Fix: add missing rcu read side lock
[lttng-tools.git] / src / bin / lttng-sessiond / trace-ust.c
CommitLineData
97ee3a89
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1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
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AM
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License, version 2 only,
6 * as published by the Free Software Foundation.
97ee3a89 7 *
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8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
97ee3a89 12 *
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13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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16 */
17
18#define _GNU_SOURCE
19#include <stdio.h>
20#include <stdlib.h>
21#include <string.h>
22#include <unistd.h>
23
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24#include <common/common.h>
25#include <common/defaults.h>
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26
27#include "trace-ust.h"
28
025faf73
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29/*
30 * Match function for the events hash table lookup.
31 *
32 * Matches by name only. Used by the disable command.
33 */
18eace3b
DG
34int trace_ust_ht_match_event_by_name(struct cds_lfht_node *node,
35 const void *_key)
36{
37 struct ltt_ust_event *event;
38 const char *name;
39
40 assert(node);
41 assert(_key);
42
43 event = caa_container_of(node, struct ltt_ust_event, node.node);
44 name = _key;
45
46 /* Event name */
47 if (strncmp(event->attr.name, name, sizeof(event->attr.name)) != 0) {
48 goto no_match;
49 }
50
025faf73 51 /* Match */
18eace3b
DG
52 return 1;
53
54no_match:
55 return 0;
56}
57
025faf73
DG
58/*
59 * Match function for the hash table lookup.
60 *
61 * It matches an ust event based on three attributes which are the event name,
62 * the filter bytecode and the loglevel.
63 */
18eace3b
DG
64int trace_ust_ht_match_event(struct cds_lfht_node *node, const void *_key)
65{
66 struct ltt_ust_event *event;
67 const struct ltt_ust_ht_key *key;
68
69 assert(node);
70 assert(_key);
71
72 event = caa_container_of(node, struct ltt_ust_event, node.node);
73 key = _key;
74
75 /* Match the 3 elements of the key: name, filter and loglevel. */
76
77 /* Event name */
78 if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) {
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79 goto no_match;
80 }
81
82 /* Event loglevel. */
83 if (event->attr.loglevel != key->loglevel) {
025faf73
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84 if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL
85 && key->loglevel == 0 && event->attr.loglevel == -1) {
18eace3b 86 /*
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87 * Match is accepted. This is because on event creation, the
88 * loglevel is set to -1 if the event loglevel type is ALL so 0 and
89 * -1 are accepted for this loglevel type since 0 is the one set by
90 * the API when receiving an enable event.
18eace3b
DG
91 */
92 } else {
18eace3b
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93 goto no_match;
94 }
95 }
96
97 /* Only one of the filters is NULL, fail. */
98 if ((key->filter && !event->filter) || (!key->filter && event->filter)) {
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99 goto no_match;
100 }
101
025faf73
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102 if (key->filter && event->filter) {
103 /* Both filters exists, check length followed by the bytecode. */
104 if (event->filter->len != key->filter->len ||
105 memcmp(event->filter->data, key->filter->data,
106 event->filter->len) != 0) {
107 goto no_match;
108 }
18eace3b
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109 }
110
025faf73
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111 /* Match. */
112 return 1;
18eace3b
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113
114no_match:
115 return 0;
18eace3b
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116}
117
0177d773 118/*
f6a9efaa 119 * Find the channel in the hashtable.
0177d773 120 */
bec39940 121struct ltt_ust_channel *trace_ust_find_channel_by_name(struct lttng_ht *ht,
f6a9efaa 122 char *name)
0177d773 123{
bec39940
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124 struct lttng_ht_node_str *node;
125 struct lttng_ht_iter iter;
0177d773 126
f6a9efaa 127 rcu_read_lock();
bec39940
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128 lttng_ht_lookup(ht, (void *)name, &iter);
129 node = lttng_ht_iter_get_node_str(&iter);
f6a9efaa
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130 if (node == NULL) {
131 rcu_read_unlock();
44d3bd01
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132 goto error;
133 }
f6a9efaa 134 rcu_read_unlock();
44d3bd01 135
f6a9efaa 136 DBG2("Trace UST channel %s found by name", name);
0177d773 137
f6a9efaa 138 return caa_container_of(node, struct ltt_ust_channel, node);
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139
140error:
f6a9efaa 141 DBG2("Trace UST channel %s not found by name", name);
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142 return NULL;
143}
144
145/*
f6a9efaa 146 * Find the event in the hashtable.
97ee3a89 147 */
18eace3b
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148struct ltt_ust_event *trace_ust_find_event(struct lttng_ht *ht,
149 char *name, struct lttng_filter_bytecode *filter, int loglevel)
97ee3a89 150{
bec39940
DG
151 struct lttng_ht_node_str *node;
152 struct lttng_ht_iter iter;
18eace3b 153 struct ltt_ust_ht_key key;
97ee3a89 154
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DG
155 assert(name);
156 assert(ht);
157
158 key.name = name;
159 key.filter = filter;
160 key.loglevel = loglevel;
161
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162 cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed),
163 trace_ust_ht_match_event, &key, &iter.iter);
bec39940 164 node = lttng_ht_iter_get_node_str(&iter);
f6a9efaa 165 if (node == NULL) {
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166 goto error;
167 }
168
18eace3b 169 DBG2("Trace UST event %s found", key.name);
f6a9efaa
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170
171 return caa_container_of(node, struct ltt_ust_event, node);
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172
173error:
18eace3b 174 DBG2("Trace UST event %s NOT found", key.name);
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175 return NULL;
176}
177
178/*
179 * Allocate and initialize a ust session data structure.
180 *
181 * Return pointer to structure or NULL.
182 */
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183struct ltt_ust_session *trace_ust_create_session(char *path,
184 unsigned int session_id, struct lttng_domain *domain)
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185{
186 struct ltt_ust_session *lus;
187
188 /* Allocate a new ltt ust session */
ba7f0ae5 189 lus = zmalloc(sizeof(struct ltt_ust_session));
97ee3a89 190 if (lus == NULL) {
ba7f0ae5 191 PERROR("create ust session zmalloc");
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DG
192 goto error;
193 }
194
195 /* Init data structure */
a991f516 196 lus->id = session_id;
36dc12cc 197 lus->start_trace = 0;
97ee3a89 198
f6a9efaa 199 /* Alloc UST domain hash tables */
bec39940
DG
200 lus->domain_pid = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
201 lus->domain_exec = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
f6a9efaa
DG
202
203 /* Alloc UST global domain channels' HT */
bec39940 204 lus->domain_global.channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
44d3bd01 205
00e2e675
DG
206 lus->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
207 if (lus->consumer == NULL) {
09a90bcd 208 goto error_consumer;
00e2e675
DG
209 }
210
211 /*
212 * The tmp_consumer stays NULL until a set_consumer_uri command is
213 * executed. At this point, the consumer should be nullify until an
214 * enable_consumer command. This assignment is symbolic since we've zmalloc
215 * the struct.
216 */
217 lus->tmp_consumer = NULL;
218
219 /* Use the default consumer output which is the tracing session path. */
a4b92340 220 if (path && strlen(path) > 0) {
c617c0c6
MD
221 int ret;
222
a4b92340
DG
223 ret = snprintf(lus->consumer->dst.trace_path, PATH_MAX,
224 "%s" DEFAULT_UST_TRACE_DIR, path);
225 if (ret < 0) {
226 PERROR("snprintf UST consumer trace path");
09a90bcd 227 goto error_path;
a4b92340
DG
228 }
229
230 /* Set session path */
231 ret = snprintf(lus->pathname, PATH_MAX, "%s" DEFAULT_UST_TRACE_DIR,
232 path);
233 if (ret < 0) {
234 PERROR("snprintf kernel traces path");
09a90bcd 235 goto error_path;
a4b92340 236 }
0177d773
DG
237 }
238
44d3bd01
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239 DBG2("UST trace session create successful");
240
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241 return lus;
242
09a90bcd
DG
243error_path:
244 consumer_destroy_output(lus->consumer);
245error_consumer:
a2c0da86
MD
246 lttng_ht_destroy(lus->domain_global.channels);
247 lttng_ht_destroy(lus->domain_exec);
248 lttng_ht_destroy(lus->domain_pid);
44844c29 249 free(lus);
97ee3a89
DG
250error:
251 return NULL;
252}
253
254/*
255 * Allocate and initialize a ust channel data structure.
256 *
257 * Return pointer to structure or NULL.
258 */
44d3bd01
DG
259struct ltt_ust_channel *trace_ust_create_channel(struct lttng_channel *chan,
260 char *path)
97ee3a89
DG
261{
262 int ret;
263 struct ltt_ust_channel *luc;
264
37357452 265 luc = zmalloc(sizeof(struct ltt_ust_channel));
97ee3a89 266 if (luc == NULL) {
df0f840b 267 PERROR("ltt_ust_channel zmalloc");
97ee3a89
DG
268 goto error;
269 }
270
44d3bd01 271 /* Copy UST channel attributes */
48842b30
DG
272 luc->attr.overwrite = chan->attr.overwrite;
273 luc->attr.subbuf_size = chan->attr.subbuf_size;
274 luc->attr.num_subbuf = chan->attr.num_subbuf;
275 luc->attr.switch_timer_interval = chan->attr.switch_timer_interval;
276 luc->attr.read_timer_interval = chan->attr.read_timer_interval;
6775595e 277 luc->attr.output = (enum lttng_ust_output) chan->attr.output;
44d3bd01
DG
278
279 /* Translate to UST output enum */
280 switch (luc->attr.output) {
281 default:
282 luc->attr.output = LTTNG_UST_MMAP;
283 break;
97ee3a89 284 }
97ee3a89 285
97ee3a89 286 /* Copy channel name */
0a1459bb 287 strncpy(luc->name, chan->name, sizeof(luc->name));
97ee3a89
DG
288 luc->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
289
f6a9efaa 290 /* Init node */
bec39940 291 lttng_ht_node_init_str(&luc->node, luc->name);
f6a9efaa 292 /* Alloc hash tables */
bec39940
DG
293 luc->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
294 luc->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
f6a9efaa 295
97ee3a89 296 /* Set trace output path */
48842b30 297 ret = snprintf(luc->pathname, PATH_MAX, "%s", path);
97ee3a89 298 if (ret < 0) {
df0f840b 299 PERROR("asprintf ust create channel");
44844c29 300 goto error_free_channel;
97ee3a89
DG
301 }
302
f6a9efaa
DG
303 DBG2("Trace UST channel %s created", luc->name);
304
97ee3a89
DG
305 return luc;
306
44844c29 307error_free_channel:
a2c0da86
MD
308 lttng_ht_destroy(luc->ctx);
309 lttng_ht_destroy(luc->events);
44844c29 310 free(luc);
97ee3a89
DG
311error:
312 return NULL;
313}
314
315/*
316 * Allocate and initialize a ust event. Set name and event type.
317 *
318 * Return pointer to structure or NULL.
319 */
025faf73
DG
320struct ltt_ust_event *trace_ust_create_event(struct lttng_event *ev,
321 struct lttng_filter_bytecode *filter)
97ee3a89
DG
322{
323 struct ltt_ust_event *lue;
97ee3a89 324
37357452 325 lue = zmalloc(sizeof(struct ltt_ust_event));
44d3bd01 326 if (lue == NULL) {
ba7f0ae5 327 PERROR("ust event zmalloc");
97ee3a89
DG
328 goto error;
329 }
330
331 switch (ev->type) {
332 case LTTNG_EVENT_PROBE:
44d3bd01 333 lue->attr.instrumentation = LTTNG_UST_PROBE;
97ee3a89
DG
334 break;
335 case LTTNG_EVENT_FUNCTION:
44d3bd01 336 lue->attr.instrumentation = LTTNG_UST_FUNCTION;
97ee3a89
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337 break;
338 case LTTNG_EVENT_FUNCTION_ENTRY:
44d3bd01 339 lue->attr.instrumentation = LTTNG_UST_FUNCTION;
97ee3a89
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340 break;
341 case LTTNG_EVENT_TRACEPOINT:
44d3bd01 342 lue->attr.instrumentation = LTTNG_UST_TRACEPOINT;
97ee3a89
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343 break;
344 default:
345 ERR("Unknown ust instrumentation type (%d)", ev->type);
44844c29 346 goto error_free_event;
97ee3a89
DG
347 }
348
349 /* Copy event name */
44d3bd01
DG
350 strncpy(lue->attr.name, ev->name, LTTNG_UST_SYM_NAME_LEN);
351 lue->attr.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
97ee3a89 352
0cda4f28 353 switch (ev->loglevel_type) {
8005f29a
MD
354 case LTTNG_EVENT_LOGLEVEL_ALL:
355 lue->attr.loglevel_type = LTTNG_UST_LOGLEVEL_ALL;
22e25b71 356 lue->attr.loglevel = -1; /* Force to -1 */
0cda4f28 357 break;
8005f29a
MD
358 case LTTNG_EVENT_LOGLEVEL_RANGE:
359 lue->attr.loglevel_type = LTTNG_UST_LOGLEVEL_RANGE;
22e25b71 360 lue->attr.loglevel = ev->loglevel;
8005f29a
MD
361 break;
362 case LTTNG_EVENT_LOGLEVEL_SINGLE:
363 lue->attr.loglevel_type = LTTNG_UST_LOGLEVEL_SINGLE;
22e25b71 364 lue->attr.loglevel = ev->loglevel;
0cda4f28
MD
365 break;
366 default:
4431494b 367 ERR("Unknown ust loglevel type (%d)", ev->loglevel_type);
0cda4f28
MD
368 goto error_free_event;
369 }
370
025faf73
DG
371 /* Same layout. */
372 lue->filter = (struct lttng_ust_filter_bytecode *) filter;
0cda4f28 373
f6a9efaa 374 /* Init node */
bec39940 375 lttng_ht_node_init_str(&lue->node, lue->attr.name);
97ee3a89 376
300b8fd5
MD
377 DBG2("Trace UST event %s, loglevel (%d,%d) created",
378 lue->attr.name, lue->attr.loglevel_type,
379 lue->attr.loglevel);
284d8f55 380
97ee3a89
DG
381 return lue;
382
44844c29
MD
383error_free_event:
384 free(lue);
97ee3a89
DG
385error:
386 return NULL;
387}
388
389/*
390 * Allocate and initialize a ust metadata.
391 *
392 * Return pointer to structure or NULL.
393 */
394struct ltt_ust_metadata *trace_ust_create_metadata(char *path)
395{
396 int ret;
397 struct ltt_ust_metadata *lum;
97ee3a89 398
3a009adb 399 lum = zmalloc(sizeof(struct ltt_ust_metadata));
44d3bd01 400 if (lum == NULL) {
df0f840b 401 PERROR("ust metadata zmalloc");
97ee3a89
DG
402 goto error;
403 }
404
405 /* Set default attributes */
44d3bd01 406 lum->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
3e230f92 407 lum->attr.subbuf_size = default_get_metadata_subbuf_size();
44d3bd01
DG
408 lum->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
409 lum->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
410 lum->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
d41f73b7 411 lum->attr.output = LTTNG_UST_MMAP;
44d3bd01 412
97ee3a89
DG
413 lum->handle = -1;
414 /* Set metadata trace path */
f6a9efaa 415 ret = snprintf(lum->pathname, PATH_MAX, "%s/metadata", path);
97ee3a89 416 if (ret < 0) {
df0f840b 417 PERROR("asprintf ust metadata");
44844c29 418 goto error_free_metadata;
97ee3a89
DG
419 }
420
421 return lum;
422
44844c29
MD
423error_free_metadata:
424 free(lum);
97ee3a89
DG
425error:
426 return NULL;
427}
428
55cc08a6
DG
429/*
430 * Allocate and initialize an UST context.
431 *
432 * Return pointer to structure or NULL.
433 */
434struct ltt_ust_context *trace_ust_create_context(
435 struct lttng_event_context *ctx)
436{
437 struct ltt_ust_context *uctx;
9197c5c4
MD
438 enum lttng_ust_context_type utype;
439
440 switch (ctx->ctx) {
441 case LTTNG_EVENT_CONTEXT_VTID:
442 utype = LTTNG_UST_CONTEXT_VTID;
443 break;
444 case LTTNG_EVENT_CONTEXT_VPID:
445 utype = LTTNG_UST_CONTEXT_VPID;
446 break;
447 case LTTNG_EVENT_CONTEXT_PTHREAD_ID:
448 utype = LTTNG_UST_CONTEXT_PTHREAD_ID;
449 break;
450 case LTTNG_EVENT_CONTEXT_PROCNAME:
451 utype = LTTNG_UST_CONTEXT_PROCNAME;
452 break;
453 default:
454 ERR("Invalid UST context");
455 return NULL;
456 }
55cc08a6
DG
457
458 uctx = zmalloc(sizeof(struct ltt_ust_context));
459 if (uctx == NULL) {
460 PERROR("zmalloc ltt_ust_context");
461 goto error;
462 }
463
9197c5c4 464 uctx->ctx.ctx = utype;
bec39940 465 lttng_ht_node_init_ulong(&uctx->node, (unsigned long) uctx->ctx.ctx);
55cc08a6
DG
466
467 return uctx;
468
469error:
470 return NULL;
471}
472
f6a9efaa
DG
473/*
474 * RCU safe free context structure.
475 */
476static void destroy_context_rcu(struct rcu_head *head)
477{
bec39940
DG
478 struct lttng_ht_node_ulong *node =
479 caa_container_of(head, struct lttng_ht_node_ulong, head);
f6a9efaa
DG
480 struct ltt_ust_context *ctx =
481 caa_container_of(node, struct ltt_ust_context, node);
482
483 free(ctx);
484}
485
486/*
487 * Cleanup UST context hash table.
488 */
7bd39047 489static void destroy_contexts(struct lttng_ht *ht)
f6a9efaa
DG
490{
491 int ret;
bec39940
DG
492 struct lttng_ht_node_ulong *node;
493 struct lttng_ht_iter iter;
f6a9efaa 494
bec39940
DG
495 cds_lfht_for_each_entry(ht->ht, &iter.iter, node, node) {
496 ret = lttng_ht_del(ht, &iter);
f6a9efaa
DG
497 if (!ret) {
498 call_rcu(&node->head, destroy_context_rcu);
499 }
f6a9efaa 500 }
ed52805d 501
bec39940 502 lttng_ht_destroy(ht);
f6a9efaa
DG
503}
504
97ee3a89
DG
505/*
506 * Cleanup ust event structure.
507 */
508void trace_ust_destroy_event(struct ltt_ust_event *event)
509{
f6a9efaa 510 DBG2("Trace destroy UST event %s", event->attr.name);
53a80697 511 free(event->filter);
97ee3a89
DG
512 free(event);
513}
514
f6a9efaa
DG
515/*
516 * URCU intermediate call to complete destroy event.
517 */
518static void destroy_event_rcu(struct rcu_head *head)
519{
bec39940
DG
520 struct lttng_ht_node_str *node =
521 caa_container_of(head, struct lttng_ht_node_str, head);
f6a9efaa
DG
522 struct ltt_ust_event *event =
523 caa_container_of(node, struct ltt_ust_event, node);
524
525 trace_ust_destroy_event(event);
526}
527
284d8f55
DG
528/*
529 * Cleanup UST events hashtable.
530 */
7bd39047 531static void destroy_events(struct lttng_ht *events)
ed52805d
DG
532{
533 int ret;
bec39940
DG
534 struct lttng_ht_node_str *node;
535 struct lttng_ht_iter iter;
ed52805d 536
bec39940
DG
537 cds_lfht_for_each_entry(events->ht, &iter.iter, node, node) {
538 ret = lttng_ht_del(events, &iter);
7bd39047
DG
539 assert(!ret);
540 call_rcu(&node->head, destroy_event_rcu);
ed52805d
DG
541 }
542
bec39940 543 lttng_ht_destroy(events);
ed52805d
DG
544}
545
97ee3a89
DG
546/*
547 * Cleanup ust channel structure.
548 */
549void trace_ust_destroy_channel(struct ltt_ust_channel *channel)
550{
f6a9efaa 551 DBG2("Trace destroy UST channel %s", channel->name);
97ee3a89 552
f6a9efaa
DG
553 rcu_read_lock();
554
7bd39047
DG
555 /* Destroying all events of the channel */
556 destroy_events(channel->events);
557 /* Destroying all context of the channel */
558 destroy_contexts(channel->ctx);
97ee3a89 559
97ee3a89 560 free(channel);
f6a9efaa
DG
561
562 rcu_read_unlock();
563}
564
565/*
566 * URCU intermediate call to complete destroy channel.
567 */
568static void destroy_channel_rcu(struct rcu_head *head)
569{
bec39940
DG
570 struct lttng_ht_node_str *node =
571 caa_container_of(head, struct lttng_ht_node_str, head);
f6a9efaa
DG
572 struct ltt_ust_channel *channel =
573 caa_container_of(node, struct ltt_ust_channel, node);
574
575 trace_ust_destroy_channel(channel);
97ee3a89
DG
576}
577
578/*
579 * Cleanup ust metadata structure.
580 */
581void trace_ust_destroy_metadata(struct ltt_ust_metadata *metadata)
582{
abc9138a
MD
583 if (!metadata->handle) {
584 return;
585 }
f6a9efaa 586 DBG2("Trace UST destroy metadata %d", metadata->handle);
97ee3a89
DG
587 free(metadata);
588}
589
590/*
f6a9efaa 591 * Iterate over a hash table containing channels and cleanup safely.
97ee3a89 592 */
bec39940 593static void destroy_channels(struct lttng_ht *channels)
f6a9efaa
DG
594{
595 int ret;
bec39940
DG
596 struct lttng_ht_node_str *node;
597 struct lttng_ht_iter iter;
f6a9efaa 598
24d1723f
DG
599 rcu_read_lock();
600
bec39940
DG
601 cds_lfht_for_each_entry(channels->ht, &iter.iter, node, node) {
602 ret = lttng_ht_del(channels, &iter);
7bd39047
DG
603 assert(!ret);
604 call_rcu(&node->head, destroy_channel_rcu);
f6a9efaa 605 }
ed52805d 606
bec39940 607 lttng_ht_destroy(channels);
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608
609 rcu_read_unlock();
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610}
611
612/*
613 * Cleanup UST pid domain.
614 */
bec39940 615static void destroy_domain_pid(struct lttng_ht *ht)
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616{
617 int ret;
bec39940 618 struct lttng_ht_iter iter;
ed52805d 619 struct ltt_ust_domain_pid *dpid;
f6a9efaa 620
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621 cds_lfht_for_each_entry(ht->ht, &iter.iter, dpid, node.node) {
622 ret = lttng_ht_del(ht , &iter);
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623 assert(!ret);
624 destroy_channels(dpid->channels);
f6a9efaa 625 }
ed52805d 626
bec39940 627 lttng_ht_destroy(ht);
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628}
629
630/*
631 * Cleanup UST exec name domain.
632 */
bec39940 633static void destroy_domain_exec(struct lttng_ht *ht)
97ee3a89 634{
f6a9efaa 635 int ret;
bec39940 636 struct lttng_ht_iter iter;
ed52805d 637 struct ltt_ust_domain_exec *dexec;
f6a9efaa 638
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639 cds_lfht_for_each_entry(ht->ht, &iter.iter, dexec, node.node) {
640 ret = lttng_ht_del(ht , &iter);
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641 assert(!ret);
642 destroy_channels(dexec->channels);
f6a9efaa 643 }
ed52805d 644
bec39940 645 lttng_ht_destroy(ht);
f6a9efaa 646}
97ee3a89 647
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648/*
649 * Cleanup UST global domain.
650 */
651static void destroy_domain_global(struct ltt_ust_domain_global *dom)
652{
653 destroy_channels(dom->channels);
654}
97ee3a89 655
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656/*
657 * Cleanup ust session structure
658 */
659void trace_ust_destroy_session(struct ltt_ust_session *session)
660{
ed52805d 661 /* Extra protection */
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662 if (session == NULL) {
663 return;
664 }
665
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666 rcu_read_lock();
667
fc4705fe 668 DBG2("Trace UST destroy session %u", session->id);
f6a9efaa 669
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670 /* Cleaning up UST domain */
671 destroy_domain_global(&session->domain_global);
672 destroy_domain_pid(session->domain_pid);
673 destroy_domain_exec(session->domain_exec);
44d3bd01 674
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675 consumer_destroy_output(session->consumer);
676 consumer_destroy_output(session->tmp_consumer);
677
97ee3a89 678 free(session);
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679
680 rcu_read_unlock();
97ee3a89 681}
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