Commit | Line | Data |
---|---|---|
8020ceb5 MD |
1 | /* |
2 | * ltt-events.c | |
3 | * | |
4 | * Copyright 2010 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
5 | * | |
6 | * Holds LTTng per-session event registry. | |
7 | * | |
8 | * Dual LGPL v2.1/GPL v2 license. | |
9 | */ | |
10 | ||
b5234c06 MD |
11 | #define _GNU_SOURCE |
12 | #include <stdio.h> | |
8a98a75d | 13 | #include <endian.h> |
b5234c06 | 14 | #include <urcu/list.h> |
8165c8da | 15 | #include <urcu/hlist.h> |
b5234c06 | 16 | #include <pthread.h> |
b5234c06 | 17 | #include <uuid/uuid.h> |
b5234c06 | 18 | #include <errno.h> |
f4681817 MD |
19 | #include <sys/shm.h> |
20 | #include <sys/ipc.h> | |
44c72f10 MD |
21 | #include <stdint.h> |
22 | #include <stddef.h> | |
23 | ||
24 | #include <urcu-bp.h> | |
25 | #include <urcu/compiler.h> | |
26 | #include <urcu/uatomic.h> | |
27 | #include <urcu/arch.h> | |
28 | ||
29 | #include <lttng/tracepoint.h> | |
4318ae1b | 30 | #include <lttng/ust-events.h> |
44c72f10 MD |
31 | |
32 | #include <usterr-signal-safe.h> | |
33 | #include <helper.h> | |
1f18504e | 34 | #include "error.h" |
44c72f10 | 35 | |
8020ceb5 | 36 | #include "ltt-tracer.h" |
8165c8da | 37 | #include "ltt-tracer-core.h" |
b728d87e | 38 | #include "wait.h" |
8d8a24c8 | 39 | #include "../libringbuffer/shm.h" |
596c4223 | 40 | #include "jhash.h" |
8165c8da MD |
41 | |
42 | /* | |
43 | * The sessions mutex is the centralized mutex across UST tracing | |
17dfb34b MD |
44 | * control and probe registration. All operations within this file are |
45 | * called by the communication thread, under ust_lock protection. | |
8165c8da | 46 | */ |
2b2d6ff7 | 47 | static pthread_mutex_t sessions_mutex = PTHREAD_MUTEX_INITIALIZER; |
8165c8da | 48 | |
17dfb34b | 49 | void ust_lock(void) |
8165c8da MD |
50 | { |
51 | pthread_mutex_lock(&sessions_mutex); | |
52 | } | |
53 | ||
17dfb34b | 54 | void ust_unlock(void) |
8165c8da MD |
55 | { |
56 | pthread_mutex_unlock(&sessions_mutex); | |
57 | } | |
58 | ||
b5234c06 | 59 | static CDS_LIST_HEAD(sessions); |
8165c8da MD |
60 | |
61 | /* | |
62 | * Pending probes hash table, containing the registered ltt events for | |
63 | * which tracepoint probes are still missing. Protected by the sessions | |
64 | * mutex. | |
65 | */ | |
66 | #define PENDING_PROBE_HASH_BITS 6 | |
67 | #define PENDING_PROBE_HASH_SIZE (1 << PENDING_PROBE_HASH_BITS) | |
68 | static struct cds_hlist_head pending_probe_table[PENDING_PROBE_HASH_SIZE]; | |
69 | ||
70 | struct ust_pending_probe { | |
71 | struct ltt_event *event; | |
72 | struct cds_hlist_node node; | |
73 | char name[]; | |
74 | }; | |
8020ceb5 MD |
75 | |
76 | static void _ltt_event_destroy(struct ltt_event *event); | |
574a6217 | 77 | static void _ltt_loglevel_destroy(struct session_loglevel *sl); |
e6c12e3d | 78 | static void _ltt_wildcard_destroy(struct session_wildcard *sw); |
8020ceb5 MD |
79 | static void _ltt_channel_destroy(struct ltt_channel *chan); |
80 | static int _ltt_event_unregister(struct ltt_event *event); | |
81 | static | |
82 | int _ltt_event_metadata_statedump(struct ltt_session *session, | |
83 | struct ltt_channel *chan, | |
84 | struct ltt_event *event); | |
85 | static | |
86 | int _ltt_session_metadata_statedump(struct ltt_session *session); | |
87 | ||
8165c8da MD |
88 | /* |
89 | * called at event creation if probe is missing. | |
90 | * called with session mutex held. | |
91 | */ | |
92 | static | |
93 | int add_pending_probe(struct ltt_event *event, const char *name) | |
94 | { | |
95 | struct cds_hlist_head *head; | |
8165c8da MD |
96 | struct ust_pending_probe *e; |
97 | size_t name_len = strlen(name) + 1; | |
23c8854a | 98 | uint32_t hash = jhash(name, name_len - 1, 0); |
8165c8da MD |
99 | |
100 | head = &pending_probe_table[hash & (PENDING_PROBE_HASH_SIZE - 1)]; | |
101 | e = zmalloc(sizeof(struct ust_pending_probe) + name_len); | |
102 | if (!e) | |
103 | return -ENOMEM; | |
104 | memcpy(&e->name[0], name, name_len); | |
105 | cds_hlist_add_head(&e->node, head); | |
106 | e->event = event; | |
107 | event->pending_probe = e; | |
108 | return 0; | |
109 | } | |
110 | ||
111 | /* | |
112 | * remove a pending probe. called when at event teardown and when an | |
113 | * event is fixed (probe is loaded). | |
114 | * called with session mutex held. | |
115 | */ | |
116 | static | |
117 | void remove_pending_probe(struct ust_pending_probe *e) | |
118 | { | |
119 | if (!e) | |
120 | return; | |
121 | cds_hlist_del(&e->node); | |
122 | free(e); | |
123 | } | |
124 | ||
125 | /* | |
126 | * Called at library load: connect the probe on the events pending on | |
127 | * probe load. | |
128 | * called with session mutex held. | |
129 | */ | |
130 | int pending_probe_fix_events(const struct lttng_event_desc *desc) | |
131 | { | |
132 | struct cds_hlist_head *head; | |
133 | struct cds_hlist_node *node, *p; | |
134 | struct ust_pending_probe *e; | |
135 | const char *name = desc->name; | |
136 | size_t name_len = strlen(name) + 1; | |
23c8854a | 137 | uint32_t hash = jhash(name, name_len - 1, 0); |
8165c8da | 138 | int ret = 0; |
7ee3cc56 | 139 | struct lttng_ust_event event_param; |
8165c8da | 140 | |
574a6217 | 141 | /* |
1f18504e MD |
142 | * For this event, we need to lookup the loglevel. If active (in |
143 | * the active loglevels hash table), we must create the event. | |
144 | */ | |
574a6217 MD |
145 | if (desc->loglevel) { |
146 | const struct tracepoint_loglevel_entry *ev_ll; | |
147 | struct loglevel_entry *loglevel; | |
148 | ||
149 | ev_ll = *desc->loglevel; | |
150 | loglevel = get_loglevel(ev_ll->identifier); | |
48740cab MD |
151 | if (!loglevel) |
152 | loglevel = get_loglevel_value(ev_ll->value); | |
574a6217 MD |
153 | if (loglevel) { |
154 | struct session_loglevel *sl; | |
155 | ||
156 | cds_list_for_each_entry(sl, &loglevel->session_list, | |
157 | session_list) { | |
158 | struct ltt_event *ev; | |
159 | int ret; | |
160 | ||
7ee3cc56 MD |
161 | memcpy(&event_param, &sl->event_param, |
162 | sizeof(event_param)); | |
163 | memcpy(event_param.name, | |
164 | desc->name, | |
165 | sizeof(event_param.name)); | |
574a6217 MD |
166 | /* create event */ |
167 | ret = ltt_event_create(sl->chan, | |
7ee3cc56 | 168 | &event_param, NULL, |
574a6217 | 169 | &ev); |
7ee3cc56 MD |
170 | if (ret) { |
171 | DBG("Error creating event"); | |
574a6217 | 172 | continue; |
7ee3cc56 | 173 | } |
574a6217 MD |
174 | cds_list_add(&ev->loglevel_list, |
175 | &sl->events); | |
176 | } | |
177 | } | |
178 | } | |
1f18504e | 179 | |
e6c12e3d MD |
180 | /* Wildcard */ |
181 | { | |
182 | struct wildcard_entry *wildcard; | |
183 | ||
184 | wildcard = match_wildcard(desc->name); | |
185 | if (strcmp(desc->name, "lttng_ust:metadata") && wildcard) { | |
186 | struct session_wildcard *sw; | |
187 | ||
188 | cds_list_for_each_entry(sw, &wildcard->session_list, | |
189 | session_list) { | |
190 | struct ltt_event *ev; | |
191 | int ret; | |
192 | ||
193 | memcpy(&event_param, &sw->event_param, | |
194 | sizeof(event_param)); | |
195 | memcpy(event_param.name, | |
196 | desc->name, | |
197 | sizeof(event_param.name)); | |
198 | /* create event */ | |
199 | ret = ltt_event_create(sw->chan, | |
200 | &event_param, NULL, | |
201 | &ev); | |
202 | if (ret) { | |
203 | DBG("Error creating event"); | |
204 | continue; | |
205 | } | |
206 | cds_list_add(&ev->wildcard_list, | |
207 | &sw->events); | |
208 | } | |
209 | } | |
210 | } | |
211 | ||
8165c8da MD |
212 | head = &pending_probe_table[hash & (PENDING_PROBE_HASH_SIZE - 1)]; |
213 | cds_hlist_for_each_entry_safe(e, node, p, head, node) { | |
214 | struct ltt_event *event; | |
215 | struct ltt_channel *chan; | |
216 | ||
217 | if (strcmp(name, e->name)) | |
218 | continue; | |
219 | event = e->event; | |
220 | chan = event->chan; | |
221 | assert(!event->desc); | |
222 | event->desc = desc; | |
223 | event->pending_probe = NULL; | |
224 | remove_pending_probe(e); | |
225 | ret |= __tracepoint_probe_register(name, | |
226 | event->desc->probe_callback, | |
227 | event); | |
636c5aa4 MD |
228 | if (ret) |
229 | continue; | |
230 | event->id = chan->free_event_id++; | |
8165c8da MD |
231 | ret |= _ltt_event_metadata_statedump(chan->session, chan, |
232 | event); | |
233 | } | |
234 | return ret; | |
235 | } | |
236 | ||
8020ceb5 MD |
237 | void synchronize_trace(void) |
238 | { | |
8020ceb5 | 239 | synchronize_rcu(); |
8020ceb5 MD |
240 | } |
241 | ||
242 | struct ltt_session *ltt_session_create(void) | |
243 | { | |
244 | struct ltt_session *session; | |
245 | ||
b5234c06 | 246 | session = zmalloc(sizeof(struct ltt_session)); |
8020ceb5 MD |
247 | if (!session) |
248 | return NULL; | |
b5234c06 MD |
249 | CDS_INIT_LIST_HEAD(&session->chan); |
250 | CDS_INIT_LIST_HEAD(&session->events); | |
1f18504e | 251 | CDS_INIT_LIST_HEAD(&session->loglevels); |
e6c12e3d | 252 | CDS_INIT_LIST_HEAD(&session->wildcards); |
b5234c06 MD |
253 | uuid_generate(session->uuid); |
254 | cds_list_add(&session->list, &sessions); | |
8020ceb5 MD |
255 | return session; |
256 | } | |
257 | ||
258 | void ltt_session_destroy(struct ltt_session *session) | |
259 | { | |
260 | struct ltt_channel *chan, *tmpchan; | |
261 | struct ltt_event *event, *tmpevent; | |
574a6217 | 262 | struct session_loglevel *loglevel, *tmploglevel; |
e6c12e3d | 263 | struct session_wildcard *wildcard, *tmpwildcard; |
8020ceb5 MD |
264 | int ret; |
265 | ||
b5234c06 MD |
266 | CMM_ACCESS_ONCE(session->active) = 0; |
267 | cds_list_for_each_entry(event, &session->events, list) { | |
8020ceb5 MD |
268 | ret = _ltt_event_unregister(event); |
269 | WARN_ON(ret); | |
270 | } | |
271 | synchronize_trace(); /* Wait for in-flight events to complete */ | |
1f18504e MD |
272 | cds_list_for_each_entry_safe(loglevel, tmploglevel, &session->loglevels, list) |
273 | _ltt_loglevel_destroy(loglevel); | |
e6c12e3d MD |
274 | cds_list_for_each_entry_safe(wildcard, tmpwildcard, &session->wildcards, list) |
275 | _ltt_wildcard_destroy(wildcard); | |
b5234c06 | 276 | cds_list_for_each_entry_safe(event, tmpevent, &session->events, list) |
8020ceb5 | 277 | _ltt_event_destroy(event); |
b5234c06 | 278 | cds_list_for_each_entry_safe(chan, tmpchan, &session->chan, list) |
8020ceb5 | 279 | _ltt_channel_destroy(chan); |
b5234c06 | 280 | cds_list_del(&session->list); |
b5234c06 | 281 | free(session); |
8020ceb5 MD |
282 | } |
283 | ||
976fe9ea | 284 | int ltt_session_enable(struct ltt_session *session) |
8020ceb5 MD |
285 | { |
286 | int ret = 0; | |
287 | struct ltt_channel *chan; | |
288 | ||
8020ceb5 MD |
289 | if (session->active) { |
290 | ret = -EBUSY; | |
291 | goto end; | |
292 | } | |
293 | ||
294 | /* | |
295 | * Snapshot the number of events per channel to know the type of header | |
296 | * we need to use. | |
297 | */ | |
b5234c06 | 298 | cds_list_for_each_entry(chan, &session->chan, list) { |
8020ceb5 MD |
299 | if (chan->header_type) |
300 | continue; /* don't change it if session stop/restart */ | |
301 | if (chan->free_event_id < 31) | |
302 | chan->header_type = 1; /* compact */ | |
303 | else | |
304 | chan->header_type = 2; /* large */ | |
305 | } | |
306 | ||
b5234c06 MD |
307 | CMM_ACCESS_ONCE(session->active) = 1; |
308 | CMM_ACCESS_ONCE(session->been_active) = 1; | |
8020ceb5 | 309 | ret = _ltt_session_metadata_statedump(session); |
4b4de73e | 310 | if (ret) |
b5234c06 | 311 | CMM_ACCESS_ONCE(session->active) = 0; |
8020ceb5 | 312 | end: |
8020ceb5 MD |
313 | return ret; |
314 | } | |
315 | ||
976fe9ea | 316 | int ltt_session_disable(struct ltt_session *session) |
8020ceb5 MD |
317 | { |
318 | int ret = 0; | |
319 | ||
8020ceb5 MD |
320 | if (!session->active) { |
321 | ret = -EBUSY; | |
322 | goto end; | |
323 | } | |
b5234c06 | 324 | CMM_ACCESS_ONCE(session->active) = 0; |
8020ceb5 | 325 | end: |
8020ceb5 MD |
326 | return ret; |
327 | } | |
328 | ||
976fe9ea MD |
329 | int ltt_channel_enable(struct ltt_channel *channel) |
330 | { | |
331 | int old; | |
332 | ||
9beb36ba MD |
333 | if (channel == channel->session->metadata) |
334 | return -EPERM; | |
b5234c06 | 335 | old = uatomic_xchg(&channel->enabled, 1); |
976fe9ea MD |
336 | if (old) |
337 | return -EEXIST; | |
338 | return 0; | |
339 | } | |
340 | ||
341 | int ltt_channel_disable(struct ltt_channel *channel) | |
342 | { | |
343 | int old; | |
344 | ||
9beb36ba MD |
345 | if (channel == channel->session->metadata) |
346 | return -EPERM; | |
b5234c06 | 347 | old = uatomic_xchg(&channel->enabled, 0); |
976fe9ea MD |
348 | if (!old) |
349 | return -EEXIST; | |
350 | return 0; | |
351 | } | |
352 | ||
353 | int ltt_event_enable(struct ltt_event *event) | |
354 | { | |
355 | int old; | |
356 | ||
9beb36ba MD |
357 | if (event->chan == event->chan->session->metadata) |
358 | return -EPERM; | |
b5234c06 | 359 | old = uatomic_xchg(&event->enabled, 1); |
976fe9ea MD |
360 | if (old) |
361 | return -EEXIST; | |
362 | return 0; | |
363 | } | |
364 | ||
365 | int ltt_event_disable(struct ltt_event *event) | |
366 | { | |
367 | int old; | |
368 | ||
9beb36ba MD |
369 | if (event->chan == event->chan->session->metadata) |
370 | return -EPERM; | |
b5234c06 | 371 | old = uatomic_xchg(&event->enabled, 0); |
976fe9ea MD |
372 | if (!old) |
373 | return -EEXIST; | |
374 | return 0; | |
375 | } | |
376 | ||
8020ceb5 MD |
377 | struct ltt_channel *ltt_channel_create(struct ltt_session *session, |
378 | const char *transport_name, | |
379 | void *buf_addr, | |
380 | size_t subbuf_size, size_t num_subbuf, | |
381 | unsigned int switch_timer_interval, | |
193183fb MD |
382 | unsigned int read_timer_interval, |
383 | int *shm_fd, int *wait_fd, | |
d028eddb MD |
384 | uint64_t *memory_map_size, |
385 | struct ltt_channel *chan_priv_init) | |
8020ceb5 | 386 | { |
a3f61e7f | 387 | struct ltt_channel *chan = NULL; |
8020ceb5 MD |
388 | struct ltt_transport *transport; |
389 | ||
8020ceb5 MD |
390 | if (session->been_active) |
391 | goto active; /* Refuse to add channel to active session */ | |
392 | transport = ltt_transport_find(transport_name); | |
393 | if (!transport) { | |
b5234c06 | 394 | DBG("LTTng transport %s not found\n", |
8020ceb5 MD |
395 | transport_name); |
396 | goto notransport; | |
397 | } | |
d028eddb MD |
398 | chan_priv_init->id = session->free_chan_id++; |
399 | chan_priv_init->session = session; | |
8020ceb5 MD |
400 | /* |
401 | * Note: the channel creation op already writes into the packet | |
402 | * headers. Therefore the "chan" information used as input | |
403 | * should be already accessible. | |
404 | */ | |
a3f61e7f | 405 | chan = transport->ops.channel_create("[lttng]", buf_addr, |
8020ceb5 | 406 | subbuf_size, num_subbuf, switch_timer_interval, |
193183fb | 407 | read_timer_interval, shm_fd, wait_fd, |
d028eddb | 408 | memory_map_size, chan_priv_init); |
a3f61e7f | 409 | if (!chan) |
8020ceb5 | 410 | goto create_error; |
976fe9ea | 411 | chan->enabled = 1; |
8020ceb5 | 412 | chan->ops = &transport->ops; |
b5234c06 | 413 | cds_list_add(&chan->list, &session->chan); |
8020ceb5 MD |
414 | return chan; |
415 | ||
416 | create_error: | |
8020ceb5 MD |
417 | notransport: |
418 | active: | |
8020ceb5 MD |
419 | return NULL; |
420 | } | |
421 | ||
422 | /* | |
423 | * Only used internally at session destruction. | |
424 | */ | |
425 | static | |
426 | void _ltt_channel_destroy(struct ltt_channel *chan) | |
427 | { | |
b5234c06 | 428 | cds_list_del(&chan->list); |
8020ceb5 | 429 | lttng_destroy_context(chan->ctx); |
a3f61e7f | 430 | chan->ops->channel_destroy(chan); |
8020ceb5 MD |
431 | } |
432 | ||
1f18504e MD |
433 | int ltt_loglevel_create(struct ltt_channel *chan, |
434 | struct lttng_ust_event *event_param, | |
574a6217 | 435 | struct session_loglevel **_sl) |
1f18504e | 436 | { |
574a6217 | 437 | struct session_loglevel *sl; |
1f18504e | 438 | |
574a6217 MD |
439 | sl = add_loglevel(event_param->name, chan, event_param); |
440 | if (!sl || IS_ERR(sl)) { | |
441 | return PTR_ERR(sl); | |
1f18504e | 442 | } |
574a6217 | 443 | *_sl = sl; |
1f18504e MD |
444 | return 0; |
445 | } | |
446 | ||
447 | static | |
574a6217 | 448 | void _ltt_loglevel_destroy(struct session_loglevel *sl) |
1f18504e | 449 | { |
574a6217 | 450 | _remove_loglevel(sl); |
1f18504e MD |
451 | } |
452 | ||
e6c12e3d MD |
453 | int ltt_wildcard_create(struct ltt_channel *chan, |
454 | struct lttng_ust_event *event_param, | |
455 | struct session_wildcard **_sw) | |
456 | { | |
457 | struct session_wildcard *sw; | |
458 | ||
459 | sw = add_wildcard(event_param->name, chan, event_param); | |
460 | if (!sw || IS_ERR(sw)) { | |
461 | return PTR_ERR(sw); | |
462 | } | |
463 | *_sw = sw; | |
464 | return 0; | |
465 | } | |
466 | ||
467 | static | |
468 | void _ltt_wildcard_destroy(struct session_wildcard *sw) | |
469 | { | |
470 | _remove_wildcard(sw); | |
471 | } | |
472 | ||
8020ceb5 MD |
473 | /* |
474 | * Supports event creation while tracing session is active. | |
475 | */ | |
576599a0 MD |
476 | int ltt_event_create(struct ltt_channel *chan, |
477 | struct lttng_ust_event *event_param, | |
478 | void *filter, | |
479 | struct ltt_event **_event) | |
8020ceb5 MD |
480 | { |
481 | struct ltt_event *event; | |
576599a0 | 482 | int ret = 0; |
8020ceb5 | 483 | |
576599a0 MD |
484 | if (chan->used_event_id == -1UL) { |
485 | ret = -ENOMEM; | |
8020ceb5 | 486 | goto full; |
576599a0 | 487 | } |
8020ceb5 MD |
488 | /* |
489 | * This is O(n^2) (for each event, the loop is called at event | |
490 | * creation). Might require a hash if we have lots of events. | |
491 | */ | |
576599a0 MD |
492 | cds_list_for_each_entry(event, &chan->session->events, list) { |
493 | if (event->desc && !strcmp(event->desc->name, event_param->name)) { | |
494 | ret = -EEXIST; | |
8020ceb5 | 495 | goto exist; |
576599a0 MD |
496 | } |
497 | } | |
b5234c06 | 498 | event = zmalloc(sizeof(struct ltt_event)); |
576599a0 MD |
499 | if (!event) { |
500 | ret = -ENOMEM; | |
8020ceb5 | 501 | goto cache_error; |
576599a0 | 502 | } |
8020ceb5 MD |
503 | event->chan = chan; |
504 | event->filter = filter; | |
8165c8da MD |
505 | /* |
506 | * used_event_id counts the maximum number of event IDs that can | |
507 | * register if all probes register. | |
508 | */ | |
509 | chan->used_event_id++; | |
976fe9ea | 510 | event->enabled = 1; |
8020ceb5 MD |
511 | event->instrumentation = event_param->instrumentation; |
512 | /* Populate ltt_event structure before tracepoint registration. */ | |
b5234c06 | 513 | cmm_smp_wmb(); |
8020ceb5 | 514 | switch (event_param->instrumentation) { |
b5234c06 | 515 | case LTTNG_UST_TRACEPOINT: |
8020ceb5 | 516 | event->desc = ltt_event_get(event_param->name); |
8165c8da MD |
517 | if (event->desc) { |
518 | ret = __tracepoint_probe_register(event_param->name, | |
519 | event->desc->probe_callback, | |
520 | event); | |
521 | if (ret) | |
522 | goto register_error; | |
523 | event->id = chan->free_event_id++; | |
524 | } else { | |
525 | /* | |
526 | * If the probe is not present, event->desc stays NULL, | |
527 | * waiting for the probe to register, and the event->id | |
528 | * stays unallocated. | |
529 | */ | |
530 | ret = add_pending_probe(event, event_param->name); | |
531 | if (ret) | |
532 | goto add_pending_error; | |
533 | } | |
8020ceb5 | 534 | break; |
df854e41 | 535 | case LTTNG_UST_TRACEPOINT_LOGLEVEL: |
1f18504e | 536 | assert(0); |
df854e41 | 537 | break; |
8020ceb5 MD |
538 | default: |
539 | WARN_ON_ONCE(1); | |
540 | } | |
8165c8da MD |
541 | if (event->desc) { |
542 | ret = _ltt_event_metadata_statedump(chan->session, chan, event); | |
543 | if (ret) | |
544 | goto statedump_error; | |
545 | } | |
b5234c06 | 546 | cds_list_add(&event->list, &chan->session->events); |
576599a0 MD |
547 | *_event = event; |
548 | return 0; | |
8020ceb5 MD |
549 | |
550 | statedump_error: | |
8165c8da MD |
551 | if (event->desc) { |
552 | WARN_ON_ONCE(__tracepoint_probe_unregister(event_param->name, | |
553 | event->desc->probe_callback, | |
554 | event)); | |
555 | ltt_event_put(event->desc); | |
556 | } | |
557 | add_pending_error: | |
8020ceb5 | 558 | register_error: |
b5234c06 | 559 | free(event); |
8020ceb5 MD |
560 | cache_error: |
561 | exist: | |
562 | full: | |
576599a0 | 563 | return ret; |
8020ceb5 MD |
564 | } |
565 | ||
566 | /* | |
567 | * Only used internally at session destruction. | |
568 | */ | |
569 | int _ltt_event_unregister(struct ltt_event *event) | |
570 | { | |
571 | int ret = -EINVAL; | |
572 | ||
573 | switch (event->instrumentation) { | |
b5234c06 | 574 | case LTTNG_UST_TRACEPOINT: |
8165c8da MD |
575 | if (event->desc) { |
576 | ret = __tracepoint_probe_unregister(event->desc->name, | |
577 | event->desc->probe_callback, | |
578 | event); | |
579 | if (ret) | |
580 | return ret; | |
581 | } else { | |
582 | remove_pending_probe(event->pending_probe); | |
583 | ret = 0; | |
584 | } | |
8020ceb5 | 585 | break; |
8020ceb5 MD |
586 | default: |
587 | WARN_ON_ONCE(1); | |
588 | } | |
589 | return ret; | |
590 | } | |
591 | ||
592 | /* | |
593 | * Only used internally at session destruction. | |
594 | */ | |
595 | static | |
596 | void _ltt_event_destroy(struct ltt_event *event) | |
597 | { | |
598 | switch (event->instrumentation) { | |
b5234c06 | 599 | case LTTNG_UST_TRACEPOINT: |
8165c8da MD |
600 | if (event->desc) { |
601 | ltt_event_put(event->desc); | |
602 | } | |
8020ceb5 | 603 | break; |
8020ceb5 MD |
604 | default: |
605 | WARN_ON_ONCE(1); | |
606 | } | |
b5234c06 | 607 | cds_list_del(&event->list); |
8020ceb5 | 608 | lttng_destroy_context(event->ctx); |
b5234c06 | 609 | free(event); |
8020ceb5 MD |
610 | } |
611 | ||
612 | /* | |
613 | * We have exclusive access to our metadata buffer (protected by the | |
17dfb34b | 614 | * ust_lock), so we can do racy operations such as looking for |
8020ceb5 MD |
615 | * remaining space left in packet and write, since mutual exclusion |
616 | * protects us from concurrent writes. | |
617 | */ | |
618 | int lttng_metadata_printf(struct ltt_session *session, | |
619 | const char *fmt, ...) | |
620 | { | |
4cfec15c | 621 | struct lttng_ust_lib_ring_buffer_ctx ctx; |
8020ceb5 | 622 | struct ltt_channel *chan = session->metadata; |
b5234c06 | 623 | char *str = NULL; |
8020ceb5 MD |
624 | int ret = 0, waitret; |
625 | size_t len, reserve_len, pos; | |
626 | va_list ap; | |
627 | ||
b5234c06 | 628 | WARN_ON_ONCE(!CMM_ACCESS_ONCE(session->active)); |
8020ceb5 MD |
629 | |
630 | va_start(ap, fmt); | |
b5234c06 | 631 | ret = vasprintf(&str, fmt, ap); |
8020ceb5 | 632 | va_end(ap); |
b5234c06 | 633 | if (ret < 0) |
8020ceb5 MD |
634 | return -ENOMEM; |
635 | ||
636 | len = strlen(str); | |
637 | pos = 0; | |
638 | ||
639 | for (pos = 0; pos < len; pos += reserve_len) { | |
640 | reserve_len = min_t(size_t, | |
1d498196 | 641 | chan->ops->packet_avail_size(chan->chan, chan->handle), |
8020ceb5 MD |
642 | len - pos); |
643 | lib_ring_buffer_ctx_init(&ctx, chan->chan, NULL, reserve_len, | |
1d498196 | 644 | sizeof(char), -1, chan->handle); |
8020ceb5 MD |
645 | /* |
646 | * We don't care about metadata buffer's records lost | |
647 | * count, because we always retry here. Report error if | |
648 | * we need to bail out after timeout or being | |
649 | * interrupted. | |
650 | */ | |
b5234c06 | 651 | waitret = wait_cond_interruptible_timeout( |
8020ceb5 MD |
652 | ({ |
653 | ret = chan->ops->event_reserve(&ctx, 0); | |
654 | ret != -ENOBUFS || !ret; | |
655 | }), | |
b5234c06 | 656 | LTTNG_METADATA_TIMEOUT_MSEC); |
b472cfc0 | 657 | if (waitret == -ETIMEDOUT || waitret == -EINTR || ret) { |
b5234c06 MD |
658 | DBG("LTTng: Failure to write metadata to buffers (%s)\n", |
659 | waitret == -EINTR ? "interrupted" : | |
8020ceb5 | 660 | (ret == -ENOBUFS ? "timeout" : "I/O error")); |
b5234c06 | 661 | if (waitret == -EINTR) |
8020ceb5 MD |
662 | ret = waitret; |
663 | goto end; | |
664 | } | |
665 | chan->ops->event_write(&ctx, &str[pos], reserve_len); | |
666 | chan->ops->event_commit(&ctx); | |
667 | } | |
668 | end: | |
b5234c06 | 669 | free(str); |
8020ceb5 MD |
670 | return ret; |
671 | } | |
672 | ||
673 | static | |
674 | int _ltt_field_statedump(struct ltt_session *session, | |
675 | const struct lttng_event_field *field) | |
676 | { | |
677 | int ret = 0; | |
678 | ||
679 | switch (field->type.atype) { | |
680 | case atype_integer: | |
681 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 682 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n", |
8020ceb5 MD |
683 | field->type.u.basic.integer.size, |
684 | field->type.u.basic.integer.alignment, | |
685 | field->type.u.basic.integer.signedness, | |
686 | (field->type.u.basic.integer.encoding == lttng_encode_none) | |
687 | ? "none" | |
688 | : (field->type.u.basic.integer.encoding == lttng_encode_UTF8) | |
689 | ? "UTF8" | |
690 | : "ASCII", | |
691 | field->type.u.basic.integer.base, | |
8a98a75d | 692 | #if (BYTE_ORDER == BIG_ENDIAN) |
403c40b4 MD |
693 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
694 | #else | |
695 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
696 | #endif | |
697 | field->name); | |
698 | break; | |
699 | case atype_float: | |
700 | ret = lttng_metadata_printf(session, | |
8a98a75d | 701 | " floating_point { exp_dig = %u; mant_dig = %u; align = %u;%s } _%s;\n", |
403c40b4 MD |
702 | field->type.u.basic._float.exp_dig, |
703 | field->type.u.basic._float.mant_dig, | |
704 | field->type.u.basic._float.alignment, | |
8a98a75d | 705 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
706 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
707 | #else | |
708 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
709 | #endif | |
710 | field->name); | |
711 | break; | |
712 | case atype_enum: | |
713 | ret = lttng_metadata_printf(session, | |
714 | " %s %s;\n", | |
715 | field->type.u.basic.enumeration.name, | |
716 | field->name); | |
717 | break; | |
718 | case atype_array: | |
719 | { | |
720 | const struct lttng_basic_type *elem_type; | |
721 | ||
722 | elem_type = &field->type.u.array.elem_type; | |
723 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 724 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n", |
8020ceb5 MD |
725 | elem_type->u.basic.integer.size, |
726 | elem_type->u.basic.integer.alignment, | |
727 | elem_type->u.basic.integer.signedness, | |
728 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
729 | ? "none" | |
730 | : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
731 | ? "UTF8" | |
732 | : "ASCII", | |
733 | elem_type->u.basic.integer.base, | |
8a98a75d | 734 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
735 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
736 | #else | |
737 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
738 | #endif | |
739 | field->name, field->type.u.array.length); | |
740 | break; | |
741 | } | |
742 | case atype_sequence: | |
743 | { | |
744 | const struct lttng_basic_type *elem_type; | |
745 | const struct lttng_basic_type *length_type; | |
746 | ||
747 | elem_type = &field->type.u.sequence.elem_type; | |
748 | length_type = &field->type.u.sequence.length_type; | |
749 | ret = lttng_metadata_printf(session, | |
750 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n", | |
751 | length_type->u.basic.integer.size, | |
752 | (unsigned int) length_type->u.basic.integer.alignment, | |
753 | length_type->u.basic.integer.signedness, | |
754 | (length_type->u.basic.integer.encoding == lttng_encode_none) | |
755 | ? "none" | |
756 | : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
757 | ? "UTF8" | |
758 | : "ASCII"), | |
759 | length_type->u.basic.integer.base, | |
8a98a75d | 760 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
761 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
762 | #else | |
763 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
764 | #endif | |
765 | field->name); | |
766 | if (ret) | |
767 | return ret; | |
768 | ||
769 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 770 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n", |
8020ceb5 MD |
771 | elem_type->u.basic.integer.size, |
772 | (unsigned int) elem_type->u.basic.integer.alignment, | |
773 | elem_type->u.basic.integer.signedness, | |
774 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
775 | ? "none" | |
776 | : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
777 | ? "UTF8" | |
778 | : "ASCII"), | |
779 | elem_type->u.basic.integer.base, | |
8a98a75d | 780 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
781 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
782 | #else | |
783 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
784 | #endif | |
785 | field->name, | |
786 | field->name); | |
787 | break; | |
788 | } | |
789 | ||
790 | case atype_string: | |
791 | /* Default encoding is UTF8 */ | |
792 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 793 | " string%s _%s;\n", |
8020ceb5 MD |
794 | field->type.u.basic.string.encoding == lttng_encode_ASCII ? |
795 | " { encoding = ASCII; }" : "", | |
796 | field->name); | |
797 | break; | |
798 | default: | |
799 | WARN_ON_ONCE(1); | |
800 | return -EINVAL; | |
801 | } | |
802 | return ret; | |
803 | } | |
804 | ||
805 | static | |
806 | int _ltt_context_metadata_statedump(struct ltt_session *session, | |
807 | struct lttng_ctx *ctx) | |
808 | { | |
809 | int ret = 0; | |
810 | int i; | |
811 | ||
812 | if (!ctx) | |
813 | return 0; | |
814 | for (i = 0; i < ctx->nr_fields; i++) { | |
815 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
816 | ||
817 | ret = _ltt_field_statedump(session, &field->event_field); | |
818 | if (ret) | |
819 | return ret; | |
820 | } | |
821 | return ret; | |
822 | } | |
823 | ||
824 | static | |
825 | int _ltt_fields_metadata_statedump(struct ltt_session *session, | |
826 | struct ltt_event *event) | |
827 | { | |
828 | const struct lttng_event_desc *desc = event->desc; | |
829 | int ret = 0; | |
830 | int i; | |
831 | ||
832 | for (i = 0; i < desc->nr_fields; i++) { | |
833 | const struct lttng_event_field *field = &desc->fields[i]; | |
834 | ||
835 | ret = _ltt_field_statedump(session, field); | |
836 | if (ret) | |
837 | return ret; | |
838 | } | |
839 | return ret; | |
840 | } | |
841 | ||
842 | static | |
843 | int _ltt_event_metadata_statedump(struct ltt_session *session, | |
844 | struct ltt_channel *chan, | |
845 | struct ltt_event *event) | |
846 | { | |
847 | int ret = 0; | |
848 | ||
b5234c06 | 849 | if (event->metadata_dumped || !CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
850 | return 0; |
851 | if (chan == session->metadata) | |
852 | return 0; | |
8165c8da MD |
853 | /* |
854 | * Don't print events for which probe load is pending. | |
855 | */ | |
856 | if (!event->desc) | |
857 | return 0; | |
8020ceb5 MD |
858 | |
859 | ret = lttng_metadata_printf(session, | |
860 | "event {\n" | |
7083f0fe | 861 | " name = \"%s\";\n" |
8020ceb5 MD |
862 | " id = %u;\n" |
863 | " stream_id = %u;\n", | |
864 | event->desc->name, | |
865 | event->id, | |
866 | event->chan->id); | |
867 | if (ret) | |
868 | goto end; | |
869 | ||
e6c12e3d MD |
870 | if (event->desc->loglevel) { |
871 | const struct tracepoint_loglevel_entry *ll_entry; | |
872 | ||
873 | ll_entry = *event->desc->loglevel; | |
874 | ret = lttng_metadata_printf(session, | |
875 | " loglevel.identifier = \"%s\";\n" | |
876 | " loglevel.value = %lld;\n", | |
877 | ll_entry->identifier, | |
878 | (long long) ll_entry->value); | |
879 | if (ret) | |
880 | goto end; | |
881 | } | |
882 | ||
8020ceb5 MD |
883 | if (event->ctx) { |
884 | ret = lttng_metadata_printf(session, | |
885 | " context := struct {\n"); | |
886 | if (ret) | |
887 | goto end; | |
888 | } | |
889 | ret = _ltt_context_metadata_statedump(session, event->ctx); | |
890 | if (ret) | |
891 | goto end; | |
892 | if (event->ctx) { | |
893 | ret = lttng_metadata_printf(session, | |
894 | " };\n"); | |
895 | if (ret) | |
896 | goto end; | |
897 | } | |
898 | ||
899 | ret = lttng_metadata_printf(session, | |
900 | " fields := struct {\n" | |
901 | ); | |
902 | if (ret) | |
903 | goto end; | |
904 | ||
905 | ret = _ltt_fields_metadata_statedump(session, event); | |
906 | if (ret) | |
907 | goto end; | |
908 | ||
909 | /* | |
910 | * LTTng space reservation can only reserve multiples of the | |
911 | * byte size. | |
912 | */ | |
913 | ret = lttng_metadata_printf(session, | |
914 | " };\n" | |
915 | "};\n\n"); | |
916 | if (ret) | |
917 | goto end; | |
918 | ||
919 | event->metadata_dumped = 1; | |
920 | end: | |
921 | return ret; | |
922 | ||
923 | } | |
924 | ||
925 | static | |
926 | int _ltt_channel_metadata_statedump(struct ltt_session *session, | |
927 | struct ltt_channel *chan) | |
928 | { | |
929 | int ret = 0; | |
930 | ||
b5234c06 | 931 | if (chan->metadata_dumped || !CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
932 | return 0; |
933 | if (chan == session->metadata) | |
934 | return 0; | |
935 | ||
936 | WARN_ON_ONCE(!chan->header_type); | |
937 | ret = lttng_metadata_printf(session, | |
938 | "stream {\n" | |
939 | " id = %u;\n" | |
940 | " event.header := %s;\n" | |
941 | " packet.context := struct packet_context;\n", | |
942 | chan->id, | |
943 | chan->header_type == 1 ? "struct event_header_compact" : | |
944 | "struct event_header_large"); | |
945 | if (ret) | |
946 | goto end; | |
947 | ||
948 | if (chan->ctx) { | |
949 | ret = lttng_metadata_printf(session, | |
950 | " event.context := struct {\n"); | |
951 | if (ret) | |
952 | goto end; | |
953 | } | |
954 | ret = _ltt_context_metadata_statedump(session, chan->ctx); | |
955 | if (ret) | |
956 | goto end; | |
957 | if (chan->ctx) { | |
958 | ret = lttng_metadata_printf(session, | |
959 | " };\n"); | |
960 | if (ret) | |
961 | goto end; | |
962 | } | |
963 | ||
964 | ret = lttng_metadata_printf(session, | |
965 | "};\n\n"); | |
966 | ||
967 | chan->metadata_dumped = 1; | |
968 | end: | |
969 | return ret; | |
970 | } | |
971 | ||
972 | static | |
973 | int _ltt_stream_packet_context_declare(struct ltt_session *session) | |
974 | { | |
975 | return lttng_metadata_printf(session, | |
976 | "struct packet_context {\n" | |
977 | " uint64_t timestamp_begin;\n" | |
978 | " uint64_t timestamp_end;\n" | |
979 | " uint32_t events_discarded;\n" | |
980 | " uint32_t content_size;\n" | |
981 | " uint32_t packet_size;\n" | |
982 | " uint32_t cpu_id;\n" | |
983 | "};\n\n" | |
984 | ); | |
985 | } | |
986 | ||
987 | /* | |
988 | * Compact header: | |
989 | * id: range: 0 - 30. | |
990 | * id 31 is reserved to indicate an extended header. | |
991 | * | |
992 | * Large header: | |
993 | * id: range: 0 - 65534. | |
994 | * id 65535 is reserved to indicate an extended header. | |
995 | */ | |
996 | static | |
997 | int _ltt_event_header_declare(struct ltt_session *session) | |
998 | { | |
999 | return lttng_metadata_printf(session, | |
1000 | "struct event_header_compact {\n" | |
1001 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
1002 | " variant <id> {\n" | |
1003 | " struct {\n" | |
1004 | " uint27_t timestamp;\n" | |
1005 | " } compact;\n" | |
1006 | " struct {\n" | |
1007 | " uint32_t id;\n" | |
1008 | " uint64_t timestamp;\n" | |
1009 | " } extended;\n" | |
1010 | " } v;\n" | |
1011 | "} align(%u);\n" | |
1012 | "\n" | |
1013 | "struct event_header_large {\n" | |
1014 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
1015 | " variant <id> {\n" | |
1016 | " struct {\n" | |
1017 | " uint32_t timestamp;\n" | |
1018 | " } compact;\n" | |
1019 | " struct {\n" | |
1020 | " uint32_t id;\n" | |
1021 | " uint64_t timestamp;\n" | |
1022 | " } extended;\n" | |
1023 | " } v;\n" | |
1024 | "} align(%u);\n\n", | |
1dbfff0c MD |
1025 | lttng_alignof(uint32_t) * CHAR_BIT, |
1026 | lttng_alignof(uint16_t) * CHAR_BIT | |
8020ceb5 MD |
1027 | ); |
1028 | } | |
1029 | ||
1030 | /* | |
1031 | * Output metadata into this session's metadata buffers. | |
1032 | */ | |
1033 | static | |
1034 | int _ltt_session_metadata_statedump(struct ltt_session *session) | |
1035 | { | |
b5234c06 MD |
1036 | unsigned char *uuid_c = session->uuid; |
1037 | char uuid_s[37]; | |
8020ceb5 MD |
1038 | struct ltt_channel *chan; |
1039 | struct ltt_event *event; | |
1040 | int ret = 0; | |
1041 | ||
b5234c06 | 1042 | if (!CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
1043 | return 0; |
1044 | if (session->metadata_dumped) | |
1045 | goto skip_session; | |
1046 | if (!session->metadata) { | |
b5234c06 | 1047 | DBG("LTTng: attempt to start tracing, but metadata channel is not found. Operation abort.\n"); |
8020ceb5 MD |
1048 | return -EPERM; |
1049 | } | |
1050 | ||
1051 | snprintf(uuid_s, sizeof(uuid_s), | |
1052 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", | |
1053 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
1054 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
1055 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
1056 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
1057 | ||
1058 | ret = lttng_metadata_printf(session, | |
1059 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" | |
1060 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
1061 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
1062 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
1063 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" | |
1064 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
1065 | "\n" | |
1066 | "trace {\n" | |
1067 | " major = %u;\n" | |
1068 | " minor = %u;\n" | |
1069 | " uuid = \"%s\";\n" | |
1070 | " byte_order = %s;\n" | |
1071 | " packet.header := struct {\n" | |
1072 | " uint32_t magic;\n" | |
1073 | " uint8_t uuid[16];\n" | |
1074 | " uint32_t stream_id;\n" | |
1075 | " };\n" | |
1076 | "};\n\n", | |
1dbfff0c MD |
1077 | lttng_alignof(uint8_t) * CHAR_BIT, |
1078 | lttng_alignof(uint16_t) * CHAR_BIT, | |
1079 | lttng_alignof(uint32_t) * CHAR_BIT, | |
1080 | lttng_alignof(uint64_t) * CHAR_BIT, | |
8020ceb5 MD |
1081 | CTF_VERSION_MAJOR, |
1082 | CTF_VERSION_MINOR, | |
1083 | uuid_s, | |
8a98a75d | 1084 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
1085 | "be" |
1086 | #else | |
1087 | "le" | |
1088 | #endif | |
1089 | ); | |
1090 | if (ret) | |
1091 | goto end; | |
1092 | ||
1093 | ret = _ltt_stream_packet_context_declare(session); | |
1094 | if (ret) | |
1095 | goto end; | |
1096 | ||
1097 | ret = _ltt_event_header_declare(session); | |
1098 | if (ret) | |
1099 | goto end; | |
1100 | ||
1101 | skip_session: | |
b5234c06 | 1102 | cds_list_for_each_entry(chan, &session->chan, list) { |
8020ceb5 MD |
1103 | ret = _ltt_channel_metadata_statedump(session, chan); |
1104 | if (ret) | |
1105 | goto end; | |
1106 | } | |
1107 | ||
b5234c06 | 1108 | cds_list_for_each_entry(event, &session->events, list) { |
8020ceb5 MD |
1109 | ret = _ltt_event_metadata_statedump(session, event->chan, event); |
1110 | if (ret) | |
1111 | goto end; | |
1112 | } | |
1113 | session->metadata_dumped = 1; | |
1114 | end: | |
1115 | return ret; | |
1116 | } | |
1117 | ||
003fedf4 | 1118 | void lttng_ust_events_exit(void) |
8020ceb5 MD |
1119 | { |
1120 | struct ltt_session *session, *tmpsession; | |
1121 | ||
b5234c06 | 1122 | cds_list_for_each_entry_safe(session, tmpsession, &sessions, list) |
8020ceb5 | 1123 | ltt_session_destroy(session); |
8020ceb5 | 1124 | } |