Commit | Line | Data |
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91d76f53 DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
bdf64013 | 3 | * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
91d76f53 | 4 | * |
d14d33bf AM |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
91d76f53 DG |
8 | * |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
d14d33bf AM |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
91d76f53 DG |
17 | */ |
18 | ||
6c1c0768 | 19 | #define _LGPL_SOURCE |
91d76f53 | 20 | #include <errno.h> |
7972aab2 | 21 | #include <inttypes.h> |
91d76f53 DG |
22 | #include <pthread.h> |
23 | #include <stdio.h> | |
24 | #include <stdlib.h> | |
099e26bd | 25 | #include <string.h> |
aba8e916 DG |
26 | #include <sys/stat.h> |
27 | #include <sys/types.h> | |
099e26bd | 28 | #include <unistd.h> |
0df502fd | 29 | #include <urcu/compiler.h> |
fb54cdbf | 30 | #include <lttng/ust-error.h> |
331744e3 | 31 | #include <signal.h> |
bec39940 | 32 | |
990570ed | 33 | #include <common/common.h> |
86acf0da | 34 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 35 | |
7972aab2 | 36 | #include "buffer-registry.h" |
86acf0da | 37 | #include "fd-limit.h" |
8782cc74 | 38 | #include "health-sessiond.h" |
56fff090 | 39 | #include "ust-app.h" |
48842b30 | 40 | #include "ust-consumer.h" |
d80a6244 | 41 | #include "ust-ctl.h" |
0b2dc8df | 42 | #include "utils.h" |
fb83fe64 | 43 | #include "session.h" |
e9404c27 JG |
44 | #include "lttng-sessiond.h" |
45 | #include "notification-thread-commands.h" | |
5c408ad8 | 46 | #include "rotate.h" |
d80a6244 | 47 | |
c4b88406 MD |
48 | static |
49 | int ust_app_flush_app_session(struct ust_app *app, struct ust_app_session *ua_sess); | |
50 | ||
d9bf3ca4 MD |
51 | /* Next available channel key. Access under next_channel_key_lock. */ |
52 | static uint64_t _next_channel_key; | |
53 | static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER; | |
54 | ||
55 | /* Next available session ID. Access under next_session_id_lock. */ | |
56 | static uint64_t _next_session_id; | |
57 | static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER; | |
ffe60014 DG |
58 | |
59 | /* | |
d9bf3ca4 | 60 | * Return the incremented value of next_channel_key. |
ffe60014 | 61 | */ |
d9bf3ca4 | 62 | static uint64_t get_next_channel_key(void) |
ffe60014 | 63 | { |
d9bf3ca4 MD |
64 | uint64_t ret; |
65 | ||
66 | pthread_mutex_lock(&next_channel_key_lock); | |
67 | ret = ++_next_channel_key; | |
68 | pthread_mutex_unlock(&next_channel_key_lock); | |
69 | return ret; | |
ffe60014 DG |
70 | } |
71 | ||
72 | /* | |
7972aab2 | 73 | * Return the atomically incremented value of next_session_id. |
ffe60014 | 74 | */ |
d9bf3ca4 | 75 | static uint64_t get_next_session_id(void) |
ffe60014 | 76 | { |
d9bf3ca4 MD |
77 | uint64_t ret; |
78 | ||
79 | pthread_mutex_lock(&next_session_id_lock); | |
80 | ret = ++_next_session_id; | |
81 | pthread_mutex_unlock(&next_session_id_lock); | |
82 | return ret; | |
ffe60014 DG |
83 | } |
84 | ||
d65d2de8 DG |
85 | static void copy_channel_attr_to_ustctl( |
86 | struct ustctl_consumer_channel_attr *attr, | |
87 | struct lttng_ust_channel_attr *uattr) | |
88 | { | |
89 | /* Copy event attributes since the layout is different. */ | |
90 | attr->subbuf_size = uattr->subbuf_size; | |
91 | attr->num_subbuf = uattr->num_subbuf; | |
92 | attr->overwrite = uattr->overwrite; | |
93 | attr->switch_timer_interval = uattr->switch_timer_interval; | |
94 | attr->read_timer_interval = uattr->read_timer_interval; | |
95 | attr->output = uattr->output; | |
491d1539 | 96 | attr->blocking_timeout = uattr->u.s.blocking_timeout; |
d65d2de8 DG |
97 | } |
98 | ||
025faf73 DG |
99 | /* |
100 | * Match function for the hash table lookup. | |
101 | * | |
102 | * It matches an ust app event based on three attributes which are the event | |
103 | * name, the filter bytecode and the loglevel. | |
104 | */ | |
18eace3b DG |
105 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
106 | { | |
107 | struct ust_app_event *event; | |
108 | const struct ust_app_ht_key *key; | |
2106efa0 | 109 | int ev_loglevel_value; |
18eace3b DG |
110 | |
111 | assert(node); | |
112 | assert(_key); | |
113 | ||
114 | event = caa_container_of(node, struct ust_app_event, node.node); | |
115 | key = _key; | |
2106efa0 | 116 | ev_loglevel_value = event->attr.loglevel; |
18eace3b | 117 | |
1af53eb5 | 118 | /* Match the 4 elements of the key: name, filter, loglevel, exclusions */ |
18eace3b DG |
119 | |
120 | /* Event name */ | |
121 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
122 | goto no_match; | |
123 | } | |
124 | ||
125 | /* Event loglevel. */ | |
2106efa0 | 126 | if (ev_loglevel_value != key->loglevel_type) { |
025faf73 | 127 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
2106efa0 PP |
128 | && key->loglevel_type == 0 && |
129 | ev_loglevel_value == -1) { | |
025faf73 DG |
130 | /* |
131 | * Match is accepted. This is because on event creation, the | |
132 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
133 | * -1 are accepted for this loglevel type since 0 is the one set by | |
134 | * the API when receiving an enable event. | |
135 | */ | |
136 | } else { | |
137 | goto no_match; | |
138 | } | |
18eace3b DG |
139 | } |
140 | ||
141 | /* One of the filters is NULL, fail. */ | |
142 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
143 | goto no_match; | |
144 | } | |
145 | ||
025faf73 DG |
146 | if (key->filter && event->filter) { |
147 | /* Both filters exists, check length followed by the bytecode. */ | |
148 | if (event->filter->len != key->filter->len || | |
149 | memcmp(event->filter->data, key->filter->data, | |
150 | event->filter->len) != 0) { | |
151 | goto no_match; | |
152 | } | |
18eace3b DG |
153 | } |
154 | ||
1af53eb5 JI |
155 | /* One of the exclusions is NULL, fail. */ |
156 | if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) { | |
157 | goto no_match; | |
158 | } | |
159 | ||
160 | if (key->exclusion && event->exclusion) { | |
161 | /* Both exclusions exists, check count followed by the names. */ | |
162 | if (event->exclusion->count != key->exclusion->count || | |
163 | memcmp(event->exclusion->names, key->exclusion->names, | |
164 | event->exclusion->count * LTTNG_UST_SYM_NAME_LEN) != 0) { | |
165 | goto no_match; | |
166 | } | |
167 | } | |
168 | ||
169 | ||
025faf73 | 170 | /* Match. */ |
18eace3b DG |
171 | return 1; |
172 | ||
173 | no_match: | |
174 | return 0; | |
18eace3b DG |
175 | } |
176 | ||
025faf73 DG |
177 | /* |
178 | * Unique add of an ust app event in the given ht. This uses the custom | |
179 | * ht_match_ust_app_event match function and the event name as hash. | |
180 | */ | |
d0b96690 | 181 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
182 | struct ust_app_event *event) |
183 | { | |
184 | struct cds_lfht_node *node_ptr; | |
185 | struct ust_app_ht_key key; | |
d0b96690 | 186 | struct lttng_ht *ht; |
18eace3b | 187 | |
d0b96690 DG |
188 | assert(ua_chan); |
189 | assert(ua_chan->events); | |
18eace3b DG |
190 | assert(event); |
191 | ||
d0b96690 | 192 | ht = ua_chan->events; |
18eace3b DG |
193 | key.name = event->attr.name; |
194 | key.filter = event->filter; | |
2106efa0 | 195 | key.loglevel_type = event->attr.loglevel; |
91c89f23 | 196 | key.exclusion = event->exclusion; |
18eace3b DG |
197 | |
198 | node_ptr = cds_lfht_add_unique(ht->ht, | |
199 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
200 | ht_match_ust_app_event, &key, &event->node.node); | |
201 | assert(node_ptr == &event->node.node); | |
202 | } | |
203 | ||
d88aee68 DG |
204 | /* |
205 | * Close the notify socket from the given RCU head object. This MUST be called | |
206 | * through a call_rcu(). | |
207 | */ | |
208 | static void close_notify_sock_rcu(struct rcu_head *head) | |
209 | { | |
210 | int ret; | |
211 | struct ust_app_notify_sock_obj *obj = | |
212 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
213 | ||
214 | /* Must have a valid fd here. */ | |
215 | assert(obj->fd >= 0); | |
216 | ||
217 | ret = close(obj->fd); | |
218 | if (ret) { | |
219 | ERR("close notify sock %d RCU", obj->fd); | |
220 | } | |
221 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
222 | ||
223 | free(obj); | |
224 | } | |
225 | ||
7972aab2 DG |
226 | /* |
227 | * Return the session registry according to the buffer type of the given | |
228 | * session. | |
229 | * | |
230 | * A registry per UID object MUST exists before calling this function or else | |
231 | * it assert() if not found. RCU read side lock must be acquired. | |
232 | */ | |
233 | static struct ust_registry_session *get_session_registry( | |
234 | struct ust_app_session *ua_sess) | |
235 | { | |
236 | struct ust_registry_session *registry = NULL; | |
237 | ||
238 | assert(ua_sess); | |
239 | ||
240 | switch (ua_sess->buffer_type) { | |
241 | case LTTNG_BUFFER_PER_PID: | |
242 | { | |
243 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
244 | if (!reg_pid) { | |
245 | goto error; | |
246 | } | |
247 | registry = reg_pid->registry->reg.ust; | |
248 | break; | |
249 | } | |
250 | case LTTNG_BUFFER_PER_UID: | |
251 | { | |
252 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
253 | ua_sess->tracing_id, ua_sess->bits_per_long, ua_sess->uid); | |
254 | if (!reg_uid) { | |
255 | goto error; | |
256 | } | |
257 | registry = reg_uid->registry->reg.ust; | |
258 | break; | |
259 | } | |
260 | default: | |
261 | assert(0); | |
262 | }; | |
263 | ||
264 | error: | |
265 | return registry; | |
266 | } | |
267 | ||
55cc08a6 DG |
268 | /* |
269 | * Delete ust context safely. RCU read lock must be held before calling | |
270 | * this function. | |
271 | */ | |
272 | static | |
fb45065e MD |
273 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx, |
274 | struct ust_app *app) | |
55cc08a6 | 275 | { |
ffe60014 DG |
276 | int ret; |
277 | ||
278 | assert(ua_ctx); | |
279 | ||
55cc08a6 | 280 | if (ua_ctx->obj) { |
fb45065e | 281 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 282 | ret = ustctl_release_object(sock, ua_ctx->obj); |
fb45065e | 283 | pthread_mutex_unlock(&app->sock_lock); |
d0b96690 DG |
284 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
285 | ERR("UST app sock %d release ctx obj handle %d failed with ret %d", | |
286 | sock, ua_ctx->obj->handle, ret); | |
ffe60014 | 287 | } |
55cc08a6 DG |
288 | free(ua_ctx->obj); |
289 | } | |
290 | free(ua_ctx); | |
291 | } | |
292 | ||
d80a6244 DG |
293 | /* |
294 | * Delete ust app event safely. RCU read lock must be held before calling | |
295 | * this function. | |
296 | */ | |
8b366481 | 297 | static |
fb45065e MD |
298 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event, |
299 | struct ust_app *app) | |
d80a6244 | 300 | { |
ffe60014 DG |
301 | int ret; |
302 | ||
303 | assert(ua_event); | |
304 | ||
53a80697 | 305 | free(ua_event->filter); |
951f0b71 JI |
306 | if (ua_event->exclusion != NULL) |
307 | free(ua_event->exclusion); | |
edb67388 | 308 | if (ua_event->obj != NULL) { |
fb45065e | 309 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 310 | ret = ustctl_release_object(sock, ua_event->obj); |
fb45065e | 311 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
312 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
313 | ERR("UST app sock %d release event obj failed with ret %d", | |
314 | sock, ret); | |
315 | } | |
edb67388 DG |
316 | free(ua_event->obj); |
317 | } | |
d80a6244 DG |
318 | free(ua_event); |
319 | } | |
320 | ||
321 | /* | |
7972aab2 DG |
322 | * Release ust data object of the given stream. |
323 | * | |
324 | * Return 0 on success or else a negative value. | |
d80a6244 | 325 | */ |
fb45065e MD |
326 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream, |
327 | struct ust_app *app) | |
d80a6244 | 328 | { |
7972aab2 | 329 | int ret = 0; |
ffe60014 DG |
330 | |
331 | assert(stream); | |
332 | ||
8b366481 | 333 | if (stream->obj) { |
fb45065e | 334 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 335 | ret = ustctl_release_object(sock, stream->obj); |
fb45065e | 336 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
337 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
338 | ERR("UST app sock %d release stream obj failed with ret %d", | |
339 | sock, ret); | |
340 | } | |
4063050c | 341 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
342 | free(stream->obj); |
343 | } | |
7972aab2 DG |
344 | |
345 | return ret; | |
346 | } | |
347 | ||
348 | /* | |
349 | * Delete ust app stream safely. RCU read lock must be held before calling | |
350 | * this function. | |
351 | */ | |
352 | static | |
fb45065e MD |
353 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream, |
354 | struct ust_app *app) | |
7972aab2 DG |
355 | { |
356 | assert(stream); | |
357 | ||
fb45065e | 358 | (void) release_ust_app_stream(sock, stream, app); |
84cd17c6 | 359 | free(stream); |
d80a6244 DG |
360 | } |
361 | ||
36b588ed MD |
362 | /* |
363 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
364 | * section and outside of call_rcu thread, so we postpone its execution |
365 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
366 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
367 | */ |
368 | static | |
369 | void delete_ust_app_channel_rcu(struct rcu_head *head) | |
370 | { | |
371 | struct ust_app_channel *ua_chan = | |
372 | caa_container_of(head, struct ust_app_channel, rcu_head); | |
373 | ||
0b2dc8df MD |
374 | ht_cleanup_push(ua_chan->ctx); |
375 | ht_cleanup_push(ua_chan->events); | |
36b588ed MD |
376 | free(ua_chan); |
377 | } | |
378 | ||
fb83fe64 JD |
379 | /* |
380 | * Extract the lost packet or discarded events counter when the channel is | |
381 | * being deleted and store the value in the parent channel so we can | |
382 | * access it from lttng list and at stop/destroy. | |
82cac6d2 JG |
383 | * |
384 | * The session list lock must be held by the caller. | |
fb83fe64 JD |
385 | */ |
386 | static | |
387 | void save_per_pid_lost_discarded_counters(struct ust_app_channel *ua_chan) | |
388 | { | |
389 | uint64_t discarded = 0, lost = 0; | |
390 | struct ltt_session *session; | |
391 | struct ltt_ust_channel *uchan; | |
392 | ||
393 | if (ua_chan->attr.type != LTTNG_UST_CHAN_PER_CPU) { | |
394 | return; | |
395 | } | |
396 | ||
397 | rcu_read_lock(); | |
398 | session = session_find_by_id(ua_chan->session->tracing_id); | |
d68ec974 JG |
399 | if (!session || !session->ust_session) { |
400 | /* | |
401 | * Not finding the session is not an error because there are | |
402 | * multiple ways the channels can be torn down. | |
403 | * | |
404 | * 1) The session daemon can initiate the destruction of the | |
405 | * ust app session after receiving a destroy command or | |
406 | * during its shutdown/teardown. | |
407 | * 2) The application, since we are in per-pid tracing, is | |
408 | * unregistering and tearing down its ust app session. | |
409 | * | |
410 | * Both paths are protected by the session list lock which | |
411 | * ensures that the accounting of lost packets and discarded | |
412 | * events is done exactly once. The session is then unpublished | |
413 | * from the session list, resulting in this condition. | |
414 | */ | |
fb83fe64 JD |
415 | goto end; |
416 | } | |
417 | ||
418 | if (ua_chan->attr.overwrite) { | |
419 | consumer_get_lost_packets(ua_chan->session->tracing_id, | |
420 | ua_chan->key, session->ust_session->consumer, | |
421 | &lost); | |
422 | } else { | |
423 | consumer_get_discarded_events(ua_chan->session->tracing_id, | |
424 | ua_chan->key, session->ust_session->consumer, | |
425 | &discarded); | |
426 | } | |
427 | uchan = trace_ust_find_channel_by_name( | |
428 | session->ust_session->domain_global.channels, | |
429 | ua_chan->name); | |
430 | if (!uchan) { | |
431 | ERR("Missing UST channel to store discarded counters"); | |
432 | goto end; | |
433 | } | |
434 | ||
435 | uchan->per_pid_closed_app_discarded += discarded; | |
436 | uchan->per_pid_closed_app_lost += lost; | |
437 | ||
438 | end: | |
439 | rcu_read_unlock(); | |
440 | } | |
441 | ||
d80a6244 DG |
442 | /* |
443 | * Delete ust app channel safely. RCU read lock must be held before calling | |
444 | * this function. | |
82cac6d2 JG |
445 | * |
446 | * The session list lock must be held by the caller. | |
d80a6244 | 447 | */ |
8b366481 | 448 | static |
d0b96690 DG |
449 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
450 | struct ust_app *app) | |
d80a6244 DG |
451 | { |
452 | int ret; | |
bec39940 | 453 | struct lttng_ht_iter iter; |
d80a6244 | 454 | struct ust_app_event *ua_event; |
55cc08a6 | 455 | struct ust_app_ctx *ua_ctx; |
030a66fa | 456 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 457 | struct ust_registry_session *registry; |
d80a6244 | 458 | |
ffe60014 DG |
459 | assert(ua_chan); |
460 | ||
461 | DBG3("UST app deleting channel %s", ua_chan->name); | |
462 | ||
55cc08a6 | 463 | /* Wipe stream */ |
d80a6244 | 464 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 465 | cds_list_del(&stream->list); |
fb45065e | 466 | delete_ust_app_stream(sock, stream, app); |
d80a6244 DG |
467 | } |
468 | ||
55cc08a6 | 469 | /* Wipe context */ |
bec39940 | 470 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
31746f93 | 471 | cds_list_del(&ua_ctx->list); |
bec39940 | 472 | ret = lttng_ht_del(ua_chan->ctx, &iter); |
55cc08a6 | 473 | assert(!ret); |
fb45065e | 474 | delete_ust_app_ctx(sock, ua_ctx, app); |
55cc08a6 | 475 | } |
d80a6244 | 476 | |
55cc08a6 | 477 | /* Wipe events */ |
bec39940 DG |
478 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
479 | node.node) { | |
480 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 481 | assert(!ret); |
fb45065e | 482 | delete_ust_app_event(sock, ua_event, app); |
d80a6244 | 483 | } |
edb67388 | 484 | |
c8335706 MD |
485 | if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) { |
486 | /* Wipe and free registry from session registry. */ | |
487 | registry = get_session_registry(ua_chan->session); | |
488 | if (registry) { | |
e9404c27 JG |
489 | ust_registry_channel_del_free(registry, ua_chan->key, |
490 | true); | |
c8335706 | 491 | } |
fb83fe64 | 492 | save_per_pid_lost_discarded_counters(ua_chan); |
7972aab2 | 493 | } |
d0b96690 | 494 | |
edb67388 | 495 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
496 | /* Remove channel from application UST object descriptor. */ |
497 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
c6e62271 DG |
498 | ret = lttng_ht_del(app->ust_objd, &iter); |
499 | assert(!ret); | |
fb45065e | 500 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 501 | ret = ustctl_release_object(sock, ua_chan->obj); |
fb45065e | 502 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
503 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
504 | ERR("UST app sock %d release channel obj failed with ret %d", | |
505 | sock, ret); | |
506 | } | |
7972aab2 | 507 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
508 | free(ua_chan->obj); |
509 | } | |
36b588ed | 510 | call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); |
d80a6244 DG |
511 | } |
512 | ||
fb45065e MD |
513 | int ust_app_register_done(struct ust_app *app) |
514 | { | |
515 | int ret; | |
516 | ||
517 | pthread_mutex_lock(&app->sock_lock); | |
518 | ret = ustctl_register_done(app->sock); | |
519 | pthread_mutex_unlock(&app->sock_lock); | |
520 | return ret; | |
521 | } | |
522 | ||
523 | int ust_app_release_object(struct ust_app *app, struct lttng_ust_object_data *data) | |
524 | { | |
525 | int ret, sock; | |
526 | ||
527 | if (app) { | |
528 | pthread_mutex_lock(&app->sock_lock); | |
529 | sock = app->sock; | |
530 | } else { | |
531 | sock = -1; | |
532 | } | |
533 | ret = ustctl_release_object(sock, data); | |
534 | if (app) { | |
535 | pthread_mutex_unlock(&app->sock_lock); | |
536 | } | |
537 | return ret; | |
538 | } | |
539 | ||
331744e3 | 540 | /* |
1b532a60 DG |
541 | * Push metadata to consumer socket. |
542 | * | |
dc2bbdae MD |
543 | * RCU read-side lock must be held to guarantee existance of socket. |
544 | * Must be called with the ust app session lock held. | |
545 | * Must be called with the registry lock held. | |
331744e3 JD |
546 | * |
547 | * On success, return the len of metadata pushed or else a negative value. | |
2c57e06d MD |
548 | * Returning a -EPIPE return value means we could not send the metadata, |
549 | * but it can be caused by recoverable errors (e.g. the application has | |
550 | * terminated concurrently). | |
331744e3 JD |
551 | */ |
552 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
553 | struct consumer_socket *socket, int send_zero_data) | |
554 | { | |
555 | int ret; | |
556 | char *metadata_str = NULL; | |
c585821b | 557 | size_t len, offset, new_metadata_len_sent; |
331744e3 | 558 | ssize_t ret_val; |
93ec662e | 559 | uint64_t metadata_key, metadata_version; |
331744e3 JD |
560 | |
561 | assert(registry); | |
562 | assert(socket); | |
1b532a60 | 563 | |
c585821b MD |
564 | metadata_key = registry->metadata_key; |
565 | ||
ce34fcd0 | 566 | /* |
dc2bbdae MD |
567 | * Means that no metadata was assigned to the session. This can |
568 | * happens if no start has been done previously. | |
ce34fcd0 | 569 | */ |
c585821b | 570 | if (!metadata_key) { |
ce34fcd0 MD |
571 | return 0; |
572 | } | |
573 | ||
331744e3 JD |
574 | offset = registry->metadata_len_sent; |
575 | len = registry->metadata_len - registry->metadata_len_sent; | |
c585821b | 576 | new_metadata_len_sent = registry->metadata_len; |
93ec662e | 577 | metadata_version = registry->metadata_version; |
331744e3 JD |
578 | if (len == 0) { |
579 | DBG3("No metadata to push for metadata key %" PRIu64, | |
580 | registry->metadata_key); | |
581 | ret_val = len; | |
582 | if (send_zero_data) { | |
583 | DBG("No metadata to push"); | |
584 | goto push_data; | |
585 | } | |
586 | goto end; | |
587 | } | |
588 | ||
589 | /* Allocate only what we have to send. */ | |
590 | metadata_str = zmalloc(len); | |
591 | if (!metadata_str) { | |
592 | PERROR("zmalloc ust app metadata string"); | |
593 | ret_val = -ENOMEM; | |
594 | goto error; | |
595 | } | |
c585821b | 596 | /* Copy what we haven't sent out. */ |
331744e3 | 597 | memcpy(metadata_str, registry->metadata + offset, len); |
331744e3 JD |
598 | |
599 | push_data: | |
c585821b MD |
600 | pthread_mutex_unlock(®istry->lock); |
601 | /* | |
602 | * We need to unlock the registry while we push metadata to | |
603 | * break a circular dependency between the consumerd metadata | |
604 | * lock and the sessiond registry lock. Indeed, pushing metadata | |
605 | * to the consumerd awaits that it gets pushed all the way to | |
606 | * relayd, but doing so requires grabbing the metadata lock. If | |
607 | * a concurrent metadata request is being performed by | |
608 | * consumerd, this can try to grab the registry lock on the | |
609 | * sessiond while holding the metadata lock on the consumer | |
610 | * daemon. Those push and pull schemes are performed on two | |
611 | * different bidirectionnal communication sockets. | |
612 | */ | |
613 | ret = consumer_push_metadata(socket, metadata_key, | |
93ec662e | 614 | metadata_str, len, offset, metadata_version); |
c585821b | 615 | pthread_mutex_lock(®istry->lock); |
331744e3 | 616 | if (ret < 0) { |
000baf6a | 617 | /* |
dc2bbdae MD |
618 | * There is an acceptable race here between the registry |
619 | * metadata key assignment and the creation on the | |
620 | * consumer. The session daemon can concurrently push | |
621 | * metadata for this registry while being created on the | |
622 | * consumer since the metadata key of the registry is | |
623 | * assigned *before* it is setup to avoid the consumer | |
624 | * to ask for metadata that could possibly be not found | |
625 | * in the session daemon. | |
000baf6a | 626 | * |
dc2bbdae MD |
627 | * The metadata will get pushed either by the session |
628 | * being stopped or the consumer requesting metadata if | |
629 | * that race is triggered. | |
000baf6a DG |
630 | */ |
631 | if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) { | |
632 | ret = 0; | |
c585821b MD |
633 | } else { |
634 | ERR("Error pushing metadata to consumer"); | |
000baf6a | 635 | } |
331744e3 JD |
636 | ret_val = ret; |
637 | goto error_push; | |
c585821b MD |
638 | } else { |
639 | /* | |
640 | * Metadata may have been concurrently pushed, since | |
641 | * we're not holding the registry lock while pushing to | |
642 | * consumer. This is handled by the fact that we send | |
643 | * the metadata content, size, and the offset at which | |
644 | * that metadata belongs. This may arrive out of order | |
645 | * on the consumer side, and the consumer is able to | |
646 | * deal with overlapping fragments. The consumer | |
647 | * supports overlapping fragments, which must be | |
648 | * contiguous starting from offset 0. We keep the | |
649 | * largest metadata_len_sent value of the concurrent | |
650 | * send. | |
651 | */ | |
652 | registry->metadata_len_sent = | |
653 | max_t(size_t, registry->metadata_len_sent, | |
654 | new_metadata_len_sent); | |
331744e3 | 655 | } |
331744e3 JD |
656 | free(metadata_str); |
657 | return len; | |
658 | ||
659 | end: | |
660 | error: | |
ce34fcd0 MD |
661 | if (ret_val) { |
662 | /* | |
dc2bbdae MD |
663 | * On error, flag the registry that the metadata is |
664 | * closed. We were unable to push anything and this | |
665 | * means that either the consumer is not responding or | |
666 | * the metadata cache has been destroyed on the | |
667 | * consumer. | |
ce34fcd0 MD |
668 | */ |
669 | registry->metadata_closed = 1; | |
670 | } | |
331744e3 JD |
671 | error_push: |
672 | free(metadata_str); | |
673 | return ret_val; | |
674 | } | |
675 | ||
d88aee68 | 676 | /* |
ce34fcd0 | 677 | * For a given application and session, push metadata to consumer. |
331744e3 JD |
678 | * Either sock or consumer is required : if sock is NULL, the default |
679 | * socket to send the metadata is retrieved from consumer, if sock | |
680 | * is not NULL we use it to send the metadata. | |
ce34fcd0 | 681 | * RCU read-side lock must be held while calling this function, |
dc2bbdae MD |
682 | * therefore ensuring existance of registry. It also ensures existance |
683 | * of socket throughout this function. | |
d88aee68 DG |
684 | * |
685 | * Return 0 on success else a negative error. | |
2c57e06d MD |
686 | * Returning a -EPIPE return value means we could not send the metadata, |
687 | * but it can be caused by recoverable errors (e.g. the application has | |
688 | * terminated concurrently). | |
d88aee68 | 689 | */ |
7972aab2 DG |
690 | static int push_metadata(struct ust_registry_session *registry, |
691 | struct consumer_output *consumer) | |
d88aee68 | 692 | { |
331744e3 JD |
693 | int ret_val; |
694 | ssize_t ret; | |
d88aee68 DG |
695 | struct consumer_socket *socket; |
696 | ||
7972aab2 DG |
697 | assert(registry); |
698 | assert(consumer); | |
699 | ||
ce34fcd0 | 700 | pthread_mutex_lock(®istry->lock); |
ce34fcd0 | 701 | if (registry->metadata_closed) { |
dc2bbdae MD |
702 | ret_val = -EPIPE; |
703 | goto error; | |
d88aee68 DG |
704 | } |
705 | ||
d88aee68 | 706 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
707 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
708 | consumer); | |
d88aee68 | 709 | if (!socket) { |
331744e3 | 710 | ret_val = -1; |
ce34fcd0 | 711 | goto error; |
d88aee68 DG |
712 | } |
713 | ||
331744e3 | 714 | ret = ust_app_push_metadata(registry, socket, 0); |
d88aee68 | 715 | if (ret < 0) { |
331744e3 | 716 | ret_val = ret; |
ce34fcd0 | 717 | goto error; |
d88aee68 | 718 | } |
dc2bbdae | 719 | pthread_mutex_unlock(®istry->lock); |
d88aee68 DG |
720 | return 0; |
721 | ||
ce34fcd0 | 722 | error: |
dc2bbdae | 723 | pthread_mutex_unlock(®istry->lock); |
331744e3 | 724 | return ret_val; |
d88aee68 DG |
725 | } |
726 | ||
727 | /* | |
728 | * Send to the consumer a close metadata command for the given session. Once | |
729 | * done, the metadata channel is deleted and the session metadata pointer is | |
dc2bbdae | 730 | * nullified. The session lock MUST be held unless the application is |
d88aee68 DG |
731 | * in the destroy path. |
732 | * | |
733 | * Return 0 on success else a negative value. | |
734 | */ | |
7972aab2 DG |
735 | static int close_metadata(struct ust_registry_session *registry, |
736 | struct consumer_output *consumer) | |
d88aee68 DG |
737 | { |
738 | int ret; | |
739 | struct consumer_socket *socket; | |
740 | ||
7972aab2 DG |
741 | assert(registry); |
742 | assert(consumer); | |
d88aee68 | 743 | |
7972aab2 DG |
744 | rcu_read_lock(); |
745 | ||
ce34fcd0 MD |
746 | pthread_mutex_lock(®istry->lock); |
747 | ||
7972aab2 | 748 | if (!registry->metadata_key || registry->metadata_closed) { |
d88aee68 | 749 | ret = 0; |
1b532a60 | 750 | goto end; |
d88aee68 DG |
751 | } |
752 | ||
d88aee68 | 753 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
754 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
755 | consumer); | |
d88aee68 DG |
756 | if (!socket) { |
757 | ret = -1; | |
7972aab2 | 758 | goto error; |
d88aee68 DG |
759 | } |
760 | ||
7972aab2 | 761 | ret = consumer_close_metadata(socket, registry->metadata_key); |
d88aee68 | 762 | if (ret < 0) { |
7972aab2 | 763 | goto error; |
d88aee68 DG |
764 | } |
765 | ||
d88aee68 | 766 | error: |
1b532a60 DG |
767 | /* |
768 | * Metadata closed. Even on error this means that the consumer is not | |
769 | * responding or not found so either way a second close should NOT be emit | |
770 | * for this registry. | |
771 | */ | |
772 | registry->metadata_closed = 1; | |
773 | end: | |
ce34fcd0 | 774 | pthread_mutex_unlock(®istry->lock); |
7972aab2 | 775 | rcu_read_unlock(); |
d88aee68 DG |
776 | return ret; |
777 | } | |
778 | ||
36b588ed MD |
779 | /* |
780 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
781 | * section and outside of call_rcu thread, so we postpone its execution |
782 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
783 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
784 | */ |
785 | static | |
786 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
787 | { | |
788 | struct ust_app_session *ua_sess = | |
789 | caa_container_of(head, struct ust_app_session, rcu_head); | |
790 | ||
0b2dc8df | 791 | ht_cleanup_push(ua_sess->channels); |
36b588ed MD |
792 | free(ua_sess); |
793 | } | |
794 | ||
d80a6244 DG |
795 | /* |
796 | * Delete ust app session safely. RCU read lock must be held before calling | |
797 | * this function. | |
82cac6d2 JG |
798 | * |
799 | * The session list lock must be held by the caller. | |
d80a6244 | 800 | */ |
8b366481 | 801 | static |
d0b96690 DG |
802 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
803 | struct ust_app *app) | |
d80a6244 DG |
804 | { |
805 | int ret; | |
bec39940 | 806 | struct lttng_ht_iter iter; |
d80a6244 | 807 | struct ust_app_channel *ua_chan; |
7972aab2 | 808 | struct ust_registry_session *registry; |
d80a6244 | 809 | |
d88aee68 DG |
810 | assert(ua_sess); |
811 | ||
1b532a60 DG |
812 | pthread_mutex_lock(&ua_sess->lock); |
813 | ||
b161602a MD |
814 | assert(!ua_sess->deleted); |
815 | ua_sess->deleted = true; | |
816 | ||
7972aab2 | 817 | registry = get_session_registry(ua_sess); |
fad1ed2f | 818 | /* Registry can be null on error path during initialization. */ |
ce34fcd0 | 819 | if (registry) { |
d88aee68 | 820 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 821 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 822 | |
7972aab2 DG |
823 | /* |
824 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
825 | * metadata only on destroy trace session in this case. Also, the |
826 | * previous push metadata could have flag the metadata registry to | |
827 | * close so don't send a close command if closed. | |
7972aab2 | 828 | */ |
ce34fcd0 | 829 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
830 | /* And ask to close it for this session registry. */ |
831 | (void) close_metadata(registry, ua_sess->consumer); | |
832 | } | |
d80a6244 DG |
833 | } |
834 | ||
bec39940 DG |
835 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
836 | node.node) { | |
837 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 838 | assert(!ret); |
d0b96690 | 839 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 840 | } |
d80a6244 | 841 | |
7972aab2 DG |
842 | /* In case of per PID, the registry is kept in the session. */ |
843 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
844 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
845 | if (reg_pid) { | |
fad1ed2f JR |
846 | /* |
847 | * Registry can be null on error path during | |
848 | * initialization. | |
849 | */ | |
7972aab2 DG |
850 | buffer_reg_pid_remove(reg_pid); |
851 | buffer_reg_pid_destroy(reg_pid); | |
852 | } | |
853 | } | |
d0b96690 | 854 | |
aee6bafd | 855 | if (ua_sess->handle != -1) { |
fb45065e | 856 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 857 | ret = ustctl_release_handle(sock, ua_sess->handle); |
fb45065e | 858 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
859 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
860 | ERR("UST app sock %d release session handle failed with ret %d", | |
861 | sock, ret); | |
862 | } | |
10b56aef MD |
863 | /* Remove session from application UST object descriptor. */ |
864 | iter.iter.node = &ua_sess->ust_objd_node.node; | |
865 | ret = lttng_ht_del(app->ust_sessions_objd, &iter); | |
866 | assert(!ret); | |
aee6bafd | 867 | } |
10b56aef | 868 | |
1b532a60 DG |
869 | pthread_mutex_unlock(&ua_sess->lock); |
870 | ||
6addfa37 MD |
871 | consumer_output_put(ua_sess->consumer); |
872 | ||
36b588ed | 873 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 874 | } |
91d76f53 DG |
875 | |
876 | /* | |
284d8f55 DG |
877 | * Delete a traceable application structure from the global list. Never call |
878 | * this function outside of a call_rcu call. | |
36b588ed MD |
879 | * |
880 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 881 | */ |
8b366481 DG |
882 | static |
883 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 884 | { |
8b366481 | 885 | int ret, sock; |
d42f20df | 886 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 887 | |
82cac6d2 JG |
888 | /* |
889 | * The session list lock must be held during this function to guarantee | |
890 | * the existence of ua_sess. | |
891 | */ | |
892 | session_lock_list(); | |
d80a6244 | 893 | /* Delete ust app sessions info */ |
852d0037 DG |
894 | sock = app->sock; |
895 | app->sock = -1; | |
d80a6244 | 896 | |
8b366481 | 897 | /* Wipe sessions */ |
d42f20df DG |
898 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
899 | teardown_node) { | |
900 | /* Free every object in the session and the session. */ | |
36b588ed | 901 | rcu_read_lock(); |
d0b96690 | 902 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 903 | rcu_read_unlock(); |
d80a6244 | 904 | } |
36b588ed | 905 | |
0b2dc8df | 906 | ht_cleanup_push(app->sessions); |
10b56aef | 907 | ht_cleanup_push(app->ust_sessions_objd); |
0b2dc8df | 908 | ht_cleanup_push(app->ust_objd); |
d80a6244 | 909 | |
6414a713 | 910 | /* |
852d0037 DG |
911 | * Wait until we have deleted the application from the sock hash table |
912 | * before closing this socket, otherwise an application could re-use the | |
913 | * socket ID and race with the teardown, using the same hash table entry. | |
914 | * | |
915 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
916 | * all RCU readers that could run concurrently with unregister app, | |
917 | * therefore we _need_ to only close that socket after a grace period. So | |
918 | * it should stay in this RCU callback. | |
919 | * | |
920 | * This close() is a very important step of the synchronization model so | |
921 | * every modification to this function must be carefully reviewed. | |
6414a713 | 922 | */ |
799e2c4f MD |
923 | ret = close(sock); |
924 | if (ret) { | |
925 | PERROR("close"); | |
926 | } | |
4063050c | 927 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 928 | |
852d0037 | 929 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 930 | free(app); |
82cac6d2 | 931 | session_unlock_list(); |
099e26bd DG |
932 | } |
933 | ||
934 | /* | |
f6a9efaa | 935 | * URCU intermediate call to delete an UST app. |
099e26bd | 936 | */ |
8b366481 DG |
937 | static |
938 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 939 | { |
bec39940 DG |
940 | struct lttng_ht_node_ulong *node = |
941 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 942 | struct ust_app *app = |
852d0037 | 943 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 944 | |
852d0037 | 945 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 946 | delete_ust_app(app); |
099e26bd DG |
947 | } |
948 | ||
ffe60014 DG |
949 | /* |
950 | * Delete the session from the application ht and delete the data structure by | |
951 | * freeing every object inside and releasing them. | |
82cac6d2 JG |
952 | * |
953 | * The session list lock must be held by the caller. | |
ffe60014 | 954 | */ |
d0b96690 | 955 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
956 | struct ust_app_session *ua_sess) |
957 | { | |
958 | int ret; | |
959 | struct lttng_ht_iter iter; | |
960 | ||
961 | assert(app); | |
962 | assert(ua_sess); | |
963 | ||
964 | iter.iter.node = &ua_sess->node.node; | |
965 | ret = lttng_ht_del(app->sessions, &iter); | |
966 | if (ret) { | |
967 | /* Already scheduled for teardown. */ | |
968 | goto end; | |
969 | } | |
970 | ||
971 | /* Once deleted, free the data structure. */ | |
d0b96690 | 972 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
973 | |
974 | end: | |
975 | return; | |
976 | } | |
977 | ||
8b366481 DG |
978 | /* |
979 | * Alloc new UST app session. | |
980 | */ | |
981 | static | |
40bbd087 | 982 | struct ust_app_session *alloc_ust_app_session(void) |
8b366481 DG |
983 | { |
984 | struct ust_app_session *ua_sess; | |
985 | ||
986 | /* Init most of the default value by allocating and zeroing */ | |
987 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
988 | if (ua_sess == NULL) { | |
989 | PERROR("malloc"); | |
ffe60014 | 990 | goto error_free; |
8b366481 DG |
991 | } |
992 | ||
993 | ua_sess->handle = -1; | |
bec39940 | 994 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
ad7a9107 | 995 | ua_sess->metadata_attr.type = LTTNG_UST_CHAN_METADATA; |
84ad93e8 | 996 | pthread_mutex_init(&ua_sess->lock, NULL); |
ad7a9107 | 997 | |
8b366481 DG |
998 | return ua_sess; |
999 | ||
ffe60014 | 1000 | error_free: |
8b366481 DG |
1001 | return NULL; |
1002 | } | |
1003 | ||
1004 | /* | |
1005 | * Alloc new UST app channel. | |
1006 | */ | |
1007 | static | |
1008 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 1009 | struct ust_app_session *ua_sess, |
ffe60014 | 1010 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
1011 | { |
1012 | struct ust_app_channel *ua_chan; | |
1013 | ||
1014 | /* Init most of the default value by allocating and zeroing */ | |
1015 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
1016 | if (ua_chan == NULL) { | |
1017 | PERROR("malloc"); | |
1018 | goto error; | |
1019 | } | |
1020 | ||
1021 | /* Setup channel name */ | |
1022 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
1023 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
1024 | ||
1025 | ua_chan->enabled = 1; | |
1026 | ua_chan->handle = -1; | |
45893984 | 1027 | ua_chan->session = ua_sess; |
ffe60014 | 1028 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
1029 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
1030 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
1031 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
1032 | |
1033 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
31746f93 | 1034 | CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); |
8b366481 DG |
1035 | |
1036 | /* Copy attributes */ | |
1037 | if (attr) { | |
ffe60014 | 1038 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
1039 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
1040 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
1041 | ua_chan->attr.overwrite = attr->overwrite; | |
1042 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
1043 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
1044 | ua_chan->attr.output = attr->output; | |
491d1539 | 1045 | ua_chan->attr.blocking_timeout = attr->u.s.blocking_timeout; |
8b366481 | 1046 | } |
ffe60014 DG |
1047 | /* By default, the channel is a per cpu channel. */ |
1048 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
1049 | |
1050 | DBG3("UST app channel %s allocated", ua_chan->name); | |
1051 | ||
1052 | return ua_chan; | |
1053 | ||
1054 | error: | |
1055 | return NULL; | |
1056 | } | |
1057 | ||
37f1c236 DG |
1058 | /* |
1059 | * Allocate and initialize a UST app stream. | |
1060 | * | |
1061 | * Return newly allocated stream pointer or NULL on error. | |
1062 | */ | |
ffe60014 | 1063 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
1064 | { |
1065 | struct ust_app_stream *stream = NULL; | |
1066 | ||
1067 | stream = zmalloc(sizeof(*stream)); | |
1068 | if (stream == NULL) { | |
1069 | PERROR("zmalloc ust app stream"); | |
1070 | goto error; | |
1071 | } | |
1072 | ||
1073 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
1074 | stream->handle = -1; | |
1075 | ||
1076 | error: | |
1077 | return stream; | |
1078 | } | |
1079 | ||
8b366481 DG |
1080 | /* |
1081 | * Alloc new UST app event. | |
1082 | */ | |
1083 | static | |
1084 | struct ust_app_event *alloc_ust_app_event(char *name, | |
1085 | struct lttng_ust_event *attr) | |
1086 | { | |
1087 | struct ust_app_event *ua_event; | |
1088 | ||
1089 | /* Init most of the default value by allocating and zeroing */ | |
1090 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
1091 | if (ua_event == NULL) { | |
1092 | PERROR("malloc"); | |
1093 | goto error; | |
1094 | } | |
1095 | ||
1096 | ua_event->enabled = 1; | |
1097 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
1098 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 1099 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
1100 | |
1101 | /* Copy attributes */ | |
1102 | if (attr) { | |
1103 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
1104 | } | |
1105 | ||
1106 | DBG3("UST app event %s allocated", ua_event->name); | |
1107 | ||
1108 | return ua_event; | |
1109 | ||
1110 | error: | |
1111 | return NULL; | |
1112 | } | |
1113 | ||
1114 | /* | |
1115 | * Alloc new UST app context. | |
1116 | */ | |
1117 | static | |
bdf64013 | 1118 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context_attr *uctx) |
8b366481 DG |
1119 | { |
1120 | struct ust_app_ctx *ua_ctx; | |
1121 | ||
1122 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
1123 | if (ua_ctx == NULL) { | |
1124 | goto error; | |
1125 | } | |
1126 | ||
31746f93 DG |
1127 | CDS_INIT_LIST_HEAD(&ua_ctx->list); |
1128 | ||
8b366481 DG |
1129 | if (uctx) { |
1130 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
bdf64013 JG |
1131 | if (uctx->ctx == LTTNG_UST_CONTEXT_APP_CONTEXT) { |
1132 | char *provider_name = NULL, *ctx_name = NULL; | |
1133 | ||
1134 | provider_name = strdup(uctx->u.app_ctx.provider_name); | |
1135 | ctx_name = strdup(uctx->u.app_ctx.ctx_name); | |
1136 | if (!provider_name || !ctx_name) { | |
1137 | free(provider_name); | |
1138 | free(ctx_name); | |
1139 | goto error; | |
1140 | } | |
1141 | ||
1142 | ua_ctx->ctx.u.app_ctx.provider_name = provider_name; | |
1143 | ua_ctx->ctx.u.app_ctx.ctx_name = ctx_name; | |
1144 | } | |
8b366481 DG |
1145 | } |
1146 | ||
1147 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
8b366481 | 1148 | return ua_ctx; |
bdf64013 JG |
1149 | error: |
1150 | free(ua_ctx); | |
1151 | return NULL; | |
8b366481 DG |
1152 | } |
1153 | ||
025faf73 DG |
1154 | /* |
1155 | * Allocate a filter and copy the given original filter. | |
1156 | * | |
1157 | * Return allocated filter or NULL on error. | |
1158 | */ | |
51755dc8 JG |
1159 | static struct lttng_filter_bytecode *copy_filter_bytecode( |
1160 | struct lttng_filter_bytecode *orig_f) | |
025faf73 | 1161 | { |
51755dc8 | 1162 | struct lttng_filter_bytecode *filter = NULL; |
025faf73 DG |
1163 | |
1164 | /* Copy filter bytecode */ | |
1165 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
1166 | if (!filter) { | |
51755dc8 | 1167 | PERROR("zmalloc alloc filter bytecode"); |
025faf73 DG |
1168 | goto error; |
1169 | } | |
1170 | ||
1171 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
1172 | ||
1173 | error: | |
1174 | return filter; | |
1175 | } | |
1176 | ||
51755dc8 JG |
1177 | /* |
1178 | * Create a liblttng-ust filter bytecode from given bytecode. | |
1179 | * | |
1180 | * Return allocated filter or NULL on error. | |
1181 | */ | |
1182 | static struct lttng_ust_filter_bytecode *create_ust_bytecode_from_bytecode( | |
1183 | struct lttng_filter_bytecode *orig_f) | |
1184 | { | |
1185 | struct lttng_ust_filter_bytecode *filter = NULL; | |
1186 | ||
1187 | /* Copy filter bytecode */ | |
1188 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
1189 | if (!filter) { | |
1190 | PERROR("zmalloc alloc ust filter bytecode"); | |
1191 | goto error; | |
1192 | } | |
1193 | ||
1194 | assert(sizeof(struct lttng_filter_bytecode) == | |
1195 | sizeof(struct lttng_ust_filter_bytecode)); | |
1196 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
1197 | error: | |
1198 | return filter; | |
1199 | } | |
1200 | ||
099e26bd | 1201 | /* |
421cb601 DG |
1202 | * Find an ust_app using the sock and return it. RCU read side lock must be |
1203 | * held before calling this helper function. | |
099e26bd | 1204 | */ |
f20baf8e | 1205 | struct ust_app *ust_app_find_by_sock(int sock) |
099e26bd | 1206 | { |
bec39940 | 1207 | struct lttng_ht_node_ulong *node; |
bec39940 | 1208 | struct lttng_ht_iter iter; |
f6a9efaa | 1209 | |
852d0037 | 1210 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 1211 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
1212 | if (node == NULL) { |
1213 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
1214 | goto error; |
1215 | } | |
852d0037 DG |
1216 | |
1217 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
1218 | |
1219 | error: | |
1220 | return NULL; | |
099e26bd DG |
1221 | } |
1222 | ||
d0b96690 DG |
1223 | /* |
1224 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
1225 | * be held before calling this helper function. | |
1226 | */ | |
1227 | static struct ust_app *find_app_by_notify_sock(int sock) | |
1228 | { | |
1229 | struct lttng_ht_node_ulong *node; | |
1230 | struct lttng_ht_iter iter; | |
1231 | ||
1232 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
1233 | &iter); | |
1234 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1235 | if (node == NULL) { | |
1236 | DBG2("UST app find by notify sock %d not found", sock); | |
1237 | goto error; | |
1238 | } | |
1239 | ||
1240 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
1241 | ||
1242 | error: | |
1243 | return NULL; | |
1244 | } | |
1245 | ||
025faf73 DG |
1246 | /* |
1247 | * Lookup for an ust app event based on event name, filter bytecode and the | |
1248 | * event loglevel. | |
1249 | * | |
1250 | * Return an ust_app_event object or NULL on error. | |
1251 | */ | |
18eace3b | 1252 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
2106efa0 PP |
1253 | char *name, struct lttng_filter_bytecode *filter, |
1254 | int loglevel_value, | |
39c5a3a7 | 1255 | const struct lttng_event_exclusion *exclusion) |
18eace3b DG |
1256 | { |
1257 | struct lttng_ht_iter iter; | |
1258 | struct lttng_ht_node_str *node; | |
1259 | struct ust_app_event *event = NULL; | |
1260 | struct ust_app_ht_key key; | |
18eace3b DG |
1261 | |
1262 | assert(name); | |
1263 | assert(ht); | |
1264 | ||
1265 | /* Setup key for event lookup. */ | |
1266 | key.name = name; | |
1267 | key.filter = filter; | |
2106efa0 | 1268 | key.loglevel_type = loglevel_value; |
39c5a3a7 | 1269 | /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */ |
51755dc8 | 1270 | key.exclusion = exclusion; |
18eace3b | 1271 | |
025faf73 DG |
1272 | /* Lookup using the event name as hash and a custom match fct. */ |
1273 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1274 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1275 | node = lttng_ht_iter_get_node_str(&iter); |
1276 | if (node == NULL) { | |
1277 | goto end; | |
1278 | } | |
1279 | ||
1280 | event = caa_container_of(node, struct ust_app_event, node); | |
1281 | ||
1282 | end: | |
18eace3b DG |
1283 | return event; |
1284 | } | |
1285 | ||
55cc08a6 DG |
1286 | /* |
1287 | * Create the channel context on the tracer. | |
d0b96690 DG |
1288 | * |
1289 | * Called with UST app session lock held. | |
55cc08a6 DG |
1290 | */ |
1291 | static | |
1292 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1293 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1294 | { | |
1295 | int ret; | |
1296 | ||
840cb59c | 1297 | health_code_update(); |
86acf0da | 1298 | |
fb45065e | 1299 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1300 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 | 1301 | ua_chan->obj, &ua_ctx->obj); |
fb45065e | 1302 | pthread_mutex_unlock(&app->sock_lock); |
55cc08a6 | 1303 | if (ret < 0) { |
ffe60014 DG |
1304 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1305 | ERR("UST app create channel context failed for app (pid: %d) " | |
1306 | "with ret %d", app->pid, ret); | |
1307 | } else { | |
3757b385 DG |
1308 | /* |
1309 | * This is normal behavior, an application can die during the | |
1310 | * creation process. Don't report an error so the execution can | |
1311 | * continue normally. | |
1312 | */ | |
1313 | ret = 0; | |
ffe60014 DG |
1314 | DBG3("UST app disable event failed. Application is dead."); |
1315 | } | |
55cc08a6 DG |
1316 | goto error; |
1317 | } | |
1318 | ||
1319 | ua_ctx->handle = ua_ctx->obj->handle; | |
1320 | ||
d0b96690 DG |
1321 | DBG2("UST app context handle %d created successfully for channel %s", |
1322 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1323 | |
1324 | error: | |
840cb59c | 1325 | health_code_update(); |
55cc08a6 DG |
1326 | return ret; |
1327 | } | |
1328 | ||
53a80697 MD |
1329 | /* |
1330 | * Set the filter on the tracer. | |
1331 | */ | |
1332 | static | |
1333 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
1334 | struct ust_app *app) | |
1335 | { | |
1336 | int ret; | |
51755dc8 | 1337 | struct lttng_ust_filter_bytecode *ust_bytecode = NULL; |
53a80697 | 1338 | |
840cb59c | 1339 | health_code_update(); |
86acf0da | 1340 | |
53a80697 | 1341 | if (!ua_event->filter) { |
86acf0da DG |
1342 | ret = 0; |
1343 | goto error; | |
53a80697 MD |
1344 | } |
1345 | ||
51755dc8 JG |
1346 | ust_bytecode = create_ust_bytecode_from_bytecode(ua_event->filter); |
1347 | if (!ust_bytecode) { | |
1348 | ret = -LTTNG_ERR_NOMEM; | |
1349 | goto error; | |
1350 | } | |
fb45065e | 1351 | pthread_mutex_lock(&app->sock_lock); |
51755dc8 | 1352 | ret = ustctl_set_filter(app->sock, ust_bytecode, |
53a80697 | 1353 | ua_event->obj); |
fb45065e | 1354 | pthread_mutex_unlock(&app->sock_lock); |
53a80697 | 1355 | if (ret < 0) { |
ffe60014 DG |
1356 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1357 | ERR("UST app event %s filter failed for app (pid: %d) " | |
1358 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1359 | } else { | |
3757b385 DG |
1360 | /* |
1361 | * This is normal behavior, an application can die during the | |
1362 | * creation process. Don't report an error so the execution can | |
1363 | * continue normally. | |
1364 | */ | |
1365 | ret = 0; | |
ffe60014 DG |
1366 | DBG3("UST app filter event failed. Application is dead."); |
1367 | } | |
53a80697 MD |
1368 | goto error; |
1369 | } | |
1370 | ||
1371 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
1372 | ||
1373 | error: | |
840cb59c | 1374 | health_code_update(); |
51755dc8 | 1375 | free(ust_bytecode); |
53a80697 MD |
1376 | return ret; |
1377 | } | |
1378 | ||
51755dc8 JG |
1379 | static |
1380 | struct lttng_ust_event_exclusion *create_ust_exclusion_from_exclusion( | |
1381 | struct lttng_event_exclusion *exclusion) | |
1382 | { | |
1383 | struct lttng_ust_event_exclusion *ust_exclusion = NULL; | |
1384 | size_t exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) + | |
1385 | LTTNG_UST_SYM_NAME_LEN * exclusion->count; | |
1386 | ||
1387 | ust_exclusion = zmalloc(exclusion_alloc_size); | |
1388 | if (!ust_exclusion) { | |
1389 | PERROR("malloc"); | |
1390 | goto end; | |
1391 | } | |
1392 | ||
1393 | assert(sizeof(struct lttng_event_exclusion) == | |
1394 | sizeof(struct lttng_ust_event_exclusion)); | |
1395 | memcpy(ust_exclusion, exclusion, exclusion_alloc_size); | |
1396 | end: | |
1397 | return ust_exclusion; | |
1398 | } | |
1399 | ||
7cc9a73c JI |
1400 | /* |
1401 | * Set event exclusions on the tracer. | |
1402 | */ | |
1403 | static | |
1404 | int set_ust_event_exclusion(struct ust_app_event *ua_event, | |
1405 | struct ust_app *app) | |
1406 | { | |
1407 | int ret; | |
51755dc8 | 1408 | struct lttng_ust_event_exclusion *ust_exclusion = NULL; |
7cc9a73c JI |
1409 | |
1410 | health_code_update(); | |
1411 | ||
1412 | if (!ua_event->exclusion || !ua_event->exclusion->count) { | |
1413 | ret = 0; | |
1414 | goto error; | |
1415 | } | |
1416 | ||
51755dc8 JG |
1417 | ust_exclusion = create_ust_exclusion_from_exclusion( |
1418 | ua_event->exclusion); | |
1419 | if (!ust_exclusion) { | |
1420 | ret = -LTTNG_ERR_NOMEM; | |
1421 | goto error; | |
1422 | } | |
fb45065e | 1423 | pthread_mutex_lock(&app->sock_lock); |
51755dc8 | 1424 | ret = ustctl_set_exclusion(app->sock, ust_exclusion, ua_event->obj); |
fb45065e | 1425 | pthread_mutex_unlock(&app->sock_lock); |
7cc9a73c JI |
1426 | if (ret < 0) { |
1427 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1428 | ERR("UST app event %s exclusions failed for app (pid: %d) " | |
1429 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1430 | } else { | |
1431 | /* | |
1432 | * This is normal behavior, an application can die during the | |
1433 | * creation process. Don't report an error so the execution can | |
1434 | * continue normally. | |
1435 | */ | |
1436 | ret = 0; | |
1437 | DBG3("UST app event exclusion failed. Application is dead."); | |
1438 | } | |
1439 | goto error; | |
1440 | } | |
1441 | ||
1442 | DBG2("UST exclusion set successfully for event %s", ua_event->name); | |
1443 | ||
1444 | error: | |
1445 | health_code_update(); | |
51755dc8 | 1446 | free(ust_exclusion); |
7cc9a73c JI |
1447 | return ret; |
1448 | } | |
1449 | ||
9730260e DG |
1450 | /* |
1451 | * Disable the specified event on to UST tracer for the UST session. | |
1452 | */ | |
1453 | static int disable_ust_event(struct ust_app *app, | |
1454 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1455 | { | |
1456 | int ret; | |
1457 | ||
840cb59c | 1458 | health_code_update(); |
86acf0da | 1459 | |
fb45065e | 1460 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1461 | ret = ustctl_disable(app->sock, ua_event->obj); |
fb45065e | 1462 | pthread_mutex_unlock(&app->sock_lock); |
9730260e | 1463 | if (ret < 0) { |
ffe60014 DG |
1464 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1465 | ERR("UST app event %s disable failed for app (pid: %d) " | |
1466 | "and session handle %d with ret %d", | |
1467 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1468 | } else { | |
3757b385 DG |
1469 | /* |
1470 | * This is normal behavior, an application can die during the | |
1471 | * creation process. Don't report an error so the execution can | |
1472 | * continue normally. | |
1473 | */ | |
1474 | ret = 0; | |
ffe60014 DG |
1475 | DBG3("UST app disable event failed. Application is dead."); |
1476 | } | |
9730260e DG |
1477 | goto error; |
1478 | } | |
1479 | ||
1480 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 1481 | ua_event->attr.name, app->pid); |
9730260e DG |
1482 | |
1483 | error: | |
840cb59c | 1484 | health_code_update(); |
9730260e DG |
1485 | return ret; |
1486 | } | |
1487 | ||
78f0bacd DG |
1488 | /* |
1489 | * Disable the specified channel on to UST tracer for the UST session. | |
1490 | */ | |
1491 | static int disable_ust_channel(struct ust_app *app, | |
1492 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1493 | { | |
1494 | int ret; | |
1495 | ||
840cb59c | 1496 | health_code_update(); |
86acf0da | 1497 | |
fb45065e | 1498 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1499 | ret = ustctl_disable(app->sock, ua_chan->obj); |
fb45065e | 1500 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1501 | if (ret < 0) { |
ffe60014 DG |
1502 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1503 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1504 | "and session handle %d with ret %d", | |
1505 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1506 | } else { | |
3757b385 DG |
1507 | /* |
1508 | * This is normal behavior, an application can die during the | |
1509 | * creation process. Don't report an error so the execution can | |
1510 | * continue normally. | |
1511 | */ | |
1512 | ret = 0; | |
ffe60014 DG |
1513 | DBG3("UST app disable channel failed. Application is dead."); |
1514 | } | |
78f0bacd DG |
1515 | goto error; |
1516 | } | |
1517 | ||
78f0bacd | 1518 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1519 | ua_chan->name, app->pid); |
78f0bacd DG |
1520 | |
1521 | error: | |
840cb59c | 1522 | health_code_update(); |
78f0bacd DG |
1523 | return ret; |
1524 | } | |
1525 | ||
1526 | /* | |
1527 | * Enable the specified channel on to UST tracer for the UST session. | |
1528 | */ | |
1529 | static int enable_ust_channel(struct ust_app *app, | |
1530 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1531 | { | |
1532 | int ret; | |
1533 | ||
840cb59c | 1534 | health_code_update(); |
86acf0da | 1535 | |
fb45065e | 1536 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1537 | ret = ustctl_enable(app->sock, ua_chan->obj); |
fb45065e | 1538 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1539 | if (ret < 0) { |
ffe60014 DG |
1540 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1541 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1542 | "and session handle %d with ret %d", | |
1543 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1544 | } else { | |
3757b385 DG |
1545 | /* |
1546 | * This is normal behavior, an application can die during the | |
1547 | * creation process. Don't report an error so the execution can | |
1548 | * continue normally. | |
1549 | */ | |
1550 | ret = 0; | |
ffe60014 DG |
1551 | DBG3("UST app enable channel failed. Application is dead."); |
1552 | } | |
78f0bacd DG |
1553 | goto error; |
1554 | } | |
1555 | ||
1556 | ua_chan->enabled = 1; | |
1557 | ||
1558 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1559 | ua_chan->name, app->pid); |
78f0bacd DG |
1560 | |
1561 | error: | |
840cb59c | 1562 | health_code_update(); |
78f0bacd DG |
1563 | return ret; |
1564 | } | |
1565 | ||
edb67388 DG |
1566 | /* |
1567 | * Enable the specified event on to UST tracer for the UST session. | |
1568 | */ | |
1569 | static int enable_ust_event(struct ust_app *app, | |
1570 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1571 | { | |
1572 | int ret; | |
1573 | ||
840cb59c | 1574 | health_code_update(); |
86acf0da | 1575 | |
fb45065e | 1576 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1577 | ret = ustctl_enable(app->sock, ua_event->obj); |
fb45065e | 1578 | pthread_mutex_unlock(&app->sock_lock); |
edb67388 | 1579 | if (ret < 0) { |
ffe60014 DG |
1580 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1581 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1582 | "and session handle %d with ret %d", | |
1583 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1584 | } else { | |
3757b385 DG |
1585 | /* |
1586 | * This is normal behavior, an application can die during the | |
1587 | * creation process. Don't report an error so the execution can | |
1588 | * continue normally. | |
1589 | */ | |
1590 | ret = 0; | |
ffe60014 DG |
1591 | DBG3("UST app enable event failed. Application is dead."); |
1592 | } | |
edb67388 DG |
1593 | goto error; |
1594 | } | |
1595 | ||
1596 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1597 | ua_event->attr.name, app->pid); |
edb67388 DG |
1598 | |
1599 | error: | |
840cb59c | 1600 | health_code_update(); |
edb67388 DG |
1601 | return ret; |
1602 | } | |
1603 | ||
099e26bd | 1604 | /* |
7972aab2 | 1605 | * Send channel and stream buffer to application. |
4f3ab6ee | 1606 | * |
ffe60014 | 1607 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1608 | */ |
7972aab2 DG |
1609 | static int send_channel_pid_to_ust(struct ust_app *app, |
1610 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1611 | { |
1612 | int ret; | |
ffe60014 | 1613 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1614 | |
1615 | assert(app); | |
ffe60014 | 1616 | assert(ua_sess); |
4f3ab6ee | 1617 | assert(ua_chan); |
4f3ab6ee | 1618 | |
840cb59c | 1619 | health_code_update(); |
4f3ab6ee | 1620 | |
7972aab2 DG |
1621 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1622 | app->sock); | |
86acf0da | 1623 | |
ffe60014 DG |
1624 | /* Send channel to the application. */ |
1625 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
1626 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1627 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1628 | goto error; | |
1629 | } else if (ret < 0) { | |
b551a063 DG |
1630 | goto error; |
1631 | } | |
1632 | ||
d88aee68 DG |
1633 | health_code_update(); |
1634 | ||
ffe60014 DG |
1635 | /* Send all streams to application. */ |
1636 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1637 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
a7169585 MD |
1638 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1639 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1640 | goto error; | |
1641 | } else if (ret < 0) { | |
ffe60014 DG |
1642 | goto error; |
1643 | } | |
1644 | /* We don't need the stream anymore once sent to the tracer. */ | |
1645 | cds_list_del(&stream->list); | |
fb45065e | 1646 | delete_ust_app_stream(-1, stream, app); |
ffe60014 | 1647 | } |
ffe60014 DG |
1648 | /* Flag the channel that it is sent to the application. */ |
1649 | ua_chan->is_sent = 1; | |
ffe60014 | 1650 | |
b551a063 | 1651 | error: |
840cb59c | 1652 | health_code_update(); |
b551a063 DG |
1653 | return ret; |
1654 | } | |
1655 | ||
91d76f53 | 1656 | /* |
5b4a0ec0 | 1657 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1658 | * |
1659 | * Should be called with session mutex held. | |
91d76f53 | 1660 | */ |
edb67388 DG |
1661 | static |
1662 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1663 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1664 | { |
5b4a0ec0 | 1665 | int ret = 0; |
284d8f55 | 1666 | |
840cb59c | 1667 | health_code_update(); |
86acf0da | 1668 | |
5b4a0ec0 | 1669 | /* Create UST event on tracer */ |
fb45065e | 1670 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1671 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 | 1672 | &ua_event->obj); |
fb45065e | 1673 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 | 1674 | if (ret < 0) { |
ffe60014 DG |
1675 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1676 | ERR("Error ustctl create event %s for app pid: %d with ret %d", | |
1677 | ua_event->attr.name, app->pid, ret); | |
1678 | } else { | |
3757b385 DG |
1679 | /* |
1680 | * This is normal behavior, an application can die during the | |
1681 | * creation process. Don't report an error so the execution can | |
1682 | * continue normally. | |
1683 | */ | |
1684 | ret = 0; | |
ffe60014 DG |
1685 | DBG3("UST app create event failed. Application is dead."); |
1686 | } | |
5b4a0ec0 | 1687 | goto error; |
91d76f53 | 1688 | } |
f6a9efaa | 1689 | |
5b4a0ec0 | 1690 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1691 | |
5b4a0ec0 | 1692 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1693 | ua_event->attr.name, app->pid); |
f6a9efaa | 1694 | |
840cb59c | 1695 | health_code_update(); |
86acf0da | 1696 | |
025faf73 DG |
1697 | /* Set filter if one is present. */ |
1698 | if (ua_event->filter) { | |
1699 | ret = set_ust_event_filter(ua_event, app); | |
1700 | if (ret < 0) { | |
1701 | goto error; | |
1702 | } | |
1703 | } | |
1704 | ||
7cc9a73c JI |
1705 | /* Set exclusions for the event */ |
1706 | if (ua_event->exclusion) { | |
1707 | ret = set_ust_event_exclusion(ua_event, app); | |
1708 | if (ret < 0) { | |
1709 | goto error; | |
1710 | } | |
1711 | } | |
1712 | ||
8535a6d9 | 1713 | /* If event not enabled, disable it on the tracer */ |
40113787 MD |
1714 | if (ua_event->enabled) { |
1715 | /* | |
1716 | * We now need to explicitly enable the event, since it | |
1717 | * is now disabled at creation. | |
1718 | */ | |
1719 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1720 | if (ret < 0) { | |
1721 | /* | |
1722 | * If we hit an EPERM, something is wrong with our enable call. If | |
1723 | * we get an EEXIST, there is a problem on the tracer side since we | |
1724 | * just created it. | |
1725 | */ | |
1726 | switch (ret) { | |
1727 | case -LTTNG_UST_ERR_PERM: | |
1728 | /* Code flow problem */ | |
1729 | assert(0); | |
1730 | case -LTTNG_UST_ERR_EXIST: | |
1731 | /* It's OK for our use case. */ | |
1732 | ret = 0; | |
1733 | break; | |
1734 | default: | |
1735 | break; | |
1736 | } | |
1737 | goto error; | |
1738 | } | |
8535a6d9 DG |
1739 | } |
1740 | ||
5b4a0ec0 | 1741 | error: |
840cb59c | 1742 | health_code_update(); |
5b4a0ec0 | 1743 | return ret; |
91d76f53 | 1744 | } |
48842b30 | 1745 | |
5b4a0ec0 DG |
1746 | /* |
1747 | * Copy data between an UST app event and a LTT event. | |
1748 | */ | |
421cb601 | 1749 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1750 | struct ltt_ust_event *uevent) |
1751 | { | |
b4ffad32 JI |
1752 | size_t exclusion_alloc_size; |
1753 | ||
48842b30 DG |
1754 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); |
1755 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1756 | ||
fc34caaa DG |
1757 | ua_event->enabled = uevent->enabled; |
1758 | ||
5b4a0ec0 DG |
1759 | /* Copy event attributes */ |
1760 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1761 | ||
53a80697 MD |
1762 | /* Copy filter bytecode */ |
1763 | if (uevent->filter) { | |
51755dc8 | 1764 | ua_event->filter = copy_filter_bytecode(uevent->filter); |
025faf73 | 1765 | /* Filter might be NULL here in case of ENONEM. */ |
53a80697 | 1766 | } |
b4ffad32 JI |
1767 | |
1768 | /* Copy exclusion data */ | |
1769 | if (uevent->exclusion) { | |
51755dc8 | 1770 | exclusion_alloc_size = sizeof(struct lttng_event_exclusion) + |
b4ffad32 JI |
1771 | LTTNG_UST_SYM_NAME_LEN * uevent->exclusion->count; |
1772 | ua_event->exclusion = zmalloc(exclusion_alloc_size); | |
5f8df26c JI |
1773 | if (ua_event->exclusion == NULL) { |
1774 | PERROR("malloc"); | |
1775 | } else { | |
1776 | memcpy(ua_event->exclusion, uevent->exclusion, | |
1777 | exclusion_alloc_size); | |
b4ffad32 JI |
1778 | } |
1779 | } | |
48842b30 DG |
1780 | } |
1781 | ||
5b4a0ec0 DG |
1782 | /* |
1783 | * Copy data between an UST app channel and a LTT channel. | |
1784 | */ | |
421cb601 | 1785 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1786 | struct ltt_ust_channel *uchan) |
1787 | { | |
bec39940 | 1788 | struct lttng_ht_iter iter; |
48842b30 | 1789 | struct ltt_ust_event *uevent; |
55cc08a6 | 1790 | struct ltt_ust_context *uctx; |
48842b30 DG |
1791 | struct ust_app_event *ua_event; |
1792 | ||
fc34caaa | 1793 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1794 | |
1795 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1796 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 1797 | |
1624d5b7 JD |
1798 | ua_chan->tracefile_size = uchan->tracefile_size; |
1799 | ua_chan->tracefile_count = uchan->tracefile_count; | |
1800 | ||
ffe60014 DG |
1801 | /* Copy event attributes since the layout is different. */ |
1802 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1803 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1804 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1805 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1806 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
e9404c27 | 1807 | ua_chan->monitor_timer_interval = uchan->monitor_timer_interval; |
ffe60014 | 1808 | ua_chan->attr.output = uchan->attr.output; |
491d1539 MD |
1809 | ua_chan->attr.blocking_timeout = uchan->attr.u.s.blocking_timeout; |
1810 | ||
ffe60014 DG |
1811 | /* |
1812 | * Note that the attribute channel type is not set since the channel on the | |
1813 | * tracing registry side does not have this information. | |
1814 | */ | |
48842b30 | 1815 | |
fc34caaa | 1816 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1817 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1818 | |
31746f93 | 1819 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { |
bdf64013 JG |
1820 | struct ust_app_ctx *ua_ctx = alloc_ust_app_ctx(&uctx->ctx); |
1821 | ||
55cc08a6 DG |
1822 | if (ua_ctx == NULL) { |
1823 | continue; | |
1824 | } | |
bec39940 DG |
1825 | lttng_ht_node_init_ulong(&ua_ctx->node, |
1826 | (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 1827 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 1828 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
55cc08a6 | 1829 | } |
48842b30 | 1830 | |
421cb601 | 1831 | /* Copy all events from ltt ust channel to ust app channel */ |
bec39940 | 1832 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
18eace3b | 1833 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 1834 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 1835 | if (ua_event == NULL) { |
421cb601 | 1836 | DBG2("UST event %s not found on shadow copy channel", |
48842b30 | 1837 | uevent->attr.name); |
284d8f55 | 1838 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
48842b30 | 1839 | if (ua_event == NULL) { |
5b4a0ec0 | 1840 | continue; |
48842b30 | 1841 | } |
421cb601 | 1842 | shadow_copy_event(ua_event, uevent); |
d0b96690 | 1843 | add_unique_ust_app_event(ua_chan, ua_event); |
48842b30 | 1844 | } |
48842b30 DG |
1845 | } |
1846 | ||
fc34caaa | 1847 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1848 | } |
1849 | ||
5b4a0ec0 DG |
1850 | /* |
1851 | * Copy data between a UST app session and a regular LTT session. | |
1852 | */ | |
421cb601 | 1853 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1854 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1855 | { |
bec39940 DG |
1856 | struct lttng_ht_node_str *ua_chan_node; |
1857 | struct lttng_ht_iter iter; | |
48842b30 DG |
1858 | struct ltt_ust_channel *uchan; |
1859 | struct ust_app_channel *ua_chan; | |
477d7741 MD |
1860 | time_t rawtime; |
1861 | struct tm *timeinfo; | |
1862 | char datetime[16]; | |
1863 | int ret; | |
d7ba1388 | 1864 | char tmp_shm_path[PATH_MAX]; |
477d7741 MD |
1865 | |
1866 | /* Get date and time for unique app path */ | |
1867 | time(&rawtime); | |
1868 | timeinfo = localtime(&rawtime); | |
1869 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1870 | |
421cb601 | 1871 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1872 | |
7972aab2 DG |
1873 | ua_sess->tracing_id = usess->id; |
1874 | ua_sess->id = get_next_session_id(); | |
1875 | ua_sess->uid = app->uid; | |
1876 | ua_sess->gid = app->gid; | |
1877 | ua_sess->euid = usess->uid; | |
1878 | ua_sess->egid = usess->gid; | |
1879 | ua_sess->buffer_type = usess->buffer_type; | |
1880 | ua_sess->bits_per_long = app->bits_per_long; | |
6addfa37 | 1881 | |
7972aab2 | 1882 | /* There is only one consumer object per session possible. */ |
6addfa37 | 1883 | consumer_output_get(usess->consumer); |
7972aab2 | 1884 | ua_sess->consumer = usess->consumer; |
6addfa37 | 1885 | |
2bba9e53 | 1886 | ua_sess->output_traces = usess->output_traces; |
ecc48a90 | 1887 | ua_sess->live_timer_interval = usess->live_timer_interval; |
84ad93e8 DG |
1888 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, |
1889 | &usess->metadata_attr); | |
7972aab2 DG |
1890 | |
1891 | switch (ua_sess->buffer_type) { | |
1892 | case LTTNG_BUFFER_PER_PID: | |
1893 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 1894 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
1895 | datetime); |
1896 | break; | |
1897 | case LTTNG_BUFFER_PER_UID: | |
1898 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1899 | DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long); | |
1900 | break; | |
1901 | default: | |
1902 | assert(0); | |
1903 | goto error; | |
1904 | } | |
477d7741 MD |
1905 | if (ret < 0) { |
1906 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1907 | assert(0); |
7972aab2 | 1908 | goto error; |
477d7741 MD |
1909 | } |
1910 | ||
3d071855 MD |
1911 | strncpy(ua_sess->root_shm_path, usess->root_shm_path, |
1912 | sizeof(ua_sess->root_shm_path)); | |
1913 | ua_sess->root_shm_path[sizeof(ua_sess->root_shm_path) - 1] = '\0'; | |
d7ba1388 MD |
1914 | strncpy(ua_sess->shm_path, usess->shm_path, |
1915 | sizeof(ua_sess->shm_path)); | |
1916 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
1917 | if (ua_sess->shm_path[0]) { | |
1918 | switch (ua_sess->buffer_type) { | |
1919 | case LTTNG_BUFFER_PER_PID: | |
1920 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
1921 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", | |
1922 | app->name, app->pid, datetime); | |
1923 | break; | |
1924 | case LTTNG_BUFFER_PER_UID: | |
1925 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
1926 | DEFAULT_UST_TRACE_UID_PATH, | |
1927 | app->uid, app->bits_per_long); | |
1928 | break; | |
1929 | default: | |
1930 | assert(0); | |
1931 | goto error; | |
1932 | } | |
1933 | if (ret < 0) { | |
1934 | PERROR("sprintf UST shadow copy session"); | |
1935 | assert(0); | |
1936 | goto error; | |
1937 | } | |
1938 | strncat(ua_sess->shm_path, tmp_shm_path, | |
1939 | sizeof(ua_sess->shm_path) - strlen(ua_sess->shm_path) - 1); | |
1940 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
1941 | } | |
1942 | ||
48842b30 | 1943 | /* Iterate over all channels in global domain. */ |
bec39940 DG |
1944 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, |
1945 | uchan, node.node) { | |
1946 | struct lttng_ht_iter uiter; | |
ba767faf | 1947 | |
bec39940 DG |
1948 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
1949 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
5b4a0ec0 | 1950 | if (ua_chan_node != NULL) { |
fc34caaa | 1951 | /* Session exist. Contiuing. */ |
5b4a0ec0 DG |
1952 | continue; |
1953 | } | |
421cb601 | 1954 | |
5b4a0ec0 DG |
1955 | DBG2("Channel %s not found on shadow session copy, creating it", |
1956 | uchan->name); | |
fb83fe64 JD |
1957 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, |
1958 | &uchan->attr); | |
5b4a0ec0 | 1959 | if (ua_chan == NULL) { |
fc34caaa | 1960 | /* malloc failed FIXME: Might want to do handle ENOMEM .. */ |
5b4a0ec0 | 1961 | continue; |
48842b30 | 1962 | } |
5b4a0ec0 | 1963 | shadow_copy_channel(ua_chan, uchan); |
ffe60014 DG |
1964 | /* |
1965 | * The concept of metadata channel does not exist on the tracing | |
1966 | * registry side of the session daemon so this can only be a per CPU | |
1967 | * channel and not metadata. | |
1968 | */ | |
1969 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
1970 | ||
bec39940 | 1971 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); |
48842b30 | 1972 | } |
6addfa37 | 1973 | return; |
7972aab2 DG |
1974 | |
1975 | error: | |
6addfa37 | 1976 | consumer_output_put(ua_sess->consumer); |
48842b30 DG |
1977 | } |
1978 | ||
78f0bacd DG |
1979 | /* |
1980 | * Lookup sesison wrapper. | |
1981 | */ | |
84cd17c6 MD |
1982 | static |
1983 | void __lookup_session_by_app(struct ltt_ust_session *usess, | |
bec39940 | 1984 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1985 | { |
1986 | /* Get right UST app session from app */ | |
d9bf3ca4 | 1987 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
1988 | } |
1989 | ||
421cb601 DG |
1990 | /* |
1991 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1992 | * id. |
421cb601 | 1993 | */ |
48842b30 DG |
1994 | static struct ust_app_session *lookup_session_by_app( |
1995 | struct ltt_ust_session *usess, struct ust_app *app) | |
1996 | { | |
bec39940 | 1997 | struct lttng_ht_iter iter; |
d9bf3ca4 | 1998 | struct lttng_ht_node_u64 *node; |
48842b30 | 1999 | |
84cd17c6 | 2000 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 2001 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
2002 | if (node == NULL) { |
2003 | goto error; | |
2004 | } | |
2005 | ||
2006 | return caa_container_of(node, struct ust_app_session, node); | |
2007 | ||
2008 | error: | |
2009 | return NULL; | |
2010 | } | |
2011 | ||
7972aab2 DG |
2012 | /* |
2013 | * Setup buffer registry per PID for the given session and application. If none | |
2014 | * is found, a new one is created, added to the global registry and | |
2015 | * initialized. If regp is valid, it's set with the newly created object. | |
2016 | * | |
2017 | * Return 0 on success or else a negative value. | |
2018 | */ | |
2019 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
2020 | struct ust_app *app, struct buffer_reg_pid **regp) | |
2021 | { | |
2022 | int ret = 0; | |
2023 | struct buffer_reg_pid *reg_pid; | |
2024 | ||
2025 | assert(ua_sess); | |
2026 | assert(app); | |
2027 | ||
2028 | rcu_read_lock(); | |
2029 | ||
2030 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
2031 | if (!reg_pid) { | |
2032 | /* | |
2033 | * This is the create channel path meaning that if there is NO | |
2034 | * registry available, we have to create one for this session. | |
2035 | */ | |
d7ba1388 | 2036 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid, |
3d071855 | 2037 | ua_sess->root_shm_path, ua_sess->shm_path); |
7972aab2 DG |
2038 | if (ret < 0) { |
2039 | goto error; | |
2040 | } | |
7972aab2 DG |
2041 | } else { |
2042 | goto end; | |
2043 | } | |
2044 | ||
2045 | /* Initialize registry. */ | |
2046 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
2047 | app->bits_per_long, app->uint8_t_alignment, | |
2048 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
2049 | app->uint64_t_alignment, app->long_alignment, |
2050 | app->byte_order, app->version.major, | |
3d071855 MD |
2051 | app->version.minor, reg_pid->root_shm_path, |
2052 | reg_pid->shm_path, | |
d7ba1388 | 2053 | ua_sess->euid, ua_sess->egid); |
7972aab2 | 2054 | if (ret < 0) { |
286c991a MD |
2055 | /* |
2056 | * reg_pid->registry->reg.ust is NULL upon error, so we need to | |
2057 | * destroy the buffer registry, because it is always expected | |
2058 | * that if the buffer registry can be found, its ust registry is | |
2059 | * non-NULL. | |
2060 | */ | |
2061 | buffer_reg_pid_destroy(reg_pid); | |
7972aab2 DG |
2062 | goto error; |
2063 | } | |
2064 | ||
286c991a MD |
2065 | buffer_reg_pid_add(reg_pid); |
2066 | ||
7972aab2 DG |
2067 | DBG3("UST app buffer registry per PID created successfully"); |
2068 | ||
2069 | end: | |
2070 | if (regp) { | |
2071 | *regp = reg_pid; | |
2072 | } | |
2073 | error: | |
2074 | rcu_read_unlock(); | |
2075 | return ret; | |
2076 | } | |
2077 | ||
2078 | /* | |
2079 | * Setup buffer registry per UID for the given session and application. If none | |
2080 | * is found, a new one is created, added to the global registry and | |
2081 | * initialized. If regp is valid, it's set with the newly created object. | |
2082 | * | |
2083 | * Return 0 on success or else a negative value. | |
2084 | */ | |
2085 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
d7ba1388 | 2086 | struct ust_app_session *ua_sess, |
7972aab2 DG |
2087 | struct ust_app *app, struct buffer_reg_uid **regp) |
2088 | { | |
2089 | int ret = 0; | |
2090 | struct buffer_reg_uid *reg_uid; | |
2091 | ||
2092 | assert(usess); | |
2093 | assert(app); | |
2094 | ||
2095 | rcu_read_lock(); | |
2096 | ||
2097 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2098 | if (!reg_uid) { | |
2099 | /* | |
2100 | * This is the create channel path meaning that if there is NO | |
2101 | * registry available, we have to create one for this session. | |
2102 | */ | |
2103 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
3d071855 MD |
2104 | LTTNG_DOMAIN_UST, ®_uid, |
2105 | ua_sess->root_shm_path, ua_sess->shm_path); | |
7972aab2 DG |
2106 | if (ret < 0) { |
2107 | goto error; | |
2108 | } | |
7972aab2 DG |
2109 | } else { |
2110 | goto end; | |
2111 | } | |
2112 | ||
2113 | /* Initialize registry. */ | |
af6142cf | 2114 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
2115 | app->bits_per_long, app->uint8_t_alignment, |
2116 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
2117 | app->uint64_t_alignment, app->long_alignment, |
2118 | app->byte_order, app->version.major, | |
3d071855 MD |
2119 | app->version.minor, reg_uid->root_shm_path, |
2120 | reg_uid->shm_path, usess->uid, usess->gid); | |
7972aab2 | 2121 | if (ret < 0) { |
286c991a MD |
2122 | /* |
2123 | * reg_uid->registry->reg.ust is NULL upon error, so we need to | |
2124 | * destroy the buffer registry, because it is always expected | |
2125 | * that if the buffer registry can be found, its ust registry is | |
2126 | * non-NULL. | |
2127 | */ | |
2128 | buffer_reg_uid_destroy(reg_uid, NULL); | |
7972aab2 DG |
2129 | goto error; |
2130 | } | |
2131 | /* Add node to teardown list of the session. */ | |
2132 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
2133 | ||
286c991a | 2134 | buffer_reg_uid_add(reg_uid); |
7972aab2 | 2135 | |
286c991a | 2136 | DBG3("UST app buffer registry per UID created successfully"); |
7972aab2 DG |
2137 | end: |
2138 | if (regp) { | |
2139 | *regp = reg_uid; | |
2140 | } | |
2141 | error: | |
2142 | rcu_read_unlock(); | |
2143 | return ret; | |
2144 | } | |
2145 | ||
421cb601 | 2146 | /* |
3d8ca23b | 2147 | * Create a session on the tracer side for the given app. |
421cb601 | 2148 | * |
3d8ca23b DG |
2149 | * On success, ua_sess_ptr is populated with the session pointer or else left |
2150 | * untouched. If the session was created, is_created is set to 1. On error, | |
2151 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
2152 | * be NULL. | |
2153 | * | |
2154 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
2155 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 2156 | */ |
03f91eaa | 2157 | static int find_or_create_ust_app_session(struct ltt_ust_session *usess, |
3d8ca23b DG |
2158 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, |
2159 | int *is_created) | |
421cb601 | 2160 | { |
3d8ca23b | 2161 | int ret, created = 0; |
421cb601 DG |
2162 | struct ust_app_session *ua_sess; |
2163 | ||
3d8ca23b DG |
2164 | assert(usess); |
2165 | assert(app); | |
2166 | assert(ua_sess_ptr); | |
2167 | ||
840cb59c | 2168 | health_code_update(); |
86acf0da | 2169 | |
421cb601 DG |
2170 | ua_sess = lookup_session_by_app(usess, app); |
2171 | if (ua_sess == NULL) { | |
d9bf3ca4 | 2172 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 2173 | app->pid, usess->id); |
40bbd087 | 2174 | ua_sess = alloc_ust_app_session(); |
421cb601 DG |
2175 | if (ua_sess == NULL) { |
2176 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
2177 | ret = -ENOMEM; |
2178 | goto error; | |
421cb601 | 2179 | } |
477d7741 | 2180 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 2181 | created = 1; |
421cb601 DG |
2182 | } |
2183 | ||
7972aab2 DG |
2184 | switch (usess->buffer_type) { |
2185 | case LTTNG_BUFFER_PER_PID: | |
2186 | /* Init local registry. */ | |
2187 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 2188 | if (ret < 0) { |
e64207cf | 2189 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2190 | goto error; |
2191 | } | |
2192 | break; | |
2193 | case LTTNG_BUFFER_PER_UID: | |
2194 | /* Look for a global registry. If none exists, create one. */ | |
d7ba1388 | 2195 | ret = setup_buffer_reg_uid(usess, ua_sess, app, NULL); |
7972aab2 | 2196 | if (ret < 0) { |
e64207cf | 2197 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2198 | goto error; |
2199 | } | |
2200 | break; | |
2201 | default: | |
2202 | assert(0); | |
2203 | ret = -EINVAL; | |
2204 | goto error; | |
2205 | } | |
2206 | ||
2207 | health_code_update(); | |
2208 | ||
2209 | if (ua_sess->handle == -1) { | |
fb45065e | 2210 | pthread_mutex_lock(&app->sock_lock); |
7972aab2 | 2211 | ret = ustctl_create_session(app->sock); |
fb45065e | 2212 | pthread_mutex_unlock(&app->sock_lock); |
7972aab2 DG |
2213 | if (ret < 0) { |
2214 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
2215 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
2216 | app->pid, ret); |
2217 | } else { | |
2218 | DBG("UST app creating session failed. Application is dead"); | |
3757b385 DG |
2219 | /* |
2220 | * This is normal behavior, an application can die during the | |
2221 | * creation process. Don't report an error so the execution can | |
2222 | * continue normally. This will get flagged ENOTCONN and the | |
2223 | * caller will handle it. | |
2224 | */ | |
2225 | ret = 0; | |
ffe60014 | 2226 | } |
d0b96690 | 2227 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
2228 | if (ret != -ENOMEM) { |
2229 | /* | |
2230 | * Tracer is probably gone or got an internal error so let's | |
2231 | * behave like it will soon unregister or not usable. | |
2232 | */ | |
2233 | ret = -ENOTCONN; | |
2234 | } | |
2235 | goto error; | |
421cb601 DG |
2236 | } |
2237 | ||
7972aab2 DG |
2238 | ua_sess->handle = ret; |
2239 | ||
2240 | /* Add ust app session to app's HT */ | |
d9bf3ca4 MD |
2241 | lttng_ht_node_init_u64(&ua_sess->node, |
2242 | ua_sess->tracing_id); | |
2243 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
10b56aef MD |
2244 | lttng_ht_node_init_ulong(&ua_sess->ust_objd_node, ua_sess->handle); |
2245 | lttng_ht_add_unique_ulong(app->ust_sessions_objd, | |
2246 | &ua_sess->ust_objd_node); | |
7972aab2 DG |
2247 | |
2248 | DBG2("UST app session created successfully with handle %d", ret); | |
2249 | } | |
2250 | ||
2251 | *ua_sess_ptr = ua_sess; | |
2252 | if (is_created) { | |
2253 | *is_created = created; | |
2254 | } | |
2255 | ||
2256 | /* Everything went well. */ | |
2257 | ret = 0; | |
2258 | ||
2259 | error: | |
2260 | health_code_update(); | |
2261 | return ret; | |
2262 | } | |
2263 | ||
6a6b2068 JG |
2264 | /* |
2265 | * Match function for a hash table lookup of ust_app_ctx. | |
2266 | * | |
2267 | * It matches an ust app context based on the context type and, in the case | |
2268 | * of perf counters, their name. | |
2269 | */ | |
2270 | static int ht_match_ust_app_ctx(struct cds_lfht_node *node, const void *_key) | |
2271 | { | |
2272 | struct ust_app_ctx *ctx; | |
bdf64013 | 2273 | const struct lttng_ust_context_attr *key; |
6a6b2068 JG |
2274 | |
2275 | assert(node); | |
2276 | assert(_key); | |
2277 | ||
2278 | ctx = caa_container_of(node, struct ust_app_ctx, node.node); | |
2279 | key = _key; | |
2280 | ||
2281 | /* Context type */ | |
2282 | if (ctx->ctx.ctx != key->ctx) { | |
2283 | goto no_match; | |
2284 | } | |
2285 | ||
bdf64013 JG |
2286 | switch(key->ctx) { |
2287 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: | |
6a6b2068 | 2288 | if (strncmp(key->u.perf_counter.name, |
bdf64013 JG |
2289 | ctx->ctx.u.perf_counter.name, |
2290 | sizeof(key->u.perf_counter.name))) { | |
2291 | goto no_match; | |
2292 | } | |
2293 | break; | |
2294 | case LTTNG_UST_CONTEXT_APP_CONTEXT: | |
2295 | if (strcmp(key->u.app_ctx.provider_name, | |
2296 | ctx->ctx.u.app_ctx.provider_name) || | |
2297 | strcmp(key->u.app_ctx.ctx_name, | |
2298 | ctx->ctx.u.app_ctx.ctx_name)) { | |
6a6b2068 JG |
2299 | goto no_match; |
2300 | } | |
bdf64013 JG |
2301 | break; |
2302 | default: | |
2303 | break; | |
6a6b2068 JG |
2304 | } |
2305 | ||
2306 | /* Match. */ | |
2307 | return 1; | |
2308 | ||
2309 | no_match: | |
2310 | return 0; | |
2311 | } | |
2312 | ||
2313 | /* | |
2314 | * Lookup for an ust app context from an lttng_ust_context. | |
2315 | * | |
be184a0f | 2316 | * Must be called while holding RCU read side lock. |
6a6b2068 JG |
2317 | * Return an ust_app_ctx object or NULL on error. |
2318 | */ | |
2319 | static | |
2320 | struct ust_app_ctx *find_ust_app_context(struct lttng_ht *ht, | |
bdf64013 | 2321 | struct lttng_ust_context_attr *uctx) |
6a6b2068 JG |
2322 | { |
2323 | struct lttng_ht_iter iter; | |
2324 | struct lttng_ht_node_ulong *node; | |
2325 | struct ust_app_ctx *app_ctx = NULL; | |
2326 | ||
2327 | assert(uctx); | |
2328 | assert(ht); | |
2329 | ||
2330 | /* Lookup using the lttng_ust_context_type and a custom match fct. */ | |
2331 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) uctx->ctx, lttng_ht_seed), | |
2332 | ht_match_ust_app_ctx, uctx, &iter.iter); | |
2333 | node = lttng_ht_iter_get_node_ulong(&iter); | |
2334 | if (!node) { | |
2335 | goto end; | |
2336 | } | |
2337 | ||
2338 | app_ctx = caa_container_of(node, struct ust_app_ctx, node); | |
2339 | ||
2340 | end: | |
2341 | return app_ctx; | |
2342 | } | |
2343 | ||
7972aab2 DG |
2344 | /* |
2345 | * Create a context for the channel on the tracer. | |
2346 | * | |
2347 | * Called with UST app session lock held and a RCU read side lock. | |
2348 | */ | |
2349 | static | |
c9edf082 | 2350 | int create_ust_app_channel_context(struct ust_app_channel *ua_chan, |
bdf64013 | 2351 | struct lttng_ust_context_attr *uctx, |
7972aab2 DG |
2352 | struct ust_app *app) |
2353 | { | |
2354 | int ret = 0; | |
7972aab2 DG |
2355 | struct ust_app_ctx *ua_ctx; |
2356 | ||
2357 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
2358 | ||
6a6b2068 JG |
2359 | ua_ctx = find_ust_app_context(ua_chan->ctx, uctx); |
2360 | if (ua_ctx) { | |
7972aab2 DG |
2361 | ret = -EEXIST; |
2362 | goto error; | |
2363 | } | |
2364 | ||
2365 | ua_ctx = alloc_ust_app_ctx(uctx); | |
2366 | if (ua_ctx == NULL) { | |
2367 | /* malloc failed */ | |
7682f304 | 2368 | ret = -ENOMEM; |
7972aab2 DG |
2369 | goto error; |
2370 | } | |
2371 | ||
2372 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 2373 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 2374 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
2375 | |
2376 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
2377 | if (ret < 0) { | |
2378 | goto error; | |
2379 | } | |
2380 | ||
2381 | error: | |
2382 | return ret; | |
2383 | } | |
2384 | ||
2385 | /* | |
2386 | * Enable on the tracer side a ust app event for the session and channel. | |
2387 | * | |
2388 | * Called with UST app session lock held. | |
2389 | */ | |
2390 | static | |
2391 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
2392 | struct ust_app_event *ua_event, struct ust_app *app) | |
2393 | { | |
2394 | int ret; | |
2395 | ||
2396 | ret = enable_ust_event(app, ua_sess, ua_event); | |
2397 | if (ret < 0) { | |
2398 | goto error; | |
2399 | } | |
2400 | ||
2401 | ua_event->enabled = 1; | |
2402 | ||
2403 | error: | |
2404 | return ret; | |
2405 | } | |
2406 | ||
2407 | /* | |
2408 | * Disable on the tracer side a ust app event for the session and channel. | |
2409 | */ | |
2410 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
2411 | struct ust_app_event *ua_event, struct ust_app *app) | |
2412 | { | |
2413 | int ret; | |
2414 | ||
2415 | ret = disable_ust_event(app, ua_sess, ua_event); | |
2416 | if (ret < 0) { | |
2417 | goto error; | |
2418 | } | |
2419 | ||
2420 | ua_event->enabled = 0; | |
2421 | ||
2422 | error: | |
2423 | return ret; | |
2424 | } | |
2425 | ||
2426 | /* | |
2427 | * Lookup ust app channel for session and disable it on the tracer side. | |
2428 | */ | |
2429 | static | |
2430 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
2431 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
2432 | { | |
2433 | int ret; | |
2434 | ||
2435 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2436 | if (ret < 0) { | |
2437 | goto error; | |
2438 | } | |
2439 | ||
2440 | ua_chan->enabled = 0; | |
2441 | ||
2442 | error: | |
2443 | return ret; | |
2444 | } | |
2445 | ||
2446 | /* | |
2447 | * Lookup ust app channel for session and enable it on the tracer side. This | |
2448 | * MUST be called with a RCU read side lock acquired. | |
2449 | */ | |
2450 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
2451 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
2452 | { | |
2453 | int ret = 0; | |
2454 | struct lttng_ht_iter iter; | |
2455 | struct lttng_ht_node_str *ua_chan_node; | |
2456 | struct ust_app_channel *ua_chan; | |
2457 | ||
2458 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
2459 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
2460 | if (ua_chan_node == NULL) { | |
d9bf3ca4 | 2461 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
2462 | uchan->name, ua_sess->tracing_id); |
2463 | goto error; | |
2464 | } | |
2465 | ||
2466 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2467 | ||
2468 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
2469 | if (ret < 0) { | |
2470 | goto error; | |
2471 | } | |
2472 | ||
2473 | error: | |
2474 | return ret; | |
2475 | } | |
2476 | ||
2477 | /* | |
2478 | * Ask the consumer to create a channel and get it if successful. | |
2479 | * | |
fad1ed2f JR |
2480 | * Called with UST app session lock held. |
2481 | * | |
7972aab2 DG |
2482 | * Return 0 on success or else a negative value. |
2483 | */ | |
2484 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
2485 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
e098433c JG |
2486 | int bitness, struct ust_registry_session *registry, |
2487 | uint64_t trace_archive_id) | |
7972aab2 DG |
2488 | { |
2489 | int ret; | |
2490 | unsigned int nb_fd = 0; | |
2491 | struct consumer_socket *socket; | |
2492 | ||
2493 | assert(usess); | |
2494 | assert(ua_sess); | |
2495 | assert(ua_chan); | |
2496 | assert(registry); | |
2497 | ||
2498 | rcu_read_lock(); | |
2499 | health_code_update(); | |
2500 | ||
2501 | /* Get the right consumer socket for the application. */ | |
2502 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
2503 | if (!socket) { | |
2504 | ret = -EINVAL; | |
2505 | goto error; | |
2506 | } | |
2507 | ||
2508 | health_code_update(); | |
2509 | ||
2510 | /* Need one fd for the channel. */ | |
2511 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2512 | if (ret < 0) { | |
2513 | ERR("Exhausted number of available FD upon create channel"); | |
2514 | goto error; | |
2515 | } | |
2516 | ||
2517 | /* | |
2518 | * Ask consumer to create channel. The consumer will return the number of | |
2519 | * stream we have to expect. | |
2520 | */ | |
2521 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
e098433c | 2522 | registry, trace_archive_id); |
7972aab2 DG |
2523 | if (ret < 0) { |
2524 | goto error_ask; | |
2525 | } | |
2526 | ||
2527 | /* | |
2528 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2529 | * stream (2 being the default value here). | |
2530 | */ | |
2531 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2532 | ||
2533 | /* Reserve the amount of file descriptor we need. */ | |
2534 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2535 | if (ret < 0) { | |
2536 | ERR("Exhausted number of available FD upon create channel"); | |
2537 | goto error_fd_get_stream; | |
2538 | } | |
2539 | ||
2540 | health_code_update(); | |
2541 | ||
2542 | /* | |
2543 | * Now get the channel from the consumer. This call wil populate the stream | |
2544 | * list of that channel and set the ust objects. | |
2545 | */ | |
d9078d0c DG |
2546 | if (usess->consumer->enabled) { |
2547 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2548 | if (ret < 0) { | |
2549 | goto error_destroy; | |
2550 | } | |
7972aab2 DG |
2551 | } |
2552 | ||
2553 | rcu_read_unlock(); | |
2554 | return 0; | |
2555 | ||
2556 | error_destroy: | |
2557 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2558 | error_fd_get_stream: | |
2559 | /* | |
2560 | * Initiate a destroy channel on the consumer since we had an error | |
2561 | * handling it on our side. The return value is of no importance since we | |
2562 | * already have a ret value set by the previous error that we need to | |
2563 | * return. | |
2564 | */ | |
2565 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2566 | error_ask: | |
2567 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2568 | error: | |
2569 | health_code_update(); | |
2570 | rcu_read_unlock(); | |
2571 | return ret; | |
2572 | } | |
2573 | ||
2574 | /* | |
2575 | * Duplicate the ust data object of the ust app stream and save it in the | |
2576 | * buffer registry stream. | |
2577 | * | |
2578 | * Return 0 on success or else a negative value. | |
2579 | */ | |
2580 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2581 | struct ust_app_stream *stream) | |
2582 | { | |
2583 | int ret; | |
2584 | ||
2585 | assert(reg_stream); | |
2586 | assert(stream); | |
2587 | ||
2588 | /* Reserve the amount of file descriptor we need. */ | |
2589 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2590 | if (ret < 0) { | |
2591 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2592 | goto error; | |
2593 | } | |
2594 | ||
2595 | /* Duplicate object for stream once the original is in the registry. */ | |
2596 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2597 | reg_stream->obj.ust); | |
2598 | if (ret < 0) { | |
2599 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2600 | reg_stream->obj.ust, stream->obj, ret); | |
2601 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2602 | goto error; | |
2603 | } | |
2604 | stream->handle = stream->obj->handle; | |
2605 | ||
2606 | error: | |
2607 | return ret; | |
2608 | } | |
2609 | ||
2610 | /* | |
2611 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2612 | * buffer registry channel. | |
2613 | * | |
2614 | * Return 0 on success or else a negative value. | |
2615 | */ | |
2616 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2617 | struct ust_app_channel *ua_chan) | |
2618 | { | |
2619 | int ret; | |
2620 | ||
2621 | assert(reg_chan); | |
2622 | assert(ua_chan); | |
2623 | ||
2624 | /* Need two fds for the channel. */ | |
2625 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2626 | if (ret < 0) { | |
2627 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2628 | goto error_fd_get; | |
2629 | } | |
2630 | ||
2631 | /* Duplicate object for stream once the original is in the registry. */ | |
2632 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2633 | if (ret < 0) { | |
2634 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2635 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2636 | goto error; | |
2637 | } | |
2638 | ua_chan->handle = ua_chan->obj->handle; | |
2639 | ||
2640 | return 0; | |
2641 | ||
2642 | error: | |
2643 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2644 | error_fd_get: | |
2645 | return ret; | |
2646 | } | |
2647 | ||
2648 | /* | |
2649 | * For a given channel buffer registry, setup all streams of the given ust | |
2650 | * application channel. | |
2651 | * | |
2652 | * Return 0 on success or else a negative value. | |
2653 | */ | |
2654 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
fb45065e MD |
2655 | struct ust_app_channel *ua_chan, |
2656 | struct ust_app *app) | |
7972aab2 DG |
2657 | { |
2658 | int ret = 0; | |
2659 | struct ust_app_stream *stream, *stmp; | |
2660 | ||
2661 | assert(reg_chan); | |
2662 | assert(ua_chan); | |
2663 | ||
2664 | DBG2("UST app setup buffer registry stream"); | |
2665 | ||
2666 | /* Send all streams to application. */ | |
2667 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2668 | struct buffer_reg_stream *reg_stream; | |
2669 | ||
2670 | ret = buffer_reg_stream_create(®_stream); | |
2671 | if (ret < 0) { | |
2672 | goto error; | |
2673 | } | |
2674 | ||
2675 | /* | |
2676 | * Keep original pointer and nullify it in the stream so the delete | |
2677 | * stream call does not release the object. | |
2678 | */ | |
2679 | reg_stream->obj.ust = stream->obj; | |
2680 | stream->obj = NULL; | |
2681 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2682 | |
7972aab2 DG |
2683 | /* We don't need the streams anymore. */ |
2684 | cds_list_del(&stream->list); | |
fb45065e | 2685 | delete_ust_app_stream(-1, stream, app); |
7972aab2 | 2686 | } |
421cb601 | 2687 | |
7972aab2 DG |
2688 | error: |
2689 | return ret; | |
2690 | } | |
2691 | ||
2692 | /* | |
2693 | * Create a buffer registry channel for the given session registry and | |
2694 | * application channel object. If regp pointer is valid, it's set with the | |
2695 | * created object. Important, the created object is NOT added to the session | |
2696 | * registry hash table. | |
2697 | * | |
2698 | * Return 0 on success else a negative value. | |
2699 | */ | |
2700 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2701 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2702 | { | |
2703 | int ret; | |
2704 | struct buffer_reg_channel *reg_chan = NULL; | |
2705 | ||
2706 | assert(reg_sess); | |
2707 | assert(ua_chan); | |
2708 | ||
2709 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2710 | ||
2711 | /* Create buffer registry channel. */ | |
2712 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2713 | if (ret < 0) { | |
2714 | goto error_create; | |
421cb601 | 2715 | } |
7972aab2 DG |
2716 | assert(reg_chan); |
2717 | reg_chan->consumer_key = ua_chan->key; | |
8c924c7b | 2718 | reg_chan->subbuf_size = ua_chan->attr.subbuf_size; |
d07ceecd | 2719 | reg_chan->num_subbuf = ua_chan->attr.num_subbuf; |
421cb601 | 2720 | |
7972aab2 DG |
2721 | /* Create and add a channel registry to session. */ |
2722 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2723 | ua_chan->tracing_channel_id); | |
2724 | if (ret < 0) { | |
2725 | goto error; | |
d88aee68 | 2726 | } |
7972aab2 | 2727 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2728 | |
7972aab2 DG |
2729 | if (regp) { |
2730 | *regp = reg_chan; | |
3d8ca23b | 2731 | } |
d88aee68 | 2732 | |
7972aab2 | 2733 | return 0; |
3d8ca23b DG |
2734 | |
2735 | error: | |
7972aab2 DG |
2736 | /* Safe because the registry channel object was not added to any HT. */ |
2737 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2738 | error_create: | |
3d8ca23b | 2739 | return ret; |
421cb601 DG |
2740 | } |
2741 | ||
55cc08a6 | 2742 | /* |
7972aab2 DG |
2743 | * Setup buffer registry channel for the given session registry and application |
2744 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2745 | * |
7972aab2 | 2746 | * Return 0 on success else a negative value. |
55cc08a6 | 2747 | */ |
7972aab2 | 2748 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
fb45065e MD |
2749 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan, |
2750 | struct ust_app *app) | |
55cc08a6 | 2751 | { |
7972aab2 | 2752 | int ret; |
55cc08a6 | 2753 | |
7972aab2 DG |
2754 | assert(reg_sess); |
2755 | assert(reg_chan); | |
2756 | assert(ua_chan); | |
2757 | assert(ua_chan->obj); | |
55cc08a6 | 2758 | |
7972aab2 | 2759 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2760 | |
7972aab2 | 2761 | /* Setup all streams for the registry. */ |
fb45065e | 2762 | ret = setup_buffer_reg_streams(reg_chan, ua_chan, app); |
7972aab2 | 2763 | if (ret < 0) { |
55cc08a6 DG |
2764 | goto error; |
2765 | } | |
2766 | ||
7972aab2 DG |
2767 | reg_chan->obj.ust = ua_chan->obj; |
2768 | ua_chan->obj = NULL; | |
55cc08a6 | 2769 | |
7972aab2 | 2770 | return 0; |
55cc08a6 DG |
2771 | |
2772 | error: | |
7972aab2 DG |
2773 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2774 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2775 | return ret; |
2776 | } | |
2777 | ||
edb67388 | 2778 | /* |
7972aab2 | 2779 | * Send buffer registry channel to the application. |
d0b96690 | 2780 | * |
7972aab2 | 2781 | * Return 0 on success else a negative value. |
edb67388 | 2782 | */ |
7972aab2 DG |
2783 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2784 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2785 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2786 | { |
2787 | int ret; | |
7972aab2 | 2788 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2789 | |
7972aab2 DG |
2790 | assert(reg_chan); |
2791 | assert(app); | |
2792 | assert(ua_sess); | |
2793 | assert(ua_chan); | |
2794 | ||
2795 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2796 | ||
2797 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2798 | if (ret < 0) { |
2799 | goto error; | |
2800 | } | |
2801 | ||
7972aab2 DG |
2802 | /* Send channel to the application. */ |
2803 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
2804 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
2805 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
2806 | goto error; | |
2807 | } else if (ret < 0) { | |
7972aab2 DG |
2808 | goto error; |
2809 | } | |
2810 | ||
2811 | health_code_update(); | |
2812 | ||
2813 | /* Send all streams to application. */ | |
2814 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2815 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2816 | struct ust_app_stream stream; | |
2817 | ||
2818 | ret = duplicate_stream_object(reg_stream, &stream); | |
2819 | if (ret < 0) { | |
2820 | goto error_stream_unlock; | |
2821 | } | |
2822 | ||
2823 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2824 | if (ret < 0) { | |
fb45065e | 2825 | (void) release_ust_app_stream(-1, &stream, app); |
a7169585 MD |
2826 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
2827 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
a7169585 | 2828 | } |
7972aab2 DG |
2829 | goto error_stream_unlock; |
2830 | } | |
edb67388 | 2831 | |
7972aab2 DG |
2832 | /* |
2833 | * The return value is not important here. This function will output an | |
2834 | * error if needed. | |
2835 | */ | |
fb45065e | 2836 | (void) release_ust_app_stream(-1, &stream, app); |
7972aab2 DG |
2837 | } |
2838 | ua_chan->is_sent = 1; | |
2839 | ||
2840 | error_stream_unlock: | |
2841 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2842 | error: |
2843 | return ret; | |
2844 | } | |
2845 | ||
9730260e | 2846 | /* |
7972aab2 DG |
2847 | * Create and send to the application the created buffers with per UID buffers. |
2848 | * | |
9acdc1d6 | 2849 | * This MUST be called with a RCU read side lock acquired. |
71e0a100 | 2850 | * The session list lock and the session's lock must be acquired. |
9acdc1d6 | 2851 | * |
7972aab2 | 2852 | * Return 0 on success else a negative value. |
9730260e | 2853 | */ |
7972aab2 DG |
2854 | static int create_channel_per_uid(struct ust_app *app, |
2855 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2856 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2857 | { |
2858 | int ret; | |
7972aab2 DG |
2859 | struct buffer_reg_uid *reg_uid; |
2860 | struct buffer_reg_channel *reg_chan; | |
e098433c JG |
2861 | struct ltt_session *session; |
2862 | enum lttng_error_code notification_ret; | |
2863 | struct ust_registry_channel *chan_reg; | |
9730260e | 2864 | |
7972aab2 DG |
2865 | assert(app); |
2866 | assert(usess); | |
2867 | assert(ua_sess); | |
2868 | assert(ua_chan); | |
2869 | ||
2870 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2871 | ||
2872 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2873 | /* | |
2874 | * The session creation handles the creation of this global registry | |
2875 | * object. If none can be find, there is a code flow problem or a | |
2876 | * teardown race. | |
2877 | */ | |
2878 | assert(reg_uid); | |
2879 | ||
2880 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2881 | reg_uid); | |
2721f7ea JG |
2882 | if (reg_chan) { |
2883 | goto send_channel; | |
2884 | } | |
7972aab2 | 2885 | |
2721f7ea JG |
2886 | /* Create the buffer registry channel object. */ |
2887 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2888 | if (ret < 0) { | |
2889 | ERR("Error creating the UST channel \"%s\" registry instance", | |
f14256d6 | 2890 | ua_chan->name); |
2721f7ea JG |
2891 | goto error; |
2892 | } | |
f14256d6 | 2893 | |
e098433c JG |
2894 | session = session_find_by_id(ua_sess->tracing_id); |
2895 | assert(session); | |
2896 | assert(pthread_mutex_trylock(&session->lock)); | |
2897 | assert(session_trylock_list()); | |
2898 | ||
2721f7ea JG |
2899 | /* |
2900 | * Create the buffers on the consumer side. This call populates the | |
2901 | * ust app channel object with all streams and data object. | |
2902 | */ | |
2903 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
e098433c JG |
2904 | app->bits_per_long, reg_uid->registry->reg.ust, |
2905 | session->current_archive_id); | |
2721f7ea JG |
2906 | if (ret < 0) { |
2907 | ERR("Error creating UST channel \"%s\" on the consumer daemon", | |
2908 | ua_chan->name); | |
7972aab2 DG |
2909 | |
2910 | /* | |
2721f7ea JG |
2911 | * Let's remove the previously created buffer registry channel so |
2912 | * it's not visible anymore in the session registry. | |
7972aab2 | 2913 | */ |
2721f7ea JG |
2914 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, |
2915 | ua_chan->tracing_channel_id, false); | |
2916 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
2917 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2918 | goto error; | |
7972aab2 DG |
2919 | } |
2920 | ||
2721f7ea JG |
2921 | /* |
2922 | * Setup the streams and add it to the session registry. | |
2923 | */ | |
2924 | ret = setup_buffer_reg_channel(reg_uid->registry, | |
2925 | ua_chan, reg_chan, app); | |
2926 | if (ret < 0) { | |
2927 | ERR("Error setting up UST channel \"%s\"", ua_chan->name); | |
2928 | goto error; | |
2929 | } | |
2930 | ||
e098433c JG |
2931 | /* Notify the notification subsystem of the channel's creation. */ |
2932 | pthread_mutex_lock(®_uid->registry->reg.ust->lock); | |
2933 | chan_reg = ust_registry_channel_find(reg_uid->registry->reg.ust, | |
2934 | ua_chan->tracing_channel_id); | |
2935 | assert(chan_reg); | |
2936 | chan_reg->consumer_key = ua_chan->key; | |
2937 | chan_reg = NULL; | |
2938 | pthread_mutex_unlock(®_uid->registry->reg.ust->lock); | |
e9404c27 | 2939 | |
e098433c JG |
2940 | notification_ret = notification_thread_command_add_channel( |
2941 | notification_thread_handle, session->name, | |
2942 | ua_sess->euid, ua_sess->egid, | |
2943 | ua_chan->name, | |
2944 | ua_chan->key, | |
2945 | LTTNG_DOMAIN_UST, | |
2946 | ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf); | |
2947 | if (notification_ret != LTTNG_OK) { | |
2948 | ret = - (int) notification_ret; | |
2949 | ERR("Failed to add channel to notification thread"); | |
2950 | goto error; | |
e9404c27 JG |
2951 | } |
2952 | ||
2721f7ea | 2953 | send_channel: |
66ff8e3f JG |
2954 | /* Send buffers to the application. */ |
2955 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
2956 | if (ret < 0) { | |
2957 | if (ret != -ENOTCONN) { | |
2958 | ERR("Error sending channel to application"); | |
2959 | } | |
2960 | goto error; | |
2961 | } | |
2962 | ||
9730260e DG |
2963 | error: |
2964 | return ret; | |
2965 | } | |
2966 | ||
78f0bacd | 2967 | /* |
7972aab2 DG |
2968 | * Create and send to the application the created buffers with per PID buffers. |
2969 | * | |
fad1ed2f | 2970 | * Called with UST app session lock held. |
71e0a100 | 2971 | * The session list lock and the session's lock must be acquired. |
fad1ed2f | 2972 | * |
7972aab2 | 2973 | * Return 0 on success else a negative value. |
78f0bacd | 2974 | */ |
7972aab2 DG |
2975 | static int create_channel_per_pid(struct ust_app *app, |
2976 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2977 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2978 | { |
8535a6d9 | 2979 | int ret; |
7972aab2 | 2980 | struct ust_registry_session *registry; |
e9404c27 JG |
2981 | enum lttng_error_code cmd_ret; |
2982 | struct ltt_session *session; | |
2983 | uint64_t chan_reg_key; | |
2984 | struct ust_registry_channel *chan_reg; | |
78f0bacd | 2985 | |
7972aab2 DG |
2986 | assert(app); |
2987 | assert(usess); | |
2988 | assert(ua_sess); | |
2989 | assert(ua_chan); | |
2990 | ||
2991 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2992 | ||
2993 | rcu_read_lock(); | |
2994 | ||
2995 | registry = get_session_registry(ua_sess); | |
fad1ed2f | 2996 | /* The UST app session lock is held, registry shall not be null. */ |
7972aab2 DG |
2997 | assert(registry); |
2998 | ||
2999 | /* Create and add a new channel registry to session. */ | |
3000 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd | 3001 | if (ret < 0) { |
f14256d6 MD |
3002 | ERR("Error creating the UST channel \"%s\" registry instance", |
3003 | ua_chan->name); | |
78f0bacd DG |
3004 | goto error; |
3005 | } | |
3006 | ||
e098433c JG |
3007 | session = session_find_by_id(ua_sess->tracing_id); |
3008 | assert(session); | |
3009 | ||
3010 | assert(pthread_mutex_trylock(&session->lock)); | |
3011 | assert(session_trylock_list()); | |
3012 | ||
7972aab2 DG |
3013 | /* Create and get channel on the consumer side. */ |
3014 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
e098433c JG |
3015 | app->bits_per_long, registry, |
3016 | session->current_archive_id); | |
7972aab2 | 3017 | if (ret < 0) { |
f14256d6 MD |
3018 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
3019 | ua_chan->name); | |
7972aab2 DG |
3020 | goto error; |
3021 | } | |
3022 | ||
3023 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
3024 | if (ret < 0) { | |
a7169585 MD |
3025 | if (ret != -ENOTCONN) { |
3026 | ERR("Error sending channel to application"); | |
3027 | } | |
7972aab2 DG |
3028 | goto error; |
3029 | } | |
8535a6d9 | 3030 | |
e9404c27 JG |
3031 | chan_reg_key = ua_chan->key; |
3032 | pthread_mutex_lock(®istry->lock); | |
3033 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
3034 | assert(chan_reg); | |
3035 | chan_reg->consumer_key = ua_chan->key; | |
3036 | pthread_mutex_unlock(®istry->lock); | |
3037 | ||
3038 | cmd_ret = notification_thread_command_add_channel( | |
3039 | notification_thread_handle, session->name, | |
3040 | ua_sess->euid, ua_sess->egid, | |
3041 | ua_chan->name, | |
3042 | ua_chan->key, | |
3043 | LTTNG_DOMAIN_UST, | |
3044 | ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf); | |
3045 | if (cmd_ret != LTTNG_OK) { | |
3046 | ret = - (int) cmd_ret; | |
3047 | ERR("Failed to add channel to notification thread"); | |
3048 | goto error; | |
3049 | } | |
3050 | ||
78f0bacd | 3051 | error: |
7972aab2 | 3052 | rcu_read_unlock(); |
78f0bacd DG |
3053 | return ret; |
3054 | } | |
3055 | ||
3056 | /* | |
7972aab2 DG |
3057 | * From an already allocated ust app channel, create the channel buffers if |
3058 | * need and send it to the application. This MUST be called with a RCU read | |
3059 | * side lock acquired. | |
3060 | * | |
fad1ed2f JR |
3061 | * Called with UST app session lock held. |
3062 | * | |
a7169585 MD |
3063 | * Return 0 on success or else a negative value. Returns -ENOTCONN if |
3064 | * the application exited concurrently. | |
78f0bacd | 3065 | */ |
7972aab2 DG |
3066 | static int do_create_channel(struct ust_app *app, |
3067 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
3068 | struct ust_app_channel *ua_chan) | |
78f0bacd | 3069 | { |
7972aab2 | 3070 | int ret; |
78f0bacd | 3071 | |
7972aab2 DG |
3072 | assert(app); |
3073 | assert(usess); | |
3074 | assert(ua_sess); | |
3075 | assert(ua_chan); | |
3076 | ||
3077 | /* Handle buffer type before sending the channel to the application. */ | |
3078 | switch (usess->buffer_type) { | |
3079 | case LTTNG_BUFFER_PER_UID: | |
3080 | { | |
3081 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
3082 | if (ret < 0) { | |
3083 | goto error; | |
3084 | } | |
3085 | break; | |
3086 | } | |
3087 | case LTTNG_BUFFER_PER_PID: | |
3088 | { | |
3089 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
3090 | if (ret < 0) { | |
3091 | goto error; | |
3092 | } | |
3093 | break; | |
3094 | } | |
3095 | default: | |
3096 | assert(0); | |
3097 | ret = -EINVAL; | |
78f0bacd DG |
3098 | goto error; |
3099 | } | |
3100 | ||
7972aab2 DG |
3101 | /* Initialize ust objd object using the received handle and add it. */ |
3102 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
3103 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 3104 | |
7972aab2 DG |
3105 | /* If channel is not enabled, disable it on the tracer */ |
3106 | if (!ua_chan->enabled) { | |
3107 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
3108 | if (ret < 0) { | |
3109 | goto error; | |
3110 | } | |
78f0bacd DG |
3111 | } |
3112 | ||
3113 | error: | |
3114 | return ret; | |
3115 | } | |
3116 | ||
284d8f55 | 3117 | /* |
4d710ac2 DG |
3118 | * Create UST app channel and create it on the tracer. Set ua_chanp of the |
3119 | * newly created channel if not NULL. | |
d0b96690 | 3120 | * |
36b588ed | 3121 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 | 3122 | * |
a7169585 MD |
3123 | * Return 0 on success or else a negative value. Returns -ENOTCONN if |
3124 | * the application exited concurrently. | |
284d8f55 | 3125 | */ |
4d710ac2 DG |
3126 | static int create_ust_app_channel(struct ust_app_session *ua_sess, |
3127 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
7972aab2 | 3128 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 3129 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
3130 | { |
3131 | int ret = 0; | |
bec39940 DG |
3132 | struct lttng_ht_iter iter; |
3133 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
3134 | struct ust_app_channel *ua_chan; |
3135 | ||
3136 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3137 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
3138 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 3139 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 3140 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 3141 | goto end; |
5b4a0ec0 DG |
3142 | } |
3143 | ||
d0b96690 | 3144 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
3145 | if (ua_chan == NULL) { |
3146 | /* Only malloc can fail here */ | |
4d710ac2 | 3147 | ret = -ENOMEM; |
094d1690 | 3148 | goto error_alloc; |
fc34caaa DG |
3149 | } |
3150 | shadow_copy_channel(ua_chan, uchan); | |
3151 | ||
ffe60014 DG |
3152 | /* Set channel type. */ |
3153 | ua_chan->attr.type = type; | |
3154 | ||
7972aab2 | 3155 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
5b4a0ec0 DG |
3156 | if (ret < 0) { |
3157 | goto error; | |
3158 | } | |
3159 | ||
fc34caaa | 3160 | DBG2("UST app create channel %s for PID %d completed", ua_chan->name, |
852d0037 | 3161 | app->pid); |
fc34caaa | 3162 | |
d0b96690 DG |
3163 | /* Only add the channel if successful on the tracer side. */ |
3164 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
fc34caaa | 3165 | end: |
4d710ac2 DG |
3166 | if (ua_chanp) { |
3167 | *ua_chanp = ua_chan; | |
3168 | } | |
3169 | ||
3170 | /* Everything went well. */ | |
3171 | return 0; | |
5b4a0ec0 DG |
3172 | |
3173 | error: | |
d0b96690 | 3174 | delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app); |
094d1690 | 3175 | error_alloc: |
4d710ac2 | 3176 | return ret; |
5b4a0ec0 DG |
3177 | } |
3178 | ||
3179 | /* | |
3180 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
3181 | * |
3182 | * Called with ust app session mutex held. | |
5b4a0ec0 | 3183 | */ |
edb67388 DG |
3184 | static |
3185 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
3186 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
3187 | struct ust_app *app) | |
284d8f55 | 3188 | { |
edb67388 | 3189 | int ret = 0; |
5b4a0ec0 | 3190 | struct ust_app_event *ua_event; |
284d8f55 | 3191 | |
5b4a0ec0 | 3192 | /* Get event node */ |
18eace3b | 3193 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 3194 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 3195 | if (ua_event != NULL) { |
fc34caaa | 3196 | ret = -EEXIST; |
edb67388 DG |
3197 | goto end; |
3198 | } | |
5b4a0ec0 | 3199 | |
edb67388 DG |
3200 | /* Does not exist so create one */ |
3201 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); | |
3202 | if (ua_event == NULL) { | |
3203 | /* Only malloc can failed so something is really wrong */ | |
3204 | ret = -ENOMEM; | |
fc34caaa | 3205 | goto end; |
5b4a0ec0 | 3206 | } |
edb67388 | 3207 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 3208 | |
edb67388 | 3209 | /* Create it on the tracer side */ |
5b4a0ec0 | 3210 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 3211 | if (ret < 0) { |
fc34caaa | 3212 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 3213 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
3214 | goto error; |
3215 | } | |
3216 | ||
d0b96690 | 3217 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 3218 | |
fc34caaa | 3219 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 3220 | app->pid); |
7f79d3a1 | 3221 | |
edb67388 | 3222 | end: |
fc34caaa DG |
3223 | return ret; |
3224 | ||
5b4a0ec0 | 3225 | error: |
fc34caaa | 3226 | /* Valid. Calling here is already in a read side lock */ |
fb45065e | 3227 | delete_ust_app_event(-1, ua_event, app); |
edb67388 | 3228 | return ret; |
5b4a0ec0 DG |
3229 | } |
3230 | ||
3231 | /* | |
3232 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 3233 | * |
7972aab2 | 3234 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
3235 | */ |
3236 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
ad7a9107 | 3237 | struct ust_app *app, struct consumer_output *consumer) |
5b4a0ec0 DG |
3238 | { |
3239 | int ret = 0; | |
ffe60014 | 3240 | struct ust_app_channel *metadata; |
d88aee68 | 3241 | struct consumer_socket *socket; |
7972aab2 | 3242 | struct ust_registry_session *registry; |
e098433c | 3243 | struct ltt_session *session; |
5b4a0ec0 | 3244 | |
ffe60014 DG |
3245 | assert(ua_sess); |
3246 | assert(app); | |
d88aee68 | 3247 | assert(consumer); |
5b4a0ec0 | 3248 | |
7972aab2 | 3249 | registry = get_session_registry(ua_sess); |
fad1ed2f | 3250 | /* The UST app session is held registry shall not be null. */ |
7972aab2 DG |
3251 | assert(registry); |
3252 | ||
ce34fcd0 MD |
3253 | pthread_mutex_lock(®istry->lock); |
3254 | ||
1b532a60 DG |
3255 | /* Metadata already exists for this registry or it was closed previously */ |
3256 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
3257 | ret = 0; |
3258 | goto error; | |
5b4a0ec0 DG |
3259 | } |
3260 | ||
ffe60014 | 3261 | /* Allocate UST metadata */ |
d0b96690 | 3262 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
3263 | if (!metadata) { |
3264 | /* malloc() failed */ | |
3265 | ret = -ENOMEM; | |
3266 | goto error; | |
3267 | } | |
5b4a0ec0 | 3268 | |
ad7a9107 | 3269 | memcpy(&metadata->attr, &ua_sess->metadata_attr, sizeof(metadata->attr)); |
5b4a0ec0 | 3270 | |
7972aab2 DG |
3271 | /* Need one fd for the channel. */ |
3272 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
3273 | if (ret < 0) { | |
3274 | ERR("Exhausted number of available FD upon create metadata"); | |
3275 | goto error; | |
3276 | } | |
3277 | ||
4dc3dfc5 DG |
3278 | /* Get the right consumer socket for the application. */ |
3279 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
3280 | if (!socket) { | |
3281 | ret = -EINVAL; | |
3282 | goto error_consumer; | |
3283 | } | |
3284 | ||
331744e3 JD |
3285 | /* |
3286 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
3287 | * to the registry *before* we ask the consumer so we avoid the race of the | |
3288 | * consumer requesting the metadata and the ask_channel call on our side | |
3289 | * did not returned yet. | |
3290 | */ | |
3291 | registry->metadata_key = metadata->key; | |
3292 | ||
e098433c JG |
3293 | session = session_find_by_id(ua_sess->tracing_id); |
3294 | assert(session); | |
3295 | ||
3296 | assert(pthread_mutex_trylock(&session->lock)); | |
3297 | assert(session_trylock_list()); | |
3298 | ||
d88aee68 DG |
3299 | /* |
3300 | * Ask the metadata channel creation to the consumer. The metadata object | |
3301 | * will be created by the consumer and kept their. However, the stream is | |
3302 | * never added or monitored until we do a first push metadata to the | |
3303 | * consumer. | |
3304 | */ | |
7972aab2 | 3305 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
e098433c | 3306 | registry, session->current_archive_id); |
d88aee68 | 3307 | if (ret < 0) { |
f2a444f1 DG |
3308 | /* Nullify the metadata key so we don't try to close it later on. */ |
3309 | registry->metadata_key = 0; | |
d88aee68 DG |
3310 | goto error_consumer; |
3311 | } | |
3312 | ||
3313 | /* | |
3314 | * The setup command will make the metadata stream be sent to the relayd, | |
3315 | * if applicable, and the thread managing the metadatas. This is important | |
3316 | * because after this point, if an error occurs, the only way the stream | |
3317 | * can be deleted is to be monitored in the consumer. | |
3318 | */ | |
7972aab2 | 3319 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 3320 | if (ret < 0) { |
f2a444f1 DG |
3321 | /* Nullify the metadata key so we don't try to close it later on. */ |
3322 | registry->metadata_key = 0; | |
d88aee68 | 3323 | goto error_consumer; |
5b4a0ec0 DG |
3324 | } |
3325 | ||
7972aab2 DG |
3326 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
3327 | metadata->key, app->pid); | |
5b4a0ec0 | 3328 | |
d88aee68 | 3329 | error_consumer: |
b80f0b6c | 3330 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 3331 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 3332 | error: |
ce34fcd0 | 3333 | pthread_mutex_unlock(®istry->lock); |
ffe60014 | 3334 | return ret; |
5b4a0ec0 DG |
3335 | } |
3336 | ||
5b4a0ec0 | 3337 | /* |
d88aee68 DG |
3338 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
3339 | * acquired before calling this function. | |
5b4a0ec0 DG |
3340 | */ |
3341 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
3342 | { | |
d88aee68 | 3343 | struct ust_app *app = NULL; |
bec39940 DG |
3344 | struct lttng_ht_node_ulong *node; |
3345 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 3346 | |
bec39940 DG |
3347 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
3348 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
3349 | if (node == NULL) { |
3350 | DBG2("UST app no found with pid %d", pid); | |
3351 | goto error; | |
3352 | } | |
5b4a0ec0 DG |
3353 | |
3354 | DBG2("Found UST app by pid %d", pid); | |
3355 | ||
d88aee68 | 3356 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
3357 | |
3358 | error: | |
d88aee68 | 3359 | return app; |
5b4a0ec0 DG |
3360 | } |
3361 | ||
d88aee68 DG |
3362 | /* |
3363 | * Allocate and init an UST app object using the registration information and | |
3364 | * the command socket. This is called when the command socket connects to the | |
3365 | * session daemon. | |
3366 | * | |
3367 | * The object is returned on success or else NULL. | |
3368 | */ | |
d0b96690 | 3369 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 3370 | { |
d0b96690 DG |
3371 | struct ust_app *lta = NULL; |
3372 | ||
3373 | assert(msg); | |
3374 | assert(sock >= 0); | |
3375 | ||
3376 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 3377 | |
173af62f DG |
3378 | if ((msg->bits_per_long == 64 && |
3379 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
3380 | || (msg->bits_per_long == 32 && | |
3381 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 3382 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
3383 | "%d-bit long, but no consumerd for this size is available.\n", |
3384 | msg->name, msg->pid, msg->bits_per_long); | |
3385 | goto error; | |
3f2c5fcc | 3386 | } |
d0b96690 | 3387 | |
5b4a0ec0 DG |
3388 | lta = zmalloc(sizeof(struct ust_app)); |
3389 | if (lta == NULL) { | |
3390 | PERROR("malloc"); | |
d0b96690 | 3391 | goto error; |
5b4a0ec0 DG |
3392 | } |
3393 | ||
3394 | lta->ppid = msg->ppid; | |
3395 | lta->uid = msg->uid; | |
3396 | lta->gid = msg->gid; | |
d0b96690 | 3397 | |
7753dea8 | 3398 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
3399 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
3400 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
3401 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
3402 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
3403 | lta->long_alignment = msg->long_alignment; | |
3404 | lta->byte_order = msg->byte_order; | |
3405 | ||
5b4a0ec0 DG |
3406 | lta->v_major = msg->major; |
3407 | lta->v_minor = msg->minor; | |
d9bf3ca4 | 3408 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 | 3409 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
10b56aef | 3410 | lta->ust_sessions_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3411 | lta->notify_sock = -1; |
d88aee68 DG |
3412 | |
3413 | /* Copy name and make sure it's NULL terminated. */ | |
3414 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
3415 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
3416 | ||
3417 | /* | |
3418 | * Before this can be called, when receiving the registration information, | |
3419 | * the application compatibility is checked. So, at this point, the | |
3420 | * application can work with this session daemon. | |
3421 | */ | |
d0b96690 | 3422 | lta->compatible = 1; |
5b4a0ec0 | 3423 | |
852d0037 | 3424 | lta->pid = msg->pid; |
d0b96690 | 3425 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 3426 | lta->sock = sock; |
fb45065e | 3427 | pthread_mutex_init(<a->sock_lock, NULL); |
d0b96690 | 3428 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 3429 | |
d42f20df | 3430 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
d0b96690 DG |
3431 | error: |
3432 | return lta; | |
3433 | } | |
3434 | ||
d88aee68 DG |
3435 | /* |
3436 | * For a given application object, add it to every hash table. | |
3437 | */ | |
d0b96690 DG |
3438 | void ust_app_add(struct ust_app *app) |
3439 | { | |
3440 | assert(app); | |
3441 | assert(app->notify_sock >= 0); | |
3442 | ||
5b4a0ec0 | 3443 | rcu_read_lock(); |
852d0037 DG |
3444 | |
3445 | /* | |
3446 | * On a re-registration, we want to kick out the previous registration of | |
3447 | * that pid | |
3448 | */ | |
d0b96690 | 3449 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
3450 | |
3451 | /* | |
3452 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
3453 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
3454 | * already in the table. | |
3455 | */ | |
d0b96690 | 3456 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 3457 | |
d0b96690 DG |
3458 | /* Add application to the notify socket hash table. */ |
3459 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
3460 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 3461 | |
d0b96690 | 3462 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
3463 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
3464 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
3465 | app->v_minor); | |
5b4a0ec0 | 3466 | |
d0b96690 DG |
3467 | rcu_read_unlock(); |
3468 | } | |
3469 | ||
d88aee68 DG |
3470 | /* |
3471 | * Set the application version into the object. | |
3472 | * | |
3473 | * Return 0 on success else a negative value either an errno code or a | |
3474 | * LTTng-UST error code. | |
3475 | */ | |
d0b96690 DG |
3476 | int ust_app_version(struct ust_app *app) |
3477 | { | |
d88aee68 DG |
3478 | int ret; |
3479 | ||
d0b96690 | 3480 | assert(app); |
d88aee68 | 3481 | |
fb45065e | 3482 | pthread_mutex_lock(&app->sock_lock); |
d88aee68 | 3483 | ret = ustctl_tracer_version(app->sock, &app->version); |
fb45065e | 3484 | pthread_mutex_unlock(&app->sock_lock); |
d88aee68 DG |
3485 | if (ret < 0) { |
3486 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
5368d366 | 3487 | ERR("UST app %d version failed with ret %d", app->sock, ret); |
d88aee68 | 3488 | } else { |
5368d366 | 3489 | DBG3("UST app %d version failed. Application is dead", app->sock); |
d88aee68 DG |
3490 | } |
3491 | } | |
3492 | ||
3493 | return ret; | |
5b4a0ec0 DG |
3494 | } |
3495 | ||
3496 | /* | |
3497 | * Unregister app by removing it from the global traceable app list and freeing | |
3498 | * the data struct. | |
3499 | * | |
3500 | * The socket is already closed at this point so no close to sock. | |
3501 | */ | |
3502 | void ust_app_unregister(int sock) | |
3503 | { | |
3504 | struct ust_app *lta; | |
bec39940 | 3505 | struct lttng_ht_node_ulong *node; |
c4b88406 | 3506 | struct lttng_ht_iter ust_app_sock_iter; |
bec39940 | 3507 | struct lttng_ht_iter iter; |
d42f20df | 3508 | struct ust_app_session *ua_sess; |
525b0740 | 3509 | int ret; |
5b4a0ec0 DG |
3510 | |
3511 | rcu_read_lock(); | |
886459c6 | 3512 | |
5b4a0ec0 | 3513 | /* Get the node reference for a call_rcu */ |
c4b88406 MD |
3514 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &ust_app_sock_iter); |
3515 | node = lttng_ht_iter_get_node_ulong(&ust_app_sock_iter); | |
d0b96690 | 3516 | assert(node); |
284d8f55 | 3517 | |
852d0037 | 3518 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
3519 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
3520 | ||
d88aee68 | 3521 | /* |
ce34fcd0 MD |
3522 | * For per-PID buffers, perform "push metadata" and flush all |
3523 | * application streams before removing app from hash tables, | |
3524 | * ensuring proper behavior of data_pending check. | |
c4b88406 | 3525 | * Remove sessions so they are not visible during deletion. |
d88aee68 | 3526 | */ |
d42f20df DG |
3527 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, |
3528 | node.node) { | |
7972aab2 DG |
3529 | struct ust_registry_session *registry; |
3530 | ||
d42f20df DG |
3531 | ret = lttng_ht_del(lta->sessions, &iter); |
3532 | if (ret) { | |
3533 | /* The session was already removed so scheduled for teardown. */ | |
3534 | continue; | |
3535 | } | |
3536 | ||
ce34fcd0 MD |
3537 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { |
3538 | (void) ust_app_flush_app_session(lta, ua_sess); | |
3539 | } | |
c4b88406 | 3540 | |
d42f20df DG |
3541 | /* |
3542 | * Add session to list for teardown. This is safe since at this point we | |
3543 | * are the only one using this list. | |
3544 | */ | |
d88aee68 DG |
3545 | pthread_mutex_lock(&ua_sess->lock); |
3546 | ||
b161602a MD |
3547 | if (ua_sess->deleted) { |
3548 | pthread_mutex_unlock(&ua_sess->lock); | |
3549 | continue; | |
3550 | } | |
3551 | ||
d88aee68 DG |
3552 | /* |
3553 | * Normally, this is done in the delete session process which is | |
3554 | * executed in the call rcu below. However, upon registration we can't | |
3555 | * afford to wait for the grace period before pushing data or else the | |
3556 | * data pending feature can race between the unregistration and stop | |
3557 | * command where the data pending command is sent *before* the grace | |
3558 | * period ended. | |
3559 | * | |
3560 | * The close metadata below nullifies the metadata pointer in the | |
3561 | * session so the delete session will NOT push/close a second time. | |
3562 | */ | |
7972aab2 | 3563 | registry = get_session_registry(ua_sess); |
ce34fcd0 | 3564 | if (registry) { |
7972aab2 DG |
3565 | /* Push metadata for application before freeing the application. */ |
3566 | (void) push_metadata(registry, ua_sess->consumer); | |
3567 | ||
3568 | /* | |
3569 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
3570 | * metadata only on destroy trace session in this case. Also, the |
3571 | * previous push metadata could have flag the metadata registry to | |
3572 | * close so don't send a close command if closed. | |
7972aab2 | 3573 | */ |
ce34fcd0 | 3574 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
3575 | /* And ask to close it for this session registry. */ |
3576 | (void) close_metadata(registry, ua_sess->consumer); | |
3577 | } | |
3578 | } | |
d42f20df | 3579 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
c4b88406 | 3580 | |
d88aee68 | 3581 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
3582 | } |
3583 | ||
c4b88406 MD |
3584 | /* Remove application from PID hash table */ |
3585 | ret = lttng_ht_del(ust_app_ht_by_sock, &ust_app_sock_iter); | |
3586 | assert(!ret); | |
3587 | ||
3588 | /* | |
3589 | * Remove application from notify hash table. The thread handling the | |
3590 | * notify socket could have deleted the node so ignore on error because | |
c48239ca JG |
3591 | * either way it's valid. The close of that socket is handled by the |
3592 | * apps_notify_thread. | |
c4b88406 MD |
3593 | */ |
3594 | iter.iter.node = <a->notify_sock_n.node; | |
3595 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3596 | ||
3597 | /* | |
3598 | * Ignore return value since the node might have been removed before by an | |
3599 | * add replace during app registration because the PID can be reassigned by | |
3600 | * the OS. | |
3601 | */ | |
3602 | iter.iter.node = <a->pid_n.node; | |
3603 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3604 | if (ret) { | |
3605 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
3606 | lta->pid); | |
3607 | } | |
3608 | ||
852d0037 DG |
3609 | /* Free memory */ |
3610 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
3611 | ||
5b4a0ec0 DG |
3612 | rcu_read_unlock(); |
3613 | return; | |
284d8f55 DG |
3614 | } |
3615 | ||
5b4a0ec0 DG |
3616 | /* |
3617 | * Fill events array with all events name of all registered apps. | |
3618 | */ | |
3619 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 3620 | { |
5b4a0ec0 DG |
3621 | int ret, handle; |
3622 | size_t nbmem, count = 0; | |
bec39940 | 3623 | struct lttng_ht_iter iter; |
5b4a0ec0 | 3624 | struct ust_app *app; |
c617c0c6 | 3625 | struct lttng_event *tmp_event; |
421cb601 | 3626 | |
5b4a0ec0 | 3627 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
3628 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
3629 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
3630 | PERROR("zmalloc ust app events"); |
3631 | ret = -ENOMEM; | |
421cb601 DG |
3632 | goto error; |
3633 | } | |
3634 | ||
5b4a0ec0 | 3635 | rcu_read_lock(); |
421cb601 | 3636 | |
852d0037 | 3637 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 3638 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 3639 | |
840cb59c | 3640 | health_code_update(); |
86acf0da | 3641 | |
e0c7ec2b DG |
3642 | if (!app->compatible) { |
3643 | /* | |
3644 | * TODO: In time, we should notice the caller of this error by | |
3645 | * telling him that this is a version error. | |
3646 | */ | |
3647 | continue; | |
3648 | } | |
fb45065e | 3649 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 3650 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 3651 | if (handle < 0) { |
ffe60014 DG |
3652 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3653 | ERR("UST app list events getting handle failed for app pid %d", | |
3654 | app->pid); | |
3655 | } | |
fb45065e | 3656 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 DG |
3657 | continue; |
3658 | } | |
421cb601 | 3659 | |
852d0037 | 3660 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 3661 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3662 | /* Handle ustctl error. */ |
3663 | if (ret < 0) { | |
fb45065e MD |
3664 | int release_ret; |
3665 | ||
a2ba1ab0 | 3666 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3667 | ERR("UST app tp list get failed for app %d with ret %d", |
3668 | app->sock, ret); | |
3669 | } else { | |
3670 | DBG3("UST app tp list get failed. Application is dead"); | |
3757b385 DG |
3671 | /* |
3672 | * This is normal behavior, an application can die during the | |
3673 | * creation process. Don't report an error so the execution can | |
3674 | * continue normally. Continue normal execution. | |
3675 | */ | |
3676 | break; | |
ffe60014 | 3677 | } |
98f595d4 | 3678 | free(tmp_event); |
fb45065e | 3679 | release_ret = ustctl_release_handle(app->sock, handle); |
68313703 JG |
3680 | if (release_ret < 0 && |
3681 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3682 | release_ret != -EPIPE) { | |
fb45065e MD |
3683 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3684 | } | |
3685 | pthread_mutex_unlock(&app->sock_lock); | |
ffe60014 DG |
3686 | goto rcu_error; |
3687 | } | |
3688 | ||
840cb59c | 3689 | health_code_update(); |
815564d8 | 3690 | if (count >= nbmem) { |
d7b3776f | 3691 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3692 | struct lttng_event *new_tmp_event; |
3693 | size_t new_nbmem; | |
3694 | ||
3695 | new_nbmem = nbmem << 1; | |
3696 | DBG2("Reallocating event list from %zu to %zu entries", | |
3697 | nbmem, new_nbmem); | |
3698 | new_tmp_event = realloc(tmp_event, | |
3699 | new_nbmem * sizeof(struct lttng_event)); | |
3700 | if (new_tmp_event == NULL) { | |
fb45065e MD |
3701 | int release_ret; |
3702 | ||
5b4a0ec0 | 3703 | PERROR("realloc ust app events"); |
c617c0c6 | 3704 | free(tmp_event); |
5b4a0ec0 | 3705 | ret = -ENOMEM; |
fb45065e | 3706 | release_ret = ustctl_release_handle(app->sock, handle); |
68313703 JG |
3707 | if (release_ret < 0 && |
3708 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3709 | release_ret != -EPIPE) { | |
fb45065e MD |
3710 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3711 | } | |
3712 | pthread_mutex_unlock(&app->sock_lock); | |
5b4a0ec0 DG |
3713 | goto rcu_error; |
3714 | } | |
53efb85a MD |
3715 | /* Zero the new memory */ |
3716 | memset(new_tmp_event + nbmem, 0, | |
3717 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
3718 | nbmem = new_nbmem; | |
3719 | tmp_event = new_tmp_event; | |
5b4a0ec0 | 3720 | } |
c617c0c6 MD |
3721 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
3722 | tmp_event[count].loglevel = uiter.loglevel; | |
3723 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
3724 | tmp_event[count].pid = app->pid; | |
3725 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 3726 | count++; |
421cb601 | 3727 | } |
fb45065e MD |
3728 | ret = ustctl_release_handle(app->sock, handle); |
3729 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 | 3730 | if (ret < 0 && ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
fb45065e MD |
3731 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
3732 | } | |
421cb601 DG |
3733 | } |
3734 | ||
5b4a0ec0 | 3735 | ret = count; |
c617c0c6 | 3736 | *events = tmp_event; |
421cb601 | 3737 | |
5b4a0ec0 | 3738 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 3739 | |
5b4a0ec0 DG |
3740 | rcu_error: |
3741 | rcu_read_unlock(); | |
421cb601 | 3742 | error: |
840cb59c | 3743 | health_code_update(); |
5b4a0ec0 | 3744 | return ret; |
421cb601 DG |
3745 | } |
3746 | ||
f37d259d MD |
3747 | /* |
3748 | * Fill events array with all events name of all registered apps. | |
3749 | */ | |
3750 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
3751 | { | |
3752 | int ret, handle; | |
3753 | size_t nbmem, count = 0; | |
3754 | struct lttng_ht_iter iter; | |
3755 | struct ust_app *app; | |
c617c0c6 | 3756 | struct lttng_event_field *tmp_event; |
f37d259d MD |
3757 | |
3758 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
3759 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
3760 | if (tmp_event == NULL) { | |
f37d259d MD |
3761 | PERROR("zmalloc ust app event fields"); |
3762 | ret = -ENOMEM; | |
3763 | goto error; | |
3764 | } | |
3765 | ||
3766 | rcu_read_lock(); | |
3767 | ||
3768 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3769 | struct lttng_ust_field_iter uiter; | |
3770 | ||
840cb59c | 3771 | health_code_update(); |
86acf0da | 3772 | |
f37d259d MD |
3773 | if (!app->compatible) { |
3774 | /* | |
3775 | * TODO: In time, we should notice the caller of this error by | |
3776 | * telling him that this is a version error. | |
3777 | */ | |
3778 | continue; | |
3779 | } | |
fb45065e | 3780 | pthread_mutex_lock(&app->sock_lock); |
f37d259d MD |
3781 | handle = ustctl_tracepoint_field_list(app->sock); |
3782 | if (handle < 0) { | |
ffe60014 DG |
3783 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3784 | ERR("UST app list field getting handle failed for app pid %d", | |
3785 | app->pid); | |
3786 | } | |
fb45065e | 3787 | pthread_mutex_unlock(&app->sock_lock); |
f37d259d MD |
3788 | continue; |
3789 | } | |
3790 | ||
3791 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 3792 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3793 | /* Handle ustctl error. */ |
3794 | if (ret < 0) { | |
fb45065e MD |
3795 | int release_ret; |
3796 | ||
a2ba1ab0 | 3797 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3798 | ERR("UST app tp list field failed for app %d with ret %d", |
3799 | app->sock, ret); | |
3800 | } else { | |
3801 | DBG3("UST app tp list field failed. Application is dead"); | |
3757b385 DG |
3802 | /* |
3803 | * This is normal behavior, an application can die during the | |
3804 | * creation process. Don't report an error so the execution can | |
98f595d4 | 3805 | * continue normally. Reset list and count for next app. |
3757b385 DG |
3806 | */ |
3807 | break; | |
ffe60014 | 3808 | } |
98f595d4 | 3809 | free(tmp_event); |
fb45065e MD |
3810 | release_ret = ustctl_release_handle(app->sock, handle); |
3811 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
3812 | if (release_ret < 0 && |
3813 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3814 | release_ret != -EPIPE) { | |
fb45065e MD |
3815 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3816 | } | |
ffe60014 DG |
3817 | goto rcu_error; |
3818 | } | |
3819 | ||
840cb59c | 3820 | health_code_update(); |
f37d259d | 3821 | if (count >= nbmem) { |
d7b3776f | 3822 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3823 | struct lttng_event_field *new_tmp_event; |
3824 | size_t new_nbmem; | |
3825 | ||
3826 | new_nbmem = nbmem << 1; | |
3827 | DBG2("Reallocating event field list from %zu to %zu entries", | |
3828 | nbmem, new_nbmem); | |
3829 | new_tmp_event = realloc(tmp_event, | |
3830 | new_nbmem * sizeof(struct lttng_event_field)); | |
3831 | if (new_tmp_event == NULL) { | |
fb45065e MD |
3832 | int release_ret; |
3833 | ||
f37d259d | 3834 | PERROR("realloc ust app event fields"); |
c617c0c6 | 3835 | free(tmp_event); |
f37d259d | 3836 | ret = -ENOMEM; |
fb45065e MD |
3837 | release_ret = ustctl_release_handle(app->sock, handle); |
3838 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
3839 | if (release_ret && |
3840 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3841 | release_ret != -EPIPE) { | |
fb45065e MD |
3842 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3843 | } | |
f37d259d MD |
3844 | goto rcu_error; |
3845 | } | |
53efb85a MD |
3846 | /* Zero the new memory */ |
3847 | memset(new_tmp_event + nbmem, 0, | |
3848 | (new_nbmem - nbmem) * sizeof(struct lttng_event_field)); | |
3849 | nbmem = new_nbmem; | |
3850 | tmp_event = new_tmp_event; | |
f37d259d | 3851 | } |
f37d259d | 3852 | |
c617c0c6 | 3853 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
2e84128e DG |
3854 | /* Mapping between these enums matches 1 to 1. */ |
3855 | tmp_event[count].type = (enum lttng_event_field_type) uiter.type; | |
c617c0c6 | 3856 | tmp_event[count].nowrite = uiter.nowrite; |
f37d259d | 3857 | |
c617c0c6 MD |
3858 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
3859 | tmp_event[count].event.loglevel = uiter.loglevel; | |
2e84128e | 3860 | tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; |
c617c0c6 MD |
3861 | tmp_event[count].event.pid = app->pid; |
3862 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
3863 | count++; |
3864 | } | |
fb45065e MD |
3865 | ret = ustctl_release_handle(app->sock, handle); |
3866 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
3867 | if (ret < 0 && |
3868 | ret != -LTTNG_UST_ERR_EXITING && | |
3869 | ret != -EPIPE) { | |
fb45065e MD |
3870 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
3871 | } | |
f37d259d MD |
3872 | } |
3873 | ||
3874 | ret = count; | |
c617c0c6 | 3875 | *fields = tmp_event; |
f37d259d MD |
3876 | |
3877 | DBG2("UST app list event fields done (%zu events)", count); | |
3878 | ||
3879 | rcu_error: | |
3880 | rcu_read_unlock(); | |
3881 | error: | |
840cb59c | 3882 | health_code_update(); |
f37d259d MD |
3883 | return ret; |
3884 | } | |
3885 | ||
5b4a0ec0 DG |
3886 | /* |
3887 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
3888 | * |
3889 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
3890 | */ |
3891 | void ust_app_clean_list(void) | |
421cb601 | 3892 | { |
5b4a0ec0 | 3893 | int ret; |
659ed79f | 3894 | struct ust_app *app; |
bec39940 | 3895 | struct lttng_ht_iter iter; |
421cb601 | 3896 | |
5b4a0ec0 | 3897 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3898 | |
5b4a0ec0 | 3899 | rcu_read_lock(); |
421cb601 | 3900 | |
f1b711c4 MD |
3901 | if (ust_app_ht) { |
3902 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3903 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3904 | assert(!ret); | |
3905 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
3906 | } | |
421cb601 DG |
3907 | } |
3908 | ||
852d0037 | 3909 | /* Cleanup socket hash table */ |
f1b711c4 MD |
3910 | if (ust_app_ht_by_sock) { |
3911 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, | |
3912 | sock_n.node) { | |
3913 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); | |
3914 | assert(!ret); | |
3915 | } | |
bec39940 | 3916 | } |
852d0037 | 3917 | |
d88aee68 | 3918 | /* Cleanup notify socket hash table */ |
f1b711c4 MD |
3919 | if (ust_app_ht_by_notify_sock) { |
3920 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3921 | notify_sock_n.node) { | |
3922 | ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3923 | assert(!ret); | |
3924 | } | |
d88aee68 | 3925 | } |
36b588ed | 3926 | rcu_read_unlock(); |
d88aee68 | 3927 | |
bec39940 | 3928 | /* Destroy is done only when the ht is empty */ |
f1b711c4 MD |
3929 | if (ust_app_ht) { |
3930 | ht_cleanup_push(ust_app_ht); | |
3931 | } | |
3932 | if (ust_app_ht_by_sock) { | |
3933 | ht_cleanup_push(ust_app_ht_by_sock); | |
3934 | } | |
3935 | if (ust_app_ht_by_notify_sock) { | |
3936 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
3937 | } | |
5b4a0ec0 DG |
3938 | } |
3939 | ||
3940 | /* | |
3941 | * Init UST app hash table. | |
3942 | */ | |
57703f6e | 3943 | int ust_app_ht_alloc(void) |
5b4a0ec0 | 3944 | { |
bec39940 | 3945 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3946 | if (!ust_app_ht) { |
3947 | return -1; | |
3948 | } | |
852d0037 | 3949 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3950 | if (!ust_app_ht_by_sock) { |
3951 | return -1; | |
3952 | } | |
d0b96690 | 3953 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3954 | if (!ust_app_ht_by_notify_sock) { |
3955 | return -1; | |
3956 | } | |
3957 | return 0; | |
421cb601 DG |
3958 | } |
3959 | ||
78f0bacd DG |
3960 | /* |
3961 | * For a specific UST session, disable the channel for all registered apps. | |
3962 | */ | |
35a9059d | 3963 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3964 | struct ltt_ust_channel *uchan) |
3965 | { | |
3966 | int ret = 0; | |
bec39940 DG |
3967 | struct lttng_ht_iter iter; |
3968 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3969 | struct ust_app *app; |
3970 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3971 | struct ust_app_channel *ua_chan; |
78f0bacd DG |
3972 | |
3973 | if (usess == NULL || uchan == NULL) { | |
3974 | ERR("Disabling UST global channel with NULL values"); | |
3975 | ret = -1; | |
3976 | goto error; | |
3977 | } | |
3978 | ||
d9bf3ca4 | 3979 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 3980 | uchan->name, usess->id); |
78f0bacd DG |
3981 | |
3982 | rcu_read_lock(); | |
3983 | ||
3984 | /* For every registered applications */ | |
852d0037 | 3985 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3986 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3987 | if (!app->compatible) { |
3988 | /* | |
3989 | * TODO: In time, we should notice the caller of this error by | |
3990 | * telling him that this is a version error. | |
3991 | */ | |
3992 | continue; | |
3993 | } | |
78f0bacd DG |
3994 | ua_sess = lookup_session_by_app(usess, app); |
3995 | if (ua_sess == NULL) { | |
3996 | continue; | |
3997 | } | |
3998 | ||
8535a6d9 | 3999 | /* Get channel */ |
bec39940 DG |
4000 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4001 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
4002 | /* If the session if found for the app, the channel must be there */ |
4003 | assert(ua_chan_node); | |
4004 | ||
4005 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4006 | /* The channel must not be already disabled */ | |
4007 | assert(ua_chan->enabled == 1); | |
4008 | ||
4009 | /* Disable channel onto application */ | |
4010 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
4011 | if (ret < 0) { |
4012 | /* XXX: We might want to report this error at some point... */ | |
4013 | continue; | |
4014 | } | |
4015 | } | |
4016 | ||
4017 | rcu_read_unlock(); | |
4018 | ||
4019 | error: | |
4020 | return ret; | |
4021 | } | |
4022 | ||
4023 | /* | |
4024 | * For a specific UST session, enable the channel for all registered apps. | |
4025 | */ | |
35a9059d | 4026 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
4027 | struct ltt_ust_channel *uchan) |
4028 | { | |
4029 | int ret = 0; | |
bec39940 | 4030 | struct lttng_ht_iter iter; |
78f0bacd DG |
4031 | struct ust_app *app; |
4032 | struct ust_app_session *ua_sess; | |
4033 | ||
4034 | if (usess == NULL || uchan == NULL) { | |
4035 | ERR("Adding UST global channel to NULL values"); | |
4036 | ret = -1; | |
4037 | goto error; | |
4038 | } | |
4039 | ||
d9bf3ca4 | 4040 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 4041 | uchan->name, usess->id); |
78f0bacd DG |
4042 | |
4043 | rcu_read_lock(); | |
4044 | ||
4045 | /* For every registered applications */ | |
852d0037 | 4046 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4047 | if (!app->compatible) { |
4048 | /* | |
4049 | * TODO: In time, we should notice the caller of this error by | |
4050 | * telling him that this is a version error. | |
4051 | */ | |
4052 | continue; | |
4053 | } | |
78f0bacd DG |
4054 | ua_sess = lookup_session_by_app(usess, app); |
4055 | if (ua_sess == NULL) { | |
4056 | continue; | |
4057 | } | |
4058 | ||
4059 | /* Enable channel onto application */ | |
4060 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
4061 | if (ret < 0) { | |
4062 | /* XXX: We might want to report this error at some point... */ | |
4063 | continue; | |
4064 | } | |
4065 | } | |
4066 | ||
4067 | rcu_read_unlock(); | |
4068 | ||
4069 | error: | |
4070 | return ret; | |
4071 | } | |
4072 | ||
b0a40d28 DG |
4073 | /* |
4074 | * Disable an event in a channel and for a specific session. | |
4075 | */ | |
35a9059d DG |
4076 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
4077 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
4078 | { |
4079 | int ret = 0; | |
bec39940 | 4080 | struct lttng_ht_iter iter, uiter; |
700c5a9d | 4081 | struct lttng_ht_node_str *ua_chan_node; |
b0a40d28 DG |
4082 | struct ust_app *app; |
4083 | struct ust_app_session *ua_sess; | |
4084 | struct ust_app_channel *ua_chan; | |
4085 | struct ust_app_event *ua_event; | |
4086 | ||
4087 | DBG("UST app disabling event %s for all apps in channel " | |
d9bf3ca4 MD |
4088 | "%s for session id %" PRIu64, |
4089 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
4090 | |
4091 | rcu_read_lock(); | |
4092 | ||
4093 | /* For all registered applications */ | |
852d0037 | 4094 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4095 | if (!app->compatible) { |
4096 | /* | |
4097 | * TODO: In time, we should notice the caller of this error by | |
4098 | * telling him that this is a version error. | |
4099 | */ | |
4100 | continue; | |
4101 | } | |
b0a40d28 DG |
4102 | ua_sess = lookup_session_by_app(usess, app); |
4103 | if (ua_sess == NULL) { | |
4104 | /* Next app */ | |
4105 | continue; | |
4106 | } | |
4107 | ||
4108 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
4109 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4110 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 4111 | if (ua_chan_node == NULL) { |
d9bf3ca4 | 4112 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 4113 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
4114 | continue; |
4115 | } | |
4116 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4117 | ||
700c5a9d JR |
4118 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
4119 | uevent->filter, uevent->attr.loglevel, | |
4120 | uevent->exclusion); | |
4121 | if (ua_event == NULL) { | |
b0a40d28 | 4122 | DBG2("Event %s not found in channel %s for app pid %d." |
852d0037 | 4123 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
4124 | continue; |
4125 | } | |
b0a40d28 | 4126 | |
7f79d3a1 | 4127 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
4128 | if (ret < 0) { |
4129 | /* XXX: Report error someday... */ | |
4130 | continue; | |
4131 | } | |
4132 | } | |
4133 | ||
4134 | rcu_read_unlock(); | |
4135 | ||
4136 | return ret; | |
4137 | } | |
4138 | ||
421cb601 | 4139 | /* |
5b4a0ec0 | 4140 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 4141 | */ |
35a9059d | 4142 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
4143 | struct ltt_ust_channel *uchan) |
4144 | { | |
3d8ca23b | 4145 | int ret = 0, created; |
bec39940 | 4146 | struct lttng_ht_iter iter; |
48842b30 | 4147 | struct ust_app *app; |
3d8ca23b | 4148 | struct ust_app_session *ua_sess = NULL; |
48842b30 | 4149 | |
fc34caaa DG |
4150 | /* Very wrong code flow */ |
4151 | assert(usess); | |
4152 | assert(uchan); | |
421cb601 | 4153 | |
d9bf3ca4 | 4154 | DBG2("UST app adding channel %s to UST domain for session id %" PRIu64, |
a991f516 | 4155 | uchan->name, usess->id); |
48842b30 DG |
4156 | |
4157 | rcu_read_lock(); | |
421cb601 | 4158 | |
5b4a0ec0 | 4159 | /* For every registered applications */ |
852d0037 | 4160 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4161 | if (!app->compatible) { |
4162 | /* | |
4163 | * TODO: In time, we should notice the caller of this error by | |
4164 | * telling him that this is a version error. | |
4165 | */ | |
4166 | continue; | |
4167 | } | |
a24248b3 MD |
4168 | if (!(trace_ust_id_tracker_lookup(LTTNG_TRACKER_VPID, usess, app->pid) |
4169 | && trace_ust_id_tracker_lookup(LTTNG_TRACKER_VUID, usess, app->uid) | |
4170 | && trace_ust_id_tracker_lookup(LTTNG_TRACKER_VGID, usess, app->gid))) { | |
a9ad0c8f MD |
4171 | /* Skip. */ |
4172 | continue; | |
4173 | } | |
4174 | ||
edb67388 DG |
4175 | /* |
4176 | * Create session on the tracer side and add it to app session HT. Note | |
4177 | * that if session exist, it will simply return a pointer to the ust | |
4178 | * app session. | |
4179 | */ | |
03f91eaa | 4180 | ret = find_or_create_ust_app_session(usess, app, &ua_sess, &created); |
3d8ca23b DG |
4181 | if (ret < 0) { |
4182 | switch (ret) { | |
4183 | case -ENOTCONN: | |
4184 | /* | |
4185 | * The application's socket is not valid. Either a bad socket | |
4186 | * or a timeout on it. We can't inform the caller that for a | |
4187 | * specific app, the session failed so lets continue here. | |
4188 | */ | |
a7169585 | 4189 | ret = 0; /* Not an error. */ |
3d8ca23b DG |
4190 | continue; |
4191 | case -ENOMEM: | |
4192 | default: | |
4193 | goto error_rcu_unlock; | |
4194 | } | |
48842b30 | 4195 | } |
3d8ca23b | 4196 | assert(ua_sess); |
48842b30 | 4197 | |
d0b96690 | 4198 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
4199 | |
4200 | if (ua_sess->deleted) { | |
4201 | pthread_mutex_unlock(&ua_sess->lock); | |
4202 | continue; | |
4203 | } | |
4204 | ||
d65d2de8 DG |
4205 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, |
4206 | sizeof(uchan->name))) { | |
ad7a9107 DG |
4207 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, &uchan->attr); |
4208 | ret = 0; | |
d65d2de8 DG |
4209 | } else { |
4210 | /* Create channel onto application. We don't need the chan ref. */ | |
4211 | ret = create_ust_app_channel(ua_sess, uchan, app, | |
4212 | LTTNG_UST_CHAN_PER_CPU, usess, NULL); | |
4213 | } | |
d0b96690 | 4214 | pthread_mutex_unlock(&ua_sess->lock); |
3d8ca23b | 4215 | if (ret < 0) { |
3d8ca23b DG |
4216 | /* Cleanup the created session if it's the case. */ |
4217 | if (created) { | |
d0b96690 | 4218 | destroy_app_session(app, ua_sess); |
3d8ca23b | 4219 | } |
a7169585 MD |
4220 | switch (ret) { |
4221 | case -ENOTCONN: | |
4222 | /* | |
4223 | * The application's socket is not valid. Either a bad socket | |
4224 | * or a timeout on it. We can't inform the caller that for a | |
4225 | * specific app, the session failed so lets continue here. | |
4226 | */ | |
4227 | ret = 0; /* Not an error. */ | |
4228 | continue; | |
4229 | case -ENOMEM: | |
4230 | default: | |
4231 | goto error_rcu_unlock; | |
4232 | } | |
48842b30 | 4233 | } |
48842b30 | 4234 | } |
5b4a0ec0 | 4235 | |
95e047ff | 4236 | error_rcu_unlock: |
48842b30 | 4237 | rcu_read_unlock(); |
3c14c33f | 4238 | return ret; |
48842b30 DG |
4239 | } |
4240 | ||
5b4a0ec0 | 4241 | /* |
edb67388 | 4242 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 4243 | */ |
35a9059d | 4244 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
4245 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4246 | { | |
4247 | int ret = 0; | |
bec39940 | 4248 | struct lttng_ht_iter iter, uiter; |
18eace3b | 4249 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
4250 | struct ust_app *app; |
4251 | struct ust_app_session *ua_sess; | |
4252 | struct ust_app_channel *ua_chan; | |
4253 | struct ust_app_event *ua_event; | |
48842b30 | 4254 | |
d9bf3ca4 | 4255 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 4256 | uevent->attr.name, usess->id); |
48842b30 | 4257 | |
edb67388 DG |
4258 | /* |
4259 | * NOTE: At this point, this function is called only if the session and | |
4260 | * channel passed are already created for all apps. and enabled on the | |
4261 | * tracer also. | |
4262 | */ | |
4263 | ||
48842b30 | 4264 | rcu_read_lock(); |
421cb601 DG |
4265 | |
4266 | /* For all registered applications */ | |
852d0037 | 4267 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4268 | if (!app->compatible) { |
4269 | /* | |
4270 | * TODO: In time, we should notice the caller of this error by | |
4271 | * telling him that this is a version error. | |
4272 | */ | |
4273 | continue; | |
4274 | } | |
edb67388 | 4275 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4276 | if (!ua_sess) { |
4277 | /* The application has problem or is probably dead. */ | |
4278 | continue; | |
4279 | } | |
ba767faf | 4280 | |
d0b96690 DG |
4281 | pthread_mutex_lock(&ua_sess->lock); |
4282 | ||
b161602a MD |
4283 | if (ua_sess->deleted) { |
4284 | pthread_mutex_unlock(&ua_sess->lock); | |
4285 | continue; | |
4286 | } | |
4287 | ||
edb67388 | 4288 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4289 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4290 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
a7169585 MD |
4291 | /* |
4292 | * It is possible that the channel cannot be found is | |
4293 | * the channel/event creation occurs concurrently with | |
4294 | * an application exit. | |
4295 | */ | |
4296 | if (!ua_chan_node) { | |
4297 | pthread_mutex_unlock(&ua_sess->lock); | |
4298 | continue; | |
4299 | } | |
edb67388 DG |
4300 | |
4301 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4302 | ||
18eace3b DG |
4303 | /* Get event node */ |
4304 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
39c5a3a7 | 4305 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 4306 | if (ua_event == NULL) { |
7f79d3a1 | 4307 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 4308 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 4309 | goto next_app; |
35a9059d | 4310 | } |
35a9059d DG |
4311 | |
4312 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
4313 | if (ret < 0) { | |
d0b96690 | 4314 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 4315 | goto error; |
48842b30 | 4316 | } |
d0b96690 DG |
4317 | next_app: |
4318 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
4319 | } |
4320 | ||
7f79d3a1 | 4321 | error: |
edb67388 | 4322 | rcu_read_unlock(); |
edb67388 DG |
4323 | return ret; |
4324 | } | |
4325 | ||
4326 | /* | |
4327 | * For a specific existing UST session and UST channel, creates the event for | |
4328 | * all registered apps. | |
4329 | */ | |
35a9059d | 4330 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
4331 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4332 | { | |
4333 | int ret = 0; | |
bec39940 DG |
4334 | struct lttng_ht_iter iter, uiter; |
4335 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
4336 | struct ust_app *app; |
4337 | struct ust_app_session *ua_sess; | |
4338 | struct ust_app_channel *ua_chan; | |
4339 | ||
d9bf3ca4 | 4340 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 4341 | uevent->attr.name, usess->id); |
edb67388 | 4342 | |
edb67388 DG |
4343 | rcu_read_lock(); |
4344 | ||
4345 | /* For all registered applications */ | |
852d0037 | 4346 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4347 | if (!app->compatible) { |
4348 | /* | |
4349 | * TODO: In time, we should notice the caller of this error by | |
4350 | * telling him that this is a version error. | |
4351 | */ | |
4352 | continue; | |
4353 | } | |
edb67388 | 4354 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4355 | if (!ua_sess) { |
4356 | /* The application has problem or is probably dead. */ | |
4357 | continue; | |
4358 | } | |
48842b30 | 4359 | |
d0b96690 | 4360 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
4361 | |
4362 | if (ua_sess->deleted) { | |
4363 | pthread_mutex_unlock(&ua_sess->lock); | |
4364 | continue; | |
4365 | } | |
4366 | ||
48842b30 | 4367 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4368 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4369 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
4370 | /* If the channel is not found, there is a code flow error */ |
4371 | assert(ua_chan_node); | |
4372 | ||
48842b30 DG |
4373 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
4374 | ||
edb67388 | 4375 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 4376 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 4377 | if (ret < 0) { |
49c336c1 | 4378 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
4379 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
4380 | break; | |
4381 | } | |
4382 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 4383 | uevent->attr.name, app->pid); |
5b4a0ec0 | 4384 | continue; |
48842b30 | 4385 | } |
48842b30 | 4386 | } |
5b4a0ec0 | 4387 | |
48842b30 DG |
4388 | rcu_read_unlock(); |
4389 | ||
4390 | return ret; | |
4391 | } | |
4392 | ||
5b4a0ec0 DG |
4393 | /* |
4394 | * Start tracing for a specific UST session and app. | |
fad1ed2f JR |
4395 | * |
4396 | * Called with UST app session lock held. | |
4397 | * | |
5b4a0ec0 | 4398 | */ |
b34cbebf | 4399 | static |
421cb601 | 4400 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
4401 | { |
4402 | int ret = 0; | |
48842b30 | 4403 | struct ust_app_session *ua_sess; |
48842b30 | 4404 | |
852d0037 | 4405 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 4406 | |
509cbaf8 MD |
4407 | rcu_read_lock(); |
4408 | ||
e0c7ec2b DG |
4409 | if (!app->compatible) { |
4410 | goto end; | |
4411 | } | |
4412 | ||
421cb601 DG |
4413 | ua_sess = lookup_session_by_app(usess, app); |
4414 | if (ua_sess == NULL) { | |
d42f20df DG |
4415 | /* The session is in teardown process. Ignore and continue. */ |
4416 | goto end; | |
421cb601 | 4417 | } |
48842b30 | 4418 | |
d0b96690 DG |
4419 | pthread_mutex_lock(&ua_sess->lock); |
4420 | ||
b161602a MD |
4421 | if (ua_sess->deleted) { |
4422 | pthread_mutex_unlock(&ua_sess->lock); | |
4423 | goto end; | |
4424 | } | |
4425 | ||
aea829b3 DG |
4426 | /* Upon restart, we skip the setup, already done */ |
4427 | if (ua_sess->started) { | |
8be98f9a | 4428 | goto skip_setup; |
aea829b3 | 4429 | } |
8be98f9a | 4430 | |
a4b92340 DG |
4431 | /* Create directories if consumer is LOCAL and has a path defined. */ |
4432 | if (usess->consumer->type == CONSUMER_DST_LOCAL && | |
366a9222 JD |
4433 | usess->consumer->dst.session_root_path[0] != '\0') { |
4434 | char *tmp_path; | |
4435 | ||
61ba6b6d | 4436 | tmp_path = zmalloc(LTTNG_PATH_MAX); |
366a9222 JD |
4437 | if (!tmp_path) { |
4438 | ERR("Alloc tmp_path"); | |
4439 | goto error_unlock; | |
4440 | } | |
61ba6b6d | 4441 | ret = snprintf(tmp_path, LTTNG_PATH_MAX, "%s%s%s", |
366a9222 JD |
4442 | usess->consumer->dst.session_root_path, |
4443 | usess->consumer->chunk_path, | |
4444 | usess->consumer->subdir); | |
61ba6b6d | 4445 | if (ret >= LTTNG_PATH_MAX) { |
366a9222 | 4446 | ERR("Local destination path exceeds the maximal allowed length of %i bytes (needs %i bytes) with path = \"%s%s%s\"", |
61ba6b6d | 4447 | LTTNG_PATH_MAX, ret, |
366a9222 JD |
4448 | usess->consumer->dst.session_root_path, |
4449 | usess->consumer->chunk_path, | |
4450 | usess->consumer->subdir); | |
4451 | goto error_unlock; | |
4452 | } | |
4453 | ||
4454 | DBG("Creating directory path for local tracing: \"%s\"", | |
4455 | tmp_path); | |
4456 | ret = run_as_mkdir_recursive(tmp_path, S_IRWXU | S_IRWXG, | |
4457 | ua_sess->euid, ua_sess->egid); | |
4458 | free(tmp_path); | |
a4b92340 | 4459 | if (ret < 0) { |
df5b86c8 | 4460 | if (errno != EEXIST) { |
a4b92340 | 4461 | ERR("Trace directory creation error"); |
d0b96690 | 4462 | goto error_unlock; |
421cb601 | 4463 | } |
173af62f | 4464 | } |
7753dea8 | 4465 | } |
aea829b3 | 4466 | |
d65d2de8 DG |
4467 | /* |
4468 | * Create the metadata for the application. This returns gracefully if a | |
4469 | * metadata was already set for the session. | |
4470 | */ | |
ad7a9107 | 4471 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer); |
421cb601 | 4472 | if (ret < 0) { |
d0b96690 | 4473 | goto error_unlock; |
421cb601 | 4474 | } |
48842b30 | 4475 | |
840cb59c | 4476 | health_code_update(); |
86acf0da | 4477 | |
8be98f9a | 4478 | skip_setup: |
421cb601 | 4479 | /* This start the UST tracing */ |
fb45065e | 4480 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4481 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
fb45065e | 4482 | pthread_mutex_unlock(&app->sock_lock); |
421cb601 | 4483 | if (ret < 0) { |
ffe60014 DG |
4484 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4485 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
4486 | app->pid, ret); | |
4487 | } else { | |
4488 | DBG("UST app start session failed. Application is dead."); | |
3757b385 DG |
4489 | /* |
4490 | * This is normal behavior, an application can die during the | |
4491 | * creation process. Don't report an error so the execution can | |
4492 | * continue normally. | |
4493 | */ | |
4494 | pthread_mutex_unlock(&ua_sess->lock); | |
4495 | goto end; | |
ffe60014 | 4496 | } |
d0b96690 | 4497 | goto error_unlock; |
421cb601 | 4498 | } |
5b4a0ec0 | 4499 | |
55c3953d DG |
4500 | /* Indicate that the session has been started once */ |
4501 | ua_sess->started = 1; | |
4502 | ||
d0b96690 DG |
4503 | pthread_mutex_unlock(&ua_sess->lock); |
4504 | ||
840cb59c | 4505 | health_code_update(); |
86acf0da | 4506 | |
421cb601 | 4507 | /* Quiescent wait after starting trace */ |
fb45065e | 4508 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4509 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4510 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4511 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4512 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4513 | app->pid, ret); | |
4514 | } | |
48842b30 | 4515 | |
e0c7ec2b DG |
4516 | end: |
4517 | rcu_read_unlock(); | |
840cb59c | 4518 | health_code_update(); |
421cb601 | 4519 | return 0; |
48842b30 | 4520 | |
d0b96690 DG |
4521 | error_unlock: |
4522 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 4523 | rcu_read_unlock(); |
840cb59c | 4524 | health_code_update(); |
421cb601 DG |
4525 | return -1; |
4526 | } | |
48842b30 | 4527 | |
8be98f9a MD |
4528 | /* |
4529 | * Stop tracing for a specific UST session and app. | |
4530 | */ | |
b34cbebf | 4531 | static |
8be98f9a MD |
4532 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
4533 | { | |
4534 | int ret = 0; | |
4535 | struct ust_app_session *ua_sess; | |
7972aab2 | 4536 | struct ust_registry_session *registry; |
8be98f9a | 4537 | |
852d0037 | 4538 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
4539 | |
4540 | rcu_read_lock(); | |
4541 | ||
e0c7ec2b | 4542 | if (!app->compatible) { |
d88aee68 | 4543 | goto end_no_session; |
e0c7ec2b DG |
4544 | } |
4545 | ||
8be98f9a MD |
4546 | ua_sess = lookup_session_by_app(usess, app); |
4547 | if (ua_sess == NULL) { | |
d88aee68 | 4548 | goto end_no_session; |
8be98f9a MD |
4549 | } |
4550 | ||
d88aee68 DG |
4551 | pthread_mutex_lock(&ua_sess->lock); |
4552 | ||
b161602a MD |
4553 | if (ua_sess->deleted) { |
4554 | pthread_mutex_unlock(&ua_sess->lock); | |
4555 | goto end_no_session; | |
4556 | } | |
4557 | ||
9bc07046 DG |
4558 | /* |
4559 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
4560 | * that was never started. It's possible since we can have a fail start |
4561 | * from either the application manager thread or the command thread. Simply | |
4562 | * indicate that this is a stop error. | |
9bc07046 | 4563 | */ |
f9dfc3d9 | 4564 | if (!ua_sess->started) { |
c45536e1 DG |
4565 | goto error_rcu_unlock; |
4566 | } | |
7db205b5 | 4567 | |
840cb59c | 4568 | health_code_update(); |
86acf0da | 4569 | |
9d6c7d3f | 4570 | /* This inhibits UST tracing */ |
fb45065e | 4571 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4572 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
fb45065e | 4573 | pthread_mutex_unlock(&app->sock_lock); |
9d6c7d3f | 4574 | if (ret < 0) { |
ffe60014 DG |
4575 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4576 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
4577 | app->pid, ret); | |
4578 | } else { | |
4579 | DBG("UST app stop session failed. Application is dead."); | |
3757b385 DG |
4580 | /* |
4581 | * This is normal behavior, an application can die during the | |
4582 | * creation process. Don't report an error so the execution can | |
4583 | * continue normally. | |
4584 | */ | |
4585 | goto end_unlock; | |
ffe60014 | 4586 | } |
9d6c7d3f DG |
4587 | goto error_rcu_unlock; |
4588 | } | |
4589 | ||
840cb59c | 4590 | health_code_update(); |
86acf0da | 4591 | |
9d6c7d3f | 4592 | /* Quiescent wait after stopping trace */ |
fb45065e | 4593 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4594 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4595 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4596 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4597 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4598 | app->pid, ret); | |
4599 | } | |
9d6c7d3f | 4600 | |
840cb59c | 4601 | health_code_update(); |
86acf0da | 4602 | |
b34cbebf | 4603 | registry = get_session_registry(ua_sess); |
fad1ed2f JR |
4604 | |
4605 | /* The UST app session is held registry shall not be null. */ | |
b34cbebf | 4606 | assert(registry); |
1b532a60 | 4607 | |
ce34fcd0 MD |
4608 | /* Push metadata for application before freeing the application. */ |
4609 | (void) push_metadata(registry, ua_sess->consumer); | |
b34cbebf | 4610 | |
3757b385 | 4611 | end_unlock: |
b34cbebf MD |
4612 | pthread_mutex_unlock(&ua_sess->lock); |
4613 | end_no_session: | |
4614 | rcu_read_unlock(); | |
4615 | health_code_update(); | |
4616 | return 0; | |
4617 | ||
4618 | error_rcu_unlock: | |
4619 | pthread_mutex_unlock(&ua_sess->lock); | |
4620 | rcu_read_unlock(); | |
4621 | health_code_update(); | |
4622 | return -1; | |
4623 | } | |
4624 | ||
b34cbebf | 4625 | static |
c4b88406 MD |
4626 | int ust_app_flush_app_session(struct ust_app *app, |
4627 | struct ust_app_session *ua_sess) | |
b34cbebf | 4628 | { |
c4b88406 | 4629 | int ret, retval = 0; |
b34cbebf | 4630 | struct lttng_ht_iter iter; |
b34cbebf | 4631 | struct ust_app_channel *ua_chan; |
c4b88406 | 4632 | struct consumer_socket *socket; |
b34cbebf | 4633 | |
c4b88406 | 4634 | DBG("Flushing app session buffers for ust app pid %d", app->pid); |
b34cbebf MD |
4635 | |
4636 | rcu_read_lock(); | |
4637 | ||
4638 | if (!app->compatible) { | |
c4b88406 | 4639 | goto end_not_compatible; |
b34cbebf MD |
4640 | } |
4641 | ||
4642 | pthread_mutex_lock(&ua_sess->lock); | |
4643 | ||
b161602a MD |
4644 | if (ua_sess->deleted) { |
4645 | goto end_deleted; | |
4646 | } | |
4647 | ||
b34cbebf MD |
4648 | health_code_update(); |
4649 | ||
9d6c7d3f | 4650 | /* Flushing buffers */ |
c4b88406 MD |
4651 | socket = consumer_find_socket_by_bitness(app->bits_per_long, |
4652 | ua_sess->consumer); | |
ce34fcd0 MD |
4653 | |
4654 | /* Flush buffers and push metadata. */ | |
4655 | switch (ua_sess->buffer_type) { | |
4656 | case LTTNG_BUFFER_PER_PID: | |
4657 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, | |
4658 | node.node) { | |
4659 | health_code_update(); | |
ce34fcd0 MD |
4660 | ret = consumer_flush_channel(socket, ua_chan->key); |
4661 | if (ret) { | |
4662 | ERR("Error flushing consumer channel"); | |
4663 | retval = -1; | |
4664 | continue; | |
4665 | } | |
8be98f9a | 4666 | } |
ce34fcd0 MD |
4667 | break; |
4668 | case LTTNG_BUFFER_PER_UID: | |
4669 | default: | |
4670 | assert(0); | |
4671 | break; | |
8be98f9a | 4672 | } |
8be98f9a | 4673 | |
840cb59c | 4674 | health_code_update(); |
86acf0da | 4675 | |
b161602a | 4676 | end_deleted: |
d88aee68 | 4677 | pthread_mutex_unlock(&ua_sess->lock); |
ce34fcd0 | 4678 | |
c4b88406 MD |
4679 | end_not_compatible: |
4680 | rcu_read_unlock(); | |
4681 | health_code_update(); | |
4682 | return retval; | |
4683 | } | |
4684 | ||
4685 | /* | |
ce34fcd0 MD |
4686 | * Flush buffers for all applications for a specific UST session. |
4687 | * Called with UST session lock held. | |
c4b88406 MD |
4688 | */ |
4689 | static | |
ce34fcd0 | 4690 | int ust_app_flush_session(struct ltt_ust_session *usess) |
c4b88406 MD |
4691 | |
4692 | { | |
99b1411c | 4693 | int ret = 0; |
c4b88406 | 4694 | |
ce34fcd0 | 4695 | DBG("Flushing session buffers for all ust apps"); |
c4b88406 MD |
4696 | |
4697 | rcu_read_lock(); | |
4698 | ||
ce34fcd0 MD |
4699 | /* Flush buffers and push metadata. */ |
4700 | switch (usess->buffer_type) { | |
4701 | case LTTNG_BUFFER_PER_UID: | |
4702 | { | |
4703 | struct buffer_reg_uid *reg; | |
4704 | struct lttng_ht_iter iter; | |
4705 | ||
4706 | /* Flush all per UID buffers associated to that session. */ | |
4707 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
4708 | struct ust_registry_session *ust_session_reg; | |
4709 | struct buffer_reg_channel *reg_chan; | |
4710 | struct consumer_socket *socket; | |
4711 | ||
4712 | /* Get consumer socket to use to push the metadata.*/ | |
4713 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
4714 | usess->consumer); | |
4715 | if (!socket) { | |
4716 | /* Ignore request if no consumer is found for the session. */ | |
4717 | continue; | |
4718 | } | |
4719 | ||
4720 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
4721 | reg_chan, node.node) { | |
4722 | /* | |
4723 | * The following call will print error values so the return | |
4724 | * code is of little importance because whatever happens, we | |
4725 | * have to try them all. | |
4726 | */ | |
4727 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
4728 | } | |
4729 | ||
4730 | ust_session_reg = reg->registry->reg.ust; | |
4731 | /* Push metadata. */ | |
4732 | (void) push_metadata(ust_session_reg, usess->consumer); | |
4733 | } | |
ce34fcd0 MD |
4734 | break; |
4735 | } | |
4736 | case LTTNG_BUFFER_PER_PID: | |
4737 | { | |
4738 | struct ust_app_session *ua_sess; | |
4739 | struct lttng_ht_iter iter; | |
4740 | struct ust_app *app; | |
4741 | ||
4742 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4743 | ua_sess = lookup_session_by_app(usess, app); | |
4744 | if (ua_sess == NULL) { | |
4745 | continue; | |
4746 | } | |
4747 | (void) ust_app_flush_app_session(app, ua_sess); | |
4748 | } | |
4749 | break; | |
4750 | } | |
4751 | default: | |
99b1411c | 4752 | ret = -1; |
ce34fcd0 MD |
4753 | assert(0); |
4754 | break; | |
c4b88406 | 4755 | } |
c4b88406 | 4756 | |
7db205b5 | 4757 | rcu_read_unlock(); |
840cb59c | 4758 | health_code_update(); |
c4b88406 | 4759 | return ret; |
8be98f9a MD |
4760 | } |
4761 | ||
0dd01979 MD |
4762 | static |
4763 | int ust_app_clear_quiescent_app_session(struct ust_app *app, | |
4764 | struct ust_app_session *ua_sess) | |
4765 | { | |
4766 | int ret = 0; | |
4767 | struct lttng_ht_iter iter; | |
4768 | struct ust_app_channel *ua_chan; | |
4769 | struct consumer_socket *socket; | |
4770 | ||
4771 | DBG("Clearing stream quiescent state for ust app pid %d", app->pid); | |
4772 | ||
4773 | rcu_read_lock(); | |
4774 | ||
4775 | if (!app->compatible) { | |
4776 | goto end_not_compatible; | |
4777 | } | |
4778 | ||
4779 | pthread_mutex_lock(&ua_sess->lock); | |
4780 | ||
4781 | if (ua_sess->deleted) { | |
4782 | goto end_unlock; | |
4783 | } | |
4784 | ||
4785 | health_code_update(); | |
4786 | ||
4787 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
4788 | ua_sess->consumer); | |
4789 | if (!socket) { | |
4790 | ERR("Failed to find consumer (%" PRIu32 ") socket", | |
4791 | app->bits_per_long); | |
4792 | ret = -1; | |
4793 | goto end_unlock; | |
4794 | } | |
4795 | ||
4796 | /* Clear quiescent state. */ | |
4797 | switch (ua_sess->buffer_type) { | |
4798 | case LTTNG_BUFFER_PER_PID: | |
4799 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, | |
4800 | ua_chan, node.node) { | |
4801 | health_code_update(); | |
4802 | ret = consumer_clear_quiescent_channel(socket, | |
4803 | ua_chan->key); | |
4804 | if (ret) { | |
4805 | ERR("Error clearing quiescent state for consumer channel"); | |
4806 | ret = -1; | |
4807 | continue; | |
4808 | } | |
4809 | } | |
4810 | break; | |
4811 | case LTTNG_BUFFER_PER_UID: | |
4812 | default: | |
4813 | assert(0); | |
4814 | ret = -1; | |
4815 | break; | |
4816 | } | |
4817 | ||
4818 | health_code_update(); | |
4819 | ||
4820 | end_unlock: | |
4821 | pthread_mutex_unlock(&ua_sess->lock); | |
4822 | ||
4823 | end_not_compatible: | |
4824 | rcu_read_unlock(); | |
4825 | health_code_update(); | |
4826 | return ret; | |
4827 | } | |
4828 | ||
4829 | /* | |
4830 | * Clear quiescent state in each stream for all applications for a | |
4831 | * specific UST session. | |
4832 | * Called with UST session lock held. | |
4833 | */ | |
4834 | static | |
4835 | int ust_app_clear_quiescent_session(struct ltt_ust_session *usess) | |
4836 | ||
4837 | { | |
4838 | int ret = 0; | |
4839 | ||
4840 | DBG("Clearing stream quiescent state for all ust apps"); | |
4841 | ||
4842 | rcu_read_lock(); | |
4843 | ||
4844 | switch (usess->buffer_type) { | |
4845 | case LTTNG_BUFFER_PER_UID: | |
4846 | { | |
4847 | struct lttng_ht_iter iter; | |
4848 | struct buffer_reg_uid *reg; | |
4849 | ||
4850 | /* | |
4851 | * Clear quiescent for all per UID buffers associated to | |
4852 | * that session. | |
4853 | */ | |
4854 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
4855 | struct consumer_socket *socket; | |
4856 | struct buffer_reg_channel *reg_chan; | |
4857 | ||
4858 | /* Get associated consumer socket.*/ | |
4859 | socket = consumer_find_socket_by_bitness( | |
4860 | reg->bits_per_long, usess->consumer); | |
4861 | if (!socket) { | |
4862 | /* | |
4863 | * Ignore request if no consumer is found for | |
4864 | * the session. | |
4865 | */ | |
4866 | continue; | |
4867 | } | |
4868 | ||
4869 | cds_lfht_for_each_entry(reg->registry->channels->ht, | |
4870 | &iter.iter, reg_chan, node.node) { | |
4871 | /* | |
4872 | * The following call will print error values so | |
4873 | * the return code is of little importance | |
4874 | * because whatever happens, we have to try them | |
4875 | * all. | |
4876 | */ | |
4877 | (void) consumer_clear_quiescent_channel(socket, | |
4878 | reg_chan->consumer_key); | |
4879 | } | |
4880 | } | |
4881 | break; | |
4882 | } | |
4883 | case LTTNG_BUFFER_PER_PID: | |
4884 | { | |
4885 | struct ust_app_session *ua_sess; | |
4886 | struct lttng_ht_iter iter; | |
4887 | struct ust_app *app; | |
4888 | ||
4889 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, | |
4890 | pid_n.node) { | |
4891 | ua_sess = lookup_session_by_app(usess, app); | |
4892 | if (ua_sess == NULL) { | |
4893 | continue; | |
4894 | } | |
4895 | (void) ust_app_clear_quiescent_app_session(app, | |
4896 | ua_sess); | |
4897 | } | |
4898 | break; | |
4899 | } | |
4900 | default: | |
4901 | ret = -1; | |
4902 | assert(0); | |
4903 | break; | |
4904 | } | |
4905 | ||
4906 | rcu_read_unlock(); | |
4907 | health_code_update(); | |
4908 | return ret; | |
4909 | } | |
4910 | ||
84cd17c6 MD |
4911 | /* |
4912 | * Destroy a specific UST session in apps. | |
4913 | */ | |
3353de95 | 4914 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 4915 | { |
ffe60014 | 4916 | int ret; |
84cd17c6 | 4917 | struct ust_app_session *ua_sess; |
bec39940 | 4918 | struct lttng_ht_iter iter; |
d9bf3ca4 | 4919 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 4920 | |
852d0037 | 4921 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
4922 | |
4923 | rcu_read_lock(); | |
4924 | ||
e0c7ec2b DG |
4925 | if (!app->compatible) { |
4926 | goto end; | |
4927 | } | |
4928 | ||
84cd17c6 | 4929 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 4930 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 4931 | if (node == NULL) { |
d42f20df DG |
4932 | /* Session is being or is deleted. */ |
4933 | goto end; | |
84cd17c6 MD |
4934 | } |
4935 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 4936 | |
840cb59c | 4937 | health_code_update(); |
d0b96690 | 4938 | destroy_app_session(app, ua_sess); |
84cd17c6 | 4939 | |
840cb59c | 4940 | health_code_update(); |
7db205b5 | 4941 | |
84cd17c6 | 4942 | /* Quiescent wait after stopping trace */ |
fb45065e | 4943 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4944 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4945 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4946 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4947 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4948 | app->pid, ret); | |
4949 | } | |
e0c7ec2b DG |
4950 | end: |
4951 | rcu_read_unlock(); | |
840cb59c | 4952 | health_code_update(); |
84cd17c6 | 4953 | return 0; |
84cd17c6 MD |
4954 | } |
4955 | ||
5b4a0ec0 DG |
4956 | /* |
4957 | * Start tracing for the UST session. | |
4958 | */ | |
421cb601 DG |
4959 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
4960 | { | |
4961 | int ret = 0; | |
bec39940 | 4962 | struct lttng_ht_iter iter; |
421cb601 | 4963 | struct ust_app *app; |
48842b30 | 4964 | |
421cb601 DG |
4965 | DBG("Starting all UST traces"); |
4966 | ||
4967 | rcu_read_lock(); | |
421cb601 | 4968 | |
0dd01979 MD |
4969 | /* |
4970 | * In a start-stop-start use-case, we need to clear the quiescent state | |
4971 | * of each channel set by the prior stop command, thus ensuring that a | |
4972 | * following stop or destroy is sure to grab a timestamp_end near those | |
4973 | * operations, even if the packet is empty. | |
4974 | */ | |
4975 | (void) ust_app_clear_quiescent_session(usess); | |
4976 | ||
852d0037 | 4977 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
421cb601 | 4978 | ret = ust_app_start_trace(usess, app); |
48842b30 | 4979 | if (ret < 0) { |
5b4a0ec0 DG |
4980 | /* Continue to next apps even on error */ |
4981 | continue; | |
48842b30 | 4982 | } |
48842b30 | 4983 | } |
5b4a0ec0 | 4984 | |
48842b30 DG |
4985 | rcu_read_unlock(); |
4986 | ||
4987 | return 0; | |
4988 | } | |
487cf67c | 4989 | |
8be98f9a MD |
4990 | /* |
4991 | * Start tracing for the UST session. | |
ce34fcd0 | 4992 | * Called with UST session lock held. |
8be98f9a MD |
4993 | */ |
4994 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
4995 | { | |
4996 | int ret = 0; | |
bec39940 | 4997 | struct lttng_ht_iter iter; |
8be98f9a MD |
4998 | struct ust_app *app; |
4999 | ||
5000 | DBG("Stopping all UST traces"); | |
5001 | ||
5002 | rcu_read_lock(); | |
5003 | ||
b34cbebf MD |
5004 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
5005 | ret = ust_app_stop_trace(usess, app); | |
5006 | if (ret < 0) { | |
5007 | /* Continue to next apps even on error */ | |
5008 | continue; | |
5009 | } | |
5010 | } | |
5011 | ||
ce34fcd0 | 5012 | (void) ust_app_flush_session(usess); |
8be98f9a MD |
5013 | |
5014 | rcu_read_unlock(); | |
5015 | ||
5016 | return 0; | |
5017 | } | |
5018 | ||
84cd17c6 MD |
5019 | /* |
5020 | * Destroy app UST session. | |
5021 | */ | |
5022 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
5023 | { | |
5024 | int ret = 0; | |
bec39940 | 5025 | struct lttng_ht_iter iter; |
84cd17c6 MD |
5026 | struct ust_app *app; |
5027 | ||
5028 | DBG("Destroy all UST traces"); | |
5029 | ||
5030 | rcu_read_lock(); | |
5031 | ||
852d0037 | 5032 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 5033 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
5034 | if (ret < 0) { |
5035 | /* Continue to next apps even on error */ | |
5036 | continue; | |
5037 | } | |
5038 | } | |
5039 | ||
5040 | rcu_read_unlock(); | |
5041 | ||
5042 | return 0; | |
5043 | } | |
5044 | ||
a9ad0c8f MD |
5045 | static |
5046 | void ust_app_global_create(struct ltt_ust_session *usess, struct ust_app *app) | |
487cf67c | 5047 | { |
55c54cce | 5048 | int ret = 0; |
31746f93 | 5049 | struct lttng_ht_iter iter, uiter; |
3d8ca23b | 5050 | struct ust_app_session *ua_sess = NULL; |
487cf67c DG |
5051 | struct ust_app_channel *ua_chan; |
5052 | struct ust_app_event *ua_event; | |
727d5404 | 5053 | struct ust_app_ctx *ua_ctx; |
a9ad0c8f | 5054 | int is_created = 0; |
1f3580c7 | 5055 | |
03f91eaa | 5056 | ret = find_or_create_ust_app_session(usess, app, &ua_sess, &is_created); |
3d8ca23b DG |
5057 | if (ret < 0) { |
5058 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
5059 | goto error; |
5060 | } | |
a9ad0c8f MD |
5061 | if (!is_created) { |
5062 | /* App session already created. */ | |
5063 | goto end; | |
5064 | } | |
3d8ca23b | 5065 | assert(ua_sess); |
487cf67c | 5066 | |
d0b96690 DG |
5067 | pthread_mutex_lock(&ua_sess->lock); |
5068 | ||
b161602a MD |
5069 | if (ua_sess->deleted) { |
5070 | pthread_mutex_unlock(&ua_sess->lock); | |
5071 | goto end; | |
5072 | } | |
5073 | ||
284d8f55 | 5074 | /* |
d0b96690 | 5075 | * We can iterate safely here over all UST app session since the create ust |
284d8f55 DG |
5076 | * app session above made a shadow copy of the UST global domain from the |
5077 | * ltt ust session. | |
5078 | */ | |
bec39940 DG |
5079 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
5080 | node.node) { | |
ad7a9107 | 5081 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
a7169585 | 5082 | if (ret < 0 && ret != -ENOTCONN) { |
ad7a9107 | 5083 | /* |
a7169585 MD |
5084 | * Stop everything. On error, the application |
5085 | * failed, no more file descriptor are available | |
5086 | * or ENOMEM so stopping here is the only thing | |
5087 | * we can do for now. The only exception is | |
5088 | * -ENOTCONN, which indicates that the application | |
5089 | * has exit. | |
ad7a9107 DG |
5090 | */ |
5091 | goto error_unlock; | |
487cf67c DG |
5092 | } |
5093 | ||
31746f93 DG |
5094 | /* |
5095 | * Add context using the list so they are enabled in the same order the | |
5096 | * user added them. | |
5097 | */ | |
5098 | cds_list_for_each_entry(ua_ctx, &ua_chan->ctx_list, list) { | |
727d5404 DG |
5099 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); |
5100 | if (ret < 0) { | |
d0b96690 | 5101 | goto error_unlock; |
727d5404 DG |
5102 | } |
5103 | } | |
5104 | ||
5105 | ||
284d8f55 | 5106 | /* For each events */ |
bec39940 DG |
5107 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
5108 | node.node) { | |
284d8f55 DG |
5109 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
5110 | if (ret < 0) { | |
d0b96690 | 5111 | goto error_unlock; |
487cf67c | 5112 | } |
36dc12cc | 5113 | } |
487cf67c DG |
5114 | } |
5115 | ||
d0b96690 DG |
5116 | pthread_mutex_unlock(&ua_sess->lock); |
5117 | ||
14fb1ebe | 5118 | if (usess->active) { |
421cb601 | 5119 | ret = ust_app_start_trace(usess, app); |
36dc12cc | 5120 | if (ret < 0) { |
36dc12cc DG |
5121 | goto error; |
5122 | } | |
5123 | ||
852d0037 | 5124 | DBG2("UST trace started for app pid %d", app->pid); |
36dc12cc | 5125 | } |
a9ad0c8f | 5126 | end: |
ffe60014 | 5127 | /* Everything went well at this point. */ |
ffe60014 DG |
5128 | return; |
5129 | ||
d0b96690 DG |
5130 | error_unlock: |
5131 | pthread_mutex_unlock(&ua_sess->lock); | |
487cf67c | 5132 | error: |
ffe60014 | 5133 | if (ua_sess) { |
d0b96690 | 5134 | destroy_app_session(app, ua_sess); |
ffe60014 | 5135 | } |
487cf67c DG |
5136 | return; |
5137 | } | |
55cc08a6 | 5138 | |
a9ad0c8f MD |
5139 | static |
5140 | void ust_app_global_destroy(struct ltt_ust_session *usess, struct ust_app *app) | |
5141 | { | |
5142 | struct ust_app_session *ua_sess; | |
5143 | ||
5144 | ua_sess = lookup_session_by_app(usess, app); | |
5145 | if (ua_sess == NULL) { | |
5146 | return; | |
5147 | } | |
5148 | destroy_app_session(app, ua_sess); | |
5149 | } | |
5150 | ||
5151 | /* | |
5152 | * Add channels/events from UST global domain to registered apps at sock. | |
5153 | * | |
5154 | * Called with session lock held. | |
5155 | * Called with RCU read-side lock held. | |
5156 | */ | |
5157 | void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app) | |
5158 | { | |
5159 | assert(usess); | |
5160 | ||
5161 | DBG2("UST app global update for app sock %d for session id %" PRIu64, | |
5162 | app->sock, usess->id); | |
5163 | ||
5164 | if (!app->compatible) { | |
5165 | return; | |
5166 | } | |
5167 | ||
a24248b3 MD |
5168 | if (trace_ust_id_tracker_lookup(LTTNG_TRACKER_VPID, usess, app->pid) |
5169 | && trace_ust_id_tracker_lookup(LTTNG_TRACKER_VUID, usess, app->uid) | |
5170 | && trace_ust_id_tracker_lookup(LTTNG_TRACKER_VGID, usess, app->gid)) { | |
a9ad0c8f MD |
5171 | ust_app_global_create(usess, app); |
5172 | } else { | |
5173 | ust_app_global_destroy(usess, app); | |
5174 | } | |
5175 | } | |
5176 | ||
5177 | /* | |
5178 | * Called with session lock held. | |
5179 | */ | |
5180 | void ust_app_global_update_all(struct ltt_ust_session *usess) | |
5181 | { | |
5182 | struct lttng_ht_iter iter; | |
5183 | struct ust_app *app; | |
5184 | ||
5185 | rcu_read_lock(); | |
5186 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5187 | ust_app_global_update(usess, app); | |
5188 | } | |
5189 | rcu_read_unlock(); | |
5190 | } | |
5191 | ||
55cc08a6 DG |
5192 | /* |
5193 | * Add context to a specific channel for global UST domain. | |
5194 | */ | |
5195 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
5196 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
5197 | { | |
5198 | int ret = 0; | |
bec39940 DG |
5199 | struct lttng_ht_node_str *ua_chan_node; |
5200 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
5201 | struct ust_app_channel *ua_chan = NULL; |
5202 | struct ust_app_session *ua_sess; | |
5203 | struct ust_app *app; | |
5204 | ||
5205 | rcu_read_lock(); | |
5206 | ||
852d0037 | 5207 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
5208 | if (!app->compatible) { |
5209 | /* | |
5210 | * TODO: In time, we should notice the caller of this error by | |
5211 | * telling him that this is a version error. | |
5212 | */ | |
5213 | continue; | |
5214 | } | |
55cc08a6 DG |
5215 | ua_sess = lookup_session_by_app(usess, app); |
5216 | if (ua_sess == NULL) { | |
5217 | continue; | |
5218 | } | |
5219 | ||
d0b96690 | 5220 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
5221 | |
5222 | if (ua_sess->deleted) { | |
5223 | pthread_mutex_unlock(&ua_sess->lock); | |
5224 | continue; | |
5225 | } | |
5226 | ||
55cc08a6 | 5227 | /* Lookup channel in the ust app session */ |
bec39940 DG |
5228 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
5229 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 5230 | if (ua_chan_node == NULL) { |
d0b96690 | 5231 | goto next_app; |
55cc08a6 DG |
5232 | } |
5233 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
5234 | node); | |
c9edf082 | 5235 | ret = create_ust_app_channel_context(ua_chan, &uctx->ctx, app); |
55cc08a6 | 5236 | if (ret < 0) { |
d0b96690 | 5237 | goto next_app; |
55cc08a6 | 5238 | } |
d0b96690 DG |
5239 | next_app: |
5240 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
5241 | } |
5242 | ||
55cc08a6 DG |
5243 | rcu_read_unlock(); |
5244 | return ret; | |
5245 | } | |
5246 | ||
76d45b40 DG |
5247 | /* |
5248 | * Enable event for a channel from a UST session for a specific PID. | |
5249 | */ | |
5250 | int ust_app_enable_event_pid(struct ltt_ust_session *usess, | |
5251 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
5252 | { | |
5253 | int ret = 0; | |
bec39940 | 5254 | struct lttng_ht_iter iter; |
18eace3b | 5255 | struct lttng_ht_node_str *ua_chan_node; |
76d45b40 DG |
5256 | struct ust_app *app; |
5257 | struct ust_app_session *ua_sess; | |
5258 | struct ust_app_channel *ua_chan; | |
5259 | struct ust_app_event *ua_event; | |
5260 | ||
5261 | DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid); | |
5262 | ||
5263 | rcu_read_lock(); | |
5264 | ||
5265 | app = ust_app_find_by_pid(pid); | |
5266 | if (app == NULL) { | |
5267 | ERR("UST app enable event per PID %d not found", pid); | |
5268 | ret = -1; | |
d0b96690 | 5269 | goto end; |
76d45b40 DG |
5270 | } |
5271 | ||
e0c7ec2b DG |
5272 | if (!app->compatible) { |
5273 | ret = 0; | |
d0b96690 | 5274 | goto end; |
e0c7ec2b DG |
5275 | } |
5276 | ||
76d45b40 | 5277 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
5278 | if (!ua_sess) { |
5279 | /* The application has problem or is probably dead. */ | |
d0b96690 DG |
5280 | ret = 0; |
5281 | goto end; | |
c4a1715b | 5282 | } |
76d45b40 | 5283 | |
d0b96690 | 5284 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
5285 | |
5286 | if (ua_sess->deleted) { | |
5287 | ret = 0; | |
5288 | goto end_unlock; | |
5289 | } | |
5290 | ||
76d45b40 | 5291 | /* Lookup channel in the ust app session */ |
bec39940 DG |
5292 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
5293 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
76d45b40 DG |
5294 | /* If the channel is not found, there is a code flow error */ |
5295 | assert(ua_chan_node); | |
5296 | ||
5297 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
5298 | ||
18eace3b | 5299 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 5300 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 5301 | if (ua_event == NULL) { |
76d45b40 DG |
5302 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
5303 | if (ret < 0) { | |
d0b96690 | 5304 | goto end_unlock; |
76d45b40 DG |
5305 | } |
5306 | } else { | |
76d45b40 DG |
5307 | ret = enable_ust_app_event(ua_sess, ua_event, app); |
5308 | if (ret < 0) { | |
d0b96690 | 5309 | goto end_unlock; |
76d45b40 DG |
5310 | } |
5311 | } | |
5312 | ||
d0b96690 DG |
5313 | end_unlock: |
5314 | pthread_mutex_unlock(&ua_sess->lock); | |
5315 | end: | |
76d45b40 DG |
5316 | rcu_read_unlock(); |
5317 | return ret; | |
5318 | } | |
7f79d3a1 | 5319 | |
d0b96690 DG |
5320 | /* |
5321 | * Receive registration and populate the given msg structure. | |
5322 | * | |
5323 | * On success return 0 else a negative value returned by the ustctl call. | |
5324 | */ | |
5325 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
5326 | { | |
5327 | int ret; | |
5328 | uint32_t pid, ppid, uid, gid; | |
5329 | ||
5330 | assert(msg); | |
5331 | ||
5332 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
5333 | &pid, &ppid, &uid, &gid, | |
5334 | &msg->bits_per_long, | |
5335 | &msg->uint8_t_alignment, | |
5336 | &msg->uint16_t_alignment, | |
5337 | &msg->uint32_t_alignment, | |
5338 | &msg->uint64_t_alignment, | |
5339 | &msg->long_alignment, | |
5340 | &msg->byte_order, | |
5341 | msg->name); | |
5342 | if (ret < 0) { | |
5343 | switch (-ret) { | |
5344 | case EPIPE: | |
5345 | case ECONNRESET: | |
5346 | case LTTNG_UST_ERR_EXITING: | |
5347 | DBG3("UST app recv reg message failed. Application died"); | |
5348 | break; | |
5349 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
5350 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
5351 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
5352 | LTTNG_UST_ABI_MINOR_VERSION); | |
5353 | break; | |
5354 | default: | |
5355 | ERR("UST app recv reg message failed with ret %d", ret); | |
5356 | break; | |
5357 | } | |
5358 | goto error; | |
5359 | } | |
5360 | msg->pid = (pid_t) pid; | |
5361 | msg->ppid = (pid_t) ppid; | |
5362 | msg->uid = (uid_t) uid; | |
5363 | msg->gid = (gid_t) gid; | |
5364 | ||
5365 | error: | |
5366 | return ret; | |
5367 | } | |
5368 | ||
10b56aef MD |
5369 | /* |
5370 | * Return a ust app session object using the application object and the | |
5371 | * session object descriptor has a key. If not found, NULL is returned. | |
5372 | * A RCU read side lock MUST be acquired when calling this function. | |
5373 | */ | |
5374 | static struct ust_app_session *find_session_by_objd(struct ust_app *app, | |
5375 | int objd) | |
5376 | { | |
5377 | struct lttng_ht_node_ulong *node; | |
5378 | struct lttng_ht_iter iter; | |
5379 | struct ust_app_session *ua_sess = NULL; | |
5380 | ||
5381 | assert(app); | |
5382 | ||
5383 | lttng_ht_lookup(app->ust_sessions_objd, (void *)((unsigned long) objd), &iter); | |
5384 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5385 | if (node == NULL) { | |
5386 | DBG2("UST app session find by objd %d not found", objd); | |
5387 | goto error; | |
5388 | } | |
5389 | ||
5390 | ua_sess = caa_container_of(node, struct ust_app_session, ust_objd_node); | |
5391 | ||
5392 | error: | |
5393 | return ua_sess; | |
5394 | } | |
5395 | ||
d88aee68 DG |
5396 | /* |
5397 | * Return a ust app channel object using the application object and the channel | |
5398 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
5399 | * lock MUST be acquired before calling this function. | |
5400 | */ | |
d0b96690 DG |
5401 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
5402 | int objd) | |
5403 | { | |
5404 | struct lttng_ht_node_ulong *node; | |
5405 | struct lttng_ht_iter iter; | |
5406 | struct ust_app_channel *ua_chan = NULL; | |
5407 | ||
5408 | assert(app); | |
5409 | ||
5410 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
5411 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5412 | if (node == NULL) { | |
5413 | DBG2("UST app channel find by objd %d not found", objd); | |
5414 | goto error; | |
5415 | } | |
5416 | ||
5417 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
5418 | ||
5419 | error: | |
5420 | return ua_chan; | |
5421 | } | |
5422 | ||
d88aee68 DG |
5423 | /* |
5424 | * Reply to a register channel notification from an application on the notify | |
5425 | * socket. The channel metadata is also created. | |
5426 | * | |
5427 | * The session UST registry lock is acquired in this function. | |
5428 | * | |
5429 | * On success 0 is returned else a negative value. | |
5430 | */ | |
8eede835 | 5431 | static int reply_ust_register_channel(int sock, int cobjd, |
d0b96690 DG |
5432 | size_t nr_fields, struct ustctl_field *fields) |
5433 | { | |
5434 | int ret, ret_code = 0; | |
5435 | uint32_t chan_id, reg_count; | |
7972aab2 | 5436 | uint64_t chan_reg_key; |
d0b96690 DG |
5437 | enum ustctl_channel_header type; |
5438 | struct ust_app *app; | |
5439 | struct ust_app_channel *ua_chan; | |
5440 | struct ust_app_session *ua_sess; | |
7972aab2 | 5441 | struct ust_registry_session *registry; |
45893984 | 5442 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
5443 | |
5444 | rcu_read_lock(); | |
5445 | ||
5446 | /* Lookup application. If not found, there is a code flow error. */ | |
5447 | app = find_app_by_notify_sock(sock); | |
d88aee68 | 5448 | if (!app) { |
fad1ed2f | 5449 | DBG("Application socket %d is being torn down. Abort event notify", |
d88aee68 DG |
5450 | sock); |
5451 | ret = 0; | |
5452 | goto error_rcu_unlock; | |
5453 | } | |
d0b96690 | 5454 | |
4950b860 | 5455 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 5456 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 | 5457 | if (!ua_chan) { |
fad1ed2f | 5458 | DBG("Application channel is being torn down. Abort event notify"); |
4950b860 MD |
5459 | ret = 0; |
5460 | goto error_rcu_unlock; | |
5461 | } | |
5462 | ||
d0b96690 DG |
5463 | assert(ua_chan->session); |
5464 | ua_sess = ua_chan->session; | |
d0b96690 | 5465 | |
7972aab2 DG |
5466 | /* Get right session registry depending on the session buffer type. */ |
5467 | registry = get_session_registry(ua_sess); | |
fad1ed2f JR |
5468 | if (!registry) { |
5469 | DBG("Application session is being torn down. Abort event notify"); | |
5470 | ret = 0; | |
5471 | goto error_rcu_unlock; | |
5472 | }; | |
45893984 | 5473 | |
7972aab2 DG |
5474 | /* Depending on the buffer type, a different channel key is used. */ |
5475 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
5476 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 5477 | } else { |
7972aab2 | 5478 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
5479 | } |
5480 | ||
7972aab2 DG |
5481 | pthread_mutex_lock(®istry->lock); |
5482 | ||
5483 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
5484 | assert(chan_reg); | |
5485 | ||
5486 | if (!chan_reg->register_done) { | |
5487 | reg_count = ust_registry_get_event_count(chan_reg); | |
5488 | if (reg_count < 31) { | |
5489 | type = USTCTL_CHANNEL_HEADER_COMPACT; | |
5490 | } else { | |
5491 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
5492 | } | |
5493 | ||
5494 | chan_reg->nr_ctx_fields = nr_fields; | |
5495 | chan_reg->ctx_fields = fields; | |
fad1ed2f | 5496 | fields = NULL; |
7972aab2 | 5497 | chan_reg->header_type = type; |
d0b96690 | 5498 | } else { |
7972aab2 DG |
5499 | /* Get current already assigned values. */ |
5500 | type = chan_reg->header_type; | |
d0b96690 | 5501 | } |
7972aab2 DG |
5502 | /* Channel id is set during the object creation. */ |
5503 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
5504 | |
5505 | /* Append to metadata */ | |
7972aab2 DG |
5506 | if (!chan_reg->metadata_dumped) { |
5507 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
5508 | if (ret_code) { |
5509 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
5510 | goto reply; | |
5511 | } | |
5512 | } | |
5513 | ||
5514 | reply: | |
7972aab2 DG |
5515 | DBG3("UST app replying to register channel key %" PRIu64 |
5516 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
5517 | ret_code); | |
d0b96690 DG |
5518 | |
5519 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
5520 | if (ret < 0) { | |
5521 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5522 | ERR("UST app reply channel failed with ret %d", ret); | |
5523 | } else { | |
5524 | DBG3("UST app reply channel failed. Application died"); | |
5525 | } | |
5526 | goto error; | |
5527 | } | |
5528 | ||
7972aab2 DG |
5529 | /* This channel registry registration is completed. */ |
5530 | chan_reg->register_done = 1; | |
5531 | ||
d0b96690 | 5532 | error: |
7972aab2 | 5533 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 5534 | error_rcu_unlock: |
d0b96690 | 5535 | rcu_read_unlock(); |
fad1ed2f | 5536 | free(fields); |
d0b96690 DG |
5537 | return ret; |
5538 | } | |
5539 | ||
d88aee68 DG |
5540 | /* |
5541 | * Add event to the UST channel registry. When the event is added to the | |
5542 | * registry, the metadata is also created. Once done, this replies to the | |
5543 | * application with the appropriate error code. | |
5544 | * | |
5545 | * The session UST registry lock is acquired in the function. | |
5546 | * | |
5547 | * On success 0 is returned else a negative value. | |
5548 | */ | |
d0b96690 | 5549 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
2106efa0 PP |
5550 | char *sig, size_t nr_fields, struct ustctl_field *fields, |
5551 | int loglevel_value, char *model_emf_uri) | |
d0b96690 DG |
5552 | { |
5553 | int ret, ret_code; | |
5554 | uint32_t event_id = 0; | |
7972aab2 | 5555 | uint64_t chan_reg_key; |
d0b96690 DG |
5556 | struct ust_app *app; |
5557 | struct ust_app_channel *ua_chan; | |
5558 | struct ust_app_session *ua_sess; | |
7972aab2 | 5559 | struct ust_registry_session *registry; |
d0b96690 DG |
5560 | |
5561 | rcu_read_lock(); | |
5562 | ||
5563 | /* Lookup application. If not found, there is a code flow error. */ | |
5564 | app = find_app_by_notify_sock(sock); | |
d88aee68 | 5565 | if (!app) { |
fad1ed2f | 5566 | DBG("Application socket %d is being torn down. Abort event notify", |
d88aee68 DG |
5567 | sock); |
5568 | ret = 0; | |
5569 | goto error_rcu_unlock; | |
5570 | } | |
d0b96690 | 5571 | |
4950b860 | 5572 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 5573 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 | 5574 | if (!ua_chan) { |
fad1ed2f | 5575 | DBG("Application channel is being torn down. Abort event notify"); |
4950b860 MD |
5576 | ret = 0; |
5577 | goto error_rcu_unlock; | |
5578 | } | |
5579 | ||
d0b96690 DG |
5580 | assert(ua_chan->session); |
5581 | ua_sess = ua_chan->session; | |
5582 | ||
7972aab2 | 5583 | registry = get_session_registry(ua_sess); |
fad1ed2f JR |
5584 | if (!registry) { |
5585 | DBG("Application session is being torn down. Abort event notify"); | |
5586 | ret = 0; | |
5587 | goto error_rcu_unlock; | |
5588 | } | |
7972aab2 DG |
5589 | |
5590 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
5591 | chan_reg_key = ua_chan->tracing_channel_id; | |
5592 | } else { | |
5593 | chan_reg_key = ua_chan->key; | |
5594 | } | |
5595 | ||
5596 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 5597 | |
d5d629b5 DG |
5598 | /* |
5599 | * From this point on, this call acquires the ownership of the sig, fields | |
5600 | * and model_emf_uri meaning any free are done inside it if needed. These | |
5601 | * three variables MUST NOT be read/write after this. | |
5602 | */ | |
7972aab2 | 5603 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
2106efa0 PP |
5604 | sobjd, cobjd, name, sig, nr_fields, fields, |
5605 | loglevel_value, model_emf_uri, ua_sess->buffer_type, | |
5606 | &event_id, app); | |
fad1ed2f JR |
5607 | sig = NULL; |
5608 | fields = NULL; | |
5609 | model_emf_uri = NULL; | |
d0b96690 DG |
5610 | |
5611 | /* | |
5612 | * The return value is returned to ustctl so in case of an error, the | |
5613 | * application can be notified. In case of an error, it's important not to | |
5614 | * return a negative error or else the application will get closed. | |
5615 | */ | |
5616 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
5617 | if (ret < 0) { | |
5618 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5619 | ERR("UST app reply event failed with ret %d", ret); | |
5620 | } else { | |
5621 | DBG3("UST app reply event failed. Application died"); | |
5622 | } | |
5623 | /* | |
5624 | * No need to wipe the create event since the application socket will | |
5625 | * get close on error hence cleaning up everything by itself. | |
5626 | */ | |
5627 | goto error; | |
5628 | } | |
5629 | ||
7972aab2 DG |
5630 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
5631 | name, event_id); | |
d88aee68 | 5632 | |
d0b96690 | 5633 | error: |
7972aab2 | 5634 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 5635 | error_rcu_unlock: |
d0b96690 | 5636 | rcu_read_unlock(); |
fad1ed2f JR |
5637 | free(sig); |
5638 | free(fields); | |
5639 | free(model_emf_uri); | |
d0b96690 DG |
5640 | return ret; |
5641 | } | |
5642 | ||
10b56aef MD |
5643 | /* |
5644 | * Add enum to the UST session registry. Once done, this replies to the | |
5645 | * application with the appropriate error code. | |
5646 | * | |
5647 | * The session UST registry lock is acquired within this function. | |
5648 | * | |
5649 | * On success 0 is returned else a negative value. | |
5650 | */ | |
5651 | static int add_enum_ust_registry(int sock, int sobjd, char *name, | |
5652 | struct ustctl_enum_entry *entries, size_t nr_entries) | |
5653 | { | |
5654 | int ret = 0, ret_code; | |
5655 | struct ust_app *app; | |
5656 | struct ust_app_session *ua_sess; | |
5657 | struct ust_registry_session *registry; | |
5658 | uint64_t enum_id = -1ULL; | |
5659 | ||
5660 | rcu_read_lock(); | |
5661 | ||
5662 | /* Lookup application. If not found, there is a code flow error. */ | |
5663 | app = find_app_by_notify_sock(sock); | |
5664 | if (!app) { | |
5665 | /* Return an error since this is not an error */ | |
5666 | DBG("Application socket %d is being torn down. Aborting enum registration", | |
5667 | sock); | |
5668 | free(entries); | |
5669 | goto error_rcu_unlock; | |
5670 | } | |
5671 | ||
5672 | /* Lookup session by UST object descriptor. */ | |
5673 | ua_sess = find_session_by_objd(app, sobjd); | |
5674 | if (!ua_sess) { | |
5675 | /* Return an error since this is not an error */ | |
fad1ed2f | 5676 | DBG("Application session is being torn down (session not found). Aborting enum registration."); |
10b56aef MD |
5677 | free(entries); |
5678 | goto error_rcu_unlock; | |
5679 | } | |
5680 | ||
5681 | registry = get_session_registry(ua_sess); | |
fad1ed2f JR |
5682 | if (!registry) { |
5683 | DBG("Application session is being torn down (registry not found). Aborting enum registration."); | |
5684 | free(entries); | |
5685 | goto error_rcu_unlock; | |
5686 | } | |
10b56aef MD |
5687 | |
5688 | pthread_mutex_lock(®istry->lock); | |
5689 | ||
5690 | /* | |
5691 | * From this point on, the callee acquires the ownership of | |
5692 | * entries. The variable entries MUST NOT be read/written after | |
5693 | * call. | |
5694 | */ | |
5695 | ret_code = ust_registry_create_or_find_enum(registry, sobjd, name, | |
5696 | entries, nr_entries, &enum_id); | |
5697 | entries = NULL; | |
5698 | ||
5699 | /* | |
5700 | * The return value is returned to ustctl so in case of an error, the | |
5701 | * application can be notified. In case of an error, it's important not to | |
5702 | * return a negative error or else the application will get closed. | |
5703 | */ | |
5704 | ret = ustctl_reply_register_enum(sock, enum_id, ret_code); | |
5705 | if (ret < 0) { | |
5706 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5707 | ERR("UST app reply enum failed with ret %d", ret); | |
5708 | } else { | |
5709 | DBG3("UST app reply enum failed. Application died"); | |
5710 | } | |
5711 | /* | |
5712 | * No need to wipe the create enum since the application socket will | |
5713 | * get close on error hence cleaning up everything by itself. | |
5714 | */ | |
5715 | goto error; | |
5716 | } | |
5717 | ||
5718 | DBG3("UST registry enum %s added successfully or already found", name); | |
5719 | ||
5720 | error: | |
5721 | pthread_mutex_unlock(®istry->lock); | |
5722 | error_rcu_unlock: | |
5723 | rcu_read_unlock(); | |
5724 | return ret; | |
5725 | } | |
5726 | ||
d88aee68 DG |
5727 | /* |
5728 | * Handle application notification through the given notify socket. | |
5729 | * | |
5730 | * Return 0 on success or else a negative value. | |
5731 | */ | |
d0b96690 DG |
5732 | int ust_app_recv_notify(int sock) |
5733 | { | |
5734 | int ret; | |
5735 | enum ustctl_notify_cmd cmd; | |
5736 | ||
5737 | DBG3("UST app receiving notify from sock %d", sock); | |
5738 | ||
5739 | ret = ustctl_recv_notify(sock, &cmd); | |
5740 | if (ret < 0) { | |
5741 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5742 | ERR("UST app recv notify failed with ret %d", ret); | |
5743 | } else { | |
5744 | DBG3("UST app recv notify failed. Application died"); | |
5745 | } | |
5746 | goto error; | |
5747 | } | |
5748 | ||
5749 | switch (cmd) { | |
5750 | case USTCTL_NOTIFY_CMD_EVENT: | |
5751 | { | |
2106efa0 | 5752 | int sobjd, cobjd, loglevel_value; |
d0b96690 DG |
5753 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; |
5754 | size_t nr_fields; | |
5755 | struct ustctl_field *fields; | |
5756 | ||
5757 | DBG2("UST app ustctl register event received"); | |
5758 | ||
2106efa0 PP |
5759 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, |
5760 | &loglevel_value, &sig, &nr_fields, &fields, | |
5761 | &model_emf_uri); | |
d0b96690 DG |
5762 | if (ret < 0) { |
5763 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5764 | ERR("UST app recv event failed with ret %d", ret); | |
5765 | } else { | |
5766 | DBG3("UST app recv event failed. Application died"); | |
5767 | } | |
5768 | goto error; | |
5769 | } | |
5770 | ||
d5d629b5 DG |
5771 | /* |
5772 | * Add event to the UST registry coming from the notify socket. This | |
5773 | * call will free if needed the sig, fields and model_emf_uri. This | |
5774 | * code path loses the ownsership of these variables and transfer them | |
5775 | * to the this function. | |
5776 | */ | |
d0b96690 | 5777 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
2106efa0 | 5778 | fields, loglevel_value, model_emf_uri); |
d0b96690 DG |
5779 | if (ret < 0) { |
5780 | goto error; | |
5781 | } | |
5782 | ||
5783 | break; | |
5784 | } | |
5785 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
5786 | { | |
5787 | int sobjd, cobjd; | |
5788 | size_t nr_fields; | |
5789 | struct ustctl_field *fields; | |
5790 | ||
5791 | DBG2("UST app ustctl register channel received"); | |
5792 | ||
5793 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
5794 | &fields); | |
5795 | if (ret < 0) { | |
5796 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5797 | ERR("UST app recv channel failed with ret %d", ret); | |
5798 | } else { | |
5799 | DBG3("UST app recv channel failed. Application died"); | |
5800 | } | |
5801 | goto error; | |
5802 | } | |
5803 | ||
d5d629b5 DG |
5804 | /* |
5805 | * The fields ownership are transfered to this function call meaning | |
5806 | * that if needed it will be freed. After this, it's invalid to access | |
5807 | * fields or clean it up. | |
5808 | */ | |
8eede835 | 5809 | ret = reply_ust_register_channel(sock, cobjd, nr_fields, |
d0b96690 DG |
5810 | fields); |
5811 | if (ret < 0) { | |
5812 | goto error; | |
5813 | } | |
5814 | ||
5815 | break; | |
5816 | } | |
10b56aef MD |
5817 | case USTCTL_NOTIFY_CMD_ENUM: |
5818 | { | |
5819 | int sobjd; | |
5820 | char name[LTTNG_UST_SYM_NAME_LEN]; | |
5821 | size_t nr_entries; | |
5822 | struct ustctl_enum_entry *entries; | |
5823 | ||
5824 | DBG2("UST app ustctl register enum received"); | |
5825 | ||
5826 | ret = ustctl_recv_register_enum(sock, &sobjd, name, | |
5827 | &entries, &nr_entries); | |
5828 | if (ret < 0) { | |
5829 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5830 | ERR("UST app recv enum failed with ret %d", ret); | |
5831 | } else { | |
5832 | DBG3("UST app recv enum failed. Application died"); | |
5833 | } | |
5834 | goto error; | |
5835 | } | |
5836 | ||
5837 | /* Callee assumes ownership of entries */ | |
5838 | ret = add_enum_ust_registry(sock, sobjd, name, | |
5839 | entries, nr_entries); | |
5840 | if (ret < 0) { | |
5841 | goto error; | |
5842 | } | |
5843 | ||
5844 | break; | |
5845 | } | |
d0b96690 DG |
5846 | default: |
5847 | /* Should NEVER happen. */ | |
5848 | assert(0); | |
5849 | } | |
5850 | ||
5851 | error: | |
5852 | return ret; | |
5853 | } | |
d88aee68 DG |
5854 | |
5855 | /* | |
5856 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
5857 | * corresponding application. On failure, the call_rcu to close the socket is | |
5858 | * executed. If an application is found, it tries to delete it from the notify | |
5859 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
5860 | * | |
5861 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
5862 | * call RCU is not done but the rest of the cleanup is. | |
5863 | */ | |
5864 | void ust_app_notify_sock_unregister(int sock) | |
5865 | { | |
5866 | int err_enomem = 0; | |
5867 | struct lttng_ht_iter iter; | |
5868 | struct ust_app *app; | |
5869 | struct ust_app_notify_sock_obj *obj; | |
5870 | ||
5871 | assert(sock >= 0); | |
5872 | ||
5873 | rcu_read_lock(); | |
5874 | ||
5875 | obj = zmalloc(sizeof(*obj)); | |
5876 | if (!obj) { | |
5877 | /* | |
5878 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
5879 | * procedure but the call_rcu will not be called. In this case, we | |
5880 | * accept the fd leak rather than possibly creating an unsynchronized | |
5881 | * state between threads. | |
5882 | * | |
5883 | * TODO: The notify object should be created once the notify socket is | |
5884 | * registered and stored independantely from the ust app object. The | |
5885 | * tricky part is to synchronize the teardown of the application and | |
5886 | * this notify object. Let's keep that in mind so we can avoid this | |
5887 | * kind of shenanigans with ENOMEM in the teardown path. | |
5888 | */ | |
5889 | err_enomem = 1; | |
5890 | } else { | |
5891 | obj->fd = sock; | |
5892 | } | |
5893 | ||
5894 | DBG("UST app notify socket unregister %d", sock); | |
5895 | ||
5896 | /* | |
5897 | * Lookup application by notify socket. If this fails, this means that the | |
5898 | * hash table delete has already been done by the application | |
5899 | * unregistration process so we can safely close the notify socket in a | |
5900 | * call RCU. | |
5901 | */ | |
5902 | app = find_app_by_notify_sock(sock); | |
5903 | if (!app) { | |
5904 | goto close_socket; | |
5905 | } | |
5906 | ||
5907 | iter.iter.node = &app->notify_sock_n.node; | |
5908 | ||
5909 | /* | |
5910 | * Whatever happens here either we fail or succeed, in both cases we have | |
5911 | * to close the socket after a grace period to continue to the call RCU | |
5912 | * here. If the deletion is successful, the application is not visible | |
5913 | * anymore by other threads and is it fails it means that it was already | |
5914 | * deleted from the hash table so either way we just have to close the | |
5915 | * socket. | |
5916 | */ | |
5917 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
5918 | ||
5919 | close_socket: | |
5920 | rcu_read_unlock(); | |
5921 | ||
5922 | /* | |
5923 | * Close socket after a grace period to avoid for the socket to be reused | |
5924 | * before the application object is freed creating potential race between | |
5925 | * threads trying to add unique in the global hash table. | |
5926 | */ | |
5927 | if (!err_enomem) { | |
5928 | call_rcu(&obj->head, close_notify_sock_rcu); | |
5929 | } | |
5930 | } | |
f45e313d DG |
5931 | |
5932 | /* | |
5933 | * Destroy a ust app data structure and free its memory. | |
5934 | */ | |
5935 | void ust_app_destroy(struct ust_app *app) | |
5936 | { | |
5937 | if (!app) { | |
5938 | return; | |
5939 | } | |
5940 | ||
5941 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
5942 | } | |
6dc3064a DG |
5943 | |
5944 | /* | |
5945 | * Take a snapshot for a given UST session. The snapshot is sent to the given | |
5946 | * output. | |
5947 | * | |
5948 | * Return 0 on success or else a negative value. | |
5949 | */ | |
5950 | int ust_app_snapshot_record(struct ltt_ust_session *usess, | |
d07ceecd MD |
5951 | struct snapshot_output *output, int wait, |
5952 | uint64_t nb_packets_per_stream) | |
6dc3064a DG |
5953 | { |
5954 | int ret = 0; | |
5955 | struct lttng_ht_iter iter; | |
5956 | struct ust_app *app; | |
af706bb7 | 5957 | char pathname[PATH_MAX]; |
e098433c JG |
5958 | struct ltt_session *session; |
5959 | uint64_t trace_archive_id; | |
6dc3064a DG |
5960 | |
5961 | assert(usess); | |
5962 | assert(output); | |
5963 | ||
5964 | rcu_read_lock(); | |
5965 | ||
e098433c JG |
5966 | session = session_find_by_id(usess->id); |
5967 | assert(session); | |
5968 | assert(pthread_mutex_trylock(&session->lock)); | |
5969 | assert(session_trylock_list()); | |
5970 | trace_archive_id = session->current_archive_id; | |
5971 | ||
8c924c7b MD |
5972 | switch (usess->buffer_type) { |
5973 | case LTTNG_BUFFER_PER_UID: | |
5974 | { | |
5975 | struct buffer_reg_uid *reg; | |
6dc3064a | 5976 | |
8c924c7b MD |
5977 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
5978 | struct buffer_reg_channel *reg_chan; | |
5979 | struct consumer_socket *socket; | |
6dc3064a | 5980 | |
8c924c7b MD |
5981 | /* Get consumer socket to use to push the metadata.*/ |
5982 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
5983 | usess->consumer); | |
5984 | if (!socket) { | |
5985 | ret = -EINVAL; | |
5986 | goto error; | |
5987 | } | |
6dc3064a | 5988 | |
8c924c7b MD |
5989 | memset(pathname, 0, sizeof(pathname)); |
5990 | ret = snprintf(pathname, sizeof(pathname), | |
5991 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH, | |
5992 | reg->uid, reg->bits_per_long); | |
5993 | if (ret < 0) { | |
5994 | PERROR("snprintf snapshot path"); | |
5995 | goto error; | |
5996 | } | |
5997 | ||
5998 | /* Add the UST default trace dir to path. */ | |
5999 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
6000 | reg_chan, node.node) { | |
e098433c JG |
6001 | ret = consumer_snapshot_channel(socket, |
6002 | reg_chan->consumer_key, | |
6003 | output, 0, usess->uid, | |
6004 | usess->gid, pathname, wait, | |
6005 | nb_packets_per_stream, | |
6006 | trace_archive_id); | |
8c924c7b MD |
6007 | if (ret < 0) { |
6008 | goto error; | |
6009 | } | |
6010 | } | |
68808f4e DG |
6011 | ret = consumer_snapshot_channel(socket, |
6012 | reg->registry->reg.ust->metadata_key, output, 1, | |
e098433c JG |
6013 | usess->uid, usess->gid, pathname, wait, 0, |
6014 | trace_archive_id); | |
8c924c7b MD |
6015 | if (ret < 0) { |
6016 | goto error; | |
6017 | } | |
af706bb7 | 6018 | } |
8c924c7b MD |
6019 | break; |
6020 | } | |
6021 | case LTTNG_BUFFER_PER_PID: | |
6022 | { | |
6023 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6024 | struct consumer_socket *socket; | |
6025 | struct lttng_ht_iter chan_iter; | |
6026 | struct ust_app_channel *ua_chan; | |
6027 | struct ust_app_session *ua_sess; | |
6028 | struct ust_registry_session *registry; | |
6029 | ||
6030 | ua_sess = lookup_session_by_app(usess, app); | |
6031 | if (!ua_sess) { | |
6032 | /* Session not associated with this app. */ | |
6033 | continue; | |
6034 | } | |
af706bb7 | 6035 | |
8c924c7b MD |
6036 | /* Get the right consumer socket for the application. */ |
6037 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
6038 | output->consumer); | |
6039 | if (!socket) { | |
5c786ded | 6040 | ret = -EINVAL; |
5c786ded JD |
6041 | goto error; |
6042 | } | |
6043 | ||
8c924c7b MD |
6044 | /* Add the UST default trace dir to path. */ |
6045 | memset(pathname, 0, sizeof(pathname)); | |
6046 | ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "/%s", | |
6047 | ua_sess->path); | |
6dc3064a | 6048 | if (ret < 0) { |
8c924c7b | 6049 | PERROR("snprintf snapshot path"); |
6dc3064a DG |
6050 | goto error; |
6051 | } | |
6dc3064a | 6052 | |
8c924c7b MD |
6053 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, |
6054 | ua_chan, node.node) { | |
e098433c JG |
6055 | ret = consumer_snapshot_channel(socket, |
6056 | ua_chan->key, output, | |
6057 | 0, ua_sess->euid, ua_sess->egid, | |
6058 | pathname, wait, | |
6059 | nb_packets_per_stream, | |
6060 | trace_archive_id); | |
8c924c7b MD |
6061 | if (ret < 0) { |
6062 | goto error; | |
6063 | } | |
6064 | } | |
6065 | ||
6066 | registry = get_session_registry(ua_sess); | |
fad1ed2f JR |
6067 | if (!registry) { |
6068 | DBG("Application session is being torn down. Abort snapshot record."); | |
6069 | ret = -1; | |
6070 | goto error; | |
6071 | } | |
e098433c JG |
6072 | ret = consumer_snapshot_channel(socket, |
6073 | registry->metadata_key, output, | |
6074 | 1, ua_sess->euid, ua_sess->egid, | |
6075 | pathname, wait, 0, | |
6076 | trace_archive_id); | |
8c924c7b MD |
6077 | if (ret < 0) { |
6078 | goto error; | |
6079 | } | |
6080 | } | |
6081 | break; | |
6082 | } | |
6083 | default: | |
6084 | assert(0); | |
6085 | break; | |
6dc3064a DG |
6086 | } |
6087 | ||
6088 | error: | |
6089 | rcu_read_unlock(); | |
6090 | return ret; | |
6091 | } | |
5c786ded JD |
6092 | |
6093 | /* | |
d07ceecd | 6094 | * Return the size taken by one more packet per stream. |
5c786ded | 6095 | */ |
d07ceecd MD |
6096 | uint64_t ust_app_get_size_one_more_packet_per_stream(struct ltt_ust_session *usess, |
6097 | uint64_t cur_nr_packets) | |
5c786ded | 6098 | { |
d07ceecd | 6099 | uint64_t tot_size = 0; |
5c786ded JD |
6100 | struct ust_app *app; |
6101 | struct lttng_ht_iter iter; | |
6102 | ||
6103 | assert(usess); | |
6104 | ||
6105 | switch (usess->buffer_type) { | |
6106 | case LTTNG_BUFFER_PER_UID: | |
6107 | { | |
6108 | struct buffer_reg_uid *reg; | |
6109 | ||
6110 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
6111 | struct buffer_reg_channel *reg_chan; | |
6112 | ||
b7064eaa | 6113 | rcu_read_lock(); |
5c786ded JD |
6114 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
6115 | reg_chan, node.node) { | |
d07ceecd MD |
6116 | if (cur_nr_packets >= reg_chan->num_subbuf) { |
6117 | /* | |
6118 | * Don't take channel into account if we | |
6119 | * already grab all its packets. | |
6120 | */ | |
6121 | continue; | |
6122 | } | |
6123 | tot_size += reg_chan->subbuf_size * reg_chan->stream_count; | |
5c786ded | 6124 | } |
b7064eaa | 6125 | rcu_read_unlock(); |
5c786ded JD |
6126 | } |
6127 | break; | |
6128 | } | |
6129 | case LTTNG_BUFFER_PER_PID: | |
6130 | { | |
6131 | rcu_read_lock(); | |
6132 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6133 | struct ust_app_channel *ua_chan; | |
6134 | struct ust_app_session *ua_sess; | |
6135 | struct lttng_ht_iter chan_iter; | |
6136 | ||
6137 | ua_sess = lookup_session_by_app(usess, app); | |
6138 | if (!ua_sess) { | |
6139 | /* Session not associated with this app. */ | |
6140 | continue; | |
6141 | } | |
6142 | ||
6143 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
6144 | ua_chan, node.node) { | |
d07ceecd MD |
6145 | if (cur_nr_packets >= ua_chan->attr.num_subbuf) { |
6146 | /* | |
6147 | * Don't take channel into account if we | |
6148 | * already grab all its packets. | |
6149 | */ | |
6150 | continue; | |
6151 | } | |
6152 | tot_size += ua_chan->attr.subbuf_size * ua_chan->streams.count; | |
5c786ded JD |
6153 | } |
6154 | } | |
6155 | rcu_read_unlock(); | |
6156 | break; | |
6157 | } | |
6158 | default: | |
6159 | assert(0); | |
6160 | break; | |
6161 | } | |
6162 | ||
d07ceecd | 6163 | return tot_size; |
5c786ded | 6164 | } |
fb83fe64 JD |
6165 | |
6166 | int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id, | |
6167 | struct cds_list_head *buffer_reg_uid_list, | |
6168 | struct consumer_output *consumer, uint64_t uchan_id, | |
6169 | int overwrite, uint64_t *discarded, uint64_t *lost) | |
6170 | { | |
6171 | int ret; | |
6172 | uint64_t consumer_chan_key; | |
6173 | ||
70dd8162 MD |
6174 | *discarded = 0; |
6175 | *lost = 0; | |
6176 | ||
fb83fe64 | 6177 | ret = buffer_reg_uid_consumer_channel_key( |
76604852 | 6178 | buffer_reg_uid_list, uchan_id, &consumer_chan_key); |
fb83fe64 | 6179 | if (ret < 0) { |
70dd8162 MD |
6180 | /* Not found */ |
6181 | ret = 0; | |
fb83fe64 JD |
6182 | goto end; |
6183 | } | |
6184 | ||
6185 | if (overwrite) { | |
6186 | ret = consumer_get_lost_packets(ust_session_id, | |
6187 | consumer_chan_key, consumer, lost); | |
6188 | } else { | |
6189 | ret = consumer_get_discarded_events(ust_session_id, | |
6190 | consumer_chan_key, consumer, discarded); | |
6191 | } | |
6192 | ||
6193 | end: | |
6194 | return ret; | |
6195 | } | |
6196 | ||
6197 | int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess, | |
6198 | struct ltt_ust_channel *uchan, | |
6199 | struct consumer_output *consumer, int overwrite, | |
6200 | uint64_t *discarded, uint64_t *lost) | |
6201 | { | |
6202 | int ret = 0; | |
6203 | struct lttng_ht_iter iter; | |
6204 | struct lttng_ht_node_str *ua_chan_node; | |
6205 | struct ust_app *app; | |
6206 | struct ust_app_session *ua_sess; | |
6207 | struct ust_app_channel *ua_chan; | |
6208 | ||
70dd8162 MD |
6209 | *discarded = 0; |
6210 | *lost = 0; | |
6211 | ||
fb83fe64 JD |
6212 | rcu_read_lock(); |
6213 | /* | |
70dd8162 MD |
6214 | * Iterate over every registered applications. Sum counters for |
6215 | * all applications containing requested session and channel. | |
fb83fe64 JD |
6216 | */ |
6217 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6218 | struct lttng_ht_iter uiter; | |
6219 | ||
6220 | ua_sess = lookup_session_by_app(usess, app); | |
6221 | if (ua_sess == NULL) { | |
6222 | continue; | |
6223 | } | |
6224 | ||
6225 | /* Get channel */ | |
ee022399 | 6226 | lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &uiter); |
fb83fe64 JD |
6227 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); |
6228 | /* If the session is found for the app, the channel must be there */ | |
6229 | assert(ua_chan_node); | |
6230 | ||
6231 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
6232 | ||
6233 | if (overwrite) { | |
70dd8162 MD |
6234 | uint64_t _lost; |
6235 | ||
fb83fe64 | 6236 | ret = consumer_get_lost_packets(usess->id, ua_chan->key, |
70dd8162 MD |
6237 | consumer, &_lost); |
6238 | if (ret < 0) { | |
6239 | break; | |
6240 | } | |
6241 | (*lost) += _lost; | |
fb83fe64 | 6242 | } else { |
70dd8162 MD |
6243 | uint64_t _discarded; |
6244 | ||
fb83fe64 | 6245 | ret = consumer_get_discarded_events(usess->id, |
70dd8162 MD |
6246 | ua_chan->key, consumer, &_discarded); |
6247 | if (ret < 0) { | |
6248 | break; | |
6249 | } | |
6250 | (*discarded) += _discarded; | |
fb83fe64 | 6251 | } |
fb83fe64 JD |
6252 | } |
6253 | ||
fb83fe64 JD |
6254 | rcu_read_unlock(); |
6255 | return ret; | |
6256 | } | |
c2561365 JD |
6257 | |
6258 | static | |
6259 | int ust_app_regenerate_statedump(struct ltt_ust_session *usess, | |
6260 | struct ust_app *app) | |
6261 | { | |
6262 | int ret = 0; | |
6263 | struct ust_app_session *ua_sess; | |
6264 | ||
6265 | DBG("Regenerating the metadata for ust app pid %d", app->pid); | |
6266 | ||
6267 | rcu_read_lock(); | |
6268 | ||
6269 | ua_sess = lookup_session_by_app(usess, app); | |
6270 | if (ua_sess == NULL) { | |
6271 | /* The session is in teardown process. Ignore and continue. */ | |
6272 | goto end; | |
6273 | } | |
6274 | ||
6275 | pthread_mutex_lock(&ua_sess->lock); | |
6276 | ||
6277 | if (ua_sess->deleted) { | |
6278 | goto end_unlock; | |
6279 | } | |
6280 | ||
6281 | pthread_mutex_lock(&app->sock_lock); | |
6282 | ret = ustctl_regenerate_statedump(app->sock, ua_sess->handle); | |
6283 | pthread_mutex_unlock(&app->sock_lock); | |
6284 | ||
6285 | end_unlock: | |
6286 | pthread_mutex_unlock(&ua_sess->lock); | |
6287 | ||
6288 | end: | |
6289 | rcu_read_unlock(); | |
6290 | health_code_update(); | |
6291 | return ret; | |
6292 | } | |
6293 | ||
6294 | /* | |
6295 | * Regenerate the statedump for each app in the session. | |
6296 | */ | |
6297 | int ust_app_regenerate_statedump_all(struct ltt_ust_session *usess) | |
6298 | { | |
6299 | int ret = 0; | |
6300 | struct lttng_ht_iter iter; | |
6301 | struct ust_app *app; | |
6302 | ||
6303 | DBG("Regenerating the metadata for all UST apps"); | |
6304 | ||
6305 | rcu_read_lock(); | |
6306 | ||
6307 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6308 | if (!app->compatible) { | |
6309 | continue; | |
6310 | } | |
6311 | ||
6312 | ret = ust_app_regenerate_statedump(usess, app); | |
6313 | if (ret < 0) { | |
6314 | /* Continue to the next app even on error */ | |
6315 | continue; | |
6316 | } | |
6317 | } | |
6318 | ||
6319 | rcu_read_unlock(); | |
6320 | ||
6321 | return 0; | |
6322 | } | |
5c408ad8 JD |
6323 | |
6324 | /* | |
6325 | * Rotate all the channels of a session. | |
6326 | * | |
6327 | * Return 0 on success or else a negative value. | |
6328 | */ | |
6329 | int ust_app_rotate_session(struct ltt_session *session, bool *ust_active) | |
6330 | { | |
6331 | int ret = 0; | |
6332 | struct lttng_ht_iter iter; | |
6333 | struct ust_app *app; | |
6334 | struct ltt_ust_session *usess = session->ust_session; | |
6335 | char pathname[LTTNG_PATH_MAX]; | |
6336 | ||
6337 | assert(usess); | |
6338 | ||
6339 | rcu_read_lock(); | |
6340 | ||
6341 | switch (usess->buffer_type) { | |
6342 | case LTTNG_BUFFER_PER_UID: | |
6343 | { | |
6344 | struct buffer_reg_uid *reg; | |
6345 | ||
6346 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
6347 | struct buffer_reg_channel *reg_chan; | |
6348 | struct consumer_socket *socket; | |
6349 | ||
6350 | /* Get consumer socket to use to push the metadata.*/ | |
6351 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
6352 | usess->consumer); | |
6353 | if (!socket) { | |
6354 | ret = -EINVAL; | |
6355 | goto error; | |
6356 | } | |
6357 | ||
6358 | /* | |
6359 | * Account the metadata channel first to make sure the | |
6360 | * number of channels waiting for a rotation cannot | |
6361 | * reach 0 before we complete the iteration over all | |
6362 | * the channels. | |
6363 | */ | |
6364 | ret = rotate_add_channel_pending( | |
6365 | reg->registry->reg.ust->metadata_key, | |
6366 | LTTNG_DOMAIN_UST, session); | |
6367 | if (ret < 0) { | |
b0cd9aea JG |
6368 | ret = reg->bits_per_long == 32 ? |
6369 | -LTTNG_ERR_UST_CONSUMER32_FAIL : | |
6370 | -LTTNG_ERR_UST_CONSUMER64_FAIL; | |
5c408ad8 JD |
6371 | goto error; |
6372 | } | |
6373 | ||
6374 | ret = snprintf(pathname, sizeof(pathname), | |
6375 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH, | |
6376 | reg->uid, reg->bits_per_long); | |
6377 | if (ret < 0 || ret == sizeof(pathname)) { | |
6378 | PERROR("Failed to format rotation path"); | |
6379 | goto error; | |
6380 | } | |
6381 | ||
6382 | /* Rotate the data channels. */ | |
6383 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
6384 | reg_chan, node.node) { | |
6385 | ret = rotate_add_channel_pending( | |
6386 | reg_chan->consumer_key, | |
6387 | LTTNG_DOMAIN_UST, session); | |
6388 | if (ret < 0) { | |
b0cd9aea JG |
6389 | ret = reg->bits_per_long == 32 ? |
6390 | -LTTNG_ERR_UST_CONSUMER32_FAIL : | |
6391 | -LTTNG_ERR_UST_CONSUMER64_FAIL; | |
5c408ad8 JD |
6392 | goto error; |
6393 | } | |
6394 | ret = consumer_rotate_channel(socket, | |
6395 | reg_chan->consumer_key, | |
6396 | usess->uid, usess->gid, | |
6397 | usess->consumer, pathname, | |
6398 | /* is_metadata_channel */ false, | |
ad9f5c17 | 6399 | session->current_archive_id, |
5c408ad8 JD |
6400 | &session->rotate_pending_relay); |
6401 | if (ret < 0) { | |
6402 | goto error; | |
6403 | } | |
6404 | } | |
6405 | ||
6406 | (void) push_metadata(reg->registry->reg.ust, usess->consumer); | |
6407 | ||
6408 | ret = consumer_rotate_channel(socket, | |
6409 | reg->registry->reg.ust->metadata_key, | |
6410 | usess->uid, usess->gid, | |
6411 | usess->consumer, pathname, | |
6412 | /* is_metadata_channel */ true, | |
ad9f5c17 | 6413 | session->current_archive_id, |
5c408ad8 JD |
6414 | &session->rotate_pending_relay); |
6415 | if (ret < 0) { | |
6416 | goto error; | |
6417 | } | |
6418 | *ust_active = true; | |
6419 | } | |
6420 | break; | |
6421 | } | |
6422 | case LTTNG_BUFFER_PER_PID: | |
6423 | { | |
6424 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6425 | struct consumer_socket *socket; | |
6426 | struct lttng_ht_iter chan_iter; | |
6427 | struct ust_app_channel *ua_chan; | |
6428 | struct ust_app_session *ua_sess; | |
6429 | struct ust_registry_session *registry; | |
6430 | ||
6431 | ua_sess = lookup_session_by_app(usess, app); | |
6432 | if (!ua_sess) { | |
6433 | /* Session not associated with this app. */ | |
6434 | continue; | |
6435 | } | |
6436 | ret = snprintf(pathname, sizeof(pathname), | |
6437 | DEFAULT_UST_TRACE_DIR "/%s", | |
6438 | ua_sess->path); | |
6439 | if (ret < 0 || ret == sizeof(pathname)) { | |
6440 | PERROR("Failed to format rotation path"); | |
6441 | goto error; | |
6442 | } | |
6443 | ||
6444 | /* Get the right consumer socket for the application. */ | |
6445 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
6446 | usess->consumer); | |
6447 | if (!socket) { | |
6448 | ret = -EINVAL; | |
6449 | goto error; | |
6450 | } | |
6451 | ||
6452 | registry = get_session_registry(ua_sess); | |
6453 | if (!registry) { | |
6454 | DBG("Application session is being torn down. Abort snapshot record."); | |
6455 | ret = -1; | |
6456 | goto error; | |
6457 | } | |
6458 | ||
6459 | /* | |
6460 | * Account the metadata channel first to make sure the | |
6461 | * number of channels waiting for a rotation cannot | |
6462 | * reach 0 before we complete the iteration over all | |
6463 | * the channels. | |
6464 | */ | |
6465 | ret = rotate_add_channel_pending(registry->metadata_key, | |
6466 | LTTNG_DOMAIN_UST, session); | |
6467 | if (ret < 0) { | |
b0cd9aea JG |
6468 | ret = app->bits_per_long == 32 ? |
6469 | -LTTNG_ERR_UST_CONSUMER32_FAIL : | |
6470 | -LTTNG_ERR_UST_CONSUMER64_FAIL; | |
5c408ad8 JD |
6471 | goto error; |
6472 | } | |
6473 | ||
6474 | /* Rotate the data channels. */ | |
6475 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
6476 | ua_chan, node.node) { | |
6477 | ret = rotate_add_channel_pending( | |
6478 | ua_chan->key, LTTNG_DOMAIN_UST, | |
6479 | session); | |
6480 | if (ret < 0) { | |
b0cd9aea JG |
6481 | ret = app->bits_per_long == 32 ? |
6482 | -LTTNG_ERR_UST_CONSUMER32_FAIL : | |
6483 | -LTTNG_ERR_UST_CONSUMER64_FAIL; | |
5c408ad8 JD |
6484 | goto error; |
6485 | } | |
6486 | ret = consumer_rotate_channel(socket, ua_chan->key, | |
6487 | ua_sess->euid, ua_sess->egid, | |
6488 | ua_sess->consumer, pathname, | |
6489 | /* is_metadata_channel */ false, | |
ad9f5c17 | 6490 | session->current_archive_id, |
5c408ad8 JD |
6491 | &session->rotate_pending_relay); |
6492 | if (ret < 0) { | |
6493 | goto error; | |
6494 | } | |
6495 | } | |
6496 | ||
6497 | /* Rotate the metadata channel. */ | |
6498 | (void) push_metadata(registry, usess->consumer); | |
6499 | ret = consumer_rotate_channel(socket, registry->metadata_key, | |
6500 | ua_sess->euid, ua_sess->egid, | |
6501 | ua_sess->consumer, pathname, | |
6502 | /* is_metadata_channel */ true, | |
ad9f5c17 | 6503 | session->current_archive_id, |
5c408ad8 JD |
6504 | &session->rotate_pending_relay); |
6505 | if (ret < 0) { | |
6506 | goto error; | |
6507 | } | |
6508 | *ust_active = true; | |
6509 | } | |
6510 | break; | |
6511 | } | |
6512 | default: | |
6513 | assert(0); | |
6514 | break; | |
6515 | } | |
6516 | ||
6517 | ret = LTTNG_OK; | |
6518 | ||
6519 | error: | |
6520 | rcu_read_unlock(); | |
6521 | return ret; | |
6522 | } |