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, | |
fc4b93fa | 91 | struct lttng_ust_abi_channel_attr *uattr) |
d65d2de8 DG |
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) { |
fc4b93fa | 131 | if (event->attr.loglevel_type == LTTNG_UST_ABI_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, | |
fc4b93fa | 168 | event->exclusion->count * LTTNG_UST_ABI_SYM_NAME_LEN) != 0) { |
1af53eb5 JI |
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 | ||
fc4b93fa | 443 | if (ua_chan->attr.type != LTTNG_UST_ABI_CHAN_PER_CPU) { |
fb83fe64 JD |
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 | ||
fc4b93fa | 583 | int ust_app_release_object(struct ust_app *app, struct lttng_ust_abi_object_data *data) |
fb45065e MD |
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); |
fc4b93fa | 1112 | ua_sess->metadata_attr.type = LTTNG_UST_ABI_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, |
fc4b93fa | 1127 | struct lttng_ust_abi_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 | 1164 | /* By default, the channel is a per cpu channel. */ |
fc4b93fa | 1165 | ua_chan->attr.type = LTTNG_UST_ABI_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, | |
fc4b93fa | 1202 | struct lttng_ust_abi_event *attr) |
8b366481 DG |
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)); | |
fc4b93fa | 1307 | if (uctx->ctx == LTTNG_UST_ABI_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 | */ | |
fc4b93fa MD |
1335 | static struct lttng_ust_abi_filter_bytecode *create_ust_filter_bytecode_from_bytecode( |
1336 | const struct lttng_bytecode *orig_f) | |
51755dc8 | 1337 | { |
fc4b93fa | 1338 | struct lttng_ust_abi_filter_bytecode *filter = NULL; |
51755dc8 | 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) == |
fc4b93fa | 1348 | sizeof(struct lttng_ust_abi_filter_bytecode)); |
51755dc8 JG |
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 | */ | |
fc4b93fa | 1359 | static struct lttng_ust_abi_capture_bytecode * |
f2eafd2d JR |
1360 | create_ust_capture_bytecode_from_bytecode(const struct lttng_bytecode *orig_f) |
1361 | { | |
fc4b93fa | 1362 | struct lttng_ust_abi_capture_bytecode *capture = NULL; |
f2eafd2d JR |
1363 | |
1364 | /* Copy capture bytecode. */ | |
1365 | capture = zmalloc(sizeof(*capture) + orig_f->len); | |
1366 | if (!capture) { | |
fc4b93fa | 1367 | PERROR("Failed to allocate lttng_ust_abi_capture_bytecode: bytecode len = %" PRIu32 " bytes", orig_f->len); |
f2eafd2d JR |
1368 | goto error; |
1369 | } | |
1370 | ||
1371 | assert(sizeof(struct lttng_bytecode) == | |
fc4b93fa | 1372 | sizeof(struct lttng_ust_abi_capture_bytecode)); |
f2eafd2d JR |
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, |
fc4b93fa | 1540 | struct lttng_ust_abi_object_data *ust_object) |
53a80697 MD |
1541 | { |
1542 | int ret; | |
fc4b93fa | 1543 | struct lttng_ust_abi_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. | |
11f6ce94 JR |
1582 | * The sequence number enforces the ordering at runtime and on reception of |
1583 | * the captured payloads. | |
f2eafd2d JR |
1584 | */ |
1585 | static int set_ust_capture(struct ust_app *app, | |
1586 | const struct lttng_bytecode *bytecode, | |
11f6ce94 | 1587 | unsigned int capture_seqnum, |
3d1384a4 | 1588 | struct lttng_ust_abi_object_data *ust_object) |
f2eafd2d JR |
1589 | { |
1590 | int ret; | |
fc4b93fa | 1591 | struct lttng_ust_abi_capture_bytecode *ust_bytecode = NULL; |
f2eafd2d JR |
1592 | |
1593 | health_code_update(); | |
1594 | ||
1595 | ust_bytecode = create_ust_capture_bytecode_from_bytecode(bytecode); | |
1596 | if (!ust_bytecode) { | |
1597 | ret = -LTTNG_ERR_NOMEM; | |
1598 | goto error; | |
1599 | } | |
1600 | ||
11f6ce94 JR |
1601 | /* |
1602 | * Set the sequence number to ensure the capture of fields is ordered. | |
1603 | */ | |
1604 | ust_bytecode->seqnum = capture_seqnum; | |
1605 | ||
f2eafd2d JR |
1606 | pthread_mutex_lock(&app->sock_lock); |
1607 | ret = ustctl_set_capture(app->sock, ust_bytecode, | |
1608 | ust_object); | |
1609 | pthread_mutex_unlock(&app->sock_lock); | |
1610 | if (ret < 0) { | |
1611 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1612 | ERR("UST app set object capture failed: object = %p of app pid = %d, ret = %d", | |
1613 | ust_object, app->pid, ret); | |
1614 | } else { | |
1615 | /* | |
1616 | * This is normal behavior, an application can die during the | |
1617 | * creation process. Don't report an error so the execution can | |
1618 | * continue normally. | |
1619 | */ | |
1620 | ret = 0; | |
1621 | DBG3("Failed to set UST app object capture. Application is dead."); | |
1622 | } | |
1623 | ||
1624 | goto error; | |
1625 | } | |
1626 | ||
1627 | DBG2("UST capture successfully set: object = %p", ust_object); | |
53a80697 MD |
1628 | |
1629 | error: | |
840cb59c | 1630 | health_code_update(); |
51755dc8 | 1631 | free(ust_bytecode); |
53a80697 MD |
1632 | return ret; |
1633 | } | |
1634 | ||
51755dc8 | 1635 | static |
fc4b93fa | 1636 | struct lttng_ust_abi_event_exclusion *create_ust_exclusion_from_exclusion( |
c0901ffa | 1637 | const struct lttng_event_exclusion *exclusion) |
51755dc8 | 1638 | { |
fc4b93fa MD |
1639 | struct lttng_ust_abi_event_exclusion *ust_exclusion = NULL; |
1640 | size_t exclusion_alloc_size = sizeof(struct lttng_ust_abi_event_exclusion) + | |
1641 | LTTNG_UST_ABI_SYM_NAME_LEN * exclusion->count; | |
51755dc8 JG |
1642 | |
1643 | ust_exclusion = zmalloc(exclusion_alloc_size); | |
1644 | if (!ust_exclusion) { | |
1645 | PERROR("malloc"); | |
1646 | goto end; | |
1647 | } | |
1648 | ||
1649 | assert(sizeof(struct lttng_event_exclusion) == | |
fc4b93fa | 1650 | sizeof(struct lttng_ust_abi_event_exclusion)); |
51755dc8 JG |
1651 | memcpy(ust_exclusion, exclusion, exclusion_alloc_size); |
1652 | end: | |
1653 | return ust_exclusion; | |
1654 | } | |
1655 | ||
7cc9a73c JI |
1656 | /* |
1657 | * Set event exclusions on the tracer. | |
1658 | */ | |
c0901ffa JR |
1659 | static int set_ust_object_exclusions(struct ust_app *app, |
1660 | const struct lttng_event_exclusion *exclusions, | |
fc4b93fa | 1661 | struct lttng_ust_abi_object_data *ust_object) |
7cc9a73c JI |
1662 | { |
1663 | int ret; | |
fc4b93fa | 1664 | struct lttng_ust_abi_event_exclusion *ust_exclusions = NULL; |
7cc9a73c | 1665 | |
c0901ffa | 1666 | assert(exclusions && exclusions->count > 0); |
7cc9a73c | 1667 | |
c0901ffa | 1668 | health_code_update(); |
7cc9a73c | 1669 | |
c0901ffa JR |
1670 | ust_exclusions = create_ust_exclusion_from_exclusion( |
1671 | exclusions); | |
1672 | if (!ust_exclusions) { | |
51755dc8 JG |
1673 | ret = -LTTNG_ERR_NOMEM; |
1674 | goto error; | |
1675 | } | |
fb45065e | 1676 | pthread_mutex_lock(&app->sock_lock); |
c0901ffa | 1677 | ret = ustctl_set_exclusion(app->sock, ust_exclusions, ust_object); |
fb45065e | 1678 | pthread_mutex_unlock(&app->sock_lock); |
7cc9a73c JI |
1679 | if (ret < 0) { |
1680 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
c0901ffa JR |
1681 | ERR("Failed to set UST app exclusions for object %p of app (pid: %d) " |
1682 | "with ret %d", ust_object, app->pid, ret); | |
7cc9a73c JI |
1683 | } else { |
1684 | /* | |
1685 | * This is normal behavior, an application can die during the | |
1686 | * creation process. Don't report an error so the execution can | |
1687 | * continue normally. | |
1688 | */ | |
1689 | ret = 0; | |
c0901ffa | 1690 | DBG3("Failed to set UST app object exclusions. Application is dead."); |
7cc9a73c JI |
1691 | } |
1692 | goto error; | |
1693 | } | |
1694 | ||
c0901ffa | 1695 | DBG2("UST exclusions set successfully for object %p", ust_object); |
7cc9a73c JI |
1696 | |
1697 | error: | |
1698 | health_code_update(); | |
c0901ffa | 1699 | free(ust_exclusions); |
7cc9a73c JI |
1700 | return ret; |
1701 | } | |
1702 | ||
9730260e DG |
1703 | /* |
1704 | * Disable the specified event on to UST tracer for the UST session. | |
1705 | */ | |
e2456d0a | 1706 | static int disable_ust_object(struct ust_app *app, |
fc4b93fa | 1707 | struct lttng_ust_abi_object_data *object) |
9730260e DG |
1708 | { |
1709 | int ret; | |
1710 | ||
840cb59c | 1711 | health_code_update(); |
86acf0da | 1712 | |
fb45065e | 1713 | pthread_mutex_lock(&app->sock_lock); |
e2456d0a | 1714 | ret = ustctl_disable(app->sock, object); |
fb45065e | 1715 | pthread_mutex_unlock(&app->sock_lock); |
9730260e | 1716 | if (ret < 0) { |
ffe60014 | 1717 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
e2456d0a JR |
1718 | ERR("Failed to disable UST app object %p app (pid: %d) with ret %d", |
1719 | object, app->pid, ret); | |
ffe60014 | 1720 | } else { |
3757b385 DG |
1721 | /* |
1722 | * This is normal behavior, an application can die during the | |
1723 | * creation process. Don't report an error so the execution can | |
1724 | * continue normally. | |
1725 | */ | |
1726 | ret = 0; | |
e2456d0a | 1727 | DBG3("Failed to disable UST app object. Application is dead."); |
ffe60014 | 1728 | } |
9730260e DG |
1729 | goto error; |
1730 | } | |
1731 | ||
e2456d0a JR |
1732 | DBG2("UST app object %p disabled successfully for app (pid: %d)", |
1733 | object, app->pid); | |
9730260e DG |
1734 | |
1735 | error: | |
840cb59c | 1736 | health_code_update(); |
9730260e DG |
1737 | return ret; |
1738 | } | |
1739 | ||
78f0bacd DG |
1740 | /* |
1741 | * Disable the specified channel on to UST tracer for the UST session. | |
1742 | */ | |
1743 | static int disable_ust_channel(struct ust_app *app, | |
1744 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1745 | { | |
1746 | int ret; | |
1747 | ||
840cb59c | 1748 | health_code_update(); |
86acf0da | 1749 | |
fb45065e | 1750 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1751 | ret = ustctl_disable(app->sock, ua_chan->obj); |
fb45065e | 1752 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1753 | if (ret < 0) { |
ffe60014 DG |
1754 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1755 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1756 | "and session handle %d with ret %d", | |
1757 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1758 | } else { | |
3757b385 DG |
1759 | /* |
1760 | * This is normal behavior, an application can die during the | |
1761 | * creation process. Don't report an error so the execution can | |
1762 | * continue normally. | |
1763 | */ | |
1764 | ret = 0; | |
ffe60014 DG |
1765 | DBG3("UST app disable channel failed. Application is dead."); |
1766 | } | |
78f0bacd DG |
1767 | goto error; |
1768 | } | |
1769 | ||
78f0bacd | 1770 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1771 | ua_chan->name, app->pid); |
78f0bacd DG |
1772 | |
1773 | error: | |
840cb59c | 1774 | health_code_update(); |
78f0bacd DG |
1775 | return ret; |
1776 | } | |
1777 | ||
1778 | /* | |
1779 | * Enable the specified channel on to UST tracer for the UST session. | |
1780 | */ | |
1781 | static int enable_ust_channel(struct ust_app *app, | |
1782 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1783 | { | |
1784 | int ret; | |
1785 | ||
840cb59c | 1786 | health_code_update(); |
86acf0da | 1787 | |
fb45065e | 1788 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1789 | ret = ustctl_enable(app->sock, ua_chan->obj); |
fb45065e | 1790 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1791 | if (ret < 0) { |
ffe60014 DG |
1792 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1793 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1794 | "and session handle %d with ret %d", | |
1795 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1796 | } else { | |
3757b385 DG |
1797 | /* |
1798 | * This is normal behavior, an application can die during the | |
1799 | * creation process. Don't report an error so the execution can | |
1800 | * continue normally. | |
1801 | */ | |
1802 | ret = 0; | |
ffe60014 DG |
1803 | DBG3("UST app enable channel failed. Application is dead."); |
1804 | } | |
78f0bacd DG |
1805 | goto error; |
1806 | } | |
1807 | ||
1808 | ua_chan->enabled = 1; | |
1809 | ||
1810 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1811 | ua_chan->name, app->pid); |
78f0bacd DG |
1812 | |
1813 | error: | |
840cb59c | 1814 | health_code_update(); |
78f0bacd DG |
1815 | return ret; |
1816 | } | |
1817 | ||
edb67388 DG |
1818 | /* |
1819 | * Enable the specified event on to UST tracer for the UST session. | |
1820 | */ | |
3428a1b7 | 1821 | static int enable_ust_object( |
fc4b93fa | 1822 | struct ust_app *app, struct lttng_ust_abi_object_data *ust_object) |
edb67388 DG |
1823 | { |
1824 | int ret; | |
1825 | ||
840cb59c | 1826 | health_code_update(); |
86acf0da | 1827 | |
fb45065e | 1828 | pthread_mutex_lock(&app->sock_lock); |
3428a1b7 | 1829 | ret = ustctl_enable(app->sock, ust_object); |
fb45065e | 1830 | pthread_mutex_unlock(&app->sock_lock); |
edb67388 | 1831 | if (ret < 0) { |
ffe60014 | 1832 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3428a1b7 JR |
1833 | ERR("UST app enable failed for object %p app (pid: %d) with ret %d", |
1834 | ust_object, app->pid, ret); | |
ffe60014 | 1835 | } else { |
3757b385 DG |
1836 | /* |
1837 | * This is normal behavior, an application can die during the | |
1838 | * creation process. Don't report an error so the execution can | |
1839 | * continue normally. | |
1840 | */ | |
1841 | ret = 0; | |
3428a1b7 | 1842 | DBG3("Failed to enable UST app object. Application is dead."); |
ffe60014 | 1843 | } |
edb67388 DG |
1844 | goto error; |
1845 | } | |
1846 | ||
3428a1b7 JR |
1847 | DBG2("UST app object %p enabled successfully for app (pid: %d)", |
1848 | ust_object, app->pid); | |
edb67388 DG |
1849 | |
1850 | error: | |
840cb59c | 1851 | health_code_update(); |
edb67388 DG |
1852 | return ret; |
1853 | } | |
1854 | ||
099e26bd | 1855 | /* |
7972aab2 | 1856 | * Send channel and stream buffer to application. |
4f3ab6ee | 1857 | * |
ffe60014 | 1858 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1859 | */ |
7972aab2 DG |
1860 | static int send_channel_pid_to_ust(struct ust_app *app, |
1861 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1862 | { |
1863 | int ret; | |
ffe60014 | 1864 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1865 | |
1866 | assert(app); | |
ffe60014 | 1867 | assert(ua_sess); |
4f3ab6ee | 1868 | assert(ua_chan); |
4f3ab6ee | 1869 | |
840cb59c | 1870 | health_code_update(); |
4f3ab6ee | 1871 | |
7972aab2 DG |
1872 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1873 | app->sock); | |
86acf0da | 1874 | |
ffe60014 DG |
1875 | /* Send channel to the application. */ |
1876 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
1877 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1878 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1879 | goto error; | |
1880 | } else if (ret < 0) { | |
b551a063 DG |
1881 | goto error; |
1882 | } | |
1883 | ||
d88aee68 DG |
1884 | health_code_update(); |
1885 | ||
ffe60014 DG |
1886 | /* Send all streams to application. */ |
1887 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1888 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
a7169585 MD |
1889 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1890 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1891 | goto error; | |
1892 | } else if (ret < 0) { | |
ffe60014 DG |
1893 | goto error; |
1894 | } | |
1895 | /* We don't need the stream anymore once sent to the tracer. */ | |
1896 | cds_list_del(&stream->list); | |
fb45065e | 1897 | delete_ust_app_stream(-1, stream, app); |
ffe60014 | 1898 | } |
ffe60014 DG |
1899 | /* Flag the channel that it is sent to the application. */ |
1900 | ua_chan->is_sent = 1; | |
ffe60014 | 1901 | |
b551a063 | 1902 | error: |
840cb59c | 1903 | health_code_update(); |
b551a063 DG |
1904 | return ret; |
1905 | } | |
1906 | ||
91d76f53 | 1907 | /* |
5b4a0ec0 | 1908 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1909 | * |
1910 | * Should be called with session mutex held. | |
91d76f53 | 1911 | */ |
edb67388 DG |
1912 | static |
1913 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1914 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1915 | { |
5b4a0ec0 | 1916 | int ret = 0; |
284d8f55 | 1917 | |
840cb59c | 1918 | health_code_update(); |
86acf0da | 1919 | |
5b4a0ec0 | 1920 | /* Create UST event on tracer */ |
fb45065e | 1921 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1922 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 | 1923 | &ua_event->obj); |
fb45065e | 1924 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 | 1925 | if (ret < 0) { |
ffe60014 | 1926 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
88e3c2f5 | 1927 | abort(); |
ffe60014 DG |
1928 | ERR("Error ustctl create event %s for app pid: %d with ret %d", |
1929 | ua_event->attr.name, app->pid, ret); | |
1930 | } else { | |
3757b385 DG |
1931 | /* |
1932 | * This is normal behavior, an application can die during the | |
1933 | * creation process. Don't report an error so the execution can | |
1934 | * continue normally. | |
1935 | */ | |
1936 | ret = 0; | |
ffe60014 DG |
1937 | DBG3("UST app create event failed. Application is dead."); |
1938 | } | |
5b4a0ec0 | 1939 | goto error; |
91d76f53 | 1940 | } |
f6a9efaa | 1941 | |
5b4a0ec0 | 1942 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1943 | |
3428a1b7 JR |
1944 | DBG2("UST app event %s created successfully for pid:%d object: %p", |
1945 | ua_event->attr.name, app->pid, ua_event->obj); | |
f6a9efaa | 1946 | |
840cb59c | 1947 | health_code_update(); |
86acf0da | 1948 | |
025faf73 DG |
1949 | /* Set filter if one is present. */ |
1950 | if (ua_event->filter) { | |
a154c7b8 | 1951 | ret = set_ust_object_filter(app, ua_event->filter, ua_event->obj); |
025faf73 DG |
1952 | if (ret < 0) { |
1953 | goto error; | |
1954 | } | |
1955 | } | |
1956 | ||
7cc9a73c JI |
1957 | /* Set exclusions for the event */ |
1958 | if (ua_event->exclusion) { | |
c0901ffa | 1959 | ret = set_ust_object_exclusions(app, ua_event->exclusion, ua_event->obj); |
7cc9a73c JI |
1960 | if (ret < 0) { |
1961 | goto error; | |
1962 | } | |
1963 | } | |
1964 | ||
8535a6d9 | 1965 | /* If event not enabled, disable it on the tracer */ |
40113787 MD |
1966 | if (ua_event->enabled) { |
1967 | /* | |
1968 | * We now need to explicitly enable the event, since it | |
1969 | * is now disabled at creation. | |
1970 | */ | |
3428a1b7 | 1971 | ret = enable_ust_object(app, ua_event->obj); |
40113787 MD |
1972 | if (ret < 0) { |
1973 | /* | |
1974 | * If we hit an EPERM, something is wrong with our enable call. If | |
1975 | * we get an EEXIST, there is a problem on the tracer side since we | |
1976 | * just created it. | |
1977 | */ | |
1978 | switch (ret) { | |
1979 | case -LTTNG_UST_ERR_PERM: | |
1980 | /* Code flow problem */ | |
1981 | assert(0); | |
1982 | case -LTTNG_UST_ERR_EXIST: | |
1983 | /* It's OK for our use case. */ | |
1984 | ret = 0; | |
1985 | break; | |
1986 | default: | |
1987 | break; | |
1988 | } | |
1989 | goto error; | |
1990 | } | |
8535a6d9 DG |
1991 | } |
1992 | ||
5b4a0ec0 | 1993 | error: |
840cb59c | 1994 | health_code_update(); |
5b4a0ec0 | 1995 | return ret; |
91d76f53 | 1996 | } |
48842b30 | 1997 | |
993578ff JR |
1998 | static int init_ust_event_notifier_from_event_rule( |
1999 | const struct lttng_event_rule *rule, | |
fc4b93fa | 2000 | struct lttng_ust_abi_event_notifier *event_notifier) |
993578ff JR |
2001 | { |
2002 | enum lttng_event_rule_status status; | |
2003 | enum lttng_loglevel_type loglevel_type; | |
fc4b93fa | 2004 | enum lttng_ust_abi_loglevel_type ust_loglevel_type = LTTNG_UST_ABI_LOGLEVEL_ALL; |
993578ff JR |
2005 | int loglevel = -1, ret = 0; |
2006 | const char *pattern; | |
2007 | ||
2008 | /* For now only LTTNG_EVENT_RULE_TYPE_TRACEPOINT are supported. */ | |
2009 | assert(lttng_event_rule_get_type(rule) == | |
2010 | LTTNG_EVENT_RULE_TYPE_TRACEPOINT); | |
2011 | ||
2012 | memset(event_notifier, 0, sizeof(*event_notifier)); | |
2013 | ||
44760c20 JR |
2014 | if (lttng_event_rule_targets_agent_domain(rule)) { |
2015 | /* | |
2016 | * Special event for agents | |
2017 | * The actual meat of the event is in the filter that will be | |
2018 | * attached later on. | |
2019 | * Set the default values for the agent event. | |
2020 | */ | |
2021 | pattern = event_get_default_agent_ust_name( | |
2022 | lttng_event_rule_get_domain_type(rule)); | |
2023 | loglevel = 0; | |
fc4b93fa | 2024 | ust_loglevel_type = LTTNG_UST_ABI_LOGLEVEL_ALL; |
44760c20 JR |
2025 | } else { |
2026 | status = lttng_event_rule_tracepoint_get_pattern( | |
2027 | rule, &pattern); | |
2028 | if (status != LTTNG_EVENT_RULE_STATUS_OK) { | |
2029 | /* At this point, this is a fatal error. */ | |
2030 | abort(); | |
2031 | } | |
993578ff | 2032 | |
44760c20 JR |
2033 | status = lttng_event_rule_tracepoint_get_log_level_type( |
2034 | rule, &loglevel_type); | |
2035 | if (status != LTTNG_EVENT_RULE_STATUS_OK) { | |
2036 | /* At this point, this is a fatal error. */ | |
2037 | abort(); | |
2038 | } | |
993578ff | 2039 | |
44760c20 JR |
2040 | switch (loglevel_type) { |
2041 | case LTTNG_EVENT_LOGLEVEL_ALL: | |
fc4b93fa | 2042 | ust_loglevel_type = LTTNG_UST_ABI_LOGLEVEL_ALL; |
44760c20 JR |
2043 | break; |
2044 | case LTTNG_EVENT_LOGLEVEL_RANGE: | |
fc4b93fa | 2045 | ust_loglevel_type = LTTNG_UST_ABI_LOGLEVEL_RANGE; |
44760c20 JR |
2046 | break; |
2047 | case LTTNG_EVENT_LOGLEVEL_SINGLE: | |
fc4b93fa | 2048 | ust_loglevel_type = LTTNG_UST_ABI_LOGLEVEL_SINGLE; |
44760c20 JR |
2049 | break; |
2050 | default: | |
2051 | /* Unknown log level specification type. */ | |
2052 | abort(); | |
2053 | } | |
993578ff | 2054 | |
44760c20 JR |
2055 | if (loglevel_type != LTTNG_EVENT_LOGLEVEL_ALL) { |
2056 | status = lttng_event_rule_tracepoint_get_log_level( | |
2057 | rule, &loglevel); | |
2058 | assert(status == LTTNG_EVENT_RULE_STATUS_OK); | |
2059 | } | |
993578ff JR |
2060 | } |
2061 | ||
fc4b93fa | 2062 | event_notifier->event.instrumentation = LTTNG_UST_ABI_TRACEPOINT; |
993578ff | 2063 | ret = lttng_strncpy(event_notifier->event.name, pattern, |
fc4b93fa | 2064 | LTTNG_UST_ABI_SYM_NAME_LEN - 1); |
993578ff JR |
2065 | if (ret) { |
2066 | ERR("Failed to copy event rule pattern to notifier: pattern = '%s' ", | |
2067 | pattern); | |
2068 | goto end; | |
2069 | } | |
2070 | ||
2071 | event_notifier->event.loglevel_type = ust_loglevel_type; | |
2072 | event_notifier->event.loglevel = loglevel; | |
2073 | end: | |
2074 | return ret; | |
2075 | } | |
2076 | ||
2077 | /* | |
2078 | * Create the specified event notifier against the user space tracer of a | |
2079 | * given application. | |
2080 | */ | |
2081 | static int create_ust_event_notifier(struct ust_app *app, | |
2082 | struct ust_app_event_notifier_rule *ua_event_notifier_rule) | |
2083 | { | |
2084 | int ret = 0; | |
267d66aa JR |
2085 | enum lttng_condition_status condition_status; |
2086 | const struct lttng_condition *condition = NULL; | |
fc4b93fa | 2087 | struct lttng_ust_abi_event_notifier event_notifier; |
267d66aa | 2088 | const struct lttng_event_rule *event_rule = NULL; |
f83be61d JR |
2089 | unsigned int capture_bytecode_count = 0, i; |
2090 | enum lttng_condition_status cond_status; | |
993578ff JR |
2091 | |
2092 | health_code_update(); | |
2093 | assert(app->event_notifier_group.object); | |
2094 | ||
267d66aa JR |
2095 | condition = lttng_trigger_get_const_condition( |
2096 | ua_event_notifier_rule->trigger); | |
2097 | assert(condition); | |
2098 | assert(lttng_condition_get_type(condition) == LTTNG_CONDITION_TYPE_EVENT_RULE_HIT); | |
993578ff | 2099 | |
267d66aa JR |
2100 | condition_status = lttng_condition_event_rule_get_rule(condition, &event_rule); |
2101 | assert(condition_status == LTTNG_CONDITION_STATUS_OK); | |
2102 | assert(event_rule); | |
2103 | assert(lttng_event_rule_get_type(event_rule) == LTTNG_EVENT_RULE_TYPE_TRACEPOINT); | |
2104 | ||
2105 | init_ust_event_notifier_from_event_rule(event_rule, &event_notifier); | |
993578ff JR |
2106 | event_notifier.event.token = ua_event_notifier_rule->token; |
2107 | ||
2108 | /* Create UST event notifier against the tracer. */ | |
2109 | pthread_mutex_lock(&app->sock_lock); | |
2110 | ret = ustctl_create_event_notifier(app->sock, &event_notifier, | |
2111 | app->event_notifier_group.object, | |
2112 | &ua_event_notifier_rule->obj); | |
2113 | pthread_mutex_unlock(&app->sock_lock); | |
2114 | if (ret < 0) { | |
2115 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
2116 | ERR("Error ustctl create event notifier: name = '%s', app = '%s' (ppid: %d), ret = %d", | |
2117 | event_notifier.event.name, app->name, | |
2118 | app->ppid, ret); | |
2119 | } else { | |
2120 | /* | |
2121 | * This is normal behavior, an application can die | |
2122 | * during the creation process. Don't report an error so | |
2123 | * the execution can continue normally. | |
2124 | */ | |
2125 | ret = 0; | |
2126 | DBG3("UST app create event notifier failed (application is dead): app = '%s' (ppid = %d)", | |
2127 | app->name, app->ppid); | |
2128 | } | |
2129 | ||
2130 | goto error; | |
2131 | } | |
2132 | ||
2133 | ua_event_notifier_rule->handle = ua_event_notifier_rule->obj->handle; | |
2134 | ||
2135 | DBG2("UST app event notifier %s created successfully: app = '%s' (ppid: %d), object: %p", | |
2136 | event_notifier.event.name, app->name, app->ppid, | |
2137 | ua_event_notifier_rule->obj); | |
2138 | ||
2139 | health_code_update(); | |
2140 | ||
2141 | /* Set filter if one is present. */ | |
2142 | if (ua_event_notifier_rule->filter) { | |
2143 | ret = set_ust_object_filter(app, ua_event_notifier_rule->filter, | |
2144 | ua_event_notifier_rule->obj); | |
2145 | if (ret < 0) { | |
2146 | goto error; | |
2147 | } | |
2148 | } | |
2149 | ||
2150 | /* Set exclusions for the event. */ | |
2151 | if (ua_event_notifier_rule->exclusion) { | |
2152 | ret = set_ust_object_exclusions(app, | |
2153 | ua_event_notifier_rule->exclusion, | |
2154 | ua_event_notifier_rule->obj); | |
2155 | if (ret < 0) { | |
2156 | goto error; | |
2157 | } | |
2158 | } | |
f83be61d JR |
2159 | |
2160 | /* Set the capture bytecodes. */ | |
2161 | cond_status = lttng_condition_event_rule_get_capture_descriptor_count( | |
2162 | condition, &capture_bytecode_count); | |
2163 | assert(cond_status == LTTNG_CONDITION_STATUS_OK); | |
2164 | ||
2165 | for (i = 0; i < capture_bytecode_count; i++) { | |
2166 | const struct lttng_bytecode *capture_bytecode = | |
2167 | lttng_condition_event_rule_get_capture_bytecode_at_index( | |
2168 | condition, i); | |
2169 | ||
11f6ce94 | 2170 | ret = set_ust_capture(app, capture_bytecode, i, |
f83be61d JR |
2171 | ua_event_notifier_rule->obj); |
2172 | if (ret < 0) { | |
2173 | goto error; | |
2174 | } | |
2175 | } | |
993578ff JR |
2176 | |
2177 | /* | |
2178 | * We now need to explicitly enable the event, since it | |
2179 | * is disabled at creation. | |
2180 | */ | |
2181 | ret = enable_ust_object(app, ua_event_notifier_rule->obj); | |
2182 | if (ret < 0) { | |
2183 | /* | |
2184 | * If we hit an EPERM, something is wrong with our enable call. | |
2185 | * If we get an EEXIST, there is a problem on the tracer side | |
2186 | * since we just created it. | |
2187 | */ | |
2188 | switch (ret) { | |
2189 | case -LTTNG_UST_ERR_PERM: | |
2190 | /* Code flow problem. */ | |
2191 | abort(); | |
2192 | case -LTTNG_UST_ERR_EXIST: | |
2193 | /* It's OK for our use case. */ | |
2194 | ret = 0; | |
2195 | break; | |
2196 | default: | |
2197 | break; | |
2198 | } | |
2199 | ||
2200 | goto error; | |
2201 | } | |
2202 | ||
2203 | ua_event_notifier_rule->enabled = true; | |
2204 | ||
2205 | error: | |
2206 | health_code_update(); | |
2207 | return ret; | |
2208 | } | |
2209 | ||
5b4a0ec0 DG |
2210 | /* |
2211 | * Copy data between an UST app event and a LTT event. | |
2212 | */ | |
421cb601 | 2213 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
2214 | struct ltt_ust_event *uevent) |
2215 | { | |
b4ffad32 JI |
2216 | size_t exclusion_alloc_size; |
2217 | ||
48842b30 DG |
2218 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); |
2219 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
2220 | ||
fc34caaa DG |
2221 | ua_event->enabled = uevent->enabled; |
2222 | ||
5b4a0ec0 DG |
2223 | /* Copy event attributes */ |
2224 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
2225 | ||
53a80697 MD |
2226 | /* Copy filter bytecode */ |
2227 | if (uevent->filter) { | |
2b00d462 | 2228 | ua_event->filter = lttng_bytecode_copy(uevent->filter); |
025faf73 | 2229 | /* Filter might be NULL here in case of ENONEM. */ |
53a80697 | 2230 | } |
b4ffad32 JI |
2231 | |
2232 | /* Copy exclusion data */ | |
2233 | if (uevent->exclusion) { | |
51755dc8 | 2234 | exclusion_alloc_size = sizeof(struct lttng_event_exclusion) + |
fc4b93fa | 2235 | LTTNG_UST_ABI_SYM_NAME_LEN * uevent->exclusion->count; |
b4ffad32 | 2236 | ua_event->exclusion = zmalloc(exclusion_alloc_size); |
5f8df26c JI |
2237 | if (ua_event->exclusion == NULL) { |
2238 | PERROR("malloc"); | |
2239 | } else { | |
2240 | memcpy(ua_event->exclusion, uevent->exclusion, | |
2241 | exclusion_alloc_size); | |
b4ffad32 JI |
2242 | } |
2243 | } | |
48842b30 DG |
2244 | } |
2245 | ||
5b4a0ec0 DG |
2246 | /* |
2247 | * Copy data between an UST app channel and a LTT channel. | |
2248 | */ | |
421cb601 | 2249 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
2250 | struct ltt_ust_channel *uchan) |
2251 | { | |
fc34caaa | 2252 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
2253 | |
2254 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
2255 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 2256 | |
1624d5b7 JD |
2257 | ua_chan->tracefile_size = uchan->tracefile_size; |
2258 | ua_chan->tracefile_count = uchan->tracefile_count; | |
2259 | ||
ffe60014 DG |
2260 | /* Copy event attributes since the layout is different. */ |
2261 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
2262 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
2263 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
2264 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
2265 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
e9404c27 | 2266 | ua_chan->monitor_timer_interval = uchan->monitor_timer_interval; |
ffe60014 | 2267 | ua_chan->attr.output = uchan->attr.output; |
491d1539 MD |
2268 | ua_chan->attr.blocking_timeout = uchan->attr.u.s.blocking_timeout; |
2269 | ||
ffe60014 DG |
2270 | /* |
2271 | * Note that the attribute channel type is not set since the channel on the | |
2272 | * tracing registry side does not have this information. | |
2273 | */ | |
48842b30 | 2274 | |
fc34caaa | 2275 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 2276 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 2277 | |
fc34caaa | 2278 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
2279 | } |
2280 | ||
5b4a0ec0 DG |
2281 | /* |
2282 | * Copy data between a UST app session and a regular LTT session. | |
2283 | */ | |
421cb601 | 2284 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 2285 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 2286 | { |
477d7741 MD |
2287 | struct tm *timeinfo; |
2288 | char datetime[16]; | |
2289 | int ret; | |
d7ba1388 | 2290 | char tmp_shm_path[PATH_MAX]; |
477d7741 | 2291 | |
940c4592 | 2292 | timeinfo = localtime(&app->registration_time); |
477d7741 | 2293 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); |
48842b30 | 2294 | |
421cb601 | 2295 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 2296 | |
7972aab2 DG |
2297 | ua_sess->tracing_id = usess->id; |
2298 | ua_sess->id = get_next_session_id(); | |
ff588497 JR |
2299 | LTTNG_OPTIONAL_SET(&ua_sess->real_credentials.uid, app->uid); |
2300 | LTTNG_OPTIONAL_SET(&ua_sess->real_credentials.gid, app->gid); | |
2301 | LTTNG_OPTIONAL_SET(&ua_sess->effective_credentials.uid, usess->uid); | |
2302 | LTTNG_OPTIONAL_SET(&ua_sess->effective_credentials.gid, usess->gid); | |
7972aab2 DG |
2303 | ua_sess->buffer_type = usess->buffer_type; |
2304 | ua_sess->bits_per_long = app->bits_per_long; | |
6addfa37 | 2305 | |
7972aab2 | 2306 | /* There is only one consumer object per session possible. */ |
6addfa37 | 2307 | consumer_output_get(usess->consumer); |
7972aab2 | 2308 | ua_sess->consumer = usess->consumer; |
6addfa37 | 2309 | |
2bba9e53 | 2310 | ua_sess->output_traces = usess->output_traces; |
ecc48a90 | 2311 | ua_sess->live_timer_interval = usess->live_timer_interval; |
84ad93e8 DG |
2312 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, |
2313 | &usess->metadata_attr); | |
7972aab2 DG |
2314 | |
2315 | switch (ua_sess->buffer_type) { | |
2316 | case LTTNG_BUFFER_PER_PID: | |
2317 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 2318 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
2319 | datetime); |
2320 | break; | |
2321 | case LTTNG_BUFFER_PER_UID: | |
2322 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
470cc211 | 2323 | DEFAULT_UST_TRACE_UID_PATH, |
ff588497 | 2324 | lttng_credentials_get_uid(&ua_sess->real_credentials), |
470cc211 | 2325 | app->bits_per_long); |
7972aab2 DG |
2326 | break; |
2327 | default: | |
2328 | assert(0); | |
2329 | goto error; | |
2330 | } | |
477d7741 MD |
2331 | if (ret < 0) { |
2332 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 2333 | assert(0); |
7972aab2 | 2334 | goto error; |
477d7741 MD |
2335 | } |
2336 | ||
3d071855 MD |
2337 | strncpy(ua_sess->root_shm_path, usess->root_shm_path, |
2338 | sizeof(ua_sess->root_shm_path)); | |
2339 | ua_sess->root_shm_path[sizeof(ua_sess->root_shm_path) - 1] = '\0'; | |
d7ba1388 MD |
2340 | strncpy(ua_sess->shm_path, usess->shm_path, |
2341 | sizeof(ua_sess->shm_path)); | |
2342 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
2343 | if (ua_sess->shm_path[0]) { | |
2344 | switch (ua_sess->buffer_type) { | |
2345 | case LTTNG_BUFFER_PER_PID: | |
2346 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
5da88b0f | 2347 | "/" DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", |
d7ba1388 MD |
2348 | app->name, app->pid, datetime); |
2349 | break; | |
2350 | case LTTNG_BUFFER_PER_UID: | |
2351 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
5da88b0f | 2352 | "/" DEFAULT_UST_TRACE_UID_PATH, |
d7ba1388 MD |
2353 | app->uid, app->bits_per_long); |
2354 | break; | |
2355 | default: | |
2356 | assert(0); | |
2357 | goto error; | |
2358 | } | |
2359 | if (ret < 0) { | |
2360 | PERROR("sprintf UST shadow copy session"); | |
2361 | assert(0); | |
2362 | goto error; | |
2363 | } | |
2364 | strncat(ua_sess->shm_path, tmp_shm_path, | |
2365 | sizeof(ua_sess->shm_path) - strlen(ua_sess->shm_path) - 1); | |
2366 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
2367 | } | |
6addfa37 | 2368 | return; |
7972aab2 DG |
2369 | |
2370 | error: | |
6addfa37 | 2371 | consumer_output_put(ua_sess->consumer); |
48842b30 DG |
2372 | } |
2373 | ||
78f0bacd DG |
2374 | /* |
2375 | * Lookup sesison wrapper. | |
2376 | */ | |
84cd17c6 | 2377 | static |
fb9a95c4 | 2378 | void __lookup_session_by_app(const struct ltt_ust_session *usess, |
bec39940 | 2379 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
2380 | { |
2381 | /* Get right UST app session from app */ | |
d9bf3ca4 | 2382 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
2383 | } |
2384 | ||
421cb601 DG |
2385 | /* |
2386 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 2387 | * id. |
421cb601 | 2388 | */ |
48842b30 | 2389 | static struct ust_app_session *lookup_session_by_app( |
fb9a95c4 | 2390 | const struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 2391 | { |
bec39940 | 2392 | struct lttng_ht_iter iter; |
d9bf3ca4 | 2393 | struct lttng_ht_node_u64 *node; |
48842b30 | 2394 | |
84cd17c6 | 2395 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 2396 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
2397 | if (node == NULL) { |
2398 | goto error; | |
2399 | } | |
2400 | ||
2401 | return caa_container_of(node, struct ust_app_session, node); | |
2402 | ||
2403 | error: | |
2404 | return NULL; | |
2405 | } | |
2406 | ||
7972aab2 DG |
2407 | /* |
2408 | * Setup buffer registry per PID for the given session and application. If none | |
2409 | * is found, a new one is created, added to the global registry and | |
2410 | * initialized. If regp is valid, it's set with the newly created object. | |
2411 | * | |
2412 | * Return 0 on success or else a negative value. | |
2413 | */ | |
2414 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
2415 | struct ust_app *app, struct buffer_reg_pid **regp) | |
2416 | { | |
2417 | int ret = 0; | |
2418 | struct buffer_reg_pid *reg_pid; | |
2419 | ||
2420 | assert(ua_sess); | |
2421 | assert(app); | |
2422 | ||
2423 | rcu_read_lock(); | |
2424 | ||
2425 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
2426 | if (!reg_pid) { | |
2427 | /* | |
2428 | * This is the create channel path meaning that if there is NO | |
2429 | * registry available, we have to create one for this session. | |
2430 | */ | |
d7ba1388 | 2431 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid, |
3d071855 | 2432 | ua_sess->root_shm_path, ua_sess->shm_path); |
7972aab2 DG |
2433 | if (ret < 0) { |
2434 | goto error; | |
2435 | } | |
7972aab2 DG |
2436 | } else { |
2437 | goto end; | |
2438 | } | |
2439 | ||
2440 | /* Initialize registry. */ | |
2441 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
2442 | app->bits_per_long, app->uint8_t_alignment, | |
2443 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf | 2444 | app->uint64_t_alignment, app->long_alignment, |
470cc211 JG |
2445 | app->byte_order, app->version.major, app->version.minor, |
2446 | reg_pid->root_shm_path, reg_pid->shm_path, | |
ff588497 JR |
2447 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
2448 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
2449 | ua_sess->tracing_id, | |
8de88061 | 2450 | app->uid); |
7972aab2 | 2451 | if (ret < 0) { |
286c991a MD |
2452 | /* |
2453 | * reg_pid->registry->reg.ust is NULL upon error, so we need to | |
2454 | * destroy the buffer registry, because it is always expected | |
2455 | * that if the buffer registry can be found, its ust registry is | |
2456 | * non-NULL. | |
2457 | */ | |
2458 | buffer_reg_pid_destroy(reg_pid); | |
7972aab2 DG |
2459 | goto error; |
2460 | } | |
2461 | ||
286c991a MD |
2462 | buffer_reg_pid_add(reg_pid); |
2463 | ||
7972aab2 DG |
2464 | DBG3("UST app buffer registry per PID created successfully"); |
2465 | ||
2466 | end: | |
2467 | if (regp) { | |
2468 | *regp = reg_pid; | |
2469 | } | |
2470 | error: | |
2471 | rcu_read_unlock(); | |
2472 | return ret; | |
2473 | } | |
2474 | ||
2475 | /* | |
2476 | * Setup buffer registry per UID for the given session and application. If none | |
2477 | * is found, a new one is created, added to the global registry and | |
2478 | * initialized. If regp is valid, it's set with the newly created object. | |
2479 | * | |
2480 | * Return 0 on success or else a negative value. | |
2481 | */ | |
2482 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
d7ba1388 | 2483 | struct ust_app_session *ua_sess, |
7972aab2 DG |
2484 | struct ust_app *app, struct buffer_reg_uid **regp) |
2485 | { | |
2486 | int ret = 0; | |
2487 | struct buffer_reg_uid *reg_uid; | |
2488 | ||
2489 | assert(usess); | |
2490 | assert(app); | |
2491 | ||
2492 | rcu_read_lock(); | |
2493 | ||
2494 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2495 | if (!reg_uid) { | |
2496 | /* | |
2497 | * This is the create channel path meaning that if there is NO | |
2498 | * registry available, we have to create one for this session. | |
2499 | */ | |
2500 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
3d071855 MD |
2501 | LTTNG_DOMAIN_UST, ®_uid, |
2502 | ua_sess->root_shm_path, ua_sess->shm_path); | |
7972aab2 DG |
2503 | if (ret < 0) { |
2504 | goto error; | |
2505 | } | |
7972aab2 DG |
2506 | } else { |
2507 | goto end; | |
2508 | } | |
2509 | ||
2510 | /* Initialize registry. */ | |
af6142cf | 2511 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
2512 | app->bits_per_long, app->uint8_t_alignment, |
2513 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
2514 | app->uint64_t_alignment, app->long_alignment, |
2515 | app->byte_order, app->version.major, | |
3d071855 | 2516 | app->version.minor, reg_uid->root_shm_path, |
8de88061 JR |
2517 | reg_uid->shm_path, usess->uid, usess->gid, |
2518 | ua_sess->tracing_id, app->uid); | |
7972aab2 | 2519 | if (ret < 0) { |
286c991a MD |
2520 | /* |
2521 | * reg_uid->registry->reg.ust is NULL upon error, so we need to | |
2522 | * destroy the buffer registry, because it is always expected | |
2523 | * that if the buffer registry can be found, its ust registry is | |
2524 | * non-NULL. | |
2525 | */ | |
2526 | buffer_reg_uid_destroy(reg_uid, NULL); | |
7972aab2 DG |
2527 | goto error; |
2528 | } | |
2529 | /* Add node to teardown list of the session. */ | |
2530 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
2531 | ||
286c991a | 2532 | buffer_reg_uid_add(reg_uid); |
7972aab2 | 2533 | |
286c991a | 2534 | DBG3("UST app buffer registry per UID created successfully"); |
7972aab2 DG |
2535 | end: |
2536 | if (regp) { | |
2537 | *regp = reg_uid; | |
2538 | } | |
2539 | error: | |
2540 | rcu_read_unlock(); | |
2541 | return ret; | |
2542 | } | |
2543 | ||
421cb601 | 2544 | /* |
3d8ca23b | 2545 | * Create a session on the tracer side for the given app. |
421cb601 | 2546 | * |
3d8ca23b DG |
2547 | * On success, ua_sess_ptr is populated with the session pointer or else left |
2548 | * untouched. If the session was created, is_created is set to 1. On error, | |
2549 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
2550 | * be NULL. | |
2551 | * | |
2552 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
2553 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 2554 | */ |
03f91eaa | 2555 | static int find_or_create_ust_app_session(struct ltt_ust_session *usess, |
3d8ca23b DG |
2556 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, |
2557 | int *is_created) | |
421cb601 | 2558 | { |
3d8ca23b | 2559 | int ret, created = 0; |
421cb601 DG |
2560 | struct ust_app_session *ua_sess; |
2561 | ||
3d8ca23b DG |
2562 | assert(usess); |
2563 | assert(app); | |
2564 | assert(ua_sess_ptr); | |
2565 | ||
840cb59c | 2566 | health_code_update(); |
86acf0da | 2567 | |
421cb601 DG |
2568 | ua_sess = lookup_session_by_app(usess, app); |
2569 | if (ua_sess == NULL) { | |
d9bf3ca4 | 2570 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 2571 | app->pid, usess->id); |
40bbd087 | 2572 | ua_sess = alloc_ust_app_session(); |
421cb601 DG |
2573 | if (ua_sess == NULL) { |
2574 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
2575 | ret = -ENOMEM; |
2576 | goto error; | |
421cb601 | 2577 | } |
477d7741 | 2578 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 2579 | created = 1; |
421cb601 DG |
2580 | } |
2581 | ||
7972aab2 DG |
2582 | switch (usess->buffer_type) { |
2583 | case LTTNG_BUFFER_PER_PID: | |
2584 | /* Init local registry. */ | |
2585 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 2586 | if (ret < 0) { |
e64207cf | 2587 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2588 | goto error; |
2589 | } | |
2590 | break; | |
2591 | case LTTNG_BUFFER_PER_UID: | |
2592 | /* Look for a global registry. If none exists, create one. */ | |
d7ba1388 | 2593 | ret = setup_buffer_reg_uid(usess, ua_sess, app, NULL); |
7972aab2 | 2594 | if (ret < 0) { |
e64207cf | 2595 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2596 | goto error; |
2597 | } | |
2598 | break; | |
2599 | default: | |
2600 | assert(0); | |
2601 | ret = -EINVAL; | |
2602 | goto error; | |
2603 | } | |
2604 | ||
2605 | health_code_update(); | |
2606 | ||
2607 | if (ua_sess->handle == -1) { | |
fb45065e | 2608 | pthread_mutex_lock(&app->sock_lock); |
7972aab2 | 2609 | ret = ustctl_create_session(app->sock); |
fb45065e | 2610 | pthread_mutex_unlock(&app->sock_lock); |
7972aab2 DG |
2611 | if (ret < 0) { |
2612 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
2613 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
2614 | app->pid, ret); |
2615 | } else { | |
2616 | DBG("UST app creating session failed. Application is dead"); | |
3757b385 DG |
2617 | /* |
2618 | * This is normal behavior, an application can die during the | |
2619 | * creation process. Don't report an error so the execution can | |
2620 | * continue normally. This will get flagged ENOTCONN and the | |
2621 | * caller will handle it. | |
2622 | */ | |
2623 | ret = 0; | |
ffe60014 | 2624 | } |
d0b96690 | 2625 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
2626 | if (ret != -ENOMEM) { |
2627 | /* | |
2628 | * Tracer is probably gone or got an internal error so let's | |
2629 | * behave like it will soon unregister or not usable. | |
2630 | */ | |
2631 | ret = -ENOTCONN; | |
2632 | } | |
2633 | goto error; | |
421cb601 DG |
2634 | } |
2635 | ||
7972aab2 DG |
2636 | ua_sess->handle = ret; |
2637 | ||
2638 | /* Add ust app session to app's HT */ | |
d9bf3ca4 MD |
2639 | lttng_ht_node_init_u64(&ua_sess->node, |
2640 | ua_sess->tracing_id); | |
2641 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
10b56aef MD |
2642 | lttng_ht_node_init_ulong(&ua_sess->ust_objd_node, ua_sess->handle); |
2643 | lttng_ht_add_unique_ulong(app->ust_sessions_objd, | |
2644 | &ua_sess->ust_objd_node); | |
7972aab2 DG |
2645 | |
2646 | DBG2("UST app session created successfully with handle %d", ret); | |
2647 | } | |
2648 | ||
2649 | *ua_sess_ptr = ua_sess; | |
2650 | if (is_created) { | |
2651 | *is_created = created; | |
2652 | } | |
2653 | ||
2654 | /* Everything went well. */ | |
2655 | ret = 0; | |
2656 | ||
2657 | error: | |
2658 | health_code_update(); | |
2659 | return ret; | |
2660 | } | |
2661 | ||
6a6b2068 JG |
2662 | /* |
2663 | * Match function for a hash table lookup of ust_app_ctx. | |
2664 | * | |
2665 | * It matches an ust app context based on the context type and, in the case | |
2666 | * of perf counters, their name. | |
2667 | */ | |
2668 | static int ht_match_ust_app_ctx(struct cds_lfht_node *node, const void *_key) | |
2669 | { | |
2670 | struct ust_app_ctx *ctx; | |
bdf64013 | 2671 | const struct lttng_ust_context_attr *key; |
6a6b2068 JG |
2672 | |
2673 | assert(node); | |
2674 | assert(_key); | |
2675 | ||
2676 | ctx = caa_container_of(node, struct ust_app_ctx, node.node); | |
2677 | key = _key; | |
2678 | ||
2679 | /* Context type */ | |
2680 | if (ctx->ctx.ctx != key->ctx) { | |
2681 | goto no_match; | |
2682 | } | |
2683 | ||
bdf64013 | 2684 | switch(key->ctx) { |
fc4b93fa | 2685 | case LTTNG_UST_ABI_CONTEXT_PERF_THREAD_COUNTER: |
6a6b2068 | 2686 | if (strncmp(key->u.perf_counter.name, |
bdf64013 JG |
2687 | ctx->ctx.u.perf_counter.name, |
2688 | sizeof(key->u.perf_counter.name))) { | |
2689 | goto no_match; | |
2690 | } | |
2691 | break; | |
fc4b93fa | 2692 | case LTTNG_UST_ABI_CONTEXT_APP_CONTEXT: |
bdf64013 JG |
2693 | if (strcmp(key->u.app_ctx.provider_name, |
2694 | ctx->ctx.u.app_ctx.provider_name) || | |
2695 | strcmp(key->u.app_ctx.ctx_name, | |
2696 | ctx->ctx.u.app_ctx.ctx_name)) { | |
6a6b2068 JG |
2697 | goto no_match; |
2698 | } | |
bdf64013 JG |
2699 | break; |
2700 | default: | |
2701 | break; | |
6a6b2068 JG |
2702 | } |
2703 | ||
2704 | /* Match. */ | |
2705 | return 1; | |
2706 | ||
2707 | no_match: | |
2708 | return 0; | |
2709 | } | |
2710 | ||
2711 | /* | |
2712 | * Lookup for an ust app context from an lttng_ust_context. | |
2713 | * | |
be184a0f | 2714 | * Must be called while holding RCU read side lock. |
6a6b2068 JG |
2715 | * Return an ust_app_ctx object or NULL on error. |
2716 | */ | |
2717 | static | |
2718 | struct ust_app_ctx *find_ust_app_context(struct lttng_ht *ht, | |
bdf64013 | 2719 | struct lttng_ust_context_attr *uctx) |
6a6b2068 JG |
2720 | { |
2721 | struct lttng_ht_iter iter; | |
2722 | struct lttng_ht_node_ulong *node; | |
2723 | struct ust_app_ctx *app_ctx = NULL; | |
2724 | ||
2725 | assert(uctx); | |
2726 | assert(ht); | |
2727 | ||
2728 | /* Lookup using the lttng_ust_context_type and a custom match fct. */ | |
2729 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) uctx->ctx, lttng_ht_seed), | |
2730 | ht_match_ust_app_ctx, uctx, &iter.iter); | |
2731 | node = lttng_ht_iter_get_node_ulong(&iter); | |
2732 | if (!node) { | |
2733 | goto end; | |
2734 | } | |
2735 | ||
2736 | app_ctx = caa_container_of(node, struct ust_app_ctx, node); | |
2737 | ||
2738 | end: | |
2739 | return app_ctx; | |
2740 | } | |
2741 | ||
7972aab2 DG |
2742 | /* |
2743 | * Create a context for the channel on the tracer. | |
2744 | * | |
2745 | * Called with UST app session lock held and a RCU read side lock. | |
2746 | */ | |
2747 | static | |
c9edf082 | 2748 | int create_ust_app_channel_context(struct ust_app_channel *ua_chan, |
f3db82be | 2749 | struct lttng_ust_context_attr *uctx, |
7972aab2 DG |
2750 | struct ust_app *app) |
2751 | { | |
2752 | int ret = 0; | |
7972aab2 DG |
2753 | struct ust_app_ctx *ua_ctx; |
2754 | ||
2755 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
2756 | ||
6a6b2068 JG |
2757 | ua_ctx = find_ust_app_context(ua_chan->ctx, uctx); |
2758 | if (ua_ctx) { | |
7972aab2 DG |
2759 | ret = -EEXIST; |
2760 | goto error; | |
2761 | } | |
2762 | ||
2763 | ua_ctx = alloc_ust_app_ctx(uctx); | |
2764 | if (ua_ctx == NULL) { | |
2765 | /* malloc failed */ | |
7682f304 | 2766 | ret = -ENOMEM; |
7972aab2 DG |
2767 | goto error; |
2768 | } | |
2769 | ||
2770 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 2771 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 2772 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
2773 | |
2774 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
2775 | if (ret < 0) { | |
2776 | goto error; | |
2777 | } | |
2778 | ||
2779 | error: | |
2780 | return ret; | |
2781 | } | |
2782 | ||
2783 | /* | |
2784 | * Enable on the tracer side a ust app event for the session and channel. | |
2785 | * | |
2786 | * Called with UST app session lock held. | |
2787 | */ | |
2788 | static | |
2789 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
2790 | struct ust_app_event *ua_event, struct ust_app *app) | |
2791 | { | |
2792 | int ret; | |
2793 | ||
3428a1b7 | 2794 | ret = enable_ust_object(app, ua_event->obj); |
7972aab2 DG |
2795 | if (ret < 0) { |
2796 | goto error; | |
2797 | } | |
2798 | ||
2799 | ua_event->enabled = 1; | |
2800 | ||
2801 | error: | |
2802 | return ret; | |
2803 | } | |
2804 | ||
2805 | /* | |
2806 | * Disable on the tracer side a ust app event for the session and channel. | |
2807 | */ | |
2808 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
2809 | struct ust_app_event *ua_event, struct ust_app *app) | |
2810 | { | |
2811 | int ret; | |
2812 | ||
e2456d0a | 2813 | ret = disable_ust_object(app, ua_event->obj); |
7972aab2 DG |
2814 | if (ret < 0) { |
2815 | goto error; | |
2816 | } | |
2817 | ||
2818 | ua_event->enabled = 0; | |
2819 | ||
2820 | error: | |
2821 | return ret; | |
2822 | } | |
2823 | ||
2824 | /* | |
2825 | * Lookup ust app channel for session and disable it on the tracer side. | |
2826 | */ | |
2827 | static | |
2828 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
2829 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
2830 | { | |
2831 | int ret; | |
2832 | ||
2833 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2834 | if (ret < 0) { | |
2835 | goto error; | |
2836 | } | |
2837 | ||
2838 | ua_chan->enabled = 0; | |
2839 | ||
2840 | error: | |
2841 | return ret; | |
2842 | } | |
2843 | ||
2844 | /* | |
2845 | * Lookup ust app channel for session and enable it on the tracer side. This | |
2846 | * MUST be called with a RCU read side lock acquired. | |
2847 | */ | |
2848 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
2849 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
2850 | { | |
2851 | int ret = 0; | |
2852 | struct lttng_ht_iter iter; | |
2853 | struct lttng_ht_node_str *ua_chan_node; | |
2854 | struct ust_app_channel *ua_chan; | |
2855 | ||
2856 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
2857 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
2858 | if (ua_chan_node == NULL) { | |
d9bf3ca4 | 2859 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
2860 | uchan->name, ua_sess->tracing_id); |
2861 | goto error; | |
2862 | } | |
2863 | ||
2864 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2865 | ||
2866 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
2867 | if (ret < 0) { | |
2868 | goto error; | |
2869 | } | |
2870 | ||
2871 | error: | |
2872 | return ret; | |
2873 | } | |
2874 | ||
2875 | /* | |
2876 | * Ask the consumer to create a channel and get it if successful. | |
2877 | * | |
fad1ed2f JR |
2878 | * Called with UST app session lock held. |
2879 | * | |
7972aab2 DG |
2880 | * Return 0 on success or else a negative value. |
2881 | */ | |
2882 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
2883 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
e098433c JG |
2884 | int bitness, struct ust_registry_session *registry, |
2885 | uint64_t trace_archive_id) | |
7972aab2 DG |
2886 | { |
2887 | int ret; | |
2888 | unsigned int nb_fd = 0; | |
2889 | struct consumer_socket *socket; | |
2890 | ||
2891 | assert(usess); | |
2892 | assert(ua_sess); | |
2893 | assert(ua_chan); | |
2894 | assert(registry); | |
2895 | ||
2896 | rcu_read_lock(); | |
2897 | health_code_update(); | |
2898 | ||
2899 | /* Get the right consumer socket for the application. */ | |
2900 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
2901 | if (!socket) { | |
2902 | ret = -EINVAL; | |
2903 | goto error; | |
2904 | } | |
2905 | ||
2906 | health_code_update(); | |
2907 | ||
2908 | /* Need one fd for the channel. */ | |
2909 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2910 | if (ret < 0) { | |
2911 | ERR("Exhausted number of available FD upon create channel"); | |
2912 | goto error; | |
2913 | } | |
2914 | ||
2915 | /* | |
2916 | * Ask consumer to create channel. The consumer will return the number of | |
2917 | * stream we have to expect. | |
2918 | */ | |
2919 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
d2956687 | 2920 | registry, usess->current_trace_chunk); |
7972aab2 DG |
2921 | if (ret < 0) { |
2922 | goto error_ask; | |
2923 | } | |
2924 | ||
2925 | /* | |
2926 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2927 | * stream (2 being the default value here). | |
2928 | */ | |
2929 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2930 | ||
2931 | /* Reserve the amount of file descriptor we need. */ | |
2932 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2933 | if (ret < 0) { | |
2934 | ERR("Exhausted number of available FD upon create channel"); | |
2935 | goto error_fd_get_stream; | |
2936 | } | |
2937 | ||
2938 | health_code_update(); | |
2939 | ||
2940 | /* | |
2941 | * Now get the channel from the consumer. This call wil populate the stream | |
2942 | * list of that channel and set the ust objects. | |
2943 | */ | |
d9078d0c DG |
2944 | if (usess->consumer->enabled) { |
2945 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2946 | if (ret < 0) { | |
2947 | goto error_destroy; | |
2948 | } | |
7972aab2 DG |
2949 | } |
2950 | ||
2951 | rcu_read_unlock(); | |
2952 | return 0; | |
2953 | ||
2954 | error_destroy: | |
2955 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2956 | error_fd_get_stream: | |
2957 | /* | |
2958 | * Initiate a destroy channel on the consumer since we had an error | |
2959 | * handling it on our side. The return value is of no importance since we | |
2960 | * already have a ret value set by the previous error that we need to | |
2961 | * return. | |
2962 | */ | |
2963 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2964 | error_ask: | |
2965 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2966 | error: | |
2967 | health_code_update(); | |
2968 | rcu_read_unlock(); | |
2969 | return ret; | |
2970 | } | |
2971 | ||
2972 | /* | |
2973 | * Duplicate the ust data object of the ust app stream and save it in the | |
2974 | * buffer registry stream. | |
2975 | * | |
2976 | * Return 0 on success or else a negative value. | |
2977 | */ | |
2978 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2979 | struct ust_app_stream *stream) | |
2980 | { | |
2981 | int ret; | |
2982 | ||
2983 | assert(reg_stream); | |
2984 | assert(stream); | |
2985 | ||
2986 | /* Reserve the amount of file descriptor we need. */ | |
2987 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2988 | if (ret < 0) { | |
2989 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2990 | goto error; | |
2991 | } | |
2992 | ||
2993 | /* Duplicate object for stream once the original is in the registry. */ | |
2994 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2995 | reg_stream->obj.ust); | |
2996 | if (ret < 0) { | |
2997 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2998 | reg_stream->obj.ust, stream->obj, ret); | |
2999 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
3000 | goto error; | |
3001 | } | |
3002 | stream->handle = stream->obj->handle; | |
3003 | ||
3004 | error: | |
3005 | return ret; | |
3006 | } | |
3007 | ||
3008 | /* | |
3009 | * Duplicate the ust data object of the ust app. channel and save it in the | |
3010 | * buffer registry channel. | |
3011 | * | |
3012 | * Return 0 on success or else a negative value. | |
3013 | */ | |
3014 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
3015 | struct ust_app_channel *ua_chan) | |
3016 | { | |
3017 | int ret; | |
3018 | ||
3019 | assert(reg_chan); | |
3020 | assert(ua_chan); | |
3021 | ||
3022 | /* Need two fds for the channel. */ | |
3023 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
3024 | if (ret < 0) { | |
3025 | ERR("Exhausted number of available FD upon duplicate channel"); | |
3026 | goto error_fd_get; | |
3027 | } | |
3028 | ||
3029 | /* Duplicate object for stream once the original is in the registry. */ | |
3030 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
3031 | if (ret < 0) { | |
3032 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
3033 | reg_chan->obj.ust, ua_chan->obj, ret); | |
3034 | goto error; | |
3035 | } | |
3036 | ua_chan->handle = ua_chan->obj->handle; | |
3037 | ||
3038 | return 0; | |
3039 | ||
3040 | error: | |
3041 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
3042 | error_fd_get: | |
3043 | return ret; | |
3044 | } | |
3045 | ||
3046 | /* | |
3047 | * For a given channel buffer registry, setup all streams of the given ust | |
3048 | * application channel. | |
3049 | * | |
3050 | * Return 0 on success or else a negative value. | |
3051 | */ | |
3052 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
fb45065e MD |
3053 | struct ust_app_channel *ua_chan, |
3054 | struct ust_app *app) | |
7972aab2 DG |
3055 | { |
3056 | int ret = 0; | |
3057 | struct ust_app_stream *stream, *stmp; | |
3058 | ||
3059 | assert(reg_chan); | |
3060 | assert(ua_chan); | |
3061 | ||
3062 | DBG2("UST app setup buffer registry stream"); | |
3063 | ||
3064 | /* Send all streams to application. */ | |
3065 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
3066 | struct buffer_reg_stream *reg_stream; | |
3067 | ||
3068 | ret = buffer_reg_stream_create(®_stream); | |
3069 | if (ret < 0) { | |
3070 | goto error; | |
3071 | } | |
3072 | ||
3073 | /* | |
3074 | * Keep original pointer and nullify it in the stream so the delete | |
3075 | * stream call does not release the object. | |
3076 | */ | |
3077 | reg_stream->obj.ust = stream->obj; | |
3078 | stream->obj = NULL; | |
3079 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 3080 | |
7972aab2 DG |
3081 | /* We don't need the streams anymore. */ |
3082 | cds_list_del(&stream->list); | |
fb45065e | 3083 | delete_ust_app_stream(-1, stream, app); |
7972aab2 | 3084 | } |
421cb601 | 3085 | |
7972aab2 DG |
3086 | error: |
3087 | return ret; | |
3088 | } | |
3089 | ||
3090 | /* | |
3091 | * Create a buffer registry channel for the given session registry and | |
3092 | * application channel object. If regp pointer is valid, it's set with the | |
3093 | * created object. Important, the created object is NOT added to the session | |
3094 | * registry hash table. | |
3095 | * | |
3096 | * Return 0 on success else a negative value. | |
3097 | */ | |
3098 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
3099 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
3100 | { | |
3101 | int ret; | |
3102 | struct buffer_reg_channel *reg_chan = NULL; | |
3103 | ||
3104 | assert(reg_sess); | |
3105 | assert(ua_chan); | |
3106 | ||
3107 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
3108 | ||
3109 | /* Create buffer registry channel. */ | |
3110 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
3111 | if (ret < 0) { | |
3112 | goto error_create; | |
421cb601 | 3113 | } |
7972aab2 DG |
3114 | assert(reg_chan); |
3115 | reg_chan->consumer_key = ua_chan->key; | |
8c924c7b | 3116 | reg_chan->subbuf_size = ua_chan->attr.subbuf_size; |
d07ceecd | 3117 | reg_chan->num_subbuf = ua_chan->attr.num_subbuf; |
421cb601 | 3118 | |
7972aab2 DG |
3119 | /* Create and add a channel registry to session. */ |
3120 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
3121 | ua_chan->tracing_channel_id); | |
3122 | if (ret < 0) { | |
3123 | goto error; | |
d88aee68 | 3124 | } |
7972aab2 | 3125 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 3126 | |
7972aab2 DG |
3127 | if (regp) { |
3128 | *regp = reg_chan; | |
3d8ca23b | 3129 | } |
d88aee68 | 3130 | |
7972aab2 | 3131 | return 0; |
3d8ca23b DG |
3132 | |
3133 | error: | |
7972aab2 DG |
3134 | /* Safe because the registry channel object was not added to any HT. */ |
3135 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
3136 | error_create: | |
3d8ca23b | 3137 | return ret; |
421cb601 DG |
3138 | } |
3139 | ||
55cc08a6 | 3140 | /* |
7972aab2 DG |
3141 | * Setup buffer registry channel for the given session registry and application |
3142 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 3143 | * |
7972aab2 | 3144 | * Return 0 on success else a negative value. |
55cc08a6 | 3145 | */ |
7972aab2 | 3146 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
fb45065e MD |
3147 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan, |
3148 | struct ust_app *app) | |
55cc08a6 | 3149 | { |
7972aab2 | 3150 | int ret; |
55cc08a6 | 3151 | |
7972aab2 DG |
3152 | assert(reg_sess); |
3153 | assert(reg_chan); | |
3154 | assert(ua_chan); | |
3155 | assert(ua_chan->obj); | |
55cc08a6 | 3156 | |
7972aab2 | 3157 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 3158 | |
7972aab2 | 3159 | /* Setup all streams for the registry. */ |
fb45065e | 3160 | ret = setup_buffer_reg_streams(reg_chan, ua_chan, app); |
7972aab2 | 3161 | if (ret < 0) { |
55cc08a6 DG |
3162 | goto error; |
3163 | } | |
3164 | ||
7972aab2 DG |
3165 | reg_chan->obj.ust = ua_chan->obj; |
3166 | ua_chan->obj = NULL; | |
55cc08a6 | 3167 | |
7972aab2 | 3168 | return 0; |
55cc08a6 DG |
3169 | |
3170 | error: | |
7972aab2 DG |
3171 | buffer_reg_channel_remove(reg_sess, reg_chan); |
3172 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
3173 | return ret; |
3174 | } | |
3175 | ||
edb67388 | 3176 | /* |
7972aab2 | 3177 | * Send buffer registry channel to the application. |
d0b96690 | 3178 | * |
7972aab2 | 3179 | * Return 0 on success else a negative value. |
edb67388 | 3180 | */ |
7972aab2 DG |
3181 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
3182 | struct ust_app *app, struct ust_app_session *ua_sess, | |
3183 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
3184 | { |
3185 | int ret; | |
7972aab2 | 3186 | struct buffer_reg_stream *reg_stream; |
edb67388 | 3187 | |
7972aab2 DG |
3188 | assert(reg_chan); |
3189 | assert(app); | |
3190 | assert(ua_sess); | |
3191 | assert(ua_chan); | |
3192 | ||
3193 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
3194 | ||
3195 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
3196 | if (ret < 0) { |
3197 | goto error; | |
3198 | } | |
3199 | ||
7972aab2 DG |
3200 | /* Send channel to the application. */ |
3201 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
3202 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
3203 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
3204 | goto error; | |
3205 | } else if (ret < 0) { | |
7972aab2 DG |
3206 | goto error; |
3207 | } | |
3208 | ||
3209 | health_code_update(); | |
3210 | ||
3211 | /* Send all streams to application. */ | |
3212 | pthread_mutex_lock(®_chan->stream_list_lock); | |
3213 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
3214 | struct ust_app_stream stream; | |
3215 | ||
3216 | ret = duplicate_stream_object(reg_stream, &stream); | |
3217 | if (ret < 0) { | |
3218 | goto error_stream_unlock; | |
3219 | } | |
3220 | ||
3221 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
3222 | if (ret < 0) { | |
fb45065e | 3223 | (void) release_ust_app_stream(-1, &stream, app); |
a7169585 MD |
3224 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
3225 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
a7169585 | 3226 | } |
7972aab2 DG |
3227 | goto error_stream_unlock; |
3228 | } | |
edb67388 | 3229 | |
7972aab2 DG |
3230 | /* |
3231 | * The return value is not important here. This function will output an | |
3232 | * error if needed. | |
3233 | */ | |
fb45065e | 3234 | (void) release_ust_app_stream(-1, &stream, app); |
7972aab2 DG |
3235 | } |
3236 | ua_chan->is_sent = 1; | |
3237 | ||
3238 | error_stream_unlock: | |
3239 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
3240 | error: |
3241 | return ret; | |
3242 | } | |
3243 | ||
9730260e | 3244 | /* |
7972aab2 DG |
3245 | * Create and send to the application the created buffers with per UID buffers. |
3246 | * | |
9acdc1d6 | 3247 | * This MUST be called with a RCU read side lock acquired. |
71e0a100 | 3248 | * The session list lock and the session's lock must be acquired. |
9acdc1d6 | 3249 | * |
7972aab2 | 3250 | * Return 0 on success else a negative value. |
9730260e | 3251 | */ |
7972aab2 DG |
3252 | static int create_channel_per_uid(struct ust_app *app, |
3253 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
3254 | struct ust_app_channel *ua_chan) | |
9730260e DG |
3255 | { |
3256 | int ret; | |
7972aab2 DG |
3257 | struct buffer_reg_uid *reg_uid; |
3258 | struct buffer_reg_channel *reg_chan; | |
e32d7f27 | 3259 | struct ltt_session *session = NULL; |
e098433c JG |
3260 | enum lttng_error_code notification_ret; |
3261 | struct ust_registry_channel *chan_reg; | |
9730260e | 3262 | |
7972aab2 DG |
3263 | assert(app); |
3264 | assert(usess); | |
3265 | assert(ua_sess); | |
3266 | assert(ua_chan); | |
3267 | ||
3268 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
3269 | ||
3270 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
3271 | /* | |
3272 | * The session creation handles the creation of this global registry | |
3273 | * object. If none can be find, there is a code flow problem or a | |
3274 | * teardown race. | |
3275 | */ | |
3276 | assert(reg_uid); | |
3277 | ||
3278 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
3279 | reg_uid); | |
2721f7ea JG |
3280 | if (reg_chan) { |
3281 | goto send_channel; | |
3282 | } | |
7972aab2 | 3283 | |
2721f7ea JG |
3284 | /* Create the buffer registry channel object. */ |
3285 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
3286 | if (ret < 0) { | |
3287 | ERR("Error creating the UST channel \"%s\" registry instance", | |
f14256d6 | 3288 | ua_chan->name); |
2721f7ea JG |
3289 | goto error; |
3290 | } | |
f14256d6 | 3291 | |
e098433c JG |
3292 | session = session_find_by_id(ua_sess->tracing_id); |
3293 | assert(session); | |
3294 | assert(pthread_mutex_trylock(&session->lock)); | |
3295 | assert(session_trylock_list()); | |
3296 | ||
2721f7ea JG |
3297 | /* |
3298 | * Create the buffers on the consumer side. This call populates the | |
3299 | * ust app channel object with all streams and data object. | |
3300 | */ | |
3301 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
e098433c | 3302 | app->bits_per_long, reg_uid->registry->reg.ust, |
d2956687 | 3303 | session->most_recent_chunk_id.value); |
2721f7ea JG |
3304 | if (ret < 0) { |
3305 | ERR("Error creating UST channel \"%s\" on the consumer daemon", | |
3306 | ua_chan->name); | |
7972aab2 DG |
3307 | |
3308 | /* | |
2721f7ea JG |
3309 | * Let's remove the previously created buffer registry channel so |
3310 | * it's not visible anymore in the session registry. | |
7972aab2 | 3311 | */ |
2721f7ea JG |
3312 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, |
3313 | ua_chan->tracing_channel_id, false); | |
3314 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
3315 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
3316 | goto error; | |
7972aab2 DG |
3317 | } |
3318 | ||
2721f7ea JG |
3319 | /* |
3320 | * Setup the streams and add it to the session registry. | |
3321 | */ | |
3322 | ret = setup_buffer_reg_channel(reg_uid->registry, | |
3323 | ua_chan, reg_chan, app); | |
3324 | if (ret < 0) { | |
3325 | ERR("Error setting up UST channel \"%s\"", ua_chan->name); | |
3326 | goto error; | |
3327 | } | |
3328 | ||
e098433c JG |
3329 | /* Notify the notification subsystem of the channel's creation. */ |
3330 | pthread_mutex_lock(®_uid->registry->reg.ust->lock); | |
3331 | chan_reg = ust_registry_channel_find(reg_uid->registry->reg.ust, | |
3332 | ua_chan->tracing_channel_id); | |
3333 | assert(chan_reg); | |
3334 | chan_reg->consumer_key = ua_chan->key; | |
3335 | chan_reg = NULL; | |
3336 | pthread_mutex_unlock(®_uid->registry->reg.ust->lock); | |
e9404c27 | 3337 | |
e098433c JG |
3338 | notification_ret = notification_thread_command_add_channel( |
3339 | notification_thread_handle, session->name, | |
ff588497 JR |
3340 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
3341 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
3342 | ua_chan->name, | |
470cc211 | 3343 | ua_chan->key, LTTNG_DOMAIN_UST, |
e098433c JG |
3344 | ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf); |
3345 | if (notification_ret != LTTNG_OK) { | |
3346 | ret = - (int) notification_ret; | |
3347 | ERR("Failed to add channel to notification thread"); | |
3348 | goto error; | |
e9404c27 JG |
3349 | } |
3350 | ||
2721f7ea | 3351 | send_channel: |
66ff8e3f JG |
3352 | /* Send buffers to the application. */ |
3353 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
3354 | if (ret < 0) { | |
3355 | if (ret != -ENOTCONN) { | |
3356 | ERR("Error sending channel to application"); | |
3357 | } | |
3358 | goto error; | |
3359 | } | |
3360 | ||
9730260e | 3361 | error: |
e32d7f27 JG |
3362 | if (session) { |
3363 | session_put(session); | |
3364 | } | |
9730260e DG |
3365 | return ret; |
3366 | } | |
3367 | ||
78f0bacd | 3368 | /* |
7972aab2 DG |
3369 | * Create and send to the application the created buffers with per PID buffers. |
3370 | * | |
fad1ed2f | 3371 | * Called with UST app session lock held. |
71e0a100 | 3372 | * The session list lock and the session's lock must be acquired. |
fad1ed2f | 3373 | * |
7972aab2 | 3374 | * Return 0 on success else a negative value. |
78f0bacd | 3375 | */ |
7972aab2 DG |
3376 | static int create_channel_per_pid(struct ust_app *app, |
3377 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
3378 | struct ust_app_channel *ua_chan) | |
78f0bacd | 3379 | { |
8535a6d9 | 3380 | int ret; |
7972aab2 | 3381 | struct ust_registry_session *registry; |
e9404c27 | 3382 | enum lttng_error_code cmd_ret; |
e32d7f27 | 3383 | struct ltt_session *session = NULL; |
e9404c27 JG |
3384 | uint64_t chan_reg_key; |
3385 | struct ust_registry_channel *chan_reg; | |
78f0bacd | 3386 | |
7972aab2 DG |
3387 | assert(app); |
3388 | assert(usess); | |
3389 | assert(ua_sess); | |
3390 | assert(ua_chan); | |
3391 | ||
3392 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
3393 | ||
3394 | rcu_read_lock(); | |
3395 | ||
3396 | registry = get_session_registry(ua_sess); | |
fad1ed2f | 3397 | /* The UST app session lock is held, registry shall not be null. */ |
7972aab2 DG |
3398 | assert(registry); |
3399 | ||
3400 | /* Create and add a new channel registry to session. */ | |
3401 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd | 3402 | if (ret < 0) { |
f14256d6 MD |
3403 | ERR("Error creating the UST channel \"%s\" registry instance", |
3404 | ua_chan->name); | |
78f0bacd DG |
3405 | goto error; |
3406 | } | |
3407 | ||
e098433c JG |
3408 | session = session_find_by_id(ua_sess->tracing_id); |
3409 | assert(session); | |
3410 | ||
3411 | assert(pthread_mutex_trylock(&session->lock)); | |
3412 | assert(session_trylock_list()); | |
3413 | ||
7972aab2 DG |
3414 | /* Create and get channel on the consumer side. */ |
3415 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
e098433c | 3416 | app->bits_per_long, registry, |
d2956687 | 3417 | session->most_recent_chunk_id.value); |
7972aab2 | 3418 | if (ret < 0) { |
f14256d6 MD |
3419 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
3420 | ua_chan->name); | |
5b951542 | 3421 | goto error_remove_from_registry; |
7972aab2 DG |
3422 | } |
3423 | ||
3424 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
3425 | if (ret < 0) { | |
a7169585 MD |
3426 | if (ret != -ENOTCONN) { |
3427 | ERR("Error sending channel to application"); | |
3428 | } | |
5b951542 | 3429 | goto error_remove_from_registry; |
7972aab2 | 3430 | } |
8535a6d9 | 3431 | |
e9404c27 JG |
3432 | chan_reg_key = ua_chan->key; |
3433 | pthread_mutex_lock(®istry->lock); | |
3434 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
3435 | assert(chan_reg); | |
3436 | chan_reg->consumer_key = ua_chan->key; | |
3437 | pthread_mutex_unlock(®istry->lock); | |
3438 | ||
3439 | cmd_ret = notification_thread_command_add_channel( | |
3440 | notification_thread_handle, session->name, | |
ff588497 JR |
3441 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
3442 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
3443 | ua_chan->name, | |
470cc211 | 3444 | ua_chan->key, LTTNG_DOMAIN_UST, |
e9404c27 JG |
3445 | ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf); |
3446 | if (cmd_ret != LTTNG_OK) { | |
3447 | ret = - (int) cmd_ret; | |
3448 | ERR("Failed to add channel to notification thread"); | |
5b951542 | 3449 | goto error_remove_from_registry; |
e9404c27 JG |
3450 | } |
3451 | ||
5b951542 MD |
3452 | error_remove_from_registry: |
3453 | if (ret) { | |
3454 | ust_registry_channel_del_free(registry, ua_chan->key, false); | |
3455 | } | |
78f0bacd | 3456 | error: |
7972aab2 | 3457 | rcu_read_unlock(); |
e32d7f27 JG |
3458 | if (session) { |
3459 | session_put(session); | |
3460 | } | |
78f0bacd DG |
3461 | return ret; |
3462 | } | |
3463 | ||
3464 | /* | |
7972aab2 | 3465 | * From an already allocated ust app channel, create the channel buffers if |
88e3c2f5 | 3466 | * needed and send them to the application. This MUST be called with a RCU read |
7972aab2 DG |
3467 | * side lock acquired. |
3468 | * | |
fad1ed2f JR |
3469 | * Called with UST app session lock held. |
3470 | * | |
a7169585 MD |
3471 | * Return 0 on success or else a negative value. Returns -ENOTCONN if |
3472 | * the application exited concurrently. | |
78f0bacd | 3473 | */ |
88e3c2f5 | 3474 | static int ust_app_channel_send(struct ust_app *app, |
7972aab2 DG |
3475 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, |
3476 | struct ust_app_channel *ua_chan) | |
78f0bacd | 3477 | { |
7972aab2 | 3478 | int ret; |
78f0bacd | 3479 | |
7972aab2 DG |
3480 | assert(app); |
3481 | assert(usess); | |
88e3c2f5 | 3482 | assert(usess->active); |
7972aab2 DG |
3483 | assert(ua_sess); |
3484 | assert(ua_chan); | |
3485 | ||
3486 | /* Handle buffer type before sending the channel to the application. */ | |
3487 | switch (usess->buffer_type) { | |
3488 | case LTTNG_BUFFER_PER_UID: | |
3489 | { | |
3490 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
3491 | if (ret < 0) { | |
3492 | goto error; | |
3493 | } | |
3494 | break; | |
3495 | } | |
3496 | case LTTNG_BUFFER_PER_PID: | |
3497 | { | |
3498 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
3499 | if (ret < 0) { | |
3500 | goto error; | |
3501 | } | |
3502 | break; | |
3503 | } | |
3504 | default: | |
3505 | assert(0); | |
3506 | ret = -EINVAL; | |
78f0bacd DG |
3507 | goto error; |
3508 | } | |
3509 | ||
7972aab2 DG |
3510 | /* Initialize ust objd object using the received handle and add it. */ |
3511 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
3512 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 3513 | |
7972aab2 DG |
3514 | /* If channel is not enabled, disable it on the tracer */ |
3515 | if (!ua_chan->enabled) { | |
3516 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
3517 | if (ret < 0) { | |
3518 | goto error; | |
3519 | } | |
78f0bacd DG |
3520 | } |
3521 | ||
3522 | error: | |
3523 | return ret; | |
3524 | } | |
3525 | ||
284d8f55 | 3526 | /* |
88e3c2f5 | 3527 | * Create UST app channel and return it through ua_chanp if not NULL. |
d0b96690 | 3528 | * |
36b588ed | 3529 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 | 3530 | * |
88e3c2f5 | 3531 | * Return 0 on success or else a negative value. |
284d8f55 | 3532 | */ |
88e3c2f5 JG |
3533 | static int ust_app_channel_allocate(struct ust_app_session *ua_sess, |
3534 | struct ltt_ust_channel *uchan, | |
fc4b93fa | 3535 | enum lttng_ust_abi_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 3536 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
3537 | { |
3538 | int ret = 0; | |
bec39940 DG |
3539 | struct lttng_ht_iter iter; |
3540 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
3541 | struct ust_app_channel *ua_chan; |
3542 | ||
3543 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3544 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
3545 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 3546 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 3547 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 3548 | goto end; |
5b4a0ec0 DG |
3549 | } |
3550 | ||
d0b96690 | 3551 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
3552 | if (ua_chan == NULL) { |
3553 | /* Only malloc can fail here */ | |
4d710ac2 | 3554 | ret = -ENOMEM; |
88e3c2f5 | 3555 | goto error; |
fc34caaa DG |
3556 | } |
3557 | shadow_copy_channel(ua_chan, uchan); | |
3558 | ||
ffe60014 DG |
3559 | /* Set channel type. */ |
3560 | ua_chan->attr.type = type; | |
3561 | ||
d0b96690 DG |
3562 | /* Only add the channel if successful on the tracer side. */ |
3563 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
fc34caaa | 3564 | end: |
4d710ac2 DG |
3565 | if (ua_chanp) { |
3566 | *ua_chanp = ua_chan; | |
3567 | } | |
3568 | ||
3569 | /* Everything went well. */ | |
3570 | return 0; | |
5b4a0ec0 DG |
3571 | |
3572 | error: | |
4d710ac2 | 3573 | return ret; |
5b4a0ec0 DG |
3574 | } |
3575 | ||
3576 | /* | |
3577 | * Create UST app event and create it on the tracer side. | |
d0b96690 | 3578 | * |
993578ff | 3579 | * Must be called with the RCU read side lock held. |
d0b96690 | 3580 | * Called with ust app session mutex held. |
5b4a0ec0 | 3581 | */ |
edb67388 DG |
3582 | static |
3583 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
3584 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
3585 | struct ust_app *app) | |
284d8f55 | 3586 | { |
edb67388 | 3587 | int ret = 0; |
5b4a0ec0 | 3588 | struct ust_app_event *ua_event; |
284d8f55 | 3589 | |
edb67388 DG |
3590 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
3591 | if (ua_event == NULL) { | |
20533947 | 3592 | /* Only failure mode of alloc_ust_app_event(). */ |
edb67388 | 3593 | ret = -ENOMEM; |
fc34caaa | 3594 | goto end; |
5b4a0ec0 | 3595 | } |
edb67388 | 3596 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 3597 | |
edb67388 | 3598 | /* Create it on the tracer side */ |
5b4a0ec0 | 3599 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 3600 | if (ret < 0) { |
e9f11505 JG |
3601 | /* |
3602 | * Not found previously means that it does not exist on the | |
3603 | * tracer. If the application reports that the event existed, | |
3604 | * it means there is a bug in the sessiond or lttng-ust | |
3605 | * (or corruption, etc.) | |
3606 | */ | |
3607 | if (ret == -LTTNG_UST_ERR_EXIST) { | |
3608 | ERR("Tracer for application reported that an event being created already existed: " | |
3609 | "event_name = \"%s\", pid = %d, ppid = %d, uid = %d, gid = %d", | |
3610 | uevent->attr.name, | |
3611 | app->pid, app->ppid, app->uid, | |
3612 | app->gid); | |
3613 | } | |
284d8f55 DG |
3614 | goto error; |
3615 | } | |
3616 | ||
d0b96690 | 3617 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 3618 | |
993578ff JR |
3619 | DBG2("UST app create event completed: app = '%s' (ppid: %d)", |
3620 | app->name, app->ppid); | |
7f79d3a1 | 3621 | |
edb67388 | 3622 | end: |
fc34caaa DG |
3623 | return ret; |
3624 | ||
5b4a0ec0 | 3625 | error: |
fc34caaa | 3626 | /* Valid. Calling here is already in a read side lock */ |
fb45065e | 3627 | delete_ust_app_event(-1, ua_event, app); |
edb67388 | 3628 | return ret; |
5b4a0ec0 DG |
3629 | } |
3630 | ||
993578ff JR |
3631 | /* |
3632 | * Create UST app event notifier rule and create it on the tracer side. | |
3633 | * | |
3634 | * Must be called with the RCU read side lock held. | |
3635 | * Called with ust app session mutex held. | |
3636 | */ | |
3637 | static | |
267d66aa JR |
3638 | int create_ust_app_event_notifier_rule(struct lttng_trigger *trigger, |
3639 | struct ust_app *app) | |
993578ff JR |
3640 | { |
3641 | int ret = 0; | |
3642 | struct ust_app_event_notifier_rule *ua_event_notifier_rule; | |
3643 | ||
267d66aa | 3644 | ua_event_notifier_rule = alloc_ust_app_event_notifier_rule(trigger); |
993578ff JR |
3645 | if (ua_event_notifier_rule == NULL) { |
3646 | ret = -ENOMEM; | |
3647 | goto end; | |
3648 | } | |
3649 | ||
3650 | /* Create it on the tracer side. */ | |
3651 | ret = create_ust_event_notifier(app, ua_event_notifier_rule); | |
3652 | if (ret < 0) { | |
3653 | /* | |
3654 | * Not found previously means that it does not exist on the | |
3655 | * tracer. If the application reports that the event existed, | |
3656 | * it means there is a bug in the sessiond or lttng-ust | |
3657 | * (or corruption, etc.) | |
3658 | */ | |
3659 | if (ret == -LTTNG_UST_ERR_EXIST) { | |
3660 | ERR("Tracer for application reported that an event notifier being created already exists: " | |
3661 | "token = \"%" PRIu64 "\", pid = %d, ppid = %d, uid = %d, gid = %d", | |
267d66aa | 3662 | lttng_trigger_get_tracer_token(trigger), |
993578ff JR |
3663 | app->pid, app->ppid, app->uid, |
3664 | app->gid); | |
3665 | } | |
3666 | goto error; | |
3667 | } | |
3668 | ||
3669 | lttng_ht_add_unique_u64(app->token_to_event_notifier_rule_ht, | |
3670 | &ua_event_notifier_rule->node); | |
3671 | ||
3672 | DBG2("UST app create token event rule completed: app = '%s' (ppid: %d), token = %" PRIu64, | |
267d66aa | 3673 | app->name, app->ppid, lttng_trigger_get_tracer_token(trigger)); |
993578ff JR |
3674 | |
3675 | end: | |
3676 | return ret; | |
3677 | ||
3678 | error: | |
3679 | /* The RCU read side lock is already being held by the caller. */ | |
3680 | delete_ust_app_event_notifier_rule(-1, ua_event_notifier_rule, app); | |
3681 | return ret; | |
3682 | } | |
3683 | ||
5b4a0ec0 DG |
3684 | /* |
3685 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 3686 | * |
7972aab2 | 3687 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
3688 | */ |
3689 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
ad7a9107 | 3690 | struct ust_app *app, struct consumer_output *consumer) |
5b4a0ec0 DG |
3691 | { |
3692 | int ret = 0; | |
ffe60014 | 3693 | struct ust_app_channel *metadata; |
d88aee68 | 3694 | struct consumer_socket *socket; |
7972aab2 | 3695 | struct ust_registry_session *registry; |
e32d7f27 | 3696 | struct ltt_session *session = NULL; |
5b4a0ec0 | 3697 | |
ffe60014 DG |
3698 | assert(ua_sess); |
3699 | assert(app); | |
d88aee68 | 3700 | assert(consumer); |
5b4a0ec0 | 3701 | |
7972aab2 | 3702 | registry = get_session_registry(ua_sess); |
fad1ed2f | 3703 | /* The UST app session is held registry shall not be null. */ |
7972aab2 DG |
3704 | assert(registry); |
3705 | ||
ce34fcd0 MD |
3706 | pthread_mutex_lock(®istry->lock); |
3707 | ||
1b532a60 DG |
3708 | /* Metadata already exists for this registry or it was closed previously */ |
3709 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
3710 | ret = 0; |
3711 | goto error; | |
5b4a0ec0 DG |
3712 | } |
3713 | ||
ffe60014 | 3714 | /* Allocate UST metadata */ |
d0b96690 | 3715 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
3716 | if (!metadata) { |
3717 | /* malloc() failed */ | |
3718 | ret = -ENOMEM; | |
3719 | goto error; | |
3720 | } | |
5b4a0ec0 | 3721 | |
ad7a9107 | 3722 | memcpy(&metadata->attr, &ua_sess->metadata_attr, sizeof(metadata->attr)); |
5b4a0ec0 | 3723 | |
7972aab2 DG |
3724 | /* Need one fd for the channel. */ |
3725 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
3726 | if (ret < 0) { | |
3727 | ERR("Exhausted number of available FD upon create metadata"); | |
3728 | goto error; | |
3729 | } | |
3730 | ||
4dc3dfc5 DG |
3731 | /* Get the right consumer socket for the application. */ |
3732 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
3733 | if (!socket) { | |
3734 | ret = -EINVAL; | |
3735 | goto error_consumer; | |
3736 | } | |
3737 | ||
331744e3 JD |
3738 | /* |
3739 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
3740 | * to the registry *before* we ask the consumer so we avoid the race of the | |
3741 | * consumer requesting the metadata and the ask_channel call on our side | |
3742 | * did not returned yet. | |
3743 | */ | |
3744 | registry->metadata_key = metadata->key; | |
3745 | ||
e098433c JG |
3746 | session = session_find_by_id(ua_sess->tracing_id); |
3747 | assert(session); | |
3748 | ||
3749 | assert(pthread_mutex_trylock(&session->lock)); | |
3750 | assert(session_trylock_list()); | |
3751 | ||
d88aee68 DG |
3752 | /* |
3753 | * Ask the metadata channel creation to the consumer. The metadata object | |
3754 | * will be created by the consumer and kept their. However, the stream is | |
3755 | * never added or monitored until we do a first push metadata to the | |
3756 | * consumer. | |
3757 | */ | |
7972aab2 | 3758 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
d2956687 | 3759 | registry, session->current_trace_chunk); |
d88aee68 | 3760 | if (ret < 0) { |
f2a444f1 DG |
3761 | /* Nullify the metadata key so we don't try to close it later on. */ |
3762 | registry->metadata_key = 0; | |
d88aee68 DG |
3763 | goto error_consumer; |
3764 | } | |
3765 | ||
3766 | /* | |
3767 | * The setup command will make the metadata stream be sent to the relayd, | |
3768 | * if applicable, and the thread managing the metadatas. This is important | |
3769 | * because after this point, if an error occurs, the only way the stream | |
3770 | * can be deleted is to be monitored in the consumer. | |
3771 | */ | |
7972aab2 | 3772 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 3773 | if (ret < 0) { |
f2a444f1 DG |
3774 | /* Nullify the metadata key so we don't try to close it later on. */ |
3775 | registry->metadata_key = 0; | |
d88aee68 | 3776 | goto error_consumer; |
5b4a0ec0 DG |
3777 | } |
3778 | ||
7972aab2 DG |
3779 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
3780 | metadata->key, app->pid); | |
5b4a0ec0 | 3781 | |
d88aee68 | 3782 | error_consumer: |
b80f0b6c | 3783 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 3784 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 3785 | error: |
ce34fcd0 | 3786 | pthread_mutex_unlock(®istry->lock); |
e32d7f27 JG |
3787 | if (session) { |
3788 | session_put(session); | |
3789 | } | |
ffe60014 | 3790 | return ret; |
5b4a0ec0 DG |
3791 | } |
3792 | ||
5b4a0ec0 | 3793 | /* |
d88aee68 DG |
3794 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
3795 | * acquired before calling this function. | |
5b4a0ec0 DG |
3796 | */ |
3797 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
3798 | { | |
d88aee68 | 3799 | struct ust_app *app = NULL; |
bec39940 DG |
3800 | struct lttng_ht_node_ulong *node; |
3801 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 3802 | |
bec39940 DG |
3803 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
3804 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
3805 | if (node == NULL) { |
3806 | DBG2("UST app no found with pid %d", pid); | |
3807 | goto error; | |
3808 | } | |
5b4a0ec0 DG |
3809 | |
3810 | DBG2("Found UST app by pid %d", pid); | |
3811 | ||
d88aee68 | 3812 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
3813 | |
3814 | error: | |
d88aee68 | 3815 | return app; |
5b4a0ec0 DG |
3816 | } |
3817 | ||
d88aee68 DG |
3818 | /* |
3819 | * Allocate and init an UST app object using the registration information and | |
3820 | * the command socket. This is called when the command socket connects to the | |
3821 | * session daemon. | |
3822 | * | |
3823 | * The object is returned on success or else NULL. | |
3824 | */ | |
d0b96690 | 3825 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 3826 | { |
5e2abfaf | 3827 | int ret; |
d0b96690 | 3828 | struct ust_app *lta = NULL; |
da873412 | 3829 | struct lttng_pipe *event_notifier_event_source_pipe = NULL; |
d0b96690 DG |
3830 | |
3831 | assert(msg); | |
3832 | assert(sock >= 0); | |
3833 | ||
3834 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 3835 | |
173af62f DG |
3836 | if ((msg->bits_per_long == 64 && |
3837 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
3838 | || (msg->bits_per_long == 32 && | |
3839 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 3840 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
3841 | "%d-bit long, but no consumerd for this size is available.\n", |
3842 | msg->name, msg->pid, msg->bits_per_long); | |
3843 | goto error; | |
3f2c5fcc | 3844 | } |
d0b96690 | 3845 | |
5e2abfaf JG |
3846 | /* |
3847 | * Reserve the two file descriptors of the event source pipe. The write | |
3848 | * end will be closed once it is passed to the application, at which | |
3849 | * point a single 'put' will be performed. | |
3850 | */ | |
3851 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
3852 | if (ret) { | |
3853 | ERR("Failed to reserve two file descriptors for the event source pipe while creating a new application instance: app = '%s' (ppid: %d)", | |
3854 | msg->name, (int) msg->ppid); | |
3855 | goto error; | |
3856 | } | |
3857 | ||
da873412 JR |
3858 | event_notifier_event_source_pipe = lttng_pipe_open(FD_CLOEXEC); |
3859 | if (!event_notifier_event_source_pipe) { | |
3860 | PERROR("Failed to open application event source pipe: '%s' (ppid = %d)", | |
3861 | msg->name, msg->ppid); | |
3862 | goto error; | |
3863 | } | |
3864 | ||
5b4a0ec0 DG |
3865 | lta = zmalloc(sizeof(struct ust_app)); |
3866 | if (lta == NULL) { | |
3867 | PERROR("malloc"); | |
da873412 | 3868 | goto error_free_pipe; |
5b4a0ec0 DG |
3869 | } |
3870 | ||
da873412 JR |
3871 | lta->event_notifier_group.event_pipe = event_notifier_event_source_pipe; |
3872 | ||
5b4a0ec0 DG |
3873 | lta->ppid = msg->ppid; |
3874 | lta->uid = msg->uid; | |
3875 | lta->gid = msg->gid; | |
d0b96690 | 3876 | |
7753dea8 | 3877 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
3878 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
3879 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
3880 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
3881 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
3882 | lta->long_alignment = msg->long_alignment; | |
3883 | lta->byte_order = msg->byte_order; | |
3884 | ||
5b4a0ec0 DG |
3885 | lta->v_major = msg->major; |
3886 | lta->v_minor = msg->minor; | |
d9bf3ca4 | 3887 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 | 3888 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
10b56aef | 3889 | lta->ust_sessions_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3890 | lta->notify_sock = -1; |
993578ff | 3891 | lta->token_to_event_notifier_rule_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d88aee68 DG |
3892 | |
3893 | /* Copy name and make sure it's NULL terminated. */ | |
3894 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
3895 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
3896 | ||
3897 | /* | |
3898 | * Before this can be called, when receiving the registration information, | |
3899 | * the application compatibility is checked. So, at this point, the | |
3900 | * application can work with this session daemon. | |
3901 | */ | |
d0b96690 | 3902 | lta->compatible = 1; |
5b4a0ec0 | 3903 | |
852d0037 | 3904 | lta->pid = msg->pid; |
d0b96690 | 3905 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 3906 | lta->sock = sock; |
fb45065e | 3907 | pthread_mutex_init(<a->sock_lock, NULL); |
d0b96690 | 3908 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 3909 | |
d42f20df | 3910 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
d0b96690 | 3911 | return lta; |
da873412 JR |
3912 | |
3913 | error_free_pipe: | |
3914 | lttng_pipe_destroy(event_notifier_event_source_pipe); | |
5e2abfaf | 3915 | lttng_fd_put(LTTNG_FD_APPS, 2); |
da873412 JR |
3916 | error: |
3917 | return NULL; | |
d0b96690 DG |
3918 | } |
3919 | ||
d88aee68 DG |
3920 | /* |
3921 | * For a given application object, add it to every hash table. | |
3922 | */ | |
d0b96690 DG |
3923 | void ust_app_add(struct ust_app *app) |
3924 | { | |
3925 | assert(app); | |
3926 | assert(app->notify_sock >= 0); | |
3927 | ||
940c4592 JR |
3928 | app->registration_time = time(NULL); |
3929 | ||
5b4a0ec0 | 3930 | rcu_read_lock(); |
852d0037 DG |
3931 | |
3932 | /* | |
3933 | * On a re-registration, we want to kick out the previous registration of | |
3934 | * that pid | |
3935 | */ | |
d0b96690 | 3936 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
3937 | |
3938 | /* | |
3939 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
3940 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
3941 | * already in the table. | |
3942 | */ | |
d0b96690 | 3943 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 3944 | |
d0b96690 DG |
3945 | /* Add application to the notify socket hash table. */ |
3946 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
3947 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 3948 | |
d0b96690 | 3949 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
3950 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
3951 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
3952 | app->v_minor); | |
5b4a0ec0 | 3953 | |
d0b96690 DG |
3954 | rcu_read_unlock(); |
3955 | } | |
3956 | ||
d88aee68 DG |
3957 | /* |
3958 | * Set the application version into the object. | |
3959 | * | |
3960 | * Return 0 on success else a negative value either an errno code or a | |
3961 | * LTTng-UST error code. | |
3962 | */ | |
d0b96690 DG |
3963 | int ust_app_version(struct ust_app *app) |
3964 | { | |
d88aee68 DG |
3965 | int ret; |
3966 | ||
d0b96690 | 3967 | assert(app); |
d88aee68 | 3968 | |
fb45065e | 3969 | pthread_mutex_lock(&app->sock_lock); |
d88aee68 | 3970 | ret = ustctl_tracer_version(app->sock, &app->version); |
fb45065e | 3971 | pthread_mutex_unlock(&app->sock_lock); |
d88aee68 DG |
3972 | if (ret < 0) { |
3973 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
5368d366 | 3974 | ERR("UST app %d version failed with ret %d", app->sock, ret); |
d88aee68 | 3975 | } else { |
5368d366 | 3976 | DBG3("UST app %d version failed. Application is dead", app->sock); |
d88aee68 DG |
3977 | } |
3978 | } | |
3979 | ||
3980 | return ret; | |
5b4a0ec0 DG |
3981 | } |
3982 | ||
da873412 JR |
3983 | /* |
3984 | * Setup the base event notifier group. | |
3985 | * | |
3986 | * Return 0 on success else a negative value either an errno code or a | |
3987 | * LTTng-UST error code. | |
3988 | */ | |
3989 | int ust_app_setup_event_notifier_group(struct ust_app *app) | |
3990 | { | |
3991 | int ret; | |
3992 | int event_pipe_write_fd; | |
fc4b93fa | 3993 | struct lttng_ust_abi_object_data *event_notifier_group = NULL; |
da873412 JR |
3994 | enum lttng_error_code lttng_ret; |
3995 | ||
3996 | assert(app); | |
3997 | ||
3998 | /* Get the write side of the pipe. */ | |
3999 | event_pipe_write_fd = lttng_pipe_get_writefd( | |
4000 | app->event_notifier_group.event_pipe); | |
4001 | ||
4002 | pthread_mutex_lock(&app->sock_lock); | |
4003 | ret = ustctl_create_event_notifier_group(app->sock, | |
4004 | event_pipe_write_fd, &event_notifier_group); | |
4005 | pthread_mutex_unlock(&app->sock_lock); | |
4006 | if (ret < 0) { | |
4007 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
4008 | ERR("Failed to create application event notifier group: ret = %d, app socket fd = %d, event_pipe_write_fd = %d", | |
4009 | ret, app->sock, event_pipe_write_fd); | |
4010 | } else { | |
4011 | DBG("Failed to create application event notifier group (application is dead): app socket fd = %d", | |
4012 | app->sock); | |
4013 | } | |
4014 | ||
4015 | goto error; | |
4016 | } | |
4017 | ||
5d4193fd JG |
4018 | ret = lttng_pipe_write_close(app->event_notifier_group.event_pipe); |
4019 | if (ret) { | |
4020 | ERR("Failed to close write end of the application's event source pipe: app = '%s' (ppid = %d)", | |
4021 | app->name, app->ppid); | |
4022 | goto error; | |
4023 | } | |
4024 | ||
5e2abfaf JG |
4025 | /* |
4026 | * Release the file descriptor that was reserved for the write-end of | |
4027 | * the pipe. | |
4028 | */ | |
4029 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
4030 | ||
da873412 JR |
4031 | lttng_ret = notification_thread_command_add_tracer_event_source( |
4032 | notification_thread_handle, | |
4033 | lttng_pipe_get_readfd(app->event_notifier_group.event_pipe), | |
4034 | LTTNG_DOMAIN_UST); | |
4035 | if (lttng_ret != LTTNG_OK) { | |
4036 | ERR("Failed to add tracer event source to notification thread"); | |
4037 | ret = - 1; | |
4038 | goto error; | |
4039 | } | |
4040 | ||
4041 | /* Assign handle only when the complete setup is valid. */ | |
4042 | app->event_notifier_group.object = event_notifier_group; | |
4043 | return ret; | |
4044 | ||
4045 | error: | |
4046 | ustctl_release_object(app->sock, app->event_notifier_group.object); | |
4047 | free(app->event_notifier_group.object); | |
4048 | return ret; | |
4049 | } | |
4050 | ||
5b4a0ec0 DG |
4051 | /* |
4052 | * Unregister app by removing it from the global traceable app list and freeing | |
4053 | * the data struct. | |
4054 | * | |
4055 | * The socket is already closed at this point so no close to sock. | |
4056 | */ | |
4057 | void ust_app_unregister(int sock) | |
4058 | { | |
4059 | struct ust_app *lta; | |
bec39940 | 4060 | struct lttng_ht_node_ulong *node; |
c4b88406 | 4061 | struct lttng_ht_iter ust_app_sock_iter; |
bec39940 | 4062 | struct lttng_ht_iter iter; |
d42f20df | 4063 | struct ust_app_session *ua_sess; |
525b0740 | 4064 | int ret; |
5b4a0ec0 DG |
4065 | |
4066 | rcu_read_lock(); | |
886459c6 | 4067 | |
5b4a0ec0 | 4068 | /* Get the node reference for a call_rcu */ |
c4b88406 MD |
4069 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &ust_app_sock_iter); |
4070 | node = lttng_ht_iter_get_node_ulong(&ust_app_sock_iter); | |
d0b96690 | 4071 | assert(node); |
284d8f55 | 4072 | |
852d0037 | 4073 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
4074 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
4075 | ||
d88aee68 | 4076 | /* |
ce34fcd0 MD |
4077 | * For per-PID buffers, perform "push metadata" and flush all |
4078 | * application streams before removing app from hash tables, | |
4079 | * ensuring proper behavior of data_pending check. | |
c4b88406 | 4080 | * Remove sessions so they are not visible during deletion. |
d88aee68 | 4081 | */ |
d42f20df DG |
4082 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, |
4083 | node.node) { | |
7972aab2 DG |
4084 | struct ust_registry_session *registry; |
4085 | ||
d42f20df DG |
4086 | ret = lttng_ht_del(lta->sessions, &iter); |
4087 | if (ret) { | |
4088 | /* The session was already removed so scheduled for teardown. */ | |
4089 | continue; | |
4090 | } | |
4091 | ||
ce34fcd0 MD |
4092 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { |
4093 | (void) ust_app_flush_app_session(lta, ua_sess); | |
4094 | } | |
c4b88406 | 4095 | |
d42f20df DG |
4096 | /* |
4097 | * Add session to list for teardown. This is safe since at this point we | |
4098 | * are the only one using this list. | |
4099 | */ | |
d88aee68 DG |
4100 | pthread_mutex_lock(&ua_sess->lock); |
4101 | ||
b161602a MD |
4102 | if (ua_sess->deleted) { |
4103 | pthread_mutex_unlock(&ua_sess->lock); | |
4104 | continue; | |
4105 | } | |
4106 | ||
d88aee68 DG |
4107 | /* |
4108 | * Normally, this is done in the delete session process which is | |
4109 | * executed in the call rcu below. However, upon registration we can't | |
4110 | * afford to wait for the grace period before pushing data or else the | |
4111 | * data pending feature can race between the unregistration and stop | |
4112 | * command where the data pending command is sent *before* the grace | |
4113 | * period ended. | |
4114 | * | |
4115 | * The close metadata below nullifies the metadata pointer in the | |
4116 | * session so the delete session will NOT push/close a second time. | |
4117 | */ | |
7972aab2 | 4118 | registry = get_session_registry(ua_sess); |
ce34fcd0 | 4119 | if (registry) { |
7972aab2 DG |
4120 | /* Push metadata for application before freeing the application. */ |
4121 | (void) push_metadata(registry, ua_sess->consumer); | |
4122 | ||
4123 | /* | |
4124 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
4125 | * metadata only on destroy trace session in this case. Also, the |
4126 | * previous push metadata could have flag the metadata registry to | |
4127 | * close so don't send a close command if closed. | |
7972aab2 | 4128 | */ |
ce34fcd0 | 4129 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
4130 | /* And ask to close it for this session registry. */ |
4131 | (void) close_metadata(registry, ua_sess->consumer); | |
4132 | } | |
4133 | } | |
d42f20df | 4134 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
c4b88406 | 4135 | |
d88aee68 | 4136 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
4137 | } |
4138 | ||
c4b88406 MD |
4139 | /* Remove application from PID hash table */ |
4140 | ret = lttng_ht_del(ust_app_ht_by_sock, &ust_app_sock_iter); | |
4141 | assert(!ret); | |
4142 | ||
4143 | /* | |
4144 | * Remove application from notify hash table. The thread handling the | |
4145 | * notify socket could have deleted the node so ignore on error because | |
c48239ca JG |
4146 | * either way it's valid. The close of that socket is handled by the |
4147 | * apps_notify_thread. | |
c4b88406 MD |
4148 | */ |
4149 | iter.iter.node = <a->notify_sock_n.node; | |
4150 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
4151 | ||
4152 | /* | |
4153 | * Ignore return value since the node might have been removed before by an | |
4154 | * add replace during app registration because the PID can be reassigned by | |
4155 | * the OS. | |
4156 | */ | |
4157 | iter.iter.node = <a->pid_n.node; | |
4158 | ret = lttng_ht_del(ust_app_ht, &iter); | |
4159 | if (ret) { | |
4160 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
4161 | lta->pid); | |
4162 | } | |
4163 | ||
852d0037 DG |
4164 | /* Free memory */ |
4165 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
4166 | ||
5b4a0ec0 DG |
4167 | rcu_read_unlock(); |
4168 | return; | |
284d8f55 DG |
4169 | } |
4170 | ||
5b4a0ec0 DG |
4171 | /* |
4172 | * Fill events array with all events name of all registered apps. | |
4173 | */ | |
4174 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 4175 | { |
5b4a0ec0 DG |
4176 | int ret, handle; |
4177 | size_t nbmem, count = 0; | |
bec39940 | 4178 | struct lttng_ht_iter iter; |
5b4a0ec0 | 4179 | struct ust_app *app; |
c617c0c6 | 4180 | struct lttng_event *tmp_event; |
421cb601 | 4181 | |
5b4a0ec0 | 4182 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
4183 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
4184 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
4185 | PERROR("zmalloc ust app events"); |
4186 | ret = -ENOMEM; | |
421cb601 DG |
4187 | goto error; |
4188 | } | |
4189 | ||
5b4a0ec0 | 4190 | rcu_read_lock(); |
421cb601 | 4191 | |
852d0037 | 4192 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
fc4b93fa | 4193 | struct lttng_ust_abi_tracepoint_iter uiter; |
ac3bd9c0 | 4194 | |
840cb59c | 4195 | health_code_update(); |
86acf0da | 4196 | |
e0c7ec2b DG |
4197 | if (!app->compatible) { |
4198 | /* | |
4199 | * TODO: In time, we should notice the caller of this error by | |
4200 | * telling him that this is a version error. | |
4201 | */ | |
4202 | continue; | |
4203 | } | |
fb45065e | 4204 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4205 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 4206 | if (handle < 0) { |
ffe60014 DG |
4207 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
4208 | ERR("UST app list events getting handle failed for app pid %d", | |
4209 | app->pid); | |
4210 | } | |
fb45065e | 4211 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 DG |
4212 | continue; |
4213 | } | |
421cb601 | 4214 | |
852d0037 | 4215 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 4216 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
4217 | /* Handle ustctl error. */ |
4218 | if (ret < 0) { | |
fb45065e MD |
4219 | int release_ret; |
4220 | ||
a2ba1ab0 | 4221 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
4222 | ERR("UST app tp list get failed for app %d with ret %d", |
4223 | app->sock, ret); | |
4224 | } else { | |
4225 | DBG3("UST app tp list get failed. Application is dead"); | |
3757b385 DG |
4226 | /* |
4227 | * This is normal behavior, an application can die during the | |
4228 | * creation process. Don't report an error so the execution can | |
4229 | * continue normally. Continue normal execution. | |
4230 | */ | |
4231 | break; | |
ffe60014 | 4232 | } |
98f595d4 | 4233 | free(tmp_event); |
fb45065e | 4234 | release_ret = ustctl_release_handle(app->sock, handle); |
68313703 JG |
4235 | if (release_ret < 0 && |
4236 | release_ret != -LTTNG_UST_ERR_EXITING && | |
4237 | release_ret != -EPIPE) { | |
fb45065e MD |
4238 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
4239 | } | |
4240 | pthread_mutex_unlock(&app->sock_lock); | |
ffe60014 DG |
4241 | goto rcu_error; |
4242 | } | |
4243 | ||
840cb59c | 4244 | health_code_update(); |
815564d8 | 4245 | if (count >= nbmem) { |
d7b3776f | 4246 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
4247 | struct lttng_event *new_tmp_event; |
4248 | size_t new_nbmem; | |
4249 | ||
4250 | new_nbmem = nbmem << 1; | |
4251 | DBG2("Reallocating event list from %zu to %zu entries", | |
4252 | nbmem, new_nbmem); | |
4253 | new_tmp_event = realloc(tmp_event, | |
4254 | new_nbmem * sizeof(struct lttng_event)); | |
4255 | if (new_tmp_event == NULL) { | |
fb45065e MD |
4256 | int release_ret; |
4257 | ||
5b4a0ec0 | 4258 | PERROR("realloc ust app events"); |
c617c0c6 | 4259 | free(tmp_event); |
5b4a0ec0 | 4260 | ret = -ENOMEM; |
fb45065e | 4261 | release_ret = ustctl_release_handle(app->sock, handle); |
68313703 JG |
4262 | if (release_ret < 0 && |
4263 | release_ret != -LTTNG_UST_ERR_EXITING && | |
4264 | release_ret != -EPIPE) { | |
fb45065e MD |
4265 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
4266 | } | |
4267 | pthread_mutex_unlock(&app->sock_lock); | |
5b4a0ec0 DG |
4268 | goto rcu_error; |
4269 | } | |
53efb85a MD |
4270 | /* Zero the new memory */ |
4271 | memset(new_tmp_event + nbmem, 0, | |
4272 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
4273 | nbmem = new_nbmem; | |
4274 | tmp_event = new_tmp_event; | |
5b4a0ec0 | 4275 | } |
fc4b93fa | 4276 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_ABI_SYM_NAME_LEN); |
c617c0c6 | 4277 | tmp_event[count].loglevel = uiter.loglevel; |
fc4b93fa | 4278 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_ABI_TRACEPOINT; |
c617c0c6 MD |
4279 | tmp_event[count].pid = app->pid; |
4280 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 4281 | count++; |
421cb601 | 4282 | } |
fb45065e MD |
4283 | ret = ustctl_release_handle(app->sock, handle); |
4284 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 | 4285 | if (ret < 0 && ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
fb45065e MD |
4286 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
4287 | } | |
421cb601 DG |
4288 | } |
4289 | ||
5b4a0ec0 | 4290 | ret = count; |
c617c0c6 | 4291 | *events = tmp_event; |
421cb601 | 4292 | |
5b4a0ec0 | 4293 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 4294 | |
5b4a0ec0 DG |
4295 | rcu_error: |
4296 | rcu_read_unlock(); | |
421cb601 | 4297 | error: |
840cb59c | 4298 | health_code_update(); |
5b4a0ec0 | 4299 | return ret; |
421cb601 DG |
4300 | } |
4301 | ||
f37d259d MD |
4302 | /* |
4303 | * Fill events array with all events name of all registered apps. | |
4304 | */ | |
4305 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
4306 | { | |
4307 | int ret, handle; | |
4308 | size_t nbmem, count = 0; | |
4309 | struct lttng_ht_iter iter; | |
4310 | struct ust_app *app; | |
c617c0c6 | 4311 | struct lttng_event_field *tmp_event; |
f37d259d MD |
4312 | |
4313 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
4314 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
4315 | if (tmp_event == NULL) { | |
f37d259d MD |
4316 | PERROR("zmalloc ust app event fields"); |
4317 | ret = -ENOMEM; | |
4318 | goto error; | |
4319 | } | |
4320 | ||
4321 | rcu_read_lock(); | |
4322 | ||
4323 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
fc4b93fa | 4324 | struct lttng_ust_abi_field_iter uiter; |
f37d259d | 4325 | |
840cb59c | 4326 | health_code_update(); |
86acf0da | 4327 | |
f37d259d MD |
4328 | if (!app->compatible) { |
4329 | /* | |
4330 | * TODO: In time, we should notice the caller of this error by | |
4331 | * telling him that this is a version error. | |
4332 | */ | |
4333 | continue; | |
4334 | } | |
fb45065e | 4335 | pthread_mutex_lock(&app->sock_lock); |
f37d259d MD |
4336 | handle = ustctl_tracepoint_field_list(app->sock); |
4337 | if (handle < 0) { | |
ffe60014 DG |
4338 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
4339 | ERR("UST app list field getting handle failed for app pid %d", | |
4340 | app->pid); | |
4341 | } | |
fb45065e | 4342 | pthread_mutex_unlock(&app->sock_lock); |
f37d259d MD |
4343 | continue; |
4344 | } | |
4345 | ||
4346 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 4347 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
4348 | /* Handle ustctl error. */ |
4349 | if (ret < 0) { | |
fb45065e MD |
4350 | int release_ret; |
4351 | ||
a2ba1ab0 | 4352 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
4353 | ERR("UST app tp list field failed for app %d with ret %d", |
4354 | app->sock, ret); | |
4355 | } else { | |
4356 | DBG3("UST app tp list field failed. Application is dead"); | |
3757b385 DG |
4357 | /* |
4358 | * This is normal behavior, an application can die during the | |
4359 | * creation process. Don't report an error so the execution can | |
98f595d4 | 4360 | * continue normally. Reset list and count for next app. |
3757b385 DG |
4361 | */ |
4362 | break; | |
ffe60014 | 4363 | } |
98f595d4 | 4364 | free(tmp_event); |
fb45065e MD |
4365 | release_ret = ustctl_release_handle(app->sock, handle); |
4366 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
4367 | if (release_ret < 0 && |
4368 | release_ret != -LTTNG_UST_ERR_EXITING && | |
4369 | release_ret != -EPIPE) { | |
fb45065e MD |
4370 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
4371 | } | |
ffe60014 DG |
4372 | goto rcu_error; |
4373 | } | |
4374 | ||
840cb59c | 4375 | health_code_update(); |
f37d259d | 4376 | if (count >= nbmem) { |
d7b3776f | 4377 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
4378 | struct lttng_event_field *new_tmp_event; |
4379 | size_t new_nbmem; | |
4380 | ||
4381 | new_nbmem = nbmem << 1; | |
4382 | DBG2("Reallocating event field list from %zu to %zu entries", | |
4383 | nbmem, new_nbmem); | |
4384 | new_tmp_event = realloc(tmp_event, | |
4385 | new_nbmem * sizeof(struct lttng_event_field)); | |
4386 | if (new_tmp_event == NULL) { | |
fb45065e MD |
4387 | int release_ret; |
4388 | ||
f37d259d | 4389 | PERROR("realloc ust app event fields"); |
c617c0c6 | 4390 | free(tmp_event); |
f37d259d | 4391 | ret = -ENOMEM; |
fb45065e MD |
4392 | release_ret = ustctl_release_handle(app->sock, handle); |
4393 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
4394 | if (release_ret && |
4395 | release_ret != -LTTNG_UST_ERR_EXITING && | |
4396 | release_ret != -EPIPE) { | |
fb45065e MD |
4397 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
4398 | } | |
f37d259d MD |
4399 | goto rcu_error; |
4400 | } | |
53efb85a MD |
4401 | /* Zero the new memory */ |
4402 | memset(new_tmp_event + nbmem, 0, | |
4403 | (new_nbmem - nbmem) * sizeof(struct lttng_event_field)); | |
4404 | nbmem = new_nbmem; | |
4405 | tmp_event = new_tmp_event; | |
f37d259d | 4406 | } |
f37d259d | 4407 | |
fc4b93fa | 4408 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_ABI_SYM_NAME_LEN); |
2e84128e DG |
4409 | /* Mapping between these enums matches 1 to 1. */ |
4410 | tmp_event[count].type = (enum lttng_event_field_type) uiter.type; | |
c617c0c6 | 4411 | tmp_event[count].nowrite = uiter.nowrite; |
f37d259d | 4412 | |
fc4b93fa | 4413 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_ABI_SYM_NAME_LEN); |
c617c0c6 | 4414 | tmp_event[count].event.loglevel = uiter.loglevel; |
2e84128e | 4415 | tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; |
c617c0c6 MD |
4416 | tmp_event[count].event.pid = app->pid; |
4417 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
4418 | count++; |
4419 | } | |
fb45065e MD |
4420 | ret = ustctl_release_handle(app->sock, handle); |
4421 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
4422 | if (ret < 0 && |
4423 | ret != -LTTNG_UST_ERR_EXITING && | |
4424 | ret != -EPIPE) { | |
fb45065e MD |
4425 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
4426 | } | |
f37d259d MD |
4427 | } |
4428 | ||
4429 | ret = count; | |
c617c0c6 | 4430 | *fields = tmp_event; |
f37d259d MD |
4431 | |
4432 | DBG2("UST app list event fields done (%zu events)", count); | |
4433 | ||
4434 | rcu_error: | |
4435 | rcu_read_unlock(); | |
4436 | error: | |
840cb59c | 4437 | health_code_update(); |
f37d259d MD |
4438 | return ret; |
4439 | } | |
4440 | ||
5b4a0ec0 DG |
4441 | /* |
4442 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
4443 | * |
4444 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
4445 | */ |
4446 | void ust_app_clean_list(void) | |
421cb601 | 4447 | { |
5b4a0ec0 | 4448 | int ret; |
659ed79f | 4449 | struct ust_app *app; |
bec39940 | 4450 | struct lttng_ht_iter iter; |
421cb601 | 4451 | |
5b4a0ec0 | 4452 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 4453 | |
5b4a0ec0 | 4454 | rcu_read_lock(); |
421cb601 | 4455 | |
faadaa3a JG |
4456 | /* Cleanup notify socket hash table */ |
4457 | if (ust_app_ht_by_notify_sock) { | |
4458 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
4459 | notify_sock_n.node) { | |
b69a1b40 JG |
4460 | /* |
4461 | * Assert that all notifiers are gone as all triggers | |
4462 | * are unregistered prior to this clean-up. | |
4463 | */ | |
4464 | assert(lttng_ht_get_count(app->token_to_event_notifier_rule_ht) == 0); | |
faadaa3a | 4465 | |
faadaa3a JG |
4466 | ust_app_notify_sock_unregister(app->notify_sock); |
4467 | } | |
4468 | } | |
4469 | ||
f1b711c4 MD |
4470 | if (ust_app_ht) { |
4471 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4472 | ret = lttng_ht_del(ust_app_ht, &iter); | |
4473 | assert(!ret); | |
4474 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
4475 | } | |
421cb601 DG |
4476 | } |
4477 | ||
852d0037 | 4478 | /* Cleanup socket hash table */ |
f1b711c4 MD |
4479 | if (ust_app_ht_by_sock) { |
4480 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, | |
4481 | sock_n.node) { | |
4482 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); | |
4483 | assert(!ret); | |
4484 | } | |
bec39940 | 4485 | } |
852d0037 | 4486 | |
36b588ed | 4487 | rcu_read_unlock(); |
d88aee68 | 4488 | |
bec39940 | 4489 | /* Destroy is done only when the ht is empty */ |
f1b711c4 MD |
4490 | if (ust_app_ht) { |
4491 | ht_cleanup_push(ust_app_ht); | |
4492 | } | |
4493 | if (ust_app_ht_by_sock) { | |
4494 | ht_cleanup_push(ust_app_ht_by_sock); | |
4495 | } | |
4496 | if (ust_app_ht_by_notify_sock) { | |
4497 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
4498 | } | |
5b4a0ec0 DG |
4499 | } |
4500 | ||
4501 | /* | |
4502 | * Init UST app hash table. | |
4503 | */ | |
57703f6e | 4504 | int ust_app_ht_alloc(void) |
5b4a0ec0 | 4505 | { |
bec39940 | 4506 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
4507 | if (!ust_app_ht) { |
4508 | return -1; | |
4509 | } | |
852d0037 | 4510 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
4511 | if (!ust_app_ht_by_sock) { |
4512 | return -1; | |
4513 | } | |
d0b96690 | 4514 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
4515 | if (!ust_app_ht_by_notify_sock) { |
4516 | return -1; | |
4517 | } | |
4518 | return 0; | |
421cb601 DG |
4519 | } |
4520 | ||
78f0bacd DG |
4521 | /* |
4522 | * For a specific UST session, disable the channel for all registered apps. | |
4523 | */ | |
35a9059d | 4524 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
4525 | struct ltt_ust_channel *uchan) |
4526 | { | |
4527 | int ret = 0; | |
bec39940 DG |
4528 | struct lttng_ht_iter iter; |
4529 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
4530 | struct ust_app *app; |
4531 | struct ust_app_session *ua_sess; | |
8535a6d9 | 4532 | struct ust_app_channel *ua_chan; |
78f0bacd | 4533 | |
88e3c2f5 | 4534 | assert(usess->active); |
d9bf3ca4 | 4535 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 4536 | uchan->name, usess->id); |
78f0bacd DG |
4537 | |
4538 | rcu_read_lock(); | |
4539 | ||
4540 | /* For every registered applications */ | |
852d0037 | 4541 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 4542 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
4543 | if (!app->compatible) { |
4544 | /* | |
4545 | * TODO: In time, we should notice the caller of this error by | |
4546 | * telling him that this is a version error. | |
4547 | */ | |
4548 | continue; | |
4549 | } | |
78f0bacd DG |
4550 | ua_sess = lookup_session_by_app(usess, app); |
4551 | if (ua_sess == NULL) { | |
4552 | continue; | |
4553 | } | |
4554 | ||
8535a6d9 | 4555 | /* Get channel */ |
bec39940 DG |
4556 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4557 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
4558 | /* If the session if found for the app, the channel must be there */ |
4559 | assert(ua_chan_node); | |
4560 | ||
4561 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4562 | /* The channel must not be already disabled */ | |
4563 | assert(ua_chan->enabled == 1); | |
4564 | ||
4565 | /* Disable channel onto application */ | |
4566 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
4567 | if (ret < 0) { |
4568 | /* XXX: We might want to report this error at some point... */ | |
4569 | continue; | |
4570 | } | |
4571 | } | |
4572 | ||
4573 | rcu_read_unlock(); | |
78f0bacd DG |
4574 | return ret; |
4575 | } | |
4576 | ||
4577 | /* | |
4578 | * For a specific UST session, enable the channel for all registered apps. | |
4579 | */ | |
35a9059d | 4580 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
4581 | struct ltt_ust_channel *uchan) |
4582 | { | |
4583 | int ret = 0; | |
bec39940 | 4584 | struct lttng_ht_iter iter; |
78f0bacd DG |
4585 | struct ust_app *app; |
4586 | struct ust_app_session *ua_sess; | |
4587 | ||
88e3c2f5 | 4588 | assert(usess->active); |
d9bf3ca4 | 4589 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 4590 | uchan->name, usess->id); |
78f0bacd DG |
4591 | |
4592 | rcu_read_lock(); | |
4593 | ||
4594 | /* For every registered applications */ | |
852d0037 | 4595 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4596 | if (!app->compatible) { |
4597 | /* | |
4598 | * TODO: In time, we should notice the caller of this error by | |
4599 | * telling him that this is a version error. | |
4600 | */ | |
4601 | continue; | |
4602 | } | |
78f0bacd DG |
4603 | ua_sess = lookup_session_by_app(usess, app); |
4604 | if (ua_sess == NULL) { | |
4605 | continue; | |
4606 | } | |
4607 | ||
4608 | /* Enable channel onto application */ | |
4609 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
4610 | if (ret < 0) { | |
4611 | /* XXX: We might want to report this error at some point... */ | |
4612 | continue; | |
4613 | } | |
4614 | } | |
4615 | ||
4616 | rcu_read_unlock(); | |
78f0bacd DG |
4617 | return ret; |
4618 | } | |
4619 | ||
b0a40d28 DG |
4620 | /* |
4621 | * Disable an event in a channel and for a specific session. | |
4622 | */ | |
35a9059d DG |
4623 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
4624 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
4625 | { |
4626 | int ret = 0; | |
bec39940 | 4627 | struct lttng_ht_iter iter, uiter; |
700c5a9d | 4628 | struct lttng_ht_node_str *ua_chan_node; |
b0a40d28 DG |
4629 | struct ust_app *app; |
4630 | struct ust_app_session *ua_sess; | |
4631 | struct ust_app_channel *ua_chan; | |
4632 | struct ust_app_event *ua_event; | |
4633 | ||
88e3c2f5 | 4634 | assert(usess->active); |
b0a40d28 | 4635 | DBG("UST app disabling event %s for all apps in channel " |
d9bf3ca4 MD |
4636 | "%s for session id %" PRIu64, |
4637 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
4638 | |
4639 | rcu_read_lock(); | |
4640 | ||
4641 | /* For all registered applications */ | |
852d0037 | 4642 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4643 | if (!app->compatible) { |
4644 | /* | |
4645 | * TODO: In time, we should notice the caller of this error by | |
4646 | * telling him that this is a version error. | |
4647 | */ | |
4648 | continue; | |
4649 | } | |
b0a40d28 DG |
4650 | ua_sess = lookup_session_by_app(usess, app); |
4651 | if (ua_sess == NULL) { | |
4652 | /* Next app */ | |
4653 | continue; | |
4654 | } | |
4655 | ||
4656 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
4657 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4658 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 4659 | if (ua_chan_node == NULL) { |
d9bf3ca4 | 4660 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 4661 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
4662 | continue; |
4663 | } | |
4664 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4665 | ||
700c5a9d JR |
4666 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
4667 | uevent->filter, uevent->attr.loglevel, | |
4668 | uevent->exclusion); | |
4669 | if (ua_event == NULL) { | |
b0a40d28 | 4670 | DBG2("Event %s not found in channel %s for app pid %d." |
852d0037 | 4671 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
4672 | continue; |
4673 | } | |
b0a40d28 | 4674 | |
7f79d3a1 | 4675 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
4676 | if (ret < 0) { |
4677 | /* XXX: Report error someday... */ | |
4678 | continue; | |
4679 | } | |
4680 | } | |
4681 | ||
4682 | rcu_read_unlock(); | |
88e3c2f5 JG |
4683 | return ret; |
4684 | } | |
4685 | ||
4686 | /* The ua_sess lock must be held by the caller. */ | |
4687 | static | |
4688 | int ust_app_channel_create(struct ltt_ust_session *usess, | |
4689 | struct ust_app_session *ua_sess, | |
4690 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
4691 | struct ust_app_channel **_ua_chan) | |
4692 | { | |
4693 | int ret = 0; | |
4694 | struct ust_app_channel *ua_chan = NULL; | |
4695 | ||
4696 | assert(ua_sess); | |
4697 | ASSERT_LOCKED(ua_sess->lock); | |
4698 | ||
4699 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, | |
4700 | sizeof(uchan->name))) { | |
4701 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, | |
4702 | &uchan->attr); | |
4703 | ret = 0; | |
4704 | } else { | |
4705 | struct ltt_ust_context *uctx = NULL; | |
4706 | ||
4707 | /* | |
4708 | * Create channel onto application and synchronize its | |
4709 | * configuration. | |
4710 | */ | |
4711 | ret = ust_app_channel_allocate(ua_sess, uchan, | |
fc4b93fa | 4712 | LTTNG_UST_ABI_CHAN_PER_CPU, usess, |
88e3c2f5 | 4713 | &ua_chan); |
88ebf5a7 JR |
4714 | if (ret < 0) { |
4715 | goto error; | |
4716 | } | |
4717 | ||
4718 | ret = ust_app_channel_send(app, usess, | |
4719 | ua_sess, ua_chan); | |
4720 | if (ret) { | |
4721 | goto error; | |
88e3c2f5 JG |
4722 | } |
4723 | ||
4724 | /* Add contexts. */ | |
4725 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { | |
4726 | ret = create_ust_app_channel_context(ua_chan, | |
4727 | &uctx->ctx, app); | |
4728 | if (ret) { | |
88ebf5a7 | 4729 | goto error; |
88e3c2f5 JG |
4730 | } |
4731 | } | |
4732 | } | |
88ebf5a7 JR |
4733 | |
4734 | error: | |
88e3c2f5 JG |
4735 | if (ret < 0) { |
4736 | switch (ret) { | |
4737 | case -ENOTCONN: | |
4738 | /* | |
4739 | * The application's socket is not valid. Either a bad socket | |
4740 | * or a timeout on it. We can't inform the caller that for a | |
4741 | * specific app, the session failed so lets continue here. | |
4742 | */ | |
4743 | ret = 0; /* Not an error. */ | |
4744 | break; | |
4745 | case -ENOMEM: | |
4746 | default: | |
4747 | break; | |
4748 | } | |
4749 | } | |
88ebf5a7 | 4750 | |
88e3c2f5 JG |
4751 | if (ret == 0 && _ua_chan) { |
4752 | /* | |
4753 | * Only return the application's channel on success. Note | |
4754 | * that the channel can still be part of the application's | |
4755 | * channel hashtable on error. | |
4756 | */ | |
4757 | *_ua_chan = ua_chan; | |
4758 | } | |
b0a40d28 DG |
4759 | return ret; |
4760 | } | |
4761 | ||
5b4a0ec0 | 4762 | /* |
edb67388 | 4763 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 4764 | */ |
35a9059d | 4765 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
4766 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4767 | { | |
4768 | int ret = 0; | |
bec39940 | 4769 | struct lttng_ht_iter iter, uiter; |
18eace3b | 4770 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
4771 | struct ust_app *app; |
4772 | struct ust_app_session *ua_sess; | |
4773 | struct ust_app_channel *ua_chan; | |
4774 | struct ust_app_event *ua_event; | |
48842b30 | 4775 | |
88e3c2f5 | 4776 | assert(usess->active); |
d9bf3ca4 | 4777 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 4778 | uevent->attr.name, usess->id); |
48842b30 | 4779 | |
edb67388 DG |
4780 | /* |
4781 | * NOTE: At this point, this function is called only if the session and | |
4782 | * channel passed are already created for all apps. and enabled on the | |
4783 | * tracer also. | |
4784 | */ | |
4785 | ||
48842b30 | 4786 | rcu_read_lock(); |
421cb601 DG |
4787 | |
4788 | /* For all registered applications */ | |
852d0037 | 4789 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4790 | if (!app->compatible) { |
4791 | /* | |
4792 | * TODO: In time, we should notice the caller of this error by | |
4793 | * telling him that this is a version error. | |
4794 | */ | |
4795 | continue; | |
4796 | } | |
edb67388 | 4797 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4798 | if (!ua_sess) { |
4799 | /* The application has problem or is probably dead. */ | |
4800 | continue; | |
4801 | } | |
ba767faf | 4802 | |
d0b96690 DG |
4803 | pthread_mutex_lock(&ua_sess->lock); |
4804 | ||
b161602a MD |
4805 | if (ua_sess->deleted) { |
4806 | pthread_mutex_unlock(&ua_sess->lock); | |
4807 | continue; | |
4808 | } | |
4809 | ||
edb67388 | 4810 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4811 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4812 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
a7169585 MD |
4813 | /* |
4814 | * It is possible that the channel cannot be found is | |
4815 | * the channel/event creation occurs concurrently with | |
4816 | * an application exit. | |
4817 | */ | |
4818 | if (!ua_chan_node) { | |
4819 | pthread_mutex_unlock(&ua_sess->lock); | |
4820 | continue; | |
4821 | } | |
edb67388 DG |
4822 | |
4823 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4824 | ||
18eace3b DG |
4825 | /* Get event node */ |
4826 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
39c5a3a7 | 4827 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 4828 | if (ua_event == NULL) { |
7f79d3a1 | 4829 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 4830 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 4831 | goto next_app; |
35a9059d | 4832 | } |
35a9059d DG |
4833 | |
4834 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
4835 | if (ret < 0) { | |
d0b96690 | 4836 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 4837 | goto error; |
48842b30 | 4838 | } |
d0b96690 DG |
4839 | next_app: |
4840 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
4841 | } |
4842 | ||
7f79d3a1 | 4843 | error: |
edb67388 | 4844 | rcu_read_unlock(); |
edb67388 DG |
4845 | return ret; |
4846 | } | |
4847 | ||
4848 | /* | |
4849 | * For a specific existing UST session and UST channel, creates the event for | |
4850 | * all registered apps. | |
4851 | */ | |
35a9059d | 4852 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
4853 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4854 | { | |
4855 | int ret = 0; | |
bec39940 DG |
4856 | struct lttng_ht_iter iter, uiter; |
4857 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
4858 | struct ust_app *app; |
4859 | struct ust_app_session *ua_sess; | |
4860 | struct ust_app_channel *ua_chan; | |
4861 | ||
88e3c2f5 | 4862 | assert(usess->active); |
d9bf3ca4 | 4863 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 4864 | uevent->attr.name, usess->id); |
edb67388 | 4865 | |
edb67388 DG |
4866 | rcu_read_lock(); |
4867 | ||
4868 | /* For all registered applications */ | |
852d0037 | 4869 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4870 | if (!app->compatible) { |
4871 | /* | |
4872 | * TODO: In time, we should notice the caller of this error by | |
4873 | * telling him that this is a version error. | |
4874 | */ | |
4875 | continue; | |
4876 | } | |
edb67388 | 4877 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4878 | if (!ua_sess) { |
4879 | /* The application has problem or is probably dead. */ | |
4880 | continue; | |
4881 | } | |
48842b30 | 4882 | |
d0b96690 | 4883 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
4884 | |
4885 | if (ua_sess->deleted) { | |
4886 | pthread_mutex_unlock(&ua_sess->lock); | |
4887 | continue; | |
4888 | } | |
4889 | ||
48842b30 | 4890 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4891 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4892 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
4893 | /* If the channel is not found, there is a code flow error */ |
4894 | assert(ua_chan_node); | |
4895 | ||
48842b30 DG |
4896 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
4897 | ||
edb67388 | 4898 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 4899 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 4900 | if (ret < 0) { |
49c336c1 | 4901 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
4902 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
4903 | break; | |
4904 | } | |
4905 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 4906 | uevent->attr.name, app->pid); |
5b4a0ec0 | 4907 | continue; |
48842b30 | 4908 | } |
48842b30 | 4909 | } |
5b4a0ec0 | 4910 | |
48842b30 | 4911 | rcu_read_unlock(); |
48842b30 DG |
4912 | return ret; |
4913 | } | |
4914 | ||
5b4a0ec0 DG |
4915 | /* |
4916 | * Start tracing for a specific UST session and app. | |
fad1ed2f JR |
4917 | * |
4918 | * Called with UST app session lock held. | |
4919 | * | |
5b4a0ec0 | 4920 | */ |
b34cbebf | 4921 | static |
421cb601 | 4922 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
4923 | { |
4924 | int ret = 0; | |
48842b30 | 4925 | struct ust_app_session *ua_sess; |
48842b30 | 4926 | |
852d0037 | 4927 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 4928 | |
509cbaf8 MD |
4929 | rcu_read_lock(); |
4930 | ||
e0c7ec2b DG |
4931 | if (!app->compatible) { |
4932 | goto end; | |
4933 | } | |
4934 | ||
421cb601 DG |
4935 | ua_sess = lookup_session_by_app(usess, app); |
4936 | if (ua_sess == NULL) { | |
d42f20df DG |
4937 | /* The session is in teardown process. Ignore and continue. */ |
4938 | goto end; | |
421cb601 | 4939 | } |
48842b30 | 4940 | |
d0b96690 DG |
4941 | pthread_mutex_lock(&ua_sess->lock); |
4942 | ||
b161602a MD |
4943 | if (ua_sess->deleted) { |
4944 | pthread_mutex_unlock(&ua_sess->lock); | |
4945 | goto end; | |
4946 | } | |
4947 | ||
b0a1c741 JR |
4948 | if (ua_sess->enabled) { |
4949 | pthread_mutex_unlock(&ua_sess->lock); | |
4950 | goto end; | |
4951 | } | |
4952 | ||
aea829b3 DG |
4953 | /* Upon restart, we skip the setup, already done */ |
4954 | if (ua_sess->started) { | |
8be98f9a | 4955 | goto skip_setup; |
aea829b3 | 4956 | } |
8be98f9a | 4957 | |
840cb59c | 4958 | health_code_update(); |
86acf0da | 4959 | |
8be98f9a | 4960 | skip_setup: |
a945cdc7 | 4961 | /* This starts the UST tracing */ |
fb45065e | 4962 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4963 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
fb45065e | 4964 | pthread_mutex_unlock(&app->sock_lock); |
421cb601 | 4965 | if (ret < 0) { |
ffe60014 DG |
4966 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4967 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
4968 | app->pid, ret); | |
4969 | } else { | |
4970 | DBG("UST app start session failed. Application is dead."); | |
3757b385 DG |
4971 | /* |
4972 | * This is normal behavior, an application can die during the | |
4973 | * creation process. Don't report an error so the execution can | |
4974 | * continue normally. | |
4975 | */ | |
4976 | pthread_mutex_unlock(&ua_sess->lock); | |
4977 | goto end; | |
ffe60014 | 4978 | } |
d0b96690 | 4979 | goto error_unlock; |
421cb601 | 4980 | } |
5b4a0ec0 | 4981 | |
55c3953d DG |
4982 | /* Indicate that the session has been started once */ |
4983 | ua_sess->started = 1; | |
b0a1c741 | 4984 | ua_sess->enabled = 1; |
55c3953d | 4985 | |
d0b96690 DG |
4986 | pthread_mutex_unlock(&ua_sess->lock); |
4987 | ||
840cb59c | 4988 | health_code_update(); |
86acf0da | 4989 | |
421cb601 | 4990 | /* Quiescent wait after starting trace */ |
fb45065e | 4991 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4992 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4993 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4994 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4995 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4996 | app->pid, ret); | |
4997 | } | |
48842b30 | 4998 | |
e0c7ec2b DG |
4999 | end: |
5000 | rcu_read_unlock(); | |
840cb59c | 5001 | health_code_update(); |
421cb601 | 5002 | return 0; |
48842b30 | 5003 | |
d0b96690 DG |
5004 | error_unlock: |
5005 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 5006 | rcu_read_unlock(); |
840cb59c | 5007 | health_code_update(); |
421cb601 DG |
5008 | return -1; |
5009 | } | |
48842b30 | 5010 | |
8be98f9a MD |
5011 | /* |
5012 | * Stop tracing for a specific UST session and app. | |
5013 | */ | |
b34cbebf | 5014 | static |
8be98f9a MD |
5015 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
5016 | { | |
5017 | int ret = 0; | |
5018 | struct ust_app_session *ua_sess; | |
7972aab2 | 5019 | struct ust_registry_session *registry; |
8be98f9a | 5020 | |
852d0037 | 5021 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
5022 | |
5023 | rcu_read_lock(); | |
5024 | ||
e0c7ec2b | 5025 | if (!app->compatible) { |
d88aee68 | 5026 | goto end_no_session; |
e0c7ec2b DG |
5027 | } |
5028 | ||
8be98f9a MD |
5029 | ua_sess = lookup_session_by_app(usess, app); |
5030 | if (ua_sess == NULL) { | |
d88aee68 | 5031 | goto end_no_session; |
8be98f9a MD |
5032 | } |
5033 | ||
d88aee68 DG |
5034 | pthread_mutex_lock(&ua_sess->lock); |
5035 | ||
b161602a MD |
5036 | if (ua_sess->deleted) { |
5037 | pthread_mutex_unlock(&ua_sess->lock); | |
5038 | goto end_no_session; | |
5039 | } | |
5040 | ||
9bc07046 DG |
5041 | /* |
5042 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
5043 | * that was never started. It's possible since we can have a fail start |
5044 | * from either the application manager thread or the command thread. Simply | |
5045 | * indicate that this is a stop error. | |
9bc07046 | 5046 | */ |
f9dfc3d9 | 5047 | if (!ua_sess->started) { |
c45536e1 DG |
5048 | goto error_rcu_unlock; |
5049 | } | |
7db205b5 | 5050 | |
840cb59c | 5051 | health_code_update(); |
86acf0da | 5052 | |
9d6c7d3f | 5053 | /* This inhibits UST tracing */ |
fb45065e | 5054 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 5055 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
fb45065e | 5056 | pthread_mutex_unlock(&app->sock_lock); |
9d6c7d3f | 5057 | if (ret < 0) { |
ffe60014 DG |
5058 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
5059 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
5060 | app->pid, ret); | |
5061 | } else { | |
5062 | DBG("UST app stop session failed. Application is dead."); | |
3757b385 DG |
5063 | /* |
5064 | * This is normal behavior, an application can die during the | |
5065 | * creation process. Don't report an error so the execution can | |
5066 | * continue normally. | |
5067 | */ | |
5068 | goto end_unlock; | |
ffe60014 | 5069 | } |
9d6c7d3f DG |
5070 | goto error_rcu_unlock; |
5071 | } | |
5072 | ||
840cb59c | 5073 | health_code_update(); |
b0a1c741 | 5074 | ua_sess->enabled = 0; |
86acf0da | 5075 | |
9d6c7d3f | 5076 | /* Quiescent wait after stopping trace */ |
fb45065e | 5077 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 5078 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 5079 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
5080 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
5081 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
5082 | app->pid, ret); | |
5083 | } | |
9d6c7d3f | 5084 | |
840cb59c | 5085 | health_code_update(); |
86acf0da | 5086 | |
b34cbebf | 5087 | registry = get_session_registry(ua_sess); |
fad1ed2f JR |
5088 | |
5089 | /* The UST app session is held registry shall not be null. */ | |
b34cbebf | 5090 | assert(registry); |
1b532a60 | 5091 | |
ce34fcd0 MD |
5092 | /* Push metadata for application before freeing the application. */ |
5093 | (void) push_metadata(registry, ua_sess->consumer); | |
b34cbebf | 5094 | |
3757b385 | 5095 | end_unlock: |
b34cbebf MD |
5096 | pthread_mutex_unlock(&ua_sess->lock); |
5097 | end_no_session: | |
5098 | rcu_read_unlock(); | |
5099 | health_code_update(); | |
5100 | return 0; | |
5101 | ||
5102 | error_rcu_unlock: | |
5103 | pthread_mutex_unlock(&ua_sess->lock); | |
5104 | rcu_read_unlock(); | |
5105 | health_code_update(); | |
5106 | return -1; | |
5107 | } | |
5108 | ||
b34cbebf | 5109 | static |
c4b88406 MD |
5110 | int ust_app_flush_app_session(struct ust_app *app, |
5111 | struct ust_app_session *ua_sess) | |
b34cbebf | 5112 | { |
c4b88406 | 5113 | int ret, retval = 0; |
b34cbebf | 5114 | struct lttng_ht_iter iter; |
b34cbebf | 5115 | struct ust_app_channel *ua_chan; |
c4b88406 | 5116 | struct consumer_socket *socket; |
b34cbebf | 5117 | |
c4b88406 | 5118 | DBG("Flushing app session buffers for ust app pid %d", app->pid); |
b34cbebf MD |
5119 | |
5120 | rcu_read_lock(); | |
5121 | ||
5122 | if (!app->compatible) { | |
c4b88406 | 5123 | goto end_not_compatible; |
b34cbebf MD |
5124 | } |
5125 | ||
5126 | pthread_mutex_lock(&ua_sess->lock); | |
5127 | ||
b161602a MD |
5128 | if (ua_sess->deleted) { |
5129 | goto end_deleted; | |
5130 | } | |
5131 | ||
b34cbebf MD |
5132 | health_code_update(); |
5133 | ||
9d6c7d3f | 5134 | /* Flushing buffers */ |
c4b88406 MD |
5135 | socket = consumer_find_socket_by_bitness(app->bits_per_long, |
5136 | ua_sess->consumer); | |
ce34fcd0 MD |
5137 | |
5138 | /* Flush buffers and push metadata. */ | |
5139 | switch (ua_sess->buffer_type) { | |
5140 | case LTTNG_BUFFER_PER_PID: | |
5141 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, | |
5142 | node.node) { | |
5143 | health_code_update(); | |
ce34fcd0 MD |
5144 | ret = consumer_flush_channel(socket, ua_chan->key); |
5145 | if (ret) { | |
5146 | ERR("Error flushing consumer channel"); | |
5147 | retval = -1; | |
5148 | continue; | |
5149 | } | |
8be98f9a | 5150 | } |
ce34fcd0 MD |
5151 | break; |
5152 | case LTTNG_BUFFER_PER_UID: | |
5153 | default: | |
5154 | assert(0); | |
5155 | break; | |
8be98f9a | 5156 | } |
8be98f9a | 5157 | |
840cb59c | 5158 | health_code_update(); |
86acf0da | 5159 | |
b161602a | 5160 | end_deleted: |
d88aee68 | 5161 | pthread_mutex_unlock(&ua_sess->lock); |
ce34fcd0 | 5162 | |
c4b88406 MD |
5163 | end_not_compatible: |
5164 | rcu_read_unlock(); | |
5165 | health_code_update(); | |
5166 | return retval; | |
5167 | } | |
5168 | ||
5169 | /* | |
ce34fcd0 MD |
5170 | * Flush buffers for all applications for a specific UST session. |
5171 | * Called with UST session lock held. | |
c4b88406 MD |
5172 | */ |
5173 | static | |
ce34fcd0 | 5174 | int ust_app_flush_session(struct ltt_ust_session *usess) |
c4b88406 MD |
5175 | |
5176 | { | |
99b1411c | 5177 | int ret = 0; |
c4b88406 | 5178 | |
ce34fcd0 | 5179 | DBG("Flushing session buffers for all ust apps"); |
c4b88406 MD |
5180 | |
5181 | rcu_read_lock(); | |
5182 | ||
ce34fcd0 MD |
5183 | /* Flush buffers and push metadata. */ |
5184 | switch (usess->buffer_type) { | |
5185 | case LTTNG_BUFFER_PER_UID: | |
5186 | { | |
5187 | struct buffer_reg_uid *reg; | |
5188 | struct lttng_ht_iter iter; | |
5189 | ||
5190 | /* Flush all per UID buffers associated to that session. */ | |
5191 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
5192 | struct ust_registry_session *ust_session_reg; | |
5193 | struct buffer_reg_channel *reg_chan; | |
5194 | struct consumer_socket *socket; | |
5195 | ||
5196 | /* Get consumer socket to use to push the metadata.*/ | |
5197 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
5198 | usess->consumer); | |
5199 | if (!socket) { | |
5200 | /* Ignore request if no consumer is found for the session. */ | |
5201 | continue; | |
5202 | } | |
5203 | ||
5204 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
5205 | reg_chan, node.node) { | |
5206 | /* | |
5207 | * The following call will print error values so the return | |
5208 | * code is of little importance because whatever happens, we | |
5209 | * have to try them all. | |
5210 | */ | |
5211 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
5212 | } | |
5213 | ||
5214 | ust_session_reg = reg->registry->reg.ust; | |
5215 | /* Push metadata. */ | |
5216 | (void) push_metadata(ust_session_reg, usess->consumer); | |
5217 | } | |
ce34fcd0 MD |
5218 | break; |
5219 | } | |
5220 | case LTTNG_BUFFER_PER_PID: | |
5221 | { | |
5222 | struct ust_app_session *ua_sess; | |
5223 | struct lttng_ht_iter iter; | |
5224 | struct ust_app *app; | |
5225 | ||
5226 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5227 | ua_sess = lookup_session_by_app(usess, app); | |
5228 | if (ua_sess == NULL) { | |
5229 | continue; | |
5230 | } | |
5231 | (void) ust_app_flush_app_session(app, ua_sess); | |
5232 | } | |
5233 | break; | |
5234 | } | |
5235 | default: | |
99b1411c | 5236 | ret = -1; |
ce34fcd0 MD |
5237 | assert(0); |
5238 | break; | |
c4b88406 | 5239 | } |
c4b88406 | 5240 | |
7db205b5 | 5241 | rcu_read_unlock(); |
840cb59c | 5242 | health_code_update(); |
c4b88406 | 5243 | return ret; |
8be98f9a MD |
5244 | } |
5245 | ||
0dd01979 MD |
5246 | static |
5247 | int ust_app_clear_quiescent_app_session(struct ust_app *app, | |
5248 | struct ust_app_session *ua_sess) | |
5249 | { | |
5250 | int ret = 0; | |
5251 | struct lttng_ht_iter iter; | |
5252 | struct ust_app_channel *ua_chan; | |
5253 | struct consumer_socket *socket; | |
5254 | ||
5255 | DBG("Clearing stream quiescent state for ust app pid %d", app->pid); | |
5256 | ||
5257 | rcu_read_lock(); | |
5258 | ||
5259 | if (!app->compatible) { | |
5260 | goto end_not_compatible; | |
5261 | } | |
5262 | ||
5263 | pthread_mutex_lock(&ua_sess->lock); | |
5264 | ||
5265 | if (ua_sess->deleted) { | |
5266 | goto end_unlock; | |
5267 | } | |
5268 | ||
5269 | health_code_update(); | |
5270 | ||
5271 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
5272 | ua_sess->consumer); | |
5273 | if (!socket) { | |
5274 | ERR("Failed to find consumer (%" PRIu32 ") socket", | |
5275 | app->bits_per_long); | |
5276 | ret = -1; | |
5277 | goto end_unlock; | |
5278 | } | |
5279 | ||
5280 | /* Clear quiescent state. */ | |
5281 | switch (ua_sess->buffer_type) { | |
5282 | case LTTNG_BUFFER_PER_PID: | |
5283 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, | |
5284 | ua_chan, node.node) { | |
5285 | health_code_update(); | |
5286 | ret = consumer_clear_quiescent_channel(socket, | |
5287 | ua_chan->key); | |
5288 | if (ret) { | |
5289 | ERR("Error clearing quiescent state for consumer channel"); | |
5290 | ret = -1; | |
5291 | continue; | |
5292 | } | |
5293 | } | |
5294 | break; | |
5295 | case LTTNG_BUFFER_PER_UID: | |
5296 | default: | |
5297 | assert(0); | |
5298 | ret = -1; | |
5299 | break; | |
5300 | } | |
5301 | ||
5302 | health_code_update(); | |
5303 | ||
5304 | end_unlock: | |
5305 | pthread_mutex_unlock(&ua_sess->lock); | |
5306 | ||
5307 | end_not_compatible: | |
5308 | rcu_read_unlock(); | |
5309 | health_code_update(); | |
5310 | return ret; | |
5311 | } | |
5312 | ||
5313 | /* | |
5314 | * Clear quiescent state in each stream for all applications for a | |
5315 | * specific UST session. | |
5316 | * Called with UST session lock held. | |
5317 | */ | |
5318 | static | |
5319 | int ust_app_clear_quiescent_session(struct ltt_ust_session *usess) | |
5320 | ||
5321 | { | |
5322 | int ret = 0; | |
5323 | ||
5324 | DBG("Clearing stream quiescent state for all ust apps"); | |
5325 | ||
5326 | rcu_read_lock(); | |
5327 | ||
5328 | switch (usess->buffer_type) { | |
5329 | case LTTNG_BUFFER_PER_UID: | |
5330 | { | |
5331 | struct lttng_ht_iter iter; | |
5332 | struct buffer_reg_uid *reg; | |
5333 | ||
5334 | /* | |
5335 | * Clear quiescent for all per UID buffers associated to | |
5336 | * that session. | |
5337 | */ | |
5338 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
5339 | struct consumer_socket *socket; | |
5340 | struct buffer_reg_channel *reg_chan; | |
5341 | ||
5342 | /* Get associated consumer socket.*/ | |
5343 | socket = consumer_find_socket_by_bitness( | |
5344 | reg->bits_per_long, usess->consumer); | |
5345 | if (!socket) { | |
5346 | /* | |
5347 | * Ignore request if no consumer is found for | |
5348 | * the session. | |
5349 | */ | |
5350 | continue; | |
5351 | } | |
5352 | ||
5353 | cds_lfht_for_each_entry(reg->registry->channels->ht, | |
5354 | &iter.iter, reg_chan, node.node) { | |
5355 | /* | |
5356 | * The following call will print error values so | |
5357 | * the return code is of little importance | |
5358 | * because whatever happens, we have to try them | |
5359 | * all. | |
5360 | */ | |
5361 | (void) consumer_clear_quiescent_channel(socket, | |
5362 | reg_chan->consumer_key); | |
5363 | } | |
5364 | } | |
5365 | break; | |
5366 | } | |
5367 | case LTTNG_BUFFER_PER_PID: | |
5368 | { | |
5369 | struct ust_app_session *ua_sess; | |
5370 | struct lttng_ht_iter iter; | |
5371 | struct ust_app *app; | |
5372 | ||
5373 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, | |
5374 | pid_n.node) { | |
5375 | ua_sess = lookup_session_by_app(usess, app); | |
5376 | if (ua_sess == NULL) { | |
5377 | continue; | |
5378 | } | |
5379 | (void) ust_app_clear_quiescent_app_session(app, | |
5380 | ua_sess); | |
5381 | } | |
5382 | break; | |
5383 | } | |
5384 | default: | |
5385 | ret = -1; | |
5386 | assert(0); | |
5387 | break; | |
5388 | } | |
5389 | ||
5390 | rcu_read_unlock(); | |
5391 | health_code_update(); | |
5392 | return ret; | |
5393 | } | |
5394 | ||
84cd17c6 MD |
5395 | /* |
5396 | * Destroy a specific UST session in apps. | |
5397 | */ | |
3353de95 | 5398 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 5399 | { |
ffe60014 | 5400 | int ret; |
84cd17c6 | 5401 | struct ust_app_session *ua_sess; |
bec39940 | 5402 | struct lttng_ht_iter iter; |
d9bf3ca4 | 5403 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 5404 | |
852d0037 | 5405 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
5406 | |
5407 | rcu_read_lock(); | |
5408 | ||
e0c7ec2b DG |
5409 | if (!app->compatible) { |
5410 | goto end; | |
5411 | } | |
5412 | ||
84cd17c6 | 5413 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 5414 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 5415 | if (node == NULL) { |
d42f20df DG |
5416 | /* Session is being or is deleted. */ |
5417 | goto end; | |
84cd17c6 MD |
5418 | } |
5419 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 5420 | |
840cb59c | 5421 | health_code_update(); |
d0b96690 | 5422 | destroy_app_session(app, ua_sess); |
84cd17c6 | 5423 | |
840cb59c | 5424 | health_code_update(); |
7db205b5 | 5425 | |
84cd17c6 | 5426 | /* Quiescent wait after stopping trace */ |
fb45065e | 5427 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 5428 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 5429 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
5430 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
5431 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
5432 | app->pid, ret); | |
5433 | } | |
e0c7ec2b DG |
5434 | end: |
5435 | rcu_read_unlock(); | |
840cb59c | 5436 | health_code_update(); |
84cd17c6 | 5437 | return 0; |
84cd17c6 MD |
5438 | } |
5439 | ||
5b4a0ec0 DG |
5440 | /* |
5441 | * Start tracing for the UST session. | |
5442 | */ | |
421cb601 DG |
5443 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
5444 | { | |
bec39940 | 5445 | struct lttng_ht_iter iter; |
421cb601 | 5446 | struct ust_app *app; |
48842b30 | 5447 | |
421cb601 DG |
5448 | DBG("Starting all UST traces"); |
5449 | ||
bb2452c8 MD |
5450 | /* |
5451 | * Even though the start trace might fail, flag this session active so | |
5452 | * other application coming in are started by default. | |
5453 | */ | |
5454 | usess->active = 1; | |
5455 | ||
421cb601 | 5456 | rcu_read_lock(); |
421cb601 | 5457 | |
0dd01979 MD |
5458 | /* |
5459 | * In a start-stop-start use-case, we need to clear the quiescent state | |
5460 | * of each channel set by the prior stop command, thus ensuring that a | |
5461 | * following stop or destroy is sure to grab a timestamp_end near those | |
5462 | * operations, even if the packet is empty. | |
5463 | */ | |
5464 | (void) ust_app_clear_quiescent_session(usess); | |
5465 | ||
0498a00c MD |
5466 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
5467 | ust_app_global_update(usess, app); | |
5468 | } | |
5469 | ||
48842b30 DG |
5470 | rcu_read_unlock(); |
5471 | ||
5472 | return 0; | |
5473 | } | |
487cf67c | 5474 | |
8be98f9a MD |
5475 | /* |
5476 | * Start tracing for the UST session. | |
ce34fcd0 | 5477 | * Called with UST session lock held. |
8be98f9a MD |
5478 | */ |
5479 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
5480 | { | |
5481 | int ret = 0; | |
bec39940 | 5482 | struct lttng_ht_iter iter; |
8be98f9a MD |
5483 | struct ust_app *app; |
5484 | ||
5485 | DBG("Stopping all UST traces"); | |
5486 | ||
bb2452c8 MD |
5487 | /* |
5488 | * Even though the stop trace might fail, flag this session inactive so | |
5489 | * other application coming in are not started by default. | |
5490 | */ | |
5491 | usess->active = 0; | |
5492 | ||
8be98f9a MD |
5493 | rcu_read_lock(); |
5494 | ||
b34cbebf MD |
5495 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
5496 | ret = ust_app_stop_trace(usess, app); | |
5497 | if (ret < 0) { | |
5498 | /* Continue to next apps even on error */ | |
5499 | continue; | |
5500 | } | |
5501 | } | |
5502 | ||
ce34fcd0 | 5503 | (void) ust_app_flush_session(usess); |
8be98f9a MD |
5504 | |
5505 | rcu_read_unlock(); | |
5506 | ||
5507 | return 0; | |
5508 | } | |
5509 | ||
84cd17c6 MD |
5510 | /* |
5511 | * Destroy app UST session. | |
5512 | */ | |
5513 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
5514 | { | |
5515 | int ret = 0; | |
bec39940 | 5516 | struct lttng_ht_iter iter; |
84cd17c6 MD |
5517 | struct ust_app *app; |
5518 | ||
5519 | DBG("Destroy all UST traces"); | |
5520 | ||
5521 | rcu_read_lock(); | |
5522 | ||
852d0037 | 5523 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 5524 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
5525 | if (ret < 0) { |
5526 | /* Continue to next apps even on error */ | |
5527 | continue; | |
5528 | } | |
5529 | } | |
5530 | ||
5531 | rcu_read_unlock(); | |
5532 | ||
5533 | return 0; | |
5534 | } | |
5535 | ||
88e3c2f5 | 5536 | /* The ua_sess lock must be held by the caller. */ |
a9ad0c8f | 5537 | static |
88e3c2f5 JG |
5538 | int find_or_create_ust_app_channel( |
5539 | struct ltt_ust_session *usess, | |
5540 | struct ust_app_session *ua_sess, | |
5541 | struct ust_app *app, | |
5542 | struct ltt_ust_channel *uchan, | |
5543 | struct ust_app_channel **ua_chan) | |
487cf67c | 5544 | { |
55c54cce | 5545 | int ret = 0; |
88e3c2f5 JG |
5546 | struct lttng_ht_iter iter; |
5547 | struct lttng_ht_node_str *ua_chan_node; | |
5548 | ||
5549 | lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &iter); | |
5550 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
5551 | if (ua_chan_node) { | |
5552 | *ua_chan = caa_container_of(ua_chan_node, | |
5553 | struct ust_app_channel, node); | |
5554 | goto end; | |
5555 | } | |
5556 | ||
5557 | ret = ust_app_channel_create(usess, ua_sess, uchan, app, ua_chan); | |
5558 | if (ret) { | |
5559 | goto end; | |
5560 | } | |
5561 | end: | |
5562 | return ret; | |
5563 | } | |
5564 | ||
5565 | static | |
5566 | int ust_app_channel_synchronize_event(struct ust_app_channel *ua_chan, | |
5567 | struct ltt_ust_event *uevent, struct ust_app_session *ua_sess, | |
5568 | struct ust_app *app) | |
5569 | { | |
5570 | int ret = 0; | |
5571 | struct ust_app_event *ua_event = NULL; | |
5572 | ||
5573 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
5574 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); | |
5575 | if (!ua_event) { | |
5576 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); | |
5577 | if (ret < 0) { | |
5578 | goto end; | |
5579 | } | |
5580 | } else { | |
5581 | if (ua_event->enabled != uevent->enabled) { | |
5582 | ret = uevent->enabled ? | |
5583 | enable_ust_app_event(ua_sess, ua_event, app) : | |
5584 | disable_ust_app_event(ua_sess, ua_event, app); | |
5585 | } | |
5586 | } | |
5587 | ||
5588 | end: | |
5589 | return ret; | |
5590 | } | |
5591 | ||
993578ff JR |
5592 | /* Called with RCU read-side lock held. */ |
5593 | static | |
5594 | void ust_app_synchronize_event_notifier_rules(struct ust_app *app) | |
5595 | { | |
5596 | int ret = 0; | |
5597 | enum lttng_error_code ret_code; | |
5598 | enum lttng_trigger_status t_status; | |
5599 | struct lttng_ht_iter app_trigger_iter; | |
5600 | struct lttng_triggers *triggers = NULL; | |
5601 | struct ust_app_event_notifier_rule *event_notifier_rule; | |
5602 | unsigned int count, i; | |
5603 | ||
5604 | /* | |
5605 | * Currrently, registering or unregistering a trigger with an | |
5606 | * event rule condition causes a full synchronization of the event | |
5607 | * notifiers. | |
5608 | * | |
5609 | * The first step attempts to add an event notifier for all registered | |
5610 | * triggers that apply to the user space tracers. Then, the | |
5611 | * application's event notifiers rules are all checked against the list | |
5612 | * of registered triggers. Any event notifier that doesn't have a | |
5613 | * matching trigger can be assumed to have been disabled. | |
5614 | * | |
5615 | * All of this is inefficient, but is put in place to get the feature | |
5616 | * rolling as it is simpler at this moment. It will be optimized Soon™ | |
5617 | * to allow the state of enabled | |
5618 | * event notifiers to be synchronized in a piece-wise way. | |
5619 | */ | |
5620 | ||
5621 | /* Get all triggers using uid 0 (root) */ | |
5622 | ret_code = notification_thread_command_list_triggers( | |
5623 | notification_thread_handle, 0, &triggers); | |
5624 | if (ret_code != LTTNG_OK) { | |
5625 | ret = -1; | |
5626 | goto end; | |
5627 | } | |
5628 | ||
5629 | assert(triggers); | |
5630 | ||
5631 | t_status = lttng_triggers_get_count(triggers, &count); | |
5632 | if (t_status != LTTNG_TRIGGER_STATUS_OK) { | |
5633 | ret = -1; | |
5634 | goto end; | |
5635 | } | |
5636 | ||
5637 | for (i = 0; i < count; i++) { | |
5638 | struct lttng_condition *condition; | |
5639 | struct lttng_event_rule *event_rule; | |
5640 | struct lttng_trigger *trigger; | |
5641 | const struct ust_app_event_notifier_rule *looked_up_event_notifier_rule; | |
5642 | enum lttng_condition_status condition_status; | |
5643 | uint64_t token; | |
5644 | ||
5645 | trigger = lttng_triggers_borrow_mutable_at_index(triggers, i); | |
5646 | assert(trigger); | |
5647 | ||
5648 | token = lttng_trigger_get_tracer_token(trigger); | |
5649 | condition = lttng_trigger_get_condition(trigger); | |
5650 | ||
5651 | if (lttng_condition_get_type(condition) != LTTNG_CONDITION_TYPE_EVENT_RULE_HIT) { | |
5652 | /* Does not apply */ | |
5653 | continue; | |
5654 | } | |
5655 | ||
5656 | condition_status = lttng_condition_event_rule_borrow_rule_mutable(condition, &event_rule); | |
5657 | assert(condition_status == LTTNG_CONDITION_STATUS_OK); | |
5658 | ||
5659 | if (lttng_event_rule_get_domain_type(event_rule) == LTTNG_DOMAIN_KERNEL) { | |
5660 | /* Skip kernel related triggers. */ | |
5661 | continue; | |
5662 | } | |
5663 | ||
5664 | /* | |
5665 | * Find or create the associated token event rule. The caller | |
5666 | * holds the RCU read lock, so this is safe to call without | |
5667 | * explicitly acquiring it here. | |
5668 | */ | |
5669 | looked_up_event_notifier_rule = find_ust_app_event_notifier_rule( | |
5670 | app->token_to_event_notifier_rule_ht, token); | |
5671 | if (!looked_up_event_notifier_rule) { | |
267d66aa | 5672 | ret = create_ust_app_event_notifier_rule(trigger, app); |
993578ff JR |
5673 | if (ret < 0) { |
5674 | goto end; | |
5675 | } | |
5676 | } | |
5677 | } | |
5678 | ||
5679 | rcu_read_lock(); | |
5680 | /* Remove all unknown event sources from the app. */ | |
5681 | cds_lfht_for_each_entry (app->token_to_event_notifier_rule_ht->ht, | |
5682 | &app_trigger_iter.iter, event_notifier_rule, | |
5683 | node.node) { | |
5684 | const uint64_t app_token = event_notifier_rule->token; | |
5685 | bool found = false; | |
5686 | ||
5687 | /* | |
5688 | * Check if the app event trigger still exists on the | |
5689 | * notification side. | |
5690 | */ | |
5691 | for (i = 0; i < count; i++) { | |
5692 | uint64_t notification_thread_token; | |
5693 | const struct lttng_trigger *trigger = | |
5694 | lttng_triggers_get_at_index( | |
5695 | triggers, i); | |
5696 | ||
5697 | assert(trigger); | |
5698 | ||
5699 | notification_thread_token = | |
5700 | lttng_trigger_get_tracer_token(trigger); | |
5701 | ||
5702 | if (notification_thread_token == app_token) { | |
5703 | found = true; | |
5704 | break; | |
5705 | } | |
5706 | } | |
5707 | ||
5708 | if (found) { | |
5709 | /* Still valid. */ | |
5710 | continue; | |
5711 | } | |
5712 | ||
5713 | /* | |
5714 | * This trigger was unregistered, disable it on the tracer's | |
5715 | * side. | |
5716 | */ | |
5717 | ret = lttng_ht_del(app->token_to_event_notifier_rule_ht, | |
5718 | &app_trigger_iter); | |
5719 | assert(ret == 0); | |
5720 | ||
5721 | /* Callee logs errors. */ | |
5722 | (void) disable_ust_object(app, event_notifier_rule->obj); | |
5723 | ||
5724 | delete_ust_app_event_notifier_rule( | |
5725 | app->sock, event_notifier_rule, app); | |
5726 | } | |
5727 | ||
5728 | rcu_read_unlock(); | |
5729 | ||
5730 | end: | |
5731 | lttng_triggers_destroy(triggers); | |
5732 | return; | |
5733 | } | |
5734 | ||
88e3c2f5 JG |
5735 | /* |
5736 | * The caller must ensure that the application is compatible and is tracked | |
2a3a1a2b | 5737 | * by the process attribute trackers. |
88e3c2f5 JG |
5738 | */ |
5739 | static | |
5740 | void ust_app_synchronize(struct ltt_ust_session *usess, | |
5741 | struct ust_app *app) | |
5742 | { | |
5743 | int ret = 0; | |
5744 | struct cds_lfht_iter uchan_iter; | |
5745 | struct ltt_ust_channel *uchan; | |
3d8ca23b | 5746 | struct ust_app_session *ua_sess = NULL; |
1f3580c7 | 5747 | |
88e3c2f5 JG |
5748 | /* |
5749 | * The application's configuration should only be synchronized for | |
5750 | * active sessions. | |
5751 | */ | |
5752 | assert(usess->active); | |
5753 | ||
5754 | ret = find_or_create_ust_app_session(usess, app, &ua_sess, NULL); | |
3d8ca23b DG |
5755 | if (ret < 0) { |
5756 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
5757 | goto error; |
5758 | } | |
3d8ca23b | 5759 | assert(ua_sess); |
487cf67c | 5760 | |
d0b96690 | 5761 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
5762 | if (ua_sess->deleted) { |
5763 | pthread_mutex_unlock(&ua_sess->lock); | |
5764 | goto end; | |
5765 | } | |
5766 | ||
88e3c2f5 | 5767 | rcu_read_lock(); |
ef67c072 | 5768 | |
88e3c2f5 JG |
5769 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &uchan_iter, |
5770 | uchan, node.node) { | |
5771 | struct ust_app_channel *ua_chan; | |
5772 | struct cds_lfht_iter uevent_iter; | |
5773 | struct ltt_ust_event *uevent; | |
487cf67c | 5774 | |
31746f93 | 5775 | /* |
88e3c2f5 JG |
5776 | * Search for a matching ust_app_channel. If none is found, |
5777 | * create it. Creating the channel will cause the ua_chan | |
5778 | * structure to be allocated, the channel buffers to be | |
5779 | * allocated (if necessary) and sent to the application, and | |
5780 | * all enabled contexts will be added to the channel. | |
31746f93 | 5781 | */ |
f3db82be | 5782 | ret = find_or_create_ust_app_channel(usess, ua_sess, |
88e3c2f5 JG |
5783 | app, uchan, &ua_chan); |
5784 | if (ret) { | |
5785 | /* Tracer is probably gone or ENOMEM. */ | |
5786 | goto error_unlock; | |
727d5404 DG |
5787 | } |
5788 | ||
88e3c2f5 JG |
5789 | if (!ua_chan) { |
5790 | /* ua_chan will be NULL for the metadata channel */ | |
5791 | continue; | |
5792 | } | |
727d5404 | 5793 | |
88e3c2f5 | 5794 | cds_lfht_for_each_entry(uchan->events->ht, &uevent_iter, uevent, |
bec39940 | 5795 | node.node) { |
88e3c2f5 JG |
5796 | ret = ust_app_channel_synchronize_event(ua_chan, |
5797 | uevent, ua_sess, app); | |
5798 | if (ret) { | |
d0b96690 | 5799 | goto error_unlock; |
487cf67c | 5800 | } |
36dc12cc | 5801 | } |
d0b96690 | 5802 | |
88e3c2f5 JG |
5803 | if (ua_chan->enabled != uchan->enabled) { |
5804 | ret = uchan->enabled ? | |
5805 | enable_ust_app_channel(ua_sess, uchan, app) : | |
5806 | disable_ust_app_channel(ua_sess, ua_chan, app); | |
5807 | if (ret) { | |
5808 | goto error_unlock; | |
5809 | } | |
5810 | } | |
36dc12cc | 5811 | } |
ef67c072 JG |
5812 | |
5813 | /* | |
5814 | * Create the metadata for the application. This returns gracefully if a | |
5815 | * metadata was already set for the session. | |
5816 | * | |
5817 | * The metadata channel must be created after the data channels as the | |
5818 | * consumer daemon assumes this ordering. When interacting with a relay | |
5819 | * daemon, the consumer will use this assumption to send the | |
5820 | * "STREAMS_SENT" message to the relay daemon. | |
5821 | */ | |
5822 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer); | |
5823 | if (ret < 0) { | |
5824 | goto error_unlock; | |
5825 | } | |
5826 | ||
88e3c2f5 | 5827 | rcu_read_unlock(); |
0498a00c | 5828 | |
a9ad0c8f | 5829 | end: |
88e3c2f5 | 5830 | pthread_mutex_unlock(&ua_sess->lock); |
ffe60014 | 5831 | /* Everything went well at this point. */ |
ffe60014 DG |
5832 | return; |
5833 | ||
d0b96690 | 5834 | error_unlock: |
88e3c2f5 | 5835 | rcu_read_unlock(); |
d0b96690 | 5836 | pthread_mutex_unlock(&ua_sess->lock); |
487cf67c | 5837 | error: |
ffe60014 | 5838 | if (ua_sess) { |
d0b96690 | 5839 | destroy_app_session(app, ua_sess); |
ffe60014 | 5840 | } |
487cf67c DG |
5841 | return; |
5842 | } | |
55cc08a6 | 5843 | |
a9ad0c8f MD |
5844 | static |
5845 | void ust_app_global_destroy(struct ltt_ust_session *usess, struct ust_app *app) | |
5846 | { | |
5847 | struct ust_app_session *ua_sess; | |
5848 | ||
5849 | ua_sess = lookup_session_by_app(usess, app); | |
5850 | if (ua_sess == NULL) { | |
5851 | return; | |
5852 | } | |
5853 | destroy_app_session(app, ua_sess); | |
5854 | } | |
5855 | ||
5856 | /* | |
5857 | * Add channels/events from UST global domain to registered apps at sock. | |
5858 | * | |
5859 | * Called with session lock held. | |
5860 | * Called with RCU read-side lock held. | |
5861 | */ | |
5862 | void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app) | |
5863 | { | |
5864 | assert(usess); | |
88e3c2f5 | 5865 | assert(usess->active); |
a9ad0c8f MD |
5866 | |
5867 | DBG2("UST app global update for app sock %d for session id %" PRIu64, | |
5868 | app->sock, usess->id); | |
5869 | ||
5870 | if (!app->compatible) { | |
5871 | return; | |
5872 | } | |
159b042f JG |
5873 | if (trace_ust_id_tracker_lookup(LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID, |
5874 | usess, app->pid) && | |
55c9e7ca | 5875 | trace_ust_id_tracker_lookup( |
159b042f JG |
5876 | LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID, |
5877 | usess, app->uid) && | |
55c9e7ca | 5878 | trace_ust_id_tracker_lookup( |
159b042f JG |
5879 | LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID, |
5880 | usess, app->gid)) { | |
88e3c2f5 JG |
5881 | /* |
5882 | * Synchronize the application's internal tracing configuration | |
5883 | * and start tracing. | |
5884 | */ | |
5885 | ust_app_synchronize(usess, app); | |
5886 | ust_app_start_trace(usess, app); | |
a9ad0c8f MD |
5887 | } else { |
5888 | ust_app_global_destroy(usess, app); | |
5889 | } | |
5890 | } | |
5891 | ||
993578ff JR |
5892 | /* |
5893 | * Add all event notifiers to an application. | |
5894 | * | |
5895 | * Called with session lock held. | |
5896 | * Called with RCU read-side lock held. | |
5897 | */ | |
5898 | void ust_app_global_update_event_notifier_rules(struct ust_app *app) | |
5899 | { | |
5900 | DBG2("UST application global event notifier rules update: app = '%s' (ppid: %d)", | |
5901 | app->name, app->ppid); | |
5902 | ||
5903 | if (!app->compatible) { | |
5904 | return; | |
5905 | } | |
5906 | ||
5907 | if (app->event_notifier_group.object == NULL) { | |
5908 | WARN("UST app global update of event notifiers for app skipped since communication handle is null: app = '%s' (ppid: %d)", | |
5909 | app->name, app->ppid); | |
5910 | return; | |
5911 | } | |
5912 | ||
5913 | ust_app_synchronize_event_notifier_rules(app); | |
5914 | } | |
5915 | ||
a9ad0c8f MD |
5916 | /* |
5917 | * Called with session lock held. | |
5918 | */ | |
5919 | void ust_app_global_update_all(struct ltt_ust_session *usess) | |
5920 | { | |
5921 | struct lttng_ht_iter iter; | |
5922 | struct ust_app *app; | |
5923 | ||
5924 | rcu_read_lock(); | |
5925 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5926 | ust_app_global_update(usess, app); | |
5927 | } | |
5928 | rcu_read_unlock(); | |
5929 | } | |
5930 | ||
993578ff JR |
5931 | void ust_app_global_update_all_event_notifier_rules(void) |
5932 | { | |
5933 | struct lttng_ht_iter iter; | |
5934 | struct ust_app *app; | |
5935 | ||
5936 | rcu_read_lock(); | |
5937 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5938 | ust_app_global_update_event_notifier_rules(app); | |
5939 | } | |
5940 | ||
5941 | rcu_read_unlock(); | |
5942 | } | |
5943 | ||
55cc08a6 DG |
5944 | /* |
5945 | * Add context to a specific channel for global UST domain. | |
5946 | */ | |
5947 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
5948 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
5949 | { | |
5950 | int ret = 0; | |
bec39940 DG |
5951 | struct lttng_ht_node_str *ua_chan_node; |
5952 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
5953 | struct ust_app_channel *ua_chan = NULL; |
5954 | struct ust_app_session *ua_sess; | |
5955 | struct ust_app *app; | |
5956 | ||
88e3c2f5 | 5957 | assert(usess->active); |
0498a00c | 5958 | |
55cc08a6 | 5959 | rcu_read_lock(); |
852d0037 | 5960 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
5961 | if (!app->compatible) { |
5962 | /* | |
5963 | * TODO: In time, we should notice the caller of this error by | |
5964 | * telling him that this is a version error. | |
5965 | */ | |
5966 | continue; | |
5967 | } | |
55cc08a6 DG |
5968 | ua_sess = lookup_session_by_app(usess, app); |
5969 | if (ua_sess == NULL) { | |
5970 | continue; | |
5971 | } | |
5972 | ||
d0b96690 | 5973 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
5974 | |
5975 | if (ua_sess->deleted) { | |
5976 | pthread_mutex_unlock(&ua_sess->lock); | |
5977 | continue; | |
5978 | } | |
5979 | ||
55cc08a6 | 5980 | /* Lookup channel in the ust app session */ |
bec39940 DG |
5981 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
5982 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 5983 | if (ua_chan_node == NULL) { |
d0b96690 | 5984 | goto next_app; |
55cc08a6 DG |
5985 | } |
5986 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
5987 | node); | |
c9edf082 | 5988 | ret = create_ust_app_channel_context(ua_chan, &uctx->ctx, app); |
55cc08a6 | 5989 | if (ret < 0) { |
d0b96690 | 5990 | goto next_app; |
55cc08a6 | 5991 | } |
d0b96690 DG |
5992 | next_app: |
5993 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
5994 | } |
5995 | ||
55cc08a6 | 5996 | rcu_read_unlock(); |
76d45b40 DG |
5997 | return ret; |
5998 | } | |
7f79d3a1 | 5999 | |
d0b96690 DG |
6000 | /* |
6001 | * Receive registration and populate the given msg structure. | |
6002 | * | |
6003 | * On success return 0 else a negative value returned by the ustctl call. | |
6004 | */ | |
6005 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
6006 | { | |
6007 | int ret; | |
6008 | uint32_t pid, ppid, uid, gid; | |
6009 | ||
6010 | assert(msg); | |
6011 | ||
6012 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
6013 | &pid, &ppid, &uid, &gid, | |
6014 | &msg->bits_per_long, | |
6015 | &msg->uint8_t_alignment, | |
6016 | &msg->uint16_t_alignment, | |
6017 | &msg->uint32_t_alignment, | |
6018 | &msg->uint64_t_alignment, | |
6019 | &msg->long_alignment, | |
6020 | &msg->byte_order, | |
6021 | msg->name); | |
6022 | if (ret < 0) { | |
6023 | switch (-ret) { | |
6024 | case EPIPE: | |
6025 | case ECONNRESET: | |
6026 | case LTTNG_UST_ERR_EXITING: | |
6027 | DBG3("UST app recv reg message failed. Application died"); | |
6028 | break; | |
6029 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
6030 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
6031 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
6032 | LTTNG_UST_ABI_MINOR_VERSION); | |
6033 | break; | |
6034 | default: | |
6035 | ERR("UST app recv reg message failed with ret %d", ret); | |
6036 | break; | |
6037 | } | |
6038 | goto error; | |
6039 | } | |
6040 | msg->pid = (pid_t) pid; | |
6041 | msg->ppid = (pid_t) ppid; | |
6042 | msg->uid = (uid_t) uid; | |
6043 | msg->gid = (gid_t) gid; | |
6044 | ||
6045 | error: | |
6046 | return ret; | |
6047 | } | |
6048 | ||
10b56aef MD |
6049 | /* |
6050 | * Return a ust app session object using the application object and the | |
6051 | * session object descriptor has a key. If not found, NULL is returned. | |
6052 | * A RCU read side lock MUST be acquired when calling this function. | |
6053 | */ | |
6054 | static struct ust_app_session *find_session_by_objd(struct ust_app *app, | |
6055 | int objd) | |
6056 | { | |
6057 | struct lttng_ht_node_ulong *node; | |
6058 | struct lttng_ht_iter iter; | |
6059 | struct ust_app_session *ua_sess = NULL; | |
6060 | ||
6061 | assert(app); | |
6062 | ||
6063 | lttng_ht_lookup(app->ust_sessions_objd, (void *)((unsigned long) objd), &iter); | |
6064 | node = lttng_ht_iter_get_node_ulong(&iter); | |
6065 | if (node == NULL) { | |
6066 | DBG2("UST app session find by objd %d not found", objd); | |
6067 | goto error; | |
6068 | } | |
6069 | ||
6070 | ua_sess = caa_container_of(node, struct ust_app_session, ust_objd_node); | |
6071 | ||
6072 | error: | |
6073 | return ua_sess; | |
6074 | } | |
6075 | ||
d88aee68 DG |
6076 | /* |
6077 | * Return a ust app channel object using the application object and the channel | |
6078 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
6079 | * lock MUST be acquired before calling this function. | |
6080 | */ | |
d0b96690 DG |
6081 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
6082 | int objd) | |
6083 | { | |
6084 | struct lttng_ht_node_ulong *node; | |
6085 | struct lttng_ht_iter iter; | |
6086 | struct ust_app_channel *ua_chan = NULL; | |
6087 | ||
6088 | assert(app); | |
6089 | ||
6090 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
6091 | node = lttng_ht_iter_get_node_ulong(&iter); | |
6092 | if (node == NULL) { | |
6093 | DBG2("UST app channel find by objd %d not found", objd); | |
6094 | goto error; | |
6095 | } | |
6096 | ||
6097 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
6098 | ||
6099 | error: | |
6100 | return ua_chan; | |
6101 | } | |
6102 | ||
d88aee68 DG |
6103 | /* |
6104 | * Reply to a register channel notification from an application on the notify | |
6105 | * socket. The channel metadata is also created. | |
6106 | * | |
6107 | * The session UST registry lock is acquired in this function. | |
6108 | * | |
6109 | * On success 0 is returned else a negative value. | |
6110 | */ | |
8eede835 | 6111 | static int reply_ust_register_channel(int sock, int cobjd, |
d0b96690 DG |
6112 | size_t nr_fields, struct ustctl_field *fields) |
6113 | { | |
6114 | int ret, ret_code = 0; | |
294e218e | 6115 | uint32_t chan_id; |
7972aab2 | 6116 | uint64_t chan_reg_key; |
d0b96690 DG |
6117 | enum ustctl_channel_header type; |
6118 | struct ust_app *app; | |
6119 | struct ust_app_channel *ua_chan; | |
6120 | struct ust_app_session *ua_sess; | |
7972aab2 | 6121 | struct ust_registry_session *registry; |
45893984 | 6122 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
6123 | |
6124 | rcu_read_lock(); | |
6125 | ||
6126 | /* Lookup application. If not found, there is a code flow error. */ | |
6127 | app = find_app_by_notify_sock(sock); | |
d88aee68 | 6128 | if (!app) { |
fad1ed2f | 6129 | DBG("Application socket %d is being torn down. Abort event notify", |
d88aee68 DG |
6130 | sock); |
6131 | ret = 0; | |
6132 | goto error_rcu_unlock; | |
6133 | } | |
d0b96690 | 6134 | |
4950b860 | 6135 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 6136 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 | 6137 | if (!ua_chan) { |
fad1ed2f | 6138 | DBG("Application channel is being torn down. Abort event notify"); |
4950b860 MD |
6139 | ret = 0; |
6140 | goto error_rcu_unlock; | |
6141 | } | |
6142 | ||
d0b96690 DG |
6143 | assert(ua_chan->session); |
6144 | ua_sess = ua_chan->session; | |
d0b96690 | 6145 | |
7972aab2 DG |
6146 | /* Get right session registry depending on the session buffer type. */ |
6147 | registry = get_session_registry(ua_sess); | |
fad1ed2f JR |
6148 | if (!registry) { |
6149 | DBG("Application session is being torn down. Abort event notify"); | |
6150 | ret = 0; | |
6151 | goto error_rcu_unlock; | |
6152 | }; | |
45893984 | 6153 | |
7972aab2 DG |
6154 | /* Depending on the buffer type, a different channel key is used. */ |
6155 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
6156 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 6157 | } else { |
7972aab2 | 6158 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
6159 | } |
6160 | ||
7972aab2 DG |
6161 | pthread_mutex_lock(®istry->lock); |
6162 | ||
6163 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
6164 | assert(chan_reg); | |
6165 | ||
6166 | if (!chan_reg->register_done) { | |
294e218e MD |
6167 | /* |
6168 | * TODO: eventually use the registry event count for | |
6169 | * this channel to better guess header type for per-pid | |
6170 | * buffers. | |
6171 | */ | |
6172 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
7972aab2 DG |
6173 | chan_reg->nr_ctx_fields = nr_fields; |
6174 | chan_reg->ctx_fields = fields; | |
fad1ed2f | 6175 | fields = NULL; |
7972aab2 | 6176 | chan_reg->header_type = type; |
d0b96690 | 6177 | } else { |
7972aab2 DG |
6178 | /* Get current already assigned values. */ |
6179 | type = chan_reg->header_type; | |
d0b96690 | 6180 | } |
7972aab2 DG |
6181 | /* Channel id is set during the object creation. */ |
6182 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
6183 | |
6184 | /* Append to metadata */ | |
7972aab2 DG |
6185 | if (!chan_reg->metadata_dumped) { |
6186 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
6187 | if (ret_code) { |
6188 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
6189 | goto reply; | |
6190 | } | |
6191 | } | |
6192 | ||
6193 | reply: | |
7972aab2 DG |
6194 | DBG3("UST app replying to register channel key %" PRIu64 |
6195 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
6196 | ret_code); | |
d0b96690 DG |
6197 | |
6198 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
6199 | if (ret < 0) { | |
6200 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6201 | ERR("UST app reply channel failed with ret %d", ret); | |
6202 | } else { | |
6203 | DBG3("UST app reply channel failed. Application died"); | |
6204 | } | |
6205 | goto error; | |
6206 | } | |
6207 | ||
7972aab2 DG |
6208 | /* This channel registry registration is completed. */ |
6209 | chan_reg->register_done = 1; | |
6210 | ||
d0b96690 | 6211 | error: |
7972aab2 | 6212 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 6213 | error_rcu_unlock: |
d0b96690 | 6214 | rcu_read_unlock(); |
fad1ed2f | 6215 | free(fields); |
d0b96690 DG |
6216 | return ret; |
6217 | } | |
6218 | ||
d88aee68 DG |
6219 | /* |
6220 | * Add event to the UST channel registry. When the event is added to the | |
6221 | * registry, the metadata is also created. Once done, this replies to the | |
6222 | * application with the appropriate error code. | |
6223 | * | |
6224 | * The session UST registry lock is acquired in the function. | |
6225 | * | |
6226 | * On success 0 is returned else a negative value. | |
6227 | */ | |
d0b96690 | 6228 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
2106efa0 PP |
6229 | char *sig, size_t nr_fields, struct ustctl_field *fields, |
6230 | int loglevel_value, char *model_emf_uri) | |
d0b96690 DG |
6231 | { |
6232 | int ret, ret_code; | |
6233 | uint32_t event_id = 0; | |
7972aab2 | 6234 | uint64_t chan_reg_key; |
d0b96690 DG |
6235 | struct ust_app *app; |
6236 | struct ust_app_channel *ua_chan; | |
6237 | struct ust_app_session *ua_sess; | |
7972aab2 | 6238 | struct ust_registry_session *registry; |
d0b96690 DG |
6239 | |
6240 | rcu_read_lock(); | |
6241 | ||
6242 | /* Lookup application. If not found, there is a code flow error. */ | |
6243 | app = find_app_by_notify_sock(sock); | |
d88aee68 | 6244 | if (!app) { |
fad1ed2f | 6245 | DBG("Application socket %d is being torn down. Abort event notify", |
d88aee68 DG |
6246 | sock); |
6247 | ret = 0; | |
6248 | goto error_rcu_unlock; | |
6249 | } | |
d0b96690 | 6250 | |
4950b860 | 6251 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 6252 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 | 6253 | if (!ua_chan) { |
fad1ed2f | 6254 | DBG("Application channel is being torn down. Abort event notify"); |
4950b860 MD |
6255 | ret = 0; |
6256 | goto error_rcu_unlock; | |
6257 | } | |
6258 | ||
d0b96690 DG |
6259 | assert(ua_chan->session); |
6260 | ua_sess = ua_chan->session; | |
6261 | ||
7972aab2 | 6262 | registry = get_session_registry(ua_sess); |
fad1ed2f JR |
6263 | if (!registry) { |
6264 | DBG("Application session is being torn down. Abort event notify"); | |
6265 | ret = 0; | |
6266 | goto error_rcu_unlock; | |
6267 | } | |
7972aab2 DG |
6268 | |
6269 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
6270 | chan_reg_key = ua_chan->tracing_channel_id; | |
6271 | } else { | |
6272 | chan_reg_key = ua_chan->key; | |
6273 | } | |
6274 | ||
6275 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 6276 | |
d5d629b5 DG |
6277 | /* |
6278 | * From this point on, this call acquires the ownership of the sig, fields | |
6279 | * and model_emf_uri meaning any free are done inside it if needed. These | |
6280 | * three variables MUST NOT be read/write after this. | |
6281 | */ | |
7972aab2 | 6282 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
2106efa0 PP |
6283 | sobjd, cobjd, name, sig, nr_fields, fields, |
6284 | loglevel_value, model_emf_uri, ua_sess->buffer_type, | |
6285 | &event_id, app); | |
fad1ed2f JR |
6286 | sig = NULL; |
6287 | fields = NULL; | |
6288 | model_emf_uri = NULL; | |
d0b96690 DG |
6289 | |
6290 | /* | |
6291 | * The return value is returned to ustctl so in case of an error, the | |
6292 | * application can be notified. In case of an error, it's important not to | |
6293 | * return a negative error or else the application will get closed. | |
6294 | */ | |
6295 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
6296 | if (ret < 0) { | |
6297 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6298 | ERR("UST app reply event failed with ret %d", ret); | |
6299 | } else { | |
6300 | DBG3("UST app reply event failed. Application died"); | |
6301 | } | |
6302 | /* | |
6303 | * No need to wipe the create event since the application socket will | |
6304 | * get close on error hence cleaning up everything by itself. | |
6305 | */ | |
6306 | goto error; | |
6307 | } | |
6308 | ||
7972aab2 DG |
6309 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
6310 | name, event_id); | |
d88aee68 | 6311 | |
d0b96690 | 6312 | error: |
7972aab2 | 6313 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 6314 | error_rcu_unlock: |
d0b96690 | 6315 | rcu_read_unlock(); |
fad1ed2f JR |
6316 | free(sig); |
6317 | free(fields); | |
6318 | free(model_emf_uri); | |
d0b96690 DG |
6319 | return ret; |
6320 | } | |
6321 | ||
10b56aef MD |
6322 | /* |
6323 | * Add enum to the UST session registry. Once done, this replies to the | |
6324 | * application with the appropriate error code. | |
6325 | * | |
6326 | * The session UST registry lock is acquired within this function. | |
6327 | * | |
6328 | * On success 0 is returned else a negative value. | |
6329 | */ | |
6330 | static int add_enum_ust_registry(int sock, int sobjd, char *name, | |
6331 | struct ustctl_enum_entry *entries, size_t nr_entries) | |
6332 | { | |
6333 | int ret = 0, ret_code; | |
6334 | struct ust_app *app; | |
6335 | struct ust_app_session *ua_sess; | |
6336 | struct ust_registry_session *registry; | |
6337 | uint64_t enum_id = -1ULL; | |
6338 | ||
6339 | rcu_read_lock(); | |
6340 | ||
6341 | /* Lookup application. If not found, there is a code flow error. */ | |
6342 | app = find_app_by_notify_sock(sock); | |
6343 | if (!app) { | |
6344 | /* Return an error since this is not an error */ | |
6345 | DBG("Application socket %d is being torn down. Aborting enum registration", | |
6346 | sock); | |
6347 | free(entries); | |
6348 | goto error_rcu_unlock; | |
6349 | } | |
6350 | ||
6351 | /* Lookup session by UST object descriptor. */ | |
6352 | ua_sess = find_session_by_objd(app, sobjd); | |
6353 | if (!ua_sess) { | |
6354 | /* Return an error since this is not an error */ | |
fad1ed2f | 6355 | DBG("Application session is being torn down (session not found). Aborting enum registration."); |
10b56aef MD |
6356 | free(entries); |
6357 | goto error_rcu_unlock; | |
6358 | } | |
6359 | ||
6360 | registry = get_session_registry(ua_sess); | |
fad1ed2f JR |
6361 | if (!registry) { |
6362 | DBG("Application session is being torn down (registry not found). Aborting enum registration."); | |
6363 | free(entries); | |
6364 | goto error_rcu_unlock; | |
6365 | } | |
10b56aef MD |
6366 | |
6367 | pthread_mutex_lock(®istry->lock); | |
6368 | ||
6369 | /* | |
6370 | * From this point on, the callee acquires the ownership of | |
6371 | * entries. The variable entries MUST NOT be read/written after | |
6372 | * call. | |
6373 | */ | |
6374 | ret_code = ust_registry_create_or_find_enum(registry, sobjd, name, | |
6375 | entries, nr_entries, &enum_id); | |
6376 | entries = NULL; | |
6377 | ||
6378 | /* | |
6379 | * The return value is returned to ustctl so in case of an error, the | |
6380 | * application can be notified. In case of an error, it's important not to | |
6381 | * return a negative error or else the application will get closed. | |
6382 | */ | |
6383 | ret = ustctl_reply_register_enum(sock, enum_id, ret_code); | |
6384 | if (ret < 0) { | |
6385 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6386 | ERR("UST app reply enum failed with ret %d", ret); | |
6387 | } else { | |
6388 | DBG3("UST app reply enum failed. Application died"); | |
6389 | } | |
6390 | /* | |
6391 | * No need to wipe the create enum since the application socket will | |
6392 | * get close on error hence cleaning up everything by itself. | |
6393 | */ | |
6394 | goto error; | |
6395 | } | |
6396 | ||
6397 | DBG3("UST registry enum %s added successfully or already found", name); | |
6398 | ||
6399 | error: | |
6400 | pthread_mutex_unlock(®istry->lock); | |
6401 | error_rcu_unlock: | |
6402 | rcu_read_unlock(); | |
6403 | return ret; | |
6404 | } | |
6405 | ||
d88aee68 DG |
6406 | /* |
6407 | * Handle application notification through the given notify socket. | |
6408 | * | |
6409 | * Return 0 on success or else a negative value. | |
6410 | */ | |
d0b96690 DG |
6411 | int ust_app_recv_notify(int sock) |
6412 | { | |
6413 | int ret; | |
6414 | enum ustctl_notify_cmd cmd; | |
6415 | ||
6416 | DBG3("UST app receiving notify from sock %d", sock); | |
6417 | ||
6418 | ret = ustctl_recv_notify(sock, &cmd); | |
6419 | if (ret < 0) { | |
6420 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6421 | ERR("UST app recv notify failed with ret %d", ret); | |
6422 | } else { | |
6423 | DBG3("UST app recv notify failed. Application died"); | |
6424 | } | |
6425 | goto error; | |
6426 | } | |
6427 | ||
6428 | switch (cmd) { | |
6429 | case USTCTL_NOTIFY_CMD_EVENT: | |
6430 | { | |
2106efa0 | 6431 | int sobjd, cobjd, loglevel_value; |
fc4b93fa | 6432 | char name[LTTNG_UST_ABI_SYM_NAME_LEN], *sig, *model_emf_uri; |
d0b96690 DG |
6433 | size_t nr_fields; |
6434 | struct ustctl_field *fields; | |
6435 | ||
6436 | DBG2("UST app ustctl register event received"); | |
6437 | ||
2106efa0 PP |
6438 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, |
6439 | &loglevel_value, &sig, &nr_fields, &fields, | |
6440 | &model_emf_uri); | |
d0b96690 DG |
6441 | if (ret < 0) { |
6442 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6443 | ERR("UST app recv event failed with ret %d", ret); | |
6444 | } else { | |
6445 | DBG3("UST app recv event failed. Application died"); | |
6446 | } | |
6447 | goto error; | |
6448 | } | |
6449 | ||
d5d629b5 DG |
6450 | /* |
6451 | * Add event to the UST registry coming from the notify socket. This | |
6452 | * call will free if needed the sig, fields and model_emf_uri. This | |
6453 | * code path loses the ownsership of these variables and transfer them | |
6454 | * to the this function. | |
6455 | */ | |
d0b96690 | 6456 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
2106efa0 | 6457 | fields, loglevel_value, model_emf_uri); |
d0b96690 DG |
6458 | if (ret < 0) { |
6459 | goto error; | |
6460 | } | |
6461 | ||
6462 | break; | |
6463 | } | |
6464 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
6465 | { | |
6466 | int sobjd, cobjd; | |
6467 | size_t nr_fields; | |
6468 | struct ustctl_field *fields; | |
6469 | ||
6470 | DBG2("UST app ustctl register channel received"); | |
6471 | ||
6472 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
6473 | &fields); | |
6474 | if (ret < 0) { | |
6475 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6476 | ERR("UST app recv channel failed with ret %d", ret); | |
6477 | } else { | |
6478 | DBG3("UST app recv channel failed. Application died"); | |
6479 | } | |
6480 | goto error; | |
6481 | } | |
6482 | ||
d5d629b5 DG |
6483 | /* |
6484 | * The fields ownership are transfered to this function call meaning | |
6485 | * that if needed it will be freed. After this, it's invalid to access | |
6486 | * fields or clean it up. | |
6487 | */ | |
8eede835 | 6488 | ret = reply_ust_register_channel(sock, cobjd, nr_fields, |
d0b96690 DG |
6489 | fields); |
6490 | if (ret < 0) { | |
6491 | goto error; | |
6492 | } | |
6493 | ||
6494 | break; | |
6495 | } | |
10b56aef MD |
6496 | case USTCTL_NOTIFY_CMD_ENUM: |
6497 | { | |
6498 | int sobjd; | |
fc4b93fa | 6499 | char name[LTTNG_UST_ABI_SYM_NAME_LEN]; |
10b56aef MD |
6500 | size_t nr_entries; |
6501 | struct ustctl_enum_entry *entries; | |
6502 | ||
6503 | DBG2("UST app ustctl register enum received"); | |
6504 | ||
6505 | ret = ustctl_recv_register_enum(sock, &sobjd, name, | |
6506 | &entries, &nr_entries); | |
6507 | if (ret < 0) { | |
6508 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6509 | ERR("UST app recv enum failed with ret %d", ret); | |
6510 | } else { | |
6511 | DBG3("UST app recv enum failed. Application died"); | |
6512 | } | |
6513 | goto error; | |
6514 | } | |
6515 | ||
6516 | /* Callee assumes ownership of entries */ | |
6517 | ret = add_enum_ust_registry(sock, sobjd, name, | |
6518 | entries, nr_entries); | |
6519 | if (ret < 0) { | |
6520 | goto error; | |
6521 | } | |
6522 | ||
6523 | break; | |
6524 | } | |
d0b96690 DG |
6525 | default: |
6526 | /* Should NEVER happen. */ | |
6527 | assert(0); | |
6528 | } | |
6529 | ||
6530 | error: | |
6531 | return ret; | |
6532 | } | |
d88aee68 DG |
6533 | |
6534 | /* | |
6535 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
6536 | * corresponding application. On failure, the call_rcu to close the socket is | |
6537 | * executed. If an application is found, it tries to delete it from the notify | |
6538 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
6539 | * | |
6540 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
6541 | * call RCU is not done but the rest of the cleanup is. | |
6542 | */ | |
6543 | void ust_app_notify_sock_unregister(int sock) | |
6544 | { | |
6545 | int err_enomem = 0; | |
6546 | struct lttng_ht_iter iter; | |
6547 | struct ust_app *app; | |
6548 | struct ust_app_notify_sock_obj *obj; | |
6549 | ||
6550 | assert(sock >= 0); | |
6551 | ||
6552 | rcu_read_lock(); | |
6553 | ||
6554 | obj = zmalloc(sizeof(*obj)); | |
6555 | if (!obj) { | |
6556 | /* | |
6557 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
6558 | * procedure but the call_rcu will not be called. In this case, we | |
6559 | * accept the fd leak rather than possibly creating an unsynchronized | |
6560 | * state between threads. | |
6561 | * | |
6562 | * TODO: The notify object should be created once the notify socket is | |
6563 | * registered and stored independantely from the ust app object. The | |
6564 | * tricky part is to synchronize the teardown of the application and | |
6565 | * this notify object. Let's keep that in mind so we can avoid this | |
6566 | * kind of shenanigans with ENOMEM in the teardown path. | |
6567 | */ | |
6568 | err_enomem = 1; | |
6569 | } else { | |
6570 | obj->fd = sock; | |
6571 | } | |
6572 | ||
6573 | DBG("UST app notify socket unregister %d", sock); | |
6574 | ||
6575 | /* | |
6576 | * Lookup application by notify socket. If this fails, this means that the | |
6577 | * hash table delete has already been done by the application | |
6578 | * unregistration process so we can safely close the notify socket in a | |
6579 | * call RCU. | |
6580 | */ | |
6581 | app = find_app_by_notify_sock(sock); | |
6582 | if (!app) { | |
6583 | goto close_socket; | |
6584 | } | |
6585 | ||
6586 | iter.iter.node = &app->notify_sock_n.node; | |
6587 | ||
6588 | /* | |
6589 | * Whatever happens here either we fail or succeed, in both cases we have | |
6590 | * to close the socket after a grace period to continue to the call RCU | |
6591 | * here. If the deletion is successful, the application is not visible | |
6592 | * anymore by other threads and is it fails it means that it was already | |
6593 | * deleted from the hash table so either way we just have to close the | |
6594 | * socket. | |
6595 | */ | |
6596 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
6597 | ||
6598 | close_socket: | |
6599 | rcu_read_unlock(); | |
6600 | ||
6601 | /* | |
6602 | * Close socket after a grace period to avoid for the socket to be reused | |
6603 | * before the application object is freed creating potential race between | |
6604 | * threads trying to add unique in the global hash table. | |
6605 | */ | |
6606 | if (!err_enomem) { | |
6607 | call_rcu(&obj->head, close_notify_sock_rcu); | |
6608 | } | |
6609 | } | |
f45e313d DG |
6610 | |
6611 | /* | |
6612 | * Destroy a ust app data structure and free its memory. | |
6613 | */ | |
6614 | void ust_app_destroy(struct ust_app *app) | |
6615 | { | |
6616 | if (!app) { | |
6617 | return; | |
6618 | } | |
6619 | ||
6620 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
6621 | } | |
6dc3064a DG |
6622 | |
6623 | /* | |
6624 | * Take a snapshot for a given UST session. The snapshot is sent to the given | |
6625 | * output. | |
6626 | * | |
9a654598 | 6627 | * Returns LTTNG_OK on success or a LTTNG_ERR error code. |
6dc3064a | 6628 | */ |
fb9a95c4 JG |
6629 | enum lttng_error_code ust_app_snapshot_record( |
6630 | const struct ltt_ust_session *usess, | |
348a81dc | 6631 | const struct consumer_output *output, int wait, |
d07ceecd | 6632 | uint64_t nb_packets_per_stream) |
6dc3064a DG |
6633 | { |
6634 | int ret = 0; | |
9a654598 | 6635 | enum lttng_error_code status = LTTNG_OK; |
6dc3064a DG |
6636 | struct lttng_ht_iter iter; |
6637 | struct ust_app *app; | |
affce97e | 6638 | char *trace_path = NULL; |
6dc3064a DG |
6639 | |
6640 | assert(usess); | |
6641 | assert(output); | |
6642 | ||
6643 | rcu_read_lock(); | |
6644 | ||
8c924c7b MD |
6645 | switch (usess->buffer_type) { |
6646 | case LTTNG_BUFFER_PER_UID: | |
6647 | { | |
6648 | struct buffer_reg_uid *reg; | |
6dc3064a | 6649 | |
8c924c7b MD |
6650 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
6651 | struct buffer_reg_channel *reg_chan; | |
6652 | struct consumer_socket *socket; | |
3b967712 | 6653 | char pathname[PATH_MAX]; |
5da88b0f | 6654 | size_t consumer_path_offset = 0; |
6dc3064a | 6655 | |
2b269489 JR |
6656 | if (!reg->registry->reg.ust->metadata_key) { |
6657 | /* Skip since no metadata is present */ | |
6658 | continue; | |
6659 | } | |
6660 | ||
8c924c7b MD |
6661 | /* Get consumer socket to use to push the metadata.*/ |
6662 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
6663 | usess->consumer); | |
6664 | if (!socket) { | |
9a654598 | 6665 | status = LTTNG_ERR_INVALID; |
8c924c7b MD |
6666 | goto error; |
6667 | } | |
6dc3064a | 6668 | |
8c924c7b MD |
6669 | memset(pathname, 0, sizeof(pathname)); |
6670 | ret = snprintf(pathname, sizeof(pathname), | |
5da88b0f | 6671 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH, |
8c924c7b MD |
6672 | reg->uid, reg->bits_per_long); |
6673 | if (ret < 0) { | |
6674 | PERROR("snprintf snapshot path"); | |
9a654598 | 6675 | status = LTTNG_ERR_INVALID; |
8c924c7b MD |
6676 | goto error; |
6677 | } | |
affce97e JG |
6678 | /* Free path allowed on previous iteration. */ |
6679 | free(trace_path); | |
5da88b0f MD |
6680 | trace_path = setup_channel_trace_path(usess->consumer, pathname, |
6681 | &consumer_path_offset); | |
3b967712 MD |
6682 | if (!trace_path) { |
6683 | status = LTTNG_ERR_INVALID; | |
6684 | goto error; | |
6685 | } | |
f3db82be | 6686 | /* Add the UST default trace dir to path. */ |
8c924c7b MD |
6687 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
6688 | reg_chan, node.node) { | |
9a654598 | 6689 | status = consumer_snapshot_channel(socket, |
e098433c JG |
6690 | reg_chan->consumer_key, |
6691 | output, 0, usess->uid, | |
5da88b0f | 6692 | usess->gid, &trace_path[consumer_path_offset], wait, |
d2956687 | 6693 | nb_packets_per_stream); |
9a654598 | 6694 | if (status != LTTNG_OK) { |
8c924c7b MD |
6695 | goto error; |
6696 | } | |
6697 | } | |
9a654598 | 6698 | status = consumer_snapshot_channel(socket, |
68808f4e | 6699 | reg->registry->reg.ust->metadata_key, output, 1, |
5da88b0f MD |
6700 | usess->uid, usess->gid, &trace_path[consumer_path_offset], |
6701 | wait, 0); | |
9a654598 | 6702 | if (status != LTTNG_OK) { |
8c924c7b MD |
6703 | goto error; |
6704 | } | |
af706bb7 | 6705 | } |
8c924c7b MD |
6706 | break; |
6707 | } | |
6708 | case LTTNG_BUFFER_PER_PID: | |
6709 | { | |
6710 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6711 | struct consumer_socket *socket; | |
6712 | struct lttng_ht_iter chan_iter; | |
6713 | struct ust_app_channel *ua_chan; | |
6714 | struct ust_app_session *ua_sess; | |
6715 | struct ust_registry_session *registry; | |
3b967712 | 6716 | char pathname[PATH_MAX]; |
5da88b0f | 6717 | size_t consumer_path_offset = 0; |
8c924c7b MD |
6718 | |
6719 | ua_sess = lookup_session_by_app(usess, app); | |
6720 | if (!ua_sess) { | |
6721 | /* Session not associated with this app. */ | |
6722 | continue; | |
6723 | } | |
af706bb7 | 6724 | |
8c924c7b MD |
6725 | /* Get the right consumer socket for the application. */ |
6726 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
348a81dc | 6727 | output); |
8c924c7b | 6728 | if (!socket) { |
9a654598 | 6729 | status = LTTNG_ERR_INVALID; |
5c786ded JD |
6730 | goto error; |
6731 | } | |
6732 | ||
8c924c7b MD |
6733 | /* Add the UST default trace dir to path. */ |
6734 | memset(pathname, 0, sizeof(pathname)); | |
5da88b0f | 6735 | ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "/%s", |
8c924c7b | 6736 | ua_sess->path); |
6dc3064a | 6737 | if (ret < 0) { |
9a654598 | 6738 | status = LTTNG_ERR_INVALID; |
8c924c7b | 6739 | PERROR("snprintf snapshot path"); |
6dc3064a DG |
6740 | goto error; |
6741 | } | |
affce97e JG |
6742 | /* Free path allowed on previous iteration. */ |
6743 | free(trace_path); | |
5da88b0f MD |
6744 | trace_path = setup_channel_trace_path(usess->consumer, pathname, |
6745 | &consumer_path_offset); | |
3b967712 MD |
6746 | if (!trace_path) { |
6747 | status = LTTNG_ERR_INVALID; | |
6748 | goto error; | |
6749 | } | |
f3db82be | 6750 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, |
8c924c7b | 6751 | ua_chan, node.node) { |
9a654598 | 6752 | status = consumer_snapshot_channel(socket, |
470cc211 | 6753 | ua_chan->key, output, 0, |
ff588497 JR |
6754 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
6755 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
5da88b0f | 6756 | &trace_path[consumer_path_offset], wait, |
d2956687 | 6757 | nb_packets_per_stream); |
9a654598 JG |
6758 | switch (status) { |
6759 | case LTTNG_OK: | |
6760 | break; | |
6761 | case LTTNG_ERR_CHAN_NOT_FOUND: | |
6762 | continue; | |
6763 | default: | |
8c924c7b MD |
6764 | goto error; |
6765 | } | |
6766 | } | |
6767 | ||
6768 | registry = get_session_registry(ua_sess); | |
fad1ed2f | 6769 | if (!registry) { |
9bbfb88c MD |
6770 | DBG("Application session is being torn down. Skip application."); |
6771 | continue; | |
fad1ed2f | 6772 | } |
9a654598 | 6773 | status = consumer_snapshot_channel(socket, |
470cc211 | 6774 | registry->metadata_key, output, 1, |
ff588497 JR |
6775 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
6776 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
5da88b0f | 6777 | &trace_path[consumer_path_offset], wait, 0); |
9a654598 JG |
6778 | switch (status) { |
6779 | case LTTNG_OK: | |
6780 | break; | |
6781 | case LTTNG_ERR_CHAN_NOT_FOUND: | |
6782 | continue; | |
6783 | default: | |
8c924c7b MD |
6784 | goto error; |
6785 | } | |
6786 | } | |
6787 | break; | |
6788 | } | |
6789 | default: | |
6790 | assert(0); | |
6791 | break; | |
6dc3064a DG |
6792 | } |
6793 | ||
6794 | error: | |
affce97e | 6795 | free(trace_path); |
6dc3064a | 6796 | rcu_read_unlock(); |
9a654598 | 6797 | return status; |
6dc3064a | 6798 | } |
5c786ded JD |
6799 | |
6800 | /* | |
d07ceecd | 6801 | * Return the size taken by one more packet per stream. |
5c786ded | 6802 | */ |
fb9a95c4 JG |
6803 | uint64_t ust_app_get_size_one_more_packet_per_stream( |
6804 | const struct ltt_ust_session *usess, uint64_t cur_nr_packets) | |
5c786ded | 6805 | { |
d07ceecd | 6806 | uint64_t tot_size = 0; |
5c786ded JD |
6807 | struct ust_app *app; |
6808 | struct lttng_ht_iter iter; | |
6809 | ||
6810 | assert(usess); | |
6811 | ||
6812 | switch (usess->buffer_type) { | |
6813 | case LTTNG_BUFFER_PER_UID: | |
6814 | { | |
6815 | struct buffer_reg_uid *reg; | |
6816 | ||
6817 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
6818 | struct buffer_reg_channel *reg_chan; | |
6819 | ||
b7064eaa | 6820 | rcu_read_lock(); |
5c786ded JD |
6821 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
6822 | reg_chan, node.node) { | |
d07ceecd MD |
6823 | if (cur_nr_packets >= reg_chan->num_subbuf) { |
6824 | /* | |
6825 | * Don't take channel into account if we | |
6826 | * already grab all its packets. | |
6827 | */ | |
6828 | continue; | |
6829 | } | |
6830 | tot_size += reg_chan->subbuf_size * reg_chan->stream_count; | |
5c786ded | 6831 | } |
b7064eaa | 6832 | rcu_read_unlock(); |
5c786ded JD |
6833 | } |
6834 | break; | |
6835 | } | |
6836 | case LTTNG_BUFFER_PER_PID: | |
6837 | { | |
6838 | rcu_read_lock(); | |
6839 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6840 | struct ust_app_channel *ua_chan; | |
6841 | struct ust_app_session *ua_sess; | |
6842 | struct lttng_ht_iter chan_iter; | |
6843 | ||
6844 | ua_sess = lookup_session_by_app(usess, app); | |
6845 | if (!ua_sess) { | |
6846 | /* Session not associated with this app. */ | |
6847 | continue; | |
6848 | } | |
6849 | ||
6850 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
6851 | ua_chan, node.node) { | |
d07ceecd MD |
6852 | if (cur_nr_packets >= ua_chan->attr.num_subbuf) { |
6853 | /* | |
6854 | * Don't take channel into account if we | |
6855 | * already grab all its packets. | |
6856 | */ | |
6857 | continue; | |
6858 | } | |
6859 | tot_size += ua_chan->attr.subbuf_size * ua_chan->streams.count; | |
5c786ded JD |
6860 | } |
6861 | } | |
6862 | rcu_read_unlock(); | |
6863 | break; | |
6864 | } | |
6865 | default: | |
6866 | assert(0); | |
6867 | break; | |
6868 | } | |
6869 | ||
d07ceecd | 6870 | return tot_size; |
5c786ded | 6871 | } |
fb83fe64 JD |
6872 | |
6873 | int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id, | |
6874 | struct cds_list_head *buffer_reg_uid_list, | |
6875 | struct consumer_output *consumer, uint64_t uchan_id, | |
6876 | int overwrite, uint64_t *discarded, uint64_t *lost) | |
6877 | { | |
6878 | int ret; | |
6879 | uint64_t consumer_chan_key; | |
6880 | ||
70dd8162 MD |
6881 | *discarded = 0; |
6882 | *lost = 0; | |
6883 | ||
fb83fe64 | 6884 | ret = buffer_reg_uid_consumer_channel_key( |
76604852 | 6885 | buffer_reg_uid_list, uchan_id, &consumer_chan_key); |
fb83fe64 | 6886 | if (ret < 0) { |
70dd8162 MD |
6887 | /* Not found */ |
6888 | ret = 0; | |
fb83fe64 JD |
6889 | goto end; |
6890 | } | |
6891 | ||
6892 | if (overwrite) { | |
6893 | ret = consumer_get_lost_packets(ust_session_id, | |
6894 | consumer_chan_key, consumer, lost); | |
6895 | } else { | |
6896 | ret = consumer_get_discarded_events(ust_session_id, | |
6897 | consumer_chan_key, consumer, discarded); | |
6898 | } | |
6899 | ||
6900 | end: | |
6901 | return ret; | |
6902 | } | |
6903 | ||
6904 | int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess, | |
6905 | struct ltt_ust_channel *uchan, | |
6906 | struct consumer_output *consumer, int overwrite, | |
6907 | uint64_t *discarded, uint64_t *lost) | |
6908 | { | |
6909 | int ret = 0; | |
6910 | struct lttng_ht_iter iter; | |
6911 | struct lttng_ht_node_str *ua_chan_node; | |
6912 | struct ust_app *app; | |
6913 | struct ust_app_session *ua_sess; | |
6914 | struct ust_app_channel *ua_chan; | |
6915 | ||
70dd8162 MD |
6916 | *discarded = 0; |
6917 | *lost = 0; | |
6918 | ||
fb83fe64 JD |
6919 | rcu_read_lock(); |
6920 | /* | |
70dd8162 MD |
6921 | * Iterate over every registered applications. Sum counters for |
6922 | * all applications containing requested session and channel. | |
fb83fe64 JD |
6923 | */ |
6924 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6925 | struct lttng_ht_iter uiter; | |
6926 | ||
6927 | ua_sess = lookup_session_by_app(usess, app); | |
6928 | if (ua_sess == NULL) { | |
6929 | continue; | |
6930 | } | |
6931 | ||
6932 | /* Get channel */ | |
ee022399 | 6933 | lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &uiter); |
fb83fe64 JD |
6934 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); |
6935 | /* If the session is found for the app, the channel must be there */ | |
6936 | assert(ua_chan_node); | |
6937 | ||
6938 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
6939 | ||
6940 | if (overwrite) { | |
70dd8162 MD |
6941 | uint64_t _lost; |
6942 | ||
fb83fe64 | 6943 | ret = consumer_get_lost_packets(usess->id, ua_chan->key, |
70dd8162 MD |
6944 | consumer, &_lost); |
6945 | if (ret < 0) { | |
6946 | break; | |
6947 | } | |
6948 | (*lost) += _lost; | |
fb83fe64 | 6949 | } else { |
70dd8162 MD |
6950 | uint64_t _discarded; |
6951 | ||
fb83fe64 | 6952 | ret = consumer_get_discarded_events(usess->id, |
70dd8162 MD |
6953 | ua_chan->key, consumer, &_discarded); |
6954 | if (ret < 0) { | |
6955 | break; | |
6956 | } | |
6957 | (*discarded) += _discarded; | |
fb83fe64 | 6958 | } |
fb83fe64 JD |
6959 | } |
6960 | ||
fb83fe64 JD |
6961 | rcu_read_unlock(); |
6962 | return ret; | |
6963 | } | |
c2561365 JD |
6964 | |
6965 | static | |
6966 | int ust_app_regenerate_statedump(struct ltt_ust_session *usess, | |
6967 | struct ust_app *app) | |
6968 | { | |
6969 | int ret = 0; | |
6970 | struct ust_app_session *ua_sess; | |
6971 | ||
6972 | DBG("Regenerating the metadata for ust app pid %d", app->pid); | |
6973 | ||
6974 | rcu_read_lock(); | |
6975 | ||
6976 | ua_sess = lookup_session_by_app(usess, app); | |
6977 | if (ua_sess == NULL) { | |
6978 | /* The session is in teardown process. Ignore and continue. */ | |
6979 | goto end; | |
6980 | } | |
6981 | ||
6982 | pthread_mutex_lock(&ua_sess->lock); | |
6983 | ||
6984 | if (ua_sess->deleted) { | |
6985 | goto end_unlock; | |
6986 | } | |
6987 | ||
6988 | pthread_mutex_lock(&app->sock_lock); | |
6989 | ret = ustctl_regenerate_statedump(app->sock, ua_sess->handle); | |
6990 | pthread_mutex_unlock(&app->sock_lock); | |
6991 | ||
6992 | end_unlock: | |
6993 | pthread_mutex_unlock(&ua_sess->lock); | |
6994 | ||
6995 | end: | |
6996 | rcu_read_unlock(); | |
6997 | health_code_update(); | |
6998 | return ret; | |
6999 | } | |
7000 | ||
7001 | /* | |
7002 | * Regenerate the statedump for each app in the session. | |
7003 | */ | |
7004 | int ust_app_regenerate_statedump_all(struct ltt_ust_session *usess) | |
7005 | { | |
7006 | int ret = 0; | |
7007 | struct lttng_ht_iter iter; | |
7008 | struct ust_app *app; | |
7009 | ||
7010 | DBG("Regenerating the metadata for all UST apps"); | |
7011 | ||
7012 | rcu_read_lock(); | |
7013 | ||
7014 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
7015 | if (!app->compatible) { | |
7016 | continue; | |
7017 | } | |
7018 | ||
7019 | ret = ust_app_regenerate_statedump(usess, app); | |
7020 | if (ret < 0) { | |
7021 | /* Continue to the next app even on error */ | |
7022 | continue; | |
7023 | } | |
7024 | } | |
7025 | ||
7026 | rcu_read_unlock(); | |
7027 | ||
7028 | return 0; | |
7029 | } | |
5c408ad8 JD |
7030 | |
7031 | /* | |
7032 | * Rotate all the channels of a session. | |
7033 | * | |
6f6d3b69 | 7034 | * Return LTTNG_OK on success or else an LTTng error code. |
5c408ad8 | 7035 | */ |
6f6d3b69 | 7036 | enum lttng_error_code ust_app_rotate_session(struct ltt_session *session) |
5c408ad8 | 7037 | { |
6f6d3b69 MD |
7038 | int ret; |
7039 | enum lttng_error_code cmd_ret = LTTNG_OK; | |
5c408ad8 JD |
7040 | struct lttng_ht_iter iter; |
7041 | struct ust_app *app; | |
7042 | struct ltt_ust_session *usess = session->ust_session; | |
5c408ad8 JD |
7043 | |
7044 | assert(usess); | |
7045 | ||
7046 | rcu_read_lock(); | |
7047 | ||
7048 | switch (usess->buffer_type) { | |
7049 | case LTTNG_BUFFER_PER_UID: | |
7050 | { | |
7051 | struct buffer_reg_uid *reg; | |
7052 | ||
7053 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
7054 | struct buffer_reg_channel *reg_chan; | |
7055 | struct consumer_socket *socket; | |
7056 | ||
14d3fca9 JR |
7057 | if (!reg->registry->reg.ust->metadata_key) { |
7058 | /* Skip since no metadata is present */ | |
7059 | continue; | |
7060 | } | |
7061 | ||
5c408ad8 JD |
7062 | /* Get consumer socket to use to push the metadata.*/ |
7063 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
7064 | usess->consumer); | |
7065 | if (!socket) { | |
6f6d3b69 | 7066 | cmd_ret = LTTNG_ERR_INVALID; |
5c408ad8 JD |
7067 | goto error; |
7068 | } | |
7069 | ||
5c408ad8 JD |
7070 | /* Rotate the data channels. */ |
7071 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
7072 | reg_chan, node.node) { | |
5c408ad8 JD |
7073 | ret = consumer_rotate_channel(socket, |
7074 | reg_chan->consumer_key, | |
7075 | usess->uid, usess->gid, | |
d2956687 JG |
7076 | usess->consumer, |
7077 | /* is_metadata_channel */ false); | |
5c408ad8 | 7078 | if (ret < 0) { |
6f6d3b69 | 7079 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
7080 | goto error; |
7081 | } | |
7082 | } | |
7083 | ||
7084 | (void) push_metadata(reg->registry->reg.ust, usess->consumer); | |
7085 | ||
7086 | ret = consumer_rotate_channel(socket, | |
7087 | reg->registry->reg.ust->metadata_key, | |
7088 | usess->uid, usess->gid, | |
d2956687 JG |
7089 | usess->consumer, |
7090 | /* is_metadata_channel */ true); | |
5c408ad8 | 7091 | if (ret < 0) { |
6f6d3b69 | 7092 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
7093 | goto error; |
7094 | } | |
5c408ad8 JD |
7095 | } |
7096 | break; | |
7097 | } | |
7098 | case LTTNG_BUFFER_PER_PID: | |
7099 | { | |
7100 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
7101 | struct consumer_socket *socket; | |
7102 | struct lttng_ht_iter chan_iter; | |
7103 | struct ust_app_channel *ua_chan; | |
7104 | struct ust_app_session *ua_sess; | |
7105 | struct ust_registry_session *registry; | |
7106 | ||
7107 | ua_sess = lookup_session_by_app(usess, app); | |
7108 | if (!ua_sess) { | |
7109 | /* Session not associated with this app. */ | |
7110 | continue; | |
7111 | } | |
5c408ad8 JD |
7112 | |
7113 | /* Get the right consumer socket for the application. */ | |
7114 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
7115 | usess->consumer); | |
7116 | if (!socket) { | |
6f6d3b69 | 7117 | cmd_ret = LTTNG_ERR_INVALID; |
5c408ad8 JD |
7118 | goto error; |
7119 | } | |
7120 | ||
7121 | registry = get_session_registry(ua_sess); | |
7122 | if (!registry) { | |
6f6d3b69 MD |
7123 | DBG("Application session is being torn down. Skip application."); |
7124 | continue; | |
5c408ad8 JD |
7125 | } |
7126 | ||
5c408ad8 JD |
7127 | /* Rotate the data channels. */ |
7128 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
7129 | ua_chan, node.node) { | |
470cc211 JG |
7130 | ret = consumer_rotate_channel(socket, |
7131 | ua_chan->key, | |
ff588497 JR |
7132 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
7133 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
d2956687 JG |
7134 | ua_sess->consumer, |
7135 | /* is_metadata_channel */ false); | |
5c408ad8 | 7136 | if (ret < 0) { |
6f6d3b69 MD |
7137 | /* Per-PID buffer and application going away. */ |
7138 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) | |
7139 | continue; | |
7140 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; | |
5c408ad8 JD |
7141 | goto error; |
7142 | } | |
7143 | } | |
7144 | ||
7145 | /* Rotate the metadata channel. */ | |
7146 | (void) push_metadata(registry, usess->consumer); | |
470cc211 JG |
7147 | ret = consumer_rotate_channel(socket, |
7148 | registry->metadata_key, | |
ff588497 JR |
7149 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
7150 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
d2956687 JG |
7151 | ua_sess->consumer, |
7152 | /* is_metadata_channel */ true); | |
5c408ad8 | 7153 | if (ret < 0) { |
6f6d3b69 MD |
7154 | /* Per-PID buffer and application going away. */ |
7155 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) | |
7156 | continue; | |
7157 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; | |
5c408ad8 JD |
7158 | goto error; |
7159 | } | |
5c408ad8 JD |
7160 | } |
7161 | break; | |
7162 | } | |
7163 | default: | |
7164 | assert(0); | |
7165 | break; | |
7166 | } | |
7167 | ||
6f6d3b69 | 7168 | cmd_ret = LTTNG_OK; |
5c408ad8 JD |
7169 | |
7170 | error: | |
7171 | rcu_read_unlock(); | |
6f6d3b69 | 7172 | return cmd_ret; |
5c408ad8 | 7173 | } |
d2956687 JG |
7174 | |
7175 | enum lttng_error_code ust_app_create_channel_subdirectories( | |
7176 | const struct ltt_ust_session *usess) | |
7177 | { | |
7178 | enum lttng_error_code ret = LTTNG_OK; | |
7179 | struct lttng_ht_iter iter; | |
7180 | enum lttng_trace_chunk_status chunk_status; | |
7181 | char *pathname_index; | |
7182 | int fmt_ret; | |
7183 | ||
7184 | assert(usess->current_trace_chunk); | |
7185 | rcu_read_lock(); | |
7186 | ||
7187 | switch (usess->buffer_type) { | |
7188 | case LTTNG_BUFFER_PER_UID: | |
7189 | { | |
7190 | struct buffer_reg_uid *reg; | |
7191 | ||
7192 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
7193 | fmt_ret = asprintf(&pathname_index, | |
5da88b0f | 7194 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH "/" DEFAULT_INDEX_DIR, |
d2956687 JG |
7195 | reg->uid, reg->bits_per_long); |
7196 | if (fmt_ret < 0) { | |
7197 | ERR("Failed to format channel index directory"); | |
7198 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
7199 | goto error; | |
7200 | } | |
7201 | ||
7202 | /* | |
7203 | * Create the index subdirectory which will take care | |
7204 | * of implicitly creating the channel's path. | |
7205 | */ | |
7206 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
7207 | usess->current_trace_chunk, | |
7208 | pathname_index); | |
7209 | free(pathname_index); | |
7210 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
7211 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
7212 | goto error; | |
7213 | } | |
7214 | } | |
7215 | break; | |
7216 | } | |
7217 | case LTTNG_BUFFER_PER_PID: | |
7218 | { | |
7219 | struct ust_app *app; | |
7220 | ||
495dece5 MD |
7221 | /* |
7222 | * Create the toplevel ust/ directory in case no apps are running. | |
7223 | */ | |
7224 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
7225 | usess->current_trace_chunk, | |
7226 | DEFAULT_UST_TRACE_DIR); | |
7227 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
7228 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
7229 | goto error; | |
7230 | } | |
7231 | ||
d2956687 JG |
7232 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, |
7233 | pid_n.node) { | |
7234 | struct ust_app_session *ua_sess; | |
7235 | struct ust_registry_session *registry; | |
7236 | ||
7237 | ua_sess = lookup_session_by_app(usess, app); | |
7238 | if (!ua_sess) { | |
7239 | /* Session not associated with this app. */ | |
7240 | continue; | |
7241 | } | |
7242 | ||
7243 | registry = get_session_registry(ua_sess); | |
7244 | if (!registry) { | |
7245 | DBG("Application session is being torn down. Skip application."); | |
7246 | continue; | |
7247 | } | |
7248 | ||
7249 | fmt_ret = asprintf(&pathname_index, | |
5da88b0f | 7250 | DEFAULT_UST_TRACE_DIR "/%s/" DEFAULT_INDEX_DIR, |
d2956687 JG |
7251 | ua_sess->path); |
7252 | if (fmt_ret < 0) { | |
7253 | ERR("Failed to format channel index directory"); | |
7254 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
7255 | goto error; | |
7256 | } | |
7257 | /* | |
7258 | * Create the index subdirectory which will take care | |
7259 | * of implicitly creating the channel's path. | |
7260 | */ | |
7261 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
7262 | usess->current_trace_chunk, | |
7263 | pathname_index); | |
7264 | free(pathname_index); | |
7265 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
7266 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
7267 | goto error; | |
7268 | } | |
7269 | } | |
7270 | break; | |
7271 | } | |
7272 | default: | |
7273 | abort(); | |
7274 | } | |
7275 | ||
7276 | ret = LTTNG_OK; | |
7277 | error: | |
7278 | rcu_read_unlock(); | |
7279 | return ret; | |
7280 | } | |
4a9b9759 MD |
7281 | |
7282 | /* | |
7283 | * Clear all the channels of a session. | |
7284 | * | |
7285 | * Return LTTNG_OK on success or else an LTTng error code. | |
7286 | */ | |
7287 | enum lttng_error_code ust_app_clear_session(struct ltt_session *session) | |
7288 | { | |
7289 | int ret; | |
7290 | enum lttng_error_code cmd_ret = LTTNG_OK; | |
7291 | struct lttng_ht_iter iter; | |
7292 | struct ust_app *app; | |
7293 | struct ltt_ust_session *usess = session->ust_session; | |
7294 | ||
7295 | assert(usess); | |
7296 | ||
7297 | rcu_read_lock(); | |
7298 | ||
7299 | if (usess->active) { | |
7300 | ERR("Expecting inactive session %s (%" PRIu64 ")", session->name, session->id); | |
7301 | cmd_ret = LTTNG_ERR_FATAL; | |
7302 | goto end; | |
7303 | } | |
7304 | ||
7305 | switch (usess->buffer_type) { | |
7306 | case LTTNG_BUFFER_PER_UID: | |
7307 | { | |
7308 | struct buffer_reg_uid *reg; | |
7309 | ||
7310 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
7311 | struct buffer_reg_channel *reg_chan; | |
7312 | struct consumer_socket *socket; | |
7313 | ||
7314 | /* Get consumer socket to use to push the metadata.*/ | |
7315 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
7316 | usess->consumer); | |
7317 | if (!socket) { | |
7318 | cmd_ret = LTTNG_ERR_INVALID; | |
7319 | goto error_socket; | |
7320 | } | |
7321 | ||
7322 | /* Clear the data channels. */ | |
7323 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
7324 | reg_chan, node.node) { | |
7325 | ret = consumer_clear_channel(socket, | |
7326 | reg_chan->consumer_key); | |
7327 | if (ret < 0) { | |
7328 | goto error; | |
7329 | } | |
7330 | } | |
7331 | ||
7332 | (void) push_metadata(reg->registry->reg.ust, usess->consumer); | |
7333 | ||
7334 | /* | |
7335 | * Clear the metadata channel. | |
7336 | * Metadata channel is not cleared per se but we still need to | |
7337 | * perform a rotation operation on it behind the scene. | |
7338 | */ | |
7339 | ret = consumer_clear_channel(socket, | |
7340 | reg->registry->reg.ust->metadata_key); | |
7341 | if (ret < 0) { | |
7342 | goto error; | |
7343 | } | |
7344 | } | |
7345 | break; | |
7346 | } | |
7347 | case LTTNG_BUFFER_PER_PID: | |
7348 | { | |
7349 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
7350 | struct consumer_socket *socket; | |
7351 | struct lttng_ht_iter chan_iter; | |
7352 | struct ust_app_channel *ua_chan; | |
7353 | struct ust_app_session *ua_sess; | |
7354 | struct ust_registry_session *registry; | |
7355 | ||
7356 | ua_sess = lookup_session_by_app(usess, app); | |
7357 | if (!ua_sess) { | |
7358 | /* Session not associated with this app. */ | |
7359 | continue; | |
7360 | } | |
7361 | ||
7362 | /* Get the right consumer socket for the application. */ | |
7363 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
7364 | usess->consumer); | |
7365 | if (!socket) { | |
7366 | cmd_ret = LTTNG_ERR_INVALID; | |
7367 | goto error_socket; | |
7368 | } | |
7369 | ||
7370 | registry = get_session_registry(ua_sess); | |
7371 | if (!registry) { | |
7372 | DBG("Application session is being torn down. Skip application."); | |
7373 | continue; | |
7374 | } | |
7375 | ||
7376 | /* Clear the data channels. */ | |
7377 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
7378 | ua_chan, node.node) { | |
7379 | ret = consumer_clear_channel(socket, ua_chan->key); | |
7380 | if (ret < 0) { | |
7381 | /* Per-PID buffer and application going away. */ | |
7382 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) { | |
7383 | continue; | |
7384 | } | |
7385 | goto error; | |
7386 | } | |
7387 | } | |
7388 | ||
7389 | (void) push_metadata(registry, usess->consumer); | |
7390 | ||
7391 | /* | |
7392 | * Clear the metadata channel. | |
7393 | * Metadata channel is not cleared per se but we still need to | |
7394 | * perform rotation operation on it behind the scene. | |
7395 | */ | |
7396 | ret = consumer_clear_channel(socket, registry->metadata_key); | |
7397 | if (ret < 0) { | |
7398 | /* Per-PID buffer and application going away. */ | |
7399 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) { | |
7400 | continue; | |
7401 | } | |
7402 | goto error; | |
7403 | } | |
7404 | } | |
7405 | break; | |
7406 | } | |
7407 | default: | |
7408 | assert(0); | |
7409 | break; | |
7410 | } | |
7411 | ||
7412 | cmd_ret = LTTNG_OK; | |
7413 | goto end; | |
7414 | ||
7415 | error: | |
7416 | switch (-ret) { | |
7417 | case LTTCOMM_CONSUMERD_RELAYD_CLEAR_DISALLOWED: | |
7418 | cmd_ret = LTTNG_ERR_CLEAR_RELAY_DISALLOWED; | |
7419 | break; | |
7420 | default: | |
7421 | cmd_ret = LTTNG_ERR_CLEAR_FAIL_CONSUMER; | |
7422 | } | |
7423 | ||
7424 | error_socket: | |
7425 | end: | |
7426 | rcu_read_unlock(); | |
7427 | return cmd_ret; | |
7428 | } | |
04ed9e10 JG |
7429 | |
7430 | /* | |
7431 | * This function skips the metadata channel as the begin/end timestamps of a | |
7432 | * metadata packet are useless. | |
7433 | * | |
7434 | * Moreover, opening a packet after a "clear" will cause problems for live | |
7435 | * sessions as it will introduce padding that was not part of the first trace | |
7436 | * chunk. The relay daemon expects the content of the metadata stream of | |
7437 | * successive metadata trace chunks to be strict supersets of one another. | |
7438 | * | |
7439 | * For example, flushing a packet at the beginning of the metadata stream of | |
7440 | * a trace chunk resulting from a "clear" session command will cause the | |
7441 | * size of the metadata stream of the new trace chunk to not match the size of | |
7442 | * the metadata stream of the original chunk. This will confuse the relay | |
7443 | * daemon as the same "offset" in a metadata stream will no longer point | |
7444 | * to the same content. | |
7445 | */ | |
7446 | enum lttng_error_code ust_app_open_packets(struct ltt_session *session) | |
7447 | { | |
7448 | enum lttng_error_code ret = LTTNG_OK; | |
7449 | struct lttng_ht_iter iter; | |
7450 | struct ltt_ust_session *usess = session->ust_session; | |
7451 | ||
7452 | assert(usess); | |
7453 | ||
7454 | rcu_read_lock(); | |
7455 | ||
7456 | switch (usess->buffer_type) { | |
7457 | case LTTNG_BUFFER_PER_UID: | |
7458 | { | |
7459 | struct buffer_reg_uid *reg; | |
7460 | ||
7461 | cds_list_for_each_entry ( | |
7462 | reg, &usess->buffer_reg_uid_list, lnode) { | |
7463 | struct buffer_reg_channel *reg_chan; | |
7464 | struct consumer_socket *socket; | |
7465 | ||
7466 | socket = consumer_find_socket_by_bitness( | |
7467 | reg->bits_per_long, usess->consumer); | |
7468 | if (!socket) { | |
7469 | ret = LTTNG_ERR_FATAL; | |
7470 | goto error; | |
7471 | } | |
7472 | ||
7473 | cds_lfht_for_each_entry(reg->registry->channels->ht, | |
7474 | &iter.iter, reg_chan, node.node) { | |
7475 | const int open_ret = | |
7476 | consumer_open_channel_packets( | |
7477 | socket, | |
7478 | reg_chan->consumer_key); | |
7479 | ||
7480 | if (open_ret < 0) { | |
7481 | ret = LTTNG_ERR_UNK; | |
7482 | goto error; | |
7483 | } | |
7484 | } | |
7485 | } | |
7486 | break; | |
7487 | } | |
7488 | case LTTNG_BUFFER_PER_PID: | |
7489 | { | |
7490 | struct ust_app *app; | |
7491 | ||
7492 | cds_lfht_for_each_entry ( | |
7493 | ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
7494 | struct consumer_socket *socket; | |
7495 | struct lttng_ht_iter chan_iter; | |
7496 | struct ust_app_channel *ua_chan; | |
7497 | struct ust_app_session *ua_sess; | |
7498 | struct ust_registry_session *registry; | |
7499 | ||
7500 | ua_sess = lookup_session_by_app(usess, app); | |
7501 | if (!ua_sess) { | |
7502 | /* Session not associated with this app. */ | |
7503 | continue; | |
7504 | } | |
7505 | ||
7506 | /* Get the right consumer socket for the application. */ | |
7507 | socket = consumer_find_socket_by_bitness( | |
7508 | app->bits_per_long, usess->consumer); | |
7509 | if (!socket) { | |
7510 | ret = LTTNG_ERR_FATAL; | |
7511 | goto error; | |
7512 | } | |
7513 | ||
7514 | registry = get_session_registry(ua_sess); | |
7515 | if (!registry) { | |
7516 | DBG("Application session is being torn down. Skip application."); | |
7517 | continue; | |
7518 | } | |
7519 | ||
7520 | cds_lfht_for_each_entry(ua_sess->channels->ht, | |
7521 | &chan_iter.iter, ua_chan, node.node) { | |
7522 | const int open_ret = | |
7523 | consumer_open_channel_packets( | |
7524 | socket, | |
7525 | ua_chan->key); | |
7526 | ||
7527 | if (open_ret < 0) { | |
7528 | /* | |
7529 | * Per-PID buffer and application going | |
7530 | * away. | |
7531 | */ | |
97a171e1 | 7532 | if (open_ret == -LTTNG_ERR_CHAN_NOT_FOUND) { |
04ed9e10 JG |
7533 | continue; |
7534 | } | |
7535 | ||
7536 | ret = LTTNG_ERR_UNK; | |
7537 | goto error; | |
7538 | } | |
7539 | } | |
7540 | } | |
7541 | break; | |
7542 | } | |
7543 | default: | |
7544 | abort(); | |
7545 | break; | |
7546 | } | |
7547 | ||
7548 | error: | |
7549 | rcu_read_unlock(); | |
7550 | return ret; | |
7551 | } |