Fix: agents ht leaks on destroy session
[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 *
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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 *
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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
6c1c0768 19#define _LGPL_SOURCE
97ee3a89
DG
20#include <stdio.h>
21#include <stdlib.h>
22#include <string.h>
23#include <unistd.h>
d9bf3ca4 24#include <inttypes.h>
97ee3a89 25
990570ed
DG
26#include <common/common.h>
27#include <common/defaults.h>
97ee3a89 28
7972aab2 29#include "buffer-registry.h"
97ee3a89 30#include "trace-ust.h"
0b2dc8df 31#include "utils.h"
97ee3a89 32
025faf73
DG
33/*
34 * Match function for the events hash table lookup.
35 *
36 * Matches by name only. Used by the disable command.
37 */
18eace3b
DG
38int trace_ust_ht_match_event_by_name(struct cds_lfht_node *node,
39 const void *_key)
40{
41 struct ltt_ust_event *event;
42 const char *name;
43
44 assert(node);
45 assert(_key);
46
47 event = caa_container_of(node, struct ltt_ust_event, node.node);
48 name = _key;
49
50 /* Event name */
51 if (strncmp(event->attr.name, name, sizeof(event->attr.name)) != 0) {
52 goto no_match;
53 }
54
025faf73 55 /* Match */
18eace3b
DG
56 return 1;
57
58no_match:
59 return 0;
60}
61
025faf73
DG
62/*
63 * Match function for the hash table lookup.
64 *
65 * It matches an ust event based on three attributes which are the event name,
66 * the filter bytecode and the loglevel.
67 */
18eace3b
DG
68int trace_ust_ht_match_event(struct cds_lfht_node *node, const void *_key)
69{
70 struct ltt_ust_event *event;
71 const struct ltt_ust_ht_key *key;
72
73 assert(node);
74 assert(_key);
75
76 event = caa_container_of(node, struct ltt_ust_event, node.node);
77 key = _key;
78
f19e9f8b 79 /* Match the 4 elements of the key: name, filter, loglevel, exclusions. */
18eace3b
DG
80
81 /* Event name */
82 if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) {
18eace3b
DG
83 goto no_match;
84 }
85
86 /* Event loglevel. */
87 if (event->attr.loglevel != key->loglevel) {
025faf73
DG
88 if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL
89 && key->loglevel == 0 && event->attr.loglevel == -1) {
18eace3b 90 /*
025faf73
DG
91 * Match is accepted. This is because on event creation, the
92 * loglevel is set to -1 if the event loglevel type is ALL so 0 and
93 * -1 are accepted for this loglevel type since 0 is the one set by
94 * the API when receiving an enable event.
18eace3b
DG
95 */
96 } else {
18eace3b
DG
97 goto no_match;
98 }
99 }
100
101 /* Only one of the filters is NULL, fail. */
102 if ((key->filter && !event->filter) || (!key->filter && event->filter)) {
18eace3b
DG
103 goto no_match;
104 }
105
025faf73
DG
106 if (key->filter && event->filter) {
107 /* Both filters exists, check length followed by the bytecode. */
108 if (event->filter->len != key->filter->len ||
109 memcmp(event->filter->data, key->filter->data,
110 event->filter->len) != 0) {
111 goto no_match;
112 }
18eace3b
DG
113 }
114
f19e9f8b
JI
115 /* If only one of the exclusions is NULL, fail. */
116 if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) {
117 goto no_match;
118 }
119
120 if (key->exclusion && event->exclusion) {
121 /* Both exclusions exist; check count followed by names. */
122 if (event->exclusion->count != key->exclusion->count ||
123 memcmp(event->exclusion->names, key->exclusion->names,
124 event->exclusion->count * LTTNG_SYMBOL_NAME_LEN) != 0) {
125 goto no_match;
126 }
127 }
025faf73
DG
128 /* Match. */
129 return 1;
18eace3b
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130
131no_match:
132 return 0;
18eace3b
DG
133}
134
0177d773 135/*
2223c96f
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136 * Find the channel in the hashtable and return channel pointer. RCU read side
137 * lock MUST be acquired before calling this.
0177d773 138 */
bec39940 139struct ltt_ust_channel *trace_ust_find_channel_by_name(struct lttng_ht *ht,
f6a9efaa 140 char *name)
0177d773 141{
bec39940
DG
142 struct lttng_ht_node_str *node;
143 struct lttng_ht_iter iter;
0177d773 144
85076754
MD
145 /*
146 * If we receive an empty string for channel name, it means the
147 * default channel name is requested.
148 */
149 if (name[0] == '\0')
150 name = DEFAULT_CHANNEL_NAME;
151
bec39940
DG
152 lttng_ht_lookup(ht, (void *)name, &iter);
153 node = lttng_ht_iter_get_node_str(&iter);
f6a9efaa 154 if (node == NULL) {
44d3bd01
DG
155 goto error;
156 }
157
f6a9efaa 158 DBG2("Trace UST channel %s found by name", name);
0177d773 159
f6a9efaa 160 return caa_container_of(node, struct ltt_ust_channel, node);
97ee3a89
DG
161
162error:
f6a9efaa 163 DBG2("Trace UST channel %s not found by name", name);
97ee3a89
DG
164 return NULL;
165}
166
167/*
2223c96f
DG
168 * Find the event in the hashtable and return event pointer. RCU read side lock
169 * MUST be acquired before calling this.
97ee3a89 170 */
18eace3b 171struct ltt_ust_event *trace_ust_find_event(struct lttng_ht *ht,
10646003
JI
172 char *name, struct lttng_filter_bytecode *filter, int loglevel,
173 struct lttng_event_exclusion *exclusion)
97ee3a89 174{
bec39940
DG
175 struct lttng_ht_node_str *node;
176 struct lttng_ht_iter iter;
18eace3b 177 struct ltt_ust_ht_key key;
97ee3a89 178
18eace3b
DG
179 assert(name);
180 assert(ht);
181
182 key.name = name;
183 key.filter = filter;
184 key.loglevel = loglevel;
10646003 185 key.exclusion = exclusion;
18eace3b 186
18eace3b
DG
187 cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed),
188 trace_ust_ht_match_event, &key, &iter.iter);
bec39940 189 node = lttng_ht_iter_get_node_str(&iter);
f6a9efaa 190 if (node == NULL) {
97ee3a89
DG
191 goto error;
192 }
193
18eace3b 194 DBG2("Trace UST event %s found", key.name);
f6a9efaa
DG
195
196 return caa_container_of(node, struct ltt_ust_event, node);
97ee3a89
DG
197
198error:
18eace3b 199 DBG2("Trace UST event %s NOT found", key.name);
97ee3a89
DG
200 return NULL;
201}
202
fefd409b
DG
203/*
204 * Lookup an agent in the session agents hash table by domain type and return
205 * the object if found else NULL.
4da703ad
JG
206 *
207 * RCU read side lock must be acquired before calling and only released
208 * once the agent is no longer in scope or being used.
fefd409b
DG
209 */
210struct agent *trace_ust_find_agent(struct ltt_ust_session *session,
211 enum lttng_domain_type domain_type)
212{
213 struct agent *agt = NULL;
214 struct lttng_ht_node_u64 *node;
215 struct lttng_ht_iter iter;
216 uint64_t key;
217
218 assert(session);
219
220 DBG3("Trace ust agent lookup for domain %d", domain_type);
221
222 key = domain_type;
223
224 lttng_ht_lookup(session->agents, &key, &iter);
225 node = lttng_ht_iter_get_node_u64(&iter);
226 if (!node) {
227 goto end;
228 }
229 agt = caa_container_of(node, struct agent, node);
230
231end:
232 return agt;
233}
234
97ee3a89
DG
235/*
236 * Allocate and initialize a ust session data structure.
237 *
238 * Return pointer to structure or NULL.
239 */
d9bf3ca4 240struct ltt_ust_session *trace_ust_create_session(uint64_t session_id)
97ee3a89
DG
241{
242 struct ltt_ust_session *lus;
243
244 /* Allocate a new ltt ust session */
ba7f0ae5 245 lus = zmalloc(sizeof(struct ltt_ust_session));
97ee3a89 246 if (lus == NULL) {
ba7f0ae5 247 PERROR("create ust session zmalloc");
97ee3a89
DG
248 goto error;
249 }
250
251 /* Init data structure */
a991f516 252 lus->id = session_id;
14fb1ebe 253 lus->active = 0;
97ee3a89 254
84ad93e8
DG
255 /* Set default metadata channel attribute. */
256 lus->metadata_attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
257 lus->metadata_attr.subbuf_size = default_get_metadata_subbuf_size();
258 lus->metadata_attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
259 lus->metadata_attr.switch_timer_interval = DEFAULT_METADATA_SWITCH_TIMER;
260 lus->metadata_attr.read_timer_interval = DEFAULT_METADATA_READ_TIMER;
261 lus->metadata_attr.output = LTTNG_UST_MMAP;
262
7972aab2
DG
263 /*
264 * Default buffer type. This can be changed through an enable channel
265 * requesting a different type. Note that this can only be changed once
266 * during the session lifetime which is at the first enable channel and
267 * only before start. The flag buffer_type_changed indicates the status.
268 */
8692d4e5 269 lus->buffer_type = LTTNG_BUFFER_PER_UID;
7972aab2
DG
270 /* Once set to 1, the buffer_type is immutable for the session. */
271 lus->buffer_type_changed = 0;
272 /* Init it in case it get used after allocation. */
273 CDS_INIT_LIST_HEAD(&lus->buffer_reg_uid_list);
f6a9efaa
DG
274
275 /* Alloc UST global domain channels' HT */
bec39940 276 lus->domain_global.channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
fefd409b
DG
277 /* Alloc agent hash table. */
278 lus->agents = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
44d3bd01 279
00e2e675
DG
280 lus->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
281 if (lus->consumer == NULL) {
09a90bcd 282 goto error_consumer;
00e2e675
DG
283 }
284
285 /*
286 * The tmp_consumer stays NULL until a set_consumer_uri command is
287 * executed. At this point, the consumer should be nullify until an
288 * enable_consumer command. This assignment is symbolic since we've zmalloc
289 * the struct.
290 */
291 lus->tmp_consumer = NULL;
292
44d3bd01
DG
293 DBG2("UST trace session create successful");
294
97ee3a89
DG
295 return lus;
296
09a90bcd 297error_consumer:
0b2dc8df 298 ht_cleanup_push(lus->domain_global.channels);
fefd409b 299 ht_cleanup_push(lus->agents);
44844c29 300 free(lus);
97ee3a89
DG
301error:
302 return NULL;
303}
304
305/*
306 * Allocate and initialize a ust channel data structure.
307 *
308 * Return pointer to structure or NULL.
309 */
dec56f6c 310struct ltt_ust_channel *trace_ust_create_channel(struct lttng_channel *chan)
97ee3a89 311{
97ee3a89
DG
312 struct ltt_ust_channel *luc;
313
0525e9ae 314 assert(chan);
0525e9ae 315
37357452 316 luc = zmalloc(sizeof(struct ltt_ust_channel));
97ee3a89 317 if (luc == NULL) {
df0f840b 318 PERROR("ltt_ust_channel zmalloc");
97ee3a89
DG
319 goto error;
320 }
321
44d3bd01 322 /* Copy UST channel attributes */
48842b30
DG
323 luc->attr.overwrite = chan->attr.overwrite;
324 luc->attr.subbuf_size = chan->attr.subbuf_size;
325 luc->attr.num_subbuf = chan->attr.num_subbuf;
326 luc->attr.switch_timer_interval = chan->attr.switch_timer_interval;
327 luc->attr.read_timer_interval = chan->attr.read_timer_interval;
6775595e 328 luc->attr.output = (enum lttng_ust_output) chan->attr.output;
44d3bd01
DG
329
330 /* Translate to UST output enum */
331 switch (luc->attr.output) {
332 default:
333 luc->attr.output = LTTNG_UST_MMAP;
334 break;
97ee3a89 335 }
97ee3a89 336
85076754
MD
337 /*
338 * If we receive an empty string for channel name, it means the
339 * default channel name is requested.
340 */
341 if (chan->name[0] == '\0') {
342 strncpy(luc->name, DEFAULT_CHANNEL_NAME, sizeof(luc->name));
343 } else {
344 /* Copy channel name */
345 strncpy(luc->name, chan->name, sizeof(luc->name));
346 }
97ee3a89
DG
347 luc->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
348
f6a9efaa 349 /* Init node */
bec39940 350 lttng_ht_node_init_str(&luc->node, luc->name);
31746f93
DG
351 CDS_INIT_LIST_HEAD(&luc->ctx_list);
352
f6a9efaa 353 /* Alloc hash tables */
bec39940
DG
354 luc->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
355 luc->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
f6a9efaa 356
1624d5b7
JD
357 /* On-disk circular buffer parameters */
358 luc->tracefile_size = chan->attr.tracefile_size;
359 luc->tracefile_count = chan->attr.tracefile_count;
360
f6a9efaa
DG
361 DBG2("Trace UST channel %s created", luc->name);
362
97ee3a89 363error:
7972aab2 364 return luc;
97ee3a89
DG
365}
366
367/*
368 * Allocate and initialize a ust event. Set name and event type.
49d21f93 369 * We own filter_expression, filter, and exclusion.
97ee3a89
DG
370 *
371 * Return pointer to structure or NULL.
372 */
025faf73 373struct ltt_ust_event *trace_ust_create_event(struct lttng_event *ev,
6b453b5e 374 char *filter_expression,
561c6897
JI
375 struct lttng_filter_bytecode *filter,
376 struct lttng_event_exclusion *exclusion)
97ee3a89
DG
377{
378 struct ltt_ust_event *lue;
97ee3a89 379
0525e9ae
DG
380 assert(ev);
381
37357452 382 lue = zmalloc(sizeof(struct ltt_ust_event));
44d3bd01 383 if (lue == NULL) {
ba7f0ae5 384 PERROR("ust event zmalloc");
97ee3a89
DG
385 goto error;
386 }
387
388 switch (ev->type) {
389 case LTTNG_EVENT_PROBE:
44d3bd01 390 lue->attr.instrumentation = LTTNG_UST_PROBE;
97ee3a89
DG
391 break;
392 case LTTNG_EVENT_FUNCTION:
44d3bd01 393 lue->attr.instrumentation = LTTNG_UST_FUNCTION;
97ee3a89
DG
394 break;
395 case LTTNG_EVENT_FUNCTION_ENTRY:
44d3bd01 396 lue->attr.instrumentation = LTTNG_UST_FUNCTION;
97ee3a89
DG
397 break;
398 case LTTNG_EVENT_TRACEPOINT:
44d3bd01 399 lue->attr.instrumentation = LTTNG_UST_TRACEPOINT;
97ee3a89
DG
400 break;
401 default:
402 ERR("Unknown ust instrumentation type (%d)", ev->type);
44844c29 403 goto error_free_event;
97ee3a89
DG
404 }
405
406 /* Copy event name */
44d3bd01
DG
407 strncpy(lue->attr.name, ev->name, LTTNG_UST_SYM_NAME_LEN);
408 lue->attr.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
97ee3a89 409
0cda4f28 410 switch (ev->loglevel_type) {
8005f29a
MD
411 case LTTNG_EVENT_LOGLEVEL_ALL:
412 lue->attr.loglevel_type = LTTNG_UST_LOGLEVEL_ALL;
22e25b71 413 lue->attr.loglevel = -1; /* Force to -1 */
0cda4f28 414 break;
8005f29a
MD
415 case LTTNG_EVENT_LOGLEVEL_RANGE:
416 lue->attr.loglevel_type = LTTNG_UST_LOGLEVEL_RANGE;
22e25b71 417 lue->attr.loglevel = ev->loglevel;
8005f29a
MD
418 break;
419 case LTTNG_EVENT_LOGLEVEL_SINGLE:
420 lue->attr.loglevel_type = LTTNG_UST_LOGLEVEL_SINGLE;
22e25b71 421 lue->attr.loglevel = ev->loglevel;
0cda4f28
MD
422 break;
423 default:
4431494b 424 ERR("Unknown ust loglevel type (%d)", ev->loglevel_type);
0cda4f28
MD
425 goto error_free_event;
426 }
427
025faf73 428 /* Same layout. */
6b453b5e 429 lue->filter_expression = filter_expression;
025faf73 430 lue->filter = (struct lttng_ust_filter_bytecode *) filter;
561c6897 431 lue->exclusion = (struct lttng_event_exclusion *) exclusion;
0cda4f28 432
f6a9efaa 433 /* Init node */
bec39940 434 lttng_ht_node_init_str(&lue->node, lue->attr.name);
97ee3a89 435
300b8fd5
MD
436 DBG2("Trace UST event %s, loglevel (%d,%d) created",
437 lue->attr.name, lue->attr.loglevel_type,
438 lue->attr.loglevel);
284d8f55 439
97ee3a89
DG
440 return lue;
441
44844c29
MD
442error_free_event:
443 free(lue);
97ee3a89 444error:
49d21f93
MD
445 free(filter_expression);
446 free(filter);
447 free(exclusion);
97ee3a89
DG
448 return NULL;
449}
450
aa3514e9
MD
451static
452int trace_ust_context_type_event_to_ust(enum lttng_event_context_type type)
55cc08a6 453{
aa3514e9 454 int utype;
0525e9ae 455
aa3514e9 456 switch (type) {
9197c5c4
MD
457 case LTTNG_EVENT_CONTEXT_VTID:
458 utype = LTTNG_UST_CONTEXT_VTID;
459 break;
460 case LTTNG_EVENT_CONTEXT_VPID:
461 utype = LTTNG_UST_CONTEXT_VPID;
462 break;
463 case LTTNG_EVENT_CONTEXT_PTHREAD_ID:
464 utype = LTTNG_UST_CONTEXT_PTHREAD_ID;
465 break;
466 case LTTNG_EVENT_CONTEXT_PROCNAME:
467 utype = LTTNG_UST_CONTEXT_PROCNAME;
468 break;
7c612c2e
WP
469 case LTTNG_EVENT_CONTEXT_IP:
470 utype = LTTNG_UST_CONTEXT_IP;
471 break;
aa3514e9
MD
472 case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER:
473 utype = LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER;
474 break;
9197c5c4
MD
475 default:
476 ERR("Invalid UST context");
aa3514e9
MD
477 utype = -1;
478 break;
479 }
480 return utype;
481}
482
483/*
484 * Return 1 if contexts match, 0 otherwise.
485 */
486int trace_ust_match_context(struct ltt_ust_context *uctx,
487 struct lttng_event_context *ctx)
488{
489 int utype;
490
491 utype = trace_ust_context_type_event_to_ust(ctx->ctx);
492 if (utype < 0) {
493 return 0;
494 }
495 if (uctx->ctx.ctx != utype) {
496 return 0;
497 }
498 switch (utype) {
499 case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER:
500 if (uctx->ctx.u.perf_counter.type
501 != ctx->u.perf_counter.type) {
502 return 0;
503 }
504 if (uctx->ctx.u.perf_counter.config
505 != ctx->u.perf_counter.config) {
506 return 0;
507 }
508 if (strncmp(uctx->ctx.u.perf_counter.name,
509 ctx->u.perf_counter.name,
510 LTTNG_UST_SYM_NAME_LEN)) {
511 return 0;
512 }
513 break;
514 default:
515 break;
516
517 }
518 return 1;
519}
520
521/*
522 * Allocate and initialize an UST context.
523 *
524 * Return pointer to structure or NULL.
525 */
526struct ltt_ust_context *trace_ust_create_context(
527 struct lttng_event_context *ctx)
528{
529 struct ltt_ust_context *uctx;
530 int utype;
531
532 assert(ctx);
533
534 utype = trace_ust_context_type_event_to_ust(ctx->ctx);
535 if (utype < 0) {
9197c5c4
MD
536 return NULL;
537 }
55cc08a6
DG
538
539 uctx = zmalloc(sizeof(struct ltt_ust_context));
540 if (uctx == NULL) {
541 PERROR("zmalloc ltt_ust_context");
542 goto error;
543 }
544
aa3514e9
MD
545 uctx->ctx.ctx = (enum lttng_ust_context_type) utype;
546 switch (utype) {
547 case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER:
548 uctx->ctx.u.perf_counter.type = ctx->u.perf_counter.type;
549 uctx->ctx.u.perf_counter.config = ctx->u.perf_counter.config;
550 strncpy(uctx->ctx.u.perf_counter.name, ctx->u.perf_counter.name,
551 LTTNG_UST_SYM_NAME_LEN);
552 uctx->ctx.u.perf_counter.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
553 break;
554 default:
555 break;
556 }
bec39940 557 lttng_ht_node_init_ulong(&uctx->node, (unsigned long) uctx->ctx.ctx);
55cc08a6
DG
558
559 return uctx;
560
561error:
562 return NULL;
563}
564
f6a9efaa
DG
565/*
566 * RCU safe free context structure.
567 */
568static void destroy_context_rcu(struct rcu_head *head)
569{
bec39940
DG
570 struct lttng_ht_node_ulong *node =
571 caa_container_of(head, struct lttng_ht_node_ulong, head);
f6a9efaa
DG
572 struct ltt_ust_context *ctx =
573 caa_container_of(node, struct ltt_ust_context, node);
574
575 free(ctx);
576}
577
578/*
579 * Cleanup UST context hash table.
580 */
7bd39047 581static void destroy_contexts(struct lttng_ht *ht)
f6a9efaa
DG
582{
583 int ret;
bec39940
DG
584 struct lttng_ht_node_ulong *node;
585 struct lttng_ht_iter iter;
31746f93 586 struct ltt_ust_context *ctx;
f6a9efaa 587
0525e9ae
DG
588 assert(ht);
589
36b588ed 590 rcu_read_lock();
bec39940 591 cds_lfht_for_each_entry(ht->ht, &iter.iter, node, node) {
31746f93
DG
592 /* Remove from ordered list. */
593 ctx = caa_container_of(node, struct ltt_ust_context, node);
594 cds_list_del(&ctx->list);
595 /* Remove from channel's hash table. */
bec39940 596 ret = lttng_ht_del(ht, &iter);
f6a9efaa
DG
597 if (!ret) {
598 call_rcu(&node->head, destroy_context_rcu);
599 }
f6a9efaa 600 }
36b588ed 601 rcu_read_unlock();
ed52805d 602
0b2dc8df 603 ht_cleanup_push(ht);
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604}
605
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606/*
607 * Cleanup ust event structure.
608 */
609void trace_ust_destroy_event(struct ltt_ust_event *event)
610{
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611 assert(event);
612
f6a9efaa 613 DBG2("Trace destroy UST event %s", event->attr.name);
6b453b5e 614 free(event->filter_expression);
53a80697 615 free(event->filter);
40024f8a 616 free(event->exclusion);
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617 free(event);
618}
619
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620/*
621 * URCU intermediate call to complete destroy event.
622 */
623static void destroy_event_rcu(struct rcu_head *head)
624{
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625 struct lttng_ht_node_str *node =
626 caa_container_of(head, struct lttng_ht_node_str, head);
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627 struct ltt_ust_event *event =
628 caa_container_of(node, struct ltt_ust_event, node);
629
630 trace_ust_destroy_event(event);
631}
632
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633/*
634 * Cleanup UST events hashtable.
635 */
7bd39047 636static void destroy_events(struct lttng_ht *events)
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637{
638 int ret;
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639 struct lttng_ht_node_str *node;
640 struct lttng_ht_iter iter;
ed52805d 641
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642 assert(events);
643
36b588ed 644 rcu_read_lock();
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645 cds_lfht_for_each_entry(events->ht, &iter.iter, node, node) {
646 ret = lttng_ht_del(events, &iter);
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647 assert(!ret);
648 call_rcu(&node->head, destroy_event_rcu);
ed52805d 649 }
36b588ed 650 rcu_read_unlock();
ed52805d 651
0b2dc8df 652 ht_cleanup_push(events);
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653}
654
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655/*
656 * Cleanup ust channel structure.
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657 *
658 * Should _NOT_ be called with RCU read lock held.
97ee3a89 659 */
36b588ed 660static void _trace_ust_destroy_channel(struct ltt_ust_channel *channel)
97ee3a89 661{
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662 assert(channel);
663
f6a9efaa 664 DBG2("Trace destroy UST channel %s", channel->name);
97ee3a89 665
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666 /* Destroying all events of the channel */
667 destroy_events(channel->events);
668 /* Destroying all context of the channel */
669 destroy_contexts(channel->ctx);
97ee3a89 670
97ee3a89 671 free(channel);
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672}
673
674/*
675 * URCU intermediate call to complete destroy channel.
676 */
677static void destroy_channel_rcu(struct rcu_head *head)
678{
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679 struct lttng_ht_node_str *node =
680 caa_container_of(head, struct lttng_ht_node_str, head);
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681 struct ltt_ust_channel *channel =
682 caa_container_of(node, struct ltt_ust_channel, node);
683
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684 _trace_ust_destroy_channel(channel);
685}
686
687void trace_ust_destroy_channel(struct ltt_ust_channel *channel)
688{
689 call_rcu(&channel->node.head, destroy_channel_rcu);
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690}
691
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692/*
693 * Remove an UST channel from a channel HT.
694 */
695void trace_ust_delete_channel(struct lttng_ht *ht,
696 struct ltt_ust_channel *channel)
697{
698 int ret;
699 struct lttng_ht_iter iter;
700
701 assert(ht);
702 assert(channel);
703
704 iter.iter.node = &channel->node.node;
705 ret = lttng_ht_del(ht, &iter);
706 assert(!ret);
707}
708
97ee3a89 709/*
f6a9efaa 710 * Iterate over a hash table containing channels and cleanup safely.
97ee3a89 711 */
bec39940 712static void destroy_channels(struct lttng_ht *channels)
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713{
714 int ret;
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715 struct lttng_ht_node_str *node;
716 struct lttng_ht_iter iter;
f6a9efaa 717
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718 assert(channels);
719
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720 rcu_read_lock();
721
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722 cds_lfht_for_each_entry(channels->ht, &iter.iter, node, node) {
723 ret = lttng_ht_del(channels, &iter);
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724 assert(!ret);
725 call_rcu(&node->head, destroy_channel_rcu);
f6a9efaa 726 }
36b588ed 727 rcu_read_unlock();
ed52805d 728
0b2dc8df 729 ht_cleanup_push(channels);
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730}
731
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732/*
733 * Cleanup UST global domain.
734 */
735static void destroy_domain_global(struct ltt_ust_domain_global *dom)
736{
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737 assert(dom);
738
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739 destroy_channels(dom->channels);
740}
97ee3a89 741
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742/*
743 * Cleanup ust session structure
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744 *
745 * Should *NOT* be called with RCU read-side lock held.
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746 */
747void trace_ust_destroy_session(struct ltt_ust_session *session)
748{
fefd409b 749 struct agent *agt;
7972aab2 750 struct buffer_reg_uid *reg, *sreg;
fefd409b 751 struct lttng_ht_iter iter;
7972aab2 752
0525e9ae 753 assert(session);
97ee3a89 754
d9bf3ca4 755 DBG2("Trace UST destroy session %" PRIu64, session->id);
f6a9efaa 756
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757 /* Cleaning up UST domain */
758 destroy_domain_global(&session->domain_global);
fefd409b 759
0c0fcd77 760 rcu_read_lock();
fefd409b 761 cds_lfht_for_each_entry(session->agents->ht, &iter.iter, agt, node.node) {
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762 int ret = lttng_ht_del(session->agents, &iter);
763
764 assert(!ret);
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765 agent_destroy(agt);
766 }
0c0fcd77 767 rcu_read_unlock();
7972aab2 768
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769 ht_cleanup_push(session->agents);
770
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771 /* Cleanup UID buffer registry object(s). */
772 cds_list_for_each_entry_safe(reg, sreg, &session->buffer_reg_uid_list,
773 lnode) {
774 cds_list_del(&reg->lnode);
775 buffer_reg_uid_remove(reg);
776 buffer_reg_uid_destroy(reg, session->consumer);
777 }
44d3bd01 778
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779 consumer_destroy_output(session->consumer);
780 consumer_destroy_output(session->tmp_consumer);
781
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782 free(session);
783}
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