Commit | Line | Data |
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ab0ee2ca | 1 | /* |
ab5be9fa | 2 | * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
ab0ee2ca | 3 | * |
ab5be9fa | 4 | * SPDX-License-Identifier: GPL-2.0-only |
ab0ee2ca | 5 | * |
ab0ee2ca JG |
6 | */ |
7 | ||
f2b3ef9f | 8 | #include "lttng/action/action.h" |
c9e313bc | 9 | #include "lttng/trigger/trigger-internal.hpp" |
ab0ee2ca JG |
10 | #define _LGPL_SOURCE |
11 | #include <urcu.h> | |
12 | #include <urcu/rculfhash.h> | |
13 | ||
c9e313bc SM |
14 | #include <common/defaults.hpp> |
15 | #include <common/error.hpp> | |
16 | #include <common/futex.hpp> | |
17 | #include <common/unix.hpp> | |
18 | #include <common/dynamic-buffer.hpp> | |
19 | #include <common/hashtable/utils.hpp> | |
20 | #include <common/sessiond-comm/sessiond-comm.hpp> | |
21 | #include <common/macros.hpp> | |
ab0ee2ca | 22 | #include <lttng/condition/condition.h> |
c9e313bc SM |
23 | #include <lttng/action/action-internal.hpp> |
24 | #include <lttng/action/list-internal.hpp> | |
25 | #include <lttng/domain-internal.hpp> | |
26 | #include <lttng/notification/notification-internal.hpp> | |
27 | #include <lttng/condition/condition-internal.hpp> | |
28 | #include <lttng/condition/buffer-usage-internal.hpp> | |
29 | #include <lttng/condition/session-consumed-size-internal.hpp> | |
30 | #include <lttng/condition/session-rotation-internal.hpp> | |
31 | #include <lttng/condition/event-rule-matches-internal.hpp> | |
32 | #include <lttng/domain-internal.hpp> | |
33 | #include <lttng/notification/channel-internal.hpp> | |
34 | #include <lttng/trigger/trigger-internal.hpp> | |
35 | #include <lttng/event-rule/event-rule-internal.hpp> | |
1da26331 | 36 | |
ab0ee2ca JG |
37 | #include <time.h> |
38 | #include <unistd.h> | |
ab0ee2ca | 39 | #include <inttypes.h> |
d53ea4e4 | 40 | #include <fcntl.h> |
ab0ee2ca | 41 | |
c9e313bc SM |
42 | #include "condition-internal.hpp" |
43 | #include "event-notifier-error-accounting.hpp" | |
44 | #include "notification-thread.hpp" | |
45 | #include "notification-thread-events.hpp" | |
46 | #include "notification-thread-commands.hpp" | |
47 | #include "lttng-sessiond.hpp" | |
48 | #include "kernel.hpp" | |
1da26331 | 49 | |
9016dbfc JG |
50 | #define CLIENT_POLL_EVENTS_IN (LPOLLIN | LPOLLERR | LPOLLHUP | LPOLLRDHUP) |
51 | #define CLIENT_POLL_EVENTS_IN_OUT (CLIENT_POLL_EVENTS_IN | LPOLLOUT) | |
ab0ee2ca | 52 | |
82b3cbf4 JR |
53 | /* The tracers currently limit the capture size to PIPE_BUF (4kb on linux). */ |
54 | #define MAX_CAPTURE_SIZE (PIPE_BUF) | |
55 | ||
51eab943 JG |
56 | enum lttng_object_type { |
57 | LTTNG_OBJECT_TYPE_UNKNOWN, | |
58 | LTTNG_OBJECT_TYPE_NONE, | |
59 | LTTNG_OBJECT_TYPE_CHANNEL, | |
60 | LTTNG_OBJECT_TYPE_SESSION, | |
61 | }; | |
62 | ||
ab0ee2ca JG |
63 | struct lttng_channel_trigger_list { |
64 | struct channel_key channel_key; | |
ea9a44f0 | 65 | /* List of struct lttng_trigger_list_element. */ |
ab0ee2ca | 66 | struct cds_list_head list; |
ea9a44f0 | 67 | /* Node in the channel_triggers_ht */ |
ab0ee2ca | 68 | struct cds_lfht_node channel_triggers_ht_node; |
83b934ad MD |
69 | /* call_rcu delayed reclaim. */ |
70 | struct rcu_head rcu_node; | |
ab0ee2ca JG |
71 | }; |
72 | ||
ea9a44f0 JG |
73 | /* |
74 | * List of triggers applying to a given session. | |
75 | * | |
76 | * See: | |
77 | * - lttng_session_trigger_list_create() | |
78 | * - lttng_session_trigger_list_build() | |
79 | * - lttng_session_trigger_list_destroy() | |
80 | * - lttng_session_trigger_list_add() | |
81 | */ | |
82 | struct lttng_session_trigger_list { | |
83 | /* | |
84 | * Not owned by this; points to the session_info structure's | |
85 | * session name. | |
86 | */ | |
87 | const char *session_name; | |
88 | /* List of struct lttng_trigger_list_element. */ | |
89 | struct cds_list_head list; | |
90 | /* Node in the session_triggers_ht */ | |
91 | struct cds_lfht_node session_triggers_ht_node; | |
92 | /* | |
93 | * Weak reference to the notification system's session triggers | |
94 | * hashtable. | |
95 | * | |
96 | * The session trigger list structure structure is owned by | |
97 | * the session's session_info. | |
98 | * | |
99 | * The session_info is kept alive the the channel_infos holding a | |
100 | * reference to it (reference counting). When those channels are | |
101 | * destroyed (at runtime or on teardown), the reference they hold | |
102 | * to the session_info are released. On destruction of session_info, | |
103 | * session_info_destroy() will remove the list of triggers applying | |
104 | * to this session from the notification system's state. | |
105 | * | |
106 | * This implies that the session_triggers_ht must be destroyed | |
107 | * after the channels. | |
108 | */ | |
109 | struct cds_lfht *session_triggers_ht; | |
110 | /* Used for delayed RCU reclaim. */ | |
111 | struct rcu_head rcu_node; | |
112 | }; | |
113 | ||
f1494934 JG |
114 | namespace { |
115 | struct lttng_trigger_list_element { | |
116 | /* No ownership of the trigger object is assumed. */ | |
117 | struct lttng_trigger *trigger; | |
118 | struct cds_list_head node; | |
119 | }; | |
120 | ||
ab0ee2ca JG |
121 | struct lttng_trigger_ht_element { |
122 | struct lttng_trigger *trigger; | |
123 | struct cds_lfht_node node; | |
242388e4 | 124 | struct cds_lfht_node node_by_name_uid; |
091fa780 | 125 | struct cds_list_head client_list_trigger_node; |
83b934ad MD |
126 | /* call_rcu delayed reclaim. */ |
127 | struct rcu_head rcu_node; | |
ab0ee2ca JG |
128 | }; |
129 | ||
130 | struct lttng_condition_list_element { | |
131 | struct lttng_condition *condition; | |
132 | struct cds_list_head node; | |
133 | }; | |
134 | ||
ab0ee2ca JG |
135 | struct channel_state_sample { |
136 | struct channel_key key; | |
137 | struct cds_lfht_node channel_state_ht_node; | |
138 | uint64_t highest_usage; | |
139 | uint64_t lowest_usage; | |
e8360425 | 140 | uint64_t channel_total_consumed; |
83b934ad MD |
141 | /* call_rcu delayed reclaim. */ |
142 | struct rcu_head rcu_node; | |
ab0ee2ca | 143 | }; |
f1494934 | 144 | } /* namespace */ |
ab0ee2ca | 145 | |
e4db5ace | 146 | static unsigned long hash_channel_key(struct channel_key *key); |
ed327204 | 147 | static int evaluate_buffer_condition(const struct lttng_condition *condition, |
e4db5ace | 148 | struct lttng_evaluation **evaluation, |
e8360425 JD |
149 | const struct notification_thread_state *state, |
150 | const struct channel_state_sample *previous_sample, | |
151 | const struct channel_state_sample *latest_sample, | |
152 | uint64_t previous_session_consumed_total, | |
153 | uint64_t latest_session_consumed_total, | |
154 | struct channel_info *channel_info); | |
e4db5ace | 155 | static |
9b63a4aa JG |
156 | int send_evaluation_to_clients(const struct lttng_trigger *trigger, |
157 | const struct lttng_evaluation *evaluation, | |
e4db5ace JR |
158 | struct notification_client_list *client_list, |
159 | struct notification_thread_state *state, | |
160 | uid_t channel_uid, gid_t channel_gid); | |
161 | ||
8abe313a | 162 | |
ea9a44f0 | 163 | /* session_info API */ |
8abe313a JG |
164 | static |
165 | void session_info_destroy(void *_data); | |
166 | static | |
167 | void session_info_get(struct session_info *session_info); | |
168 | static | |
169 | void session_info_put(struct session_info *session_info); | |
170 | static | |
171 | struct session_info *session_info_create(const char *name, | |
ea9a44f0 | 172 | uid_t uid, gid_t gid, |
1eee26c5 JG |
173 | struct lttng_session_trigger_list *trigger_list, |
174 | struct cds_lfht *sessions_ht); | |
8abe313a JG |
175 | static |
176 | void session_info_add_channel(struct session_info *session_info, | |
177 | struct channel_info *channel_info); | |
178 | static | |
179 | void session_info_remove_channel(struct session_info *session_info, | |
180 | struct channel_info *channel_info); | |
181 | ||
ea9a44f0 JG |
182 | /* lttng_session_trigger_list API */ |
183 | static | |
184 | struct lttng_session_trigger_list *lttng_session_trigger_list_create( | |
185 | const char *session_name, | |
186 | struct cds_lfht *session_triggers_ht); | |
187 | static | |
188 | struct lttng_session_trigger_list *lttng_session_trigger_list_build( | |
189 | const struct notification_thread_state *state, | |
190 | const char *session_name); | |
191 | static | |
192 | void lttng_session_trigger_list_destroy( | |
193 | struct lttng_session_trigger_list *list); | |
194 | static | |
195 | int lttng_session_trigger_list_add(struct lttng_session_trigger_list *list, | |
f2b3ef9f | 196 | struct lttng_trigger *trigger); |
ea9a44f0 | 197 | |
f2b3ef9f JG |
198 | static |
199 | int client_handle_transmission_status( | |
200 | struct notification_client *client, | |
201 | enum client_transmission_status transmission_status, | |
202 | struct notification_thread_state *state); | |
ea9a44f0 | 203 | |
8b524060 FD |
204 | static |
205 | int handle_one_event_notifier_notification( | |
206 | struct notification_thread_state *state, | |
207 | int pipe, enum lttng_domain_type domain); | |
208 | ||
242388e4 JR |
209 | static |
210 | void free_lttng_trigger_ht_element_rcu(struct rcu_head *node); | |
211 | ||
ab0ee2ca | 212 | static |
ac1889bf | 213 | int match_client_socket(struct cds_lfht_node *node, const void *key) |
ab0ee2ca JG |
214 | { |
215 | /* This double-cast is intended to supress pointer-to-cast warning. */ | |
ac1889bf JG |
216 | const int socket = (int) (intptr_t) key; |
217 | const struct notification_client *client = caa_container_of(node, | |
218 | struct notification_client, client_socket_ht_node); | |
ab0ee2ca | 219 | |
ac1889bf JG |
220 | return client->socket == socket; |
221 | } | |
222 | ||
223 | static | |
224 | int match_client_id(struct cds_lfht_node *node, const void *key) | |
225 | { | |
226 | /* This double-cast is intended to supress pointer-to-cast warning. */ | |
227 | const notification_client_id id = *((notification_client_id *) key); | |
0114db0e JG |
228 | const struct notification_client *client = lttng::utils::container_of( |
229 | node, ¬ification_client::client_id_ht_node); | |
ab0ee2ca | 230 | |
ac1889bf | 231 | return client->id == id; |
ab0ee2ca JG |
232 | } |
233 | ||
234 | static | |
235 | int match_channel_trigger_list(struct cds_lfht_node *node, const void *key) | |
236 | { | |
237 | struct channel_key *channel_key = (struct channel_key *) key; | |
238 | struct lttng_channel_trigger_list *trigger_list; | |
239 | ||
240 | trigger_list = caa_container_of(node, struct lttng_channel_trigger_list, | |
241 | channel_triggers_ht_node); | |
242 | ||
243 | return !!((channel_key->key == trigger_list->channel_key.key) && | |
244 | (channel_key->domain == trigger_list->channel_key.domain)); | |
245 | } | |
246 | ||
51eab943 JG |
247 | static |
248 | int match_session_trigger_list(struct cds_lfht_node *node, const void *key) | |
249 | { | |
250 | const char *session_name = (const char *) key; | |
251 | struct lttng_session_trigger_list *trigger_list; | |
252 | ||
253 | trigger_list = caa_container_of(node, struct lttng_session_trigger_list, | |
254 | session_triggers_ht_node); | |
255 | ||
256 | return !!(strcmp(trigger_list->session_name, session_name) == 0); | |
257 | } | |
258 | ||
ab0ee2ca JG |
259 | static |
260 | int match_channel_state_sample(struct cds_lfht_node *node, const void *key) | |
261 | { | |
262 | struct channel_key *channel_key = (struct channel_key *) key; | |
263 | struct channel_state_sample *sample; | |
264 | ||
265 | sample = caa_container_of(node, struct channel_state_sample, | |
266 | channel_state_ht_node); | |
267 | ||
268 | return !!((channel_key->key == sample->key.key) && | |
269 | (channel_key->domain == sample->key.domain)); | |
270 | } | |
271 | ||
272 | static | |
273 | int match_channel_info(struct cds_lfht_node *node, const void *key) | |
274 | { | |
275 | struct channel_key *channel_key = (struct channel_key *) key; | |
276 | struct channel_info *channel_info; | |
277 | ||
278 | channel_info = caa_container_of(node, struct channel_info, | |
279 | channels_ht_node); | |
280 | ||
281 | return !!((channel_key->key == channel_info->key.key) && | |
282 | (channel_key->domain == channel_info->key.domain)); | |
283 | } | |
284 | ||
285 | static | |
242388e4 | 286 | int match_trigger(struct cds_lfht_node *node, const void *key) |
ab0ee2ca | 287 | { |
242388e4 JR |
288 | struct lttng_trigger *trigger_key = (struct lttng_trigger *) key; |
289 | struct lttng_trigger_ht_element *trigger_ht_element; | |
ab0ee2ca | 290 | |
242388e4 | 291 | trigger_ht_element = caa_container_of(node, struct lttng_trigger_ht_element, |
ab0ee2ca | 292 | node); |
ab0ee2ca | 293 | |
242388e4 | 294 | return !!lttng_trigger_is_equal(trigger_key, trigger_ht_element->trigger); |
ab0ee2ca JG |
295 | } |
296 | ||
e7c93cf9 JR |
297 | static |
298 | int match_trigger_token(struct cds_lfht_node *node, const void *key) | |
299 | { | |
7966af57 | 300 | const uint64_t *_key = (uint64_t *) key; |
e7c93cf9 JR |
301 | struct notification_trigger_tokens_ht_element *element; |
302 | ||
303 | element = caa_container_of(node, | |
304 | struct notification_trigger_tokens_ht_element, node); | |
305 | return *_key == element->token; | |
306 | } | |
307 | ||
ab0ee2ca JG |
308 | static |
309 | int match_client_list_condition(struct cds_lfht_node *node, const void *key) | |
310 | { | |
311 | struct lttng_condition *condition_key = (struct lttng_condition *) key; | |
312 | struct notification_client_list *client_list; | |
f82f93a1 | 313 | const struct lttng_condition *condition; |
ab0ee2ca | 314 | |
a0377dfe | 315 | LTTNG_ASSERT(condition_key); |
ab0ee2ca JG |
316 | |
317 | client_list = caa_container_of(node, struct notification_client_list, | |
505b2d90 | 318 | notification_trigger_clients_ht_node); |
091fa780 | 319 | condition = client_list->condition; |
ab0ee2ca JG |
320 | |
321 | return !!lttng_condition_is_equal(condition_key, condition); | |
322 | } | |
323 | ||
f82f93a1 JG |
324 | static |
325 | int match_session(struct cds_lfht_node *node, const void *key) | |
326 | { | |
7966af57 | 327 | const char *name = (const char *) key; |
0114db0e JG |
328 | struct session_info *session_info = lttng::utils::container_of( |
329 | node, &session_info::sessions_ht_node); | |
f82f93a1 JG |
330 | |
331 | return !strcmp(session_info->name, name); | |
332 | } | |
333 | ||
6900ae81 FD |
334 | static |
335 | const char *notification_command_type_str( | |
336 | enum notification_thread_command_type type) | |
337 | { | |
338 | switch (type) { | |
339 | case NOTIFICATION_COMMAND_TYPE_REGISTER_TRIGGER: | |
340 | return "REGISTER_TRIGGER"; | |
341 | case NOTIFICATION_COMMAND_TYPE_UNREGISTER_TRIGGER: | |
342 | return "UNREGISTER_TRIGGER"; | |
343 | case NOTIFICATION_COMMAND_TYPE_ADD_CHANNEL: | |
344 | return "ADD_CHANNEL"; | |
345 | case NOTIFICATION_COMMAND_TYPE_REMOVE_CHANNEL: | |
346 | return "REMOVE_CHANNEL"; | |
347 | case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING: | |
348 | return "SESSION_ROTATION_ONGOING"; | |
349 | case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_COMPLETED: | |
350 | return "SESSION_ROTATION_COMPLETED"; | |
351 | case NOTIFICATION_COMMAND_TYPE_ADD_TRACER_EVENT_SOURCE: | |
352 | return "ADD_TRACER_EVENT_SOURCE"; | |
353 | case NOTIFICATION_COMMAND_TYPE_REMOVE_TRACER_EVENT_SOURCE: | |
354 | return "REMOVE_TRACER_EVENT_SOURCE"; | |
355 | case NOTIFICATION_COMMAND_TYPE_LIST_TRIGGERS: | |
356 | return "LIST_TRIGGERS"; | |
8790759c FD |
357 | case NOTIFICATION_COMMAND_TYPE_GET_TRIGGER: |
358 | return "GET_TRIGGER"; | |
6900ae81 FD |
359 | case NOTIFICATION_COMMAND_TYPE_QUIT: |
360 | return "QUIT"; | |
361 | case NOTIFICATION_COMMAND_TYPE_CLIENT_COMMUNICATION_UPDATE: | |
362 | return "CLIENT_COMMUNICATION_UPDATE"; | |
363 | default: | |
364 | abort(); | |
365 | } | |
366 | } | |
367 | ||
242388e4 JR |
368 | /* |
369 | * Match trigger based on name and credentials only. | |
370 | * Name duplication is NOT allowed for the same uid. | |
371 | */ | |
372 | static | |
373 | int match_trigger_by_name_uid(struct cds_lfht_node *node, | |
374 | const void *key) | |
375 | { | |
376 | bool match = false; | |
0efb2ad7 | 377 | const char *element_trigger_name; |
242388e4 JR |
378 | const char *key_name; |
379 | enum lttng_trigger_status status; | |
380 | const struct lttng_credentials *key_creds; | |
381 | const struct lttng_credentials *node_creds; | |
382 | const struct lttng_trigger *trigger_key = | |
383 | (const struct lttng_trigger *) key; | |
384 | const struct lttng_trigger_ht_element *trigger_ht_element = | |
385 | caa_container_of(node, | |
386 | struct lttng_trigger_ht_element, | |
387 | node_by_name_uid); | |
388 | ||
0efb2ad7 JG |
389 | status = lttng_trigger_get_name(trigger_ht_element->trigger, |
390 | &element_trigger_name); | |
391 | element_trigger_name = status == LTTNG_TRIGGER_STATUS_OK ? | |
392 | element_trigger_name : NULL; | |
242388e4 JR |
393 | |
394 | status = lttng_trigger_get_name(trigger_key, &key_name); | |
0efb2ad7 | 395 | key_name = status == LTTNG_TRIGGER_STATUS_OK ? key_name : NULL; |
242388e4 | 396 | |
0efb2ad7 JG |
397 | /* |
398 | * Compare the names. | |
399 | * Consider null names as not equal. This is to maintain backwards | |
400 | * compatibility with pre-2.13 anonymous triggers. Multiples anonymous | |
401 | * triggers are allowed for a given user. | |
402 | */ | |
403 | if (!element_trigger_name || !key_name) { | |
404 | goto end; | |
405 | } | |
406 | ||
407 | if (strcmp(element_trigger_name, key_name) != 0) { | |
242388e4 JR |
408 | goto end; |
409 | } | |
410 | ||
411 | /* Compare the owners' UIDs. */ | |
412 | key_creds = lttng_trigger_get_credentials(trigger_key); | |
413 | node_creds = lttng_trigger_get_credentials(trigger_ht_element->trigger); | |
414 | ||
415 | match = lttng_credentials_is_equal_uid(key_creds, node_creds); | |
416 | ||
417 | end: | |
418 | return match; | |
419 | } | |
420 | ||
421 | /* | |
422 | * Hash trigger based on name and credentials only. | |
423 | */ | |
424 | static | |
425 | unsigned long hash_trigger_by_name_uid(const struct lttng_trigger *trigger) | |
426 | { | |
427 | unsigned long hash = 0; | |
428 | const struct lttng_credentials *trigger_creds; | |
429 | const char *trigger_name; | |
430 | enum lttng_trigger_status status; | |
431 | ||
432 | status = lttng_trigger_get_name(trigger, &trigger_name); | |
433 | if (status == LTTNG_TRIGGER_STATUS_OK) { | |
434 | hash = hash_key_str(trigger_name, lttng_ht_seed); | |
435 | } | |
436 | ||
437 | trigger_creds = lttng_trigger_get_credentials(trigger); | |
438 | hash ^= hash_key_ulong((void *) (unsigned long) LTTNG_OPTIONAL_GET(trigger_creds->uid), | |
439 | lttng_ht_seed); | |
440 | ||
441 | return hash; | |
442 | } | |
443 | ||
e4db5ace JR |
444 | static |
445 | unsigned long hash_channel_key(struct channel_key *key) | |
446 | { | |
447 | unsigned long key_hash = hash_key_u64(&key->key, lttng_ht_seed); | |
448 | unsigned long domain_hash = hash_key_ulong( | |
449 | (void *) (unsigned long) key->domain, lttng_ht_seed); | |
450 | ||
451 | return key_hash ^ domain_hash; | |
452 | } | |
453 | ||
ac1889bf JG |
454 | static |
455 | unsigned long hash_client_socket(int socket) | |
456 | { | |
457 | return hash_key_ulong((void *) (unsigned long) socket, lttng_ht_seed); | |
458 | } | |
459 | ||
460 | static | |
461 | unsigned long hash_client_id(notification_client_id id) | |
462 | { | |
463 | return hash_key_u64(&id, lttng_ht_seed); | |
464 | } | |
465 | ||
f82f93a1 JG |
466 | /* |
467 | * Get the type of object to which a given condition applies. Bindings let | |
468 | * the notification system evaluate a trigger's condition when a given | |
469 | * object's state is updated. | |
470 | * | |
471 | * For instance, a condition bound to a channel will be evaluated everytime | |
472 | * the channel's state is changed by a channel monitoring sample. | |
473 | */ | |
474 | static | |
475 | enum lttng_object_type get_condition_binding_object( | |
476 | const struct lttng_condition *condition) | |
477 | { | |
478 | switch (lttng_condition_get_type(condition)) { | |
479 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
480 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
481 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
e742b055 | 482 | return LTTNG_OBJECT_TYPE_CHANNEL; |
f82f93a1 JG |
483 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: |
484 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
485 | return LTTNG_OBJECT_TYPE_SESSION; | |
8dbb86b8 | 486 | case LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES: |
959e3c66 | 487 | return LTTNG_OBJECT_TYPE_NONE; |
f82f93a1 JG |
488 | default: |
489 | return LTTNG_OBJECT_TYPE_UNKNOWN; | |
490 | } | |
491 | } | |
492 | ||
83b934ad MD |
493 | static |
494 | void free_channel_info_rcu(struct rcu_head *node) | |
495 | { | |
0114db0e | 496 | free(lttng::utils::container_of(node, &channel_info::rcu_node)); |
83b934ad MD |
497 | } |
498 | ||
ab0ee2ca JG |
499 | static |
500 | void channel_info_destroy(struct channel_info *channel_info) | |
501 | { | |
502 | if (!channel_info) { | |
503 | return; | |
504 | } | |
505 | ||
8abe313a JG |
506 | if (channel_info->session_info) { |
507 | session_info_remove_channel(channel_info->session_info, | |
508 | channel_info); | |
509 | session_info_put(channel_info->session_info); | |
ab0ee2ca | 510 | } |
8abe313a JG |
511 | if (channel_info->name) { |
512 | free(channel_info->name); | |
ab0ee2ca | 513 | } |
83b934ad MD |
514 | call_rcu(&channel_info->rcu_node, free_channel_info_rcu); |
515 | } | |
516 | ||
517 | static | |
518 | void free_session_info_rcu(struct rcu_head *node) | |
519 | { | |
0114db0e | 520 | free(lttng::utils::container_of(node, &session_info::rcu_node)); |
ab0ee2ca JG |
521 | } |
522 | ||
8abe313a | 523 | /* Don't call directly, use the ref-counting mechanism. */ |
ab0ee2ca | 524 | static |
8abe313a | 525 | void session_info_destroy(void *_data) |
ab0ee2ca | 526 | { |
7966af57 | 527 | struct session_info *session_info = (struct session_info *) _data; |
3b68d0a3 | 528 | int ret; |
ab0ee2ca | 529 | |
a0377dfe | 530 | LTTNG_ASSERT(session_info); |
8abe313a | 531 | if (session_info->channel_infos_ht) { |
3b68d0a3 JR |
532 | ret = cds_lfht_destroy(session_info->channel_infos_ht, NULL); |
533 | if (ret) { | |
bd0514a5 | 534 | ERR("Failed to destroy channel information hash table"); |
3b68d0a3 | 535 | } |
8abe313a | 536 | } |
ea9a44f0 | 537 | lttng_session_trigger_list_destroy(session_info->trigger_list); |
1eee26c5 JG |
538 | |
539 | rcu_read_lock(); | |
540 | cds_lfht_del(session_info->sessions_ht, | |
541 | &session_info->sessions_ht_node); | |
542 | rcu_read_unlock(); | |
8abe313a | 543 | free(session_info->name); |
83b934ad | 544 | call_rcu(&session_info->rcu_node, free_session_info_rcu); |
8abe313a | 545 | } |
ab0ee2ca | 546 | |
8abe313a JG |
547 | static |
548 | void session_info_get(struct session_info *session_info) | |
549 | { | |
550 | if (!session_info) { | |
551 | return; | |
552 | } | |
553 | lttng_ref_get(&session_info->ref); | |
554 | } | |
555 | ||
556 | static | |
557 | void session_info_put(struct session_info *session_info) | |
558 | { | |
559 | if (!session_info) { | |
560 | return; | |
ab0ee2ca | 561 | } |
8abe313a JG |
562 | lttng_ref_put(&session_info->ref); |
563 | } | |
564 | ||
565 | static | |
ea9a44f0 | 566 | struct session_info *session_info_create(const char *name, uid_t uid, gid_t gid, |
1eee26c5 JG |
567 | struct lttng_session_trigger_list *trigger_list, |
568 | struct cds_lfht *sessions_ht) | |
8abe313a JG |
569 | { |
570 | struct session_info *session_info; | |
ab0ee2ca | 571 | |
a0377dfe | 572 | LTTNG_ASSERT(name); |
ab0ee2ca | 573 | |
64803277 | 574 | session_info = zmalloc<struct session_info>(); |
8abe313a JG |
575 | if (!session_info) { |
576 | goto end; | |
577 | } | |
578 | lttng_ref_init(&session_info->ref, session_info_destroy); | |
579 | ||
580 | session_info->channel_infos_ht = cds_lfht_new(DEFAULT_HT_SIZE, | |
581 | 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
582 | if (!session_info->channel_infos_ht) { | |
ab0ee2ca JG |
583 | goto error; |
584 | } | |
8abe313a JG |
585 | |
586 | cds_lfht_node_init(&session_info->sessions_ht_node); | |
587 | session_info->name = strdup(name); | |
588 | if (!session_info->name) { | |
ab0ee2ca JG |
589 | goto error; |
590 | } | |
8abe313a JG |
591 | session_info->uid = uid; |
592 | session_info->gid = gid; | |
ea9a44f0 | 593 | session_info->trigger_list = trigger_list; |
1eee26c5 | 594 | session_info->sessions_ht = sessions_ht; |
8abe313a JG |
595 | end: |
596 | return session_info; | |
597 | error: | |
598 | session_info_put(session_info); | |
599 | return NULL; | |
600 | } | |
601 | ||
602 | static | |
603 | void session_info_add_channel(struct session_info *session_info, | |
604 | struct channel_info *channel_info) | |
605 | { | |
606 | rcu_read_lock(); | |
607 | cds_lfht_add(session_info->channel_infos_ht, | |
608 | hash_channel_key(&channel_info->key), | |
609 | &channel_info->session_info_channels_ht_node); | |
610 | rcu_read_unlock(); | |
611 | } | |
612 | ||
613 | static | |
614 | void session_info_remove_channel(struct session_info *session_info, | |
615 | struct channel_info *channel_info) | |
616 | { | |
617 | rcu_read_lock(); | |
618 | cds_lfht_del(session_info->channel_infos_ht, | |
619 | &channel_info->session_info_channels_ht_node); | |
620 | rcu_read_unlock(); | |
621 | } | |
622 | ||
623 | static | |
624 | struct channel_info *channel_info_create(const char *channel_name, | |
625 | struct channel_key *channel_key, uint64_t channel_capacity, | |
626 | struct session_info *session_info) | |
627 | { | |
64803277 | 628 | struct channel_info *channel_info = zmalloc<struct channel_info>(); |
8abe313a JG |
629 | |
630 | if (!channel_info) { | |
631 | goto end; | |
632 | } | |
633 | ||
ab0ee2ca | 634 | cds_lfht_node_init(&channel_info->channels_ht_node); |
8abe313a JG |
635 | cds_lfht_node_init(&channel_info->session_info_channels_ht_node); |
636 | memcpy(&channel_info->key, channel_key, sizeof(*channel_key)); | |
637 | channel_info->capacity = channel_capacity; | |
638 | ||
639 | channel_info->name = strdup(channel_name); | |
640 | if (!channel_info->name) { | |
641 | goto error; | |
642 | } | |
643 | ||
644 | /* | |
645 | * Set the references between session and channel infos: | |
646 | * - channel_info holds a strong reference to session_info | |
647 | * - session_info holds a weak reference to channel_info | |
648 | */ | |
649 | session_info_get(session_info); | |
650 | session_info_add_channel(session_info, channel_info); | |
651 | channel_info->session_info = session_info; | |
ab0ee2ca | 652 | end: |
8abe313a | 653 | return channel_info; |
ab0ee2ca | 654 | error: |
8abe313a | 655 | channel_info_destroy(channel_info); |
ab0ee2ca JG |
656 | return NULL; |
657 | } | |
658 | ||
505b2d90 JG |
659 | bool notification_client_list_get(struct notification_client_list *list) |
660 | { | |
661 | return urcu_ref_get_unless_zero(&list->ref); | |
662 | } | |
663 | ||
664 | static | |
665 | void free_notification_client_list_rcu(struct rcu_head *node) | |
666 | { | |
667 | free(caa_container_of(node, struct notification_client_list, | |
668 | rcu_node)); | |
669 | } | |
670 | ||
671 | static | |
672 | void notification_client_list_release(struct urcu_ref *list_ref) | |
673 | { | |
674 | struct notification_client_list *list = | |
0114db0e | 675 | lttng::utils::container_of(list_ref, ¬ification_client_list::ref); |
505b2d90 JG |
676 | struct notification_client_list_element *client_list_element, *tmp; |
677 | ||
091fa780 FD |
678 | lttng_condition_put(list->condition); |
679 | ||
505b2d90 JG |
680 | if (list->notification_trigger_clients_ht) { |
681 | rcu_read_lock(); | |
091fa780 | 682 | |
505b2d90 JG |
683 | cds_lfht_del(list->notification_trigger_clients_ht, |
684 | &list->notification_trigger_clients_ht_node); | |
685 | rcu_read_unlock(); | |
686 | list->notification_trigger_clients_ht = NULL; | |
687 | } | |
688 | cds_list_for_each_entry_safe(client_list_element, tmp, | |
091fa780 | 689 | &list->clients_list, node) { |
505b2d90 JG |
690 | free(client_list_element); |
691 | } | |
091fa780 | 692 | |
a0377dfe | 693 | LTTNG_ASSERT(cds_list_empty(&list->triggers_list)); |
091fa780 | 694 | |
505b2d90 JG |
695 | pthread_mutex_destroy(&list->lock); |
696 | call_rcu(&list->rcu_node, free_notification_client_list_rcu); | |
697 | } | |
698 | ||
091fa780 FD |
699 | static |
700 | bool condition_applies_to_client(const struct lttng_condition *condition, | |
701 | struct notification_client *client) | |
702 | { | |
703 | bool applies = false; | |
704 | struct lttng_condition_list_element *condition_list_element; | |
705 | ||
706 | cds_list_for_each_entry(condition_list_element, &client->condition_list, | |
707 | node) { | |
708 | applies = lttng_condition_is_equal( | |
709 | condition_list_element->condition, | |
710 | condition); | |
711 | if (applies) { | |
712 | break; | |
713 | } | |
714 | } | |
715 | ||
716 | return applies; | |
717 | } | |
718 | ||
505b2d90 JG |
719 | static |
720 | struct notification_client_list *notification_client_list_create( | |
091fa780 FD |
721 | struct notification_thread_state *state, |
722 | const struct lttng_condition *condition) | |
505b2d90 | 723 | { |
091fa780 FD |
724 | struct notification_client *client; |
725 | struct cds_lfht_iter iter; | |
726 | struct notification_client_list *client_list; | |
505b2d90 | 727 | |
64803277 | 728 | client_list = zmalloc<notification_client_list>(); |
505b2d90 | 729 | if (!client_list) { |
091fa780 FD |
730 | PERROR("Failed to allocate notification client list"); |
731 | goto end; | |
505b2d90 | 732 | } |
091fa780 | 733 | |
505b2d90 | 734 | pthread_mutex_init(&client_list->lock, NULL); |
091fa780 FD |
735 | /* |
736 | * The trigger that owns the condition has the first reference to this | |
737 | * client list. | |
738 | */ | |
505b2d90 JG |
739 | urcu_ref_init(&client_list->ref); |
740 | cds_lfht_node_init(&client_list->notification_trigger_clients_ht_node); | |
091fa780 FD |
741 | CDS_INIT_LIST_HEAD(&client_list->clients_list); |
742 | CDS_INIT_LIST_HEAD(&client_list->triggers_list); | |
505b2d90 | 743 | |
091fa780 FD |
744 | /* |
745 | * Create a copy of the condition so that it's independent of any | |
746 | * trigger. The client list may outlive the trigger object (which owns | |
747 | * the condition) that is used to create it. | |
748 | */ | |
749 | client_list->condition = lttng_condition_copy(condition); | |
750 | ||
751 | /* Build a list of clients to which this new condition applies. */ | |
752 | cds_lfht_for_each_entry (state->client_socket_ht, &iter, client, | |
753 | client_socket_ht_node) { | |
754 | struct notification_client_list_element *client_list_element; | |
505b2d90 | 755 | |
091fa780 FD |
756 | if (!condition_applies_to_client(condition, client)) { |
757 | continue; | |
758 | } | |
759 | ||
64803277 | 760 | client_list_element = zmalloc<notification_client_list_element>(); |
091fa780 FD |
761 | if (!client_list_element) { |
762 | goto error_put_client_list; | |
763 | } | |
505b2d90 | 764 | |
091fa780 FD |
765 | CDS_INIT_LIST_HEAD(&client_list_element->node); |
766 | client_list_element->client = client; | |
767 | cds_list_add(&client_list_element->node, &client_list->clients_list); | |
768 | } | |
769 | ||
770 | client_list->notification_trigger_clients_ht = | |
505b2d90 JG |
771 | state->notification_trigger_clients_ht; |
772 | ||
773 | rcu_read_lock(); | |
091fa780 FD |
774 | /* |
775 | * Add the client list to the global list of client list. | |
776 | */ | |
777 | cds_lfht_add_unique(state->notification_trigger_clients_ht, | |
778 | lttng_condition_hash(client_list->condition), | |
779 | match_client_list_condition, | |
780 | client_list->condition, | |
781 | &client_list->notification_trigger_clients_ht_node); | |
505b2d90 | 782 | rcu_read_unlock(); |
091fa780 FD |
783 | goto end; |
784 | ||
785 | error_put_client_list: | |
786 | notification_client_list_put(client_list); | |
787 | client_list = NULL; | |
788 | ||
789 | end: | |
790 | return client_list; | |
505b2d90 JG |
791 | } |
792 | ||
505b2d90 JG |
793 | void notification_client_list_put(struct notification_client_list *list) |
794 | { | |
795 | if (!list) { | |
796 | return; | |
797 | } | |
798 | return urcu_ref_put(&list->ref, notification_client_list_release); | |
799 | } | |
800 | ||
801 | /* Provides a reference to the returned list. */ | |
ed327204 JG |
802 | static |
803 | struct notification_client_list *get_client_list_from_condition( | |
804 | struct notification_thread_state *state, | |
805 | const struct lttng_condition *condition) | |
806 | { | |
807 | struct cds_lfht_node *node; | |
808 | struct cds_lfht_iter iter; | |
505b2d90 | 809 | struct notification_client_list *list = NULL; |
ed327204 | 810 | |
505b2d90 | 811 | rcu_read_lock(); |
ed327204 JG |
812 | cds_lfht_lookup(state->notification_trigger_clients_ht, |
813 | lttng_condition_hash(condition), | |
814 | match_client_list_condition, | |
815 | condition, | |
816 | &iter); | |
817 | node = cds_lfht_iter_get_node(&iter); | |
505b2d90 | 818 | if (node) { |
0114db0e JG |
819 | list = lttng::utils::container_of(node, |
820 | ¬ification_client_list::notification_trigger_clients_ht_node); | |
505b2d90 JG |
821 | list = notification_client_list_get(list) ? list : NULL; |
822 | } | |
ed327204 | 823 | |
505b2d90 JG |
824 | rcu_read_unlock(); |
825 | return list; | |
ed327204 JG |
826 | } |
827 | ||
e4db5ace | 828 | static |
f82f93a1 JG |
829 | int evaluate_channel_condition_for_client( |
830 | const struct lttng_condition *condition, | |
831 | struct notification_thread_state *state, | |
832 | struct lttng_evaluation **evaluation, | |
833 | uid_t *session_uid, gid_t *session_gid) | |
e4db5ace JR |
834 | { |
835 | int ret; | |
836 | struct cds_lfht_iter iter; | |
837 | struct cds_lfht_node *node; | |
838 | struct channel_info *channel_info = NULL; | |
839 | struct channel_key *channel_key = NULL; | |
840 | struct channel_state_sample *last_sample = NULL; | |
841 | struct lttng_channel_trigger_list *channel_trigger_list = NULL; | |
e4db5ace | 842 | |
505b2d90 JG |
843 | rcu_read_lock(); |
844 | ||
f82f93a1 | 845 | /* Find the channel associated with the condition. */ |
e4db5ace | 846 | cds_lfht_for_each_entry(state->channel_triggers_ht, &iter, |
f82f93a1 | 847 | channel_trigger_list, channel_triggers_ht_node) { |
e4db5ace JR |
848 | struct lttng_trigger_list_element *element; |
849 | ||
850 | cds_list_for_each_entry(element, &channel_trigger_list->list, node) { | |
9b63a4aa | 851 | const struct lttng_condition *current_condition = |
f82f93a1 | 852 | lttng_trigger_get_const_condition( |
e4db5ace JR |
853 | element->trigger); |
854 | ||
a0377dfe | 855 | LTTNG_ASSERT(current_condition); |
e4db5ace | 856 | if (!lttng_condition_is_equal(condition, |
2ae99f0b | 857 | current_condition)) { |
e4db5ace JR |
858 | continue; |
859 | } | |
860 | ||
861 | /* Found the trigger, save the channel key. */ | |
862 | channel_key = &channel_trigger_list->channel_key; | |
863 | break; | |
864 | } | |
865 | if (channel_key) { | |
866 | /* The channel key was found stop iteration. */ | |
867 | break; | |
868 | } | |
869 | } | |
870 | ||
871 | if (!channel_key){ | |
872 | /* No channel found; normal exit. */ | |
bd0514a5 | 873 | DBG("No known channel associated with newly subscribed-to condition"); |
e4db5ace JR |
874 | ret = 0; |
875 | goto end; | |
876 | } | |
877 | ||
878 | /* Fetch channel info for the matching channel. */ | |
879 | cds_lfht_lookup(state->channels_ht, | |
880 | hash_channel_key(channel_key), | |
881 | match_channel_info, | |
882 | channel_key, | |
883 | &iter); | |
884 | node = cds_lfht_iter_get_node(&iter); | |
a0377dfe | 885 | LTTNG_ASSERT(node); |
e4db5ace JR |
886 | channel_info = caa_container_of(node, struct channel_info, |
887 | channels_ht_node); | |
888 | ||
889 | /* Retrieve the channel's last sample, if it exists. */ | |
890 | cds_lfht_lookup(state->channel_state_ht, | |
891 | hash_channel_key(channel_key), | |
892 | match_channel_state_sample, | |
893 | channel_key, | |
894 | &iter); | |
895 | node = cds_lfht_iter_get_node(&iter); | |
896 | if (node) { | |
897 | last_sample = caa_container_of(node, | |
898 | struct channel_state_sample, | |
899 | channel_state_ht_node); | |
900 | } else { | |
901 | /* Nothing to evaluate, no sample was ever taken. Normal exit */ | |
bd0514a5 | 902 | DBG("No channel sample associated with newly subscribed-to condition"); |
e4db5ace JR |
903 | ret = 0; |
904 | goto end; | |
905 | } | |
906 | ||
f82f93a1 | 907 | ret = evaluate_buffer_condition(condition, evaluation, state, |
e8360425 JD |
908 | NULL, last_sample, |
909 | 0, channel_info->session_info->consumed_data_size, | |
910 | channel_info); | |
e4db5ace | 911 | if (ret) { |
bd0514a5 | 912 | WARN("Fatal error occurred while evaluating a newly subscribed-to condition"); |
e4db5ace JR |
913 | goto end; |
914 | } | |
915 | ||
f82f93a1 JG |
916 | *session_uid = channel_info->session_info->uid; |
917 | *session_gid = channel_info->session_info->gid; | |
918 | end: | |
505b2d90 | 919 | rcu_read_unlock(); |
f82f93a1 JG |
920 | return ret; |
921 | } | |
922 | ||
923 | static | |
924 | const char *get_condition_session_name(const struct lttng_condition *condition) | |
925 | { | |
926 | const char *session_name = NULL; | |
927 | enum lttng_condition_status status; | |
928 | ||
929 | switch (lttng_condition_get_type(condition)) { | |
930 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
931 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
932 | status = lttng_condition_buffer_usage_get_session_name( | |
933 | condition, &session_name); | |
934 | break; | |
935 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
936 | status = lttng_condition_session_consumed_size_get_session_name( | |
937 | condition, &session_name); | |
938 | break; | |
939 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
940 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
941 | status = lttng_condition_session_rotation_get_session_name( | |
942 | condition, &session_name); | |
943 | break; | |
944 | default: | |
945 | abort(); | |
946 | } | |
947 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
bd0514a5 | 948 | ERR("Failed to retrieve session rotation condition's session name"); |
f82f93a1 JG |
949 | goto end; |
950 | } | |
951 | end: | |
952 | return session_name; | |
953 | } | |
954 | ||
f82f93a1 JG |
955 | static |
956 | int evaluate_session_condition_for_client( | |
957 | const struct lttng_condition *condition, | |
958 | struct notification_thread_state *state, | |
959 | struct lttng_evaluation **evaluation, | |
960 | uid_t *session_uid, gid_t *session_gid) | |
961 | { | |
962 | int ret; | |
963 | struct cds_lfht_iter iter; | |
964 | struct cds_lfht_node *node; | |
965 | const char *session_name; | |
966 | struct session_info *session_info = NULL; | |
967 | ||
505b2d90 | 968 | rcu_read_lock(); |
f82f93a1 JG |
969 | session_name = get_condition_session_name(condition); |
970 | ||
971 | /* Find the session associated with the trigger. */ | |
972 | cds_lfht_lookup(state->sessions_ht, | |
973 | hash_key_str(session_name, lttng_ht_seed), | |
974 | match_session, | |
975 | session_name, | |
976 | &iter); | |
977 | node = cds_lfht_iter_get_node(&iter); | |
978 | if (!node) { | |
bd0514a5 | 979 | DBG("No known session matching name \"%s\"", |
f82f93a1 JG |
980 | session_name); |
981 | ret = 0; | |
982 | goto end; | |
983 | } | |
984 | ||
985 | session_info = caa_container_of(node, struct session_info, | |
986 | sessions_ht_node); | |
987 | session_info_get(session_info); | |
988 | ||
989 | /* | |
990 | * Evaluation is performed in-line here since only one type of | |
991 | * session-bound condition is handled for the moment. | |
992 | */ | |
993 | switch (lttng_condition_get_type(condition)) { | |
994 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
995 | if (!session_info->rotation.ongoing) { | |
be558f88 | 996 | ret = 0; |
f82f93a1 JG |
997 | goto end_session_put; |
998 | } | |
999 | ||
1000 | *evaluation = lttng_evaluation_session_rotation_ongoing_create( | |
1001 | session_info->rotation.id); | |
1002 | if (!*evaluation) { | |
1003 | /* Fatal error. */ | |
bd0514a5 | 1004 | ERR("Failed to create session rotation ongoing evaluation for session \"%s\"", |
f82f93a1 JG |
1005 | session_info->name); |
1006 | ret = -1; | |
1007 | goto end_session_put; | |
1008 | } | |
1009 | ret = 0; | |
1010 | break; | |
1011 | default: | |
1012 | ret = 0; | |
1013 | goto end_session_put; | |
1014 | } | |
1015 | ||
1016 | *session_uid = session_info->uid; | |
1017 | *session_gid = session_info->gid; | |
1018 | ||
1019 | end_session_put: | |
1020 | session_info_put(session_info); | |
1021 | end: | |
505b2d90 | 1022 | rcu_read_unlock(); |
f82f93a1 JG |
1023 | return ret; |
1024 | } | |
1025 | ||
f82f93a1 JG |
1026 | static |
1027 | int evaluate_condition_for_client(const struct lttng_trigger *trigger, | |
1028 | const struct lttng_condition *condition, | |
1029 | struct notification_client *client, | |
1030 | struct notification_thread_state *state) | |
1031 | { | |
1032 | int ret; | |
1033 | struct lttng_evaluation *evaluation = NULL; | |
505b2d90 JG |
1034 | struct notification_client_list client_list = { |
1035 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
1c9a0b0e MJ |
1036 | .ref = {}, |
1037 | .condition = NULL, | |
1038 | .triggers_list = {}, | |
1039 | .clients_list = {}, | |
1040 | .notification_trigger_clients_ht = NULL, | |
1041 | .notification_trigger_clients_ht_node = {}, | |
1042 | .rcu_node = {}, | |
505b2d90 | 1043 | }; |
1c9a0b0e | 1044 | struct notification_client_list_element client_list_element = {}; |
f82f93a1 JG |
1045 | uid_t object_uid = 0; |
1046 | gid_t object_gid = 0; | |
1047 | ||
a0377dfe FD |
1048 | LTTNG_ASSERT(trigger); |
1049 | LTTNG_ASSERT(condition); | |
1050 | LTTNG_ASSERT(client); | |
1051 | LTTNG_ASSERT(state); | |
f82f93a1 JG |
1052 | |
1053 | switch (get_condition_binding_object(condition)) { | |
1054 | case LTTNG_OBJECT_TYPE_SESSION: | |
1055 | ret = evaluate_session_condition_for_client(condition, state, | |
1056 | &evaluation, &object_uid, &object_gid); | |
1057 | break; | |
1058 | case LTTNG_OBJECT_TYPE_CHANNEL: | |
1059 | ret = evaluate_channel_condition_for_client(condition, state, | |
1060 | &evaluation, &object_uid, &object_gid); | |
1061 | break; | |
1062 | case LTTNG_OBJECT_TYPE_NONE: | |
bd0514a5 | 1063 | DBG("Newly subscribed-to condition not bound to object, nothing to evaluate"); |
f82f93a1 JG |
1064 | ret = 0; |
1065 | goto end; | |
1066 | case LTTNG_OBJECT_TYPE_UNKNOWN: | |
1067 | default: | |
1068 | ret = -1; | |
1069 | goto end; | |
1070 | } | |
af0c318d JG |
1071 | if (ret) { |
1072 | /* Fatal error. */ | |
1073 | goto end; | |
1074 | } | |
e4db5ace JR |
1075 | if (!evaluation) { |
1076 | /* Evaluation yielded nothing. Normal exit. */ | |
bd0514a5 | 1077 | DBG("Newly subscribed-to condition evaluated to false, nothing to report to client"); |
e4db5ace JR |
1078 | ret = 0; |
1079 | goto end; | |
1080 | } | |
1081 | ||
1082 | /* | |
1083 | * Create a temporary client list with the client currently | |
1084 | * subscribing. | |
1085 | */ | |
505b2d90 | 1086 | cds_lfht_node_init(&client_list.notification_trigger_clients_ht_node); |
091fa780 | 1087 | CDS_INIT_LIST_HEAD(&client_list.clients_list); |
e4db5ace JR |
1088 | |
1089 | CDS_INIT_LIST_HEAD(&client_list_element.node); | |
1090 | client_list_element.client = client; | |
091fa780 | 1091 | cds_list_add(&client_list_element.node, &client_list.clients_list); |
e4db5ace JR |
1092 | |
1093 | /* Send evaluation result to the newly-subscribed client. */ | |
bd0514a5 | 1094 | DBG("Newly subscribed-to condition evaluated to true, notifying client"); |
e4db5ace | 1095 | ret = send_evaluation_to_clients(trigger, evaluation, &client_list, |
f82f93a1 | 1096 | state, object_uid, object_gid); |
e4db5ace JR |
1097 | |
1098 | end: | |
1099 | return ret; | |
1100 | } | |
1101 | ||
ab0ee2ca JG |
1102 | static |
1103 | int notification_thread_client_subscribe(struct notification_client *client, | |
1104 | struct lttng_condition *condition, | |
1105 | struct notification_thread_state *state, | |
1106 | enum lttng_notification_channel_status *_status) | |
1107 | { | |
1108 | int ret = 0; | |
505b2d90 | 1109 | struct notification_client_list *client_list = NULL; |
ab0ee2ca JG |
1110 | struct lttng_condition_list_element *condition_list_element = NULL; |
1111 | struct notification_client_list_element *client_list_element = NULL; | |
a3ed2a4e | 1112 | struct lttng_trigger_ht_element *trigger_ht_element; |
ab0ee2ca JG |
1113 | enum lttng_notification_channel_status status = |
1114 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
1115 | ||
1116 | /* | |
1117 | * Ensure that the client has not already subscribed to this condition | |
1118 | * before. | |
1119 | */ | |
1120 | cds_list_for_each_entry(condition_list_element, &client->condition_list, node) { | |
1121 | if (lttng_condition_is_equal(condition_list_element->condition, | |
1122 | condition)) { | |
1123 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_ALREADY_SUBSCRIBED; | |
1124 | goto end; | |
1125 | } | |
1126 | } | |
1127 | ||
64803277 | 1128 | condition_list_element = zmalloc<lttng_condition_list_element>(); |
ab0ee2ca JG |
1129 | if (!condition_list_element) { |
1130 | ret = -1; | |
1131 | goto error; | |
1132 | } | |
64803277 | 1133 | client_list_element = zmalloc<notification_client_list_element>(); |
ab0ee2ca JG |
1134 | if (!client_list_element) { |
1135 | ret = -1; | |
1136 | goto error; | |
1137 | } | |
1138 | ||
ab0ee2ca JG |
1139 | /* |
1140 | * Add the newly-subscribed condition to the client's subscription list. | |
1141 | */ | |
1142 | CDS_INIT_LIST_HEAD(&condition_list_element->node); | |
1143 | condition_list_element->condition = condition; | |
5a6306f7 | 1144 | condition = NULL; |
ab0ee2ca JG |
1145 | cds_list_add(&condition_list_element->node, &client->condition_list); |
1146 | ||
5a6306f7 JG |
1147 | client_list = get_client_list_from_condition( |
1148 | state, condition_list_element->condition); | |
ed327204 | 1149 | if (!client_list) { |
2ae99f0b JG |
1150 | /* |
1151 | * No notification-emiting trigger registered with this | |
1152 | * condition. We don't evaluate the condition right away | |
1153 | * since this trigger is not registered yet. | |
1154 | */ | |
4fb43b68 | 1155 | free(client_list_element); |
505b2d90 | 1156 | goto end; |
ab0ee2ca JG |
1157 | } |
1158 | ||
2ae99f0b JG |
1159 | /* |
1160 | * The condition to which the client just subscribed is evaluated | |
1161 | * at this point so that conditions that are already TRUE result | |
1162 | * in a notification being sent out. | |
505b2d90 | 1163 | * |
57644a7f JG |
1164 | * Note the iteration on all triggers which share an identical |
1165 | * `condition` than the one to which the client is registering. This is | |
1166 | * done to ensure that the client receives a distinct notification for | |
1167 | * all triggers that have a `notify` action that have this condition. | |
2ae99f0b | 1168 | */ |
091fa780 FD |
1169 | pthread_mutex_lock(&client_list->lock); |
1170 | cds_list_for_each_entry(trigger_ht_element, | |
1171 | &client_list->triggers_list, client_list_trigger_node) { | |
5a6306f7 | 1172 | if (evaluate_condition_for_client(trigger_ht_element->trigger, condition_list_element->condition, |
091fa780 | 1173 | client, state)) { |
bd0514a5 | 1174 | WARN("Evaluation of a condition on client subscription failed, aborting."); |
091fa780 FD |
1175 | ret = -1; |
1176 | free(client_list_element); | |
ecc7ed07 | 1177 | pthread_mutex_unlock(&client_list->lock); |
091fa780 FD |
1178 | goto end; |
1179 | } | |
e4db5ace | 1180 | } |
091fa780 | 1181 | pthread_mutex_unlock(&client_list->lock); |
e4db5ace JR |
1182 | |
1183 | /* | |
1184 | * Add the client to the list of clients interested in a given trigger | |
1185 | * if a "notification" trigger with a corresponding condition was | |
1186 | * added prior. | |
1187 | */ | |
ab0ee2ca JG |
1188 | client_list_element->client = client; |
1189 | CDS_INIT_LIST_HEAD(&client_list_element->node); | |
505b2d90 JG |
1190 | |
1191 | pthread_mutex_lock(&client_list->lock); | |
091fa780 | 1192 | cds_list_add(&client_list_element->node, &client_list->clients_list); |
505b2d90 | 1193 | pthread_mutex_unlock(&client_list->lock); |
ab0ee2ca JG |
1194 | end: |
1195 | if (_status) { | |
1196 | *_status = status; | |
1197 | } | |
505b2d90 JG |
1198 | if (client_list) { |
1199 | notification_client_list_put(client_list); | |
1200 | } | |
5a6306f7 | 1201 | lttng_condition_destroy(condition); |
ab0ee2ca JG |
1202 | return ret; |
1203 | error: | |
1204 | free(condition_list_element); | |
1205 | free(client_list_element); | |
5a6306f7 | 1206 | lttng_condition_destroy(condition); |
ab0ee2ca JG |
1207 | return ret; |
1208 | } | |
1209 | ||
1210 | static | |
1211 | int notification_thread_client_unsubscribe( | |
1212 | struct notification_client *client, | |
1213 | struct lttng_condition *condition, | |
1214 | struct notification_thread_state *state, | |
1215 | enum lttng_notification_channel_status *_status) | |
1216 | { | |
ab0ee2ca JG |
1217 | struct notification_client_list *client_list; |
1218 | struct lttng_condition_list_element *condition_list_element, | |
1219 | *condition_tmp; | |
1220 | struct notification_client_list_element *client_list_element, | |
1221 | *client_tmp; | |
1222 | bool condition_found = false; | |
1223 | enum lttng_notification_channel_status status = | |
1224 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
1225 | ||
1226 | /* Remove the condition from the client's condition list. */ | |
1227 | cds_list_for_each_entry_safe(condition_list_element, condition_tmp, | |
1228 | &client->condition_list, node) { | |
1229 | if (!lttng_condition_is_equal(condition_list_element->condition, | |
1230 | condition)) { | |
1231 | continue; | |
1232 | } | |
1233 | ||
1234 | cds_list_del(&condition_list_element->node); | |
1235 | /* | |
1236 | * The caller may be iterating on the client's conditions to | |
1237 | * tear down a client's connection. In this case, the condition | |
1238 | * will be destroyed at the end. | |
1239 | */ | |
1240 | if (condition != condition_list_element->condition) { | |
1241 | lttng_condition_destroy( | |
1242 | condition_list_element->condition); | |
1243 | } | |
1244 | free(condition_list_element); | |
1245 | condition_found = true; | |
1246 | break; | |
1247 | } | |
1248 | ||
1249 | if (!condition_found) { | |
1250 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_UNKNOWN_CONDITION; | |
1251 | goto end; | |
1252 | } | |
1253 | ||
1254 | /* | |
1255 | * Remove the client from the list of clients interested the trigger | |
1256 | * matching the condition. | |
1257 | */ | |
ed327204 JG |
1258 | client_list = get_client_list_from_condition(state, condition); |
1259 | if (!client_list) { | |
505b2d90 | 1260 | goto end; |
ab0ee2ca JG |
1261 | } |
1262 | ||
505b2d90 | 1263 | pthread_mutex_lock(&client_list->lock); |
ab0ee2ca | 1264 | cds_list_for_each_entry_safe(client_list_element, client_tmp, |
091fa780 | 1265 | &client_list->clients_list, node) { |
505b2d90 | 1266 | if (client_list_element->client->id != client->id) { |
ab0ee2ca JG |
1267 | continue; |
1268 | } | |
1269 | cds_list_del(&client_list_element->node); | |
1270 | free(client_list_element); | |
1271 | break; | |
1272 | } | |
505b2d90 JG |
1273 | pthread_mutex_unlock(&client_list->lock); |
1274 | notification_client_list_put(client_list); | |
1275 | client_list = NULL; | |
ab0ee2ca JG |
1276 | end: |
1277 | lttng_condition_destroy(condition); | |
1278 | if (_status) { | |
1279 | *_status = status; | |
1280 | } | |
1281 | return 0; | |
1282 | } | |
1283 | ||
83b934ad MD |
1284 | static |
1285 | void free_notification_client_rcu(struct rcu_head *node) | |
1286 | { | |
0114db0e | 1287 | free(lttng::utils::container_of(node, ¬ification_client::rcu_node)); |
83b934ad MD |
1288 | } |
1289 | ||
ab0ee2ca | 1290 | static |
f46376a1 | 1291 | void notification_client_destroy(struct notification_client *client) |
ab0ee2ca | 1292 | { |
ab0ee2ca JG |
1293 | if (!client) { |
1294 | return; | |
1295 | } | |
1296 | ||
505b2d90 JG |
1297 | /* |
1298 | * The client object is not reachable by other threads, no need to lock | |
1299 | * the client here. | |
1300 | */ | |
ab0ee2ca JG |
1301 | if (client->socket >= 0) { |
1302 | (void) lttcomm_close_unix_sock(client->socket); | |
ac1889bf | 1303 | client->socket = -1; |
ab0ee2ca | 1304 | } |
505b2d90 | 1305 | client->communication.active = false; |
882093ee JR |
1306 | lttng_payload_reset(&client->communication.inbound.payload); |
1307 | lttng_payload_reset(&client->communication.outbound.payload); | |
505b2d90 | 1308 | pthread_mutex_destroy(&client->lock); |
83b934ad | 1309 | call_rcu(&client->rcu_node, free_notification_client_rcu); |
ab0ee2ca JG |
1310 | } |
1311 | ||
1312 | /* | |
1313 | * Call with rcu_read_lock held (and hold for the lifetime of the returned | |
1314 | * client pointer). | |
1315 | */ | |
1316 | static | |
1317 | struct notification_client *get_client_from_socket(int socket, | |
1318 | struct notification_thread_state *state) | |
1319 | { | |
1320 | struct cds_lfht_iter iter; | |
1321 | struct cds_lfht_node *node; | |
1322 | struct notification_client *client = NULL; | |
1323 | ||
48b7cdc2 FD |
1324 | ASSERT_RCU_READ_LOCKED(); |
1325 | ||
ab0ee2ca | 1326 | cds_lfht_lookup(state->client_socket_ht, |
ac1889bf JG |
1327 | hash_client_socket(socket), |
1328 | match_client_socket, | |
ab0ee2ca JG |
1329 | (void *) (unsigned long) socket, |
1330 | &iter); | |
1331 | node = cds_lfht_iter_get_node(&iter); | |
1332 | if (!node) { | |
1333 | goto end; | |
1334 | } | |
1335 | ||
1336 | client = caa_container_of(node, struct notification_client, | |
1337 | client_socket_ht_node); | |
1338 | end: | |
1339 | return client; | |
1340 | } | |
1341 | ||
f2b3ef9f JG |
1342 | /* |
1343 | * Call with rcu_read_lock held (and hold for the lifetime of the returned | |
1344 | * client pointer). | |
1345 | */ | |
1346 | static | |
1347 | struct notification_client *get_client_from_id(notification_client_id id, | |
1348 | struct notification_thread_state *state) | |
1349 | { | |
1350 | struct cds_lfht_iter iter; | |
1351 | struct cds_lfht_node *node; | |
1352 | struct notification_client *client = NULL; | |
1353 | ||
48b7cdc2 FD |
1354 | ASSERT_RCU_READ_LOCKED(); |
1355 | ||
f2b3ef9f JG |
1356 | cds_lfht_lookup(state->client_id_ht, |
1357 | hash_client_id(id), | |
1358 | match_client_id, | |
1359 | &id, | |
1360 | &iter); | |
1361 | node = cds_lfht_iter_get_node(&iter); | |
1362 | if (!node) { | |
1363 | goto end; | |
1364 | } | |
1365 | ||
1366 | client = caa_container_of(node, struct notification_client, | |
1367 | client_id_ht_node); | |
1368 | end: | |
1369 | return client; | |
1370 | } | |
1371 | ||
ab0ee2ca | 1372 | static |
e8360425 | 1373 | bool buffer_usage_condition_applies_to_channel( |
51eab943 JG |
1374 | const struct lttng_condition *condition, |
1375 | const struct channel_info *channel_info) | |
ab0ee2ca JG |
1376 | { |
1377 | enum lttng_condition_status status; | |
e8360425 JD |
1378 | enum lttng_domain_type condition_domain; |
1379 | const char *condition_session_name = NULL; | |
1380 | const char *condition_channel_name = NULL; | |
ab0ee2ca | 1381 | |
e8360425 JD |
1382 | status = lttng_condition_buffer_usage_get_domain_type(condition, |
1383 | &condition_domain); | |
a0377dfe | 1384 | LTTNG_ASSERT(status == LTTNG_CONDITION_STATUS_OK); |
e8360425 | 1385 | if (channel_info->key.domain != condition_domain) { |
ab0ee2ca JG |
1386 | goto fail; |
1387 | } | |
1388 | ||
e8360425 JD |
1389 | status = lttng_condition_buffer_usage_get_session_name( |
1390 | condition, &condition_session_name); | |
a0377dfe | 1391 | LTTNG_ASSERT((status == LTTNG_CONDITION_STATUS_OK) && condition_session_name); |
e8360425 JD |
1392 | |
1393 | status = lttng_condition_buffer_usage_get_channel_name( | |
1394 | condition, &condition_channel_name); | |
a0377dfe | 1395 | LTTNG_ASSERT((status == LTTNG_CONDITION_STATUS_OK) && condition_channel_name); |
e8360425 JD |
1396 | |
1397 | if (strcmp(channel_info->session_info->name, condition_session_name)) { | |
1398 | goto fail; | |
1399 | } | |
1400 | if (strcmp(channel_info->name, condition_channel_name)) { | |
ab0ee2ca JG |
1401 | goto fail; |
1402 | } | |
1403 | ||
e8360425 JD |
1404 | return true; |
1405 | fail: | |
1406 | return false; | |
1407 | } | |
1408 | ||
1409 | static | |
1410 | bool session_consumed_size_condition_applies_to_channel( | |
51eab943 JG |
1411 | const struct lttng_condition *condition, |
1412 | const struct channel_info *channel_info) | |
e8360425 JD |
1413 | { |
1414 | enum lttng_condition_status status; | |
1415 | const char *condition_session_name = NULL; | |
1416 | ||
1417 | status = lttng_condition_session_consumed_size_get_session_name( | |
1418 | condition, &condition_session_name); | |
a0377dfe | 1419 | LTTNG_ASSERT((status == LTTNG_CONDITION_STATUS_OK) && condition_session_name); |
e8360425 JD |
1420 | |
1421 | if (strcmp(channel_info->session_info->name, condition_session_name)) { | |
ab0ee2ca JG |
1422 | goto fail; |
1423 | } | |
1424 | ||
e8360425 JD |
1425 | return true; |
1426 | fail: | |
1427 | return false; | |
1428 | } | |
ab0ee2ca | 1429 | |
51eab943 JG |
1430 | static |
1431 | bool trigger_applies_to_channel(const struct lttng_trigger *trigger, | |
1432 | const struct channel_info *channel_info) | |
1433 | { | |
1434 | const struct lttng_condition *condition; | |
e8360425 | 1435 | bool trigger_applies; |
ab0ee2ca | 1436 | |
51eab943 | 1437 | condition = lttng_trigger_get_const_condition(trigger); |
e8360425 | 1438 | if (!condition) { |
ab0ee2ca JG |
1439 | goto fail; |
1440 | } | |
e8360425 JD |
1441 | |
1442 | switch (lttng_condition_get_type(condition)) { | |
1443 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
1444 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
1445 | trigger_applies = buffer_usage_condition_applies_to_channel( | |
1446 | condition, channel_info); | |
1447 | break; | |
1448 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
1449 | trigger_applies = session_consumed_size_condition_applies_to_channel( | |
1450 | condition, channel_info); | |
1451 | break; | |
1452 | default: | |
ab0ee2ca JG |
1453 | goto fail; |
1454 | } | |
1455 | ||
e8360425 | 1456 | return trigger_applies; |
ab0ee2ca JG |
1457 | fail: |
1458 | return false; | |
1459 | } | |
1460 | ||
ed327204 JG |
1461 | /* Must be called with RCU read lock held. */ |
1462 | static | |
1463 | struct lttng_session_trigger_list *get_session_trigger_list( | |
1464 | struct notification_thread_state *state, | |
1465 | const char *session_name) | |
1466 | { | |
1467 | struct lttng_session_trigger_list *list = NULL; | |
1468 | struct cds_lfht_node *node; | |
1469 | struct cds_lfht_iter iter; | |
1470 | ||
48b7cdc2 FD |
1471 | ASSERT_RCU_READ_LOCKED(); |
1472 | ||
ed327204 JG |
1473 | cds_lfht_lookup(state->session_triggers_ht, |
1474 | hash_key_str(session_name, lttng_ht_seed), | |
1475 | match_session_trigger_list, | |
1476 | session_name, | |
1477 | &iter); | |
1478 | node = cds_lfht_iter_get_node(&iter); | |
1479 | if (!node) { | |
1480 | /* | |
1481 | * Not an error, the list of triggers applying to that session | |
1482 | * will be initialized when the session is created. | |
1483 | */ | |
bd0514a5 | 1484 | DBG("No trigger list found for session \"%s\" as it is not yet known to the notification system", |
ed327204 JG |
1485 | session_name); |
1486 | goto end; | |
1487 | } | |
1488 | ||
e742b055 | 1489 | list = caa_container_of(node, |
ed327204 JG |
1490 | struct lttng_session_trigger_list, |
1491 | session_triggers_ht_node); | |
1492 | end: | |
1493 | return list; | |
1494 | } | |
1495 | ||
ea9a44f0 JG |
1496 | /* |
1497 | * Allocate an empty lttng_session_trigger_list for the session named | |
1498 | * 'session_name'. | |
1499 | * | |
1500 | * No ownership of 'session_name' is assumed by the session trigger list. | |
1501 | * It is the caller's responsability to ensure the session name is alive | |
1502 | * for as long as this list is. | |
1503 | */ | |
1504 | static | |
1505 | struct lttng_session_trigger_list *lttng_session_trigger_list_create( | |
1506 | const char *session_name, | |
1507 | struct cds_lfht *session_triggers_ht) | |
1508 | { | |
1509 | struct lttng_session_trigger_list *list; | |
1510 | ||
64803277 | 1511 | list = zmalloc<lttng_session_trigger_list>(); |
ea9a44f0 JG |
1512 | if (!list) { |
1513 | goto end; | |
1514 | } | |
1515 | list->session_name = session_name; | |
1516 | CDS_INIT_LIST_HEAD(&list->list); | |
1517 | cds_lfht_node_init(&list->session_triggers_ht_node); | |
1518 | list->session_triggers_ht = session_triggers_ht; | |
1519 | ||
1520 | rcu_read_lock(); | |
1521 | /* Publish the list through the session_triggers_ht. */ | |
1522 | cds_lfht_add(session_triggers_ht, | |
1523 | hash_key_str(session_name, lttng_ht_seed), | |
1524 | &list->session_triggers_ht_node); | |
1525 | rcu_read_unlock(); | |
1526 | end: | |
1527 | return list; | |
1528 | } | |
1529 | ||
1530 | static | |
1531 | void free_session_trigger_list_rcu(struct rcu_head *node) | |
1532 | { | |
1533 | free(caa_container_of(node, struct lttng_session_trigger_list, | |
1534 | rcu_node)); | |
1535 | } | |
1536 | ||
1537 | static | |
1538 | void lttng_session_trigger_list_destroy(struct lttng_session_trigger_list *list) | |
1539 | { | |
1540 | struct lttng_trigger_list_element *trigger_list_element, *tmp; | |
1541 | ||
1542 | /* Empty the list element by element, and then free the list itself. */ | |
1543 | cds_list_for_each_entry_safe(trigger_list_element, tmp, | |
1544 | &list->list, node) { | |
1545 | cds_list_del(&trigger_list_element->node); | |
1546 | free(trigger_list_element); | |
1547 | } | |
1548 | rcu_read_lock(); | |
1549 | /* Unpublish the list from the session_triggers_ht. */ | |
1550 | cds_lfht_del(list->session_triggers_ht, | |
1551 | &list->session_triggers_ht_node); | |
1552 | rcu_read_unlock(); | |
1553 | call_rcu(&list->rcu_node, free_session_trigger_list_rcu); | |
1554 | } | |
1555 | ||
1556 | static | |
1557 | int lttng_session_trigger_list_add(struct lttng_session_trigger_list *list, | |
f2b3ef9f | 1558 | struct lttng_trigger *trigger) |
ea9a44f0 JG |
1559 | { |
1560 | int ret = 0; | |
1561 | struct lttng_trigger_list_element *new_element = | |
64803277 | 1562 | zmalloc<lttng_trigger_list_element>(); |
ea9a44f0 JG |
1563 | |
1564 | if (!new_element) { | |
1565 | ret = -1; | |
1566 | goto end; | |
1567 | } | |
1568 | CDS_INIT_LIST_HEAD(&new_element->node); | |
1569 | new_element->trigger = trigger; | |
1570 | cds_list_add(&new_element->node, &list->list); | |
1571 | end: | |
1572 | return ret; | |
1573 | } | |
1574 | ||
1575 | static | |
1576 | bool trigger_applies_to_session(const struct lttng_trigger *trigger, | |
1577 | const char *session_name) | |
1578 | { | |
1579 | bool applies = false; | |
1580 | const struct lttng_condition *condition; | |
1581 | ||
1582 | condition = lttng_trigger_get_const_condition(trigger); | |
1583 | switch (lttng_condition_get_type(condition)) { | |
1584 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
1585 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
1586 | { | |
1587 | enum lttng_condition_status condition_status; | |
1588 | const char *condition_session_name; | |
1589 | ||
1590 | condition_status = lttng_condition_session_rotation_get_session_name( | |
1591 | condition, &condition_session_name); | |
1592 | if (condition_status != LTTNG_CONDITION_STATUS_OK) { | |
bd0514a5 | 1593 | ERR("Failed to retrieve session rotation condition's session name"); |
ea9a44f0 JG |
1594 | goto end; |
1595 | } | |
1596 | ||
a0377dfe | 1597 | LTTNG_ASSERT(condition_session_name); |
ea9a44f0 JG |
1598 | applies = !strcmp(condition_session_name, session_name); |
1599 | break; | |
1600 | } | |
1601 | default: | |
1602 | goto end; | |
1603 | } | |
1604 | end: | |
1605 | return applies; | |
1606 | } | |
1607 | ||
1608 | /* | |
1609 | * Allocate and initialize an lttng_session_trigger_list which contains | |
1610 | * all triggers that apply to the session named 'session_name'. | |
1611 | * | |
1612 | * No ownership of 'session_name' is assumed by the session trigger list. | |
1613 | * It is the caller's responsability to ensure the session name is alive | |
1614 | * for as long as this list is. | |
1615 | */ | |
1616 | static | |
1617 | struct lttng_session_trigger_list *lttng_session_trigger_list_build( | |
1618 | const struct notification_thread_state *state, | |
1619 | const char *session_name) | |
1620 | { | |
1621 | int trigger_count = 0; | |
1622 | struct lttng_session_trigger_list *session_trigger_list = NULL; | |
1623 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
1624 | struct cds_lfht_iter iter; | |
1625 | ||
1626 | session_trigger_list = lttng_session_trigger_list_create(session_name, | |
1627 | state->session_triggers_ht); | |
1628 | ||
1629 | /* Add all triggers applying to the session named 'session_name'. */ | |
1630 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, | |
1631 | node) { | |
1632 | int ret; | |
1633 | ||
1634 | if (!trigger_applies_to_session(trigger_ht_element->trigger, | |
1635 | session_name)) { | |
1636 | continue; | |
1637 | } | |
1638 | ||
1639 | ret = lttng_session_trigger_list_add(session_trigger_list, | |
1640 | trigger_ht_element->trigger); | |
1641 | if (ret) { | |
1642 | goto error; | |
1643 | } | |
1644 | ||
1645 | trigger_count++; | |
1646 | } | |
1647 | ||
bd0514a5 | 1648 | DBG("Found %i triggers that apply to newly created session", |
ea9a44f0 JG |
1649 | trigger_count); |
1650 | return session_trigger_list; | |
1651 | error: | |
1652 | lttng_session_trigger_list_destroy(session_trigger_list); | |
1653 | return NULL; | |
1654 | } | |
1655 | ||
8abe313a JG |
1656 | static |
1657 | struct session_info *find_or_create_session_info( | |
1658 | struct notification_thread_state *state, | |
1659 | const char *name, uid_t uid, gid_t gid) | |
1660 | { | |
1661 | struct session_info *session = NULL; | |
1662 | struct cds_lfht_node *node; | |
1663 | struct cds_lfht_iter iter; | |
ea9a44f0 | 1664 | struct lttng_session_trigger_list *trigger_list; |
8abe313a JG |
1665 | |
1666 | rcu_read_lock(); | |
1667 | cds_lfht_lookup(state->sessions_ht, | |
1668 | hash_key_str(name, lttng_ht_seed), | |
1669 | match_session, | |
1670 | name, | |
1671 | &iter); | |
1672 | node = cds_lfht_iter_get_node(&iter); | |
1673 | if (node) { | |
bd0514a5 | 1674 | DBG("Found session info of session \"%s\" (uid = %i, gid = %i)", |
8abe313a JG |
1675 | name, uid, gid); |
1676 | session = caa_container_of(node, struct session_info, | |
1677 | sessions_ht_node); | |
a0377dfe FD |
1678 | LTTNG_ASSERT(session->uid == uid); |
1679 | LTTNG_ASSERT(session->gid == gid); | |
1eee26c5 JG |
1680 | session_info_get(session); |
1681 | goto end; | |
ea9a44f0 JG |
1682 | } |
1683 | ||
1684 | trigger_list = lttng_session_trigger_list_build(state, name); | |
1685 | if (!trigger_list) { | |
1686 | goto error; | |
8abe313a JG |
1687 | } |
1688 | ||
1eee26c5 JG |
1689 | session = session_info_create(name, uid, gid, trigger_list, |
1690 | state->sessions_ht); | |
8abe313a | 1691 | if (!session) { |
bd0514a5 | 1692 | ERR("Failed to allocation session info for session \"%s\" (uid = %i, gid = %i)", |
8abe313a | 1693 | name, uid, gid); |
b248644d | 1694 | lttng_session_trigger_list_destroy(trigger_list); |
ea9a44f0 | 1695 | goto error; |
8abe313a | 1696 | } |
ea9a44f0 | 1697 | trigger_list = NULL; |
577983cb JG |
1698 | |
1699 | cds_lfht_add(state->sessions_ht, hash_key_str(name, lttng_ht_seed), | |
9b63a4aa | 1700 | &session->sessions_ht_node); |
1eee26c5 | 1701 | end: |
8abe313a JG |
1702 | rcu_read_unlock(); |
1703 | return session; | |
ea9a44f0 JG |
1704 | error: |
1705 | rcu_read_unlock(); | |
1706 | session_info_put(session); | |
1707 | return NULL; | |
8abe313a JG |
1708 | } |
1709 | ||
ab0ee2ca JG |
1710 | static |
1711 | int handle_notification_thread_command_add_channel( | |
8abe313a JG |
1712 | struct notification_thread_state *state, |
1713 | const char *session_name, uid_t session_uid, gid_t session_gid, | |
1714 | const char *channel_name, enum lttng_domain_type channel_domain, | |
1715 | uint64_t channel_key_int, uint64_t channel_capacity, | |
1716 | enum lttng_error_code *cmd_result) | |
ab0ee2ca JG |
1717 | { |
1718 | struct cds_list_head trigger_list; | |
8abe313a JG |
1719 | struct channel_info *new_channel_info = NULL; |
1720 | struct channel_key channel_key = { | |
1721 | .key = channel_key_int, | |
1722 | .domain = channel_domain, | |
1723 | }; | |
ab0ee2ca JG |
1724 | struct lttng_channel_trigger_list *channel_trigger_list = NULL; |
1725 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
1726 | int trigger_count = 0; | |
1727 | struct cds_lfht_iter iter; | |
8abe313a | 1728 | struct session_info *session_info = NULL; |
ab0ee2ca | 1729 | |
bd0514a5 | 1730 | DBG("Adding channel %s from session %s, channel key = %" PRIu64 " in %s domain", |
8abe313a | 1731 | channel_name, session_name, channel_key_int, |
526200e4 | 1732 | lttng_domain_type_str(channel_domain)); |
ab0ee2ca JG |
1733 | |
1734 | CDS_INIT_LIST_HEAD(&trigger_list); | |
1735 | ||
8abe313a JG |
1736 | session_info = find_or_create_session_info(state, session_name, |
1737 | session_uid, session_gid); | |
1738 | if (!session_info) { | |
a9577b76 | 1739 | /* Allocation error or an internal error occurred. */ |
ab0ee2ca JG |
1740 | goto error; |
1741 | } | |
1742 | ||
8abe313a JG |
1743 | new_channel_info = channel_info_create(channel_name, &channel_key, |
1744 | channel_capacity, session_info); | |
1745 | if (!new_channel_info) { | |
1746 | goto error; | |
1747 | } | |
ab0ee2ca | 1748 | |
83b934ad | 1749 | rcu_read_lock(); |
ab0ee2ca JG |
1750 | /* Build a list of all triggers applying to the new channel. */ |
1751 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, | |
1752 | node) { | |
1753 | struct lttng_trigger_list_element *new_element; | |
1754 | ||
1755 | if (!trigger_applies_to_channel(trigger_ht_element->trigger, | |
8abe313a | 1756 | new_channel_info)) { |
ab0ee2ca JG |
1757 | continue; |
1758 | } | |
1759 | ||
64803277 | 1760 | new_element = zmalloc<lttng_trigger_list_element>(); |
ab0ee2ca | 1761 | if (!new_element) { |
83b934ad | 1762 | rcu_read_unlock(); |
ab0ee2ca JG |
1763 | goto error; |
1764 | } | |
1765 | CDS_INIT_LIST_HEAD(&new_element->node); | |
1766 | new_element->trigger = trigger_ht_element->trigger; | |
1767 | cds_list_add(&new_element->node, &trigger_list); | |
1768 | trigger_count++; | |
1769 | } | |
83b934ad | 1770 | rcu_read_unlock(); |
ab0ee2ca | 1771 | |
bd0514a5 | 1772 | DBG("Found %i triggers that apply to newly added channel", |
ab0ee2ca | 1773 | trigger_count); |
64803277 | 1774 | channel_trigger_list = zmalloc<lttng_channel_trigger_list>(); |
ab0ee2ca JG |
1775 | if (!channel_trigger_list) { |
1776 | goto error; | |
1777 | } | |
8abe313a | 1778 | channel_trigger_list->channel_key = new_channel_info->key; |
ab0ee2ca JG |
1779 | CDS_INIT_LIST_HEAD(&channel_trigger_list->list); |
1780 | cds_lfht_node_init(&channel_trigger_list->channel_triggers_ht_node); | |
1781 | cds_list_splice(&trigger_list, &channel_trigger_list->list); | |
1782 | ||
1783 | rcu_read_lock(); | |
1784 | /* Add channel to the channel_ht which owns the channel_infos. */ | |
1785 | cds_lfht_add(state->channels_ht, | |
8abe313a | 1786 | hash_channel_key(&new_channel_info->key), |
ab0ee2ca JG |
1787 | &new_channel_info->channels_ht_node); |
1788 | /* | |
1789 | * Add the list of triggers associated with this channel to the | |
1790 | * channel_triggers_ht. | |
1791 | */ | |
1792 | cds_lfht_add(state->channel_triggers_ht, | |
8abe313a | 1793 | hash_channel_key(&new_channel_info->key), |
ab0ee2ca JG |
1794 | &channel_trigger_list->channel_triggers_ht_node); |
1795 | rcu_read_unlock(); | |
1eee26c5 | 1796 | session_info_put(session_info); |
ab0ee2ca JG |
1797 | *cmd_result = LTTNG_OK; |
1798 | return 0; | |
1799 | error: | |
ab0ee2ca | 1800 | channel_info_destroy(new_channel_info); |
8abe313a | 1801 | session_info_put(session_info); |
ab0ee2ca JG |
1802 | return 1; |
1803 | } | |
1804 | ||
83b934ad MD |
1805 | static |
1806 | void free_channel_trigger_list_rcu(struct rcu_head *node) | |
1807 | { | |
1808 | free(caa_container_of(node, struct lttng_channel_trigger_list, | |
1809 | rcu_node)); | |
1810 | } | |
1811 | ||
1812 | static | |
1813 | void free_channel_state_sample_rcu(struct rcu_head *node) | |
1814 | { | |
1815 | free(caa_container_of(node, struct channel_state_sample, | |
1816 | rcu_node)); | |
1817 | } | |
1818 | ||
ab0ee2ca JG |
1819 | static |
1820 | int handle_notification_thread_command_remove_channel( | |
1821 | struct notification_thread_state *state, | |
1822 | uint64_t channel_key, enum lttng_domain_type domain, | |
1823 | enum lttng_error_code *cmd_result) | |
1824 | { | |
1825 | struct cds_lfht_node *node; | |
1826 | struct cds_lfht_iter iter; | |
1827 | struct lttng_channel_trigger_list *trigger_list; | |
1828 | struct lttng_trigger_list_element *trigger_list_element, *tmp; | |
1829 | struct channel_key key = { .key = channel_key, .domain = domain }; | |
1830 | struct channel_info *channel_info; | |
1831 | ||
bd0514a5 | 1832 | DBG("Removing channel key = %" PRIu64 " in %s domain", |
526200e4 | 1833 | channel_key, lttng_domain_type_str(domain)); |
ab0ee2ca JG |
1834 | |
1835 | rcu_read_lock(); | |
1836 | ||
1837 | cds_lfht_lookup(state->channel_triggers_ht, | |
1838 | hash_channel_key(&key), | |
1839 | match_channel_trigger_list, | |
1840 | &key, | |
1841 | &iter); | |
1842 | node = cds_lfht_iter_get_node(&iter); | |
1843 | /* | |
1844 | * There is a severe internal error if we are being asked to remove a | |
1845 | * channel that doesn't exist. | |
1846 | */ | |
1847 | if (!node) { | |
bd0514a5 | 1848 | ERR("Channel being removed is unknown to the notification thread"); |
ab0ee2ca JG |
1849 | goto end; |
1850 | } | |
1851 | ||
1852 | /* Free the list of triggers associated with this channel. */ | |
1853 | trigger_list = caa_container_of(node, struct lttng_channel_trigger_list, | |
1854 | channel_triggers_ht_node); | |
1855 | cds_list_for_each_entry_safe(trigger_list_element, tmp, | |
1856 | &trigger_list->list, node) { | |
1857 | cds_list_del(&trigger_list_element->node); | |
1858 | free(trigger_list_element); | |
1859 | } | |
1860 | cds_lfht_del(state->channel_triggers_ht, node); | |
83b934ad | 1861 | call_rcu(&trigger_list->rcu_node, free_channel_trigger_list_rcu); |
ab0ee2ca JG |
1862 | |
1863 | /* Free sampled channel state. */ | |
1864 | cds_lfht_lookup(state->channel_state_ht, | |
1865 | hash_channel_key(&key), | |
1866 | match_channel_state_sample, | |
1867 | &key, | |
1868 | &iter); | |
1869 | node = cds_lfht_iter_get_node(&iter); | |
1870 | /* | |
1871 | * This is expected to be NULL if the channel is destroyed before we | |
1872 | * received a sample. | |
1873 | */ | |
1874 | if (node) { | |
1875 | struct channel_state_sample *sample = caa_container_of(node, | |
1876 | struct channel_state_sample, | |
1877 | channel_state_ht_node); | |
1878 | ||
1879 | cds_lfht_del(state->channel_state_ht, node); | |
83b934ad | 1880 | call_rcu(&sample->rcu_node, free_channel_state_sample_rcu); |
ab0ee2ca JG |
1881 | } |
1882 | ||
1883 | /* Remove the channel from the channels_ht and free it. */ | |
1884 | cds_lfht_lookup(state->channels_ht, | |
1885 | hash_channel_key(&key), | |
1886 | match_channel_info, | |
1887 | &key, | |
1888 | &iter); | |
1889 | node = cds_lfht_iter_get_node(&iter); | |
a0377dfe | 1890 | LTTNG_ASSERT(node); |
ab0ee2ca JG |
1891 | channel_info = caa_container_of(node, struct channel_info, |
1892 | channels_ht_node); | |
1893 | cds_lfht_del(state->channels_ht, node); | |
1894 | channel_info_destroy(channel_info); | |
1895 | end: | |
1896 | rcu_read_unlock(); | |
1897 | *cmd_result = LTTNG_OK; | |
1898 | return 0; | |
1899 | } | |
1900 | ||
0ca52944 | 1901 | static |
ed327204 | 1902 | int handle_notification_thread_command_session_rotation( |
0ca52944 | 1903 | struct notification_thread_state *state, |
ed327204 JG |
1904 | enum notification_thread_command_type cmd_type, |
1905 | const char *session_name, uid_t session_uid, gid_t session_gid, | |
1906 | uint64_t trace_archive_chunk_id, | |
1907 | struct lttng_trace_archive_location *location, | |
1908 | enum lttng_error_code *_cmd_result) | |
0ca52944 | 1909 | { |
ed327204 JG |
1910 | int ret = 0; |
1911 | enum lttng_error_code cmd_result = LTTNG_OK; | |
1912 | struct lttng_session_trigger_list *trigger_list; | |
1913 | struct lttng_trigger_list_element *trigger_list_element; | |
1914 | struct session_info *session_info; | |
f2b3ef9f | 1915 | const struct lttng_credentials session_creds = { |
ff588497 JR |
1916 | .uid = LTTNG_OPTIONAL_INIT_VALUE(session_uid), |
1917 | .gid = LTTNG_OPTIONAL_INIT_VALUE(session_gid), | |
f2b3ef9f | 1918 | }; |
0ca52944 | 1919 | |
ed327204 JG |
1920 | rcu_read_lock(); |
1921 | ||
1922 | session_info = find_or_create_session_info(state, session_name, | |
1923 | session_uid, session_gid); | |
1924 | if (!session_info) { | |
a9577b76 | 1925 | /* Allocation error or an internal error occurred. */ |
ed327204 JG |
1926 | ret = -1; |
1927 | cmd_result = LTTNG_ERR_NOMEM; | |
1928 | goto end; | |
1929 | } | |
1930 | ||
1931 | session_info->rotation.ongoing = | |
1932 | cmd_type == NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING; | |
1933 | session_info->rotation.id = trace_archive_chunk_id; | |
1934 | trigger_list = get_session_trigger_list(state, session_name); | |
1935 | if (!trigger_list) { | |
bd0514a5 | 1936 | DBG("No triggers applying to session \"%s\" found", |
ed327204 JG |
1937 | session_name); |
1938 | goto end; | |
1939 | } | |
1940 | ||
1941 | cds_list_for_each_entry(trigger_list_element, &trigger_list->list, | |
1942 | node) { | |
1943 | const struct lttng_condition *condition; | |
f2b3ef9f | 1944 | struct lttng_trigger *trigger; |
ed327204 JG |
1945 | struct notification_client_list *client_list; |
1946 | struct lttng_evaluation *evaluation = NULL; | |
1947 | enum lttng_condition_type condition_type; | |
f2b3ef9f | 1948 | enum action_executor_status executor_status; |
ed327204 JG |
1949 | |
1950 | trigger = trigger_list_element->trigger; | |
1951 | condition = lttng_trigger_get_const_condition(trigger); | |
a0377dfe | 1952 | LTTNG_ASSERT(condition); |
ed327204 JG |
1953 | condition_type = lttng_condition_get_type(condition); |
1954 | ||
1955 | if (condition_type == LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING && | |
1956 | cmd_type != NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING) { | |
1957 | continue; | |
1958 | } else if (condition_type == LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED && | |
1959 | cmd_type != NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_COMPLETED) { | |
1960 | continue; | |
1961 | } | |
1962 | ||
ed327204 | 1963 | client_list = get_client_list_from_condition(state, condition); |
ed327204 JG |
1964 | if (cmd_type == NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING) { |
1965 | evaluation = lttng_evaluation_session_rotation_ongoing_create( | |
1966 | trace_archive_chunk_id); | |
1967 | } else { | |
1968 | evaluation = lttng_evaluation_session_rotation_completed_create( | |
1969 | trace_archive_chunk_id, location); | |
1970 | } | |
1971 | ||
1972 | if (!evaluation) { | |
1973 | /* Internal error */ | |
1974 | ret = -1; | |
1975 | cmd_result = LTTNG_ERR_UNK; | |
505b2d90 | 1976 | goto put_list; |
ed327204 JG |
1977 | } |
1978 | ||
f2b3ef9f JG |
1979 | /* |
1980 | * Ownership of `evaluation` transferred to the action executor | |
1981 | * no matter the result. | |
1982 | */ | |
72365501 JR |
1983 | executor_status = action_executor_enqueue_trigger( |
1984 | state->executor, trigger, evaluation, | |
1985 | &session_creds, client_list); | |
f2b3ef9f JG |
1986 | evaluation = NULL; |
1987 | switch (executor_status) { | |
1988 | case ACTION_EXECUTOR_STATUS_OK: | |
1989 | break; | |
1990 | case ACTION_EXECUTOR_STATUS_ERROR: | |
1991 | case ACTION_EXECUTOR_STATUS_INVALID: | |
1992 | /* | |
1993 | * TODO Add trigger identification (name/id) when | |
1994 | * it is added to the API. | |
1995 | */ | |
1996 | ERR("Fatal error occurred while enqueuing action associated with session rotation trigger"); | |
1997 | ret = -1; | |
1998 | goto put_list; | |
1999 | case ACTION_EXECUTOR_STATUS_OVERFLOW: | |
2000 | /* | |
2001 | * TODO Add trigger identification (name/id) when | |
2002 | * it is added to the API. | |
2003 | * | |
2004 | * Not a fatal error. | |
2005 | */ | |
2006 | WARN("No space left when enqueuing action associated with session rotation trigger"); | |
2007 | ret = 0; | |
2008 | goto put_list; | |
2009 | default: | |
2010 | abort(); | |
2011 | } | |
2012 | ||
505b2d90 JG |
2013 | put_list: |
2014 | notification_client_list_put(client_list); | |
ed327204 | 2015 | if (caa_unlikely(ret)) { |
505b2d90 | 2016 | break; |
ed327204 JG |
2017 | } |
2018 | } | |
2019 | end: | |
2020 | session_info_put(session_info); | |
2021 | *_cmd_result = cmd_result; | |
2022 | rcu_read_unlock(); | |
2023 | return ret; | |
0ca52944 JG |
2024 | } |
2025 | ||
d02d7404 JR |
2026 | static |
2027 | int handle_notification_thread_command_add_tracer_event_source( | |
2028 | struct notification_thread_state *state, | |
2029 | int tracer_event_source_fd, | |
2030 | enum lttng_domain_type domain_type, | |
2031 | enum lttng_error_code *_cmd_result) | |
2032 | { | |
2033 | int ret = 0; | |
2034 | enum lttng_error_code cmd_result = LTTNG_OK; | |
2035 | struct notification_event_tracer_event_source_element *element = NULL; | |
2036 | ||
64803277 | 2037 | element = zmalloc<notification_event_tracer_event_source_element>(); |
d02d7404 JR |
2038 | if (!element) { |
2039 | cmd_result = LTTNG_ERR_NOMEM; | |
2040 | ret = -1; | |
2041 | goto end; | |
2042 | } | |
2043 | ||
d02d7404 JR |
2044 | element->fd = tracer_event_source_fd; |
2045 | element->domain = domain_type; | |
2046 | ||
2047 | cds_list_add(&element->node, &state->tracer_event_sources_list); | |
2048 | ||
bd0514a5 | 2049 | DBG3("Adding tracer event source fd to poll set: tracer_event_source_fd = %d, domain = '%s'", |
d02d7404 JR |
2050 | tracer_event_source_fd, |
2051 | lttng_domain_type_str(domain_type)); | |
2052 | ||
2053 | /* Adding the read side pipe to the event poll. */ | |
8ebf1688 | 2054 | ret = lttng_poll_add(&state->events, tracer_event_source_fd, LPOLLPRI | LPOLLIN | LPOLLERR); |
d02d7404 | 2055 | if (ret < 0) { |
bd0514a5 | 2056 | ERR("Failed to add tracer event source to poll set: tracer_event_source_fd = %d, domain = '%s'", |
d02d7404 JR |
2057 | tracer_event_source_fd, |
2058 | lttng_domain_type_str(element->domain)); | |
2059 | cds_list_del(&element->node); | |
2060 | free(element); | |
2061 | goto end; | |
2062 | } | |
2063 | ||
2064 | element->is_fd_in_poll_set = true; | |
2065 | ||
2066 | end: | |
2067 | *_cmd_result = cmd_result; | |
2068 | return ret; | |
2069 | } | |
2070 | ||
8b524060 FD |
2071 | static |
2072 | int drain_event_notifier_notification_pipe( | |
2073 | struct notification_thread_state *state, | |
2074 | int pipe, enum lttng_domain_type domain) | |
2075 | { | |
1c9a0b0e | 2076 | struct lttng_poll_event events = {}; |
8b524060 FD |
2077 | int ret; |
2078 | ||
2079 | ret = lttng_poll_create(&events, 1, LTTNG_CLOEXEC); | |
2080 | if (ret < 0) { | |
bd0514a5 | 2081 | ERR("Error creating lttng_poll_event"); |
8b524060 FD |
2082 | goto end; |
2083 | } | |
2084 | ||
2085 | ret = lttng_poll_add(&events, pipe, LPOLLIN); | |
2086 | if (ret < 0) { | |
bd0514a5 | 2087 | ERR("Error adding fd event notifier notification pipe to lttng_poll_event: fd = %d", |
8b524060 FD |
2088 | pipe); |
2089 | goto end; | |
2090 | } | |
2091 | ||
2092 | while (true) { | |
2093 | /* | |
2094 | * Continue to consume notifications as long as there are new | |
2095 | * ones coming in. The tracer has been asked to stop producing | |
2096 | * them. | |
2097 | * | |
2098 | * LPOLLIN is explicitly checked since LPOLLHUP is implicitly | |
2099 | * monitored (on Linux, at least) and will be returned when | |
2100 | * the pipe is closed but empty. | |
2101 | */ | |
2102 | ret = lttng_poll_wait_interruptible(&events, 0); | |
a17b133b | 2103 | if (ret == 0 || (LTTNG_POLL_GETEV(&events, 0) & LPOLLIN) == 0) { |
8b524060 FD |
2104 | /* No more notification to be read on this pipe. */ |
2105 | ret = 0; | |
2106 | goto end; | |
2107 | } else if (ret < 0) { | |
2108 | PERROR("Failed on lttng_poll_wait_interruptible() call"); | |
2109 | ret = -1; | |
2110 | goto end; | |
2111 | } | |
2112 | ||
2113 | ret = handle_one_event_notifier_notification(state, pipe, domain); | |
2114 | if (ret) { | |
bd0514a5 | 2115 | ERR("Error consuming an event notifier notification from pipe: fd = %d", |
8b524060 FD |
2116 | pipe); |
2117 | } | |
2118 | } | |
2119 | end: | |
2120 | lttng_poll_clean(&events); | |
2121 | return ret; | |
2122 | } | |
2123 | ||
d02d7404 | 2124 | static |
34bf4f69 FD |
2125 | struct notification_event_tracer_event_source_element * |
2126 | find_tracer_event_source_element(struct notification_thread_state *state, | |
2127 | int tracer_event_source_fd) | |
d02d7404 | 2128 | { |
34bf4f69 | 2129 | struct notification_event_tracer_event_source_element *source_element; |
d02d7404 | 2130 | |
34bf4f69 | 2131 | cds_list_for_each_entry(source_element, |
d02d7404 | 2132 | &state->tracer_event_sources_list, node) { |
34bf4f69 FD |
2133 | if (source_element->fd == tracer_event_source_fd) { |
2134 | goto end; | |
d02d7404 | 2135 | } |
d02d7404 JR |
2136 | } |
2137 | ||
34bf4f69 FD |
2138 | source_element = NULL; |
2139 | end: | |
97cf926d | 2140 | return source_element; |
34bf4f69 | 2141 | } |
d02d7404 | 2142 | |
34bf4f69 FD |
2143 | static |
2144 | int remove_tracer_event_source_from_pollset( | |
2145 | struct notification_thread_state *state, | |
2146 | struct notification_event_tracer_event_source_element *source_element) | |
2147 | { | |
2148 | int ret = 0; | |
2149 | ||
a0377dfe | 2150 | LTTNG_ASSERT(source_element->is_fd_in_poll_set); |
d02d7404 | 2151 | |
bd0514a5 | 2152 | DBG3("Removing tracer event source from poll set: tracer_event_source_fd = %d, domain = '%s'", |
34bf4f69 | 2153 | source_element->fd, |
d02d7404 JR |
2154 | lttng_domain_type_str(source_element->domain)); |
2155 | ||
2156 | /* Removing the fd from the event poll set. */ | |
34bf4f69 | 2157 | ret = lttng_poll_del(&state->events, source_element->fd); |
d02d7404 | 2158 | if (ret < 0) { |
bd0514a5 | 2159 | ERR("Failed to remove tracer event source from poll set: tracer_event_source_fd = %d, domain = '%s'", |
34bf4f69 | 2160 | source_element->fd, |
d02d7404 | 2161 | lttng_domain_type_str(source_element->domain)); |
34bf4f69 | 2162 | ret = -1; |
d02d7404 JR |
2163 | goto end; |
2164 | } | |
2165 | ||
173900f6 JG |
2166 | source_element->is_fd_in_poll_set = false; |
2167 | ||
2ddbdc7a FD |
2168 | /* |
2169 | * Force the notification thread to restart the poll() loop to ensure | |
2170 | * that any events from the removed fd are removed. | |
2171 | */ | |
2172 | state->restart_poll = true; | |
2173 | ||
34bf4f69 | 2174 | ret = drain_event_notifier_notification_pipe(state, source_element->fd, |
8b524060 FD |
2175 | source_element->domain); |
2176 | if (ret) { | |
bd0514a5 | 2177 | ERR("Error draining event notifier notification: tracer_event_source_fd = %d, domain = %s", |
34bf4f69 | 2178 | source_element->fd, |
8b524060 | 2179 | lttng_domain_type_str(source_element->domain)); |
34bf4f69 | 2180 | ret = -1; |
8b524060 FD |
2181 | goto end; |
2182 | } | |
2183 | ||
d02d7404 | 2184 | end: |
d02d7404 JR |
2185 | return ret; |
2186 | } | |
2187 | ||
34bf4f69 | 2188 | int handle_notification_thread_tracer_event_source_died( |
d02d7404 JR |
2189 | struct notification_thread_state *state, |
2190 | int tracer_event_source_fd) | |
2191 | { | |
34bf4f69 FD |
2192 | int ret = 0; |
2193 | struct notification_event_tracer_event_source_element *source_element; | |
2194 | ||
2195 | source_element = find_tracer_event_source_element(state, | |
2196 | tracer_event_source_fd); | |
2197 | ||
a0377dfe | 2198 | LTTNG_ASSERT(source_element); |
34bf4f69 FD |
2199 | |
2200 | ret = remove_tracer_event_source_from_pollset(state, source_element); | |
2201 | if (ret) { | |
2202 | ERR("Failed to remove dead tracer event source from poll set"); | |
2203 | } | |
d02d7404 | 2204 | |
34bf4f69 FD |
2205 | return ret; |
2206 | } | |
2207 | ||
2208 | static | |
2209 | int handle_notification_thread_command_remove_tracer_event_source( | |
2210 | struct notification_thread_state *state, | |
2211 | int tracer_event_source_fd, | |
2212 | enum lttng_error_code *_cmd_result) | |
2213 | { | |
2214 | int ret = 0; | |
2215 | enum lttng_error_code cmd_result = LTTNG_OK; | |
2216 | struct notification_event_tracer_event_source_element *source_element = NULL; | |
2217 | ||
2218 | source_element = find_tracer_event_source_element(state, | |
2219 | tracer_event_source_fd); | |
2220 | ||
a0377dfe | 2221 | LTTNG_ASSERT(source_element); |
34bf4f69 FD |
2222 | |
2223 | /* Remove the tracer source from the list. */ | |
2224 | cds_list_del(&source_element->node); | |
2225 | ||
2226 | if (!source_element->is_fd_in_poll_set) { | |
2227 | /* Skip the poll set removal. */ | |
2228 | goto end; | |
2229 | } | |
2230 | ||
2231 | ret = remove_tracer_event_source_from_pollset(state, source_element); | |
2232 | if (ret) { | |
2233 | ERR("Failed to remove tracer event source from poll set"); | |
2234 | cmd_result = LTTNG_ERR_FATAL; | |
2235 | } | |
2236 | ||
2237 | end: | |
2238 | free(source_element); | |
2239 | *_cmd_result = cmd_result; | |
d02d7404 JR |
2240 | return ret; |
2241 | } | |
2242 | ||
fbc9f37d | 2243 | static int handle_notification_thread_command_list_triggers( |
f46376a1 | 2244 | struct notification_thread_handle *handle __attribute__((unused)), |
fbc9f37d JR |
2245 | struct notification_thread_state *state, |
2246 | uid_t client_uid, | |
2247 | struct lttng_triggers **triggers, | |
2248 | enum lttng_error_code *_cmd_result) | |
2249 | { | |
2250 | int ret = 0; | |
2251 | enum lttng_error_code cmd_result = LTTNG_OK; | |
2252 | struct cds_lfht_iter iter; | |
2253 | struct lttng_trigger_ht_element *trigger_ht_element; | |
2254 | struct lttng_triggers *local_triggers = NULL; | |
2255 | const struct lttng_credentials *creds; | |
2256 | ||
2257 | rcu_read_lock(); | |
2258 | ||
2259 | local_triggers = lttng_triggers_create(); | |
2260 | if (!local_triggers) { | |
2261 | /* Not a fatal error. */ | |
2262 | cmd_result = LTTNG_ERR_NOMEM; | |
2263 | goto end; | |
2264 | } | |
2265 | ||
2266 | cds_lfht_for_each_entry(state->triggers_ht, &iter, | |
2267 | trigger_ht_element, node) { | |
2268 | /* | |
2269 | * Only return the triggers to which the client has access. | |
2270 | * The root user has visibility over all triggers. | |
2271 | */ | |
2272 | creds = lttng_trigger_get_credentials(trigger_ht_element->trigger); | |
2273 | if (client_uid != lttng_credentials_get_uid(creds) && client_uid != 0) { | |
2274 | continue; | |
2275 | } | |
2276 | ||
2277 | ret = lttng_triggers_add(local_triggers, | |
2278 | trigger_ht_element->trigger); | |
2279 | if (ret < 0) { | |
2280 | /* Not a fatal error. */ | |
2281 | ret = 0; | |
2282 | cmd_result = LTTNG_ERR_NOMEM; | |
2283 | goto end; | |
2284 | } | |
2285 | } | |
2286 | ||
2287 | /* Transferring ownership to the caller. */ | |
2288 | *triggers = local_triggers; | |
2289 | local_triggers = NULL; | |
2290 | ||
2291 | end: | |
2292 | rcu_read_unlock(); | |
2293 | lttng_triggers_destroy(local_triggers); | |
2294 | *_cmd_result = cmd_result; | |
2295 | return ret; | |
2296 | } | |
2297 | ||
8790759c FD |
2298 | static inline void get_trigger_info_for_log(const struct lttng_trigger *trigger, |
2299 | const char **trigger_name, | |
2300 | uid_t *trigger_owner_uid) | |
2301 | { | |
2302 | enum lttng_trigger_status trigger_status; | |
2303 | ||
2304 | trigger_status = lttng_trigger_get_name(trigger, trigger_name); | |
2305 | switch (trigger_status) { | |
2306 | case LTTNG_TRIGGER_STATUS_OK: | |
2307 | break; | |
2308 | case LTTNG_TRIGGER_STATUS_UNSET: | |
0efb2ad7 | 2309 | *trigger_name = "(anonymous)"; |
8790759c FD |
2310 | break; |
2311 | default: | |
2312 | abort(); | |
2313 | } | |
2314 | ||
2315 | trigger_status = lttng_trigger_get_owner_uid(trigger, | |
2316 | trigger_owner_uid); | |
a0377dfe | 2317 | LTTNG_ASSERT(trigger_status == LTTNG_TRIGGER_STATUS_OK); |
8790759c FD |
2318 | } |
2319 | ||
2320 | static int handle_notification_thread_command_get_trigger( | |
2321 | struct notification_thread_state *state, | |
2322 | const struct lttng_trigger *trigger, | |
2323 | struct lttng_trigger **registered_trigger, | |
2324 | enum lttng_error_code *_cmd_result) | |
2325 | { | |
2326 | int ret = -1; | |
2327 | struct cds_lfht_iter iter; | |
2328 | struct lttng_trigger_ht_element *trigger_ht_element; | |
2329 | enum lttng_error_code cmd_result = LTTNG_ERR_TRIGGER_NOT_FOUND; | |
2330 | const char *trigger_name; | |
2331 | uid_t trigger_owner_uid; | |
2332 | ||
2333 | rcu_read_lock(); | |
2334 | ||
2335 | cds_lfht_for_each_entry( | |
2336 | state->triggers_ht, &iter, trigger_ht_element, node) { | |
2337 | if (lttng_trigger_is_equal( | |
2338 | trigger, trigger_ht_element->trigger)) { | |
2339 | /* Take one reference on the return trigger. */ | |
2340 | *registered_trigger = trigger_ht_element->trigger; | |
2341 | lttng_trigger_get(*registered_trigger); | |
2342 | ret = 0; | |
2343 | cmd_result = LTTNG_OK; | |
2344 | goto end; | |
2345 | } | |
2346 | } | |
2347 | ||
2348 | /* Not a fatal error if the trigger is not found. */ | |
2349 | get_trigger_info_for_log(trigger, &trigger_name, &trigger_owner_uid); | |
87661585 | 2350 | DBG("Failed to retrieve registered version of trigger: trigger name = '%s', trigger owner uid = %d", |
8790759c FD |
2351 | trigger_name, (int) trigger_owner_uid); |
2352 | ||
2353 | ret = 0; | |
2354 | ||
2355 | end: | |
2356 | rcu_read_unlock(); | |
2357 | *_cmd_result = cmd_result; | |
2358 | return ret; | |
2359 | } | |
2360 | ||
1da26331 | 2361 | static |
959e3c66 | 2362 | bool condition_is_supported(struct lttng_condition *condition) |
1da26331 | 2363 | { |
959e3c66 | 2364 | bool is_supported; |
1da26331 JG |
2365 | |
2366 | switch (lttng_condition_get_type(condition)) { | |
2367 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
2368 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
2369 | { | |
959e3c66 | 2370 | int ret; |
1da26331 JG |
2371 | enum lttng_domain_type domain; |
2372 | ||
2373 | ret = lttng_condition_buffer_usage_get_domain_type(condition, | |
2374 | &domain); | |
a0377dfe | 2375 | LTTNG_ASSERT(ret == 0); |
1da26331 JG |
2376 | |
2377 | if (domain != LTTNG_DOMAIN_KERNEL) { | |
959e3c66 | 2378 | is_supported = true; |
1da26331 JG |
2379 | goto end; |
2380 | } | |
2381 | ||
2382 | /* | |
2383 | * Older kernel tracers don't expose the API to monitor their | |
2384 | * buffers. Therefore, we reject triggers that require that | |
2385 | * mechanism to be available to be evaluated. | |
959e3c66 JR |
2386 | * |
2387 | * Assume unsupported on error. | |
1da26331 | 2388 | */ |
959e3c66 JR |
2389 | is_supported = kernel_supports_ring_buffer_snapshot_sample_positions() == 1; |
2390 | break; | |
2391 | } | |
8dbb86b8 | 2392 | case LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES: |
959e3c66 JR |
2393 | { |
2394 | const struct lttng_event_rule *event_rule; | |
2395 | enum lttng_domain_type domain; | |
2396 | const enum lttng_condition_status status = | |
8dbb86b8 | 2397 | lttng_condition_event_rule_matches_get_rule( |
959e3c66 JR |
2398 | condition, &event_rule); |
2399 | ||
a0377dfe | 2400 | LTTNG_ASSERT(status == LTTNG_CONDITION_STATUS_OK); |
959e3c66 JR |
2401 | |
2402 | domain = lttng_event_rule_get_domain_type(event_rule); | |
2403 | if (domain != LTTNG_DOMAIN_KERNEL) { | |
2404 | is_supported = true; | |
2405 | goto end; | |
2406 | } | |
2407 | ||
2408 | /* | |
2409 | * Older kernel tracers can't emit notification. Therefore, we | |
2410 | * reject triggers that require that mechanism to be available | |
2411 | * to be evaluated. | |
2412 | * | |
2413 | * Assume unsupported on error. | |
2414 | */ | |
2415 | is_supported = kernel_supports_event_notifiers() == 1; | |
1da26331 JG |
2416 | break; |
2417 | } | |
2418 | default: | |
959e3c66 | 2419 | is_supported = true; |
1da26331 JG |
2420 | } |
2421 | end: | |
959e3c66 | 2422 | return is_supported; |
1da26331 JG |
2423 | } |
2424 | ||
51eab943 JG |
2425 | /* Must be called with RCU read lock held. */ |
2426 | static | |
f2b3ef9f | 2427 | int bind_trigger_to_matching_session(struct lttng_trigger *trigger, |
51eab943 JG |
2428 | struct notification_thread_state *state) |
2429 | { | |
2430 | int ret = 0; | |
51eab943 JG |
2431 | const struct lttng_condition *condition; |
2432 | const char *session_name; | |
2433 | struct lttng_session_trigger_list *trigger_list; | |
2434 | ||
48b7cdc2 FD |
2435 | ASSERT_RCU_READ_LOCKED(); |
2436 | ||
51eab943 JG |
2437 | condition = lttng_trigger_get_const_condition(trigger); |
2438 | switch (lttng_condition_get_type(condition)) { | |
2439 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
2440 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
2441 | { | |
2442 | enum lttng_condition_status status; | |
2443 | ||
2444 | status = lttng_condition_session_rotation_get_session_name( | |
2445 | condition, &session_name); | |
2446 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
bd0514a5 | 2447 | ERR("Failed to bind trigger to session: unable to get 'session_rotation' condition's session name"); |
51eab943 JG |
2448 | ret = -1; |
2449 | goto end; | |
2450 | } | |
2451 | break; | |
2452 | } | |
2453 | default: | |
2454 | ret = -1; | |
2455 | goto end; | |
2456 | } | |
2457 | ||
ed327204 JG |
2458 | trigger_list = get_session_trigger_list(state, session_name); |
2459 | if (!trigger_list) { | |
bd0514a5 | 2460 | DBG("Unable to bind trigger applying to session \"%s\" as it is not yet known to the notification system", |
51eab943 JG |
2461 | session_name); |
2462 | goto end; | |
51eab943 | 2463 | |
ed327204 | 2464 | } |
51eab943 | 2465 | |
bd0514a5 | 2466 | DBG("Newly registered trigger bound to session \"%s\"", |
51eab943 JG |
2467 | session_name); |
2468 | ret = lttng_session_trigger_list_add(trigger_list, trigger); | |
2469 | end: | |
2470 | return ret; | |
2471 | } | |
2472 | ||
2473 | /* Must be called with RCU read lock held. */ | |
2474 | static | |
f2b3ef9f | 2475 | int bind_trigger_to_matching_channels(struct lttng_trigger *trigger, |
51eab943 JG |
2476 | struct notification_thread_state *state) |
2477 | { | |
2478 | int ret = 0; | |
2479 | struct cds_lfht_node *node; | |
2480 | struct cds_lfht_iter iter; | |
2481 | struct channel_info *channel; | |
2482 | ||
48b7cdc2 FD |
2483 | ASSERT_RCU_READ_LOCKED(); |
2484 | ||
51eab943 JG |
2485 | cds_lfht_for_each_entry(state->channels_ht, &iter, channel, |
2486 | channels_ht_node) { | |
2487 | struct lttng_trigger_list_element *trigger_list_element; | |
2488 | struct lttng_channel_trigger_list *trigger_list; | |
a5d64ae7 | 2489 | struct cds_lfht_iter lookup_iter; |
51eab943 JG |
2490 | |
2491 | if (!trigger_applies_to_channel(trigger, channel)) { | |
2492 | continue; | |
2493 | } | |
2494 | ||
2495 | cds_lfht_lookup(state->channel_triggers_ht, | |
2496 | hash_channel_key(&channel->key), | |
2497 | match_channel_trigger_list, | |
2498 | &channel->key, | |
a5d64ae7 MD |
2499 | &lookup_iter); |
2500 | node = cds_lfht_iter_get_node(&lookup_iter); | |
a0377dfe | 2501 | LTTNG_ASSERT(node); |
51eab943 JG |
2502 | trigger_list = caa_container_of(node, |
2503 | struct lttng_channel_trigger_list, | |
2504 | channel_triggers_ht_node); | |
2505 | ||
64803277 | 2506 | trigger_list_element = zmalloc<lttng_trigger_list_element>(); |
51eab943 JG |
2507 | if (!trigger_list_element) { |
2508 | ret = -1; | |
2509 | goto end; | |
2510 | } | |
2511 | CDS_INIT_LIST_HEAD(&trigger_list_element->node); | |
2512 | trigger_list_element->trigger = trigger; | |
2513 | cds_list_add(&trigger_list_element->node, &trigger_list->list); | |
bd0514a5 | 2514 | DBG("Newly registered trigger bound to channel \"%s\"", |
51eab943 JG |
2515 | channel->name); |
2516 | } | |
2517 | end: | |
2518 | return ret; | |
2519 | } | |
2520 | ||
f2b3ef9f JG |
2521 | static |
2522 | bool is_trigger_action_notify(const struct lttng_trigger *trigger) | |
2523 | { | |
2524 | bool is_notify = false; | |
2525 | unsigned int i, count; | |
2526 | enum lttng_action_status action_status; | |
2527 | const struct lttng_action *action = | |
2528 | lttng_trigger_get_const_action(trigger); | |
2529 | enum lttng_action_type action_type; | |
2530 | ||
a0377dfe | 2531 | LTTNG_ASSERT(action); |
17182cfd | 2532 | action_type = lttng_action_get_type(action); |
f2b3ef9f JG |
2533 | if (action_type == LTTNG_ACTION_TYPE_NOTIFY) { |
2534 | is_notify = true; | |
2535 | goto end; | |
7c2fae7c | 2536 | } else if (action_type != LTTNG_ACTION_TYPE_LIST) { |
f2b3ef9f JG |
2537 | goto end; |
2538 | } | |
2539 | ||
702f26c8 | 2540 | action_status = lttng_action_list_get_count(action, &count); |
a0377dfe | 2541 | LTTNG_ASSERT(action_status == LTTNG_ACTION_STATUS_OK); |
f2b3ef9f JG |
2542 | |
2543 | for (i = 0; i < count; i++) { | |
2544 | const struct lttng_action *inner_action = | |
702f26c8 | 2545 | lttng_action_list_get_at_index( |
f2b3ef9f JG |
2546 | action, i); |
2547 | ||
17182cfd | 2548 | action_type = lttng_action_get_type(inner_action); |
f2b3ef9f JG |
2549 | if (action_type == LTTNG_ACTION_TYPE_NOTIFY) { |
2550 | is_notify = true; | |
2551 | goto end; | |
2552 | } | |
2553 | } | |
2554 | ||
2555 | end: | |
2556 | return is_notify; | |
2557 | } | |
2558 | ||
242388e4 JR |
2559 | static bool trigger_name_taken(struct notification_thread_state *state, |
2560 | const struct lttng_trigger *trigger) | |
2561 | { | |
2562 | struct cds_lfht_iter iter; | |
2563 | ||
2564 | /* | |
2565 | * No duplicata is allowed in the triggers_by_name_uid_ht. | |
2566 | * The match is done against the trigger name and uid. | |
2567 | */ | |
2568 | cds_lfht_lookup(state->triggers_by_name_uid_ht, | |
2569 | hash_trigger_by_name_uid(trigger), | |
2570 | match_trigger_by_name_uid, | |
2571 | trigger, | |
2572 | &iter); | |
2573 | return !!cds_lfht_iter_get_node(&iter); | |
2574 | } | |
2575 | ||
2576 | static | |
2577 | enum lttng_error_code generate_trigger_name( | |
2578 | struct notification_thread_state *state, | |
2579 | struct lttng_trigger *trigger, const char **name) | |
2580 | { | |
2581 | enum lttng_error_code ret_code = LTTNG_OK; | |
2582 | bool taken = false; | |
2583 | enum lttng_trigger_status status; | |
2584 | ||
2585 | do { | |
2586 | const int ret = lttng_trigger_generate_name(trigger, | |
2587 | state->trigger_id.name_offset++); | |
2588 | if (ret) { | |
2589 | /* The only reason this can fail right now. */ | |
2590 | ret_code = LTTNG_ERR_NOMEM; | |
2591 | break; | |
2592 | } | |
2593 | ||
2594 | status = lttng_trigger_get_name(trigger, name); | |
a0377dfe | 2595 | LTTNG_ASSERT(status == LTTNG_TRIGGER_STATUS_OK); |
242388e4 JR |
2596 | |
2597 | taken = trigger_name_taken(state, trigger); | |
2598 | } while (taken || state->trigger_id.name_offset == UINT64_MAX); | |
2599 | ||
2600 | return ret_code; | |
2601 | } | |
2602 | ||
2758e38b FD |
2603 | static inline |
2604 | void notif_thread_state_remove_trigger_ht_elem( | |
2605 | struct notification_thread_state *state, | |
2606 | struct lttng_trigger_ht_element *trigger_ht_element) | |
2607 | { | |
a0377dfe FD |
2608 | LTTNG_ASSERT(state); |
2609 | LTTNG_ASSERT(trigger_ht_element); | |
2758e38b FD |
2610 | |
2611 | cds_lfht_del(state->triggers_ht, &trigger_ht_element->node); | |
2612 | cds_lfht_del(state->triggers_by_name_uid_ht, &trigger_ht_element->node_by_name_uid); | |
2613 | } | |
2614 | ||
6487ad53 FD |
2615 | static |
2616 | enum lttng_error_code setup_tracer_notifier( | |
2617 | struct notification_thread_state *state, | |
2618 | struct lttng_trigger *trigger) | |
2619 | { | |
2620 | enum lttng_error_code ret; | |
2621 | enum event_notifier_error_accounting_status error_accounting_status; | |
2622 | struct cds_lfht_node *node; | |
2623 | uint64_t error_counter_index = 0; | |
2624 | struct lttng_condition *condition = lttng_trigger_get_condition(trigger); | |
2625 | struct notification_trigger_tokens_ht_element *trigger_tokens_ht_element = NULL; | |
2626 | ||
64803277 | 2627 | trigger_tokens_ht_element = zmalloc<notification_trigger_tokens_ht_element>(); |
6487ad53 FD |
2628 | if (!trigger_tokens_ht_element) { |
2629 | ret = LTTNG_ERR_NOMEM; | |
2630 | goto end; | |
2631 | } | |
2632 | ||
2633 | /* Add trigger token to the trigger_tokens_ht. */ | |
2634 | cds_lfht_node_init(&trigger_tokens_ht_element->node); | |
2635 | trigger_tokens_ht_element->token = LTTNG_OPTIONAL_GET(trigger->tracer_token); | |
2636 | trigger_tokens_ht_element->trigger = trigger; | |
2637 | ||
2638 | node = cds_lfht_add_unique(state->trigger_tokens_ht, | |
2639 | hash_key_u64(&trigger_tokens_ht_element->token, lttng_ht_seed), | |
2640 | match_trigger_token, | |
2641 | &trigger_tokens_ht_element->token, | |
2642 | &trigger_tokens_ht_element->node); | |
2643 | if (node != &trigger_tokens_ht_element->node) { | |
2644 | ret = LTTNG_ERR_TRIGGER_EXISTS; | |
2645 | goto error_free_ht_element; | |
2646 | } | |
2647 | ||
2648 | error_accounting_status = event_notifier_error_accounting_register_event_notifier( | |
2649 | trigger, &error_counter_index); | |
2650 | if (error_accounting_status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) { | |
2651 | if (error_accounting_status == EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_NO_INDEX_AVAILABLE) { | |
7c2fae7c | 2652 | DBG("Trigger list error accounting counter full."); |
6487ad53 FD |
2653 | ret = LTTNG_ERR_EVENT_NOTIFIER_ERROR_ACCOUNTING_FULL; |
2654 | } else { | |
2655 | ERR("Error registering trigger for error accounting"); | |
2656 | ret = LTTNG_ERR_EVENT_NOTIFIER_REGISTRATION; | |
2657 | } | |
2658 | ||
2659 | goto error_remove_ht_element; | |
2660 | } | |
2661 | ||
8dbb86b8 | 2662 | lttng_condition_event_rule_matches_set_error_counter_index( |
6487ad53 FD |
2663 | condition, error_counter_index); |
2664 | ||
2665 | ret = LTTNG_OK; | |
2666 | goto end; | |
2667 | ||
2668 | error_remove_ht_element: | |
2669 | cds_lfht_del(state->trigger_tokens_ht, &trigger_tokens_ht_element->node); | |
2670 | error_free_ht_element: | |
2671 | free(trigger_tokens_ht_element); | |
2672 | end: | |
2673 | return ret; | |
2674 | } | |
2675 | ||
ab0ee2ca | 2676 | /* |
f2b3ef9f | 2677 | * FIXME A client's credentials are not checked when registering a trigger. |
ab0ee2ca | 2678 | * |
1da26331 | 2679 | * The effects of this are benign since: |
ab0ee2ca | 2680 | * - The client will succeed in registering the trigger, as it is valid, |
51eab943 | 2681 | * - The trigger will, internally, be bound to the channel/session, |
ab0ee2ca JG |
2682 | * - The notifications will not be sent since the client's credentials |
2683 | * are checked against the channel at that moment. | |
1da26331 JG |
2684 | * |
2685 | * If this function returns a non-zero value, it means something is | |
50ca7858 | 2686 | * fundamentally broken and the whole subsystem/thread will be torn down. |
1da26331 JG |
2687 | * |
2688 | * If a non-fatal error occurs, just set the cmd_result to the appropriate | |
2689 | * error code. | |
ab0ee2ca JG |
2690 | */ |
2691 | static | |
2692 | int handle_notification_thread_command_register_trigger( | |
8abe313a JG |
2693 | struct notification_thread_state *state, |
2694 | struct lttng_trigger *trigger, | |
0efb2ad7 | 2695 | bool is_trigger_anonymous, |
8abe313a | 2696 | enum lttng_error_code *cmd_result) |
ab0ee2ca JG |
2697 | { |
2698 | int ret = 0; | |
2699 | struct lttng_condition *condition; | |
ab0ee2ca JG |
2700 | struct notification_client_list *client_list = NULL; |
2701 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
ab0ee2ca | 2702 | struct cds_lfht_node *node; |
242388e4 | 2703 | const char* trigger_name; |
ab0ee2ca | 2704 | bool free_trigger = true; |
f2b3ef9f JG |
2705 | struct lttng_evaluation *evaluation = NULL; |
2706 | struct lttng_credentials object_creds; | |
ff588497 JR |
2707 | uid_t object_uid; |
2708 | gid_t object_gid; | |
f2b3ef9f | 2709 | enum action_executor_status executor_status; |
e6887944 JR |
2710 | const uint64_t trigger_tracer_token = |
2711 | state->trigger_id.next_tracer_token++; | |
ab0ee2ca JG |
2712 | |
2713 | rcu_read_lock(); | |
2714 | ||
e6887944 JR |
2715 | /* Set the trigger's tracer token. */ |
2716 | lttng_trigger_set_tracer_token(trigger, trigger_tracer_token); | |
2717 | ||
0efb2ad7 JG |
2718 | if (!is_trigger_anonymous) { |
2719 | if (lttng_trigger_get_name(trigger, &trigger_name) == | |
2720 | LTTNG_TRIGGER_STATUS_UNSET) { | |
2721 | const enum lttng_error_code ret_code = | |
2722 | generate_trigger_name(state, trigger, | |
2723 | &trigger_name); | |
242388e4 | 2724 | |
0efb2ad7 JG |
2725 | if (ret_code != LTTNG_OK) { |
2726 | /* Fatal error. */ | |
2727 | ret = -1; | |
2728 | *cmd_result = ret_code; | |
2729 | goto error; | |
2730 | } | |
2731 | } else if (trigger_name_taken(state, trigger)) { | |
2732 | /* Not a fatal error. */ | |
2733 | *cmd_result = LTTNG_ERR_TRIGGER_EXISTS; | |
2734 | ret = 0; | |
242388e4 JR |
2735 | goto error; |
2736 | } | |
0efb2ad7 JG |
2737 | } else { |
2738 | trigger_name = "(anonymous)"; | |
242388e4 JR |
2739 | } |
2740 | ||
ab0ee2ca | 2741 | condition = lttng_trigger_get_condition(trigger); |
a0377dfe | 2742 | LTTNG_ASSERT(condition); |
1da26331 | 2743 | |
959e3c66 JR |
2744 | /* Some conditions require tracers to implement a minimal ABI version. */ |
2745 | if (!condition_is_supported(condition)) { | |
1da26331 JG |
2746 | *cmd_result = LTTNG_ERR_NOT_SUPPORTED; |
2747 | goto error; | |
1da26331 JG |
2748 | } |
2749 | ||
64803277 | 2750 | trigger_ht_element = zmalloc<lttng_trigger_ht_element>(); |
ab0ee2ca JG |
2751 | if (!trigger_ht_element) { |
2752 | ret = -1; | |
2753 | goto error; | |
2754 | } | |
2755 | ||
2756 | /* Add trigger to the trigger_ht. */ | |
2757 | cds_lfht_node_init(&trigger_ht_element->node); | |
242388e4 | 2758 | cds_lfht_node_init(&trigger_ht_element->node_by_name_uid); |
ab0ee2ca JG |
2759 | trigger_ht_element->trigger = trigger; |
2760 | ||
2761 | node = cds_lfht_add_unique(state->triggers_ht, | |
2762 | lttng_condition_hash(condition), | |
242388e4 JR |
2763 | match_trigger, |
2764 | trigger, | |
ab0ee2ca JG |
2765 | &trigger_ht_element->node); |
2766 | if (node != &trigger_ht_element->node) { | |
2767 | /* Not a fatal error, simply report it to the client. */ | |
2768 | *cmd_result = LTTNG_ERR_TRIGGER_EXISTS; | |
2769 | goto error_free_ht_element; | |
2770 | } | |
2771 | ||
242388e4 JR |
2772 | node = cds_lfht_add_unique(state->triggers_by_name_uid_ht, |
2773 | hash_trigger_by_name_uid(trigger), | |
2774 | match_trigger_by_name_uid, | |
2775 | trigger, | |
2776 | &trigger_ht_element->node_by_name_uid); | |
2777 | if (node != &trigger_ht_element->node_by_name_uid) { | |
75e540c6 JG |
2778 | /* Internal error: add to triggers_ht should have failed. */ |
2779 | ret = -1; | |
242388e4 JR |
2780 | goto error_free_ht_element; |
2781 | } | |
2782 | ||
9c374932 JR |
2783 | /* From this point consider the trigger registered. */ |
2784 | lttng_trigger_set_as_registered(trigger); | |
2785 | ||
6487ad53 FD |
2786 | /* |
2787 | * Some triggers might need a tracer notifier depending on its | |
2788 | * condition and actions. | |
2789 | */ | |
2790 | if (lttng_trigger_needs_tracer_notifier(trigger)) { | |
2791 | enum lttng_error_code error_code; | |
e7c93cf9 | 2792 | |
6487ad53 FD |
2793 | error_code = setup_tracer_notifier(state, trigger); |
2794 | if (error_code != LTTNG_OK) { | |
2758e38b FD |
2795 | notif_thread_state_remove_trigger_ht_elem(state, |
2796 | trigger_ht_element); | |
6487ad53 FD |
2797 | if (error_code == LTTNG_ERR_NOMEM) { |
2798 | ret = -1; | |
2799 | } else { | |
2800 | *cmd_result = error_code; | |
2801 | ret = 0; | |
90aa04a1 FD |
2802 | } |
2803 | ||
6487ad53 | 2804 | goto error_free_ht_element; |
90aa04a1 | 2805 | } |
e7c93cf9 JR |
2806 | } |
2807 | ||
ab0ee2ca JG |
2808 | /* |
2809 | * The rest only applies to triggers that have a "notify" action. | |
2810 | * It is not skipped as this is the only action type currently | |
2811 | * supported. | |
2812 | */ | |
f2b3ef9f | 2813 | if (is_trigger_action_notify(trigger)) { |
091fa780 FD |
2814 | /* |
2815 | * Find or create the client list of this condition. It may | |
2816 | * already be present if another trigger is already registered | |
2817 | * with the same condition. | |
2818 | */ | |
2819 | client_list = get_client_list_from_condition(state, condition); | |
f2b3ef9f | 2820 | if (!client_list) { |
091fa780 FD |
2821 | /* |
2822 | * No client list for this condition yet. We create new | |
2823 | * one and build it up. | |
2824 | */ | |
2825 | client_list = notification_client_list_create(state, condition); | |
2826 | if (!client_list) { | |
2827 | ERR("Error creating notification client list for trigger %s", trigger->name); | |
2828 | goto error_free_ht_element; | |
f2b3ef9f | 2829 | } |
ab0ee2ca | 2830 | } |
f2b3ef9f | 2831 | |
091fa780 FD |
2832 | CDS_INIT_LIST_HEAD(&trigger_ht_element->client_list_trigger_node); |
2833 | ||
2834 | pthread_mutex_lock(&client_list->lock); | |
2835 | cds_list_add(&trigger_ht_element->client_list_trigger_node, &client_list->triggers_list); | |
2836 | pthread_mutex_unlock(&client_list->lock); | |
ab0ee2ca JG |
2837 | } |
2838 | ||
091fa780 FD |
2839 | /* |
2840 | * Ownership of the trigger and of its wrapper was transfered to | |
2841 | * the triggers_ht. Same for token ht element if necessary. | |
2842 | */ | |
2843 | trigger_ht_element = NULL; | |
2844 | free_trigger = false; | |
2845 | ||
f82f93a1 | 2846 | switch (get_condition_binding_object(condition)) { |
51eab943 JG |
2847 | case LTTNG_OBJECT_TYPE_SESSION: |
2848 | /* Add the trigger to the list if it matches a known session. */ | |
2849 | ret = bind_trigger_to_matching_session(trigger, state); | |
2850 | if (ret) { | |
091fa780 | 2851 | goto error_free_ht_element; |
ab0ee2ca | 2852 | } |
f82f93a1 | 2853 | break; |
51eab943 JG |
2854 | case LTTNG_OBJECT_TYPE_CHANNEL: |
2855 | /* | |
2856 | * Add the trigger to list of triggers bound to the channels | |
2857 | * currently known. | |
2858 | */ | |
2859 | ret = bind_trigger_to_matching_channels(trigger, state); | |
2860 | if (ret) { | |
091fa780 | 2861 | goto error_free_ht_element; |
ab0ee2ca | 2862 | } |
51eab943 JG |
2863 | break; |
2864 | case LTTNG_OBJECT_TYPE_NONE: | |
2865 | break; | |
2866 | default: | |
f2b3ef9f | 2867 | ERR("Unknown object type on which to bind a newly registered trigger was encountered"); |
51eab943 | 2868 | ret = -1; |
091fa780 | 2869 | goto error_free_ht_element; |
ab0ee2ca JG |
2870 | } |
2871 | ||
2ae99f0b | 2872 | /* |
f2b3ef9f JG |
2873 | * The new trigger's condition must be evaluated against the current |
2874 | * state. | |
2875 | * | |
2876 | * In the case of `notify` action, nothing preventing clients from | |
2877 | * subscribing to a condition before the corresponding trigger is | |
2878 | * registered, we have to evaluate this new condition right away. | |
2ae99f0b JG |
2879 | * |
2880 | * At some point, we were waiting for the next "evaluation" (e.g. on | |
2881 | * reception of a channel sample) to evaluate this new condition, but | |
2882 | * that was broken. | |
2883 | * | |
2884 | * The reason it was broken is that waiting for the next sample | |
2885 | * does not allow us to properly handle transitions for edge-triggered | |
2886 | * conditions. | |
2887 | * | |
2888 | * Consider this example: when we handle a new channel sample, we | |
2889 | * evaluate each conditions twice: once with the previous state, and | |
2890 | * again with the newest state. We then use those two results to | |
2891 | * determine whether a state change happened: a condition was false and | |
2892 | * became true. If a state change happened, we have to notify clients. | |
2893 | * | |
2894 | * Now, if a client subscribes to a given notification and registers | |
2895 | * a trigger *after* that subscription, we have to make sure the | |
2896 | * condition is evaluated at this point while considering only the | |
2897 | * current state. Otherwise, the next evaluation cycle may only see | |
2898 | * that the evaluations remain the same (true for samples n-1 and n) and | |
2899 | * the client will never know that the condition has been met. | |
2900 | */ | |
f2b3ef9f JG |
2901 | switch (get_condition_binding_object(condition)) { |
2902 | case LTTNG_OBJECT_TYPE_SESSION: | |
2903 | ret = evaluate_session_condition_for_client(condition, state, | |
ff588497 JR |
2904 | &evaluation, &object_uid, |
2905 | &object_gid); | |
bc8daafb JG |
2906 | LTTNG_OPTIONAL_SET(&object_creds.uid, object_uid); |
2907 | LTTNG_OPTIONAL_SET(&object_creds.gid, object_gid); | |
b42ada90 | 2908 | break; |
f2b3ef9f JG |
2909 | case LTTNG_OBJECT_TYPE_CHANNEL: |
2910 | ret = evaluate_channel_condition_for_client(condition, state, | |
ff588497 JR |
2911 | &evaluation, &object_uid, |
2912 | &object_gid); | |
bc8daafb JG |
2913 | LTTNG_OPTIONAL_SET(&object_creds.uid, object_uid); |
2914 | LTTNG_OPTIONAL_SET(&object_creds.gid, object_gid); | |
f2b3ef9f JG |
2915 | break; |
2916 | case LTTNG_OBJECT_TYPE_NONE: | |
2917 | ret = 0; | |
242388e4 | 2918 | break; |
f2b3ef9f JG |
2919 | case LTTNG_OBJECT_TYPE_UNKNOWN: |
2920 | default: | |
2921 | ret = -1; | |
242388e4 | 2922 | break; |
f2b3ef9f JG |
2923 | } |
2924 | ||
2925 | if (ret) { | |
2926 | /* Fatal error. */ | |
091fa780 | 2927 | goto error_free_ht_element; |
f2b3ef9f JG |
2928 | } |
2929 | ||
2930 | DBG("Newly registered trigger's condition evaluated to %s", | |
2931 | evaluation ? "true" : "false"); | |
2932 | if (!evaluation) { | |
2933 | /* Evaluation yielded nothing. Normal exit. */ | |
2934 | ret = 0; | |
091fa780 | 2935 | goto success; |
2ae99f0b JG |
2936 | } |
2937 | ||
2938 | /* | |
f2b3ef9f JG |
2939 | * Ownership of `evaluation` transferred to the action executor |
2940 | * no matter the result. | |
2ae99f0b | 2941 | */ |
72365501 JR |
2942 | executor_status = action_executor_enqueue_trigger(state->executor, |
2943 | trigger, evaluation, &object_creds, client_list); | |
f2b3ef9f JG |
2944 | evaluation = NULL; |
2945 | switch (executor_status) { | |
2946 | case ACTION_EXECUTOR_STATUS_OK: | |
2947 | break; | |
2948 | case ACTION_EXECUTOR_STATUS_ERROR: | |
2949 | case ACTION_EXECUTOR_STATUS_INVALID: | |
2950 | /* | |
2951 | * TODO Add trigger identification (name/id) when | |
2952 | * it is added to the API. | |
2953 | */ | |
2954 | ERR("Fatal error occurred while enqueuing action associated to newly registered trigger"); | |
2955 | ret = -1; | |
091fa780 | 2956 | goto error_free_ht_element; |
f2b3ef9f JG |
2957 | case ACTION_EXECUTOR_STATUS_OVERFLOW: |
2958 | /* | |
2959 | * TODO Add trigger identification (name/id) when | |
2960 | * it is added to the API. | |
2961 | * | |
2962 | * Not a fatal error. | |
2963 | */ | |
2964 | WARN("No space left when enqueuing action associated to newly registered trigger"); | |
2965 | ret = 0; | |
091fa780 | 2966 | goto success; |
f2b3ef9f JG |
2967 | default: |
2968 | abort(); | |
2969 | } | |
2ae99f0b | 2970 | |
091fa780 | 2971 | success: |
ab0ee2ca | 2972 | *cmd_result = LTTNG_OK; |
e6887944 JR |
2973 | DBG("Registered trigger: name = `%s`, tracer token = %" PRIu64, |
2974 | trigger_name, trigger_tracer_token); | |
091fa780 | 2975 | goto end; |
505b2d90 | 2976 | |
ab0ee2ca | 2977 | error_free_ht_element: |
242388e4 JR |
2978 | if (trigger_ht_element) { |
2979 | /* Delayed removal due to RCU constraint on delete. */ | |
2980 | call_rcu(&trigger_ht_element->rcu_node, | |
2981 | free_lttng_trigger_ht_element_rcu); | |
2982 | } | |
ab0ee2ca JG |
2983 | error: |
2984 | if (free_trigger) { | |
9c374932 JR |
2985 | /* |
2986 | * Other objects might have a reference to the trigger, mark it | |
2987 | * as unregistered. | |
2988 | */ | |
2989 | lttng_trigger_set_as_unregistered(trigger); | |
ab0ee2ca JG |
2990 | lttng_trigger_destroy(trigger); |
2991 | } | |
091fa780 | 2992 | end: |
ab0ee2ca JG |
2993 | rcu_read_unlock(); |
2994 | return ret; | |
2995 | } | |
2996 | ||
83b934ad MD |
2997 | static |
2998 | void free_lttng_trigger_ht_element_rcu(struct rcu_head *node) | |
2999 | { | |
3000 | free(caa_container_of(node, struct lttng_trigger_ht_element, | |
3001 | rcu_node)); | |
3002 | } | |
3003 | ||
e7c93cf9 JR |
3004 | static |
3005 | void free_notification_trigger_tokens_ht_element_rcu(struct rcu_head *node) | |
3006 | { | |
3007 | free(caa_container_of(node, struct notification_trigger_tokens_ht_element, | |
3008 | rcu_node)); | |
3009 | } | |
3010 | ||
6487ad53 FD |
3011 | static |
3012 | void teardown_tracer_notifier(struct notification_thread_state *state, | |
3013 | const struct lttng_trigger *trigger) | |
3014 | { | |
3015 | struct cds_lfht_iter iter; | |
3016 | struct notification_trigger_tokens_ht_element *trigger_tokens_ht_element; | |
3017 | ||
3018 | cds_lfht_for_each_entry(state->trigger_tokens_ht, &iter, | |
3019 | trigger_tokens_ht_element, node) { | |
3020 | ||
3021 | if (!lttng_trigger_is_equal(trigger, | |
3022 | trigger_tokens_ht_element->trigger)) { | |
3023 | continue; | |
3024 | } | |
3025 | ||
3026 | event_notifier_error_accounting_unregister_event_notifier( | |
3027 | trigger_tokens_ht_element->trigger); | |
3028 | ||
3029 | /* TODO talk to all app and remove it */ | |
bd0514a5 | 3030 | DBG("Removed trigger from tokens_ht"); |
6487ad53 FD |
3031 | cds_lfht_del(state->trigger_tokens_ht, |
3032 | &trigger_tokens_ht_element->node); | |
3033 | ||
3034 | call_rcu(&trigger_tokens_ht_element->rcu_node, | |
3035 | free_notification_trigger_tokens_ht_element_rcu); | |
3036 | ||
3037 | break; | |
3038 | } | |
3039 | } | |
3040 | ||
cc2295b5 | 3041 | static |
ab0ee2ca JG |
3042 | int handle_notification_thread_command_unregister_trigger( |
3043 | struct notification_thread_state *state, | |
ac16173e | 3044 | const struct lttng_trigger *trigger, |
ab0ee2ca JG |
3045 | enum lttng_error_code *_cmd_reply) |
3046 | { | |
3047 | struct cds_lfht_iter iter; | |
ed327204 | 3048 | struct cds_lfht_node *triggers_ht_node; |
ab0ee2ca JG |
3049 | struct lttng_channel_trigger_list *trigger_list; |
3050 | struct notification_client_list *client_list; | |
ab0ee2ca | 3051 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; |
ac16173e | 3052 | const struct lttng_condition *condition = lttng_trigger_get_const_condition( |
ab0ee2ca | 3053 | trigger); |
ab0ee2ca JG |
3054 | enum lttng_error_code cmd_reply; |
3055 | ||
3056 | rcu_read_lock(); | |
3057 | ||
3058 | cds_lfht_lookup(state->triggers_ht, | |
3059 | lttng_condition_hash(condition), | |
242388e4 JR |
3060 | match_trigger, |
3061 | trigger, | |
ab0ee2ca JG |
3062 | &iter); |
3063 | triggers_ht_node = cds_lfht_iter_get_node(&iter); | |
3064 | if (!triggers_ht_node) { | |
3065 | cmd_reply = LTTNG_ERR_TRIGGER_NOT_FOUND; | |
3066 | goto end; | |
3067 | } else { | |
3068 | cmd_reply = LTTNG_OK; | |
3069 | } | |
3070 | ||
9c374932 JR |
3071 | trigger_ht_element = caa_container_of(triggers_ht_node, |
3072 | struct lttng_trigger_ht_element, node); | |
3073 | ||
ab0ee2ca JG |
3074 | /* Remove trigger from channel_triggers_ht. */ |
3075 | cds_lfht_for_each_entry(state->channel_triggers_ht, &iter, trigger_list, | |
3076 | channel_triggers_ht_node) { | |
3077 | struct lttng_trigger_list_element *trigger_element, *tmp; | |
3078 | ||
3079 | cds_list_for_each_entry_safe(trigger_element, tmp, | |
3080 | &trigger_list->list, node) { | |
e8f7fa11 | 3081 | if (!lttng_trigger_is_equal(trigger, trigger_element->trigger)) { |
ab0ee2ca JG |
3082 | continue; |
3083 | } | |
3084 | ||
bd0514a5 | 3085 | DBG("Removed trigger from channel_triggers_ht"); |
ab0ee2ca | 3086 | cds_list_del(&trigger_element->node); |
e4db5ace JR |
3087 | /* A trigger can only appear once per channel */ |
3088 | break; | |
ab0ee2ca JG |
3089 | } |
3090 | } | |
3091 | ||
6487ad53 FD |
3092 | if (lttng_trigger_needs_tracer_notifier(trigger)) { |
3093 | teardown_tracer_notifier(state, trigger); | |
e7c93cf9 JR |
3094 | } |
3095 | ||
51367634 JR |
3096 | if (is_trigger_action_notify(trigger)) { |
3097 | /* | |
3098 | * Remove and release the client list from | |
3099 | * notification_trigger_clients_ht. | |
3100 | */ | |
3101 | client_list = get_client_list_from_condition(state, condition); | |
a0377dfe | 3102 | LTTNG_ASSERT(client_list); |
ed327204 | 3103 | |
091fa780 FD |
3104 | pthread_mutex_lock(&client_list->lock); |
3105 | cds_list_del(&trigger_ht_element->client_list_trigger_node); | |
3106 | pthread_mutex_unlock(&client_list->lock); | |
3107 | ||
51367634 JR |
3108 | /* Put new reference and the hashtable's reference. */ |
3109 | notification_client_list_put(client_list); | |
3110 | notification_client_list_put(client_list); | |
3111 | client_list = NULL; | |
3112 | } | |
ab0ee2ca | 3113 | |
2758e38b FD |
3114 | /* Remove trigger from triggers_ht. */ |
3115 | notif_thread_state_remove_trigger_ht_elem(state, trigger_ht_element); | |
ab0ee2ca | 3116 | |
7ca172c1 | 3117 | /* Release the ownership of the trigger. */ |
ab0ee2ca | 3118 | lttng_trigger_destroy(trigger_ht_element->trigger); |
83b934ad | 3119 | call_rcu(&trigger_ht_element->rcu_node, free_lttng_trigger_ht_element_rcu); |
ab0ee2ca JG |
3120 | end: |
3121 | rcu_read_unlock(); | |
3122 | if (_cmd_reply) { | |
3123 | *_cmd_reply = cmd_reply; | |
3124 | } | |
3125 | return 0; | |
3126 | } | |
3127 | ||
f370852f JR |
3128 | static |
3129 | int pop_cmd_queue(struct notification_thread_handle *handle, | |
3130 | struct notification_thread_command **cmd) | |
3131 | { | |
3132 | int ret; | |
3133 | uint64_t counter; | |
3134 | ||
3135 | pthread_mutex_lock(&handle->cmd_queue.lock); | |
3136 | ret = lttng_read(handle->cmd_queue.event_fd, &counter, sizeof(counter)); | |
3137 | if (ret != sizeof(counter)) { | |
3138 | ret = -1; | |
3139 | goto error_unlock; | |
3140 | } | |
3141 | ||
f370852f JR |
3142 | *cmd = cds_list_first_entry(&handle->cmd_queue.list, |
3143 | struct notification_thread_command, cmd_list_node); | |
3144 | cds_list_del(&((*cmd)->cmd_list_node)); | |
3145 | ret = 0; | |
3146 | ||
3147 | error_unlock: | |
3148 | pthread_mutex_unlock(&handle->cmd_queue.lock); | |
3149 | return ret; | |
3150 | } | |
3151 | ||
ab0ee2ca JG |
3152 | /* Returns 0 on success, 1 on exit requested, negative value on error. */ |
3153 | int handle_notification_thread_command( | |
3154 | struct notification_thread_handle *handle, | |
3155 | struct notification_thread_state *state) | |
3156 | { | |
3157 | int ret; | |
ab0ee2ca JG |
3158 | struct notification_thread_command *cmd; |
3159 | ||
f370852f JR |
3160 | ret = pop_cmd_queue(handle, &cmd); |
3161 | if (ret) { | |
ab0ee2ca JG |
3162 | goto error; |
3163 | } | |
3164 | ||
bd0514a5 | 3165 | DBG("Received `%s` command", |
6900ae81 | 3166 | notification_command_type_str(cmd->type)); |
ab0ee2ca JG |
3167 | switch (cmd->type) { |
3168 | case NOTIFICATION_COMMAND_TYPE_REGISTER_TRIGGER: | |
ac16173e JG |
3169 | ret = handle_notification_thread_command_register_trigger(state, |
3170 | cmd->parameters.register_trigger.trigger, | |
0efb2ad7 | 3171 | cmd->parameters.register_trigger.is_trigger_anonymous, |
ab0ee2ca JG |
3172 | &cmd->reply_code); |
3173 | break; | |
3174 | case NOTIFICATION_COMMAND_TYPE_UNREGISTER_TRIGGER: | |
ab0ee2ca | 3175 | ret = handle_notification_thread_command_unregister_trigger( |
ac16173e JG |
3176 | state, |
3177 | cmd->parameters.unregister_trigger.trigger, | |
ab0ee2ca JG |
3178 | &cmd->reply_code); |
3179 | break; | |
3180 | case NOTIFICATION_COMMAND_TYPE_ADD_CHANNEL: | |
ab0ee2ca | 3181 | ret = handle_notification_thread_command_add_channel( |
8abe313a JG |
3182 | state, |
3183 | cmd->parameters.add_channel.session.name, | |
3184 | cmd->parameters.add_channel.session.uid, | |
3185 | cmd->parameters.add_channel.session.gid, | |
3186 | cmd->parameters.add_channel.channel.name, | |
3187 | cmd->parameters.add_channel.channel.domain, | |
3188 | cmd->parameters.add_channel.channel.key, | |
3189 | cmd->parameters.add_channel.channel.capacity, | |
ab0ee2ca JG |
3190 | &cmd->reply_code); |
3191 | break; | |
3192 | case NOTIFICATION_COMMAND_TYPE_REMOVE_CHANNEL: | |
ab0ee2ca JG |
3193 | ret = handle_notification_thread_command_remove_channel( |
3194 | state, cmd->parameters.remove_channel.key, | |
3195 | cmd->parameters.remove_channel.domain, | |
3196 | &cmd->reply_code); | |
3197 | break; | |
0ca52944 | 3198 | case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING: |
0ca52944 | 3199 | case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_COMPLETED: |
ed327204 | 3200 | ret = handle_notification_thread_command_session_rotation( |
0ca52944 | 3201 | state, |
ed327204 JG |
3202 | cmd->type, |
3203 | cmd->parameters.session_rotation.session_name, | |
3204 | cmd->parameters.session_rotation.uid, | |
3205 | cmd->parameters.session_rotation.gid, | |
3206 | cmd->parameters.session_rotation.trace_archive_chunk_id, | |
3207 | cmd->parameters.session_rotation.location, | |
0ca52944 JG |
3208 | &cmd->reply_code); |
3209 | break; | |
d02d7404 JR |
3210 | case NOTIFICATION_COMMAND_TYPE_ADD_TRACER_EVENT_SOURCE: |
3211 | ret = handle_notification_thread_command_add_tracer_event_source( | |
3212 | state, | |
3213 | cmd->parameters.tracer_event_source.tracer_event_source_fd, | |
3214 | cmd->parameters.tracer_event_source.domain, | |
3215 | &cmd->reply_code); | |
3216 | break; | |
3217 | case NOTIFICATION_COMMAND_TYPE_REMOVE_TRACER_EVENT_SOURCE: | |
3218 | ret = handle_notification_thread_command_remove_tracer_event_source( | |
3219 | state, | |
3220 | cmd->parameters.tracer_event_source.tracer_event_source_fd, | |
3221 | &cmd->reply_code); | |
3222 | break; | |
fbc9f37d JR |
3223 | case NOTIFICATION_COMMAND_TYPE_LIST_TRIGGERS: |
3224 | { | |
3225 | struct lttng_triggers *triggers = NULL; | |
3226 | ||
3227 | ret = handle_notification_thread_command_list_triggers( | |
3228 | handle, | |
3229 | state, | |
3230 | cmd->parameters.list_triggers.uid, | |
3231 | &triggers, | |
3232 | &cmd->reply_code); | |
3233 | cmd->reply.list_triggers.triggers = triggers; | |
3234 | ret = 0; | |
3235 | break; | |
3236 | } | |
ab0ee2ca | 3237 | case NOTIFICATION_COMMAND_TYPE_QUIT: |
ab0ee2ca JG |
3238 | cmd->reply_code = LTTNG_OK; |
3239 | ret = 1; | |
3240 | goto end; | |
8790759c FD |
3241 | case NOTIFICATION_COMMAND_TYPE_GET_TRIGGER: |
3242 | { | |
3243 | struct lttng_trigger *trigger = NULL; | |
3244 | ||
3245 | ret = handle_notification_thread_command_get_trigger(state, | |
3246 | cmd->parameters.get_trigger.trigger, &trigger, | |
3247 | &cmd->reply_code); | |
3248 | cmd->reply.get_trigger.trigger = trigger; | |
3249 | break; | |
3250 | } | |
f2b3ef9f JG |
3251 | case NOTIFICATION_COMMAND_TYPE_CLIENT_COMMUNICATION_UPDATE: |
3252 | { | |
3253 | const enum client_transmission_status client_status = | |
3254 | cmd->parameters.client_communication_update | |
3255 | .status; | |
3256 | const notification_client_id client_id = | |
3257 | cmd->parameters.client_communication_update.id; | |
3258 | struct notification_client *client; | |
3259 | ||
3260 | rcu_read_lock(); | |
3261 | client = get_client_from_id(client_id, state); | |
3262 | ||
3263 | if (!client) { | |
3264 | /* | |
3265 | * Client error was probably already picked-up by the | |
3266 | * notification thread or it has disconnected | |
3267 | * gracefully while this command was queued. | |
3268 | */ | |
3269 | DBG("Failed to find notification client to update communication status, client id = %" PRIu64, | |
3270 | client_id); | |
3271 | ret = 0; | |
3272 | } else { | |
f2b3ef9f JG |
3273 | ret = client_handle_transmission_status( |
3274 | client, client_status, state); | |
f2b3ef9f JG |
3275 | } |
3276 | rcu_read_unlock(); | |
3277 | break; | |
3278 | } | |
ab0ee2ca | 3279 | default: |
bd0514a5 | 3280 | ERR("Unknown internal command received"); |
ab0ee2ca JG |
3281 | goto error_unlock; |
3282 | } | |
3283 | ||
3284 | if (ret) { | |
3285 | goto error_unlock; | |
3286 | } | |
3287 | end: | |
0ab399e0 JG |
3288 | if (cmd->is_async) { |
3289 | free(cmd); | |
3290 | cmd = NULL; | |
3291 | } else { | |
3292 | lttng_waiter_wake_up(&cmd->reply_waiter); | |
3293 | } | |
ab0ee2ca JG |
3294 | return ret; |
3295 | error_unlock: | |
3296 | /* Wake-up and return a fatal error to the calling thread. */ | |
8ada111f | 3297 | lttng_waiter_wake_up(&cmd->reply_waiter); |
ab0ee2ca JG |
3298 | cmd->reply_code = LTTNG_ERR_FATAL; |
3299 | error: | |
3300 | /* Indicate a fatal error to the caller. */ | |
3301 | return -1; | |
3302 | } | |
3303 | ||
ab0ee2ca JG |
3304 | static |
3305 | int socket_set_non_blocking(int socket) | |
3306 | { | |
3307 | int ret, flags; | |
3308 | ||
3309 | /* Set the pipe as non-blocking. */ | |
3310 | ret = fcntl(socket, F_GETFL, 0); | |
3311 | if (ret == -1) { | |
3312 | PERROR("fcntl get socket flags"); | |
3313 | goto end; | |
3314 | } | |
3315 | flags = ret; | |
3316 | ||
3317 | ret = fcntl(socket, F_SETFL, flags | O_NONBLOCK); | |
3318 | if (ret == -1) { | |
3319 | PERROR("fcntl set O_NONBLOCK socket flag"); | |
3320 | goto end; | |
3321 | } | |
3322 | DBG("Client socket (fd = %i) set as non-blocking", socket); | |
3323 | end: | |
3324 | return ret; | |
3325 | } | |
3326 | ||
3327 | static | |
14fa22f8 | 3328 | int client_reset_inbound_state(struct notification_client *client) |
ab0ee2ca JG |
3329 | { |
3330 | int ret; | |
3331 | ||
882093ee JR |
3332 | |
3333 | lttng_payload_clear(&client->communication.inbound.payload); | |
ab0ee2ca JG |
3334 | |
3335 | client->communication.inbound.bytes_to_receive = | |
3336 | sizeof(struct lttng_notification_channel_message); | |
3337 | client->communication.inbound.msg_type = | |
3338 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN; | |
ab0ee2ca JG |
3339 | LTTNG_SOCK_SET_UID_CRED(&client->communication.inbound.creds, -1); |
3340 | LTTNG_SOCK_SET_GID_CRED(&client->communication.inbound.creds, -1); | |
14fa22f8 | 3341 | ret = lttng_dynamic_buffer_set_size( |
882093ee | 3342 | &client->communication.inbound.payload.buffer, |
14fa22f8 | 3343 | client->communication.inbound.bytes_to_receive); |
882093ee | 3344 | |
14fa22f8 | 3345 | return ret; |
ab0ee2ca JG |
3346 | } |
3347 | ||
3348 | int handle_notification_thread_client_connect( | |
3349 | struct notification_thread_state *state) | |
3350 | { | |
3351 | int ret; | |
3352 | struct notification_client *client; | |
3353 | ||
bd0514a5 | 3354 | DBG("Handling new notification channel client connection"); |
ab0ee2ca | 3355 | |
64803277 | 3356 | client = zmalloc<notification_client>(); |
ab0ee2ca JG |
3357 | if (!client) { |
3358 | /* Fatal error. */ | |
3359 | ret = -1; | |
3360 | goto error; | |
3361 | } | |
6c24d3fd | 3362 | |
505b2d90 | 3363 | pthread_mutex_init(&client->lock, NULL); |
ac1889bf | 3364 | client->id = state->next_notification_client_id++; |
ab0ee2ca | 3365 | CDS_INIT_LIST_HEAD(&client->condition_list); |
882093ee JR |
3366 | lttng_payload_init(&client->communication.inbound.payload); |
3367 | lttng_payload_init(&client->communication.outbound.payload); | |
01ea340e | 3368 | client->communication.inbound.expect_creds = true; |
505b2d90 | 3369 | |
14fa22f8 JG |
3370 | ret = client_reset_inbound_state(client); |
3371 | if (ret) { | |
bd0514a5 | 3372 | ERR("Failed to reset client communication's inbound state"); |
e742b055 | 3373 | ret = 0; |
14fa22f8 JG |
3374 | goto error; |
3375 | } | |
ab0ee2ca JG |
3376 | |
3377 | ret = lttcomm_accept_unix_sock(state->notification_channel_socket); | |
3378 | if (ret < 0) { | |
bd0514a5 | 3379 | ERR("Failed to accept new notification channel client connection"); |
ab0ee2ca JG |
3380 | ret = 0; |
3381 | goto error; | |
3382 | } | |
3383 | ||
3384 | client->socket = ret; | |
3385 | ||
3386 | ret = socket_set_non_blocking(client->socket); | |
3387 | if (ret) { | |
bd0514a5 | 3388 | ERR("Failed to set new notification channel client connection socket as non-blocking"); |
ab0ee2ca JG |
3389 | goto error; |
3390 | } | |
3391 | ||
3392 | ret = lttcomm_setsockopt_creds_unix_sock(client->socket); | |
3393 | if (ret < 0) { | |
bd0514a5 | 3394 | ERR("Failed to set socket options on new notification channel client socket"); |
ab0ee2ca JG |
3395 | ret = 0; |
3396 | goto error; | |
3397 | } | |
3398 | ||
9016dbfc | 3399 | client->communication.current_poll_events = CLIENT_POLL_EVENTS_IN; |
ab0ee2ca | 3400 | ret = lttng_poll_add(&state->events, client->socket, |
9016dbfc | 3401 | client->communication.current_poll_events); |
ab0ee2ca | 3402 | if (ret < 0) { |
bd0514a5 | 3403 | ERR("Failed to add notification channel client socket to poll set"); |
ab0ee2ca JG |
3404 | ret = 0; |
3405 | goto error; | |
3406 | } | |
bd0514a5 | 3407 | DBG("Added new notification channel client socket (%i) to poll set", |
ab0ee2ca JG |
3408 | client->socket); |
3409 | ||
ab0ee2ca JG |
3410 | rcu_read_lock(); |
3411 | cds_lfht_add(state->client_socket_ht, | |
3412 | hash_client_socket(client->socket), | |
3413 | &client->client_socket_ht_node); | |
ac1889bf JG |
3414 | cds_lfht_add(state->client_id_ht, |
3415 | hash_client_id(client->id), | |
3416 | &client->client_id_ht_node); | |
ab0ee2ca JG |
3417 | rcu_read_unlock(); |
3418 | ||
3419 | return ret; | |
6c24d3fd | 3420 | |
ab0ee2ca | 3421 | error: |
f46376a1 | 3422 | notification_client_destroy(client); |
ab0ee2ca JG |
3423 | return ret; |
3424 | } | |
3425 | ||
6c24d3fd JG |
3426 | /* |
3427 | * RCU read-lock must be held by the caller. | |
3428 | * Client lock must _not_ be held by the caller. | |
3429 | */ | |
505b2d90 JG |
3430 | static |
3431 | int notification_thread_client_disconnect( | |
3432 | struct notification_client *client, | |
ab0ee2ca | 3433 | struct notification_thread_state *state) |
505b2d90 JG |
3434 | { |
3435 | int ret; | |
3436 | struct lttng_condition_list_element *condition_list_element, *tmp; | |
3437 | ||
48b7cdc2 FD |
3438 | ASSERT_RCU_READ_LOCKED(); |
3439 | ||
505b2d90 | 3440 | /* Acquire the client lock to disable its communication atomically. */ |
6c24d3fd | 3441 | pthread_mutex_lock(&client->lock); |
505b2d90 | 3442 | client->communication.active = false; |
6c24d3fd JG |
3443 | cds_lfht_del(state->client_socket_ht, &client->client_socket_ht_node); |
3444 | cds_lfht_del(state->client_id_ht, &client->client_id_ht_node); | |
3445 | pthread_mutex_unlock(&client->lock); | |
3446 | ||
505b2d90 JG |
3447 | ret = lttng_poll_del(&state->events, client->socket); |
3448 | if (ret) { | |
bd0514a5 | 3449 | ERR("Failed to remove client socket %d from poll set", |
505b2d90 JG |
3450 | client->socket); |
3451 | } | |
3452 | ||
505b2d90 JG |
3453 | /* Release all conditions to which the client was subscribed. */ |
3454 | cds_list_for_each_entry_safe(condition_list_element, tmp, | |
3455 | &client->condition_list, node) { | |
3456 | (void) notification_thread_client_unsubscribe(client, | |
3457 | condition_list_element->condition, state, NULL); | |
3458 | } | |
3459 | ||
3460 | /* | |
3461 | * Client no longer accessible to other threads (through the | |
3462 | * client lists). | |
3463 | */ | |
f46376a1 | 3464 | notification_client_destroy(client); |
505b2d90 JG |
3465 | return ret; |
3466 | } | |
3467 | ||
3468 | int handle_notification_thread_client_disconnect( | |
3469 | int client_socket, struct notification_thread_state *state) | |
ab0ee2ca JG |
3470 | { |
3471 | int ret = 0; | |
3472 | struct notification_client *client; | |
3473 | ||
3474 | rcu_read_lock(); | |
bd0514a5 | 3475 | DBG("Closing client connection (socket fd = %i)", |
ab0ee2ca JG |
3476 | client_socket); |
3477 | client = get_client_from_socket(client_socket, state); | |
3478 | if (!client) { | |
3479 | /* Internal state corruption, fatal error. */ | |
bd0514a5 | 3480 | ERR("Unable to find client (socket fd = %i)", |
ab0ee2ca JG |
3481 | client_socket); |
3482 | ret = -1; | |
3483 | goto end; | |
3484 | } | |
3485 | ||
505b2d90 | 3486 | ret = notification_thread_client_disconnect(client, state); |
ab0ee2ca JG |
3487 | end: |
3488 | rcu_read_unlock(); | |
3489 | return ret; | |
3490 | } | |
3491 | ||
3492 | int handle_notification_thread_client_disconnect_all( | |
3493 | struct notification_thread_state *state) | |
3494 | { | |
3495 | struct cds_lfht_iter iter; | |
3496 | struct notification_client *client; | |
3497 | bool error_encoutered = false; | |
3498 | ||
3499 | rcu_read_lock(); | |
bd0514a5 | 3500 | DBG("Closing all client connections"); |
ab0ee2ca | 3501 | cds_lfht_for_each_entry(state->client_socket_ht, &iter, client, |
505b2d90 | 3502 | client_socket_ht_node) { |
ab0ee2ca JG |
3503 | int ret; |
3504 | ||
505b2d90 JG |
3505 | ret = notification_thread_client_disconnect( |
3506 | client, state); | |
ab0ee2ca JG |
3507 | if (ret) { |
3508 | error_encoutered = true; | |
3509 | } | |
3510 | } | |
3511 | rcu_read_unlock(); | |
3512 | return error_encoutered ? 1 : 0; | |
3513 | } | |
3514 | ||
3515 | int handle_notification_thread_trigger_unregister_all( | |
3516 | struct notification_thread_state *state) | |
3517 | { | |
4149ace8 | 3518 | bool error_occurred = false; |
ab0ee2ca JG |
3519 | struct cds_lfht_iter iter; |
3520 | struct lttng_trigger_ht_element *trigger_ht_element; | |
3521 | ||
763de384 | 3522 | rcu_read_lock(); |
ab0ee2ca JG |
3523 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, |
3524 | node) { | |
3525 | int ret = handle_notification_thread_command_unregister_trigger( | |
3526 | state, trigger_ht_element->trigger, NULL); | |
3527 | if (ret) { | |
4149ace8 | 3528 | error_occurred = true; |
ab0ee2ca JG |
3529 | } |
3530 | } | |
763de384 | 3531 | rcu_read_unlock(); |
4149ace8 | 3532 | return error_occurred ? -1 : 0; |
ab0ee2ca JG |
3533 | } |
3534 | ||
9016dbfc JG |
3535 | static |
3536 | bool client_has_outbound_data_left( | |
3537 | const struct notification_client *client) | |
3538 | { | |
3539 | const struct lttng_payload_view pv = lttng_payload_view_from_payload( | |
3540 | &client->communication.outbound.payload, 0, -1); | |
3541 | const bool has_data = pv.buffer.size != 0; | |
3542 | const bool has_fds = lttng_payload_view_get_fd_handle_count(&pv); | |
3543 | ||
3544 | return has_data || has_fds; | |
3545 | } | |
3546 | ||
dd877ea6 JG |
3547 | static |
3548 | int client_handle_transmission_status( | |
3549 | struct notification_client *client, | |
3550 | enum client_transmission_status transmission_status, | |
3551 | struct notification_thread_state *state) | |
3552 | { | |
3553 | int ret = 0; | |
3554 | ||
3555 | switch (transmission_status) { | |
3556 | case CLIENT_TRANSMISSION_STATUS_COMPLETE: | |
dd877ea6 | 3557 | case CLIENT_TRANSMISSION_STATUS_QUEUED: |
9016dbfc JG |
3558 | { |
3559 | int current_poll_events; | |
3560 | int new_poll_events; | |
dd877ea6 JG |
3561 | /* |
3562 | * We want to be notified whenever there is buffer space | |
9016dbfc JG |
3563 | * available to send the rest of the payload if we are |
3564 | * waiting to send data to the client. | |
3565 | * | |
3566 | * The state of the outbound queue being sampled here is | |
3567 | * fine since: | |
3568 | * - it is okay to wake-up "for nothing" in case we see | |
3569 | * that data is left, but another thread succeeds in | |
3570 | * flushing it before us when handling the client "out" | |
3571 | * event. We will simply stop monitoring that event the next | |
3572 | * time it wakes us up and we see no data left to be sent, | |
3573 | * - if another thread fails to flush the entire client | |
3574 | * outgoing queue, it will issue a "communication update" | |
3575 | * command and cause the client's (e)poll mask to be | |
3576 | * re-evaluated. | |
3577 | * | |
3578 | * The situation we seek to avoid would be to disable the | |
3579 | * monitoring of "out" client events indefinitely when there is | |
3580 | * data to be sent, which can't happen because of the | |
3581 | * aforementioned "communication update" mechanism. | |
dd877ea6 | 3582 | */ |
9016dbfc JG |
3583 | pthread_mutex_lock(&client->lock); |
3584 | current_poll_events = client->communication.current_poll_events; | |
3585 | new_poll_events = client_has_outbound_data_left(client) ? | |
3586 | CLIENT_POLL_EVENTS_IN_OUT : | |
3587 | CLIENT_POLL_EVENTS_IN; | |
3588 | client->communication.current_poll_events = new_poll_events; | |
3589 | pthread_mutex_unlock(&client->lock); | |
3590 | ||
3591 | /* Update the monitored event set only if it changed. */ | |
3592 | if (current_poll_events != new_poll_events) { | |
3593 | ret = lttng_poll_mod(&state->events, client->socket, | |
3594 | new_poll_events); | |
3595 | if (ret) { | |
3596 | goto end; | |
3597 | } | |
dd877ea6 | 3598 | } |
9016dbfc | 3599 | |
dd877ea6 | 3600 | break; |
9016dbfc | 3601 | } |
dd877ea6 JG |
3602 | case CLIENT_TRANSMISSION_STATUS_FAIL: |
3603 | ret = notification_thread_client_disconnect(client, state); | |
3604 | if (ret) { | |
3605 | goto end; | |
3606 | } | |
3607 | break; | |
3608 | case CLIENT_TRANSMISSION_STATUS_ERROR: | |
3609 | ret = -1; | |
3610 | goto end; | |
3611 | default: | |
3612 | abort(); | |
3613 | } | |
3614 | end: | |
3615 | return ret; | |
3616 | } | |
3617 | ||
505b2d90 | 3618 | /* Client lock must be acquired by caller. */ |
ab0ee2ca | 3619 | static |
dd877ea6 | 3620 | enum client_transmission_status client_flush_outgoing_queue( |
f2b3ef9f | 3621 | struct notification_client *client) |
ab0ee2ca JG |
3622 | { |
3623 | ssize_t ret; | |
3624 | size_t to_send_count; | |
dd877ea6 | 3625 | enum client_transmission_status status; |
882093ee JR |
3626 | struct lttng_payload_view pv = lttng_payload_view_from_payload( |
3627 | &client->communication.outbound.payload, 0, -1); | |
3628 | const int fds_to_send_count = | |
3629 | lttng_payload_view_get_fd_handle_count(&pv); | |
ab0ee2ca | 3630 | |
505b2d90 JG |
3631 | ASSERT_LOCKED(client->lock); |
3632 | ||
f2b3ef9f JG |
3633 | if (!client->communication.active) { |
3634 | status = CLIENT_TRANSMISSION_STATUS_FAIL; | |
3635 | goto end; | |
3636 | } | |
3637 | ||
882093ee JR |
3638 | if (pv.buffer.size == 0) { |
3639 | /* | |
3640 | * If both data and fds are equal to zero, we are in an invalid | |
3641 | * state. | |
3642 | */ | |
a0377dfe | 3643 | LTTNG_ASSERT(fds_to_send_count != 0); |
882093ee JR |
3644 | goto send_fds; |
3645 | } | |
3646 | ||
3647 | /* Send data. */ | |
3648 | to_send_count = pv.buffer.size; | |
bd0514a5 | 3649 | DBG("Flushing client (socket fd = %i) outgoing queue", |
ab0ee2ca JG |
3650 | client->socket); |
3651 | ||
3652 | ret = lttcomm_send_unix_sock_non_block(client->socket, | |
882093ee | 3653 | pv.buffer.data, |
ab0ee2ca | 3654 | to_send_count); |
44c180ca | 3655 | if ((ret >= 0 && ret < to_send_count)) { |
bd0514a5 | 3656 | DBG("Client (socket fd = %i) outgoing queue could not be completely flushed", |
ab0ee2ca | 3657 | client->socket); |
7966af57 | 3658 | to_send_count -= std::max(ret, (ssize_t) 0); |
ab0ee2ca | 3659 | |
6f110534 | 3660 | memmove(client->communication.outbound.payload.buffer.data, |
882093ee JR |
3661 | pv.buffer.data + |
3662 | pv.buffer.size - to_send_count, | |
ab0ee2ca JG |
3663 | to_send_count); |
3664 | ret = lttng_dynamic_buffer_set_size( | |
882093ee | 3665 | &client->communication.outbound.payload.buffer, |
ab0ee2ca JG |
3666 | to_send_count); |
3667 | if (ret) { | |
3668 | goto error; | |
3669 | } | |
6c24d3fd | 3670 | |
dd877ea6 | 3671 | status = CLIENT_TRANSMISSION_STATUS_QUEUED; |
882093ee | 3672 | goto end; |
ab0ee2ca | 3673 | } else if (ret < 0) { |
6c24d3fd | 3674 | /* Generic error, disable the client's communication. */ |
bd0514a5 | 3675 | ERR("Failed to flush outgoing queue, disconnecting client (socket fd = %i)", |
ab0ee2ca | 3676 | client->socket); |
6c24d3fd | 3677 | client->communication.active = false; |
dd877ea6 | 3678 | status = CLIENT_TRANSMISSION_STATUS_FAIL; |
882093ee | 3679 | goto end; |
ab0ee2ca | 3680 | } else { |
882093ee JR |
3681 | /* |
3682 | * No error and flushed the queue completely. | |
3683 | * | |
3684 | * The payload buffer size is used later to | |
3685 | * check if there is notifications queued. So albeit that the | |
3686 | * direct caller knows that the transmission is complete, we | |
3687 | * need to set the buffer size to zero. | |
3688 | */ | |
ab0ee2ca | 3689 | ret = lttng_dynamic_buffer_set_size( |
882093ee | 3690 | &client->communication.outbound.payload.buffer, 0); |
ab0ee2ca JG |
3691 | if (ret) { |
3692 | goto error; | |
3693 | } | |
882093ee | 3694 | } |
6c24d3fd | 3695 | |
882093ee JR |
3696 | send_fds: |
3697 | /* No fds to send, transmission is complete. */ | |
3698 | if (fds_to_send_count == 0) { | |
dd877ea6 | 3699 | status = CLIENT_TRANSMISSION_STATUS_COMPLETE; |
882093ee | 3700 | goto end; |
dd877ea6 | 3701 | } |
882093ee JR |
3702 | |
3703 | ret = lttcomm_send_payload_view_fds_unix_sock_non_block( | |
3704 | client->socket, &pv); | |
3705 | if (ret < 0) { | |
3706 | /* Generic error, disable the client's communication. */ | |
bd0514a5 | 3707 | ERR("Failed to flush outgoing fds queue, disconnecting client (socket fd = %i)", |
882093ee JR |
3708 | client->socket); |
3709 | client->communication.active = false; | |
3710 | status = CLIENT_TRANSMISSION_STATUS_FAIL; | |
3711 | goto end; | |
3712 | } else if (ret == 0) { | |
3713 | /* Nothing could be sent. */ | |
3714 | status = CLIENT_TRANSMISSION_STATUS_QUEUED; | |
3715 | } else { | |
3716 | /* Fd passing is an all or nothing kind of thing. */ | |
3717 | status = CLIENT_TRANSMISSION_STATUS_COMPLETE; | |
3718 | /* | |
3719 | * The payload _fd_array count is used later to | |
3720 | * check if there is notifications queued. So although the | |
3721 | * direct caller knows that the transmission is complete, we | |
3722 | * need to clear the _fd_array for the queuing check. | |
3723 | */ | |
3724 | lttng_dynamic_pointer_array_clear( | |
3725 | &client->communication.outbound.payload | |
3726 | ._fd_handles); | |
3727 | } | |
3728 | ||
f2b3ef9f | 3729 | end: |
882093ee JR |
3730 | if (status == CLIENT_TRANSMISSION_STATUS_COMPLETE) { |
3731 | client->communication.outbound.queued_command_reply = false; | |
3732 | client->communication.outbound.dropped_notification = false; | |
3733 | lttng_payload_clear(&client->communication.outbound.payload); | |
3734 | } | |
3735 | ||
f2b3ef9f | 3736 | return status; |
ab0ee2ca | 3737 | error: |
f2b3ef9f | 3738 | return CLIENT_TRANSMISSION_STATUS_ERROR; |
ab0ee2ca JG |
3739 | } |
3740 | ||
6c24d3fd | 3741 | /* Client lock must _not_ be held by the caller. */ |
ab0ee2ca JG |
3742 | static |
3743 | int client_send_command_reply(struct notification_client *client, | |
3744 | struct notification_thread_state *state, | |
3745 | enum lttng_notification_channel_status status) | |
3746 | { | |
3747 | int ret; | |
3748 | struct lttng_notification_channel_command_reply reply = { | |
3749 | .status = (int8_t) status, | |
3750 | }; | |
6bd79809 | 3751 | struct lttng_notification_channel_message msg; |
ab0ee2ca | 3752 | char buffer[sizeof(msg) + sizeof(reply)]; |
f2b3ef9f | 3753 | enum client_transmission_status transmission_status; |
ab0ee2ca | 3754 | |
6bd79809 JG |
3755 | msg.type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_COMMAND_REPLY; |
3756 | msg.size = sizeof(reply); | |
3757 | msg.fds = 0; | |
3758 | ||
6c24d3fd JG |
3759 | memcpy(buffer, &msg, sizeof(msg)); |
3760 | memcpy(buffer + sizeof(msg), &reply, sizeof(reply)); | |
bd0514a5 | 3761 | DBG("Send command reply (%i)", (int) status); |
505b2d90 | 3762 | |
6c24d3fd | 3763 | pthread_mutex_lock(&client->lock); |
ab0ee2ca JG |
3764 | if (client->communication.outbound.queued_command_reply) { |
3765 | /* Protocol error. */ | |
6c24d3fd | 3766 | goto error_unlock; |
ab0ee2ca JG |
3767 | } |
3768 | ||
ab0ee2ca JG |
3769 | /* Enqueue buffer to outgoing queue and flush it. */ |
3770 | ret = lttng_dynamic_buffer_append( | |
882093ee | 3771 | &client->communication.outbound.payload.buffer, |
ab0ee2ca JG |
3772 | buffer, sizeof(buffer)); |
3773 | if (ret) { | |
6c24d3fd | 3774 | goto error_unlock; |
ab0ee2ca JG |
3775 | } |
3776 | ||
f2b3ef9f | 3777 | transmission_status = client_flush_outgoing_queue(client); |
882093ee JR |
3778 | |
3779 | if (client_has_outbound_data_left(client)) { | |
6c24d3fd JG |
3780 | /* Queue could not be emptied. */ |
3781 | client->communication.outbound.queued_command_reply = true; | |
3782 | } | |
3783 | ||
3784 | pthread_mutex_unlock(&client->lock); | |
f2b3ef9f JG |
3785 | ret = client_handle_transmission_status( |
3786 | client, transmission_status, state); | |
ab0ee2ca JG |
3787 | if (ret) { |
3788 | goto error; | |
3789 | } | |
3790 | ||
ab0ee2ca | 3791 | return 0; |
6c24d3fd JG |
3792 | error_unlock: |
3793 | pthread_mutex_unlock(&client->lock); | |
ab0ee2ca JG |
3794 | error: |
3795 | return -1; | |
3796 | } | |
3797 | ||
505b2d90 JG |
3798 | static |
3799 | int client_handle_message_unknown(struct notification_client *client, | |
f46376a1 | 3800 | struct notification_thread_state *state __attribute__((unused))) |
505b2d90 JG |
3801 | { |
3802 | int ret; | |
505b2d90 JG |
3803 | /* |
3804 | * Receiving message header. The function will be called again | |
3805 | * once the rest of the message as been received and can be | |
3806 | * interpreted. | |
3807 | */ | |
3808 | const struct lttng_notification_channel_message *msg; | |
3809 | ||
a0377dfe | 3810 | LTTNG_ASSERT(sizeof(*msg) == client->communication.inbound.payload.buffer.size); |
505b2d90 | 3811 | msg = (const struct lttng_notification_channel_message *) |
882093ee | 3812 | client->communication.inbound.payload.buffer.data; |
505b2d90 JG |
3813 | |
3814 | if (msg->size == 0 || | |
3815 | msg->size > DEFAULT_MAX_NOTIFICATION_CLIENT_MESSAGE_PAYLOAD_SIZE) { | |
bd0514a5 | 3816 | ERR("Invalid notification channel message: length = %u", |
505b2d90 JG |
3817 | msg->size); |
3818 | ret = -1; | |
3819 | goto end; | |
3820 | } | |
3821 | ||
3822 | switch (msg->type) { | |
3823 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE: | |
3824 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNSUBSCRIBE: | |
3825 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE: | |
3826 | break; | |
3827 | default: | |
3828 | ret = -1; | |
bd0514a5 | 3829 | ERR("Invalid notification channel message: unexpected message type"); |
505b2d90 JG |
3830 | goto end; |
3831 | } | |
3832 | ||
3833 | client->communication.inbound.bytes_to_receive = msg->size; | |
882093ee | 3834 | client->communication.inbound.fds_to_receive = msg->fds; |
505b2d90 JG |
3835 | client->communication.inbound.msg_type = |
3836 | (enum lttng_notification_channel_message_type) msg->type; | |
3837 | ret = lttng_dynamic_buffer_set_size( | |
882093ee JR |
3838 | &client->communication.inbound.payload.buffer, msg->size); |
3839 | ||
3840 | /* msg is not valid anymore due to lttng_dynamic_buffer_set_size. */ | |
3841 | msg = NULL; | |
505b2d90 | 3842 | end: |
505b2d90 JG |
3843 | return ret; |
3844 | } | |
3845 | ||
3846 | static | |
3847 | int client_handle_message_handshake(struct notification_client *client, | |
3848 | struct notification_thread_state *state) | |
3849 | { | |
3850 | int ret; | |
3851 | struct lttng_notification_channel_command_handshake *handshake_client; | |
3852 | const struct lttng_notification_channel_command_handshake handshake_reply = { | |
3853 | .major = LTTNG_NOTIFICATION_CHANNEL_VERSION_MAJOR, | |
3854 | .minor = LTTNG_NOTIFICATION_CHANNEL_VERSION_MINOR, | |
3855 | }; | |
6bd79809 | 3856 | struct lttng_notification_channel_message msg_header; |
505b2d90 JG |
3857 | enum lttng_notification_channel_status status = |
3858 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
3859 | char send_buffer[sizeof(msg_header) + sizeof(handshake_reply)]; | |
505b2d90 | 3860 | |
6bd79809 JG |
3861 | msg_header.type = LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE; |
3862 | msg_header.size = sizeof(handshake_reply); | |
3863 | msg_header.fds = 0; | |
3864 | ||
505b2d90 JG |
3865 | memcpy(send_buffer, &msg_header, sizeof(msg_header)); |
3866 | memcpy(send_buffer + sizeof(msg_header), &handshake_reply, | |
3867 | sizeof(handshake_reply)); | |
3868 | ||
3869 | handshake_client = | |
3870 | (struct lttng_notification_channel_command_handshake *) | |
882093ee | 3871 | client->communication.inbound.payload.buffer |
505b2d90 JG |
3872 | .data; |
3873 | client->major = handshake_client->major; | |
3874 | client->minor = handshake_client->minor; | |
3875 | if (!client->communication.inbound.creds_received) { | |
bd0514a5 | 3876 | ERR("No credentials received from client"); |
505b2d90 JG |
3877 | ret = -1; |
3878 | goto end; | |
3879 | } | |
3880 | ||
3881 | client->uid = LTTNG_SOCK_GET_UID_CRED( | |
3882 | &client->communication.inbound.creds); | |
3883 | client->gid = LTTNG_SOCK_GET_GID_CRED( | |
3884 | &client->communication.inbound.creds); | |
f2bda80e JG |
3885 | client->is_sessiond = LTTNG_SOCK_GET_PID_CRED(&client->communication.inbound.creds) == getpid(); |
3886 | DBG("Received handshake from client: uid = %u, gid = %u, protocol version = %i.%i, client is sessiond = %s", | |
505b2d90 | 3887 | client->uid, client->gid, (int) client->major, |
f2bda80e JG |
3888 | (int) client->minor, |
3889 | client->is_sessiond ? "true" : "false"); | |
505b2d90 JG |
3890 | |
3891 | if (handshake_client->major != | |
3892 | LTTNG_NOTIFICATION_CHANNEL_VERSION_MAJOR) { | |
3893 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_UNSUPPORTED_VERSION; | |
3894 | } | |
3895 | ||
6c24d3fd JG |
3896 | pthread_mutex_lock(&client->lock); |
3897 | /* Outgoing queue will be flushed when the command reply is sent. */ | |
505b2d90 | 3898 | ret = lttng_dynamic_buffer_append( |
882093ee | 3899 | &client->communication.outbound.payload.buffer, send_buffer, |
505b2d90 JG |
3900 | sizeof(send_buffer)); |
3901 | if (ret) { | |
bd0514a5 | 3902 | ERR("Failed to send protocol version to notification channel client"); |
6c24d3fd | 3903 | goto end_unlock; |
505b2d90 JG |
3904 | } |
3905 | ||
3906 | client->validated = true; | |
3907 | client->communication.active = true; | |
6c24d3fd | 3908 | pthread_mutex_unlock(&client->lock); |
505b2d90 | 3909 | |
6c24d3fd JG |
3910 | /* Set reception state to receive the next message header. */ |
3911 | ret = client_reset_inbound_state(client); | |
505b2d90 | 3912 | if (ret) { |
bd0514a5 | 3913 | ERR("Failed to reset client communication's inbound state"); |
505b2d90 JG |
3914 | goto end; |
3915 | } | |
3916 | ||
6c24d3fd | 3917 | /* Flushes the outgoing queue. */ |
505b2d90 JG |
3918 | ret = client_send_command_reply(client, state, status); |
3919 | if (ret) { | |
bd0514a5 | 3920 | ERR("Failed to send reply to notification channel client"); |
505b2d90 JG |
3921 | goto end; |
3922 | } | |
3923 | ||
6c24d3fd JG |
3924 | goto end; |
3925 | end_unlock: | |
505b2d90 | 3926 | pthread_mutex_unlock(&client->lock); |
6c24d3fd | 3927 | end: |
505b2d90 JG |
3928 | return ret; |
3929 | } | |
3930 | ||
3931 | static | |
3932 | int client_handle_message_subscription( | |
3933 | struct notification_client *client, | |
3934 | enum lttng_notification_channel_message_type msg_type, | |
3935 | struct notification_thread_state *state) | |
3936 | { | |
3937 | int ret; | |
3938 | struct lttng_condition *condition; | |
3939 | enum lttng_notification_channel_status status = | |
3940 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
3941 | struct lttng_payload_view condition_view = | |
882093ee JR |
3942 | lttng_payload_view_from_payload( |
3943 | &client->communication.inbound.payload, | |
505b2d90 JG |
3944 | 0, -1); |
3945 | size_t expected_condition_size; | |
3946 | ||
6c24d3fd JG |
3947 | /* |
3948 | * No need to lock client to sample the inbound state as the only | |
3949 | * other thread accessing clients (action executor) only uses the | |
3950 | * outbound state. | |
3951 | */ | |
882093ee | 3952 | expected_condition_size = client->communication.inbound.payload.buffer.size; |
505b2d90 JG |
3953 | ret = lttng_condition_create_from_payload(&condition_view, &condition); |
3954 | if (ret != expected_condition_size) { | |
bd0514a5 | 3955 | ERR("Malformed condition received from client"); |
505b2d90 JG |
3956 | goto end; |
3957 | } | |
3958 | ||
5a6306f7 | 3959 | /* Ownership of condition is always transferred. */ |
505b2d90 JG |
3960 | if (msg_type == LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE) { |
3961 | ret = notification_thread_client_subscribe( | |
3962 | client, condition, state, &status); | |
3963 | } else { | |
3964 | ret = notification_thread_client_unsubscribe( | |
3965 | client, condition, state, &status); | |
3966 | } | |
505b2d90 | 3967 | |
505b2d90 | 3968 | if (ret) { |
6c24d3fd | 3969 | goto end; |
505b2d90 JG |
3970 | } |
3971 | ||
3972 | /* Set reception state to receive the next message header. */ | |
3973 | ret = client_reset_inbound_state(client); | |
3974 | if (ret) { | |
bd0514a5 | 3975 | ERR("Failed to reset client communication's inbound state"); |
6c24d3fd JG |
3976 | goto end; |
3977 | } | |
3978 | ||
3979 | ret = client_send_command_reply(client, state, status); | |
3980 | if (ret) { | |
bd0514a5 | 3981 | ERR("Failed to send reply to notification channel client"); |
6c24d3fd | 3982 | goto end; |
505b2d90 JG |
3983 | } |
3984 | ||
505b2d90 JG |
3985 | end: |
3986 | return ret; | |
3987 | } | |
3988 | ||
ab0ee2ca JG |
3989 | static |
3990 | int client_dispatch_message(struct notification_client *client, | |
3991 | struct notification_thread_state *state) | |
3992 | { | |
3993 | int ret = 0; | |
3994 | ||
3995 | if (client->communication.inbound.msg_type != | |
3996 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE && | |
3997 | client->communication.inbound.msg_type != | |
3998 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN && | |
3999 | !client->validated) { | |
bd0514a5 | 4000 | WARN("client attempted a command before handshake"); |
ab0ee2ca JG |
4001 | ret = -1; |
4002 | goto end; | |
4003 | } | |
4004 | ||
4005 | switch (client->communication.inbound.msg_type) { | |
4006 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN: | |
4007 | { | |
505b2d90 | 4008 | ret = client_handle_message_unknown(client, state); |
ab0ee2ca JG |
4009 | break; |
4010 | } | |
4011 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE: | |
4012 | { | |
505b2d90 | 4013 | ret = client_handle_message_handshake(client, state); |
ab0ee2ca JG |
4014 | break; |
4015 | } | |
4016 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE: | |
4017 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNSUBSCRIBE: | |
4018 | { | |
505b2d90 JG |
4019 | ret = client_handle_message_subscription(client, |
4020 | client->communication.inbound.msg_type, state); | |
ab0ee2ca JG |
4021 | break; |
4022 | } | |
4023 | default: | |
4024 | abort(); | |
4025 | } | |
4026 | end: | |
4027 | return ret; | |
4028 | } | |
4029 | ||
4030 | /* Incoming data from client. */ | |
4031 | int handle_notification_thread_client_in( | |
4032 | struct notification_thread_state *state, int socket) | |
4033 | { | |
14fa22f8 | 4034 | int ret = 0; |
ab0ee2ca JG |
4035 | struct notification_client *client; |
4036 | ssize_t recv_ret; | |
4037 | size_t offset; | |
4038 | ||
98b5ff34 | 4039 | rcu_read_lock(); |
ab0ee2ca JG |
4040 | client = get_client_from_socket(socket, state); |
4041 | if (!client) { | |
4042 | /* Internal error, abort. */ | |
4043 | ret = -1; | |
4044 | goto end; | |
4045 | } | |
4046 | ||
982583bd JR |
4047 | if (client->communication.inbound.bytes_to_receive == 0 && |
4048 | client->communication.inbound.fds_to_receive != 0) { | |
4049 | /* Only FDs left to receive. */ | |
4050 | goto receive_fds; | |
4051 | } | |
4052 | ||
882093ee | 4053 | offset = client->communication.inbound.payload.buffer.size - |
14fa22f8 | 4054 | client->communication.inbound.bytes_to_receive; |
01ea340e | 4055 | if (client->communication.inbound.expect_creds) { |
ab0ee2ca | 4056 | recv_ret = lttcomm_recv_creds_unix_sock(socket, |
882093ee | 4057 | client->communication.inbound.payload.buffer.data + offset, |
ab0ee2ca JG |
4058 | client->communication.inbound.bytes_to_receive, |
4059 | &client->communication.inbound.creds); | |
4060 | if (recv_ret > 0) { | |
01ea340e | 4061 | client->communication.inbound.expect_creds = false; |
ab0ee2ca JG |
4062 | client->communication.inbound.creds_received = true; |
4063 | } | |
4064 | } else { | |
4065 | recv_ret = lttcomm_recv_unix_sock_non_block(socket, | |
882093ee | 4066 | client->communication.inbound.payload.buffer.data + offset, |
ab0ee2ca JG |
4067 | client->communication.inbound.bytes_to_receive); |
4068 | } | |
505b2d90 JG |
4069 | if (recv_ret >= 0) { |
4070 | client->communication.inbound.bytes_to_receive -= recv_ret; | |
882093ee JR |
4071 | } else { |
4072 | goto error_disconnect_client; | |
505b2d90 | 4073 | } |
6c24d3fd | 4074 | |
882093ee JR |
4075 | if (client->communication.inbound.bytes_to_receive != 0) { |
4076 | /* Message incomplete wait for more data. */ | |
4077 | ret = 0; | |
4078 | goto end; | |
ab0ee2ca JG |
4079 | } |
4080 | ||
982583bd | 4081 | receive_fds: |
a0377dfe | 4082 | LTTNG_ASSERT(client->communication.inbound.bytes_to_receive == 0); |
882093ee JR |
4083 | |
4084 | /* Receive fds. */ | |
4085 | if (client->communication.inbound.fds_to_receive != 0) { | |
4086 | ret = lttcomm_recv_payload_fds_unix_sock_non_block( | |
4087 | client->socket, | |
4088 | client->communication.inbound.fds_to_receive, | |
4089 | &client->communication.inbound.payload); | |
4090 | if (ret > 0) { | |
ab0ee2ca | 4091 | /* |
882093ee JR |
4092 | * Fds received. non blocking fds passing is all |
4093 | * or nothing. | |
ab0ee2ca | 4094 | */ |
882093ee JR |
4095 | ssize_t expected_size; |
4096 | ||
4097 | expected_size = sizeof(int) * | |
4098 | client->communication.inbound | |
4099 | .fds_to_receive; | |
a0377dfe | 4100 | LTTNG_ASSERT(ret == expected_size); |
882093ee JR |
4101 | client->communication.inbound.fds_to_receive = 0; |
4102 | } else if (ret == 0) { | |
4103 | /* Received nothing. */ | |
4104 | ret = 0; | |
4105 | goto end; | |
4106 | } else { | |
ab0ee2ca JG |
4107 | goto error_disconnect_client; |
4108 | } | |
ab0ee2ca | 4109 | } |
882093ee JR |
4110 | |
4111 | /* At this point the message is complete.*/ | |
a0377dfe | 4112 | LTTNG_ASSERT(client->communication.inbound.bytes_to_receive == 0 && |
882093ee JR |
4113 | client->communication.inbound.fds_to_receive == 0); |
4114 | ret = client_dispatch_message(client, state); | |
4115 | if (ret) { | |
4116 | /* | |
4117 | * Only returns an error if this client must be | |
4118 | * disconnected. | |
4119 | */ | |
4120 | goto error_disconnect_client; | |
4121 | } | |
4122 | ||
ab0ee2ca | 4123 | end: |
98b5ff34 | 4124 | rcu_read_unlock(); |
ab0ee2ca | 4125 | return ret; |
882093ee | 4126 | |
ab0ee2ca | 4127 | error_disconnect_client: |
505b2d90 | 4128 | ret = notification_thread_client_disconnect(client, state); |
98b5ff34 | 4129 | goto end; |
ab0ee2ca JG |
4130 | } |
4131 | ||
4132 | /* Client ready to receive outgoing data. */ | |
4133 | int handle_notification_thread_client_out( | |
4134 | struct notification_thread_state *state, int socket) | |
4135 | { | |
4136 | int ret; | |
4137 | struct notification_client *client; | |
f2b3ef9f | 4138 | enum client_transmission_status transmission_status; |
ab0ee2ca | 4139 | |
98b5ff34 | 4140 | rcu_read_lock(); |
ab0ee2ca JG |
4141 | client = get_client_from_socket(socket, state); |
4142 | if (!client) { | |
4143 | /* Internal error, abort. */ | |
4144 | ret = -1; | |
4145 | goto end; | |
4146 | } | |
4147 | ||
505b2d90 | 4148 | pthread_mutex_lock(&client->lock); |
9016dbfc JG |
4149 | if (!client_has_outbound_data_left(client)) { |
4150 | /* | |
4151 | * A client "out" event can be received when no payload is left | |
4152 | * to send under some circumstances. | |
4153 | * | |
4154 | * Many threads can flush a client's outgoing queue and, if they | |
4155 | * had to queue their message (socket was full), will use the | |
4156 | * "communication update" command to signal the (e)poll thread | |
4157 | * to monitor for space being made available in the socket. | |
4158 | * | |
4159 | * Commands are sent over an internal pipe serviced by the same | |
4160 | * thread as the client sockets. | |
4161 | * | |
4162 | * When space is made available in the socket, there is a race | |
4163 | * between the (e)poll thread and the other threads that may | |
4164 | * wish to use the client's socket to flush its outgoing queue. | |
4165 | * | |
4166 | * A non-(e)poll thread may attempt (and succeed) in flushing | |
4167 | * the queue before the (e)poll thread gets a chance to service | |
4168 | * the client's "out" event. | |
4169 | * | |
4170 | * In this situation, the (e)poll thread processing the client | |
4171 | * out event will see an empty payload: there is nothing to do | |
4172 | * except unsubscribing (e)poll "out" events. | |
4173 | * | |
4174 | * Note that this thread is the (e)poll thread so it can modify | |
4175 | * the (e)poll mask directly without using a communication | |
4176 | * update command. Other threads that flush the outgoing queue | |
4177 | * will use the "communication update" command to wake up this | |
4178 | * thread and force it to monitor "out" events. | |
4179 | * | |
4180 | * When other threads succeed in emptying the outgoing queue, | |
4181 | * they don't need to update the (e)poll mask: if the "out" | |
4182 | * event is monitored, it will fire once and the (e)poll | |
4183 | * thread will reach this condition, causing the event to | |
4184 | * stop being monitored. | |
4185 | */ | |
4186 | transmission_status = CLIENT_TRANSMISSION_STATUS_COMPLETE; | |
4187 | } else { | |
4188 | transmission_status = client_flush_outgoing_queue(client); | |
4189 | } | |
6c24d3fd JG |
4190 | pthread_mutex_unlock(&client->lock); |
4191 | ||
f2b3ef9f JG |
4192 | ret = client_handle_transmission_status( |
4193 | client, transmission_status, state); | |
ab0ee2ca JG |
4194 | if (ret) { |
4195 | goto end; | |
4196 | } | |
4197 | end: | |
98b5ff34 | 4198 | rcu_read_unlock(); |
ab0ee2ca JG |
4199 | return ret; |
4200 | } | |
4201 | ||
4202 | static | |
e8360425 JD |
4203 | bool evaluate_buffer_usage_condition(const struct lttng_condition *condition, |
4204 | const struct channel_state_sample *sample, | |
4205 | uint64_t buffer_capacity) | |
ab0ee2ca JG |
4206 | { |
4207 | bool result = false; | |
4208 | uint64_t threshold; | |
4209 | enum lttng_condition_type condition_type; | |
0114db0e JG |
4210 | const struct lttng_condition_buffer_usage *use_condition = lttng::utils::container_of( |
4211 | condition, <tng_condition_buffer_usage::parent); | |
ab0ee2ca | 4212 | |
ab0ee2ca JG |
4213 | if (use_condition->threshold_bytes.set) { |
4214 | threshold = use_condition->threshold_bytes.value; | |
4215 | } else { | |
4216 | /* | |
4217 | * Threshold was expressed as a ratio. | |
4218 | * | |
4219 | * TODO the threshold (in bytes) of conditions expressed | |
4220 | * as a ratio of total buffer size could be cached to | |
4221 | * forego this double-multiplication or it could be performed | |
4222 | * as fixed-point math. | |
4223 | * | |
d49487dc | 4224 | * Note that caching should accommodates the case where the |
ab0ee2ca JG |
4225 | * condition applies to multiple channels (i.e. don't assume |
4226 | * that all channels matching my_chann* have the same size...) | |
4227 | */ | |
4228 | threshold = (uint64_t) (use_condition->threshold_ratio.value * | |
4229 | (double) buffer_capacity); | |
4230 | } | |
4231 | ||
4232 | condition_type = lttng_condition_get_type(condition); | |
4233 | if (condition_type == LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW) { | |
bd0514a5 | 4234 | DBG("Low buffer usage condition being evaluated: threshold = %" PRIu64 ", highest usage = %" PRIu64, |
ab0ee2ca JG |
4235 | threshold, sample->highest_usage); |
4236 | ||
4237 | /* | |
4238 | * The low condition should only be triggered once _all_ of the | |
4239 | * streams in a channel have gone below the "low" threshold. | |
4240 | */ | |
4241 | if (sample->highest_usage <= threshold) { | |
4242 | result = true; | |
4243 | } | |
4244 | } else { | |
bd0514a5 | 4245 | DBG("High buffer usage condition being evaluated: threshold = %" PRIu64 ", highest usage = %" PRIu64, |
ab0ee2ca JG |
4246 | threshold, sample->highest_usage); |
4247 | ||
4248 | /* | |
4249 | * For high buffer usage scenarios, we want to trigger whenever | |
4250 | * _any_ of the streams has reached the "high" threshold. | |
4251 | */ | |
4252 | if (sample->highest_usage >= threshold) { | |
4253 | result = true; | |
4254 | } | |
4255 | } | |
e8360425 | 4256 | |
ab0ee2ca JG |
4257 | return result; |
4258 | } | |
4259 | ||
4260 | static | |
e8360425 JD |
4261 | bool evaluate_session_consumed_size_condition( |
4262 | const struct lttng_condition *condition, | |
4263 | uint64_t session_consumed_size) | |
4264 | { | |
4265 | uint64_t threshold; | |
4266 | const struct lttng_condition_session_consumed_size *size_condition = | |
0114db0e JG |
4267 | lttng::utils::container_of(condition, |
4268 | <tng_condition_session_consumed_size::parent); | |
e8360425 JD |
4269 | |
4270 | threshold = size_condition->consumed_threshold_bytes.value; | |
bd0514a5 | 4271 | DBG("Session consumed size condition being evaluated: threshold = %" PRIu64 ", current size = %" PRIu64, |
e8360425 JD |
4272 | threshold, session_consumed_size); |
4273 | return session_consumed_size >= threshold; | |
4274 | } | |
4275 | ||
4276 | static | |
ed327204 | 4277 | int evaluate_buffer_condition(const struct lttng_condition *condition, |
ab0ee2ca | 4278 | struct lttng_evaluation **evaluation, |
f46376a1 | 4279 | const struct notification_thread_state *state __attribute__((unused)), |
e8360425 JD |
4280 | const struct channel_state_sample *previous_sample, |
4281 | const struct channel_state_sample *latest_sample, | |
4282 | uint64_t previous_session_consumed_total, | |
4283 | uint64_t latest_session_consumed_total, | |
4284 | struct channel_info *channel_info) | |
ab0ee2ca JG |
4285 | { |
4286 | int ret = 0; | |
4287 | enum lttng_condition_type condition_type; | |
e8360425 JD |
4288 | const bool previous_sample_available = !!previous_sample; |
4289 | bool previous_sample_result = false; | |
ab0ee2ca JG |
4290 | bool latest_sample_result; |
4291 | ||
4292 | condition_type = lttng_condition_get_type(condition); | |
ab0ee2ca | 4293 | |
e8360425 JD |
4294 | switch (condition_type) { |
4295 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
4296 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
4297 | if (caa_likely(previous_sample_available)) { | |
4298 | previous_sample_result = | |
4299 | evaluate_buffer_usage_condition(condition, | |
4300 | previous_sample, channel_info->capacity); | |
4301 | } | |
4302 | latest_sample_result = evaluate_buffer_usage_condition( | |
4303 | condition, latest_sample, | |
4304 | channel_info->capacity); | |
4305 | break; | |
4306 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
4307 | if (caa_likely(previous_sample_available)) { | |
4308 | previous_sample_result = | |
4309 | evaluate_session_consumed_size_condition( | |
4310 | condition, | |
4311 | previous_session_consumed_total); | |
4312 | } | |
4313 | latest_sample_result = | |
4314 | evaluate_session_consumed_size_condition( | |
4315 | condition, | |
4316 | latest_session_consumed_total); | |
4317 | break; | |
4318 | default: | |
4319 | /* Unknown condition type; internal error. */ | |
4320 | abort(); | |
4321 | } | |
ab0ee2ca JG |
4322 | |
4323 | if (!latest_sample_result || | |
4324 | (previous_sample_result == latest_sample_result)) { | |
4325 | /* | |
4326 | * Only trigger on a condition evaluation transition. | |
4327 | * | |
4328 | * NOTE: This edge-triggered logic may not be appropriate for | |
4329 | * future condition types. | |
4330 | */ | |
4331 | goto end; | |
4332 | } | |
4333 | ||
e8360425 JD |
4334 | if (!evaluation || !latest_sample_result) { |
4335 | goto end; | |
4336 | } | |
4337 | ||
4338 | switch (condition_type) { | |
4339 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
4340 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
ab0ee2ca JG |
4341 | *evaluation = lttng_evaluation_buffer_usage_create( |
4342 | condition_type, | |
4343 | latest_sample->highest_usage, | |
e8360425 JD |
4344 | channel_info->capacity); |
4345 | break; | |
4346 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
4347 | *evaluation = lttng_evaluation_session_consumed_size_create( | |
e8360425 JD |
4348 | latest_session_consumed_total); |
4349 | break; | |
4350 | default: | |
4351 | abort(); | |
4352 | } | |
4353 | ||
4354 | if (!*evaluation) { | |
4355 | ret = -1; | |
4356 | goto end; | |
ab0ee2ca JG |
4357 | } |
4358 | end: | |
4359 | return ret; | |
4360 | } | |
4361 | ||
4362 | static | |
f2b3ef9f | 4363 | int client_notification_overflow(struct notification_client *client) |
ab0ee2ca | 4364 | { |
f2b3ef9f | 4365 | int ret = 0; |
6bd79809 JG |
4366 | struct lttng_notification_channel_message msg; |
4367 | ||
4368 | msg.type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_NOTIFICATION_DROPPED; | |
4369 | msg.size = 0; | |
4370 | msg.fds = 0; | |
ab0ee2ca | 4371 | |
505b2d90 JG |
4372 | ASSERT_LOCKED(client->lock); |
4373 | ||
f2b3ef9f JG |
4374 | DBG("Dropping notification addressed to client (socket fd = %i)", |
4375 | client->socket); | |
4376 | if (client->communication.outbound.dropped_notification) { | |
4377 | /* | |
4378 | * The client already has a "notification dropped" message | |
4379 | * in its outgoing queue. Nothing to do since all | |
4380 | * of those messages are coalesced. | |
4381 | */ | |
4382 | goto end; | |
4383 | } | |
4384 | ||
4385 | client->communication.outbound.dropped_notification = true; | |
ab0ee2ca | 4386 | ret = lttng_dynamic_buffer_append( |
882093ee | 4387 | &client->communication.outbound.payload.buffer, &msg, |
ab0ee2ca | 4388 | sizeof(msg)); |
f2b3ef9f JG |
4389 | if (ret) { |
4390 | PERROR("Failed to enqueue \"dropped notification\" message in client's (socket fd = %i) outgoing queue", | |
4391 | client->socket); | |
4392 | } | |
4393 | end: | |
ab0ee2ca JG |
4394 | return ret; |
4395 | } | |
4396 | ||
f2b3ef9f JG |
4397 | static int client_handle_transmission_status_wrapper( |
4398 | struct notification_client *client, | |
4399 | enum client_transmission_status status, | |
4400 | void *user_data) | |
4401 | { | |
4402 | return client_handle_transmission_status(client, status, | |
4403 | (struct notification_thread_state *) user_data); | |
4404 | } | |
4405 | ||
4406 | static | |
4407 | int send_evaluation_to_clients(const struct lttng_trigger *trigger, | |
4408 | const struct lttng_evaluation *evaluation, | |
4409 | struct notification_client_list* client_list, | |
4410 | struct notification_thread_state *state, | |
4411 | uid_t object_uid, gid_t object_gid) | |
4412 | { | |
ff588497 JR |
4413 | const struct lttng_credentials creds = { |
4414 | .uid = LTTNG_OPTIONAL_INIT_VALUE(object_uid), | |
4415 | .gid = LTTNG_OPTIONAL_INIT_VALUE(object_gid), | |
4416 | }; | |
4417 | ||
f2b3ef9f | 4418 | return notification_client_list_send_evaluation(client_list, |
52d55cf9 | 4419 | trigger, evaluation, |
ff588497 | 4420 | &creds, |
f2b3ef9f JG |
4421 | client_handle_transmission_status_wrapper, state); |
4422 | } | |
4423 | ||
f37d0f86 JG |
4424 | /* |
4425 | * Permission checks relative to notification channel clients are performed | |
4426 | * here. Notice how object, client, and trigger credentials are involved in | |
4427 | * this check. | |
4428 | * | |
4429 | * The `object` credentials are the credentials associated with the "subject" | |
4430 | * of a condition. For instance, a `rotation completed` condition applies | |
4431 | * to a session. When that condition is met, it will produce an evaluation | |
4432 | * against a session. Hence, in this case, the `object` credentials are the | |
4433 | * credentials of the "subject" session. | |
4434 | * | |
4435 | * The `trigger` credentials are the credentials of the user that registered the | |
4436 | * trigger. | |
4437 | * | |
4438 | * The `client` credentials are the credentials of the user that created a given | |
4439 | * notification channel. | |
4440 | * | |
4441 | * In terms of visibility, it is expected that non-privilieged users can only | |
4442 | * register triggers against "their" objects (their own sessions and | |
4443 | * applications they are allowed to interact with). They can then open a | |
4444 | * notification channel and subscribe to notifications associated with those | |
4445 | * triggers. | |
4446 | * | |
4447 | * As for privilieged users, they can register triggers against the objects of | |
4448 | * other users. They can then subscribe to the notifications associated to their | |
4449 | * triggers. Privilieged users _can't_ subscribe to the notifications of | |
4450 | * triggers owned by other users; they must create their own triggers. | |
4451 | * | |
4452 | * This is more a concern of usability than security. It would be difficult for | |
4453 | * a root user reliably subscribe to a specific set of conditions without | |
4454 | * interference from external users (those could, for instance, unregister | |
4455 | * their triggers). | |
4456 | */ | |
f2b3ef9f JG |
4457 | int notification_client_list_send_evaluation( |
4458 | struct notification_client_list *client_list, | |
52d55cf9 | 4459 | const struct lttng_trigger *trigger, |
9b63a4aa | 4460 | const struct lttng_evaluation *evaluation, |
f2b3ef9f JG |
4461 | const struct lttng_credentials *source_object_creds, |
4462 | report_client_transmission_result_cb client_report, | |
4463 | void *user_data) | |
ab0ee2ca JG |
4464 | { |
4465 | int ret = 0; | |
c0a66c84 | 4466 | struct lttng_payload msg_payload; |
ab0ee2ca | 4467 | struct notification_client_list_element *client_list_element, *tmp; |
9b63a4aa | 4468 | const struct lttng_notification notification = { |
52d55cf9 | 4469 | .trigger = (struct lttng_trigger *) trigger, |
9b63a4aa JG |
4470 | .evaluation = (struct lttng_evaluation *) evaluation, |
4471 | }; | |
6bd79809 | 4472 | struct lttng_notification_channel_message msg_header; |
52d55cf9 JG |
4473 | const struct lttng_credentials *trigger_creds = |
4474 | lttng_trigger_get_credentials(trigger); | |
ab0ee2ca | 4475 | |
c0a66c84 | 4476 | lttng_payload_init(&msg_payload); |
ab0ee2ca | 4477 | |
6bd79809 JG |
4478 | msg_header.type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_NOTIFICATION; |
4479 | msg_header.size = 0; | |
4480 | msg_header.fds = 0; | |
4481 | ||
c0a66c84 | 4482 | ret = lttng_dynamic_buffer_append(&msg_payload.buffer, &msg_header, |
3647288f | 4483 | sizeof(msg_header)); |
ab0ee2ca JG |
4484 | if (ret) { |
4485 | goto end; | |
4486 | } | |
4487 | ||
c0a66c84 | 4488 | ret = lttng_notification_serialize(¬ification, &msg_payload); |
ab0ee2ca | 4489 | if (ret) { |
bd0514a5 | 4490 | ERR("Failed to serialize notification"); |
ab0ee2ca JG |
4491 | ret = -1; |
4492 | goto end; | |
4493 | } | |
4494 | ||
3647288f | 4495 | /* Update payload size. */ |
505b2d90 JG |
4496 | ((struct lttng_notification_channel_message *) msg_payload.buffer.data) |
4497 | ->size = (uint32_t)( | |
4498 | msg_payload.buffer.size - sizeof(msg_header)); | |
3647288f | 4499 | |
882093ee JR |
4500 | /* Update the payload number of fds. */ |
4501 | { | |
4502 | const struct lttng_payload_view pv = lttng_payload_view_from_payload( | |
4503 | &msg_payload, 0, -1); | |
4504 | ||
4505 | ((struct lttng_notification_channel_message *) | |
4506 | msg_payload.buffer.data)->fds = (uint32_t) | |
4507 | lttng_payload_view_get_fd_handle_count(&pv); | |
4508 | } | |
4509 | ||
505b2d90 | 4510 | pthread_mutex_lock(&client_list->lock); |
ab0ee2ca | 4511 | cds_list_for_each_entry_safe(client_list_element, tmp, |
091fa780 | 4512 | &client_list->clients_list, node) { |
f2b3ef9f | 4513 | enum client_transmission_status transmission_status; |
ab0ee2ca JG |
4514 | struct notification_client *client = |
4515 | client_list_element->client; | |
4516 | ||
505b2d90 JG |
4517 | ret = 0; |
4518 | pthread_mutex_lock(&client->lock); | |
6c24d3fd JG |
4519 | if (!client->communication.active) { |
4520 | /* | |
4521 | * Skip inactive client (protocol error or | |
4522 | * disconnecting). | |
4523 | */ | |
4524 | DBG("Skipping client at it is marked as inactive"); | |
4525 | goto skip_client; | |
4526 | } | |
4527 | ||
f2bda80e JG |
4528 | if (lttng_trigger_is_hidden(trigger) && !client->is_sessiond) { |
4529 | /* | |
4530 | * Notifications resulting from an hidden trigger are | |
4531 | * only sent to the session daemon. | |
4532 | */ | |
70eb2f6f JG |
4533 | DBG("Skipping client as the trigger is hidden and the client is not the session daemon"); |
4534 | goto skip_client; | |
f2bda80e JG |
4535 | } |
4536 | ||
f2b3ef9f | 4537 | if (source_object_creds) { |
ff588497 JR |
4538 | if (client->uid != lttng_credentials_get_uid(source_object_creds) && |
4539 | client->gid != lttng_credentials_get_gid(source_object_creds) && | |
f2b3ef9f JG |
4540 | client->uid != 0) { |
4541 | /* | |
4542 | * Client is not allowed to monitor this | |
4543 | * object. | |
4544 | */ | |
bd0514a5 | 4545 | DBG("Skipping client at it does not have the object permission to receive notification for this trigger"); |
6c24d3fd | 4546 | goto skip_client; |
f2b3ef9f | 4547 | } |
90843f49 JR |
4548 | } |
4549 | ||
f712e5f6 | 4550 | if (client->uid != lttng_credentials_get_uid(trigger_creds)) { |
bd0514a5 | 4551 | DBG("Skipping client at it does not have the permission to receive notification for this trigger"); |
6c24d3fd | 4552 | goto skip_client; |
ab0ee2ca JG |
4553 | } |
4554 | ||
bd0514a5 | 4555 | DBG("Sending notification to client (fd = %i, %zu bytes)", |
c0a66c84 | 4556 | client->socket, msg_payload.buffer.size); |
882093ee JR |
4557 | |
4558 | if (client_has_outbound_data_left(client)) { | |
ab0ee2ca JG |
4559 | /* |
4560 | * Outgoing data is already buffered for this client; | |
4561 | * drop the notification and enqueue a "dropped | |
4562 | * notification" message if this is the first dropped | |
4563 | * notification since the socket spilled-over to the | |
4564 | * queue. | |
4565 | */ | |
f2b3ef9f JG |
4566 | ret = client_notification_overflow(client); |
4567 | if (ret) { | |
6c24d3fd JG |
4568 | /* Fatal error. */ |
4569 | goto skip_client; | |
ab0ee2ca | 4570 | } |
ab0ee2ca JG |
4571 | } |
4572 | ||
882093ee | 4573 | ret = lttng_payload_copy(&msg_payload, &client->communication.outbound.payload); |
ab0ee2ca | 4574 | if (ret) { |
6c24d3fd JG |
4575 | /* Fatal error. */ |
4576 | goto skip_client; | |
ab0ee2ca JG |
4577 | } |
4578 | ||
f2b3ef9f | 4579 | transmission_status = client_flush_outgoing_queue(client); |
6c24d3fd | 4580 | pthread_mutex_unlock(&client->lock); |
f2b3ef9f | 4581 | ret = client_report(client, transmission_status, user_data); |
ab0ee2ca | 4582 | if (ret) { |
6c24d3fd JG |
4583 | /* Fatal error. */ |
4584 | goto end_unlock_list; | |
505b2d90 | 4585 | } |
6c24d3fd JG |
4586 | |
4587 | continue; | |
4588 | ||
4589 | skip_client: | |
505b2d90 JG |
4590 | pthread_mutex_unlock(&client->lock); |
4591 | if (ret) { | |
6c24d3fd | 4592 | /* Fatal error. */ |
505b2d90 | 4593 | goto end_unlock_list; |
ab0ee2ca JG |
4594 | } |
4595 | } | |
4596 | ret = 0; | |
505b2d90 JG |
4597 | |
4598 | end_unlock_list: | |
4599 | pthread_mutex_unlock(&client_list->lock); | |
ab0ee2ca | 4600 | end: |
c0a66c84 | 4601 | lttng_payload_reset(&msg_payload); |
ab0ee2ca JG |
4602 | return ret; |
4603 | } | |
4604 | ||
8b524060 FD |
4605 | static |
4606 | struct lttng_event_notifier_notification *recv_one_event_notifier_notification( | |
b9a8d78f | 4607 | int notification_pipe_read_fd, enum lttng_domain_type domain) |
94078603 JR |
4608 | { |
4609 | int ret; | |
b9a8d78f FD |
4610 | uint64_t token; |
4611 | struct lttng_event_notifier_notification *notification = NULL; | |
82b3cbf4 JR |
4612 | char *capture_buffer = NULL; |
4613 | size_t capture_buffer_size; | |
94078603 JR |
4614 | void *reception_buffer; |
4615 | size_t reception_size; | |
4616 | ||
fc4b93fa | 4617 | struct lttng_ust_abi_event_notifier_notification ust_notification; |
b8e2fb80 | 4618 | struct lttng_kernel_abi_event_notifier_notification kernel_notification; |
94078603 | 4619 | |
b9a8d78f | 4620 | /* Init lttng_event_notifier_notification */ |
94078603 JR |
4621 | switch(domain) { |
4622 | case LTTNG_DOMAIN_UST: | |
4623 | reception_buffer = (void *) &ust_notification; | |
4624 | reception_size = sizeof(ust_notification); | |
94078603 JR |
4625 | break; |
4626 | case LTTNG_DOMAIN_KERNEL: | |
4627 | reception_buffer = (void *) &kernel_notification; | |
4628 | reception_size = sizeof(kernel_notification); | |
94078603 JR |
4629 | break; |
4630 | default: | |
4631 | abort(); | |
4632 | } | |
4633 | ||
4634 | /* | |
4635 | * The monitoring pipe only holds messages smaller than PIPE_BUF, | |
4636 | * ensuring that read/write of tracer notifications are atomic. | |
4637 | */ | |
4638 | ret = lttng_read(notification_pipe_read_fd, reception_buffer, | |
4639 | reception_size); | |
4640 | if (ret != reception_size) { | |
4641 | PERROR("Failed to read from event source notification pipe: fd = %d, size to read = %zu, ret = %d", | |
4642 | notification_pipe_read_fd, reception_size, ret); | |
4643 | ret = -1; | |
4644 | goto end; | |
4645 | } | |
4646 | ||
4647 | switch(domain) { | |
4648 | case LTTNG_DOMAIN_UST: | |
b9a8d78f | 4649 | token = ust_notification.token; |
82b3cbf4 | 4650 | capture_buffer_size = ust_notification.capture_buf_size; |
94078603 JR |
4651 | break; |
4652 | case LTTNG_DOMAIN_KERNEL: | |
b9a8d78f | 4653 | token = kernel_notification.token; |
bbd6675c | 4654 | capture_buffer_size = kernel_notification.capture_buf_size; |
94078603 JR |
4655 | break; |
4656 | default: | |
4657 | abort(); | |
4658 | } | |
4659 | ||
82b3cbf4 JR |
4660 | if (capture_buffer_size == 0) { |
4661 | capture_buffer = NULL; | |
4662 | goto skip_capture; | |
4663 | } | |
4664 | ||
4665 | if (capture_buffer_size > MAX_CAPTURE_SIZE) { | |
bd0514a5 | 4666 | ERR("Event notifier has a capture payload size which exceeds the maximum allowed size: capture_payload_size = %zu bytes, max allowed size = %d bytes", |
82b3cbf4 JR |
4667 | capture_buffer_size, MAX_CAPTURE_SIZE); |
4668 | goto end; | |
4669 | } | |
4670 | ||
64803277 | 4671 | capture_buffer = calloc<char>(capture_buffer_size); |
82b3cbf4 | 4672 | if (!capture_buffer) { |
bd0514a5 | 4673 | ERR("Failed to allocate capture buffer"); |
82b3cbf4 JR |
4674 | goto end; |
4675 | } | |
4676 | ||
4677 | /* Fetch additional payload (capture). */ | |
4678 | ret = lttng_read(notification_pipe_read_fd, capture_buffer, capture_buffer_size); | |
4679 | if (ret != capture_buffer_size) { | |
bd0514a5 | 4680 | ERR("Failed to read from event source pipe (fd = %i)", |
82b3cbf4 JR |
4681 | notification_pipe_read_fd); |
4682 | goto end; | |
4683 | } | |
4684 | ||
4685 | skip_capture: | |
4686 | notification = lttng_event_notifier_notification_create(token, domain, | |
4687 | capture_buffer, capture_buffer_size); | |
4688 | if (notification == NULL) { | |
4689 | goto end; | |
4690 | } | |
4691 | ||
4692 | /* | |
4693 | * Ownership transfered to the lttng_event_notifier_notification object. | |
4694 | */ | |
4695 | capture_buffer = NULL; | |
4696 | ||
b9a8d78f | 4697 | end: |
82b3cbf4 | 4698 | free(capture_buffer); |
b9a8d78f FD |
4699 | return notification; |
4700 | } | |
4701 | ||
8b524060 FD |
4702 | static |
4703 | int dispatch_one_event_notifier_notification(struct notification_thread_state *state, | |
4704 | struct lttng_event_notifier_notification *notification) | |
b9a8d78f | 4705 | { |
b9a8d78f FD |
4706 | struct cds_lfht_node *node; |
4707 | struct cds_lfht_iter iter; | |
4708 | struct notification_trigger_tokens_ht_element *element; | |
4709 | struct lttng_evaluation *evaluation = NULL; | |
b9a8d78f FD |
4710 | enum action_executor_status executor_status; |
4711 | struct notification_client_list *client_list = NULL; | |
8b524060 | 4712 | int ret; |
7c920b63 | 4713 | unsigned int capture_count = 0; |
b9a8d78f | 4714 | |
94078603 JR |
4715 | /* Find triggers associated with this token. */ |
4716 | rcu_read_lock(); | |
4717 | cds_lfht_lookup(state->trigger_tokens_ht, | |
b9a8d78f FD |
4718 | hash_key_u64(¬ification->tracer_token, lttng_ht_seed), |
4719 | match_trigger_token, ¬ification->tracer_token, &iter); | |
94078603 | 4720 | node = cds_lfht_iter_get_node(&iter); |
f1446131 | 4721 | if (caa_unlikely(!node)) { |
94078603 | 4722 | /* |
f1446131 JR |
4723 | * This is not an error, slow consumption of the tracer |
4724 | * notifications can lead to situations where a trigger is | |
4725 | * removed but we still get tracer notifications matching a | |
4726 | * trigger that no longer exists. | |
94078603 JR |
4727 | */ |
4728 | ret = 0; | |
4729 | goto end_unlock; | |
4730 | } | |
4731 | ||
4732 | element = caa_container_of(node, | |
4733 | struct notification_trigger_tokens_ht_element, | |
4734 | node); | |
4735 | ||
8dbb86b8 | 4736 | if (lttng_condition_event_rule_matches_get_capture_descriptor_count( |
7c920b63 PP |
4737 | lttng_trigger_get_const_condition(element->trigger), |
4738 | &capture_count) != LTTNG_CONDITION_STATUS_OK) { | |
4739 | ERR("Failed to get capture count"); | |
4740 | ret = -1; | |
4741 | goto end; | |
4742 | } | |
4743 | ||
4744 | if (!notification->capture_buffer && capture_count != 0) { | |
4745 | ERR("Expected capture but capture buffer is null"); | |
4746 | ret = -1; | |
4747 | goto end; | |
4748 | } | |
4749 | ||
8dbb86b8 | 4750 | evaluation = lttng_evaluation_event_rule_matches_create( |
0114db0e | 4751 | lttng::utils::container_of(lttng_trigger_get_const_condition( |
7c920b63 | 4752 | element->trigger), |
0114db0e | 4753 | <tng_condition_event_rule_matches::parent), |
7c920b63 PP |
4754 | notification->capture_buffer, |
4755 | notification->capture_buf_size, false); | |
4756 | ||
f1446131 | 4757 | if (evaluation == NULL) { |
8c1d25ff | 4758 | ERR("Failed to create event rule matches evaluation while creating and enqueuing action executor job"); |
f1446131 JR |
4759 | ret = -1; |
4760 | goto end_unlock; | |
4761 | } | |
8c1d25ff | 4762 | |
f1446131 JR |
4763 | client_list = get_client_list_from_condition(state, |
4764 | lttng_trigger_get_const_condition(element->trigger)); | |
72365501 | 4765 | executor_status = action_executor_enqueue_trigger(state->executor, |
f1446131 JR |
4766 | element->trigger, evaluation, NULL, client_list); |
4767 | switch (executor_status) { | |
4768 | case ACTION_EXECUTOR_STATUS_OK: | |
4769 | ret = 0; | |
4770 | break; | |
4771 | case ACTION_EXECUTOR_STATUS_OVERFLOW: | |
4772 | { | |
4773 | struct notification_client_list_element *client_list_element, | |
4774 | *tmp; | |
4775 | ||
4776 | /* | |
4777 | * Not a fatal error; this is expected and simply means the | |
4778 | * executor has too much work queued already. | |
4779 | */ | |
4780 | ret = 0; | |
4781 | ||
4782 | /* No clients subscribed to notifications for this trigger. */ | |
4783 | if (!client_list) { | |
4784 | break; | |
4785 | } | |
4786 | ||
4787 | /* Warn clients that a notification (or more) was dropped. */ | |
4788 | pthread_mutex_lock(&client_list->lock); | |
4789 | cds_list_for_each_entry_safe(client_list_element, tmp, | |
091fa780 | 4790 | &client_list->clients_list, node) { |
f1446131 JR |
4791 | enum client_transmission_status transmission_status; |
4792 | struct notification_client *client = | |
4793 | client_list_element->client; | |
4794 | ||
4795 | pthread_mutex_lock(&client->lock); | |
4796 | ret = client_notification_overflow(client); | |
4797 | if (ret) { | |
4798 | /* Fatal error. */ | |
4799 | goto next_client; | |
4800 | } | |
4801 | ||
4802 | transmission_status = | |
4803 | client_flush_outgoing_queue(client); | |
4804 | ret = client_handle_transmission_status( | |
4805 | client, transmission_status, state); | |
4806 | if (ret) { | |
4807 | /* Fatal error. */ | |
4808 | goto next_client; | |
4809 | } | |
4810 | next_client: | |
4811 | pthread_mutex_unlock(&client->lock); | |
4812 | if (ret) { | |
4813 | break; | |
4814 | } | |
4815 | } | |
4816 | ||
4817 | pthread_mutex_unlock(&client_list->lock); | |
4818 | break; | |
4819 | } | |
98dfca79 | 4820 | case ACTION_EXECUTOR_STATUS_INVALID: |
f1446131 JR |
4821 | case ACTION_EXECUTOR_STATUS_ERROR: |
4822 | /* Fatal error, shut down everything. */ | |
4823 | ERR("Fatal error encoutered while enqueuing action to the action executor"); | |
4824 | ret = -1; | |
4825 | goto end_unlock; | |
4826 | default: | |
4827 | /* Unhandled error. */ | |
4828 | abort(); | |
4829 | } | |
94078603 JR |
4830 | |
4831 | end_unlock: | |
f1446131 | 4832 | notification_client_list_put(client_list); |
94078603 | 4833 | rcu_read_unlock(); |
7c920b63 | 4834 | end: |
8b524060 FD |
4835 | return ret; |
4836 | } | |
4837 | ||
4838 | static | |
4839 | int handle_one_event_notifier_notification( | |
4840 | struct notification_thread_state *state, | |
4841 | int pipe, enum lttng_domain_type domain) | |
4842 | { | |
82b3cbf4 | 4843 | int ret = 0; |
8b524060 FD |
4844 | struct lttng_event_notifier_notification *notification = NULL; |
4845 | ||
4846 | notification = recv_one_event_notifier_notification(pipe, domain); | |
4847 | if (notification == NULL) { | |
82b3cbf4 | 4848 | /* Reception failed, don't consider it fatal. */ |
bd0514a5 | 4849 | ERR("Error receiving an event notifier notification from tracer: fd = %i, domain = %s", |
8b524060 | 4850 | pipe, lttng_domain_type_str(domain)); |
8b524060 FD |
4851 | goto end; |
4852 | } | |
4853 | ||
4854 | ret = dispatch_one_event_notifier_notification(state, notification); | |
4855 | if (ret) { | |
bd0514a5 | 4856 | ERR("Error dispatching an event notifier notification from tracer: fd = %i, domain = %s", |
8b524060 FD |
4857 | pipe, lttng_domain_type_str(domain)); |
4858 | goto end; | |
4859 | } | |
4860 | ||
94078603 | 4861 | end: |
8b524060 | 4862 | lttng_event_notifier_notification_destroy(notification); |
94078603 JR |
4863 | return ret; |
4864 | } | |
4865 | ||
8b524060 FD |
4866 | int handle_notification_thread_event_notification(struct notification_thread_state *state, |
4867 | int pipe, enum lttng_domain_type domain) | |
4868 | { | |
4869 | return handle_one_event_notifier_notification(state, pipe, domain); | |
4870 | } | |
4871 | ||
ab0ee2ca JG |
4872 | int handle_notification_thread_channel_sample( |
4873 | struct notification_thread_state *state, int pipe, | |
4874 | enum lttng_domain_type domain) | |
4875 | { | |
4876 | int ret = 0; | |
4877 | struct lttcomm_consumer_channel_monitor_msg sample_msg; | |
ab0ee2ca JG |
4878 | struct channel_info *channel_info; |
4879 | struct cds_lfht_node *node; | |
4880 | struct cds_lfht_iter iter; | |
4881 | struct lttng_channel_trigger_list *trigger_list; | |
4882 | struct lttng_trigger_list_element *trigger_list_element; | |
4883 | bool previous_sample_available = false; | |
e8360425 JD |
4884 | struct channel_state_sample previous_sample, latest_sample; |
4885 | uint64_t previous_session_consumed_total, latest_session_consumed_total; | |
f2b3ef9f | 4886 | struct lttng_credentials channel_creds; |
ab0ee2ca JG |
4887 | |
4888 | /* | |
4889 | * The monitoring pipe only holds messages smaller than PIPE_BUF, | |
4890 | * ensuring that read/write of sampling messages are atomic. | |
4891 | */ | |
7c2551ef | 4892 | ret = lttng_read(pipe, &sample_msg, sizeof(sample_msg)); |
ab0ee2ca | 4893 | if (ret != sizeof(sample_msg)) { |
bd0514a5 | 4894 | ERR("Failed to read from monitoring pipe (fd = %i)", |
ab0ee2ca JG |
4895 | pipe); |
4896 | ret = -1; | |
4897 | goto end; | |
4898 | } | |
4899 | ||
4900 | ret = 0; | |
4901 | latest_sample.key.key = sample_msg.key; | |
4902 | latest_sample.key.domain = domain; | |
4903 | latest_sample.highest_usage = sample_msg.highest; | |
4904 | latest_sample.lowest_usage = sample_msg.lowest; | |
e8360425 | 4905 | latest_sample.channel_total_consumed = sample_msg.total_consumed; |
ab0ee2ca JG |
4906 | |
4907 | rcu_read_lock(); | |
4908 | ||
4909 | /* Retrieve the channel's informations */ | |
4910 | cds_lfht_lookup(state->channels_ht, | |
4911 | hash_channel_key(&latest_sample.key), | |
4912 | match_channel_info, | |
4913 | &latest_sample.key, | |
4914 | &iter); | |
4915 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 4916 | if (caa_unlikely(!node)) { |
ab0ee2ca JG |
4917 | /* |
4918 | * Not an error since the consumer can push a sample to the pipe | |
4919 | * and the rest of the session daemon could notify us of the | |
4920 | * channel's destruction before we get a chance to process that | |
4921 | * sample. | |
4922 | */ | |
bd0514a5 | 4923 | DBG("Received a sample for an unknown channel from consumerd, key = %" PRIu64 " in %s domain", |
ab0ee2ca | 4924 | latest_sample.key.key, |
526200e4 | 4925 | lttng_domain_type_str(domain)); |
ab0ee2ca JG |
4926 | goto end_unlock; |
4927 | } | |
4928 | channel_info = caa_container_of(node, struct channel_info, | |
4929 | channels_ht_node); | |
bd0514a5 | 4930 | DBG("Handling channel sample for channel %s (key = %" PRIu64 ") in session %s (highest usage = %" PRIu64 ", lowest usage = %" PRIu64", total consumed = %" PRIu64")", |
8abe313a | 4931 | channel_info->name, |
ab0ee2ca | 4932 | latest_sample.key.key, |
8abe313a | 4933 | channel_info->session_info->name, |
ab0ee2ca | 4934 | latest_sample.highest_usage, |
e8360425 JD |
4935 | latest_sample.lowest_usage, |
4936 | latest_sample.channel_total_consumed); | |
4937 | ||
4938 | previous_session_consumed_total = | |
4939 | channel_info->session_info->consumed_data_size; | |
ab0ee2ca JG |
4940 | |
4941 | /* Retrieve the channel's last sample, if it exists, and update it. */ | |
4942 | cds_lfht_lookup(state->channel_state_ht, | |
4943 | hash_channel_key(&latest_sample.key), | |
4944 | match_channel_state_sample, | |
4945 | &latest_sample.key, | |
4946 | &iter); | |
4947 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 4948 | if (caa_likely(node)) { |
ab0ee2ca JG |
4949 | struct channel_state_sample *stored_sample; |
4950 | ||
4951 | /* Update the sample stored. */ | |
4952 | stored_sample = caa_container_of(node, | |
4953 | struct channel_state_sample, | |
4954 | channel_state_ht_node); | |
e8360425 | 4955 | |
ab0ee2ca JG |
4956 | memcpy(&previous_sample, stored_sample, |
4957 | sizeof(previous_sample)); | |
4958 | stored_sample->highest_usage = latest_sample.highest_usage; | |
4959 | stored_sample->lowest_usage = latest_sample.lowest_usage; | |
0f0479d7 | 4960 | stored_sample->channel_total_consumed = latest_sample.channel_total_consumed; |
ab0ee2ca | 4961 | previous_sample_available = true; |
e8360425 JD |
4962 | |
4963 | latest_session_consumed_total = | |
4964 | previous_session_consumed_total + | |
4965 | (latest_sample.channel_total_consumed - previous_sample.channel_total_consumed); | |
ab0ee2ca JG |
4966 | } else { |
4967 | /* | |
4968 | * This is the channel's first sample, allocate space for and | |
4969 | * store the new sample. | |
4970 | */ | |
4971 | struct channel_state_sample *stored_sample; | |
4972 | ||
64803277 | 4973 | stored_sample = zmalloc<channel_state_sample>(); |
ab0ee2ca JG |
4974 | if (!stored_sample) { |
4975 | ret = -1; | |
4976 | goto end_unlock; | |
4977 | } | |
4978 | ||
4979 | memcpy(stored_sample, &latest_sample, sizeof(*stored_sample)); | |
4980 | cds_lfht_node_init(&stored_sample->channel_state_ht_node); | |
4981 | cds_lfht_add(state->channel_state_ht, | |
4982 | hash_channel_key(&stored_sample->key), | |
4983 | &stored_sample->channel_state_ht_node); | |
e8360425 JD |
4984 | |
4985 | latest_session_consumed_total = | |
4986 | previous_session_consumed_total + | |
4987 | latest_sample.channel_total_consumed; | |
ab0ee2ca JG |
4988 | } |
4989 | ||
e8360425 JD |
4990 | channel_info->session_info->consumed_data_size = |
4991 | latest_session_consumed_total; | |
4992 | ||
ab0ee2ca JG |
4993 | /* Find triggers associated with this channel. */ |
4994 | cds_lfht_lookup(state->channel_triggers_ht, | |
4995 | hash_channel_key(&latest_sample.key), | |
4996 | match_channel_trigger_list, | |
4997 | &latest_sample.key, | |
4998 | &iter); | |
4999 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 5000 | if (caa_likely(!node)) { |
ab0ee2ca JG |
5001 | goto end_unlock; |
5002 | } | |
5003 | ||
f2b3ef9f | 5004 | channel_creds = (typeof(channel_creds)) { |
ff588497 JR |
5005 | .uid = LTTNG_OPTIONAL_INIT_VALUE(channel_info->session_info->uid), |
5006 | .gid = LTTNG_OPTIONAL_INIT_VALUE(channel_info->session_info->gid), | |
f2b3ef9f JG |
5007 | }; |
5008 | ||
ab0ee2ca JG |
5009 | trigger_list = caa_container_of(node, struct lttng_channel_trigger_list, |
5010 | channel_triggers_ht_node); | |
5011 | cds_list_for_each_entry(trigger_list_element, &trigger_list->list, | |
e742b055 | 5012 | node) { |
9b63a4aa | 5013 | const struct lttng_condition *condition; |
f2b3ef9f | 5014 | struct lttng_trigger *trigger; |
505b2d90 | 5015 | struct notification_client_list *client_list = NULL; |
ab0ee2ca | 5016 | struct lttng_evaluation *evaluation = NULL; |
f2b3ef9f | 5017 | enum action_executor_status executor_status; |
ab0ee2ca | 5018 | |
505b2d90 | 5019 | ret = 0; |
ab0ee2ca | 5020 | trigger = trigger_list_element->trigger; |
9b63a4aa | 5021 | condition = lttng_trigger_get_const_condition(trigger); |
a0377dfe | 5022 | LTTNG_ASSERT(condition); |
ab0ee2ca JG |
5023 | |
5024 | /* | |
5025 | * Check if any client is subscribed to the result of this | |
5026 | * evaluation. | |
5027 | */ | |
ed327204 | 5028 | client_list = get_client_list_from_condition(state, condition); |
ab0ee2ca | 5029 | |
ed327204 | 5030 | ret = evaluate_buffer_condition(condition, &evaluation, state, |
ab0ee2ca | 5031 | previous_sample_available ? &previous_sample : NULL, |
e8360425 JD |
5032 | &latest_sample, |
5033 | previous_session_consumed_total, | |
5034 | latest_session_consumed_total, | |
5035 | channel_info); | |
5036 | if (caa_unlikely(ret)) { | |
505b2d90 | 5037 | goto put_list; |
ab0ee2ca JG |
5038 | } |
5039 | ||
e8360425 | 5040 | if (caa_likely(!evaluation)) { |
505b2d90 | 5041 | goto put_list; |
ab0ee2ca JG |
5042 | } |
5043 | ||
f2b3ef9f JG |
5044 | /* |
5045 | * Ownership of `evaluation` transferred to the action executor | |
5046 | * no matter the result. | |
5047 | */ | |
72365501 JR |
5048 | executor_status = action_executor_enqueue_trigger( |
5049 | state->executor, trigger, evaluation, | |
5050 | &channel_creds, client_list); | |
f2b3ef9f JG |
5051 | evaluation = NULL; |
5052 | switch (executor_status) { | |
5053 | case ACTION_EXECUTOR_STATUS_OK: | |
5054 | break; | |
5055 | case ACTION_EXECUTOR_STATUS_ERROR: | |
5056 | case ACTION_EXECUTOR_STATUS_INVALID: | |
5057 | /* | |
5058 | * TODO Add trigger identification (name/id) when | |
5059 | * it is added to the API. | |
5060 | */ | |
5061 | ERR("Fatal error occurred while enqueuing action associated with buffer-condition trigger"); | |
5062 | ret = -1; | |
5063 | goto put_list; | |
5064 | case ACTION_EXECUTOR_STATUS_OVERFLOW: | |
5065 | /* | |
5066 | * TODO Add trigger identification (name/id) when | |
5067 | * it is added to the API. | |
5068 | * | |
5069 | * Not a fatal error. | |
5070 | */ | |
5071 | WARN("No space left when enqueuing action associated with buffer-condition trigger"); | |
5072 | ret = 0; | |
5073 | goto put_list; | |
5074 | default: | |
5075 | abort(); | |
5076 | } | |
5077 | ||
505b2d90 JG |
5078 | put_list: |
5079 | notification_client_list_put(client_list); | |
e0b5f87b | 5080 | if (caa_unlikely(ret)) { |
505b2d90 | 5081 | break; |
ab0ee2ca JG |
5082 | } |
5083 | } | |
5084 | end_unlock: | |
5085 | rcu_read_unlock(); | |
5086 | end: | |
5087 | return ret; | |
5088 | } |