Add kernel and UST time namespace context
[lttng-tools.git] / src / bin / lttng-sessiond / trace-ust.c
1 /*
2 * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
3 * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
4 *
5 * SPDX-License-Identifier: GPL-2.0-only
6 *
7 */
8
9 #define _LGPL_SOURCE
10 #include <stdio.h>
11 #include <stdlib.h>
12 #include <string.h>
13 #include <unistd.h>
14 #include <inttypes.h>
15
16 #include <common/common.h>
17 #include <common/defaults.h>
18 #include <common/trace-chunk.h>
19 #include <common/utils.h>
20
21 #include "buffer-registry.h"
22 #include "trace-ust.h"
23 #include "utils.h"
24 #include "ust-app.h"
25 #include "agent.h"
26
27 /*
28 * Match function for the events hash table lookup.
29 *
30 * Matches by name only. Used by the disable command.
31 */
32 int trace_ust_ht_match_event_by_name(struct cds_lfht_node *node,
33 const void *_key)
34 {
35 struct ltt_ust_event *event;
36 const char *name;
37
38 assert(node);
39 assert(_key);
40
41 event = caa_container_of(node, struct ltt_ust_event, node.node);
42 name = _key;
43
44 /* Event name */
45 if (strncmp(event->attr.name, name, sizeof(event->attr.name)) != 0) {
46 goto no_match;
47 }
48
49 /* Match */
50 return 1;
51
52 no_match:
53 return 0;
54 }
55
56 /*
57 * Match function for the hash table lookup.
58 *
59 * It matches an ust event based on three attributes which are the event name,
60 * the filter bytecode and the loglevel.
61 */
62 int trace_ust_ht_match_event(struct cds_lfht_node *node, const void *_key)
63 {
64 struct ltt_ust_event *event;
65 const struct ltt_ust_ht_key *key;
66 int ev_loglevel_value;
67 int ll_match;
68
69 assert(node);
70 assert(_key);
71
72 event = caa_container_of(node, struct ltt_ust_event, node.node);
73 key = _key;
74 ev_loglevel_value = event->attr.loglevel;
75
76 /* Match the 4 elements of the key: name, filter, loglevel, exclusions. */
77
78 /* Event name */
79 if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) {
80 goto no_match;
81 }
82
83 /* Event loglevel value and type. */
84 ll_match = loglevels_match(event->attr.loglevel_type,
85 ev_loglevel_value, key->loglevel_type,
86 key->loglevel_value, LTTNG_UST_LOGLEVEL_ALL);
87
88 if (!ll_match) {
89 goto no_match;
90 }
91
92 /* Only one of the filters is NULL, fail. */
93 if ((key->filter && !event->filter) || (!key->filter && event->filter)) {
94 goto no_match;
95 }
96
97 if (key->filter && event->filter) {
98 /* Both filters exists, check length followed by the bytecode. */
99 if (event->filter->len != key->filter->len ||
100 memcmp(event->filter->data, key->filter->data,
101 event->filter->len) != 0) {
102 goto no_match;
103 }
104 }
105
106 /* If only one of the exclusions is NULL, fail. */
107 if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) {
108 goto no_match;
109 }
110
111 if (key->exclusion && event->exclusion) {
112 size_t i;
113
114 /* Check exclusion counts first. */
115 if (event->exclusion->count != key->exclusion->count) {
116 goto no_match;
117 }
118
119 /* Compare names individually. */
120 for (i = 0; i < event->exclusion->count; ++i) {
121 size_t j;
122 bool found = false;
123 const char *name_ev =
124 LTTNG_EVENT_EXCLUSION_NAME_AT(
125 event->exclusion, i);
126
127 /*
128 * Compare this exclusion name to all the key's
129 * exclusion names.
130 */
131 for (j = 0; j < key->exclusion->count; ++j) {
132 const char *name_key =
133 LTTNG_EVENT_EXCLUSION_NAME_AT(
134 key->exclusion, j);
135
136 if (!strncmp(name_ev, name_key,
137 LTTNG_SYMBOL_NAME_LEN)) {
138 /* Names match! */
139 found = true;
140 break;
141 }
142 }
143
144 /*
145 * If the current exclusion name was not found amongst
146 * the key's exclusion names, then there's no match.
147 */
148 if (!found) {
149 goto no_match;
150 }
151 }
152 }
153 /* Match. */
154 return 1;
155
156 no_match:
157 return 0;
158 }
159
160 /*
161 * Find the channel in the hashtable and return channel pointer. RCU read side
162 * lock MUST be acquired before calling this.
163 */
164 struct ltt_ust_channel *trace_ust_find_channel_by_name(struct lttng_ht *ht,
165 const char *name)
166 {
167 struct lttng_ht_node_str *node;
168 struct lttng_ht_iter iter;
169
170 /*
171 * If we receive an empty string for channel name, it means the
172 * default channel name is requested.
173 */
174 if (name[0] == '\0')
175 name = DEFAULT_CHANNEL_NAME;
176
177 lttng_ht_lookup(ht, (void *)name, &iter);
178 node = lttng_ht_iter_get_node_str(&iter);
179 if (node == NULL) {
180 goto error;
181 }
182
183 DBG2("Trace UST channel %s found by name", name);
184
185 return caa_container_of(node, struct ltt_ust_channel, node);
186
187 error:
188 DBG2("Trace UST channel %s not found by name", name);
189 return NULL;
190 }
191
192 /*
193 * Find the event in the hashtable and return event pointer. RCU read side lock
194 * MUST be acquired before calling this.
195 */
196 struct ltt_ust_event *trace_ust_find_event(struct lttng_ht *ht,
197 char *name, struct lttng_filter_bytecode *filter,
198 enum lttng_ust_loglevel_type loglevel_type, int loglevel_value,
199 struct lttng_event_exclusion *exclusion)
200 {
201 struct lttng_ht_node_str *node;
202 struct lttng_ht_iter iter;
203 struct ltt_ust_ht_key key;
204
205 assert(name);
206 assert(ht);
207
208 key.name = name;
209 key.filter = filter;
210 key.loglevel_type = loglevel_type;
211 key.loglevel_value = loglevel_value;
212 key.exclusion = exclusion;
213
214 cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed),
215 trace_ust_ht_match_event, &key, &iter.iter);
216 node = lttng_ht_iter_get_node_str(&iter);
217 if (node == NULL) {
218 goto error;
219 }
220
221 DBG2("Trace UST event %s found", key.name);
222
223 return caa_container_of(node, struct ltt_ust_event, node);
224
225 error:
226 DBG2("Trace UST event %s NOT found", key.name);
227 return NULL;
228 }
229
230 /*
231 * Lookup an agent in the session agents hash table by domain type and return
232 * the object if found else NULL.
233 *
234 * RCU read side lock must be acquired before calling and only released
235 * once the agent is no longer in scope or being used.
236 */
237 struct agent *trace_ust_find_agent(struct ltt_ust_session *session,
238 enum lttng_domain_type domain_type)
239 {
240 struct agent *agt = NULL;
241 struct lttng_ht_node_u64 *node;
242 struct lttng_ht_iter iter;
243 uint64_t key;
244
245 assert(session);
246
247 DBG3("Trace ust agent lookup for domain %d", domain_type);
248
249 key = domain_type;
250
251 lttng_ht_lookup(session->agents, &key, &iter);
252 node = lttng_ht_iter_get_node_u64(&iter);
253 if (!node) {
254 goto end;
255 }
256 agt = caa_container_of(node, struct agent, node);
257
258 end:
259 return agt;
260 }
261
262 /*
263 * Allocate and initialize a ust session data structure.
264 *
265 * Return pointer to structure or NULL.
266 */
267 struct ltt_ust_session *trace_ust_create_session(uint64_t session_id)
268 {
269 struct ltt_ust_session *lus;
270
271 /* Allocate a new ltt ust session */
272 lus = zmalloc(sizeof(struct ltt_ust_session));
273 if (lus == NULL) {
274 PERROR("create ust session zmalloc");
275 goto error_alloc;
276 }
277
278 /* Init data structure */
279 lus->id = session_id;
280 lus->active = 0;
281
282 /* Set default metadata channel attribute. */
283 lus->metadata_attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
284 lus->metadata_attr.subbuf_size = default_get_metadata_subbuf_size();
285 lus->metadata_attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
286 lus->metadata_attr.switch_timer_interval = DEFAULT_METADATA_SWITCH_TIMER;
287 lus->metadata_attr.read_timer_interval = DEFAULT_METADATA_READ_TIMER;
288 lus->metadata_attr.output = LTTNG_UST_MMAP;
289
290 /*
291 * Default buffer type. This can be changed through an enable channel
292 * requesting a different type. Note that this can only be changed once
293 * during the session lifetime which is at the first enable channel and
294 * only before start. The flag buffer_type_changed indicates the status.
295 */
296 lus->buffer_type = LTTNG_BUFFER_PER_UID;
297 /* Once set to 1, the buffer_type is immutable for the session. */
298 lus->buffer_type_changed = 0;
299 /* Init it in case it get used after allocation. */
300 CDS_INIT_LIST_HEAD(&lus->buffer_reg_uid_list);
301
302 /* Alloc UST global domain channels' HT */
303 lus->domain_global.channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
304 /* Alloc agent hash table. */
305 lus->agents = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
306
307 lus->tracker_vpid = process_attr_tracker_create();
308 if (!lus->tracker_vpid) {
309 goto error;
310 }
311 lus->tracker_vuid = process_attr_tracker_create();
312 if (!lus->tracker_vuid) {
313 goto error;
314 }
315 lus->tracker_vgid = process_attr_tracker_create();
316 if (!lus->tracker_vgid) {
317 goto error;
318 }
319 lus->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
320 if (lus->consumer == NULL) {
321 goto error;
322 }
323
324 DBG2("UST trace session create successful");
325
326 return lus;
327
328 error:
329 process_attr_tracker_destroy(lus->tracker_vpid);
330 process_attr_tracker_destroy(lus->tracker_vuid);
331 process_attr_tracker_destroy(lus->tracker_vgid);
332 ht_cleanup_push(lus->domain_global.channels);
333 ht_cleanup_push(lus->agents);
334 free(lus);
335 error_alloc:
336 return NULL;
337 }
338
339 /*
340 * Allocate and initialize a ust channel data structure.
341 *
342 * Return pointer to structure or NULL.
343 */
344 struct ltt_ust_channel *trace_ust_create_channel(struct lttng_channel *chan,
345 enum lttng_domain_type domain)
346 {
347 struct ltt_ust_channel *luc;
348
349 assert(chan);
350
351 luc = zmalloc(sizeof(struct ltt_ust_channel));
352 if (luc == NULL) {
353 PERROR("ltt_ust_channel zmalloc");
354 goto error;
355 }
356
357 luc->domain = domain;
358
359 /* Copy UST channel attributes */
360 luc->attr.overwrite = chan->attr.overwrite;
361 luc->attr.subbuf_size = chan->attr.subbuf_size;
362 luc->attr.num_subbuf = chan->attr.num_subbuf;
363 luc->attr.switch_timer_interval = chan->attr.switch_timer_interval;
364 luc->attr.read_timer_interval = chan->attr.read_timer_interval;
365 luc->attr.output = (enum lttng_ust_output) chan->attr.output;
366 luc->monitor_timer_interval = ((struct lttng_channel_extended *)
367 chan->attr.extended.ptr)->monitor_timer_interval;
368 luc->attr.u.s.blocking_timeout = ((struct lttng_channel_extended *)
369 chan->attr.extended.ptr)->blocking_timeout;
370
371 /* Translate to UST output enum */
372 switch (luc->attr.output) {
373 default:
374 luc->attr.output = LTTNG_UST_MMAP;
375 break;
376 }
377
378 /*
379 * If we receive an empty string for channel name, it means the
380 * default channel name is requested.
381 */
382 if (chan->name[0] == '\0') {
383 strncpy(luc->name, DEFAULT_CHANNEL_NAME, sizeof(luc->name));
384 } else {
385 /* Copy channel name */
386 strncpy(luc->name, chan->name, sizeof(luc->name));
387 }
388 luc->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
389
390 /* Init node */
391 lttng_ht_node_init_str(&luc->node, luc->name);
392 CDS_INIT_LIST_HEAD(&luc->ctx_list);
393
394 /* Alloc hash tables */
395 luc->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
396 luc->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
397
398 /* On-disk circular buffer parameters */
399 luc->tracefile_size = chan->attr.tracefile_size;
400 luc->tracefile_count = chan->attr.tracefile_count;
401
402 DBG2("Trace UST channel %s created", luc->name);
403
404 error:
405 return luc;
406 }
407
408 /*
409 * Validates an exclusion list.
410 *
411 * Returns 0 if valid, negative value if invalid.
412 */
413 static int validate_exclusion(struct lttng_event_exclusion *exclusion)
414 {
415 size_t i;
416 int ret = 0;
417
418 assert(exclusion);
419
420 for (i = 0; i < exclusion->count; ++i) {
421 size_t j;
422 const char *name_a =
423 LTTNG_EVENT_EXCLUSION_NAME_AT(exclusion, i);
424
425 for (j = 0; j < i; ++j) {
426 const char *name_b =
427 LTTNG_EVENT_EXCLUSION_NAME_AT(exclusion, j);
428
429 if (!strncmp(name_a, name_b, LTTNG_SYMBOL_NAME_LEN)) {
430 /* Match! */
431 ret = -1;
432 goto end;
433 }
434 }
435 }
436
437 end:
438 return ret;
439 }
440
441 /*
442 * Allocate and initialize a ust event. Set name and event type.
443 * We own filter_expression, filter, and exclusion.
444 *
445 * Return an lttng_error_code
446 */
447 enum lttng_error_code trace_ust_create_event(struct lttng_event *ev,
448 char *filter_expression,
449 struct lttng_filter_bytecode *filter,
450 struct lttng_event_exclusion *exclusion,
451 bool internal_event,
452 struct ltt_ust_event **ust_event)
453 {
454 struct ltt_ust_event *local_ust_event;
455 enum lttng_error_code ret = LTTNG_OK;
456
457 assert(ev);
458
459 if (exclusion && validate_exclusion(exclusion)) {
460 ret = LTTNG_ERR_INVALID;
461 goto error;
462 }
463
464 local_ust_event = zmalloc(sizeof(struct ltt_ust_event));
465 if (local_ust_event == NULL) {
466 PERROR("ust event zmalloc");
467 ret = LTTNG_ERR_NOMEM;
468 goto error;
469 }
470
471 local_ust_event->internal = internal_event;
472
473 switch (ev->type) {
474 case LTTNG_EVENT_PROBE:
475 local_ust_event->attr.instrumentation = LTTNG_UST_PROBE;
476 break;
477 case LTTNG_EVENT_FUNCTION:
478 local_ust_event->attr.instrumentation = LTTNG_UST_FUNCTION;
479 break;
480 case LTTNG_EVENT_FUNCTION_ENTRY:
481 local_ust_event->attr.instrumentation = LTTNG_UST_FUNCTION;
482 break;
483 case LTTNG_EVENT_TRACEPOINT:
484 local_ust_event->attr.instrumentation = LTTNG_UST_TRACEPOINT;
485 break;
486 default:
487 ERR("Unknown ust instrumentation type (%d)", ev->type);
488 ret = LTTNG_ERR_INVALID;
489 goto error_free_event;
490 }
491
492 /* Copy event name */
493 strncpy(local_ust_event->attr.name, ev->name, LTTNG_UST_SYM_NAME_LEN);
494 local_ust_event->attr.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
495
496 switch (ev->loglevel_type) {
497 case LTTNG_EVENT_LOGLEVEL_ALL:
498 local_ust_event->attr.loglevel_type = LTTNG_UST_LOGLEVEL_ALL;
499 local_ust_event->attr.loglevel = -1; /* Force to -1 */
500 break;
501 case LTTNG_EVENT_LOGLEVEL_RANGE:
502 local_ust_event->attr.loglevel_type = LTTNG_UST_LOGLEVEL_RANGE;
503 local_ust_event->attr.loglevel = ev->loglevel;
504 break;
505 case LTTNG_EVENT_LOGLEVEL_SINGLE:
506 local_ust_event->attr.loglevel_type = LTTNG_UST_LOGLEVEL_SINGLE;
507 local_ust_event->attr.loglevel = ev->loglevel;
508 break;
509 default:
510 ERR("Unknown ust loglevel type (%d)", ev->loglevel_type);
511 ret = LTTNG_ERR_INVALID;
512 goto error_free_event;
513 }
514
515 /* Same layout. */
516 local_ust_event->filter_expression = filter_expression;
517 local_ust_event->filter = filter;
518 local_ust_event->exclusion = exclusion;
519
520 /* Init node */
521 lttng_ht_node_init_str(&local_ust_event->node, local_ust_event->attr.name);
522
523 DBG2("Trace UST event %s, loglevel (%d,%d) created",
524 local_ust_event->attr.name, local_ust_event->attr.loglevel_type,
525 local_ust_event->attr.loglevel);
526
527 *ust_event = local_ust_event;
528
529 return ret;
530
531 error_free_event:
532 free(local_ust_event);
533 error:
534 free(filter_expression);
535 free(filter);
536 free(exclusion);
537 return ret;
538 }
539
540 static
541 int trace_ust_context_type_event_to_ust(
542 enum lttng_event_context_type type)
543 {
544 int utype;
545
546 switch (type) {
547 case LTTNG_EVENT_CONTEXT_VTID:
548 utype = LTTNG_UST_CONTEXT_VTID;
549 break;
550 case LTTNG_EVENT_CONTEXT_VPID:
551 utype = LTTNG_UST_CONTEXT_VPID;
552 break;
553 case LTTNG_EVENT_CONTEXT_PTHREAD_ID:
554 utype = LTTNG_UST_CONTEXT_PTHREAD_ID;
555 break;
556 case LTTNG_EVENT_CONTEXT_PROCNAME:
557 utype = LTTNG_UST_CONTEXT_PROCNAME;
558 break;
559 case LTTNG_EVENT_CONTEXT_IP:
560 utype = LTTNG_UST_CONTEXT_IP;
561 break;
562 case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER:
563 if (!ustctl_has_perf_counters()) {
564 utype = -1;
565 WARN("Perf counters not implemented in UST");
566 } else {
567 utype = LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER;
568 }
569 break;
570 case LTTNG_EVENT_CONTEXT_APP_CONTEXT:
571 utype = LTTNG_UST_CONTEXT_APP_CONTEXT;
572 break;
573 case LTTNG_EVENT_CONTEXT_CGROUP_NS:
574 utype = LTTNG_UST_CONTEXT_CGROUP_NS;
575 break;
576 case LTTNG_EVENT_CONTEXT_IPC_NS:
577 utype = LTTNG_UST_CONTEXT_IPC_NS;
578 break;
579 case LTTNG_EVENT_CONTEXT_MNT_NS:
580 utype = LTTNG_UST_CONTEXT_MNT_NS;
581 break;
582 case LTTNG_EVENT_CONTEXT_NET_NS:
583 utype = LTTNG_UST_CONTEXT_NET_NS;
584 break;
585 case LTTNG_EVENT_CONTEXT_PID_NS:
586 utype = LTTNG_UST_CONTEXT_PID_NS;
587 break;
588 case LTTNG_EVENT_CONTEXT_TIME_NS:
589 utype = LTTNG_UST_CONTEXT_TIME_NS;
590 break;
591 case LTTNG_EVENT_CONTEXT_USER_NS:
592 utype = LTTNG_UST_CONTEXT_USER_NS;
593 break;
594 case LTTNG_EVENT_CONTEXT_UTS_NS:
595 utype = LTTNG_UST_CONTEXT_UTS_NS;
596 break;
597 case LTTNG_EVENT_CONTEXT_VUID:
598 utype = LTTNG_UST_CONTEXT_VUID;
599 break;
600 case LTTNG_EVENT_CONTEXT_VEUID:
601 utype = LTTNG_UST_CONTEXT_VEUID;
602 break;
603 case LTTNG_EVENT_CONTEXT_VSUID:
604 utype = LTTNG_UST_CONTEXT_VSUID;
605 break;
606 case LTTNG_EVENT_CONTEXT_VGID:
607 utype = LTTNG_UST_CONTEXT_VGID;
608 break;
609 case LTTNG_EVENT_CONTEXT_VEGID:
610 utype = LTTNG_UST_CONTEXT_VEGID;
611 break;
612 case LTTNG_EVENT_CONTEXT_VSGID:
613 utype = LTTNG_UST_CONTEXT_VSGID;
614 break;
615 default:
616 utype = -1;
617 break;
618 }
619 return utype;
620 }
621
622 /*
623 * Return 1 if contexts match, 0 otherwise.
624 */
625 int trace_ust_match_context(const struct ltt_ust_context *uctx,
626 const struct lttng_event_context *ctx)
627 {
628 int utype;
629
630 utype = trace_ust_context_type_event_to_ust(ctx->ctx);
631 if (utype < 0) {
632 return 0;
633 }
634 if (uctx->ctx.ctx != utype) {
635 return 0;
636 }
637 switch (utype) {
638 case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER:
639 if (uctx->ctx.u.perf_counter.type
640 != ctx->u.perf_counter.type) {
641 return 0;
642 }
643 if (uctx->ctx.u.perf_counter.config
644 != ctx->u.perf_counter.config) {
645 return 0;
646 }
647 if (strncmp(uctx->ctx.u.perf_counter.name,
648 ctx->u.perf_counter.name,
649 LTTNG_UST_SYM_NAME_LEN)) {
650 return 0;
651 }
652 break;
653 case LTTNG_UST_CONTEXT_APP_CONTEXT:
654 assert(uctx->ctx.u.app_ctx.provider_name);
655 assert(uctx->ctx.u.app_ctx.ctx_name);
656 if (strcmp(uctx->ctx.u.app_ctx.provider_name,
657 ctx->u.app_ctx.provider_name) ||
658 strcmp(uctx->ctx.u.app_ctx.ctx_name,
659 ctx->u.app_ctx.ctx_name)) {
660 return 0;
661 }
662 default:
663 break;
664
665 }
666 return 1;
667 }
668
669 /*
670 * Allocate and initialize an UST context.
671 *
672 * Return pointer to structure or NULL.
673 */
674 struct ltt_ust_context *trace_ust_create_context(
675 const struct lttng_event_context *ctx)
676 {
677 struct ltt_ust_context *uctx = NULL;
678 int utype;
679
680 assert(ctx);
681
682 utype = trace_ust_context_type_event_to_ust(ctx->ctx);
683 if (utype < 0) {
684 ERR("Invalid UST context");
685 goto end;
686 }
687
688 uctx = zmalloc(sizeof(struct ltt_ust_context));
689 if (!uctx) {
690 PERROR("zmalloc ltt_ust_context");
691 goto end;
692 }
693
694 uctx->ctx.ctx = (enum lttng_ust_context_type) utype;
695 switch (utype) {
696 case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER:
697 uctx->ctx.u.perf_counter.type = ctx->u.perf_counter.type;
698 uctx->ctx.u.perf_counter.config = ctx->u.perf_counter.config;
699 strncpy(uctx->ctx.u.perf_counter.name, ctx->u.perf_counter.name,
700 LTTNG_UST_SYM_NAME_LEN);
701 uctx->ctx.u.perf_counter.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
702 break;
703 case LTTNG_UST_CONTEXT_APP_CONTEXT:
704 {
705 char *provider_name = NULL, *ctx_name = NULL;
706
707 provider_name = strdup(ctx->u.app_ctx.provider_name);
708 if (!provider_name) {
709 goto error;
710 }
711 uctx->ctx.u.app_ctx.provider_name = provider_name;
712
713 ctx_name = strdup(ctx->u.app_ctx.ctx_name);
714 if (!ctx_name) {
715 goto error;
716 }
717 uctx->ctx.u.app_ctx.ctx_name = ctx_name;
718 break;
719 }
720 default:
721 break;
722 }
723 lttng_ht_node_init_ulong(&uctx->node, (unsigned long) uctx->ctx.ctx);
724 end:
725 return uctx;
726 error:
727 trace_ust_destroy_context(uctx);
728 return NULL;
729 }
730
731 static void destroy_id_tracker_node_rcu(struct rcu_head *head)
732 {
733 struct ust_id_tracker_node *tracker_node = caa_container_of(
734 head, struct ust_id_tracker_node, node.head);
735 free(tracker_node);
736 }
737
738 static void destroy_id_tracker_node(struct ust_id_tracker_node *tracker_node)
739 {
740 call_rcu(&tracker_node->node.head, destroy_id_tracker_node_rcu);
741 }
742
743 static int init_id_tracker(struct ust_id_tracker *id_tracker)
744 {
745 int ret = LTTNG_OK;
746
747 id_tracker->ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
748 if (!id_tracker->ht) {
749 ret = LTTNG_ERR_NOMEM;
750 goto end;
751 }
752
753 end:
754 return ret;
755 }
756
757 /*
758 * Teardown id tracker content, but don't free id_tracker object.
759 */
760 static void fini_id_tracker(struct ust_id_tracker *id_tracker)
761 {
762 struct ust_id_tracker_node *tracker_node;
763 struct lttng_ht_iter iter;
764
765 if (!id_tracker->ht) {
766 return;
767 }
768 rcu_read_lock();
769 cds_lfht_for_each_entry (id_tracker->ht->ht, &iter.iter, tracker_node,
770 node.node) {
771 int ret = lttng_ht_del(id_tracker->ht, &iter);
772
773 assert(!ret);
774 destroy_id_tracker_node(tracker_node);
775 }
776 rcu_read_unlock();
777 ht_cleanup_push(id_tracker->ht);
778 id_tracker->ht = NULL;
779 }
780
781 static struct ust_id_tracker_node *id_tracker_lookup(
782 struct ust_id_tracker *id_tracker,
783 int id,
784 struct lttng_ht_iter *iter)
785 {
786 unsigned long _id = (unsigned long) id;
787 struct lttng_ht_node_ulong *node;
788
789 lttng_ht_lookup(id_tracker->ht, (void *) _id, iter);
790 node = lttng_ht_iter_get_node_ulong(iter);
791 if (node) {
792 return caa_container_of(node, struct ust_id_tracker_node, node);
793 } else {
794 return NULL;
795 }
796 }
797
798 static int id_tracker_add_id(struct ust_id_tracker *id_tracker, int id)
799 {
800 int retval = LTTNG_OK;
801 struct ust_id_tracker_node *tracker_node;
802 struct lttng_ht_iter iter;
803
804 if (id < 0) {
805 retval = LTTNG_ERR_INVALID;
806 goto end;
807 }
808 tracker_node = id_tracker_lookup(id_tracker, id, &iter);
809 if (tracker_node) {
810 /* Already exists. */
811 retval = LTTNG_ERR_PROCESS_ATTR_EXISTS;
812 goto end;
813 }
814 tracker_node = zmalloc(sizeof(*tracker_node));
815 if (!tracker_node) {
816 retval = LTTNG_ERR_NOMEM;
817 goto end;
818 }
819 lttng_ht_node_init_ulong(&tracker_node->node, (unsigned long) id);
820 lttng_ht_add_unique_ulong(id_tracker->ht, &tracker_node->node);
821 end:
822 return retval;
823 }
824
825 static int id_tracker_del_id(struct ust_id_tracker *id_tracker, int id)
826 {
827 int retval = LTTNG_OK, ret;
828 struct ust_id_tracker_node *tracker_node;
829 struct lttng_ht_iter iter;
830
831 if (id < 0) {
832 retval = LTTNG_ERR_INVALID;
833 goto end;
834 }
835 tracker_node = id_tracker_lookup(id_tracker, id, &iter);
836 if (!tracker_node) {
837 /* Not found */
838 retval = LTTNG_ERR_PROCESS_ATTR_MISSING;
839 goto end;
840 }
841 ret = lttng_ht_del(id_tracker->ht, &iter);
842 assert(!ret);
843
844 destroy_id_tracker_node(tracker_node);
845 end:
846 return retval;
847 }
848
849 static struct ust_id_tracker *get_id_tracker(struct ltt_ust_session *session,
850 enum lttng_process_attr process_attr)
851 {
852 switch (process_attr) {
853 case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID:
854 return &session->vpid_tracker;
855 case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID:
856 return &session->vuid_tracker;
857 case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID:
858 return &session->vgid_tracker;
859 default:
860 return NULL;
861 }
862 }
863
864 static struct process_attr_tracker *_trace_ust_get_process_attr_tracker(
865 struct ltt_ust_session *session,
866 enum lttng_process_attr process_attr)
867 {
868 switch (process_attr) {
869 case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID:
870 return session->tracker_vpid;
871 case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID:
872 return session->tracker_vuid;
873 case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID:
874 return session->tracker_vgid;
875 default:
876 return NULL;
877 }
878 }
879
880 const struct process_attr_tracker *trace_ust_get_process_attr_tracker(
881 struct ltt_ust_session *session,
882 enum lttng_process_attr process_attr)
883 {
884 return (const struct process_attr_tracker *)
885 _trace_ust_get_process_attr_tracker(
886 session, process_attr);
887 }
888
889 /*
890 * The session lock is held when calling this function.
891 */
892 int trace_ust_id_tracker_lookup(enum lttng_process_attr process_attr,
893 struct ltt_ust_session *session,
894 int id)
895 {
896 struct lttng_ht_iter iter;
897 struct ust_id_tracker *id_tracker;
898
899 id_tracker = get_id_tracker(session, process_attr);
900 if (!id_tracker) {
901 abort();
902 }
903 if (!id_tracker->ht) {
904 return 1;
905 }
906 if (id_tracker_lookup(id_tracker, id, &iter)) {
907 return 1;
908 }
909 return 0;
910 }
911
912 /*
913 * Called with the session lock held.
914 */
915 enum lttng_error_code trace_ust_process_attr_tracker_set_tracking_policy(
916 struct ltt_ust_session *session,
917 enum lttng_process_attr process_attr,
918 enum lttng_tracking_policy policy)
919 {
920 int ret;
921 enum lttng_error_code ret_code = LTTNG_OK;
922 struct ust_id_tracker *id_tracker =
923 get_id_tracker(session, process_attr);
924 struct process_attr_tracker *tracker =
925 _trace_ust_get_process_attr_tracker(
926 session, process_attr);
927 bool should_update_apps = false;
928 enum lttng_tracking_policy previous_policy;
929
930 if (!tracker) {
931 ret_code = LTTNG_ERR_INVALID;
932 goto end;
933 }
934
935 previous_policy = process_attr_tracker_get_tracking_policy(tracker);
936 ret = process_attr_tracker_set_tracking_policy(tracker, policy);
937 if (ret) {
938 ret_code = LTTNG_ERR_UNK;
939 goto end;
940 }
941
942 if (previous_policy == policy) {
943 goto end;
944 }
945
946 switch (policy) {
947 case LTTNG_TRACKING_POLICY_INCLUDE_ALL:
948 /* Track all values: destroy tracker if exists. */
949 if (id_tracker->ht) {
950 fini_id_tracker(id_tracker);
951 /* Ensure all apps have session. */
952 should_update_apps = true;
953 }
954 break;
955 case LTTNG_TRACKING_POLICY_EXCLUDE_ALL:
956 case LTTNG_TRACKING_POLICY_INCLUDE_SET:
957 /* fall-through. */
958 fini_id_tracker(id_tracker);
959 ret_code = init_id_tracker(id_tracker);
960 if (ret_code != LTTNG_OK) {
961 ERR("Error initializing ID tracker");
962 goto end;
963 }
964 /* Remove all apps from session. */
965 should_update_apps = true;
966 break;
967 default:
968 abort();
969 }
970 if (should_update_apps && session->active) {
971 ust_app_global_update_all(session);
972 }
973 end:
974 return ret_code;
975 }
976
977 /* Called with the session lock held. */
978 enum lttng_error_code trace_ust_process_attr_tracker_inclusion_set_add_value(
979 struct ltt_ust_session *session,
980 enum lttng_process_attr process_attr,
981 const struct process_attr_value *value)
982 {
983 enum lttng_error_code ret_code = LTTNG_OK;
984 bool should_update_apps = false;
985 struct ust_id_tracker *id_tracker =
986 get_id_tracker(session, process_attr);
987 struct process_attr_tracker *tracker;
988 int integral_value;
989 enum process_attr_tracker_status status;
990 struct ust_app *app;
991
992 /*
993 * Convert process attribute tracker value to the integral
994 * representation required by the kern-ctl API.
995 */
996 switch (process_attr) {
997 case LTTNG_PROCESS_ATTR_PROCESS_ID:
998 case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID:
999 integral_value = (int) value->value.pid;
1000 break;
1001 case LTTNG_PROCESS_ATTR_USER_ID:
1002 case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID:
1003 if (value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_USER_NAME) {
1004 uid_t uid;
1005
1006 ret_code = utils_user_id_from_name(
1007 value->value.user_name, &uid);
1008 if (ret_code != LTTNG_OK) {
1009 goto end;
1010 }
1011 integral_value = (int) uid;
1012 } else {
1013 integral_value = (int) value->value.uid;
1014 }
1015 break;
1016 case LTTNG_PROCESS_ATTR_GROUP_ID:
1017 case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID:
1018 if (value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_GROUP_NAME) {
1019 gid_t gid;
1020
1021 ret_code = utils_group_id_from_name(
1022 value->value.group_name, &gid);
1023 if (ret_code != LTTNG_OK) {
1024 goto end;
1025 }
1026 integral_value = (int) gid;
1027 } else {
1028 integral_value = (int) value->value.gid;
1029 }
1030 break;
1031 default:
1032 ret_code = LTTNG_ERR_INVALID;
1033 goto end;
1034 }
1035
1036 tracker = _trace_ust_get_process_attr_tracker(session, process_attr);
1037 if (!tracker) {
1038 ret_code = LTTNG_ERR_INVALID;
1039 goto end;
1040 }
1041
1042 status = process_attr_tracker_inclusion_set_add_value(tracker, value);
1043 if (status != PROCESS_ATTR_TRACKER_STATUS_OK) {
1044 switch (status) {
1045 case PROCESS_ATTR_TRACKER_STATUS_EXISTS:
1046 ret_code = LTTNG_ERR_PROCESS_ATTR_EXISTS;
1047 break;
1048 case PROCESS_ATTR_TRACKER_STATUS_INVALID_TRACKING_POLICY:
1049 ret_code = LTTNG_ERR_PROCESS_ATTR_TRACKER_INVALID_TRACKING_POLICY;
1050 break;
1051 case PROCESS_ATTR_TRACKER_STATUS_ERROR:
1052 default:
1053 ret_code = LTTNG_ERR_UNK;
1054 break;
1055 }
1056 goto end;
1057 }
1058
1059 DBG("User space track %s %d for session id %" PRIu64,
1060 lttng_process_attr_to_string(process_attr),
1061 integral_value, session->id);
1062
1063 ret_code = id_tracker_add_id(id_tracker, integral_value);
1064 if (ret_code != LTTNG_OK) {
1065 goto end;
1066 }
1067 /* Add session to application */
1068 switch (process_attr) {
1069 case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID:
1070 app = ust_app_find_by_pid(integral_value);
1071 if (app) {
1072 should_update_apps = true;
1073 }
1074 break;
1075 default:
1076 should_update_apps = true;
1077 break;
1078 }
1079 if (should_update_apps && session->active) {
1080 ust_app_global_update_all(session);
1081 }
1082 end:
1083 return ret_code;
1084 }
1085
1086 /* Called with the session lock held. */
1087 enum lttng_error_code trace_ust_process_attr_tracker_inclusion_set_remove_value(
1088 struct ltt_ust_session *session,
1089 enum lttng_process_attr process_attr,
1090 const struct process_attr_value *value)
1091 {
1092 enum lttng_error_code ret_code = LTTNG_OK;
1093 bool should_update_apps = false;
1094 struct ust_id_tracker *id_tracker =
1095 get_id_tracker(session, process_attr);
1096 struct process_attr_tracker *tracker;
1097 int integral_value;
1098 enum process_attr_tracker_status status;
1099 struct ust_app *app;
1100
1101 /*
1102 * Convert process attribute tracker value to the integral
1103 * representation required by the kern-ctl API.
1104 */
1105 switch (process_attr) {
1106 case LTTNG_PROCESS_ATTR_PROCESS_ID:
1107 case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID:
1108 integral_value = (int) value->value.pid;
1109 break;
1110 case LTTNG_PROCESS_ATTR_USER_ID:
1111 case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID:
1112 if (value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_USER_NAME) {
1113 uid_t uid;
1114
1115 ret_code = utils_user_id_from_name(
1116 value->value.user_name, &uid);
1117 if (ret_code != LTTNG_OK) {
1118 goto end;
1119 }
1120 integral_value = (int) uid;
1121 } else {
1122 integral_value = (int) value->value.uid;
1123 }
1124 break;
1125 case LTTNG_PROCESS_ATTR_GROUP_ID:
1126 case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID:
1127 if (value->type == LTTNG_PROCESS_ATTR_VALUE_TYPE_GROUP_NAME) {
1128 gid_t gid;
1129
1130 ret_code = utils_group_id_from_name(
1131 value->value.group_name, &gid);
1132 if (ret_code != LTTNG_OK) {
1133 goto end;
1134 }
1135 integral_value = (int) gid;
1136 } else {
1137 integral_value = (int) value->value.gid;
1138 }
1139 break;
1140 default:
1141 ret_code = LTTNG_ERR_INVALID;
1142 goto end;
1143 }
1144
1145 tracker = _trace_ust_get_process_attr_tracker(session, process_attr);
1146 if (!tracker) {
1147 ret_code = LTTNG_ERR_INVALID;
1148 goto end;
1149 }
1150
1151 status = process_attr_tracker_inclusion_set_remove_value(
1152 tracker, value);
1153 if (status != PROCESS_ATTR_TRACKER_STATUS_OK) {
1154 switch (status) {
1155 case PROCESS_ATTR_TRACKER_STATUS_MISSING:
1156 ret_code = LTTNG_ERR_PROCESS_ATTR_MISSING;
1157 break;
1158 case PROCESS_ATTR_TRACKER_STATUS_INVALID_TRACKING_POLICY:
1159 ret_code = LTTNG_ERR_PROCESS_ATTR_TRACKER_INVALID_TRACKING_POLICY;
1160 break;
1161 case PROCESS_ATTR_TRACKER_STATUS_ERROR:
1162 default:
1163 ret_code = LTTNG_ERR_UNK;
1164 break;
1165 }
1166 goto end;
1167 }
1168
1169 DBG("User space untrack %s %d for session id %" PRIu64,
1170 lttng_process_attr_to_string(process_attr),
1171 integral_value, session->id);
1172
1173 ret_code = id_tracker_del_id(id_tracker, integral_value);
1174 if (ret_code != LTTNG_OK) {
1175 goto end;
1176 }
1177 /* Add session to application */
1178 switch (process_attr) {
1179 case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID:
1180 app = ust_app_find_by_pid(integral_value);
1181 if (app) {
1182 should_update_apps = true;
1183 }
1184 break;
1185 default:
1186 should_update_apps = true;
1187 break;
1188 }
1189 if (should_update_apps && session->active) {
1190 ust_app_global_update_all(session);
1191 }
1192 end:
1193 return ret_code;
1194 }
1195
1196 /*
1197 * RCU safe free context structure.
1198 */
1199 static void destroy_context_rcu(struct rcu_head *head)
1200 {
1201 struct lttng_ht_node_ulong *node =
1202 caa_container_of(head, struct lttng_ht_node_ulong, head);
1203 struct ltt_ust_context *ctx =
1204 caa_container_of(node, struct ltt_ust_context, node);
1205
1206 trace_ust_destroy_context(ctx);
1207 }
1208
1209 /*
1210 * Cleanup UST context hash table.
1211 */
1212 static void destroy_contexts(struct lttng_ht *ht)
1213 {
1214 int ret;
1215 struct lttng_ht_node_ulong *node;
1216 struct lttng_ht_iter iter;
1217 struct ltt_ust_context *ctx;
1218
1219 assert(ht);
1220
1221 rcu_read_lock();
1222 cds_lfht_for_each_entry(ht->ht, &iter.iter, node, node) {
1223 /* Remove from ordered list. */
1224 ctx = caa_container_of(node, struct ltt_ust_context, node);
1225 cds_list_del(&ctx->list);
1226 /* Remove from channel's hash table. */
1227 ret = lttng_ht_del(ht, &iter);
1228 if (!ret) {
1229 call_rcu(&node->head, destroy_context_rcu);
1230 }
1231 }
1232 rcu_read_unlock();
1233
1234 ht_cleanup_push(ht);
1235 }
1236
1237 /*
1238 * Cleanup ust event structure.
1239 */
1240 void trace_ust_destroy_event(struct ltt_ust_event *event)
1241 {
1242 assert(event);
1243
1244 DBG2("Trace destroy UST event %s", event->attr.name);
1245 free(event->filter_expression);
1246 free(event->filter);
1247 free(event->exclusion);
1248 free(event);
1249 }
1250
1251 /*
1252 * Cleanup ust context structure.
1253 */
1254 void trace_ust_destroy_context(struct ltt_ust_context *ctx)
1255 {
1256 assert(ctx);
1257
1258 if (ctx->ctx.ctx == LTTNG_UST_CONTEXT_APP_CONTEXT) {
1259 free(ctx->ctx.u.app_ctx.provider_name);
1260 free(ctx->ctx.u.app_ctx.ctx_name);
1261 }
1262 free(ctx);
1263 }
1264
1265 /*
1266 * URCU intermediate call to complete destroy event.
1267 */
1268 static void destroy_event_rcu(struct rcu_head *head)
1269 {
1270 struct lttng_ht_node_str *node =
1271 caa_container_of(head, struct lttng_ht_node_str, head);
1272 struct ltt_ust_event *event =
1273 caa_container_of(node, struct ltt_ust_event, node);
1274
1275 trace_ust_destroy_event(event);
1276 }
1277
1278 /*
1279 * Cleanup UST events hashtable.
1280 */
1281 static void destroy_events(struct lttng_ht *events)
1282 {
1283 int ret;
1284 struct lttng_ht_node_str *node;
1285 struct lttng_ht_iter iter;
1286
1287 assert(events);
1288
1289 rcu_read_lock();
1290 cds_lfht_for_each_entry(events->ht, &iter.iter, node, node) {
1291 ret = lttng_ht_del(events, &iter);
1292 assert(!ret);
1293 call_rcu(&node->head, destroy_event_rcu);
1294 }
1295 rcu_read_unlock();
1296
1297 ht_cleanup_push(events);
1298 }
1299
1300 /*
1301 * Cleanup ust channel structure.
1302 *
1303 * Should _NOT_ be called with RCU read lock held.
1304 */
1305 static void _trace_ust_destroy_channel(struct ltt_ust_channel *channel)
1306 {
1307 assert(channel);
1308
1309 DBG2("Trace destroy UST channel %s", channel->name);
1310
1311 free(channel);
1312 }
1313
1314 /*
1315 * URCU intermediate call to complete destroy channel.
1316 */
1317 static void destroy_channel_rcu(struct rcu_head *head)
1318 {
1319 struct lttng_ht_node_str *node =
1320 caa_container_of(head, struct lttng_ht_node_str, head);
1321 struct ltt_ust_channel *channel =
1322 caa_container_of(node, struct ltt_ust_channel, node);
1323
1324 _trace_ust_destroy_channel(channel);
1325 }
1326
1327 void trace_ust_destroy_channel(struct ltt_ust_channel *channel)
1328 {
1329 /* Destroying all events of the channel */
1330 destroy_events(channel->events);
1331 /* Destroying all context of the channel */
1332 destroy_contexts(channel->ctx);
1333
1334 call_rcu(&channel->node.head, destroy_channel_rcu);
1335 }
1336
1337 /*
1338 * Remove an UST channel from a channel HT.
1339 */
1340 void trace_ust_delete_channel(struct lttng_ht *ht,
1341 struct ltt_ust_channel *channel)
1342 {
1343 int ret;
1344 struct lttng_ht_iter iter;
1345
1346 assert(ht);
1347 assert(channel);
1348
1349 iter.iter.node = &channel->node.node;
1350 ret = lttng_ht_del(ht, &iter);
1351 assert(!ret);
1352 }
1353
1354 /*
1355 * Iterate over a hash table containing channels and cleanup safely.
1356 */
1357 static void destroy_channels(struct lttng_ht *channels)
1358 {
1359 struct lttng_ht_node_str *node;
1360 struct lttng_ht_iter iter;
1361
1362 assert(channels);
1363
1364 rcu_read_lock();
1365 cds_lfht_for_each_entry(channels->ht, &iter.iter, node, node) {
1366 struct ltt_ust_channel *chan =
1367 caa_container_of(node, struct ltt_ust_channel, node);
1368
1369 trace_ust_delete_channel(channels, chan);
1370 trace_ust_destroy_channel(chan);
1371 }
1372 rcu_read_unlock();
1373
1374 ht_cleanup_push(channels);
1375 }
1376
1377 /*
1378 * Cleanup UST global domain.
1379 */
1380 static void destroy_domain_global(struct ltt_ust_domain_global *dom)
1381 {
1382 assert(dom);
1383
1384 destroy_channels(dom->channels);
1385 }
1386
1387 /*
1388 * Cleanup ust session structure, keeping data required by
1389 * destroy notifier.
1390 *
1391 * Should *NOT* be called with RCU read-side lock held.
1392 */
1393 void trace_ust_destroy_session(struct ltt_ust_session *session)
1394 {
1395 struct agent *agt;
1396 struct buffer_reg_uid *reg, *sreg;
1397 struct lttng_ht_iter iter;
1398
1399 assert(session);
1400
1401 DBG2("Trace UST destroy session %" PRIu64, session->id);
1402
1403 /* Cleaning up UST domain */
1404 destroy_domain_global(&session->domain_global);
1405
1406 rcu_read_lock();
1407 cds_lfht_for_each_entry(session->agents->ht, &iter.iter, agt, node.node) {
1408 int ret = lttng_ht_del(session->agents, &iter);
1409
1410 assert(!ret);
1411 agent_destroy(agt);
1412 }
1413 rcu_read_unlock();
1414
1415 ht_cleanup_push(session->agents);
1416
1417 /* Cleanup UID buffer registry object(s). */
1418 cds_list_for_each_entry_safe(reg, sreg, &session->buffer_reg_uid_list,
1419 lnode) {
1420 cds_list_del(&reg->lnode);
1421 buffer_reg_uid_remove(reg);
1422 buffer_reg_uid_destroy(reg, session->consumer);
1423 }
1424
1425 process_attr_tracker_destroy(session->tracker_vpid);
1426 process_attr_tracker_destroy(session->tracker_vuid);
1427 process_attr_tracker_destroy(session->tracker_vgid);
1428
1429 fini_id_tracker(&session->vpid_tracker);
1430 fini_id_tracker(&session->vuid_tracker);
1431 fini_id_tracker(&session->vgid_tracker);
1432 lttng_trace_chunk_put(session->current_trace_chunk);
1433 }
1434
1435 /* Free elements needed by destroy notifiers. */
1436 void trace_ust_free_session(struct ltt_ust_session *session)
1437 {
1438 consumer_output_put(session->consumer);
1439 free(session);
1440 }
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