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> |
7972aab2 | 11 | #include <inttypes.h> |
91d76f53 DG |
12 | #include <pthread.h> |
13 | #include <stdio.h> | |
14 | #include <stdlib.h> | |
099e26bd | 15 | #include <string.h> |
aba8e916 DG |
16 | #include <sys/stat.h> |
17 | #include <sys/types.h> | |
099e26bd | 18 | #include <unistd.h> |
0df502fd | 19 | #include <urcu/compiler.h> |
331744e3 | 20 | #include <signal.h> |
bec39940 | 21 | |
990570ed | 22 | #include <common/common.h> |
d3a684ee JR |
23 | #include <common/hashtable/utils.h> |
24 | #include <lttng/event-rule/event-rule.h> | |
25 | #include <lttng/event-rule/event-rule-internal.h> | |
26 | #include <lttng/event-rule/tracepoint.h> | |
27 | #include <lttng/condition/condition.h> | |
28 | #include <lttng/condition/event-rule-internal.h> | |
29 | #include <lttng/condition/event-rule.h> | |
86acf0da | 30 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 31 | |
7972aab2 | 32 | #include "buffer-registry.h" |
86acf0da | 33 | #include "fd-limit.h" |
8782cc74 | 34 | #include "health-sessiond.h" |
56fff090 | 35 | #include "ust-app.h" |
48842b30 | 36 | #include "ust-consumer.h" |
75018ab6 JG |
37 | #include "lttng-ust-ctl.h" |
38 | #include "lttng-ust-error.h" | |
0b2dc8df | 39 | #include "utils.h" |
fb83fe64 | 40 | #include "session.h" |
e9404c27 JG |
41 | #include "lttng-sessiond.h" |
42 | #include "notification-thread-commands.h" | |
5c408ad8 | 43 | #include "rotate.h" |
d3a684ee | 44 | #include "event.h" |
d80a6244 | 45 | |
44cdb3a2 MJ |
46 | struct lttng_ht *ust_app_ht; |
47 | struct lttng_ht *ust_app_ht_by_sock; | |
48 | struct lttng_ht *ust_app_ht_by_notify_sock; | |
49 | ||
c4b88406 MD |
50 | static |
51 | int ust_app_flush_app_session(struct ust_app *app, struct ust_app_session *ua_sess); | |
52 | ||
d9bf3ca4 MD |
53 | /* Next available channel key. Access under next_channel_key_lock. */ |
54 | static uint64_t _next_channel_key; | |
55 | static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER; | |
56 | ||
57 | /* Next available session ID. Access under next_session_id_lock. */ | |
58 | static uint64_t _next_session_id; | |
59 | static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER; | |
ffe60014 DG |
60 | |
61 | /* | |
d9bf3ca4 | 62 | * Return the incremented value of next_channel_key. |
ffe60014 | 63 | */ |
d9bf3ca4 | 64 | static uint64_t get_next_channel_key(void) |
ffe60014 | 65 | { |
d9bf3ca4 MD |
66 | uint64_t ret; |
67 | ||
68 | pthread_mutex_lock(&next_channel_key_lock); | |
69 | ret = ++_next_channel_key; | |
70 | pthread_mutex_unlock(&next_channel_key_lock); | |
71 | return ret; | |
ffe60014 DG |
72 | } |
73 | ||
74 | /* | |
7972aab2 | 75 | * Return the atomically incremented value of next_session_id. |
ffe60014 | 76 | */ |
d9bf3ca4 | 77 | static uint64_t get_next_session_id(void) |
ffe60014 | 78 | { |
d9bf3ca4 MD |
79 | uint64_t ret; |
80 | ||
81 | pthread_mutex_lock(&next_session_id_lock); | |
82 | ret = ++_next_session_id; | |
83 | pthread_mutex_unlock(&next_session_id_lock); | |
84 | return ret; | |
ffe60014 DG |
85 | } |
86 | ||
d65d2de8 DG |
87 | static void copy_channel_attr_to_ustctl( |
88 | struct ustctl_consumer_channel_attr *attr, | |
89 | struct lttng_ust_channel_attr *uattr) | |
90 | { | |
91 | /* Copy event attributes since the layout is different. */ | |
92 | attr->subbuf_size = uattr->subbuf_size; | |
93 | attr->num_subbuf = uattr->num_subbuf; | |
94 | attr->overwrite = uattr->overwrite; | |
95 | attr->switch_timer_interval = uattr->switch_timer_interval; | |
96 | attr->read_timer_interval = uattr->read_timer_interval; | |
97 | attr->output = uattr->output; | |
491d1539 | 98 | attr->blocking_timeout = uattr->u.s.blocking_timeout; |
d65d2de8 DG |
99 | } |
100 | ||
025faf73 DG |
101 | /* |
102 | * Match function for the hash table lookup. | |
103 | * | |
104 | * It matches an ust app event based on three attributes which are the event | |
105 | * name, the filter bytecode and the loglevel. | |
106 | */ | |
18eace3b DG |
107 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
108 | { | |
109 | struct ust_app_event *event; | |
110 | const struct ust_app_ht_key *key; | |
2106efa0 | 111 | int ev_loglevel_value; |
18eace3b DG |
112 | |
113 | assert(node); | |
114 | assert(_key); | |
115 | ||
116 | event = caa_container_of(node, struct ust_app_event, node.node); | |
117 | key = _key; | |
2106efa0 | 118 | ev_loglevel_value = event->attr.loglevel; |
18eace3b | 119 | |
1af53eb5 | 120 | /* Match the 4 elements of the key: name, filter, loglevel, exclusions */ |
18eace3b DG |
121 | |
122 | /* Event name */ | |
123 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
124 | goto no_match; | |
125 | } | |
126 | ||
127 | /* Event loglevel. */ | |
2106efa0 | 128 | if (ev_loglevel_value != key->loglevel_type) { |
025faf73 | 129 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
2106efa0 PP |
130 | && key->loglevel_type == 0 && |
131 | ev_loglevel_value == -1) { | |
025faf73 DG |
132 | /* |
133 | * Match is accepted. This is because on event creation, the | |
134 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
135 | * -1 are accepted for this loglevel type since 0 is the one set by | |
136 | * the API when receiving an enable event. | |
137 | */ | |
138 | } else { | |
139 | goto no_match; | |
140 | } | |
18eace3b DG |
141 | } |
142 | ||
143 | /* One of the filters is NULL, fail. */ | |
144 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
145 | goto no_match; | |
146 | } | |
147 | ||
025faf73 DG |
148 | if (key->filter && event->filter) { |
149 | /* Both filters exists, check length followed by the bytecode. */ | |
150 | if (event->filter->len != key->filter->len || | |
151 | memcmp(event->filter->data, key->filter->data, | |
152 | event->filter->len) != 0) { | |
153 | goto no_match; | |
154 | } | |
18eace3b DG |
155 | } |
156 | ||
1af53eb5 JI |
157 | /* One of the exclusions is NULL, fail. */ |
158 | if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) { | |
159 | goto no_match; | |
160 | } | |
161 | ||
162 | if (key->exclusion && event->exclusion) { | |
163 | /* Both exclusions exists, check count followed by the names. */ | |
164 | if (event->exclusion->count != key->exclusion->count || | |
165 | memcmp(event->exclusion->names, key->exclusion->names, | |
166 | event->exclusion->count * LTTNG_UST_SYM_NAME_LEN) != 0) { | |
167 | goto no_match; | |
168 | } | |
169 | } | |
170 | ||
171 | ||
025faf73 | 172 | /* Match. */ |
18eace3b DG |
173 | return 1; |
174 | ||
175 | no_match: | |
176 | return 0; | |
18eace3b DG |
177 | } |
178 | ||
025faf73 DG |
179 | /* |
180 | * Unique add of an ust app event in the given ht. This uses the custom | |
181 | * ht_match_ust_app_event match function and the event name as hash. | |
182 | */ | |
d0b96690 | 183 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
184 | struct ust_app_event *event) |
185 | { | |
186 | struct cds_lfht_node *node_ptr; | |
187 | struct ust_app_ht_key key; | |
d0b96690 | 188 | struct lttng_ht *ht; |
18eace3b | 189 | |
d0b96690 DG |
190 | assert(ua_chan); |
191 | assert(ua_chan->events); | |
18eace3b DG |
192 | assert(event); |
193 | ||
d0b96690 | 194 | ht = ua_chan->events; |
18eace3b DG |
195 | key.name = event->attr.name; |
196 | key.filter = event->filter; | |
2106efa0 | 197 | key.loglevel_type = event->attr.loglevel; |
91c89f23 | 198 | key.exclusion = event->exclusion; |
18eace3b DG |
199 | |
200 | node_ptr = cds_lfht_add_unique(ht->ht, | |
201 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
202 | ht_match_ust_app_event, &key, &event->node.node); | |
203 | assert(node_ptr == &event->node.node); | |
204 | } | |
205 | ||
d88aee68 DG |
206 | /* |
207 | * Close the notify socket from the given RCU head object. This MUST be called | |
208 | * through a call_rcu(). | |
209 | */ | |
210 | static void close_notify_sock_rcu(struct rcu_head *head) | |
211 | { | |
212 | int ret; | |
213 | struct ust_app_notify_sock_obj *obj = | |
214 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
215 | ||
216 | /* Must have a valid fd here. */ | |
217 | assert(obj->fd >= 0); | |
218 | ||
219 | ret = close(obj->fd); | |
220 | if (ret) { | |
221 | ERR("close notify sock %d RCU", obj->fd); | |
222 | } | |
223 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
224 | ||
225 | free(obj); | |
226 | } | |
227 | ||
7972aab2 DG |
228 | /* |
229 | * Return the session registry according to the buffer type of the given | |
230 | * session. | |
231 | * | |
232 | * A registry per UID object MUST exists before calling this function or else | |
233 | * it assert() if not found. RCU read side lock must be acquired. | |
234 | */ | |
235 | static struct ust_registry_session *get_session_registry( | |
236 | struct ust_app_session *ua_sess) | |
237 | { | |
238 | struct ust_registry_session *registry = NULL; | |
239 | ||
240 | assert(ua_sess); | |
241 | ||
242 | switch (ua_sess->buffer_type) { | |
243 | case LTTNG_BUFFER_PER_PID: | |
244 | { | |
245 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
246 | if (!reg_pid) { | |
247 | goto error; | |
248 | } | |
249 | registry = reg_pid->registry->reg.ust; | |
250 | break; | |
251 | } | |
252 | case LTTNG_BUFFER_PER_UID: | |
253 | { | |
254 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
470cc211 JG |
255 | ua_sess->tracing_id, ua_sess->bits_per_long, |
256 | ua_sess->real_credentials.uid); | |
7972aab2 DG |
257 | if (!reg_uid) { |
258 | goto error; | |
259 | } | |
260 | registry = reg_uid->registry->reg.ust; | |
261 | break; | |
262 | } | |
263 | default: | |
264 | assert(0); | |
265 | }; | |
266 | ||
267 | error: | |
268 | return registry; | |
269 | } | |
270 | ||
55cc08a6 DG |
271 | /* |
272 | * Delete ust context safely. RCU read lock must be held before calling | |
273 | * this function. | |
274 | */ | |
275 | static | |
fb45065e MD |
276 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx, |
277 | struct ust_app *app) | |
55cc08a6 | 278 | { |
ffe60014 DG |
279 | int ret; |
280 | ||
281 | assert(ua_ctx); | |
282 | ||
55cc08a6 | 283 | if (ua_ctx->obj) { |
fb45065e | 284 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 285 | ret = ustctl_release_object(sock, ua_ctx->obj); |
fb45065e | 286 | pthread_mutex_unlock(&app->sock_lock); |
d0b96690 DG |
287 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
288 | ERR("UST app sock %d release ctx obj handle %d failed with ret %d", | |
289 | sock, ua_ctx->obj->handle, ret); | |
ffe60014 | 290 | } |
55cc08a6 DG |
291 | free(ua_ctx->obj); |
292 | } | |
293 | free(ua_ctx); | |
294 | } | |
295 | ||
d80a6244 DG |
296 | /* |
297 | * Delete ust app event safely. RCU read lock must be held before calling | |
298 | * this function. | |
299 | */ | |
8b366481 | 300 | static |
fb45065e MD |
301 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event, |
302 | struct ust_app *app) | |
d80a6244 | 303 | { |
ffe60014 DG |
304 | int ret; |
305 | ||
306 | assert(ua_event); | |
307 | ||
53a80697 | 308 | free(ua_event->filter); |
951f0b71 JI |
309 | if (ua_event->exclusion != NULL) |
310 | free(ua_event->exclusion); | |
edb67388 | 311 | if (ua_event->obj != NULL) { |
fb45065e | 312 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 313 | ret = ustctl_release_object(sock, ua_event->obj); |
fb45065e | 314 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
315 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
316 | ERR("UST app sock %d release event obj failed with ret %d", | |
317 | sock, ret); | |
318 | } | |
edb67388 DG |
319 | free(ua_event->obj); |
320 | } | |
d80a6244 DG |
321 | free(ua_event); |
322 | } | |
323 | ||
d3a684ee JR |
324 | /* |
325 | * Delete ust app token event_rule safely. RCU read lock must be held before calling | |
326 | * this function. TODO: or does it???? | |
327 | */ | |
328 | static | |
329 | void delete_ust_app_token_event_rule(int sock, struct ust_app_token_event_rule *ua_token, | |
330 | struct ust_app *app) | |
331 | { | |
332 | int ret; | |
333 | ||
334 | assert(ua_token); | |
335 | ||
336 | if (ua_token->exclusion != NULL) | |
337 | free(ua_token->exclusion); | |
338 | if (ua_token->obj != NULL) { | |
339 | pthread_mutex_lock(&app->sock_lock); | |
340 | ret = ustctl_release_object(sock, ua_token->obj); | |
341 | pthread_mutex_unlock(&app->sock_lock); | |
342 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
343 | ERR("UST app sock %d release event obj failed with ret %d", | |
344 | sock, ret); | |
345 | } | |
346 | free(ua_token->obj); | |
347 | } | |
348 | lttng_event_rule_put(ua_token->event_rule); | |
349 | free(ua_token); | |
350 | } | |
351 | ||
d80a6244 | 352 | /* |
7972aab2 DG |
353 | * Release ust data object of the given stream. |
354 | * | |
355 | * Return 0 on success or else a negative value. | |
d80a6244 | 356 | */ |
fb45065e MD |
357 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream, |
358 | struct ust_app *app) | |
d80a6244 | 359 | { |
7972aab2 | 360 | int ret = 0; |
ffe60014 DG |
361 | |
362 | assert(stream); | |
363 | ||
8b366481 | 364 | if (stream->obj) { |
fb45065e | 365 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 366 | ret = ustctl_release_object(sock, stream->obj); |
fb45065e | 367 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
368 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
369 | ERR("UST app sock %d release stream obj failed with ret %d", | |
370 | sock, ret); | |
371 | } | |
4063050c | 372 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
373 | free(stream->obj); |
374 | } | |
7972aab2 DG |
375 | |
376 | return ret; | |
377 | } | |
378 | ||
379 | /* | |
380 | * Delete ust app stream safely. RCU read lock must be held before calling | |
381 | * this function. | |
382 | */ | |
383 | static | |
fb45065e MD |
384 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream, |
385 | struct ust_app *app) | |
7972aab2 DG |
386 | { |
387 | assert(stream); | |
388 | ||
fb45065e | 389 | (void) release_ust_app_stream(sock, stream, app); |
84cd17c6 | 390 | free(stream); |
d80a6244 DG |
391 | } |
392 | ||
36b588ed MD |
393 | /* |
394 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
395 | * section and outside of call_rcu thread, so we postpone its execution |
396 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
397 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
398 | */ |
399 | static | |
400 | void delete_ust_app_channel_rcu(struct rcu_head *head) | |
401 | { | |
402 | struct ust_app_channel *ua_chan = | |
403 | caa_container_of(head, struct ust_app_channel, rcu_head); | |
404 | ||
0b2dc8df MD |
405 | ht_cleanup_push(ua_chan->ctx); |
406 | ht_cleanup_push(ua_chan->events); | |
36b588ed MD |
407 | free(ua_chan); |
408 | } | |
409 | ||
fb83fe64 JD |
410 | /* |
411 | * Extract the lost packet or discarded events counter when the channel is | |
412 | * being deleted and store the value in the parent channel so we can | |
413 | * access it from lttng list and at stop/destroy. | |
82cac6d2 JG |
414 | * |
415 | * The session list lock must be held by the caller. | |
fb83fe64 JD |
416 | */ |
417 | static | |
418 | void save_per_pid_lost_discarded_counters(struct ust_app_channel *ua_chan) | |
419 | { | |
420 | uint64_t discarded = 0, lost = 0; | |
421 | struct ltt_session *session; | |
422 | struct ltt_ust_channel *uchan; | |
423 | ||
424 | if (ua_chan->attr.type != LTTNG_UST_CHAN_PER_CPU) { | |
425 | return; | |
426 | } | |
427 | ||
428 | rcu_read_lock(); | |
429 | session = session_find_by_id(ua_chan->session->tracing_id); | |
d68ec974 JG |
430 | if (!session || !session->ust_session) { |
431 | /* | |
432 | * Not finding the session is not an error because there are | |
433 | * multiple ways the channels can be torn down. | |
434 | * | |
435 | * 1) The session daemon can initiate the destruction of the | |
436 | * ust app session after receiving a destroy command or | |
437 | * during its shutdown/teardown. | |
438 | * 2) The application, since we are in per-pid tracing, is | |
439 | * unregistering and tearing down its ust app session. | |
440 | * | |
441 | * Both paths are protected by the session list lock which | |
442 | * ensures that the accounting of lost packets and discarded | |
443 | * events is done exactly once. The session is then unpublished | |
444 | * from the session list, resulting in this condition. | |
445 | */ | |
fb83fe64 JD |
446 | goto end; |
447 | } | |
448 | ||
449 | if (ua_chan->attr.overwrite) { | |
450 | consumer_get_lost_packets(ua_chan->session->tracing_id, | |
451 | ua_chan->key, session->ust_session->consumer, | |
452 | &lost); | |
453 | } else { | |
454 | consumer_get_discarded_events(ua_chan->session->tracing_id, | |
455 | ua_chan->key, session->ust_session->consumer, | |
456 | &discarded); | |
457 | } | |
458 | uchan = trace_ust_find_channel_by_name( | |
459 | session->ust_session->domain_global.channels, | |
460 | ua_chan->name); | |
461 | if (!uchan) { | |
462 | ERR("Missing UST channel to store discarded counters"); | |
463 | goto end; | |
464 | } | |
465 | ||
466 | uchan->per_pid_closed_app_discarded += discarded; | |
467 | uchan->per_pid_closed_app_lost += lost; | |
468 | ||
469 | end: | |
470 | rcu_read_unlock(); | |
e32d7f27 JG |
471 | if (session) { |
472 | session_put(session); | |
473 | } | |
fb83fe64 JD |
474 | } |
475 | ||
d80a6244 DG |
476 | /* |
477 | * Delete ust app channel safely. RCU read lock must be held before calling | |
478 | * this function. | |
82cac6d2 JG |
479 | * |
480 | * The session list lock must be held by the caller. | |
d80a6244 | 481 | */ |
8b366481 | 482 | static |
d0b96690 DG |
483 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
484 | struct ust_app *app) | |
d80a6244 DG |
485 | { |
486 | int ret; | |
bec39940 | 487 | struct lttng_ht_iter iter; |
d80a6244 | 488 | struct ust_app_event *ua_event; |
55cc08a6 | 489 | struct ust_app_ctx *ua_ctx; |
030a66fa | 490 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 491 | struct ust_registry_session *registry; |
d80a6244 | 492 | |
ffe60014 DG |
493 | assert(ua_chan); |
494 | ||
495 | DBG3("UST app deleting channel %s", ua_chan->name); | |
496 | ||
55cc08a6 | 497 | /* Wipe stream */ |
d80a6244 | 498 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 499 | cds_list_del(&stream->list); |
fb45065e | 500 | delete_ust_app_stream(sock, stream, app); |
d80a6244 DG |
501 | } |
502 | ||
55cc08a6 | 503 | /* Wipe context */ |
bec39940 | 504 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
31746f93 | 505 | cds_list_del(&ua_ctx->list); |
bec39940 | 506 | ret = lttng_ht_del(ua_chan->ctx, &iter); |
55cc08a6 | 507 | assert(!ret); |
fb45065e | 508 | delete_ust_app_ctx(sock, ua_ctx, app); |
55cc08a6 | 509 | } |
d80a6244 | 510 | |
55cc08a6 | 511 | /* Wipe events */ |
bec39940 DG |
512 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
513 | node.node) { | |
514 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 515 | assert(!ret); |
fb45065e | 516 | delete_ust_app_event(sock, ua_event, app); |
d80a6244 | 517 | } |
edb67388 | 518 | |
c8335706 MD |
519 | if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) { |
520 | /* Wipe and free registry from session registry. */ | |
521 | registry = get_session_registry(ua_chan->session); | |
522 | if (registry) { | |
e9404c27 | 523 | ust_registry_channel_del_free(registry, ua_chan->key, |
e38d96f9 MD |
524 | sock >= 0); |
525 | } | |
45798a31 JG |
526 | /* |
527 | * A negative socket can be used by the caller when | |
528 | * cleaning-up a ua_chan in an error path. Skip the | |
529 | * accounting in this case. | |
530 | */ | |
e38d96f9 MD |
531 | if (sock >= 0) { |
532 | save_per_pid_lost_discarded_counters(ua_chan); | |
c8335706 | 533 | } |
7972aab2 | 534 | } |
d0b96690 | 535 | |
edb67388 | 536 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
537 | /* Remove channel from application UST object descriptor. */ |
538 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
c6e62271 DG |
539 | ret = lttng_ht_del(app->ust_objd, &iter); |
540 | assert(!ret); | |
fb45065e | 541 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 542 | ret = ustctl_release_object(sock, ua_chan->obj); |
fb45065e | 543 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
544 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
545 | ERR("UST app sock %d release channel obj failed with ret %d", | |
546 | sock, ret); | |
547 | } | |
7972aab2 | 548 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
549 | free(ua_chan->obj); |
550 | } | |
36b588ed | 551 | call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); |
d80a6244 DG |
552 | } |
553 | ||
fb45065e MD |
554 | int ust_app_register_done(struct ust_app *app) |
555 | { | |
556 | int ret; | |
557 | ||
558 | pthread_mutex_lock(&app->sock_lock); | |
559 | ret = ustctl_register_done(app->sock); | |
560 | pthread_mutex_unlock(&app->sock_lock); | |
561 | return ret; | |
562 | } | |
563 | ||
564 | int ust_app_release_object(struct ust_app *app, struct lttng_ust_object_data *data) | |
565 | { | |
566 | int ret, sock; | |
567 | ||
568 | if (app) { | |
569 | pthread_mutex_lock(&app->sock_lock); | |
570 | sock = app->sock; | |
571 | } else { | |
572 | sock = -1; | |
573 | } | |
574 | ret = ustctl_release_object(sock, data); | |
575 | if (app) { | |
576 | pthread_mutex_unlock(&app->sock_lock); | |
577 | } | |
578 | return ret; | |
579 | } | |
580 | ||
331744e3 | 581 | /* |
1b532a60 DG |
582 | * Push metadata to consumer socket. |
583 | * | |
dc2bbdae MD |
584 | * RCU read-side lock must be held to guarantee existance of socket. |
585 | * Must be called with the ust app session lock held. | |
586 | * Must be called with the registry lock held. | |
331744e3 JD |
587 | * |
588 | * On success, return the len of metadata pushed or else a negative value. | |
2c57e06d MD |
589 | * Returning a -EPIPE return value means we could not send the metadata, |
590 | * but it can be caused by recoverable errors (e.g. the application has | |
591 | * terminated concurrently). | |
331744e3 JD |
592 | */ |
593 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
594 | struct consumer_socket *socket, int send_zero_data) | |
595 | { | |
596 | int ret; | |
597 | char *metadata_str = NULL; | |
c585821b | 598 | size_t len, offset, new_metadata_len_sent; |
331744e3 | 599 | ssize_t ret_val; |
93ec662e | 600 | uint64_t metadata_key, metadata_version; |
331744e3 JD |
601 | |
602 | assert(registry); | |
603 | assert(socket); | |
1b532a60 | 604 | |
c585821b MD |
605 | metadata_key = registry->metadata_key; |
606 | ||
ce34fcd0 | 607 | /* |
dc2bbdae MD |
608 | * Means that no metadata was assigned to the session. This can |
609 | * happens if no start has been done previously. | |
ce34fcd0 | 610 | */ |
c585821b | 611 | if (!metadata_key) { |
ce34fcd0 MD |
612 | return 0; |
613 | } | |
614 | ||
331744e3 JD |
615 | offset = registry->metadata_len_sent; |
616 | len = registry->metadata_len - registry->metadata_len_sent; | |
c585821b | 617 | new_metadata_len_sent = registry->metadata_len; |
93ec662e | 618 | metadata_version = registry->metadata_version; |
331744e3 JD |
619 | if (len == 0) { |
620 | DBG3("No metadata to push for metadata key %" PRIu64, | |
621 | registry->metadata_key); | |
622 | ret_val = len; | |
623 | if (send_zero_data) { | |
624 | DBG("No metadata to push"); | |
625 | goto push_data; | |
626 | } | |
627 | goto end; | |
628 | } | |
629 | ||
630 | /* Allocate only what we have to send. */ | |
631 | metadata_str = zmalloc(len); | |
632 | if (!metadata_str) { | |
633 | PERROR("zmalloc ust app metadata string"); | |
634 | ret_val = -ENOMEM; | |
635 | goto error; | |
636 | } | |
c585821b | 637 | /* Copy what we haven't sent out. */ |
331744e3 | 638 | memcpy(metadata_str, registry->metadata + offset, len); |
331744e3 JD |
639 | |
640 | push_data: | |
c585821b MD |
641 | pthread_mutex_unlock(®istry->lock); |
642 | /* | |
643 | * We need to unlock the registry while we push metadata to | |
644 | * break a circular dependency between the consumerd metadata | |
645 | * lock and the sessiond registry lock. Indeed, pushing metadata | |
646 | * to the consumerd awaits that it gets pushed all the way to | |
647 | * relayd, but doing so requires grabbing the metadata lock. If | |
648 | * a concurrent metadata request is being performed by | |
649 | * consumerd, this can try to grab the registry lock on the | |
650 | * sessiond while holding the metadata lock on the consumer | |
651 | * daemon. Those push and pull schemes are performed on two | |
652 | * different bidirectionnal communication sockets. | |
653 | */ | |
654 | ret = consumer_push_metadata(socket, metadata_key, | |
93ec662e | 655 | metadata_str, len, offset, metadata_version); |
c585821b | 656 | pthread_mutex_lock(®istry->lock); |
331744e3 | 657 | if (ret < 0) { |
000baf6a | 658 | /* |
dc2bbdae MD |
659 | * There is an acceptable race here between the registry |
660 | * metadata key assignment and the creation on the | |
661 | * consumer. The session daemon can concurrently push | |
662 | * metadata for this registry while being created on the | |
663 | * consumer since the metadata key of the registry is | |
664 | * assigned *before* it is setup to avoid the consumer | |
665 | * to ask for metadata that could possibly be not found | |
666 | * in the session daemon. | |
000baf6a | 667 | * |
dc2bbdae MD |
668 | * The metadata will get pushed either by the session |
669 | * being stopped or the consumer requesting metadata if | |
670 | * that race is triggered. | |
000baf6a DG |
671 | */ |
672 | if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) { | |
673 | ret = 0; | |
c585821b MD |
674 | } else { |
675 | ERR("Error pushing metadata to consumer"); | |
000baf6a | 676 | } |
331744e3 JD |
677 | ret_val = ret; |
678 | goto error_push; | |
c585821b MD |
679 | } else { |
680 | /* | |
681 | * Metadata may have been concurrently pushed, since | |
682 | * we're not holding the registry lock while pushing to | |
683 | * consumer. This is handled by the fact that we send | |
684 | * the metadata content, size, and the offset at which | |
685 | * that metadata belongs. This may arrive out of order | |
686 | * on the consumer side, and the consumer is able to | |
687 | * deal with overlapping fragments. The consumer | |
688 | * supports overlapping fragments, which must be | |
689 | * contiguous starting from offset 0. We keep the | |
690 | * largest metadata_len_sent value of the concurrent | |
691 | * send. | |
692 | */ | |
693 | registry->metadata_len_sent = | |
694 | max_t(size_t, registry->metadata_len_sent, | |
695 | new_metadata_len_sent); | |
331744e3 | 696 | } |
331744e3 JD |
697 | free(metadata_str); |
698 | return len; | |
699 | ||
700 | end: | |
701 | error: | |
ce34fcd0 MD |
702 | if (ret_val) { |
703 | /* | |
dc2bbdae MD |
704 | * On error, flag the registry that the metadata is |
705 | * closed. We were unable to push anything and this | |
706 | * means that either the consumer is not responding or | |
707 | * the metadata cache has been destroyed on the | |
708 | * consumer. | |
ce34fcd0 MD |
709 | */ |
710 | registry->metadata_closed = 1; | |
711 | } | |
331744e3 JD |
712 | error_push: |
713 | free(metadata_str); | |
714 | return ret_val; | |
715 | } | |
716 | ||
d88aee68 | 717 | /* |
ce34fcd0 | 718 | * For a given application and session, push metadata to consumer. |
331744e3 JD |
719 | * Either sock or consumer is required : if sock is NULL, the default |
720 | * socket to send the metadata is retrieved from consumer, if sock | |
721 | * is not NULL we use it to send the metadata. | |
ce34fcd0 | 722 | * RCU read-side lock must be held while calling this function, |
dc2bbdae MD |
723 | * therefore ensuring existance of registry. It also ensures existance |
724 | * of socket throughout this function. | |
d88aee68 DG |
725 | * |
726 | * Return 0 on success else a negative error. | |
2c57e06d MD |
727 | * Returning a -EPIPE return value means we could not send the metadata, |
728 | * but it can be caused by recoverable errors (e.g. the application has | |
729 | * terminated concurrently). | |
d88aee68 | 730 | */ |
7972aab2 DG |
731 | static int push_metadata(struct ust_registry_session *registry, |
732 | struct consumer_output *consumer) | |
d88aee68 | 733 | { |
331744e3 JD |
734 | int ret_val; |
735 | ssize_t ret; | |
d88aee68 DG |
736 | struct consumer_socket *socket; |
737 | ||
7972aab2 DG |
738 | assert(registry); |
739 | assert(consumer); | |
740 | ||
ce34fcd0 | 741 | pthread_mutex_lock(®istry->lock); |
ce34fcd0 | 742 | if (registry->metadata_closed) { |
dc2bbdae MD |
743 | ret_val = -EPIPE; |
744 | goto error; | |
d88aee68 DG |
745 | } |
746 | ||
d88aee68 | 747 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
748 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
749 | consumer); | |
d88aee68 | 750 | if (!socket) { |
331744e3 | 751 | ret_val = -1; |
ce34fcd0 | 752 | goto error; |
d88aee68 DG |
753 | } |
754 | ||
331744e3 | 755 | ret = ust_app_push_metadata(registry, socket, 0); |
d88aee68 | 756 | if (ret < 0) { |
331744e3 | 757 | ret_val = ret; |
ce34fcd0 | 758 | goto error; |
d88aee68 | 759 | } |
dc2bbdae | 760 | pthread_mutex_unlock(®istry->lock); |
d88aee68 DG |
761 | return 0; |
762 | ||
ce34fcd0 | 763 | error: |
dc2bbdae | 764 | pthread_mutex_unlock(®istry->lock); |
331744e3 | 765 | return ret_val; |
d88aee68 DG |
766 | } |
767 | ||
768 | /* | |
769 | * Send to the consumer a close metadata command for the given session. Once | |
770 | * done, the metadata channel is deleted and the session metadata pointer is | |
dc2bbdae | 771 | * nullified. The session lock MUST be held unless the application is |
d88aee68 DG |
772 | * in the destroy path. |
773 | * | |
a70ac2f4 MD |
774 | * Do not hold the registry lock while communicating with the consumerd, because |
775 | * doing so causes inter-process deadlocks between consumerd and sessiond with | |
776 | * the metadata request notification. | |
777 | * | |
d88aee68 DG |
778 | * Return 0 on success else a negative value. |
779 | */ | |
7972aab2 DG |
780 | static int close_metadata(struct ust_registry_session *registry, |
781 | struct consumer_output *consumer) | |
d88aee68 DG |
782 | { |
783 | int ret; | |
784 | struct consumer_socket *socket; | |
a70ac2f4 MD |
785 | uint64_t metadata_key; |
786 | bool registry_was_already_closed; | |
d88aee68 | 787 | |
7972aab2 DG |
788 | assert(registry); |
789 | assert(consumer); | |
d88aee68 | 790 | |
7972aab2 DG |
791 | rcu_read_lock(); |
792 | ||
ce34fcd0 | 793 | pthread_mutex_lock(®istry->lock); |
a70ac2f4 MD |
794 | metadata_key = registry->metadata_key; |
795 | registry_was_already_closed = registry->metadata_closed; | |
796 | if (metadata_key != 0) { | |
797 | /* | |
798 | * Metadata closed. Even on error this means that the consumer | |
799 | * is not responding or not found so either way a second close | |
800 | * should NOT be emit for this registry. | |
801 | */ | |
802 | registry->metadata_closed = 1; | |
803 | } | |
804 | pthread_mutex_unlock(®istry->lock); | |
ce34fcd0 | 805 | |
a70ac2f4 | 806 | if (metadata_key == 0 || registry_was_already_closed) { |
d88aee68 | 807 | ret = 0; |
1b532a60 | 808 | goto end; |
d88aee68 DG |
809 | } |
810 | ||
d88aee68 | 811 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
812 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
813 | consumer); | |
d88aee68 DG |
814 | if (!socket) { |
815 | ret = -1; | |
a70ac2f4 | 816 | goto end; |
d88aee68 DG |
817 | } |
818 | ||
a70ac2f4 | 819 | ret = consumer_close_metadata(socket, metadata_key); |
d88aee68 | 820 | if (ret < 0) { |
a70ac2f4 | 821 | goto end; |
d88aee68 DG |
822 | } |
823 | ||
1b532a60 | 824 | end: |
7972aab2 | 825 | rcu_read_unlock(); |
d88aee68 DG |
826 | return ret; |
827 | } | |
828 | ||
36b588ed MD |
829 | /* |
830 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
831 | * section and outside of call_rcu thread, so we postpone its execution |
832 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
833 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
834 | */ |
835 | static | |
836 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
837 | { | |
838 | struct ust_app_session *ua_sess = | |
839 | caa_container_of(head, struct ust_app_session, rcu_head); | |
840 | ||
0b2dc8df | 841 | ht_cleanup_push(ua_sess->channels); |
36b588ed MD |
842 | free(ua_sess); |
843 | } | |
844 | ||
d80a6244 DG |
845 | /* |
846 | * Delete ust app session safely. RCU read lock must be held before calling | |
847 | * this function. | |
82cac6d2 JG |
848 | * |
849 | * The session list lock must be held by the caller. | |
d80a6244 | 850 | */ |
8b366481 | 851 | static |
d0b96690 DG |
852 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
853 | struct ust_app *app) | |
d80a6244 DG |
854 | { |
855 | int ret; | |
bec39940 | 856 | struct lttng_ht_iter iter; |
d80a6244 | 857 | struct ust_app_channel *ua_chan; |
7972aab2 | 858 | struct ust_registry_session *registry; |
d80a6244 | 859 | |
d88aee68 DG |
860 | assert(ua_sess); |
861 | ||
1b532a60 DG |
862 | pthread_mutex_lock(&ua_sess->lock); |
863 | ||
b161602a MD |
864 | assert(!ua_sess->deleted); |
865 | ua_sess->deleted = true; | |
866 | ||
7972aab2 | 867 | registry = get_session_registry(ua_sess); |
fad1ed2f | 868 | /* Registry can be null on error path during initialization. */ |
ce34fcd0 | 869 | if (registry) { |
d88aee68 | 870 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 871 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 872 | |
7972aab2 DG |
873 | /* |
874 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
875 | * metadata only on destroy trace session in this case. Also, the |
876 | * previous push metadata could have flag the metadata registry to | |
877 | * close so don't send a close command if closed. | |
7972aab2 | 878 | */ |
ce34fcd0 | 879 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
880 | /* And ask to close it for this session registry. */ |
881 | (void) close_metadata(registry, ua_sess->consumer); | |
882 | } | |
d80a6244 DG |
883 | } |
884 | ||
bec39940 DG |
885 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
886 | node.node) { | |
887 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 888 | assert(!ret); |
d0b96690 | 889 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 890 | } |
d80a6244 | 891 | |
7972aab2 DG |
892 | /* In case of per PID, the registry is kept in the session. */ |
893 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
894 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
895 | if (reg_pid) { | |
fad1ed2f JR |
896 | /* |
897 | * Registry can be null on error path during | |
898 | * initialization. | |
899 | */ | |
7972aab2 DG |
900 | buffer_reg_pid_remove(reg_pid); |
901 | buffer_reg_pid_destroy(reg_pid); | |
902 | } | |
903 | } | |
d0b96690 | 904 | |
aee6bafd | 905 | if (ua_sess->handle != -1) { |
fb45065e | 906 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 907 | ret = ustctl_release_handle(sock, ua_sess->handle); |
fb45065e | 908 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
909 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
910 | ERR("UST app sock %d release session handle failed with ret %d", | |
911 | sock, ret); | |
912 | } | |
10b56aef MD |
913 | /* Remove session from application UST object descriptor. */ |
914 | iter.iter.node = &ua_sess->ust_objd_node.node; | |
915 | ret = lttng_ht_del(app->ust_sessions_objd, &iter); | |
916 | assert(!ret); | |
aee6bafd | 917 | } |
10b56aef | 918 | |
1b532a60 DG |
919 | pthread_mutex_unlock(&ua_sess->lock); |
920 | ||
6addfa37 MD |
921 | consumer_output_put(ua_sess->consumer); |
922 | ||
36b588ed | 923 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 924 | } |
91d76f53 DG |
925 | |
926 | /* | |
284d8f55 DG |
927 | * Delete a traceable application structure from the global list. Never call |
928 | * this function outside of a call_rcu call. | |
36b588ed MD |
929 | * |
930 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 931 | */ |
8b366481 DG |
932 | static |
933 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 934 | { |
8b366481 | 935 | int ret, sock; |
d42f20df | 936 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 937 | |
82cac6d2 JG |
938 | /* |
939 | * The session list lock must be held during this function to guarantee | |
940 | * the existence of ua_sess. | |
941 | */ | |
942 | session_lock_list(); | |
d80a6244 | 943 | /* Delete ust app sessions info */ |
852d0037 DG |
944 | sock = app->sock; |
945 | app->sock = -1; | |
d80a6244 | 946 | |
8b366481 | 947 | /* Wipe sessions */ |
d42f20df DG |
948 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
949 | teardown_node) { | |
950 | /* Free every object in the session and the session. */ | |
36b588ed | 951 | rcu_read_lock(); |
d0b96690 | 952 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 953 | rcu_read_unlock(); |
d80a6244 | 954 | } |
36b588ed | 955 | |
0b2dc8df | 956 | ht_cleanup_push(app->sessions); |
10b56aef | 957 | ht_cleanup_push(app->ust_sessions_objd); |
0b2dc8df | 958 | ht_cleanup_push(app->ust_objd); |
d80a6244 | 959 | |
d3a684ee JR |
960 | ustctl_release_object(sock, app->token_communication.handle); |
961 | ||
962 | lttng_pipe_close(app->token_communication.trigger_event_pipe); | |
963 | ||
6414a713 | 964 | /* |
852d0037 DG |
965 | * Wait until we have deleted the application from the sock hash table |
966 | * before closing this socket, otherwise an application could re-use the | |
967 | * socket ID and race with the teardown, using the same hash table entry. | |
968 | * | |
969 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
970 | * all RCU readers that could run concurrently with unregister app, | |
971 | * therefore we _need_ to only close that socket after a grace period. So | |
972 | * it should stay in this RCU callback. | |
973 | * | |
974 | * This close() is a very important step of the synchronization model so | |
975 | * every modification to this function must be carefully reviewed. | |
6414a713 | 976 | */ |
799e2c4f MD |
977 | ret = close(sock); |
978 | if (ret) { | |
979 | PERROR("close"); | |
980 | } | |
4063050c | 981 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 982 | |
852d0037 | 983 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 984 | free(app); |
82cac6d2 | 985 | session_unlock_list(); |
099e26bd DG |
986 | } |
987 | ||
988 | /* | |
f6a9efaa | 989 | * URCU intermediate call to delete an UST app. |
099e26bd | 990 | */ |
8b366481 DG |
991 | static |
992 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 993 | { |
bec39940 DG |
994 | struct lttng_ht_node_ulong *node = |
995 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 996 | struct ust_app *app = |
852d0037 | 997 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 998 | |
852d0037 | 999 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 1000 | delete_ust_app(app); |
099e26bd DG |
1001 | } |
1002 | ||
ffe60014 DG |
1003 | /* |
1004 | * Delete the session from the application ht and delete the data structure by | |
1005 | * freeing every object inside and releasing them. | |
82cac6d2 JG |
1006 | * |
1007 | * The session list lock must be held by the caller. | |
ffe60014 | 1008 | */ |
d0b96690 | 1009 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
1010 | struct ust_app_session *ua_sess) |
1011 | { | |
1012 | int ret; | |
1013 | struct lttng_ht_iter iter; | |
1014 | ||
1015 | assert(app); | |
1016 | assert(ua_sess); | |
1017 | ||
1018 | iter.iter.node = &ua_sess->node.node; | |
1019 | ret = lttng_ht_del(app->sessions, &iter); | |
1020 | if (ret) { | |
1021 | /* Already scheduled for teardown. */ | |
1022 | goto end; | |
1023 | } | |
1024 | ||
1025 | /* Once deleted, free the data structure. */ | |
d0b96690 | 1026 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
1027 | |
1028 | end: | |
1029 | return; | |
1030 | } | |
1031 | ||
8b366481 DG |
1032 | /* |
1033 | * Alloc new UST app session. | |
1034 | */ | |
1035 | static | |
40bbd087 | 1036 | struct ust_app_session *alloc_ust_app_session(void) |
8b366481 DG |
1037 | { |
1038 | struct ust_app_session *ua_sess; | |
1039 | ||
1040 | /* Init most of the default value by allocating and zeroing */ | |
1041 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
1042 | if (ua_sess == NULL) { | |
1043 | PERROR("malloc"); | |
ffe60014 | 1044 | goto error_free; |
8b366481 DG |
1045 | } |
1046 | ||
1047 | ua_sess->handle = -1; | |
bec39940 | 1048 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
ad7a9107 | 1049 | ua_sess->metadata_attr.type = LTTNG_UST_CHAN_METADATA; |
84ad93e8 | 1050 | pthread_mutex_init(&ua_sess->lock, NULL); |
ad7a9107 | 1051 | |
8b366481 DG |
1052 | return ua_sess; |
1053 | ||
ffe60014 | 1054 | error_free: |
8b366481 DG |
1055 | return NULL; |
1056 | } | |
1057 | ||
1058 | /* | |
1059 | * Alloc new UST app channel. | |
1060 | */ | |
1061 | static | |
d3a684ee | 1062 | struct ust_app_channel *alloc_ust_app_channel(const char *name, |
d0b96690 | 1063 | struct ust_app_session *ua_sess, |
ffe60014 | 1064 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
1065 | { |
1066 | struct ust_app_channel *ua_chan; | |
1067 | ||
1068 | /* Init most of the default value by allocating and zeroing */ | |
1069 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
1070 | if (ua_chan == NULL) { | |
1071 | PERROR("malloc"); | |
1072 | goto error; | |
1073 | } | |
1074 | ||
1075 | /* Setup channel name */ | |
1076 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
1077 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
1078 | ||
1079 | ua_chan->enabled = 1; | |
1080 | ua_chan->handle = -1; | |
45893984 | 1081 | ua_chan->session = ua_sess; |
ffe60014 | 1082 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
1083 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
1084 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
1085 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
1086 | |
1087 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
31746f93 | 1088 | CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); |
8b366481 DG |
1089 | |
1090 | /* Copy attributes */ | |
1091 | if (attr) { | |
ffe60014 | 1092 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
1093 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
1094 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
1095 | ua_chan->attr.overwrite = attr->overwrite; | |
1096 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
1097 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
1098 | ua_chan->attr.output = attr->output; | |
491d1539 | 1099 | ua_chan->attr.blocking_timeout = attr->u.s.blocking_timeout; |
8b366481 | 1100 | } |
ffe60014 DG |
1101 | /* By default, the channel is a per cpu channel. */ |
1102 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
1103 | |
1104 | DBG3("UST app channel %s allocated", ua_chan->name); | |
1105 | ||
1106 | return ua_chan; | |
1107 | ||
1108 | error: | |
1109 | return NULL; | |
1110 | } | |
1111 | ||
37f1c236 DG |
1112 | /* |
1113 | * Allocate and initialize a UST app stream. | |
1114 | * | |
1115 | * Return newly allocated stream pointer or NULL on error. | |
1116 | */ | |
ffe60014 | 1117 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
1118 | { |
1119 | struct ust_app_stream *stream = NULL; | |
1120 | ||
1121 | stream = zmalloc(sizeof(*stream)); | |
1122 | if (stream == NULL) { | |
1123 | PERROR("zmalloc ust app stream"); | |
1124 | goto error; | |
1125 | } | |
1126 | ||
1127 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
1128 | stream->handle = -1; | |
1129 | ||
1130 | error: | |
1131 | return stream; | |
1132 | } | |
1133 | ||
8b366481 DG |
1134 | /* |
1135 | * Alloc new UST app event. | |
1136 | */ | |
1137 | static | |
1138 | struct ust_app_event *alloc_ust_app_event(char *name, | |
1139 | struct lttng_ust_event *attr) | |
1140 | { | |
1141 | struct ust_app_event *ua_event; | |
1142 | ||
1143 | /* Init most of the default value by allocating and zeroing */ | |
1144 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
1145 | if (ua_event == NULL) { | |
20533947 | 1146 | PERROR("Failed to allocate ust_app_event structure"); |
8b366481 DG |
1147 | goto error; |
1148 | } | |
1149 | ||
1150 | ua_event->enabled = 1; | |
1151 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
1152 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 1153 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
1154 | |
1155 | /* Copy attributes */ | |
1156 | if (attr) { | |
1157 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
1158 | } | |
1159 | ||
1160 | DBG3("UST app event %s allocated", ua_event->name); | |
1161 | ||
1162 | return ua_event; | |
1163 | ||
1164 | error: | |
1165 | return NULL; | |
1166 | } | |
1167 | ||
d3a684ee JR |
1168 | /* |
1169 | * Alloc new UST app token event rule. | |
1170 | */ | |
1171 | static struct ust_app_token_event_rule *alloc_ust_app_token_event_rule( | |
1172 | struct lttng_event_rule *event_rule, uint64_t token) | |
1173 | { | |
1174 | struct ust_app_token_event_rule *ua_token; | |
1175 | ||
1176 | ua_token = zmalloc(sizeof(struct ust_app_token_event_rule)); | |
1177 | if (ua_token == NULL) { | |
1178 | PERROR("Failed to allocate ust_app_token_event_rule structure"); | |
1179 | goto error; | |
1180 | } | |
1181 | ||
1182 | ua_token->enabled = 1; | |
1183 | ua_token->token = token; | |
1184 | lttng_ht_node_init_u64(&ua_token->node, token); | |
1185 | ||
1186 | /* Get reference of the event_rule */ | |
1187 | if (!lttng_event_rule_get(event_rule)) { | |
1188 | assert(0); | |
1189 | } | |
1190 | ||
1191 | ua_token->event_rule = event_rule; | |
1192 | ua_token->filter = lttng_event_rule_get_filter_bytecode(event_rule); | |
1193 | ua_token->exclusion = lttng_event_rule_generate_exclusions(event_rule); | |
1194 | ||
1195 | DBG3("UST app token event rule %" PRIu64 " allocated", ua_token->token); | |
1196 | ||
1197 | return ua_token; | |
1198 | ||
1199 | error: | |
1200 | return NULL; | |
1201 | } | |
1202 | ||
8b366481 DG |
1203 | /* |
1204 | * Alloc new UST app context. | |
1205 | */ | |
1206 | static | |
bdf64013 | 1207 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context_attr *uctx) |
8b366481 DG |
1208 | { |
1209 | struct ust_app_ctx *ua_ctx; | |
1210 | ||
1211 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
1212 | if (ua_ctx == NULL) { | |
1213 | goto error; | |
1214 | } | |
1215 | ||
31746f93 DG |
1216 | CDS_INIT_LIST_HEAD(&ua_ctx->list); |
1217 | ||
8b366481 DG |
1218 | if (uctx) { |
1219 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
bdf64013 JG |
1220 | if (uctx->ctx == LTTNG_UST_CONTEXT_APP_CONTEXT) { |
1221 | char *provider_name = NULL, *ctx_name = NULL; | |
1222 | ||
1223 | provider_name = strdup(uctx->u.app_ctx.provider_name); | |
1224 | ctx_name = strdup(uctx->u.app_ctx.ctx_name); | |
1225 | if (!provider_name || !ctx_name) { | |
1226 | free(provider_name); | |
1227 | free(ctx_name); | |
1228 | goto error; | |
1229 | } | |
1230 | ||
1231 | ua_ctx->ctx.u.app_ctx.provider_name = provider_name; | |
1232 | ua_ctx->ctx.u.app_ctx.ctx_name = ctx_name; | |
1233 | } | |
8b366481 DG |
1234 | } |
1235 | ||
1236 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
8b366481 | 1237 | return ua_ctx; |
bdf64013 JG |
1238 | error: |
1239 | free(ua_ctx); | |
1240 | return NULL; | |
8b366481 DG |
1241 | } |
1242 | ||
51755dc8 JG |
1243 | /* |
1244 | * Create a liblttng-ust filter bytecode from given bytecode. | |
1245 | * | |
1246 | * Return allocated filter or NULL on error. | |
1247 | */ | |
1248 | static struct lttng_ust_filter_bytecode *create_ust_bytecode_from_bytecode( | |
d3a684ee | 1249 | const struct lttng_filter_bytecode *orig_f) |
51755dc8 JG |
1250 | { |
1251 | struct lttng_ust_filter_bytecode *filter = NULL; | |
1252 | ||
1253 | /* Copy filter bytecode */ | |
1254 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
1255 | if (!filter) { | |
1256 | PERROR("zmalloc alloc ust filter bytecode"); | |
1257 | goto error; | |
1258 | } | |
1259 | ||
1260 | assert(sizeof(struct lttng_filter_bytecode) == | |
1261 | sizeof(struct lttng_ust_filter_bytecode)); | |
1262 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
1263 | error: | |
1264 | return filter; | |
1265 | } | |
1266 | ||
099e26bd | 1267 | /* |
421cb601 DG |
1268 | * Find an ust_app using the sock and return it. RCU read side lock must be |
1269 | * held before calling this helper function. | |
099e26bd | 1270 | */ |
f20baf8e | 1271 | struct ust_app *ust_app_find_by_sock(int sock) |
099e26bd | 1272 | { |
bec39940 | 1273 | struct lttng_ht_node_ulong *node; |
bec39940 | 1274 | struct lttng_ht_iter iter; |
f6a9efaa | 1275 | |
852d0037 | 1276 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 1277 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
1278 | if (node == NULL) { |
1279 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
1280 | goto error; |
1281 | } | |
852d0037 DG |
1282 | |
1283 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
1284 | |
1285 | error: | |
1286 | return NULL; | |
099e26bd DG |
1287 | } |
1288 | ||
d0b96690 DG |
1289 | /* |
1290 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
1291 | * be held before calling this helper function. | |
1292 | */ | |
1293 | static struct ust_app *find_app_by_notify_sock(int sock) | |
1294 | { | |
1295 | struct lttng_ht_node_ulong *node; | |
1296 | struct lttng_ht_iter iter; | |
1297 | ||
1298 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
1299 | &iter); | |
1300 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1301 | if (node == NULL) { | |
1302 | DBG2("UST app find by notify sock %d not found", sock); | |
1303 | goto error; | |
1304 | } | |
1305 | ||
1306 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
1307 | ||
1308 | error: | |
1309 | return NULL; | |
1310 | } | |
1311 | ||
025faf73 DG |
1312 | /* |
1313 | * Lookup for an ust app event based on event name, filter bytecode and the | |
1314 | * event loglevel. | |
1315 | * | |
1316 | * Return an ust_app_event object or NULL on error. | |
1317 | */ | |
18eace3b | 1318 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
88e3c2f5 | 1319 | const char *name, const struct lttng_filter_bytecode *filter, |
2106efa0 | 1320 | int loglevel_value, |
39c5a3a7 | 1321 | const struct lttng_event_exclusion *exclusion) |
18eace3b DG |
1322 | { |
1323 | struct lttng_ht_iter iter; | |
1324 | struct lttng_ht_node_str *node; | |
1325 | struct ust_app_event *event = NULL; | |
1326 | struct ust_app_ht_key key; | |
18eace3b DG |
1327 | |
1328 | assert(name); | |
1329 | assert(ht); | |
1330 | ||
1331 | /* Setup key for event lookup. */ | |
1332 | key.name = name; | |
1333 | key.filter = filter; | |
2106efa0 | 1334 | key.loglevel_type = loglevel_value; |
39c5a3a7 | 1335 | /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */ |
51755dc8 | 1336 | key.exclusion = exclusion; |
18eace3b | 1337 | |
025faf73 DG |
1338 | /* Lookup using the event name as hash and a custom match fct. */ |
1339 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1340 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1341 | node = lttng_ht_iter_get_node_str(&iter); |
1342 | if (node == NULL) { | |
1343 | goto end; | |
1344 | } | |
1345 | ||
1346 | event = caa_container_of(node, struct ust_app_event, node); | |
1347 | ||
1348 | end: | |
18eace3b DG |
1349 | return event; |
1350 | } | |
1351 | ||
d3a684ee JR |
1352 | /* |
1353 | * Lookup for an ust app tokens based on a token id. | |
1354 | * | |
1355 | * Return an ust_app_token_event_rule object or NULL on error. | |
1356 | */ | |
1357 | static struct ust_app_token_event_rule *find_ust_app_token_event_rule(struct lttng_ht *ht, | |
1358 | uint64_t token) | |
1359 | { | |
1360 | struct lttng_ht_iter iter; | |
1361 | struct lttng_ht_node_u64 *node; | |
1362 | struct ust_app_token_event_rule *token_event_rule = NULL; | |
1363 | ||
1364 | assert(ht); | |
1365 | ||
1366 | lttng_ht_lookup(ht, &token, &iter); | |
1367 | node = lttng_ht_iter_get_node_u64(&iter); | |
1368 | if (node == NULL) { | |
1369 | DBG2("UST app token %" PRIu64 " not found", token); | |
1370 | goto end; | |
1371 | } | |
1372 | ||
1373 | token_event_rule = caa_container_of(node, struct ust_app_token_event_rule, node); | |
1374 | end: | |
1375 | return token_event_rule; | |
1376 | } | |
1377 | ||
55cc08a6 DG |
1378 | /* |
1379 | * Create the channel context on the tracer. | |
d0b96690 DG |
1380 | * |
1381 | * Called with UST app session lock held. | |
55cc08a6 DG |
1382 | */ |
1383 | static | |
1384 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1385 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1386 | { | |
1387 | int ret; | |
1388 | ||
840cb59c | 1389 | health_code_update(); |
86acf0da | 1390 | |
fb45065e | 1391 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1392 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 | 1393 | ua_chan->obj, &ua_ctx->obj); |
fb45065e | 1394 | pthread_mutex_unlock(&app->sock_lock); |
55cc08a6 | 1395 | if (ret < 0) { |
ffe60014 DG |
1396 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1397 | ERR("UST app create channel context failed for app (pid: %d) " | |
1398 | "with ret %d", app->pid, ret); | |
1399 | } else { | |
3757b385 DG |
1400 | /* |
1401 | * This is normal behavior, an application can die during the | |
1402 | * creation process. Don't report an error so the execution can | |
1403 | * continue normally. | |
1404 | */ | |
1405 | ret = 0; | |
88e3c2f5 | 1406 | DBG3("UST app add context failed. Application is dead."); |
ffe60014 | 1407 | } |
55cc08a6 DG |
1408 | goto error; |
1409 | } | |
1410 | ||
1411 | ua_ctx->handle = ua_ctx->obj->handle; | |
1412 | ||
d0b96690 DG |
1413 | DBG2("UST app context handle %d created successfully for channel %s", |
1414 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1415 | |
1416 | error: | |
840cb59c | 1417 | health_code_update(); |
55cc08a6 DG |
1418 | return ret; |
1419 | } | |
1420 | ||
53a80697 MD |
1421 | /* |
1422 | * Set the filter on the tracer. | |
1423 | */ | |
d3a684ee JR |
1424 | static int set_ust_filter(struct ust_app *app, |
1425 | const struct lttng_filter_bytecode *bytecode, | |
1426 | struct lttng_ust_object_data *ust_object) | |
53a80697 MD |
1427 | { |
1428 | int ret; | |
51755dc8 | 1429 | struct lttng_ust_filter_bytecode *ust_bytecode = NULL; |
53a80697 | 1430 | |
840cb59c | 1431 | health_code_update(); |
86acf0da | 1432 | |
d3a684ee | 1433 | ust_bytecode = create_ust_bytecode_from_bytecode(bytecode); |
51755dc8 JG |
1434 | if (!ust_bytecode) { |
1435 | ret = -LTTNG_ERR_NOMEM; | |
1436 | goto error; | |
1437 | } | |
fb45065e | 1438 | pthread_mutex_lock(&app->sock_lock); |
51755dc8 | 1439 | ret = ustctl_set_filter(app->sock, ust_bytecode, |
d3a684ee | 1440 | ust_object); |
fb45065e | 1441 | pthread_mutex_unlock(&app->sock_lock); |
53a80697 | 1442 | if (ret < 0) { |
ffe60014 | 1443 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
d3a684ee JR |
1444 | ERR("UST app set filter failed for object %p of app (pid: %d) " |
1445 | "with ret %d", ust_object, app->pid, ret); | |
ffe60014 | 1446 | } else { |
3757b385 DG |
1447 | /* |
1448 | * This is normal behavior, an application can die during the | |
1449 | * creation process. Don't report an error so the execution can | |
1450 | * continue normally. | |
1451 | */ | |
1452 | ret = 0; | |
d3a684ee | 1453 | DBG3("UST app set filter. Application is dead."); |
ffe60014 | 1454 | } |
53a80697 MD |
1455 | goto error; |
1456 | } | |
1457 | ||
d3a684ee | 1458 | DBG2("UST filter set for object %p successfully", ust_object); |
53a80697 MD |
1459 | |
1460 | error: | |
840cb59c | 1461 | health_code_update(); |
51755dc8 | 1462 | free(ust_bytecode); |
53a80697 MD |
1463 | return ret; |
1464 | } | |
1465 | ||
51755dc8 JG |
1466 | static |
1467 | struct lttng_ust_event_exclusion *create_ust_exclusion_from_exclusion( | |
1468 | struct lttng_event_exclusion *exclusion) | |
1469 | { | |
1470 | struct lttng_ust_event_exclusion *ust_exclusion = NULL; | |
1471 | size_t exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) + | |
1472 | LTTNG_UST_SYM_NAME_LEN * exclusion->count; | |
1473 | ||
1474 | ust_exclusion = zmalloc(exclusion_alloc_size); | |
1475 | if (!ust_exclusion) { | |
1476 | PERROR("malloc"); | |
1477 | goto end; | |
1478 | } | |
1479 | ||
1480 | assert(sizeof(struct lttng_event_exclusion) == | |
1481 | sizeof(struct lttng_ust_event_exclusion)); | |
1482 | memcpy(ust_exclusion, exclusion, exclusion_alloc_size); | |
1483 | end: | |
1484 | return ust_exclusion; | |
1485 | } | |
1486 | ||
7cc9a73c JI |
1487 | /* |
1488 | * Set event exclusions on the tracer. | |
1489 | */ | |
d3a684ee JR |
1490 | static int set_ust_exclusions(struct ust_app *app, |
1491 | struct lttng_event_exclusion *exclusions, | |
1492 | struct lttng_ust_object_data *ust_object) | |
7cc9a73c JI |
1493 | { |
1494 | int ret; | |
d3a684ee | 1495 | struct lttng_ust_event_exclusion *ust_exclusions = NULL; |
7cc9a73c | 1496 | |
d3a684ee | 1497 | assert(exclusions && exclusions->count > 0); |
7cc9a73c | 1498 | |
d3a684ee | 1499 | health_code_update(); |
7cc9a73c | 1500 | |
d3a684ee JR |
1501 | ust_exclusions = create_ust_exclusion_from_exclusion( |
1502 | exclusions); | |
1503 | if (!ust_exclusions) { | |
51755dc8 JG |
1504 | ret = -LTTNG_ERR_NOMEM; |
1505 | goto error; | |
1506 | } | |
fb45065e | 1507 | pthread_mutex_lock(&app->sock_lock); |
d3a684ee | 1508 | ret = ustctl_set_exclusion(app->sock, ust_exclusions, ust_object); |
fb45065e | 1509 | pthread_mutex_unlock(&app->sock_lock); |
7cc9a73c JI |
1510 | if (ret < 0) { |
1511 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
d3a684ee JR |
1512 | ERR("UST app exclusions failed for object %p of app (pid: %d) " |
1513 | "with ret %d", ust_object, app->pid, ret); | |
7cc9a73c JI |
1514 | } else { |
1515 | /* | |
1516 | * This is normal behavior, an application can die during the | |
1517 | * creation process. Don't report an error so the execution can | |
1518 | * continue normally. | |
1519 | */ | |
1520 | ret = 0; | |
d3a684ee | 1521 | DBG3("UST app set exclusions failed. Application is dead."); |
7cc9a73c JI |
1522 | } |
1523 | goto error; | |
1524 | } | |
1525 | ||
d3a684ee | 1526 | DBG2("UST exclusions set successfully for object %p", ust_object); |
7cc9a73c JI |
1527 | |
1528 | error: | |
1529 | health_code_update(); | |
d3a684ee | 1530 | free(ust_exclusions); |
7cc9a73c JI |
1531 | return ret; |
1532 | } | |
1533 | ||
9730260e DG |
1534 | /* |
1535 | * Disable the specified event on to UST tracer for the UST session. | |
1536 | */ | |
d3a684ee JR |
1537 | static int disable_ust_object(struct ust_app *app, |
1538 | struct lttng_ust_object_data *object) | |
9730260e DG |
1539 | { |
1540 | int ret; | |
1541 | ||
840cb59c | 1542 | health_code_update(); |
86acf0da | 1543 | |
fb45065e | 1544 | pthread_mutex_lock(&app->sock_lock); |
d3a684ee | 1545 | ret = ustctl_disable(app->sock, object); |
fb45065e | 1546 | pthread_mutex_unlock(&app->sock_lock); |
9730260e | 1547 | if (ret < 0) { |
ffe60014 | 1548 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
d3a684ee JR |
1549 | ERR("UST app disable failed for object %p app (pid: %d) with ret %d", |
1550 | object, app->pid, ret); | |
ffe60014 | 1551 | } else { |
3757b385 DG |
1552 | /* |
1553 | * This is normal behavior, an application can die during the | |
1554 | * creation process. Don't report an error so the execution can | |
1555 | * continue normally. | |
1556 | */ | |
1557 | ret = 0; | |
ffe60014 DG |
1558 | DBG3("UST app disable event failed. Application is dead."); |
1559 | } | |
9730260e DG |
1560 | goto error; |
1561 | } | |
1562 | ||
d3a684ee JR |
1563 | DBG2("UST app object %p disabled successfully for app (pid: %d)", |
1564 | object, app->pid); | |
9730260e DG |
1565 | |
1566 | error: | |
840cb59c | 1567 | health_code_update(); |
9730260e DG |
1568 | return ret; |
1569 | } | |
1570 | ||
78f0bacd DG |
1571 | /* |
1572 | * Disable the specified channel on to UST tracer for the UST session. | |
1573 | */ | |
1574 | static int disable_ust_channel(struct ust_app *app, | |
1575 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1576 | { | |
1577 | int ret; | |
1578 | ||
840cb59c | 1579 | health_code_update(); |
86acf0da | 1580 | |
fb45065e | 1581 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1582 | ret = ustctl_disable(app->sock, ua_chan->obj); |
fb45065e | 1583 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1584 | if (ret < 0) { |
ffe60014 DG |
1585 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1586 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1587 | "and session handle %d with ret %d", | |
1588 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1589 | } else { | |
3757b385 DG |
1590 | /* |
1591 | * This is normal behavior, an application can die during the | |
1592 | * creation process. Don't report an error so the execution can | |
1593 | * continue normally. | |
1594 | */ | |
1595 | ret = 0; | |
ffe60014 DG |
1596 | DBG3("UST app disable channel failed. Application is dead."); |
1597 | } | |
78f0bacd DG |
1598 | goto error; |
1599 | } | |
1600 | ||
78f0bacd | 1601 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1602 | ua_chan->name, app->pid); |
78f0bacd DG |
1603 | |
1604 | error: | |
840cb59c | 1605 | health_code_update(); |
78f0bacd DG |
1606 | return ret; |
1607 | } | |
1608 | ||
1609 | /* | |
1610 | * Enable the specified channel on to UST tracer for the UST session. | |
1611 | */ | |
1612 | static int enable_ust_channel(struct ust_app *app, | |
1613 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1614 | { | |
1615 | int ret; | |
1616 | ||
840cb59c | 1617 | health_code_update(); |
86acf0da | 1618 | |
fb45065e | 1619 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1620 | ret = ustctl_enable(app->sock, ua_chan->obj); |
fb45065e | 1621 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1622 | if (ret < 0) { |
ffe60014 DG |
1623 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1624 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1625 | "and session handle %d with ret %d", | |
1626 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1627 | } else { | |
3757b385 DG |
1628 | /* |
1629 | * This is normal behavior, an application can die during the | |
1630 | * creation process. Don't report an error so the execution can | |
1631 | * continue normally. | |
1632 | */ | |
1633 | ret = 0; | |
ffe60014 DG |
1634 | DBG3("UST app enable channel failed. Application is dead."); |
1635 | } | |
78f0bacd DG |
1636 | goto error; |
1637 | } | |
1638 | ||
1639 | ua_chan->enabled = 1; | |
1640 | ||
1641 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1642 | ua_chan->name, app->pid); |
78f0bacd DG |
1643 | |
1644 | error: | |
840cb59c | 1645 | health_code_update(); |
78f0bacd DG |
1646 | return ret; |
1647 | } | |
1648 | ||
edb67388 DG |
1649 | /* |
1650 | * Enable the specified event on to UST tracer for the UST session. | |
1651 | */ | |
d3a684ee | 1652 | static int enable_ust_object(struct ust_app *app, struct lttng_ust_object_data *ust_object) |
edb67388 DG |
1653 | { |
1654 | int ret; | |
1655 | ||
840cb59c | 1656 | health_code_update(); |
86acf0da | 1657 | |
fb45065e | 1658 | pthread_mutex_lock(&app->sock_lock); |
d3a684ee | 1659 | ret = ustctl_enable(app->sock, ust_object); |
fb45065e | 1660 | pthread_mutex_unlock(&app->sock_lock); |
edb67388 | 1661 | if (ret < 0) { |
ffe60014 | 1662 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
d3a684ee JR |
1663 | ERR("UST app enable failed for object %p app (pid: %d) with ret %d", |
1664 | ust_object, app->pid, ret); | |
ffe60014 | 1665 | } else { |
3757b385 DG |
1666 | /* |
1667 | * This is normal behavior, an application can die during the | |
1668 | * creation process. Don't report an error so the execution can | |
1669 | * continue normally. | |
1670 | */ | |
1671 | ret = 0; | |
d3a684ee | 1672 | DBG3("UST app enable failed. Application is dead."); |
ffe60014 | 1673 | } |
edb67388 DG |
1674 | goto error; |
1675 | } | |
1676 | ||
d3a684ee JR |
1677 | DBG2("UST app object %p enabled successfully for app (pid: %d)", |
1678 | ust_object, app->pid); | |
edb67388 DG |
1679 | |
1680 | error: | |
840cb59c | 1681 | health_code_update(); |
edb67388 DG |
1682 | return ret; |
1683 | } | |
1684 | ||
099e26bd | 1685 | /* |
7972aab2 | 1686 | * Send channel and stream buffer to application. |
4f3ab6ee | 1687 | * |
ffe60014 | 1688 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1689 | */ |
7972aab2 DG |
1690 | static int send_channel_pid_to_ust(struct ust_app *app, |
1691 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1692 | { |
1693 | int ret; | |
ffe60014 | 1694 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1695 | |
1696 | assert(app); | |
ffe60014 | 1697 | assert(ua_sess); |
4f3ab6ee | 1698 | assert(ua_chan); |
4f3ab6ee | 1699 | |
840cb59c | 1700 | health_code_update(); |
4f3ab6ee | 1701 | |
7972aab2 DG |
1702 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1703 | app->sock); | |
86acf0da | 1704 | |
ffe60014 DG |
1705 | /* Send channel to the application. */ |
1706 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
1707 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1708 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1709 | goto error; | |
1710 | } else if (ret < 0) { | |
b551a063 DG |
1711 | goto error; |
1712 | } | |
1713 | ||
d88aee68 DG |
1714 | health_code_update(); |
1715 | ||
ffe60014 DG |
1716 | /* Send all streams to application. */ |
1717 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1718 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
a7169585 MD |
1719 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1720 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1721 | goto error; | |
1722 | } else if (ret < 0) { | |
ffe60014 DG |
1723 | goto error; |
1724 | } | |
1725 | /* We don't need the stream anymore once sent to the tracer. */ | |
1726 | cds_list_del(&stream->list); | |
fb45065e | 1727 | delete_ust_app_stream(-1, stream, app); |
ffe60014 | 1728 | } |
ffe60014 DG |
1729 | /* Flag the channel that it is sent to the application. */ |
1730 | ua_chan->is_sent = 1; | |
ffe60014 | 1731 | |
b551a063 | 1732 | error: |
840cb59c | 1733 | health_code_update(); |
b551a063 DG |
1734 | return ret; |
1735 | } | |
1736 | ||
91d76f53 | 1737 | /* |
5b4a0ec0 | 1738 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1739 | * |
1740 | * Should be called with session mutex held. | |
91d76f53 | 1741 | */ |
edb67388 DG |
1742 | static |
1743 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1744 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1745 | { |
5b4a0ec0 | 1746 | int ret = 0; |
284d8f55 | 1747 | |
840cb59c | 1748 | health_code_update(); |
86acf0da | 1749 | |
5b4a0ec0 | 1750 | /* Create UST event on tracer */ |
fb45065e | 1751 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1752 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 | 1753 | &ua_event->obj); |
fb45065e | 1754 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 | 1755 | if (ret < 0) { |
ffe60014 | 1756 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
88e3c2f5 | 1757 | abort(); |
ffe60014 DG |
1758 | ERR("Error ustctl create event %s for app pid: %d with ret %d", |
1759 | ua_event->attr.name, app->pid, ret); | |
1760 | } else { | |
3757b385 DG |
1761 | /* |
1762 | * This is normal behavior, an application can die during the | |
1763 | * creation process. Don't report an error so the execution can | |
1764 | * continue normally. | |
1765 | */ | |
1766 | ret = 0; | |
ffe60014 DG |
1767 | DBG3("UST app create event failed. Application is dead."); |
1768 | } | |
5b4a0ec0 | 1769 | goto error; |
91d76f53 | 1770 | } |
f6a9efaa | 1771 | |
5b4a0ec0 | 1772 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1773 | |
d3a684ee JR |
1774 | DBG2("UST app event %s created successfully for pid:%d object: %p", |
1775 | ua_event->attr.name, app->pid, ua_event->obj); | |
f6a9efaa | 1776 | |
840cb59c | 1777 | health_code_update(); |
86acf0da | 1778 | |
025faf73 DG |
1779 | /* Set filter if one is present. */ |
1780 | if (ua_event->filter) { | |
d3a684ee | 1781 | ret = set_ust_filter(app, ua_event->filter, ua_event->obj); |
025faf73 DG |
1782 | if (ret < 0) { |
1783 | goto error; | |
1784 | } | |
1785 | } | |
1786 | ||
7cc9a73c JI |
1787 | /* Set exclusions for the event */ |
1788 | if (ua_event->exclusion) { | |
d3a684ee | 1789 | ret = set_ust_exclusions(app, ua_event->exclusion, ua_event->obj); |
7cc9a73c JI |
1790 | if (ret < 0) { |
1791 | goto error; | |
1792 | } | |
1793 | } | |
1794 | ||
8535a6d9 | 1795 | /* If event not enabled, disable it on the tracer */ |
40113787 MD |
1796 | if (ua_event->enabled) { |
1797 | /* | |
1798 | * We now need to explicitly enable the event, since it | |
1799 | * is now disabled at creation. | |
1800 | */ | |
d3a684ee | 1801 | ret = enable_ust_object(app, ua_event->obj); |
40113787 MD |
1802 | if (ret < 0) { |
1803 | /* | |
1804 | * If we hit an EPERM, something is wrong with our enable call. If | |
1805 | * we get an EEXIST, there is a problem on the tracer side since we | |
1806 | * just created it. | |
1807 | */ | |
1808 | switch (ret) { | |
1809 | case -LTTNG_UST_ERR_PERM: | |
1810 | /* Code flow problem */ | |
1811 | assert(0); | |
1812 | case -LTTNG_UST_ERR_EXIST: | |
1813 | /* It's OK for our use case. */ | |
1814 | ret = 0; | |
1815 | break; | |
1816 | default: | |
1817 | break; | |
1818 | } | |
1819 | goto error; | |
1820 | } | |
8535a6d9 DG |
1821 | } |
1822 | ||
5b4a0ec0 | 1823 | error: |
840cb59c | 1824 | health_code_update(); |
5b4a0ec0 | 1825 | return ret; |
91d76f53 | 1826 | } |
48842b30 | 1827 | |
d3a684ee JR |
1828 | static |
1829 | void init_ust_trigger_from_event_rule(const struct lttng_event_rule *rule, struct lttng_ust_trigger *trigger) | |
1830 | { | |
1831 | enum lttng_event_rule_status status; | |
1832 | enum lttng_loglevel_type loglevel_type; | |
1833 | enum lttng_ust_loglevel_type ust_loglevel_type = LTTNG_UST_LOGLEVEL_ALL; | |
1834 | int loglevel = -1; | |
1835 | const char *pattern; | |
1836 | ||
1837 | /* For now only LTTNG_EVENT_RULE_TYPE_TRACEPOINT are supported */ | |
1838 | assert(lttng_event_rule_get_type(rule) == LTTNG_EVENT_RULE_TYPE_TRACEPOINT); | |
1839 | ||
1840 | memset(trigger, 0, sizeof(*trigger)); | |
1841 | ||
1842 | if (lttng_event_rule_is_agent(rule)) { | |
1843 | /* | |
1844 | * Special event for agents | |
1845 | * The actual meat of the event is in the filter that will be | |
1846 | * attached later on. | |
1847 | * Set the default values for the agent event. | |
1848 | */ | |
1849 | pattern = event_get_default_agent_ust_name(lttng_event_rule_get_domain_type(rule)); | |
1850 | loglevel = 0; | |
1851 | ust_loglevel_type = LTTNG_UST_LOGLEVEL_ALL; | |
1852 | } else { | |
1853 | status = lttng_event_rule_tracepoint_get_pattern(rule, &pattern); | |
1854 | if (status != LTTNG_EVENT_RULE_STATUS_OK) { | |
1855 | /* At this point this is a fatal error */ | |
1856 | assert(0); | |
1857 | } | |
1858 | ||
1859 | status = lttng_event_rule_tracepoint_get_loglevel_type( | |
1860 | rule, &loglevel_type); | |
1861 | if (status != LTTNG_EVENT_RULE_STATUS_OK) { | |
1862 | /* At this point this is a fatal error */ | |
1863 | assert(0); | |
1864 | } | |
1865 | ||
1866 | switch (loglevel_type) { | |
1867 | case LTTNG_EVENT_LOGLEVEL_ALL: | |
1868 | ust_loglevel_type = LTTNG_UST_LOGLEVEL_ALL; | |
1869 | break; | |
1870 | case LTTNG_EVENT_LOGLEVEL_RANGE: | |
1871 | ust_loglevel_type = LTTNG_UST_LOGLEVEL_RANGE; | |
1872 | break; | |
1873 | case LTTNG_EVENT_LOGLEVEL_SINGLE: | |
1874 | ust_loglevel_type = LTTNG_UST_LOGLEVEL_SINGLE; | |
1875 | break; | |
1876 | } | |
1877 | ||
1878 | if (loglevel_type != LTTNG_EVENT_LOGLEVEL_ALL) { | |
1879 | status = lttng_event_rule_tracepoint_get_loglevel( | |
1880 | rule, &loglevel); | |
1881 | assert(status == LTTNG_EVENT_RULE_STATUS_OK); | |
1882 | } | |
1883 | } | |
1884 | ||
1885 | trigger->instrumentation = LTTNG_UST_TRACEPOINT; | |
1886 | strncpy(trigger->name, pattern, LTTNG_UST_SYM_NAME_LEN - 1); | |
1887 | trigger->loglevel_type = ust_loglevel_type; | |
1888 | trigger->loglevel = loglevel; | |
1889 | } | |
1890 | ||
1891 | /* | |
1892 | * Create the specified event rule token onto the UST tracer for a UST app. | |
1893 | * | |
1894 | */ | |
1895 | static | |
1896 | int create_ust_token_event_rule(struct ust_app *app, struct ust_app_token_event_rule *ua_token) | |
1897 | { | |
1898 | int ret = 0; | |
1899 | struct lttng_ust_trigger trigger; | |
1900 | ||
1901 | health_code_update(); | |
1902 | ||
1903 | init_ust_trigger_from_event_rule(ua_token->event_rule, &trigger); | |
1904 | trigger.id = ua_token->token; | |
1905 | ||
1906 | /* Create UST trigger on tracer */ | |
1907 | pthread_mutex_lock(&app->sock_lock); | |
1908 | ret = ustctl_create_trigger(app->sock, &trigger, app->token_communication.handle, &ua_token->obj); | |
1909 | pthread_mutex_unlock(&app->sock_lock); | |
1910 | if (ret < 0) { | |
1911 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1912 | abort(); | |
1913 | ERR("Error ustctl create trigger %s for app pid: %d with ret %d", | |
1914 | trigger.name, app->pid, ret); | |
1915 | } else { | |
1916 | /* | |
1917 | * This is normal behavior, an application can die during the | |
1918 | * creation process. Don't report an error so the execution can | |
1919 | * continue normally. | |
1920 | */ | |
1921 | ret = 0; | |
1922 | DBG3("UST app create event failed. Application is dead."); | |
1923 | } | |
1924 | goto error; | |
1925 | } | |
1926 | ||
1927 | ua_token->handle = ua_token->obj->handle; | |
1928 | ||
1929 | DBG2("UST app event %s created successfully for pid:%d object: %p", | |
1930 | trigger.name, app->pid, ua_token->obj); | |
1931 | ||
1932 | health_code_update(); | |
1933 | ||
1934 | /* Set filter if one is present. */ | |
1935 | if (ua_token->filter) { | |
1936 | ret = set_ust_filter(app, ua_token->filter, ua_token->obj); | |
1937 | if (ret < 0) { | |
1938 | goto error; | |
1939 | } | |
1940 | } | |
1941 | ||
1942 | /* Set exclusions for the event */ | |
1943 | if (ua_token->exclusion) { | |
1944 | ret = set_ust_exclusions(app, ua_token->exclusion, ua_token->obj); | |
1945 | if (ret < 0) { | |
1946 | goto error; | |
1947 | } | |
1948 | } | |
1949 | ||
1950 | /* | |
1951 | * We now need to explicitly enable the event, since it | |
1952 | * is disabled at creation. | |
1953 | */ | |
1954 | ret = enable_ust_object(app, ua_token->obj); | |
1955 | if (ret < 0) { | |
1956 | /* | |
1957 | * If we hit an EPERM, something is wrong with our enable call. If | |
1958 | * we get an EEXIST, there is a problem on the tracer side since we | |
1959 | * just created it. | |
1960 | */ | |
1961 | switch (ret) { | |
1962 | case -LTTNG_UST_ERR_PERM: | |
1963 | /* Code flow problem */ | |
1964 | assert(0); | |
1965 | case -LTTNG_UST_ERR_EXIST: | |
1966 | /* It's OK for our use case. */ | |
1967 | ret = 0; | |
1968 | break; | |
1969 | default: | |
1970 | break; | |
1971 | } | |
1972 | goto error; | |
1973 | } | |
1974 | ua_token->enabled = true; | |
1975 | ||
1976 | error: | |
1977 | health_code_update(); | |
1978 | return ret; | |
1979 | } | |
1980 | ||
5b4a0ec0 DG |
1981 | /* |
1982 | * Copy data between an UST app event and a LTT event. | |
1983 | */ | |
421cb601 | 1984 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1985 | struct ltt_ust_event *uevent) |
1986 | { | |
b4ffad32 JI |
1987 | size_t exclusion_alloc_size; |
1988 | ||
48842b30 DG |
1989 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); |
1990 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1991 | ||
fc34caaa DG |
1992 | ua_event->enabled = uevent->enabled; |
1993 | ||
5b4a0ec0 DG |
1994 | /* Copy event attributes */ |
1995 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1996 | ||
53a80697 MD |
1997 | /* Copy filter bytecode */ |
1998 | if (uevent->filter) { | |
51755dc8 | 1999 | ua_event->filter = copy_filter_bytecode(uevent->filter); |
025faf73 | 2000 | /* Filter might be NULL here in case of ENONEM. */ |
53a80697 | 2001 | } |
b4ffad32 JI |
2002 | |
2003 | /* Copy exclusion data */ | |
2004 | if (uevent->exclusion) { | |
51755dc8 | 2005 | exclusion_alloc_size = sizeof(struct lttng_event_exclusion) + |
b4ffad32 JI |
2006 | LTTNG_UST_SYM_NAME_LEN * uevent->exclusion->count; |
2007 | ua_event->exclusion = zmalloc(exclusion_alloc_size); | |
5f8df26c JI |
2008 | if (ua_event->exclusion == NULL) { |
2009 | PERROR("malloc"); | |
2010 | } else { | |
2011 | memcpy(ua_event->exclusion, uevent->exclusion, | |
2012 | exclusion_alloc_size); | |
b4ffad32 JI |
2013 | } |
2014 | } | |
48842b30 DG |
2015 | } |
2016 | ||
5b4a0ec0 DG |
2017 | /* |
2018 | * Copy data between an UST app channel and a LTT channel. | |
2019 | */ | |
421cb601 | 2020 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
2021 | struct ltt_ust_channel *uchan) |
2022 | { | |
fc34caaa | 2023 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
2024 | |
2025 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
2026 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 2027 | |
1624d5b7 JD |
2028 | ua_chan->tracefile_size = uchan->tracefile_size; |
2029 | ua_chan->tracefile_count = uchan->tracefile_count; | |
2030 | ||
ffe60014 DG |
2031 | /* Copy event attributes since the layout is different. */ |
2032 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
2033 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
2034 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
2035 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
2036 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
e9404c27 | 2037 | ua_chan->monitor_timer_interval = uchan->monitor_timer_interval; |
ffe60014 | 2038 | ua_chan->attr.output = uchan->attr.output; |
491d1539 MD |
2039 | ua_chan->attr.blocking_timeout = uchan->attr.u.s.blocking_timeout; |
2040 | ||
ffe60014 DG |
2041 | /* |
2042 | * Note that the attribute channel type is not set since the channel on the | |
2043 | * tracing registry side does not have this information. | |
2044 | */ | |
48842b30 | 2045 | |
fc34caaa | 2046 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 2047 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 2048 | |
fc34caaa | 2049 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
2050 | } |
2051 | ||
5b4a0ec0 DG |
2052 | /* |
2053 | * Copy data between a UST app session and a regular LTT session. | |
2054 | */ | |
421cb601 | 2055 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 2056 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 2057 | { |
477d7741 MD |
2058 | struct tm *timeinfo; |
2059 | char datetime[16]; | |
2060 | int ret; | |
d7ba1388 | 2061 | char tmp_shm_path[PATH_MAX]; |
477d7741 | 2062 | |
940c4592 | 2063 | timeinfo = localtime(&app->registration_time); |
477d7741 | 2064 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); |
48842b30 | 2065 | |
421cb601 | 2066 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 2067 | |
7972aab2 DG |
2068 | ua_sess->tracing_id = usess->id; |
2069 | ua_sess->id = get_next_session_id(); | |
470cc211 JG |
2070 | ua_sess->real_credentials.uid = app->uid; |
2071 | ua_sess->real_credentials.gid = app->gid; | |
2072 | ua_sess->effective_credentials.uid = usess->uid; | |
2073 | ua_sess->effective_credentials.gid = usess->gid; | |
7972aab2 DG |
2074 | ua_sess->buffer_type = usess->buffer_type; |
2075 | ua_sess->bits_per_long = app->bits_per_long; | |
6addfa37 | 2076 | |
7972aab2 | 2077 | /* There is only one consumer object per session possible. */ |
6addfa37 | 2078 | consumer_output_get(usess->consumer); |
7972aab2 | 2079 | ua_sess->consumer = usess->consumer; |
6addfa37 | 2080 | |
2bba9e53 | 2081 | ua_sess->output_traces = usess->output_traces; |
ecc48a90 | 2082 | ua_sess->live_timer_interval = usess->live_timer_interval; |
84ad93e8 DG |
2083 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, |
2084 | &usess->metadata_attr); | |
7972aab2 DG |
2085 | |
2086 | switch (ua_sess->buffer_type) { | |
2087 | case LTTNG_BUFFER_PER_PID: | |
2088 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 2089 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
2090 | datetime); |
2091 | break; | |
2092 | case LTTNG_BUFFER_PER_UID: | |
2093 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
470cc211 JG |
2094 | DEFAULT_UST_TRACE_UID_PATH, |
2095 | ua_sess->real_credentials.uid, | |
2096 | app->bits_per_long); | |
7972aab2 DG |
2097 | break; |
2098 | default: | |
2099 | assert(0); | |
2100 | goto error; | |
2101 | } | |
477d7741 MD |
2102 | if (ret < 0) { |
2103 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 2104 | assert(0); |
7972aab2 | 2105 | goto error; |
477d7741 MD |
2106 | } |
2107 | ||
3d071855 MD |
2108 | strncpy(ua_sess->root_shm_path, usess->root_shm_path, |
2109 | sizeof(ua_sess->root_shm_path)); | |
2110 | ua_sess->root_shm_path[sizeof(ua_sess->root_shm_path) - 1] = '\0'; | |
d7ba1388 MD |
2111 | strncpy(ua_sess->shm_path, usess->shm_path, |
2112 | sizeof(ua_sess->shm_path)); | |
2113 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
2114 | if (ua_sess->shm_path[0]) { | |
2115 | switch (ua_sess->buffer_type) { | |
2116 | case LTTNG_BUFFER_PER_PID: | |
2117 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
5da88b0f | 2118 | "/" DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", |
d7ba1388 MD |
2119 | app->name, app->pid, datetime); |
2120 | break; | |
2121 | case LTTNG_BUFFER_PER_UID: | |
2122 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
5da88b0f | 2123 | "/" DEFAULT_UST_TRACE_UID_PATH, |
d7ba1388 MD |
2124 | app->uid, app->bits_per_long); |
2125 | break; | |
2126 | default: | |
2127 | assert(0); | |
2128 | goto error; | |
2129 | } | |
2130 | if (ret < 0) { | |
2131 | PERROR("sprintf UST shadow copy session"); | |
2132 | assert(0); | |
2133 | goto error; | |
2134 | } | |
2135 | strncat(ua_sess->shm_path, tmp_shm_path, | |
2136 | sizeof(ua_sess->shm_path) - strlen(ua_sess->shm_path) - 1); | |
2137 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
2138 | } | |
6addfa37 | 2139 | return; |
7972aab2 DG |
2140 | |
2141 | error: | |
6addfa37 | 2142 | consumer_output_put(ua_sess->consumer); |
48842b30 DG |
2143 | } |
2144 | ||
78f0bacd DG |
2145 | /* |
2146 | * Lookup sesison wrapper. | |
2147 | */ | |
84cd17c6 | 2148 | static |
fb9a95c4 | 2149 | void __lookup_session_by_app(const struct ltt_ust_session *usess, |
bec39940 | 2150 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
2151 | { |
2152 | /* Get right UST app session from app */ | |
d9bf3ca4 | 2153 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
2154 | } |
2155 | ||
421cb601 DG |
2156 | /* |
2157 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 2158 | * id. |
421cb601 | 2159 | */ |
48842b30 | 2160 | static struct ust_app_session *lookup_session_by_app( |
fb9a95c4 | 2161 | const struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 2162 | { |
bec39940 | 2163 | struct lttng_ht_iter iter; |
d9bf3ca4 | 2164 | struct lttng_ht_node_u64 *node; |
48842b30 | 2165 | |
84cd17c6 | 2166 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 2167 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
2168 | if (node == NULL) { |
2169 | goto error; | |
2170 | } | |
2171 | ||
2172 | return caa_container_of(node, struct ust_app_session, node); | |
2173 | ||
2174 | error: | |
2175 | return NULL; | |
2176 | } | |
2177 | ||
7972aab2 DG |
2178 | /* |
2179 | * Setup buffer registry per PID for the given session and application. If none | |
2180 | * is found, a new one is created, added to the global registry and | |
2181 | * initialized. If regp is valid, it's set with the newly created object. | |
2182 | * | |
2183 | * Return 0 on success or else a negative value. | |
2184 | */ | |
2185 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
2186 | struct ust_app *app, struct buffer_reg_pid **regp) | |
2187 | { | |
2188 | int ret = 0; | |
2189 | struct buffer_reg_pid *reg_pid; | |
2190 | ||
2191 | assert(ua_sess); | |
2192 | assert(app); | |
2193 | ||
2194 | rcu_read_lock(); | |
2195 | ||
2196 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
2197 | if (!reg_pid) { | |
2198 | /* | |
2199 | * This is the create channel path meaning that if there is NO | |
2200 | * registry available, we have to create one for this session. | |
2201 | */ | |
d7ba1388 | 2202 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid, |
3d071855 | 2203 | ua_sess->root_shm_path, ua_sess->shm_path); |
7972aab2 DG |
2204 | if (ret < 0) { |
2205 | goto error; | |
2206 | } | |
7972aab2 DG |
2207 | } else { |
2208 | goto end; | |
2209 | } | |
2210 | ||
2211 | /* Initialize registry. */ | |
2212 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
2213 | app->bits_per_long, app->uint8_t_alignment, | |
2214 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf | 2215 | app->uint64_t_alignment, app->long_alignment, |
470cc211 JG |
2216 | app->byte_order, app->version.major, app->version.minor, |
2217 | reg_pid->root_shm_path, reg_pid->shm_path, | |
2218 | ua_sess->effective_credentials.uid, | |
8de88061 JR |
2219 | ua_sess->effective_credentials.gid, ua_sess->tracing_id, |
2220 | app->uid); | |
7972aab2 | 2221 | if (ret < 0) { |
286c991a MD |
2222 | /* |
2223 | * reg_pid->registry->reg.ust is NULL upon error, so we need to | |
2224 | * destroy the buffer registry, because it is always expected | |
2225 | * that if the buffer registry can be found, its ust registry is | |
2226 | * non-NULL. | |
2227 | */ | |
2228 | buffer_reg_pid_destroy(reg_pid); | |
7972aab2 DG |
2229 | goto error; |
2230 | } | |
2231 | ||
286c991a MD |
2232 | buffer_reg_pid_add(reg_pid); |
2233 | ||
7972aab2 DG |
2234 | DBG3("UST app buffer registry per PID created successfully"); |
2235 | ||
2236 | end: | |
2237 | if (regp) { | |
2238 | *regp = reg_pid; | |
2239 | } | |
2240 | error: | |
2241 | rcu_read_unlock(); | |
2242 | return ret; | |
2243 | } | |
2244 | ||
2245 | /* | |
2246 | * Setup buffer registry per UID for the given session and application. If none | |
2247 | * is found, a new one is created, added to the global registry and | |
2248 | * initialized. If regp is valid, it's set with the newly created object. | |
2249 | * | |
2250 | * Return 0 on success or else a negative value. | |
2251 | */ | |
2252 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
d7ba1388 | 2253 | struct ust_app_session *ua_sess, |
7972aab2 DG |
2254 | struct ust_app *app, struct buffer_reg_uid **regp) |
2255 | { | |
2256 | int ret = 0; | |
2257 | struct buffer_reg_uid *reg_uid; | |
2258 | ||
2259 | assert(usess); | |
2260 | assert(app); | |
2261 | ||
2262 | rcu_read_lock(); | |
2263 | ||
2264 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2265 | if (!reg_uid) { | |
2266 | /* | |
2267 | * This is the create channel path meaning that if there is NO | |
2268 | * registry available, we have to create one for this session. | |
2269 | */ | |
2270 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
3d071855 MD |
2271 | LTTNG_DOMAIN_UST, ®_uid, |
2272 | ua_sess->root_shm_path, ua_sess->shm_path); | |
7972aab2 DG |
2273 | if (ret < 0) { |
2274 | goto error; | |
2275 | } | |
7972aab2 DG |
2276 | } else { |
2277 | goto end; | |
2278 | } | |
2279 | ||
2280 | /* Initialize registry. */ | |
af6142cf | 2281 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
2282 | app->bits_per_long, app->uint8_t_alignment, |
2283 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
2284 | app->uint64_t_alignment, app->long_alignment, |
2285 | app->byte_order, app->version.major, | |
3d071855 | 2286 | app->version.minor, reg_uid->root_shm_path, |
8de88061 JR |
2287 | reg_uid->shm_path, usess->uid, usess->gid, |
2288 | ua_sess->tracing_id, app->uid); | |
7972aab2 | 2289 | if (ret < 0) { |
286c991a MD |
2290 | /* |
2291 | * reg_uid->registry->reg.ust is NULL upon error, so we need to | |
2292 | * destroy the buffer registry, because it is always expected | |
2293 | * that if the buffer registry can be found, its ust registry is | |
2294 | * non-NULL. | |
2295 | */ | |
2296 | buffer_reg_uid_destroy(reg_uid, NULL); | |
7972aab2 DG |
2297 | goto error; |
2298 | } | |
2299 | /* Add node to teardown list of the session. */ | |
2300 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
2301 | ||
286c991a | 2302 | buffer_reg_uid_add(reg_uid); |
7972aab2 | 2303 | |
286c991a | 2304 | DBG3("UST app buffer registry per UID created successfully"); |
7972aab2 DG |
2305 | end: |
2306 | if (regp) { | |
2307 | *regp = reg_uid; | |
2308 | } | |
2309 | error: | |
2310 | rcu_read_unlock(); | |
2311 | return ret; | |
2312 | } | |
2313 | ||
421cb601 | 2314 | /* |
3d8ca23b | 2315 | * Create a session on the tracer side for the given app. |
421cb601 | 2316 | * |
3d8ca23b DG |
2317 | * On success, ua_sess_ptr is populated with the session pointer or else left |
2318 | * untouched. If the session was created, is_created is set to 1. On error, | |
2319 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
2320 | * be NULL. | |
2321 | * | |
2322 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
2323 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 2324 | */ |
03f91eaa | 2325 | static int find_or_create_ust_app_session(struct ltt_ust_session *usess, |
3d8ca23b DG |
2326 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, |
2327 | int *is_created) | |
421cb601 | 2328 | { |
3d8ca23b | 2329 | int ret, created = 0; |
421cb601 DG |
2330 | struct ust_app_session *ua_sess; |
2331 | ||
3d8ca23b DG |
2332 | assert(usess); |
2333 | assert(app); | |
2334 | assert(ua_sess_ptr); | |
2335 | ||
840cb59c | 2336 | health_code_update(); |
86acf0da | 2337 | |
421cb601 DG |
2338 | ua_sess = lookup_session_by_app(usess, app); |
2339 | if (ua_sess == NULL) { | |
d9bf3ca4 | 2340 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 2341 | app->pid, usess->id); |
40bbd087 | 2342 | ua_sess = alloc_ust_app_session(); |
421cb601 DG |
2343 | if (ua_sess == NULL) { |
2344 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
2345 | ret = -ENOMEM; |
2346 | goto error; | |
421cb601 | 2347 | } |
477d7741 | 2348 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 2349 | created = 1; |
421cb601 DG |
2350 | } |
2351 | ||
7972aab2 DG |
2352 | switch (usess->buffer_type) { |
2353 | case LTTNG_BUFFER_PER_PID: | |
2354 | /* Init local registry. */ | |
2355 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 2356 | if (ret < 0) { |
e64207cf | 2357 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2358 | goto error; |
2359 | } | |
2360 | break; | |
2361 | case LTTNG_BUFFER_PER_UID: | |
2362 | /* Look for a global registry. If none exists, create one. */ | |
d7ba1388 | 2363 | ret = setup_buffer_reg_uid(usess, ua_sess, app, NULL); |
7972aab2 | 2364 | if (ret < 0) { |
e64207cf | 2365 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2366 | goto error; |
2367 | } | |
2368 | break; | |
2369 | default: | |
2370 | assert(0); | |
2371 | ret = -EINVAL; | |
2372 | goto error; | |
2373 | } | |
2374 | ||
2375 | health_code_update(); | |
2376 | ||
2377 | if (ua_sess->handle == -1) { | |
fb45065e | 2378 | pthread_mutex_lock(&app->sock_lock); |
7972aab2 | 2379 | ret = ustctl_create_session(app->sock); |
fb45065e | 2380 | pthread_mutex_unlock(&app->sock_lock); |
7972aab2 DG |
2381 | if (ret < 0) { |
2382 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
2383 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
2384 | app->pid, ret); |
2385 | } else { | |
2386 | DBG("UST app creating session failed. Application is dead"); | |
3757b385 DG |
2387 | /* |
2388 | * This is normal behavior, an application can die during the | |
2389 | * creation process. Don't report an error so the execution can | |
2390 | * continue normally. This will get flagged ENOTCONN and the | |
2391 | * caller will handle it. | |
2392 | */ | |
2393 | ret = 0; | |
ffe60014 | 2394 | } |
d0b96690 | 2395 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
2396 | if (ret != -ENOMEM) { |
2397 | /* | |
2398 | * Tracer is probably gone or got an internal error so let's | |
2399 | * behave like it will soon unregister or not usable. | |
2400 | */ | |
2401 | ret = -ENOTCONN; | |
2402 | } | |
2403 | goto error; | |
421cb601 DG |
2404 | } |
2405 | ||
7972aab2 DG |
2406 | ua_sess->handle = ret; |
2407 | ||
2408 | /* Add ust app session to app's HT */ | |
d9bf3ca4 MD |
2409 | lttng_ht_node_init_u64(&ua_sess->node, |
2410 | ua_sess->tracing_id); | |
2411 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
10b56aef MD |
2412 | lttng_ht_node_init_ulong(&ua_sess->ust_objd_node, ua_sess->handle); |
2413 | lttng_ht_add_unique_ulong(app->ust_sessions_objd, | |
2414 | &ua_sess->ust_objd_node); | |
7972aab2 DG |
2415 | |
2416 | DBG2("UST app session created successfully with handle %d", ret); | |
2417 | } | |
2418 | ||
2419 | *ua_sess_ptr = ua_sess; | |
2420 | if (is_created) { | |
2421 | *is_created = created; | |
2422 | } | |
2423 | ||
2424 | /* Everything went well. */ | |
2425 | ret = 0; | |
2426 | ||
2427 | error: | |
2428 | health_code_update(); | |
2429 | return ret; | |
2430 | } | |
2431 | ||
6a6b2068 JG |
2432 | /* |
2433 | * Match function for a hash table lookup of ust_app_ctx. | |
2434 | * | |
2435 | * It matches an ust app context based on the context type and, in the case | |
2436 | * of perf counters, their name. | |
2437 | */ | |
2438 | static int ht_match_ust_app_ctx(struct cds_lfht_node *node, const void *_key) | |
2439 | { | |
2440 | struct ust_app_ctx *ctx; | |
bdf64013 | 2441 | const struct lttng_ust_context_attr *key; |
6a6b2068 JG |
2442 | |
2443 | assert(node); | |
2444 | assert(_key); | |
2445 | ||
2446 | ctx = caa_container_of(node, struct ust_app_ctx, node.node); | |
2447 | key = _key; | |
2448 | ||
2449 | /* Context type */ | |
2450 | if (ctx->ctx.ctx != key->ctx) { | |
2451 | goto no_match; | |
2452 | } | |
2453 | ||
bdf64013 JG |
2454 | switch(key->ctx) { |
2455 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: | |
6a6b2068 | 2456 | if (strncmp(key->u.perf_counter.name, |
bdf64013 JG |
2457 | ctx->ctx.u.perf_counter.name, |
2458 | sizeof(key->u.perf_counter.name))) { | |
2459 | goto no_match; | |
2460 | } | |
2461 | break; | |
2462 | case LTTNG_UST_CONTEXT_APP_CONTEXT: | |
2463 | if (strcmp(key->u.app_ctx.provider_name, | |
2464 | ctx->ctx.u.app_ctx.provider_name) || | |
2465 | strcmp(key->u.app_ctx.ctx_name, | |
2466 | ctx->ctx.u.app_ctx.ctx_name)) { | |
6a6b2068 JG |
2467 | goto no_match; |
2468 | } | |
bdf64013 JG |
2469 | break; |
2470 | default: | |
2471 | break; | |
6a6b2068 JG |
2472 | } |
2473 | ||
2474 | /* Match. */ | |
2475 | return 1; | |
2476 | ||
2477 | no_match: | |
2478 | return 0; | |
2479 | } | |
2480 | ||
2481 | /* | |
2482 | * Lookup for an ust app context from an lttng_ust_context. | |
2483 | * | |
be184a0f | 2484 | * Must be called while holding RCU read side lock. |
6a6b2068 JG |
2485 | * Return an ust_app_ctx object or NULL on error. |
2486 | */ | |
2487 | static | |
2488 | struct ust_app_ctx *find_ust_app_context(struct lttng_ht *ht, | |
bdf64013 | 2489 | struct lttng_ust_context_attr *uctx) |
6a6b2068 JG |
2490 | { |
2491 | struct lttng_ht_iter iter; | |
2492 | struct lttng_ht_node_ulong *node; | |
2493 | struct ust_app_ctx *app_ctx = NULL; | |
2494 | ||
2495 | assert(uctx); | |
2496 | assert(ht); | |
2497 | ||
2498 | /* Lookup using the lttng_ust_context_type and a custom match fct. */ | |
2499 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) uctx->ctx, lttng_ht_seed), | |
2500 | ht_match_ust_app_ctx, uctx, &iter.iter); | |
2501 | node = lttng_ht_iter_get_node_ulong(&iter); | |
2502 | if (!node) { | |
2503 | goto end; | |
2504 | } | |
2505 | ||
2506 | app_ctx = caa_container_of(node, struct ust_app_ctx, node); | |
2507 | ||
2508 | end: | |
2509 | return app_ctx; | |
2510 | } | |
2511 | ||
7972aab2 DG |
2512 | /* |
2513 | * Create a context for the channel on the tracer. | |
2514 | * | |
2515 | * Called with UST app session lock held and a RCU read side lock. | |
2516 | */ | |
2517 | static | |
c9edf082 | 2518 | int create_ust_app_channel_context(struct ust_app_channel *ua_chan, |
bdf64013 | 2519 | struct lttng_ust_context_attr *uctx, |
7972aab2 DG |
2520 | struct ust_app *app) |
2521 | { | |
2522 | int ret = 0; | |
7972aab2 DG |
2523 | struct ust_app_ctx *ua_ctx; |
2524 | ||
2525 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
2526 | ||
6a6b2068 JG |
2527 | ua_ctx = find_ust_app_context(ua_chan->ctx, uctx); |
2528 | if (ua_ctx) { | |
7972aab2 DG |
2529 | ret = -EEXIST; |
2530 | goto error; | |
2531 | } | |
2532 | ||
2533 | ua_ctx = alloc_ust_app_ctx(uctx); | |
2534 | if (ua_ctx == NULL) { | |
2535 | /* malloc failed */ | |
7682f304 | 2536 | ret = -ENOMEM; |
7972aab2 DG |
2537 | goto error; |
2538 | } | |
2539 | ||
2540 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 2541 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 2542 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
2543 | |
2544 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
2545 | if (ret < 0) { | |
2546 | goto error; | |
2547 | } | |
2548 | ||
2549 | error: | |
2550 | return ret; | |
2551 | } | |
2552 | ||
2553 | /* | |
2554 | * Enable on the tracer side a ust app event for the session and channel. | |
2555 | * | |
2556 | * Called with UST app session lock held. | |
2557 | */ | |
2558 | static | |
2559 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
2560 | struct ust_app_event *ua_event, struct ust_app *app) | |
2561 | { | |
2562 | int ret; | |
2563 | ||
d3a684ee | 2564 | ret = enable_ust_object(app, ua_event->obj); |
7972aab2 DG |
2565 | if (ret < 0) { |
2566 | goto error; | |
2567 | } | |
2568 | ||
2569 | ua_event->enabled = 1; | |
2570 | ||
2571 | error: | |
2572 | return ret; | |
2573 | } | |
2574 | ||
2575 | /* | |
2576 | * Disable on the tracer side a ust app event for the session and channel. | |
2577 | */ | |
2578 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
2579 | struct ust_app_event *ua_event, struct ust_app *app) | |
2580 | { | |
2581 | int ret; | |
2582 | ||
d3a684ee | 2583 | ret = disable_ust_object(app, ua_event->obj); |
7972aab2 DG |
2584 | if (ret < 0) { |
2585 | goto error; | |
2586 | } | |
2587 | ||
2588 | ua_event->enabled = 0; | |
2589 | ||
2590 | error: | |
2591 | return ret; | |
2592 | } | |
2593 | ||
2594 | /* | |
2595 | * Lookup ust app channel for session and disable it on the tracer side. | |
2596 | */ | |
2597 | static | |
2598 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
2599 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
2600 | { | |
2601 | int ret; | |
2602 | ||
2603 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2604 | if (ret < 0) { | |
2605 | goto error; | |
2606 | } | |
2607 | ||
2608 | ua_chan->enabled = 0; | |
2609 | ||
2610 | error: | |
2611 | return ret; | |
2612 | } | |
2613 | ||
2614 | /* | |
2615 | * Lookup ust app channel for session and enable it on the tracer side. This | |
2616 | * MUST be called with a RCU read side lock acquired. | |
2617 | */ | |
2618 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
2619 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
2620 | { | |
2621 | int ret = 0; | |
2622 | struct lttng_ht_iter iter; | |
2623 | struct lttng_ht_node_str *ua_chan_node; | |
2624 | struct ust_app_channel *ua_chan; | |
2625 | ||
2626 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
2627 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
2628 | if (ua_chan_node == NULL) { | |
d9bf3ca4 | 2629 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
2630 | uchan->name, ua_sess->tracing_id); |
2631 | goto error; | |
2632 | } | |
2633 | ||
2634 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2635 | ||
2636 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
2637 | if (ret < 0) { | |
2638 | goto error; | |
2639 | } | |
2640 | ||
2641 | error: | |
2642 | return ret; | |
2643 | } | |
2644 | ||
2645 | /* | |
2646 | * Ask the consumer to create a channel and get it if successful. | |
2647 | * | |
fad1ed2f JR |
2648 | * Called with UST app session lock held. |
2649 | * | |
7972aab2 DG |
2650 | * Return 0 on success or else a negative value. |
2651 | */ | |
2652 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
2653 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
e098433c JG |
2654 | int bitness, struct ust_registry_session *registry, |
2655 | uint64_t trace_archive_id) | |
7972aab2 DG |
2656 | { |
2657 | int ret; | |
2658 | unsigned int nb_fd = 0; | |
2659 | struct consumer_socket *socket; | |
2660 | ||
2661 | assert(usess); | |
2662 | assert(ua_sess); | |
2663 | assert(ua_chan); | |
2664 | assert(registry); | |
2665 | ||
2666 | rcu_read_lock(); | |
2667 | health_code_update(); | |
2668 | ||
2669 | /* Get the right consumer socket for the application. */ | |
2670 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
2671 | if (!socket) { | |
2672 | ret = -EINVAL; | |
2673 | goto error; | |
2674 | } | |
2675 | ||
2676 | health_code_update(); | |
2677 | ||
2678 | /* Need one fd for the channel. */ | |
2679 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2680 | if (ret < 0) { | |
2681 | ERR("Exhausted number of available FD upon create channel"); | |
2682 | goto error; | |
2683 | } | |
2684 | ||
2685 | /* | |
2686 | * Ask consumer to create channel. The consumer will return the number of | |
2687 | * stream we have to expect. | |
2688 | */ | |
2689 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
d2956687 | 2690 | registry, usess->current_trace_chunk); |
7972aab2 DG |
2691 | if (ret < 0) { |
2692 | goto error_ask; | |
2693 | } | |
2694 | ||
2695 | /* | |
2696 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2697 | * stream (2 being the default value here). | |
2698 | */ | |
2699 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2700 | ||
2701 | /* Reserve the amount of file descriptor we need. */ | |
2702 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2703 | if (ret < 0) { | |
2704 | ERR("Exhausted number of available FD upon create channel"); | |
2705 | goto error_fd_get_stream; | |
2706 | } | |
2707 | ||
2708 | health_code_update(); | |
2709 | ||
2710 | /* | |
2711 | * Now get the channel from the consumer. This call wil populate the stream | |
2712 | * list of that channel and set the ust objects. | |
2713 | */ | |
d9078d0c DG |
2714 | if (usess->consumer->enabled) { |
2715 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2716 | if (ret < 0) { | |
2717 | goto error_destroy; | |
2718 | } | |
7972aab2 DG |
2719 | } |
2720 | ||
2721 | rcu_read_unlock(); | |
2722 | return 0; | |
2723 | ||
2724 | error_destroy: | |
2725 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2726 | error_fd_get_stream: | |
2727 | /* | |
2728 | * Initiate a destroy channel on the consumer since we had an error | |
2729 | * handling it on our side. The return value is of no importance since we | |
2730 | * already have a ret value set by the previous error that we need to | |
2731 | * return. | |
2732 | */ | |
2733 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2734 | error_ask: | |
2735 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2736 | error: | |
2737 | health_code_update(); | |
2738 | rcu_read_unlock(); | |
2739 | return ret; | |
2740 | } | |
2741 | ||
2742 | /* | |
2743 | * Duplicate the ust data object of the ust app stream and save it in the | |
2744 | * buffer registry stream. | |
2745 | * | |
2746 | * Return 0 on success or else a negative value. | |
2747 | */ | |
2748 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2749 | struct ust_app_stream *stream) | |
2750 | { | |
2751 | int ret; | |
2752 | ||
2753 | assert(reg_stream); | |
2754 | assert(stream); | |
2755 | ||
2756 | /* Reserve the amount of file descriptor we need. */ | |
2757 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2758 | if (ret < 0) { | |
2759 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2760 | goto error; | |
2761 | } | |
2762 | ||
2763 | /* Duplicate object for stream once the original is in the registry. */ | |
2764 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2765 | reg_stream->obj.ust); | |
2766 | if (ret < 0) { | |
2767 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2768 | reg_stream->obj.ust, stream->obj, ret); | |
2769 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2770 | goto error; | |
2771 | } | |
2772 | stream->handle = stream->obj->handle; | |
2773 | ||
2774 | error: | |
2775 | return ret; | |
2776 | } | |
2777 | ||
2778 | /* | |
2779 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2780 | * buffer registry channel. | |
2781 | * | |
2782 | * Return 0 on success or else a negative value. | |
2783 | */ | |
2784 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2785 | struct ust_app_channel *ua_chan) | |
2786 | { | |
2787 | int ret; | |
2788 | ||
2789 | assert(reg_chan); | |
2790 | assert(ua_chan); | |
2791 | ||
2792 | /* Need two fds for the channel. */ | |
2793 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2794 | if (ret < 0) { | |
2795 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2796 | goto error_fd_get; | |
2797 | } | |
2798 | ||
2799 | /* Duplicate object for stream once the original is in the registry. */ | |
2800 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2801 | if (ret < 0) { | |
2802 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2803 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2804 | goto error; | |
2805 | } | |
2806 | ua_chan->handle = ua_chan->obj->handle; | |
2807 | ||
2808 | return 0; | |
2809 | ||
2810 | error: | |
2811 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2812 | error_fd_get: | |
2813 | return ret; | |
2814 | } | |
2815 | ||
2816 | /* | |
2817 | * For a given channel buffer registry, setup all streams of the given ust | |
2818 | * application channel. | |
2819 | * | |
2820 | * Return 0 on success or else a negative value. | |
2821 | */ | |
2822 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
fb45065e MD |
2823 | struct ust_app_channel *ua_chan, |
2824 | struct ust_app *app) | |
7972aab2 DG |
2825 | { |
2826 | int ret = 0; | |
2827 | struct ust_app_stream *stream, *stmp; | |
2828 | ||
2829 | assert(reg_chan); | |
2830 | assert(ua_chan); | |
2831 | ||
2832 | DBG2("UST app setup buffer registry stream"); | |
2833 | ||
2834 | /* Send all streams to application. */ | |
2835 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2836 | struct buffer_reg_stream *reg_stream; | |
2837 | ||
2838 | ret = buffer_reg_stream_create(®_stream); | |
2839 | if (ret < 0) { | |
2840 | goto error; | |
2841 | } | |
2842 | ||
2843 | /* | |
2844 | * Keep original pointer and nullify it in the stream so the delete | |
2845 | * stream call does not release the object. | |
2846 | */ | |
2847 | reg_stream->obj.ust = stream->obj; | |
2848 | stream->obj = NULL; | |
2849 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2850 | |
7972aab2 DG |
2851 | /* We don't need the streams anymore. */ |
2852 | cds_list_del(&stream->list); | |
fb45065e | 2853 | delete_ust_app_stream(-1, stream, app); |
7972aab2 | 2854 | } |
421cb601 | 2855 | |
7972aab2 DG |
2856 | error: |
2857 | return ret; | |
2858 | } | |
2859 | ||
2860 | /* | |
2861 | * Create a buffer registry channel for the given session registry and | |
2862 | * application channel object. If regp pointer is valid, it's set with the | |
2863 | * created object. Important, the created object is NOT added to the session | |
2864 | * registry hash table. | |
2865 | * | |
2866 | * Return 0 on success else a negative value. | |
2867 | */ | |
2868 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2869 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2870 | { | |
2871 | int ret; | |
2872 | struct buffer_reg_channel *reg_chan = NULL; | |
2873 | ||
2874 | assert(reg_sess); | |
2875 | assert(ua_chan); | |
2876 | ||
2877 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2878 | ||
2879 | /* Create buffer registry channel. */ | |
2880 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2881 | if (ret < 0) { | |
2882 | goto error_create; | |
421cb601 | 2883 | } |
7972aab2 DG |
2884 | assert(reg_chan); |
2885 | reg_chan->consumer_key = ua_chan->key; | |
8c924c7b | 2886 | reg_chan->subbuf_size = ua_chan->attr.subbuf_size; |
d07ceecd | 2887 | reg_chan->num_subbuf = ua_chan->attr.num_subbuf; |
421cb601 | 2888 | |
7972aab2 DG |
2889 | /* Create and add a channel registry to session. */ |
2890 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2891 | ua_chan->tracing_channel_id); | |
2892 | if (ret < 0) { | |
2893 | goto error; | |
d88aee68 | 2894 | } |
7972aab2 | 2895 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2896 | |
7972aab2 DG |
2897 | if (regp) { |
2898 | *regp = reg_chan; | |
3d8ca23b | 2899 | } |
d88aee68 | 2900 | |
7972aab2 | 2901 | return 0; |
3d8ca23b DG |
2902 | |
2903 | error: | |
7972aab2 DG |
2904 | /* Safe because the registry channel object was not added to any HT. */ |
2905 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2906 | error_create: | |
3d8ca23b | 2907 | return ret; |
421cb601 DG |
2908 | } |
2909 | ||
55cc08a6 | 2910 | /* |
7972aab2 DG |
2911 | * Setup buffer registry channel for the given session registry and application |
2912 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2913 | * |
7972aab2 | 2914 | * Return 0 on success else a negative value. |
55cc08a6 | 2915 | */ |
7972aab2 | 2916 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
fb45065e MD |
2917 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan, |
2918 | struct ust_app *app) | |
55cc08a6 | 2919 | { |
7972aab2 | 2920 | int ret; |
55cc08a6 | 2921 | |
7972aab2 DG |
2922 | assert(reg_sess); |
2923 | assert(reg_chan); | |
2924 | assert(ua_chan); | |
2925 | assert(ua_chan->obj); | |
55cc08a6 | 2926 | |
7972aab2 | 2927 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2928 | |
7972aab2 | 2929 | /* Setup all streams for the registry. */ |
fb45065e | 2930 | ret = setup_buffer_reg_streams(reg_chan, ua_chan, app); |
7972aab2 | 2931 | if (ret < 0) { |
55cc08a6 DG |
2932 | goto error; |
2933 | } | |
2934 | ||
7972aab2 DG |
2935 | reg_chan->obj.ust = ua_chan->obj; |
2936 | ua_chan->obj = NULL; | |
55cc08a6 | 2937 | |
7972aab2 | 2938 | return 0; |
55cc08a6 DG |
2939 | |
2940 | error: | |
7972aab2 DG |
2941 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2942 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2943 | return ret; |
2944 | } | |
2945 | ||
edb67388 | 2946 | /* |
7972aab2 | 2947 | * Send buffer registry channel to the application. |
d0b96690 | 2948 | * |
7972aab2 | 2949 | * Return 0 on success else a negative value. |
edb67388 | 2950 | */ |
7972aab2 DG |
2951 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2952 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2953 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2954 | { |
2955 | int ret; | |
7972aab2 | 2956 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2957 | |
7972aab2 DG |
2958 | assert(reg_chan); |
2959 | assert(app); | |
2960 | assert(ua_sess); | |
2961 | assert(ua_chan); | |
2962 | ||
2963 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2964 | ||
2965 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2966 | if (ret < 0) { |
2967 | goto error; | |
2968 | } | |
2969 | ||
7972aab2 DG |
2970 | /* Send channel to the application. */ |
2971 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
2972 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
2973 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
2974 | goto error; | |
2975 | } else if (ret < 0) { | |
7972aab2 DG |
2976 | goto error; |
2977 | } | |
2978 | ||
2979 | health_code_update(); | |
2980 | ||
2981 | /* Send all streams to application. */ | |
2982 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2983 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2984 | struct ust_app_stream stream; | |
2985 | ||
2986 | ret = duplicate_stream_object(reg_stream, &stream); | |
2987 | if (ret < 0) { | |
2988 | goto error_stream_unlock; | |
2989 | } | |
2990 | ||
2991 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2992 | if (ret < 0) { | |
fb45065e | 2993 | (void) release_ust_app_stream(-1, &stream, app); |
a7169585 MD |
2994 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
2995 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
a7169585 | 2996 | } |
7972aab2 DG |
2997 | goto error_stream_unlock; |
2998 | } | |
edb67388 | 2999 | |
7972aab2 DG |
3000 | /* |
3001 | * The return value is not important here. This function will output an | |
3002 | * error if needed. | |
3003 | */ | |
fb45065e | 3004 | (void) release_ust_app_stream(-1, &stream, app); |
7972aab2 DG |
3005 | } |
3006 | ua_chan->is_sent = 1; | |
3007 | ||
3008 | error_stream_unlock: | |
3009 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
3010 | error: |
3011 | return ret; | |
3012 | } | |
3013 | ||
9730260e | 3014 | /* |
7972aab2 DG |
3015 | * Create and send to the application the created buffers with per UID buffers. |
3016 | * | |
9acdc1d6 | 3017 | * This MUST be called with a RCU read side lock acquired. |
71e0a100 | 3018 | * The session list lock and the session's lock must be acquired. |
9acdc1d6 | 3019 | * |
7972aab2 | 3020 | * Return 0 on success else a negative value. |
9730260e | 3021 | */ |
7972aab2 DG |
3022 | static int create_channel_per_uid(struct ust_app *app, |
3023 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
3024 | struct ust_app_channel *ua_chan) | |
9730260e DG |
3025 | { |
3026 | int ret; | |
7972aab2 DG |
3027 | struct buffer_reg_uid *reg_uid; |
3028 | struct buffer_reg_channel *reg_chan; | |
e32d7f27 | 3029 | struct ltt_session *session = NULL; |
e098433c JG |
3030 | enum lttng_error_code notification_ret; |
3031 | struct ust_registry_channel *chan_reg; | |
9730260e | 3032 | |
7972aab2 DG |
3033 | assert(app); |
3034 | assert(usess); | |
3035 | assert(ua_sess); | |
3036 | assert(ua_chan); | |
3037 | ||
3038 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
3039 | ||
3040 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
3041 | /* | |
3042 | * The session creation handles the creation of this global registry | |
3043 | * object. If none can be find, there is a code flow problem or a | |
3044 | * teardown race. | |
3045 | */ | |
3046 | assert(reg_uid); | |
3047 | ||
3048 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
3049 | reg_uid); | |
2721f7ea JG |
3050 | if (reg_chan) { |
3051 | goto send_channel; | |
3052 | } | |
7972aab2 | 3053 | |
2721f7ea JG |
3054 | /* Create the buffer registry channel object. */ |
3055 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
3056 | if (ret < 0) { | |
3057 | ERR("Error creating the UST channel \"%s\" registry instance", | |
f14256d6 | 3058 | ua_chan->name); |
2721f7ea JG |
3059 | goto error; |
3060 | } | |
f14256d6 | 3061 | |
e098433c JG |
3062 | session = session_find_by_id(ua_sess->tracing_id); |
3063 | assert(session); | |
3064 | assert(pthread_mutex_trylock(&session->lock)); | |
3065 | assert(session_trylock_list()); | |
3066 | ||
2721f7ea JG |
3067 | /* |
3068 | * Create the buffers on the consumer side. This call populates the | |
3069 | * ust app channel object with all streams and data object. | |
3070 | */ | |
3071 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
e098433c | 3072 | app->bits_per_long, reg_uid->registry->reg.ust, |
d2956687 | 3073 | session->most_recent_chunk_id.value); |
2721f7ea JG |
3074 | if (ret < 0) { |
3075 | ERR("Error creating UST channel \"%s\" on the consumer daemon", | |
3076 | ua_chan->name); | |
7972aab2 DG |
3077 | |
3078 | /* | |
2721f7ea JG |
3079 | * Let's remove the previously created buffer registry channel so |
3080 | * it's not visible anymore in the session registry. | |
7972aab2 | 3081 | */ |
2721f7ea JG |
3082 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, |
3083 | ua_chan->tracing_channel_id, false); | |
3084 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
3085 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
3086 | goto error; | |
7972aab2 DG |
3087 | } |
3088 | ||
2721f7ea JG |
3089 | /* |
3090 | * Setup the streams and add it to the session registry. | |
3091 | */ | |
3092 | ret = setup_buffer_reg_channel(reg_uid->registry, | |
3093 | ua_chan, reg_chan, app); | |
3094 | if (ret < 0) { | |
3095 | ERR("Error setting up UST channel \"%s\"", ua_chan->name); | |
3096 | goto error; | |
3097 | } | |
3098 | ||
e098433c JG |
3099 | /* Notify the notification subsystem of the channel's creation. */ |
3100 | pthread_mutex_lock(®_uid->registry->reg.ust->lock); | |
3101 | chan_reg = ust_registry_channel_find(reg_uid->registry->reg.ust, | |
3102 | ua_chan->tracing_channel_id); | |
3103 | assert(chan_reg); | |
3104 | chan_reg->consumer_key = ua_chan->key; | |
3105 | chan_reg = NULL; | |
3106 | pthread_mutex_unlock(®_uid->registry->reg.ust->lock); | |
e9404c27 | 3107 | |
e098433c JG |
3108 | notification_ret = notification_thread_command_add_channel( |
3109 | notification_thread_handle, session->name, | |
470cc211 JG |
3110 | ua_sess->effective_credentials.uid, |
3111 | ua_sess->effective_credentials.gid, ua_chan->name, | |
3112 | ua_chan->key, LTTNG_DOMAIN_UST, | |
e098433c JG |
3113 | ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf); |
3114 | if (notification_ret != LTTNG_OK) { | |
3115 | ret = - (int) notification_ret; | |
3116 | ERR("Failed to add channel to notification thread"); | |
3117 | goto error; | |
e9404c27 JG |
3118 | } |
3119 | ||
2721f7ea | 3120 | send_channel: |
66ff8e3f JG |
3121 | /* Send buffers to the application. */ |
3122 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
3123 | if (ret < 0) { | |
3124 | if (ret != -ENOTCONN) { | |
3125 | ERR("Error sending channel to application"); | |
3126 | } | |
3127 | goto error; | |
3128 | } | |
3129 | ||
9730260e | 3130 | error: |
e32d7f27 JG |
3131 | if (session) { |
3132 | session_put(session); | |
3133 | } | |
9730260e DG |
3134 | return ret; |
3135 | } | |
3136 | ||
78f0bacd | 3137 | /* |
7972aab2 DG |
3138 | * Create and send to the application the created buffers with per PID buffers. |
3139 | * | |
fad1ed2f | 3140 | * Called with UST app session lock held. |
71e0a100 | 3141 | * The session list lock and the session's lock must be acquired. |
fad1ed2f | 3142 | * |
7972aab2 | 3143 | * Return 0 on success else a negative value. |
78f0bacd | 3144 | */ |
7972aab2 DG |
3145 | static int create_channel_per_pid(struct ust_app *app, |
3146 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
3147 | struct ust_app_channel *ua_chan) | |
78f0bacd | 3148 | { |
8535a6d9 | 3149 | int ret; |
7972aab2 | 3150 | struct ust_registry_session *registry; |
e9404c27 | 3151 | enum lttng_error_code cmd_ret; |
e32d7f27 | 3152 | struct ltt_session *session = NULL; |
e9404c27 JG |
3153 | uint64_t chan_reg_key; |
3154 | struct ust_registry_channel *chan_reg; | |
78f0bacd | 3155 | |
7972aab2 DG |
3156 | assert(app); |
3157 | assert(usess); | |
3158 | assert(ua_sess); | |
3159 | assert(ua_chan); | |
3160 | ||
3161 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
3162 | ||
3163 | rcu_read_lock(); | |
3164 | ||
3165 | registry = get_session_registry(ua_sess); | |
fad1ed2f | 3166 | /* The UST app session lock is held, registry shall not be null. */ |
7972aab2 DG |
3167 | assert(registry); |
3168 | ||
3169 | /* Create and add a new channel registry to session. */ | |
3170 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd | 3171 | if (ret < 0) { |
f14256d6 MD |
3172 | ERR("Error creating the UST channel \"%s\" registry instance", |
3173 | ua_chan->name); | |
78f0bacd DG |
3174 | goto error; |
3175 | } | |
3176 | ||
e098433c JG |
3177 | session = session_find_by_id(ua_sess->tracing_id); |
3178 | assert(session); | |
3179 | ||
3180 | assert(pthread_mutex_trylock(&session->lock)); | |
3181 | assert(session_trylock_list()); | |
3182 | ||
7972aab2 DG |
3183 | /* Create and get channel on the consumer side. */ |
3184 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
e098433c | 3185 | app->bits_per_long, registry, |
d2956687 | 3186 | session->most_recent_chunk_id.value); |
7972aab2 | 3187 | if (ret < 0) { |
f14256d6 MD |
3188 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
3189 | ua_chan->name); | |
5b951542 | 3190 | goto error_remove_from_registry; |
7972aab2 DG |
3191 | } |
3192 | ||
3193 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
3194 | if (ret < 0) { | |
a7169585 MD |
3195 | if (ret != -ENOTCONN) { |
3196 | ERR("Error sending channel to application"); | |
3197 | } | |
5b951542 | 3198 | goto error_remove_from_registry; |
7972aab2 | 3199 | } |
8535a6d9 | 3200 | |
e9404c27 JG |
3201 | chan_reg_key = ua_chan->key; |
3202 | pthread_mutex_lock(®istry->lock); | |
3203 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
3204 | assert(chan_reg); | |
3205 | chan_reg->consumer_key = ua_chan->key; | |
3206 | pthread_mutex_unlock(®istry->lock); | |
3207 | ||
3208 | cmd_ret = notification_thread_command_add_channel( | |
3209 | notification_thread_handle, session->name, | |
470cc211 JG |
3210 | ua_sess->effective_credentials.uid, |
3211 | ua_sess->effective_credentials.gid, ua_chan->name, | |
3212 | ua_chan->key, LTTNG_DOMAIN_UST, | |
e9404c27 JG |
3213 | ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf); |
3214 | if (cmd_ret != LTTNG_OK) { | |
3215 | ret = - (int) cmd_ret; | |
3216 | ERR("Failed to add channel to notification thread"); | |
5b951542 | 3217 | goto error_remove_from_registry; |
e9404c27 JG |
3218 | } |
3219 | ||
5b951542 MD |
3220 | error_remove_from_registry: |
3221 | if (ret) { | |
3222 | ust_registry_channel_del_free(registry, ua_chan->key, false); | |
3223 | } | |
78f0bacd | 3224 | error: |
7972aab2 | 3225 | rcu_read_unlock(); |
e32d7f27 JG |
3226 | if (session) { |
3227 | session_put(session); | |
3228 | } | |
78f0bacd DG |
3229 | return ret; |
3230 | } | |
3231 | ||
3232 | /* | |
7972aab2 | 3233 | * From an already allocated ust app channel, create the channel buffers if |
88e3c2f5 | 3234 | * needed and send them to the application. This MUST be called with a RCU read |
7972aab2 DG |
3235 | * side lock acquired. |
3236 | * | |
fad1ed2f JR |
3237 | * Called with UST app session lock held. |
3238 | * | |
a7169585 MD |
3239 | * Return 0 on success or else a negative value. Returns -ENOTCONN if |
3240 | * the application exited concurrently. | |
78f0bacd | 3241 | */ |
88e3c2f5 | 3242 | static int ust_app_channel_send(struct ust_app *app, |
7972aab2 DG |
3243 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, |
3244 | struct ust_app_channel *ua_chan) | |
78f0bacd | 3245 | { |
7972aab2 | 3246 | int ret; |
78f0bacd | 3247 | |
7972aab2 DG |
3248 | assert(app); |
3249 | assert(usess); | |
88e3c2f5 | 3250 | assert(usess->active); |
7972aab2 DG |
3251 | assert(ua_sess); |
3252 | assert(ua_chan); | |
3253 | ||
3254 | /* Handle buffer type before sending the channel to the application. */ | |
3255 | switch (usess->buffer_type) { | |
3256 | case LTTNG_BUFFER_PER_UID: | |
3257 | { | |
3258 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
3259 | if (ret < 0) { | |
3260 | goto error; | |
3261 | } | |
3262 | break; | |
3263 | } | |
3264 | case LTTNG_BUFFER_PER_PID: | |
3265 | { | |
3266 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
3267 | if (ret < 0) { | |
3268 | goto error; | |
3269 | } | |
3270 | break; | |
3271 | } | |
3272 | default: | |
3273 | assert(0); | |
3274 | ret = -EINVAL; | |
78f0bacd DG |
3275 | goto error; |
3276 | } | |
3277 | ||
7972aab2 DG |
3278 | /* Initialize ust objd object using the received handle and add it. */ |
3279 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
3280 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 3281 | |
7972aab2 DG |
3282 | /* If channel is not enabled, disable it on the tracer */ |
3283 | if (!ua_chan->enabled) { | |
3284 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
3285 | if (ret < 0) { | |
3286 | goto error; | |
3287 | } | |
78f0bacd DG |
3288 | } |
3289 | ||
3290 | error: | |
3291 | return ret; | |
3292 | } | |
3293 | ||
284d8f55 | 3294 | /* |
88e3c2f5 | 3295 | * Create UST app channel and return it through ua_chanp if not NULL. |
d0b96690 | 3296 | * |
36b588ed | 3297 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 | 3298 | * |
88e3c2f5 | 3299 | * Return 0 on success or else a negative value. |
284d8f55 | 3300 | */ |
88e3c2f5 JG |
3301 | static int ust_app_channel_allocate(struct ust_app_session *ua_sess, |
3302 | struct ltt_ust_channel *uchan, | |
7972aab2 | 3303 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 3304 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
3305 | { |
3306 | int ret = 0; | |
bec39940 DG |
3307 | struct lttng_ht_iter iter; |
3308 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
3309 | struct ust_app_channel *ua_chan; |
3310 | ||
3311 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3312 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
3313 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 3314 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 3315 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 3316 | goto end; |
5b4a0ec0 DG |
3317 | } |
3318 | ||
d0b96690 | 3319 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
3320 | if (ua_chan == NULL) { |
3321 | /* Only malloc can fail here */ | |
4d710ac2 | 3322 | ret = -ENOMEM; |
88e3c2f5 | 3323 | goto error; |
fc34caaa DG |
3324 | } |
3325 | shadow_copy_channel(ua_chan, uchan); | |
3326 | ||
ffe60014 DG |
3327 | /* Set channel type. */ |
3328 | ua_chan->attr.type = type; | |
3329 | ||
d0b96690 DG |
3330 | /* Only add the channel if successful on the tracer side. */ |
3331 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
fc34caaa | 3332 | end: |
4d710ac2 DG |
3333 | if (ua_chanp) { |
3334 | *ua_chanp = ua_chan; | |
3335 | } | |
3336 | ||
3337 | /* Everything went well. */ | |
3338 | return 0; | |
5b4a0ec0 DG |
3339 | |
3340 | error: | |
4d710ac2 | 3341 | return ret; |
5b4a0ec0 DG |
3342 | } |
3343 | ||
3344 | /* | |
3345 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
3346 | * |
3347 | * Called with ust app session mutex held. | |
5b4a0ec0 | 3348 | */ |
edb67388 DG |
3349 | static |
3350 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
3351 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
3352 | struct ust_app *app) | |
284d8f55 | 3353 | { |
edb67388 | 3354 | int ret = 0; |
5b4a0ec0 | 3355 | struct ust_app_event *ua_event; |
284d8f55 | 3356 | |
edb67388 DG |
3357 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
3358 | if (ua_event == NULL) { | |
20533947 | 3359 | /* Only failure mode of alloc_ust_app_event(). */ |
edb67388 | 3360 | ret = -ENOMEM; |
fc34caaa | 3361 | goto end; |
5b4a0ec0 | 3362 | } |
edb67388 | 3363 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 3364 | |
edb67388 | 3365 | /* Create it on the tracer side */ |
5b4a0ec0 | 3366 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 3367 | if (ret < 0) { |
e9f11505 JG |
3368 | /* |
3369 | * Not found previously means that it does not exist on the | |
3370 | * tracer. If the application reports that the event existed, | |
3371 | * it means there is a bug in the sessiond or lttng-ust | |
3372 | * (or corruption, etc.) | |
3373 | */ | |
3374 | if (ret == -LTTNG_UST_ERR_EXIST) { | |
3375 | ERR("Tracer for application reported that an event being created already existed: " | |
3376 | "event_name = \"%s\", pid = %d, ppid = %d, uid = %d, gid = %d", | |
3377 | uevent->attr.name, | |
3378 | app->pid, app->ppid, app->uid, | |
3379 | app->gid); | |
3380 | } | |
284d8f55 DG |
3381 | goto error; |
3382 | } | |
3383 | ||
d0b96690 | 3384 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 3385 | |
fc34caaa | 3386 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 3387 | app->pid); |
7f79d3a1 | 3388 | |
edb67388 | 3389 | end: |
fc34caaa DG |
3390 | return ret; |
3391 | ||
5b4a0ec0 | 3392 | error: |
fc34caaa | 3393 | /* Valid. Calling here is already in a read side lock */ |
fb45065e | 3394 | delete_ust_app_event(-1, ua_event, app); |
edb67388 | 3395 | return ret; |
5b4a0ec0 DG |
3396 | } |
3397 | ||
d3a684ee JR |
3398 | /* |
3399 | * Create UST app event and create it on the tracer side. | |
3400 | * | |
3401 | * Called with ust app session mutex held. | |
3402 | */ | |
3403 | static | |
3404 | int create_ust_app_token_event_rule(struct lttng_event_rule *rule, | |
3405 | struct ust_app *app, uint64_t token) | |
3406 | { | |
3407 | int ret = 0; | |
3408 | struct ust_app_token_event_rule *ua_token; | |
3409 | ||
3410 | ua_token = alloc_ust_app_token_event_rule(rule, token); | |
3411 | if (ua_token == NULL) { | |
3412 | ret = -ENOMEM; | |
3413 | goto end; | |
3414 | } | |
3415 | ||
3416 | /* Create it on the tracer side */ | |
3417 | ret = create_ust_token_event_rule(app, ua_token); | |
3418 | if (ret < 0) { | |
3419 | /* | |
3420 | * Not found previously means that it does not exist on the | |
3421 | * tracer. If the application reports that the event existed, | |
3422 | * it means there is a bug in the sessiond or lttng-ust | |
3423 | * (or corruption, etc.) | |
3424 | */ | |
3425 | if (ret == -LTTNG_UST_ERR_EXIST) { | |
3426 | ERR("Tracer for application reported that a token event rule being created already existed: " | |
3427 | "token = \"%" PRIu64 "\", pid = %d, ppid = %d, uid = %d, gid = %d", | |
3428 | token, | |
3429 | app->pid, app->ppid, app->uid, | |
3430 | app->gid); | |
3431 | } | |
3432 | goto error; | |
3433 | } | |
3434 | ||
3435 | lttng_ht_add_unique_u64(app->tokens_ht, &ua_token->node); | |
3436 | ||
3437 | DBG2("UST app create token event rule %" PRIu64 " for PID %d completed", token, | |
3438 | app->pid); | |
3439 | ||
3440 | end: | |
3441 | return ret; | |
3442 | ||
3443 | error: | |
3444 | /* Valid. Calling here is already in a read side lock */ | |
3445 | delete_ust_app_token_event_rule(-1, ua_token, app); | |
3446 | return ret; | |
3447 | } | |
3448 | ||
5b4a0ec0 DG |
3449 | /* |
3450 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 3451 | * |
7972aab2 | 3452 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
3453 | */ |
3454 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
ad7a9107 | 3455 | struct ust_app *app, struct consumer_output *consumer) |
5b4a0ec0 DG |
3456 | { |
3457 | int ret = 0; | |
ffe60014 | 3458 | struct ust_app_channel *metadata; |
d88aee68 | 3459 | struct consumer_socket *socket; |
7972aab2 | 3460 | struct ust_registry_session *registry; |
e32d7f27 | 3461 | struct ltt_session *session = NULL; |
5b4a0ec0 | 3462 | |
ffe60014 DG |
3463 | assert(ua_sess); |
3464 | assert(app); | |
d88aee68 | 3465 | assert(consumer); |
5b4a0ec0 | 3466 | |
7972aab2 | 3467 | registry = get_session_registry(ua_sess); |
fad1ed2f | 3468 | /* The UST app session is held registry shall not be null. */ |
7972aab2 DG |
3469 | assert(registry); |
3470 | ||
ce34fcd0 MD |
3471 | pthread_mutex_lock(®istry->lock); |
3472 | ||
1b532a60 DG |
3473 | /* Metadata already exists for this registry or it was closed previously */ |
3474 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
3475 | ret = 0; |
3476 | goto error; | |
5b4a0ec0 DG |
3477 | } |
3478 | ||
ffe60014 | 3479 | /* Allocate UST metadata */ |
d0b96690 | 3480 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
3481 | if (!metadata) { |
3482 | /* malloc() failed */ | |
3483 | ret = -ENOMEM; | |
3484 | goto error; | |
3485 | } | |
5b4a0ec0 | 3486 | |
ad7a9107 | 3487 | memcpy(&metadata->attr, &ua_sess->metadata_attr, sizeof(metadata->attr)); |
5b4a0ec0 | 3488 | |
7972aab2 DG |
3489 | /* Need one fd for the channel. */ |
3490 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
3491 | if (ret < 0) { | |
3492 | ERR("Exhausted number of available FD upon create metadata"); | |
3493 | goto error; | |
3494 | } | |
3495 | ||
4dc3dfc5 DG |
3496 | /* Get the right consumer socket for the application. */ |
3497 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
3498 | if (!socket) { | |
3499 | ret = -EINVAL; | |
3500 | goto error_consumer; | |
3501 | } | |
3502 | ||
331744e3 JD |
3503 | /* |
3504 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
3505 | * to the registry *before* we ask the consumer so we avoid the race of the | |
3506 | * consumer requesting the metadata and the ask_channel call on our side | |
3507 | * did not returned yet. | |
3508 | */ | |
3509 | registry->metadata_key = metadata->key; | |
3510 | ||
e098433c JG |
3511 | session = session_find_by_id(ua_sess->tracing_id); |
3512 | assert(session); | |
3513 | ||
3514 | assert(pthread_mutex_trylock(&session->lock)); | |
3515 | assert(session_trylock_list()); | |
3516 | ||
d88aee68 DG |
3517 | /* |
3518 | * Ask the metadata channel creation to the consumer. The metadata object | |
3519 | * will be created by the consumer and kept their. However, the stream is | |
3520 | * never added or monitored until we do a first push metadata to the | |
3521 | * consumer. | |
3522 | */ | |
7972aab2 | 3523 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
d2956687 | 3524 | registry, session->current_trace_chunk); |
d88aee68 | 3525 | if (ret < 0) { |
f2a444f1 DG |
3526 | /* Nullify the metadata key so we don't try to close it later on. */ |
3527 | registry->metadata_key = 0; | |
d88aee68 DG |
3528 | goto error_consumer; |
3529 | } | |
3530 | ||
3531 | /* | |
3532 | * The setup command will make the metadata stream be sent to the relayd, | |
3533 | * if applicable, and the thread managing the metadatas. This is important | |
3534 | * because after this point, if an error occurs, the only way the stream | |
3535 | * can be deleted is to be monitored in the consumer. | |
3536 | */ | |
7972aab2 | 3537 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 3538 | if (ret < 0) { |
f2a444f1 DG |
3539 | /* Nullify the metadata key so we don't try to close it later on. */ |
3540 | registry->metadata_key = 0; | |
d88aee68 | 3541 | goto error_consumer; |
5b4a0ec0 DG |
3542 | } |
3543 | ||
7972aab2 DG |
3544 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
3545 | metadata->key, app->pid); | |
5b4a0ec0 | 3546 | |
d88aee68 | 3547 | error_consumer: |
b80f0b6c | 3548 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 3549 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 3550 | error: |
ce34fcd0 | 3551 | pthread_mutex_unlock(®istry->lock); |
e32d7f27 JG |
3552 | if (session) { |
3553 | session_put(session); | |
3554 | } | |
ffe60014 | 3555 | return ret; |
5b4a0ec0 DG |
3556 | } |
3557 | ||
5b4a0ec0 | 3558 | /* |
d88aee68 DG |
3559 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
3560 | * acquired before calling this function. | |
5b4a0ec0 DG |
3561 | */ |
3562 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
3563 | { | |
d88aee68 | 3564 | struct ust_app *app = NULL; |
bec39940 DG |
3565 | struct lttng_ht_node_ulong *node; |
3566 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 3567 | |
bec39940 DG |
3568 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
3569 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
3570 | if (node == NULL) { |
3571 | DBG2("UST app no found with pid %d", pid); | |
3572 | goto error; | |
3573 | } | |
5b4a0ec0 DG |
3574 | |
3575 | DBG2("Found UST app by pid %d", pid); | |
3576 | ||
d88aee68 | 3577 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
3578 | |
3579 | error: | |
d88aee68 | 3580 | return app; |
5b4a0ec0 DG |
3581 | } |
3582 | ||
d88aee68 DG |
3583 | /* |
3584 | * Allocate and init an UST app object using the registration information and | |
3585 | * the command socket. This is called when the command socket connects to the | |
3586 | * session daemon. | |
3587 | * | |
3588 | * The object is returned on success or else NULL. | |
3589 | */ | |
d0b96690 | 3590 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 3591 | { |
d0b96690 | 3592 | struct ust_app *lta = NULL; |
d3a684ee | 3593 | struct lttng_pipe *trigger_event_source_pipe = NULL; |
d0b96690 DG |
3594 | |
3595 | assert(msg); | |
3596 | assert(sock >= 0); | |
3597 | ||
3598 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 3599 | |
173af62f DG |
3600 | if ((msg->bits_per_long == 64 && |
3601 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
3602 | || (msg->bits_per_long == 32 && | |
3603 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 3604 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
3605 | "%d-bit long, but no consumerd for this size is available.\n", |
3606 | msg->name, msg->pid, msg->bits_per_long); | |
3607 | goto error; | |
3f2c5fcc | 3608 | } |
d0b96690 | 3609 | |
d3a684ee JR |
3610 | trigger_event_source_pipe = lttng_pipe_open(FD_CLOEXEC); |
3611 | if (!trigger_event_source_pipe) { | |
3612 | PERROR("Open trigger pipe"); | |
3613 | goto error; | |
3614 | } | |
3615 | ||
5b4a0ec0 DG |
3616 | lta = zmalloc(sizeof(struct ust_app)); |
3617 | if (lta == NULL) { | |
3618 | PERROR("malloc"); | |
d0b96690 | 3619 | goto error; |
5b4a0ec0 DG |
3620 | } |
3621 | ||
d3a684ee JR |
3622 | lta->token_communication.trigger_event_pipe = trigger_event_source_pipe; |
3623 | ||
5b4a0ec0 DG |
3624 | lta->ppid = msg->ppid; |
3625 | lta->uid = msg->uid; | |
3626 | lta->gid = msg->gid; | |
d0b96690 | 3627 | |
7753dea8 | 3628 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
3629 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
3630 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
3631 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
3632 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
3633 | lta->long_alignment = msg->long_alignment; | |
3634 | lta->byte_order = msg->byte_order; | |
3635 | ||
5b4a0ec0 DG |
3636 | lta->v_major = msg->major; |
3637 | lta->v_minor = msg->minor; | |
d9bf3ca4 | 3638 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 | 3639 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
10b56aef | 3640 | lta->ust_sessions_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3641 | lta->notify_sock = -1; |
d3a684ee | 3642 | lta->tokens_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d88aee68 DG |
3643 | |
3644 | /* Copy name and make sure it's NULL terminated. */ | |
3645 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
3646 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
3647 | ||
3648 | /* | |
3649 | * Before this can be called, when receiving the registration information, | |
3650 | * the application compatibility is checked. So, at this point, the | |
3651 | * application can work with this session daemon. | |
3652 | */ | |
d0b96690 | 3653 | lta->compatible = 1; |
5b4a0ec0 | 3654 | |
852d0037 | 3655 | lta->pid = msg->pid; |
d0b96690 | 3656 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 3657 | lta->sock = sock; |
fb45065e | 3658 | pthread_mutex_init(<a->sock_lock, NULL); |
d0b96690 | 3659 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 3660 | |
d42f20df | 3661 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
d0b96690 DG |
3662 | error: |
3663 | return lta; | |
3664 | } | |
3665 | ||
d88aee68 DG |
3666 | /* |
3667 | * For a given application object, add it to every hash table. | |
3668 | */ | |
d0b96690 DG |
3669 | void ust_app_add(struct ust_app *app) |
3670 | { | |
3671 | assert(app); | |
3672 | assert(app->notify_sock >= 0); | |
3673 | ||
940c4592 JR |
3674 | app->registration_time = time(NULL); |
3675 | ||
5b4a0ec0 | 3676 | rcu_read_lock(); |
852d0037 DG |
3677 | |
3678 | /* | |
3679 | * On a re-registration, we want to kick out the previous registration of | |
3680 | * that pid | |
3681 | */ | |
d0b96690 | 3682 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
3683 | |
3684 | /* | |
3685 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
3686 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
3687 | * already in the table. | |
3688 | */ | |
d0b96690 | 3689 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 3690 | |
d0b96690 DG |
3691 | /* Add application to the notify socket hash table. */ |
3692 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
3693 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 3694 | |
d0b96690 | 3695 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
3696 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
3697 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
3698 | app->v_minor); | |
5b4a0ec0 | 3699 | |
d0b96690 DG |
3700 | rcu_read_unlock(); |
3701 | } | |
3702 | ||
d88aee68 DG |
3703 | /* |
3704 | * Set the application version into the object. | |
3705 | * | |
3706 | * Return 0 on success else a negative value either an errno code or a | |
3707 | * LTTng-UST error code. | |
3708 | */ | |
d0b96690 DG |
3709 | int ust_app_version(struct ust_app *app) |
3710 | { | |
d88aee68 DG |
3711 | int ret; |
3712 | ||
d0b96690 | 3713 | assert(app); |
d88aee68 | 3714 | |
fb45065e | 3715 | pthread_mutex_lock(&app->sock_lock); |
d88aee68 | 3716 | ret = ustctl_tracer_version(app->sock, &app->version); |
fb45065e | 3717 | pthread_mutex_unlock(&app->sock_lock); |
d88aee68 DG |
3718 | if (ret < 0) { |
3719 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
5368d366 | 3720 | ERR("UST app %d version failed with ret %d", app->sock, ret); |
d88aee68 | 3721 | } else { |
5368d366 | 3722 | DBG3("UST app %d version failed. Application is dead", app->sock); |
d88aee68 DG |
3723 | } |
3724 | } | |
3725 | ||
3726 | return ret; | |
5b4a0ec0 DG |
3727 | } |
3728 | ||
d3a684ee JR |
3729 | /* |
3730 | * Setup the base trigger group. | |
3731 | * | |
3732 | * Return 0 on success else a negative value either an errno code or a | |
3733 | * LTTng-UST error code. | |
3734 | */ | |
3735 | int ust_app_setup_trigger_group(struct ust_app *app) | |
3736 | { | |
3737 | int ret; | |
3738 | int writefd; | |
3739 | struct lttng_ust_object_data *group = NULL; | |
3740 | enum lttng_error_code lttng_ret; | |
3741 | ||
3742 | assert(app); | |
3743 | ||
3744 | /* Get the write side of the pipe */ | |
3745 | writefd = lttng_pipe_get_writefd(app->token_communication.trigger_event_pipe); | |
3746 | ||
3747 | pthread_mutex_lock(&app->sock_lock); | |
3748 | ret = ustctl_create_trigger_group(app->sock, writefd, &group); | |
3749 | pthread_mutex_unlock(&app->sock_lock); | |
3750 | if (ret < 0) { | |
3751 | ERR("UST app %d create_trigger_group failed with ret %d", app->sock, ret); | |
3752 | goto end; | |
3753 | } | |
3754 | ||
3755 | app->token_communication.handle = group; | |
3756 | ||
3757 | lttng_ret = notification_thread_command_add_application( | |
3758 | notification_thread_handle, app->token_communication.trigger_event_pipe); | |
3759 | if (lttng_ret != LTTNG_OK) { | |
3760 | /* TODO: error */ | |
3761 | ret = - 1; | |
3762 | ERR("Failed to add channel to notification thread"); | |
3763 | goto end; | |
3764 | } | |
3765 | ||
3766 | end: | |
3767 | return ret; | |
3768 | } | |
3769 | ||
5b4a0ec0 DG |
3770 | /* |
3771 | * Unregister app by removing it from the global traceable app list and freeing | |
3772 | * the data struct. | |
3773 | * | |
3774 | * The socket is already closed at this point so no close to sock. | |
3775 | */ | |
3776 | void ust_app_unregister(int sock) | |
3777 | { | |
d3a684ee | 3778 | enum lttng_error_code ret_code; |
5b4a0ec0 | 3779 | struct ust_app *lta; |
bec39940 | 3780 | struct lttng_ht_node_ulong *node; |
c4b88406 | 3781 | struct lttng_ht_iter ust_app_sock_iter; |
bec39940 | 3782 | struct lttng_ht_iter iter; |
d42f20df | 3783 | struct ust_app_session *ua_sess; |
525b0740 | 3784 | int ret; |
5b4a0ec0 DG |
3785 | |
3786 | rcu_read_lock(); | |
886459c6 | 3787 | |
5b4a0ec0 | 3788 | /* Get the node reference for a call_rcu */ |
c4b88406 MD |
3789 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &ust_app_sock_iter); |
3790 | node = lttng_ht_iter_get_node_ulong(&ust_app_sock_iter); | |
d0b96690 | 3791 | assert(node); |
284d8f55 | 3792 | |
852d0037 | 3793 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
3794 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
3795 | ||
d88aee68 | 3796 | /* |
ce34fcd0 MD |
3797 | * For per-PID buffers, perform "push metadata" and flush all |
3798 | * application streams before removing app from hash tables, | |
3799 | * ensuring proper behavior of data_pending check. | |
c4b88406 | 3800 | * Remove sessions so they are not visible during deletion. |
d88aee68 | 3801 | */ |
d42f20df DG |
3802 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, |
3803 | node.node) { | |
7972aab2 DG |
3804 | struct ust_registry_session *registry; |
3805 | ||
d42f20df DG |
3806 | ret = lttng_ht_del(lta->sessions, &iter); |
3807 | if (ret) { | |
3808 | /* The session was already removed so scheduled for teardown. */ | |
3809 | continue; | |
3810 | } | |
3811 | ||
ce34fcd0 MD |
3812 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { |
3813 | (void) ust_app_flush_app_session(lta, ua_sess); | |
3814 | } | |
c4b88406 | 3815 | |
d42f20df DG |
3816 | /* |
3817 | * Add session to list for teardown. This is safe since at this point we | |
3818 | * are the only one using this list. | |
3819 | */ | |
d88aee68 DG |
3820 | pthread_mutex_lock(&ua_sess->lock); |
3821 | ||
b161602a MD |
3822 | if (ua_sess->deleted) { |
3823 | pthread_mutex_unlock(&ua_sess->lock); | |
3824 | continue; | |
3825 | } | |
3826 | ||
d88aee68 DG |
3827 | /* |
3828 | * Normally, this is done in the delete session process which is | |
3829 | * executed in the call rcu below. However, upon registration we can't | |
3830 | * afford to wait for the grace period before pushing data or else the | |
3831 | * data pending feature can race between the unregistration and stop | |
3832 | * command where the data pending command is sent *before* the grace | |
3833 | * period ended. | |
3834 | * | |
3835 | * The close metadata below nullifies the metadata pointer in the | |
3836 | * session so the delete session will NOT push/close a second time. | |
3837 | */ | |
7972aab2 | 3838 | registry = get_session_registry(ua_sess); |
ce34fcd0 | 3839 | if (registry) { |
7972aab2 DG |
3840 | /* Push metadata for application before freeing the application. */ |
3841 | (void) push_metadata(registry, ua_sess->consumer); | |
3842 | ||
3843 | /* | |
3844 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
3845 | * metadata only on destroy trace session in this case. Also, the |
3846 | * previous push metadata could have flag the metadata registry to | |
3847 | * close so don't send a close command if closed. | |
7972aab2 | 3848 | */ |
ce34fcd0 | 3849 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
3850 | /* And ask to close it for this session registry. */ |
3851 | (void) close_metadata(registry, ua_sess->consumer); | |
3852 | } | |
3853 | } | |
d42f20df | 3854 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
c4b88406 | 3855 | |
d88aee68 | 3856 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
3857 | } |
3858 | ||
c4b88406 MD |
3859 | /* Remove application from PID hash table */ |
3860 | ret = lttng_ht_del(ust_app_ht_by_sock, &ust_app_sock_iter); | |
3861 | assert(!ret); | |
3862 | ||
3863 | /* | |
3864 | * Remove application from notify hash table. The thread handling the | |
3865 | * notify socket could have deleted the node so ignore on error because | |
c48239ca JG |
3866 | * either way it's valid. The close of that socket is handled by the |
3867 | * apps_notify_thread. | |
c4b88406 MD |
3868 | */ |
3869 | iter.iter.node = <a->notify_sock_n.node; | |
3870 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3871 | ||
3872 | /* | |
3873 | * Ignore return value since the node might have been removed before by an | |
3874 | * add replace during app registration because the PID can be reassigned by | |
3875 | * the OS. | |
3876 | */ | |
3877 | iter.iter.node = <a->pid_n.node; | |
3878 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3879 | if (ret) { | |
3880 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
3881 | lta->pid); | |
3882 | } | |
3883 | ||
d3a684ee JR |
3884 | ret_code = notification_thread_command_remove_application( |
3885 | notification_thread_handle, | |
3886 | lta->token_communication.trigger_event_pipe); | |
3887 | if (ret_code != LTTNG_OK) { | |
3888 | ERR("Failed to remove application from notification thread"); | |
3889 | } | |
3890 | ||
852d0037 DG |
3891 | /* Free memory */ |
3892 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
3893 | ||
5b4a0ec0 DG |
3894 | rcu_read_unlock(); |
3895 | return; | |
284d8f55 DG |
3896 | } |
3897 | ||
5b4a0ec0 DG |
3898 | /* |
3899 | * Fill events array with all events name of all registered apps. | |
3900 | */ | |
3901 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 3902 | { |
5b4a0ec0 DG |
3903 | int ret, handle; |
3904 | size_t nbmem, count = 0; | |
bec39940 | 3905 | struct lttng_ht_iter iter; |
5b4a0ec0 | 3906 | struct ust_app *app; |
c617c0c6 | 3907 | struct lttng_event *tmp_event; |
421cb601 | 3908 | |
5b4a0ec0 | 3909 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
3910 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
3911 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
3912 | PERROR("zmalloc ust app events"); |
3913 | ret = -ENOMEM; | |
421cb601 DG |
3914 | goto error; |
3915 | } | |
3916 | ||
5b4a0ec0 | 3917 | rcu_read_lock(); |
421cb601 | 3918 | |
852d0037 | 3919 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 3920 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 3921 | |
840cb59c | 3922 | health_code_update(); |
86acf0da | 3923 | |
e0c7ec2b DG |
3924 | if (!app->compatible) { |
3925 | /* | |
3926 | * TODO: In time, we should notice the caller of this error by | |
3927 | * telling him that this is a version error. | |
3928 | */ | |
3929 | continue; | |
3930 | } | |
fb45065e | 3931 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 3932 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 3933 | if (handle < 0) { |
ffe60014 DG |
3934 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3935 | ERR("UST app list events getting handle failed for app pid %d", | |
3936 | app->pid); | |
3937 | } | |
fb45065e | 3938 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 DG |
3939 | continue; |
3940 | } | |
421cb601 | 3941 | |
852d0037 | 3942 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 3943 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3944 | /* Handle ustctl error. */ |
3945 | if (ret < 0) { | |
fb45065e MD |
3946 | int release_ret; |
3947 | ||
a2ba1ab0 | 3948 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3949 | ERR("UST app tp list get failed for app %d with ret %d", |
3950 | app->sock, ret); | |
3951 | } else { | |
3952 | DBG3("UST app tp list get failed. Application is dead"); | |
3757b385 DG |
3953 | /* |
3954 | * This is normal behavior, an application can die during the | |
3955 | * creation process. Don't report an error so the execution can | |
3956 | * continue normally. Continue normal execution. | |
3957 | */ | |
3958 | break; | |
ffe60014 | 3959 | } |
98f595d4 | 3960 | free(tmp_event); |
fb45065e | 3961 | release_ret = ustctl_release_handle(app->sock, handle); |
68313703 JG |
3962 | if (release_ret < 0 && |
3963 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3964 | release_ret != -EPIPE) { | |
fb45065e MD |
3965 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3966 | } | |
3967 | pthread_mutex_unlock(&app->sock_lock); | |
ffe60014 DG |
3968 | goto rcu_error; |
3969 | } | |
3970 | ||
840cb59c | 3971 | health_code_update(); |
815564d8 | 3972 | if (count >= nbmem) { |
d7b3776f | 3973 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3974 | struct lttng_event *new_tmp_event; |
3975 | size_t new_nbmem; | |
3976 | ||
3977 | new_nbmem = nbmem << 1; | |
3978 | DBG2("Reallocating event list from %zu to %zu entries", | |
3979 | nbmem, new_nbmem); | |
3980 | new_tmp_event = realloc(tmp_event, | |
3981 | new_nbmem * sizeof(struct lttng_event)); | |
3982 | if (new_tmp_event == NULL) { | |
fb45065e MD |
3983 | int release_ret; |
3984 | ||
5b4a0ec0 | 3985 | PERROR("realloc ust app events"); |
c617c0c6 | 3986 | free(tmp_event); |
5b4a0ec0 | 3987 | ret = -ENOMEM; |
fb45065e | 3988 | release_ret = ustctl_release_handle(app->sock, handle); |
68313703 JG |
3989 | if (release_ret < 0 && |
3990 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3991 | release_ret != -EPIPE) { | |
fb45065e MD |
3992 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3993 | } | |
3994 | pthread_mutex_unlock(&app->sock_lock); | |
5b4a0ec0 DG |
3995 | goto rcu_error; |
3996 | } | |
53efb85a MD |
3997 | /* Zero the new memory */ |
3998 | memset(new_tmp_event + nbmem, 0, | |
3999 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
4000 | nbmem = new_nbmem; | |
4001 | tmp_event = new_tmp_event; | |
5b4a0ec0 | 4002 | } |
c617c0c6 MD |
4003 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
4004 | tmp_event[count].loglevel = uiter.loglevel; | |
4005 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
4006 | tmp_event[count].pid = app->pid; | |
4007 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 4008 | count++; |
421cb601 | 4009 | } |
fb45065e MD |
4010 | ret = ustctl_release_handle(app->sock, handle); |
4011 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 | 4012 | if (ret < 0 && ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
fb45065e MD |
4013 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
4014 | } | |
421cb601 DG |
4015 | } |
4016 | ||
5b4a0ec0 | 4017 | ret = count; |
c617c0c6 | 4018 | *events = tmp_event; |
421cb601 | 4019 | |
5b4a0ec0 | 4020 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 4021 | |
5b4a0ec0 DG |
4022 | rcu_error: |
4023 | rcu_read_unlock(); | |
421cb601 | 4024 | error: |
840cb59c | 4025 | health_code_update(); |
5b4a0ec0 | 4026 | return ret; |
421cb601 DG |
4027 | } |
4028 | ||
f37d259d MD |
4029 | /* |
4030 | * Fill events array with all events name of all registered apps. | |
4031 | */ | |
4032 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
4033 | { | |
4034 | int ret, handle; | |
4035 | size_t nbmem, count = 0; | |
4036 | struct lttng_ht_iter iter; | |
4037 | struct ust_app *app; | |
c617c0c6 | 4038 | struct lttng_event_field *tmp_event; |
f37d259d MD |
4039 | |
4040 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
4041 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
4042 | if (tmp_event == NULL) { | |
f37d259d MD |
4043 | PERROR("zmalloc ust app event fields"); |
4044 | ret = -ENOMEM; | |
4045 | goto error; | |
4046 | } | |
4047 | ||
4048 | rcu_read_lock(); | |
4049 | ||
4050 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4051 | struct lttng_ust_field_iter uiter; | |
4052 | ||
840cb59c | 4053 | health_code_update(); |
86acf0da | 4054 | |
f37d259d MD |
4055 | if (!app->compatible) { |
4056 | /* | |
4057 | * TODO: In time, we should notice the caller of this error by | |
4058 | * telling him that this is a version error. | |
4059 | */ | |
4060 | continue; | |
4061 | } | |
fb45065e | 4062 | pthread_mutex_lock(&app->sock_lock); |
f37d259d MD |
4063 | handle = ustctl_tracepoint_field_list(app->sock); |
4064 | if (handle < 0) { | |
ffe60014 DG |
4065 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
4066 | ERR("UST app list field getting handle failed for app pid %d", | |
4067 | app->pid); | |
4068 | } | |
fb45065e | 4069 | pthread_mutex_unlock(&app->sock_lock); |
f37d259d MD |
4070 | continue; |
4071 | } | |
4072 | ||
4073 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 4074 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
4075 | /* Handle ustctl error. */ |
4076 | if (ret < 0) { | |
fb45065e MD |
4077 | int release_ret; |
4078 | ||
a2ba1ab0 | 4079 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
4080 | ERR("UST app tp list field failed for app %d with ret %d", |
4081 | app->sock, ret); | |
4082 | } else { | |
4083 | DBG3("UST app tp list field failed. Application is dead"); | |
3757b385 DG |
4084 | /* |
4085 | * This is normal behavior, an application can die during the | |
4086 | * creation process. Don't report an error so the execution can | |
98f595d4 | 4087 | * continue normally. Reset list and count for next app. |
3757b385 DG |
4088 | */ |
4089 | break; | |
ffe60014 | 4090 | } |
98f595d4 | 4091 | free(tmp_event); |
fb45065e MD |
4092 | release_ret = ustctl_release_handle(app->sock, handle); |
4093 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
4094 | if (release_ret < 0 && |
4095 | release_ret != -LTTNG_UST_ERR_EXITING && | |
4096 | release_ret != -EPIPE) { | |
fb45065e MD |
4097 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
4098 | } | |
ffe60014 DG |
4099 | goto rcu_error; |
4100 | } | |
4101 | ||
840cb59c | 4102 | health_code_update(); |
f37d259d | 4103 | if (count >= nbmem) { |
d7b3776f | 4104 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
4105 | struct lttng_event_field *new_tmp_event; |
4106 | size_t new_nbmem; | |
4107 | ||
4108 | new_nbmem = nbmem << 1; | |
4109 | DBG2("Reallocating event field list from %zu to %zu entries", | |
4110 | nbmem, new_nbmem); | |
4111 | new_tmp_event = realloc(tmp_event, | |
4112 | new_nbmem * sizeof(struct lttng_event_field)); | |
4113 | if (new_tmp_event == NULL) { | |
fb45065e MD |
4114 | int release_ret; |
4115 | ||
f37d259d | 4116 | PERROR("realloc ust app event fields"); |
c617c0c6 | 4117 | free(tmp_event); |
f37d259d | 4118 | ret = -ENOMEM; |
fb45065e MD |
4119 | release_ret = ustctl_release_handle(app->sock, handle); |
4120 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
4121 | if (release_ret && |
4122 | release_ret != -LTTNG_UST_ERR_EXITING && | |
4123 | release_ret != -EPIPE) { | |
fb45065e MD |
4124 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
4125 | } | |
f37d259d MD |
4126 | goto rcu_error; |
4127 | } | |
53efb85a MD |
4128 | /* Zero the new memory */ |
4129 | memset(new_tmp_event + nbmem, 0, | |
4130 | (new_nbmem - nbmem) * sizeof(struct lttng_event_field)); | |
4131 | nbmem = new_nbmem; | |
4132 | tmp_event = new_tmp_event; | |
f37d259d | 4133 | } |
f37d259d | 4134 | |
c617c0c6 | 4135 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
2e84128e DG |
4136 | /* Mapping between these enums matches 1 to 1. */ |
4137 | tmp_event[count].type = (enum lttng_event_field_type) uiter.type; | |
c617c0c6 | 4138 | tmp_event[count].nowrite = uiter.nowrite; |
f37d259d | 4139 | |
c617c0c6 MD |
4140 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
4141 | tmp_event[count].event.loglevel = uiter.loglevel; | |
2e84128e | 4142 | tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; |
c617c0c6 MD |
4143 | tmp_event[count].event.pid = app->pid; |
4144 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
4145 | count++; |
4146 | } | |
fb45065e MD |
4147 | ret = ustctl_release_handle(app->sock, handle); |
4148 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
4149 | if (ret < 0 && |
4150 | ret != -LTTNG_UST_ERR_EXITING && | |
4151 | ret != -EPIPE) { | |
fb45065e MD |
4152 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
4153 | } | |
f37d259d MD |
4154 | } |
4155 | ||
4156 | ret = count; | |
c617c0c6 | 4157 | *fields = tmp_event; |
f37d259d MD |
4158 | |
4159 | DBG2("UST app list event fields done (%zu events)", count); | |
4160 | ||
4161 | rcu_error: | |
4162 | rcu_read_unlock(); | |
4163 | error: | |
840cb59c | 4164 | health_code_update(); |
f37d259d MD |
4165 | return ret; |
4166 | } | |
4167 | ||
5b4a0ec0 DG |
4168 | /* |
4169 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
4170 | * |
4171 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
4172 | */ |
4173 | void ust_app_clean_list(void) | |
421cb601 | 4174 | { |
5b4a0ec0 | 4175 | int ret; |
659ed79f | 4176 | struct ust_app *app; |
bec39940 | 4177 | struct lttng_ht_iter iter; |
421cb601 | 4178 | |
5b4a0ec0 | 4179 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 4180 | |
5b4a0ec0 | 4181 | rcu_read_lock(); |
421cb601 | 4182 | |
faadaa3a JG |
4183 | /* Cleanup notify socket hash table */ |
4184 | if (ust_app_ht_by_notify_sock) { | |
4185 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
4186 | notify_sock_n.node) { | |
4187 | struct cds_lfht_node *node; | |
4188 | struct ust_app *app; | |
4189 | ||
4190 | node = cds_lfht_iter_get_node(&iter.iter); | |
4191 | if (!node) { | |
4192 | continue; | |
4193 | } | |
4194 | ||
4195 | app = container_of(node, struct ust_app, | |
4196 | notify_sock_n.node); | |
4197 | ust_app_notify_sock_unregister(app->notify_sock); | |
4198 | } | |
4199 | } | |
4200 | ||
f1b711c4 MD |
4201 | if (ust_app_ht) { |
4202 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4203 | ret = lttng_ht_del(ust_app_ht, &iter); | |
4204 | assert(!ret); | |
4205 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
4206 | } | |
421cb601 DG |
4207 | } |
4208 | ||
852d0037 | 4209 | /* Cleanup socket hash table */ |
f1b711c4 MD |
4210 | if (ust_app_ht_by_sock) { |
4211 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, | |
4212 | sock_n.node) { | |
4213 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); | |
4214 | assert(!ret); | |
4215 | } | |
bec39940 | 4216 | } |
852d0037 | 4217 | |
36b588ed | 4218 | rcu_read_unlock(); |
d88aee68 | 4219 | |
bec39940 | 4220 | /* Destroy is done only when the ht is empty */ |
f1b711c4 MD |
4221 | if (ust_app_ht) { |
4222 | ht_cleanup_push(ust_app_ht); | |
4223 | } | |
4224 | if (ust_app_ht_by_sock) { | |
4225 | ht_cleanup_push(ust_app_ht_by_sock); | |
4226 | } | |
4227 | if (ust_app_ht_by_notify_sock) { | |
4228 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
4229 | } | |
5b4a0ec0 DG |
4230 | } |
4231 | ||
4232 | /* | |
4233 | * Init UST app hash table. | |
4234 | */ | |
57703f6e | 4235 | int ust_app_ht_alloc(void) |
5b4a0ec0 | 4236 | { |
bec39940 | 4237 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
4238 | if (!ust_app_ht) { |
4239 | return -1; | |
4240 | } | |
852d0037 | 4241 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
4242 | if (!ust_app_ht_by_sock) { |
4243 | return -1; | |
4244 | } | |
d0b96690 | 4245 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
4246 | if (!ust_app_ht_by_notify_sock) { |
4247 | return -1; | |
4248 | } | |
4249 | return 0; | |
421cb601 DG |
4250 | } |
4251 | ||
78f0bacd DG |
4252 | /* |
4253 | * For a specific UST session, disable the channel for all registered apps. | |
4254 | */ | |
35a9059d | 4255 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
4256 | struct ltt_ust_channel *uchan) |
4257 | { | |
4258 | int ret = 0; | |
bec39940 DG |
4259 | struct lttng_ht_iter iter; |
4260 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
4261 | struct ust_app *app; |
4262 | struct ust_app_session *ua_sess; | |
8535a6d9 | 4263 | struct ust_app_channel *ua_chan; |
78f0bacd | 4264 | |
88e3c2f5 | 4265 | assert(usess->active); |
d9bf3ca4 | 4266 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 4267 | uchan->name, usess->id); |
78f0bacd DG |
4268 | |
4269 | rcu_read_lock(); | |
4270 | ||
4271 | /* For every registered applications */ | |
852d0037 | 4272 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 4273 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
4274 | if (!app->compatible) { |
4275 | /* | |
4276 | * TODO: In time, we should notice the caller of this error by | |
4277 | * telling him that this is a version error. | |
4278 | */ | |
4279 | continue; | |
4280 | } | |
78f0bacd DG |
4281 | ua_sess = lookup_session_by_app(usess, app); |
4282 | if (ua_sess == NULL) { | |
4283 | continue; | |
4284 | } | |
4285 | ||
8535a6d9 | 4286 | /* Get channel */ |
bec39940 DG |
4287 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4288 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
4289 | /* If the session if found for the app, the channel must be there */ |
4290 | assert(ua_chan_node); | |
4291 | ||
4292 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4293 | /* The channel must not be already disabled */ | |
4294 | assert(ua_chan->enabled == 1); | |
4295 | ||
4296 | /* Disable channel onto application */ | |
4297 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
4298 | if (ret < 0) { |
4299 | /* XXX: We might want to report this error at some point... */ | |
4300 | continue; | |
4301 | } | |
4302 | } | |
4303 | ||
4304 | rcu_read_unlock(); | |
78f0bacd DG |
4305 | return ret; |
4306 | } | |
4307 | ||
4308 | /* | |
4309 | * For a specific UST session, enable the channel for all registered apps. | |
4310 | */ | |
35a9059d | 4311 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
4312 | struct ltt_ust_channel *uchan) |
4313 | { | |
4314 | int ret = 0; | |
bec39940 | 4315 | struct lttng_ht_iter iter; |
78f0bacd DG |
4316 | struct ust_app *app; |
4317 | struct ust_app_session *ua_sess; | |
4318 | ||
88e3c2f5 | 4319 | assert(usess->active); |
d9bf3ca4 | 4320 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 4321 | uchan->name, usess->id); |
78f0bacd DG |
4322 | |
4323 | rcu_read_lock(); | |
4324 | ||
4325 | /* For every registered applications */ | |
852d0037 | 4326 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4327 | if (!app->compatible) { |
4328 | /* | |
4329 | * TODO: In time, we should notice the caller of this error by | |
4330 | * telling him that this is a version error. | |
4331 | */ | |
4332 | continue; | |
4333 | } | |
78f0bacd DG |
4334 | ua_sess = lookup_session_by_app(usess, app); |
4335 | if (ua_sess == NULL) { | |
4336 | continue; | |
4337 | } | |
4338 | ||
4339 | /* Enable channel onto application */ | |
4340 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
4341 | if (ret < 0) { | |
4342 | /* XXX: We might want to report this error at some point... */ | |
4343 | continue; | |
4344 | } | |
4345 | } | |
4346 | ||
4347 | rcu_read_unlock(); | |
78f0bacd DG |
4348 | return ret; |
4349 | } | |
4350 | ||
b0a40d28 DG |
4351 | /* |
4352 | * Disable an event in a channel and for a specific session. | |
4353 | */ | |
35a9059d DG |
4354 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
4355 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
4356 | { |
4357 | int ret = 0; | |
bec39940 | 4358 | struct lttng_ht_iter iter, uiter; |
700c5a9d | 4359 | struct lttng_ht_node_str *ua_chan_node; |
b0a40d28 DG |
4360 | struct ust_app *app; |
4361 | struct ust_app_session *ua_sess; | |
4362 | struct ust_app_channel *ua_chan; | |
4363 | struct ust_app_event *ua_event; | |
4364 | ||
88e3c2f5 | 4365 | assert(usess->active); |
b0a40d28 | 4366 | DBG("UST app disabling event %s for all apps in channel " |
d9bf3ca4 MD |
4367 | "%s for session id %" PRIu64, |
4368 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
4369 | |
4370 | rcu_read_lock(); | |
4371 | ||
4372 | /* For all registered applications */ | |
852d0037 | 4373 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4374 | if (!app->compatible) { |
4375 | /* | |
4376 | * TODO: In time, we should notice the caller of this error by | |
4377 | * telling him that this is a version error. | |
4378 | */ | |
4379 | continue; | |
4380 | } | |
b0a40d28 DG |
4381 | ua_sess = lookup_session_by_app(usess, app); |
4382 | if (ua_sess == NULL) { | |
4383 | /* Next app */ | |
4384 | continue; | |
4385 | } | |
4386 | ||
4387 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
4388 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4389 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 4390 | if (ua_chan_node == NULL) { |
d9bf3ca4 | 4391 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 4392 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
4393 | continue; |
4394 | } | |
4395 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4396 | ||
700c5a9d JR |
4397 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
4398 | uevent->filter, uevent->attr.loglevel, | |
4399 | uevent->exclusion); | |
4400 | if (ua_event == NULL) { | |
b0a40d28 | 4401 | DBG2("Event %s not found in channel %s for app pid %d." |
852d0037 | 4402 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
4403 | continue; |
4404 | } | |
b0a40d28 | 4405 | |
7f79d3a1 | 4406 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
4407 | if (ret < 0) { |
4408 | /* XXX: Report error someday... */ | |
4409 | continue; | |
4410 | } | |
4411 | } | |
4412 | ||
4413 | rcu_read_unlock(); | |
88e3c2f5 JG |
4414 | return ret; |
4415 | } | |
4416 | ||
4417 | /* The ua_sess lock must be held by the caller. */ | |
4418 | static | |
4419 | int ust_app_channel_create(struct ltt_ust_session *usess, | |
4420 | struct ust_app_session *ua_sess, | |
4421 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
4422 | struct ust_app_channel **_ua_chan) | |
4423 | { | |
4424 | int ret = 0; | |
4425 | struct ust_app_channel *ua_chan = NULL; | |
4426 | ||
4427 | assert(ua_sess); | |
4428 | ASSERT_LOCKED(ua_sess->lock); | |
4429 | ||
4430 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, | |
4431 | sizeof(uchan->name))) { | |
4432 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, | |
4433 | &uchan->attr); | |
4434 | ret = 0; | |
4435 | } else { | |
4436 | struct ltt_ust_context *uctx = NULL; | |
4437 | ||
4438 | /* | |
4439 | * Create channel onto application and synchronize its | |
4440 | * configuration. | |
4441 | */ | |
4442 | ret = ust_app_channel_allocate(ua_sess, uchan, | |
4443 | LTTNG_UST_CHAN_PER_CPU, usess, | |
4444 | &ua_chan); | |
4445 | if (ret == 0) { | |
4446 | ret = ust_app_channel_send(app, usess, | |
4447 | ua_sess, ua_chan); | |
4448 | } else { | |
4449 | goto end; | |
4450 | } | |
4451 | ||
4452 | /* Add contexts. */ | |
4453 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { | |
4454 | ret = create_ust_app_channel_context(ua_chan, | |
4455 | &uctx->ctx, app); | |
4456 | if (ret) { | |
4457 | goto end; | |
4458 | } | |
4459 | } | |
4460 | } | |
4461 | if (ret < 0) { | |
4462 | switch (ret) { | |
4463 | case -ENOTCONN: | |
4464 | /* | |
4465 | * The application's socket is not valid. Either a bad socket | |
4466 | * or a timeout on it. We can't inform the caller that for a | |
4467 | * specific app, the session failed so lets continue here. | |
4468 | */ | |
4469 | ret = 0; /* Not an error. */ | |
4470 | break; | |
4471 | case -ENOMEM: | |
4472 | default: | |
4473 | break; | |
4474 | } | |
4475 | } | |
0498a00c | 4476 | end: |
88e3c2f5 JG |
4477 | if (ret == 0 && _ua_chan) { |
4478 | /* | |
4479 | * Only return the application's channel on success. Note | |
4480 | * that the channel can still be part of the application's | |
4481 | * channel hashtable on error. | |
4482 | */ | |
4483 | *_ua_chan = ua_chan; | |
4484 | } | |
b0a40d28 DG |
4485 | return ret; |
4486 | } | |
4487 | ||
5b4a0ec0 | 4488 | /* |
edb67388 | 4489 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 4490 | */ |
35a9059d | 4491 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
4492 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4493 | { | |
4494 | int ret = 0; | |
bec39940 | 4495 | struct lttng_ht_iter iter, uiter; |
18eace3b | 4496 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
4497 | struct ust_app *app; |
4498 | struct ust_app_session *ua_sess; | |
4499 | struct ust_app_channel *ua_chan; | |
4500 | struct ust_app_event *ua_event; | |
48842b30 | 4501 | |
88e3c2f5 | 4502 | assert(usess->active); |
d9bf3ca4 | 4503 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 4504 | uevent->attr.name, usess->id); |
48842b30 | 4505 | |
edb67388 DG |
4506 | /* |
4507 | * NOTE: At this point, this function is called only if the session and | |
4508 | * channel passed are already created for all apps. and enabled on the | |
4509 | * tracer also. | |
4510 | */ | |
4511 | ||
48842b30 | 4512 | rcu_read_lock(); |
421cb601 DG |
4513 | |
4514 | /* For all registered applications */ | |
852d0037 | 4515 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4516 | if (!app->compatible) { |
4517 | /* | |
4518 | * TODO: In time, we should notice the caller of this error by | |
4519 | * telling him that this is a version error. | |
4520 | */ | |
4521 | continue; | |
4522 | } | |
edb67388 | 4523 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4524 | if (!ua_sess) { |
4525 | /* The application has problem or is probably dead. */ | |
4526 | continue; | |
4527 | } | |
ba767faf | 4528 | |
d0b96690 DG |
4529 | pthread_mutex_lock(&ua_sess->lock); |
4530 | ||
b161602a MD |
4531 | if (ua_sess->deleted) { |
4532 | pthread_mutex_unlock(&ua_sess->lock); | |
4533 | continue; | |
4534 | } | |
4535 | ||
edb67388 | 4536 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4537 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4538 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
a7169585 MD |
4539 | /* |
4540 | * It is possible that the channel cannot be found is | |
4541 | * the channel/event creation occurs concurrently with | |
4542 | * an application exit. | |
4543 | */ | |
4544 | if (!ua_chan_node) { | |
4545 | pthread_mutex_unlock(&ua_sess->lock); | |
4546 | continue; | |
4547 | } | |
edb67388 DG |
4548 | |
4549 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4550 | ||
18eace3b DG |
4551 | /* Get event node */ |
4552 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
39c5a3a7 | 4553 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 4554 | if (ua_event == NULL) { |
7f79d3a1 | 4555 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 4556 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 4557 | goto next_app; |
35a9059d | 4558 | } |
35a9059d DG |
4559 | |
4560 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
4561 | if (ret < 0) { | |
d0b96690 | 4562 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 4563 | goto error; |
48842b30 | 4564 | } |
d0b96690 DG |
4565 | next_app: |
4566 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
4567 | } |
4568 | ||
7f79d3a1 | 4569 | error: |
edb67388 | 4570 | rcu_read_unlock(); |
edb67388 DG |
4571 | return ret; |
4572 | } | |
4573 | ||
4574 | /* | |
4575 | * For a specific existing UST session and UST channel, creates the event for | |
4576 | * all registered apps. | |
4577 | */ | |
35a9059d | 4578 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
4579 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4580 | { | |
4581 | int ret = 0; | |
bec39940 DG |
4582 | struct lttng_ht_iter iter, uiter; |
4583 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
4584 | struct ust_app *app; |
4585 | struct ust_app_session *ua_sess; | |
4586 | struct ust_app_channel *ua_chan; | |
4587 | ||
88e3c2f5 | 4588 | assert(usess->active); |
d9bf3ca4 | 4589 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 4590 | uevent->attr.name, usess->id); |
edb67388 | 4591 | |
edb67388 DG |
4592 | rcu_read_lock(); |
4593 | ||
4594 | /* For all registered applications */ | |
852d0037 | 4595 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4596 | if (!app->compatible) { |
4597 | /* | |
4598 | * TODO: In time, we should notice the caller of this error by | |
4599 | * telling him that this is a version error. | |
4600 | */ | |
4601 | continue; | |
4602 | } | |
edb67388 | 4603 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4604 | if (!ua_sess) { |
4605 | /* The application has problem or is probably dead. */ | |
4606 | continue; | |
4607 | } | |
48842b30 | 4608 | |
d0b96690 | 4609 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
4610 | |
4611 | if (ua_sess->deleted) { | |
4612 | pthread_mutex_unlock(&ua_sess->lock); | |
4613 | continue; | |
4614 | } | |
4615 | ||
48842b30 | 4616 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4617 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4618 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
4619 | /* If the channel is not found, there is a code flow error */ |
4620 | assert(ua_chan_node); | |
4621 | ||
48842b30 DG |
4622 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
4623 | ||
edb67388 | 4624 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 4625 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 4626 | if (ret < 0) { |
49c336c1 | 4627 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
4628 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
4629 | break; | |
4630 | } | |
4631 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 4632 | uevent->attr.name, app->pid); |
5b4a0ec0 | 4633 | continue; |
48842b30 | 4634 | } |
48842b30 | 4635 | } |
5b4a0ec0 | 4636 | |
48842b30 | 4637 | rcu_read_unlock(); |
48842b30 DG |
4638 | return ret; |
4639 | } | |
4640 | ||
5b4a0ec0 DG |
4641 | /* |
4642 | * Start tracing for a specific UST session and app. | |
fad1ed2f JR |
4643 | * |
4644 | * Called with UST app session lock held. | |
4645 | * | |
5b4a0ec0 | 4646 | */ |
b34cbebf | 4647 | static |
421cb601 | 4648 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
4649 | { |
4650 | int ret = 0; | |
48842b30 | 4651 | struct ust_app_session *ua_sess; |
48842b30 | 4652 | |
852d0037 | 4653 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 4654 | |
509cbaf8 MD |
4655 | rcu_read_lock(); |
4656 | ||
e0c7ec2b DG |
4657 | if (!app->compatible) { |
4658 | goto end; | |
4659 | } | |
4660 | ||
421cb601 DG |
4661 | ua_sess = lookup_session_by_app(usess, app); |
4662 | if (ua_sess == NULL) { | |
d42f20df DG |
4663 | /* The session is in teardown process. Ignore and continue. */ |
4664 | goto end; | |
421cb601 | 4665 | } |
48842b30 | 4666 | |
d0b96690 DG |
4667 | pthread_mutex_lock(&ua_sess->lock); |
4668 | ||
b161602a MD |
4669 | if (ua_sess->deleted) { |
4670 | pthread_mutex_unlock(&ua_sess->lock); | |
4671 | goto end; | |
4672 | } | |
4673 | ||
b0a1c741 JR |
4674 | if (ua_sess->enabled) { |
4675 | pthread_mutex_unlock(&ua_sess->lock); | |
4676 | goto end; | |
4677 | } | |
4678 | ||
aea829b3 DG |
4679 | /* Upon restart, we skip the setup, already done */ |
4680 | if (ua_sess->started) { | |
8be98f9a | 4681 | goto skip_setup; |
aea829b3 | 4682 | } |
8be98f9a | 4683 | |
d65d2de8 DG |
4684 | /* |
4685 | * Create the metadata for the application. This returns gracefully if a | |
4686 | * metadata was already set for the session. | |
4687 | */ | |
ad7a9107 | 4688 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer); |
421cb601 | 4689 | if (ret < 0) { |
d0b96690 | 4690 | goto error_unlock; |
421cb601 | 4691 | } |
48842b30 | 4692 | |
840cb59c | 4693 | health_code_update(); |
86acf0da | 4694 | |
8be98f9a | 4695 | skip_setup: |
a945cdc7 | 4696 | /* This starts the UST tracing */ |
fb45065e | 4697 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4698 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
fb45065e | 4699 | pthread_mutex_unlock(&app->sock_lock); |
421cb601 | 4700 | if (ret < 0) { |
ffe60014 DG |
4701 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4702 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
4703 | app->pid, ret); | |
4704 | } else { | |
4705 | DBG("UST app start session failed. Application is dead."); | |
3757b385 DG |
4706 | /* |
4707 | * This is normal behavior, an application can die during the | |
4708 | * creation process. Don't report an error so the execution can | |
4709 | * continue normally. | |
4710 | */ | |
4711 | pthread_mutex_unlock(&ua_sess->lock); | |
4712 | goto end; | |
ffe60014 | 4713 | } |
d0b96690 | 4714 | goto error_unlock; |
421cb601 | 4715 | } |
5b4a0ec0 | 4716 | |
55c3953d DG |
4717 | /* Indicate that the session has been started once */ |
4718 | ua_sess->started = 1; | |
b0a1c741 | 4719 | ua_sess->enabled = 1; |
55c3953d | 4720 | |
d0b96690 DG |
4721 | pthread_mutex_unlock(&ua_sess->lock); |
4722 | ||
840cb59c | 4723 | health_code_update(); |
86acf0da | 4724 | |
421cb601 | 4725 | /* Quiescent wait after starting trace */ |
fb45065e | 4726 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4727 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4728 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4729 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4730 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4731 | app->pid, ret); | |
4732 | } | |
48842b30 | 4733 | |
e0c7ec2b DG |
4734 | end: |
4735 | rcu_read_unlock(); | |
840cb59c | 4736 | health_code_update(); |
421cb601 | 4737 | return 0; |
48842b30 | 4738 | |
d0b96690 DG |
4739 | error_unlock: |
4740 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 4741 | rcu_read_unlock(); |
840cb59c | 4742 | health_code_update(); |
421cb601 DG |
4743 | return -1; |
4744 | } | |
48842b30 | 4745 | |
8be98f9a MD |
4746 | /* |
4747 | * Stop tracing for a specific UST session and app. | |
4748 | */ | |
b34cbebf | 4749 | static |
8be98f9a MD |
4750 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
4751 | { | |
4752 | int ret = 0; | |
4753 | struct ust_app_session *ua_sess; | |
7972aab2 | 4754 | struct ust_registry_session *registry; |
8be98f9a | 4755 | |
852d0037 | 4756 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
4757 | |
4758 | rcu_read_lock(); | |
4759 | ||
e0c7ec2b | 4760 | if (!app->compatible) { |
d88aee68 | 4761 | goto end_no_session; |
e0c7ec2b DG |
4762 | } |
4763 | ||
8be98f9a MD |
4764 | ua_sess = lookup_session_by_app(usess, app); |
4765 | if (ua_sess == NULL) { | |
d88aee68 | 4766 | goto end_no_session; |
8be98f9a MD |
4767 | } |
4768 | ||
d88aee68 DG |
4769 | pthread_mutex_lock(&ua_sess->lock); |
4770 | ||
b161602a MD |
4771 | if (ua_sess->deleted) { |
4772 | pthread_mutex_unlock(&ua_sess->lock); | |
4773 | goto end_no_session; | |
4774 | } | |
4775 | ||
9bc07046 DG |
4776 | /* |
4777 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
4778 | * that was never started. It's possible since we can have a fail start |
4779 | * from either the application manager thread or the command thread. Simply | |
4780 | * indicate that this is a stop error. | |
9bc07046 | 4781 | */ |
f9dfc3d9 | 4782 | if (!ua_sess->started) { |
c45536e1 DG |
4783 | goto error_rcu_unlock; |
4784 | } | |
7db205b5 | 4785 | |
840cb59c | 4786 | health_code_update(); |
86acf0da | 4787 | |
9d6c7d3f | 4788 | /* This inhibits UST tracing */ |
fb45065e | 4789 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4790 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
fb45065e | 4791 | pthread_mutex_unlock(&app->sock_lock); |
9d6c7d3f | 4792 | if (ret < 0) { |
ffe60014 DG |
4793 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4794 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
4795 | app->pid, ret); | |
4796 | } else { | |
4797 | DBG("UST app stop session failed. Application is dead."); | |
3757b385 DG |
4798 | /* |
4799 | * This is normal behavior, an application can die during the | |
4800 | * creation process. Don't report an error so the execution can | |
4801 | * continue normally. | |
4802 | */ | |
4803 | goto end_unlock; | |
ffe60014 | 4804 | } |
9d6c7d3f DG |
4805 | goto error_rcu_unlock; |
4806 | } | |
4807 | ||
840cb59c | 4808 | health_code_update(); |
b0a1c741 | 4809 | ua_sess->enabled = 0; |
86acf0da | 4810 | |
9d6c7d3f | 4811 | /* Quiescent wait after stopping trace */ |
fb45065e | 4812 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4813 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4814 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4815 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4816 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4817 | app->pid, ret); | |
4818 | } | |
9d6c7d3f | 4819 | |
840cb59c | 4820 | health_code_update(); |
86acf0da | 4821 | |
b34cbebf | 4822 | registry = get_session_registry(ua_sess); |
fad1ed2f JR |
4823 | |
4824 | /* The UST app session is held registry shall not be null. */ | |
b34cbebf | 4825 | assert(registry); |
1b532a60 | 4826 | |
ce34fcd0 MD |
4827 | /* Push metadata for application before freeing the application. */ |
4828 | (void) push_metadata(registry, ua_sess->consumer); | |
b34cbebf | 4829 | |
3757b385 | 4830 | end_unlock: |
b34cbebf MD |
4831 | pthread_mutex_unlock(&ua_sess->lock); |
4832 | end_no_session: | |
4833 | rcu_read_unlock(); | |
4834 | health_code_update(); | |
4835 | return 0; | |
4836 | ||
4837 | error_rcu_unlock: | |
4838 | pthread_mutex_unlock(&ua_sess->lock); | |
4839 | rcu_read_unlock(); | |
4840 | health_code_update(); | |
4841 | return -1; | |
4842 | } | |
4843 | ||
b34cbebf | 4844 | static |
c4b88406 MD |
4845 | int ust_app_flush_app_session(struct ust_app *app, |
4846 | struct ust_app_session *ua_sess) | |
b34cbebf | 4847 | { |
c4b88406 | 4848 | int ret, retval = 0; |
b34cbebf | 4849 | struct lttng_ht_iter iter; |
b34cbebf | 4850 | struct ust_app_channel *ua_chan; |
c4b88406 | 4851 | struct consumer_socket *socket; |
b34cbebf | 4852 | |
c4b88406 | 4853 | DBG("Flushing app session buffers for ust app pid %d", app->pid); |
b34cbebf MD |
4854 | |
4855 | rcu_read_lock(); | |
4856 | ||
4857 | if (!app->compatible) { | |
c4b88406 | 4858 | goto end_not_compatible; |
b34cbebf MD |
4859 | } |
4860 | ||
4861 | pthread_mutex_lock(&ua_sess->lock); | |
4862 | ||
b161602a MD |
4863 | if (ua_sess->deleted) { |
4864 | goto end_deleted; | |
4865 | } | |
4866 | ||
b34cbebf MD |
4867 | health_code_update(); |
4868 | ||
9d6c7d3f | 4869 | /* Flushing buffers */ |
c4b88406 MD |
4870 | socket = consumer_find_socket_by_bitness(app->bits_per_long, |
4871 | ua_sess->consumer); | |
ce34fcd0 MD |
4872 | |
4873 | /* Flush buffers and push metadata. */ | |
4874 | switch (ua_sess->buffer_type) { | |
4875 | case LTTNG_BUFFER_PER_PID: | |
4876 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, | |
4877 | node.node) { | |
4878 | health_code_update(); | |
ce34fcd0 MD |
4879 | ret = consumer_flush_channel(socket, ua_chan->key); |
4880 | if (ret) { | |
4881 | ERR("Error flushing consumer channel"); | |
4882 | retval = -1; | |
4883 | continue; | |
4884 | } | |
8be98f9a | 4885 | } |
ce34fcd0 MD |
4886 | break; |
4887 | case LTTNG_BUFFER_PER_UID: | |
4888 | default: | |
4889 | assert(0); | |
4890 | break; | |
8be98f9a | 4891 | } |
8be98f9a | 4892 | |
840cb59c | 4893 | health_code_update(); |
86acf0da | 4894 | |
b161602a | 4895 | end_deleted: |
d88aee68 | 4896 | pthread_mutex_unlock(&ua_sess->lock); |
ce34fcd0 | 4897 | |
c4b88406 MD |
4898 | end_not_compatible: |
4899 | rcu_read_unlock(); | |
4900 | health_code_update(); | |
4901 | return retval; | |
4902 | } | |
4903 | ||
4904 | /* | |
ce34fcd0 MD |
4905 | * Flush buffers for all applications for a specific UST session. |
4906 | * Called with UST session lock held. | |
c4b88406 MD |
4907 | */ |
4908 | static | |
ce34fcd0 | 4909 | int ust_app_flush_session(struct ltt_ust_session *usess) |
c4b88406 MD |
4910 | |
4911 | { | |
99b1411c | 4912 | int ret = 0; |
c4b88406 | 4913 | |
ce34fcd0 | 4914 | DBG("Flushing session buffers for all ust apps"); |
c4b88406 MD |
4915 | |
4916 | rcu_read_lock(); | |
4917 | ||
ce34fcd0 MD |
4918 | /* Flush buffers and push metadata. */ |
4919 | switch (usess->buffer_type) { | |
4920 | case LTTNG_BUFFER_PER_UID: | |
4921 | { | |
4922 | struct buffer_reg_uid *reg; | |
4923 | struct lttng_ht_iter iter; | |
4924 | ||
4925 | /* Flush all per UID buffers associated to that session. */ | |
4926 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
4927 | struct ust_registry_session *ust_session_reg; | |
4928 | struct buffer_reg_channel *reg_chan; | |
4929 | struct consumer_socket *socket; | |
4930 | ||
4931 | /* Get consumer socket to use to push the metadata.*/ | |
4932 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
4933 | usess->consumer); | |
4934 | if (!socket) { | |
4935 | /* Ignore request if no consumer is found for the session. */ | |
4936 | continue; | |
4937 | } | |
4938 | ||
4939 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
4940 | reg_chan, node.node) { | |
4941 | /* | |
4942 | * The following call will print error values so the return | |
4943 | * code is of little importance because whatever happens, we | |
4944 | * have to try them all. | |
4945 | */ | |
4946 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
4947 | } | |
4948 | ||
4949 | ust_session_reg = reg->registry->reg.ust; | |
4950 | /* Push metadata. */ | |
4951 | (void) push_metadata(ust_session_reg, usess->consumer); | |
4952 | } | |
ce34fcd0 MD |
4953 | break; |
4954 | } | |
4955 | case LTTNG_BUFFER_PER_PID: | |
4956 | { | |
4957 | struct ust_app_session *ua_sess; | |
4958 | struct lttng_ht_iter iter; | |
4959 | struct ust_app *app; | |
4960 | ||
4961 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4962 | ua_sess = lookup_session_by_app(usess, app); | |
4963 | if (ua_sess == NULL) { | |
4964 | continue; | |
4965 | } | |
4966 | (void) ust_app_flush_app_session(app, ua_sess); | |
4967 | } | |
4968 | break; | |
4969 | } | |
4970 | default: | |
99b1411c | 4971 | ret = -1; |
ce34fcd0 MD |
4972 | assert(0); |
4973 | break; | |
c4b88406 | 4974 | } |
c4b88406 | 4975 | |
7db205b5 | 4976 | rcu_read_unlock(); |
840cb59c | 4977 | health_code_update(); |
c4b88406 | 4978 | return ret; |
8be98f9a MD |
4979 | } |
4980 | ||
0dd01979 MD |
4981 | static |
4982 | int ust_app_clear_quiescent_app_session(struct ust_app *app, | |
4983 | struct ust_app_session *ua_sess) | |
4984 | { | |
4985 | int ret = 0; | |
4986 | struct lttng_ht_iter iter; | |
4987 | struct ust_app_channel *ua_chan; | |
4988 | struct consumer_socket *socket; | |
4989 | ||
4990 | DBG("Clearing stream quiescent state for ust app pid %d", app->pid); | |
4991 | ||
4992 | rcu_read_lock(); | |
4993 | ||
4994 | if (!app->compatible) { | |
4995 | goto end_not_compatible; | |
4996 | } | |
4997 | ||
4998 | pthread_mutex_lock(&ua_sess->lock); | |
4999 | ||
5000 | if (ua_sess->deleted) { | |
5001 | goto end_unlock; | |
5002 | } | |
5003 | ||
5004 | health_code_update(); | |
5005 | ||
5006 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
5007 | ua_sess->consumer); | |
5008 | if (!socket) { | |
5009 | ERR("Failed to find consumer (%" PRIu32 ") socket", | |
5010 | app->bits_per_long); | |
5011 | ret = -1; | |
5012 | goto end_unlock; | |
5013 | } | |
5014 | ||
5015 | /* Clear quiescent state. */ | |
5016 | switch (ua_sess->buffer_type) { | |
5017 | case LTTNG_BUFFER_PER_PID: | |
5018 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, | |
5019 | ua_chan, node.node) { | |
5020 | health_code_update(); | |
5021 | ret = consumer_clear_quiescent_channel(socket, | |
5022 | ua_chan->key); | |
5023 | if (ret) { | |
5024 | ERR("Error clearing quiescent state for consumer channel"); | |
5025 | ret = -1; | |
5026 | continue; | |
5027 | } | |
5028 | } | |
5029 | break; | |
5030 | case LTTNG_BUFFER_PER_UID: | |
5031 | default: | |
5032 | assert(0); | |
5033 | ret = -1; | |
5034 | break; | |
5035 | } | |
5036 | ||
5037 | health_code_update(); | |
5038 | ||
5039 | end_unlock: | |
5040 | pthread_mutex_unlock(&ua_sess->lock); | |
5041 | ||
5042 | end_not_compatible: | |
5043 | rcu_read_unlock(); | |
5044 | health_code_update(); | |
5045 | return ret; | |
5046 | } | |
5047 | ||
5048 | /* | |
5049 | * Clear quiescent state in each stream for all applications for a | |
5050 | * specific UST session. | |
5051 | * Called with UST session lock held. | |
5052 | */ | |
5053 | static | |
5054 | int ust_app_clear_quiescent_session(struct ltt_ust_session *usess) | |
5055 | ||
5056 | { | |
5057 | int ret = 0; | |
5058 | ||
5059 | DBG("Clearing stream quiescent state for all ust apps"); | |
5060 | ||
5061 | rcu_read_lock(); | |
5062 | ||
5063 | switch (usess->buffer_type) { | |
5064 | case LTTNG_BUFFER_PER_UID: | |
5065 | { | |
5066 | struct lttng_ht_iter iter; | |
5067 | struct buffer_reg_uid *reg; | |
5068 | ||
5069 | /* | |
5070 | * Clear quiescent for all per UID buffers associated to | |
5071 | * that session. | |
5072 | */ | |
5073 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
5074 | struct consumer_socket *socket; | |
5075 | struct buffer_reg_channel *reg_chan; | |
5076 | ||
5077 | /* Get associated consumer socket.*/ | |
5078 | socket = consumer_find_socket_by_bitness( | |
5079 | reg->bits_per_long, usess->consumer); | |
5080 | if (!socket) { | |
5081 | /* | |
5082 | * Ignore request if no consumer is found for | |
5083 | * the session. | |
5084 | */ | |
5085 | continue; | |
5086 | } | |
5087 | ||
5088 | cds_lfht_for_each_entry(reg->registry->channels->ht, | |
5089 | &iter.iter, reg_chan, node.node) { | |
5090 | /* | |
5091 | * The following call will print error values so | |
5092 | * the return code is of little importance | |
5093 | * because whatever happens, we have to try them | |
5094 | * all. | |
5095 | */ | |
5096 | (void) consumer_clear_quiescent_channel(socket, | |
5097 | reg_chan->consumer_key); | |
5098 | } | |
5099 | } | |
5100 | break; | |
5101 | } | |
5102 | case LTTNG_BUFFER_PER_PID: | |
5103 | { | |
5104 | struct ust_app_session *ua_sess; | |
5105 | struct lttng_ht_iter iter; | |
5106 | struct ust_app *app; | |
5107 | ||
5108 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, | |
5109 | pid_n.node) { | |
5110 | ua_sess = lookup_session_by_app(usess, app); | |
5111 | if (ua_sess == NULL) { | |
5112 | continue; | |
5113 | } | |
5114 | (void) ust_app_clear_quiescent_app_session(app, | |
5115 | ua_sess); | |
5116 | } | |
5117 | break; | |
5118 | } | |
5119 | default: | |
5120 | ret = -1; | |
5121 | assert(0); | |
5122 | break; | |
5123 | } | |
5124 | ||
5125 | rcu_read_unlock(); | |
5126 | health_code_update(); | |
5127 | return ret; | |
5128 | } | |
5129 | ||
84cd17c6 MD |
5130 | /* |
5131 | * Destroy a specific UST session in apps. | |
5132 | */ | |
3353de95 | 5133 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 5134 | { |
ffe60014 | 5135 | int ret; |
84cd17c6 | 5136 | struct ust_app_session *ua_sess; |
bec39940 | 5137 | struct lttng_ht_iter iter; |
d9bf3ca4 | 5138 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 5139 | |
852d0037 | 5140 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
5141 | |
5142 | rcu_read_lock(); | |
5143 | ||
e0c7ec2b DG |
5144 | if (!app->compatible) { |
5145 | goto end; | |
5146 | } | |
5147 | ||
84cd17c6 | 5148 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 5149 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 5150 | if (node == NULL) { |
d42f20df DG |
5151 | /* Session is being or is deleted. */ |
5152 | goto end; | |
84cd17c6 MD |
5153 | } |
5154 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 5155 | |
840cb59c | 5156 | health_code_update(); |
d0b96690 | 5157 | destroy_app_session(app, ua_sess); |
84cd17c6 | 5158 | |
840cb59c | 5159 | health_code_update(); |
7db205b5 | 5160 | |
84cd17c6 | 5161 | /* Quiescent wait after stopping trace */ |
fb45065e | 5162 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 5163 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 5164 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
5165 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
5166 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
5167 | app->pid, ret); | |
5168 | } | |
e0c7ec2b DG |
5169 | end: |
5170 | rcu_read_unlock(); | |
840cb59c | 5171 | health_code_update(); |
84cd17c6 | 5172 | return 0; |
84cd17c6 MD |
5173 | } |
5174 | ||
5b4a0ec0 DG |
5175 | /* |
5176 | * Start tracing for the UST session. | |
5177 | */ | |
421cb601 DG |
5178 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
5179 | { | |
bec39940 | 5180 | struct lttng_ht_iter iter; |
421cb601 | 5181 | struct ust_app *app; |
48842b30 | 5182 | |
421cb601 DG |
5183 | DBG("Starting all UST traces"); |
5184 | ||
bb2452c8 MD |
5185 | /* |
5186 | * Even though the start trace might fail, flag this session active so | |
5187 | * other application coming in are started by default. | |
5188 | */ | |
5189 | usess->active = 1; | |
5190 | ||
421cb601 | 5191 | rcu_read_lock(); |
421cb601 | 5192 | |
0dd01979 MD |
5193 | /* |
5194 | * In a start-stop-start use-case, we need to clear the quiescent state | |
5195 | * of each channel set by the prior stop command, thus ensuring that a | |
5196 | * following stop or destroy is sure to grab a timestamp_end near those | |
5197 | * operations, even if the packet is empty. | |
5198 | */ | |
5199 | (void) ust_app_clear_quiescent_session(usess); | |
5200 | ||
0498a00c MD |
5201 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
5202 | ust_app_global_update(usess, app); | |
5203 | } | |
5204 | ||
48842b30 DG |
5205 | rcu_read_unlock(); |
5206 | ||
5207 | return 0; | |
5208 | } | |
487cf67c | 5209 | |
8be98f9a MD |
5210 | /* |
5211 | * Start tracing for the UST session. | |
ce34fcd0 | 5212 | * Called with UST session lock held. |
8be98f9a MD |
5213 | */ |
5214 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
5215 | { | |
5216 | int ret = 0; | |
bec39940 | 5217 | struct lttng_ht_iter iter; |
8be98f9a MD |
5218 | struct ust_app *app; |
5219 | ||
5220 | DBG("Stopping all UST traces"); | |
5221 | ||
bb2452c8 MD |
5222 | /* |
5223 | * Even though the stop trace might fail, flag this session inactive so | |
5224 | * other application coming in are not started by default. | |
5225 | */ | |
5226 | usess->active = 0; | |
5227 | ||
8be98f9a MD |
5228 | rcu_read_lock(); |
5229 | ||
b34cbebf MD |
5230 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
5231 | ret = ust_app_stop_trace(usess, app); | |
5232 | if (ret < 0) { | |
5233 | /* Continue to next apps even on error */ | |
5234 | continue; | |
5235 | } | |
5236 | } | |
5237 | ||
ce34fcd0 | 5238 | (void) ust_app_flush_session(usess); |
8be98f9a MD |
5239 | |
5240 | rcu_read_unlock(); | |
5241 | ||
5242 | return 0; | |
5243 | } | |
5244 | ||
84cd17c6 MD |
5245 | /* |
5246 | * Destroy app UST session. | |
5247 | */ | |
5248 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
5249 | { | |
5250 | int ret = 0; | |
bec39940 | 5251 | struct lttng_ht_iter iter; |
84cd17c6 MD |
5252 | struct ust_app *app; |
5253 | ||
5254 | DBG("Destroy all UST traces"); | |
5255 | ||
5256 | rcu_read_lock(); | |
5257 | ||
852d0037 | 5258 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 5259 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
5260 | if (ret < 0) { |
5261 | /* Continue to next apps even on error */ | |
5262 | continue; | |
5263 | } | |
5264 | } | |
5265 | ||
5266 | rcu_read_unlock(); | |
5267 | ||
5268 | return 0; | |
5269 | } | |
5270 | ||
88e3c2f5 | 5271 | /* The ua_sess lock must be held by the caller. */ |
a9ad0c8f | 5272 | static |
88e3c2f5 JG |
5273 | int find_or_create_ust_app_channel( |
5274 | struct ltt_ust_session *usess, | |
5275 | struct ust_app_session *ua_sess, | |
5276 | struct ust_app *app, | |
5277 | struct ltt_ust_channel *uchan, | |
5278 | struct ust_app_channel **ua_chan) | |
487cf67c | 5279 | { |
55c54cce | 5280 | int ret = 0; |
88e3c2f5 JG |
5281 | struct lttng_ht_iter iter; |
5282 | struct lttng_ht_node_str *ua_chan_node; | |
5283 | ||
5284 | lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &iter); | |
5285 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
5286 | if (ua_chan_node) { | |
5287 | *ua_chan = caa_container_of(ua_chan_node, | |
5288 | struct ust_app_channel, node); | |
5289 | goto end; | |
5290 | } | |
5291 | ||
5292 | ret = ust_app_channel_create(usess, ua_sess, uchan, app, ua_chan); | |
5293 | if (ret) { | |
5294 | goto end; | |
5295 | } | |
5296 | end: | |
5297 | return ret; | |
5298 | } | |
5299 | ||
5300 | static | |
5301 | int ust_app_channel_synchronize_event(struct ust_app_channel *ua_chan, | |
5302 | struct ltt_ust_event *uevent, struct ust_app_session *ua_sess, | |
5303 | struct ust_app *app) | |
5304 | { | |
5305 | int ret = 0; | |
5306 | struct ust_app_event *ua_event = NULL; | |
5307 | ||
5308 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
5309 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); | |
5310 | if (!ua_event) { | |
5311 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); | |
5312 | if (ret < 0) { | |
5313 | goto end; | |
5314 | } | |
5315 | } else { | |
5316 | if (ua_event->enabled != uevent->enabled) { | |
5317 | ret = uevent->enabled ? | |
5318 | enable_ust_app_event(ua_sess, ua_event, app) : | |
5319 | disable_ust_app_event(ua_sess, ua_event, app); | |
5320 | } | |
5321 | } | |
5322 | ||
5323 | end: | |
5324 | return ret; | |
5325 | } | |
5326 | ||
d3a684ee JR |
5327 | static |
5328 | void ust_app_synchronize_tokens(struct ust_app *app) | |
5329 | { | |
5330 | int ret = 0; | |
5331 | enum lttng_error_code ret_code; | |
5332 | enum lttng_trigger_status t_status; | |
5333 | struct lttng_ht_iter app_trigger_iter; | |
5334 | struct lttng_triggers *triggers; | |
5335 | struct ust_app_token_event_rule *token_event_rule_element; | |
5336 | unsigned int count; | |
5337 | ||
5338 | rcu_read_lock(); | |
5339 | /* TODO: is this necessary to protect against new trigger being added ? | |
5340 | * notification_trigger_tokens_ht is still the backing data structure | |
5341 | * for this listing. Leave it there for now. | |
5342 | */ | |
5343 | pthread_mutex_lock(¬ification_trigger_tokens_ht_lock); | |
5344 | ret_code = notification_thread_command_get_tokens( | |
5345 | notification_thread_handle, &triggers); | |
5346 | if (ret_code != LTTNG_OK) { | |
5347 | ret = -1; | |
5348 | goto end; | |
5349 | } | |
5350 | ||
5351 | assert(triggers); | |
5352 | ||
5353 | t_status = lttng_triggers_get_count(triggers, &count); | |
5354 | if (t_status != LTTNG_TRIGGER_STATUS_OK) { | |
5355 | ret = -1; | |
5356 | goto end; | |
5357 | } | |
5358 | ||
5359 | for (unsigned int i = 0; i < count; i++) { | |
5360 | struct lttng_condition *condition; | |
5361 | struct lttng_event_rule *event_rule; | |
5362 | struct lttng_trigger *trigger; | |
5363 | struct ust_app_token_event_rule *ua_token; | |
5364 | uint64_t token; | |
5365 | ||
5366 | trigger = lttng_triggers_get_pointer_of_index(triggers, i); | |
5367 | assert(trigger); | |
5368 | ||
5369 | /* TODO: error checking and type checking */ | |
5370 | token = lttng_trigger_get_key(trigger); | |
5371 | condition = lttng_trigger_get_condition(trigger); | |
5372 | (void) lttng_condition_event_rule_get_rule_no_const(condition, &event_rule); | |
5373 | ||
5374 | if (lttng_event_rule_get_domain_type(event_rule) == LTTNG_DOMAIN_KERNEL) { | |
5375 | /* Skip kernel related trigger */ | |
5376 | continue; | |
5377 | } | |
5378 | ||
5379 | /* Iterate over all known token trigger */ | |
5380 | ua_token = find_ust_app_token_event_rule(app->tokens_ht, token); | |
5381 | if (!ua_token) { | |
5382 | ret = create_ust_app_token_event_rule(event_rule, app, token); | |
5383 | if (ret < 0) { | |
5384 | goto end; | |
5385 | } | |
5386 | } | |
5387 | } | |
5388 | ||
5389 | /* Remove all unknown trigger from the app | |
5390 | * TODO find a way better way then this, do it on the unregister command | |
5391 | * and be specific on the token to remove instead of going over all | |
5392 | * trigger known to the app. This is sub optimal. | |
5393 | */ | |
5394 | cds_lfht_for_each_entry (app->tokens_ht->ht, &app_trigger_iter.iter, | |
5395 | token_event_rule_element, node.node) { | |
5396 | uint64_t token; | |
5397 | bool found = false; | |
5398 | ||
5399 | token = token_event_rule_element->token; | |
5400 | ||
5401 | /* | |
5402 | * Check if the app event trigger still exists on the | |
5403 | * notification side. | |
5404 | * TODO: might want to change the backing data struct of the | |
5405 | * lttng_triggers object to allow quick lookup? | |
5406 | * For kernel mostly all of this can be removed once we delete | |
5407 | * on a per trigger basis. | |
5408 | */ | |
5409 | ||
5410 | for (unsigned int i = 0; i < count; i++) { | |
5411 | struct lttng_trigger *trigger; | |
5412 | uint64_t inner_token; | |
5413 | ||
5414 | trigger = lttng_triggers_get_pointer_of_index( | |
5415 | triggers, i); | |
5416 | assert(trigger); | |
5417 | ||
5418 | inner_token = lttng_trigger_get_key(trigger); | |
5419 | ||
5420 | if (inner_token == token) { | |
5421 | found = true; | |
5422 | break; | |
5423 | } | |
5424 | } | |
5425 | ||
5426 | if (found) { | |
5427 | /* Still valid */ | |
5428 | continue; | |
5429 | } | |
5430 | ||
5431 | /* TODO: This is fucking ugly API for fuck sake */ | |
5432 | assert(!lttng_ht_del(app->tokens_ht, &app_trigger_iter)); | |
5433 | ||
5434 | (void) disable_ust_object(app, token_event_rule_element->obj); | |
5435 | ||
5436 | delete_ust_app_token_event_rule(app->sock, token_event_rule_element, app); | |
5437 | } | |
5438 | end: | |
5439 | rcu_read_unlock(); | |
5440 | pthread_mutex_unlock(¬ification_trigger_tokens_ht_lock); | |
5441 | return; | |
5442 | } | |
5443 | ||
88e3c2f5 JG |
5444 | /* |
5445 | * The caller must ensure that the application is compatible and is tracked | |
5446 | * by the PID tracker. | |
5447 | */ | |
5448 | static | |
5449 | void ust_app_synchronize(struct ltt_ust_session *usess, | |
5450 | struct ust_app *app) | |
5451 | { | |
5452 | int ret = 0; | |
5453 | struct cds_lfht_iter uchan_iter; | |
5454 | struct ltt_ust_channel *uchan; | |
3d8ca23b | 5455 | struct ust_app_session *ua_sess = NULL; |
1f3580c7 | 5456 | |
88e3c2f5 JG |
5457 | /* |
5458 | * The application's configuration should only be synchronized for | |
5459 | * active sessions. | |
5460 | */ | |
5461 | assert(usess->active); | |
5462 | ||
5463 | ret = find_or_create_ust_app_session(usess, app, &ua_sess, NULL); | |
3d8ca23b DG |
5464 | if (ret < 0) { |
5465 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
5466 | goto error; |
5467 | } | |
3d8ca23b | 5468 | assert(ua_sess); |
487cf67c | 5469 | |
d0b96690 | 5470 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
5471 | if (ua_sess->deleted) { |
5472 | pthread_mutex_unlock(&ua_sess->lock); | |
5473 | goto end; | |
5474 | } | |
5475 | ||
88e3c2f5 JG |
5476 | rcu_read_lock(); |
5477 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &uchan_iter, | |
5478 | uchan, node.node) { | |
5479 | struct ust_app_channel *ua_chan; | |
5480 | struct cds_lfht_iter uevent_iter; | |
5481 | struct ltt_ust_event *uevent; | |
487cf67c | 5482 | |
31746f93 | 5483 | /* |
88e3c2f5 JG |
5484 | * Search for a matching ust_app_channel. If none is found, |
5485 | * create it. Creating the channel will cause the ua_chan | |
5486 | * structure to be allocated, the channel buffers to be | |
5487 | * allocated (if necessary) and sent to the application, and | |
5488 | * all enabled contexts will be added to the channel. | |
31746f93 | 5489 | */ |
88e3c2f5 JG |
5490 | ret = find_or_create_ust_app_channel(usess, ua_sess, |
5491 | app, uchan, &ua_chan); | |
5492 | if (ret) { | |
5493 | /* Tracer is probably gone or ENOMEM. */ | |
5494 | goto error_unlock; | |
727d5404 DG |
5495 | } |
5496 | ||
88e3c2f5 JG |
5497 | if (!ua_chan) { |
5498 | /* ua_chan will be NULL for the metadata channel */ | |
5499 | continue; | |
5500 | } | |
727d5404 | 5501 | |
88e3c2f5 | 5502 | cds_lfht_for_each_entry(uchan->events->ht, &uevent_iter, uevent, |
bec39940 | 5503 | node.node) { |
88e3c2f5 JG |
5504 | ret = ust_app_channel_synchronize_event(ua_chan, |
5505 | uevent, ua_sess, app); | |
5506 | if (ret) { | |
d0b96690 | 5507 | goto error_unlock; |
487cf67c | 5508 | } |
36dc12cc | 5509 | } |
d0b96690 | 5510 | |
88e3c2f5 JG |
5511 | if (ua_chan->enabled != uchan->enabled) { |
5512 | ret = uchan->enabled ? | |
5513 | enable_ust_app_channel(ua_sess, uchan, app) : | |
5514 | disable_ust_app_channel(ua_sess, ua_chan, app); | |
5515 | if (ret) { | |
5516 | goto error_unlock; | |
5517 | } | |
5518 | } | |
36dc12cc | 5519 | } |
88e3c2f5 | 5520 | rcu_read_unlock(); |
0498a00c | 5521 | |
a9ad0c8f | 5522 | end: |
88e3c2f5 | 5523 | pthread_mutex_unlock(&ua_sess->lock); |
ffe60014 | 5524 | /* Everything went well at this point. */ |
ffe60014 DG |
5525 | return; |
5526 | ||
d0b96690 | 5527 | error_unlock: |
88e3c2f5 | 5528 | rcu_read_unlock(); |
d0b96690 | 5529 | pthread_mutex_unlock(&ua_sess->lock); |
487cf67c | 5530 | error: |
ffe60014 | 5531 | if (ua_sess) { |
d0b96690 | 5532 | destroy_app_session(app, ua_sess); |
ffe60014 | 5533 | } |
487cf67c DG |
5534 | return; |
5535 | } | |
55cc08a6 | 5536 | |
a9ad0c8f MD |
5537 | static |
5538 | void ust_app_global_destroy(struct ltt_ust_session *usess, struct ust_app *app) | |
5539 | { | |
5540 | struct ust_app_session *ua_sess; | |
5541 | ||
5542 | ua_sess = lookup_session_by_app(usess, app); | |
5543 | if (ua_sess == NULL) { | |
5544 | return; | |
5545 | } | |
5546 | destroy_app_session(app, ua_sess); | |
5547 | } | |
5548 | ||
5549 | /* | |
5550 | * Add channels/events from UST global domain to registered apps at sock. | |
5551 | * | |
5552 | * Called with session lock held. | |
5553 | * Called with RCU read-side lock held. | |
5554 | */ | |
5555 | void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app) | |
5556 | { | |
5557 | assert(usess); | |
88e3c2f5 | 5558 | assert(usess->active); |
a9ad0c8f MD |
5559 | |
5560 | DBG2("UST app global update for app sock %d for session id %" PRIu64, | |
5561 | app->sock, usess->id); | |
5562 | ||
5563 | if (!app->compatible) { | |
5564 | return; | |
5565 | } | |
55c9e7ca JR |
5566 | if (trace_ust_id_tracker_lookup(LTTNG_TRACKER_VPID, usess, app->pid) && |
5567 | trace_ust_id_tracker_lookup( | |
5568 | LTTNG_TRACKER_VUID, usess, app->uid) && | |
5569 | trace_ust_id_tracker_lookup( | |
5570 | LTTNG_TRACKER_VGID, usess, app->gid)) { | |
88e3c2f5 JG |
5571 | /* |
5572 | * Synchronize the application's internal tracing configuration | |
5573 | * and start tracing. | |
5574 | */ | |
5575 | ust_app_synchronize(usess, app); | |
5576 | ust_app_start_trace(usess, app); | |
a9ad0c8f MD |
5577 | } else { |
5578 | ust_app_global_destroy(usess, app); | |
5579 | } | |
5580 | } | |
5581 | ||
d3a684ee JR |
5582 | void ust_app_global_update_tokens(struct ust_app *app) |
5583 | { | |
5584 | DBG2("UST app global update token for app sock %d", app->sock); | |
5585 | ||
5586 | if (!app->compatible) { | |
5587 | return; | |
5588 | } | |
5589 | ust_app_synchronize_tokens(app); | |
5590 | } | |
5591 | ||
a9ad0c8f MD |
5592 | /* |
5593 | * Called with session lock held. | |
5594 | */ | |
5595 | void ust_app_global_update_all(struct ltt_ust_session *usess) | |
5596 | { | |
5597 | struct lttng_ht_iter iter; | |
5598 | struct ust_app *app; | |
5599 | ||
5600 | rcu_read_lock(); | |
5601 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5602 | ust_app_global_update(usess, app); | |
5603 | } | |
5604 | rcu_read_unlock(); | |
5605 | } | |
5606 | ||
d3a684ee JR |
5607 | void ust_app_global_update_all_tokens(void) |
5608 | { | |
5609 | struct lttng_ht_iter iter; | |
5610 | struct ust_app *app; | |
5611 | ||
5612 | rcu_read_lock(); | |
5613 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5614 | ust_app_global_update_tokens(app); | |
5615 | } | |
5616 | rcu_read_unlock(); | |
5617 | } | |
5618 | ||
55cc08a6 DG |
5619 | /* |
5620 | * Add context to a specific channel for global UST domain. | |
5621 | */ | |
5622 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
5623 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
5624 | { | |
5625 | int ret = 0; | |
bec39940 DG |
5626 | struct lttng_ht_node_str *ua_chan_node; |
5627 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
5628 | struct ust_app_channel *ua_chan = NULL; |
5629 | struct ust_app_session *ua_sess; | |
5630 | struct ust_app *app; | |
5631 | ||
88e3c2f5 | 5632 | assert(usess->active); |
0498a00c | 5633 | |
55cc08a6 | 5634 | rcu_read_lock(); |
852d0037 | 5635 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
5636 | if (!app->compatible) { |
5637 | /* | |
5638 | * TODO: In time, we should notice the caller of this error by | |
5639 | * telling him that this is a version error. | |
5640 | */ | |
5641 | continue; | |
5642 | } | |
55cc08a6 DG |
5643 | ua_sess = lookup_session_by_app(usess, app); |
5644 | if (ua_sess == NULL) { | |
5645 | continue; | |
5646 | } | |
5647 | ||
d0b96690 | 5648 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
5649 | |
5650 | if (ua_sess->deleted) { | |
5651 | pthread_mutex_unlock(&ua_sess->lock); | |
5652 | continue; | |
5653 | } | |
5654 | ||
55cc08a6 | 5655 | /* Lookup channel in the ust app session */ |
bec39940 DG |
5656 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
5657 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 5658 | if (ua_chan_node == NULL) { |
d0b96690 | 5659 | goto next_app; |
55cc08a6 DG |
5660 | } |
5661 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
5662 | node); | |
c9edf082 | 5663 | ret = create_ust_app_channel_context(ua_chan, &uctx->ctx, app); |
55cc08a6 | 5664 | if (ret < 0) { |
d0b96690 | 5665 | goto next_app; |
55cc08a6 | 5666 | } |
d0b96690 DG |
5667 | next_app: |
5668 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
5669 | } |
5670 | ||
55cc08a6 | 5671 | rcu_read_unlock(); |
76d45b40 DG |
5672 | return ret; |
5673 | } | |
7f79d3a1 | 5674 | |
d0b96690 DG |
5675 | /* |
5676 | * Receive registration and populate the given msg structure. | |
5677 | * | |
5678 | * On success return 0 else a negative value returned by the ustctl call. | |
5679 | */ | |
5680 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
5681 | { | |
5682 | int ret; | |
5683 | uint32_t pid, ppid, uid, gid; | |
5684 | ||
5685 | assert(msg); | |
5686 | ||
5687 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
5688 | &pid, &ppid, &uid, &gid, | |
5689 | &msg->bits_per_long, | |
5690 | &msg->uint8_t_alignment, | |
5691 | &msg->uint16_t_alignment, | |
5692 | &msg->uint32_t_alignment, | |
5693 | &msg->uint64_t_alignment, | |
5694 | &msg->long_alignment, | |
5695 | &msg->byte_order, | |
5696 | msg->name); | |
5697 | if (ret < 0) { | |
5698 | switch (-ret) { | |
5699 | case EPIPE: | |
5700 | case ECONNRESET: | |
5701 | case LTTNG_UST_ERR_EXITING: | |
5702 | DBG3("UST app recv reg message failed. Application died"); | |
5703 | break; | |
5704 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
5705 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
5706 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
5707 | LTTNG_UST_ABI_MINOR_VERSION); | |
5708 | break; | |
5709 | default: | |
5710 | ERR("UST app recv reg message failed with ret %d", ret); | |
5711 | break; | |
5712 | } | |
5713 | goto error; | |
5714 | } | |
5715 | msg->pid = (pid_t) pid; | |
5716 | msg->ppid = (pid_t) ppid; | |
5717 | msg->uid = (uid_t) uid; | |
5718 | msg->gid = (gid_t) gid; | |
5719 | ||
5720 | error: | |
5721 | return ret; | |
5722 | } | |
5723 | ||
10b56aef MD |
5724 | /* |
5725 | * Return a ust app session object using the application object and the | |
5726 | * session object descriptor has a key. If not found, NULL is returned. | |
5727 | * A RCU read side lock MUST be acquired when calling this function. | |
5728 | */ | |
5729 | static struct ust_app_session *find_session_by_objd(struct ust_app *app, | |
5730 | int objd) | |
5731 | { | |
5732 | struct lttng_ht_node_ulong *node; | |
5733 | struct lttng_ht_iter iter; | |
5734 | struct ust_app_session *ua_sess = NULL; | |
5735 | ||
5736 | assert(app); | |
5737 | ||
5738 | lttng_ht_lookup(app->ust_sessions_objd, (void *)((unsigned long) objd), &iter); | |
5739 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5740 | if (node == NULL) { | |
5741 | DBG2("UST app session find by objd %d not found", objd); | |
5742 | goto error; | |
5743 | } | |
5744 | ||
5745 | ua_sess = caa_container_of(node, struct ust_app_session, ust_objd_node); | |
5746 | ||
5747 | error: | |
5748 | return ua_sess; | |
5749 | } | |
5750 | ||
d88aee68 DG |
5751 | /* |
5752 | * Return a ust app channel object using the application object and the channel | |
5753 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
5754 | * lock MUST be acquired before calling this function. | |
5755 | */ | |
d0b96690 DG |
5756 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
5757 | int objd) | |
5758 | { | |
5759 | struct lttng_ht_node_ulong *node; | |
5760 | struct lttng_ht_iter iter; | |
5761 | struct ust_app_channel *ua_chan = NULL; | |
5762 | ||
5763 | assert(app); | |
5764 | ||
5765 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
5766 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5767 | if (node == NULL) { | |
5768 | DBG2("UST app channel find by objd %d not found", objd); | |
5769 | goto error; | |
5770 | } | |
5771 | ||
5772 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
5773 | ||
5774 | error: | |
5775 | return ua_chan; | |
5776 | } | |
5777 | ||
d88aee68 DG |
5778 | /* |
5779 | * Reply to a register channel notification from an application on the notify | |
5780 | * socket. The channel metadata is also created. | |
5781 | * | |
5782 | * The session UST registry lock is acquired in this function. | |
5783 | * | |
5784 | * On success 0 is returned else a negative value. | |
5785 | */ | |
8eede835 | 5786 | static int reply_ust_register_channel(int sock, int cobjd, |
d0b96690 DG |
5787 | size_t nr_fields, struct ustctl_field *fields) |
5788 | { | |
5789 | int ret, ret_code = 0; | |
294e218e | 5790 | uint32_t chan_id; |
7972aab2 | 5791 | uint64_t chan_reg_key; |
d0b96690 DG |
5792 | enum ustctl_channel_header type; |
5793 | struct ust_app *app; | |
5794 | struct ust_app_channel *ua_chan; | |
5795 | struct ust_app_session *ua_sess; | |
7972aab2 | 5796 | struct ust_registry_session *registry; |
45893984 | 5797 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
5798 | |
5799 | rcu_read_lock(); | |
5800 | ||
5801 | /* Lookup application. If not found, there is a code flow error. */ | |
5802 | app = find_app_by_notify_sock(sock); | |
d88aee68 | 5803 | if (!app) { |
fad1ed2f | 5804 | DBG("Application socket %d is being torn down. Abort event notify", |
d88aee68 DG |
5805 | sock); |
5806 | ret = 0; | |
5807 | goto error_rcu_unlock; | |
5808 | } | |
d0b96690 | 5809 | |
4950b860 | 5810 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 5811 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 | 5812 | if (!ua_chan) { |
fad1ed2f | 5813 | DBG("Application channel is being torn down. Abort event notify"); |
4950b860 MD |
5814 | ret = 0; |
5815 | goto error_rcu_unlock; | |
5816 | } | |
5817 | ||
d0b96690 DG |
5818 | assert(ua_chan->session); |
5819 | ua_sess = ua_chan->session; | |
d0b96690 | 5820 | |
7972aab2 DG |
5821 | /* Get right session registry depending on the session buffer type. */ |
5822 | registry = get_session_registry(ua_sess); | |
fad1ed2f JR |
5823 | if (!registry) { |
5824 | DBG("Application session is being torn down. Abort event notify"); | |
5825 | ret = 0; | |
5826 | goto error_rcu_unlock; | |
5827 | }; | |
45893984 | 5828 | |
7972aab2 DG |
5829 | /* Depending on the buffer type, a different channel key is used. */ |
5830 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
5831 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 5832 | } else { |
7972aab2 | 5833 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
5834 | } |
5835 | ||
7972aab2 DG |
5836 | pthread_mutex_lock(®istry->lock); |
5837 | ||
5838 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
5839 | assert(chan_reg); | |
5840 | ||
5841 | if (!chan_reg->register_done) { | |
294e218e MD |
5842 | /* |
5843 | * TODO: eventually use the registry event count for | |
5844 | * this channel to better guess header type for per-pid | |
5845 | * buffers. | |
5846 | */ | |
5847 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
7972aab2 DG |
5848 | chan_reg->nr_ctx_fields = nr_fields; |
5849 | chan_reg->ctx_fields = fields; | |
fad1ed2f | 5850 | fields = NULL; |
7972aab2 | 5851 | chan_reg->header_type = type; |
d0b96690 | 5852 | } else { |
7972aab2 DG |
5853 | /* Get current already assigned values. */ |
5854 | type = chan_reg->header_type; | |
d0b96690 | 5855 | } |
7972aab2 DG |
5856 | /* Channel id is set during the object creation. */ |
5857 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
5858 | |
5859 | /* Append to metadata */ | |
7972aab2 DG |
5860 | if (!chan_reg->metadata_dumped) { |
5861 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
5862 | if (ret_code) { |
5863 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
5864 | goto reply; | |
5865 | } | |
5866 | } | |
5867 | ||
5868 | reply: | |
7972aab2 DG |
5869 | DBG3("UST app replying to register channel key %" PRIu64 |
5870 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
5871 | ret_code); | |
d0b96690 DG |
5872 | |
5873 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
5874 | if (ret < 0) { | |
5875 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5876 | ERR("UST app reply channel failed with ret %d", ret); | |
5877 | } else { | |
5878 | DBG3("UST app reply channel failed. Application died"); | |
5879 | } | |
5880 | goto error; | |
5881 | } | |
5882 | ||
7972aab2 DG |
5883 | /* This channel registry registration is completed. */ |
5884 | chan_reg->register_done = 1; | |
5885 | ||
d0b96690 | 5886 | error: |
7972aab2 | 5887 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 5888 | error_rcu_unlock: |
d0b96690 | 5889 | rcu_read_unlock(); |
fad1ed2f | 5890 | free(fields); |
d0b96690 DG |
5891 | return ret; |
5892 | } | |
5893 | ||
d88aee68 DG |
5894 | /* |
5895 | * Add event to the UST channel registry. When the event is added to the | |
5896 | * registry, the metadata is also created. Once done, this replies to the | |
5897 | * application with the appropriate error code. | |
5898 | * | |
5899 | * The session UST registry lock is acquired in the function. | |
5900 | * | |
5901 | * On success 0 is returned else a negative value. | |
5902 | */ | |
d0b96690 | 5903 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
2106efa0 PP |
5904 | char *sig, size_t nr_fields, struct ustctl_field *fields, |
5905 | int loglevel_value, char *model_emf_uri) | |
d0b96690 DG |
5906 | { |
5907 | int ret, ret_code; | |
5908 | uint32_t event_id = 0; | |
7972aab2 | 5909 | uint64_t chan_reg_key; |
d0b96690 DG |
5910 | struct ust_app *app; |
5911 | struct ust_app_channel *ua_chan; | |
5912 | struct ust_app_session *ua_sess; | |
7972aab2 | 5913 | struct ust_registry_session *registry; |
d0b96690 DG |
5914 | |
5915 | rcu_read_lock(); | |
5916 | ||
5917 | /* Lookup application. If not found, there is a code flow error. */ | |
5918 | app = find_app_by_notify_sock(sock); | |
d88aee68 | 5919 | if (!app) { |
fad1ed2f | 5920 | DBG("Application socket %d is being torn down. Abort event notify", |
d88aee68 DG |
5921 | sock); |
5922 | ret = 0; | |
5923 | goto error_rcu_unlock; | |
5924 | } | |
d0b96690 | 5925 | |
4950b860 | 5926 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 5927 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 | 5928 | if (!ua_chan) { |
fad1ed2f | 5929 | DBG("Application channel is being torn down. Abort event notify"); |
4950b860 MD |
5930 | ret = 0; |
5931 | goto error_rcu_unlock; | |
5932 | } | |
5933 | ||
d0b96690 DG |
5934 | assert(ua_chan->session); |
5935 | ua_sess = ua_chan->session; | |
5936 | ||
7972aab2 | 5937 | registry = get_session_registry(ua_sess); |
fad1ed2f JR |
5938 | if (!registry) { |
5939 | DBG("Application session is being torn down. Abort event notify"); | |
5940 | ret = 0; | |
5941 | goto error_rcu_unlock; | |
5942 | } | |
7972aab2 DG |
5943 | |
5944 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
5945 | chan_reg_key = ua_chan->tracing_channel_id; | |
5946 | } else { | |
5947 | chan_reg_key = ua_chan->key; | |
5948 | } | |
5949 | ||
5950 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 5951 | |
d5d629b5 DG |
5952 | /* |
5953 | * From this point on, this call acquires the ownership of the sig, fields | |
5954 | * and model_emf_uri meaning any free are done inside it if needed. These | |
5955 | * three variables MUST NOT be read/write after this. | |
5956 | */ | |
7972aab2 | 5957 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
2106efa0 PP |
5958 | sobjd, cobjd, name, sig, nr_fields, fields, |
5959 | loglevel_value, model_emf_uri, ua_sess->buffer_type, | |
5960 | &event_id, app); | |
fad1ed2f JR |
5961 | sig = NULL; |
5962 | fields = NULL; | |
5963 | model_emf_uri = NULL; | |
d0b96690 DG |
5964 | |
5965 | /* | |
5966 | * The return value is returned to ustctl so in case of an error, the | |
5967 | * application can be notified. In case of an error, it's important not to | |
5968 | * return a negative error or else the application will get closed. | |
5969 | */ | |
5970 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
5971 | if (ret < 0) { | |
5972 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5973 | ERR("UST app reply event failed with ret %d", ret); | |
5974 | } else { | |
5975 | DBG3("UST app reply event failed. Application died"); | |
5976 | } | |
5977 | /* | |
5978 | * No need to wipe the create event since the application socket will | |
5979 | * get close on error hence cleaning up everything by itself. | |
5980 | */ | |
5981 | goto error; | |
5982 | } | |
5983 | ||
7972aab2 DG |
5984 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
5985 | name, event_id); | |
d88aee68 | 5986 | |
d0b96690 | 5987 | error: |
7972aab2 | 5988 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 5989 | error_rcu_unlock: |
d0b96690 | 5990 | rcu_read_unlock(); |
fad1ed2f JR |
5991 | free(sig); |
5992 | free(fields); | |
5993 | free(model_emf_uri); | |
d0b96690 DG |
5994 | return ret; |
5995 | } | |
5996 | ||
10b56aef MD |
5997 | /* |
5998 | * Add enum to the UST session registry. Once done, this replies to the | |
5999 | * application with the appropriate error code. | |
6000 | * | |
6001 | * The session UST registry lock is acquired within this function. | |
6002 | * | |
6003 | * On success 0 is returned else a negative value. | |
6004 | */ | |
6005 | static int add_enum_ust_registry(int sock, int sobjd, char *name, | |
6006 | struct ustctl_enum_entry *entries, size_t nr_entries) | |
6007 | { | |
6008 | int ret = 0, ret_code; | |
6009 | struct ust_app *app; | |
6010 | struct ust_app_session *ua_sess; | |
6011 | struct ust_registry_session *registry; | |
6012 | uint64_t enum_id = -1ULL; | |
6013 | ||
6014 | rcu_read_lock(); | |
6015 | ||
6016 | /* Lookup application. If not found, there is a code flow error. */ | |
6017 | app = find_app_by_notify_sock(sock); | |
6018 | if (!app) { | |
6019 | /* Return an error since this is not an error */ | |
6020 | DBG("Application socket %d is being torn down. Aborting enum registration", | |
6021 | sock); | |
6022 | free(entries); | |
6023 | goto error_rcu_unlock; | |
6024 | } | |
6025 | ||
6026 | /* Lookup session by UST object descriptor. */ | |
6027 | ua_sess = find_session_by_objd(app, sobjd); | |
6028 | if (!ua_sess) { | |
6029 | /* Return an error since this is not an error */ | |
fad1ed2f | 6030 | DBG("Application session is being torn down (session not found). Aborting enum registration."); |
10b56aef MD |
6031 | free(entries); |
6032 | goto error_rcu_unlock; | |
6033 | } | |
6034 | ||
6035 | registry = get_session_registry(ua_sess); | |
fad1ed2f JR |
6036 | if (!registry) { |
6037 | DBG("Application session is being torn down (registry not found). Aborting enum registration."); | |
6038 | free(entries); | |
6039 | goto error_rcu_unlock; | |
6040 | } | |
10b56aef MD |
6041 | |
6042 | pthread_mutex_lock(®istry->lock); | |
6043 | ||
6044 | /* | |
6045 | * From this point on, the callee acquires the ownership of | |
6046 | * entries. The variable entries MUST NOT be read/written after | |
6047 | * call. | |
6048 | */ | |
6049 | ret_code = ust_registry_create_or_find_enum(registry, sobjd, name, | |
6050 | entries, nr_entries, &enum_id); | |
6051 | entries = NULL; | |
6052 | ||
6053 | /* | |
6054 | * The return value is returned to ustctl so in case of an error, the | |
6055 | * application can be notified. In case of an error, it's important not to | |
6056 | * return a negative error or else the application will get closed. | |
6057 | */ | |
6058 | ret = ustctl_reply_register_enum(sock, enum_id, ret_code); | |
6059 | if (ret < 0) { | |
6060 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6061 | ERR("UST app reply enum failed with ret %d", ret); | |
6062 | } else { | |
6063 | DBG3("UST app reply enum failed. Application died"); | |
6064 | } | |
6065 | /* | |
6066 | * No need to wipe the create enum since the application socket will | |
6067 | * get close on error hence cleaning up everything by itself. | |
6068 | */ | |
6069 | goto error; | |
6070 | } | |
6071 | ||
6072 | DBG3("UST registry enum %s added successfully or already found", name); | |
6073 | ||
6074 | error: | |
6075 | pthread_mutex_unlock(®istry->lock); | |
6076 | error_rcu_unlock: | |
6077 | rcu_read_unlock(); | |
6078 | return ret; | |
6079 | } | |
6080 | ||
d88aee68 DG |
6081 | /* |
6082 | * Handle application notification through the given notify socket. | |
6083 | * | |
6084 | * Return 0 on success or else a negative value. | |
6085 | */ | |
d0b96690 DG |
6086 | int ust_app_recv_notify(int sock) |
6087 | { | |
6088 | int ret; | |
6089 | enum ustctl_notify_cmd cmd; | |
6090 | ||
6091 | DBG3("UST app receiving notify from sock %d", sock); | |
6092 | ||
6093 | ret = ustctl_recv_notify(sock, &cmd); | |
6094 | if (ret < 0) { | |
6095 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6096 | ERR("UST app recv notify failed with ret %d", ret); | |
6097 | } else { | |
6098 | DBG3("UST app recv notify failed. Application died"); | |
6099 | } | |
6100 | goto error; | |
6101 | } | |
6102 | ||
6103 | switch (cmd) { | |
6104 | case USTCTL_NOTIFY_CMD_EVENT: | |
6105 | { | |
2106efa0 | 6106 | int sobjd, cobjd, loglevel_value; |
d0b96690 DG |
6107 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; |
6108 | size_t nr_fields; | |
6109 | struct ustctl_field *fields; | |
6110 | ||
6111 | DBG2("UST app ustctl register event received"); | |
6112 | ||
2106efa0 PP |
6113 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, |
6114 | &loglevel_value, &sig, &nr_fields, &fields, | |
6115 | &model_emf_uri); | |
d0b96690 DG |
6116 | if (ret < 0) { |
6117 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6118 | ERR("UST app recv event failed with ret %d", ret); | |
6119 | } else { | |
6120 | DBG3("UST app recv event failed. Application died"); | |
6121 | } | |
6122 | goto error; | |
6123 | } | |
6124 | ||
d5d629b5 DG |
6125 | /* |
6126 | * Add event to the UST registry coming from the notify socket. This | |
6127 | * call will free if needed the sig, fields and model_emf_uri. This | |
6128 | * code path loses the ownsership of these variables and transfer them | |
6129 | * to the this function. | |
6130 | */ | |
d0b96690 | 6131 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
2106efa0 | 6132 | fields, loglevel_value, model_emf_uri); |
d0b96690 DG |
6133 | if (ret < 0) { |
6134 | goto error; | |
6135 | } | |
6136 | ||
6137 | break; | |
6138 | } | |
6139 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
6140 | { | |
6141 | int sobjd, cobjd; | |
6142 | size_t nr_fields; | |
6143 | struct ustctl_field *fields; | |
6144 | ||
6145 | DBG2("UST app ustctl register channel received"); | |
6146 | ||
6147 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
6148 | &fields); | |
6149 | if (ret < 0) { | |
6150 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6151 | ERR("UST app recv channel failed with ret %d", ret); | |
6152 | } else { | |
6153 | DBG3("UST app recv channel failed. Application died"); | |
6154 | } | |
6155 | goto error; | |
6156 | } | |
6157 | ||
d5d629b5 DG |
6158 | /* |
6159 | * The fields ownership are transfered to this function call meaning | |
6160 | * that if needed it will be freed. After this, it's invalid to access | |
6161 | * fields or clean it up. | |
6162 | */ | |
8eede835 | 6163 | ret = reply_ust_register_channel(sock, cobjd, nr_fields, |
d0b96690 DG |
6164 | fields); |
6165 | if (ret < 0) { | |
6166 | goto error; | |
6167 | } | |
6168 | ||
6169 | break; | |
6170 | } | |
10b56aef MD |
6171 | case USTCTL_NOTIFY_CMD_ENUM: |
6172 | { | |
6173 | int sobjd; | |
6174 | char name[LTTNG_UST_SYM_NAME_LEN]; | |
6175 | size_t nr_entries; | |
6176 | struct ustctl_enum_entry *entries; | |
6177 | ||
6178 | DBG2("UST app ustctl register enum received"); | |
6179 | ||
6180 | ret = ustctl_recv_register_enum(sock, &sobjd, name, | |
6181 | &entries, &nr_entries); | |
6182 | if (ret < 0) { | |
6183 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6184 | ERR("UST app recv enum failed with ret %d", ret); | |
6185 | } else { | |
6186 | DBG3("UST app recv enum failed. Application died"); | |
6187 | } | |
6188 | goto error; | |
6189 | } | |
6190 | ||
6191 | /* Callee assumes ownership of entries */ | |
6192 | ret = add_enum_ust_registry(sock, sobjd, name, | |
6193 | entries, nr_entries); | |
6194 | if (ret < 0) { | |
6195 | goto error; | |
6196 | } | |
6197 | ||
6198 | break; | |
6199 | } | |
d0b96690 DG |
6200 | default: |
6201 | /* Should NEVER happen. */ | |
6202 | assert(0); | |
6203 | } | |
6204 | ||
6205 | error: | |
6206 | return ret; | |
6207 | } | |
d88aee68 DG |
6208 | |
6209 | /* | |
6210 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
6211 | * corresponding application. On failure, the call_rcu to close the socket is | |
6212 | * executed. If an application is found, it tries to delete it from the notify | |
6213 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
6214 | * | |
6215 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
6216 | * call RCU is not done but the rest of the cleanup is. | |
6217 | */ | |
6218 | void ust_app_notify_sock_unregister(int sock) | |
6219 | { | |
6220 | int err_enomem = 0; | |
6221 | struct lttng_ht_iter iter; | |
6222 | struct ust_app *app; | |
6223 | struct ust_app_notify_sock_obj *obj; | |
6224 | ||
6225 | assert(sock >= 0); | |
6226 | ||
6227 | rcu_read_lock(); | |
6228 | ||
6229 | obj = zmalloc(sizeof(*obj)); | |
6230 | if (!obj) { | |
6231 | /* | |
6232 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
6233 | * procedure but the call_rcu will not be called. In this case, we | |
6234 | * accept the fd leak rather than possibly creating an unsynchronized | |
6235 | * state between threads. | |
6236 | * | |
6237 | * TODO: The notify object should be created once the notify socket is | |
6238 | * registered and stored independantely from the ust app object. The | |
6239 | * tricky part is to synchronize the teardown of the application and | |
6240 | * this notify object. Let's keep that in mind so we can avoid this | |
6241 | * kind of shenanigans with ENOMEM in the teardown path. | |
6242 | */ | |
6243 | err_enomem = 1; | |
6244 | } else { | |
6245 | obj->fd = sock; | |
6246 | } | |
6247 | ||
6248 | DBG("UST app notify socket unregister %d", sock); | |
6249 | ||
6250 | /* | |
6251 | * Lookup application by notify socket. If this fails, this means that the | |
6252 | * hash table delete has already been done by the application | |
6253 | * unregistration process so we can safely close the notify socket in a | |
6254 | * call RCU. | |
6255 | */ | |
6256 | app = find_app_by_notify_sock(sock); | |
6257 | if (!app) { | |
6258 | goto close_socket; | |
6259 | } | |
6260 | ||
6261 | iter.iter.node = &app->notify_sock_n.node; | |
6262 | ||
6263 | /* | |
6264 | * Whatever happens here either we fail or succeed, in both cases we have | |
6265 | * to close the socket after a grace period to continue to the call RCU | |
6266 | * here. If the deletion is successful, the application is not visible | |
6267 | * anymore by other threads and is it fails it means that it was already | |
6268 | * deleted from the hash table so either way we just have to close the | |
6269 | * socket. | |
6270 | */ | |
6271 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
6272 | ||
6273 | close_socket: | |
6274 | rcu_read_unlock(); | |
6275 | ||
6276 | /* | |
6277 | * Close socket after a grace period to avoid for the socket to be reused | |
6278 | * before the application object is freed creating potential race between | |
6279 | * threads trying to add unique in the global hash table. | |
6280 | */ | |
6281 | if (!err_enomem) { | |
6282 | call_rcu(&obj->head, close_notify_sock_rcu); | |
6283 | } | |
6284 | } | |
f45e313d DG |
6285 | |
6286 | /* | |
6287 | * Destroy a ust app data structure and free its memory. | |
6288 | */ | |
6289 | void ust_app_destroy(struct ust_app *app) | |
6290 | { | |
6291 | if (!app) { | |
6292 | return; | |
6293 | } | |
6294 | ||
6295 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
6296 | } | |
6dc3064a DG |
6297 | |
6298 | /* | |
6299 | * Take a snapshot for a given UST session. The snapshot is sent to the given | |
6300 | * output. | |
6301 | * | |
9a654598 | 6302 | * Returns LTTNG_OK on success or a LTTNG_ERR error code. |
6dc3064a | 6303 | */ |
fb9a95c4 JG |
6304 | enum lttng_error_code ust_app_snapshot_record( |
6305 | const struct ltt_ust_session *usess, | |
348a81dc | 6306 | const struct consumer_output *output, int wait, |
d07ceecd | 6307 | uint64_t nb_packets_per_stream) |
6dc3064a DG |
6308 | { |
6309 | int ret = 0; | |
9a654598 | 6310 | enum lttng_error_code status = LTTNG_OK; |
6dc3064a DG |
6311 | struct lttng_ht_iter iter; |
6312 | struct ust_app *app; | |
affce97e | 6313 | char *trace_path = NULL; |
6dc3064a DG |
6314 | |
6315 | assert(usess); | |
6316 | assert(output); | |
6317 | ||
6318 | rcu_read_lock(); | |
6319 | ||
8c924c7b MD |
6320 | switch (usess->buffer_type) { |
6321 | case LTTNG_BUFFER_PER_UID: | |
6322 | { | |
6323 | struct buffer_reg_uid *reg; | |
6dc3064a | 6324 | |
8c924c7b MD |
6325 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
6326 | struct buffer_reg_channel *reg_chan; | |
6327 | struct consumer_socket *socket; | |
3b967712 | 6328 | char pathname[PATH_MAX]; |
5da88b0f | 6329 | size_t consumer_path_offset = 0; |
6dc3064a | 6330 | |
2b269489 JR |
6331 | if (!reg->registry->reg.ust->metadata_key) { |
6332 | /* Skip since no metadata is present */ | |
6333 | continue; | |
6334 | } | |
6335 | ||
8c924c7b MD |
6336 | /* Get consumer socket to use to push the metadata.*/ |
6337 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
6338 | usess->consumer); | |
6339 | if (!socket) { | |
9a654598 | 6340 | status = LTTNG_ERR_INVALID; |
8c924c7b MD |
6341 | goto error; |
6342 | } | |
6dc3064a | 6343 | |
8c924c7b MD |
6344 | memset(pathname, 0, sizeof(pathname)); |
6345 | ret = snprintf(pathname, sizeof(pathname), | |
5da88b0f | 6346 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH, |
8c924c7b MD |
6347 | reg->uid, reg->bits_per_long); |
6348 | if (ret < 0) { | |
6349 | PERROR("snprintf snapshot path"); | |
9a654598 | 6350 | status = LTTNG_ERR_INVALID; |
8c924c7b MD |
6351 | goto error; |
6352 | } | |
affce97e JG |
6353 | /* Free path allowed on previous iteration. */ |
6354 | free(trace_path); | |
5da88b0f MD |
6355 | trace_path = setup_channel_trace_path(usess->consumer, pathname, |
6356 | &consumer_path_offset); | |
3b967712 MD |
6357 | if (!trace_path) { |
6358 | status = LTTNG_ERR_INVALID; | |
6359 | goto error; | |
6360 | } | |
d2956687 | 6361 | /* Add the UST default trace dir to path. */ |
8c924c7b MD |
6362 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
6363 | reg_chan, node.node) { | |
9a654598 | 6364 | status = consumer_snapshot_channel(socket, |
e098433c JG |
6365 | reg_chan->consumer_key, |
6366 | output, 0, usess->uid, | |
5da88b0f | 6367 | usess->gid, &trace_path[consumer_path_offset], wait, |
d2956687 | 6368 | nb_packets_per_stream); |
9a654598 | 6369 | if (status != LTTNG_OK) { |
8c924c7b MD |
6370 | goto error; |
6371 | } | |
6372 | } | |
9a654598 | 6373 | status = consumer_snapshot_channel(socket, |
68808f4e | 6374 | reg->registry->reg.ust->metadata_key, output, 1, |
5da88b0f MD |
6375 | usess->uid, usess->gid, &trace_path[consumer_path_offset], |
6376 | wait, 0); | |
9a654598 | 6377 | if (status != LTTNG_OK) { |
8c924c7b MD |
6378 | goto error; |
6379 | } | |
af706bb7 | 6380 | } |
8c924c7b MD |
6381 | break; |
6382 | } | |
6383 | case LTTNG_BUFFER_PER_PID: | |
6384 | { | |
6385 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6386 | struct consumer_socket *socket; | |
6387 | struct lttng_ht_iter chan_iter; | |
6388 | struct ust_app_channel *ua_chan; | |
6389 | struct ust_app_session *ua_sess; | |
6390 | struct ust_registry_session *registry; | |
3b967712 | 6391 | char pathname[PATH_MAX]; |
5da88b0f | 6392 | size_t consumer_path_offset = 0; |
8c924c7b MD |
6393 | |
6394 | ua_sess = lookup_session_by_app(usess, app); | |
6395 | if (!ua_sess) { | |
6396 | /* Session not associated with this app. */ | |
6397 | continue; | |
6398 | } | |
af706bb7 | 6399 | |
8c924c7b MD |
6400 | /* Get the right consumer socket for the application. */ |
6401 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
348a81dc | 6402 | output); |
8c924c7b | 6403 | if (!socket) { |
9a654598 | 6404 | status = LTTNG_ERR_INVALID; |
5c786ded JD |
6405 | goto error; |
6406 | } | |
6407 | ||
8c924c7b MD |
6408 | /* Add the UST default trace dir to path. */ |
6409 | memset(pathname, 0, sizeof(pathname)); | |
5da88b0f | 6410 | ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "/%s", |
8c924c7b | 6411 | ua_sess->path); |
6dc3064a | 6412 | if (ret < 0) { |
9a654598 | 6413 | status = LTTNG_ERR_INVALID; |
8c924c7b | 6414 | PERROR("snprintf snapshot path"); |
6dc3064a DG |
6415 | goto error; |
6416 | } | |
affce97e JG |
6417 | /* Free path allowed on previous iteration. */ |
6418 | free(trace_path); | |
5da88b0f MD |
6419 | trace_path = setup_channel_trace_path(usess->consumer, pathname, |
6420 | &consumer_path_offset); | |
3b967712 MD |
6421 | if (!trace_path) { |
6422 | status = LTTNG_ERR_INVALID; | |
6423 | goto error; | |
6424 | } | |
d2956687 | 6425 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, |
8c924c7b | 6426 | ua_chan, node.node) { |
9a654598 | 6427 | status = consumer_snapshot_channel(socket, |
470cc211 JG |
6428 | ua_chan->key, output, 0, |
6429 | ua_sess->effective_credentials | |
6430 | .uid, | |
6431 | ua_sess->effective_credentials | |
6432 | .gid, | |
5da88b0f | 6433 | &trace_path[consumer_path_offset], wait, |
d2956687 | 6434 | nb_packets_per_stream); |
9a654598 JG |
6435 | switch (status) { |
6436 | case LTTNG_OK: | |
6437 | break; | |
6438 | case LTTNG_ERR_CHAN_NOT_FOUND: | |
6439 | continue; | |
6440 | default: | |
8c924c7b MD |
6441 | goto error; |
6442 | } | |
6443 | } | |
6444 | ||
6445 | registry = get_session_registry(ua_sess); | |
fad1ed2f | 6446 | if (!registry) { |
9bbfb88c MD |
6447 | DBG("Application session is being torn down. Skip application."); |
6448 | continue; | |
fad1ed2f | 6449 | } |
9a654598 | 6450 | status = consumer_snapshot_channel(socket, |
470cc211 JG |
6451 | registry->metadata_key, output, 1, |
6452 | ua_sess->effective_credentials.uid, | |
6453 | ua_sess->effective_credentials.gid, | |
5da88b0f | 6454 | &trace_path[consumer_path_offset], wait, 0); |
9a654598 JG |
6455 | switch (status) { |
6456 | case LTTNG_OK: | |
6457 | break; | |
6458 | case LTTNG_ERR_CHAN_NOT_FOUND: | |
6459 | continue; | |
6460 | default: | |
8c924c7b MD |
6461 | goto error; |
6462 | } | |
6463 | } | |
6464 | break; | |
6465 | } | |
6466 | default: | |
6467 | assert(0); | |
6468 | break; | |
6dc3064a DG |
6469 | } |
6470 | ||
6471 | error: | |
affce97e | 6472 | free(trace_path); |
6dc3064a | 6473 | rcu_read_unlock(); |
9a654598 | 6474 | return status; |
6dc3064a | 6475 | } |
5c786ded JD |
6476 | |
6477 | /* | |
d07ceecd | 6478 | * Return the size taken by one more packet per stream. |
5c786ded | 6479 | */ |
fb9a95c4 JG |
6480 | uint64_t ust_app_get_size_one_more_packet_per_stream( |
6481 | const struct ltt_ust_session *usess, uint64_t cur_nr_packets) | |
5c786ded | 6482 | { |
d07ceecd | 6483 | uint64_t tot_size = 0; |
5c786ded JD |
6484 | struct ust_app *app; |
6485 | struct lttng_ht_iter iter; | |
6486 | ||
6487 | assert(usess); | |
6488 | ||
6489 | switch (usess->buffer_type) { | |
6490 | case LTTNG_BUFFER_PER_UID: | |
6491 | { | |
6492 | struct buffer_reg_uid *reg; | |
6493 | ||
6494 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
6495 | struct buffer_reg_channel *reg_chan; | |
6496 | ||
b7064eaa | 6497 | rcu_read_lock(); |
5c786ded JD |
6498 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
6499 | reg_chan, node.node) { | |
d07ceecd MD |
6500 | if (cur_nr_packets >= reg_chan->num_subbuf) { |
6501 | /* | |
6502 | * Don't take channel into account if we | |
6503 | * already grab all its packets. | |
6504 | */ | |
6505 | continue; | |
6506 | } | |
6507 | tot_size += reg_chan->subbuf_size * reg_chan->stream_count; | |
5c786ded | 6508 | } |
b7064eaa | 6509 | rcu_read_unlock(); |
5c786ded JD |
6510 | } |
6511 | break; | |
6512 | } | |
6513 | case LTTNG_BUFFER_PER_PID: | |
6514 | { | |
6515 | rcu_read_lock(); | |
6516 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6517 | struct ust_app_channel *ua_chan; | |
6518 | struct ust_app_session *ua_sess; | |
6519 | struct lttng_ht_iter chan_iter; | |
6520 | ||
6521 | ua_sess = lookup_session_by_app(usess, app); | |
6522 | if (!ua_sess) { | |
6523 | /* Session not associated with this app. */ | |
6524 | continue; | |
6525 | } | |
6526 | ||
6527 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
6528 | ua_chan, node.node) { | |
d07ceecd MD |
6529 | if (cur_nr_packets >= ua_chan->attr.num_subbuf) { |
6530 | /* | |
6531 | * Don't take channel into account if we | |
6532 | * already grab all its packets. | |
6533 | */ | |
6534 | continue; | |
6535 | } | |
6536 | tot_size += ua_chan->attr.subbuf_size * ua_chan->streams.count; | |
5c786ded JD |
6537 | } |
6538 | } | |
6539 | rcu_read_unlock(); | |
6540 | break; | |
6541 | } | |
6542 | default: | |
6543 | assert(0); | |
6544 | break; | |
6545 | } | |
6546 | ||
d07ceecd | 6547 | return tot_size; |
5c786ded | 6548 | } |
fb83fe64 JD |
6549 | |
6550 | int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id, | |
6551 | struct cds_list_head *buffer_reg_uid_list, | |
6552 | struct consumer_output *consumer, uint64_t uchan_id, | |
6553 | int overwrite, uint64_t *discarded, uint64_t *lost) | |
6554 | { | |
6555 | int ret; | |
6556 | uint64_t consumer_chan_key; | |
6557 | ||
70dd8162 MD |
6558 | *discarded = 0; |
6559 | *lost = 0; | |
6560 | ||
fb83fe64 | 6561 | ret = buffer_reg_uid_consumer_channel_key( |
76604852 | 6562 | buffer_reg_uid_list, uchan_id, &consumer_chan_key); |
fb83fe64 | 6563 | if (ret < 0) { |
70dd8162 MD |
6564 | /* Not found */ |
6565 | ret = 0; | |
fb83fe64 JD |
6566 | goto end; |
6567 | } | |
6568 | ||
6569 | if (overwrite) { | |
6570 | ret = consumer_get_lost_packets(ust_session_id, | |
6571 | consumer_chan_key, consumer, lost); | |
6572 | } else { | |
6573 | ret = consumer_get_discarded_events(ust_session_id, | |
6574 | consumer_chan_key, consumer, discarded); | |
6575 | } | |
6576 | ||
6577 | end: | |
6578 | return ret; | |
6579 | } | |
6580 | ||
6581 | int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess, | |
6582 | struct ltt_ust_channel *uchan, | |
6583 | struct consumer_output *consumer, int overwrite, | |
6584 | uint64_t *discarded, uint64_t *lost) | |
6585 | { | |
6586 | int ret = 0; | |
6587 | struct lttng_ht_iter iter; | |
6588 | struct lttng_ht_node_str *ua_chan_node; | |
6589 | struct ust_app *app; | |
6590 | struct ust_app_session *ua_sess; | |
6591 | struct ust_app_channel *ua_chan; | |
6592 | ||
70dd8162 MD |
6593 | *discarded = 0; |
6594 | *lost = 0; | |
6595 | ||
fb83fe64 JD |
6596 | rcu_read_lock(); |
6597 | /* | |
70dd8162 MD |
6598 | * Iterate over every registered applications. Sum counters for |
6599 | * all applications containing requested session and channel. | |
fb83fe64 JD |
6600 | */ |
6601 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6602 | struct lttng_ht_iter uiter; | |
6603 | ||
6604 | ua_sess = lookup_session_by_app(usess, app); | |
6605 | if (ua_sess == NULL) { | |
6606 | continue; | |
6607 | } | |
6608 | ||
6609 | /* Get channel */ | |
ee022399 | 6610 | lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &uiter); |
fb83fe64 JD |
6611 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); |
6612 | /* If the session is found for the app, the channel must be there */ | |
6613 | assert(ua_chan_node); | |
6614 | ||
6615 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
6616 | ||
6617 | if (overwrite) { | |
70dd8162 MD |
6618 | uint64_t _lost; |
6619 | ||
fb83fe64 | 6620 | ret = consumer_get_lost_packets(usess->id, ua_chan->key, |
70dd8162 MD |
6621 | consumer, &_lost); |
6622 | if (ret < 0) { | |
6623 | break; | |
6624 | } | |
6625 | (*lost) += _lost; | |
fb83fe64 | 6626 | } else { |
70dd8162 MD |
6627 | uint64_t _discarded; |
6628 | ||
fb83fe64 | 6629 | ret = consumer_get_discarded_events(usess->id, |
70dd8162 MD |
6630 | ua_chan->key, consumer, &_discarded); |
6631 | if (ret < 0) { | |
6632 | break; | |
6633 | } | |
6634 | (*discarded) += _discarded; | |
fb83fe64 | 6635 | } |
fb83fe64 JD |
6636 | } |
6637 | ||
fb83fe64 JD |
6638 | rcu_read_unlock(); |
6639 | return ret; | |
6640 | } | |
c2561365 JD |
6641 | |
6642 | static | |
6643 | int ust_app_regenerate_statedump(struct ltt_ust_session *usess, | |
6644 | struct ust_app *app) | |
6645 | { | |
6646 | int ret = 0; | |
6647 | struct ust_app_session *ua_sess; | |
6648 | ||
6649 | DBG("Regenerating the metadata for ust app pid %d", app->pid); | |
6650 | ||
6651 | rcu_read_lock(); | |
6652 | ||
6653 | ua_sess = lookup_session_by_app(usess, app); | |
6654 | if (ua_sess == NULL) { | |
6655 | /* The session is in teardown process. Ignore and continue. */ | |
6656 | goto end; | |
6657 | } | |
6658 | ||
6659 | pthread_mutex_lock(&ua_sess->lock); | |
6660 | ||
6661 | if (ua_sess->deleted) { | |
6662 | goto end_unlock; | |
6663 | } | |
6664 | ||
6665 | pthread_mutex_lock(&app->sock_lock); | |
6666 | ret = ustctl_regenerate_statedump(app->sock, ua_sess->handle); | |
6667 | pthread_mutex_unlock(&app->sock_lock); | |
6668 | ||
6669 | end_unlock: | |
6670 | pthread_mutex_unlock(&ua_sess->lock); | |
6671 | ||
6672 | end: | |
6673 | rcu_read_unlock(); | |
6674 | health_code_update(); | |
6675 | return ret; | |
6676 | } | |
6677 | ||
6678 | /* | |
6679 | * Regenerate the statedump for each app in the session. | |
6680 | */ | |
6681 | int ust_app_regenerate_statedump_all(struct ltt_ust_session *usess) | |
6682 | { | |
6683 | int ret = 0; | |
6684 | struct lttng_ht_iter iter; | |
6685 | struct ust_app *app; | |
6686 | ||
6687 | DBG("Regenerating the metadata for all UST apps"); | |
6688 | ||
6689 | rcu_read_lock(); | |
6690 | ||
6691 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6692 | if (!app->compatible) { | |
6693 | continue; | |
6694 | } | |
6695 | ||
6696 | ret = ust_app_regenerate_statedump(usess, app); | |
6697 | if (ret < 0) { | |
6698 | /* Continue to the next app even on error */ | |
6699 | continue; | |
6700 | } | |
6701 | } | |
6702 | ||
6703 | rcu_read_unlock(); | |
6704 | ||
6705 | return 0; | |
6706 | } | |
5c408ad8 JD |
6707 | |
6708 | /* | |
6709 | * Rotate all the channels of a session. | |
6710 | * | |
6f6d3b69 | 6711 | * Return LTTNG_OK on success or else an LTTng error code. |
5c408ad8 | 6712 | */ |
6f6d3b69 | 6713 | enum lttng_error_code ust_app_rotate_session(struct ltt_session *session) |
5c408ad8 | 6714 | { |
6f6d3b69 MD |
6715 | int ret; |
6716 | enum lttng_error_code cmd_ret = LTTNG_OK; | |
5c408ad8 JD |
6717 | struct lttng_ht_iter iter; |
6718 | struct ust_app *app; | |
6719 | struct ltt_ust_session *usess = session->ust_session; | |
5c408ad8 JD |
6720 | |
6721 | assert(usess); | |
6722 | ||
6723 | rcu_read_lock(); | |
6724 | ||
6725 | switch (usess->buffer_type) { | |
6726 | case LTTNG_BUFFER_PER_UID: | |
6727 | { | |
6728 | struct buffer_reg_uid *reg; | |
6729 | ||
6730 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
6731 | struct buffer_reg_channel *reg_chan; | |
6732 | struct consumer_socket *socket; | |
6733 | ||
14d3fca9 JR |
6734 | if (!reg->registry->reg.ust->metadata_key) { |
6735 | /* Skip since no metadata is present */ | |
6736 | continue; | |
6737 | } | |
6738 | ||
5c408ad8 JD |
6739 | /* Get consumer socket to use to push the metadata.*/ |
6740 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
6741 | usess->consumer); | |
6742 | if (!socket) { | |
6f6d3b69 | 6743 | cmd_ret = LTTNG_ERR_INVALID; |
5c408ad8 JD |
6744 | goto error; |
6745 | } | |
6746 | ||
5c408ad8 JD |
6747 | /* Rotate the data channels. */ |
6748 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
6749 | reg_chan, node.node) { | |
5c408ad8 JD |
6750 | ret = consumer_rotate_channel(socket, |
6751 | reg_chan->consumer_key, | |
6752 | usess->uid, usess->gid, | |
d2956687 JG |
6753 | usess->consumer, |
6754 | /* is_metadata_channel */ false); | |
5c408ad8 | 6755 | if (ret < 0) { |
6f6d3b69 | 6756 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
6757 | goto error; |
6758 | } | |
6759 | } | |
6760 | ||
6761 | (void) push_metadata(reg->registry->reg.ust, usess->consumer); | |
6762 | ||
6763 | ret = consumer_rotate_channel(socket, | |
6764 | reg->registry->reg.ust->metadata_key, | |
6765 | usess->uid, usess->gid, | |
d2956687 JG |
6766 | usess->consumer, |
6767 | /* is_metadata_channel */ true); | |
5c408ad8 | 6768 | if (ret < 0) { |
6f6d3b69 | 6769 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
6770 | goto error; |
6771 | } | |
5c408ad8 JD |
6772 | } |
6773 | break; | |
6774 | } | |
6775 | case LTTNG_BUFFER_PER_PID: | |
6776 | { | |
6777 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6778 | struct consumer_socket *socket; | |
6779 | struct lttng_ht_iter chan_iter; | |
6780 | struct ust_app_channel *ua_chan; | |
6781 | struct ust_app_session *ua_sess; | |
6782 | struct ust_registry_session *registry; | |
6783 | ||
6784 | ua_sess = lookup_session_by_app(usess, app); | |
6785 | if (!ua_sess) { | |
6786 | /* Session not associated with this app. */ | |
6787 | continue; | |
6788 | } | |
5c408ad8 JD |
6789 | |
6790 | /* Get the right consumer socket for the application. */ | |
6791 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
6792 | usess->consumer); | |
6793 | if (!socket) { | |
6f6d3b69 | 6794 | cmd_ret = LTTNG_ERR_INVALID; |
5c408ad8 JD |
6795 | goto error; |
6796 | } | |
6797 | ||
6798 | registry = get_session_registry(ua_sess); | |
6799 | if (!registry) { | |
6f6d3b69 MD |
6800 | DBG("Application session is being torn down. Skip application."); |
6801 | continue; | |
5c408ad8 JD |
6802 | } |
6803 | ||
5c408ad8 JD |
6804 | /* Rotate the data channels. */ |
6805 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
6806 | ua_chan, node.node) { | |
470cc211 JG |
6807 | ret = consumer_rotate_channel(socket, |
6808 | ua_chan->key, | |
6809 | ua_sess->effective_credentials | |
6810 | .uid, | |
6811 | ua_sess->effective_credentials | |
6812 | .gid, | |
d2956687 JG |
6813 | ua_sess->consumer, |
6814 | /* is_metadata_channel */ false); | |
5c408ad8 | 6815 | if (ret < 0) { |
6f6d3b69 MD |
6816 | /* Per-PID buffer and application going away. */ |
6817 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) | |
6818 | continue; | |
6819 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; | |
5c408ad8 JD |
6820 | goto error; |
6821 | } | |
6822 | } | |
6823 | ||
6824 | /* Rotate the metadata channel. */ | |
6825 | (void) push_metadata(registry, usess->consumer); | |
470cc211 JG |
6826 | ret = consumer_rotate_channel(socket, |
6827 | registry->metadata_key, | |
6828 | ua_sess->effective_credentials.uid, | |
6829 | ua_sess->effective_credentials.gid, | |
d2956687 JG |
6830 | ua_sess->consumer, |
6831 | /* is_metadata_channel */ true); | |
5c408ad8 | 6832 | if (ret < 0) { |
6f6d3b69 MD |
6833 | /* Per-PID buffer and application going away. */ |
6834 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) | |
6835 | continue; | |
6836 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; | |
5c408ad8 JD |
6837 | goto error; |
6838 | } | |
5c408ad8 JD |
6839 | } |
6840 | break; | |
6841 | } | |
6842 | default: | |
6843 | assert(0); | |
6844 | break; | |
6845 | } | |
6846 | ||
6f6d3b69 | 6847 | cmd_ret = LTTNG_OK; |
5c408ad8 JD |
6848 | |
6849 | error: | |
6850 | rcu_read_unlock(); | |
6f6d3b69 | 6851 | return cmd_ret; |
5c408ad8 | 6852 | } |
d2956687 JG |
6853 | |
6854 | enum lttng_error_code ust_app_create_channel_subdirectories( | |
6855 | const struct ltt_ust_session *usess) | |
6856 | { | |
6857 | enum lttng_error_code ret = LTTNG_OK; | |
6858 | struct lttng_ht_iter iter; | |
6859 | enum lttng_trace_chunk_status chunk_status; | |
6860 | char *pathname_index; | |
6861 | int fmt_ret; | |
6862 | ||
6863 | assert(usess->current_trace_chunk); | |
6864 | rcu_read_lock(); | |
6865 | ||
6866 | switch (usess->buffer_type) { | |
6867 | case LTTNG_BUFFER_PER_UID: | |
6868 | { | |
6869 | struct buffer_reg_uid *reg; | |
6870 | ||
6871 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
6872 | fmt_ret = asprintf(&pathname_index, | |
5da88b0f | 6873 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH "/" DEFAULT_INDEX_DIR, |
d2956687 JG |
6874 | reg->uid, reg->bits_per_long); |
6875 | if (fmt_ret < 0) { | |
6876 | ERR("Failed to format channel index directory"); | |
6877 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
6878 | goto error; | |
6879 | } | |
6880 | ||
6881 | /* | |
6882 | * Create the index subdirectory which will take care | |
6883 | * of implicitly creating the channel's path. | |
6884 | */ | |
6885 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
6886 | usess->current_trace_chunk, | |
6887 | pathname_index); | |
6888 | free(pathname_index); | |
6889 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
6890 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
6891 | goto error; | |
6892 | } | |
6893 | } | |
6894 | break; | |
6895 | } | |
6896 | case LTTNG_BUFFER_PER_PID: | |
6897 | { | |
6898 | struct ust_app *app; | |
6899 | ||
495dece5 MD |
6900 | /* |
6901 | * Create the toplevel ust/ directory in case no apps are running. | |
6902 | */ | |
6903 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
6904 | usess->current_trace_chunk, | |
6905 | DEFAULT_UST_TRACE_DIR); | |
6906 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
6907 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
6908 | goto error; | |
6909 | } | |
6910 | ||
d2956687 JG |
6911 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, |
6912 | pid_n.node) { | |
6913 | struct ust_app_session *ua_sess; | |
6914 | struct ust_registry_session *registry; | |
6915 | ||
6916 | ua_sess = lookup_session_by_app(usess, app); | |
6917 | if (!ua_sess) { | |
6918 | /* Session not associated with this app. */ | |
6919 | continue; | |
6920 | } | |
6921 | ||
6922 | registry = get_session_registry(ua_sess); | |
6923 | if (!registry) { | |
6924 | DBG("Application session is being torn down. Skip application."); | |
6925 | continue; | |
6926 | } | |
6927 | ||
6928 | fmt_ret = asprintf(&pathname_index, | |
5da88b0f | 6929 | DEFAULT_UST_TRACE_DIR "/%s/" DEFAULT_INDEX_DIR, |
d2956687 JG |
6930 | ua_sess->path); |
6931 | if (fmt_ret < 0) { | |
6932 | ERR("Failed to format channel index directory"); | |
6933 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
6934 | goto error; | |
6935 | } | |
6936 | /* | |
6937 | * Create the index subdirectory which will take care | |
6938 | * of implicitly creating the channel's path. | |
6939 | */ | |
6940 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
6941 | usess->current_trace_chunk, | |
6942 | pathname_index); | |
6943 | free(pathname_index); | |
6944 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
6945 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
6946 | goto error; | |
6947 | } | |
6948 | } | |
6949 | break; | |
6950 | } | |
6951 | default: | |
6952 | abort(); | |
6953 | } | |
6954 | ||
6955 | ret = LTTNG_OK; | |
6956 | error: | |
6957 | rcu_read_unlock(); | |
6958 | return ret; | |
6959 | } | |
4a9b9759 MD |
6960 | |
6961 | /* | |
6962 | * Clear all the channels of a session. | |
6963 | * | |
6964 | * Return LTTNG_OK on success or else an LTTng error code. | |
6965 | */ | |
6966 | enum lttng_error_code ust_app_clear_session(struct ltt_session *session) | |
6967 | { | |
6968 | int ret; | |
6969 | enum lttng_error_code cmd_ret = LTTNG_OK; | |
6970 | struct lttng_ht_iter iter; | |
6971 | struct ust_app *app; | |
6972 | struct ltt_ust_session *usess = session->ust_session; | |
6973 | ||
6974 | assert(usess); | |
6975 | ||
6976 | rcu_read_lock(); | |
6977 | ||
6978 | if (usess->active) { | |
6979 | ERR("Expecting inactive session %s (%" PRIu64 ")", session->name, session->id); | |
6980 | cmd_ret = LTTNG_ERR_FATAL; | |
6981 | goto end; | |
6982 | } | |
6983 | ||
6984 | switch (usess->buffer_type) { | |
6985 | case LTTNG_BUFFER_PER_UID: | |
6986 | { | |
6987 | struct buffer_reg_uid *reg; | |
6988 | ||
6989 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
6990 | struct buffer_reg_channel *reg_chan; | |
6991 | struct consumer_socket *socket; | |
6992 | ||
6993 | /* Get consumer socket to use to push the metadata.*/ | |
6994 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
6995 | usess->consumer); | |
6996 | if (!socket) { | |
6997 | cmd_ret = LTTNG_ERR_INVALID; | |
6998 | goto error_socket; | |
6999 | } | |
7000 | ||
7001 | /* Clear the data channels. */ | |
7002 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
7003 | reg_chan, node.node) { | |
7004 | ret = consumer_clear_channel(socket, | |
7005 | reg_chan->consumer_key); | |
7006 | if (ret < 0) { | |
7007 | goto error; | |
7008 | } | |
7009 | } | |
7010 | ||
7011 | (void) push_metadata(reg->registry->reg.ust, usess->consumer); | |
7012 | ||
7013 | /* | |
7014 | * Clear the metadata channel. | |
7015 | * Metadata channel is not cleared per se but we still need to | |
7016 | * perform a rotation operation on it behind the scene. | |
7017 | */ | |
7018 | ret = consumer_clear_channel(socket, | |
7019 | reg->registry->reg.ust->metadata_key); | |
7020 | if (ret < 0) { | |
7021 | goto error; | |
7022 | } | |
7023 | } | |
7024 | break; | |
7025 | } | |
7026 | case LTTNG_BUFFER_PER_PID: | |
7027 | { | |
7028 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
7029 | struct consumer_socket *socket; | |
7030 | struct lttng_ht_iter chan_iter; | |
7031 | struct ust_app_channel *ua_chan; | |
7032 | struct ust_app_session *ua_sess; | |
7033 | struct ust_registry_session *registry; | |
7034 | ||
7035 | ua_sess = lookup_session_by_app(usess, app); | |
7036 | if (!ua_sess) { | |
7037 | /* Session not associated with this app. */ | |
7038 | continue; | |
7039 | } | |
7040 | ||
7041 | /* Get the right consumer socket for the application. */ | |
7042 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
7043 | usess->consumer); | |
7044 | if (!socket) { | |
7045 | cmd_ret = LTTNG_ERR_INVALID; | |
7046 | goto error_socket; | |
7047 | } | |
7048 | ||
7049 | registry = get_session_registry(ua_sess); | |
7050 | if (!registry) { | |
7051 | DBG("Application session is being torn down. Skip application."); | |
7052 | continue; | |
7053 | } | |
7054 | ||
7055 | /* Clear the data channels. */ | |
7056 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
7057 | ua_chan, node.node) { | |
7058 | ret = consumer_clear_channel(socket, ua_chan->key); | |
7059 | if (ret < 0) { | |
7060 | /* Per-PID buffer and application going away. */ | |
7061 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) { | |
7062 | continue; | |
7063 | } | |
7064 | goto error; | |
7065 | } | |
7066 | } | |
7067 | ||
7068 | (void) push_metadata(registry, usess->consumer); | |
7069 | ||
7070 | /* | |
7071 | * Clear the metadata channel. | |
7072 | * Metadata channel is not cleared per se but we still need to | |
7073 | * perform rotation operation on it behind the scene. | |
7074 | */ | |
7075 | ret = consumer_clear_channel(socket, registry->metadata_key); | |
7076 | if (ret < 0) { | |
7077 | /* Per-PID buffer and application going away. */ | |
7078 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) { | |
7079 | continue; | |
7080 | } | |
7081 | goto error; | |
7082 | } | |
7083 | } | |
7084 | break; | |
7085 | } | |
7086 | default: | |
7087 | assert(0); | |
7088 | break; | |
7089 | } | |
7090 | ||
7091 | cmd_ret = LTTNG_OK; | |
7092 | goto end; | |
7093 | ||
7094 | error: | |
7095 | switch (-ret) { | |
7096 | case LTTCOMM_CONSUMERD_RELAYD_CLEAR_DISALLOWED: | |
7097 | cmd_ret = LTTNG_ERR_CLEAR_RELAY_DISALLOWED; | |
7098 | break; | |
7099 | default: | |
7100 | cmd_ret = LTTNG_ERR_CLEAR_FAIL_CONSUMER; | |
7101 | } | |
7102 | ||
7103 | error_socket: | |
7104 | end: | |
7105 | rcu_read_unlock(); | |
7106 | return cmd_ret; | |
7107 | } |