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> | |
e393070a JR |
29 | #include <lttng/condition/on-event-internal.h> |
30 | #include <lttng/condition/on-event.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); | |
d602bd6a | 1256 | assert(lttng_condition_get_type(condition) == LTTNG_CONDITION_TYPE_ON_EVENT); |
267d66aa | 1257 | |
d602bd6a | 1258 | assert(LTTNG_CONDITION_STATUS_OK == lttng_condition_on_event_get_rule(condition, &event_rule)); |
267d66aa | 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; | |
fc4b93fa | 2003 | enum lttng_ust_abi_loglevel_type ust_loglevel_type = LTTNG_UST_ABI_LOGLEVEL_ALL; |
993578ff JR |
2004 | int loglevel = -1, ret = 0; |
2005 | const char *pattern; | |
2006 | ||
2007 | /* For now only LTTNG_EVENT_RULE_TYPE_TRACEPOINT are supported. */ | |
2008 | assert(lttng_event_rule_get_type(rule) == | |
2009 | LTTNG_EVENT_RULE_TYPE_TRACEPOINT); | |
2010 | ||
2011 | memset(event_notifier, 0, sizeof(*event_notifier)); | |
2012 | ||
44760c20 JR |
2013 | if (lttng_event_rule_targets_agent_domain(rule)) { |
2014 | /* | |
2015 | * Special event for agents | |
2016 | * The actual meat of the event is in the filter that will be | |
2017 | * attached later on. | |
2018 | * Set the default values for the agent event. | |
2019 | */ | |
2020 | pattern = event_get_default_agent_ust_name( | |
2021 | lttng_event_rule_get_domain_type(rule)); | |
2022 | loglevel = 0; | |
fc4b93fa | 2023 | ust_loglevel_type = LTTNG_UST_ABI_LOGLEVEL_ALL; |
44760c20 | 2024 | } else { |
85b05318 | 2025 | const struct lttng_log_level_rule *log_level_rule; |
993578ff | 2026 | |
85b05318 | 2027 | status = lttng_event_rule_tracepoint_get_pattern(rule, &pattern); |
44760c20 JR |
2028 | if (status != LTTNG_EVENT_RULE_STATUS_OK) { |
2029 | /* At this point, this is a fatal error. */ | |
2030 | abort(); | |
2031 | } | |
993578ff | 2032 | |
85b05318 JR |
2033 | status = lttng_event_rule_tracepoint_get_log_level_rule( |
2034 | rule, &log_level_rule); | |
2035 | if (status == LTTNG_EVENT_RULE_STATUS_UNSET) { | |
fc4b93fa | 2036 | ust_loglevel_type = LTTNG_UST_ABI_LOGLEVEL_ALL; |
85b05318 JR |
2037 | } else if (status == LTTNG_EVENT_RULE_STATUS_OK) { |
2038 | enum lttng_log_level_rule_status llr_status; | |
2039 | ||
2040 | switch (lttng_log_level_rule_get_type(log_level_rule)) { | |
2041 | case LTTNG_LOG_LEVEL_RULE_TYPE_EXACTLY: | |
2042 | ust_loglevel_type = LTTNG_UST_ABI_LOGLEVEL_SINGLE; | |
2043 | llr_status = lttng_log_level_rule_exactly_get_level( | |
2044 | log_level_rule, &loglevel); | |
2045 | break; | |
2046 | case LTTNG_LOG_LEVEL_RULE_TYPE_AT_LEAST_AS_SEVERE_AS: | |
2047 | ust_loglevel_type = LTTNG_UST_ABI_LOGLEVEL_RANGE; | |
2048 | llr_status = lttng_log_level_rule_at_least_as_severe_as_get_level( | |
2049 | log_level_rule, &loglevel); | |
2050 | break; | |
2051 | default: | |
2052 | abort(); | |
2053 | } | |
993578ff | 2054 | |
85b05318 JR |
2055 | assert(llr_status == LTTNG_LOG_LEVEL_RULE_STATUS_OK); |
2056 | } else { | |
2057 | /* At this point this is a fatal error. */ | |
2058 | abort(); | |
44760c20 | 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); | |
d602bd6a | 2098 | assert(lttng_condition_get_type(condition) == LTTNG_CONDITION_TYPE_ON_EVENT); |
993578ff | 2099 | |
d602bd6a JR |
2100 | condition_status = lttng_condition_on_event_get_rule( |
2101 | condition, &event_rule); | |
267d66aa | 2102 | assert(condition_status == LTTNG_CONDITION_STATUS_OK); |
d602bd6a | 2103 | |
267d66aa JR |
2104 | assert(event_rule); |
2105 | assert(lttng_event_rule_get_type(event_rule) == LTTNG_EVENT_RULE_TYPE_TRACEPOINT); | |
2106 | ||
2107 | init_ust_event_notifier_from_event_rule(event_rule, &event_notifier); | |
993578ff JR |
2108 | event_notifier.event.token = ua_event_notifier_rule->token; |
2109 | ||
2110 | /* Create UST event notifier against the tracer. */ | |
2111 | pthread_mutex_lock(&app->sock_lock); | |
2112 | ret = ustctl_create_event_notifier(app->sock, &event_notifier, | |
2113 | app->event_notifier_group.object, | |
2114 | &ua_event_notifier_rule->obj); | |
2115 | pthread_mutex_unlock(&app->sock_lock); | |
2116 | if (ret < 0) { | |
2117 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
2118 | ERR("Error ustctl create event notifier: name = '%s', app = '%s' (ppid: %d), ret = %d", | |
2119 | event_notifier.event.name, app->name, | |
2120 | app->ppid, ret); | |
2121 | } else { | |
2122 | /* | |
2123 | * This is normal behavior, an application can die | |
2124 | * during the creation process. Don't report an error so | |
2125 | * the execution can continue normally. | |
2126 | */ | |
2127 | ret = 0; | |
2128 | DBG3("UST app create event notifier failed (application is dead): app = '%s' (ppid = %d)", | |
2129 | app->name, app->ppid); | |
2130 | } | |
2131 | ||
2132 | goto error; | |
2133 | } | |
2134 | ||
2135 | ua_event_notifier_rule->handle = ua_event_notifier_rule->obj->handle; | |
2136 | ||
2137 | DBG2("UST app event notifier %s created successfully: app = '%s' (ppid: %d), object: %p", | |
2138 | event_notifier.event.name, app->name, app->ppid, | |
2139 | ua_event_notifier_rule->obj); | |
2140 | ||
2141 | health_code_update(); | |
2142 | ||
2143 | /* Set filter if one is present. */ | |
2144 | if (ua_event_notifier_rule->filter) { | |
2145 | ret = set_ust_object_filter(app, ua_event_notifier_rule->filter, | |
2146 | ua_event_notifier_rule->obj); | |
2147 | if (ret < 0) { | |
2148 | goto error; | |
2149 | } | |
2150 | } | |
2151 | ||
2152 | /* Set exclusions for the event. */ | |
2153 | if (ua_event_notifier_rule->exclusion) { | |
2154 | ret = set_ust_object_exclusions(app, | |
2155 | ua_event_notifier_rule->exclusion, | |
2156 | ua_event_notifier_rule->obj); | |
2157 | if (ret < 0) { | |
2158 | goto error; | |
2159 | } | |
2160 | } | |
f83be61d JR |
2161 | |
2162 | /* Set the capture bytecodes. */ | |
d602bd6a | 2163 | cond_status = lttng_condition_on_event_get_capture_descriptor_count( |
f83be61d JR |
2164 | condition, &capture_bytecode_count); |
2165 | assert(cond_status == LTTNG_CONDITION_STATUS_OK); | |
2166 | ||
2167 | for (i = 0; i < capture_bytecode_count; i++) { | |
2168 | const struct lttng_bytecode *capture_bytecode = | |
d602bd6a | 2169 | lttng_condition_on_event_get_capture_bytecode_at_index( |
f83be61d JR |
2170 | condition, i); |
2171 | ||
11f6ce94 | 2172 | ret = set_ust_capture(app, capture_bytecode, i, |
f83be61d JR |
2173 | ua_event_notifier_rule->obj); |
2174 | if (ret < 0) { | |
2175 | goto error; | |
2176 | } | |
2177 | } | |
993578ff JR |
2178 | |
2179 | /* | |
2180 | * We now need to explicitly enable the event, since it | |
2181 | * is disabled at creation. | |
2182 | */ | |
2183 | ret = enable_ust_object(app, ua_event_notifier_rule->obj); | |
2184 | if (ret < 0) { | |
2185 | /* | |
2186 | * If we hit an EPERM, something is wrong with our enable call. | |
2187 | * If we get an EEXIST, there is a problem on the tracer side | |
2188 | * since we just created it. | |
2189 | */ | |
2190 | switch (ret) { | |
2191 | case -LTTNG_UST_ERR_PERM: | |
2192 | /* Code flow problem. */ | |
2193 | abort(); | |
2194 | case -LTTNG_UST_ERR_EXIST: | |
2195 | /* It's OK for our use case. */ | |
2196 | ret = 0; | |
2197 | break; | |
2198 | default: | |
2199 | break; | |
2200 | } | |
2201 | ||
2202 | goto error; | |
2203 | } | |
2204 | ||
2205 | ua_event_notifier_rule->enabled = true; | |
2206 | ||
2207 | error: | |
2208 | health_code_update(); | |
2209 | return ret; | |
2210 | } | |
2211 | ||
5b4a0ec0 DG |
2212 | /* |
2213 | * Copy data between an UST app event and a LTT event. | |
2214 | */ | |
421cb601 | 2215 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
2216 | struct ltt_ust_event *uevent) |
2217 | { | |
b4ffad32 JI |
2218 | size_t exclusion_alloc_size; |
2219 | ||
48842b30 DG |
2220 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); |
2221 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
2222 | ||
fc34caaa DG |
2223 | ua_event->enabled = uevent->enabled; |
2224 | ||
5b4a0ec0 DG |
2225 | /* Copy event attributes */ |
2226 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
2227 | ||
53a80697 MD |
2228 | /* Copy filter bytecode */ |
2229 | if (uevent->filter) { | |
2b00d462 | 2230 | ua_event->filter = lttng_bytecode_copy(uevent->filter); |
025faf73 | 2231 | /* Filter might be NULL here in case of ENONEM. */ |
53a80697 | 2232 | } |
b4ffad32 JI |
2233 | |
2234 | /* Copy exclusion data */ | |
2235 | if (uevent->exclusion) { | |
51755dc8 | 2236 | exclusion_alloc_size = sizeof(struct lttng_event_exclusion) + |
fc4b93fa | 2237 | LTTNG_UST_ABI_SYM_NAME_LEN * uevent->exclusion->count; |
b4ffad32 | 2238 | ua_event->exclusion = zmalloc(exclusion_alloc_size); |
5f8df26c JI |
2239 | if (ua_event->exclusion == NULL) { |
2240 | PERROR("malloc"); | |
2241 | } else { | |
2242 | memcpy(ua_event->exclusion, uevent->exclusion, | |
2243 | exclusion_alloc_size); | |
b4ffad32 JI |
2244 | } |
2245 | } | |
48842b30 DG |
2246 | } |
2247 | ||
5b4a0ec0 DG |
2248 | /* |
2249 | * Copy data between an UST app channel and a LTT channel. | |
2250 | */ | |
421cb601 | 2251 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
2252 | struct ltt_ust_channel *uchan) |
2253 | { | |
fc34caaa | 2254 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
2255 | |
2256 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
2257 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 2258 | |
1624d5b7 JD |
2259 | ua_chan->tracefile_size = uchan->tracefile_size; |
2260 | ua_chan->tracefile_count = uchan->tracefile_count; | |
2261 | ||
ffe60014 DG |
2262 | /* Copy event attributes since the layout is different. */ |
2263 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
2264 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
2265 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
2266 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
2267 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
e9404c27 | 2268 | ua_chan->monitor_timer_interval = uchan->monitor_timer_interval; |
ffe60014 | 2269 | ua_chan->attr.output = uchan->attr.output; |
491d1539 MD |
2270 | ua_chan->attr.blocking_timeout = uchan->attr.u.s.blocking_timeout; |
2271 | ||
ffe60014 DG |
2272 | /* |
2273 | * Note that the attribute channel type is not set since the channel on the | |
2274 | * tracing registry side does not have this information. | |
2275 | */ | |
48842b30 | 2276 | |
fc34caaa | 2277 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 2278 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 2279 | |
fc34caaa | 2280 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
2281 | } |
2282 | ||
5b4a0ec0 DG |
2283 | /* |
2284 | * Copy data between a UST app session and a regular LTT session. | |
2285 | */ | |
421cb601 | 2286 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 2287 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 2288 | { |
477d7741 MD |
2289 | struct tm *timeinfo; |
2290 | char datetime[16]; | |
2291 | int ret; | |
d7ba1388 | 2292 | char tmp_shm_path[PATH_MAX]; |
477d7741 | 2293 | |
940c4592 | 2294 | timeinfo = localtime(&app->registration_time); |
477d7741 | 2295 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); |
48842b30 | 2296 | |
421cb601 | 2297 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 2298 | |
7972aab2 DG |
2299 | ua_sess->tracing_id = usess->id; |
2300 | ua_sess->id = get_next_session_id(); | |
ff588497 JR |
2301 | LTTNG_OPTIONAL_SET(&ua_sess->real_credentials.uid, app->uid); |
2302 | LTTNG_OPTIONAL_SET(&ua_sess->real_credentials.gid, app->gid); | |
2303 | LTTNG_OPTIONAL_SET(&ua_sess->effective_credentials.uid, usess->uid); | |
2304 | LTTNG_OPTIONAL_SET(&ua_sess->effective_credentials.gid, usess->gid); | |
7972aab2 DG |
2305 | ua_sess->buffer_type = usess->buffer_type; |
2306 | ua_sess->bits_per_long = app->bits_per_long; | |
6addfa37 | 2307 | |
7972aab2 | 2308 | /* There is only one consumer object per session possible. */ |
6addfa37 | 2309 | consumer_output_get(usess->consumer); |
7972aab2 | 2310 | ua_sess->consumer = usess->consumer; |
6addfa37 | 2311 | |
2bba9e53 | 2312 | ua_sess->output_traces = usess->output_traces; |
ecc48a90 | 2313 | ua_sess->live_timer_interval = usess->live_timer_interval; |
84ad93e8 DG |
2314 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, |
2315 | &usess->metadata_attr); | |
7972aab2 DG |
2316 | |
2317 | switch (ua_sess->buffer_type) { | |
2318 | case LTTNG_BUFFER_PER_PID: | |
2319 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 2320 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
2321 | datetime); |
2322 | break; | |
2323 | case LTTNG_BUFFER_PER_UID: | |
2324 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
470cc211 | 2325 | DEFAULT_UST_TRACE_UID_PATH, |
ff588497 | 2326 | lttng_credentials_get_uid(&ua_sess->real_credentials), |
470cc211 | 2327 | app->bits_per_long); |
7972aab2 DG |
2328 | break; |
2329 | default: | |
2330 | assert(0); | |
2331 | goto error; | |
2332 | } | |
477d7741 MD |
2333 | if (ret < 0) { |
2334 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 2335 | assert(0); |
7972aab2 | 2336 | goto error; |
477d7741 MD |
2337 | } |
2338 | ||
3d071855 MD |
2339 | strncpy(ua_sess->root_shm_path, usess->root_shm_path, |
2340 | sizeof(ua_sess->root_shm_path)); | |
2341 | ua_sess->root_shm_path[sizeof(ua_sess->root_shm_path) - 1] = '\0'; | |
d7ba1388 MD |
2342 | strncpy(ua_sess->shm_path, usess->shm_path, |
2343 | sizeof(ua_sess->shm_path)); | |
2344 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
2345 | if (ua_sess->shm_path[0]) { | |
2346 | switch (ua_sess->buffer_type) { | |
2347 | case LTTNG_BUFFER_PER_PID: | |
2348 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
5da88b0f | 2349 | "/" DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", |
d7ba1388 MD |
2350 | app->name, app->pid, datetime); |
2351 | break; | |
2352 | case LTTNG_BUFFER_PER_UID: | |
2353 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
5da88b0f | 2354 | "/" DEFAULT_UST_TRACE_UID_PATH, |
d7ba1388 MD |
2355 | app->uid, app->bits_per_long); |
2356 | break; | |
2357 | default: | |
2358 | assert(0); | |
2359 | goto error; | |
2360 | } | |
2361 | if (ret < 0) { | |
2362 | PERROR("sprintf UST shadow copy session"); | |
2363 | assert(0); | |
2364 | goto error; | |
2365 | } | |
2366 | strncat(ua_sess->shm_path, tmp_shm_path, | |
2367 | sizeof(ua_sess->shm_path) - strlen(ua_sess->shm_path) - 1); | |
2368 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
2369 | } | |
6addfa37 | 2370 | return; |
7972aab2 DG |
2371 | |
2372 | error: | |
6addfa37 | 2373 | consumer_output_put(ua_sess->consumer); |
48842b30 DG |
2374 | } |
2375 | ||
78f0bacd DG |
2376 | /* |
2377 | * Lookup sesison wrapper. | |
2378 | */ | |
84cd17c6 | 2379 | static |
fb9a95c4 | 2380 | void __lookup_session_by_app(const struct ltt_ust_session *usess, |
bec39940 | 2381 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
2382 | { |
2383 | /* Get right UST app session from app */ | |
d9bf3ca4 | 2384 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
2385 | } |
2386 | ||
421cb601 DG |
2387 | /* |
2388 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 2389 | * id. |
421cb601 | 2390 | */ |
48842b30 | 2391 | static struct ust_app_session *lookup_session_by_app( |
fb9a95c4 | 2392 | const struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 2393 | { |
bec39940 | 2394 | struct lttng_ht_iter iter; |
d9bf3ca4 | 2395 | struct lttng_ht_node_u64 *node; |
48842b30 | 2396 | |
84cd17c6 | 2397 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 2398 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
2399 | if (node == NULL) { |
2400 | goto error; | |
2401 | } | |
2402 | ||
2403 | return caa_container_of(node, struct ust_app_session, node); | |
2404 | ||
2405 | error: | |
2406 | return NULL; | |
2407 | } | |
2408 | ||
7972aab2 DG |
2409 | /* |
2410 | * Setup buffer registry per PID for the given session and application. If none | |
2411 | * is found, a new one is created, added to the global registry and | |
2412 | * initialized. If regp is valid, it's set with the newly created object. | |
2413 | * | |
2414 | * Return 0 on success or else a negative value. | |
2415 | */ | |
2416 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
2417 | struct ust_app *app, struct buffer_reg_pid **regp) | |
2418 | { | |
2419 | int ret = 0; | |
2420 | struct buffer_reg_pid *reg_pid; | |
2421 | ||
2422 | assert(ua_sess); | |
2423 | assert(app); | |
2424 | ||
2425 | rcu_read_lock(); | |
2426 | ||
2427 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
2428 | if (!reg_pid) { | |
2429 | /* | |
2430 | * This is the create channel path meaning that if there is NO | |
2431 | * registry available, we have to create one for this session. | |
2432 | */ | |
d7ba1388 | 2433 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid, |
3d071855 | 2434 | ua_sess->root_shm_path, ua_sess->shm_path); |
7972aab2 DG |
2435 | if (ret < 0) { |
2436 | goto error; | |
2437 | } | |
7972aab2 DG |
2438 | } else { |
2439 | goto end; | |
2440 | } | |
2441 | ||
2442 | /* Initialize registry. */ | |
2443 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
2444 | app->bits_per_long, app->uint8_t_alignment, | |
2445 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf | 2446 | app->uint64_t_alignment, app->long_alignment, |
470cc211 JG |
2447 | app->byte_order, app->version.major, app->version.minor, |
2448 | reg_pid->root_shm_path, reg_pid->shm_path, | |
ff588497 JR |
2449 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
2450 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
2451 | ua_sess->tracing_id, | |
8de88061 | 2452 | app->uid); |
7972aab2 | 2453 | if (ret < 0) { |
286c991a MD |
2454 | /* |
2455 | * reg_pid->registry->reg.ust is NULL upon error, so we need to | |
2456 | * destroy the buffer registry, because it is always expected | |
2457 | * that if the buffer registry can be found, its ust registry is | |
2458 | * non-NULL. | |
2459 | */ | |
2460 | buffer_reg_pid_destroy(reg_pid); | |
7972aab2 DG |
2461 | goto error; |
2462 | } | |
2463 | ||
286c991a MD |
2464 | buffer_reg_pid_add(reg_pid); |
2465 | ||
7972aab2 DG |
2466 | DBG3("UST app buffer registry per PID created successfully"); |
2467 | ||
2468 | end: | |
2469 | if (regp) { | |
2470 | *regp = reg_pid; | |
2471 | } | |
2472 | error: | |
2473 | rcu_read_unlock(); | |
2474 | return ret; | |
2475 | } | |
2476 | ||
2477 | /* | |
2478 | * Setup buffer registry per UID for the given session and application. If none | |
2479 | * is found, a new one is created, added to the global registry and | |
2480 | * initialized. If regp is valid, it's set with the newly created object. | |
2481 | * | |
2482 | * Return 0 on success or else a negative value. | |
2483 | */ | |
2484 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
d7ba1388 | 2485 | struct ust_app_session *ua_sess, |
7972aab2 DG |
2486 | struct ust_app *app, struct buffer_reg_uid **regp) |
2487 | { | |
2488 | int ret = 0; | |
2489 | struct buffer_reg_uid *reg_uid; | |
2490 | ||
2491 | assert(usess); | |
2492 | assert(app); | |
2493 | ||
2494 | rcu_read_lock(); | |
2495 | ||
2496 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2497 | if (!reg_uid) { | |
2498 | /* | |
2499 | * This is the create channel path meaning that if there is NO | |
2500 | * registry available, we have to create one for this session. | |
2501 | */ | |
2502 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
3d071855 MD |
2503 | LTTNG_DOMAIN_UST, ®_uid, |
2504 | ua_sess->root_shm_path, ua_sess->shm_path); | |
7972aab2 DG |
2505 | if (ret < 0) { |
2506 | goto error; | |
2507 | } | |
7972aab2 DG |
2508 | } else { |
2509 | goto end; | |
2510 | } | |
2511 | ||
2512 | /* Initialize registry. */ | |
af6142cf | 2513 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
2514 | app->bits_per_long, app->uint8_t_alignment, |
2515 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
2516 | app->uint64_t_alignment, app->long_alignment, |
2517 | app->byte_order, app->version.major, | |
3d071855 | 2518 | app->version.minor, reg_uid->root_shm_path, |
8de88061 JR |
2519 | reg_uid->shm_path, usess->uid, usess->gid, |
2520 | ua_sess->tracing_id, app->uid); | |
7972aab2 | 2521 | if (ret < 0) { |
286c991a MD |
2522 | /* |
2523 | * reg_uid->registry->reg.ust is NULL upon error, so we need to | |
2524 | * destroy the buffer registry, because it is always expected | |
2525 | * that if the buffer registry can be found, its ust registry is | |
2526 | * non-NULL. | |
2527 | */ | |
2528 | buffer_reg_uid_destroy(reg_uid, NULL); | |
7972aab2 DG |
2529 | goto error; |
2530 | } | |
2531 | /* Add node to teardown list of the session. */ | |
2532 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
2533 | ||
286c991a | 2534 | buffer_reg_uid_add(reg_uid); |
7972aab2 | 2535 | |
286c991a | 2536 | DBG3("UST app buffer registry per UID created successfully"); |
7972aab2 DG |
2537 | end: |
2538 | if (regp) { | |
2539 | *regp = reg_uid; | |
2540 | } | |
2541 | error: | |
2542 | rcu_read_unlock(); | |
2543 | return ret; | |
2544 | } | |
2545 | ||
421cb601 | 2546 | /* |
3d8ca23b | 2547 | * Create a session on the tracer side for the given app. |
421cb601 | 2548 | * |
3d8ca23b DG |
2549 | * On success, ua_sess_ptr is populated with the session pointer or else left |
2550 | * untouched. If the session was created, is_created is set to 1. On error, | |
2551 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
2552 | * be NULL. | |
2553 | * | |
2554 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
2555 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 2556 | */ |
03f91eaa | 2557 | static int find_or_create_ust_app_session(struct ltt_ust_session *usess, |
3d8ca23b DG |
2558 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, |
2559 | int *is_created) | |
421cb601 | 2560 | { |
3d8ca23b | 2561 | int ret, created = 0; |
421cb601 DG |
2562 | struct ust_app_session *ua_sess; |
2563 | ||
3d8ca23b DG |
2564 | assert(usess); |
2565 | assert(app); | |
2566 | assert(ua_sess_ptr); | |
2567 | ||
840cb59c | 2568 | health_code_update(); |
86acf0da | 2569 | |
421cb601 DG |
2570 | ua_sess = lookup_session_by_app(usess, app); |
2571 | if (ua_sess == NULL) { | |
d9bf3ca4 | 2572 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 2573 | app->pid, usess->id); |
40bbd087 | 2574 | ua_sess = alloc_ust_app_session(); |
421cb601 DG |
2575 | if (ua_sess == NULL) { |
2576 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
2577 | ret = -ENOMEM; |
2578 | goto error; | |
421cb601 | 2579 | } |
477d7741 | 2580 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 2581 | created = 1; |
421cb601 DG |
2582 | } |
2583 | ||
7972aab2 DG |
2584 | switch (usess->buffer_type) { |
2585 | case LTTNG_BUFFER_PER_PID: | |
2586 | /* Init local registry. */ | |
2587 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 2588 | if (ret < 0) { |
e64207cf | 2589 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2590 | goto error; |
2591 | } | |
2592 | break; | |
2593 | case LTTNG_BUFFER_PER_UID: | |
2594 | /* Look for a global registry. If none exists, create one. */ | |
d7ba1388 | 2595 | ret = setup_buffer_reg_uid(usess, ua_sess, app, NULL); |
7972aab2 | 2596 | if (ret < 0) { |
e64207cf | 2597 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2598 | goto error; |
2599 | } | |
2600 | break; | |
2601 | default: | |
2602 | assert(0); | |
2603 | ret = -EINVAL; | |
2604 | goto error; | |
2605 | } | |
2606 | ||
2607 | health_code_update(); | |
2608 | ||
2609 | if (ua_sess->handle == -1) { | |
fb45065e | 2610 | pthread_mutex_lock(&app->sock_lock); |
7972aab2 | 2611 | ret = ustctl_create_session(app->sock); |
fb45065e | 2612 | pthread_mutex_unlock(&app->sock_lock); |
7972aab2 DG |
2613 | if (ret < 0) { |
2614 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
2615 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
2616 | app->pid, ret); |
2617 | } else { | |
2618 | DBG("UST app creating session failed. Application is dead"); | |
3757b385 DG |
2619 | /* |
2620 | * This is normal behavior, an application can die during the | |
2621 | * creation process. Don't report an error so the execution can | |
2622 | * continue normally. This will get flagged ENOTCONN and the | |
2623 | * caller will handle it. | |
2624 | */ | |
2625 | ret = 0; | |
ffe60014 | 2626 | } |
d0b96690 | 2627 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
2628 | if (ret != -ENOMEM) { |
2629 | /* | |
2630 | * Tracer is probably gone or got an internal error so let's | |
2631 | * behave like it will soon unregister or not usable. | |
2632 | */ | |
2633 | ret = -ENOTCONN; | |
2634 | } | |
2635 | goto error; | |
421cb601 DG |
2636 | } |
2637 | ||
7972aab2 DG |
2638 | ua_sess->handle = ret; |
2639 | ||
2640 | /* Add ust app session to app's HT */ | |
d9bf3ca4 MD |
2641 | lttng_ht_node_init_u64(&ua_sess->node, |
2642 | ua_sess->tracing_id); | |
2643 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
10b56aef MD |
2644 | lttng_ht_node_init_ulong(&ua_sess->ust_objd_node, ua_sess->handle); |
2645 | lttng_ht_add_unique_ulong(app->ust_sessions_objd, | |
2646 | &ua_sess->ust_objd_node); | |
7972aab2 DG |
2647 | |
2648 | DBG2("UST app session created successfully with handle %d", ret); | |
2649 | } | |
2650 | ||
2651 | *ua_sess_ptr = ua_sess; | |
2652 | if (is_created) { | |
2653 | *is_created = created; | |
2654 | } | |
2655 | ||
2656 | /* Everything went well. */ | |
2657 | ret = 0; | |
2658 | ||
2659 | error: | |
2660 | health_code_update(); | |
2661 | return ret; | |
2662 | } | |
2663 | ||
6a6b2068 JG |
2664 | /* |
2665 | * Match function for a hash table lookup of ust_app_ctx. | |
2666 | * | |
2667 | * It matches an ust app context based on the context type and, in the case | |
2668 | * of perf counters, their name. | |
2669 | */ | |
2670 | static int ht_match_ust_app_ctx(struct cds_lfht_node *node, const void *_key) | |
2671 | { | |
2672 | struct ust_app_ctx *ctx; | |
bdf64013 | 2673 | const struct lttng_ust_context_attr *key; |
6a6b2068 JG |
2674 | |
2675 | assert(node); | |
2676 | assert(_key); | |
2677 | ||
2678 | ctx = caa_container_of(node, struct ust_app_ctx, node.node); | |
2679 | key = _key; | |
2680 | ||
2681 | /* Context type */ | |
2682 | if (ctx->ctx.ctx != key->ctx) { | |
2683 | goto no_match; | |
2684 | } | |
2685 | ||
bdf64013 | 2686 | switch(key->ctx) { |
fc4b93fa | 2687 | case LTTNG_UST_ABI_CONTEXT_PERF_THREAD_COUNTER: |
6a6b2068 | 2688 | if (strncmp(key->u.perf_counter.name, |
bdf64013 JG |
2689 | ctx->ctx.u.perf_counter.name, |
2690 | sizeof(key->u.perf_counter.name))) { | |
2691 | goto no_match; | |
2692 | } | |
2693 | break; | |
fc4b93fa | 2694 | case LTTNG_UST_ABI_CONTEXT_APP_CONTEXT: |
bdf64013 JG |
2695 | if (strcmp(key->u.app_ctx.provider_name, |
2696 | ctx->ctx.u.app_ctx.provider_name) || | |
2697 | strcmp(key->u.app_ctx.ctx_name, | |
2698 | ctx->ctx.u.app_ctx.ctx_name)) { | |
6a6b2068 JG |
2699 | goto no_match; |
2700 | } | |
bdf64013 JG |
2701 | break; |
2702 | default: | |
2703 | break; | |
6a6b2068 JG |
2704 | } |
2705 | ||
2706 | /* Match. */ | |
2707 | return 1; | |
2708 | ||
2709 | no_match: | |
2710 | return 0; | |
2711 | } | |
2712 | ||
2713 | /* | |
2714 | * Lookup for an ust app context from an lttng_ust_context. | |
2715 | * | |
be184a0f | 2716 | * Must be called while holding RCU read side lock. |
6a6b2068 JG |
2717 | * Return an ust_app_ctx object or NULL on error. |
2718 | */ | |
2719 | static | |
2720 | struct ust_app_ctx *find_ust_app_context(struct lttng_ht *ht, | |
bdf64013 | 2721 | struct lttng_ust_context_attr *uctx) |
6a6b2068 JG |
2722 | { |
2723 | struct lttng_ht_iter iter; | |
2724 | struct lttng_ht_node_ulong *node; | |
2725 | struct ust_app_ctx *app_ctx = NULL; | |
2726 | ||
2727 | assert(uctx); | |
2728 | assert(ht); | |
2729 | ||
2730 | /* Lookup using the lttng_ust_context_type and a custom match fct. */ | |
2731 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) uctx->ctx, lttng_ht_seed), | |
2732 | ht_match_ust_app_ctx, uctx, &iter.iter); | |
2733 | node = lttng_ht_iter_get_node_ulong(&iter); | |
2734 | if (!node) { | |
2735 | goto end; | |
2736 | } | |
2737 | ||
2738 | app_ctx = caa_container_of(node, struct ust_app_ctx, node); | |
2739 | ||
2740 | end: | |
2741 | return app_ctx; | |
2742 | } | |
2743 | ||
7972aab2 DG |
2744 | /* |
2745 | * Create a context for the channel on the tracer. | |
2746 | * | |
2747 | * Called with UST app session lock held and a RCU read side lock. | |
2748 | */ | |
2749 | static | |
c9edf082 | 2750 | int create_ust_app_channel_context(struct ust_app_channel *ua_chan, |
f3db82be | 2751 | struct lttng_ust_context_attr *uctx, |
7972aab2 DG |
2752 | struct ust_app *app) |
2753 | { | |
2754 | int ret = 0; | |
7972aab2 DG |
2755 | struct ust_app_ctx *ua_ctx; |
2756 | ||
2757 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
2758 | ||
6a6b2068 JG |
2759 | ua_ctx = find_ust_app_context(ua_chan->ctx, uctx); |
2760 | if (ua_ctx) { | |
7972aab2 DG |
2761 | ret = -EEXIST; |
2762 | goto error; | |
2763 | } | |
2764 | ||
2765 | ua_ctx = alloc_ust_app_ctx(uctx); | |
2766 | if (ua_ctx == NULL) { | |
2767 | /* malloc failed */ | |
7682f304 | 2768 | ret = -ENOMEM; |
7972aab2 DG |
2769 | goto error; |
2770 | } | |
2771 | ||
2772 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 2773 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 2774 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
2775 | |
2776 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
2777 | if (ret < 0) { | |
2778 | goto error; | |
2779 | } | |
2780 | ||
2781 | error: | |
2782 | return ret; | |
2783 | } | |
2784 | ||
2785 | /* | |
2786 | * Enable on the tracer side a ust app event for the session and channel. | |
2787 | * | |
2788 | * Called with UST app session lock held. | |
2789 | */ | |
2790 | static | |
2791 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
2792 | struct ust_app_event *ua_event, struct ust_app *app) | |
2793 | { | |
2794 | int ret; | |
2795 | ||
3428a1b7 | 2796 | ret = enable_ust_object(app, ua_event->obj); |
7972aab2 DG |
2797 | if (ret < 0) { |
2798 | goto error; | |
2799 | } | |
2800 | ||
2801 | ua_event->enabled = 1; | |
2802 | ||
2803 | error: | |
2804 | return ret; | |
2805 | } | |
2806 | ||
2807 | /* | |
2808 | * Disable on the tracer side a ust app event for the session and channel. | |
2809 | */ | |
2810 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
2811 | struct ust_app_event *ua_event, struct ust_app *app) | |
2812 | { | |
2813 | int ret; | |
2814 | ||
e2456d0a | 2815 | ret = disable_ust_object(app, ua_event->obj); |
7972aab2 DG |
2816 | if (ret < 0) { |
2817 | goto error; | |
2818 | } | |
2819 | ||
2820 | ua_event->enabled = 0; | |
2821 | ||
2822 | error: | |
2823 | return ret; | |
2824 | } | |
2825 | ||
2826 | /* | |
2827 | * Lookup ust app channel for session and disable it on the tracer side. | |
2828 | */ | |
2829 | static | |
2830 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
2831 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
2832 | { | |
2833 | int ret; | |
2834 | ||
2835 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2836 | if (ret < 0) { | |
2837 | goto error; | |
2838 | } | |
2839 | ||
2840 | ua_chan->enabled = 0; | |
2841 | ||
2842 | error: | |
2843 | return ret; | |
2844 | } | |
2845 | ||
2846 | /* | |
2847 | * Lookup ust app channel for session and enable it on the tracer side. This | |
2848 | * MUST be called with a RCU read side lock acquired. | |
2849 | */ | |
2850 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
2851 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
2852 | { | |
2853 | int ret = 0; | |
2854 | struct lttng_ht_iter iter; | |
2855 | struct lttng_ht_node_str *ua_chan_node; | |
2856 | struct ust_app_channel *ua_chan; | |
2857 | ||
2858 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
2859 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
2860 | if (ua_chan_node == NULL) { | |
d9bf3ca4 | 2861 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
2862 | uchan->name, ua_sess->tracing_id); |
2863 | goto error; | |
2864 | } | |
2865 | ||
2866 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2867 | ||
2868 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
2869 | if (ret < 0) { | |
2870 | goto error; | |
2871 | } | |
2872 | ||
2873 | error: | |
2874 | return ret; | |
2875 | } | |
2876 | ||
2877 | /* | |
2878 | * Ask the consumer to create a channel and get it if successful. | |
2879 | * | |
fad1ed2f JR |
2880 | * Called with UST app session lock held. |
2881 | * | |
7972aab2 DG |
2882 | * Return 0 on success or else a negative value. |
2883 | */ | |
2884 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
2885 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
e098433c JG |
2886 | int bitness, struct ust_registry_session *registry, |
2887 | uint64_t trace_archive_id) | |
7972aab2 DG |
2888 | { |
2889 | int ret; | |
2890 | unsigned int nb_fd = 0; | |
2891 | struct consumer_socket *socket; | |
2892 | ||
2893 | assert(usess); | |
2894 | assert(ua_sess); | |
2895 | assert(ua_chan); | |
2896 | assert(registry); | |
2897 | ||
2898 | rcu_read_lock(); | |
2899 | health_code_update(); | |
2900 | ||
2901 | /* Get the right consumer socket for the application. */ | |
2902 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
2903 | if (!socket) { | |
2904 | ret = -EINVAL; | |
2905 | goto error; | |
2906 | } | |
2907 | ||
2908 | health_code_update(); | |
2909 | ||
2910 | /* Need one fd for the channel. */ | |
2911 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2912 | if (ret < 0) { | |
2913 | ERR("Exhausted number of available FD upon create channel"); | |
2914 | goto error; | |
2915 | } | |
2916 | ||
2917 | /* | |
2918 | * Ask consumer to create channel. The consumer will return the number of | |
2919 | * stream we have to expect. | |
2920 | */ | |
2921 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
d2956687 | 2922 | registry, usess->current_trace_chunk); |
7972aab2 DG |
2923 | if (ret < 0) { |
2924 | goto error_ask; | |
2925 | } | |
2926 | ||
2927 | /* | |
2928 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2929 | * stream (2 being the default value here). | |
2930 | */ | |
2931 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2932 | ||
2933 | /* Reserve the amount of file descriptor we need. */ | |
2934 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2935 | if (ret < 0) { | |
2936 | ERR("Exhausted number of available FD upon create channel"); | |
2937 | goto error_fd_get_stream; | |
2938 | } | |
2939 | ||
2940 | health_code_update(); | |
2941 | ||
2942 | /* | |
2943 | * Now get the channel from the consumer. This call wil populate the stream | |
2944 | * list of that channel and set the ust objects. | |
2945 | */ | |
d9078d0c DG |
2946 | if (usess->consumer->enabled) { |
2947 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2948 | if (ret < 0) { | |
2949 | goto error_destroy; | |
2950 | } | |
7972aab2 DG |
2951 | } |
2952 | ||
2953 | rcu_read_unlock(); | |
2954 | return 0; | |
2955 | ||
2956 | error_destroy: | |
2957 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2958 | error_fd_get_stream: | |
2959 | /* | |
2960 | * Initiate a destroy channel on the consumer since we had an error | |
2961 | * handling it on our side. The return value is of no importance since we | |
2962 | * already have a ret value set by the previous error that we need to | |
2963 | * return. | |
2964 | */ | |
2965 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2966 | error_ask: | |
2967 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2968 | error: | |
2969 | health_code_update(); | |
2970 | rcu_read_unlock(); | |
2971 | return ret; | |
2972 | } | |
2973 | ||
2974 | /* | |
2975 | * Duplicate the ust data object of the ust app stream and save it in the | |
2976 | * buffer registry stream. | |
2977 | * | |
2978 | * Return 0 on success or else a negative value. | |
2979 | */ | |
2980 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2981 | struct ust_app_stream *stream) | |
2982 | { | |
2983 | int ret; | |
2984 | ||
2985 | assert(reg_stream); | |
2986 | assert(stream); | |
2987 | ||
2988 | /* Reserve the amount of file descriptor we need. */ | |
2989 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2990 | if (ret < 0) { | |
2991 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2992 | goto error; | |
2993 | } | |
2994 | ||
2995 | /* Duplicate object for stream once the original is in the registry. */ | |
2996 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2997 | reg_stream->obj.ust); | |
2998 | if (ret < 0) { | |
2999 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
3000 | reg_stream->obj.ust, stream->obj, ret); | |
3001 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
3002 | goto error; | |
3003 | } | |
3004 | stream->handle = stream->obj->handle; | |
3005 | ||
3006 | error: | |
3007 | return ret; | |
3008 | } | |
3009 | ||
3010 | /* | |
3011 | * Duplicate the ust data object of the ust app. channel and save it in the | |
3012 | * buffer registry channel. | |
3013 | * | |
3014 | * Return 0 on success or else a negative value. | |
3015 | */ | |
3016 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
3017 | struct ust_app_channel *ua_chan) | |
3018 | { | |
3019 | int ret; | |
3020 | ||
3021 | assert(reg_chan); | |
3022 | assert(ua_chan); | |
3023 | ||
3024 | /* Need two fds for the channel. */ | |
3025 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
3026 | if (ret < 0) { | |
3027 | ERR("Exhausted number of available FD upon duplicate channel"); | |
3028 | goto error_fd_get; | |
3029 | } | |
3030 | ||
3031 | /* Duplicate object for stream once the original is in the registry. */ | |
3032 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
3033 | if (ret < 0) { | |
3034 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
3035 | reg_chan->obj.ust, ua_chan->obj, ret); | |
3036 | goto error; | |
3037 | } | |
3038 | ua_chan->handle = ua_chan->obj->handle; | |
3039 | ||
3040 | return 0; | |
3041 | ||
3042 | error: | |
3043 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
3044 | error_fd_get: | |
3045 | return ret; | |
3046 | } | |
3047 | ||
3048 | /* | |
3049 | * For a given channel buffer registry, setup all streams of the given ust | |
3050 | * application channel. | |
3051 | * | |
3052 | * Return 0 on success or else a negative value. | |
3053 | */ | |
3054 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
fb45065e MD |
3055 | struct ust_app_channel *ua_chan, |
3056 | struct ust_app *app) | |
7972aab2 DG |
3057 | { |
3058 | int ret = 0; | |
3059 | struct ust_app_stream *stream, *stmp; | |
3060 | ||
3061 | assert(reg_chan); | |
3062 | assert(ua_chan); | |
3063 | ||
3064 | DBG2("UST app setup buffer registry stream"); | |
3065 | ||
3066 | /* Send all streams to application. */ | |
3067 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
3068 | struct buffer_reg_stream *reg_stream; | |
3069 | ||
3070 | ret = buffer_reg_stream_create(®_stream); | |
3071 | if (ret < 0) { | |
3072 | goto error; | |
3073 | } | |
3074 | ||
3075 | /* | |
3076 | * Keep original pointer and nullify it in the stream so the delete | |
3077 | * stream call does not release the object. | |
3078 | */ | |
3079 | reg_stream->obj.ust = stream->obj; | |
3080 | stream->obj = NULL; | |
3081 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 3082 | |
7972aab2 DG |
3083 | /* We don't need the streams anymore. */ |
3084 | cds_list_del(&stream->list); | |
fb45065e | 3085 | delete_ust_app_stream(-1, stream, app); |
7972aab2 | 3086 | } |
421cb601 | 3087 | |
7972aab2 DG |
3088 | error: |
3089 | return ret; | |
3090 | } | |
3091 | ||
3092 | /* | |
3093 | * Create a buffer registry channel for the given session registry and | |
3094 | * application channel object. If regp pointer is valid, it's set with the | |
3095 | * created object. Important, the created object is NOT added to the session | |
3096 | * registry hash table. | |
3097 | * | |
3098 | * Return 0 on success else a negative value. | |
3099 | */ | |
3100 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
3101 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
3102 | { | |
3103 | int ret; | |
3104 | struct buffer_reg_channel *reg_chan = NULL; | |
3105 | ||
3106 | assert(reg_sess); | |
3107 | assert(ua_chan); | |
3108 | ||
3109 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
3110 | ||
3111 | /* Create buffer registry channel. */ | |
3112 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
3113 | if (ret < 0) { | |
3114 | goto error_create; | |
421cb601 | 3115 | } |
7972aab2 DG |
3116 | assert(reg_chan); |
3117 | reg_chan->consumer_key = ua_chan->key; | |
8c924c7b | 3118 | reg_chan->subbuf_size = ua_chan->attr.subbuf_size; |
d07ceecd | 3119 | reg_chan->num_subbuf = ua_chan->attr.num_subbuf; |
421cb601 | 3120 | |
7972aab2 DG |
3121 | /* Create and add a channel registry to session. */ |
3122 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
3123 | ua_chan->tracing_channel_id); | |
3124 | if (ret < 0) { | |
3125 | goto error; | |
d88aee68 | 3126 | } |
7972aab2 | 3127 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 3128 | |
7972aab2 DG |
3129 | if (regp) { |
3130 | *regp = reg_chan; | |
3d8ca23b | 3131 | } |
d88aee68 | 3132 | |
7972aab2 | 3133 | return 0; |
3d8ca23b DG |
3134 | |
3135 | error: | |
7972aab2 DG |
3136 | /* Safe because the registry channel object was not added to any HT. */ |
3137 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
3138 | error_create: | |
3d8ca23b | 3139 | return ret; |
421cb601 DG |
3140 | } |
3141 | ||
55cc08a6 | 3142 | /* |
7972aab2 DG |
3143 | * Setup buffer registry channel for the given session registry and application |
3144 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 3145 | * |
7972aab2 | 3146 | * Return 0 on success else a negative value. |
55cc08a6 | 3147 | */ |
7972aab2 | 3148 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
fb45065e MD |
3149 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan, |
3150 | struct ust_app *app) | |
55cc08a6 | 3151 | { |
7972aab2 | 3152 | int ret; |
55cc08a6 | 3153 | |
7972aab2 DG |
3154 | assert(reg_sess); |
3155 | assert(reg_chan); | |
3156 | assert(ua_chan); | |
3157 | assert(ua_chan->obj); | |
55cc08a6 | 3158 | |
7972aab2 | 3159 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 3160 | |
7972aab2 | 3161 | /* Setup all streams for the registry. */ |
fb45065e | 3162 | ret = setup_buffer_reg_streams(reg_chan, ua_chan, app); |
7972aab2 | 3163 | if (ret < 0) { |
55cc08a6 DG |
3164 | goto error; |
3165 | } | |
3166 | ||
7972aab2 DG |
3167 | reg_chan->obj.ust = ua_chan->obj; |
3168 | ua_chan->obj = NULL; | |
55cc08a6 | 3169 | |
7972aab2 | 3170 | return 0; |
55cc08a6 DG |
3171 | |
3172 | error: | |
7972aab2 DG |
3173 | buffer_reg_channel_remove(reg_sess, reg_chan); |
3174 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
3175 | return ret; |
3176 | } | |
3177 | ||
edb67388 | 3178 | /* |
7972aab2 | 3179 | * Send buffer registry channel to the application. |
d0b96690 | 3180 | * |
7972aab2 | 3181 | * Return 0 on success else a negative value. |
edb67388 | 3182 | */ |
7972aab2 DG |
3183 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
3184 | struct ust_app *app, struct ust_app_session *ua_sess, | |
3185 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
3186 | { |
3187 | int ret; | |
7972aab2 | 3188 | struct buffer_reg_stream *reg_stream; |
edb67388 | 3189 | |
7972aab2 DG |
3190 | assert(reg_chan); |
3191 | assert(app); | |
3192 | assert(ua_sess); | |
3193 | assert(ua_chan); | |
3194 | ||
3195 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
3196 | ||
3197 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
3198 | if (ret < 0) { |
3199 | goto error; | |
3200 | } | |
3201 | ||
7972aab2 DG |
3202 | /* Send channel to the application. */ |
3203 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
3204 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
3205 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
3206 | goto error; | |
3207 | } else if (ret < 0) { | |
7972aab2 DG |
3208 | goto error; |
3209 | } | |
3210 | ||
3211 | health_code_update(); | |
3212 | ||
3213 | /* Send all streams to application. */ | |
3214 | pthread_mutex_lock(®_chan->stream_list_lock); | |
3215 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
3216 | struct ust_app_stream stream; | |
3217 | ||
3218 | ret = duplicate_stream_object(reg_stream, &stream); | |
3219 | if (ret < 0) { | |
3220 | goto error_stream_unlock; | |
3221 | } | |
3222 | ||
3223 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
3224 | if (ret < 0) { | |
fb45065e | 3225 | (void) release_ust_app_stream(-1, &stream, app); |
a7169585 MD |
3226 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
3227 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
a7169585 | 3228 | } |
7972aab2 DG |
3229 | goto error_stream_unlock; |
3230 | } | |
edb67388 | 3231 | |
7972aab2 DG |
3232 | /* |
3233 | * The return value is not important here. This function will output an | |
3234 | * error if needed. | |
3235 | */ | |
fb45065e | 3236 | (void) release_ust_app_stream(-1, &stream, app); |
7972aab2 DG |
3237 | } |
3238 | ua_chan->is_sent = 1; | |
3239 | ||
3240 | error_stream_unlock: | |
3241 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
3242 | error: |
3243 | return ret; | |
3244 | } | |
3245 | ||
9730260e | 3246 | /* |
7972aab2 DG |
3247 | * Create and send to the application the created buffers with per UID buffers. |
3248 | * | |
9acdc1d6 | 3249 | * This MUST be called with a RCU read side lock acquired. |
71e0a100 | 3250 | * The session list lock and the session's lock must be acquired. |
9acdc1d6 | 3251 | * |
7972aab2 | 3252 | * Return 0 on success else a negative value. |
9730260e | 3253 | */ |
7972aab2 DG |
3254 | static int create_channel_per_uid(struct ust_app *app, |
3255 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
3256 | struct ust_app_channel *ua_chan) | |
9730260e DG |
3257 | { |
3258 | int ret; | |
7972aab2 DG |
3259 | struct buffer_reg_uid *reg_uid; |
3260 | struct buffer_reg_channel *reg_chan; | |
e32d7f27 | 3261 | struct ltt_session *session = NULL; |
e098433c JG |
3262 | enum lttng_error_code notification_ret; |
3263 | struct ust_registry_channel *chan_reg; | |
9730260e | 3264 | |
7972aab2 DG |
3265 | assert(app); |
3266 | assert(usess); | |
3267 | assert(ua_sess); | |
3268 | assert(ua_chan); | |
3269 | ||
3270 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
3271 | ||
3272 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
3273 | /* | |
3274 | * The session creation handles the creation of this global registry | |
3275 | * object. If none can be find, there is a code flow problem or a | |
3276 | * teardown race. | |
3277 | */ | |
3278 | assert(reg_uid); | |
3279 | ||
3280 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
3281 | reg_uid); | |
2721f7ea JG |
3282 | if (reg_chan) { |
3283 | goto send_channel; | |
3284 | } | |
7972aab2 | 3285 | |
2721f7ea JG |
3286 | /* Create the buffer registry channel object. */ |
3287 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
3288 | if (ret < 0) { | |
3289 | ERR("Error creating the UST channel \"%s\" registry instance", | |
f14256d6 | 3290 | ua_chan->name); |
2721f7ea JG |
3291 | goto error; |
3292 | } | |
f14256d6 | 3293 | |
e098433c JG |
3294 | session = session_find_by_id(ua_sess->tracing_id); |
3295 | assert(session); | |
3296 | assert(pthread_mutex_trylock(&session->lock)); | |
3297 | assert(session_trylock_list()); | |
3298 | ||
2721f7ea JG |
3299 | /* |
3300 | * Create the buffers on the consumer side. This call populates the | |
3301 | * ust app channel object with all streams and data object. | |
3302 | */ | |
3303 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
e098433c | 3304 | app->bits_per_long, reg_uid->registry->reg.ust, |
d2956687 | 3305 | session->most_recent_chunk_id.value); |
2721f7ea JG |
3306 | if (ret < 0) { |
3307 | ERR("Error creating UST channel \"%s\" on the consumer daemon", | |
3308 | ua_chan->name); | |
7972aab2 DG |
3309 | |
3310 | /* | |
2721f7ea JG |
3311 | * Let's remove the previously created buffer registry channel so |
3312 | * it's not visible anymore in the session registry. | |
7972aab2 | 3313 | */ |
2721f7ea JG |
3314 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, |
3315 | ua_chan->tracing_channel_id, false); | |
3316 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
3317 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
3318 | goto error; | |
7972aab2 DG |
3319 | } |
3320 | ||
2721f7ea JG |
3321 | /* |
3322 | * Setup the streams and add it to the session registry. | |
3323 | */ | |
3324 | ret = setup_buffer_reg_channel(reg_uid->registry, | |
3325 | ua_chan, reg_chan, app); | |
3326 | if (ret < 0) { | |
3327 | ERR("Error setting up UST channel \"%s\"", ua_chan->name); | |
3328 | goto error; | |
3329 | } | |
3330 | ||
e098433c JG |
3331 | /* Notify the notification subsystem of the channel's creation. */ |
3332 | pthread_mutex_lock(®_uid->registry->reg.ust->lock); | |
3333 | chan_reg = ust_registry_channel_find(reg_uid->registry->reg.ust, | |
3334 | ua_chan->tracing_channel_id); | |
3335 | assert(chan_reg); | |
3336 | chan_reg->consumer_key = ua_chan->key; | |
3337 | chan_reg = NULL; | |
3338 | pthread_mutex_unlock(®_uid->registry->reg.ust->lock); | |
e9404c27 | 3339 | |
e098433c JG |
3340 | notification_ret = notification_thread_command_add_channel( |
3341 | notification_thread_handle, session->name, | |
ff588497 JR |
3342 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
3343 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
3344 | ua_chan->name, | |
470cc211 | 3345 | ua_chan->key, LTTNG_DOMAIN_UST, |
e098433c JG |
3346 | ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf); |
3347 | if (notification_ret != LTTNG_OK) { | |
3348 | ret = - (int) notification_ret; | |
3349 | ERR("Failed to add channel to notification thread"); | |
3350 | goto error; | |
e9404c27 JG |
3351 | } |
3352 | ||
2721f7ea | 3353 | send_channel: |
66ff8e3f JG |
3354 | /* Send buffers to the application. */ |
3355 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
3356 | if (ret < 0) { | |
3357 | if (ret != -ENOTCONN) { | |
3358 | ERR("Error sending channel to application"); | |
3359 | } | |
3360 | goto error; | |
3361 | } | |
3362 | ||
9730260e | 3363 | error: |
e32d7f27 JG |
3364 | if (session) { |
3365 | session_put(session); | |
3366 | } | |
9730260e DG |
3367 | return ret; |
3368 | } | |
3369 | ||
78f0bacd | 3370 | /* |
7972aab2 DG |
3371 | * Create and send to the application the created buffers with per PID buffers. |
3372 | * | |
fad1ed2f | 3373 | * Called with UST app session lock held. |
71e0a100 | 3374 | * The session list lock and the session's lock must be acquired. |
fad1ed2f | 3375 | * |
7972aab2 | 3376 | * Return 0 on success else a negative value. |
78f0bacd | 3377 | */ |
7972aab2 DG |
3378 | static int create_channel_per_pid(struct ust_app *app, |
3379 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
3380 | struct ust_app_channel *ua_chan) | |
78f0bacd | 3381 | { |
8535a6d9 | 3382 | int ret; |
7972aab2 | 3383 | struct ust_registry_session *registry; |
e9404c27 | 3384 | enum lttng_error_code cmd_ret; |
e32d7f27 | 3385 | struct ltt_session *session = NULL; |
e9404c27 JG |
3386 | uint64_t chan_reg_key; |
3387 | struct ust_registry_channel *chan_reg; | |
78f0bacd | 3388 | |
7972aab2 DG |
3389 | assert(app); |
3390 | assert(usess); | |
3391 | assert(ua_sess); | |
3392 | assert(ua_chan); | |
3393 | ||
3394 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
3395 | ||
3396 | rcu_read_lock(); | |
3397 | ||
3398 | registry = get_session_registry(ua_sess); | |
fad1ed2f | 3399 | /* The UST app session lock is held, registry shall not be null. */ |
7972aab2 DG |
3400 | assert(registry); |
3401 | ||
3402 | /* Create and add a new channel registry to session. */ | |
3403 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd | 3404 | if (ret < 0) { |
f14256d6 MD |
3405 | ERR("Error creating the UST channel \"%s\" registry instance", |
3406 | ua_chan->name); | |
78f0bacd DG |
3407 | goto error; |
3408 | } | |
3409 | ||
e098433c JG |
3410 | session = session_find_by_id(ua_sess->tracing_id); |
3411 | assert(session); | |
3412 | ||
3413 | assert(pthread_mutex_trylock(&session->lock)); | |
3414 | assert(session_trylock_list()); | |
3415 | ||
7972aab2 DG |
3416 | /* Create and get channel on the consumer side. */ |
3417 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
e098433c | 3418 | app->bits_per_long, registry, |
d2956687 | 3419 | session->most_recent_chunk_id.value); |
7972aab2 | 3420 | if (ret < 0) { |
f14256d6 MD |
3421 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
3422 | ua_chan->name); | |
5b951542 | 3423 | goto error_remove_from_registry; |
7972aab2 DG |
3424 | } |
3425 | ||
3426 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
3427 | if (ret < 0) { | |
a7169585 MD |
3428 | if (ret != -ENOTCONN) { |
3429 | ERR("Error sending channel to application"); | |
3430 | } | |
5b951542 | 3431 | goto error_remove_from_registry; |
7972aab2 | 3432 | } |
8535a6d9 | 3433 | |
e9404c27 JG |
3434 | chan_reg_key = ua_chan->key; |
3435 | pthread_mutex_lock(®istry->lock); | |
3436 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
3437 | assert(chan_reg); | |
3438 | chan_reg->consumer_key = ua_chan->key; | |
3439 | pthread_mutex_unlock(®istry->lock); | |
3440 | ||
3441 | cmd_ret = notification_thread_command_add_channel( | |
3442 | notification_thread_handle, session->name, | |
ff588497 JR |
3443 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
3444 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
3445 | ua_chan->name, | |
470cc211 | 3446 | ua_chan->key, LTTNG_DOMAIN_UST, |
e9404c27 JG |
3447 | ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf); |
3448 | if (cmd_ret != LTTNG_OK) { | |
3449 | ret = - (int) cmd_ret; | |
3450 | ERR("Failed to add channel to notification thread"); | |
5b951542 | 3451 | goto error_remove_from_registry; |
e9404c27 JG |
3452 | } |
3453 | ||
5b951542 MD |
3454 | error_remove_from_registry: |
3455 | if (ret) { | |
3456 | ust_registry_channel_del_free(registry, ua_chan->key, false); | |
3457 | } | |
78f0bacd | 3458 | error: |
7972aab2 | 3459 | rcu_read_unlock(); |
e32d7f27 JG |
3460 | if (session) { |
3461 | session_put(session); | |
3462 | } | |
78f0bacd DG |
3463 | return ret; |
3464 | } | |
3465 | ||
3466 | /* | |
7972aab2 | 3467 | * From an already allocated ust app channel, create the channel buffers if |
88e3c2f5 | 3468 | * needed and send them to the application. This MUST be called with a RCU read |
7972aab2 DG |
3469 | * side lock acquired. |
3470 | * | |
fad1ed2f JR |
3471 | * Called with UST app session lock held. |
3472 | * | |
a7169585 MD |
3473 | * Return 0 on success or else a negative value. Returns -ENOTCONN if |
3474 | * the application exited concurrently. | |
78f0bacd | 3475 | */ |
88e3c2f5 | 3476 | static int ust_app_channel_send(struct ust_app *app, |
7972aab2 DG |
3477 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, |
3478 | struct ust_app_channel *ua_chan) | |
78f0bacd | 3479 | { |
7972aab2 | 3480 | int ret; |
78f0bacd | 3481 | |
7972aab2 DG |
3482 | assert(app); |
3483 | assert(usess); | |
88e3c2f5 | 3484 | assert(usess->active); |
7972aab2 DG |
3485 | assert(ua_sess); |
3486 | assert(ua_chan); | |
3487 | ||
3488 | /* Handle buffer type before sending the channel to the application. */ | |
3489 | switch (usess->buffer_type) { | |
3490 | case LTTNG_BUFFER_PER_UID: | |
3491 | { | |
3492 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
3493 | if (ret < 0) { | |
3494 | goto error; | |
3495 | } | |
3496 | break; | |
3497 | } | |
3498 | case LTTNG_BUFFER_PER_PID: | |
3499 | { | |
3500 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
3501 | if (ret < 0) { | |
3502 | goto error; | |
3503 | } | |
3504 | break; | |
3505 | } | |
3506 | default: | |
3507 | assert(0); | |
3508 | ret = -EINVAL; | |
78f0bacd DG |
3509 | goto error; |
3510 | } | |
3511 | ||
7972aab2 DG |
3512 | /* Initialize ust objd object using the received handle and add it. */ |
3513 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
3514 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 3515 | |
7972aab2 DG |
3516 | /* If channel is not enabled, disable it on the tracer */ |
3517 | if (!ua_chan->enabled) { | |
3518 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
3519 | if (ret < 0) { | |
3520 | goto error; | |
3521 | } | |
78f0bacd DG |
3522 | } |
3523 | ||
3524 | error: | |
3525 | return ret; | |
3526 | } | |
3527 | ||
284d8f55 | 3528 | /* |
88e3c2f5 | 3529 | * Create UST app channel and return it through ua_chanp if not NULL. |
d0b96690 | 3530 | * |
36b588ed | 3531 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 | 3532 | * |
88e3c2f5 | 3533 | * Return 0 on success or else a negative value. |
284d8f55 | 3534 | */ |
88e3c2f5 JG |
3535 | static int ust_app_channel_allocate(struct ust_app_session *ua_sess, |
3536 | struct ltt_ust_channel *uchan, | |
fc4b93fa | 3537 | enum lttng_ust_abi_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 3538 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
3539 | { |
3540 | int ret = 0; | |
bec39940 DG |
3541 | struct lttng_ht_iter iter; |
3542 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
3543 | struct ust_app_channel *ua_chan; |
3544 | ||
3545 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3546 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
3547 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 3548 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 3549 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 3550 | goto end; |
5b4a0ec0 DG |
3551 | } |
3552 | ||
d0b96690 | 3553 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
3554 | if (ua_chan == NULL) { |
3555 | /* Only malloc can fail here */ | |
4d710ac2 | 3556 | ret = -ENOMEM; |
88e3c2f5 | 3557 | goto error; |
fc34caaa DG |
3558 | } |
3559 | shadow_copy_channel(ua_chan, uchan); | |
3560 | ||
ffe60014 DG |
3561 | /* Set channel type. */ |
3562 | ua_chan->attr.type = type; | |
3563 | ||
d0b96690 DG |
3564 | /* Only add the channel if successful on the tracer side. */ |
3565 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
fc34caaa | 3566 | end: |
4d710ac2 DG |
3567 | if (ua_chanp) { |
3568 | *ua_chanp = ua_chan; | |
3569 | } | |
3570 | ||
3571 | /* Everything went well. */ | |
3572 | return 0; | |
5b4a0ec0 DG |
3573 | |
3574 | error: | |
4d710ac2 | 3575 | return ret; |
5b4a0ec0 DG |
3576 | } |
3577 | ||
3578 | /* | |
3579 | * Create UST app event and create it on the tracer side. | |
d0b96690 | 3580 | * |
993578ff | 3581 | * Must be called with the RCU read side lock held. |
d0b96690 | 3582 | * Called with ust app session mutex held. |
5b4a0ec0 | 3583 | */ |
edb67388 DG |
3584 | static |
3585 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
3586 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
3587 | struct ust_app *app) | |
284d8f55 | 3588 | { |
edb67388 | 3589 | int ret = 0; |
5b4a0ec0 | 3590 | struct ust_app_event *ua_event; |
284d8f55 | 3591 | |
edb67388 DG |
3592 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
3593 | if (ua_event == NULL) { | |
20533947 | 3594 | /* Only failure mode of alloc_ust_app_event(). */ |
edb67388 | 3595 | ret = -ENOMEM; |
fc34caaa | 3596 | goto end; |
5b4a0ec0 | 3597 | } |
edb67388 | 3598 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 3599 | |
edb67388 | 3600 | /* Create it on the tracer side */ |
5b4a0ec0 | 3601 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 3602 | if (ret < 0) { |
e9f11505 JG |
3603 | /* |
3604 | * Not found previously means that it does not exist on the | |
3605 | * tracer. If the application reports that the event existed, | |
3606 | * it means there is a bug in the sessiond or lttng-ust | |
3607 | * (or corruption, etc.) | |
3608 | */ | |
3609 | if (ret == -LTTNG_UST_ERR_EXIST) { | |
3610 | ERR("Tracer for application reported that an event being created already existed: " | |
3611 | "event_name = \"%s\", pid = %d, ppid = %d, uid = %d, gid = %d", | |
3612 | uevent->attr.name, | |
3613 | app->pid, app->ppid, app->uid, | |
3614 | app->gid); | |
3615 | } | |
284d8f55 DG |
3616 | goto error; |
3617 | } | |
3618 | ||
d0b96690 | 3619 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 3620 | |
993578ff JR |
3621 | DBG2("UST app create event completed: app = '%s' (ppid: %d)", |
3622 | app->name, app->ppid); | |
7f79d3a1 | 3623 | |
edb67388 | 3624 | end: |
fc34caaa DG |
3625 | return ret; |
3626 | ||
5b4a0ec0 | 3627 | error: |
fc34caaa | 3628 | /* Valid. Calling here is already in a read side lock */ |
fb45065e | 3629 | delete_ust_app_event(-1, ua_event, app); |
edb67388 | 3630 | return ret; |
5b4a0ec0 DG |
3631 | } |
3632 | ||
993578ff JR |
3633 | /* |
3634 | * Create UST app event notifier rule and create it on the tracer side. | |
3635 | * | |
3636 | * Must be called with the RCU read side lock held. | |
3637 | * Called with ust app session mutex held. | |
3638 | */ | |
3639 | static | |
267d66aa JR |
3640 | int create_ust_app_event_notifier_rule(struct lttng_trigger *trigger, |
3641 | struct ust_app *app) | |
993578ff JR |
3642 | { |
3643 | int ret = 0; | |
3644 | struct ust_app_event_notifier_rule *ua_event_notifier_rule; | |
3645 | ||
267d66aa | 3646 | ua_event_notifier_rule = alloc_ust_app_event_notifier_rule(trigger); |
993578ff JR |
3647 | if (ua_event_notifier_rule == NULL) { |
3648 | ret = -ENOMEM; | |
3649 | goto end; | |
3650 | } | |
3651 | ||
3652 | /* Create it on the tracer side. */ | |
3653 | ret = create_ust_event_notifier(app, ua_event_notifier_rule); | |
3654 | if (ret < 0) { | |
3655 | /* | |
3656 | * Not found previously means that it does not exist on the | |
3657 | * tracer. If the application reports that the event existed, | |
3658 | * it means there is a bug in the sessiond or lttng-ust | |
3659 | * (or corruption, etc.) | |
3660 | */ | |
3661 | if (ret == -LTTNG_UST_ERR_EXIST) { | |
3662 | ERR("Tracer for application reported that an event notifier being created already exists: " | |
3663 | "token = \"%" PRIu64 "\", pid = %d, ppid = %d, uid = %d, gid = %d", | |
267d66aa | 3664 | lttng_trigger_get_tracer_token(trigger), |
993578ff JR |
3665 | app->pid, app->ppid, app->uid, |
3666 | app->gid); | |
3667 | } | |
3668 | goto error; | |
3669 | } | |
3670 | ||
3671 | lttng_ht_add_unique_u64(app->token_to_event_notifier_rule_ht, | |
3672 | &ua_event_notifier_rule->node); | |
3673 | ||
3674 | DBG2("UST app create token event rule completed: app = '%s' (ppid: %d), token = %" PRIu64, | |
267d66aa | 3675 | app->name, app->ppid, lttng_trigger_get_tracer_token(trigger)); |
993578ff JR |
3676 | |
3677 | end: | |
3678 | return ret; | |
3679 | ||
3680 | error: | |
3681 | /* The RCU read side lock is already being held by the caller. */ | |
3682 | delete_ust_app_event_notifier_rule(-1, ua_event_notifier_rule, app); | |
3683 | return ret; | |
3684 | } | |
3685 | ||
5b4a0ec0 DG |
3686 | /* |
3687 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 3688 | * |
7972aab2 | 3689 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
3690 | */ |
3691 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
ad7a9107 | 3692 | struct ust_app *app, struct consumer_output *consumer) |
5b4a0ec0 DG |
3693 | { |
3694 | int ret = 0; | |
ffe60014 | 3695 | struct ust_app_channel *metadata; |
d88aee68 | 3696 | struct consumer_socket *socket; |
7972aab2 | 3697 | struct ust_registry_session *registry; |
e32d7f27 | 3698 | struct ltt_session *session = NULL; |
5b4a0ec0 | 3699 | |
ffe60014 DG |
3700 | assert(ua_sess); |
3701 | assert(app); | |
d88aee68 | 3702 | assert(consumer); |
5b4a0ec0 | 3703 | |
7972aab2 | 3704 | registry = get_session_registry(ua_sess); |
fad1ed2f | 3705 | /* The UST app session is held registry shall not be null. */ |
7972aab2 DG |
3706 | assert(registry); |
3707 | ||
ce34fcd0 MD |
3708 | pthread_mutex_lock(®istry->lock); |
3709 | ||
1b532a60 DG |
3710 | /* Metadata already exists for this registry or it was closed previously */ |
3711 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
3712 | ret = 0; |
3713 | goto error; | |
5b4a0ec0 DG |
3714 | } |
3715 | ||
ffe60014 | 3716 | /* Allocate UST metadata */ |
d0b96690 | 3717 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
3718 | if (!metadata) { |
3719 | /* malloc() failed */ | |
3720 | ret = -ENOMEM; | |
3721 | goto error; | |
3722 | } | |
5b4a0ec0 | 3723 | |
ad7a9107 | 3724 | memcpy(&metadata->attr, &ua_sess->metadata_attr, sizeof(metadata->attr)); |
5b4a0ec0 | 3725 | |
7972aab2 DG |
3726 | /* Need one fd for the channel. */ |
3727 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
3728 | if (ret < 0) { | |
3729 | ERR("Exhausted number of available FD upon create metadata"); | |
3730 | goto error; | |
3731 | } | |
3732 | ||
4dc3dfc5 DG |
3733 | /* Get the right consumer socket for the application. */ |
3734 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
3735 | if (!socket) { | |
3736 | ret = -EINVAL; | |
3737 | goto error_consumer; | |
3738 | } | |
3739 | ||
331744e3 JD |
3740 | /* |
3741 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
3742 | * to the registry *before* we ask the consumer so we avoid the race of the | |
3743 | * consumer requesting the metadata and the ask_channel call on our side | |
3744 | * did not returned yet. | |
3745 | */ | |
3746 | registry->metadata_key = metadata->key; | |
3747 | ||
e098433c JG |
3748 | session = session_find_by_id(ua_sess->tracing_id); |
3749 | assert(session); | |
3750 | ||
3751 | assert(pthread_mutex_trylock(&session->lock)); | |
3752 | assert(session_trylock_list()); | |
3753 | ||
d88aee68 DG |
3754 | /* |
3755 | * Ask the metadata channel creation to the consumer. The metadata object | |
3756 | * will be created by the consumer and kept their. However, the stream is | |
3757 | * never added or monitored until we do a first push metadata to the | |
3758 | * consumer. | |
3759 | */ | |
7972aab2 | 3760 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
d2956687 | 3761 | registry, session->current_trace_chunk); |
d88aee68 | 3762 | if (ret < 0) { |
f2a444f1 DG |
3763 | /* Nullify the metadata key so we don't try to close it later on. */ |
3764 | registry->metadata_key = 0; | |
d88aee68 DG |
3765 | goto error_consumer; |
3766 | } | |
3767 | ||
3768 | /* | |
3769 | * The setup command will make the metadata stream be sent to the relayd, | |
3770 | * if applicable, and the thread managing the metadatas. This is important | |
3771 | * because after this point, if an error occurs, the only way the stream | |
3772 | * can be deleted is to be monitored in the consumer. | |
3773 | */ | |
7972aab2 | 3774 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 3775 | if (ret < 0) { |
f2a444f1 DG |
3776 | /* Nullify the metadata key so we don't try to close it later on. */ |
3777 | registry->metadata_key = 0; | |
d88aee68 | 3778 | goto error_consumer; |
5b4a0ec0 DG |
3779 | } |
3780 | ||
7972aab2 DG |
3781 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
3782 | metadata->key, app->pid); | |
5b4a0ec0 | 3783 | |
d88aee68 | 3784 | error_consumer: |
b80f0b6c | 3785 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 3786 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 3787 | error: |
ce34fcd0 | 3788 | pthread_mutex_unlock(®istry->lock); |
e32d7f27 JG |
3789 | if (session) { |
3790 | session_put(session); | |
3791 | } | |
ffe60014 | 3792 | return ret; |
5b4a0ec0 DG |
3793 | } |
3794 | ||
5b4a0ec0 | 3795 | /* |
d88aee68 DG |
3796 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
3797 | * acquired before calling this function. | |
5b4a0ec0 DG |
3798 | */ |
3799 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
3800 | { | |
d88aee68 | 3801 | struct ust_app *app = NULL; |
bec39940 DG |
3802 | struct lttng_ht_node_ulong *node; |
3803 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 3804 | |
bec39940 DG |
3805 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
3806 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
3807 | if (node == NULL) { |
3808 | DBG2("UST app no found with pid %d", pid); | |
3809 | goto error; | |
3810 | } | |
5b4a0ec0 DG |
3811 | |
3812 | DBG2("Found UST app by pid %d", pid); | |
3813 | ||
d88aee68 | 3814 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
3815 | |
3816 | error: | |
d88aee68 | 3817 | return app; |
5b4a0ec0 DG |
3818 | } |
3819 | ||
d88aee68 DG |
3820 | /* |
3821 | * Allocate and init an UST app object using the registration information and | |
3822 | * the command socket. This is called when the command socket connects to the | |
3823 | * session daemon. | |
3824 | * | |
3825 | * The object is returned on success or else NULL. | |
3826 | */ | |
d0b96690 | 3827 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 3828 | { |
5e2abfaf | 3829 | int ret; |
d0b96690 | 3830 | struct ust_app *lta = NULL; |
da873412 | 3831 | struct lttng_pipe *event_notifier_event_source_pipe = NULL; |
d0b96690 DG |
3832 | |
3833 | assert(msg); | |
3834 | assert(sock >= 0); | |
3835 | ||
3836 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 3837 | |
173af62f DG |
3838 | if ((msg->bits_per_long == 64 && |
3839 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
3840 | || (msg->bits_per_long == 32 && | |
3841 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 3842 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
3843 | "%d-bit long, but no consumerd for this size is available.\n", |
3844 | msg->name, msg->pid, msg->bits_per_long); | |
3845 | goto error; | |
3f2c5fcc | 3846 | } |
d0b96690 | 3847 | |
5e2abfaf JG |
3848 | /* |
3849 | * Reserve the two file descriptors of the event source pipe. The write | |
3850 | * end will be closed once it is passed to the application, at which | |
3851 | * point a single 'put' will be performed. | |
3852 | */ | |
3853 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
3854 | if (ret) { | |
3855 | ERR("Failed to reserve two file descriptors for the event source pipe while creating a new application instance: app = '%s' (ppid: %d)", | |
3856 | msg->name, (int) msg->ppid); | |
3857 | goto error; | |
3858 | } | |
3859 | ||
da873412 JR |
3860 | event_notifier_event_source_pipe = lttng_pipe_open(FD_CLOEXEC); |
3861 | if (!event_notifier_event_source_pipe) { | |
3862 | PERROR("Failed to open application event source pipe: '%s' (ppid = %d)", | |
3863 | msg->name, msg->ppid); | |
3864 | goto error; | |
3865 | } | |
3866 | ||
5b4a0ec0 DG |
3867 | lta = zmalloc(sizeof(struct ust_app)); |
3868 | if (lta == NULL) { | |
3869 | PERROR("malloc"); | |
da873412 | 3870 | goto error_free_pipe; |
5b4a0ec0 DG |
3871 | } |
3872 | ||
da873412 JR |
3873 | lta->event_notifier_group.event_pipe = event_notifier_event_source_pipe; |
3874 | ||
5b4a0ec0 DG |
3875 | lta->ppid = msg->ppid; |
3876 | lta->uid = msg->uid; | |
3877 | lta->gid = msg->gid; | |
d0b96690 | 3878 | |
7753dea8 | 3879 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
3880 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
3881 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
3882 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
3883 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
3884 | lta->long_alignment = msg->long_alignment; | |
3885 | lta->byte_order = msg->byte_order; | |
3886 | ||
5b4a0ec0 DG |
3887 | lta->v_major = msg->major; |
3888 | lta->v_minor = msg->minor; | |
d9bf3ca4 | 3889 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 | 3890 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
10b56aef | 3891 | lta->ust_sessions_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3892 | lta->notify_sock = -1; |
993578ff | 3893 | lta->token_to_event_notifier_rule_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d88aee68 DG |
3894 | |
3895 | /* Copy name and make sure it's NULL terminated. */ | |
3896 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
3897 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
3898 | ||
3899 | /* | |
3900 | * Before this can be called, when receiving the registration information, | |
3901 | * the application compatibility is checked. So, at this point, the | |
3902 | * application can work with this session daemon. | |
3903 | */ | |
d0b96690 | 3904 | lta->compatible = 1; |
5b4a0ec0 | 3905 | |
852d0037 | 3906 | lta->pid = msg->pid; |
d0b96690 | 3907 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 3908 | lta->sock = sock; |
fb45065e | 3909 | pthread_mutex_init(<a->sock_lock, NULL); |
d0b96690 | 3910 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 3911 | |
d42f20df | 3912 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
d0b96690 | 3913 | return lta; |
da873412 JR |
3914 | |
3915 | error_free_pipe: | |
3916 | lttng_pipe_destroy(event_notifier_event_source_pipe); | |
5e2abfaf | 3917 | lttng_fd_put(LTTNG_FD_APPS, 2); |
da873412 JR |
3918 | error: |
3919 | return NULL; | |
d0b96690 DG |
3920 | } |
3921 | ||
d88aee68 DG |
3922 | /* |
3923 | * For a given application object, add it to every hash table. | |
3924 | */ | |
d0b96690 DG |
3925 | void ust_app_add(struct ust_app *app) |
3926 | { | |
3927 | assert(app); | |
3928 | assert(app->notify_sock >= 0); | |
3929 | ||
940c4592 JR |
3930 | app->registration_time = time(NULL); |
3931 | ||
5b4a0ec0 | 3932 | rcu_read_lock(); |
852d0037 DG |
3933 | |
3934 | /* | |
3935 | * On a re-registration, we want to kick out the previous registration of | |
3936 | * that pid | |
3937 | */ | |
d0b96690 | 3938 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
3939 | |
3940 | /* | |
3941 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
3942 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
3943 | * already in the table. | |
3944 | */ | |
d0b96690 | 3945 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 3946 | |
d0b96690 DG |
3947 | /* Add application to the notify socket hash table. */ |
3948 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
3949 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 3950 | |
d0b96690 | 3951 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
3952 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
3953 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
3954 | app->v_minor); | |
5b4a0ec0 | 3955 | |
d0b96690 DG |
3956 | rcu_read_unlock(); |
3957 | } | |
3958 | ||
d88aee68 DG |
3959 | /* |
3960 | * Set the application version into the object. | |
3961 | * | |
3962 | * Return 0 on success else a negative value either an errno code or a | |
3963 | * LTTng-UST error code. | |
3964 | */ | |
d0b96690 DG |
3965 | int ust_app_version(struct ust_app *app) |
3966 | { | |
d88aee68 DG |
3967 | int ret; |
3968 | ||
d0b96690 | 3969 | assert(app); |
d88aee68 | 3970 | |
fb45065e | 3971 | pthread_mutex_lock(&app->sock_lock); |
d88aee68 | 3972 | ret = ustctl_tracer_version(app->sock, &app->version); |
fb45065e | 3973 | pthread_mutex_unlock(&app->sock_lock); |
d88aee68 DG |
3974 | if (ret < 0) { |
3975 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
5368d366 | 3976 | ERR("UST app %d version failed with ret %d", app->sock, ret); |
d88aee68 | 3977 | } else { |
5368d366 | 3978 | DBG3("UST app %d version failed. Application is dead", app->sock); |
d88aee68 DG |
3979 | } |
3980 | } | |
3981 | ||
3982 | return ret; | |
5b4a0ec0 DG |
3983 | } |
3984 | ||
da873412 JR |
3985 | /* |
3986 | * Setup the base event notifier group. | |
3987 | * | |
3988 | * Return 0 on success else a negative value either an errno code or a | |
3989 | * LTTng-UST error code. | |
3990 | */ | |
3991 | int ust_app_setup_event_notifier_group(struct ust_app *app) | |
3992 | { | |
3993 | int ret; | |
3994 | int event_pipe_write_fd; | |
fc4b93fa | 3995 | struct lttng_ust_abi_object_data *event_notifier_group = NULL; |
da873412 JR |
3996 | enum lttng_error_code lttng_ret; |
3997 | ||
3998 | assert(app); | |
3999 | ||
4000 | /* Get the write side of the pipe. */ | |
4001 | event_pipe_write_fd = lttng_pipe_get_writefd( | |
4002 | app->event_notifier_group.event_pipe); | |
4003 | ||
4004 | pthread_mutex_lock(&app->sock_lock); | |
4005 | ret = ustctl_create_event_notifier_group(app->sock, | |
4006 | event_pipe_write_fd, &event_notifier_group); | |
4007 | pthread_mutex_unlock(&app->sock_lock); | |
4008 | if (ret < 0) { | |
4009 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
4010 | ERR("Failed to create application event notifier group: ret = %d, app socket fd = %d, event_pipe_write_fd = %d", | |
4011 | ret, app->sock, event_pipe_write_fd); | |
4012 | } else { | |
4013 | DBG("Failed to create application event notifier group (application is dead): app socket fd = %d", | |
4014 | app->sock); | |
4015 | } | |
4016 | ||
4017 | goto error; | |
4018 | } | |
4019 | ||
5d4193fd JG |
4020 | ret = lttng_pipe_write_close(app->event_notifier_group.event_pipe); |
4021 | if (ret) { | |
4022 | ERR("Failed to close write end of the application's event source pipe: app = '%s' (ppid = %d)", | |
4023 | app->name, app->ppid); | |
4024 | goto error; | |
4025 | } | |
4026 | ||
5e2abfaf JG |
4027 | /* |
4028 | * Release the file descriptor that was reserved for the write-end of | |
4029 | * the pipe. | |
4030 | */ | |
4031 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
4032 | ||
da873412 JR |
4033 | lttng_ret = notification_thread_command_add_tracer_event_source( |
4034 | notification_thread_handle, | |
4035 | lttng_pipe_get_readfd(app->event_notifier_group.event_pipe), | |
4036 | LTTNG_DOMAIN_UST); | |
4037 | if (lttng_ret != LTTNG_OK) { | |
4038 | ERR("Failed to add tracer event source to notification thread"); | |
4039 | ret = - 1; | |
4040 | goto error; | |
4041 | } | |
4042 | ||
4043 | /* Assign handle only when the complete setup is valid. */ | |
4044 | app->event_notifier_group.object = event_notifier_group; | |
4045 | return ret; | |
4046 | ||
4047 | error: | |
4048 | ustctl_release_object(app->sock, app->event_notifier_group.object); | |
4049 | free(app->event_notifier_group.object); | |
4050 | return ret; | |
4051 | } | |
4052 | ||
5b4a0ec0 DG |
4053 | /* |
4054 | * Unregister app by removing it from the global traceable app list and freeing | |
4055 | * the data struct. | |
4056 | * | |
4057 | * The socket is already closed at this point so no close to sock. | |
4058 | */ | |
4059 | void ust_app_unregister(int sock) | |
4060 | { | |
4061 | struct ust_app *lta; | |
bec39940 | 4062 | struct lttng_ht_node_ulong *node; |
c4b88406 | 4063 | struct lttng_ht_iter ust_app_sock_iter; |
bec39940 | 4064 | struct lttng_ht_iter iter; |
d42f20df | 4065 | struct ust_app_session *ua_sess; |
525b0740 | 4066 | int ret; |
5b4a0ec0 DG |
4067 | |
4068 | rcu_read_lock(); | |
886459c6 | 4069 | |
5b4a0ec0 | 4070 | /* Get the node reference for a call_rcu */ |
c4b88406 MD |
4071 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &ust_app_sock_iter); |
4072 | node = lttng_ht_iter_get_node_ulong(&ust_app_sock_iter); | |
d0b96690 | 4073 | assert(node); |
284d8f55 | 4074 | |
852d0037 | 4075 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
4076 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
4077 | ||
d88aee68 | 4078 | /* |
ce34fcd0 MD |
4079 | * For per-PID buffers, perform "push metadata" and flush all |
4080 | * application streams before removing app from hash tables, | |
4081 | * ensuring proper behavior of data_pending check. | |
c4b88406 | 4082 | * Remove sessions so they are not visible during deletion. |
d88aee68 | 4083 | */ |
d42f20df DG |
4084 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, |
4085 | node.node) { | |
7972aab2 DG |
4086 | struct ust_registry_session *registry; |
4087 | ||
d42f20df DG |
4088 | ret = lttng_ht_del(lta->sessions, &iter); |
4089 | if (ret) { | |
4090 | /* The session was already removed so scheduled for teardown. */ | |
4091 | continue; | |
4092 | } | |
4093 | ||
ce34fcd0 MD |
4094 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { |
4095 | (void) ust_app_flush_app_session(lta, ua_sess); | |
4096 | } | |
c4b88406 | 4097 | |
d42f20df DG |
4098 | /* |
4099 | * Add session to list for teardown. This is safe since at this point we | |
4100 | * are the only one using this list. | |
4101 | */ | |
d88aee68 DG |
4102 | pthread_mutex_lock(&ua_sess->lock); |
4103 | ||
b161602a MD |
4104 | if (ua_sess->deleted) { |
4105 | pthread_mutex_unlock(&ua_sess->lock); | |
4106 | continue; | |
4107 | } | |
4108 | ||
d88aee68 DG |
4109 | /* |
4110 | * Normally, this is done in the delete session process which is | |
4111 | * executed in the call rcu below. However, upon registration we can't | |
4112 | * afford to wait for the grace period before pushing data or else the | |
4113 | * data pending feature can race between the unregistration and stop | |
4114 | * command where the data pending command is sent *before* the grace | |
4115 | * period ended. | |
4116 | * | |
4117 | * The close metadata below nullifies the metadata pointer in the | |
4118 | * session so the delete session will NOT push/close a second time. | |
4119 | */ | |
7972aab2 | 4120 | registry = get_session_registry(ua_sess); |
ce34fcd0 | 4121 | if (registry) { |
7972aab2 DG |
4122 | /* Push metadata for application before freeing the application. */ |
4123 | (void) push_metadata(registry, ua_sess->consumer); | |
4124 | ||
4125 | /* | |
4126 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
4127 | * metadata only on destroy trace session in this case. Also, the |
4128 | * previous push metadata could have flag the metadata registry to | |
4129 | * close so don't send a close command if closed. | |
7972aab2 | 4130 | */ |
ce34fcd0 | 4131 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
4132 | /* And ask to close it for this session registry. */ |
4133 | (void) close_metadata(registry, ua_sess->consumer); | |
4134 | } | |
4135 | } | |
d42f20df | 4136 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
c4b88406 | 4137 | |
d88aee68 | 4138 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
4139 | } |
4140 | ||
c4b88406 MD |
4141 | /* Remove application from PID hash table */ |
4142 | ret = lttng_ht_del(ust_app_ht_by_sock, &ust_app_sock_iter); | |
4143 | assert(!ret); | |
4144 | ||
4145 | /* | |
4146 | * Remove application from notify hash table. The thread handling the | |
4147 | * notify socket could have deleted the node so ignore on error because | |
c48239ca JG |
4148 | * either way it's valid. The close of that socket is handled by the |
4149 | * apps_notify_thread. | |
c4b88406 MD |
4150 | */ |
4151 | iter.iter.node = <a->notify_sock_n.node; | |
4152 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
4153 | ||
4154 | /* | |
4155 | * Ignore return value since the node might have been removed before by an | |
4156 | * add replace during app registration because the PID can be reassigned by | |
4157 | * the OS. | |
4158 | */ | |
4159 | iter.iter.node = <a->pid_n.node; | |
4160 | ret = lttng_ht_del(ust_app_ht, &iter); | |
4161 | if (ret) { | |
4162 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
4163 | lta->pid); | |
4164 | } | |
4165 | ||
852d0037 DG |
4166 | /* Free memory */ |
4167 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
4168 | ||
5b4a0ec0 DG |
4169 | rcu_read_unlock(); |
4170 | return; | |
284d8f55 DG |
4171 | } |
4172 | ||
5b4a0ec0 DG |
4173 | /* |
4174 | * Fill events array with all events name of all registered apps. | |
4175 | */ | |
4176 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 4177 | { |
5b4a0ec0 DG |
4178 | int ret, handle; |
4179 | size_t nbmem, count = 0; | |
bec39940 | 4180 | struct lttng_ht_iter iter; |
5b4a0ec0 | 4181 | struct ust_app *app; |
c617c0c6 | 4182 | struct lttng_event *tmp_event; |
421cb601 | 4183 | |
5b4a0ec0 | 4184 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
4185 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
4186 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
4187 | PERROR("zmalloc ust app events"); |
4188 | ret = -ENOMEM; | |
421cb601 DG |
4189 | goto error; |
4190 | } | |
4191 | ||
5b4a0ec0 | 4192 | rcu_read_lock(); |
421cb601 | 4193 | |
852d0037 | 4194 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
fc4b93fa | 4195 | struct lttng_ust_abi_tracepoint_iter uiter; |
ac3bd9c0 | 4196 | |
840cb59c | 4197 | health_code_update(); |
86acf0da | 4198 | |
e0c7ec2b DG |
4199 | if (!app->compatible) { |
4200 | /* | |
4201 | * TODO: In time, we should notice the caller of this error by | |
4202 | * telling him that this is a version error. | |
4203 | */ | |
4204 | continue; | |
4205 | } | |
fb45065e | 4206 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4207 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 4208 | if (handle < 0) { |
ffe60014 DG |
4209 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
4210 | ERR("UST app list events getting handle failed for app pid %d", | |
4211 | app->pid); | |
4212 | } | |
fb45065e | 4213 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 DG |
4214 | continue; |
4215 | } | |
421cb601 | 4216 | |
852d0037 | 4217 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 4218 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
4219 | /* Handle ustctl error. */ |
4220 | if (ret < 0) { | |
fb45065e MD |
4221 | int release_ret; |
4222 | ||
a2ba1ab0 | 4223 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
4224 | ERR("UST app tp list get failed for app %d with ret %d", |
4225 | app->sock, ret); | |
4226 | } else { | |
4227 | DBG3("UST app tp list get failed. Application is dead"); | |
3757b385 DG |
4228 | /* |
4229 | * This is normal behavior, an application can die during the | |
4230 | * creation process. Don't report an error so the execution can | |
4231 | * continue normally. Continue normal execution. | |
4232 | */ | |
4233 | break; | |
ffe60014 | 4234 | } |
98f595d4 | 4235 | free(tmp_event); |
fb45065e | 4236 | release_ret = ustctl_release_handle(app->sock, handle); |
68313703 JG |
4237 | if (release_ret < 0 && |
4238 | release_ret != -LTTNG_UST_ERR_EXITING && | |
4239 | release_ret != -EPIPE) { | |
fb45065e MD |
4240 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
4241 | } | |
4242 | pthread_mutex_unlock(&app->sock_lock); | |
ffe60014 DG |
4243 | goto rcu_error; |
4244 | } | |
4245 | ||
840cb59c | 4246 | health_code_update(); |
815564d8 | 4247 | if (count >= nbmem) { |
d7b3776f | 4248 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
4249 | struct lttng_event *new_tmp_event; |
4250 | size_t new_nbmem; | |
4251 | ||
4252 | new_nbmem = nbmem << 1; | |
4253 | DBG2("Reallocating event list from %zu to %zu entries", | |
4254 | nbmem, new_nbmem); | |
4255 | new_tmp_event = realloc(tmp_event, | |
4256 | new_nbmem * sizeof(struct lttng_event)); | |
4257 | if (new_tmp_event == NULL) { | |
fb45065e MD |
4258 | int release_ret; |
4259 | ||
5b4a0ec0 | 4260 | PERROR("realloc ust app events"); |
c617c0c6 | 4261 | free(tmp_event); |
5b4a0ec0 | 4262 | ret = -ENOMEM; |
fb45065e | 4263 | release_ret = ustctl_release_handle(app->sock, handle); |
68313703 JG |
4264 | if (release_ret < 0 && |
4265 | release_ret != -LTTNG_UST_ERR_EXITING && | |
4266 | release_ret != -EPIPE) { | |
fb45065e MD |
4267 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
4268 | } | |
4269 | pthread_mutex_unlock(&app->sock_lock); | |
5b4a0ec0 DG |
4270 | goto rcu_error; |
4271 | } | |
53efb85a MD |
4272 | /* Zero the new memory */ |
4273 | memset(new_tmp_event + nbmem, 0, | |
4274 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
4275 | nbmem = new_nbmem; | |
4276 | tmp_event = new_tmp_event; | |
5b4a0ec0 | 4277 | } |
fc4b93fa | 4278 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_ABI_SYM_NAME_LEN); |
c617c0c6 | 4279 | tmp_event[count].loglevel = uiter.loglevel; |
fc4b93fa | 4280 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_ABI_TRACEPOINT; |
c617c0c6 MD |
4281 | tmp_event[count].pid = app->pid; |
4282 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 4283 | count++; |
421cb601 | 4284 | } |
fb45065e MD |
4285 | ret = ustctl_release_handle(app->sock, handle); |
4286 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 | 4287 | if (ret < 0 && ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
fb45065e MD |
4288 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
4289 | } | |
421cb601 DG |
4290 | } |
4291 | ||
5b4a0ec0 | 4292 | ret = count; |
c617c0c6 | 4293 | *events = tmp_event; |
421cb601 | 4294 | |
5b4a0ec0 | 4295 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 4296 | |
5b4a0ec0 DG |
4297 | rcu_error: |
4298 | rcu_read_unlock(); | |
421cb601 | 4299 | error: |
840cb59c | 4300 | health_code_update(); |
5b4a0ec0 | 4301 | return ret; |
421cb601 DG |
4302 | } |
4303 | ||
f37d259d MD |
4304 | /* |
4305 | * Fill events array with all events name of all registered apps. | |
4306 | */ | |
4307 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
4308 | { | |
4309 | int ret, handle; | |
4310 | size_t nbmem, count = 0; | |
4311 | struct lttng_ht_iter iter; | |
4312 | struct ust_app *app; | |
c617c0c6 | 4313 | struct lttng_event_field *tmp_event; |
f37d259d MD |
4314 | |
4315 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
4316 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
4317 | if (tmp_event == NULL) { | |
f37d259d MD |
4318 | PERROR("zmalloc ust app event fields"); |
4319 | ret = -ENOMEM; | |
4320 | goto error; | |
4321 | } | |
4322 | ||
4323 | rcu_read_lock(); | |
4324 | ||
4325 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
fc4b93fa | 4326 | struct lttng_ust_abi_field_iter uiter; |
f37d259d | 4327 | |
840cb59c | 4328 | health_code_update(); |
86acf0da | 4329 | |
f37d259d MD |
4330 | if (!app->compatible) { |
4331 | /* | |
4332 | * TODO: In time, we should notice the caller of this error by | |
4333 | * telling him that this is a version error. | |
4334 | */ | |
4335 | continue; | |
4336 | } | |
fb45065e | 4337 | pthread_mutex_lock(&app->sock_lock); |
f37d259d MD |
4338 | handle = ustctl_tracepoint_field_list(app->sock); |
4339 | if (handle < 0) { | |
ffe60014 DG |
4340 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
4341 | ERR("UST app list field getting handle failed for app pid %d", | |
4342 | app->pid); | |
4343 | } | |
fb45065e | 4344 | pthread_mutex_unlock(&app->sock_lock); |
f37d259d MD |
4345 | continue; |
4346 | } | |
4347 | ||
4348 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 4349 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
4350 | /* Handle ustctl error. */ |
4351 | if (ret < 0) { | |
fb45065e MD |
4352 | int release_ret; |
4353 | ||
a2ba1ab0 | 4354 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
4355 | ERR("UST app tp list field failed for app %d with ret %d", |
4356 | app->sock, ret); | |
4357 | } else { | |
4358 | DBG3("UST app tp list field failed. Application is dead"); | |
3757b385 DG |
4359 | /* |
4360 | * This is normal behavior, an application can die during the | |
4361 | * creation process. Don't report an error so the execution can | |
98f595d4 | 4362 | * continue normally. Reset list and count for next app. |
3757b385 DG |
4363 | */ |
4364 | break; | |
ffe60014 | 4365 | } |
98f595d4 | 4366 | free(tmp_event); |
fb45065e MD |
4367 | release_ret = ustctl_release_handle(app->sock, handle); |
4368 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
4369 | if (release_ret < 0 && |
4370 | release_ret != -LTTNG_UST_ERR_EXITING && | |
4371 | release_ret != -EPIPE) { | |
fb45065e MD |
4372 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
4373 | } | |
ffe60014 DG |
4374 | goto rcu_error; |
4375 | } | |
4376 | ||
840cb59c | 4377 | health_code_update(); |
f37d259d | 4378 | if (count >= nbmem) { |
d7b3776f | 4379 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
4380 | struct lttng_event_field *new_tmp_event; |
4381 | size_t new_nbmem; | |
4382 | ||
4383 | new_nbmem = nbmem << 1; | |
4384 | DBG2("Reallocating event field list from %zu to %zu entries", | |
4385 | nbmem, new_nbmem); | |
4386 | new_tmp_event = realloc(tmp_event, | |
4387 | new_nbmem * sizeof(struct lttng_event_field)); | |
4388 | if (new_tmp_event == NULL) { | |
fb45065e MD |
4389 | int release_ret; |
4390 | ||
f37d259d | 4391 | PERROR("realloc ust app event fields"); |
c617c0c6 | 4392 | free(tmp_event); |
f37d259d | 4393 | ret = -ENOMEM; |
fb45065e MD |
4394 | release_ret = ustctl_release_handle(app->sock, handle); |
4395 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
4396 | if (release_ret && |
4397 | release_ret != -LTTNG_UST_ERR_EXITING && | |
4398 | release_ret != -EPIPE) { | |
fb45065e MD |
4399 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
4400 | } | |
f37d259d MD |
4401 | goto rcu_error; |
4402 | } | |
53efb85a MD |
4403 | /* Zero the new memory */ |
4404 | memset(new_tmp_event + nbmem, 0, | |
4405 | (new_nbmem - nbmem) * sizeof(struct lttng_event_field)); | |
4406 | nbmem = new_nbmem; | |
4407 | tmp_event = new_tmp_event; | |
f37d259d | 4408 | } |
f37d259d | 4409 | |
fc4b93fa | 4410 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_ABI_SYM_NAME_LEN); |
2e84128e DG |
4411 | /* Mapping between these enums matches 1 to 1. */ |
4412 | tmp_event[count].type = (enum lttng_event_field_type) uiter.type; | |
c617c0c6 | 4413 | tmp_event[count].nowrite = uiter.nowrite; |
f37d259d | 4414 | |
fc4b93fa | 4415 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_ABI_SYM_NAME_LEN); |
c617c0c6 | 4416 | tmp_event[count].event.loglevel = uiter.loglevel; |
2e84128e | 4417 | tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; |
c617c0c6 MD |
4418 | tmp_event[count].event.pid = app->pid; |
4419 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
4420 | count++; |
4421 | } | |
fb45065e MD |
4422 | ret = ustctl_release_handle(app->sock, handle); |
4423 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
4424 | if (ret < 0 && |
4425 | ret != -LTTNG_UST_ERR_EXITING && | |
4426 | ret != -EPIPE) { | |
fb45065e MD |
4427 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
4428 | } | |
f37d259d MD |
4429 | } |
4430 | ||
4431 | ret = count; | |
c617c0c6 | 4432 | *fields = tmp_event; |
f37d259d MD |
4433 | |
4434 | DBG2("UST app list event fields done (%zu events)", count); | |
4435 | ||
4436 | rcu_error: | |
4437 | rcu_read_unlock(); | |
4438 | error: | |
840cb59c | 4439 | health_code_update(); |
f37d259d MD |
4440 | return ret; |
4441 | } | |
4442 | ||
5b4a0ec0 DG |
4443 | /* |
4444 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
4445 | * |
4446 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
4447 | */ |
4448 | void ust_app_clean_list(void) | |
421cb601 | 4449 | { |
5b4a0ec0 | 4450 | int ret; |
659ed79f | 4451 | struct ust_app *app; |
bec39940 | 4452 | struct lttng_ht_iter iter; |
421cb601 | 4453 | |
5b4a0ec0 | 4454 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 4455 | |
5b4a0ec0 | 4456 | rcu_read_lock(); |
421cb601 | 4457 | |
faadaa3a JG |
4458 | /* Cleanup notify socket hash table */ |
4459 | if (ust_app_ht_by_notify_sock) { | |
4460 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
4461 | notify_sock_n.node) { | |
b69a1b40 JG |
4462 | /* |
4463 | * Assert that all notifiers are gone as all triggers | |
4464 | * are unregistered prior to this clean-up. | |
4465 | */ | |
4466 | assert(lttng_ht_get_count(app->token_to_event_notifier_rule_ht) == 0); | |
faadaa3a | 4467 | |
faadaa3a JG |
4468 | ust_app_notify_sock_unregister(app->notify_sock); |
4469 | } | |
4470 | } | |
4471 | ||
f1b711c4 MD |
4472 | if (ust_app_ht) { |
4473 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4474 | ret = lttng_ht_del(ust_app_ht, &iter); | |
4475 | assert(!ret); | |
4476 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
4477 | } | |
421cb601 DG |
4478 | } |
4479 | ||
852d0037 | 4480 | /* Cleanup socket hash table */ |
f1b711c4 MD |
4481 | if (ust_app_ht_by_sock) { |
4482 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, | |
4483 | sock_n.node) { | |
4484 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); | |
4485 | assert(!ret); | |
4486 | } | |
bec39940 | 4487 | } |
852d0037 | 4488 | |
36b588ed | 4489 | rcu_read_unlock(); |
d88aee68 | 4490 | |
bec39940 | 4491 | /* Destroy is done only when the ht is empty */ |
f1b711c4 MD |
4492 | if (ust_app_ht) { |
4493 | ht_cleanup_push(ust_app_ht); | |
4494 | } | |
4495 | if (ust_app_ht_by_sock) { | |
4496 | ht_cleanup_push(ust_app_ht_by_sock); | |
4497 | } | |
4498 | if (ust_app_ht_by_notify_sock) { | |
4499 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
4500 | } | |
5b4a0ec0 DG |
4501 | } |
4502 | ||
4503 | /* | |
4504 | * Init UST app hash table. | |
4505 | */ | |
57703f6e | 4506 | int ust_app_ht_alloc(void) |
5b4a0ec0 | 4507 | { |
bec39940 | 4508 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
4509 | if (!ust_app_ht) { |
4510 | return -1; | |
4511 | } | |
852d0037 | 4512 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
4513 | if (!ust_app_ht_by_sock) { |
4514 | return -1; | |
4515 | } | |
d0b96690 | 4516 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
4517 | if (!ust_app_ht_by_notify_sock) { |
4518 | return -1; | |
4519 | } | |
4520 | return 0; | |
421cb601 DG |
4521 | } |
4522 | ||
78f0bacd DG |
4523 | /* |
4524 | * For a specific UST session, disable the channel for all registered apps. | |
4525 | */ | |
35a9059d | 4526 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
4527 | struct ltt_ust_channel *uchan) |
4528 | { | |
4529 | int ret = 0; | |
bec39940 DG |
4530 | struct lttng_ht_iter iter; |
4531 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
4532 | struct ust_app *app; |
4533 | struct ust_app_session *ua_sess; | |
8535a6d9 | 4534 | struct ust_app_channel *ua_chan; |
78f0bacd | 4535 | |
88e3c2f5 | 4536 | assert(usess->active); |
d9bf3ca4 | 4537 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 4538 | uchan->name, usess->id); |
78f0bacd DG |
4539 | |
4540 | rcu_read_lock(); | |
4541 | ||
4542 | /* For every registered applications */ | |
852d0037 | 4543 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 4544 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
4545 | if (!app->compatible) { |
4546 | /* | |
4547 | * TODO: In time, we should notice the caller of this error by | |
4548 | * telling him that this is a version error. | |
4549 | */ | |
4550 | continue; | |
4551 | } | |
78f0bacd DG |
4552 | ua_sess = lookup_session_by_app(usess, app); |
4553 | if (ua_sess == NULL) { | |
4554 | continue; | |
4555 | } | |
4556 | ||
8535a6d9 | 4557 | /* Get channel */ |
bec39940 DG |
4558 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4559 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
4560 | /* If the session if found for the app, the channel must be there */ |
4561 | assert(ua_chan_node); | |
4562 | ||
4563 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4564 | /* The channel must not be already disabled */ | |
4565 | assert(ua_chan->enabled == 1); | |
4566 | ||
4567 | /* Disable channel onto application */ | |
4568 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
4569 | if (ret < 0) { |
4570 | /* XXX: We might want to report this error at some point... */ | |
4571 | continue; | |
4572 | } | |
4573 | } | |
4574 | ||
4575 | rcu_read_unlock(); | |
78f0bacd DG |
4576 | return ret; |
4577 | } | |
4578 | ||
4579 | /* | |
4580 | * For a specific UST session, enable the channel for all registered apps. | |
4581 | */ | |
35a9059d | 4582 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
4583 | struct ltt_ust_channel *uchan) |
4584 | { | |
4585 | int ret = 0; | |
bec39940 | 4586 | struct lttng_ht_iter iter; |
78f0bacd DG |
4587 | struct ust_app *app; |
4588 | struct ust_app_session *ua_sess; | |
4589 | ||
88e3c2f5 | 4590 | assert(usess->active); |
d9bf3ca4 | 4591 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 4592 | uchan->name, usess->id); |
78f0bacd DG |
4593 | |
4594 | rcu_read_lock(); | |
4595 | ||
4596 | /* For every registered applications */ | |
852d0037 | 4597 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4598 | if (!app->compatible) { |
4599 | /* | |
4600 | * TODO: In time, we should notice the caller of this error by | |
4601 | * telling him that this is a version error. | |
4602 | */ | |
4603 | continue; | |
4604 | } | |
78f0bacd DG |
4605 | ua_sess = lookup_session_by_app(usess, app); |
4606 | if (ua_sess == NULL) { | |
4607 | continue; | |
4608 | } | |
4609 | ||
4610 | /* Enable channel onto application */ | |
4611 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
4612 | if (ret < 0) { | |
4613 | /* XXX: We might want to report this error at some point... */ | |
4614 | continue; | |
4615 | } | |
4616 | } | |
4617 | ||
4618 | rcu_read_unlock(); | |
78f0bacd DG |
4619 | return ret; |
4620 | } | |
4621 | ||
b0a40d28 DG |
4622 | /* |
4623 | * Disable an event in a channel and for a specific session. | |
4624 | */ | |
35a9059d DG |
4625 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
4626 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
4627 | { |
4628 | int ret = 0; | |
bec39940 | 4629 | struct lttng_ht_iter iter, uiter; |
700c5a9d | 4630 | struct lttng_ht_node_str *ua_chan_node; |
b0a40d28 DG |
4631 | struct ust_app *app; |
4632 | struct ust_app_session *ua_sess; | |
4633 | struct ust_app_channel *ua_chan; | |
4634 | struct ust_app_event *ua_event; | |
4635 | ||
88e3c2f5 | 4636 | assert(usess->active); |
b0a40d28 | 4637 | DBG("UST app disabling event %s for all apps in channel " |
d9bf3ca4 MD |
4638 | "%s for session id %" PRIu64, |
4639 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
4640 | |
4641 | rcu_read_lock(); | |
4642 | ||
4643 | /* For all registered applications */ | |
852d0037 | 4644 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4645 | if (!app->compatible) { |
4646 | /* | |
4647 | * TODO: In time, we should notice the caller of this error by | |
4648 | * telling him that this is a version error. | |
4649 | */ | |
4650 | continue; | |
4651 | } | |
b0a40d28 DG |
4652 | ua_sess = lookup_session_by_app(usess, app); |
4653 | if (ua_sess == NULL) { | |
4654 | /* Next app */ | |
4655 | continue; | |
4656 | } | |
4657 | ||
4658 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
4659 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4660 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 4661 | if (ua_chan_node == NULL) { |
d9bf3ca4 | 4662 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 4663 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
4664 | continue; |
4665 | } | |
4666 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4667 | ||
700c5a9d JR |
4668 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
4669 | uevent->filter, uevent->attr.loglevel, | |
4670 | uevent->exclusion); | |
4671 | if (ua_event == NULL) { | |
b0a40d28 | 4672 | DBG2("Event %s not found in channel %s for app pid %d." |
852d0037 | 4673 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
4674 | continue; |
4675 | } | |
b0a40d28 | 4676 | |
7f79d3a1 | 4677 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
4678 | if (ret < 0) { |
4679 | /* XXX: Report error someday... */ | |
4680 | continue; | |
4681 | } | |
4682 | } | |
4683 | ||
4684 | rcu_read_unlock(); | |
88e3c2f5 JG |
4685 | return ret; |
4686 | } | |
4687 | ||
4688 | /* The ua_sess lock must be held by the caller. */ | |
4689 | static | |
4690 | int ust_app_channel_create(struct ltt_ust_session *usess, | |
4691 | struct ust_app_session *ua_sess, | |
4692 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
4693 | struct ust_app_channel **_ua_chan) | |
4694 | { | |
4695 | int ret = 0; | |
4696 | struct ust_app_channel *ua_chan = NULL; | |
4697 | ||
4698 | assert(ua_sess); | |
4699 | ASSERT_LOCKED(ua_sess->lock); | |
4700 | ||
4701 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, | |
4702 | sizeof(uchan->name))) { | |
4703 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, | |
4704 | &uchan->attr); | |
4705 | ret = 0; | |
4706 | } else { | |
4707 | struct ltt_ust_context *uctx = NULL; | |
4708 | ||
4709 | /* | |
4710 | * Create channel onto application and synchronize its | |
4711 | * configuration. | |
4712 | */ | |
4713 | ret = ust_app_channel_allocate(ua_sess, uchan, | |
fc4b93fa | 4714 | LTTNG_UST_ABI_CHAN_PER_CPU, usess, |
88e3c2f5 | 4715 | &ua_chan); |
88ebf5a7 JR |
4716 | if (ret < 0) { |
4717 | goto error; | |
4718 | } | |
4719 | ||
4720 | ret = ust_app_channel_send(app, usess, | |
4721 | ua_sess, ua_chan); | |
4722 | if (ret) { | |
4723 | goto error; | |
88e3c2f5 JG |
4724 | } |
4725 | ||
4726 | /* Add contexts. */ | |
4727 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { | |
4728 | ret = create_ust_app_channel_context(ua_chan, | |
4729 | &uctx->ctx, app); | |
4730 | if (ret) { | |
88ebf5a7 | 4731 | goto error; |
88e3c2f5 JG |
4732 | } |
4733 | } | |
4734 | } | |
88ebf5a7 JR |
4735 | |
4736 | error: | |
88e3c2f5 JG |
4737 | if (ret < 0) { |
4738 | switch (ret) { | |
4739 | case -ENOTCONN: | |
4740 | /* | |
4741 | * The application's socket is not valid. Either a bad socket | |
4742 | * or a timeout on it. We can't inform the caller that for a | |
4743 | * specific app, the session failed so lets continue here. | |
4744 | */ | |
4745 | ret = 0; /* Not an error. */ | |
4746 | break; | |
4747 | case -ENOMEM: | |
4748 | default: | |
4749 | break; | |
4750 | } | |
4751 | } | |
88ebf5a7 | 4752 | |
88e3c2f5 JG |
4753 | if (ret == 0 && _ua_chan) { |
4754 | /* | |
4755 | * Only return the application's channel on success. Note | |
4756 | * that the channel can still be part of the application's | |
4757 | * channel hashtable on error. | |
4758 | */ | |
4759 | *_ua_chan = ua_chan; | |
4760 | } | |
b0a40d28 DG |
4761 | return ret; |
4762 | } | |
4763 | ||
5b4a0ec0 | 4764 | /* |
edb67388 | 4765 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 4766 | */ |
35a9059d | 4767 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
4768 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4769 | { | |
4770 | int ret = 0; | |
bec39940 | 4771 | struct lttng_ht_iter iter, uiter; |
18eace3b | 4772 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
4773 | struct ust_app *app; |
4774 | struct ust_app_session *ua_sess; | |
4775 | struct ust_app_channel *ua_chan; | |
4776 | struct ust_app_event *ua_event; | |
48842b30 | 4777 | |
88e3c2f5 | 4778 | assert(usess->active); |
d9bf3ca4 | 4779 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 4780 | uevent->attr.name, usess->id); |
48842b30 | 4781 | |
edb67388 DG |
4782 | /* |
4783 | * NOTE: At this point, this function is called only if the session and | |
4784 | * channel passed are already created for all apps. and enabled on the | |
4785 | * tracer also. | |
4786 | */ | |
4787 | ||
48842b30 | 4788 | rcu_read_lock(); |
421cb601 DG |
4789 | |
4790 | /* For all registered applications */ | |
852d0037 | 4791 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4792 | if (!app->compatible) { |
4793 | /* | |
4794 | * TODO: In time, we should notice the caller of this error by | |
4795 | * telling him that this is a version error. | |
4796 | */ | |
4797 | continue; | |
4798 | } | |
edb67388 | 4799 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4800 | if (!ua_sess) { |
4801 | /* The application has problem or is probably dead. */ | |
4802 | continue; | |
4803 | } | |
ba767faf | 4804 | |
d0b96690 DG |
4805 | pthread_mutex_lock(&ua_sess->lock); |
4806 | ||
b161602a MD |
4807 | if (ua_sess->deleted) { |
4808 | pthread_mutex_unlock(&ua_sess->lock); | |
4809 | continue; | |
4810 | } | |
4811 | ||
edb67388 | 4812 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4813 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4814 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
a7169585 MD |
4815 | /* |
4816 | * It is possible that the channel cannot be found is | |
4817 | * the channel/event creation occurs concurrently with | |
4818 | * an application exit. | |
4819 | */ | |
4820 | if (!ua_chan_node) { | |
4821 | pthread_mutex_unlock(&ua_sess->lock); | |
4822 | continue; | |
4823 | } | |
edb67388 DG |
4824 | |
4825 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4826 | ||
18eace3b DG |
4827 | /* Get event node */ |
4828 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
39c5a3a7 | 4829 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 4830 | if (ua_event == NULL) { |
7f79d3a1 | 4831 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 4832 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 4833 | goto next_app; |
35a9059d | 4834 | } |
35a9059d DG |
4835 | |
4836 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
4837 | if (ret < 0) { | |
d0b96690 | 4838 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 4839 | goto error; |
48842b30 | 4840 | } |
d0b96690 DG |
4841 | next_app: |
4842 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
4843 | } |
4844 | ||
7f79d3a1 | 4845 | error: |
edb67388 | 4846 | rcu_read_unlock(); |
edb67388 DG |
4847 | return ret; |
4848 | } | |
4849 | ||
4850 | /* | |
4851 | * For a specific existing UST session and UST channel, creates the event for | |
4852 | * all registered apps. | |
4853 | */ | |
35a9059d | 4854 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
4855 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4856 | { | |
4857 | int ret = 0; | |
bec39940 DG |
4858 | struct lttng_ht_iter iter, uiter; |
4859 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
4860 | struct ust_app *app; |
4861 | struct ust_app_session *ua_sess; | |
4862 | struct ust_app_channel *ua_chan; | |
4863 | ||
88e3c2f5 | 4864 | assert(usess->active); |
d9bf3ca4 | 4865 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 4866 | uevent->attr.name, usess->id); |
edb67388 | 4867 | |
edb67388 DG |
4868 | rcu_read_lock(); |
4869 | ||
4870 | /* For all registered applications */ | |
852d0037 | 4871 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4872 | if (!app->compatible) { |
4873 | /* | |
4874 | * TODO: In time, we should notice the caller of this error by | |
4875 | * telling him that this is a version error. | |
4876 | */ | |
4877 | continue; | |
4878 | } | |
edb67388 | 4879 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4880 | if (!ua_sess) { |
4881 | /* The application has problem or is probably dead. */ | |
4882 | continue; | |
4883 | } | |
48842b30 | 4884 | |
d0b96690 | 4885 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
4886 | |
4887 | if (ua_sess->deleted) { | |
4888 | pthread_mutex_unlock(&ua_sess->lock); | |
4889 | continue; | |
4890 | } | |
4891 | ||
48842b30 | 4892 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4893 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4894 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
4895 | /* If the channel is not found, there is a code flow error */ |
4896 | assert(ua_chan_node); | |
4897 | ||
48842b30 DG |
4898 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
4899 | ||
edb67388 | 4900 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 4901 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 4902 | if (ret < 0) { |
49c336c1 | 4903 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
4904 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
4905 | break; | |
4906 | } | |
4907 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 4908 | uevent->attr.name, app->pid); |
5b4a0ec0 | 4909 | continue; |
48842b30 | 4910 | } |
48842b30 | 4911 | } |
5b4a0ec0 | 4912 | |
48842b30 | 4913 | rcu_read_unlock(); |
48842b30 DG |
4914 | return ret; |
4915 | } | |
4916 | ||
5b4a0ec0 DG |
4917 | /* |
4918 | * Start tracing for a specific UST session and app. | |
fad1ed2f JR |
4919 | * |
4920 | * Called with UST app session lock held. | |
4921 | * | |
5b4a0ec0 | 4922 | */ |
b34cbebf | 4923 | static |
421cb601 | 4924 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
4925 | { |
4926 | int ret = 0; | |
48842b30 | 4927 | struct ust_app_session *ua_sess; |
48842b30 | 4928 | |
852d0037 | 4929 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 4930 | |
509cbaf8 MD |
4931 | rcu_read_lock(); |
4932 | ||
e0c7ec2b DG |
4933 | if (!app->compatible) { |
4934 | goto end; | |
4935 | } | |
4936 | ||
421cb601 DG |
4937 | ua_sess = lookup_session_by_app(usess, app); |
4938 | if (ua_sess == NULL) { | |
d42f20df DG |
4939 | /* The session is in teardown process. Ignore and continue. */ |
4940 | goto end; | |
421cb601 | 4941 | } |
48842b30 | 4942 | |
d0b96690 DG |
4943 | pthread_mutex_lock(&ua_sess->lock); |
4944 | ||
b161602a MD |
4945 | if (ua_sess->deleted) { |
4946 | pthread_mutex_unlock(&ua_sess->lock); | |
4947 | goto end; | |
4948 | } | |
4949 | ||
b0a1c741 JR |
4950 | if (ua_sess->enabled) { |
4951 | pthread_mutex_unlock(&ua_sess->lock); | |
4952 | goto end; | |
4953 | } | |
4954 | ||
aea829b3 DG |
4955 | /* Upon restart, we skip the setup, already done */ |
4956 | if (ua_sess->started) { | |
8be98f9a | 4957 | goto skip_setup; |
aea829b3 | 4958 | } |
8be98f9a | 4959 | |
840cb59c | 4960 | health_code_update(); |
86acf0da | 4961 | |
8be98f9a | 4962 | skip_setup: |
a945cdc7 | 4963 | /* This starts the UST tracing */ |
fb45065e | 4964 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4965 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
fb45065e | 4966 | pthread_mutex_unlock(&app->sock_lock); |
421cb601 | 4967 | if (ret < 0) { |
ffe60014 DG |
4968 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4969 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
4970 | app->pid, ret); | |
4971 | } else { | |
4972 | DBG("UST app start session failed. Application is dead."); | |
3757b385 DG |
4973 | /* |
4974 | * This is normal behavior, an application can die during the | |
4975 | * creation process. Don't report an error so the execution can | |
4976 | * continue normally. | |
4977 | */ | |
4978 | pthread_mutex_unlock(&ua_sess->lock); | |
4979 | goto end; | |
ffe60014 | 4980 | } |
d0b96690 | 4981 | goto error_unlock; |
421cb601 | 4982 | } |
5b4a0ec0 | 4983 | |
55c3953d DG |
4984 | /* Indicate that the session has been started once */ |
4985 | ua_sess->started = 1; | |
b0a1c741 | 4986 | ua_sess->enabled = 1; |
55c3953d | 4987 | |
d0b96690 DG |
4988 | pthread_mutex_unlock(&ua_sess->lock); |
4989 | ||
840cb59c | 4990 | health_code_update(); |
86acf0da | 4991 | |
421cb601 | 4992 | /* Quiescent wait after starting trace */ |
fb45065e | 4993 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4994 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4995 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4996 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4997 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4998 | app->pid, ret); | |
4999 | } | |
48842b30 | 5000 | |
e0c7ec2b DG |
5001 | end: |
5002 | rcu_read_unlock(); | |
840cb59c | 5003 | health_code_update(); |
421cb601 | 5004 | return 0; |
48842b30 | 5005 | |
d0b96690 DG |
5006 | error_unlock: |
5007 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 5008 | rcu_read_unlock(); |
840cb59c | 5009 | health_code_update(); |
421cb601 DG |
5010 | return -1; |
5011 | } | |
48842b30 | 5012 | |
8be98f9a MD |
5013 | /* |
5014 | * Stop tracing for a specific UST session and app. | |
5015 | */ | |
b34cbebf | 5016 | static |
8be98f9a MD |
5017 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
5018 | { | |
5019 | int ret = 0; | |
5020 | struct ust_app_session *ua_sess; | |
7972aab2 | 5021 | struct ust_registry_session *registry; |
8be98f9a | 5022 | |
852d0037 | 5023 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
5024 | |
5025 | rcu_read_lock(); | |
5026 | ||
e0c7ec2b | 5027 | if (!app->compatible) { |
d88aee68 | 5028 | goto end_no_session; |
e0c7ec2b DG |
5029 | } |
5030 | ||
8be98f9a MD |
5031 | ua_sess = lookup_session_by_app(usess, app); |
5032 | if (ua_sess == NULL) { | |
d88aee68 | 5033 | goto end_no_session; |
8be98f9a MD |
5034 | } |
5035 | ||
d88aee68 DG |
5036 | pthread_mutex_lock(&ua_sess->lock); |
5037 | ||
b161602a MD |
5038 | if (ua_sess->deleted) { |
5039 | pthread_mutex_unlock(&ua_sess->lock); | |
5040 | goto end_no_session; | |
5041 | } | |
5042 | ||
9bc07046 DG |
5043 | /* |
5044 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
5045 | * that was never started. It's possible since we can have a fail start |
5046 | * from either the application manager thread or the command thread. Simply | |
5047 | * indicate that this is a stop error. | |
9bc07046 | 5048 | */ |
f9dfc3d9 | 5049 | if (!ua_sess->started) { |
c45536e1 DG |
5050 | goto error_rcu_unlock; |
5051 | } | |
7db205b5 | 5052 | |
840cb59c | 5053 | health_code_update(); |
86acf0da | 5054 | |
9d6c7d3f | 5055 | /* This inhibits UST tracing */ |
fb45065e | 5056 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 5057 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
fb45065e | 5058 | pthread_mutex_unlock(&app->sock_lock); |
9d6c7d3f | 5059 | if (ret < 0) { |
ffe60014 DG |
5060 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
5061 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
5062 | app->pid, ret); | |
5063 | } else { | |
5064 | DBG("UST app stop session failed. Application is dead."); | |
3757b385 DG |
5065 | /* |
5066 | * This is normal behavior, an application can die during the | |
5067 | * creation process. Don't report an error so the execution can | |
5068 | * continue normally. | |
5069 | */ | |
5070 | goto end_unlock; | |
ffe60014 | 5071 | } |
9d6c7d3f DG |
5072 | goto error_rcu_unlock; |
5073 | } | |
5074 | ||
840cb59c | 5075 | health_code_update(); |
b0a1c741 | 5076 | ua_sess->enabled = 0; |
86acf0da | 5077 | |
9d6c7d3f | 5078 | /* Quiescent wait after stopping trace */ |
fb45065e | 5079 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 5080 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 5081 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
5082 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
5083 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
5084 | app->pid, ret); | |
5085 | } | |
9d6c7d3f | 5086 | |
840cb59c | 5087 | health_code_update(); |
86acf0da | 5088 | |
b34cbebf | 5089 | registry = get_session_registry(ua_sess); |
fad1ed2f JR |
5090 | |
5091 | /* The UST app session is held registry shall not be null. */ | |
b34cbebf | 5092 | assert(registry); |
1b532a60 | 5093 | |
ce34fcd0 MD |
5094 | /* Push metadata for application before freeing the application. */ |
5095 | (void) push_metadata(registry, ua_sess->consumer); | |
b34cbebf | 5096 | |
3757b385 | 5097 | end_unlock: |
b34cbebf MD |
5098 | pthread_mutex_unlock(&ua_sess->lock); |
5099 | end_no_session: | |
5100 | rcu_read_unlock(); | |
5101 | health_code_update(); | |
5102 | return 0; | |
5103 | ||
5104 | error_rcu_unlock: | |
5105 | pthread_mutex_unlock(&ua_sess->lock); | |
5106 | rcu_read_unlock(); | |
5107 | health_code_update(); | |
5108 | return -1; | |
5109 | } | |
5110 | ||
b34cbebf | 5111 | static |
c4b88406 MD |
5112 | int ust_app_flush_app_session(struct ust_app *app, |
5113 | struct ust_app_session *ua_sess) | |
b34cbebf | 5114 | { |
c4b88406 | 5115 | int ret, retval = 0; |
b34cbebf | 5116 | struct lttng_ht_iter iter; |
b34cbebf | 5117 | struct ust_app_channel *ua_chan; |
c4b88406 | 5118 | struct consumer_socket *socket; |
b34cbebf | 5119 | |
c4b88406 | 5120 | DBG("Flushing app session buffers for ust app pid %d", app->pid); |
b34cbebf MD |
5121 | |
5122 | rcu_read_lock(); | |
5123 | ||
5124 | if (!app->compatible) { | |
c4b88406 | 5125 | goto end_not_compatible; |
b34cbebf MD |
5126 | } |
5127 | ||
5128 | pthread_mutex_lock(&ua_sess->lock); | |
5129 | ||
b161602a MD |
5130 | if (ua_sess->deleted) { |
5131 | goto end_deleted; | |
5132 | } | |
5133 | ||
b34cbebf MD |
5134 | health_code_update(); |
5135 | ||
9d6c7d3f | 5136 | /* Flushing buffers */ |
c4b88406 MD |
5137 | socket = consumer_find_socket_by_bitness(app->bits_per_long, |
5138 | ua_sess->consumer); | |
ce34fcd0 MD |
5139 | |
5140 | /* Flush buffers and push metadata. */ | |
5141 | switch (ua_sess->buffer_type) { | |
5142 | case LTTNG_BUFFER_PER_PID: | |
5143 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, | |
5144 | node.node) { | |
5145 | health_code_update(); | |
ce34fcd0 MD |
5146 | ret = consumer_flush_channel(socket, ua_chan->key); |
5147 | if (ret) { | |
5148 | ERR("Error flushing consumer channel"); | |
5149 | retval = -1; | |
5150 | continue; | |
5151 | } | |
8be98f9a | 5152 | } |
ce34fcd0 MD |
5153 | break; |
5154 | case LTTNG_BUFFER_PER_UID: | |
5155 | default: | |
5156 | assert(0); | |
5157 | break; | |
8be98f9a | 5158 | } |
8be98f9a | 5159 | |
840cb59c | 5160 | health_code_update(); |
86acf0da | 5161 | |
b161602a | 5162 | end_deleted: |
d88aee68 | 5163 | pthread_mutex_unlock(&ua_sess->lock); |
ce34fcd0 | 5164 | |
c4b88406 MD |
5165 | end_not_compatible: |
5166 | rcu_read_unlock(); | |
5167 | health_code_update(); | |
5168 | return retval; | |
5169 | } | |
5170 | ||
5171 | /* | |
ce34fcd0 MD |
5172 | * Flush buffers for all applications for a specific UST session. |
5173 | * Called with UST session lock held. | |
c4b88406 MD |
5174 | */ |
5175 | static | |
ce34fcd0 | 5176 | int ust_app_flush_session(struct ltt_ust_session *usess) |
c4b88406 MD |
5177 | |
5178 | { | |
99b1411c | 5179 | int ret = 0; |
c4b88406 | 5180 | |
ce34fcd0 | 5181 | DBG("Flushing session buffers for all ust apps"); |
c4b88406 MD |
5182 | |
5183 | rcu_read_lock(); | |
5184 | ||
ce34fcd0 MD |
5185 | /* Flush buffers and push metadata. */ |
5186 | switch (usess->buffer_type) { | |
5187 | case LTTNG_BUFFER_PER_UID: | |
5188 | { | |
5189 | struct buffer_reg_uid *reg; | |
5190 | struct lttng_ht_iter iter; | |
5191 | ||
5192 | /* Flush all per UID buffers associated to that session. */ | |
5193 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
5194 | struct ust_registry_session *ust_session_reg; | |
5195 | struct buffer_reg_channel *reg_chan; | |
5196 | struct consumer_socket *socket; | |
5197 | ||
5198 | /* Get consumer socket to use to push the metadata.*/ | |
5199 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
5200 | usess->consumer); | |
5201 | if (!socket) { | |
5202 | /* Ignore request if no consumer is found for the session. */ | |
5203 | continue; | |
5204 | } | |
5205 | ||
5206 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
5207 | reg_chan, node.node) { | |
5208 | /* | |
5209 | * The following call will print error values so the return | |
5210 | * code is of little importance because whatever happens, we | |
5211 | * have to try them all. | |
5212 | */ | |
5213 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
5214 | } | |
5215 | ||
5216 | ust_session_reg = reg->registry->reg.ust; | |
5217 | /* Push metadata. */ | |
5218 | (void) push_metadata(ust_session_reg, usess->consumer); | |
5219 | } | |
ce34fcd0 MD |
5220 | break; |
5221 | } | |
5222 | case LTTNG_BUFFER_PER_PID: | |
5223 | { | |
5224 | struct ust_app_session *ua_sess; | |
5225 | struct lttng_ht_iter iter; | |
5226 | struct ust_app *app; | |
5227 | ||
5228 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5229 | ua_sess = lookup_session_by_app(usess, app); | |
5230 | if (ua_sess == NULL) { | |
5231 | continue; | |
5232 | } | |
5233 | (void) ust_app_flush_app_session(app, ua_sess); | |
5234 | } | |
5235 | break; | |
5236 | } | |
5237 | default: | |
99b1411c | 5238 | ret = -1; |
ce34fcd0 MD |
5239 | assert(0); |
5240 | break; | |
c4b88406 | 5241 | } |
c4b88406 | 5242 | |
7db205b5 | 5243 | rcu_read_unlock(); |
840cb59c | 5244 | health_code_update(); |
c4b88406 | 5245 | return ret; |
8be98f9a MD |
5246 | } |
5247 | ||
0dd01979 MD |
5248 | static |
5249 | int ust_app_clear_quiescent_app_session(struct ust_app *app, | |
5250 | struct ust_app_session *ua_sess) | |
5251 | { | |
5252 | int ret = 0; | |
5253 | struct lttng_ht_iter iter; | |
5254 | struct ust_app_channel *ua_chan; | |
5255 | struct consumer_socket *socket; | |
5256 | ||
5257 | DBG("Clearing stream quiescent state for ust app pid %d", app->pid); | |
5258 | ||
5259 | rcu_read_lock(); | |
5260 | ||
5261 | if (!app->compatible) { | |
5262 | goto end_not_compatible; | |
5263 | } | |
5264 | ||
5265 | pthread_mutex_lock(&ua_sess->lock); | |
5266 | ||
5267 | if (ua_sess->deleted) { | |
5268 | goto end_unlock; | |
5269 | } | |
5270 | ||
5271 | health_code_update(); | |
5272 | ||
5273 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
5274 | ua_sess->consumer); | |
5275 | if (!socket) { | |
5276 | ERR("Failed to find consumer (%" PRIu32 ") socket", | |
5277 | app->bits_per_long); | |
5278 | ret = -1; | |
5279 | goto end_unlock; | |
5280 | } | |
5281 | ||
5282 | /* Clear quiescent state. */ | |
5283 | switch (ua_sess->buffer_type) { | |
5284 | case LTTNG_BUFFER_PER_PID: | |
5285 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, | |
5286 | ua_chan, node.node) { | |
5287 | health_code_update(); | |
5288 | ret = consumer_clear_quiescent_channel(socket, | |
5289 | ua_chan->key); | |
5290 | if (ret) { | |
5291 | ERR("Error clearing quiescent state for consumer channel"); | |
5292 | ret = -1; | |
5293 | continue; | |
5294 | } | |
5295 | } | |
5296 | break; | |
5297 | case LTTNG_BUFFER_PER_UID: | |
5298 | default: | |
5299 | assert(0); | |
5300 | ret = -1; | |
5301 | break; | |
5302 | } | |
5303 | ||
5304 | health_code_update(); | |
5305 | ||
5306 | end_unlock: | |
5307 | pthread_mutex_unlock(&ua_sess->lock); | |
5308 | ||
5309 | end_not_compatible: | |
5310 | rcu_read_unlock(); | |
5311 | health_code_update(); | |
5312 | return ret; | |
5313 | } | |
5314 | ||
5315 | /* | |
5316 | * Clear quiescent state in each stream for all applications for a | |
5317 | * specific UST session. | |
5318 | * Called with UST session lock held. | |
5319 | */ | |
5320 | static | |
5321 | int ust_app_clear_quiescent_session(struct ltt_ust_session *usess) | |
5322 | ||
5323 | { | |
5324 | int ret = 0; | |
5325 | ||
5326 | DBG("Clearing stream quiescent state for all ust apps"); | |
5327 | ||
5328 | rcu_read_lock(); | |
5329 | ||
5330 | switch (usess->buffer_type) { | |
5331 | case LTTNG_BUFFER_PER_UID: | |
5332 | { | |
5333 | struct lttng_ht_iter iter; | |
5334 | struct buffer_reg_uid *reg; | |
5335 | ||
5336 | /* | |
5337 | * Clear quiescent for all per UID buffers associated to | |
5338 | * that session. | |
5339 | */ | |
5340 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
5341 | struct consumer_socket *socket; | |
5342 | struct buffer_reg_channel *reg_chan; | |
5343 | ||
5344 | /* Get associated consumer socket.*/ | |
5345 | socket = consumer_find_socket_by_bitness( | |
5346 | reg->bits_per_long, usess->consumer); | |
5347 | if (!socket) { | |
5348 | /* | |
5349 | * Ignore request if no consumer is found for | |
5350 | * the session. | |
5351 | */ | |
5352 | continue; | |
5353 | } | |
5354 | ||
5355 | cds_lfht_for_each_entry(reg->registry->channels->ht, | |
5356 | &iter.iter, reg_chan, node.node) { | |
5357 | /* | |
5358 | * The following call will print error values so | |
5359 | * the return code is of little importance | |
5360 | * because whatever happens, we have to try them | |
5361 | * all. | |
5362 | */ | |
5363 | (void) consumer_clear_quiescent_channel(socket, | |
5364 | reg_chan->consumer_key); | |
5365 | } | |
5366 | } | |
5367 | break; | |
5368 | } | |
5369 | case LTTNG_BUFFER_PER_PID: | |
5370 | { | |
5371 | struct ust_app_session *ua_sess; | |
5372 | struct lttng_ht_iter iter; | |
5373 | struct ust_app *app; | |
5374 | ||
5375 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, | |
5376 | pid_n.node) { | |
5377 | ua_sess = lookup_session_by_app(usess, app); | |
5378 | if (ua_sess == NULL) { | |
5379 | continue; | |
5380 | } | |
5381 | (void) ust_app_clear_quiescent_app_session(app, | |
5382 | ua_sess); | |
5383 | } | |
5384 | break; | |
5385 | } | |
5386 | default: | |
5387 | ret = -1; | |
5388 | assert(0); | |
5389 | break; | |
5390 | } | |
5391 | ||
5392 | rcu_read_unlock(); | |
5393 | health_code_update(); | |
5394 | return ret; | |
5395 | } | |
5396 | ||
84cd17c6 MD |
5397 | /* |
5398 | * Destroy a specific UST session in apps. | |
5399 | */ | |
3353de95 | 5400 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 5401 | { |
ffe60014 | 5402 | int ret; |
84cd17c6 | 5403 | struct ust_app_session *ua_sess; |
bec39940 | 5404 | struct lttng_ht_iter iter; |
d9bf3ca4 | 5405 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 5406 | |
852d0037 | 5407 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
5408 | |
5409 | rcu_read_lock(); | |
5410 | ||
e0c7ec2b DG |
5411 | if (!app->compatible) { |
5412 | goto end; | |
5413 | } | |
5414 | ||
84cd17c6 | 5415 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 5416 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 5417 | if (node == NULL) { |
d42f20df DG |
5418 | /* Session is being or is deleted. */ |
5419 | goto end; | |
84cd17c6 MD |
5420 | } |
5421 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 5422 | |
840cb59c | 5423 | health_code_update(); |
d0b96690 | 5424 | destroy_app_session(app, ua_sess); |
84cd17c6 | 5425 | |
840cb59c | 5426 | health_code_update(); |
7db205b5 | 5427 | |
84cd17c6 | 5428 | /* Quiescent wait after stopping trace */ |
fb45065e | 5429 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 5430 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 5431 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
5432 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
5433 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
5434 | app->pid, ret); | |
5435 | } | |
e0c7ec2b DG |
5436 | end: |
5437 | rcu_read_unlock(); | |
840cb59c | 5438 | health_code_update(); |
84cd17c6 | 5439 | return 0; |
84cd17c6 MD |
5440 | } |
5441 | ||
5b4a0ec0 DG |
5442 | /* |
5443 | * Start tracing for the UST session. | |
5444 | */ | |
421cb601 DG |
5445 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
5446 | { | |
bec39940 | 5447 | struct lttng_ht_iter iter; |
421cb601 | 5448 | struct ust_app *app; |
48842b30 | 5449 | |
421cb601 DG |
5450 | DBG("Starting all UST traces"); |
5451 | ||
bb2452c8 MD |
5452 | /* |
5453 | * Even though the start trace might fail, flag this session active so | |
5454 | * other application coming in are started by default. | |
5455 | */ | |
5456 | usess->active = 1; | |
5457 | ||
421cb601 | 5458 | rcu_read_lock(); |
421cb601 | 5459 | |
0dd01979 MD |
5460 | /* |
5461 | * In a start-stop-start use-case, we need to clear the quiescent state | |
5462 | * of each channel set by the prior stop command, thus ensuring that a | |
5463 | * following stop or destroy is sure to grab a timestamp_end near those | |
5464 | * operations, even if the packet is empty. | |
5465 | */ | |
5466 | (void) ust_app_clear_quiescent_session(usess); | |
5467 | ||
0498a00c MD |
5468 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
5469 | ust_app_global_update(usess, app); | |
5470 | } | |
5471 | ||
48842b30 DG |
5472 | rcu_read_unlock(); |
5473 | ||
5474 | return 0; | |
5475 | } | |
487cf67c | 5476 | |
8be98f9a MD |
5477 | /* |
5478 | * Start tracing for the UST session. | |
ce34fcd0 | 5479 | * Called with UST session lock held. |
8be98f9a MD |
5480 | */ |
5481 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
5482 | { | |
5483 | int ret = 0; | |
bec39940 | 5484 | struct lttng_ht_iter iter; |
8be98f9a MD |
5485 | struct ust_app *app; |
5486 | ||
5487 | DBG("Stopping all UST traces"); | |
5488 | ||
bb2452c8 MD |
5489 | /* |
5490 | * Even though the stop trace might fail, flag this session inactive so | |
5491 | * other application coming in are not started by default. | |
5492 | */ | |
5493 | usess->active = 0; | |
5494 | ||
8be98f9a MD |
5495 | rcu_read_lock(); |
5496 | ||
b34cbebf MD |
5497 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
5498 | ret = ust_app_stop_trace(usess, app); | |
5499 | if (ret < 0) { | |
5500 | /* Continue to next apps even on error */ | |
5501 | continue; | |
5502 | } | |
5503 | } | |
5504 | ||
ce34fcd0 | 5505 | (void) ust_app_flush_session(usess); |
8be98f9a MD |
5506 | |
5507 | rcu_read_unlock(); | |
5508 | ||
5509 | return 0; | |
5510 | } | |
5511 | ||
84cd17c6 MD |
5512 | /* |
5513 | * Destroy app UST session. | |
5514 | */ | |
5515 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
5516 | { | |
5517 | int ret = 0; | |
bec39940 | 5518 | struct lttng_ht_iter iter; |
84cd17c6 MD |
5519 | struct ust_app *app; |
5520 | ||
5521 | DBG("Destroy all UST traces"); | |
5522 | ||
5523 | rcu_read_lock(); | |
5524 | ||
852d0037 | 5525 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 5526 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
5527 | if (ret < 0) { |
5528 | /* Continue to next apps even on error */ | |
5529 | continue; | |
5530 | } | |
5531 | } | |
5532 | ||
5533 | rcu_read_unlock(); | |
5534 | ||
5535 | return 0; | |
5536 | } | |
5537 | ||
88e3c2f5 | 5538 | /* The ua_sess lock must be held by the caller. */ |
a9ad0c8f | 5539 | static |
88e3c2f5 JG |
5540 | int find_or_create_ust_app_channel( |
5541 | struct ltt_ust_session *usess, | |
5542 | struct ust_app_session *ua_sess, | |
5543 | struct ust_app *app, | |
5544 | struct ltt_ust_channel *uchan, | |
5545 | struct ust_app_channel **ua_chan) | |
487cf67c | 5546 | { |
55c54cce | 5547 | int ret = 0; |
88e3c2f5 JG |
5548 | struct lttng_ht_iter iter; |
5549 | struct lttng_ht_node_str *ua_chan_node; | |
5550 | ||
5551 | lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &iter); | |
5552 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
5553 | if (ua_chan_node) { | |
5554 | *ua_chan = caa_container_of(ua_chan_node, | |
5555 | struct ust_app_channel, node); | |
5556 | goto end; | |
5557 | } | |
5558 | ||
5559 | ret = ust_app_channel_create(usess, ua_sess, uchan, app, ua_chan); | |
5560 | if (ret) { | |
5561 | goto end; | |
5562 | } | |
5563 | end: | |
5564 | return ret; | |
5565 | } | |
5566 | ||
5567 | static | |
5568 | int ust_app_channel_synchronize_event(struct ust_app_channel *ua_chan, | |
5569 | struct ltt_ust_event *uevent, struct ust_app_session *ua_sess, | |
5570 | struct ust_app *app) | |
5571 | { | |
5572 | int ret = 0; | |
5573 | struct ust_app_event *ua_event = NULL; | |
5574 | ||
5575 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
5576 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); | |
5577 | if (!ua_event) { | |
5578 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); | |
5579 | if (ret < 0) { | |
5580 | goto end; | |
5581 | } | |
5582 | } else { | |
5583 | if (ua_event->enabled != uevent->enabled) { | |
5584 | ret = uevent->enabled ? | |
5585 | enable_ust_app_event(ua_sess, ua_event, app) : | |
5586 | disable_ust_app_event(ua_sess, ua_event, app); | |
5587 | } | |
5588 | } | |
5589 | ||
5590 | end: | |
5591 | return ret; | |
5592 | } | |
5593 | ||
993578ff JR |
5594 | /* Called with RCU read-side lock held. */ |
5595 | static | |
5596 | void ust_app_synchronize_event_notifier_rules(struct ust_app *app) | |
5597 | { | |
5598 | int ret = 0; | |
5599 | enum lttng_error_code ret_code; | |
5600 | enum lttng_trigger_status t_status; | |
5601 | struct lttng_ht_iter app_trigger_iter; | |
5602 | struct lttng_triggers *triggers = NULL; | |
5603 | struct ust_app_event_notifier_rule *event_notifier_rule; | |
5604 | unsigned int count, i; | |
5605 | ||
5606 | /* | |
5607 | * Currrently, registering or unregistering a trigger with an | |
5608 | * event rule condition causes a full synchronization of the event | |
5609 | * notifiers. | |
5610 | * | |
5611 | * The first step attempts to add an event notifier for all registered | |
5612 | * triggers that apply to the user space tracers. Then, the | |
5613 | * application's event notifiers rules are all checked against the list | |
5614 | * of registered triggers. Any event notifier that doesn't have a | |
5615 | * matching trigger can be assumed to have been disabled. | |
5616 | * | |
5617 | * All of this is inefficient, but is put in place to get the feature | |
5618 | * rolling as it is simpler at this moment. It will be optimized Soon™ | |
5619 | * to allow the state of enabled | |
5620 | * event notifiers to be synchronized in a piece-wise way. | |
5621 | */ | |
5622 | ||
5623 | /* Get all triggers using uid 0 (root) */ | |
5624 | ret_code = notification_thread_command_list_triggers( | |
5625 | notification_thread_handle, 0, &triggers); | |
5626 | if (ret_code != LTTNG_OK) { | |
5627 | ret = -1; | |
5628 | goto end; | |
5629 | } | |
5630 | ||
5631 | assert(triggers); | |
5632 | ||
5633 | t_status = lttng_triggers_get_count(triggers, &count); | |
5634 | if (t_status != LTTNG_TRIGGER_STATUS_OK) { | |
5635 | ret = -1; | |
5636 | goto end; | |
5637 | } | |
5638 | ||
5639 | for (i = 0; i < count; i++) { | |
5640 | struct lttng_condition *condition; | |
5641 | struct lttng_event_rule *event_rule; | |
5642 | struct lttng_trigger *trigger; | |
5643 | const struct ust_app_event_notifier_rule *looked_up_event_notifier_rule; | |
5644 | enum lttng_condition_status condition_status; | |
5645 | uint64_t token; | |
5646 | ||
5647 | trigger = lttng_triggers_borrow_mutable_at_index(triggers, i); | |
5648 | assert(trigger); | |
5649 | ||
5650 | token = lttng_trigger_get_tracer_token(trigger); | |
5651 | condition = lttng_trigger_get_condition(trigger); | |
5652 | ||
d602bd6a | 5653 | if (lttng_condition_get_type(condition) != LTTNG_CONDITION_TYPE_ON_EVENT) { |
993578ff JR |
5654 | /* Does not apply */ |
5655 | continue; | |
5656 | } | |
5657 | ||
d602bd6a | 5658 | condition_status = lttng_condition_on_event_borrow_rule_mutable(condition, &event_rule); |
993578ff JR |
5659 | assert(condition_status == LTTNG_CONDITION_STATUS_OK); |
5660 | ||
5661 | if (lttng_event_rule_get_domain_type(event_rule) == LTTNG_DOMAIN_KERNEL) { | |
5662 | /* Skip kernel related triggers. */ | |
5663 | continue; | |
5664 | } | |
5665 | ||
5666 | /* | |
5667 | * Find or create the associated token event rule. The caller | |
5668 | * holds the RCU read lock, so this is safe to call without | |
5669 | * explicitly acquiring it here. | |
5670 | */ | |
5671 | looked_up_event_notifier_rule = find_ust_app_event_notifier_rule( | |
5672 | app->token_to_event_notifier_rule_ht, token); | |
5673 | if (!looked_up_event_notifier_rule) { | |
267d66aa | 5674 | ret = create_ust_app_event_notifier_rule(trigger, app); |
993578ff JR |
5675 | if (ret < 0) { |
5676 | goto end; | |
5677 | } | |
5678 | } | |
5679 | } | |
5680 | ||
5681 | rcu_read_lock(); | |
5682 | /* Remove all unknown event sources from the app. */ | |
5683 | cds_lfht_for_each_entry (app->token_to_event_notifier_rule_ht->ht, | |
5684 | &app_trigger_iter.iter, event_notifier_rule, | |
5685 | node.node) { | |
5686 | const uint64_t app_token = event_notifier_rule->token; | |
5687 | bool found = false; | |
5688 | ||
5689 | /* | |
5690 | * Check if the app event trigger still exists on the | |
5691 | * notification side. | |
5692 | */ | |
5693 | for (i = 0; i < count; i++) { | |
5694 | uint64_t notification_thread_token; | |
5695 | const struct lttng_trigger *trigger = | |
5696 | lttng_triggers_get_at_index( | |
5697 | triggers, i); | |
5698 | ||
5699 | assert(trigger); | |
5700 | ||
5701 | notification_thread_token = | |
5702 | lttng_trigger_get_tracer_token(trigger); | |
5703 | ||
5704 | if (notification_thread_token == app_token) { | |
5705 | found = true; | |
5706 | break; | |
5707 | } | |
5708 | } | |
5709 | ||
5710 | if (found) { | |
5711 | /* Still valid. */ | |
5712 | continue; | |
5713 | } | |
5714 | ||
5715 | /* | |
5716 | * This trigger was unregistered, disable it on the tracer's | |
5717 | * side. | |
5718 | */ | |
5719 | ret = lttng_ht_del(app->token_to_event_notifier_rule_ht, | |
5720 | &app_trigger_iter); | |
5721 | assert(ret == 0); | |
5722 | ||
5723 | /* Callee logs errors. */ | |
5724 | (void) disable_ust_object(app, event_notifier_rule->obj); | |
5725 | ||
5726 | delete_ust_app_event_notifier_rule( | |
5727 | app->sock, event_notifier_rule, app); | |
5728 | } | |
5729 | ||
5730 | rcu_read_unlock(); | |
5731 | ||
5732 | end: | |
5733 | lttng_triggers_destroy(triggers); | |
5734 | return; | |
5735 | } | |
5736 | ||
88e3c2f5 JG |
5737 | /* |
5738 | * The caller must ensure that the application is compatible and is tracked | |
2a3a1a2b | 5739 | * by the process attribute trackers. |
88e3c2f5 JG |
5740 | */ |
5741 | static | |
5742 | void ust_app_synchronize(struct ltt_ust_session *usess, | |
5743 | struct ust_app *app) | |
5744 | { | |
5745 | int ret = 0; | |
5746 | struct cds_lfht_iter uchan_iter; | |
5747 | struct ltt_ust_channel *uchan; | |
3d8ca23b | 5748 | struct ust_app_session *ua_sess = NULL; |
1f3580c7 | 5749 | |
88e3c2f5 JG |
5750 | /* |
5751 | * The application's configuration should only be synchronized for | |
5752 | * active sessions. | |
5753 | */ | |
5754 | assert(usess->active); | |
5755 | ||
5756 | ret = find_or_create_ust_app_session(usess, app, &ua_sess, NULL); | |
3d8ca23b DG |
5757 | if (ret < 0) { |
5758 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
5759 | goto error; |
5760 | } | |
3d8ca23b | 5761 | assert(ua_sess); |
487cf67c | 5762 | |
d0b96690 | 5763 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
5764 | if (ua_sess->deleted) { |
5765 | pthread_mutex_unlock(&ua_sess->lock); | |
5766 | goto end; | |
5767 | } | |
5768 | ||
88e3c2f5 | 5769 | rcu_read_lock(); |
ef67c072 | 5770 | |
88e3c2f5 JG |
5771 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &uchan_iter, |
5772 | uchan, node.node) { | |
5773 | struct ust_app_channel *ua_chan; | |
5774 | struct cds_lfht_iter uevent_iter; | |
5775 | struct ltt_ust_event *uevent; | |
487cf67c | 5776 | |
31746f93 | 5777 | /* |
88e3c2f5 JG |
5778 | * Search for a matching ust_app_channel. If none is found, |
5779 | * create it. Creating the channel will cause the ua_chan | |
5780 | * structure to be allocated, the channel buffers to be | |
5781 | * allocated (if necessary) and sent to the application, and | |
5782 | * all enabled contexts will be added to the channel. | |
31746f93 | 5783 | */ |
f3db82be | 5784 | ret = find_or_create_ust_app_channel(usess, ua_sess, |
88e3c2f5 JG |
5785 | app, uchan, &ua_chan); |
5786 | if (ret) { | |
5787 | /* Tracer is probably gone or ENOMEM. */ | |
5788 | goto error_unlock; | |
727d5404 DG |
5789 | } |
5790 | ||
88e3c2f5 JG |
5791 | if (!ua_chan) { |
5792 | /* ua_chan will be NULL for the metadata channel */ | |
5793 | continue; | |
5794 | } | |
727d5404 | 5795 | |
88e3c2f5 | 5796 | cds_lfht_for_each_entry(uchan->events->ht, &uevent_iter, uevent, |
bec39940 | 5797 | node.node) { |
88e3c2f5 JG |
5798 | ret = ust_app_channel_synchronize_event(ua_chan, |
5799 | uevent, ua_sess, app); | |
5800 | if (ret) { | |
d0b96690 | 5801 | goto error_unlock; |
487cf67c | 5802 | } |
36dc12cc | 5803 | } |
d0b96690 | 5804 | |
88e3c2f5 JG |
5805 | if (ua_chan->enabled != uchan->enabled) { |
5806 | ret = uchan->enabled ? | |
5807 | enable_ust_app_channel(ua_sess, uchan, app) : | |
5808 | disable_ust_app_channel(ua_sess, ua_chan, app); | |
5809 | if (ret) { | |
5810 | goto error_unlock; | |
5811 | } | |
5812 | } | |
36dc12cc | 5813 | } |
ef67c072 JG |
5814 | |
5815 | /* | |
5816 | * Create the metadata for the application. This returns gracefully if a | |
5817 | * metadata was already set for the session. | |
5818 | * | |
5819 | * The metadata channel must be created after the data channels as the | |
5820 | * consumer daemon assumes this ordering. When interacting with a relay | |
5821 | * daemon, the consumer will use this assumption to send the | |
5822 | * "STREAMS_SENT" message to the relay daemon. | |
5823 | */ | |
5824 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer); | |
5825 | if (ret < 0) { | |
5826 | goto error_unlock; | |
5827 | } | |
5828 | ||
88e3c2f5 | 5829 | rcu_read_unlock(); |
0498a00c | 5830 | |
a9ad0c8f | 5831 | end: |
88e3c2f5 | 5832 | pthread_mutex_unlock(&ua_sess->lock); |
ffe60014 | 5833 | /* Everything went well at this point. */ |
ffe60014 DG |
5834 | return; |
5835 | ||
d0b96690 | 5836 | error_unlock: |
88e3c2f5 | 5837 | rcu_read_unlock(); |
d0b96690 | 5838 | pthread_mutex_unlock(&ua_sess->lock); |
487cf67c | 5839 | error: |
ffe60014 | 5840 | if (ua_sess) { |
d0b96690 | 5841 | destroy_app_session(app, ua_sess); |
ffe60014 | 5842 | } |
487cf67c DG |
5843 | return; |
5844 | } | |
55cc08a6 | 5845 | |
a9ad0c8f MD |
5846 | static |
5847 | void ust_app_global_destroy(struct ltt_ust_session *usess, struct ust_app *app) | |
5848 | { | |
5849 | struct ust_app_session *ua_sess; | |
5850 | ||
5851 | ua_sess = lookup_session_by_app(usess, app); | |
5852 | if (ua_sess == NULL) { | |
5853 | return; | |
5854 | } | |
5855 | destroy_app_session(app, ua_sess); | |
5856 | } | |
5857 | ||
5858 | /* | |
5859 | * Add channels/events from UST global domain to registered apps at sock. | |
5860 | * | |
5861 | * Called with session lock held. | |
5862 | * Called with RCU read-side lock held. | |
5863 | */ | |
5864 | void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app) | |
5865 | { | |
5866 | assert(usess); | |
88e3c2f5 | 5867 | assert(usess->active); |
a9ad0c8f MD |
5868 | |
5869 | DBG2("UST app global update for app sock %d for session id %" PRIu64, | |
5870 | app->sock, usess->id); | |
5871 | ||
5872 | if (!app->compatible) { | |
5873 | return; | |
5874 | } | |
159b042f JG |
5875 | if (trace_ust_id_tracker_lookup(LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID, |
5876 | usess, app->pid) && | |
55c9e7ca | 5877 | trace_ust_id_tracker_lookup( |
159b042f JG |
5878 | LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID, |
5879 | usess, app->uid) && | |
55c9e7ca | 5880 | trace_ust_id_tracker_lookup( |
159b042f JG |
5881 | LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID, |
5882 | usess, app->gid)) { | |
88e3c2f5 JG |
5883 | /* |
5884 | * Synchronize the application's internal tracing configuration | |
5885 | * and start tracing. | |
5886 | */ | |
5887 | ust_app_synchronize(usess, app); | |
5888 | ust_app_start_trace(usess, app); | |
a9ad0c8f MD |
5889 | } else { |
5890 | ust_app_global_destroy(usess, app); | |
5891 | } | |
5892 | } | |
5893 | ||
993578ff JR |
5894 | /* |
5895 | * Add all event notifiers to an application. | |
5896 | * | |
5897 | * Called with session lock held. | |
5898 | * Called with RCU read-side lock held. | |
5899 | */ | |
5900 | void ust_app_global_update_event_notifier_rules(struct ust_app *app) | |
5901 | { | |
5902 | DBG2("UST application global event notifier rules update: app = '%s' (ppid: %d)", | |
5903 | app->name, app->ppid); | |
5904 | ||
5905 | if (!app->compatible) { | |
5906 | return; | |
5907 | } | |
5908 | ||
5909 | if (app->event_notifier_group.object == NULL) { | |
5910 | WARN("UST app global update of event notifiers for app skipped since communication handle is null: app = '%s' (ppid: %d)", | |
5911 | app->name, app->ppid); | |
5912 | return; | |
5913 | } | |
5914 | ||
5915 | ust_app_synchronize_event_notifier_rules(app); | |
5916 | } | |
5917 | ||
a9ad0c8f MD |
5918 | /* |
5919 | * Called with session lock held. | |
5920 | */ | |
5921 | void ust_app_global_update_all(struct ltt_ust_session *usess) | |
5922 | { | |
5923 | struct lttng_ht_iter iter; | |
5924 | struct ust_app *app; | |
5925 | ||
5926 | rcu_read_lock(); | |
5927 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5928 | ust_app_global_update(usess, app); | |
5929 | } | |
5930 | rcu_read_unlock(); | |
5931 | } | |
5932 | ||
993578ff JR |
5933 | void ust_app_global_update_all_event_notifier_rules(void) |
5934 | { | |
5935 | struct lttng_ht_iter iter; | |
5936 | struct ust_app *app; | |
5937 | ||
5938 | rcu_read_lock(); | |
5939 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5940 | ust_app_global_update_event_notifier_rules(app); | |
5941 | } | |
5942 | ||
5943 | rcu_read_unlock(); | |
5944 | } | |
5945 | ||
55cc08a6 DG |
5946 | /* |
5947 | * Add context to a specific channel for global UST domain. | |
5948 | */ | |
5949 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
5950 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
5951 | { | |
5952 | int ret = 0; | |
bec39940 DG |
5953 | struct lttng_ht_node_str *ua_chan_node; |
5954 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
5955 | struct ust_app_channel *ua_chan = NULL; |
5956 | struct ust_app_session *ua_sess; | |
5957 | struct ust_app *app; | |
5958 | ||
88e3c2f5 | 5959 | assert(usess->active); |
0498a00c | 5960 | |
55cc08a6 | 5961 | rcu_read_lock(); |
852d0037 | 5962 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
5963 | if (!app->compatible) { |
5964 | /* | |
5965 | * TODO: In time, we should notice the caller of this error by | |
5966 | * telling him that this is a version error. | |
5967 | */ | |
5968 | continue; | |
5969 | } | |
55cc08a6 DG |
5970 | ua_sess = lookup_session_by_app(usess, app); |
5971 | if (ua_sess == NULL) { | |
5972 | continue; | |
5973 | } | |
5974 | ||
d0b96690 | 5975 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
5976 | |
5977 | if (ua_sess->deleted) { | |
5978 | pthread_mutex_unlock(&ua_sess->lock); | |
5979 | continue; | |
5980 | } | |
5981 | ||
55cc08a6 | 5982 | /* Lookup channel in the ust app session */ |
bec39940 DG |
5983 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
5984 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 5985 | if (ua_chan_node == NULL) { |
d0b96690 | 5986 | goto next_app; |
55cc08a6 DG |
5987 | } |
5988 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
5989 | node); | |
c9edf082 | 5990 | ret = create_ust_app_channel_context(ua_chan, &uctx->ctx, app); |
55cc08a6 | 5991 | if (ret < 0) { |
d0b96690 | 5992 | goto next_app; |
55cc08a6 | 5993 | } |
d0b96690 DG |
5994 | next_app: |
5995 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
5996 | } |
5997 | ||
55cc08a6 | 5998 | rcu_read_unlock(); |
76d45b40 DG |
5999 | return ret; |
6000 | } | |
7f79d3a1 | 6001 | |
d0b96690 DG |
6002 | /* |
6003 | * Receive registration and populate the given msg structure. | |
6004 | * | |
6005 | * On success return 0 else a negative value returned by the ustctl call. | |
6006 | */ | |
6007 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
6008 | { | |
6009 | int ret; | |
6010 | uint32_t pid, ppid, uid, gid; | |
6011 | ||
6012 | assert(msg); | |
6013 | ||
6014 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
6015 | &pid, &ppid, &uid, &gid, | |
6016 | &msg->bits_per_long, | |
6017 | &msg->uint8_t_alignment, | |
6018 | &msg->uint16_t_alignment, | |
6019 | &msg->uint32_t_alignment, | |
6020 | &msg->uint64_t_alignment, | |
6021 | &msg->long_alignment, | |
6022 | &msg->byte_order, | |
6023 | msg->name); | |
6024 | if (ret < 0) { | |
6025 | switch (-ret) { | |
6026 | case EPIPE: | |
6027 | case ECONNRESET: | |
6028 | case LTTNG_UST_ERR_EXITING: | |
6029 | DBG3("UST app recv reg message failed. Application died"); | |
6030 | break; | |
6031 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
6032 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
6033 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
6034 | LTTNG_UST_ABI_MINOR_VERSION); | |
6035 | break; | |
6036 | default: | |
6037 | ERR("UST app recv reg message failed with ret %d", ret); | |
6038 | break; | |
6039 | } | |
6040 | goto error; | |
6041 | } | |
6042 | msg->pid = (pid_t) pid; | |
6043 | msg->ppid = (pid_t) ppid; | |
6044 | msg->uid = (uid_t) uid; | |
6045 | msg->gid = (gid_t) gid; | |
6046 | ||
6047 | error: | |
6048 | return ret; | |
6049 | } | |
6050 | ||
10b56aef MD |
6051 | /* |
6052 | * Return a ust app session object using the application object and the | |
6053 | * session object descriptor has a key. If not found, NULL is returned. | |
6054 | * A RCU read side lock MUST be acquired when calling this function. | |
6055 | */ | |
6056 | static struct ust_app_session *find_session_by_objd(struct ust_app *app, | |
6057 | int objd) | |
6058 | { | |
6059 | struct lttng_ht_node_ulong *node; | |
6060 | struct lttng_ht_iter iter; | |
6061 | struct ust_app_session *ua_sess = NULL; | |
6062 | ||
6063 | assert(app); | |
6064 | ||
6065 | lttng_ht_lookup(app->ust_sessions_objd, (void *)((unsigned long) objd), &iter); | |
6066 | node = lttng_ht_iter_get_node_ulong(&iter); | |
6067 | if (node == NULL) { | |
6068 | DBG2("UST app session find by objd %d not found", objd); | |
6069 | goto error; | |
6070 | } | |
6071 | ||
6072 | ua_sess = caa_container_of(node, struct ust_app_session, ust_objd_node); | |
6073 | ||
6074 | error: | |
6075 | return ua_sess; | |
6076 | } | |
6077 | ||
d88aee68 DG |
6078 | /* |
6079 | * Return a ust app channel object using the application object and the channel | |
6080 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
6081 | * lock MUST be acquired before calling this function. | |
6082 | */ | |
d0b96690 DG |
6083 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
6084 | int objd) | |
6085 | { | |
6086 | struct lttng_ht_node_ulong *node; | |
6087 | struct lttng_ht_iter iter; | |
6088 | struct ust_app_channel *ua_chan = NULL; | |
6089 | ||
6090 | assert(app); | |
6091 | ||
6092 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
6093 | node = lttng_ht_iter_get_node_ulong(&iter); | |
6094 | if (node == NULL) { | |
6095 | DBG2("UST app channel find by objd %d not found", objd); | |
6096 | goto error; | |
6097 | } | |
6098 | ||
6099 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
6100 | ||
6101 | error: | |
6102 | return ua_chan; | |
6103 | } | |
6104 | ||
d88aee68 DG |
6105 | /* |
6106 | * Reply to a register channel notification from an application on the notify | |
6107 | * socket. The channel metadata is also created. | |
6108 | * | |
6109 | * The session UST registry lock is acquired in this function. | |
6110 | * | |
6111 | * On success 0 is returned else a negative value. | |
6112 | */ | |
8eede835 | 6113 | static int reply_ust_register_channel(int sock, int cobjd, |
d0b96690 DG |
6114 | size_t nr_fields, struct ustctl_field *fields) |
6115 | { | |
6116 | int ret, ret_code = 0; | |
294e218e | 6117 | uint32_t chan_id; |
7972aab2 | 6118 | uint64_t chan_reg_key; |
d0b96690 DG |
6119 | enum ustctl_channel_header type; |
6120 | struct ust_app *app; | |
6121 | struct ust_app_channel *ua_chan; | |
6122 | struct ust_app_session *ua_sess; | |
7972aab2 | 6123 | struct ust_registry_session *registry; |
45893984 | 6124 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
6125 | |
6126 | rcu_read_lock(); | |
6127 | ||
6128 | /* Lookup application. If not found, there is a code flow error. */ | |
6129 | app = find_app_by_notify_sock(sock); | |
d88aee68 | 6130 | if (!app) { |
fad1ed2f | 6131 | DBG("Application socket %d is being torn down. Abort event notify", |
d88aee68 DG |
6132 | sock); |
6133 | ret = 0; | |
6134 | goto error_rcu_unlock; | |
6135 | } | |
d0b96690 | 6136 | |
4950b860 | 6137 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 6138 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 | 6139 | if (!ua_chan) { |
fad1ed2f | 6140 | DBG("Application channel is being torn down. Abort event notify"); |
4950b860 MD |
6141 | ret = 0; |
6142 | goto error_rcu_unlock; | |
6143 | } | |
6144 | ||
d0b96690 DG |
6145 | assert(ua_chan->session); |
6146 | ua_sess = ua_chan->session; | |
d0b96690 | 6147 | |
7972aab2 DG |
6148 | /* Get right session registry depending on the session buffer type. */ |
6149 | registry = get_session_registry(ua_sess); | |
fad1ed2f JR |
6150 | if (!registry) { |
6151 | DBG("Application session is being torn down. Abort event notify"); | |
6152 | ret = 0; | |
6153 | goto error_rcu_unlock; | |
6154 | }; | |
45893984 | 6155 | |
7972aab2 DG |
6156 | /* Depending on the buffer type, a different channel key is used. */ |
6157 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
6158 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 6159 | } else { |
7972aab2 | 6160 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
6161 | } |
6162 | ||
7972aab2 DG |
6163 | pthread_mutex_lock(®istry->lock); |
6164 | ||
6165 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
6166 | assert(chan_reg); | |
6167 | ||
6168 | if (!chan_reg->register_done) { | |
294e218e MD |
6169 | /* |
6170 | * TODO: eventually use the registry event count for | |
6171 | * this channel to better guess header type for per-pid | |
6172 | * buffers. | |
6173 | */ | |
6174 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
7972aab2 DG |
6175 | chan_reg->nr_ctx_fields = nr_fields; |
6176 | chan_reg->ctx_fields = fields; | |
fad1ed2f | 6177 | fields = NULL; |
7972aab2 | 6178 | chan_reg->header_type = type; |
d0b96690 | 6179 | } else { |
7972aab2 DG |
6180 | /* Get current already assigned values. */ |
6181 | type = chan_reg->header_type; | |
d0b96690 | 6182 | } |
7972aab2 DG |
6183 | /* Channel id is set during the object creation. */ |
6184 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
6185 | |
6186 | /* Append to metadata */ | |
7972aab2 DG |
6187 | if (!chan_reg->metadata_dumped) { |
6188 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
6189 | if (ret_code) { |
6190 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
6191 | goto reply; | |
6192 | } | |
6193 | } | |
6194 | ||
6195 | reply: | |
7972aab2 DG |
6196 | DBG3("UST app replying to register channel key %" PRIu64 |
6197 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
6198 | ret_code); | |
d0b96690 DG |
6199 | |
6200 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
6201 | if (ret < 0) { | |
6202 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6203 | ERR("UST app reply channel failed with ret %d", ret); | |
6204 | } else { | |
6205 | DBG3("UST app reply channel failed. Application died"); | |
6206 | } | |
6207 | goto error; | |
6208 | } | |
6209 | ||
7972aab2 DG |
6210 | /* This channel registry registration is completed. */ |
6211 | chan_reg->register_done = 1; | |
6212 | ||
d0b96690 | 6213 | error: |
7972aab2 | 6214 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 6215 | error_rcu_unlock: |
d0b96690 | 6216 | rcu_read_unlock(); |
fad1ed2f | 6217 | free(fields); |
d0b96690 DG |
6218 | return ret; |
6219 | } | |
6220 | ||
d88aee68 DG |
6221 | /* |
6222 | * Add event to the UST channel registry. When the event is added to the | |
6223 | * registry, the metadata is also created. Once done, this replies to the | |
6224 | * application with the appropriate error code. | |
6225 | * | |
6226 | * The session UST registry lock is acquired in the function. | |
6227 | * | |
6228 | * On success 0 is returned else a negative value. | |
6229 | */ | |
d0b96690 | 6230 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
2106efa0 PP |
6231 | char *sig, size_t nr_fields, struct ustctl_field *fields, |
6232 | int loglevel_value, char *model_emf_uri) | |
d0b96690 DG |
6233 | { |
6234 | int ret, ret_code; | |
6235 | uint32_t event_id = 0; | |
7972aab2 | 6236 | uint64_t chan_reg_key; |
d0b96690 DG |
6237 | struct ust_app *app; |
6238 | struct ust_app_channel *ua_chan; | |
6239 | struct ust_app_session *ua_sess; | |
7972aab2 | 6240 | struct ust_registry_session *registry; |
d0b96690 DG |
6241 | |
6242 | rcu_read_lock(); | |
6243 | ||
6244 | /* Lookup application. If not found, there is a code flow error. */ | |
6245 | app = find_app_by_notify_sock(sock); | |
d88aee68 | 6246 | if (!app) { |
fad1ed2f | 6247 | DBG("Application socket %d is being torn down. Abort event notify", |
d88aee68 DG |
6248 | sock); |
6249 | ret = 0; | |
6250 | goto error_rcu_unlock; | |
6251 | } | |
d0b96690 | 6252 | |
4950b860 | 6253 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 6254 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 | 6255 | if (!ua_chan) { |
fad1ed2f | 6256 | DBG("Application channel is being torn down. Abort event notify"); |
4950b860 MD |
6257 | ret = 0; |
6258 | goto error_rcu_unlock; | |
6259 | } | |
6260 | ||
d0b96690 DG |
6261 | assert(ua_chan->session); |
6262 | ua_sess = ua_chan->session; | |
6263 | ||
7972aab2 | 6264 | registry = get_session_registry(ua_sess); |
fad1ed2f JR |
6265 | if (!registry) { |
6266 | DBG("Application session is being torn down. Abort event notify"); | |
6267 | ret = 0; | |
6268 | goto error_rcu_unlock; | |
6269 | } | |
7972aab2 DG |
6270 | |
6271 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
6272 | chan_reg_key = ua_chan->tracing_channel_id; | |
6273 | } else { | |
6274 | chan_reg_key = ua_chan->key; | |
6275 | } | |
6276 | ||
6277 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 6278 | |
d5d629b5 DG |
6279 | /* |
6280 | * From this point on, this call acquires the ownership of the sig, fields | |
6281 | * and model_emf_uri meaning any free are done inside it if needed. These | |
6282 | * three variables MUST NOT be read/write after this. | |
6283 | */ | |
7972aab2 | 6284 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
2106efa0 PP |
6285 | sobjd, cobjd, name, sig, nr_fields, fields, |
6286 | loglevel_value, model_emf_uri, ua_sess->buffer_type, | |
6287 | &event_id, app); | |
fad1ed2f JR |
6288 | sig = NULL; |
6289 | fields = NULL; | |
6290 | model_emf_uri = NULL; | |
d0b96690 DG |
6291 | |
6292 | /* | |
6293 | * The return value is returned to ustctl so in case of an error, the | |
6294 | * application can be notified. In case of an error, it's important not to | |
6295 | * return a negative error or else the application will get closed. | |
6296 | */ | |
6297 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
6298 | if (ret < 0) { | |
6299 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6300 | ERR("UST app reply event failed with ret %d", ret); | |
6301 | } else { | |
6302 | DBG3("UST app reply event failed. Application died"); | |
6303 | } | |
6304 | /* | |
6305 | * No need to wipe the create event since the application socket will | |
6306 | * get close on error hence cleaning up everything by itself. | |
6307 | */ | |
6308 | goto error; | |
6309 | } | |
6310 | ||
7972aab2 DG |
6311 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
6312 | name, event_id); | |
d88aee68 | 6313 | |
d0b96690 | 6314 | error: |
7972aab2 | 6315 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 6316 | error_rcu_unlock: |
d0b96690 | 6317 | rcu_read_unlock(); |
fad1ed2f JR |
6318 | free(sig); |
6319 | free(fields); | |
6320 | free(model_emf_uri); | |
d0b96690 DG |
6321 | return ret; |
6322 | } | |
6323 | ||
10b56aef MD |
6324 | /* |
6325 | * Add enum to the UST session registry. Once done, this replies to the | |
6326 | * application with the appropriate error code. | |
6327 | * | |
6328 | * The session UST registry lock is acquired within this function. | |
6329 | * | |
6330 | * On success 0 is returned else a negative value. | |
6331 | */ | |
6332 | static int add_enum_ust_registry(int sock, int sobjd, char *name, | |
6333 | struct ustctl_enum_entry *entries, size_t nr_entries) | |
6334 | { | |
6335 | int ret = 0, ret_code; | |
6336 | struct ust_app *app; | |
6337 | struct ust_app_session *ua_sess; | |
6338 | struct ust_registry_session *registry; | |
6339 | uint64_t enum_id = -1ULL; | |
6340 | ||
6341 | rcu_read_lock(); | |
6342 | ||
6343 | /* Lookup application. If not found, there is a code flow error. */ | |
6344 | app = find_app_by_notify_sock(sock); | |
6345 | if (!app) { | |
6346 | /* Return an error since this is not an error */ | |
6347 | DBG("Application socket %d is being torn down. Aborting enum registration", | |
6348 | sock); | |
6349 | free(entries); | |
6350 | goto error_rcu_unlock; | |
6351 | } | |
6352 | ||
6353 | /* Lookup session by UST object descriptor. */ | |
6354 | ua_sess = find_session_by_objd(app, sobjd); | |
6355 | if (!ua_sess) { | |
6356 | /* Return an error since this is not an error */ | |
fad1ed2f | 6357 | DBG("Application session is being torn down (session not found). Aborting enum registration."); |
10b56aef MD |
6358 | free(entries); |
6359 | goto error_rcu_unlock; | |
6360 | } | |
6361 | ||
6362 | registry = get_session_registry(ua_sess); | |
fad1ed2f JR |
6363 | if (!registry) { |
6364 | DBG("Application session is being torn down (registry not found). Aborting enum registration."); | |
6365 | free(entries); | |
6366 | goto error_rcu_unlock; | |
6367 | } | |
10b56aef MD |
6368 | |
6369 | pthread_mutex_lock(®istry->lock); | |
6370 | ||
6371 | /* | |
6372 | * From this point on, the callee acquires the ownership of | |
6373 | * entries. The variable entries MUST NOT be read/written after | |
6374 | * call. | |
6375 | */ | |
6376 | ret_code = ust_registry_create_or_find_enum(registry, sobjd, name, | |
6377 | entries, nr_entries, &enum_id); | |
6378 | entries = NULL; | |
6379 | ||
6380 | /* | |
6381 | * The return value is returned to ustctl so in case of an error, the | |
6382 | * application can be notified. In case of an error, it's important not to | |
6383 | * return a negative error or else the application will get closed. | |
6384 | */ | |
6385 | ret = ustctl_reply_register_enum(sock, enum_id, ret_code); | |
6386 | if (ret < 0) { | |
6387 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6388 | ERR("UST app reply enum failed with ret %d", ret); | |
6389 | } else { | |
6390 | DBG3("UST app reply enum failed. Application died"); | |
6391 | } | |
6392 | /* | |
6393 | * No need to wipe the create enum since the application socket will | |
6394 | * get close on error hence cleaning up everything by itself. | |
6395 | */ | |
6396 | goto error; | |
6397 | } | |
6398 | ||
6399 | DBG3("UST registry enum %s added successfully or already found", name); | |
6400 | ||
6401 | error: | |
6402 | pthread_mutex_unlock(®istry->lock); | |
6403 | error_rcu_unlock: | |
6404 | rcu_read_unlock(); | |
6405 | return ret; | |
6406 | } | |
6407 | ||
d88aee68 DG |
6408 | /* |
6409 | * Handle application notification through the given notify socket. | |
6410 | * | |
6411 | * Return 0 on success or else a negative value. | |
6412 | */ | |
d0b96690 DG |
6413 | int ust_app_recv_notify(int sock) |
6414 | { | |
6415 | int ret; | |
6416 | enum ustctl_notify_cmd cmd; | |
6417 | ||
6418 | DBG3("UST app receiving notify from sock %d", sock); | |
6419 | ||
6420 | ret = ustctl_recv_notify(sock, &cmd); | |
6421 | if (ret < 0) { | |
6422 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6423 | ERR("UST app recv notify failed with ret %d", ret); | |
6424 | } else { | |
6425 | DBG3("UST app recv notify failed. Application died"); | |
6426 | } | |
6427 | goto error; | |
6428 | } | |
6429 | ||
6430 | switch (cmd) { | |
6431 | case USTCTL_NOTIFY_CMD_EVENT: | |
6432 | { | |
2106efa0 | 6433 | int sobjd, cobjd, loglevel_value; |
fc4b93fa | 6434 | char name[LTTNG_UST_ABI_SYM_NAME_LEN], *sig, *model_emf_uri; |
d0b96690 DG |
6435 | size_t nr_fields; |
6436 | struct ustctl_field *fields; | |
6437 | ||
6438 | DBG2("UST app ustctl register event received"); | |
6439 | ||
2106efa0 PP |
6440 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, |
6441 | &loglevel_value, &sig, &nr_fields, &fields, | |
6442 | &model_emf_uri); | |
d0b96690 DG |
6443 | if (ret < 0) { |
6444 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6445 | ERR("UST app recv event failed with ret %d", ret); | |
6446 | } else { | |
6447 | DBG3("UST app recv event failed. Application died"); | |
6448 | } | |
6449 | goto error; | |
6450 | } | |
6451 | ||
d5d629b5 DG |
6452 | /* |
6453 | * Add event to the UST registry coming from the notify socket. This | |
6454 | * call will free if needed the sig, fields and model_emf_uri. This | |
6455 | * code path loses the ownsership of these variables and transfer them | |
6456 | * to the this function. | |
6457 | */ | |
d0b96690 | 6458 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
2106efa0 | 6459 | fields, loglevel_value, model_emf_uri); |
d0b96690 DG |
6460 | if (ret < 0) { |
6461 | goto error; | |
6462 | } | |
6463 | ||
6464 | break; | |
6465 | } | |
6466 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
6467 | { | |
6468 | int sobjd, cobjd; | |
6469 | size_t nr_fields; | |
6470 | struct ustctl_field *fields; | |
6471 | ||
6472 | DBG2("UST app ustctl register channel received"); | |
6473 | ||
6474 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
6475 | &fields); | |
6476 | if (ret < 0) { | |
6477 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6478 | ERR("UST app recv channel failed with ret %d", ret); | |
6479 | } else { | |
6480 | DBG3("UST app recv channel failed. Application died"); | |
6481 | } | |
6482 | goto error; | |
6483 | } | |
6484 | ||
d5d629b5 DG |
6485 | /* |
6486 | * The fields ownership are transfered to this function call meaning | |
6487 | * that if needed it will be freed. After this, it's invalid to access | |
6488 | * fields or clean it up. | |
6489 | */ | |
8eede835 | 6490 | ret = reply_ust_register_channel(sock, cobjd, nr_fields, |
d0b96690 DG |
6491 | fields); |
6492 | if (ret < 0) { | |
6493 | goto error; | |
6494 | } | |
6495 | ||
6496 | break; | |
6497 | } | |
10b56aef MD |
6498 | case USTCTL_NOTIFY_CMD_ENUM: |
6499 | { | |
6500 | int sobjd; | |
fc4b93fa | 6501 | char name[LTTNG_UST_ABI_SYM_NAME_LEN]; |
10b56aef MD |
6502 | size_t nr_entries; |
6503 | struct ustctl_enum_entry *entries; | |
6504 | ||
6505 | DBG2("UST app ustctl register enum received"); | |
6506 | ||
6507 | ret = ustctl_recv_register_enum(sock, &sobjd, name, | |
6508 | &entries, &nr_entries); | |
6509 | if (ret < 0) { | |
6510 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6511 | ERR("UST app recv enum failed with ret %d", ret); | |
6512 | } else { | |
6513 | DBG3("UST app recv enum failed. Application died"); | |
6514 | } | |
6515 | goto error; | |
6516 | } | |
6517 | ||
6518 | /* Callee assumes ownership of entries */ | |
6519 | ret = add_enum_ust_registry(sock, sobjd, name, | |
6520 | entries, nr_entries); | |
6521 | if (ret < 0) { | |
6522 | goto error; | |
6523 | } | |
6524 | ||
6525 | break; | |
6526 | } | |
d0b96690 DG |
6527 | default: |
6528 | /* Should NEVER happen. */ | |
6529 | assert(0); | |
6530 | } | |
6531 | ||
6532 | error: | |
6533 | return ret; | |
6534 | } | |
d88aee68 DG |
6535 | |
6536 | /* | |
6537 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
6538 | * corresponding application. On failure, the call_rcu to close the socket is | |
6539 | * executed. If an application is found, it tries to delete it from the notify | |
6540 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
6541 | * | |
6542 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
6543 | * call RCU is not done but the rest of the cleanup is. | |
6544 | */ | |
6545 | void ust_app_notify_sock_unregister(int sock) | |
6546 | { | |
6547 | int err_enomem = 0; | |
6548 | struct lttng_ht_iter iter; | |
6549 | struct ust_app *app; | |
6550 | struct ust_app_notify_sock_obj *obj; | |
6551 | ||
6552 | assert(sock >= 0); | |
6553 | ||
6554 | rcu_read_lock(); | |
6555 | ||
6556 | obj = zmalloc(sizeof(*obj)); | |
6557 | if (!obj) { | |
6558 | /* | |
6559 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
6560 | * procedure but the call_rcu will not be called. In this case, we | |
6561 | * accept the fd leak rather than possibly creating an unsynchronized | |
6562 | * state between threads. | |
6563 | * | |
6564 | * TODO: The notify object should be created once the notify socket is | |
6565 | * registered and stored independantely from the ust app object. The | |
6566 | * tricky part is to synchronize the teardown of the application and | |
6567 | * this notify object. Let's keep that in mind so we can avoid this | |
6568 | * kind of shenanigans with ENOMEM in the teardown path. | |
6569 | */ | |
6570 | err_enomem = 1; | |
6571 | } else { | |
6572 | obj->fd = sock; | |
6573 | } | |
6574 | ||
6575 | DBG("UST app notify socket unregister %d", sock); | |
6576 | ||
6577 | /* | |
6578 | * Lookup application by notify socket. If this fails, this means that the | |
6579 | * hash table delete has already been done by the application | |
6580 | * unregistration process so we can safely close the notify socket in a | |
6581 | * call RCU. | |
6582 | */ | |
6583 | app = find_app_by_notify_sock(sock); | |
6584 | if (!app) { | |
6585 | goto close_socket; | |
6586 | } | |
6587 | ||
6588 | iter.iter.node = &app->notify_sock_n.node; | |
6589 | ||
6590 | /* | |
6591 | * Whatever happens here either we fail or succeed, in both cases we have | |
6592 | * to close the socket after a grace period to continue to the call RCU | |
6593 | * here. If the deletion is successful, the application is not visible | |
6594 | * anymore by other threads and is it fails it means that it was already | |
6595 | * deleted from the hash table so either way we just have to close the | |
6596 | * socket. | |
6597 | */ | |
6598 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
6599 | ||
6600 | close_socket: | |
6601 | rcu_read_unlock(); | |
6602 | ||
6603 | /* | |
6604 | * Close socket after a grace period to avoid for the socket to be reused | |
6605 | * before the application object is freed creating potential race between | |
6606 | * threads trying to add unique in the global hash table. | |
6607 | */ | |
6608 | if (!err_enomem) { | |
6609 | call_rcu(&obj->head, close_notify_sock_rcu); | |
6610 | } | |
6611 | } | |
f45e313d DG |
6612 | |
6613 | /* | |
6614 | * Destroy a ust app data structure and free its memory. | |
6615 | */ | |
6616 | void ust_app_destroy(struct ust_app *app) | |
6617 | { | |
6618 | if (!app) { | |
6619 | return; | |
6620 | } | |
6621 | ||
6622 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
6623 | } | |
6dc3064a DG |
6624 | |
6625 | /* | |
6626 | * Take a snapshot for a given UST session. The snapshot is sent to the given | |
6627 | * output. | |
6628 | * | |
9a654598 | 6629 | * Returns LTTNG_OK on success or a LTTNG_ERR error code. |
6dc3064a | 6630 | */ |
fb9a95c4 JG |
6631 | enum lttng_error_code ust_app_snapshot_record( |
6632 | const struct ltt_ust_session *usess, | |
348a81dc | 6633 | const struct consumer_output *output, int wait, |
d07ceecd | 6634 | uint64_t nb_packets_per_stream) |
6dc3064a DG |
6635 | { |
6636 | int ret = 0; | |
9a654598 | 6637 | enum lttng_error_code status = LTTNG_OK; |
6dc3064a DG |
6638 | struct lttng_ht_iter iter; |
6639 | struct ust_app *app; | |
affce97e | 6640 | char *trace_path = NULL; |
6dc3064a DG |
6641 | |
6642 | assert(usess); | |
6643 | assert(output); | |
6644 | ||
6645 | rcu_read_lock(); | |
6646 | ||
8c924c7b MD |
6647 | switch (usess->buffer_type) { |
6648 | case LTTNG_BUFFER_PER_UID: | |
6649 | { | |
6650 | struct buffer_reg_uid *reg; | |
6dc3064a | 6651 | |
8c924c7b MD |
6652 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
6653 | struct buffer_reg_channel *reg_chan; | |
6654 | struct consumer_socket *socket; | |
3b967712 | 6655 | char pathname[PATH_MAX]; |
5da88b0f | 6656 | size_t consumer_path_offset = 0; |
6dc3064a | 6657 | |
2b269489 JR |
6658 | if (!reg->registry->reg.ust->metadata_key) { |
6659 | /* Skip since no metadata is present */ | |
6660 | continue; | |
6661 | } | |
6662 | ||
8c924c7b MD |
6663 | /* Get consumer socket to use to push the metadata.*/ |
6664 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
6665 | usess->consumer); | |
6666 | if (!socket) { | |
9a654598 | 6667 | status = LTTNG_ERR_INVALID; |
8c924c7b MD |
6668 | goto error; |
6669 | } | |
6dc3064a | 6670 | |
8c924c7b MD |
6671 | memset(pathname, 0, sizeof(pathname)); |
6672 | ret = snprintf(pathname, sizeof(pathname), | |
5da88b0f | 6673 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH, |
8c924c7b MD |
6674 | reg->uid, reg->bits_per_long); |
6675 | if (ret < 0) { | |
6676 | PERROR("snprintf snapshot path"); | |
9a654598 | 6677 | status = LTTNG_ERR_INVALID; |
8c924c7b MD |
6678 | goto error; |
6679 | } | |
affce97e JG |
6680 | /* Free path allowed on previous iteration. */ |
6681 | free(trace_path); | |
5da88b0f MD |
6682 | trace_path = setup_channel_trace_path(usess->consumer, pathname, |
6683 | &consumer_path_offset); | |
3b967712 MD |
6684 | if (!trace_path) { |
6685 | status = LTTNG_ERR_INVALID; | |
6686 | goto error; | |
6687 | } | |
f3db82be | 6688 | /* Add the UST default trace dir to path. */ |
8c924c7b MD |
6689 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
6690 | reg_chan, node.node) { | |
9a654598 | 6691 | status = consumer_snapshot_channel(socket, |
e098433c JG |
6692 | reg_chan->consumer_key, |
6693 | output, 0, usess->uid, | |
5da88b0f | 6694 | usess->gid, &trace_path[consumer_path_offset], wait, |
d2956687 | 6695 | nb_packets_per_stream); |
9a654598 | 6696 | if (status != LTTNG_OK) { |
8c924c7b MD |
6697 | goto error; |
6698 | } | |
6699 | } | |
9a654598 | 6700 | status = consumer_snapshot_channel(socket, |
68808f4e | 6701 | reg->registry->reg.ust->metadata_key, output, 1, |
5da88b0f MD |
6702 | usess->uid, usess->gid, &trace_path[consumer_path_offset], |
6703 | wait, 0); | |
9a654598 | 6704 | if (status != LTTNG_OK) { |
8c924c7b MD |
6705 | goto error; |
6706 | } | |
af706bb7 | 6707 | } |
8c924c7b MD |
6708 | break; |
6709 | } | |
6710 | case LTTNG_BUFFER_PER_PID: | |
6711 | { | |
6712 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6713 | struct consumer_socket *socket; | |
6714 | struct lttng_ht_iter chan_iter; | |
6715 | struct ust_app_channel *ua_chan; | |
6716 | struct ust_app_session *ua_sess; | |
6717 | struct ust_registry_session *registry; | |
3b967712 | 6718 | char pathname[PATH_MAX]; |
5da88b0f | 6719 | size_t consumer_path_offset = 0; |
8c924c7b MD |
6720 | |
6721 | ua_sess = lookup_session_by_app(usess, app); | |
6722 | if (!ua_sess) { | |
6723 | /* Session not associated with this app. */ | |
6724 | continue; | |
6725 | } | |
af706bb7 | 6726 | |
8c924c7b MD |
6727 | /* Get the right consumer socket for the application. */ |
6728 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
348a81dc | 6729 | output); |
8c924c7b | 6730 | if (!socket) { |
9a654598 | 6731 | status = LTTNG_ERR_INVALID; |
5c786ded JD |
6732 | goto error; |
6733 | } | |
6734 | ||
8c924c7b MD |
6735 | /* Add the UST default trace dir to path. */ |
6736 | memset(pathname, 0, sizeof(pathname)); | |
5da88b0f | 6737 | ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "/%s", |
8c924c7b | 6738 | ua_sess->path); |
6dc3064a | 6739 | if (ret < 0) { |
9a654598 | 6740 | status = LTTNG_ERR_INVALID; |
8c924c7b | 6741 | PERROR("snprintf snapshot path"); |
6dc3064a DG |
6742 | goto error; |
6743 | } | |
affce97e JG |
6744 | /* Free path allowed on previous iteration. */ |
6745 | free(trace_path); | |
5da88b0f MD |
6746 | trace_path = setup_channel_trace_path(usess->consumer, pathname, |
6747 | &consumer_path_offset); | |
3b967712 MD |
6748 | if (!trace_path) { |
6749 | status = LTTNG_ERR_INVALID; | |
6750 | goto error; | |
6751 | } | |
f3db82be | 6752 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, |
8c924c7b | 6753 | ua_chan, node.node) { |
9a654598 | 6754 | status = consumer_snapshot_channel(socket, |
470cc211 | 6755 | ua_chan->key, output, 0, |
ff588497 JR |
6756 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
6757 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
5da88b0f | 6758 | &trace_path[consumer_path_offset], wait, |
d2956687 | 6759 | nb_packets_per_stream); |
9a654598 JG |
6760 | switch (status) { |
6761 | case LTTNG_OK: | |
6762 | break; | |
6763 | case LTTNG_ERR_CHAN_NOT_FOUND: | |
6764 | continue; | |
6765 | default: | |
8c924c7b MD |
6766 | goto error; |
6767 | } | |
6768 | } | |
6769 | ||
6770 | registry = get_session_registry(ua_sess); | |
fad1ed2f | 6771 | if (!registry) { |
9bbfb88c MD |
6772 | DBG("Application session is being torn down. Skip application."); |
6773 | continue; | |
fad1ed2f | 6774 | } |
9a654598 | 6775 | status = consumer_snapshot_channel(socket, |
470cc211 | 6776 | registry->metadata_key, output, 1, |
ff588497 JR |
6777 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
6778 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
5da88b0f | 6779 | &trace_path[consumer_path_offset], wait, 0); |
9a654598 JG |
6780 | switch (status) { |
6781 | case LTTNG_OK: | |
6782 | break; | |
6783 | case LTTNG_ERR_CHAN_NOT_FOUND: | |
6784 | continue; | |
6785 | default: | |
8c924c7b MD |
6786 | goto error; |
6787 | } | |
6788 | } | |
6789 | break; | |
6790 | } | |
6791 | default: | |
6792 | assert(0); | |
6793 | break; | |
6dc3064a DG |
6794 | } |
6795 | ||
6796 | error: | |
affce97e | 6797 | free(trace_path); |
6dc3064a | 6798 | rcu_read_unlock(); |
9a654598 | 6799 | return status; |
6dc3064a | 6800 | } |
5c786ded JD |
6801 | |
6802 | /* | |
d07ceecd | 6803 | * Return the size taken by one more packet per stream. |
5c786ded | 6804 | */ |
fb9a95c4 JG |
6805 | uint64_t ust_app_get_size_one_more_packet_per_stream( |
6806 | const struct ltt_ust_session *usess, uint64_t cur_nr_packets) | |
5c786ded | 6807 | { |
d07ceecd | 6808 | uint64_t tot_size = 0; |
5c786ded JD |
6809 | struct ust_app *app; |
6810 | struct lttng_ht_iter iter; | |
6811 | ||
6812 | assert(usess); | |
6813 | ||
6814 | switch (usess->buffer_type) { | |
6815 | case LTTNG_BUFFER_PER_UID: | |
6816 | { | |
6817 | struct buffer_reg_uid *reg; | |
6818 | ||
6819 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
6820 | struct buffer_reg_channel *reg_chan; | |
6821 | ||
b7064eaa | 6822 | rcu_read_lock(); |
5c786ded JD |
6823 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
6824 | reg_chan, node.node) { | |
d07ceecd MD |
6825 | if (cur_nr_packets >= reg_chan->num_subbuf) { |
6826 | /* | |
6827 | * Don't take channel into account if we | |
6828 | * already grab all its packets. | |
6829 | */ | |
6830 | continue; | |
6831 | } | |
6832 | tot_size += reg_chan->subbuf_size * reg_chan->stream_count; | |
5c786ded | 6833 | } |
b7064eaa | 6834 | rcu_read_unlock(); |
5c786ded JD |
6835 | } |
6836 | break; | |
6837 | } | |
6838 | case LTTNG_BUFFER_PER_PID: | |
6839 | { | |
6840 | rcu_read_lock(); | |
6841 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6842 | struct ust_app_channel *ua_chan; | |
6843 | struct ust_app_session *ua_sess; | |
6844 | struct lttng_ht_iter chan_iter; | |
6845 | ||
6846 | ua_sess = lookup_session_by_app(usess, app); | |
6847 | if (!ua_sess) { | |
6848 | /* Session not associated with this app. */ | |
6849 | continue; | |
6850 | } | |
6851 | ||
6852 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
6853 | ua_chan, node.node) { | |
d07ceecd MD |
6854 | if (cur_nr_packets >= ua_chan->attr.num_subbuf) { |
6855 | /* | |
6856 | * Don't take channel into account if we | |
6857 | * already grab all its packets. | |
6858 | */ | |
6859 | continue; | |
6860 | } | |
6861 | tot_size += ua_chan->attr.subbuf_size * ua_chan->streams.count; | |
5c786ded JD |
6862 | } |
6863 | } | |
6864 | rcu_read_unlock(); | |
6865 | break; | |
6866 | } | |
6867 | default: | |
6868 | assert(0); | |
6869 | break; | |
6870 | } | |
6871 | ||
d07ceecd | 6872 | return tot_size; |
5c786ded | 6873 | } |
fb83fe64 JD |
6874 | |
6875 | int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id, | |
6876 | struct cds_list_head *buffer_reg_uid_list, | |
6877 | struct consumer_output *consumer, uint64_t uchan_id, | |
6878 | int overwrite, uint64_t *discarded, uint64_t *lost) | |
6879 | { | |
6880 | int ret; | |
6881 | uint64_t consumer_chan_key; | |
6882 | ||
70dd8162 MD |
6883 | *discarded = 0; |
6884 | *lost = 0; | |
6885 | ||
fb83fe64 | 6886 | ret = buffer_reg_uid_consumer_channel_key( |
76604852 | 6887 | buffer_reg_uid_list, uchan_id, &consumer_chan_key); |
fb83fe64 | 6888 | if (ret < 0) { |
70dd8162 MD |
6889 | /* Not found */ |
6890 | ret = 0; | |
fb83fe64 JD |
6891 | goto end; |
6892 | } | |
6893 | ||
6894 | if (overwrite) { | |
6895 | ret = consumer_get_lost_packets(ust_session_id, | |
6896 | consumer_chan_key, consumer, lost); | |
6897 | } else { | |
6898 | ret = consumer_get_discarded_events(ust_session_id, | |
6899 | consumer_chan_key, consumer, discarded); | |
6900 | } | |
6901 | ||
6902 | end: | |
6903 | return ret; | |
6904 | } | |
6905 | ||
6906 | int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess, | |
6907 | struct ltt_ust_channel *uchan, | |
6908 | struct consumer_output *consumer, int overwrite, | |
6909 | uint64_t *discarded, uint64_t *lost) | |
6910 | { | |
6911 | int ret = 0; | |
6912 | struct lttng_ht_iter iter; | |
6913 | struct lttng_ht_node_str *ua_chan_node; | |
6914 | struct ust_app *app; | |
6915 | struct ust_app_session *ua_sess; | |
6916 | struct ust_app_channel *ua_chan; | |
6917 | ||
70dd8162 MD |
6918 | *discarded = 0; |
6919 | *lost = 0; | |
6920 | ||
fb83fe64 JD |
6921 | rcu_read_lock(); |
6922 | /* | |
70dd8162 MD |
6923 | * Iterate over every registered applications. Sum counters for |
6924 | * all applications containing requested session and channel. | |
fb83fe64 JD |
6925 | */ |
6926 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6927 | struct lttng_ht_iter uiter; | |
6928 | ||
6929 | ua_sess = lookup_session_by_app(usess, app); | |
6930 | if (ua_sess == NULL) { | |
6931 | continue; | |
6932 | } | |
6933 | ||
6934 | /* Get channel */ | |
ee022399 | 6935 | lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &uiter); |
fb83fe64 JD |
6936 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); |
6937 | /* If the session is found for the app, the channel must be there */ | |
6938 | assert(ua_chan_node); | |
6939 | ||
6940 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
6941 | ||
6942 | if (overwrite) { | |
70dd8162 MD |
6943 | uint64_t _lost; |
6944 | ||
fb83fe64 | 6945 | ret = consumer_get_lost_packets(usess->id, ua_chan->key, |
70dd8162 MD |
6946 | consumer, &_lost); |
6947 | if (ret < 0) { | |
6948 | break; | |
6949 | } | |
6950 | (*lost) += _lost; | |
fb83fe64 | 6951 | } else { |
70dd8162 MD |
6952 | uint64_t _discarded; |
6953 | ||
fb83fe64 | 6954 | ret = consumer_get_discarded_events(usess->id, |
70dd8162 MD |
6955 | ua_chan->key, consumer, &_discarded); |
6956 | if (ret < 0) { | |
6957 | break; | |
6958 | } | |
6959 | (*discarded) += _discarded; | |
fb83fe64 | 6960 | } |
fb83fe64 JD |
6961 | } |
6962 | ||
fb83fe64 JD |
6963 | rcu_read_unlock(); |
6964 | return ret; | |
6965 | } | |
c2561365 JD |
6966 | |
6967 | static | |
6968 | int ust_app_regenerate_statedump(struct ltt_ust_session *usess, | |
6969 | struct ust_app *app) | |
6970 | { | |
6971 | int ret = 0; | |
6972 | struct ust_app_session *ua_sess; | |
6973 | ||
6974 | DBG("Regenerating the metadata for ust app pid %d", app->pid); | |
6975 | ||
6976 | rcu_read_lock(); | |
6977 | ||
6978 | ua_sess = lookup_session_by_app(usess, app); | |
6979 | if (ua_sess == NULL) { | |
6980 | /* The session is in teardown process. Ignore and continue. */ | |
6981 | goto end; | |
6982 | } | |
6983 | ||
6984 | pthread_mutex_lock(&ua_sess->lock); | |
6985 | ||
6986 | if (ua_sess->deleted) { | |
6987 | goto end_unlock; | |
6988 | } | |
6989 | ||
6990 | pthread_mutex_lock(&app->sock_lock); | |
6991 | ret = ustctl_regenerate_statedump(app->sock, ua_sess->handle); | |
6992 | pthread_mutex_unlock(&app->sock_lock); | |
6993 | ||
6994 | end_unlock: | |
6995 | pthread_mutex_unlock(&ua_sess->lock); | |
6996 | ||
6997 | end: | |
6998 | rcu_read_unlock(); | |
6999 | health_code_update(); | |
7000 | return ret; | |
7001 | } | |
7002 | ||
7003 | /* | |
7004 | * Regenerate the statedump for each app in the session. | |
7005 | */ | |
7006 | int ust_app_regenerate_statedump_all(struct ltt_ust_session *usess) | |
7007 | { | |
7008 | int ret = 0; | |
7009 | struct lttng_ht_iter iter; | |
7010 | struct ust_app *app; | |
7011 | ||
7012 | DBG("Regenerating the metadata for all UST apps"); | |
7013 | ||
7014 | rcu_read_lock(); | |
7015 | ||
7016 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
7017 | if (!app->compatible) { | |
7018 | continue; | |
7019 | } | |
7020 | ||
7021 | ret = ust_app_regenerate_statedump(usess, app); | |
7022 | if (ret < 0) { | |
7023 | /* Continue to the next app even on error */ | |
7024 | continue; | |
7025 | } | |
7026 | } | |
7027 | ||
7028 | rcu_read_unlock(); | |
7029 | ||
7030 | return 0; | |
7031 | } | |
5c408ad8 JD |
7032 | |
7033 | /* | |
7034 | * Rotate all the channels of a session. | |
7035 | * | |
6f6d3b69 | 7036 | * Return LTTNG_OK on success or else an LTTng error code. |
5c408ad8 | 7037 | */ |
6f6d3b69 | 7038 | enum lttng_error_code ust_app_rotate_session(struct ltt_session *session) |
5c408ad8 | 7039 | { |
6f6d3b69 MD |
7040 | int ret; |
7041 | enum lttng_error_code cmd_ret = LTTNG_OK; | |
5c408ad8 JD |
7042 | struct lttng_ht_iter iter; |
7043 | struct ust_app *app; | |
7044 | struct ltt_ust_session *usess = session->ust_session; | |
5c408ad8 JD |
7045 | |
7046 | assert(usess); | |
7047 | ||
7048 | rcu_read_lock(); | |
7049 | ||
7050 | switch (usess->buffer_type) { | |
7051 | case LTTNG_BUFFER_PER_UID: | |
7052 | { | |
7053 | struct buffer_reg_uid *reg; | |
7054 | ||
7055 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
7056 | struct buffer_reg_channel *reg_chan; | |
7057 | struct consumer_socket *socket; | |
7058 | ||
14d3fca9 JR |
7059 | if (!reg->registry->reg.ust->metadata_key) { |
7060 | /* Skip since no metadata is present */ | |
7061 | continue; | |
7062 | } | |
7063 | ||
5c408ad8 JD |
7064 | /* Get consumer socket to use to push the metadata.*/ |
7065 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
7066 | usess->consumer); | |
7067 | if (!socket) { | |
6f6d3b69 | 7068 | cmd_ret = LTTNG_ERR_INVALID; |
5c408ad8 JD |
7069 | goto error; |
7070 | } | |
7071 | ||
5c408ad8 JD |
7072 | /* Rotate the data channels. */ |
7073 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
7074 | reg_chan, node.node) { | |
5c408ad8 JD |
7075 | ret = consumer_rotate_channel(socket, |
7076 | reg_chan->consumer_key, | |
7077 | usess->uid, usess->gid, | |
d2956687 JG |
7078 | usess->consumer, |
7079 | /* is_metadata_channel */ false); | |
5c408ad8 | 7080 | if (ret < 0) { |
6f6d3b69 | 7081 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
7082 | goto error; |
7083 | } | |
7084 | } | |
7085 | ||
7086 | (void) push_metadata(reg->registry->reg.ust, usess->consumer); | |
7087 | ||
7088 | ret = consumer_rotate_channel(socket, | |
7089 | reg->registry->reg.ust->metadata_key, | |
7090 | usess->uid, usess->gid, | |
d2956687 JG |
7091 | usess->consumer, |
7092 | /* is_metadata_channel */ true); | |
5c408ad8 | 7093 | if (ret < 0) { |
6f6d3b69 | 7094 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
7095 | goto error; |
7096 | } | |
5c408ad8 JD |
7097 | } |
7098 | break; | |
7099 | } | |
7100 | case LTTNG_BUFFER_PER_PID: | |
7101 | { | |
7102 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
7103 | struct consumer_socket *socket; | |
7104 | struct lttng_ht_iter chan_iter; | |
7105 | struct ust_app_channel *ua_chan; | |
7106 | struct ust_app_session *ua_sess; | |
7107 | struct ust_registry_session *registry; | |
7108 | ||
7109 | ua_sess = lookup_session_by_app(usess, app); | |
7110 | if (!ua_sess) { | |
7111 | /* Session not associated with this app. */ | |
7112 | continue; | |
7113 | } | |
5c408ad8 JD |
7114 | |
7115 | /* Get the right consumer socket for the application. */ | |
7116 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
7117 | usess->consumer); | |
7118 | if (!socket) { | |
6f6d3b69 | 7119 | cmd_ret = LTTNG_ERR_INVALID; |
5c408ad8 JD |
7120 | goto error; |
7121 | } | |
7122 | ||
7123 | registry = get_session_registry(ua_sess); | |
7124 | if (!registry) { | |
6f6d3b69 MD |
7125 | DBG("Application session is being torn down. Skip application."); |
7126 | continue; | |
5c408ad8 JD |
7127 | } |
7128 | ||
5c408ad8 JD |
7129 | /* Rotate the data channels. */ |
7130 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
7131 | ua_chan, node.node) { | |
470cc211 JG |
7132 | ret = consumer_rotate_channel(socket, |
7133 | ua_chan->key, | |
ff588497 JR |
7134 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
7135 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
d2956687 JG |
7136 | ua_sess->consumer, |
7137 | /* is_metadata_channel */ false); | |
5c408ad8 | 7138 | if (ret < 0) { |
6f6d3b69 MD |
7139 | /* Per-PID buffer and application going away. */ |
7140 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) | |
7141 | continue; | |
7142 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; | |
5c408ad8 JD |
7143 | goto error; |
7144 | } | |
7145 | } | |
7146 | ||
7147 | /* Rotate the metadata channel. */ | |
7148 | (void) push_metadata(registry, usess->consumer); | |
470cc211 JG |
7149 | ret = consumer_rotate_channel(socket, |
7150 | registry->metadata_key, | |
ff588497 JR |
7151 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
7152 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
d2956687 JG |
7153 | ua_sess->consumer, |
7154 | /* is_metadata_channel */ true); | |
5c408ad8 | 7155 | if (ret < 0) { |
6f6d3b69 MD |
7156 | /* Per-PID buffer and application going away. */ |
7157 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) | |
7158 | continue; | |
7159 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; | |
5c408ad8 JD |
7160 | goto error; |
7161 | } | |
5c408ad8 JD |
7162 | } |
7163 | break; | |
7164 | } | |
7165 | default: | |
7166 | assert(0); | |
7167 | break; | |
7168 | } | |
7169 | ||
6f6d3b69 | 7170 | cmd_ret = LTTNG_OK; |
5c408ad8 JD |
7171 | |
7172 | error: | |
7173 | rcu_read_unlock(); | |
6f6d3b69 | 7174 | return cmd_ret; |
5c408ad8 | 7175 | } |
d2956687 JG |
7176 | |
7177 | enum lttng_error_code ust_app_create_channel_subdirectories( | |
7178 | const struct ltt_ust_session *usess) | |
7179 | { | |
7180 | enum lttng_error_code ret = LTTNG_OK; | |
7181 | struct lttng_ht_iter iter; | |
7182 | enum lttng_trace_chunk_status chunk_status; | |
7183 | char *pathname_index; | |
7184 | int fmt_ret; | |
7185 | ||
7186 | assert(usess->current_trace_chunk); | |
7187 | rcu_read_lock(); | |
7188 | ||
7189 | switch (usess->buffer_type) { | |
7190 | case LTTNG_BUFFER_PER_UID: | |
7191 | { | |
7192 | struct buffer_reg_uid *reg; | |
7193 | ||
7194 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
7195 | fmt_ret = asprintf(&pathname_index, | |
5da88b0f | 7196 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH "/" DEFAULT_INDEX_DIR, |
d2956687 JG |
7197 | reg->uid, reg->bits_per_long); |
7198 | if (fmt_ret < 0) { | |
7199 | ERR("Failed to format channel index directory"); | |
7200 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
7201 | goto error; | |
7202 | } | |
7203 | ||
7204 | /* | |
7205 | * Create the index subdirectory which will take care | |
7206 | * of implicitly creating the channel's path. | |
7207 | */ | |
7208 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
7209 | usess->current_trace_chunk, | |
7210 | pathname_index); | |
7211 | free(pathname_index); | |
7212 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
7213 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
7214 | goto error; | |
7215 | } | |
7216 | } | |
7217 | break; | |
7218 | } | |
7219 | case LTTNG_BUFFER_PER_PID: | |
7220 | { | |
7221 | struct ust_app *app; | |
7222 | ||
495dece5 MD |
7223 | /* |
7224 | * Create the toplevel ust/ directory in case no apps are running. | |
7225 | */ | |
7226 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
7227 | usess->current_trace_chunk, | |
7228 | DEFAULT_UST_TRACE_DIR); | |
7229 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
7230 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
7231 | goto error; | |
7232 | } | |
7233 | ||
d2956687 JG |
7234 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, |
7235 | pid_n.node) { | |
7236 | struct ust_app_session *ua_sess; | |
7237 | struct ust_registry_session *registry; | |
7238 | ||
7239 | ua_sess = lookup_session_by_app(usess, app); | |
7240 | if (!ua_sess) { | |
7241 | /* Session not associated with this app. */ | |
7242 | continue; | |
7243 | } | |
7244 | ||
7245 | registry = get_session_registry(ua_sess); | |
7246 | if (!registry) { | |
7247 | DBG("Application session is being torn down. Skip application."); | |
7248 | continue; | |
7249 | } | |
7250 | ||
7251 | fmt_ret = asprintf(&pathname_index, | |
5da88b0f | 7252 | DEFAULT_UST_TRACE_DIR "/%s/" DEFAULT_INDEX_DIR, |
d2956687 JG |
7253 | ua_sess->path); |
7254 | if (fmt_ret < 0) { | |
7255 | ERR("Failed to format channel index directory"); | |
7256 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
7257 | goto error; | |
7258 | } | |
7259 | /* | |
7260 | * Create the index subdirectory which will take care | |
7261 | * of implicitly creating the channel's path. | |
7262 | */ | |
7263 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
7264 | usess->current_trace_chunk, | |
7265 | pathname_index); | |
7266 | free(pathname_index); | |
7267 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
7268 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
7269 | goto error; | |
7270 | } | |
7271 | } | |
7272 | break; | |
7273 | } | |
7274 | default: | |
7275 | abort(); | |
7276 | } | |
7277 | ||
7278 | ret = LTTNG_OK; | |
7279 | error: | |
7280 | rcu_read_unlock(); | |
7281 | return ret; | |
7282 | } | |
4a9b9759 MD |
7283 | |
7284 | /* | |
7285 | * Clear all the channels of a session. | |
7286 | * | |
7287 | * Return LTTNG_OK on success or else an LTTng error code. | |
7288 | */ | |
7289 | enum lttng_error_code ust_app_clear_session(struct ltt_session *session) | |
7290 | { | |
7291 | int ret; | |
7292 | enum lttng_error_code cmd_ret = LTTNG_OK; | |
7293 | struct lttng_ht_iter iter; | |
7294 | struct ust_app *app; | |
7295 | struct ltt_ust_session *usess = session->ust_session; | |
7296 | ||
7297 | assert(usess); | |
7298 | ||
7299 | rcu_read_lock(); | |
7300 | ||
7301 | if (usess->active) { | |
7302 | ERR("Expecting inactive session %s (%" PRIu64 ")", session->name, session->id); | |
7303 | cmd_ret = LTTNG_ERR_FATAL; | |
7304 | goto end; | |
7305 | } | |
7306 | ||
7307 | switch (usess->buffer_type) { | |
7308 | case LTTNG_BUFFER_PER_UID: | |
7309 | { | |
7310 | struct buffer_reg_uid *reg; | |
7311 | ||
7312 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
7313 | struct buffer_reg_channel *reg_chan; | |
7314 | struct consumer_socket *socket; | |
7315 | ||
7316 | /* Get consumer socket to use to push the metadata.*/ | |
7317 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
7318 | usess->consumer); | |
7319 | if (!socket) { | |
7320 | cmd_ret = LTTNG_ERR_INVALID; | |
7321 | goto error_socket; | |
7322 | } | |
7323 | ||
7324 | /* Clear the data channels. */ | |
7325 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
7326 | reg_chan, node.node) { | |
7327 | ret = consumer_clear_channel(socket, | |
7328 | reg_chan->consumer_key); | |
7329 | if (ret < 0) { | |
7330 | goto error; | |
7331 | } | |
7332 | } | |
7333 | ||
7334 | (void) push_metadata(reg->registry->reg.ust, usess->consumer); | |
7335 | ||
7336 | /* | |
7337 | * Clear the metadata channel. | |
7338 | * Metadata channel is not cleared per se but we still need to | |
7339 | * perform a rotation operation on it behind the scene. | |
7340 | */ | |
7341 | ret = consumer_clear_channel(socket, | |
7342 | reg->registry->reg.ust->metadata_key); | |
7343 | if (ret < 0) { | |
7344 | goto error; | |
7345 | } | |
7346 | } | |
7347 | break; | |
7348 | } | |
7349 | case LTTNG_BUFFER_PER_PID: | |
7350 | { | |
7351 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
7352 | struct consumer_socket *socket; | |
7353 | struct lttng_ht_iter chan_iter; | |
7354 | struct ust_app_channel *ua_chan; | |
7355 | struct ust_app_session *ua_sess; | |
7356 | struct ust_registry_session *registry; | |
7357 | ||
7358 | ua_sess = lookup_session_by_app(usess, app); | |
7359 | if (!ua_sess) { | |
7360 | /* Session not associated with this app. */ | |
7361 | continue; | |
7362 | } | |
7363 | ||
7364 | /* Get the right consumer socket for the application. */ | |
7365 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
7366 | usess->consumer); | |
7367 | if (!socket) { | |
7368 | cmd_ret = LTTNG_ERR_INVALID; | |
7369 | goto error_socket; | |
7370 | } | |
7371 | ||
7372 | registry = get_session_registry(ua_sess); | |
7373 | if (!registry) { | |
7374 | DBG("Application session is being torn down. Skip application."); | |
7375 | continue; | |
7376 | } | |
7377 | ||
7378 | /* Clear the data channels. */ | |
7379 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
7380 | ua_chan, node.node) { | |
7381 | ret = consumer_clear_channel(socket, ua_chan->key); | |
7382 | if (ret < 0) { | |
7383 | /* Per-PID buffer and application going away. */ | |
7384 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) { | |
7385 | continue; | |
7386 | } | |
7387 | goto error; | |
7388 | } | |
7389 | } | |
7390 | ||
7391 | (void) push_metadata(registry, usess->consumer); | |
7392 | ||
7393 | /* | |
7394 | * Clear the metadata channel. | |
7395 | * Metadata channel is not cleared per se but we still need to | |
7396 | * perform rotation operation on it behind the scene. | |
7397 | */ | |
7398 | ret = consumer_clear_channel(socket, registry->metadata_key); | |
7399 | if (ret < 0) { | |
7400 | /* Per-PID buffer and application going away. */ | |
7401 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) { | |
7402 | continue; | |
7403 | } | |
7404 | goto error; | |
7405 | } | |
7406 | } | |
7407 | break; | |
7408 | } | |
7409 | default: | |
7410 | assert(0); | |
7411 | break; | |
7412 | } | |
7413 | ||
7414 | cmd_ret = LTTNG_OK; | |
7415 | goto end; | |
7416 | ||
7417 | error: | |
7418 | switch (-ret) { | |
7419 | case LTTCOMM_CONSUMERD_RELAYD_CLEAR_DISALLOWED: | |
7420 | cmd_ret = LTTNG_ERR_CLEAR_RELAY_DISALLOWED; | |
7421 | break; | |
7422 | default: | |
7423 | cmd_ret = LTTNG_ERR_CLEAR_FAIL_CONSUMER; | |
7424 | } | |
7425 | ||
7426 | error_socket: | |
7427 | end: | |
7428 | rcu_read_unlock(); | |
7429 | return cmd_ret; | |
7430 | } | |
04ed9e10 JG |
7431 | |
7432 | /* | |
7433 | * This function skips the metadata channel as the begin/end timestamps of a | |
7434 | * metadata packet are useless. | |
7435 | * | |
7436 | * Moreover, opening a packet after a "clear" will cause problems for live | |
7437 | * sessions as it will introduce padding that was not part of the first trace | |
7438 | * chunk. The relay daemon expects the content of the metadata stream of | |
7439 | * successive metadata trace chunks to be strict supersets of one another. | |
7440 | * | |
7441 | * For example, flushing a packet at the beginning of the metadata stream of | |
7442 | * a trace chunk resulting from a "clear" session command will cause the | |
7443 | * size of the metadata stream of the new trace chunk to not match the size of | |
7444 | * the metadata stream of the original chunk. This will confuse the relay | |
7445 | * daemon as the same "offset" in a metadata stream will no longer point | |
7446 | * to the same content. | |
7447 | */ | |
7448 | enum lttng_error_code ust_app_open_packets(struct ltt_session *session) | |
7449 | { | |
7450 | enum lttng_error_code ret = LTTNG_OK; | |
7451 | struct lttng_ht_iter iter; | |
7452 | struct ltt_ust_session *usess = session->ust_session; | |
7453 | ||
7454 | assert(usess); | |
7455 | ||
7456 | rcu_read_lock(); | |
7457 | ||
7458 | switch (usess->buffer_type) { | |
7459 | case LTTNG_BUFFER_PER_UID: | |
7460 | { | |
7461 | struct buffer_reg_uid *reg; | |
7462 | ||
7463 | cds_list_for_each_entry ( | |
7464 | reg, &usess->buffer_reg_uid_list, lnode) { | |
7465 | struct buffer_reg_channel *reg_chan; | |
7466 | struct consumer_socket *socket; | |
7467 | ||
7468 | socket = consumer_find_socket_by_bitness( | |
7469 | reg->bits_per_long, usess->consumer); | |
7470 | if (!socket) { | |
7471 | ret = LTTNG_ERR_FATAL; | |
7472 | goto error; | |
7473 | } | |
7474 | ||
7475 | cds_lfht_for_each_entry(reg->registry->channels->ht, | |
7476 | &iter.iter, reg_chan, node.node) { | |
7477 | const int open_ret = | |
7478 | consumer_open_channel_packets( | |
7479 | socket, | |
7480 | reg_chan->consumer_key); | |
7481 | ||
7482 | if (open_ret < 0) { | |
7483 | ret = LTTNG_ERR_UNK; | |
7484 | goto error; | |
7485 | } | |
7486 | } | |
7487 | } | |
7488 | break; | |
7489 | } | |
7490 | case LTTNG_BUFFER_PER_PID: | |
7491 | { | |
7492 | struct ust_app *app; | |
7493 | ||
7494 | cds_lfht_for_each_entry ( | |
7495 | ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
7496 | struct consumer_socket *socket; | |
7497 | struct lttng_ht_iter chan_iter; | |
7498 | struct ust_app_channel *ua_chan; | |
7499 | struct ust_app_session *ua_sess; | |
7500 | struct ust_registry_session *registry; | |
7501 | ||
7502 | ua_sess = lookup_session_by_app(usess, app); | |
7503 | if (!ua_sess) { | |
7504 | /* Session not associated with this app. */ | |
7505 | continue; | |
7506 | } | |
7507 | ||
7508 | /* Get the right consumer socket for the application. */ | |
7509 | socket = consumer_find_socket_by_bitness( | |
7510 | app->bits_per_long, usess->consumer); | |
7511 | if (!socket) { | |
7512 | ret = LTTNG_ERR_FATAL; | |
7513 | goto error; | |
7514 | } | |
7515 | ||
7516 | registry = get_session_registry(ua_sess); | |
7517 | if (!registry) { | |
7518 | DBG("Application session is being torn down. Skip application."); | |
7519 | continue; | |
7520 | } | |
7521 | ||
7522 | cds_lfht_for_each_entry(ua_sess->channels->ht, | |
7523 | &chan_iter.iter, ua_chan, node.node) { | |
7524 | const int open_ret = | |
7525 | consumer_open_channel_packets( | |
7526 | socket, | |
7527 | ua_chan->key); | |
7528 | ||
7529 | if (open_ret < 0) { | |
7530 | /* | |
7531 | * Per-PID buffer and application going | |
7532 | * away. | |
7533 | */ | |
97a171e1 | 7534 | if (open_ret == -LTTNG_ERR_CHAN_NOT_FOUND) { |
04ed9e10 JG |
7535 | continue; |
7536 | } | |
7537 | ||
7538 | ret = LTTNG_ERR_UNK; | |
7539 | goto error; | |
7540 | } | |
7541 | } | |
7542 | } | |
7543 | break; | |
7544 | } | |
7545 | default: | |
7546 | abort(); | |
7547 | break; | |
7548 | } | |
7549 | ||
7550 | error: | |
7551 | rcu_read_unlock(); | |
7552 | return ret; | |
7553 | } |