Fix: syscall list ioctl number conflict
[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
DG
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
fefd409b
DG
202/*
203 * Lookup an agent in the session agents hash table by domain type and return
204 * the object if found else NULL.
205 */
206struct agent *trace_ust_find_agent(struct ltt_ust_session *session,
207 enum lttng_domain_type domain_type)
208{
209 struct agent *agt = NULL;
210 struct lttng_ht_node_u64 *node;
211 struct lttng_ht_iter iter;
212 uint64_t key;
213
214 assert(session);
215
216 DBG3("Trace ust agent lookup for domain %d", domain_type);
217
218 key = domain_type;
219
220 lttng_ht_lookup(session->agents, &key, &iter);
221 node = lttng_ht_iter_get_node_u64(&iter);
222 if (!node) {
223 goto end;
224 }
225 agt = caa_container_of(node, struct agent, node);
226
227end:
228 return agt;
229}
230
97ee3a89
DG
231/*
232 * Allocate and initialize a ust session data structure.
233 *
234 * Return pointer to structure or NULL.
235 */
d9bf3ca4 236struct ltt_ust_session *trace_ust_create_session(uint64_t session_id)
97ee3a89
DG
237{
238 struct ltt_ust_session *lus;
239
240 /* Allocate a new ltt ust session */
ba7f0ae5 241 lus = zmalloc(sizeof(struct ltt_ust_session));
97ee3a89 242 if (lus == NULL) {
ba7f0ae5 243 PERROR("create ust session zmalloc");
97ee3a89
DG
244 goto error;
245 }
246
247 /* Init data structure */
a991f516 248 lus->id = session_id;
14fb1ebe 249 lus->active = 0;
97ee3a89 250
84ad93e8
DG
251 /* Set default metadata channel attribute. */
252 lus->metadata_attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
253 lus->metadata_attr.subbuf_size = default_get_metadata_subbuf_size();
254 lus->metadata_attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
255 lus->metadata_attr.switch_timer_interval = DEFAULT_METADATA_SWITCH_TIMER;
256 lus->metadata_attr.read_timer_interval = DEFAULT_METADATA_READ_TIMER;
257 lus->metadata_attr.output = LTTNG_UST_MMAP;
258
7972aab2
DG
259 /*
260 * Default buffer type. This can be changed through an enable channel
261 * requesting a different type. Note that this can only be changed once
262 * during the session lifetime which is at the first enable channel and
263 * only before start. The flag buffer_type_changed indicates the status.
264 */
8692d4e5 265 lus->buffer_type = LTTNG_BUFFER_PER_UID;
7972aab2
DG
266 /* Once set to 1, the buffer_type is immutable for the session. */
267 lus->buffer_type_changed = 0;
268 /* Init it in case it get used after allocation. */
269 CDS_INIT_LIST_HEAD(&lus->buffer_reg_uid_list);
f6a9efaa
DG
270
271 /* Alloc UST global domain channels' HT */
bec39940 272 lus->domain_global.channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
fefd409b
DG
273 /* Alloc agent hash table. */
274 lus->agents = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
44d3bd01 275
00e2e675
DG
276 lus->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
277 if (lus->consumer == NULL) {
09a90bcd 278 goto error_consumer;
00e2e675
DG
279 }
280
281 /*
282 * The tmp_consumer stays NULL until a set_consumer_uri command is
283 * executed. At this point, the consumer should be nullify until an
284 * enable_consumer command. This assignment is symbolic since we've zmalloc
285 * the struct.
286 */
287 lus->tmp_consumer = NULL;
288
44d3bd01
DG
289 DBG2("UST trace session create successful");
290
97ee3a89
DG
291 return lus;
292
09a90bcd 293error_consumer:
0b2dc8df 294 ht_cleanup_push(lus->domain_global.channels);
fefd409b 295 ht_cleanup_push(lus->agents);
44844c29 296 free(lus);
97ee3a89
DG
297error:
298 return NULL;
299}
300
301/*
302 * Allocate and initialize a ust channel data structure.
303 *
304 * Return pointer to structure or NULL.
305 */
dec56f6c 306struct ltt_ust_channel *trace_ust_create_channel(struct lttng_channel *chan)
97ee3a89 307{
97ee3a89
DG
308 struct ltt_ust_channel *luc;
309
0525e9ae 310 assert(chan);
0525e9ae 311
37357452 312 luc = zmalloc(sizeof(struct ltt_ust_channel));
97ee3a89 313 if (luc == NULL) {
df0f840b 314 PERROR("ltt_ust_channel zmalloc");
97ee3a89
DG
315 goto error;
316 }
317
44d3bd01 318 /* Copy UST channel attributes */
48842b30
DG
319 luc->attr.overwrite = chan->attr.overwrite;
320 luc->attr.subbuf_size = chan->attr.subbuf_size;
321 luc->attr.num_subbuf = chan->attr.num_subbuf;
322 luc->attr.switch_timer_interval = chan->attr.switch_timer_interval;
323 luc->attr.read_timer_interval = chan->attr.read_timer_interval;
6775595e 324 luc->attr.output = (enum lttng_ust_output) chan->attr.output;
44d3bd01
DG
325
326 /* Translate to UST output enum */
327 switch (luc->attr.output) {
328 default:
329 luc->attr.output = LTTNG_UST_MMAP;
330 break;
97ee3a89 331 }
97ee3a89 332
85076754
MD
333 /*
334 * If we receive an empty string for channel name, it means the
335 * default channel name is requested.
336 */
337 if (chan->name[0] == '\0') {
338 strncpy(luc->name, DEFAULT_CHANNEL_NAME, sizeof(luc->name));
339 } else {
340 /* Copy channel name */
341 strncpy(luc->name, chan->name, sizeof(luc->name));
342 }
97ee3a89
DG
343 luc->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
344
f6a9efaa 345 /* Init node */
bec39940 346 lttng_ht_node_init_str(&luc->node, luc->name);
31746f93
DG
347 CDS_INIT_LIST_HEAD(&luc->ctx_list);
348
f6a9efaa 349 /* Alloc hash tables */
bec39940
DG
350 luc->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
351 luc->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
f6a9efaa 352
1624d5b7
JD
353 /* On-disk circular buffer parameters */
354 luc->tracefile_size = chan->attr.tracefile_size;
355 luc->tracefile_count = chan->attr.tracefile_count;
356
f6a9efaa
DG
357 DBG2("Trace UST channel %s created", luc->name);
358
97ee3a89 359error:
7972aab2 360 return luc;
97ee3a89
DG
361}
362
363/*
364 * Allocate and initialize a ust event. Set name and event type.
365 *
366 * Return pointer to structure or NULL.
367 */
025faf73 368struct ltt_ust_event *trace_ust_create_event(struct lttng_event *ev,
6b453b5e 369 char *filter_expression,
561c6897
JI
370 struct lttng_filter_bytecode *filter,
371 struct lttng_event_exclusion *exclusion)
97ee3a89
DG
372{
373 struct ltt_ust_event *lue;
97ee3a89 374
0525e9ae
DG
375 assert(ev);
376
37357452 377 lue = zmalloc(sizeof(struct ltt_ust_event));
44d3bd01 378 if (lue == NULL) {
ba7f0ae5 379 PERROR("ust event zmalloc");
97ee3a89
DG
380 goto error;
381 }
382
383 switch (ev->type) {
384 case LTTNG_EVENT_PROBE:
44d3bd01 385 lue->attr.instrumentation = LTTNG_UST_PROBE;
97ee3a89
DG
386 break;
387 case LTTNG_EVENT_FUNCTION:
44d3bd01 388 lue->attr.instrumentation = LTTNG_UST_FUNCTION;
97ee3a89
DG
389 break;
390 case LTTNG_EVENT_FUNCTION_ENTRY:
44d3bd01 391 lue->attr.instrumentation = LTTNG_UST_FUNCTION;
97ee3a89
DG
392 break;
393 case LTTNG_EVENT_TRACEPOINT:
44d3bd01 394 lue->attr.instrumentation = LTTNG_UST_TRACEPOINT;
97ee3a89
DG
395 break;
396 default:
397 ERR("Unknown ust instrumentation type (%d)", ev->type);
44844c29 398 goto error_free_event;
97ee3a89
DG
399 }
400
401 /* Copy event name */
44d3bd01
DG
402 strncpy(lue->attr.name, ev->name, LTTNG_UST_SYM_NAME_LEN);
403 lue->attr.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
97ee3a89 404
0cda4f28 405 switch (ev->loglevel_type) {
8005f29a
MD
406 case LTTNG_EVENT_LOGLEVEL_ALL:
407 lue->attr.loglevel_type = LTTNG_UST_LOGLEVEL_ALL;
22e25b71 408 lue->attr.loglevel = -1; /* Force to -1 */
0cda4f28 409 break;
8005f29a
MD
410 case LTTNG_EVENT_LOGLEVEL_RANGE:
411 lue->attr.loglevel_type = LTTNG_UST_LOGLEVEL_RANGE;
22e25b71 412 lue->attr.loglevel = ev->loglevel;
8005f29a
MD
413 break;
414 case LTTNG_EVENT_LOGLEVEL_SINGLE:
415 lue->attr.loglevel_type = LTTNG_UST_LOGLEVEL_SINGLE;
22e25b71 416 lue->attr.loglevel = ev->loglevel;
0cda4f28
MD
417 break;
418 default:
4431494b 419 ERR("Unknown ust loglevel type (%d)", ev->loglevel_type);
0cda4f28
MD
420 goto error_free_event;
421 }
422
025faf73 423 /* Same layout. */
6b453b5e 424 lue->filter_expression = filter_expression;
025faf73 425 lue->filter = (struct lttng_ust_filter_bytecode *) filter;
561c6897 426 lue->exclusion = (struct lttng_event_exclusion *) exclusion;
0cda4f28 427
f6a9efaa 428 /* Init node */
bec39940 429 lttng_ht_node_init_str(&lue->node, lue->attr.name);
97ee3a89 430
300b8fd5
MD
431 DBG2("Trace UST event %s, loglevel (%d,%d) created",
432 lue->attr.name, lue->attr.loglevel_type,
433 lue->attr.loglevel);
284d8f55 434
97ee3a89
DG
435 return lue;
436
44844c29
MD
437error_free_event:
438 free(lue);
97ee3a89
DG
439error:
440 return NULL;
441}
442
aa3514e9
MD
443static
444int trace_ust_context_type_event_to_ust(enum lttng_event_context_type type)
55cc08a6 445{
aa3514e9 446 int utype;
0525e9ae 447
aa3514e9 448 switch (type) {
9197c5c4
MD
449 case LTTNG_EVENT_CONTEXT_VTID:
450 utype = LTTNG_UST_CONTEXT_VTID;
451 break;
452 case LTTNG_EVENT_CONTEXT_VPID:
453 utype = LTTNG_UST_CONTEXT_VPID;
454 break;
455 case LTTNG_EVENT_CONTEXT_PTHREAD_ID:
456 utype = LTTNG_UST_CONTEXT_PTHREAD_ID;
457 break;
458 case LTTNG_EVENT_CONTEXT_PROCNAME:
459 utype = LTTNG_UST_CONTEXT_PROCNAME;
460 break;
7c612c2e
WP
461 case LTTNG_EVENT_CONTEXT_IP:
462 utype = LTTNG_UST_CONTEXT_IP;
463 break;
aa3514e9
MD
464 case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER:
465 utype = LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER;
466 break;
9197c5c4
MD
467 default:
468 ERR("Invalid UST context");
aa3514e9
MD
469 utype = -1;
470 break;
471 }
472 return utype;
473}
474
475/*
476 * Return 1 if contexts match, 0 otherwise.
477 */
478int trace_ust_match_context(struct ltt_ust_context *uctx,
479 struct lttng_event_context *ctx)
480{
481 int utype;
482
483 utype = trace_ust_context_type_event_to_ust(ctx->ctx);
484 if (utype < 0) {
485 return 0;
486 }
487 if (uctx->ctx.ctx != utype) {
488 return 0;
489 }
490 switch (utype) {
491 case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER:
492 if (uctx->ctx.u.perf_counter.type
493 != ctx->u.perf_counter.type) {
494 return 0;
495 }
496 if (uctx->ctx.u.perf_counter.config
497 != ctx->u.perf_counter.config) {
498 return 0;
499 }
500 if (strncmp(uctx->ctx.u.perf_counter.name,
501 ctx->u.perf_counter.name,
502 LTTNG_UST_SYM_NAME_LEN)) {
503 return 0;
504 }
505 break;
506 default:
507 break;
508
509 }
510 return 1;
511}
512
513/*
514 * Allocate and initialize an UST context.
515 *
516 * Return pointer to structure or NULL.
517 */
518struct ltt_ust_context *trace_ust_create_context(
519 struct lttng_event_context *ctx)
520{
521 struct ltt_ust_context *uctx;
522 int utype;
523
524 assert(ctx);
525
526 utype = trace_ust_context_type_event_to_ust(ctx->ctx);
527 if (utype < 0) {
9197c5c4
MD
528 return NULL;
529 }
55cc08a6
DG
530
531 uctx = zmalloc(sizeof(struct ltt_ust_context));
532 if (uctx == NULL) {
533 PERROR("zmalloc ltt_ust_context");
534 goto error;
535 }
536
aa3514e9
MD
537 uctx->ctx.ctx = (enum lttng_ust_context_type) utype;
538 switch (utype) {
539 case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER:
540 uctx->ctx.u.perf_counter.type = ctx->u.perf_counter.type;
541 uctx->ctx.u.perf_counter.config = ctx->u.perf_counter.config;
542 strncpy(uctx->ctx.u.perf_counter.name, ctx->u.perf_counter.name,
543 LTTNG_UST_SYM_NAME_LEN);
544 uctx->ctx.u.perf_counter.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
545 break;
546 default:
547 break;
548 }
bec39940 549 lttng_ht_node_init_ulong(&uctx->node, (unsigned long) uctx->ctx.ctx);
55cc08a6
DG
550
551 return uctx;
552
553error:
554 return NULL;
555}
556
f6a9efaa
DG
557/*
558 * RCU safe free context structure.
559 */
560static void destroy_context_rcu(struct rcu_head *head)
561{
bec39940
DG
562 struct lttng_ht_node_ulong *node =
563 caa_container_of(head, struct lttng_ht_node_ulong, head);
f6a9efaa
DG
564 struct ltt_ust_context *ctx =
565 caa_container_of(node, struct ltt_ust_context, node);
566
567 free(ctx);
568}
569
570/*
571 * Cleanup UST context hash table.
572 */
7bd39047 573static void destroy_contexts(struct lttng_ht *ht)
f6a9efaa
DG
574{
575 int ret;
bec39940
DG
576 struct lttng_ht_node_ulong *node;
577 struct lttng_ht_iter iter;
31746f93 578 struct ltt_ust_context *ctx;
f6a9efaa 579
0525e9ae
DG
580 assert(ht);
581
36b588ed 582 rcu_read_lock();
bec39940 583 cds_lfht_for_each_entry(ht->ht, &iter.iter, node, node) {
31746f93
DG
584 /* Remove from ordered list. */
585 ctx = caa_container_of(node, struct ltt_ust_context, node);
586 cds_list_del(&ctx->list);
587 /* Remove from channel's hash table. */
bec39940 588 ret = lttng_ht_del(ht, &iter);
f6a9efaa
DG
589 if (!ret) {
590 call_rcu(&node->head, destroy_context_rcu);
591 }
f6a9efaa 592 }
36b588ed 593 rcu_read_unlock();
ed52805d 594
0b2dc8df 595 ht_cleanup_push(ht);
f6a9efaa
DG
596}
597
97ee3a89
DG
598/*
599 * Cleanup ust event structure.
600 */
601void trace_ust_destroy_event(struct ltt_ust_event *event)
602{
0525e9ae
DG
603 assert(event);
604
f6a9efaa 605 DBG2("Trace destroy UST event %s", event->attr.name);
6b453b5e 606 free(event->filter_expression);
53a80697 607 free(event->filter);
40024f8a 608 free(event->exclusion);
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609 free(event);
610}
611
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612/*
613 * URCU intermediate call to complete destroy event.
614 */
615static void destroy_event_rcu(struct rcu_head *head)
616{
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617 struct lttng_ht_node_str *node =
618 caa_container_of(head, struct lttng_ht_node_str, head);
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619 struct ltt_ust_event *event =
620 caa_container_of(node, struct ltt_ust_event, node);
621
622 trace_ust_destroy_event(event);
623}
624
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625/*
626 * Cleanup UST events hashtable.
627 */
7bd39047 628static void destroy_events(struct lttng_ht *events)
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629{
630 int ret;
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631 struct lttng_ht_node_str *node;
632 struct lttng_ht_iter iter;
ed52805d 633
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634 assert(events);
635
36b588ed 636 rcu_read_lock();
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637 cds_lfht_for_each_entry(events->ht, &iter.iter, node, node) {
638 ret = lttng_ht_del(events, &iter);
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639 assert(!ret);
640 call_rcu(&node->head, destroy_event_rcu);
ed52805d 641 }
36b588ed 642 rcu_read_unlock();
ed52805d 643
0b2dc8df 644 ht_cleanup_push(events);
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645}
646
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647/*
648 * Cleanup ust channel structure.
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649 *
650 * Should _NOT_ be called with RCU read lock held.
97ee3a89 651 */
36b588ed 652static void _trace_ust_destroy_channel(struct ltt_ust_channel *channel)
97ee3a89 653{
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654 assert(channel);
655
f6a9efaa 656 DBG2("Trace destroy UST channel %s", channel->name);
97ee3a89 657
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658 /* Destroying all events of the channel */
659 destroy_events(channel->events);
660 /* Destroying all context of the channel */
661 destroy_contexts(channel->ctx);
97ee3a89 662
97ee3a89 663 free(channel);
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664}
665
666/*
667 * URCU intermediate call to complete destroy channel.
668 */
669static void destroy_channel_rcu(struct rcu_head *head)
670{
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671 struct lttng_ht_node_str *node =
672 caa_container_of(head, struct lttng_ht_node_str, head);
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673 struct ltt_ust_channel *channel =
674 caa_container_of(node, struct ltt_ust_channel, node);
675
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676 _trace_ust_destroy_channel(channel);
677}
678
679void trace_ust_destroy_channel(struct ltt_ust_channel *channel)
680{
681 call_rcu(&channel->node.head, destroy_channel_rcu);
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682}
683
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684/*
685 * Remove an UST channel from a channel HT.
686 */
687void trace_ust_delete_channel(struct lttng_ht *ht,
688 struct ltt_ust_channel *channel)
689{
690 int ret;
691 struct lttng_ht_iter iter;
692
693 assert(ht);
694 assert(channel);
695
696 iter.iter.node = &channel->node.node;
697 ret = lttng_ht_del(ht, &iter);
698 assert(!ret);
699}
700
97ee3a89 701/*
f6a9efaa 702 * Iterate over a hash table containing channels and cleanup safely.
97ee3a89 703 */
bec39940 704static void destroy_channels(struct lttng_ht *channels)
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705{
706 int ret;
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707 struct lttng_ht_node_str *node;
708 struct lttng_ht_iter iter;
f6a9efaa 709
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710 assert(channels);
711
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712 rcu_read_lock();
713
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714 cds_lfht_for_each_entry(channels->ht, &iter.iter, node, node) {
715 ret = lttng_ht_del(channels, &iter);
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716 assert(!ret);
717 call_rcu(&node->head, destroy_channel_rcu);
f6a9efaa 718 }
36b588ed 719 rcu_read_unlock();
ed52805d 720
0b2dc8df 721 ht_cleanup_push(channels);
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722}
723
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724/*
725 * Cleanup UST global domain.
726 */
727static void destroy_domain_global(struct ltt_ust_domain_global *dom)
728{
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729 assert(dom);
730
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731 destroy_channels(dom->channels);
732}
97ee3a89 733
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734/*
735 * Cleanup ust session structure
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736 *
737 * Should *NOT* be called with RCU read-side lock held.
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738 */
739void trace_ust_destroy_session(struct ltt_ust_session *session)
740{
fefd409b 741 struct agent *agt;
7972aab2 742 struct buffer_reg_uid *reg, *sreg;
fefd409b 743 struct lttng_ht_iter iter;
7972aab2 744
0525e9ae 745 assert(session);
97ee3a89 746
d9bf3ca4 747 DBG2("Trace UST destroy session %" PRIu64, session->id);
f6a9efaa 748
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749 /* Cleaning up UST domain */
750 destroy_domain_global(&session->domain_global);
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751
752 cds_lfht_for_each_entry(session->agents->ht, &iter.iter, agt, node.node) {
753 lttng_ht_del(session->agents, &iter);
754 agent_destroy(agt);
755 }
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756
757 /* Cleanup UID buffer registry object(s). */
758 cds_list_for_each_entry_safe(reg, sreg, &session->buffer_reg_uid_list,
759 lnode) {
760 cds_list_del(&reg->lnode);
761 buffer_reg_uid_remove(reg);
762 buffer_reg_uid_destroy(reg, session->consumer);
763 }
44d3bd01 764
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765 consumer_destroy_output(session->consumer);
766 consumer_destroy_output(session->tmp_consumer);
767
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768 free(session);
769}
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