Backported to glibc 2.8
[lttng-tools.git] / src / bin / lttng-sessiond / trace-ust.c
CommitLineData
97ee3a89
DG
1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
d14d33bf
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 *
d14d33bf
AM
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 *
d14d33bf
AM
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.
97ee3a89
DG
16 */
17
18#define _GNU_SOURCE
19#include <stdio.h>
20#include <stdlib.h>
21#include <string.h>
22#include <unistd.h>
d9bf3ca4 23#include <inttypes.h>
97ee3a89 24
990570ed
DG
25#include <common/common.h>
26#include <common/defaults.h>
97ee3a89 27
7972aab2 28#include "buffer-registry.h"
97ee3a89 29#include "trace-ust.h"
0b2dc8df 30#include "utils.h"
97ee3a89 31
025faf73
DG
32/*
33 * Match function for the events hash table lookup.
34 *
35 * Matches by name only. Used by the disable command.
36 */
18eace3b
DG
37int trace_ust_ht_match_event_by_name(struct cds_lfht_node *node,
38 const void *_key)
39{
40 struct ltt_ust_event *event;
41 const char *name;
42
43 assert(node);
44 assert(_key);
45
46 event = caa_container_of(node, struct ltt_ust_event, node.node);
47 name = _key;
48
49 /* Event name */
50 if (strncmp(event->attr.name, name, sizeof(event->attr.name)) != 0) {
51 goto no_match;
52 }
53
025faf73 54 /* Match */
18eace3b
DG
55 return 1;
56
57no_match:
58 return 0;
59}
60
025faf73
DG
61/*
62 * Match function for the hash table lookup.
63 *
64 * It matches an ust event based on three attributes which are the event name,
65 * the filter bytecode and the loglevel.
66 */
18eace3b
DG
67int trace_ust_ht_match_event(struct cds_lfht_node *node, const void *_key)
68{
69 struct ltt_ust_event *event;
70 const struct ltt_ust_ht_key *key;
71
72 assert(node);
73 assert(_key);
74
75 event = caa_container_of(node, struct ltt_ust_event, node.node);
76 key = _key;
77
f19e9f8b 78 /* Match the 4 elements of the key: name, filter, loglevel, exclusions. */
18eace3b
DG
79
80 /* Event name */
81 if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) {
18eace3b
DG
82 goto no_match;
83 }
84
85 /* Event loglevel. */
86 if (event->attr.loglevel != key->loglevel) {
025faf73
DG
87 if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL
88 && key->loglevel == 0 && event->attr.loglevel == -1) {
18eace3b 89 /*
025faf73
DG
90 * Match is accepted. This is because on event creation, the
91 * loglevel is set to -1 if the event loglevel type is ALL so 0 and
92 * -1 are accepted for this loglevel type since 0 is the one set by
93 * the API when receiving an enable event.
18eace3b
DG
94 */
95 } else {
18eace3b
DG
96 goto no_match;
97 }
98 }
99
100 /* Only one of the filters is NULL, fail. */
101 if ((key->filter && !event->filter) || (!key->filter && event->filter)) {
18eace3b
DG
102 goto no_match;
103 }
104
025faf73
DG
105 if (key->filter && event->filter) {
106 /* Both filters exists, check length followed by the bytecode. */
107 if (event->filter->len != key->filter->len ||
108 memcmp(event->filter->data, key->filter->data,
109 event->filter->len) != 0) {
110 goto no_match;
111 }
18eace3b
DG
112 }
113
f19e9f8b
JI
114 /* If only one of the exclusions is NULL, fail. */
115 if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) {
116 goto no_match;
117 }
118
119 if (key->exclusion && event->exclusion) {
120 /* Both exclusions exist; check count followed by names. */
121 if (event->exclusion->count != key->exclusion->count ||
122 memcmp(event->exclusion->names, key->exclusion->names,
123 event->exclusion->count * LTTNG_SYMBOL_NAME_LEN) != 0) {
124 goto no_match;
125 }
126 }
025faf73
DG
127 /* Match. */
128 return 1;
18eace3b
DG
129
130no_match:
131 return 0;
18eace3b
DG
132}
133
0177d773 134/*
2223c96f
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135 * Find the channel in the hashtable and return channel pointer. RCU read side
136 * lock MUST be acquired before calling this.
0177d773 137 */
bec39940 138struct ltt_ust_channel *trace_ust_find_channel_by_name(struct lttng_ht *ht,
f6a9efaa 139 char *name)
0177d773 140{
bec39940
DG
141 struct lttng_ht_node_str *node;
142 struct lttng_ht_iter iter;
0177d773 143
85076754
MD
144 /*
145 * If we receive an empty string for channel name, it means the
146 * default channel name is requested.
147 */
148 if (name[0] == '\0')
149 name = DEFAULT_CHANNEL_NAME;
150
bec39940
DG
151 lttng_ht_lookup(ht, (void *)name, &iter);
152 node = lttng_ht_iter_get_node_str(&iter);
f6a9efaa 153 if (node == NULL) {
44d3bd01
DG
154 goto error;
155 }
156
f6a9efaa 157 DBG2("Trace UST channel %s found by name", name);
0177d773 158
f6a9efaa 159 return caa_container_of(node, struct ltt_ust_channel, node);
97ee3a89
DG
160
161error:
f6a9efaa 162 DBG2("Trace UST channel %s not found by name", name);
97ee3a89
DG
163 return NULL;
164}
165
166/*
2223c96f
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167 * Find the event in the hashtable and return event pointer. RCU read side lock
168 * MUST be acquired before calling this.
97ee3a89 169 */
18eace3b 170struct ltt_ust_event *trace_ust_find_event(struct lttng_ht *ht,
10646003
JI
171 char *name, struct lttng_filter_bytecode *filter, int loglevel,
172 struct lttng_event_exclusion *exclusion)
97ee3a89 173{
bec39940
DG
174 struct lttng_ht_node_str *node;
175 struct lttng_ht_iter iter;
18eace3b 176 struct ltt_ust_ht_key key;
97ee3a89 177
18eace3b
DG
178 assert(name);
179 assert(ht);
180
181 key.name = name;
182 key.filter = filter;
183 key.loglevel = loglevel;
10646003 184 key.exclusion = exclusion;
18eace3b 185
18eace3b
DG
186 cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed),
187 trace_ust_ht_match_event, &key, &iter.iter);
bec39940 188 node = lttng_ht_iter_get_node_str(&iter);
f6a9efaa 189 if (node == NULL) {
97ee3a89
DG
190 goto error;
191 }
192
18eace3b 193 DBG2("Trace UST event %s found", key.name);
f6a9efaa
DG
194
195 return caa_container_of(node, struct ltt_ust_event, node);
97ee3a89
DG
196
197error:
18eace3b 198 DBG2("Trace UST event %s NOT found", key.name);
97ee3a89
DG
199 return NULL;
200}
201
202/*
203 * Allocate and initialize a ust session data structure.
204 *
205 * Return pointer to structure or NULL.
206 */
d9bf3ca4 207struct ltt_ust_session *trace_ust_create_session(uint64_t session_id)
97ee3a89 208{
0475c50c 209 int ret;
97ee3a89
DG
210 struct ltt_ust_session *lus;
211
212 /* Allocate a new ltt ust session */
ba7f0ae5 213 lus = zmalloc(sizeof(struct ltt_ust_session));
97ee3a89 214 if (lus == NULL) {
ba7f0ae5 215 PERROR("create ust session zmalloc");
97ee3a89
DG
216 goto error;
217 }
218
219 /* Init data structure */
a991f516 220 lus->id = session_id;
14fb1ebe 221 lus->active = 0;
97ee3a89 222
84ad93e8
DG
223 /* Set default metadata channel attribute. */
224 lus->metadata_attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
225 lus->metadata_attr.subbuf_size = default_get_metadata_subbuf_size();
226 lus->metadata_attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
227 lus->metadata_attr.switch_timer_interval = DEFAULT_METADATA_SWITCH_TIMER;
228 lus->metadata_attr.read_timer_interval = DEFAULT_METADATA_READ_TIMER;
229 lus->metadata_attr.output = LTTNG_UST_MMAP;
230
7972aab2
DG
231 /*
232 * Default buffer type. This can be changed through an enable channel
233 * requesting a different type. Note that this can only be changed once
234 * during the session lifetime which is at the first enable channel and
235 * only before start. The flag buffer_type_changed indicates the status.
236 */
8692d4e5 237 lus->buffer_type = LTTNG_BUFFER_PER_UID;
7972aab2
DG
238 /* Once set to 1, the buffer_type is immutable for the session. */
239 lus->buffer_type_changed = 0;
240 /* Init it in case it get used after allocation. */
241 CDS_INIT_LIST_HEAD(&lus->buffer_reg_uid_list);
f6a9efaa
DG
242
243 /* Alloc UST global domain channels' HT */
bec39940 244 lus->domain_global.channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
0475c50c
DG
245 ret = jul_init_domain(&lus->domain_jul);
246 if (ret < 0) {
247 goto error_consumer;
248 }
44d3bd01 249
00e2e675
DG
250 lus->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
251 if (lus->consumer == NULL) {
09a90bcd 252 goto error_consumer;
00e2e675
DG
253 }
254
255 /*
256 * The tmp_consumer stays NULL until a set_consumer_uri command is
257 * executed. At this point, the consumer should be nullify until an
258 * enable_consumer command. This assignment is symbolic since we've zmalloc
259 * the struct.
260 */
261 lus->tmp_consumer = NULL;
262
44d3bd01
DG
263 DBG2("UST trace session create successful");
264
97ee3a89
DG
265 return lus;
266
09a90bcd 267error_consumer:
0b2dc8df 268 ht_cleanup_push(lus->domain_global.channels);
0475c50c 269 jul_destroy_domain(&lus->domain_jul);
44844c29 270 free(lus);
97ee3a89
DG
271error:
272 return NULL;
273}
274
275/*
276 * Allocate and initialize a ust channel data structure.
277 *
278 * Return pointer to structure or NULL.
279 */
dec56f6c 280struct ltt_ust_channel *trace_ust_create_channel(struct lttng_channel *chan)
97ee3a89 281{
97ee3a89
DG
282 struct ltt_ust_channel *luc;
283
0525e9ae 284 assert(chan);
0525e9ae 285
37357452 286 luc = zmalloc(sizeof(struct ltt_ust_channel));
97ee3a89 287 if (luc == NULL) {
df0f840b 288 PERROR("ltt_ust_channel zmalloc");
97ee3a89
DG
289 goto error;
290 }
291
44d3bd01 292 /* Copy UST channel attributes */
48842b30
DG
293 luc->attr.overwrite = chan->attr.overwrite;
294 luc->attr.subbuf_size = chan->attr.subbuf_size;
295 luc->attr.num_subbuf = chan->attr.num_subbuf;
296 luc->attr.switch_timer_interval = chan->attr.switch_timer_interval;
297 luc->attr.read_timer_interval = chan->attr.read_timer_interval;
6775595e 298 luc->attr.output = (enum lttng_ust_output) chan->attr.output;
44d3bd01
DG
299
300 /* Translate to UST output enum */
301 switch (luc->attr.output) {
302 default:
303 luc->attr.output = LTTNG_UST_MMAP;
304 break;
97ee3a89 305 }
97ee3a89 306
85076754
MD
307 /*
308 * If we receive an empty string for channel name, it means the
309 * default channel name is requested.
310 */
311 if (chan->name[0] == '\0') {
312 strncpy(luc->name, DEFAULT_CHANNEL_NAME, sizeof(luc->name));
313 } else {
314 /* Copy channel name */
315 strncpy(luc->name, chan->name, sizeof(luc->name));
316 }
97ee3a89
DG
317 luc->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
318
f6a9efaa 319 /* Init node */
bec39940 320 lttng_ht_node_init_str(&luc->node, luc->name);
31746f93
DG
321 CDS_INIT_LIST_HEAD(&luc->ctx_list);
322
f6a9efaa 323 /* Alloc hash tables */
bec39940
DG
324 luc->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
325 luc->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
f6a9efaa 326
1624d5b7
JD
327 /* On-disk circular buffer parameters */
328 luc->tracefile_size = chan->attr.tracefile_size;
329 luc->tracefile_count = chan->attr.tracefile_count;
330
f6a9efaa
DG
331 DBG2("Trace UST channel %s created", luc->name);
332
97ee3a89 333error:
7972aab2 334 return luc;
97ee3a89
DG
335}
336
337/*
338 * Allocate and initialize a ust event. Set name and event type.
339 *
340 * Return pointer to structure or NULL.
341 */
025faf73 342struct ltt_ust_event *trace_ust_create_event(struct lttng_event *ev,
6b453b5e 343 char *filter_expression,
561c6897
JI
344 struct lttng_filter_bytecode *filter,
345 struct lttng_event_exclusion *exclusion)
97ee3a89
DG
346{
347 struct ltt_ust_event *lue;
97ee3a89 348
0525e9ae
DG
349 assert(ev);
350
37357452 351 lue = zmalloc(sizeof(struct ltt_ust_event));
44d3bd01 352 if (lue == NULL) {
ba7f0ae5 353 PERROR("ust event zmalloc");
97ee3a89
DG
354 goto error;
355 }
356
357 switch (ev->type) {
358 case LTTNG_EVENT_PROBE:
44d3bd01 359 lue->attr.instrumentation = LTTNG_UST_PROBE;
97ee3a89
DG
360 break;
361 case LTTNG_EVENT_FUNCTION:
44d3bd01 362 lue->attr.instrumentation = LTTNG_UST_FUNCTION;
97ee3a89
DG
363 break;
364 case LTTNG_EVENT_FUNCTION_ENTRY:
44d3bd01 365 lue->attr.instrumentation = LTTNG_UST_FUNCTION;
97ee3a89
DG
366 break;
367 case LTTNG_EVENT_TRACEPOINT:
44d3bd01 368 lue->attr.instrumentation = LTTNG_UST_TRACEPOINT;
97ee3a89
DG
369 break;
370 default:
371 ERR("Unknown ust instrumentation type (%d)", ev->type);
44844c29 372 goto error_free_event;
97ee3a89
DG
373 }
374
375 /* Copy event name */
44d3bd01
DG
376 strncpy(lue->attr.name, ev->name, LTTNG_UST_SYM_NAME_LEN);
377 lue->attr.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
97ee3a89 378
0cda4f28 379 switch (ev->loglevel_type) {
8005f29a
MD
380 case LTTNG_EVENT_LOGLEVEL_ALL:
381 lue->attr.loglevel_type = LTTNG_UST_LOGLEVEL_ALL;
22e25b71 382 lue->attr.loglevel = -1; /* Force to -1 */
0cda4f28 383 break;
8005f29a
MD
384 case LTTNG_EVENT_LOGLEVEL_RANGE:
385 lue->attr.loglevel_type = LTTNG_UST_LOGLEVEL_RANGE;
22e25b71 386 lue->attr.loglevel = ev->loglevel;
8005f29a
MD
387 break;
388 case LTTNG_EVENT_LOGLEVEL_SINGLE:
389 lue->attr.loglevel_type = LTTNG_UST_LOGLEVEL_SINGLE;
22e25b71 390 lue->attr.loglevel = ev->loglevel;
0cda4f28
MD
391 break;
392 default:
4431494b 393 ERR("Unknown ust loglevel type (%d)", ev->loglevel_type);
0cda4f28
MD
394 goto error_free_event;
395 }
396
025faf73 397 /* Same layout. */
6b453b5e 398 lue->filter_expression = filter_expression;
025faf73 399 lue->filter = (struct lttng_ust_filter_bytecode *) filter;
561c6897 400 lue->exclusion = (struct lttng_event_exclusion *) exclusion;
0cda4f28 401
f6a9efaa 402 /* Init node */
bec39940 403 lttng_ht_node_init_str(&lue->node, lue->attr.name);
97ee3a89 404
300b8fd5
MD
405 DBG2("Trace UST event %s, loglevel (%d,%d) created",
406 lue->attr.name, lue->attr.loglevel_type,
407 lue->attr.loglevel);
284d8f55 408
97ee3a89
DG
409 return lue;
410
44844c29
MD
411error_free_event:
412 free(lue);
97ee3a89
DG
413error:
414 return NULL;
415}
416
55cc08a6
DG
417/*
418 * Allocate and initialize an UST context.
419 *
420 * Return pointer to structure or NULL.
421 */
422struct ltt_ust_context *trace_ust_create_context(
423 struct lttng_event_context *ctx)
424{
425 struct ltt_ust_context *uctx;
9197c5c4
MD
426 enum lttng_ust_context_type utype;
427
0525e9ae
DG
428 assert(ctx);
429
9197c5c4
MD
430 switch (ctx->ctx) {
431 case LTTNG_EVENT_CONTEXT_VTID:
432 utype = LTTNG_UST_CONTEXT_VTID;
433 break;
434 case LTTNG_EVENT_CONTEXT_VPID:
435 utype = LTTNG_UST_CONTEXT_VPID;
436 break;
437 case LTTNG_EVENT_CONTEXT_PTHREAD_ID:
438 utype = LTTNG_UST_CONTEXT_PTHREAD_ID;
439 break;
440 case LTTNG_EVENT_CONTEXT_PROCNAME:
441 utype = LTTNG_UST_CONTEXT_PROCNAME;
442 break;
7c612c2e
WP
443 case LTTNG_EVENT_CONTEXT_IP:
444 utype = LTTNG_UST_CONTEXT_IP;
445 break;
9197c5c4
MD
446 default:
447 ERR("Invalid UST context");
448 return NULL;
449 }
55cc08a6
DG
450
451 uctx = zmalloc(sizeof(struct ltt_ust_context));
452 if (uctx == NULL) {
453 PERROR("zmalloc ltt_ust_context");
454 goto error;
455 }
456
9197c5c4 457 uctx->ctx.ctx = utype;
bec39940 458 lttng_ht_node_init_ulong(&uctx->node, (unsigned long) uctx->ctx.ctx);
31746f93 459 CDS_INIT_LIST_HEAD(&uctx->list);
55cc08a6
DG
460
461 return uctx;
462
463error:
464 return NULL;
465}
466
f6a9efaa
DG
467/*
468 * RCU safe free context structure.
469 */
470static void destroy_context_rcu(struct rcu_head *head)
471{
bec39940
DG
472 struct lttng_ht_node_ulong *node =
473 caa_container_of(head, struct lttng_ht_node_ulong, head);
f6a9efaa
DG
474 struct ltt_ust_context *ctx =
475 caa_container_of(node, struct ltt_ust_context, node);
476
477 free(ctx);
478}
479
480/*
481 * Cleanup UST context hash table.
482 */
7bd39047 483static void destroy_contexts(struct lttng_ht *ht)
f6a9efaa
DG
484{
485 int ret;
bec39940
DG
486 struct lttng_ht_node_ulong *node;
487 struct lttng_ht_iter iter;
31746f93 488 struct ltt_ust_context *ctx;
f6a9efaa 489
0525e9ae
DG
490 assert(ht);
491
36b588ed 492 rcu_read_lock();
bec39940 493 cds_lfht_for_each_entry(ht->ht, &iter.iter, node, node) {
31746f93
DG
494 /* Remove from ordered list. */
495 ctx = caa_container_of(node, struct ltt_ust_context, node);
496 cds_list_del(&ctx->list);
497 /* Remove from channel's hash table. */
bec39940 498 ret = lttng_ht_del(ht, &iter);
f6a9efaa
DG
499 if (!ret) {
500 call_rcu(&node->head, destroy_context_rcu);
501 }
f6a9efaa 502 }
36b588ed 503 rcu_read_unlock();
ed52805d 504
0b2dc8df 505 ht_cleanup_push(ht);
f6a9efaa
DG
506}
507
97ee3a89
DG
508/*
509 * Cleanup ust event structure.
510 */
511void trace_ust_destroy_event(struct ltt_ust_event *event)
512{
0525e9ae
DG
513 assert(event);
514
f6a9efaa 515 DBG2("Trace destroy UST event %s", event->attr.name);
6b453b5e 516 free(event->filter_expression);
53a80697 517 free(event->filter);
40024f8a 518 free(event->exclusion);
97ee3a89
DG
519 free(event);
520}
521
f6a9efaa
DG
522/*
523 * URCU intermediate call to complete destroy event.
524 */
525static void destroy_event_rcu(struct rcu_head *head)
526{
bec39940
DG
527 struct lttng_ht_node_str *node =
528 caa_container_of(head, struct lttng_ht_node_str, head);
f6a9efaa
DG
529 struct ltt_ust_event *event =
530 caa_container_of(node, struct ltt_ust_event, node);
531
532 trace_ust_destroy_event(event);
533}
534
284d8f55
DG
535/*
536 * Cleanup UST events hashtable.
537 */
7bd39047 538static void destroy_events(struct lttng_ht *events)
ed52805d
DG
539{
540 int ret;
bec39940
DG
541 struct lttng_ht_node_str *node;
542 struct lttng_ht_iter iter;
ed52805d 543
0525e9ae
DG
544 assert(events);
545
36b588ed 546 rcu_read_lock();
bec39940
DG
547 cds_lfht_for_each_entry(events->ht, &iter.iter, node, node) {
548 ret = lttng_ht_del(events, &iter);
7bd39047
DG
549 assert(!ret);
550 call_rcu(&node->head, destroy_event_rcu);
ed52805d 551 }
36b588ed 552 rcu_read_unlock();
ed52805d 553
0b2dc8df 554 ht_cleanup_push(events);
ed52805d
DG
555}
556
97ee3a89
DG
557/*
558 * Cleanup ust channel structure.
36b588ed
MD
559 *
560 * Should _NOT_ be called with RCU read lock held.
97ee3a89 561 */
36b588ed 562static void _trace_ust_destroy_channel(struct ltt_ust_channel *channel)
97ee3a89 563{
0525e9ae
DG
564 assert(channel);
565
f6a9efaa 566 DBG2("Trace destroy UST channel %s", channel->name);
97ee3a89 567
7bd39047
DG
568 /* Destroying all events of the channel */
569 destroy_events(channel->events);
570 /* Destroying all context of the channel */
571 destroy_contexts(channel->ctx);
97ee3a89 572
97ee3a89 573 free(channel);
f6a9efaa
DG
574}
575
576/*
577 * URCU intermediate call to complete destroy channel.
578 */
579static void destroy_channel_rcu(struct rcu_head *head)
580{
bec39940
DG
581 struct lttng_ht_node_str *node =
582 caa_container_of(head, struct lttng_ht_node_str, head);
f6a9efaa
DG
583 struct ltt_ust_channel *channel =
584 caa_container_of(node, struct ltt_ust_channel, node);
585
36b588ed
MD
586 _trace_ust_destroy_channel(channel);
587}
588
589void trace_ust_destroy_channel(struct ltt_ust_channel *channel)
590{
591 call_rcu(&channel->node.head, destroy_channel_rcu);
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592}
593
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594/*
595 * Remove an UST channel from a channel HT.
596 */
597void trace_ust_delete_channel(struct lttng_ht *ht,
598 struct ltt_ust_channel *channel)
599{
600 int ret;
601 struct lttng_ht_iter iter;
602
603 assert(ht);
604 assert(channel);
605
606 iter.iter.node = &channel->node.node;
607 ret = lttng_ht_del(ht, &iter);
608 assert(!ret);
609}
610
97ee3a89 611/*
f6a9efaa 612 * Iterate over a hash table containing channels and cleanup safely.
97ee3a89 613 */
bec39940 614static void destroy_channels(struct lttng_ht *channels)
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615{
616 int ret;
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617 struct lttng_ht_node_str *node;
618 struct lttng_ht_iter iter;
f6a9efaa 619
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620 assert(channels);
621
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622 rcu_read_lock();
623
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624 cds_lfht_for_each_entry(channels->ht, &iter.iter, node, node) {
625 ret = lttng_ht_del(channels, &iter);
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626 assert(!ret);
627 call_rcu(&node->head, destroy_channel_rcu);
f6a9efaa 628 }
36b588ed 629 rcu_read_unlock();
ed52805d 630
0b2dc8df 631 ht_cleanup_push(channels);
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632}
633
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634/*
635 * Cleanup UST global domain.
636 */
637static void destroy_domain_global(struct ltt_ust_domain_global *dom)
638{
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639 assert(dom);
640
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641 destroy_channels(dom->channels);
642}
97ee3a89 643
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644/*
645 * Cleanup ust session structure
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646 *
647 * Should *NOT* be called with RCU read-side lock held.
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648 */
649void trace_ust_destroy_session(struct ltt_ust_session *session)
650{
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651 struct buffer_reg_uid *reg, *sreg;
652
0525e9ae 653 assert(session);
97ee3a89 654
d9bf3ca4 655 DBG2("Trace UST destroy session %" PRIu64, session->id);
f6a9efaa 656
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657 /* Cleaning up UST domain */
658 destroy_domain_global(&session->domain_global);
0475c50c 659 jul_destroy_domain(&session->domain_jul);
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660
661 /* Cleanup UID buffer registry object(s). */
662 cds_list_for_each_entry_safe(reg, sreg, &session->buffer_reg_uid_list,
663 lnode) {
664 cds_list_del(&reg->lnode);
665 buffer_reg_uid_remove(reg);
666 buffer_reg_uid_destroy(reg, session->consumer);
667 }
44d3bd01 668
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669 consumer_destroy_output(session->consumer);
670 consumer_destroy_output(session->tmp_consumer);
671
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672 free(session);
673}
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