Commit | Line | Data |
---|---|---|
91d76f53 DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * | |
d14d33bf AM |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License, version 2 only, | |
6 | * as published by the Free Software Foundation. | |
91d76f53 DG |
7 | * |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
d14d33bf AM |
13 | * You should have received a copy of the GNU General Public License along |
14 | * with this program; if not, write to the Free Software Foundation, Inc., | |
15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
91d76f53 DG |
16 | */ |
17 | ||
18 | #define _GNU_SOURCE | |
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> |
fb54cdbf | 30 | #include <lttng/ust-error.h> |
331744e3 | 31 | #include <signal.h> |
bec39940 | 32 | |
990570ed | 33 | #include <common/common.h> |
86acf0da | 34 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 35 | |
7972aab2 | 36 | #include "buffer-registry.h" |
86acf0da | 37 | #include "fd-limit.h" |
8782cc74 | 38 | #include "health-sessiond.h" |
56fff090 | 39 | #include "ust-app.h" |
48842b30 | 40 | #include "ust-consumer.h" |
d80a6244 | 41 | #include "ust-ctl.h" |
0b2dc8df | 42 | #include "utils.h" |
d80a6244 | 43 | |
d9bf3ca4 MD |
44 | /* Next available channel key. Access under next_channel_key_lock. */ |
45 | static uint64_t _next_channel_key; | |
46 | static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER; | |
47 | ||
48 | /* Next available session ID. Access under next_session_id_lock. */ | |
49 | static uint64_t _next_session_id; | |
50 | static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER; | |
ffe60014 DG |
51 | |
52 | /* | |
d9bf3ca4 | 53 | * Return the incremented value of next_channel_key. |
ffe60014 | 54 | */ |
d9bf3ca4 | 55 | static uint64_t get_next_channel_key(void) |
ffe60014 | 56 | { |
d9bf3ca4 MD |
57 | uint64_t ret; |
58 | ||
59 | pthread_mutex_lock(&next_channel_key_lock); | |
60 | ret = ++_next_channel_key; | |
61 | pthread_mutex_unlock(&next_channel_key_lock); | |
62 | return ret; | |
ffe60014 DG |
63 | } |
64 | ||
65 | /* | |
7972aab2 | 66 | * Return the atomically incremented value of next_session_id. |
ffe60014 | 67 | */ |
d9bf3ca4 | 68 | static uint64_t get_next_session_id(void) |
ffe60014 | 69 | { |
d9bf3ca4 MD |
70 | uint64_t ret; |
71 | ||
72 | pthread_mutex_lock(&next_session_id_lock); | |
73 | ret = ++_next_session_id; | |
74 | pthread_mutex_unlock(&next_session_id_lock); | |
75 | return ret; | |
ffe60014 DG |
76 | } |
77 | ||
d65d2de8 DG |
78 | static void copy_channel_attr_to_ustctl( |
79 | struct ustctl_consumer_channel_attr *attr, | |
80 | struct lttng_ust_channel_attr *uattr) | |
81 | { | |
82 | /* Copy event attributes since the layout is different. */ | |
83 | attr->subbuf_size = uattr->subbuf_size; | |
84 | attr->num_subbuf = uattr->num_subbuf; | |
85 | attr->overwrite = uattr->overwrite; | |
86 | attr->switch_timer_interval = uattr->switch_timer_interval; | |
87 | attr->read_timer_interval = uattr->read_timer_interval; | |
88 | attr->output = uattr->output; | |
89 | } | |
90 | ||
025faf73 DG |
91 | /* |
92 | * Match function for the hash table lookup. | |
93 | * | |
94 | * It matches an ust app event based on three attributes which are the event | |
95 | * name, the filter bytecode and the loglevel. | |
96 | */ | |
18eace3b DG |
97 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
98 | { | |
99 | struct ust_app_event *event; | |
100 | const struct ust_app_ht_key *key; | |
101 | ||
102 | assert(node); | |
103 | assert(_key); | |
104 | ||
105 | event = caa_container_of(node, struct ust_app_event, node.node); | |
106 | key = _key; | |
107 | ||
1af53eb5 | 108 | /* Match the 4 elements of the key: name, filter, loglevel, exclusions */ |
18eace3b DG |
109 | |
110 | /* Event name */ | |
111 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
112 | goto no_match; | |
113 | } | |
114 | ||
115 | /* Event loglevel. */ | |
116 | if (event->attr.loglevel != key->loglevel) { | |
025faf73 DG |
117 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
118 | && key->loglevel == 0 && event->attr.loglevel == -1) { | |
119 | /* | |
120 | * Match is accepted. This is because on event creation, the | |
121 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
122 | * -1 are accepted for this loglevel type since 0 is the one set by | |
123 | * the API when receiving an enable event. | |
124 | */ | |
125 | } else { | |
126 | goto no_match; | |
127 | } | |
18eace3b DG |
128 | } |
129 | ||
130 | /* One of the filters is NULL, fail. */ | |
131 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
132 | goto no_match; | |
133 | } | |
134 | ||
025faf73 DG |
135 | if (key->filter && event->filter) { |
136 | /* Both filters exists, check length followed by the bytecode. */ | |
137 | if (event->filter->len != key->filter->len || | |
138 | memcmp(event->filter->data, key->filter->data, | |
139 | event->filter->len) != 0) { | |
140 | goto no_match; | |
141 | } | |
18eace3b DG |
142 | } |
143 | ||
1af53eb5 JI |
144 | /* One of the exclusions is NULL, fail. */ |
145 | if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) { | |
146 | goto no_match; | |
147 | } | |
148 | ||
149 | if (key->exclusion && event->exclusion) { | |
150 | /* Both exclusions exists, check count followed by the names. */ | |
151 | if (event->exclusion->count != key->exclusion->count || | |
152 | memcmp(event->exclusion->names, key->exclusion->names, | |
153 | event->exclusion->count * LTTNG_UST_SYM_NAME_LEN) != 0) { | |
154 | goto no_match; | |
155 | } | |
156 | } | |
157 | ||
158 | ||
025faf73 | 159 | /* Match. */ |
18eace3b DG |
160 | return 1; |
161 | ||
162 | no_match: | |
163 | return 0; | |
18eace3b DG |
164 | } |
165 | ||
025faf73 DG |
166 | /* |
167 | * Unique add of an ust app event in the given ht. This uses the custom | |
168 | * ht_match_ust_app_event match function and the event name as hash. | |
169 | */ | |
d0b96690 | 170 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
171 | struct ust_app_event *event) |
172 | { | |
173 | struct cds_lfht_node *node_ptr; | |
174 | struct ust_app_ht_key key; | |
d0b96690 | 175 | struct lttng_ht *ht; |
18eace3b | 176 | |
d0b96690 DG |
177 | assert(ua_chan); |
178 | assert(ua_chan->events); | |
18eace3b DG |
179 | assert(event); |
180 | ||
d0b96690 | 181 | ht = ua_chan->events; |
18eace3b DG |
182 | key.name = event->attr.name; |
183 | key.filter = event->filter; | |
184 | key.loglevel = event->attr.loglevel; | |
91c89f23 | 185 | key.exclusion = event->exclusion; |
18eace3b DG |
186 | |
187 | node_ptr = cds_lfht_add_unique(ht->ht, | |
188 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
189 | ht_match_ust_app_event, &key, &event->node.node); | |
190 | assert(node_ptr == &event->node.node); | |
191 | } | |
192 | ||
d88aee68 DG |
193 | /* |
194 | * Close the notify socket from the given RCU head object. This MUST be called | |
195 | * through a call_rcu(). | |
196 | */ | |
197 | static void close_notify_sock_rcu(struct rcu_head *head) | |
198 | { | |
199 | int ret; | |
200 | struct ust_app_notify_sock_obj *obj = | |
201 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
202 | ||
203 | /* Must have a valid fd here. */ | |
204 | assert(obj->fd >= 0); | |
205 | ||
206 | ret = close(obj->fd); | |
207 | if (ret) { | |
208 | ERR("close notify sock %d RCU", obj->fd); | |
209 | } | |
210 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
211 | ||
212 | free(obj); | |
213 | } | |
214 | ||
7972aab2 DG |
215 | /* |
216 | * Return the session registry according to the buffer type of the given | |
217 | * session. | |
218 | * | |
219 | * A registry per UID object MUST exists before calling this function or else | |
220 | * it assert() if not found. RCU read side lock must be acquired. | |
221 | */ | |
222 | static struct ust_registry_session *get_session_registry( | |
223 | struct ust_app_session *ua_sess) | |
224 | { | |
225 | struct ust_registry_session *registry = NULL; | |
226 | ||
227 | assert(ua_sess); | |
228 | ||
229 | switch (ua_sess->buffer_type) { | |
230 | case LTTNG_BUFFER_PER_PID: | |
231 | { | |
232 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
233 | if (!reg_pid) { | |
234 | goto error; | |
235 | } | |
236 | registry = reg_pid->registry->reg.ust; | |
237 | break; | |
238 | } | |
239 | case LTTNG_BUFFER_PER_UID: | |
240 | { | |
241 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
242 | ua_sess->tracing_id, ua_sess->bits_per_long, ua_sess->uid); | |
243 | if (!reg_uid) { | |
244 | goto error; | |
245 | } | |
246 | registry = reg_uid->registry->reg.ust; | |
247 | break; | |
248 | } | |
249 | default: | |
250 | assert(0); | |
251 | }; | |
252 | ||
253 | error: | |
254 | return registry; | |
255 | } | |
256 | ||
55cc08a6 DG |
257 | /* |
258 | * Delete ust context safely. RCU read lock must be held before calling | |
259 | * this function. | |
260 | */ | |
261 | static | |
262 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx) | |
263 | { | |
ffe60014 DG |
264 | int ret; |
265 | ||
266 | assert(ua_ctx); | |
267 | ||
55cc08a6 | 268 | if (ua_ctx->obj) { |
ffe60014 | 269 | ret = ustctl_release_object(sock, ua_ctx->obj); |
d0b96690 DG |
270 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
271 | ERR("UST app sock %d release ctx obj handle %d failed with ret %d", | |
272 | sock, ua_ctx->obj->handle, ret); | |
ffe60014 | 273 | } |
55cc08a6 DG |
274 | free(ua_ctx->obj); |
275 | } | |
276 | free(ua_ctx); | |
277 | } | |
278 | ||
d80a6244 DG |
279 | /* |
280 | * Delete ust app event safely. RCU read lock must be held before calling | |
281 | * this function. | |
282 | */ | |
8b366481 DG |
283 | static |
284 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event) | |
d80a6244 | 285 | { |
ffe60014 DG |
286 | int ret; |
287 | ||
288 | assert(ua_event); | |
289 | ||
53a80697 | 290 | free(ua_event->filter); |
951f0b71 JI |
291 | if (ua_event->exclusion != NULL) |
292 | free(ua_event->exclusion); | |
edb67388 | 293 | if (ua_event->obj != NULL) { |
ffe60014 DG |
294 | ret = ustctl_release_object(sock, ua_event->obj); |
295 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
296 | ERR("UST app sock %d release event obj failed with ret %d", | |
297 | sock, ret); | |
298 | } | |
edb67388 DG |
299 | free(ua_event->obj); |
300 | } | |
d80a6244 DG |
301 | free(ua_event); |
302 | } | |
303 | ||
304 | /* | |
7972aab2 DG |
305 | * Release ust data object of the given stream. |
306 | * | |
307 | * Return 0 on success or else a negative value. | |
d80a6244 | 308 | */ |
7972aab2 | 309 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream) |
d80a6244 | 310 | { |
7972aab2 | 311 | int ret = 0; |
ffe60014 DG |
312 | |
313 | assert(stream); | |
314 | ||
8b366481 | 315 | if (stream->obj) { |
ffe60014 DG |
316 | ret = ustctl_release_object(sock, stream->obj); |
317 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
318 | ERR("UST app sock %d release stream obj failed with ret %d", | |
319 | sock, ret); | |
320 | } | |
4063050c | 321 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
322 | free(stream->obj); |
323 | } | |
7972aab2 DG |
324 | |
325 | return ret; | |
326 | } | |
327 | ||
328 | /* | |
329 | * Delete ust app stream safely. RCU read lock must be held before calling | |
330 | * this function. | |
331 | */ | |
332 | static | |
333 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream) | |
334 | { | |
335 | assert(stream); | |
336 | ||
337 | (void) release_ust_app_stream(sock, stream); | |
84cd17c6 | 338 | free(stream); |
d80a6244 DG |
339 | } |
340 | ||
36b588ed MD |
341 | /* |
342 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
343 | * section and outside of call_rcu thread, so we postpone its execution |
344 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
345 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
346 | */ |
347 | static | |
348 | void delete_ust_app_channel_rcu(struct rcu_head *head) | |
349 | { | |
350 | struct ust_app_channel *ua_chan = | |
351 | caa_container_of(head, struct ust_app_channel, rcu_head); | |
352 | ||
0b2dc8df MD |
353 | ht_cleanup_push(ua_chan->ctx); |
354 | ht_cleanup_push(ua_chan->events); | |
36b588ed MD |
355 | free(ua_chan); |
356 | } | |
357 | ||
d80a6244 DG |
358 | /* |
359 | * Delete ust app channel safely. RCU read lock must be held before calling | |
360 | * this function. | |
361 | */ | |
8b366481 | 362 | static |
d0b96690 DG |
363 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
364 | struct ust_app *app) | |
d80a6244 DG |
365 | { |
366 | int ret; | |
bec39940 | 367 | struct lttng_ht_iter iter; |
d80a6244 | 368 | struct ust_app_event *ua_event; |
55cc08a6 | 369 | struct ust_app_ctx *ua_ctx; |
030a66fa | 370 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 371 | struct ust_registry_session *registry; |
d80a6244 | 372 | |
ffe60014 DG |
373 | assert(ua_chan); |
374 | ||
375 | DBG3("UST app deleting channel %s", ua_chan->name); | |
376 | ||
55cc08a6 | 377 | /* Wipe stream */ |
d80a6244 | 378 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 379 | cds_list_del(&stream->list); |
d80a6244 DG |
380 | delete_ust_app_stream(sock, stream); |
381 | } | |
382 | ||
55cc08a6 | 383 | /* Wipe context */ |
bec39940 | 384 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
31746f93 | 385 | cds_list_del(&ua_ctx->list); |
bec39940 | 386 | ret = lttng_ht_del(ua_chan->ctx, &iter); |
55cc08a6 DG |
387 | assert(!ret); |
388 | delete_ust_app_ctx(sock, ua_ctx); | |
389 | } | |
d80a6244 | 390 | |
55cc08a6 | 391 | /* Wipe events */ |
bec39940 DG |
392 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
393 | node.node) { | |
394 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 395 | assert(!ret); |
d80a6244 DG |
396 | delete_ust_app_event(sock, ua_event); |
397 | } | |
edb67388 | 398 | |
c8335706 MD |
399 | if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) { |
400 | /* Wipe and free registry from session registry. */ | |
401 | registry = get_session_registry(ua_chan->session); | |
402 | if (registry) { | |
403 | ust_registry_channel_del_free(registry, ua_chan->key); | |
404 | } | |
7972aab2 | 405 | } |
d0b96690 | 406 | |
edb67388 | 407 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
408 | /* Remove channel from application UST object descriptor. */ |
409 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
c6e62271 DG |
410 | ret = lttng_ht_del(app->ust_objd, &iter); |
411 | assert(!ret); | |
ffe60014 DG |
412 | ret = ustctl_release_object(sock, ua_chan->obj); |
413 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
414 | ERR("UST app sock %d release channel obj failed with ret %d", | |
415 | sock, ret); | |
416 | } | |
7972aab2 | 417 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
418 | free(ua_chan->obj); |
419 | } | |
36b588ed | 420 | call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); |
d80a6244 DG |
421 | } |
422 | ||
331744e3 | 423 | /* |
1b532a60 DG |
424 | * Push metadata to consumer socket. |
425 | * | |
426 | * The socket lock MUST be acquired. | |
427 | * The ust app session lock MUST be acquired. | |
331744e3 JD |
428 | * |
429 | * On success, return the len of metadata pushed or else a negative value. | |
430 | */ | |
431 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
432 | struct consumer_socket *socket, int send_zero_data) | |
433 | { | |
434 | int ret; | |
435 | char *metadata_str = NULL; | |
436 | size_t len, offset; | |
437 | ssize_t ret_val; | |
438 | ||
439 | assert(registry); | |
440 | assert(socket); | |
1b532a60 DG |
441 | |
442 | /* | |
443 | * On a push metadata error either the consumer is dead or the metadata | |
444 | * channel has been destroyed because its endpoint might have died (e.g: | |
445 | * relayd). If so, the metadata closed flag is set to 1 so we deny pushing | |
446 | * metadata again which is not valid anymore on the consumer side. | |
447 | * | |
448 | * The ust app session mutex locked allows us to make this check without | |
449 | * the registry lock. | |
450 | */ | |
451 | if (registry->metadata_closed) { | |
452 | return -EPIPE; | |
453 | } | |
331744e3 JD |
454 | |
455 | pthread_mutex_lock(®istry->lock); | |
456 | ||
457 | offset = registry->metadata_len_sent; | |
458 | len = registry->metadata_len - registry->metadata_len_sent; | |
459 | if (len == 0) { | |
460 | DBG3("No metadata to push for metadata key %" PRIu64, | |
461 | registry->metadata_key); | |
462 | ret_val = len; | |
463 | if (send_zero_data) { | |
464 | DBG("No metadata to push"); | |
465 | goto push_data; | |
466 | } | |
467 | goto end; | |
468 | } | |
469 | ||
470 | /* Allocate only what we have to send. */ | |
471 | metadata_str = zmalloc(len); | |
472 | if (!metadata_str) { | |
473 | PERROR("zmalloc ust app metadata string"); | |
474 | ret_val = -ENOMEM; | |
475 | goto error; | |
476 | } | |
477 | /* Copy what we haven't send out. */ | |
478 | memcpy(metadata_str, registry->metadata + offset, len); | |
479 | registry->metadata_len_sent += len; | |
480 | ||
481 | push_data: | |
482 | pthread_mutex_unlock(®istry->lock); | |
483 | ret = consumer_push_metadata(socket, registry->metadata_key, | |
484 | metadata_str, len, offset); | |
485 | if (ret < 0) { | |
000baf6a DG |
486 | /* |
487 | * There is an acceptable race here between the registry metadata key | |
488 | * assignment and the creation on the consumer. The session daemon can | |
489 | * concurrently push metadata for this registry while being created on | |
490 | * the consumer since the metadata key of the registry is assigned | |
491 | * *before* it is setup to avoid the consumer to ask for metadata that | |
492 | * could possibly be not found in the session daemon. | |
493 | * | |
494 | * The metadata will get pushed either by the session being stopped or | |
495 | * the consumer requesting metadata if that race is triggered. | |
496 | */ | |
497 | if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) { | |
498 | ret = 0; | |
499 | } | |
ffa3f245 DG |
500 | |
501 | /* Update back the actual metadata len sent since it failed here. */ | |
502 | pthread_mutex_lock(®istry->lock); | |
503 | registry->metadata_len_sent -= len; | |
504 | pthread_mutex_unlock(®istry->lock); | |
331744e3 JD |
505 | ret_val = ret; |
506 | goto error_push; | |
507 | } | |
508 | ||
509 | free(metadata_str); | |
510 | return len; | |
511 | ||
512 | end: | |
513 | error: | |
514 | pthread_mutex_unlock(®istry->lock); | |
515 | error_push: | |
516 | free(metadata_str); | |
517 | return ret_val; | |
518 | } | |
519 | ||
d88aee68 DG |
520 | /* |
521 | * For a given application and session, push metadata to consumer. The session | |
522 | * lock MUST be acquired here before calling this. | |
331744e3 JD |
523 | * Either sock or consumer is required : if sock is NULL, the default |
524 | * socket to send the metadata is retrieved from consumer, if sock | |
525 | * is not NULL we use it to send the metadata. | |
d88aee68 DG |
526 | * |
527 | * Return 0 on success else a negative error. | |
528 | */ | |
7972aab2 DG |
529 | static int push_metadata(struct ust_registry_session *registry, |
530 | struct consumer_output *consumer) | |
d88aee68 | 531 | { |
331744e3 JD |
532 | int ret_val; |
533 | ssize_t ret; | |
d88aee68 DG |
534 | struct consumer_socket *socket; |
535 | ||
7972aab2 DG |
536 | assert(registry); |
537 | assert(consumer); | |
538 | ||
539 | rcu_read_lock(); | |
d88aee68 | 540 | |
7972aab2 DG |
541 | /* |
542 | * Means that no metadata was assigned to the session. This can happens if | |
543 | * no start has been done previously. | |
544 | */ | |
545 | if (!registry->metadata_key) { | |
331744e3 | 546 | ret_val = 0; |
1b532a60 | 547 | goto end_rcu_unlock; |
d88aee68 DG |
548 | } |
549 | ||
d88aee68 | 550 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
551 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
552 | consumer); | |
d88aee68 | 553 | if (!socket) { |
331744e3 | 554 | ret_val = -1; |
d88aee68 DG |
555 | goto error_rcu_unlock; |
556 | } | |
557 | ||
558 | /* | |
559 | * TODO: Currently, we hold the socket lock around sampling of the next | |
560 | * metadata segment to ensure we send metadata over the consumer socket in | |
561 | * the correct order. This makes the registry lock nest inside the socket | |
562 | * lock. | |
563 | * | |
564 | * Please note that this is a temporary measure: we should move this lock | |
565 | * back into ust_consumer_push_metadata() when the consumer gets the | |
566 | * ability to reorder the metadata it receives. | |
567 | */ | |
568 | pthread_mutex_lock(socket->lock); | |
331744e3 JD |
569 | ret = ust_app_push_metadata(registry, socket, 0); |
570 | pthread_mutex_unlock(socket->lock); | |
d88aee68 | 571 | if (ret < 0) { |
331744e3 | 572 | ret_val = ret; |
d88aee68 DG |
573 | goto error_rcu_unlock; |
574 | } | |
575 | ||
d88aee68 | 576 | rcu_read_unlock(); |
d88aee68 DG |
577 | return 0; |
578 | ||
d88aee68 | 579 | error_rcu_unlock: |
1b532a60 DG |
580 | /* |
581 | * On error, flag the registry that the metadata is closed. We were unable | |
582 | * to push anything and this means that either the consumer is not | |
583 | * responding or the metadata cache has been destroyed on the consumer. | |
584 | */ | |
585 | registry->metadata_closed = 1; | |
586 | end_rcu_unlock: | |
d88aee68 | 587 | rcu_read_unlock(); |
331744e3 | 588 | return ret_val; |
d88aee68 DG |
589 | } |
590 | ||
591 | /* | |
592 | * Send to the consumer a close metadata command for the given session. Once | |
593 | * done, the metadata channel is deleted and the session metadata pointer is | |
594 | * nullified. The session lock MUST be acquired here unless the application is | |
595 | * in the destroy path. | |
596 | * | |
597 | * Return 0 on success else a negative value. | |
598 | */ | |
7972aab2 DG |
599 | static int close_metadata(struct ust_registry_session *registry, |
600 | struct consumer_output *consumer) | |
d88aee68 DG |
601 | { |
602 | int ret; | |
603 | struct consumer_socket *socket; | |
604 | ||
7972aab2 DG |
605 | assert(registry); |
606 | assert(consumer); | |
d88aee68 | 607 | |
7972aab2 DG |
608 | rcu_read_lock(); |
609 | ||
610 | if (!registry->metadata_key || registry->metadata_closed) { | |
d88aee68 | 611 | ret = 0; |
1b532a60 | 612 | goto end; |
d88aee68 DG |
613 | } |
614 | ||
d88aee68 | 615 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
616 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
617 | consumer); | |
d88aee68 DG |
618 | if (!socket) { |
619 | ret = -1; | |
7972aab2 | 620 | goto error; |
d88aee68 DG |
621 | } |
622 | ||
7972aab2 | 623 | ret = consumer_close_metadata(socket, registry->metadata_key); |
d88aee68 | 624 | if (ret < 0) { |
7972aab2 | 625 | goto error; |
d88aee68 DG |
626 | } |
627 | ||
d88aee68 | 628 | error: |
1b532a60 DG |
629 | /* |
630 | * Metadata closed. Even on error this means that the consumer is not | |
631 | * responding or not found so either way a second close should NOT be emit | |
632 | * for this registry. | |
633 | */ | |
634 | registry->metadata_closed = 1; | |
635 | end: | |
7972aab2 | 636 | rcu_read_unlock(); |
d88aee68 DG |
637 | return ret; |
638 | } | |
639 | ||
36b588ed MD |
640 | /* |
641 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
642 | * section and outside of call_rcu thread, so we postpone its execution |
643 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
644 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
645 | */ |
646 | static | |
647 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
648 | { | |
649 | struct ust_app_session *ua_sess = | |
650 | caa_container_of(head, struct ust_app_session, rcu_head); | |
651 | ||
0b2dc8df | 652 | ht_cleanup_push(ua_sess->channels); |
36b588ed MD |
653 | free(ua_sess); |
654 | } | |
655 | ||
d80a6244 DG |
656 | /* |
657 | * Delete ust app session safely. RCU read lock must be held before calling | |
658 | * this function. | |
659 | */ | |
8b366481 | 660 | static |
d0b96690 DG |
661 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
662 | struct ust_app *app) | |
d80a6244 DG |
663 | { |
664 | int ret; | |
bec39940 | 665 | struct lttng_ht_iter iter; |
d80a6244 | 666 | struct ust_app_channel *ua_chan; |
7972aab2 | 667 | struct ust_registry_session *registry; |
d80a6244 | 668 | |
d88aee68 DG |
669 | assert(ua_sess); |
670 | ||
1b532a60 DG |
671 | pthread_mutex_lock(&ua_sess->lock); |
672 | ||
7972aab2 | 673 | registry = get_session_registry(ua_sess); |
1b532a60 | 674 | if (registry && !registry->metadata_closed) { |
d88aee68 | 675 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 676 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 677 | |
7972aab2 DG |
678 | /* |
679 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
680 | * metadata only on destroy trace session in this case. Also, the |
681 | * previous push metadata could have flag the metadata registry to | |
682 | * close so don't send a close command if closed. | |
7972aab2 | 683 | */ |
1b532a60 DG |
684 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID && |
685 | !registry->metadata_closed) { | |
7972aab2 DG |
686 | /* And ask to close it for this session registry. */ |
687 | (void) close_metadata(registry, ua_sess->consumer); | |
688 | } | |
d80a6244 DG |
689 | } |
690 | ||
bec39940 DG |
691 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
692 | node.node) { | |
693 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 694 | assert(!ret); |
d0b96690 | 695 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 696 | } |
d80a6244 | 697 | |
7972aab2 DG |
698 | /* In case of per PID, the registry is kept in the session. */ |
699 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
700 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
701 | if (reg_pid) { | |
702 | buffer_reg_pid_remove(reg_pid); | |
703 | buffer_reg_pid_destroy(reg_pid); | |
704 | } | |
705 | } | |
d0b96690 | 706 | |
aee6bafd | 707 | if (ua_sess->handle != -1) { |
ffe60014 DG |
708 | ret = ustctl_release_handle(sock, ua_sess->handle); |
709 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
710 | ERR("UST app sock %d release session handle failed with ret %d", | |
711 | sock, ret); | |
712 | } | |
aee6bafd | 713 | } |
1b532a60 DG |
714 | pthread_mutex_unlock(&ua_sess->lock); |
715 | ||
36b588ed | 716 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 717 | } |
91d76f53 DG |
718 | |
719 | /* | |
284d8f55 DG |
720 | * Delete a traceable application structure from the global list. Never call |
721 | * this function outside of a call_rcu call. | |
36b588ed MD |
722 | * |
723 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 724 | */ |
8b366481 DG |
725 | static |
726 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 727 | { |
8b366481 | 728 | int ret, sock; |
d42f20df | 729 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 730 | |
d80a6244 | 731 | /* Delete ust app sessions info */ |
852d0037 DG |
732 | sock = app->sock; |
733 | app->sock = -1; | |
d80a6244 | 734 | |
8b366481 | 735 | /* Wipe sessions */ |
d42f20df DG |
736 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
737 | teardown_node) { | |
738 | /* Free every object in the session and the session. */ | |
36b588ed | 739 | rcu_read_lock(); |
d0b96690 | 740 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 741 | rcu_read_unlock(); |
d80a6244 | 742 | } |
36b588ed | 743 | |
0b2dc8df MD |
744 | ht_cleanup_push(app->sessions); |
745 | ht_cleanup_push(app->ust_objd); | |
d80a6244 | 746 | |
6414a713 | 747 | /* |
852d0037 DG |
748 | * Wait until we have deleted the application from the sock hash table |
749 | * before closing this socket, otherwise an application could re-use the | |
750 | * socket ID and race with the teardown, using the same hash table entry. | |
751 | * | |
752 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
753 | * all RCU readers that could run concurrently with unregister app, | |
754 | * therefore we _need_ to only close that socket after a grace period. So | |
755 | * it should stay in this RCU callback. | |
756 | * | |
757 | * This close() is a very important step of the synchronization model so | |
758 | * every modification to this function must be carefully reviewed. | |
6414a713 | 759 | */ |
799e2c4f MD |
760 | ret = close(sock); |
761 | if (ret) { | |
762 | PERROR("close"); | |
763 | } | |
4063050c | 764 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 765 | |
852d0037 | 766 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 767 | free(app); |
099e26bd DG |
768 | } |
769 | ||
770 | /* | |
f6a9efaa | 771 | * URCU intermediate call to delete an UST app. |
099e26bd | 772 | */ |
8b366481 DG |
773 | static |
774 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 775 | { |
bec39940 DG |
776 | struct lttng_ht_node_ulong *node = |
777 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 778 | struct ust_app *app = |
852d0037 | 779 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 780 | |
852d0037 | 781 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 782 | delete_ust_app(app); |
099e26bd DG |
783 | } |
784 | ||
ffe60014 DG |
785 | /* |
786 | * Delete the session from the application ht and delete the data structure by | |
787 | * freeing every object inside and releasing them. | |
788 | */ | |
d0b96690 | 789 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
790 | struct ust_app_session *ua_sess) |
791 | { | |
792 | int ret; | |
793 | struct lttng_ht_iter iter; | |
794 | ||
795 | assert(app); | |
796 | assert(ua_sess); | |
797 | ||
798 | iter.iter.node = &ua_sess->node.node; | |
799 | ret = lttng_ht_del(app->sessions, &iter); | |
800 | if (ret) { | |
801 | /* Already scheduled for teardown. */ | |
802 | goto end; | |
803 | } | |
804 | ||
805 | /* Once deleted, free the data structure. */ | |
d0b96690 | 806 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
807 | |
808 | end: | |
809 | return; | |
810 | } | |
811 | ||
8b366481 DG |
812 | /* |
813 | * Alloc new UST app session. | |
814 | */ | |
815 | static | |
d0b96690 | 816 | struct ust_app_session *alloc_ust_app_session(struct ust_app *app) |
8b366481 DG |
817 | { |
818 | struct ust_app_session *ua_sess; | |
819 | ||
820 | /* Init most of the default value by allocating and zeroing */ | |
821 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
822 | if (ua_sess == NULL) { | |
823 | PERROR("malloc"); | |
ffe60014 | 824 | goto error_free; |
8b366481 DG |
825 | } |
826 | ||
827 | ua_sess->handle = -1; | |
bec39940 | 828 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
ad7a9107 | 829 | ua_sess->metadata_attr.type = LTTNG_UST_CHAN_METADATA; |
84ad93e8 | 830 | pthread_mutex_init(&ua_sess->lock, NULL); |
ad7a9107 | 831 | |
8b366481 DG |
832 | return ua_sess; |
833 | ||
ffe60014 | 834 | error_free: |
8b366481 DG |
835 | return NULL; |
836 | } | |
837 | ||
838 | /* | |
839 | * Alloc new UST app channel. | |
840 | */ | |
841 | static | |
842 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 843 | struct ust_app_session *ua_sess, |
ffe60014 | 844 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
845 | { |
846 | struct ust_app_channel *ua_chan; | |
847 | ||
848 | /* Init most of the default value by allocating and zeroing */ | |
849 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
850 | if (ua_chan == NULL) { | |
851 | PERROR("malloc"); | |
852 | goto error; | |
853 | } | |
854 | ||
855 | /* Setup channel name */ | |
856 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
857 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
858 | ||
859 | ua_chan->enabled = 1; | |
860 | ua_chan->handle = -1; | |
45893984 | 861 | ua_chan->session = ua_sess; |
ffe60014 | 862 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
863 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
864 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
865 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
866 | |
867 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
31746f93 | 868 | CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); |
8b366481 DG |
869 | |
870 | /* Copy attributes */ | |
871 | if (attr) { | |
ffe60014 | 872 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
873 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
874 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
875 | ua_chan->attr.overwrite = attr->overwrite; | |
876 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
877 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
878 | ua_chan->attr.output = attr->output; | |
8b366481 | 879 | } |
ffe60014 DG |
880 | /* By default, the channel is a per cpu channel. */ |
881 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
882 | |
883 | DBG3("UST app channel %s allocated", ua_chan->name); | |
884 | ||
885 | return ua_chan; | |
886 | ||
887 | error: | |
888 | return NULL; | |
889 | } | |
890 | ||
37f1c236 DG |
891 | /* |
892 | * Allocate and initialize a UST app stream. | |
893 | * | |
894 | * Return newly allocated stream pointer or NULL on error. | |
895 | */ | |
ffe60014 | 896 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
897 | { |
898 | struct ust_app_stream *stream = NULL; | |
899 | ||
900 | stream = zmalloc(sizeof(*stream)); | |
901 | if (stream == NULL) { | |
902 | PERROR("zmalloc ust app stream"); | |
903 | goto error; | |
904 | } | |
905 | ||
906 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
907 | stream->handle = -1; | |
908 | ||
909 | error: | |
910 | return stream; | |
911 | } | |
912 | ||
8b366481 DG |
913 | /* |
914 | * Alloc new UST app event. | |
915 | */ | |
916 | static | |
917 | struct ust_app_event *alloc_ust_app_event(char *name, | |
918 | struct lttng_ust_event *attr) | |
919 | { | |
920 | struct ust_app_event *ua_event; | |
921 | ||
922 | /* Init most of the default value by allocating and zeroing */ | |
923 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
924 | if (ua_event == NULL) { | |
925 | PERROR("malloc"); | |
926 | goto error; | |
927 | } | |
928 | ||
929 | ua_event->enabled = 1; | |
930 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
931 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 932 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
933 | |
934 | /* Copy attributes */ | |
935 | if (attr) { | |
936 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
937 | } | |
938 | ||
939 | DBG3("UST app event %s allocated", ua_event->name); | |
940 | ||
941 | return ua_event; | |
942 | ||
943 | error: | |
944 | return NULL; | |
945 | } | |
946 | ||
947 | /* | |
948 | * Alloc new UST app context. | |
949 | */ | |
950 | static | |
951 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx) | |
952 | { | |
953 | struct ust_app_ctx *ua_ctx; | |
954 | ||
955 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
956 | if (ua_ctx == NULL) { | |
957 | goto error; | |
958 | } | |
959 | ||
31746f93 DG |
960 | CDS_INIT_LIST_HEAD(&ua_ctx->list); |
961 | ||
8b366481 DG |
962 | if (uctx) { |
963 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
964 | } | |
965 | ||
966 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
967 | ||
968 | error: | |
969 | return ua_ctx; | |
970 | } | |
971 | ||
025faf73 DG |
972 | /* |
973 | * Allocate a filter and copy the given original filter. | |
974 | * | |
975 | * Return allocated filter or NULL on error. | |
976 | */ | |
977 | static struct lttng_ust_filter_bytecode *alloc_copy_ust_app_filter( | |
978 | struct lttng_ust_filter_bytecode *orig_f) | |
979 | { | |
980 | struct lttng_ust_filter_bytecode *filter = NULL; | |
981 | ||
982 | /* Copy filter bytecode */ | |
983 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
984 | if (!filter) { | |
985 | PERROR("zmalloc alloc ust app filter"); | |
986 | goto error; | |
987 | } | |
988 | ||
989 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
990 | ||
991 | error: | |
992 | return filter; | |
993 | } | |
994 | ||
099e26bd | 995 | /* |
421cb601 DG |
996 | * Find an ust_app using the sock and return it. RCU read side lock must be |
997 | * held before calling this helper function. | |
099e26bd | 998 | */ |
f20baf8e | 999 | struct ust_app *ust_app_find_by_sock(int sock) |
099e26bd | 1000 | { |
bec39940 | 1001 | struct lttng_ht_node_ulong *node; |
bec39940 | 1002 | struct lttng_ht_iter iter; |
f6a9efaa | 1003 | |
852d0037 | 1004 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 1005 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
1006 | if (node == NULL) { |
1007 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
1008 | goto error; |
1009 | } | |
852d0037 DG |
1010 | |
1011 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
1012 | |
1013 | error: | |
1014 | return NULL; | |
099e26bd DG |
1015 | } |
1016 | ||
d0b96690 DG |
1017 | /* |
1018 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
1019 | * be held before calling this helper function. | |
1020 | */ | |
1021 | static struct ust_app *find_app_by_notify_sock(int sock) | |
1022 | { | |
1023 | struct lttng_ht_node_ulong *node; | |
1024 | struct lttng_ht_iter iter; | |
1025 | ||
1026 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
1027 | &iter); | |
1028 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1029 | if (node == NULL) { | |
1030 | DBG2("UST app find by notify sock %d not found", sock); | |
1031 | goto error; | |
1032 | } | |
1033 | ||
1034 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
1035 | ||
1036 | error: | |
1037 | return NULL; | |
1038 | } | |
1039 | ||
025faf73 DG |
1040 | /* |
1041 | * Lookup for an ust app event based on event name, filter bytecode and the | |
1042 | * event loglevel. | |
1043 | * | |
1044 | * Return an ust_app_event object or NULL on error. | |
1045 | */ | |
18eace3b | 1046 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
39c5a3a7 JI |
1047 | char *name, struct lttng_ust_filter_bytecode *filter, int loglevel, |
1048 | const struct lttng_event_exclusion *exclusion) | |
18eace3b DG |
1049 | { |
1050 | struct lttng_ht_iter iter; | |
1051 | struct lttng_ht_node_str *node; | |
1052 | struct ust_app_event *event = NULL; | |
1053 | struct ust_app_ht_key key; | |
18eace3b DG |
1054 | |
1055 | assert(name); | |
1056 | assert(ht); | |
1057 | ||
1058 | /* Setup key for event lookup. */ | |
1059 | key.name = name; | |
1060 | key.filter = filter; | |
1061 | key.loglevel = loglevel; | |
39c5a3a7 JI |
1062 | /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */ |
1063 | key.exclusion = (struct lttng_ust_event_exclusion *)exclusion; | |
18eace3b | 1064 | |
025faf73 DG |
1065 | /* Lookup using the event name as hash and a custom match fct. */ |
1066 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1067 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1068 | node = lttng_ht_iter_get_node_str(&iter); |
1069 | if (node == NULL) { | |
1070 | goto end; | |
1071 | } | |
1072 | ||
1073 | event = caa_container_of(node, struct ust_app_event, node); | |
1074 | ||
1075 | end: | |
18eace3b DG |
1076 | return event; |
1077 | } | |
1078 | ||
55cc08a6 DG |
1079 | /* |
1080 | * Create the channel context on the tracer. | |
d0b96690 DG |
1081 | * |
1082 | * Called with UST app session lock held. | |
55cc08a6 DG |
1083 | */ |
1084 | static | |
1085 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1086 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1087 | { | |
1088 | int ret; | |
1089 | ||
840cb59c | 1090 | health_code_update(); |
86acf0da | 1091 | |
852d0037 | 1092 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 DG |
1093 | ua_chan->obj, &ua_ctx->obj); |
1094 | if (ret < 0) { | |
ffe60014 DG |
1095 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1096 | ERR("UST app create channel context failed for app (pid: %d) " | |
1097 | "with ret %d", app->pid, ret); | |
1098 | } else { | |
3757b385 DG |
1099 | /* |
1100 | * This is normal behavior, an application can die during the | |
1101 | * creation process. Don't report an error so the execution can | |
1102 | * continue normally. | |
1103 | */ | |
1104 | ret = 0; | |
ffe60014 DG |
1105 | DBG3("UST app disable event failed. Application is dead."); |
1106 | } | |
55cc08a6 DG |
1107 | goto error; |
1108 | } | |
1109 | ||
1110 | ua_ctx->handle = ua_ctx->obj->handle; | |
1111 | ||
d0b96690 DG |
1112 | DBG2("UST app context handle %d created successfully for channel %s", |
1113 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1114 | |
1115 | error: | |
840cb59c | 1116 | health_code_update(); |
55cc08a6 DG |
1117 | return ret; |
1118 | } | |
1119 | ||
53a80697 MD |
1120 | /* |
1121 | * Set the filter on the tracer. | |
1122 | */ | |
1123 | static | |
1124 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
1125 | struct ust_app *app) | |
1126 | { | |
1127 | int ret; | |
1128 | ||
840cb59c | 1129 | health_code_update(); |
86acf0da | 1130 | |
53a80697 | 1131 | if (!ua_event->filter) { |
86acf0da DG |
1132 | ret = 0; |
1133 | goto error; | |
53a80697 MD |
1134 | } |
1135 | ||
1136 | ret = ustctl_set_filter(app->sock, ua_event->filter, | |
1137 | ua_event->obj); | |
1138 | if (ret < 0) { | |
ffe60014 DG |
1139 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1140 | ERR("UST app event %s filter failed for app (pid: %d) " | |
1141 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1142 | } else { | |
3757b385 DG |
1143 | /* |
1144 | * This is normal behavior, an application can die during the | |
1145 | * creation process. Don't report an error so the execution can | |
1146 | * continue normally. | |
1147 | */ | |
1148 | ret = 0; | |
ffe60014 DG |
1149 | DBG3("UST app filter event failed. Application is dead."); |
1150 | } | |
53a80697 MD |
1151 | goto error; |
1152 | } | |
1153 | ||
1154 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
1155 | ||
1156 | error: | |
840cb59c | 1157 | health_code_update(); |
53a80697 MD |
1158 | return ret; |
1159 | } | |
1160 | ||
7cc9a73c JI |
1161 | /* |
1162 | * Set event exclusions on the tracer. | |
1163 | */ | |
1164 | static | |
1165 | int set_ust_event_exclusion(struct ust_app_event *ua_event, | |
1166 | struct ust_app *app) | |
1167 | { | |
1168 | int ret; | |
1169 | ||
1170 | health_code_update(); | |
1171 | ||
1172 | if (!ua_event->exclusion || !ua_event->exclusion->count) { | |
1173 | ret = 0; | |
1174 | goto error; | |
1175 | } | |
1176 | ||
1177 | ret = ustctl_set_exclusion(app->sock, ua_event->exclusion, | |
1178 | ua_event->obj); | |
1179 | if (ret < 0) { | |
1180 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1181 | ERR("UST app event %s exclusions failed for app (pid: %d) " | |
1182 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1183 | } else { | |
1184 | /* | |
1185 | * This is normal behavior, an application can die during the | |
1186 | * creation process. Don't report an error so the execution can | |
1187 | * continue normally. | |
1188 | */ | |
1189 | ret = 0; | |
1190 | DBG3("UST app event exclusion failed. Application is dead."); | |
1191 | } | |
1192 | goto error; | |
1193 | } | |
1194 | ||
1195 | DBG2("UST exclusion set successfully for event %s", ua_event->name); | |
1196 | ||
1197 | error: | |
1198 | health_code_update(); | |
1199 | return ret; | |
1200 | } | |
1201 | ||
9730260e DG |
1202 | /* |
1203 | * Disable the specified event on to UST tracer for the UST session. | |
1204 | */ | |
1205 | static int disable_ust_event(struct ust_app *app, | |
1206 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1207 | { | |
1208 | int ret; | |
1209 | ||
840cb59c | 1210 | health_code_update(); |
86acf0da | 1211 | |
852d0037 | 1212 | ret = ustctl_disable(app->sock, ua_event->obj); |
9730260e | 1213 | if (ret < 0) { |
ffe60014 DG |
1214 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1215 | ERR("UST app event %s disable failed for app (pid: %d) " | |
1216 | "and session handle %d with ret %d", | |
1217 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1218 | } else { | |
3757b385 DG |
1219 | /* |
1220 | * This is normal behavior, an application can die during the | |
1221 | * creation process. Don't report an error so the execution can | |
1222 | * continue normally. | |
1223 | */ | |
1224 | ret = 0; | |
ffe60014 DG |
1225 | DBG3("UST app disable event failed. Application is dead."); |
1226 | } | |
9730260e DG |
1227 | goto error; |
1228 | } | |
1229 | ||
1230 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 1231 | ua_event->attr.name, app->pid); |
9730260e DG |
1232 | |
1233 | error: | |
840cb59c | 1234 | health_code_update(); |
9730260e DG |
1235 | return ret; |
1236 | } | |
1237 | ||
78f0bacd DG |
1238 | /* |
1239 | * Disable the specified channel on to UST tracer for the UST session. | |
1240 | */ | |
1241 | static int disable_ust_channel(struct ust_app *app, | |
1242 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1243 | { | |
1244 | int ret; | |
1245 | ||
840cb59c | 1246 | health_code_update(); |
86acf0da | 1247 | |
852d0037 | 1248 | ret = ustctl_disable(app->sock, ua_chan->obj); |
78f0bacd | 1249 | if (ret < 0) { |
ffe60014 DG |
1250 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1251 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1252 | "and session handle %d with ret %d", | |
1253 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1254 | } else { | |
3757b385 DG |
1255 | /* |
1256 | * This is normal behavior, an application can die during the | |
1257 | * creation process. Don't report an error so the execution can | |
1258 | * continue normally. | |
1259 | */ | |
1260 | ret = 0; | |
ffe60014 DG |
1261 | DBG3("UST app disable channel failed. Application is dead."); |
1262 | } | |
78f0bacd DG |
1263 | goto error; |
1264 | } | |
1265 | ||
78f0bacd | 1266 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1267 | ua_chan->name, app->pid); |
78f0bacd DG |
1268 | |
1269 | error: | |
840cb59c | 1270 | health_code_update(); |
78f0bacd DG |
1271 | return ret; |
1272 | } | |
1273 | ||
1274 | /* | |
1275 | * Enable the specified channel on to UST tracer for the UST session. | |
1276 | */ | |
1277 | static int enable_ust_channel(struct ust_app *app, | |
1278 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1279 | { | |
1280 | int ret; | |
1281 | ||
840cb59c | 1282 | health_code_update(); |
86acf0da | 1283 | |
852d0037 | 1284 | ret = ustctl_enable(app->sock, ua_chan->obj); |
78f0bacd | 1285 | if (ret < 0) { |
ffe60014 DG |
1286 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1287 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1288 | "and session handle %d with ret %d", | |
1289 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1290 | } else { | |
3757b385 DG |
1291 | /* |
1292 | * This is normal behavior, an application can die during the | |
1293 | * creation process. Don't report an error so the execution can | |
1294 | * continue normally. | |
1295 | */ | |
1296 | ret = 0; | |
ffe60014 DG |
1297 | DBG3("UST app enable channel failed. Application is dead."); |
1298 | } | |
78f0bacd DG |
1299 | goto error; |
1300 | } | |
1301 | ||
1302 | ua_chan->enabled = 1; | |
1303 | ||
1304 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1305 | ua_chan->name, app->pid); |
78f0bacd DG |
1306 | |
1307 | error: | |
840cb59c | 1308 | health_code_update(); |
78f0bacd DG |
1309 | return ret; |
1310 | } | |
1311 | ||
edb67388 DG |
1312 | /* |
1313 | * Enable the specified event on to UST tracer for the UST session. | |
1314 | */ | |
1315 | static int enable_ust_event(struct ust_app *app, | |
1316 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1317 | { | |
1318 | int ret; | |
1319 | ||
840cb59c | 1320 | health_code_update(); |
86acf0da | 1321 | |
852d0037 | 1322 | ret = ustctl_enable(app->sock, ua_event->obj); |
edb67388 | 1323 | if (ret < 0) { |
ffe60014 DG |
1324 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1325 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1326 | "and session handle %d with ret %d", | |
1327 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1328 | } else { | |
3757b385 DG |
1329 | /* |
1330 | * This is normal behavior, an application can die during the | |
1331 | * creation process. Don't report an error so the execution can | |
1332 | * continue normally. | |
1333 | */ | |
1334 | ret = 0; | |
ffe60014 DG |
1335 | DBG3("UST app enable event failed. Application is dead."); |
1336 | } | |
edb67388 DG |
1337 | goto error; |
1338 | } | |
1339 | ||
1340 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1341 | ua_event->attr.name, app->pid); |
edb67388 DG |
1342 | |
1343 | error: | |
840cb59c | 1344 | health_code_update(); |
edb67388 DG |
1345 | return ret; |
1346 | } | |
1347 | ||
099e26bd | 1348 | /* |
7972aab2 | 1349 | * Send channel and stream buffer to application. |
4f3ab6ee | 1350 | * |
ffe60014 | 1351 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1352 | */ |
7972aab2 DG |
1353 | static int send_channel_pid_to_ust(struct ust_app *app, |
1354 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1355 | { |
1356 | int ret; | |
ffe60014 | 1357 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1358 | |
1359 | assert(app); | |
ffe60014 | 1360 | assert(ua_sess); |
4f3ab6ee | 1361 | assert(ua_chan); |
4f3ab6ee | 1362 | |
840cb59c | 1363 | health_code_update(); |
4f3ab6ee | 1364 | |
7972aab2 DG |
1365 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1366 | app->sock); | |
86acf0da | 1367 | |
ffe60014 DG |
1368 | /* Send channel to the application. */ |
1369 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
5b4a0ec0 | 1370 | if (ret < 0) { |
b551a063 DG |
1371 | goto error; |
1372 | } | |
1373 | ||
d88aee68 DG |
1374 | health_code_update(); |
1375 | ||
ffe60014 DG |
1376 | /* Send all streams to application. */ |
1377 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1378 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
1379 | if (ret < 0) { | |
1380 | goto error; | |
1381 | } | |
1382 | /* We don't need the stream anymore once sent to the tracer. */ | |
1383 | cds_list_del(&stream->list); | |
1384 | delete_ust_app_stream(-1, stream); | |
1385 | } | |
ffe60014 DG |
1386 | /* Flag the channel that it is sent to the application. */ |
1387 | ua_chan->is_sent = 1; | |
ffe60014 | 1388 | |
b551a063 | 1389 | error: |
840cb59c | 1390 | health_code_update(); |
b551a063 DG |
1391 | return ret; |
1392 | } | |
1393 | ||
91d76f53 | 1394 | /* |
5b4a0ec0 | 1395 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1396 | * |
1397 | * Should be called with session mutex held. | |
91d76f53 | 1398 | */ |
edb67388 DG |
1399 | static |
1400 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1401 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1402 | { |
5b4a0ec0 | 1403 | int ret = 0; |
284d8f55 | 1404 | |
840cb59c | 1405 | health_code_update(); |
86acf0da | 1406 | |
5b4a0ec0 | 1407 | /* Create UST event on tracer */ |
852d0037 | 1408 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 DG |
1409 | &ua_event->obj); |
1410 | if (ret < 0) { | |
ffe60014 DG |
1411 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1412 | ERR("Error ustctl create event %s for app pid: %d with ret %d", | |
1413 | ua_event->attr.name, app->pid, ret); | |
1414 | } else { | |
3757b385 DG |
1415 | /* |
1416 | * This is normal behavior, an application can die during the | |
1417 | * creation process. Don't report an error so the execution can | |
1418 | * continue normally. | |
1419 | */ | |
1420 | ret = 0; | |
ffe60014 DG |
1421 | DBG3("UST app create event failed. Application is dead."); |
1422 | } | |
5b4a0ec0 | 1423 | goto error; |
91d76f53 | 1424 | } |
f6a9efaa | 1425 | |
5b4a0ec0 | 1426 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1427 | |
5b4a0ec0 | 1428 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1429 | ua_event->attr.name, app->pid); |
f6a9efaa | 1430 | |
840cb59c | 1431 | health_code_update(); |
86acf0da | 1432 | |
025faf73 DG |
1433 | /* Set filter if one is present. */ |
1434 | if (ua_event->filter) { | |
1435 | ret = set_ust_event_filter(ua_event, app); | |
1436 | if (ret < 0) { | |
1437 | goto error; | |
1438 | } | |
1439 | } | |
1440 | ||
7cc9a73c JI |
1441 | /* Set exclusions for the event */ |
1442 | if (ua_event->exclusion) { | |
1443 | ret = set_ust_event_exclusion(ua_event, app); | |
1444 | if (ret < 0) { | |
1445 | goto error; | |
1446 | } | |
1447 | } | |
1448 | ||
8535a6d9 | 1449 | /* If event not enabled, disable it on the tracer */ |
40113787 MD |
1450 | if (ua_event->enabled) { |
1451 | /* | |
1452 | * We now need to explicitly enable the event, since it | |
1453 | * is now disabled at creation. | |
1454 | */ | |
1455 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1456 | if (ret < 0) { | |
1457 | /* | |
1458 | * If we hit an EPERM, something is wrong with our enable call. If | |
1459 | * we get an EEXIST, there is a problem on the tracer side since we | |
1460 | * just created it. | |
1461 | */ | |
1462 | switch (ret) { | |
1463 | case -LTTNG_UST_ERR_PERM: | |
1464 | /* Code flow problem */ | |
1465 | assert(0); | |
1466 | case -LTTNG_UST_ERR_EXIST: | |
1467 | /* It's OK for our use case. */ | |
1468 | ret = 0; | |
1469 | break; | |
1470 | default: | |
1471 | break; | |
1472 | } | |
1473 | goto error; | |
1474 | } | |
8535a6d9 DG |
1475 | } |
1476 | ||
5b4a0ec0 | 1477 | error: |
840cb59c | 1478 | health_code_update(); |
5b4a0ec0 | 1479 | return ret; |
91d76f53 | 1480 | } |
48842b30 | 1481 | |
5b4a0ec0 DG |
1482 | /* |
1483 | * Copy data between an UST app event and a LTT event. | |
1484 | */ | |
421cb601 | 1485 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1486 | struct ltt_ust_event *uevent) |
1487 | { | |
b4ffad32 JI |
1488 | size_t exclusion_alloc_size; |
1489 | ||
48842b30 DG |
1490 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); |
1491 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1492 | ||
fc34caaa DG |
1493 | ua_event->enabled = uevent->enabled; |
1494 | ||
5b4a0ec0 DG |
1495 | /* Copy event attributes */ |
1496 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1497 | ||
53a80697 MD |
1498 | /* Copy filter bytecode */ |
1499 | if (uevent->filter) { | |
025faf73 DG |
1500 | ua_event->filter = alloc_copy_ust_app_filter(uevent->filter); |
1501 | /* Filter might be NULL here in case of ENONEM. */ | |
53a80697 | 1502 | } |
b4ffad32 JI |
1503 | |
1504 | /* Copy exclusion data */ | |
1505 | if (uevent->exclusion) { | |
1506 | exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) + | |
1507 | LTTNG_UST_SYM_NAME_LEN * uevent->exclusion->count; | |
1508 | ua_event->exclusion = zmalloc(exclusion_alloc_size); | |
5f8df26c JI |
1509 | if (ua_event->exclusion == NULL) { |
1510 | PERROR("malloc"); | |
1511 | } else { | |
1512 | memcpy(ua_event->exclusion, uevent->exclusion, | |
1513 | exclusion_alloc_size); | |
b4ffad32 JI |
1514 | } |
1515 | } | |
48842b30 DG |
1516 | } |
1517 | ||
5b4a0ec0 DG |
1518 | /* |
1519 | * Copy data between an UST app channel and a LTT channel. | |
1520 | */ | |
421cb601 | 1521 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1522 | struct ltt_ust_channel *uchan) |
1523 | { | |
bec39940 | 1524 | struct lttng_ht_iter iter; |
48842b30 | 1525 | struct ltt_ust_event *uevent; |
55cc08a6 | 1526 | struct ltt_ust_context *uctx; |
48842b30 | 1527 | struct ust_app_event *ua_event; |
55cc08a6 | 1528 | struct ust_app_ctx *ua_ctx; |
48842b30 | 1529 | |
fc34caaa | 1530 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1531 | |
1532 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1533 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 1534 | |
1624d5b7 JD |
1535 | ua_chan->tracefile_size = uchan->tracefile_size; |
1536 | ua_chan->tracefile_count = uchan->tracefile_count; | |
1537 | ||
ffe60014 DG |
1538 | /* Copy event attributes since the layout is different. */ |
1539 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1540 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1541 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1542 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1543 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
1544 | ua_chan->attr.output = uchan->attr.output; | |
1545 | /* | |
1546 | * Note that the attribute channel type is not set since the channel on the | |
1547 | * tracing registry side does not have this information. | |
1548 | */ | |
48842b30 | 1549 | |
fc34caaa | 1550 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1551 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1552 | |
31746f93 | 1553 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { |
55cc08a6 DG |
1554 | ua_ctx = alloc_ust_app_ctx(&uctx->ctx); |
1555 | if (ua_ctx == NULL) { | |
1556 | continue; | |
1557 | } | |
bec39940 DG |
1558 | lttng_ht_node_init_ulong(&ua_ctx->node, |
1559 | (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 1560 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 1561 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
55cc08a6 | 1562 | } |
48842b30 | 1563 | |
421cb601 | 1564 | /* Copy all events from ltt ust channel to ust app channel */ |
bec39940 | 1565 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
18eace3b | 1566 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 1567 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 1568 | if (ua_event == NULL) { |
421cb601 | 1569 | DBG2("UST event %s not found on shadow copy channel", |
48842b30 | 1570 | uevent->attr.name); |
284d8f55 | 1571 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
48842b30 | 1572 | if (ua_event == NULL) { |
5b4a0ec0 | 1573 | continue; |
48842b30 | 1574 | } |
421cb601 | 1575 | shadow_copy_event(ua_event, uevent); |
d0b96690 | 1576 | add_unique_ust_app_event(ua_chan, ua_event); |
48842b30 | 1577 | } |
48842b30 DG |
1578 | } |
1579 | ||
fc34caaa | 1580 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1581 | } |
1582 | ||
5b4a0ec0 DG |
1583 | /* |
1584 | * Copy data between a UST app session and a regular LTT session. | |
1585 | */ | |
421cb601 | 1586 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1587 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1588 | { |
bec39940 DG |
1589 | struct lttng_ht_node_str *ua_chan_node; |
1590 | struct lttng_ht_iter iter; | |
48842b30 DG |
1591 | struct ltt_ust_channel *uchan; |
1592 | struct ust_app_channel *ua_chan; | |
477d7741 MD |
1593 | time_t rawtime; |
1594 | struct tm *timeinfo; | |
1595 | char datetime[16]; | |
1596 | int ret; | |
1597 | ||
1598 | /* Get date and time for unique app path */ | |
1599 | time(&rawtime); | |
1600 | timeinfo = localtime(&rawtime); | |
1601 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1602 | |
421cb601 | 1603 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1604 | |
7972aab2 DG |
1605 | ua_sess->tracing_id = usess->id; |
1606 | ua_sess->id = get_next_session_id(); | |
1607 | ua_sess->uid = app->uid; | |
1608 | ua_sess->gid = app->gid; | |
1609 | ua_sess->euid = usess->uid; | |
1610 | ua_sess->egid = usess->gid; | |
1611 | ua_sess->buffer_type = usess->buffer_type; | |
1612 | ua_sess->bits_per_long = app->bits_per_long; | |
1613 | /* There is only one consumer object per session possible. */ | |
1614 | ua_sess->consumer = usess->consumer; | |
2bba9e53 | 1615 | ua_sess->output_traces = usess->output_traces; |
ecc48a90 | 1616 | ua_sess->live_timer_interval = usess->live_timer_interval; |
84ad93e8 DG |
1617 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, |
1618 | &usess->metadata_attr); | |
7972aab2 DG |
1619 | |
1620 | switch (ua_sess->buffer_type) { | |
1621 | case LTTNG_BUFFER_PER_PID: | |
1622 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 1623 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
1624 | datetime); |
1625 | break; | |
1626 | case LTTNG_BUFFER_PER_UID: | |
1627 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1628 | DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long); | |
1629 | break; | |
1630 | default: | |
1631 | assert(0); | |
1632 | goto error; | |
1633 | } | |
477d7741 MD |
1634 | if (ret < 0) { |
1635 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1636 | assert(0); |
7972aab2 | 1637 | goto error; |
477d7741 MD |
1638 | } |
1639 | ||
48842b30 | 1640 | /* Iterate over all channels in global domain. */ |
bec39940 DG |
1641 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, |
1642 | uchan, node.node) { | |
1643 | struct lttng_ht_iter uiter; | |
ba767faf | 1644 | |
bec39940 DG |
1645 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
1646 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
5b4a0ec0 | 1647 | if (ua_chan_node != NULL) { |
fc34caaa | 1648 | /* Session exist. Contiuing. */ |
5b4a0ec0 DG |
1649 | continue; |
1650 | } | |
421cb601 | 1651 | |
5b4a0ec0 DG |
1652 | DBG2("Channel %s not found on shadow session copy, creating it", |
1653 | uchan->name); | |
d0b96690 | 1654 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
5b4a0ec0 | 1655 | if (ua_chan == NULL) { |
fc34caaa | 1656 | /* malloc failed FIXME: Might want to do handle ENOMEM .. */ |
5b4a0ec0 | 1657 | continue; |
48842b30 | 1658 | } |
5b4a0ec0 | 1659 | shadow_copy_channel(ua_chan, uchan); |
ffe60014 DG |
1660 | /* |
1661 | * The concept of metadata channel does not exist on the tracing | |
1662 | * registry side of the session daemon so this can only be a per CPU | |
1663 | * channel and not metadata. | |
1664 | */ | |
1665 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
1666 | ||
bec39940 | 1667 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); |
48842b30 | 1668 | } |
7972aab2 DG |
1669 | |
1670 | error: | |
1671 | return; | |
48842b30 DG |
1672 | } |
1673 | ||
78f0bacd DG |
1674 | /* |
1675 | * Lookup sesison wrapper. | |
1676 | */ | |
84cd17c6 MD |
1677 | static |
1678 | void __lookup_session_by_app(struct ltt_ust_session *usess, | |
bec39940 | 1679 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1680 | { |
1681 | /* Get right UST app session from app */ | |
d9bf3ca4 | 1682 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
1683 | } |
1684 | ||
421cb601 DG |
1685 | /* |
1686 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1687 | * id. |
421cb601 | 1688 | */ |
48842b30 DG |
1689 | static struct ust_app_session *lookup_session_by_app( |
1690 | struct ltt_ust_session *usess, struct ust_app *app) | |
1691 | { | |
bec39940 | 1692 | struct lttng_ht_iter iter; |
d9bf3ca4 | 1693 | struct lttng_ht_node_u64 *node; |
48842b30 | 1694 | |
84cd17c6 | 1695 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 1696 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
1697 | if (node == NULL) { |
1698 | goto error; | |
1699 | } | |
1700 | ||
1701 | return caa_container_of(node, struct ust_app_session, node); | |
1702 | ||
1703 | error: | |
1704 | return NULL; | |
1705 | } | |
1706 | ||
7972aab2 DG |
1707 | /* |
1708 | * Setup buffer registry per PID for the given session and application. If none | |
1709 | * is found, a new one is created, added to the global registry and | |
1710 | * initialized. If regp is valid, it's set with the newly created object. | |
1711 | * | |
1712 | * Return 0 on success or else a negative value. | |
1713 | */ | |
1714 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
1715 | struct ust_app *app, struct buffer_reg_pid **regp) | |
1716 | { | |
1717 | int ret = 0; | |
1718 | struct buffer_reg_pid *reg_pid; | |
1719 | ||
1720 | assert(ua_sess); | |
1721 | assert(app); | |
1722 | ||
1723 | rcu_read_lock(); | |
1724 | ||
1725 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
1726 | if (!reg_pid) { | |
1727 | /* | |
1728 | * This is the create channel path meaning that if there is NO | |
1729 | * registry available, we have to create one for this session. | |
1730 | */ | |
1731 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid); | |
1732 | if (ret < 0) { | |
1733 | goto error; | |
1734 | } | |
7972aab2 DG |
1735 | } else { |
1736 | goto end; | |
1737 | } | |
1738 | ||
1739 | /* Initialize registry. */ | |
1740 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
1741 | app->bits_per_long, app->uint8_t_alignment, | |
1742 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1743 | app->uint64_t_alignment, app->long_alignment, |
1744 | app->byte_order, app->version.major, | |
1745 | app->version.minor); | |
7972aab2 | 1746 | if (ret < 0) { |
286c991a MD |
1747 | /* |
1748 | * reg_pid->registry->reg.ust is NULL upon error, so we need to | |
1749 | * destroy the buffer registry, because it is always expected | |
1750 | * that if the buffer registry can be found, its ust registry is | |
1751 | * non-NULL. | |
1752 | */ | |
1753 | buffer_reg_pid_destroy(reg_pid); | |
7972aab2 DG |
1754 | goto error; |
1755 | } | |
1756 | ||
286c991a MD |
1757 | buffer_reg_pid_add(reg_pid); |
1758 | ||
7972aab2 DG |
1759 | DBG3("UST app buffer registry per PID created successfully"); |
1760 | ||
1761 | end: | |
1762 | if (regp) { | |
1763 | *regp = reg_pid; | |
1764 | } | |
1765 | error: | |
1766 | rcu_read_unlock(); | |
1767 | return ret; | |
1768 | } | |
1769 | ||
1770 | /* | |
1771 | * Setup buffer registry per UID for the given session and application. If none | |
1772 | * is found, a new one is created, added to the global registry and | |
1773 | * initialized. If regp is valid, it's set with the newly created object. | |
1774 | * | |
1775 | * Return 0 on success or else a negative value. | |
1776 | */ | |
1777 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
1778 | struct ust_app *app, struct buffer_reg_uid **regp) | |
1779 | { | |
1780 | int ret = 0; | |
1781 | struct buffer_reg_uid *reg_uid; | |
1782 | ||
1783 | assert(usess); | |
1784 | assert(app); | |
1785 | ||
1786 | rcu_read_lock(); | |
1787 | ||
1788 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
1789 | if (!reg_uid) { | |
1790 | /* | |
1791 | * This is the create channel path meaning that if there is NO | |
1792 | * registry available, we have to create one for this session. | |
1793 | */ | |
1794 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
1795 | LTTNG_DOMAIN_UST, ®_uid); | |
1796 | if (ret < 0) { | |
1797 | goto error; | |
1798 | } | |
7972aab2 DG |
1799 | } else { |
1800 | goto end; | |
1801 | } | |
1802 | ||
1803 | /* Initialize registry. */ | |
af6142cf | 1804 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
1805 | app->bits_per_long, app->uint8_t_alignment, |
1806 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1807 | app->uint64_t_alignment, app->long_alignment, |
1808 | app->byte_order, app->version.major, | |
1809 | app->version.minor); | |
7972aab2 | 1810 | if (ret < 0) { |
286c991a MD |
1811 | /* |
1812 | * reg_uid->registry->reg.ust is NULL upon error, so we need to | |
1813 | * destroy the buffer registry, because it is always expected | |
1814 | * that if the buffer registry can be found, its ust registry is | |
1815 | * non-NULL. | |
1816 | */ | |
1817 | buffer_reg_uid_destroy(reg_uid, NULL); | |
7972aab2 DG |
1818 | goto error; |
1819 | } | |
1820 | /* Add node to teardown list of the session. */ | |
1821 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
1822 | ||
286c991a | 1823 | buffer_reg_uid_add(reg_uid); |
7972aab2 | 1824 | |
286c991a | 1825 | DBG3("UST app buffer registry per UID created successfully"); |
7972aab2 DG |
1826 | end: |
1827 | if (regp) { | |
1828 | *regp = reg_uid; | |
1829 | } | |
1830 | error: | |
1831 | rcu_read_unlock(); | |
1832 | return ret; | |
1833 | } | |
1834 | ||
421cb601 | 1835 | /* |
3d8ca23b | 1836 | * Create a session on the tracer side for the given app. |
421cb601 | 1837 | * |
3d8ca23b DG |
1838 | * On success, ua_sess_ptr is populated with the session pointer or else left |
1839 | * untouched. If the session was created, is_created is set to 1. On error, | |
1840 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
1841 | * be NULL. | |
1842 | * | |
1843 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
1844 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 1845 | */ |
3d8ca23b DG |
1846 | static int create_ust_app_session(struct ltt_ust_session *usess, |
1847 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, | |
1848 | int *is_created) | |
421cb601 | 1849 | { |
3d8ca23b | 1850 | int ret, created = 0; |
421cb601 DG |
1851 | struct ust_app_session *ua_sess; |
1852 | ||
3d8ca23b DG |
1853 | assert(usess); |
1854 | assert(app); | |
1855 | assert(ua_sess_ptr); | |
1856 | ||
840cb59c | 1857 | health_code_update(); |
86acf0da | 1858 | |
421cb601 DG |
1859 | ua_sess = lookup_session_by_app(usess, app); |
1860 | if (ua_sess == NULL) { | |
d9bf3ca4 | 1861 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 1862 | app->pid, usess->id); |
d0b96690 | 1863 | ua_sess = alloc_ust_app_session(app); |
421cb601 DG |
1864 | if (ua_sess == NULL) { |
1865 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
1866 | ret = -ENOMEM; |
1867 | goto error; | |
421cb601 | 1868 | } |
477d7741 | 1869 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 1870 | created = 1; |
421cb601 DG |
1871 | } |
1872 | ||
7972aab2 DG |
1873 | switch (usess->buffer_type) { |
1874 | case LTTNG_BUFFER_PER_PID: | |
1875 | /* Init local registry. */ | |
1876 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 1877 | if (ret < 0) { |
e64207cf | 1878 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
1879 | goto error; |
1880 | } | |
1881 | break; | |
1882 | case LTTNG_BUFFER_PER_UID: | |
1883 | /* Look for a global registry. If none exists, create one. */ | |
1884 | ret = setup_buffer_reg_uid(usess, app, NULL); | |
1885 | if (ret < 0) { | |
e64207cf | 1886 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
1887 | goto error; |
1888 | } | |
1889 | break; | |
1890 | default: | |
1891 | assert(0); | |
1892 | ret = -EINVAL; | |
1893 | goto error; | |
1894 | } | |
1895 | ||
1896 | health_code_update(); | |
1897 | ||
1898 | if (ua_sess->handle == -1) { | |
1899 | ret = ustctl_create_session(app->sock); | |
1900 | if (ret < 0) { | |
1901 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1902 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
1903 | app->pid, ret); |
1904 | } else { | |
1905 | DBG("UST app creating session failed. Application is dead"); | |
3757b385 DG |
1906 | /* |
1907 | * This is normal behavior, an application can die during the | |
1908 | * creation process. Don't report an error so the execution can | |
1909 | * continue normally. This will get flagged ENOTCONN and the | |
1910 | * caller will handle it. | |
1911 | */ | |
1912 | ret = 0; | |
ffe60014 | 1913 | } |
d0b96690 | 1914 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
1915 | if (ret != -ENOMEM) { |
1916 | /* | |
1917 | * Tracer is probably gone or got an internal error so let's | |
1918 | * behave like it will soon unregister or not usable. | |
1919 | */ | |
1920 | ret = -ENOTCONN; | |
1921 | } | |
1922 | goto error; | |
421cb601 DG |
1923 | } |
1924 | ||
7972aab2 DG |
1925 | ua_sess->handle = ret; |
1926 | ||
1927 | /* Add ust app session to app's HT */ | |
d9bf3ca4 MD |
1928 | lttng_ht_node_init_u64(&ua_sess->node, |
1929 | ua_sess->tracing_id); | |
1930 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
7972aab2 DG |
1931 | |
1932 | DBG2("UST app session created successfully with handle %d", ret); | |
1933 | } | |
1934 | ||
1935 | *ua_sess_ptr = ua_sess; | |
1936 | if (is_created) { | |
1937 | *is_created = created; | |
1938 | } | |
1939 | ||
1940 | /* Everything went well. */ | |
1941 | ret = 0; | |
1942 | ||
1943 | error: | |
1944 | health_code_update(); | |
1945 | return ret; | |
1946 | } | |
1947 | ||
6a6b2068 JG |
1948 | /* |
1949 | * Match function for a hash table lookup of ust_app_ctx. | |
1950 | * | |
1951 | * It matches an ust app context based on the context type and, in the case | |
1952 | * of perf counters, their name. | |
1953 | */ | |
1954 | static int ht_match_ust_app_ctx(struct cds_lfht_node *node, const void *_key) | |
1955 | { | |
1956 | struct ust_app_ctx *ctx; | |
1957 | const struct lttng_ust_context *key; | |
1958 | ||
1959 | assert(node); | |
1960 | assert(_key); | |
1961 | ||
1962 | ctx = caa_container_of(node, struct ust_app_ctx, node.node); | |
1963 | key = _key; | |
1964 | ||
1965 | /* Context type */ | |
1966 | if (ctx->ctx.ctx != key->ctx) { | |
1967 | goto no_match; | |
1968 | } | |
1969 | ||
1970 | /* Check the name in the case of perf thread counters. */ | |
1971 | if (key->ctx == LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER) { | |
1972 | if (strncmp(key->u.perf_counter.name, | |
1973 | ctx->ctx.u.perf_counter.name, | |
1974 | sizeof(key->u.perf_counter.name))) { | |
1975 | goto no_match; | |
1976 | } | |
1977 | } | |
1978 | ||
1979 | /* Match. */ | |
1980 | return 1; | |
1981 | ||
1982 | no_match: | |
1983 | return 0; | |
1984 | } | |
1985 | ||
1986 | /* | |
1987 | * Lookup for an ust app context from an lttng_ust_context. | |
1988 | * | |
be184a0f | 1989 | * Must be called while holding RCU read side lock. |
6a6b2068 JG |
1990 | * Return an ust_app_ctx object or NULL on error. |
1991 | */ | |
1992 | static | |
1993 | struct ust_app_ctx *find_ust_app_context(struct lttng_ht *ht, | |
1994 | struct lttng_ust_context *uctx) | |
1995 | { | |
1996 | struct lttng_ht_iter iter; | |
1997 | struct lttng_ht_node_ulong *node; | |
1998 | struct ust_app_ctx *app_ctx = NULL; | |
1999 | ||
2000 | assert(uctx); | |
2001 | assert(ht); | |
2002 | ||
2003 | /* Lookup using the lttng_ust_context_type and a custom match fct. */ | |
2004 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) uctx->ctx, lttng_ht_seed), | |
2005 | ht_match_ust_app_ctx, uctx, &iter.iter); | |
2006 | node = lttng_ht_iter_get_node_ulong(&iter); | |
2007 | if (!node) { | |
2008 | goto end; | |
2009 | } | |
2010 | ||
2011 | app_ctx = caa_container_of(node, struct ust_app_ctx, node); | |
2012 | ||
2013 | end: | |
2014 | return app_ctx; | |
2015 | } | |
2016 | ||
7972aab2 DG |
2017 | /* |
2018 | * Create a context for the channel on the tracer. | |
2019 | * | |
2020 | * Called with UST app session lock held and a RCU read side lock. | |
2021 | */ | |
2022 | static | |
2023 | int create_ust_app_channel_context(struct ust_app_session *ua_sess, | |
2024 | struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx, | |
2025 | struct ust_app *app) | |
2026 | { | |
2027 | int ret = 0; | |
7972aab2 DG |
2028 | struct ust_app_ctx *ua_ctx; |
2029 | ||
2030 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
2031 | ||
6a6b2068 JG |
2032 | ua_ctx = find_ust_app_context(ua_chan->ctx, uctx); |
2033 | if (ua_ctx) { | |
7972aab2 DG |
2034 | ret = -EEXIST; |
2035 | goto error; | |
2036 | } | |
2037 | ||
2038 | ua_ctx = alloc_ust_app_ctx(uctx); | |
2039 | if (ua_ctx == NULL) { | |
2040 | /* malloc failed */ | |
2041 | ret = -1; | |
2042 | goto error; | |
2043 | } | |
2044 | ||
2045 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 2046 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 2047 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
2048 | |
2049 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
2050 | if (ret < 0) { | |
2051 | goto error; | |
2052 | } | |
2053 | ||
2054 | error: | |
2055 | return ret; | |
2056 | } | |
2057 | ||
2058 | /* | |
2059 | * Enable on the tracer side a ust app event for the session and channel. | |
2060 | * | |
2061 | * Called with UST app session lock held. | |
2062 | */ | |
2063 | static | |
2064 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
2065 | struct ust_app_event *ua_event, struct ust_app *app) | |
2066 | { | |
2067 | int ret; | |
2068 | ||
2069 | ret = enable_ust_event(app, ua_sess, ua_event); | |
2070 | if (ret < 0) { | |
2071 | goto error; | |
2072 | } | |
2073 | ||
2074 | ua_event->enabled = 1; | |
2075 | ||
2076 | error: | |
2077 | return ret; | |
2078 | } | |
2079 | ||
2080 | /* | |
2081 | * Disable on the tracer side a ust app event for the session and channel. | |
2082 | */ | |
2083 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
2084 | struct ust_app_event *ua_event, struct ust_app *app) | |
2085 | { | |
2086 | int ret; | |
2087 | ||
2088 | ret = disable_ust_event(app, ua_sess, ua_event); | |
2089 | if (ret < 0) { | |
2090 | goto error; | |
2091 | } | |
2092 | ||
2093 | ua_event->enabled = 0; | |
2094 | ||
2095 | error: | |
2096 | return ret; | |
2097 | } | |
2098 | ||
2099 | /* | |
2100 | * Lookup ust app channel for session and disable it on the tracer side. | |
2101 | */ | |
2102 | static | |
2103 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
2104 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
2105 | { | |
2106 | int ret; | |
2107 | ||
2108 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2109 | if (ret < 0) { | |
2110 | goto error; | |
2111 | } | |
2112 | ||
2113 | ua_chan->enabled = 0; | |
2114 | ||
2115 | error: | |
2116 | return ret; | |
2117 | } | |
2118 | ||
2119 | /* | |
2120 | * Lookup ust app channel for session and enable it on the tracer side. This | |
2121 | * MUST be called with a RCU read side lock acquired. | |
2122 | */ | |
2123 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
2124 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
2125 | { | |
2126 | int ret = 0; | |
2127 | struct lttng_ht_iter iter; | |
2128 | struct lttng_ht_node_str *ua_chan_node; | |
2129 | struct ust_app_channel *ua_chan; | |
2130 | ||
2131 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
2132 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
2133 | if (ua_chan_node == NULL) { | |
d9bf3ca4 | 2134 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
2135 | uchan->name, ua_sess->tracing_id); |
2136 | goto error; | |
2137 | } | |
2138 | ||
2139 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2140 | ||
2141 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
2142 | if (ret < 0) { | |
2143 | goto error; | |
2144 | } | |
2145 | ||
2146 | error: | |
2147 | return ret; | |
2148 | } | |
2149 | ||
2150 | /* | |
2151 | * Ask the consumer to create a channel and get it if successful. | |
2152 | * | |
2153 | * Return 0 on success or else a negative value. | |
2154 | */ | |
2155 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
2156 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
2157 | int bitness, struct ust_registry_session *registry) | |
2158 | { | |
2159 | int ret; | |
2160 | unsigned int nb_fd = 0; | |
2161 | struct consumer_socket *socket; | |
2162 | ||
2163 | assert(usess); | |
2164 | assert(ua_sess); | |
2165 | assert(ua_chan); | |
2166 | assert(registry); | |
2167 | ||
2168 | rcu_read_lock(); | |
2169 | health_code_update(); | |
2170 | ||
2171 | /* Get the right consumer socket for the application. */ | |
2172 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
2173 | if (!socket) { | |
2174 | ret = -EINVAL; | |
2175 | goto error; | |
2176 | } | |
2177 | ||
2178 | health_code_update(); | |
2179 | ||
2180 | /* Need one fd for the channel. */ | |
2181 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2182 | if (ret < 0) { | |
2183 | ERR("Exhausted number of available FD upon create channel"); | |
2184 | goto error; | |
2185 | } | |
2186 | ||
2187 | /* | |
2188 | * Ask consumer to create channel. The consumer will return the number of | |
2189 | * stream we have to expect. | |
2190 | */ | |
2191 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
2192 | registry); | |
2193 | if (ret < 0) { | |
2194 | goto error_ask; | |
2195 | } | |
2196 | ||
2197 | /* | |
2198 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2199 | * stream (2 being the default value here). | |
2200 | */ | |
2201 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2202 | ||
2203 | /* Reserve the amount of file descriptor we need. */ | |
2204 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2205 | if (ret < 0) { | |
2206 | ERR("Exhausted number of available FD upon create channel"); | |
2207 | goto error_fd_get_stream; | |
2208 | } | |
2209 | ||
2210 | health_code_update(); | |
2211 | ||
2212 | /* | |
2213 | * Now get the channel from the consumer. This call wil populate the stream | |
2214 | * list of that channel and set the ust objects. | |
2215 | */ | |
d9078d0c DG |
2216 | if (usess->consumer->enabled) { |
2217 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2218 | if (ret < 0) { | |
2219 | goto error_destroy; | |
2220 | } | |
7972aab2 DG |
2221 | } |
2222 | ||
2223 | rcu_read_unlock(); | |
2224 | return 0; | |
2225 | ||
2226 | error_destroy: | |
2227 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2228 | error_fd_get_stream: | |
2229 | /* | |
2230 | * Initiate a destroy channel on the consumer since we had an error | |
2231 | * handling it on our side. The return value is of no importance since we | |
2232 | * already have a ret value set by the previous error that we need to | |
2233 | * return. | |
2234 | */ | |
2235 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2236 | error_ask: | |
2237 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2238 | error: | |
2239 | health_code_update(); | |
2240 | rcu_read_unlock(); | |
2241 | return ret; | |
2242 | } | |
2243 | ||
2244 | /* | |
2245 | * Duplicate the ust data object of the ust app stream and save it in the | |
2246 | * buffer registry stream. | |
2247 | * | |
2248 | * Return 0 on success or else a negative value. | |
2249 | */ | |
2250 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2251 | struct ust_app_stream *stream) | |
2252 | { | |
2253 | int ret; | |
2254 | ||
2255 | assert(reg_stream); | |
2256 | assert(stream); | |
2257 | ||
2258 | /* Reserve the amount of file descriptor we need. */ | |
2259 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2260 | if (ret < 0) { | |
2261 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2262 | goto error; | |
2263 | } | |
2264 | ||
2265 | /* Duplicate object for stream once the original is in the registry. */ | |
2266 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2267 | reg_stream->obj.ust); | |
2268 | if (ret < 0) { | |
2269 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2270 | reg_stream->obj.ust, stream->obj, ret); | |
2271 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2272 | goto error; | |
2273 | } | |
2274 | stream->handle = stream->obj->handle; | |
2275 | ||
2276 | error: | |
2277 | return ret; | |
2278 | } | |
2279 | ||
2280 | /* | |
2281 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2282 | * buffer registry channel. | |
2283 | * | |
2284 | * Return 0 on success or else a negative value. | |
2285 | */ | |
2286 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2287 | struct ust_app_channel *ua_chan) | |
2288 | { | |
2289 | int ret; | |
2290 | ||
2291 | assert(reg_chan); | |
2292 | assert(ua_chan); | |
2293 | ||
2294 | /* Need two fds for the channel. */ | |
2295 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2296 | if (ret < 0) { | |
2297 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2298 | goto error_fd_get; | |
2299 | } | |
2300 | ||
2301 | /* Duplicate object for stream once the original is in the registry. */ | |
2302 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2303 | if (ret < 0) { | |
2304 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2305 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2306 | goto error; | |
2307 | } | |
2308 | ua_chan->handle = ua_chan->obj->handle; | |
2309 | ||
2310 | return 0; | |
2311 | ||
2312 | error: | |
2313 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2314 | error_fd_get: | |
2315 | return ret; | |
2316 | } | |
2317 | ||
2318 | /* | |
2319 | * For a given channel buffer registry, setup all streams of the given ust | |
2320 | * application channel. | |
2321 | * | |
2322 | * Return 0 on success or else a negative value. | |
2323 | */ | |
2324 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
2325 | struct ust_app_channel *ua_chan) | |
2326 | { | |
2327 | int ret = 0; | |
2328 | struct ust_app_stream *stream, *stmp; | |
2329 | ||
2330 | assert(reg_chan); | |
2331 | assert(ua_chan); | |
2332 | ||
2333 | DBG2("UST app setup buffer registry stream"); | |
2334 | ||
2335 | /* Send all streams to application. */ | |
2336 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2337 | struct buffer_reg_stream *reg_stream; | |
2338 | ||
2339 | ret = buffer_reg_stream_create(®_stream); | |
2340 | if (ret < 0) { | |
2341 | goto error; | |
2342 | } | |
2343 | ||
2344 | /* | |
2345 | * Keep original pointer and nullify it in the stream so the delete | |
2346 | * stream call does not release the object. | |
2347 | */ | |
2348 | reg_stream->obj.ust = stream->obj; | |
2349 | stream->obj = NULL; | |
2350 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2351 | |
7972aab2 DG |
2352 | /* We don't need the streams anymore. */ |
2353 | cds_list_del(&stream->list); | |
2354 | delete_ust_app_stream(-1, stream); | |
2355 | } | |
421cb601 | 2356 | |
7972aab2 DG |
2357 | error: |
2358 | return ret; | |
2359 | } | |
2360 | ||
2361 | /* | |
2362 | * Create a buffer registry channel for the given session registry and | |
2363 | * application channel object. If regp pointer is valid, it's set with the | |
2364 | * created object. Important, the created object is NOT added to the session | |
2365 | * registry hash table. | |
2366 | * | |
2367 | * Return 0 on success else a negative value. | |
2368 | */ | |
2369 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2370 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2371 | { | |
2372 | int ret; | |
2373 | struct buffer_reg_channel *reg_chan = NULL; | |
2374 | ||
2375 | assert(reg_sess); | |
2376 | assert(ua_chan); | |
2377 | ||
2378 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2379 | ||
2380 | /* Create buffer registry channel. */ | |
2381 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2382 | if (ret < 0) { | |
2383 | goto error_create; | |
421cb601 | 2384 | } |
7972aab2 DG |
2385 | assert(reg_chan); |
2386 | reg_chan->consumer_key = ua_chan->key; | |
8c924c7b | 2387 | reg_chan->subbuf_size = ua_chan->attr.subbuf_size; |
421cb601 | 2388 | |
7972aab2 DG |
2389 | /* Create and add a channel registry to session. */ |
2390 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2391 | ua_chan->tracing_channel_id); | |
2392 | if (ret < 0) { | |
2393 | goto error; | |
d88aee68 | 2394 | } |
7972aab2 | 2395 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2396 | |
7972aab2 DG |
2397 | if (regp) { |
2398 | *regp = reg_chan; | |
3d8ca23b | 2399 | } |
d88aee68 | 2400 | |
7972aab2 | 2401 | return 0; |
3d8ca23b DG |
2402 | |
2403 | error: | |
7972aab2 DG |
2404 | /* Safe because the registry channel object was not added to any HT. */ |
2405 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2406 | error_create: | |
3d8ca23b | 2407 | return ret; |
421cb601 DG |
2408 | } |
2409 | ||
55cc08a6 | 2410 | /* |
7972aab2 DG |
2411 | * Setup buffer registry channel for the given session registry and application |
2412 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2413 | * |
7972aab2 | 2414 | * Return 0 on success else a negative value. |
55cc08a6 | 2415 | */ |
7972aab2 DG |
2416 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
2417 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan) | |
55cc08a6 | 2418 | { |
7972aab2 | 2419 | int ret; |
55cc08a6 | 2420 | |
7972aab2 DG |
2421 | assert(reg_sess); |
2422 | assert(reg_chan); | |
2423 | assert(ua_chan); | |
2424 | assert(ua_chan->obj); | |
55cc08a6 | 2425 | |
7972aab2 | 2426 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2427 | |
7972aab2 DG |
2428 | /* Setup all streams for the registry. */ |
2429 | ret = setup_buffer_reg_streams(reg_chan, ua_chan); | |
2430 | if (ret < 0) { | |
55cc08a6 DG |
2431 | goto error; |
2432 | } | |
2433 | ||
7972aab2 DG |
2434 | reg_chan->obj.ust = ua_chan->obj; |
2435 | ua_chan->obj = NULL; | |
55cc08a6 | 2436 | |
7972aab2 | 2437 | return 0; |
55cc08a6 DG |
2438 | |
2439 | error: | |
7972aab2 DG |
2440 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2441 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2442 | return ret; |
2443 | } | |
2444 | ||
edb67388 | 2445 | /* |
7972aab2 | 2446 | * Send buffer registry channel to the application. |
d0b96690 | 2447 | * |
7972aab2 | 2448 | * Return 0 on success else a negative value. |
edb67388 | 2449 | */ |
7972aab2 DG |
2450 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2451 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2452 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2453 | { |
2454 | int ret; | |
7972aab2 | 2455 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2456 | |
7972aab2 DG |
2457 | assert(reg_chan); |
2458 | assert(app); | |
2459 | assert(ua_sess); | |
2460 | assert(ua_chan); | |
2461 | ||
2462 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2463 | ||
2464 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2465 | if (ret < 0) { |
2466 | goto error; | |
2467 | } | |
2468 | ||
7972aab2 DG |
2469 | /* Send channel to the application. */ |
2470 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
2471 | if (ret < 0) { | |
2472 | goto error; | |
2473 | } | |
2474 | ||
2475 | health_code_update(); | |
2476 | ||
2477 | /* Send all streams to application. */ | |
2478 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2479 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2480 | struct ust_app_stream stream; | |
2481 | ||
2482 | ret = duplicate_stream_object(reg_stream, &stream); | |
2483 | if (ret < 0) { | |
2484 | goto error_stream_unlock; | |
2485 | } | |
2486 | ||
2487 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2488 | if (ret < 0) { | |
8c067051 | 2489 | (void) release_ust_app_stream(-1, &stream); |
7972aab2 DG |
2490 | goto error_stream_unlock; |
2491 | } | |
edb67388 | 2492 | |
7972aab2 DG |
2493 | /* |
2494 | * The return value is not important here. This function will output an | |
2495 | * error if needed. | |
2496 | */ | |
2497 | (void) release_ust_app_stream(-1, &stream); | |
2498 | } | |
2499 | ua_chan->is_sent = 1; | |
2500 | ||
2501 | error_stream_unlock: | |
2502 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2503 | error: |
2504 | return ret; | |
2505 | } | |
2506 | ||
9730260e | 2507 | /* |
7972aab2 DG |
2508 | * Create and send to the application the created buffers with per UID buffers. |
2509 | * | |
2510 | * Return 0 on success else a negative value. | |
9730260e | 2511 | */ |
7972aab2 DG |
2512 | static int create_channel_per_uid(struct ust_app *app, |
2513 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2514 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2515 | { |
2516 | int ret; | |
7972aab2 DG |
2517 | struct buffer_reg_uid *reg_uid; |
2518 | struct buffer_reg_channel *reg_chan; | |
9730260e | 2519 | |
7972aab2 DG |
2520 | assert(app); |
2521 | assert(usess); | |
2522 | assert(ua_sess); | |
2523 | assert(ua_chan); | |
2524 | ||
2525 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2526 | ||
2527 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2528 | /* | |
2529 | * The session creation handles the creation of this global registry | |
2530 | * object. If none can be find, there is a code flow problem or a | |
2531 | * teardown race. | |
2532 | */ | |
2533 | assert(reg_uid); | |
2534 | ||
2535 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2536 | reg_uid); | |
2537 | if (!reg_chan) { | |
2538 | /* Create the buffer registry channel object. */ | |
2539 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2540 | if (ret < 0) { | |
f14256d6 MD |
2541 | ERR("Error creating the UST channel \"%s\" registry instance", |
2542 | ua_chan->name); | |
7972aab2 DG |
2543 | goto error; |
2544 | } | |
2545 | assert(reg_chan); | |
2546 | ||
2547 | /* | |
2548 | * Create the buffers on the consumer side. This call populates the | |
2549 | * ust app channel object with all streams and data object. | |
2550 | */ | |
2551 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2552 | app->bits_per_long, reg_uid->registry->reg.ust); | |
2553 | if (ret < 0) { | |
f14256d6 MD |
2554 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
2555 | ua_chan->name); | |
2556 | ||
07d2ae95 DG |
2557 | /* |
2558 | * Let's remove the previously created buffer registry channel so | |
2559 | * it's not visible anymore in the session registry. | |
2560 | */ | |
2561 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, | |
2562 | ua_chan->tracing_channel_id); | |
2563 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
2564 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
7972aab2 DG |
2565 | goto error; |
2566 | } | |
2567 | ||
2568 | /* | |
2569 | * Setup the streams and add it to the session registry. | |
2570 | */ | |
2571 | ret = setup_buffer_reg_channel(reg_uid->registry, ua_chan, reg_chan); | |
2572 | if (ret < 0) { | |
f14256d6 MD |
2573 | ERR("Error setting up UST channel \"%s\"", |
2574 | ua_chan->name); | |
7972aab2 DG |
2575 | goto error; |
2576 | } | |
2577 | ||
2578 | } | |
2579 | ||
2580 | /* Send buffers to the application. */ | |
2581 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
9730260e | 2582 | if (ret < 0) { |
f14256d6 MD |
2583 | /* |
2584 | * Don't report error to the console, since it may be | |
2585 | * caused by application concurrently exiting. | |
2586 | */ | |
9730260e DG |
2587 | goto error; |
2588 | } | |
2589 | ||
9730260e DG |
2590 | error: |
2591 | return ret; | |
2592 | } | |
2593 | ||
78f0bacd | 2594 | /* |
7972aab2 DG |
2595 | * Create and send to the application the created buffers with per PID buffers. |
2596 | * | |
2597 | * Return 0 on success else a negative value. | |
78f0bacd | 2598 | */ |
7972aab2 DG |
2599 | static int create_channel_per_pid(struct ust_app *app, |
2600 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2601 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2602 | { |
8535a6d9 | 2603 | int ret; |
7972aab2 | 2604 | struct ust_registry_session *registry; |
78f0bacd | 2605 | |
7972aab2 DG |
2606 | assert(app); |
2607 | assert(usess); | |
2608 | assert(ua_sess); | |
2609 | assert(ua_chan); | |
2610 | ||
2611 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2612 | ||
2613 | rcu_read_lock(); | |
2614 | ||
2615 | registry = get_session_registry(ua_sess); | |
2616 | assert(registry); | |
2617 | ||
2618 | /* Create and add a new channel registry to session. */ | |
2619 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd | 2620 | if (ret < 0) { |
f14256d6 MD |
2621 | ERR("Error creating the UST channel \"%s\" registry instance", |
2622 | ua_chan->name); | |
78f0bacd DG |
2623 | goto error; |
2624 | } | |
2625 | ||
7972aab2 DG |
2626 | /* Create and get channel on the consumer side. */ |
2627 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2628 | app->bits_per_long, registry); | |
2629 | if (ret < 0) { | |
f14256d6 MD |
2630 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
2631 | ua_chan->name); | |
7972aab2 DG |
2632 | goto error; |
2633 | } | |
2634 | ||
2635 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
2636 | if (ret < 0) { | |
f14256d6 MD |
2637 | /* |
2638 | * Don't report error to the console, since it may be | |
2639 | * caused by application concurrently exiting. | |
2640 | */ | |
7972aab2 DG |
2641 | goto error; |
2642 | } | |
8535a6d9 | 2643 | |
78f0bacd | 2644 | error: |
7972aab2 | 2645 | rcu_read_unlock(); |
78f0bacd DG |
2646 | return ret; |
2647 | } | |
2648 | ||
2649 | /* | |
7972aab2 DG |
2650 | * From an already allocated ust app channel, create the channel buffers if |
2651 | * need and send it to the application. This MUST be called with a RCU read | |
2652 | * side lock acquired. | |
2653 | * | |
2654 | * Return 0 on success or else a negative value. | |
78f0bacd | 2655 | */ |
7972aab2 DG |
2656 | static int do_create_channel(struct ust_app *app, |
2657 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2658 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2659 | { |
7972aab2 | 2660 | int ret; |
78f0bacd | 2661 | |
7972aab2 DG |
2662 | assert(app); |
2663 | assert(usess); | |
2664 | assert(ua_sess); | |
2665 | assert(ua_chan); | |
2666 | ||
2667 | /* Handle buffer type before sending the channel to the application. */ | |
2668 | switch (usess->buffer_type) { | |
2669 | case LTTNG_BUFFER_PER_UID: | |
2670 | { | |
2671 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
2672 | if (ret < 0) { | |
2673 | goto error; | |
2674 | } | |
2675 | break; | |
2676 | } | |
2677 | case LTTNG_BUFFER_PER_PID: | |
2678 | { | |
2679 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
2680 | if (ret < 0) { | |
2681 | goto error; | |
2682 | } | |
2683 | break; | |
2684 | } | |
2685 | default: | |
2686 | assert(0); | |
2687 | ret = -EINVAL; | |
78f0bacd DG |
2688 | goto error; |
2689 | } | |
2690 | ||
7972aab2 DG |
2691 | /* Initialize ust objd object using the received handle and add it. */ |
2692 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
2693 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 2694 | |
7972aab2 DG |
2695 | /* If channel is not enabled, disable it on the tracer */ |
2696 | if (!ua_chan->enabled) { | |
2697 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2698 | if (ret < 0) { | |
2699 | goto error; | |
2700 | } | |
78f0bacd DG |
2701 | } |
2702 | ||
2703 | error: | |
2704 | return ret; | |
2705 | } | |
2706 | ||
284d8f55 | 2707 | /* |
4d710ac2 DG |
2708 | * Create UST app channel and create it on the tracer. Set ua_chanp of the |
2709 | * newly created channel if not NULL. | |
d0b96690 | 2710 | * |
36b588ed | 2711 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 DG |
2712 | * |
2713 | * Return 0 on success or else a negative value. | |
284d8f55 | 2714 | */ |
4d710ac2 DG |
2715 | static int create_ust_app_channel(struct ust_app_session *ua_sess, |
2716 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
7972aab2 | 2717 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 2718 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
2719 | { |
2720 | int ret = 0; | |
bec39940 DG |
2721 | struct lttng_ht_iter iter; |
2722 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
2723 | struct ust_app_channel *ua_chan; |
2724 | ||
2725 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
2726 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
2727 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 2728 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 2729 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 2730 | goto end; |
5b4a0ec0 DG |
2731 | } |
2732 | ||
d0b96690 | 2733 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
2734 | if (ua_chan == NULL) { |
2735 | /* Only malloc can fail here */ | |
4d710ac2 | 2736 | ret = -ENOMEM; |
094d1690 | 2737 | goto error_alloc; |
fc34caaa DG |
2738 | } |
2739 | shadow_copy_channel(ua_chan, uchan); | |
2740 | ||
ffe60014 DG |
2741 | /* Set channel type. */ |
2742 | ua_chan->attr.type = type; | |
2743 | ||
7972aab2 | 2744 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
5b4a0ec0 DG |
2745 | if (ret < 0) { |
2746 | goto error; | |
2747 | } | |
2748 | ||
fc34caaa | 2749 | DBG2("UST app create channel %s for PID %d completed", ua_chan->name, |
852d0037 | 2750 | app->pid); |
fc34caaa | 2751 | |
d0b96690 DG |
2752 | /* Only add the channel if successful on the tracer side. */ |
2753 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
2754 | ||
fc34caaa | 2755 | end: |
4d710ac2 DG |
2756 | if (ua_chanp) { |
2757 | *ua_chanp = ua_chan; | |
2758 | } | |
2759 | ||
2760 | /* Everything went well. */ | |
2761 | return 0; | |
5b4a0ec0 DG |
2762 | |
2763 | error: | |
d0b96690 | 2764 | delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app); |
094d1690 | 2765 | error_alloc: |
4d710ac2 | 2766 | return ret; |
5b4a0ec0 DG |
2767 | } |
2768 | ||
2769 | /* | |
2770 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
2771 | * |
2772 | * Called with ust app session mutex held. | |
5b4a0ec0 | 2773 | */ |
edb67388 DG |
2774 | static |
2775 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
2776 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
2777 | struct ust_app *app) | |
284d8f55 | 2778 | { |
edb67388 | 2779 | int ret = 0; |
5b4a0ec0 | 2780 | struct ust_app_event *ua_event; |
284d8f55 | 2781 | |
5b4a0ec0 | 2782 | /* Get event node */ |
18eace3b | 2783 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 2784 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 2785 | if (ua_event != NULL) { |
fc34caaa | 2786 | ret = -EEXIST; |
edb67388 DG |
2787 | goto end; |
2788 | } | |
5b4a0ec0 | 2789 | |
edb67388 DG |
2790 | /* Does not exist so create one */ |
2791 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); | |
2792 | if (ua_event == NULL) { | |
2793 | /* Only malloc can failed so something is really wrong */ | |
2794 | ret = -ENOMEM; | |
fc34caaa | 2795 | goto end; |
5b4a0ec0 | 2796 | } |
edb67388 | 2797 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 2798 | |
edb67388 | 2799 | /* Create it on the tracer side */ |
5b4a0ec0 | 2800 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 2801 | if (ret < 0) { |
fc34caaa | 2802 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 2803 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
2804 | goto error; |
2805 | } | |
2806 | ||
d0b96690 | 2807 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 2808 | |
fc34caaa | 2809 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 2810 | app->pid); |
7f79d3a1 | 2811 | |
edb67388 | 2812 | end: |
fc34caaa DG |
2813 | return ret; |
2814 | ||
5b4a0ec0 | 2815 | error: |
fc34caaa DG |
2816 | /* Valid. Calling here is already in a read side lock */ |
2817 | delete_ust_app_event(-1, ua_event); | |
edb67388 | 2818 | return ret; |
5b4a0ec0 DG |
2819 | } |
2820 | ||
2821 | /* | |
2822 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 2823 | * |
7972aab2 | 2824 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
2825 | */ |
2826 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
ad7a9107 | 2827 | struct ust_app *app, struct consumer_output *consumer) |
5b4a0ec0 DG |
2828 | { |
2829 | int ret = 0; | |
ffe60014 | 2830 | struct ust_app_channel *metadata; |
d88aee68 | 2831 | struct consumer_socket *socket; |
7972aab2 | 2832 | struct ust_registry_session *registry; |
5b4a0ec0 | 2833 | |
ffe60014 DG |
2834 | assert(ua_sess); |
2835 | assert(app); | |
d88aee68 | 2836 | assert(consumer); |
5b4a0ec0 | 2837 | |
7972aab2 DG |
2838 | registry = get_session_registry(ua_sess); |
2839 | assert(registry); | |
2840 | ||
1b532a60 DG |
2841 | /* Metadata already exists for this registry or it was closed previously */ |
2842 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
2843 | ret = 0; |
2844 | goto error; | |
5b4a0ec0 DG |
2845 | } |
2846 | ||
ffe60014 | 2847 | /* Allocate UST metadata */ |
d0b96690 | 2848 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
2849 | if (!metadata) { |
2850 | /* malloc() failed */ | |
2851 | ret = -ENOMEM; | |
2852 | goto error; | |
2853 | } | |
5b4a0ec0 | 2854 | |
ad7a9107 | 2855 | memcpy(&metadata->attr, &ua_sess->metadata_attr, sizeof(metadata->attr)); |
5b4a0ec0 | 2856 | |
7972aab2 DG |
2857 | /* Need one fd for the channel. */ |
2858 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2859 | if (ret < 0) { | |
2860 | ERR("Exhausted number of available FD upon create metadata"); | |
2861 | goto error; | |
2862 | } | |
2863 | ||
4dc3dfc5 DG |
2864 | /* Get the right consumer socket for the application. */ |
2865 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
2866 | if (!socket) { | |
2867 | ret = -EINVAL; | |
2868 | goto error_consumer; | |
2869 | } | |
2870 | ||
331744e3 JD |
2871 | /* |
2872 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
2873 | * to the registry *before* we ask the consumer so we avoid the race of the | |
2874 | * consumer requesting the metadata and the ask_channel call on our side | |
2875 | * did not returned yet. | |
2876 | */ | |
2877 | registry->metadata_key = metadata->key; | |
2878 | ||
d88aee68 DG |
2879 | /* |
2880 | * Ask the metadata channel creation to the consumer. The metadata object | |
2881 | * will be created by the consumer and kept their. However, the stream is | |
2882 | * never added or monitored until we do a first push metadata to the | |
2883 | * consumer. | |
2884 | */ | |
7972aab2 DG |
2885 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
2886 | registry); | |
d88aee68 | 2887 | if (ret < 0) { |
f2a444f1 DG |
2888 | /* Nullify the metadata key so we don't try to close it later on. */ |
2889 | registry->metadata_key = 0; | |
d88aee68 DG |
2890 | goto error_consumer; |
2891 | } | |
2892 | ||
2893 | /* | |
2894 | * The setup command will make the metadata stream be sent to the relayd, | |
2895 | * if applicable, and the thread managing the metadatas. This is important | |
2896 | * because after this point, if an error occurs, the only way the stream | |
2897 | * can be deleted is to be monitored in the consumer. | |
2898 | */ | |
7972aab2 | 2899 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 2900 | if (ret < 0) { |
f2a444f1 DG |
2901 | /* Nullify the metadata key so we don't try to close it later on. */ |
2902 | registry->metadata_key = 0; | |
d88aee68 | 2903 | goto error_consumer; |
5b4a0ec0 DG |
2904 | } |
2905 | ||
7972aab2 DG |
2906 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
2907 | metadata->key, app->pid); | |
5b4a0ec0 | 2908 | |
d88aee68 | 2909 | error_consumer: |
b80f0b6c | 2910 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 2911 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 2912 | error: |
ffe60014 | 2913 | return ret; |
5b4a0ec0 DG |
2914 | } |
2915 | ||
5b4a0ec0 | 2916 | /* |
d88aee68 DG |
2917 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
2918 | * acquired before calling this function. | |
5b4a0ec0 DG |
2919 | */ |
2920 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
2921 | { | |
d88aee68 | 2922 | struct ust_app *app = NULL; |
bec39940 DG |
2923 | struct lttng_ht_node_ulong *node; |
2924 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 2925 | |
bec39940 DG |
2926 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
2927 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
2928 | if (node == NULL) { |
2929 | DBG2("UST app no found with pid %d", pid); | |
2930 | goto error; | |
2931 | } | |
5b4a0ec0 DG |
2932 | |
2933 | DBG2("Found UST app by pid %d", pid); | |
2934 | ||
d88aee68 | 2935 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
2936 | |
2937 | error: | |
d88aee68 | 2938 | return app; |
5b4a0ec0 DG |
2939 | } |
2940 | ||
d88aee68 DG |
2941 | /* |
2942 | * Allocate and init an UST app object using the registration information and | |
2943 | * the command socket. This is called when the command socket connects to the | |
2944 | * session daemon. | |
2945 | * | |
2946 | * The object is returned on success or else NULL. | |
2947 | */ | |
d0b96690 | 2948 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 2949 | { |
d0b96690 DG |
2950 | struct ust_app *lta = NULL; |
2951 | ||
2952 | assert(msg); | |
2953 | assert(sock >= 0); | |
2954 | ||
2955 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 2956 | |
173af62f DG |
2957 | if ((msg->bits_per_long == 64 && |
2958 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
2959 | || (msg->bits_per_long == 32 && | |
2960 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 2961 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
2962 | "%d-bit long, but no consumerd for this size is available.\n", |
2963 | msg->name, msg->pid, msg->bits_per_long); | |
2964 | goto error; | |
3f2c5fcc | 2965 | } |
d0b96690 | 2966 | |
5b4a0ec0 DG |
2967 | lta = zmalloc(sizeof(struct ust_app)); |
2968 | if (lta == NULL) { | |
2969 | PERROR("malloc"); | |
d0b96690 | 2970 | goto error; |
5b4a0ec0 DG |
2971 | } |
2972 | ||
2973 | lta->ppid = msg->ppid; | |
2974 | lta->uid = msg->uid; | |
2975 | lta->gid = msg->gid; | |
d0b96690 | 2976 | |
7753dea8 | 2977 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
2978 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
2979 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
2980 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
2981 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
2982 | lta->long_alignment = msg->long_alignment; | |
2983 | lta->byte_order = msg->byte_order; | |
2984 | ||
5b4a0ec0 DG |
2985 | lta->v_major = msg->major; |
2986 | lta->v_minor = msg->minor; | |
d9bf3ca4 | 2987 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 DG |
2988 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
2989 | lta->notify_sock = -1; | |
d88aee68 DG |
2990 | |
2991 | /* Copy name and make sure it's NULL terminated. */ | |
2992 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
2993 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
2994 | ||
2995 | /* | |
2996 | * Before this can be called, when receiving the registration information, | |
2997 | * the application compatibility is checked. So, at this point, the | |
2998 | * application can work with this session daemon. | |
2999 | */ | |
d0b96690 | 3000 | lta->compatible = 1; |
5b4a0ec0 | 3001 | |
852d0037 | 3002 | lta->pid = msg->pid; |
d0b96690 | 3003 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 3004 | lta->sock = sock; |
d0b96690 | 3005 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 3006 | |
d42f20df DG |
3007 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
3008 | ||
d0b96690 DG |
3009 | error: |
3010 | return lta; | |
3011 | } | |
3012 | ||
d88aee68 DG |
3013 | /* |
3014 | * For a given application object, add it to every hash table. | |
3015 | */ | |
d0b96690 DG |
3016 | void ust_app_add(struct ust_app *app) |
3017 | { | |
3018 | assert(app); | |
3019 | assert(app->notify_sock >= 0); | |
3020 | ||
5b4a0ec0 | 3021 | rcu_read_lock(); |
852d0037 DG |
3022 | |
3023 | /* | |
3024 | * On a re-registration, we want to kick out the previous registration of | |
3025 | * that pid | |
3026 | */ | |
d0b96690 | 3027 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
3028 | |
3029 | /* | |
3030 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
3031 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
3032 | * already in the table. | |
3033 | */ | |
d0b96690 | 3034 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 3035 | |
d0b96690 DG |
3036 | /* Add application to the notify socket hash table. */ |
3037 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
3038 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 3039 | |
d0b96690 | 3040 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
3041 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
3042 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
3043 | app->v_minor); | |
5b4a0ec0 | 3044 | |
d0b96690 DG |
3045 | rcu_read_unlock(); |
3046 | } | |
3047 | ||
d88aee68 DG |
3048 | /* |
3049 | * Set the application version into the object. | |
3050 | * | |
3051 | * Return 0 on success else a negative value either an errno code or a | |
3052 | * LTTng-UST error code. | |
3053 | */ | |
d0b96690 DG |
3054 | int ust_app_version(struct ust_app *app) |
3055 | { | |
d88aee68 DG |
3056 | int ret; |
3057 | ||
d0b96690 | 3058 | assert(app); |
d88aee68 DG |
3059 | |
3060 | ret = ustctl_tracer_version(app->sock, &app->version); | |
3061 | if (ret < 0) { | |
3062 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
5368d366 | 3063 | ERR("UST app %d version failed with ret %d", app->sock, ret); |
d88aee68 | 3064 | } else { |
5368d366 | 3065 | DBG3("UST app %d version failed. Application is dead", app->sock); |
d88aee68 DG |
3066 | } |
3067 | } | |
3068 | ||
3069 | return ret; | |
5b4a0ec0 DG |
3070 | } |
3071 | ||
3072 | /* | |
3073 | * Unregister app by removing it from the global traceable app list and freeing | |
3074 | * the data struct. | |
3075 | * | |
3076 | * The socket is already closed at this point so no close to sock. | |
3077 | */ | |
3078 | void ust_app_unregister(int sock) | |
3079 | { | |
3080 | struct ust_app *lta; | |
bec39940 DG |
3081 | struct lttng_ht_node_ulong *node; |
3082 | struct lttng_ht_iter iter; | |
d42f20df | 3083 | struct ust_app_session *ua_sess; |
525b0740 | 3084 | int ret; |
5b4a0ec0 DG |
3085 | |
3086 | rcu_read_lock(); | |
886459c6 | 3087 | |
5b4a0ec0 | 3088 | /* Get the node reference for a call_rcu */ |
852d0037 | 3089 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 3090 | node = lttng_ht_iter_get_node_ulong(&iter); |
d0b96690 | 3091 | assert(node); |
284d8f55 | 3092 | |
852d0037 | 3093 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
3094 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
3095 | ||
886459c6 | 3096 | /* Remove application from PID hash table */ |
852d0037 DG |
3097 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
3098 | assert(!ret); | |
3099 | ||
d88aee68 DG |
3100 | /* |
3101 | * Remove application from notify hash table. The thread handling the | |
3102 | * notify socket could have deleted the node so ignore on error because | |
3103 | * either way it's valid. The close of that socket is handled by the other | |
3104 | * thread. | |
3105 | */ | |
d0b96690 | 3106 | iter.iter.node = <a->notify_sock_n.node; |
d88aee68 | 3107 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); |
852d0037 | 3108 | |
5b98a774 DG |
3109 | /* |
3110 | * Ignore return value since the node might have been removed before by an | |
3111 | * add replace during app registration because the PID can be reassigned by | |
3112 | * the OS. | |
3113 | */ | |
d0b96690 | 3114 | iter.iter.node = <a->pid_n.node; |
bec39940 | 3115 | ret = lttng_ht_del(ust_app_ht, &iter); |
5b98a774 DG |
3116 | if (ret) { |
3117 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
3118 | lta->pid); | |
3119 | } | |
852d0037 | 3120 | |
d42f20df DG |
3121 | /* Remove sessions so they are not visible during deletion.*/ |
3122 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, | |
3123 | node.node) { | |
7972aab2 DG |
3124 | struct ust_registry_session *registry; |
3125 | ||
d42f20df DG |
3126 | ret = lttng_ht_del(lta->sessions, &iter); |
3127 | if (ret) { | |
3128 | /* The session was already removed so scheduled for teardown. */ | |
3129 | continue; | |
3130 | } | |
3131 | ||
3132 | /* | |
3133 | * Add session to list for teardown. This is safe since at this point we | |
3134 | * are the only one using this list. | |
3135 | */ | |
d88aee68 DG |
3136 | pthread_mutex_lock(&ua_sess->lock); |
3137 | ||
3138 | /* | |
3139 | * Normally, this is done in the delete session process which is | |
3140 | * executed in the call rcu below. However, upon registration we can't | |
3141 | * afford to wait for the grace period before pushing data or else the | |
3142 | * data pending feature can race between the unregistration and stop | |
3143 | * command where the data pending command is sent *before* the grace | |
3144 | * period ended. | |
3145 | * | |
3146 | * The close metadata below nullifies the metadata pointer in the | |
3147 | * session so the delete session will NOT push/close a second time. | |
3148 | */ | |
7972aab2 | 3149 | registry = get_session_registry(ua_sess); |
1b532a60 | 3150 | if (registry && !registry->metadata_closed) { |
7972aab2 DG |
3151 | /* Push metadata for application before freeing the application. */ |
3152 | (void) push_metadata(registry, ua_sess->consumer); | |
3153 | ||
3154 | /* | |
3155 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
3156 | * metadata only on destroy trace session in this case. Also, the |
3157 | * previous push metadata could have flag the metadata registry to | |
3158 | * close so don't send a close command if closed. | |
7972aab2 | 3159 | */ |
1b532a60 DG |
3160 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID && |
3161 | !registry->metadata_closed) { | |
7972aab2 DG |
3162 | /* And ask to close it for this session registry. */ |
3163 | (void) close_metadata(registry, ua_sess->consumer); | |
3164 | } | |
3165 | } | |
d88aee68 | 3166 | |
d42f20df | 3167 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
d88aee68 | 3168 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
3169 | } |
3170 | ||
852d0037 DG |
3171 | /* Free memory */ |
3172 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
3173 | ||
5b4a0ec0 DG |
3174 | rcu_read_unlock(); |
3175 | return; | |
284d8f55 DG |
3176 | } |
3177 | ||
5b4a0ec0 DG |
3178 | /* |
3179 | * Fill events array with all events name of all registered apps. | |
3180 | */ | |
3181 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 3182 | { |
5b4a0ec0 DG |
3183 | int ret, handle; |
3184 | size_t nbmem, count = 0; | |
bec39940 | 3185 | struct lttng_ht_iter iter; |
5b4a0ec0 | 3186 | struct ust_app *app; |
c617c0c6 | 3187 | struct lttng_event *tmp_event; |
421cb601 | 3188 | |
5b4a0ec0 | 3189 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
3190 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
3191 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
3192 | PERROR("zmalloc ust app events"); |
3193 | ret = -ENOMEM; | |
421cb601 DG |
3194 | goto error; |
3195 | } | |
3196 | ||
5b4a0ec0 | 3197 | rcu_read_lock(); |
421cb601 | 3198 | |
852d0037 | 3199 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 3200 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 3201 | |
840cb59c | 3202 | health_code_update(); |
86acf0da | 3203 | |
e0c7ec2b DG |
3204 | if (!app->compatible) { |
3205 | /* | |
3206 | * TODO: In time, we should notice the caller of this error by | |
3207 | * telling him that this is a version error. | |
3208 | */ | |
3209 | continue; | |
3210 | } | |
852d0037 | 3211 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 3212 | if (handle < 0) { |
ffe60014 DG |
3213 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3214 | ERR("UST app list events getting handle failed for app pid %d", | |
3215 | app->pid); | |
3216 | } | |
5b4a0ec0 DG |
3217 | continue; |
3218 | } | |
421cb601 | 3219 | |
852d0037 | 3220 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 3221 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3222 | /* Handle ustctl error. */ |
3223 | if (ret < 0) { | |
a2ba1ab0 | 3224 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3225 | ERR("UST app tp list get failed for app %d with ret %d", |
3226 | app->sock, ret); | |
3227 | } else { | |
3228 | DBG3("UST app tp list get failed. Application is dead"); | |
3757b385 DG |
3229 | /* |
3230 | * This is normal behavior, an application can die during the | |
3231 | * creation process. Don't report an error so the execution can | |
3232 | * continue normally. Continue normal execution. | |
3233 | */ | |
3234 | break; | |
ffe60014 | 3235 | } |
98f595d4 | 3236 | free(tmp_event); |
ffe60014 DG |
3237 | goto rcu_error; |
3238 | } | |
3239 | ||
840cb59c | 3240 | health_code_update(); |
815564d8 | 3241 | if (count >= nbmem) { |
d7b3776f | 3242 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3243 | struct lttng_event *new_tmp_event; |
3244 | size_t new_nbmem; | |
3245 | ||
3246 | new_nbmem = nbmem << 1; | |
3247 | DBG2("Reallocating event list from %zu to %zu entries", | |
3248 | nbmem, new_nbmem); | |
3249 | new_tmp_event = realloc(tmp_event, | |
3250 | new_nbmem * sizeof(struct lttng_event)); | |
3251 | if (new_tmp_event == NULL) { | |
5b4a0ec0 | 3252 | PERROR("realloc ust app events"); |
c617c0c6 | 3253 | free(tmp_event); |
5b4a0ec0 DG |
3254 | ret = -ENOMEM; |
3255 | goto rcu_error; | |
3256 | } | |
53efb85a MD |
3257 | /* Zero the new memory */ |
3258 | memset(new_tmp_event + nbmem, 0, | |
3259 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
3260 | nbmem = new_nbmem; | |
3261 | tmp_event = new_tmp_event; | |
5b4a0ec0 | 3262 | } |
c617c0c6 MD |
3263 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
3264 | tmp_event[count].loglevel = uiter.loglevel; | |
3265 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
3266 | tmp_event[count].pid = app->pid; | |
3267 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 3268 | count++; |
421cb601 | 3269 | } |
421cb601 DG |
3270 | } |
3271 | ||
5b4a0ec0 | 3272 | ret = count; |
c617c0c6 | 3273 | *events = tmp_event; |
421cb601 | 3274 | |
5b4a0ec0 | 3275 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 3276 | |
5b4a0ec0 DG |
3277 | rcu_error: |
3278 | rcu_read_unlock(); | |
421cb601 | 3279 | error: |
840cb59c | 3280 | health_code_update(); |
5b4a0ec0 | 3281 | return ret; |
421cb601 DG |
3282 | } |
3283 | ||
f37d259d MD |
3284 | /* |
3285 | * Fill events array with all events name of all registered apps. | |
3286 | */ | |
3287 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
3288 | { | |
3289 | int ret, handle; | |
3290 | size_t nbmem, count = 0; | |
3291 | struct lttng_ht_iter iter; | |
3292 | struct ust_app *app; | |
c617c0c6 | 3293 | struct lttng_event_field *tmp_event; |
f37d259d MD |
3294 | |
3295 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
3296 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
3297 | if (tmp_event == NULL) { | |
f37d259d MD |
3298 | PERROR("zmalloc ust app event fields"); |
3299 | ret = -ENOMEM; | |
3300 | goto error; | |
3301 | } | |
3302 | ||
3303 | rcu_read_lock(); | |
3304 | ||
3305 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3306 | struct lttng_ust_field_iter uiter; | |
3307 | ||
840cb59c | 3308 | health_code_update(); |
86acf0da | 3309 | |
f37d259d MD |
3310 | if (!app->compatible) { |
3311 | /* | |
3312 | * TODO: In time, we should notice the caller of this error by | |
3313 | * telling him that this is a version error. | |
3314 | */ | |
3315 | continue; | |
3316 | } | |
3317 | handle = ustctl_tracepoint_field_list(app->sock); | |
3318 | if (handle < 0) { | |
ffe60014 DG |
3319 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3320 | ERR("UST app list field getting handle failed for app pid %d", | |
3321 | app->pid); | |
3322 | } | |
f37d259d MD |
3323 | continue; |
3324 | } | |
3325 | ||
3326 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 3327 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3328 | /* Handle ustctl error. */ |
3329 | if (ret < 0) { | |
a2ba1ab0 | 3330 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3331 | ERR("UST app tp list field failed for app %d with ret %d", |
3332 | app->sock, ret); | |
3333 | } else { | |
3334 | DBG3("UST app tp list field failed. Application is dead"); | |
3757b385 DG |
3335 | /* |
3336 | * This is normal behavior, an application can die during the | |
3337 | * creation process. Don't report an error so the execution can | |
98f595d4 | 3338 | * continue normally. Reset list and count for next app. |
3757b385 DG |
3339 | */ |
3340 | break; | |
ffe60014 | 3341 | } |
98f595d4 | 3342 | free(tmp_event); |
ffe60014 DG |
3343 | goto rcu_error; |
3344 | } | |
3345 | ||
840cb59c | 3346 | health_code_update(); |
f37d259d | 3347 | if (count >= nbmem) { |
d7b3776f | 3348 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3349 | struct lttng_event_field *new_tmp_event; |
3350 | size_t new_nbmem; | |
3351 | ||
3352 | new_nbmem = nbmem << 1; | |
3353 | DBG2("Reallocating event field list from %zu to %zu entries", | |
3354 | nbmem, new_nbmem); | |
3355 | new_tmp_event = realloc(tmp_event, | |
3356 | new_nbmem * sizeof(struct lttng_event_field)); | |
3357 | if (new_tmp_event == NULL) { | |
f37d259d | 3358 | PERROR("realloc ust app event fields"); |
c617c0c6 | 3359 | free(tmp_event); |
f37d259d MD |
3360 | ret = -ENOMEM; |
3361 | goto rcu_error; | |
3362 | } | |
53efb85a MD |
3363 | /* Zero the new memory */ |
3364 | memset(new_tmp_event + nbmem, 0, | |
3365 | (new_nbmem - nbmem) * sizeof(struct lttng_event_field)); | |
3366 | nbmem = new_nbmem; | |
3367 | tmp_event = new_tmp_event; | |
f37d259d | 3368 | } |
f37d259d | 3369 | |
c617c0c6 | 3370 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
2e84128e DG |
3371 | /* Mapping between these enums matches 1 to 1. */ |
3372 | tmp_event[count].type = (enum lttng_event_field_type) uiter.type; | |
c617c0c6 | 3373 | tmp_event[count].nowrite = uiter.nowrite; |
f37d259d | 3374 | |
c617c0c6 MD |
3375 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
3376 | tmp_event[count].event.loglevel = uiter.loglevel; | |
2e84128e | 3377 | tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; |
c617c0c6 MD |
3378 | tmp_event[count].event.pid = app->pid; |
3379 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
3380 | count++; |
3381 | } | |
3382 | } | |
3383 | ||
3384 | ret = count; | |
c617c0c6 | 3385 | *fields = tmp_event; |
f37d259d MD |
3386 | |
3387 | DBG2("UST app list event fields done (%zu events)", count); | |
3388 | ||
3389 | rcu_error: | |
3390 | rcu_read_unlock(); | |
3391 | error: | |
840cb59c | 3392 | health_code_update(); |
f37d259d MD |
3393 | return ret; |
3394 | } | |
3395 | ||
5b4a0ec0 DG |
3396 | /* |
3397 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
3398 | * |
3399 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
3400 | */ |
3401 | void ust_app_clean_list(void) | |
421cb601 | 3402 | { |
5b4a0ec0 | 3403 | int ret; |
659ed79f | 3404 | struct ust_app *app; |
bec39940 | 3405 | struct lttng_ht_iter iter; |
421cb601 | 3406 | |
5b4a0ec0 | 3407 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3408 | |
5b4a0ec0 | 3409 | rcu_read_lock(); |
421cb601 | 3410 | |
f1b711c4 MD |
3411 | if (ust_app_ht) { |
3412 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3413 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3414 | assert(!ret); | |
3415 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
3416 | } | |
421cb601 DG |
3417 | } |
3418 | ||
852d0037 | 3419 | /* Cleanup socket hash table */ |
f1b711c4 MD |
3420 | if (ust_app_ht_by_sock) { |
3421 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, | |
3422 | sock_n.node) { | |
3423 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); | |
3424 | assert(!ret); | |
3425 | } | |
bec39940 | 3426 | } |
852d0037 | 3427 | |
d88aee68 | 3428 | /* Cleanup notify socket hash table */ |
f1b711c4 MD |
3429 | if (ust_app_ht_by_notify_sock) { |
3430 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3431 | notify_sock_n.node) { | |
3432 | ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3433 | assert(!ret); | |
3434 | } | |
d88aee68 | 3435 | } |
36b588ed | 3436 | rcu_read_unlock(); |
d88aee68 | 3437 | |
bec39940 | 3438 | /* Destroy is done only when the ht is empty */ |
f1b711c4 MD |
3439 | if (ust_app_ht) { |
3440 | ht_cleanup_push(ust_app_ht); | |
3441 | } | |
3442 | if (ust_app_ht_by_sock) { | |
3443 | ht_cleanup_push(ust_app_ht_by_sock); | |
3444 | } | |
3445 | if (ust_app_ht_by_notify_sock) { | |
3446 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
3447 | } | |
5b4a0ec0 DG |
3448 | } |
3449 | ||
3450 | /* | |
3451 | * Init UST app hash table. | |
3452 | */ | |
57703f6e | 3453 | int ust_app_ht_alloc(void) |
5b4a0ec0 | 3454 | { |
bec39940 | 3455 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3456 | if (!ust_app_ht) { |
3457 | return -1; | |
3458 | } | |
852d0037 | 3459 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3460 | if (!ust_app_ht_by_sock) { |
3461 | return -1; | |
3462 | } | |
d0b96690 | 3463 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3464 | if (!ust_app_ht_by_notify_sock) { |
3465 | return -1; | |
3466 | } | |
3467 | return 0; | |
421cb601 DG |
3468 | } |
3469 | ||
78f0bacd DG |
3470 | /* |
3471 | * For a specific UST session, disable the channel for all registered apps. | |
3472 | */ | |
35a9059d | 3473 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3474 | struct ltt_ust_channel *uchan) |
3475 | { | |
3476 | int ret = 0; | |
bec39940 DG |
3477 | struct lttng_ht_iter iter; |
3478 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3479 | struct ust_app *app; |
3480 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3481 | struct ust_app_channel *ua_chan; |
78f0bacd DG |
3482 | |
3483 | if (usess == NULL || uchan == NULL) { | |
3484 | ERR("Disabling UST global channel with NULL values"); | |
3485 | ret = -1; | |
3486 | goto error; | |
3487 | } | |
3488 | ||
d9bf3ca4 | 3489 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 3490 | uchan->name, usess->id); |
78f0bacd DG |
3491 | |
3492 | rcu_read_lock(); | |
3493 | ||
3494 | /* For every registered applications */ | |
852d0037 | 3495 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3496 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3497 | if (!app->compatible) { |
3498 | /* | |
3499 | * TODO: In time, we should notice the caller of this error by | |
3500 | * telling him that this is a version error. | |
3501 | */ | |
3502 | continue; | |
3503 | } | |
78f0bacd DG |
3504 | ua_sess = lookup_session_by_app(usess, app); |
3505 | if (ua_sess == NULL) { | |
3506 | continue; | |
3507 | } | |
3508 | ||
8535a6d9 | 3509 | /* Get channel */ |
bec39940 DG |
3510 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3511 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
3512 | /* If the session if found for the app, the channel must be there */ |
3513 | assert(ua_chan_node); | |
3514 | ||
3515 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3516 | /* The channel must not be already disabled */ | |
3517 | assert(ua_chan->enabled == 1); | |
3518 | ||
3519 | /* Disable channel onto application */ | |
3520 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
3521 | if (ret < 0) { |
3522 | /* XXX: We might want to report this error at some point... */ | |
3523 | continue; | |
3524 | } | |
3525 | } | |
3526 | ||
3527 | rcu_read_unlock(); | |
3528 | ||
3529 | error: | |
3530 | return ret; | |
3531 | } | |
3532 | ||
3533 | /* | |
3534 | * For a specific UST session, enable the channel for all registered apps. | |
3535 | */ | |
35a9059d | 3536 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3537 | struct ltt_ust_channel *uchan) |
3538 | { | |
3539 | int ret = 0; | |
bec39940 | 3540 | struct lttng_ht_iter iter; |
78f0bacd DG |
3541 | struct ust_app *app; |
3542 | struct ust_app_session *ua_sess; | |
3543 | ||
3544 | if (usess == NULL || uchan == NULL) { | |
3545 | ERR("Adding UST global channel to NULL values"); | |
3546 | ret = -1; | |
3547 | goto error; | |
3548 | } | |
3549 | ||
d9bf3ca4 | 3550 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 3551 | uchan->name, usess->id); |
78f0bacd DG |
3552 | |
3553 | rcu_read_lock(); | |
3554 | ||
3555 | /* For every registered applications */ | |
852d0037 | 3556 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3557 | if (!app->compatible) { |
3558 | /* | |
3559 | * TODO: In time, we should notice the caller of this error by | |
3560 | * telling him that this is a version error. | |
3561 | */ | |
3562 | continue; | |
3563 | } | |
78f0bacd DG |
3564 | ua_sess = lookup_session_by_app(usess, app); |
3565 | if (ua_sess == NULL) { | |
3566 | continue; | |
3567 | } | |
3568 | ||
3569 | /* Enable channel onto application */ | |
3570 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
3571 | if (ret < 0) { | |
3572 | /* XXX: We might want to report this error at some point... */ | |
3573 | continue; | |
3574 | } | |
3575 | } | |
3576 | ||
3577 | rcu_read_unlock(); | |
3578 | ||
3579 | error: | |
3580 | return ret; | |
3581 | } | |
3582 | ||
b0a40d28 DG |
3583 | /* |
3584 | * Disable an event in a channel and for a specific session. | |
3585 | */ | |
35a9059d DG |
3586 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
3587 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
3588 | { |
3589 | int ret = 0; | |
bec39940 DG |
3590 | struct lttng_ht_iter iter, uiter; |
3591 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
b0a40d28 DG |
3592 | struct ust_app *app; |
3593 | struct ust_app_session *ua_sess; | |
3594 | struct ust_app_channel *ua_chan; | |
3595 | struct ust_app_event *ua_event; | |
3596 | ||
3597 | DBG("UST app disabling event %s for all apps in channel " | |
d9bf3ca4 MD |
3598 | "%s for session id %" PRIu64, |
3599 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
3600 | |
3601 | rcu_read_lock(); | |
3602 | ||
3603 | /* For all registered applications */ | |
852d0037 | 3604 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3605 | if (!app->compatible) { |
3606 | /* | |
3607 | * TODO: In time, we should notice the caller of this error by | |
3608 | * telling him that this is a version error. | |
3609 | */ | |
3610 | continue; | |
3611 | } | |
b0a40d28 DG |
3612 | ua_sess = lookup_session_by_app(usess, app); |
3613 | if (ua_sess == NULL) { | |
3614 | /* Next app */ | |
3615 | continue; | |
3616 | } | |
3617 | ||
3618 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3619 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3620 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 3621 | if (ua_chan_node == NULL) { |
d9bf3ca4 | 3622 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 3623 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
3624 | continue; |
3625 | } | |
3626 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3627 | ||
bec39940 DG |
3628 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter); |
3629 | ua_event_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 DG |
3630 | if (ua_event_node == NULL) { |
3631 | DBG2("Event %s not found in channel %s for app pid %d." | |
852d0037 | 3632 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
3633 | continue; |
3634 | } | |
3635 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
3636 | ||
7f79d3a1 | 3637 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
3638 | if (ret < 0) { |
3639 | /* XXX: Report error someday... */ | |
3640 | continue; | |
3641 | } | |
3642 | } | |
3643 | ||
3644 | rcu_read_unlock(); | |
3645 | ||
3646 | return ret; | |
3647 | } | |
3648 | ||
421cb601 | 3649 | /* |
5b4a0ec0 | 3650 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 3651 | */ |
35a9059d | 3652 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3653 | struct ltt_ust_channel *uchan) |
3654 | { | |
3d8ca23b | 3655 | int ret = 0, created; |
bec39940 | 3656 | struct lttng_ht_iter iter; |
48842b30 | 3657 | struct ust_app *app; |
3d8ca23b | 3658 | struct ust_app_session *ua_sess = NULL; |
48842b30 | 3659 | |
fc34caaa DG |
3660 | /* Very wrong code flow */ |
3661 | assert(usess); | |
3662 | assert(uchan); | |
421cb601 | 3663 | |
d9bf3ca4 | 3664 | DBG2("UST app adding channel %s to UST domain for session id %" PRIu64, |
a991f516 | 3665 | uchan->name, usess->id); |
48842b30 DG |
3666 | |
3667 | rcu_read_lock(); | |
421cb601 | 3668 | |
5b4a0ec0 | 3669 | /* For every registered applications */ |
852d0037 | 3670 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3671 | if (!app->compatible) { |
3672 | /* | |
3673 | * TODO: In time, we should notice the caller of this error by | |
3674 | * telling him that this is a version error. | |
3675 | */ | |
3676 | continue; | |
3677 | } | |
edb67388 DG |
3678 | /* |
3679 | * Create session on the tracer side and add it to app session HT. Note | |
3680 | * that if session exist, it will simply return a pointer to the ust | |
3681 | * app session. | |
3682 | */ | |
3d8ca23b DG |
3683 | ret = create_ust_app_session(usess, app, &ua_sess, &created); |
3684 | if (ret < 0) { | |
3685 | switch (ret) { | |
3686 | case -ENOTCONN: | |
3687 | /* | |
3688 | * The application's socket is not valid. Either a bad socket | |
3689 | * or a timeout on it. We can't inform the caller that for a | |
3690 | * specific app, the session failed so lets continue here. | |
3691 | */ | |
3692 | continue; | |
3693 | case -ENOMEM: | |
3694 | default: | |
3695 | goto error_rcu_unlock; | |
3696 | } | |
48842b30 | 3697 | } |
3d8ca23b | 3698 | assert(ua_sess); |
48842b30 | 3699 | |
d0b96690 | 3700 | pthread_mutex_lock(&ua_sess->lock); |
d65d2de8 DG |
3701 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, |
3702 | sizeof(uchan->name))) { | |
ad7a9107 DG |
3703 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, &uchan->attr); |
3704 | ret = 0; | |
d65d2de8 DG |
3705 | } else { |
3706 | /* Create channel onto application. We don't need the chan ref. */ | |
3707 | ret = create_ust_app_channel(ua_sess, uchan, app, | |
3708 | LTTNG_UST_CHAN_PER_CPU, usess, NULL); | |
3709 | } | |
d0b96690 | 3710 | pthread_mutex_unlock(&ua_sess->lock); |
3d8ca23b DG |
3711 | if (ret < 0) { |
3712 | if (ret == -ENOMEM) { | |
3713 | /* No more memory is a fatal error. Stop right now. */ | |
3714 | goto error_rcu_unlock; | |
3715 | } | |
3716 | /* Cleanup the created session if it's the case. */ | |
3717 | if (created) { | |
d0b96690 | 3718 | destroy_app_session(app, ua_sess); |
3d8ca23b | 3719 | } |
48842b30 | 3720 | } |
48842b30 | 3721 | } |
5b4a0ec0 | 3722 | |
95e047ff | 3723 | error_rcu_unlock: |
48842b30 | 3724 | rcu_read_unlock(); |
3c14c33f | 3725 | return ret; |
48842b30 DG |
3726 | } |
3727 | ||
5b4a0ec0 | 3728 | /* |
edb67388 | 3729 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 3730 | */ |
35a9059d | 3731 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3732 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3733 | { | |
3734 | int ret = 0; | |
bec39940 | 3735 | struct lttng_ht_iter iter, uiter; |
18eace3b | 3736 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
3737 | struct ust_app *app; |
3738 | struct ust_app_session *ua_sess; | |
3739 | struct ust_app_channel *ua_chan; | |
3740 | struct ust_app_event *ua_event; | |
48842b30 | 3741 | |
d9bf3ca4 | 3742 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 3743 | uevent->attr.name, usess->id); |
48842b30 | 3744 | |
edb67388 DG |
3745 | /* |
3746 | * NOTE: At this point, this function is called only if the session and | |
3747 | * channel passed are already created for all apps. and enabled on the | |
3748 | * tracer also. | |
3749 | */ | |
3750 | ||
48842b30 | 3751 | rcu_read_lock(); |
421cb601 DG |
3752 | |
3753 | /* For all registered applications */ | |
852d0037 | 3754 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3755 | if (!app->compatible) { |
3756 | /* | |
3757 | * TODO: In time, we should notice the caller of this error by | |
3758 | * telling him that this is a version error. | |
3759 | */ | |
3760 | continue; | |
3761 | } | |
edb67388 | 3762 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3763 | if (!ua_sess) { |
3764 | /* The application has problem or is probably dead. */ | |
3765 | continue; | |
3766 | } | |
ba767faf | 3767 | |
d0b96690 DG |
3768 | pthread_mutex_lock(&ua_sess->lock); |
3769 | ||
edb67388 | 3770 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3771 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3772 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3773 | /* If the channel is not found, there is a code flow error */ |
3774 | assert(ua_chan_node); | |
3775 | ||
3776 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3777 | ||
18eace3b DG |
3778 | /* Get event node */ |
3779 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
39c5a3a7 | 3780 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 3781 | if (ua_event == NULL) { |
7f79d3a1 | 3782 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 3783 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 3784 | goto next_app; |
35a9059d | 3785 | } |
35a9059d DG |
3786 | |
3787 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
3788 | if (ret < 0) { | |
d0b96690 | 3789 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 3790 | goto error; |
48842b30 | 3791 | } |
d0b96690 DG |
3792 | next_app: |
3793 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
3794 | } |
3795 | ||
7f79d3a1 | 3796 | error: |
edb67388 | 3797 | rcu_read_unlock(); |
edb67388 DG |
3798 | return ret; |
3799 | } | |
3800 | ||
3801 | /* | |
3802 | * For a specific existing UST session and UST channel, creates the event for | |
3803 | * all registered apps. | |
3804 | */ | |
35a9059d | 3805 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
3806 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3807 | { | |
3808 | int ret = 0; | |
bec39940 DG |
3809 | struct lttng_ht_iter iter, uiter; |
3810 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
3811 | struct ust_app *app; |
3812 | struct ust_app_session *ua_sess; | |
3813 | struct ust_app_channel *ua_chan; | |
3814 | ||
d9bf3ca4 | 3815 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 3816 | uevent->attr.name, usess->id); |
edb67388 | 3817 | |
edb67388 DG |
3818 | rcu_read_lock(); |
3819 | ||
3820 | /* For all registered applications */ | |
852d0037 | 3821 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3822 | if (!app->compatible) { |
3823 | /* | |
3824 | * TODO: In time, we should notice the caller of this error by | |
3825 | * telling him that this is a version error. | |
3826 | */ | |
3827 | continue; | |
3828 | } | |
edb67388 | 3829 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3830 | if (!ua_sess) { |
3831 | /* The application has problem or is probably dead. */ | |
3832 | continue; | |
3833 | } | |
48842b30 | 3834 | |
d0b96690 | 3835 | pthread_mutex_lock(&ua_sess->lock); |
48842b30 | 3836 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3837 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3838 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3839 | /* If the channel is not found, there is a code flow error */ |
3840 | assert(ua_chan_node); | |
3841 | ||
48842b30 DG |
3842 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3843 | ||
edb67388 | 3844 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 3845 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 3846 | if (ret < 0) { |
49c336c1 | 3847 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
3848 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
3849 | break; | |
3850 | } | |
3851 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 3852 | uevent->attr.name, app->pid); |
5b4a0ec0 | 3853 | continue; |
48842b30 | 3854 | } |
48842b30 | 3855 | } |
5b4a0ec0 | 3856 | |
48842b30 DG |
3857 | rcu_read_unlock(); |
3858 | ||
3859 | return ret; | |
3860 | } | |
3861 | ||
5b4a0ec0 DG |
3862 | /* |
3863 | * Start tracing for a specific UST session and app. | |
3864 | */ | |
b34cbebf | 3865 | static |
421cb601 | 3866 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
3867 | { |
3868 | int ret = 0; | |
48842b30 | 3869 | struct ust_app_session *ua_sess; |
48842b30 | 3870 | |
852d0037 | 3871 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 3872 | |
509cbaf8 MD |
3873 | rcu_read_lock(); |
3874 | ||
e0c7ec2b DG |
3875 | if (!app->compatible) { |
3876 | goto end; | |
3877 | } | |
3878 | ||
421cb601 DG |
3879 | ua_sess = lookup_session_by_app(usess, app); |
3880 | if (ua_sess == NULL) { | |
d42f20df DG |
3881 | /* The session is in teardown process. Ignore and continue. */ |
3882 | goto end; | |
421cb601 | 3883 | } |
48842b30 | 3884 | |
d0b96690 DG |
3885 | pthread_mutex_lock(&ua_sess->lock); |
3886 | ||
aea829b3 DG |
3887 | /* Upon restart, we skip the setup, already done */ |
3888 | if (ua_sess->started) { | |
8be98f9a | 3889 | goto skip_setup; |
aea829b3 | 3890 | } |
8be98f9a | 3891 | |
a4b92340 DG |
3892 | /* Create directories if consumer is LOCAL and has a path defined. */ |
3893 | if (usess->consumer->type == CONSUMER_DST_LOCAL && | |
3894 | strlen(usess->consumer->dst.trace_path) > 0) { | |
3895 | ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path, | |
7972aab2 | 3896 | S_IRWXU | S_IRWXG, ua_sess->euid, ua_sess->egid); |
a4b92340 DG |
3897 | if (ret < 0) { |
3898 | if (ret != -EEXIST) { | |
3899 | ERR("Trace directory creation error"); | |
d0b96690 | 3900 | goto error_unlock; |
421cb601 | 3901 | } |
173af62f | 3902 | } |
7753dea8 | 3903 | } |
aea829b3 | 3904 | |
d65d2de8 DG |
3905 | /* |
3906 | * Create the metadata for the application. This returns gracefully if a | |
3907 | * metadata was already set for the session. | |
3908 | */ | |
ad7a9107 | 3909 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer); |
421cb601 | 3910 | if (ret < 0) { |
d0b96690 | 3911 | goto error_unlock; |
421cb601 | 3912 | } |
48842b30 | 3913 | |
840cb59c | 3914 | health_code_update(); |
86acf0da | 3915 | |
8be98f9a | 3916 | skip_setup: |
421cb601 | 3917 | /* This start the UST tracing */ |
852d0037 | 3918 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
421cb601 | 3919 | if (ret < 0) { |
ffe60014 DG |
3920 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3921 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
3922 | app->pid, ret); | |
3923 | } else { | |
3924 | DBG("UST app start session failed. Application is dead."); | |
3757b385 DG |
3925 | /* |
3926 | * This is normal behavior, an application can die during the | |
3927 | * creation process. Don't report an error so the execution can | |
3928 | * continue normally. | |
3929 | */ | |
3930 | pthread_mutex_unlock(&ua_sess->lock); | |
3931 | goto end; | |
ffe60014 | 3932 | } |
d0b96690 | 3933 | goto error_unlock; |
421cb601 | 3934 | } |
5b4a0ec0 | 3935 | |
55c3953d DG |
3936 | /* Indicate that the session has been started once */ |
3937 | ua_sess->started = 1; | |
3938 | ||
d0b96690 DG |
3939 | pthread_mutex_unlock(&ua_sess->lock); |
3940 | ||
840cb59c | 3941 | health_code_update(); |
86acf0da | 3942 | |
421cb601 | 3943 | /* Quiescent wait after starting trace */ |
ffe60014 DG |
3944 | ret = ustctl_wait_quiescent(app->sock); |
3945 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3946 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3947 | app->pid, ret); | |
3948 | } | |
48842b30 | 3949 | |
e0c7ec2b DG |
3950 | end: |
3951 | rcu_read_unlock(); | |
840cb59c | 3952 | health_code_update(); |
421cb601 | 3953 | return 0; |
48842b30 | 3954 | |
d0b96690 DG |
3955 | error_unlock: |
3956 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 3957 | rcu_read_unlock(); |
840cb59c | 3958 | health_code_update(); |
421cb601 DG |
3959 | return -1; |
3960 | } | |
48842b30 | 3961 | |
8be98f9a MD |
3962 | /* |
3963 | * Stop tracing for a specific UST session and app. | |
3964 | */ | |
b34cbebf | 3965 | static |
8be98f9a MD |
3966 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
3967 | { | |
3968 | int ret = 0; | |
3969 | struct ust_app_session *ua_sess; | |
7972aab2 | 3970 | struct ust_registry_session *registry; |
8be98f9a | 3971 | |
852d0037 | 3972 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
3973 | |
3974 | rcu_read_lock(); | |
3975 | ||
e0c7ec2b | 3976 | if (!app->compatible) { |
d88aee68 | 3977 | goto end_no_session; |
e0c7ec2b DG |
3978 | } |
3979 | ||
8be98f9a MD |
3980 | ua_sess = lookup_session_by_app(usess, app); |
3981 | if (ua_sess == NULL) { | |
d88aee68 | 3982 | goto end_no_session; |
8be98f9a MD |
3983 | } |
3984 | ||
d88aee68 DG |
3985 | pthread_mutex_lock(&ua_sess->lock); |
3986 | ||
9bc07046 DG |
3987 | /* |
3988 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
3989 | * that was never started. It's possible since we can have a fail start |
3990 | * from either the application manager thread or the command thread. Simply | |
3991 | * indicate that this is a stop error. | |
9bc07046 | 3992 | */ |
f9dfc3d9 | 3993 | if (!ua_sess->started) { |
c45536e1 DG |
3994 | goto error_rcu_unlock; |
3995 | } | |
7db205b5 | 3996 | |
840cb59c | 3997 | health_code_update(); |
86acf0da | 3998 | |
9d6c7d3f | 3999 | /* This inhibits UST tracing */ |
852d0037 | 4000 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
9d6c7d3f | 4001 | if (ret < 0) { |
ffe60014 DG |
4002 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4003 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
4004 | app->pid, ret); | |
4005 | } else { | |
4006 | DBG("UST app stop session failed. Application is dead."); | |
3757b385 DG |
4007 | /* |
4008 | * This is normal behavior, an application can die during the | |
4009 | * creation process. Don't report an error so the execution can | |
4010 | * continue normally. | |
4011 | */ | |
4012 | goto end_unlock; | |
ffe60014 | 4013 | } |
9d6c7d3f DG |
4014 | goto error_rcu_unlock; |
4015 | } | |
4016 | ||
840cb59c | 4017 | health_code_update(); |
86acf0da | 4018 | |
9d6c7d3f | 4019 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
4020 | ret = ustctl_wait_quiescent(app->sock); |
4021 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4022 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4023 | app->pid, ret); | |
4024 | } | |
9d6c7d3f | 4025 | |
840cb59c | 4026 | health_code_update(); |
86acf0da | 4027 | |
b34cbebf MD |
4028 | registry = get_session_registry(ua_sess); |
4029 | assert(registry); | |
1b532a60 DG |
4030 | |
4031 | if (!registry->metadata_closed) { | |
4032 | /* Push metadata for application before freeing the application. */ | |
4033 | (void) push_metadata(registry, ua_sess->consumer); | |
4034 | } | |
b34cbebf | 4035 | |
3757b385 | 4036 | end_unlock: |
b34cbebf MD |
4037 | pthread_mutex_unlock(&ua_sess->lock); |
4038 | end_no_session: | |
4039 | rcu_read_unlock(); | |
4040 | health_code_update(); | |
4041 | return 0; | |
4042 | ||
4043 | error_rcu_unlock: | |
4044 | pthread_mutex_unlock(&ua_sess->lock); | |
4045 | rcu_read_unlock(); | |
4046 | health_code_update(); | |
4047 | return -1; | |
4048 | } | |
4049 | ||
4050 | /* | |
4051 | * Flush buffers for a specific UST session and app. | |
4052 | */ | |
4053 | static | |
4054 | int ust_app_flush_trace(struct ltt_ust_session *usess, struct ust_app *app) | |
4055 | { | |
4056 | int ret = 0; | |
4057 | struct lttng_ht_iter iter; | |
4058 | struct ust_app_session *ua_sess; | |
4059 | struct ust_app_channel *ua_chan; | |
4060 | ||
4061 | DBG("Flushing buffers for ust app pid %d", app->pid); | |
4062 | ||
4063 | rcu_read_lock(); | |
4064 | ||
4065 | if (!app->compatible) { | |
4066 | goto end_no_session; | |
4067 | } | |
4068 | ||
4069 | ua_sess = lookup_session_by_app(usess, app); | |
4070 | if (ua_sess == NULL) { | |
4071 | goto end_no_session; | |
4072 | } | |
4073 | ||
4074 | pthread_mutex_lock(&ua_sess->lock); | |
4075 | ||
4076 | health_code_update(); | |
4077 | ||
9d6c7d3f | 4078 | /* Flushing buffers */ |
bec39940 DG |
4079 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
4080 | node.node) { | |
840cb59c | 4081 | health_code_update(); |
ffe60014 | 4082 | assert(ua_chan->is_sent); |
852d0037 | 4083 | ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj); |
8be98f9a | 4084 | if (ret < 0) { |
ffe60014 DG |
4085 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4086 | ERR("UST app PID %d channel %s flush failed with ret %d", | |
4087 | app->pid, ua_chan->name, ret); | |
4088 | } else { | |
4089 | DBG3("UST app failed to flush %s. Application is dead.", | |
4090 | ua_chan->name); | |
3757b385 DG |
4091 | /* |
4092 | * This is normal behavior, an application can die during the | |
4093 | * creation process. Don't report an error so the execution can | |
4094 | * continue normally. | |
4095 | */ | |
ffe60014 | 4096 | } |
6d3686da DG |
4097 | /* Continuing flushing all buffers */ |
4098 | continue; | |
8be98f9a MD |
4099 | } |
4100 | } | |
8be98f9a | 4101 | |
840cb59c | 4102 | health_code_update(); |
86acf0da | 4103 | |
d88aee68 DG |
4104 | pthread_mutex_unlock(&ua_sess->lock); |
4105 | end_no_session: | |
7db205b5 | 4106 | rcu_read_unlock(); |
840cb59c | 4107 | health_code_update(); |
8be98f9a | 4108 | return 0; |
8be98f9a MD |
4109 | } |
4110 | ||
84cd17c6 MD |
4111 | /* |
4112 | * Destroy a specific UST session in apps. | |
4113 | */ | |
3353de95 | 4114 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 4115 | { |
ffe60014 | 4116 | int ret; |
84cd17c6 | 4117 | struct ust_app_session *ua_sess; |
bec39940 | 4118 | struct lttng_ht_iter iter; |
d9bf3ca4 | 4119 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 4120 | |
852d0037 | 4121 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
4122 | |
4123 | rcu_read_lock(); | |
4124 | ||
e0c7ec2b DG |
4125 | if (!app->compatible) { |
4126 | goto end; | |
4127 | } | |
4128 | ||
84cd17c6 | 4129 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 4130 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 4131 | if (node == NULL) { |
d42f20df DG |
4132 | /* Session is being or is deleted. */ |
4133 | goto end; | |
84cd17c6 MD |
4134 | } |
4135 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 4136 | |
840cb59c | 4137 | health_code_update(); |
d0b96690 | 4138 | destroy_app_session(app, ua_sess); |
84cd17c6 | 4139 | |
840cb59c | 4140 | health_code_update(); |
7db205b5 | 4141 | |
84cd17c6 | 4142 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
4143 | ret = ustctl_wait_quiescent(app->sock); |
4144 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4145 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4146 | app->pid, ret); | |
4147 | } | |
e0c7ec2b DG |
4148 | end: |
4149 | rcu_read_unlock(); | |
840cb59c | 4150 | health_code_update(); |
84cd17c6 | 4151 | return 0; |
84cd17c6 MD |
4152 | } |
4153 | ||
5b4a0ec0 DG |
4154 | /* |
4155 | * Start tracing for the UST session. | |
4156 | */ | |
421cb601 DG |
4157 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
4158 | { | |
4159 | int ret = 0; | |
bec39940 | 4160 | struct lttng_ht_iter iter; |
421cb601 | 4161 | struct ust_app *app; |
48842b30 | 4162 | |
421cb601 DG |
4163 | DBG("Starting all UST traces"); |
4164 | ||
4165 | rcu_read_lock(); | |
421cb601 | 4166 | |
852d0037 | 4167 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
421cb601 | 4168 | ret = ust_app_start_trace(usess, app); |
48842b30 | 4169 | if (ret < 0) { |
5b4a0ec0 DG |
4170 | /* Continue to next apps even on error */ |
4171 | continue; | |
48842b30 | 4172 | } |
48842b30 | 4173 | } |
5b4a0ec0 | 4174 | |
48842b30 DG |
4175 | rcu_read_unlock(); |
4176 | ||
4177 | return 0; | |
4178 | } | |
487cf67c | 4179 | |
8be98f9a MD |
4180 | /* |
4181 | * Start tracing for the UST session. | |
4182 | */ | |
4183 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
4184 | { | |
4185 | int ret = 0; | |
bec39940 | 4186 | struct lttng_ht_iter iter; |
8be98f9a MD |
4187 | struct ust_app *app; |
4188 | ||
4189 | DBG("Stopping all UST traces"); | |
4190 | ||
4191 | rcu_read_lock(); | |
4192 | ||
b34cbebf MD |
4193 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4194 | ret = ust_app_stop_trace(usess, app); | |
4195 | if (ret < 0) { | |
4196 | /* Continue to next apps even on error */ | |
4197 | continue; | |
4198 | } | |
4199 | } | |
4200 | ||
b0a5f0fb | 4201 | /* Flush buffers and push metadata (for UID buffers). */ |
b34cbebf MD |
4202 | switch (usess->buffer_type) { |
4203 | case LTTNG_BUFFER_PER_UID: | |
4204 | { | |
7972aab2 | 4205 | struct buffer_reg_uid *reg; |
b34cbebf MD |
4206 | |
4207 | /* Flush all per UID buffers associated to that session. */ | |
7972aab2 | 4208 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
b0a5f0fb | 4209 | struct ust_registry_session *ust_session_reg; |
7972aab2 DG |
4210 | struct buffer_reg_channel *reg_chan; |
4211 | struct consumer_socket *socket; | |
4212 | ||
4213 | /* Get consumer socket to use to push the metadata.*/ | |
4214 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
4215 | usess->consumer); | |
4216 | if (!socket) { | |
4217 | /* Ignore request if no consumer is found for the session. */ | |
4218 | continue; | |
4219 | } | |
4220 | ||
4221 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
4222 | reg_chan, node.node) { | |
4223 | /* | |
4224 | * The following call will print error values so the return | |
4225 | * code is of little importance because whatever happens, we | |
4226 | * have to try them all. | |
4227 | */ | |
4228 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
4229 | } | |
b0a5f0fb MD |
4230 | |
4231 | ust_session_reg = reg->registry->reg.ust; | |
4232 | if (!ust_session_reg->metadata_closed) { | |
4233 | /* Push metadata. */ | |
4234 | (void) push_metadata(ust_session_reg, usess->consumer); | |
4235 | } | |
7972aab2 | 4236 | } |
b0a5f0fb | 4237 | |
b34cbebf | 4238 | break; |
7972aab2 | 4239 | } |
b34cbebf MD |
4240 | case LTTNG_BUFFER_PER_PID: |
4241 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4242 | ret = ust_app_flush_trace(usess, app); | |
4243 | if (ret < 0) { | |
4244 | /* Continue to next apps even on error */ | |
4245 | continue; | |
4246 | } | |
8be98f9a | 4247 | } |
b34cbebf MD |
4248 | break; |
4249 | default: | |
4250 | assert(0); | |
4251 | break; | |
8be98f9a MD |
4252 | } |
4253 | ||
4254 | rcu_read_unlock(); | |
4255 | ||
4256 | return 0; | |
4257 | } | |
4258 | ||
84cd17c6 MD |
4259 | /* |
4260 | * Destroy app UST session. | |
4261 | */ | |
4262 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
4263 | { | |
4264 | int ret = 0; | |
bec39940 | 4265 | struct lttng_ht_iter iter; |
84cd17c6 MD |
4266 | struct ust_app *app; |
4267 | ||
4268 | DBG("Destroy all UST traces"); | |
4269 | ||
4270 | rcu_read_lock(); | |
4271 | ||
852d0037 | 4272 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 4273 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
4274 | if (ret < 0) { |
4275 | /* Continue to next apps even on error */ | |
4276 | continue; | |
4277 | } | |
4278 | } | |
4279 | ||
4280 | rcu_read_unlock(); | |
4281 | ||
4282 | return 0; | |
4283 | } | |
4284 | ||
5b4a0ec0 DG |
4285 | /* |
4286 | * Add channels/events from UST global domain to registered apps at sock. | |
4287 | */ | |
487cf67c DG |
4288 | void ust_app_global_update(struct ltt_ust_session *usess, int sock) |
4289 | { | |
55c54cce | 4290 | int ret = 0; |
31746f93 | 4291 | struct lttng_ht_iter iter, uiter; |
487cf67c | 4292 | struct ust_app *app; |
3d8ca23b | 4293 | struct ust_app_session *ua_sess = NULL; |
487cf67c DG |
4294 | struct ust_app_channel *ua_chan; |
4295 | struct ust_app_event *ua_event; | |
727d5404 | 4296 | struct ust_app_ctx *ua_ctx; |
1f3580c7 | 4297 | |
95e047ff | 4298 | assert(usess); |
ffe60014 | 4299 | assert(sock >= 0); |
1f3580c7 | 4300 | |
d9bf3ca4 | 4301 | DBG2("UST app global update for app sock %d for session id %" PRIu64, sock, |
a991f516 | 4302 | usess->id); |
487cf67c | 4303 | |
284d8f55 DG |
4304 | rcu_read_lock(); |
4305 | ||
f20baf8e | 4306 | app = ust_app_find_by_sock(sock); |
487cf67c | 4307 | if (app == NULL) { |
d88aee68 DG |
4308 | /* |
4309 | * Application can be unregistered before so this is possible hence | |
4310 | * simply stopping the update. | |
4311 | */ | |
4312 | DBG3("UST app update failed to find app sock %d", sock); | |
487cf67c DG |
4313 | goto error; |
4314 | } | |
4315 | ||
e0c7ec2b DG |
4316 | if (!app->compatible) { |
4317 | goto error; | |
4318 | } | |
4319 | ||
3d8ca23b DG |
4320 | ret = create_ust_app_session(usess, app, &ua_sess, NULL); |
4321 | if (ret < 0) { | |
4322 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
4323 | goto error; |
4324 | } | |
3d8ca23b | 4325 | assert(ua_sess); |
487cf67c | 4326 | |
d0b96690 DG |
4327 | pthread_mutex_lock(&ua_sess->lock); |
4328 | ||
284d8f55 | 4329 | /* |
d0b96690 | 4330 | * We can iterate safely here over all UST app session since the create ust |
284d8f55 DG |
4331 | * app session above made a shadow copy of the UST global domain from the |
4332 | * ltt ust session. | |
4333 | */ | |
bec39940 DG |
4334 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
4335 | node.node) { | |
ad7a9107 DG |
4336 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
4337 | if (ret < 0) { | |
4338 | /* | |
4339 | * Stop everything. On error, the application failed, no more | |
4340 | * file descriptor are available or ENOMEM so stopping here is | |
4341 | * the only thing we can do for now. | |
4342 | */ | |
4343 | goto error_unlock; | |
487cf67c DG |
4344 | } |
4345 | ||
31746f93 DG |
4346 | /* |
4347 | * Add context using the list so they are enabled in the same order the | |
4348 | * user added them. | |
4349 | */ | |
4350 | cds_list_for_each_entry(ua_ctx, &ua_chan->ctx_list, list) { | |
727d5404 DG |
4351 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); |
4352 | if (ret < 0) { | |
d0b96690 | 4353 | goto error_unlock; |
727d5404 DG |
4354 | } |
4355 | } | |
4356 | ||
4357 | ||
284d8f55 | 4358 | /* For each events */ |
bec39940 DG |
4359 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
4360 | node.node) { | |
284d8f55 DG |
4361 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
4362 | if (ret < 0) { | |
d0b96690 | 4363 | goto error_unlock; |
487cf67c | 4364 | } |
36dc12cc | 4365 | } |
487cf67c DG |
4366 | } |
4367 | ||
d0b96690 DG |
4368 | pthread_mutex_unlock(&ua_sess->lock); |
4369 | ||
14fb1ebe | 4370 | if (usess->active) { |
421cb601 | 4371 | ret = ust_app_start_trace(usess, app); |
36dc12cc | 4372 | if (ret < 0) { |
36dc12cc DG |
4373 | goto error; |
4374 | } | |
4375 | ||
852d0037 | 4376 | DBG2("UST trace started for app pid %d", app->pid); |
36dc12cc DG |
4377 | } |
4378 | ||
ffe60014 DG |
4379 | /* Everything went well at this point. */ |
4380 | rcu_read_unlock(); | |
4381 | return; | |
4382 | ||
d0b96690 DG |
4383 | error_unlock: |
4384 | pthread_mutex_unlock(&ua_sess->lock); | |
487cf67c | 4385 | error: |
ffe60014 | 4386 | if (ua_sess) { |
d0b96690 | 4387 | destroy_app_session(app, ua_sess); |
ffe60014 | 4388 | } |
487cf67c DG |
4389 | rcu_read_unlock(); |
4390 | return; | |
4391 | } | |
55cc08a6 DG |
4392 | |
4393 | /* | |
4394 | * Add context to a specific channel for global UST domain. | |
4395 | */ | |
4396 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
4397 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
4398 | { | |
4399 | int ret = 0; | |
bec39940 DG |
4400 | struct lttng_ht_node_str *ua_chan_node; |
4401 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
4402 | struct ust_app_channel *ua_chan = NULL; |
4403 | struct ust_app_session *ua_sess; | |
4404 | struct ust_app *app; | |
4405 | ||
4406 | rcu_read_lock(); | |
4407 | ||
852d0037 | 4408 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4409 | if (!app->compatible) { |
4410 | /* | |
4411 | * TODO: In time, we should notice the caller of this error by | |
4412 | * telling him that this is a version error. | |
4413 | */ | |
4414 | continue; | |
4415 | } | |
55cc08a6 DG |
4416 | ua_sess = lookup_session_by_app(usess, app); |
4417 | if (ua_sess == NULL) { | |
4418 | continue; | |
4419 | } | |
4420 | ||
d0b96690 | 4421 | pthread_mutex_lock(&ua_sess->lock); |
55cc08a6 | 4422 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4423 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4424 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 4425 | if (ua_chan_node == NULL) { |
d0b96690 | 4426 | goto next_app; |
55cc08a6 DG |
4427 | } |
4428 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
4429 | node); | |
55cc08a6 DG |
4430 | ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app); |
4431 | if (ret < 0) { | |
d0b96690 | 4432 | goto next_app; |
55cc08a6 | 4433 | } |
d0b96690 DG |
4434 | next_app: |
4435 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
4436 | } |
4437 | ||
55cc08a6 DG |
4438 | rcu_read_unlock(); |
4439 | return ret; | |
4440 | } | |
4441 | ||
76d45b40 DG |
4442 | /* |
4443 | * Enable event for a channel from a UST session for a specific PID. | |
4444 | */ | |
4445 | int ust_app_enable_event_pid(struct ltt_ust_session *usess, | |
4446 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4447 | { | |
4448 | int ret = 0; | |
bec39940 | 4449 | struct lttng_ht_iter iter; |
18eace3b | 4450 | struct lttng_ht_node_str *ua_chan_node; |
76d45b40 DG |
4451 | struct ust_app *app; |
4452 | struct ust_app_session *ua_sess; | |
4453 | struct ust_app_channel *ua_chan; | |
4454 | struct ust_app_event *ua_event; | |
4455 | ||
4456 | DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid); | |
4457 | ||
4458 | rcu_read_lock(); | |
4459 | ||
4460 | app = ust_app_find_by_pid(pid); | |
4461 | if (app == NULL) { | |
4462 | ERR("UST app enable event per PID %d not found", pid); | |
4463 | ret = -1; | |
d0b96690 | 4464 | goto end; |
76d45b40 DG |
4465 | } |
4466 | ||
e0c7ec2b DG |
4467 | if (!app->compatible) { |
4468 | ret = 0; | |
d0b96690 | 4469 | goto end; |
e0c7ec2b DG |
4470 | } |
4471 | ||
76d45b40 | 4472 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4473 | if (!ua_sess) { |
4474 | /* The application has problem or is probably dead. */ | |
d0b96690 DG |
4475 | ret = 0; |
4476 | goto end; | |
c4a1715b | 4477 | } |
76d45b40 | 4478 | |
d0b96690 | 4479 | pthread_mutex_lock(&ua_sess->lock); |
76d45b40 | 4480 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4481 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4482 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
76d45b40 DG |
4483 | /* If the channel is not found, there is a code flow error */ |
4484 | assert(ua_chan_node); | |
4485 | ||
4486 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4487 | ||
18eace3b | 4488 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 4489 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 4490 | if (ua_event == NULL) { |
76d45b40 DG |
4491 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
4492 | if (ret < 0) { | |
d0b96690 | 4493 | goto end_unlock; |
76d45b40 DG |
4494 | } |
4495 | } else { | |
76d45b40 DG |
4496 | ret = enable_ust_app_event(ua_sess, ua_event, app); |
4497 | if (ret < 0) { | |
d0b96690 | 4498 | goto end_unlock; |
76d45b40 DG |
4499 | } |
4500 | } | |
4501 | ||
d0b96690 DG |
4502 | end_unlock: |
4503 | pthread_mutex_unlock(&ua_sess->lock); | |
4504 | end: | |
76d45b40 DG |
4505 | rcu_read_unlock(); |
4506 | return ret; | |
4507 | } | |
7f79d3a1 | 4508 | |
4466912f DG |
4509 | /* |
4510 | * Calibrate registered applications. | |
4511 | */ | |
4512 | int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate) | |
4513 | { | |
4514 | int ret = 0; | |
4515 | struct lttng_ht_iter iter; | |
4516 | struct ust_app *app; | |
4517 | ||
4518 | rcu_read_lock(); | |
4519 | ||
852d0037 | 4520 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4466912f DG |
4521 | if (!app->compatible) { |
4522 | /* | |
4523 | * TODO: In time, we should notice the caller of this error by | |
4524 | * telling him that this is a version error. | |
4525 | */ | |
4526 | continue; | |
4527 | } | |
4528 | ||
840cb59c | 4529 | health_code_update(); |
86acf0da | 4530 | |
852d0037 | 4531 | ret = ustctl_calibrate(app->sock, calibrate); |
4466912f DG |
4532 | if (ret < 0) { |
4533 | switch (ret) { | |
4534 | case -ENOSYS: | |
4535 | /* Means that it's not implemented on the tracer side. */ | |
4536 | ret = 0; | |
4537 | break; | |
4538 | default: | |
4466912f | 4539 | DBG2("Calibrate app PID %d returned with error %d", |
852d0037 | 4540 | app->pid, ret); |
4466912f DG |
4541 | break; |
4542 | } | |
4543 | } | |
4544 | } | |
4545 | ||
4546 | DBG("UST app global domain calibration finished"); | |
4547 | ||
4548 | rcu_read_unlock(); | |
4549 | ||
840cb59c | 4550 | health_code_update(); |
86acf0da | 4551 | |
4466912f DG |
4552 | return ret; |
4553 | } | |
d0b96690 DG |
4554 | |
4555 | /* | |
4556 | * Receive registration and populate the given msg structure. | |
4557 | * | |
4558 | * On success return 0 else a negative value returned by the ustctl call. | |
4559 | */ | |
4560 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
4561 | { | |
4562 | int ret; | |
4563 | uint32_t pid, ppid, uid, gid; | |
4564 | ||
4565 | assert(msg); | |
4566 | ||
4567 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
4568 | &pid, &ppid, &uid, &gid, | |
4569 | &msg->bits_per_long, | |
4570 | &msg->uint8_t_alignment, | |
4571 | &msg->uint16_t_alignment, | |
4572 | &msg->uint32_t_alignment, | |
4573 | &msg->uint64_t_alignment, | |
4574 | &msg->long_alignment, | |
4575 | &msg->byte_order, | |
4576 | msg->name); | |
4577 | if (ret < 0) { | |
4578 | switch (-ret) { | |
4579 | case EPIPE: | |
4580 | case ECONNRESET: | |
4581 | case LTTNG_UST_ERR_EXITING: | |
4582 | DBG3("UST app recv reg message failed. Application died"); | |
4583 | break; | |
4584 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
4585 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
4586 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
4587 | LTTNG_UST_ABI_MINOR_VERSION); | |
4588 | break; | |
4589 | default: | |
4590 | ERR("UST app recv reg message failed with ret %d", ret); | |
4591 | break; | |
4592 | } | |
4593 | goto error; | |
4594 | } | |
4595 | msg->pid = (pid_t) pid; | |
4596 | msg->ppid = (pid_t) ppid; | |
4597 | msg->uid = (uid_t) uid; | |
4598 | msg->gid = (gid_t) gid; | |
4599 | ||
4600 | error: | |
4601 | return ret; | |
4602 | } | |
4603 | ||
d88aee68 DG |
4604 | /* |
4605 | * Return a ust app channel object using the application object and the channel | |
4606 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
4607 | * lock MUST be acquired before calling this function. | |
4608 | */ | |
d0b96690 DG |
4609 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
4610 | int objd) | |
4611 | { | |
4612 | struct lttng_ht_node_ulong *node; | |
4613 | struct lttng_ht_iter iter; | |
4614 | struct ust_app_channel *ua_chan = NULL; | |
4615 | ||
4616 | assert(app); | |
4617 | ||
4618 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
4619 | node = lttng_ht_iter_get_node_ulong(&iter); | |
4620 | if (node == NULL) { | |
4621 | DBG2("UST app channel find by objd %d not found", objd); | |
4622 | goto error; | |
4623 | } | |
4624 | ||
4625 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
4626 | ||
4627 | error: | |
4628 | return ua_chan; | |
4629 | } | |
4630 | ||
d88aee68 DG |
4631 | /* |
4632 | * Reply to a register channel notification from an application on the notify | |
4633 | * socket. The channel metadata is also created. | |
4634 | * | |
4635 | * The session UST registry lock is acquired in this function. | |
4636 | * | |
4637 | * On success 0 is returned else a negative value. | |
4638 | */ | |
d0b96690 DG |
4639 | static int reply_ust_register_channel(int sock, int sobjd, int cobjd, |
4640 | size_t nr_fields, struct ustctl_field *fields) | |
4641 | { | |
4642 | int ret, ret_code = 0; | |
4643 | uint32_t chan_id, reg_count; | |
7972aab2 | 4644 | uint64_t chan_reg_key; |
d0b96690 DG |
4645 | enum ustctl_channel_header type; |
4646 | struct ust_app *app; | |
4647 | struct ust_app_channel *ua_chan; | |
4648 | struct ust_app_session *ua_sess; | |
7972aab2 | 4649 | struct ust_registry_session *registry; |
45893984 | 4650 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
4651 | |
4652 | rcu_read_lock(); | |
4653 | ||
4654 | /* Lookup application. If not found, there is a code flow error. */ | |
4655 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4656 | if (!app) { |
4657 | DBG("Application socket %d is being teardown. Abort event notify", | |
4658 | sock); | |
4659 | ret = 0; | |
d5d629b5 | 4660 | free(fields); |
d88aee68 DG |
4661 | goto error_rcu_unlock; |
4662 | } | |
d0b96690 | 4663 | |
4950b860 | 4664 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4665 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4666 | if (!ua_chan) { |
4667 | DBG("Application channel is being teardown. Abort event notify"); | |
4668 | ret = 0; | |
d5d629b5 | 4669 | free(fields); |
4950b860 MD |
4670 | goto error_rcu_unlock; |
4671 | } | |
4672 | ||
d0b96690 DG |
4673 | assert(ua_chan->session); |
4674 | ua_sess = ua_chan->session; | |
d0b96690 | 4675 | |
7972aab2 DG |
4676 | /* Get right session registry depending on the session buffer type. */ |
4677 | registry = get_session_registry(ua_sess); | |
4678 | assert(registry); | |
45893984 | 4679 | |
7972aab2 DG |
4680 | /* Depending on the buffer type, a different channel key is used. */ |
4681 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4682 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 4683 | } else { |
7972aab2 | 4684 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
4685 | } |
4686 | ||
7972aab2 DG |
4687 | pthread_mutex_lock(®istry->lock); |
4688 | ||
4689 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
4690 | assert(chan_reg); | |
4691 | ||
4692 | if (!chan_reg->register_done) { | |
4693 | reg_count = ust_registry_get_event_count(chan_reg); | |
4694 | if (reg_count < 31) { | |
4695 | type = USTCTL_CHANNEL_HEADER_COMPACT; | |
4696 | } else { | |
4697 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
4698 | } | |
4699 | ||
4700 | chan_reg->nr_ctx_fields = nr_fields; | |
4701 | chan_reg->ctx_fields = fields; | |
4702 | chan_reg->header_type = type; | |
d0b96690 | 4703 | } else { |
7972aab2 DG |
4704 | /* Get current already assigned values. */ |
4705 | type = chan_reg->header_type; | |
d5d629b5 DG |
4706 | free(fields); |
4707 | /* Set to NULL so the error path does not do a double free. */ | |
4708 | fields = NULL; | |
d0b96690 | 4709 | } |
7972aab2 DG |
4710 | /* Channel id is set during the object creation. */ |
4711 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
4712 | |
4713 | /* Append to metadata */ | |
7972aab2 DG |
4714 | if (!chan_reg->metadata_dumped) { |
4715 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
4716 | if (ret_code) { |
4717 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
4718 | goto reply; | |
4719 | } | |
4720 | } | |
4721 | ||
4722 | reply: | |
7972aab2 DG |
4723 | DBG3("UST app replying to register channel key %" PRIu64 |
4724 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
4725 | ret_code); | |
d0b96690 DG |
4726 | |
4727 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
4728 | if (ret < 0) { | |
4729 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4730 | ERR("UST app reply channel failed with ret %d", ret); | |
4731 | } else { | |
4732 | DBG3("UST app reply channel failed. Application died"); | |
4733 | } | |
4734 | goto error; | |
4735 | } | |
4736 | ||
7972aab2 DG |
4737 | /* This channel registry registration is completed. */ |
4738 | chan_reg->register_done = 1; | |
4739 | ||
d0b96690 | 4740 | error: |
7972aab2 | 4741 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4742 | error_rcu_unlock: |
d0b96690 | 4743 | rcu_read_unlock(); |
d5d629b5 DG |
4744 | if (ret) { |
4745 | free(fields); | |
4746 | } | |
d0b96690 DG |
4747 | return ret; |
4748 | } | |
4749 | ||
d88aee68 DG |
4750 | /* |
4751 | * Add event to the UST channel registry. When the event is added to the | |
4752 | * registry, the metadata is also created. Once done, this replies to the | |
4753 | * application with the appropriate error code. | |
4754 | * | |
4755 | * The session UST registry lock is acquired in the function. | |
4756 | * | |
4757 | * On success 0 is returned else a negative value. | |
4758 | */ | |
d0b96690 DG |
4759 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
4760 | char *sig, size_t nr_fields, struct ustctl_field *fields, int loglevel, | |
4761 | char *model_emf_uri) | |
4762 | { | |
4763 | int ret, ret_code; | |
4764 | uint32_t event_id = 0; | |
7972aab2 | 4765 | uint64_t chan_reg_key; |
d0b96690 DG |
4766 | struct ust_app *app; |
4767 | struct ust_app_channel *ua_chan; | |
4768 | struct ust_app_session *ua_sess; | |
7972aab2 | 4769 | struct ust_registry_session *registry; |
d0b96690 DG |
4770 | |
4771 | rcu_read_lock(); | |
4772 | ||
4773 | /* Lookup application. If not found, there is a code flow error. */ | |
4774 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4775 | if (!app) { |
4776 | DBG("Application socket %d is being teardown. Abort event notify", | |
4777 | sock); | |
4778 | ret = 0; | |
d5d629b5 DG |
4779 | free(sig); |
4780 | free(fields); | |
4781 | free(model_emf_uri); | |
d88aee68 DG |
4782 | goto error_rcu_unlock; |
4783 | } | |
d0b96690 | 4784 | |
4950b860 | 4785 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4786 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4787 | if (!ua_chan) { |
4788 | DBG("Application channel is being teardown. Abort event notify"); | |
4789 | ret = 0; | |
d5d629b5 DG |
4790 | free(sig); |
4791 | free(fields); | |
4792 | free(model_emf_uri); | |
4950b860 MD |
4793 | goto error_rcu_unlock; |
4794 | } | |
4795 | ||
d0b96690 DG |
4796 | assert(ua_chan->session); |
4797 | ua_sess = ua_chan->session; | |
4798 | ||
7972aab2 DG |
4799 | registry = get_session_registry(ua_sess); |
4800 | assert(registry); | |
4801 | ||
4802 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4803 | chan_reg_key = ua_chan->tracing_channel_id; | |
4804 | } else { | |
4805 | chan_reg_key = ua_chan->key; | |
4806 | } | |
4807 | ||
4808 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 4809 | |
d5d629b5 DG |
4810 | /* |
4811 | * From this point on, this call acquires the ownership of the sig, fields | |
4812 | * and model_emf_uri meaning any free are done inside it if needed. These | |
4813 | * three variables MUST NOT be read/write after this. | |
4814 | */ | |
7972aab2 | 4815 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
45893984 | 4816 | sobjd, cobjd, name, sig, nr_fields, fields, loglevel, |
8494bda5 MD |
4817 | model_emf_uri, ua_sess->buffer_type, &event_id, |
4818 | app); | |
d0b96690 DG |
4819 | |
4820 | /* | |
4821 | * The return value is returned to ustctl so in case of an error, the | |
4822 | * application can be notified. In case of an error, it's important not to | |
4823 | * return a negative error or else the application will get closed. | |
4824 | */ | |
4825 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
4826 | if (ret < 0) { | |
4827 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4828 | ERR("UST app reply event failed with ret %d", ret); | |
4829 | } else { | |
4830 | DBG3("UST app reply event failed. Application died"); | |
4831 | } | |
4832 | /* | |
4833 | * No need to wipe the create event since the application socket will | |
4834 | * get close on error hence cleaning up everything by itself. | |
4835 | */ | |
4836 | goto error; | |
4837 | } | |
4838 | ||
7972aab2 DG |
4839 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
4840 | name, event_id); | |
d88aee68 | 4841 | |
d0b96690 | 4842 | error: |
7972aab2 | 4843 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4844 | error_rcu_unlock: |
d0b96690 DG |
4845 | rcu_read_unlock(); |
4846 | return ret; | |
4847 | } | |
4848 | ||
d88aee68 DG |
4849 | /* |
4850 | * Handle application notification through the given notify socket. | |
4851 | * | |
4852 | * Return 0 on success or else a negative value. | |
4853 | */ | |
d0b96690 DG |
4854 | int ust_app_recv_notify(int sock) |
4855 | { | |
4856 | int ret; | |
4857 | enum ustctl_notify_cmd cmd; | |
4858 | ||
4859 | DBG3("UST app receiving notify from sock %d", sock); | |
4860 | ||
4861 | ret = ustctl_recv_notify(sock, &cmd); | |
4862 | if (ret < 0) { | |
4863 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4864 | ERR("UST app recv notify failed with ret %d", ret); | |
4865 | } else { | |
4866 | DBG3("UST app recv notify failed. Application died"); | |
4867 | } | |
4868 | goto error; | |
4869 | } | |
4870 | ||
4871 | switch (cmd) { | |
4872 | case USTCTL_NOTIFY_CMD_EVENT: | |
4873 | { | |
4874 | int sobjd, cobjd, loglevel; | |
4875 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; | |
4876 | size_t nr_fields; | |
4877 | struct ustctl_field *fields; | |
4878 | ||
4879 | DBG2("UST app ustctl register event received"); | |
4880 | ||
4881 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, &loglevel, | |
4882 | &sig, &nr_fields, &fields, &model_emf_uri); | |
4883 | if (ret < 0) { | |
4884 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4885 | ERR("UST app recv event failed with ret %d", ret); | |
4886 | } else { | |
4887 | DBG3("UST app recv event failed. Application died"); | |
4888 | } | |
4889 | goto error; | |
4890 | } | |
4891 | ||
d5d629b5 DG |
4892 | /* |
4893 | * Add event to the UST registry coming from the notify socket. This | |
4894 | * call will free if needed the sig, fields and model_emf_uri. This | |
4895 | * code path loses the ownsership of these variables and transfer them | |
4896 | * to the this function. | |
4897 | */ | |
d0b96690 DG |
4898 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
4899 | fields, loglevel, model_emf_uri); | |
4900 | if (ret < 0) { | |
4901 | goto error; | |
4902 | } | |
4903 | ||
4904 | break; | |
4905 | } | |
4906 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
4907 | { | |
4908 | int sobjd, cobjd; | |
4909 | size_t nr_fields; | |
4910 | struct ustctl_field *fields; | |
4911 | ||
4912 | DBG2("UST app ustctl register channel received"); | |
4913 | ||
4914 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
4915 | &fields); | |
4916 | if (ret < 0) { | |
4917 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4918 | ERR("UST app recv channel failed with ret %d", ret); | |
4919 | } else { | |
4920 | DBG3("UST app recv channel failed. Application died"); | |
4921 | } | |
4922 | goto error; | |
4923 | } | |
4924 | ||
d5d629b5 DG |
4925 | /* |
4926 | * The fields ownership are transfered to this function call meaning | |
4927 | * that if needed it will be freed. After this, it's invalid to access | |
4928 | * fields or clean it up. | |
4929 | */ | |
d0b96690 DG |
4930 | ret = reply_ust_register_channel(sock, sobjd, cobjd, nr_fields, |
4931 | fields); | |
4932 | if (ret < 0) { | |
4933 | goto error; | |
4934 | } | |
4935 | ||
4936 | break; | |
4937 | } | |
4938 | default: | |
4939 | /* Should NEVER happen. */ | |
4940 | assert(0); | |
4941 | } | |
4942 | ||
4943 | error: | |
4944 | return ret; | |
4945 | } | |
d88aee68 DG |
4946 | |
4947 | /* | |
4948 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
4949 | * corresponding application. On failure, the call_rcu to close the socket is | |
4950 | * executed. If an application is found, it tries to delete it from the notify | |
4951 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
4952 | * | |
4953 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
4954 | * call RCU is not done but the rest of the cleanup is. | |
4955 | */ | |
4956 | void ust_app_notify_sock_unregister(int sock) | |
4957 | { | |
4958 | int err_enomem = 0; | |
4959 | struct lttng_ht_iter iter; | |
4960 | struct ust_app *app; | |
4961 | struct ust_app_notify_sock_obj *obj; | |
4962 | ||
4963 | assert(sock >= 0); | |
4964 | ||
4965 | rcu_read_lock(); | |
4966 | ||
4967 | obj = zmalloc(sizeof(*obj)); | |
4968 | if (!obj) { | |
4969 | /* | |
4970 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
4971 | * procedure but the call_rcu will not be called. In this case, we | |
4972 | * accept the fd leak rather than possibly creating an unsynchronized | |
4973 | * state between threads. | |
4974 | * | |
4975 | * TODO: The notify object should be created once the notify socket is | |
4976 | * registered and stored independantely from the ust app object. The | |
4977 | * tricky part is to synchronize the teardown of the application and | |
4978 | * this notify object. Let's keep that in mind so we can avoid this | |
4979 | * kind of shenanigans with ENOMEM in the teardown path. | |
4980 | */ | |
4981 | err_enomem = 1; | |
4982 | } else { | |
4983 | obj->fd = sock; | |
4984 | } | |
4985 | ||
4986 | DBG("UST app notify socket unregister %d", sock); | |
4987 | ||
4988 | /* | |
4989 | * Lookup application by notify socket. If this fails, this means that the | |
4990 | * hash table delete has already been done by the application | |
4991 | * unregistration process so we can safely close the notify socket in a | |
4992 | * call RCU. | |
4993 | */ | |
4994 | app = find_app_by_notify_sock(sock); | |
4995 | if (!app) { | |
4996 | goto close_socket; | |
4997 | } | |
4998 | ||
4999 | iter.iter.node = &app->notify_sock_n.node; | |
5000 | ||
5001 | /* | |
5002 | * Whatever happens here either we fail or succeed, in both cases we have | |
5003 | * to close the socket after a grace period to continue to the call RCU | |
5004 | * here. If the deletion is successful, the application is not visible | |
5005 | * anymore by other threads and is it fails it means that it was already | |
5006 | * deleted from the hash table so either way we just have to close the | |
5007 | * socket. | |
5008 | */ | |
5009 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
5010 | ||
5011 | close_socket: | |
5012 | rcu_read_unlock(); | |
5013 | ||
5014 | /* | |
5015 | * Close socket after a grace period to avoid for the socket to be reused | |
5016 | * before the application object is freed creating potential race between | |
5017 | * threads trying to add unique in the global hash table. | |
5018 | */ | |
5019 | if (!err_enomem) { | |
5020 | call_rcu(&obj->head, close_notify_sock_rcu); | |
5021 | } | |
5022 | } | |
f45e313d DG |
5023 | |
5024 | /* | |
5025 | * Destroy a ust app data structure and free its memory. | |
5026 | */ | |
5027 | void ust_app_destroy(struct ust_app *app) | |
5028 | { | |
5029 | if (!app) { | |
5030 | return; | |
5031 | } | |
5032 | ||
5033 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
5034 | } | |
6dc3064a DG |
5035 | |
5036 | /* | |
5037 | * Take a snapshot for a given UST session. The snapshot is sent to the given | |
5038 | * output. | |
5039 | * | |
5040 | * Return 0 on success or else a negative value. | |
5041 | */ | |
5042 | int ust_app_snapshot_record(struct ltt_ust_session *usess, | |
68808f4e | 5043 | struct snapshot_output *output, int wait, uint64_t max_stream_size) |
6dc3064a DG |
5044 | { |
5045 | int ret = 0; | |
7badf927 | 5046 | unsigned int snapshot_done = 0; |
6dc3064a DG |
5047 | struct lttng_ht_iter iter; |
5048 | struct ust_app *app; | |
af706bb7 | 5049 | char pathname[PATH_MAX]; |
6dc3064a DG |
5050 | |
5051 | assert(usess); | |
5052 | assert(output); | |
5053 | ||
5054 | rcu_read_lock(); | |
5055 | ||
8c924c7b MD |
5056 | switch (usess->buffer_type) { |
5057 | case LTTNG_BUFFER_PER_UID: | |
5058 | { | |
5059 | struct buffer_reg_uid *reg; | |
6dc3064a | 5060 | |
8c924c7b MD |
5061 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
5062 | struct buffer_reg_channel *reg_chan; | |
5063 | struct consumer_socket *socket; | |
6dc3064a | 5064 | |
8c924c7b MD |
5065 | /* Get consumer socket to use to push the metadata.*/ |
5066 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
5067 | usess->consumer); | |
5068 | if (!socket) { | |
5069 | ret = -EINVAL; | |
5070 | goto error; | |
5071 | } | |
6dc3064a | 5072 | |
8c924c7b MD |
5073 | memset(pathname, 0, sizeof(pathname)); |
5074 | ret = snprintf(pathname, sizeof(pathname), | |
5075 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH, | |
5076 | reg->uid, reg->bits_per_long); | |
5077 | if (ret < 0) { | |
5078 | PERROR("snprintf snapshot path"); | |
5079 | goto error; | |
5080 | } | |
5081 | ||
5082 | /* Add the UST default trace dir to path. */ | |
5083 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
5084 | reg_chan, node.node) { | |
68808f4e DG |
5085 | ret = consumer_snapshot_channel(socket, reg_chan->consumer_key, |
5086 | output, 0, usess->uid, usess->gid, pathname, wait, | |
8c924c7b MD |
5087 | max_stream_size); |
5088 | if (ret < 0) { | |
5089 | goto error; | |
5090 | } | |
5091 | } | |
68808f4e DG |
5092 | ret = consumer_snapshot_channel(socket, |
5093 | reg->registry->reg.ust->metadata_key, output, 1, | |
5094 | usess->uid, usess->gid, pathname, wait, max_stream_size); | |
8c924c7b MD |
5095 | if (ret < 0) { |
5096 | goto error; | |
5097 | } | |
7badf927 | 5098 | snapshot_done = 1; |
af706bb7 | 5099 | } |
8c924c7b MD |
5100 | break; |
5101 | } | |
5102 | case LTTNG_BUFFER_PER_PID: | |
5103 | { | |
5104 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5105 | struct consumer_socket *socket; | |
5106 | struct lttng_ht_iter chan_iter; | |
5107 | struct ust_app_channel *ua_chan; | |
5108 | struct ust_app_session *ua_sess; | |
5109 | struct ust_registry_session *registry; | |
5110 | ||
5111 | ua_sess = lookup_session_by_app(usess, app); | |
5112 | if (!ua_sess) { | |
5113 | /* Session not associated with this app. */ | |
5114 | continue; | |
5115 | } | |
af706bb7 | 5116 | |
8c924c7b MD |
5117 | /* Get the right consumer socket for the application. */ |
5118 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
5119 | output->consumer); | |
5120 | if (!socket) { | |
5c786ded | 5121 | ret = -EINVAL; |
5c786ded JD |
5122 | goto error; |
5123 | } | |
5124 | ||
8c924c7b MD |
5125 | /* Add the UST default trace dir to path. */ |
5126 | memset(pathname, 0, sizeof(pathname)); | |
5127 | ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "/%s", | |
5128 | ua_sess->path); | |
6dc3064a | 5129 | if (ret < 0) { |
8c924c7b | 5130 | PERROR("snprintf snapshot path"); |
6dc3064a DG |
5131 | goto error; |
5132 | } | |
6dc3064a | 5133 | |
8c924c7b MD |
5134 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, |
5135 | ua_chan, node.node) { | |
68808f4e DG |
5136 | ret = consumer_snapshot_channel(socket, ua_chan->key, output, |
5137 | 0, ua_sess->euid, ua_sess->egid, pathname, wait, | |
8c924c7b MD |
5138 | max_stream_size); |
5139 | if (ret < 0) { | |
5140 | goto error; | |
5141 | } | |
5142 | } | |
5143 | ||
5144 | registry = get_session_registry(ua_sess); | |
5145 | assert(registry); | |
5146 | ret = consumer_snapshot_channel(socket, registry->metadata_key, output, | |
5147 | 1, ua_sess->euid, ua_sess->egid, pathname, wait, | |
5148 | max_stream_size); | |
5149 | if (ret < 0) { | |
5150 | goto error; | |
5151 | } | |
7badf927 | 5152 | snapshot_done = 1; |
8c924c7b MD |
5153 | } |
5154 | break; | |
5155 | } | |
5156 | default: | |
5157 | assert(0); | |
5158 | break; | |
6dc3064a DG |
5159 | } |
5160 | ||
7badf927 DG |
5161 | if (!snapshot_done) { |
5162 | /* | |
5163 | * If no snapshot was made and we are not in the error path, this means | |
5164 | * that there are no buffers thus no (prior) application to snapshot | |
5165 | * data from so we have simply NO data. | |
5166 | */ | |
5167 | ret = -ENODATA; | |
5168 | } | |
5169 | ||
6dc3064a DG |
5170 | error: |
5171 | rcu_read_unlock(); | |
5172 | return ret; | |
5173 | } | |
5c786ded JD |
5174 | |
5175 | /* | |
5176 | * Return the number of streams for a UST session. | |
5177 | */ | |
5178 | unsigned int ust_app_get_nb_stream(struct ltt_ust_session *usess) | |
5179 | { | |
5180 | unsigned int ret = 0; | |
5181 | struct ust_app *app; | |
5182 | struct lttng_ht_iter iter; | |
5183 | ||
5184 | assert(usess); | |
5185 | ||
5186 | switch (usess->buffer_type) { | |
5187 | case LTTNG_BUFFER_PER_UID: | |
5188 | { | |
5189 | struct buffer_reg_uid *reg; | |
5190 | ||
5191 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
5192 | struct buffer_reg_channel *reg_chan; | |
5193 | ||
b7064eaa | 5194 | rcu_read_lock(); |
5c786ded JD |
5195 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
5196 | reg_chan, node.node) { | |
5197 | ret += reg_chan->stream_count; | |
5198 | } | |
b7064eaa | 5199 | rcu_read_unlock(); |
5c786ded JD |
5200 | } |
5201 | break; | |
5202 | } | |
5203 | case LTTNG_BUFFER_PER_PID: | |
5204 | { | |
5205 | rcu_read_lock(); | |
5206 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5207 | struct ust_app_channel *ua_chan; | |
5208 | struct ust_app_session *ua_sess; | |
5209 | struct lttng_ht_iter chan_iter; | |
5210 | ||
5211 | ua_sess = lookup_session_by_app(usess, app); | |
5212 | if (!ua_sess) { | |
5213 | /* Session not associated with this app. */ | |
5214 | continue; | |
5215 | } | |
5216 | ||
5217 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
5218 | ua_chan, node.node) { | |
5219 | ret += ua_chan->streams.count; | |
5220 | } | |
5221 | } | |
5222 | rcu_read_unlock(); | |
5223 | break; | |
5224 | } | |
5225 | default: | |
5226 | assert(0); | |
5227 | break; | |
5228 | } | |
5229 | ||
5230 | return ret; | |
5231 | } |