Commit | Line | Data |
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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 | |
19 | #include <errno.h> | |
7972aab2 | 20 | #include <inttypes.h> |
91d76f53 DG |
21 | #include <pthread.h> |
22 | #include <stdio.h> | |
23 | #include <stdlib.h> | |
099e26bd | 24 | #include <string.h> |
aba8e916 DG |
25 | #include <sys/stat.h> |
26 | #include <sys/types.h> | |
099e26bd | 27 | #include <unistd.h> |
0df502fd | 28 | #include <urcu/compiler.h> |
fb54cdbf | 29 | #include <lttng/ust-error.h> |
331744e3 | 30 | #include <signal.h> |
bec39940 | 31 | |
990570ed | 32 | #include <common/common.h> |
86acf0da | 33 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 34 | |
7972aab2 | 35 | #include "buffer-registry.h" |
86acf0da | 36 | #include "fd-limit.h" |
8782cc74 | 37 | #include "health-sessiond.h" |
56fff090 | 38 | #include "ust-app.h" |
48842b30 | 39 | #include "ust-consumer.h" |
d80a6244 | 40 | #include "ust-ctl.h" |
0b2dc8df | 41 | #include "utils.h" |
d80a6244 | 42 | |
d9bf3ca4 MD |
43 | /* Next available channel key. Access under next_channel_key_lock. */ |
44 | static uint64_t _next_channel_key; | |
45 | static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER; | |
46 | ||
47 | /* Next available session ID. Access under next_session_id_lock. */ | |
48 | static uint64_t _next_session_id; | |
49 | static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER; | |
ffe60014 DG |
50 | |
51 | /* | |
d9bf3ca4 | 52 | * Return the incremented value of next_channel_key. |
ffe60014 | 53 | */ |
d9bf3ca4 | 54 | static uint64_t get_next_channel_key(void) |
ffe60014 | 55 | { |
d9bf3ca4 MD |
56 | uint64_t ret; |
57 | ||
58 | pthread_mutex_lock(&next_channel_key_lock); | |
59 | ret = ++_next_channel_key; | |
60 | pthread_mutex_unlock(&next_channel_key_lock); | |
61 | return ret; | |
ffe60014 DG |
62 | } |
63 | ||
64 | /* | |
7972aab2 | 65 | * Return the atomically incremented value of next_session_id. |
ffe60014 | 66 | */ |
d9bf3ca4 | 67 | static uint64_t get_next_session_id(void) |
ffe60014 | 68 | { |
d9bf3ca4 MD |
69 | uint64_t ret; |
70 | ||
71 | pthread_mutex_lock(&next_session_id_lock); | |
72 | ret = ++_next_session_id; | |
73 | pthread_mutex_unlock(&next_session_id_lock); | |
74 | return ret; | |
ffe60014 DG |
75 | } |
76 | ||
d65d2de8 DG |
77 | static void copy_channel_attr_to_ustctl( |
78 | struct ustctl_consumer_channel_attr *attr, | |
79 | struct lttng_ust_channel_attr *uattr) | |
80 | { | |
81 | /* Copy event attributes since the layout is different. */ | |
82 | attr->subbuf_size = uattr->subbuf_size; | |
83 | attr->num_subbuf = uattr->num_subbuf; | |
84 | attr->overwrite = uattr->overwrite; | |
85 | attr->switch_timer_interval = uattr->switch_timer_interval; | |
86 | attr->read_timer_interval = uattr->read_timer_interval; | |
87 | attr->output = uattr->output; | |
88 | } | |
89 | ||
025faf73 DG |
90 | /* |
91 | * Match function for the hash table lookup. | |
92 | * | |
93 | * It matches an ust app event based on three attributes which are the event | |
94 | * name, the filter bytecode and the loglevel. | |
95 | */ | |
18eace3b DG |
96 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
97 | { | |
98 | struct ust_app_event *event; | |
99 | const struct ust_app_ht_key *key; | |
100 | ||
101 | assert(node); | |
102 | assert(_key); | |
103 | ||
104 | event = caa_container_of(node, struct ust_app_event, node.node); | |
105 | key = _key; | |
106 | ||
1af53eb5 | 107 | /* Match the 4 elements of the key: name, filter, loglevel, exclusions */ |
18eace3b DG |
108 | |
109 | /* Event name */ | |
110 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
111 | goto no_match; | |
112 | } | |
113 | ||
114 | /* Event loglevel. */ | |
115 | if (event->attr.loglevel != key->loglevel) { | |
025faf73 DG |
116 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
117 | && key->loglevel == 0 && event->attr.loglevel == -1) { | |
118 | /* | |
119 | * Match is accepted. This is because on event creation, the | |
120 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
121 | * -1 are accepted for this loglevel type since 0 is the one set by | |
122 | * the API when receiving an enable event. | |
123 | */ | |
124 | } else { | |
125 | goto no_match; | |
126 | } | |
18eace3b DG |
127 | } |
128 | ||
129 | /* One of the filters is NULL, fail. */ | |
130 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
131 | goto no_match; | |
132 | } | |
133 | ||
025faf73 DG |
134 | if (key->filter && event->filter) { |
135 | /* Both filters exists, check length followed by the bytecode. */ | |
136 | if (event->filter->len != key->filter->len || | |
137 | memcmp(event->filter->data, key->filter->data, | |
138 | event->filter->len) != 0) { | |
139 | goto no_match; | |
140 | } | |
18eace3b DG |
141 | } |
142 | ||
1af53eb5 JI |
143 | /* One of the exclusions is NULL, fail. */ |
144 | if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) { | |
145 | goto no_match; | |
146 | } | |
147 | ||
148 | if (key->exclusion && event->exclusion) { | |
149 | /* Both exclusions exists, check count followed by the names. */ | |
150 | if (event->exclusion->count != key->exclusion->count || | |
151 | memcmp(event->exclusion->names, key->exclusion->names, | |
152 | event->exclusion->count * LTTNG_UST_SYM_NAME_LEN) != 0) { | |
153 | goto no_match; | |
154 | } | |
155 | } | |
156 | ||
157 | ||
025faf73 | 158 | /* Match. */ |
18eace3b DG |
159 | return 1; |
160 | ||
161 | no_match: | |
162 | return 0; | |
18eace3b DG |
163 | } |
164 | ||
025faf73 DG |
165 | /* |
166 | * Unique add of an ust app event in the given ht. This uses the custom | |
167 | * ht_match_ust_app_event match function and the event name as hash. | |
168 | */ | |
d0b96690 | 169 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
170 | struct ust_app_event *event) |
171 | { | |
172 | struct cds_lfht_node *node_ptr; | |
173 | struct ust_app_ht_key key; | |
d0b96690 | 174 | struct lttng_ht *ht; |
18eace3b | 175 | |
d0b96690 DG |
176 | assert(ua_chan); |
177 | assert(ua_chan->events); | |
18eace3b DG |
178 | assert(event); |
179 | ||
d0b96690 | 180 | ht = ua_chan->events; |
18eace3b DG |
181 | key.name = event->attr.name; |
182 | key.filter = event->filter; | |
183 | key.loglevel = event->attr.loglevel; | |
91c89f23 | 184 | key.exclusion = event->exclusion; |
18eace3b DG |
185 | |
186 | node_ptr = cds_lfht_add_unique(ht->ht, | |
187 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
188 | ht_match_ust_app_event, &key, &event->node.node); | |
189 | assert(node_ptr == &event->node.node); | |
190 | } | |
191 | ||
d88aee68 DG |
192 | /* |
193 | * Close the notify socket from the given RCU head object. This MUST be called | |
194 | * through a call_rcu(). | |
195 | */ | |
196 | static void close_notify_sock_rcu(struct rcu_head *head) | |
197 | { | |
198 | int ret; | |
199 | struct ust_app_notify_sock_obj *obj = | |
200 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
201 | ||
202 | /* Must have a valid fd here. */ | |
203 | assert(obj->fd >= 0); | |
204 | ||
205 | ret = close(obj->fd); | |
206 | if (ret) { | |
207 | ERR("close notify sock %d RCU", obj->fd); | |
208 | } | |
209 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
210 | ||
211 | free(obj); | |
212 | } | |
213 | ||
7972aab2 DG |
214 | /* |
215 | * Return the session registry according to the buffer type of the given | |
216 | * session. | |
217 | * | |
218 | * A registry per UID object MUST exists before calling this function or else | |
219 | * it assert() if not found. RCU read side lock must be acquired. | |
220 | */ | |
221 | static struct ust_registry_session *get_session_registry( | |
222 | struct ust_app_session *ua_sess) | |
223 | { | |
224 | struct ust_registry_session *registry = NULL; | |
225 | ||
226 | assert(ua_sess); | |
227 | ||
228 | switch (ua_sess->buffer_type) { | |
229 | case LTTNG_BUFFER_PER_PID: | |
230 | { | |
231 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
232 | if (!reg_pid) { | |
233 | goto error; | |
234 | } | |
235 | registry = reg_pid->registry->reg.ust; | |
236 | break; | |
237 | } | |
238 | case LTTNG_BUFFER_PER_UID: | |
239 | { | |
240 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
241 | ua_sess->tracing_id, ua_sess->bits_per_long, ua_sess->uid); | |
242 | if (!reg_uid) { | |
243 | goto error; | |
244 | } | |
245 | registry = reg_uid->registry->reg.ust; | |
246 | break; | |
247 | } | |
248 | default: | |
249 | assert(0); | |
250 | }; | |
251 | ||
252 | error: | |
253 | return registry; | |
254 | } | |
255 | ||
55cc08a6 DG |
256 | /* |
257 | * Delete ust context safely. RCU read lock must be held before calling | |
258 | * this function. | |
259 | */ | |
260 | static | |
261 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx) | |
262 | { | |
ffe60014 DG |
263 | int ret; |
264 | ||
265 | assert(ua_ctx); | |
266 | ||
55cc08a6 | 267 | if (ua_ctx->obj) { |
ffe60014 | 268 | ret = ustctl_release_object(sock, ua_ctx->obj); |
d0b96690 DG |
269 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
270 | ERR("UST app sock %d release ctx obj handle %d failed with ret %d", | |
271 | sock, ua_ctx->obj->handle, ret); | |
ffe60014 | 272 | } |
55cc08a6 DG |
273 | free(ua_ctx->obj); |
274 | } | |
275 | free(ua_ctx); | |
276 | } | |
277 | ||
d80a6244 DG |
278 | /* |
279 | * Delete ust app event safely. RCU read lock must be held before calling | |
280 | * this function. | |
281 | */ | |
8b366481 DG |
282 | static |
283 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event) | |
d80a6244 | 284 | { |
ffe60014 DG |
285 | int ret; |
286 | ||
287 | assert(ua_event); | |
288 | ||
53a80697 | 289 | free(ua_event->filter); |
951f0b71 JI |
290 | if (ua_event->exclusion != NULL) |
291 | free(ua_event->exclusion); | |
edb67388 | 292 | if (ua_event->obj != NULL) { |
ffe60014 DG |
293 | ret = ustctl_release_object(sock, ua_event->obj); |
294 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
295 | ERR("UST app sock %d release event obj failed with ret %d", | |
296 | sock, ret); | |
297 | } | |
edb67388 DG |
298 | free(ua_event->obj); |
299 | } | |
d80a6244 DG |
300 | free(ua_event); |
301 | } | |
302 | ||
303 | /* | |
7972aab2 DG |
304 | * Release ust data object of the given stream. |
305 | * | |
306 | * Return 0 on success or else a negative value. | |
d80a6244 | 307 | */ |
7972aab2 | 308 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream) |
d80a6244 | 309 | { |
7972aab2 | 310 | int ret = 0; |
ffe60014 DG |
311 | |
312 | assert(stream); | |
313 | ||
8b366481 | 314 | if (stream->obj) { |
ffe60014 DG |
315 | ret = ustctl_release_object(sock, stream->obj); |
316 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
317 | ERR("UST app sock %d release stream obj failed with ret %d", | |
318 | sock, ret); | |
319 | } | |
4063050c | 320 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
321 | free(stream->obj); |
322 | } | |
7972aab2 DG |
323 | |
324 | return ret; | |
325 | } | |
326 | ||
327 | /* | |
328 | * Delete ust app stream safely. RCU read lock must be held before calling | |
329 | * this function. | |
330 | */ | |
331 | static | |
332 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream) | |
333 | { | |
334 | assert(stream); | |
335 | ||
336 | (void) release_ust_app_stream(sock, stream); | |
84cd17c6 | 337 | free(stream); |
d80a6244 DG |
338 | } |
339 | ||
36b588ed MD |
340 | /* |
341 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
342 | * section and outside of call_rcu thread, so we postpone its execution |
343 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
344 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
345 | */ |
346 | static | |
347 | void delete_ust_app_channel_rcu(struct rcu_head *head) | |
348 | { | |
349 | struct ust_app_channel *ua_chan = | |
350 | caa_container_of(head, struct ust_app_channel, rcu_head); | |
351 | ||
0b2dc8df MD |
352 | ht_cleanup_push(ua_chan->ctx); |
353 | ht_cleanup_push(ua_chan->events); | |
36b588ed MD |
354 | free(ua_chan); |
355 | } | |
356 | ||
d80a6244 DG |
357 | /* |
358 | * Delete ust app channel safely. RCU read lock must be held before calling | |
359 | * this function. | |
360 | */ | |
8b366481 | 361 | static |
d0b96690 DG |
362 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
363 | struct ust_app *app) | |
d80a6244 DG |
364 | { |
365 | int ret; | |
bec39940 | 366 | struct lttng_ht_iter iter; |
d80a6244 | 367 | struct ust_app_event *ua_event; |
55cc08a6 | 368 | struct ust_app_ctx *ua_ctx; |
030a66fa | 369 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 370 | struct ust_registry_session *registry; |
d80a6244 | 371 | |
ffe60014 DG |
372 | assert(ua_chan); |
373 | ||
374 | DBG3("UST app deleting channel %s", ua_chan->name); | |
375 | ||
55cc08a6 | 376 | /* Wipe stream */ |
d80a6244 | 377 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 378 | cds_list_del(&stream->list); |
d80a6244 DG |
379 | delete_ust_app_stream(sock, stream); |
380 | } | |
381 | ||
55cc08a6 | 382 | /* Wipe context */ |
bec39940 | 383 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
31746f93 | 384 | cds_list_del(&ua_ctx->list); |
bec39940 | 385 | ret = lttng_ht_del(ua_chan->ctx, &iter); |
55cc08a6 DG |
386 | assert(!ret); |
387 | delete_ust_app_ctx(sock, ua_ctx); | |
388 | } | |
d80a6244 | 389 | |
55cc08a6 | 390 | /* Wipe events */ |
bec39940 DG |
391 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
392 | node.node) { | |
393 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 394 | assert(!ret); |
d80a6244 DG |
395 | delete_ust_app_event(sock, ua_event); |
396 | } | |
edb67388 | 397 | |
c8335706 MD |
398 | if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) { |
399 | /* Wipe and free registry from session registry. */ | |
400 | registry = get_session_registry(ua_chan->session); | |
401 | if (registry) { | |
402 | ust_registry_channel_del_free(registry, ua_chan->key); | |
403 | } | |
7972aab2 | 404 | } |
d0b96690 | 405 | |
edb67388 | 406 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
407 | /* Remove channel from application UST object descriptor. */ |
408 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
409 | lttng_ht_del(app->ust_objd, &iter); | |
ffe60014 DG |
410 | ret = ustctl_release_object(sock, ua_chan->obj); |
411 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
412 | ERR("UST app sock %d release channel obj failed with ret %d", | |
413 | sock, ret); | |
414 | } | |
7972aab2 | 415 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
416 | free(ua_chan->obj); |
417 | } | |
36b588ed | 418 | call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); |
d80a6244 DG |
419 | } |
420 | ||
331744e3 | 421 | /* |
1b532a60 DG |
422 | * Push metadata to consumer socket. |
423 | * | |
424 | * The socket lock MUST be acquired. | |
425 | * The ust app session lock MUST be acquired. | |
331744e3 JD |
426 | * |
427 | * On success, return the len of metadata pushed or else a negative value. | |
428 | */ | |
429 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
430 | struct consumer_socket *socket, int send_zero_data) | |
431 | { | |
432 | int ret; | |
433 | char *metadata_str = NULL; | |
434 | size_t len, offset; | |
435 | ssize_t ret_val; | |
436 | ||
437 | assert(registry); | |
438 | assert(socket); | |
1b532a60 DG |
439 | |
440 | /* | |
441 | * On a push metadata error either the consumer is dead or the metadata | |
442 | * channel has been destroyed because its endpoint might have died (e.g: | |
443 | * relayd). If so, the metadata closed flag is set to 1 so we deny pushing | |
444 | * metadata again which is not valid anymore on the consumer side. | |
445 | * | |
446 | * The ust app session mutex locked allows us to make this check without | |
447 | * the registry lock. | |
448 | */ | |
449 | if (registry->metadata_closed) { | |
450 | return -EPIPE; | |
451 | } | |
331744e3 JD |
452 | |
453 | pthread_mutex_lock(®istry->lock); | |
454 | ||
455 | offset = registry->metadata_len_sent; | |
456 | len = registry->metadata_len - registry->metadata_len_sent; | |
457 | if (len == 0) { | |
458 | DBG3("No metadata to push for metadata key %" PRIu64, | |
459 | registry->metadata_key); | |
460 | ret_val = len; | |
461 | if (send_zero_data) { | |
462 | DBG("No metadata to push"); | |
463 | goto push_data; | |
464 | } | |
465 | goto end; | |
466 | } | |
467 | ||
468 | /* Allocate only what we have to send. */ | |
469 | metadata_str = zmalloc(len); | |
470 | if (!metadata_str) { | |
471 | PERROR("zmalloc ust app metadata string"); | |
472 | ret_val = -ENOMEM; | |
473 | goto error; | |
474 | } | |
475 | /* Copy what we haven't send out. */ | |
476 | memcpy(metadata_str, registry->metadata + offset, len); | |
477 | registry->metadata_len_sent += len; | |
478 | ||
479 | push_data: | |
480 | pthread_mutex_unlock(®istry->lock); | |
481 | ret = consumer_push_metadata(socket, registry->metadata_key, | |
482 | metadata_str, len, offset); | |
483 | if (ret < 0) { | |
000baf6a DG |
484 | /* |
485 | * There is an acceptable race here between the registry metadata key | |
486 | * assignment and the creation on the consumer. The session daemon can | |
487 | * concurrently push metadata for this registry while being created on | |
488 | * the consumer since the metadata key of the registry is assigned | |
489 | * *before* it is setup to avoid the consumer to ask for metadata that | |
490 | * could possibly be not found in the session daemon. | |
491 | * | |
492 | * The metadata will get pushed either by the session being stopped or | |
493 | * the consumer requesting metadata if that race is triggered. | |
494 | */ | |
495 | if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) { | |
496 | ret = 0; | |
497 | } | |
331744e3 JD |
498 | ret_val = ret; |
499 | goto error_push; | |
500 | } | |
501 | ||
502 | free(metadata_str); | |
503 | return len; | |
504 | ||
505 | end: | |
506 | error: | |
507 | pthread_mutex_unlock(®istry->lock); | |
508 | error_push: | |
509 | free(metadata_str); | |
510 | return ret_val; | |
511 | } | |
512 | ||
d88aee68 DG |
513 | /* |
514 | * For a given application and session, push metadata to consumer. The session | |
515 | * lock MUST be acquired here before calling this. | |
331744e3 JD |
516 | * Either sock or consumer is required : if sock is NULL, the default |
517 | * socket to send the metadata is retrieved from consumer, if sock | |
518 | * is not NULL we use it to send the metadata. | |
d88aee68 DG |
519 | * |
520 | * Return 0 on success else a negative error. | |
521 | */ | |
7972aab2 DG |
522 | static int push_metadata(struct ust_registry_session *registry, |
523 | struct consumer_output *consumer) | |
d88aee68 | 524 | { |
331744e3 JD |
525 | int ret_val; |
526 | ssize_t ret; | |
d88aee68 DG |
527 | struct consumer_socket *socket; |
528 | ||
7972aab2 DG |
529 | assert(registry); |
530 | assert(consumer); | |
531 | ||
532 | rcu_read_lock(); | |
d88aee68 | 533 | |
7972aab2 DG |
534 | /* |
535 | * Means that no metadata was assigned to the session. This can happens if | |
536 | * no start has been done previously. | |
537 | */ | |
538 | if (!registry->metadata_key) { | |
331744e3 | 539 | ret_val = 0; |
1b532a60 | 540 | goto end_rcu_unlock; |
d88aee68 DG |
541 | } |
542 | ||
d88aee68 | 543 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
544 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
545 | consumer); | |
d88aee68 | 546 | if (!socket) { |
331744e3 | 547 | ret_val = -1; |
d88aee68 DG |
548 | goto error_rcu_unlock; |
549 | } | |
550 | ||
551 | /* | |
552 | * TODO: Currently, we hold the socket lock around sampling of the next | |
553 | * metadata segment to ensure we send metadata over the consumer socket in | |
554 | * the correct order. This makes the registry lock nest inside the socket | |
555 | * lock. | |
556 | * | |
557 | * Please note that this is a temporary measure: we should move this lock | |
558 | * back into ust_consumer_push_metadata() when the consumer gets the | |
559 | * ability to reorder the metadata it receives. | |
560 | */ | |
561 | pthread_mutex_lock(socket->lock); | |
331744e3 JD |
562 | ret = ust_app_push_metadata(registry, socket, 0); |
563 | pthread_mutex_unlock(socket->lock); | |
d88aee68 | 564 | if (ret < 0) { |
331744e3 | 565 | ret_val = ret; |
d88aee68 DG |
566 | goto error_rcu_unlock; |
567 | } | |
568 | ||
d88aee68 | 569 | rcu_read_unlock(); |
d88aee68 DG |
570 | return 0; |
571 | ||
d88aee68 | 572 | error_rcu_unlock: |
1b532a60 DG |
573 | /* |
574 | * On error, flag the registry that the metadata is closed. We were unable | |
575 | * to push anything and this means that either the consumer is not | |
576 | * responding or the metadata cache has been destroyed on the consumer. | |
577 | */ | |
578 | registry->metadata_closed = 1; | |
579 | end_rcu_unlock: | |
d88aee68 | 580 | rcu_read_unlock(); |
331744e3 | 581 | return ret_val; |
d88aee68 DG |
582 | } |
583 | ||
584 | /* | |
585 | * Send to the consumer a close metadata command for the given session. Once | |
586 | * done, the metadata channel is deleted and the session metadata pointer is | |
587 | * nullified. The session lock MUST be acquired here unless the application is | |
588 | * in the destroy path. | |
589 | * | |
590 | * Return 0 on success else a negative value. | |
591 | */ | |
7972aab2 DG |
592 | static int close_metadata(struct ust_registry_session *registry, |
593 | struct consumer_output *consumer) | |
d88aee68 DG |
594 | { |
595 | int ret; | |
596 | struct consumer_socket *socket; | |
597 | ||
7972aab2 DG |
598 | assert(registry); |
599 | assert(consumer); | |
d88aee68 | 600 | |
7972aab2 DG |
601 | rcu_read_lock(); |
602 | ||
603 | if (!registry->metadata_key || registry->metadata_closed) { | |
d88aee68 | 604 | ret = 0; |
1b532a60 | 605 | goto end; |
d88aee68 DG |
606 | } |
607 | ||
d88aee68 | 608 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
609 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
610 | consumer); | |
d88aee68 DG |
611 | if (!socket) { |
612 | ret = -1; | |
7972aab2 | 613 | goto error; |
d88aee68 DG |
614 | } |
615 | ||
7972aab2 | 616 | ret = consumer_close_metadata(socket, registry->metadata_key); |
d88aee68 | 617 | if (ret < 0) { |
7972aab2 | 618 | goto error; |
d88aee68 DG |
619 | } |
620 | ||
d88aee68 | 621 | error: |
1b532a60 DG |
622 | /* |
623 | * Metadata closed. Even on error this means that the consumer is not | |
624 | * responding or not found so either way a second close should NOT be emit | |
625 | * for this registry. | |
626 | */ | |
627 | registry->metadata_closed = 1; | |
628 | end: | |
7972aab2 | 629 | rcu_read_unlock(); |
d88aee68 DG |
630 | return ret; |
631 | } | |
632 | ||
36b588ed MD |
633 | /* |
634 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
635 | * section and outside of call_rcu thread, so we postpone its execution |
636 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
637 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
638 | */ |
639 | static | |
640 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
641 | { | |
642 | struct ust_app_session *ua_sess = | |
643 | caa_container_of(head, struct ust_app_session, rcu_head); | |
644 | ||
0b2dc8df | 645 | ht_cleanup_push(ua_sess->channels); |
36b588ed MD |
646 | free(ua_sess); |
647 | } | |
648 | ||
d80a6244 DG |
649 | /* |
650 | * Delete ust app session safely. RCU read lock must be held before calling | |
651 | * this function. | |
652 | */ | |
8b366481 | 653 | static |
d0b96690 DG |
654 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
655 | struct ust_app *app) | |
d80a6244 DG |
656 | { |
657 | int ret; | |
bec39940 | 658 | struct lttng_ht_iter iter; |
d80a6244 | 659 | struct ust_app_channel *ua_chan; |
7972aab2 | 660 | struct ust_registry_session *registry; |
d80a6244 | 661 | |
d88aee68 DG |
662 | assert(ua_sess); |
663 | ||
1b532a60 DG |
664 | pthread_mutex_lock(&ua_sess->lock); |
665 | ||
7972aab2 | 666 | registry = get_session_registry(ua_sess); |
1b532a60 | 667 | if (registry && !registry->metadata_closed) { |
d88aee68 | 668 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 669 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 670 | |
7972aab2 DG |
671 | /* |
672 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
673 | * metadata only on destroy trace session in this case. Also, the |
674 | * previous push metadata could have flag the metadata registry to | |
675 | * close so don't send a close command if closed. | |
7972aab2 | 676 | */ |
1b532a60 DG |
677 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID && |
678 | !registry->metadata_closed) { | |
7972aab2 DG |
679 | /* And ask to close it for this session registry. */ |
680 | (void) close_metadata(registry, ua_sess->consumer); | |
681 | } | |
d80a6244 DG |
682 | } |
683 | ||
bec39940 DG |
684 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
685 | node.node) { | |
686 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 687 | assert(!ret); |
d0b96690 | 688 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 689 | } |
d80a6244 | 690 | |
7972aab2 DG |
691 | /* In case of per PID, the registry is kept in the session. */ |
692 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
693 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
694 | if (reg_pid) { | |
695 | buffer_reg_pid_remove(reg_pid); | |
696 | buffer_reg_pid_destroy(reg_pid); | |
697 | } | |
698 | } | |
d0b96690 | 699 | |
aee6bafd | 700 | if (ua_sess->handle != -1) { |
ffe60014 DG |
701 | ret = ustctl_release_handle(sock, ua_sess->handle); |
702 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
703 | ERR("UST app sock %d release session handle failed with ret %d", | |
704 | sock, ret); | |
705 | } | |
aee6bafd | 706 | } |
1b532a60 DG |
707 | pthread_mutex_unlock(&ua_sess->lock); |
708 | ||
36b588ed | 709 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 710 | } |
91d76f53 DG |
711 | |
712 | /* | |
284d8f55 DG |
713 | * Delete a traceable application structure from the global list. Never call |
714 | * this function outside of a call_rcu call. | |
36b588ed MD |
715 | * |
716 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 717 | */ |
8b366481 DG |
718 | static |
719 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 720 | { |
8b366481 | 721 | int ret, sock; |
d42f20df | 722 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 723 | |
d80a6244 | 724 | /* Delete ust app sessions info */ |
852d0037 DG |
725 | sock = app->sock; |
726 | app->sock = -1; | |
d80a6244 | 727 | |
8b366481 | 728 | /* Wipe sessions */ |
d42f20df DG |
729 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
730 | teardown_node) { | |
731 | /* Free every object in the session and the session. */ | |
36b588ed | 732 | rcu_read_lock(); |
d0b96690 | 733 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 734 | rcu_read_unlock(); |
d80a6244 | 735 | } |
36b588ed | 736 | |
0b2dc8df MD |
737 | ht_cleanup_push(app->sessions); |
738 | ht_cleanup_push(app->ust_objd); | |
d80a6244 | 739 | |
6414a713 | 740 | /* |
852d0037 DG |
741 | * Wait until we have deleted the application from the sock hash table |
742 | * before closing this socket, otherwise an application could re-use the | |
743 | * socket ID and race with the teardown, using the same hash table entry. | |
744 | * | |
745 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
746 | * all RCU readers that could run concurrently with unregister app, | |
747 | * therefore we _need_ to only close that socket after a grace period. So | |
748 | * it should stay in this RCU callback. | |
749 | * | |
750 | * This close() is a very important step of the synchronization model so | |
751 | * every modification to this function must be carefully reviewed. | |
6414a713 | 752 | */ |
799e2c4f MD |
753 | ret = close(sock); |
754 | if (ret) { | |
755 | PERROR("close"); | |
756 | } | |
4063050c | 757 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 758 | |
852d0037 | 759 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 760 | free(app); |
099e26bd DG |
761 | } |
762 | ||
763 | /* | |
f6a9efaa | 764 | * URCU intermediate call to delete an UST app. |
099e26bd | 765 | */ |
8b366481 DG |
766 | static |
767 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 768 | { |
bec39940 DG |
769 | struct lttng_ht_node_ulong *node = |
770 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 771 | struct ust_app *app = |
852d0037 | 772 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 773 | |
852d0037 | 774 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 775 | delete_ust_app(app); |
099e26bd DG |
776 | } |
777 | ||
ffe60014 DG |
778 | /* |
779 | * Delete the session from the application ht and delete the data structure by | |
780 | * freeing every object inside and releasing them. | |
781 | */ | |
d0b96690 | 782 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
783 | struct ust_app_session *ua_sess) |
784 | { | |
785 | int ret; | |
786 | struct lttng_ht_iter iter; | |
787 | ||
788 | assert(app); | |
789 | assert(ua_sess); | |
790 | ||
791 | iter.iter.node = &ua_sess->node.node; | |
792 | ret = lttng_ht_del(app->sessions, &iter); | |
793 | if (ret) { | |
794 | /* Already scheduled for teardown. */ | |
795 | goto end; | |
796 | } | |
797 | ||
798 | /* Once deleted, free the data structure. */ | |
d0b96690 | 799 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
800 | |
801 | end: | |
802 | return; | |
803 | } | |
804 | ||
8b366481 DG |
805 | /* |
806 | * Alloc new UST app session. | |
807 | */ | |
808 | static | |
d0b96690 | 809 | struct ust_app_session *alloc_ust_app_session(struct ust_app *app) |
8b366481 DG |
810 | { |
811 | struct ust_app_session *ua_sess; | |
812 | ||
813 | /* Init most of the default value by allocating and zeroing */ | |
814 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
815 | if (ua_sess == NULL) { | |
816 | PERROR("malloc"); | |
ffe60014 | 817 | goto error_free; |
8b366481 DG |
818 | } |
819 | ||
820 | ua_sess->handle = -1; | |
bec39940 | 821 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
d0b96690 | 822 | pthread_mutex_init(&ua_sess->lock, NULL); |
ffe60014 | 823 | |
8b366481 DG |
824 | return ua_sess; |
825 | ||
ffe60014 | 826 | error_free: |
8b366481 DG |
827 | return NULL; |
828 | } | |
829 | ||
830 | /* | |
831 | * Alloc new UST app channel. | |
832 | */ | |
833 | static | |
834 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 835 | struct ust_app_session *ua_sess, |
ffe60014 | 836 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
837 | { |
838 | struct ust_app_channel *ua_chan; | |
839 | ||
840 | /* Init most of the default value by allocating and zeroing */ | |
841 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
842 | if (ua_chan == NULL) { | |
843 | PERROR("malloc"); | |
844 | goto error; | |
845 | } | |
846 | ||
847 | /* Setup channel name */ | |
848 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
849 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
850 | ||
851 | ua_chan->enabled = 1; | |
852 | ua_chan->handle = -1; | |
45893984 | 853 | ua_chan->session = ua_sess; |
ffe60014 | 854 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
855 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
856 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
857 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
858 | |
859 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
31746f93 | 860 | CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); |
8b366481 DG |
861 | |
862 | /* Copy attributes */ | |
863 | if (attr) { | |
ffe60014 | 864 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
865 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
866 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
867 | ua_chan->attr.overwrite = attr->overwrite; | |
868 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
869 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
870 | ua_chan->attr.output = attr->output; | |
8b366481 | 871 | } |
ffe60014 DG |
872 | /* By default, the channel is a per cpu channel. */ |
873 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
874 | |
875 | DBG3("UST app channel %s allocated", ua_chan->name); | |
876 | ||
877 | return ua_chan; | |
878 | ||
879 | error: | |
880 | return NULL; | |
881 | } | |
882 | ||
37f1c236 DG |
883 | /* |
884 | * Allocate and initialize a UST app stream. | |
885 | * | |
886 | * Return newly allocated stream pointer or NULL on error. | |
887 | */ | |
ffe60014 | 888 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
889 | { |
890 | struct ust_app_stream *stream = NULL; | |
891 | ||
892 | stream = zmalloc(sizeof(*stream)); | |
893 | if (stream == NULL) { | |
894 | PERROR("zmalloc ust app stream"); | |
895 | goto error; | |
896 | } | |
897 | ||
898 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
899 | stream->handle = -1; | |
900 | ||
901 | error: | |
902 | return stream; | |
903 | } | |
904 | ||
8b366481 DG |
905 | /* |
906 | * Alloc new UST app event. | |
907 | */ | |
908 | static | |
909 | struct ust_app_event *alloc_ust_app_event(char *name, | |
910 | struct lttng_ust_event *attr) | |
911 | { | |
912 | struct ust_app_event *ua_event; | |
913 | ||
914 | /* Init most of the default value by allocating and zeroing */ | |
915 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
916 | if (ua_event == NULL) { | |
917 | PERROR("malloc"); | |
918 | goto error; | |
919 | } | |
920 | ||
921 | ua_event->enabled = 1; | |
922 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
923 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 924 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
925 | |
926 | /* Copy attributes */ | |
927 | if (attr) { | |
928 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
929 | } | |
930 | ||
931 | DBG3("UST app event %s allocated", ua_event->name); | |
932 | ||
933 | return ua_event; | |
934 | ||
935 | error: | |
936 | return NULL; | |
937 | } | |
938 | ||
939 | /* | |
940 | * Alloc new UST app context. | |
941 | */ | |
942 | static | |
943 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx) | |
944 | { | |
945 | struct ust_app_ctx *ua_ctx; | |
946 | ||
947 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
948 | if (ua_ctx == NULL) { | |
949 | goto error; | |
950 | } | |
951 | ||
31746f93 DG |
952 | CDS_INIT_LIST_HEAD(&ua_ctx->list); |
953 | ||
8b366481 DG |
954 | if (uctx) { |
955 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
956 | } | |
957 | ||
958 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
959 | ||
960 | error: | |
961 | return ua_ctx; | |
962 | } | |
963 | ||
025faf73 DG |
964 | /* |
965 | * Allocate a filter and copy the given original filter. | |
966 | * | |
967 | * Return allocated filter or NULL on error. | |
968 | */ | |
969 | static struct lttng_ust_filter_bytecode *alloc_copy_ust_app_filter( | |
970 | struct lttng_ust_filter_bytecode *orig_f) | |
971 | { | |
972 | struct lttng_ust_filter_bytecode *filter = NULL; | |
973 | ||
974 | /* Copy filter bytecode */ | |
975 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
976 | if (!filter) { | |
977 | PERROR("zmalloc alloc ust app filter"); | |
978 | goto error; | |
979 | } | |
980 | ||
981 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
982 | ||
983 | error: | |
984 | return filter; | |
985 | } | |
986 | ||
099e26bd | 987 | /* |
421cb601 DG |
988 | * Find an ust_app using the sock and return it. RCU read side lock must be |
989 | * held before calling this helper function. | |
099e26bd | 990 | */ |
f20baf8e | 991 | struct ust_app *ust_app_find_by_sock(int sock) |
099e26bd | 992 | { |
bec39940 | 993 | struct lttng_ht_node_ulong *node; |
bec39940 | 994 | struct lttng_ht_iter iter; |
f6a9efaa | 995 | |
852d0037 | 996 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 997 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
998 | if (node == NULL) { |
999 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
1000 | goto error; |
1001 | } | |
852d0037 DG |
1002 | |
1003 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
1004 | |
1005 | error: | |
1006 | return NULL; | |
099e26bd DG |
1007 | } |
1008 | ||
d0b96690 DG |
1009 | /* |
1010 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
1011 | * be held before calling this helper function. | |
1012 | */ | |
1013 | static struct ust_app *find_app_by_notify_sock(int sock) | |
1014 | { | |
1015 | struct lttng_ht_node_ulong *node; | |
1016 | struct lttng_ht_iter iter; | |
1017 | ||
1018 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
1019 | &iter); | |
1020 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1021 | if (node == NULL) { | |
1022 | DBG2("UST app find by notify sock %d not found", sock); | |
1023 | goto error; | |
1024 | } | |
1025 | ||
1026 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
1027 | ||
1028 | error: | |
1029 | return NULL; | |
1030 | } | |
1031 | ||
025faf73 DG |
1032 | /* |
1033 | * Lookup for an ust app event based on event name, filter bytecode and the | |
1034 | * event loglevel. | |
1035 | * | |
1036 | * Return an ust_app_event object or NULL on error. | |
1037 | */ | |
18eace3b | 1038 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
39c5a3a7 JI |
1039 | char *name, struct lttng_ust_filter_bytecode *filter, int loglevel, |
1040 | const struct lttng_event_exclusion *exclusion) | |
18eace3b DG |
1041 | { |
1042 | struct lttng_ht_iter iter; | |
1043 | struct lttng_ht_node_str *node; | |
1044 | struct ust_app_event *event = NULL; | |
1045 | struct ust_app_ht_key key; | |
18eace3b DG |
1046 | |
1047 | assert(name); | |
1048 | assert(ht); | |
1049 | ||
1050 | /* Setup key for event lookup. */ | |
1051 | key.name = name; | |
1052 | key.filter = filter; | |
1053 | key.loglevel = loglevel; | |
39c5a3a7 JI |
1054 | /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */ |
1055 | key.exclusion = (struct lttng_ust_event_exclusion *)exclusion; | |
18eace3b | 1056 | |
025faf73 DG |
1057 | /* Lookup using the event name as hash and a custom match fct. */ |
1058 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1059 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1060 | node = lttng_ht_iter_get_node_str(&iter); |
1061 | if (node == NULL) { | |
1062 | goto end; | |
1063 | } | |
1064 | ||
1065 | event = caa_container_of(node, struct ust_app_event, node); | |
1066 | ||
1067 | end: | |
18eace3b DG |
1068 | return event; |
1069 | } | |
1070 | ||
55cc08a6 DG |
1071 | /* |
1072 | * Create the channel context on the tracer. | |
d0b96690 DG |
1073 | * |
1074 | * Called with UST app session lock held. | |
55cc08a6 DG |
1075 | */ |
1076 | static | |
1077 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1078 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1079 | { | |
1080 | int ret; | |
1081 | ||
840cb59c | 1082 | health_code_update(); |
86acf0da | 1083 | |
852d0037 | 1084 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 DG |
1085 | ua_chan->obj, &ua_ctx->obj); |
1086 | if (ret < 0) { | |
ffe60014 DG |
1087 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1088 | ERR("UST app create channel context failed for app (pid: %d) " | |
1089 | "with ret %d", app->pid, ret); | |
1090 | } else { | |
3757b385 DG |
1091 | /* |
1092 | * This is normal behavior, an application can die during the | |
1093 | * creation process. Don't report an error so the execution can | |
1094 | * continue normally. | |
1095 | */ | |
1096 | ret = 0; | |
ffe60014 DG |
1097 | DBG3("UST app disable event failed. Application is dead."); |
1098 | } | |
55cc08a6 DG |
1099 | goto error; |
1100 | } | |
1101 | ||
1102 | ua_ctx->handle = ua_ctx->obj->handle; | |
1103 | ||
d0b96690 DG |
1104 | DBG2("UST app context handle %d created successfully for channel %s", |
1105 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1106 | |
1107 | error: | |
840cb59c | 1108 | health_code_update(); |
55cc08a6 DG |
1109 | return ret; |
1110 | } | |
1111 | ||
53a80697 MD |
1112 | /* |
1113 | * Set the filter on the tracer. | |
1114 | */ | |
1115 | static | |
1116 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
1117 | struct ust_app *app) | |
1118 | { | |
1119 | int ret; | |
1120 | ||
840cb59c | 1121 | health_code_update(); |
86acf0da | 1122 | |
53a80697 | 1123 | if (!ua_event->filter) { |
86acf0da DG |
1124 | ret = 0; |
1125 | goto error; | |
53a80697 MD |
1126 | } |
1127 | ||
1128 | ret = ustctl_set_filter(app->sock, ua_event->filter, | |
1129 | ua_event->obj); | |
1130 | if (ret < 0) { | |
ffe60014 DG |
1131 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1132 | ERR("UST app event %s filter failed for app (pid: %d) " | |
1133 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1134 | } else { | |
3757b385 DG |
1135 | /* |
1136 | * This is normal behavior, an application can die during the | |
1137 | * creation process. Don't report an error so the execution can | |
1138 | * continue normally. | |
1139 | */ | |
1140 | ret = 0; | |
ffe60014 DG |
1141 | DBG3("UST app filter event failed. Application is dead."); |
1142 | } | |
53a80697 MD |
1143 | goto error; |
1144 | } | |
1145 | ||
1146 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
1147 | ||
1148 | error: | |
840cb59c | 1149 | health_code_update(); |
53a80697 MD |
1150 | return ret; |
1151 | } | |
1152 | ||
7cc9a73c JI |
1153 | /* |
1154 | * Set event exclusions on the tracer. | |
1155 | */ | |
1156 | static | |
1157 | int set_ust_event_exclusion(struct ust_app_event *ua_event, | |
1158 | struct ust_app *app) | |
1159 | { | |
1160 | int ret; | |
1161 | ||
1162 | health_code_update(); | |
1163 | ||
1164 | if (!ua_event->exclusion || !ua_event->exclusion->count) { | |
1165 | ret = 0; | |
1166 | goto error; | |
1167 | } | |
1168 | ||
1169 | ret = ustctl_set_exclusion(app->sock, ua_event->exclusion, | |
1170 | ua_event->obj); | |
1171 | if (ret < 0) { | |
1172 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1173 | ERR("UST app event %s exclusions failed for app (pid: %d) " | |
1174 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1175 | } else { | |
1176 | /* | |
1177 | * This is normal behavior, an application can die during the | |
1178 | * creation process. Don't report an error so the execution can | |
1179 | * continue normally. | |
1180 | */ | |
1181 | ret = 0; | |
1182 | DBG3("UST app event exclusion failed. Application is dead."); | |
1183 | } | |
1184 | goto error; | |
1185 | } | |
1186 | ||
1187 | DBG2("UST exclusion set successfully for event %s", ua_event->name); | |
1188 | ||
1189 | error: | |
1190 | health_code_update(); | |
1191 | return ret; | |
1192 | } | |
1193 | ||
9730260e DG |
1194 | /* |
1195 | * Disable the specified event on to UST tracer for the UST session. | |
1196 | */ | |
1197 | static int disable_ust_event(struct ust_app *app, | |
1198 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1199 | { | |
1200 | int ret; | |
1201 | ||
840cb59c | 1202 | health_code_update(); |
86acf0da | 1203 | |
852d0037 | 1204 | ret = ustctl_disable(app->sock, ua_event->obj); |
9730260e | 1205 | if (ret < 0) { |
ffe60014 DG |
1206 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1207 | ERR("UST app event %s disable failed for app (pid: %d) " | |
1208 | "and session handle %d with ret %d", | |
1209 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1210 | } else { | |
3757b385 DG |
1211 | /* |
1212 | * This is normal behavior, an application can die during the | |
1213 | * creation process. Don't report an error so the execution can | |
1214 | * continue normally. | |
1215 | */ | |
1216 | ret = 0; | |
ffe60014 DG |
1217 | DBG3("UST app disable event failed. Application is dead."); |
1218 | } | |
9730260e DG |
1219 | goto error; |
1220 | } | |
1221 | ||
1222 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 1223 | ua_event->attr.name, app->pid); |
9730260e DG |
1224 | |
1225 | error: | |
840cb59c | 1226 | health_code_update(); |
9730260e DG |
1227 | return ret; |
1228 | } | |
1229 | ||
78f0bacd DG |
1230 | /* |
1231 | * Disable the specified channel on to UST tracer for the UST session. | |
1232 | */ | |
1233 | static int disable_ust_channel(struct ust_app *app, | |
1234 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1235 | { | |
1236 | int ret; | |
1237 | ||
840cb59c | 1238 | health_code_update(); |
86acf0da | 1239 | |
852d0037 | 1240 | ret = ustctl_disable(app->sock, ua_chan->obj); |
78f0bacd | 1241 | if (ret < 0) { |
ffe60014 DG |
1242 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1243 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1244 | "and session handle %d with ret %d", | |
1245 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1246 | } else { | |
3757b385 DG |
1247 | /* |
1248 | * This is normal behavior, an application can die during the | |
1249 | * creation process. Don't report an error so the execution can | |
1250 | * continue normally. | |
1251 | */ | |
1252 | ret = 0; | |
ffe60014 DG |
1253 | DBG3("UST app disable channel failed. Application is dead."); |
1254 | } | |
78f0bacd DG |
1255 | goto error; |
1256 | } | |
1257 | ||
78f0bacd | 1258 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1259 | ua_chan->name, app->pid); |
78f0bacd DG |
1260 | |
1261 | error: | |
840cb59c | 1262 | health_code_update(); |
78f0bacd DG |
1263 | return ret; |
1264 | } | |
1265 | ||
1266 | /* | |
1267 | * Enable the specified channel on to UST tracer for the UST session. | |
1268 | */ | |
1269 | static int enable_ust_channel(struct ust_app *app, | |
1270 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1271 | { | |
1272 | int ret; | |
1273 | ||
840cb59c | 1274 | health_code_update(); |
86acf0da | 1275 | |
852d0037 | 1276 | ret = ustctl_enable(app->sock, ua_chan->obj); |
78f0bacd | 1277 | if (ret < 0) { |
ffe60014 DG |
1278 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1279 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1280 | "and session handle %d with ret %d", | |
1281 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1282 | } else { | |
3757b385 DG |
1283 | /* |
1284 | * This is normal behavior, an application can die during the | |
1285 | * creation process. Don't report an error so the execution can | |
1286 | * continue normally. | |
1287 | */ | |
1288 | ret = 0; | |
ffe60014 DG |
1289 | DBG3("UST app enable channel failed. Application is dead."); |
1290 | } | |
78f0bacd DG |
1291 | goto error; |
1292 | } | |
1293 | ||
1294 | ua_chan->enabled = 1; | |
1295 | ||
1296 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1297 | ua_chan->name, app->pid); |
78f0bacd DG |
1298 | |
1299 | error: | |
840cb59c | 1300 | health_code_update(); |
78f0bacd DG |
1301 | return ret; |
1302 | } | |
1303 | ||
edb67388 DG |
1304 | /* |
1305 | * Enable the specified event on to UST tracer for the UST session. | |
1306 | */ | |
1307 | static int enable_ust_event(struct ust_app *app, | |
1308 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1309 | { | |
1310 | int ret; | |
1311 | ||
840cb59c | 1312 | health_code_update(); |
86acf0da | 1313 | |
852d0037 | 1314 | ret = ustctl_enable(app->sock, ua_event->obj); |
edb67388 | 1315 | if (ret < 0) { |
ffe60014 DG |
1316 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1317 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1318 | "and session handle %d with ret %d", | |
1319 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1320 | } else { | |
3757b385 DG |
1321 | /* |
1322 | * This is normal behavior, an application can die during the | |
1323 | * creation process. Don't report an error so the execution can | |
1324 | * continue normally. | |
1325 | */ | |
1326 | ret = 0; | |
ffe60014 DG |
1327 | DBG3("UST app enable event failed. Application is dead."); |
1328 | } | |
edb67388 DG |
1329 | goto error; |
1330 | } | |
1331 | ||
1332 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1333 | ua_event->attr.name, app->pid); |
edb67388 DG |
1334 | |
1335 | error: | |
840cb59c | 1336 | health_code_update(); |
edb67388 DG |
1337 | return ret; |
1338 | } | |
1339 | ||
099e26bd | 1340 | /* |
7972aab2 | 1341 | * Send channel and stream buffer to application. |
4f3ab6ee | 1342 | * |
ffe60014 | 1343 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1344 | */ |
7972aab2 DG |
1345 | static int send_channel_pid_to_ust(struct ust_app *app, |
1346 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1347 | { |
1348 | int ret; | |
ffe60014 | 1349 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1350 | |
1351 | assert(app); | |
ffe60014 | 1352 | assert(ua_sess); |
4f3ab6ee | 1353 | assert(ua_chan); |
4f3ab6ee | 1354 | |
840cb59c | 1355 | health_code_update(); |
4f3ab6ee | 1356 | |
7972aab2 DG |
1357 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1358 | app->sock); | |
86acf0da | 1359 | |
ffe60014 DG |
1360 | /* Send channel to the application. */ |
1361 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
5b4a0ec0 | 1362 | if (ret < 0) { |
b551a063 DG |
1363 | goto error; |
1364 | } | |
1365 | ||
d88aee68 DG |
1366 | health_code_update(); |
1367 | ||
ffe60014 DG |
1368 | /* Send all streams to application. */ |
1369 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1370 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
1371 | if (ret < 0) { | |
1372 | goto error; | |
1373 | } | |
1374 | /* We don't need the stream anymore once sent to the tracer. */ | |
1375 | cds_list_del(&stream->list); | |
1376 | delete_ust_app_stream(-1, stream); | |
1377 | } | |
ffe60014 DG |
1378 | /* Flag the channel that it is sent to the application. */ |
1379 | ua_chan->is_sent = 1; | |
ffe60014 | 1380 | |
b551a063 | 1381 | error: |
840cb59c | 1382 | health_code_update(); |
b551a063 DG |
1383 | return ret; |
1384 | } | |
1385 | ||
91d76f53 | 1386 | /* |
5b4a0ec0 | 1387 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1388 | * |
1389 | * Should be called with session mutex held. | |
91d76f53 | 1390 | */ |
edb67388 DG |
1391 | static |
1392 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1393 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1394 | { |
5b4a0ec0 | 1395 | int ret = 0; |
284d8f55 | 1396 | |
840cb59c | 1397 | health_code_update(); |
86acf0da | 1398 | |
5b4a0ec0 | 1399 | /* Create UST event on tracer */ |
852d0037 | 1400 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 DG |
1401 | &ua_event->obj); |
1402 | if (ret < 0) { | |
ffe60014 DG |
1403 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1404 | ERR("Error ustctl create event %s for app pid: %d with ret %d", | |
1405 | ua_event->attr.name, app->pid, ret); | |
1406 | } else { | |
3757b385 DG |
1407 | /* |
1408 | * This is normal behavior, an application can die during the | |
1409 | * creation process. Don't report an error so the execution can | |
1410 | * continue normally. | |
1411 | */ | |
1412 | ret = 0; | |
ffe60014 DG |
1413 | DBG3("UST app create event failed. Application is dead."); |
1414 | } | |
5b4a0ec0 | 1415 | goto error; |
91d76f53 | 1416 | } |
f6a9efaa | 1417 | |
5b4a0ec0 | 1418 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1419 | |
5b4a0ec0 | 1420 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1421 | ua_event->attr.name, app->pid); |
f6a9efaa | 1422 | |
840cb59c | 1423 | health_code_update(); |
86acf0da | 1424 | |
025faf73 DG |
1425 | /* Set filter if one is present. */ |
1426 | if (ua_event->filter) { | |
1427 | ret = set_ust_event_filter(ua_event, app); | |
1428 | if (ret < 0) { | |
1429 | goto error; | |
1430 | } | |
1431 | } | |
1432 | ||
7cc9a73c JI |
1433 | /* Set exclusions for the event */ |
1434 | if (ua_event->exclusion) { | |
1435 | ret = set_ust_event_exclusion(ua_event, app); | |
1436 | if (ret < 0) { | |
1437 | goto error; | |
1438 | } | |
1439 | } | |
1440 | ||
8535a6d9 | 1441 | /* If event not enabled, disable it on the tracer */ |
fc34caaa | 1442 | if (ua_event->enabled == 0) { |
8535a6d9 DG |
1443 | ret = disable_ust_event(app, ua_sess, ua_event); |
1444 | if (ret < 0) { | |
fc34caaa DG |
1445 | /* |
1446 | * If we hit an EPERM, something is wrong with our disable call. If | |
1447 | * we get an EEXIST, there is a problem on the tracer side since we | |
1448 | * just created it. | |
1449 | */ | |
1450 | switch (ret) { | |
49c336c1 | 1451 | case -LTTNG_UST_ERR_PERM: |
fc34caaa DG |
1452 | /* Code flow problem */ |
1453 | assert(0); | |
49c336c1 | 1454 | case -LTTNG_UST_ERR_EXIST: |
fc34caaa DG |
1455 | /* It's OK for our use case. */ |
1456 | ret = 0; | |
1457 | break; | |
1458 | default: | |
1459 | break; | |
1460 | } | |
8535a6d9 DG |
1461 | goto error; |
1462 | } | |
1463 | } | |
1464 | ||
5b4a0ec0 | 1465 | error: |
840cb59c | 1466 | health_code_update(); |
5b4a0ec0 | 1467 | return ret; |
91d76f53 | 1468 | } |
48842b30 | 1469 | |
5b4a0ec0 DG |
1470 | /* |
1471 | * Copy data between an UST app event and a LTT event. | |
1472 | */ | |
421cb601 | 1473 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1474 | struct ltt_ust_event *uevent) |
1475 | { | |
b4ffad32 JI |
1476 | size_t exclusion_alloc_size; |
1477 | ||
48842b30 DG |
1478 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); |
1479 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1480 | ||
fc34caaa DG |
1481 | ua_event->enabled = uevent->enabled; |
1482 | ||
5b4a0ec0 DG |
1483 | /* Copy event attributes */ |
1484 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1485 | ||
53a80697 MD |
1486 | /* Copy filter bytecode */ |
1487 | if (uevent->filter) { | |
025faf73 DG |
1488 | ua_event->filter = alloc_copy_ust_app_filter(uevent->filter); |
1489 | /* Filter might be NULL here in case of ENONEM. */ | |
53a80697 | 1490 | } |
b4ffad32 JI |
1491 | |
1492 | /* Copy exclusion data */ | |
1493 | if (uevent->exclusion) { | |
1494 | exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) + | |
1495 | LTTNG_UST_SYM_NAME_LEN * uevent->exclusion->count; | |
1496 | ua_event->exclusion = zmalloc(exclusion_alloc_size); | |
5f8df26c JI |
1497 | if (ua_event->exclusion == NULL) { |
1498 | PERROR("malloc"); | |
1499 | } else { | |
1500 | memcpy(ua_event->exclusion, uevent->exclusion, | |
1501 | exclusion_alloc_size); | |
b4ffad32 JI |
1502 | } |
1503 | } | |
48842b30 DG |
1504 | } |
1505 | ||
5b4a0ec0 DG |
1506 | /* |
1507 | * Copy data between an UST app channel and a LTT channel. | |
1508 | */ | |
421cb601 | 1509 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1510 | struct ltt_ust_channel *uchan) |
1511 | { | |
bec39940 | 1512 | struct lttng_ht_iter iter; |
48842b30 | 1513 | struct ltt_ust_event *uevent; |
55cc08a6 | 1514 | struct ltt_ust_context *uctx; |
48842b30 | 1515 | struct ust_app_event *ua_event; |
55cc08a6 | 1516 | struct ust_app_ctx *ua_ctx; |
48842b30 | 1517 | |
fc34caaa | 1518 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1519 | |
1520 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1521 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 1522 | |
1624d5b7 JD |
1523 | ua_chan->tracefile_size = uchan->tracefile_size; |
1524 | ua_chan->tracefile_count = uchan->tracefile_count; | |
1525 | ||
ffe60014 DG |
1526 | /* Copy event attributes since the layout is different. */ |
1527 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1528 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1529 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1530 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1531 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
1532 | ua_chan->attr.output = uchan->attr.output; | |
1533 | /* | |
1534 | * Note that the attribute channel type is not set since the channel on the | |
1535 | * tracing registry side does not have this information. | |
1536 | */ | |
48842b30 | 1537 | |
fc34caaa | 1538 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1539 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1540 | |
31746f93 | 1541 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { |
55cc08a6 DG |
1542 | ua_ctx = alloc_ust_app_ctx(&uctx->ctx); |
1543 | if (ua_ctx == NULL) { | |
1544 | continue; | |
1545 | } | |
bec39940 DG |
1546 | lttng_ht_node_init_ulong(&ua_ctx->node, |
1547 | (unsigned long) ua_ctx->ctx.ctx); | |
1548 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
31746f93 | 1549 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
55cc08a6 | 1550 | } |
48842b30 | 1551 | |
421cb601 | 1552 | /* Copy all events from ltt ust channel to ust app channel */ |
bec39940 | 1553 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
18eace3b | 1554 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 1555 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 1556 | if (ua_event == NULL) { |
421cb601 | 1557 | DBG2("UST event %s not found on shadow copy channel", |
48842b30 | 1558 | uevent->attr.name); |
284d8f55 | 1559 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
48842b30 | 1560 | if (ua_event == NULL) { |
5b4a0ec0 | 1561 | continue; |
48842b30 | 1562 | } |
421cb601 | 1563 | shadow_copy_event(ua_event, uevent); |
d0b96690 | 1564 | add_unique_ust_app_event(ua_chan, ua_event); |
48842b30 | 1565 | } |
48842b30 DG |
1566 | } |
1567 | ||
fc34caaa | 1568 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1569 | } |
1570 | ||
5b4a0ec0 DG |
1571 | /* |
1572 | * Copy data between a UST app session and a regular LTT session. | |
1573 | */ | |
421cb601 | 1574 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1575 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1576 | { |
bec39940 DG |
1577 | struct lttng_ht_node_str *ua_chan_node; |
1578 | struct lttng_ht_iter iter; | |
48842b30 DG |
1579 | struct ltt_ust_channel *uchan; |
1580 | struct ust_app_channel *ua_chan; | |
477d7741 MD |
1581 | time_t rawtime; |
1582 | struct tm *timeinfo; | |
1583 | char datetime[16]; | |
1584 | int ret; | |
1585 | ||
1586 | /* Get date and time for unique app path */ | |
1587 | time(&rawtime); | |
1588 | timeinfo = localtime(&rawtime); | |
1589 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1590 | |
421cb601 | 1591 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1592 | |
7972aab2 DG |
1593 | ua_sess->tracing_id = usess->id; |
1594 | ua_sess->id = get_next_session_id(); | |
1595 | ua_sess->uid = app->uid; | |
1596 | ua_sess->gid = app->gid; | |
1597 | ua_sess->euid = usess->uid; | |
1598 | ua_sess->egid = usess->gid; | |
1599 | ua_sess->buffer_type = usess->buffer_type; | |
1600 | ua_sess->bits_per_long = app->bits_per_long; | |
1601 | /* There is only one consumer object per session possible. */ | |
1602 | ua_sess->consumer = usess->consumer; | |
2bba9e53 | 1603 | ua_sess->output_traces = usess->output_traces; |
ecc48a90 | 1604 | ua_sess->live_timer_interval = usess->live_timer_interval; |
7972aab2 DG |
1605 | |
1606 | switch (ua_sess->buffer_type) { | |
1607 | case LTTNG_BUFFER_PER_PID: | |
1608 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 1609 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
1610 | datetime); |
1611 | break; | |
1612 | case LTTNG_BUFFER_PER_UID: | |
1613 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1614 | DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long); | |
1615 | break; | |
1616 | default: | |
1617 | assert(0); | |
1618 | goto error; | |
1619 | } | |
477d7741 MD |
1620 | if (ret < 0) { |
1621 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1622 | assert(0); |
7972aab2 | 1623 | goto error; |
477d7741 MD |
1624 | } |
1625 | ||
48842b30 | 1626 | /* Iterate over all channels in global domain. */ |
bec39940 DG |
1627 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, |
1628 | uchan, node.node) { | |
1629 | struct lttng_ht_iter uiter; | |
ba767faf | 1630 | |
bec39940 DG |
1631 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
1632 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
5b4a0ec0 | 1633 | if (ua_chan_node != NULL) { |
fc34caaa | 1634 | /* Session exist. Contiuing. */ |
5b4a0ec0 DG |
1635 | continue; |
1636 | } | |
421cb601 | 1637 | |
5b4a0ec0 DG |
1638 | DBG2("Channel %s not found on shadow session copy, creating it", |
1639 | uchan->name); | |
d0b96690 | 1640 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
5b4a0ec0 | 1641 | if (ua_chan == NULL) { |
fc34caaa | 1642 | /* malloc failed FIXME: Might want to do handle ENOMEM .. */ |
5b4a0ec0 | 1643 | continue; |
48842b30 | 1644 | } |
5b4a0ec0 | 1645 | shadow_copy_channel(ua_chan, uchan); |
ffe60014 DG |
1646 | /* |
1647 | * The concept of metadata channel does not exist on the tracing | |
1648 | * registry side of the session daemon so this can only be a per CPU | |
1649 | * channel and not metadata. | |
1650 | */ | |
1651 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
1652 | ||
bec39940 | 1653 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); |
48842b30 | 1654 | } |
7972aab2 DG |
1655 | |
1656 | error: | |
1657 | return; | |
48842b30 DG |
1658 | } |
1659 | ||
78f0bacd DG |
1660 | /* |
1661 | * Lookup sesison wrapper. | |
1662 | */ | |
84cd17c6 MD |
1663 | static |
1664 | void __lookup_session_by_app(struct ltt_ust_session *usess, | |
bec39940 | 1665 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1666 | { |
1667 | /* Get right UST app session from app */ | |
d9bf3ca4 | 1668 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
1669 | } |
1670 | ||
421cb601 DG |
1671 | /* |
1672 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1673 | * id. |
421cb601 | 1674 | */ |
48842b30 DG |
1675 | static struct ust_app_session *lookup_session_by_app( |
1676 | struct ltt_ust_session *usess, struct ust_app *app) | |
1677 | { | |
bec39940 | 1678 | struct lttng_ht_iter iter; |
d9bf3ca4 | 1679 | struct lttng_ht_node_u64 *node; |
48842b30 | 1680 | |
84cd17c6 | 1681 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 1682 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
1683 | if (node == NULL) { |
1684 | goto error; | |
1685 | } | |
1686 | ||
1687 | return caa_container_of(node, struct ust_app_session, node); | |
1688 | ||
1689 | error: | |
1690 | return NULL; | |
1691 | } | |
1692 | ||
7972aab2 DG |
1693 | /* |
1694 | * Setup buffer registry per PID for the given session and application. If none | |
1695 | * is found, a new one is created, added to the global registry and | |
1696 | * initialized. If regp is valid, it's set with the newly created object. | |
1697 | * | |
1698 | * Return 0 on success or else a negative value. | |
1699 | */ | |
1700 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
1701 | struct ust_app *app, struct buffer_reg_pid **regp) | |
1702 | { | |
1703 | int ret = 0; | |
1704 | struct buffer_reg_pid *reg_pid; | |
1705 | ||
1706 | assert(ua_sess); | |
1707 | assert(app); | |
1708 | ||
1709 | rcu_read_lock(); | |
1710 | ||
1711 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
1712 | if (!reg_pid) { | |
1713 | /* | |
1714 | * This is the create channel path meaning that if there is NO | |
1715 | * registry available, we have to create one for this session. | |
1716 | */ | |
1717 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid); | |
1718 | if (ret < 0) { | |
1719 | goto error; | |
1720 | } | |
1721 | buffer_reg_pid_add(reg_pid); | |
1722 | } else { | |
1723 | goto end; | |
1724 | } | |
1725 | ||
1726 | /* Initialize registry. */ | |
1727 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
1728 | app->bits_per_long, app->uint8_t_alignment, | |
1729 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1730 | app->uint64_t_alignment, app->long_alignment, |
1731 | app->byte_order, app->version.major, | |
1732 | app->version.minor); | |
7972aab2 DG |
1733 | if (ret < 0) { |
1734 | goto error; | |
1735 | } | |
1736 | ||
1737 | DBG3("UST app buffer registry per PID created successfully"); | |
1738 | ||
1739 | end: | |
1740 | if (regp) { | |
1741 | *regp = reg_pid; | |
1742 | } | |
1743 | error: | |
1744 | rcu_read_unlock(); | |
1745 | return ret; | |
1746 | } | |
1747 | ||
1748 | /* | |
1749 | * Setup buffer registry per UID for the given session and application. If none | |
1750 | * is found, a new one is created, added to the global registry and | |
1751 | * initialized. If regp is valid, it's set with the newly created object. | |
1752 | * | |
1753 | * Return 0 on success or else a negative value. | |
1754 | */ | |
1755 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
1756 | struct ust_app *app, struct buffer_reg_uid **regp) | |
1757 | { | |
1758 | int ret = 0; | |
1759 | struct buffer_reg_uid *reg_uid; | |
1760 | ||
1761 | assert(usess); | |
1762 | assert(app); | |
1763 | ||
1764 | rcu_read_lock(); | |
1765 | ||
1766 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
1767 | if (!reg_uid) { | |
1768 | /* | |
1769 | * This is the create channel path meaning that if there is NO | |
1770 | * registry available, we have to create one for this session. | |
1771 | */ | |
1772 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
1773 | LTTNG_DOMAIN_UST, ®_uid); | |
1774 | if (ret < 0) { | |
1775 | goto error; | |
1776 | } | |
1777 | buffer_reg_uid_add(reg_uid); | |
1778 | } else { | |
1779 | goto end; | |
1780 | } | |
1781 | ||
1782 | /* Initialize registry. */ | |
af6142cf | 1783 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
1784 | app->bits_per_long, app->uint8_t_alignment, |
1785 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1786 | app->uint64_t_alignment, app->long_alignment, |
1787 | app->byte_order, app->version.major, | |
1788 | app->version.minor); | |
7972aab2 DG |
1789 | if (ret < 0) { |
1790 | goto error; | |
1791 | } | |
1792 | /* Add node to teardown list of the session. */ | |
1793 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
1794 | ||
1795 | DBG3("UST app buffer registry per UID created successfully"); | |
1796 | ||
1797 | end: | |
1798 | if (regp) { | |
1799 | *regp = reg_uid; | |
1800 | } | |
1801 | error: | |
1802 | rcu_read_unlock(); | |
1803 | return ret; | |
1804 | } | |
1805 | ||
421cb601 | 1806 | /* |
3d8ca23b | 1807 | * Create a session on the tracer side for the given app. |
421cb601 | 1808 | * |
3d8ca23b DG |
1809 | * On success, ua_sess_ptr is populated with the session pointer or else left |
1810 | * untouched. If the session was created, is_created is set to 1. On error, | |
1811 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
1812 | * be NULL. | |
1813 | * | |
1814 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
1815 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 1816 | */ |
3d8ca23b DG |
1817 | static int create_ust_app_session(struct ltt_ust_session *usess, |
1818 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, | |
1819 | int *is_created) | |
421cb601 | 1820 | { |
3d8ca23b | 1821 | int ret, created = 0; |
421cb601 DG |
1822 | struct ust_app_session *ua_sess; |
1823 | ||
3d8ca23b DG |
1824 | assert(usess); |
1825 | assert(app); | |
1826 | assert(ua_sess_ptr); | |
1827 | ||
840cb59c | 1828 | health_code_update(); |
86acf0da | 1829 | |
421cb601 DG |
1830 | ua_sess = lookup_session_by_app(usess, app); |
1831 | if (ua_sess == NULL) { | |
d9bf3ca4 | 1832 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 1833 | app->pid, usess->id); |
d0b96690 | 1834 | ua_sess = alloc_ust_app_session(app); |
421cb601 DG |
1835 | if (ua_sess == NULL) { |
1836 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
1837 | ret = -ENOMEM; |
1838 | goto error; | |
421cb601 | 1839 | } |
477d7741 | 1840 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 1841 | created = 1; |
421cb601 DG |
1842 | } |
1843 | ||
7972aab2 DG |
1844 | switch (usess->buffer_type) { |
1845 | case LTTNG_BUFFER_PER_PID: | |
1846 | /* Init local registry. */ | |
1847 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 1848 | if (ret < 0) { |
7972aab2 DG |
1849 | goto error; |
1850 | } | |
1851 | break; | |
1852 | case LTTNG_BUFFER_PER_UID: | |
1853 | /* Look for a global registry. If none exists, create one. */ | |
1854 | ret = setup_buffer_reg_uid(usess, app, NULL); | |
1855 | if (ret < 0) { | |
1856 | goto error; | |
1857 | } | |
1858 | break; | |
1859 | default: | |
1860 | assert(0); | |
1861 | ret = -EINVAL; | |
1862 | goto error; | |
1863 | } | |
1864 | ||
1865 | health_code_update(); | |
1866 | ||
1867 | if (ua_sess->handle == -1) { | |
1868 | ret = ustctl_create_session(app->sock); | |
1869 | if (ret < 0) { | |
1870 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1871 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
1872 | app->pid, ret); |
1873 | } else { | |
1874 | DBG("UST app creating session failed. Application is dead"); | |
3757b385 DG |
1875 | /* |
1876 | * This is normal behavior, an application can die during the | |
1877 | * creation process. Don't report an error so the execution can | |
1878 | * continue normally. This will get flagged ENOTCONN and the | |
1879 | * caller will handle it. | |
1880 | */ | |
1881 | ret = 0; | |
ffe60014 | 1882 | } |
d0b96690 | 1883 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
1884 | if (ret != -ENOMEM) { |
1885 | /* | |
1886 | * Tracer is probably gone or got an internal error so let's | |
1887 | * behave like it will soon unregister or not usable. | |
1888 | */ | |
1889 | ret = -ENOTCONN; | |
1890 | } | |
1891 | goto error; | |
421cb601 DG |
1892 | } |
1893 | ||
7972aab2 DG |
1894 | ua_sess->handle = ret; |
1895 | ||
1896 | /* Add ust app session to app's HT */ | |
d9bf3ca4 MD |
1897 | lttng_ht_node_init_u64(&ua_sess->node, |
1898 | ua_sess->tracing_id); | |
1899 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
7972aab2 DG |
1900 | |
1901 | DBG2("UST app session created successfully with handle %d", ret); | |
1902 | } | |
1903 | ||
1904 | *ua_sess_ptr = ua_sess; | |
1905 | if (is_created) { | |
1906 | *is_created = created; | |
1907 | } | |
1908 | ||
1909 | /* Everything went well. */ | |
1910 | ret = 0; | |
1911 | ||
1912 | error: | |
1913 | health_code_update(); | |
1914 | return ret; | |
1915 | } | |
1916 | ||
1917 | /* | |
1918 | * Create a context for the channel on the tracer. | |
1919 | * | |
1920 | * Called with UST app session lock held and a RCU read side lock. | |
1921 | */ | |
1922 | static | |
1923 | int create_ust_app_channel_context(struct ust_app_session *ua_sess, | |
1924 | struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx, | |
1925 | struct ust_app *app) | |
1926 | { | |
1927 | int ret = 0; | |
1928 | struct lttng_ht_iter iter; | |
1929 | struct lttng_ht_node_ulong *node; | |
1930 | struct ust_app_ctx *ua_ctx; | |
1931 | ||
1932 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
1933 | ||
1934 | lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter); | |
1935 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1936 | if (node != NULL) { | |
1937 | ret = -EEXIST; | |
1938 | goto error; | |
1939 | } | |
1940 | ||
1941 | ua_ctx = alloc_ust_app_ctx(uctx); | |
1942 | if (ua_ctx == NULL) { | |
1943 | /* malloc failed */ | |
1944 | ret = -1; | |
1945 | goto error; | |
1946 | } | |
1947 | ||
1948 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
1949 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
31746f93 | 1950 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
1951 | |
1952 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
1953 | if (ret < 0) { | |
1954 | goto error; | |
1955 | } | |
1956 | ||
1957 | error: | |
1958 | return ret; | |
1959 | } | |
1960 | ||
1961 | /* | |
1962 | * Enable on the tracer side a ust app event for the session and channel. | |
1963 | * | |
1964 | * Called with UST app session lock held. | |
1965 | */ | |
1966 | static | |
1967 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
1968 | struct ust_app_event *ua_event, struct ust_app *app) | |
1969 | { | |
1970 | int ret; | |
1971 | ||
1972 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1973 | if (ret < 0) { | |
1974 | goto error; | |
1975 | } | |
1976 | ||
1977 | ua_event->enabled = 1; | |
1978 | ||
1979 | error: | |
1980 | return ret; | |
1981 | } | |
1982 | ||
1983 | /* | |
1984 | * Disable on the tracer side a ust app event for the session and channel. | |
1985 | */ | |
1986 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
1987 | struct ust_app_event *ua_event, struct ust_app *app) | |
1988 | { | |
1989 | int ret; | |
1990 | ||
1991 | ret = disable_ust_event(app, ua_sess, ua_event); | |
1992 | if (ret < 0) { | |
1993 | goto error; | |
1994 | } | |
1995 | ||
1996 | ua_event->enabled = 0; | |
1997 | ||
1998 | error: | |
1999 | return ret; | |
2000 | } | |
2001 | ||
2002 | /* | |
2003 | * Lookup ust app channel for session and disable it on the tracer side. | |
2004 | */ | |
2005 | static | |
2006 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
2007 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
2008 | { | |
2009 | int ret; | |
2010 | ||
2011 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2012 | if (ret < 0) { | |
2013 | goto error; | |
2014 | } | |
2015 | ||
2016 | ua_chan->enabled = 0; | |
2017 | ||
2018 | error: | |
2019 | return ret; | |
2020 | } | |
2021 | ||
2022 | /* | |
2023 | * Lookup ust app channel for session and enable it on the tracer side. This | |
2024 | * MUST be called with a RCU read side lock acquired. | |
2025 | */ | |
2026 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
2027 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
2028 | { | |
2029 | int ret = 0; | |
2030 | struct lttng_ht_iter iter; | |
2031 | struct lttng_ht_node_str *ua_chan_node; | |
2032 | struct ust_app_channel *ua_chan; | |
2033 | ||
2034 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
2035 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
2036 | if (ua_chan_node == NULL) { | |
d9bf3ca4 | 2037 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
2038 | uchan->name, ua_sess->tracing_id); |
2039 | goto error; | |
2040 | } | |
2041 | ||
2042 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2043 | ||
2044 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
2045 | if (ret < 0) { | |
2046 | goto error; | |
2047 | } | |
2048 | ||
2049 | error: | |
2050 | return ret; | |
2051 | } | |
2052 | ||
2053 | /* | |
2054 | * Ask the consumer to create a channel and get it if successful. | |
2055 | * | |
2056 | * Return 0 on success or else a negative value. | |
2057 | */ | |
2058 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
2059 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
2060 | int bitness, struct ust_registry_session *registry) | |
2061 | { | |
2062 | int ret; | |
2063 | unsigned int nb_fd = 0; | |
2064 | struct consumer_socket *socket; | |
2065 | ||
2066 | assert(usess); | |
2067 | assert(ua_sess); | |
2068 | assert(ua_chan); | |
2069 | assert(registry); | |
2070 | ||
2071 | rcu_read_lock(); | |
2072 | health_code_update(); | |
2073 | ||
2074 | /* Get the right consumer socket for the application. */ | |
2075 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
2076 | if (!socket) { | |
2077 | ret = -EINVAL; | |
2078 | goto error; | |
2079 | } | |
2080 | ||
2081 | health_code_update(); | |
2082 | ||
2083 | /* Need one fd for the channel. */ | |
2084 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2085 | if (ret < 0) { | |
2086 | ERR("Exhausted number of available FD upon create channel"); | |
2087 | goto error; | |
2088 | } | |
2089 | ||
2090 | /* | |
2091 | * Ask consumer to create channel. The consumer will return the number of | |
2092 | * stream we have to expect. | |
2093 | */ | |
2094 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
2095 | registry); | |
2096 | if (ret < 0) { | |
2097 | goto error_ask; | |
2098 | } | |
2099 | ||
2100 | /* | |
2101 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2102 | * stream (2 being the default value here). | |
2103 | */ | |
2104 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2105 | ||
2106 | /* Reserve the amount of file descriptor we need. */ | |
2107 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2108 | if (ret < 0) { | |
2109 | ERR("Exhausted number of available FD upon create channel"); | |
2110 | goto error_fd_get_stream; | |
2111 | } | |
2112 | ||
2113 | health_code_update(); | |
2114 | ||
2115 | /* | |
2116 | * Now get the channel from the consumer. This call wil populate the stream | |
2117 | * list of that channel and set the ust objects. | |
2118 | */ | |
d9078d0c DG |
2119 | if (usess->consumer->enabled) { |
2120 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2121 | if (ret < 0) { | |
2122 | goto error_destroy; | |
2123 | } | |
7972aab2 DG |
2124 | } |
2125 | ||
2126 | rcu_read_unlock(); | |
2127 | return 0; | |
2128 | ||
2129 | error_destroy: | |
2130 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2131 | error_fd_get_stream: | |
2132 | /* | |
2133 | * Initiate a destroy channel on the consumer since we had an error | |
2134 | * handling it on our side. The return value is of no importance since we | |
2135 | * already have a ret value set by the previous error that we need to | |
2136 | * return. | |
2137 | */ | |
2138 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2139 | error_ask: | |
2140 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2141 | error: | |
2142 | health_code_update(); | |
2143 | rcu_read_unlock(); | |
2144 | return ret; | |
2145 | } | |
2146 | ||
2147 | /* | |
2148 | * Duplicate the ust data object of the ust app stream and save it in the | |
2149 | * buffer registry stream. | |
2150 | * | |
2151 | * Return 0 on success or else a negative value. | |
2152 | */ | |
2153 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2154 | struct ust_app_stream *stream) | |
2155 | { | |
2156 | int ret; | |
2157 | ||
2158 | assert(reg_stream); | |
2159 | assert(stream); | |
2160 | ||
2161 | /* Reserve the amount of file descriptor we need. */ | |
2162 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2163 | if (ret < 0) { | |
2164 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2165 | goto error; | |
2166 | } | |
2167 | ||
2168 | /* Duplicate object for stream once the original is in the registry. */ | |
2169 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2170 | reg_stream->obj.ust); | |
2171 | if (ret < 0) { | |
2172 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2173 | reg_stream->obj.ust, stream->obj, ret); | |
2174 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2175 | goto error; | |
2176 | } | |
2177 | stream->handle = stream->obj->handle; | |
2178 | ||
2179 | error: | |
2180 | return ret; | |
2181 | } | |
2182 | ||
2183 | /* | |
2184 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2185 | * buffer registry channel. | |
2186 | * | |
2187 | * Return 0 on success or else a negative value. | |
2188 | */ | |
2189 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2190 | struct ust_app_channel *ua_chan) | |
2191 | { | |
2192 | int ret; | |
2193 | ||
2194 | assert(reg_chan); | |
2195 | assert(ua_chan); | |
2196 | ||
2197 | /* Need two fds for the channel. */ | |
2198 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2199 | if (ret < 0) { | |
2200 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2201 | goto error_fd_get; | |
2202 | } | |
2203 | ||
2204 | /* Duplicate object for stream once the original is in the registry. */ | |
2205 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2206 | if (ret < 0) { | |
2207 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2208 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2209 | goto error; | |
2210 | } | |
2211 | ua_chan->handle = ua_chan->obj->handle; | |
2212 | ||
2213 | return 0; | |
2214 | ||
2215 | error: | |
2216 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2217 | error_fd_get: | |
2218 | return ret; | |
2219 | } | |
2220 | ||
2221 | /* | |
2222 | * For a given channel buffer registry, setup all streams of the given ust | |
2223 | * application channel. | |
2224 | * | |
2225 | * Return 0 on success or else a negative value. | |
2226 | */ | |
2227 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
2228 | struct ust_app_channel *ua_chan) | |
2229 | { | |
2230 | int ret = 0; | |
2231 | struct ust_app_stream *stream, *stmp; | |
2232 | ||
2233 | assert(reg_chan); | |
2234 | assert(ua_chan); | |
2235 | ||
2236 | DBG2("UST app setup buffer registry stream"); | |
2237 | ||
2238 | /* Send all streams to application. */ | |
2239 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2240 | struct buffer_reg_stream *reg_stream; | |
2241 | ||
2242 | ret = buffer_reg_stream_create(®_stream); | |
2243 | if (ret < 0) { | |
2244 | goto error; | |
2245 | } | |
2246 | ||
2247 | /* | |
2248 | * Keep original pointer and nullify it in the stream so the delete | |
2249 | * stream call does not release the object. | |
2250 | */ | |
2251 | reg_stream->obj.ust = stream->obj; | |
2252 | stream->obj = NULL; | |
2253 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2254 | |
7972aab2 DG |
2255 | /* We don't need the streams anymore. */ |
2256 | cds_list_del(&stream->list); | |
2257 | delete_ust_app_stream(-1, stream); | |
2258 | } | |
421cb601 | 2259 | |
7972aab2 DG |
2260 | error: |
2261 | return ret; | |
2262 | } | |
2263 | ||
2264 | /* | |
2265 | * Create a buffer registry channel for the given session registry and | |
2266 | * application channel object. If regp pointer is valid, it's set with the | |
2267 | * created object. Important, the created object is NOT added to the session | |
2268 | * registry hash table. | |
2269 | * | |
2270 | * Return 0 on success else a negative value. | |
2271 | */ | |
2272 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2273 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2274 | { | |
2275 | int ret; | |
2276 | struct buffer_reg_channel *reg_chan = NULL; | |
2277 | ||
2278 | assert(reg_sess); | |
2279 | assert(ua_chan); | |
2280 | ||
2281 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2282 | ||
2283 | /* Create buffer registry channel. */ | |
2284 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2285 | if (ret < 0) { | |
2286 | goto error_create; | |
421cb601 | 2287 | } |
7972aab2 DG |
2288 | assert(reg_chan); |
2289 | reg_chan->consumer_key = ua_chan->key; | |
8c924c7b | 2290 | reg_chan->subbuf_size = ua_chan->attr.subbuf_size; |
421cb601 | 2291 | |
7972aab2 DG |
2292 | /* Create and add a channel registry to session. */ |
2293 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2294 | ua_chan->tracing_channel_id); | |
2295 | if (ret < 0) { | |
2296 | goto error; | |
d88aee68 | 2297 | } |
7972aab2 | 2298 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2299 | |
7972aab2 DG |
2300 | if (regp) { |
2301 | *regp = reg_chan; | |
3d8ca23b | 2302 | } |
d88aee68 | 2303 | |
7972aab2 | 2304 | return 0; |
3d8ca23b DG |
2305 | |
2306 | error: | |
7972aab2 DG |
2307 | /* Safe because the registry channel object was not added to any HT. */ |
2308 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2309 | error_create: | |
3d8ca23b | 2310 | return ret; |
421cb601 DG |
2311 | } |
2312 | ||
55cc08a6 | 2313 | /* |
7972aab2 DG |
2314 | * Setup buffer registry channel for the given session registry and application |
2315 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2316 | * |
7972aab2 | 2317 | * Return 0 on success else a negative value. |
55cc08a6 | 2318 | */ |
7972aab2 DG |
2319 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
2320 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan) | |
55cc08a6 | 2321 | { |
7972aab2 | 2322 | int ret; |
55cc08a6 | 2323 | |
7972aab2 DG |
2324 | assert(reg_sess); |
2325 | assert(reg_chan); | |
2326 | assert(ua_chan); | |
2327 | assert(ua_chan->obj); | |
55cc08a6 | 2328 | |
7972aab2 | 2329 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2330 | |
7972aab2 DG |
2331 | /* Setup all streams for the registry. */ |
2332 | ret = setup_buffer_reg_streams(reg_chan, ua_chan); | |
2333 | if (ret < 0) { | |
55cc08a6 DG |
2334 | goto error; |
2335 | } | |
2336 | ||
7972aab2 DG |
2337 | reg_chan->obj.ust = ua_chan->obj; |
2338 | ua_chan->obj = NULL; | |
55cc08a6 | 2339 | |
7972aab2 | 2340 | return 0; |
55cc08a6 DG |
2341 | |
2342 | error: | |
7972aab2 DG |
2343 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2344 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2345 | return ret; |
2346 | } | |
2347 | ||
edb67388 | 2348 | /* |
7972aab2 | 2349 | * Send buffer registry channel to the application. |
d0b96690 | 2350 | * |
7972aab2 | 2351 | * Return 0 on success else a negative value. |
edb67388 | 2352 | */ |
7972aab2 DG |
2353 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2354 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2355 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2356 | { |
2357 | int ret; | |
7972aab2 | 2358 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2359 | |
7972aab2 DG |
2360 | assert(reg_chan); |
2361 | assert(app); | |
2362 | assert(ua_sess); | |
2363 | assert(ua_chan); | |
2364 | ||
2365 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2366 | ||
2367 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2368 | if (ret < 0) { |
2369 | goto error; | |
2370 | } | |
2371 | ||
7972aab2 DG |
2372 | /* Send channel to the application. */ |
2373 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
2374 | if (ret < 0) { | |
2375 | goto error; | |
2376 | } | |
2377 | ||
2378 | health_code_update(); | |
2379 | ||
2380 | /* Send all streams to application. */ | |
2381 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2382 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2383 | struct ust_app_stream stream; | |
2384 | ||
2385 | ret = duplicate_stream_object(reg_stream, &stream); | |
2386 | if (ret < 0) { | |
2387 | goto error_stream_unlock; | |
2388 | } | |
2389 | ||
2390 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2391 | if (ret < 0) { | |
8c067051 | 2392 | (void) release_ust_app_stream(-1, &stream); |
7972aab2 DG |
2393 | goto error_stream_unlock; |
2394 | } | |
edb67388 | 2395 | |
7972aab2 DG |
2396 | /* |
2397 | * The return value is not important here. This function will output an | |
2398 | * error if needed. | |
2399 | */ | |
2400 | (void) release_ust_app_stream(-1, &stream); | |
2401 | } | |
2402 | ua_chan->is_sent = 1; | |
2403 | ||
2404 | error_stream_unlock: | |
2405 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2406 | error: |
2407 | return ret; | |
2408 | } | |
2409 | ||
9730260e | 2410 | /* |
7972aab2 DG |
2411 | * Create and send to the application the created buffers with per UID buffers. |
2412 | * | |
2413 | * Return 0 on success else a negative value. | |
9730260e | 2414 | */ |
7972aab2 DG |
2415 | static int create_channel_per_uid(struct ust_app *app, |
2416 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2417 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2418 | { |
2419 | int ret; | |
7972aab2 DG |
2420 | struct buffer_reg_uid *reg_uid; |
2421 | struct buffer_reg_channel *reg_chan; | |
9730260e | 2422 | |
7972aab2 DG |
2423 | assert(app); |
2424 | assert(usess); | |
2425 | assert(ua_sess); | |
2426 | assert(ua_chan); | |
2427 | ||
2428 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2429 | ||
2430 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2431 | /* | |
2432 | * The session creation handles the creation of this global registry | |
2433 | * object. If none can be find, there is a code flow problem or a | |
2434 | * teardown race. | |
2435 | */ | |
2436 | assert(reg_uid); | |
2437 | ||
2438 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2439 | reg_uid); | |
2440 | if (!reg_chan) { | |
2441 | /* Create the buffer registry channel object. */ | |
2442 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2443 | if (ret < 0) { | |
2444 | goto error; | |
2445 | } | |
2446 | assert(reg_chan); | |
2447 | ||
2448 | /* | |
2449 | * Create the buffers on the consumer side. This call populates the | |
2450 | * ust app channel object with all streams and data object. | |
2451 | */ | |
2452 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2453 | app->bits_per_long, reg_uid->registry->reg.ust); | |
2454 | if (ret < 0) { | |
07d2ae95 DG |
2455 | /* |
2456 | * Let's remove the previously created buffer registry channel so | |
2457 | * it's not visible anymore in the session registry. | |
2458 | */ | |
2459 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, | |
2460 | ua_chan->tracing_channel_id); | |
2461 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
2462 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
7972aab2 DG |
2463 | goto error; |
2464 | } | |
2465 | ||
2466 | /* | |
2467 | * Setup the streams and add it to the session registry. | |
2468 | */ | |
2469 | ret = setup_buffer_reg_channel(reg_uid->registry, ua_chan, reg_chan); | |
2470 | if (ret < 0) { | |
2471 | goto error; | |
2472 | } | |
2473 | ||
2474 | } | |
2475 | ||
2476 | /* Send buffers to the application. */ | |
2477 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
9730260e DG |
2478 | if (ret < 0) { |
2479 | goto error; | |
2480 | } | |
2481 | ||
9730260e DG |
2482 | error: |
2483 | return ret; | |
2484 | } | |
2485 | ||
78f0bacd | 2486 | /* |
7972aab2 DG |
2487 | * Create and send to the application the created buffers with per PID buffers. |
2488 | * | |
2489 | * Return 0 on success else a negative value. | |
78f0bacd | 2490 | */ |
7972aab2 DG |
2491 | static int create_channel_per_pid(struct ust_app *app, |
2492 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2493 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2494 | { |
8535a6d9 | 2495 | int ret; |
7972aab2 | 2496 | struct ust_registry_session *registry; |
78f0bacd | 2497 | |
7972aab2 DG |
2498 | assert(app); |
2499 | assert(usess); | |
2500 | assert(ua_sess); | |
2501 | assert(ua_chan); | |
2502 | ||
2503 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2504 | ||
2505 | rcu_read_lock(); | |
2506 | ||
2507 | registry = get_session_registry(ua_sess); | |
2508 | assert(registry); | |
2509 | ||
2510 | /* Create and add a new channel registry to session. */ | |
2511 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd DG |
2512 | if (ret < 0) { |
2513 | goto error; | |
2514 | } | |
2515 | ||
7972aab2 DG |
2516 | /* Create and get channel on the consumer side. */ |
2517 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2518 | app->bits_per_long, registry); | |
2519 | if (ret < 0) { | |
2520 | goto error; | |
2521 | } | |
2522 | ||
2523 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
2524 | if (ret < 0) { | |
2525 | goto error; | |
2526 | } | |
8535a6d9 | 2527 | |
78f0bacd | 2528 | error: |
7972aab2 | 2529 | rcu_read_unlock(); |
78f0bacd DG |
2530 | return ret; |
2531 | } | |
2532 | ||
2533 | /* | |
7972aab2 DG |
2534 | * From an already allocated ust app channel, create the channel buffers if |
2535 | * need and send it to the application. This MUST be called with a RCU read | |
2536 | * side lock acquired. | |
2537 | * | |
2538 | * Return 0 on success or else a negative value. | |
78f0bacd | 2539 | */ |
7972aab2 DG |
2540 | static int do_create_channel(struct ust_app *app, |
2541 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2542 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2543 | { |
7972aab2 | 2544 | int ret; |
78f0bacd | 2545 | |
7972aab2 DG |
2546 | assert(app); |
2547 | assert(usess); | |
2548 | assert(ua_sess); | |
2549 | assert(ua_chan); | |
2550 | ||
2551 | /* Handle buffer type before sending the channel to the application. */ | |
2552 | switch (usess->buffer_type) { | |
2553 | case LTTNG_BUFFER_PER_UID: | |
2554 | { | |
2555 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
2556 | if (ret < 0) { | |
2557 | goto error; | |
2558 | } | |
2559 | break; | |
2560 | } | |
2561 | case LTTNG_BUFFER_PER_PID: | |
2562 | { | |
2563 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
2564 | if (ret < 0) { | |
2565 | goto error; | |
2566 | } | |
2567 | break; | |
2568 | } | |
2569 | default: | |
2570 | assert(0); | |
2571 | ret = -EINVAL; | |
78f0bacd DG |
2572 | goto error; |
2573 | } | |
2574 | ||
7972aab2 DG |
2575 | /* Initialize ust objd object using the received handle and add it. */ |
2576 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
2577 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 2578 | |
7972aab2 DG |
2579 | /* If channel is not enabled, disable it on the tracer */ |
2580 | if (!ua_chan->enabled) { | |
2581 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2582 | if (ret < 0) { | |
2583 | goto error; | |
2584 | } | |
78f0bacd DG |
2585 | } |
2586 | ||
2587 | error: | |
2588 | return ret; | |
2589 | } | |
2590 | ||
284d8f55 | 2591 | /* |
4d710ac2 DG |
2592 | * Create UST app channel and create it on the tracer. Set ua_chanp of the |
2593 | * newly created channel if not NULL. | |
d0b96690 | 2594 | * |
36b588ed | 2595 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 DG |
2596 | * |
2597 | * Return 0 on success or else a negative value. | |
284d8f55 | 2598 | */ |
4d710ac2 DG |
2599 | static int create_ust_app_channel(struct ust_app_session *ua_sess, |
2600 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
7972aab2 | 2601 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 2602 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
2603 | { |
2604 | int ret = 0; | |
bec39940 DG |
2605 | struct lttng_ht_iter iter; |
2606 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
2607 | struct ust_app_channel *ua_chan; |
2608 | ||
2609 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
2610 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
2611 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 2612 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 2613 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 2614 | goto end; |
5b4a0ec0 DG |
2615 | } |
2616 | ||
d0b96690 | 2617 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
2618 | if (ua_chan == NULL) { |
2619 | /* Only malloc can fail here */ | |
4d710ac2 | 2620 | ret = -ENOMEM; |
094d1690 | 2621 | goto error_alloc; |
fc34caaa DG |
2622 | } |
2623 | shadow_copy_channel(ua_chan, uchan); | |
2624 | ||
ffe60014 DG |
2625 | /* Set channel type. */ |
2626 | ua_chan->attr.type = type; | |
2627 | ||
7972aab2 | 2628 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
5b4a0ec0 DG |
2629 | if (ret < 0) { |
2630 | goto error; | |
2631 | } | |
2632 | ||
fc34caaa | 2633 | DBG2("UST app create channel %s for PID %d completed", ua_chan->name, |
852d0037 | 2634 | app->pid); |
fc34caaa | 2635 | |
d0b96690 DG |
2636 | /* Only add the channel if successful on the tracer side. */ |
2637 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
2638 | ||
fc34caaa | 2639 | end: |
4d710ac2 DG |
2640 | if (ua_chanp) { |
2641 | *ua_chanp = ua_chan; | |
2642 | } | |
2643 | ||
2644 | /* Everything went well. */ | |
2645 | return 0; | |
5b4a0ec0 DG |
2646 | |
2647 | error: | |
d0b96690 | 2648 | delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app); |
094d1690 | 2649 | error_alloc: |
4d710ac2 | 2650 | return ret; |
5b4a0ec0 DG |
2651 | } |
2652 | ||
2653 | /* | |
2654 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
2655 | * |
2656 | * Called with ust app session mutex held. | |
5b4a0ec0 | 2657 | */ |
edb67388 DG |
2658 | static |
2659 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
2660 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
2661 | struct ust_app *app) | |
284d8f55 | 2662 | { |
edb67388 | 2663 | int ret = 0; |
5b4a0ec0 | 2664 | struct ust_app_event *ua_event; |
284d8f55 | 2665 | |
5b4a0ec0 | 2666 | /* Get event node */ |
18eace3b | 2667 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 2668 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 2669 | if (ua_event != NULL) { |
fc34caaa | 2670 | ret = -EEXIST; |
edb67388 DG |
2671 | goto end; |
2672 | } | |
5b4a0ec0 | 2673 | |
edb67388 DG |
2674 | /* Does not exist so create one */ |
2675 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); | |
2676 | if (ua_event == NULL) { | |
2677 | /* Only malloc can failed so something is really wrong */ | |
2678 | ret = -ENOMEM; | |
fc34caaa | 2679 | goto end; |
5b4a0ec0 | 2680 | } |
edb67388 | 2681 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 2682 | |
edb67388 | 2683 | /* Create it on the tracer side */ |
5b4a0ec0 | 2684 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 2685 | if (ret < 0) { |
fc34caaa | 2686 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 2687 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
2688 | goto error; |
2689 | } | |
2690 | ||
d0b96690 | 2691 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 2692 | |
fc34caaa | 2693 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 2694 | app->pid); |
7f79d3a1 | 2695 | |
edb67388 | 2696 | end: |
fc34caaa DG |
2697 | return ret; |
2698 | ||
5b4a0ec0 | 2699 | error: |
fc34caaa DG |
2700 | /* Valid. Calling here is already in a read side lock */ |
2701 | delete_ust_app_event(-1, ua_event); | |
edb67388 | 2702 | return ret; |
5b4a0ec0 DG |
2703 | } |
2704 | ||
2705 | /* | |
2706 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 2707 | * |
7972aab2 | 2708 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
2709 | */ |
2710 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
d65d2de8 DG |
2711 | struct ust_app *app, struct consumer_output *consumer, |
2712 | struct ustctl_consumer_channel_attr *attr) | |
5b4a0ec0 DG |
2713 | { |
2714 | int ret = 0; | |
ffe60014 | 2715 | struct ust_app_channel *metadata; |
d88aee68 | 2716 | struct consumer_socket *socket; |
7972aab2 | 2717 | struct ust_registry_session *registry; |
5b4a0ec0 | 2718 | |
ffe60014 DG |
2719 | assert(ua_sess); |
2720 | assert(app); | |
d88aee68 | 2721 | assert(consumer); |
5b4a0ec0 | 2722 | |
7972aab2 DG |
2723 | registry = get_session_registry(ua_sess); |
2724 | assert(registry); | |
2725 | ||
1b532a60 DG |
2726 | /* Metadata already exists for this registry or it was closed previously */ |
2727 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
2728 | ret = 0; |
2729 | goto error; | |
5b4a0ec0 DG |
2730 | } |
2731 | ||
ffe60014 | 2732 | /* Allocate UST metadata */ |
d0b96690 | 2733 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
2734 | if (!metadata) { |
2735 | /* malloc() failed */ | |
2736 | ret = -ENOMEM; | |
2737 | goto error; | |
2738 | } | |
5b4a0ec0 | 2739 | |
d65d2de8 DG |
2740 | if (!attr) { |
2741 | /* Set default attributes for metadata. */ | |
2742 | metadata->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
2743 | metadata->attr.subbuf_size = default_get_metadata_subbuf_size(); | |
2744 | metadata->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM; | |
0a9c6494 DG |
2745 | metadata->attr.switch_timer_interval = DEFAULT_METADATA_SWITCH_TIMER; |
2746 | metadata->attr.read_timer_interval = DEFAULT_METADATA_READ_TIMER; | |
d65d2de8 DG |
2747 | metadata->attr.output = LTTNG_UST_MMAP; |
2748 | metadata->attr.type = LTTNG_UST_CHAN_METADATA; | |
2749 | } else { | |
2750 | memcpy(&metadata->attr, attr, sizeof(metadata->attr)); | |
2751 | metadata->attr.output = LTTNG_UST_MMAP; | |
2752 | metadata->attr.type = LTTNG_UST_CHAN_METADATA; | |
2753 | } | |
5b4a0ec0 | 2754 | |
7972aab2 DG |
2755 | /* Need one fd for the channel. */ |
2756 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2757 | if (ret < 0) { | |
2758 | ERR("Exhausted number of available FD upon create metadata"); | |
2759 | goto error; | |
2760 | } | |
2761 | ||
4dc3dfc5 DG |
2762 | /* Get the right consumer socket for the application. */ |
2763 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
2764 | if (!socket) { | |
2765 | ret = -EINVAL; | |
2766 | goto error_consumer; | |
2767 | } | |
2768 | ||
331744e3 JD |
2769 | /* |
2770 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
2771 | * to the registry *before* we ask the consumer so we avoid the race of the | |
2772 | * consumer requesting the metadata and the ask_channel call on our side | |
2773 | * did not returned yet. | |
2774 | */ | |
2775 | registry->metadata_key = metadata->key; | |
2776 | ||
d88aee68 DG |
2777 | /* |
2778 | * Ask the metadata channel creation to the consumer. The metadata object | |
2779 | * will be created by the consumer and kept their. However, the stream is | |
2780 | * never added or monitored until we do a first push metadata to the | |
2781 | * consumer. | |
2782 | */ | |
7972aab2 DG |
2783 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
2784 | registry); | |
d88aee68 | 2785 | if (ret < 0) { |
f2a444f1 DG |
2786 | /* Nullify the metadata key so we don't try to close it later on. */ |
2787 | registry->metadata_key = 0; | |
d88aee68 DG |
2788 | goto error_consumer; |
2789 | } | |
2790 | ||
2791 | /* | |
2792 | * The setup command will make the metadata stream be sent to the relayd, | |
2793 | * if applicable, and the thread managing the metadatas. This is important | |
2794 | * because after this point, if an error occurs, the only way the stream | |
2795 | * can be deleted is to be monitored in the consumer. | |
2796 | */ | |
7972aab2 | 2797 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 2798 | if (ret < 0) { |
f2a444f1 DG |
2799 | /* Nullify the metadata key so we don't try to close it later on. */ |
2800 | registry->metadata_key = 0; | |
d88aee68 | 2801 | goto error_consumer; |
5b4a0ec0 DG |
2802 | } |
2803 | ||
7972aab2 DG |
2804 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
2805 | metadata->key, app->pid); | |
5b4a0ec0 | 2806 | |
d88aee68 | 2807 | error_consumer: |
b80f0b6c | 2808 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 2809 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 2810 | error: |
ffe60014 | 2811 | return ret; |
5b4a0ec0 DG |
2812 | } |
2813 | ||
2814 | /* | |
2815 | * Return pointer to traceable apps list. | |
2816 | */ | |
bec39940 | 2817 | struct lttng_ht *ust_app_get_ht(void) |
5b4a0ec0 DG |
2818 | { |
2819 | return ust_app_ht; | |
2820 | } | |
2821 | ||
2822 | /* | |
d88aee68 DG |
2823 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
2824 | * acquired before calling this function. | |
5b4a0ec0 DG |
2825 | */ |
2826 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
2827 | { | |
d88aee68 | 2828 | struct ust_app *app = NULL; |
bec39940 DG |
2829 | struct lttng_ht_node_ulong *node; |
2830 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 2831 | |
bec39940 DG |
2832 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
2833 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
2834 | if (node == NULL) { |
2835 | DBG2("UST app no found with pid %d", pid); | |
2836 | goto error; | |
2837 | } | |
5b4a0ec0 DG |
2838 | |
2839 | DBG2("Found UST app by pid %d", pid); | |
2840 | ||
d88aee68 | 2841 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
2842 | |
2843 | error: | |
d88aee68 | 2844 | return app; |
5b4a0ec0 DG |
2845 | } |
2846 | ||
d88aee68 DG |
2847 | /* |
2848 | * Allocate and init an UST app object using the registration information and | |
2849 | * the command socket. This is called when the command socket connects to the | |
2850 | * session daemon. | |
2851 | * | |
2852 | * The object is returned on success or else NULL. | |
2853 | */ | |
d0b96690 | 2854 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 2855 | { |
d0b96690 DG |
2856 | struct ust_app *lta = NULL; |
2857 | ||
2858 | assert(msg); | |
2859 | assert(sock >= 0); | |
2860 | ||
2861 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 2862 | |
173af62f DG |
2863 | if ((msg->bits_per_long == 64 && |
2864 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
2865 | || (msg->bits_per_long == 32 && | |
2866 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 2867 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
2868 | "%d-bit long, but no consumerd for this size is available.\n", |
2869 | msg->name, msg->pid, msg->bits_per_long); | |
2870 | goto error; | |
3f2c5fcc | 2871 | } |
d0b96690 | 2872 | |
5b4a0ec0 DG |
2873 | lta = zmalloc(sizeof(struct ust_app)); |
2874 | if (lta == NULL) { | |
2875 | PERROR("malloc"); | |
d0b96690 | 2876 | goto error; |
5b4a0ec0 DG |
2877 | } |
2878 | ||
2879 | lta->ppid = msg->ppid; | |
2880 | lta->uid = msg->uid; | |
2881 | lta->gid = msg->gid; | |
d0b96690 | 2882 | |
7753dea8 | 2883 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
2884 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
2885 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
2886 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
2887 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
2888 | lta->long_alignment = msg->long_alignment; | |
2889 | lta->byte_order = msg->byte_order; | |
2890 | ||
5b4a0ec0 DG |
2891 | lta->v_major = msg->major; |
2892 | lta->v_minor = msg->minor; | |
d9bf3ca4 | 2893 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 DG |
2894 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
2895 | lta->notify_sock = -1; | |
d88aee68 DG |
2896 | |
2897 | /* Copy name and make sure it's NULL terminated. */ | |
2898 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
2899 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
2900 | ||
2901 | /* | |
2902 | * Before this can be called, when receiving the registration information, | |
2903 | * the application compatibility is checked. So, at this point, the | |
2904 | * application can work with this session daemon. | |
2905 | */ | |
d0b96690 | 2906 | lta->compatible = 1; |
5b4a0ec0 | 2907 | |
852d0037 | 2908 | lta->pid = msg->pid; |
d0b96690 | 2909 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 2910 | lta->sock = sock; |
d0b96690 | 2911 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 2912 | |
d42f20df DG |
2913 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
2914 | ||
d0b96690 DG |
2915 | error: |
2916 | return lta; | |
2917 | } | |
2918 | ||
d88aee68 DG |
2919 | /* |
2920 | * For a given application object, add it to every hash table. | |
2921 | */ | |
d0b96690 DG |
2922 | void ust_app_add(struct ust_app *app) |
2923 | { | |
2924 | assert(app); | |
2925 | assert(app->notify_sock >= 0); | |
2926 | ||
5b4a0ec0 | 2927 | rcu_read_lock(); |
852d0037 DG |
2928 | |
2929 | /* | |
2930 | * On a re-registration, we want to kick out the previous registration of | |
2931 | * that pid | |
2932 | */ | |
d0b96690 | 2933 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
2934 | |
2935 | /* | |
2936 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
2937 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
2938 | * already in the table. | |
2939 | */ | |
d0b96690 | 2940 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 2941 | |
d0b96690 DG |
2942 | /* Add application to the notify socket hash table. */ |
2943 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
2944 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 2945 | |
d0b96690 | 2946 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
2947 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
2948 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
2949 | app->v_minor); | |
5b4a0ec0 | 2950 | |
d0b96690 DG |
2951 | rcu_read_unlock(); |
2952 | } | |
2953 | ||
d88aee68 DG |
2954 | /* |
2955 | * Set the application version into the object. | |
2956 | * | |
2957 | * Return 0 on success else a negative value either an errno code or a | |
2958 | * LTTng-UST error code. | |
2959 | */ | |
d0b96690 DG |
2960 | int ust_app_version(struct ust_app *app) |
2961 | { | |
d88aee68 DG |
2962 | int ret; |
2963 | ||
d0b96690 | 2964 | assert(app); |
d88aee68 DG |
2965 | |
2966 | ret = ustctl_tracer_version(app->sock, &app->version); | |
2967 | if (ret < 0) { | |
2968 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
2969 | ERR("UST app %d verson failed with ret %d", app->sock, ret); | |
2970 | } else { | |
2971 | DBG3("UST app %d verion failed. Application is dead", app->sock); | |
2972 | } | |
2973 | } | |
2974 | ||
2975 | return ret; | |
5b4a0ec0 DG |
2976 | } |
2977 | ||
2978 | /* | |
2979 | * Unregister app by removing it from the global traceable app list and freeing | |
2980 | * the data struct. | |
2981 | * | |
2982 | * The socket is already closed at this point so no close to sock. | |
2983 | */ | |
2984 | void ust_app_unregister(int sock) | |
2985 | { | |
2986 | struct ust_app *lta; | |
bec39940 DG |
2987 | struct lttng_ht_node_ulong *node; |
2988 | struct lttng_ht_iter iter; | |
d42f20df | 2989 | struct ust_app_session *ua_sess; |
525b0740 | 2990 | int ret; |
5b4a0ec0 DG |
2991 | |
2992 | rcu_read_lock(); | |
886459c6 | 2993 | |
5b4a0ec0 | 2994 | /* Get the node reference for a call_rcu */ |
852d0037 | 2995 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 2996 | node = lttng_ht_iter_get_node_ulong(&iter); |
d0b96690 | 2997 | assert(node); |
284d8f55 | 2998 | |
852d0037 | 2999 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
3000 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
3001 | ||
886459c6 | 3002 | /* Remove application from PID hash table */ |
852d0037 DG |
3003 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
3004 | assert(!ret); | |
3005 | ||
d88aee68 DG |
3006 | /* |
3007 | * Remove application from notify hash table. The thread handling the | |
3008 | * notify socket could have deleted the node so ignore on error because | |
3009 | * either way it's valid. The close of that socket is handled by the other | |
3010 | * thread. | |
3011 | */ | |
d0b96690 | 3012 | iter.iter.node = <a->notify_sock_n.node; |
d88aee68 | 3013 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); |
852d0037 | 3014 | |
5b98a774 DG |
3015 | /* |
3016 | * Ignore return value since the node might have been removed before by an | |
3017 | * add replace during app registration because the PID can be reassigned by | |
3018 | * the OS. | |
3019 | */ | |
d0b96690 | 3020 | iter.iter.node = <a->pid_n.node; |
bec39940 | 3021 | ret = lttng_ht_del(ust_app_ht, &iter); |
5b98a774 DG |
3022 | if (ret) { |
3023 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
3024 | lta->pid); | |
3025 | } | |
852d0037 | 3026 | |
d42f20df DG |
3027 | /* Remove sessions so they are not visible during deletion.*/ |
3028 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, | |
3029 | node.node) { | |
7972aab2 DG |
3030 | struct ust_registry_session *registry; |
3031 | ||
d42f20df DG |
3032 | ret = lttng_ht_del(lta->sessions, &iter); |
3033 | if (ret) { | |
3034 | /* The session was already removed so scheduled for teardown. */ | |
3035 | continue; | |
3036 | } | |
3037 | ||
3038 | /* | |
3039 | * Add session to list for teardown. This is safe since at this point we | |
3040 | * are the only one using this list. | |
3041 | */ | |
d88aee68 DG |
3042 | pthread_mutex_lock(&ua_sess->lock); |
3043 | ||
3044 | /* | |
3045 | * Normally, this is done in the delete session process which is | |
3046 | * executed in the call rcu below. However, upon registration we can't | |
3047 | * afford to wait for the grace period before pushing data or else the | |
3048 | * data pending feature can race between the unregistration and stop | |
3049 | * command where the data pending command is sent *before* the grace | |
3050 | * period ended. | |
3051 | * | |
3052 | * The close metadata below nullifies the metadata pointer in the | |
3053 | * session so the delete session will NOT push/close a second time. | |
3054 | */ | |
7972aab2 | 3055 | registry = get_session_registry(ua_sess); |
1b532a60 | 3056 | if (registry && !registry->metadata_closed) { |
7972aab2 DG |
3057 | /* Push metadata for application before freeing the application. */ |
3058 | (void) push_metadata(registry, ua_sess->consumer); | |
3059 | ||
3060 | /* | |
3061 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
3062 | * metadata only on destroy trace session in this case. Also, the |
3063 | * previous push metadata could have flag the metadata registry to | |
3064 | * close so don't send a close command if closed. | |
7972aab2 | 3065 | */ |
1b532a60 DG |
3066 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID && |
3067 | !registry->metadata_closed) { | |
7972aab2 DG |
3068 | /* And ask to close it for this session registry. */ |
3069 | (void) close_metadata(registry, ua_sess->consumer); | |
3070 | } | |
3071 | } | |
d88aee68 | 3072 | |
d42f20df | 3073 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
d88aee68 | 3074 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
3075 | } |
3076 | ||
852d0037 DG |
3077 | /* Free memory */ |
3078 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
3079 | ||
5b4a0ec0 DG |
3080 | rcu_read_unlock(); |
3081 | return; | |
284d8f55 DG |
3082 | } |
3083 | ||
3084 | /* | |
5b4a0ec0 | 3085 | * Return traceable_app_count |
284d8f55 | 3086 | */ |
5b4a0ec0 | 3087 | unsigned long ust_app_list_count(void) |
284d8f55 | 3088 | { |
5b4a0ec0 | 3089 | unsigned long count; |
284d8f55 | 3090 | |
5b4a0ec0 | 3091 | rcu_read_lock(); |
bec39940 | 3092 | count = lttng_ht_get_count(ust_app_ht); |
5b4a0ec0 | 3093 | rcu_read_unlock(); |
284d8f55 | 3094 | |
5b4a0ec0 | 3095 | return count; |
284d8f55 DG |
3096 | } |
3097 | ||
5b4a0ec0 DG |
3098 | /* |
3099 | * Fill events array with all events name of all registered apps. | |
3100 | */ | |
3101 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 3102 | { |
5b4a0ec0 DG |
3103 | int ret, handle; |
3104 | size_t nbmem, count = 0; | |
bec39940 | 3105 | struct lttng_ht_iter iter; |
5b4a0ec0 | 3106 | struct ust_app *app; |
c617c0c6 | 3107 | struct lttng_event *tmp_event; |
421cb601 | 3108 | |
5b4a0ec0 | 3109 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
3110 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
3111 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
3112 | PERROR("zmalloc ust app events"); |
3113 | ret = -ENOMEM; | |
421cb601 DG |
3114 | goto error; |
3115 | } | |
3116 | ||
5b4a0ec0 | 3117 | rcu_read_lock(); |
421cb601 | 3118 | |
852d0037 | 3119 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 3120 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 3121 | |
840cb59c | 3122 | health_code_update(); |
86acf0da | 3123 | |
e0c7ec2b DG |
3124 | if (!app->compatible) { |
3125 | /* | |
3126 | * TODO: In time, we should notice the caller of this error by | |
3127 | * telling him that this is a version error. | |
3128 | */ | |
3129 | continue; | |
3130 | } | |
852d0037 | 3131 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 3132 | if (handle < 0) { |
ffe60014 DG |
3133 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3134 | ERR("UST app list events getting handle failed for app pid %d", | |
3135 | app->pid); | |
3136 | } | |
5b4a0ec0 DG |
3137 | continue; |
3138 | } | |
421cb601 | 3139 | |
852d0037 | 3140 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 3141 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3142 | /* Handle ustctl error. */ |
3143 | if (ret < 0) { | |
3144 | free(tmp_event); | |
3145 | if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) { | |
3146 | ERR("UST app tp list get failed for app %d with ret %d", | |
3147 | app->sock, ret); | |
3148 | } else { | |
3149 | DBG3("UST app tp list get failed. Application is dead"); | |
3757b385 DG |
3150 | /* |
3151 | * This is normal behavior, an application can die during the | |
3152 | * creation process. Don't report an error so the execution can | |
3153 | * continue normally. Continue normal execution. | |
3154 | */ | |
3155 | break; | |
ffe60014 DG |
3156 | } |
3157 | goto rcu_error; | |
3158 | } | |
3159 | ||
840cb59c | 3160 | health_code_update(); |
815564d8 | 3161 | if (count >= nbmem) { |
d7b3776f | 3162 | /* In case the realloc fails, we free the memory */ |
c617c0c6 MD |
3163 | void *ptr; |
3164 | ||
815564d8 MD |
3165 | DBG2("Reallocating event list from %zu to %zu entries", nbmem, |
3166 | 2 * nbmem); | |
3167 | nbmem *= 2; | |
c617c0c6 MD |
3168 | ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event)); |
3169 | if (ptr == NULL) { | |
5b4a0ec0 | 3170 | PERROR("realloc ust app events"); |
c617c0c6 | 3171 | free(tmp_event); |
5b4a0ec0 DG |
3172 | ret = -ENOMEM; |
3173 | goto rcu_error; | |
3174 | } | |
c617c0c6 | 3175 | tmp_event = ptr; |
5b4a0ec0 | 3176 | } |
c617c0c6 MD |
3177 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
3178 | tmp_event[count].loglevel = uiter.loglevel; | |
3179 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
3180 | tmp_event[count].pid = app->pid; | |
3181 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 3182 | count++; |
421cb601 | 3183 | } |
421cb601 DG |
3184 | } |
3185 | ||
5b4a0ec0 | 3186 | ret = count; |
c617c0c6 | 3187 | *events = tmp_event; |
421cb601 | 3188 | |
5b4a0ec0 | 3189 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 3190 | |
5b4a0ec0 DG |
3191 | rcu_error: |
3192 | rcu_read_unlock(); | |
421cb601 | 3193 | error: |
840cb59c | 3194 | health_code_update(); |
5b4a0ec0 | 3195 | return ret; |
421cb601 DG |
3196 | } |
3197 | ||
f37d259d MD |
3198 | /* |
3199 | * Fill events array with all events name of all registered apps. | |
3200 | */ | |
3201 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
3202 | { | |
3203 | int ret, handle; | |
3204 | size_t nbmem, count = 0; | |
3205 | struct lttng_ht_iter iter; | |
3206 | struct ust_app *app; | |
c617c0c6 | 3207 | struct lttng_event_field *tmp_event; |
f37d259d MD |
3208 | |
3209 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
3210 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
3211 | if (tmp_event == NULL) { | |
f37d259d MD |
3212 | PERROR("zmalloc ust app event fields"); |
3213 | ret = -ENOMEM; | |
3214 | goto error; | |
3215 | } | |
3216 | ||
3217 | rcu_read_lock(); | |
3218 | ||
3219 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3220 | struct lttng_ust_field_iter uiter; | |
3221 | ||
840cb59c | 3222 | health_code_update(); |
86acf0da | 3223 | |
f37d259d MD |
3224 | if (!app->compatible) { |
3225 | /* | |
3226 | * TODO: In time, we should notice the caller of this error by | |
3227 | * telling him that this is a version error. | |
3228 | */ | |
3229 | continue; | |
3230 | } | |
3231 | handle = ustctl_tracepoint_field_list(app->sock); | |
3232 | if (handle < 0) { | |
ffe60014 DG |
3233 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3234 | ERR("UST app list field getting handle failed for app pid %d", | |
3235 | app->pid); | |
3236 | } | |
f37d259d MD |
3237 | continue; |
3238 | } | |
3239 | ||
3240 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 3241 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3242 | /* Handle ustctl error. */ |
3243 | if (ret < 0) { | |
3244 | free(tmp_event); | |
3245 | if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) { | |
3246 | ERR("UST app tp list field failed for app %d with ret %d", | |
3247 | app->sock, ret); | |
3248 | } else { | |
3249 | DBG3("UST app tp list field failed. Application is dead"); | |
3757b385 DG |
3250 | /* |
3251 | * This is normal behavior, an application can die during the | |
3252 | * creation process. Don't report an error so the execution can | |
3253 | * continue normally. | |
3254 | */ | |
3255 | break; | |
ffe60014 DG |
3256 | } |
3257 | goto rcu_error; | |
3258 | } | |
3259 | ||
840cb59c | 3260 | health_code_update(); |
f37d259d | 3261 | if (count >= nbmem) { |
d7b3776f | 3262 | /* In case the realloc fails, we free the memory */ |
c617c0c6 MD |
3263 | void *ptr; |
3264 | ||
f37d259d MD |
3265 | DBG2("Reallocating event field list from %zu to %zu entries", nbmem, |
3266 | 2 * nbmem); | |
3267 | nbmem *= 2; | |
c617c0c6 MD |
3268 | ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event_field)); |
3269 | if (ptr == NULL) { | |
f37d259d | 3270 | PERROR("realloc ust app event fields"); |
c617c0c6 | 3271 | free(tmp_event); |
f37d259d MD |
3272 | ret = -ENOMEM; |
3273 | goto rcu_error; | |
3274 | } | |
c617c0c6 | 3275 | tmp_event = ptr; |
f37d259d | 3276 | } |
f37d259d | 3277 | |
c617c0c6 | 3278 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
2e84128e DG |
3279 | /* Mapping between these enums matches 1 to 1. */ |
3280 | tmp_event[count].type = (enum lttng_event_field_type) uiter.type; | |
c617c0c6 | 3281 | tmp_event[count].nowrite = uiter.nowrite; |
f37d259d | 3282 | |
c617c0c6 MD |
3283 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
3284 | tmp_event[count].event.loglevel = uiter.loglevel; | |
2e84128e | 3285 | tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; |
c617c0c6 MD |
3286 | tmp_event[count].event.pid = app->pid; |
3287 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
3288 | count++; |
3289 | } | |
3290 | } | |
3291 | ||
3292 | ret = count; | |
c617c0c6 | 3293 | *fields = tmp_event; |
f37d259d MD |
3294 | |
3295 | DBG2("UST app list event fields done (%zu events)", count); | |
3296 | ||
3297 | rcu_error: | |
3298 | rcu_read_unlock(); | |
3299 | error: | |
840cb59c | 3300 | health_code_update(); |
f37d259d MD |
3301 | return ret; |
3302 | } | |
3303 | ||
5b4a0ec0 DG |
3304 | /* |
3305 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
3306 | * |
3307 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
3308 | */ |
3309 | void ust_app_clean_list(void) | |
421cb601 | 3310 | { |
5b4a0ec0 | 3311 | int ret; |
659ed79f | 3312 | struct ust_app *app; |
bec39940 | 3313 | struct lttng_ht_iter iter; |
421cb601 | 3314 | |
5b4a0ec0 | 3315 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3316 | |
5b4a0ec0 | 3317 | rcu_read_lock(); |
421cb601 | 3318 | |
659ed79f | 3319 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3320 | ret = lttng_ht_del(ust_app_ht, &iter); |
525b0740 | 3321 | assert(!ret); |
659ed79f | 3322 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); |
421cb601 DG |
3323 | } |
3324 | ||
852d0037 | 3325 | /* Cleanup socket hash table */ |
659ed79f DG |
3326 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, |
3327 | sock_n.node) { | |
852d0037 | 3328 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
bec39940 DG |
3329 | assert(!ret); |
3330 | } | |
852d0037 | 3331 | |
d88aee68 DG |
3332 | /* Cleanup notify socket hash table */ |
3333 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3334 | notify_sock_n.node) { | |
3335 | ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3336 | assert(!ret); | |
3337 | } | |
36b588ed | 3338 | rcu_read_unlock(); |
d88aee68 | 3339 | |
bec39940 | 3340 | /* Destroy is done only when the ht is empty */ |
0b2dc8df MD |
3341 | ht_cleanup_push(ust_app_ht); |
3342 | ht_cleanup_push(ust_app_ht_by_sock); | |
3343 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
5b4a0ec0 DG |
3344 | } |
3345 | ||
3346 | /* | |
3347 | * Init UST app hash table. | |
3348 | */ | |
3349 | void ust_app_ht_alloc(void) | |
3350 | { | |
bec39940 | 3351 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
852d0037 | 3352 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3353 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
421cb601 DG |
3354 | } |
3355 | ||
78f0bacd DG |
3356 | /* |
3357 | * For a specific UST session, disable the channel for all registered apps. | |
3358 | */ | |
35a9059d | 3359 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3360 | struct ltt_ust_channel *uchan) |
3361 | { | |
3362 | int ret = 0; | |
bec39940 DG |
3363 | struct lttng_ht_iter iter; |
3364 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3365 | struct ust_app *app; |
3366 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3367 | struct ust_app_channel *ua_chan; |
78f0bacd DG |
3368 | |
3369 | if (usess == NULL || uchan == NULL) { | |
3370 | ERR("Disabling UST global channel with NULL values"); | |
3371 | ret = -1; | |
3372 | goto error; | |
3373 | } | |
3374 | ||
d9bf3ca4 | 3375 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 3376 | uchan->name, usess->id); |
78f0bacd DG |
3377 | |
3378 | rcu_read_lock(); | |
3379 | ||
3380 | /* For every registered applications */ | |
852d0037 | 3381 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3382 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3383 | if (!app->compatible) { |
3384 | /* | |
3385 | * TODO: In time, we should notice the caller of this error by | |
3386 | * telling him that this is a version error. | |
3387 | */ | |
3388 | continue; | |
3389 | } | |
78f0bacd DG |
3390 | ua_sess = lookup_session_by_app(usess, app); |
3391 | if (ua_sess == NULL) { | |
3392 | continue; | |
3393 | } | |
3394 | ||
8535a6d9 | 3395 | /* Get channel */ |
bec39940 DG |
3396 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3397 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
3398 | /* If the session if found for the app, the channel must be there */ |
3399 | assert(ua_chan_node); | |
3400 | ||
3401 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3402 | /* The channel must not be already disabled */ | |
3403 | assert(ua_chan->enabled == 1); | |
3404 | ||
3405 | /* Disable channel onto application */ | |
3406 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
3407 | if (ret < 0) { |
3408 | /* XXX: We might want to report this error at some point... */ | |
3409 | continue; | |
3410 | } | |
3411 | } | |
3412 | ||
3413 | rcu_read_unlock(); | |
3414 | ||
3415 | error: | |
3416 | return ret; | |
3417 | } | |
3418 | ||
3419 | /* | |
3420 | * For a specific UST session, enable the channel for all registered apps. | |
3421 | */ | |
35a9059d | 3422 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3423 | struct ltt_ust_channel *uchan) |
3424 | { | |
3425 | int ret = 0; | |
bec39940 | 3426 | struct lttng_ht_iter iter; |
78f0bacd DG |
3427 | struct ust_app *app; |
3428 | struct ust_app_session *ua_sess; | |
3429 | ||
3430 | if (usess == NULL || uchan == NULL) { | |
3431 | ERR("Adding UST global channel to NULL values"); | |
3432 | ret = -1; | |
3433 | goto error; | |
3434 | } | |
3435 | ||
d9bf3ca4 | 3436 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 3437 | uchan->name, usess->id); |
78f0bacd DG |
3438 | |
3439 | rcu_read_lock(); | |
3440 | ||
3441 | /* For every registered applications */ | |
852d0037 | 3442 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3443 | if (!app->compatible) { |
3444 | /* | |
3445 | * TODO: In time, we should notice the caller of this error by | |
3446 | * telling him that this is a version error. | |
3447 | */ | |
3448 | continue; | |
3449 | } | |
78f0bacd DG |
3450 | ua_sess = lookup_session_by_app(usess, app); |
3451 | if (ua_sess == NULL) { | |
3452 | continue; | |
3453 | } | |
3454 | ||
3455 | /* Enable channel onto application */ | |
3456 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
3457 | if (ret < 0) { | |
3458 | /* XXX: We might want to report this error at some point... */ | |
3459 | continue; | |
3460 | } | |
3461 | } | |
3462 | ||
3463 | rcu_read_unlock(); | |
3464 | ||
3465 | error: | |
3466 | return ret; | |
3467 | } | |
3468 | ||
b0a40d28 DG |
3469 | /* |
3470 | * Disable an event in a channel and for a specific session. | |
3471 | */ | |
35a9059d DG |
3472 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
3473 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
3474 | { |
3475 | int ret = 0; | |
bec39940 DG |
3476 | struct lttng_ht_iter iter, uiter; |
3477 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
b0a40d28 DG |
3478 | struct ust_app *app; |
3479 | struct ust_app_session *ua_sess; | |
3480 | struct ust_app_channel *ua_chan; | |
3481 | struct ust_app_event *ua_event; | |
3482 | ||
3483 | DBG("UST app disabling event %s for all apps in channel " | |
d9bf3ca4 MD |
3484 | "%s for session id %" PRIu64, |
3485 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
3486 | |
3487 | rcu_read_lock(); | |
3488 | ||
3489 | /* For all registered applications */ | |
852d0037 | 3490 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3491 | if (!app->compatible) { |
3492 | /* | |
3493 | * TODO: In time, we should notice the caller of this error by | |
3494 | * telling him that this is a version error. | |
3495 | */ | |
3496 | continue; | |
3497 | } | |
b0a40d28 DG |
3498 | ua_sess = lookup_session_by_app(usess, app); |
3499 | if (ua_sess == NULL) { | |
3500 | /* Next app */ | |
3501 | continue; | |
3502 | } | |
3503 | ||
3504 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3505 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3506 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 3507 | if (ua_chan_node == NULL) { |
d9bf3ca4 | 3508 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 3509 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
3510 | continue; |
3511 | } | |
3512 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3513 | ||
bec39940 DG |
3514 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter); |
3515 | ua_event_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 DG |
3516 | if (ua_event_node == NULL) { |
3517 | DBG2("Event %s not found in channel %s for app pid %d." | |
852d0037 | 3518 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
3519 | continue; |
3520 | } | |
3521 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
3522 | ||
7f79d3a1 | 3523 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
3524 | if (ret < 0) { |
3525 | /* XXX: Report error someday... */ | |
3526 | continue; | |
3527 | } | |
3528 | } | |
3529 | ||
3530 | rcu_read_unlock(); | |
3531 | ||
3532 | return ret; | |
3533 | } | |
3534 | ||
9730260e | 3535 | /* |
edb67388 | 3536 | * For a specific UST session and UST channel, the event for all |
9730260e DG |
3537 | * registered apps. |
3538 | */ | |
35a9059d | 3539 | int ust_app_disable_all_event_glb(struct ltt_ust_session *usess, |
9730260e DG |
3540 | struct ltt_ust_channel *uchan) |
3541 | { | |
3542 | int ret = 0; | |
bec39940 DG |
3543 | struct lttng_ht_iter iter, uiter; |
3544 | struct lttng_ht_node_str *ua_chan_node; | |
9730260e DG |
3545 | struct ust_app *app; |
3546 | struct ust_app_session *ua_sess; | |
3547 | struct ust_app_channel *ua_chan; | |
3548 | struct ust_app_event *ua_event; | |
3549 | ||
3550 | DBG("UST app disabling all event for all apps in channel " | |
d9bf3ca4 | 3551 | "%s for session id %" PRIu64, uchan->name, usess->id); |
9730260e DG |
3552 | |
3553 | rcu_read_lock(); | |
3554 | ||
3555 | /* For all 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 | } | |
9730260e | 3564 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3565 | if (!ua_sess) { |
3566 | /* The application has problem or is probably dead. */ | |
3567 | continue; | |
3568 | } | |
9730260e DG |
3569 | |
3570 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3571 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3572 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3573 | /* If the channel is not found, there is a code flow error */ |
3574 | assert(ua_chan_node); | |
3575 | ||
9730260e DG |
3576 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3577 | ||
3578 | /* Disable each events of channel */ | |
bec39940 DG |
3579 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
3580 | node.node) { | |
7f79d3a1 | 3581 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
9730260e DG |
3582 | if (ret < 0) { |
3583 | /* XXX: Report error someday... */ | |
3584 | continue; | |
3585 | } | |
3586 | } | |
3587 | } | |
3588 | ||
3589 | rcu_read_unlock(); | |
3590 | ||
3591 | return ret; | |
3592 | } | |
3593 | ||
421cb601 | 3594 | /* |
5b4a0ec0 | 3595 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 3596 | */ |
35a9059d | 3597 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3598 | struct ltt_ust_channel *uchan) |
3599 | { | |
3d8ca23b | 3600 | int ret = 0, created; |
bec39940 | 3601 | struct lttng_ht_iter iter; |
48842b30 | 3602 | struct ust_app *app; |
3d8ca23b | 3603 | struct ust_app_session *ua_sess = NULL; |
48842b30 | 3604 | |
fc34caaa DG |
3605 | /* Very wrong code flow */ |
3606 | assert(usess); | |
3607 | assert(uchan); | |
421cb601 | 3608 | |
d9bf3ca4 | 3609 | DBG2("UST app adding channel %s to UST domain for session id %" PRIu64, |
a991f516 | 3610 | uchan->name, usess->id); |
48842b30 DG |
3611 | |
3612 | rcu_read_lock(); | |
421cb601 | 3613 | |
5b4a0ec0 | 3614 | /* For every registered applications */ |
852d0037 | 3615 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3616 | if (!app->compatible) { |
3617 | /* | |
3618 | * TODO: In time, we should notice the caller of this error by | |
3619 | * telling him that this is a version error. | |
3620 | */ | |
3621 | continue; | |
3622 | } | |
edb67388 DG |
3623 | /* |
3624 | * Create session on the tracer side and add it to app session HT. Note | |
3625 | * that if session exist, it will simply return a pointer to the ust | |
3626 | * app session. | |
3627 | */ | |
3d8ca23b DG |
3628 | ret = create_ust_app_session(usess, app, &ua_sess, &created); |
3629 | if (ret < 0) { | |
3630 | switch (ret) { | |
3631 | case -ENOTCONN: | |
3632 | /* | |
3633 | * The application's socket is not valid. Either a bad socket | |
3634 | * or a timeout on it. We can't inform the caller that for a | |
3635 | * specific app, the session failed so lets continue here. | |
3636 | */ | |
3637 | continue; | |
3638 | case -ENOMEM: | |
3639 | default: | |
3640 | goto error_rcu_unlock; | |
3641 | } | |
48842b30 | 3642 | } |
3d8ca23b | 3643 | assert(ua_sess); |
48842b30 | 3644 | |
d0b96690 | 3645 | pthread_mutex_lock(&ua_sess->lock); |
d65d2de8 DG |
3646 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, |
3647 | sizeof(uchan->name))) { | |
3648 | struct ustctl_consumer_channel_attr attr; | |
3649 | copy_channel_attr_to_ustctl(&attr, &uchan->attr); | |
3650 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, | |
3651 | &attr); | |
3652 | } else { | |
3653 | /* Create channel onto application. We don't need the chan ref. */ | |
3654 | ret = create_ust_app_channel(ua_sess, uchan, app, | |
3655 | LTTNG_UST_CHAN_PER_CPU, usess, NULL); | |
3656 | } | |
d0b96690 | 3657 | pthread_mutex_unlock(&ua_sess->lock); |
3d8ca23b DG |
3658 | if (ret < 0) { |
3659 | if (ret == -ENOMEM) { | |
3660 | /* No more memory is a fatal error. Stop right now. */ | |
3661 | goto error_rcu_unlock; | |
3662 | } | |
3663 | /* Cleanup the created session if it's the case. */ | |
3664 | if (created) { | |
d0b96690 | 3665 | destroy_app_session(app, ua_sess); |
3d8ca23b | 3666 | } |
48842b30 | 3667 | } |
48842b30 | 3668 | } |
5b4a0ec0 | 3669 | |
95e047ff | 3670 | error_rcu_unlock: |
48842b30 | 3671 | rcu_read_unlock(); |
3c14c33f | 3672 | return ret; |
48842b30 DG |
3673 | } |
3674 | ||
5b4a0ec0 | 3675 | /* |
edb67388 | 3676 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 3677 | */ |
35a9059d | 3678 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3679 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3680 | { | |
3681 | int ret = 0; | |
bec39940 | 3682 | struct lttng_ht_iter iter, uiter; |
18eace3b | 3683 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
3684 | struct ust_app *app; |
3685 | struct ust_app_session *ua_sess; | |
3686 | struct ust_app_channel *ua_chan; | |
3687 | struct ust_app_event *ua_event; | |
48842b30 | 3688 | |
d9bf3ca4 | 3689 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 3690 | uevent->attr.name, usess->id); |
48842b30 | 3691 | |
edb67388 DG |
3692 | /* |
3693 | * NOTE: At this point, this function is called only if the session and | |
3694 | * channel passed are already created for all apps. and enabled on the | |
3695 | * tracer also. | |
3696 | */ | |
3697 | ||
48842b30 | 3698 | rcu_read_lock(); |
421cb601 DG |
3699 | |
3700 | /* For all registered applications */ | |
852d0037 | 3701 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3702 | if (!app->compatible) { |
3703 | /* | |
3704 | * TODO: In time, we should notice the caller of this error by | |
3705 | * telling him that this is a version error. | |
3706 | */ | |
3707 | continue; | |
3708 | } | |
edb67388 | 3709 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3710 | if (!ua_sess) { |
3711 | /* The application has problem or is probably dead. */ | |
3712 | continue; | |
3713 | } | |
ba767faf | 3714 | |
d0b96690 DG |
3715 | pthread_mutex_lock(&ua_sess->lock); |
3716 | ||
edb67388 | 3717 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3718 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3719 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3720 | /* If the channel is not found, there is a code flow error */ |
3721 | assert(ua_chan_node); | |
3722 | ||
3723 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3724 | ||
18eace3b DG |
3725 | /* Get event node */ |
3726 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
39c5a3a7 | 3727 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 3728 | if (ua_event == NULL) { |
7f79d3a1 | 3729 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 3730 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 3731 | goto next_app; |
35a9059d | 3732 | } |
35a9059d DG |
3733 | |
3734 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
3735 | if (ret < 0) { | |
d0b96690 | 3736 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 3737 | goto error; |
48842b30 | 3738 | } |
d0b96690 DG |
3739 | next_app: |
3740 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
3741 | } |
3742 | ||
7f79d3a1 | 3743 | error: |
edb67388 | 3744 | rcu_read_unlock(); |
edb67388 DG |
3745 | return ret; |
3746 | } | |
3747 | ||
3748 | /* | |
3749 | * For a specific existing UST session and UST channel, creates the event for | |
3750 | * all registered apps. | |
3751 | */ | |
35a9059d | 3752 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
3753 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3754 | { | |
3755 | int ret = 0; | |
bec39940 DG |
3756 | struct lttng_ht_iter iter, uiter; |
3757 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
3758 | struct ust_app *app; |
3759 | struct ust_app_session *ua_sess; | |
3760 | struct ust_app_channel *ua_chan; | |
3761 | ||
d9bf3ca4 | 3762 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 3763 | uevent->attr.name, usess->id); |
edb67388 | 3764 | |
edb67388 DG |
3765 | rcu_read_lock(); |
3766 | ||
3767 | /* For all registered applications */ | |
852d0037 | 3768 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3769 | if (!app->compatible) { |
3770 | /* | |
3771 | * TODO: In time, we should notice the caller of this error by | |
3772 | * telling him that this is a version error. | |
3773 | */ | |
3774 | continue; | |
3775 | } | |
edb67388 | 3776 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3777 | if (!ua_sess) { |
3778 | /* The application has problem or is probably dead. */ | |
3779 | continue; | |
3780 | } | |
48842b30 | 3781 | |
d0b96690 | 3782 | pthread_mutex_lock(&ua_sess->lock); |
48842b30 | 3783 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3784 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3785 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3786 | /* If the channel is not found, there is a code flow error */ |
3787 | assert(ua_chan_node); | |
3788 | ||
48842b30 DG |
3789 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3790 | ||
edb67388 | 3791 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 3792 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 3793 | if (ret < 0) { |
49c336c1 | 3794 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
3795 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
3796 | break; | |
3797 | } | |
3798 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 3799 | uevent->attr.name, app->pid); |
5b4a0ec0 | 3800 | continue; |
48842b30 | 3801 | } |
48842b30 | 3802 | } |
5b4a0ec0 | 3803 | |
48842b30 DG |
3804 | rcu_read_unlock(); |
3805 | ||
3806 | return ret; | |
3807 | } | |
3808 | ||
5b4a0ec0 DG |
3809 | /* |
3810 | * Start tracing for a specific UST session and app. | |
3811 | */ | |
b34cbebf | 3812 | static |
421cb601 | 3813 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
3814 | { |
3815 | int ret = 0; | |
48842b30 | 3816 | struct ust_app_session *ua_sess; |
48842b30 | 3817 | |
852d0037 | 3818 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 3819 | |
509cbaf8 MD |
3820 | rcu_read_lock(); |
3821 | ||
e0c7ec2b DG |
3822 | if (!app->compatible) { |
3823 | goto end; | |
3824 | } | |
3825 | ||
421cb601 DG |
3826 | ua_sess = lookup_session_by_app(usess, app); |
3827 | if (ua_sess == NULL) { | |
d42f20df DG |
3828 | /* The session is in teardown process. Ignore and continue. */ |
3829 | goto end; | |
421cb601 | 3830 | } |
48842b30 | 3831 | |
d0b96690 DG |
3832 | pthread_mutex_lock(&ua_sess->lock); |
3833 | ||
aea829b3 DG |
3834 | /* Upon restart, we skip the setup, already done */ |
3835 | if (ua_sess->started) { | |
8be98f9a | 3836 | goto skip_setup; |
aea829b3 | 3837 | } |
8be98f9a | 3838 | |
a4b92340 DG |
3839 | /* Create directories if consumer is LOCAL and has a path defined. */ |
3840 | if (usess->consumer->type == CONSUMER_DST_LOCAL && | |
3841 | strlen(usess->consumer->dst.trace_path) > 0) { | |
3842 | ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path, | |
7972aab2 | 3843 | S_IRWXU | S_IRWXG, ua_sess->euid, ua_sess->egid); |
a4b92340 DG |
3844 | if (ret < 0) { |
3845 | if (ret != -EEXIST) { | |
3846 | ERR("Trace directory creation error"); | |
d0b96690 | 3847 | goto error_unlock; |
421cb601 | 3848 | } |
173af62f | 3849 | } |
7753dea8 | 3850 | } |
aea829b3 | 3851 | |
d65d2de8 DG |
3852 | /* |
3853 | * Create the metadata for the application. This returns gracefully if a | |
3854 | * metadata was already set for the session. | |
3855 | */ | |
3856 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, NULL); | |
421cb601 | 3857 | if (ret < 0) { |
d0b96690 | 3858 | goto error_unlock; |
421cb601 | 3859 | } |
48842b30 | 3860 | |
840cb59c | 3861 | health_code_update(); |
86acf0da | 3862 | |
8be98f9a | 3863 | skip_setup: |
421cb601 | 3864 | /* This start the UST tracing */ |
852d0037 | 3865 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
421cb601 | 3866 | if (ret < 0) { |
ffe60014 DG |
3867 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3868 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
3869 | app->pid, ret); | |
3870 | } else { | |
3871 | DBG("UST app start session failed. Application is dead."); | |
3757b385 DG |
3872 | /* |
3873 | * This is normal behavior, an application can die during the | |
3874 | * creation process. Don't report an error so the execution can | |
3875 | * continue normally. | |
3876 | */ | |
3877 | pthread_mutex_unlock(&ua_sess->lock); | |
3878 | goto end; | |
ffe60014 | 3879 | } |
d0b96690 | 3880 | goto error_unlock; |
421cb601 | 3881 | } |
5b4a0ec0 | 3882 | |
55c3953d DG |
3883 | /* Indicate that the session has been started once */ |
3884 | ua_sess->started = 1; | |
3885 | ||
d0b96690 DG |
3886 | pthread_mutex_unlock(&ua_sess->lock); |
3887 | ||
840cb59c | 3888 | health_code_update(); |
86acf0da | 3889 | |
421cb601 | 3890 | /* Quiescent wait after starting trace */ |
ffe60014 DG |
3891 | ret = ustctl_wait_quiescent(app->sock); |
3892 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3893 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3894 | app->pid, ret); | |
3895 | } | |
48842b30 | 3896 | |
e0c7ec2b DG |
3897 | end: |
3898 | rcu_read_unlock(); | |
840cb59c | 3899 | health_code_update(); |
421cb601 | 3900 | return 0; |
48842b30 | 3901 | |
d0b96690 DG |
3902 | error_unlock: |
3903 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 3904 | rcu_read_unlock(); |
840cb59c | 3905 | health_code_update(); |
421cb601 DG |
3906 | return -1; |
3907 | } | |
48842b30 | 3908 | |
8be98f9a MD |
3909 | /* |
3910 | * Stop tracing for a specific UST session and app. | |
3911 | */ | |
b34cbebf | 3912 | static |
8be98f9a MD |
3913 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
3914 | { | |
3915 | int ret = 0; | |
3916 | struct ust_app_session *ua_sess; | |
7972aab2 | 3917 | struct ust_registry_session *registry; |
8be98f9a | 3918 | |
852d0037 | 3919 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
3920 | |
3921 | rcu_read_lock(); | |
3922 | ||
e0c7ec2b | 3923 | if (!app->compatible) { |
d88aee68 | 3924 | goto end_no_session; |
e0c7ec2b DG |
3925 | } |
3926 | ||
8be98f9a MD |
3927 | ua_sess = lookup_session_by_app(usess, app); |
3928 | if (ua_sess == NULL) { | |
d88aee68 | 3929 | goto end_no_session; |
8be98f9a MD |
3930 | } |
3931 | ||
d88aee68 DG |
3932 | pthread_mutex_lock(&ua_sess->lock); |
3933 | ||
9bc07046 DG |
3934 | /* |
3935 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
3936 | * that was never started. It's possible since we can have a fail start |
3937 | * from either the application manager thread or the command thread. Simply | |
3938 | * indicate that this is a stop error. | |
9bc07046 | 3939 | */ |
f9dfc3d9 | 3940 | if (!ua_sess->started) { |
c45536e1 DG |
3941 | goto error_rcu_unlock; |
3942 | } | |
7db205b5 | 3943 | |
840cb59c | 3944 | health_code_update(); |
86acf0da | 3945 | |
9d6c7d3f | 3946 | /* This inhibits UST tracing */ |
852d0037 | 3947 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
9d6c7d3f | 3948 | if (ret < 0) { |
ffe60014 DG |
3949 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3950 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
3951 | app->pid, ret); | |
3952 | } else { | |
3953 | DBG("UST app stop session failed. Application is dead."); | |
3757b385 DG |
3954 | /* |
3955 | * This is normal behavior, an application can die during the | |
3956 | * creation process. Don't report an error so the execution can | |
3957 | * continue normally. | |
3958 | */ | |
3959 | goto end_unlock; | |
ffe60014 | 3960 | } |
9d6c7d3f DG |
3961 | goto error_rcu_unlock; |
3962 | } | |
3963 | ||
840cb59c | 3964 | health_code_update(); |
86acf0da | 3965 | |
9d6c7d3f | 3966 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
3967 | ret = ustctl_wait_quiescent(app->sock); |
3968 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3969 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3970 | app->pid, ret); | |
3971 | } | |
9d6c7d3f | 3972 | |
840cb59c | 3973 | health_code_update(); |
86acf0da | 3974 | |
b34cbebf MD |
3975 | registry = get_session_registry(ua_sess); |
3976 | assert(registry); | |
1b532a60 DG |
3977 | |
3978 | if (!registry->metadata_closed) { | |
3979 | /* Push metadata for application before freeing the application. */ | |
3980 | (void) push_metadata(registry, ua_sess->consumer); | |
3981 | } | |
b34cbebf | 3982 | |
3757b385 | 3983 | end_unlock: |
b34cbebf MD |
3984 | pthread_mutex_unlock(&ua_sess->lock); |
3985 | end_no_session: | |
3986 | rcu_read_unlock(); | |
3987 | health_code_update(); | |
3988 | return 0; | |
3989 | ||
3990 | error_rcu_unlock: | |
3991 | pthread_mutex_unlock(&ua_sess->lock); | |
3992 | rcu_read_unlock(); | |
3993 | health_code_update(); | |
3994 | return -1; | |
3995 | } | |
3996 | ||
3997 | /* | |
3998 | * Flush buffers for a specific UST session and app. | |
3999 | */ | |
4000 | static | |
4001 | int ust_app_flush_trace(struct ltt_ust_session *usess, struct ust_app *app) | |
4002 | { | |
4003 | int ret = 0; | |
4004 | struct lttng_ht_iter iter; | |
4005 | struct ust_app_session *ua_sess; | |
4006 | struct ust_app_channel *ua_chan; | |
4007 | ||
4008 | DBG("Flushing buffers for ust app pid %d", app->pid); | |
4009 | ||
4010 | rcu_read_lock(); | |
4011 | ||
4012 | if (!app->compatible) { | |
4013 | goto end_no_session; | |
4014 | } | |
4015 | ||
4016 | ua_sess = lookup_session_by_app(usess, app); | |
4017 | if (ua_sess == NULL) { | |
4018 | goto end_no_session; | |
4019 | } | |
4020 | ||
4021 | pthread_mutex_lock(&ua_sess->lock); | |
4022 | ||
4023 | health_code_update(); | |
4024 | ||
9d6c7d3f | 4025 | /* Flushing buffers */ |
bec39940 DG |
4026 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
4027 | node.node) { | |
840cb59c | 4028 | health_code_update(); |
ffe60014 | 4029 | assert(ua_chan->is_sent); |
852d0037 | 4030 | ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj); |
8be98f9a | 4031 | if (ret < 0) { |
ffe60014 DG |
4032 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4033 | ERR("UST app PID %d channel %s flush failed with ret %d", | |
4034 | app->pid, ua_chan->name, ret); | |
4035 | } else { | |
4036 | DBG3("UST app failed to flush %s. Application is dead.", | |
4037 | ua_chan->name); | |
3757b385 DG |
4038 | /* |
4039 | * This is normal behavior, an application can die during the | |
4040 | * creation process. Don't report an error so the execution can | |
4041 | * continue normally. | |
4042 | */ | |
ffe60014 | 4043 | } |
6d3686da DG |
4044 | /* Continuing flushing all buffers */ |
4045 | continue; | |
8be98f9a MD |
4046 | } |
4047 | } | |
8be98f9a | 4048 | |
840cb59c | 4049 | health_code_update(); |
86acf0da | 4050 | |
d88aee68 DG |
4051 | pthread_mutex_unlock(&ua_sess->lock); |
4052 | end_no_session: | |
7db205b5 | 4053 | rcu_read_unlock(); |
840cb59c | 4054 | health_code_update(); |
8be98f9a | 4055 | return 0; |
8be98f9a MD |
4056 | } |
4057 | ||
84cd17c6 MD |
4058 | /* |
4059 | * Destroy a specific UST session in apps. | |
4060 | */ | |
3353de95 | 4061 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 4062 | { |
ffe60014 | 4063 | int ret; |
84cd17c6 | 4064 | struct ust_app_session *ua_sess; |
bec39940 | 4065 | struct lttng_ht_iter iter; |
d9bf3ca4 | 4066 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 4067 | |
852d0037 | 4068 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
4069 | |
4070 | rcu_read_lock(); | |
4071 | ||
e0c7ec2b DG |
4072 | if (!app->compatible) { |
4073 | goto end; | |
4074 | } | |
4075 | ||
84cd17c6 | 4076 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 4077 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 4078 | if (node == NULL) { |
d42f20df DG |
4079 | /* Session is being or is deleted. */ |
4080 | goto end; | |
84cd17c6 MD |
4081 | } |
4082 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 4083 | |
840cb59c | 4084 | health_code_update(); |
d0b96690 | 4085 | destroy_app_session(app, ua_sess); |
84cd17c6 | 4086 | |
840cb59c | 4087 | health_code_update(); |
7db205b5 | 4088 | |
84cd17c6 | 4089 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
4090 | ret = ustctl_wait_quiescent(app->sock); |
4091 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4092 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4093 | app->pid, ret); | |
4094 | } | |
e0c7ec2b DG |
4095 | end: |
4096 | rcu_read_unlock(); | |
840cb59c | 4097 | health_code_update(); |
84cd17c6 | 4098 | return 0; |
84cd17c6 MD |
4099 | } |
4100 | ||
5b4a0ec0 DG |
4101 | /* |
4102 | * Start tracing for the UST session. | |
4103 | */ | |
421cb601 DG |
4104 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
4105 | { | |
4106 | int ret = 0; | |
bec39940 | 4107 | struct lttng_ht_iter iter; |
421cb601 | 4108 | struct ust_app *app; |
48842b30 | 4109 | |
421cb601 DG |
4110 | DBG("Starting all UST traces"); |
4111 | ||
4112 | rcu_read_lock(); | |
421cb601 | 4113 | |
852d0037 | 4114 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
421cb601 | 4115 | ret = ust_app_start_trace(usess, app); |
48842b30 | 4116 | if (ret < 0) { |
5b4a0ec0 DG |
4117 | /* Continue to next apps even on error */ |
4118 | continue; | |
48842b30 | 4119 | } |
48842b30 | 4120 | } |
5b4a0ec0 | 4121 | |
48842b30 DG |
4122 | rcu_read_unlock(); |
4123 | ||
4124 | return 0; | |
4125 | } | |
487cf67c | 4126 | |
8be98f9a MD |
4127 | /* |
4128 | * Start tracing for the UST session. | |
4129 | */ | |
4130 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
4131 | { | |
4132 | int ret = 0; | |
bec39940 | 4133 | struct lttng_ht_iter iter; |
8be98f9a MD |
4134 | struct ust_app *app; |
4135 | ||
4136 | DBG("Stopping all UST traces"); | |
4137 | ||
4138 | rcu_read_lock(); | |
4139 | ||
b34cbebf MD |
4140 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4141 | ret = ust_app_stop_trace(usess, app); | |
4142 | if (ret < 0) { | |
4143 | /* Continue to next apps even on error */ | |
4144 | continue; | |
4145 | } | |
4146 | } | |
4147 | ||
b0a5f0fb | 4148 | /* Flush buffers and push metadata (for UID buffers). */ |
b34cbebf MD |
4149 | switch (usess->buffer_type) { |
4150 | case LTTNG_BUFFER_PER_UID: | |
4151 | { | |
7972aab2 | 4152 | struct buffer_reg_uid *reg; |
b34cbebf MD |
4153 | |
4154 | /* Flush all per UID buffers associated to that session. */ | |
7972aab2 | 4155 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
b0a5f0fb | 4156 | struct ust_registry_session *ust_session_reg; |
7972aab2 DG |
4157 | struct buffer_reg_channel *reg_chan; |
4158 | struct consumer_socket *socket; | |
4159 | ||
4160 | /* Get consumer socket to use to push the metadata.*/ | |
4161 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
4162 | usess->consumer); | |
4163 | if (!socket) { | |
4164 | /* Ignore request if no consumer is found for the session. */ | |
4165 | continue; | |
4166 | } | |
4167 | ||
4168 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
4169 | reg_chan, node.node) { | |
4170 | /* | |
4171 | * The following call will print error values so the return | |
4172 | * code is of little importance because whatever happens, we | |
4173 | * have to try them all. | |
4174 | */ | |
4175 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
4176 | } | |
b0a5f0fb MD |
4177 | |
4178 | ust_session_reg = reg->registry->reg.ust; | |
4179 | if (!ust_session_reg->metadata_closed) { | |
4180 | /* Push metadata. */ | |
4181 | (void) push_metadata(ust_session_reg, usess->consumer); | |
4182 | } | |
7972aab2 | 4183 | } |
b0a5f0fb | 4184 | |
b34cbebf | 4185 | break; |
7972aab2 | 4186 | } |
b34cbebf MD |
4187 | case LTTNG_BUFFER_PER_PID: |
4188 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4189 | ret = ust_app_flush_trace(usess, app); | |
4190 | if (ret < 0) { | |
4191 | /* Continue to next apps even on error */ | |
4192 | continue; | |
4193 | } | |
8be98f9a | 4194 | } |
b34cbebf MD |
4195 | break; |
4196 | default: | |
4197 | assert(0); | |
4198 | break; | |
8be98f9a MD |
4199 | } |
4200 | ||
4201 | rcu_read_unlock(); | |
4202 | ||
4203 | return 0; | |
4204 | } | |
4205 | ||
84cd17c6 MD |
4206 | /* |
4207 | * Destroy app UST session. | |
4208 | */ | |
4209 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
4210 | { | |
4211 | int ret = 0; | |
bec39940 | 4212 | struct lttng_ht_iter iter; |
84cd17c6 MD |
4213 | struct ust_app *app; |
4214 | ||
4215 | DBG("Destroy all UST traces"); | |
4216 | ||
4217 | rcu_read_lock(); | |
4218 | ||
852d0037 | 4219 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 4220 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
4221 | if (ret < 0) { |
4222 | /* Continue to next apps even on error */ | |
4223 | continue; | |
4224 | } | |
4225 | } | |
4226 | ||
4227 | rcu_read_unlock(); | |
4228 | ||
4229 | return 0; | |
4230 | } | |
4231 | ||
5b4a0ec0 DG |
4232 | /* |
4233 | * Add channels/events from UST global domain to registered apps at sock. | |
4234 | */ | |
487cf67c DG |
4235 | void ust_app_global_update(struct ltt_ust_session *usess, int sock) |
4236 | { | |
55c54cce | 4237 | int ret = 0; |
31746f93 | 4238 | struct lttng_ht_iter iter, uiter; |
487cf67c | 4239 | struct ust_app *app; |
3d8ca23b | 4240 | struct ust_app_session *ua_sess = NULL; |
487cf67c DG |
4241 | struct ust_app_channel *ua_chan; |
4242 | struct ust_app_event *ua_event; | |
727d5404 | 4243 | struct ust_app_ctx *ua_ctx; |
1f3580c7 | 4244 | |
95e047ff | 4245 | assert(usess); |
ffe60014 | 4246 | assert(sock >= 0); |
1f3580c7 | 4247 | |
d9bf3ca4 | 4248 | DBG2("UST app global update for app sock %d for session id %" PRIu64, sock, |
a991f516 | 4249 | usess->id); |
487cf67c | 4250 | |
284d8f55 DG |
4251 | rcu_read_lock(); |
4252 | ||
f20baf8e | 4253 | app = ust_app_find_by_sock(sock); |
487cf67c | 4254 | if (app == NULL) { |
d88aee68 DG |
4255 | /* |
4256 | * Application can be unregistered before so this is possible hence | |
4257 | * simply stopping the update. | |
4258 | */ | |
4259 | DBG3("UST app update failed to find app sock %d", sock); | |
487cf67c DG |
4260 | goto error; |
4261 | } | |
4262 | ||
e0c7ec2b DG |
4263 | if (!app->compatible) { |
4264 | goto error; | |
4265 | } | |
4266 | ||
3d8ca23b DG |
4267 | ret = create_ust_app_session(usess, app, &ua_sess, NULL); |
4268 | if (ret < 0) { | |
4269 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
4270 | goto error; |
4271 | } | |
3d8ca23b | 4272 | assert(ua_sess); |
487cf67c | 4273 | |
d0b96690 DG |
4274 | pthread_mutex_lock(&ua_sess->lock); |
4275 | ||
284d8f55 | 4276 | /* |
d0b96690 | 4277 | * We can iterate safely here over all UST app session since the create ust |
284d8f55 DG |
4278 | * app session above made a shadow copy of the UST global domain from the |
4279 | * ltt ust session. | |
4280 | */ | |
bec39940 DG |
4281 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
4282 | node.node) { | |
d65d2de8 DG |
4283 | /* |
4284 | * For a metadata channel, handle it differently. | |
4285 | */ | |
4286 | if (!strncmp(ua_chan->name, DEFAULT_METADATA_NAME, | |
4287 | sizeof(ua_chan->name))) { | |
4288 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, | |
4289 | &ua_chan->attr); | |
c7a339aa DG |
4290 | if (ret < 0) { |
4291 | goto error_unlock; | |
4292 | } | |
d65d2de8 DG |
4293 | /* Remove it from the hash table and continue!. */ |
4294 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
4295 | assert(!ret); | |
4296 | delete_ust_app_channel(-1, ua_chan, app); | |
4297 | continue; | |
4298 | } else { | |
4299 | ret = do_create_channel(app, usess, ua_sess, ua_chan); | |
c7a339aa DG |
4300 | if (ret < 0) { |
4301 | /* | |
4302 | * Stop everything. On error, the application failed, no more | |
4303 | * file descriptor are available or ENOMEM so stopping here is | |
4304 | * the only thing we can do for now. | |
4305 | */ | |
4306 | goto error_unlock; | |
4307 | } | |
487cf67c DG |
4308 | } |
4309 | ||
31746f93 DG |
4310 | /* |
4311 | * Add context using the list so they are enabled in the same order the | |
4312 | * user added them. | |
4313 | */ | |
4314 | cds_list_for_each_entry(ua_ctx, &ua_chan->ctx_list, list) { | |
727d5404 DG |
4315 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); |
4316 | if (ret < 0) { | |
d0b96690 | 4317 | goto error_unlock; |
727d5404 DG |
4318 | } |
4319 | } | |
4320 | ||
4321 | ||
284d8f55 | 4322 | /* For each events */ |
bec39940 DG |
4323 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
4324 | node.node) { | |
284d8f55 DG |
4325 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
4326 | if (ret < 0) { | |
d0b96690 | 4327 | goto error_unlock; |
487cf67c | 4328 | } |
36dc12cc | 4329 | } |
487cf67c DG |
4330 | } |
4331 | ||
d0b96690 DG |
4332 | pthread_mutex_unlock(&ua_sess->lock); |
4333 | ||
36dc12cc | 4334 | if (usess->start_trace) { |
421cb601 | 4335 | ret = ust_app_start_trace(usess, app); |
36dc12cc | 4336 | if (ret < 0) { |
36dc12cc DG |
4337 | goto error; |
4338 | } | |
4339 | ||
852d0037 | 4340 | DBG2("UST trace started for app pid %d", app->pid); |
36dc12cc DG |
4341 | } |
4342 | ||
ffe60014 DG |
4343 | /* Everything went well at this point. */ |
4344 | rcu_read_unlock(); | |
4345 | return; | |
4346 | ||
d0b96690 DG |
4347 | error_unlock: |
4348 | pthread_mutex_unlock(&ua_sess->lock); | |
487cf67c | 4349 | error: |
ffe60014 | 4350 | if (ua_sess) { |
d0b96690 | 4351 | destroy_app_session(app, ua_sess); |
ffe60014 | 4352 | } |
487cf67c DG |
4353 | rcu_read_unlock(); |
4354 | return; | |
4355 | } | |
55cc08a6 DG |
4356 | |
4357 | /* | |
4358 | * Add context to a specific channel for global UST domain. | |
4359 | */ | |
4360 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
4361 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
4362 | { | |
4363 | int ret = 0; | |
bec39940 DG |
4364 | struct lttng_ht_node_str *ua_chan_node; |
4365 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
4366 | struct ust_app_channel *ua_chan = NULL; |
4367 | struct ust_app_session *ua_sess; | |
4368 | struct ust_app *app; | |
4369 | ||
4370 | rcu_read_lock(); | |
4371 | ||
852d0037 | 4372 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4373 | if (!app->compatible) { |
4374 | /* | |
4375 | * TODO: In time, we should notice the caller of this error by | |
4376 | * telling him that this is a version error. | |
4377 | */ | |
4378 | continue; | |
4379 | } | |
55cc08a6 DG |
4380 | ua_sess = lookup_session_by_app(usess, app); |
4381 | if (ua_sess == NULL) { | |
4382 | continue; | |
4383 | } | |
4384 | ||
d0b96690 | 4385 | pthread_mutex_lock(&ua_sess->lock); |
55cc08a6 | 4386 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4387 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4388 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 4389 | if (ua_chan_node == NULL) { |
d0b96690 | 4390 | goto next_app; |
55cc08a6 DG |
4391 | } |
4392 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
4393 | node); | |
55cc08a6 DG |
4394 | ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app); |
4395 | if (ret < 0) { | |
d0b96690 | 4396 | goto next_app; |
55cc08a6 | 4397 | } |
d0b96690 DG |
4398 | next_app: |
4399 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
4400 | } |
4401 | ||
55cc08a6 DG |
4402 | rcu_read_unlock(); |
4403 | return ret; | |
4404 | } | |
4405 | ||
76d45b40 DG |
4406 | /* |
4407 | * Enable event for a channel from a UST session for a specific PID. | |
4408 | */ | |
4409 | int ust_app_enable_event_pid(struct ltt_ust_session *usess, | |
4410 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4411 | { | |
4412 | int ret = 0; | |
bec39940 | 4413 | struct lttng_ht_iter iter; |
18eace3b | 4414 | struct lttng_ht_node_str *ua_chan_node; |
76d45b40 DG |
4415 | struct ust_app *app; |
4416 | struct ust_app_session *ua_sess; | |
4417 | struct ust_app_channel *ua_chan; | |
4418 | struct ust_app_event *ua_event; | |
4419 | ||
4420 | DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid); | |
4421 | ||
4422 | rcu_read_lock(); | |
4423 | ||
4424 | app = ust_app_find_by_pid(pid); | |
4425 | if (app == NULL) { | |
4426 | ERR("UST app enable event per PID %d not found", pid); | |
4427 | ret = -1; | |
d0b96690 | 4428 | goto end; |
76d45b40 DG |
4429 | } |
4430 | ||
e0c7ec2b DG |
4431 | if (!app->compatible) { |
4432 | ret = 0; | |
d0b96690 | 4433 | goto end; |
e0c7ec2b DG |
4434 | } |
4435 | ||
76d45b40 | 4436 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4437 | if (!ua_sess) { |
4438 | /* The application has problem or is probably dead. */ | |
d0b96690 DG |
4439 | ret = 0; |
4440 | goto end; | |
c4a1715b | 4441 | } |
76d45b40 | 4442 | |
d0b96690 | 4443 | pthread_mutex_lock(&ua_sess->lock); |
76d45b40 | 4444 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4445 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4446 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
76d45b40 DG |
4447 | /* If the channel is not found, there is a code flow error */ |
4448 | assert(ua_chan_node); | |
4449 | ||
4450 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4451 | ||
18eace3b | 4452 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 4453 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 4454 | if (ua_event == NULL) { |
76d45b40 DG |
4455 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
4456 | if (ret < 0) { | |
d0b96690 | 4457 | goto end_unlock; |
76d45b40 DG |
4458 | } |
4459 | } else { | |
76d45b40 DG |
4460 | ret = enable_ust_app_event(ua_sess, ua_event, app); |
4461 | if (ret < 0) { | |
d0b96690 | 4462 | goto end_unlock; |
76d45b40 DG |
4463 | } |
4464 | } | |
4465 | ||
d0b96690 DG |
4466 | end_unlock: |
4467 | pthread_mutex_unlock(&ua_sess->lock); | |
4468 | end: | |
76d45b40 DG |
4469 | rcu_read_unlock(); |
4470 | return ret; | |
4471 | } | |
7f79d3a1 DG |
4472 | |
4473 | /* | |
4474 | * Disable event for a channel from a UST session for a specific PID. | |
4475 | */ | |
4476 | int ust_app_disable_event_pid(struct ltt_ust_session *usess, | |
4477 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4478 | { | |
4479 | int ret = 0; | |
bec39940 DG |
4480 | struct lttng_ht_iter iter; |
4481 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
7f79d3a1 DG |
4482 | struct ust_app *app; |
4483 | struct ust_app_session *ua_sess; | |
4484 | struct ust_app_channel *ua_chan; | |
4485 | struct ust_app_event *ua_event; | |
4486 | ||
4487 | DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid); | |
4488 | ||
4489 | rcu_read_lock(); | |
4490 | ||
4491 | app = ust_app_find_by_pid(pid); | |
4492 | if (app == NULL) { | |
4493 | ERR("UST app disable event per PID %d not found", pid); | |
4494 | ret = -1; | |
4495 | goto error; | |
4496 | } | |
4497 | ||
e0c7ec2b DG |
4498 | if (!app->compatible) { |
4499 | ret = 0; | |
4500 | goto error; | |
4501 | } | |
4502 | ||
7f79d3a1 | 4503 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4504 | if (!ua_sess) { |
4505 | /* The application has problem or is probably dead. */ | |
4506 | goto error; | |
4507 | } | |
7f79d3a1 DG |
4508 | |
4509 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
4510 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4511 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
7f79d3a1 DG |
4512 | if (ua_chan_node == NULL) { |
4513 | /* Channel does not exist, skip disabling */ | |
4514 | goto error; | |
4515 | } | |
4516 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4517 | ||
bec39940 DG |
4518 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter); |
4519 | ua_event_node = lttng_ht_iter_get_node_str(&iter); | |
7f79d3a1 DG |
4520 | if (ua_event_node == NULL) { |
4521 | /* Event does not exist, skip disabling */ | |
4522 | goto error; | |
4523 | } | |
4524 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
4525 | ||
4526 | ret = disable_ust_app_event(ua_sess, ua_event, app); | |
4527 | if (ret < 0) { | |
4528 | goto error; | |
4529 | } | |
4530 | ||
4531 | error: | |
4532 | rcu_read_unlock(); | |
4533 | return ret; | |
4534 | } | |
e0c7ec2b | 4535 | |
4466912f DG |
4536 | /* |
4537 | * Calibrate registered applications. | |
4538 | */ | |
4539 | int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate) | |
4540 | { | |
4541 | int ret = 0; | |
4542 | struct lttng_ht_iter iter; | |
4543 | struct ust_app *app; | |
4544 | ||
4545 | rcu_read_lock(); | |
4546 | ||
852d0037 | 4547 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4466912f DG |
4548 | if (!app->compatible) { |
4549 | /* | |
4550 | * TODO: In time, we should notice the caller of this error by | |
4551 | * telling him that this is a version error. | |
4552 | */ | |
4553 | continue; | |
4554 | } | |
4555 | ||
840cb59c | 4556 | health_code_update(); |
86acf0da | 4557 | |
852d0037 | 4558 | ret = ustctl_calibrate(app->sock, calibrate); |
4466912f DG |
4559 | if (ret < 0) { |
4560 | switch (ret) { | |
4561 | case -ENOSYS: | |
4562 | /* Means that it's not implemented on the tracer side. */ | |
4563 | ret = 0; | |
4564 | break; | |
4565 | default: | |
4466912f | 4566 | DBG2("Calibrate app PID %d returned with error %d", |
852d0037 | 4567 | app->pid, ret); |
4466912f DG |
4568 | break; |
4569 | } | |
4570 | } | |
4571 | } | |
4572 | ||
4573 | DBG("UST app global domain calibration finished"); | |
4574 | ||
4575 | rcu_read_unlock(); | |
4576 | ||
840cb59c | 4577 | health_code_update(); |
86acf0da | 4578 | |
4466912f DG |
4579 | return ret; |
4580 | } | |
d0b96690 DG |
4581 | |
4582 | /* | |
4583 | * Receive registration and populate the given msg structure. | |
4584 | * | |
4585 | * On success return 0 else a negative value returned by the ustctl call. | |
4586 | */ | |
4587 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
4588 | { | |
4589 | int ret; | |
4590 | uint32_t pid, ppid, uid, gid; | |
4591 | ||
4592 | assert(msg); | |
4593 | ||
4594 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
4595 | &pid, &ppid, &uid, &gid, | |
4596 | &msg->bits_per_long, | |
4597 | &msg->uint8_t_alignment, | |
4598 | &msg->uint16_t_alignment, | |
4599 | &msg->uint32_t_alignment, | |
4600 | &msg->uint64_t_alignment, | |
4601 | &msg->long_alignment, | |
4602 | &msg->byte_order, | |
4603 | msg->name); | |
4604 | if (ret < 0) { | |
4605 | switch (-ret) { | |
4606 | case EPIPE: | |
4607 | case ECONNRESET: | |
4608 | case LTTNG_UST_ERR_EXITING: | |
4609 | DBG3("UST app recv reg message failed. Application died"); | |
4610 | break; | |
4611 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
4612 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
4613 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
4614 | LTTNG_UST_ABI_MINOR_VERSION); | |
4615 | break; | |
4616 | default: | |
4617 | ERR("UST app recv reg message failed with ret %d", ret); | |
4618 | break; | |
4619 | } | |
4620 | goto error; | |
4621 | } | |
4622 | msg->pid = (pid_t) pid; | |
4623 | msg->ppid = (pid_t) ppid; | |
4624 | msg->uid = (uid_t) uid; | |
4625 | msg->gid = (gid_t) gid; | |
4626 | ||
4627 | error: | |
4628 | return ret; | |
4629 | } | |
4630 | ||
d88aee68 DG |
4631 | /* |
4632 | * Return a ust app channel object using the application object and the channel | |
4633 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
4634 | * lock MUST be acquired before calling this function. | |
4635 | */ | |
d0b96690 DG |
4636 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
4637 | int objd) | |
4638 | { | |
4639 | struct lttng_ht_node_ulong *node; | |
4640 | struct lttng_ht_iter iter; | |
4641 | struct ust_app_channel *ua_chan = NULL; | |
4642 | ||
4643 | assert(app); | |
4644 | ||
4645 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
4646 | node = lttng_ht_iter_get_node_ulong(&iter); | |
4647 | if (node == NULL) { | |
4648 | DBG2("UST app channel find by objd %d not found", objd); | |
4649 | goto error; | |
4650 | } | |
4651 | ||
4652 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
4653 | ||
4654 | error: | |
4655 | return ua_chan; | |
4656 | } | |
4657 | ||
d88aee68 DG |
4658 | /* |
4659 | * Reply to a register channel notification from an application on the notify | |
4660 | * socket. The channel metadata is also created. | |
4661 | * | |
4662 | * The session UST registry lock is acquired in this function. | |
4663 | * | |
4664 | * On success 0 is returned else a negative value. | |
4665 | */ | |
d0b96690 DG |
4666 | static int reply_ust_register_channel(int sock, int sobjd, int cobjd, |
4667 | size_t nr_fields, struct ustctl_field *fields) | |
4668 | { | |
4669 | int ret, ret_code = 0; | |
4670 | uint32_t chan_id, reg_count; | |
7972aab2 | 4671 | uint64_t chan_reg_key; |
d0b96690 DG |
4672 | enum ustctl_channel_header type; |
4673 | struct ust_app *app; | |
4674 | struct ust_app_channel *ua_chan; | |
4675 | struct ust_app_session *ua_sess; | |
7972aab2 | 4676 | struct ust_registry_session *registry; |
45893984 | 4677 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
4678 | |
4679 | rcu_read_lock(); | |
4680 | ||
4681 | /* Lookup application. If not found, there is a code flow error. */ | |
4682 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4683 | if (!app) { |
4684 | DBG("Application socket %d is being teardown. Abort event notify", | |
4685 | sock); | |
4686 | ret = 0; | |
d5d629b5 | 4687 | free(fields); |
d88aee68 DG |
4688 | goto error_rcu_unlock; |
4689 | } | |
d0b96690 | 4690 | |
4950b860 | 4691 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4692 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4693 | if (!ua_chan) { |
4694 | DBG("Application channel is being teardown. Abort event notify"); | |
4695 | ret = 0; | |
d5d629b5 | 4696 | free(fields); |
4950b860 MD |
4697 | goto error_rcu_unlock; |
4698 | } | |
4699 | ||
d0b96690 DG |
4700 | assert(ua_chan->session); |
4701 | ua_sess = ua_chan->session; | |
d0b96690 | 4702 | |
7972aab2 DG |
4703 | /* Get right session registry depending on the session buffer type. */ |
4704 | registry = get_session_registry(ua_sess); | |
4705 | assert(registry); | |
45893984 | 4706 | |
7972aab2 DG |
4707 | /* Depending on the buffer type, a different channel key is used. */ |
4708 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4709 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 4710 | } else { |
7972aab2 | 4711 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
4712 | } |
4713 | ||
7972aab2 DG |
4714 | pthread_mutex_lock(®istry->lock); |
4715 | ||
4716 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
4717 | assert(chan_reg); | |
4718 | ||
4719 | if (!chan_reg->register_done) { | |
4720 | reg_count = ust_registry_get_event_count(chan_reg); | |
4721 | if (reg_count < 31) { | |
4722 | type = USTCTL_CHANNEL_HEADER_COMPACT; | |
4723 | } else { | |
4724 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
4725 | } | |
4726 | ||
4727 | chan_reg->nr_ctx_fields = nr_fields; | |
4728 | chan_reg->ctx_fields = fields; | |
4729 | chan_reg->header_type = type; | |
d0b96690 | 4730 | } else { |
7972aab2 DG |
4731 | /* Get current already assigned values. */ |
4732 | type = chan_reg->header_type; | |
d5d629b5 DG |
4733 | free(fields); |
4734 | /* Set to NULL so the error path does not do a double free. */ | |
4735 | fields = NULL; | |
d0b96690 | 4736 | } |
7972aab2 DG |
4737 | /* Channel id is set during the object creation. */ |
4738 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
4739 | |
4740 | /* Append to metadata */ | |
7972aab2 DG |
4741 | if (!chan_reg->metadata_dumped) { |
4742 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
4743 | if (ret_code) { |
4744 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
4745 | goto reply; | |
4746 | } | |
4747 | } | |
4748 | ||
4749 | reply: | |
7972aab2 DG |
4750 | DBG3("UST app replying to register channel key %" PRIu64 |
4751 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
4752 | ret_code); | |
d0b96690 DG |
4753 | |
4754 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
4755 | if (ret < 0) { | |
4756 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4757 | ERR("UST app reply channel failed with ret %d", ret); | |
4758 | } else { | |
4759 | DBG3("UST app reply channel failed. Application died"); | |
4760 | } | |
4761 | goto error; | |
4762 | } | |
4763 | ||
7972aab2 DG |
4764 | /* This channel registry registration is completed. */ |
4765 | chan_reg->register_done = 1; | |
4766 | ||
d0b96690 | 4767 | error: |
7972aab2 | 4768 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4769 | error_rcu_unlock: |
d0b96690 | 4770 | rcu_read_unlock(); |
d5d629b5 DG |
4771 | if (ret) { |
4772 | free(fields); | |
4773 | } | |
d0b96690 DG |
4774 | return ret; |
4775 | } | |
4776 | ||
d88aee68 DG |
4777 | /* |
4778 | * Add event to the UST channel registry. When the event is added to the | |
4779 | * registry, the metadata is also created. Once done, this replies to the | |
4780 | * application with the appropriate error code. | |
4781 | * | |
4782 | * The session UST registry lock is acquired in the function. | |
4783 | * | |
4784 | * On success 0 is returned else a negative value. | |
4785 | */ | |
d0b96690 DG |
4786 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
4787 | char *sig, size_t nr_fields, struct ustctl_field *fields, int loglevel, | |
4788 | char *model_emf_uri) | |
4789 | { | |
4790 | int ret, ret_code; | |
4791 | uint32_t event_id = 0; | |
7972aab2 | 4792 | uint64_t chan_reg_key; |
d0b96690 DG |
4793 | struct ust_app *app; |
4794 | struct ust_app_channel *ua_chan; | |
4795 | struct ust_app_session *ua_sess; | |
7972aab2 | 4796 | struct ust_registry_session *registry; |
d0b96690 DG |
4797 | |
4798 | rcu_read_lock(); | |
4799 | ||
4800 | /* Lookup application. If not found, there is a code flow error. */ | |
4801 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4802 | if (!app) { |
4803 | DBG("Application socket %d is being teardown. Abort event notify", | |
4804 | sock); | |
4805 | ret = 0; | |
d5d629b5 DG |
4806 | free(sig); |
4807 | free(fields); | |
4808 | free(model_emf_uri); | |
d88aee68 DG |
4809 | goto error_rcu_unlock; |
4810 | } | |
d0b96690 | 4811 | |
4950b860 | 4812 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4813 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4814 | if (!ua_chan) { |
4815 | DBG("Application channel is being teardown. Abort event notify"); | |
4816 | ret = 0; | |
d5d629b5 DG |
4817 | free(sig); |
4818 | free(fields); | |
4819 | free(model_emf_uri); | |
4950b860 MD |
4820 | goto error_rcu_unlock; |
4821 | } | |
4822 | ||
d0b96690 DG |
4823 | assert(ua_chan->session); |
4824 | ua_sess = ua_chan->session; | |
4825 | ||
7972aab2 DG |
4826 | registry = get_session_registry(ua_sess); |
4827 | assert(registry); | |
4828 | ||
4829 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4830 | chan_reg_key = ua_chan->tracing_channel_id; | |
4831 | } else { | |
4832 | chan_reg_key = ua_chan->key; | |
4833 | } | |
4834 | ||
4835 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 4836 | |
d5d629b5 DG |
4837 | /* |
4838 | * From this point on, this call acquires the ownership of the sig, fields | |
4839 | * and model_emf_uri meaning any free are done inside it if needed. These | |
4840 | * three variables MUST NOT be read/write after this. | |
4841 | */ | |
7972aab2 | 4842 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
45893984 | 4843 | sobjd, cobjd, name, sig, nr_fields, fields, loglevel, |
8494bda5 MD |
4844 | model_emf_uri, ua_sess->buffer_type, &event_id, |
4845 | app); | |
d0b96690 DG |
4846 | |
4847 | /* | |
4848 | * The return value is returned to ustctl so in case of an error, the | |
4849 | * application can be notified. In case of an error, it's important not to | |
4850 | * return a negative error or else the application will get closed. | |
4851 | */ | |
4852 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
4853 | if (ret < 0) { | |
4854 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4855 | ERR("UST app reply event failed with ret %d", ret); | |
4856 | } else { | |
4857 | DBG3("UST app reply event failed. Application died"); | |
4858 | } | |
4859 | /* | |
4860 | * No need to wipe the create event since the application socket will | |
4861 | * get close on error hence cleaning up everything by itself. | |
4862 | */ | |
4863 | goto error; | |
4864 | } | |
4865 | ||
7972aab2 DG |
4866 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
4867 | name, event_id); | |
d88aee68 | 4868 | |
d0b96690 | 4869 | error: |
7972aab2 | 4870 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4871 | error_rcu_unlock: |
d0b96690 DG |
4872 | rcu_read_unlock(); |
4873 | return ret; | |
4874 | } | |
4875 | ||
d88aee68 DG |
4876 | /* |
4877 | * Handle application notification through the given notify socket. | |
4878 | * | |
4879 | * Return 0 on success or else a negative value. | |
4880 | */ | |
d0b96690 DG |
4881 | int ust_app_recv_notify(int sock) |
4882 | { | |
4883 | int ret; | |
4884 | enum ustctl_notify_cmd cmd; | |
4885 | ||
4886 | DBG3("UST app receiving notify from sock %d", sock); | |
4887 | ||
4888 | ret = ustctl_recv_notify(sock, &cmd); | |
4889 | if (ret < 0) { | |
4890 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4891 | ERR("UST app recv notify failed with ret %d", ret); | |
4892 | } else { | |
4893 | DBG3("UST app recv notify failed. Application died"); | |
4894 | } | |
4895 | goto error; | |
4896 | } | |
4897 | ||
4898 | switch (cmd) { | |
4899 | case USTCTL_NOTIFY_CMD_EVENT: | |
4900 | { | |
4901 | int sobjd, cobjd, loglevel; | |
4902 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; | |
4903 | size_t nr_fields; | |
4904 | struct ustctl_field *fields; | |
4905 | ||
4906 | DBG2("UST app ustctl register event received"); | |
4907 | ||
4908 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, &loglevel, | |
4909 | &sig, &nr_fields, &fields, &model_emf_uri); | |
4910 | if (ret < 0) { | |
4911 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4912 | ERR("UST app recv event failed with ret %d", ret); | |
4913 | } else { | |
4914 | DBG3("UST app recv event failed. Application died"); | |
4915 | } | |
4916 | goto error; | |
4917 | } | |
4918 | ||
d5d629b5 DG |
4919 | /* |
4920 | * Add event to the UST registry coming from the notify socket. This | |
4921 | * call will free if needed the sig, fields and model_emf_uri. This | |
4922 | * code path loses the ownsership of these variables and transfer them | |
4923 | * to the this function. | |
4924 | */ | |
d0b96690 DG |
4925 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
4926 | fields, loglevel, model_emf_uri); | |
4927 | if (ret < 0) { | |
4928 | goto error; | |
4929 | } | |
4930 | ||
4931 | break; | |
4932 | } | |
4933 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
4934 | { | |
4935 | int sobjd, cobjd; | |
4936 | size_t nr_fields; | |
4937 | struct ustctl_field *fields; | |
4938 | ||
4939 | DBG2("UST app ustctl register channel received"); | |
4940 | ||
4941 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
4942 | &fields); | |
4943 | if (ret < 0) { | |
4944 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4945 | ERR("UST app recv channel failed with ret %d", ret); | |
4946 | } else { | |
4947 | DBG3("UST app recv channel failed. Application died"); | |
4948 | } | |
4949 | goto error; | |
4950 | } | |
4951 | ||
d5d629b5 DG |
4952 | /* |
4953 | * The fields ownership are transfered to this function call meaning | |
4954 | * that if needed it will be freed. After this, it's invalid to access | |
4955 | * fields or clean it up. | |
4956 | */ | |
d0b96690 DG |
4957 | ret = reply_ust_register_channel(sock, sobjd, cobjd, nr_fields, |
4958 | fields); | |
4959 | if (ret < 0) { | |
4960 | goto error; | |
4961 | } | |
4962 | ||
4963 | break; | |
4964 | } | |
4965 | default: | |
4966 | /* Should NEVER happen. */ | |
4967 | assert(0); | |
4968 | } | |
4969 | ||
4970 | error: | |
4971 | return ret; | |
4972 | } | |
d88aee68 DG |
4973 | |
4974 | /* | |
4975 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
4976 | * corresponding application. On failure, the call_rcu to close the socket is | |
4977 | * executed. If an application is found, it tries to delete it from the notify | |
4978 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
4979 | * | |
4980 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
4981 | * call RCU is not done but the rest of the cleanup is. | |
4982 | */ | |
4983 | void ust_app_notify_sock_unregister(int sock) | |
4984 | { | |
4985 | int err_enomem = 0; | |
4986 | struct lttng_ht_iter iter; | |
4987 | struct ust_app *app; | |
4988 | struct ust_app_notify_sock_obj *obj; | |
4989 | ||
4990 | assert(sock >= 0); | |
4991 | ||
4992 | rcu_read_lock(); | |
4993 | ||
4994 | obj = zmalloc(sizeof(*obj)); | |
4995 | if (!obj) { | |
4996 | /* | |
4997 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
4998 | * procedure but the call_rcu will not be called. In this case, we | |
4999 | * accept the fd leak rather than possibly creating an unsynchronized | |
5000 | * state between threads. | |
5001 | * | |
5002 | * TODO: The notify object should be created once the notify socket is | |
5003 | * registered and stored independantely from the ust app object. The | |
5004 | * tricky part is to synchronize the teardown of the application and | |
5005 | * this notify object. Let's keep that in mind so we can avoid this | |
5006 | * kind of shenanigans with ENOMEM in the teardown path. | |
5007 | */ | |
5008 | err_enomem = 1; | |
5009 | } else { | |
5010 | obj->fd = sock; | |
5011 | } | |
5012 | ||
5013 | DBG("UST app notify socket unregister %d", sock); | |
5014 | ||
5015 | /* | |
5016 | * Lookup application by notify socket. If this fails, this means that the | |
5017 | * hash table delete has already been done by the application | |
5018 | * unregistration process so we can safely close the notify socket in a | |
5019 | * call RCU. | |
5020 | */ | |
5021 | app = find_app_by_notify_sock(sock); | |
5022 | if (!app) { | |
5023 | goto close_socket; | |
5024 | } | |
5025 | ||
5026 | iter.iter.node = &app->notify_sock_n.node; | |
5027 | ||
5028 | /* | |
5029 | * Whatever happens here either we fail or succeed, in both cases we have | |
5030 | * to close the socket after a grace period to continue to the call RCU | |
5031 | * here. If the deletion is successful, the application is not visible | |
5032 | * anymore by other threads and is it fails it means that it was already | |
5033 | * deleted from the hash table so either way we just have to close the | |
5034 | * socket. | |
5035 | */ | |
5036 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
5037 | ||
5038 | close_socket: | |
5039 | rcu_read_unlock(); | |
5040 | ||
5041 | /* | |
5042 | * Close socket after a grace period to avoid for the socket to be reused | |
5043 | * before the application object is freed creating potential race between | |
5044 | * threads trying to add unique in the global hash table. | |
5045 | */ | |
5046 | if (!err_enomem) { | |
5047 | call_rcu(&obj->head, close_notify_sock_rcu); | |
5048 | } | |
5049 | } | |
f45e313d DG |
5050 | |
5051 | /* | |
5052 | * Destroy a ust app data structure and free its memory. | |
5053 | */ | |
5054 | void ust_app_destroy(struct ust_app *app) | |
5055 | { | |
5056 | if (!app) { | |
5057 | return; | |
5058 | } | |
5059 | ||
5060 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
5061 | } | |
6dc3064a DG |
5062 | |
5063 | /* | |
5064 | * Take a snapshot for a given UST session. The snapshot is sent to the given | |
5065 | * output. | |
5066 | * | |
5067 | * Return 0 on success or else a negative value. | |
5068 | */ | |
5069 | int ust_app_snapshot_record(struct ltt_ust_session *usess, | |
5c786ded | 5070 | struct snapshot_output *output, int wait, unsigned int nb_streams) |
6dc3064a DG |
5071 | { |
5072 | int ret = 0; | |
5073 | struct lttng_ht_iter iter; | |
5074 | struct ust_app *app; | |
af706bb7 | 5075 | char pathname[PATH_MAX]; |
5c786ded | 5076 | uint64_t max_stream_size = 0; |
6dc3064a DG |
5077 | |
5078 | assert(usess); | |
5079 | assert(output); | |
5080 | ||
5081 | rcu_read_lock(); | |
5082 | ||
5c786ded JD |
5083 | /* |
5084 | * Compute the maximum size of a single stream if a max size is asked by | |
5085 | * the caller. | |
5086 | */ | |
5087 | if (output->max_size > 0 && nb_streams > 0) { | |
5088 | max_stream_size = output->max_size / nb_streams; | |
5089 | } | |
5090 | ||
8c924c7b MD |
5091 | switch (usess->buffer_type) { |
5092 | case LTTNG_BUFFER_PER_UID: | |
5093 | { | |
5094 | struct buffer_reg_uid *reg; | |
6dc3064a | 5095 | |
8c924c7b MD |
5096 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
5097 | struct buffer_reg_channel *reg_chan; | |
5098 | struct consumer_socket *socket; | |
6dc3064a | 5099 | |
8c924c7b MD |
5100 | /* Get consumer socket to use to push the metadata.*/ |
5101 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
5102 | usess->consumer); | |
5103 | if (!socket) { | |
5104 | ret = -EINVAL; | |
5105 | goto error; | |
5106 | } | |
6dc3064a | 5107 | |
8c924c7b MD |
5108 | memset(pathname, 0, sizeof(pathname)); |
5109 | ret = snprintf(pathname, sizeof(pathname), | |
5110 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH, | |
5111 | reg->uid, reg->bits_per_long); | |
5112 | if (ret < 0) { | |
5113 | PERROR("snprintf snapshot path"); | |
5114 | goto error; | |
5115 | } | |
5116 | ||
5117 | /* Add the UST default trace dir to path. */ | |
5118 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
5119 | reg_chan, node.node) { | |
5120 | ||
5121 | /* | |
5122 | * Make sure the maximum stream size is not lower than the | |
5123 | * subbuffer size or else it's an error since we won't be able to | |
5124 | * snapshot anything. | |
5125 | */ | |
5126 | if (max_stream_size && | |
5127 | reg_chan->subbuf_size > max_stream_size) { | |
5128 | ret = -EINVAL; | |
5129 | DBG3("UST app snapshot record maximum stream size %" PRIu64 | |
6a00837f | 5130 | " is smaller than subbuffer size of %zu", |
8c924c7b MD |
5131 | max_stream_size, reg_chan->subbuf_size); |
5132 | goto error; | |
5133 | } | |
5134 | ret = consumer_snapshot_channel(socket, reg_chan->consumer_key, output, 0, | |
5135 | usess->uid, usess->gid, pathname, wait, | |
5136 | max_stream_size); | |
5137 | if (ret < 0) { | |
5138 | goto error; | |
5139 | } | |
5140 | } | |
5141 | ret = consumer_snapshot_channel(socket, reg->registry->reg.ust->metadata_key, output, | |
5142 | 1, usess->uid, usess->gid, pathname, wait, | |
5143 | max_stream_size); | |
5144 | if (ret < 0) { | |
5145 | goto error; | |
5146 | } | |
af706bb7 | 5147 | } |
8c924c7b MD |
5148 | break; |
5149 | } | |
5150 | case LTTNG_BUFFER_PER_PID: | |
5151 | { | |
5152 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5153 | struct consumer_socket *socket; | |
5154 | struct lttng_ht_iter chan_iter; | |
5155 | struct ust_app_channel *ua_chan; | |
5156 | struct ust_app_session *ua_sess; | |
5157 | struct ust_registry_session *registry; | |
5158 | ||
5159 | ua_sess = lookup_session_by_app(usess, app); | |
5160 | if (!ua_sess) { | |
5161 | /* Session not associated with this app. */ | |
5162 | continue; | |
5163 | } | |
af706bb7 | 5164 | |
8c924c7b MD |
5165 | /* Get the right consumer socket for the application. */ |
5166 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
5167 | output->consumer); | |
5168 | if (!socket) { | |
5c786ded | 5169 | ret = -EINVAL; |
5c786ded JD |
5170 | goto error; |
5171 | } | |
5172 | ||
8c924c7b MD |
5173 | /* Add the UST default trace dir to path. */ |
5174 | memset(pathname, 0, sizeof(pathname)); | |
5175 | ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "/%s", | |
5176 | ua_sess->path); | |
6dc3064a | 5177 | if (ret < 0) { |
8c924c7b | 5178 | PERROR("snprintf snapshot path"); |
6dc3064a DG |
5179 | goto error; |
5180 | } | |
6dc3064a | 5181 | |
8c924c7b MD |
5182 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, |
5183 | ua_chan, node.node) { | |
5184 | /* | |
5185 | * Make sure the maximum stream size is not lower than the | |
5186 | * subbuffer size or else it's an error since we won't be able to | |
5187 | * snapshot anything. | |
5188 | */ | |
5189 | if (max_stream_size && | |
5190 | ua_chan->attr.subbuf_size > max_stream_size) { | |
5191 | ret = -EINVAL; | |
5192 | DBG3("UST app snapshot record maximum stream size %" PRIu64 | |
5193 | " is smaller than subbuffer size of %" PRIu64, | |
5194 | max_stream_size, ua_chan->attr.subbuf_size); | |
5195 | goto error; | |
5196 | } | |
6dc3064a | 5197 | |
8c924c7b MD |
5198 | ret = consumer_snapshot_channel(socket, ua_chan->key, output, 0, |
5199 | ua_sess->euid, ua_sess->egid, pathname, wait, | |
5200 | max_stream_size); | |
5201 | if (ret < 0) { | |
5202 | goto error; | |
5203 | } | |
5204 | } | |
5205 | ||
5206 | registry = get_session_registry(ua_sess); | |
5207 | assert(registry); | |
5208 | ret = consumer_snapshot_channel(socket, registry->metadata_key, output, | |
5209 | 1, ua_sess->euid, ua_sess->egid, pathname, wait, | |
5210 | max_stream_size); | |
5211 | if (ret < 0) { | |
5212 | goto error; | |
5213 | } | |
5214 | } | |
5215 | break; | |
5216 | } | |
5217 | default: | |
5218 | assert(0); | |
5219 | break; | |
6dc3064a DG |
5220 | } |
5221 | ||
5222 | error: | |
5223 | rcu_read_unlock(); | |
5224 | return ret; | |
5225 | } | |
5c786ded JD |
5226 | |
5227 | /* | |
5228 | * Return the number of streams for a UST session. | |
5229 | */ | |
5230 | unsigned int ust_app_get_nb_stream(struct ltt_ust_session *usess) | |
5231 | { | |
5232 | unsigned int ret = 0; | |
5233 | struct ust_app *app; | |
5234 | struct lttng_ht_iter iter; | |
5235 | ||
5236 | assert(usess); | |
5237 | ||
5238 | switch (usess->buffer_type) { | |
5239 | case LTTNG_BUFFER_PER_UID: | |
5240 | { | |
5241 | struct buffer_reg_uid *reg; | |
5242 | ||
5243 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
5244 | struct buffer_reg_channel *reg_chan; | |
5245 | ||
5246 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
5247 | reg_chan, node.node) { | |
5248 | ret += reg_chan->stream_count; | |
5249 | } | |
5250 | } | |
5251 | break; | |
5252 | } | |
5253 | case LTTNG_BUFFER_PER_PID: | |
5254 | { | |
5255 | rcu_read_lock(); | |
5256 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5257 | struct ust_app_channel *ua_chan; | |
5258 | struct ust_app_session *ua_sess; | |
5259 | struct lttng_ht_iter chan_iter; | |
5260 | ||
5261 | ua_sess = lookup_session_by_app(usess, app); | |
5262 | if (!ua_sess) { | |
5263 | /* Session not associated with this app. */ | |
5264 | continue; | |
5265 | } | |
5266 | ||
5267 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
5268 | ua_chan, node.node) { | |
5269 | ret += ua_chan->streams.count; | |
5270 | } | |
5271 | } | |
5272 | rcu_read_unlock(); | |
5273 | break; | |
5274 | } | |
5275 | default: | |
5276 | assert(0); | |
5277 | break; | |
5278 | } | |
5279 | ||
5280 | return ret; | |
5281 | } |