Commit | Line | Data |
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d0b96690 DG |
1 | /* |
2 | * Copyright (C) 2013 - David Goulet <dgoulet@efficios.com> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License, version 2 only, as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
15 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
16 | */ | |
17 | #define _GNU_SOURCE | |
18 | #include <assert.h> | |
7972aab2 | 19 | #include <inttypes.h> |
d0b96690 DG |
20 | |
21 | #include <common/common.h> | |
7972aab2 DG |
22 | #include <common/hashtable/utils.h> |
23 | #include <lttng/lttng.h> | |
24 | ||
d0b96690 | 25 | #include "ust-registry.h" |
8494bda5 | 26 | #include "ust-app.h" |
0b2dc8df | 27 | #include "utils.h" |
d0b96690 DG |
28 | |
29 | /* | |
30 | * Hash table match function for event in the registry. | |
31 | */ | |
32 | static int ht_match_event(struct cds_lfht_node *node, const void *_key) | |
33 | { | |
34 | struct ust_registry_event *event; | |
35 | const struct ust_registry_event *key; | |
36 | ||
37 | assert(node); | |
38 | assert(_key); | |
39 | ||
40 | event = caa_container_of(node, struct ust_registry_event, node.node); | |
41 | assert(event); | |
42 | key = _key; | |
43 | ||
44 | /* It has to be a perfect match. */ | |
45 | if (strncmp(event->name, key->name, sizeof(event->name)) != 0) { | |
46 | goto no_match; | |
47 | } | |
48 | ||
49 | /* It has to be a perfect match. */ | |
50 | if (strncmp(event->signature, key->signature, | |
51 | strlen(event->signature) != 0)) { | |
52 | goto no_match; | |
53 | } | |
54 | ||
55 | /* Match */ | |
56 | return 1; | |
57 | ||
58 | no_match: | |
59 | return 0; | |
60 | } | |
61 | ||
7972aab2 DG |
62 | static unsigned long ht_hash_event(void *_key, unsigned long seed) |
63 | { | |
64 | uint64_t xored_key; | |
65 | struct ust_registry_event *key = _key; | |
66 | ||
67 | assert(key); | |
68 | ||
69 | xored_key = (uint64_t) (hash_key_str(key->name, seed) ^ | |
70 | hash_key_str(key->signature, seed)); | |
71 | ||
72 | return hash_key_u64(&xored_key, seed); | |
73 | } | |
74 | ||
8494bda5 MD |
75 | /* |
76 | * Return negative value on error, 0 if OK. | |
77 | * | |
78 | * TODO: we could add stricter verification of more types to catch | |
79 | * errors in liblttng-ust implementation earlier than consumption by the | |
80 | * trace reader. | |
81 | */ | |
82 | static | |
83 | int validate_event_field(struct ustctl_field *field, | |
84 | const char *event_name, | |
85 | struct ust_app *app) | |
86 | { | |
87 | switch(field->type.atype) { | |
88 | case ustctl_atype_integer: | |
89 | case ustctl_atype_enum: | |
90 | case ustctl_atype_array: | |
91 | case ustctl_atype_sequence: | |
92 | case ustctl_atype_string: | |
93 | break; | |
94 | ||
95 | case ustctl_atype_float: | |
96 | switch (field->type.u.basic._float.mant_dig) { | |
97 | case 0: | |
98 | WARN("UST application '%s' (pid: %d) has unknown float mantissa '%u' " | |
99 | "in field '%s', rejecting event '%s'", | |
100 | app->name, app->pid, | |
101 | field->type.u.basic._float.mant_dig, | |
102 | field->name, | |
103 | event_name); | |
104 | return -EINVAL; | |
105 | default: | |
106 | break; | |
107 | } | |
108 | break; | |
109 | ||
110 | default: | |
111 | return -ENOENT; | |
112 | } | |
113 | return 0; | |
114 | } | |
115 | ||
116 | static | |
117 | int validate_event_fields(size_t nr_fields, struct ustctl_field *fields, | |
118 | const char *event_name, struct ust_app *app) | |
119 | { | |
120 | unsigned int i; | |
121 | ||
122 | for (i = 0; i < nr_fields; i++) { | |
123 | if (validate_event_field(&fields[i], event_name, app) < 0) | |
124 | return -EINVAL; | |
125 | } | |
126 | return 0; | |
127 | } | |
128 | ||
d0b96690 DG |
129 | /* |
130 | * Allocate event and initialize it. This does NOT set a valid event id from a | |
131 | * registry. | |
132 | */ | |
133 | static struct ust_registry_event *alloc_event(int session_objd, | |
134 | int channel_objd, char *name, char *sig, size_t nr_fields, | |
8494bda5 MD |
135 | struct ustctl_field *fields, int loglevel, char *model_emf_uri, |
136 | struct ust_app *app) | |
d0b96690 DG |
137 | { |
138 | struct ust_registry_event *event = NULL; | |
139 | ||
8494bda5 MD |
140 | /* |
141 | * Ensure that the field content is valid. | |
142 | */ | |
143 | if (validate_event_fields(nr_fields, fields, name, app) < 0) { | |
144 | return NULL; | |
145 | } | |
146 | ||
d0b96690 DG |
147 | event = zmalloc(sizeof(*event)); |
148 | if (!event) { | |
149 | PERROR("zmalloc ust registry event"); | |
150 | goto error; | |
151 | } | |
152 | ||
153 | event->session_objd = session_objd; | |
154 | event->channel_objd = channel_objd; | |
155 | /* Allocated by ustctl. */ | |
156 | event->signature = sig; | |
157 | event->nr_fields = nr_fields; | |
158 | event->fields = fields; | |
159 | event->loglevel = loglevel; | |
160 | event->model_emf_uri = model_emf_uri; | |
161 | if (name) { | |
162 | /* Copy event name and force NULL byte. */ | |
163 | strncpy(event->name, name, sizeof(event->name)); | |
164 | event->name[sizeof(event->name) - 1] = '\0'; | |
165 | } | |
7972aab2 | 166 | cds_lfht_node_init(&event->node.node); |
d0b96690 DG |
167 | |
168 | error: | |
169 | return event; | |
170 | } | |
171 | ||
172 | /* | |
173 | * Free event data structure. This does NOT delete it from any hash table. It's | |
174 | * safe to pass a NULL pointer. This shoudl be called inside a call RCU if the | |
175 | * event is previously deleted from a rcu hash table. | |
176 | */ | |
177 | static void destroy_event(struct ust_registry_event *event) | |
178 | { | |
179 | if (!event) { | |
180 | return; | |
181 | } | |
182 | ||
183 | free(event->fields); | |
184 | free(event->model_emf_uri); | |
185 | free(event->signature); | |
186 | free(event); | |
187 | } | |
188 | ||
189 | /* | |
190 | * Destroy event function call of the call RCU. | |
191 | */ | |
192 | static void destroy_event_rcu(struct rcu_head *head) | |
193 | { | |
7972aab2 DG |
194 | struct lttng_ht_node_u64 *node = |
195 | caa_container_of(head, struct lttng_ht_node_u64, head); | |
d0b96690 DG |
196 | struct ust_registry_event *event = |
197 | caa_container_of(node, struct ust_registry_event, node); | |
198 | ||
199 | destroy_event(event); | |
200 | } | |
201 | ||
202 | /* | |
203 | * Find an event using the name and signature in the given registry. RCU read | |
204 | * side lock MUST be acquired before calling this function and as long as the | |
205 | * event reference is kept by the caller. | |
206 | * | |
207 | * On success, the event pointer is returned else NULL. | |
208 | */ | |
209 | struct ust_registry_event *ust_registry_find_event( | |
210 | struct ust_registry_channel *chan, char *name, char *sig) | |
211 | { | |
7972aab2 | 212 | struct lttng_ht_node_u64 *node; |
d0b96690 DG |
213 | struct lttng_ht_iter iter; |
214 | struct ust_registry_event *event = NULL; | |
215 | struct ust_registry_event key; | |
216 | ||
217 | assert(chan); | |
218 | assert(name); | |
219 | assert(sig); | |
220 | ||
221 | /* Setup key for the match function. */ | |
222 | strncpy(key.name, name, sizeof(key.name)); | |
223 | key.name[sizeof(key.name) - 1] = '\0'; | |
224 | key.signature = sig; | |
225 | ||
7972aab2 | 226 | cds_lfht_lookup(chan->ht->ht, chan->ht->hash_fct(&key, lttng_ht_seed), |
d0b96690 | 227 | chan->ht->match_fct, &key, &iter.iter); |
7972aab2 | 228 | node = lttng_ht_iter_get_node_u64(&iter); |
d0b96690 DG |
229 | if (!node) { |
230 | goto end; | |
231 | } | |
232 | event = caa_container_of(node, struct ust_registry_event, node); | |
233 | ||
234 | end: | |
235 | return event; | |
236 | } | |
237 | ||
238 | /* | |
239 | * Create a ust_registry_event from the given parameters and add it to the | |
240 | * registry hash table. If event_id is valid, it is set with the newly created | |
241 | * event id. | |
242 | * | |
243 | * On success, return 0 else a negative value. The created event MUST be unique | |
244 | * so on duplicate entry -EINVAL is returned. On error, event_id is untouched. | |
245 | * | |
246 | * Should be called with session registry mutex held. | |
247 | */ | |
248 | int ust_registry_create_event(struct ust_registry_session *session, | |
45893984 DG |
249 | uint64_t chan_key, int session_objd, int channel_objd, char *name, |
250 | char *sig, size_t nr_fields, struct ustctl_field *fields, int loglevel, | |
8494bda5 MD |
251 | char *model_emf_uri, int buffer_type, uint32_t *event_id_p, |
252 | struct ust_app *app) | |
d0b96690 DG |
253 | { |
254 | int ret; | |
7972aab2 | 255 | uint32_t event_id; |
d0b96690 DG |
256 | struct cds_lfht_node *nptr; |
257 | struct ust_registry_event *event = NULL; | |
45893984 | 258 | struct ust_registry_channel *chan; |
d0b96690 DG |
259 | |
260 | assert(session); | |
d0b96690 DG |
261 | assert(name); |
262 | assert(sig); | |
7972aab2 | 263 | assert(event_id_p); |
d0b96690 | 264 | |
d5d629b5 DG |
265 | rcu_read_lock(); |
266 | ||
d0b96690 DG |
267 | /* |
268 | * This should not happen but since it comes from the UST tracer, an | |
269 | * external party, don't assert and simply validate values. | |
270 | */ | |
271 | if (session_objd < 0 || channel_objd < 0) { | |
272 | ret = -EINVAL; | |
d5d629b5 | 273 | goto error_free; |
d0b96690 DG |
274 | } |
275 | ||
45893984 DG |
276 | chan = ust_registry_channel_find(session, chan_key); |
277 | if (!chan) { | |
278 | ret = -EINVAL; | |
d5d629b5 | 279 | goto error_free; |
45893984 DG |
280 | } |
281 | ||
d0b96690 DG |
282 | /* Check if we've reached the maximum possible id. */ |
283 | if (ust_registry_is_max_id(chan->used_event_id)) { | |
284 | ret = -ENOENT; | |
d5d629b5 | 285 | goto error_free; |
d0b96690 DG |
286 | } |
287 | ||
288 | event = alloc_event(session_objd, channel_objd, name, sig, nr_fields, | |
8494bda5 | 289 | fields, loglevel, model_emf_uri, app); |
d0b96690 DG |
290 | if (!event) { |
291 | ret = -ENOMEM; | |
d5d629b5 | 292 | goto error_free; |
d0b96690 DG |
293 | } |
294 | ||
d0b96690 | 295 | DBG3("UST registry creating event with event: %s, sig: %s, id: %u, " |
7972aab2 DG |
296 | "chan_objd: %u, sess_objd: %u, chan_id: %u", event->name, |
297 | event->signature, event->id, event->channel_objd, | |
298 | event->session_objd, chan->chan_id); | |
d0b96690 | 299 | |
d0b96690 DG |
300 | /* |
301 | * This is an add unique with a custom match function for event. The node | |
302 | * are matched using the event name and signature. | |
303 | */ | |
7972aab2 | 304 | nptr = cds_lfht_add_unique(chan->ht->ht, chan->ht->hash_fct(event, |
d0b96690 DG |
305 | lttng_ht_seed), chan->ht->match_fct, event, &event->node.node); |
306 | if (nptr != &event->node.node) { | |
7972aab2 DG |
307 | if (buffer_type == LTTNG_BUFFER_PER_UID) { |
308 | /* | |
309 | * This is normal, we just have to send the event id of the | |
310 | * returned node and make sure we destroy the previously allocated | |
311 | * event object. | |
312 | */ | |
313 | destroy_event(event); | |
314 | event = caa_container_of(nptr, struct ust_registry_event, | |
315 | node.node); | |
316 | assert(event); | |
317 | event_id = event->id; | |
318 | } else { | |
319 | ERR("UST registry create event add unique failed for event: %s, " | |
320 | "sig: %s, id: %u, chan_objd: %u, sess_objd: %u", | |
321 | event->name, event->signature, event->id, | |
322 | event->channel_objd, event->session_objd); | |
323 | ret = -EINVAL; | |
324 | goto error_unlock; | |
325 | } | |
326 | } else { | |
327 | /* Request next event id if the node was successfully added. */ | |
328 | event_id = event->id = ust_registry_get_next_event_id(chan); | |
d0b96690 DG |
329 | } |
330 | ||
7972aab2 | 331 | *event_id_p = event_id; |
d0b96690 | 332 | |
7972aab2 DG |
333 | if (!event->metadata_dumped) { |
334 | /* Append to metadata */ | |
335 | ret = ust_metadata_event_statedump(session, chan, event); | |
336 | if (ret) { | |
337 | ERR("Error appending event metadata (errno = %d)", ret); | |
338 | rcu_read_unlock(); | |
339 | return ret; | |
340 | } | |
d0b96690 DG |
341 | } |
342 | ||
45893984 | 343 | rcu_read_unlock(); |
d0b96690 DG |
344 | return 0; |
345 | ||
d5d629b5 DG |
346 | error_free: |
347 | free(sig); | |
348 | free(fields); | |
349 | free(model_emf_uri); | |
d0b96690 DG |
350 | error_unlock: |
351 | rcu_read_unlock(); | |
d0b96690 DG |
352 | destroy_event(event); |
353 | return ret; | |
354 | } | |
355 | ||
356 | /* | |
357 | * For a given event in a registry, delete the entry and destroy the event. | |
358 | * This MUST be called within a RCU read side lock section. | |
359 | */ | |
360 | void ust_registry_destroy_event(struct ust_registry_channel *chan, | |
361 | struct ust_registry_event *event) | |
362 | { | |
363 | int ret; | |
364 | struct lttng_ht_iter iter; | |
365 | ||
366 | assert(chan); | |
367 | assert(event); | |
368 | ||
369 | /* Delete the node first. */ | |
370 | iter.iter.node = &event->node.node; | |
371 | ret = lttng_ht_del(chan->ht, &iter); | |
372 | assert(!ret); | |
373 | ||
374 | call_rcu(&event->node.head, destroy_event_rcu); | |
375 | ||
376 | return; | |
377 | } | |
378 | ||
36b588ed MD |
379 | /* |
380 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
381 | * section and outside of call_rcu thread, so we postpone its execution |
382 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
383 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
384 | */ |
385 | static | |
386 | void destroy_channel_rcu(struct rcu_head *head) | |
387 | { | |
388 | struct ust_registry_channel *chan = | |
389 | caa_container_of(head, struct ust_registry_channel, rcu_head); | |
390 | ||
9dbcf332 | 391 | if (chan->ht) { |
0b2dc8df | 392 | ht_cleanup_push(chan->ht); |
9dbcf332 | 393 | } |
3295105b | 394 | free(chan->ctx_fields); |
36b588ed MD |
395 | free(chan); |
396 | } | |
397 | ||
d0b96690 DG |
398 | /* |
399 | * Destroy every element of the registry and free the memory. This does NOT | |
400 | * free the registry pointer since it might not have been allocated before so | |
401 | * it's the caller responsability. | |
d0b96690 | 402 | */ |
45893984 | 403 | static void destroy_channel(struct ust_registry_channel *chan) |
d0b96690 DG |
404 | { |
405 | struct lttng_ht_iter iter; | |
406 | struct ust_registry_event *event; | |
407 | ||
408 | assert(chan); | |
409 | ||
9209cee7 | 410 | rcu_read_lock(); |
d0b96690 DG |
411 | /* Destroy all event associated with this registry. */ |
412 | cds_lfht_for_each_entry(chan->ht->ht, &iter.iter, event, node.node) { | |
413 | /* Delete the node from the ht and free it. */ | |
414 | ust_registry_destroy_event(chan, event); | |
415 | } | |
9209cee7 | 416 | rcu_read_unlock(); |
36b588ed | 417 | call_rcu(&chan->rcu_head, destroy_channel_rcu); |
d0b96690 DG |
418 | } |
419 | ||
420 | /* | |
421 | * Initialize registry with default values. | |
422 | */ | |
45893984 DG |
423 | int ust_registry_channel_add(struct ust_registry_session *session, |
424 | uint64_t key) | |
425 | { | |
426 | int ret = 0; | |
427 | struct ust_registry_channel *chan; | |
428 | ||
429 | assert(session); | |
430 | ||
431 | chan = zmalloc(sizeof(*chan)); | |
432 | if (!chan) { | |
433 | PERROR("zmalloc ust registry channel"); | |
434 | ret = -ENOMEM; | |
9dbcf332 | 435 | goto error_alloc; |
45893984 DG |
436 | } |
437 | ||
438 | chan->ht = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
439 | if (!chan->ht) { | |
440 | ret = -ENOMEM; | |
441 | goto error; | |
442 | } | |
443 | ||
444 | /* Set custom match function. */ | |
445 | chan->ht->match_fct = ht_match_event; | |
7972aab2 DG |
446 | chan->ht->hash_fct = ht_hash_event; |
447 | ||
448 | /* | |
449 | * Assign a channel ID right now since the event notification comes | |
450 | * *before* the channel notify so the ID needs to be set at this point so | |
451 | * the metadata can be dumped for that event. | |
452 | */ | |
453 | if (ust_registry_is_max_id(session->used_channel_id)) { | |
454 | ret = -1; | |
455 | goto error; | |
456 | } | |
457 | chan->chan_id = ust_registry_get_next_chan_id(session); | |
45893984 DG |
458 | |
459 | rcu_read_lock(); | |
460 | lttng_ht_node_init_u64(&chan->node, key); | |
461 | lttng_ht_add_unique_u64(session->channels, &chan->node); | |
462 | rcu_read_unlock(); | |
463 | ||
9dbcf332 DG |
464 | return 0; |
465 | ||
45893984 | 466 | error: |
9dbcf332 DG |
467 | destroy_channel(chan); |
468 | error_alloc: | |
45893984 DG |
469 | return ret; |
470 | } | |
471 | ||
472 | /* | |
473 | * Find a channel in the given registry. RCU read side lock MUST be acquired | |
474 | * before calling this function and as long as the event reference is kept by | |
475 | * the caller. | |
476 | * | |
477 | * On success, the pointer is returned else NULL. | |
478 | */ | |
479 | struct ust_registry_channel *ust_registry_channel_find( | |
480 | struct ust_registry_session *session, uint64_t key) | |
481 | { | |
482 | struct lttng_ht_node_u64 *node; | |
483 | struct lttng_ht_iter iter; | |
484 | struct ust_registry_channel *chan = NULL; | |
485 | ||
486 | assert(session); | |
487 | assert(session->channels); | |
488 | ||
7972aab2 DG |
489 | DBG3("UST registry channel finding key %" PRIu64, key); |
490 | ||
45893984 DG |
491 | lttng_ht_lookup(session->channels, &key, &iter); |
492 | node = lttng_ht_iter_get_node_u64(&iter); | |
493 | if (!node) { | |
494 | goto end; | |
495 | } | |
496 | chan = caa_container_of(node, struct ust_registry_channel, node); | |
497 | ||
498 | end: | |
499 | return chan; | |
500 | } | |
501 | ||
502 | /* | |
503 | * Remove channel using key from registry and free memory. | |
504 | */ | |
505 | void ust_registry_channel_del_free(struct ust_registry_session *session, | |
506 | uint64_t key) | |
507 | { | |
508 | struct lttng_ht_iter iter; | |
509 | struct ust_registry_channel *chan; | |
9209cee7 | 510 | int ret; |
45893984 DG |
511 | |
512 | assert(session); | |
513 | ||
514 | rcu_read_lock(); | |
515 | chan = ust_registry_channel_find(session, key); | |
516 | if (!chan) { | |
9209cee7 | 517 | rcu_read_unlock(); |
45893984 DG |
518 | goto end; |
519 | } | |
520 | ||
521 | iter.iter.node = &chan->node.node; | |
9209cee7 MD |
522 | ret = lttng_ht_del(session->channels, &iter); |
523 | assert(!ret); | |
524 | rcu_read_unlock(); | |
45893984 DG |
525 | destroy_channel(chan); |
526 | ||
527 | end: | |
45893984 DG |
528 | return; |
529 | } | |
530 | ||
531 | /* | |
532 | * Initialize registry with default values and set the newly allocated session | |
533 | * pointer to sessionp. | |
534 | * | |
535 | * Return 0 on success and sessionp is set or else return -1 and sessionp is | |
536 | * kept untouched. | |
537 | */ | |
538 | int ust_registry_session_init(struct ust_registry_session **sessionp, | |
d0b96690 DG |
539 | struct ust_app *app, |
540 | uint32_t bits_per_long, | |
541 | uint32_t uint8_t_alignment, | |
542 | uint32_t uint16_t_alignment, | |
543 | uint32_t uint32_t_alignment, | |
544 | uint32_t uint64_t_alignment, | |
545 | uint32_t long_alignment, | |
af6142cf MD |
546 | int byte_order, |
547 | uint32_t major, | |
548 | uint32_t minor) | |
d0b96690 DG |
549 | { |
550 | int ret; | |
45893984 | 551 | struct ust_registry_session *session; |
d0b96690 | 552 | |
45893984 | 553 | assert(sessionp); |
d0b96690 | 554 | |
45893984 DG |
555 | session = zmalloc(sizeof(*session)); |
556 | if (!session) { | |
557 | PERROR("zmalloc ust registry session"); | |
9dbcf332 | 558 | goto error_alloc; |
45893984 | 559 | } |
d0b96690 DG |
560 | |
561 | pthread_mutex_init(&session->lock, NULL); | |
562 | session->bits_per_long = bits_per_long; | |
563 | session->uint8_t_alignment = uint8_t_alignment; | |
564 | session->uint16_t_alignment = uint16_t_alignment; | |
565 | session->uint32_t_alignment = uint32_t_alignment; | |
566 | session->uint64_t_alignment = uint64_t_alignment; | |
567 | session->long_alignment = long_alignment; | |
568 | session->byte_order = byte_order; | |
569 | ||
45893984 DG |
570 | session->channels = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
571 | if (!session->channels) { | |
572 | goto error; | |
573 | } | |
574 | ||
d0b96690 DG |
575 | ret = lttng_uuid_generate(session->uuid); |
576 | if (ret) { | |
577 | ERR("Failed to generate UST uuid (errno = %d)", ret); | |
578 | goto error; | |
579 | } | |
580 | ||
581 | pthread_mutex_lock(&session->lock); | |
af6142cf | 582 | ret = ust_metadata_session_statedump(session, app, major, minor); |
d0b96690 DG |
583 | pthread_mutex_unlock(&session->lock); |
584 | if (ret) { | |
585 | ERR("Failed to generate session metadata (errno = %d)", ret); | |
586 | goto error; | |
587 | } | |
588 | ||
45893984 DG |
589 | *sessionp = session; |
590 | ||
d0b96690 DG |
591 | return 0; |
592 | ||
593 | error: | |
9dbcf332 | 594 | ust_registry_session_destroy(session); |
d24ff3fd | 595 | free(session); |
9dbcf332 | 596 | error_alloc: |
d0b96690 DG |
597 | return -1; |
598 | } | |
599 | ||
600 | /* | |
601 | * Destroy session registry. This does NOT free the given pointer since it | |
602 | * might get passed as a reference. The registry lock should NOT be acquired. | |
603 | */ | |
604 | void ust_registry_session_destroy(struct ust_registry_session *reg) | |
605 | { | |
606 | int ret; | |
45893984 DG |
607 | struct lttng_ht_iter iter; |
608 | struct ust_registry_channel *chan; | |
d0b96690 | 609 | |
9d8efb0e DG |
610 | assert(reg); |
611 | ||
d0b96690 DG |
612 | /* On error, EBUSY can be returned if lock. Code flow error. */ |
613 | ret = pthread_mutex_destroy(®->lock); | |
614 | assert(!ret); | |
615 | ||
9d8efb0e DG |
616 | if (reg->channels) { |
617 | rcu_read_lock(); | |
618 | /* Destroy all event associated with this registry. */ | |
619 | cds_lfht_for_each_entry(reg->channels->ht, &iter.iter, chan, | |
620 | node.node) { | |
621 | /* Delete the node from the ht and free it. */ | |
622 | ret = lttng_ht_del(reg->channels, &iter); | |
623 | assert(!ret); | |
624 | destroy_channel(chan); | |
625 | } | |
626 | rcu_read_unlock(); | |
627 | ht_cleanup_push(reg->channels); | |
45893984 | 628 | } |
45893984 | 629 | |
d0b96690 DG |
630 | free(reg->metadata); |
631 | } |