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. | |
dd73d57b | 221 | */ |
a0a4f314 | 222 | enum consumer_dst_type session_get_consumer_destination_type(const ltt_session::locked_ref& session) |
dd73d57b JG |
223 | { |
224 | /* | |
225 | * The output information is duplicated in both of those session types. | |
226 | * Hence, it doesn't matter from which it is retrieved. However, it is | |
227 | * possible for only one of them to be set. | |
228 | */ | |
28ab034a JG |
229 | return session->kernel_session ? session->kernel_session->consumer->type : |
230 | session->ust_session->consumer->type; | |
dd73d57b JG |
231 | } |
232 | ||
233 | /* | |
234 | * Get the session's consumer network hostname. | |
235 | * The caller must ensure that the destination is of type "net". | |
dd73d57b | 236 | */ |
a0a4f314 | 237 | const char *session_get_net_consumer_hostname(const ltt_session::locked_ref& session) |
dd73d57b | 238 | { |
cd9adb8b | 239 | const char *hostname = nullptr; |
dd73d57b JG |
240 | const struct consumer_output *output; |
241 | ||
28ab034a JG |
242 | output = session->kernel_session ? session->kernel_session->consumer : |
243 | session->ust_session->consumer; | |
dd73d57b JG |
244 | |
245 | /* | |
246 | * hostname is assumed to be the same for both control and data | |
247 | * connections. | |
248 | */ | |
249 | switch (output->dst.net.control.dtype) { | |
250 | case LTTNG_DST_IPV4: | |
251 | hostname = output->dst.net.control.dst.ipv4; | |
252 | break; | |
253 | case LTTNG_DST_IPV6: | |
254 | hostname = output->dst.net.control.dst.ipv6; | |
255 | break; | |
256 | default: | |
257 | abort(); | |
258 | } | |
259 | return hostname; | |
260 | } | |
261 | ||
262 | /* | |
263 | * Get the session's consumer network control and data ports. | |
264 | * The caller must ensure that the destination is of type "net". | |
dd73d57b | 265 | */ |
a0a4f314 | 266 | void session_get_net_consumer_ports(const ltt_session::locked_ref& session, |
28ab034a JG |
267 | uint16_t *control_port, |
268 | uint16_t *data_port) | |
dd73d57b JG |
269 | { |
270 | const struct consumer_output *output; | |
271 | ||
28ab034a JG |
272 | output = session->kernel_session ? session->kernel_session->consumer : |
273 | session->ust_session->consumer; | |
dd73d57b JG |
274 | *control_port = output->dst.net.control.port; |
275 | *data_port = output->dst.net.data.port; | |
276 | } | |
277 | ||
5d65beab JG |
278 | /* |
279 | * Get the location of the latest trace archive produced by a rotation. | |
5d65beab | 280 | */ |
28ab034a | 281 | struct lttng_trace_archive_location * |
a0a4f314 | 282 | session_get_trace_archive_location(const ltt_session::locked_ref& session) |
5d65beab | 283 | { |
d2956687 | 284 | int ret; |
cd9adb8b JG |
285 | struct lttng_trace_archive_location *location = nullptr; |
286 | char *chunk_path = nullptr; | |
d2956687 JG |
287 | |
288 | if (session->rotation_state != LTTNG_ROTATION_STATE_COMPLETED || | |
28ab034a | 289 | !session->last_archived_chunk_name) { |
d2956687 JG |
290 | goto end; |
291 | } | |
5d65beab | 292 | |
5d65beab JG |
293 | switch (session_get_consumer_destination_type(session)) { |
294 | case CONSUMER_DST_LOCAL: | |
ecd1a12f | 295 | ret = asprintf(&chunk_path, |
28ab034a JG |
296 | "%s/" DEFAULT_ARCHIVED_TRACE_CHUNKS_DIRECTORY "/%s", |
297 | session_get_base_path(session), | |
298 | session->last_archived_chunk_name); | |
ecd1a12f MD |
299 | if (ret == -1) { |
300 | goto end; | |
301 | } | |
28ab034a | 302 | location = lttng_trace_archive_location_local_create(chunk_path); |
5d65beab JG |
303 | break; |
304 | case CONSUMER_DST_NET: | |
305 | { | |
306 | const char *hostname; | |
307 | uint16_t control_port, data_port; | |
308 | ||
309 | hostname = session_get_net_consumer_hostname(session); | |
28ab034a | 310 | session_get_net_consumer_ports(session, &control_port, &data_port); |
5d65beab | 311 | location = lttng_trace_archive_location_relay_create( |
28ab034a JG |
312 | hostname, |
313 | LTTNG_TRACE_ARCHIVE_LOCATION_RELAY_PROTOCOL_TYPE_TCP, | |
314 | control_port, | |
315 | data_port, | |
316 | session->last_chunk_path); | |
5d65beab JG |
317 | break; |
318 | } | |
319 | default: | |
320 | abort(); | |
321 | } | |
322 | end: | |
d2956687 | 323 | free(chunk_path); |
5d65beab JG |
324 | return location; |
325 | } | |
326 | ||
23324029 | 327 | /* |
e1bbf989 | 328 | * Allocate the ltt_sessions_ht_by_id and ltt_sessions_ht_by_name HT. |
9c6518bc JG |
329 | * |
330 | * The session list lock must be held. | |
23324029 | 331 | */ |
cd9adb8b | 332 | static int ltt_sessions_ht_alloc() |
23324029 JD |
333 | { |
334 | int ret = 0; | |
335 | ||
336 | DBG("Allocating ltt_sessions_ht_by_id"); | |
337 | ltt_sessions_ht_by_id = lttng_ht_new(0, LTTNG_HT_TYPE_U64); | |
338 | if (!ltt_sessions_ht_by_id) { | |
339 | ret = -1; | |
340 | ERR("Failed to allocate ltt_sessions_ht_by_id"); | |
341 | goto end; | |
342 | } | |
e1bbf989 JR |
343 | |
344 | DBG("Allocating ltt_sessions_ht_by_name"); | |
345 | ltt_sessions_ht_by_name = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
346 | if (!ltt_sessions_ht_by_name) { | |
347 | ret = -1; | |
348 | ERR("Failed to allocate ltt_sessions_ht_by_name"); | |
349 | goto end; | |
350 | } | |
351 | ||
23324029 JD |
352 | end: |
353 | return ret; | |
354 | } | |
355 | ||
356 | /* | |
357 | * Destroy the ltt_sessions_ht_by_id HT. | |
9c6518bc JG |
358 | * |
359 | * The session list lock must be held. | |
23324029 | 360 | */ |
cd9adb8b | 361 | static void ltt_sessions_ht_destroy() |
23324029 | 362 | { |
e1bbf989 | 363 | if (ltt_sessions_ht_by_id) { |
3c339053 | 364 | lttng_ht_destroy(ltt_sessions_ht_by_id); |
cd9adb8b | 365 | ltt_sessions_ht_by_id = nullptr; |
e1bbf989 JR |
366 | } |
367 | ||
368 | if (ltt_sessions_ht_by_name) { | |
3c339053 | 369 | lttng_ht_destroy(ltt_sessions_ht_by_name); |
cd9adb8b | 370 | ltt_sessions_ht_by_name = nullptr; |
23324029 | 371 | } |
e1bbf989 JR |
372 | |
373 | return; | |
23324029 JD |
374 | } |
375 | ||
376 | /* | |
e1bbf989 JR |
377 | * Add a ltt_session to the ltt_sessions_ht_by_id and ltt_sessions_ht_by_name. |
378 | * If unallocated, the ltt_sessions_ht_by_id and ltt_sessions_ht_by_name. HTs | |
379 | * are allocated. The session list lock must be held. | |
23324029 JD |
380 | */ |
381 | static void add_session_ht(struct ltt_session *ls) | |
382 | { | |
383 | int ret; | |
384 | ||
a0377dfe | 385 | LTTNG_ASSERT(ls); |
23324029 JD |
386 | |
387 | if (!ltt_sessions_ht_by_id) { | |
388 | ret = ltt_sessions_ht_alloc(); | |
389 | if (ret) { | |
390 | ERR("Error allocating the sessions HT"); | |
391 | goto end; | |
392 | } | |
393 | } | |
e1bbf989 JR |
394 | |
395 | /* Should always be present with ltt_sessions_ht_by_id. */ | |
a0377dfe | 396 | LTTNG_ASSERT(ltt_sessions_ht_by_name); |
e1bbf989 | 397 | |
23324029 JD |
398 | lttng_ht_node_init_u64(&ls->node, ls->id); |
399 | lttng_ht_add_unique_u64(ltt_sessions_ht_by_id, &ls->node); | |
400 | ||
e1bbf989 JR |
401 | lttng_ht_node_init_str(&ls->node_by_name, ls->name); |
402 | lttng_ht_add_unique_str(ltt_sessions_ht_by_name, &ls->node_by_name); | |
403 | ||
23324029 JD |
404 | end: |
405 | return; | |
406 | } | |
407 | ||
408 | /* | |
e1bbf989 | 409 | * Test if ltt_sessions_ht_by_id/name are empty. |
2a6ebf6b | 410 | * Return `false` if hash table objects are null. |
23324029 JD |
411 | * The session list lock must be held. |
412 | */ | |
cd9adb8b | 413 | static bool ltt_sessions_ht_empty() |
23324029 | 414 | { |
2a6ebf6b | 415 | bool empty = false; |
23324029 JD |
416 | |
417 | if (!ltt_sessions_ht_by_id) { | |
2a6ebf6b | 418 | /* The hash tables do not exist yet. */ |
23324029 JD |
419 | goto end; |
420 | } | |
421 | ||
a0377dfe | 422 | LTTNG_ASSERT(ltt_sessions_ht_by_name); |
e1bbf989 | 423 | |
6f729565 | 424 | if (lttng_ht_get_count(ltt_sessions_ht_by_id) != 0) { |
2a6ebf6b JR |
425 | /* Not empty.*/ |
426 | goto end; | |
427 | } | |
428 | ||
429 | /* | |
430 | * At this point it is expected that the `ltt_sessions_ht_by_name` ht is | |
431 | * empty. | |
432 | * | |
433 | * The removal from both hash tables is done in two different | |
434 | * places: | |
435 | * - removal from `ltt_sessions_ht_by_name` is done during | |
436 | * `session_destroy()` | |
437 | * - removal from `ltt_sessions_ht_by_id` is done later | |
438 | * in `session_release()` on the last reference put. | |
439 | * | |
440 | * This means that it is possible for `ltt_sessions_ht_by_name` to be | |
441 | * empty but for `ltt_sessions_ht_by_id` to still contain objects when | |
442 | * multiple sessions exists. The reverse is false, hence this sanity | |
443 | * check. | |
444 | */ | |
445 | LTTNG_ASSERT(lttng_ht_get_count(ltt_sessions_ht_by_name) == 0); | |
446 | empty = true; | |
23324029 | 447 | end: |
2a6ebf6b | 448 | return empty; |
23324029 JD |
449 | } |
450 | ||
451 | /* | |
ed41e570 | 452 | * Remove a ltt_session from the ltt_sessions_ht_by_id. |
e1bbf989 | 453 | * If empty, the ltt_sessions_ht_by_id/name HTs are freed. |
23324029 JD |
454 | * The session list lock must be held. |
455 | */ | |
456 | static void del_session_ht(struct ltt_session *ls) | |
457 | { | |
458 | struct lttng_ht_iter iter; | |
459 | int ret; | |
460 | ||
a0377dfe FD |
461 | LTTNG_ASSERT(ls); |
462 | LTTNG_ASSERT(ltt_sessions_ht_by_id); | |
463 | LTTNG_ASSERT(ltt_sessions_ht_by_name); | |
23324029 JD |
464 | |
465 | iter.iter.node = &ls->node.node; | |
466 | ret = lttng_ht_del(ltt_sessions_ht_by_id, &iter); | |
a0377dfe | 467 | LTTNG_ASSERT(!ret); |
23324029 JD |
468 | |
469 | if (ltt_sessions_ht_empty()) { | |
e1bbf989 | 470 | DBG("Empty ltt_sessions_ht_by_id/name, destroying hast tables"); |
23324029 JD |
471 | ltt_sessions_ht_destroy(); |
472 | } | |
473 | } | |
474 | ||
b5541356 | 475 | /* |
6c9cc2ab | 476 | * Acquire session lock |
b5541356 | 477 | */ |
54d01ffb | 478 | void session_lock(struct ltt_session *session) |
b5541356 | 479 | { |
a0377dfe | 480 | LTTNG_ASSERT(session); |
d9a970b7 JG |
481 | session->lock(); |
482 | } | |
0525e9ae | 483 | |
d9a970b7 JG |
484 | void ltt_session::lock() const noexcept |
485 | { | |
486 | pthread_mutex_lock(&_lock); | |
487 | } | |
488 | ||
489 | void ltt_session::unlock() const noexcept | |
490 | { | |
491 | ltt_session::_const_session_unlock(*this); | |
6c9cc2ab | 492 | } |
b5541356 | 493 | |
6c9cc2ab DG |
494 | /* |
495 | * Release session lock | |
496 | */ | |
54d01ffb | 497 | void session_unlock(struct ltt_session *session) |
6c9cc2ab | 498 | { |
a0377dfe | 499 | LTTNG_ASSERT(session); |
d9a970b7 JG |
500 | session->unlock(); |
501 | } | |
0525e9ae | 502 | |
a0a4f314 | 503 | void ltt_session::_const_session_unlock(const ltt_session& session) |
d9a970b7 JG |
504 | { |
505 | pthread_mutex_unlock(&session._lock); | |
b5541356 DG |
506 | } |
507 | ||
a0a4f314 | 508 | static int _session_set_trace_chunk_no_lock_check(const ltt_session::locked_ref& session, |
28ab034a JG |
509 | struct lttng_trace_chunk *new_trace_chunk, |
510 | struct lttng_trace_chunk **_current_trace_chunk) | |
82b69413 | 511 | { |
78fc586b | 512 | int ret = 0; |
82b69413 | 513 | unsigned int i, refs_to_acquire = 0, refs_acquired = 0, refs_to_release = 0; |
82b69413 JG |
514 | struct cds_lfht_iter iter; |
515 | struct consumer_socket *socket; | |
d2956687 JG |
516 | struct lttng_trace_chunk *current_trace_chunk; |
517 | uint64_t chunk_id; | |
518 | enum lttng_trace_chunk_status chunk_status; | |
82b69413 | 519 | |
56047f5a | 520 | lttng::urcu::read_lock_guard read_lock; |
82b69413 | 521 | /* |
d2956687 JG |
522 | * Ownership of current trace chunk is transferred to |
523 | * `current_trace_chunk`. | |
82b69413 | 524 | */ |
d2956687 | 525 | current_trace_chunk = session->current_trace_chunk; |
cd9adb8b | 526 | session->current_trace_chunk = nullptr; |
82b69413 | 527 | if (session->ust_session) { |
28ab034a | 528 | lttng_trace_chunk_put(session->ust_session->current_trace_chunk); |
cd9adb8b | 529 | session->ust_session->current_trace_chunk = nullptr; |
82b69413 JG |
530 | } |
531 | if (session->kernel_session) { | |
28ab034a | 532 | lttng_trace_chunk_put(session->kernel_session->current_trace_chunk); |
cd9adb8b | 533 | session->kernel_session->current_trace_chunk = nullptr; |
82b69413 | 534 | } |
d2956687 JG |
535 | if (!new_trace_chunk) { |
536 | ret = 0; | |
537 | goto end; | |
82b69413 | 538 | } |
d2956687 | 539 | chunk_status = lttng_trace_chunk_get_id(new_trace_chunk, &chunk_id); |
a0377dfe | 540 | LTTNG_ASSERT(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK); |
82b69413 | 541 | |
d2956687 JG |
542 | refs_to_acquire = 1; |
543 | refs_to_acquire += !!session->ust_session; | |
544 | refs_to_acquire += !!session->kernel_session; | |
545 | ||
28ab034a | 546 | for (refs_acquired = 0; refs_acquired < refs_to_acquire; refs_acquired++) { |
d2956687 JG |
547 | if (!lttng_trace_chunk_get(new_trace_chunk)) { |
548 | ERR("Failed to acquire reference to new trace chunk of session \"%s\"", | |
28ab034a | 549 | session->name); |
d2956687 | 550 | goto error; |
82b69413 JG |
551 | } |
552 | } | |
553 | ||
d2956687 | 554 | if (session->ust_session) { |
28ab034a JG |
555 | const uint64_t relayd_id = session->ust_session->consumer->net_seq_index; |
556 | const bool is_local_trace = session->ust_session->consumer->type == | |
557 | CONSUMER_DST_LOCAL; | |
e5add6d0 | 558 | |
d2956687 | 559 | session->ust_session->current_trace_chunk = new_trace_chunk; |
f8a37411 | 560 | if (is_local_trace) { |
d2956687 | 561 | enum lttng_error_code ret_error_code; |
82b69413 | 562 | |
28ab034a JG |
563 | ret_error_code = |
564 | ust_app_create_channel_subdirectories(session->ust_session); | |
d2956687 | 565 | if (ret_error_code != LTTNG_OK) { |
82b69413 JG |
566 | goto error; |
567 | } | |
f8a37411 | 568 | } |
28ab034a JG |
569 | cds_lfht_for_each_entry ( |
570 | session->ust_session->consumer->socks->ht, &iter, socket, node.node) { | |
d2956687 JG |
571 | pthread_mutex_lock(socket->lock); |
572 | ret = consumer_create_trace_chunk(socket, | |
28ab034a JG |
573 | relayd_id, |
574 | session->id, | |
575 | new_trace_chunk, | |
576 | DEFAULT_UST_TRACE_DIR); | |
d2956687 | 577 | pthread_mutex_unlock(socket->lock); |
f8a37411 | 578 | if (ret) { |
d2956687 | 579 | goto error; |
f8a37411 JG |
580 | } |
581 | } | |
582 | } | |
82b69413 | 583 | if (session->kernel_session) { |
28ab034a JG |
584 | const uint64_t relayd_id = session->kernel_session->consumer->net_seq_index; |
585 | const bool is_local_trace = session->kernel_session->consumer->type == | |
586 | CONSUMER_DST_LOCAL; | |
e5add6d0 | 587 | |
d2956687 JG |
588 | session->kernel_session->current_trace_chunk = new_trace_chunk; |
589 | if (is_local_trace) { | |
590 | enum lttng_error_code ret_error_code; | |
591 | ||
28ab034a JG |
592 | ret_error_code = |
593 | kernel_create_channel_subdirectories(session->kernel_session); | |
d2956687 | 594 | if (ret_error_code != LTTNG_OK) { |
d2956687 JG |
595 | goto error; |
596 | } | |
f8a37411 | 597 | } |
28ab034a JG |
598 | cds_lfht_for_each_entry ( |
599 | session->kernel_session->consumer->socks->ht, &iter, socket, node.node) { | |
d2956687 JG |
600 | pthread_mutex_lock(socket->lock); |
601 | ret = consumer_create_trace_chunk(socket, | |
28ab034a JG |
602 | relayd_id, |
603 | session->id, | |
604 | new_trace_chunk, | |
605 | DEFAULT_KERNEL_TRACE_DIR); | |
d2956687 | 606 | pthread_mutex_unlock(socket->lock); |
f8a37411 | 607 | if (ret) { |
d2956687 | 608 | goto error; |
f8a37411 JG |
609 | } |
610 | } | |
611 | } | |
82b69413 JG |
612 | |
613 | /* | |
614 | * Update local current trace chunk state last, only if all remote | |
d2956687 | 615 | * creations succeeded. |
82b69413 JG |
616 | */ |
617 | session->current_trace_chunk = new_trace_chunk; | |
d2956687 JG |
618 | LTTNG_OPTIONAL_SET(&session->most_recent_chunk_id, chunk_id); |
619 | end: | |
620 | if (_current_trace_chunk) { | |
621 | *_current_trace_chunk = current_trace_chunk; | |
cd9adb8b | 622 | current_trace_chunk = nullptr; |
d2956687 JG |
623 | } |
624 | end_no_move: | |
d2956687 JG |
625 | lttng_trace_chunk_put(current_trace_chunk); |
626 | return ret; | |
627 | error: | |
82b69413 | 628 | if (session->ust_session) { |
cd9adb8b | 629 | session->ust_session->current_trace_chunk = nullptr; |
82b69413 JG |
630 | } |
631 | if (session->kernel_session) { | |
cd9adb8b | 632 | session->kernel_session->current_trace_chunk = nullptr; |
82b69413 | 633 | } |
f8a37411 | 634 | /* |
82b69413 JG |
635 | * Release references taken in the case where all references could not |
636 | * be acquired. | |
637 | */ | |
638 | refs_to_release = refs_to_acquire - refs_acquired; | |
639 | for (i = 0; i < refs_to_release; i++) { | |
640 | lttng_trace_chunk_put(new_trace_chunk); | |
641 | } | |
d2956687 JG |
642 | ret = -1; |
643 | goto end_no_move; | |
82b69413 JG |
644 | } |
645 | ||
28ab034a | 646 | struct lttng_trace_chunk * |
a0a4f314 | 647 | session_create_new_trace_chunk(const ltt_session::locked_ref& session, |
28ab034a JG |
648 | const struct consumer_output *consumer_output_override, |
649 | const char *session_base_path_override, | |
650 | const char *chunk_name_override) | |
82b69413 JG |
651 | { |
652 | int ret; | |
cd9adb8b | 653 | struct lttng_trace_chunk *trace_chunk = nullptr; |
82b69413 | 654 | enum lttng_trace_chunk_status chunk_status; |
cd9adb8b | 655 | const time_t chunk_creation_ts = time(nullptr); |
348a81dc JG |
656 | bool is_local_trace; |
657 | const char *base_path; | |
cd9adb8b | 658 | struct lttng_directory_handle *session_output_directory = nullptr; |
82b69413 | 659 | const struct lttng_credentials session_credentials = { |
ff588497 JR |
660 | .uid = LTTNG_OPTIONAL_INIT_VALUE(session->uid), |
661 | .gid = LTTNG_OPTIONAL_INIT_VALUE(session->gid), | |
82b69413 JG |
662 | }; |
663 | uint64_t next_chunk_id; | |
348a81dc | 664 | const struct consumer_output *output; |
a7ceb342 | 665 | const char *new_path; |
348a81dc JG |
666 | |
667 | if (consumer_output_override) { | |
668 | output = consumer_output_override; | |
669 | } else { | |
a0377dfe | 670 | LTTNG_ASSERT(session->ust_session || session->kernel_session); |
28ab034a JG |
671 | output = session->ust_session ? session->ust_session->consumer : |
672 | session->kernel_session->consumer; | |
348a81dc JG |
673 | } |
674 | ||
675 | is_local_trace = output->type == CONSUMER_DST_LOCAL; | |
28ab034a | 676 | base_path = session_base_path_override ?: consumer_output_get_base_path(output); |
82b69413 | 677 | |
d2956687 JG |
678 | if (chunk_creation_ts == (time_t) -1) { |
679 | PERROR("Failed to sample time while creation session \"%s\" trace chunk", | |
28ab034a | 680 | session->name); |
82b69413 JG |
681 | goto error; |
682 | } | |
82b69413 | 683 | |
28ab034a JG |
684 | next_chunk_id = |
685 | session->most_recent_chunk_id.is_set ? session->most_recent_chunk_id.value + 1 : 0; | |
82b69413 | 686 | |
a7ceb342 | 687 | if (session->current_trace_chunk && |
28ab034a | 688 | !lttng_trace_chunk_get_name_overridden(session->current_trace_chunk)) { |
a7ceb342 | 689 | chunk_status = lttng_trace_chunk_rename_path(session->current_trace_chunk, |
28ab034a | 690 | DEFAULT_CHUNK_TMP_OLD_DIRECTORY); |
a7ceb342 MD |
691 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { |
692 | goto error; | |
693 | } | |
694 | } | |
695 | if (!session->current_trace_chunk) { | |
696 | if (!session->rotated) { | |
697 | new_path = ""; | |
698 | } else { | |
cd9adb8b | 699 | new_path = nullptr; |
a7ceb342 MD |
700 | } |
701 | } else { | |
702 | new_path = DEFAULT_CHUNK_TMP_NEW_DIRECTORY; | |
703 | } | |
704 | ||
28ab034a | 705 | trace_chunk = lttng_trace_chunk_create(next_chunk_id, chunk_creation_ts, new_path); |
82b69413 | 706 | if (!trace_chunk) { |
82b69413 JG |
707 | goto error; |
708 | } | |
709 | ||
710 | if (chunk_name_override) { | |
28ab034a | 711 | chunk_status = lttng_trace_chunk_override_name(trace_chunk, chunk_name_override); |
d2956687 | 712 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { |
82b69413 JG |
713 | goto error; |
714 | } | |
715 | } | |
716 | ||
717 | if (!is_local_trace) { | |
718 | /* | |
719 | * No need to set crendentials and output directory | |
720 | * for remote trace chunks. | |
721 | */ | |
d2956687 | 722 | goto end; |
82b69413 JG |
723 | } |
724 | ||
28ab034a | 725 | chunk_status = lttng_trace_chunk_set_credentials(trace_chunk, &session_credentials); |
82b69413 | 726 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { |
82b69413 JG |
727 | goto error; |
728 | } | |
729 | ||
28ab034a JG |
730 | DBG("Creating base output directory of session \"%s\" at %s", session->name, base_path); |
731 | ret = utils_mkdir_recursive(base_path, S_IRWXU | S_IRWXG, session->uid, session->gid); | |
82b69413 | 732 | if (ret) { |
82b69413 JG |
733 | goto error; |
734 | } | |
cbf53d23 JG |
735 | session_output_directory = lttng_directory_handle_create(base_path); |
736 | if (!session_output_directory) { | |
82b69413 JG |
737 | goto error; |
738 | } | |
28ab034a | 739 | chunk_status = lttng_trace_chunk_set_as_owner(trace_chunk, session_output_directory); |
cbf53d23 | 740 | lttng_directory_handle_put(session_output_directory); |
cd9adb8b | 741 | session_output_directory = nullptr; |
82b69413 | 742 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { |
82b69413 JG |
743 | goto error; |
744 | } | |
d2956687 JG |
745 | end: |
746 | return trace_chunk; | |
82b69413 | 747 | error: |
cbf53d23 | 748 | lttng_directory_handle_put(session_output_directory); |
82b69413 | 749 | lttng_trace_chunk_put(trace_chunk); |
cd9adb8b | 750 | trace_chunk = nullptr; |
d2956687 JG |
751 | goto end; |
752 | } | |
753 | ||
a0a4f314 | 754 | int session_close_trace_chunk(const ltt_session::locked_ref& session, |
28ab034a JG |
755 | struct lttng_trace_chunk *trace_chunk, |
756 | enum lttng_trace_chunk_command_type close_command, | |
757 | char *closed_trace_chunk_path) | |
d2956687 JG |
758 | { |
759 | int ret = 0; | |
760 | bool error_occurred = false; | |
761 | struct cds_lfht_iter iter; | |
762 | struct consumer_socket *socket; | |
763 | enum lttng_trace_chunk_status chunk_status; | |
cd9adb8b | 764 | const time_t chunk_close_timestamp = time(nullptr); |
a7ceb342 | 765 | const char *new_path; |
d2956687 | 766 | |
28ab034a | 767 | chunk_status = lttng_trace_chunk_set_close_command(trace_chunk, close_command); |
343defc2 MD |
768 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { |
769 | ret = -1; | |
770 | goto end; | |
bbc4768c JG |
771 | } |
772 | ||
d2956687 JG |
773 | if (chunk_close_timestamp == (time_t) -1) { |
774 | ERR("Failed to sample the close timestamp of the current trace chunk of session \"%s\"", | |
28ab034a | 775 | session->name); |
d2956687 JG |
776 | ret = -1; |
777 | goto end; | |
778 | } | |
a7ceb342 MD |
779 | |
780 | if (close_command == LTTNG_TRACE_CHUNK_COMMAND_TYPE_DELETE && !session->rotated) { | |
781 | /* New chunk stays in session output directory. */ | |
782 | new_path = ""; | |
783 | } else { | |
784 | /* Use chunk name for new chunk. */ | |
cd9adb8b | 785 | new_path = nullptr; |
a7ceb342 MD |
786 | } |
787 | if (session->current_trace_chunk && | |
28ab034a | 788 | !lttng_trace_chunk_get_name_overridden(session->current_trace_chunk)) { |
a7ceb342 | 789 | /* Rename new chunk path. */ |
28ab034a JG |
790 | chunk_status = |
791 | lttng_trace_chunk_rename_path(session->current_trace_chunk, new_path); | |
a7ceb342 MD |
792 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { |
793 | ret = -1; | |
794 | goto end; | |
795 | } | |
796 | } | |
797 | if (!lttng_trace_chunk_get_name_overridden(trace_chunk) && | |
28ab034a | 798 | close_command == LTTNG_TRACE_CHUNK_COMMAND_TYPE_NO_OPERATION) { |
a7ceb342 MD |
799 | const char *old_path; |
800 | ||
801 | if (!session->rotated) { | |
802 | old_path = ""; | |
803 | } else { | |
cd9adb8b | 804 | old_path = nullptr; |
a7ceb342 MD |
805 | } |
806 | /* We need to move back the .tmp_old_chunk to its rightful place. */ | |
28ab034a | 807 | chunk_status = lttng_trace_chunk_rename_path(trace_chunk, old_path); |
a7ceb342 MD |
808 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { |
809 | ret = -1; | |
810 | goto end; | |
811 | } | |
812 | } | |
813 | if (close_command == LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED) { | |
814 | session->rotated = true; | |
815 | } | |
28ab034a | 816 | chunk_status = lttng_trace_chunk_set_close_timestamp(trace_chunk, chunk_close_timestamp); |
d2956687 JG |
817 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { |
818 | ERR("Failed to set the close timestamp of the current trace chunk of session \"%s\"", | |
28ab034a | 819 | session->name); |
d2956687 JG |
820 | ret = -1; |
821 | goto end; | |
822 | } | |
823 | ||
824 | if (session->ust_session) { | |
28ab034a | 825 | const uint64_t relayd_id = session->ust_session->consumer->net_seq_index; |
0a184d4e | 826 | |
28ab034a JG |
827 | cds_lfht_for_each_entry ( |
828 | session->ust_session->consumer->socks->ht, &iter, socket, node.node) { | |
d2956687 JG |
829 | pthread_mutex_lock(socket->lock); |
830 | ret = consumer_close_trace_chunk(socket, | |
28ab034a JG |
831 | relayd_id, |
832 | session->id, | |
833 | trace_chunk, | |
834 | closed_trace_chunk_path); | |
d2956687 JG |
835 | pthread_mutex_unlock(socket->lock); |
836 | if (ret) { | |
837 | ERR("Failed to close trace chunk on user space consumer"); | |
838 | error_occurred = true; | |
839 | } | |
840 | } | |
841 | } | |
842 | if (session->kernel_session) { | |
28ab034a | 843 | const uint64_t relayd_id = session->kernel_session->consumer->net_seq_index; |
0a184d4e | 844 | |
28ab034a JG |
845 | cds_lfht_for_each_entry ( |
846 | session->kernel_session->consumer->socks->ht, &iter, socket, node.node) { | |
d2956687 JG |
847 | pthread_mutex_lock(socket->lock); |
848 | ret = consumer_close_trace_chunk(socket, | |
28ab034a JG |
849 | relayd_id, |
850 | session->id, | |
851 | trace_chunk, | |
852 | closed_trace_chunk_path); | |
d2956687 JG |
853 | pthread_mutex_unlock(socket->lock); |
854 | if (ret) { | |
855 | ERR("Failed to close trace chunk on kernel consumer"); | |
856 | error_occurred = true; | |
857 | } | |
858 | } | |
859 | } | |
860 | ret = error_occurred ? -1 : 0; | |
82b69413 | 861 | end: |
d2956687 | 862 | return ret; |
82b69413 JG |
863 | } |
864 | ||
04ed9e10 JG |
865 | /* |
866 | * This function skips the metadata channel as the begin/end timestamps of a | |
867 | * metadata packet are useless. | |
868 | * | |
869 | * Moreover, opening a packet after a "clear" will cause problems for live | |
870 | * sessions as it will introduce padding that was not part of the first trace | |
871 | * chunk. The relay daemon expects the content of the metadata stream of | |
872 | * successive metadata trace chunks to be strict supersets of one another. | |
873 | * | |
874 | * For example, flushing a packet at the beginning of the metadata stream of | |
875 | * a trace chunk resulting from a "clear" session command will cause the | |
876 | * size of the metadata stream of the new trace chunk to not match the size of | |
877 | * the metadata stream of the original chunk. This will confuse the relay | |
878 | * daemon as the same "offset" in a metadata stream will no longer point | |
879 | * to the same content. | |
880 | */ | |
a0a4f314 | 881 | static enum lttng_error_code session_kernel_open_packets(const ltt_session::locked_ref& session) |
04ed9e10 JG |
882 | { |
883 | enum lttng_error_code ret = LTTNG_OK; | |
884 | struct consumer_socket *socket; | |
885 | struct lttng_ht_iter iter; | |
886 | struct cds_lfht_node *node; | |
887 | struct ltt_kernel_channel *chan; | |
888 | ||
56047f5a | 889 | lttng::urcu::read_lock_guard read_lock; |
04ed9e10 JG |
890 | |
891 | cds_lfht_first(session->kernel_session->consumer->socks->ht, &iter.iter); | |
892 | node = cds_lfht_iter_get_node(&iter.iter); | |
0114db0e | 893 | socket = caa_container_of(node, typeof(*socket), node.node); |
04ed9e10 | 894 | |
28ab034a | 895 | cds_list_for_each_entry (chan, &session->kernel_session->channel_list.head, list) { |
04ed9e10 JG |
896 | int open_ret; |
897 | ||
898 | DBG("Open packet of kernel channel: channel key = %" PRIu64 | |
28ab034a JG |
899 | ", session name = %s, session_id = %" PRIu64, |
900 | chan->key, | |
901 | session->name, | |
902 | session->id); | |
04ed9e10 JG |
903 | |
904 | open_ret = consumer_open_channel_packets(socket, chan->key); | |
905 | if (open_ret < 0) { | |
906 | /* General error (no known error expected). */ | |
907 | ret = LTTNG_ERR_UNK; | |
908 | goto end; | |
909 | } | |
910 | } | |
911 | ||
912 | end: | |
04ed9e10 JG |
913 | return ret; |
914 | } | |
915 | ||
a0a4f314 | 916 | enum lttng_error_code session_open_packets(const ltt_session::locked_ref& session) |
04ed9e10 JG |
917 | { |
918 | enum lttng_error_code ret = LTTNG_OK; | |
919 | ||
920 | DBG("Opening packets of session channels: session name = %s, session id = %" PRIu64, | |
28ab034a JG |
921 | session->name, |
922 | session->id); | |
04ed9e10 JG |
923 | |
924 | if (session->ust_session) { | |
925 | ret = ust_app_open_packets(session); | |
926 | if (ret != LTTNG_OK) { | |
927 | goto end; | |
928 | } | |
929 | } | |
930 | ||
931 | if (session->kernel_session) { | |
932 | ret = session_kernel_open_packets(session); | |
933 | if (ret != LTTNG_OK) { | |
934 | goto end; | |
935 | } | |
936 | } | |
937 | ||
938 | end: | |
939 | return ret; | |
940 | } | |
941 | ||
82b69413 JG |
942 | /* |
943 | * Set a session's current trace chunk. | |
944 | * | |
945 | * Must be called with the session lock held. | |
946 | */ | |
a0a4f314 | 947 | int session_set_trace_chunk(const ltt_session::locked_ref& session, |
28ab034a JG |
948 | struct lttng_trace_chunk *new_trace_chunk, |
949 | struct lttng_trace_chunk **current_trace_chunk) | |
82b69413 | 950 | { |
d9a970b7 | 951 | ASSERT_LOCKED(session->_lock); |
28ab034a JG |
952 | return _session_set_trace_chunk_no_lock_check( |
953 | session, new_trace_chunk, current_trace_chunk); | |
82b69413 JG |
954 | } |
955 | ||
a0a4f314 | 956 | static void session_notify_destruction(const ltt_session::locked_ref& session) |
3e3665b8 JG |
957 | { |
958 | size_t i; | |
a0a4f314 | 959 | const auto count = lttng_dynamic_array_get_count(&session->destroy_notifiers); |
3e3665b8 JG |
960 | |
961 | for (i = 0; i < count; i++) { | |
962 | const struct ltt_session_destroy_notifier_element *element = | |
7966af57 | 963 | (ltt_session_destroy_notifier_element *) lttng_dynamic_array_get_element( |
28ab034a | 964 | &session->destroy_notifiers, i); |
3e3665b8 JG |
965 | |
966 | element->notifier(session, element->user_data); | |
967 | } | |
968 | } | |
969 | ||
ccbdaca4 MD |
970 | /* |
971 | * Fire each clear notifier once, and remove them from the array. | |
972 | */ | |
a0a4f314 | 973 | void session_notify_clear(const ltt_session::locked_ref& session) |
ccbdaca4 MD |
974 | { |
975 | size_t i; | |
a0a4f314 | 976 | const auto count = lttng_dynamic_array_get_count(&session->clear_notifiers); |
ccbdaca4 MD |
977 | |
978 | for (i = 0; i < count; i++) { | |
979 | const struct ltt_session_clear_notifier_element *element = | |
7966af57 | 980 | (ltt_session_clear_notifier_element *) lttng_dynamic_array_get_element( |
a0a4f314 | 981 | &session->clear_notifiers, i); |
ccbdaca4 | 982 | |
a0a4f314 | 983 | element->notifier(session, element->user_data); |
ccbdaca4 | 984 | } |
a0a4f314 | 985 | lttng_dynamic_array_clear(&session->clear_notifiers); |
ccbdaca4 MD |
986 | } |
987 | ||
28ab034a | 988 | static void session_release(struct urcu_ref *ref) |
e32d7f27 JG |
989 | { |
990 | int ret; | |
991 | struct ltt_ust_session *usess; | |
992 | struct ltt_kernel_session *ksess; | |
d9a970b7 | 993 | struct ltt_session *session = lttng::utils::container_of(ref, <t_session::ref_count); |
7fdbed1c | 994 | const bool session_published = session->published; |
e32d7f27 | 995 | |
a0377dfe | 996 | LTTNG_ASSERT(!session->chunk_being_archived); |
d2956687 | 997 | |
e32d7f27 JG |
998 | usess = session->ust_session; |
999 | ksess = session->kernel_session; | |
3e3665b8 | 1000 | |
f8a37411 | 1001 | /* Clean kernel session teardown, keeping data for destroy notifier. */ |
e32d7f27 JG |
1002 | kernel_destroy_session(ksess); |
1003 | ||
d070c424 | 1004 | /* UST session teardown, keeping data for destroy notifier. */ |
e32d7f27 JG |
1005 | if (usess) { |
1006 | /* Close any relayd session */ | |
1007 | consumer_output_send_destroy_relayd(usess->consumer); | |
1008 | ||
1009 | /* Destroy every UST application related to this session. */ | |
1010 | ret = ust_app_destroy_trace_all(usess); | |
1011 | if (ret) { | |
1012 | ERR("Error in ust_app_destroy_trace_all"); | |
1013 | } | |
1014 | ||
d070c424 | 1015 | /* Clean up the rest, keeping destroy notifier data. */ |
e32d7f27 JG |
1016 | trace_ust_destroy_session(usess); |
1017 | } | |
1018 | ||
1019 | /* | |
1020 | * Must notify the kernel thread here to update it's poll set in order to | |
1021 | * remove the channel(s)' fd just destroyed. | |
1022 | */ | |
412d7227 | 1023 | ret = notify_thread_pipe(the_kernel_poll_pipe[1]); |
e32d7f27 JG |
1024 | if (ret < 0) { |
1025 | PERROR("write kernel poll pipe"); | |
1026 | } | |
1027 | ||
1028 | DBG("Destroying session %s (id %" PRIu64 ")", session->name, session->id); | |
e32d7f27 | 1029 | |
e32d7f27 | 1030 | snapshot_destroy(&session->snapshot); |
99d688f2 | 1031 | |
7fdbed1c | 1032 | if (session_published) { |
1a496780 | 1033 | ASSERT_SESSION_LIST_LOCKED(); |
f4cc5e83 JG |
1034 | del_session_list(session); |
1035 | del_session_ht(session); | |
f4cc5e83 | 1036 | } |
a0a4f314 JG |
1037 | |
1038 | /* | |
1039 | * The notifiers make use of free-functions that expect a locked reference to a session. | |
1040 | * To create such a reference, we need to acquire the lock and acquire a reference (increase | |
1041 | * the ref-count). To ensure the release of the reference does not re-cross the zero value, | |
1042 | * set the refcount to a tombstone value. | |
1043 | */ | |
1044 | session->ref_count.refcount = 0xDEAD5E55; | |
1045 | session_notify_destruction([session]() { | |
1046 | session_lock(session); | |
1047 | session_get(session); | |
1048 | return ltt_session::locked_ref(*session); | |
1049 | }()); | |
1050 | ||
1051 | pthread_mutex_destroy(&session->_lock); | |
d070c424 | 1052 | |
1ac9cb73 | 1053 | consumer_output_put(session->consumer); |
d070c424 | 1054 | kernel_free_session(ksess); |
cd9adb8b | 1055 | session->kernel_session = nullptr; |
d070c424 MD |
1056 | if (usess) { |
1057 | trace_ust_free_session(usess); | |
cd9adb8b | 1058 | session->ust_session = nullptr; |
d070c424 | 1059 | } |
7fdbed1c | 1060 | lttng_dynamic_array_reset(&session->destroy_notifiers); |
ccbdaca4 | 1061 | lttng_dynamic_array_reset(&session->clear_notifiers); |
d2956687 | 1062 | free(session->last_archived_chunk_name); |
6fa5fe7c | 1063 | free(session->base_path); |
c08136a3 | 1064 | lttng_trigger_put(session->rotate_trigger); |
e32d7f27 | 1065 | free(session); |
7fdbed1c JG |
1066 | if (session_published) { |
1067 | /* | |
1a496780 JG |
1068 | * Notify after free-ing to ensure the memory is |
1069 | * reclaimed before the main thread exits (and prevent memory leak | |
1070 | * reports). | |
7fdbed1c | 1071 | */ |
1a496780 JG |
1072 | ASSERT_SESSION_LIST_LOCKED(); |
1073 | the_session_list.removal_cond.notify_all(); | |
7fdbed1c | 1074 | } |
e32d7f27 JG |
1075 | } |
1076 | ||
1077 | /* | |
1078 | * Acquire a reference to a session. | |
1079 | * This function may fail (return false); its return value must be checked. | |
1080 | */ | |
1081 | bool session_get(struct ltt_session *session) | |
1082 | { | |
d9a970b7 | 1083 | return urcu_ref_get_unless_zero(&session->ref_count); |
e32d7f27 JG |
1084 | } |
1085 | ||
1086 | /* | |
1087 | * Release a reference to a session. | |
1088 | */ | |
1089 | void session_put(struct ltt_session *session) | |
1090 | { | |
b178f53e JG |
1091 | if (!session) { |
1092 | return; | |
1093 | } | |
e32d7f27 JG |
1094 | /* |
1095 | * The session list lock must be held as any session_put() | |
1096 | * may cause the removal of the session from the session_list. | |
1097 | */ | |
1a496780 | 1098 | ASSERT_SESSION_LIST_LOCKED(); |
d9a970b7 JG |
1099 | LTTNG_ASSERT(session->ref_count.refcount); |
1100 | urcu_ref_put(&session->ref_count, session_release); | |
e32d7f27 JG |
1101 | } |
1102 | ||
1103 | /* | |
1104 | * Destroy a session. | |
1105 | * | |
1106 | * This method does not immediately release/free the session as other | |
1107 | * components may still hold a reference to the session. However, | |
1108 | * the session should no longer be presented to the user. | |
1109 | * | |
1110 | * Releases the session list's reference to the session | |
1111 | * and marks it as destroyed. Iterations on the session list should be | |
1112 | * mindful of the "destroyed" flag. | |
1113 | */ | |
1114 | void session_destroy(struct ltt_session *session) | |
1115 | { | |
ed41e570 JR |
1116 | int ret; |
1117 | struct lttng_ht_iter iter; | |
1118 | ||
a0377dfe | 1119 | LTTNG_ASSERT(!session->destroyed); |
e32d7f27 | 1120 | session->destroyed = true; |
ed41e570 JR |
1121 | |
1122 | /* | |
1123 | * Remove immediately from the "session by name" hash table. Only one | |
1124 | * session is expected to exist with a given name for at any given time. | |
1125 | * | |
1126 | * Even if a session still technically exists for a little while longer, | |
1127 | * there is no point in performing action on a "destroyed" session. | |
1128 | */ | |
1129 | iter.iter.node = &session->node_by_name.node; | |
1130 | ret = lttng_ht_del(ltt_sessions_ht_by_name, &iter); | |
1131 | LTTNG_ASSERT(!ret); | |
1132 | ||
e32d7f27 JG |
1133 | session_put(session); |
1134 | } | |
1135 | ||
a0a4f314 | 1136 | int session_add_destroy_notifier(const ltt_session::locked_ref& session, |
28ab034a JG |
1137 | ltt_session_destroy_notifier notifier, |
1138 | void *user_data) | |
3e3665b8 | 1139 | { |
28ab034a JG |
1140 | const struct ltt_session_destroy_notifier_element element = { .notifier = notifier, |
1141 | .user_data = user_data }; | |
3e3665b8 | 1142 | |
28ab034a | 1143 | return lttng_dynamic_array_add_element(&session->destroy_notifiers, &element); |
3e3665b8 JG |
1144 | } |
1145 | ||
a0a4f314 | 1146 | int session_add_clear_notifier(const ltt_session::locked_ref& session, |
28ab034a JG |
1147 | ltt_session_clear_notifier notifier, |
1148 | void *user_data) | |
ccbdaca4 | 1149 | { |
28ab034a JG |
1150 | const struct ltt_session_clear_notifier_element element = { .notifier = notifier, |
1151 | .user_data = user_data }; | |
ccbdaca4 | 1152 | |
28ab034a | 1153 | return lttng_dynamic_array_add_element(&session->clear_notifiers, &element); |
ccbdaca4 MD |
1154 | } |
1155 | ||
5b74c7b1 | 1156 | /* |
b178f53e JG |
1157 | * Create a new session and add it to the session list. |
1158 | * Session list lock must be held by the caller. | |
5b74c7b1 | 1159 | */ |
28ab034a JG |
1160 | enum lttng_error_code |
1161 | session_create(const char *name, uid_t uid, gid_t gid, struct ltt_session **out_session) | |
5b74c7b1 | 1162 | { |
f3ed775e | 1163 | int ret; |
b178f53e | 1164 | enum lttng_error_code ret_code; |
cd9adb8b | 1165 | struct ltt_session *new_session = nullptr; |
e07ae692 | 1166 | |
1a496780 | 1167 | ASSERT_SESSION_LIST_LOCKED(); |
b178f53e JG |
1168 | if (name) { |
1169 | struct ltt_session *clashing_session; | |
1170 | ||
1171 | clashing_session = session_find_by_name(name); | |
1172 | if (clashing_session) { | |
1173 | session_put(clashing_session); | |
1174 | ret_code = LTTNG_ERR_EXIST_SESS; | |
1175 | goto error; | |
1176 | } | |
1177 | } | |
64803277 | 1178 | new_session = zmalloc<ltt_session>(); |
b178f53e JG |
1179 | if (!new_session) { |
1180 | PERROR("Failed to allocate an ltt_session structure"); | |
1181 | ret_code = LTTNG_ERR_NOMEM; | |
1182 | goto error; | |
5b74c7b1 DG |
1183 | } |
1184 | ||
3e3665b8 | 1185 | lttng_dynamic_array_init(&new_session->destroy_notifiers, |
28ab034a | 1186 | sizeof(struct ltt_session_destroy_notifier_element), |
cd9adb8b | 1187 | nullptr); |
ccbdaca4 | 1188 | lttng_dynamic_array_init(&new_session->clear_notifiers, |
28ab034a | 1189 | sizeof(struct ltt_session_clear_notifier_element), |
cd9adb8b | 1190 | nullptr); |
d9a970b7 JG |
1191 | urcu_ref_init(&new_session->ref_count); |
1192 | pthread_mutex_init(&new_session->_lock, nullptr); | |
e32d7f27 | 1193 | |
cd9adb8b | 1194 | new_session->creation_time = time(nullptr); |
b178f53e JG |
1195 | if (new_session->creation_time == (time_t) -1) { |
1196 | PERROR("Failed to sample session creation time"); | |
1197 | ret_code = LTTNG_ERR_SESSION_FAIL; | |
f3ed775e DG |
1198 | goto error; |
1199 | } | |
1200 | ||
b178f53e JG |
1201 | /* Create default consumer output. */ |
1202 | new_session->consumer = consumer_create_output(CONSUMER_DST_LOCAL); | |
cd9adb8b | 1203 | if (new_session->consumer == nullptr) { |
b178f53e | 1204 | ret_code = LTTNG_ERR_NOMEM; |
1c1c3634 DG |
1205 | goto error; |
1206 | } | |
1207 | ||
b178f53e JG |
1208 | if (name) { |
1209 | ret = lttng_strncpy(new_session->name, name, sizeof(new_session->name)); | |
1210 | if (ret) { | |
1211 | ret_code = LTTNG_ERR_SESSION_INVALID_CHAR; | |
1212 | goto error; | |
1213 | } | |
1214 | ret = validate_name(name); | |
1215 | if (ret < 0) { | |
1216 | ret_code = LTTNG_ERR_SESSION_INVALID_CHAR; | |
1217 | goto error; | |
1218 | } | |
1219 | } else { | |
1220 | int i = 0; | |
1221 | bool found_name = false; | |
1222 | char datetime[16]; | |
1223 | struct tm *timeinfo; | |
1224 | ||
1225 | timeinfo = localtime(&new_session->creation_time); | |
1226 | if (!timeinfo) { | |
1227 | ret_code = LTTNG_ERR_SESSION_FAIL; | |
1228 | goto error; | |
1229 | } | |
1230 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
1231 | for (i = 0; i < INT_MAX; i++) { | |
1232 | struct ltt_session *clashing_session; | |
1233 | ||
1234 | if (i == 0) { | |
1235 | ret = snprintf(new_session->name, | |
28ab034a JG |
1236 | sizeof(new_session->name), |
1237 | "%s-%s", | |
1238 | DEFAULT_SESSION_NAME, | |
1239 | datetime); | |
b178f53e JG |
1240 | } else { |
1241 | ret = snprintf(new_session->name, | |
28ab034a JG |
1242 | sizeof(new_session->name), |
1243 | "%s%d-%s", | |
1244 | DEFAULT_SESSION_NAME, | |
1245 | i, | |
1246 | datetime); | |
b178f53e | 1247 | } |
46ef2188 | 1248 | new_session->name_contains_creation_time = true; |
b178f53e JG |
1249 | if (ret == -1 || ret >= sizeof(new_session->name)) { |
1250 | /* | |
1251 | * Null-terminate in case the name is used | |
1252 | * in logging statements. | |
1253 | */ | |
1254 | new_session->name[sizeof(new_session->name) - 1] = '\0'; | |
1255 | ret_code = LTTNG_ERR_SESSION_FAIL; | |
1256 | goto error; | |
1257 | } | |
1258 | ||
28ab034a | 1259 | clashing_session = session_find_by_name(new_session->name); |
b178f53e JG |
1260 | session_put(clashing_session); |
1261 | if (!clashing_session) { | |
1262 | found_name = true; | |
1263 | break; | |
1264 | } | |
1265 | } | |
1266 | if (found_name) { | |
1267 | DBG("Generated session name \"%s\"", new_session->name); | |
1268 | new_session->has_auto_generated_name = true; | |
1269 | } else { | |
1270 | ERR("Failed to auto-generate a session name"); | |
1271 | ret_code = LTTNG_ERR_SESSION_FAIL; | |
1272 | goto error; | |
1273 | } | |
1274 | } | |
1275 | ||
d3e2ba59 | 1276 | ret = gethostname(new_session->hostname, sizeof(new_session->hostname)); |
73184835 DG |
1277 | if (ret < 0) { |
1278 | if (errno == ENAMETOOLONG) { | |
1279 | new_session->hostname[sizeof(new_session->hostname) - 1] = '\0'; | |
b178f53e | 1280 | ERR("Hostname exceeds the maximal permitted length and has been truncated to %s", |
28ab034a | 1281 | new_session->hostname); |
73184835 | 1282 | } else { |
b178f53e | 1283 | ret_code = LTTNG_ERR_SESSION_FAIL; |
73184835 DG |
1284 | goto error; |
1285 | } | |
d3e2ba59 JD |
1286 | } |
1287 | ||
6df2e2c9 MD |
1288 | new_session->uid = uid; |
1289 | new_session->gid = gid; | |
1290 | ||
6dc3064a DG |
1291 | ret = snapshot_init(&new_session->snapshot); |
1292 | if (ret < 0) { | |
b178f53e | 1293 | ret_code = LTTNG_ERR_NOMEM; |
6dc3064a DG |
1294 | goto error; |
1295 | } | |
1296 | ||
4f23c583 | 1297 | new_session->rotation_state = LTTNG_ROTATION_STATE_NO_ROTATION; |
92816cc3 | 1298 | |
b178f53e | 1299 | /* Add new session to the session list. */ |
a991f516 | 1300 | new_session->id = add_session_list(new_session); |
b178f53e | 1301 | |
23324029 JD |
1302 | /* |
1303 | * Add the new session to the ltt_sessions_ht_by_id. | |
1304 | * No ownership is taken by the hash table; it is merely | |
1305 | * a wrapper around the session list used for faster access | |
1306 | * by session id. | |
1307 | */ | |
1308 | add_session_ht(new_session); | |
f4cc5e83 | 1309 | new_session->published = true; |
b5541356 | 1310 | |
a4b92340 | 1311 | /* |
b178f53e JG |
1312 | * Consumer is left to NULL since the create_session_uri command will |
1313 | * set it up and, if valid, assign it to the session. | |
a4b92340 | 1314 | */ |
b178f53e | 1315 | DBG("Tracing session %s created with ID %" PRIu64 " by uid = %d, gid = %d", |
28ab034a JG |
1316 | new_session->name, |
1317 | new_session->id, | |
1318 | new_session->uid, | |
1319 | new_session->gid); | |
b178f53e JG |
1320 | ret_code = LTTNG_OK; |
1321 | end: | |
1322 | if (new_session) { | |
1323 | (void) session_get(new_session); | |
1324 | *out_session = new_session; | |
1325 | } | |
1326 | return ret_code; | |
5b74c7b1 | 1327 | error: |
f4cc5e83 | 1328 | session_put(new_session); |
cd9adb8b | 1329 | new_session = nullptr; |
b178f53e | 1330 | goto end; |
5b74c7b1 | 1331 | } |
2f77fc4b DG |
1332 | |
1333 | /* | |
d7b377ed | 1334 | * Check if the UID matches the session. Root user has access to all |
2f77fc4b DG |
1335 | * sessions. |
1336 | */ | |
a0a4f314 | 1337 | bool session_access_ok(const ltt_session::locked_ref& session, uid_t uid) |
2f77fc4b | 1338 | { |
d7b377ed | 1339 | return (uid == session->uid) || uid == 0; |
2f77fc4b | 1340 | } |
2961f09e JG |
1341 | |
1342 | /* | |
1343 | * Set a session's rotation state and reset all associated state. | |
1344 | * | |
1345 | * This function resets the rotation state (check timers, pending | |
1346 | * flags, etc.) and sets the result of the last rotation. The result | |
1347 | * can be queries by a liblttng-ctl client. | |
1348 | * | |
1349 | * Be careful of the result passed to this function. For instance, | |
1350 | * on failure to launch a rotation, a client will expect the rotation | |
83ed9e90 | 1351 | * state to be set to "NO_ROTATION". If an error occurred while the |
2961f09e JG |
1352 | * rotation was "ONGOING", result should be set to "ERROR", which will |
1353 | * allow a client to report it. | |
1354 | * | |
1355 | * Must be called with the session and session_list locks held. | |
1356 | */ | |
a0a4f314 JG |
1357 | int session_reset_rotation_state(const ltt_session::locked_ref& session, |
1358 | enum lttng_rotation_state result) | |
2961f09e JG |
1359 | { |
1360 | int ret = 0; | |
1361 | ||
1a496780 | 1362 | ASSERT_SESSION_LIST_LOCKED(); |
2961f09e | 1363 | |
a0a4f314 JG |
1364 | session->rotation_state = result; |
1365 | if (session->rotation_pending_check_timer_enabled) { | |
2961f09e JG |
1366 | ret = timer_session_rotation_pending_check_stop(session); |
1367 | } | |
a0a4f314 | 1368 | if (session->chunk_being_archived) { |
d2956687 JG |
1369 | uint64_t chunk_id; |
1370 | enum lttng_trace_chunk_status chunk_status; | |
1371 | ||
a0a4f314 | 1372 | chunk_status = lttng_trace_chunk_get_id(session->chunk_being_archived, &chunk_id); |
a0377dfe | 1373 | LTTNG_ASSERT(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK); |
a0a4f314 JG |
1374 | LTTNG_OPTIONAL_SET(&session->last_archived_chunk_id, chunk_id); |
1375 | lttng_trace_chunk_put(session->chunk_being_archived); | |
1376 | session->chunk_being_archived = nullptr; | |
ccbdaca4 MD |
1377 | /* |
1378 | * Fire the clear reply notifiers if we are completing a clear | |
1379 | * rotation. | |
1380 | */ | |
1381 | session_notify_clear(session); | |
d2956687 | 1382 | } |
2961f09e JG |
1383 | return ret; |
1384 | } | |
e1bbf989 JR |
1385 | |
1386 | /* | |
1387 | * Sample the id of a session looked up via its name. | |
1388 | * Here the term "sampling" hint the caller that this return the id at a given | |
1389 | * point in time with no guarantee that the session for which the id was | |
1390 | * sampled still exist at that point. | |
1391 | * | |
1392 | * Return 0 when the session is not found, | |
1393 | * Return 1 when the session is found and set `id`. | |
1394 | */ | |
1395 | bool sample_session_id_by_name(const char *name, uint64_t *id) | |
1396 | { | |
1397 | bool found = false; | |
1398 | struct lttng_ht_node_str *node; | |
1399 | struct lttng_ht_iter iter; | |
1400 | struct ltt_session *ls; | |
1401 | ||
56047f5a | 1402 | lttng::urcu::read_lock_guard read_lock; |
e1bbf989 JR |
1403 | |
1404 | if (!ltt_sessions_ht_by_name) { | |
1405 | found = false; | |
1406 | goto end; | |
1407 | } | |
1408 | ||
1409 | lttng_ht_lookup(ltt_sessions_ht_by_name, name, &iter); | |
1410 | node = lttng_ht_iter_get_node_str(&iter); | |
cd9adb8b | 1411 | if (node == nullptr) { |
e1bbf989 JR |
1412 | found = false; |
1413 | goto end; | |
1414 | } | |
1415 | ||
0114db0e | 1416 | ls = lttng::utils::container_of(node, <t_session::node_by_name); |
e1bbf989 JR |
1417 | *id = ls->id; |
1418 | found = true; | |
1419 | ||
1420 | DBG3("Session id `%" PRIu64 "` sampled for session `%s", *id, name); | |
1421 | end: | |
e1bbf989 JR |
1422 | return found; |
1423 | } | |
e99e3664 | 1424 | |
d9a970b7 | 1425 | void ltt_session::_locked_session_release(ltt_session *session) |
e99e3664 | 1426 | { |
0038180d JG |
1427 | if (!session) { |
1428 | return; | |
1429 | } | |
1430 | ||
e99e3664 JG |
1431 | session_unlock(session); |
1432 | session_put(session); | |
1433 | } | |
1434 | ||
d9a970b7 JG |
1435 | void ltt_session::_locked_const_session_release(const ltt_session *session) |
1436 | { | |
1437 | if (!session) { | |
1438 | return; | |
1439 | } | |
1440 | ||
1441 | ltt_session::_const_session_unlock(*session); | |
1442 | ltt_session::_const_session_put(session); | |
1443 | } | |
1444 | ||
1445 | ltt_session::locked_ref ltt_session::find_locked_session(ltt_session::id_t id) | |
e99e3664 JG |
1446 | { |
1447 | lttng::urcu::read_lock_guard rcu_lock; | |
1448 | auto session = session_find_by_id(id); | |
1449 | ||
1450 | if (!session) { | |
d9a970b7 | 1451 | LTTNG_THROW_SESSION_NOT_FOUND_BY_ID_ERROR(id); |
e99e3664 JG |
1452 | } |
1453 | ||
1454 | /* | |
1455 | * The pointer falling out of scope will unlock and release the reference to the | |
1456 | * session. | |
1457 | */ | |
1458 | session_lock(session); | |
a0a4f314 | 1459 | return ltt_session::locked_ref(*session); |
e99e3664 JG |
1460 | } |
1461 | ||
d9a970b7 JG |
1462 | ltt_session::locked_ref ltt_session::find_locked_session(lttng::c_string_view name) |
1463 | { | |
1464 | lttng::urcu::read_lock_guard rcu_lock; | |
1465 | auto session = session_find_by_name(name.data()); | |
1466 | ||
1467 | if (!session) { | |
1468 | LTTNG_THROW_SESSION_NOT_FOUND_BY_NAME_ERROR(name.data()); | |
1469 | } | |
1470 | ||
1471 | session_lock(session); | |
a0a4f314 | 1472 | return ltt_session::locked_ref(*session); |
d9a970b7 JG |
1473 | } |
1474 | ||
1475 | ltt_session::const_locked_ref ltt_session::find_locked_const_session(ltt_session::id_t id) | |
1476 | { | |
1477 | lttng::urcu::read_lock_guard rcu_lock; | |
1478 | auto session = session_find_by_id(id); | |
1479 | ||
1480 | if (!session) { | |
1481 | LTTNG_THROW_SESSION_NOT_FOUND_BY_ID_ERROR(id); | |
1482 | } | |
1483 | ||
1484 | session_lock(session); | |
a0a4f314 | 1485 | return ltt_session::const_locked_ref(*session); |
d9a970b7 JG |
1486 | } |
1487 | ||
1488 | ltt_session::const_locked_ref ltt_session::find_locked_const_session(lttng::c_string_view name) | |
1489 | { | |
1490 | lttng::urcu::read_lock_guard rcu_lock; | |
1491 | auto session = session_find_by_name(name.data()); | |
1492 | ||
1493 | if (!session) { | |
1494 | LTTNG_THROW_SESSION_NOT_FOUND_BY_NAME_ERROR(name.data()); | |
1495 | } | |
1496 | ||
1497 | session_lock(session); | |
a0a4f314 | 1498 | return ltt_session::const_locked_ref(*session); |
d9a970b7 JG |
1499 | } |
1500 | ||
1501 | ltt_session::ref ltt_session::find_session(ltt_session::id_t id) | |
1502 | { | |
1503 | lttng::urcu::read_lock_guard rcu_lock; | |
1504 | auto session = session_find_by_id(id); | |
1505 | ||
1506 | if (!session) { | |
1507 | LTTNG_THROW_SESSION_NOT_FOUND_BY_ID_ERROR(id); | |
1508 | } | |
1509 | ||
a0a4f314 | 1510 | return ltt_session::ref(*session); |
d9a970b7 JG |
1511 | } |
1512 | ||
1513 | ltt_session::ref ltt_session::find_session(lttng::c_string_view name) | |
1514 | { | |
1515 | lttng::urcu::read_lock_guard rcu_lock; | |
1516 | auto session = session_find_by_name(name.data()); | |
1517 | ||
1518 | if (!session) { | |
1519 | LTTNG_THROW_SESSION_NOT_FOUND_BY_NAME_ERROR(name.data()); | |
1520 | } | |
1521 | ||
a0a4f314 | 1522 | return ltt_session::ref(*session); |
d9a970b7 JG |
1523 | } |
1524 | ||
1525 | ltt_session::const_ref ltt_session::find_const_session(ltt_session::id_t id) | |
e99e3664 JG |
1526 | { |
1527 | lttng::urcu::read_lock_guard rcu_lock; | |
1528 | auto session = session_find_by_id(id); | |
1529 | ||
1530 | if (!session) { | |
d9a970b7 JG |
1531 | LTTNG_THROW_SESSION_NOT_FOUND_BY_ID_ERROR(id); |
1532 | } | |
1533 | ||
a0a4f314 | 1534 | return ltt_session::const_ref(*session); |
d9a970b7 JG |
1535 | } |
1536 | ||
1537 | ltt_session::const_ref ltt_session::find_const_session(lttng::c_string_view name) | |
1538 | { | |
1539 | lttng::urcu::read_lock_guard rcu_lock; | |
1540 | auto session = session_find_by_name(name.data()); | |
1541 | ||
1542 | if (!session) { | |
1543 | LTTNG_THROW_SESSION_NOT_FOUND_BY_NAME_ERROR(name.data()); | |
e99e3664 JG |
1544 | } |
1545 | ||
a0a4f314 | 1546 | return ltt_session::const_ref(*session); |
d9a970b7 JG |
1547 | } |
1548 | ||
1549 | void ltt_session::_const_session_put(const ltt_session *session) | |
1550 | { | |
1551 | /* | |
1552 | * The session list lock must be held as any session_put() | |
1553 | * may cause the removal of the session from the session_list. | |
1554 | */ | |
1555 | ASSERT_SESSION_LIST_LOCKED(); | |
1556 | LTTNG_ASSERT(session->ref_count.refcount); | |
1557 | urcu_ref_put(&session->ref_count, session_release); | |
1558 | } | |
1559 | ||
1560 | std::unique_lock<std::mutex> ls::lock_session_list() | |
1561 | { | |
1562 | return std::unique_lock<std::mutex>(the_session_list.lock); | |
e99e3664 | 1563 | } |