Commit | Line | Data |
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91d76f53 DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
bdf64013 | 3 | * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
91d76f53 | 4 | * |
d14d33bf AM |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
91d76f53 DG |
8 | * |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
d14d33bf AM |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
91d76f53 DG |
17 | */ |
18 | ||
6c1c0768 | 19 | #define _LGPL_SOURCE |
91d76f53 | 20 | #include <errno.h> |
7972aab2 | 21 | #include <inttypes.h> |
91d76f53 DG |
22 | #include <pthread.h> |
23 | #include <stdio.h> | |
24 | #include <stdlib.h> | |
099e26bd | 25 | #include <string.h> |
aba8e916 DG |
26 | #include <sys/stat.h> |
27 | #include <sys/types.h> | |
099e26bd | 28 | #include <unistd.h> |
0df502fd | 29 | #include <urcu/compiler.h> |
331744e3 | 30 | #include <signal.h> |
bec39940 | 31 | |
990570ed | 32 | #include <common/common.h> |
86acf0da | 33 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 34 | |
7972aab2 | 35 | #include "buffer-registry.h" |
86acf0da | 36 | #include "fd-limit.h" |
8782cc74 | 37 | #include "health-sessiond.h" |
56fff090 | 38 | #include "ust-app.h" |
48842b30 | 39 | #include "ust-consumer.h" |
75018ab6 JG |
40 | #include "lttng-ust-ctl.h" |
41 | #include "lttng-ust-error.h" | |
0b2dc8df | 42 | #include "utils.h" |
fb83fe64 | 43 | #include "session.h" |
e9404c27 JG |
44 | #include "lttng-sessiond.h" |
45 | #include "notification-thread-commands.h" | |
5c408ad8 | 46 | #include "rotate.h" |
d80a6244 | 47 | |
44cdb3a2 MJ |
48 | struct lttng_ht *ust_app_ht; |
49 | struct lttng_ht *ust_app_ht_by_sock; | |
50 | struct lttng_ht *ust_app_ht_by_notify_sock; | |
51 | ||
c4b88406 MD |
52 | static |
53 | int ust_app_flush_app_session(struct ust_app *app, struct ust_app_session *ua_sess); | |
54 | ||
d9bf3ca4 MD |
55 | /* Next available channel key. Access under next_channel_key_lock. */ |
56 | static uint64_t _next_channel_key; | |
57 | static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER; | |
58 | ||
59 | /* Next available session ID. Access under next_session_id_lock. */ | |
60 | static uint64_t _next_session_id; | |
61 | static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER; | |
ffe60014 DG |
62 | |
63 | /* | |
d9bf3ca4 | 64 | * Return the incremented value of next_channel_key. |
ffe60014 | 65 | */ |
d9bf3ca4 | 66 | static uint64_t get_next_channel_key(void) |
ffe60014 | 67 | { |
d9bf3ca4 MD |
68 | uint64_t ret; |
69 | ||
70 | pthread_mutex_lock(&next_channel_key_lock); | |
71 | ret = ++_next_channel_key; | |
72 | pthread_mutex_unlock(&next_channel_key_lock); | |
73 | return ret; | |
ffe60014 DG |
74 | } |
75 | ||
76 | /* | |
7972aab2 | 77 | * Return the atomically incremented value of next_session_id. |
ffe60014 | 78 | */ |
d9bf3ca4 | 79 | static uint64_t get_next_session_id(void) |
ffe60014 | 80 | { |
d9bf3ca4 MD |
81 | uint64_t ret; |
82 | ||
83 | pthread_mutex_lock(&next_session_id_lock); | |
84 | ret = ++_next_session_id; | |
85 | pthread_mutex_unlock(&next_session_id_lock); | |
86 | return ret; | |
ffe60014 DG |
87 | } |
88 | ||
d65d2de8 DG |
89 | static void copy_channel_attr_to_ustctl( |
90 | struct ustctl_consumer_channel_attr *attr, | |
91 | struct lttng_ust_channel_attr *uattr) | |
92 | { | |
93 | /* Copy event attributes since the layout is different. */ | |
94 | attr->subbuf_size = uattr->subbuf_size; | |
95 | attr->num_subbuf = uattr->num_subbuf; | |
96 | attr->overwrite = uattr->overwrite; | |
97 | attr->switch_timer_interval = uattr->switch_timer_interval; | |
98 | attr->read_timer_interval = uattr->read_timer_interval; | |
99 | attr->output = uattr->output; | |
491d1539 | 100 | attr->blocking_timeout = uattr->u.s.blocking_timeout; |
d65d2de8 DG |
101 | } |
102 | ||
025faf73 DG |
103 | /* |
104 | * Match function for the hash table lookup. | |
105 | * | |
106 | * It matches an ust app event based on three attributes which are the event | |
107 | * name, the filter bytecode and the loglevel. | |
108 | */ | |
18eace3b DG |
109 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
110 | { | |
111 | struct ust_app_event *event; | |
112 | const struct ust_app_ht_key *key; | |
2106efa0 | 113 | int ev_loglevel_value; |
18eace3b DG |
114 | |
115 | assert(node); | |
116 | assert(_key); | |
117 | ||
118 | event = caa_container_of(node, struct ust_app_event, node.node); | |
119 | key = _key; | |
2106efa0 | 120 | ev_loglevel_value = event->attr.loglevel; |
18eace3b | 121 | |
1af53eb5 | 122 | /* Match the 4 elements of the key: name, filter, loglevel, exclusions */ |
18eace3b DG |
123 | |
124 | /* Event name */ | |
125 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
126 | goto no_match; | |
127 | } | |
128 | ||
129 | /* Event loglevel. */ | |
2106efa0 | 130 | if (ev_loglevel_value != key->loglevel_type) { |
025faf73 | 131 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
2106efa0 PP |
132 | && key->loglevel_type == 0 && |
133 | ev_loglevel_value == -1) { | |
025faf73 DG |
134 | /* |
135 | * Match is accepted. This is because on event creation, the | |
136 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
137 | * -1 are accepted for this loglevel type since 0 is the one set by | |
138 | * the API when receiving an enable event. | |
139 | */ | |
140 | } else { | |
141 | goto no_match; | |
142 | } | |
18eace3b DG |
143 | } |
144 | ||
145 | /* One of the filters is NULL, fail. */ | |
146 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
147 | goto no_match; | |
148 | } | |
149 | ||
025faf73 DG |
150 | if (key->filter && event->filter) { |
151 | /* Both filters exists, check length followed by the bytecode. */ | |
152 | if (event->filter->len != key->filter->len || | |
153 | memcmp(event->filter->data, key->filter->data, | |
154 | event->filter->len) != 0) { | |
155 | goto no_match; | |
156 | } | |
18eace3b DG |
157 | } |
158 | ||
1af53eb5 JI |
159 | /* One of the exclusions is NULL, fail. */ |
160 | if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) { | |
161 | goto no_match; | |
162 | } | |
163 | ||
164 | if (key->exclusion && event->exclusion) { | |
165 | /* Both exclusions exists, check count followed by the names. */ | |
166 | if (event->exclusion->count != key->exclusion->count || | |
167 | memcmp(event->exclusion->names, key->exclusion->names, | |
168 | event->exclusion->count * LTTNG_UST_SYM_NAME_LEN) != 0) { | |
169 | goto no_match; | |
170 | } | |
171 | } | |
172 | ||
173 | ||
025faf73 | 174 | /* Match. */ |
18eace3b DG |
175 | return 1; |
176 | ||
177 | no_match: | |
178 | return 0; | |
18eace3b DG |
179 | } |
180 | ||
025faf73 DG |
181 | /* |
182 | * Unique add of an ust app event in the given ht. This uses the custom | |
183 | * ht_match_ust_app_event match function and the event name as hash. | |
184 | */ | |
d0b96690 | 185 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
186 | struct ust_app_event *event) |
187 | { | |
188 | struct cds_lfht_node *node_ptr; | |
189 | struct ust_app_ht_key key; | |
d0b96690 | 190 | struct lttng_ht *ht; |
18eace3b | 191 | |
d0b96690 DG |
192 | assert(ua_chan); |
193 | assert(ua_chan->events); | |
18eace3b DG |
194 | assert(event); |
195 | ||
d0b96690 | 196 | ht = ua_chan->events; |
18eace3b DG |
197 | key.name = event->attr.name; |
198 | key.filter = event->filter; | |
2106efa0 | 199 | key.loglevel_type = event->attr.loglevel; |
91c89f23 | 200 | key.exclusion = event->exclusion; |
18eace3b DG |
201 | |
202 | node_ptr = cds_lfht_add_unique(ht->ht, | |
203 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
204 | ht_match_ust_app_event, &key, &event->node.node); | |
205 | assert(node_ptr == &event->node.node); | |
206 | } | |
207 | ||
d88aee68 DG |
208 | /* |
209 | * Close the notify socket from the given RCU head object. This MUST be called | |
210 | * through a call_rcu(). | |
211 | */ | |
212 | static void close_notify_sock_rcu(struct rcu_head *head) | |
213 | { | |
214 | int ret; | |
215 | struct ust_app_notify_sock_obj *obj = | |
216 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
217 | ||
218 | /* Must have a valid fd here. */ | |
219 | assert(obj->fd >= 0); | |
220 | ||
221 | ret = close(obj->fd); | |
222 | if (ret) { | |
223 | ERR("close notify sock %d RCU", obj->fd); | |
224 | } | |
225 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
226 | ||
227 | free(obj); | |
228 | } | |
229 | ||
7972aab2 DG |
230 | /* |
231 | * Return the session registry according to the buffer type of the given | |
232 | * session. | |
233 | * | |
234 | * A registry per UID object MUST exists before calling this function or else | |
235 | * it assert() if not found. RCU read side lock must be acquired. | |
236 | */ | |
237 | static struct ust_registry_session *get_session_registry( | |
238 | struct ust_app_session *ua_sess) | |
239 | { | |
240 | struct ust_registry_session *registry = NULL; | |
241 | ||
242 | assert(ua_sess); | |
243 | ||
244 | switch (ua_sess->buffer_type) { | |
245 | case LTTNG_BUFFER_PER_PID: | |
246 | { | |
247 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
248 | if (!reg_pid) { | |
249 | goto error; | |
250 | } | |
251 | registry = reg_pid->registry->reg.ust; | |
252 | break; | |
253 | } | |
254 | case LTTNG_BUFFER_PER_UID: | |
255 | { | |
256 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
470cc211 JG |
257 | ua_sess->tracing_id, ua_sess->bits_per_long, |
258 | ua_sess->real_credentials.uid); | |
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 | ||
326 | /* | |
7972aab2 DG |
327 | * Release ust data object of the given stream. |
328 | * | |
329 | * Return 0 on success or else a negative value. | |
d80a6244 | 330 | */ |
fb45065e MD |
331 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream, |
332 | struct ust_app *app) | |
d80a6244 | 333 | { |
7972aab2 | 334 | int ret = 0; |
ffe60014 DG |
335 | |
336 | assert(stream); | |
337 | ||
8b366481 | 338 | if (stream->obj) { |
fb45065e | 339 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 340 | ret = ustctl_release_object(sock, stream->obj); |
fb45065e | 341 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
342 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
343 | ERR("UST app sock %d release stream obj failed with ret %d", | |
344 | sock, ret); | |
345 | } | |
4063050c | 346 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
347 | free(stream->obj); |
348 | } | |
7972aab2 DG |
349 | |
350 | return ret; | |
351 | } | |
352 | ||
353 | /* | |
354 | * Delete ust app stream safely. RCU read lock must be held before calling | |
355 | * this function. | |
356 | */ | |
357 | static | |
fb45065e MD |
358 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream, |
359 | struct ust_app *app) | |
7972aab2 DG |
360 | { |
361 | assert(stream); | |
362 | ||
fb45065e | 363 | (void) release_ust_app_stream(sock, stream, app); |
84cd17c6 | 364 | free(stream); |
d80a6244 DG |
365 | } |
366 | ||
36b588ed MD |
367 | /* |
368 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
369 | * section and outside of call_rcu thread, so we postpone its execution |
370 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
371 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
372 | */ |
373 | static | |
374 | void delete_ust_app_channel_rcu(struct rcu_head *head) | |
375 | { | |
376 | struct ust_app_channel *ua_chan = | |
377 | caa_container_of(head, struct ust_app_channel, rcu_head); | |
378 | ||
0b2dc8df MD |
379 | ht_cleanup_push(ua_chan->ctx); |
380 | ht_cleanup_push(ua_chan->events); | |
36b588ed MD |
381 | free(ua_chan); |
382 | } | |
383 | ||
fb83fe64 JD |
384 | /* |
385 | * Extract the lost packet or discarded events counter when the channel is | |
386 | * being deleted and store the value in the parent channel so we can | |
387 | * access it from lttng list and at stop/destroy. | |
82cac6d2 JG |
388 | * |
389 | * The session list lock must be held by the caller. | |
fb83fe64 JD |
390 | */ |
391 | static | |
392 | void save_per_pid_lost_discarded_counters(struct ust_app_channel *ua_chan) | |
393 | { | |
394 | uint64_t discarded = 0, lost = 0; | |
395 | struct ltt_session *session; | |
396 | struct ltt_ust_channel *uchan; | |
397 | ||
398 | if (ua_chan->attr.type != LTTNG_UST_CHAN_PER_CPU) { | |
399 | return; | |
400 | } | |
401 | ||
402 | rcu_read_lock(); | |
403 | session = session_find_by_id(ua_chan->session->tracing_id); | |
d68ec974 JG |
404 | if (!session || !session->ust_session) { |
405 | /* | |
406 | * Not finding the session is not an error because there are | |
407 | * multiple ways the channels can be torn down. | |
408 | * | |
409 | * 1) The session daemon can initiate the destruction of the | |
410 | * ust app session after receiving a destroy command or | |
411 | * during its shutdown/teardown. | |
412 | * 2) The application, since we are in per-pid tracing, is | |
413 | * unregistering and tearing down its ust app session. | |
414 | * | |
415 | * Both paths are protected by the session list lock which | |
416 | * ensures that the accounting of lost packets and discarded | |
417 | * events is done exactly once. The session is then unpublished | |
418 | * from the session list, resulting in this condition. | |
419 | */ | |
fb83fe64 JD |
420 | goto end; |
421 | } | |
422 | ||
423 | if (ua_chan->attr.overwrite) { | |
424 | consumer_get_lost_packets(ua_chan->session->tracing_id, | |
425 | ua_chan->key, session->ust_session->consumer, | |
426 | &lost); | |
427 | } else { | |
428 | consumer_get_discarded_events(ua_chan->session->tracing_id, | |
429 | ua_chan->key, session->ust_session->consumer, | |
430 | &discarded); | |
431 | } | |
432 | uchan = trace_ust_find_channel_by_name( | |
433 | session->ust_session->domain_global.channels, | |
434 | ua_chan->name); | |
435 | if (!uchan) { | |
436 | ERR("Missing UST channel to store discarded counters"); | |
437 | goto end; | |
438 | } | |
439 | ||
440 | uchan->per_pid_closed_app_discarded += discarded; | |
441 | uchan->per_pid_closed_app_lost += lost; | |
442 | ||
443 | end: | |
444 | rcu_read_unlock(); | |
e32d7f27 JG |
445 | if (session) { |
446 | session_put(session); | |
447 | } | |
fb83fe64 JD |
448 | } |
449 | ||
d80a6244 DG |
450 | /* |
451 | * Delete ust app channel safely. RCU read lock must be held before calling | |
452 | * this function. | |
82cac6d2 JG |
453 | * |
454 | * The session list lock must be held by the caller. | |
d80a6244 | 455 | */ |
8b366481 | 456 | static |
d0b96690 DG |
457 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
458 | struct ust_app *app) | |
d80a6244 DG |
459 | { |
460 | int ret; | |
bec39940 | 461 | struct lttng_ht_iter iter; |
d80a6244 | 462 | struct ust_app_event *ua_event; |
55cc08a6 | 463 | struct ust_app_ctx *ua_ctx; |
030a66fa | 464 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 465 | struct ust_registry_session *registry; |
d80a6244 | 466 | |
ffe60014 DG |
467 | assert(ua_chan); |
468 | ||
469 | DBG3("UST app deleting channel %s", ua_chan->name); | |
470 | ||
55cc08a6 | 471 | /* Wipe stream */ |
d80a6244 | 472 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 473 | cds_list_del(&stream->list); |
fb45065e | 474 | delete_ust_app_stream(sock, stream, app); |
d80a6244 DG |
475 | } |
476 | ||
55cc08a6 | 477 | /* Wipe context */ |
bec39940 | 478 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
31746f93 | 479 | cds_list_del(&ua_ctx->list); |
bec39940 | 480 | ret = lttng_ht_del(ua_chan->ctx, &iter); |
55cc08a6 | 481 | assert(!ret); |
fb45065e | 482 | delete_ust_app_ctx(sock, ua_ctx, app); |
55cc08a6 | 483 | } |
d80a6244 | 484 | |
55cc08a6 | 485 | /* Wipe events */ |
bec39940 DG |
486 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
487 | node.node) { | |
488 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 489 | assert(!ret); |
fb45065e | 490 | delete_ust_app_event(sock, ua_event, app); |
d80a6244 | 491 | } |
edb67388 | 492 | |
c8335706 MD |
493 | if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) { |
494 | /* Wipe and free registry from session registry. */ | |
495 | registry = get_session_registry(ua_chan->session); | |
496 | if (registry) { | |
e9404c27 | 497 | ust_registry_channel_del_free(registry, ua_chan->key, |
e38d96f9 MD |
498 | sock >= 0); |
499 | } | |
45798a31 JG |
500 | /* |
501 | * A negative socket can be used by the caller when | |
502 | * cleaning-up a ua_chan in an error path. Skip the | |
503 | * accounting in this case. | |
504 | */ | |
e38d96f9 MD |
505 | if (sock >= 0) { |
506 | save_per_pid_lost_discarded_counters(ua_chan); | |
c8335706 | 507 | } |
7972aab2 | 508 | } |
d0b96690 | 509 | |
edb67388 | 510 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
511 | /* Remove channel from application UST object descriptor. */ |
512 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
c6e62271 DG |
513 | ret = lttng_ht_del(app->ust_objd, &iter); |
514 | assert(!ret); | |
fb45065e | 515 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 516 | ret = ustctl_release_object(sock, ua_chan->obj); |
fb45065e | 517 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
518 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
519 | ERR("UST app sock %d release channel obj failed with ret %d", | |
520 | sock, ret); | |
521 | } | |
7972aab2 | 522 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
523 | free(ua_chan->obj); |
524 | } | |
36b588ed | 525 | call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); |
d80a6244 DG |
526 | } |
527 | ||
fb45065e MD |
528 | int ust_app_register_done(struct ust_app *app) |
529 | { | |
530 | int ret; | |
531 | ||
532 | pthread_mutex_lock(&app->sock_lock); | |
533 | ret = ustctl_register_done(app->sock); | |
534 | pthread_mutex_unlock(&app->sock_lock); | |
535 | return ret; | |
536 | } | |
537 | ||
538 | int ust_app_release_object(struct ust_app *app, struct lttng_ust_object_data *data) | |
539 | { | |
540 | int ret, sock; | |
541 | ||
542 | if (app) { | |
543 | pthread_mutex_lock(&app->sock_lock); | |
544 | sock = app->sock; | |
545 | } else { | |
546 | sock = -1; | |
547 | } | |
548 | ret = ustctl_release_object(sock, data); | |
549 | if (app) { | |
550 | pthread_mutex_unlock(&app->sock_lock); | |
551 | } | |
552 | return ret; | |
553 | } | |
554 | ||
331744e3 | 555 | /* |
1b532a60 DG |
556 | * Push metadata to consumer socket. |
557 | * | |
dc2bbdae MD |
558 | * RCU read-side lock must be held to guarantee existance of socket. |
559 | * Must be called with the ust app session lock held. | |
560 | * Must be called with the registry lock held. | |
331744e3 JD |
561 | * |
562 | * On success, return the len of metadata pushed or else a negative value. | |
2c57e06d MD |
563 | * Returning a -EPIPE return value means we could not send the metadata, |
564 | * but it can be caused by recoverable errors (e.g. the application has | |
565 | * terminated concurrently). | |
331744e3 JD |
566 | */ |
567 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
568 | struct consumer_socket *socket, int send_zero_data) | |
569 | { | |
570 | int ret; | |
571 | char *metadata_str = NULL; | |
c585821b | 572 | size_t len, offset, new_metadata_len_sent; |
331744e3 | 573 | ssize_t ret_val; |
93ec662e | 574 | uint64_t metadata_key, metadata_version; |
331744e3 JD |
575 | |
576 | assert(registry); | |
577 | assert(socket); | |
1b532a60 | 578 | |
c585821b MD |
579 | metadata_key = registry->metadata_key; |
580 | ||
ce34fcd0 | 581 | /* |
dc2bbdae MD |
582 | * Means that no metadata was assigned to the session. This can |
583 | * happens if no start has been done previously. | |
ce34fcd0 | 584 | */ |
c585821b | 585 | if (!metadata_key) { |
ce34fcd0 MD |
586 | return 0; |
587 | } | |
588 | ||
331744e3 JD |
589 | offset = registry->metadata_len_sent; |
590 | len = registry->metadata_len - registry->metadata_len_sent; | |
c585821b | 591 | new_metadata_len_sent = registry->metadata_len; |
93ec662e | 592 | metadata_version = registry->metadata_version; |
331744e3 JD |
593 | if (len == 0) { |
594 | DBG3("No metadata to push for metadata key %" PRIu64, | |
595 | registry->metadata_key); | |
596 | ret_val = len; | |
597 | if (send_zero_data) { | |
598 | DBG("No metadata to push"); | |
599 | goto push_data; | |
600 | } | |
601 | goto end; | |
602 | } | |
603 | ||
604 | /* Allocate only what we have to send. */ | |
605 | metadata_str = zmalloc(len); | |
606 | if (!metadata_str) { | |
607 | PERROR("zmalloc ust app metadata string"); | |
608 | ret_val = -ENOMEM; | |
609 | goto error; | |
610 | } | |
c585821b | 611 | /* Copy what we haven't sent out. */ |
331744e3 | 612 | memcpy(metadata_str, registry->metadata + offset, len); |
331744e3 JD |
613 | |
614 | push_data: | |
c585821b MD |
615 | pthread_mutex_unlock(®istry->lock); |
616 | /* | |
617 | * We need to unlock the registry while we push metadata to | |
618 | * break a circular dependency between the consumerd metadata | |
619 | * lock and the sessiond registry lock. Indeed, pushing metadata | |
620 | * to the consumerd awaits that it gets pushed all the way to | |
621 | * relayd, but doing so requires grabbing the metadata lock. If | |
622 | * a concurrent metadata request is being performed by | |
623 | * consumerd, this can try to grab the registry lock on the | |
624 | * sessiond while holding the metadata lock on the consumer | |
625 | * daemon. Those push and pull schemes are performed on two | |
626 | * different bidirectionnal communication sockets. | |
627 | */ | |
628 | ret = consumer_push_metadata(socket, metadata_key, | |
93ec662e | 629 | metadata_str, len, offset, metadata_version); |
c585821b | 630 | pthread_mutex_lock(®istry->lock); |
331744e3 | 631 | if (ret < 0) { |
000baf6a | 632 | /* |
dc2bbdae MD |
633 | * There is an acceptable race here between the registry |
634 | * metadata key assignment and the creation on the | |
635 | * consumer. The session daemon can concurrently push | |
636 | * metadata for this registry while being created on the | |
637 | * consumer since the metadata key of the registry is | |
638 | * assigned *before* it is setup to avoid the consumer | |
639 | * to ask for metadata that could possibly be not found | |
640 | * in the session daemon. | |
000baf6a | 641 | * |
dc2bbdae MD |
642 | * The metadata will get pushed either by the session |
643 | * being stopped or the consumer requesting metadata if | |
644 | * that race is triggered. | |
000baf6a DG |
645 | */ |
646 | if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) { | |
647 | ret = 0; | |
c585821b MD |
648 | } else { |
649 | ERR("Error pushing metadata to consumer"); | |
000baf6a | 650 | } |
331744e3 JD |
651 | ret_val = ret; |
652 | goto error_push; | |
c585821b MD |
653 | } else { |
654 | /* | |
655 | * Metadata may have been concurrently pushed, since | |
656 | * we're not holding the registry lock while pushing to | |
657 | * consumer. This is handled by the fact that we send | |
658 | * the metadata content, size, and the offset at which | |
659 | * that metadata belongs. This may arrive out of order | |
660 | * on the consumer side, and the consumer is able to | |
661 | * deal with overlapping fragments. The consumer | |
662 | * supports overlapping fragments, which must be | |
663 | * contiguous starting from offset 0. We keep the | |
664 | * largest metadata_len_sent value of the concurrent | |
665 | * send. | |
666 | */ | |
667 | registry->metadata_len_sent = | |
668 | max_t(size_t, registry->metadata_len_sent, | |
669 | new_metadata_len_sent); | |
331744e3 | 670 | } |
331744e3 JD |
671 | free(metadata_str); |
672 | return len; | |
673 | ||
674 | end: | |
675 | error: | |
ce34fcd0 MD |
676 | if (ret_val) { |
677 | /* | |
dc2bbdae MD |
678 | * On error, flag the registry that the metadata is |
679 | * closed. We were unable to push anything and this | |
680 | * means that either the consumer is not responding or | |
681 | * the metadata cache has been destroyed on the | |
682 | * consumer. | |
ce34fcd0 MD |
683 | */ |
684 | registry->metadata_closed = 1; | |
685 | } | |
331744e3 JD |
686 | error_push: |
687 | free(metadata_str); | |
688 | return ret_val; | |
689 | } | |
690 | ||
d88aee68 | 691 | /* |
ce34fcd0 | 692 | * For a given application and session, push metadata to consumer. |
331744e3 JD |
693 | * Either sock or consumer is required : if sock is NULL, the default |
694 | * socket to send the metadata is retrieved from consumer, if sock | |
695 | * is not NULL we use it to send the metadata. | |
ce34fcd0 | 696 | * RCU read-side lock must be held while calling this function, |
dc2bbdae MD |
697 | * therefore ensuring existance of registry. It also ensures existance |
698 | * of socket throughout this function. | |
d88aee68 DG |
699 | * |
700 | * Return 0 on success else a negative error. | |
2c57e06d MD |
701 | * Returning a -EPIPE return value means we could not send the metadata, |
702 | * but it can be caused by recoverable errors (e.g. the application has | |
703 | * terminated concurrently). | |
d88aee68 | 704 | */ |
7972aab2 DG |
705 | static int push_metadata(struct ust_registry_session *registry, |
706 | struct consumer_output *consumer) | |
d88aee68 | 707 | { |
331744e3 JD |
708 | int ret_val; |
709 | ssize_t ret; | |
d88aee68 DG |
710 | struct consumer_socket *socket; |
711 | ||
7972aab2 DG |
712 | assert(registry); |
713 | assert(consumer); | |
714 | ||
ce34fcd0 | 715 | pthread_mutex_lock(®istry->lock); |
ce34fcd0 | 716 | if (registry->metadata_closed) { |
dc2bbdae MD |
717 | ret_val = -EPIPE; |
718 | goto error; | |
d88aee68 DG |
719 | } |
720 | ||
d88aee68 | 721 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
722 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
723 | consumer); | |
d88aee68 | 724 | if (!socket) { |
331744e3 | 725 | ret_val = -1; |
ce34fcd0 | 726 | goto error; |
d88aee68 DG |
727 | } |
728 | ||
331744e3 | 729 | ret = ust_app_push_metadata(registry, socket, 0); |
d88aee68 | 730 | if (ret < 0) { |
331744e3 | 731 | ret_val = ret; |
ce34fcd0 | 732 | goto error; |
d88aee68 | 733 | } |
dc2bbdae | 734 | pthread_mutex_unlock(®istry->lock); |
d88aee68 DG |
735 | return 0; |
736 | ||
ce34fcd0 | 737 | error: |
dc2bbdae | 738 | pthread_mutex_unlock(®istry->lock); |
331744e3 | 739 | return ret_val; |
d88aee68 DG |
740 | } |
741 | ||
742 | /* | |
743 | * Send to the consumer a close metadata command for the given session. Once | |
744 | * done, the metadata channel is deleted and the session metadata pointer is | |
dc2bbdae | 745 | * nullified. The session lock MUST be held unless the application is |
d88aee68 DG |
746 | * in the destroy path. |
747 | * | |
a70ac2f4 MD |
748 | * Do not hold the registry lock while communicating with the consumerd, because |
749 | * doing so causes inter-process deadlocks between consumerd and sessiond with | |
750 | * the metadata request notification. | |
751 | * | |
d88aee68 DG |
752 | * Return 0 on success else a negative value. |
753 | */ | |
7972aab2 DG |
754 | static int close_metadata(struct ust_registry_session *registry, |
755 | struct consumer_output *consumer) | |
d88aee68 DG |
756 | { |
757 | int ret; | |
758 | struct consumer_socket *socket; | |
a70ac2f4 MD |
759 | uint64_t metadata_key; |
760 | bool registry_was_already_closed; | |
d88aee68 | 761 | |
7972aab2 DG |
762 | assert(registry); |
763 | assert(consumer); | |
d88aee68 | 764 | |
7972aab2 DG |
765 | rcu_read_lock(); |
766 | ||
ce34fcd0 | 767 | pthread_mutex_lock(®istry->lock); |
a70ac2f4 MD |
768 | metadata_key = registry->metadata_key; |
769 | registry_was_already_closed = registry->metadata_closed; | |
770 | if (metadata_key != 0) { | |
771 | /* | |
772 | * Metadata closed. Even on error this means that the consumer | |
773 | * is not responding or not found so either way a second close | |
774 | * should NOT be emit for this registry. | |
775 | */ | |
776 | registry->metadata_closed = 1; | |
777 | } | |
778 | pthread_mutex_unlock(®istry->lock); | |
ce34fcd0 | 779 | |
a70ac2f4 | 780 | if (metadata_key == 0 || registry_was_already_closed) { |
d88aee68 | 781 | ret = 0; |
1b532a60 | 782 | goto end; |
d88aee68 DG |
783 | } |
784 | ||
d88aee68 | 785 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
786 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
787 | consumer); | |
d88aee68 DG |
788 | if (!socket) { |
789 | ret = -1; | |
a70ac2f4 | 790 | goto end; |
d88aee68 DG |
791 | } |
792 | ||
a70ac2f4 | 793 | ret = consumer_close_metadata(socket, metadata_key); |
d88aee68 | 794 | if (ret < 0) { |
a70ac2f4 | 795 | goto end; |
d88aee68 DG |
796 | } |
797 | ||
1b532a60 | 798 | end: |
7972aab2 | 799 | rcu_read_unlock(); |
d88aee68 DG |
800 | return ret; |
801 | } | |
802 | ||
36b588ed MD |
803 | /* |
804 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
805 | * section and outside of call_rcu thread, so we postpone its execution |
806 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
807 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
808 | */ |
809 | static | |
810 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
811 | { | |
812 | struct ust_app_session *ua_sess = | |
813 | caa_container_of(head, struct ust_app_session, rcu_head); | |
814 | ||
0b2dc8df | 815 | ht_cleanup_push(ua_sess->channels); |
36b588ed MD |
816 | free(ua_sess); |
817 | } | |
818 | ||
d80a6244 DG |
819 | /* |
820 | * Delete ust app session safely. RCU read lock must be held before calling | |
821 | * this function. | |
82cac6d2 JG |
822 | * |
823 | * The session list lock must be held by the caller. | |
d80a6244 | 824 | */ |
8b366481 | 825 | static |
d0b96690 DG |
826 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
827 | struct ust_app *app) | |
d80a6244 DG |
828 | { |
829 | int ret; | |
bec39940 | 830 | struct lttng_ht_iter iter; |
d80a6244 | 831 | struct ust_app_channel *ua_chan; |
7972aab2 | 832 | struct ust_registry_session *registry; |
d80a6244 | 833 | |
d88aee68 DG |
834 | assert(ua_sess); |
835 | ||
1b532a60 DG |
836 | pthread_mutex_lock(&ua_sess->lock); |
837 | ||
b161602a MD |
838 | assert(!ua_sess->deleted); |
839 | ua_sess->deleted = true; | |
840 | ||
7972aab2 | 841 | registry = get_session_registry(ua_sess); |
fad1ed2f | 842 | /* Registry can be null on error path during initialization. */ |
ce34fcd0 | 843 | if (registry) { |
d88aee68 | 844 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 845 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 846 | |
7972aab2 DG |
847 | /* |
848 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
849 | * metadata only on destroy trace session in this case. Also, the |
850 | * previous push metadata could have flag the metadata registry to | |
851 | * close so don't send a close command if closed. | |
7972aab2 | 852 | */ |
ce34fcd0 | 853 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
854 | /* And ask to close it for this session registry. */ |
855 | (void) close_metadata(registry, ua_sess->consumer); | |
856 | } | |
d80a6244 DG |
857 | } |
858 | ||
bec39940 DG |
859 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
860 | node.node) { | |
861 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 862 | assert(!ret); |
d0b96690 | 863 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 864 | } |
d80a6244 | 865 | |
7972aab2 DG |
866 | /* In case of per PID, the registry is kept in the session. */ |
867 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
868 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
869 | if (reg_pid) { | |
fad1ed2f JR |
870 | /* |
871 | * Registry can be null on error path during | |
872 | * initialization. | |
873 | */ | |
7972aab2 DG |
874 | buffer_reg_pid_remove(reg_pid); |
875 | buffer_reg_pid_destroy(reg_pid); | |
876 | } | |
877 | } | |
d0b96690 | 878 | |
aee6bafd | 879 | if (ua_sess->handle != -1) { |
fb45065e | 880 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 881 | ret = ustctl_release_handle(sock, ua_sess->handle); |
fb45065e | 882 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
883 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
884 | ERR("UST app sock %d release session handle failed with ret %d", | |
885 | sock, ret); | |
886 | } | |
10b56aef MD |
887 | /* Remove session from application UST object descriptor. */ |
888 | iter.iter.node = &ua_sess->ust_objd_node.node; | |
889 | ret = lttng_ht_del(app->ust_sessions_objd, &iter); | |
890 | assert(!ret); | |
aee6bafd | 891 | } |
10b56aef | 892 | |
1b532a60 DG |
893 | pthread_mutex_unlock(&ua_sess->lock); |
894 | ||
6addfa37 MD |
895 | consumer_output_put(ua_sess->consumer); |
896 | ||
36b588ed | 897 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 898 | } |
91d76f53 DG |
899 | |
900 | /* | |
284d8f55 DG |
901 | * Delete a traceable application structure from the global list. Never call |
902 | * this function outside of a call_rcu call. | |
36b588ed MD |
903 | * |
904 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 905 | */ |
8b366481 DG |
906 | static |
907 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 908 | { |
8b366481 | 909 | int ret, sock; |
d42f20df | 910 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 911 | |
82cac6d2 JG |
912 | /* |
913 | * The session list lock must be held during this function to guarantee | |
914 | * the existence of ua_sess. | |
915 | */ | |
916 | session_lock_list(); | |
d80a6244 | 917 | /* Delete ust app sessions info */ |
852d0037 DG |
918 | sock = app->sock; |
919 | app->sock = -1; | |
d80a6244 | 920 | |
8b366481 | 921 | /* Wipe sessions */ |
d42f20df DG |
922 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
923 | teardown_node) { | |
924 | /* Free every object in the session and the session. */ | |
36b588ed | 925 | rcu_read_lock(); |
d0b96690 | 926 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 927 | rcu_read_unlock(); |
d80a6244 | 928 | } |
36b588ed | 929 | |
0b2dc8df | 930 | ht_cleanup_push(app->sessions); |
10b56aef | 931 | ht_cleanup_push(app->ust_sessions_objd); |
0b2dc8df | 932 | ht_cleanup_push(app->ust_objd); |
d80a6244 | 933 | |
6414a713 | 934 | /* |
852d0037 DG |
935 | * Wait until we have deleted the application from the sock hash table |
936 | * before closing this socket, otherwise an application could re-use the | |
937 | * socket ID and race with the teardown, using the same hash table entry. | |
938 | * | |
939 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
940 | * all RCU readers that could run concurrently with unregister app, | |
941 | * therefore we _need_ to only close that socket after a grace period. So | |
942 | * it should stay in this RCU callback. | |
943 | * | |
944 | * This close() is a very important step of the synchronization model so | |
945 | * every modification to this function must be carefully reviewed. | |
6414a713 | 946 | */ |
799e2c4f MD |
947 | ret = close(sock); |
948 | if (ret) { | |
949 | PERROR("close"); | |
950 | } | |
4063050c | 951 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 952 | |
852d0037 | 953 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 954 | free(app); |
82cac6d2 | 955 | session_unlock_list(); |
099e26bd DG |
956 | } |
957 | ||
958 | /* | |
f6a9efaa | 959 | * URCU intermediate call to delete an UST app. |
099e26bd | 960 | */ |
8b366481 DG |
961 | static |
962 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 963 | { |
bec39940 DG |
964 | struct lttng_ht_node_ulong *node = |
965 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 966 | struct ust_app *app = |
852d0037 | 967 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 968 | |
852d0037 | 969 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 970 | delete_ust_app(app); |
099e26bd DG |
971 | } |
972 | ||
ffe60014 DG |
973 | /* |
974 | * Delete the session from the application ht and delete the data structure by | |
975 | * freeing every object inside and releasing them. | |
82cac6d2 JG |
976 | * |
977 | * The session list lock must be held by the caller. | |
ffe60014 | 978 | */ |
d0b96690 | 979 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
980 | struct ust_app_session *ua_sess) |
981 | { | |
982 | int ret; | |
983 | struct lttng_ht_iter iter; | |
984 | ||
985 | assert(app); | |
986 | assert(ua_sess); | |
987 | ||
988 | iter.iter.node = &ua_sess->node.node; | |
989 | ret = lttng_ht_del(app->sessions, &iter); | |
990 | if (ret) { | |
991 | /* Already scheduled for teardown. */ | |
992 | goto end; | |
993 | } | |
994 | ||
995 | /* Once deleted, free the data structure. */ | |
d0b96690 | 996 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
997 | |
998 | end: | |
999 | return; | |
1000 | } | |
1001 | ||
8b366481 DG |
1002 | /* |
1003 | * Alloc new UST app session. | |
1004 | */ | |
1005 | static | |
40bbd087 | 1006 | struct ust_app_session *alloc_ust_app_session(void) |
8b366481 DG |
1007 | { |
1008 | struct ust_app_session *ua_sess; | |
1009 | ||
1010 | /* Init most of the default value by allocating and zeroing */ | |
1011 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
1012 | if (ua_sess == NULL) { | |
1013 | PERROR("malloc"); | |
ffe60014 | 1014 | goto error_free; |
8b366481 DG |
1015 | } |
1016 | ||
1017 | ua_sess->handle = -1; | |
bec39940 | 1018 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
ad7a9107 | 1019 | ua_sess->metadata_attr.type = LTTNG_UST_CHAN_METADATA; |
84ad93e8 | 1020 | pthread_mutex_init(&ua_sess->lock, NULL); |
ad7a9107 | 1021 | |
8b366481 DG |
1022 | return ua_sess; |
1023 | ||
ffe60014 | 1024 | error_free: |
8b366481 DG |
1025 | return NULL; |
1026 | } | |
1027 | ||
1028 | /* | |
1029 | * Alloc new UST app channel. | |
1030 | */ | |
1031 | static | |
1032 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 1033 | struct ust_app_session *ua_sess, |
ffe60014 | 1034 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
1035 | { |
1036 | struct ust_app_channel *ua_chan; | |
1037 | ||
1038 | /* Init most of the default value by allocating and zeroing */ | |
1039 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
1040 | if (ua_chan == NULL) { | |
1041 | PERROR("malloc"); | |
1042 | goto error; | |
1043 | } | |
1044 | ||
1045 | /* Setup channel name */ | |
1046 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
1047 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
1048 | ||
1049 | ua_chan->enabled = 1; | |
1050 | ua_chan->handle = -1; | |
45893984 | 1051 | ua_chan->session = ua_sess; |
ffe60014 | 1052 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
1053 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
1054 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
1055 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
1056 | |
1057 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
31746f93 | 1058 | CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); |
8b366481 DG |
1059 | |
1060 | /* Copy attributes */ | |
1061 | if (attr) { | |
ffe60014 | 1062 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
1063 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
1064 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
1065 | ua_chan->attr.overwrite = attr->overwrite; | |
1066 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
1067 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
1068 | ua_chan->attr.output = attr->output; | |
491d1539 | 1069 | ua_chan->attr.blocking_timeout = attr->u.s.blocking_timeout; |
8b366481 | 1070 | } |
ffe60014 DG |
1071 | /* By default, the channel is a per cpu channel. */ |
1072 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
1073 | |
1074 | DBG3("UST app channel %s allocated", ua_chan->name); | |
1075 | ||
1076 | return ua_chan; | |
1077 | ||
1078 | error: | |
1079 | return NULL; | |
1080 | } | |
1081 | ||
37f1c236 DG |
1082 | /* |
1083 | * Allocate and initialize a UST app stream. | |
1084 | * | |
1085 | * Return newly allocated stream pointer or NULL on error. | |
1086 | */ | |
ffe60014 | 1087 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
1088 | { |
1089 | struct ust_app_stream *stream = NULL; | |
1090 | ||
1091 | stream = zmalloc(sizeof(*stream)); | |
1092 | if (stream == NULL) { | |
1093 | PERROR("zmalloc ust app stream"); | |
1094 | goto error; | |
1095 | } | |
1096 | ||
1097 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
1098 | stream->handle = -1; | |
1099 | ||
1100 | error: | |
1101 | return stream; | |
1102 | } | |
1103 | ||
8b366481 DG |
1104 | /* |
1105 | * Alloc new UST app event. | |
1106 | */ | |
1107 | static | |
1108 | struct ust_app_event *alloc_ust_app_event(char *name, | |
1109 | struct lttng_ust_event *attr) | |
1110 | { | |
1111 | struct ust_app_event *ua_event; | |
1112 | ||
1113 | /* Init most of the default value by allocating and zeroing */ | |
1114 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
1115 | if (ua_event == NULL) { | |
20533947 | 1116 | PERROR("Failed to allocate ust_app_event structure"); |
8b366481 DG |
1117 | goto error; |
1118 | } | |
1119 | ||
1120 | ua_event->enabled = 1; | |
1121 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
1122 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 1123 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
1124 | |
1125 | /* Copy attributes */ | |
1126 | if (attr) { | |
1127 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
1128 | } | |
1129 | ||
1130 | DBG3("UST app event %s allocated", ua_event->name); | |
1131 | ||
1132 | return ua_event; | |
1133 | ||
1134 | error: | |
1135 | return NULL; | |
1136 | } | |
1137 | ||
1138 | /* | |
1139 | * Alloc new UST app context. | |
1140 | */ | |
1141 | static | |
bdf64013 | 1142 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context_attr *uctx) |
8b366481 DG |
1143 | { |
1144 | struct ust_app_ctx *ua_ctx; | |
1145 | ||
1146 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
1147 | if (ua_ctx == NULL) { | |
1148 | goto error; | |
1149 | } | |
1150 | ||
31746f93 DG |
1151 | CDS_INIT_LIST_HEAD(&ua_ctx->list); |
1152 | ||
8b366481 DG |
1153 | if (uctx) { |
1154 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
bdf64013 JG |
1155 | if (uctx->ctx == LTTNG_UST_CONTEXT_APP_CONTEXT) { |
1156 | char *provider_name = NULL, *ctx_name = NULL; | |
1157 | ||
1158 | provider_name = strdup(uctx->u.app_ctx.provider_name); | |
1159 | ctx_name = strdup(uctx->u.app_ctx.ctx_name); | |
1160 | if (!provider_name || !ctx_name) { | |
1161 | free(provider_name); | |
1162 | free(ctx_name); | |
1163 | goto error; | |
1164 | } | |
1165 | ||
1166 | ua_ctx->ctx.u.app_ctx.provider_name = provider_name; | |
1167 | ua_ctx->ctx.u.app_ctx.ctx_name = ctx_name; | |
1168 | } | |
8b366481 DG |
1169 | } |
1170 | ||
1171 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
8b366481 | 1172 | return ua_ctx; |
bdf64013 JG |
1173 | error: |
1174 | free(ua_ctx); | |
1175 | return NULL; | |
8b366481 DG |
1176 | } |
1177 | ||
025faf73 DG |
1178 | /* |
1179 | * Allocate a filter and copy the given original filter. | |
1180 | * | |
1181 | * Return allocated filter or NULL on error. | |
1182 | */ | |
51755dc8 JG |
1183 | static struct lttng_filter_bytecode *copy_filter_bytecode( |
1184 | struct lttng_filter_bytecode *orig_f) | |
025faf73 | 1185 | { |
51755dc8 | 1186 | struct lttng_filter_bytecode *filter = NULL; |
025faf73 DG |
1187 | |
1188 | /* Copy filter bytecode */ | |
1189 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
1190 | if (!filter) { | |
51755dc8 | 1191 | PERROR("zmalloc alloc filter bytecode"); |
025faf73 DG |
1192 | goto error; |
1193 | } | |
1194 | ||
1195 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
1196 | ||
1197 | error: | |
1198 | return filter; | |
1199 | } | |
1200 | ||
51755dc8 JG |
1201 | /* |
1202 | * Create a liblttng-ust filter bytecode from given bytecode. | |
1203 | * | |
1204 | * Return allocated filter or NULL on error. | |
1205 | */ | |
1206 | static struct lttng_ust_filter_bytecode *create_ust_bytecode_from_bytecode( | |
1207 | struct lttng_filter_bytecode *orig_f) | |
1208 | { | |
1209 | struct lttng_ust_filter_bytecode *filter = NULL; | |
1210 | ||
1211 | /* Copy filter bytecode */ | |
1212 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
1213 | if (!filter) { | |
1214 | PERROR("zmalloc alloc ust filter bytecode"); | |
1215 | goto error; | |
1216 | } | |
1217 | ||
1218 | assert(sizeof(struct lttng_filter_bytecode) == | |
1219 | sizeof(struct lttng_ust_filter_bytecode)); | |
1220 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
1221 | error: | |
1222 | return filter; | |
1223 | } | |
1224 | ||
099e26bd | 1225 | /* |
421cb601 DG |
1226 | * Find an ust_app using the sock and return it. RCU read side lock must be |
1227 | * held before calling this helper function. | |
099e26bd | 1228 | */ |
f20baf8e | 1229 | struct ust_app *ust_app_find_by_sock(int sock) |
099e26bd | 1230 | { |
bec39940 | 1231 | struct lttng_ht_node_ulong *node; |
bec39940 | 1232 | struct lttng_ht_iter iter; |
f6a9efaa | 1233 | |
852d0037 | 1234 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 1235 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
1236 | if (node == NULL) { |
1237 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
1238 | goto error; |
1239 | } | |
852d0037 DG |
1240 | |
1241 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
1242 | |
1243 | error: | |
1244 | return NULL; | |
099e26bd DG |
1245 | } |
1246 | ||
d0b96690 DG |
1247 | /* |
1248 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
1249 | * be held before calling this helper function. | |
1250 | */ | |
1251 | static struct ust_app *find_app_by_notify_sock(int sock) | |
1252 | { | |
1253 | struct lttng_ht_node_ulong *node; | |
1254 | struct lttng_ht_iter iter; | |
1255 | ||
1256 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
1257 | &iter); | |
1258 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1259 | if (node == NULL) { | |
1260 | DBG2("UST app find by notify sock %d not found", sock); | |
1261 | goto error; | |
1262 | } | |
1263 | ||
1264 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
1265 | ||
1266 | error: | |
1267 | return NULL; | |
1268 | } | |
1269 | ||
025faf73 DG |
1270 | /* |
1271 | * Lookup for an ust app event based on event name, filter bytecode and the | |
1272 | * event loglevel. | |
1273 | * | |
1274 | * Return an ust_app_event object or NULL on error. | |
1275 | */ | |
18eace3b | 1276 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
88e3c2f5 | 1277 | const char *name, const struct lttng_filter_bytecode *filter, |
2106efa0 | 1278 | int loglevel_value, |
39c5a3a7 | 1279 | const struct lttng_event_exclusion *exclusion) |
18eace3b DG |
1280 | { |
1281 | struct lttng_ht_iter iter; | |
1282 | struct lttng_ht_node_str *node; | |
1283 | struct ust_app_event *event = NULL; | |
1284 | struct ust_app_ht_key key; | |
18eace3b DG |
1285 | |
1286 | assert(name); | |
1287 | assert(ht); | |
1288 | ||
1289 | /* Setup key for event lookup. */ | |
1290 | key.name = name; | |
1291 | key.filter = filter; | |
2106efa0 | 1292 | key.loglevel_type = loglevel_value; |
39c5a3a7 | 1293 | /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */ |
51755dc8 | 1294 | key.exclusion = exclusion; |
18eace3b | 1295 | |
025faf73 DG |
1296 | /* Lookup using the event name as hash and a custom match fct. */ |
1297 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1298 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1299 | node = lttng_ht_iter_get_node_str(&iter); |
1300 | if (node == NULL) { | |
1301 | goto end; | |
1302 | } | |
1303 | ||
1304 | event = caa_container_of(node, struct ust_app_event, node); | |
1305 | ||
1306 | end: | |
18eace3b DG |
1307 | return event; |
1308 | } | |
1309 | ||
55cc08a6 DG |
1310 | /* |
1311 | * Create the channel context on the tracer. | |
d0b96690 DG |
1312 | * |
1313 | * Called with UST app session lock held. | |
55cc08a6 DG |
1314 | */ |
1315 | static | |
1316 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1317 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1318 | { | |
1319 | int ret; | |
1320 | ||
840cb59c | 1321 | health_code_update(); |
86acf0da | 1322 | |
fb45065e | 1323 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1324 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 | 1325 | ua_chan->obj, &ua_ctx->obj); |
fb45065e | 1326 | pthread_mutex_unlock(&app->sock_lock); |
55cc08a6 | 1327 | if (ret < 0) { |
ffe60014 DG |
1328 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1329 | ERR("UST app create channel context failed for app (pid: %d) " | |
1330 | "with ret %d", app->pid, ret); | |
1331 | } else { | |
3757b385 DG |
1332 | /* |
1333 | * This is normal behavior, an application can die during the | |
1334 | * creation process. Don't report an error so the execution can | |
1335 | * continue normally. | |
1336 | */ | |
1337 | ret = 0; | |
88e3c2f5 | 1338 | DBG3("UST app add context failed. Application is dead."); |
ffe60014 | 1339 | } |
55cc08a6 DG |
1340 | goto error; |
1341 | } | |
1342 | ||
1343 | ua_ctx->handle = ua_ctx->obj->handle; | |
1344 | ||
d0b96690 DG |
1345 | DBG2("UST app context handle %d created successfully for channel %s", |
1346 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1347 | |
1348 | error: | |
840cb59c | 1349 | health_code_update(); |
55cc08a6 DG |
1350 | return ret; |
1351 | } | |
1352 | ||
53a80697 MD |
1353 | /* |
1354 | * Set the filter on the tracer. | |
1355 | */ | |
1356 | static | |
1357 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
1358 | struct ust_app *app) | |
1359 | { | |
1360 | int ret; | |
51755dc8 | 1361 | struct lttng_ust_filter_bytecode *ust_bytecode = NULL; |
53a80697 | 1362 | |
840cb59c | 1363 | health_code_update(); |
86acf0da | 1364 | |
53a80697 | 1365 | if (!ua_event->filter) { |
86acf0da DG |
1366 | ret = 0; |
1367 | goto error; | |
53a80697 MD |
1368 | } |
1369 | ||
51755dc8 JG |
1370 | ust_bytecode = create_ust_bytecode_from_bytecode(ua_event->filter); |
1371 | if (!ust_bytecode) { | |
1372 | ret = -LTTNG_ERR_NOMEM; | |
1373 | goto error; | |
1374 | } | |
fb45065e | 1375 | pthread_mutex_lock(&app->sock_lock); |
51755dc8 | 1376 | ret = ustctl_set_filter(app->sock, ust_bytecode, |
53a80697 | 1377 | ua_event->obj); |
fb45065e | 1378 | pthread_mutex_unlock(&app->sock_lock); |
53a80697 | 1379 | if (ret < 0) { |
ffe60014 DG |
1380 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1381 | ERR("UST app event %s filter failed for app (pid: %d) " | |
1382 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1383 | } else { | |
3757b385 DG |
1384 | /* |
1385 | * This is normal behavior, an application can die during the | |
1386 | * creation process. Don't report an error so the execution can | |
1387 | * continue normally. | |
1388 | */ | |
1389 | ret = 0; | |
ffe60014 DG |
1390 | DBG3("UST app filter event failed. Application is dead."); |
1391 | } | |
53a80697 MD |
1392 | goto error; |
1393 | } | |
1394 | ||
1395 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
1396 | ||
1397 | error: | |
840cb59c | 1398 | health_code_update(); |
51755dc8 | 1399 | free(ust_bytecode); |
53a80697 MD |
1400 | return ret; |
1401 | } | |
1402 | ||
51755dc8 JG |
1403 | static |
1404 | struct lttng_ust_event_exclusion *create_ust_exclusion_from_exclusion( | |
1405 | struct lttng_event_exclusion *exclusion) | |
1406 | { | |
1407 | struct lttng_ust_event_exclusion *ust_exclusion = NULL; | |
1408 | size_t exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) + | |
1409 | LTTNG_UST_SYM_NAME_LEN * exclusion->count; | |
1410 | ||
1411 | ust_exclusion = zmalloc(exclusion_alloc_size); | |
1412 | if (!ust_exclusion) { | |
1413 | PERROR("malloc"); | |
1414 | goto end; | |
1415 | } | |
1416 | ||
1417 | assert(sizeof(struct lttng_event_exclusion) == | |
1418 | sizeof(struct lttng_ust_event_exclusion)); | |
1419 | memcpy(ust_exclusion, exclusion, exclusion_alloc_size); | |
1420 | end: | |
1421 | return ust_exclusion; | |
1422 | } | |
1423 | ||
7cc9a73c JI |
1424 | /* |
1425 | * Set event exclusions on the tracer. | |
1426 | */ | |
1427 | static | |
1428 | int set_ust_event_exclusion(struct ust_app_event *ua_event, | |
1429 | struct ust_app *app) | |
1430 | { | |
1431 | int ret; | |
51755dc8 | 1432 | struct lttng_ust_event_exclusion *ust_exclusion = NULL; |
7cc9a73c JI |
1433 | |
1434 | health_code_update(); | |
1435 | ||
1436 | if (!ua_event->exclusion || !ua_event->exclusion->count) { | |
1437 | ret = 0; | |
1438 | goto error; | |
1439 | } | |
1440 | ||
51755dc8 JG |
1441 | ust_exclusion = create_ust_exclusion_from_exclusion( |
1442 | ua_event->exclusion); | |
1443 | if (!ust_exclusion) { | |
1444 | ret = -LTTNG_ERR_NOMEM; | |
1445 | goto error; | |
1446 | } | |
fb45065e | 1447 | pthread_mutex_lock(&app->sock_lock); |
51755dc8 | 1448 | ret = ustctl_set_exclusion(app->sock, ust_exclusion, ua_event->obj); |
fb45065e | 1449 | pthread_mutex_unlock(&app->sock_lock); |
7cc9a73c JI |
1450 | if (ret < 0) { |
1451 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1452 | ERR("UST app event %s exclusions failed for app (pid: %d) " | |
1453 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1454 | } else { | |
1455 | /* | |
1456 | * This is normal behavior, an application can die during the | |
1457 | * creation process. Don't report an error so the execution can | |
1458 | * continue normally. | |
1459 | */ | |
1460 | ret = 0; | |
1461 | DBG3("UST app event exclusion failed. Application is dead."); | |
1462 | } | |
1463 | goto error; | |
1464 | } | |
1465 | ||
1466 | DBG2("UST exclusion set successfully for event %s", ua_event->name); | |
1467 | ||
1468 | error: | |
1469 | health_code_update(); | |
51755dc8 | 1470 | free(ust_exclusion); |
7cc9a73c JI |
1471 | return ret; |
1472 | } | |
1473 | ||
9730260e DG |
1474 | /* |
1475 | * Disable the specified event on to UST tracer for the UST session. | |
1476 | */ | |
1477 | static int disable_ust_event(struct ust_app *app, | |
1478 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1479 | { | |
1480 | int ret; | |
1481 | ||
840cb59c | 1482 | health_code_update(); |
86acf0da | 1483 | |
fb45065e | 1484 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1485 | ret = ustctl_disable(app->sock, ua_event->obj); |
fb45065e | 1486 | pthread_mutex_unlock(&app->sock_lock); |
9730260e | 1487 | if (ret < 0) { |
ffe60014 DG |
1488 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1489 | ERR("UST app event %s disable failed for app (pid: %d) " | |
1490 | "and session handle %d with ret %d", | |
1491 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1492 | } else { | |
3757b385 DG |
1493 | /* |
1494 | * This is normal behavior, an application can die during the | |
1495 | * creation process. Don't report an error so the execution can | |
1496 | * continue normally. | |
1497 | */ | |
1498 | ret = 0; | |
ffe60014 DG |
1499 | DBG3("UST app disable event failed. Application is dead."); |
1500 | } | |
9730260e DG |
1501 | goto error; |
1502 | } | |
1503 | ||
1504 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 1505 | ua_event->attr.name, app->pid); |
9730260e DG |
1506 | |
1507 | error: | |
840cb59c | 1508 | health_code_update(); |
9730260e DG |
1509 | return ret; |
1510 | } | |
1511 | ||
78f0bacd DG |
1512 | /* |
1513 | * Disable the specified channel on to UST tracer for the UST session. | |
1514 | */ | |
1515 | static int disable_ust_channel(struct ust_app *app, | |
1516 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1517 | { | |
1518 | int ret; | |
1519 | ||
840cb59c | 1520 | health_code_update(); |
86acf0da | 1521 | |
fb45065e | 1522 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1523 | ret = ustctl_disable(app->sock, ua_chan->obj); |
fb45065e | 1524 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1525 | if (ret < 0) { |
ffe60014 DG |
1526 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1527 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1528 | "and session handle %d with ret %d", | |
1529 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1530 | } else { | |
3757b385 DG |
1531 | /* |
1532 | * This is normal behavior, an application can die during the | |
1533 | * creation process. Don't report an error so the execution can | |
1534 | * continue normally. | |
1535 | */ | |
1536 | ret = 0; | |
ffe60014 DG |
1537 | DBG3("UST app disable channel failed. Application is dead."); |
1538 | } | |
78f0bacd DG |
1539 | goto error; |
1540 | } | |
1541 | ||
78f0bacd | 1542 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1543 | ua_chan->name, app->pid); |
78f0bacd DG |
1544 | |
1545 | error: | |
840cb59c | 1546 | health_code_update(); |
78f0bacd DG |
1547 | return ret; |
1548 | } | |
1549 | ||
1550 | /* | |
1551 | * Enable the specified channel on to UST tracer for the UST session. | |
1552 | */ | |
1553 | static int enable_ust_channel(struct ust_app *app, | |
1554 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1555 | { | |
1556 | int ret; | |
1557 | ||
840cb59c | 1558 | health_code_update(); |
86acf0da | 1559 | |
fb45065e | 1560 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1561 | ret = ustctl_enable(app->sock, ua_chan->obj); |
fb45065e | 1562 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1563 | if (ret < 0) { |
ffe60014 DG |
1564 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1565 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1566 | "and session handle %d with ret %d", | |
1567 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1568 | } else { | |
3757b385 DG |
1569 | /* |
1570 | * This is normal behavior, an application can die during the | |
1571 | * creation process. Don't report an error so the execution can | |
1572 | * continue normally. | |
1573 | */ | |
1574 | ret = 0; | |
ffe60014 DG |
1575 | DBG3("UST app enable channel failed. Application is dead."); |
1576 | } | |
78f0bacd DG |
1577 | goto error; |
1578 | } | |
1579 | ||
1580 | ua_chan->enabled = 1; | |
1581 | ||
1582 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1583 | ua_chan->name, app->pid); |
78f0bacd DG |
1584 | |
1585 | error: | |
840cb59c | 1586 | health_code_update(); |
78f0bacd DG |
1587 | return ret; |
1588 | } | |
1589 | ||
edb67388 DG |
1590 | /* |
1591 | * Enable the specified event on to UST tracer for the UST session. | |
1592 | */ | |
1593 | static int enable_ust_event(struct ust_app *app, | |
1594 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1595 | { | |
1596 | int ret; | |
1597 | ||
840cb59c | 1598 | health_code_update(); |
86acf0da | 1599 | |
fb45065e | 1600 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1601 | ret = ustctl_enable(app->sock, ua_event->obj); |
fb45065e | 1602 | pthread_mutex_unlock(&app->sock_lock); |
edb67388 | 1603 | if (ret < 0) { |
ffe60014 DG |
1604 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1605 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1606 | "and session handle %d with ret %d", | |
1607 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1608 | } else { | |
3757b385 DG |
1609 | /* |
1610 | * This is normal behavior, an application can die during the | |
1611 | * creation process. Don't report an error so the execution can | |
1612 | * continue normally. | |
1613 | */ | |
1614 | ret = 0; | |
ffe60014 DG |
1615 | DBG3("UST app enable event failed. Application is dead."); |
1616 | } | |
edb67388 DG |
1617 | goto error; |
1618 | } | |
1619 | ||
1620 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1621 | ua_event->attr.name, app->pid); |
edb67388 DG |
1622 | |
1623 | error: | |
840cb59c | 1624 | health_code_update(); |
edb67388 DG |
1625 | return ret; |
1626 | } | |
1627 | ||
099e26bd | 1628 | /* |
7972aab2 | 1629 | * Send channel and stream buffer to application. |
4f3ab6ee | 1630 | * |
ffe60014 | 1631 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1632 | */ |
7972aab2 DG |
1633 | static int send_channel_pid_to_ust(struct ust_app *app, |
1634 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1635 | { |
1636 | int ret; | |
ffe60014 | 1637 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1638 | |
1639 | assert(app); | |
ffe60014 | 1640 | assert(ua_sess); |
4f3ab6ee | 1641 | assert(ua_chan); |
4f3ab6ee | 1642 | |
840cb59c | 1643 | health_code_update(); |
4f3ab6ee | 1644 | |
7972aab2 DG |
1645 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1646 | app->sock); | |
86acf0da | 1647 | |
ffe60014 DG |
1648 | /* Send channel to the application. */ |
1649 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
1650 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1651 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1652 | goto error; | |
1653 | } else if (ret < 0) { | |
b551a063 DG |
1654 | goto error; |
1655 | } | |
1656 | ||
d88aee68 DG |
1657 | health_code_update(); |
1658 | ||
ffe60014 DG |
1659 | /* Send all streams to application. */ |
1660 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1661 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
a7169585 MD |
1662 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1663 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1664 | goto error; | |
1665 | } else if (ret < 0) { | |
ffe60014 DG |
1666 | goto error; |
1667 | } | |
1668 | /* We don't need the stream anymore once sent to the tracer. */ | |
1669 | cds_list_del(&stream->list); | |
fb45065e | 1670 | delete_ust_app_stream(-1, stream, app); |
ffe60014 | 1671 | } |
ffe60014 DG |
1672 | /* Flag the channel that it is sent to the application. */ |
1673 | ua_chan->is_sent = 1; | |
ffe60014 | 1674 | |
b551a063 | 1675 | error: |
840cb59c | 1676 | health_code_update(); |
b551a063 DG |
1677 | return ret; |
1678 | } | |
1679 | ||
91d76f53 | 1680 | /* |
5b4a0ec0 | 1681 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1682 | * |
1683 | * Should be called with session mutex held. | |
91d76f53 | 1684 | */ |
edb67388 DG |
1685 | static |
1686 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1687 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1688 | { |
5b4a0ec0 | 1689 | int ret = 0; |
284d8f55 | 1690 | |
840cb59c | 1691 | health_code_update(); |
86acf0da | 1692 | |
5b4a0ec0 | 1693 | /* Create UST event on tracer */ |
fb45065e | 1694 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1695 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 | 1696 | &ua_event->obj); |
fb45065e | 1697 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 | 1698 | if (ret < 0) { |
ffe60014 | 1699 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
88e3c2f5 | 1700 | abort(); |
ffe60014 DG |
1701 | ERR("Error ustctl create event %s for app pid: %d with ret %d", |
1702 | ua_event->attr.name, app->pid, ret); | |
1703 | } else { | |
3757b385 DG |
1704 | /* |
1705 | * This is normal behavior, an application can die during the | |
1706 | * creation process. Don't report an error so the execution can | |
1707 | * continue normally. | |
1708 | */ | |
1709 | ret = 0; | |
ffe60014 DG |
1710 | DBG3("UST app create event failed. Application is dead."); |
1711 | } | |
5b4a0ec0 | 1712 | goto error; |
91d76f53 | 1713 | } |
f6a9efaa | 1714 | |
5b4a0ec0 | 1715 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1716 | |
5b4a0ec0 | 1717 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1718 | ua_event->attr.name, app->pid); |
f6a9efaa | 1719 | |
840cb59c | 1720 | health_code_update(); |
86acf0da | 1721 | |
025faf73 DG |
1722 | /* Set filter if one is present. */ |
1723 | if (ua_event->filter) { | |
1724 | ret = set_ust_event_filter(ua_event, app); | |
1725 | if (ret < 0) { | |
1726 | goto error; | |
1727 | } | |
1728 | } | |
1729 | ||
7cc9a73c JI |
1730 | /* Set exclusions for the event */ |
1731 | if (ua_event->exclusion) { | |
1732 | ret = set_ust_event_exclusion(ua_event, app); | |
1733 | if (ret < 0) { | |
1734 | goto error; | |
1735 | } | |
1736 | } | |
1737 | ||
8535a6d9 | 1738 | /* If event not enabled, disable it on the tracer */ |
40113787 MD |
1739 | if (ua_event->enabled) { |
1740 | /* | |
1741 | * We now need to explicitly enable the event, since it | |
1742 | * is now disabled at creation. | |
1743 | */ | |
1744 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1745 | if (ret < 0) { | |
1746 | /* | |
1747 | * If we hit an EPERM, something is wrong with our enable call. If | |
1748 | * we get an EEXIST, there is a problem on the tracer side since we | |
1749 | * just created it. | |
1750 | */ | |
1751 | switch (ret) { | |
1752 | case -LTTNG_UST_ERR_PERM: | |
1753 | /* Code flow problem */ | |
1754 | assert(0); | |
1755 | case -LTTNG_UST_ERR_EXIST: | |
1756 | /* It's OK for our use case. */ | |
1757 | ret = 0; | |
1758 | break; | |
1759 | default: | |
1760 | break; | |
1761 | } | |
1762 | goto error; | |
1763 | } | |
8535a6d9 DG |
1764 | } |
1765 | ||
5b4a0ec0 | 1766 | error: |
840cb59c | 1767 | health_code_update(); |
5b4a0ec0 | 1768 | return ret; |
91d76f53 | 1769 | } |
48842b30 | 1770 | |
5b4a0ec0 DG |
1771 | /* |
1772 | * Copy data between an UST app event and a LTT event. | |
1773 | */ | |
421cb601 | 1774 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1775 | struct ltt_ust_event *uevent) |
1776 | { | |
b4ffad32 JI |
1777 | size_t exclusion_alloc_size; |
1778 | ||
48842b30 DG |
1779 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); |
1780 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1781 | ||
fc34caaa DG |
1782 | ua_event->enabled = uevent->enabled; |
1783 | ||
5b4a0ec0 DG |
1784 | /* Copy event attributes */ |
1785 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1786 | ||
53a80697 MD |
1787 | /* Copy filter bytecode */ |
1788 | if (uevent->filter) { | |
51755dc8 | 1789 | ua_event->filter = copy_filter_bytecode(uevent->filter); |
025faf73 | 1790 | /* Filter might be NULL here in case of ENONEM. */ |
53a80697 | 1791 | } |
b4ffad32 JI |
1792 | |
1793 | /* Copy exclusion data */ | |
1794 | if (uevent->exclusion) { | |
51755dc8 | 1795 | exclusion_alloc_size = sizeof(struct lttng_event_exclusion) + |
b4ffad32 JI |
1796 | LTTNG_UST_SYM_NAME_LEN * uevent->exclusion->count; |
1797 | ua_event->exclusion = zmalloc(exclusion_alloc_size); | |
5f8df26c JI |
1798 | if (ua_event->exclusion == NULL) { |
1799 | PERROR("malloc"); | |
1800 | } else { | |
1801 | memcpy(ua_event->exclusion, uevent->exclusion, | |
1802 | exclusion_alloc_size); | |
b4ffad32 JI |
1803 | } |
1804 | } | |
48842b30 DG |
1805 | } |
1806 | ||
5b4a0ec0 DG |
1807 | /* |
1808 | * Copy data between an UST app channel and a LTT channel. | |
1809 | */ | |
421cb601 | 1810 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1811 | struct ltt_ust_channel *uchan) |
1812 | { | |
fc34caaa | 1813 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1814 | |
1815 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1816 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 1817 | |
1624d5b7 JD |
1818 | ua_chan->tracefile_size = uchan->tracefile_size; |
1819 | ua_chan->tracefile_count = uchan->tracefile_count; | |
1820 | ||
ffe60014 DG |
1821 | /* Copy event attributes since the layout is different. */ |
1822 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1823 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1824 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1825 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1826 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
e9404c27 | 1827 | ua_chan->monitor_timer_interval = uchan->monitor_timer_interval; |
ffe60014 | 1828 | ua_chan->attr.output = uchan->attr.output; |
491d1539 MD |
1829 | ua_chan->attr.blocking_timeout = uchan->attr.u.s.blocking_timeout; |
1830 | ||
ffe60014 DG |
1831 | /* |
1832 | * Note that the attribute channel type is not set since the channel on the | |
1833 | * tracing registry side does not have this information. | |
1834 | */ | |
48842b30 | 1835 | |
fc34caaa | 1836 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1837 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1838 | |
fc34caaa | 1839 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1840 | } |
1841 | ||
5b4a0ec0 DG |
1842 | /* |
1843 | * Copy data between a UST app session and a regular LTT session. | |
1844 | */ | |
421cb601 | 1845 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1846 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1847 | { |
477d7741 MD |
1848 | struct tm *timeinfo; |
1849 | char datetime[16]; | |
1850 | int ret; | |
d7ba1388 | 1851 | char tmp_shm_path[PATH_MAX]; |
477d7741 | 1852 | |
940c4592 | 1853 | timeinfo = localtime(&app->registration_time); |
477d7741 | 1854 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); |
48842b30 | 1855 | |
421cb601 | 1856 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1857 | |
7972aab2 DG |
1858 | ua_sess->tracing_id = usess->id; |
1859 | ua_sess->id = get_next_session_id(); | |
470cc211 JG |
1860 | ua_sess->real_credentials.uid = app->uid; |
1861 | ua_sess->real_credentials.gid = app->gid; | |
1862 | ua_sess->effective_credentials.uid = usess->uid; | |
1863 | ua_sess->effective_credentials.gid = usess->gid; | |
7972aab2 DG |
1864 | ua_sess->buffer_type = usess->buffer_type; |
1865 | ua_sess->bits_per_long = app->bits_per_long; | |
6addfa37 | 1866 | |
7972aab2 | 1867 | /* There is only one consumer object per session possible. */ |
6addfa37 | 1868 | consumer_output_get(usess->consumer); |
7972aab2 | 1869 | ua_sess->consumer = usess->consumer; |
6addfa37 | 1870 | |
2bba9e53 | 1871 | ua_sess->output_traces = usess->output_traces; |
ecc48a90 | 1872 | ua_sess->live_timer_interval = usess->live_timer_interval; |
84ad93e8 DG |
1873 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, |
1874 | &usess->metadata_attr); | |
7972aab2 DG |
1875 | |
1876 | switch (ua_sess->buffer_type) { | |
1877 | case LTTNG_BUFFER_PER_PID: | |
1878 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 1879 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
1880 | datetime); |
1881 | break; | |
1882 | case LTTNG_BUFFER_PER_UID: | |
1883 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
470cc211 JG |
1884 | DEFAULT_UST_TRACE_UID_PATH, |
1885 | ua_sess->real_credentials.uid, | |
1886 | app->bits_per_long); | |
7972aab2 DG |
1887 | break; |
1888 | default: | |
1889 | assert(0); | |
1890 | goto error; | |
1891 | } | |
477d7741 MD |
1892 | if (ret < 0) { |
1893 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1894 | assert(0); |
7972aab2 | 1895 | goto error; |
477d7741 MD |
1896 | } |
1897 | ||
3d071855 MD |
1898 | strncpy(ua_sess->root_shm_path, usess->root_shm_path, |
1899 | sizeof(ua_sess->root_shm_path)); | |
1900 | ua_sess->root_shm_path[sizeof(ua_sess->root_shm_path) - 1] = '\0'; | |
d7ba1388 MD |
1901 | strncpy(ua_sess->shm_path, usess->shm_path, |
1902 | sizeof(ua_sess->shm_path)); | |
1903 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
1904 | if (ua_sess->shm_path[0]) { | |
1905 | switch (ua_sess->buffer_type) { | |
1906 | case LTTNG_BUFFER_PER_PID: | |
1907 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
5da88b0f | 1908 | "/" DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", |
d7ba1388 MD |
1909 | app->name, app->pid, datetime); |
1910 | break; | |
1911 | case LTTNG_BUFFER_PER_UID: | |
1912 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
5da88b0f | 1913 | "/" DEFAULT_UST_TRACE_UID_PATH, |
d7ba1388 MD |
1914 | app->uid, app->bits_per_long); |
1915 | break; | |
1916 | default: | |
1917 | assert(0); | |
1918 | goto error; | |
1919 | } | |
1920 | if (ret < 0) { | |
1921 | PERROR("sprintf UST shadow copy session"); | |
1922 | assert(0); | |
1923 | goto error; | |
1924 | } | |
1925 | strncat(ua_sess->shm_path, tmp_shm_path, | |
1926 | sizeof(ua_sess->shm_path) - strlen(ua_sess->shm_path) - 1); | |
1927 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
1928 | } | |
6addfa37 | 1929 | return; |
7972aab2 DG |
1930 | |
1931 | error: | |
6addfa37 | 1932 | consumer_output_put(ua_sess->consumer); |
48842b30 DG |
1933 | } |
1934 | ||
78f0bacd DG |
1935 | /* |
1936 | * Lookup sesison wrapper. | |
1937 | */ | |
84cd17c6 | 1938 | static |
fb9a95c4 | 1939 | void __lookup_session_by_app(const struct ltt_ust_session *usess, |
bec39940 | 1940 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1941 | { |
1942 | /* Get right UST app session from app */ | |
d9bf3ca4 | 1943 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
1944 | } |
1945 | ||
421cb601 DG |
1946 | /* |
1947 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1948 | * id. |
421cb601 | 1949 | */ |
48842b30 | 1950 | static struct ust_app_session *lookup_session_by_app( |
fb9a95c4 | 1951 | const struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1952 | { |
bec39940 | 1953 | struct lttng_ht_iter iter; |
d9bf3ca4 | 1954 | struct lttng_ht_node_u64 *node; |
48842b30 | 1955 | |
84cd17c6 | 1956 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 1957 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
1958 | if (node == NULL) { |
1959 | goto error; | |
1960 | } | |
1961 | ||
1962 | return caa_container_of(node, struct ust_app_session, node); | |
1963 | ||
1964 | error: | |
1965 | return NULL; | |
1966 | } | |
1967 | ||
7972aab2 DG |
1968 | /* |
1969 | * Setup buffer registry per PID for the given session and application. If none | |
1970 | * is found, a new one is created, added to the global registry and | |
1971 | * initialized. If regp is valid, it's set with the newly created object. | |
1972 | * | |
1973 | * Return 0 on success or else a negative value. | |
1974 | */ | |
1975 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
1976 | struct ust_app *app, struct buffer_reg_pid **regp) | |
1977 | { | |
1978 | int ret = 0; | |
1979 | struct buffer_reg_pid *reg_pid; | |
1980 | ||
1981 | assert(ua_sess); | |
1982 | assert(app); | |
1983 | ||
1984 | rcu_read_lock(); | |
1985 | ||
1986 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
1987 | if (!reg_pid) { | |
1988 | /* | |
1989 | * This is the create channel path meaning that if there is NO | |
1990 | * registry available, we have to create one for this session. | |
1991 | */ | |
d7ba1388 | 1992 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid, |
3d071855 | 1993 | ua_sess->root_shm_path, ua_sess->shm_path); |
7972aab2 DG |
1994 | if (ret < 0) { |
1995 | goto error; | |
1996 | } | |
7972aab2 DG |
1997 | } else { |
1998 | goto end; | |
1999 | } | |
2000 | ||
2001 | /* Initialize registry. */ | |
2002 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
2003 | app->bits_per_long, app->uint8_t_alignment, | |
2004 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf | 2005 | app->uint64_t_alignment, app->long_alignment, |
470cc211 JG |
2006 | app->byte_order, app->version.major, app->version.minor, |
2007 | reg_pid->root_shm_path, reg_pid->shm_path, | |
2008 | ua_sess->effective_credentials.uid, | |
8de88061 JR |
2009 | ua_sess->effective_credentials.gid, ua_sess->tracing_id, |
2010 | app->uid); | |
7972aab2 | 2011 | if (ret < 0) { |
286c991a MD |
2012 | /* |
2013 | * reg_pid->registry->reg.ust is NULL upon error, so we need to | |
2014 | * destroy the buffer registry, because it is always expected | |
2015 | * that if the buffer registry can be found, its ust registry is | |
2016 | * non-NULL. | |
2017 | */ | |
2018 | buffer_reg_pid_destroy(reg_pid); | |
7972aab2 DG |
2019 | goto error; |
2020 | } | |
2021 | ||
286c991a MD |
2022 | buffer_reg_pid_add(reg_pid); |
2023 | ||
7972aab2 DG |
2024 | DBG3("UST app buffer registry per PID created successfully"); |
2025 | ||
2026 | end: | |
2027 | if (regp) { | |
2028 | *regp = reg_pid; | |
2029 | } | |
2030 | error: | |
2031 | rcu_read_unlock(); | |
2032 | return ret; | |
2033 | } | |
2034 | ||
2035 | /* | |
2036 | * Setup buffer registry per UID for the given session and application. If none | |
2037 | * is found, a new one is created, added to the global registry and | |
2038 | * initialized. If regp is valid, it's set with the newly created object. | |
2039 | * | |
2040 | * Return 0 on success or else a negative value. | |
2041 | */ | |
2042 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
d7ba1388 | 2043 | struct ust_app_session *ua_sess, |
7972aab2 DG |
2044 | struct ust_app *app, struct buffer_reg_uid **regp) |
2045 | { | |
2046 | int ret = 0; | |
2047 | struct buffer_reg_uid *reg_uid; | |
2048 | ||
2049 | assert(usess); | |
2050 | assert(app); | |
2051 | ||
2052 | rcu_read_lock(); | |
2053 | ||
2054 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2055 | if (!reg_uid) { | |
2056 | /* | |
2057 | * This is the create channel path meaning that if there is NO | |
2058 | * registry available, we have to create one for this session. | |
2059 | */ | |
2060 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
3d071855 MD |
2061 | LTTNG_DOMAIN_UST, ®_uid, |
2062 | ua_sess->root_shm_path, ua_sess->shm_path); | |
7972aab2 DG |
2063 | if (ret < 0) { |
2064 | goto error; | |
2065 | } | |
7972aab2 DG |
2066 | } else { |
2067 | goto end; | |
2068 | } | |
2069 | ||
2070 | /* Initialize registry. */ | |
af6142cf | 2071 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
2072 | app->bits_per_long, app->uint8_t_alignment, |
2073 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
2074 | app->uint64_t_alignment, app->long_alignment, |
2075 | app->byte_order, app->version.major, | |
3d071855 | 2076 | app->version.minor, reg_uid->root_shm_path, |
8de88061 JR |
2077 | reg_uid->shm_path, usess->uid, usess->gid, |
2078 | ua_sess->tracing_id, app->uid); | |
7972aab2 | 2079 | if (ret < 0) { |
286c991a MD |
2080 | /* |
2081 | * reg_uid->registry->reg.ust is NULL upon error, so we need to | |
2082 | * destroy the buffer registry, because it is always expected | |
2083 | * that if the buffer registry can be found, its ust registry is | |
2084 | * non-NULL. | |
2085 | */ | |
2086 | buffer_reg_uid_destroy(reg_uid, NULL); | |
7972aab2 DG |
2087 | goto error; |
2088 | } | |
2089 | /* Add node to teardown list of the session. */ | |
2090 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
2091 | ||
286c991a | 2092 | buffer_reg_uid_add(reg_uid); |
7972aab2 | 2093 | |
286c991a | 2094 | DBG3("UST app buffer registry per UID created successfully"); |
7972aab2 DG |
2095 | end: |
2096 | if (regp) { | |
2097 | *regp = reg_uid; | |
2098 | } | |
2099 | error: | |
2100 | rcu_read_unlock(); | |
2101 | return ret; | |
2102 | } | |
2103 | ||
421cb601 | 2104 | /* |
3d8ca23b | 2105 | * Create a session on the tracer side for the given app. |
421cb601 | 2106 | * |
3d8ca23b DG |
2107 | * On success, ua_sess_ptr is populated with the session pointer or else left |
2108 | * untouched. If the session was created, is_created is set to 1. On error, | |
2109 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
2110 | * be NULL. | |
2111 | * | |
2112 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
2113 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 2114 | */ |
03f91eaa | 2115 | static int find_or_create_ust_app_session(struct ltt_ust_session *usess, |
3d8ca23b DG |
2116 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, |
2117 | int *is_created) | |
421cb601 | 2118 | { |
3d8ca23b | 2119 | int ret, created = 0; |
421cb601 DG |
2120 | struct ust_app_session *ua_sess; |
2121 | ||
3d8ca23b DG |
2122 | assert(usess); |
2123 | assert(app); | |
2124 | assert(ua_sess_ptr); | |
2125 | ||
840cb59c | 2126 | health_code_update(); |
86acf0da | 2127 | |
421cb601 DG |
2128 | ua_sess = lookup_session_by_app(usess, app); |
2129 | if (ua_sess == NULL) { | |
d9bf3ca4 | 2130 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 2131 | app->pid, usess->id); |
40bbd087 | 2132 | ua_sess = alloc_ust_app_session(); |
421cb601 DG |
2133 | if (ua_sess == NULL) { |
2134 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
2135 | ret = -ENOMEM; |
2136 | goto error; | |
421cb601 | 2137 | } |
477d7741 | 2138 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 2139 | created = 1; |
421cb601 DG |
2140 | } |
2141 | ||
7972aab2 DG |
2142 | switch (usess->buffer_type) { |
2143 | case LTTNG_BUFFER_PER_PID: | |
2144 | /* Init local registry. */ | |
2145 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 2146 | if (ret < 0) { |
e64207cf | 2147 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2148 | goto error; |
2149 | } | |
2150 | break; | |
2151 | case LTTNG_BUFFER_PER_UID: | |
2152 | /* Look for a global registry. If none exists, create one. */ | |
d7ba1388 | 2153 | ret = setup_buffer_reg_uid(usess, ua_sess, app, NULL); |
7972aab2 | 2154 | if (ret < 0) { |
e64207cf | 2155 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2156 | goto error; |
2157 | } | |
2158 | break; | |
2159 | default: | |
2160 | assert(0); | |
2161 | ret = -EINVAL; | |
2162 | goto error; | |
2163 | } | |
2164 | ||
2165 | health_code_update(); | |
2166 | ||
2167 | if (ua_sess->handle == -1) { | |
fb45065e | 2168 | pthread_mutex_lock(&app->sock_lock); |
7972aab2 | 2169 | ret = ustctl_create_session(app->sock); |
fb45065e | 2170 | pthread_mutex_unlock(&app->sock_lock); |
7972aab2 DG |
2171 | if (ret < 0) { |
2172 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
2173 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
2174 | app->pid, ret); |
2175 | } else { | |
2176 | DBG("UST app creating session failed. Application is dead"); | |
3757b385 DG |
2177 | /* |
2178 | * This is normal behavior, an application can die during the | |
2179 | * creation process. Don't report an error so the execution can | |
2180 | * continue normally. This will get flagged ENOTCONN and the | |
2181 | * caller will handle it. | |
2182 | */ | |
2183 | ret = 0; | |
ffe60014 | 2184 | } |
d0b96690 | 2185 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
2186 | if (ret != -ENOMEM) { |
2187 | /* | |
2188 | * Tracer is probably gone or got an internal error so let's | |
2189 | * behave like it will soon unregister or not usable. | |
2190 | */ | |
2191 | ret = -ENOTCONN; | |
2192 | } | |
2193 | goto error; | |
421cb601 DG |
2194 | } |
2195 | ||
7972aab2 DG |
2196 | ua_sess->handle = ret; |
2197 | ||
2198 | /* Add ust app session to app's HT */ | |
d9bf3ca4 MD |
2199 | lttng_ht_node_init_u64(&ua_sess->node, |
2200 | ua_sess->tracing_id); | |
2201 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
10b56aef MD |
2202 | lttng_ht_node_init_ulong(&ua_sess->ust_objd_node, ua_sess->handle); |
2203 | lttng_ht_add_unique_ulong(app->ust_sessions_objd, | |
2204 | &ua_sess->ust_objd_node); | |
7972aab2 DG |
2205 | |
2206 | DBG2("UST app session created successfully with handle %d", ret); | |
2207 | } | |
2208 | ||
2209 | *ua_sess_ptr = ua_sess; | |
2210 | if (is_created) { | |
2211 | *is_created = created; | |
2212 | } | |
2213 | ||
2214 | /* Everything went well. */ | |
2215 | ret = 0; | |
2216 | ||
2217 | error: | |
2218 | health_code_update(); | |
2219 | return ret; | |
2220 | } | |
2221 | ||
6a6b2068 JG |
2222 | /* |
2223 | * Match function for a hash table lookup of ust_app_ctx. | |
2224 | * | |
2225 | * It matches an ust app context based on the context type and, in the case | |
2226 | * of perf counters, their name. | |
2227 | */ | |
2228 | static int ht_match_ust_app_ctx(struct cds_lfht_node *node, const void *_key) | |
2229 | { | |
2230 | struct ust_app_ctx *ctx; | |
bdf64013 | 2231 | const struct lttng_ust_context_attr *key; |
6a6b2068 JG |
2232 | |
2233 | assert(node); | |
2234 | assert(_key); | |
2235 | ||
2236 | ctx = caa_container_of(node, struct ust_app_ctx, node.node); | |
2237 | key = _key; | |
2238 | ||
2239 | /* Context type */ | |
2240 | if (ctx->ctx.ctx != key->ctx) { | |
2241 | goto no_match; | |
2242 | } | |
2243 | ||
bdf64013 JG |
2244 | switch(key->ctx) { |
2245 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: | |
6a6b2068 | 2246 | if (strncmp(key->u.perf_counter.name, |
bdf64013 JG |
2247 | ctx->ctx.u.perf_counter.name, |
2248 | sizeof(key->u.perf_counter.name))) { | |
2249 | goto no_match; | |
2250 | } | |
2251 | break; | |
2252 | case LTTNG_UST_CONTEXT_APP_CONTEXT: | |
2253 | if (strcmp(key->u.app_ctx.provider_name, | |
2254 | ctx->ctx.u.app_ctx.provider_name) || | |
2255 | strcmp(key->u.app_ctx.ctx_name, | |
2256 | ctx->ctx.u.app_ctx.ctx_name)) { | |
6a6b2068 JG |
2257 | goto no_match; |
2258 | } | |
bdf64013 JG |
2259 | break; |
2260 | default: | |
2261 | break; | |
6a6b2068 JG |
2262 | } |
2263 | ||
2264 | /* Match. */ | |
2265 | return 1; | |
2266 | ||
2267 | no_match: | |
2268 | return 0; | |
2269 | } | |
2270 | ||
2271 | /* | |
2272 | * Lookup for an ust app context from an lttng_ust_context. | |
2273 | * | |
be184a0f | 2274 | * Must be called while holding RCU read side lock. |
6a6b2068 JG |
2275 | * Return an ust_app_ctx object or NULL on error. |
2276 | */ | |
2277 | static | |
2278 | struct ust_app_ctx *find_ust_app_context(struct lttng_ht *ht, | |
bdf64013 | 2279 | struct lttng_ust_context_attr *uctx) |
6a6b2068 JG |
2280 | { |
2281 | struct lttng_ht_iter iter; | |
2282 | struct lttng_ht_node_ulong *node; | |
2283 | struct ust_app_ctx *app_ctx = NULL; | |
2284 | ||
2285 | assert(uctx); | |
2286 | assert(ht); | |
2287 | ||
2288 | /* Lookup using the lttng_ust_context_type and a custom match fct. */ | |
2289 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) uctx->ctx, lttng_ht_seed), | |
2290 | ht_match_ust_app_ctx, uctx, &iter.iter); | |
2291 | node = lttng_ht_iter_get_node_ulong(&iter); | |
2292 | if (!node) { | |
2293 | goto end; | |
2294 | } | |
2295 | ||
2296 | app_ctx = caa_container_of(node, struct ust_app_ctx, node); | |
2297 | ||
2298 | end: | |
2299 | return app_ctx; | |
2300 | } | |
2301 | ||
7972aab2 DG |
2302 | /* |
2303 | * Create a context for the channel on the tracer. | |
2304 | * | |
2305 | * Called with UST app session lock held and a RCU read side lock. | |
2306 | */ | |
2307 | static | |
c9edf082 | 2308 | int create_ust_app_channel_context(struct ust_app_channel *ua_chan, |
bdf64013 | 2309 | struct lttng_ust_context_attr *uctx, |
7972aab2 DG |
2310 | struct ust_app *app) |
2311 | { | |
2312 | int ret = 0; | |
7972aab2 DG |
2313 | struct ust_app_ctx *ua_ctx; |
2314 | ||
2315 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
2316 | ||
6a6b2068 JG |
2317 | ua_ctx = find_ust_app_context(ua_chan->ctx, uctx); |
2318 | if (ua_ctx) { | |
7972aab2 DG |
2319 | ret = -EEXIST; |
2320 | goto error; | |
2321 | } | |
2322 | ||
2323 | ua_ctx = alloc_ust_app_ctx(uctx); | |
2324 | if (ua_ctx == NULL) { | |
2325 | /* malloc failed */ | |
7682f304 | 2326 | ret = -ENOMEM; |
7972aab2 DG |
2327 | goto error; |
2328 | } | |
2329 | ||
2330 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 2331 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 2332 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
2333 | |
2334 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
2335 | if (ret < 0) { | |
2336 | goto error; | |
2337 | } | |
2338 | ||
2339 | error: | |
2340 | return ret; | |
2341 | } | |
2342 | ||
2343 | /* | |
2344 | * Enable on the tracer side a ust app event for the session and channel. | |
2345 | * | |
2346 | * Called with UST app session lock held. | |
2347 | */ | |
2348 | static | |
2349 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
2350 | struct ust_app_event *ua_event, struct ust_app *app) | |
2351 | { | |
2352 | int ret; | |
2353 | ||
2354 | ret = enable_ust_event(app, ua_sess, ua_event); | |
2355 | if (ret < 0) { | |
2356 | goto error; | |
2357 | } | |
2358 | ||
2359 | ua_event->enabled = 1; | |
2360 | ||
2361 | error: | |
2362 | return ret; | |
2363 | } | |
2364 | ||
2365 | /* | |
2366 | * Disable on the tracer side a ust app event for the session and channel. | |
2367 | */ | |
2368 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
2369 | struct ust_app_event *ua_event, struct ust_app *app) | |
2370 | { | |
2371 | int ret; | |
2372 | ||
2373 | ret = disable_ust_event(app, ua_sess, ua_event); | |
2374 | if (ret < 0) { | |
2375 | goto error; | |
2376 | } | |
2377 | ||
2378 | ua_event->enabled = 0; | |
2379 | ||
2380 | error: | |
2381 | return ret; | |
2382 | } | |
2383 | ||
2384 | /* | |
2385 | * Lookup ust app channel for session and disable it on the tracer side. | |
2386 | */ | |
2387 | static | |
2388 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
2389 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
2390 | { | |
2391 | int ret; | |
2392 | ||
2393 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2394 | if (ret < 0) { | |
2395 | goto error; | |
2396 | } | |
2397 | ||
2398 | ua_chan->enabled = 0; | |
2399 | ||
2400 | error: | |
2401 | return ret; | |
2402 | } | |
2403 | ||
2404 | /* | |
2405 | * Lookup ust app channel for session and enable it on the tracer side. This | |
2406 | * MUST be called with a RCU read side lock acquired. | |
2407 | */ | |
2408 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
2409 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
2410 | { | |
2411 | int ret = 0; | |
2412 | struct lttng_ht_iter iter; | |
2413 | struct lttng_ht_node_str *ua_chan_node; | |
2414 | struct ust_app_channel *ua_chan; | |
2415 | ||
2416 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
2417 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
2418 | if (ua_chan_node == NULL) { | |
d9bf3ca4 | 2419 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
2420 | uchan->name, ua_sess->tracing_id); |
2421 | goto error; | |
2422 | } | |
2423 | ||
2424 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2425 | ||
2426 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
2427 | if (ret < 0) { | |
2428 | goto error; | |
2429 | } | |
2430 | ||
2431 | error: | |
2432 | return ret; | |
2433 | } | |
2434 | ||
2435 | /* | |
2436 | * Ask the consumer to create a channel and get it if successful. | |
2437 | * | |
fad1ed2f JR |
2438 | * Called with UST app session lock held. |
2439 | * | |
7972aab2 DG |
2440 | * Return 0 on success or else a negative value. |
2441 | */ | |
2442 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
2443 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
e098433c JG |
2444 | int bitness, struct ust_registry_session *registry, |
2445 | uint64_t trace_archive_id) | |
7972aab2 DG |
2446 | { |
2447 | int ret; | |
2448 | unsigned int nb_fd = 0; | |
2449 | struct consumer_socket *socket; | |
2450 | ||
2451 | assert(usess); | |
2452 | assert(ua_sess); | |
2453 | assert(ua_chan); | |
2454 | assert(registry); | |
2455 | ||
2456 | rcu_read_lock(); | |
2457 | health_code_update(); | |
2458 | ||
2459 | /* Get the right consumer socket for the application. */ | |
2460 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
2461 | if (!socket) { | |
2462 | ret = -EINVAL; | |
2463 | goto error; | |
2464 | } | |
2465 | ||
2466 | health_code_update(); | |
2467 | ||
2468 | /* Need one fd for the channel. */ | |
2469 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2470 | if (ret < 0) { | |
2471 | ERR("Exhausted number of available FD upon create channel"); | |
2472 | goto error; | |
2473 | } | |
2474 | ||
2475 | /* | |
2476 | * Ask consumer to create channel. The consumer will return the number of | |
2477 | * stream we have to expect. | |
2478 | */ | |
2479 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
d2956687 | 2480 | registry, usess->current_trace_chunk); |
7972aab2 DG |
2481 | if (ret < 0) { |
2482 | goto error_ask; | |
2483 | } | |
2484 | ||
2485 | /* | |
2486 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2487 | * stream (2 being the default value here). | |
2488 | */ | |
2489 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2490 | ||
2491 | /* Reserve the amount of file descriptor we need. */ | |
2492 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2493 | if (ret < 0) { | |
2494 | ERR("Exhausted number of available FD upon create channel"); | |
2495 | goto error_fd_get_stream; | |
2496 | } | |
2497 | ||
2498 | health_code_update(); | |
2499 | ||
2500 | /* | |
2501 | * Now get the channel from the consumer. This call wil populate the stream | |
2502 | * list of that channel and set the ust objects. | |
2503 | */ | |
d9078d0c DG |
2504 | if (usess->consumer->enabled) { |
2505 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2506 | if (ret < 0) { | |
2507 | goto error_destroy; | |
2508 | } | |
7972aab2 DG |
2509 | } |
2510 | ||
2511 | rcu_read_unlock(); | |
2512 | return 0; | |
2513 | ||
2514 | error_destroy: | |
2515 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2516 | error_fd_get_stream: | |
2517 | /* | |
2518 | * Initiate a destroy channel on the consumer since we had an error | |
2519 | * handling it on our side. The return value is of no importance since we | |
2520 | * already have a ret value set by the previous error that we need to | |
2521 | * return. | |
2522 | */ | |
2523 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2524 | error_ask: | |
2525 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2526 | error: | |
2527 | health_code_update(); | |
2528 | rcu_read_unlock(); | |
2529 | return ret; | |
2530 | } | |
2531 | ||
2532 | /* | |
2533 | * Duplicate the ust data object of the ust app stream and save it in the | |
2534 | * buffer registry stream. | |
2535 | * | |
2536 | * Return 0 on success or else a negative value. | |
2537 | */ | |
2538 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2539 | struct ust_app_stream *stream) | |
2540 | { | |
2541 | int ret; | |
2542 | ||
2543 | assert(reg_stream); | |
2544 | assert(stream); | |
2545 | ||
2546 | /* Reserve the amount of file descriptor we need. */ | |
2547 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2548 | if (ret < 0) { | |
2549 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2550 | goto error; | |
2551 | } | |
2552 | ||
2553 | /* Duplicate object for stream once the original is in the registry. */ | |
2554 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2555 | reg_stream->obj.ust); | |
2556 | if (ret < 0) { | |
2557 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2558 | reg_stream->obj.ust, stream->obj, ret); | |
2559 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2560 | goto error; | |
2561 | } | |
2562 | stream->handle = stream->obj->handle; | |
2563 | ||
2564 | error: | |
2565 | return ret; | |
2566 | } | |
2567 | ||
2568 | /* | |
2569 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2570 | * buffer registry channel. | |
2571 | * | |
2572 | * Return 0 on success or else a negative value. | |
2573 | */ | |
2574 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2575 | struct ust_app_channel *ua_chan) | |
2576 | { | |
2577 | int ret; | |
2578 | ||
2579 | assert(reg_chan); | |
2580 | assert(ua_chan); | |
2581 | ||
2582 | /* Need two fds for the channel. */ | |
2583 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2584 | if (ret < 0) { | |
2585 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2586 | goto error_fd_get; | |
2587 | } | |
2588 | ||
2589 | /* Duplicate object for stream once the original is in the registry. */ | |
2590 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2591 | if (ret < 0) { | |
2592 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2593 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2594 | goto error; | |
2595 | } | |
2596 | ua_chan->handle = ua_chan->obj->handle; | |
2597 | ||
2598 | return 0; | |
2599 | ||
2600 | error: | |
2601 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2602 | error_fd_get: | |
2603 | return ret; | |
2604 | } | |
2605 | ||
2606 | /* | |
2607 | * For a given channel buffer registry, setup all streams of the given ust | |
2608 | * application channel. | |
2609 | * | |
2610 | * Return 0 on success or else a negative value. | |
2611 | */ | |
2612 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
fb45065e MD |
2613 | struct ust_app_channel *ua_chan, |
2614 | struct ust_app *app) | |
7972aab2 DG |
2615 | { |
2616 | int ret = 0; | |
2617 | struct ust_app_stream *stream, *stmp; | |
2618 | ||
2619 | assert(reg_chan); | |
2620 | assert(ua_chan); | |
2621 | ||
2622 | DBG2("UST app setup buffer registry stream"); | |
2623 | ||
2624 | /* Send all streams to application. */ | |
2625 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2626 | struct buffer_reg_stream *reg_stream; | |
2627 | ||
2628 | ret = buffer_reg_stream_create(®_stream); | |
2629 | if (ret < 0) { | |
2630 | goto error; | |
2631 | } | |
2632 | ||
2633 | /* | |
2634 | * Keep original pointer and nullify it in the stream so the delete | |
2635 | * stream call does not release the object. | |
2636 | */ | |
2637 | reg_stream->obj.ust = stream->obj; | |
2638 | stream->obj = NULL; | |
2639 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2640 | |
7972aab2 DG |
2641 | /* We don't need the streams anymore. */ |
2642 | cds_list_del(&stream->list); | |
fb45065e | 2643 | delete_ust_app_stream(-1, stream, app); |
7972aab2 | 2644 | } |
421cb601 | 2645 | |
7972aab2 DG |
2646 | error: |
2647 | return ret; | |
2648 | } | |
2649 | ||
2650 | /* | |
2651 | * Create a buffer registry channel for the given session registry and | |
2652 | * application channel object. If regp pointer is valid, it's set with the | |
2653 | * created object. Important, the created object is NOT added to the session | |
2654 | * registry hash table. | |
2655 | * | |
2656 | * Return 0 on success else a negative value. | |
2657 | */ | |
2658 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2659 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2660 | { | |
2661 | int ret; | |
2662 | struct buffer_reg_channel *reg_chan = NULL; | |
2663 | ||
2664 | assert(reg_sess); | |
2665 | assert(ua_chan); | |
2666 | ||
2667 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2668 | ||
2669 | /* Create buffer registry channel. */ | |
2670 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2671 | if (ret < 0) { | |
2672 | goto error_create; | |
421cb601 | 2673 | } |
7972aab2 DG |
2674 | assert(reg_chan); |
2675 | reg_chan->consumer_key = ua_chan->key; | |
8c924c7b | 2676 | reg_chan->subbuf_size = ua_chan->attr.subbuf_size; |
d07ceecd | 2677 | reg_chan->num_subbuf = ua_chan->attr.num_subbuf; |
421cb601 | 2678 | |
7972aab2 DG |
2679 | /* Create and add a channel registry to session. */ |
2680 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2681 | ua_chan->tracing_channel_id); | |
2682 | if (ret < 0) { | |
2683 | goto error; | |
d88aee68 | 2684 | } |
7972aab2 | 2685 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2686 | |
7972aab2 DG |
2687 | if (regp) { |
2688 | *regp = reg_chan; | |
3d8ca23b | 2689 | } |
d88aee68 | 2690 | |
7972aab2 | 2691 | return 0; |
3d8ca23b DG |
2692 | |
2693 | error: | |
7972aab2 DG |
2694 | /* Safe because the registry channel object was not added to any HT. */ |
2695 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2696 | error_create: | |
3d8ca23b | 2697 | return ret; |
421cb601 DG |
2698 | } |
2699 | ||
55cc08a6 | 2700 | /* |
7972aab2 DG |
2701 | * Setup buffer registry channel for the given session registry and application |
2702 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2703 | * |
7972aab2 | 2704 | * Return 0 on success else a negative value. |
55cc08a6 | 2705 | */ |
7972aab2 | 2706 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
fb45065e MD |
2707 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan, |
2708 | struct ust_app *app) | |
55cc08a6 | 2709 | { |
7972aab2 | 2710 | int ret; |
55cc08a6 | 2711 | |
7972aab2 DG |
2712 | assert(reg_sess); |
2713 | assert(reg_chan); | |
2714 | assert(ua_chan); | |
2715 | assert(ua_chan->obj); | |
55cc08a6 | 2716 | |
7972aab2 | 2717 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2718 | |
7972aab2 | 2719 | /* Setup all streams for the registry. */ |
fb45065e | 2720 | ret = setup_buffer_reg_streams(reg_chan, ua_chan, app); |
7972aab2 | 2721 | if (ret < 0) { |
55cc08a6 DG |
2722 | goto error; |
2723 | } | |
2724 | ||
7972aab2 DG |
2725 | reg_chan->obj.ust = ua_chan->obj; |
2726 | ua_chan->obj = NULL; | |
55cc08a6 | 2727 | |
7972aab2 | 2728 | return 0; |
55cc08a6 DG |
2729 | |
2730 | error: | |
7972aab2 DG |
2731 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2732 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2733 | return ret; |
2734 | } | |
2735 | ||
edb67388 | 2736 | /* |
7972aab2 | 2737 | * Send buffer registry channel to the application. |
d0b96690 | 2738 | * |
7972aab2 | 2739 | * Return 0 on success else a negative value. |
edb67388 | 2740 | */ |
7972aab2 DG |
2741 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2742 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2743 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2744 | { |
2745 | int ret; | |
7972aab2 | 2746 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2747 | |
7972aab2 DG |
2748 | assert(reg_chan); |
2749 | assert(app); | |
2750 | assert(ua_sess); | |
2751 | assert(ua_chan); | |
2752 | ||
2753 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2754 | ||
2755 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2756 | if (ret < 0) { |
2757 | goto error; | |
2758 | } | |
2759 | ||
7972aab2 DG |
2760 | /* Send channel to the application. */ |
2761 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
2762 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
2763 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
2764 | goto error; | |
2765 | } else if (ret < 0) { | |
7972aab2 DG |
2766 | goto error; |
2767 | } | |
2768 | ||
2769 | health_code_update(); | |
2770 | ||
2771 | /* Send all streams to application. */ | |
2772 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2773 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2774 | struct ust_app_stream stream; | |
2775 | ||
2776 | ret = duplicate_stream_object(reg_stream, &stream); | |
2777 | if (ret < 0) { | |
2778 | goto error_stream_unlock; | |
2779 | } | |
2780 | ||
2781 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2782 | if (ret < 0) { | |
fb45065e | 2783 | (void) release_ust_app_stream(-1, &stream, app); |
a7169585 MD |
2784 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
2785 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
a7169585 | 2786 | } |
7972aab2 DG |
2787 | goto error_stream_unlock; |
2788 | } | |
edb67388 | 2789 | |
7972aab2 DG |
2790 | /* |
2791 | * The return value is not important here. This function will output an | |
2792 | * error if needed. | |
2793 | */ | |
fb45065e | 2794 | (void) release_ust_app_stream(-1, &stream, app); |
7972aab2 DG |
2795 | } |
2796 | ua_chan->is_sent = 1; | |
2797 | ||
2798 | error_stream_unlock: | |
2799 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2800 | error: |
2801 | return ret; | |
2802 | } | |
2803 | ||
9730260e | 2804 | /* |
7972aab2 DG |
2805 | * Create and send to the application the created buffers with per UID buffers. |
2806 | * | |
9acdc1d6 | 2807 | * This MUST be called with a RCU read side lock acquired. |
71e0a100 | 2808 | * The session list lock and the session's lock must be acquired. |
9acdc1d6 | 2809 | * |
7972aab2 | 2810 | * Return 0 on success else a negative value. |
9730260e | 2811 | */ |
7972aab2 DG |
2812 | static int create_channel_per_uid(struct ust_app *app, |
2813 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2814 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2815 | { |
2816 | int ret; | |
7972aab2 DG |
2817 | struct buffer_reg_uid *reg_uid; |
2818 | struct buffer_reg_channel *reg_chan; | |
e32d7f27 | 2819 | struct ltt_session *session = NULL; |
e098433c JG |
2820 | enum lttng_error_code notification_ret; |
2821 | struct ust_registry_channel *chan_reg; | |
9730260e | 2822 | |
7972aab2 DG |
2823 | assert(app); |
2824 | assert(usess); | |
2825 | assert(ua_sess); | |
2826 | assert(ua_chan); | |
2827 | ||
2828 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2829 | ||
2830 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2831 | /* | |
2832 | * The session creation handles the creation of this global registry | |
2833 | * object. If none can be find, there is a code flow problem or a | |
2834 | * teardown race. | |
2835 | */ | |
2836 | assert(reg_uid); | |
2837 | ||
2838 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2839 | reg_uid); | |
2721f7ea JG |
2840 | if (reg_chan) { |
2841 | goto send_channel; | |
2842 | } | |
7972aab2 | 2843 | |
2721f7ea JG |
2844 | /* Create the buffer registry channel object. */ |
2845 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2846 | if (ret < 0) { | |
2847 | ERR("Error creating the UST channel \"%s\" registry instance", | |
f14256d6 | 2848 | ua_chan->name); |
2721f7ea JG |
2849 | goto error; |
2850 | } | |
f14256d6 | 2851 | |
e098433c JG |
2852 | session = session_find_by_id(ua_sess->tracing_id); |
2853 | assert(session); | |
2854 | assert(pthread_mutex_trylock(&session->lock)); | |
2855 | assert(session_trylock_list()); | |
2856 | ||
2721f7ea JG |
2857 | /* |
2858 | * Create the buffers on the consumer side. This call populates the | |
2859 | * ust app channel object with all streams and data object. | |
2860 | */ | |
2861 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
e098433c | 2862 | app->bits_per_long, reg_uid->registry->reg.ust, |
d2956687 | 2863 | session->most_recent_chunk_id.value); |
2721f7ea JG |
2864 | if (ret < 0) { |
2865 | ERR("Error creating UST channel \"%s\" on the consumer daemon", | |
2866 | ua_chan->name); | |
7972aab2 DG |
2867 | |
2868 | /* | |
2721f7ea JG |
2869 | * Let's remove the previously created buffer registry channel so |
2870 | * it's not visible anymore in the session registry. | |
7972aab2 | 2871 | */ |
2721f7ea JG |
2872 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, |
2873 | ua_chan->tracing_channel_id, false); | |
2874 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
2875 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2876 | goto error; | |
7972aab2 DG |
2877 | } |
2878 | ||
2721f7ea JG |
2879 | /* |
2880 | * Setup the streams and add it to the session registry. | |
2881 | */ | |
2882 | ret = setup_buffer_reg_channel(reg_uid->registry, | |
2883 | ua_chan, reg_chan, app); | |
2884 | if (ret < 0) { | |
2885 | ERR("Error setting up UST channel \"%s\"", ua_chan->name); | |
2886 | goto error; | |
2887 | } | |
2888 | ||
e098433c JG |
2889 | /* Notify the notification subsystem of the channel's creation. */ |
2890 | pthread_mutex_lock(®_uid->registry->reg.ust->lock); | |
2891 | chan_reg = ust_registry_channel_find(reg_uid->registry->reg.ust, | |
2892 | ua_chan->tracing_channel_id); | |
2893 | assert(chan_reg); | |
2894 | chan_reg->consumer_key = ua_chan->key; | |
2895 | chan_reg = NULL; | |
2896 | pthread_mutex_unlock(®_uid->registry->reg.ust->lock); | |
e9404c27 | 2897 | |
e098433c JG |
2898 | notification_ret = notification_thread_command_add_channel( |
2899 | notification_thread_handle, session->name, | |
470cc211 JG |
2900 | ua_sess->effective_credentials.uid, |
2901 | ua_sess->effective_credentials.gid, ua_chan->name, | |
2902 | ua_chan->key, LTTNG_DOMAIN_UST, | |
e098433c JG |
2903 | ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf); |
2904 | if (notification_ret != LTTNG_OK) { | |
2905 | ret = - (int) notification_ret; | |
2906 | ERR("Failed to add channel to notification thread"); | |
2907 | goto error; | |
e9404c27 JG |
2908 | } |
2909 | ||
2721f7ea | 2910 | send_channel: |
66ff8e3f JG |
2911 | /* Send buffers to the application. */ |
2912 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
2913 | if (ret < 0) { | |
2914 | if (ret != -ENOTCONN) { | |
2915 | ERR("Error sending channel to application"); | |
2916 | } | |
2917 | goto error; | |
2918 | } | |
2919 | ||
9730260e | 2920 | error: |
e32d7f27 JG |
2921 | if (session) { |
2922 | session_put(session); | |
2923 | } | |
9730260e DG |
2924 | return ret; |
2925 | } | |
2926 | ||
78f0bacd | 2927 | /* |
7972aab2 DG |
2928 | * Create and send to the application the created buffers with per PID buffers. |
2929 | * | |
fad1ed2f | 2930 | * Called with UST app session lock held. |
71e0a100 | 2931 | * The session list lock and the session's lock must be acquired. |
fad1ed2f | 2932 | * |
7972aab2 | 2933 | * Return 0 on success else a negative value. |
78f0bacd | 2934 | */ |
7972aab2 DG |
2935 | static int create_channel_per_pid(struct ust_app *app, |
2936 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2937 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2938 | { |
8535a6d9 | 2939 | int ret; |
7972aab2 | 2940 | struct ust_registry_session *registry; |
e9404c27 | 2941 | enum lttng_error_code cmd_ret; |
e32d7f27 | 2942 | struct ltt_session *session = NULL; |
e9404c27 JG |
2943 | uint64_t chan_reg_key; |
2944 | struct ust_registry_channel *chan_reg; | |
78f0bacd | 2945 | |
7972aab2 DG |
2946 | assert(app); |
2947 | assert(usess); | |
2948 | assert(ua_sess); | |
2949 | assert(ua_chan); | |
2950 | ||
2951 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2952 | ||
2953 | rcu_read_lock(); | |
2954 | ||
2955 | registry = get_session_registry(ua_sess); | |
fad1ed2f | 2956 | /* The UST app session lock is held, registry shall not be null. */ |
7972aab2 DG |
2957 | assert(registry); |
2958 | ||
2959 | /* Create and add a new channel registry to session. */ | |
2960 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd | 2961 | if (ret < 0) { |
f14256d6 MD |
2962 | ERR("Error creating the UST channel \"%s\" registry instance", |
2963 | ua_chan->name); | |
78f0bacd DG |
2964 | goto error; |
2965 | } | |
2966 | ||
e098433c JG |
2967 | session = session_find_by_id(ua_sess->tracing_id); |
2968 | assert(session); | |
2969 | ||
2970 | assert(pthread_mutex_trylock(&session->lock)); | |
2971 | assert(session_trylock_list()); | |
2972 | ||
7972aab2 DG |
2973 | /* Create and get channel on the consumer side. */ |
2974 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
e098433c | 2975 | app->bits_per_long, registry, |
d2956687 | 2976 | session->most_recent_chunk_id.value); |
7972aab2 | 2977 | if (ret < 0) { |
f14256d6 MD |
2978 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
2979 | ua_chan->name); | |
5b951542 | 2980 | goto error_remove_from_registry; |
7972aab2 DG |
2981 | } |
2982 | ||
2983 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
2984 | if (ret < 0) { | |
a7169585 MD |
2985 | if (ret != -ENOTCONN) { |
2986 | ERR("Error sending channel to application"); | |
2987 | } | |
5b951542 | 2988 | goto error_remove_from_registry; |
7972aab2 | 2989 | } |
8535a6d9 | 2990 | |
e9404c27 JG |
2991 | chan_reg_key = ua_chan->key; |
2992 | pthread_mutex_lock(®istry->lock); | |
2993 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
2994 | assert(chan_reg); | |
2995 | chan_reg->consumer_key = ua_chan->key; | |
2996 | pthread_mutex_unlock(®istry->lock); | |
2997 | ||
2998 | cmd_ret = notification_thread_command_add_channel( | |
2999 | notification_thread_handle, session->name, | |
470cc211 JG |
3000 | ua_sess->effective_credentials.uid, |
3001 | ua_sess->effective_credentials.gid, ua_chan->name, | |
3002 | ua_chan->key, LTTNG_DOMAIN_UST, | |
e9404c27 JG |
3003 | ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf); |
3004 | if (cmd_ret != LTTNG_OK) { | |
3005 | ret = - (int) cmd_ret; | |
3006 | ERR("Failed to add channel to notification thread"); | |
5b951542 | 3007 | goto error_remove_from_registry; |
e9404c27 JG |
3008 | } |
3009 | ||
5b951542 MD |
3010 | error_remove_from_registry: |
3011 | if (ret) { | |
3012 | ust_registry_channel_del_free(registry, ua_chan->key, false); | |
3013 | } | |
78f0bacd | 3014 | error: |
7972aab2 | 3015 | rcu_read_unlock(); |
e32d7f27 JG |
3016 | if (session) { |
3017 | session_put(session); | |
3018 | } | |
78f0bacd DG |
3019 | return ret; |
3020 | } | |
3021 | ||
3022 | /* | |
7972aab2 | 3023 | * From an already allocated ust app channel, create the channel buffers if |
88e3c2f5 | 3024 | * needed and send them to the application. This MUST be called with a RCU read |
7972aab2 DG |
3025 | * side lock acquired. |
3026 | * | |
fad1ed2f JR |
3027 | * Called with UST app session lock held. |
3028 | * | |
a7169585 MD |
3029 | * Return 0 on success or else a negative value. Returns -ENOTCONN if |
3030 | * the application exited concurrently. | |
78f0bacd | 3031 | */ |
88e3c2f5 | 3032 | static int ust_app_channel_send(struct ust_app *app, |
7972aab2 DG |
3033 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, |
3034 | struct ust_app_channel *ua_chan) | |
78f0bacd | 3035 | { |
7972aab2 | 3036 | int ret; |
78f0bacd | 3037 | |
7972aab2 DG |
3038 | assert(app); |
3039 | assert(usess); | |
88e3c2f5 | 3040 | assert(usess->active); |
7972aab2 DG |
3041 | assert(ua_sess); |
3042 | assert(ua_chan); | |
3043 | ||
3044 | /* Handle buffer type before sending the channel to the application. */ | |
3045 | switch (usess->buffer_type) { | |
3046 | case LTTNG_BUFFER_PER_UID: | |
3047 | { | |
3048 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
3049 | if (ret < 0) { | |
3050 | goto error; | |
3051 | } | |
3052 | break; | |
3053 | } | |
3054 | case LTTNG_BUFFER_PER_PID: | |
3055 | { | |
3056 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
3057 | if (ret < 0) { | |
3058 | goto error; | |
3059 | } | |
3060 | break; | |
3061 | } | |
3062 | default: | |
3063 | assert(0); | |
3064 | ret = -EINVAL; | |
78f0bacd DG |
3065 | goto error; |
3066 | } | |
3067 | ||
7972aab2 DG |
3068 | /* Initialize ust objd object using the received handle and add it. */ |
3069 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
3070 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 3071 | |
7972aab2 DG |
3072 | /* If channel is not enabled, disable it on the tracer */ |
3073 | if (!ua_chan->enabled) { | |
3074 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
3075 | if (ret < 0) { | |
3076 | goto error; | |
3077 | } | |
78f0bacd DG |
3078 | } |
3079 | ||
3080 | error: | |
3081 | return ret; | |
3082 | } | |
3083 | ||
284d8f55 | 3084 | /* |
88e3c2f5 | 3085 | * Create UST app channel and return it through ua_chanp if not NULL. |
d0b96690 | 3086 | * |
36b588ed | 3087 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 | 3088 | * |
88e3c2f5 | 3089 | * Return 0 on success or else a negative value. |
284d8f55 | 3090 | */ |
88e3c2f5 JG |
3091 | static int ust_app_channel_allocate(struct ust_app_session *ua_sess, |
3092 | struct ltt_ust_channel *uchan, | |
7972aab2 | 3093 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 3094 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
3095 | { |
3096 | int ret = 0; | |
bec39940 DG |
3097 | struct lttng_ht_iter iter; |
3098 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
3099 | struct ust_app_channel *ua_chan; |
3100 | ||
3101 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3102 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
3103 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 3104 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 3105 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 3106 | goto end; |
5b4a0ec0 DG |
3107 | } |
3108 | ||
d0b96690 | 3109 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
3110 | if (ua_chan == NULL) { |
3111 | /* Only malloc can fail here */ | |
4d710ac2 | 3112 | ret = -ENOMEM; |
88e3c2f5 | 3113 | goto error; |
fc34caaa DG |
3114 | } |
3115 | shadow_copy_channel(ua_chan, uchan); | |
3116 | ||
ffe60014 DG |
3117 | /* Set channel type. */ |
3118 | ua_chan->attr.type = type; | |
3119 | ||
d0b96690 DG |
3120 | /* Only add the channel if successful on the tracer side. */ |
3121 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
fc34caaa | 3122 | end: |
4d710ac2 DG |
3123 | if (ua_chanp) { |
3124 | *ua_chanp = ua_chan; | |
3125 | } | |
3126 | ||
3127 | /* Everything went well. */ | |
3128 | return 0; | |
5b4a0ec0 DG |
3129 | |
3130 | error: | |
4d710ac2 | 3131 | return ret; |
5b4a0ec0 DG |
3132 | } |
3133 | ||
3134 | /* | |
3135 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
3136 | * |
3137 | * Called with ust app session mutex held. | |
5b4a0ec0 | 3138 | */ |
edb67388 DG |
3139 | static |
3140 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
3141 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
3142 | struct ust_app *app) | |
284d8f55 | 3143 | { |
edb67388 | 3144 | int ret = 0; |
5b4a0ec0 | 3145 | struct ust_app_event *ua_event; |
284d8f55 | 3146 | |
edb67388 DG |
3147 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
3148 | if (ua_event == NULL) { | |
20533947 | 3149 | /* Only failure mode of alloc_ust_app_event(). */ |
edb67388 | 3150 | ret = -ENOMEM; |
fc34caaa | 3151 | goto end; |
5b4a0ec0 | 3152 | } |
edb67388 | 3153 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 3154 | |
edb67388 | 3155 | /* Create it on the tracer side */ |
5b4a0ec0 | 3156 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 3157 | if (ret < 0) { |
e9f11505 JG |
3158 | /* |
3159 | * Not found previously means that it does not exist on the | |
3160 | * tracer. If the application reports that the event existed, | |
3161 | * it means there is a bug in the sessiond or lttng-ust | |
3162 | * (or corruption, etc.) | |
3163 | */ | |
3164 | if (ret == -LTTNG_UST_ERR_EXIST) { | |
3165 | ERR("Tracer for application reported that an event being created already existed: " | |
3166 | "event_name = \"%s\", pid = %d, ppid = %d, uid = %d, gid = %d", | |
3167 | uevent->attr.name, | |
3168 | app->pid, app->ppid, app->uid, | |
3169 | app->gid); | |
3170 | } | |
284d8f55 DG |
3171 | goto error; |
3172 | } | |
3173 | ||
d0b96690 | 3174 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 3175 | |
fc34caaa | 3176 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 3177 | app->pid); |
7f79d3a1 | 3178 | |
edb67388 | 3179 | end: |
fc34caaa DG |
3180 | return ret; |
3181 | ||
5b4a0ec0 | 3182 | error: |
fc34caaa | 3183 | /* Valid. Calling here is already in a read side lock */ |
fb45065e | 3184 | delete_ust_app_event(-1, ua_event, app); |
edb67388 | 3185 | return ret; |
5b4a0ec0 DG |
3186 | } |
3187 | ||
3188 | /* | |
3189 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 3190 | * |
7972aab2 | 3191 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
3192 | */ |
3193 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
ad7a9107 | 3194 | struct ust_app *app, struct consumer_output *consumer) |
5b4a0ec0 DG |
3195 | { |
3196 | int ret = 0; | |
ffe60014 | 3197 | struct ust_app_channel *metadata; |
d88aee68 | 3198 | struct consumer_socket *socket; |
7972aab2 | 3199 | struct ust_registry_session *registry; |
e32d7f27 | 3200 | struct ltt_session *session = NULL; |
5b4a0ec0 | 3201 | |
ffe60014 DG |
3202 | assert(ua_sess); |
3203 | assert(app); | |
d88aee68 | 3204 | assert(consumer); |
5b4a0ec0 | 3205 | |
7972aab2 | 3206 | registry = get_session_registry(ua_sess); |
fad1ed2f | 3207 | /* The UST app session is held registry shall not be null. */ |
7972aab2 DG |
3208 | assert(registry); |
3209 | ||
ce34fcd0 MD |
3210 | pthread_mutex_lock(®istry->lock); |
3211 | ||
1b532a60 DG |
3212 | /* Metadata already exists for this registry or it was closed previously */ |
3213 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
3214 | ret = 0; |
3215 | goto error; | |
5b4a0ec0 DG |
3216 | } |
3217 | ||
ffe60014 | 3218 | /* Allocate UST metadata */ |
d0b96690 | 3219 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
3220 | if (!metadata) { |
3221 | /* malloc() failed */ | |
3222 | ret = -ENOMEM; | |
3223 | goto error; | |
3224 | } | |
5b4a0ec0 | 3225 | |
ad7a9107 | 3226 | memcpy(&metadata->attr, &ua_sess->metadata_attr, sizeof(metadata->attr)); |
5b4a0ec0 | 3227 | |
7972aab2 DG |
3228 | /* Need one fd for the channel. */ |
3229 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
3230 | if (ret < 0) { | |
3231 | ERR("Exhausted number of available FD upon create metadata"); | |
3232 | goto error; | |
3233 | } | |
3234 | ||
4dc3dfc5 DG |
3235 | /* Get the right consumer socket for the application. */ |
3236 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
3237 | if (!socket) { | |
3238 | ret = -EINVAL; | |
3239 | goto error_consumer; | |
3240 | } | |
3241 | ||
331744e3 JD |
3242 | /* |
3243 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
3244 | * to the registry *before* we ask the consumer so we avoid the race of the | |
3245 | * consumer requesting the metadata and the ask_channel call on our side | |
3246 | * did not returned yet. | |
3247 | */ | |
3248 | registry->metadata_key = metadata->key; | |
3249 | ||
e098433c JG |
3250 | session = session_find_by_id(ua_sess->tracing_id); |
3251 | assert(session); | |
3252 | ||
3253 | assert(pthread_mutex_trylock(&session->lock)); | |
3254 | assert(session_trylock_list()); | |
3255 | ||
d88aee68 DG |
3256 | /* |
3257 | * Ask the metadata channel creation to the consumer. The metadata object | |
3258 | * will be created by the consumer and kept their. However, the stream is | |
3259 | * never added or monitored until we do a first push metadata to the | |
3260 | * consumer. | |
3261 | */ | |
7972aab2 | 3262 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
d2956687 | 3263 | registry, session->current_trace_chunk); |
d88aee68 | 3264 | if (ret < 0) { |
f2a444f1 DG |
3265 | /* Nullify the metadata key so we don't try to close it later on. */ |
3266 | registry->metadata_key = 0; | |
d88aee68 DG |
3267 | goto error_consumer; |
3268 | } | |
3269 | ||
3270 | /* | |
3271 | * The setup command will make the metadata stream be sent to the relayd, | |
3272 | * if applicable, and the thread managing the metadatas. This is important | |
3273 | * because after this point, if an error occurs, the only way the stream | |
3274 | * can be deleted is to be monitored in the consumer. | |
3275 | */ | |
7972aab2 | 3276 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 3277 | if (ret < 0) { |
f2a444f1 DG |
3278 | /* Nullify the metadata key so we don't try to close it later on. */ |
3279 | registry->metadata_key = 0; | |
d88aee68 | 3280 | goto error_consumer; |
5b4a0ec0 DG |
3281 | } |
3282 | ||
7972aab2 DG |
3283 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
3284 | metadata->key, app->pid); | |
5b4a0ec0 | 3285 | |
d88aee68 | 3286 | error_consumer: |
b80f0b6c | 3287 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 3288 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 3289 | error: |
ce34fcd0 | 3290 | pthread_mutex_unlock(®istry->lock); |
e32d7f27 JG |
3291 | if (session) { |
3292 | session_put(session); | |
3293 | } | |
ffe60014 | 3294 | return ret; |
5b4a0ec0 DG |
3295 | } |
3296 | ||
5b4a0ec0 | 3297 | /* |
d88aee68 DG |
3298 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
3299 | * acquired before calling this function. | |
5b4a0ec0 DG |
3300 | */ |
3301 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
3302 | { | |
d88aee68 | 3303 | struct ust_app *app = NULL; |
bec39940 DG |
3304 | struct lttng_ht_node_ulong *node; |
3305 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 3306 | |
bec39940 DG |
3307 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
3308 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
3309 | if (node == NULL) { |
3310 | DBG2("UST app no found with pid %d", pid); | |
3311 | goto error; | |
3312 | } | |
5b4a0ec0 DG |
3313 | |
3314 | DBG2("Found UST app by pid %d", pid); | |
3315 | ||
d88aee68 | 3316 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
3317 | |
3318 | error: | |
d88aee68 | 3319 | return app; |
5b4a0ec0 DG |
3320 | } |
3321 | ||
d88aee68 DG |
3322 | /* |
3323 | * Allocate and init an UST app object using the registration information and | |
3324 | * the command socket. This is called when the command socket connects to the | |
3325 | * session daemon. | |
3326 | * | |
3327 | * The object is returned on success or else NULL. | |
3328 | */ | |
d0b96690 | 3329 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 3330 | { |
d0b96690 DG |
3331 | struct ust_app *lta = NULL; |
3332 | ||
3333 | assert(msg); | |
3334 | assert(sock >= 0); | |
3335 | ||
3336 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 3337 | |
173af62f DG |
3338 | if ((msg->bits_per_long == 64 && |
3339 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
3340 | || (msg->bits_per_long == 32 && | |
3341 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 3342 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
3343 | "%d-bit long, but no consumerd for this size is available.\n", |
3344 | msg->name, msg->pid, msg->bits_per_long); | |
3345 | goto error; | |
3f2c5fcc | 3346 | } |
d0b96690 | 3347 | |
5b4a0ec0 DG |
3348 | lta = zmalloc(sizeof(struct ust_app)); |
3349 | if (lta == NULL) { | |
3350 | PERROR("malloc"); | |
d0b96690 | 3351 | goto error; |
5b4a0ec0 DG |
3352 | } |
3353 | ||
3354 | lta->ppid = msg->ppid; | |
3355 | lta->uid = msg->uid; | |
3356 | lta->gid = msg->gid; | |
d0b96690 | 3357 | |
7753dea8 | 3358 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
3359 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
3360 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
3361 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
3362 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
3363 | lta->long_alignment = msg->long_alignment; | |
3364 | lta->byte_order = msg->byte_order; | |
3365 | ||
5b4a0ec0 DG |
3366 | lta->v_major = msg->major; |
3367 | lta->v_minor = msg->minor; | |
d9bf3ca4 | 3368 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 | 3369 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
10b56aef | 3370 | lta->ust_sessions_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3371 | lta->notify_sock = -1; |
d88aee68 DG |
3372 | |
3373 | /* Copy name and make sure it's NULL terminated. */ | |
3374 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
3375 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
3376 | ||
3377 | /* | |
3378 | * Before this can be called, when receiving the registration information, | |
3379 | * the application compatibility is checked. So, at this point, the | |
3380 | * application can work with this session daemon. | |
3381 | */ | |
d0b96690 | 3382 | lta->compatible = 1; |
5b4a0ec0 | 3383 | |
852d0037 | 3384 | lta->pid = msg->pid; |
d0b96690 | 3385 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 3386 | lta->sock = sock; |
fb45065e | 3387 | pthread_mutex_init(<a->sock_lock, NULL); |
d0b96690 | 3388 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 3389 | |
d42f20df | 3390 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
d0b96690 DG |
3391 | error: |
3392 | return lta; | |
3393 | } | |
3394 | ||
d88aee68 DG |
3395 | /* |
3396 | * For a given application object, add it to every hash table. | |
3397 | */ | |
d0b96690 DG |
3398 | void ust_app_add(struct ust_app *app) |
3399 | { | |
3400 | assert(app); | |
3401 | assert(app->notify_sock >= 0); | |
3402 | ||
940c4592 JR |
3403 | app->registration_time = time(NULL); |
3404 | ||
5b4a0ec0 | 3405 | rcu_read_lock(); |
852d0037 DG |
3406 | |
3407 | /* | |
3408 | * On a re-registration, we want to kick out the previous registration of | |
3409 | * that pid | |
3410 | */ | |
d0b96690 | 3411 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
3412 | |
3413 | /* | |
3414 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
3415 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
3416 | * already in the table. | |
3417 | */ | |
d0b96690 | 3418 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 3419 | |
d0b96690 DG |
3420 | /* Add application to the notify socket hash table. */ |
3421 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
3422 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 3423 | |
d0b96690 | 3424 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
3425 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
3426 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
3427 | app->v_minor); | |
5b4a0ec0 | 3428 | |
d0b96690 DG |
3429 | rcu_read_unlock(); |
3430 | } | |
3431 | ||
d88aee68 DG |
3432 | /* |
3433 | * Set the application version into the object. | |
3434 | * | |
3435 | * Return 0 on success else a negative value either an errno code or a | |
3436 | * LTTng-UST error code. | |
3437 | */ | |
d0b96690 DG |
3438 | int ust_app_version(struct ust_app *app) |
3439 | { | |
d88aee68 DG |
3440 | int ret; |
3441 | ||
d0b96690 | 3442 | assert(app); |
d88aee68 | 3443 | |
fb45065e | 3444 | pthread_mutex_lock(&app->sock_lock); |
d88aee68 | 3445 | ret = ustctl_tracer_version(app->sock, &app->version); |
fb45065e | 3446 | pthread_mutex_unlock(&app->sock_lock); |
d88aee68 DG |
3447 | if (ret < 0) { |
3448 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
5368d366 | 3449 | ERR("UST app %d version failed with ret %d", app->sock, ret); |
d88aee68 | 3450 | } else { |
5368d366 | 3451 | DBG3("UST app %d version failed. Application is dead", app->sock); |
d88aee68 DG |
3452 | } |
3453 | } | |
3454 | ||
3455 | return ret; | |
5b4a0ec0 DG |
3456 | } |
3457 | ||
3458 | /* | |
3459 | * Unregister app by removing it from the global traceable app list and freeing | |
3460 | * the data struct. | |
3461 | * | |
3462 | * The socket is already closed at this point so no close to sock. | |
3463 | */ | |
3464 | void ust_app_unregister(int sock) | |
3465 | { | |
3466 | struct ust_app *lta; | |
bec39940 | 3467 | struct lttng_ht_node_ulong *node; |
c4b88406 | 3468 | struct lttng_ht_iter ust_app_sock_iter; |
bec39940 | 3469 | struct lttng_ht_iter iter; |
d42f20df | 3470 | struct ust_app_session *ua_sess; |
525b0740 | 3471 | int ret; |
5b4a0ec0 DG |
3472 | |
3473 | rcu_read_lock(); | |
886459c6 | 3474 | |
5b4a0ec0 | 3475 | /* Get the node reference for a call_rcu */ |
c4b88406 MD |
3476 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &ust_app_sock_iter); |
3477 | node = lttng_ht_iter_get_node_ulong(&ust_app_sock_iter); | |
d0b96690 | 3478 | assert(node); |
284d8f55 | 3479 | |
852d0037 | 3480 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
3481 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
3482 | ||
d88aee68 | 3483 | /* |
ce34fcd0 MD |
3484 | * For per-PID buffers, perform "push metadata" and flush all |
3485 | * application streams before removing app from hash tables, | |
3486 | * ensuring proper behavior of data_pending check. | |
c4b88406 | 3487 | * Remove sessions so they are not visible during deletion. |
d88aee68 | 3488 | */ |
d42f20df DG |
3489 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, |
3490 | node.node) { | |
7972aab2 DG |
3491 | struct ust_registry_session *registry; |
3492 | ||
d42f20df DG |
3493 | ret = lttng_ht_del(lta->sessions, &iter); |
3494 | if (ret) { | |
3495 | /* The session was already removed so scheduled for teardown. */ | |
3496 | continue; | |
3497 | } | |
3498 | ||
ce34fcd0 MD |
3499 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { |
3500 | (void) ust_app_flush_app_session(lta, ua_sess); | |
3501 | } | |
c4b88406 | 3502 | |
d42f20df DG |
3503 | /* |
3504 | * Add session to list for teardown. This is safe since at this point we | |
3505 | * are the only one using this list. | |
3506 | */ | |
d88aee68 DG |
3507 | pthread_mutex_lock(&ua_sess->lock); |
3508 | ||
b161602a MD |
3509 | if (ua_sess->deleted) { |
3510 | pthread_mutex_unlock(&ua_sess->lock); | |
3511 | continue; | |
3512 | } | |
3513 | ||
d88aee68 DG |
3514 | /* |
3515 | * Normally, this is done in the delete session process which is | |
3516 | * executed in the call rcu below. However, upon registration we can't | |
3517 | * afford to wait for the grace period before pushing data or else the | |
3518 | * data pending feature can race between the unregistration and stop | |
3519 | * command where the data pending command is sent *before* the grace | |
3520 | * period ended. | |
3521 | * | |
3522 | * The close metadata below nullifies the metadata pointer in the | |
3523 | * session so the delete session will NOT push/close a second time. | |
3524 | */ | |
7972aab2 | 3525 | registry = get_session_registry(ua_sess); |
ce34fcd0 | 3526 | if (registry) { |
7972aab2 DG |
3527 | /* Push metadata for application before freeing the application. */ |
3528 | (void) push_metadata(registry, ua_sess->consumer); | |
3529 | ||
3530 | /* | |
3531 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
3532 | * metadata only on destroy trace session in this case. Also, the |
3533 | * previous push metadata could have flag the metadata registry to | |
3534 | * close so don't send a close command if closed. | |
7972aab2 | 3535 | */ |
ce34fcd0 | 3536 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
3537 | /* And ask to close it for this session registry. */ |
3538 | (void) close_metadata(registry, ua_sess->consumer); | |
3539 | } | |
3540 | } | |
d42f20df | 3541 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
c4b88406 | 3542 | |
d88aee68 | 3543 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
3544 | } |
3545 | ||
c4b88406 MD |
3546 | /* Remove application from PID hash table */ |
3547 | ret = lttng_ht_del(ust_app_ht_by_sock, &ust_app_sock_iter); | |
3548 | assert(!ret); | |
3549 | ||
3550 | /* | |
3551 | * Remove application from notify hash table. The thread handling the | |
3552 | * notify socket could have deleted the node so ignore on error because | |
c48239ca JG |
3553 | * either way it's valid. The close of that socket is handled by the |
3554 | * apps_notify_thread. | |
c4b88406 MD |
3555 | */ |
3556 | iter.iter.node = <a->notify_sock_n.node; | |
3557 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3558 | ||
3559 | /* | |
3560 | * Ignore return value since the node might have been removed before by an | |
3561 | * add replace during app registration because the PID can be reassigned by | |
3562 | * the OS. | |
3563 | */ | |
3564 | iter.iter.node = <a->pid_n.node; | |
3565 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3566 | if (ret) { | |
3567 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
3568 | lta->pid); | |
3569 | } | |
3570 | ||
852d0037 DG |
3571 | /* Free memory */ |
3572 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
3573 | ||
5b4a0ec0 DG |
3574 | rcu_read_unlock(); |
3575 | return; | |
284d8f55 DG |
3576 | } |
3577 | ||
5b4a0ec0 DG |
3578 | /* |
3579 | * Fill events array with all events name of all registered apps. | |
3580 | */ | |
3581 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 3582 | { |
5b4a0ec0 DG |
3583 | int ret, handle; |
3584 | size_t nbmem, count = 0; | |
bec39940 | 3585 | struct lttng_ht_iter iter; |
5b4a0ec0 | 3586 | struct ust_app *app; |
c617c0c6 | 3587 | struct lttng_event *tmp_event; |
421cb601 | 3588 | |
5b4a0ec0 | 3589 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
3590 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
3591 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
3592 | PERROR("zmalloc ust app events"); |
3593 | ret = -ENOMEM; | |
421cb601 DG |
3594 | goto error; |
3595 | } | |
3596 | ||
5b4a0ec0 | 3597 | rcu_read_lock(); |
421cb601 | 3598 | |
852d0037 | 3599 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 3600 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 3601 | |
840cb59c | 3602 | health_code_update(); |
86acf0da | 3603 | |
e0c7ec2b DG |
3604 | if (!app->compatible) { |
3605 | /* | |
3606 | * TODO: In time, we should notice the caller of this error by | |
3607 | * telling him that this is a version error. | |
3608 | */ | |
3609 | continue; | |
3610 | } | |
fb45065e | 3611 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 3612 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 3613 | if (handle < 0) { |
ffe60014 DG |
3614 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3615 | ERR("UST app list events getting handle failed for app pid %d", | |
3616 | app->pid); | |
3617 | } | |
fb45065e | 3618 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 DG |
3619 | continue; |
3620 | } | |
421cb601 | 3621 | |
852d0037 | 3622 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 3623 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3624 | /* Handle ustctl error. */ |
3625 | if (ret < 0) { | |
fb45065e MD |
3626 | int release_ret; |
3627 | ||
a2ba1ab0 | 3628 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3629 | ERR("UST app tp list get failed for app %d with ret %d", |
3630 | app->sock, ret); | |
3631 | } else { | |
3632 | DBG3("UST app tp list get failed. Application is dead"); | |
3757b385 DG |
3633 | /* |
3634 | * This is normal behavior, an application can die during the | |
3635 | * creation process. Don't report an error so the execution can | |
3636 | * continue normally. Continue normal execution. | |
3637 | */ | |
3638 | break; | |
ffe60014 | 3639 | } |
98f595d4 | 3640 | free(tmp_event); |
fb45065e | 3641 | release_ret = ustctl_release_handle(app->sock, handle); |
68313703 JG |
3642 | if (release_ret < 0 && |
3643 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3644 | release_ret != -EPIPE) { | |
fb45065e MD |
3645 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3646 | } | |
3647 | pthread_mutex_unlock(&app->sock_lock); | |
ffe60014 DG |
3648 | goto rcu_error; |
3649 | } | |
3650 | ||
840cb59c | 3651 | health_code_update(); |
815564d8 | 3652 | if (count >= nbmem) { |
d7b3776f | 3653 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3654 | struct lttng_event *new_tmp_event; |
3655 | size_t new_nbmem; | |
3656 | ||
3657 | new_nbmem = nbmem << 1; | |
3658 | DBG2("Reallocating event list from %zu to %zu entries", | |
3659 | nbmem, new_nbmem); | |
3660 | new_tmp_event = realloc(tmp_event, | |
3661 | new_nbmem * sizeof(struct lttng_event)); | |
3662 | if (new_tmp_event == NULL) { | |
fb45065e MD |
3663 | int release_ret; |
3664 | ||
5b4a0ec0 | 3665 | PERROR("realloc ust app events"); |
c617c0c6 | 3666 | free(tmp_event); |
5b4a0ec0 | 3667 | ret = -ENOMEM; |
fb45065e | 3668 | release_ret = ustctl_release_handle(app->sock, handle); |
68313703 JG |
3669 | if (release_ret < 0 && |
3670 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3671 | release_ret != -EPIPE) { | |
fb45065e MD |
3672 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3673 | } | |
3674 | pthread_mutex_unlock(&app->sock_lock); | |
5b4a0ec0 DG |
3675 | goto rcu_error; |
3676 | } | |
53efb85a MD |
3677 | /* Zero the new memory */ |
3678 | memset(new_tmp_event + nbmem, 0, | |
3679 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
3680 | nbmem = new_nbmem; | |
3681 | tmp_event = new_tmp_event; | |
5b4a0ec0 | 3682 | } |
c617c0c6 MD |
3683 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
3684 | tmp_event[count].loglevel = uiter.loglevel; | |
3685 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
3686 | tmp_event[count].pid = app->pid; | |
3687 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 3688 | count++; |
421cb601 | 3689 | } |
fb45065e MD |
3690 | ret = ustctl_release_handle(app->sock, handle); |
3691 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 | 3692 | if (ret < 0 && ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
fb45065e MD |
3693 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
3694 | } | |
421cb601 DG |
3695 | } |
3696 | ||
5b4a0ec0 | 3697 | ret = count; |
c617c0c6 | 3698 | *events = tmp_event; |
421cb601 | 3699 | |
5b4a0ec0 | 3700 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 3701 | |
5b4a0ec0 DG |
3702 | rcu_error: |
3703 | rcu_read_unlock(); | |
421cb601 | 3704 | error: |
840cb59c | 3705 | health_code_update(); |
5b4a0ec0 | 3706 | return ret; |
421cb601 DG |
3707 | } |
3708 | ||
f37d259d MD |
3709 | /* |
3710 | * Fill events array with all events name of all registered apps. | |
3711 | */ | |
3712 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
3713 | { | |
3714 | int ret, handle; | |
3715 | size_t nbmem, count = 0; | |
3716 | struct lttng_ht_iter iter; | |
3717 | struct ust_app *app; | |
c617c0c6 | 3718 | struct lttng_event_field *tmp_event; |
f37d259d MD |
3719 | |
3720 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
3721 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
3722 | if (tmp_event == NULL) { | |
f37d259d MD |
3723 | PERROR("zmalloc ust app event fields"); |
3724 | ret = -ENOMEM; | |
3725 | goto error; | |
3726 | } | |
3727 | ||
3728 | rcu_read_lock(); | |
3729 | ||
3730 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3731 | struct lttng_ust_field_iter uiter; | |
3732 | ||
840cb59c | 3733 | health_code_update(); |
86acf0da | 3734 | |
f37d259d MD |
3735 | if (!app->compatible) { |
3736 | /* | |
3737 | * TODO: In time, we should notice the caller of this error by | |
3738 | * telling him that this is a version error. | |
3739 | */ | |
3740 | continue; | |
3741 | } | |
fb45065e | 3742 | pthread_mutex_lock(&app->sock_lock); |
f37d259d MD |
3743 | handle = ustctl_tracepoint_field_list(app->sock); |
3744 | if (handle < 0) { | |
ffe60014 DG |
3745 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3746 | ERR("UST app list field getting handle failed for app pid %d", | |
3747 | app->pid); | |
3748 | } | |
fb45065e | 3749 | pthread_mutex_unlock(&app->sock_lock); |
f37d259d MD |
3750 | continue; |
3751 | } | |
3752 | ||
3753 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 3754 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3755 | /* Handle ustctl error. */ |
3756 | if (ret < 0) { | |
fb45065e MD |
3757 | int release_ret; |
3758 | ||
a2ba1ab0 | 3759 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3760 | ERR("UST app tp list field failed for app %d with ret %d", |
3761 | app->sock, ret); | |
3762 | } else { | |
3763 | DBG3("UST app tp list field failed. Application is dead"); | |
3757b385 DG |
3764 | /* |
3765 | * This is normal behavior, an application can die during the | |
3766 | * creation process. Don't report an error so the execution can | |
98f595d4 | 3767 | * continue normally. Reset list and count for next app. |
3757b385 DG |
3768 | */ |
3769 | break; | |
ffe60014 | 3770 | } |
98f595d4 | 3771 | free(tmp_event); |
fb45065e MD |
3772 | release_ret = ustctl_release_handle(app->sock, handle); |
3773 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
3774 | if (release_ret < 0 && |
3775 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3776 | release_ret != -EPIPE) { | |
fb45065e MD |
3777 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3778 | } | |
ffe60014 DG |
3779 | goto rcu_error; |
3780 | } | |
3781 | ||
840cb59c | 3782 | health_code_update(); |
f37d259d | 3783 | if (count >= nbmem) { |
d7b3776f | 3784 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3785 | struct lttng_event_field *new_tmp_event; |
3786 | size_t new_nbmem; | |
3787 | ||
3788 | new_nbmem = nbmem << 1; | |
3789 | DBG2("Reallocating event field list from %zu to %zu entries", | |
3790 | nbmem, new_nbmem); | |
3791 | new_tmp_event = realloc(tmp_event, | |
3792 | new_nbmem * sizeof(struct lttng_event_field)); | |
3793 | if (new_tmp_event == NULL) { | |
fb45065e MD |
3794 | int release_ret; |
3795 | ||
f37d259d | 3796 | PERROR("realloc ust app event fields"); |
c617c0c6 | 3797 | free(tmp_event); |
f37d259d | 3798 | ret = -ENOMEM; |
fb45065e MD |
3799 | release_ret = ustctl_release_handle(app->sock, handle); |
3800 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
3801 | if (release_ret && |
3802 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3803 | release_ret != -EPIPE) { | |
fb45065e MD |
3804 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3805 | } | |
f37d259d MD |
3806 | goto rcu_error; |
3807 | } | |
53efb85a MD |
3808 | /* Zero the new memory */ |
3809 | memset(new_tmp_event + nbmem, 0, | |
3810 | (new_nbmem - nbmem) * sizeof(struct lttng_event_field)); | |
3811 | nbmem = new_nbmem; | |
3812 | tmp_event = new_tmp_event; | |
f37d259d | 3813 | } |
f37d259d | 3814 | |
c617c0c6 | 3815 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
2e84128e DG |
3816 | /* Mapping between these enums matches 1 to 1. */ |
3817 | tmp_event[count].type = (enum lttng_event_field_type) uiter.type; | |
c617c0c6 | 3818 | tmp_event[count].nowrite = uiter.nowrite; |
f37d259d | 3819 | |
c617c0c6 MD |
3820 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
3821 | tmp_event[count].event.loglevel = uiter.loglevel; | |
2e84128e | 3822 | tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; |
c617c0c6 MD |
3823 | tmp_event[count].event.pid = app->pid; |
3824 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
3825 | count++; |
3826 | } | |
fb45065e MD |
3827 | ret = ustctl_release_handle(app->sock, handle); |
3828 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
3829 | if (ret < 0 && |
3830 | ret != -LTTNG_UST_ERR_EXITING && | |
3831 | ret != -EPIPE) { | |
fb45065e MD |
3832 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
3833 | } | |
f37d259d MD |
3834 | } |
3835 | ||
3836 | ret = count; | |
c617c0c6 | 3837 | *fields = tmp_event; |
f37d259d MD |
3838 | |
3839 | DBG2("UST app list event fields done (%zu events)", count); | |
3840 | ||
3841 | rcu_error: | |
3842 | rcu_read_unlock(); | |
3843 | error: | |
840cb59c | 3844 | health_code_update(); |
f37d259d MD |
3845 | return ret; |
3846 | } | |
3847 | ||
5b4a0ec0 DG |
3848 | /* |
3849 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
3850 | * |
3851 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
3852 | */ |
3853 | void ust_app_clean_list(void) | |
421cb601 | 3854 | { |
5b4a0ec0 | 3855 | int ret; |
659ed79f | 3856 | struct ust_app *app; |
bec39940 | 3857 | struct lttng_ht_iter iter; |
421cb601 | 3858 | |
5b4a0ec0 | 3859 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3860 | |
5b4a0ec0 | 3861 | rcu_read_lock(); |
421cb601 | 3862 | |
faadaa3a JG |
3863 | /* Cleanup notify socket hash table */ |
3864 | if (ust_app_ht_by_notify_sock) { | |
3865 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3866 | notify_sock_n.node) { | |
3867 | struct cds_lfht_node *node; | |
3868 | struct ust_app *app; | |
3869 | ||
3870 | node = cds_lfht_iter_get_node(&iter.iter); | |
3871 | if (!node) { | |
3872 | continue; | |
3873 | } | |
3874 | ||
3875 | app = container_of(node, struct ust_app, | |
3876 | notify_sock_n.node); | |
3877 | ust_app_notify_sock_unregister(app->notify_sock); | |
3878 | } | |
3879 | } | |
3880 | ||
f1b711c4 MD |
3881 | if (ust_app_ht) { |
3882 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3883 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3884 | assert(!ret); | |
3885 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
3886 | } | |
421cb601 DG |
3887 | } |
3888 | ||
852d0037 | 3889 | /* Cleanup socket hash table */ |
f1b711c4 MD |
3890 | if (ust_app_ht_by_sock) { |
3891 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, | |
3892 | sock_n.node) { | |
3893 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); | |
3894 | assert(!ret); | |
3895 | } | |
bec39940 | 3896 | } |
852d0037 | 3897 | |
36b588ed | 3898 | rcu_read_unlock(); |
d88aee68 | 3899 | |
bec39940 | 3900 | /* Destroy is done only when the ht is empty */ |
f1b711c4 MD |
3901 | if (ust_app_ht) { |
3902 | ht_cleanup_push(ust_app_ht); | |
3903 | } | |
3904 | if (ust_app_ht_by_sock) { | |
3905 | ht_cleanup_push(ust_app_ht_by_sock); | |
3906 | } | |
3907 | if (ust_app_ht_by_notify_sock) { | |
3908 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
3909 | } | |
5b4a0ec0 DG |
3910 | } |
3911 | ||
3912 | /* | |
3913 | * Init UST app hash table. | |
3914 | */ | |
57703f6e | 3915 | int ust_app_ht_alloc(void) |
5b4a0ec0 | 3916 | { |
bec39940 | 3917 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3918 | if (!ust_app_ht) { |
3919 | return -1; | |
3920 | } | |
852d0037 | 3921 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3922 | if (!ust_app_ht_by_sock) { |
3923 | return -1; | |
3924 | } | |
d0b96690 | 3925 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3926 | if (!ust_app_ht_by_notify_sock) { |
3927 | return -1; | |
3928 | } | |
3929 | return 0; | |
421cb601 DG |
3930 | } |
3931 | ||
78f0bacd DG |
3932 | /* |
3933 | * For a specific UST session, disable the channel for all registered apps. | |
3934 | */ | |
35a9059d | 3935 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3936 | struct ltt_ust_channel *uchan) |
3937 | { | |
3938 | int ret = 0; | |
bec39940 DG |
3939 | struct lttng_ht_iter iter; |
3940 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3941 | struct ust_app *app; |
3942 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3943 | struct ust_app_channel *ua_chan; |
78f0bacd | 3944 | |
88e3c2f5 | 3945 | assert(usess->active); |
d9bf3ca4 | 3946 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 3947 | uchan->name, usess->id); |
78f0bacd DG |
3948 | |
3949 | rcu_read_lock(); | |
3950 | ||
3951 | /* For every registered applications */ | |
852d0037 | 3952 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3953 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3954 | if (!app->compatible) { |
3955 | /* | |
3956 | * TODO: In time, we should notice the caller of this error by | |
3957 | * telling him that this is a version error. | |
3958 | */ | |
3959 | continue; | |
3960 | } | |
78f0bacd DG |
3961 | ua_sess = lookup_session_by_app(usess, app); |
3962 | if (ua_sess == NULL) { | |
3963 | continue; | |
3964 | } | |
3965 | ||
8535a6d9 | 3966 | /* Get channel */ |
bec39940 DG |
3967 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3968 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
3969 | /* If the session if found for the app, the channel must be there */ |
3970 | assert(ua_chan_node); | |
3971 | ||
3972 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3973 | /* The channel must not be already disabled */ | |
3974 | assert(ua_chan->enabled == 1); | |
3975 | ||
3976 | /* Disable channel onto application */ | |
3977 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
3978 | if (ret < 0) { |
3979 | /* XXX: We might want to report this error at some point... */ | |
3980 | continue; | |
3981 | } | |
3982 | } | |
3983 | ||
3984 | rcu_read_unlock(); | |
78f0bacd DG |
3985 | return ret; |
3986 | } | |
3987 | ||
3988 | /* | |
3989 | * For a specific UST session, enable the channel for all registered apps. | |
3990 | */ | |
35a9059d | 3991 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3992 | struct ltt_ust_channel *uchan) |
3993 | { | |
3994 | int ret = 0; | |
bec39940 | 3995 | struct lttng_ht_iter iter; |
78f0bacd DG |
3996 | struct ust_app *app; |
3997 | struct ust_app_session *ua_sess; | |
3998 | ||
88e3c2f5 | 3999 | assert(usess->active); |
d9bf3ca4 | 4000 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 4001 | uchan->name, usess->id); |
78f0bacd DG |
4002 | |
4003 | rcu_read_lock(); | |
4004 | ||
4005 | /* For every registered applications */ | |
852d0037 | 4006 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4007 | if (!app->compatible) { |
4008 | /* | |
4009 | * TODO: In time, we should notice the caller of this error by | |
4010 | * telling him that this is a version error. | |
4011 | */ | |
4012 | continue; | |
4013 | } | |
78f0bacd DG |
4014 | ua_sess = lookup_session_by_app(usess, app); |
4015 | if (ua_sess == NULL) { | |
4016 | continue; | |
4017 | } | |
4018 | ||
4019 | /* Enable channel onto application */ | |
4020 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
4021 | if (ret < 0) { | |
4022 | /* XXX: We might want to report this error at some point... */ | |
4023 | continue; | |
4024 | } | |
4025 | } | |
4026 | ||
4027 | rcu_read_unlock(); | |
78f0bacd DG |
4028 | return ret; |
4029 | } | |
4030 | ||
b0a40d28 DG |
4031 | /* |
4032 | * Disable an event in a channel and for a specific session. | |
4033 | */ | |
35a9059d DG |
4034 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
4035 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
4036 | { |
4037 | int ret = 0; | |
bec39940 | 4038 | struct lttng_ht_iter iter, uiter; |
700c5a9d | 4039 | struct lttng_ht_node_str *ua_chan_node; |
b0a40d28 DG |
4040 | struct ust_app *app; |
4041 | struct ust_app_session *ua_sess; | |
4042 | struct ust_app_channel *ua_chan; | |
4043 | struct ust_app_event *ua_event; | |
4044 | ||
88e3c2f5 | 4045 | assert(usess->active); |
b0a40d28 | 4046 | DBG("UST app disabling event %s for all apps in channel " |
d9bf3ca4 MD |
4047 | "%s for session id %" PRIu64, |
4048 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
4049 | |
4050 | rcu_read_lock(); | |
4051 | ||
4052 | /* For all registered applications */ | |
852d0037 | 4053 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4054 | if (!app->compatible) { |
4055 | /* | |
4056 | * TODO: In time, we should notice the caller of this error by | |
4057 | * telling him that this is a version error. | |
4058 | */ | |
4059 | continue; | |
4060 | } | |
b0a40d28 DG |
4061 | ua_sess = lookup_session_by_app(usess, app); |
4062 | if (ua_sess == NULL) { | |
4063 | /* Next app */ | |
4064 | continue; | |
4065 | } | |
4066 | ||
4067 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
4068 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4069 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 4070 | if (ua_chan_node == NULL) { |
d9bf3ca4 | 4071 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 4072 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
4073 | continue; |
4074 | } | |
4075 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4076 | ||
700c5a9d JR |
4077 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
4078 | uevent->filter, uevent->attr.loglevel, | |
4079 | uevent->exclusion); | |
4080 | if (ua_event == NULL) { | |
b0a40d28 | 4081 | DBG2("Event %s not found in channel %s for app pid %d." |
852d0037 | 4082 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
4083 | continue; |
4084 | } | |
b0a40d28 | 4085 | |
7f79d3a1 | 4086 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
4087 | if (ret < 0) { |
4088 | /* XXX: Report error someday... */ | |
4089 | continue; | |
4090 | } | |
4091 | } | |
4092 | ||
4093 | rcu_read_unlock(); | |
88e3c2f5 JG |
4094 | return ret; |
4095 | } | |
4096 | ||
4097 | /* The ua_sess lock must be held by the caller. */ | |
4098 | static | |
4099 | int ust_app_channel_create(struct ltt_ust_session *usess, | |
4100 | struct ust_app_session *ua_sess, | |
4101 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
4102 | struct ust_app_channel **_ua_chan) | |
4103 | { | |
4104 | int ret = 0; | |
4105 | struct ust_app_channel *ua_chan = NULL; | |
4106 | ||
4107 | assert(ua_sess); | |
4108 | ASSERT_LOCKED(ua_sess->lock); | |
4109 | ||
4110 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, | |
4111 | sizeof(uchan->name))) { | |
4112 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, | |
4113 | &uchan->attr); | |
4114 | ret = 0; | |
4115 | } else { | |
4116 | struct ltt_ust_context *uctx = NULL; | |
4117 | ||
4118 | /* | |
4119 | * Create channel onto application and synchronize its | |
4120 | * configuration. | |
4121 | */ | |
4122 | ret = ust_app_channel_allocate(ua_sess, uchan, | |
4123 | LTTNG_UST_CHAN_PER_CPU, usess, | |
4124 | &ua_chan); | |
4125 | if (ret == 0) { | |
4126 | ret = ust_app_channel_send(app, usess, | |
4127 | ua_sess, ua_chan); | |
4128 | } else { | |
4129 | goto end; | |
4130 | } | |
4131 | ||
4132 | /* Add contexts. */ | |
4133 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { | |
4134 | ret = create_ust_app_channel_context(ua_chan, | |
4135 | &uctx->ctx, app); | |
4136 | if (ret) { | |
4137 | goto end; | |
4138 | } | |
4139 | } | |
4140 | } | |
4141 | if (ret < 0) { | |
4142 | switch (ret) { | |
4143 | case -ENOTCONN: | |
4144 | /* | |
4145 | * The application's socket is not valid. Either a bad socket | |
4146 | * or a timeout on it. We can't inform the caller that for a | |
4147 | * specific app, the session failed so lets continue here. | |
4148 | */ | |
4149 | ret = 0; /* Not an error. */ | |
4150 | break; | |
4151 | case -ENOMEM: | |
4152 | default: | |
4153 | break; | |
4154 | } | |
4155 | } | |
0498a00c | 4156 | end: |
88e3c2f5 JG |
4157 | if (ret == 0 && _ua_chan) { |
4158 | /* | |
4159 | * Only return the application's channel on success. Note | |
4160 | * that the channel can still be part of the application's | |
4161 | * channel hashtable on error. | |
4162 | */ | |
4163 | *_ua_chan = ua_chan; | |
4164 | } | |
b0a40d28 DG |
4165 | return ret; |
4166 | } | |
4167 | ||
5b4a0ec0 | 4168 | /* |
edb67388 | 4169 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 4170 | */ |
35a9059d | 4171 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
4172 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4173 | { | |
4174 | int ret = 0; | |
bec39940 | 4175 | struct lttng_ht_iter iter, uiter; |
18eace3b | 4176 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
4177 | struct ust_app *app; |
4178 | struct ust_app_session *ua_sess; | |
4179 | struct ust_app_channel *ua_chan; | |
4180 | struct ust_app_event *ua_event; | |
48842b30 | 4181 | |
88e3c2f5 | 4182 | assert(usess->active); |
d9bf3ca4 | 4183 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 4184 | uevent->attr.name, usess->id); |
48842b30 | 4185 | |
edb67388 DG |
4186 | /* |
4187 | * NOTE: At this point, this function is called only if the session and | |
4188 | * channel passed are already created for all apps. and enabled on the | |
4189 | * tracer also. | |
4190 | */ | |
4191 | ||
48842b30 | 4192 | rcu_read_lock(); |
421cb601 DG |
4193 | |
4194 | /* For all registered applications */ | |
852d0037 | 4195 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4196 | if (!app->compatible) { |
4197 | /* | |
4198 | * TODO: In time, we should notice the caller of this error by | |
4199 | * telling him that this is a version error. | |
4200 | */ | |
4201 | continue; | |
4202 | } | |
edb67388 | 4203 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4204 | if (!ua_sess) { |
4205 | /* The application has problem or is probably dead. */ | |
4206 | continue; | |
4207 | } | |
ba767faf | 4208 | |
d0b96690 DG |
4209 | pthread_mutex_lock(&ua_sess->lock); |
4210 | ||
b161602a MD |
4211 | if (ua_sess->deleted) { |
4212 | pthread_mutex_unlock(&ua_sess->lock); | |
4213 | continue; | |
4214 | } | |
4215 | ||
edb67388 | 4216 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4217 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4218 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
a7169585 MD |
4219 | /* |
4220 | * It is possible that the channel cannot be found is | |
4221 | * the channel/event creation occurs concurrently with | |
4222 | * an application exit. | |
4223 | */ | |
4224 | if (!ua_chan_node) { | |
4225 | pthread_mutex_unlock(&ua_sess->lock); | |
4226 | continue; | |
4227 | } | |
edb67388 DG |
4228 | |
4229 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4230 | ||
18eace3b DG |
4231 | /* Get event node */ |
4232 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
39c5a3a7 | 4233 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 4234 | if (ua_event == NULL) { |
7f79d3a1 | 4235 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 4236 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 4237 | goto next_app; |
35a9059d | 4238 | } |
35a9059d DG |
4239 | |
4240 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
4241 | if (ret < 0) { | |
d0b96690 | 4242 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 4243 | goto error; |
48842b30 | 4244 | } |
d0b96690 DG |
4245 | next_app: |
4246 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
4247 | } |
4248 | ||
7f79d3a1 | 4249 | error: |
edb67388 | 4250 | rcu_read_unlock(); |
edb67388 DG |
4251 | return ret; |
4252 | } | |
4253 | ||
4254 | /* | |
4255 | * For a specific existing UST session and UST channel, creates the event for | |
4256 | * all registered apps. | |
4257 | */ | |
35a9059d | 4258 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
4259 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4260 | { | |
4261 | int ret = 0; | |
bec39940 DG |
4262 | struct lttng_ht_iter iter, uiter; |
4263 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
4264 | struct ust_app *app; |
4265 | struct ust_app_session *ua_sess; | |
4266 | struct ust_app_channel *ua_chan; | |
4267 | ||
88e3c2f5 | 4268 | assert(usess->active); |
d9bf3ca4 | 4269 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 4270 | uevent->attr.name, usess->id); |
edb67388 | 4271 | |
edb67388 DG |
4272 | rcu_read_lock(); |
4273 | ||
4274 | /* For all registered applications */ | |
852d0037 | 4275 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4276 | if (!app->compatible) { |
4277 | /* | |
4278 | * TODO: In time, we should notice the caller of this error by | |
4279 | * telling him that this is a version error. | |
4280 | */ | |
4281 | continue; | |
4282 | } | |
edb67388 | 4283 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4284 | if (!ua_sess) { |
4285 | /* The application has problem or is probably dead. */ | |
4286 | continue; | |
4287 | } | |
48842b30 | 4288 | |
d0b96690 | 4289 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
4290 | |
4291 | if (ua_sess->deleted) { | |
4292 | pthread_mutex_unlock(&ua_sess->lock); | |
4293 | continue; | |
4294 | } | |
4295 | ||
48842b30 | 4296 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4297 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4298 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
4299 | /* If the channel is not found, there is a code flow error */ |
4300 | assert(ua_chan_node); | |
4301 | ||
48842b30 DG |
4302 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
4303 | ||
edb67388 | 4304 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 4305 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 4306 | if (ret < 0) { |
49c336c1 | 4307 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
4308 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
4309 | break; | |
4310 | } | |
4311 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 4312 | uevent->attr.name, app->pid); |
5b4a0ec0 | 4313 | continue; |
48842b30 | 4314 | } |
48842b30 | 4315 | } |
5b4a0ec0 | 4316 | |
48842b30 | 4317 | rcu_read_unlock(); |
48842b30 DG |
4318 | return ret; |
4319 | } | |
4320 | ||
5b4a0ec0 DG |
4321 | /* |
4322 | * Start tracing for a specific UST session and app. | |
fad1ed2f JR |
4323 | * |
4324 | * Called with UST app session lock held. | |
4325 | * | |
5b4a0ec0 | 4326 | */ |
b34cbebf | 4327 | static |
421cb601 | 4328 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
4329 | { |
4330 | int ret = 0; | |
48842b30 | 4331 | struct ust_app_session *ua_sess; |
48842b30 | 4332 | |
852d0037 | 4333 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 4334 | |
509cbaf8 MD |
4335 | rcu_read_lock(); |
4336 | ||
e0c7ec2b DG |
4337 | if (!app->compatible) { |
4338 | goto end; | |
4339 | } | |
4340 | ||
421cb601 DG |
4341 | ua_sess = lookup_session_by_app(usess, app); |
4342 | if (ua_sess == NULL) { | |
d42f20df DG |
4343 | /* The session is in teardown process. Ignore and continue. */ |
4344 | goto end; | |
421cb601 | 4345 | } |
48842b30 | 4346 | |
d0b96690 DG |
4347 | pthread_mutex_lock(&ua_sess->lock); |
4348 | ||
b161602a MD |
4349 | if (ua_sess->deleted) { |
4350 | pthread_mutex_unlock(&ua_sess->lock); | |
4351 | goto end; | |
4352 | } | |
4353 | ||
b0a1c741 JR |
4354 | if (ua_sess->enabled) { |
4355 | pthread_mutex_unlock(&ua_sess->lock); | |
4356 | goto end; | |
4357 | } | |
4358 | ||
aea829b3 DG |
4359 | /* Upon restart, we skip the setup, already done */ |
4360 | if (ua_sess->started) { | |
8be98f9a | 4361 | goto skip_setup; |
aea829b3 | 4362 | } |
8be98f9a | 4363 | |
d65d2de8 DG |
4364 | /* |
4365 | * Create the metadata for the application. This returns gracefully if a | |
4366 | * metadata was already set for the session. | |
4367 | */ | |
ad7a9107 | 4368 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer); |
421cb601 | 4369 | if (ret < 0) { |
d0b96690 | 4370 | goto error_unlock; |
421cb601 | 4371 | } |
48842b30 | 4372 | |
840cb59c | 4373 | health_code_update(); |
86acf0da | 4374 | |
8be98f9a | 4375 | skip_setup: |
a945cdc7 | 4376 | /* This starts the UST tracing */ |
fb45065e | 4377 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4378 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
fb45065e | 4379 | pthread_mutex_unlock(&app->sock_lock); |
421cb601 | 4380 | if (ret < 0) { |
ffe60014 DG |
4381 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4382 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
4383 | app->pid, ret); | |
4384 | } else { | |
4385 | DBG("UST app start session failed. Application is dead."); | |
3757b385 DG |
4386 | /* |
4387 | * This is normal behavior, an application can die during the | |
4388 | * creation process. Don't report an error so the execution can | |
4389 | * continue normally. | |
4390 | */ | |
4391 | pthread_mutex_unlock(&ua_sess->lock); | |
4392 | goto end; | |
ffe60014 | 4393 | } |
d0b96690 | 4394 | goto error_unlock; |
421cb601 | 4395 | } |
5b4a0ec0 | 4396 | |
55c3953d DG |
4397 | /* Indicate that the session has been started once */ |
4398 | ua_sess->started = 1; | |
b0a1c741 | 4399 | ua_sess->enabled = 1; |
55c3953d | 4400 | |
d0b96690 DG |
4401 | pthread_mutex_unlock(&ua_sess->lock); |
4402 | ||
840cb59c | 4403 | health_code_update(); |
86acf0da | 4404 | |
421cb601 | 4405 | /* Quiescent wait after starting trace */ |
fb45065e | 4406 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4407 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4408 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4409 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4410 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4411 | app->pid, ret); | |
4412 | } | |
48842b30 | 4413 | |
e0c7ec2b DG |
4414 | end: |
4415 | rcu_read_unlock(); | |
840cb59c | 4416 | health_code_update(); |
421cb601 | 4417 | return 0; |
48842b30 | 4418 | |
d0b96690 DG |
4419 | error_unlock: |
4420 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 4421 | rcu_read_unlock(); |
840cb59c | 4422 | health_code_update(); |
421cb601 DG |
4423 | return -1; |
4424 | } | |
48842b30 | 4425 | |
8be98f9a MD |
4426 | /* |
4427 | * Stop tracing for a specific UST session and app. | |
4428 | */ | |
b34cbebf | 4429 | static |
8be98f9a MD |
4430 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
4431 | { | |
4432 | int ret = 0; | |
4433 | struct ust_app_session *ua_sess; | |
7972aab2 | 4434 | struct ust_registry_session *registry; |
8be98f9a | 4435 | |
852d0037 | 4436 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
4437 | |
4438 | rcu_read_lock(); | |
4439 | ||
e0c7ec2b | 4440 | if (!app->compatible) { |
d88aee68 | 4441 | goto end_no_session; |
e0c7ec2b DG |
4442 | } |
4443 | ||
8be98f9a MD |
4444 | ua_sess = lookup_session_by_app(usess, app); |
4445 | if (ua_sess == NULL) { | |
d88aee68 | 4446 | goto end_no_session; |
8be98f9a MD |
4447 | } |
4448 | ||
d88aee68 DG |
4449 | pthread_mutex_lock(&ua_sess->lock); |
4450 | ||
b161602a MD |
4451 | if (ua_sess->deleted) { |
4452 | pthread_mutex_unlock(&ua_sess->lock); | |
4453 | goto end_no_session; | |
4454 | } | |
4455 | ||
9bc07046 DG |
4456 | /* |
4457 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
4458 | * that was never started. It's possible since we can have a fail start |
4459 | * from either the application manager thread or the command thread. Simply | |
4460 | * indicate that this is a stop error. | |
9bc07046 | 4461 | */ |
f9dfc3d9 | 4462 | if (!ua_sess->started) { |
c45536e1 DG |
4463 | goto error_rcu_unlock; |
4464 | } | |
7db205b5 | 4465 | |
840cb59c | 4466 | health_code_update(); |
86acf0da | 4467 | |
9d6c7d3f | 4468 | /* This inhibits UST tracing */ |
fb45065e | 4469 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4470 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
fb45065e | 4471 | pthread_mutex_unlock(&app->sock_lock); |
9d6c7d3f | 4472 | if (ret < 0) { |
ffe60014 DG |
4473 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4474 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
4475 | app->pid, ret); | |
4476 | } else { | |
4477 | DBG("UST app stop session failed. Application is dead."); | |
3757b385 DG |
4478 | /* |
4479 | * This is normal behavior, an application can die during the | |
4480 | * creation process. Don't report an error so the execution can | |
4481 | * continue normally. | |
4482 | */ | |
4483 | goto end_unlock; | |
ffe60014 | 4484 | } |
9d6c7d3f DG |
4485 | goto error_rcu_unlock; |
4486 | } | |
4487 | ||
840cb59c | 4488 | health_code_update(); |
b0a1c741 | 4489 | ua_sess->enabled = 0; |
86acf0da | 4490 | |
9d6c7d3f | 4491 | /* Quiescent wait after stopping trace */ |
fb45065e | 4492 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4493 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4494 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4495 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4496 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4497 | app->pid, ret); | |
4498 | } | |
9d6c7d3f | 4499 | |
840cb59c | 4500 | health_code_update(); |
86acf0da | 4501 | |
b34cbebf | 4502 | registry = get_session_registry(ua_sess); |
fad1ed2f JR |
4503 | |
4504 | /* The UST app session is held registry shall not be null. */ | |
b34cbebf | 4505 | assert(registry); |
1b532a60 | 4506 | |
ce34fcd0 MD |
4507 | /* Push metadata for application before freeing the application. */ |
4508 | (void) push_metadata(registry, ua_sess->consumer); | |
b34cbebf | 4509 | |
3757b385 | 4510 | end_unlock: |
b34cbebf MD |
4511 | pthread_mutex_unlock(&ua_sess->lock); |
4512 | end_no_session: | |
4513 | rcu_read_unlock(); | |
4514 | health_code_update(); | |
4515 | return 0; | |
4516 | ||
4517 | error_rcu_unlock: | |
4518 | pthread_mutex_unlock(&ua_sess->lock); | |
4519 | rcu_read_unlock(); | |
4520 | health_code_update(); | |
4521 | return -1; | |
4522 | } | |
4523 | ||
b34cbebf | 4524 | static |
c4b88406 MD |
4525 | int ust_app_flush_app_session(struct ust_app *app, |
4526 | struct ust_app_session *ua_sess) | |
b34cbebf | 4527 | { |
c4b88406 | 4528 | int ret, retval = 0; |
b34cbebf | 4529 | struct lttng_ht_iter iter; |
b34cbebf | 4530 | struct ust_app_channel *ua_chan; |
c4b88406 | 4531 | struct consumer_socket *socket; |
b34cbebf | 4532 | |
c4b88406 | 4533 | DBG("Flushing app session buffers for ust app pid %d", app->pid); |
b34cbebf MD |
4534 | |
4535 | rcu_read_lock(); | |
4536 | ||
4537 | if (!app->compatible) { | |
c4b88406 | 4538 | goto end_not_compatible; |
b34cbebf MD |
4539 | } |
4540 | ||
4541 | pthread_mutex_lock(&ua_sess->lock); | |
4542 | ||
b161602a MD |
4543 | if (ua_sess->deleted) { |
4544 | goto end_deleted; | |
4545 | } | |
4546 | ||
b34cbebf MD |
4547 | health_code_update(); |
4548 | ||
9d6c7d3f | 4549 | /* Flushing buffers */ |
c4b88406 MD |
4550 | socket = consumer_find_socket_by_bitness(app->bits_per_long, |
4551 | ua_sess->consumer); | |
ce34fcd0 MD |
4552 | |
4553 | /* Flush buffers and push metadata. */ | |
4554 | switch (ua_sess->buffer_type) { | |
4555 | case LTTNG_BUFFER_PER_PID: | |
4556 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, | |
4557 | node.node) { | |
4558 | health_code_update(); | |
ce34fcd0 MD |
4559 | ret = consumer_flush_channel(socket, ua_chan->key); |
4560 | if (ret) { | |
4561 | ERR("Error flushing consumer channel"); | |
4562 | retval = -1; | |
4563 | continue; | |
4564 | } | |
8be98f9a | 4565 | } |
ce34fcd0 MD |
4566 | break; |
4567 | case LTTNG_BUFFER_PER_UID: | |
4568 | default: | |
4569 | assert(0); | |
4570 | break; | |
8be98f9a | 4571 | } |
8be98f9a | 4572 | |
840cb59c | 4573 | health_code_update(); |
86acf0da | 4574 | |
b161602a | 4575 | end_deleted: |
d88aee68 | 4576 | pthread_mutex_unlock(&ua_sess->lock); |
ce34fcd0 | 4577 | |
c4b88406 MD |
4578 | end_not_compatible: |
4579 | rcu_read_unlock(); | |
4580 | health_code_update(); | |
4581 | return retval; | |
4582 | } | |
4583 | ||
4584 | /* | |
ce34fcd0 MD |
4585 | * Flush buffers for all applications for a specific UST session. |
4586 | * Called with UST session lock held. | |
c4b88406 MD |
4587 | */ |
4588 | static | |
ce34fcd0 | 4589 | int ust_app_flush_session(struct ltt_ust_session *usess) |
c4b88406 MD |
4590 | |
4591 | { | |
99b1411c | 4592 | int ret = 0; |
c4b88406 | 4593 | |
ce34fcd0 | 4594 | DBG("Flushing session buffers for all ust apps"); |
c4b88406 MD |
4595 | |
4596 | rcu_read_lock(); | |
4597 | ||
ce34fcd0 MD |
4598 | /* Flush buffers and push metadata. */ |
4599 | switch (usess->buffer_type) { | |
4600 | case LTTNG_BUFFER_PER_UID: | |
4601 | { | |
4602 | struct buffer_reg_uid *reg; | |
4603 | struct lttng_ht_iter iter; | |
4604 | ||
4605 | /* Flush all per UID buffers associated to that session. */ | |
4606 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
4607 | struct ust_registry_session *ust_session_reg; | |
4608 | struct buffer_reg_channel *reg_chan; | |
4609 | struct consumer_socket *socket; | |
4610 | ||
4611 | /* Get consumer socket to use to push the metadata.*/ | |
4612 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
4613 | usess->consumer); | |
4614 | if (!socket) { | |
4615 | /* Ignore request if no consumer is found for the session. */ | |
4616 | continue; | |
4617 | } | |
4618 | ||
4619 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
4620 | reg_chan, node.node) { | |
4621 | /* | |
4622 | * The following call will print error values so the return | |
4623 | * code is of little importance because whatever happens, we | |
4624 | * have to try them all. | |
4625 | */ | |
4626 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
4627 | } | |
4628 | ||
4629 | ust_session_reg = reg->registry->reg.ust; | |
4630 | /* Push metadata. */ | |
4631 | (void) push_metadata(ust_session_reg, usess->consumer); | |
4632 | } | |
ce34fcd0 MD |
4633 | break; |
4634 | } | |
4635 | case LTTNG_BUFFER_PER_PID: | |
4636 | { | |
4637 | struct ust_app_session *ua_sess; | |
4638 | struct lttng_ht_iter iter; | |
4639 | struct ust_app *app; | |
4640 | ||
4641 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4642 | ua_sess = lookup_session_by_app(usess, app); | |
4643 | if (ua_sess == NULL) { | |
4644 | continue; | |
4645 | } | |
4646 | (void) ust_app_flush_app_session(app, ua_sess); | |
4647 | } | |
4648 | break; | |
4649 | } | |
4650 | default: | |
99b1411c | 4651 | ret = -1; |
ce34fcd0 MD |
4652 | assert(0); |
4653 | break; | |
c4b88406 | 4654 | } |
c4b88406 | 4655 | |
7db205b5 | 4656 | rcu_read_unlock(); |
840cb59c | 4657 | health_code_update(); |
c4b88406 | 4658 | return ret; |
8be98f9a MD |
4659 | } |
4660 | ||
0dd01979 MD |
4661 | static |
4662 | int ust_app_clear_quiescent_app_session(struct ust_app *app, | |
4663 | struct ust_app_session *ua_sess) | |
4664 | { | |
4665 | int ret = 0; | |
4666 | struct lttng_ht_iter iter; | |
4667 | struct ust_app_channel *ua_chan; | |
4668 | struct consumer_socket *socket; | |
4669 | ||
4670 | DBG("Clearing stream quiescent state for ust app pid %d", app->pid); | |
4671 | ||
4672 | rcu_read_lock(); | |
4673 | ||
4674 | if (!app->compatible) { | |
4675 | goto end_not_compatible; | |
4676 | } | |
4677 | ||
4678 | pthread_mutex_lock(&ua_sess->lock); | |
4679 | ||
4680 | if (ua_sess->deleted) { | |
4681 | goto end_unlock; | |
4682 | } | |
4683 | ||
4684 | health_code_update(); | |
4685 | ||
4686 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
4687 | ua_sess->consumer); | |
4688 | if (!socket) { | |
4689 | ERR("Failed to find consumer (%" PRIu32 ") socket", | |
4690 | app->bits_per_long); | |
4691 | ret = -1; | |
4692 | goto end_unlock; | |
4693 | } | |
4694 | ||
4695 | /* Clear quiescent state. */ | |
4696 | switch (ua_sess->buffer_type) { | |
4697 | case LTTNG_BUFFER_PER_PID: | |
4698 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, | |
4699 | ua_chan, node.node) { | |
4700 | health_code_update(); | |
4701 | ret = consumer_clear_quiescent_channel(socket, | |
4702 | ua_chan->key); | |
4703 | if (ret) { | |
4704 | ERR("Error clearing quiescent state for consumer channel"); | |
4705 | ret = -1; | |
4706 | continue; | |
4707 | } | |
4708 | } | |
4709 | break; | |
4710 | case LTTNG_BUFFER_PER_UID: | |
4711 | default: | |
4712 | assert(0); | |
4713 | ret = -1; | |
4714 | break; | |
4715 | } | |
4716 | ||
4717 | health_code_update(); | |
4718 | ||
4719 | end_unlock: | |
4720 | pthread_mutex_unlock(&ua_sess->lock); | |
4721 | ||
4722 | end_not_compatible: | |
4723 | rcu_read_unlock(); | |
4724 | health_code_update(); | |
4725 | return ret; | |
4726 | } | |
4727 | ||
4728 | /* | |
4729 | * Clear quiescent state in each stream for all applications for a | |
4730 | * specific UST session. | |
4731 | * Called with UST session lock held. | |
4732 | */ | |
4733 | static | |
4734 | int ust_app_clear_quiescent_session(struct ltt_ust_session *usess) | |
4735 | ||
4736 | { | |
4737 | int ret = 0; | |
4738 | ||
4739 | DBG("Clearing stream quiescent state for all ust apps"); | |
4740 | ||
4741 | rcu_read_lock(); | |
4742 | ||
4743 | switch (usess->buffer_type) { | |
4744 | case LTTNG_BUFFER_PER_UID: | |
4745 | { | |
4746 | struct lttng_ht_iter iter; | |
4747 | struct buffer_reg_uid *reg; | |
4748 | ||
4749 | /* | |
4750 | * Clear quiescent for all per UID buffers associated to | |
4751 | * that session. | |
4752 | */ | |
4753 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
4754 | struct consumer_socket *socket; | |
4755 | struct buffer_reg_channel *reg_chan; | |
4756 | ||
4757 | /* Get associated consumer socket.*/ | |
4758 | socket = consumer_find_socket_by_bitness( | |
4759 | reg->bits_per_long, usess->consumer); | |
4760 | if (!socket) { | |
4761 | /* | |
4762 | * Ignore request if no consumer is found for | |
4763 | * the session. | |
4764 | */ | |
4765 | continue; | |
4766 | } | |
4767 | ||
4768 | cds_lfht_for_each_entry(reg->registry->channels->ht, | |
4769 | &iter.iter, reg_chan, node.node) { | |
4770 | /* | |
4771 | * The following call will print error values so | |
4772 | * the return code is of little importance | |
4773 | * because whatever happens, we have to try them | |
4774 | * all. | |
4775 | */ | |
4776 | (void) consumer_clear_quiescent_channel(socket, | |
4777 | reg_chan->consumer_key); | |
4778 | } | |
4779 | } | |
4780 | break; | |
4781 | } | |
4782 | case LTTNG_BUFFER_PER_PID: | |
4783 | { | |
4784 | struct ust_app_session *ua_sess; | |
4785 | struct lttng_ht_iter iter; | |
4786 | struct ust_app *app; | |
4787 | ||
4788 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, | |
4789 | pid_n.node) { | |
4790 | ua_sess = lookup_session_by_app(usess, app); | |
4791 | if (ua_sess == NULL) { | |
4792 | continue; | |
4793 | } | |
4794 | (void) ust_app_clear_quiescent_app_session(app, | |
4795 | ua_sess); | |
4796 | } | |
4797 | break; | |
4798 | } | |
4799 | default: | |
4800 | ret = -1; | |
4801 | assert(0); | |
4802 | break; | |
4803 | } | |
4804 | ||
4805 | rcu_read_unlock(); | |
4806 | health_code_update(); | |
4807 | return ret; | |
4808 | } | |
4809 | ||
84cd17c6 MD |
4810 | /* |
4811 | * Destroy a specific UST session in apps. | |
4812 | */ | |
3353de95 | 4813 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 4814 | { |
ffe60014 | 4815 | int ret; |
84cd17c6 | 4816 | struct ust_app_session *ua_sess; |
bec39940 | 4817 | struct lttng_ht_iter iter; |
d9bf3ca4 | 4818 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 4819 | |
852d0037 | 4820 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
4821 | |
4822 | rcu_read_lock(); | |
4823 | ||
e0c7ec2b DG |
4824 | if (!app->compatible) { |
4825 | goto end; | |
4826 | } | |
4827 | ||
84cd17c6 | 4828 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 4829 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 4830 | if (node == NULL) { |
d42f20df DG |
4831 | /* Session is being or is deleted. */ |
4832 | goto end; | |
84cd17c6 MD |
4833 | } |
4834 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 4835 | |
840cb59c | 4836 | health_code_update(); |
d0b96690 | 4837 | destroy_app_session(app, ua_sess); |
84cd17c6 | 4838 | |
840cb59c | 4839 | health_code_update(); |
7db205b5 | 4840 | |
84cd17c6 | 4841 | /* Quiescent wait after stopping trace */ |
fb45065e | 4842 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4843 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4844 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4845 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4846 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4847 | app->pid, ret); | |
4848 | } | |
e0c7ec2b DG |
4849 | end: |
4850 | rcu_read_unlock(); | |
840cb59c | 4851 | health_code_update(); |
84cd17c6 | 4852 | return 0; |
84cd17c6 MD |
4853 | } |
4854 | ||
5b4a0ec0 DG |
4855 | /* |
4856 | * Start tracing for the UST session. | |
4857 | */ | |
421cb601 DG |
4858 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
4859 | { | |
bec39940 | 4860 | struct lttng_ht_iter iter; |
421cb601 | 4861 | struct ust_app *app; |
48842b30 | 4862 | |
421cb601 DG |
4863 | DBG("Starting all UST traces"); |
4864 | ||
bb2452c8 MD |
4865 | /* |
4866 | * Even though the start trace might fail, flag this session active so | |
4867 | * other application coming in are started by default. | |
4868 | */ | |
4869 | usess->active = 1; | |
4870 | ||
421cb601 | 4871 | rcu_read_lock(); |
421cb601 | 4872 | |
0dd01979 MD |
4873 | /* |
4874 | * In a start-stop-start use-case, we need to clear the quiescent state | |
4875 | * of each channel set by the prior stop command, thus ensuring that a | |
4876 | * following stop or destroy is sure to grab a timestamp_end near those | |
4877 | * operations, even if the packet is empty. | |
4878 | */ | |
4879 | (void) ust_app_clear_quiescent_session(usess); | |
4880 | ||
0498a00c MD |
4881 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4882 | ust_app_global_update(usess, app); | |
4883 | } | |
4884 | ||
48842b30 DG |
4885 | rcu_read_unlock(); |
4886 | ||
4887 | return 0; | |
4888 | } | |
487cf67c | 4889 | |
8be98f9a MD |
4890 | /* |
4891 | * Start tracing for the UST session. | |
ce34fcd0 | 4892 | * Called with UST session lock held. |
8be98f9a MD |
4893 | */ |
4894 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
4895 | { | |
4896 | int ret = 0; | |
bec39940 | 4897 | struct lttng_ht_iter iter; |
8be98f9a MD |
4898 | struct ust_app *app; |
4899 | ||
4900 | DBG("Stopping all UST traces"); | |
4901 | ||
bb2452c8 MD |
4902 | /* |
4903 | * Even though the stop trace might fail, flag this session inactive so | |
4904 | * other application coming in are not started by default. | |
4905 | */ | |
4906 | usess->active = 0; | |
4907 | ||
8be98f9a MD |
4908 | rcu_read_lock(); |
4909 | ||
b34cbebf MD |
4910 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4911 | ret = ust_app_stop_trace(usess, app); | |
4912 | if (ret < 0) { | |
4913 | /* Continue to next apps even on error */ | |
4914 | continue; | |
4915 | } | |
4916 | } | |
4917 | ||
ce34fcd0 | 4918 | (void) ust_app_flush_session(usess); |
8be98f9a MD |
4919 | |
4920 | rcu_read_unlock(); | |
4921 | ||
4922 | return 0; | |
4923 | } | |
4924 | ||
84cd17c6 MD |
4925 | /* |
4926 | * Destroy app UST session. | |
4927 | */ | |
4928 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
4929 | { | |
4930 | int ret = 0; | |
bec39940 | 4931 | struct lttng_ht_iter iter; |
84cd17c6 MD |
4932 | struct ust_app *app; |
4933 | ||
4934 | DBG("Destroy all UST traces"); | |
4935 | ||
4936 | rcu_read_lock(); | |
4937 | ||
852d0037 | 4938 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 4939 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
4940 | if (ret < 0) { |
4941 | /* Continue to next apps even on error */ | |
4942 | continue; | |
4943 | } | |
4944 | } | |
4945 | ||
4946 | rcu_read_unlock(); | |
4947 | ||
4948 | return 0; | |
4949 | } | |
4950 | ||
88e3c2f5 | 4951 | /* The ua_sess lock must be held by the caller. */ |
a9ad0c8f | 4952 | static |
88e3c2f5 JG |
4953 | int find_or_create_ust_app_channel( |
4954 | struct ltt_ust_session *usess, | |
4955 | struct ust_app_session *ua_sess, | |
4956 | struct ust_app *app, | |
4957 | struct ltt_ust_channel *uchan, | |
4958 | struct ust_app_channel **ua_chan) | |
487cf67c | 4959 | { |
55c54cce | 4960 | int ret = 0; |
88e3c2f5 JG |
4961 | struct lttng_ht_iter iter; |
4962 | struct lttng_ht_node_str *ua_chan_node; | |
4963 | ||
4964 | lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &iter); | |
4965 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
4966 | if (ua_chan_node) { | |
4967 | *ua_chan = caa_container_of(ua_chan_node, | |
4968 | struct ust_app_channel, node); | |
4969 | goto end; | |
4970 | } | |
4971 | ||
4972 | ret = ust_app_channel_create(usess, ua_sess, uchan, app, ua_chan); | |
4973 | if (ret) { | |
4974 | goto end; | |
4975 | } | |
4976 | end: | |
4977 | return ret; | |
4978 | } | |
4979 | ||
4980 | static | |
4981 | int ust_app_channel_synchronize_event(struct ust_app_channel *ua_chan, | |
4982 | struct ltt_ust_event *uevent, struct ust_app_session *ua_sess, | |
4983 | struct ust_app *app) | |
4984 | { | |
4985 | int ret = 0; | |
4986 | struct ust_app_event *ua_event = NULL; | |
4987 | ||
4988 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
4989 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); | |
4990 | if (!ua_event) { | |
4991 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); | |
4992 | if (ret < 0) { | |
4993 | goto end; | |
4994 | } | |
4995 | } else { | |
4996 | if (ua_event->enabled != uevent->enabled) { | |
4997 | ret = uevent->enabled ? | |
4998 | enable_ust_app_event(ua_sess, ua_event, app) : | |
4999 | disable_ust_app_event(ua_sess, ua_event, app); | |
5000 | } | |
5001 | } | |
5002 | ||
5003 | end: | |
5004 | return ret; | |
5005 | } | |
5006 | ||
5007 | /* | |
5008 | * The caller must ensure that the application is compatible and is tracked | |
5009 | * by the PID tracker. | |
5010 | */ | |
5011 | static | |
5012 | void ust_app_synchronize(struct ltt_ust_session *usess, | |
5013 | struct ust_app *app) | |
5014 | { | |
5015 | int ret = 0; | |
5016 | struct cds_lfht_iter uchan_iter; | |
5017 | struct ltt_ust_channel *uchan; | |
3d8ca23b | 5018 | struct ust_app_session *ua_sess = NULL; |
1f3580c7 | 5019 | |
88e3c2f5 JG |
5020 | /* |
5021 | * The application's configuration should only be synchronized for | |
5022 | * active sessions. | |
5023 | */ | |
5024 | assert(usess->active); | |
5025 | ||
5026 | ret = find_or_create_ust_app_session(usess, app, &ua_sess, NULL); | |
3d8ca23b DG |
5027 | if (ret < 0) { |
5028 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
5029 | goto error; |
5030 | } | |
3d8ca23b | 5031 | assert(ua_sess); |
487cf67c | 5032 | |
d0b96690 | 5033 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
5034 | if (ua_sess->deleted) { |
5035 | pthread_mutex_unlock(&ua_sess->lock); | |
5036 | goto end; | |
5037 | } | |
5038 | ||
88e3c2f5 JG |
5039 | rcu_read_lock(); |
5040 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &uchan_iter, | |
5041 | uchan, node.node) { | |
5042 | struct ust_app_channel *ua_chan; | |
5043 | struct cds_lfht_iter uevent_iter; | |
5044 | struct ltt_ust_event *uevent; | |
487cf67c | 5045 | |
31746f93 | 5046 | /* |
88e3c2f5 JG |
5047 | * Search for a matching ust_app_channel. If none is found, |
5048 | * create it. Creating the channel will cause the ua_chan | |
5049 | * structure to be allocated, the channel buffers to be | |
5050 | * allocated (if necessary) and sent to the application, and | |
5051 | * all enabled contexts will be added to the channel. | |
31746f93 | 5052 | */ |
88e3c2f5 JG |
5053 | ret = find_or_create_ust_app_channel(usess, ua_sess, |
5054 | app, uchan, &ua_chan); | |
5055 | if (ret) { | |
5056 | /* Tracer is probably gone or ENOMEM. */ | |
5057 | goto error_unlock; | |
727d5404 DG |
5058 | } |
5059 | ||
88e3c2f5 JG |
5060 | if (!ua_chan) { |
5061 | /* ua_chan will be NULL for the metadata channel */ | |
5062 | continue; | |
5063 | } | |
727d5404 | 5064 | |
88e3c2f5 | 5065 | cds_lfht_for_each_entry(uchan->events->ht, &uevent_iter, uevent, |
bec39940 | 5066 | node.node) { |
88e3c2f5 JG |
5067 | ret = ust_app_channel_synchronize_event(ua_chan, |
5068 | uevent, ua_sess, app); | |
5069 | if (ret) { | |
d0b96690 | 5070 | goto error_unlock; |
487cf67c | 5071 | } |
36dc12cc | 5072 | } |
d0b96690 | 5073 | |
88e3c2f5 JG |
5074 | if (ua_chan->enabled != uchan->enabled) { |
5075 | ret = uchan->enabled ? | |
5076 | enable_ust_app_channel(ua_sess, uchan, app) : | |
5077 | disable_ust_app_channel(ua_sess, ua_chan, app); | |
5078 | if (ret) { | |
5079 | goto error_unlock; | |
5080 | } | |
5081 | } | |
36dc12cc | 5082 | } |
88e3c2f5 | 5083 | rcu_read_unlock(); |
0498a00c | 5084 | |
a9ad0c8f | 5085 | end: |
88e3c2f5 | 5086 | pthread_mutex_unlock(&ua_sess->lock); |
ffe60014 | 5087 | /* Everything went well at this point. */ |
ffe60014 DG |
5088 | return; |
5089 | ||
d0b96690 | 5090 | error_unlock: |
88e3c2f5 | 5091 | rcu_read_unlock(); |
d0b96690 | 5092 | pthread_mutex_unlock(&ua_sess->lock); |
487cf67c | 5093 | error: |
ffe60014 | 5094 | if (ua_sess) { |
d0b96690 | 5095 | destroy_app_session(app, ua_sess); |
ffe60014 | 5096 | } |
487cf67c DG |
5097 | return; |
5098 | } | |
55cc08a6 | 5099 | |
a9ad0c8f MD |
5100 | static |
5101 | void ust_app_global_destroy(struct ltt_ust_session *usess, struct ust_app *app) | |
5102 | { | |
5103 | struct ust_app_session *ua_sess; | |
5104 | ||
5105 | ua_sess = lookup_session_by_app(usess, app); | |
5106 | if (ua_sess == NULL) { | |
5107 | return; | |
5108 | } | |
5109 | destroy_app_session(app, ua_sess); | |
5110 | } | |
5111 | ||
5112 | /* | |
5113 | * Add channels/events from UST global domain to registered apps at sock. | |
5114 | * | |
5115 | * Called with session lock held. | |
5116 | * Called with RCU read-side lock held. | |
5117 | */ | |
5118 | void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app) | |
5119 | { | |
5120 | assert(usess); | |
88e3c2f5 | 5121 | assert(usess->active); |
a9ad0c8f MD |
5122 | |
5123 | DBG2("UST app global update for app sock %d for session id %" PRIu64, | |
5124 | app->sock, usess->id); | |
5125 | ||
5126 | if (!app->compatible) { | |
5127 | return; | |
5128 | } | |
55c9e7ca JR |
5129 | if (trace_ust_id_tracker_lookup(LTTNG_TRACKER_VPID, usess, app->pid) && |
5130 | trace_ust_id_tracker_lookup( | |
5131 | LTTNG_TRACKER_VUID, usess, app->uid) && | |
5132 | trace_ust_id_tracker_lookup( | |
5133 | LTTNG_TRACKER_VGID, usess, app->gid)) { | |
88e3c2f5 JG |
5134 | /* |
5135 | * Synchronize the application's internal tracing configuration | |
5136 | * and start tracing. | |
5137 | */ | |
5138 | ust_app_synchronize(usess, app); | |
5139 | ust_app_start_trace(usess, app); | |
a9ad0c8f MD |
5140 | } else { |
5141 | ust_app_global_destroy(usess, app); | |
5142 | } | |
5143 | } | |
5144 | ||
5145 | /* | |
5146 | * Called with session lock held. | |
5147 | */ | |
5148 | void ust_app_global_update_all(struct ltt_ust_session *usess) | |
5149 | { | |
5150 | struct lttng_ht_iter iter; | |
5151 | struct ust_app *app; | |
5152 | ||
5153 | rcu_read_lock(); | |
5154 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5155 | ust_app_global_update(usess, app); | |
5156 | } | |
5157 | rcu_read_unlock(); | |
5158 | } | |
5159 | ||
55cc08a6 DG |
5160 | /* |
5161 | * Add context to a specific channel for global UST domain. | |
5162 | */ | |
5163 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
5164 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
5165 | { | |
5166 | int ret = 0; | |
bec39940 DG |
5167 | struct lttng_ht_node_str *ua_chan_node; |
5168 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
5169 | struct ust_app_channel *ua_chan = NULL; |
5170 | struct ust_app_session *ua_sess; | |
5171 | struct ust_app *app; | |
5172 | ||
88e3c2f5 | 5173 | assert(usess->active); |
0498a00c | 5174 | |
55cc08a6 | 5175 | rcu_read_lock(); |
852d0037 | 5176 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
5177 | if (!app->compatible) { |
5178 | /* | |
5179 | * TODO: In time, we should notice the caller of this error by | |
5180 | * telling him that this is a version error. | |
5181 | */ | |
5182 | continue; | |
5183 | } | |
55cc08a6 DG |
5184 | ua_sess = lookup_session_by_app(usess, app); |
5185 | if (ua_sess == NULL) { | |
5186 | continue; | |
5187 | } | |
5188 | ||
d0b96690 | 5189 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
5190 | |
5191 | if (ua_sess->deleted) { | |
5192 | pthread_mutex_unlock(&ua_sess->lock); | |
5193 | continue; | |
5194 | } | |
5195 | ||
55cc08a6 | 5196 | /* Lookup channel in the ust app session */ |
bec39940 DG |
5197 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
5198 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 5199 | if (ua_chan_node == NULL) { |
d0b96690 | 5200 | goto next_app; |
55cc08a6 DG |
5201 | } |
5202 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
5203 | node); | |
c9edf082 | 5204 | ret = create_ust_app_channel_context(ua_chan, &uctx->ctx, app); |
55cc08a6 | 5205 | if (ret < 0) { |
d0b96690 | 5206 | goto next_app; |
55cc08a6 | 5207 | } |
d0b96690 DG |
5208 | next_app: |
5209 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
5210 | } |
5211 | ||
55cc08a6 | 5212 | rcu_read_unlock(); |
76d45b40 DG |
5213 | return ret; |
5214 | } | |
7f79d3a1 | 5215 | |
d0b96690 DG |
5216 | /* |
5217 | * Receive registration and populate the given msg structure. | |
5218 | * | |
5219 | * On success return 0 else a negative value returned by the ustctl call. | |
5220 | */ | |
5221 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
5222 | { | |
5223 | int ret; | |
5224 | uint32_t pid, ppid, uid, gid; | |
5225 | ||
5226 | assert(msg); | |
5227 | ||
5228 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
5229 | &pid, &ppid, &uid, &gid, | |
5230 | &msg->bits_per_long, | |
5231 | &msg->uint8_t_alignment, | |
5232 | &msg->uint16_t_alignment, | |
5233 | &msg->uint32_t_alignment, | |
5234 | &msg->uint64_t_alignment, | |
5235 | &msg->long_alignment, | |
5236 | &msg->byte_order, | |
5237 | msg->name); | |
5238 | if (ret < 0) { | |
5239 | switch (-ret) { | |
5240 | case EPIPE: | |
5241 | case ECONNRESET: | |
5242 | case LTTNG_UST_ERR_EXITING: | |
5243 | DBG3("UST app recv reg message failed. Application died"); | |
5244 | break; | |
5245 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
5246 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
5247 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
5248 | LTTNG_UST_ABI_MINOR_VERSION); | |
5249 | break; | |
5250 | default: | |
5251 | ERR("UST app recv reg message failed with ret %d", ret); | |
5252 | break; | |
5253 | } | |
5254 | goto error; | |
5255 | } | |
5256 | msg->pid = (pid_t) pid; | |
5257 | msg->ppid = (pid_t) ppid; | |
5258 | msg->uid = (uid_t) uid; | |
5259 | msg->gid = (gid_t) gid; | |
5260 | ||
5261 | error: | |
5262 | return ret; | |
5263 | } | |
5264 | ||
10b56aef MD |
5265 | /* |
5266 | * Return a ust app session object using the application object and the | |
5267 | * session object descriptor has a key. If not found, NULL is returned. | |
5268 | * A RCU read side lock MUST be acquired when calling this function. | |
5269 | */ | |
5270 | static struct ust_app_session *find_session_by_objd(struct ust_app *app, | |
5271 | int objd) | |
5272 | { | |
5273 | struct lttng_ht_node_ulong *node; | |
5274 | struct lttng_ht_iter iter; | |
5275 | struct ust_app_session *ua_sess = NULL; | |
5276 | ||
5277 | assert(app); | |
5278 | ||
5279 | lttng_ht_lookup(app->ust_sessions_objd, (void *)((unsigned long) objd), &iter); | |
5280 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5281 | if (node == NULL) { | |
5282 | DBG2("UST app session find by objd %d not found", objd); | |
5283 | goto error; | |
5284 | } | |
5285 | ||
5286 | ua_sess = caa_container_of(node, struct ust_app_session, ust_objd_node); | |
5287 | ||
5288 | error: | |
5289 | return ua_sess; | |
5290 | } | |
5291 | ||
d88aee68 DG |
5292 | /* |
5293 | * Return a ust app channel object using the application object and the channel | |
5294 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
5295 | * lock MUST be acquired before calling this function. | |
5296 | */ | |
d0b96690 DG |
5297 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
5298 | int objd) | |
5299 | { | |
5300 | struct lttng_ht_node_ulong *node; | |
5301 | struct lttng_ht_iter iter; | |
5302 | struct ust_app_channel *ua_chan = NULL; | |
5303 | ||
5304 | assert(app); | |
5305 | ||
5306 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
5307 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5308 | if (node == NULL) { | |
5309 | DBG2("UST app channel find by objd %d not found", objd); | |
5310 | goto error; | |
5311 | } | |
5312 | ||
5313 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
5314 | ||
5315 | error: | |
5316 | return ua_chan; | |
5317 | } | |
5318 | ||
d88aee68 DG |
5319 | /* |
5320 | * Reply to a register channel notification from an application on the notify | |
5321 | * socket. The channel metadata is also created. | |
5322 | * | |
5323 | * The session UST registry lock is acquired in this function. | |
5324 | * | |
5325 | * On success 0 is returned else a negative value. | |
5326 | */ | |
8eede835 | 5327 | static int reply_ust_register_channel(int sock, int cobjd, |
d0b96690 DG |
5328 | size_t nr_fields, struct ustctl_field *fields) |
5329 | { | |
5330 | int ret, ret_code = 0; | |
294e218e | 5331 | uint32_t chan_id; |
7972aab2 | 5332 | uint64_t chan_reg_key; |
d0b96690 DG |
5333 | enum ustctl_channel_header type; |
5334 | struct ust_app *app; | |
5335 | struct ust_app_channel *ua_chan; | |
5336 | struct ust_app_session *ua_sess; | |
7972aab2 | 5337 | struct ust_registry_session *registry; |
45893984 | 5338 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
5339 | |
5340 | rcu_read_lock(); | |
5341 | ||
5342 | /* Lookup application. If not found, there is a code flow error. */ | |
5343 | app = find_app_by_notify_sock(sock); | |
d88aee68 | 5344 | if (!app) { |
fad1ed2f | 5345 | DBG("Application socket %d is being torn down. Abort event notify", |
d88aee68 DG |
5346 | sock); |
5347 | ret = 0; | |
5348 | goto error_rcu_unlock; | |
5349 | } | |
d0b96690 | 5350 | |
4950b860 | 5351 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 5352 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 | 5353 | if (!ua_chan) { |
fad1ed2f | 5354 | DBG("Application channel is being torn down. Abort event notify"); |
4950b860 MD |
5355 | ret = 0; |
5356 | goto error_rcu_unlock; | |
5357 | } | |
5358 | ||
d0b96690 DG |
5359 | assert(ua_chan->session); |
5360 | ua_sess = ua_chan->session; | |
d0b96690 | 5361 | |
7972aab2 DG |
5362 | /* Get right session registry depending on the session buffer type. */ |
5363 | registry = get_session_registry(ua_sess); | |
fad1ed2f JR |
5364 | if (!registry) { |
5365 | DBG("Application session is being torn down. Abort event notify"); | |
5366 | ret = 0; | |
5367 | goto error_rcu_unlock; | |
5368 | }; | |
45893984 | 5369 | |
7972aab2 DG |
5370 | /* Depending on the buffer type, a different channel key is used. */ |
5371 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
5372 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 5373 | } else { |
7972aab2 | 5374 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
5375 | } |
5376 | ||
7972aab2 DG |
5377 | pthread_mutex_lock(®istry->lock); |
5378 | ||
5379 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
5380 | assert(chan_reg); | |
5381 | ||
5382 | if (!chan_reg->register_done) { | |
294e218e MD |
5383 | /* |
5384 | * TODO: eventually use the registry event count for | |
5385 | * this channel to better guess header type for per-pid | |
5386 | * buffers. | |
5387 | */ | |
5388 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
7972aab2 DG |
5389 | chan_reg->nr_ctx_fields = nr_fields; |
5390 | chan_reg->ctx_fields = fields; | |
fad1ed2f | 5391 | fields = NULL; |
7972aab2 | 5392 | chan_reg->header_type = type; |
d0b96690 | 5393 | } else { |
7972aab2 DG |
5394 | /* Get current already assigned values. */ |
5395 | type = chan_reg->header_type; | |
d0b96690 | 5396 | } |
7972aab2 DG |
5397 | /* Channel id is set during the object creation. */ |
5398 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
5399 | |
5400 | /* Append to metadata */ | |
7972aab2 DG |
5401 | if (!chan_reg->metadata_dumped) { |
5402 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
5403 | if (ret_code) { |
5404 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
5405 | goto reply; | |
5406 | } | |
5407 | } | |
5408 | ||
5409 | reply: | |
7972aab2 DG |
5410 | DBG3("UST app replying to register channel key %" PRIu64 |
5411 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
5412 | ret_code); | |
d0b96690 DG |
5413 | |
5414 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
5415 | if (ret < 0) { | |
5416 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5417 | ERR("UST app reply channel failed with ret %d", ret); | |
5418 | } else { | |
5419 | DBG3("UST app reply channel failed. Application died"); | |
5420 | } | |
5421 | goto error; | |
5422 | } | |
5423 | ||
7972aab2 DG |
5424 | /* This channel registry registration is completed. */ |
5425 | chan_reg->register_done = 1; | |
5426 | ||
d0b96690 | 5427 | error: |
7972aab2 | 5428 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 5429 | error_rcu_unlock: |
d0b96690 | 5430 | rcu_read_unlock(); |
fad1ed2f | 5431 | free(fields); |
d0b96690 DG |
5432 | return ret; |
5433 | } | |
5434 | ||
d88aee68 DG |
5435 | /* |
5436 | * Add event to the UST channel registry. When the event is added to the | |
5437 | * registry, the metadata is also created. Once done, this replies to the | |
5438 | * application with the appropriate error code. | |
5439 | * | |
5440 | * The session UST registry lock is acquired in the function. | |
5441 | * | |
5442 | * On success 0 is returned else a negative value. | |
5443 | */ | |
d0b96690 | 5444 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
2106efa0 PP |
5445 | char *sig, size_t nr_fields, struct ustctl_field *fields, |
5446 | int loglevel_value, char *model_emf_uri) | |
d0b96690 DG |
5447 | { |
5448 | int ret, ret_code; | |
5449 | uint32_t event_id = 0; | |
7972aab2 | 5450 | uint64_t chan_reg_key; |
d0b96690 DG |
5451 | struct ust_app *app; |
5452 | struct ust_app_channel *ua_chan; | |
5453 | struct ust_app_session *ua_sess; | |
7972aab2 | 5454 | struct ust_registry_session *registry; |
d0b96690 DG |
5455 | |
5456 | rcu_read_lock(); | |
5457 | ||
5458 | /* Lookup application. If not found, there is a code flow error. */ | |
5459 | app = find_app_by_notify_sock(sock); | |
d88aee68 | 5460 | if (!app) { |
fad1ed2f | 5461 | DBG("Application socket %d is being torn down. Abort event notify", |
d88aee68 DG |
5462 | sock); |
5463 | ret = 0; | |
5464 | goto error_rcu_unlock; | |
5465 | } | |
d0b96690 | 5466 | |
4950b860 | 5467 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 5468 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 | 5469 | if (!ua_chan) { |
fad1ed2f | 5470 | DBG("Application channel is being torn down. Abort event notify"); |
4950b860 MD |
5471 | ret = 0; |
5472 | goto error_rcu_unlock; | |
5473 | } | |
5474 | ||
d0b96690 DG |
5475 | assert(ua_chan->session); |
5476 | ua_sess = ua_chan->session; | |
5477 | ||
7972aab2 | 5478 | registry = get_session_registry(ua_sess); |
fad1ed2f JR |
5479 | if (!registry) { |
5480 | DBG("Application session is being torn down. Abort event notify"); | |
5481 | ret = 0; | |
5482 | goto error_rcu_unlock; | |
5483 | } | |
7972aab2 DG |
5484 | |
5485 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
5486 | chan_reg_key = ua_chan->tracing_channel_id; | |
5487 | } else { | |
5488 | chan_reg_key = ua_chan->key; | |
5489 | } | |
5490 | ||
5491 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 5492 | |
d5d629b5 DG |
5493 | /* |
5494 | * From this point on, this call acquires the ownership of the sig, fields | |
5495 | * and model_emf_uri meaning any free are done inside it if needed. These | |
5496 | * three variables MUST NOT be read/write after this. | |
5497 | */ | |
7972aab2 | 5498 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
2106efa0 PP |
5499 | sobjd, cobjd, name, sig, nr_fields, fields, |
5500 | loglevel_value, model_emf_uri, ua_sess->buffer_type, | |
5501 | &event_id, app); | |
fad1ed2f JR |
5502 | sig = NULL; |
5503 | fields = NULL; | |
5504 | model_emf_uri = NULL; | |
d0b96690 DG |
5505 | |
5506 | /* | |
5507 | * The return value is returned to ustctl so in case of an error, the | |
5508 | * application can be notified. In case of an error, it's important not to | |
5509 | * return a negative error or else the application will get closed. | |
5510 | */ | |
5511 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
5512 | if (ret < 0) { | |
5513 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5514 | ERR("UST app reply event failed with ret %d", ret); | |
5515 | } else { | |
5516 | DBG3("UST app reply event failed. Application died"); | |
5517 | } | |
5518 | /* | |
5519 | * No need to wipe the create event since the application socket will | |
5520 | * get close on error hence cleaning up everything by itself. | |
5521 | */ | |
5522 | goto error; | |
5523 | } | |
5524 | ||
7972aab2 DG |
5525 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
5526 | name, event_id); | |
d88aee68 | 5527 | |
d0b96690 | 5528 | error: |
7972aab2 | 5529 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 5530 | error_rcu_unlock: |
d0b96690 | 5531 | rcu_read_unlock(); |
fad1ed2f JR |
5532 | free(sig); |
5533 | free(fields); | |
5534 | free(model_emf_uri); | |
d0b96690 DG |
5535 | return ret; |
5536 | } | |
5537 | ||
10b56aef MD |
5538 | /* |
5539 | * Add enum to the UST session registry. Once done, this replies to the | |
5540 | * application with the appropriate error code. | |
5541 | * | |
5542 | * The session UST registry lock is acquired within this function. | |
5543 | * | |
5544 | * On success 0 is returned else a negative value. | |
5545 | */ | |
5546 | static int add_enum_ust_registry(int sock, int sobjd, char *name, | |
5547 | struct ustctl_enum_entry *entries, size_t nr_entries) | |
5548 | { | |
5549 | int ret = 0, ret_code; | |
5550 | struct ust_app *app; | |
5551 | struct ust_app_session *ua_sess; | |
5552 | struct ust_registry_session *registry; | |
5553 | uint64_t enum_id = -1ULL; | |
5554 | ||
5555 | rcu_read_lock(); | |
5556 | ||
5557 | /* Lookup application. If not found, there is a code flow error. */ | |
5558 | app = find_app_by_notify_sock(sock); | |
5559 | if (!app) { | |
5560 | /* Return an error since this is not an error */ | |
5561 | DBG("Application socket %d is being torn down. Aborting enum registration", | |
5562 | sock); | |
5563 | free(entries); | |
5564 | goto error_rcu_unlock; | |
5565 | } | |
5566 | ||
5567 | /* Lookup session by UST object descriptor. */ | |
5568 | ua_sess = find_session_by_objd(app, sobjd); | |
5569 | if (!ua_sess) { | |
5570 | /* Return an error since this is not an error */ | |
fad1ed2f | 5571 | DBG("Application session is being torn down (session not found). Aborting enum registration."); |
10b56aef MD |
5572 | free(entries); |
5573 | goto error_rcu_unlock; | |
5574 | } | |
5575 | ||
5576 | registry = get_session_registry(ua_sess); | |
fad1ed2f JR |
5577 | if (!registry) { |
5578 | DBG("Application session is being torn down (registry not found). Aborting enum registration."); | |
5579 | free(entries); | |
5580 | goto error_rcu_unlock; | |
5581 | } | |
10b56aef MD |
5582 | |
5583 | pthread_mutex_lock(®istry->lock); | |
5584 | ||
5585 | /* | |
5586 | * From this point on, the callee acquires the ownership of | |
5587 | * entries. The variable entries MUST NOT be read/written after | |
5588 | * call. | |
5589 | */ | |
5590 | ret_code = ust_registry_create_or_find_enum(registry, sobjd, name, | |
5591 | entries, nr_entries, &enum_id); | |
5592 | entries = NULL; | |
5593 | ||
5594 | /* | |
5595 | * The return value is returned to ustctl so in case of an error, the | |
5596 | * application can be notified. In case of an error, it's important not to | |
5597 | * return a negative error or else the application will get closed. | |
5598 | */ | |
5599 | ret = ustctl_reply_register_enum(sock, enum_id, ret_code); | |
5600 | if (ret < 0) { | |
5601 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5602 | ERR("UST app reply enum failed with ret %d", ret); | |
5603 | } else { | |
5604 | DBG3("UST app reply enum failed. Application died"); | |
5605 | } | |
5606 | /* | |
5607 | * No need to wipe the create enum since the application socket will | |
5608 | * get close on error hence cleaning up everything by itself. | |
5609 | */ | |
5610 | goto error; | |
5611 | } | |
5612 | ||
5613 | DBG3("UST registry enum %s added successfully or already found", name); | |
5614 | ||
5615 | error: | |
5616 | pthread_mutex_unlock(®istry->lock); | |
5617 | error_rcu_unlock: | |
5618 | rcu_read_unlock(); | |
5619 | return ret; | |
5620 | } | |
5621 | ||
d88aee68 DG |
5622 | /* |
5623 | * Handle application notification through the given notify socket. | |
5624 | * | |
5625 | * Return 0 on success or else a negative value. | |
5626 | */ | |
d0b96690 DG |
5627 | int ust_app_recv_notify(int sock) |
5628 | { | |
5629 | int ret; | |
5630 | enum ustctl_notify_cmd cmd; | |
5631 | ||
5632 | DBG3("UST app receiving notify from sock %d", sock); | |
5633 | ||
5634 | ret = ustctl_recv_notify(sock, &cmd); | |
5635 | if (ret < 0) { | |
5636 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5637 | ERR("UST app recv notify failed with ret %d", ret); | |
5638 | } else { | |
5639 | DBG3("UST app recv notify failed. Application died"); | |
5640 | } | |
5641 | goto error; | |
5642 | } | |
5643 | ||
5644 | switch (cmd) { | |
5645 | case USTCTL_NOTIFY_CMD_EVENT: | |
5646 | { | |
2106efa0 | 5647 | int sobjd, cobjd, loglevel_value; |
d0b96690 DG |
5648 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; |
5649 | size_t nr_fields; | |
5650 | struct ustctl_field *fields; | |
5651 | ||
5652 | DBG2("UST app ustctl register event received"); | |
5653 | ||
2106efa0 PP |
5654 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, |
5655 | &loglevel_value, &sig, &nr_fields, &fields, | |
5656 | &model_emf_uri); | |
d0b96690 DG |
5657 | if (ret < 0) { |
5658 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5659 | ERR("UST app recv event failed with ret %d", ret); | |
5660 | } else { | |
5661 | DBG3("UST app recv event failed. Application died"); | |
5662 | } | |
5663 | goto error; | |
5664 | } | |
5665 | ||
d5d629b5 DG |
5666 | /* |
5667 | * Add event to the UST registry coming from the notify socket. This | |
5668 | * call will free if needed the sig, fields and model_emf_uri. This | |
5669 | * code path loses the ownsership of these variables and transfer them | |
5670 | * to the this function. | |
5671 | */ | |
d0b96690 | 5672 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
2106efa0 | 5673 | fields, loglevel_value, model_emf_uri); |
d0b96690 DG |
5674 | if (ret < 0) { |
5675 | goto error; | |
5676 | } | |
5677 | ||
5678 | break; | |
5679 | } | |
5680 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
5681 | { | |
5682 | int sobjd, cobjd; | |
5683 | size_t nr_fields; | |
5684 | struct ustctl_field *fields; | |
5685 | ||
5686 | DBG2("UST app ustctl register channel received"); | |
5687 | ||
5688 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
5689 | &fields); | |
5690 | if (ret < 0) { | |
5691 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5692 | ERR("UST app recv channel failed with ret %d", ret); | |
5693 | } else { | |
5694 | DBG3("UST app recv channel failed. Application died"); | |
5695 | } | |
5696 | goto error; | |
5697 | } | |
5698 | ||
d5d629b5 DG |
5699 | /* |
5700 | * The fields ownership are transfered to this function call meaning | |
5701 | * that if needed it will be freed. After this, it's invalid to access | |
5702 | * fields or clean it up. | |
5703 | */ | |
8eede835 | 5704 | ret = reply_ust_register_channel(sock, cobjd, nr_fields, |
d0b96690 DG |
5705 | fields); |
5706 | if (ret < 0) { | |
5707 | goto error; | |
5708 | } | |
5709 | ||
5710 | break; | |
5711 | } | |
10b56aef MD |
5712 | case USTCTL_NOTIFY_CMD_ENUM: |
5713 | { | |
5714 | int sobjd; | |
5715 | char name[LTTNG_UST_SYM_NAME_LEN]; | |
5716 | size_t nr_entries; | |
5717 | struct ustctl_enum_entry *entries; | |
5718 | ||
5719 | DBG2("UST app ustctl register enum received"); | |
5720 | ||
5721 | ret = ustctl_recv_register_enum(sock, &sobjd, name, | |
5722 | &entries, &nr_entries); | |
5723 | if (ret < 0) { | |
5724 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5725 | ERR("UST app recv enum failed with ret %d", ret); | |
5726 | } else { | |
5727 | DBG3("UST app recv enum failed. Application died"); | |
5728 | } | |
5729 | goto error; | |
5730 | } | |
5731 | ||
5732 | /* Callee assumes ownership of entries */ | |
5733 | ret = add_enum_ust_registry(sock, sobjd, name, | |
5734 | entries, nr_entries); | |
5735 | if (ret < 0) { | |
5736 | goto error; | |
5737 | } | |
5738 | ||
5739 | break; | |
5740 | } | |
d0b96690 DG |
5741 | default: |
5742 | /* Should NEVER happen. */ | |
5743 | assert(0); | |
5744 | } | |
5745 | ||
5746 | error: | |
5747 | return ret; | |
5748 | } | |
d88aee68 DG |
5749 | |
5750 | /* | |
5751 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
5752 | * corresponding application. On failure, the call_rcu to close the socket is | |
5753 | * executed. If an application is found, it tries to delete it from the notify | |
5754 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
5755 | * | |
5756 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
5757 | * call RCU is not done but the rest of the cleanup is. | |
5758 | */ | |
5759 | void ust_app_notify_sock_unregister(int sock) | |
5760 | { | |
5761 | int err_enomem = 0; | |
5762 | struct lttng_ht_iter iter; | |
5763 | struct ust_app *app; | |
5764 | struct ust_app_notify_sock_obj *obj; | |
5765 | ||
5766 | assert(sock >= 0); | |
5767 | ||
5768 | rcu_read_lock(); | |
5769 | ||
5770 | obj = zmalloc(sizeof(*obj)); | |
5771 | if (!obj) { | |
5772 | /* | |
5773 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
5774 | * procedure but the call_rcu will not be called. In this case, we | |
5775 | * accept the fd leak rather than possibly creating an unsynchronized | |
5776 | * state between threads. | |
5777 | * | |
5778 | * TODO: The notify object should be created once the notify socket is | |
5779 | * registered and stored independantely from the ust app object. The | |
5780 | * tricky part is to synchronize the teardown of the application and | |
5781 | * this notify object. Let's keep that in mind so we can avoid this | |
5782 | * kind of shenanigans with ENOMEM in the teardown path. | |
5783 | */ | |
5784 | err_enomem = 1; | |
5785 | } else { | |
5786 | obj->fd = sock; | |
5787 | } | |
5788 | ||
5789 | DBG("UST app notify socket unregister %d", sock); | |
5790 | ||
5791 | /* | |
5792 | * Lookup application by notify socket. If this fails, this means that the | |
5793 | * hash table delete has already been done by the application | |
5794 | * unregistration process so we can safely close the notify socket in a | |
5795 | * call RCU. | |
5796 | */ | |
5797 | app = find_app_by_notify_sock(sock); | |
5798 | if (!app) { | |
5799 | goto close_socket; | |
5800 | } | |
5801 | ||
5802 | iter.iter.node = &app->notify_sock_n.node; | |
5803 | ||
5804 | /* | |
5805 | * Whatever happens here either we fail or succeed, in both cases we have | |
5806 | * to close the socket after a grace period to continue to the call RCU | |
5807 | * here. If the deletion is successful, the application is not visible | |
5808 | * anymore by other threads and is it fails it means that it was already | |
5809 | * deleted from the hash table so either way we just have to close the | |
5810 | * socket. | |
5811 | */ | |
5812 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
5813 | ||
5814 | close_socket: | |
5815 | rcu_read_unlock(); | |
5816 | ||
5817 | /* | |
5818 | * Close socket after a grace period to avoid for the socket to be reused | |
5819 | * before the application object is freed creating potential race between | |
5820 | * threads trying to add unique in the global hash table. | |
5821 | */ | |
5822 | if (!err_enomem) { | |
5823 | call_rcu(&obj->head, close_notify_sock_rcu); | |
5824 | } | |
5825 | } | |
f45e313d DG |
5826 | |
5827 | /* | |
5828 | * Destroy a ust app data structure and free its memory. | |
5829 | */ | |
5830 | void ust_app_destroy(struct ust_app *app) | |
5831 | { | |
5832 | if (!app) { | |
5833 | return; | |
5834 | } | |
5835 | ||
5836 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
5837 | } | |
6dc3064a DG |
5838 | |
5839 | /* | |
5840 | * Take a snapshot for a given UST session. The snapshot is sent to the given | |
5841 | * output. | |
5842 | * | |
9a654598 | 5843 | * Returns LTTNG_OK on success or a LTTNG_ERR error code. |
6dc3064a | 5844 | */ |
fb9a95c4 JG |
5845 | enum lttng_error_code ust_app_snapshot_record( |
5846 | const struct ltt_ust_session *usess, | |
348a81dc | 5847 | const struct consumer_output *output, int wait, |
d07ceecd | 5848 | uint64_t nb_packets_per_stream) |
6dc3064a DG |
5849 | { |
5850 | int ret = 0; | |
9a654598 | 5851 | enum lttng_error_code status = LTTNG_OK; |
6dc3064a DG |
5852 | struct lttng_ht_iter iter; |
5853 | struct ust_app *app; | |
affce97e | 5854 | char *trace_path = NULL; |
6dc3064a DG |
5855 | |
5856 | assert(usess); | |
5857 | assert(output); | |
5858 | ||
5859 | rcu_read_lock(); | |
5860 | ||
8c924c7b MD |
5861 | switch (usess->buffer_type) { |
5862 | case LTTNG_BUFFER_PER_UID: | |
5863 | { | |
5864 | struct buffer_reg_uid *reg; | |
6dc3064a | 5865 | |
8c924c7b MD |
5866 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
5867 | struct buffer_reg_channel *reg_chan; | |
5868 | struct consumer_socket *socket; | |
3b967712 | 5869 | char pathname[PATH_MAX]; |
5da88b0f | 5870 | size_t consumer_path_offset = 0; |
6dc3064a | 5871 | |
2b269489 JR |
5872 | if (!reg->registry->reg.ust->metadata_key) { |
5873 | /* Skip since no metadata is present */ | |
5874 | continue; | |
5875 | } | |
5876 | ||
8c924c7b MD |
5877 | /* Get consumer socket to use to push the metadata.*/ |
5878 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
5879 | usess->consumer); | |
5880 | if (!socket) { | |
9a654598 | 5881 | status = LTTNG_ERR_INVALID; |
8c924c7b MD |
5882 | goto error; |
5883 | } | |
6dc3064a | 5884 | |
8c924c7b MD |
5885 | memset(pathname, 0, sizeof(pathname)); |
5886 | ret = snprintf(pathname, sizeof(pathname), | |
5da88b0f | 5887 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH, |
8c924c7b MD |
5888 | reg->uid, reg->bits_per_long); |
5889 | if (ret < 0) { | |
5890 | PERROR("snprintf snapshot path"); | |
9a654598 | 5891 | status = LTTNG_ERR_INVALID; |
8c924c7b MD |
5892 | goto error; |
5893 | } | |
affce97e JG |
5894 | /* Free path allowed on previous iteration. */ |
5895 | free(trace_path); | |
5da88b0f MD |
5896 | trace_path = setup_channel_trace_path(usess->consumer, pathname, |
5897 | &consumer_path_offset); | |
3b967712 MD |
5898 | if (!trace_path) { |
5899 | status = LTTNG_ERR_INVALID; | |
5900 | goto error; | |
5901 | } | |
d2956687 | 5902 | /* Add the UST default trace dir to path. */ |
8c924c7b MD |
5903 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
5904 | reg_chan, node.node) { | |
9a654598 | 5905 | status = consumer_snapshot_channel(socket, |
e098433c JG |
5906 | reg_chan->consumer_key, |
5907 | output, 0, usess->uid, | |
5da88b0f | 5908 | usess->gid, &trace_path[consumer_path_offset], wait, |
d2956687 | 5909 | nb_packets_per_stream); |
9a654598 | 5910 | if (status != LTTNG_OK) { |
8c924c7b MD |
5911 | goto error; |
5912 | } | |
5913 | } | |
9a654598 | 5914 | status = consumer_snapshot_channel(socket, |
68808f4e | 5915 | reg->registry->reg.ust->metadata_key, output, 1, |
5da88b0f MD |
5916 | usess->uid, usess->gid, &trace_path[consumer_path_offset], |
5917 | wait, 0); | |
9a654598 | 5918 | if (status != LTTNG_OK) { |
8c924c7b MD |
5919 | goto error; |
5920 | } | |
af706bb7 | 5921 | } |
8c924c7b MD |
5922 | break; |
5923 | } | |
5924 | case LTTNG_BUFFER_PER_PID: | |
5925 | { | |
5926 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5927 | struct consumer_socket *socket; | |
5928 | struct lttng_ht_iter chan_iter; | |
5929 | struct ust_app_channel *ua_chan; | |
5930 | struct ust_app_session *ua_sess; | |
5931 | struct ust_registry_session *registry; | |
3b967712 | 5932 | char pathname[PATH_MAX]; |
5da88b0f | 5933 | size_t consumer_path_offset = 0; |
8c924c7b MD |
5934 | |
5935 | ua_sess = lookup_session_by_app(usess, app); | |
5936 | if (!ua_sess) { | |
5937 | /* Session not associated with this app. */ | |
5938 | continue; | |
5939 | } | |
af706bb7 | 5940 | |
8c924c7b MD |
5941 | /* Get the right consumer socket for the application. */ |
5942 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
348a81dc | 5943 | output); |
8c924c7b | 5944 | if (!socket) { |
9a654598 | 5945 | status = LTTNG_ERR_INVALID; |
5c786ded JD |
5946 | goto error; |
5947 | } | |
5948 | ||
8c924c7b MD |
5949 | /* Add the UST default trace dir to path. */ |
5950 | memset(pathname, 0, sizeof(pathname)); | |
5da88b0f | 5951 | ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "/%s", |
8c924c7b | 5952 | ua_sess->path); |
6dc3064a | 5953 | if (ret < 0) { |
9a654598 | 5954 | status = LTTNG_ERR_INVALID; |
8c924c7b | 5955 | PERROR("snprintf snapshot path"); |
6dc3064a DG |
5956 | goto error; |
5957 | } | |
affce97e JG |
5958 | /* Free path allowed on previous iteration. */ |
5959 | free(trace_path); | |
5da88b0f MD |
5960 | trace_path = setup_channel_trace_path(usess->consumer, pathname, |
5961 | &consumer_path_offset); | |
3b967712 MD |
5962 | if (!trace_path) { |
5963 | status = LTTNG_ERR_INVALID; | |
5964 | goto error; | |
5965 | } | |
d2956687 | 5966 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, |
8c924c7b | 5967 | ua_chan, node.node) { |
9a654598 | 5968 | status = consumer_snapshot_channel(socket, |
470cc211 JG |
5969 | ua_chan->key, output, 0, |
5970 | ua_sess->effective_credentials | |
5971 | .uid, | |
5972 | ua_sess->effective_credentials | |
5973 | .gid, | |
5da88b0f | 5974 | &trace_path[consumer_path_offset], wait, |
d2956687 | 5975 | nb_packets_per_stream); |
9a654598 JG |
5976 | switch (status) { |
5977 | case LTTNG_OK: | |
5978 | break; | |
5979 | case LTTNG_ERR_CHAN_NOT_FOUND: | |
5980 | continue; | |
5981 | default: | |
8c924c7b MD |
5982 | goto error; |
5983 | } | |
5984 | } | |
5985 | ||
5986 | registry = get_session_registry(ua_sess); | |
fad1ed2f | 5987 | if (!registry) { |
9bbfb88c MD |
5988 | DBG("Application session is being torn down. Skip application."); |
5989 | continue; | |
fad1ed2f | 5990 | } |
9a654598 | 5991 | status = consumer_snapshot_channel(socket, |
470cc211 JG |
5992 | registry->metadata_key, output, 1, |
5993 | ua_sess->effective_credentials.uid, | |
5994 | ua_sess->effective_credentials.gid, | |
5da88b0f | 5995 | &trace_path[consumer_path_offset], wait, 0); |
9a654598 JG |
5996 | switch (status) { |
5997 | case LTTNG_OK: | |
5998 | break; | |
5999 | case LTTNG_ERR_CHAN_NOT_FOUND: | |
6000 | continue; | |
6001 | default: | |
8c924c7b MD |
6002 | goto error; |
6003 | } | |
6004 | } | |
6005 | break; | |
6006 | } | |
6007 | default: | |
6008 | assert(0); | |
6009 | break; | |
6dc3064a DG |
6010 | } |
6011 | ||
6012 | error: | |
affce97e | 6013 | free(trace_path); |
6dc3064a | 6014 | rcu_read_unlock(); |
9a654598 | 6015 | return status; |
6dc3064a | 6016 | } |
5c786ded JD |
6017 | |
6018 | /* | |
d07ceecd | 6019 | * Return the size taken by one more packet per stream. |
5c786ded | 6020 | */ |
fb9a95c4 JG |
6021 | uint64_t ust_app_get_size_one_more_packet_per_stream( |
6022 | const struct ltt_ust_session *usess, uint64_t cur_nr_packets) | |
5c786ded | 6023 | { |
d07ceecd | 6024 | uint64_t tot_size = 0; |
5c786ded JD |
6025 | struct ust_app *app; |
6026 | struct lttng_ht_iter iter; | |
6027 | ||
6028 | assert(usess); | |
6029 | ||
6030 | switch (usess->buffer_type) { | |
6031 | case LTTNG_BUFFER_PER_UID: | |
6032 | { | |
6033 | struct buffer_reg_uid *reg; | |
6034 | ||
6035 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
6036 | struct buffer_reg_channel *reg_chan; | |
6037 | ||
b7064eaa | 6038 | rcu_read_lock(); |
5c786ded JD |
6039 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
6040 | reg_chan, node.node) { | |
d07ceecd MD |
6041 | if (cur_nr_packets >= reg_chan->num_subbuf) { |
6042 | /* | |
6043 | * Don't take channel into account if we | |
6044 | * already grab all its packets. | |
6045 | */ | |
6046 | continue; | |
6047 | } | |
6048 | tot_size += reg_chan->subbuf_size * reg_chan->stream_count; | |
5c786ded | 6049 | } |
b7064eaa | 6050 | rcu_read_unlock(); |
5c786ded JD |
6051 | } |
6052 | break; | |
6053 | } | |
6054 | case LTTNG_BUFFER_PER_PID: | |
6055 | { | |
6056 | rcu_read_lock(); | |
6057 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6058 | struct ust_app_channel *ua_chan; | |
6059 | struct ust_app_session *ua_sess; | |
6060 | struct lttng_ht_iter chan_iter; | |
6061 | ||
6062 | ua_sess = lookup_session_by_app(usess, app); | |
6063 | if (!ua_sess) { | |
6064 | /* Session not associated with this app. */ | |
6065 | continue; | |
6066 | } | |
6067 | ||
6068 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
6069 | ua_chan, node.node) { | |
d07ceecd MD |
6070 | if (cur_nr_packets >= ua_chan->attr.num_subbuf) { |
6071 | /* | |
6072 | * Don't take channel into account if we | |
6073 | * already grab all its packets. | |
6074 | */ | |
6075 | continue; | |
6076 | } | |
6077 | tot_size += ua_chan->attr.subbuf_size * ua_chan->streams.count; | |
5c786ded JD |
6078 | } |
6079 | } | |
6080 | rcu_read_unlock(); | |
6081 | break; | |
6082 | } | |
6083 | default: | |
6084 | assert(0); | |
6085 | break; | |
6086 | } | |
6087 | ||
d07ceecd | 6088 | return tot_size; |
5c786ded | 6089 | } |
fb83fe64 JD |
6090 | |
6091 | int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id, | |
6092 | struct cds_list_head *buffer_reg_uid_list, | |
6093 | struct consumer_output *consumer, uint64_t uchan_id, | |
6094 | int overwrite, uint64_t *discarded, uint64_t *lost) | |
6095 | { | |
6096 | int ret; | |
6097 | uint64_t consumer_chan_key; | |
6098 | ||
70dd8162 MD |
6099 | *discarded = 0; |
6100 | *lost = 0; | |
6101 | ||
fb83fe64 | 6102 | ret = buffer_reg_uid_consumer_channel_key( |
76604852 | 6103 | buffer_reg_uid_list, uchan_id, &consumer_chan_key); |
fb83fe64 | 6104 | if (ret < 0) { |
70dd8162 MD |
6105 | /* Not found */ |
6106 | ret = 0; | |
fb83fe64 JD |
6107 | goto end; |
6108 | } | |
6109 | ||
6110 | if (overwrite) { | |
6111 | ret = consumer_get_lost_packets(ust_session_id, | |
6112 | consumer_chan_key, consumer, lost); | |
6113 | } else { | |
6114 | ret = consumer_get_discarded_events(ust_session_id, | |
6115 | consumer_chan_key, consumer, discarded); | |
6116 | } | |
6117 | ||
6118 | end: | |
6119 | return ret; | |
6120 | } | |
6121 | ||
6122 | int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess, | |
6123 | struct ltt_ust_channel *uchan, | |
6124 | struct consumer_output *consumer, int overwrite, | |
6125 | uint64_t *discarded, uint64_t *lost) | |
6126 | { | |
6127 | int ret = 0; | |
6128 | struct lttng_ht_iter iter; | |
6129 | struct lttng_ht_node_str *ua_chan_node; | |
6130 | struct ust_app *app; | |
6131 | struct ust_app_session *ua_sess; | |
6132 | struct ust_app_channel *ua_chan; | |
6133 | ||
70dd8162 MD |
6134 | *discarded = 0; |
6135 | *lost = 0; | |
6136 | ||
fb83fe64 JD |
6137 | rcu_read_lock(); |
6138 | /* | |
70dd8162 MD |
6139 | * Iterate over every registered applications. Sum counters for |
6140 | * all applications containing requested session and channel. | |
fb83fe64 JD |
6141 | */ |
6142 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6143 | struct lttng_ht_iter uiter; | |
6144 | ||
6145 | ua_sess = lookup_session_by_app(usess, app); | |
6146 | if (ua_sess == NULL) { | |
6147 | continue; | |
6148 | } | |
6149 | ||
6150 | /* Get channel */ | |
ee022399 | 6151 | lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &uiter); |
fb83fe64 JD |
6152 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); |
6153 | /* If the session is found for the app, the channel must be there */ | |
6154 | assert(ua_chan_node); | |
6155 | ||
6156 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
6157 | ||
6158 | if (overwrite) { | |
70dd8162 MD |
6159 | uint64_t _lost; |
6160 | ||
fb83fe64 | 6161 | ret = consumer_get_lost_packets(usess->id, ua_chan->key, |
70dd8162 MD |
6162 | consumer, &_lost); |
6163 | if (ret < 0) { | |
6164 | break; | |
6165 | } | |
6166 | (*lost) += _lost; | |
fb83fe64 | 6167 | } else { |
70dd8162 MD |
6168 | uint64_t _discarded; |
6169 | ||
fb83fe64 | 6170 | ret = consumer_get_discarded_events(usess->id, |
70dd8162 MD |
6171 | ua_chan->key, consumer, &_discarded); |
6172 | if (ret < 0) { | |
6173 | break; | |
6174 | } | |
6175 | (*discarded) += _discarded; | |
fb83fe64 | 6176 | } |
fb83fe64 JD |
6177 | } |
6178 | ||
fb83fe64 JD |
6179 | rcu_read_unlock(); |
6180 | return ret; | |
6181 | } | |
c2561365 JD |
6182 | |
6183 | static | |
6184 | int ust_app_regenerate_statedump(struct ltt_ust_session *usess, | |
6185 | struct ust_app *app) | |
6186 | { | |
6187 | int ret = 0; | |
6188 | struct ust_app_session *ua_sess; | |
6189 | ||
6190 | DBG("Regenerating the metadata for ust app pid %d", app->pid); | |
6191 | ||
6192 | rcu_read_lock(); | |
6193 | ||
6194 | ua_sess = lookup_session_by_app(usess, app); | |
6195 | if (ua_sess == NULL) { | |
6196 | /* The session is in teardown process. Ignore and continue. */ | |
6197 | goto end; | |
6198 | } | |
6199 | ||
6200 | pthread_mutex_lock(&ua_sess->lock); | |
6201 | ||
6202 | if (ua_sess->deleted) { | |
6203 | goto end_unlock; | |
6204 | } | |
6205 | ||
6206 | pthread_mutex_lock(&app->sock_lock); | |
6207 | ret = ustctl_regenerate_statedump(app->sock, ua_sess->handle); | |
6208 | pthread_mutex_unlock(&app->sock_lock); | |
6209 | ||
6210 | end_unlock: | |
6211 | pthread_mutex_unlock(&ua_sess->lock); | |
6212 | ||
6213 | end: | |
6214 | rcu_read_unlock(); | |
6215 | health_code_update(); | |
6216 | return ret; | |
6217 | } | |
6218 | ||
6219 | /* | |
6220 | * Regenerate the statedump for each app in the session. | |
6221 | */ | |
6222 | int ust_app_regenerate_statedump_all(struct ltt_ust_session *usess) | |
6223 | { | |
6224 | int ret = 0; | |
6225 | struct lttng_ht_iter iter; | |
6226 | struct ust_app *app; | |
6227 | ||
6228 | DBG("Regenerating the metadata for all UST apps"); | |
6229 | ||
6230 | rcu_read_lock(); | |
6231 | ||
6232 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6233 | if (!app->compatible) { | |
6234 | continue; | |
6235 | } | |
6236 | ||
6237 | ret = ust_app_regenerate_statedump(usess, app); | |
6238 | if (ret < 0) { | |
6239 | /* Continue to the next app even on error */ | |
6240 | continue; | |
6241 | } | |
6242 | } | |
6243 | ||
6244 | rcu_read_unlock(); | |
6245 | ||
6246 | return 0; | |
6247 | } | |
5c408ad8 JD |
6248 | |
6249 | /* | |
6250 | * Rotate all the channels of a session. | |
6251 | * | |
6f6d3b69 | 6252 | * Return LTTNG_OK on success or else an LTTng error code. |
5c408ad8 | 6253 | */ |
6f6d3b69 | 6254 | enum lttng_error_code ust_app_rotate_session(struct ltt_session *session) |
5c408ad8 | 6255 | { |
6f6d3b69 MD |
6256 | int ret; |
6257 | enum lttng_error_code cmd_ret = LTTNG_OK; | |
5c408ad8 JD |
6258 | struct lttng_ht_iter iter; |
6259 | struct ust_app *app; | |
6260 | struct ltt_ust_session *usess = session->ust_session; | |
5c408ad8 JD |
6261 | |
6262 | assert(usess); | |
6263 | ||
6264 | rcu_read_lock(); | |
6265 | ||
6266 | switch (usess->buffer_type) { | |
6267 | case LTTNG_BUFFER_PER_UID: | |
6268 | { | |
6269 | struct buffer_reg_uid *reg; | |
6270 | ||
6271 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
6272 | struct buffer_reg_channel *reg_chan; | |
6273 | struct consumer_socket *socket; | |
6274 | ||
14d3fca9 JR |
6275 | if (!reg->registry->reg.ust->metadata_key) { |
6276 | /* Skip since no metadata is present */ | |
6277 | continue; | |
6278 | } | |
6279 | ||
5c408ad8 JD |
6280 | /* Get consumer socket to use to push the metadata.*/ |
6281 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
6282 | usess->consumer); | |
6283 | if (!socket) { | |
6f6d3b69 | 6284 | cmd_ret = LTTNG_ERR_INVALID; |
5c408ad8 JD |
6285 | goto error; |
6286 | } | |
6287 | ||
5c408ad8 JD |
6288 | /* Rotate the data channels. */ |
6289 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
6290 | reg_chan, node.node) { | |
5c408ad8 JD |
6291 | ret = consumer_rotate_channel(socket, |
6292 | reg_chan->consumer_key, | |
6293 | usess->uid, usess->gid, | |
d2956687 JG |
6294 | usess->consumer, |
6295 | /* is_metadata_channel */ false); | |
5c408ad8 | 6296 | if (ret < 0) { |
6f6d3b69 | 6297 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
6298 | goto error; |
6299 | } | |
6300 | } | |
6301 | ||
6302 | (void) push_metadata(reg->registry->reg.ust, usess->consumer); | |
6303 | ||
6304 | ret = consumer_rotate_channel(socket, | |
6305 | reg->registry->reg.ust->metadata_key, | |
6306 | usess->uid, usess->gid, | |
d2956687 JG |
6307 | usess->consumer, |
6308 | /* is_metadata_channel */ true); | |
5c408ad8 | 6309 | if (ret < 0) { |
6f6d3b69 | 6310 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
6311 | goto error; |
6312 | } | |
5c408ad8 JD |
6313 | } |
6314 | break; | |
6315 | } | |
6316 | case LTTNG_BUFFER_PER_PID: | |
6317 | { | |
6318 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6319 | struct consumer_socket *socket; | |
6320 | struct lttng_ht_iter chan_iter; | |
6321 | struct ust_app_channel *ua_chan; | |
6322 | struct ust_app_session *ua_sess; | |
6323 | struct ust_registry_session *registry; | |
6324 | ||
6325 | ua_sess = lookup_session_by_app(usess, app); | |
6326 | if (!ua_sess) { | |
6327 | /* Session not associated with this app. */ | |
6328 | continue; | |
6329 | } | |
5c408ad8 JD |
6330 | |
6331 | /* Get the right consumer socket for the application. */ | |
6332 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
6333 | usess->consumer); | |
6334 | if (!socket) { | |
6f6d3b69 | 6335 | cmd_ret = LTTNG_ERR_INVALID; |
5c408ad8 JD |
6336 | goto error; |
6337 | } | |
6338 | ||
6339 | registry = get_session_registry(ua_sess); | |
6340 | if (!registry) { | |
6f6d3b69 MD |
6341 | DBG("Application session is being torn down. Skip application."); |
6342 | continue; | |
5c408ad8 JD |
6343 | } |
6344 | ||
5c408ad8 JD |
6345 | /* Rotate the data channels. */ |
6346 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
6347 | ua_chan, node.node) { | |
470cc211 JG |
6348 | ret = consumer_rotate_channel(socket, |
6349 | ua_chan->key, | |
6350 | ua_sess->effective_credentials | |
6351 | .uid, | |
6352 | ua_sess->effective_credentials | |
6353 | .gid, | |
d2956687 JG |
6354 | ua_sess->consumer, |
6355 | /* is_metadata_channel */ false); | |
5c408ad8 | 6356 | if (ret < 0) { |
6f6d3b69 MD |
6357 | /* Per-PID buffer and application going away. */ |
6358 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) | |
6359 | continue; | |
6360 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; | |
5c408ad8 JD |
6361 | goto error; |
6362 | } | |
6363 | } | |
6364 | ||
6365 | /* Rotate the metadata channel. */ | |
6366 | (void) push_metadata(registry, usess->consumer); | |
470cc211 JG |
6367 | ret = consumer_rotate_channel(socket, |
6368 | registry->metadata_key, | |
6369 | ua_sess->effective_credentials.uid, | |
6370 | ua_sess->effective_credentials.gid, | |
d2956687 JG |
6371 | ua_sess->consumer, |
6372 | /* is_metadata_channel */ true); | |
5c408ad8 | 6373 | if (ret < 0) { |
6f6d3b69 MD |
6374 | /* Per-PID buffer and application going away. */ |
6375 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) | |
6376 | continue; | |
6377 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; | |
5c408ad8 JD |
6378 | goto error; |
6379 | } | |
5c408ad8 JD |
6380 | } |
6381 | break; | |
6382 | } | |
6383 | default: | |
6384 | assert(0); | |
6385 | break; | |
6386 | } | |
6387 | ||
6f6d3b69 | 6388 | cmd_ret = LTTNG_OK; |
5c408ad8 JD |
6389 | |
6390 | error: | |
6391 | rcu_read_unlock(); | |
6f6d3b69 | 6392 | return cmd_ret; |
5c408ad8 | 6393 | } |
d2956687 JG |
6394 | |
6395 | enum lttng_error_code ust_app_create_channel_subdirectories( | |
6396 | const struct ltt_ust_session *usess) | |
6397 | { | |
6398 | enum lttng_error_code ret = LTTNG_OK; | |
6399 | struct lttng_ht_iter iter; | |
6400 | enum lttng_trace_chunk_status chunk_status; | |
6401 | char *pathname_index; | |
6402 | int fmt_ret; | |
6403 | ||
6404 | assert(usess->current_trace_chunk); | |
6405 | rcu_read_lock(); | |
6406 | ||
6407 | switch (usess->buffer_type) { | |
6408 | case LTTNG_BUFFER_PER_UID: | |
6409 | { | |
6410 | struct buffer_reg_uid *reg; | |
6411 | ||
6412 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
6413 | fmt_ret = asprintf(&pathname_index, | |
5da88b0f | 6414 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH "/" DEFAULT_INDEX_DIR, |
d2956687 JG |
6415 | reg->uid, reg->bits_per_long); |
6416 | if (fmt_ret < 0) { | |
6417 | ERR("Failed to format channel index directory"); | |
6418 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
6419 | goto error; | |
6420 | } | |
6421 | ||
6422 | /* | |
6423 | * Create the index subdirectory which will take care | |
6424 | * of implicitly creating the channel's path. | |
6425 | */ | |
6426 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
6427 | usess->current_trace_chunk, | |
6428 | pathname_index); | |
6429 | free(pathname_index); | |
6430 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
6431 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
6432 | goto error; | |
6433 | } | |
6434 | } | |
6435 | break; | |
6436 | } | |
6437 | case LTTNG_BUFFER_PER_PID: | |
6438 | { | |
6439 | struct ust_app *app; | |
6440 | ||
495dece5 MD |
6441 | /* |
6442 | * Create the toplevel ust/ directory in case no apps are running. | |
6443 | */ | |
6444 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
6445 | usess->current_trace_chunk, | |
6446 | DEFAULT_UST_TRACE_DIR); | |
6447 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
6448 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
6449 | goto error; | |
6450 | } | |
6451 | ||
d2956687 JG |
6452 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, |
6453 | pid_n.node) { | |
6454 | struct ust_app_session *ua_sess; | |
6455 | struct ust_registry_session *registry; | |
6456 | ||
6457 | ua_sess = lookup_session_by_app(usess, app); | |
6458 | if (!ua_sess) { | |
6459 | /* Session not associated with this app. */ | |
6460 | continue; | |
6461 | } | |
6462 | ||
6463 | registry = get_session_registry(ua_sess); | |
6464 | if (!registry) { | |
6465 | DBG("Application session is being torn down. Skip application."); | |
6466 | continue; | |
6467 | } | |
6468 | ||
6469 | fmt_ret = asprintf(&pathname_index, | |
5da88b0f | 6470 | DEFAULT_UST_TRACE_DIR "/%s/" DEFAULT_INDEX_DIR, |
d2956687 JG |
6471 | ua_sess->path); |
6472 | if (fmt_ret < 0) { | |
6473 | ERR("Failed to format channel index directory"); | |
6474 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
6475 | goto error; | |
6476 | } | |
6477 | /* | |
6478 | * Create the index subdirectory which will take care | |
6479 | * of implicitly creating the channel's path. | |
6480 | */ | |
6481 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
6482 | usess->current_trace_chunk, | |
6483 | pathname_index); | |
6484 | free(pathname_index); | |
6485 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
6486 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
6487 | goto error; | |
6488 | } | |
6489 | } | |
6490 | break; | |
6491 | } | |
6492 | default: | |
6493 | abort(); | |
6494 | } | |
6495 | ||
6496 | ret = LTTNG_OK; | |
6497 | error: | |
6498 | rcu_read_unlock(); | |
6499 | return ret; | |
6500 | } | |
4a9b9759 MD |
6501 | |
6502 | /* | |
6503 | * Clear all the channels of a session. | |
6504 | * | |
6505 | * Return LTTNG_OK on success or else an LTTng error code. | |
6506 | */ | |
6507 | enum lttng_error_code ust_app_clear_session(struct ltt_session *session) | |
6508 | { | |
6509 | int ret; | |
6510 | enum lttng_error_code cmd_ret = LTTNG_OK; | |
6511 | struct lttng_ht_iter iter; | |
6512 | struct ust_app *app; | |
6513 | struct ltt_ust_session *usess = session->ust_session; | |
6514 | ||
6515 | assert(usess); | |
6516 | ||
6517 | rcu_read_lock(); | |
6518 | ||
6519 | if (usess->active) { | |
6520 | ERR("Expecting inactive session %s (%" PRIu64 ")", session->name, session->id); | |
6521 | cmd_ret = LTTNG_ERR_FATAL; | |
6522 | goto end; | |
6523 | } | |
6524 | ||
6525 | switch (usess->buffer_type) { | |
6526 | case LTTNG_BUFFER_PER_UID: | |
6527 | { | |
6528 | struct buffer_reg_uid *reg; | |
6529 | ||
6530 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
6531 | struct buffer_reg_channel *reg_chan; | |
6532 | struct consumer_socket *socket; | |
6533 | ||
6534 | /* Get consumer socket to use to push the metadata.*/ | |
6535 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
6536 | usess->consumer); | |
6537 | if (!socket) { | |
6538 | cmd_ret = LTTNG_ERR_INVALID; | |
6539 | goto error_socket; | |
6540 | } | |
6541 | ||
6542 | /* Clear the data channels. */ | |
6543 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
6544 | reg_chan, node.node) { | |
6545 | ret = consumer_clear_channel(socket, | |
6546 | reg_chan->consumer_key); | |
6547 | if (ret < 0) { | |
6548 | goto error; | |
6549 | } | |
6550 | } | |
6551 | ||
6552 | (void) push_metadata(reg->registry->reg.ust, usess->consumer); | |
6553 | ||
6554 | /* | |
6555 | * Clear the metadata channel. | |
6556 | * Metadata channel is not cleared per se but we still need to | |
6557 | * perform a rotation operation on it behind the scene. | |
6558 | */ | |
6559 | ret = consumer_clear_channel(socket, | |
6560 | reg->registry->reg.ust->metadata_key); | |
6561 | if (ret < 0) { | |
6562 | goto error; | |
6563 | } | |
6564 | } | |
6565 | break; | |
6566 | } | |
6567 | case LTTNG_BUFFER_PER_PID: | |
6568 | { | |
6569 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6570 | struct consumer_socket *socket; | |
6571 | struct lttng_ht_iter chan_iter; | |
6572 | struct ust_app_channel *ua_chan; | |
6573 | struct ust_app_session *ua_sess; | |
6574 | struct ust_registry_session *registry; | |
6575 | ||
6576 | ua_sess = lookup_session_by_app(usess, app); | |
6577 | if (!ua_sess) { | |
6578 | /* Session not associated with this app. */ | |
6579 | continue; | |
6580 | } | |
6581 | ||
6582 | /* Get the right consumer socket for the application. */ | |
6583 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
6584 | usess->consumer); | |
6585 | if (!socket) { | |
6586 | cmd_ret = LTTNG_ERR_INVALID; | |
6587 | goto error_socket; | |
6588 | } | |
6589 | ||
6590 | registry = get_session_registry(ua_sess); | |
6591 | if (!registry) { | |
6592 | DBG("Application session is being torn down. Skip application."); | |
6593 | continue; | |
6594 | } | |
6595 | ||
6596 | /* Clear the data channels. */ | |
6597 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
6598 | ua_chan, node.node) { | |
6599 | ret = consumer_clear_channel(socket, ua_chan->key); | |
6600 | if (ret < 0) { | |
6601 | /* Per-PID buffer and application going away. */ | |
6602 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) { | |
6603 | continue; | |
6604 | } | |
6605 | goto error; | |
6606 | } | |
6607 | } | |
6608 | ||
6609 | (void) push_metadata(registry, usess->consumer); | |
6610 | ||
6611 | /* | |
6612 | * Clear the metadata channel. | |
6613 | * Metadata channel is not cleared per se but we still need to | |
6614 | * perform rotation operation on it behind the scene. | |
6615 | */ | |
6616 | ret = consumer_clear_channel(socket, registry->metadata_key); | |
6617 | if (ret < 0) { | |
6618 | /* Per-PID buffer and application going away. */ | |
6619 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) { | |
6620 | continue; | |
6621 | } | |
6622 | goto error; | |
6623 | } | |
6624 | } | |
6625 | break; | |
6626 | } | |
6627 | default: | |
6628 | assert(0); | |
6629 | break; | |
6630 | } | |
6631 | ||
6632 | cmd_ret = LTTNG_OK; | |
6633 | goto end; | |
6634 | ||
6635 | error: | |
6636 | switch (-ret) { | |
6637 | case LTTCOMM_CONSUMERD_RELAYD_CLEAR_DISALLOWED: | |
6638 | cmd_ret = LTTNG_ERR_CLEAR_RELAY_DISALLOWED; | |
6639 | break; | |
6640 | default: | |
6641 | cmd_ret = LTTNG_ERR_CLEAR_FAIL_CONSUMER; | |
6642 | } | |
6643 | ||
6644 | error_socket: | |
6645 | end: | |
6646 | rcu_read_unlock(); | |
6647 | return cmd_ret; | |
6648 | } |