Commit | Line | Data |
---|---|---|
91d76f53 | 1 | /* |
ab5be9fa MJ |
2 | * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca> |
3 | * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
91d76f53 | 4 | * |
ab5be9fa | 5 | * SPDX-License-Identifier: GPL-2.0-only |
91d76f53 | 6 | * |
91d76f53 DG |
7 | */ |
8 | ||
6c1c0768 | 9 | #define _LGPL_SOURCE |
7972aab2 | 10 | #include <inttypes.h> |
91d76f53 DG |
11 | #include <pthread.h> |
12 | #include <stdio.h> | |
13 | #include <stdlib.h> | |
099e26bd | 14 | #include <string.h> |
aba8e916 DG |
15 | #include <sys/stat.h> |
16 | #include <sys/types.h> | |
099e26bd | 17 | #include <unistd.h> |
0df502fd | 18 | #include <urcu/compiler.h> |
331744e3 | 19 | #include <signal.h> |
bec39940 | 20 | |
763f0d4c | 21 | #include <common/bytecode/bytecode.h> |
edf4b93e | 22 | #include <common/compat/errno.h> |
990570ed | 23 | #include <common/common.h> |
993578ff JR |
24 | #include <common/hashtable/utils.h> |
25 | #include <lttng/event-rule/event-rule.h> | |
26 | #include <lttng/event-rule/event-rule-internal.h> | |
27 | #include <lttng/event-rule/tracepoint.h> | |
28 | #include <lttng/condition/condition.h> | |
29 | #include <lttng/condition/event-rule-internal.h> | |
30 | #include <lttng/condition/event-rule.h> | |
f83be61d | 31 | #include <lttng/trigger/trigger-internal.h> |
86acf0da | 32 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 33 | |
7972aab2 | 34 | #include "buffer-registry.h" |
86acf0da | 35 | #include "fd-limit.h" |
8782cc74 | 36 | #include "health-sessiond.h" |
56fff090 | 37 | #include "ust-app.h" |
48842b30 | 38 | #include "ust-consumer.h" |
75018ab6 JG |
39 | #include "lttng-ust-ctl.h" |
40 | #include "lttng-ust-error.h" | |
0b2dc8df | 41 | #include "utils.h" |
fb83fe64 | 42 | #include "session.h" |
e9404c27 JG |
43 | #include "lttng-sessiond.h" |
44 | #include "notification-thread-commands.h" | |
5c408ad8 | 45 | #include "rotate.h" |
44760c20 | 46 | #include "event.h" |
d80a6244 | 47 | |
44cdb3a2 MJ |
48 | struct lttng_ht *ust_app_ht; |
49 | struct lttng_ht *ust_app_ht_by_sock; | |
50 | struct lttng_ht *ust_app_ht_by_notify_sock; | |
51 | ||
c4b88406 MD |
52 | static |
53 | int ust_app_flush_app_session(struct ust_app *app, struct ust_app_session *ua_sess); | |
54 | ||
d9bf3ca4 MD |
55 | /* Next available channel key. Access under next_channel_key_lock. */ |
56 | static uint64_t _next_channel_key; | |
57 | static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER; | |
58 | ||
59 | /* Next available session ID. Access under next_session_id_lock. */ | |
60 | static uint64_t _next_session_id; | |
61 | static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER; | |
ffe60014 DG |
62 | |
63 | /* | |
d9bf3ca4 | 64 | * Return the incremented value of next_channel_key. |
ffe60014 | 65 | */ |
d9bf3ca4 | 66 | static uint64_t get_next_channel_key(void) |
ffe60014 | 67 | { |
d9bf3ca4 MD |
68 | uint64_t ret; |
69 | ||
70 | pthread_mutex_lock(&next_channel_key_lock); | |
71 | ret = ++_next_channel_key; | |
72 | pthread_mutex_unlock(&next_channel_key_lock); | |
73 | return ret; | |
ffe60014 DG |
74 | } |
75 | ||
76 | /* | |
7972aab2 | 77 | * Return the atomically incremented value of next_session_id. |
ffe60014 | 78 | */ |
d9bf3ca4 | 79 | static uint64_t get_next_session_id(void) |
ffe60014 | 80 | { |
d9bf3ca4 MD |
81 | uint64_t ret; |
82 | ||
83 | pthread_mutex_lock(&next_session_id_lock); | |
84 | ret = ++_next_session_id; | |
85 | pthread_mutex_unlock(&next_session_id_lock); | |
86 | return ret; | |
ffe60014 DG |
87 | } |
88 | ||
d65d2de8 DG |
89 | static void copy_channel_attr_to_ustctl( |
90 | struct ustctl_consumer_channel_attr *attr, | |
91 | struct lttng_ust_channel_attr *uattr) | |
92 | { | |
93 | /* Copy event attributes since the layout is different. */ | |
94 | attr->subbuf_size = uattr->subbuf_size; | |
95 | attr->num_subbuf = uattr->num_subbuf; | |
96 | attr->overwrite = uattr->overwrite; | |
97 | attr->switch_timer_interval = uattr->switch_timer_interval; | |
98 | attr->read_timer_interval = uattr->read_timer_interval; | |
99 | attr->output = uattr->output; | |
491d1539 | 100 | attr->blocking_timeout = uattr->u.s.blocking_timeout; |
d65d2de8 DG |
101 | } |
102 | ||
025faf73 DG |
103 | /* |
104 | * Match function for the hash table lookup. | |
105 | * | |
106 | * It matches an ust app event based on three attributes which are the event | |
107 | * name, the filter bytecode and the loglevel. | |
108 | */ | |
18eace3b DG |
109 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
110 | { | |
111 | struct ust_app_event *event; | |
112 | const struct ust_app_ht_key *key; | |
2106efa0 | 113 | int ev_loglevel_value; |
18eace3b DG |
114 | |
115 | assert(node); | |
116 | assert(_key); | |
117 | ||
118 | event = caa_container_of(node, struct ust_app_event, node.node); | |
119 | key = _key; | |
2106efa0 | 120 | ev_loglevel_value = event->attr.loglevel; |
18eace3b | 121 | |
1af53eb5 | 122 | /* Match the 4 elements of the key: name, filter, loglevel, exclusions */ |
18eace3b DG |
123 | |
124 | /* Event name */ | |
125 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
126 | goto no_match; | |
127 | } | |
128 | ||
129 | /* Event loglevel. */ | |
2106efa0 | 130 | if (ev_loglevel_value != key->loglevel_type) { |
025faf73 | 131 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
2106efa0 PP |
132 | && key->loglevel_type == 0 && |
133 | ev_loglevel_value == -1) { | |
025faf73 DG |
134 | /* |
135 | * Match is accepted. This is because on event creation, the | |
136 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
137 | * -1 are accepted for this loglevel type since 0 is the one set by | |
138 | * the API when receiving an enable event. | |
139 | */ | |
140 | } else { | |
141 | goto no_match; | |
142 | } | |
18eace3b DG |
143 | } |
144 | ||
145 | /* One of the filters is NULL, fail. */ | |
146 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
147 | goto no_match; | |
148 | } | |
149 | ||
025faf73 DG |
150 | if (key->filter && event->filter) { |
151 | /* Both filters exists, check length followed by the bytecode. */ | |
152 | if (event->filter->len != key->filter->len || | |
153 | memcmp(event->filter->data, key->filter->data, | |
154 | event->filter->len) != 0) { | |
155 | goto no_match; | |
156 | } | |
18eace3b DG |
157 | } |
158 | ||
1af53eb5 JI |
159 | /* One of the exclusions is NULL, fail. */ |
160 | if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) { | |
161 | goto no_match; | |
162 | } | |
163 | ||
164 | if (key->exclusion && event->exclusion) { | |
165 | /* Both exclusions exists, check count followed by the names. */ | |
166 | if (event->exclusion->count != key->exclusion->count || | |
167 | memcmp(event->exclusion->names, key->exclusion->names, | |
168 | event->exclusion->count * LTTNG_UST_SYM_NAME_LEN) != 0) { | |
169 | goto no_match; | |
170 | } | |
171 | } | |
172 | ||
173 | ||
025faf73 | 174 | /* Match. */ |
18eace3b DG |
175 | return 1; |
176 | ||
177 | no_match: | |
178 | return 0; | |
18eace3b DG |
179 | } |
180 | ||
025faf73 DG |
181 | /* |
182 | * Unique add of an ust app event in the given ht. This uses the custom | |
183 | * ht_match_ust_app_event match function and the event name as hash. | |
184 | */ | |
d0b96690 | 185 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
186 | struct ust_app_event *event) |
187 | { | |
188 | struct cds_lfht_node *node_ptr; | |
189 | struct ust_app_ht_key key; | |
d0b96690 | 190 | struct lttng_ht *ht; |
18eace3b | 191 | |
d0b96690 DG |
192 | assert(ua_chan); |
193 | assert(ua_chan->events); | |
18eace3b DG |
194 | assert(event); |
195 | ||
d0b96690 | 196 | ht = ua_chan->events; |
18eace3b DG |
197 | key.name = event->attr.name; |
198 | key.filter = event->filter; | |
2106efa0 | 199 | key.loglevel_type = event->attr.loglevel; |
91c89f23 | 200 | key.exclusion = event->exclusion; |
18eace3b DG |
201 | |
202 | node_ptr = cds_lfht_add_unique(ht->ht, | |
203 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
204 | ht_match_ust_app_event, &key, &event->node.node); | |
205 | assert(node_ptr == &event->node.node); | |
206 | } | |
207 | ||
d88aee68 DG |
208 | /* |
209 | * Close the notify socket from the given RCU head object. This MUST be called | |
210 | * through a call_rcu(). | |
211 | */ | |
212 | static void close_notify_sock_rcu(struct rcu_head *head) | |
213 | { | |
214 | int ret; | |
215 | struct ust_app_notify_sock_obj *obj = | |
216 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
217 | ||
218 | /* Must have a valid fd here. */ | |
219 | assert(obj->fd >= 0); | |
220 | ||
221 | ret = close(obj->fd); | |
222 | if (ret) { | |
223 | ERR("close notify sock %d RCU", obj->fd); | |
224 | } | |
225 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
226 | ||
227 | free(obj); | |
228 | } | |
229 | ||
7972aab2 DG |
230 | /* |
231 | * Return the session registry according to the buffer type of the given | |
232 | * session. | |
233 | * | |
234 | * A registry per UID object MUST exists before calling this function or else | |
235 | * it assert() if not found. RCU read side lock must be acquired. | |
236 | */ | |
237 | static struct ust_registry_session *get_session_registry( | |
238 | struct ust_app_session *ua_sess) | |
239 | { | |
240 | struct ust_registry_session *registry = NULL; | |
241 | ||
242 | assert(ua_sess); | |
243 | ||
244 | switch (ua_sess->buffer_type) { | |
245 | case LTTNG_BUFFER_PER_PID: | |
246 | { | |
247 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
248 | if (!reg_pid) { | |
249 | goto error; | |
250 | } | |
251 | registry = reg_pid->registry->reg.ust; | |
252 | break; | |
253 | } | |
254 | case LTTNG_BUFFER_PER_UID: | |
255 | { | |
256 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
470cc211 | 257 | ua_sess->tracing_id, ua_sess->bits_per_long, |
ff588497 | 258 | lttng_credentials_get_uid(&ua_sess->real_credentials)); |
7972aab2 DG |
259 | if (!reg_uid) { |
260 | goto error; | |
261 | } | |
262 | registry = reg_uid->registry->reg.ust; | |
263 | break; | |
264 | } | |
265 | default: | |
266 | assert(0); | |
267 | }; | |
268 | ||
269 | error: | |
270 | return registry; | |
271 | } | |
272 | ||
55cc08a6 DG |
273 | /* |
274 | * Delete ust context safely. RCU read lock must be held before calling | |
275 | * this function. | |
276 | */ | |
277 | static | |
fb45065e MD |
278 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx, |
279 | struct ust_app *app) | |
55cc08a6 | 280 | { |
ffe60014 DG |
281 | int ret; |
282 | ||
283 | assert(ua_ctx); | |
284 | ||
55cc08a6 | 285 | if (ua_ctx->obj) { |
fb45065e | 286 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 287 | ret = ustctl_release_object(sock, ua_ctx->obj); |
fb45065e | 288 | pthread_mutex_unlock(&app->sock_lock); |
d0b96690 DG |
289 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
290 | ERR("UST app sock %d release ctx obj handle %d failed with ret %d", | |
291 | sock, ua_ctx->obj->handle, ret); | |
ffe60014 | 292 | } |
55cc08a6 DG |
293 | free(ua_ctx->obj); |
294 | } | |
295 | free(ua_ctx); | |
296 | } | |
297 | ||
d80a6244 DG |
298 | /* |
299 | * Delete ust app event safely. RCU read lock must be held before calling | |
300 | * this function. | |
301 | */ | |
8b366481 | 302 | static |
fb45065e MD |
303 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event, |
304 | struct ust_app *app) | |
d80a6244 | 305 | { |
ffe60014 DG |
306 | int ret; |
307 | ||
308 | assert(ua_event); | |
309 | ||
53a80697 | 310 | free(ua_event->filter); |
951f0b71 JI |
311 | if (ua_event->exclusion != NULL) |
312 | free(ua_event->exclusion); | |
edb67388 | 313 | if (ua_event->obj != NULL) { |
fb45065e | 314 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 315 | ret = ustctl_release_object(sock, ua_event->obj); |
fb45065e | 316 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
317 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
318 | ERR("UST app sock %d release event obj failed with ret %d", | |
319 | sock, ret); | |
320 | } | |
edb67388 DG |
321 | free(ua_event->obj); |
322 | } | |
d80a6244 DG |
323 | free(ua_event); |
324 | } | |
325 | ||
993578ff JR |
326 | /* |
327 | * Delayed reclaim of a ust_app_event_notifier_rule object. This MUST be called | |
328 | * through a call_rcu(). | |
329 | */ | |
330 | static | |
331 | void free_ust_app_event_notifier_rule_rcu(struct rcu_head *head) | |
332 | { | |
333 | struct ust_app_event_notifier_rule *obj = caa_container_of( | |
334 | head, struct ust_app_event_notifier_rule, rcu_head); | |
335 | ||
336 | free(obj); | |
337 | } | |
338 | ||
339 | /* | |
340 | * Delete ust app event notifier rule safely. | |
341 | */ | |
342 | static void delete_ust_app_event_notifier_rule(int sock, | |
343 | struct ust_app_event_notifier_rule *ua_event_notifier_rule, | |
344 | struct ust_app *app) | |
345 | { | |
346 | int ret; | |
347 | ||
348 | assert(ua_event_notifier_rule); | |
349 | ||
350 | if (ua_event_notifier_rule->exclusion != NULL) { | |
351 | free(ua_event_notifier_rule->exclusion); | |
352 | } | |
353 | ||
354 | if (ua_event_notifier_rule->obj != NULL) { | |
355 | pthread_mutex_lock(&app->sock_lock); | |
356 | ret = ustctl_release_object(sock, ua_event_notifier_rule->obj); | |
357 | pthread_mutex_unlock(&app->sock_lock); | |
358 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
359 | ERR("Failed to release event notifier object: app = '%s' (ppid %d), ret = %d", | |
360 | app->name, (int) app->ppid, ret); | |
361 | } | |
362 | ||
363 | free(ua_event_notifier_rule->obj); | |
364 | } | |
365 | ||
267d66aa | 366 | lttng_trigger_put(ua_event_notifier_rule->trigger); |
993578ff JR |
367 | call_rcu(&ua_event_notifier_rule->rcu_head, |
368 | free_ust_app_event_notifier_rule_rcu); | |
369 | } | |
370 | ||
d80a6244 | 371 | /* |
7972aab2 DG |
372 | * Release ust data object of the given stream. |
373 | * | |
374 | * Return 0 on success or else a negative value. | |
d80a6244 | 375 | */ |
fb45065e MD |
376 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream, |
377 | struct ust_app *app) | |
d80a6244 | 378 | { |
7972aab2 | 379 | int ret = 0; |
ffe60014 DG |
380 | |
381 | assert(stream); | |
382 | ||
8b366481 | 383 | if (stream->obj) { |
fb45065e | 384 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 385 | ret = ustctl_release_object(sock, stream->obj); |
fb45065e | 386 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
387 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
388 | ERR("UST app sock %d release stream obj failed with ret %d", | |
389 | sock, ret); | |
390 | } | |
4063050c | 391 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
392 | free(stream->obj); |
393 | } | |
7972aab2 DG |
394 | |
395 | return ret; | |
396 | } | |
397 | ||
398 | /* | |
399 | * Delete ust app stream safely. RCU read lock must be held before calling | |
400 | * this function. | |
401 | */ | |
402 | static | |
fb45065e MD |
403 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream, |
404 | struct ust_app *app) | |
7972aab2 DG |
405 | { |
406 | assert(stream); | |
407 | ||
fb45065e | 408 | (void) release_ust_app_stream(sock, stream, app); |
84cd17c6 | 409 | free(stream); |
d80a6244 DG |
410 | } |
411 | ||
36b588ed MD |
412 | /* |
413 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
414 | * section and outside of call_rcu thread, so we postpone its execution |
415 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
416 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
417 | */ |
418 | static | |
419 | void delete_ust_app_channel_rcu(struct rcu_head *head) | |
420 | { | |
421 | struct ust_app_channel *ua_chan = | |
422 | caa_container_of(head, struct ust_app_channel, rcu_head); | |
423 | ||
0b2dc8df MD |
424 | ht_cleanup_push(ua_chan->ctx); |
425 | ht_cleanup_push(ua_chan->events); | |
36b588ed MD |
426 | free(ua_chan); |
427 | } | |
428 | ||
fb83fe64 JD |
429 | /* |
430 | * Extract the lost packet or discarded events counter when the channel is | |
431 | * being deleted and store the value in the parent channel so we can | |
432 | * access it from lttng list and at stop/destroy. | |
82cac6d2 JG |
433 | * |
434 | * The session list lock must be held by the caller. | |
fb83fe64 JD |
435 | */ |
436 | static | |
437 | void save_per_pid_lost_discarded_counters(struct ust_app_channel *ua_chan) | |
438 | { | |
439 | uint64_t discarded = 0, lost = 0; | |
440 | struct ltt_session *session; | |
441 | struct ltt_ust_channel *uchan; | |
442 | ||
443 | if (ua_chan->attr.type != LTTNG_UST_CHAN_PER_CPU) { | |
444 | return; | |
445 | } | |
446 | ||
447 | rcu_read_lock(); | |
448 | session = session_find_by_id(ua_chan->session->tracing_id); | |
d68ec974 JG |
449 | if (!session || !session->ust_session) { |
450 | /* | |
451 | * Not finding the session is not an error because there are | |
452 | * multiple ways the channels can be torn down. | |
453 | * | |
454 | * 1) The session daemon can initiate the destruction of the | |
455 | * ust app session after receiving a destroy command or | |
456 | * during its shutdown/teardown. | |
457 | * 2) The application, since we are in per-pid tracing, is | |
458 | * unregistering and tearing down its ust app session. | |
459 | * | |
460 | * Both paths are protected by the session list lock which | |
461 | * ensures that the accounting of lost packets and discarded | |
462 | * events is done exactly once. The session is then unpublished | |
463 | * from the session list, resulting in this condition. | |
464 | */ | |
fb83fe64 JD |
465 | goto end; |
466 | } | |
467 | ||
468 | if (ua_chan->attr.overwrite) { | |
469 | consumer_get_lost_packets(ua_chan->session->tracing_id, | |
470 | ua_chan->key, session->ust_session->consumer, | |
471 | &lost); | |
472 | } else { | |
473 | consumer_get_discarded_events(ua_chan->session->tracing_id, | |
474 | ua_chan->key, session->ust_session->consumer, | |
475 | &discarded); | |
476 | } | |
477 | uchan = trace_ust_find_channel_by_name( | |
478 | session->ust_session->domain_global.channels, | |
479 | ua_chan->name); | |
480 | if (!uchan) { | |
481 | ERR("Missing UST channel to store discarded counters"); | |
482 | goto end; | |
483 | } | |
484 | ||
485 | uchan->per_pid_closed_app_discarded += discarded; | |
486 | uchan->per_pid_closed_app_lost += lost; | |
487 | ||
488 | end: | |
489 | rcu_read_unlock(); | |
e32d7f27 JG |
490 | if (session) { |
491 | session_put(session); | |
492 | } | |
fb83fe64 JD |
493 | } |
494 | ||
d80a6244 DG |
495 | /* |
496 | * Delete ust app channel safely. RCU read lock must be held before calling | |
497 | * this function. | |
82cac6d2 JG |
498 | * |
499 | * The session list lock must be held by the caller. | |
d80a6244 | 500 | */ |
8b366481 | 501 | static |
d0b96690 DG |
502 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
503 | struct ust_app *app) | |
d80a6244 DG |
504 | { |
505 | int ret; | |
bec39940 | 506 | struct lttng_ht_iter iter; |
d80a6244 | 507 | struct ust_app_event *ua_event; |
55cc08a6 | 508 | struct ust_app_ctx *ua_ctx; |
030a66fa | 509 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 510 | struct ust_registry_session *registry; |
d80a6244 | 511 | |
ffe60014 DG |
512 | assert(ua_chan); |
513 | ||
514 | DBG3("UST app deleting channel %s", ua_chan->name); | |
515 | ||
55cc08a6 | 516 | /* Wipe stream */ |
d80a6244 | 517 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 518 | cds_list_del(&stream->list); |
fb45065e | 519 | delete_ust_app_stream(sock, stream, app); |
d80a6244 DG |
520 | } |
521 | ||
55cc08a6 | 522 | /* Wipe context */ |
bec39940 | 523 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
31746f93 | 524 | cds_list_del(&ua_ctx->list); |
bec39940 | 525 | ret = lttng_ht_del(ua_chan->ctx, &iter); |
55cc08a6 | 526 | assert(!ret); |
fb45065e | 527 | delete_ust_app_ctx(sock, ua_ctx, app); |
55cc08a6 | 528 | } |
d80a6244 | 529 | |
55cc08a6 | 530 | /* Wipe events */ |
bec39940 DG |
531 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
532 | node.node) { | |
533 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 534 | assert(!ret); |
fb45065e | 535 | delete_ust_app_event(sock, ua_event, app); |
d80a6244 | 536 | } |
edb67388 | 537 | |
c8335706 MD |
538 | if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) { |
539 | /* Wipe and free registry from session registry. */ | |
540 | registry = get_session_registry(ua_chan->session); | |
541 | if (registry) { | |
e9404c27 | 542 | ust_registry_channel_del_free(registry, ua_chan->key, |
e38d96f9 MD |
543 | sock >= 0); |
544 | } | |
45798a31 JG |
545 | /* |
546 | * A negative socket can be used by the caller when | |
547 | * cleaning-up a ua_chan in an error path. Skip the | |
548 | * accounting in this case. | |
549 | */ | |
e38d96f9 MD |
550 | if (sock >= 0) { |
551 | save_per_pid_lost_discarded_counters(ua_chan); | |
c8335706 | 552 | } |
7972aab2 | 553 | } |
d0b96690 | 554 | |
edb67388 | 555 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
556 | /* Remove channel from application UST object descriptor. */ |
557 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
c6e62271 DG |
558 | ret = lttng_ht_del(app->ust_objd, &iter); |
559 | assert(!ret); | |
fb45065e | 560 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 561 | ret = ustctl_release_object(sock, ua_chan->obj); |
fb45065e | 562 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
563 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
564 | ERR("UST app sock %d release channel obj failed with ret %d", | |
565 | sock, ret); | |
566 | } | |
7972aab2 | 567 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
568 | free(ua_chan->obj); |
569 | } | |
36b588ed | 570 | call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); |
d80a6244 DG |
571 | } |
572 | ||
fb45065e MD |
573 | int ust_app_register_done(struct ust_app *app) |
574 | { | |
575 | int ret; | |
576 | ||
577 | pthread_mutex_lock(&app->sock_lock); | |
578 | ret = ustctl_register_done(app->sock); | |
579 | pthread_mutex_unlock(&app->sock_lock); | |
580 | return ret; | |
581 | } | |
582 | ||
583 | int ust_app_release_object(struct ust_app *app, struct lttng_ust_object_data *data) | |
584 | { | |
585 | int ret, sock; | |
586 | ||
587 | if (app) { | |
588 | pthread_mutex_lock(&app->sock_lock); | |
589 | sock = app->sock; | |
590 | } else { | |
591 | sock = -1; | |
592 | } | |
593 | ret = ustctl_release_object(sock, data); | |
594 | if (app) { | |
595 | pthread_mutex_unlock(&app->sock_lock); | |
596 | } | |
597 | return ret; | |
598 | } | |
599 | ||
331744e3 | 600 | /* |
1b532a60 DG |
601 | * Push metadata to consumer socket. |
602 | * | |
dc2bbdae MD |
603 | * RCU read-side lock must be held to guarantee existance of socket. |
604 | * Must be called with the ust app session lock held. | |
605 | * Must be called with the registry lock held. | |
331744e3 JD |
606 | * |
607 | * On success, return the len of metadata pushed or else a negative value. | |
2c57e06d MD |
608 | * Returning a -EPIPE return value means we could not send the metadata, |
609 | * but it can be caused by recoverable errors (e.g. the application has | |
610 | * terminated concurrently). | |
331744e3 JD |
611 | */ |
612 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
613 | struct consumer_socket *socket, int send_zero_data) | |
614 | { | |
615 | int ret; | |
616 | char *metadata_str = NULL; | |
c585821b | 617 | size_t len, offset, new_metadata_len_sent; |
331744e3 | 618 | ssize_t ret_val; |
93ec662e | 619 | uint64_t metadata_key, metadata_version; |
331744e3 JD |
620 | |
621 | assert(registry); | |
622 | assert(socket); | |
1b532a60 | 623 | |
c585821b MD |
624 | metadata_key = registry->metadata_key; |
625 | ||
ce34fcd0 | 626 | /* |
dc2bbdae MD |
627 | * Means that no metadata was assigned to the session. This can |
628 | * happens if no start has been done previously. | |
ce34fcd0 | 629 | */ |
c585821b | 630 | if (!metadata_key) { |
ce34fcd0 MD |
631 | return 0; |
632 | } | |
633 | ||
331744e3 JD |
634 | offset = registry->metadata_len_sent; |
635 | len = registry->metadata_len - registry->metadata_len_sent; | |
c585821b | 636 | new_metadata_len_sent = registry->metadata_len; |
93ec662e | 637 | metadata_version = registry->metadata_version; |
331744e3 JD |
638 | if (len == 0) { |
639 | DBG3("No metadata to push for metadata key %" PRIu64, | |
640 | registry->metadata_key); | |
641 | ret_val = len; | |
642 | if (send_zero_data) { | |
643 | DBG("No metadata to push"); | |
644 | goto push_data; | |
645 | } | |
646 | goto end; | |
647 | } | |
648 | ||
649 | /* Allocate only what we have to send. */ | |
650 | metadata_str = zmalloc(len); | |
651 | if (!metadata_str) { | |
652 | PERROR("zmalloc ust app metadata string"); | |
653 | ret_val = -ENOMEM; | |
654 | goto error; | |
655 | } | |
c585821b | 656 | /* Copy what we haven't sent out. */ |
331744e3 | 657 | memcpy(metadata_str, registry->metadata + offset, len); |
331744e3 JD |
658 | |
659 | push_data: | |
c585821b MD |
660 | pthread_mutex_unlock(®istry->lock); |
661 | /* | |
662 | * We need to unlock the registry while we push metadata to | |
663 | * break a circular dependency between the consumerd metadata | |
664 | * lock and the sessiond registry lock. Indeed, pushing metadata | |
665 | * to the consumerd awaits that it gets pushed all the way to | |
666 | * relayd, but doing so requires grabbing the metadata lock. If | |
667 | * a concurrent metadata request is being performed by | |
668 | * consumerd, this can try to grab the registry lock on the | |
669 | * sessiond while holding the metadata lock on the consumer | |
670 | * daemon. Those push and pull schemes are performed on two | |
671 | * different bidirectionnal communication sockets. | |
672 | */ | |
673 | ret = consumer_push_metadata(socket, metadata_key, | |
93ec662e | 674 | metadata_str, len, offset, metadata_version); |
c585821b | 675 | pthread_mutex_lock(®istry->lock); |
331744e3 | 676 | if (ret < 0) { |
000baf6a | 677 | /* |
dc2bbdae MD |
678 | * There is an acceptable race here between the registry |
679 | * metadata key assignment and the creation on the | |
680 | * consumer. The session daemon can concurrently push | |
681 | * metadata for this registry while being created on the | |
682 | * consumer since the metadata key of the registry is | |
683 | * assigned *before* it is setup to avoid the consumer | |
684 | * to ask for metadata that could possibly be not found | |
685 | * in the session daemon. | |
000baf6a | 686 | * |
dc2bbdae MD |
687 | * The metadata will get pushed either by the session |
688 | * being stopped or the consumer requesting metadata if | |
689 | * that race is triggered. | |
000baf6a DG |
690 | */ |
691 | if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) { | |
692 | ret = 0; | |
c585821b MD |
693 | } else { |
694 | ERR("Error pushing metadata to consumer"); | |
000baf6a | 695 | } |
331744e3 JD |
696 | ret_val = ret; |
697 | goto error_push; | |
c585821b MD |
698 | } else { |
699 | /* | |
700 | * Metadata may have been concurrently pushed, since | |
701 | * we're not holding the registry lock while pushing to | |
702 | * consumer. This is handled by the fact that we send | |
703 | * the metadata content, size, and the offset at which | |
704 | * that metadata belongs. This may arrive out of order | |
705 | * on the consumer side, and the consumer is able to | |
706 | * deal with overlapping fragments. The consumer | |
707 | * supports overlapping fragments, which must be | |
708 | * contiguous starting from offset 0. We keep the | |
709 | * largest metadata_len_sent value of the concurrent | |
710 | * send. | |
711 | */ | |
712 | registry->metadata_len_sent = | |
713 | max_t(size_t, registry->metadata_len_sent, | |
714 | new_metadata_len_sent); | |
331744e3 | 715 | } |
331744e3 JD |
716 | free(metadata_str); |
717 | return len; | |
718 | ||
719 | end: | |
720 | error: | |
ce34fcd0 MD |
721 | if (ret_val) { |
722 | /* | |
dc2bbdae MD |
723 | * On error, flag the registry that the metadata is |
724 | * closed. We were unable to push anything and this | |
725 | * means that either the consumer is not responding or | |
726 | * the metadata cache has been destroyed on the | |
727 | * consumer. | |
ce34fcd0 MD |
728 | */ |
729 | registry->metadata_closed = 1; | |
730 | } | |
331744e3 JD |
731 | error_push: |
732 | free(metadata_str); | |
733 | return ret_val; | |
734 | } | |
735 | ||
d88aee68 | 736 | /* |
ce34fcd0 | 737 | * For a given application and session, push metadata to consumer. |
331744e3 JD |
738 | * Either sock or consumer is required : if sock is NULL, the default |
739 | * socket to send the metadata is retrieved from consumer, if sock | |
740 | * is not NULL we use it to send the metadata. | |
ce34fcd0 | 741 | * RCU read-side lock must be held while calling this function, |
dc2bbdae MD |
742 | * therefore ensuring existance of registry. It also ensures existance |
743 | * of socket throughout this function. | |
d88aee68 DG |
744 | * |
745 | * Return 0 on success else a negative error. | |
2c57e06d MD |
746 | * Returning a -EPIPE return value means we could not send the metadata, |
747 | * but it can be caused by recoverable errors (e.g. the application has | |
748 | * terminated concurrently). | |
d88aee68 | 749 | */ |
7972aab2 DG |
750 | static int push_metadata(struct ust_registry_session *registry, |
751 | struct consumer_output *consumer) | |
d88aee68 | 752 | { |
331744e3 JD |
753 | int ret_val; |
754 | ssize_t ret; | |
d88aee68 DG |
755 | struct consumer_socket *socket; |
756 | ||
7972aab2 DG |
757 | assert(registry); |
758 | assert(consumer); | |
759 | ||
ce34fcd0 | 760 | pthread_mutex_lock(®istry->lock); |
ce34fcd0 | 761 | if (registry->metadata_closed) { |
dc2bbdae MD |
762 | ret_val = -EPIPE; |
763 | goto error; | |
d88aee68 DG |
764 | } |
765 | ||
d88aee68 | 766 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
767 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
768 | consumer); | |
d88aee68 | 769 | if (!socket) { |
331744e3 | 770 | ret_val = -1; |
ce34fcd0 | 771 | goto error; |
d88aee68 DG |
772 | } |
773 | ||
331744e3 | 774 | ret = ust_app_push_metadata(registry, socket, 0); |
d88aee68 | 775 | if (ret < 0) { |
331744e3 | 776 | ret_val = ret; |
ce34fcd0 | 777 | goto error; |
d88aee68 | 778 | } |
dc2bbdae | 779 | pthread_mutex_unlock(®istry->lock); |
d88aee68 DG |
780 | return 0; |
781 | ||
ce34fcd0 | 782 | error: |
dc2bbdae | 783 | pthread_mutex_unlock(®istry->lock); |
331744e3 | 784 | return ret_val; |
d88aee68 DG |
785 | } |
786 | ||
787 | /* | |
788 | * Send to the consumer a close metadata command for the given session. Once | |
789 | * done, the metadata channel is deleted and the session metadata pointer is | |
dc2bbdae | 790 | * nullified. The session lock MUST be held unless the application is |
d88aee68 DG |
791 | * in the destroy path. |
792 | * | |
a70ac2f4 MD |
793 | * Do not hold the registry lock while communicating with the consumerd, because |
794 | * doing so causes inter-process deadlocks between consumerd and sessiond with | |
795 | * the metadata request notification. | |
796 | * | |
d88aee68 DG |
797 | * Return 0 on success else a negative value. |
798 | */ | |
7972aab2 DG |
799 | static int close_metadata(struct ust_registry_session *registry, |
800 | struct consumer_output *consumer) | |
d88aee68 DG |
801 | { |
802 | int ret; | |
803 | struct consumer_socket *socket; | |
a70ac2f4 MD |
804 | uint64_t metadata_key; |
805 | bool registry_was_already_closed; | |
d88aee68 | 806 | |
7972aab2 DG |
807 | assert(registry); |
808 | assert(consumer); | |
d88aee68 | 809 | |
7972aab2 DG |
810 | rcu_read_lock(); |
811 | ||
ce34fcd0 | 812 | pthread_mutex_lock(®istry->lock); |
a70ac2f4 MD |
813 | metadata_key = registry->metadata_key; |
814 | registry_was_already_closed = registry->metadata_closed; | |
815 | if (metadata_key != 0) { | |
816 | /* | |
817 | * Metadata closed. Even on error this means that the consumer | |
818 | * is not responding or not found so either way a second close | |
819 | * should NOT be emit for this registry. | |
820 | */ | |
821 | registry->metadata_closed = 1; | |
822 | } | |
823 | pthread_mutex_unlock(®istry->lock); | |
ce34fcd0 | 824 | |
a70ac2f4 | 825 | if (metadata_key == 0 || registry_was_already_closed) { |
d88aee68 | 826 | ret = 0; |
1b532a60 | 827 | goto end; |
d88aee68 DG |
828 | } |
829 | ||
d88aee68 | 830 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
831 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
832 | consumer); | |
d88aee68 DG |
833 | if (!socket) { |
834 | ret = -1; | |
a70ac2f4 | 835 | goto end; |
d88aee68 DG |
836 | } |
837 | ||
a70ac2f4 | 838 | ret = consumer_close_metadata(socket, metadata_key); |
d88aee68 | 839 | if (ret < 0) { |
a70ac2f4 | 840 | goto end; |
d88aee68 DG |
841 | } |
842 | ||
1b532a60 | 843 | end: |
7972aab2 | 844 | rcu_read_unlock(); |
d88aee68 DG |
845 | return ret; |
846 | } | |
847 | ||
36b588ed MD |
848 | /* |
849 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
850 | * section and outside of call_rcu thread, so we postpone its execution |
851 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
852 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
853 | */ |
854 | static | |
855 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
856 | { | |
857 | struct ust_app_session *ua_sess = | |
858 | caa_container_of(head, struct ust_app_session, rcu_head); | |
859 | ||
0b2dc8df | 860 | ht_cleanup_push(ua_sess->channels); |
36b588ed MD |
861 | free(ua_sess); |
862 | } | |
863 | ||
d80a6244 DG |
864 | /* |
865 | * Delete ust app session safely. RCU read lock must be held before calling | |
866 | * this function. | |
82cac6d2 JG |
867 | * |
868 | * The session list lock must be held by the caller. | |
d80a6244 | 869 | */ |
8b366481 | 870 | static |
d0b96690 DG |
871 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
872 | struct ust_app *app) | |
d80a6244 DG |
873 | { |
874 | int ret; | |
bec39940 | 875 | struct lttng_ht_iter iter; |
d80a6244 | 876 | struct ust_app_channel *ua_chan; |
7972aab2 | 877 | struct ust_registry_session *registry; |
d80a6244 | 878 | |
d88aee68 DG |
879 | assert(ua_sess); |
880 | ||
1b532a60 DG |
881 | pthread_mutex_lock(&ua_sess->lock); |
882 | ||
b161602a MD |
883 | assert(!ua_sess->deleted); |
884 | ua_sess->deleted = true; | |
885 | ||
7972aab2 | 886 | registry = get_session_registry(ua_sess); |
fad1ed2f | 887 | /* Registry can be null on error path during initialization. */ |
ce34fcd0 | 888 | if (registry) { |
d88aee68 | 889 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 890 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 891 | |
7972aab2 DG |
892 | /* |
893 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
894 | * metadata only on destroy trace session in this case. Also, the |
895 | * previous push metadata could have flag the metadata registry to | |
896 | * close so don't send a close command if closed. | |
7972aab2 | 897 | */ |
ce34fcd0 | 898 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
899 | /* And ask to close it for this session registry. */ |
900 | (void) close_metadata(registry, ua_sess->consumer); | |
901 | } | |
d80a6244 DG |
902 | } |
903 | ||
bec39940 DG |
904 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
905 | node.node) { | |
906 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 907 | assert(!ret); |
d0b96690 | 908 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 909 | } |
d80a6244 | 910 | |
7972aab2 DG |
911 | /* In case of per PID, the registry is kept in the session. */ |
912 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
913 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
914 | if (reg_pid) { | |
fad1ed2f JR |
915 | /* |
916 | * Registry can be null on error path during | |
917 | * initialization. | |
918 | */ | |
7972aab2 DG |
919 | buffer_reg_pid_remove(reg_pid); |
920 | buffer_reg_pid_destroy(reg_pid); | |
921 | } | |
922 | } | |
d0b96690 | 923 | |
aee6bafd | 924 | if (ua_sess->handle != -1) { |
fb45065e | 925 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 926 | ret = ustctl_release_handle(sock, ua_sess->handle); |
fb45065e | 927 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
928 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
929 | ERR("UST app sock %d release session handle failed with ret %d", | |
930 | sock, ret); | |
931 | } | |
10b56aef MD |
932 | /* Remove session from application UST object descriptor. */ |
933 | iter.iter.node = &ua_sess->ust_objd_node.node; | |
934 | ret = lttng_ht_del(app->ust_sessions_objd, &iter); | |
935 | assert(!ret); | |
aee6bafd | 936 | } |
10b56aef | 937 | |
1b532a60 DG |
938 | pthread_mutex_unlock(&ua_sess->lock); |
939 | ||
6addfa37 MD |
940 | consumer_output_put(ua_sess->consumer); |
941 | ||
36b588ed | 942 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 943 | } |
91d76f53 DG |
944 | |
945 | /* | |
284d8f55 DG |
946 | * Delete a traceable application structure from the global list. Never call |
947 | * this function outside of a call_rcu call. | |
36b588ed MD |
948 | * |
949 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 950 | */ |
8b366481 DG |
951 | static |
952 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 953 | { |
8b366481 | 954 | int ret, sock; |
d42f20df | 955 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
993578ff JR |
956 | struct lttng_ht_iter iter; |
957 | struct ust_app_event_notifier_rule *event_notifier_rule; | |
5e2abfaf | 958 | bool event_notifier_write_fd_is_open; |
44d3bd01 | 959 | |
82cac6d2 JG |
960 | /* |
961 | * The session list lock must be held during this function to guarantee | |
962 | * the existence of ua_sess. | |
963 | */ | |
964 | session_lock_list(); | |
d80a6244 | 965 | /* Delete ust app sessions info */ |
852d0037 DG |
966 | sock = app->sock; |
967 | app->sock = -1; | |
d80a6244 | 968 | |
8b366481 | 969 | /* Wipe sessions */ |
d42f20df DG |
970 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
971 | teardown_node) { | |
972 | /* Free every object in the session and the session. */ | |
36b588ed | 973 | rcu_read_lock(); |
d0b96690 | 974 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 975 | rcu_read_unlock(); |
d80a6244 | 976 | } |
36b588ed | 977 | |
993578ff JR |
978 | /* Remove the event notifier rules associated with this app. */ |
979 | rcu_read_lock(); | |
980 | cds_lfht_for_each_entry (app->token_to_event_notifier_rule_ht->ht, | |
981 | &iter.iter, event_notifier_rule, node.node) { | |
982 | ret = lttng_ht_del(app->token_to_event_notifier_rule_ht, &iter); | |
983 | assert(!ret); | |
984 | ||
985 | delete_ust_app_event_notifier_rule( | |
986 | app->sock, event_notifier_rule, app); | |
987 | } | |
988 | ||
989 | rcu_read_unlock(); | |
990 | ||
0b2dc8df | 991 | ht_cleanup_push(app->sessions); |
10b56aef | 992 | ht_cleanup_push(app->ust_sessions_objd); |
0b2dc8df | 993 | ht_cleanup_push(app->ust_objd); |
993578ff | 994 | ht_cleanup_push(app->token_to_event_notifier_rule_ht); |
d80a6244 | 995 | |
da873412 JR |
996 | /* |
997 | * This could be NULL if the event notifier setup failed (e.g the app | |
998 | * was killed or the tracer does not support this feature). | |
999 | */ | |
1000 | if (app->event_notifier_group.object) { | |
1001 | enum lttng_error_code ret_code; | |
1002 | const int event_notifier_read_fd = lttng_pipe_get_readfd( | |
1003 | app->event_notifier_group.event_pipe); | |
1004 | ||
1005 | ret_code = notification_thread_command_remove_tracer_event_source( | |
1006 | notification_thread_handle, | |
1007 | event_notifier_read_fd); | |
1008 | if (ret_code != LTTNG_OK) { | |
1009 | ERR("Failed to remove application tracer event source from notification thread"); | |
1010 | } | |
1011 | ||
1012 | ustctl_release_object(sock, app->event_notifier_group.object); | |
1013 | free(app->event_notifier_group.object); | |
1014 | } | |
1015 | ||
5e2abfaf JG |
1016 | event_notifier_write_fd_is_open = lttng_pipe_is_write_open( |
1017 | app->event_notifier_group.event_pipe); | |
da873412 | 1018 | lttng_pipe_destroy(app->event_notifier_group.event_pipe); |
5e2abfaf JG |
1019 | /* |
1020 | * Release the file descriptors reserved for the event notifier pipe. | |
1021 | * The app could be destroyed before the write end of the pipe could be | |
1022 | * passed to the application (and closed). In that case, both file | |
1023 | * descriptors must be released. | |
1024 | */ | |
1025 | lttng_fd_put(LTTNG_FD_APPS, event_notifier_write_fd_is_open ? 2 : 1); | |
da873412 | 1026 | |
6414a713 | 1027 | /* |
852d0037 DG |
1028 | * Wait until we have deleted the application from the sock hash table |
1029 | * before closing this socket, otherwise an application could re-use the | |
1030 | * socket ID and race with the teardown, using the same hash table entry. | |
1031 | * | |
1032 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
1033 | * all RCU readers that could run concurrently with unregister app, | |
1034 | * therefore we _need_ to only close that socket after a grace period. So | |
1035 | * it should stay in this RCU callback. | |
1036 | * | |
1037 | * This close() is a very important step of the synchronization model so | |
1038 | * every modification to this function must be carefully reviewed. | |
6414a713 | 1039 | */ |
799e2c4f MD |
1040 | ret = close(sock); |
1041 | if (ret) { | |
1042 | PERROR("close"); | |
1043 | } | |
4063050c | 1044 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 1045 | |
852d0037 | 1046 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 1047 | free(app); |
82cac6d2 | 1048 | session_unlock_list(); |
099e26bd DG |
1049 | } |
1050 | ||
1051 | /* | |
f6a9efaa | 1052 | * URCU intermediate call to delete an UST app. |
099e26bd | 1053 | */ |
8b366481 DG |
1054 | static |
1055 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 1056 | { |
bec39940 DG |
1057 | struct lttng_ht_node_ulong *node = |
1058 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 1059 | struct ust_app *app = |
852d0037 | 1060 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 1061 | |
852d0037 | 1062 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 1063 | delete_ust_app(app); |
099e26bd DG |
1064 | } |
1065 | ||
ffe60014 DG |
1066 | /* |
1067 | * Delete the session from the application ht and delete the data structure by | |
1068 | * freeing every object inside and releasing them. | |
82cac6d2 JG |
1069 | * |
1070 | * The session list lock must be held by the caller. | |
ffe60014 | 1071 | */ |
d0b96690 | 1072 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
1073 | struct ust_app_session *ua_sess) |
1074 | { | |
1075 | int ret; | |
1076 | struct lttng_ht_iter iter; | |
1077 | ||
1078 | assert(app); | |
1079 | assert(ua_sess); | |
1080 | ||
1081 | iter.iter.node = &ua_sess->node.node; | |
1082 | ret = lttng_ht_del(app->sessions, &iter); | |
1083 | if (ret) { | |
1084 | /* Already scheduled for teardown. */ | |
1085 | goto end; | |
1086 | } | |
1087 | ||
1088 | /* Once deleted, free the data structure. */ | |
d0b96690 | 1089 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
1090 | |
1091 | end: | |
1092 | return; | |
1093 | } | |
1094 | ||
8b366481 DG |
1095 | /* |
1096 | * Alloc new UST app session. | |
1097 | */ | |
1098 | static | |
40bbd087 | 1099 | struct ust_app_session *alloc_ust_app_session(void) |
8b366481 DG |
1100 | { |
1101 | struct ust_app_session *ua_sess; | |
1102 | ||
1103 | /* Init most of the default value by allocating and zeroing */ | |
1104 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
1105 | if (ua_sess == NULL) { | |
1106 | PERROR("malloc"); | |
ffe60014 | 1107 | goto error_free; |
8b366481 DG |
1108 | } |
1109 | ||
1110 | ua_sess->handle = -1; | |
bec39940 | 1111 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
ad7a9107 | 1112 | ua_sess->metadata_attr.type = LTTNG_UST_CHAN_METADATA; |
84ad93e8 | 1113 | pthread_mutex_init(&ua_sess->lock, NULL); |
ad7a9107 | 1114 | |
8b366481 DG |
1115 | return ua_sess; |
1116 | ||
ffe60014 | 1117 | error_free: |
8b366481 DG |
1118 | return NULL; |
1119 | } | |
1120 | ||
1121 | /* | |
1122 | * Alloc new UST app channel. | |
1123 | */ | |
1124 | static | |
b53d4e59 | 1125 | struct ust_app_channel *alloc_ust_app_channel(const char *name, |
d0b96690 | 1126 | struct ust_app_session *ua_sess, |
ffe60014 | 1127 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
1128 | { |
1129 | struct ust_app_channel *ua_chan; | |
1130 | ||
1131 | /* Init most of the default value by allocating and zeroing */ | |
1132 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
1133 | if (ua_chan == NULL) { | |
1134 | PERROR("malloc"); | |
1135 | goto error; | |
1136 | } | |
1137 | ||
1138 | /* Setup channel name */ | |
1139 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
1140 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
1141 | ||
1142 | ua_chan->enabled = 1; | |
1143 | ua_chan->handle = -1; | |
45893984 | 1144 | ua_chan->session = ua_sess; |
ffe60014 | 1145 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
1146 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
1147 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
1148 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
1149 | |
1150 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
31746f93 | 1151 | CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); |
8b366481 DG |
1152 | |
1153 | /* Copy attributes */ | |
1154 | if (attr) { | |
ffe60014 | 1155 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
1156 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
1157 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
1158 | ua_chan->attr.overwrite = attr->overwrite; | |
1159 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
1160 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
1161 | ua_chan->attr.output = attr->output; | |
491d1539 | 1162 | ua_chan->attr.blocking_timeout = attr->u.s.blocking_timeout; |
8b366481 | 1163 | } |
ffe60014 DG |
1164 | /* By default, the channel is a per cpu channel. */ |
1165 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
1166 | |
1167 | DBG3("UST app channel %s allocated", ua_chan->name); | |
1168 | ||
1169 | return ua_chan; | |
1170 | ||
1171 | error: | |
1172 | return NULL; | |
1173 | } | |
1174 | ||
37f1c236 DG |
1175 | /* |
1176 | * Allocate and initialize a UST app stream. | |
1177 | * | |
1178 | * Return newly allocated stream pointer or NULL on error. | |
1179 | */ | |
ffe60014 | 1180 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
1181 | { |
1182 | struct ust_app_stream *stream = NULL; | |
1183 | ||
1184 | stream = zmalloc(sizeof(*stream)); | |
1185 | if (stream == NULL) { | |
1186 | PERROR("zmalloc ust app stream"); | |
1187 | goto error; | |
1188 | } | |
1189 | ||
1190 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
1191 | stream->handle = -1; | |
1192 | ||
1193 | error: | |
1194 | return stream; | |
1195 | } | |
1196 | ||
8b366481 DG |
1197 | /* |
1198 | * Alloc new UST app event. | |
1199 | */ | |
1200 | static | |
1201 | struct ust_app_event *alloc_ust_app_event(char *name, | |
1202 | struct lttng_ust_event *attr) | |
1203 | { | |
1204 | struct ust_app_event *ua_event; | |
1205 | ||
1206 | /* Init most of the default value by allocating and zeroing */ | |
1207 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
1208 | if (ua_event == NULL) { | |
20533947 | 1209 | PERROR("Failed to allocate ust_app_event structure"); |
8b366481 DG |
1210 | goto error; |
1211 | } | |
1212 | ||
1213 | ua_event->enabled = 1; | |
1214 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
1215 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 1216 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
1217 | |
1218 | /* Copy attributes */ | |
1219 | if (attr) { | |
1220 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
1221 | } | |
1222 | ||
1223 | DBG3("UST app event %s allocated", ua_event->name); | |
1224 | ||
1225 | return ua_event; | |
1226 | ||
1227 | error: | |
1228 | return NULL; | |
1229 | } | |
1230 | ||
993578ff JR |
1231 | /* |
1232 | * Allocate a new UST app event notifier rule. | |
1233 | */ | |
1234 | static struct ust_app_event_notifier_rule *alloc_ust_app_event_notifier_rule( | |
267d66aa | 1235 | struct lttng_trigger *trigger) |
993578ff JR |
1236 | { |
1237 | enum lttng_event_rule_generate_exclusions_status | |
1238 | generate_exclusion_status; | |
1239 | struct ust_app_event_notifier_rule *ua_event_notifier_rule; | |
267d66aa JR |
1240 | struct lttng_condition *condition = NULL; |
1241 | const struct lttng_event_rule *event_rule = NULL; | |
993578ff JR |
1242 | |
1243 | ua_event_notifier_rule = zmalloc(sizeof(struct ust_app_event_notifier_rule)); | |
1244 | if (ua_event_notifier_rule == NULL) { | |
1245 | PERROR("Failed to allocate ust_app_event_notifier_rule structure"); | |
1246 | goto error; | |
1247 | } | |
1248 | ||
1249 | ua_event_notifier_rule->enabled = 1; | |
267d66aa JR |
1250 | ua_event_notifier_rule->token = lttng_trigger_get_tracer_token(trigger); |
1251 | lttng_ht_node_init_u64(&ua_event_notifier_rule->node, | |
1252 | ua_event_notifier_rule->token); | |
993578ff | 1253 | |
267d66aa JR |
1254 | condition = lttng_trigger_get_condition(trigger); |
1255 | assert(condition); | |
1256 | assert(lttng_condition_get_type(condition) == LTTNG_CONDITION_TYPE_EVENT_RULE_HIT); | |
1257 | ||
1258 | assert(LTTNG_CONDITION_STATUS_OK == lttng_condition_event_rule_get_rule(condition, &event_rule)); | |
1259 | assert(event_rule); | |
993578ff | 1260 | |
267d66aa JR |
1261 | /* Acquire the event notifier's reference to the trigger. */ |
1262 | lttng_trigger_get(trigger); | |
1263 | ||
1264 | ua_event_notifier_rule->trigger = trigger; | |
993578ff JR |
1265 | ua_event_notifier_rule->filter = lttng_event_rule_get_filter_bytecode(event_rule); |
1266 | generate_exclusion_status = lttng_event_rule_generate_exclusions( | |
1267 | event_rule, &ua_event_notifier_rule->exclusion); | |
1268 | switch (generate_exclusion_status) { | |
1269 | case LTTNG_EVENT_RULE_GENERATE_EXCLUSIONS_STATUS_OK: | |
1270 | case LTTNG_EVENT_RULE_GENERATE_EXCLUSIONS_STATUS_NONE: | |
1271 | break; | |
1272 | default: | |
1273 | /* Error occured. */ | |
267d66aa JR |
1274 | ERR("Failed to generate exclusions from trigger while allocating an event notifier rule"); |
1275 | goto error_put_trigger; | |
993578ff JR |
1276 | } |
1277 | ||
1278 | DBG3("UST app event notifier rule allocated: token = %" PRIu64, | |
1279 | ua_event_notifier_rule->token); | |
1280 | ||
1281 | return ua_event_notifier_rule; | |
1282 | ||
267d66aa JR |
1283 | error_put_trigger: |
1284 | lttng_trigger_put(trigger); | |
993578ff JR |
1285 | error: |
1286 | free(ua_event_notifier_rule); | |
1287 | return NULL; | |
1288 | } | |
1289 | ||
8b366481 DG |
1290 | /* |
1291 | * Alloc new UST app context. | |
1292 | */ | |
1293 | static | |
bdf64013 | 1294 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context_attr *uctx) |
8b366481 DG |
1295 | { |
1296 | struct ust_app_ctx *ua_ctx; | |
1297 | ||
1298 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
1299 | if (ua_ctx == NULL) { | |
1300 | goto error; | |
1301 | } | |
1302 | ||
31746f93 DG |
1303 | CDS_INIT_LIST_HEAD(&ua_ctx->list); |
1304 | ||
8b366481 DG |
1305 | if (uctx) { |
1306 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
bdf64013 | 1307 | if (uctx->ctx == LTTNG_UST_CONTEXT_APP_CONTEXT) { |
f3db82be | 1308 | char *provider_name = NULL, *ctx_name = NULL; |
bdf64013 JG |
1309 | |
1310 | provider_name = strdup(uctx->u.app_ctx.provider_name); | |
1311 | ctx_name = strdup(uctx->u.app_ctx.ctx_name); | |
1312 | if (!provider_name || !ctx_name) { | |
1313 | free(provider_name); | |
1314 | free(ctx_name); | |
1315 | goto error; | |
1316 | } | |
1317 | ||
1318 | ua_ctx->ctx.u.app_ctx.provider_name = provider_name; | |
1319 | ua_ctx->ctx.u.app_ctx.ctx_name = ctx_name; | |
1320 | } | |
8b366481 DG |
1321 | } |
1322 | ||
1323 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
8b366481 | 1324 | return ua_ctx; |
bdf64013 JG |
1325 | error: |
1326 | free(ua_ctx); | |
1327 | return NULL; | |
8b366481 DG |
1328 | } |
1329 | ||
51755dc8 JG |
1330 | /* |
1331 | * Create a liblttng-ust filter bytecode from given bytecode. | |
1332 | * | |
1333 | * Return allocated filter or NULL on error. | |
1334 | */ | |
f2eafd2d JR |
1335 | static struct lttng_ust_filter_bytecode * |
1336 | create_ust_filter_bytecode_from_bytecode(const struct lttng_bytecode *orig_f) | |
51755dc8 JG |
1337 | { |
1338 | struct lttng_ust_filter_bytecode *filter = NULL; | |
1339 | ||
f2eafd2d | 1340 | /* Copy filter bytecode. */ |
51755dc8 JG |
1341 | filter = zmalloc(sizeof(*filter) + orig_f->len); |
1342 | if (!filter) { | |
f2eafd2d | 1343 | PERROR("Failed to allocate lttng_ust_filter_bytecode: bytecode len = %" PRIu32 " bytes", orig_f->len); |
51755dc8 JG |
1344 | goto error; |
1345 | } | |
1346 | ||
2b00d462 | 1347 | assert(sizeof(struct lttng_bytecode) == |
51755dc8 JG |
1348 | sizeof(struct lttng_ust_filter_bytecode)); |
1349 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
1350 | error: | |
1351 | return filter; | |
1352 | } | |
1353 | ||
f2eafd2d JR |
1354 | /* |
1355 | * Create a liblttng-ust capture bytecode from given bytecode. | |
1356 | * | |
1357 | * Return allocated filter or NULL on error. | |
1358 | */ | |
1359 | static struct lttng_ust_capture_bytecode * | |
1360 | create_ust_capture_bytecode_from_bytecode(const struct lttng_bytecode *orig_f) | |
1361 | { | |
1362 | struct lttng_ust_capture_bytecode *capture = NULL; | |
1363 | ||
1364 | /* Copy capture bytecode. */ | |
1365 | capture = zmalloc(sizeof(*capture) + orig_f->len); | |
1366 | if (!capture) { | |
1367 | PERROR("Failed to allocate lttng_ust_capture_bytecode: bytecode len = %" PRIu32 " bytes", orig_f->len); | |
1368 | goto error; | |
1369 | } | |
1370 | ||
1371 | assert(sizeof(struct lttng_bytecode) == | |
1372 | sizeof(struct lttng_ust_capture_bytecode)); | |
1373 | memcpy(capture, orig_f, sizeof(*capture) + orig_f->len); | |
1374 | error: | |
1375 | return capture; | |
1376 | } | |
1377 | ||
099e26bd | 1378 | /* |
421cb601 DG |
1379 | * Find an ust_app using the sock and return it. RCU read side lock must be |
1380 | * held before calling this helper function. | |
099e26bd | 1381 | */ |
f20baf8e | 1382 | struct ust_app *ust_app_find_by_sock(int sock) |
099e26bd | 1383 | { |
bec39940 | 1384 | struct lttng_ht_node_ulong *node; |
bec39940 | 1385 | struct lttng_ht_iter iter; |
f6a9efaa | 1386 | |
852d0037 | 1387 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 1388 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
1389 | if (node == NULL) { |
1390 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
1391 | goto error; |
1392 | } | |
852d0037 DG |
1393 | |
1394 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
1395 | |
1396 | error: | |
1397 | return NULL; | |
099e26bd DG |
1398 | } |
1399 | ||
d0b96690 DG |
1400 | /* |
1401 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
1402 | * be held before calling this helper function. | |
1403 | */ | |
1404 | static struct ust_app *find_app_by_notify_sock(int sock) | |
1405 | { | |
1406 | struct lttng_ht_node_ulong *node; | |
1407 | struct lttng_ht_iter iter; | |
1408 | ||
1409 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
1410 | &iter); | |
1411 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1412 | if (node == NULL) { | |
1413 | DBG2("UST app find by notify sock %d not found", sock); | |
1414 | goto error; | |
1415 | } | |
1416 | ||
1417 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
1418 | ||
1419 | error: | |
1420 | return NULL; | |
1421 | } | |
1422 | ||
025faf73 DG |
1423 | /* |
1424 | * Lookup for an ust app event based on event name, filter bytecode and the | |
1425 | * event loglevel. | |
1426 | * | |
1427 | * Return an ust_app_event object or NULL on error. | |
1428 | */ | |
18eace3b | 1429 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
2b00d462 | 1430 | const char *name, const struct lttng_bytecode *filter, |
2106efa0 | 1431 | int loglevel_value, |
39c5a3a7 | 1432 | const struct lttng_event_exclusion *exclusion) |
18eace3b DG |
1433 | { |
1434 | struct lttng_ht_iter iter; | |
1435 | struct lttng_ht_node_str *node; | |
1436 | struct ust_app_event *event = NULL; | |
1437 | struct ust_app_ht_key key; | |
18eace3b DG |
1438 | |
1439 | assert(name); | |
1440 | assert(ht); | |
1441 | ||
1442 | /* Setup key for event lookup. */ | |
1443 | key.name = name; | |
1444 | key.filter = filter; | |
2106efa0 | 1445 | key.loglevel_type = loglevel_value; |
39c5a3a7 | 1446 | /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */ |
51755dc8 | 1447 | key.exclusion = exclusion; |
18eace3b | 1448 | |
025faf73 DG |
1449 | /* Lookup using the event name as hash and a custom match fct. */ |
1450 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1451 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1452 | node = lttng_ht_iter_get_node_str(&iter); |
1453 | if (node == NULL) { | |
1454 | goto end; | |
1455 | } | |
1456 | ||
1457 | event = caa_container_of(node, struct ust_app_event, node); | |
1458 | ||
1459 | end: | |
18eace3b DG |
1460 | return event; |
1461 | } | |
1462 | ||
993578ff JR |
1463 | /* |
1464 | * Look-up an event notifier rule based on its token id. | |
1465 | * | |
1466 | * Must be called with the RCU read lock held. | |
1467 | * Return an ust_app_event_notifier_rule object or NULL on error. | |
1468 | */ | |
1469 | static struct ust_app_event_notifier_rule *find_ust_app_event_notifier_rule( | |
1470 | struct lttng_ht *ht, uint64_t token) | |
1471 | { | |
1472 | struct lttng_ht_iter iter; | |
1473 | struct lttng_ht_node_u64 *node; | |
1474 | struct ust_app_event_notifier_rule *event_notifier_rule = NULL; | |
1475 | ||
1476 | assert(ht); | |
1477 | ||
1478 | lttng_ht_lookup(ht, &token, &iter); | |
1479 | node = lttng_ht_iter_get_node_u64(&iter); | |
1480 | if (node == NULL) { | |
1481 | DBG2("UST app event notifier rule token not found: token = %" PRIu64, | |
1482 | token); | |
1483 | goto end; | |
1484 | } | |
1485 | ||
1486 | event_notifier_rule = caa_container_of( | |
1487 | node, struct ust_app_event_notifier_rule, node); | |
1488 | end: | |
1489 | return event_notifier_rule; | |
1490 | } | |
1491 | ||
55cc08a6 DG |
1492 | /* |
1493 | * Create the channel context on the tracer. | |
d0b96690 DG |
1494 | * |
1495 | * Called with UST app session lock held. | |
55cc08a6 DG |
1496 | */ |
1497 | static | |
1498 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1499 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1500 | { | |
1501 | int ret; | |
1502 | ||
840cb59c | 1503 | health_code_update(); |
86acf0da | 1504 | |
fb45065e | 1505 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1506 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 | 1507 | ua_chan->obj, &ua_ctx->obj); |
fb45065e | 1508 | pthread_mutex_unlock(&app->sock_lock); |
55cc08a6 | 1509 | if (ret < 0) { |
ffe60014 DG |
1510 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1511 | ERR("UST app create channel context failed for app (pid: %d) " | |
1512 | "with ret %d", app->pid, ret); | |
1513 | } else { | |
3757b385 DG |
1514 | /* |
1515 | * This is normal behavior, an application can die during the | |
1516 | * creation process. Don't report an error so the execution can | |
1517 | * continue normally. | |
1518 | */ | |
1519 | ret = 0; | |
88e3c2f5 | 1520 | DBG3("UST app add context failed. Application is dead."); |
ffe60014 | 1521 | } |
55cc08a6 DG |
1522 | goto error; |
1523 | } | |
1524 | ||
1525 | ua_ctx->handle = ua_ctx->obj->handle; | |
1526 | ||
d0b96690 DG |
1527 | DBG2("UST app context handle %d created successfully for channel %s", |
1528 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1529 | |
1530 | error: | |
840cb59c | 1531 | health_code_update(); |
55cc08a6 DG |
1532 | return ret; |
1533 | } | |
1534 | ||
53a80697 MD |
1535 | /* |
1536 | * Set the filter on the tracer. | |
1537 | */ | |
a154c7b8 | 1538 | static int set_ust_object_filter(struct ust_app *app, |
2b00d462 | 1539 | const struct lttng_bytecode *bytecode, |
a154c7b8 | 1540 | struct lttng_ust_object_data *ust_object) |
53a80697 MD |
1541 | { |
1542 | int ret; | |
51755dc8 | 1543 | struct lttng_ust_filter_bytecode *ust_bytecode = NULL; |
53a80697 | 1544 | |
840cb59c | 1545 | health_code_update(); |
86acf0da | 1546 | |
f2eafd2d | 1547 | ust_bytecode = create_ust_filter_bytecode_from_bytecode(bytecode); |
51755dc8 JG |
1548 | if (!ust_bytecode) { |
1549 | ret = -LTTNG_ERR_NOMEM; | |
1550 | goto error; | |
1551 | } | |
fb45065e | 1552 | pthread_mutex_lock(&app->sock_lock); |
51755dc8 | 1553 | ret = ustctl_set_filter(app->sock, ust_bytecode, |
a154c7b8 | 1554 | ust_object); |
fb45065e | 1555 | pthread_mutex_unlock(&app->sock_lock); |
53a80697 | 1556 | if (ret < 0) { |
ffe60014 | 1557 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
f2eafd2d JR |
1558 | ERR("UST app set object filter failed: object = %p of app pid = %d, ret = %d", |
1559 | ust_object, app->pid, ret); | |
ffe60014 | 1560 | } else { |
3757b385 DG |
1561 | /* |
1562 | * This is normal behavior, an application can die during the | |
1563 | * creation process. Don't report an error so the execution can | |
1564 | * continue normally. | |
1565 | */ | |
1566 | ret = 0; | |
a154c7b8 | 1567 | DBG3("Failed to set UST app object filter. Application is dead."); |
ffe60014 | 1568 | } |
53a80697 MD |
1569 | goto error; |
1570 | } | |
1571 | ||
f2eafd2d JR |
1572 | DBG2("UST filter successfully set: object = %p", ust_object); |
1573 | ||
1574 | error: | |
1575 | health_code_update(); | |
1576 | free(ust_bytecode); | |
1577 | return ret; | |
1578 | } | |
1579 | ||
1580 | /* | |
1581 | * Set a capture bytecode for the passed object. | |
1582 | */ | |
1583 | static int set_ust_capture(struct ust_app *app, | |
1584 | const struct lttng_bytecode *bytecode, | |
1585 | struct lttng_ust_object_data *ust_object) | |
1586 | { | |
1587 | int ret; | |
1588 | struct lttng_ust_capture_bytecode *ust_bytecode = NULL; | |
1589 | ||
1590 | health_code_update(); | |
1591 | ||
1592 | ust_bytecode = create_ust_capture_bytecode_from_bytecode(bytecode); | |
1593 | if (!ust_bytecode) { | |
1594 | ret = -LTTNG_ERR_NOMEM; | |
1595 | goto error; | |
1596 | } | |
1597 | ||
1598 | pthread_mutex_lock(&app->sock_lock); | |
1599 | ret = ustctl_set_capture(app->sock, ust_bytecode, | |
1600 | ust_object); | |
1601 | pthread_mutex_unlock(&app->sock_lock); | |
1602 | if (ret < 0) { | |
1603 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1604 | ERR("UST app set object capture failed: object = %p of app pid = %d, ret = %d", | |
1605 | ust_object, app->pid, ret); | |
1606 | } else { | |
1607 | /* | |
1608 | * This is normal behavior, an application can die during the | |
1609 | * creation process. Don't report an error so the execution can | |
1610 | * continue normally. | |
1611 | */ | |
1612 | ret = 0; | |
1613 | DBG3("Failed to set UST app object capture. Application is dead."); | |
1614 | } | |
1615 | ||
1616 | goto error; | |
1617 | } | |
1618 | ||
1619 | DBG2("UST capture successfully set: object = %p", ust_object); | |
53a80697 MD |
1620 | |
1621 | error: | |
840cb59c | 1622 | health_code_update(); |
51755dc8 | 1623 | free(ust_bytecode); |
53a80697 MD |
1624 | return ret; |
1625 | } | |
1626 | ||
51755dc8 JG |
1627 | static |
1628 | struct lttng_ust_event_exclusion *create_ust_exclusion_from_exclusion( | |
c0901ffa | 1629 | const struct lttng_event_exclusion *exclusion) |
51755dc8 JG |
1630 | { |
1631 | struct lttng_ust_event_exclusion *ust_exclusion = NULL; | |
1632 | size_t exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) + | |
1633 | LTTNG_UST_SYM_NAME_LEN * exclusion->count; | |
1634 | ||
1635 | ust_exclusion = zmalloc(exclusion_alloc_size); | |
1636 | if (!ust_exclusion) { | |
1637 | PERROR("malloc"); | |
1638 | goto end; | |
1639 | } | |
1640 | ||
1641 | assert(sizeof(struct lttng_event_exclusion) == | |
1642 | sizeof(struct lttng_ust_event_exclusion)); | |
1643 | memcpy(ust_exclusion, exclusion, exclusion_alloc_size); | |
1644 | end: | |
1645 | return ust_exclusion; | |
1646 | } | |
1647 | ||
7cc9a73c JI |
1648 | /* |
1649 | * Set event exclusions on the tracer. | |
1650 | */ | |
c0901ffa JR |
1651 | static int set_ust_object_exclusions(struct ust_app *app, |
1652 | const struct lttng_event_exclusion *exclusions, | |
1653 | struct lttng_ust_object_data *ust_object) | |
7cc9a73c JI |
1654 | { |
1655 | int ret; | |
c0901ffa | 1656 | struct lttng_ust_event_exclusion *ust_exclusions = NULL; |
7cc9a73c | 1657 | |
c0901ffa | 1658 | assert(exclusions && exclusions->count > 0); |
7cc9a73c | 1659 | |
c0901ffa | 1660 | health_code_update(); |
7cc9a73c | 1661 | |
c0901ffa JR |
1662 | ust_exclusions = create_ust_exclusion_from_exclusion( |
1663 | exclusions); | |
1664 | if (!ust_exclusions) { | |
51755dc8 JG |
1665 | ret = -LTTNG_ERR_NOMEM; |
1666 | goto error; | |
1667 | } | |
fb45065e | 1668 | pthread_mutex_lock(&app->sock_lock); |
c0901ffa | 1669 | ret = ustctl_set_exclusion(app->sock, ust_exclusions, ust_object); |
fb45065e | 1670 | pthread_mutex_unlock(&app->sock_lock); |
7cc9a73c JI |
1671 | if (ret < 0) { |
1672 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
c0901ffa JR |
1673 | ERR("Failed to set UST app exclusions for object %p of app (pid: %d) " |
1674 | "with ret %d", ust_object, app->pid, ret); | |
7cc9a73c JI |
1675 | } else { |
1676 | /* | |
1677 | * This is normal behavior, an application can die during the | |
1678 | * creation process. Don't report an error so the execution can | |
1679 | * continue normally. | |
1680 | */ | |
1681 | ret = 0; | |
c0901ffa | 1682 | DBG3("Failed to set UST app object exclusions. Application is dead."); |
7cc9a73c JI |
1683 | } |
1684 | goto error; | |
1685 | } | |
1686 | ||
c0901ffa | 1687 | DBG2("UST exclusions set successfully for object %p", ust_object); |
7cc9a73c JI |
1688 | |
1689 | error: | |
1690 | health_code_update(); | |
c0901ffa | 1691 | free(ust_exclusions); |
7cc9a73c JI |
1692 | return ret; |
1693 | } | |
1694 | ||
9730260e DG |
1695 | /* |
1696 | * Disable the specified event on to UST tracer for the UST session. | |
1697 | */ | |
e2456d0a JR |
1698 | static int disable_ust_object(struct ust_app *app, |
1699 | struct lttng_ust_object_data *object) | |
9730260e DG |
1700 | { |
1701 | int ret; | |
1702 | ||
840cb59c | 1703 | health_code_update(); |
86acf0da | 1704 | |
fb45065e | 1705 | pthread_mutex_lock(&app->sock_lock); |
e2456d0a | 1706 | ret = ustctl_disable(app->sock, object); |
fb45065e | 1707 | pthread_mutex_unlock(&app->sock_lock); |
9730260e | 1708 | if (ret < 0) { |
ffe60014 | 1709 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
e2456d0a JR |
1710 | ERR("Failed to disable UST app object %p app (pid: %d) with ret %d", |
1711 | object, app->pid, ret); | |
ffe60014 | 1712 | } else { |
3757b385 DG |
1713 | /* |
1714 | * This is normal behavior, an application can die during the | |
1715 | * creation process. Don't report an error so the execution can | |
1716 | * continue normally. | |
1717 | */ | |
1718 | ret = 0; | |
e2456d0a | 1719 | DBG3("Failed to disable UST app object. Application is dead."); |
ffe60014 | 1720 | } |
9730260e DG |
1721 | goto error; |
1722 | } | |
1723 | ||
e2456d0a JR |
1724 | DBG2("UST app object %p disabled successfully for app (pid: %d)", |
1725 | object, app->pid); | |
9730260e DG |
1726 | |
1727 | error: | |
840cb59c | 1728 | health_code_update(); |
9730260e DG |
1729 | return ret; |
1730 | } | |
1731 | ||
78f0bacd DG |
1732 | /* |
1733 | * Disable the specified channel on to UST tracer for the UST session. | |
1734 | */ | |
1735 | static int disable_ust_channel(struct ust_app *app, | |
1736 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1737 | { | |
1738 | int ret; | |
1739 | ||
840cb59c | 1740 | health_code_update(); |
86acf0da | 1741 | |
fb45065e | 1742 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1743 | ret = ustctl_disable(app->sock, ua_chan->obj); |
fb45065e | 1744 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1745 | if (ret < 0) { |
ffe60014 DG |
1746 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1747 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1748 | "and session handle %d with ret %d", | |
1749 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1750 | } else { | |
3757b385 DG |
1751 | /* |
1752 | * This is normal behavior, an application can die during the | |
1753 | * creation process. Don't report an error so the execution can | |
1754 | * continue normally. | |
1755 | */ | |
1756 | ret = 0; | |
ffe60014 DG |
1757 | DBG3("UST app disable channel failed. Application is dead."); |
1758 | } | |
78f0bacd DG |
1759 | goto error; |
1760 | } | |
1761 | ||
78f0bacd | 1762 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1763 | ua_chan->name, app->pid); |
78f0bacd DG |
1764 | |
1765 | error: | |
840cb59c | 1766 | health_code_update(); |
78f0bacd DG |
1767 | return ret; |
1768 | } | |
1769 | ||
1770 | /* | |
1771 | * Enable the specified channel on to UST tracer for the UST session. | |
1772 | */ | |
1773 | static int enable_ust_channel(struct ust_app *app, | |
1774 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1775 | { | |
1776 | int ret; | |
1777 | ||
840cb59c | 1778 | health_code_update(); |
86acf0da | 1779 | |
fb45065e | 1780 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1781 | ret = ustctl_enable(app->sock, ua_chan->obj); |
fb45065e | 1782 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1783 | if (ret < 0) { |
ffe60014 DG |
1784 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1785 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1786 | "and session handle %d with ret %d", | |
1787 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1788 | } else { | |
3757b385 DG |
1789 | /* |
1790 | * This is normal behavior, an application can die during the | |
1791 | * creation process. Don't report an error so the execution can | |
1792 | * continue normally. | |
1793 | */ | |
1794 | ret = 0; | |
ffe60014 DG |
1795 | DBG3("UST app enable channel failed. Application is dead."); |
1796 | } | |
78f0bacd DG |
1797 | goto error; |
1798 | } | |
1799 | ||
1800 | ua_chan->enabled = 1; | |
1801 | ||
1802 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1803 | ua_chan->name, app->pid); |
78f0bacd DG |
1804 | |
1805 | error: | |
840cb59c | 1806 | health_code_update(); |
78f0bacd DG |
1807 | return ret; |
1808 | } | |
1809 | ||
edb67388 DG |
1810 | /* |
1811 | * Enable the specified event on to UST tracer for the UST session. | |
1812 | */ | |
3428a1b7 JR |
1813 | static int enable_ust_object( |
1814 | struct ust_app *app, struct lttng_ust_object_data *ust_object) | |
edb67388 DG |
1815 | { |
1816 | int ret; | |
1817 | ||
840cb59c | 1818 | health_code_update(); |
86acf0da | 1819 | |
fb45065e | 1820 | pthread_mutex_lock(&app->sock_lock); |
3428a1b7 | 1821 | ret = ustctl_enable(app->sock, ust_object); |
fb45065e | 1822 | pthread_mutex_unlock(&app->sock_lock); |
edb67388 | 1823 | if (ret < 0) { |
ffe60014 | 1824 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3428a1b7 JR |
1825 | ERR("UST app enable failed for object %p app (pid: %d) with ret %d", |
1826 | ust_object, app->pid, ret); | |
ffe60014 | 1827 | } else { |
3757b385 DG |
1828 | /* |
1829 | * This is normal behavior, an application can die during the | |
1830 | * creation process. Don't report an error so the execution can | |
1831 | * continue normally. | |
1832 | */ | |
1833 | ret = 0; | |
3428a1b7 | 1834 | DBG3("Failed to enable UST app object. Application is dead."); |
ffe60014 | 1835 | } |
edb67388 DG |
1836 | goto error; |
1837 | } | |
1838 | ||
3428a1b7 JR |
1839 | DBG2("UST app object %p enabled successfully for app (pid: %d)", |
1840 | ust_object, app->pid); | |
edb67388 DG |
1841 | |
1842 | error: | |
840cb59c | 1843 | health_code_update(); |
edb67388 DG |
1844 | return ret; |
1845 | } | |
1846 | ||
099e26bd | 1847 | /* |
7972aab2 | 1848 | * Send channel and stream buffer to application. |
4f3ab6ee | 1849 | * |
ffe60014 | 1850 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1851 | */ |
7972aab2 DG |
1852 | static int send_channel_pid_to_ust(struct ust_app *app, |
1853 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1854 | { |
1855 | int ret; | |
ffe60014 | 1856 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1857 | |
1858 | assert(app); | |
ffe60014 | 1859 | assert(ua_sess); |
4f3ab6ee | 1860 | assert(ua_chan); |
4f3ab6ee | 1861 | |
840cb59c | 1862 | health_code_update(); |
4f3ab6ee | 1863 | |
7972aab2 DG |
1864 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1865 | app->sock); | |
86acf0da | 1866 | |
ffe60014 DG |
1867 | /* Send channel to the application. */ |
1868 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
1869 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1870 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1871 | goto error; | |
1872 | } else if (ret < 0) { | |
b551a063 DG |
1873 | goto error; |
1874 | } | |
1875 | ||
d88aee68 DG |
1876 | health_code_update(); |
1877 | ||
ffe60014 DG |
1878 | /* Send all streams to application. */ |
1879 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1880 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
a7169585 MD |
1881 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1882 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1883 | goto error; | |
1884 | } else if (ret < 0) { | |
ffe60014 DG |
1885 | goto error; |
1886 | } | |
1887 | /* We don't need the stream anymore once sent to the tracer. */ | |
1888 | cds_list_del(&stream->list); | |
fb45065e | 1889 | delete_ust_app_stream(-1, stream, app); |
ffe60014 | 1890 | } |
ffe60014 DG |
1891 | /* Flag the channel that it is sent to the application. */ |
1892 | ua_chan->is_sent = 1; | |
ffe60014 | 1893 | |
b551a063 | 1894 | error: |
840cb59c | 1895 | health_code_update(); |
b551a063 DG |
1896 | return ret; |
1897 | } | |
1898 | ||
91d76f53 | 1899 | /* |
5b4a0ec0 | 1900 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1901 | * |
1902 | * Should be called with session mutex held. | |
91d76f53 | 1903 | */ |
edb67388 DG |
1904 | static |
1905 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1906 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1907 | { |
5b4a0ec0 | 1908 | int ret = 0; |
284d8f55 | 1909 | |
840cb59c | 1910 | health_code_update(); |
86acf0da | 1911 | |
5b4a0ec0 | 1912 | /* Create UST event on tracer */ |
fb45065e | 1913 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1914 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 | 1915 | &ua_event->obj); |
fb45065e | 1916 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 | 1917 | if (ret < 0) { |
ffe60014 | 1918 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
88e3c2f5 | 1919 | abort(); |
ffe60014 DG |
1920 | ERR("Error ustctl create event %s for app pid: %d with ret %d", |
1921 | ua_event->attr.name, app->pid, ret); | |
1922 | } else { | |
3757b385 DG |
1923 | /* |
1924 | * This is normal behavior, an application can die during the | |
1925 | * creation process. Don't report an error so the execution can | |
1926 | * continue normally. | |
1927 | */ | |
1928 | ret = 0; | |
ffe60014 DG |
1929 | DBG3("UST app create event failed. Application is dead."); |
1930 | } | |
5b4a0ec0 | 1931 | goto error; |
91d76f53 | 1932 | } |
f6a9efaa | 1933 | |
5b4a0ec0 | 1934 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1935 | |
3428a1b7 JR |
1936 | DBG2("UST app event %s created successfully for pid:%d object: %p", |
1937 | ua_event->attr.name, app->pid, ua_event->obj); | |
f6a9efaa | 1938 | |
840cb59c | 1939 | health_code_update(); |
86acf0da | 1940 | |
025faf73 DG |
1941 | /* Set filter if one is present. */ |
1942 | if (ua_event->filter) { | |
a154c7b8 | 1943 | ret = set_ust_object_filter(app, ua_event->filter, ua_event->obj); |
025faf73 DG |
1944 | if (ret < 0) { |
1945 | goto error; | |
1946 | } | |
1947 | } | |
1948 | ||
7cc9a73c JI |
1949 | /* Set exclusions for the event */ |
1950 | if (ua_event->exclusion) { | |
c0901ffa | 1951 | ret = set_ust_object_exclusions(app, ua_event->exclusion, ua_event->obj); |
7cc9a73c JI |
1952 | if (ret < 0) { |
1953 | goto error; | |
1954 | } | |
1955 | } | |
1956 | ||
8535a6d9 | 1957 | /* If event not enabled, disable it on the tracer */ |
40113787 MD |
1958 | if (ua_event->enabled) { |
1959 | /* | |
1960 | * We now need to explicitly enable the event, since it | |
1961 | * is now disabled at creation. | |
1962 | */ | |
3428a1b7 | 1963 | ret = enable_ust_object(app, ua_event->obj); |
40113787 MD |
1964 | if (ret < 0) { |
1965 | /* | |
1966 | * If we hit an EPERM, something is wrong with our enable call. If | |
1967 | * we get an EEXIST, there is a problem on the tracer side since we | |
1968 | * just created it. | |
1969 | */ | |
1970 | switch (ret) { | |
1971 | case -LTTNG_UST_ERR_PERM: | |
1972 | /* Code flow problem */ | |
1973 | assert(0); | |
1974 | case -LTTNG_UST_ERR_EXIST: | |
1975 | /* It's OK for our use case. */ | |
1976 | ret = 0; | |
1977 | break; | |
1978 | default: | |
1979 | break; | |
1980 | } | |
1981 | goto error; | |
1982 | } | |
8535a6d9 DG |
1983 | } |
1984 | ||
5b4a0ec0 | 1985 | error: |
840cb59c | 1986 | health_code_update(); |
5b4a0ec0 | 1987 | return ret; |
91d76f53 | 1988 | } |
48842b30 | 1989 | |
993578ff JR |
1990 | static int init_ust_event_notifier_from_event_rule( |
1991 | const struct lttng_event_rule *rule, | |
1992 | struct lttng_ust_event_notifier *event_notifier) | |
1993 | { | |
1994 | enum lttng_event_rule_status status; | |
1995 | enum lttng_loglevel_type loglevel_type; | |
1996 | enum lttng_ust_loglevel_type ust_loglevel_type = LTTNG_UST_LOGLEVEL_ALL; | |
1997 | int loglevel = -1, ret = 0; | |
1998 | const char *pattern; | |
1999 | ||
2000 | /* For now only LTTNG_EVENT_RULE_TYPE_TRACEPOINT are supported. */ | |
2001 | assert(lttng_event_rule_get_type(rule) == | |
2002 | LTTNG_EVENT_RULE_TYPE_TRACEPOINT); | |
2003 | ||
2004 | memset(event_notifier, 0, sizeof(*event_notifier)); | |
2005 | ||
44760c20 JR |
2006 | if (lttng_event_rule_targets_agent_domain(rule)) { |
2007 | /* | |
2008 | * Special event for agents | |
2009 | * The actual meat of the event is in the filter that will be | |
2010 | * attached later on. | |
2011 | * Set the default values for the agent event. | |
2012 | */ | |
2013 | pattern = event_get_default_agent_ust_name( | |
2014 | lttng_event_rule_get_domain_type(rule)); | |
2015 | loglevel = 0; | |
2016 | ust_loglevel_type = LTTNG_UST_LOGLEVEL_ALL; | |
2017 | } else { | |
2018 | status = lttng_event_rule_tracepoint_get_pattern( | |
2019 | rule, &pattern); | |
2020 | if (status != LTTNG_EVENT_RULE_STATUS_OK) { | |
2021 | /* At this point, this is a fatal error. */ | |
2022 | abort(); | |
2023 | } | |
993578ff | 2024 | |
44760c20 JR |
2025 | status = lttng_event_rule_tracepoint_get_log_level_type( |
2026 | rule, &loglevel_type); | |
2027 | if (status != LTTNG_EVENT_RULE_STATUS_OK) { | |
2028 | /* At this point, this is a fatal error. */ | |
2029 | abort(); | |
2030 | } | |
993578ff | 2031 | |
44760c20 JR |
2032 | switch (loglevel_type) { |
2033 | case LTTNG_EVENT_LOGLEVEL_ALL: | |
2034 | ust_loglevel_type = LTTNG_UST_LOGLEVEL_ALL; | |
2035 | break; | |
2036 | case LTTNG_EVENT_LOGLEVEL_RANGE: | |
2037 | ust_loglevel_type = LTTNG_UST_LOGLEVEL_RANGE; | |
2038 | break; | |
2039 | case LTTNG_EVENT_LOGLEVEL_SINGLE: | |
2040 | ust_loglevel_type = LTTNG_UST_LOGLEVEL_SINGLE; | |
2041 | break; | |
2042 | default: | |
2043 | /* Unknown log level specification type. */ | |
2044 | abort(); | |
2045 | } | |
993578ff | 2046 | |
44760c20 JR |
2047 | if (loglevel_type != LTTNG_EVENT_LOGLEVEL_ALL) { |
2048 | status = lttng_event_rule_tracepoint_get_log_level( | |
2049 | rule, &loglevel); | |
2050 | assert(status == LTTNG_EVENT_RULE_STATUS_OK); | |
2051 | } | |
993578ff JR |
2052 | } |
2053 | ||
2054 | event_notifier->event.instrumentation = LTTNG_UST_TRACEPOINT; | |
2055 | ret = lttng_strncpy(event_notifier->event.name, pattern, | |
44760c20 | 2056 | LTTNG_UST_SYM_NAME_LEN - 1); |
993578ff JR |
2057 | if (ret) { |
2058 | ERR("Failed to copy event rule pattern to notifier: pattern = '%s' ", | |
2059 | pattern); | |
2060 | goto end; | |
2061 | } | |
2062 | ||
2063 | event_notifier->event.loglevel_type = ust_loglevel_type; | |
2064 | event_notifier->event.loglevel = loglevel; | |
2065 | end: | |
2066 | return ret; | |
2067 | } | |
2068 | ||
2069 | /* | |
2070 | * Create the specified event notifier against the user space tracer of a | |
2071 | * given application. | |
2072 | */ | |
2073 | static int create_ust_event_notifier(struct ust_app *app, | |
2074 | struct ust_app_event_notifier_rule *ua_event_notifier_rule) | |
2075 | { | |
2076 | int ret = 0; | |
267d66aa JR |
2077 | enum lttng_condition_status condition_status; |
2078 | const struct lttng_condition *condition = NULL; | |
993578ff | 2079 | struct lttng_ust_event_notifier event_notifier; |
267d66aa | 2080 | const struct lttng_event_rule *event_rule = NULL; |
f83be61d JR |
2081 | unsigned int capture_bytecode_count = 0, i; |
2082 | enum lttng_condition_status cond_status; | |
993578ff JR |
2083 | |
2084 | health_code_update(); | |
2085 | assert(app->event_notifier_group.object); | |
2086 | ||
267d66aa JR |
2087 | condition = lttng_trigger_get_const_condition( |
2088 | ua_event_notifier_rule->trigger); | |
2089 | assert(condition); | |
2090 | assert(lttng_condition_get_type(condition) == LTTNG_CONDITION_TYPE_EVENT_RULE_HIT); | |
993578ff | 2091 | |
267d66aa JR |
2092 | condition_status = lttng_condition_event_rule_get_rule(condition, &event_rule); |
2093 | assert(condition_status == LTTNG_CONDITION_STATUS_OK); | |
2094 | assert(event_rule); | |
2095 | assert(lttng_event_rule_get_type(event_rule) == LTTNG_EVENT_RULE_TYPE_TRACEPOINT); | |
2096 | ||
2097 | init_ust_event_notifier_from_event_rule(event_rule, &event_notifier); | |
993578ff JR |
2098 | event_notifier.event.token = ua_event_notifier_rule->token; |
2099 | ||
2100 | /* Create UST event notifier against the tracer. */ | |
2101 | pthread_mutex_lock(&app->sock_lock); | |
2102 | ret = ustctl_create_event_notifier(app->sock, &event_notifier, | |
2103 | app->event_notifier_group.object, | |
2104 | &ua_event_notifier_rule->obj); | |
2105 | pthread_mutex_unlock(&app->sock_lock); | |
2106 | if (ret < 0) { | |
2107 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
2108 | ERR("Error ustctl create event notifier: name = '%s', app = '%s' (ppid: %d), ret = %d", | |
2109 | event_notifier.event.name, app->name, | |
2110 | app->ppid, ret); | |
2111 | } else { | |
2112 | /* | |
2113 | * This is normal behavior, an application can die | |
2114 | * during the creation process. Don't report an error so | |
2115 | * the execution can continue normally. | |
2116 | */ | |
2117 | ret = 0; | |
2118 | DBG3("UST app create event notifier failed (application is dead): app = '%s' (ppid = %d)", | |
2119 | app->name, app->ppid); | |
2120 | } | |
2121 | ||
2122 | goto error; | |
2123 | } | |
2124 | ||
2125 | ua_event_notifier_rule->handle = ua_event_notifier_rule->obj->handle; | |
2126 | ||
2127 | DBG2("UST app event notifier %s created successfully: app = '%s' (ppid: %d), object: %p", | |
2128 | event_notifier.event.name, app->name, app->ppid, | |
2129 | ua_event_notifier_rule->obj); | |
2130 | ||
2131 | health_code_update(); | |
2132 | ||
2133 | /* Set filter if one is present. */ | |
2134 | if (ua_event_notifier_rule->filter) { | |
2135 | ret = set_ust_object_filter(app, ua_event_notifier_rule->filter, | |
2136 | ua_event_notifier_rule->obj); | |
2137 | if (ret < 0) { | |
2138 | goto error; | |
2139 | } | |
2140 | } | |
2141 | ||
2142 | /* Set exclusions for the event. */ | |
2143 | if (ua_event_notifier_rule->exclusion) { | |
2144 | ret = set_ust_object_exclusions(app, | |
2145 | ua_event_notifier_rule->exclusion, | |
2146 | ua_event_notifier_rule->obj); | |
2147 | if (ret < 0) { | |
2148 | goto error; | |
2149 | } | |
2150 | } | |
f83be61d JR |
2151 | |
2152 | /* Set the capture bytecodes. */ | |
2153 | cond_status = lttng_condition_event_rule_get_capture_descriptor_count( | |
2154 | condition, &capture_bytecode_count); | |
2155 | assert(cond_status == LTTNG_CONDITION_STATUS_OK); | |
2156 | ||
2157 | for (i = 0; i < capture_bytecode_count; i++) { | |
2158 | const struct lttng_bytecode *capture_bytecode = | |
2159 | lttng_condition_event_rule_get_capture_bytecode_at_index( | |
2160 | condition, i); | |
2161 | ||
2162 | ret = set_ust_capture(app, capture_bytecode, | |
2163 | ua_event_notifier_rule->obj); | |
2164 | if (ret < 0) { | |
2165 | goto error; | |
2166 | } | |
2167 | } | |
993578ff JR |
2168 | |
2169 | /* | |
2170 | * We now need to explicitly enable the event, since it | |
2171 | * is disabled at creation. | |
2172 | */ | |
2173 | ret = enable_ust_object(app, ua_event_notifier_rule->obj); | |
2174 | if (ret < 0) { | |
2175 | /* | |
2176 | * If we hit an EPERM, something is wrong with our enable call. | |
2177 | * If we get an EEXIST, there is a problem on the tracer side | |
2178 | * since we just created it. | |
2179 | */ | |
2180 | switch (ret) { | |
2181 | case -LTTNG_UST_ERR_PERM: | |
2182 | /* Code flow problem. */ | |
2183 | abort(); | |
2184 | case -LTTNG_UST_ERR_EXIST: | |
2185 | /* It's OK for our use case. */ | |
2186 | ret = 0; | |
2187 | break; | |
2188 | default: | |
2189 | break; | |
2190 | } | |
2191 | ||
2192 | goto error; | |
2193 | } | |
2194 | ||
2195 | ua_event_notifier_rule->enabled = true; | |
2196 | ||
2197 | error: | |
2198 | health_code_update(); | |
2199 | return ret; | |
2200 | } | |
2201 | ||
5b4a0ec0 DG |
2202 | /* |
2203 | * Copy data between an UST app event and a LTT event. | |
2204 | */ | |
421cb601 | 2205 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
2206 | struct ltt_ust_event *uevent) |
2207 | { | |
b4ffad32 JI |
2208 | size_t exclusion_alloc_size; |
2209 | ||
48842b30 DG |
2210 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); |
2211 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
2212 | ||
fc34caaa DG |
2213 | ua_event->enabled = uevent->enabled; |
2214 | ||
5b4a0ec0 DG |
2215 | /* Copy event attributes */ |
2216 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
2217 | ||
53a80697 MD |
2218 | /* Copy filter bytecode */ |
2219 | if (uevent->filter) { | |
2b00d462 | 2220 | ua_event->filter = lttng_bytecode_copy(uevent->filter); |
025faf73 | 2221 | /* Filter might be NULL here in case of ENONEM. */ |
53a80697 | 2222 | } |
b4ffad32 JI |
2223 | |
2224 | /* Copy exclusion data */ | |
2225 | if (uevent->exclusion) { | |
51755dc8 | 2226 | exclusion_alloc_size = sizeof(struct lttng_event_exclusion) + |
b4ffad32 JI |
2227 | LTTNG_UST_SYM_NAME_LEN * uevent->exclusion->count; |
2228 | ua_event->exclusion = zmalloc(exclusion_alloc_size); | |
5f8df26c JI |
2229 | if (ua_event->exclusion == NULL) { |
2230 | PERROR("malloc"); | |
2231 | } else { | |
2232 | memcpy(ua_event->exclusion, uevent->exclusion, | |
2233 | exclusion_alloc_size); | |
b4ffad32 JI |
2234 | } |
2235 | } | |
48842b30 DG |
2236 | } |
2237 | ||
5b4a0ec0 DG |
2238 | /* |
2239 | * Copy data between an UST app channel and a LTT channel. | |
2240 | */ | |
421cb601 | 2241 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
2242 | struct ltt_ust_channel *uchan) |
2243 | { | |
fc34caaa | 2244 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
2245 | |
2246 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
2247 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 2248 | |
1624d5b7 JD |
2249 | ua_chan->tracefile_size = uchan->tracefile_size; |
2250 | ua_chan->tracefile_count = uchan->tracefile_count; | |
2251 | ||
ffe60014 DG |
2252 | /* Copy event attributes since the layout is different. */ |
2253 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
2254 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
2255 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
2256 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
2257 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
e9404c27 | 2258 | ua_chan->monitor_timer_interval = uchan->monitor_timer_interval; |
ffe60014 | 2259 | ua_chan->attr.output = uchan->attr.output; |
491d1539 MD |
2260 | ua_chan->attr.blocking_timeout = uchan->attr.u.s.blocking_timeout; |
2261 | ||
ffe60014 DG |
2262 | /* |
2263 | * Note that the attribute channel type is not set since the channel on the | |
2264 | * tracing registry side does not have this information. | |
2265 | */ | |
48842b30 | 2266 | |
fc34caaa | 2267 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 2268 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 2269 | |
fc34caaa | 2270 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
2271 | } |
2272 | ||
5b4a0ec0 DG |
2273 | /* |
2274 | * Copy data between a UST app session and a regular LTT session. | |
2275 | */ | |
421cb601 | 2276 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 2277 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 2278 | { |
477d7741 MD |
2279 | struct tm *timeinfo; |
2280 | char datetime[16]; | |
2281 | int ret; | |
d7ba1388 | 2282 | char tmp_shm_path[PATH_MAX]; |
477d7741 | 2283 | |
940c4592 | 2284 | timeinfo = localtime(&app->registration_time); |
477d7741 | 2285 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); |
48842b30 | 2286 | |
421cb601 | 2287 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 2288 | |
7972aab2 DG |
2289 | ua_sess->tracing_id = usess->id; |
2290 | ua_sess->id = get_next_session_id(); | |
ff588497 JR |
2291 | LTTNG_OPTIONAL_SET(&ua_sess->real_credentials.uid, app->uid); |
2292 | LTTNG_OPTIONAL_SET(&ua_sess->real_credentials.gid, app->gid); | |
2293 | LTTNG_OPTIONAL_SET(&ua_sess->effective_credentials.uid, usess->uid); | |
2294 | LTTNG_OPTIONAL_SET(&ua_sess->effective_credentials.gid, usess->gid); | |
7972aab2 DG |
2295 | ua_sess->buffer_type = usess->buffer_type; |
2296 | ua_sess->bits_per_long = app->bits_per_long; | |
6addfa37 | 2297 | |
7972aab2 | 2298 | /* There is only one consumer object per session possible. */ |
6addfa37 | 2299 | consumer_output_get(usess->consumer); |
7972aab2 | 2300 | ua_sess->consumer = usess->consumer; |
6addfa37 | 2301 | |
2bba9e53 | 2302 | ua_sess->output_traces = usess->output_traces; |
ecc48a90 | 2303 | ua_sess->live_timer_interval = usess->live_timer_interval; |
84ad93e8 DG |
2304 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, |
2305 | &usess->metadata_attr); | |
7972aab2 DG |
2306 | |
2307 | switch (ua_sess->buffer_type) { | |
2308 | case LTTNG_BUFFER_PER_PID: | |
2309 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 2310 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
2311 | datetime); |
2312 | break; | |
2313 | case LTTNG_BUFFER_PER_UID: | |
2314 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
470cc211 | 2315 | DEFAULT_UST_TRACE_UID_PATH, |
ff588497 | 2316 | lttng_credentials_get_uid(&ua_sess->real_credentials), |
470cc211 | 2317 | app->bits_per_long); |
7972aab2 DG |
2318 | break; |
2319 | default: | |
2320 | assert(0); | |
2321 | goto error; | |
2322 | } | |
477d7741 MD |
2323 | if (ret < 0) { |
2324 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 2325 | assert(0); |
7972aab2 | 2326 | goto error; |
477d7741 MD |
2327 | } |
2328 | ||
3d071855 MD |
2329 | strncpy(ua_sess->root_shm_path, usess->root_shm_path, |
2330 | sizeof(ua_sess->root_shm_path)); | |
2331 | ua_sess->root_shm_path[sizeof(ua_sess->root_shm_path) - 1] = '\0'; | |
d7ba1388 MD |
2332 | strncpy(ua_sess->shm_path, usess->shm_path, |
2333 | sizeof(ua_sess->shm_path)); | |
2334 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
2335 | if (ua_sess->shm_path[0]) { | |
2336 | switch (ua_sess->buffer_type) { | |
2337 | case LTTNG_BUFFER_PER_PID: | |
2338 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
5da88b0f | 2339 | "/" DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", |
d7ba1388 MD |
2340 | app->name, app->pid, datetime); |
2341 | break; | |
2342 | case LTTNG_BUFFER_PER_UID: | |
2343 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
5da88b0f | 2344 | "/" DEFAULT_UST_TRACE_UID_PATH, |
d7ba1388 MD |
2345 | app->uid, app->bits_per_long); |
2346 | break; | |
2347 | default: | |
2348 | assert(0); | |
2349 | goto error; | |
2350 | } | |
2351 | if (ret < 0) { | |
2352 | PERROR("sprintf UST shadow copy session"); | |
2353 | assert(0); | |
2354 | goto error; | |
2355 | } | |
2356 | strncat(ua_sess->shm_path, tmp_shm_path, | |
2357 | sizeof(ua_sess->shm_path) - strlen(ua_sess->shm_path) - 1); | |
2358 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
2359 | } | |
6addfa37 | 2360 | return; |
7972aab2 DG |
2361 | |
2362 | error: | |
6addfa37 | 2363 | consumer_output_put(ua_sess->consumer); |
48842b30 DG |
2364 | } |
2365 | ||
78f0bacd DG |
2366 | /* |
2367 | * Lookup sesison wrapper. | |
2368 | */ | |
84cd17c6 | 2369 | static |
fb9a95c4 | 2370 | void __lookup_session_by_app(const struct ltt_ust_session *usess, |
bec39940 | 2371 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
2372 | { |
2373 | /* Get right UST app session from app */ | |
d9bf3ca4 | 2374 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
2375 | } |
2376 | ||
421cb601 DG |
2377 | /* |
2378 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 2379 | * id. |
421cb601 | 2380 | */ |
48842b30 | 2381 | static struct ust_app_session *lookup_session_by_app( |
fb9a95c4 | 2382 | const struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 2383 | { |
bec39940 | 2384 | struct lttng_ht_iter iter; |
d9bf3ca4 | 2385 | struct lttng_ht_node_u64 *node; |
48842b30 | 2386 | |
84cd17c6 | 2387 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 2388 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
2389 | if (node == NULL) { |
2390 | goto error; | |
2391 | } | |
2392 | ||
2393 | return caa_container_of(node, struct ust_app_session, node); | |
2394 | ||
2395 | error: | |
2396 | return NULL; | |
2397 | } | |
2398 | ||
7972aab2 DG |
2399 | /* |
2400 | * Setup buffer registry per PID for the given session and application. If none | |
2401 | * is found, a new one is created, added to the global registry and | |
2402 | * initialized. If regp is valid, it's set with the newly created object. | |
2403 | * | |
2404 | * Return 0 on success or else a negative value. | |
2405 | */ | |
2406 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
2407 | struct ust_app *app, struct buffer_reg_pid **regp) | |
2408 | { | |
2409 | int ret = 0; | |
2410 | struct buffer_reg_pid *reg_pid; | |
2411 | ||
2412 | assert(ua_sess); | |
2413 | assert(app); | |
2414 | ||
2415 | rcu_read_lock(); | |
2416 | ||
2417 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
2418 | if (!reg_pid) { | |
2419 | /* | |
2420 | * This is the create channel path meaning that if there is NO | |
2421 | * registry available, we have to create one for this session. | |
2422 | */ | |
d7ba1388 | 2423 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid, |
3d071855 | 2424 | ua_sess->root_shm_path, ua_sess->shm_path); |
7972aab2 DG |
2425 | if (ret < 0) { |
2426 | goto error; | |
2427 | } | |
7972aab2 DG |
2428 | } else { |
2429 | goto end; | |
2430 | } | |
2431 | ||
2432 | /* Initialize registry. */ | |
2433 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
2434 | app->bits_per_long, app->uint8_t_alignment, | |
2435 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf | 2436 | app->uint64_t_alignment, app->long_alignment, |
470cc211 JG |
2437 | app->byte_order, app->version.major, app->version.minor, |
2438 | reg_pid->root_shm_path, reg_pid->shm_path, | |
ff588497 JR |
2439 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
2440 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
2441 | ua_sess->tracing_id, | |
8de88061 | 2442 | app->uid); |
7972aab2 | 2443 | if (ret < 0) { |
286c991a MD |
2444 | /* |
2445 | * reg_pid->registry->reg.ust is NULL upon error, so we need to | |
2446 | * destroy the buffer registry, because it is always expected | |
2447 | * that if the buffer registry can be found, its ust registry is | |
2448 | * non-NULL. | |
2449 | */ | |
2450 | buffer_reg_pid_destroy(reg_pid); | |
7972aab2 DG |
2451 | goto error; |
2452 | } | |
2453 | ||
286c991a MD |
2454 | buffer_reg_pid_add(reg_pid); |
2455 | ||
7972aab2 DG |
2456 | DBG3("UST app buffer registry per PID created successfully"); |
2457 | ||
2458 | end: | |
2459 | if (regp) { | |
2460 | *regp = reg_pid; | |
2461 | } | |
2462 | error: | |
2463 | rcu_read_unlock(); | |
2464 | return ret; | |
2465 | } | |
2466 | ||
2467 | /* | |
2468 | * Setup buffer registry per UID for the given session and application. If none | |
2469 | * is found, a new one is created, added to the global registry and | |
2470 | * initialized. If regp is valid, it's set with the newly created object. | |
2471 | * | |
2472 | * Return 0 on success or else a negative value. | |
2473 | */ | |
2474 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
d7ba1388 | 2475 | struct ust_app_session *ua_sess, |
7972aab2 DG |
2476 | struct ust_app *app, struct buffer_reg_uid **regp) |
2477 | { | |
2478 | int ret = 0; | |
2479 | struct buffer_reg_uid *reg_uid; | |
2480 | ||
2481 | assert(usess); | |
2482 | assert(app); | |
2483 | ||
2484 | rcu_read_lock(); | |
2485 | ||
2486 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2487 | if (!reg_uid) { | |
2488 | /* | |
2489 | * This is the create channel path meaning that if there is NO | |
2490 | * registry available, we have to create one for this session. | |
2491 | */ | |
2492 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
3d071855 MD |
2493 | LTTNG_DOMAIN_UST, ®_uid, |
2494 | ua_sess->root_shm_path, ua_sess->shm_path); | |
7972aab2 DG |
2495 | if (ret < 0) { |
2496 | goto error; | |
2497 | } | |
7972aab2 DG |
2498 | } else { |
2499 | goto end; | |
2500 | } | |
2501 | ||
2502 | /* Initialize registry. */ | |
af6142cf | 2503 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
2504 | app->bits_per_long, app->uint8_t_alignment, |
2505 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
2506 | app->uint64_t_alignment, app->long_alignment, |
2507 | app->byte_order, app->version.major, | |
3d071855 | 2508 | app->version.minor, reg_uid->root_shm_path, |
8de88061 JR |
2509 | reg_uid->shm_path, usess->uid, usess->gid, |
2510 | ua_sess->tracing_id, app->uid); | |
7972aab2 | 2511 | if (ret < 0) { |
286c991a MD |
2512 | /* |
2513 | * reg_uid->registry->reg.ust is NULL upon error, so we need to | |
2514 | * destroy the buffer registry, because it is always expected | |
2515 | * that if the buffer registry can be found, its ust registry is | |
2516 | * non-NULL. | |
2517 | */ | |
2518 | buffer_reg_uid_destroy(reg_uid, NULL); | |
7972aab2 DG |
2519 | goto error; |
2520 | } | |
2521 | /* Add node to teardown list of the session. */ | |
2522 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
2523 | ||
286c991a | 2524 | buffer_reg_uid_add(reg_uid); |
7972aab2 | 2525 | |
286c991a | 2526 | DBG3("UST app buffer registry per UID created successfully"); |
7972aab2 DG |
2527 | end: |
2528 | if (regp) { | |
2529 | *regp = reg_uid; | |
2530 | } | |
2531 | error: | |
2532 | rcu_read_unlock(); | |
2533 | return ret; | |
2534 | } | |
2535 | ||
421cb601 | 2536 | /* |
3d8ca23b | 2537 | * Create a session on the tracer side for the given app. |
421cb601 | 2538 | * |
3d8ca23b DG |
2539 | * On success, ua_sess_ptr is populated with the session pointer or else left |
2540 | * untouched. If the session was created, is_created is set to 1. On error, | |
2541 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
2542 | * be NULL. | |
2543 | * | |
2544 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
2545 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 2546 | */ |
03f91eaa | 2547 | static int find_or_create_ust_app_session(struct ltt_ust_session *usess, |
3d8ca23b DG |
2548 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, |
2549 | int *is_created) | |
421cb601 | 2550 | { |
3d8ca23b | 2551 | int ret, created = 0; |
421cb601 DG |
2552 | struct ust_app_session *ua_sess; |
2553 | ||
3d8ca23b DG |
2554 | assert(usess); |
2555 | assert(app); | |
2556 | assert(ua_sess_ptr); | |
2557 | ||
840cb59c | 2558 | health_code_update(); |
86acf0da | 2559 | |
421cb601 DG |
2560 | ua_sess = lookup_session_by_app(usess, app); |
2561 | if (ua_sess == NULL) { | |
d9bf3ca4 | 2562 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 2563 | app->pid, usess->id); |
40bbd087 | 2564 | ua_sess = alloc_ust_app_session(); |
421cb601 DG |
2565 | if (ua_sess == NULL) { |
2566 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
2567 | ret = -ENOMEM; |
2568 | goto error; | |
421cb601 | 2569 | } |
477d7741 | 2570 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 2571 | created = 1; |
421cb601 DG |
2572 | } |
2573 | ||
7972aab2 DG |
2574 | switch (usess->buffer_type) { |
2575 | case LTTNG_BUFFER_PER_PID: | |
2576 | /* Init local registry. */ | |
2577 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 2578 | if (ret < 0) { |
e64207cf | 2579 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2580 | goto error; |
2581 | } | |
2582 | break; | |
2583 | case LTTNG_BUFFER_PER_UID: | |
2584 | /* Look for a global registry. If none exists, create one. */ | |
d7ba1388 | 2585 | ret = setup_buffer_reg_uid(usess, ua_sess, app, NULL); |
7972aab2 | 2586 | if (ret < 0) { |
e64207cf | 2587 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2588 | goto error; |
2589 | } | |
2590 | break; | |
2591 | default: | |
2592 | assert(0); | |
2593 | ret = -EINVAL; | |
2594 | goto error; | |
2595 | } | |
2596 | ||
2597 | health_code_update(); | |
2598 | ||
2599 | if (ua_sess->handle == -1) { | |
fb45065e | 2600 | pthread_mutex_lock(&app->sock_lock); |
7972aab2 | 2601 | ret = ustctl_create_session(app->sock); |
fb45065e | 2602 | pthread_mutex_unlock(&app->sock_lock); |
7972aab2 DG |
2603 | if (ret < 0) { |
2604 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
2605 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
2606 | app->pid, ret); |
2607 | } else { | |
2608 | DBG("UST app creating session failed. Application is dead"); | |
3757b385 DG |
2609 | /* |
2610 | * This is normal behavior, an application can die during the | |
2611 | * creation process. Don't report an error so the execution can | |
2612 | * continue normally. This will get flagged ENOTCONN and the | |
2613 | * caller will handle it. | |
2614 | */ | |
2615 | ret = 0; | |
ffe60014 | 2616 | } |
d0b96690 | 2617 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
2618 | if (ret != -ENOMEM) { |
2619 | /* | |
2620 | * Tracer is probably gone or got an internal error so let's | |
2621 | * behave like it will soon unregister or not usable. | |
2622 | */ | |
2623 | ret = -ENOTCONN; | |
2624 | } | |
2625 | goto error; | |
421cb601 DG |
2626 | } |
2627 | ||
7972aab2 DG |
2628 | ua_sess->handle = ret; |
2629 | ||
2630 | /* Add ust app session to app's HT */ | |
d9bf3ca4 MD |
2631 | lttng_ht_node_init_u64(&ua_sess->node, |
2632 | ua_sess->tracing_id); | |
2633 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
10b56aef MD |
2634 | lttng_ht_node_init_ulong(&ua_sess->ust_objd_node, ua_sess->handle); |
2635 | lttng_ht_add_unique_ulong(app->ust_sessions_objd, | |
2636 | &ua_sess->ust_objd_node); | |
7972aab2 DG |
2637 | |
2638 | DBG2("UST app session created successfully with handle %d", ret); | |
2639 | } | |
2640 | ||
2641 | *ua_sess_ptr = ua_sess; | |
2642 | if (is_created) { | |
2643 | *is_created = created; | |
2644 | } | |
2645 | ||
2646 | /* Everything went well. */ | |
2647 | ret = 0; | |
2648 | ||
2649 | error: | |
2650 | health_code_update(); | |
2651 | return ret; | |
2652 | } | |
2653 | ||
6a6b2068 JG |
2654 | /* |
2655 | * Match function for a hash table lookup of ust_app_ctx. | |
2656 | * | |
2657 | * It matches an ust app context based on the context type and, in the case | |
2658 | * of perf counters, their name. | |
2659 | */ | |
2660 | static int ht_match_ust_app_ctx(struct cds_lfht_node *node, const void *_key) | |
2661 | { | |
2662 | struct ust_app_ctx *ctx; | |
bdf64013 | 2663 | const struct lttng_ust_context_attr *key; |
6a6b2068 JG |
2664 | |
2665 | assert(node); | |
2666 | assert(_key); | |
2667 | ||
2668 | ctx = caa_container_of(node, struct ust_app_ctx, node.node); | |
2669 | key = _key; | |
2670 | ||
2671 | /* Context type */ | |
2672 | if (ctx->ctx.ctx != key->ctx) { | |
2673 | goto no_match; | |
2674 | } | |
2675 | ||
bdf64013 JG |
2676 | switch(key->ctx) { |
2677 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: | |
6a6b2068 | 2678 | if (strncmp(key->u.perf_counter.name, |
bdf64013 JG |
2679 | ctx->ctx.u.perf_counter.name, |
2680 | sizeof(key->u.perf_counter.name))) { | |
2681 | goto no_match; | |
2682 | } | |
2683 | break; | |
2684 | case LTTNG_UST_CONTEXT_APP_CONTEXT: | |
2685 | if (strcmp(key->u.app_ctx.provider_name, | |
2686 | ctx->ctx.u.app_ctx.provider_name) || | |
2687 | strcmp(key->u.app_ctx.ctx_name, | |
2688 | ctx->ctx.u.app_ctx.ctx_name)) { | |
6a6b2068 JG |
2689 | goto no_match; |
2690 | } | |
bdf64013 JG |
2691 | break; |
2692 | default: | |
2693 | break; | |
6a6b2068 JG |
2694 | } |
2695 | ||
2696 | /* Match. */ | |
2697 | return 1; | |
2698 | ||
2699 | no_match: | |
2700 | return 0; | |
2701 | } | |
2702 | ||
2703 | /* | |
2704 | * Lookup for an ust app context from an lttng_ust_context. | |
2705 | * | |
be184a0f | 2706 | * Must be called while holding RCU read side lock. |
6a6b2068 JG |
2707 | * Return an ust_app_ctx object or NULL on error. |
2708 | */ | |
2709 | static | |
2710 | struct ust_app_ctx *find_ust_app_context(struct lttng_ht *ht, | |
bdf64013 | 2711 | struct lttng_ust_context_attr *uctx) |
6a6b2068 JG |
2712 | { |
2713 | struct lttng_ht_iter iter; | |
2714 | struct lttng_ht_node_ulong *node; | |
2715 | struct ust_app_ctx *app_ctx = NULL; | |
2716 | ||
2717 | assert(uctx); | |
2718 | assert(ht); | |
2719 | ||
2720 | /* Lookup using the lttng_ust_context_type and a custom match fct. */ | |
2721 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) uctx->ctx, lttng_ht_seed), | |
2722 | ht_match_ust_app_ctx, uctx, &iter.iter); | |
2723 | node = lttng_ht_iter_get_node_ulong(&iter); | |
2724 | if (!node) { | |
2725 | goto end; | |
2726 | } | |
2727 | ||
2728 | app_ctx = caa_container_of(node, struct ust_app_ctx, node); | |
2729 | ||
2730 | end: | |
2731 | return app_ctx; | |
2732 | } | |
2733 | ||
7972aab2 DG |
2734 | /* |
2735 | * Create a context for the channel on the tracer. | |
2736 | * | |
2737 | * Called with UST app session lock held and a RCU read side lock. | |
2738 | */ | |
2739 | static | |
c9edf082 | 2740 | int create_ust_app_channel_context(struct ust_app_channel *ua_chan, |
f3db82be | 2741 | struct lttng_ust_context_attr *uctx, |
7972aab2 DG |
2742 | struct ust_app *app) |
2743 | { | |
2744 | int ret = 0; | |
7972aab2 DG |
2745 | struct ust_app_ctx *ua_ctx; |
2746 | ||
2747 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
2748 | ||
6a6b2068 JG |
2749 | ua_ctx = find_ust_app_context(ua_chan->ctx, uctx); |
2750 | if (ua_ctx) { | |
7972aab2 DG |
2751 | ret = -EEXIST; |
2752 | goto error; | |
2753 | } | |
2754 | ||
2755 | ua_ctx = alloc_ust_app_ctx(uctx); | |
2756 | if (ua_ctx == NULL) { | |
2757 | /* malloc failed */ | |
7682f304 | 2758 | ret = -ENOMEM; |
7972aab2 DG |
2759 | goto error; |
2760 | } | |
2761 | ||
2762 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 2763 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 2764 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
2765 | |
2766 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
2767 | if (ret < 0) { | |
2768 | goto error; | |
2769 | } | |
2770 | ||
2771 | error: | |
2772 | return ret; | |
2773 | } | |
2774 | ||
2775 | /* | |
2776 | * Enable on the tracer side a ust app event for the session and channel. | |
2777 | * | |
2778 | * Called with UST app session lock held. | |
2779 | */ | |
2780 | static | |
2781 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
2782 | struct ust_app_event *ua_event, struct ust_app *app) | |
2783 | { | |
2784 | int ret; | |
2785 | ||
3428a1b7 | 2786 | ret = enable_ust_object(app, ua_event->obj); |
7972aab2 DG |
2787 | if (ret < 0) { |
2788 | goto error; | |
2789 | } | |
2790 | ||
2791 | ua_event->enabled = 1; | |
2792 | ||
2793 | error: | |
2794 | return ret; | |
2795 | } | |
2796 | ||
2797 | /* | |
2798 | * Disable on the tracer side a ust app event for the session and channel. | |
2799 | */ | |
2800 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
2801 | struct ust_app_event *ua_event, struct ust_app *app) | |
2802 | { | |
2803 | int ret; | |
2804 | ||
e2456d0a | 2805 | ret = disable_ust_object(app, ua_event->obj); |
7972aab2 DG |
2806 | if (ret < 0) { |
2807 | goto error; | |
2808 | } | |
2809 | ||
2810 | ua_event->enabled = 0; | |
2811 | ||
2812 | error: | |
2813 | return ret; | |
2814 | } | |
2815 | ||
2816 | /* | |
2817 | * Lookup ust app channel for session and disable it on the tracer side. | |
2818 | */ | |
2819 | static | |
2820 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
2821 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
2822 | { | |
2823 | int ret; | |
2824 | ||
2825 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2826 | if (ret < 0) { | |
2827 | goto error; | |
2828 | } | |
2829 | ||
2830 | ua_chan->enabled = 0; | |
2831 | ||
2832 | error: | |
2833 | return ret; | |
2834 | } | |
2835 | ||
2836 | /* | |
2837 | * Lookup ust app channel for session and enable it on the tracer side. This | |
2838 | * MUST be called with a RCU read side lock acquired. | |
2839 | */ | |
2840 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
2841 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
2842 | { | |
2843 | int ret = 0; | |
2844 | struct lttng_ht_iter iter; | |
2845 | struct lttng_ht_node_str *ua_chan_node; | |
2846 | struct ust_app_channel *ua_chan; | |
2847 | ||
2848 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
2849 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
2850 | if (ua_chan_node == NULL) { | |
d9bf3ca4 | 2851 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
2852 | uchan->name, ua_sess->tracing_id); |
2853 | goto error; | |
2854 | } | |
2855 | ||
2856 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2857 | ||
2858 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
2859 | if (ret < 0) { | |
2860 | goto error; | |
2861 | } | |
2862 | ||
2863 | error: | |
2864 | return ret; | |
2865 | } | |
2866 | ||
2867 | /* | |
2868 | * Ask the consumer to create a channel and get it if successful. | |
2869 | * | |
fad1ed2f JR |
2870 | * Called with UST app session lock held. |
2871 | * | |
7972aab2 DG |
2872 | * Return 0 on success or else a negative value. |
2873 | */ | |
2874 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
2875 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
e098433c JG |
2876 | int bitness, struct ust_registry_session *registry, |
2877 | uint64_t trace_archive_id) | |
7972aab2 DG |
2878 | { |
2879 | int ret; | |
2880 | unsigned int nb_fd = 0; | |
2881 | struct consumer_socket *socket; | |
2882 | ||
2883 | assert(usess); | |
2884 | assert(ua_sess); | |
2885 | assert(ua_chan); | |
2886 | assert(registry); | |
2887 | ||
2888 | rcu_read_lock(); | |
2889 | health_code_update(); | |
2890 | ||
2891 | /* Get the right consumer socket for the application. */ | |
2892 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
2893 | if (!socket) { | |
2894 | ret = -EINVAL; | |
2895 | goto error; | |
2896 | } | |
2897 | ||
2898 | health_code_update(); | |
2899 | ||
2900 | /* Need one fd for the channel. */ | |
2901 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2902 | if (ret < 0) { | |
2903 | ERR("Exhausted number of available FD upon create channel"); | |
2904 | goto error; | |
2905 | } | |
2906 | ||
2907 | /* | |
2908 | * Ask consumer to create channel. The consumer will return the number of | |
2909 | * stream we have to expect. | |
2910 | */ | |
2911 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
d2956687 | 2912 | registry, usess->current_trace_chunk); |
7972aab2 DG |
2913 | if (ret < 0) { |
2914 | goto error_ask; | |
2915 | } | |
2916 | ||
2917 | /* | |
2918 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2919 | * stream (2 being the default value here). | |
2920 | */ | |
2921 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2922 | ||
2923 | /* Reserve the amount of file descriptor we need. */ | |
2924 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2925 | if (ret < 0) { | |
2926 | ERR("Exhausted number of available FD upon create channel"); | |
2927 | goto error_fd_get_stream; | |
2928 | } | |
2929 | ||
2930 | health_code_update(); | |
2931 | ||
2932 | /* | |
2933 | * Now get the channel from the consumer. This call wil populate the stream | |
2934 | * list of that channel and set the ust objects. | |
2935 | */ | |
d9078d0c DG |
2936 | if (usess->consumer->enabled) { |
2937 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2938 | if (ret < 0) { | |
2939 | goto error_destroy; | |
2940 | } | |
7972aab2 DG |
2941 | } |
2942 | ||
2943 | rcu_read_unlock(); | |
2944 | return 0; | |
2945 | ||
2946 | error_destroy: | |
2947 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2948 | error_fd_get_stream: | |
2949 | /* | |
2950 | * Initiate a destroy channel on the consumer since we had an error | |
2951 | * handling it on our side. The return value is of no importance since we | |
2952 | * already have a ret value set by the previous error that we need to | |
2953 | * return. | |
2954 | */ | |
2955 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2956 | error_ask: | |
2957 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2958 | error: | |
2959 | health_code_update(); | |
2960 | rcu_read_unlock(); | |
2961 | return ret; | |
2962 | } | |
2963 | ||
2964 | /* | |
2965 | * Duplicate the ust data object of the ust app stream and save it in the | |
2966 | * buffer registry stream. | |
2967 | * | |
2968 | * Return 0 on success or else a negative value. | |
2969 | */ | |
2970 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2971 | struct ust_app_stream *stream) | |
2972 | { | |
2973 | int ret; | |
2974 | ||
2975 | assert(reg_stream); | |
2976 | assert(stream); | |
2977 | ||
2978 | /* Reserve the amount of file descriptor we need. */ | |
2979 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2980 | if (ret < 0) { | |
2981 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2982 | goto error; | |
2983 | } | |
2984 | ||
2985 | /* Duplicate object for stream once the original is in the registry. */ | |
2986 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2987 | reg_stream->obj.ust); | |
2988 | if (ret < 0) { | |
2989 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2990 | reg_stream->obj.ust, stream->obj, ret); | |
2991 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2992 | goto error; | |
2993 | } | |
2994 | stream->handle = stream->obj->handle; | |
2995 | ||
2996 | error: | |
2997 | return ret; | |
2998 | } | |
2999 | ||
3000 | /* | |
3001 | * Duplicate the ust data object of the ust app. channel and save it in the | |
3002 | * buffer registry channel. | |
3003 | * | |
3004 | * Return 0 on success or else a negative value. | |
3005 | */ | |
3006 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
3007 | struct ust_app_channel *ua_chan) | |
3008 | { | |
3009 | int ret; | |
3010 | ||
3011 | assert(reg_chan); | |
3012 | assert(ua_chan); | |
3013 | ||
3014 | /* Need two fds for the channel. */ | |
3015 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
3016 | if (ret < 0) { | |
3017 | ERR("Exhausted number of available FD upon duplicate channel"); | |
3018 | goto error_fd_get; | |
3019 | } | |
3020 | ||
3021 | /* Duplicate object for stream once the original is in the registry. */ | |
3022 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
3023 | if (ret < 0) { | |
3024 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
3025 | reg_chan->obj.ust, ua_chan->obj, ret); | |
3026 | goto error; | |
3027 | } | |
3028 | ua_chan->handle = ua_chan->obj->handle; | |
3029 | ||
3030 | return 0; | |
3031 | ||
3032 | error: | |
3033 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
3034 | error_fd_get: | |
3035 | return ret; | |
3036 | } | |
3037 | ||
3038 | /* | |
3039 | * For a given channel buffer registry, setup all streams of the given ust | |
3040 | * application channel. | |
3041 | * | |
3042 | * Return 0 on success or else a negative value. | |
3043 | */ | |
3044 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
fb45065e MD |
3045 | struct ust_app_channel *ua_chan, |
3046 | struct ust_app *app) | |
7972aab2 DG |
3047 | { |
3048 | int ret = 0; | |
3049 | struct ust_app_stream *stream, *stmp; | |
3050 | ||
3051 | assert(reg_chan); | |
3052 | assert(ua_chan); | |
3053 | ||
3054 | DBG2("UST app setup buffer registry stream"); | |
3055 | ||
3056 | /* Send all streams to application. */ | |
3057 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
3058 | struct buffer_reg_stream *reg_stream; | |
3059 | ||
3060 | ret = buffer_reg_stream_create(®_stream); | |
3061 | if (ret < 0) { | |
3062 | goto error; | |
3063 | } | |
3064 | ||
3065 | /* | |
3066 | * Keep original pointer and nullify it in the stream so the delete | |
3067 | * stream call does not release the object. | |
3068 | */ | |
3069 | reg_stream->obj.ust = stream->obj; | |
3070 | stream->obj = NULL; | |
3071 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 3072 | |
7972aab2 DG |
3073 | /* We don't need the streams anymore. */ |
3074 | cds_list_del(&stream->list); | |
fb45065e | 3075 | delete_ust_app_stream(-1, stream, app); |
7972aab2 | 3076 | } |
421cb601 | 3077 | |
7972aab2 DG |
3078 | error: |
3079 | return ret; | |
3080 | } | |
3081 | ||
3082 | /* | |
3083 | * Create a buffer registry channel for the given session registry and | |
3084 | * application channel object. If regp pointer is valid, it's set with the | |
3085 | * created object. Important, the created object is NOT added to the session | |
3086 | * registry hash table. | |
3087 | * | |
3088 | * Return 0 on success else a negative value. | |
3089 | */ | |
3090 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
3091 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
3092 | { | |
3093 | int ret; | |
3094 | struct buffer_reg_channel *reg_chan = NULL; | |
3095 | ||
3096 | assert(reg_sess); | |
3097 | assert(ua_chan); | |
3098 | ||
3099 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
3100 | ||
3101 | /* Create buffer registry channel. */ | |
3102 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
3103 | if (ret < 0) { | |
3104 | goto error_create; | |
421cb601 | 3105 | } |
7972aab2 DG |
3106 | assert(reg_chan); |
3107 | reg_chan->consumer_key = ua_chan->key; | |
8c924c7b | 3108 | reg_chan->subbuf_size = ua_chan->attr.subbuf_size; |
d07ceecd | 3109 | reg_chan->num_subbuf = ua_chan->attr.num_subbuf; |
421cb601 | 3110 | |
7972aab2 DG |
3111 | /* Create and add a channel registry to session. */ |
3112 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
3113 | ua_chan->tracing_channel_id); | |
3114 | if (ret < 0) { | |
3115 | goto error; | |
d88aee68 | 3116 | } |
7972aab2 | 3117 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 3118 | |
7972aab2 DG |
3119 | if (regp) { |
3120 | *regp = reg_chan; | |
3d8ca23b | 3121 | } |
d88aee68 | 3122 | |
7972aab2 | 3123 | return 0; |
3d8ca23b DG |
3124 | |
3125 | error: | |
7972aab2 DG |
3126 | /* Safe because the registry channel object was not added to any HT. */ |
3127 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
3128 | error_create: | |
3d8ca23b | 3129 | return ret; |
421cb601 DG |
3130 | } |
3131 | ||
55cc08a6 | 3132 | /* |
7972aab2 DG |
3133 | * Setup buffer registry channel for the given session registry and application |
3134 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 3135 | * |
7972aab2 | 3136 | * Return 0 on success else a negative value. |
55cc08a6 | 3137 | */ |
7972aab2 | 3138 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
fb45065e MD |
3139 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan, |
3140 | struct ust_app *app) | |
55cc08a6 | 3141 | { |
7972aab2 | 3142 | int ret; |
55cc08a6 | 3143 | |
7972aab2 DG |
3144 | assert(reg_sess); |
3145 | assert(reg_chan); | |
3146 | assert(ua_chan); | |
3147 | assert(ua_chan->obj); | |
55cc08a6 | 3148 | |
7972aab2 | 3149 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 3150 | |
7972aab2 | 3151 | /* Setup all streams for the registry. */ |
fb45065e | 3152 | ret = setup_buffer_reg_streams(reg_chan, ua_chan, app); |
7972aab2 | 3153 | if (ret < 0) { |
55cc08a6 DG |
3154 | goto error; |
3155 | } | |
3156 | ||
7972aab2 DG |
3157 | reg_chan->obj.ust = ua_chan->obj; |
3158 | ua_chan->obj = NULL; | |
55cc08a6 | 3159 | |
7972aab2 | 3160 | return 0; |
55cc08a6 DG |
3161 | |
3162 | error: | |
7972aab2 DG |
3163 | buffer_reg_channel_remove(reg_sess, reg_chan); |
3164 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
3165 | return ret; |
3166 | } | |
3167 | ||
edb67388 | 3168 | /* |
7972aab2 | 3169 | * Send buffer registry channel to the application. |
d0b96690 | 3170 | * |
7972aab2 | 3171 | * Return 0 on success else a negative value. |
edb67388 | 3172 | */ |
7972aab2 DG |
3173 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
3174 | struct ust_app *app, struct ust_app_session *ua_sess, | |
3175 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
3176 | { |
3177 | int ret; | |
7972aab2 | 3178 | struct buffer_reg_stream *reg_stream; |
edb67388 | 3179 | |
7972aab2 DG |
3180 | assert(reg_chan); |
3181 | assert(app); | |
3182 | assert(ua_sess); | |
3183 | assert(ua_chan); | |
3184 | ||
3185 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
3186 | ||
3187 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
3188 | if (ret < 0) { |
3189 | goto error; | |
3190 | } | |
3191 | ||
7972aab2 DG |
3192 | /* Send channel to the application. */ |
3193 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
3194 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
3195 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
3196 | goto error; | |
3197 | } else if (ret < 0) { | |
7972aab2 DG |
3198 | goto error; |
3199 | } | |
3200 | ||
3201 | health_code_update(); | |
3202 | ||
3203 | /* Send all streams to application. */ | |
3204 | pthread_mutex_lock(®_chan->stream_list_lock); | |
3205 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
3206 | struct ust_app_stream stream; | |
3207 | ||
3208 | ret = duplicate_stream_object(reg_stream, &stream); | |
3209 | if (ret < 0) { | |
3210 | goto error_stream_unlock; | |
3211 | } | |
3212 | ||
3213 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
3214 | if (ret < 0) { | |
fb45065e | 3215 | (void) release_ust_app_stream(-1, &stream, app); |
a7169585 MD |
3216 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
3217 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
a7169585 | 3218 | } |
7972aab2 DG |
3219 | goto error_stream_unlock; |
3220 | } | |
edb67388 | 3221 | |
7972aab2 DG |
3222 | /* |
3223 | * The return value is not important here. This function will output an | |
3224 | * error if needed. | |
3225 | */ | |
fb45065e | 3226 | (void) release_ust_app_stream(-1, &stream, app); |
7972aab2 DG |
3227 | } |
3228 | ua_chan->is_sent = 1; | |
3229 | ||
3230 | error_stream_unlock: | |
3231 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
3232 | error: |
3233 | return ret; | |
3234 | } | |
3235 | ||
9730260e | 3236 | /* |
7972aab2 DG |
3237 | * Create and send to the application the created buffers with per UID buffers. |
3238 | * | |
9acdc1d6 | 3239 | * This MUST be called with a RCU read side lock acquired. |
71e0a100 | 3240 | * The session list lock and the session's lock must be acquired. |
9acdc1d6 | 3241 | * |
7972aab2 | 3242 | * Return 0 on success else a negative value. |
9730260e | 3243 | */ |
7972aab2 DG |
3244 | static int create_channel_per_uid(struct ust_app *app, |
3245 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
3246 | struct ust_app_channel *ua_chan) | |
9730260e DG |
3247 | { |
3248 | int ret; | |
7972aab2 DG |
3249 | struct buffer_reg_uid *reg_uid; |
3250 | struct buffer_reg_channel *reg_chan; | |
e32d7f27 | 3251 | struct ltt_session *session = NULL; |
e098433c JG |
3252 | enum lttng_error_code notification_ret; |
3253 | struct ust_registry_channel *chan_reg; | |
9730260e | 3254 | |
7972aab2 DG |
3255 | assert(app); |
3256 | assert(usess); | |
3257 | assert(ua_sess); | |
3258 | assert(ua_chan); | |
3259 | ||
3260 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
3261 | ||
3262 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
3263 | /* | |
3264 | * The session creation handles the creation of this global registry | |
3265 | * object. If none can be find, there is a code flow problem or a | |
3266 | * teardown race. | |
3267 | */ | |
3268 | assert(reg_uid); | |
3269 | ||
3270 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
3271 | reg_uid); | |
2721f7ea JG |
3272 | if (reg_chan) { |
3273 | goto send_channel; | |
3274 | } | |
7972aab2 | 3275 | |
2721f7ea JG |
3276 | /* Create the buffer registry channel object. */ |
3277 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
3278 | if (ret < 0) { | |
3279 | ERR("Error creating the UST channel \"%s\" registry instance", | |
f14256d6 | 3280 | ua_chan->name); |
2721f7ea JG |
3281 | goto error; |
3282 | } | |
f14256d6 | 3283 | |
e098433c JG |
3284 | session = session_find_by_id(ua_sess->tracing_id); |
3285 | assert(session); | |
3286 | assert(pthread_mutex_trylock(&session->lock)); | |
3287 | assert(session_trylock_list()); | |
3288 | ||
2721f7ea JG |
3289 | /* |
3290 | * Create the buffers on the consumer side. This call populates the | |
3291 | * ust app channel object with all streams and data object. | |
3292 | */ | |
3293 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
e098433c | 3294 | app->bits_per_long, reg_uid->registry->reg.ust, |
d2956687 | 3295 | session->most_recent_chunk_id.value); |
2721f7ea JG |
3296 | if (ret < 0) { |
3297 | ERR("Error creating UST channel \"%s\" on the consumer daemon", | |
3298 | ua_chan->name); | |
7972aab2 DG |
3299 | |
3300 | /* | |
2721f7ea JG |
3301 | * Let's remove the previously created buffer registry channel so |
3302 | * it's not visible anymore in the session registry. | |
7972aab2 | 3303 | */ |
2721f7ea JG |
3304 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, |
3305 | ua_chan->tracing_channel_id, false); | |
3306 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
3307 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
3308 | goto error; | |
7972aab2 DG |
3309 | } |
3310 | ||
2721f7ea JG |
3311 | /* |
3312 | * Setup the streams and add it to the session registry. | |
3313 | */ | |
3314 | ret = setup_buffer_reg_channel(reg_uid->registry, | |
3315 | ua_chan, reg_chan, app); | |
3316 | if (ret < 0) { | |
3317 | ERR("Error setting up UST channel \"%s\"", ua_chan->name); | |
3318 | goto error; | |
3319 | } | |
3320 | ||
e098433c JG |
3321 | /* Notify the notification subsystem of the channel's creation. */ |
3322 | pthread_mutex_lock(®_uid->registry->reg.ust->lock); | |
3323 | chan_reg = ust_registry_channel_find(reg_uid->registry->reg.ust, | |
3324 | ua_chan->tracing_channel_id); | |
3325 | assert(chan_reg); | |
3326 | chan_reg->consumer_key = ua_chan->key; | |
3327 | chan_reg = NULL; | |
3328 | pthread_mutex_unlock(®_uid->registry->reg.ust->lock); | |
e9404c27 | 3329 | |
e098433c JG |
3330 | notification_ret = notification_thread_command_add_channel( |
3331 | notification_thread_handle, session->name, | |
ff588497 JR |
3332 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
3333 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
3334 | ua_chan->name, | |
470cc211 | 3335 | ua_chan->key, LTTNG_DOMAIN_UST, |
e098433c JG |
3336 | ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf); |
3337 | if (notification_ret != LTTNG_OK) { | |
3338 | ret = - (int) notification_ret; | |
3339 | ERR("Failed to add channel to notification thread"); | |
3340 | goto error; | |
e9404c27 JG |
3341 | } |
3342 | ||
2721f7ea | 3343 | send_channel: |
66ff8e3f JG |
3344 | /* Send buffers to the application. */ |
3345 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
3346 | if (ret < 0) { | |
3347 | if (ret != -ENOTCONN) { | |
3348 | ERR("Error sending channel to application"); | |
3349 | } | |
3350 | goto error; | |
3351 | } | |
3352 | ||
9730260e | 3353 | error: |
e32d7f27 JG |
3354 | if (session) { |
3355 | session_put(session); | |
3356 | } | |
9730260e DG |
3357 | return ret; |
3358 | } | |
3359 | ||
78f0bacd | 3360 | /* |
7972aab2 DG |
3361 | * Create and send to the application the created buffers with per PID buffers. |
3362 | * | |
fad1ed2f | 3363 | * Called with UST app session lock held. |
71e0a100 | 3364 | * The session list lock and the session's lock must be acquired. |
fad1ed2f | 3365 | * |
7972aab2 | 3366 | * Return 0 on success else a negative value. |
78f0bacd | 3367 | */ |
7972aab2 DG |
3368 | static int create_channel_per_pid(struct ust_app *app, |
3369 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
3370 | struct ust_app_channel *ua_chan) | |
78f0bacd | 3371 | { |
8535a6d9 | 3372 | int ret; |
7972aab2 | 3373 | struct ust_registry_session *registry; |
e9404c27 | 3374 | enum lttng_error_code cmd_ret; |
e32d7f27 | 3375 | struct ltt_session *session = NULL; |
e9404c27 JG |
3376 | uint64_t chan_reg_key; |
3377 | struct ust_registry_channel *chan_reg; | |
78f0bacd | 3378 | |
7972aab2 DG |
3379 | assert(app); |
3380 | assert(usess); | |
3381 | assert(ua_sess); | |
3382 | assert(ua_chan); | |
3383 | ||
3384 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
3385 | ||
3386 | rcu_read_lock(); | |
3387 | ||
3388 | registry = get_session_registry(ua_sess); | |
fad1ed2f | 3389 | /* The UST app session lock is held, registry shall not be null. */ |
7972aab2 DG |
3390 | assert(registry); |
3391 | ||
3392 | /* Create and add a new channel registry to session. */ | |
3393 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd | 3394 | if (ret < 0) { |
f14256d6 MD |
3395 | ERR("Error creating the UST channel \"%s\" registry instance", |
3396 | ua_chan->name); | |
78f0bacd DG |
3397 | goto error; |
3398 | } | |
3399 | ||
e098433c JG |
3400 | session = session_find_by_id(ua_sess->tracing_id); |
3401 | assert(session); | |
3402 | ||
3403 | assert(pthread_mutex_trylock(&session->lock)); | |
3404 | assert(session_trylock_list()); | |
3405 | ||
7972aab2 DG |
3406 | /* Create and get channel on the consumer side. */ |
3407 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
e098433c | 3408 | app->bits_per_long, registry, |
d2956687 | 3409 | session->most_recent_chunk_id.value); |
7972aab2 | 3410 | if (ret < 0) { |
f14256d6 MD |
3411 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
3412 | ua_chan->name); | |
5b951542 | 3413 | goto error_remove_from_registry; |
7972aab2 DG |
3414 | } |
3415 | ||
3416 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
3417 | if (ret < 0) { | |
a7169585 MD |
3418 | if (ret != -ENOTCONN) { |
3419 | ERR("Error sending channel to application"); | |
3420 | } | |
5b951542 | 3421 | goto error_remove_from_registry; |
7972aab2 | 3422 | } |
8535a6d9 | 3423 | |
e9404c27 JG |
3424 | chan_reg_key = ua_chan->key; |
3425 | pthread_mutex_lock(®istry->lock); | |
3426 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
3427 | assert(chan_reg); | |
3428 | chan_reg->consumer_key = ua_chan->key; | |
3429 | pthread_mutex_unlock(®istry->lock); | |
3430 | ||
3431 | cmd_ret = notification_thread_command_add_channel( | |
3432 | notification_thread_handle, session->name, | |
ff588497 JR |
3433 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
3434 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
3435 | ua_chan->name, | |
470cc211 | 3436 | ua_chan->key, LTTNG_DOMAIN_UST, |
e9404c27 JG |
3437 | ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf); |
3438 | if (cmd_ret != LTTNG_OK) { | |
3439 | ret = - (int) cmd_ret; | |
3440 | ERR("Failed to add channel to notification thread"); | |
5b951542 | 3441 | goto error_remove_from_registry; |
e9404c27 JG |
3442 | } |
3443 | ||
5b951542 MD |
3444 | error_remove_from_registry: |
3445 | if (ret) { | |
3446 | ust_registry_channel_del_free(registry, ua_chan->key, false); | |
3447 | } | |
78f0bacd | 3448 | error: |
7972aab2 | 3449 | rcu_read_unlock(); |
e32d7f27 JG |
3450 | if (session) { |
3451 | session_put(session); | |
3452 | } | |
78f0bacd DG |
3453 | return ret; |
3454 | } | |
3455 | ||
3456 | /* | |
7972aab2 | 3457 | * From an already allocated ust app channel, create the channel buffers if |
88e3c2f5 | 3458 | * needed and send them to the application. This MUST be called with a RCU read |
7972aab2 DG |
3459 | * side lock acquired. |
3460 | * | |
fad1ed2f JR |
3461 | * Called with UST app session lock held. |
3462 | * | |
a7169585 MD |
3463 | * Return 0 on success or else a negative value. Returns -ENOTCONN if |
3464 | * the application exited concurrently. | |
78f0bacd | 3465 | */ |
88e3c2f5 | 3466 | static int ust_app_channel_send(struct ust_app *app, |
7972aab2 DG |
3467 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, |
3468 | struct ust_app_channel *ua_chan) | |
78f0bacd | 3469 | { |
7972aab2 | 3470 | int ret; |
78f0bacd | 3471 | |
7972aab2 DG |
3472 | assert(app); |
3473 | assert(usess); | |
88e3c2f5 | 3474 | assert(usess->active); |
7972aab2 DG |
3475 | assert(ua_sess); |
3476 | assert(ua_chan); | |
3477 | ||
3478 | /* Handle buffer type before sending the channel to the application. */ | |
3479 | switch (usess->buffer_type) { | |
3480 | case LTTNG_BUFFER_PER_UID: | |
3481 | { | |
3482 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
3483 | if (ret < 0) { | |
3484 | goto error; | |
3485 | } | |
3486 | break; | |
3487 | } | |
3488 | case LTTNG_BUFFER_PER_PID: | |
3489 | { | |
3490 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
3491 | if (ret < 0) { | |
3492 | goto error; | |
3493 | } | |
3494 | break; | |
3495 | } | |
3496 | default: | |
3497 | assert(0); | |
3498 | ret = -EINVAL; | |
78f0bacd DG |
3499 | goto error; |
3500 | } | |
3501 | ||
7972aab2 DG |
3502 | /* Initialize ust objd object using the received handle and add it. */ |
3503 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
3504 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 3505 | |
7972aab2 DG |
3506 | /* If channel is not enabled, disable it on the tracer */ |
3507 | if (!ua_chan->enabled) { | |
3508 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
3509 | if (ret < 0) { | |
3510 | goto error; | |
3511 | } | |
78f0bacd DG |
3512 | } |
3513 | ||
3514 | error: | |
3515 | return ret; | |
3516 | } | |
3517 | ||
284d8f55 | 3518 | /* |
88e3c2f5 | 3519 | * Create UST app channel and return it through ua_chanp if not NULL. |
d0b96690 | 3520 | * |
36b588ed | 3521 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 | 3522 | * |
88e3c2f5 | 3523 | * Return 0 on success or else a negative value. |
284d8f55 | 3524 | */ |
88e3c2f5 JG |
3525 | static int ust_app_channel_allocate(struct ust_app_session *ua_sess, |
3526 | struct ltt_ust_channel *uchan, | |
7972aab2 | 3527 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 3528 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
3529 | { |
3530 | int ret = 0; | |
bec39940 DG |
3531 | struct lttng_ht_iter iter; |
3532 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
3533 | struct ust_app_channel *ua_chan; |
3534 | ||
3535 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3536 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
3537 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 3538 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 3539 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 3540 | goto end; |
5b4a0ec0 DG |
3541 | } |
3542 | ||
d0b96690 | 3543 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
3544 | if (ua_chan == NULL) { |
3545 | /* Only malloc can fail here */ | |
4d710ac2 | 3546 | ret = -ENOMEM; |
88e3c2f5 | 3547 | goto error; |
fc34caaa DG |
3548 | } |
3549 | shadow_copy_channel(ua_chan, uchan); | |
3550 | ||
ffe60014 DG |
3551 | /* Set channel type. */ |
3552 | ua_chan->attr.type = type; | |
3553 | ||
d0b96690 DG |
3554 | /* Only add the channel if successful on the tracer side. */ |
3555 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
fc34caaa | 3556 | end: |
4d710ac2 DG |
3557 | if (ua_chanp) { |
3558 | *ua_chanp = ua_chan; | |
3559 | } | |
3560 | ||
3561 | /* Everything went well. */ | |
3562 | return 0; | |
5b4a0ec0 DG |
3563 | |
3564 | error: | |
4d710ac2 | 3565 | return ret; |
5b4a0ec0 DG |
3566 | } |
3567 | ||
3568 | /* | |
3569 | * Create UST app event and create it on the tracer side. | |
d0b96690 | 3570 | * |
993578ff | 3571 | * Must be called with the RCU read side lock held. |
d0b96690 | 3572 | * Called with ust app session mutex held. |
5b4a0ec0 | 3573 | */ |
edb67388 DG |
3574 | static |
3575 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
3576 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
3577 | struct ust_app *app) | |
284d8f55 | 3578 | { |
edb67388 | 3579 | int ret = 0; |
5b4a0ec0 | 3580 | struct ust_app_event *ua_event; |
284d8f55 | 3581 | |
edb67388 DG |
3582 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
3583 | if (ua_event == NULL) { | |
20533947 | 3584 | /* Only failure mode of alloc_ust_app_event(). */ |
edb67388 | 3585 | ret = -ENOMEM; |
fc34caaa | 3586 | goto end; |
5b4a0ec0 | 3587 | } |
edb67388 | 3588 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 3589 | |
edb67388 | 3590 | /* Create it on the tracer side */ |
5b4a0ec0 | 3591 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 3592 | if (ret < 0) { |
e9f11505 JG |
3593 | /* |
3594 | * Not found previously means that it does not exist on the | |
3595 | * tracer. If the application reports that the event existed, | |
3596 | * it means there is a bug in the sessiond or lttng-ust | |
3597 | * (or corruption, etc.) | |
3598 | */ | |
3599 | if (ret == -LTTNG_UST_ERR_EXIST) { | |
3600 | ERR("Tracer for application reported that an event being created already existed: " | |
3601 | "event_name = \"%s\", pid = %d, ppid = %d, uid = %d, gid = %d", | |
3602 | uevent->attr.name, | |
3603 | app->pid, app->ppid, app->uid, | |
3604 | app->gid); | |
3605 | } | |
284d8f55 DG |
3606 | goto error; |
3607 | } | |
3608 | ||
d0b96690 | 3609 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 3610 | |
993578ff JR |
3611 | DBG2("UST app create event completed: app = '%s' (ppid: %d)", |
3612 | app->name, app->ppid); | |
7f79d3a1 | 3613 | |
edb67388 | 3614 | end: |
fc34caaa DG |
3615 | return ret; |
3616 | ||
5b4a0ec0 | 3617 | error: |
fc34caaa | 3618 | /* Valid. Calling here is already in a read side lock */ |
fb45065e | 3619 | delete_ust_app_event(-1, ua_event, app); |
edb67388 | 3620 | return ret; |
5b4a0ec0 DG |
3621 | } |
3622 | ||
993578ff JR |
3623 | /* |
3624 | * Create UST app event notifier rule and create it on the tracer side. | |
3625 | * | |
3626 | * Must be called with the RCU read side lock held. | |
3627 | * Called with ust app session mutex held. | |
3628 | */ | |
3629 | static | |
267d66aa JR |
3630 | int create_ust_app_event_notifier_rule(struct lttng_trigger *trigger, |
3631 | struct ust_app *app) | |
993578ff JR |
3632 | { |
3633 | int ret = 0; | |
3634 | struct ust_app_event_notifier_rule *ua_event_notifier_rule; | |
3635 | ||
267d66aa | 3636 | ua_event_notifier_rule = alloc_ust_app_event_notifier_rule(trigger); |
993578ff JR |
3637 | if (ua_event_notifier_rule == NULL) { |
3638 | ret = -ENOMEM; | |
3639 | goto end; | |
3640 | } | |
3641 | ||
3642 | /* Create it on the tracer side. */ | |
3643 | ret = create_ust_event_notifier(app, ua_event_notifier_rule); | |
3644 | if (ret < 0) { | |
3645 | /* | |
3646 | * Not found previously means that it does not exist on the | |
3647 | * tracer. If the application reports that the event existed, | |
3648 | * it means there is a bug in the sessiond or lttng-ust | |
3649 | * (or corruption, etc.) | |
3650 | */ | |
3651 | if (ret == -LTTNG_UST_ERR_EXIST) { | |
3652 | ERR("Tracer for application reported that an event notifier being created already exists: " | |
3653 | "token = \"%" PRIu64 "\", pid = %d, ppid = %d, uid = %d, gid = %d", | |
267d66aa | 3654 | lttng_trigger_get_tracer_token(trigger), |
993578ff JR |
3655 | app->pid, app->ppid, app->uid, |
3656 | app->gid); | |
3657 | } | |
3658 | goto error; | |
3659 | } | |
3660 | ||
3661 | lttng_ht_add_unique_u64(app->token_to_event_notifier_rule_ht, | |
3662 | &ua_event_notifier_rule->node); | |
3663 | ||
3664 | DBG2("UST app create token event rule completed: app = '%s' (ppid: %d), token = %" PRIu64, | |
267d66aa | 3665 | app->name, app->ppid, lttng_trigger_get_tracer_token(trigger)); |
993578ff JR |
3666 | |
3667 | end: | |
3668 | return ret; | |
3669 | ||
3670 | error: | |
3671 | /* The RCU read side lock is already being held by the caller. */ | |
3672 | delete_ust_app_event_notifier_rule(-1, ua_event_notifier_rule, app); | |
3673 | return ret; | |
3674 | } | |
3675 | ||
5b4a0ec0 DG |
3676 | /* |
3677 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 3678 | * |
7972aab2 | 3679 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
3680 | */ |
3681 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
ad7a9107 | 3682 | struct ust_app *app, struct consumer_output *consumer) |
5b4a0ec0 DG |
3683 | { |
3684 | int ret = 0; | |
ffe60014 | 3685 | struct ust_app_channel *metadata; |
d88aee68 | 3686 | struct consumer_socket *socket; |
7972aab2 | 3687 | struct ust_registry_session *registry; |
e32d7f27 | 3688 | struct ltt_session *session = NULL; |
5b4a0ec0 | 3689 | |
ffe60014 DG |
3690 | assert(ua_sess); |
3691 | assert(app); | |
d88aee68 | 3692 | assert(consumer); |
5b4a0ec0 | 3693 | |
7972aab2 | 3694 | registry = get_session_registry(ua_sess); |
fad1ed2f | 3695 | /* The UST app session is held registry shall not be null. */ |
7972aab2 DG |
3696 | assert(registry); |
3697 | ||
ce34fcd0 MD |
3698 | pthread_mutex_lock(®istry->lock); |
3699 | ||
1b532a60 DG |
3700 | /* Metadata already exists for this registry or it was closed previously */ |
3701 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
3702 | ret = 0; |
3703 | goto error; | |
5b4a0ec0 DG |
3704 | } |
3705 | ||
ffe60014 | 3706 | /* Allocate UST metadata */ |
d0b96690 | 3707 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
3708 | if (!metadata) { |
3709 | /* malloc() failed */ | |
3710 | ret = -ENOMEM; | |
3711 | goto error; | |
3712 | } | |
5b4a0ec0 | 3713 | |
ad7a9107 | 3714 | memcpy(&metadata->attr, &ua_sess->metadata_attr, sizeof(metadata->attr)); |
5b4a0ec0 | 3715 | |
7972aab2 DG |
3716 | /* Need one fd for the channel. */ |
3717 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
3718 | if (ret < 0) { | |
3719 | ERR("Exhausted number of available FD upon create metadata"); | |
3720 | goto error; | |
3721 | } | |
3722 | ||
4dc3dfc5 DG |
3723 | /* Get the right consumer socket for the application. */ |
3724 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
3725 | if (!socket) { | |
3726 | ret = -EINVAL; | |
3727 | goto error_consumer; | |
3728 | } | |
3729 | ||
331744e3 JD |
3730 | /* |
3731 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
3732 | * to the registry *before* we ask the consumer so we avoid the race of the | |
3733 | * consumer requesting the metadata and the ask_channel call on our side | |
3734 | * did not returned yet. | |
3735 | */ | |
3736 | registry->metadata_key = metadata->key; | |
3737 | ||
e098433c JG |
3738 | session = session_find_by_id(ua_sess->tracing_id); |
3739 | assert(session); | |
3740 | ||
3741 | assert(pthread_mutex_trylock(&session->lock)); | |
3742 | assert(session_trylock_list()); | |
3743 | ||
d88aee68 DG |
3744 | /* |
3745 | * Ask the metadata channel creation to the consumer. The metadata object | |
3746 | * will be created by the consumer and kept their. However, the stream is | |
3747 | * never added or monitored until we do a first push metadata to the | |
3748 | * consumer. | |
3749 | */ | |
7972aab2 | 3750 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
d2956687 | 3751 | registry, session->current_trace_chunk); |
d88aee68 | 3752 | if (ret < 0) { |
f2a444f1 DG |
3753 | /* Nullify the metadata key so we don't try to close it later on. */ |
3754 | registry->metadata_key = 0; | |
d88aee68 DG |
3755 | goto error_consumer; |
3756 | } | |
3757 | ||
3758 | /* | |
3759 | * The setup command will make the metadata stream be sent to the relayd, | |
3760 | * if applicable, and the thread managing the metadatas. This is important | |
3761 | * because after this point, if an error occurs, the only way the stream | |
3762 | * can be deleted is to be monitored in the consumer. | |
3763 | */ | |
7972aab2 | 3764 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 3765 | if (ret < 0) { |
f2a444f1 DG |
3766 | /* Nullify the metadata key so we don't try to close it later on. */ |
3767 | registry->metadata_key = 0; | |
d88aee68 | 3768 | goto error_consumer; |
5b4a0ec0 DG |
3769 | } |
3770 | ||
7972aab2 DG |
3771 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
3772 | metadata->key, app->pid); | |
5b4a0ec0 | 3773 | |
d88aee68 | 3774 | error_consumer: |
b80f0b6c | 3775 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 3776 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 3777 | error: |
ce34fcd0 | 3778 | pthread_mutex_unlock(®istry->lock); |
e32d7f27 JG |
3779 | if (session) { |
3780 | session_put(session); | |
3781 | } | |
ffe60014 | 3782 | return ret; |
5b4a0ec0 DG |
3783 | } |
3784 | ||
5b4a0ec0 | 3785 | /* |
d88aee68 DG |
3786 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
3787 | * acquired before calling this function. | |
5b4a0ec0 DG |
3788 | */ |
3789 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
3790 | { | |
d88aee68 | 3791 | struct ust_app *app = NULL; |
bec39940 DG |
3792 | struct lttng_ht_node_ulong *node; |
3793 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 3794 | |
bec39940 DG |
3795 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
3796 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
3797 | if (node == NULL) { |
3798 | DBG2("UST app no found with pid %d", pid); | |
3799 | goto error; | |
3800 | } | |
5b4a0ec0 DG |
3801 | |
3802 | DBG2("Found UST app by pid %d", pid); | |
3803 | ||
d88aee68 | 3804 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
3805 | |
3806 | error: | |
d88aee68 | 3807 | return app; |
5b4a0ec0 DG |
3808 | } |
3809 | ||
d88aee68 DG |
3810 | /* |
3811 | * Allocate and init an UST app object using the registration information and | |
3812 | * the command socket. This is called when the command socket connects to the | |
3813 | * session daemon. | |
3814 | * | |
3815 | * The object is returned on success or else NULL. | |
3816 | */ | |
d0b96690 | 3817 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 3818 | { |
5e2abfaf | 3819 | int ret; |
d0b96690 | 3820 | struct ust_app *lta = NULL; |
da873412 | 3821 | struct lttng_pipe *event_notifier_event_source_pipe = NULL; |
d0b96690 DG |
3822 | |
3823 | assert(msg); | |
3824 | assert(sock >= 0); | |
3825 | ||
3826 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 3827 | |
173af62f DG |
3828 | if ((msg->bits_per_long == 64 && |
3829 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
3830 | || (msg->bits_per_long == 32 && | |
3831 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 3832 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
3833 | "%d-bit long, but no consumerd for this size is available.\n", |
3834 | msg->name, msg->pid, msg->bits_per_long); | |
3835 | goto error; | |
3f2c5fcc | 3836 | } |
d0b96690 | 3837 | |
5e2abfaf JG |
3838 | /* |
3839 | * Reserve the two file descriptors of the event source pipe. The write | |
3840 | * end will be closed once it is passed to the application, at which | |
3841 | * point a single 'put' will be performed. | |
3842 | */ | |
3843 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
3844 | if (ret) { | |
3845 | ERR("Failed to reserve two file descriptors for the event source pipe while creating a new application instance: app = '%s' (ppid: %d)", | |
3846 | msg->name, (int) msg->ppid); | |
3847 | goto error; | |
3848 | } | |
3849 | ||
da873412 JR |
3850 | event_notifier_event_source_pipe = lttng_pipe_open(FD_CLOEXEC); |
3851 | if (!event_notifier_event_source_pipe) { | |
3852 | PERROR("Failed to open application event source pipe: '%s' (ppid = %d)", | |
3853 | msg->name, msg->ppid); | |
3854 | goto error; | |
3855 | } | |
3856 | ||
5b4a0ec0 DG |
3857 | lta = zmalloc(sizeof(struct ust_app)); |
3858 | if (lta == NULL) { | |
3859 | PERROR("malloc"); | |
da873412 | 3860 | goto error_free_pipe; |
5b4a0ec0 DG |
3861 | } |
3862 | ||
da873412 JR |
3863 | lta->event_notifier_group.event_pipe = event_notifier_event_source_pipe; |
3864 | ||
5b4a0ec0 DG |
3865 | lta->ppid = msg->ppid; |
3866 | lta->uid = msg->uid; | |
3867 | lta->gid = msg->gid; | |
d0b96690 | 3868 | |
7753dea8 | 3869 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
3870 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
3871 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
3872 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
3873 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
3874 | lta->long_alignment = msg->long_alignment; | |
3875 | lta->byte_order = msg->byte_order; | |
3876 | ||
5b4a0ec0 DG |
3877 | lta->v_major = msg->major; |
3878 | lta->v_minor = msg->minor; | |
d9bf3ca4 | 3879 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 | 3880 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
10b56aef | 3881 | lta->ust_sessions_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3882 | lta->notify_sock = -1; |
993578ff | 3883 | lta->token_to_event_notifier_rule_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d88aee68 DG |
3884 | |
3885 | /* Copy name and make sure it's NULL terminated. */ | |
3886 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
3887 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
3888 | ||
3889 | /* | |
3890 | * Before this can be called, when receiving the registration information, | |
3891 | * the application compatibility is checked. So, at this point, the | |
3892 | * application can work with this session daemon. | |
3893 | */ | |
d0b96690 | 3894 | lta->compatible = 1; |
5b4a0ec0 | 3895 | |
852d0037 | 3896 | lta->pid = msg->pid; |
d0b96690 | 3897 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 3898 | lta->sock = sock; |
fb45065e | 3899 | pthread_mutex_init(<a->sock_lock, NULL); |
d0b96690 | 3900 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 3901 | |
d42f20df | 3902 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
d0b96690 | 3903 | return lta; |
da873412 JR |
3904 | |
3905 | error_free_pipe: | |
3906 | lttng_pipe_destroy(event_notifier_event_source_pipe); | |
5e2abfaf | 3907 | lttng_fd_put(LTTNG_FD_APPS, 2); |
da873412 JR |
3908 | error: |
3909 | return NULL; | |
d0b96690 DG |
3910 | } |
3911 | ||
d88aee68 DG |
3912 | /* |
3913 | * For a given application object, add it to every hash table. | |
3914 | */ | |
d0b96690 DG |
3915 | void ust_app_add(struct ust_app *app) |
3916 | { | |
3917 | assert(app); | |
3918 | assert(app->notify_sock >= 0); | |
3919 | ||
940c4592 JR |
3920 | app->registration_time = time(NULL); |
3921 | ||
5b4a0ec0 | 3922 | rcu_read_lock(); |
852d0037 DG |
3923 | |
3924 | /* | |
3925 | * On a re-registration, we want to kick out the previous registration of | |
3926 | * that pid | |
3927 | */ | |
d0b96690 | 3928 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
3929 | |
3930 | /* | |
3931 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
3932 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
3933 | * already in the table. | |
3934 | */ | |
d0b96690 | 3935 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 3936 | |
d0b96690 DG |
3937 | /* Add application to the notify socket hash table. */ |
3938 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
3939 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 3940 | |
d0b96690 | 3941 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
3942 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
3943 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
3944 | app->v_minor); | |
5b4a0ec0 | 3945 | |
d0b96690 DG |
3946 | rcu_read_unlock(); |
3947 | } | |
3948 | ||
d88aee68 DG |
3949 | /* |
3950 | * Set the application version into the object. | |
3951 | * | |
3952 | * Return 0 on success else a negative value either an errno code or a | |
3953 | * LTTng-UST error code. | |
3954 | */ | |
d0b96690 DG |
3955 | int ust_app_version(struct ust_app *app) |
3956 | { | |
d88aee68 DG |
3957 | int ret; |
3958 | ||
d0b96690 | 3959 | assert(app); |
d88aee68 | 3960 | |
fb45065e | 3961 | pthread_mutex_lock(&app->sock_lock); |
d88aee68 | 3962 | ret = ustctl_tracer_version(app->sock, &app->version); |
fb45065e | 3963 | pthread_mutex_unlock(&app->sock_lock); |
d88aee68 DG |
3964 | if (ret < 0) { |
3965 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
5368d366 | 3966 | ERR("UST app %d version failed with ret %d", app->sock, ret); |
d88aee68 | 3967 | } else { |
5368d366 | 3968 | DBG3("UST app %d version failed. Application is dead", app->sock); |
d88aee68 DG |
3969 | } |
3970 | } | |
3971 | ||
3972 | return ret; | |
5b4a0ec0 DG |
3973 | } |
3974 | ||
da873412 JR |
3975 | /* |
3976 | * Setup the base event notifier group. | |
3977 | * | |
3978 | * Return 0 on success else a negative value either an errno code or a | |
3979 | * LTTng-UST error code. | |
3980 | */ | |
3981 | int ust_app_setup_event_notifier_group(struct ust_app *app) | |
3982 | { | |
3983 | int ret; | |
3984 | int event_pipe_write_fd; | |
3985 | struct lttng_ust_object_data *event_notifier_group = NULL; | |
3986 | enum lttng_error_code lttng_ret; | |
3987 | ||
3988 | assert(app); | |
3989 | ||
3990 | /* Get the write side of the pipe. */ | |
3991 | event_pipe_write_fd = lttng_pipe_get_writefd( | |
3992 | app->event_notifier_group.event_pipe); | |
3993 | ||
3994 | pthread_mutex_lock(&app->sock_lock); | |
3995 | ret = ustctl_create_event_notifier_group(app->sock, | |
3996 | event_pipe_write_fd, &event_notifier_group); | |
3997 | pthread_mutex_unlock(&app->sock_lock); | |
3998 | if (ret < 0) { | |
3999 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
4000 | ERR("Failed to create application event notifier group: ret = %d, app socket fd = %d, event_pipe_write_fd = %d", | |
4001 | ret, app->sock, event_pipe_write_fd); | |
4002 | } else { | |
4003 | DBG("Failed to create application event notifier group (application is dead): app socket fd = %d", | |
4004 | app->sock); | |
4005 | } | |
4006 | ||
4007 | goto error; | |
4008 | } | |
4009 | ||
5d4193fd JG |
4010 | ret = lttng_pipe_write_close(app->event_notifier_group.event_pipe); |
4011 | if (ret) { | |
4012 | ERR("Failed to close write end of the application's event source pipe: app = '%s' (ppid = %d)", | |
4013 | app->name, app->ppid); | |
4014 | goto error; | |
4015 | } | |
4016 | ||
5e2abfaf JG |
4017 | /* |
4018 | * Release the file descriptor that was reserved for the write-end of | |
4019 | * the pipe. | |
4020 | */ | |
4021 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
4022 | ||
da873412 JR |
4023 | lttng_ret = notification_thread_command_add_tracer_event_source( |
4024 | notification_thread_handle, | |
4025 | lttng_pipe_get_readfd(app->event_notifier_group.event_pipe), | |
4026 | LTTNG_DOMAIN_UST); | |
4027 | if (lttng_ret != LTTNG_OK) { | |
4028 | ERR("Failed to add tracer event source to notification thread"); | |
4029 | ret = - 1; | |
4030 | goto error; | |
4031 | } | |
4032 | ||
4033 | /* Assign handle only when the complete setup is valid. */ | |
4034 | app->event_notifier_group.object = event_notifier_group; | |
4035 | return ret; | |
4036 | ||
4037 | error: | |
4038 | ustctl_release_object(app->sock, app->event_notifier_group.object); | |
4039 | free(app->event_notifier_group.object); | |
4040 | return ret; | |
4041 | } | |
4042 | ||
5b4a0ec0 DG |
4043 | /* |
4044 | * Unregister app by removing it from the global traceable app list and freeing | |
4045 | * the data struct. | |
4046 | * | |
4047 | * The socket is already closed at this point so no close to sock. | |
4048 | */ | |
4049 | void ust_app_unregister(int sock) | |
4050 | { | |
4051 | struct ust_app *lta; | |
bec39940 | 4052 | struct lttng_ht_node_ulong *node; |
c4b88406 | 4053 | struct lttng_ht_iter ust_app_sock_iter; |
bec39940 | 4054 | struct lttng_ht_iter iter; |
d42f20df | 4055 | struct ust_app_session *ua_sess; |
525b0740 | 4056 | int ret; |
5b4a0ec0 DG |
4057 | |
4058 | rcu_read_lock(); | |
886459c6 | 4059 | |
5b4a0ec0 | 4060 | /* Get the node reference for a call_rcu */ |
c4b88406 MD |
4061 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &ust_app_sock_iter); |
4062 | node = lttng_ht_iter_get_node_ulong(&ust_app_sock_iter); | |
d0b96690 | 4063 | assert(node); |
284d8f55 | 4064 | |
852d0037 | 4065 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
4066 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
4067 | ||
d88aee68 | 4068 | /* |
ce34fcd0 MD |
4069 | * For per-PID buffers, perform "push metadata" and flush all |
4070 | * application streams before removing app from hash tables, | |
4071 | * ensuring proper behavior of data_pending check. | |
c4b88406 | 4072 | * Remove sessions so they are not visible during deletion. |
d88aee68 | 4073 | */ |
d42f20df DG |
4074 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, |
4075 | node.node) { | |
7972aab2 DG |
4076 | struct ust_registry_session *registry; |
4077 | ||
d42f20df DG |
4078 | ret = lttng_ht_del(lta->sessions, &iter); |
4079 | if (ret) { | |
4080 | /* The session was already removed so scheduled for teardown. */ | |
4081 | continue; | |
4082 | } | |
4083 | ||
ce34fcd0 MD |
4084 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { |
4085 | (void) ust_app_flush_app_session(lta, ua_sess); | |
4086 | } | |
c4b88406 | 4087 | |
d42f20df DG |
4088 | /* |
4089 | * Add session to list for teardown. This is safe since at this point we | |
4090 | * are the only one using this list. | |
4091 | */ | |
d88aee68 DG |
4092 | pthread_mutex_lock(&ua_sess->lock); |
4093 | ||
b161602a MD |
4094 | if (ua_sess->deleted) { |
4095 | pthread_mutex_unlock(&ua_sess->lock); | |
4096 | continue; | |
4097 | } | |
4098 | ||
d88aee68 DG |
4099 | /* |
4100 | * Normally, this is done in the delete session process which is | |
4101 | * executed in the call rcu below. However, upon registration we can't | |
4102 | * afford to wait for the grace period before pushing data or else the | |
4103 | * data pending feature can race between the unregistration and stop | |
4104 | * command where the data pending command is sent *before* the grace | |
4105 | * period ended. | |
4106 | * | |
4107 | * The close metadata below nullifies the metadata pointer in the | |
4108 | * session so the delete session will NOT push/close a second time. | |
4109 | */ | |
7972aab2 | 4110 | registry = get_session_registry(ua_sess); |
ce34fcd0 | 4111 | if (registry) { |
7972aab2 DG |
4112 | /* Push metadata for application before freeing the application. */ |
4113 | (void) push_metadata(registry, ua_sess->consumer); | |
4114 | ||
4115 | /* | |
4116 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
4117 | * metadata only on destroy trace session in this case. Also, the |
4118 | * previous push metadata could have flag the metadata registry to | |
4119 | * close so don't send a close command if closed. | |
7972aab2 | 4120 | */ |
ce34fcd0 | 4121 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
4122 | /* And ask to close it for this session registry. */ |
4123 | (void) close_metadata(registry, ua_sess->consumer); | |
4124 | } | |
4125 | } | |
d42f20df | 4126 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
c4b88406 | 4127 | |
d88aee68 | 4128 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
4129 | } |
4130 | ||
c4b88406 MD |
4131 | /* Remove application from PID hash table */ |
4132 | ret = lttng_ht_del(ust_app_ht_by_sock, &ust_app_sock_iter); | |
4133 | assert(!ret); | |
4134 | ||
4135 | /* | |
4136 | * Remove application from notify hash table. The thread handling the | |
4137 | * notify socket could have deleted the node so ignore on error because | |
c48239ca JG |
4138 | * either way it's valid. The close of that socket is handled by the |
4139 | * apps_notify_thread. | |
c4b88406 MD |
4140 | */ |
4141 | iter.iter.node = <a->notify_sock_n.node; | |
4142 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
4143 | ||
4144 | /* | |
4145 | * Ignore return value since the node might have been removed before by an | |
4146 | * add replace during app registration because the PID can be reassigned by | |
4147 | * the OS. | |
4148 | */ | |
4149 | iter.iter.node = <a->pid_n.node; | |
4150 | ret = lttng_ht_del(ust_app_ht, &iter); | |
4151 | if (ret) { | |
4152 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
4153 | lta->pid); | |
4154 | } | |
4155 | ||
852d0037 DG |
4156 | /* Free memory */ |
4157 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
4158 | ||
5b4a0ec0 DG |
4159 | rcu_read_unlock(); |
4160 | return; | |
284d8f55 DG |
4161 | } |
4162 | ||
5b4a0ec0 DG |
4163 | /* |
4164 | * Fill events array with all events name of all registered apps. | |
4165 | */ | |
4166 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 4167 | { |
5b4a0ec0 DG |
4168 | int ret, handle; |
4169 | size_t nbmem, count = 0; | |
bec39940 | 4170 | struct lttng_ht_iter iter; |
5b4a0ec0 | 4171 | struct ust_app *app; |
c617c0c6 | 4172 | struct lttng_event *tmp_event; |
421cb601 | 4173 | |
5b4a0ec0 | 4174 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
4175 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
4176 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
4177 | PERROR("zmalloc ust app events"); |
4178 | ret = -ENOMEM; | |
421cb601 DG |
4179 | goto error; |
4180 | } | |
4181 | ||
5b4a0ec0 | 4182 | rcu_read_lock(); |
421cb601 | 4183 | |
852d0037 | 4184 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 4185 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 4186 | |
840cb59c | 4187 | health_code_update(); |
86acf0da | 4188 | |
e0c7ec2b DG |
4189 | if (!app->compatible) { |
4190 | /* | |
4191 | * TODO: In time, we should notice the caller of this error by | |
4192 | * telling him that this is a version error. | |
4193 | */ | |
4194 | continue; | |
4195 | } | |
fb45065e | 4196 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4197 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 4198 | if (handle < 0) { |
ffe60014 DG |
4199 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
4200 | ERR("UST app list events getting handle failed for app pid %d", | |
4201 | app->pid); | |
4202 | } | |
fb45065e | 4203 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 DG |
4204 | continue; |
4205 | } | |
421cb601 | 4206 | |
852d0037 | 4207 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 4208 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
4209 | /* Handle ustctl error. */ |
4210 | if (ret < 0) { | |
fb45065e MD |
4211 | int release_ret; |
4212 | ||
a2ba1ab0 | 4213 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
4214 | ERR("UST app tp list get failed for app %d with ret %d", |
4215 | app->sock, ret); | |
4216 | } else { | |
4217 | DBG3("UST app tp list get failed. Application is dead"); | |
3757b385 DG |
4218 | /* |
4219 | * This is normal behavior, an application can die during the | |
4220 | * creation process. Don't report an error so the execution can | |
4221 | * continue normally. Continue normal execution. | |
4222 | */ | |
4223 | break; | |
ffe60014 | 4224 | } |
98f595d4 | 4225 | free(tmp_event); |
fb45065e | 4226 | release_ret = ustctl_release_handle(app->sock, handle); |
68313703 JG |
4227 | if (release_ret < 0 && |
4228 | release_ret != -LTTNG_UST_ERR_EXITING && | |
4229 | release_ret != -EPIPE) { | |
fb45065e MD |
4230 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
4231 | } | |
4232 | pthread_mutex_unlock(&app->sock_lock); | |
ffe60014 DG |
4233 | goto rcu_error; |
4234 | } | |
4235 | ||
840cb59c | 4236 | health_code_update(); |
815564d8 | 4237 | if (count >= nbmem) { |
d7b3776f | 4238 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
4239 | struct lttng_event *new_tmp_event; |
4240 | size_t new_nbmem; | |
4241 | ||
4242 | new_nbmem = nbmem << 1; | |
4243 | DBG2("Reallocating event list from %zu to %zu entries", | |
4244 | nbmem, new_nbmem); | |
4245 | new_tmp_event = realloc(tmp_event, | |
4246 | new_nbmem * sizeof(struct lttng_event)); | |
4247 | if (new_tmp_event == NULL) { | |
fb45065e MD |
4248 | int release_ret; |
4249 | ||
5b4a0ec0 | 4250 | PERROR("realloc ust app events"); |
c617c0c6 | 4251 | free(tmp_event); |
5b4a0ec0 | 4252 | ret = -ENOMEM; |
fb45065e | 4253 | release_ret = ustctl_release_handle(app->sock, handle); |
68313703 JG |
4254 | if (release_ret < 0 && |
4255 | release_ret != -LTTNG_UST_ERR_EXITING && | |
4256 | release_ret != -EPIPE) { | |
fb45065e MD |
4257 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
4258 | } | |
4259 | pthread_mutex_unlock(&app->sock_lock); | |
5b4a0ec0 DG |
4260 | goto rcu_error; |
4261 | } | |
53efb85a MD |
4262 | /* Zero the new memory */ |
4263 | memset(new_tmp_event + nbmem, 0, | |
4264 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
4265 | nbmem = new_nbmem; | |
4266 | tmp_event = new_tmp_event; | |
5b4a0ec0 | 4267 | } |
c617c0c6 MD |
4268 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
4269 | tmp_event[count].loglevel = uiter.loglevel; | |
4270 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
4271 | tmp_event[count].pid = app->pid; | |
4272 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 4273 | count++; |
421cb601 | 4274 | } |
fb45065e MD |
4275 | ret = ustctl_release_handle(app->sock, handle); |
4276 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 | 4277 | if (ret < 0 && ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
fb45065e MD |
4278 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
4279 | } | |
421cb601 DG |
4280 | } |
4281 | ||
5b4a0ec0 | 4282 | ret = count; |
c617c0c6 | 4283 | *events = tmp_event; |
421cb601 | 4284 | |
5b4a0ec0 | 4285 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 4286 | |
5b4a0ec0 DG |
4287 | rcu_error: |
4288 | rcu_read_unlock(); | |
421cb601 | 4289 | error: |
840cb59c | 4290 | health_code_update(); |
5b4a0ec0 | 4291 | return ret; |
421cb601 DG |
4292 | } |
4293 | ||
f37d259d MD |
4294 | /* |
4295 | * Fill events array with all events name of all registered apps. | |
4296 | */ | |
4297 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
4298 | { | |
4299 | int ret, handle; | |
4300 | size_t nbmem, count = 0; | |
4301 | struct lttng_ht_iter iter; | |
4302 | struct ust_app *app; | |
c617c0c6 | 4303 | struct lttng_event_field *tmp_event; |
f37d259d MD |
4304 | |
4305 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
4306 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
4307 | if (tmp_event == NULL) { | |
f37d259d MD |
4308 | PERROR("zmalloc ust app event fields"); |
4309 | ret = -ENOMEM; | |
4310 | goto error; | |
4311 | } | |
4312 | ||
4313 | rcu_read_lock(); | |
4314 | ||
4315 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4316 | struct lttng_ust_field_iter uiter; | |
4317 | ||
840cb59c | 4318 | health_code_update(); |
86acf0da | 4319 | |
f37d259d MD |
4320 | if (!app->compatible) { |
4321 | /* | |
4322 | * TODO: In time, we should notice the caller of this error by | |
4323 | * telling him that this is a version error. | |
4324 | */ | |
4325 | continue; | |
4326 | } | |
fb45065e | 4327 | pthread_mutex_lock(&app->sock_lock); |
f37d259d MD |
4328 | handle = ustctl_tracepoint_field_list(app->sock); |
4329 | if (handle < 0) { | |
ffe60014 DG |
4330 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
4331 | ERR("UST app list field getting handle failed for app pid %d", | |
4332 | app->pid); | |
4333 | } | |
fb45065e | 4334 | pthread_mutex_unlock(&app->sock_lock); |
f37d259d MD |
4335 | continue; |
4336 | } | |
4337 | ||
4338 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 4339 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
4340 | /* Handle ustctl error. */ |
4341 | if (ret < 0) { | |
fb45065e MD |
4342 | int release_ret; |
4343 | ||
a2ba1ab0 | 4344 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
4345 | ERR("UST app tp list field failed for app %d with ret %d", |
4346 | app->sock, ret); | |
4347 | } else { | |
4348 | DBG3("UST app tp list field failed. Application is dead"); | |
3757b385 DG |
4349 | /* |
4350 | * This is normal behavior, an application can die during the | |
4351 | * creation process. Don't report an error so the execution can | |
98f595d4 | 4352 | * continue normally. Reset list and count for next app. |
3757b385 DG |
4353 | */ |
4354 | break; | |
ffe60014 | 4355 | } |
98f595d4 | 4356 | free(tmp_event); |
fb45065e MD |
4357 | release_ret = ustctl_release_handle(app->sock, handle); |
4358 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
4359 | if (release_ret < 0 && |
4360 | release_ret != -LTTNG_UST_ERR_EXITING && | |
4361 | release_ret != -EPIPE) { | |
fb45065e MD |
4362 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
4363 | } | |
ffe60014 DG |
4364 | goto rcu_error; |
4365 | } | |
4366 | ||
840cb59c | 4367 | health_code_update(); |
f37d259d | 4368 | if (count >= nbmem) { |
d7b3776f | 4369 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
4370 | struct lttng_event_field *new_tmp_event; |
4371 | size_t new_nbmem; | |
4372 | ||
4373 | new_nbmem = nbmem << 1; | |
4374 | DBG2("Reallocating event field list from %zu to %zu entries", | |
4375 | nbmem, new_nbmem); | |
4376 | new_tmp_event = realloc(tmp_event, | |
4377 | new_nbmem * sizeof(struct lttng_event_field)); | |
4378 | if (new_tmp_event == NULL) { | |
fb45065e MD |
4379 | int release_ret; |
4380 | ||
f37d259d | 4381 | PERROR("realloc ust app event fields"); |
c617c0c6 | 4382 | free(tmp_event); |
f37d259d | 4383 | ret = -ENOMEM; |
fb45065e MD |
4384 | release_ret = ustctl_release_handle(app->sock, handle); |
4385 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
4386 | if (release_ret && |
4387 | release_ret != -LTTNG_UST_ERR_EXITING && | |
4388 | release_ret != -EPIPE) { | |
fb45065e MD |
4389 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
4390 | } | |
f37d259d MD |
4391 | goto rcu_error; |
4392 | } | |
53efb85a MD |
4393 | /* Zero the new memory */ |
4394 | memset(new_tmp_event + nbmem, 0, | |
4395 | (new_nbmem - nbmem) * sizeof(struct lttng_event_field)); | |
4396 | nbmem = new_nbmem; | |
4397 | tmp_event = new_tmp_event; | |
f37d259d | 4398 | } |
f37d259d | 4399 | |
c617c0c6 | 4400 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
2e84128e DG |
4401 | /* Mapping between these enums matches 1 to 1. */ |
4402 | tmp_event[count].type = (enum lttng_event_field_type) uiter.type; | |
c617c0c6 | 4403 | tmp_event[count].nowrite = uiter.nowrite; |
f37d259d | 4404 | |
c617c0c6 MD |
4405 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
4406 | tmp_event[count].event.loglevel = uiter.loglevel; | |
2e84128e | 4407 | tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; |
c617c0c6 MD |
4408 | tmp_event[count].event.pid = app->pid; |
4409 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
4410 | count++; |
4411 | } | |
fb45065e MD |
4412 | ret = ustctl_release_handle(app->sock, handle); |
4413 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
4414 | if (ret < 0 && |
4415 | ret != -LTTNG_UST_ERR_EXITING && | |
4416 | ret != -EPIPE) { | |
fb45065e MD |
4417 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
4418 | } | |
f37d259d MD |
4419 | } |
4420 | ||
4421 | ret = count; | |
c617c0c6 | 4422 | *fields = tmp_event; |
f37d259d MD |
4423 | |
4424 | DBG2("UST app list event fields done (%zu events)", count); | |
4425 | ||
4426 | rcu_error: | |
4427 | rcu_read_unlock(); | |
4428 | error: | |
840cb59c | 4429 | health_code_update(); |
f37d259d MD |
4430 | return ret; |
4431 | } | |
4432 | ||
5b4a0ec0 DG |
4433 | /* |
4434 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
4435 | * |
4436 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
4437 | */ |
4438 | void ust_app_clean_list(void) | |
421cb601 | 4439 | { |
5b4a0ec0 | 4440 | int ret; |
659ed79f | 4441 | struct ust_app *app; |
bec39940 | 4442 | struct lttng_ht_iter iter; |
421cb601 | 4443 | |
5b4a0ec0 | 4444 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 4445 | |
5b4a0ec0 | 4446 | rcu_read_lock(); |
421cb601 | 4447 | |
faadaa3a JG |
4448 | /* Cleanup notify socket hash table */ |
4449 | if (ust_app_ht_by_notify_sock) { | |
4450 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
4451 | notify_sock_n.node) { | |
b69a1b40 JG |
4452 | /* |
4453 | * Assert that all notifiers are gone as all triggers | |
4454 | * are unregistered prior to this clean-up. | |
4455 | */ | |
4456 | assert(lttng_ht_get_count(app->token_to_event_notifier_rule_ht) == 0); | |
faadaa3a | 4457 | |
faadaa3a JG |
4458 | ust_app_notify_sock_unregister(app->notify_sock); |
4459 | } | |
4460 | } | |
4461 | ||
f1b711c4 MD |
4462 | if (ust_app_ht) { |
4463 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4464 | ret = lttng_ht_del(ust_app_ht, &iter); | |
4465 | assert(!ret); | |
4466 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
4467 | } | |
421cb601 DG |
4468 | } |
4469 | ||
852d0037 | 4470 | /* Cleanup socket hash table */ |
f1b711c4 MD |
4471 | if (ust_app_ht_by_sock) { |
4472 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, | |
4473 | sock_n.node) { | |
4474 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); | |
4475 | assert(!ret); | |
4476 | } | |
bec39940 | 4477 | } |
852d0037 | 4478 | |
36b588ed | 4479 | rcu_read_unlock(); |
d88aee68 | 4480 | |
bec39940 | 4481 | /* Destroy is done only when the ht is empty */ |
f1b711c4 MD |
4482 | if (ust_app_ht) { |
4483 | ht_cleanup_push(ust_app_ht); | |
4484 | } | |
4485 | if (ust_app_ht_by_sock) { | |
4486 | ht_cleanup_push(ust_app_ht_by_sock); | |
4487 | } | |
4488 | if (ust_app_ht_by_notify_sock) { | |
4489 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
4490 | } | |
5b4a0ec0 DG |
4491 | } |
4492 | ||
4493 | /* | |
4494 | * Init UST app hash table. | |
4495 | */ | |
57703f6e | 4496 | int ust_app_ht_alloc(void) |
5b4a0ec0 | 4497 | { |
bec39940 | 4498 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
4499 | if (!ust_app_ht) { |
4500 | return -1; | |
4501 | } | |
852d0037 | 4502 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
4503 | if (!ust_app_ht_by_sock) { |
4504 | return -1; | |
4505 | } | |
d0b96690 | 4506 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
4507 | if (!ust_app_ht_by_notify_sock) { |
4508 | return -1; | |
4509 | } | |
4510 | return 0; | |
421cb601 DG |
4511 | } |
4512 | ||
78f0bacd DG |
4513 | /* |
4514 | * For a specific UST session, disable the channel for all registered apps. | |
4515 | */ | |
35a9059d | 4516 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
4517 | struct ltt_ust_channel *uchan) |
4518 | { | |
4519 | int ret = 0; | |
bec39940 DG |
4520 | struct lttng_ht_iter iter; |
4521 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
4522 | struct ust_app *app; |
4523 | struct ust_app_session *ua_sess; | |
8535a6d9 | 4524 | struct ust_app_channel *ua_chan; |
78f0bacd | 4525 | |
88e3c2f5 | 4526 | assert(usess->active); |
d9bf3ca4 | 4527 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 4528 | uchan->name, usess->id); |
78f0bacd DG |
4529 | |
4530 | rcu_read_lock(); | |
4531 | ||
4532 | /* For every registered applications */ | |
852d0037 | 4533 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 4534 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
4535 | if (!app->compatible) { |
4536 | /* | |
4537 | * TODO: In time, we should notice the caller of this error by | |
4538 | * telling him that this is a version error. | |
4539 | */ | |
4540 | continue; | |
4541 | } | |
78f0bacd DG |
4542 | ua_sess = lookup_session_by_app(usess, app); |
4543 | if (ua_sess == NULL) { | |
4544 | continue; | |
4545 | } | |
4546 | ||
8535a6d9 | 4547 | /* Get channel */ |
bec39940 DG |
4548 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4549 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
4550 | /* If the session if found for the app, the channel must be there */ |
4551 | assert(ua_chan_node); | |
4552 | ||
4553 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4554 | /* The channel must not be already disabled */ | |
4555 | assert(ua_chan->enabled == 1); | |
4556 | ||
4557 | /* Disable channel onto application */ | |
4558 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
4559 | if (ret < 0) { |
4560 | /* XXX: We might want to report this error at some point... */ | |
4561 | continue; | |
4562 | } | |
4563 | } | |
4564 | ||
4565 | rcu_read_unlock(); | |
78f0bacd DG |
4566 | return ret; |
4567 | } | |
4568 | ||
4569 | /* | |
4570 | * For a specific UST session, enable the channel for all registered apps. | |
4571 | */ | |
35a9059d | 4572 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
4573 | struct ltt_ust_channel *uchan) |
4574 | { | |
4575 | int ret = 0; | |
bec39940 | 4576 | struct lttng_ht_iter iter; |
78f0bacd DG |
4577 | struct ust_app *app; |
4578 | struct ust_app_session *ua_sess; | |
4579 | ||
88e3c2f5 | 4580 | assert(usess->active); |
d9bf3ca4 | 4581 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 4582 | uchan->name, usess->id); |
78f0bacd DG |
4583 | |
4584 | rcu_read_lock(); | |
4585 | ||
4586 | /* For every registered applications */ | |
852d0037 | 4587 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4588 | if (!app->compatible) { |
4589 | /* | |
4590 | * TODO: In time, we should notice the caller of this error by | |
4591 | * telling him that this is a version error. | |
4592 | */ | |
4593 | continue; | |
4594 | } | |
78f0bacd DG |
4595 | ua_sess = lookup_session_by_app(usess, app); |
4596 | if (ua_sess == NULL) { | |
4597 | continue; | |
4598 | } | |
4599 | ||
4600 | /* Enable channel onto application */ | |
4601 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
4602 | if (ret < 0) { | |
4603 | /* XXX: We might want to report this error at some point... */ | |
4604 | continue; | |
4605 | } | |
4606 | } | |
4607 | ||
4608 | rcu_read_unlock(); | |
78f0bacd DG |
4609 | return ret; |
4610 | } | |
4611 | ||
b0a40d28 DG |
4612 | /* |
4613 | * Disable an event in a channel and for a specific session. | |
4614 | */ | |
35a9059d DG |
4615 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
4616 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
4617 | { |
4618 | int ret = 0; | |
bec39940 | 4619 | struct lttng_ht_iter iter, uiter; |
700c5a9d | 4620 | struct lttng_ht_node_str *ua_chan_node; |
b0a40d28 DG |
4621 | struct ust_app *app; |
4622 | struct ust_app_session *ua_sess; | |
4623 | struct ust_app_channel *ua_chan; | |
4624 | struct ust_app_event *ua_event; | |
4625 | ||
88e3c2f5 | 4626 | assert(usess->active); |
b0a40d28 | 4627 | DBG("UST app disabling event %s for all apps in channel " |
d9bf3ca4 MD |
4628 | "%s for session id %" PRIu64, |
4629 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
4630 | |
4631 | rcu_read_lock(); | |
4632 | ||
4633 | /* For all registered applications */ | |
852d0037 | 4634 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4635 | if (!app->compatible) { |
4636 | /* | |
4637 | * TODO: In time, we should notice the caller of this error by | |
4638 | * telling him that this is a version error. | |
4639 | */ | |
4640 | continue; | |
4641 | } | |
b0a40d28 DG |
4642 | ua_sess = lookup_session_by_app(usess, app); |
4643 | if (ua_sess == NULL) { | |
4644 | /* Next app */ | |
4645 | continue; | |
4646 | } | |
4647 | ||
4648 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
4649 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4650 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 4651 | if (ua_chan_node == NULL) { |
d9bf3ca4 | 4652 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 4653 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
4654 | continue; |
4655 | } | |
4656 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4657 | ||
700c5a9d JR |
4658 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
4659 | uevent->filter, uevent->attr.loglevel, | |
4660 | uevent->exclusion); | |
4661 | if (ua_event == NULL) { | |
b0a40d28 | 4662 | DBG2("Event %s not found in channel %s for app pid %d." |
852d0037 | 4663 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
4664 | continue; |
4665 | } | |
b0a40d28 | 4666 | |
7f79d3a1 | 4667 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
4668 | if (ret < 0) { |
4669 | /* XXX: Report error someday... */ | |
4670 | continue; | |
4671 | } | |
4672 | } | |
4673 | ||
4674 | rcu_read_unlock(); | |
88e3c2f5 JG |
4675 | return ret; |
4676 | } | |
4677 | ||
4678 | /* The ua_sess lock must be held by the caller. */ | |
4679 | static | |
4680 | int ust_app_channel_create(struct ltt_ust_session *usess, | |
4681 | struct ust_app_session *ua_sess, | |
4682 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
4683 | struct ust_app_channel **_ua_chan) | |
4684 | { | |
4685 | int ret = 0; | |
4686 | struct ust_app_channel *ua_chan = NULL; | |
4687 | ||
4688 | assert(ua_sess); | |
4689 | ASSERT_LOCKED(ua_sess->lock); | |
4690 | ||
4691 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, | |
4692 | sizeof(uchan->name))) { | |
4693 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, | |
4694 | &uchan->attr); | |
4695 | ret = 0; | |
4696 | } else { | |
4697 | struct ltt_ust_context *uctx = NULL; | |
4698 | ||
4699 | /* | |
4700 | * Create channel onto application and synchronize its | |
4701 | * configuration. | |
4702 | */ | |
4703 | ret = ust_app_channel_allocate(ua_sess, uchan, | |
4704 | LTTNG_UST_CHAN_PER_CPU, usess, | |
4705 | &ua_chan); | |
88ebf5a7 JR |
4706 | if (ret < 0) { |
4707 | goto error; | |
4708 | } | |
4709 | ||
4710 | ret = ust_app_channel_send(app, usess, | |
4711 | ua_sess, ua_chan); | |
4712 | if (ret) { | |
4713 | goto error; | |
88e3c2f5 JG |
4714 | } |
4715 | ||
4716 | /* Add contexts. */ | |
4717 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { | |
4718 | ret = create_ust_app_channel_context(ua_chan, | |
4719 | &uctx->ctx, app); | |
4720 | if (ret) { | |
88ebf5a7 | 4721 | goto error; |
88e3c2f5 JG |
4722 | } |
4723 | } | |
4724 | } | |
88ebf5a7 JR |
4725 | |
4726 | error: | |
88e3c2f5 JG |
4727 | if (ret < 0) { |
4728 | switch (ret) { | |
4729 | case -ENOTCONN: | |
4730 | /* | |
4731 | * The application's socket is not valid. Either a bad socket | |
4732 | * or a timeout on it. We can't inform the caller that for a | |
4733 | * specific app, the session failed so lets continue here. | |
4734 | */ | |
4735 | ret = 0; /* Not an error. */ | |
4736 | break; | |
4737 | case -ENOMEM: | |
4738 | default: | |
4739 | break; | |
4740 | } | |
4741 | } | |
88ebf5a7 | 4742 | |
88e3c2f5 JG |
4743 | if (ret == 0 && _ua_chan) { |
4744 | /* | |
4745 | * Only return the application's channel on success. Note | |
4746 | * that the channel can still be part of the application's | |
4747 | * channel hashtable on error. | |
4748 | */ | |
4749 | *_ua_chan = ua_chan; | |
4750 | } | |
b0a40d28 DG |
4751 | return ret; |
4752 | } | |
4753 | ||
5b4a0ec0 | 4754 | /* |
edb67388 | 4755 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 4756 | */ |
35a9059d | 4757 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
4758 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4759 | { | |
4760 | int ret = 0; | |
bec39940 | 4761 | struct lttng_ht_iter iter, uiter; |
18eace3b | 4762 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
4763 | struct ust_app *app; |
4764 | struct ust_app_session *ua_sess; | |
4765 | struct ust_app_channel *ua_chan; | |
4766 | struct ust_app_event *ua_event; | |
48842b30 | 4767 | |
88e3c2f5 | 4768 | assert(usess->active); |
d9bf3ca4 | 4769 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 4770 | uevent->attr.name, usess->id); |
48842b30 | 4771 | |
edb67388 DG |
4772 | /* |
4773 | * NOTE: At this point, this function is called only if the session and | |
4774 | * channel passed are already created for all apps. and enabled on the | |
4775 | * tracer also. | |
4776 | */ | |
4777 | ||
48842b30 | 4778 | rcu_read_lock(); |
421cb601 DG |
4779 | |
4780 | /* For all registered applications */ | |
852d0037 | 4781 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4782 | if (!app->compatible) { |
4783 | /* | |
4784 | * TODO: In time, we should notice the caller of this error by | |
4785 | * telling him that this is a version error. | |
4786 | */ | |
4787 | continue; | |
4788 | } | |
edb67388 | 4789 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4790 | if (!ua_sess) { |
4791 | /* The application has problem or is probably dead. */ | |
4792 | continue; | |
4793 | } | |
ba767faf | 4794 | |
d0b96690 DG |
4795 | pthread_mutex_lock(&ua_sess->lock); |
4796 | ||
b161602a MD |
4797 | if (ua_sess->deleted) { |
4798 | pthread_mutex_unlock(&ua_sess->lock); | |
4799 | continue; | |
4800 | } | |
4801 | ||
edb67388 | 4802 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4803 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4804 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
a7169585 MD |
4805 | /* |
4806 | * It is possible that the channel cannot be found is | |
4807 | * the channel/event creation occurs concurrently with | |
4808 | * an application exit. | |
4809 | */ | |
4810 | if (!ua_chan_node) { | |
4811 | pthread_mutex_unlock(&ua_sess->lock); | |
4812 | continue; | |
4813 | } | |
edb67388 DG |
4814 | |
4815 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4816 | ||
18eace3b DG |
4817 | /* Get event node */ |
4818 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
39c5a3a7 | 4819 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 4820 | if (ua_event == NULL) { |
7f79d3a1 | 4821 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 4822 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 4823 | goto next_app; |
35a9059d | 4824 | } |
35a9059d DG |
4825 | |
4826 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
4827 | if (ret < 0) { | |
d0b96690 | 4828 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 4829 | goto error; |
48842b30 | 4830 | } |
d0b96690 DG |
4831 | next_app: |
4832 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
4833 | } |
4834 | ||
7f79d3a1 | 4835 | error: |
edb67388 | 4836 | rcu_read_unlock(); |
edb67388 DG |
4837 | return ret; |
4838 | } | |
4839 | ||
4840 | /* | |
4841 | * For a specific existing UST session and UST channel, creates the event for | |
4842 | * all registered apps. | |
4843 | */ | |
35a9059d | 4844 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
4845 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4846 | { | |
4847 | int ret = 0; | |
bec39940 DG |
4848 | struct lttng_ht_iter iter, uiter; |
4849 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
4850 | struct ust_app *app; |
4851 | struct ust_app_session *ua_sess; | |
4852 | struct ust_app_channel *ua_chan; | |
4853 | ||
88e3c2f5 | 4854 | assert(usess->active); |
d9bf3ca4 | 4855 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 4856 | uevent->attr.name, usess->id); |
edb67388 | 4857 | |
edb67388 DG |
4858 | rcu_read_lock(); |
4859 | ||
4860 | /* For all registered applications */ | |
852d0037 | 4861 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4862 | if (!app->compatible) { |
4863 | /* | |
4864 | * TODO: In time, we should notice the caller of this error by | |
4865 | * telling him that this is a version error. | |
4866 | */ | |
4867 | continue; | |
4868 | } | |
edb67388 | 4869 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4870 | if (!ua_sess) { |
4871 | /* The application has problem or is probably dead. */ | |
4872 | continue; | |
4873 | } | |
48842b30 | 4874 | |
d0b96690 | 4875 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
4876 | |
4877 | if (ua_sess->deleted) { | |
4878 | pthread_mutex_unlock(&ua_sess->lock); | |
4879 | continue; | |
4880 | } | |
4881 | ||
48842b30 | 4882 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4883 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4884 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
4885 | /* If the channel is not found, there is a code flow error */ |
4886 | assert(ua_chan_node); | |
4887 | ||
48842b30 DG |
4888 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
4889 | ||
edb67388 | 4890 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 4891 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 4892 | if (ret < 0) { |
49c336c1 | 4893 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
4894 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
4895 | break; | |
4896 | } | |
4897 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 4898 | uevent->attr.name, app->pid); |
5b4a0ec0 | 4899 | continue; |
48842b30 | 4900 | } |
48842b30 | 4901 | } |
5b4a0ec0 | 4902 | |
48842b30 | 4903 | rcu_read_unlock(); |
48842b30 DG |
4904 | return ret; |
4905 | } | |
4906 | ||
5b4a0ec0 DG |
4907 | /* |
4908 | * Start tracing for a specific UST session and app. | |
fad1ed2f JR |
4909 | * |
4910 | * Called with UST app session lock held. | |
4911 | * | |
5b4a0ec0 | 4912 | */ |
b34cbebf | 4913 | static |
421cb601 | 4914 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
4915 | { |
4916 | int ret = 0; | |
48842b30 | 4917 | struct ust_app_session *ua_sess; |
48842b30 | 4918 | |
852d0037 | 4919 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 4920 | |
509cbaf8 MD |
4921 | rcu_read_lock(); |
4922 | ||
e0c7ec2b DG |
4923 | if (!app->compatible) { |
4924 | goto end; | |
4925 | } | |
4926 | ||
421cb601 DG |
4927 | ua_sess = lookup_session_by_app(usess, app); |
4928 | if (ua_sess == NULL) { | |
d42f20df DG |
4929 | /* The session is in teardown process. Ignore and continue. */ |
4930 | goto end; | |
421cb601 | 4931 | } |
48842b30 | 4932 | |
d0b96690 DG |
4933 | pthread_mutex_lock(&ua_sess->lock); |
4934 | ||
b161602a MD |
4935 | if (ua_sess->deleted) { |
4936 | pthread_mutex_unlock(&ua_sess->lock); | |
4937 | goto end; | |
4938 | } | |
4939 | ||
b0a1c741 JR |
4940 | if (ua_sess->enabled) { |
4941 | pthread_mutex_unlock(&ua_sess->lock); | |
4942 | goto end; | |
4943 | } | |
4944 | ||
aea829b3 DG |
4945 | /* Upon restart, we skip the setup, already done */ |
4946 | if (ua_sess->started) { | |
8be98f9a | 4947 | goto skip_setup; |
aea829b3 | 4948 | } |
8be98f9a | 4949 | |
840cb59c | 4950 | health_code_update(); |
86acf0da | 4951 | |
8be98f9a | 4952 | skip_setup: |
a945cdc7 | 4953 | /* This starts the UST tracing */ |
fb45065e | 4954 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4955 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
fb45065e | 4956 | pthread_mutex_unlock(&app->sock_lock); |
421cb601 | 4957 | if (ret < 0) { |
ffe60014 DG |
4958 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4959 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
4960 | app->pid, ret); | |
4961 | } else { | |
4962 | DBG("UST app start session failed. Application is dead."); | |
3757b385 DG |
4963 | /* |
4964 | * This is normal behavior, an application can die during the | |
4965 | * creation process. Don't report an error so the execution can | |
4966 | * continue normally. | |
4967 | */ | |
4968 | pthread_mutex_unlock(&ua_sess->lock); | |
4969 | goto end; | |
ffe60014 | 4970 | } |
d0b96690 | 4971 | goto error_unlock; |
421cb601 | 4972 | } |
5b4a0ec0 | 4973 | |
55c3953d DG |
4974 | /* Indicate that the session has been started once */ |
4975 | ua_sess->started = 1; | |
b0a1c741 | 4976 | ua_sess->enabled = 1; |
55c3953d | 4977 | |
d0b96690 DG |
4978 | pthread_mutex_unlock(&ua_sess->lock); |
4979 | ||
840cb59c | 4980 | health_code_update(); |
86acf0da | 4981 | |
421cb601 | 4982 | /* Quiescent wait after starting trace */ |
fb45065e | 4983 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4984 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4985 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4986 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4987 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4988 | app->pid, ret); | |
4989 | } | |
48842b30 | 4990 | |
e0c7ec2b DG |
4991 | end: |
4992 | rcu_read_unlock(); | |
840cb59c | 4993 | health_code_update(); |
421cb601 | 4994 | return 0; |
48842b30 | 4995 | |
d0b96690 DG |
4996 | error_unlock: |
4997 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 4998 | rcu_read_unlock(); |
840cb59c | 4999 | health_code_update(); |
421cb601 DG |
5000 | return -1; |
5001 | } | |
48842b30 | 5002 | |
8be98f9a MD |
5003 | /* |
5004 | * Stop tracing for a specific UST session and app. | |
5005 | */ | |
b34cbebf | 5006 | static |
8be98f9a MD |
5007 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
5008 | { | |
5009 | int ret = 0; | |
5010 | struct ust_app_session *ua_sess; | |
7972aab2 | 5011 | struct ust_registry_session *registry; |
8be98f9a | 5012 | |
852d0037 | 5013 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
5014 | |
5015 | rcu_read_lock(); | |
5016 | ||
e0c7ec2b | 5017 | if (!app->compatible) { |
d88aee68 | 5018 | goto end_no_session; |
e0c7ec2b DG |
5019 | } |
5020 | ||
8be98f9a MD |
5021 | ua_sess = lookup_session_by_app(usess, app); |
5022 | if (ua_sess == NULL) { | |
d88aee68 | 5023 | goto end_no_session; |
8be98f9a MD |
5024 | } |
5025 | ||
d88aee68 DG |
5026 | pthread_mutex_lock(&ua_sess->lock); |
5027 | ||
b161602a MD |
5028 | if (ua_sess->deleted) { |
5029 | pthread_mutex_unlock(&ua_sess->lock); | |
5030 | goto end_no_session; | |
5031 | } | |
5032 | ||
9bc07046 DG |
5033 | /* |
5034 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
5035 | * that was never started. It's possible since we can have a fail start |
5036 | * from either the application manager thread or the command thread. Simply | |
5037 | * indicate that this is a stop error. | |
9bc07046 | 5038 | */ |
f9dfc3d9 | 5039 | if (!ua_sess->started) { |
c45536e1 DG |
5040 | goto error_rcu_unlock; |
5041 | } | |
7db205b5 | 5042 | |
840cb59c | 5043 | health_code_update(); |
86acf0da | 5044 | |
9d6c7d3f | 5045 | /* This inhibits UST tracing */ |
fb45065e | 5046 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 5047 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
fb45065e | 5048 | pthread_mutex_unlock(&app->sock_lock); |
9d6c7d3f | 5049 | if (ret < 0) { |
ffe60014 DG |
5050 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
5051 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
5052 | app->pid, ret); | |
5053 | } else { | |
5054 | DBG("UST app stop session failed. Application is dead."); | |
3757b385 DG |
5055 | /* |
5056 | * This is normal behavior, an application can die during the | |
5057 | * creation process. Don't report an error so the execution can | |
5058 | * continue normally. | |
5059 | */ | |
5060 | goto end_unlock; | |
ffe60014 | 5061 | } |
9d6c7d3f DG |
5062 | goto error_rcu_unlock; |
5063 | } | |
5064 | ||
840cb59c | 5065 | health_code_update(); |
b0a1c741 | 5066 | ua_sess->enabled = 0; |
86acf0da | 5067 | |
9d6c7d3f | 5068 | /* Quiescent wait after stopping trace */ |
fb45065e | 5069 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 5070 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 5071 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
5072 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
5073 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
5074 | app->pid, ret); | |
5075 | } | |
9d6c7d3f | 5076 | |
840cb59c | 5077 | health_code_update(); |
86acf0da | 5078 | |
b34cbebf | 5079 | registry = get_session_registry(ua_sess); |
fad1ed2f JR |
5080 | |
5081 | /* The UST app session is held registry shall not be null. */ | |
b34cbebf | 5082 | assert(registry); |
1b532a60 | 5083 | |
ce34fcd0 MD |
5084 | /* Push metadata for application before freeing the application. */ |
5085 | (void) push_metadata(registry, ua_sess->consumer); | |
b34cbebf | 5086 | |
3757b385 | 5087 | end_unlock: |
b34cbebf MD |
5088 | pthread_mutex_unlock(&ua_sess->lock); |
5089 | end_no_session: | |
5090 | rcu_read_unlock(); | |
5091 | health_code_update(); | |
5092 | return 0; | |
5093 | ||
5094 | error_rcu_unlock: | |
5095 | pthread_mutex_unlock(&ua_sess->lock); | |
5096 | rcu_read_unlock(); | |
5097 | health_code_update(); | |
5098 | return -1; | |
5099 | } | |
5100 | ||
b34cbebf | 5101 | static |
c4b88406 MD |
5102 | int ust_app_flush_app_session(struct ust_app *app, |
5103 | struct ust_app_session *ua_sess) | |
b34cbebf | 5104 | { |
c4b88406 | 5105 | int ret, retval = 0; |
b34cbebf | 5106 | struct lttng_ht_iter iter; |
b34cbebf | 5107 | struct ust_app_channel *ua_chan; |
c4b88406 | 5108 | struct consumer_socket *socket; |
b34cbebf | 5109 | |
c4b88406 | 5110 | DBG("Flushing app session buffers for ust app pid %d", app->pid); |
b34cbebf MD |
5111 | |
5112 | rcu_read_lock(); | |
5113 | ||
5114 | if (!app->compatible) { | |
c4b88406 | 5115 | goto end_not_compatible; |
b34cbebf MD |
5116 | } |
5117 | ||
5118 | pthread_mutex_lock(&ua_sess->lock); | |
5119 | ||
b161602a MD |
5120 | if (ua_sess->deleted) { |
5121 | goto end_deleted; | |
5122 | } | |
5123 | ||
b34cbebf MD |
5124 | health_code_update(); |
5125 | ||
9d6c7d3f | 5126 | /* Flushing buffers */ |
c4b88406 MD |
5127 | socket = consumer_find_socket_by_bitness(app->bits_per_long, |
5128 | ua_sess->consumer); | |
ce34fcd0 MD |
5129 | |
5130 | /* Flush buffers and push metadata. */ | |
5131 | switch (ua_sess->buffer_type) { | |
5132 | case LTTNG_BUFFER_PER_PID: | |
5133 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, | |
5134 | node.node) { | |
5135 | health_code_update(); | |
ce34fcd0 MD |
5136 | ret = consumer_flush_channel(socket, ua_chan->key); |
5137 | if (ret) { | |
5138 | ERR("Error flushing consumer channel"); | |
5139 | retval = -1; | |
5140 | continue; | |
5141 | } | |
8be98f9a | 5142 | } |
ce34fcd0 MD |
5143 | break; |
5144 | case LTTNG_BUFFER_PER_UID: | |
5145 | default: | |
5146 | assert(0); | |
5147 | break; | |
8be98f9a | 5148 | } |
8be98f9a | 5149 | |
840cb59c | 5150 | health_code_update(); |
86acf0da | 5151 | |
b161602a | 5152 | end_deleted: |
d88aee68 | 5153 | pthread_mutex_unlock(&ua_sess->lock); |
ce34fcd0 | 5154 | |
c4b88406 MD |
5155 | end_not_compatible: |
5156 | rcu_read_unlock(); | |
5157 | health_code_update(); | |
5158 | return retval; | |
5159 | } | |
5160 | ||
5161 | /* | |
ce34fcd0 MD |
5162 | * Flush buffers for all applications for a specific UST session. |
5163 | * Called with UST session lock held. | |
c4b88406 MD |
5164 | */ |
5165 | static | |
ce34fcd0 | 5166 | int ust_app_flush_session(struct ltt_ust_session *usess) |
c4b88406 MD |
5167 | |
5168 | { | |
99b1411c | 5169 | int ret = 0; |
c4b88406 | 5170 | |
ce34fcd0 | 5171 | DBG("Flushing session buffers for all ust apps"); |
c4b88406 MD |
5172 | |
5173 | rcu_read_lock(); | |
5174 | ||
ce34fcd0 MD |
5175 | /* Flush buffers and push metadata. */ |
5176 | switch (usess->buffer_type) { | |
5177 | case LTTNG_BUFFER_PER_UID: | |
5178 | { | |
5179 | struct buffer_reg_uid *reg; | |
5180 | struct lttng_ht_iter iter; | |
5181 | ||
5182 | /* Flush all per UID buffers associated to that session. */ | |
5183 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
5184 | struct ust_registry_session *ust_session_reg; | |
5185 | struct buffer_reg_channel *reg_chan; | |
5186 | struct consumer_socket *socket; | |
5187 | ||
5188 | /* Get consumer socket to use to push the metadata.*/ | |
5189 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
5190 | usess->consumer); | |
5191 | if (!socket) { | |
5192 | /* Ignore request if no consumer is found for the session. */ | |
5193 | continue; | |
5194 | } | |
5195 | ||
5196 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
5197 | reg_chan, node.node) { | |
5198 | /* | |
5199 | * The following call will print error values so the return | |
5200 | * code is of little importance because whatever happens, we | |
5201 | * have to try them all. | |
5202 | */ | |
5203 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
5204 | } | |
5205 | ||
5206 | ust_session_reg = reg->registry->reg.ust; | |
5207 | /* Push metadata. */ | |
5208 | (void) push_metadata(ust_session_reg, usess->consumer); | |
5209 | } | |
ce34fcd0 MD |
5210 | break; |
5211 | } | |
5212 | case LTTNG_BUFFER_PER_PID: | |
5213 | { | |
5214 | struct ust_app_session *ua_sess; | |
5215 | struct lttng_ht_iter iter; | |
5216 | struct ust_app *app; | |
5217 | ||
5218 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5219 | ua_sess = lookup_session_by_app(usess, app); | |
5220 | if (ua_sess == NULL) { | |
5221 | continue; | |
5222 | } | |
5223 | (void) ust_app_flush_app_session(app, ua_sess); | |
5224 | } | |
5225 | break; | |
5226 | } | |
5227 | default: | |
99b1411c | 5228 | ret = -1; |
ce34fcd0 MD |
5229 | assert(0); |
5230 | break; | |
c4b88406 | 5231 | } |
c4b88406 | 5232 | |
7db205b5 | 5233 | rcu_read_unlock(); |
840cb59c | 5234 | health_code_update(); |
c4b88406 | 5235 | return ret; |
8be98f9a MD |
5236 | } |
5237 | ||
0dd01979 MD |
5238 | static |
5239 | int ust_app_clear_quiescent_app_session(struct ust_app *app, | |
5240 | struct ust_app_session *ua_sess) | |
5241 | { | |
5242 | int ret = 0; | |
5243 | struct lttng_ht_iter iter; | |
5244 | struct ust_app_channel *ua_chan; | |
5245 | struct consumer_socket *socket; | |
5246 | ||
5247 | DBG("Clearing stream quiescent state for ust app pid %d", app->pid); | |
5248 | ||
5249 | rcu_read_lock(); | |
5250 | ||
5251 | if (!app->compatible) { | |
5252 | goto end_not_compatible; | |
5253 | } | |
5254 | ||
5255 | pthread_mutex_lock(&ua_sess->lock); | |
5256 | ||
5257 | if (ua_sess->deleted) { | |
5258 | goto end_unlock; | |
5259 | } | |
5260 | ||
5261 | health_code_update(); | |
5262 | ||
5263 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
5264 | ua_sess->consumer); | |
5265 | if (!socket) { | |
5266 | ERR("Failed to find consumer (%" PRIu32 ") socket", | |
5267 | app->bits_per_long); | |
5268 | ret = -1; | |
5269 | goto end_unlock; | |
5270 | } | |
5271 | ||
5272 | /* Clear quiescent state. */ | |
5273 | switch (ua_sess->buffer_type) { | |
5274 | case LTTNG_BUFFER_PER_PID: | |
5275 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, | |
5276 | ua_chan, node.node) { | |
5277 | health_code_update(); | |
5278 | ret = consumer_clear_quiescent_channel(socket, | |
5279 | ua_chan->key); | |
5280 | if (ret) { | |
5281 | ERR("Error clearing quiescent state for consumer channel"); | |
5282 | ret = -1; | |
5283 | continue; | |
5284 | } | |
5285 | } | |
5286 | break; | |
5287 | case LTTNG_BUFFER_PER_UID: | |
5288 | default: | |
5289 | assert(0); | |
5290 | ret = -1; | |
5291 | break; | |
5292 | } | |
5293 | ||
5294 | health_code_update(); | |
5295 | ||
5296 | end_unlock: | |
5297 | pthread_mutex_unlock(&ua_sess->lock); | |
5298 | ||
5299 | end_not_compatible: | |
5300 | rcu_read_unlock(); | |
5301 | health_code_update(); | |
5302 | return ret; | |
5303 | } | |
5304 | ||
5305 | /* | |
5306 | * Clear quiescent state in each stream for all applications for a | |
5307 | * specific UST session. | |
5308 | * Called with UST session lock held. | |
5309 | */ | |
5310 | static | |
5311 | int ust_app_clear_quiescent_session(struct ltt_ust_session *usess) | |
5312 | ||
5313 | { | |
5314 | int ret = 0; | |
5315 | ||
5316 | DBG("Clearing stream quiescent state for all ust apps"); | |
5317 | ||
5318 | rcu_read_lock(); | |
5319 | ||
5320 | switch (usess->buffer_type) { | |
5321 | case LTTNG_BUFFER_PER_UID: | |
5322 | { | |
5323 | struct lttng_ht_iter iter; | |
5324 | struct buffer_reg_uid *reg; | |
5325 | ||
5326 | /* | |
5327 | * Clear quiescent for all per UID buffers associated to | |
5328 | * that session. | |
5329 | */ | |
5330 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
5331 | struct consumer_socket *socket; | |
5332 | struct buffer_reg_channel *reg_chan; | |
5333 | ||
5334 | /* Get associated consumer socket.*/ | |
5335 | socket = consumer_find_socket_by_bitness( | |
5336 | reg->bits_per_long, usess->consumer); | |
5337 | if (!socket) { | |
5338 | /* | |
5339 | * Ignore request if no consumer is found for | |
5340 | * the session. | |
5341 | */ | |
5342 | continue; | |
5343 | } | |
5344 | ||
5345 | cds_lfht_for_each_entry(reg->registry->channels->ht, | |
5346 | &iter.iter, reg_chan, node.node) { | |
5347 | /* | |
5348 | * The following call will print error values so | |
5349 | * the return code is of little importance | |
5350 | * because whatever happens, we have to try them | |
5351 | * all. | |
5352 | */ | |
5353 | (void) consumer_clear_quiescent_channel(socket, | |
5354 | reg_chan->consumer_key); | |
5355 | } | |
5356 | } | |
5357 | break; | |
5358 | } | |
5359 | case LTTNG_BUFFER_PER_PID: | |
5360 | { | |
5361 | struct ust_app_session *ua_sess; | |
5362 | struct lttng_ht_iter iter; | |
5363 | struct ust_app *app; | |
5364 | ||
5365 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, | |
5366 | pid_n.node) { | |
5367 | ua_sess = lookup_session_by_app(usess, app); | |
5368 | if (ua_sess == NULL) { | |
5369 | continue; | |
5370 | } | |
5371 | (void) ust_app_clear_quiescent_app_session(app, | |
5372 | ua_sess); | |
5373 | } | |
5374 | break; | |
5375 | } | |
5376 | default: | |
5377 | ret = -1; | |
5378 | assert(0); | |
5379 | break; | |
5380 | } | |
5381 | ||
5382 | rcu_read_unlock(); | |
5383 | health_code_update(); | |
5384 | return ret; | |
5385 | } | |
5386 | ||
84cd17c6 MD |
5387 | /* |
5388 | * Destroy a specific UST session in apps. | |
5389 | */ | |
3353de95 | 5390 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 5391 | { |
ffe60014 | 5392 | int ret; |
84cd17c6 | 5393 | struct ust_app_session *ua_sess; |
bec39940 | 5394 | struct lttng_ht_iter iter; |
d9bf3ca4 | 5395 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 5396 | |
852d0037 | 5397 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
5398 | |
5399 | rcu_read_lock(); | |
5400 | ||
e0c7ec2b DG |
5401 | if (!app->compatible) { |
5402 | goto end; | |
5403 | } | |
5404 | ||
84cd17c6 | 5405 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 5406 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 5407 | if (node == NULL) { |
d42f20df DG |
5408 | /* Session is being or is deleted. */ |
5409 | goto end; | |
84cd17c6 MD |
5410 | } |
5411 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 5412 | |
840cb59c | 5413 | health_code_update(); |
d0b96690 | 5414 | destroy_app_session(app, ua_sess); |
84cd17c6 | 5415 | |
840cb59c | 5416 | health_code_update(); |
7db205b5 | 5417 | |
84cd17c6 | 5418 | /* Quiescent wait after stopping trace */ |
fb45065e | 5419 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 5420 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 5421 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
5422 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
5423 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
5424 | app->pid, ret); | |
5425 | } | |
e0c7ec2b DG |
5426 | end: |
5427 | rcu_read_unlock(); | |
840cb59c | 5428 | health_code_update(); |
84cd17c6 | 5429 | return 0; |
84cd17c6 MD |
5430 | } |
5431 | ||
5b4a0ec0 DG |
5432 | /* |
5433 | * Start tracing for the UST session. | |
5434 | */ | |
421cb601 DG |
5435 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
5436 | { | |
bec39940 | 5437 | struct lttng_ht_iter iter; |
421cb601 | 5438 | struct ust_app *app; |
48842b30 | 5439 | |
421cb601 DG |
5440 | DBG("Starting all UST traces"); |
5441 | ||
bb2452c8 MD |
5442 | /* |
5443 | * Even though the start trace might fail, flag this session active so | |
5444 | * other application coming in are started by default. | |
5445 | */ | |
5446 | usess->active = 1; | |
5447 | ||
421cb601 | 5448 | rcu_read_lock(); |
421cb601 | 5449 | |
0dd01979 MD |
5450 | /* |
5451 | * In a start-stop-start use-case, we need to clear the quiescent state | |
5452 | * of each channel set by the prior stop command, thus ensuring that a | |
5453 | * following stop or destroy is sure to grab a timestamp_end near those | |
5454 | * operations, even if the packet is empty. | |
5455 | */ | |
5456 | (void) ust_app_clear_quiescent_session(usess); | |
5457 | ||
0498a00c MD |
5458 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
5459 | ust_app_global_update(usess, app); | |
5460 | } | |
5461 | ||
48842b30 DG |
5462 | rcu_read_unlock(); |
5463 | ||
5464 | return 0; | |
5465 | } | |
487cf67c | 5466 | |
8be98f9a MD |
5467 | /* |
5468 | * Start tracing for the UST session. | |
ce34fcd0 | 5469 | * Called with UST session lock held. |
8be98f9a MD |
5470 | */ |
5471 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
5472 | { | |
5473 | int ret = 0; | |
bec39940 | 5474 | struct lttng_ht_iter iter; |
8be98f9a MD |
5475 | struct ust_app *app; |
5476 | ||
5477 | DBG("Stopping all UST traces"); | |
5478 | ||
bb2452c8 MD |
5479 | /* |
5480 | * Even though the stop trace might fail, flag this session inactive so | |
5481 | * other application coming in are not started by default. | |
5482 | */ | |
5483 | usess->active = 0; | |
5484 | ||
8be98f9a MD |
5485 | rcu_read_lock(); |
5486 | ||
b34cbebf MD |
5487 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
5488 | ret = ust_app_stop_trace(usess, app); | |
5489 | if (ret < 0) { | |
5490 | /* Continue to next apps even on error */ | |
5491 | continue; | |
5492 | } | |
5493 | } | |
5494 | ||
ce34fcd0 | 5495 | (void) ust_app_flush_session(usess); |
8be98f9a MD |
5496 | |
5497 | rcu_read_unlock(); | |
5498 | ||
5499 | return 0; | |
5500 | } | |
5501 | ||
84cd17c6 MD |
5502 | /* |
5503 | * Destroy app UST session. | |
5504 | */ | |
5505 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
5506 | { | |
5507 | int ret = 0; | |
bec39940 | 5508 | struct lttng_ht_iter iter; |
84cd17c6 MD |
5509 | struct ust_app *app; |
5510 | ||
5511 | DBG("Destroy all UST traces"); | |
5512 | ||
5513 | rcu_read_lock(); | |
5514 | ||
852d0037 | 5515 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 5516 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
5517 | if (ret < 0) { |
5518 | /* Continue to next apps even on error */ | |
5519 | continue; | |
5520 | } | |
5521 | } | |
5522 | ||
5523 | rcu_read_unlock(); | |
5524 | ||
5525 | return 0; | |
5526 | } | |
5527 | ||
88e3c2f5 | 5528 | /* The ua_sess lock must be held by the caller. */ |
a9ad0c8f | 5529 | static |
88e3c2f5 JG |
5530 | int find_or_create_ust_app_channel( |
5531 | struct ltt_ust_session *usess, | |
5532 | struct ust_app_session *ua_sess, | |
5533 | struct ust_app *app, | |
5534 | struct ltt_ust_channel *uchan, | |
5535 | struct ust_app_channel **ua_chan) | |
487cf67c | 5536 | { |
55c54cce | 5537 | int ret = 0; |
88e3c2f5 JG |
5538 | struct lttng_ht_iter iter; |
5539 | struct lttng_ht_node_str *ua_chan_node; | |
5540 | ||
5541 | lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &iter); | |
5542 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
5543 | if (ua_chan_node) { | |
5544 | *ua_chan = caa_container_of(ua_chan_node, | |
5545 | struct ust_app_channel, node); | |
5546 | goto end; | |
5547 | } | |
5548 | ||
5549 | ret = ust_app_channel_create(usess, ua_sess, uchan, app, ua_chan); | |
5550 | if (ret) { | |
5551 | goto end; | |
5552 | } | |
5553 | end: | |
5554 | return ret; | |
5555 | } | |
5556 | ||
5557 | static | |
5558 | int ust_app_channel_synchronize_event(struct ust_app_channel *ua_chan, | |
5559 | struct ltt_ust_event *uevent, struct ust_app_session *ua_sess, | |
5560 | struct ust_app *app) | |
5561 | { | |
5562 | int ret = 0; | |
5563 | struct ust_app_event *ua_event = NULL; | |
5564 | ||
5565 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
5566 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); | |
5567 | if (!ua_event) { | |
5568 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); | |
5569 | if (ret < 0) { | |
5570 | goto end; | |
5571 | } | |
5572 | } else { | |
5573 | if (ua_event->enabled != uevent->enabled) { | |
5574 | ret = uevent->enabled ? | |
5575 | enable_ust_app_event(ua_sess, ua_event, app) : | |
5576 | disable_ust_app_event(ua_sess, ua_event, app); | |
5577 | } | |
5578 | } | |
5579 | ||
5580 | end: | |
5581 | return ret; | |
5582 | } | |
5583 | ||
993578ff JR |
5584 | /* Called with RCU read-side lock held. */ |
5585 | static | |
5586 | void ust_app_synchronize_event_notifier_rules(struct ust_app *app) | |
5587 | { | |
5588 | int ret = 0; | |
5589 | enum lttng_error_code ret_code; | |
5590 | enum lttng_trigger_status t_status; | |
5591 | struct lttng_ht_iter app_trigger_iter; | |
5592 | struct lttng_triggers *triggers = NULL; | |
5593 | struct ust_app_event_notifier_rule *event_notifier_rule; | |
5594 | unsigned int count, i; | |
5595 | ||
5596 | /* | |
5597 | * Currrently, registering or unregistering a trigger with an | |
5598 | * event rule condition causes a full synchronization of the event | |
5599 | * notifiers. | |
5600 | * | |
5601 | * The first step attempts to add an event notifier for all registered | |
5602 | * triggers that apply to the user space tracers. Then, the | |
5603 | * application's event notifiers rules are all checked against the list | |
5604 | * of registered triggers. Any event notifier that doesn't have a | |
5605 | * matching trigger can be assumed to have been disabled. | |
5606 | * | |
5607 | * All of this is inefficient, but is put in place to get the feature | |
5608 | * rolling as it is simpler at this moment. It will be optimized Soon™ | |
5609 | * to allow the state of enabled | |
5610 | * event notifiers to be synchronized in a piece-wise way. | |
5611 | */ | |
5612 | ||
5613 | /* Get all triggers using uid 0 (root) */ | |
5614 | ret_code = notification_thread_command_list_triggers( | |
5615 | notification_thread_handle, 0, &triggers); | |
5616 | if (ret_code != LTTNG_OK) { | |
5617 | ret = -1; | |
5618 | goto end; | |
5619 | } | |
5620 | ||
5621 | assert(triggers); | |
5622 | ||
5623 | t_status = lttng_triggers_get_count(triggers, &count); | |
5624 | if (t_status != LTTNG_TRIGGER_STATUS_OK) { | |
5625 | ret = -1; | |
5626 | goto end; | |
5627 | } | |
5628 | ||
5629 | for (i = 0; i < count; i++) { | |
5630 | struct lttng_condition *condition; | |
5631 | struct lttng_event_rule *event_rule; | |
5632 | struct lttng_trigger *trigger; | |
5633 | const struct ust_app_event_notifier_rule *looked_up_event_notifier_rule; | |
5634 | enum lttng_condition_status condition_status; | |
5635 | uint64_t token; | |
5636 | ||
5637 | trigger = lttng_triggers_borrow_mutable_at_index(triggers, i); | |
5638 | assert(trigger); | |
5639 | ||
5640 | token = lttng_trigger_get_tracer_token(trigger); | |
5641 | condition = lttng_trigger_get_condition(trigger); | |
5642 | ||
5643 | if (lttng_condition_get_type(condition) != LTTNG_CONDITION_TYPE_EVENT_RULE_HIT) { | |
5644 | /* Does not apply */ | |
5645 | continue; | |
5646 | } | |
5647 | ||
5648 | condition_status = lttng_condition_event_rule_borrow_rule_mutable(condition, &event_rule); | |
5649 | assert(condition_status == LTTNG_CONDITION_STATUS_OK); | |
5650 | ||
5651 | if (lttng_event_rule_get_domain_type(event_rule) == LTTNG_DOMAIN_KERNEL) { | |
5652 | /* Skip kernel related triggers. */ | |
5653 | continue; | |
5654 | } | |
5655 | ||
5656 | /* | |
5657 | * Find or create the associated token event rule. The caller | |
5658 | * holds the RCU read lock, so this is safe to call without | |
5659 | * explicitly acquiring it here. | |
5660 | */ | |
5661 | looked_up_event_notifier_rule = find_ust_app_event_notifier_rule( | |
5662 | app->token_to_event_notifier_rule_ht, token); | |
5663 | if (!looked_up_event_notifier_rule) { | |
267d66aa | 5664 | ret = create_ust_app_event_notifier_rule(trigger, app); |
993578ff JR |
5665 | if (ret < 0) { |
5666 | goto end; | |
5667 | } | |
5668 | } | |
5669 | } | |
5670 | ||
5671 | rcu_read_lock(); | |
5672 | /* Remove all unknown event sources from the app. */ | |
5673 | cds_lfht_for_each_entry (app->token_to_event_notifier_rule_ht->ht, | |
5674 | &app_trigger_iter.iter, event_notifier_rule, | |
5675 | node.node) { | |
5676 | const uint64_t app_token = event_notifier_rule->token; | |
5677 | bool found = false; | |
5678 | ||
5679 | /* | |
5680 | * Check if the app event trigger still exists on the | |
5681 | * notification side. | |
5682 | */ | |
5683 | for (i = 0; i < count; i++) { | |
5684 | uint64_t notification_thread_token; | |
5685 | const struct lttng_trigger *trigger = | |
5686 | lttng_triggers_get_at_index( | |
5687 | triggers, i); | |
5688 | ||
5689 | assert(trigger); | |
5690 | ||
5691 | notification_thread_token = | |
5692 | lttng_trigger_get_tracer_token(trigger); | |
5693 | ||
5694 | if (notification_thread_token == app_token) { | |
5695 | found = true; | |
5696 | break; | |
5697 | } | |
5698 | } | |
5699 | ||
5700 | if (found) { | |
5701 | /* Still valid. */ | |
5702 | continue; | |
5703 | } | |
5704 | ||
5705 | /* | |
5706 | * This trigger was unregistered, disable it on the tracer's | |
5707 | * side. | |
5708 | */ | |
5709 | ret = lttng_ht_del(app->token_to_event_notifier_rule_ht, | |
5710 | &app_trigger_iter); | |
5711 | assert(ret == 0); | |
5712 | ||
5713 | /* Callee logs errors. */ | |
5714 | (void) disable_ust_object(app, event_notifier_rule->obj); | |
5715 | ||
5716 | delete_ust_app_event_notifier_rule( | |
5717 | app->sock, event_notifier_rule, app); | |
5718 | } | |
5719 | ||
5720 | rcu_read_unlock(); | |
5721 | ||
5722 | end: | |
5723 | lttng_triggers_destroy(triggers); | |
5724 | return; | |
5725 | } | |
5726 | ||
88e3c2f5 JG |
5727 | /* |
5728 | * The caller must ensure that the application is compatible and is tracked | |
2a3a1a2b | 5729 | * by the process attribute trackers. |
88e3c2f5 JG |
5730 | */ |
5731 | static | |
5732 | void ust_app_synchronize(struct ltt_ust_session *usess, | |
5733 | struct ust_app *app) | |
5734 | { | |
5735 | int ret = 0; | |
5736 | struct cds_lfht_iter uchan_iter; | |
5737 | struct ltt_ust_channel *uchan; | |
3d8ca23b | 5738 | struct ust_app_session *ua_sess = NULL; |
1f3580c7 | 5739 | |
88e3c2f5 JG |
5740 | /* |
5741 | * The application's configuration should only be synchronized for | |
5742 | * active sessions. | |
5743 | */ | |
5744 | assert(usess->active); | |
5745 | ||
5746 | ret = find_or_create_ust_app_session(usess, app, &ua_sess, NULL); | |
3d8ca23b DG |
5747 | if (ret < 0) { |
5748 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
5749 | goto error; |
5750 | } | |
3d8ca23b | 5751 | assert(ua_sess); |
487cf67c | 5752 | |
d0b96690 | 5753 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
5754 | if (ua_sess->deleted) { |
5755 | pthread_mutex_unlock(&ua_sess->lock); | |
5756 | goto end; | |
5757 | } | |
5758 | ||
88e3c2f5 | 5759 | rcu_read_lock(); |
ef67c072 | 5760 | |
88e3c2f5 JG |
5761 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &uchan_iter, |
5762 | uchan, node.node) { | |
5763 | struct ust_app_channel *ua_chan; | |
5764 | struct cds_lfht_iter uevent_iter; | |
5765 | struct ltt_ust_event *uevent; | |
487cf67c | 5766 | |
31746f93 | 5767 | /* |
88e3c2f5 JG |
5768 | * Search for a matching ust_app_channel. If none is found, |
5769 | * create it. Creating the channel will cause the ua_chan | |
5770 | * structure to be allocated, the channel buffers to be | |
5771 | * allocated (if necessary) and sent to the application, and | |
5772 | * all enabled contexts will be added to the channel. | |
31746f93 | 5773 | */ |
f3db82be | 5774 | ret = find_or_create_ust_app_channel(usess, ua_sess, |
88e3c2f5 JG |
5775 | app, uchan, &ua_chan); |
5776 | if (ret) { | |
5777 | /* Tracer is probably gone or ENOMEM. */ | |
5778 | goto error_unlock; | |
727d5404 DG |
5779 | } |
5780 | ||
88e3c2f5 JG |
5781 | if (!ua_chan) { |
5782 | /* ua_chan will be NULL for the metadata channel */ | |
5783 | continue; | |
5784 | } | |
727d5404 | 5785 | |
88e3c2f5 | 5786 | cds_lfht_for_each_entry(uchan->events->ht, &uevent_iter, uevent, |
bec39940 | 5787 | node.node) { |
88e3c2f5 JG |
5788 | ret = ust_app_channel_synchronize_event(ua_chan, |
5789 | uevent, ua_sess, app); | |
5790 | if (ret) { | |
d0b96690 | 5791 | goto error_unlock; |
487cf67c | 5792 | } |
36dc12cc | 5793 | } |
d0b96690 | 5794 | |
88e3c2f5 JG |
5795 | if (ua_chan->enabled != uchan->enabled) { |
5796 | ret = uchan->enabled ? | |
5797 | enable_ust_app_channel(ua_sess, uchan, app) : | |
5798 | disable_ust_app_channel(ua_sess, ua_chan, app); | |
5799 | if (ret) { | |
5800 | goto error_unlock; | |
5801 | } | |
5802 | } | |
36dc12cc | 5803 | } |
ef67c072 JG |
5804 | |
5805 | /* | |
5806 | * Create the metadata for the application. This returns gracefully if a | |
5807 | * metadata was already set for the session. | |
5808 | * | |
5809 | * The metadata channel must be created after the data channels as the | |
5810 | * consumer daemon assumes this ordering. When interacting with a relay | |
5811 | * daemon, the consumer will use this assumption to send the | |
5812 | * "STREAMS_SENT" message to the relay daemon. | |
5813 | */ | |
5814 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer); | |
5815 | if (ret < 0) { | |
5816 | goto error_unlock; | |
5817 | } | |
5818 | ||
88e3c2f5 | 5819 | rcu_read_unlock(); |
0498a00c | 5820 | |
a9ad0c8f | 5821 | end: |
88e3c2f5 | 5822 | pthread_mutex_unlock(&ua_sess->lock); |
ffe60014 | 5823 | /* Everything went well at this point. */ |
ffe60014 DG |
5824 | return; |
5825 | ||
d0b96690 | 5826 | error_unlock: |
88e3c2f5 | 5827 | rcu_read_unlock(); |
d0b96690 | 5828 | pthread_mutex_unlock(&ua_sess->lock); |
487cf67c | 5829 | error: |
ffe60014 | 5830 | if (ua_sess) { |
d0b96690 | 5831 | destroy_app_session(app, ua_sess); |
ffe60014 | 5832 | } |
487cf67c DG |
5833 | return; |
5834 | } | |
55cc08a6 | 5835 | |
a9ad0c8f MD |
5836 | static |
5837 | void ust_app_global_destroy(struct ltt_ust_session *usess, struct ust_app *app) | |
5838 | { | |
5839 | struct ust_app_session *ua_sess; | |
5840 | ||
5841 | ua_sess = lookup_session_by_app(usess, app); | |
5842 | if (ua_sess == NULL) { | |
5843 | return; | |
5844 | } | |
5845 | destroy_app_session(app, ua_sess); | |
5846 | } | |
5847 | ||
5848 | /* | |
5849 | * Add channels/events from UST global domain to registered apps at sock. | |
5850 | * | |
5851 | * Called with session lock held. | |
5852 | * Called with RCU read-side lock held. | |
5853 | */ | |
5854 | void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app) | |
5855 | { | |
5856 | assert(usess); | |
88e3c2f5 | 5857 | assert(usess->active); |
a9ad0c8f MD |
5858 | |
5859 | DBG2("UST app global update for app sock %d for session id %" PRIu64, | |
5860 | app->sock, usess->id); | |
5861 | ||
5862 | if (!app->compatible) { | |
5863 | return; | |
5864 | } | |
159b042f JG |
5865 | if (trace_ust_id_tracker_lookup(LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID, |
5866 | usess, app->pid) && | |
55c9e7ca | 5867 | trace_ust_id_tracker_lookup( |
159b042f JG |
5868 | LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID, |
5869 | usess, app->uid) && | |
55c9e7ca | 5870 | trace_ust_id_tracker_lookup( |
159b042f JG |
5871 | LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID, |
5872 | usess, app->gid)) { | |
88e3c2f5 JG |
5873 | /* |
5874 | * Synchronize the application's internal tracing configuration | |
5875 | * and start tracing. | |
5876 | */ | |
5877 | ust_app_synchronize(usess, app); | |
5878 | ust_app_start_trace(usess, app); | |
a9ad0c8f MD |
5879 | } else { |
5880 | ust_app_global_destroy(usess, app); | |
5881 | } | |
5882 | } | |
5883 | ||
993578ff JR |
5884 | /* |
5885 | * Add all event notifiers to an application. | |
5886 | * | |
5887 | * Called with session lock held. | |
5888 | * Called with RCU read-side lock held. | |
5889 | */ | |
5890 | void ust_app_global_update_event_notifier_rules(struct ust_app *app) | |
5891 | { | |
5892 | DBG2("UST application global event notifier rules update: app = '%s' (ppid: %d)", | |
5893 | app->name, app->ppid); | |
5894 | ||
5895 | if (!app->compatible) { | |
5896 | return; | |
5897 | } | |
5898 | ||
5899 | if (app->event_notifier_group.object == NULL) { | |
5900 | WARN("UST app global update of event notifiers for app skipped since communication handle is null: app = '%s' (ppid: %d)", | |
5901 | app->name, app->ppid); | |
5902 | return; | |
5903 | } | |
5904 | ||
5905 | ust_app_synchronize_event_notifier_rules(app); | |
5906 | } | |
5907 | ||
a9ad0c8f MD |
5908 | /* |
5909 | * Called with session lock held. | |
5910 | */ | |
5911 | void ust_app_global_update_all(struct ltt_ust_session *usess) | |
5912 | { | |
5913 | struct lttng_ht_iter iter; | |
5914 | struct ust_app *app; | |
5915 | ||
5916 | rcu_read_lock(); | |
5917 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5918 | ust_app_global_update(usess, app); | |
5919 | } | |
5920 | rcu_read_unlock(); | |
5921 | } | |
5922 | ||
993578ff JR |
5923 | void ust_app_global_update_all_event_notifier_rules(void) |
5924 | { | |
5925 | struct lttng_ht_iter iter; | |
5926 | struct ust_app *app; | |
5927 | ||
5928 | rcu_read_lock(); | |
5929 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5930 | ust_app_global_update_event_notifier_rules(app); | |
5931 | } | |
5932 | ||
5933 | rcu_read_unlock(); | |
5934 | } | |
5935 | ||
55cc08a6 DG |
5936 | /* |
5937 | * Add context to a specific channel for global UST domain. | |
5938 | */ | |
5939 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
5940 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
5941 | { | |
5942 | int ret = 0; | |
bec39940 DG |
5943 | struct lttng_ht_node_str *ua_chan_node; |
5944 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
5945 | struct ust_app_channel *ua_chan = NULL; |
5946 | struct ust_app_session *ua_sess; | |
5947 | struct ust_app *app; | |
5948 | ||
88e3c2f5 | 5949 | assert(usess->active); |
0498a00c | 5950 | |
55cc08a6 | 5951 | rcu_read_lock(); |
852d0037 | 5952 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
5953 | if (!app->compatible) { |
5954 | /* | |
5955 | * TODO: In time, we should notice the caller of this error by | |
5956 | * telling him that this is a version error. | |
5957 | */ | |
5958 | continue; | |
5959 | } | |
55cc08a6 DG |
5960 | ua_sess = lookup_session_by_app(usess, app); |
5961 | if (ua_sess == NULL) { | |
5962 | continue; | |
5963 | } | |
5964 | ||
d0b96690 | 5965 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
5966 | |
5967 | if (ua_sess->deleted) { | |
5968 | pthread_mutex_unlock(&ua_sess->lock); | |
5969 | continue; | |
5970 | } | |
5971 | ||
55cc08a6 | 5972 | /* Lookup channel in the ust app session */ |
bec39940 DG |
5973 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
5974 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 5975 | if (ua_chan_node == NULL) { |
d0b96690 | 5976 | goto next_app; |
55cc08a6 DG |
5977 | } |
5978 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
5979 | node); | |
c9edf082 | 5980 | ret = create_ust_app_channel_context(ua_chan, &uctx->ctx, app); |
55cc08a6 | 5981 | if (ret < 0) { |
d0b96690 | 5982 | goto next_app; |
55cc08a6 | 5983 | } |
d0b96690 DG |
5984 | next_app: |
5985 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
5986 | } |
5987 | ||
55cc08a6 | 5988 | rcu_read_unlock(); |
76d45b40 DG |
5989 | return ret; |
5990 | } | |
7f79d3a1 | 5991 | |
d0b96690 DG |
5992 | /* |
5993 | * Receive registration and populate the given msg structure. | |
5994 | * | |
5995 | * On success return 0 else a negative value returned by the ustctl call. | |
5996 | */ | |
5997 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
5998 | { | |
5999 | int ret; | |
6000 | uint32_t pid, ppid, uid, gid; | |
6001 | ||
6002 | assert(msg); | |
6003 | ||
6004 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
6005 | &pid, &ppid, &uid, &gid, | |
6006 | &msg->bits_per_long, | |
6007 | &msg->uint8_t_alignment, | |
6008 | &msg->uint16_t_alignment, | |
6009 | &msg->uint32_t_alignment, | |
6010 | &msg->uint64_t_alignment, | |
6011 | &msg->long_alignment, | |
6012 | &msg->byte_order, | |
6013 | msg->name); | |
6014 | if (ret < 0) { | |
6015 | switch (-ret) { | |
6016 | case EPIPE: | |
6017 | case ECONNRESET: | |
6018 | case LTTNG_UST_ERR_EXITING: | |
6019 | DBG3("UST app recv reg message failed. Application died"); | |
6020 | break; | |
6021 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
6022 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
6023 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
6024 | LTTNG_UST_ABI_MINOR_VERSION); | |
6025 | break; | |
6026 | default: | |
6027 | ERR("UST app recv reg message failed with ret %d", ret); | |
6028 | break; | |
6029 | } | |
6030 | goto error; | |
6031 | } | |
6032 | msg->pid = (pid_t) pid; | |
6033 | msg->ppid = (pid_t) ppid; | |
6034 | msg->uid = (uid_t) uid; | |
6035 | msg->gid = (gid_t) gid; | |
6036 | ||
6037 | error: | |
6038 | return ret; | |
6039 | } | |
6040 | ||
10b56aef MD |
6041 | /* |
6042 | * Return a ust app session object using the application object and the | |
6043 | * session object descriptor has a key. If not found, NULL is returned. | |
6044 | * A RCU read side lock MUST be acquired when calling this function. | |
6045 | */ | |
6046 | static struct ust_app_session *find_session_by_objd(struct ust_app *app, | |
6047 | int objd) | |
6048 | { | |
6049 | struct lttng_ht_node_ulong *node; | |
6050 | struct lttng_ht_iter iter; | |
6051 | struct ust_app_session *ua_sess = NULL; | |
6052 | ||
6053 | assert(app); | |
6054 | ||
6055 | lttng_ht_lookup(app->ust_sessions_objd, (void *)((unsigned long) objd), &iter); | |
6056 | node = lttng_ht_iter_get_node_ulong(&iter); | |
6057 | if (node == NULL) { | |
6058 | DBG2("UST app session find by objd %d not found", objd); | |
6059 | goto error; | |
6060 | } | |
6061 | ||
6062 | ua_sess = caa_container_of(node, struct ust_app_session, ust_objd_node); | |
6063 | ||
6064 | error: | |
6065 | return ua_sess; | |
6066 | } | |
6067 | ||
d88aee68 DG |
6068 | /* |
6069 | * Return a ust app channel object using the application object and the channel | |
6070 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
6071 | * lock MUST be acquired before calling this function. | |
6072 | */ | |
d0b96690 DG |
6073 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
6074 | int objd) | |
6075 | { | |
6076 | struct lttng_ht_node_ulong *node; | |
6077 | struct lttng_ht_iter iter; | |
6078 | struct ust_app_channel *ua_chan = NULL; | |
6079 | ||
6080 | assert(app); | |
6081 | ||
6082 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
6083 | node = lttng_ht_iter_get_node_ulong(&iter); | |
6084 | if (node == NULL) { | |
6085 | DBG2("UST app channel find by objd %d not found", objd); | |
6086 | goto error; | |
6087 | } | |
6088 | ||
6089 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
6090 | ||
6091 | error: | |
6092 | return ua_chan; | |
6093 | } | |
6094 | ||
d88aee68 DG |
6095 | /* |
6096 | * Reply to a register channel notification from an application on the notify | |
6097 | * socket. The channel metadata is also created. | |
6098 | * | |
6099 | * The session UST registry lock is acquired in this function. | |
6100 | * | |
6101 | * On success 0 is returned else a negative value. | |
6102 | */ | |
8eede835 | 6103 | static int reply_ust_register_channel(int sock, int cobjd, |
d0b96690 DG |
6104 | size_t nr_fields, struct ustctl_field *fields) |
6105 | { | |
6106 | int ret, ret_code = 0; | |
294e218e | 6107 | uint32_t chan_id; |
7972aab2 | 6108 | uint64_t chan_reg_key; |
d0b96690 DG |
6109 | enum ustctl_channel_header type; |
6110 | struct ust_app *app; | |
6111 | struct ust_app_channel *ua_chan; | |
6112 | struct ust_app_session *ua_sess; | |
7972aab2 | 6113 | struct ust_registry_session *registry; |
45893984 | 6114 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
6115 | |
6116 | rcu_read_lock(); | |
6117 | ||
6118 | /* Lookup application. If not found, there is a code flow error. */ | |
6119 | app = find_app_by_notify_sock(sock); | |
d88aee68 | 6120 | if (!app) { |
fad1ed2f | 6121 | DBG("Application socket %d is being torn down. Abort event notify", |
d88aee68 DG |
6122 | sock); |
6123 | ret = 0; | |
6124 | goto error_rcu_unlock; | |
6125 | } | |
d0b96690 | 6126 | |
4950b860 | 6127 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 6128 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 | 6129 | if (!ua_chan) { |
fad1ed2f | 6130 | DBG("Application channel is being torn down. Abort event notify"); |
4950b860 MD |
6131 | ret = 0; |
6132 | goto error_rcu_unlock; | |
6133 | } | |
6134 | ||
d0b96690 DG |
6135 | assert(ua_chan->session); |
6136 | ua_sess = ua_chan->session; | |
d0b96690 | 6137 | |
7972aab2 DG |
6138 | /* Get right session registry depending on the session buffer type. */ |
6139 | registry = get_session_registry(ua_sess); | |
fad1ed2f JR |
6140 | if (!registry) { |
6141 | DBG("Application session is being torn down. Abort event notify"); | |
6142 | ret = 0; | |
6143 | goto error_rcu_unlock; | |
6144 | }; | |
45893984 | 6145 | |
7972aab2 DG |
6146 | /* Depending on the buffer type, a different channel key is used. */ |
6147 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
6148 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 6149 | } else { |
7972aab2 | 6150 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
6151 | } |
6152 | ||
7972aab2 DG |
6153 | pthread_mutex_lock(®istry->lock); |
6154 | ||
6155 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
6156 | assert(chan_reg); | |
6157 | ||
6158 | if (!chan_reg->register_done) { | |
294e218e MD |
6159 | /* |
6160 | * TODO: eventually use the registry event count for | |
6161 | * this channel to better guess header type for per-pid | |
6162 | * buffers. | |
6163 | */ | |
6164 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
7972aab2 DG |
6165 | chan_reg->nr_ctx_fields = nr_fields; |
6166 | chan_reg->ctx_fields = fields; | |
fad1ed2f | 6167 | fields = NULL; |
7972aab2 | 6168 | chan_reg->header_type = type; |
d0b96690 | 6169 | } else { |
7972aab2 DG |
6170 | /* Get current already assigned values. */ |
6171 | type = chan_reg->header_type; | |
d0b96690 | 6172 | } |
7972aab2 DG |
6173 | /* Channel id is set during the object creation. */ |
6174 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
6175 | |
6176 | /* Append to metadata */ | |
7972aab2 DG |
6177 | if (!chan_reg->metadata_dumped) { |
6178 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
6179 | if (ret_code) { |
6180 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
6181 | goto reply; | |
6182 | } | |
6183 | } | |
6184 | ||
6185 | reply: | |
7972aab2 DG |
6186 | DBG3("UST app replying to register channel key %" PRIu64 |
6187 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
6188 | ret_code); | |
d0b96690 DG |
6189 | |
6190 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
6191 | if (ret < 0) { | |
6192 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6193 | ERR("UST app reply channel failed with ret %d", ret); | |
6194 | } else { | |
6195 | DBG3("UST app reply channel failed. Application died"); | |
6196 | } | |
6197 | goto error; | |
6198 | } | |
6199 | ||
7972aab2 DG |
6200 | /* This channel registry registration is completed. */ |
6201 | chan_reg->register_done = 1; | |
6202 | ||
d0b96690 | 6203 | error: |
7972aab2 | 6204 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 6205 | error_rcu_unlock: |
d0b96690 | 6206 | rcu_read_unlock(); |
fad1ed2f | 6207 | free(fields); |
d0b96690 DG |
6208 | return ret; |
6209 | } | |
6210 | ||
d88aee68 DG |
6211 | /* |
6212 | * Add event to the UST channel registry. When the event is added to the | |
6213 | * registry, the metadata is also created. Once done, this replies to the | |
6214 | * application with the appropriate error code. | |
6215 | * | |
6216 | * The session UST registry lock is acquired in the function. | |
6217 | * | |
6218 | * On success 0 is returned else a negative value. | |
6219 | */ | |
d0b96690 | 6220 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
2106efa0 PP |
6221 | char *sig, size_t nr_fields, struct ustctl_field *fields, |
6222 | int loglevel_value, char *model_emf_uri) | |
d0b96690 DG |
6223 | { |
6224 | int ret, ret_code; | |
6225 | uint32_t event_id = 0; | |
7972aab2 | 6226 | uint64_t chan_reg_key; |
d0b96690 DG |
6227 | struct ust_app *app; |
6228 | struct ust_app_channel *ua_chan; | |
6229 | struct ust_app_session *ua_sess; | |
7972aab2 | 6230 | struct ust_registry_session *registry; |
d0b96690 DG |
6231 | |
6232 | rcu_read_lock(); | |
6233 | ||
6234 | /* Lookup application. If not found, there is a code flow error. */ | |
6235 | app = find_app_by_notify_sock(sock); | |
d88aee68 | 6236 | if (!app) { |
fad1ed2f | 6237 | DBG("Application socket %d is being torn down. Abort event notify", |
d88aee68 DG |
6238 | sock); |
6239 | ret = 0; | |
6240 | goto error_rcu_unlock; | |
6241 | } | |
d0b96690 | 6242 | |
4950b860 | 6243 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 6244 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 | 6245 | if (!ua_chan) { |
fad1ed2f | 6246 | DBG("Application channel is being torn down. Abort event notify"); |
4950b860 MD |
6247 | ret = 0; |
6248 | goto error_rcu_unlock; | |
6249 | } | |
6250 | ||
d0b96690 DG |
6251 | assert(ua_chan->session); |
6252 | ua_sess = ua_chan->session; | |
6253 | ||
7972aab2 | 6254 | registry = get_session_registry(ua_sess); |
fad1ed2f JR |
6255 | if (!registry) { |
6256 | DBG("Application session is being torn down. Abort event notify"); | |
6257 | ret = 0; | |
6258 | goto error_rcu_unlock; | |
6259 | } | |
7972aab2 DG |
6260 | |
6261 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
6262 | chan_reg_key = ua_chan->tracing_channel_id; | |
6263 | } else { | |
6264 | chan_reg_key = ua_chan->key; | |
6265 | } | |
6266 | ||
6267 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 6268 | |
d5d629b5 DG |
6269 | /* |
6270 | * From this point on, this call acquires the ownership of the sig, fields | |
6271 | * and model_emf_uri meaning any free are done inside it if needed. These | |
6272 | * three variables MUST NOT be read/write after this. | |
6273 | */ | |
7972aab2 | 6274 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
2106efa0 PP |
6275 | sobjd, cobjd, name, sig, nr_fields, fields, |
6276 | loglevel_value, model_emf_uri, ua_sess->buffer_type, | |
6277 | &event_id, app); | |
fad1ed2f JR |
6278 | sig = NULL; |
6279 | fields = NULL; | |
6280 | model_emf_uri = NULL; | |
d0b96690 DG |
6281 | |
6282 | /* | |
6283 | * The return value is returned to ustctl so in case of an error, the | |
6284 | * application can be notified. In case of an error, it's important not to | |
6285 | * return a negative error or else the application will get closed. | |
6286 | */ | |
6287 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
6288 | if (ret < 0) { | |
6289 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6290 | ERR("UST app reply event failed with ret %d", ret); | |
6291 | } else { | |
6292 | DBG3("UST app reply event failed. Application died"); | |
6293 | } | |
6294 | /* | |
6295 | * No need to wipe the create event since the application socket will | |
6296 | * get close on error hence cleaning up everything by itself. | |
6297 | */ | |
6298 | goto error; | |
6299 | } | |
6300 | ||
7972aab2 DG |
6301 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
6302 | name, event_id); | |
d88aee68 | 6303 | |
d0b96690 | 6304 | error: |
7972aab2 | 6305 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 6306 | error_rcu_unlock: |
d0b96690 | 6307 | rcu_read_unlock(); |
fad1ed2f JR |
6308 | free(sig); |
6309 | free(fields); | |
6310 | free(model_emf_uri); | |
d0b96690 DG |
6311 | return ret; |
6312 | } | |
6313 | ||
10b56aef MD |
6314 | /* |
6315 | * Add enum to the UST session registry. Once done, this replies to the | |
6316 | * application with the appropriate error code. | |
6317 | * | |
6318 | * The session UST registry lock is acquired within this function. | |
6319 | * | |
6320 | * On success 0 is returned else a negative value. | |
6321 | */ | |
6322 | static int add_enum_ust_registry(int sock, int sobjd, char *name, | |
6323 | struct ustctl_enum_entry *entries, size_t nr_entries) | |
6324 | { | |
6325 | int ret = 0, ret_code; | |
6326 | struct ust_app *app; | |
6327 | struct ust_app_session *ua_sess; | |
6328 | struct ust_registry_session *registry; | |
6329 | uint64_t enum_id = -1ULL; | |
6330 | ||
6331 | rcu_read_lock(); | |
6332 | ||
6333 | /* Lookup application. If not found, there is a code flow error. */ | |
6334 | app = find_app_by_notify_sock(sock); | |
6335 | if (!app) { | |
6336 | /* Return an error since this is not an error */ | |
6337 | DBG("Application socket %d is being torn down. Aborting enum registration", | |
6338 | sock); | |
6339 | free(entries); | |
6340 | goto error_rcu_unlock; | |
6341 | } | |
6342 | ||
6343 | /* Lookup session by UST object descriptor. */ | |
6344 | ua_sess = find_session_by_objd(app, sobjd); | |
6345 | if (!ua_sess) { | |
6346 | /* Return an error since this is not an error */ | |
fad1ed2f | 6347 | DBG("Application session is being torn down (session not found). Aborting enum registration."); |
10b56aef MD |
6348 | free(entries); |
6349 | goto error_rcu_unlock; | |
6350 | } | |
6351 | ||
6352 | registry = get_session_registry(ua_sess); | |
fad1ed2f JR |
6353 | if (!registry) { |
6354 | DBG("Application session is being torn down (registry not found). Aborting enum registration."); | |
6355 | free(entries); | |
6356 | goto error_rcu_unlock; | |
6357 | } | |
10b56aef MD |
6358 | |
6359 | pthread_mutex_lock(®istry->lock); | |
6360 | ||
6361 | /* | |
6362 | * From this point on, the callee acquires the ownership of | |
6363 | * entries. The variable entries MUST NOT be read/written after | |
6364 | * call. | |
6365 | */ | |
6366 | ret_code = ust_registry_create_or_find_enum(registry, sobjd, name, | |
6367 | entries, nr_entries, &enum_id); | |
6368 | entries = NULL; | |
6369 | ||
6370 | /* | |
6371 | * The return value is returned to ustctl so in case of an error, the | |
6372 | * application can be notified. In case of an error, it's important not to | |
6373 | * return a negative error or else the application will get closed. | |
6374 | */ | |
6375 | ret = ustctl_reply_register_enum(sock, enum_id, ret_code); | |
6376 | if (ret < 0) { | |
6377 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6378 | ERR("UST app reply enum failed with ret %d", ret); | |
6379 | } else { | |
6380 | DBG3("UST app reply enum failed. Application died"); | |
6381 | } | |
6382 | /* | |
6383 | * No need to wipe the create enum since the application socket will | |
6384 | * get close on error hence cleaning up everything by itself. | |
6385 | */ | |
6386 | goto error; | |
6387 | } | |
6388 | ||
6389 | DBG3("UST registry enum %s added successfully or already found", name); | |
6390 | ||
6391 | error: | |
6392 | pthread_mutex_unlock(®istry->lock); | |
6393 | error_rcu_unlock: | |
6394 | rcu_read_unlock(); | |
6395 | return ret; | |
6396 | } | |
6397 | ||
d88aee68 DG |
6398 | /* |
6399 | * Handle application notification through the given notify socket. | |
6400 | * | |
6401 | * Return 0 on success or else a negative value. | |
6402 | */ | |
d0b96690 DG |
6403 | int ust_app_recv_notify(int sock) |
6404 | { | |
6405 | int ret; | |
6406 | enum ustctl_notify_cmd cmd; | |
6407 | ||
6408 | DBG3("UST app receiving notify from sock %d", sock); | |
6409 | ||
6410 | ret = ustctl_recv_notify(sock, &cmd); | |
6411 | if (ret < 0) { | |
6412 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6413 | ERR("UST app recv notify failed with ret %d", ret); | |
6414 | } else { | |
6415 | DBG3("UST app recv notify failed. Application died"); | |
6416 | } | |
6417 | goto error; | |
6418 | } | |
6419 | ||
6420 | switch (cmd) { | |
6421 | case USTCTL_NOTIFY_CMD_EVENT: | |
6422 | { | |
2106efa0 | 6423 | int sobjd, cobjd, loglevel_value; |
d0b96690 DG |
6424 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; |
6425 | size_t nr_fields; | |
6426 | struct ustctl_field *fields; | |
6427 | ||
6428 | DBG2("UST app ustctl register event received"); | |
6429 | ||
2106efa0 PP |
6430 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, |
6431 | &loglevel_value, &sig, &nr_fields, &fields, | |
6432 | &model_emf_uri); | |
d0b96690 DG |
6433 | if (ret < 0) { |
6434 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6435 | ERR("UST app recv event failed with ret %d", ret); | |
6436 | } else { | |
6437 | DBG3("UST app recv event failed. Application died"); | |
6438 | } | |
6439 | goto error; | |
6440 | } | |
6441 | ||
d5d629b5 DG |
6442 | /* |
6443 | * Add event to the UST registry coming from the notify socket. This | |
6444 | * call will free if needed the sig, fields and model_emf_uri. This | |
6445 | * code path loses the ownsership of these variables and transfer them | |
6446 | * to the this function. | |
6447 | */ | |
d0b96690 | 6448 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
2106efa0 | 6449 | fields, loglevel_value, model_emf_uri); |
d0b96690 DG |
6450 | if (ret < 0) { |
6451 | goto error; | |
6452 | } | |
6453 | ||
6454 | break; | |
6455 | } | |
6456 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
6457 | { | |
6458 | int sobjd, cobjd; | |
6459 | size_t nr_fields; | |
6460 | struct ustctl_field *fields; | |
6461 | ||
6462 | DBG2("UST app ustctl register channel received"); | |
6463 | ||
6464 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
6465 | &fields); | |
6466 | if (ret < 0) { | |
6467 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6468 | ERR("UST app recv channel failed with ret %d", ret); | |
6469 | } else { | |
6470 | DBG3("UST app recv channel failed. Application died"); | |
6471 | } | |
6472 | goto error; | |
6473 | } | |
6474 | ||
d5d629b5 DG |
6475 | /* |
6476 | * The fields ownership are transfered to this function call meaning | |
6477 | * that if needed it will be freed. After this, it's invalid to access | |
6478 | * fields or clean it up. | |
6479 | */ | |
8eede835 | 6480 | ret = reply_ust_register_channel(sock, cobjd, nr_fields, |
d0b96690 DG |
6481 | fields); |
6482 | if (ret < 0) { | |
6483 | goto error; | |
6484 | } | |
6485 | ||
6486 | break; | |
6487 | } | |
10b56aef MD |
6488 | case USTCTL_NOTIFY_CMD_ENUM: |
6489 | { | |
6490 | int sobjd; | |
6491 | char name[LTTNG_UST_SYM_NAME_LEN]; | |
6492 | size_t nr_entries; | |
6493 | struct ustctl_enum_entry *entries; | |
6494 | ||
6495 | DBG2("UST app ustctl register enum received"); | |
6496 | ||
6497 | ret = ustctl_recv_register_enum(sock, &sobjd, name, | |
6498 | &entries, &nr_entries); | |
6499 | if (ret < 0) { | |
6500 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6501 | ERR("UST app recv enum failed with ret %d", ret); | |
6502 | } else { | |
6503 | DBG3("UST app recv enum failed. Application died"); | |
6504 | } | |
6505 | goto error; | |
6506 | } | |
6507 | ||
6508 | /* Callee assumes ownership of entries */ | |
6509 | ret = add_enum_ust_registry(sock, sobjd, name, | |
6510 | entries, nr_entries); | |
6511 | if (ret < 0) { | |
6512 | goto error; | |
6513 | } | |
6514 | ||
6515 | break; | |
6516 | } | |
d0b96690 DG |
6517 | default: |
6518 | /* Should NEVER happen. */ | |
6519 | assert(0); | |
6520 | } | |
6521 | ||
6522 | error: | |
6523 | return ret; | |
6524 | } | |
d88aee68 DG |
6525 | |
6526 | /* | |
6527 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
6528 | * corresponding application. On failure, the call_rcu to close the socket is | |
6529 | * executed. If an application is found, it tries to delete it from the notify | |
6530 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
6531 | * | |
6532 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
6533 | * call RCU is not done but the rest of the cleanup is. | |
6534 | */ | |
6535 | void ust_app_notify_sock_unregister(int sock) | |
6536 | { | |
6537 | int err_enomem = 0; | |
6538 | struct lttng_ht_iter iter; | |
6539 | struct ust_app *app; | |
6540 | struct ust_app_notify_sock_obj *obj; | |
6541 | ||
6542 | assert(sock >= 0); | |
6543 | ||
6544 | rcu_read_lock(); | |
6545 | ||
6546 | obj = zmalloc(sizeof(*obj)); | |
6547 | if (!obj) { | |
6548 | /* | |
6549 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
6550 | * procedure but the call_rcu will not be called. In this case, we | |
6551 | * accept the fd leak rather than possibly creating an unsynchronized | |
6552 | * state between threads. | |
6553 | * | |
6554 | * TODO: The notify object should be created once the notify socket is | |
6555 | * registered and stored independantely from the ust app object. The | |
6556 | * tricky part is to synchronize the teardown of the application and | |
6557 | * this notify object. Let's keep that in mind so we can avoid this | |
6558 | * kind of shenanigans with ENOMEM in the teardown path. | |
6559 | */ | |
6560 | err_enomem = 1; | |
6561 | } else { | |
6562 | obj->fd = sock; | |
6563 | } | |
6564 | ||
6565 | DBG("UST app notify socket unregister %d", sock); | |
6566 | ||
6567 | /* | |
6568 | * Lookup application by notify socket. If this fails, this means that the | |
6569 | * hash table delete has already been done by the application | |
6570 | * unregistration process so we can safely close the notify socket in a | |
6571 | * call RCU. | |
6572 | */ | |
6573 | app = find_app_by_notify_sock(sock); | |
6574 | if (!app) { | |
6575 | goto close_socket; | |
6576 | } | |
6577 | ||
6578 | iter.iter.node = &app->notify_sock_n.node; | |
6579 | ||
6580 | /* | |
6581 | * Whatever happens here either we fail or succeed, in both cases we have | |
6582 | * to close the socket after a grace period to continue to the call RCU | |
6583 | * here. If the deletion is successful, the application is not visible | |
6584 | * anymore by other threads and is it fails it means that it was already | |
6585 | * deleted from the hash table so either way we just have to close the | |
6586 | * socket. | |
6587 | */ | |
6588 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
6589 | ||
6590 | close_socket: | |
6591 | rcu_read_unlock(); | |
6592 | ||
6593 | /* | |
6594 | * Close socket after a grace period to avoid for the socket to be reused | |
6595 | * before the application object is freed creating potential race between | |
6596 | * threads trying to add unique in the global hash table. | |
6597 | */ | |
6598 | if (!err_enomem) { | |
6599 | call_rcu(&obj->head, close_notify_sock_rcu); | |
6600 | } | |
6601 | } | |
f45e313d DG |
6602 | |
6603 | /* | |
6604 | * Destroy a ust app data structure and free its memory. | |
6605 | */ | |
6606 | void ust_app_destroy(struct ust_app *app) | |
6607 | { | |
6608 | if (!app) { | |
6609 | return; | |
6610 | } | |
6611 | ||
6612 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
6613 | } | |
6dc3064a DG |
6614 | |
6615 | /* | |
6616 | * Take a snapshot for a given UST session. The snapshot is sent to the given | |
6617 | * output. | |
6618 | * | |
9a654598 | 6619 | * Returns LTTNG_OK on success or a LTTNG_ERR error code. |
6dc3064a | 6620 | */ |
fb9a95c4 JG |
6621 | enum lttng_error_code ust_app_snapshot_record( |
6622 | const struct ltt_ust_session *usess, | |
348a81dc | 6623 | const struct consumer_output *output, int wait, |
d07ceecd | 6624 | uint64_t nb_packets_per_stream) |
6dc3064a DG |
6625 | { |
6626 | int ret = 0; | |
9a654598 | 6627 | enum lttng_error_code status = LTTNG_OK; |
6dc3064a DG |
6628 | struct lttng_ht_iter iter; |
6629 | struct ust_app *app; | |
affce97e | 6630 | char *trace_path = NULL; |
6dc3064a DG |
6631 | |
6632 | assert(usess); | |
6633 | assert(output); | |
6634 | ||
6635 | rcu_read_lock(); | |
6636 | ||
8c924c7b MD |
6637 | switch (usess->buffer_type) { |
6638 | case LTTNG_BUFFER_PER_UID: | |
6639 | { | |
6640 | struct buffer_reg_uid *reg; | |
6dc3064a | 6641 | |
8c924c7b MD |
6642 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
6643 | struct buffer_reg_channel *reg_chan; | |
6644 | struct consumer_socket *socket; | |
3b967712 | 6645 | char pathname[PATH_MAX]; |
5da88b0f | 6646 | size_t consumer_path_offset = 0; |
6dc3064a | 6647 | |
2b269489 JR |
6648 | if (!reg->registry->reg.ust->metadata_key) { |
6649 | /* Skip since no metadata is present */ | |
6650 | continue; | |
6651 | } | |
6652 | ||
8c924c7b MD |
6653 | /* Get consumer socket to use to push the metadata.*/ |
6654 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
6655 | usess->consumer); | |
6656 | if (!socket) { | |
9a654598 | 6657 | status = LTTNG_ERR_INVALID; |
8c924c7b MD |
6658 | goto error; |
6659 | } | |
6dc3064a | 6660 | |
8c924c7b MD |
6661 | memset(pathname, 0, sizeof(pathname)); |
6662 | ret = snprintf(pathname, sizeof(pathname), | |
5da88b0f | 6663 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH, |
8c924c7b MD |
6664 | reg->uid, reg->bits_per_long); |
6665 | if (ret < 0) { | |
6666 | PERROR("snprintf snapshot path"); | |
9a654598 | 6667 | status = LTTNG_ERR_INVALID; |
8c924c7b MD |
6668 | goto error; |
6669 | } | |
affce97e JG |
6670 | /* Free path allowed on previous iteration. */ |
6671 | free(trace_path); | |
5da88b0f MD |
6672 | trace_path = setup_channel_trace_path(usess->consumer, pathname, |
6673 | &consumer_path_offset); | |
3b967712 MD |
6674 | if (!trace_path) { |
6675 | status = LTTNG_ERR_INVALID; | |
6676 | goto error; | |
6677 | } | |
f3db82be | 6678 | /* Add the UST default trace dir to path. */ |
8c924c7b MD |
6679 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
6680 | reg_chan, node.node) { | |
9a654598 | 6681 | status = consumer_snapshot_channel(socket, |
e098433c JG |
6682 | reg_chan->consumer_key, |
6683 | output, 0, usess->uid, | |
5da88b0f | 6684 | usess->gid, &trace_path[consumer_path_offset], wait, |
d2956687 | 6685 | nb_packets_per_stream); |
9a654598 | 6686 | if (status != LTTNG_OK) { |
8c924c7b MD |
6687 | goto error; |
6688 | } | |
6689 | } | |
9a654598 | 6690 | status = consumer_snapshot_channel(socket, |
68808f4e | 6691 | reg->registry->reg.ust->metadata_key, output, 1, |
5da88b0f MD |
6692 | usess->uid, usess->gid, &trace_path[consumer_path_offset], |
6693 | wait, 0); | |
9a654598 | 6694 | if (status != LTTNG_OK) { |
8c924c7b MD |
6695 | goto error; |
6696 | } | |
af706bb7 | 6697 | } |
8c924c7b MD |
6698 | break; |
6699 | } | |
6700 | case LTTNG_BUFFER_PER_PID: | |
6701 | { | |
6702 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6703 | struct consumer_socket *socket; | |
6704 | struct lttng_ht_iter chan_iter; | |
6705 | struct ust_app_channel *ua_chan; | |
6706 | struct ust_app_session *ua_sess; | |
6707 | struct ust_registry_session *registry; | |
3b967712 | 6708 | char pathname[PATH_MAX]; |
5da88b0f | 6709 | size_t consumer_path_offset = 0; |
8c924c7b MD |
6710 | |
6711 | ua_sess = lookup_session_by_app(usess, app); | |
6712 | if (!ua_sess) { | |
6713 | /* Session not associated with this app. */ | |
6714 | continue; | |
6715 | } | |
af706bb7 | 6716 | |
8c924c7b MD |
6717 | /* Get the right consumer socket for the application. */ |
6718 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
348a81dc | 6719 | output); |
8c924c7b | 6720 | if (!socket) { |
9a654598 | 6721 | status = LTTNG_ERR_INVALID; |
5c786ded JD |
6722 | goto error; |
6723 | } | |
6724 | ||
8c924c7b MD |
6725 | /* Add the UST default trace dir to path. */ |
6726 | memset(pathname, 0, sizeof(pathname)); | |
5da88b0f | 6727 | ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "/%s", |
8c924c7b | 6728 | ua_sess->path); |
6dc3064a | 6729 | if (ret < 0) { |
9a654598 | 6730 | status = LTTNG_ERR_INVALID; |
8c924c7b | 6731 | PERROR("snprintf snapshot path"); |
6dc3064a DG |
6732 | goto error; |
6733 | } | |
affce97e JG |
6734 | /* Free path allowed on previous iteration. */ |
6735 | free(trace_path); | |
5da88b0f MD |
6736 | trace_path = setup_channel_trace_path(usess->consumer, pathname, |
6737 | &consumer_path_offset); | |
3b967712 MD |
6738 | if (!trace_path) { |
6739 | status = LTTNG_ERR_INVALID; | |
6740 | goto error; | |
6741 | } | |
f3db82be | 6742 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, |
8c924c7b | 6743 | ua_chan, node.node) { |
9a654598 | 6744 | status = consumer_snapshot_channel(socket, |
470cc211 | 6745 | ua_chan->key, output, 0, |
ff588497 JR |
6746 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
6747 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
5da88b0f | 6748 | &trace_path[consumer_path_offset], wait, |
d2956687 | 6749 | nb_packets_per_stream); |
9a654598 JG |
6750 | switch (status) { |
6751 | case LTTNG_OK: | |
6752 | break; | |
6753 | case LTTNG_ERR_CHAN_NOT_FOUND: | |
6754 | continue; | |
6755 | default: | |
8c924c7b MD |
6756 | goto error; |
6757 | } | |
6758 | } | |
6759 | ||
6760 | registry = get_session_registry(ua_sess); | |
fad1ed2f | 6761 | if (!registry) { |
9bbfb88c MD |
6762 | DBG("Application session is being torn down. Skip application."); |
6763 | continue; | |
fad1ed2f | 6764 | } |
9a654598 | 6765 | status = consumer_snapshot_channel(socket, |
470cc211 | 6766 | registry->metadata_key, output, 1, |
ff588497 JR |
6767 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
6768 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
5da88b0f | 6769 | &trace_path[consumer_path_offset], wait, 0); |
9a654598 JG |
6770 | switch (status) { |
6771 | case LTTNG_OK: | |
6772 | break; | |
6773 | case LTTNG_ERR_CHAN_NOT_FOUND: | |
6774 | continue; | |
6775 | default: | |
8c924c7b MD |
6776 | goto error; |
6777 | } | |
6778 | } | |
6779 | break; | |
6780 | } | |
6781 | default: | |
6782 | assert(0); | |
6783 | break; | |
6dc3064a DG |
6784 | } |
6785 | ||
6786 | error: | |
affce97e | 6787 | free(trace_path); |
6dc3064a | 6788 | rcu_read_unlock(); |
9a654598 | 6789 | return status; |
6dc3064a | 6790 | } |
5c786ded JD |
6791 | |
6792 | /* | |
d07ceecd | 6793 | * Return the size taken by one more packet per stream. |
5c786ded | 6794 | */ |
fb9a95c4 JG |
6795 | uint64_t ust_app_get_size_one_more_packet_per_stream( |
6796 | const struct ltt_ust_session *usess, uint64_t cur_nr_packets) | |
5c786ded | 6797 | { |
d07ceecd | 6798 | uint64_t tot_size = 0; |
5c786ded JD |
6799 | struct ust_app *app; |
6800 | struct lttng_ht_iter iter; | |
6801 | ||
6802 | assert(usess); | |
6803 | ||
6804 | switch (usess->buffer_type) { | |
6805 | case LTTNG_BUFFER_PER_UID: | |
6806 | { | |
6807 | struct buffer_reg_uid *reg; | |
6808 | ||
6809 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
6810 | struct buffer_reg_channel *reg_chan; | |
6811 | ||
b7064eaa | 6812 | rcu_read_lock(); |
5c786ded JD |
6813 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
6814 | reg_chan, node.node) { | |
d07ceecd MD |
6815 | if (cur_nr_packets >= reg_chan->num_subbuf) { |
6816 | /* | |
6817 | * Don't take channel into account if we | |
6818 | * already grab all its packets. | |
6819 | */ | |
6820 | continue; | |
6821 | } | |
6822 | tot_size += reg_chan->subbuf_size * reg_chan->stream_count; | |
5c786ded | 6823 | } |
b7064eaa | 6824 | rcu_read_unlock(); |
5c786ded JD |
6825 | } |
6826 | break; | |
6827 | } | |
6828 | case LTTNG_BUFFER_PER_PID: | |
6829 | { | |
6830 | rcu_read_lock(); | |
6831 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6832 | struct ust_app_channel *ua_chan; | |
6833 | struct ust_app_session *ua_sess; | |
6834 | struct lttng_ht_iter chan_iter; | |
6835 | ||
6836 | ua_sess = lookup_session_by_app(usess, app); | |
6837 | if (!ua_sess) { | |
6838 | /* Session not associated with this app. */ | |
6839 | continue; | |
6840 | } | |
6841 | ||
6842 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
6843 | ua_chan, node.node) { | |
d07ceecd MD |
6844 | if (cur_nr_packets >= ua_chan->attr.num_subbuf) { |
6845 | /* | |
6846 | * Don't take channel into account if we | |
6847 | * already grab all its packets. | |
6848 | */ | |
6849 | continue; | |
6850 | } | |
6851 | tot_size += ua_chan->attr.subbuf_size * ua_chan->streams.count; | |
5c786ded JD |
6852 | } |
6853 | } | |
6854 | rcu_read_unlock(); | |
6855 | break; | |
6856 | } | |
6857 | default: | |
6858 | assert(0); | |
6859 | break; | |
6860 | } | |
6861 | ||
d07ceecd | 6862 | return tot_size; |
5c786ded | 6863 | } |
fb83fe64 JD |
6864 | |
6865 | int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id, | |
6866 | struct cds_list_head *buffer_reg_uid_list, | |
6867 | struct consumer_output *consumer, uint64_t uchan_id, | |
6868 | int overwrite, uint64_t *discarded, uint64_t *lost) | |
6869 | { | |
6870 | int ret; | |
6871 | uint64_t consumer_chan_key; | |
6872 | ||
70dd8162 MD |
6873 | *discarded = 0; |
6874 | *lost = 0; | |
6875 | ||
fb83fe64 | 6876 | ret = buffer_reg_uid_consumer_channel_key( |
76604852 | 6877 | buffer_reg_uid_list, uchan_id, &consumer_chan_key); |
fb83fe64 | 6878 | if (ret < 0) { |
70dd8162 MD |
6879 | /* Not found */ |
6880 | ret = 0; | |
fb83fe64 JD |
6881 | goto end; |
6882 | } | |
6883 | ||
6884 | if (overwrite) { | |
6885 | ret = consumer_get_lost_packets(ust_session_id, | |
6886 | consumer_chan_key, consumer, lost); | |
6887 | } else { | |
6888 | ret = consumer_get_discarded_events(ust_session_id, | |
6889 | consumer_chan_key, consumer, discarded); | |
6890 | } | |
6891 | ||
6892 | end: | |
6893 | return ret; | |
6894 | } | |
6895 | ||
6896 | int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess, | |
6897 | struct ltt_ust_channel *uchan, | |
6898 | struct consumer_output *consumer, int overwrite, | |
6899 | uint64_t *discarded, uint64_t *lost) | |
6900 | { | |
6901 | int ret = 0; | |
6902 | struct lttng_ht_iter iter; | |
6903 | struct lttng_ht_node_str *ua_chan_node; | |
6904 | struct ust_app *app; | |
6905 | struct ust_app_session *ua_sess; | |
6906 | struct ust_app_channel *ua_chan; | |
6907 | ||
70dd8162 MD |
6908 | *discarded = 0; |
6909 | *lost = 0; | |
6910 | ||
fb83fe64 JD |
6911 | rcu_read_lock(); |
6912 | /* | |
70dd8162 MD |
6913 | * Iterate over every registered applications. Sum counters for |
6914 | * all applications containing requested session and channel. | |
fb83fe64 JD |
6915 | */ |
6916 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6917 | struct lttng_ht_iter uiter; | |
6918 | ||
6919 | ua_sess = lookup_session_by_app(usess, app); | |
6920 | if (ua_sess == NULL) { | |
6921 | continue; | |
6922 | } | |
6923 | ||
6924 | /* Get channel */ | |
ee022399 | 6925 | lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &uiter); |
fb83fe64 JD |
6926 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); |
6927 | /* If the session is found for the app, the channel must be there */ | |
6928 | assert(ua_chan_node); | |
6929 | ||
6930 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
6931 | ||
6932 | if (overwrite) { | |
70dd8162 MD |
6933 | uint64_t _lost; |
6934 | ||
fb83fe64 | 6935 | ret = consumer_get_lost_packets(usess->id, ua_chan->key, |
70dd8162 MD |
6936 | consumer, &_lost); |
6937 | if (ret < 0) { | |
6938 | break; | |
6939 | } | |
6940 | (*lost) += _lost; | |
fb83fe64 | 6941 | } else { |
70dd8162 MD |
6942 | uint64_t _discarded; |
6943 | ||
fb83fe64 | 6944 | ret = consumer_get_discarded_events(usess->id, |
70dd8162 MD |
6945 | ua_chan->key, consumer, &_discarded); |
6946 | if (ret < 0) { | |
6947 | break; | |
6948 | } | |
6949 | (*discarded) += _discarded; | |
fb83fe64 | 6950 | } |
fb83fe64 JD |
6951 | } |
6952 | ||
fb83fe64 JD |
6953 | rcu_read_unlock(); |
6954 | return ret; | |
6955 | } | |
c2561365 JD |
6956 | |
6957 | static | |
6958 | int ust_app_regenerate_statedump(struct ltt_ust_session *usess, | |
6959 | struct ust_app *app) | |
6960 | { | |
6961 | int ret = 0; | |
6962 | struct ust_app_session *ua_sess; | |
6963 | ||
6964 | DBG("Regenerating the metadata for ust app pid %d", app->pid); | |
6965 | ||
6966 | rcu_read_lock(); | |
6967 | ||
6968 | ua_sess = lookup_session_by_app(usess, app); | |
6969 | if (ua_sess == NULL) { | |
6970 | /* The session is in teardown process. Ignore and continue. */ | |
6971 | goto end; | |
6972 | } | |
6973 | ||
6974 | pthread_mutex_lock(&ua_sess->lock); | |
6975 | ||
6976 | if (ua_sess->deleted) { | |
6977 | goto end_unlock; | |
6978 | } | |
6979 | ||
6980 | pthread_mutex_lock(&app->sock_lock); | |
6981 | ret = ustctl_regenerate_statedump(app->sock, ua_sess->handle); | |
6982 | pthread_mutex_unlock(&app->sock_lock); | |
6983 | ||
6984 | end_unlock: | |
6985 | pthread_mutex_unlock(&ua_sess->lock); | |
6986 | ||
6987 | end: | |
6988 | rcu_read_unlock(); | |
6989 | health_code_update(); | |
6990 | return ret; | |
6991 | } | |
6992 | ||
6993 | /* | |
6994 | * Regenerate the statedump for each app in the session. | |
6995 | */ | |
6996 | int ust_app_regenerate_statedump_all(struct ltt_ust_session *usess) | |
6997 | { | |
6998 | int ret = 0; | |
6999 | struct lttng_ht_iter iter; | |
7000 | struct ust_app *app; | |
7001 | ||
7002 | DBG("Regenerating the metadata for all UST apps"); | |
7003 | ||
7004 | rcu_read_lock(); | |
7005 | ||
7006 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
7007 | if (!app->compatible) { | |
7008 | continue; | |
7009 | } | |
7010 | ||
7011 | ret = ust_app_regenerate_statedump(usess, app); | |
7012 | if (ret < 0) { | |
7013 | /* Continue to the next app even on error */ | |
7014 | continue; | |
7015 | } | |
7016 | } | |
7017 | ||
7018 | rcu_read_unlock(); | |
7019 | ||
7020 | return 0; | |
7021 | } | |
5c408ad8 JD |
7022 | |
7023 | /* | |
7024 | * Rotate all the channels of a session. | |
7025 | * | |
6f6d3b69 | 7026 | * Return LTTNG_OK on success or else an LTTng error code. |
5c408ad8 | 7027 | */ |
6f6d3b69 | 7028 | enum lttng_error_code ust_app_rotate_session(struct ltt_session *session) |
5c408ad8 | 7029 | { |
6f6d3b69 MD |
7030 | int ret; |
7031 | enum lttng_error_code cmd_ret = LTTNG_OK; | |
5c408ad8 JD |
7032 | struct lttng_ht_iter iter; |
7033 | struct ust_app *app; | |
7034 | struct ltt_ust_session *usess = session->ust_session; | |
5c408ad8 JD |
7035 | |
7036 | assert(usess); | |
7037 | ||
7038 | rcu_read_lock(); | |
7039 | ||
7040 | switch (usess->buffer_type) { | |
7041 | case LTTNG_BUFFER_PER_UID: | |
7042 | { | |
7043 | struct buffer_reg_uid *reg; | |
7044 | ||
7045 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
7046 | struct buffer_reg_channel *reg_chan; | |
7047 | struct consumer_socket *socket; | |
7048 | ||
14d3fca9 JR |
7049 | if (!reg->registry->reg.ust->metadata_key) { |
7050 | /* Skip since no metadata is present */ | |
7051 | continue; | |
7052 | } | |
7053 | ||
5c408ad8 JD |
7054 | /* Get consumer socket to use to push the metadata.*/ |
7055 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
7056 | usess->consumer); | |
7057 | if (!socket) { | |
6f6d3b69 | 7058 | cmd_ret = LTTNG_ERR_INVALID; |
5c408ad8 JD |
7059 | goto error; |
7060 | } | |
7061 | ||
5c408ad8 JD |
7062 | /* Rotate the data channels. */ |
7063 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
7064 | reg_chan, node.node) { | |
5c408ad8 JD |
7065 | ret = consumer_rotate_channel(socket, |
7066 | reg_chan->consumer_key, | |
7067 | usess->uid, usess->gid, | |
d2956687 JG |
7068 | usess->consumer, |
7069 | /* is_metadata_channel */ false); | |
5c408ad8 | 7070 | if (ret < 0) { |
6f6d3b69 | 7071 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
7072 | goto error; |
7073 | } | |
7074 | } | |
7075 | ||
7076 | (void) push_metadata(reg->registry->reg.ust, usess->consumer); | |
7077 | ||
7078 | ret = consumer_rotate_channel(socket, | |
7079 | reg->registry->reg.ust->metadata_key, | |
7080 | usess->uid, usess->gid, | |
d2956687 JG |
7081 | usess->consumer, |
7082 | /* is_metadata_channel */ true); | |
5c408ad8 | 7083 | if (ret < 0) { |
6f6d3b69 | 7084 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
7085 | goto error; |
7086 | } | |
5c408ad8 JD |
7087 | } |
7088 | break; | |
7089 | } | |
7090 | case LTTNG_BUFFER_PER_PID: | |
7091 | { | |
7092 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
7093 | struct consumer_socket *socket; | |
7094 | struct lttng_ht_iter chan_iter; | |
7095 | struct ust_app_channel *ua_chan; | |
7096 | struct ust_app_session *ua_sess; | |
7097 | struct ust_registry_session *registry; | |
7098 | ||
7099 | ua_sess = lookup_session_by_app(usess, app); | |
7100 | if (!ua_sess) { | |
7101 | /* Session not associated with this app. */ | |
7102 | continue; | |
7103 | } | |
5c408ad8 JD |
7104 | |
7105 | /* Get the right consumer socket for the application. */ | |
7106 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
7107 | usess->consumer); | |
7108 | if (!socket) { | |
6f6d3b69 | 7109 | cmd_ret = LTTNG_ERR_INVALID; |
5c408ad8 JD |
7110 | goto error; |
7111 | } | |
7112 | ||
7113 | registry = get_session_registry(ua_sess); | |
7114 | if (!registry) { | |
6f6d3b69 MD |
7115 | DBG("Application session is being torn down. Skip application."); |
7116 | continue; | |
5c408ad8 JD |
7117 | } |
7118 | ||
5c408ad8 JD |
7119 | /* Rotate the data channels. */ |
7120 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
7121 | ua_chan, node.node) { | |
470cc211 JG |
7122 | ret = consumer_rotate_channel(socket, |
7123 | ua_chan->key, | |
ff588497 JR |
7124 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
7125 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
d2956687 JG |
7126 | ua_sess->consumer, |
7127 | /* is_metadata_channel */ false); | |
5c408ad8 | 7128 | if (ret < 0) { |
6f6d3b69 MD |
7129 | /* Per-PID buffer and application going away. */ |
7130 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) | |
7131 | continue; | |
7132 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; | |
5c408ad8 JD |
7133 | goto error; |
7134 | } | |
7135 | } | |
7136 | ||
7137 | /* Rotate the metadata channel. */ | |
7138 | (void) push_metadata(registry, usess->consumer); | |
470cc211 JG |
7139 | ret = consumer_rotate_channel(socket, |
7140 | registry->metadata_key, | |
ff588497 JR |
7141 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
7142 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
d2956687 JG |
7143 | ua_sess->consumer, |
7144 | /* is_metadata_channel */ true); | |
5c408ad8 | 7145 | if (ret < 0) { |
6f6d3b69 MD |
7146 | /* Per-PID buffer and application going away. */ |
7147 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) | |
7148 | continue; | |
7149 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; | |
5c408ad8 JD |
7150 | goto error; |
7151 | } | |
5c408ad8 JD |
7152 | } |
7153 | break; | |
7154 | } | |
7155 | default: | |
7156 | assert(0); | |
7157 | break; | |
7158 | } | |
7159 | ||
6f6d3b69 | 7160 | cmd_ret = LTTNG_OK; |
5c408ad8 JD |
7161 | |
7162 | error: | |
7163 | rcu_read_unlock(); | |
6f6d3b69 | 7164 | return cmd_ret; |
5c408ad8 | 7165 | } |
d2956687 JG |
7166 | |
7167 | enum lttng_error_code ust_app_create_channel_subdirectories( | |
7168 | const struct ltt_ust_session *usess) | |
7169 | { | |
7170 | enum lttng_error_code ret = LTTNG_OK; | |
7171 | struct lttng_ht_iter iter; | |
7172 | enum lttng_trace_chunk_status chunk_status; | |
7173 | char *pathname_index; | |
7174 | int fmt_ret; | |
7175 | ||
7176 | assert(usess->current_trace_chunk); | |
7177 | rcu_read_lock(); | |
7178 | ||
7179 | switch (usess->buffer_type) { | |
7180 | case LTTNG_BUFFER_PER_UID: | |
7181 | { | |
7182 | struct buffer_reg_uid *reg; | |
7183 | ||
7184 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
7185 | fmt_ret = asprintf(&pathname_index, | |
5da88b0f | 7186 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH "/" DEFAULT_INDEX_DIR, |
d2956687 JG |
7187 | reg->uid, reg->bits_per_long); |
7188 | if (fmt_ret < 0) { | |
7189 | ERR("Failed to format channel index directory"); | |
7190 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
7191 | goto error; | |
7192 | } | |
7193 | ||
7194 | /* | |
7195 | * Create the index subdirectory which will take care | |
7196 | * of implicitly creating the channel's path. | |
7197 | */ | |
7198 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
7199 | usess->current_trace_chunk, | |
7200 | pathname_index); | |
7201 | free(pathname_index); | |
7202 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
7203 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
7204 | goto error; | |
7205 | } | |
7206 | } | |
7207 | break; | |
7208 | } | |
7209 | case LTTNG_BUFFER_PER_PID: | |
7210 | { | |
7211 | struct ust_app *app; | |
7212 | ||
495dece5 MD |
7213 | /* |
7214 | * Create the toplevel ust/ directory in case no apps are running. | |
7215 | */ | |
7216 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
7217 | usess->current_trace_chunk, | |
7218 | DEFAULT_UST_TRACE_DIR); | |
7219 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
7220 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
7221 | goto error; | |
7222 | } | |
7223 | ||
d2956687 JG |
7224 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, |
7225 | pid_n.node) { | |
7226 | struct ust_app_session *ua_sess; | |
7227 | struct ust_registry_session *registry; | |
7228 | ||
7229 | ua_sess = lookup_session_by_app(usess, app); | |
7230 | if (!ua_sess) { | |
7231 | /* Session not associated with this app. */ | |
7232 | continue; | |
7233 | } | |
7234 | ||
7235 | registry = get_session_registry(ua_sess); | |
7236 | if (!registry) { | |
7237 | DBG("Application session is being torn down. Skip application."); | |
7238 | continue; | |
7239 | } | |
7240 | ||
7241 | fmt_ret = asprintf(&pathname_index, | |
5da88b0f | 7242 | DEFAULT_UST_TRACE_DIR "/%s/" DEFAULT_INDEX_DIR, |
d2956687 JG |
7243 | ua_sess->path); |
7244 | if (fmt_ret < 0) { | |
7245 | ERR("Failed to format channel index directory"); | |
7246 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
7247 | goto error; | |
7248 | } | |
7249 | /* | |
7250 | * Create the index subdirectory which will take care | |
7251 | * of implicitly creating the channel's path. | |
7252 | */ | |
7253 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
7254 | usess->current_trace_chunk, | |
7255 | pathname_index); | |
7256 | free(pathname_index); | |
7257 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
7258 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
7259 | goto error; | |
7260 | } | |
7261 | } | |
7262 | break; | |
7263 | } | |
7264 | default: | |
7265 | abort(); | |
7266 | } | |
7267 | ||
7268 | ret = LTTNG_OK; | |
7269 | error: | |
7270 | rcu_read_unlock(); | |
7271 | return ret; | |
7272 | } | |
4a9b9759 MD |
7273 | |
7274 | /* | |
7275 | * Clear all the channels of a session. | |
7276 | * | |
7277 | * Return LTTNG_OK on success or else an LTTng error code. | |
7278 | */ | |
7279 | enum lttng_error_code ust_app_clear_session(struct ltt_session *session) | |
7280 | { | |
7281 | int ret; | |
7282 | enum lttng_error_code cmd_ret = LTTNG_OK; | |
7283 | struct lttng_ht_iter iter; | |
7284 | struct ust_app *app; | |
7285 | struct ltt_ust_session *usess = session->ust_session; | |
7286 | ||
7287 | assert(usess); | |
7288 | ||
7289 | rcu_read_lock(); | |
7290 | ||
7291 | if (usess->active) { | |
7292 | ERR("Expecting inactive session %s (%" PRIu64 ")", session->name, session->id); | |
7293 | cmd_ret = LTTNG_ERR_FATAL; | |
7294 | goto end; | |
7295 | } | |
7296 | ||
7297 | switch (usess->buffer_type) { | |
7298 | case LTTNG_BUFFER_PER_UID: | |
7299 | { | |
7300 | struct buffer_reg_uid *reg; | |
7301 | ||
7302 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
7303 | struct buffer_reg_channel *reg_chan; | |
7304 | struct consumer_socket *socket; | |
7305 | ||
7306 | /* Get consumer socket to use to push the metadata.*/ | |
7307 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
7308 | usess->consumer); | |
7309 | if (!socket) { | |
7310 | cmd_ret = LTTNG_ERR_INVALID; | |
7311 | goto error_socket; | |
7312 | } | |
7313 | ||
7314 | /* Clear the data channels. */ | |
7315 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
7316 | reg_chan, node.node) { | |
7317 | ret = consumer_clear_channel(socket, | |
7318 | reg_chan->consumer_key); | |
7319 | if (ret < 0) { | |
7320 | goto error; | |
7321 | } | |
7322 | } | |
7323 | ||
7324 | (void) push_metadata(reg->registry->reg.ust, usess->consumer); | |
7325 | ||
7326 | /* | |
7327 | * Clear the metadata channel. | |
7328 | * Metadata channel is not cleared per se but we still need to | |
7329 | * perform a rotation operation on it behind the scene. | |
7330 | */ | |
7331 | ret = consumer_clear_channel(socket, | |
7332 | reg->registry->reg.ust->metadata_key); | |
7333 | if (ret < 0) { | |
7334 | goto error; | |
7335 | } | |
7336 | } | |
7337 | break; | |
7338 | } | |
7339 | case LTTNG_BUFFER_PER_PID: | |
7340 | { | |
7341 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
7342 | struct consumer_socket *socket; | |
7343 | struct lttng_ht_iter chan_iter; | |
7344 | struct ust_app_channel *ua_chan; | |
7345 | struct ust_app_session *ua_sess; | |
7346 | struct ust_registry_session *registry; | |
7347 | ||
7348 | ua_sess = lookup_session_by_app(usess, app); | |
7349 | if (!ua_sess) { | |
7350 | /* Session not associated with this app. */ | |
7351 | continue; | |
7352 | } | |
7353 | ||
7354 | /* Get the right consumer socket for the application. */ | |
7355 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
7356 | usess->consumer); | |
7357 | if (!socket) { | |
7358 | cmd_ret = LTTNG_ERR_INVALID; | |
7359 | goto error_socket; | |
7360 | } | |
7361 | ||
7362 | registry = get_session_registry(ua_sess); | |
7363 | if (!registry) { | |
7364 | DBG("Application session is being torn down. Skip application."); | |
7365 | continue; | |
7366 | } | |
7367 | ||
7368 | /* Clear the data channels. */ | |
7369 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
7370 | ua_chan, node.node) { | |
7371 | ret = consumer_clear_channel(socket, ua_chan->key); | |
7372 | if (ret < 0) { | |
7373 | /* Per-PID buffer and application going away. */ | |
7374 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) { | |
7375 | continue; | |
7376 | } | |
7377 | goto error; | |
7378 | } | |
7379 | } | |
7380 | ||
7381 | (void) push_metadata(registry, usess->consumer); | |
7382 | ||
7383 | /* | |
7384 | * Clear the metadata channel. | |
7385 | * Metadata channel is not cleared per se but we still need to | |
7386 | * perform rotation operation on it behind the scene. | |
7387 | */ | |
7388 | ret = consumer_clear_channel(socket, registry->metadata_key); | |
7389 | if (ret < 0) { | |
7390 | /* Per-PID buffer and application going away. */ | |
7391 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) { | |
7392 | continue; | |
7393 | } | |
7394 | goto error; | |
7395 | } | |
7396 | } | |
7397 | break; | |
7398 | } | |
7399 | default: | |
7400 | assert(0); | |
7401 | break; | |
7402 | } | |
7403 | ||
7404 | cmd_ret = LTTNG_OK; | |
7405 | goto end; | |
7406 | ||
7407 | error: | |
7408 | switch (-ret) { | |
7409 | case LTTCOMM_CONSUMERD_RELAYD_CLEAR_DISALLOWED: | |
7410 | cmd_ret = LTTNG_ERR_CLEAR_RELAY_DISALLOWED; | |
7411 | break; | |
7412 | default: | |
7413 | cmd_ret = LTTNG_ERR_CLEAR_FAIL_CONSUMER; | |
7414 | } | |
7415 | ||
7416 | error_socket: | |
7417 | end: | |
7418 | rcu_read_unlock(); | |
7419 | return cmd_ret; | |
7420 | } | |
04ed9e10 JG |
7421 | |
7422 | /* | |
7423 | * This function skips the metadata channel as the begin/end timestamps of a | |
7424 | * metadata packet are useless. | |
7425 | * | |
7426 | * Moreover, opening a packet after a "clear" will cause problems for live | |
7427 | * sessions as it will introduce padding that was not part of the first trace | |
7428 | * chunk. The relay daemon expects the content of the metadata stream of | |
7429 | * successive metadata trace chunks to be strict supersets of one another. | |
7430 | * | |
7431 | * For example, flushing a packet at the beginning of the metadata stream of | |
7432 | * a trace chunk resulting from a "clear" session command will cause the | |
7433 | * size of the metadata stream of the new trace chunk to not match the size of | |
7434 | * the metadata stream of the original chunk. This will confuse the relay | |
7435 | * daemon as the same "offset" in a metadata stream will no longer point | |
7436 | * to the same content. | |
7437 | */ | |
7438 | enum lttng_error_code ust_app_open_packets(struct ltt_session *session) | |
7439 | { | |
7440 | enum lttng_error_code ret = LTTNG_OK; | |
7441 | struct lttng_ht_iter iter; | |
7442 | struct ltt_ust_session *usess = session->ust_session; | |
7443 | ||
7444 | assert(usess); | |
7445 | ||
7446 | rcu_read_lock(); | |
7447 | ||
7448 | switch (usess->buffer_type) { | |
7449 | case LTTNG_BUFFER_PER_UID: | |
7450 | { | |
7451 | struct buffer_reg_uid *reg; | |
7452 | ||
7453 | cds_list_for_each_entry ( | |
7454 | reg, &usess->buffer_reg_uid_list, lnode) { | |
7455 | struct buffer_reg_channel *reg_chan; | |
7456 | struct consumer_socket *socket; | |
7457 | ||
7458 | socket = consumer_find_socket_by_bitness( | |
7459 | reg->bits_per_long, usess->consumer); | |
7460 | if (!socket) { | |
7461 | ret = LTTNG_ERR_FATAL; | |
7462 | goto error; | |
7463 | } | |
7464 | ||
7465 | cds_lfht_for_each_entry(reg->registry->channels->ht, | |
7466 | &iter.iter, reg_chan, node.node) { | |
7467 | const int open_ret = | |
7468 | consumer_open_channel_packets( | |
7469 | socket, | |
7470 | reg_chan->consumer_key); | |
7471 | ||
7472 | if (open_ret < 0) { | |
7473 | ret = LTTNG_ERR_UNK; | |
7474 | goto error; | |
7475 | } | |
7476 | } | |
7477 | } | |
7478 | break; | |
7479 | } | |
7480 | case LTTNG_BUFFER_PER_PID: | |
7481 | { | |
7482 | struct ust_app *app; | |
7483 | ||
7484 | cds_lfht_for_each_entry ( | |
7485 | ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
7486 | struct consumer_socket *socket; | |
7487 | struct lttng_ht_iter chan_iter; | |
7488 | struct ust_app_channel *ua_chan; | |
7489 | struct ust_app_session *ua_sess; | |
7490 | struct ust_registry_session *registry; | |
7491 | ||
7492 | ua_sess = lookup_session_by_app(usess, app); | |
7493 | if (!ua_sess) { | |
7494 | /* Session not associated with this app. */ | |
7495 | continue; | |
7496 | } | |
7497 | ||
7498 | /* Get the right consumer socket for the application. */ | |
7499 | socket = consumer_find_socket_by_bitness( | |
7500 | app->bits_per_long, usess->consumer); | |
7501 | if (!socket) { | |
7502 | ret = LTTNG_ERR_FATAL; | |
7503 | goto error; | |
7504 | } | |
7505 | ||
7506 | registry = get_session_registry(ua_sess); | |
7507 | if (!registry) { | |
7508 | DBG("Application session is being torn down. Skip application."); | |
7509 | continue; | |
7510 | } | |
7511 | ||
7512 | cds_lfht_for_each_entry(ua_sess->channels->ht, | |
7513 | &chan_iter.iter, ua_chan, node.node) { | |
7514 | const int open_ret = | |
7515 | consumer_open_channel_packets( | |
7516 | socket, | |
7517 | ua_chan->key); | |
7518 | ||
7519 | if (open_ret < 0) { | |
7520 | /* | |
7521 | * Per-PID buffer and application going | |
7522 | * away. | |
7523 | */ | |
97a171e1 | 7524 | if (open_ret == -LTTNG_ERR_CHAN_NOT_FOUND) { |
04ed9e10 JG |
7525 | continue; |
7526 | } | |
7527 | ||
7528 | ret = LTTNG_ERR_UNK; | |
7529 | goto error; | |
7530 | } | |
7531 | } | |
7532 | } | |
7533 | break; | |
7534 | } | |
7535 | default: | |
7536 | abort(); | |
7537 | break; | |
7538 | } | |
7539 | ||
7540 | error: | |
7541 | rcu_read_unlock(); | |
7542 | return ret; | |
7543 | } |