Commit | Line | Data |
---|---|---|
91d76f53 | 1 | /* |
ab5be9fa MJ |
2 | * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca> |
3 | * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
91d76f53 | 4 | * |
ab5be9fa | 5 | * SPDX-License-Identifier: GPL-2.0-only |
91d76f53 | 6 | * |
91d76f53 DG |
7 | */ |
8 | ||
6c1c0768 | 9 | #define _LGPL_SOURCE |
91d76f53 | 10 | #include <errno.h> |
2463b787 | 11 | #include <fcntl.h> |
7972aab2 | 12 | #include <inttypes.h> |
91d76f53 DG |
13 | #include <pthread.h> |
14 | #include <stdio.h> | |
15 | #include <stdlib.h> | |
099e26bd | 16 | #include <string.h> |
2463b787 | 17 | #include <sys/mman.h> |
aba8e916 DG |
18 | #include <sys/stat.h> |
19 | #include <sys/types.h> | |
099e26bd | 20 | #include <unistd.h> |
0df502fd | 21 | #include <urcu/compiler.h> |
331744e3 | 22 | #include <signal.h> |
bec39940 | 23 | |
2463b787 | 24 | #include <common/bytecode/bytecode.h> |
990570ed | 25 | #include <common/common.h> |
2463b787 JR |
26 | #include <common/hashtable/utils.h> |
27 | #include <lttng/event-rule/event-rule.h> | |
28 | #include <lttng/event-rule/event-rule-internal.h> | |
29 | #include <lttng/event-rule/tracepoint.h> | |
30 | #include <lttng/condition/condition.h> | |
31 | #include <lttng/condition/event-rule-internal.h> | |
32 | #include <lttng/condition/event-rule.h> | |
33 | #include <lttng/trigger/trigger-internal.h> | |
86acf0da | 34 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 35 | |
7972aab2 | 36 | #include "buffer-registry.h" |
2463b787 | 37 | #include "condition-internal.h" |
86acf0da | 38 | #include "fd-limit.h" |
8782cc74 | 39 | #include "health-sessiond.h" |
56fff090 | 40 | #include "ust-app.h" |
48842b30 | 41 | #include "ust-consumer.h" |
75018ab6 JG |
42 | #include "lttng-ust-ctl.h" |
43 | #include "lttng-ust-error.h" | |
0b2dc8df | 44 | #include "utils.h" |
fb83fe64 | 45 | #include "session.h" |
e9404c27 JG |
46 | #include "lttng-sessiond.h" |
47 | #include "notification-thread-commands.h" | |
5c408ad8 | 48 | #include "rotate.h" |
2463b787 JR |
49 | #include "event.h" |
50 | #include "trigger-error-accounting.h" | |
51 | ||
d80a6244 | 52 | |
44cdb3a2 MJ |
53 | struct lttng_ht *ust_app_ht; |
54 | struct lttng_ht *ust_app_ht_by_sock; | |
55 | struct lttng_ht *ust_app_ht_by_notify_sock; | |
56 | ||
c4b88406 MD |
57 | static |
58 | int ust_app_flush_app_session(struct ust_app *app, struct ust_app_session *ua_sess); | |
59 | ||
d9bf3ca4 MD |
60 | /* Next available channel key. Access under next_channel_key_lock. */ |
61 | static uint64_t _next_channel_key; | |
62 | static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER; | |
63 | ||
64 | /* Next available session ID. Access under next_session_id_lock. */ | |
65 | static uint64_t _next_session_id; | |
66 | static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER; | |
ffe60014 DG |
67 | |
68 | /* | |
d9bf3ca4 | 69 | * Return the incremented value of next_channel_key. |
ffe60014 | 70 | */ |
d9bf3ca4 | 71 | static uint64_t get_next_channel_key(void) |
ffe60014 | 72 | { |
d9bf3ca4 MD |
73 | uint64_t ret; |
74 | ||
75 | pthread_mutex_lock(&next_channel_key_lock); | |
76 | ret = ++_next_channel_key; | |
77 | pthread_mutex_unlock(&next_channel_key_lock); | |
78 | return ret; | |
ffe60014 DG |
79 | } |
80 | ||
81 | /* | |
7972aab2 | 82 | * Return the atomically incremented value of next_session_id. |
ffe60014 | 83 | */ |
d9bf3ca4 | 84 | static uint64_t get_next_session_id(void) |
ffe60014 | 85 | { |
d9bf3ca4 MD |
86 | uint64_t ret; |
87 | ||
88 | pthread_mutex_lock(&next_session_id_lock); | |
89 | ret = ++_next_session_id; | |
90 | pthread_mutex_unlock(&next_session_id_lock); | |
91 | return ret; | |
ffe60014 DG |
92 | } |
93 | ||
d65d2de8 DG |
94 | static void copy_channel_attr_to_ustctl( |
95 | struct ustctl_consumer_channel_attr *attr, | |
96 | struct lttng_ust_channel_attr *uattr) | |
97 | { | |
98 | /* Copy event attributes since the layout is different. */ | |
99 | attr->subbuf_size = uattr->subbuf_size; | |
100 | attr->num_subbuf = uattr->num_subbuf; | |
101 | attr->overwrite = uattr->overwrite; | |
102 | attr->switch_timer_interval = uattr->switch_timer_interval; | |
103 | attr->read_timer_interval = uattr->read_timer_interval; | |
104 | attr->output = uattr->output; | |
491d1539 | 105 | attr->blocking_timeout = uattr->u.s.blocking_timeout; |
d65d2de8 DG |
106 | } |
107 | ||
025faf73 DG |
108 | /* |
109 | * Match function for the hash table lookup. | |
110 | * | |
111 | * It matches an ust app event based on three attributes which are the event | |
112 | * name, the filter bytecode and the loglevel. | |
113 | */ | |
18eace3b DG |
114 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
115 | { | |
116 | struct ust_app_event *event; | |
117 | const struct ust_app_ht_key *key; | |
2106efa0 | 118 | int ev_loglevel_value; |
18eace3b DG |
119 | |
120 | assert(node); | |
121 | assert(_key); | |
122 | ||
123 | event = caa_container_of(node, struct ust_app_event, node.node); | |
124 | key = _key; | |
2106efa0 | 125 | ev_loglevel_value = event->attr.loglevel; |
18eace3b | 126 | |
1af53eb5 | 127 | /* Match the 4 elements of the key: name, filter, loglevel, exclusions */ |
18eace3b DG |
128 | |
129 | /* Event name */ | |
130 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
131 | goto no_match; | |
132 | } | |
133 | ||
134 | /* Event loglevel. */ | |
2106efa0 | 135 | if (ev_loglevel_value != key->loglevel_type) { |
025faf73 | 136 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
2106efa0 PP |
137 | && key->loglevel_type == 0 && |
138 | ev_loglevel_value == -1) { | |
025faf73 DG |
139 | /* |
140 | * Match is accepted. This is because on event creation, the | |
141 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
142 | * -1 are accepted for this loglevel type since 0 is the one set by | |
143 | * the API when receiving an enable event. | |
144 | */ | |
145 | } else { | |
146 | goto no_match; | |
147 | } | |
18eace3b DG |
148 | } |
149 | ||
150 | /* One of the filters is NULL, fail. */ | |
151 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
152 | goto no_match; | |
153 | } | |
154 | ||
025faf73 DG |
155 | if (key->filter && event->filter) { |
156 | /* Both filters exists, check length followed by the bytecode. */ | |
157 | if (event->filter->len != key->filter->len || | |
158 | memcmp(event->filter->data, key->filter->data, | |
159 | event->filter->len) != 0) { | |
160 | goto no_match; | |
161 | } | |
18eace3b DG |
162 | } |
163 | ||
1af53eb5 JI |
164 | /* One of the exclusions is NULL, fail. */ |
165 | if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) { | |
166 | goto no_match; | |
167 | } | |
168 | ||
169 | if (key->exclusion && event->exclusion) { | |
170 | /* Both exclusions exists, check count followed by the names. */ | |
171 | if (event->exclusion->count != key->exclusion->count || | |
172 | memcmp(event->exclusion->names, key->exclusion->names, | |
173 | event->exclusion->count * LTTNG_UST_SYM_NAME_LEN) != 0) { | |
174 | goto no_match; | |
175 | } | |
176 | } | |
177 | ||
178 | ||
025faf73 | 179 | /* Match. */ |
18eace3b DG |
180 | return 1; |
181 | ||
182 | no_match: | |
183 | return 0; | |
18eace3b DG |
184 | } |
185 | ||
025faf73 DG |
186 | /* |
187 | * Unique add of an ust app event in the given ht. This uses the custom | |
188 | * ht_match_ust_app_event match function and the event name as hash. | |
189 | */ | |
d0b96690 | 190 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
191 | struct ust_app_event *event) |
192 | { | |
193 | struct cds_lfht_node *node_ptr; | |
194 | struct ust_app_ht_key key; | |
d0b96690 | 195 | struct lttng_ht *ht; |
18eace3b | 196 | |
d0b96690 DG |
197 | assert(ua_chan); |
198 | assert(ua_chan->events); | |
18eace3b DG |
199 | assert(event); |
200 | ||
d0b96690 | 201 | ht = ua_chan->events; |
18eace3b DG |
202 | key.name = event->attr.name; |
203 | key.filter = event->filter; | |
2106efa0 | 204 | key.loglevel_type = event->attr.loglevel; |
91c89f23 | 205 | key.exclusion = event->exclusion; |
18eace3b DG |
206 | |
207 | node_ptr = cds_lfht_add_unique(ht->ht, | |
208 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
209 | ht_match_ust_app_event, &key, &event->node.node); | |
210 | assert(node_ptr == &event->node.node); | |
211 | } | |
212 | ||
d88aee68 DG |
213 | /* |
214 | * Close the notify socket from the given RCU head object. This MUST be called | |
215 | * through a call_rcu(). | |
216 | */ | |
217 | static void close_notify_sock_rcu(struct rcu_head *head) | |
218 | { | |
219 | int ret; | |
220 | struct ust_app_notify_sock_obj *obj = | |
221 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
222 | ||
223 | /* Must have a valid fd here. */ | |
224 | assert(obj->fd >= 0); | |
225 | ||
226 | ret = close(obj->fd); | |
227 | if (ret) { | |
228 | ERR("close notify sock %d RCU", obj->fd); | |
229 | } | |
230 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
231 | ||
232 | free(obj); | |
233 | } | |
234 | ||
7972aab2 DG |
235 | /* |
236 | * Return the session registry according to the buffer type of the given | |
237 | * session. | |
238 | * | |
239 | * A registry per UID object MUST exists before calling this function or else | |
240 | * it assert() if not found. RCU read side lock must be acquired. | |
241 | */ | |
242 | static struct ust_registry_session *get_session_registry( | |
243 | struct ust_app_session *ua_sess) | |
244 | { | |
245 | struct ust_registry_session *registry = NULL; | |
246 | ||
247 | assert(ua_sess); | |
248 | ||
249 | switch (ua_sess->buffer_type) { | |
250 | case LTTNG_BUFFER_PER_PID: | |
251 | { | |
252 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
253 | if (!reg_pid) { | |
254 | goto error; | |
255 | } | |
256 | registry = reg_pid->registry->reg.ust; | |
257 | break; | |
258 | } | |
259 | case LTTNG_BUFFER_PER_UID: | |
260 | { | |
261 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
470cc211 | 262 | ua_sess->tracing_id, ua_sess->bits_per_long, |
2463b787 | 263 | lttng_credentials_get_uid(&ua_sess->real_credentials)); |
7972aab2 DG |
264 | if (!reg_uid) { |
265 | goto error; | |
266 | } | |
267 | registry = reg_uid->registry->reg.ust; | |
268 | break; | |
269 | } | |
270 | default: | |
271 | assert(0); | |
272 | }; | |
273 | ||
274 | error: | |
275 | return registry; | |
276 | } | |
277 | ||
55cc08a6 DG |
278 | /* |
279 | * Delete ust context safely. RCU read lock must be held before calling | |
280 | * this function. | |
281 | */ | |
282 | static | |
fb45065e MD |
283 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx, |
284 | struct ust_app *app) | |
55cc08a6 | 285 | { |
ffe60014 DG |
286 | int ret; |
287 | ||
288 | assert(ua_ctx); | |
289 | ||
55cc08a6 | 290 | if (ua_ctx->obj) { |
fb45065e | 291 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 292 | ret = ustctl_release_object(sock, ua_ctx->obj); |
fb45065e | 293 | pthread_mutex_unlock(&app->sock_lock); |
d0b96690 DG |
294 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
295 | ERR("UST app sock %d release ctx obj handle %d failed with ret %d", | |
296 | sock, ua_ctx->obj->handle, ret); | |
ffe60014 | 297 | } |
55cc08a6 DG |
298 | free(ua_ctx->obj); |
299 | } | |
300 | free(ua_ctx); | |
301 | } | |
302 | ||
d80a6244 DG |
303 | /* |
304 | * Delete ust app event safely. RCU read lock must be held before calling | |
305 | * this function. | |
306 | */ | |
8b366481 | 307 | static |
fb45065e MD |
308 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event, |
309 | struct ust_app *app) | |
d80a6244 | 310 | { |
ffe60014 DG |
311 | int ret; |
312 | ||
313 | assert(ua_event); | |
314 | ||
53a80697 | 315 | free(ua_event->filter); |
951f0b71 JI |
316 | if (ua_event->exclusion != NULL) |
317 | free(ua_event->exclusion); | |
edb67388 | 318 | if (ua_event->obj != NULL) { |
fb45065e | 319 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 320 | ret = ustctl_release_object(sock, ua_event->obj); |
fb45065e | 321 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
322 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
323 | ERR("UST app sock %d release event obj failed with ret %d", | |
324 | sock, ret); | |
325 | } | |
edb67388 DG |
326 | free(ua_event->obj); |
327 | } | |
d80a6244 DG |
328 | free(ua_event); |
329 | } | |
330 | ||
2463b787 JR |
331 | /* |
332 | * Delete ust app token event_rule safely. RCU read lock must be held before calling | |
333 | * this function. TODO: or does it???? | |
334 | */ | |
335 | static | |
336 | void delete_ust_app_token_event_rule(int sock, struct ust_app_token_event_rule *ua_token, | |
337 | struct ust_app *app) | |
338 | { | |
339 | int ret; | |
340 | ||
341 | assert(ua_token); | |
342 | ||
343 | if (ua_token->exclusion != NULL) | |
344 | free(ua_token->exclusion); | |
345 | if (ua_token->obj != NULL) { | |
346 | pthread_mutex_lock(&app->sock_lock); | |
347 | ret = ustctl_release_object(sock, ua_token->obj); | |
348 | pthread_mutex_unlock(&app->sock_lock); | |
349 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
350 | ERR("UST app sock %d release event obj failed with ret %d", | |
351 | sock, ret); | |
352 | } | |
353 | free(ua_token->obj); | |
354 | } | |
355 | lttng_trigger_put(ua_token->trigger); | |
356 | free(ua_token); | |
357 | } | |
358 | ||
d80a6244 | 359 | /* |
7972aab2 DG |
360 | * Release ust data object of the given stream. |
361 | * | |
362 | * Return 0 on success or else a negative value. | |
d80a6244 | 363 | */ |
fb45065e MD |
364 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream, |
365 | struct ust_app *app) | |
d80a6244 | 366 | { |
7972aab2 | 367 | int ret = 0; |
ffe60014 DG |
368 | |
369 | assert(stream); | |
370 | ||
8b366481 | 371 | if (stream->obj) { |
fb45065e | 372 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 373 | ret = ustctl_release_object(sock, stream->obj); |
fb45065e | 374 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
375 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
376 | ERR("UST app sock %d release stream obj failed with ret %d", | |
377 | sock, ret); | |
378 | } | |
4063050c | 379 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
380 | free(stream->obj); |
381 | } | |
7972aab2 DG |
382 | |
383 | return ret; | |
384 | } | |
385 | ||
386 | /* | |
387 | * Delete ust app stream safely. RCU read lock must be held before calling | |
388 | * this function. | |
389 | */ | |
390 | static | |
fb45065e MD |
391 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream, |
392 | struct ust_app *app) | |
7972aab2 DG |
393 | { |
394 | assert(stream); | |
395 | ||
fb45065e | 396 | (void) release_ust_app_stream(sock, stream, app); |
84cd17c6 | 397 | free(stream); |
d80a6244 DG |
398 | } |
399 | ||
36b588ed MD |
400 | /* |
401 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
402 | * section and outside of call_rcu thread, so we postpone its execution |
403 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
404 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
405 | */ |
406 | static | |
407 | void delete_ust_app_channel_rcu(struct rcu_head *head) | |
408 | { | |
409 | struct ust_app_channel *ua_chan = | |
410 | caa_container_of(head, struct ust_app_channel, rcu_head); | |
411 | ||
0b2dc8df MD |
412 | ht_cleanup_push(ua_chan->ctx); |
413 | ht_cleanup_push(ua_chan->events); | |
36b588ed MD |
414 | free(ua_chan); |
415 | } | |
416 | ||
fb83fe64 JD |
417 | /* |
418 | * Extract the lost packet or discarded events counter when the channel is | |
419 | * being deleted and store the value in the parent channel so we can | |
420 | * access it from lttng list and at stop/destroy. | |
82cac6d2 JG |
421 | * |
422 | * The session list lock must be held by the caller. | |
fb83fe64 JD |
423 | */ |
424 | static | |
425 | void save_per_pid_lost_discarded_counters(struct ust_app_channel *ua_chan) | |
426 | { | |
427 | uint64_t discarded = 0, lost = 0; | |
428 | struct ltt_session *session; | |
429 | struct ltt_ust_channel *uchan; | |
430 | ||
431 | if (ua_chan->attr.type != LTTNG_UST_CHAN_PER_CPU) { | |
432 | return; | |
433 | } | |
434 | ||
435 | rcu_read_lock(); | |
436 | session = session_find_by_id(ua_chan->session->tracing_id); | |
d68ec974 JG |
437 | if (!session || !session->ust_session) { |
438 | /* | |
439 | * Not finding the session is not an error because there are | |
440 | * multiple ways the channels can be torn down. | |
441 | * | |
442 | * 1) The session daemon can initiate the destruction of the | |
443 | * ust app session after receiving a destroy command or | |
444 | * during its shutdown/teardown. | |
445 | * 2) The application, since we are in per-pid tracing, is | |
446 | * unregistering and tearing down its ust app session. | |
447 | * | |
448 | * Both paths are protected by the session list lock which | |
449 | * ensures that the accounting of lost packets and discarded | |
450 | * events is done exactly once. The session is then unpublished | |
451 | * from the session list, resulting in this condition. | |
452 | */ | |
fb83fe64 JD |
453 | goto end; |
454 | } | |
455 | ||
456 | if (ua_chan->attr.overwrite) { | |
457 | consumer_get_lost_packets(ua_chan->session->tracing_id, | |
458 | ua_chan->key, session->ust_session->consumer, | |
459 | &lost); | |
460 | } else { | |
461 | consumer_get_discarded_events(ua_chan->session->tracing_id, | |
462 | ua_chan->key, session->ust_session->consumer, | |
463 | &discarded); | |
464 | } | |
465 | uchan = trace_ust_find_channel_by_name( | |
466 | session->ust_session->domain_global.channels, | |
467 | ua_chan->name); | |
468 | if (!uchan) { | |
469 | ERR("Missing UST channel to store discarded counters"); | |
470 | goto end; | |
471 | } | |
472 | ||
473 | uchan->per_pid_closed_app_discarded += discarded; | |
474 | uchan->per_pid_closed_app_lost += lost; | |
475 | ||
476 | end: | |
477 | rcu_read_unlock(); | |
e32d7f27 JG |
478 | if (session) { |
479 | session_put(session); | |
480 | } | |
fb83fe64 JD |
481 | } |
482 | ||
d80a6244 DG |
483 | /* |
484 | * Delete ust app channel safely. RCU read lock must be held before calling | |
485 | * this function. | |
82cac6d2 JG |
486 | * |
487 | * The session list lock must be held by the caller. | |
d80a6244 | 488 | */ |
8b366481 | 489 | static |
d0b96690 DG |
490 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
491 | struct ust_app *app) | |
d80a6244 DG |
492 | { |
493 | int ret; | |
bec39940 | 494 | struct lttng_ht_iter iter; |
d80a6244 | 495 | struct ust_app_event *ua_event; |
55cc08a6 | 496 | struct ust_app_ctx *ua_ctx; |
030a66fa | 497 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 498 | struct ust_registry_session *registry; |
d80a6244 | 499 | |
ffe60014 DG |
500 | assert(ua_chan); |
501 | ||
502 | DBG3("UST app deleting channel %s", ua_chan->name); | |
503 | ||
55cc08a6 | 504 | /* Wipe stream */ |
d80a6244 | 505 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 506 | cds_list_del(&stream->list); |
fb45065e | 507 | delete_ust_app_stream(sock, stream, app); |
d80a6244 DG |
508 | } |
509 | ||
55cc08a6 | 510 | /* Wipe context */ |
bec39940 | 511 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
31746f93 | 512 | cds_list_del(&ua_ctx->list); |
bec39940 | 513 | ret = lttng_ht_del(ua_chan->ctx, &iter); |
55cc08a6 | 514 | assert(!ret); |
fb45065e | 515 | delete_ust_app_ctx(sock, ua_ctx, app); |
55cc08a6 | 516 | } |
d80a6244 | 517 | |
55cc08a6 | 518 | /* Wipe events */ |
bec39940 DG |
519 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
520 | node.node) { | |
521 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 522 | assert(!ret); |
fb45065e | 523 | delete_ust_app_event(sock, ua_event, app); |
d80a6244 | 524 | } |
edb67388 | 525 | |
c8335706 MD |
526 | if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) { |
527 | /* Wipe and free registry from session registry. */ | |
528 | registry = get_session_registry(ua_chan->session); | |
529 | if (registry) { | |
e9404c27 | 530 | ust_registry_channel_del_free(registry, ua_chan->key, |
e38d96f9 MD |
531 | sock >= 0); |
532 | } | |
45798a31 JG |
533 | /* |
534 | * A negative socket can be used by the caller when | |
535 | * cleaning-up a ua_chan in an error path. Skip the | |
536 | * accounting in this case. | |
537 | */ | |
e38d96f9 MD |
538 | if (sock >= 0) { |
539 | save_per_pid_lost_discarded_counters(ua_chan); | |
c8335706 | 540 | } |
7972aab2 | 541 | } |
d0b96690 | 542 | |
edb67388 | 543 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
544 | /* Remove channel from application UST object descriptor. */ |
545 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
c6e62271 DG |
546 | ret = lttng_ht_del(app->ust_objd, &iter); |
547 | assert(!ret); | |
fb45065e | 548 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 549 | ret = ustctl_release_object(sock, ua_chan->obj); |
fb45065e | 550 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
551 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
552 | ERR("UST app sock %d release channel obj failed with ret %d", | |
553 | sock, ret); | |
554 | } | |
7972aab2 | 555 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
556 | free(ua_chan->obj); |
557 | } | |
36b588ed | 558 | call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); |
d80a6244 DG |
559 | } |
560 | ||
fb45065e MD |
561 | int ust_app_register_done(struct ust_app *app) |
562 | { | |
563 | int ret; | |
564 | ||
565 | pthread_mutex_lock(&app->sock_lock); | |
566 | ret = ustctl_register_done(app->sock); | |
567 | pthread_mutex_unlock(&app->sock_lock); | |
568 | return ret; | |
569 | } | |
570 | ||
571 | int ust_app_release_object(struct ust_app *app, struct lttng_ust_object_data *data) | |
572 | { | |
573 | int ret, sock; | |
574 | ||
575 | if (app) { | |
576 | pthread_mutex_lock(&app->sock_lock); | |
577 | sock = app->sock; | |
578 | } else { | |
579 | sock = -1; | |
580 | } | |
581 | ret = ustctl_release_object(sock, data); | |
582 | if (app) { | |
583 | pthread_mutex_unlock(&app->sock_lock); | |
584 | } | |
585 | return ret; | |
586 | } | |
587 | ||
331744e3 | 588 | /* |
1b532a60 DG |
589 | * Push metadata to consumer socket. |
590 | * | |
dc2bbdae MD |
591 | * RCU read-side lock must be held to guarantee existance of socket. |
592 | * Must be called with the ust app session lock held. | |
593 | * Must be called with the registry lock held. | |
331744e3 JD |
594 | * |
595 | * On success, return the len of metadata pushed or else a negative value. | |
2c57e06d MD |
596 | * Returning a -EPIPE return value means we could not send the metadata, |
597 | * but it can be caused by recoverable errors (e.g. the application has | |
598 | * terminated concurrently). | |
331744e3 JD |
599 | */ |
600 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
601 | struct consumer_socket *socket, int send_zero_data) | |
602 | { | |
603 | int ret; | |
604 | char *metadata_str = NULL; | |
c585821b | 605 | size_t len, offset, new_metadata_len_sent; |
331744e3 | 606 | ssize_t ret_val; |
93ec662e | 607 | uint64_t metadata_key, metadata_version; |
331744e3 JD |
608 | |
609 | assert(registry); | |
610 | assert(socket); | |
1b532a60 | 611 | |
c585821b MD |
612 | metadata_key = registry->metadata_key; |
613 | ||
ce34fcd0 | 614 | /* |
dc2bbdae MD |
615 | * Means that no metadata was assigned to the session. This can |
616 | * happens if no start has been done previously. | |
ce34fcd0 | 617 | */ |
c585821b | 618 | if (!metadata_key) { |
ce34fcd0 MD |
619 | return 0; |
620 | } | |
621 | ||
331744e3 JD |
622 | offset = registry->metadata_len_sent; |
623 | len = registry->metadata_len - registry->metadata_len_sent; | |
c585821b | 624 | new_metadata_len_sent = registry->metadata_len; |
93ec662e | 625 | metadata_version = registry->metadata_version; |
331744e3 JD |
626 | if (len == 0) { |
627 | DBG3("No metadata to push for metadata key %" PRIu64, | |
628 | registry->metadata_key); | |
629 | ret_val = len; | |
630 | if (send_zero_data) { | |
631 | DBG("No metadata to push"); | |
632 | goto push_data; | |
633 | } | |
634 | goto end; | |
635 | } | |
636 | ||
637 | /* Allocate only what we have to send. */ | |
638 | metadata_str = zmalloc(len); | |
639 | if (!metadata_str) { | |
640 | PERROR("zmalloc ust app metadata string"); | |
641 | ret_val = -ENOMEM; | |
642 | goto error; | |
643 | } | |
c585821b | 644 | /* Copy what we haven't sent out. */ |
331744e3 | 645 | memcpy(metadata_str, registry->metadata + offset, len); |
331744e3 JD |
646 | |
647 | push_data: | |
c585821b MD |
648 | pthread_mutex_unlock(®istry->lock); |
649 | /* | |
650 | * We need to unlock the registry while we push metadata to | |
651 | * break a circular dependency between the consumerd metadata | |
652 | * lock and the sessiond registry lock. Indeed, pushing metadata | |
653 | * to the consumerd awaits that it gets pushed all the way to | |
654 | * relayd, but doing so requires grabbing the metadata lock. If | |
655 | * a concurrent metadata request is being performed by | |
656 | * consumerd, this can try to grab the registry lock on the | |
657 | * sessiond while holding the metadata lock on the consumer | |
658 | * daemon. Those push and pull schemes are performed on two | |
659 | * different bidirectionnal communication sockets. | |
660 | */ | |
661 | ret = consumer_push_metadata(socket, metadata_key, | |
93ec662e | 662 | metadata_str, len, offset, metadata_version); |
c585821b | 663 | pthread_mutex_lock(®istry->lock); |
331744e3 | 664 | if (ret < 0) { |
000baf6a | 665 | /* |
dc2bbdae MD |
666 | * There is an acceptable race here between the registry |
667 | * metadata key assignment and the creation on the | |
668 | * consumer. The session daemon can concurrently push | |
669 | * metadata for this registry while being created on the | |
670 | * consumer since the metadata key of the registry is | |
671 | * assigned *before* it is setup to avoid the consumer | |
672 | * to ask for metadata that could possibly be not found | |
673 | * in the session daemon. | |
000baf6a | 674 | * |
dc2bbdae MD |
675 | * The metadata will get pushed either by the session |
676 | * being stopped or the consumer requesting metadata if | |
677 | * that race is triggered. | |
000baf6a DG |
678 | */ |
679 | if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) { | |
680 | ret = 0; | |
c585821b MD |
681 | } else { |
682 | ERR("Error pushing metadata to consumer"); | |
000baf6a | 683 | } |
331744e3 JD |
684 | ret_val = ret; |
685 | goto error_push; | |
c585821b MD |
686 | } else { |
687 | /* | |
688 | * Metadata may have been concurrently pushed, since | |
689 | * we're not holding the registry lock while pushing to | |
690 | * consumer. This is handled by the fact that we send | |
691 | * the metadata content, size, and the offset at which | |
692 | * that metadata belongs. This may arrive out of order | |
693 | * on the consumer side, and the consumer is able to | |
694 | * deal with overlapping fragments. The consumer | |
695 | * supports overlapping fragments, which must be | |
696 | * contiguous starting from offset 0. We keep the | |
697 | * largest metadata_len_sent value of the concurrent | |
698 | * send. | |
699 | */ | |
700 | registry->metadata_len_sent = | |
701 | max_t(size_t, registry->metadata_len_sent, | |
702 | new_metadata_len_sent); | |
331744e3 | 703 | } |
331744e3 JD |
704 | free(metadata_str); |
705 | return len; | |
706 | ||
707 | end: | |
708 | error: | |
ce34fcd0 MD |
709 | if (ret_val) { |
710 | /* | |
dc2bbdae MD |
711 | * On error, flag the registry that the metadata is |
712 | * closed. We were unable to push anything and this | |
713 | * means that either the consumer is not responding or | |
714 | * the metadata cache has been destroyed on the | |
715 | * consumer. | |
ce34fcd0 MD |
716 | */ |
717 | registry->metadata_closed = 1; | |
718 | } | |
331744e3 JD |
719 | error_push: |
720 | free(metadata_str); | |
721 | return ret_val; | |
722 | } | |
723 | ||
d88aee68 | 724 | /* |
ce34fcd0 | 725 | * For a given application and session, push metadata to consumer. |
331744e3 JD |
726 | * Either sock or consumer is required : if sock is NULL, the default |
727 | * socket to send the metadata is retrieved from consumer, if sock | |
728 | * is not NULL we use it to send the metadata. | |
ce34fcd0 | 729 | * RCU read-side lock must be held while calling this function, |
dc2bbdae MD |
730 | * therefore ensuring existance of registry. It also ensures existance |
731 | * of socket throughout this function. | |
d88aee68 DG |
732 | * |
733 | * Return 0 on success else a negative error. | |
2c57e06d MD |
734 | * Returning a -EPIPE return value means we could not send the metadata, |
735 | * but it can be caused by recoverable errors (e.g. the application has | |
736 | * terminated concurrently). | |
d88aee68 | 737 | */ |
7972aab2 DG |
738 | static int push_metadata(struct ust_registry_session *registry, |
739 | struct consumer_output *consumer) | |
d88aee68 | 740 | { |
331744e3 JD |
741 | int ret_val; |
742 | ssize_t ret; | |
d88aee68 DG |
743 | struct consumer_socket *socket; |
744 | ||
7972aab2 DG |
745 | assert(registry); |
746 | assert(consumer); | |
747 | ||
ce34fcd0 | 748 | pthread_mutex_lock(®istry->lock); |
ce34fcd0 | 749 | if (registry->metadata_closed) { |
dc2bbdae MD |
750 | ret_val = -EPIPE; |
751 | goto error; | |
d88aee68 DG |
752 | } |
753 | ||
d88aee68 | 754 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
755 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
756 | consumer); | |
d88aee68 | 757 | if (!socket) { |
331744e3 | 758 | ret_val = -1; |
ce34fcd0 | 759 | goto error; |
d88aee68 DG |
760 | } |
761 | ||
331744e3 | 762 | ret = ust_app_push_metadata(registry, socket, 0); |
d88aee68 | 763 | if (ret < 0) { |
331744e3 | 764 | ret_val = ret; |
ce34fcd0 | 765 | goto error; |
d88aee68 | 766 | } |
dc2bbdae | 767 | pthread_mutex_unlock(®istry->lock); |
d88aee68 DG |
768 | return 0; |
769 | ||
ce34fcd0 | 770 | error: |
dc2bbdae | 771 | pthread_mutex_unlock(®istry->lock); |
331744e3 | 772 | return ret_val; |
d88aee68 DG |
773 | } |
774 | ||
775 | /* | |
776 | * Send to the consumer a close metadata command for the given session. Once | |
777 | * done, the metadata channel is deleted and the session metadata pointer is | |
dc2bbdae | 778 | * nullified. The session lock MUST be held unless the application is |
d88aee68 DG |
779 | * in the destroy path. |
780 | * | |
a70ac2f4 MD |
781 | * Do not hold the registry lock while communicating with the consumerd, because |
782 | * doing so causes inter-process deadlocks between consumerd and sessiond with | |
783 | * the metadata request notification. | |
784 | * | |
d88aee68 DG |
785 | * Return 0 on success else a negative value. |
786 | */ | |
7972aab2 DG |
787 | static int close_metadata(struct ust_registry_session *registry, |
788 | struct consumer_output *consumer) | |
d88aee68 DG |
789 | { |
790 | int ret; | |
791 | struct consumer_socket *socket; | |
a70ac2f4 MD |
792 | uint64_t metadata_key; |
793 | bool registry_was_already_closed; | |
d88aee68 | 794 | |
7972aab2 DG |
795 | assert(registry); |
796 | assert(consumer); | |
d88aee68 | 797 | |
7972aab2 DG |
798 | rcu_read_lock(); |
799 | ||
ce34fcd0 | 800 | pthread_mutex_lock(®istry->lock); |
a70ac2f4 MD |
801 | metadata_key = registry->metadata_key; |
802 | registry_was_already_closed = registry->metadata_closed; | |
803 | if (metadata_key != 0) { | |
804 | /* | |
805 | * Metadata closed. Even on error this means that the consumer | |
806 | * is not responding or not found so either way a second close | |
807 | * should NOT be emit for this registry. | |
808 | */ | |
809 | registry->metadata_closed = 1; | |
810 | } | |
811 | pthread_mutex_unlock(®istry->lock); | |
ce34fcd0 | 812 | |
a70ac2f4 | 813 | if (metadata_key == 0 || registry_was_already_closed) { |
d88aee68 | 814 | ret = 0; |
1b532a60 | 815 | goto end; |
d88aee68 DG |
816 | } |
817 | ||
d88aee68 | 818 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
819 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
820 | consumer); | |
d88aee68 DG |
821 | if (!socket) { |
822 | ret = -1; | |
a70ac2f4 | 823 | goto end; |
d88aee68 DG |
824 | } |
825 | ||
a70ac2f4 | 826 | ret = consumer_close_metadata(socket, metadata_key); |
d88aee68 | 827 | if (ret < 0) { |
a70ac2f4 | 828 | goto end; |
d88aee68 DG |
829 | } |
830 | ||
1b532a60 | 831 | end: |
7972aab2 | 832 | rcu_read_unlock(); |
d88aee68 DG |
833 | return ret; |
834 | } | |
835 | ||
36b588ed MD |
836 | /* |
837 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
838 | * section and outside of call_rcu thread, so we postpone its execution |
839 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
840 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
841 | */ |
842 | static | |
843 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
844 | { | |
845 | struct ust_app_session *ua_sess = | |
846 | caa_container_of(head, struct ust_app_session, rcu_head); | |
847 | ||
0b2dc8df | 848 | ht_cleanup_push(ua_sess->channels); |
36b588ed MD |
849 | free(ua_sess); |
850 | } | |
851 | ||
d80a6244 DG |
852 | /* |
853 | * Delete ust app session safely. RCU read lock must be held before calling | |
854 | * this function. | |
82cac6d2 JG |
855 | * |
856 | * The session list lock must be held by the caller. | |
d80a6244 | 857 | */ |
8b366481 | 858 | static |
d0b96690 DG |
859 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
860 | struct ust_app *app) | |
d80a6244 DG |
861 | { |
862 | int ret; | |
bec39940 | 863 | struct lttng_ht_iter iter; |
d80a6244 | 864 | struct ust_app_channel *ua_chan; |
7972aab2 | 865 | struct ust_registry_session *registry; |
d80a6244 | 866 | |
d88aee68 DG |
867 | assert(ua_sess); |
868 | ||
1b532a60 DG |
869 | pthread_mutex_lock(&ua_sess->lock); |
870 | ||
b161602a MD |
871 | assert(!ua_sess->deleted); |
872 | ua_sess->deleted = true; | |
873 | ||
7972aab2 | 874 | registry = get_session_registry(ua_sess); |
fad1ed2f | 875 | /* Registry can be null on error path during initialization. */ |
ce34fcd0 | 876 | if (registry) { |
d88aee68 | 877 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 878 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 879 | |
7972aab2 DG |
880 | /* |
881 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
882 | * metadata only on destroy trace session in this case. Also, the |
883 | * previous push metadata could have flag the metadata registry to | |
884 | * close so don't send a close command if closed. | |
7972aab2 | 885 | */ |
ce34fcd0 | 886 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
887 | /* And ask to close it for this session registry. */ |
888 | (void) close_metadata(registry, ua_sess->consumer); | |
889 | } | |
d80a6244 DG |
890 | } |
891 | ||
bec39940 DG |
892 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
893 | node.node) { | |
894 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 895 | assert(!ret); |
d0b96690 | 896 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 897 | } |
d80a6244 | 898 | |
7972aab2 DG |
899 | /* In case of per PID, the registry is kept in the session. */ |
900 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
901 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
902 | if (reg_pid) { | |
fad1ed2f JR |
903 | /* |
904 | * Registry can be null on error path during | |
905 | * initialization. | |
906 | */ | |
7972aab2 DG |
907 | buffer_reg_pid_remove(reg_pid); |
908 | buffer_reg_pid_destroy(reg_pid); | |
909 | } | |
910 | } | |
d0b96690 | 911 | |
aee6bafd | 912 | if (ua_sess->handle != -1) { |
fb45065e | 913 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 914 | ret = ustctl_release_handle(sock, ua_sess->handle); |
fb45065e | 915 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
916 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
917 | ERR("UST app sock %d release session handle failed with ret %d", | |
918 | sock, ret); | |
919 | } | |
10b56aef MD |
920 | /* Remove session from application UST object descriptor. */ |
921 | iter.iter.node = &ua_sess->ust_objd_node.node; | |
922 | ret = lttng_ht_del(app->ust_sessions_objd, &iter); | |
923 | assert(!ret); | |
aee6bafd | 924 | } |
10b56aef | 925 | |
1b532a60 DG |
926 | pthread_mutex_unlock(&ua_sess->lock); |
927 | ||
6addfa37 MD |
928 | consumer_output_put(ua_sess->consumer); |
929 | ||
36b588ed | 930 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 931 | } |
91d76f53 DG |
932 | |
933 | /* | |
284d8f55 DG |
934 | * Delete a traceable application structure from the global list. Never call |
935 | * this function outside of a call_rcu call. | |
36b588ed MD |
936 | * |
937 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 938 | */ |
8b366481 DG |
939 | static |
940 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 941 | { |
8b366481 | 942 | int ret, sock; |
d42f20df | 943 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
2463b787 JR |
944 | struct lttng_ht_iter iter; |
945 | struct ust_app_token_event_rule *token; | |
44d3bd01 | 946 | |
82cac6d2 JG |
947 | /* |
948 | * The session list lock must be held during this function to guarantee | |
949 | * the existence of ua_sess. | |
950 | */ | |
951 | session_lock_list(); | |
d80a6244 | 952 | /* Delete ust app sessions info */ |
852d0037 DG |
953 | sock = app->sock; |
954 | app->sock = -1; | |
d80a6244 | 955 | |
8b366481 | 956 | /* Wipe sessions */ |
d42f20df DG |
957 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
958 | teardown_node) { | |
959 | /* Free every object in the session and the session. */ | |
36b588ed | 960 | rcu_read_lock(); |
d0b96690 | 961 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 962 | rcu_read_unlock(); |
d80a6244 | 963 | } |
36b588ed | 964 | |
2463b787 JR |
965 | /* Wipe token associated with the app */ |
966 | cds_lfht_for_each_entry(app->tokens_ht->ht, &iter.iter, token, | |
967 | node.node) { | |
968 | ret = lttng_ht_del(app->tokens_ht, &iter); | |
969 | assert(!ret); | |
970 | delete_ust_app_token_event_rule(app->sock, token, app); | |
971 | } | |
972 | ||
0b2dc8df | 973 | ht_cleanup_push(app->sessions); |
10b56aef | 974 | ht_cleanup_push(app->ust_sessions_objd); |
0b2dc8df | 975 | ht_cleanup_push(app->ust_objd); |
2463b787 JR |
976 | ht_cleanup_push(app->tokens_ht); |
977 | ||
978 | /* This can happen if trigger setup failed. e.g killed app */ | |
979 | if (app->token_communication.handle) { | |
980 | ustctl_release_object(sock, app->token_communication.handle); | |
981 | free(app->token_communication.handle); | |
982 | } | |
983 | ||
984 | lttng_pipe_destroy(app->token_communication.trigger_event_pipe); | |
d80a6244 | 985 | |
6414a713 | 986 | /* |
852d0037 DG |
987 | * Wait until we have deleted the application from the sock hash table |
988 | * before closing this socket, otherwise an application could re-use the | |
989 | * socket ID and race with the teardown, using the same hash table entry. | |
990 | * | |
991 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
992 | * all RCU readers that could run concurrently with unregister app, | |
993 | * therefore we _need_ to only close that socket after a grace period. So | |
994 | * it should stay in this RCU callback. | |
995 | * | |
996 | * This close() is a very important step of the synchronization model so | |
997 | * every modification to this function must be carefully reviewed. | |
6414a713 | 998 | */ |
799e2c4f MD |
999 | ret = close(sock); |
1000 | if (ret) { | |
1001 | PERROR("close"); | |
1002 | } | |
4063050c | 1003 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 1004 | |
852d0037 | 1005 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 1006 | free(app); |
82cac6d2 | 1007 | session_unlock_list(); |
099e26bd DG |
1008 | } |
1009 | ||
1010 | /* | |
f6a9efaa | 1011 | * URCU intermediate call to delete an UST app. |
099e26bd | 1012 | */ |
8b366481 DG |
1013 | static |
1014 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 1015 | { |
bec39940 DG |
1016 | struct lttng_ht_node_ulong *node = |
1017 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 1018 | struct ust_app *app = |
852d0037 | 1019 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 1020 | |
852d0037 | 1021 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 1022 | delete_ust_app(app); |
099e26bd DG |
1023 | } |
1024 | ||
ffe60014 DG |
1025 | /* |
1026 | * Delete the session from the application ht and delete the data structure by | |
1027 | * freeing every object inside and releasing them. | |
82cac6d2 JG |
1028 | * |
1029 | * The session list lock must be held by the caller. | |
ffe60014 | 1030 | */ |
d0b96690 | 1031 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
1032 | struct ust_app_session *ua_sess) |
1033 | { | |
1034 | int ret; | |
1035 | struct lttng_ht_iter iter; | |
1036 | ||
1037 | assert(app); | |
1038 | assert(ua_sess); | |
1039 | ||
1040 | iter.iter.node = &ua_sess->node.node; | |
1041 | ret = lttng_ht_del(app->sessions, &iter); | |
1042 | if (ret) { | |
1043 | /* Already scheduled for teardown. */ | |
1044 | goto end; | |
1045 | } | |
1046 | ||
1047 | /* Once deleted, free the data structure. */ | |
d0b96690 | 1048 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
1049 | |
1050 | end: | |
1051 | return; | |
1052 | } | |
1053 | ||
8b366481 DG |
1054 | /* |
1055 | * Alloc new UST app session. | |
1056 | */ | |
1057 | static | |
40bbd087 | 1058 | struct ust_app_session *alloc_ust_app_session(void) |
8b366481 DG |
1059 | { |
1060 | struct ust_app_session *ua_sess; | |
1061 | ||
1062 | /* Init most of the default value by allocating and zeroing */ | |
1063 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
1064 | if (ua_sess == NULL) { | |
1065 | PERROR("malloc"); | |
ffe60014 | 1066 | goto error_free; |
8b366481 DG |
1067 | } |
1068 | ||
1069 | ua_sess->handle = -1; | |
bec39940 | 1070 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
ad7a9107 | 1071 | ua_sess->metadata_attr.type = LTTNG_UST_CHAN_METADATA; |
84ad93e8 | 1072 | pthread_mutex_init(&ua_sess->lock, NULL); |
ad7a9107 | 1073 | |
8b366481 DG |
1074 | return ua_sess; |
1075 | ||
ffe60014 | 1076 | error_free: |
8b366481 DG |
1077 | return NULL; |
1078 | } | |
1079 | ||
1080 | /* | |
1081 | * Alloc new UST app channel. | |
1082 | */ | |
1083 | static | |
b53d4e59 | 1084 | struct ust_app_channel *alloc_ust_app_channel(const char *name, |
d0b96690 | 1085 | struct ust_app_session *ua_sess, |
ffe60014 | 1086 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
1087 | { |
1088 | struct ust_app_channel *ua_chan; | |
1089 | ||
1090 | /* Init most of the default value by allocating and zeroing */ | |
1091 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
1092 | if (ua_chan == NULL) { | |
1093 | PERROR("malloc"); | |
1094 | goto error; | |
1095 | } | |
1096 | ||
1097 | /* Setup channel name */ | |
1098 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
1099 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
1100 | ||
1101 | ua_chan->enabled = 1; | |
1102 | ua_chan->handle = -1; | |
45893984 | 1103 | ua_chan->session = ua_sess; |
ffe60014 | 1104 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
1105 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
1106 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
1107 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
1108 | |
1109 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
31746f93 | 1110 | CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); |
8b366481 DG |
1111 | |
1112 | /* Copy attributes */ | |
1113 | if (attr) { | |
ffe60014 | 1114 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
1115 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
1116 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
1117 | ua_chan->attr.overwrite = attr->overwrite; | |
1118 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
1119 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
1120 | ua_chan->attr.output = attr->output; | |
491d1539 | 1121 | ua_chan->attr.blocking_timeout = attr->u.s.blocking_timeout; |
8b366481 | 1122 | } |
ffe60014 DG |
1123 | /* By default, the channel is a per cpu channel. */ |
1124 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
1125 | |
1126 | DBG3("UST app channel %s allocated", ua_chan->name); | |
1127 | ||
1128 | return ua_chan; | |
1129 | ||
1130 | error: | |
1131 | return NULL; | |
1132 | } | |
1133 | ||
37f1c236 DG |
1134 | /* |
1135 | * Allocate and initialize a UST app stream. | |
1136 | * | |
1137 | * Return newly allocated stream pointer or NULL on error. | |
1138 | */ | |
ffe60014 | 1139 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
1140 | { |
1141 | struct ust_app_stream *stream = NULL; | |
1142 | ||
1143 | stream = zmalloc(sizeof(*stream)); | |
1144 | if (stream == NULL) { | |
1145 | PERROR("zmalloc ust app stream"); | |
1146 | goto error; | |
1147 | } | |
1148 | ||
1149 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
1150 | stream->handle = -1; | |
1151 | ||
1152 | error: | |
1153 | return stream; | |
1154 | } | |
1155 | ||
8b366481 DG |
1156 | /* |
1157 | * Alloc new UST app event. | |
1158 | */ | |
1159 | static | |
1160 | struct ust_app_event *alloc_ust_app_event(char *name, | |
1161 | struct lttng_ust_event *attr) | |
1162 | { | |
1163 | struct ust_app_event *ua_event; | |
1164 | ||
1165 | /* Init most of the default value by allocating and zeroing */ | |
1166 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
1167 | if (ua_event == NULL) { | |
20533947 | 1168 | PERROR("Failed to allocate ust_app_event structure"); |
8b366481 DG |
1169 | goto error; |
1170 | } | |
1171 | ||
1172 | ua_event->enabled = 1; | |
1173 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
1174 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 1175 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
1176 | |
1177 | /* Copy attributes */ | |
1178 | if (attr) { | |
1179 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
1180 | } | |
1181 | ||
1182 | DBG3("UST app event %s allocated", ua_event->name); | |
1183 | ||
1184 | return ua_event; | |
1185 | ||
1186 | error: | |
1187 | return NULL; | |
1188 | } | |
1189 | ||
2463b787 JR |
1190 | /* |
1191 | * Alloc new UST app token event rule. | |
1192 | */ | |
1193 | static struct ust_app_token_event_rule *alloc_ust_app_token_event_rule( | |
1194 | struct lttng_trigger *trigger) | |
1195 | { | |
1196 | struct ust_app_token_event_rule *ua_token; | |
1197 | struct lttng_condition *condition = NULL; | |
1198 | struct lttng_event_rule *event_rule = NULL; | |
1199 | ||
1200 | ua_token = zmalloc(sizeof(struct ust_app_token_event_rule)); | |
1201 | if (ua_token == NULL) { | |
1202 | PERROR("Failed to allocate ust_app_token_event_rule structure"); | |
1203 | goto error; | |
1204 | } | |
1205 | ||
1206 | /* Get reference of the trigger */ | |
1207 | /* TODO should this be like lttng_event_rule_get with a returned bool? */ | |
1208 | lttng_trigger_get(trigger); | |
1209 | ||
1210 | ua_token->enabled = 1; | |
1211 | ua_token->token = lttng_trigger_get_tracer_token(trigger); | |
1212 | lttng_ht_node_init_u64(&ua_token->node, ua_token->token); | |
1213 | ||
1214 | condition = lttng_trigger_get_condition(trigger); | |
1215 | assert(condition); | |
1216 | assert(lttng_condition_get_type(condition) == LTTNG_CONDITION_TYPE_EVENT_RULE_HIT); | |
1217 | ||
1218 | assert(LTTNG_CONDITION_STATUS_OK == lttng_condition_event_rule_get_rule_mutable(condition, &event_rule)); | |
1219 | assert(event_rule); | |
1220 | ||
1221 | ua_token->trigger = trigger; | |
1222 | ua_token->filter = lttng_event_rule_get_filter_bytecode(event_rule); | |
1223 | ua_token->exclusion = lttng_event_rule_generate_exclusions(event_rule); | |
1224 | ua_token->error_counter_index = lttng_trigger_get_error_counter_index(trigger); | |
1225 | ||
1226 | /* TODO put capture here? or later*/ | |
1227 | ||
1228 | DBG3("UST app token event rule %" PRIu64 " allocated", ua_token->token); | |
1229 | ||
1230 | return ua_token; | |
1231 | ||
1232 | error: | |
1233 | return NULL; | |
1234 | } | |
1235 | ||
8b366481 DG |
1236 | /* |
1237 | * Alloc new UST app context. | |
1238 | */ | |
1239 | static | |
bdf64013 | 1240 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context_attr *uctx) |
8b366481 DG |
1241 | { |
1242 | struct ust_app_ctx *ua_ctx; | |
1243 | ||
1244 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
1245 | if (ua_ctx == NULL) { | |
1246 | goto error; | |
1247 | } | |
1248 | ||
31746f93 DG |
1249 | CDS_INIT_LIST_HEAD(&ua_ctx->list); |
1250 | ||
8b366481 DG |
1251 | if (uctx) { |
1252 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
bdf64013 | 1253 | if (uctx->ctx == LTTNG_UST_CONTEXT_APP_CONTEXT) { |
f3db82be | 1254 | char *provider_name = NULL, *ctx_name = NULL; |
bdf64013 JG |
1255 | |
1256 | provider_name = strdup(uctx->u.app_ctx.provider_name); | |
1257 | ctx_name = strdup(uctx->u.app_ctx.ctx_name); | |
1258 | if (!provider_name || !ctx_name) { | |
1259 | free(provider_name); | |
1260 | free(ctx_name); | |
1261 | goto error; | |
1262 | } | |
1263 | ||
1264 | ua_ctx->ctx.u.app_ctx.provider_name = provider_name; | |
1265 | ua_ctx->ctx.u.app_ctx.ctx_name = ctx_name; | |
1266 | } | |
8b366481 DG |
1267 | } |
1268 | ||
1269 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
8b366481 | 1270 | return ua_ctx; |
bdf64013 JG |
1271 | error: |
1272 | free(ua_ctx); | |
1273 | return NULL; | |
8b366481 DG |
1274 | } |
1275 | ||
025faf73 | 1276 | /* |
2463b787 | 1277 | * Create a liblttng-ust filter bytecode from given bytecode. |
025faf73 DG |
1278 | * |
1279 | * Return allocated filter or NULL on error. | |
1280 | */ | |
2463b787 JR |
1281 | static struct lttng_ust_filter_bytecode * |
1282 | create_ust_filter_bytecode_from_bytecode(const struct lttng_bytecode *orig_f) | |
025faf73 | 1283 | { |
2463b787 | 1284 | struct lttng_ust_filter_bytecode *filter = NULL; |
025faf73 DG |
1285 | |
1286 | /* Copy filter bytecode */ | |
1287 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
1288 | if (!filter) { | |
2463b787 | 1289 | PERROR("zmalloc alloc ust filter bytecode"); |
025faf73 DG |
1290 | goto error; |
1291 | } | |
1292 | ||
2463b787 JR |
1293 | assert(sizeof(struct lttng_bytecode) == |
1294 | sizeof(struct lttng_ust_filter_bytecode)); | |
025faf73 | 1295 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); |
025faf73 DG |
1296 | error: |
1297 | return filter; | |
1298 | } | |
1299 | ||
51755dc8 | 1300 | /* |
2463b787 | 1301 | * Create a liblttng-ust capture bytecode from given bytecode. |
51755dc8 JG |
1302 | * |
1303 | * Return allocated filter or NULL on error. | |
1304 | */ | |
2463b787 JR |
1305 | static struct lttng_ust_capture_bytecode * |
1306 | create_ust_capture_bytecode_from_bytecode(const struct lttng_bytecode *orig_f) | |
51755dc8 | 1307 | { |
2463b787 | 1308 | struct lttng_ust_capture_bytecode *capture = NULL; |
51755dc8 | 1309 | |
2463b787 JR |
1310 | /* Copy capture bytecode */ |
1311 | capture = zmalloc(sizeof(*capture) + orig_f->len); | |
1312 | if (!capture) { | |
1313 | PERROR("zmalloc alloc ust capture bytecode"); | |
51755dc8 JG |
1314 | goto error; |
1315 | } | |
1316 | ||
2463b787 JR |
1317 | assert(sizeof(struct lttng_bytecode) == |
1318 | sizeof(struct lttng_ust_capture_bytecode)); | |
1319 | memcpy(capture, orig_f, sizeof(*capture) + orig_f->len); | |
51755dc8 | 1320 | error: |
2463b787 | 1321 | return capture; |
51755dc8 JG |
1322 | } |
1323 | ||
099e26bd | 1324 | /* |
421cb601 DG |
1325 | * Find an ust_app using the sock and return it. RCU read side lock must be |
1326 | * held before calling this helper function. | |
099e26bd | 1327 | */ |
f20baf8e | 1328 | struct ust_app *ust_app_find_by_sock(int sock) |
099e26bd | 1329 | { |
bec39940 | 1330 | struct lttng_ht_node_ulong *node; |
bec39940 | 1331 | struct lttng_ht_iter iter; |
f6a9efaa | 1332 | |
852d0037 | 1333 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 1334 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
1335 | if (node == NULL) { |
1336 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
1337 | goto error; |
1338 | } | |
852d0037 DG |
1339 | |
1340 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
1341 | |
1342 | error: | |
1343 | return NULL; | |
099e26bd DG |
1344 | } |
1345 | ||
d0b96690 DG |
1346 | /* |
1347 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
1348 | * be held before calling this helper function. | |
1349 | */ | |
1350 | static struct ust_app *find_app_by_notify_sock(int sock) | |
1351 | { | |
1352 | struct lttng_ht_node_ulong *node; | |
1353 | struct lttng_ht_iter iter; | |
1354 | ||
1355 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
1356 | &iter); | |
1357 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1358 | if (node == NULL) { | |
1359 | DBG2("UST app find by notify sock %d not found", sock); | |
1360 | goto error; | |
1361 | } | |
1362 | ||
1363 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
1364 | ||
1365 | error: | |
1366 | return NULL; | |
1367 | } | |
1368 | ||
025faf73 DG |
1369 | /* |
1370 | * Lookup for an ust app event based on event name, filter bytecode and the | |
1371 | * event loglevel. | |
1372 | * | |
1373 | * Return an ust_app_event object or NULL on error. | |
1374 | */ | |
18eace3b | 1375 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
2463b787 | 1376 | const char *name, const struct lttng_bytecode *filter, |
2106efa0 | 1377 | int loglevel_value, |
39c5a3a7 | 1378 | const struct lttng_event_exclusion *exclusion) |
18eace3b DG |
1379 | { |
1380 | struct lttng_ht_iter iter; | |
1381 | struct lttng_ht_node_str *node; | |
1382 | struct ust_app_event *event = NULL; | |
1383 | struct ust_app_ht_key key; | |
18eace3b DG |
1384 | |
1385 | assert(name); | |
1386 | assert(ht); | |
1387 | ||
1388 | /* Setup key for event lookup. */ | |
1389 | key.name = name; | |
1390 | key.filter = filter; | |
2106efa0 | 1391 | key.loglevel_type = loglevel_value; |
39c5a3a7 | 1392 | /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */ |
51755dc8 | 1393 | key.exclusion = exclusion; |
18eace3b | 1394 | |
025faf73 DG |
1395 | /* Lookup using the event name as hash and a custom match fct. */ |
1396 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1397 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1398 | node = lttng_ht_iter_get_node_str(&iter); |
1399 | if (node == NULL) { | |
1400 | goto end; | |
1401 | } | |
1402 | ||
1403 | event = caa_container_of(node, struct ust_app_event, node); | |
1404 | ||
1405 | end: | |
18eace3b DG |
1406 | return event; |
1407 | } | |
1408 | ||
2463b787 JR |
1409 | /* |
1410 | * Lookup for an ust app tokens based on a token id. | |
1411 | * | |
1412 | * Return an ust_app_token_event_rule object or NULL on error. | |
1413 | */ | |
1414 | static struct ust_app_token_event_rule *find_ust_app_token_event_rule(struct lttng_ht *ht, | |
1415 | uint64_t token) | |
1416 | { | |
1417 | struct lttng_ht_iter iter; | |
1418 | struct lttng_ht_node_u64 *node; | |
1419 | struct ust_app_token_event_rule *token_event_rule = NULL; | |
1420 | ||
1421 | assert(ht); | |
1422 | ||
1423 | lttng_ht_lookup(ht, &token, &iter); | |
1424 | node = lttng_ht_iter_get_node_u64(&iter); | |
1425 | if (node == NULL) { | |
1426 | DBG2("UST app token %" PRIu64 " not found", token); | |
1427 | goto end; | |
1428 | } | |
1429 | ||
1430 | token_event_rule = caa_container_of(node, struct ust_app_token_event_rule, node); | |
1431 | end: | |
1432 | return token_event_rule; | |
1433 | } | |
1434 | ||
55cc08a6 DG |
1435 | /* |
1436 | * Create the channel context on the tracer. | |
d0b96690 DG |
1437 | * |
1438 | * Called with UST app session lock held. | |
55cc08a6 DG |
1439 | */ |
1440 | static | |
1441 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1442 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1443 | { | |
1444 | int ret; | |
1445 | ||
840cb59c | 1446 | health_code_update(); |
86acf0da | 1447 | |
fb45065e | 1448 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1449 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 | 1450 | ua_chan->obj, &ua_ctx->obj); |
fb45065e | 1451 | pthread_mutex_unlock(&app->sock_lock); |
55cc08a6 | 1452 | if (ret < 0) { |
ffe60014 DG |
1453 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1454 | ERR("UST app create channel context failed for app (pid: %d) " | |
1455 | "with ret %d", app->pid, ret); | |
1456 | } else { | |
3757b385 DG |
1457 | /* |
1458 | * This is normal behavior, an application can die during the | |
1459 | * creation process. Don't report an error so the execution can | |
1460 | * continue normally. | |
1461 | */ | |
1462 | ret = 0; | |
88e3c2f5 | 1463 | DBG3("UST app add context failed. Application is dead."); |
ffe60014 | 1464 | } |
55cc08a6 DG |
1465 | goto error; |
1466 | } | |
1467 | ||
1468 | ua_ctx->handle = ua_ctx->obj->handle; | |
1469 | ||
d0b96690 DG |
1470 | DBG2("UST app context handle %d created successfully for channel %s", |
1471 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1472 | |
1473 | error: | |
840cb59c | 1474 | health_code_update(); |
55cc08a6 DG |
1475 | return ret; |
1476 | } | |
1477 | ||
53a80697 MD |
1478 | /* |
1479 | * Set the filter on the tracer. | |
1480 | */ | |
2463b787 JR |
1481 | static int set_ust_filter(struct ust_app *app, |
1482 | const struct lttng_bytecode *bytecode, | |
1483 | struct lttng_ust_object_data *ust_object) | |
53a80697 MD |
1484 | { |
1485 | int ret; | |
51755dc8 | 1486 | struct lttng_ust_filter_bytecode *ust_bytecode = NULL; |
53a80697 | 1487 | |
840cb59c | 1488 | health_code_update(); |
86acf0da | 1489 | |
2463b787 JR |
1490 | ust_bytecode = create_ust_filter_bytecode_from_bytecode(bytecode); |
1491 | if (!ust_bytecode) { | |
1492 | ret = -LTTNG_ERR_NOMEM; | |
1493 | goto error; | |
1494 | } | |
1495 | pthread_mutex_lock(&app->sock_lock); | |
1496 | ret = ustctl_set_filter(app->sock, ust_bytecode, | |
1497 | ust_object); | |
1498 | pthread_mutex_unlock(&app->sock_lock); | |
1499 | if (ret < 0) { | |
1500 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1501 | ERR("UST app set filter failed for object %p of app (pid: %d) " | |
1502 | "with ret %d", ust_object, app->pid, ret); | |
1503 | } else { | |
1504 | /* | |
1505 | * This is normal behavior, an application can die during the | |
1506 | * creation process. Don't report an error so the execution can | |
1507 | * continue normally. | |
1508 | */ | |
1509 | ret = 0; | |
1510 | DBG3("UST app set filter. Application is dead."); | |
1511 | } | |
86acf0da | 1512 | goto error; |
53a80697 MD |
1513 | } |
1514 | ||
2463b787 JR |
1515 | DBG2("UST filter set for object %p successfully", ust_object); |
1516 | ||
1517 | error: | |
1518 | health_code_update(); | |
1519 | free(ust_bytecode); | |
1520 | return ret; | |
1521 | } | |
1522 | ||
1523 | /* | |
1524 | * Set a capture bytecode for the passed object. | |
1525 | * The seqnum enforce the ordering at runtime and on reception. | |
1526 | */ | |
1527 | static int set_ust_capture(struct ust_app *app, | |
1528 | const struct lttng_bytecode *bytecode, | |
1529 | unsigned int seqnum, | |
1530 | struct lttng_ust_object_data *ust_object) | |
1531 | { | |
1532 | int ret; | |
1533 | struct lttng_ust_capture_bytecode *ust_bytecode = NULL; | |
1534 | ||
1535 | health_code_update(); | |
1536 | ||
1537 | ust_bytecode = create_ust_capture_bytecode_from_bytecode(bytecode); | |
51755dc8 JG |
1538 | if (!ust_bytecode) { |
1539 | ret = -LTTNG_ERR_NOMEM; | |
1540 | goto error; | |
1541 | } | |
2463b787 JR |
1542 | |
1543 | /* Set the seqnum */ | |
1544 | ust_bytecode->seqnum = seqnum; | |
1545 | ||
fb45065e | 1546 | pthread_mutex_lock(&app->sock_lock); |
2463b787 JR |
1547 | ret = ustctl_set_capture(app->sock, ust_bytecode, |
1548 | ust_object); | |
fb45065e | 1549 | pthread_mutex_unlock(&app->sock_lock); |
53a80697 | 1550 | if (ret < 0) { |
ffe60014 | 1551 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
2463b787 JR |
1552 | ERR("UST app set capture failed for object %p of app (pid: %d) " |
1553 | "with ret %d", ust_object, app->pid, ret); | |
ffe60014 | 1554 | } else { |
3757b385 DG |
1555 | /* |
1556 | * This is normal behavior, an application can die during the | |
1557 | * creation process. Don't report an error so the execution can | |
1558 | * continue normally. | |
1559 | */ | |
1560 | ret = 0; | |
2463b787 | 1561 | DBG3("UST app set capture. Application is dead."); |
ffe60014 | 1562 | } |
53a80697 MD |
1563 | goto error; |
1564 | } | |
1565 | ||
2463b787 | 1566 | DBG2("UST capture set for object %p successfully", ust_object); |
53a80697 MD |
1567 | |
1568 | error: | |
840cb59c | 1569 | health_code_update(); |
51755dc8 | 1570 | free(ust_bytecode); |
53a80697 MD |
1571 | return ret; |
1572 | } | |
1573 | ||
51755dc8 JG |
1574 | static |
1575 | struct lttng_ust_event_exclusion *create_ust_exclusion_from_exclusion( | |
1576 | struct lttng_event_exclusion *exclusion) | |
1577 | { | |
1578 | struct lttng_ust_event_exclusion *ust_exclusion = NULL; | |
1579 | size_t exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) + | |
1580 | LTTNG_UST_SYM_NAME_LEN * exclusion->count; | |
1581 | ||
1582 | ust_exclusion = zmalloc(exclusion_alloc_size); | |
1583 | if (!ust_exclusion) { | |
1584 | PERROR("malloc"); | |
1585 | goto end; | |
1586 | } | |
1587 | ||
1588 | assert(sizeof(struct lttng_event_exclusion) == | |
1589 | sizeof(struct lttng_ust_event_exclusion)); | |
1590 | memcpy(ust_exclusion, exclusion, exclusion_alloc_size); | |
1591 | end: | |
1592 | return ust_exclusion; | |
1593 | } | |
1594 | ||
7cc9a73c JI |
1595 | /* |
1596 | * Set event exclusions on the tracer. | |
1597 | */ | |
2463b787 JR |
1598 | static int set_ust_exclusions(struct ust_app *app, |
1599 | struct lttng_event_exclusion *exclusions, | |
1600 | struct lttng_ust_object_data *ust_object) | |
7cc9a73c JI |
1601 | { |
1602 | int ret; | |
2463b787 | 1603 | struct lttng_ust_event_exclusion *ust_exclusions = NULL; |
7cc9a73c | 1604 | |
2463b787 | 1605 | assert(exclusions && exclusions->count > 0); |
7cc9a73c | 1606 | |
2463b787 | 1607 | health_code_update(); |
7cc9a73c | 1608 | |
2463b787 JR |
1609 | ust_exclusions = create_ust_exclusion_from_exclusion( |
1610 | exclusions); | |
1611 | if (!ust_exclusions) { | |
51755dc8 JG |
1612 | ret = -LTTNG_ERR_NOMEM; |
1613 | goto error; | |
1614 | } | |
fb45065e | 1615 | pthread_mutex_lock(&app->sock_lock); |
2463b787 | 1616 | ret = ustctl_set_exclusion(app->sock, ust_exclusions, ust_object); |
fb45065e | 1617 | pthread_mutex_unlock(&app->sock_lock); |
7cc9a73c JI |
1618 | if (ret < 0) { |
1619 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
2463b787 JR |
1620 | ERR("UST app exclusions failed for object %p of app (pid: %d) " |
1621 | "with ret %d", ust_object, app->pid, ret); | |
7cc9a73c JI |
1622 | } else { |
1623 | /* | |
1624 | * This is normal behavior, an application can die during the | |
1625 | * creation process. Don't report an error so the execution can | |
1626 | * continue normally. | |
1627 | */ | |
1628 | ret = 0; | |
2463b787 | 1629 | DBG3("UST app set exclusions failed. Application is dead."); |
7cc9a73c JI |
1630 | } |
1631 | goto error; | |
1632 | } | |
1633 | ||
2463b787 | 1634 | DBG2("UST exclusions set successfully for object %p", ust_object); |
7cc9a73c JI |
1635 | |
1636 | error: | |
1637 | health_code_update(); | |
2463b787 | 1638 | free(ust_exclusions); |
7cc9a73c JI |
1639 | return ret; |
1640 | } | |
1641 | ||
9730260e DG |
1642 | /* |
1643 | * Disable the specified event on to UST tracer for the UST session. | |
1644 | */ | |
2463b787 JR |
1645 | static int disable_ust_object(struct ust_app *app, |
1646 | struct lttng_ust_object_data *object) | |
9730260e DG |
1647 | { |
1648 | int ret; | |
1649 | ||
840cb59c | 1650 | health_code_update(); |
86acf0da | 1651 | |
fb45065e | 1652 | pthread_mutex_lock(&app->sock_lock); |
2463b787 | 1653 | ret = ustctl_disable(app->sock, object); |
fb45065e | 1654 | pthread_mutex_unlock(&app->sock_lock); |
9730260e | 1655 | if (ret < 0) { |
ffe60014 | 1656 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
2463b787 JR |
1657 | ERR("UST app disable failed for object %p app (pid: %d) with ret %d", |
1658 | object, app->pid, ret); | |
ffe60014 | 1659 | } else { |
3757b385 DG |
1660 | /* |
1661 | * This is normal behavior, an application can die during the | |
1662 | * creation process. Don't report an error so the execution can | |
1663 | * continue normally. | |
1664 | */ | |
1665 | ret = 0; | |
ffe60014 DG |
1666 | DBG3("UST app disable event failed. Application is dead."); |
1667 | } | |
9730260e DG |
1668 | goto error; |
1669 | } | |
1670 | ||
2463b787 JR |
1671 | DBG2("UST app object %p disabled successfully for app (pid: %d)", |
1672 | object, app->pid); | |
9730260e DG |
1673 | |
1674 | error: | |
840cb59c | 1675 | health_code_update(); |
9730260e DG |
1676 | return ret; |
1677 | } | |
1678 | ||
78f0bacd DG |
1679 | /* |
1680 | * Disable the specified channel on to UST tracer for the UST session. | |
1681 | */ | |
1682 | static int disable_ust_channel(struct ust_app *app, | |
1683 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1684 | { | |
1685 | int ret; | |
1686 | ||
840cb59c | 1687 | health_code_update(); |
86acf0da | 1688 | |
fb45065e | 1689 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1690 | ret = ustctl_disable(app->sock, ua_chan->obj); |
fb45065e | 1691 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1692 | if (ret < 0) { |
ffe60014 DG |
1693 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1694 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1695 | "and session handle %d with ret %d", | |
1696 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1697 | } else { | |
3757b385 DG |
1698 | /* |
1699 | * This is normal behavior, an application can die during the | |
1700 | * creation process. Don't report an error so the execution can | |
1701 | * continue normally. | |
1702 | */ | |
1703 | ret = 0; | |
ffe60014 DG |
1704 | DBG3("UST app disable channel failed. Application is dead."); |
1705 | } | |
78f0bacd DG |
1706 | goto error; |
1707 | } | |
1708 | ||
78f0bacd | 1709 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1710 | ua_chan->name, app->pid); |
78f0bacd DG |
1711 | |
1712 | error: | |
840cb59c | 1713 | health_code_update(); |
78f0bacd DG |
1714 | return ret; |
1715 | } | |
1716 | ||
1717 | /* | |
1718 | * Enable the specified channel on to UST tracer for the UST session. | |
1719 | */ | |
1720 | static int enable_ust_channel(struct ust_app *app, | |
1721 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1722 | { | |
1723 | int ret; | |
1724 | ||
840cb59c | 1725 | health_code_update(); |
86acf0da | 1726 | |
fb45065e | 1727 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1728 | ret = ustctl_enable(app->sock, ua_chan->obj); |
fb45065e | 1729 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1730 | if (ret < 0) { |
ffe60014 DG |
1731 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1732 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1733 | "and session handle %d with ret %d", | |
1734 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1735 | } else { | |
3757b385 DG |
1736 | /* |
1737 | * This is normal behavior, an application can die during the | |
1738 | * creation process. Don't report an error so the execution can | |
1739 | * continue normally. | |
1740 | */ | |
1741 | ret = 0; | |
ffe60014 DG |
1742 | DBG3("UST app enable channel failed. Application is dead."); |
1743 | } | |
78f0bacd DG |
1744 | goto error; |
1745 | } | |
1746 | ||
1747 | ua_chan->enabled = 1; | |
1748 | ||
1749 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1750 | ua_chan->name, app->pid); |
78f0bacd DG |
1751 | |
1752 | error: | |
840cb59c | 1753 | health_code_update(); |
78f0bacd DG |
1754 | return ret; |
1755 | } | |
1756 | ||
edb67388 DG |
1757 | /* |
1758 | * Enable the specified event on to UST tracer for the UST session. | |
1759 | */ | |
2463b787 | 1760 | static int enable_ust_object(struct ust_app *app, struct lttng_ust_object_data *ust_object) |
edb67388 DG |
1761 | { |
1762 | int ret; | |
1763 | ||
840cb59c | 1764 | health_code_update(); |
86acf0da | 1765 | |
fb45065e | 1766 | pthread_mutex_lock(&app->sock_lock); |
2463b787 | 1767 | ret = ustctl_enable(app->sock, ust_object); |
fb45065e | 1768 | pthread_mutex_unlock(&app->sock_lock); |
edb67388 | 1769 | if (ret < 0) { |
ffe60014 | 1770 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
2463b787 JR |
1771 | ERR("UST app enable failed for object %p app (pid: %d) with ret %d", |
1772 | ust_object, app->pid, ret); | |
ffe60014 | 1773 | } else { |
3757b385 DG |
1774 | /* |
1775 | * This is normal behavior, an application can die during the | |
1776 | * creation process. Don't report an error so the execution can | |
1777 | * continue normally. | |
1778 | */ | |
1779 | ret = 0; | |
2463b787 | 1780 | DBG3("UST app enable failed. Application is dead."); |
ffe60014 | 1781 | } |
edb67388 DG |
1782 | goto error; |
1783 | } | |
1784 | ||
2463b787 JR |
1785 | DBG2("UST app object %p enabled successfully for app (pid: %d)", |
1786 | ust_object, app->pid); | |
edb67388 DG |
1787 | |
1788 | error: | |
840cb59c | 1789 | health_code_update(); |
edb67388 DG |
1790 | return ret; |
1791 | } | |
1792 | ||
099e26bd | 1793 | /* |
7972aab2 | 1794 | * Send channel and stream buffer to application. |
4f3ab6ee | 1795 | * |
ffe60014 | 1796 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1797 | */ |
7972aab2 DG |
1798 | static int send_channel_pid_to_ust(struct ust_app *app, |
1799 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1800 | { |
1801 | int ret; | |
ffe60014 | 1802 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1803 | |
1804 | assert(app); | |
ffe60014 | 1805 | assert(ua_sess); |
4f3ab6ee | 1806 | assert(ua_chan); |
4f3ab6ee | 1807 | |
840cb59c | 1808 | health_code_update(); |
4f3ab6ee | 1809 | |
7972aab2 DG |
1810 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1811 | app->sock); | |
86acf0da | 1812 | |
ffe60014 DG |
1813 | /* Send channel to the application. */ |
1814 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
1815 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1816 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1817 | goto error; | |
1818 | } else if (ret < 0) { | |
b551a063 DG |
1819 | goto error; |
1820 | } | |
1821 | ||
d88aee68 DG |
1822 | health_code_update(); |
1823 | ||
ffe60014 DG |
1824 | /* Send all streams to application. */ |
1825 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1826 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
a7169585 MD |
1827 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1828 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1829 | goto error; | |
1830 | } else if (ret < 0) { | |
ffe60014 DG |
1831 | goto error; |
1832 | } | |
1833 | /* We don't need the stream anymore once sent to the tracer. */ | |
1834 | cds_list_del(&stream->list); | |
fb45065e | 1835 | delete_ust_app_stream(-1, stream, app); |
ffe60014 | 1836 | } |
ffe60014 DG |
1837 | /* Flag the channel that it is sent to the application. */ |
1838 | ua_chan->is_sent = 1; | |
ffe60014 | 1839 | |
b551a063 | 1840 | error: |
840cb59c | 1841 | health_code_update(); |
b551a063 DG |
1842 | return ret; |
1843 | } | |
1844 | ||
91d76f53 | 1845 | /* |
5b4a0ec0 | 1846 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1847 | * |
1848 | * Should be called with session mutex held. | |
91d76f53 | 1849 | */ |
edb67388 DG |
1850 | static |
1851 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1852 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1853 | { |
5b4a0ec0 | 1854 | int ret = 0; |
284d8f55 | 1855 | |
840cb59c | 1856 | health_code_update(); |
86acf0da | 1857 | |
5b4a0ec0 | 1858 | /* Create UST event on tracer */ |
fb45065e | 1859 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1860 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 | 1861 | &ua_event->obj); |
fb45065e | 1862 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 | 1863 | if (ret < 0) { |
ffe60014 | 1864 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
88e3c2f5 | 1865 | abort(); |
ffe60014 DG |
1866 | ERR("Error ustctl create event %s for app pid: %d with ret %d", |
1867 | ua_event->attr.name, app->pid, ret); | |
1868 | } else { | |
3757b385 DG |
1869 | /* |
1870 | * This is normal behavior, an application can die during the | |
1871 | * creation process. Don't report an error so the execution can | |
1872 | * continue normally. | |
1873 | */ | |
1874 | ret = 0; | |
ffe60014 DG |
1875 | DBG3("UST app create event failed. Application is dead."); |
1876 | } | |
5b4a0ec0 | 1877 | goto error; |
91d76f53 | 1878 | } |
f6a9efaa | 1879 | |
5b4a0ec0 | 1880 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1881 | |
2463b787 JR |
1882 | DBG2("UST app event %s created successfully for pid:%d object: %p", |
1883 | ua_event->attr.name, app->pid, ua_event->obj); | |
f6a9efaa | 1884 | |
840cb59c | 1885 | health_code_update(); |
86acf0da | 1886 | |
025faf73 DG |
1887 | /* Set filter if one is present. */ |
1888 | if (ua_event->filter) { | |
2463b787 | 1889 | ret = set_ust_filter(app, ua_event->filter, ua_event->obj); |
025faf73 DG |
1890 | if (ret < 0) { |
1891 | goto error; | |
1892 | } | |
1893 | } | |
1894 | ||
7cc9a73c JI |
1895 | /* Set exclusions for the event */ |
1896 | if (ua_event->exclusion) { | |
2463b787 | 1897 | ret = set_ust_exclusions(app, ua_event->exclusion, ua_event->obj); |
7cc9a73c JI |
1898 | if (ret < 0) { |
1899 | goto error; | |
1900 | } | |
1901 | } | |
1902 | ||
8535a6d9 | 1903 | /* If event not enabled, disable it on the tracer */ |
40113787 MD |
1904 | if (ua_event->enabled) { |
1905 | /* | |
1906 | * We now need to explicitly enable the event, since it | |
1907 | * is now disabled at creation. | |
1908 | */ | |
2463b787 | 1909 | ret = enable_ust_object(app, ua_event->obj); |
40113787 MD |
1910 | if (ret < 0) { |
1911 | /* | |
1912 | * If we hit an EPERM, something is wrong with our enable call. If | |
1913 | * we get an EEXIST, there is a problem on the tracer side since we | |
1914 | * just created it. | |
1915 | */ | |
1916 | switch (ret) { | |
1917 | case -LTTNG_UST_ERR_PERM: | |
1918 | /* Code flow problem */ | |
1919 | assert(0); | |
1920 | case -LTTNG_UST_ERR_EXIST: | |
1921 | /* It's OK for our use case. */ | |
1922 | ret = 0; | |
1923 | break; | |
1924 | default: | |
1925 | break; | |
1926 | } | |
1927 | goto error; | |
1928 | } | |
8535a6d9 DG |
1929 | } |
1930 | ||
5b4a0ec0 | 1931 | error: |
840cb59c | 1932 | health_code_update(); |
5b4a0ec0 | 1933 | return ret; |
91d76f53 | 1934 | } |
48842b30 | 1935 | |
2463b787 JR |
1936 | static |
1937 | void init_ust_trigger_from_event_rule(const struct lttng_event_rule *rule, struct lttng_ust_trigger *trigger) | |
1938 | { | |
1939 | enum lttng_event_rule_status status; | |
1940 | enum lttng_loglevel_type loglevel_type; | |
1941 | enum lttng_ust_loglevel_type ust_loglevel_type = LTTNG_UST_LOGLEVEL_ALL; | |
1942 | int loglevel = -1; | |
1943 | const char *pattern; | |
1944 | ||
1945 | /* For now only LTTNG_EVENT_RULE_TYPE_TRACEPOINT are supported */ | |
1946 | assert(lttng_event_rule_get_type(rule) == LTTNG_EVENT_RULE_TYPE_TRACEPOINT); | |
1947 | ||
1948 | memset(trigger, 0, sizeof(*trigger)); | |
1949 | ||
1950 | if (lttng_event_rule_is_agent(rule)) { | |
1951 | /* | |
1952 | * Special event for agents | |
1953 | * The actual meat of the event is in the filter that will be | |
1954 | * attached later on. | |
1955 | * Set the default values for the agent event. | |
1956 | */ | |
1957 | pattern = event_get_default_agent_ust_name(lttng_event_rule_get_domain_type(rule)); | |
1958 | loglevel = 0; | |
1959 | ust_loglevel_type = LTTNG_UST_LOGLEVEL_ALL; | |
1960 | } else { | |
1961 | status = lttng_event_rule_tracepoint_get_pattern(rule, &pattern); | |
1962 | if (status != LTTNG_EVENT_RULE_STATUS_OK) { | |
1963 | /* At this point this is a fatal error */ | |
1964 | assert(0); | |
1965 | } | |
1966 | ||
1967 | status = lttng_event_rule_tracepoint_get_log_level_type( | |
1968 | rule, &loglevel_type); | |
1969 | if (status != LTTNG_EVENT_RULE_STATUS_OK) { | |
1970 | /* At this point this is a fatal error */ | |
1971 | assert(0); | |
1972 | } | |
1973 | ||
1974 | switch (loglevel_type) { | |
1975 | case LTTNG_EVENT_LOGLEVEL_ALL: | |
1976 | ust_loglevel_type = LTTNG_UST_LOGLEVEL_ALL; | |
1977 | break; | |
1978 | case LTTNG_EVENT_LOGLEVEL_RANGE: | |
1979 | ust_loglevel_type = LTTNG_UST_LOGLEVEL_RANGE; | |
1980 | break; | |
1981 | case LTTNG_EVENT_LOGLEVEL_SINGLE: | |
1982 | ust_loglevel_type = LTTNG_UST_LOGLEVEL_SINGLE; | |
1983 | break; | |
1984 | } | |
1985 | ||
1986 | if (loglevel_type != LTTNG_EVENT_LOGLEVEL_ALL) { | |
1987 | status = lttng_event_rule_tracepoint_get_log_level( | |
1988 | rule, &loglevel); | |
1989 | assert(status == LTTNG_EVENT_RULE_STATUS_OK); | |
1990 | } | |
1991 | } | |
1992 | ||
1993 | trigger->instrumentation = LTTNG_UST_TRACEPOINT; | |
1994 | strncpy(trigger->name, pattern, LTTNG_UST_SYM_NAME_LEN - 1); | |
1995 | trigger->loglevel_type = ust_loglevel_type; | |
1996 | trigger->loglevel = loglevel; | |
1997 | } | |
1998 | ||
1999 | /* | |
2000 | * Create the specified event rule token onto the UST tracer for a UST app. | |
2001 | */ | |
2002 | static | |
2003 | int create_ust_token_event_rule(struct ust_app *app, struct ust_app_token_event_rule *ua_token) | |
2004 | { | |
2005 | int ret = 0; | |
2006 | struct lttng_ust_trigger trigger; | |
2007 | struct lttng_condition *condition = NULL; | |
2008 | struct lttng_event_rule *event_rule = NULL; | |
2009 | unsigned int capture_bytecode_count = 0; | |
2010 | ||
2011 | health_code_update(); | |
2012 | assert(app->token_communication.handle); | |
2013 | ||
2014 | condition = lttng_trigger_get_condition(ua_token->trigger); | |
2015 | assert(condition); | |
2016 | assert(lttng_condition_get_type(condition) == LTTNG_CONDITION_TYPE_EVENT_RULE_HIT); | |
2017 | ||
2018 | lttng_condition_event_rule_get_rule_mutable(condition, &event_rule); | |
2019 | assert(event_rule); | |
2020 | assert(lttng_event_rule_get_type(event_rule) == LTTNG_EVENT_RULE_TYPE_TRACEPOINT); | |
2021 | /* Should we also test for UST at this point, or do we trust all the | |
2022 | * upper level? */ | |
2023 | ||
2024 | init_ust_trigger_from_event_rule(event_rule, &trigger); | |
2025 | ||
2026 | trigger.id = ua_token->token; | |
2027 | trigger.error_counter_index = ua_token->error_counter_index; | |
2028 | ||
2029 | /* Create UST trigger on tracer */ | |
2030 | pthread_mutex_lock(&app->sock_lock); | |
2031 | ret = ustctl_create_trigger(app->sock, &trigger, app->token_communication.handle, &ua_token->obj); | |
2032 | pthread_mutex_unlock(&app->sock_lock); | |
2033 | if (ret < 0) { | |
2034 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
2035 | abort(); | |
2036 | ERR("Error ustctl create trigger %s for app pid: %d with ret %d", | |
2037 | trigger.name, app->pid, ret); | |
2038 | } else { | |
2039 | /* | |
2040 | * This is normal behavior, an application can die during the | |
2041 | * creation process. Don't report an error so the execution can | |
2042 | * continue normally. | |
2043 | */ | |
2044 | ret = 0; | |
2045 | DBG3("UST app create event failed. Application is dead."); | |
2046 | } | |
2047 | goto error; | |
2048 | } | |
2049 | ||
2050 | ua_token->handle = ua_token->obj->handle; | |
2051 | ||
2052 | DBG2("UST app event %s created successfully for pid:%d object: %p", | |
2053 | trigger.name, app->pid, ua_token->obj); | |
2054 | ||
2055 | health_code_update(); | |
2056 | ||
2057 | /* Set filter if one is present. */ | |
2058 | if (ua_token->filter) { | |
2059 | ret = set_ust_filter(app, ua_token->filter, ua_token->obj); | |
2060 | if (ret < 0) { | |
2061 | goto error; | |
2062 | } | |
2063 | } | |
2064 | ||
2065 | /* Set exclusions for the event */ | |
2066 | if (ua_token->exclusion) { | |
2067 | ret = set_ust_exclusions(app, ua_token->exclusion, ua_token->obj); | |
2068 | if (ret < 0) { | |
2069 | goto error; | |
2070 | } | |
2071 | } | |
2072 | ||
2073 | /* Set the capture bytecode | |
2074 | * TODO: do we want to emulate what is done with exclusion and provide | |
2075 | * and object with a count of capture bytecode? instead of multiple | |
2076 | * call? | |
2077 | * */ | |
2078 | capture_bytecode_count = lttng_trigger_get_capture_bytecode_count(ua_token->trigger); | |
2079 | for (unsigned int i = 0; i < capture_bytecode_count; i++) { | |
2080 | const struct lttng_bytecode *capture_bytecode = lttng_trigger_get_capture_bytecode_at_index(ua_token->trigger, i); | |
2081 | ret = set_ust_capture(app, capture_bytecode, i, ua_token->obj); | |
2082 | if (ret < 0) { | |
2083 | goto error; | |
2084 | } | |
2085 | } | |
2086 | ||
2087 | /* | |
2088 | * We now need to explicitly enable the event, since it | |
2089 | * is disabled at creation. | |
2090 | */ | |
2091 | ret = enable_ust_object(app, ua_token->obj); | |
2092 | if (ret < 0) { | |
2093 | /* | |
2094 | * If we hit an EPERM, something is wrong with our enable call. If | |
2095 | * we get an EEXIST, there is a problem on the tracer side since we | |
2096 | * just created it. | |
2097 | */ | |
2098 | switch (ret) { | |
2099 | case -LTTNG_UST_ERR_PERM: | |
2100 | /* Code flow problem */ | |
2101 | assert(0); | |
2102 | case -LTTNG_UST_ERR_EXIST: | |
2103 | /* It's OK for our use case. */ | |
2104 | ret = 0; | |
2105 | break; | |
2106 | default: | |
2107 | break; | |
2108 | } | |
2109 | goto error; | |
2110 | } | |
2111 | ua_token->enabled = true; | |
2112 | ||
2113 | error: | |
2114 | health_code_update(); | |
2115 | return ret; | |
2116 | } | |
2117 | ||
5b4a0ec0 DG |
2118 | /* |
2119 | * Copy data between an UST app event and a LTT event. | |
2120 | */ | |
421cb601 | 2121 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
2122 | struct ltt_ust_event *uevent) |
2123 | { | |
b4ffad32 JI |
2124 | size_t exclusion_alloc_size; |
2125 | ||
48842b30 DG |
2126 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); |
2127 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
2128 | ||
fc34caaa DG |
2129 | ua_event->enabled = uevent->enabled; |
2130 | ||
5b4a0ec0 DG |
2131 | /* Copy event attributes */ |
2132 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
2133 | ||
53a80697 MD |
2134 | /* Copy filter bytecode */ |
2135 | if (uevent->filter) { | |
2463b787 | 2136 | ua_event->filter = bytecode_copy(uevent->filter); |
025faf73 | 2137 | /* Filter might be NULL here in case of ENONEM. */ |
53a80697 | 2138 | } |
b4ffad32 JI |
2139 | |
2140 | /* Copy exclusion data */ | |
2141 | if (uevent->exclusion) { | |
51755dc8 | 2142 | exclusion_alloc_size = sizeof(struct lttng_event_exclusion) + |
b4ffad32 JI |
2143 | LTTNG_UST_SYM_NAME_LEN * uevent->exclusion->count; |
2144 | ua_event->exclusion = zmalloc(exclusion_alloc_size); | |
5f8df26c JI |
2145 | if (ua_event->exclusion == NULL) { |
2146 | PERROR("malloc"); | |
2147 | } else { | |
2148 | memcpy(ua_event->exclusion, uevent->exclusion, | |
2149 | exclusion_alloc_size); | |
b4ffad32 JI |
2150 | } |
2151 | } | |
48842b30 DG |
2152 | } |
2153 | ||
5b4a0ec0 DG |
2154 | /* |
2155 | * Copy data between an UST app channel and a LTT channel. | |
2156 | */ | |
421cb601 | 2157 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
2158 | struct ltt_ust_channel *uchan) |
2159 | { | |
fc34caaa | 2160 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
2161 | |
2162 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
2163 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 2164 | |
1624d5b7 JD |
2165 | ua_chan->tracefile_size = uchan->tracefile_size; |
2166 | ua_chan->tracefile_count = uchan->tracefile_count; | |
2167 | ||
ffe60014 DG |
2168 | /* Copy event attributes since the layout is different. */ |
2169 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
2170 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
2171 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
2172 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
2173 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
e9404c27 | 2174 | ua_chan->monitor_timer_interval = uchan->monitor_timer_interval; |
ffe60014 | 2175 | ua_chan->attr.output = uchan->attr.output; |
491d1539 MD |
2176 | ua_chan->attr.blocking_timeout = uchan->attr.u.s.blocking_timeout; |
2177 | ||
ffe60014 DG |
2178 | /* |
2179 | * Note that the attribute channel type is not set since the channel on the | |
2180 | * tracing registry side does not have this information. | |
2181 | */ | |
48842b30 | 2182 | |
fc34caaa | 2183 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 2184 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 2185 | |
fc34caaa | 2186 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
2187 | } |
2188 | ||
5b4a0ec0 DG |
2189 | /* |
2190 | * Copy data between a UST app session and a regular LTT session. | |
2191 | */ | |
421cb601 | 2192 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 2193 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 2194 | { |
477d7741 MD |
2195 | struct tm *timeinfo; |
2196 | char datetime[16]; | |
2197 | int ret; | |
d7ba1388 | 2198 | char tmp_shm_path[PATH_MAX]; |
477d7741 | 2199 | |
940c4592 | 2200 | timeinfo = localtime(&app->registration_time); |
477d7741 | 2201 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); |
48842b30 | 2202 | |
421cb601 | 2203 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 2204 | |
7972aab2 DG |
2205 | ua_sess->tracing_id = usess->id; |
2206 | ua_sess->id = get_next_session_id(); | |
2463b787 JR |
2207 | LTTNG_OPTIONAL_SET(&ua_sess->real_credentials.uid, app->uid); |
2208 | LTTNG_OPTIONAL_SET(&ua_sess->real_credentials.gid, app->gid); | |
2209 | LTTNG_OPTIONAL_SET(&ua_sess->effective_credentials.uid, usess->uid); | |
2210 | LTTNG_OPTIONAL_SET(&ua_sess->effective_credentials.gid, usess->gid); | |
7972aab2 DG |
2211 | ua_sess->buffer_type = usess->buffer_type; |
2212 | ua_sess->bits_per_long = app->bits_per_long; | |
6addfa37 | 2213 | |
7972aab2 | 2214 | /* There is only one consumer object per session possible. */ |
6addfa37 | 2215 | consumer_output_get(usess->consumer); |
7972aab2 | 2216 | ua_sess->consumer = usess->consumer; |
6addfa37 | 2217 | |
2bba9e53 | 2218 | ua_sess->output_traces = usess->output_traces; |
ecc48a90 | 2219 | ua_sess->live_timer_interval = usess->live_timer_interval; |
84ad93e8 DG |
2220 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, |
2221 | &usess->metadata_attr); | |
7972aab2 DG |
2222 | |
2223 | switch (ua_sess->buffer_type) { | |
2224 | case LTTNG_BUFFER_PER_PID: | |
2225 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 2226 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
2227 | datetime); |
2228 | break; | |
2229 | case LTTNG_BUFFER_PER_UID: | |
2230 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
470cc211 | 2231 | DEFAULT_UST_TRACE_UID_PATH, |
2463b787 | 2232 | lttng_credentials_get_uid(&ua_sess->real_credentials), |
470cc211 | 2233 | app->bits_per_long); |
7972aab2 DG |
2234 | break; |
2235 | default: | |
2236 | assert(0); | |
2237 | goto error; | |
2238 | } | |
477d7741 MD |
2239 | if (ret < 0) { |
2240 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 2241 | assert(0); |
7972aab2 | 2242 | goto error; |
477d7741 MD |
2243 | } |
2244 | ||
3d071855 MD |
2245 | strncpy(ua_sess->root_shm_path, usess->root_shm_path, |
2246 | sizeof(ua_sess->root_shm_path)); | |
2247 | ua_sess->root_shm_path[sizeof(ua_sess->root_shm_path) - 1] = '\0'; | |
d7ba1388 MD |
2248 | strncpy(ua_sess->shm_path, usess->shm_path, |
2249 | sizeof(ua_sess->shm_path)); | |
2250 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
2251 | if (ua_sess->shm_path[0]) { | |
2252 | switch (ua_sess->buffer_type) { | |
2253 | case LTTNG_BUFFER_PER_PID: | |
2254 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
5da88b0f | 2255 | "/" DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", |
d7ba1388 MD |
2256 | app->name, app->pid, datetime); |
2257 | break; | |
2258 | case LTTNG_BUFFER_PER_UID: | |
2259 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
5da88b0f | 2260 | "/" DEFAULT_UST_TRACE_UID_PATH, |
d7ba1388 MD |
2261 | app->uid, app->bits_per_long); |
2262 | break; | |
2263 | default: | |
2264 | assert(0); | |
2265 | goto error; | |
2266 | } | |
2267 | if (ret < 0) { | |
2268 | PERROR("sprintf UST shadow copy session"); | |
2269 | assert(0); | |
2270 | goto error; | |
2271 | } | |
2272 | strncat(ua_sess->shm_path, tmp_shm_path, | |
2273 | sizeof(ua_sess->shm_path) - strlen(ua_sess->shm_path) - 1); | |
2274 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
2275 | } | |
6addfa37 | 2276 | return; |
7972aab2 DG |
2277 | |
2278 | error: | |
6addfa37 | 2279 | consumer_output_put(ua_sess->consumer); |
48842b30 DG |
2280 | } |
2281 | ||
78f0bacd DG |
2282 | /* |
2283 | * Lookup sesison wrapper. | |
2284 | */ | |
84cd17c6 | 2285 | static |
fb9a95c4 | 2286 | void __lookup_session_by_app(const struct ltt_ust_session *usess, |
bec39940 | 2287 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
2288 | { |
2289 | /* Get right UST app session from app */ | |
d9bf3ca4 | 2290 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
2291 | } |
2292 | ||
421cb601 DG |
2293 | /* |
2294 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 2295 | * id. |
421cb601 | 2296 | */ |
48842b30 | 2297 | static struct ust_app_session *lookup_session_by_app( |
fb9a95c4 | 2298 | const struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 2299 | { |
bec39940 | 2300 | struct lttng_ht_iter iter; |
d9bf3ca4 | 2301 | struct lttng_ht_node_u64 *node; |
48842b30 | 2302 | |
84cd17c6 | 2303 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 2304 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
2305 | if (node == NULL) { |
2306 | goto error; | |
2307 | } | |
2308 | ||
2309 | return caa_container_of(node, struct ust_app_session, node); | |
2310 | ||
2311 | error: | |
2312 | return NULL; | |
2313 | } | |
2314 | ||
7972aab2 DG |
2315 | /* |
2316 | * Setup buffer registry per PID for the given session and application. If none | |
2317 | * is found, a new one is created, added to the global registry and | |
2318 | * initialized. If regp is valid, it's set with the newly created object. | |
2319 | * | |
2320 | * Return 0 on success or else a negative value. | |
2321 | */ | |
2322 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
2323 | struct ust_app *app, struct buffer_reg_pid **regp) | |
2324 | { | |
2325 | int ret = 0; | |
2326 | struct buffer_reg_pid *reg_pid; | |
2327 | ||
2328 | assert(ua_sess); | |
2329 | assert(app); | |
2330 | ||
2331 | rcu_read_lock(); | |
2332 | ||
2333 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
2334 | if (!reg_pid) { | |
2335 | /* | |
2336 | * This is the create channel path meaning that if there is NO | |
2337 | * registry available, we have to create one for this session. | |
2338 | */ | |
d7ba1388 | 2339 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid, |
3d071855 | 2340 | ua_sess->root_shm_path, ua_sess->shm_path); |
7972aab2 DG |
2341 | if (ret < 0) { |
2342 | goto error; | |
2343 | } | |
7972aab2 DG |
2344 | } else { |
2345 | goto end; | |
2346 | } | |
2347 | ||
2348 | /* Initialize registry. */ | |
2349 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
2350 | app->bits_per_long, app->uint8_t_alignment, | |
2351 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf | 2352 | app->uint64_t_alignment, app->long_alignment, |
470cc211 JG |
2353 | app->byte_order, app->version.major, app->version.minor, |
2354 | reg_pid->root_shm_path, reg_pid->shm_path, | |
2463b787 JR |
2355 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
2356 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
2357 | ua_sess->tracing_id, | |
8de88061 | 2358 | app->uid); |
7972aab2 | 2359 | if (ret < 0) { |
286c991a MD |
2360 | /* |
2361 | * reg_pid->registry->reg.ust is NULL upon error, so we need to | |
2362 | * destroy the buffer registry, because it is always expected | |
2363 | * that if the buffer registry can be found, its ust registry is | |
2364 | * non-NULL. | |
2365 | */ | |
2366 | buffer_reg_pid_destroy(reg_pid); | |
7972aab2 DG |
2367 | goto error; |
2368 | } | |
2369 | ||
286c991a MD |
2370 | buffer_reg_pid_add(reg_pid); |
2371 | ||
7972aab2 DG |
2372 | DBG3("UST app buffer registry per PID created successfully"); |
2373 | ||
2374 | end: | |
2375 | if (regp) { | |
2376 | *regp = reg_pid; | |
2377 | } | |
2378 | error: | |
2379 | rcu_read_unlock(); | |
2380 | return ret; | |
2381 | } | |
2382 | ||
2383 | /* | |
2384 | * Setup buffer registry per UID for the given session and application. If none | |
2385 | * is found, a new one is created, added to the global registry and | |
2386 | * initialized. If regp is valid, it's set with the newly created object. | |
2387 | * | |
2388 | * Return 0 on success or else a negative value. | |
2389 | */ | |
2390 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
d7ba1388 | 2391 | struct ust_app_session *ua_sess, |
7972aab2 DG |
2392 | struct ust_app *app, struct buffer_reg_uid **regp) |
2393 | { | |
2394 | int ret = 0; | |
2395 | struct buffer_reg_uid *reg_uid; | |
2396 | ||
2397 | assert(usess); | |
2398 | assert(app); | |
2399 | ||
2400 | rcu_read_lock(); | |
2401 | ||
2402 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2403 | if (!reg_uid) { | |
2404 | /* | |
2405 | * This is the create channel path meaning that if there is NO | |
2406 | * registry available, we have to create one for this session. | |
2407 | */ | |
2408 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
3d071855 MD |
2409 | LTTNG_DOMAIN_UST, ®_uid, |
2410 | ua_sess->root_shm_path, ua_sess->shm_path); | |
7972aab2 DG |
2411 | if (ret < 0) { |
2412 | goto error; | |
2413 | } | |
7972aab2 DG |
2414 | } else { |
2415 | goto end; | |
2416 | } | |
2417 | ||
2418 | /* Initialize registry. */ | |
af6142cf | 2419 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
2420 | app->bits_per_long, app->uint8_t_alignment, |
2421 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
2422 | app->uint64_t_alignment, app->long_alignment, |
2423 | app->byte_order, app->version.major, | |
3d071855 | 2424 | app->version.minor, reg_uid->root_shm_path, |
8de88061 JR |
2425 | reg_uid->shm_path, usess->uid, usess->gid, |
2426 | ua_sess->tracing_id, app->uid); | |
7972aab2 | 2427 | if (ret < 0) { |
286c991a MD |
2428 | /* |
2429 | * reg_uid->registry->reg.ust is NULL upon error, so we need to | |
2430 | * destroy the buffer registry, because it is always expected | |
2431 | * that if the buffer registry can be found, its ust registry is | |
2432 | * non-NULL. | |
2433 | */ | |
2434 | buffer_reg_uid_destroy(reg_uid, NULL); | |
7972aab2 DG |
2435 | goto error; |
2436 | } | |
2437 | /* Add node to teardown list of the session. */ | |
2438 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
2439 | ||
286c991a | 2440 | buffer_reg_uid_add(reg_uid); |
7972aab2 | 2441 | |
286c991a | 2442 | DBG3("UST app buffer registry per UID created successfully"); |
7972aab2 DG |
2443 | end: |
2444 | if (regp) { | |
2445 | *regp = reg_uid; | |
2446 | } | |
2447 | error: | |
2448 | rcu_read_unlock(); | |
2449 | return ret; | |
2450 | } | |
2451 | ||
421cb601 | 2452 | /* |
3d8ca23b | 2453 | * Create a session on the tracer side for the given app. |
421cb601 | 2454 | * |
3d8ca23b DG |
2455 | * On success, ua_sess_ptr is populated with the session pointer or else left |
2456 | * untouched. If the session was created, is_created is set to 1. On error, | |
2457 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
2458 | * be NULL. | |
2459 | * | |
2460 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
2461 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 2462 | */ |
03f91eaa | 2463 | static int find_or_create_ust_app_session(struct ltt_ust_session *usess, |
3d8ca23b DG |
2464 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, |
2465 | int *is_created) | |
421cb601 | 2466 | { |
3d8ca23b | 2467 | int ret, created = 0; |
421cb601 DG |
2468 | struct ust_app_session *ua_sess; |
2469 | ||
3d8ca23b DG |
2470 | assert(usess); |
2471 | assert(app); | |
2472 | assert(ua_sess_ptr); | |
2473 | ||
840cb59c | 2474 | health_code_update(); |
86acf0da | 2475 | |
421cb601 DG |
2476 | ua_sess = lookup_session_by_app(usess, app); |
2477 | if (ua_sess == NULL) { | |
d9bf3ca4 | 2478 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 2479 | app->pid, usess->id); |
40bbd087 | 2480 | ua_sess = alloc_ust_app_session(); |
421cb601 DG |
2481 | if (ua_sess == NULL) { |
2482 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
2483 | ret = -ENOMEM; |
2484 | goto error; | |
421cb601 | 2485 | } |
477d7741 | 2486 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 2487 | created = 1; |
421cb601 DG |
2488 | } |
2489 | ||
7972aab2 DG |
2490 | switch (usess->buffer_type) { |
2491 | case LTTNG_BUFFER_PER_PID: | |
2492 | /* Init local registry. */ | |
2493 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 2494 | if (ret < 0) { |
e64207cf | 2495 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2496 | goto error; |
2497 | } | |
2498 | break; | |
2499 | case LTTNG_BUFFER_PER_UID: | |
2500 | /* Look for a global registry. If none exists, create one. */ | |
d7ba1388 | 2501 | ret = setup_buffer_reg_uid(usess, ua_sess, app, NULL); |
7972aab2 | 2502 | if (ret < 0) { |
e64207cf | 2503 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2504 | goto error; |
2505 | } | |
2506 | break; | |
2507 | default: | |
2508 | assert(0); | |
2509 | ret = -EINVAL; | |
2510 | goto error; | |
2511 | } | |
2512 | ||
2513 | health_code_update(); | |
2514 | ||
2515 | if (ua_sess->handle == -1) { | |
fb45065e | 2516 | pthread_mutex_lock(&app->sock_lock); |
7972aab2 | 2517 | ret = ustctl_create_session(app->sock); |
fb45065e | 2518 | pthread_mutex_unlock(&app->sock_lock); |
7972aab2 DG |
2519 | if (ret < 0) { |
2520 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
2521 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
2522 | app->pid, ret); |
2523 | } else { | |
2524 | DBG("UST app creating session failed. Application is dead"); | |
3757b385 DG |
2525 | /* |
2526 | * This is normal behavior, an application can die during the | |
2527 | * creation process. Don't report an error so the execution can | |
2528 | * continue normally. This will get flagged ENOTCONN and the | |
2529 | * caller will handle it. | |
2530 | */ | |
2531 | ret = 0; | |
ffe60014 | 2532 | } |
d0b96690 | 2533 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
2534 | if (ret != -ENOMEM) { |
2535 | /* | |
2536 | * Tracer is probably gone or got an internal error so let's | |
2537 | * behave like it will soon unregister or not usable. | |
2538 | */ | |
2539 | ret = -ENOTCONN; | |
2540 | } | |
2541 | goto error; | |
421cb601 DG |
2542 | } |
2543 | ||
7972aab2 DG |
2544 | ua_sess->handle = ret; |
2545 | ||
2546 | /* Add ust app session to app's HT */ | |
d9bf3ca4 MD |
2547 | lttng_ht_node_init_u64(&ua_sess->node, |
2548 | ua_sess->tracing_id); | |
2549 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
10b56aef MD |
2550 | lttng_ht_node_init_ulong(&ua_sess->ust_objd_node, ua_sess->handle); |
2551 | lttng_ht_add_unique_ulong(app->ust_sessions_objd, | |
2552 | &ua_sess->ust_objd_node); | |
7972aab2 DG |
2553 | |
2554 | DBG2("UST app session created successfully with handle %d", ret); | |
2555 | } | |
2556 | ||
2557 | *ua_sess_ptr = ua_sess; | |
2558 | if (is_created) { | |
2559 | *is_created = created; | |
2560 | } | |
2561 | ||
2562 | /* Everything went well. */ | |
2563 | ret = 0; | |
2564 | ||
2565 | error: | |
2566 | health_code_update(); | |
2567 | return ret; | |
2568 | } | |
2569 | ||
6a6b2068 JG |
2570 | /* |
2571 | * Match function for a hash table lookup of ust_app_ctx. | |
2572 | * | |
2573 | * It matches an ust app context based on the context type and, in the case | |
2574 | * of perf counters, their name. | |
2575 | */ | |
2576 | static int ht_match_ust_app_ctx(struct cds_lfht_node *node, const void *_key) | |
2577 | { | |
2578 | struct ust_app_ctx *ctx; | |
bdf64013 | 2579 | const struct lttng_ust_context_attr *key; |
6a6b2068 JG |
2580 | |
2581 | assert(node); | |
2582 | assert(_key); | |
2583 | ||
2584 | ctx = caa_container_of(node, struct ust_app_ctx, node.node); | |
2585 | key = _key; | |
2586 | ||
2587 | /* Context type */ | |
2588 | if (ctx->ctx.ctx != key->ctx) { | |
2589 | goto no_match; | |
2590 | } | |
2591 | ||
bdf64013 JG |
2592 | switch(key->ctx) { |
2593 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: | |
6a6b2068 | 2594 | if (strncmp(key->u.perf_counter.name, |
bdf64013 JG |
2595 | ctx->ctx.u.perf_counter.name, |
2596 | sizeof(key->u.perf_counter.name))) { | |
2597 | goto no_match; | |
2598 | } | |
2599 | break; | |
2600 | case LTTNG_UST_CONTEXT_APP_CONTEXT: | |
2601 | if (strcmp(key->u.app_ctx.provider_name, | |
2602 | ctx->ctx.u.app_ctx.provider_name) || | |
2603 | strcmp(key->u.app_ctx.ctx_name, | |
2604 | ctx->ctx.u.app_ctx.ctx_name)) { | |
6a6b2068 JG |
2605 | goto no_match; |
2606 | } | |
bdf64013 JG |
2607 | break; |
2608 | default: | |
2609 | break; | |
6a6b2068 JG |
2610 | } |
2611 | ||
2612 | /* Match. */ | |
2613 | return 1; | |
2614 | ||
2615 | no_match: | |
2616 | return 0; | |
2617 | } | |
2618 | ||
2619 | /* | |
2620 | * Lookup for an ust app context from an lttng_ust_context. | |
2621 | * | |
be184a0f | 2622 | * Must be called while holding RCU read side lock. |
6a6b2068 JG |
2623 | * Return an ust_app_ctx object or NULL on error. |
2624 | */ | |
2625 | static | |
2626 | struct ust_app_ctx *find_ust_app_context(struct lttng_ht *ht, | |
bdf64013 | 2627 | struct lttng_ust_context_attr *uctx) |
6a6b2068 JG |
2628 | { |
2629 | struct lttng_ht_iter iter; | |
2630 | struct lttng_ht_node_ulong *node; | |
2631 | struct ust_app_ctx *app_ctx = NULL; | |
2632 | ||
2633 | assert(uctx); | |
2634 | assert(ht); | |
2635 | ||
2636 | /* Lookup using the lttng_ust_context_type and a custom match fct. */ | |
2637 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) uctx->ctx, lttng_ht_seed), | |
2638 | ht_match_ust_app_ctx, uctx, &iter.iter); | |
2639 | node = lttng_ht_iter_get_node_ulong(&iter); | |
2640 | if (!node) { | |
2641 | goto end; | |
2642 | } | |
2643 | ||
2644 | app_ctx = caa_container_of(node, struct ust_app_ctx, node); | |
2645 | ||
2646 | end: | |
2647 | return app_ctx; | |
2648 | } | |
2649 | ||
7972aab2 DG |
2650 | /* |
2651 | * Create a context for the channel on the tracer. | |
2652 | * | |
2653 | * Called with UST app session lock held and a RCU read side lock. | |
2654 | */ | |
2655 | static | |
c9edf082 | 2656 | int create_ust_app_channel_context(struct ust_app_channel *ua_chan, |
f3db82be | 2657 | struct lttng_ust_context_attr *uctx, |
7972aab2 DG |
2658 | struct ust_app *app) |
2659 | { | |
2660 | int ret = 0; | |
7972aab2 DG |
2661 | struct ust_app_ctx *ua_ctx; |
2662 | ||
2663 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
2664 | ||
6a6b2068 JG |
2665 | ua_ctx = find_ust_app_context(ua_chan->ctx, uctx); |
2666 | if (ua_ctx) { | |
7972aab2 DG |
2667 | ret = -EEXIST; |
2668 | goto error; | |
2669 | } | |
2670 | ||
2671 | ua_ctx = alloc_ust_app_ctx(uctx); | |
2672 | if (ua_ctx == NULL) { | |
2673 | /* malloc failed */ | |
7682f304 | 2674 | ret = -ENOMEM; |
7972aab2 DG |
2675 | goto error; |
2676 | } | |
2677 | ||
2678 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 2679 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 2680 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
2681 | |
2682 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
2683 | if (ret < 0) { | |
2684 | goto error; | |
2685 | } | |
2686 | ||
2687 | error: | |
2688 | return ret; | |
2689 | } | |
2690 | ||
2691 | /* | |
2692 | * Enable on the tracer side a ust app event for the session and channel. | |
2693 | * | |
2694 | * Called with UST app session lock held. | |
2695 | */ | |
2696 | static | |
2697 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
2698 | struct ust_app_event *ua_event, struct ust_app *app) | |
2699 | { | |
2700 | int ret; | |
2701 | ||
2463b787 | 2702 | ret = enable_ust_object(app, ua_event->obj); |
7972aab2 DG |
2703 | if (ret < 0) { |
2704 | goto error; | |
2705 | } | |
2706 | ||
2707 | ua_event->enabled = 1; | |
2708 | ||
2709 | error: | |
2710 | return ret; | |
2711 | } | |
2712 | ||
2713 | /* | |
2714 | * Disable on the tracer side a ust app event for the session and channel. | |
2715 | */ | |
2716 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
2717 | struct ust_app_event *ua_event, struct ust_app *app) | |
2718 | { | |
2719 | int ret; | |
2720 | ||
2463b787 | 2721 | ret = disable_ust_object(app, ua_event->obj); |
7972aab2 DG |
2722 | if (ret < 0) { |
2723 | goto error; | |
2724 | } | |
2725 | ||
2726 | ua_event->enabled = 0; | |
2727 | ||
2728 | error: | |
2729 | return ret; | |
2730 | } | |
2731 | ||
2732 | /* | |
2733 | * Lookup ust app channel for session and disable it on the tracer side. | |
2734 | */ | |
2735 | static | |
2736 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
2737 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
2738 | { | |
2739 | int ret; | |
2740 | ||
2741 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2742 | if (ret < 0) { | |
2743 | goto error; | |
2744 | } | |
2745 | ||
2746 | ua_chan->enabled = 0; | |
2747 | ||
2748 | error: | |
2749 | return ret; | |
2750 | } | |
2751 | ||
2752 | /* | |
2753 | * Lookup ust app channel for session and enable it on the tracer side. This | |
2754 | * MUST be called with a RCU read side lock acquired. | |
2755 | */ | |
2756 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
2757 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
2758 | { | |
2759 | int ret = 0; | |
2760 | struct lttng_ht_iter iter; | |
2761 | struct lttng_ht_node_str *ua_chan_node; | |
2762 | struct ust_app_channel *ua_chan; | |
2763 | ||
2764 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
2765 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
2766 | if (ua_chan_node == NULL) { | |
d9bf3ca4 | 2767 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
2768 | uchan->name, ua_sess->tracing_id); |
2769 | goto error; | |
2770 | } | |
2771 | ||
2772 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2773 | ||
2774 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
2775 | if (ret < 0) { | |
2776 | goto error; | |
2777 | } | |
2778 | ||
2779 | error: | |
2780 | return ret; | |
2781 | } | |
2782 | ||
2783 | /* | |
2784 | * Ask the consumer to create a channel and get it if successful. | |
2785 | * | |
fad1ed2f JR |
2786 | * Called with UST app session lock held. |
2787 | * | |
7972aab2 DG |
2788 | * Return 0 on success or else a negative value. |
2789 | */ | |
2790 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
2791 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
e098433c JG |
2792 | int bitness, struct ust_registry_session *registry, |
2793 | uint64_t trace_archive_id) | |
7972aab2 DG |
2794 | { |
2795 | int ret; | |
2796 | unsigned int nb_fd = 0; | |
2797 | struct consumer_socket *socket; | |
2798 | ||
2799 | assert(usess); | |
2800 | assert(ua_sess); | |
2801 | assert(ua_chan); | |
2802 | assert(registry); | |
2803 | ||
2804 | rcu_read_lock(); | |
2805 | health_code_update(); | |
2806 | ||
2807 | /* Get the right consumer socket for the application. */ | |
2808 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
2809 | if (!socket) { | |
2810 | ret = -EINVAL; | |
2811 | goto error; | |
2812 | } | |
2813 | ||
2814 | health_code_update(); | |
2815 | ||
2816 | /* Need one fd for the channel. */ | |
2817 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2818 | if (ret < 0) { | |
2819 | ERR("Exhausted number of available FD upon create channel"); | |
2820 | goto error; | |
2821 | } | |
2822 | ||
2823 | /* | |
2824 | * Ask consumer to create channel. The consumer will return the number of | |
2825 | * stream we have to expect. | |
2826 | */ | |
2827 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
d2956687 | 2828 | registry, usess->current_trace_chunk); |
7972aab2 DG |
2829 | if (ret < 0) { |
2830 | goto error_ask; | |
2831 | } | |
2832 | ||
2833 | /* | |
2834 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2835 | * stream (2 being the default value here). | |
2836 | */ | |
2837 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2838 | ||
2839 | /* Reserve the amount of file descriptor we need. */ | |
2840 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2841 | if (ret < 0) { | |
2842 | ERR("Exhausted number of available FD upon create channel"); | |
2843 | goto error_fd_get_stream; | |
2844 | } | |
2845 | ||
2846 | health_code_update(); | |
2847 | ||
2848 | /* | |
2849 | * Now get the channel from the consumer. This call wil populate the stream | |
2850 | * list of that channel and set the ust objects. | |
2851 | */ | |
d9078d0c DG |
2852 | if (usess->consumer->enabled) { |
2853 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2854 | if (ret < 0) { | |
2855 | goto error_destroy; | |
2856 | } | |
7972aab2 DG |
2857 | } |
2858 | ||
2859 | rcu_read_unlock(); | |
2860 | return 0; | |
2861 | ||
2862 | error_destroy: | |
2863 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2864 | error_fd_get_stream: | |
2865 | /* | |
2866 | * Initiate a destroy channel on the consumer since we had an error | |
2867 | * handling it on our side. The return value is of no importance since we | |
2868 | * already have a ret value set by the previous error that we need to | |
2869 | * return. | |
2870 | */ | |
2871 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2872 | error_ask: | |
2873 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2874 | error: | |
2875 | health_code_update(); | |
2876 | rcu_read_unlock(); | |
2877 | return ret; | |
2878 | } | |
2879 | ||
2880 | /* | |
2881 | * Duplicate the ust data object of the ust app stream and save it in the | |
2882 | * buffer registry stream. | |
2883 | * | |
2884 | * Return 0 on success or else a negative value. | |
2885 | */ | |
2886 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2887 | struct ust_app_stream *stream) | |
2888 | { | |
2889 | int ret; | |
2890 | ||
2891 | assert(reg_stream); | |
2892 | assert(stream); | |
2893 | ||
2894 | /* Reserve the amount of file descriptor we need. */ | |
2895 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2896 | if (ret < 0) { | |
2897 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2898 | goto error; | |
2899 | } | |
2900 | ||
2901 | /* Duplicate object for stream once the original is in the registry. */ | |
2902 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2903 | reg_stream->obj.ust); | |
2904 | if (ret < 0) { | |
2905 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2906 | reg_stream->obj.ust, stream->obj, ret); | |
2907 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2908 | goto error; | |
2909 | } | |
2910 | stream->handle = stream->obj->handle; | |
2911 | ||
2912 | error: | |
2913 | return ret; | |
2914 | } | |
2915 | ||
2916 | /* | |
2917 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2918 | * buffer registry channel. | |
2919 | * | |
2920 | * Return 0 on success or else a negative value. | |
2921 | */ | |
2922 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2923 | struct ust_app_channel *ua_chan) | |
2924 | { | |
2925 | int ret; | |
2926 | ||
2927 | assert(reg_chan); | |
2928 | assert(ua_chan); | |
2929 | ||
2930 | /* Need two fds for the channel. */ | |
2931 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2932 | if (ret < 0) { | |
2933 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2934 | goto error_fd_get; | |
2935 | } | |
2936 | ||
2937 | /* Duplicate object for stream once the original is in the registry. */ | |
2938 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2939 | if (ret < 0) { | |
2940 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2941 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2942 | goto error; | |
2943 | } | |
2944 | ua_chan->handle = ua_chan->obj->handle; | |
2945 | ||
2946 | return 0; | |
2947 | ||
2948 | error: | |
2949 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2950 | error_fd_get: | |
2951 | return ret; | |
2952 | } | |
2953 | ||
2954 | /* | |
2955 | * For a given channel buffer registry, setup all streams of the given ust | |
2956 | * application channel. | |
2957 | * | |
2958 | * Return 0 on success or else a negative value. | |
2959 | */ | |
2960 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
fb45065e MD |
2961 | struct ust_app_channel *ua_chan, |
2962 | struct ust_app *app) | |
7972aab2 DG |
2963 | { |
2964 | int ret = 0; | |
2965 | struct ust_app_stream *stream, *stmp; | |
2966 | ||
2967 | assert(reg_chan); | |
2968 | assert(ua_chan); | |
2969 | ||
2970 | DBG2("UST app setup buffer registry stream"); | |
2971 | ||
2972 | /* Send all streams to application. */ | |
2973 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2974 | struct buffer_reg_stream *reg_stream; | |
2975 | ||
2976 | ret = buffer_reg_stream_create(®_stream); | |
2977 | if (ret < 0) { | |
2978 | goto error; | |
2979 | } | |
2980 | ||
2981 | /* | |
2982 | * Keep original pointer and nullify it in the stream so the delete | |
2983 | * stream call does not release the object. | |
2984 | */ | |
2985 | reg_stream->obj.ust = stream->obj; | |
2986 | stream->obj = NULL; | |
2987 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2988 | |
7972aab2 DG |
2989 | /* We don't need the streams anymore. */ |
2990 | cds_list_del(&stream->list); | |
fb45065e | 2991 | delete_ust_app_stream(-1, stream, app); |
7972aab2 | 2992 | } |
421cb601 | 2993 | |
7972aab2 DG |
2994 | error: |
2995 | return ret; | |
2996 | } | |
2997 | ||
2998 | /* | |
2999 | * Create a buffer registry channel for the given session registry and | |
3000 | * application channel object. If regp pointer is valid, it's set with the | |
3001 | * created object. Important, the created object is NOT added to the session | |
3002 | * registry hash table. | |
3003 | * | |
3004 | * Return 0 on success else a negative value. | |
3005 | */ | |
3006 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
3007 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
3008 | { | |
3009 | int ret; | |
3010 | struct buffer_reg_channel *reg_chan = NULL; | |
3011 | ||
3012 | assert(reg_sess); | |
3013 | assert(ua_chan); | |
3014 | ||
3015 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
3016 | ||
3017 | /* Create buffer registry channel. */ | |
3018 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
3019 | if (ret < 0) { | |
3020 | goto error_create; | |
421cb601 | 3021 | } |
7972aab2 DG |
3022 | assert(reg_chan); |
3023 | reg_chan->consumer_key = ua_chan->key; | |
8c924c7b | 3024 | reg_chan->subbuf_size = ua_chan->attr.subbuf_size; |
d07ceecd | 3025 | reg_chan->num_subbuf = ua_chan->attr.num_subbuf; |
421cb601 | 3026 | |
7972aab2 DG |
3027 | /* Create and add a channel registry to session. */ |
3028 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
3029 | ua_chan->tracing_channel_id); | |
3030 | if (ret < 0) { | |
3031 | goto error; | |
d88aee68 | 3032 | } |
7972aab2 | 3033 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 3034 | |
7972aab2 DG |
3035 | if (regp) { |
3036 | *regp = reg_chan; | |
3d8ca23b | 3037 | } |
d88aee68 | 3038 | |
7972aab2 | 3039 | return 0; |
3d8ca23b DG |
3040 | |
3041 | error: | |
7972aab2 DG |
3042 | /* Safe because the registry channel object was not added to any HT. */ |
3043 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
3044 | error_create: | |
3d8ca23b | 3045 | return ret; |
421cb601 DG |
3046 | } |
3047 | ||
55cc08a6 | 3048 | /* |
7972aab2 DG |
3049 | * Setup buffer registry channel for the given session registry and application |
3050 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 3051 | * |
7972aab2 | 3052 | * Return 0 on success else a negative value. |
55cc08a6 | 3053 | */ |
7972aab2 | 3054 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
fb45065e MD |
3055 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan, |
3056 | struct ust_app *app) | |
55cc08a6 | 3057 | { |
7972aab2 | 3058 | int ret; |
55cc08a6 | 3059 | |
7972aab2 DG |
3060 | assert(reg_sess); |
3061 | assert(reg_chan); | |
3062 | assert(ua_chan); | |
3063 | assert(ua_chan->obj); | |
55cc08a6 | 3064 | |
7972aab2 | 3065 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 3066 | |
7972aab2 | 3067 | /* Setup all streams for the registry. */ |
fb45065e | 3068 | ret = setup_buffer_reg_streams(reg_chan, ua_chan, app); |
7972aab2 | 3069 | if (ret < 0) { |
55cc08a6 DG |
3070 | goto error; |
3071 | } | |
3072 | ||
7972aab2 DG |
3073 | reg_chan->obj.ust = ua_chan->obj; |
3074 | ua_chan->obj = NULL; | |
55cc08a6 | 3075 | |
7972aab2 | 3076 | return 0; |
55cc08a6 DG |
3077 | |
3078 | error: | |
7972aab2 DG |
3079 | buffer_reg_channel_remove(reg_sess, reg_chan); |
3080 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
3081 | return ret; |
3082 | } | |
3083 | ||
edb67388 | 3084 | /* |
7972aab2 | 3085 | * Send buffer registry channel to the application. |
d0b96690 | 3086 | * |
7972aab2 | 3087 | * Return 0 on success else a negative value. |
edb67388 | 3088 | */ |
7972aab2 DG |
3089 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
3090 | struct ust_app *app, struct ust_app_session *ua_sess, | |
3091 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
3092 | { |
3093 | int ret; | |
7972aab2 | 3094 | struct buffer_reg_stream *reg_stream; |
edb67388 | 3095 | |
7972aab2 DG |
3096 | assert(reg_chan); |
3097 | assert(app); | |
3098 | assert(ua_sess); | |
3099 | assert(ua_chan); | |
3100 | ||
3101 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
3102 | ||
3103 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
3104 | if (ret < 0) { |
3105 | goto error; | |
3106 | } | |
3107 | ||
7972aab2 DG |
3108 | /* Send channel to the application. */ |
3109 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
3110 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
3111 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
3112 | goto error; | |
3113 | } else if (ret < 0) { | |
7972aab2 DG |
3114 | goto error; |
3115 | } | |
3116 | ||
3117 | health_code_update(); | |
3118 | ||
3119 | /* Send all streams to application. */ | |
3120 | pthread_mutex_lock(®_chan->stream_list_lock); | |
3121 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
3122 | struct ust_app_stream stream; | |
3123 | ||
3124 | ret = duplicate_stream_object(reg_stream, &stream); | |
3125 | if (ret < 0) { | |
3126 | goto error_stream_unlock; | |
3127 | } | |
3128 | ||
3129 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
3130 | if (ret < 0) { | |
fb45065e | 3131 | (void) release_ust_app_stream(-1, &stream, app); |
a7169585 MD |
3132 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
3133 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
a7169585 | 3134 | } |
7972aab2 DG |
3135 | goto error_stream_unlock; |
3136 | } | |
edb67388 | 3137 | |
7972aab2 DG |
3138 | /* |
3139 | * The return value is not important here. This function will output an | |
3140 | * error if needed. | |
3141 | */ | |
fb45065e | 3142 | (void) release_ust_app_stream(-1, &stream, app); |
7972aab2 DG |
3143 | } |
3144 | ua_chan->is_sent = 1; | |
3145 | ||
3146 | error_stream_unlock: | |
3147 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
3148 | error: |
3149 | return ret; | |
3150 | } | |
3151 | ||
9730260e | 3152 | /* |
7972aab2 DG |
3153 | * Create and send to the application the created buffers with per UID buffers. |
3154 | * | |
9acdc1d6 | 3155 | * This MUST be called with a RCU read side lock acquired. |
71e0a100 | 3156 | * The session list lock and the session's lock must be acquired. |
9acdc1d6 | 3157 | * |
7972aab2 | 3158 | * Return 0 on success else a negative value. |
9730260e | 3159 | */ |
7972aab2 DG |
3160 | static int create_channel_per_uid(struct ust_app *app, |
3161 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
3162 | struct ust_app_channel *ua_chan) | |
9730260e DG |
3163 | { |
3164 | int ret; | |
7972aab2 DG |
3165 | struct buffer_reg_uid *reg_uid; |
3166 | struct buffer_reg_channel *reg_chan; | |
e32d7f27 | 3167 | struct ltt_session *session = NULL; |
e098433c JG |
3168 | enum lttng_error_code notification_ret; |
3169 | struct ust_registry_channel *chan_reg; | |
9730260e | 3170 | |
7972aab2 DG |
3171 | assert(app); |
3172 | assert(usess); | |
3173 | assert(ua_sess); | |
3174 | assert(ua_chan); | |
3175 | ||
3176 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
3177 | ||
3178 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
3179 | /* | |
3180 | * The session creation handles the creation of this global registry | |
3181 | * object. If none can be find, there is a code flow problem or a | |
3182 | * teardown race. | |
3183 | */ | |
3184 | assert(reg_uid); | |
3185 | ||
3186 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
3187 | reg_uid); | |
2721f7ea JG |
3188 | if (reg_chan) { |
3189 | goto send_channel; | |
3190 | } | |
7972aab2 | 3191 | |
2721f7ea JG |
3192 | /* Create the buffer registry channel object. */ |
3193 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
3194 | if (ret < 0) { | |
3195 | ERR("Error creating the UST channel \"%s\" registry instance", | |
f14256d6 | 3196 | ua_chan->name); |
2721f7ea JG |
3197 | goto error; |
3198 | } | |
f14256d6 | 3199 | |
e098433c JG |
3200 | session = session_find_by_id(ua_sess->tracing_id); |
3201 | assert(session); | |
3202 | assert(pthread_mutex_trylock(&session->lock)); | |
3203 | assert(session_trylock_list()); | |
3204 | ||
2721f7ea JG |
3205 | /* |
3206 | * Create the buffers on the consumer side. This call populates the | |
3207 | * ust app channel object with all streams and data object. | |
3208 | */ | |
3209 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
e098433c | 3210 | app->bits_per_long, reg_uid->registry->reg.ust, |
d2956687 | 3211 | session->most_recent_chunk_id.value); |
2721f7ea JG |
3212 | if (ret < 0) { |
3213 | ERR("Error creating UST channel \"%s\" on the consumer daemon", | |
3214 | ua_chan->name); | |
7972aab2 DG |
3215 | |
3216 | /* | |
2721f7ea JG |
3217 | * Let's remove the previously created buffer registry channel so |
3218 | * it's not visible anymore in the session registry. | |
7972aab2 | 3219 | */ |
2721f7ea JG |
3220 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, |
3221 | ua_chan->tracing_channel_id, false); | |
3222 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
3223 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
3224 | goto error; | |
7972aab2 DG |
3225 | } |
3226 | ||
2721f7ea JG |
3227 | /* |
3228 | * Setup the streams and add it to the session registry. | |
3229 | */ | |
3230 | ret = setup_buffer_reg_channel(reg_uid->registry, | |
3231 | ua_chan, reg_chan, app); | |
3232 | if (ret < 0) { | |
3233 | ERR("Error setting up UST channel \"%s\"", ua_chan->name); | |
3234 | goto error; | |
3235 | } | |
3236 | ||
e098433c JG |
3237 | /* Notify the notification subsystem of the channel's creation. */ |
3238 | pthread_mutex_lock(®_uid->registry->reg.ust->lock); | |
3239 | chan_reg = ust_registry_channel_find(reg_uid->registry->reg.ust, | |
3240 | ua_chan->tracing_channel_id); | |
3241 | assert(chan_reg); | |
3242 | chan_reg->consumer_key = ua_chan->key; | |
3243 | chan_reg = NULL; | |
3244 | pthread_mutex_unlock(®_uid->registry->reg.ust->lock); | |
e9404c27 | 3245 | |
e098433c JG |
3246 | notification_ret = notification_thread_command_add_channel( |
3247 | notification_thread_handle, session->name, | |
2463b787 JR |
3248 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
3249 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
3250 | ua_chan->name, | |
470cc211 | 3251 | ua_chan->key, LTTNG_DOMAIN_UST, |
e098433c JG |
3252 | ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf); |
3253 | if (notification_ret != LTTNG_OK) { | |
3254 | ret = - (int) notification_ret; | |
3255 | ERR("Failed to add channel to notification thread"); | |
3256 | goto error; | |
e9404c27 JG |
3257 | } |
3258 | ||
2721f7ea | 3259 | send_channel: |
66ff8e3f JG |
3260 | /* Send buffers to the application. */ |
3261 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
3262 | if (ret < 0) { | |
3263 | if (ret != -ENOTCONN) { | |
3264 | ERR("Error sending channel to application"); | |
3265 | } | |
3266 | goto error; | |
3267 | } | |
3268 | ||
9730260e | 3269 | error: |
e32d7f27 JG |
3270 | if (session) { |
3271 | session_put(session); | |
3272 | } | |
9730260e DG |
3273 | return ret; |
3274 | } | |
3275 | ||
78f0bacd | 3276 | /* |
7972aab2 DG |
3277 | * Create and send to the application the created buffers with per PID buffers. |
3278 | * | |
fad1ed2f | 3279 | * Called with UST app session lock held. |
71e0a100 | 3280 | * The session list lock and the session's lock must be acquired. |
fad1ed2f | 3281 | * |
7972aab2 | 3282 | * Return 0 on success else a negative value. |
78f0bacd | 3283 | */ |
7972aab2 DG |
3284 | static int create_channel_per_pid(struct ust_app *app, |
3285 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
3286 | struct ust_app_channel *ua_chan) | |
78f0bacd | 3287 | { |
8535a6d9 | 3288 | int ret; |
7972aab2 | 3289 | struct ust_registry_session *registry; |
e9404c27 | 3290 | enum lttng_error_code cmd_ret; |
e32d7f27 | 3291 | struct ltt_session *session = NULL; |
e9404c27 JG |
3292 | uint64_t chan_reg_key; |
3293 | struct ust_registry_channel *chan_reg; | |
78f0bacd | 3294 | |
7972aab2 DG |
3295 | assert(app); |
3296 | assert(usess); | |
3297 | assert(ua_sess); | |
3298 | assert(ua_chan); | |
3299 | ||
3300 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
3301 | ||
3302 | rcu_read_lock(); | |
3303 | ||
3304 | registry = get_session_registry(ua_sess); | |
fad1ed2f | 3305 | /* The UST app session lock is held, registry shall not be null. */ |
7972aab2 DG |
3306 | assert(registry); |
3307 | ||
3308 | /* Create and add a new channel registry to session. */ | |
3309 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd | 3310 | if (ret < 0) { |
f14256d6 MD |
3311 | ERR("Error creating the UST channel \"%s\" registry instance", |
3312 | ua_chan->name); | |
78f0bacd DG |
3313 | goto error; |
3314 | } | |
3315 | ||
e098433c JG |
3316 | session = session_find_by_id(ua_sess->tracing_id); |
3317 | assert(session); | |
3318 | ||
3319 | assert(pthread_mutex_trylock(&session->lock)); | |
3320 | assert(session_trylock_list()); | |
3321 | ||
7972aab2 DG |
3322 | /* Create and get channel on the consumer side. */ |
3323 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
e098433c | 3324 | app->bits_per_long, registry, |
d2956687 | 3325 | session->most_recent_chunk_id.value); |
7972aab2 | 3326 | if (ret < 0) { |
f14256d6 MD |
3327 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
3328 | ua_chan->name); | |
5b951542 | 3329 | goto error_remove_from_registry; |
7972aab2 DG |
3330 | } |
3331 | ||
3332 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
3333 | if (ret < 0) { | |
a7169585 MD |
3334 | if (ret != -ENOTCONN) { |
3335 | ERR("Error sending channel to application"); | |
3336 | } | |
5b951542 | 3337 | goto error_remove_from_registry; |
7972aab2 | 3338 | } |
8535a6d9 | 3339 | |
e9404c27 JG |
3340 | chan_reg_key = ua_chan->key; |
3341 | pthread_mutex_lock(®istry->lock); | |
3342 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
3343 | assert(chan_reg); | |
3344 | chan_reg->consumer_key = ua_chan->key; | |
3345 | pthread_mutex_unlock(®istry->lock); | |
3346 | ||
3347 | cmd_ret = notification_thread_command_add_channel( | |
3348 | notification_thread_handle, session->name, | |
2463b787 JR |
3349 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
3350 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
3351 | ua_chan->name, | |
470cc211 | 3352 | ua_chan->key, LTTNG_DOMAIN_UST, |
e9404c27 JG |
3353 | ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf); |
3354 | if (cmd_ret != LTTNG_OK) { | |
3355 | ret = - (int) cmd_ret; | |
3356 | ERR("Failed to add channel to notification thread"); | |
5b951542 | 3357 | goto error_remove_from_registry; |
e9404c27 JG |
3358 | } |
3359 | ||
5b951542 MD |
3360 | error_remove_from_registry: |
3361 | if (ret) { | |
3362 | ust_registry_channel_del_free(registry, ua_chan->key, false); | |
3363 | } | |
78f0bacd | 3364 | error: |
7972aab2 | 3365 | rcu_read_unlock(); |
e32d7f27 JG |
3366 | if (session) { |
3367 | session_put(session); | |
3368 | } | |
78f0bacd DG |
3369 | return ret; |
3370 | } | |
3371 | ||
3372 | /* | |
7972aab2 | 3373 | * From an already allocated ust app channel, create the channel buffers if |
88e3c2f5 | 3374 | * needed and send them to the application. This MUST be called with a RCU read |
7972aab2 DG |
3375 | * side lock acquired. |
3376 | * | |
fad1ed2f JR |
3377 | * Called with UST app session lock held. |
3378 | * | |
a7169585 MD |
3379 | * Return 0 on success or else a negative value. Returns -ENOTCONN if |
3380 | * the application exited concurrently. | |
78f0bacd | 3381 | */ |
88e3c2f5 | 3382 | static int ust_app_channel_send(struct ust_app *app, |
7972aab2 DG |
3383 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, |
3384 | struct ust_app_channel *ua_chan) | |
78f0bacd | 3385 | { |
7972aab2 | 3386 | int ret; |
78f0bacd | 3387 | |
7972aab2 DG |
3388 | assert(app); |
3389 | assert(usess); | |
88e3c2f5 | 3390 | assert(usess->active); |
7972aab2 DG |
3391 | assert(ua_sess); |
3392 | assert(ua_chan); | |
3393 | ||
3394 | /* Handle buffer type before sending the channel to the application. */ | |
3395 | switch (usess->buffer_type) { | |
3396 | case LTTNG_BUFFER_PER_UID: | |
3397 | { | |
3398 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
3399 | if (ret < 0) { | |
3400 | goto error; | |
3401 | } | |
3402 | break; | |
3403 | } | |
3404 | case LTTNG_BUFFER_PER_PID: | |
3405 | { | |
3406 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
3407 | if (ret < 0) { | |
3408 | goto error; | |
3409 | } | |
3410 | break; | |
3411 | } | |
3412 | default: | |
3413 | assert(0); | |
3414 | ret = -EINVAL; | |
78f0bacd DG |
3415 | goto error; |
3416 | } | |
3417 | ||
7972aab2 DG |
3418 | /* Initialize ust objd object using the received handle and add it. */ |
3419 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
3420 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 3421 | |
7972aab2 DG |
3422 | /* If channel is not enabled, disable it on the tracer */ |
3423 | if (!ua_chan->enabled) { | |
3424 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
3425 | if (ret < 0) { | |
3426 | goto error; | |
3427 | } | |
78f0bacd DG |
3428 | } |
3429 | ||
3430 | error: | |
3431 | return ret; | |
3432 | } | |
3433 | ||
284d8f55 | 3434 | /* |
88e3c2f5 | 3435 | * Create UST app channel and return it through ua_chanp if not NULL. |
d0b96690 | 3436 | * |
36b588ed | 3437 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 | 3438 | * |
88e3c2f5 | 3439 | * Return 0 on success or else a negative value. |
284d8f55 | 3440 | */ |
88e3c2f5 JG |
3441 | static int ust_app_channel_allocate(struct ust_app_session *ua_sess, |
3442 | struct ltt_ust_channel *uchan, | |
7972aab2 | 3443 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 3444 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
3445 | { |
3446 | int ret = 0; | |
bec39940 DG |
3447 | struct lttng_ht_iter iter; |
3448 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
3449 | struct ust_app_channel *ua_chan; |
3450 | ||
3451 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3452 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
3453 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 3454 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 3455 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 3456 | goto end; |
5b4a0ec0 DG |
3457 | } |
3458 | ||
d0b96690 | 3459 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
3460 | if (ua_chan == NULL) { |
3461 | /* Only malloc can fail here */ | |
4d710ac2 | 3462 | ret = -ENOMEM; |
88e3c2f5 | 3463 | goto error; |
fc34caaa DG |
3464 | } |
3465 | shadow_copy_channel(ua_chan, uchan); | |
3466 | ||
ffe60014 DG |
3467 | /* Set channel type. */ |
3468 | ua_chan->attr.type = type; | |
3469 | ||
d0b96690 DG |
3470 | /* Only add the channel if successful on the tracer side. */ |
3471 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
fc34caaa | 3472 | end: |
4d710ac2 DG |
3473 | if (ua_chanp) { |
3474 | *ua_chanp = ua_chan; | |
3475 | } | |
3476 | ||
3477 | /* Everything went well. */ | |
3478 | return 0; | |
5b4a0ec0 DG |
3479 | |
3480 | error: | |
4d710ac2 | 3481 | return ret; |
5b4a0ec0 DG |
3482 | } |
3483 | ||
3484 | /* | |
3485 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
3486 | * |
3487 | * Called with ust app session mutex held. | |
5b4a0ec0 | 3488 | */ |
edb67388 DG |
3489 | static |
3490 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
3491 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
3492 | struct ust_app *app) | |
284d8f55 | 3493 | { |
edb67388 | 3494 | int ret = 0; |
5b4a0ec0 | 3495 | struct ust_app_event *ua_event; |
284d8f55 | 3496 | |
edb67388 DG |
3497 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
3498 | if (ua_event == NULL) { | |
20533947 | 3499 | /* Only failure mode of alloc_ust_app_event(). */ |
edb67388 | 3500 | ret = -ENOMEM; |
fc34caaa | 3501 | goto end; |
5b4a0ec0 | 3502 | } |
edb67388 | 3503 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 3504 | |
edb67388 | 3505 | /* Create it on the tracer side */ |
5b4a0ec0 | 3506 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 3507 | if (ret < 0) { |
e9f11505 JG |
3508 | /* |
3509 | * Not found previously means that it does not exist on the | |
3510 | * tracer. If the application reports that the event existed, | |
3511 | * it means there is a bug in the sessiond or lttng-ust | |
3512 | * (or corruption, etc.) | |
3513 | */ | |
3514 | if (ret == -LTTNG_UST_ERR_EXIST) { | |
3515 | ERR("Tracer for application reported that an event being created already existed: " | |
3516 | "event_name = \"%s\", pid = %d, ppid = %d, uid = %d, gid = %d", | |
3517 | uevent->attr.name, | |
3518 | app->pid, app->ppid, app->uid, | |
3519 | app->gid); | |
3520 | } | |
284d8f55 DG |
3521 | goto error; |
3522 | } | |
3523 | ||
d0b96690 | 3524 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 3525 | |
fc34caaa | 3526 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 3527 | app->pid); |
7f79d3a1 | 3528 | |
edb67388 | 3529 | end: |
fc34caaa DG |
3530 | return ret; |
3531 | ||
5b4a0ec0 | 3532 | error: |
fc34caaa | 3533 | /* Valid. Calling here is already in a read side lock */ |
fb45065e | 3534 | delete_ust_app_event(-1, ua_event, app); |
edb67388 | 3535 | return ret; |
5b4a0ec0 DG |
3536 | } |
3537 | ||
2463b787 JR |
3538 | /* |
3539 | * Create UST app event and create it on the tracer side. | |
3540 | * | |
3541 | * Called with ust app session mutex held. | |
3542 | */ | |
3543 | static | |
3544 | int create_ust_app_token_event_rule(struct lttng_trigger *trigger, | |
3545 | struct ust_app *app) | |
3546 | { | |
3547 | int ret = 0; | |
3548 | struct ust_app_token_event_rule *ua_token; | |
3549 | ||
3550 | ua_token = alloc_ust_app_token_event_rule(trigger); | |
3551 | if (ua_token == NULL) { | |
3552 | ret = -ENOMEM; | |
3553 | goto end; | |
3554 | } | |
3555 | ||
3556 | /* Create it on the tracer side */ | |
3557 | ret = create_ust_token_event_rule(app, ua_token); | |
3558 | if (ret < 0) { | |
3559 | /* | |
3560 | * Not found previously means that it does not exist on the | |
3561 | * tracer. If the application reports that the event existed, | |
3562 | * it means there is a bug in the sessiond or lttng-ust | |
3563 | * (or corruption, etc.) | |
3564 | */ | |
3565 | if (ret == -LTTNG_UST_ERR_EXIST) { | |
3566 | ERR("Tracer for application reported that a token event rule being created already existed: " | |
3567 | "token = \"%" PRIu64 "\", pid = %d, ppid = %d, uid = %d, gid = %d", | |
3568 | lttng_trigger_get_tracer_token(trigger), | |
3569 | app->pid, app->ppid, app->uid, | |
3570 | app->gid); | |
3571 | } | |
3572 | goto error; | |
3573 | } | |
3574 | ||
3575 | lttng_ht_add_unique_u64(app->tokens_ht, &ua_token->node); | |
3576 | ||
3577 | DBG2("UST app create token event rule %" PRIu64 " for PID %d completed", lttng_trigger_get_tracer_token(trigger), | |
3578 | app->pid); | |
3579 | ||
3580 | goto end; | |
3581 | ||
3582 | error: | |
3583 | /* Valid. Calling here is already in a read side lock */ | |
3584 | delete_ust_app_token_event_rule(-1, ua_token, app); | |
3585 | end: | |
3586 | return ret; | |
3587 | } | |
3588 | ||
5b4a0ec0 DG |
3589 | /* |
3590 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 3591 | * |
7972aab2 | 3592 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
3593 | */ |
3594 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
ad7a9107 | 3595 | struct ust_app *app, struct consumer_output *consumer) |
5b4a0ec0 DG |
3596 | { |
3597 | int ret = 0; | |
ffe60014 | 3598 | struct ust_app_channel *metadata; |
d88aee68 | 3599 | struct consumer_socket *socket; |
7972aab2 | 3600 | struct ust_registry_session *registry; |
e32d7f27 | 3601 | struct ltt_session *session = NULL; |
5b4a0ec0 | 3602 | |
ffe60014 DG |
3603 | assert(ua_sess); |
3604 | assert(app); | |
d88aee68 | 3605 | assert(consumer); |
5b4a0ec0 | 3606 | |
7972aab2 | 3607 | registry = get_session_registry(ua_sess); |
fad1ed2f | 3608 | /* The UST app session is held registry shall not be null. */ |
7972aab2 DG |
3609 | assert(registry); |
3610 | ||
ce34fcd0 MD |
3611 | pthread_mutex_lock(®istry->lock); |
3612 | ||
1b532a60 DG |
3613 | /* Metadata already exists for this registry or it was closed previously */ |
3614 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
3615 | ret = 0; |
3616 | goto error; | |
5b4a0ec0 DG |
3617 | } |
3618 | ||
ffe60014 | 3619 | /* Allocate UST metadata */ |
d0b96690 | 3620 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
3621 | if (!metadata) { |
3622 | /* malloc() failed */ | |
3623 | ret = -ENOMEM; | |
3624 | goto error; | |
3625 | } | |
5b4a0ec0 | 3626 | |
ad7a9107 | 3627 | memcpy(&metadata->attr, &ua_sess->metadata_attr, sizeof(metadata->attr)); |
5b4a0ec0 | 3628 | |
7972aab2 DG |
3629 | /* Need one fd for the channel. */ |
3630 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
3631 | if (ret < 0) { | |
3632 | ERR("Exhausted number of available FD upon create metadata"); | |
3633 | goto error; | |
3634 | } | |
3635 | ||
4dc3dfc5 DG |
3636 | /* Get the right consumer socket for the application. */ |
3637 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
3638 | if (!socket) { | |
3639 | ret = -EINVAL; | |
3640 | goto error_consumer; | |
3641 | } | |
3642 | ||
331744e3 JD |
3643 | /* |
3644 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
3645 | * to the registry *before* we ask the consumer so we avoid the race of the | |
3646 | * consumer requesting the metadata and the ask_channel call on our side | |
3647 | * did not returned yet. | |
3648 | */ | |
3649 | registry->metadata_key = metadata->key; | |
3650 | ||
e098433c JG |
3651 | session = session_find_by_id(ua_sess->tracing_id); |
3652 | assert(session); | |
3653 | ||
3654 | assert(pthread_mutex_trylock(&session->lock)); | |
3655 | assert(session_trylock_list()); | |
3656 | ||
d88aee68 DG |
3657 | /* |
3658 | * Ask the metadata channel creation to the consumer. The metadata object | |
3659 | * will be created by the consumer and kept their. However, the stream is | |
3660 | * never added or monitored until we do a first push metadata to the | |
3661 | * consumer. | |
3662 | */ | |
7972aab2 | 3663 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
d2956687 | 3664 | registry, session->current_trace_chunk); |
d88aee68 | 3665 | if (ret < 0) { |
f2a444f1 DG |
3666 | /* Nullify the metadata key so we don't try to close it later on. */ |
3667 | registry->metadata_key = 0; | |
d88aee68 DG |
3668 | goto error_consumer; |
3669 | } | |
3670 | ||
3671 | /* | |
3672 | * The setup command will make the metadata stream be sent to the relayd, | |
3673 | * if applicable, and the thread managing the metadatas. This is important | |
3674 | * because after this point, if an error occurs, the only way the stream | |
3675 | * can be deleted is to be monitored in the consumer. | |
3676 | */ | |
7972aab2 | 3677 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 3678 | if (ret < 0) { |
f2a444f1 DG |
3679 | /* Nullify the metadata key so we don't try to close it later on. */ |
3680 | registry->metadata_key = 0; | |
d88aee68 | 3681 | goto error_consumer; |
5b4a0ec0 DG |
3682 | } |
3683 | ||
7972aab2 DG |
3684 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
3685 | metadata->key, app->pid); | |
5b4a0ec0 | 3686 | |
d88aee68 | 3687 | error_consumer: |
b80f0b6c | 3688 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 3689 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 3690 | error: |
ce34fcd0 | 3691 | pthread_mutex_unlock(®istry->lock); |
e32d7f27 JG |
3692 | if (session) { |
3693 | session_put(session); | |
3694 | } | |
ffe60014 | 3695 | return ret; |
5b4a0ec0 DG |
3696 | } |
3697 | ||
5b4a0ec0 | 3698 | /* |
d88aee68 DG |
3699 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
3700 | * acquired before calling this function. | |
5b4a0ec0 DG |
3701 | */ |
3702 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
3703 | { | |
d88aee68 | 3704 | struct ust_app *app = NULL; |
bec39940 DG |
3705 | struct lttng_ht_node_ulong *node; |
3706 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 3707 | |
bec39940 DG |
3708 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
3709 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
3710 | if (node == NULL) { |
3711 | DBG2("UST app no found with pid %d", pid); | |
3712 | goto error; | |
3713 | } | |
5b4a0ec0 DG |
3714 | |
3715 | DBG2("Found UST app by pid %d", pid); | |
3716 | ||
d88aee68 | 3717 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
3718 | |
3719 | error: | |
d88aee68 | 3720 | return app; |
5b4a0ec0 DG |
3721 | } |
3722 | ||
d88aee68 DG |
3723 | /* |
3724 | * Allocate and init an UST app object using the registration information and | |
3725 | * the command socket. This is called when the command socket connects to the | |
3726 | * session daemon. | |
3727 | * | |
3728 | * The object is returned on success or else NULL. | |
3729 | */ | |
d0b96690 | 3730 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 3731 | { |
d0b96690 | 3732 | struct ust_app *lta = NULL; |
2463b787 | 3733 | struct lttng_pipe *trigger_event_source_pipe = NULL; |
d0b96690 DG |
3734 | |
3735 | assert(msg); | |
3736 | assert(sock >= 0); | |
3737 | ||
3738 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 3739 | |
173af62f DG |
3740 | if ((msg->bits_per_long == 64 && |
3741 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
3742 | || (msg->bits_per_long == 32 && | |
3743 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 3744 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
3745 | "%d-bit long, but no consumerd for this size is available.\n", |
3746 | msg->name, msg->pid, msg->bits_per_long); | |
3747 | goto error; | |
3f2c5fcc | 3748 | } |
d0b96690 | 3749 | |
2463b787 JR |
3750 | trigger_event_source_pipe = lttng_pipe_open(FD_CLOEXEC); |
3751 | if (!trigger_event_source_pipe) { | |
3752 | PERROR("Open trigger pipe"); | |
3753 | goto error; | |
3754 | } | |
3755 | ||
5b4a0ec0 DG |
3756 | lta = zmalloc(sizeof(struct ust_app)); |
3757 | if (lta == NULL) { | |
3758 | PERROR("malloc"); | |
d0b96690 | 3759 | goto error; |
5b4a0ec0 DG |
3760 | } |
3761 | ||
2463b787 JR |
3762 | lta->token_communication.trigger_event_pipe = trigger_event_source_pipe; |
3763 | ||
5b4a0ec0 DG |
3764 | lta->ppid = msg->ppid; |
3765 | lta->uid = msg->uid; | |
3766 | lta->gid = msg->gid; | |
d0b96690 | 3767 | |
7753dea8 | 3768 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
3769 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
3770 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
3771 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
3772 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
3773 | lta->long_alignment = msg->long_alignment; | |
3774 | lta->byte_order = msg->byte_order; | |
3775 | ||
5b4a0ec0 DG |
3776 | lta->v_major = msg->major; |
3777 | lta->v_minor = msg->minor; | |
d9bf3ca4 | 3778 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 | 3779 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
10b56aef | 3780 | lta->ust_sessions_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3781 | lta->notify_sock = -1; |
2463b787 | 3782 | lta->tokens_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d88aee68 DG |
3783 | |
3784 | /* Copy name and make sure it's NULL terminated. */ | |
3785 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
3786 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
3787 | ||
3788 | /* | |
3789 | * Before this can be called, when receiving the registration information, | |
3790 | * the application compatibility is checked. So, at this point, the | |
3791 | * application can work with this session daemon. | |
3792 | */ | |
d0b96690 | 3793 | lta->compatible = 1; |
5b4a0ec0 | 3794 | |
852d0037 | 3795 | lta->pid = msg->pid; |
d0b96690 | 3796 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 3797 | lta->sock = sock; |
fb45065e | 3798 | pthread_mutex_init(<a->sock_lock, NULL); |
d0b96690 | 3799 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 3800 | |
d42f20df | 3801 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
d0b96690 DG |
3802 | error: |
3803 | return lta; | |
3804 | } | |
3805 | ||
d88aee68 DG |
3806 | /* |
3807 | * For a given application object, add it to every hash table. | |
3808 | */ | |
d0b96690 DG |
3809 | void ust_app_add(struct ust_app *app) |
3810 | { | |
3811 | assert(app); | |
3812 | assert(app->notify_sock >= 0); | |
3813 | ||
940c4592 JR |
3814 | app->registration_time = time(NULL); |
3815 | ||
5b4a0ec0 | 3816 | rcu_read_lock(); |
852d0037 DG |
3817 | |
3818 | /* | |
3819 | * On a re-registration, we want to kick out the previous registration of | |
3820 | * that pid | |
3821 | */ | |
d0b96690 | 3822 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
3823 | |
3824 | /* | |
3825 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
3826 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
3827 | * already in the table. | |
3828 | */ | |
d0b96690 | 3829 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 3830 | |
d0b96690 DG |
3831 | /* Add application to the notify socket hash table. */ |
3832 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
3833 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 3834 | |
d0b96690 | 3835 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
3836 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
3837 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
3838 | app->v_minor); | |
5b4a0ec0 | 3839 | |
d0b96690 DG |
3840 | rcu_read_unlock(); |
3841 | } | |
3842 | ||
d88aee68 DG |
3843 | /* |
3844 | * Set the application version into the object. | |
3845 | * | |
3846 | * Return 0 on success else a negative value either an errno code or a | |
3847 | * LTTng-UST error code. | |
3848 | */ | |
d0b96690 DG |
3849 | int ust_app_version(struct ust_app *app) |
3850 | { | |
d88aee68 DG |
3851 | int ret; |
3852 | ||
d0b96690 | 3853 | assert(app); |
d88aee68 | 3854 | |
fb45065e | 3855 | pthread_mutex_lock(&app->sock_lock); |
d88aee68 | 3856 | ret = ustctl_tracer_version(app->sock, &app->version); |
fb45065e | 3857 | pthread_mutex_unlock(&app->sock_lock); |
d88aee68 DG |
3858 | if (ret < 0) { |
3859 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
5368d366 | 3860 | ERR("UST app %d version failed with ret %d", app->sock, ret); |
d88aee68 | 3861 | } else { |
5368d366 | 3862 | DBG3("UST app %d version failed. Application is dead", app->sock); |
d88aee68 DG |
3863 | } |
3864 | } | |
3865 | ||
3866 | return ret; | |
5b4a0ec0 DG |
3867 | } |
3868 | ||
2463b787 JR |
3869 | /* |
3870 | * Setup the base trigger group. | |
3871 | * | |
3872 | * Return 0 on success else a negative value either an errno code or a | |
3873 | * LTTng-UST error code. | |
3874 | */ | |
3875 | int ust_app_setup_trigger_group(struct ust_app *app) | |
3876 | { | |
3877 | int ret; | |
3878 | int writefd; | |
3879 | struct lttng_ust_object_data *group = NULL; | |
3880 | enum lttng_error_code lttng_ret; | |
3881 | enum trigger_error_accounting_status trigger_error_accounting_status; | |
3882 | ||
3883 | assert(app); | |
3884 | ||
3885 | /* Get the write side of the pipe */ | |
3886 | writefd = lttng_pipe_get_writefd(app->token_communication.trigger_event_pipe); | |
3887 | ||
3888 | pthread_mutex_lock(&app->sock_lock); | |
3889 | ret = ustctl_create_trigger_group(app->sock, writefd, &group); | |
3890 | pthread_mutex_unlock(&app->sock_lock); | |
3891 | if (ret < 0) { | |
3892 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
3893 | ERR("UST app %d create_trigger_group failed with ret %d, trigger pipe %d", app->sock, ret, writefd); | |
3894 | } else { | |
3895 | DBG("UST app %d create trigger group failed. Application is dead", app->sock); | |
3896 | } | |
3897 | goto end; | |
3898 | } | |
3899 | ||
3900 | lttng_ret = notification_thread_command_add_application( | |
3901 | notification_thread_handle, lttng_pipe_get_readfd(app->token_communication.trigger_event_pipe), LTTNG_DOMAIN_UST); | |
3902 | if (lttng_ret != LTTNG_OK) { | |
3903 | /* TODO: error */ | |
3904 | ret = - 1; | |
3905 | ERR("Failed to add channel to notification thread"); | |
3906 | goto end; | |
3907 | } | |
3908 | ||
3909 | /* Assign handle only when the complete setup is valid */ | |
3910 | app->token_communication.handle = group; | |
3911 | ||
3912 | trigger_error_accounting_status = trigger_error_accounting_register_app(app); | |
3913 | if (trigger_error_accounting_status != TRIGGER_ERROR_ACCOUNTING_STATUS_OK) { | |
3914 | ERR("Failed to setup trigger error accouting for app"); | |
3915 | ret = -1; | |
3916 | goto end; | |
3917 | } | |
3918 | ||
3919 | ||
3920 | end: | |
3921 | return ret; | |
3922 | } | |
3923 | ||
5b4a0ec0 DG |
3924 | /* |
3925 | * Unregister app by removing it from the global traceable app list and freeing | |
3926 | * the data struct. | |
3927 | * | |
3928 | * The socket is already closed at this point so no close to sock. | |
3929 | */ | |
3930 | void ust_app_unregister(int sock) | |
3931 | { | |
2463b787 | 3932 | enum lttng_error_code ret_code; |
5b4a0ec0 | 3933 | struct ust_app *lta; |
bec39940 | 3934 | struct lttng_ht_node_ulong *node; |
c4b88406 | 3935 | struct lttng_ht_iter ust_app_sock_iter; |
bec39940 | 3936 | struct lttng_ht_iter iter; |
d42f20df | 3937 | struct ust_app_session *ua_sess; |
525b0740 | 3938 | int ret; |
5b4a0ec0 DG |
3939 | |
3940 | rcu_read_lock(); | |
886459c6 | 3941 | |
5b4a0ec0 | 3942 | /* Get the node reference for a call_rcu */ |
c4b88406 MD |
3943 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &ust_app_sock_iter); |
3944 | node = lttng_ht_iter_get_node_ulong(&ust_app_sock_iter); | |
d0b96690 | 3945 | assert(node); |
284d8f55 | 3946 | |
852d0037 | 3947 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
3948 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
3949 | ||
d88aee68 | 3950 | /* |
ce34fcd0 MD |
3951 | * For per-PID buffers, perform "push metadata" and flush all |
3952 | * application streams before removing app from hash tables, | |
3953 | * ensuring proper behavior of data_pending check. | |
c4b88406 | 3954 | * Remove sessions so they are not visible during deletion. |
d88aee68 | 3955 | */ |
d42f20df DG |
3956 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, |
3957 | node.node) { | |
7972aab2 DG |
3958 | struct ust_registry_session *registry; |
3959 | ||
d42f20df DG |
3960 | ret = lttng_ht_del(lta->sessions, &iter); |
3961 | if (ret) { | |
3962 | /* The session was already removed so scheduled for teardown. */ | |
3963 | continue; | |
3964 | } | |
3965 | ||
ce34fcd0 MD |
3966 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { |
3967 | (void) ust_app_flush_app_session(lta, ua_sess); | |
3968 | } | |
c4b88406 | 3969 | |
d42f20df DG |
3970 | /* |
3971 | * Add session to list for teardown. This is safe since at this point we | |
3972 | * are the only one using this list. | |
3973 | */ | |
d88aee68 DG |
3974 | pthread_mutex_lock(&ua_sess->lock); |
3975 | ||
b161602a MD |
3976 | if (ua_sess->deleted) { |
3977 | pthread_mutex_unlock(&ua_sess->lock); | |
3978 | continue; | |
3979 | } | |
3980 | ||
d88aee68 DG |
3981 | /* |
3982 | * Normally, this is done in the delete session process which is | |
3983 | * executed in the call rcu below. However, upon registration we can't | |
3984 | * afford to wait for the grace period before pushing data or else the | |
3985 | * data pending feature can race between the unregistration and stop | |
3986 | * command where the data pending command is sent *before* the grace | |
3987 | * period ended. | |
3988 | * | |
3989 | * The close metadata below nullifies the metadata pointer in the | |
3990 | * session so the delete session will NOT push/close a second time. | |
3991 | */ | |
7972aab2 | 3992 | registry = get_session_registry(ua_sess); |
ce34fcd0 | 3993 | if (registry) { |
7972aab2 DG |
3994 | /* Push metadata for application before freeing the application. */ |
3995 | (void) push_metadata(registry, ua_sess->consumer); | |
3996 | ||
3997 | /* | |
3998 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
3999 | * metadata only on destroy trace session in this case. Also, the |
4000 | * previous push metadata could have flag the metadata registry to | |
4001 | * close so don't send a close command if closed. | |
7972aab2 | 4002 | */ |
ce34fcd0 | 4003 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
4004 | /* And ask to close it for this session registry. */ |
4005 | (void) close_metadata(registry, ua_sess->consumer); | |
4006 | } | |
4007 | } | |
d42f20df | 4008 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
c4b88406 | 4009 | |
d88aee68 | 4010 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
4011 | } |
4012 | ||
c4b88406 MD |
4013 | /* Remove application from PID hash table */ |
4014 | ret = lttng_ht_del(ust_app_ht_by_sock, &ust_app_sock_iter); | |
4015 | assert(!ret); | |
4016 | ||
4017 | /* | |
4018 | * Remove application from notify hash table. The thread handling the | |
4019 | * notify socket could have deleted the node so ignore on error because | |
c48239ca JG |
4020 | * either way it's valid. The close of that socket is handled by the |
4021 | * apps_notify_thread. | |
c4b88406 MD |
4022 | */ |
4023 | iter.iter.node = <a->notify_sock_n.node; | |
4024 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
4025 | ||
4026 | /* | |
4027 | * Ignore return value since the node might have been removed before by an | |
4028 | * add replace during app registration because the PID can be reassigned by | |
4029 | * the OS. | |
4030 | */ | |
4031 | iter.iter.node = <a->pid_n.node; | |
4032 | ret = lttng_ht_del(ust_app_ht, &iter); | |
4033 | if (ret) { | |
4034 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
4035 | lta->pid); | |
4036 | } | |
4037 | ||
2463b787 JR |
4038 | /* trigger handle can be null in certain scenario such as a dead app */ |
4039 | if (lta->token_communication.handle) { | |
4040 | int fd = lttng_pipe_get_readfd( | |
4041 | lta->token_communication.trigger_event_pipe); | |
4042 | ||
4043 | ret_code = notification_thread_command_remove_application( | |
4044 | notification_thread_handle, | |
4045 | fd); | |
4046 | if (ret_code != LTTNG_OK) { | |
4047 | ERR("Failed to remove application from notification thread"); | |
4048 | } | |
4049 | } | |
4050 | ||
852d0037 DG |
4051 | /* Free memory */ |
4052 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
4053 | ||
5b4a0ec0 DG |
4054 | rcu_read_unlock(); |
4055 | return; | |
284d8f55 DG |
4056 | } |
4057 | ||
5b4a0ec0 DG |
4058 | /* |
4059 | * Fill events array with all events name of all registered apps. | |
4060 | */ | |
4061 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 4062 | { |
5b4a0ec0 DG |
4063 | int ret, handle; |
4064 | size_t nbmem, count = 0; | |
bec39940 | 4065 | struct lttng_ht_iter iter; |
5b4a0ec0 | 4066 | struct ust_app *app; |
c617c0c6 | 4067 | struct lttng_event *tmp_event; |
421cb601 | 4068 | |
5b4a0ec0 | 4069 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
4070 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
4071 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
4072 | PERROR("zmalloc ust app events"); |
4073 | ret = -ENOMEM; | |
421cb601 DG |
4074 | goto error; |
4075 | } | |
4076 | ||
5b4a0ec0 | 4077 | rcu_read_lock(); |
421cb601 | 4078 | |
852d0037 | 4079 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 4080 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 4081 | |
840cb59c | 4082 | health_code_update(); |
86acf0da | 4083 | |
e0c7ec2b DG |
4084 | if (!app->compatible) { |
4085 | /* | |
4086 | * TODO: In time, we should notice the caller of this error by | |
4087 | * telling him that this is a version error. | |
4088 | */ | |
4089 | continue; | |
4090 | } | |
fb45065e | 4091 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4092 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 4093 | if (handle < 0) { |
ffe60014 DG |
4094 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
4095 | ERR("UST app list events getting handle failed for app pid %d", | |
4096 | app->pid); | |
4097 | } | |
fb45065e | 4098 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 DG |
4099 | continue; |
4100 | } | |
421cb601 | 4101 | |
852d0037 | 4102 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 4103 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
4104 | /* Handle ustctl error. */ |
4105 | if (ret < 0) { | |
fb45065e MD |
4106 | int release_ret; |
4107 | ||
a2ba1ab0 | 4108 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
4109 | ERR("UST app tp list get failed for app %d with ret %d", |
4110 | app->sock, ret); | |
4111 | } else { | |
4112 | DBG3("UST app tp list get failed. Application is dead"); | |
3757b385 DG |
4113 | /* |
4114 | * This is normal behavior, an application can die during the | |
4115 | * creation process. Don't report an error so the execution can | |
4116 | * continue normally. Continue normal execution. | |
4117 | */ | |
4118 | break; | |
ffe60014 | 4119 | } |
98f595d4 | 4120 | free(tmp_event); |
fb45065e | 4121 | release_ret = ustctl_release_handle(app->sock, handle); |
68313703 JG |
4122 | if (release_ret < 0 && |
4123 | release_ret != -LTTNG_UST_ERR_EXITING && | |
4124 | release_ret != -EPIPE) { | |
fb45065e MD |
4125 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
4126 | } | |
4127 | pthread_mutex_unlock(&app->sock_lock); | |
ffe60014 DG |
4128 | goto rcu_error; |
4129 | } | |
4130 | ||
840cb59c | 4131 | health_code_update(); |
815564d8 | 4132 | if (count >= nbmem) { |
d7b3776f | 4133 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
4134 | struct lttng_event *new_tmp_event; |
4135 | size_t new_nbmem; | |
4136 | ||
4137 | new_nbmem = nbmem << 1; | |
4138 | DBG2("Reallocating event list from %zu to %zu entries", | |
4139 | nbmem, new_nbmem); | |
4140 | new_tmp_event = realloc(tmp_event, | |
4141 | new_nbmem * sizeof(struct lttng_event)); | |
4142 | if (new_tmp_event == NULL) { | |
fb45065e MD |
4143 | int release_ret; |
4144 | ||
5b4a0ec0 | 4145 | PERROR("realloc ust app events"); |
c617c0c6 | 4146 | free(tmp_event); |
5b4a0ec0 | 4147 | ret = -ENOMEM; |
fb45065e | 4148 | release_ret = ustctl_release_handle(app->sock, handle); |
68313703 JG |
4149 | if (release_ret < 0 && |
4150 | release_ret != -LTTNG_UST_ERR_EXITING && | |
4151 | release_ret != -EPIPE) { | |
fb45065e MD |
4152 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
4153 | } | |
4154 | pthread_mutex_unlock(&app->sock_lock); | |
5b4a0ec0 DG |
4155 | goto rcu_error; |
4156 | } | |
53efb85a MD |
4157 | /* Zero the new memory */ |
4158 | memset(new_tmp_event + nbmem, 0, | |
4159 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
4160 | nbmem = new_nbmem; | |
4161 | tmp_event = new_tmp_event; | |
5b4a0ec0 | 4162 | } |
c617c0c6 MD |
4163 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
4164 | tmp_event[count].loglevel = uiter.loglevel; | |
4165 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
4166 | tmp_event[count].pid = app->pid; | |
4167 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 4168 | count++; |
421cb601 | 4169 | } |
fb45065e MD |
4170 | ret = ustctl_release_handle(app->sock, handle); |
4171 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 | 4172 | if (ret < 0 && ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
fb45065e MD |
4173 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
4174 | } | |
421cb601 DG |
4175 | } |
4176 | ||
5b4a0ec0 | 4177 | ret = count; |
c617c0c6 | 4178 | *events = tmp_event; |
421cb601 | 4179 | |
5b4a0ec0 | 4180 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 4181 | |
5b4a0ec0 DG |
4182 | rcu_error: |
4183 | rcu_read_unlock(); | |
421cb601 | 4184 | error: |
840cb59c | 4185 | health_code_update(); |
5b4a0ec0 | 4186 | return ret; |
421cb601 DG |
4187 | } |
4188 | ||
f37d259d MD |
4189 | /* |
4190 | * Fill events array with all events name of all registered apps. | |
4191 | */ | |
4192 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
4193 | { | |
4194 | int ret, handle; | |
4195 | size_t nbmem, count = 0; | |
4196 | struct lttng_ht_iter iter; | |
4197 | struct ust_app *app; | |
c617c0c6 | 4198 | struct lttng_event_field *tmp_event; |
f37d259d MD |
4199 | |
4200 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
4201 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
4202 | if (tmp_event == NULL) { | |
f37d259d MD |
4203 | PERROR("zmalloc ust app event fields"); |
4204 | ret = -ENOMEM; | |
4205 | goto error; | |
4206 | } | |
4207 | ||
4208 | rcu_read_lock(); | |
4209 | ||
4210 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4211 | struct lttng_ust_field_iter uiter; | |
4212 | ||
840cb59c | 4213 | health_code_update(); |
86acf0da | 4214 | |
f37d259d MD |
4215 | if (!app->compatible) { |
4216 | /* | |
4217 | * TODO: In time, we should notice the caller of this error by | |
4218 | * telling him that this is a version error. | |
4219 | */ | |
4220 | continue; | |
4221 | } | |
fb45065e | 4222 | pthread_mutex_lock(&app->sock_lock); |
f37d259d MD |
4223 | handle = ustctl_tracepoint_field_list(app->sock); |
4224 | if (handle < 0) { | |
ffe60014 DG |
4225 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
4226 | ERR("UST app list field getting handle failed for app pid %d", | |
4227 | app->pid); | |
4228 | } | |
fb45065e | 4229 | pthread_mutex_unlock(&app->sock_lock); |
f37d259d MD |
4230 | continue; |
4231 | } | |
4232 | ||
4233 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 4234 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
4235 | /* Handle ustctl error. */ |
4236 | if (ret < 0) { | |
fb45065e MD |
4237 | int release_ret; |
4238 | ||
a2ba1ab0 | 4239 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
4240 | ERR("UST app tp list field failed for app %d with ret %d", |
4241 | app->sock, ret); | |
4242 | } else { | |
4243 | DBG3("UST app tp list field failed. Application is dead"); | |
3757b385 DG |
4244 | /* |
4245 | * This is normal behavior, an application can die during the | |
4246 | * creation process. Don't report an error so the execution can | |
98f595d4 | 4247 | * continue normally. Reset list and count for next app. |
3757b385 DG |
4248 | */ |
4249 | break; | |
ffe60014 | 4250 | } |
98f595d4 | 4251 | free(tmp_event); |
fb45065e MD |
4252 | release_ret = ustctl_release_handle(app->sock, handle); |
4253 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
4254 | if (release_ret < 0 && |
4255 | release_ret != -LTTNG_UST_ERR_EXITING && | |
4256 | release_ret != -EPIPE) { | |
fb45065e MD |
4257 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
4258 | } | |
ffe60014 DG |
4259 | goto rcu_error; |
4260 | } | |
4261 | ||
840cb59c | 4262 | health_code_update(); |
f37d259d | 4263 | if (count >= nbmem) { |
d7b3776f | 4264 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
4265 | struct lttng_event_field *new_tmp_event; |
4266 | size_t new_nbmem; | |
4267 | ||
4268 | new_nbmem = nbmem << 1; | |
4269 | DBG2("Reallocating event field list from %zu to %zu entries", | |
4270 | nbmem, new_nbmem); | |
4271 | new_tmp_event = realloc(tmp_event, | |
4272 | new_nbmem * sizeof(struct lttng_event_field)); | |
4273 | if (new_tmp_event == NULL) { | |
fb45065e MD |
4274 | int release_ret; |
4275 | ||
f37d259d | 4276 | PERROR("realloc ust app event fields"); |
c617c0c6 | 4277 | free(tmp_event); |
f37d259d | 4278 | ret = -ENOMEM; |
fb45065e MD |
4279 | release_ret = ustctl_release_handle(app->sock, handle); |
4280 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
4281 | if (release_ret && |
4282 | release_ret != -LTTNG_UST_ERR_EXITING && | |
4283 | release_ret != -EPIPE) { | |
fb45065e MD |
4284 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
4285 | } | |
f37d259d MD |
4286 | goto rcu_error; |
4287 | } | |
53efb85a MD |
4288 | /* Zero the new memory */ |
4289 | memset(new_tmp_event + nbmem, 0, | |
4290 | (new_nbmem - nbmem) * sizeof(struct lttng_event_field)); | |
4291 | nbmem = new_nbmem; | |
4292 | tmp_event = new_tmp_event; | |
f37d259d | 4293 | } |
f37d259d | 4294 | |
c617c0c6 | 4295 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
2e84128e DG |
4296 | /* Mapping between these enums matches 1 to 1. */ |
4297 | tmp_event[count].type = (enum lttng_event_field_type) uiter.type; | |
c617c0c6 | 4298 | tmp_event[count].nowrite = uiter.nowrite; |
f37d259d | 4299 | |
c617c0c6 MD |
4300 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
4301 | tmp_event[count].event.loglevel = uiter.loglevel; | |
2e84128e | 4302 | tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; |
c617c0c6 MD |
4303 | tmp_event[count].event.pid = app->pid; |
4304 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
4305 | count++; |
4306 | } | |
fb45065e MD |
4307 | ret = ustctl_release_handle(app->sock, handle); |
4308 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
4309 | if (ret < 0 && |
4310 | ret != -LTTNG_UST_ERR_EXITING && | |
4311 | ret != -EPIPE) { | |
fb45065e MD |
4312 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
4313 | } | |
f37d259d MD |
4314 | } |
4315 | ||
4316 | ret = count; | |
c617c0c6 | 4317 | *fields = tmp_event; |
f37d259d MD |
4318 | |
4319 | DBG2("UST app list event fields done (%zu events)", count); | |
4320 | ||
4321 | rcu_error: | |
4322 | rcu_read_unlock(); | |
4323 | error: | |
840cb59c | 4324 | health_code_update(); |
f37d259d MD |
4325 | return ret; |
4326 | } | |
4327 | ||
5b4a0ec0 DG |
4328 | /* |
4329 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
4330 | * |
4331 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
4332 | */ |
4333 | void ust_app_clean_list(void) | |
421cb601 | 4334 | { |
5b4a0ec0 | 4335 | int ret; |
659ed79f | 4336 | struct ust_app *app; |
bec39940 | 4337 | struct lttng_ht_iter iter; |
421cb601 | 4338 | |
5b4a0ec0 | 4339 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 4340 | |
5b4a0ec0 | 4341 | rcu_read_lock(); |
421cb601 | 4342 | |
faadaa3a JG |
4343 | /* Cleanup notify socket hash table */ |
4344 | if (ust_app_ht_by_notify_sock) { | |
4345 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
4346 | notify_sock_n.node) { | |
4347 | struct cds_lfht_node *node; | |
4348 | struct ust_app *app; | |
4349 | ||
4350 | node = cds_lfht_iter_get_node(&iter.iter); | |
4351 | if (!node) { | |
4352 | continue; | |
4353 | } | |
4354 | ||
4355 | app = container_of(node, struct ust_app, | |
4356 | notify_sock_n.node); | |
4357 | ust_app_notify_sock_unregister(app->notify_sock); | |
4358 | } | |
4359 | } | |
4360 | ||
f1b711c4 MD |
4361 | if (ust_app_ht) { |
4362 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4363 | ret = lttng_ht_del(ust_app_ht, &iter); | |
4364 | assert(!ret); | |
4365 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
4366 | } | |
421cb601 DG |
4367 | } |
4368 | ||
852d0037 | 4369 | /* Cleanup socket hash table */ |
f1b711c4 MD |
4370 | if (ust_app_ht_by_sock) { |
4371 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, | |
4372 | sock_n.node) { | |
4373 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); | |
4374 | assert(!ret); | |
4375 | } | |
bec39940 | 4376 | } |
852d0037 | 4377 | |
36b588ed | 4378 | rcu_read_unlock(); |
d88aee68 | 4379 | |
bec39940 | 4380 | /* Destroy is done only when the ht is empty */ |
f1b711c4 MD |
4381 | if (ust_app_ht) { |
4382 | ht_cleanup_push(ust_app_ht); | |
4383 | } | |
4384 | if (ust_app_ht_by_sock) { | |
4385 | ht_cleanup_push(ust_app_ht_by_sock); | |
4386 | } | |
4387 | if (ust_app_ht_by_notify_sock) { | |
4388 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
4389 | } | |
5b4a0ec0 DG |
4390 | } |
4391 | ||
4392 | /* | |
4393 | * Init UST app hash table. | |
4394 | */ | |
57703f6e | 4395 | int ust_app_ht_alloc(void) |
5b4a0ec0 | 4396 | { |
bec39940 | 4397 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
4398 | if (!ust_app_ht) { |
4399 | return -1; | |
4400 | } | |
852d0037 | 4401 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
4402 | if (!ust_app_ht_by_sock) { |
4403 | return -1; | |
4404 | } | |
d0b96690 | 4405 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
4406 | if (!ust_app_ht_by_notify_sock) { |
4407 | return -1; | |
4408 | } | |
4409 | return 0; | |
421cb601 DG |
4410 | } |
4411 | ||
78f0bacd DG |
4412 | /* |
4413 | * For a specific UST session, disable the channel for all registered apps. | |
4414 | */ | |
35a9059d | 4415 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
4416 | struct ltt_ust_channel *uchan) |
4417 | { | |
4418 | int ret = 0; | |
bec39940 DG |
4419 | struct lttng_ht_iter iter; |
4420 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
4421 | struct ust_app *app; |
4422 | struct ust_app_session *ua_sess; | |
8535a6d9 | 4423 | struct ust_app_channel *ua_chan; |
78f0bacd | 4424 | |
88e3c2f5 | 4425 | assert(usess->active); |
d9bf3ca4 | 4426 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 4427 | uchan->name, usess->id); |
78f0bacd DG |
4428 | |
4429 | rcu_read_lock(); | |
4430 | ||
4431 | /* For every registered applications */ | |
852d0037 | 4432 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 4433 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
4434 | if (!app->compatible) { |
4435 | /* | |
4436 | * TODO: In time, we should notice the caller of this error by | |
4437 | * telling him that this is a version error. | |
4438 | */ | |
4439 | continue; | |
4440 | } | |
78f0bacd DG |
4441 | ua_sess = lookup_session_by_app(usess, app); |
4442 | if (ua_sess == NULL) { | |
4443 | continue; | |
4444 | } | |
4445 | ||
8535a6d9 | 4446 | /* Get channel */ |
bec39940 DG |
4447 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4448 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
4449 | /* If the session if found for the app, the channel must be there */ |
4450 | assert(ua_chan_node); | |
4451 | ||
4452 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4453 | /* The channel must not be already disabled */ | |
4454 | assert(ua_chan->enabled == 1); | |
4455 | ||
4456 | /* Disable channel onto application */ | |
4457 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
4458 | if (ret < 0) { |
4459 | /* XXX: We might want to report this error at some point... */ | |
4460 | continue; | |
4461 | } | |
4462 | } | |
4463 | ||
4464 | rcu_read_unlock(); | |
78f0bacd DG |
4465 | return ret; |
4466 | } | |
4467 | ||
4468 | /* | |
4469 | * For a specific UST session, enable the channel for all registered apps. | |
4470 | */ | |
35a9059d | 4471 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
4472 | struct ltt_ust_channel *uchan) |
4473 | { | |
4474 | int ret = 0; | |
bec39940 | 4475 | struct lttng_ht_iter iter; |
78f0bacd DG |
4476 | struct ust_app *app; |
4477 | struct ust_app_session *ua_sess; | |
4478 | ||
88e3c2f5 | 4479 | assert(usess->active); |
d9bf3ca4 | 4480 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 4481 | uchan->name, usess->id); |
78f0bacd DG |
4482 | |
4483 | rcu_read_lock(); | |
4484 | ||
4485 | /* For every registered applications */ | |
852d0037 | 4486 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4487 | if (!app->compatible) { |
4488 | /* | |
4489 | * TODO: In time, we should notice the caller of this error by | |
4490 | * telling him that this is a version error. | |
4491 | */ | |
4492 | continue; | |
4493 | } | |
78f0bacd DG |
4494 | ua_sess = lookup_session_by_app(usess, app); |
4495 | if (ua_sess == NULL) { | |
4496 | continue; | |
4497 | } | |
4498 | ||
4499 | /* Enable channel onto application */ | |
4500 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
4501 | if (ret < 0) { | |
4502 | /* XXX: We might want to report this error at some point... */ | |
4503 | continue; | |
4504 | } | |
4505 | } | |
4506 | ||
4507 | rcu_read_unlock(); | |
78f0bacd DG |
4508 | return ret; |
4509 | } | |
4510 | ||
b0a40d28 DG |
4511 | /* |
4512 | * Disable an event in a channel and for a specific session. | |
4513 | */ | |
35a9059d DG |
4514 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
4515 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
4516 | { |
4517 | int ret = 0; | |
bec39940 | 4518 | struct lttng_ht_iter iter, uiter; |
700c5a9d | 4519 | struct lttng_ht_node_str *ua_chan_node; |
b0a40d28 DG |
4520 | struct ust_app *app; |
4521 | struct ust_app_session *ua_sess; | |
4522 | struct ust_app_channel *ua_chan; | |
4523 | struct ust_app_event *ua_event; | |
4524 | ||
88e3c2f5 | 4525 | assert(usess->active); |
b0a40d28 | 4526 | DBG("UST app disabling event %s for all apps in channel " |
d9bf3ca4 MD |
4527 | "%s for session id %" PRIu64, |
4528 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
4529 | |
4530 | rcu_read_lock(); | |
4531 | ||
4532 | /* For all registered applications */ | |
852d0037 | 4533 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4534 | if (!app->compatible) { |
4535 | /* | |
4536 | * TODO: In time, we should notice the caller of this error by | |
4537 | * telling him that this is a version error. | |
4538 | */ | |
4539 | continue; | |
4540 | } | |
b0a40d28 DG |
4541 | ua_sess = lookup_session_by_app(usess, app); |
4542 | if (ua_sess == NULL) { | |
4543 | /* Next app */ | |
4544 | continue; | |
4545 | } | |
4546 | ||
4547 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
4548 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4549 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 4550 | if (ua_chan_node == NULL) { |
d9bf3ca4 | 4551 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 4552 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
4553 | continue; |
4554 | } | |
4555 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4556 | ||
700c5a9d JR |
4557 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
4558 | uevent->filter, uevent->attr.loglevel, | |
4559 | uevent->exclusion); | |
4560 | if (ua_event == NULL) { | |
b0a40d28 | 4561 | DBG2("Event %s not found in channel %s for app pid %d." |
852d0037 | 4562 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
4563 | continue; |
4564 | } | |
b0a40d28 | 4565 | |
7f79d3a1 | 4566 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
4567 | if (ret < 0) { |
4568 | /* XXX: Report error someday... */ | |
4569 | continue; | |
4570 | } | |
4571 | } | |
4572 | ||
4573 | rcu_read_unlock(); | |
88e3c2f5 JG |
4574 | return ret; |
4575 | } | |
4576 | ||
4577 | /* The ua_sess lock must be held by the caller. */ | |
4578 | static | |
4579 | int ust_app_channel_create(struct ltt_ust_session *usess, | |
4580 | struct ust_app_session *ua_sess, | |
4581 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
4582 | struct ust_app_channel **_ua_chan) | |
4583 | { | |
4584 | int ret = 0; | |
4585 | struct ust_app_channel *ua_chan = NULL; | |
4586 | ||
4587 | assert(ua_sess); | |
4588 | ASSERT_LOCKED(ua_sess->lock); | |
4589 | ||
4590 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, | |
4591 | sizeof(uchan->name))) { | |
4592 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, | |
4593 | &uchan->attr); | |
4594 | ret = 0; | |
4595 | } else { | |
4596 | struct ltt_ust_context *uctx = NULL; | |
4597 | ||
4598 | /* | |
4599 | * Create channel onto application and synchronize its | |
4600 | * configuration. | |
4601 | */ | |
4602 | ret = ust_app_channel_allocate(ua_sess, uchan, | |
4603 | LTTNG_UST_CHAN_PER_CPU, usess, | |
4604 | &ua_chan); | |
88ebf5a7 JR |
4605 | if (ret < 0) { |
4606 | goto error; | |
4607 | } | |
4608 | ||
4609 | ret = ust_app_channel_send(app, usess, | |
4610 | ua_sess, ua_chan); | |
4611 | if (ret) { | |
4612 | goto error; | |
88e3c2f5 JG |
4613 | } |
4614 | ||
4615 | /* Add contexts. */ | |
4616 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { | |
4617 | ret = create_ust_app_channel_context(ua_chan, | |
4618 | &uctx->ctx, app); | |
4619 | if (ret) { | |
88ebf5a7 | 4620 | goto error; |
88e3c2f5 JG |
4621 | } |
4622 | } | |
4623 | } | |
88ebf5a7 JR |
4624 | |
4625 | error: | |
88e3c2f5 JG |
4626 | if (ret < 0) { |
4627 | switch (ret) { | |
4628 | case -ENOTCONN: | |
4629 | /* | |
4630 | * The application's socket is not valid. Either a bad socket | |
4631 | * or a timeout on it. We can't inform the caller that for a | |
4632 | * specific app, the session failed so lets continue here. | |
4633 | */ | |
4634 | ret = 0; /* Not an error. */ | |
4635 | break; | |
4636 | case -ENOMEM: | |
4637 | default: | |
4638 | break; | |
4639 | } | |
4640 | } | |
88ebf5a7 | 4641 | |
88e3c2f5 JG |
4642 | if (ret == 0 && _ua_chan) { |
4643 | /* | |
4644 | * Only return the application's channel on success. Note | |
4645 | * that the channel can still be part of the application's | |
4646 | * channel hashtable on error. | |
4647 | */ | |
4648 | *_ua_chan = ua_chan; | |
4649 | } | |
b0a40d28 DG |
4650 | return ret; |
4651 | } | |
4652 | ||
5b4a0ec0 | 4653 | /* |
edb67388 | 4654 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 4655 | */ |
35a9059d | 4656 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
4657 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4658 | { | |
4659 | int ret = 0; | |
bec39940 | 4660 | struct lttng_ht_iter iter, uiter; |
18eace3b | 4661 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
4662 | struct ust_app *app; |
4663 | struct ust_app_session *ua_sess; | |
4664 | struct ust_app_channel *ua_chan; | |
4665 | struct ust_app_event *ua_event; | |
48842b30 | 4666 | |
88e3c2f5 | 4667 | assert(usess->active); |
d9bf3ca4 | 4668 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 4669 | uevent->attr.name, usess->id); |
48842b30 | 4670 | |
edb67388 DG |
4671 | /* |
4672 | * NOTE: At this point, this function is called only if the session and | |
4673 | * channel passed are already created for all apps. and enabled on the | |
4674 | * tracer also. | |
4675 | */ | |
4676 | ||
48842b30 | 4677 | rcu_read_lock(); |
421cb601 DG |
4678 | |
4679 | /* For all registered applications */ | |
852d0037 | 4680 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4681 | if (!app->compatible) { |
4682 | /* | |
4683 | * TODO: In time, we should notice the caller of this error by | |
4684 | * telling him that this is a version error. | |
4685 | */ | |
4686 | continue; | |
4687 | } | |
edb67388 | 4688 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4689 | if (!ua_sess) { |
4690 | /* The application has problem or is probably dead. */ | |
4691 | continue; | |
4692 | } | |
ba767faf | 4693 | |
d0b96690 DG |
4694 | pthread_mutex_lock(&ua_sess->lock); |
4695 | ||
b161602a MD |
4696 | if (ua_sess->deleted) { |
4697 | pthread_mutex_unlock(&ua_sess->lock); | |
4698 | continue; | |
4699 | } | |
4700 | ||
edb67388 | 4701 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4702 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4703 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
a7169585 MD |
4704 | /* |
4705 | * It is possible that the channel cannot be found is | |
4706 | * the channel/event creation occurs concurrently with | |
4707 | * an application exit. | |
4708 | */ | |
4709 | if (!ua_chan_node) { | |
4710 | pthread_mutex_unlock(&ua_sess->lock); | |
4711 | continue; | |
4712 | } | |
edb67388 DG |
4713 | |
4714 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4715 | ||
18eace3b DG |
4716 | /* Get event node */ |
4717 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
39c5a3a7 | 4718 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 4719 | if (ua_event == NULL) { |
7f79d3a1 | 4720 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 4721 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 4722 | goto next_app; |
35a9059d | 4723 | } |
35a9059d DG |
4724 | |
4725 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
4726 | if (ret < 0) { | |
d0b96690 | 4727 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 4728 | goto error; |
48842b30 | 4729 | } |
d0b96690 DG |
4730 | next_app: |
4731 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
4732 | } |
4733 | ||
7f79d3a1 | 4734 | error: |
edb67388 | 4735 | rcu_read_unlock(); |
edb67388 DG |
4736 | return ret; |
4737 | } | |
4738 | ||
4739 | /* | |
4740 | * For a specific existing UST session and UST channel, creates the event for | |
4741 | * all registered apps. | |
4742 | */ | |
35a9059d | 4743 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
4744 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4745 | { | |
4746 | int ret = 0; | |
bec39940 DG |
4747 | struct lttng_ht_iter iter, uiter; |
4748 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
4749 | struct ust_app *app; |
4750 | struct ust_app_session *ua_sess; | |
4751 | struct ust_app_channel *ua_chan; | |
4752 | ||
88e3c2f5 | 4753 | assert(usess->active); |
d9bf3ca4 | 4754 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 4755 | uevent->attr.name, usess->id); |
edb67388 | 4756 | |
edb67388 DG |
4757 | rcu_read_lock(); |
4758 | ||
4759 | /* For all registered applications */ | |
852d0037 | 4760 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4761 | if (!app->compatible) { |
4762 | /* | |
4763 | * TODO: In time, we should notice the caller of this error by | |
4764 | * telling him that this is a version error. | |
4765 | */ | |
4766 | continue; | |
4767 | } | |
edb67388 | 4768 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4769 | if (!ua_sess) { |
4770 | /* The application has problem or is probably dead. */ | |
4771 | continue; | |
4772 | } | |
48842b30 | 4773 | |
d0b96690 | 4774 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
4775 | |
4776 | if (ua_sess->deleted) { | |
4777 | pthread_mutex_unlock(&ua_sess->lock); | |
4778 | continue; | |
4779 | } | |
4780 | ||
48842b30 | 4781 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4782 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4783 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
4784 | /* If the channel is not found, there is a code flow error */ |
4785 | assert(ua_chan_node); | |
4786 | ||
48842b30 DG |
4787 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
4788 | ||
edb67388 | 4789 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 4790 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 4791 | if (ret < 0) { |
49c336c1 | 4792 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
4793 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
4794 | break; | |
4795 | } | |
4796 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 4797 | uevent->attr.name, app->pid); |
5b4a0ec0 | 4798 | continue; |
48842b30 | 4799 | } |
48842b30 | 4800 | } |
5b4a0ec0 | 4801 | |
48842b30 | 4802 | rcu_read_unlock(); |
48842b30 DG |
4803 | return ret; |
4804 | } | |
4805 | ||
5b4a0ec0 DG |
4806 | /* |
4807 | * Start tracing for a specific UST session and app. | |
fad1ed2f JR |
4808 | * |
4809 | * Called with UST app session lock held. | |
4810 | * | |
5b4a0ec0 | 4811 | */ |
b34cbebf | 4812 | static |
421cb601 | 4813 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
4814 | { |
4815 | int ret = 0; | |
48842b30 | 4816 | struct ust_app_session *ua_sess; |
48842b30 | 4817 | |
852d0037 | 4818 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 4819 | |
509cbaf8 MD |
4820 | rcu_read_lock(); |
4821 | ||
e0c7ec2b DG |
4822 | if (!app->compatible) { |
4823 | goto end; | |
4824 | } | |
4825 | ||
421cb601 DG |
4826 | ua_sess = lookup_session_by_app(usess, app); |
4827 | if (ua_sess == NULL) { | |
d42f20df DG |
4828 | /* The session is in teardown process. Ignore and continue. */ |
4829 | goto end; | |
421cb601 | 4830 | } |
48842b30 | 4831 | |
d0b96690 DG |
4832 | pthread_mutex_lock(&ua_sess->lock); |
4833 | ||
b161602a MD |
4834 | if (ua_sess->deleted) { |
4835 | pthread_mutex_unlock(&ua_sess->lock); | |
4836 | goto end; | |
4837 | } | |
4838 | ||
b0a1c741 JR |
4839 | if (ua_sess->enabled) { |
4840 | pthread_mutex_unlock(&ua_sess->lock); | |
4841 | goto end; | |
4842 | } | |
4843 | ||
aea829b3 DG |
4844 | /* Upon restart, we skip the setup, already done */ |
4845 | if (ua_sess->started) { | |
8be98f9a | 4846 | goto skip_setup; |
aea829b3 | 4847 | } |
8be98f9a | 4848 | |
d65d2de8 DG |
4849 | /* |
4850 | * Create the metadata for the application. This returns gracefully if a | |
4851 | * metadata was already set for the session. | |
4852 | */ | |
ad7a9107 | 4853 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer); |
421cb601 | 4854 | if (ret < 0) { |
d0b96690 | 4855 | goto error_unlock; |
421cb601 | 4856 | } |
48842b30 | 4857 | |
840cb59c | 4858 | health_code_update(); |
86acf0da | 4859 | |
8be98f9a | 4860 | skip_setup: |
a945cdc7 | 4861 | /* This starts the UST tracing */ |
fb45065e | 4862 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4863 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
fb45065e | 4864 | pthread_mutex_unlock(&app->sock_lock); |
421cb601 | 4865 | if (ret < 0) { |
ffe60014 DG |
4866 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4867 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
4868 | app->pid, ret); | |
4869 | } else { | |
4870 | DBG("UST app start session failed. Application is dead."); | |
3757b385 DG |
4871 | /* |
4872 | * This is normal behavior, an application can die during the | |
4873 | * creation process. Don't report an error so the execution can | |
4874 | * continue normally. | |
4875 | */ | |
4876 | pthread_mutex_unlock(&ua_sess->lock); | |
4877 | goto end; | |
ffe60014 | 4878 | } |
d0b96690 | 4879 | goto error_unlock; |
421cb601 | 4880 | } |
5b4a0ec0 | 4881 | |
55c3953d DG |
4882 | /* Indicate that the session has been started once */ |
4883 | ua_sess->started = 1; | |
b0a1c741 | 4884 | ua_sess->enabled = 1; |
55c3953d | 4885 | |
d0b96690 DG |
4886 | pthread_mutex_unlock(&ua_sess->lock); |
4887 | ||
840cb59c | 4888 | health_code_update(); |
86acf0da | 4889 | |
421cb601 | 4890 | /* Quiescent wait after starting trace */ |
fb45065e | 4891 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4892 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4893 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4894 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4895 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4896 | app->pid, ret); | |
4897 | } | |
48842b30 | 4898 | |
e0c7ec2b DG |
4899 | end: |
4900 | rcu_read_unlock(); | |
840cb59c | 4901 | health_code_update(); |
421cb601 | 4902 | return 0; |
48842b30 | 4903 | |
d0b96690 DG |
4904 | error_unlock: |
4905 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 4906 | rcu_read_unlock(); |
840cb59c | 4907 | health_code_update(); |
421cb601 DG |
4908 | return -1; |
4909 | } | |
48842b30 | 4910 | |
8be98f9a MD |
4911 | /* |
4912 | * Stop tracing for a specific UST session and app. | |
4913 | */ | |
b34cbebf | 4914 | static |
8be98f9a MD |
4915 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
4916 | { | |
4917 | int ret = 0; | |
4918 | struct ust_app_session *ua_sess; | |
7972aab2 | 4919 | struct ust_registry_session *registry; |
8be98f9a | 4920 | |
852d0037 | 4921 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
4922 | |
4923 | rcu_read_lock(); | |
4924 | ||
e0c7ec2b | 4925 | if (!app->compatible) { |
d88aee68 | 4926 | goto end_no_session; |
e0c7ec2b DG |
4927 | } |
4928 | ||
8be98f9a MD |
4929 | ua_sess = lookup_session_by_app(usess, app); |
4930 | if (ua_sess == NULL) { | |
d88aee68 | 4931 | goto end_no_session; |
8be98f9a MD |
4932 | } |
4933 | ||
d88aee68 DG |
4934 | pthread_mutex_lock(&ua_sess->lock); |
4935 | ||
b161602a MD |
4936 | if (ua_sess->deleted) { |
4937 | pthread_mutex_unlock(&ua_sess->lock); | |
4938 | goto end_no_session; | |
4939 | } | |
4940 | ||
9bc07046 DG |
4941 | /* |
4942 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
4943 | * that was never started. It's possible since we can have a fail start |
4944 | * from either the application manager thread or the command thread. Simply | |
4945 | * indicate that this is a stop error. | |
9bc07046 | 4946 | */ |
f9dfc3d9 | 4947 | if (!ua_sess->started) { |
c45536e1 DG |
4948 | goto error_rcu_unlock; |
4949 | } | |
7db205b5 | 4950 | |
840cb59c | 4951 | health_code_update(); |
86acf0da | 4952 | |
9d6c7d3f | 4953 | /* This inhibits UST tracing */ |
fb45065e | 4954 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4955 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
fb45065e | 4956 | pthread_mutex_unlock(&app->sock_lock); |
9d6c7d3f | 4957 | if (ret < 0) { |
ffe60014 DG |
4958 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4959 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
4960 | app->pid, ret); | |
4961 | } else { | |
4962 | DBG("UST app stop session failed. Application is dead."); | |
3757b385 DG |
4963 | /* |
4964 | * This is normal behavior, an application can die during the | |
4965 | * creation process. Don't report an error so the execution can | |
4966 | * continue normally. | |
4967 | */ | |
4968 | goto end_unlock; | |
ffe60014 | 4969 | } |
9d6c7d3f DG |
4970 | goto error_rcu_unlock; |
4971 | } | |
4972 | ||
840cb59c | 4973 | health_code_update(); |
b0a1c741 | 4974 | ua_sess->enabled = 0; |
86acf0da | 4975 | |
9d6c7d3f | 4976 | /* Quiescent wait after stopping trace */ |
fb45065e | 4977 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4978 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4979 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4980 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4981 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4982 | app->pid, ret); | |
4983 | } | |
9d6c7d3f | 4984 | |
840cb59c | 4985 | health_code_update(); |
86acf0da | 4986 | |
b34cbebf | 4987 | registry = get_session_registry(ua_sess); |
fad1ed2f JR |
4988 | |
4989 | /* The UST app session is held registry shall not be null. */ | |
b34cbebf | 4990 | assert(registry); |
1b532a60 | 4991 | |
ce34fcd0 MD |
4992 | /* Push metadata for application before freeing the application. */ |
4993 | (void) push_metadata(registry, ua_sess->consumer); | |
b34cbebf | 4994 | |
3757b385 | 4995 | end_unlock: |
b34cbebf MD |
4996 | pthread_mutex_unlock(&ua_sess->lock); |
4997 | end_no_session: | |
4998 | rcu_read_unlock(); | |
4999 | health_code_update(); | |
5000 | return 0; | |
5001 | ||
5002 | error_rcu_unlock: | |
5003 | pthread_mutex_unlock(&ua_sess->lock); | |
5004 | rcu_read_unlock(); | |
5005 | health_code_update(); | |
5006 | return -1; | |
5007 | } | |
5008 | ||
b34cbebf | 5009 | static |
c4b88406 MD |
5010 | int ust_app_flush_app_session(struct ust_app *app, |
5011 | struct ust_app_session *ua_sess) | |
b34cbebf | 5012 | { |
c4b88406 | 5013 | int ret, retval = 0; |
b34cbebf | 5014 | struct lttng_ht_iter iter; |
b34cbebf | 5015 | struct ust_app_channel *ua_chan; |
c4b88406 | 5016 | struct consumer_socket *socket; |
b34cbebf | 5017 | |
c4b88406 | 5018 | DBG("Flushing app session buffers for ust app pid %d", app->pid); |
b34cbebf MD |
5019 | |
5020 | rcu_read_lock(); | |
5021 | ||
5022 | if (!app->compatible) { | |
c4b88406 | 5023 | goto end_not_compatible; |
b34cbebf MD |
5024 | } |
5025 | ||
5026 | pthread_mutex_lock(&ua_sess->lock); | |
5027 | ||
b161602a MD |
5028 | if (ua_sess->deleted) { |
5029 | goto end_deleted; | |
5030 | } | |
5031 | ||
b34cbebf MD |
5032 | health_code_update(); |
5033 | ||
9d6c7d3f | 5034 | /* Flushing buffers */ |
c4b88406 MD |
5035 | socket = consumer_find_socket_by_bitness(app->bits_per_long, |
5036 | ua_sess->consumer); | |
ce34fcd0 MD |
5037 | |
5038 | /* Flush buffers and push metadata. */ | |
5039 | switch (ua_sess->buffer_type) { | |
5040 | case LTTNG_BUFFER_PER_PID: | |
5041 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, | |
5042 | node.node) { | |
5043 | health_code_update(); | |
ce34fcd0 MD |
5044 | ret = consumer_flush_channel(socket, ua_chan->key); |
5045 | if (ret) { | |
5046 | ERR("Error flushing consumer channel"); | |
5047 | retval = -1; | |
5048 | continue; | |
5049 | } | |
8be98f9a | 5050 | } |
ce34fcd0 MD |
5051 | break; |
5052 | case LTTNG_BUFFER_PER_UID: | |
5053 | default: | |
5054 | assert(0); | |
5055 | break; | |
8be98f9a | 5056 | } |
8be98f9a | 5057 | |
840cb59c | 5058 | health_code_update(); |
86acf0da | 5059 | |
b161602a | 5060 | end_deleted: |
d88aee68 | 5061 | pthread_mutex_unlock(&ua_sess->lock); |
ce34fcd0 | 5062 | |
c4b88406 MD |
5063 | end_not_compatible: |
5064 | rcu_read_unlock(); | |
5065 | health_code_update(); | |
5066 | return retval; | |
5067 | } | |
5068 | ||
5069 | /* | |
ce34fcd0 MD |
5070 | * Flush buffers for all applications for a specific UST session. |
5071 | * Called with UST session lock held. | |
c4b88406 MD |
5072 | */ |
5073 | static | |
ce34fcd0 | 5074 | int ust_app_flush_session(struct ltt_ust_session *usess) |
c4b88406 MD |
5075 | |
5076 | { | |
99b1411c | 5077 | int ret = 0; |
c4b88406 | 5078 | |
ce34fcd0 | 5079 | DBG("Flushing session buffers for all ust apps"); |
c4b88406 MD |
5080 | |
5081 | rcu_read_lock(); | |
5082 | ||
ce34fcd0 MD |
5083 | /* Flush buffers and push metadata. */ |
5084 | switch (usess->buffer_type) { | |
5085 | case LTTNG_BUFFER_PER_UID: | |
5086 | { | |
5087 | struct buffer_reg_uid *reg; | |
5088 | struct lttng_ht_iter iter; | |
5089 | ||
5090 | /* Flush all per UID buffers associated to that session. */ | |
5091 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
5092 | struct ust_registry_session *ust_session_reg; | |
5093 | struct buffer_reg_channel *reg_chan; | |
5094 | struct consumer_socket *socket; | |
5095 | ||
5096 | /* Get consumer socket to use to push the metadata.*/ | |
5097 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
5098 | usess->consumer); | |
5099 | if (!socket) { | |
5100 | /* Ignore request if no consumer is found for the session. */ | |
5101 | continue; | |
5102 | } | |
5103 | ||
5104 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
5105 | reg_chan, node.node) { | |
5106 | /* | |
5107 | * The following call will print error values so the return | |
5108 | * code is of little importance because whatever happens, we | |
5109 | * have to try them all. | |
5110 | */ | |
5111 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
5112 | } | |
5113 | ||
5114 | ust_session_reg = reg->registry->reg.ust; | |
5115 | /* Push metadata. */ | |
5116 | (void) push_metadata(ust_session_reg, usess->consumer); | |
5117 | } | |
ce34fcd0 MD |
5118 | break; |
5119 | } | |
5120 | case LTTNG_BUFFER_PER_PID: | |
5121 | { | |
5122 | struct ust_app_session *ua_sess; | |
5123 | struct lttng_ht_iter iter; | |
5124 | struct ust_app *app; | |
5125 | ||
5126 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5127 | ua_sess = lookup_session_by_app(usess, app); | |
5128 | if (ua_sess == NULL) { | |
5129 | continue; | |
5130 | } | |
5131 | (void) ust_app_flush_app_session(app, ua_sess); | |
5132 | } | |
5133 | break; | |
5134 | } | |
5135 | default: | |
99b1411c | 5136 | ret = -1; |
ce34fcd0 MD |
5137 | assert(0); |
5138 | break; | |
c4b88406 | 5139 | } |
c4b88406 | 5140 | |
7db205b5 | 5141 | rcu_read_unlock(); |
840cb59c | 5142 | health_code_update(); |
c4b88406 | 5143 | return ret; |
8be98f9a MD |
5144 | } |
5145 | ||
0dd01979 MD |
5146 | static |
5147 | int ust_app_clear_quiescent_app_session(struct ust_app *app, | |
5148 | struct ust_app_session *ua_sess) | |
5149 | { | |
5150 | int ret = 0; | |
5151 | struct lttng_ht_iter iter; | |
5152 | struct ust_app_channel *ua_chan; | |
5153 | struct consumer_socket *socket; | |
5154 | ||
5155 | DBG("Clearing stream quiescent state for ust app pid %d", app->pid); | |
5156 | ||
5157 | rcu_read_lock(); | |
5158 | ||
5159 | if (!app->compatible) { | |
5160 | goto end_not_compatible; | |
5161 | } | |
5162 | ||
5163 | pthread_mutex_lock(&ua_sess->lock); | |
5164 | ||
5165 | if (ua_sess->deleted) { | |
5166 | goto end_unlock; | |
5167 | } | |
5168 | ||
5169 | health_code_update(); | |
5170 | ||
5171 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
5172 | ua_sess->consumer); | |
5173 | if (!socket) { | |
5174 | ERR("Failed to find consumer (%" PRIu32 ") socket", | |
5175 | app->bits_per_long); | |
5176 | ret = -1; | |
5177 | goto end_unlock; | |
5178 | } | |
5179 | ||
5180 | /* Clear quiescent state. */ | |
5181 | switch (ua_sess->buffer_type) { | |
5182 | case LTTNG_BUFFER_PER_PID: | |
5183 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, | |
5184 | ua_chan, node.node) { | |
5185 | health_code_update(); | |
5186 | ret = consumer_clear_quiescent_channel(socket, | |
5187 | ua_chan->key); | |
5188 | if (ret) { | |
5189 | ERR("Error clearing quiescent state for consumer channel"); | |
5190 | ret = -1; | |
5191 | continue; | |
5192 | } | |
5193 | } | |
5194 | break; | |
5195 | case LTTNG_BUFFER_PER_UID: | |
5196 | default: | |
5197 | assert(0); | |
5198 | ret = -1; | |
5199 | break; | |
5200 | } | |
5201 | ||
5202 | health_code_update(); | |
5203 | ||
5204 | end_unlock: | |
5205 | pthread_mutex_unlock(&ua_sess->lock); | |
5206 | ||
5207 | end_not_compatible: | |
5208 | rcu_read_unlock(); | |
5209 | health_code_update(); | |
5210 | return ret; | |
5211 | } | |
5212 | ||
5213 | /* | |
5214 | * Clear quiescent state in each stream for all applications for a | |
5215 | * specific UST session. | |
5216 | * Called with UST session lock held. | |
5217 | */ | |
5218 | static | |
5219 | int ust_app_clear_quiescent_session(struct ltt_ust_session *usess) | |
5220 | ||
5221 | { | |
5222 | int ret = 0; | |
5223 | ||
5224 | DBG("Clearing stream quiescent state for all ust apps"); | |
5225 | ||
5226 | rcu_read_lock(); | |
5227 | ||
5228 | switch (usess->buffer_type) { | |
5229 | case LTTNG_BUFFER_PER_UID: | |
5230 | { | |
5231 | struct lttng_ht_iter iter; | |
5232 | struct buffer_reg_uid *reg; | |
5233 | ||
5234 | /* | |
5235 | * Clear quiescent for all per UID buffers associated to | |
5236 | * that session. | |
5237 | */ | |
5238 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
5239 | struct consumer_socket *socket; | |
5240 | struct buffer_reg_channel *reg_chan; | |
5241 | ||
5242 | /* Get associated consumer socket.*/ | |
5243 | socket = consumer_find_socket_by_bitness( | |
5244 | reg->bits_per_long, usess->consumer); | |
5245 | if (!socket) { | |
5246 | /* | |
5247 | * Ignore request if no consumer is found for | |
5248 | * the session. | |
5249 | */ | |
5250 | continue; | |
5251 | } | |
5252 | ||
5253 | cds_lfht_for_each_entry(reg->registry->channels->ht, | |
5254 | &iter.iter, reg_chan, node.node) { | |
5255 | /* | |
5256 | * The following call will print error values so | |
5257 | * the return code is of little importance | |
5258 | * because whatever happens, we have to try them | |
5259 | * all. | |
5260 | */ | |
5261 | (void) consumer_clear_quiescent_channel(socket, | |
5262 | reg_chan->consumer_key); | |
5263 | } | |
5264 | } | |
5265 | break; | |
5266 | } | |
5267 | case LTTNG_BUFFER_PER_PID: | |
5268 | { | |
5269 | struct ust_app_session *ua_sess; | |
5270 | struct lttng_ht_iter iter; | |
5271 | struct ust_app *app; | |
5272 | ||
5273 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, | |
5274 | pid_n.node) { | |
5275 | ua_sess = lookup_session_by_app(usess, app); | |
5276 | if (ua_sess == NULL) { | |
5277 | continue; | |
5278 | } | |
5279 | (void) ust_app_clear_quiescent_app_session(app, | |
5280 | ua_sess); | |
5281 | } | |
5282 | break; | |
5283 | } | |
5284 | default: | |
5285 | ret = -1; | |
5286 | assert(0); | |
5287 | break; | |
5288 | } | |
5289 | ||
5290 | rcu_read_unlock(); | |
5291 | health_code_update(); | |
5292 | return ret; | |
5293 | } | |
5294 | ||
84cd17c6 MD |
5295 | /* |
5296 | * Destroy a specific UST session in apps. | |
5297 | */ | |
3353de95 | 5298 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 5299 | { |
ffe60014 | 5300 | int ret; |
84cd17c6 | 5301 | struct ust_app_session *ua_sess; |
bec39940 | 5302 | struct lttng_ht_iter iter; |
d9bf3ca4 | 5303 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 5304 | |
852d0037 | 5305 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
5306 | |
5307 | rcu_read_lock(); | |
5308 | ||
e0c7ec2b DG |
5309 | if (!app->compatible) { |
5310 | goto end; | |
5311 | } | |
5312 | ||
84cd17c6 | 5313 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 5314 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 5315 | if (node == NULL) { |
d42f20df DG |
5316 | /* Session is being or is deleted. */ |
5317 | goto end; | |
84cd17c6 MD |
5318 | } |
5319 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 5320 | |
840cb59c | 5321 | health_code_update(); |
d0b96690 | 5322 | destroy_app_session(app, ua_sess); |
84cd17c6 | 5323 | |
840cb59c | 5324 | health_code_update(); |
7db205b5 | 5325 | |
84cd17c6 | 5326 | /* Quiescent wait after stopping trace */ |
fb45065e | 5327 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 5328 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 5329 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
5330 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
5331 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
5332 | app->pid, ret); | |
5333 | } | |
e0c7ec2b DG |
5334 | end: |
5335 | rcu_read_unlock(); | |
840cb59c | 5336 | health_code_update(); |
84cd17c6 | 5337 | return 0; |
84cd17c6 MD |
5338 | } |
5339 | ||
5b4a0ec0 DG |
5340 | /* |
5341 | * Start tracing for the UST session. | |
5342 | */ | |
421cb601 DG |
5343 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
5344 | { | |
bec39940 | 5345 | struct lttng_ht_iter iter; |
421cb601 | 5346 | struct ust_app *app; |
48842b30 | 5347 | |
421cb601 DG |
5348 | DBG("Starting all UST traces"); |
5349 | ||
bb2452c8 MD |
5350 | /* |
5351 | * Even though the start trace might fail, flag this session active so | |
5352 | * other application coming in are started by default. | |
5353 | */ | |
5354 | usess->active = 1; | |
5355 | ||
421cb601 | 5356 | rcu_read_lock(); |
421cb601 | 5357 | |
0dd01979 MD |
5358 | /* |
5359 | * In a start-stop-start use-case, we need to clear the quiescent state | |
5360 | * of each channel set by the prior stop command, thus ensuring that a | |
5361 | * following stop or destroy is sure to grab a timestamp_end near those | |
5362 | * operations, even if the packet is empty. | |
5363 | */ | |
5364 | (void) ust_app_clear_quiescent_session(usess); | |
5365 | ||
0498a00c MD |
5366 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
5367 | ust_app_global_update(usess, app); | |
5368 | } | |
5369 | ||
48842b30 DG |
5370 | rcu_read_unlock(); |
5371 | ||
5372 | return 0; | |
5373 | } | |
487cf67c | 5374 | |
8be98f9a MD |
5375 | /* |
5376 | * Start tracing for the UST session. | |
ce34fcd0 | 5377 | * Called with UST session lock held. |
8be98f9a MD |
5378 | */ |
5379 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
5380 | { | |
5381 | int ret = 0; | |
bec39940 | 5382 | struct lttng_ht_iter iter; |
8be98f9a MD |
5383 | struct ust_app *app; |
5384 | ||
5385 | DBG("Stopping all UST traces"); | |
5386 | ||
bb2452c8 MD |
5387 | /* |
5388 | * Even though the stop trace might fail, flag this session inactive so | |
5389 | * other application coming in are not started by default. | |
5390 | */ | |
5391 | usess->active = 0; | |
5392 | ||
8be98f9a MD |
5393 | rcu_read_lock(); |
5394 | ||
b34cbebf MD |
5395 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
5396 | ret = ust_app_stop_trace(usess, app); | |
5397 | if (ret < 0) { | |
5398 | /* Continue to next apps even on error */ | |
5399 | continue; | |
5400 | } | |
5401 | } | |
5402 | ||
ce34fcd0 | 5403 | (void) ust_app_flush_session(usess); |
8be98f9a MD |
5404 | |
5405 | rcu_read_unlock(); | |
5406 | ||
5407 | return 0; | |
5408 | } | |
5409 | ||
84cd17c6 MD |
5410 | /* |
5411 | * Destroy app UST session. | |
5412 | */ | |
5413 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
5414 | { | |
5415 | int ret = 0; | |
bec39940 | 5416 | struct lttng_ht_iter iter; |
84cd17c6 MD |
5417 | struct ust_app *app; |
5418 | ||
5419 | DBG("Destroy all UST traces"); | |
5420 | ||
5421 | rcu_read_lock(); | |
5422 | ||
852d0037 | 5423 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 5424 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
5425 | if (ret < 0) { |
5426 | /* Continue to next apps even on error */ | |
5427 | continue; | |
5428 | } | |
5429 | } | |
5430 | ||
5431 | rcu_read_unlock(); | |
5432 | ||
5433 | return 0; | |
5434 | } | |
5435 | ||
88e3c2f5 | 5436 | /* The ua_sess lock must be held by the caller. */ |
a9ad0c8f | 5437 | static |
88e3c2f5 JG |
5438 | int find_or_create_ust_app_channel( |
5439 | struct ltt_ust_session *usess, | |
5440 | struct ust_app_session *ua_sess, | |
5441 | struct ust_app *app, | |
5442 | struct ltt_ust_channel *uchan, | |
5443 | struct ust_app_channel **ua_chan) | |
487cf67c | 5444 | { |
55c54cce | 5445 | int ret = 0; |
88e3c2f5 JG |
5446 | struct lttng_ht_iter iter; |
5447 | struct lttng_ht_node_str *ua_chan_node; | |
5448 | ||
5449 | lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &iter); | |
5450 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
5451 | if (ua_chan_node) { | |
5452 | *ua_chan = caa_container_of(ua_chan_node, | |
5453 | struct ust_app_channel, node); | |
5454 | goto end; | |
5455 | } | |
5456 | ||
5457 | ret = ust_app_channel_create(usess, ua_sess, uchan, app, ua_chan); | |
5458 | if (ret) { | |
5459 | goto end; | |
5460 | } | |
5461 | end: | |
5462 | return ret; | |
5463 | } | |
5464 | ||
5465 | static | |
5466 | int ust_app_channel_synchronize_event(struct ust_app_channel *ua_chan, | |
5467 | struct ltt_ust_event *uevent, struct ust_app_session *ua_sess, | |
5468 | struct ust_app *app) | |
5469 | { | |
5470 | int ret = 0; | |
5471 | struct ust_app_event *ua_event = NULL; | |
5472 | ||
5473 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
5474 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); | |
5475 | if (!ua_event) { | |
5476 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); | |
5477 | if (ret < 0) { | |
5478 | goto end; | |
5479 | } | |
5480 | } else { | |
5481 | if (ua_event->enabled != uevent->enabled) { | |
5482 | ret = uevent->enabled ? | |
5483 | enable_ust_app_event(ua_sess, ua_event, app) : | |
5484 | disable_ust_app_event(ua_sess, ua_event, app); | |
5485 | } | |
5486 | } | |
5487 | ||
5488 | end: | |
5489 | return ret; | |
5490 | } | |
5491 | ||
2463b787 JR |
5492 | static |
5493 | void ust_app_synchronize_tokens(struct ust_app *app) | |
5494 | { | |
5495 | int ret = 0; | |
5496 | enum lttng_error_code ret_code; | |
5497 | enum lttng_trigger_status t_status; | |
5498 | struct lttng_ht_iter app_trigger_iter; | |
5499 | struct lttng_triggers *triggers; | |
5500 | struct ust_app_token_event_rule *token_event_rule_element; | |
5501 | unsigned int count; | |
5502 | ||
5503 | rcu_read_lock(); | |
5504 | /* TODO: is this necessary to protect against new trigger being added ? | |
5505 | * notification_trigger_tokens_ht is still the backing data structure | |
5506 | * for this listing. Leave it there for now. | |
5507 | */ | |
5508 | pthread_mutex_lock(¬ification_trigger_tokens_ht_lock); | |
5509 | ret_code = notification_thread_command_get_tokens( | |
5510 | notification_thread_handle, &triggers); | |
5511 | if (ret_code != LTTNG_OK) { | |
5512 | ret = -1; | |
5513 | goto end; | |
5514 | } | |
5515 | ||
5516 | assert(triggers); | |
5517 | ||
5518 | t_status = lttng_triggers_get_count(triggers, &count); | |
5519 | if (t_status != LTTNG_TRIGGER_STATUS_OK) { | |
5520 | ret = -1; | |
5521 | goto end; | |
5522 | } | |
5523 | ||
5524 | for (unsigned int i = 0; i < count; i++) { | |
5525 | struct lttng_condition *condition; | |
5526 | struct lttng_event_rule *event_rule; | |
5527 | struct lttng_trigger *trigger; | |
5528 | struct ust_app_token_event_rule *ua_token; | |
5529 | uint64_t token; | |
5530 | ||
5531 | trigger = lttng_triggers_get_pointer_of_index(triggers, i); | |
5532 | assert(trigger); | |
5533 | ||
5534 | /* TODO: error checking and type checking */ | |
5535 | token = lttng_trigger_get_tracer_token(trigger); | |
5536 | condition = lttng_trigger_get_condition(trigger); | |
5537 | (void) lttng_condition_event_rule_get_rule_mutable(condition, &event_rule); | |
5538 | ||
5539 | if (lttng_event_rule_get_domain_type(event_rule) == LTTNG_DOMAIN_KERNEL) { | |
5540 | /* Skip kernel related trigger */ | |
5541 | continue; | |
5542 | } | |
5543 | ||
5544 | /* Iterate over all known token trigger */ | |
5545 | ua_token = find_ust_app_token_event_rule(app->tokens_ht, token); | |
5546 | if (!ua_token) { | |
5547 | ret = create_ust_app_token_event_rule(trigger, app); | |
5548 | if (ret < 0) { | |
5549 | goto end; | |
5550 | } | |
5551 | } | |
5552 | } | |
5553 | ||
5554 | /* Remove all unknown trigger from the app | |
5555 | * TODO find a way better way then this, do it on the unregister command | |
5556 | * and be specific on the token to remove instead of going over all | |
5557 | * trigger known to the app. This is sub optimal. | |
5558 | */ | |
5559 | cds_lfht_for_each_entry (app->tokens_ht->ht, &app_trigger_iter.iter, | |
5560 | token_event_rule_element, node.node) { | |
5561 | uint64_t token; | |
5562 | bool found = false; | |
5563 | ||
5564 | token = token_event_rule_element->token; | |
5565 | ||
5566 | /* | |
5567 | * Check if the app event trigger still exists on the | |
5568 | * notification side. | |
5569 | * TODO: might want to change the backing data struct of the | |
5570 | * lttng_triggers object to allow quick lookup? | |
5571 | * For kernel mostly all of this can be removed once we delete | |
5572 | * on a per trigger basis. | |
5573 | */ | |
5574 | ||
5575 | for (unsigned int i = 0; i < count; i++) { | |
5576 | struct lttng_trigger *trigger; | |
5577 | uint64_t inner_token; | |
5578 | ||
5579 | trigger = lttng_triggers_get_pointer_of_index( | |
5580 | triggers, i); | |
5581 | assert(trigger); | |
5582 | ||
5583 | inner_token = lttng_trigger_get_tracer_token(trigger); | |
5584 | ||
5585 | if (inner_token == token) { | |
5586 | found = true; | |
5587 | break; | |
5588 | } | |
5589 | } | |
5590 | ||
5591 | if (found) { | |
5592 | /* Still valid */ | |
5593 | continue; | |
5594 | } | |
5595 | ||
5596 | /* TODO: This is fucking ugly API for fuck sake */ | |
5597 | assert(!lttng_ht_del(app->tokens_ht, &app_trigger_iter)); | |
5598 | ||
5599 | (void) disable_ust_object(app, token_event_rule_element->obj); | |
5600 | ||
5601 | delete_ust_app_token_event_rule(app->sock, token_event_rule_element, app); | |
5602 | } | |
5603 | end: | |
5604 | lttng_triggers_destroy(triggers); | |
5605 | rcu_read_unlock(); | |
5606 | pthread_mutex_unlock(¬ification_trigger_tokens_ht_lock); | |
5607 | return; | |
5608 | } | |
5609 | ||
88e3c2f5 JG |
5610 | /* |
5611 | * The caller must ensure that the application is compatible and is tracked | |
2a3a1a2b | 5612 | * by the process attribute trackers. |
88e3c2f5 JG |
5613 | */ |
5614 | static | |
5615 | void ust_app_synchronize(struct ltt_ust_session *usess, | |
5616 | struct ust_app *app) | |
5617 | { | |
5618 | int ret = 0; | |
5619 | struct cds_lfht_iter uchan_iter; | |
5620 | struct ltt_ust_channel *uchan; | |
3d8ca23b | 5621 | struct ust_app_session *ua_sess = NULL; |
1f3580c7 | 5622 | |
88e3c2f5 JG |
5623 | /* |
5624 | * The application's configuration should only be synchronized for | |
5625 | * active sessions. | |
5626 | */ | |
5627 | assert(usess->active); | |
5628 | ||
5629 | ret = find_or_create_ust_app_session(usess, app, &ua_sess, NULL); | |
3d8ca23b DG |
5630 | if (ret < 0) { |
5631 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
5632 | goto error; |
5633 | } | |
3d8ca23b | 5634 | assert(ua_sess); |
487cf67c | 5635 | |
d0b96690 | 5636 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
5637 | if (ua_sess->deleted) { |
5638 | pthread_mutex_unlock(&ua_sess->lock); | |
5639 | goto end; | |
5640 | } | |
5641 | ||
88e3c2f5 JG |
5642 | rcu_read_lock(); |
5643 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &uchan_iter, | |
5644 | uchan, node.node) { | |
5645 | struct ust_app_channel *ua_chan; | |
5646 | struct cds_lfht_iter uevent_iter; | |
5647 | struct ltt_ust_event *uevent; | |
487cf67c | 5648 | |
31746f93 | 5649 | /* |
88e3c2f5 JG |
5650 | * Search for a matching ust_app_channel. If none is found, |
5651 | * create it. Creating the channel will cause the ua_chan | |
5652 | * structure to be allocated, the channel buffers to be | |
5653 | * allocated (if necessary) and sent to the application, and | |
5654 | * all enabled contexts will be added to the channel. | |
31746f93 | 5655 | */ |
f3db82be | 5656 | ret = find_or_create_ust_app_channel(usess, ua_sess, |
88e3c2f5 JG |
5657 | app, uchan, &ua_chan); |
5658 | if (ret) { | |
5659 | /* Tracer is probably gone or ENOMEM. */ | |
5660 | goto error_unlock; | |
727d5404 DG |
5661 | } |
5662 | ||
88e3c2f5 JG |
5663 | if (!ua_chan) { |
5664 | /* ua_chan will be NULL for the metadata channel */ | |
5665 | continue; | |
5666 | } | |
727d5404 | 5667 | |
88e3c2f5 | 5668 | cds_lfht_for_each_entry(uchan->events->ht, &uevent_iter, uevent, |
bec39940 | 5669 | node.node) { |
88e3c2f5 JG |
5670 | ret = ust_app_channel_synchronize_event(ua_chan, |
5671 | uevent, ua_sess, app); | |
5672 | if (ret) { | |
d0b96690 | 5673 | goto error_unlock; |
487cf67c | 5674 | } |
36dc12cc | 5675 | } |
d0b96690 | 5676 | |
88e3c2f5 JG |
5677 | if (ua_chan->enabled != uchan->enabled) { |
5678 | ret = uchan->enabled ? | |
5679 | enable_ust_app_channel(ua_sess, uchan, app) : | |
5680 | disable_ust_app_channel(ua_sess, ua_chan, app); | |
5681 | if (ret) { | |
5682 | goto error_unlock; | |
5683 | } | |
5684 | } | |
36dc12cc | 5685 | } |
88e3c2f5 | 5686 | rcu_read_unlock(); |
0498a00c | 5687 | |
a9ad0c8f | 5688 | end: |
88e3c2f5 | 5689 | pthread_mutex_unlock(&ua_sess->lock); |
ffe60014 | 5690 | /* Everything went well at this point. */ |
ffe60014 DG |
5691 | return; |
5692 | ||
d0b96690 | 5693 | error_unlock: |
88e3c2f5 | 5694 | rcu_read_unlock(); |
d0b96690 | 5695 | pthread_mutex_unlock(&ua_sess->lock); |
487cf67c | 5696 | error: |
ffe60014 | 5697 | if (ua_sess) { |
d0b96690 | 5698 | destroy_app_session(app, ua_sess); |
ffe60014 | 5699 | } |
487cf67c DG |
5700 | return; |
5701 | } | |
55cc08a6 | 5702 | |
a9ad0c8f MD |
5703 | static |
5704 | void ust_app_global_destroy(struct ltt_ust_session *usess, struct ust_app *app) | |
5705 | { | |
5706 | struct ust_app_session *ua_sess; | |
5707 | ||
5708 | ua_sess = lookup_session_by_app(usess, app); | |
5709 | if (ua_sess == NULL) { | |
5710 | return; | |
5711 | } | |
5712 | destroy_app_session(app, ua_sess); | |
5713 | } | |
5714 | ||
5715 | /* | |
5716 | * Add channels/events from UST global domain to registered apps at sock. | |
5717 | * | |
5718 | * Called with session lock held. | |
5719 | * Called with RCU read-side lock held. | |
5720 | */ | |
5721 | void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app) | |
5722 | { | |
5723 | assert(usess); | |
88e3c2f5 | 5724 | assert(usess->active); |
a9ad0c8f MD |
5725 | |
5726 | DBG2("UST app global update for app sock %d for session id %" PRIu64, | |
5727 | app->sock, usess->id); | |
5728 | ||
5729 | if (!app->compatible) { | |
5730 | return; | |
5731 | } | |
159b042f JG |
5732 | if (trace_ust_id_tracker_lookup(LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID, |
5733 | usess, app->pid) && | |
55c9e7ca | 5734 | trace_ust_id_tracker_lookup( |
159b042f JG |
5735 | LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID, |
5736 | usess, app->uid) && | |
55c9e7ca | 5737 | trace_ust_id_tracker_lookup( |
159b042f JG |
5738 | LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID, |
5739 | usess, app->gid)) { | |
88e3c2f5 JG |
5740 | /* |
5741 | * Synchronize the application's internal tracing configuration | |
5742 | * and start tracing. | |
5743 | */ | |
5744 | ust_app_synchronize(usess, app); | |
5745 | ust_app_start_trace(usess, app); | |
a9ad0c8f MD |
5746 | } else { |
5747 | ust_app_global_destroy(usess, app); | |
5748 | } | |
5749 | } | |
5750 | ||
2463b787 JR |
5751 | void ust_app_global_update_tokens(struct ust_app *app) |
5752 | { | |
5753 | DBG2("UST app global update token for app sock %d", app->sock); | |
5754 | ||
5755 | if (!app->compatible) { | |
5756 | return; | |
5757 | } | |
5758 | if (app->token_communication.handle == NULL) { | |
5759 | WARN("UST app global update token for app sock %d skipped since communcation handle is null", app->sock); | |
5760 | return; | |
5761 | } | |
5762 | ||
5763 | ust_app_synchronize_tokens(app); | |
5764 | } | |
5765 | ||
a9ad0c8f MD |
5766 | /* |
5767 | * Called with session lock held. | |
5768 | */ | |
5769 | void ust_app_global_update_all(struct ltt_ust_session *usess) | |
5770 | { | |
5771 | struct lttng_ht_iter iter; | |
5772 | struct ust_app *app; | |
5773 | ||
5774 | rcu_read_lock(); | |
5775 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5776 | ust_app_global_update(usess, app); | |
5777 | } | |
5778 | rcu_read_unlock(); | |
5779 | } | |
5780 | ||
2463b787 JR |
5781 | void ust_app_global_update_all_tokens(void) |
5782 | { | |
5783 | struct lttng_ht_iter iter; | |
5784 | struct ust_app *app; | |
5785 | ||
5786 | rcu_read_lock(); | |
5787 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5788 | ust_app_global_update_tokens(app); | |
5789 | } | |
5790 | rcu_read_unlock(); | |
5791 | } | |
5792 | ||
5793 | void ust_app_update_trigger_error_count(struct lttng_trigger *trigger) | |
5794 | { | |
5795 | uint64_t error_count = 0; | |
5796 | enum trigger_error_accounting_status status; | |
5797 | ||
5798 | status = trigger_error_accounting_get_count(trigger, &error_count); | |
5799 | if (status != TRIGGER_ERROR_ACCOUNTING_STATUS_OK) { | |
5800 | ERR("Error getting trigger error count"); | |
5801 | } | |
5802 | ||
5803 | lttng_trigger_set_error_count(trigger, error_count); | |
5804 | } | |
5805 | ||
55cc08a6 DG |
5806 | /* |
5807 | * Add context to a specific channel for global UST domain. | |
5808 | */ | |
5809 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
5810 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
5811 | { | |
5812 | int ret = 0; | |
bec39940 DG |
5813 | struct lttng_ht_node_str *ua_chan_node; |
5814 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
5815 | struct ust_app_channel *ua_chan = NULL; |
5816 | struct ust_app_session *ua_sess; | |
5817 | struct ust_app *app; | |
5818 | ||
88e3c2f5 | 5819 | assert(usess->active); |
0498a00c | 5820 | |
55cc08a6 | 5821 | rcu_read_lock(); |
852d0037 | 5822 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
5823 | if (!app->compatible) { |
5824 | /* | |
5825 | * TODO: In time, we should notice the caller of this error by | |
5826 | * telling him that this is a version error. | |
5827 | */ | |
5828 | continue; | |
5829 | } | |
55cc08a6 DG |
5830 | ua_sess = lookup_session_by_app(usess, app); |
5831 | if (ua_sess == NULL) { | |
5832 | continue; | |
5833 | } | |
5834 | ||
d0b96690 | 5835 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
5836 | |
5837 | if (ua_sess->deleted) { | |
5838 | pthread_mutex_unlock(&ua_sess->lock); | |
5839 | continue; | |
5840 | } | |
5841 | ||
55cc08a6 | 5842 | /* Lookup channel in the ust app session */ |
bec39940 DG |
5843 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
5844 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 5845 | if (ua_chan_node == NULL) { |
d0b96690 | 5846 | goto next_app; |
55cc08a6 DG |
5847 | } |
5848 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
5849 | node); | |
c9edf082 | 5850 | ret = create_ust_app_channel_context(ua_chan, &uctx->ctx, app); |
55cc08a6 | 5851 | if (ret < 0) { |
d0b96690 | 5852 | goto next_app; |
55cc08a6 | 5853 | } |
d0b96690 DG |
5854 | next_app: |
5855 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
5856 | } |
5857 | ||
55cc08a6 | 5858 | rcu_read_unlock(); |
76d45b40 DG |
5859 | return ret; |
5860 | } | |
7f79d3a1 | 5861 | |
d0b96690 DG |
5862 | /* |
5863 | * Receive registration and populate the given msg structure. | |
5864 | * | |
5865 | * On success return 0 else a negative value returned by the ustctl call. | |
5866 | */ | |
5867 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
5868 | { | |
5869 | int ret; | |
5870 | uint32_t pid, ppid, uid, gid; | |
5871 | ||
5872 | assert(msg); | |
5873 | ||
5874 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
5875 | &pid, &ppid, &uid, &gid, | |
5876 | &msg->bits_per_long, | |
5877 | &msg->uint8_t_alignment, | |
5878 | &msg->uint16_t_alignment, | |
5879 | &msg->uint32_t_alignment, | |
5880 | &msg->uint64_t_alignment, | |
5881 | &msg->long_alignment, | |
5882 | &msg->byte_order, | |
5883 | msg->name); | |
5884 | if (ret < 0) { | |
5885 | switch (-ret) { | |
5886 | case EPIPE: | |
5887 | case ECONNRESET: | |
5888 | case LTTNG_UST_ERR_EXITING: | |
5889 | DBG3("UST app recv reg message failed. Application died"); | |
5890 | break; | |
5891 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
5892 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
5893 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
5894 | LTTNG_UST_ABI_MINOR_VERSION); | |
5895 | break; | |
5896 | default: | |
5897 | ERR("UST app recv reg message failed with ret %d", ret); | |
5898 | break; | |
5899 | } | |
5900 | goto error; | |
5901 | } | |
5902 | msg->pid = (pid_t) pid; | |
5903 | msg->ppid = (pid_t) ppid; | |
5904 | msg->uid = (uid_t) uid; | |
5905 | msg->gid = (gid_t) gid; | |
5906 | ||
5907 | error: | |
5908 | return ret; | |
5909 | } | |
5910 | ||
10b56aef MD |
5911 | /* |
5912 | * Return a ust app session object using the application object and the | |
5913 | * session object descriptor has a key. If not found, NULL is returned. | |
5914 | * A RCU read side lock MUST be acquired when calling this function. | |
5915 | */ | |
5916 | static struct ust_app_session *find_session_by_objd(struct ust_app *app, | |
5917 | int objd) | |
5918 | { | |
5919 | struct lttng_ht_node_ulong *node; | |
5920 | struct lttng_ht_iter iter; | |
5921 | struct ust_app_session *ua_sess = NULL; | |
5922 | ||
5923 | assert(app); | |
5924 | ||
5925 | lttng_ht_lookup(app->ust_sessions_objd, (void *)((unsigned long) objd), &iter); | |
5926 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5927 | if (node == NULL) { | |
5928 | DBG2("UST app session find by objd %d not found", objd); | |
5929 | goto error; | |
5930 | } | |
5931 | ||
5932 | ua_sess = caa_container_of(node, struct ust_app_session, ust_objd_node); | |
5933 | ||
5934 | error: | |
5935 | return ua_sess; | |
5936 | } | |
5937 | ||
d88aee68 DG |
5938 | /* |
5939 | * Return a ust app channel object using the application object and the channel | |
5940 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
5941 | * lock MUST be acquired before calling this function. | |
5942 | */ | |
d0b96690 DG |
5943 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
5944 | int objd) | |
5945 | { | |
5946 | struct lttng_ht_node_ulong *node; | |
5947 | struct lttng_ht_iter iter; | |
5948 | struct ust_app_channel *ua_chan = NULL; | |
5949 | ||
5950 | assert(app); | |
5951 | ||
5952 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
5953 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5954 | if (node == NULL) { | |
5955 | DBG2("UST app channel find by objd %d not found", objd); | |
5956 | goto error; | |
5957 | } | |
5958 | ||
5959 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
5960 | ||
5961 | error: | |
5962 | return ua_chan; | |
5963 | } | |
5964 | ||
d88aee68 DG |
5965 | /* |
5966 | * Reply to a register channel notification from an application on the notify | |
5967 | * socket. The channel metadata is also created. | |
5968 | * | |
5969 | * The session UST registry lock is acquired in this function. | |
5970 | * | |
5971 | * On success 0 is returned else a negative value. | |
5972 | */ | |
8eede835 | 5973 | static int reply_ust_register_channel(int sock, int cobjd, |
d0b96690 DG |
5974 | size_t nr_fields, struct ustctl_field *fields) |
5975 | { | |
5976 | int ret, ret_code = 0; | |
294e218e | 5977 | uint32_t chan_id; |
7972aab2 | 5978 | uint64_t chan_reg_key; |
d0b96690 DG |
5979 | enum ustctl_channel_header type; |
5980 | struct ust_app *app; | |
5981 | struct ust_app_channel *ua_chan; | |
5982 | struct ust_app_session *ua_sess; | |
7972aab2 | 5983 | struct ust_registry_session *registry; |
45893984 | 5984 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
5985 | |
5986 | rcu_read_lock(); | |
5987 | ||
5988 | /* Lookup application. If not found, there is a code flow error. */ | |
5989 | app = find_app_by_notify_sock(sock); | |
d88aee68 | 5990 | if (!app) { |
fad1ed2f | 5991 | DBG("Application socket %d is being torn down. Abort event notify", |
d88aee68 DG |
5992 | sock); |
5993 | ret = 0; | |
5994 | goto error_rcu_unlock; | |
5995 | } | |
d0b96690 | 5996 | |
4950b860 | 5997 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 5998 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 | 5999 | if (!ua_chan) { |
fad1ed2f | 6000 | DBG("Application channel is being torn down. Abort event notify"); |
4950b860 MD |
6001 | ret = 0; |
6002 | goto error_rcu_unlock; | |
6003 | } | |
6004 | ||
d0b96690 DG |
6005 | assert(ua_chan->session); |
6006 | ua_sess = ua_chan->session; | |
d0b96690 | 6007 | |
7972aab2 DG |
6008 | /* Get right session registry depending on the session buffer type. */ |
6009 | registry = get_session_registry(ua_sess); | |
fad1ed2f JR |
6010 | if (!registry) { |
6011 | DBG("Application session is being torn down. Abort event notify"); | |
6012 | ret = 0; | |
6013 | goto error_rcu_unlock; | |
6014 | }; | |
45893984 | 6015 | |
7972aab2 DG |
6016 | /* Depending on the buffer type, a different channel key is used. */ |
6017 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
6018 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 6019 | } else { |
7972aab2 | 6020 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
6021 | } |
6022 | ||
7972aab2 DG |
6023 | pthread_mutex_lock(®istry->lock); |
6024 | ||
6025 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
6026 | assert(chan_reg); | |
6027 | ||
6028 | if (!chan_reg->register_done) { | |
294e218e MD |
6029 | /* |
6030 | * TODO: eventually use the registry event count for | |
6031 | * this channel to better guess header type for per-pid | |
6032 | * buffers. | |
6033 | */ | |
6034 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
7972aab2 DG |
6035 | chan_reg->nr_ctx_fields = nr_fields; |
6036 | chan_reg->ctx_fields = fields; | |
fad1ed2f | 6037 | fields = NULL; |
7972aab2 | 6038 | chan_reg->header_type = type; |
d0b96690 | 6039 | } else { |
7972aab2 DG |
6040 | /* Get current already assigned values. */ |
6041 | type = chan_reg->header_type; | |
d0b96690 | 6042 | } |
7972aab2 DG |
6043 | /* Channel id is set during the object creation. */ |
6044 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
6045 | |
6046 | /* Append to metadata */ | |
7972aab2 DG |
6047 | if (!chan_reg->metadata_dumped) { |
6048 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
6049 | if (ret_code) { |
6050 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
6051 | goto reply; | |
6052 | } | |
6053 | } | |
6054 | ||
6055 | reply: | |
7972aab2 DG |
6056 | DBG3("UST app replying to register channel key %" PRIu64 |
6057 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
6058 | ret_code); | |
d0b96690 DG |
6059 | |
6060 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
6061 | if (ret < 0) { | |
6062 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6063 | ERR("UST app reply channel failed with ret %d", ret); | |
6064 | } else { | |
6065 | DBG3("UST app reply channel failed. Application died"); | |
6066 | } | |
6067 | goto error; | |
6068 | } | |
6069 | ||
7972aab2 DG |
6070 | /* This channel registry registration is completed. */ |
6071 | chan_reg->register_done = 1; | |
6072 | ||
d0b96690 | 6073 | error: |
7972aab2 | 6074 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 6075 | error_rcu_unlock: |
d0b96690 | 6076 | rcu_read_unlock(); |
fad1ed2f | 6077 | free(fields); |
d0b96690 DG |
6078 | return ret; |
6079 | } | |
6080 | ||
d88aee68 DG |
6081 | /* |
6082 | * Add event to the UST channel registry. When the event is added to the | |
6083 | * registry, the metadata is also created. Once done, this replies to the | |
6084 | * application with the appropriate error code. | |
6085 | * | |
6086 | * The session UST registry lock is acquired in the function. | |
6087 | * | |
6088 | * On success 0 is returned else a negative value. | |
6089 | */ | |
d0b96690 | 6090 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
2106efa0 PP |
6091 | char *sig, size_t nr_fields, struct ustctl_field *fields, |
6092 | int loglevel_value, char *model_emf_uri) | |
d0b96690 DG |
6093 | { |
6094 | int ret, ret_code; | |
6095 | uint32_t event_id = 0; | |
7972aab2 | 6096 | uint64_t chan_reg_key; |
d0b96690 DG |
6097 | struct ust_app *app; |
6098 | struct ust_app_channel *ua_chan; | |
6099 | struct ust_app_session *ua_sess; | |
7972aab2 | 6100 | struct ust_registry_session *registry; |
d0b96690 DG |
6101 | |
6102 | rcu_read_lock(); | |
6103 | ||
6104 | /* Lookup application. If not found, there is a code flow error. */ | |
6105 | app = find_app_by_notify_sock(sock); | |
d88aee68 | 6106 | if (!app) { |
fad1ed2f | 6107 | DBG("Application socket %d is being torn down. Abort event notify", |
d88aee68 DG |
6108 | sock); |
6109 | ret = 0; | |
6110 | goto error_rcu_unlock; | |
6111 | } | |
d0b96690 | 6112 | |
4950b860 | 6113 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 6114 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 | 6115 | if (!ua_chan) { |
fad1ed2f | 6116 | DBG("Application channel is being torn down. Abort event notify"); |
4950b860 MD |
6117 | ret = 0; |
6118 | goto error_rcu_unlock; | |
6119 | } | |
6120 | ||
d0b96690 DG |
6121 | assert(ua_chan->session); |
6122 | ua_sess = ua_chan->session; | |
6123 | ||
7972aab2 | 6124 | registry = get_session_registry(ua_sess); |
fad1ed2f JR |
6125 | if (!registry) { |
6126 | DBG("Application session is being torn down. Abort event notify"); | |
6127 | ret = 0; | |
6128 | goto error_rcu_unlock; | |
6129 | } | |
7972aab2 DG |
6130 | |
6131 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
6132 | chan_reg_key = ua_chan->tracing_channel_id; | |
6133 | } else { | |
6134 | chan_reg_key = ua_chan->key; | |
6135 | } | |
6136 | ||
6137 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 6138 | |
d5d629b5 DG |
6139 | /* |
6140 | * From this point on, this call acquires the ownership of the sig, fields | |
6141 | * and model_emf_uri meaning any free are done inside it if needed. These | |
6142 | * three variables MUST NOT be read/write after this. | |
6143 | */ | |
7972aab2 | 6144 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
2106efa0 PP |
6145 | sobjd, cobjd, name, sig, nr_fields, fields, |
6146 | loglevel_value, model_emf_uri, ua_sess->buffer_type, | |
6147 | &event_id, app); | |
fad1ed2f JR |
6148 | sig = NULL; |
6149 | fields = NULL; | |
6150 | model_emf_uri = NULL; | |
d0b96690 DG |
6151 | |
6152 | /* | |
6153 | * The return value is returned to ustctl so in case of an error, the | |
6154 | * application can be notified. In case of an error, it's important not to | |
6155 | * return a negative error or else the application will get closed. | |
6156 | */ | |
6157 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
6158 | if (ret < 0) { | |
6159 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6160 | ERR("UST app reply event failed with ret %d", ret); | |
6161 | } else { | |
6162 | DBG3("UST app reply event failed. Application died"); | |
6163 | } | |
6164 | /* | |
6165 | * No need to wipe the create event since the application socket will | |
6166 | * get close on error hence cleaning up everything by itself. | |
6167 | */ | |
6168 | goto error; | |
6169 | } | |
6170 | ||
7972aab2 DG |
6171 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
6172 | name, event_id); | |
d88aee68 | 6173 | |
d0b96690 | 6174 | error: |
7972aab2 | 6175 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 6176 | error_rcu_unlock: |
d0b96690 | 6177 | rcu_read_unlock(); |
fad1ed2f JR |
6178 | free(sig); |
6179 | free(fields); | |
6180 | free(model_emf_uri); | |
d0b96690 DG |
6181 | return ret; |
6182 | } | |
6183 | ||
10b56aef MD |
6184 | /* |
6185 | * Add enum to the UST session registry. Once done, this replies to the | |
6186 | * application with the appropriate error code. | |
6187 | * | |
6188 | * The session UST registry lock is acquired within this function. | |
6189 | * | |
6190 | * On success 0 is returned else a negative value. | |
6191 | */ | |
6192 | static int add_enum_ust_registry(int sock, int sobjd, char *name, | |
6193 | struct ustctl_enum_entry *entries, size_t nr_entries) | |
6194 | { | |
6195 | int ret = 0, ret_code; | |
6196 | struct ust_app *app; | |
6197 | struct ust_app_session *ua_sess; | |
6198 | struct ust_registry_session *registry; | |
6199 | uint64_t enum_id = -1ULL; | |
6200 | ||
6201 | rcu_read_lock(); | |
6202 | ||
6203 | /* Lookup application. If not found, there is a code flow error. */ | |
6204 | app = find_app_by_notify_sock(sock); | |
6205 | if (!app) { | |
6206 | /* Return an error since this is not an error */ | |
6207 | DBG("Application socket %d is being torn down. Aborting enum registration", | |
6208 | sock); | |
6209 | free(entries); | |
6210 | goto error_rcu_unlock; | |
6211 | } | |
6212 | ||
6213 | /* Lookup session by UST object descriptor. */ | |
6214 | ua_sess = find_session_by_objd(app, sobjd); | |
6215 | if (!ua_sess) { | |
6216 | /* Return an error since this is not an error */ | |
fad1ed2f | 6217 | DBG("Application session is being torn down (session not found). Aborting enum registration."); |
10b56aef MD |
6218 | free(entries); |
6219 | goto error_rcu_unlock; | |
6220 | } | |
6221 | ||
6222 | registry = get_session_registry(ua_sess); | |
fad1ed2f JR |
6223 | if (!registry) { |
6224 | DBG("Application session is being torn down (registry not found). Aborting enum registration."); | |
6225 | free(entries); | |
6226 | goto error_rcu_unlock; | |
6227 | } | |
10b56aef MD |
6228 | |
6229 | pthread_mutex_lock(®istry->lock); | |
6230 | ||
6231 | /* | |
6232 | * From this point on, the callee acquires the ownership of | |
6233 | * entries. The variable entries MUST NOT be read/written after | |
6234 | * call. | |
6235 | */ | |
6236 | ret_code = ust_registry_create_or_find_enum(registry, sobjd, name, | |
6237 | entries, nr_entries, &enum_id); | |
6238 | entries = NULL; | |
6239 | ||
6240 | /* | |
6241 | * The return value is returned to ustctl so in case of an error, the | |
6242 | * application can be notified. In case of an error, it's important not to | |
6243 | * return a negative error or else the application will get closed. | |
6244 | */ | |
6245 | ret = ustctl_reply_register_enum(sock, enum_id, ret_code); | |
6246 | if (ret < 0) { | |
6247 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6248 | ERR("UST app reply enum failed with ret %d", ret); | |
6249 | } else { | |
6250 | DBG3("UST app reply enum failed. Application died"); | |
6251 | } | |
6252 | /* | |
6253 | * No need to wipe the create enum since the application socket will | |
6254 | * get close on error hence cleaning up everything by itself. | |
6255 | */ | |
6256 | goto error; | |
6257 | } | |
6258 | ||
6259 | DBG3("UST registry enum %s added successfully or already found", name); | |
6260 | ||
6261 | error: | |
6262 | pthread_mutex_unlock(®istry->lock); | |
6263 | error_rcu_unlock: | |
6264 | rcu_read_unlock(); | |
6265 | return ret; | |
6266 | } | |
6267 | ||
d88aee68 DG |
6268 | /* |
6269 | * Handle application notification through the given notify socket. | |
6270 | * | |
6271 | * Return 0 on success or else a negative value. | |
6272 | */ | |
d0b96690 DG |
6273 | int ust_app_recv_notify(int sock) |
6274 | { | |
6275 | int ret; | |
6276 | enum ustctl_notify_cmd cmd; | |
6277 | ||
6278 | DBG3("UST app receiving notify from sock %d", sock); | |
6279 | ||
6280 | ret = ustctl_recv_notify(sock, &cmd); | |
6281 | if (ret < 0) { | |
6282 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6283 | ERR("UST app recv notify failed with ret %d", ret); | |
6284 | } else { | |
6285 | DBG3("UST app recv notify failed. Application died"); | |
6286 | } | |
6287 | goto error; | |
6288 | } | |
6289 | ||
6290 | switch (cmd) { | |
6291 | case USTCTL_NOTIFY_CMD_EVENT: | |
6292 | { | |
2106efa0 | 6293 | int sobjd, cobjd, loglevel_value; |
d0b96690 DG |
6294 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; |
6295 | size_t nr_fields; | |
6296 | struct ustctl_field *fields; | |
6297 | ||
6298 | DBG2("UST app ustctl register event received"); | |
6299 | ||
2106efa0 PP |
6300 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, |
6301 | &loglevel_value, &sig, &nr_fields, &fields, | |
6302 | &model_emf_uri); | |
d0b96690 DG |
6303 | if (ret < 0) { |
6304 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6305 | ERR("UST app recv event failed with ret %d", ret); | |
6306 | } else { | |
6307 | DBG3("UST app recv event failed. Application died"); | |
6308 | } | |
6309 | goto error; | |
6310 | } | |
6311 | ||
d5d629b5 DG |
6312 | /* |
6313 | * Add event to the UST registry coming from the notify socket. This | |
6314 | * call will free if needed the sig, fields and model_emf_uri. This | |
6315 | * code path loses the ownsership of these variables and transfer them | |
6316 | * to the this function. | |
6317 | */ | |
d0b96690 | 6318 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
2106efa0 | 6319 | fields, loglevel_value, model_emf_uri); |
d0b96690 DG |
6320 | if (ret < 0) { |
6321 | goto error; | |
6322 | } | |
6323 | ||
6324 | break; | |
6325 | } | |
6326 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
6327 | { | |
6328 | int sobjd, cobjd; | |
6329 | size_t nr_fields; | |
6330 | struct ustctl_field *fields; | |
6331 | ||
6332 | DBG2("UST app ustctl register channel received"); | |
6333 | ||
6334 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
6335 | &fields); | |
6336 | if (ret < 0) { | |
6337 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6338 | ERR("UST app recv channel failed with ret %d", ret); | |
6339 | } else { | |
6340 | DBG3("UST app recv channel failed. Application died"); | |
6341 | } | |
6342 | goto error; | |
6343 | } | |
6344 | ||
d5d629b5 DG |
6345 | /* |
6346 | * The fields ownership are transfered to this function call meaning | |
6347 | * that if needed it will be freed. After this, it's invalid to access | |
6348 | * fields or clean it up. | |
6349 | */ | |
8eede835 | 6350 | ret = reply_ust_register_channel(sock, cobjd, nr_fields, |
d0b96690 DG |
6351 | fields); |
6352 | if (ret < 0) { | |
6353 | goto error; | |
6354 | } | |
6355 | ||
6356 | break; | |
6357 | } | |
10b56aef MD |
6358 | case USTCTL_NOTIFY_CMD_ENUM: |
6359 | { | |
6360 | int sobjd; | |
6361 | char name[LTTNG_UST_SYM_NAME_LEN]; | |
6362 | size_t nr_entries; | |
6363 | struct ustctl_enum_entry *entries; | |
6364 | ||
6365 | DBG2("UST app ustctl register enum received"); | |
6366 | ||
6367 | ret = ustctl_recv_register_enum(sock, &sobjd, name, | |
6368 | &entries, &nr_entries); | |
6369 | if (ret < 0) { | |
6370 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6371 | ERR("UST app recv enum failed with ret %d", ret); | |
6372 | } else { | |
6373 | DBG3("UST app recv enum failed. Application died"); | |
6374 | } | |
6375 | goto error; | |
6376 | } | |
6377 | ||
6378 | /* Callee assumes ownership of entries */ | |
6379 | ret = add_enum_ust_registry(sock, sobjd, name, | |
6380 | entries, nr_entries); | |
6381 | if (ret < 0) { | |
6382 | goto error; | |
6383 | } | |
6384 | ||
6385 | break; | |
6386 | } | |
d0b96690 DG |
6387 | default: |
6388 | /* Should NEVER happen. */ | |
6389 | assert(0); | |
6390 | } | |
6391 | ||
6392 | error: | |
6393 | return ret; | |
6394 | } | |
d88aee68 DG |
6395 | |
6396 | /* | |
6397 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
6398 | * corresponding application. On failure, the call_rcu to close the socket is | |
6399 | * executed. If an application is found, it tries to delete it from the notify | |
6400 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
6401 | * | |
6402 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
6403 | * call RCU is not done but the rest of the cleanup is. | |
6404 | */ | |
6405 | void ust_app_notify_sock_unregister(int sock) | |
6406 | { | |
6407 | int err_enomem = 0; | |
6408 | struct lttng_ht_iter iter; | |
6409 | struct ust_app *app; | |
6410 | struct ust_app_notify_sock_obj *obj; | |
6411 | ||
6412 | assert(sock >= 0); | |
6413 | ||
6414 | rcu_read_lock(); | |
6415 | ||
6416 | obj = zmalloc(sizeof(*obj)); | |
6417 | if (!obj) { | |
6418 | /* | |
6419 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
6420 | * procedure but the call_rcu will not be called. In this case, we | |
6421 | * accept the fd leak rather than possibly creating an unsynchronized | |
6422 | * state between threads. | |
6423 | * | |
6424 | * TODO: The notify object should be created once the notify socket is | |
6425 | * registered and stored independantely from the ust app object. The | |
6426 | * tricky part is to synchronize the teardown of the application and | |
6427 | * this notify object. Let's keep that in mind so we can avoid this | |
6428 | * kind of shenanigans with ENOMEM in the teardown path. | |
6429 | */ | |
6430 | err_enomem = 1; | |
6431 | } else { | |
6432 | obj->fd = sock; | |
6433 | } | |
6434 | ||
6435 | DBG("UST app notify socket unregister %d", sock); | |
6436 | ||
6437 | /* | |
6438 | * Lookup application by notify socket. If this fails, this means that the | |
6439 | * hash table delete has already been done by the application | |
6440 | * unregistration process so we can safely close the notify socket in a | |
6441 | * call RCU. | |
6442 | */ | |
6443 | app = find_app_by_notify_sock(sock); | |
6444 | if (!app) { | |
6445 | goto close_socket; | |
6446 | } | |
6447 | ||
6448 | iter.iter.node = &app->notify_sock_n.node; | |
6449 | ||
6450 | /* | |
6451 | * Whatever happens here either we fail or succeed, in both cases we have | |
6452 | * to close the socket after a grace period to continue to the call RCU | |
6453 | * here. If the deletion is successful, the application is not visible | |
6454 | * anymore by other threads and is it fails it means that it was already | |
6455 | * deleted from the hash table so either way we just have to close the | |
6456 | * socket. | |
6457 | */ | |
6458 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
6459 | ||
6460 | close_socket: | |
6461 | rcu_read_unlock(); | |
6462 | ||
6463 | /* | |
6464 | * Close socket after a grace period to avoid for the socket to be reused | |
6465 | * before the application object is freed creating potential race between | |
6466 | * threads trying to add unique in the global hash table. | |
6467 | */ | |
6468 | if (!err_enomem) { | |
6469 | call_rcu(&obj->head, close_notify_sock_rcu); | |
6470 | } | |
6471 | } | |
f45e313d DG |
6472 | |
6473 | /* | |
6474 | * Destroy a ust app data structure and free its memory. | |
6475 | */ | |
6476 | void ust_app_destroy(struct ust_app *app) | |
6477 | { | |
6478 | if (!app) { | |
6479 | return; | |
6480 | } | |
6481 | ||
6482 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
6483 | } | |
6dc3064a DG |
6484 | |
6485 | /* | |
6486 | * Take a snapshot for a given UST session. The snapshot is sent to the given | |
6487 | * output. | |
6488 | * | |
9a654598 | 6489 | * Returns LTTNG_OK on success or a LTTNG_ERR error code. |
6dc3064a | 6490 | */ |
fb9a95c4 JG |
6491 | enum lttng_error_code ust_app_snapshot_record( |
6492 | const struct ltt_ust_session *usess, | |
348a81dc | 6493 | const struct consumer_output *output, int wait, |
d07ceecd | 6494 | uint64_t nb_packets_per_stream) |
6dc3064a DG |
6495 | { |
6496 | int ret = 0; | |
9a654598 | 6497 | enum lttng_error_code status = LTTNG_OK; |
6dc3064a DG |
6498 | struct lttng_ht_iter iter; |
6499 | struct ust_app *app; | |
affce97e | 6500 | char *trace_path = NULL; |
6dc3064a DG |
6501 | |
6502 | assert(usess); | |
6503 | assert(output); | |
6504 | ||
6505 | rcu_read_lock(); | |
6506 | ||
8c924c7b MD |
6507 | switch (usess->buffer_type) { |
6508 | case LTTNG_BUFFER_PER_UID: | |
6509 | { | |
6510 | struct buffer_reg_uid *reg; | |
6dc3064a | 6511 | |
8c924c7b MD |
6512 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
6513 | struct buffer_reg_channel *reg_chan; | |
6514 | struct consumer_socket *socket; | |
3b967712 | 6515 | char pathname[PATH_MAX]; |
5da88b0f | 6516 | size_t consumer_path_offset = 0; |
6dc3064a | 6517 | |
2b269489 JR |
6518 | if (!reg->registry->reg.ust->metadata_key) { |
6519 | /* Skip since no metadata is present */ | |
6520 | continue; | |
6521 | } | |
6522 | ||
8c924c7b MD |
6523 | /* Get consumer socket to use to push the metadata.*/ |
6524 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
6525 | usess->consumer); | |
6526 | if (!socket) { | |
9a654598 | 6527 | status = LTTNG_ERR_INVALID; |
8c924c7b MD |
6528 | goto error; |
6529 | } | |
6dc3064a | 6530 | |
8c924c7b MD |
6531 | memset(pathname, 0, sizeof(pathname)); |
6532 | ret = snprintf(pathname, sizeof(pathname), | |
5da88b0f | 6533 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH, |
8c924c7b MD |
6534 | reg->uid, reg->bits_per_long); |
6535 | if (ret < 0) { | |
6536 | PERROR("snprintf snapshot path"); | |
9a654598 | 6537 | status = LTTNG_ERR_INVALID; |
8c924c7b MD |
6538 | goto error; |
6539 | } | |
affce97e JG |
6540 | /* Free path allowed on previous iteration. */ |
6541 | free(trace_path); | |
5da88b0f MD |
6542 | trace_path = setup_channel_trace_path(usess->consumer, pathname, |
6543 | &consumer_path_offset); | |
3b967712 MD |
6544 | if (!trace_path) { |
6545 | status = LTTNG_ERR_INVALID; | |
6546 | goto error; | |
6547 | } | |
f3db82be | 6548 | /* Add the UST default trace dir to path. */ |
8c924c7b MD |
6549 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
6550 | reg_chan, node.node) { | |
9a654598 | 6551 | status = consumer_snapshot_channel(socket, |
e098433c JG |
6552 | reg_chan->consumer_key, |
6553 | output, 0, usess->uid, | |
5da88b0f | 6554 | usess->gid, &trace_path[consumer_path_offset], wait, |
d2956687 | 6555 | nb_packets_per_stream); |
9a654598 | 6556 | if (status != LTTNG_OK) { |
8c924c7b MD |
6557 | goto error; |
6558 | } | |
6559 | } | |
9a654598 | 6560 | status = consumer_snapshot_channel(socket, |
68808f4e | 6561 | reg->registry->reg.ust->metadata_key, output, 1, |
5da88b0f MD |
6562 | usess->uid, usess->gid, &trace_path[consumer_path_offset], |
6563 | wait, 0); | |
9a654598 | 6564 | if (status != LTTNG_OK) { |
8c924c7b MD |
6565 | goto error; |
6566 | } | |
af706bb7 | 6567 | } |
8c924c7b MD |
6568 | break; |
6569 | } | |
6570 | case LTTNG_BUFFER_PER_PID: | |
6571 | { | |
6572 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6573 | struct consumer_socket *socket; | |
6574 | struct lttng_ht_iter chan_iter; | |
6575 | struct ust_app_channel *ua_chan; | |
6576 | struct ust_app_session *ua_sess; | |
6577 | struct ust_registry_session *registry; | |
3b967712 | 6578 | char pathname[PATH_MAX]; |
5da88b0f | 6579 | size_t consumer_path_offset = 0; |
8c924c7b MD |
6580 | |
6581 | ua_sess = lookup_session_by_app(usess, app); | |
6582 | if (!ua_sess) { | |
6583 | /* Session not associated with this app. */ | |
6584 | continue; | |
6585 | } | |
af706bb7 | 6586 | |
8c924c7b MD |
6587 | /* Get the right consumer socket for the application. */ |
6588 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
348a81dc | 6589 | output); |
8c924c7b | 6590 | if (!socket) { |
9a654598 | 6591 | status = LTTNG_ERR_INVALID; |
5c786ded JD |
6592 | goto error; |
6593 | } | |
6594 | ||
8c924c7b MD |
6595 | /* Add the UST default trace dir to path. */ |
6596 | memset(pathname, 0, sizeof(pathname)); | |
5da88b0f | 6597 | ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "/%s", |
8c924c7b | 6598 | ua_sess->path); |
6dc3064a | 6599 | if (ret < 0) { |
9a654598 | 6600 | status = LTTNG_ERR_INVALID; |
8c924c7b | 6601 | PERROR("snprintf snapshot path"); |
6dc3064a DG |
6602 | goto error; |
6603 | } | |
affce97e JG |
6604 | /* Free path allowed on previous iteration. */ |
6605 | free(trace_path); | |
5da88b0f MD |
6606 | trace_path = setup_channel_trace_path(usess->consumer, pathname, |
6607 | &consumer_path_offset); | |
3b967712 MD |
6608 | if (!trace_path) { |
6609 | status = LTTNG_ERR_INVALID; | |
6610 | goto error; | |
6611 | } | |
f3db82be | 6612 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, |
8c924c7b | 6613 | ua_chan, node.node) { |
9a654598 | 6614 | status = consumer_snapshot_channel(socket, |
470cc211 | 6615 | ua_chan->key, output, 0, |
2463b787 JR |
6616 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
6617 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
5da88b0f | 6618 | &trace_path[consumer_path_offset], wait, |
d2956687 | 6619 | nb_packets_per_stream); |
9a654598 JG |
6620 | switch (status) { |
6621 | case LTTNG_OK: | |
6622 | break; | |
6623 | case LTTNG_ERR_CHAN_NOT_FOUND: | |
6624 | continue; | |
6625 | default: | |
8c924c7b MD |
6626 | goto error; |
6627 | } | |
6628 | } | |
6629 | ||
6630 | registry = get_session_registry(ua_sess); | |
fad1ed2f | 6631 | if (!registry) { |
9bbfb88c MD |
6632 | DBG("Application session is being torn down. Skip application."); |
6633 | continue; | |
fad1ed2f | 6634 | } |
9a654598 | 6635 | status = consumer_snapshot_channel(socket, |
470cc211 | 6636 | registry->metadata_key, output, 1, |
2463b787 JR |
6637 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
6638 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
5da88b0f | 6639 | &trace_path[consumer_path_offset], wait, 0); |
9a654598 JG |
6640 | switch (status) { |
6641 | case LTTNG_OK: | |
6642 | break; | |
6643 | case LTTNG_ERR_CHAN_NOT_FOUND: | |
6644 | continue; | |
6645 | default: | |
8c924c7b MD |
6646 | goto error; |
6647 | } | |
6648 | } | |
6649 | break; | |
6650 | } | |
6651 | default: | |
6652 | assert(0); | |
6653 | break; | |
6dc3064a DG |
6654 | } |
6655 | ||
6656 | error: | |
affce97e | 6657 | free(trace_path); |
6dc3064a | 6658 | rcu_read_unlock(); |
9a654598 | 6659 | return status; |
6dc3064a | 6660 | } |
5c786ded JD |
6661 | |
6662 | /* | |
d07ceecd | 6663 | * Return the size taken by one more packet per stream. |
5c786ded | 6664 | */ |
fb9a95c4 JG |
6665 | uint64_t ust_app_get_size_one_more_packet_per_stream( |
6666 | const struct ltt_ust_session *usess, uint64_t cur_nr_packets) | |
5c786ded | 6667 | { |
d07ceecd | 6668 | uint64_t tot_size = 0; |
5c786ded JD |
6669 | struct ust_app *app; |
6670 | struct lttng_ht_iter iter; | |
6671 | ||
6672 | assert(usess); | |
6673 | ||
6674 | switch (usess->buffer_type) { | |
6675 | case LTTNG_BUFFER_PER_UID: | |
6676 | { | |
6677 | struct buffer_reg_uid *reg; | |
6678 | ||
6679 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
6680 | struct buffer_reg_channel *reg_chan; | |
6681 | ||
b7064eaa | 6682 | rcu_read_lock(); |
5c786ded JD |
6683 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
6684 | reg_chan, node.node) { | |
d07ceecd MD |
6685 | if (cur_nr_packets >= reg_chan->num_subbuf) { |
6686 | /* | |
6687 | * Don't take channel into account if we | |
6688 | * already grab all its packets. | |
6689 | */ | |
6690 | continue; | |
6691 | } | |
6692 | tot_size += reg_chan->subbuf_size * reg_chan->stream_count; | |
5c786ded | 6693 | } |
b7064eaa | 6694 | rcu_read_unlock(); |
5c786ded JD |
6695 | } |
6696 | break; | |
6697 | } | |
6698 | case LTTNG_BUFFER_PER_PID: | |
6699 | { | |
6700 | rcu_read_lock(); | |
6701 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6702 | struct ust_app_channel *ua_chan; | |
6703 | struct ust_app_session *ua_sess; | |
6704 | struct lttng_ht_iter chan_iter; | |
6705 | ||
6706 | ua_sess = lookup_session_by_app(usess, app); | |
6707 | if (!ua_sess) { | |
6708 | /* Session not associated with this app. */ | |
6709 | continue; | |
6710 | } | |
6711 | ||
6712 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
6713 | ua_chan, node.node) { | |
d07ceecd MD |
6714 | if (cur_nr_packets >= ua_chan->attr.num_subbuf) { |
6715 | /* | |
6716 | * Don't take channel into account if we | |
6717 | * already grab all its packets. | |
6718 | */ | |
6719 | continue; | |
6720 | } | |
6721 | tot_size += ua_chan->attr.subbuf_size * ua_chan->streams.count; | |
5c786ded JD |
6722 | } |
6723 | } | |
6724 | rcu_read_unlock(); | |
6725 | break; | |
6726 | } | |
6727 | default: | |
6728 | assert(0); | |
6729 | break; | |
6730 | } | |
6731 | ||
d07ceecd | 6732 | return tot_size; |
5c786ded | 6733 | } |
fb83fe64 JD |
6734 | |
6735 | int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id, | |
6736 | struct cds_list_head *buffer_reg_uid_list, | |
6737 | struct consumer_output *consumer, uint64_t uchan_id, | |
6738 | int overwrite, uint64_t *discarded, uint64_t *lost) | |
6739 | { | |
6740 | int ret; | |
6741 | uint64_t consumer_chan_key; | |
6742 | ||
70dd8162 MD |
6743 | *discarded = 0; |
6744 | *lost = 0; | |
6745 | ||
fb83fe64 | 6746 | ret = buffer_reg_uid_consumer_channel_key( |
76604852 | 6747 | buffer_reg_uid_list, uchan_id, &consumer_chan_key); |
fb83fe64 | 6748 | if (ret < 0) { |
70dd8162 MD |
6749 | /* Not found */ |
6750 | ret = 0; | |
fb83fe64 JD |
6751 | goto end; |
6752 | } | |
6753 | ||
6754 | if (overwrite) { | |
6755 | ret = consumer_get_lost_packets(ust_session_id, | |
6756 | consumer_chan_key, consumer, lost); | |
6757 | } else { | |
6758 | ret = consumer_get_discarded_events(ust_session_id, | |
6759 | consumer_chan_key, consumer, discarded); | |
6760 | } | |
6761 | ||
6762 | end: | |
6763 | return ret; | |
6764 | } | |
6765 | ||
6766 | int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess, | |
6767 | struct ltt_ust_channel *uchan, | |
6768 | struct consumer_output *consumer, int overwrite, | |
6769 | uint64_t *discarded, uint64_t *lost) | |
6770 | { | |
6771 | int ret = 0; | |
6772 | struct lttng_ht_iter iter; | |
6773 | struct lttng_ht_node_str *ua_chan_node; | |
6774 | struct ust_app *app; | |
6775 | struct ust_app_session *ua_sess; | |
6776 | struct ust_app_channel *ua_chan; | |
6777 | ||
70dd8162 MD |
6778 | *discarded = 0; |
6779 | *lost = 0; | |
6780 | ||
fb83fe64 JD |
6781 | rcu_read_lock(); |
6782 | /* | |
70dd8162 MD |
6783 | * Iterate over every registered applications. Sum counters for |
6784 | * all applications containing requested session and channel. | |
fb83fe64 JD |
6785 | */ |
6786 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6787 | struct lttng_ht_iter uiter; | |
6788 | ||
6789 | ua_sess = lookup_session_by_app(usess, app); | |
6790 | if (ua_sess == NULL) { | |
6791 | continue; | |
6792 | } | |
6793 | ||
6794 | /* Get channel */ | |
ee022399 | 6795 | lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &uiter); |
fb83fe64 JD |
6796 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); |
6797 | /* If the session is found for the app, the channel must be there */ | |
6798 | assert(ua_chan_node); | |
6799 | ||
6800 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
6801 | ||
6802 | if (overwrite) { | |
70dd8162 MD |
6803 | uint64_t _lost; |
6804 | ||
fb83fe64 | 6805 | ret = consumer_get_lost_packets(usess->id, ua_chan->key, |
70dd8162 MD |
6806 | consumer, &_lost); |
6807 | if (ret < 0) { | |
6808 | break; | |
6809 | } | |
6810 | (*lost) += _lost; | |
fb83fe64 | 6811 | } else { |
70dd8162 MD |
6812 | uint64_t _discarded; |
6813 | ||
fb83fe64 | 6814 | ret = consumer_get_discarded_events(usess->id, |
70dd8162 MD |
6815 | ua_chan->key, consumer, &_discarded); |
6816 | if (ret < 0) { | |
6817 | break; | |
6818 | } | |
6819 | (*discarded) += _discarded; | |
fb83fe64 | 6820 | } |
fb83fe64 JD |
6821 | } |
6822 | ||
fb83fe64 JD |
6823 | rcu_read_unlock(); |
6824 | return ret; | |
6825 | } | |
c2561365 JD |
6826 | |
6827 | static | |
6828 | int ust_app_regenerate_statedump(struct ltt_ust_session *usess, | |
6829 | struct ust_app *app) | |
6830 | { | |
6831 | int ret = 0; | |
6832 | struct ust_app_session *ua_sess; | |
6833 | ||
6834 | DBG("Regenerating the metadata for ust app pid %d", app->pid); | |
6835 | ||
6836 | rcu_read_lock(); | |
6837 | ||
6838 | ua_sess = lookup_session_by_app(usess, app); | |
6839 | if (ua_sess == NULL) { | |
6840 | /* The session is in teardown process. Ignore and continue. */ | |
6841 | goto end; | |
6842 | } | |
6843 | ||
6844 | pthread_mutex_lock(&ua_sess->lock); | |
6845 | ||
6846 | if (ua_sess->deleted) { | |
6847 | goto end_unlock; | |
6848 | } | |
6849 | ||
6850 | pthread_mutex_lock(&app->sock_lock); | |
6851 | ret = ustctl_regenerate_statedump(app->sock, ua_sess->handle); | |
6852 | pthread_mutex_unlock(&app->sock_lock); | |
6853 | ||
6854 | end_unlock: | |
6855 | pthread_mutex_unlock(&ua_sess->lock); | |
6856 | ||
6857 | end: | |
6858 | rcu_read_unlock(); | |
6859 | health_code_update(); | |
6860 | return ret; | |
6861 | } | |
6862 | ||
6863 | /* | |
6864 | * Regenerate the statedump for each app in the session. | |
6865 | */ | |
6866 | int ust_app_regenerate_statedump_all(struct ltt_ust_session *usess) | |
6867 | { | |
6868 | int ret = 0; | |
6869 | struct lttng_ht_iter iter; | |
6870 | struct ust_app *app; | |
6871 | ||
6872 | DBG("Regenerating the metadata for all UST apps"); | |
6873 | ||
6874 | rcu_read_lock(); | |
6875 | ||
6876 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6877 | if (!app->compatible) { | |
6878 | continue; | |
6879 | } | |
6880 | ||
6881 | ret = ust_app_regenerate_statedump(usess, app); | |
6882 | if (ret < 0) { | |
6883 | /* Continue to the next app even on error */ | |
6884 | continue; | |
6885 | } | |
6886 | } | |
6887 | ||
6888 | rcu_read_unlock(); | |
6889 | ||
6890 | return 0; | |
6891 | } | |
5c408ad8 JD |
6892 | |
6893 | /* | |
6894 | * Rotate all the channels of a session. | |
6895 | * | |
6f6d3b69 | 6896 | * Return LTTNG_OK on success or else an LTTng error code. |
5c408ad8 | 6897 | */ |
6f6d3b69 | 6898 | enum lttng_error_code ust_app_rotate_session(struct ltt_session *session) |
5c408ad8 | 6899 | { |
6f6d3b69 MD |
6900 | int ret; |
6901 | enum lttng_error_code cmd_ret = LTTNG_OK; | |
5c408ad8 JD |
6902 | struct lttng_ht_iter iter; |
6903 | struct ust_app *app; | |
6904 | struct ltt_ust_session *usess = session->ust_session; | |
5c408ad8 JD |
6905 | |
6906 | assert(usess); | |
6907 | ||
6908 | rcu_read_lock(); | |
6909 | ||
6910 | switch (usess->buffer_type) { | |
6911 | case LTTNG_BUFFER_PER_UID: | |
6912 | { | |
6913 | struct buffer_reg_uid *reg; | |
6914 | ||
6915 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
6916 | struct buffer_reg_channel *reg_chan; | |
6917 | struct consumer_socket *socket; | |
6918 | ||
14d3fca9 JR |
6919 | if (!reg->registry->reg.ust->metadata_key) { |
6920 | /* Skip since no metadata is present */ | |
6921 | continue; | |
6922 | } | |
6923 | ||
5c408ad8 JD |
6924 | /* Get consumer socket to use to push the metadata.*/ |
6925 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
6926 | usess->consumer); | |
6927 | if (!socket) { | |
6f6d3b69 | 6928 | cmd_ret = LTTNG_ERR_INVALID; |
5c408ad8 JD |
6929 | goto error; |
6930 | } | |
6931 | ||
5c408ad8 JD |
6932 | /* Rotate the data channels. */ |
6933 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
6934 | reg_chan, node.node) { | |
5c408ad8 JD |
6935 | ret = consumer_rotate_channel(socket, |
6936 | reg_chan->consumer_key, | |
6937 | usess->uid, usess->gid, | |
d2956687 JG |
6938 | usess->consumer, |
6939 | /* is_metadata_channel */ false); | |
5c408ad8 | 6940 | if (ret < 0) { |
6f6d3b69 | 6941 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
6942 | goto error; |
6943 | } | |
6944 | } | |
6945 | ||
6946 | (void) push_metadata(reg->registry->reg.ust, usess->consumer); | |
6947 | ||
6948 | ret = consumer_rotate_channel(socket, | |
6949 | reg->registry->reg.ust->metadata_key, | |
6950 | usess->uid, usess->gid, | |
d2956687 JG |
6951 | usess->consumer, |
6952 | /* is_metadata_channel */ true); | |
5c408ad8 | 6953 | if (ret < 0) { |
6f6d3b69 | 6954 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
6955 | goto error; |
6956 | } | |
5c408ad8 JD |
6957 | } |
6958 | break; | |
6959 | } | |
6960 | case LTTNG_BUFFER_PER_PID: | |
6961 | { | |
6962 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6963 | struct consumer_socket *socket; | |
6964 | struct lttng_ht_iter chan_iter; | |
6965 | struct ust_app_channel *ua_chan; | |
6966 | struct ust_app_session *ua_sess; | |
6967 | struct ust_registry_session *registry; | |
6968 | ||
6969 | ua_sess = lookup_session_by_app(usess, app); | |
6970 | if (!ua_sess) { | |
6971 | /* Session not associated with this app. */ | |
6972 | continue; | |
6973 | } | |
5c408ad8 JD |
6974 | |
6975 | /* Get the right consumer socket for the application. */ | |
6976 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
6977 | usess->consumer); | |
6978 | if (!socket) { | |
6f6d3b69 | 6979 | cmd_ret = LTTNG_ERR_INVALID; |
5c408ad8 JD |
6980 | goto error; |
6981 | } | |
6982 | ||
6983 | registry = get_session_registry(ua_sess); | |
6984 | if (!registry) { | |
6f6d3b69 MD |
6985 | DBG("Application session is being torn down. Skip application."); |
6986 | continue; | |
5c408ad8 JD |
6987 | } |
6988 | ||
5c408ad8 JD |
6989 | /* Rotate the data channels. */ |
6990 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
6991 | ua_chan, node.node) { | |
470cc211 JG |
6992 | ret = consumer_rotate_channel(socket, |
6993 | ua_chan->key, | |
2463b787 JR |
6994 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
6995 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
d2956687 JG |
6996 | ua_sess->consumer, |
6997 | /* is_metadata_channel */ false); | |
5c408ad8 | 6998 | if (ret < 0) { |
6f6d3b69 MD |
6999 | /* Per-PID buffer and application going away. */ |
7000 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) | |
7001 | continue; | |
7002 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; | |
5c408ad8 JD |
7003 | goto error; |
7004 | } | |
7005 | } | |
7006 | ||
7007 | /* Rotate the metadata channel. */ | |
7008 | (void) push_metadata(registry, usess->consumer); | |
470cc211 JG |
7009 | ret = consumer_rotate_channel(socket, |
7010 | registry->metadata_key, | |
2463b787 JR |
7011 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
7012 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
d2956687 JG |
7013 | ua_sess->consumer, |
7014 | /* is_metadata_channel */ true); | |
5c408ad8 | 7015 | if (ret < 0) { |
6f6d3b69 MD |
7016 | /* Per-PID buffer and application going away. */ |
7017 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) | |
7018 | continue; | |
7019 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; | |
5c408ad8 JD |
7020 | goto error; |
7021 | } | |
5c408ad8 JD |
7022 | } |
7023 | break; | |
7024 | } | |
7025 | default: | |
7026 | assert(0); | |
7027 | break; | |
7028 | } | |
7029 | ||
6f6d3b69 | 7030 | cmd_ret = LTTNG_OK; |
5c408ad8 JD |
7031 | |
7032 | error: | |
7033 | rcu_read_unlock(); | |
6f6d3b69 | 7034 | return cmd_ret; |
5c408ad8 | 7035 | } |
d2956687 JG |
7036 | |
7037 | enum lttng_error_code ust_app_create_channel_subdirectories( | |
7038 | const struct ltt_ust_session *usess) | |
7039 | { | |
7040 | enum lttng_error_code ret = LTTNG_OK; | |
7041 | struct lttng_ht_iter iter; | |
7042 | enum lttng_trace_chunk_status chunk_status; | |
7043 | char *pathname_index; | |
7044 | int fmt_ret; | |
7045 | ||
7046 | assert(usess->current_trace_chunk); | |
7047 | rcu_read_lock(); | |
7048 | ||
7049 | switch (usess->buffer_type) { | |
7050 | case LTTNG_BUFFER_PER_UID: | |
7051 | { | |
7052 | struct buffer_reg_uid *reg; | |
7053 | ||
7054 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
7055 | fmt_ret = asprintf(&pathname_index, | |
5da88b0f | 7056 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH "/" DEFAULT_INDEX_DIR, |
d2956687 JG |
7057 | reg->uid, reg->bits_per_long); |
7058 | if (fmt_ret < 0) { | |
7059 | ERR("Failed to format channel index directory"); | |
7060 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
7061 | goto error; | |
7062 | } | |
7063 | ||
7064 | /* | |
7065 | * Create the index subdirectory which will take care | |
7066 | * of implicitly creating the channel's path. | |
7067 | */ | |
7068 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
7069 | usess->current_trace_chunk, | |
7070 | pathname_index); | |
7071 | free(pathname_index); | |
7072 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
7073 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
7074 | goto error; | |
7075 | } | |
7076 | } | |
7077 | break; | |
7078 | } | |
7079 | case LTTNG_BUFFER_PER_PID: | |
7080 | { | |
7081 | struct ust_app *app; | |
7082 | ||
495dece5 MD |
7083 | /* |
7084 | * Create the toplevel ust/ directory in case no apps are running. | |
7085 | */ | |
7086 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
7087 | usess->current_trace_chunk, | |
7088 | DEFAULT_UST_TRACE_DIR); | |
7089 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
7090 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
7091 | goto error; | |
7092 | } | |
7093 | ||
d2956687 JG |
7094 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, |
7095 | pid_n.node) { | |
7096 | struct ust_app_session *ua_sess; | |
7097 | struct ust_registry_session *registry; | |
7098 | ||
7099 | ua_sess = lookup_session_by_app(usess, app); | |
7100 | if (!ua_sess) { | |
7101 | /* Session not associated with this app. */ | |
7102 | continue; | |
7103 | } | |
7104 | ||
7105 | registry = get_session_registry(ua_sess); | |
7106 | if (!registry) { | |
7107 | DBG("Application session is being torn down. Skip application."); | |
7108 | continue; | |
7109 | } | |
7110 | ||
7111 | fmt_ret = asprintf(&pathname_index, | |
5da88b0f | 7112 | DEFAULT_UST_TRACE_DIR "/%s/" DEFAULT_INDEX_DIR, |
d2956687 JG |
7113 | ua_sess->path); |
7114 | if (fmt_ret < 0) { | |
7115 | ERR("Failed to format channel index directory"); | |
7116 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
7117 | goto error; | |
7118 | } | |
7119 | /* | |
7120 | * Create the index subdirectory which will take care | |
7121 | * of implicitly creating the channel's path. | |
7122 | */ | |
7123 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
7124 | usess->current_trace_chunk, | |
7125 | pathname_index); | |
7126 | free(pathname_index); | |
7127 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
7128 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
7129 | goto error; | |
7130 | } | |
7131 | } | |
7132 | break; | |
7133 | } | |
7134 | default: | |
7135 | abort(); | |
7136 | } | |
7137 | ||
7138 | ret = LTTNG_OK; | |
7139 | error: | |
7140 | rcu_read_unlock(); | |
7141 | return ret; | |
7142 | } | |
4a9b9759 MD |
7143 | |
7144 | /* | |
7145 | * Clear all the channels of a session. | |
7146 | * | |
7147 | * Return LTTNG_OK on success or else an LTTng error code. | |
7148 | */ | |
7149 | enum lttng_error_code ust_app_clear_session(struct ltt_session *session) | |
7150 | { | |
7151 | int ret; | |
7152 | enum lttng_error_code cmd_ret = LTTNG_OK; | |
7153 | struct lttng_ht_iter iter; | |
7154 | struct ust_app *app; | |
7155 | struct ltt_ust_session *usess = session->ust_session; | |
7156 | ||
7157 | assert(usess); | |
7158 | ||
7159 | rcu_read_lock(); | |
7160 | ||
7161 | if (usess->active) { | |
7162 | ERR("Expecting inactive session %s (%" PRIu64 ")", session->name, session->id); | |
7163 | cmd_ret = LTTNG_ERR_FATAL; | |
7164 | goto end; | |
7165 | } | |
7166 | ||
7167 | switch (usess->buffer_type) { | |
7168 | case LTTNG_BUFFER_PER_UID: | |
7169 | { | |
7170 | struct buffer_reg_uid *reg; | |
7171 | ||
7172 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
7173 | struct buffer_reg_channel *reg_chan; | |
7174 | struct consumer_socket *socket; | |
7175 | ||
7176 | /* Get consumer socket to use to push the metadata.*/ | |
7177 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
7178 | usess->consumer); | |
7179 | if (!socket) { | |
7180 | cmd_ret = LTTNG_ERR_INVALID; | |
7181 | goto error_socket; | |
7182 | } | |
7183 | ||
7184 | /* Clear the data channels. */ | |
7185 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
7186 | reg_chan, node.node) { | |
7187 | ret = consumer_clear_channel(socket, | |
7188 | reg_chan->consumer_key); | |
7189 | if (ret < 0) { | |
7190 | goto error; | |
7191 | } | |
7192 | } | |
7193 | ||
7194 | (void) push_metadata(reg->registry->reg.ust, usess->consumer); | |
7195 | ||
7196 | /* | |
7197 | * Clear the metadata channel. | |
7198 | * Metadata channel is not cleared per se but we still need to | |
7199 | * perform a rotation operation on it behind the scene. | |
7200 | */ | |
7201 | ret = consumer_clear_channel(socket, | |
7202 | reg->registry->reg.ust->metadata_key); | |
7203 | if (ret < 0) { | |
7204 | goto error; | |
7205 | } | |
7206 | } | |
7207 | break; | |
7208 | } | |
7209 | case LTTNG_BUFFER_PER_PID: | |
7210 | { | |
7211 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
7212 | struct consumer_socket *socket; | |
7213 | struct lttng_ht_iter chan_iter; | |
7214 | struct ust_app_channel *ua_chan; | |
7215 | struct ust_app_session *ua_sess; | |
7216 | struct ust_registry_session *registry; | |
7217 | ||
7218 | ua_sess = lookup_session_by_app(usess, app); | |
7219 | if (!ua_sess) { | |
7220 | /* Session not associated with this app. */ | |
7221 | continue; | |
7222 | } | |
7223 | ||
7224 | /* Get the right consumer socket for the application. */ | |
7225 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
7226 | usess->consumer); | |
7227 | if (!socket) { | |
7228 | cmd_ret = LTTNG_ERR_INVALID; | |
7229 | goto error_socket; | |
7230 | } | |
7231 | ||
7232 | registry = get_session_registry(ua_sess); | |
7233 | if (!registry) { | |
7234 | DBG("Application session is being torn down. Skip application."); | |
7235 | continue; | |
7236 | } | |
7237 | ||
7238 | /* Clear the data channels. */ | |
7239 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
7240 | ua_chan, node.node) { | |
7241 | ret = consumer_clear_channel(socket, ua_chan->key); | |
7242 | if (ret < 0) { | |
7243 | /* Per-PID buffer and application going away. */ | |
7244 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) { | |
7245 | continue; | |
7246 | } | |
7247 | goto error; | |
7248 | } | |
7249 | } | |
7250 | ||
7251 | (void) push_metadata(registry, usess->consumer); | |
7252 | ||
7253 | /* | |
7254 | * Clear the metadata channel. | |
7255 | * Metadata channel is not cleared per se but we still need to | |
7256 | * perform rotation operation on it behind the scene. | |
7257 | */ | |
7258 | ret = consumer_clear_channel(socket, registry->metadata_key); | |
7259 | if (ret < 0) { | |
7260 | /* Per-PID buffer and application going away. */ | |
7261 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) { | |
7262 | continue; | |
7263 | } | |
7264 | goto error; | |
7265 | } | |
7266 | } | |
7267 | break; | |
7268 | } | |
7269 | default: | |
7270 | assert(0); | |
7271 | break; | |
7272 | } | |
7273 | ||
7274 | cmd_ret = LTTNG_OK; | |
7275 | goto end; | |
7276 | ||
7277 | error: | |
7278 | switch (-ret) { | |
7279 | case LTTCOMM_CONSUMERD_RELAYD_CLEAR_DISALLOWED: | |
7280 | cmd_ret = LTTNG_ERR_CLEAR_RELAY_DISALLOWED; | |
7281 | break; | |
7282 | default: | |
7283 | cmd_ret = LTTNG_ERR_CLEAR_FAIL_CONSUMER; | |
7284 | } | |
7285 | ||
7286 | error_socket: | |
7287 | end: | |
7288 | rcu_read_unlock(); | |
7289 | return cmd_ret; | |
7290 | } | |
04ed9e10 JG |
7291 | |
7292 | /* | |
7293 | * This function skips the metadata channel as the begin/end timestamps of a | |
7294 | * metadata packet are useless. | |
7295 | * | |
7296 | * Moreover, opening a packet after a "clear" will cause problems for live | |
7297 | * sessions as it will introduce padding that was not part of the first trace | |
7298 | * chunk. The relay daemon expects the content of the metadata stream of | |
7299 | * successive metadata trace chunks to be strict supersets of one another. | |
7300 | * | |
7301 | * For example, flushing a packet at the beginning of the metadata stream of | |
7302 | * a trace chunk resulting from a "clear" session command will cause the | |
7303 | * size of the metadata stream of the new trace chunk to not match the size of | |
7304 | * the metadata stream of the original chunk. This will confuse the relay | |
7305 | * daemon as the same "offset" in a metadata stream will no longer point | |
7306 | * to the same content. | |
7307 | */ | |
7308 | enum lttng_error_code ust_app_open_packets(struct ltt_session *session) | |
7309 | { | |
7310 | enum lttng_error_code ret = LTTNG_OK; | |
7311 | struct lttng_ht_iter iter; | |
7312 | struct ltt_ust_session *usess = session->ust_session; | |
7313 | ||
7314 | assert(usess); | |
7315 | ||
7316 | rcu_read_lock(); | |
7317 | ||
7318 | switch (usess->buffer_type) { | |
7319 | case LTTNG_BUFFER_PER_UID: | |
7320 | { | |
7321 | struct buffer_reg_uid *reg; | |
7322 | ||
7323 | cds_list_for_each_entry ( | |
7324 | reg, &usess->buffer_reg_uid_list, lnode) { | |
7325 | struct buffer_reg_channel *reg_chan; | |
7326 | struct consumer_socket *socket; | |
7327 | ||
7328 | socket = consumer_find_socket_by_bitness( | |
7329 | reg->bits_per_long, usess->consumer); | |
7330 | if (!socket) { | |
7331 | ret = LTTNG_ERR_FATAL; | |
7332 | goto error; | |
7333 | } | |
7334 | ||
7335 | cds_lfht_for_each_entry(reg->registry->channels->ht, | |
7336 | &iter.iter, reg_chan, node.node) { | |
7337 | const int open_ret = | |
7338 | consumer_open_channel_packets( | |
7339 | socket, | |
7340 | reg_chan->consumer_key); | |
7341 | ||
7342 | if (open_ret < 0) { | |
7343 | ret = LTTNG_ERR_UNK; | |
7344 | goto error; | |
7345 | } | |
7346 | } | |
7347 | } | |
7348 | break; | |
7349 | } | |
7350 | case LTTNG_BUFFER_PER_PID: | |
7351 | { | |
7352 | struct ust_app *app; | |
7353 | ||
7354 | cds_lfht_for_each_entry ( | |
7355 | ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
7356 | struct consumer_socket *socket; | |
7357 | struct lttng_ht_iter chan_iter; | |
7358 | struct ust_app_channel *ua_chan; | |
7359 | struct ust_app_session *ua_sess; | |
7360 | struct ust_registry_session *registry; | |
7361 | ||
7362 | ua_sess = lookup_session_by_app(usess, app); | |
7363 | if (!ua_sess) { | |
7364 | /* Session not associated with this app. */ | |
7365 | continue; | |
7366 | } | |
7367 | ||
7368 | /* Get the right consumer socket for the application. */ | |
7369 | socket = consumer_find_socket_by_bitness( | |
7370 | app->bits_per_long, usess->consumer); | |
7371 | if (!socket) { | |
7372 | ret = LTTNG_ERR_FATAL; | |
7373 | goto error; | |
7374 | } | |
7375 | ||
7376 | registry = get_session_registry(ua_sess); | |
7377 | if (!registry) { | |
7378 | DBG("Application session is being torn down. Skip application."); | |
7379 | continue; | |
7380 | } | |
7381 | ||
7382 | cds_lfht_for_each_entry(ua_sess->channels->ht, | |
7383 | &chan_iter.iter, ua_chan, node.node) { | |
7384 | const int open_ret = | |
7385 | consumer_open_channel_packets( | |
7386 | socket, | |
7387 | ua_chan->key); | |
7388 | ||
7389 | if (open_ret < 0) { | |
7390 | /* | |
7391 | * Per-PID buffer and application going | |
7392 | * away. | |
7393 | */ | |
97a171e1 | 7394 | if (open_ret == -LTTNG_ERR_CHAN_NOT_FOUND) { |
04ed9e10 JG |
7395 | continue; |
7396 | } | |
7397 | ||
7398 | ret = LTTNG_ERR_UNK; | |
7399 | goto error; | |
7400 | } | |
7401 | } | |
7402 | } | |
7403 | break; | |
7404 | } | |
7405 | default: | |
7406 | abort(); | |
7407 | break; | |
7408 | } | |
7409 | ||
7410 | error: | |
7411 | rcu_read_unlock(); | |
7412 | return ret; | |
7413 | } |