Commit | Line | Data |
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5b74c7b1 | 1 | /* |
21cf9b6b | 2 | * Copyright (C) 2011 EfficiOS Inc. |
5b74c7b1 | 3 | * |
ab5be9fa | 4 | * SPDX-License-Identifier: GPL-2.0-only |
91d76f53 | 5 | * |
5b74c7b1 DG |
6 | */ |
7 | ||
6c1c0768 | 8 | #define _LGPL_SOURCE |
28ab034a JG |
9 | #include "cmd.hpp" |
10 | #include "kernel.hpp" | |
11 | #include "lttng-sessiond.hpp" | |
12 | #include "session.hpp" | |
13 | #include "timer.hpp" | |
14 | #include "trace-ust.hpp" | |
15 | #include "utils.hpp" | |
16 | ||
17 | #include <common/common.hpp> | |
18 | #include <common/sessiond-comm/sessiond-comm.hpp> | |
19 | #include <common/trace-chunk.hpp> | |
20 | #include <common/urcu.hpp> | |
21 | #include <common/utils.hpp> | |
22 | ||
23 | #include <lttng/location-internal.hpp> | |
24 | ||
e99e3664 | 25 | #include <dirent.h> |
d022620a | 26 | #include <inttypes.h> |
e99e3664 JG |
27 | #include <limits.h> |
28 | #include <pthread.h> | |
5b74c7b1 DG |
29 | #include <stdio.h> |
30 | #include <stdlib.h> | |
31 | #include <string.h> | |
a304c14c | 32 | #include <sys/stat.h> |
3d071855 | 33 | #include <sys/types.h> |
e99e3664 | 34 | #include <urcu.h> |
5b74c7b1 | 35 | |
f1494934 | 36 | namespace { |
3e3665b8 JG |
37 | struct ltt_session_destroy_notifier_element { |
38 | ltt_session_destroy_notifier notifier; | |
39 | void *user_data; | |
40 | }; | |
41 | ||
ccbdaca4 MD |
42 | struct ltt_session_clear_notifier_element { |
43 | ltt_session_clear_notifier notifier; | |
44 | void *user_data; | |
45 | }; | |
46 | ||
e99e3664 JG |
47 | namespace ls = lttng::sessiond; |
48 | ||
8c0faa1d | 49 | /* |
b5541356 | 50 | * NOTES: |
8c0faa1d | 51 | * |
b5541356 | 52 | * No ltt_session.lock is taken here because those data structure are widely |
e1bbf989 | 53 | * spread across the lttng-tools code base so before calling functions below |
b5541356 | 54 | * that can read/write a session, the caller MUST acquire the session lock |
54d01ffb | 55 | * using session_lock() and session_unlock(). |
8c0faa1d | 56 | */ |
8c0faa1d | 57 | |
f1494934 JG |
58 | /* These characters are forbidden in a session name. Used by validate_name. */ |
59 | const char *forbidden_name_chars = "/"; | |
60 | ||
61 | /* Global hash table to keep the sessions, indexed by id. */ | |
cd9adb8b | 62 | struct lttng_ht *ltt_sessions_ht_by_id = nullptr; |
f1494934 | 63 | /* Global hash table to keep the sessions, indexed by name. */ |
cd9adb8b | 64 | struct lttng_ht *ltt_sessions_ht_by_name = nullptr; |
f1494934 | 65 | |
5b74c7b1 | 66 | /* |
b5541356 | 67 | * Init tracing session list. |
5b74c7b1 | 68 | * |
b5541356 | 69 | * Please see session.h for more explanation and correct usage of the list. |
5b74c7b1 | 70 | */ |
1a496780 | 71 | struct ltt_session_list the_session_list; |
d9a970b7 JG |
72 | |
73 | /* | |
74 | * Return a ltt_session structure ptr that matches name. If no session found, | |
75 | * NULL is returned. This must be called with the session list lock held using | |
76 | * session_lock_list and session_unlock_list. | |
77 | * A reference to the session is implicitly acquired by this function. | |
78 | */ | |
79 | struct ltt_session *session_find_by_name(const char *name) | |
80 | { | |
81 | struct ltt_session *iter; | |
82 | ||
83 | LTTNG_ASSERT(name); | |
84 | ASSERT_SESSION_LIST_LOCKED(); | |
85 | ||
86 | DBG2("Trying to find session by name %s", name); | |
87 | ||
88 | cds_list_for_each_entry (iter, &the_session_list.head, list) { | |
89 | if (!strncmp(iter->name, name, NAME_MAX) && !iter->destroyed) { | |
90 | goto found; | |
91 | } | |
92 | } | |
93 | ||
94 | return nullptr; | |
95 | found: | |
96 | return session_get(iter) ? iter : nullptr; | |
97 | } | |
98 | ||
99 | /* | |
100 | * Return an ltt_session that matches the id. If no session is found, | |
101 | * NULL is returned. This must be called with rcu_read_lock and | |
102 | * session list lock held (to guarantee the lifetime of the session). | |
103 | */ | |
104 | struct ltt_session *session_find_by_id(uint64_t id) | |
105 | { | |
106 | struct lttng_ht_node_u64 *node; | |
107 | struct lttng_ht_iter iter; | |
108 | struct ltt_session *ls; | |
109 | ||
110 | ASSERT_RCU_READ_LOCKED(); | |
111 | ASSERT_SESSION_LIST_LOCKED(); | |
112 | ||
113 | if (!ltt_sessions_ht_by_id) { | |
114 | goto end; | |
115 | } | |
116 | ||
117 | lttng_ht_lookup(ltt_sessions_ht_by_id, &id, &iter); | |
118 | node = lttng_ht_iter_get_node_u64(&iter); | |
119 | if (node == nullptr) { | |
120 | goto end; | |
121 | } | |
122 | ls = lttng::utils::container_of(node, <t_session::node); | |
123 | ||
124 | DBG3("Session %" PRIu64 " found by id.", id); | |
125 | return session_get(ls) ? ls : nullptr; | |
126 | ||
127 | end: | |
128 | DBG3("Session %" PRIu64 " NOT found by id", id); | |
129 | return nullptr; | |
130 | } | |
f1494934 | 131 | } /* namespace */ |
23324029 | 132 | |
1c1c3634 DG |
133 | /* |
134 | * Validate the session name for forbidden characters. | |
135 | * | |
136 | * Return 0 on success else -1 meaning a forbidden char. has been found. | |
137 | */ | |
138 | static int validate_name(const char *name) | |
139 | { | |
140 | int ret; | |
141 | char *tok, *tmp_name; | |
142 | ||
a0377dfe | 143 | LTTNG_ASSERT(name); |
1c1c3634 DG |
144 | |
145 | tmp_name = strdup(name); | |
146 | if (!tmp_name) { | |
147 | /* ENOMEM here. */ | |
148 | ret = -1; | |
149 | goto error; | |
150 | } | |
151 | ||
152 | tok = strpbrk(tmp_name, forbidden_name_chars); | |
153 | if (tok) { | |
154 | DBG("Session name %s contains a forbidden character", name); | |
155 | /* Forbidden character has been found. */ | |
156 | ret = -1; | |
157 | goto error; | |
158 | } | |
159 | ret = 0; | |
160 | ||
161 | error: | |
162 | free(tmp_name); | |
163 | return ret; | |
164 | } | |
165 | ||
5b74c7b1 | 166 | /* |
050349bb | 167 | * Add a ltt_session structure to the global list. |
5b74c7b1 | 168 | * |
050349bb | 169 | * The caller MUST acquire the session list lock before. |
44e96653 | 170 | * Returns the unique identifier for the session. |
5b74c7b1 | 171 | */ |
d022620a | 172 | static uint64_t add_session_list(struct ltt_session *ls) |
5b74c7b1 | 173 | { |
a0377dfe | 174 | LTTNG_ASSERT(ls); |
0525e9ae | 175 | |
f1494934 JG |
176 | cds_list_add(&ls->list, &the_session_list.head); |
177 | return the_session_list.next_uuid++; | |
5b74c7b1 DG |
178 | } |
179 | ||
180 | /* | |
050349bb | 181 | * Delete a ltt_session structure to the global list. |
b5541356 | 182 | * |
050349bb | 183 | * The caller MUST acquire the session list lock before. |
5b74c7b1 DG |
184 | */ |
185 | static void del_session_list(struct ltt_session *ls) | |
186 | { | |
a0377dfe | 187 | LTTNG_ASSERT(ls); |
0525e9ae | 188 | |
5b74c7b1 | 189 | cds_list_del(&ls->list); |
5b74c7b1 DG |
190 | } |
191 | ||
b5541356 | 192 | /* |
050349bb | 193 | * Return a pointer to the session list. |
b5541356 | 194 | */ |
cd9adb8b | 195 | struct ltt_session_list *session_get_list() |
b5541356 | 196 | { |
f1494934 | 197 | return &the_session_list; |
b5541356 DG |
198 | } |
199 | ||
99d688f2 JG |
200 | /* |
201 | * Returns once the session list is empty. | |
202 | */ | |
d9a970b7 | 203 | void session_list_wait_empty(std::unique_lock<std::mutex> list_lock) |
99d688f2 | 204 | { |
1a496780 JG |
205 | /* Keep waiting until the session list is empty. */ |
206 | the_session_list.removal_cond.wait(list_lock, | |
207 | [] { return cds_list_empty(&the_session_list.head); }); | |
99d688f2 JG |
208 | } |
209 | ||
71e0a100 JG |
210 | /* |
211 | * Try to acquire session list lock | |
212 | */ | |
0038180d | 213 | int session_trylock_list() noexcept |
71e0a100 | 214 | { |
1a496780 JG |
215 | /* Return 0 if successfully acquired. */ |
216 | return the_session_list.lock.try_lock() ? 0 : 1; | |
71e0a100 JG |
217 | } |
218 | ||
dd73d57b JG |
219 | /* |
220 | * Get the session's consumer destination type. | |
221 | * | |
222 | * The caller must hold the session lock. | |
223 | */ | |
28ab034a | 224 | enum consumer_dst_type session_get_consumer_destination_type(const struct ltt_session *session) |
dd73d57b JG |
225 | { |
226 | /* | |
227 | * The output information is duplicated in both of those session types. | |
228 | * Hence, it doesn't matter from which it is retrieved. However, it is | |
229 | * possible for only one of them to be set. | |
230 | */ | |
28ab034a JG |
231 | return session->kernel_session ? session->kernel_session->consumer->type : |
232 | session->ust_session->consumer->type; | |
dd73d57b JG |
233 | } |
234 | ||
235 | /* | |
236 | * Get the session's consumer network hostname. | |
237 | * The caller must ensure that the destination is of type "net". | |
238 | * | |
239 | * The caller must hold the session lock. | |
240 | */ | |
241 | const char *session_get_net_consumer_hostname(const struct ltt_session *session) | |
242 | { | |
cd9adb8b | 243 | const char *hostname = nullptr; |
dd73d57b JG |
244 | const struct consumer_output *output; |
245 | ||
28ab034a JG |
246 | output = session->kernel_session ? session->kernel_session->consumer : |
247 | session->ust_session->consumer; | |
dd73d57b JG |
248 | |
249 | /* | |
250 | * hostname is assumed to be the same for both control and data | |
251 | * connections. | |
252 | */ | |
253 | switch (output->dst.net.control.dtype) { | |
254 | case LTTNG_DST_IPV4: | |
255 | hostname = output->dst.net.control.dst.ipv4; | |
256 | break; | |
257 | case LTTNG_DST_IPV6: | |
258 | hostname = output->dst.net.control.dst.ipv6; | |
259 | break; | |
260 | default: | |
261 | abort(); | |
262 | } | |
263 | return hostname; | |
264 | } | |
265 | ||
266 | /* | |
267 | * Get the session's consumer network control and data ports. | |
268 | * The caller must ensure that the destination is of type "net". | |
269 | * | |
270 | * The caller must hold the session lock. | |
271 | */ | |
272 | void session_get_net_consumer_ports(const struct ltt_session *session, | |
28ab034a JG |
273 | uint16_t *control_port, |
274 | uint16_t *data_port) | |
dd73d57b JG |
275 | { |
276 | const struct consumer_output *output; | |
277 | ||
28ab034a JG |
278 | output = session->kernel_session ? session->kernel_session->consumer : |
279 | session->ust_session->consumer; | |
dd73d57b JG |
280 | *control_port = output->dst.net.control.port; |
281 | *data_port = output->dst.net.data.port; | |
282 | } | |
283 | ||
5d65beab JG |
284 | /* |
285 | * Get the location of the latest trace archive produced by a rotation. | |
286 | * | |
287 | * The caller must hold the session lock. | |
288 | */ | |
28ab034a JG |
289 | struct lttng_trace_archive_location * |
290 | session_get_trace_archive_location(const struct ltt_session *session) | |
5d65beab | 291 | { |
d2956687 | 292 | int ret; |
cd9adb8b JG |
293 | struct lttng_trace_archive_location *location = nullptr; |
294 | char *chunk_path = nullptr; | |
d2956687 JG |
295 | |
296 | if (session->rotation_state != LTTNG_ROTATION_STATE_COMPLETED || | |
28ab034a | 297 | !session->last_archived_chunk_name) { |
d2956687 JG |
298 | goto end; |
299 | } | |
5d65beab | 300 | |
5d65beab JG |
301 | switch (session_get_consumer_destination_type(session)) { |
302 | case CONSUMER_DST_LOCAL: | |
ecd1a12f | 303 | ret = asprintf(&chunk_path, |
28ab034a JG |
304 | "%s/" DEFAULT_ARCHIVED_TRACE_CHUNKS_DIRECTORY "/%s", |
305 | session_get_base_path(session), | |
306 | session->last_archived_chunk_name); | |
ecd1a12f MD |
307 | if (ret == -1) { |
308 | goto end; | |
309 | } | |
28ab034a | 310 | location = lttng_trace_archive_location_local_create(chunk_path); |
5d65beab JG |
311 | break; |
312 | case CONSUMER_DST_NET: | |
313 | { | |
314 | const char *hostname; | |
315 | uint16_t control_port, data_port; | |
316 | ||
317 | hostname = session_get_net_consumer_hostname(session); | |
28ab034a | 318 | session_get_net_consumer_ports(session, &control_port, &data_port); |
5d65beab | 319 | location = lttng_trace_archive_location_relay_create( |
28ab034a JG |
320 | hostname, |
321 | LTTNG_TRACE_ARCHIVE_LOCATION_RELAY_PROTOCOL_TYPE_TCP, | |
322 | control_port, | |
323 | data_port, | |
324 | session->last_chunk_path); | |
5d65beab JG |
325 | break; |
326 | } | |
327 | default: | |
328 | abort(); | |
329 | } | |
330 | end: | |
d2956687 | 331 | free(chunk_path); |
5d65beab JG |
332 | return location; |
333 | } | |
334 | ||
23324029 | 335 | /* |
e1bbf989 | 336 | * Allocate the ltt_sessions_ht_by_id and ltt_sessions_ht_by_name HT. |
9c6518bc JG |
337 | * |
338 | * The session list lock must be held. | |
23324029 | 339 | */ |
cd9adb8b | 340 | static int ltt_sessions_ht_alloc() |
23324029 JD |
341 | { |
342 | int ret = 0; | |
343 | ||
344 | DBG("Allocating ltt_sessions_ht_by_id"); | |
345 | ltt_sessions_ht_by_id = lttng_ht_new(0, LTTNG_HT_TYPE_U64); | |
346 | if (!ltt_sessions_ht_by_id) { | |
347 | ret = -1; | |
348 | ERR("Failed to allocate ltt_sessions_ht_by_id"); | |
349 | goto end; | |
350 | } | |
e1bbf989 JR |
351 | |
352 | DBG("Allocating ltt_sessions_ht_by_name"); | |
353 | ltt_sessions_ht_by_name = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
354 | if (!ltt_sessions_ht_by_name) { | |
355 | ret = -1; | |
356 | ERR("Failed to allocate ltt_sessions_ht_by_name"); | |
357 | goto end; | |
358 | } | |
359 | ||
23324029 JD |
360 | end: |
361 | return ret; | |
362 | } | |
363 | ||
364 | /* | |
365 | * Destroy the ltt_sessions_ht_by_id HT. | |
9c6518bc JG |
366 | * |
367 | * The session list lock must be held. | |
23324029 | 368 | */ |
cd9adb8b | 369 | static void ltt_sessions_ht_destroy() |
23324029 | 370 | { |
e1bbf989 | 371 | if (ltt_sessions_ht_by_id) { |
3c339053 | 372 | lttng_ht_destroy(ltt_sessions_ht_by_id); |
cd9adb8b | 373 | ltt_sessions_ht_by_id = nullptr; |
e1bbf989 JR |
374 | } |
375 | ||
376 | if (ltt_sessions_ht_by_name) { | |
3c339053 | 377 | lttng_ht_destroy(ltt_sessions_ht_by_name); |
cd9adb8b | 378 | ltt_sessions_ht_by_name = nullptr; |
23324029 | 379 | } |
e1bbf989 JR |
380 | |
381 | return; | |
23324029 JD |
382 | } |
383 | ||
384 | /* | |
e1bbf989 JR |
385 | * Add a ltt_session to the ltt_sessions_ht_by_id and ltt_sessions_ht_by_name. |
386 | * If unallocated, the ltt_sessions_ht_by_id and ltt_sessions_ht_by_name. HTs | |
387 | * are allocated. The session list lock must be held. | |
23324029 JD |
388 | */ |
389 | static void add_session_ht(struct ltt_session *ls) | |
390 | { | |
391 | int ret; | |
392 | ||
a0377dfe | 393 | LTTNG_ASSERT(ls); |
23324029 JD |
394 | |
395 | if (!ltt_sessions_ht_by_id) { | |
396 | ret = ltt_sessions_ht_alloc(); | |
397 | if (ret) { | |
398 | ERR("Error allocating the sessions HT"); | |
399 | goto end; | |
400 | } | |
401 | } | |
e1bbf989 JR |
402 | |
403 | /* Should always be present with ltt_sessions_ht_by_id. */ | |
a0377dfe | 404 | LTTNG_ASSERT(ltt_sessions_ht_by_name); |
e1bbf989 | 405 | |
23324029 JD |
406 | lttng_ht_node_init_u64(&ls->node, ls->id); |
407 | lttng_ht_add_unique_u64(ltt_sessions_ht_by_id, &ls->node); | |
408 | ||
e1bbf989 JR |
409 | lttng_ht_node_init_str(&ls->node_by_name, ls->name); |
410 | lttng_ht_add_unique_str(ltt_sessions_ht_by_name, &ls->node_by_name); | |
411 | ||
23324029 JD |
412 | end: |
413 | return; | |
414 | } | |
415 | ||
416 | /* | |
e1bbf989 | 417 | * Test if ltt_sessions_ht_by_id/name are empty. |
2a6ebf6b | 418 | * Return `false` if hash table objects are null. |
23324029 JD |
419 | * The session list lock must be held. |
420 | */ | |
cd9adb8b | 421 | static bool ltt_sessions_ht_empty() |
23324029 | 422 | { |
2a6ebf6b | 423 | bool empty = false; |
23324029 JD |
424 | |
425 | if (!ltt_sessions_ht_by_id) { | |
2a6ebf6b | 426 | /* The hash tables do not exist yet. */ |
23324029 JD |
427 | goto end; |
428 | } | |
429 | ||
a0377dfe | 430 | LTTNG_ASSERT(ltt_sessions_ht_by_name); |
e1bbf989 | 431 | |
6f729565 | 432 | if (lttng_ht_get_count(ltt_sessions_ht_by_id) != 0) { |
2a6ebf6b JR |
433 | /* Not empty.*/ |
434 | goto end; | |
435 | } | |
436 | ||
437 | /* | |
438 | * At this point it is expected that the `ltt_sessions_ht_by_name` ht is | |
439 | * empty. | |
440 | * | |
441 | * The removal from both hash tables is done in two different | |
442 | * places: | |
443 | * - removal from `ltt_sessions_ht_by_name` is done during | |
444 | * `session_destroy()` | |
445 | * - removal from `ltt_sessions_ht_by_id` is done later | |
446 | * in `session_release()` on the last reference put. | |
447 | * | |
448 | * This means that it is possible for `ltt_sessions_ht_by_name` to be | |
449 | * empty but for `ltt_sessions_ht_by_id` to still contain objects when | |
450 | * multiple sessions exists. The reverse is false, hence this sanity | |
451 | * check. | |
452 | */ | |
453 | LTTNG_ASSERT(lttng_ht_get_count(ltt_sessions_ht_by_name) == 0); | |
454 | empty = true; | |
23324029 | 455 | end: |
2a6ebf6b | 456 | return empty; |
23324029 JD |
457 | } |
458 | ||
459 | /* | |
ed41e570 | 460 | * Remove a ltt_session from the ltt_sessions_ht_by_id. |
e1bbf989 | 461 | * If empty, the ltt_sessions_ht_by_id/name HTs are freed. |
23324029 JD |
462 | * The session list lock must be held. |
463 | */ | |
464 | static void del_session_ht(struct ltt_session *ls) | |
465 | { | |
466 | struct lttng_ht_iter iter; | |
467 | int ret; | |
468 | ||
a0377dfe FD |
469 | LTTNG_ASSERT(ls); |
470 | LTTNG_ASSERT(ltt_sessions_ht_by_id); | |
471 | LTTNG_ASSERT(ltt_sessions_ht_by_name); | |
23324029 JD |
472 | |
473 | iter.iter.node = &ls->node.node; | |
474 | ret = lttng_ht_del(ltt_sessions_ht_by_id, &iter); | |
a0377dfe | 475 | LTTNG_ASSERT(!ret); |
23324029 JD |
476 | |
477 | if (ltt_sessions_ht_empty()) { | |
e1bbf989 | 478 | DBG("Empty ltt_sessions_ht_by_id/name, destroying hast tables"); |
23324029 JD |
479 | ltt_sessions_ht_destroy(); |
480 | } | |
481 | } | |
482 | ||
b5541356 | 483 | /* |
6c9cc2ab | 484 | * Acquire session lock |
b5541356 | 485 | */ |
54d01ffb | 486 | void session_lock(struct ltt_session *session) |
b5541356 | 487 | { |
a0377dfe | 488 | LTTNG_ASSERT(session); |
d9a970b7 JG |
489 | session->lock(); |
490 | } | |
0525e9ae | 491 | |
d9a970b7 JG |
492 | void ltt_session::lock() const noexcept |
493 | { | |
494 | pthread_mutex_lock(&_lock); | |
495 | } | |
496 | ||
497 | void ltt_session::unlock() const noexcept | |
498 | { | |
499 | ltt_session::_const_session_unlock(*this); | |
6c9cc2ab | 500 | } |
b5541356 | 501 | |
6c9cc2ab DG |
502 | /* |
503 | * Release session lock | |
504 | */ | |
54d01ffb | 505 | void session_unlock(struct ltt_session *session) |
6c9cc2ab | 506 | { |
a0377dfe | 507 | LTTNG_ASSERT(session); |
d9a970b7 JG |
508 | session->unlock(); |
509 | } | |
0525e9ae | 510 | |
d9a970b7 JG |
511 | void ltt_session::_const_session_unlock(const ltt_session &session) |
512 | { | |
513 | pthread_mutex_unlock(&session._lock); | |
b5541356 DG |
514 | } |
515 | ||
28ab034a JG |
516 | static int _session_set_trace_chunk_no_lock_check(struct ltt_session *session, |
517 | struct lttng_trace_chunk *new_trace_chunk, | |
518 | struct lttng_trace_chunk **_current_trace_chunk) | |
82b69413 | 519 | { |
78fc586b | 520 | int ret = 0; |
82b69413 | 521 | unsigned int i, refs_to_acquire = 0, refs_acquired = 0, refs_to_release = 0; |
82b69413 JG |
522 | struct cds_lfht_iter iter; |
523 | struct consumer_socket *socket; | |
d2956687 JG |
524 | struct lttng_trace_chunk *current_trace_chunk; |
525 | uint64_t chunk_id; | |
526 | enum lttng_trace_chunk_status chunk_status; | |
82b69413 | 527 | |
56047f5a | 528 | lttng::urcu::read_lock_guard read_lock; |
82b69413 | 529 | /* |
d2956687 JG |
530 | * Ownership of current trace chunk is transferred to |
531 | * `current_trace_chunk`. | |
82b69413 | 532 | */ |
d2956687 | 533 | current_trace_chunk = session->current_trace_chunk; |
cd9adb8b | 534 | session->current_trace_chunk = nullptr; |
82b69413 | 535 | if (session->ust_session) { |
28ab034a | 536 | lttng_trace_chunk_put(session->ust_session->current_trace_chunk); |
cd9adb8b | 537 | session->ust_session->current_trace_chunk = nullptr; |
82b69413 JG |
538 | } |
539 | if (session->kernel_session) { | |
28ab034a | 540 | lttng_trace_chunk_put(session->kernel_session->current_trace_chunk); |
cd9adb8b | 541 | session->kernel_session->current_trace_chunk = nullptr; |
82b69413 | 542 | } |
d2956687 JG |
543 | if (!new_trace_chunk) { |
544 | ret = 0; | |
545 | goto end; | |
82b69413 | 546 | } |
d2956687 | 547 | chunk_status = lttng_trace_chunk_get_id(new_trace_chunk, &chunk_id); |
a0377dfe | 548 | LTTNG_ASSERT(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK); |
82b69413 | 549 | |
d2956687 JG |
550 | refs_to_acquire = 1; |
551 | refs_to_acquire += !!session->ust_session; | |
552 | refs_to_acquire += !!session->kernel_session; | |
553 | ||
28ab034a | 554 | for (refs_acquired = 0; refs_acquired < refs_to_acquire; refs_acquired++) { |
d2956687 JG |
555 | if (!lttng_trace_chunk_get(new_trace_chunk)) { |
556 | ERR("Failed to acquire reference to new trace chunk of session \"%s\"", | |
28ab034a | 557 | session->name); |
d2956687 | 558 | goto error; |
82b69413 JG |
559 | } |
560 | } | |
561 | ||
d2956687 | 562 | if (session->ust_session) { |
28ab034a JG |
563 | const uint64_t relayd_id = session->ust_session->consumer->net_seq_index; |
564 | const bool is_local_trace = session->ust_session->consumer->type == | |
565 | CONSUMER_DST_LOCAL; | |
e5add6d0 | 566 | |
d2956687 | 567 | session->ust_session->current_trace_chunk = new_trace_chunk; |
f8a37411 | 568 | if (is_local_trace) { |
d2956687 | 569 | enum lttng_error_code ret_error_code; |
82b69413 | 570 | |
28ab034a JG |
571 | ret_error_code = |
572 | ust_app_create_channel_subdirectories(session->ust_session); | |
d2956687 | 573 | if (ret_error_code != LTTNG_OK) { |
82b69413 JG |
574 | goto error; |
575 | } | |
f8a37411 | 576 | } |
28ab034a JG |
577 | cds_lfht_for_each_entry ( |
578 | session->ust_session->consumer->socks->ht, &iter, socket, node.node) { | |
d2956687 JG |
579 | pthread_mutex_lock(socket->lock); |
580 | ret = consumer_create_trace_chunk(socket, | |
28ab034a JG |
581 | relayd_id, |
582 | session->id, | |
583 | new_trace_chunk, | |
584 | DEFAULT_UST_TRACE_DIR); | |
d2956687 | 585 | pthread_mutex_unlock(socket->lock); |
f8a37411 | 586 | if (ret) { |
d2956687 | 587 | goto error; |
f8a37411 JG |
588 | } |
589 | } | |
590 | } | |
82b69413 | 591 | if (session->kernel_session) { |
28ab034a JG |
592 | const uint64_t relayd_id = session->kernel_session->consumer->net_seq_index; |
593 | const bool is_local_trace = session->kernel_session->consumer->type == | |
594 | CONSUMER_DST_LOCAL; | |
e5add6d0 | 595 | |
d2956687 JG |
596 | session->kernel_session->current_trace_chunk = new_trace_chunk; |
597 | if (is_local_trace) { | |
598 | enum lttng_error_code ret_error_code; | |
599 | ||
28ab034a JG |
600 | ret_error_code = |
601 | kernel_create_channel_subdirectories(session->kernel_session); | |
d2956687 | 602 | if (ret_error_code != LTTNG_OK) { |
d2956687 JG |
603 | goto error; |
604 | } | |
f8a37411 | 605 | } |
28ab034a JG |
606 | cds_lfht_for_each_entry ( |
607 | session->kernel_session->consumer->socks->ht, &iter, socket, node.node) { | |
d2956687 JG |
608 | pthread_mutex_lock(socket->lock); |
609 | ret = consumer_create_trace_chunk(socket, | |
28ab034a JG |
610 | relayd_id, |
611 | session->id, | |
612 | new_trace_chunk, | |
613 | DEFAULT_KERNEL_TRACE_DIR); | |
d2956687 | 614 | pthread_mutex_unlock(socket->lock); |
f8a37411 | 615 | if (ret) { |
d2956687 | 616 | goto error; |
f8a37411 JG |
617 | } |
618 | } | |
619 | } | |
82b69413 JG |
620 | |
621 | /* | |
622 | * Update local current trace chunk state last, only if all remote | |
d2956687 | 623 | * creations succeeded. |
82b69413 JG |
624 | */ |
625 | session->current_trace_chunk = new_trace_chunk; | |
d2956687 JG |
626 | LTTNG_OPTIONAL_SET(&session->most_recent_chunk_id, chunk_id); |
627 | end: | |
628 | if (_current_trace_chunk) { | |
629 | *_current_trace_chunk = current_trace_chunk; | |
cd9adb8b | 630 | current_trace_chunk = nullptr; |
d2956687 JG |
631 | } |
632 | end_no_move: | |
d2956687 JG |
633 | lttng_trace_chunk_put(current_trace_chunk); |
634 | return ret; | |
635 | error: | |
82b69413 | 636 | if (session->ust_session) { |
cd9adb8b | 637 | session->ust_session->current_trace_chunk = nullptr; |
82b69413 JG |
638 | } |
639 | if (session->kernel_session) { | |
cd9adb8b | 640 | session->kernel_session->current_trace_chunk = nullptr; |
82b69413 | 641 | } |
f8a37411 | 642 | /* |
82b69413 JG |
643 | * Release references taken in the case where all references could not |
644 | * be acquired. | |
645 | */ | |
646 | refs_to_release = refs_to_acquire - refs_acquired; | |
647 | for (i = 0; i < refs_to_release; i++) { | |
648 | lttng_trace_chunk_put(new_trace_chunk); | |
649 | } | |
d2956687 JG |
650 | ret = -1; |
651 | goto end_no_move; | |
82b69413 JG |
652 | } |
653 | ||
28ab034a JG |
654 | struct lttng_trace_chunk * |
655 | session_create_new_trace_chunk(const struct ltt_session *session, | |
656 | const struct consumer_output *consumer_output_override, | |
657 | const char *session_base_path_override, | |
658 | const char *chunk_name_override) | |
82b69413 JG |
659 | { |
660 | int ret; | |
cd9adb8b | 661 | struct lttng_trace_chunk *trace_chunk = nullptr; |
82b69413 | 662 | enum lttng_trace_chunk_status chunk_status; |
cd9adb8b | 663 | const time_t chunk_creation_ts = time(nullptr); |
348a81dc JG |
664 | bool is_local_trace; |
665 | const char *base_path; | |
cd9adb8b | 666 | struct lttng_directory_handle *session_output_directory = nullptr; |
82b69413 | 667 | const struct lttng_credentials session_credentials = { |
ff588497 JR |
668 | .uid = LTTNG_OPTIONAL_INIT_VALUE(session->uid), |
669 | .gid = LTTNG_OPTIONAL_INIT_VALUE(session->gid), | |
82b69413 JG |
670 | }; |
671 | uint64_t next_chunk_id; | |
348a81dc | 672 | const struct consumer_output *output; |
a7ceb342 | 673 | const char *new_path; |
348a81dc JG |
674 | |
675 | if (consumer_output_override) { | |
676 | output = consumer_output_override; | |
677 | } else { | |
a0377dfe | 678 | LTTNG_ASSERT(session->ust_session || session->kernel_session); |
28ab034a JG |
679 | output = session->ust_session ? session->ust_session->consumer : |
680 | session->kernel_session->consumer; | |
348a81dc JG |
681 | } |
682 | ||
683 | is_local_trace = output->type == CONSUMER_DST_LOCAL; | |
28ab034a | 684 | base_path = session_base_path_override ?: consumer_output_get_base_path(output); |
82b69413 | 685 | |
d2956687 JG |
686 | if (chunk_creation_ts == (time_t) -1) { |
687 | PERROR("Failed to sample time while creation session \"%s\" trace chunk", | |
28ab034a | 688 | session->name); |
82b69413 JG |
689 | goto error; |
690 | } | |
82b69413 | 691 | |
28ab034a JG |
692 | next_chunk_id = |
693 | session->most_recent_chunk_id.is_set ? session->most_recent_chunk_id.value + 1 : 0; | |
82b69413 | 694 | |
a7ceb342 | 695 | if (session->current_trace_chunk && |
28ab034a | 696 | !lttng_trace_chunk_get_name_overridden(session->current_trace_chunk)) { |
a7ceb342 | 697 | chunk_status = lttng_trace_chunk_rename_path(session->current_trace_chunk, |
28ab034a | 698 | DEFAULT_CHUNK_TMP_OLD_DIRECTORY); |
a7ceb342 MD |
699 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { |
700 | goto error; | |
701 | } | |
702 | } | |
703 | if (!session->current_trace_chunk) { | |
704 | if (!session->rotated) { | |
705 | new_path = ""; | |
706 | } else { | |
cd9adb8b | 707 | new_path = nullptr; |
a7ceb342 MD |
708 | } |
709 | } else { | |
710 | new_path = DEFAULT_CHUNK_TMP_NEW_DIRECTORY; | |
711 | } | |
712 | ||
28ab034a | 713 | trace_chunk = lttng_trace_chunk_create(next_chunk_id, chunk_creation_ts, new_path); |
82b69413 | 714 | if (!trace_chunk) { |
82b69413 JG |
715 | goto error; |
716 | } | |
717 | ||
718 | if (chunk_name_override) { | |
28ab034a | 719 | chunk_status = lttng_trace_chunk_override_name(trace_chunk, chunk_name_override); |
d2956687 | 720 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { |
82b69413 JG |
721 | goto error; |
722 | } | |
723 | } | |
724 | ||
725 | if (!is_local_trace) { | |
726 | /* | |
727 | * No need to set crendentials and output directory | |
728 | * for remote trace chunks. | |
729 | */ | |
d2956687 | 730 | goto end; |
82b69413 JG |
731 | } |
732 | ||
28ab034a | 733 | chunk_status = lttng_trace_chunk_set_credentials(trace_chunk, &session_credentials); |
82b69413 | 734 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { |
82b69413 JG |
735 | goto error; |
736 | } | |
737 | ||
28ab034a JG |
738 | DBG("Creating base output directory of session \"%s\" at %s", session->name, base_path); |
739 | ret = utils_mkdir_recursive(base_path, S_IRWXU | S_IRWXG, session->uid, session->gid); | |
82b69413 | 740 | if (ret) { |
82b69413 JG |
741 | goto error; |
742 | } | |
cbf53d23 JG |
743 | session_output_directory = lttng_directory_handle_create(base_path); |
744 | if (!session_output_directory) { | |
82b69413 JG |
745 | goto error; |
746 | } | |
28ab034a | 747 | chunk_status = lttng_trace_chunk_set_as_owner(trace_chunk, session_output_directory); |
cbf53d23 | 748 | lttng_directory_handle_put(session_output_directory); |
cd9adb8b | 749 | session_output_directory = nullptr; |
82b69413 | 750 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { |
82b69413 JG |
751 | goto error; |
752 | } | |
d2956687 JG |
753 | end: |
754 | return trace_chunk; | |
82b69413 | 755 | error: |
cbf53d23 | 756 | lttng_directory_handle_put(session_output_directory); |
82b69413 | 757 | lttng_trace_chunk_put(trace_chunk); |
cd9adb8b | 758 | trace_chunk = nullptr; |
d2956687 JG |
759 | goto end; |
760 | } | |
761 | ||
343defc2 | 762 | int session_close_trace_chunk(struct ltt_session *session, |
28ab034a JG |
763 | struct lttng_trace_chunk *trace_chunk, |
764 | enum lttng_trace_chunk_command_type close_command, | |
765 | char *closed_trace_chunk_path) | |
d2956687 JG |
766 | { |
767 | int ret = 0; | |
768 | bool error_occurred = false; | |
769 | struct cds_lfht_iter iter; | |
770 | struct consumer_socket *socket; | |
771 | enum lttng_trace_chunk_status chunk_status; | |
cd9adb8b | 772 | const time_t chunk_close_timestamp = time(nullptr); |
a7ceb342 | 773 | const char *new_path; |
d2956687 | 774 | |
28ab034a | 775 | chunk_status = lttng_trace_chunk_set_close_command(trace_chunk, close_command); |
343defc2 MD |
776 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { |
777 | ret = -1; | |
778 | goto end; | |
bbc4768c JG |
779 | } |
780 | ||
d2956687 JG |
781 | if (chunk_close_timestamp == (time_t) -1) { |
782 | ERR("Failed to sample the close timestamp of the current trace chunk of session \"%s\"", | |
28ab034a | 783 | session->name); |
d2956687 JG |
784 | ret = -1; |
785 | goto end; | |
786 | } | |
a7ceb342 MD |
787 | |
788 | if (close_command == LTTNG_TRACE_CHUNK_COMMAND_TYPE_DELETE && !session->rotated) { | |
789 | /* New chunk stays in session output directory. */ | |
790 | new_path = ""; | |
791 | } else { | |
792 | /* Use chunk name for new chunk. */ | |
cd9adb8b | 793 | new_path = nullptr; |
a7ceb342 MD |
794 | } |
795 | if (session->current_trace_chunk && | |
28ab034a | 796 | !lttng_trace_chunk_get_name_overridden(session->current_trace_chunk)) { |
a7ceb342 | 797 | /* Rename new chunk path. */ |
28ab034a JG |
798 | chunk_status = |
799 | lttng_trace_chunk_rename_path(session->current_trace_chunk, new_path); | |
a7ceb342 MD |
800 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { |
801 | ret = -1; | |
802 | goto end; | |
803 | } | |
804 | } | |
805 | if (!lttng_trace_chunk_get_name_overridden(trace_chunk) && | |
28ab034a | 806 | close_command == LTTNG_TRACE_CHUNK_COMMAND_TYPE_NO_OPERATION) { |
a7ceb342 MD |
807 | const char *old_path; |
808 | ||
809 | if (!session->rotated) { | |
810 | old_path = ""; | |
811 | } else { | |
cd9adb8b | 812 | old_path = nullptr; |
a7ceb342 MD |
813 | } |
814 | /* We need to move back the .tmp_old_chunk to its rightful place. */ | |
28ab034a | 815 | chunk_status = lttng_trace_chunk_rename_path(trace_chunk, old_path); |
a7ceb342 MD |
816 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { |
817 | ret = -1; | |
818 | goto end; | |
819 | } | |
820 | } | |
821 | if (close_command == LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED) { | |
822 | session->rotated = true; | |
823 | } | |
28ab034a | 824 | chunk_status = lttng_trace_chunk_set_close_timestamp(trace_chunk, chunk_close_timestamp); |
d2956687 JG |
825 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { |
826 | ERR("Failed to set the close timestamp of the current trace chunk of session \"%s\"", | |
28ab034a | 827 | session->name); |
d2956687 JG |
828 | ret = -1; |
829 | goto end; | |
830 | } | |
831 | ||
832 | if (session->ust_session) { | |
28ab034a | 833 | const uint64_t relayd_id = session->ust_session->consumer->net_seq_index; |
0a184d4e | 834 | |
28ab034a JG |
835 | cds_lfht_for_each_entry ( |
836 | session->ust_session->consumer->socks->ht, &iter, socket, node.node) { | |
d2956687 JG |
837 | pthread_mutex_lock(socket->lock); |
838 | ret = consumer_close_trace_chunk(socket, | |
28ab034a JG |
839 | relayd_id, |
840 | session->id, | |
841 | trace_chunk, | |
842 | closed_trace_chunk_path); | |
d2956687 JG |
843 | pthread_mutex_unlock(socket->lock); |
844 | if (ret) { | |
845 | ERR("Failed to close trace chunk on user space consumer"); | |
846 | error_occurred = true; | |
847 | } | |
848 | } | |
849 | } | |
850 | if (session->kernel_session) { | |
28ab034a | 851 | const uint64_t relayd_id = session->kernel_session->consumer->net_seq_index; |
0a184d4e | 852 | |
28ab034a JG |
853 | cds_lfht_for_each_entry ( |
854 | session->kernel_session->consumer->socks->ht, &iter, socket, node.node) { | |
d2956687 JG |
855 | pthread_mutex_lock(socket->lock); |
856 | ret = consumer_close_trace_chunk(socket, | |
28ab034a JG |
857 | relayd_id, |
858 | session->id, | |
859 | trace_chunk, | |
860 | closed_trace_chunk_path); | |
d2956687 JG |
861 | pthread_mutex_unlock(socket->lock); |
862 | if (ret) { | |
863 | ERR("Failed to close trace chunk on kernel consumer"); | |
864 | error_occurred = true; | |
865 | } | |
866 | } | |
867 | } | |
868 | ret = error_occurred ? -1 : 0; | |
82b69413 | 869 | end: |
d2956687 | 870 | return ret; |
82b69413 JG |
871 | } |
872 | ||
04ed9e10 JG |
873 | /* |
874 | * This function skips the metadata channel as the begin/end timestamps of a | |
875 | * metadata packet are useless. | |
876 | * | |
877 | * Moreover, opening a packet after a "clear" will cause problems for live | |
878 | * sessions as it will introduce padding that was not part of the first trace | |
879 | * chunk. The relay daemon expects the content of the metadata stream of | |
880 | * successive metadata trace chunks to be strict supersets of one another. | |
881 | * | |
882 | * For example, flushing a packet at the beginning of the metadata stream of | |
883 | * a trace chunk resulting from a "clear" session command will cause the | |
884 | * size of the metadata stream of the new trace chunk to not match the size of | |
885 | * the metadata stream of the original chunk. This will confuse the relay | |
886 | * daemon as the same "offset" in a metadata stream will no longer point | |
887 | * to the same content. | |
888 | */ | |
28ab034a | 889 | static enum lttng_error_code session_kernel_open_packets(struct ltt_session *session) |
04ed9e10 JG |
890 | { |
891 | enum lttng_error_code ret = LTTNG_OK; | |
892 | struct consumer_socket *socket; | |
893 | struct lttng_ht_iter iter; | |
894 | struct cds_lfht_node *node; | |
895 | struct ltt_kernel_channel *chan; | |
896 | ||
56047f5a | 897 | lttng::urcu::read_lock_guard read_lock; |
04ed9e10 JG |
898 | |
899 | cds_lfht_first(session->kernel_session->consumer->socks->ht, &iter.iter); | |
900 | node = cds_lfht_iter_get_node(&iter.iter); | |
0114db0e | 901 | socket = caa_container_of(node, typeof(*socket), node.node); |
04ed9e10 | 902 | |
28ab034a | 903 | cds_list_for_each_entry (chan, &session->kernel_session->channel_list.head, list) { |
04ed9e10 JG |
904 | int open_ret; |
905 | ||
906 | DBG("Open packet of kernel channel: channel key = %" PRIu64 | |
28ab034a JG |
907 | ", session name = %s, session_id = %" PRIu64, |
908 | chan->key, | |
909 | session->name, | |
910 | session->id); | |
04ed9e10 JG |
911 | |
912 | open_ret = consumer_open_channel_packets(socket, chan->key); | |
913 | if (open_ret < 0) { | |
914 | /* General error (no known error expected). */ | |
915 | ret = LTTNG_ERR_UNK; | |
916 | goto end; | |
917 | } | |
918 | } | |
919 | ||
920 | end: | |
04ed9e10 JG |
921 | return ret; |
922 | } | |
923 | ||
924 | enum lttng_error_code session_open_packets(struct ltt_session *session) | |
925 | { | |
926 | enum lttng_error_code ret = LTTNG_OK; | |
927 | ||
928 | DBG("Opening packets of session channels: session name = %s, session id = %" PRIu64, | |
28ab034a JG |
929 | session->name, |
930 | session->id); | |
04ed9e10 JG |
931 | |
932 | if (session->ust_session) { | |
933 | ret = ust_app_open_packets(session); | |
934 | if (ret != LTTNG_OK) { | |
935 | goto end; | |
936 | } | |
937 | } | |
938 | ||
939 | if (session->kernel_session) { | |
940 | ret = session_kernel_open_packets(session); | |
941 | if (ret != LTTNG_OK) { | |
942 | goto end; | |
943 | } | |
944 | } | |
945 | ||
946 | end: | |
947 | return ret; | |
948 | } | |
949 | ||
82b69413 JG |
950 | /* |
951 | * Set a session's current trace chunk. | |
952 | * | |
953 | * Must be called with the session lock held. | |
954 | */ | |
955 | int session_set_trace_chunk(struct ltt_session *session, | |
28ab034a JG |
956 | struct lttng_trace_chunk *new_trace_chunk, |
957 | struct lttng_trace_chunk **current_trace_chunk) | |
82b69413 | 958 | { |
d9a970b7 | 959 | ASSERT_LOCKED(session->_lock); |
28ab034a JG |
960 | return _session_set_trace_chunk_no_lock_check( |
961 | session, new_trace_chunk, current_trace_chunk); | |
82b69413 JG |
962 | } |
963 | ||
28ab034a | 964 | static void session_notify_destruction(const struct ltt_session *session) |
3e3665b8 JG |
965 | { |
966 | size_t i; | |
28ab034a | 967 | const size_t count = lttng_dynamic_array_get_count(&session->destroy_notifiers); |
3e3665b8 JG |
968 | |
969 | for (i = 0; i < count; i++) { | |
970 | const struct ltt_session_destroy_notifier_element *element = | |
7966af57 | 971 | (ltt_session_destroy_notifier_element *) lttng_dynamic_array_get_element( |
28ab034a | 972 | &session->destroy_notifiers, i); |
3e3665b8 JG |
973 | |
974 | element->notifier(session, element->user_data); | |
975 | } | |
976 | } | |
977 | ||
ccbdaca4 MD |
978 | /* |
979 | * Fire each clear notifier once, and remove them from the array. | |
980 | */ | |
28f23191 | 981 | void session_notify_clear(ltt_session& session) |
ccbdaca4 MD |
982 | { |
983 | size_t i; | |
0038180d | 984 | const size_t count = lttng_dynamic_array_get_count(&session.clear_notifiers); |
ccbdaca4 MD |
985 | |
986 | for (i = 0; i < count; i++) { | |
987 | const struct ltt_session_clear_notifier_element *element = | |
7966af57 | 988 | (ltt_session_clear_notifier_element *) lttng_dynamic_array_get_element( |
0038180d | 989 | &session.clear_notifiers, i); |
ccbdaca4 | 990 | |
0038180d | 991 | element->notifier(&session, element->user_data); |
ccbdaca4 | 992 | } |
0038180d | 993 | lttng_dynamic_array_clear(&session.clear_notifiers); |
ccbdaca4 MD |
994 | } |
995 | ||
28ab034a | 996 | static void session_release(struct urcu_ref *ref) |
e32d7f27 JG |
997 | { |
998 | int ret; | |
999 | struct ltt_ust_session *usess; | |
1000 | struct ltt_kernel_session *ksess; | |
d9a970b7 | 1001 | struct ltt_session *session = lttng::utils::container_of(ref, <t_session::ref_count); |
7fdbed1c | 1002 | const bool session_published = session->published; |
e32d7f27 | 1003 | |
a0377dfe | 1004 | LTTNG_ASSERT(!session->chunk_being_archived); |
d2956687 | 1005 | |
e32d7f27 JG |
1006 | usess = session->ust_session; |
1007 | ksess = session->kernel_session; | |
3e3665b8 | 1008 | |
f8a37411 | 1009 | /* Clean kernel session teardown, keeping data for destroy notifier. */ |
e32d7f27 JG |
1010 | kernel_destroy_session(ksess); |
1011 | ||
d070c424 | 1012 | /* UST session teardown, keeping data for destroy notifier. */ |
e32d7f27 JG |
1013 | if (usess) { |
1014 | /* Close any relayd session */ | |
1015 | consumer_output_send_destroy_relayd(usess->consumer); | |
1016 | ||
1017 | /* Destroy every UST application related to this session. */ | |
1018 | ret = ust_app_destroy_trace_all(usess); | |
1019 | if (ret) { | |
1020 | ERR("Error in ust_app_destroy_trace_all"); | |
1021 | } | |
1022 | ||
d070c424 | 1023 | /* Clean up the rest, keeping destroy notifier data. */ |
e32d7f27 JG |
1024 | trace_ust_destroy_session(usess); |
1025 | } | |
1026 | ||
1027 | /* | |
1028 | * Must notify the kernel thread here to update it's poll set in order to | |
1029 | * remove the channel(s)' fd just destroyed. | |
1030 | */ | |
412d7227 | 1031 | ret = notify_thread_pipe(the_kernel_poll_pipe[1]); |
e32d7f27 JG |
1032 | if (ret < 0) { |
1033 | PERROR("write kernel poll pipe"); | |
1034 | } | |
1035 | ||
1036 | DBG("Destroying session %s (id %" PRIu64 ")", session->name, session->id); | |
e32d7f27 | 1037 | |
e32d7f27 | 1038 | snapshot_destroy(&session->snapshot); |
99d688f2 | 1039 | |
d9a970b7 | 1040 | pthread_mutex_destroy(&session->_lock); |
82b69413 | 1041 | |
7fdbed1c | 1042 | if (session_published) { |
1a496780 | 1043 | ASSERT_SESSION_LIST_LOCKED(); |
f4cc5e83 JG |
1044 | del_session_list(session); |
1045 | del_session_ht(session); | |
f4cc5e83 | 1046 | } |
7fdbed1c | 1047 | session_notify_destruction(session); |
d070c424 | 1048 | |
1ac9cb73 | 1049 | consumer_output_put(session->consumer); |
d070c424 | 1050 | kernel_free_session(ksess); |
cd9adb8b | 1051 | session->kernel_session = nullptr; |
d070c424 MD |
1052 | if (usess) { |
1053 | trace_ust_free_session(usess); | |
cd9adb8b | 1054 | session->ust_session = nullptr; |
d070c424 | 1055 | } |
7fdbed1c | 1056 | lttng_dynamic_array_reset(&session->destroy_notifiers); |
ccbdaca4 | 1057 | lttng_dynamic_array_reset(&session->clear_notifiers); |
d2956687 | 1058 | free(session->last_archived_chunk_name); |
6fa5fe7c | 1059 | free(session->base_path); |
c08136a3 | 1060 | lttng_trigger_put(session->rotate_trigger); |
e32d7f27 | 1061 | free(session); |
7fdbed1c JG |
1062 | if (session_published) { |
1063 | /* | |
1a496780 JG |
1064 | * Notify after free-ing to ensure the memory is |
1065 | * reclaimed before the main thread exits (and prevent memory leak | |
1066 | * reports). | |
7fdbed1c | 1067 | */ |
1a496780 JG |
1068 | ASSERT_SESSION_LIST_LOCKED(); |
1069 | the_session_list.removal_cond.notify_all(); | |
7fdbed1c | 1070 | } |
e32d7f27 JG |
1071 | } |
1072 | ||
1073 | /* | |
1074 | * Acquire a reference to a session. | |
1075 | * This function may fail (return false); its return value must be checked. | |
1076 | */ | |
1077 | bool session_get(struct ltt_session *session) | |
1078 | { | |
d9a970b7 | 1079 | return urcu_ref_get_unless_zero(&session->ref_count); |
e32d7f27 JG |
1080 | } |
1081 | ||
1082 | /* | |
1083 | * Release a reference to a session. | |
1084 | */ | |
1085 | void session_put(struct ltt_session *session) | |
1086 | { | |
b178f53e JG |
1087 | if (!session) { |
1088 | return; | |
1089 | } | |
e32d7f27 JG |
1090 | /* |
1091 | * The session list lock must be held as any session_put() | |
1092 | * may cause the removal of the session from the session_list. | |
1093 | */ | |
1a496780 | 1094 | ASSERT_SESSION_LIST_LOCKED(); |
d9a970b7 JG |
1095 | LTTNG_ASSERT(session->ref_count.refcount); |
1096 | urcu_ref_put(&session->ref_count, session_release); | |
e32d7f27 JG |
1097 | } |
1098 | ||
1099 | /* | |
1100 | * Destroy a session. | |
1101 | * | |
1102 | * This method does not immediately release/free the session as other | |
1103 | * components may still hold a reference to the session. However, | |
1104 | * the session should no longer be presented to the user. | |
1105 | * | |
1106 | * Releases the session list's reference to the session | |
1107 | * and marks it as destroyed. Iterations on the session list should be | |
1108 | * mindful of the "destroyed" flag. | |
1109 | */ | |
1110 | void session_destroy(struct ltt_session *session) | |
1111 | { | |
ed41e570 JR |
1112 | int ret; |
1113 | struct lttng_ht_iter iter; | |
1114 | ||
a0377dfe | 1115 | LTTNG_ASSERT(!session->destroyed); |
e32d7f27 | 1116 | session->destroyed = true; |
ed41e570 JR |
1117 | |
1118 | /* | |
1119 | * Remove immediately from the "session by name" hash table. Only one | |
1120 | * session is expected to exist with a given name for at any given time. | |
1121 | * | |
1122 | * Even if a session still technically exists for a little while longer, | |
1123 | * there is no point in performing action on a "destroyed" session. | |
1124 | */ | |
1125 | iter.iter.node = &session->node_by_name.node; | |
1126 | ret = lttng_ht_del(ltt_sessions_ht_by_name, &iter); | |
1127 | LTTNG_ASSERT(!ret); | |
1128 | ||
e32d7f27 JG |
1129 | session_put(session); |
1130 | } | |
1131 | ||
3e3665b8 | 1132 | int session_add_destroy_notifier(struct ltt_session *session, |
28ab034a JG |
1133 | ltt_session_destroy_notifier notifier, |
1134 | void *user_data) | |
3e3665b8 | 1135 | { |
28ab034a JG |
1136 | const struct ltt_session_destroy_notifier_element element = { .notifier = notifier, |
1137 | .user_data = user_data }; | |
3e3665b8 | 1138 | |
28ab034a | 1139 | return lttng_dynamic_array_add_element(&session->destroy_notifiers, &element); |
3e3665b8 JG |
1140 | } |
1141 | ||
ccbdaca4 | 1142 | int session_add_clear_notifier(struct ltt_session *session, |
28ab034a JG |
1143 | ltt_session_clear_notifier notifier, |
1144 | void *user_data) | |
ccbdaca4 | 1145 | { |
28ab034a JG |
1146 | const struct ltt_session_clear_notifier_element element = { .notifier = notifier, |
1147 | .user_data = user_data }; | |
ccbdaca4 | 1148 | |
28ab034a | 1149 | return lttng_dynamic_array_add_element(&session->clear_notifiers, &element); |
ccbdaca4 MD |
1150 | } |
1151 | ||
5b74c7b1 | 1152 | /* |
b178f53e JG |
1153 | * Create a new session and add it to the session list. |
1154 | * Session list lock must be held by the caller. | |
5b74c7b1 | 1155 | */ |
28ab034a JG |
1156 | enum lttng_error_code |
1157 | session_create(const char *name, uid_t uid, gid_t gid, struct ltt_session **out_session) | |
5b74c7b1 | 1158 | { |
f3ed775e | 1159 | int ret; |
b178f53e | 1160 | enum lttng_error_code ret_code; |
cd9adb8b | 1161 | struct ltt_session *new_session = nullptr; |
e07ae692 | 1162 | |
1a496780 | 1163 | ASSERT_SESSION_LIST_LOCKED(); |
b178f53e JG |
1164 | if (name) { |
1165 | struct ltt_session *clashing_session; | |
1166 | ||
1167 | clashing_session = session_find_by_name(name); | |
1168 | if (clashing_session) { | |
1169 | session_put(clashing_session); | |
1170 | ret_code = LTTNG_ERR_EXIST_SESS; | |
1171 | goto error; | |
1172 | } | |
1173 | } | |
64803277 | 1174 | new_session = zmalloc<ltt_session>(); |
b178f53e JG |
1175 | if (!new_session) { |
1176 | PERROR("Failed to allocate an ltt_session structure"); | |
1177 | ret_code = LTTNG_ERR_NOMEM; | |
1178 | goto error; | |
5b74c7b1 DG |
1179 | } |
1180 | ||
3e3665b8 | 1181 | lttng_dynamic_array_init(&new_session->destroy_notifiers, |
28ab034a | 1182 | sizeof(struct ltt_session_destroy_notifier_element), |
cd9adb8b | 1183 | nullptr); |
ccbdaca4 | 1184 | lttng_dynamic_array_init(&new_session->clear_notifiers, |
28ab034a | 1185 | sizeof(struct ltt_session_clear_notifier_element), |
cd9adb8b | 1186 | nullptr); |
d9a970b7 JG |
1187 | urcu_ref_init(&new_session->ref_count); |
1188 | pthread_mutex_init(&new_session->_lock, nullptr); | |
e32d7f27 | 1189 | |
cd9adb8b | 1190 | new_session->creation_time = time(nullptr); |
b178f53e JG |
1191 | if (new_session->creation_time == (time_t) -1) { |
1192 | PERROR("Failed to sample session creation time"); | |
1193 | ret_code = LTTNG_ERR_SESSION_FAIL; | |
f3ed775e DG |
1194 | goto error; |
1195 | } | |
1196 | ||
b178f53e JG |
1197 | /* Create default consumer output. */ |
1198 | new_session->consumer = consumer_create_output(CONSUMER_DST_LOCAL); | |
cd9adb8b | 1199 | if (new_session->consumer == nullptr) { |
b178f53e | 1200 | ret_code = LTTNG_ERR_NOMEM; |
1c1c3634 DG |
1201 | goto error; |
1202 | } | |
1203 | ||
b178f53e JG |
1204 | if (name) { |
1205 | ret = lttng_strncpy(new_session->name, name, sizeof(new_session->name)); | |
1206 | if (ret) { | |
1207 | ret_code = LTTNG_ERR_SESSION_INVALID_CHAR; | |
1208 | goto error; | |
1209 | } | |
1210 | ret = validate_name(name); | |
1211 | if (ret < 0) { | |
1212 | ret_code = LTTNG_ERR_SESSION_INVALID_CHAR; | |
1213 | goto error; | |
1214 | } | |
1215 | } else { | |
1216 | int i = 0; | |
1217 | bool found_name = false; | |
1218 | char datetime[16]; | |
1219 | struct tm *timeinfo; | |
1220 | ||
1221 | timeinfo = localtime(&new_session->creation_time); | |
1222 | if (!timeinfo) { | |
1223 | ret_code = LTTNG_ERR_SESSION_FAIL; | |
1224 | goto error; | |
1225 | } | |
1226 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
1227 | for (i = 0; i < INT_MAX; i++) { | |
1228 | struct ltt_session *clashing_session; | |
1229 | ||
1230 | if (i == 0) { | |
1231 | ret = snprintf(new_session->name, | |
28ab034a JG |
1232 | sizeof(new_session->name), |
1233 | "%s-%s", | |
1234 | DEFAULT_SESSION_NAME, | |
1235 | datetime); | |
b178f53e JG |
1236 | } else { |
1237 | ret = snprintf(new_session->name, | |
28ab034a JG |
1238 | sizeof(new_session->name), |
1239 | "%s%d-%s", | |
1240 | DEFAULT_SESSION_NAME, | |
1241 | i, | |
1242 | datetime); | |
b178f53e | 1243 | } |
46ef2188 | 1244 | new_session->name_contains_creation_time = true; |
b178f53e JG |
1245 | if (ret == -1 || ret >= sizeof(new_session->name)) { |
1246 | /* | |
1247 | * Null-terminate in case the name is used | |
1248 | * in logging statements. | |
1249 | */ | |
1250 | new_session->name[sizeof(new_session->name) - 1] = '\0'; | |
1251 | ret_code = LTTNG_ERR_SESSION_FAIL; | |
1252 | goto error; | |
1253 | } | |
1254 | ||
28ab034a | 1255 | clashing_session = session_find_by_name(new_session->name); |
b178f53e JG |
1256 | session_put(clashing_session); |
1257 | if (!clashing_session) { | |
1258 | found_name = true; | |
1259 | break; | |
1260 | } | |
1261 | } | |
1262 | if (found_name) { | |
1263 | DBG("Generated session name \"%s\"", new_session->name); | |
1264 | new_session->has_auto_generated_name = true; | |
1265 | } else { | |
1266 | ERR("Failed to auto-generate a session name"); | |
1267 | ret_code = LTTNG_ERR_SESSION_FAIL; | |
1268 | goto error; | |
1269 | } | |
1270 | } | |
1271 | ||
d3e2ba59 | 1272 | ret = gethostname(new_session->hostname, sizeof(new_session->hostname)); |
73184835 DG |
1273 | if (ret < 0) { |
1274 | if (errno == ENAMETOOLONG) { | |
1275 | new_session->hostname[sizeof(new_session->hostname) - 1] = '\0'; | |
b178f53e | 1276 | ERR("Hostname exceeds the maximal permitted length and has been truncated to %s", |
28ab034a | 1277 | new_session->hostname); |
73184835 | 1278 | } else { |
b178f53e | 1279 | ret_code = LTTNG_ERR_SESSION_FAIL; |
73184835 DG |
1280 | goto error; |
1281 | } | |
d3e2ba59 JD |
1282 | } |
1283 | ||
6df2e2c9 MD |
1284 | new_session->uid = uid; |
1285 | new_session->gid = gid; | |
1286 | ||
6dc3064a DG |
1287 | ret = snapshot_init(&new_session->snapshot); |
1288 | if (ret < 0) { | |
b178f53e | 1289 | ret_code = LTTNG_ERR_NOMEM; |
6dc3064a DG |
1290 | goto error; |
1291 | } | |
1292 | ||
4f23c583 | 1293 | new_session->rotation_state = LTTNG_ROTATION_STATE_NO_ROTATION; |
92816cc3 | 1294 | |
b178f53e | 1295 | /* Add new session to the session list. */ |
a991f516 | 1296 | new_session->id = add_session_list(new_session); |
b178f53e | 1297 | |
23324029 JD |
1298 | /* |
1299 | * Add the new session to the ltt_sessions_ht_by_id. | |
1300 | * No ownership is taken by the hash table; it is merely | |
1301 | * a wrapper around the session list used for faster access | |
1302 | * by session id. | |
1303 | */ | |
1304 | add_session_ht(new_session); | |
f4cc5e83 | 1305 | new_session->published = true; |
b5541356 | 1306 | |
a4b92340 | 1307 | /* |
b178f53e JG |
1308 | * Consumer is left to NULL since the create_session_uri command will |
1309 | * set it up and, if valid, assign it to the session. | |
a4b92340 | 1310 | */ |
b178f53e | 1311 | DBG("Tracing session %s created with ID %" PRIu64 " by uid = %d, gid = %d", |
28ab034a JG |
1312 | new_session->name, |
1313 | new_session->id, | |
1314 | new_session->uid, | |
1315 | new_session->gid); | |
b178f53e JG |
1316 | ret_code = LTTNG_OK; |
1317 | end: | |
1318 | if (new_session) { | |
1319 | (void) session_get(new_session); | |
1320 | *out_session = new_session; | |
1321 | } | |
1322 | return ret_code; | |
5b74c7b1 | 1323 | error: |
f4cc5e83 | 1324 | session_put(new_session); |
cd9adb8b | 1325 | new_session = nullptr; |
b178f53e | 1326 | goto end; |
5b74c7b1 | 1327 | } |
2f77fc4b DG |
1328 | |
1329 | /* | |
d7b377ed | 1330 | * Check if the UID matches the session. Root user has access to all |
2f77fc4b DG |
1331 | * sessions. |
1332 | */ | |
d7b377ed | 1333 | bool session_access_ok(struct ltt_session *session, uid_t uid) |
2f77fc4b | 1334 | { |
a0377dfe | 1335 | LTTNG_ASSERT(session); |
d7b377ed | 1336 | return (uid == session->uid) || uid == 0; |
2f77fc4b | 1337 | } |
2961f09e JG |
1338 | |
1339 | /* | |
1340 | * Set a session's rotation state and reset all associated state. | |
1341 | * | |
1342 | * This function resets the rotation state (check timers, pending | |
1343 | * flags, etc.) and sets the result of the last rotation. The result | |
1344 | * can be queries by a liblttng-ctl client. | |
1345 | * | |
1346 | * Be careful of the result passed to this function. For instance, | |
1347 | * on failure to launch a rotation, a client will expect the rotation | |
83ed9e90 | 1348 | * state to be set to "NO_ROTATION". If an error occurred while the |
2961f09e JG |
1349 | * rotation was "ONGOING", result should be set to "ERROR", which will |
1350 | * allow a client to report it. | |
1351 | * | |
1352 | * Must be called with the session and session_list locks held. | |
1353 | */ | |
28f23191 | 1354 | int session_reset_rotation_state(ltt_session& session, enum lttng_rotation_state result) |
2961f09e JG |
1355 | { |
1356 | int ret = 0; | |
1357 | ||
1a496780 | 1358 | ASSERT_SESSION_LIST_LOCKED(); |
d9a970b7 | 1359 | ASSERT_LOCKED(session._lock); |
2961f09e | 1360 | |
0038180d JG |
1361 | session.rotation_state = result; |
1362 | if (session.rotation_pending_check_timer_enabled) { | |
2961f09e JG |
1363 | ret = timer_session_rotation_pending_check_stop(session); |
1364 | } | |
0038180d | 1365 | if (session.chunk_being_archived) { |
d2956687 JG |
1366 | uint64_t chunk_id; |
1367 | enum lttng_trace_chunk_status chunk_status; | |
1368 | ||
0038180d | 1369 | chunk_status = lttng_trace_chunk_get_id(session.chunk_being_archived, &chunk_id); |
a0377dfe | 1370 | LTTNG_ASSERT(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK); |
0038180d JG |
1371 | LTTNG_OPTIONAL_SET(&session.last_archived_chunk_id, chunk_id); |
1372 | lttng_trace_chunk_put(session.chunk_being_archived); | |
1373 | session.chunk_being_archived = nullptr; | |
ccbdaca4 MD |
1374 | /* |
1375 | * Fire the clear reply notifiers if we are completing a clear | |
1376 | * rotation. | |
1377 | */ | |
1378 | session_notify_clear(session); | |
d2956687 | 1379 | } |
2961f09e JG |
1380 | return ret; |
1381 | } | |
e1bbf989 JR |
1382 | |
1383 | /* | |
1384 | * Sample the id of a session looked up via its name. | |
1385 | * Here the term "sampling" hint the caller that this return the id at a given | |
1386 | * point in time with no guarantee that the session for which the id was | |
1387 | * sampled still exist at that point. | |
1388 | * | |
1389 | * Return 0 when the session is not found, | |
1390 | * Return 1 when the session is found and set `id`. | |
1391 | */ | |
1392 | bool sample_session_id_by_name(const char *name, uint64_t *id) | |
1393 | { | |
1394 | bool found = false; | |
1395 | struct lttng_ht_node_str *node; | |
1396 | struct lttng_ht_iter iter; | |
1397 | struct ltt_session *ls; | |
1398 | ||
56047f5a | 1399 | lttng::urcu::read_lock_guard read_lock; |
e1bbf989 JR |
1400 | |
1401 | if (!ltt_sessions_ht_by_name) { | |
1402 | found = false; | |
1403 | goto end; | |
1404 | } | |
1405 | ||
1406 | lttng_ht_lookup(ltt_sessions_ht_by_name, name, &iter); | |
1407 | node = lttng_ht_iter_get_node_str(&iter); | |
cd9adb8b | 1408 | if (node == nullptr) { |
e1bbf989 JR |
1409 | found = false; |
1410 | goto end; | |
1411 | } | |
1412 | ||
0114db0e | 1413 | ls = lttng::utils::container_of(node, <t_session::node_by_name); |
e1bbf989 JR |
1414 | *id = ls->id; |
1415 | found = true; | |
1416 | ||
1417 | DBG3("Session id `%" PRIu64 "` sampled for session `%s", *id, name); | |
1418 | end: | |
e1bbf989 JR |
1419 | return found; |
1420 | } | |
e99e3664 | 1421 | |
d9a970b7 | 1422 | void ltt_session::_locked_session_release(ltt_session *session) |
e99e3664 | 1423 | { |
0038180d JG |
1424 | if (!session) { |
1425 | return; | |
1426 | } | |
1427 | ||
e99e3664 JG |
1428 | session_unlock(session); |
1429 | session_put(session); | |
1430 | } | |
1431 | ||
d9a970b7 JG |
1432 | void ltt_session::_locked_const_session_release(const ltt_session *session) |
1433 | { | |
1434 | if (!session) { | |
1435 | return; | |
1436 | } | |
1437 | ||
1438 | ltt_session::_const_session_unlock(*session); | |
1439 | ltt_session::_const_session_put(session); | |
1440 | } | |
1441 | ||
1442 | ltt_session::locked_ref ltt_session::find_locked_session(ltt_session::id_t id) | |
e99e3664 JG |
1443 | { |
1444 | lttng::urcu::read_lock_guard rcu_lock; | |
1445 | auto session = session_find_by_id(id); | |
1446 | ||
1447 | if (!session) { | |
d9a970b7 | 1448 | LTTNG_THROW_SESSION_NOT_FOUND_BY_ID_ERROR(id); |
e99e3664 JG |
1449 | } |
1450 | ||
1451 | /* | |
1452 | * The pointer falling out of scope will unlock and release the reference to the | |
1453 | * session. | |
1454 | */ | |
1455 | session_lock(session); | |
77682be9 | 1456 | return ltt_session::locked_ref(session); |
e99e3664 JG |
1457 | } |
1458 | ||
d9a970b7 JG |
1459 | ltt_session::locked_ref ltt_session::find_locked_session(lttng::c_string_view name) |
1460 | { | |
1461 | lttng::urcu::read_lock_guard rcu_lock; | |
1462 | auto session = session_find_by_name(name.data()); | |
1463 | ||
1464 | if (!session) { | |
1465 | LTTNG_THROW_SESSION_NOT_FOUND_BY_NAME_ERROR(name.data()); | |
1466 | } | |
1467 | ||
1468 | session_lock(session); | |
1469 | return ltt_session::locked_ref(session); | |
1470 | } | |
1471 | ||
1472 | ltt_session::const_locked_ref ltt_session::find_locked_const_session(ltt_session::id_t id) | |
1473 | { | |
1474 | lttng::urcu::read_lock_guard rcu_lock; | |
1475 | auto session = session_find_by_id(id); | |
1476 | ||
1477 | if (!session) { | |
1478 | LTTNG_THROW_SESSION_NOT_FOUND_BY_ID_ERROR(id); | |
1479 | } | |
1480 | ||
1481 | session_lock(session); | |
1482 | return ltt_session::const_locked_ref(session); | |
1483 | } | |
1484 | ||
1485 | ltt_session::const_locked_ref ltt_session::find_locked_const_session(lttng::c_string_view name) | |
1486 | { | |
1487 | lttng::urcu::read_lock_guard rcu_lock; | |
1488 | auto session = session_find_by_name(name.data()); | |
1489 | ||
1490 | if (!session) { | |
1491 | LTTNG_THROW_SESSION_NOT_FOUND_BY_NAME_ERROR(name.data()); | |
1492 | } | |
1493 | ||
1494 | session_lock(session); | |
1495 | return ltt_session::const_locked_ref(session); | |
1496 | } | |
1497 | ||
1498 | ltt_session::ref ltt_session::find_session(ltt_session::id_t id) | |
1499 | { | |
1500 | lttng::urcu::read_lock_guard rcu_lock; | |
1501 | auto session = session_find_by_id(id); | |
1502 | ||
1503 | if (!session) { | |
1504 | LTTNG_THROW_SESSION_NOT_FOUND_BY_ID_ERROR(id); | |
1505 | } | |
1506 | ||
1507 | return ltt_session::ref(session); | |
1508 | } | |
1509 | ||
1510 | ltt_session::ref ltt_session::find_session(lttng::c_string_view name) | |
1511 | { | |
1512 | lttng::urcu::read_lock_guard rcu_lock; | |
1513 | auto session = session_find_by_name(name.data()); | |
1514 | ||
1515 | if (!session) { | |
1516 | LTTNG_THROW_SESSION_NOT_FOUND_BY_NAME_ERROR(name.data()); | |
1517 | } | |
1518 | ||
1519 | return ltt_session::ref(session); | |
1520 | } | |
1521 | ||
1522 | ltt_session::const_ref ltt_session::find_const_session(ltt_session::id_t id) | |
e99e3664 JG |
1523 | { |
1524 | lttng::urcu::read_lock_guard rcu_lock; | |
1525 | auto session = session_find_by_id(id); | |
1526 | ||
1527 | if (!session) { | |
d9a970b7 JG |
1528 | LTTNG_THROW_SESSION_NOT_FOUND_BY_ID_ERROR(id); |
1529 | } | |
1530 | ||
1531 | return ltt_session::const_ref(session); | |
1532 | } | |
1533 | ||
1534 | ltt_session::const_ref ltt_session::find_const_session(lttng::c_string_view name) | |
1535 | { | |
1536 | lttng::urcu::read_lock_guard rcu_lock; | |
1537 | auto session = session_find_by_name(name.data()); | |
1538 | ||
1539 | if (!session) { | |
1540 | LTTNG_THROW_SESSION_NOT_FOUND_BY_NAME_ERROR(name.data()); | |
e99e3664 JG |
1541 | } |
1542 | ||
d9a970b7 JG |
1543 | return ltt_session::const_ref(session); |
1544 | } | |
1545 | ||
1546 | void ltt_session::_const_session_put(const ltt_session *session) | |
1547 | { | |
1548 | /* | |
1549 | * The session list lock must be held as any session_put() | |
1550 | * may cause the removal of the session from the session_list. | |
1551 | */ | |
1552 | ASSERT_SESSION_LIST_LOCKED(); | |
1553 | LTTNG_ASSERT(session->ref_count.refcount); | |
1554 | urcu_ref_put(&session->ref_count, session_release); | |
1555 | } | |
1556 | ||
1557 | std::unique_lock<std::mutex> ls::lock_session_list() | |
1558 | { | |
1559 | return std::unique_lock<std::mutex>(the_session_list.lock); | |
e99e3664 | 1560 | } |