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 | |
123fb9ed MD |
43 | static |
44 | int ust_app_flush_app_session(struct ust_app *app, struct ust_app_session *ua_sess); | |
45 | ||
d9bf3ca4 MD |
46 | /* Next available channel key. Access under next_channel_key_lock. */ |
47 | static uint64_t _next_channel_key; | |
48 | static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER; | |
49 | ||
50 | /* Next available session ID. Access under next_session_id_lock. */ | |
51 | static uint64_t _next_session_id; | |
52 | static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER; | |
ffe60014 DG |
53 | |
54 | /* | |
d9bf3ca4 | 55 | * Return the incremented value of next_channel_key. |
ffe60014 | 56 | */ |
d9bf3ca4 | 57 | static uint64_t get_next_channel_key(void) |
ffe60014 | 58 | { |
d9bf3ca4 MD |
59 | uint64_t ret; |
60 | ||
61 | pthread_mutex_lock(&next_channel_key_lock); | |
62 | ret = ++_next_channel_key; | |
63 | pthread_mutex_unlock(&next_channel_key_lock); | |
64 | return ret; | |
ffe60014 DG |
65 | } |
66 | ||
67 | /* | |
7972aab2 | 68 | * Return the atomically incremented value of next_session_id. |
ffe60014 | 69 | */ |
d9bf3ca4 | 70 | static uint64_t get_next_session_id(void) |
ffe60014 | 71 | { |
d9bf3ca4 MD |
72 | uint64_t ret; |
73 | ||
74 | pthread_mutex_lock(&next_session_id_lock); | |
75 | ret = ++_next_session_id; | |
76 | pthread_mutex_unlock(&next_session_id_lock); | |
77 | return ret; | |
ffe60014 DG |
78 | } |
79 | ||
d65d2de8 DG |
80 | static void copy_channel_attr_to_ustctl( |
81 | struct ustctl_consumer_channel_attr *attr, | |
82 | struct lttng_ust_channel_attr *uattr) | |
83 | { | |
84 | /* Copy event attributes since the layout is different. */ | |
85 | attr->subbuf_size = uattr->subbuf_size; | |
86 | attr->num_subbuf = uattr->num_subbuf; | |
87 | attr->overwrite = uattr->overwrite; | |
88 | attr->switch_timer_interval = uattr->switch_timer_interval; | |
89 | attr->read_timer_interval = uattr->read_timer_interval; | |
90 | attr->output = uattr->output; | |
91 | } | |
92 | ||
025faf73 DG |
93 | /* |
94 | * Match function for the hash table lookup. | |
95 | * | |
96 | * It matches an ust app event based on three attributes which are the event | |
97 | * name, the filter bytecode and the loglevel. | |
98 | */ | |
18eace3b DG |
99 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
100 | { | |
101 | struct ust_app_event *event; | |
102 | const struct ust_app_ht_key *key; | |
103 | ||
104 | assert(node); | |
105 | assert(_key); | |
106 | ||
107 | event = caa_container_of(node, struct ust_app_event, node.node); | |
108 | key = _key; | |
109 | ||
1af53eb5 | 110 | /* Match the 4 elements of the key: name, filter, loglevel, exclusions */ |
18eace3b DG |
111 | |
112 | /* Event name */ | |
113 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
114 | goto no_match; | |
115 | } | |
116 | ||
117 | /* Event loglevel. */ | |
118 | if (event->attr.loglevel != key->loglevel) { | |
025faf73 DG |
119 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
120 | && key->loglevel == 0 && event->attr.loglevel == -1) { | |
121 | /* | |
122 | * Match is accepted. This is because on event creation, the | |
123 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
124 | * -1 are accepted for this loglevel type since 0 is the one set by | |
125 | * the API when receiving an enable event. | |
126 | */ | |
127 | } else { | |
128 | goto no_match; | |
129 | } | |
18eace3b DG |
130 | } |
131 | ||
132 | /* One of the filters is NULL, fail. */ | |
133 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
134 | goto no_match; | |
135 | } | |
136 | ||
025faf73 DG |
137 | if (key->filter && event->filter) { |
138 | /* Both filters exists, check length followed by the bytecode. */ | |
139 | if (event->filter->len != key->filter->len || | |
140 | memcmp(event->filter->data, key->filter->data, | |
141 | event->filter->len) != 0) { | |
142 | goto no_match; | |
143 | } | |
18eace3b DG |
144 | } |
145 | ||
1af53eb5 JI |
146 | /* One of the exclusions is NULL, fail. */ |
147 | if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) { | |
148 | goto no_match; | |
149 | } | |
150 | ||
151 | if (key->exclusion && event->exclusion) { | |
152 | /* Both exclusions exists, check count followed by the names. */ | |
153 | if (event->exclusion->count != key->exclusion->count || | |
154 | memcmp(event->exclusion->names, key->exclusion->names, | |
155 | event->exclusion->count * LTTNG_UST_SYM_NAME_LEN) != 0) { | |
156 | goto no_match; | |
157 | } | |
158 | } | |
159 | ||
160 | ||
025faf73 | 161 | /* Match. */ |
18eace3b DG |
162 | return 1; |
163 | ||
164 | no_match: | |
165 | return 0; | |
18eace3b DG |
166 | } |
167 | ||
025faf73 DG |
168 | /* |
169 | * Unique add of an ust app event in the given ht. This uses the custom | |
170 | * ht_match_ust_app_event match function and the event name as hash. | |
171 | */ | |
d0b96690 | 172 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
173 | struct ust_app_event *event) |
174 | { | |
175 | struct cds_lfht_node *node_ptr; | |
176 | struct ust_app_ht_key key; | |
d0b96690 | 177 | struct lttng_ht *ht; |
18eace3b | 178 | |
d0b96690 DG |
179 | assert(ua_chan); |
180 | assert(ua_chan->events); | |
18eace3b DG |
181 | assert(event); |
182 | ||
d0b96690 | 183 | ht = ua_chan->events; |
18eace3b DG |
184 | key.name = event->attr.name; |
185 | key.filter = event->filter; | |
186 | key.loglevel = event->attr.loglevel; | |
91c89f23 | 187 | key.exclusion = event->exclusion; |
18eace3b DG |
188 | |
189 | node_ptr = cds_lfht_add_unique(ht->ht, | |
190 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
191 | ht_match_ust_app_event, &key, &event->node.node); | |
192 | assert(node_ptr == &event->node.node); | |
193 | } | |
194 | ||
d88aee68 DG |
195 | /* |
196 | * Close the notify socket from the given RCU head object. This MUST be called | |
197 | * through a call_rcu(). | |
198 | */ | |
199 | static void close_notify_sock_rcu(struct rcu_head *head) | |
200 | { | |
201 | int ret; | |
202 | struct ust_app_notify_sock_obj *obj = | |
203 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
204 | ||
205 | /* Must have a valid fd here. */ | |
206 | assert(obj->fd >= 0); | |
207 | ||
208 | ret = close(obj->fd); | |
209 | if (ret) { | |
210 | ERR("close notify sock %d RCU", obj->fd); | |
211 | } | |
212 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
213 | ||
214 | free(obj); | |
215 | } | |
216 | ||
7972aab2 DG |
217 | /* |
218 | * Return the session registry according to the buffer type of the given | |
219 | * session. | |
220 | * | |
221 | * A registry per UID object MUST exists before calling this function or else | |
222 | * it assert() if not found. RCU read side lock must be acquired. | |
223 | */ | |
224 | static struct ust_registry_session *get_session_registry( | |
225 | struct ust_app_session *ua_sess) | |
226 | { | |
227 | struct ust_registry_session *registry = NULL; | |
228 | ||
229 | assert(ua_sess); | |
230 | ||
231 | switch (ua_sess->buffer_type) { | |
232 | case LTTNG_BUFFER_PER_PID: | |
233 | { | |
234 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
235 | if (!reg_pid) { | |
236 | goto error; | |
237 | } | |
238 | registry = reg_pid->registry->reg.ust; | |
239 | break; | |
240 | } | |
241 | case LTTNG_BUFFER_PER_UID: | |
242 | { | |
243 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
244 | ua_sess->tracing_id, ua_sess->bits_per_long, ua_sess->uid); | |
245 | if (!reg_uid) { | |
246 | goto error; | |
247 | } | |
248 | registry = reg_uid->registry->reg.ust; | |
249 | break; | |
250 | } | |
251 | default: | |
252 | assert(0); | |
253 | }; | |
254 | ||
255 | error: | |
256 | return registry; | |
257 | } | |
258 | ||
55cc08a6 DG |
259 | /* |
260 | * Delete ust context safely. RCU read lock must be held before calling | |
261 | * this function. | |
262 | */ | |
263 | static | |
264 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx) | |
265 | { | |
ffe60014 DG |
266 | int ret; |
267 | ||
268 | assert(ua_ctx); | |
269 | ||
55cc08a6 | 270 | if (ua_ctx->obj) { |
ffe60014 | 271 | ret = ustctl_release_object(sock, ua_ctx->obj); |
d0b96690 DG |
272 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
273 | ERR("UST app sock %d release ctx obj handle %d failed with ret %d", | |
274 | sock, ua_ctx->obj->handle, ret); | |
ffe60014 | 275 | } |
55cc08a6 DG |
276 | free(ua_ctx->obj); |
277 | } | |
278 | free(ua_ctx); | |
279 | } | |
280 | ||
d80a6244 DG |
281 | /* |
282 | * Delete ust app event safely. RCU read lock must be held before calling | |
283 | * this function. | |
284 | */ | |
8b366481 DG |
285 | static |
286 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event) | |
d80a6244 | 287 | { |
ffe60014 DG |
288 | int ret; |
289 | ||
290 | assert(ua_event); | |
291 | ||
53a80697 | 292 | free(ua_event->filter); |
951f0b71 JI |
293 | if (ua_event->exclusion != NULL) |
294 | free(ua_event->exclusion); | |
edb67388 | 295 | if (ua_event->obj != NULL) { |
ffe60014 DG |
296 | ret = ustctl_release_object(sock, ua_event->obj); |
297 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
298 | ERR("UST app sock %d release event obj failed with ret %d", | |
299 | sock, ret); | |
300 | } | |
edb67388 DG |
301 | free(ua_event->obj); |
302 | } | |
d80a6244 DG |
303 | free(ua_event); |
304 | } | |
305 | ||
306 | /* | |
7972aab2 DG |
307 | * Release ust data object of the given stream. |
308 | * | |
309 | * Return 0 on success or else a negative value. | |
d80a6244 | 310 | */ |
7972aab2 | 311 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream) |
d80a6244 | 312 | { |
7972aab2 | 313 | int ret = 0; |
ffe60014 DG |
314 | |
315 | assert(stream); | |
316 | ||
8b366481 | 317 | if (stream->obj) { |
ffe60014 DG |
318 | ret = ustctl_release_object(sock, stream->obj); |
319 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
320 | ERR("UST app sock %d release stream obj failed with ret %d", | |
321 | sock, ret); | |
322 | } | |
4063050c | 323 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
324 | free(stream->obj); |
325 | } | |
7972aab2 DG |
326 | |
327 | return ret; | |
328 | } | |
329 | ||
330 | /* | |
331 | * Delete ust app stream safely. RCU read lock must be held before calling | |
332 | * this function. | |
333 | */ | |
334 | static | |
335 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream) | |
336 | { | |
337 | assert(stream); | |
338 | ||
339 | (void) release_ust_app_stream(sock, stream); | |
84cd17c6 | 340 | free(stream); |
d80a6244 DG |
341 | } |
342 | ||
36b588ed MD |
343 | /* |
344 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
345 | * section and outside of call_rcu thread, so we postpone its execution |
346 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
347 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
348 | */ |
349 | static | |
350 | void delete_ust_app_channel_rcu(struct rcu_head *head) | |
351 | { | |
352 | struct ust_app_channel *ua_chan = | |
353 | caa_container_of(head, struct ust_app_channel, rcu_head); | |
354 | ||
0b2dc8df MD |
355 | ht_cleanup_push(ua_chan->ctx); |
356 | ht_cleanup_push(ua_chan->events); | |
36b588ed MD |
357 | free(ua_chan); |
358 | } | |
359 | ||
d80a6244 DG |
360 | /* |
361 | * Delete ust app channel safely. RCU read lock must be held before calling | |
362 | * this function. | |
363 | */ | |
8b366481 | 364 | static |
d0b96690 DG |
365 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
366 | struct ust_app *app) | |
d80a6244 DG |
367 | { |
368 | int ret; | |
bec39940 | 369 | struct lttng_ht_iter iter; |
d80a6244 | 370 | struct ust_app_event *ua_event; |
55cc08a6 | 371 | struct ust_app_ctx *ua_ctx; |
030a66fa | 372 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 373 | struct ust_registry_session *registry; |
d80a6244 | 374 | |
ffe60014 DG |
375 | assert(ua_chan); |
376 | ||
377 | DBG3("UST app deleting channel %s", ua_chan->name); | |
378 | ||
55cc08a6 | 379 | /* Wipe stream */ |
d80a6244 | 380 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 381 | cds_list_del(&stream->list); |
d80a6244 DG |
382 | delete_ust_app_stream(sock, stream); |
383 | } | |
384 | ||
55cc08a6 | 385 | /* Wipe context */ |
bec39940 | 386 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
31746f93 | 387 | cds_list_del(&ua_ctx->list); |
bec39940 | 388 | ret = lttng_ht_del(ua_chan->ctx, &iter); |
55cc08a6 DG |
389 | assert(!ret); |
390 | delete_ust_app_ctx(sock, ua_ctx); | |
391 | } | |
d80a6244 | 392 | |
55cc08a6 | 393 | /* Wipe events */ |
bec39940 DG |
394 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
395 | node.node) { | |
396 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 397 | assert(!ret); |
d80a6244 DG |
398 | delete_ust_app_event(sock, ua_event); |
399 | } | |
edb67388 | 400 | |
c8335706 MD |
401 | if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) { |
402 | /* Wipe and free registry from session registry. */ | |
403 | registry = get_session_registry(ua_chan->session); | |
404 | if (registry) { | |
405 | ust_registry_channel_del_free(registry, ua_chan->key); | |
406 | } | |
7972aab2 | 407 | } |
d0b96690 | 408 | |
edb67388 | 409 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
410 | /* Remove channel from application UST object descriptor. */ |
411 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
c6e62271 DG |
412 | ret = lttng_ht_del(app->ust_objd, &iter); |
413 | assert(!ret); | |
ffe60014 DG |
414 | ret = ustctl_release_object(sock, ua_chan->obj); |
415 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
416 | ERR("UST app sock %d release channel obj failed with ret %d", | |
417 | sock, ret); | |
418 | } | |
7972aab2 | 419 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
420 | free(ua_chan->obj); |
421 | } | |
36b588ed | 422 | call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); |
d80a6244 DG |
423 | } |
424 | ||
331744e3 | 425 | /* |
1b532a60 DG |
426 | * Push metadata to consumer socket. |
427 | * | |
428 | * The socket lock MUST be acquired. | |
429 | * The ust app session lock MUST be acquired. | |
331744e3 JD |
430 | * |
431 | * On success, return the len of metadata pushed or else a negative value. | |
432 | */ | |
433 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
434 | struct consumer_socket *socket, int send_zero_data) | |
435 | { | |
436 | int ret; | |
437 | char *metadata_str = NULL; | |
438 | size_t len, offset; | |
439 | ssize_t ret_val; | |
440 | ||
441 | assert(registry); | |
442 | assert(socket); | |
1b532a60 | 443 | |
008b9675 MD |
444 | pthread_mutex_lock(®istry->lock); |
445 | ||
446 | /* | |
447 | * Means that no metadata was assigned to the session. This can happens if | |
448 | * no start has been done previously. | |
449 | */ | |
450 | if (!registry->metadata_key) { | |
451 | pthread_mutex_unlock(®istry->lock); | |
452 | return 0; | |
453 | } | |
454 | ||
1b532a60 DG |
455 | /* |
456 | * On a push metadata error either the consumer is dead or the metadata | |
457 | * channel has been destroyed because its endpoint might have died (e.g: | |
458 | * relayd). If so, the metadata closed flag is set to 1 so we deny pushing | |
459 | * metadata again which is not valid anymore on the consumer side. | |
1b532a60 DG |
460 | */ |
461 | if (registry->metadata_closed) { | |
008b9675 | 462 | pthread_mutex_unlock(®istry->lock); |
1b532a60 DG |
463 | return -EPIPE; |
464 | } | |
331744e3 | 465 | |
331744e3 JD |
466 | offset = registry->metadata_len_sent; |
467 | len = registry->metadata_len - registry->metadata_len_sent; | |
468 | if (len == 0) { | |
469 | DBG3("No metadata to push for metadata key %" PRIu64, | |
470 | registry->metadata_key); | |
471 | ret_val = len; | |
472 | if (send_zero_data) { | |
473 | DBG("No metadata to push"); | |
474 | goto push_data; | |
475 | } | |
476 | goto end; | |
477 | } | |
478 | ||
479 | /* Allocate only what we have to send. */ | |
480 | metadata_str = zmalloc(len); | |
481 | if (!metadata_str) { | |
482 | PERROR("zmalloc ust app metadata string"); | |
483 | ret_val = -ENOMEM; | |
484 | goto error; | |
485 | } | |
486 | /* Copy what we haven't send out. */ | |
487 | memcpy(metadata_str, registry->metadata + offset, len); | |
488 | registry->metadata_len_sent += len; | |
489 | ||
490 | push_data: | |
491 | pthread_mutex_unlock(®istry->lock); | |
492 | ret = consumer_push_metadata(socket, registry->metadata_key, | |
493 | metadata_str, len, offset); | |
494 | if (ret < 0) { | |
000baf6a DG |
495 | /* |
496 | * There is an acceptable race here between the registry metadata key | |
497 | * assignment and the creation on the consumer. The session daemon can | |
498 | * concurrently push metadata for this registry while being created on | |
499 | * the consumer since the metadata key of the registry is assigned | |
500 | * *before* it is setup to avoid the consumer to ask for metadata that | |
501 | * could possibly be not found in the session daemon. | |
502 | * | |
503 | * The metadata will get pushed either by the session being stopped or | |
504 | * the consumer requesting metadata if that race is triggered. | |
505 | */ | |
506 | if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) { | |
507 | ret = 0; | |
508 | } | |
ffa3f245 DG |
509 | |
510 | /* Update back the actual metadata len sent since it failed here. */ | |
511 | pthread_mutex_lock(®istry->lock); | |
512 | registry->metadata_len_sent -= len; | |
513 | pthread_mutex_unlock(®istry->lock); | |
331744e3 JD |
514 | ret_val = ret; |
515 | goto error_push; | |
516 | } | |
517 | ||
518 | free(metadata_str); | |
519 | return len; | |
520 | ||
521 | end: | |
522 | error: | |
008b9675 MD |
523 | if (ret_val) { |
524 | /* | |
525 | * On error, flag the registry that the metadata is closed. We were unable | |
526 | * to push anything and this means that either the consumer is not | |
527 | * responding or the metadata cache has been destroyed on the consumer. | |
528 | */ | |
529 | registry->metadata_closed = 1; | |
530 | } | |
331744e3 JD |
531 | pthread_mutex_unlock(®istry->lock); |
532 | error_push: | |
533 | free(metadata_str); | |
534 | return ret_val; | |
535 | } | |
536 | ||
d88aee68 | 537 | /* |
008b9675 | 538 | * For a given application and session, push metadata to consumer. |
331744e3 JD |
539 | * Either sock or consumer is required : if sock is NULL, the default |
540 | * socket to send the metadata is retrieved from consumer, if sock | |
541 | * is not NULL we use it to send the metadata. | |
008b9675 MD |
542 | * RCU read-side lock must be held while calling this function, |
543 | * therefore ensuring existance of registry. | |
d88aee68 DG |
544 | * |
545 | * Return 0 on success else a negative error. | |
546 | */ | |
7972aab2 DG |
547 | static int push_metadata(struct ust_registry_session *registry, |
548 | struct consumer_output *consumer) | |
d88aee68 | 549 | { |
331744e3 JD |
550 | int ret_val; |
551 | ssize_t ret; | |
d88aee68 DG |
552 | struct consumer_socket *socket; |
553 | ||
7972aab2 DG |
554 | assert(registry); |
555 | assert(consumer); | |
556 | ||
008b9675 | 557 | pthread_mutex_lock(®istry->lock); |
d88aee68 | 558 | |
008b9675 MD |
559 | if (registry->metadata_closed) { |
560 | pthread_mutex_unlock(®istry->lock); | |
561 | return -EPIPE; | |
d88aee68 DG |
562 | } |
563 | ||
d88aee68 | 564 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
565 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
566 | consumer); | |
008b9675 | 567 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 568 | if (!socket) { |
331744e3 | 569 | ret_val = -1; |
008b9675 | 570 | goto error; |
d88aee68 DG |
571 | } |
572 | ||
573 | /* | |
574 | * TODO: Currently, we hold the socket lock around sampling of the next | |
575 | * metadata segment to ensure we send metadata over the consumer socket in | |
576 | * the correct order. This makes the registry lock nest inside the socket | |
577 | * lock. | |
578 | * | |
579 | * Please note that this is a temporary measure: we should move this lock | |
580 | * back into ust_consumer_push_metadata() when the consumer gets the | |
581 | * ability to reorder the metadata it receives. | |
582 | */ | |
583 | pthread_mutex_lock(socket->lock); | |
331744e3 JD |
584 | ret = ust_app_push_metadata(registry, socket, 0); |
585 | pthread_mutex_unlock(socket->lock); | |
d88aee68 | 586 | if (ret < 0) { |
331744e3 | 587 | ret_val = ret; |
008b9675 | 588 | goto error; |
d88aee68 DG |
589 | } |
590 | ||
d88aee68 DG |
591 | return 0; |
592 | ||
008b9675 MD |
593 | error: |
594 | end: | |
331744e3 | 595 | return ret_val; |
d88aee68 DG |
596 | } |
597 | ||
598 | /* | |
599 | * Send to the consumer a close metadata command for the given session. Once | |
600 | * done, the metadata channel is deleted and the session metadata pointer is | |
601 | * nullified. The session lock MUST be acquired here unless the application is | |
602 | * in the destroy path. | |
603 | * | |
604 | * Return 0 on success else a negative value. | |
605 | */ | |
7972aab2 DG |
606 | static int close_metadata(struct ust_registry_session *registry, |
607 | struct consumer_output *consumer) | |
d88aee68 DG |
608 | { |
609 | int ret; | |
610 | struct consumer_socket *socket; | |
611 | ||
7972aab2 DG |
612 | assert(registry); |
613 | assert(consumer); | |
d88aee68 | 614 | |
7972aab2 DG |
615 | rcu_read_lock(); |
616 | ||
008b9675 MD |
617 | pthread_mutex_lock(®istry->lock); |
618 | ||
7972aab2 | 619 | if (!registry->metadata_key || registry->metadata_closed) { |
d88aee68 | 620 | ret = 0; |
1b532a60 | 621 | goto end; |
d88aee68 DG |
622 | } |
623 | ||
d88aee68 | 624 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
625 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
626 | consumer); | |
d88aee68 DG |
627 | if (!socket) { |
628 | ret = -1; | |
7972aab2 | 629 | goto error; |
d88aee68 DG |
630 | } |
631 | ||
7972aab2 | 632 | ret = consumer_close_metadata(socket, registry->metadata_key); |
d88aee68 | 633 | if (ret < 0) { |
7972aab2 | 634 | goto error; |
d88aee68 DG |
635 | } |
636 | ||
d88aee68 | 637 | error: |
1b532a60 DG |
638 | /* |
639 | * Metadata closed. Even on error this means that the consumer is not | |
640 | * responding or not found so either way a second close should NOT be emit | |
641 | * for this registry. | |
642 | */ | |
643 | registry->metadata_closed = 1; | |
644 | end: | |
008b9675 | 645 | pthread_mutex_unlock(®istry->lock); |
7972aab2 | 646 | rcu_read_unlock(); |
d88aee68 DG |
647 | return ret; |
648 | } | |
649 | ||
36b588ed MD |
650 | /* |
651 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
652 | * section and outside of call_rcu thread, so we postpone its execution |
653 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
654 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
655 | */ |
656 | static | |
657 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
658 | { | |
659 | struct ust_app_session *ua_sess = | |
660 | caa_container_of(head, struct ust_app_session, rcu_head); | |
661 | ||
0b2dc8df | 662 | ht_cleanup_push(ua_sess->channels); |
36b588ed MD |
663 | free(ua_sess); |
664 | } | |
665 | ||
d80a6244 DG |
666 | /* |
667 | * Delete ust app session safely. RCU read lock must be held before calling | |
668 | * this function. | |
669 | */ | |
8b366481 | 670 | static |
d0b96690 DG |
671 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
672 | struct ust_app *app) | |
d80a6244 DG |
673 | { |
674 | int ret; | |
bec39940 | 675 | struct lttng_ht_iter iter; |
d80a6244 | 676 | struct ust_app_channel *ua_chan; |
7972aab2 | 677 | struct ust_registry_session *registry; |
d80a6244 | 678 | |
d88aee68 DG |
679 | assert(ua_sess); |
680 | ||
1b532a60 DG |
681 | pthread_mutex_lock(&ua_sess->lock); |
682 | ||
7972aab2 | 683 | registry = get_session_registry(ua_sess); |
008b9675 | 684 | if (registry) { |
d88aee68 | 685 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 686 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 687 | |
7972aab2 DG |
688 | /* |
689 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
690 | * metadata only on destroy trace session in this case. Also, the |
691 | * previous push metadata could have flag the metadata registry to | |
692 | * close so don't send a close command if closed. | |
7972aab2 | 693 | */ |
008b9675 | 694 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
695 | /* And ask to close it for this session registry. */ |
696 | (void) close_metadata(registry, ua_sess->consumer); | |
697 | } | |
d80a6244 DG |
698 | } |
699 | ||
bec39940 DG |
700 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
701 | node.node) { | |
702 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 703 | assert(!ret); |
d0b96690 | 704 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 705 | } |
d80a6244 | 706 | |
7972aab2 DG |
707 | /* In case of per PID, the registry is kept in the session. */ |
708 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
709 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
710 | if (reg_pid) { | |
711 | buffer_reg_pid_remove(reg_pid); | |
712 | buffer_reg_pid_destroy(reg_pid); | |
713 | } | |
714 | } | |
d0b96690 | 715 | |
aee6bafd | 716 | if (ua_sess->handle != -1) { |
ffe60014 DG |
717 | ret = ustctl_release_handle(sock, ua_sess->handle); |
718 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
719 | ERR("UST app sock %d release session handle failed with ret %d", | |
720 | sock, ret); | |
721 | } | |
aee6bafd | 722 | } |
1b532a60 DG |
723 | pthread_mutex_unlock(&ua_sess->lock); |
724 | ||
36b588ed | 725 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 726 | } |
91d76f53 DG |
727 | |
728 | /* | |
284d8f55 DG |
729 | * Delete a traceable application structure from the global list. Never call |
730 | * this function outside of a call_rcu call. | |
36b588ed MD |
731 | * |
732 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 733 | */ |
8b366481 DG |
734 | static |
735 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 736 | { |
8b366481 | 737 | int ret, sock; |
d42f20df | 738 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 739 | |
d80a6244 | 740 | /* Delete ust app sessions info */ |
852d0037 DG |
741 | sock = app->sock; |
742 | app->sock = -1; | |
d80a6244 | 743 | |
8b366481 | 744 | /* Wipe sessions */ |
d42f20df DG |
745 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
746 | teardown_node) { | |
747 | /* Free every object in the session and the session. */ | |
36b588ed | 748 | rcu_read_lock(); |
d0b96690 | 749 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 750 | rcu_read_unlock(); |
d80a6244 | 751 | } |
36b588ed | 752 | |
0b2dc8df MD |
753 | ht_cleanup_push(app->sessions); |
754 | ht_cleanup_push(app->ust_objd); | |
d80a6244 | 755 | |
6414a713 | 756 | /* |
852d0037 DG |
757 | * Wait until we have deleted the application from the sock hash table |
758 | * before closing this socket, otherwise an application could re-use the | |
759 | * socket ID and race with the teardown, using the same hash table entry. | |
760 | * | |
761 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
762 | * all RCU readers that could run concurrently with unregister app, | |
763 | * therefore we _need_ to only close that socket after a grace period. So | |
764 | * it should stay in this RCU callback. | |
765 | * | |
766 | * This close() is a very important step of the synchronization model so | |
767 | * every modification to this function must be carefully reviewed. | |
6414a713 | 768 | */ |
799e2c4f MD |
769 | ret = close(sock); |
770 | if (ret) { | |
771 | PERROR("close"); | |
772 | } | |
4063050c | 773 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 774 | |
852d0037 | 775 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 776 | free(app); |
099e26bd DG |
777 | } |
778 | ||
779 | /* | |
f6a9efaa | 780 | * URCU intermediate call to delete an UST app. |
099e26bd | 781 | */ |
8b366481 DG |
782 | static |
783 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 784 | { |
bec39940 DG |
785 | struct lttng_ht_node_ulong *node = |
786 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 787 | struct ust_app *app = |
852d0037 | 788 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 789 | |
852d0037 | 790 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 791 | delete_ust_app(app); |
099e26bd DG |
792 | } |
793 | ||
ffe60014 DG |
794 | /* |
795 | * Delete the session from the application ht and delete the data structure by | |
796 | * freeing every object inside and releasing them. | |
797 | */ | |
d0b96690 | 798 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
799 | struct ust_app_session *ua_sess) |
800 | { | |
801 | int ret; | |
802 | struct lttng_ht_iter iter; | |
803 | ||
804 | assert(app); | |
805 | assert(ua_sess); | |
806 | ||
807 | iter.iter.node = &ua_sess->node.node; | |
808 | ret = lttng_ht_del(app->sessions, &iter); | |
809 | if (ret) { | |
810 | /* Already scheduled for teardown. */ | |
811 | goto end; | |
812 | } | |
813 | ||
814 | /* Once deleted, free the data structure. */ | |
d0b96690 | 815 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
816 | |
817 | end: | |
818 | return; | |
819 | } | |
820 | ||
8b366481 DG |
821 | /* |
822 | * Alloc new UST app session. | |
823 | */ | |
824 | static | |
d0b96690 | 825 | struct ust_app_session *alloc_ust_app_session(struct ust_app *app) |
8b366481 DG |
826 | { |
827 | struct ust_app_session *ua_sess; | |
828 | ||
829 | /* Init most of the default value by allocating and zeroing */ | |
830 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
831 | if (ua_sess == NULL) { | |
832 | PERROR("malloc"); | |
ffe60014 | 833 | goto error_free; |
8b366481 DG |
834 | } |
835 | ||
836 | ua_sess->handle = -1; | |
bec39940 | 837 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
ce4846f7 | 838 | ua_sess->metadata_attr.type = LTTNG_UST_CHAN_METADATA; |
4e4e68f4 | 839 | pthread_mutex_init(&ua_sess->lock, NULL); |
ce4846f7 | 840 | |
8b366481 DG |
841 | return ua_sess; |
842 | ||
ffe60014 | 843 | error_free: |
8b366481 DG |
844 | return NULL; |
845 | } | |
846 | ||
847 | /* | |
848 | * Alloc new UST app channel. | |
849 | */ | |
850 | static | |
851 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 852 | struct ust_app_session *ua_sess, |
ffe60014 | 853 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
854 | { |
855 | struct ust_app_channel *ua_chan; | |
856 | ||
857 | /* Init most of the default value by allocating and zeroing */ | |
858 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
859 | if (ua_chan == NULL) { | |
860 | PERROR("malloc"); | |
861 | goto error; | |
862 | } | |
863 | ||
864 | /* Setup channel name */ | |
865 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
866 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
867 | ||
868 | ua_chan->enabled = 1; | |
869 | ua_chan->handle = -1; | |
45893984 | 870 | ua_chan->session = ua_sess; |
ffe60014 | 871 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
872 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
873 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
874 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
875 | |
876 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
31746f93 | 877 | CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); |
8b366481 DG |
878 | |
879 | /* Copy attributes */ | |
880 | if (attr) { | |
ffe60014 | 881 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
882 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
883 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
884 | ua_chan->attr.overwrite = attr->overwrite; | |
885 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
886 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
887 | ua_chan->attr.output = attr->output; | |
8b366481 | 888 | } |
ffe60014 DG |
889 | /* By default, the channel is a per cpu channel. */ |
890 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
891 | |
892 | DBG3("UST app channel %s allocated", ua_chan->name); | |
893 | ||
894 | return ua_chan; | |
895 | ||
896 | error: | |
897 | return NULL; | |
898 | } | |
899 | ||
37f1c236 DG |
900 | /* |
901 | * Allocate and initialize a UST app stream. | |
902 | * | |
903 | * Return newly allocated stream pointer or NULL on error. | |
904 | */ | |
ffe60014 | 905 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
906 | { |
907 | struct ust_app_stream *stream = NULL; | |
908 | ||
909 | stream = zmalloc(sizeof(*stream)); | |
910 | if (stream == NULL) { | |
911 | PERROR("zmalloc ust app stream"); | |
912 | goto error; | |
913 | } | |
914 | ||
915 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
916 | stream->handle = -1; | |
917 | ||
918 | error: | |
919 | return stream; | |
920 | } | |
921 | ||
8b366481 DG |
922 | /* |
923 | * Alloc new UST app event. | |
924 | */ | |
925 | static | |
926 | struct ust_app_event *alloc_ust_app_event(char *name, | |
927 | struct lttng_ust_event *attr) | |
928 | { | |
929 | struct ust_app_event *ua_event; | |
930 | ||
931 | /* Init most of the default value by allocating and zeroing */ | |
932 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
933 | if (ua_event == NULL) { | |
934 | PERROR("malloc"); | |
935 | goto error; | |
936 | } | |
937 | ||
938 | ua_event->enabled = 1; | |
939 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
940 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 941 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
942 | |
943 | /* Copy attributes */ | |
944 | if (attr) { | |
945 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
946 | } | |
947 | ||
948 | DBG3("UST app event %s allocated", ua_event->name); | |
949 | ||
950 | return ua_event; | |
951 | ||
952 | error: | |
953 | return NULL; | |
954 | } | |
955 | ||
956 | /* | |
957 | * Alloc new UST app context. | |
958 | */ | |
959 | static | |
960 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx) | |
961 | { | |
962 | struct ust_app_ctx *ua_ctx; | |
963 | ||
964 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
965 | if (ua_ctx == NULL) { | |
966 | goto error; | |
967 | } | |
968 | ||
31746f93 DG |
969 | CDS_INIT_LIST_HEAD(&ua_ctx->list); |
970 | ||
8b366481 DG |
971 | if (uctx) { |
972 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
973 | } | |
974 | ||
975 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
976 | ||
977 | error: | |
978 | return ua_ctx; | |
979 | } | |
980 | ||
025faf73 DG |
981 | /* |
982 | * Allocate a filter and copy the given original filter. | |
983 | * | |
984 | * Return allocated filter or NULL on error. | |
985 | */ | |
986 | static struct lttng_ust_filter_bytecode *alloc_copy_ust_app_filter( | |
987 | struct lttng_ust_filter_bytecode *orig_f) | |
988 | { | |
989 | struct lttng_ust_filter_bytecode *filter = NULL; | |
990 | ||
991 | /* Copy filter bytecode */ | |
992 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
993 | if (!filter) { | |
994 | PERROR("zmalloc alloc ust app filter"); | |
995 | goto error; | |
996 | } | |
997 | ||
998 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
999 | ||
1000 | error: | |
1001 | return filter; | |
1002 | } | |
1003 | ||
099e26bd | 1004 | /* |
421cb601 DG |
1005 | * Find an ust_app using the sock and return it. RCU read side lock must be |
1006 | * held before calling this helper function. | |
099e26bd | 1007 | */ |
f20baf8e | 1008 | struct ust_app *ust_app_find_by_sock(int sock) |
099e26bd | 1009 | { |
bec39940 | 1010 | struct lttng_ht_node_ulong *node; |
bec39940 | 1011 | struct lttng_ht_iter iter; |
f6a9efaa | 1012 | |
852d0037 | 1013 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 1014 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
1015 | if (node == NULL) { |
1016 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
1017 | goto error; |
1018 | } | |
852d0037 DG |
1019 | |
1020 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
1021 | |
1022 | error: | |
1023 | return NULL; | |
099e26bd DG |
1024 | } |
1025 | ||
d0b96690 DG |
1026 | /* |
1027 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
1028 | * be held before calling this helper function. | |
1029 | */ | |
1030 | static struct ust_app *find_app_by_notify_sock(int sock) | |
1031 | { | |
1032 | struct lttng_ht_node_ulong *node; | |
1033 | struct lttng_ht_iter iter; | |
1034 | ||
1035 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
1036 | &iter); | |
1037 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1038 | if (node == NULL) { | |
1039 | DBG2("UST app find by notify sock %d not found", sock); | |
1040 | goto error; | |
1041 | } | |
1042 | ||
1043 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
1044 | ||
1045 | error: | |
1046 | return NULL; | |
1047 | } | |
1048 | ||
025faf73 DG |
1049 | /* |
1050 | * Lookup for an ust app event based on event name, filter bytecode and the | |
1051 | * event loglevel. | |
1052 | * | |
1053 | * Return an ust_app_event object or NULL on error. | |
1054 | */ | |
18eace3b | 1055 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
39c5a3a7 JI |
1056 | char *name, struct lttng_ust_filter_bytecode *filter, int loglevel, |
1057 | const struct lttng_event_exclusion *exclusion) | |
18eace3b DG |
1058 | { |
1059 | struct lttng_ht_iter iter; | |
1060 | struct lttng_ht_node_str *node; | |
1061 | struct ust_app_event *event = NULL; | |
1062 | struct ust_app_ht_key key; | |
18eace3b DG |
1063 | |
1064 | assert(name); | |
1065 | assert(ht); | |
1066 | ||
1067 | /* Setup key for event lookup. */ | |
1068 | key.name = name; | |
1069 | key.filter = filter; | |
1070 | key.loglevel = loglevel; | |
39c5a3a7 JI |
1071 | /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */ |
1072 | key.exclusion = (struct lttng_ust_event_exclusion *)exclusion; | |
18eace3b | 1073 | |
025faf73 DG |
1074 | /* Lookup using the event name as hash and a custom match fct. */ |
1075 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1076 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1077 | node = lttng_ht_iter_get_node_str(&iter); |
1078 | if (node == NULL) { | |
1079 | goto end; | |
1080 | } | |
1081 | ||
1082 | event = caa_container_of(node, struct ust_app_event, node); | |
1083 | ||
1084 | end: | |
18eace3b DG |
1085 | return event; |
1086 | } | |
1087 | ||
55cc08a6 DG |
1088 | /* |
1089 | * Create the channel context on the tracer. | |
d0b96690 DG |
1090 | * |
1091 | * Called with UST app session lock held. | |
55cc08a6 DG |
1092 | */ |
1093 | static | |
1094 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1095 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1096 | { | |
1097 | int ret; | |
1098 | ||
840cb59c | 1099 | health_code_update(); |
86acf0da | 1100 | |
852d0037 | 1101 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 DG |
1102 | ua_chan->obj, &ua_ctx->obj); |
1103 | if (ret < 0) { | |
ffe60014 DG |
1104 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1105 | ERR("UST app create channel context failed for app (pid: %d) " | |
1106 | "with ret %d", app->pid, ret); | |
1107 | } else { | |
3757b385 DG |
1108 | /* |
1109 | * This is normal behavior, an application can die during the | |
1110 | * creation process. Don't report an error so the execution can | |
1111 | * continue normally. | |
1112 | */ | |
1113 | ret = 0; | |
ffe60014 DG |
1114 | DBG3("UST app disable event failed. Application is dead."); |
1115 | } | |
55cc08a6 DG |
1116 | goto error; |
1117 | } | |
1118 | ||
1119 | ua_ctx->handle = ua_ctx->obj->handle; | |
1120 | ||
d0b96690 DG |
1121 | DBG2("UST app context handle %d created successfully for channel %s", |
1122 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1123 | |
1124 | error: | |
840cb59c | 1125 | health_code_update(); |
55cc08a6 DG |
1126 | return ret; |
1127 | } | |
1128 | ||
53a80697 MD |
1129 | /* |
1130 | * Set the filter on the tracer. | |
1131 | */ | |
1132 | static | |
1133 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
1134 | struct ust_app *app) | |
1135 | { | |
1136 | int ret; | |
1137 | ||
840cb59c | 1138 | health_code_update(); |
86acf0da | 1139 | |
53a80697 | 1140 | if (!ua_event->filter) { |
86acf0da DG |
1141 | ret = 0; |
1142 | goto error; | |
53a80697 MD |
1143 | } |
1144 | ||
1145 | ret = ustctl_set_filter(app->sock, ua_event->filter, | |
1146 | ua_event->obj); | |
1147 | if (ret < 0) { | |
ffe60014 DG |
1148 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1149 | ERR("UST app event %s filter failed for app (pid: %d) " | |
1150 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1151 | } else { | |
3757b385 DG |
1152 | /* |
1153 | * This is normal behavior, an application can die during the | |
1154 | * creation process. Don't report an error so the execution can | |
1155 | * continue normally. | |
1156 | */ | |
1157 | ret = 0; | |
ffe60014 DG |
1158 | DBG3("UST app filter event failed. Application is dead."); |
1159 | } | |
53a80697 MD |
1160 | goto error; |
1161 | } | |
1162 | ||
1163 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
1164 | ||
1165 | error: | |
840cb59c | 1166 | health_code_update(); |
53a80697 MD |
1167 | return ret; |
1168 | } | |
1169 | ||
7cc9a73c JI |
1170 | /* |
1171 | * Set event exclusions on the tracer. | |
1172 | */ | |
1173 | static | |
1174 | int set_ust_event_exclusion(struct ust_app_event *ua_event, | |
1175 | struct ust_app *app) | |
1176 | { | |
1177 | int ret; | |
1178 | ||
1179 | health_code_update(); | |
1180 | ||
1181 | if (!ua_event->exclusion || !ua_event->exclusion->count) { | |
1182 | ret = 0; | |
1183 | goto error; | |
1184 | } | |
1185 | ||
1186 | ret = ustctl_set_exclusion(app->sock, ua_event->exclusion, | |
1187 | ua_event->obj); | |
1188 | if (ret < 0) { | |
1189 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1190 | ERR("UST app event %s exclusions failed for app (pid: %d) " | |
1191 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1192 | } else { | |
1193 | /* | |
1194 | * This is normal behavior, an application can die during the | |
1195 | * creation process. Don't report an error so the execution can | |
1196 | * continue normally. | |
1197 | */ | |
1198 | ret = 0; | |
1199 | DBG3("UST app event exclusion failed. Application is dead."); | |
1200 | } | |
1201 | goto error; | |
1202 | } | |
1203 | ||
1204 | DBG2("UST exclusion set successfully for event %s", ua_event->name); | |
1205 | ||
1206 | error: | |
1207 | health_code_update(); | |
1208 | return ret; | |
1209 | } | |
1210 | ||
9730260e DG |
1211 | /* |
1212 | * Disable the specified event on to UST tracer for the UST session. | |
1213 | */ | |
1214 | static int disable_ust_event(struct ust_app *app, | |
1215 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1216 | { | |
1217 | int ret; | |
1218 | ||
840cb59c | 1219 | health_code_update(); |
86acf0da | 1220 | |
852d0037 | 1221 | ret = ustctl_disable(app->sock, ua_event->obj); |
9730260e | 1222 | if (ret < 0) { |
ffe60014 DG |
1223 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1224 | ERR("UST app event %s disable failed for app (pid: %d) " | |
1225 | "and session handle %d with ret %d", | |
1226 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1227 | } else { | |
3757b385 DG |
1228 | /* |
1229 | * This is normal behavior, an application can die during the | |
1230 | * creation process. Don't report an error so the execution can | |
1231 | * continue normally. | |
1232 | */ | |
1233 | ret = 0; | |
ffe60014 DG |
1234 | DBG3("UST app disable event failed. Application is dead."); |
1235 | } | |
9730260e DG |
1236 | goto error; |
1237 | } | |
1238 | ||
1239 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 1240 | ua_event->attr.name, app->pid); |
9730260e DG |
1241 | |
1242 | error: | |
840cb59c | 1243 | health_code_update(); |
9730260e DG |
1244 | return ret; |
1245 | } | |
1246 | ||
78f0bacd DG |
1247 | /* |
1248 | * Disable the specified channel on to UST tracer for the UST session. | |
1249 | */ | |
1250 | static int disable_ust_channel(struct ust_app *app, | |
1251 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1252 | { | |
1253 | int ret; | |
1254 | ||
840cb59c | 1255 | health_code_update(); |
86acf0da | 1256 | |
852d0037 | 1257 | ret = ustctl_disable(app->sock, ua_chan->obj); |
78f0bacd | 1258 | if (ret < 0) { |
ffe60014 DG |
1259 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1260 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1261 | "and session handle %d with ret %d", | |
1262 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1263 | } else { | |
3757b385 DG |
1264 | /* |
1265 | * This is normal behavior, an application can die during the | |
1266 | * creation process. Don't report an error so the execution can | |
1267 | * continue normally. | |
1268 | */ | |
1269 | ret = 0; | |
ffe60014 DG |
1270 | DBG3("UST app disable channel failed. Application is dead."); |
1271 | } | |
78f0bacd DG |
1272 | goto error; |
1273 | } | |
1274 | ||
78f0bacd | 1275 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1276 | ua_chan->name, app->pid); |
78f0bacd DG |
1277 | |
1278 | error: | |
840cb59c | 1279 | health_code_update(); |
78f0bacd DG |
1280 | return ret; |
1281 | } | |
1282 | ||
1283 | /* | |
1284 | * Enable the specified channel on to UST tracer for the UST session. | |
1285 | */ | |
1286 | static int enable_ust_channel(struct ust_app *app, | |
1287 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1288 | { | |
1289 | int ret; | |
1290 | ||
840cb59c | 1291 | health_code_update(); |
86acf0da | 1292 | |
852d0037 | 1293 | ret = ustctl_enable(app->sock, ua_chan->obj); |
78f0bacd | 1294 | if (ret < 0) { |
ffe60014 DG |
1295 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1296 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1297 | "and session handle %d with ret %d", | |
1298 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1299 | } else { | |
3757b385 DG |
1300 | /* |
1301 | * This is normal behavior, an application can die during the | |
1302 | * creation process. Don't report an error so the execution can | |
1303 | * continue normally. | |
1304 | */ | |
1305 | ret = 0; | |
ffe60014 DG |
1306 | DBG3("UST app enable channel failed. Application is dead."); |
1307 | } | |
78f0bacd DG |
1308 | goto error; |
1309 | } | |
1310 | ||
1311 | ua_chan->enabled = 1; | |
1312 | ||
1313 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1314 | ua_chan->name, app->pid); |
78f0bacd DG |
1315 | |
1316 | error: | |
840cb59c | 1317 | health_code_update(); |
78f0bacd DG |
1318 | return ret; |
1319 | } | |
1320 | ||
edb67388 DG |
1321 | /* |
1322 | * Enable the specified event on to UST tracer for the UST session. | |
1323 | */ | |
1324 | static int enable_ust_event(struct ust_app *app, | |
1325 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1326 | { | |
1327 | int ret; | |
1328 | ||
840cb59c | 1329 | health_code_update(); |
86acf0da | 1330 | |
852d0037 | 1331 | ret = ustctl_enable(app->sock, ua_event->obj); |
edb67388 | 1332 | if (ret < 0) { |
ffe60014 DG |
1333 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1334 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1335 | "and session handle %d with ret %d", | |
1336 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1337 | } else { | |
3757b385 DG |
1338 | /* |
1339 | * This is normal behavior, an application can die during the | |
1340 | * creation process. Don't report an error so the execution can | |
1341 | * continue normally. | |
1342 | */ | |
1343 | ret = 0; | |
ffe60014 DG |
1344 | DBG3("UST app enable event failed. Application is dead."); |
1345 | } | |
edb67388 DG |
1346 | goto error; |
1347 | } | |
1348 | ||
1349 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1350 | ua_event->attr.name, app->pid); |
edb67388 DG |
1351 | |
1352 | error: | |
840cb59c | 1353 | health_code_update(); |
edb67388 DG |
1354 | return ret; |
1355 | } | |
1356 | ||
099e26bd | 1357 | /* |
7972aab2 | 1358 | * Send channel and stream buffer to application. |
4f3ab6ee | 1359 | * |
ffe60014 | 1360 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1361 | */ |
7972aab2 DG |
1362 | static int send_channel_pid_to_ust(struct ust_app *app, |
1363 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1364 | { |
1365 | int ret; | |
ffe60014 | 1366 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1367 | |
1368 | assert(app); | |
ffe60014 | 1369 | assert(ua_sess); |
4f3ab6ee | 1370 | assert(ua_chan); |
4f3ab6ee | 1371 | |
840cb59c | 1372 | health_code_update(); |
4f3ab6ee | 1373 | |
7972aab2 DG |
1374 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1375 | app->sock); | |
86acf0da | 1376 | |
ffe60014 DG |
1377 | /* Send channel to the application. */ |
1378 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
5b4a0ec0 | 1379 | if (ret < 0) { |
b551a063 DG |
1380 | goto error; |
1381 | } | |
1382 | ||
d88aee68 DG |
1383 | health_code_update(); |
1384 | ||
ffe60014 DG |
1385 | /* Send all streams to application. */ |
1386 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1387 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
1388 | if (ret < 0) { | |
1389 | goto error; | |
1390 | } | |
1391 | /* We don't need the stream anymore once sent to the tracer. */ | |
1392 | cds_list_del(&stream->list); | |
1393 | delete_ust_app_stream(-1, stream); | |
1394 | } | |
ffe60014 DG |
1395 | /* Flag the channel that it is sent to the application. */ |
1396 | ua_chan->is_sent = 1; | |
ffe60014 | 1397 | |
b551a063 | 1398 | error: |
840cb59c | 1399 | health_code_update(); |
b551a063 DG |
1400 | return ret; |
1401 | } | |
1402 | ||
91d76f53 | 1403 | /* |
5b4a0ec0 | 1404 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1405 | * |
1406 | * Should be called with session mutex held. | |
91d76f53 | 1407 | */ |
edb67388 DG |
1408 | static |
1409 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1410 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1411 | { |
5b4a0ec0 | 1412 | int ret = 0; |
284d8f55 | 1413 | |
840cb59c | 1414 | health_code_update(); |
86acf0da | 1415 | |
5b4a0ec0 | 1416 | /* Create UST event on tracer */ |
852d0037 | 1417 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 DG |
1418 | &ua_event->obj); |
1419 | if (ret < 0) { | |
ffe60014 DG |
1420 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1421 | ERR("Error ustctl create event %s for app pid: %d with ret %d", | |
1422 | ua_event->attr.name, app->pid, ret); | |
1423 | } else { | |
3757b385 DG |
1424 | /* |
1425 | * This is normal behavior, an application can die during the | |
1426 | * creation process. Don't report an error so the execution can | |
1427 | * continue normally. | |
1428 | */ | |
1429 | ret = 0; | |
ffe60014 DG |
1430 | DBG3("UST app create event failed. Application is dead."); |
1431 | } | |
5b4a0ec0 | 1432 | goto error; |
91d76f53 | 1433 | } |
f6a9efaa | 1434 | |
5b4a0ec0 | 1435 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1436 | |
5b4a0ec0 | 1437 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1438 | ua_event->attr.name, app->pid); |
f6a9efaa | 1439 | |
840cb59c | 1440 | health_code_update(); |
86acf0da | 1441 | |
025faf73 DG |
1442 | /* Set filter if one is present. */ |
1443 | if (ua_event->filter) { | |
1444 | ret = set_ust_event_filter(ua_event, app); | |
1445 | if (ret < 0) { | |
1446 | goto error; | |
1447 | } | |
1448 | } | |
1449 | ||
7cc9a73c JI |
1450 | /* Set exclusions for the event */ |
1451 | if (ua_event->exclusion) { | |
1452 | ret = set_ust_event_exclusion(ua_event, app); | |
1453 | if (ret < 0) { | |
1454 | goto error; | |
1455 | } | |
1456 | } | |
1457 | ||
8535a6d9 | 1458 | /* If event not enabled, disable it on the tracer */ |
28158fad MD |
1459 | if (ua_event->enabled) { |
1460 | /* | |
1461 | * We now need to explicitly enable the event, since it | |
1462 | * is now disabled at creation. | |
1463 | */ | |
1464 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1465 | if (ret < 0) { | |
1466 | /* | |
1467 | * If we hit an EPERM, something is wrong with our enable call. If | |
1468 | * we get an EEXIST, there is a problem on the tracer side since we | |
1469 | * just created it. | |
1470 | */ | |
1471 | switch (ret) { | |
1472 | case -LTTNG_UST_ERR_PERM: | |
1473 | /* Code flow problem */ | |
1474 | assert(0); | |
1475 | case -LTTNG_UST_ERR_EXIST: | |
1476 | /* It's OK for our use case. */ | |
1477 | ret = 0; | |
1478 | break; | |
1479 | default: | |
1480 | break; | |
1481 | } | |
1482 | goto error; | |
1483 | } | |
1484 | } else { | |
8535a6d9 DG |
1485 | ret = disable_ust_event(app, ua_sess, ua_event); |
1486 | if (ret < 0) { | |
fc34caaa DG |
1487 | /* |
1488 | * If we hit an EPERM, something is wrong with our disable call. If | |
1489 | * we get an EEXIST, there is a problem on the tracer side since we | |
1490 | * just created it. | |
1491 | */ | |
1492 | switch (ret) { | |
49c336c1 | 1493 | case -LTTNG_UST_ERR_PERM: |
fc34caaa DG |
1494 | /* Code flow problem */ |
1495 | assert(0); | |
49c336c1 | 1496 | case -LTTNG_UST_ERR_EXIST: |
fc34caaa DG |
1497 | /* It's OK for our use case. */ |
1498 | ret = 0; | |
1499 | break; | |
1500 | default: | |
1501 | break; | |
1502 | } | |
8535a6d9 DG |
1503 | goto error; |
1504 | } | |
1505 | } | |
1506 | ||
5b4a0ec0 | 1507 | error: |
840cb59c | 1508 | health_code_update(); |
5b4a0ec0 | 1509 | return ret; |
91d76f53 | 1510 | } |
48842b30 | 1511 | |
5b4a0ec0 DG |
1512 | /* |
1513 | * Copy data between an UST app event and a LTT event. | |
1514 | */ | |
421cb601 | 1515 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1516 | struct ltt_ust_event *uevent) |
1517 | { | |
b4ffad32 JI |
1518 | size_t exclusion_alloc_size; |
1519 | ||
48842b30 DG |
1520 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); |
1521 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1522 | ||
fc34caaa DG |
1523 | ua_event->enabled = uevent->enabled; |
1524 | ||
5b4a0ec0 DG |
1525 | /* Copy event attributes */ |
1526 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1527 | ||
53a80697 MD |
1528 | /* Copy filter bytecode */ |
1529 | if (uevent->filter) { | |
025faf73 DG |
1530 | ua_event->filter = alloc_copy_ust_app_filter(uevent->filter); |
1531 | /* Filter might be NULL here in case of ENONEM. */ | |
53a80697 | 1532 | } |
b4ffad32 JI |
1533 | |
1534 | /* Copy exclusion data */ | |
1535 | if (uevent->exclusion) { | |
1536 | exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) + | |
1537 | LTTNG_UST_SYM_NAME_LEN * uevent->exclusion->count; | |
1538 | ua_event->exclusion = zmalloc(exclusion_alloc_size); | |
5f8df26c JI |
1539 | if (ua_event->exclusion == NULL) { |
1540 | PERROR("malloc"); | |
1541 | } else { | |
1542 | memcpy(ua_event->exclusion, uevent->exclusion, | |
1543 | exclusion_alloc_size); | |
b4ffad32 JI |
1544 | } |
1545 | } | |
48842b30 DG |
1546 | } |
1547 | ||
5b4a0ec0 DG |
1548 | /* |
1549 | * Copy data between an UST app channel and a LTT channel. | |
1550 | */ | |
421cb601 | 1551 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1552 | struct ltt_ust_channel *uchan) |
1553 | { | |
bec39940 | 1554 | struct lttng_ht_iter iter; |
48842b30 | 1555 | struct ltt_ust_event *uevent; |
55cc08a6 | 1556 | struct ltt_ust_context *uctx; |
48842b30 | 1557 | struct ust_app_event *ua_event; |
55cc08a6 | 1558 | struct ust_app_ctx *ua_ctx; |
48842b30 | 1559 | |
fc34caaa | 1560 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1561 | |
1562 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1563 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 1564 | |
1624d5b7 JD |
1565 | ua_chan->tracefile_size = uchan->tracefile_size; |
1566 | ua_chan->tracefile_count = uchan->tracefile_count; | |
1567 | ||
ffe60014 DG |
1568 | /* Copy event attributes since the layout is different. */ |
1569 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1570 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1571 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1572 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1573 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
1574 | ua_chan->attr.output = uchan->attr.output; | |
1575 | /* | |
1576 | * Note that the attribute channel type is not set since the channel on the | |
1577 | * tracing registry side does not have this information. | |
1578 | */ | |
48842b30 | 1579 | |
fc34caaa | 1580 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1581 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1582 | |
31746f93 | 1583 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { |
55cc08a6 DG |
1584 | ua_ctx = alloc_ust_app_ctx(&uctx->ctx); |
1585 | if (ua_ctx == NULL) { | |
1586 | continue; | |
1587 | } | |
bec39940 DG |
1588 | lttng_ht_node_init_ulong(&ua_ctx->node, |
1589 | (unsigned long) ua_ctx->ctx.ctx); | |
1590 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
31746f93 | 1591 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
55cc08a6 | 1592 | } |
48842b30 | 1593 | |
421cb601 | 1594 | /* Copy all events from ltt ust channel to ust app channel */ |
bec39940 | 1595 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
18eace3b | 1596 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 1597 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 1598 | if (ua_event == NULL) { |
421cb601 | 1599 | DBG2("UST event %s not found on shadow copy channel", |
48842b30 | 1600 | uevent->attr.name); |
284d8f55 | 1601 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
48842b30 | 1602 | if (ua_event == NULL) { |
5b4a0ec0 | 1603 | continue; |
48842b30 | 1604 | } |
421cb601 | 1605 | shadow_copy_event(ua_event, uevent); |
d0b96690 | 1606 | add_unique_ust_app_event(ua_chan, ua_event); |
48842b30 | 1607 | } |
48842b30 DG |
1608 | } |
1609 | ||
fc34caaa | 1610 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1611 | } |
1612 | ||
5b4a0ec0 DG |
1613 | /* |
1614 | * Copy data between a UST app session and a regular LTT session. | |
1615 | */ | |
421cb601 | 1616 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1617 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1618 | { |
bec39940 DG |
1619 | struct lttng_ht_node_str *ua_chan_node; |
1620 | struct lttng_ht_iter iter; | |
48842b30 DG |
1621 | struct ltt_ust_channel *uchan; |
1622 | struct ust_app_channel *ua_chan; | |
477d7741 MD |
1623 | time_t rawtime; |
1624 | struct tm *timeinfo; | |
1625 | char datetime[16]; | |
1626 | int ret; | |
1627 | ||
1628 | /* Get date and time for unique app path */ | |
1629 | time(&rawtime); | |
1630 | timeinfo = localtime(&rawtime); | |
1631 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1632 | |
421cb601 | 1633 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1634 | |
7972aab2 DG |
1635 | ua_sess->tracing_id = usess->id; |
1636 | ua_sess->id = get_next_session_id(); | |
1637 | ua_sess->uid = app->uid; | |
1638 | ua_sess->gid = app->gid; | |
1639 | ua_sess->euid = usess->uid; | |
1640 | ua_sess->egid = usess->gid; | |
1641 | ua_sess->buffer_type = usess->buffer_type; | |
1642 | ua_sess->bits_per_long = app->bits_per_long; | |
1643 | /* There is only one consumer object per session possible. */ | |
1644 | ua_sess->consumer = usess->consumer; | |
2bba9e53 | 1645 | ua_sess->output_traces = usess->output_traces; |
ecc48a90 | 1646 | ua_sess->live_timer_interval = usess->live_timer_interval; |
4e4e68f4 DG |
1647 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, |
1648 | &usess->metadata_attr); | |
7972aab2 DG |
1649 | |
1650 | switch (ua_sess->buffer_type) { | |
1651 | case LTTNG_BUFFER_PER_PID: | |
1652 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 1653 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
1654 | datetime); |
1655 | break; | |
1656 | case LTTNG_BUFFER_PER_UID: | |
1657 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1658 | DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long); | |
1659 | break; | |
1660 | default: | |
1661 | assert(0); | |
1662 | goto error; | |
1663 | } | |
477d7741 MD |
1664 | if (ret < 0) { |
1665 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1666 | assert(0); |
7972aab2 | 1667 | goto error; |
477d7741 MD |
1668 | } |
1669 | ||
48842b30 | 1670 | /* Iterate over all channels in global domain. */ |
bec39940 DG |
1671 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, |
1672 | uchan, node.node) { | |
1673 | struct lttng_ht_iter uiter; | |
ba767faf | 1674 | |
bec39940 DG |
1675 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
1676 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
5b4a0ec0 | 1677 | if (ua_chan_node != NULL) { |
fc34caaa | 1678 | /* Session exist. Contiuing. */ |
5b4a0ec0 DG |
1679 | continue; |
1680 | } | |
421cb601 | 1681 | |
5b4a0ec0 DG |
1682 | DBG2("Channel %s not found on shadow session copy, creating it", |
1683 | uchan->name); | |
d0b96690 | 1684 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
5b4a0ec0 | 1685 | if (ua_chan == NULL) { |
fc34caaa | 1686 | /* malloc failed FIXME: Might want to do handle ENOMEM .. */ |
5b4a0ec0 | 1687 | continue; |
48842b30 | 1688 | } |
5b4a0ec0 | 1689 | shadow_copy_channel(ua_chan, uchan); |
ffe60014 DG |
1690 | /* |
1691 | * The concept of metadata channel does not exist on the tracing | |
1692 | * registry side of the session daemon so this can only be a per CPU | |
1693 | * channel and not metadata. | |
1694 | */ | |
1695 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
1696 | ||
bec39940 | 1697 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); |
48842b30 | 1698 | } |
7972aab2 DG |
1699 | |
1700 | error: | |
1701 | return; | |
48842b30 DG |
1702 | } |
1703 | ||
78f0bacd DG |
1704 | /* |
1705 | * Lookup sesison wrapper. | |
1706 | */ | |
84cd17c6 MD |
1707 | static |
1708 | void __lookup_session_by_app(struct ltt_ust_session *usess, | |
bec39940 | 1709 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1710 | { |
1711 | /* Get right UST app session from app */ | |
d9bf3ca4 | 1712 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
1713 | } |
1714 | ||
421cb601 DG |
1715 | /* |
1716 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1717 | * id. |
421cb601 | 1718 | */ |
48842b30 DG |
1719 | static struct ust_app_session *lookup_session_by_app( |
1720 | struct ltt_ust_session *usess, struct ust_app *app) | |
1721 | { | |
bec39940 | 1722 | struct lttng_ht_iter iter; |
d9bf3ca4 | 1723 | struct lttng_ht_node_u64 *node; |
48842b30 | 1724 | |
84cd17c6 | 1725 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 1726 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
1727 | if (node == NULL) { |
1728 | goto error; | |
1729 | } | |
1730 | ||
1731 | return caa_container_of(node, struct ust_app_session, node); | |
1732 | ||
1733 | error: | |
1734 | return NULL; | |
1735 | } | |
1736 | ||
7972aab2 DG |
1737 | /* |
1738 | * Setup buffer registry per PID for the given session and application. If none | |
1739 | * is found, a new one is created, added to the global registry and | |
1740 | * initialized. If regp is valid, it's set with the newly created object. | |
1741 | * | |
1742 | * Return 0 on success or else a negative value. | |
1743 | */ | |
1744 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
1745 | struct ust_app *app, struct buffer_reg_pid **regp) | |
1746 | { | |
1747 | int ret = 0; | |
1748 | struct buffer_reg_pid *reg_pid; | |
1749 | ||
1750 | assert(ua_sess); | |
1751 | assert(app); | |
1752 | ||
1753 | rcu_read_lock(); | |
1754 | ||
1755 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
1756 | if (!reg_pid) { | |
1757 | /* | |
1758 | * This is the create channel path meaning that if there is NO | |
1759 | * registry available, we have to create one for this session. | |
1760 | */ | |
1761 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid); | |
1762 | if (ret < 0) { | |
1763 | goto error; | |
1764 | } | |
1765 | buffer_reg_pid_add(reg_pid); | |
1766 | } else { | |
1767 | goto end; | |
1768 | } | |
1769 | ||
1770 | /* Initialize registry. */ | |
1771 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
1772 | app->bits_per_long, app->uint8_t_alignment, | |
1773 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1774 | app->uint64_t_alignment, app->long_alignment, |
1775 | app->byte_order, app->version.major, | |
1776 | app->version.minor); | |
7972aab2 DG |
1777 | if (ret < 0) { |
1778 | goto error; | |
1779 | } | |
1780 | ||
1781 | DBG3("UST app buffer registry per PID created successfully"); | |
1782 | ||
1783 | end: | |
1784 | if (regp) { | |
1785 | *regp = reg_pid; | |
1786 | } | |
1787 | error: | |
1788 | rcu_read_unlock(); | |
1789 | return ret; | |
1790 | } | |
1791 | ||
1792 | /* | |
1793 | * Setup buffer registry per UID for the given session and application. If none | |
1794 | * is found, a new one is created, added to the global registry and | |
1795 | * initialized. If regp is valid, it's set with the newly created object. | |
1796 | * | |
1797 | * Return 0 on success or else a negative value. | |
1798 | */ | |
1799 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
1800 | struct ust_app *app, struct buffer_reg_uid **regp) | |
1801 | { | |
1802 | int ret = 0; | |
1803 | struct buffer_reg_uid *reg_uid; | |
1804 | ||
1805 | assert(usess); | |
1806 | assert(app); | |
1807 | ||
1808 | rcu_read_lock(); | |
1809 | ||
1810 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
1811 | if (!reg_uid) { | |
1812 | /* | |
1813 | * This is the create channel path meaning that if there is NO | |
1814 | * registry available, we have to create one for this session. | |
1815 | */ | |
1816 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
1817 | LTTNG_DOMAIN_UST, ®_uid); | |
1818 | if (ret < 0) { | |
1819 | goto error; | |
1820 | } | |
1821 | buffer_reg_uid_add(reg_uid); | |
1822 | } else { | |
1823 | goto end; | |
1824 | } | |
1825 | ||
1826 | /* Initialize registry. */ | |
af6142cf | 1827 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
1828 | app->bits_per_long, app->uint8_t_alignment, |
1829 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1830 | app->uint64_t_alignment, app->long_alignment, |
1831 | app->byte_order, app->version.major, | |
1832 | app->version.minor); | |
7972aab2 DG |
1833 | if (ret < 0) { |
1834 | goto error; | |
1835 | } | |
1836 | /* Add node to teardown list of the session. */ | |
1837 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
1838 | ||
1839 | DBG3("UST app buffer registry per UID created successfully"); | |
1840 | ||
1841 | end: | |
1842 | if (regp) { | |
1843 | *regp = reg_uid; | |
1844 | } | |
1845 | error: | |
1846 | rcu_read_unlock(); | |
1847 | return ret; | |
1848 | } | |
1849 | ||
421cb601 | 1850 | /* |
3d8ca23b | 1851 | * Create a session on the tracer side for the given app. |
421cb601 | 1852 | * |
3d8ca23b DG |
1853 | * On success, ua_sess_ptr is populated with the session pointer or else left |
1854 | * untouched. If the session was created, is_created is set to 1. On error, | |
1855 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
1856 | * be NULL. | |
1857 | * | |
1858 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
1859 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 1860 | */ |
3d8ca23b DG |
1861 | static int create_ust_app_session(struct ltt_ust_session *usess, |
1862 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, | |
1863 | int *is_created) | |
421cb601 | 1864 | { |
3d8ca23b | 1865 | int ret, created = 0; |
421cb601 DG |
1866 | struct ust_app_session *ua_sess; |
1867 | ||
3d8ca23b DG |
1868 | assert(usess); |
1869 | assert(app); | |
1870 | assert(ua_sess_ptr); | |
1871 | ||
840cb59c | 1872 | health_code_update(); |
86acf0da | 1873 | |
421cb601 DG |
1874 | ua_sess = lookup_session_by_app(usess, app); |
1875 | if (ua_sess == NULL) { | |
d9bf3ca4 | 1876 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 1877 | app->pid, usess->id); |
d0b96690 | 1878 | ua_sess = alloc_ust_app_session(app); |
421cb601 DG |
1879 | if (ua_sess == NULL) { |
1880 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
1881 | ret = -ENOMEM; |
1882 | goto error; | |
421cb601 | 1883 | } |
477d7741 | 1884 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 1885 | created = 1; |
421cb601 DG |
1886 | } |
1887 | ||
7972aab2 DG |
1888 | switch (usess->buffer_type) { |
1889 | case LTTNG_BUFFER_PER_PID: | |
1890 | /* Init local registry. */ | |
1891 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 1892 | if (ret < 0) { |
7972aab2 DG |
1893 | goto error; |
1894 | } | |
1895 | break; | |
1896 | case LTTNG_BUFFER_PER_UID: | |
1897 | /* Look for a global registry. If none exists, create one. */ | |
1898 | ret = setup_buffer_reg_uid(usess, app, NULL); | |
1899 | if (ret < 0) { | |
1900 | goto error; | |
1901 | } | |
1902 | break; | |
1903 | default: | |
1904 | assert(0); | |
1905 | ret = -EINVAL; | |
1906 | goto error; | |
1907 | } | |
1908 | ||
1909 | health_code_update(); | |
1910 | ||
1911 | if (ua_sess->handle == -1) { | |
1912 | ret = ustctl_create_session(app->sock); | |
1913 | if (ret < 0) { | |
1914 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1915 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
1916 | app->pid, ret); |
1917 | } else { | |
1918 | DBG("UST app creating session failed. Application is dead"); | |
3757b385 DG |
1919 | /* |
1920 | * This is normal behavior, an application can die during the | |
1921 | * creation process. Don't report an error so the execution can | |
1922 | * continue normally. This will get flagged ENOTCONN and the | |
1923 | * caller will handle it. | |
1924 | */ | |
1925 | ret = 0; | |
ffe60014 | 1926 | } |
d0b96690 | 1927 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
1928 | if (ret != -ENOMEM) { |
1929 | /* | |
1930 | * Tracer is probably gone or got an internal error so let's | |
1931 | * behave like it will soon unregister or not usable. | |
1932 | */ | |
1933 | ret = -ENOTCONN; | |
1934 | } | |
1935 | goto error; | |
421cb601 DG |
1936 | } |
1937 | ||
7972aab2 DG |
1938 | ua_sess->handle = ret; |
1939 | ||
1940 | /* Add ust app session to app's HT */ | |
d9bf3ca4 MD |
1941 | lttng_ht_node_init_u64(&ua_sess->node, |
1942 | ua_sess->tracing_id); | |
1943 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
7972aab2 DG |
1944 | |
1945 | DBG2("UST app session created successfully with handle %d", ret); | |
1946 | } | |
1947 | ||
1948 | *ua_sess_ptr = ua_sess; | |
1949 | if (is_created) { | |
1950 | *is_created = created; | |
1951 | } | |
1952 | ||
1953 | /* Everything went well. */ | |
1954 | ret = 0; | |
1955 | ||
1956 | error: | |
1957 | health_code_update(); | |
1958 | return ret; | |
1959 | } | |
1960 | ||
1961 | /* | |
1962 | * Create a context for the channel on the tracer. | |
1963 | * | |
1964 | * Called with UST app session lock held and a RCU read side lock. | |
1965 | */ | |
1966 | static | |
1967 | int create_ust_app_channel_context(struct ust_app_session *ua_sess, | |
1968 | struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx, | |
1969 | struct ust_app *app) | |
1970 | { | |
1971 | int ret = 0; | |
1972 | struct lttng_ht_iter iter; | |
1973 | struct lttng_ht_node_ulong *node; | |
1974 | struct ust_app_ctx *ua_ctx; | |
1975 | ||
1976 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
1977 | ||
1978 | lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter); | |
1979 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1980 | if (node != NULL) { | |
1981 | ret = -EEXIST; | |
1982 | goto error; | |
1983 | } | |
1984 | ||
1985 | ua_ctx = alloc_ust_app_ctx(uctx); | |
1986 | if (ua_ctx == NULL) { | |
1987 | /* malloc failed */ | |
1988 | ret = -1; | |
1989 | goto error; | |
1990 | } | |
1991 | ||
1992 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
1993 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
31746f93 | 1994 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
1995 | |
1996 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
1997 | if (ret < 0) { | |
1998 | goto error; | |
1999 | } | |
2000 | ||
2001 | error: | |
2002 | return ret; | |
2003 | } | |
2004 | ||
2005 | /* | |
2006 | * Enable on the tracer side a ust app event for the session and channel. | |
2007 | * | |
2008 | * Called with UST app session lock held. | |
2009 | */ | |
2010 | static | |
2011 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
2012 | struct ust_app_event *ua_event, struct ust_app *app) | |
2013 | { | |
2014 | int ret; | |
2015 | ||
2016 | ret = enable_ust_event(app, ua_sess, ua_event); | |
2017 | if (ret < 0) { | |
2018 | goto error; | |
2019 | } | |
2020 | ||
2021 | ua_event->enabled = 1; | |
2022 | ||
2023 | error: | |
2024 | return ret; | |
2025 | } | |
2026 | ||
2027 | /* | |
2028 | * Disable on the tracer side a ust app event for the session and channel. | |
2029 | */ | |
2030 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
2031 | struct ust_app_event *ua_event, struct ust_app *app) | |
2032 | { | |
2033 | int ret; | |
2034 | ||
2035 | ret = disable_ust_event(app, ua_sess, ua_event); | |
2036 | if (ret < 0) { | |
2037 | goto error; | |
2038 | } | |
2039 | ||
2040 | ua_event->enabled = 0; | |
2041 | ||
2042 | error: | |
2043 | return ret; | |
2044 | } | |
2045 | ||
2046 | /* | |
2047 | * Lookup ust app channel for session and disable it on the tracer side. | |
2048 | */ | |
2049 | static | |
2050 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
2051 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
2052 | { | |
2053 | int ret; | |
2054 | ||
2055 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2056 | if (ret < 0) { | |
2057 | goto error; | |
2058 | } | |
2059 | ||
2060 | ua_chan->enabled = 0; | |
2061 | ||
2062 | error: | |
2063 | return ret; | |
2064 | } | |
2065 | ||
2066 | /* | |
2067 | * Lookup ust app channel for session and enable it on the tracer side. This | |
2068 | * MUST be called with a RCU read side lock acquired. | |
2069 | */ | |
2070 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
2071 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
2072 | { | |
2073 | int ret = 0; | |
2074 | struct lttng_ht_iter iter; | |
2075 | struct lttng_ht_node_str *ua_chan_node; | |
2076 | struct ust_app_channel *ua_chan; | |
2077 | ||
2078 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
2079 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
2080 | if (ua_chan_node == NULL) { | |
d9bf3ca4 | 2081 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
2082 | uchan->name, ua_sess->tracing_id); |
2083 | goto error; | |
2084 | } | |
2085 | ||
2086 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2087 | ||
2088 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
2089 | if (ret < 0) { | |
2090 | goto error; | |
2091 | } | |
2092 | ||
2093 | error: | |
2094 | return ret; | |
2095 | } | |
2096 | ||
2097 | /* | |
2098 | * Ask the consumer to create a channel and get it if successful. | |
2099 | * | |
2100 | * Return 0 on success or else a negative value. | |
2101 | */ | |
2102 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
2103 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
2104 | int bitness, struct ust_registry_session *registry) | |
2105 | { | |
2106 | int ret; | |
2107 | unsigned int nb_fd = 0; | |
2108 | struct consumer_socket *socket; | |
2109 | ||
2110 | assert(usess); | |
2111 | assert(ua_sess); | |
2112 | assert(ua_chan); | |
2113 | assert(registry); | |
2114 | ||
2115 | rcu_read_lock(); | |
2116 | health_code_update(); | |
2117 | ||
2118 | /* Get the right consumer socket for the application. */ | |
2119 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
2120 | if (!socket) { | |
2121 | ret = -EINVAL; | |
2122 | goto error; | |
2123 | } | |
2124 | ||
2125 | health_code_update(); | |
2126 | ||
2127 | /* Need one fd for the channel. */ | |
2128 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2129 | if (ret < 0) { | |
2130 | ERR("Exhausted number of available FD upon create channel"); | |
2131 | goto error; | |
2132 | } | |
2133 | ||
2134 | /* | |
2135 | * Ask consumer to create channel. The consumer will return the number of | |
2136 | * stream we have to expect. | |
2137 | */ | |
2138 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
2139 | registry); | |
2140 | if (ret < 0) { | |
2141 | goto error_ask; | |
2142 | } | |
2143 | ||
2144 | /* | |
2145 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2146 | * stream (2 being the default value here). | |
2147 | */ | |
2148 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2149 | ||
2150 | /* Reserve the amount of file descriptor we need. */ | |
2151 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2152 | if (ret < 0) { | |
2153 | ERR("Exhausted number of available FD upon create channel"); | |
2154 | goto error_fd_get_stream; | |
2155 | } | |
2156 | ||
2157 | health_code_update(); | |
2158 | ||
2159 | /* | |
2160 | * Now get the channel from the consumer. This call wil populate the stream | |
2161 | * list of that channel and set the ust objects. | |
2162 | */ | |
d9078d0c DG |
2163 | if (usess->consumer->enabled) { |
2164 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2165 | if (ret < 0) { | |
2166 | goto error_destroy; | |
2167 | } | |
7972aab2 DG |
2168 | } |
2169 | ||
2170 | rcu_read_unlock(); | |
2171 | return 0; | |
2172 | ||
2173 | error_destroy: | |
2174 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2175 | error_fd_get_stream: | |
2176 | /* | |
2177 | * Initiate a destroy channel on the consumer since we had an error | |
2178 | * handling it on our side. The return value is of no importance since we | |
2179 | * already have a ret value set by the previous error that we need to | |
2180 | * return. | |
2181 | */ | |
2182 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2183 | error_ask: | |
2184 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2185 | error: | |
2186 | health_code_update(); | |
2187 | rcu_read_unlock(); | |
2188 | return ret; | |
2189 | } | |
2190 | ||
2191 | /* | |
2192 | * Duplicate the ust data object of the ust app stream and save it in the | |
2193 | * buffer registry stream. | |
2194 | * | |
2195 | * Return 0 on success or else a negative value. | |
2196 | */ | |
2197 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2198 | struct ust_app_stream *stream) | |
2199 | { | |
2200 | int ret; | |
2201 | ||
2202 | assert(reg_stream); | |
2203 | assert(stream); | |
2204 | ||
2205 | /* Reserve the amount of file descriptor we need. */ | |
2206 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2207 | if (ret < 0) { | |
2208 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2209 | goto error; | |
2210 | } | |
2211 | ||
2212 | /* Duplicate object for stream once the original is in the registry. */ | |
2213 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2214 | reg_stream->obj.ust); | |
2215 | if (ret < 0) { | |
2216 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2217 | reg_stream->obj.ust, stream->obj, ret); | |
2218 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2219 | goto error; | |
2220 | } | |
2221 | stream->handle = stream->obj->handle; | |
2222 | ||
2223 | error: | |
2224 | return ret; | |
2225 | } | |
2226 | ||
2227 | /* | |
2228 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2229 | * buffer registry channel. | |
2230 | * | |
2231 | * Return 0 on success or else a negative value. | |
2232 | */ | |
2233 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2234 | struct ust_app_channel *ua_chan) | |
2235 | { | |
2236 | int ret; | |
2237 | ||
2238 | assert(reg_chan); | |
2239 | assert(ua_chan); | |
2240 | ||
2241 | /* Need two fds for the channel. */ | |
2242 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2243 | if (ret < 0) { | |
2244 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2245 | goto error_fd_get; | |
2246 | } | |
2247 | ||
2248 | /* Duplicate object for stream once the original is in the registry. */ | |
2249 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2250 | if (ret < 0) { | |
2251 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2252 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2253 | goto error; | |
2254 | } | |
2255 | ua_chan->handle = ua_chan->obj->handle; | |
2256 | ||
2257 | return 0; | |
2258 | ||
2259 | error: | |
2260 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2261 | error_fd_get: | |
2262 | return ret; | |
2263 | } | |
2264 | ||
2265 | /* | |
2266 | * For a given channel buffer registry, setup all streams of the given ust | |
2267 | * application channel. | |
2268 | * | |
2269 | * Return 0 on success or else a negative value. | |
2270 | */ | |
2271 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
2272 | struct ust_app_channel *ua_chan) | |
2273 | { | |
2274 | int ret = 0; | |
2275 | struct ust_app_stream *stream, *stmp; | |
2276 | ||
2277 | assert(reg_chan); | |
2278 | assert(ua_chan); | |
2279 | ||
2280 | DBG2("UST app setup buffer registry stream"); | |
2281 | ||
2282 | /* Send all streams to application. */ | |
2283 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2284 | struct buffer_reg_stream *reg_stream; | |
2285 | ||
2286 | ret = buffer_reg_stream_create(®_stream); | |
2287 | if (ret < 0) { | |
2288 | goto error; | |
2289 | } | |
2290 | ||
2291 | /* | |
2292 | * Keep original pointer and nullify it in the stream so the delete | |
2293 | * stream call does not release the object. | |
2294 | */ | |
2295 | reg_stream->obj.ust = stream->obj; | |
2296 | stream->obj = NULL; | |
2297 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2298 | |
7972aab2 DG |
2299 | /* We don't need the streams anymore. */ |
2300 | cds_list_del(&stream->list); | |
2301 | delete_ust_app_stream(-1, stream); | |
2302 | } | |
421cb601 | 2303 | |
7972aab2 DG |
2304 | error: |
2305 | return ret; | |
2306 | } | |
2307 | ||
2308 | /* | |
2309 | * Create a buffer registry channel for the given session registry and | |
2310 | * application channel object. If regp pointer is valid, it's set with the | |
2311 | * created object. Important, the created object is NOT added to the session | |
2312 | * registry hash table. | |
2313 | * | |
2314 | * Return 0 on success else a negative value. | |
2315 | */ | |
2316 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2317 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2318 | { | |
2319 | int ret; | |
2320 | struct buffer_reg_channel *reg_chan = NULL; | |
2321 | ||
2322 | assert(reg_sess); | |
2323 | assert(ua_chan); | |
2324 | ||
2325 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2326 | ||
2327 | /* Create buffer registry channel. */ | |
2328 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2329 | if (ret < 0) { | |
2330 | goto error_create; | |
421cb601 | 2331 | } |
7972aab2 DG |
2332 | assert(reg_chan); |
2333 | reg_chan->consumer_key = ua_chan->key; | |
8c924c7b | 2334 | reg_chan->subbuf_size = ua_chan->attr.subbuf_size; |
421cb601 | 2335 | |
7972aab2 DG |
2336 | /* Create and add a channel registry to session. */ |
2337 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2338 | ua_chan->tracing_channel_id); | |
2339 | if (ret < 0) { | |
2340 | goto error; | |
d88aee68 | 2341 | } |
7972aab2 | 2342 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2343 | |
7972aab2 DG |
2344 | if (regp) { |
2345 | *regp = reg_chan; | |
3d8ca23b | 2346 | } |
d88aee68 | 2347 | |
7972aab2 | 2348 | return 0; |
3d8ca23b DG |
2349 | |
2350 | error: | |
7972aab2 DG |
2351 | /* Safe because the registry channel object was not added to any HT. */ |
2352 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2353 | error_create: | |
3d8ca23b | 2354 | return ret; |
421cb601 DG |
2355 | } |
2356 | ||
55cc08a6 | 2357 | /* |
7972aab2 DG |
2358 | * Setup buffer registry channel for the given session registry and application |
2359 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2360 | * |
7972aab2 | 2361 | * Return 0 on success else a negative value. |
55cc08a6 | 2362 | */ |
7972aab2 DG |
2363 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
2364 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan) | |
55cc08a6 | 2365 | { |
7972aab2 | 2366 | int ret; |
55cc08a6 | 2367 | |
7972aab2 DG |
2368 | assert(reg_sess); |
2369 | assert(reg_chan); | |
2370 | assert(ua_chan); | |
2371 | assert(ua_chan->obj); | |
55cc08a6 | 2372 | |
7972aab2 | 2373 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2374 | |
7972aab2 DG |
2375 | /* Setup all streams for the registry. */ |
2376 | ret = setup_buffer_reg_streams(reg_chan, ua_chan); | |
2377 | if (ret < 0) { | |
55cc08a6 DG |
2378 | goto error; |
2379 | } | |
2380 | ||
7972aab2 DG |
2381 | reg_chan->obj.ust = ua_chan->obj; |
2382 | ua_chan->obj = NULL; | |
55cc08a6 | 2383 | |
7972aab2 | 2384 | return 0; |
55cc08a6 DG |
2385 | |
2386 | error: | |
7972aab2 DG |
2387 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2388 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2389 | return ret; |
2390 | } | |
2391 | ||
edb67388 | 2392 | /* |
7972aab2 | 2393 | * Send buffer registry channel to the application. |
d0b96690 | 2394 | * |
7972aab2 | 2395 | * Return 0 on success else a negative value. |
edb67388 | 2396 | */ |
7972aab2 DG |
2397 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2398 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2399 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2400 | { |
2401 | int ret; | |
7972aab2 | 2402 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2403 | |
7972aab2 DG |
2404 | assert(reg_chan); |
2405 | assert(app); | |
2406 | assert(ua_sess); | |
2407 | assert(ua_chan); | |
2408 | ||
2409 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2410 | ||
2411 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2412 | if (ret < 0) { |
2413 | goto error; | |
2414 | } | |
2415 | ||
7972aab2 DG |
2416 | /* Send channel to the application. */ |
2417 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
2418 | if (ret < 0) { | |
2419 | goto error; | |
2420 | } | |
2421 | ||
2422 | health_code_update(); | |
2423 | ||
2424 | /* Send all streams to application. */ | |
2425 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2426 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2427 | struct ust_app_stream stream; | |
2428 | ||
2429 | ret = duplicate_stream_object(reg_stream, &stream); | |
2430 | if (ret < 0) { | |
2431 | goto error_stream_unlock; | |
2432 | } | |
2433 | ||
2434 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2435 | if (ret < 0) { | |
8c067051 | 2436 | (void) release_ust_app_stream(-1, &stream); |
7972aab2 DG |
2437 | goto error_stream_unlock; |
2438 | } | |
edb67388 | 2439 | |
7972aab2 DG |
2440 | /* |
2441 | * The return value is not important here. This function will output an | |
2442 | * error if needed. | |
2443 | */ | |
2444 | (void) release_ust_app_stream(-1, &stream); | |
2445 | } | |
2446 | ua_chan->is_sent = 1; | |
2447 | ||
2448 | error_stream_unlock: | |
2449 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2450 | error: |
2451 | return ret; | |
2452 | } | |
2453 | ||
9730260e | 2454 | /* |
7972aab2 DG |
2455 | * Create and send to the application the created buffers with per UID buffers. |
2456 | * | |
2457 | * Return 0 on success else a negative value. | |
9730260e | 2458 | */ |
7972aab2 DG |
2459 | static int create_channel_per_uid(struct ust_app *app, |
2460 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2461 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2462 | { |
2463 | int ret; | |
7972aab2 DG |
2464 | struct buffer_reg_uid *reg_uid; |
2465 | struct buffer_reg_channel *reg_chan; | |
9730260e | 2466 | |
7972aab2 DG |
2467 | assert(app); |
2468 | assert(usess); | |
2469 | assert(ua_sess); | |
2470 | assert(ua_chan); | |
2471 | ||
2472 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2473 | ||
2474 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2475 | /* | |
2476 | * The session creation handles the creation of this global registry | |
2477 | * object. If none can be find, there is a code flow problem or a | |
2478 | * teardown race. | |
2479 | */ | |
2480 | assert(reg_uid); | |
2481 | ||
2482 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2483 | reg_uid); | |
2484 | if (!reg_chan) { | |
2485 | /* Create the buffer registry channel object. */ | |
2486 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2487 | if (ret < 0) { | |
2488 | goto error; | |
2489 | } | |
2490 | assert(reg_chan); | |
2491 | ||
2492 | /* | |
2493 | * Create the buffers on the consumer side. This call populates the | |
2494 | * ust app channel object with all streams and data object. | |
2495 | */ | |
2496 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2497 | app->bits_per_long, reg_uid->registry->reg.ust); | |
2498 | if (ret < 0) { | |
07d2ae95 DG |
2499 | /* |
2500 | * Let's remove the previously created buffer registry channel so | |
2501 | * it's not visible anymore in the session registry. | |
2502 | */ | |
2503 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, | |
2504 | ua_chan->tracing_channel_id); | |
2505 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
2506 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
7972aab2 DG |
2507 | goto error; |
2508 | } | |
2509 | ||
2510 | /* | |
2511 | * Setup the streams and add it to the session registry. | |
2512 | */ | |
2513 | ret = setup_buffer_reg_channel(reg_uid->registry, ua_chan, reg_chan); | |
2514 | if (ret < 0) { | |
2515 | goto error; | |
2516 | } | |
2517 | ||
2518 | } | |
2519 | ||
2520 | /* Send buffers to the application. */ | |
2521 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
9730260e DG |
2522 | if (ret < 0) { |
2523 | goto error; | |
2524 | } | |
2525 | ||
9730260e DG |
2526 | error: |
2527 | return ret; | |
2528 | } | |
2529 | ||
78f0bacd | 2530 | /* |
7972aab2 DG |
2531 | * Create and send to the application the created buffers with per PID buffers. |
2532 | * | |
2533 | * Return 0 on success else a negative value. | |
78f0bacd | 2534 | */ |
7972aab2 DG |
2535 | static int create_channel_per_pid(struct ust_app *app, |
2536 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2537 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2538 | { |
8535a6d9 | 2539 | int ret; |
7972aab2 | 2540 | struct ust_registry_session *registry; |
78f0bacd | 2541 | |
7972aab2 DG |
2542 | assert(app); |
2543 | assert(usess); | |
2544 | assert(ua_sess); | |
2545 | assert(ua_chan); | |
2546 | ||
2547 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2548 | ||
2549 | rcu_read_lock(); | |
2550 | ||
2551 | registry = get_session_registry(ua_sess); | |
2552 | assert(registry); | |
2553 | ||
2554 | /* Create and add a new channel registry to session. */ | |
2555 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd DG |
2556 | if (ret < 0) { |
2557 | goto error; | |
2558 | } | |
2559 | ||
7972aab2 DG |
2560 | /* Create and get channel on the consumer side. */ |
2561 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2562 | app->bits_per_long, registry); | |
2563 | if (ret < 0) { | |
2564 | goto error; | |
2565 | } | |
2566 | ||
2567 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
2568 | if (ret < 0) { | |
2569 | goto error; | |
2570 | } | |
8535a6d9 | 2571 | |
78f0bacd | 2572 | error: |
7972aab2 | 2573 | rcu_read_unlock(); |
78f0bacd DG |
2574 | return ret; |
2575 | } | |
2576 | ||
2577 | /* | |
7972aab2 DG |
2578 | * From an already allocated ust app channel, create the channel buffers if |
2579 | * need and send it to the application. This MUST be called with a RCU read | |
2580 | * side lock acquired. | |
2581 | * | |
2582 | * Return 0 on success or else a negative value. | |
78f0bacd | 2583 | */ |
7972aab2 DG |
2584 | static int do_create_channel(struct ust_app *app, |
2585 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2586 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2587 | { |
7972aab2 | 2588 | int ret; |
78f0bacd | 2589 | |
7972aab2 DG |
2590 | assert(app); |
2591 | assert(usess); | |
2592 | assert(ua_sess); | |
2593 | assert(ua_chan); | |
2594 | ||
2595 | /* Handle buffer type before sending the channel to the application. */ | |
2596 | switch (usess->buffer_type) { | |
2597 | case LTTNG_BUFFER_PER_UID: | |
2598 | { | |
2599 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
2600 | if (ret < 0) { | |
2601 | goto error; | |
2602 | } | |
2603 | break; | |
2604 | } | |
2605 | case LTTNG_BUFFER_PER_PID: | |
2606 | { | |
2607 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
2608 | if (ret < 0) { | |
2609 | goto error; | |
2610 | } | |
2611 | break; | |
2612 | } | |
2613 | default: | |
2614 | assert(0); | |
2615 | ret = -EINVAL; | |
78f0bacd DG |
2616 | goto error; |
2617 | } | |
2618 | ||
7972aab2 DG |
2619 | /* Initialize ust objd object using the received handle and add it. */ |
2620 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
2621 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 2622 | |
7972aab2 DG |
2623 | /* If channel is not enabled, disable it on the tracer */ |
2624 | if (!ua_chan->enabled) { | |
2625 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2626 | if (ret < 0) { | |
2627 | goto error; | |
2628 | } | |
78f0bacd DG |
2629 | } |
2630 | ||
2631 | error: | |
2632 | return ret; | |
2633 | } | |
2634 | ||
284d8f55 | 2635 | /* |
4d710ac2 DG |
2636 | * Create UST app channel and create it on the tracer. Set ua_chanp of the |
2637 | * newly created channel if not NULL. | |
d0b96690 | 2638 | * |
36b588ed | 2639 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 DG |
2640 | * |
2641 | * Return 0 on success or else a negative value. | |
284d8f55 | 2642 | */ |
4d710ac2 DG |
2643 | static int create_ust_app_channel(struct ust_app_session *ua_sess, |
2644 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
7972aab2 | 2645 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 2646 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
2647 | { |
2648 | int ret = 0; | |
bec39940 DG |
2649 | struct lttng_ht_iter iter; |
2650 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
2651 | struct ust_app_channel *ua_chan; |
2652 | ||
2653 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
2654 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
2655 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 2656 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 2657 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 2658 | goto end; |
5b4a0ec0 DG |
2659 | } |
2660 | ||
d0b96690 | 2661 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
2662 | if (ua_chan == NULL) { |
2663 | /* Only malloc can fail here */ | |
4d710ac2 | 2664 | ret = -ENOMEM; |
094d1690 | 2665 | goto error_alloc; |
fc34caaa DG |
2666 | } |
2667 | shadow_copy_channel(ua_chan, uchan); | |
2668 | ||
ffe60014 DG |
2669 | /* Set channel type. */ |
2670 | ua_chan->attr.type = type; | |
2671 | ||
7972aab2 | 2672 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
5b4a0ec0 DG |
2673 | if (ret < 0) { |
2674 | goto error; | |
2675 | } | |
2676 | ||
fc34caaa | 2677 | DBG2("UST app create channel %s for PID %d completed", ua_chan->name, |
852d0037 | 2678 | app->pid); |
fc34caaa | 2679 | |
d0b96690 DG |
2680 | /* Only add the channel if successful on the tracer side. */ |
2681 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
2682 | ||
fc34caaa | 2683 | end: |
4d710ac2 DG |
2684 | if (ua_chanp) { |
2685 | *ua_chanp = ua_chan; | |
2686 | } | |
2687 | ||
2688 | /* Everything went well. */ | |
2689 | return 0; | |
5b4a0ec0 DG |
2690 | |
2691 | error: | |
d0b96690 | 2692 | delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app); |
094d1690 | 2693 | error_alloc: |
4d710ac2 | 2694 | return ret; |
5b4a0ec0 DG |
2695 | } |
2696 | ||
2697 | /* | |
2698 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
2699 | * |
2700 | * Called with ust app session mutex held. | |
5b4a0ec0 | 2701 | */ |
edb67388 DG |
2702 | static |
2703 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
2704 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
2705 | struct ust_app *app) | |
284d8f55 | 2706 | { |
edb67388 | 2707 | int ret = 0; |
5b4a0ec0 | 2708 | struct ust_app_event *ua_event; |
284d8f55 | 2709 | |
5b4a0ec0 | 2710 | /* Get event node */ |
18eace3b | 2711 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 2712 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 2713 | if (ua_event != NULL) { |
fc34caaa | 2714 | ret = -EEXIST; |
edb67388 DG |
2715 | goto end; |
2716 | } | |
5b4a0ec0 | 2717 | |
edb67388 DG |
2718 | /* Does not exist so create one */ |
2719 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); | |
2720 | if (ua_event == NULL) { | |
2721 | /* Only malloc can failed so something is really wrong */ | |
2722 | ret = -ENOMEM; | |
fc34caaa | 2723 | goto end; |
5b4a0ec0 | 2724 | } |
edb67388 | 2725 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 2726 | |
edb67388 | 2727 | /* Create it on the tracer side */ |
5b4a0ec0 | 2728 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 2729 | if (ret < 0) { |
fc34caaa | 2730 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 2731 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
2732 | goto error; |
2733 | } | |
2734 | ||
d0b96690 | 2735 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 2736 | |
fc34caaa | 2737 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 2738 | app->pid); |
7f79d3a1 | 2739 | |
edb67388 | 2740 | end: |
fc34caaa DG |
2741 | return ret; |
2742 | ||
5b4a0ec0 | 2743 | error: |
fc34caaa DG |
2744 | /* Valid. Calling here is already in a read side lock */ |
2745 | delete_ust_app_event(-1, ua_event); | |
edb67388 | 2746 | return ret; |
5b4a0ec0 DG |
2747 | } |
2748 | ||
2749 | /* | |
2750 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 2751 | * |
7972aab2 | 2752 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
2753 | */ |
2754 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
ce4846f7 | 2755 | struct ust_app *app, struct consumer_output *consumer) |
5b4a0ec0 DG |
2756 | { |
2757 | int ret = 0; | |
ffe60014 | 2758 | struct ust_app_channel *metadata; |
d88aee68 | 2759 | struct consumer_socket *socket; |
7972aab2 | 2760 | struct ust_registry_session *registry; |
5b4a0ec0 | 2761 | |
ffe60014 DG |
2762 | assert(ua_sess); |
2763 | assert(app); | |
d88aee68 | 2764 | assert(consumer); |
5b4a0ec0 | 2765 | |
7972aab2 DG |
2766 | registry = get_session_registry(ua_sess); |
2767 | assert(registry); | |
2768 | ||
008b9675 MD |
2769 | pthread_mutex_lock(®istry->lock); |
2770 | ||
1b532a60 DG |
2771 | /* Metadata already exists for this registry or it was closed previously */ |
2772 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
2773 | ret = 0; |
2774 | goto error; | |
5b4a0ec0 DG |
2775 | } |
2776 | ||
ffe60014 | 2777 | /* Allocate UST metadata */ |
d0b96690 | 2778 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
2779 | if (!metadata) { |
2780 | /* malloc() failed */ | |
2781 | ret = -ENOMEM; | |
2782 | goto error; | |
2783 | } | |
5b4a0ec0 | 2784 | |
ce4846f7 | 2785 | memcpy(&metadata->attr, &ua_sess->metadata_attr, sizeof(metadata->attr)); |
5b4a0ec0 | 2786 | |
7972aab2 DG |
2787 | /* Need one fd for the channel. */ |
2788 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2789 | if (ret < 0) { | |
2790 | ERR("Exhausted number of available FD upon create metadata"); | |
2791 | goto error; | |
2792 | } | |
2793 | ||
4dc3dfc5 DG |
2794 | /* Get the right consumer socket for the application. */ |
2795 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
2796 | if (!socket) { | |
2797 | ret = -EINVAL; | |
2798 | goto error_consumer; | |
2799 | } | |
2800 | ||
331744e3 JD |
2801 | /* |
2802 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
2803 | * to the registry *before* we ask the consumer so we avoid the race of the | |
2804 | * consumer requesting the metadata and the ask_channel call on our side | |
2805 | * did not returned yet. | |
2806 | */ | |
2807 | registry->metadata_key = metadata->key; | |
2808 | ||
d88aee68 DG |
2809 | /* |
2810 | * Ask the metadata channel creation to the consumer. The metadata object | |
2811 | * will be created by the consumer and kept their. However, the stream is | |
2812 | * never added or monitored until we do a first push metadata to the | |
2813 | * consumer. | |
2814 | */ | |
7972aab2 DG |
2815 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
2816 | registry); | |
d88aee68 | 2817 | if (ret < 0) { |
f2a444f1 DG |
2818 | /* Nullify the metadata key so we don't try to close it later on. */ |
2819 | registry->metadata_key = 0; | |
d88aee68 DG |
2820 | goto error_consumer; |
2821 | } | |
2822 | ||
2823 | /* | |
2824 | * The setup command will make the metadata stream be sent to the relayd, | |
2825 | * if applicable, and the thread managing the metadatas. This is important | |
2826 | * because after this point, if an error occurs, the only way the stream | |
2827 | * can be deleted is to be monitored in the consumer. | |
2828 | */ | |
7972aab2 | 2829 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 2830 | if (ret < 0) { |
f2a444f1 DG |
2831 | /* Nullify the metadata key so we don't try to close it later on. */ |
2832 | registry->metadata_key = 0; | |
d88aee68 | 2833 | goto error_consumer; |
5b4a0ec0 DG |
2834 | } |
2835 | ||
7972aab2 DG |
2836 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
2837 | metadata->key, app->pid); | |
5b4a0ec0 | 2838 | |
d88aee68 | 2839 | error_consumer: |
b80f0b6c | 2840 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 2841 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 2842 | error: |
008b9675 | 2843 | pthread_mutex_unlock(®istry->lock); |
ffe60014 | 2844 | return ret; |
5b4a0ec0 DG |
2845 | } |
2846 | ||
5b4a0ec0 | 2847 | /* |
d88aee68 DG |
2848 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
2849 | * acquired before calling this function. | |
5b4a0ec0 DG |
2850 | */ |
2851 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
2852 | { | |
d88aee68 | 2853 | struct ust_app *app = NULL; |
bec39940 DG |
2854 | struct lttng_ht_node_ulong *node; |
2855 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 2856 | |
bec39940 DG |
2857 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
2858 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
2859 | if (node == NULL) { |
2860 | DBG2("UST app no found with pid %d", pid); | |
2861 | goto error; | |
2862 | } | |
5b4a0ec0 DG |
2863 | |
2864 | DBG2("Found UST app by pid %d", pid); | |
2865 | ||
d88aee68 | 2866 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
2867 | |
2868 | error: | |
d88aee68 | 2869 | return app; |
5b4a0ec0 DG |
2870 | } |
2871 | ||
d88aee68 DG |
2872 | /* |
2873 | * Allocate and init an UST app object using the registration information and | |
2874 | * the command socket. This is called when the command socket connects to the | |
2875 | * session daemon. | |
2876 | * | |
2877 | * The object is returned on success or else NULL. | |
2878 | */ | |
d0b96690 | 2879 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 2880 | { |
d0b96690 DG |
2881 | struct ust_app *lta = NULL; |
2882 | ||
2883 | assert(msg); | |
2884 | assert(sock >= 0); | |
2885 | ||
2886 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 2887 | |
173af62f DG |
2888 | if ((msg->bits_per_long == 64 && |
2889 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
2890 | || (msg->bits_per_long == 32 && | |
2891 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 2892 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
2893 | "%d-bit long, but no consumerd for this size is available.\n", |
2894 | msg->name, msg->pid, msg->bits_per_long); | |
2895 | goto error; | |
3f2c5fcc | 2896 | } |
d0b96690 | 2897 | |
5b4a0ec0 DG |
2898 | lta = zmalloc(sizeof(struct ust_app)); |
2899 | if (lta == NULL) { | |
2900 | PERROR("malloc"); | |
d0b96690 | 2901 | goto error; |
5b4a0ec0 DG |
2902 | } |
2903 | ||
2904 | lta->ppid = msg->ppid; | |
2905 | lta->uid = msg->uid; | |
2906 | lta->gid = msg->gid; | |
d0b96690 | 2907 | |
7753dea8 | 2908 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
2909 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
2910 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
2911 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
2912 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
2913 | lta->long_alignment = msg->long_alignment; | |
2914 | lta->byte_order = msg->byte_order; | |
2915 | ||
5b4a0ec0 DG |
2916 | lta->v_major = msg->major; |
2917 | lta->v_minor = msg->minor; | |
d9bf3ca4 | 2918 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 DG |
2919 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
2920 | lta->notify_sock = -1; | |
d88aee68 DG |
2921 | |
2922 | /* Copy name and make sure it's NULL terminated. */ | |
2923 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
2924 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
2925 | ||
2926 | /* | |
2927 | * Before this can be called, when receiving the registration information, | |
2928 | * the application compatibility is checked. So, at this point, the | |
2929 | * application can work with this session daemon. | |
2930 | */ | |
d0b96690 | 2931 | lta->compatible = 1; |
5b4a0ec0 | 2932 | |
852d0037 | 2933 | lta->pid = msg->pid; |
d0b96690 | 2934 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 2935 | lta->sock = sock; |
d0b96690 | 2936 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 2937 | |
d42f20df DG |
2938 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
2939 | ||
d0b96690 DG |
2940 | error: |
2941 | return lta; | |
2942 | } | |
2943 | ||
d88aee68 DG |
2944 | /* |
2945 | * For a given application object, add it to every hash table. | |
2946 | */ | |
d0b96690 DG |
2947 | void ust_app_add(struct ust_app *app) |
2948 | { | |
2949 | assert(app); | |
2950 | assert(app->notify_sock >= 0); | |
2951 | ||
5b4a0ec0 | 2952 | rcu_read_lock(); |
852d0037 DG |
2953 | |
2954 | /* | |
2955 | * On a re-registration, we want to kick out the previous registration of | |
2956 | * that pid | |
2957 | */ | |
d0b96690 | 2958 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
2959 | |
2960 | /* | |
2961 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
2962 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
2963 | * already in the table. | |
2964 | */ | |
d0b96690 | 2965 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 2966 | |
d0b96690 DG |
2967 | /* Add application to the notify socket hash table. */ |
2968 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
2969 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 2970 | |
d0b96690 | 2971 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
2972 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
2973 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
2974 | app->v_minor); | |
5b4a0ec0 | 2975 | |
d0b96690 DG |
2976 | rcu_read_unlock(); |
2977 | } | |
2978 | ||
d88aee68 DG |
2979 | /* |
2980 | * Set the application version into the object. | |
2981 | * | |
2982 | * Return 0 on success else a negative value either an errno code or a | |
2983 | * LTTng-UST error code. | |
2984 | */ | |
d0b96690 DG |
2985 | int ust_app_version(struct ust_app *app) |
2986 | { | |
d88aee68 DG |
2987 | int ret; |
2988 | ||
d0b96690 | 2989 | assert(app); |
d88aee68 DG |
2990 | |
2991 | ret = ustctl_tracer_version(app->sock, &app->version); | |
2992 | if (ret < 0) { | |
2993 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
2994 | ERR("UST app %d verson failed with ret %d", app->sock, ret); | |
2995 | } else { | |
2996 | DBG3("UST app %d verion failed. Application is dead", app->sock); | |
2997 | } | |
2998 | } | |
2999 | ||
3000 | return ret; | |
5b4a0ec0 DG |
3001 | } |
3002 | ||
3003 | /* | |
3004 | * Unregister app by removing it from the global traceable app list and freeing | |
3005 | * the data struct. | |
3006 | * | |
3007 | * The socket is already closed at this point so no close to sock. | |
3008 | */ | |
3009 | void ust_app_unregister(int sock) | |
3010 | { | |
3011 | struct ust_app *lta; | |
bec39940 | 3012 | struct lttng_ht_node_ulong *node; |
123fb9ed | 3013 | struct lttng_ht_iter ust_app_sock_iter; |
bec39940 | 3014 | struct lttng_ht_iter iter; |
d42f20df | 3015 | struct ust_app_session *ua_sess; |
525b0740 | 3016 | int ret; |
5b4a0ec0 DG |
3017 | |
3018 | rcu_read_lock(); | |
886459c6 | 3019 | |
5b4a0ec0 | 3020 | /* Get the node reference for a call_rcu */ |
123fb9ed MD |
3021 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &ust_app_sock_iter); |
3022 | node = lttng_ht_iter_get_node_ulong(&ust_app_sock_iter); | |
d0b96690 | 3023 | assert(node); |
284d8f55 | 3024 | |
852d0037 | 3025 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
3026 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
3027 | ||
d88aee68 | 3028 | /* |
008b9675 MD |
3029 | * For per-PID buffers, perform "push metadata" and flush all |
3030 | * application streams before removing app from hash tables, | |
3031 | * ensuring proper behavior of data_pending check. | |
123fb9ed | 3032 | * Remove sessions so they are not visible during deletion. |
d88aee68 | 3033 | */ |
d42f20df DG |
3034 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, |
3035 | node.node) { | |
7972aab2 DG |
3036 | struct ust_registry_session *registry; |
3037 | ||
d42f20df DG |
3038 | ret = lttng_ht_del(lta->sessions, &iter); |
3039 | if (ret) { | |
3040 | /* The session was already removed so scheduled for teardown. */ | |
3041 | continue; | |
3042 | } | |
3043 | ||
008b9675 MD |
3044 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { |
3045 | (void) ust_app_flush_app_session(lta, ua_sess); | |
3046 | } | |
123fb9ed | 3047 | |
d42f20df DG |
3048 | /* |
3049 | * Add session to list for teardown. This is safe since at this point we | |
3050 | * are the only one using this list. | |
3051 | */ | |
d88aee68 DG |
3052 | pthread_mutex_lock(&ua_sess->lock); |
3053 | ||
3054 | /* | |
3055 | * Normally, this is done in the delete session process which is | |
3056 | * executed in the call rcu below. However, upon registration we can't | |
3057 | * afford to wait for the grace period before pushing data or else the | |
3058 | * data pending feature can race between the unregistration and stop | |
3059 | * command where the data pending command is sent *before* the grace | |
3060 | * period ended. | |
3061 | * | |
3062 | * The close metadata below nullifies the metadata pointer in the | |
3063 | * session so the delete session will NOT push/close a second time. | |
3064 | */ | |
7972aab2 | 3065 | registry = get_session_registry(ua_sess); |
008b9675 | 3066 | if (registry) { |
7972aab2 DG |
3067 | /* Push metadata for application before freeing the application. */ |
3068 | (void) push_metadata(registry, ua_sess->consumer); | |
3069 | ||
3070 | /* | |
3071 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
3072 | * metadata only on destroy trace session in this case. Also, the |
3073 | * previous push metadata could have flag the metadata registry to | |
3074 | * close so don't send a close command if closed. | |
7972aab2 | 3075 | */ |
008b9675 | 3076 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
3077 | /* And ask to close it for this session registry. */ |
3078 | (void) close_metadata(registry, ua_sess->consumer); | |
3079 | } | |
3080 | } | |
d42f20df | 3081 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
123fb9ed | 3082 | |
d88aee68 | 3083 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
3084 | } |
3085 | ||
123fb9ed MD |
3086 | /* Remove application from PID hash table */ |
3087 | ret = lttng_ht_del(ust_app_ht_by_sock, &ust_app_sock_iter); | |
3088 | assert(!ret); | |
3089 | ||
3090 | /* | |
3091 | * Remove application from notify hash table. The thread handling the | |
3092 | * notify socket could have deleted the node so ignore on error because | |
3093 | * either way it's valid. The close of that socket is handled by the other | |
3094 | * thread. | |
3095 | */ | |
3096 | iter.iter.node = <a->notify_sock_n.node; | |
3097 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3098 | ||
3099 | /* | |
3100 | * Ignore return value since the node might have been removed before by an | |
3101 | * add replace during app registration because the PID can be reassigned by | |
3102 | * the OS. | |
3103 | */ | |
3104 | iter.iter.node = <a->pid_n.node; | |
3105 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3106 | if (ret) { | |
3107 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
3108 | lta->pid); | |
3109 | } | |
3110 | ||
852d0037 DG |
3111 | /* Free memory */ |
3112 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
3113 | ||
5b4a0ec0 DG |
3114 | rcu_read_unlock(); |
3115 | return; | |
284d8f55 DG |
3116 | } |
3117 | ||
5b4a0ec0 DG |
3118 | /* |
3119 | * Fill events array with all events name of all registered apps. | |
3120 | */ | |
3121 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 3122 | { |
5b4a0ec0 DG |
3123 | int ret, handle; |
3124 | size_t nbmem, count = 0; | |
bec39940 | 3125 | struct lttng_ht_iter iter; |
5b4a0ec0 | 3126 | struct ust_app *app; |
c617c0c6 | 3127 | struct lttng_event *tmp_event; |
421cb601 | 3128 | |
5b4a0ec0 | 3129 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
3130 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
3131 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
3132 | PERROR("zmalloc ust app events"); |
3133 | ret = -ENOMEM; | |
421cb601 DG |
3134 | goto error; |
3135 | } | |
3136 | ||
5b4a0ec0 | 3137 | rcu_read_lock(); |
421cb601 | 3138 | |
852d0037 | 3139 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 3140 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 3141 | |
840cb59c | 3142 | health_code_update(); |
86acf0da | 3143 | |
e0c7ec2b DG |
3144 | if (!app->compatible) { |
3145 | /* | |
3146 | * TODO: In time, we should notice the caller of this error by | |
3147 | * telling him that this is a version error. | |
3148 | */ | |
3149 | continue; | |
3150 | } | |
852d0037 | 3151 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 3152 | if (handle < 0) { |
ffe60014 DG |
3153 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3154 | ERR("UST app list events getting handle failed for app pid %d", | |
3155 | app->pid); | |
3156 | } | |
5b4a0ec0 DG |
3157 | continue; |
3158 | } | |
421cb601 | 3159 | |
852d0037 | 3160 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 3161 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3162 | /* Handle ustctl error. */ |
3163 | if (ret < 0) { | |
a2ba1ab0 | 3164 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3165 | ERR("UST app tp list get failed for app %d with ret %d", |
3166 | app->sock, ret); | |
3167 | } else { | |
3168 | DBG3("UST app tp list get failed. Application is dead"); | |
3757b385 DG |
3169 | /* |
3170 | * This is normal behavior, an application can die during the | |
3171 | * creation process. Don't report an error so the execution can | |
3172 | * continue normally. Continue normal execution. | |
3173 | */ | |
3174 | break; | |
ffe60014 | 3175 | } |
98f595d4 | 3176 | free(tmp_event); |
ffe60014 DG |
3177 | goto rcu_error; |
3178 | } | |
3179 | ||
840cb59c | 3180 | health_code_update(); |
815564d8 | 3181 | if (count >= nbmem) { |
d7b3776f | 3182 | /* In case the realloc fails, we free the memory */ |
239f3aec MD |
3183 | struct lttng_event *new_tmp_event; |
3184 | size_t new_nbmem; | |
3185 | ||
3186 | new_nbmem = nbmem << 1; | |
3187 | DBG2("Reallocating event list from %zu to %zu entries", | |
3188 | nbmem, new_nbmem); | |
3189 | new_tmp_event = realloc(tmp_event, | |
3190 | new_nbmem * sizeof(struct lttng_event)); | |
3191 | if (new_tmp_event == NULL) { | |
5b4a0ec0 | 3192 | PERROR("realloc ust app events"); |
c617c0c6 | 3193 | free(tmp_event); |
5b4a0ec0 DG |
3194 | ret = -ENOMEM; |
3195 | goto rcu_error; | |
3196 | } | |
239f3aec MD |
3197 | /* Zero the new memory */ |
3198 | memset(new_tmp_event + nbmem, 0, | |
3199 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
3200 | nbmem = new_nbmem; | |
3201 | tmp_event = new_tmp_event; | |
5b4a0ec0 | 3202 | } |
c617c0c6 MD |
3203 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
3204 | tmp_event[count].loglevel = uiter.loglevel; | |
3205 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
3206 | tmp_event[count].pid = app->pid; | |
3207 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 3208 | count++; |
421cb601 | 3209 | } |
421cb601 DG |
3210 | } |
3211 | ||
5b4a0ec0 | 3212 | ret = count; |
c617c0c6 | 3213 | *events = tmp_event; |
421cb601 | 3214 | |
5b4a0ec0 | 3215 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 3216 | |
5b4a0ec0 DG |
3217 | rcu_error: |
3218 | rcu_read_unlock(); | |
421cb601 | 3219 | error: |
840cb59c | 3220 | health_code_update(); |
5b4a0ec0 | 3221 | return ret; |
421cb601 DG |
3222 | } |
3223 | ||
f37d259d MD |
3224 | /* |
3225 | * Fill events array with all events name of all registered apps. | |
3226 | */ | |
3227 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
3228 | { | |
3229 | int ret, handle; | |
3230 | size_t nbmem, count = 0; | |
3231 | struct lttng_ht_iter iter; | |
3232 | struct ust_app *app; | |
c617c0c6 | 3233 | struct lttng_event_field *tmp_event; |
f37d259d MD |
3234 | |
3235 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
3236 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
3237 | if (tmp_event == NULL) { | |
f37d259d MD |
3238 | PERROR("zmalloc ust app event fields"); |
3239 | ret = -ENOMEM; | |
3240 | goto error; | |
3241 | } | |
3242 | ||
3243 | rcu_read_lock(); | |
3244 | ||
3245 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3246 | struct lttng_ust_field_iter uiter; | |
3247 | ||
840cb59c | 3248 | health_code_update(); |
86acf0da | 3249 | |
f37d259d MD |
3250 | if (!app->compatible) { |
3251 | /* | |
3252 | * TODO: In time, we should notice the caller of this error by | |
3253 | * telling him that this is a version error. | |
3254 | */ | |
3255 | continue; | |
3256 | } | |
3257 | handle = ustctl_tracepoint_field_list(app->sock); | |
3258 | if (handle < 0) { | |
ffe60014 DG |
3259 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3260 | ERR("UST app list field getting handle failed for app pid %d", | |
3261 | app->pid); | |
3262 | } | |
f37d259d MD |
3263 | continue; |
3264 | } | |
3265 | ||
3266 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 3267 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3268 | /* Handle ustctl error. */ |
3269 | if (ret < 0) { | |
a2ba1ab0 | 3270 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3271 | ERR("UST app tp list field failed for app %d with ret %d", |
3272 | app->sock, ret); | |
3273 | } else { | |
3274 | DBG3("UST app tp list field failed. Application is dead"); | |
3757b385 DG |
3275 | /* |
3276 | * This is normal behavior, an application can die during the | |
3277 | * creation process. Don't report an error so the execution can | |
98f595d4 | 3278 | * continue normally. Reset list and count for next app. |
3757b385 DG |
3279 | */ |
3280 | break; | |
ffe60014 | 3281 | } |
98f595d4 | 3282 | free(tmp_event); |
ffe60014 DG |
3283 | goto rcu_error; |
3284 | } | |
3285 | ||
840cb59c | 3286 | health_code_update(); |
f37d259d | 3287 | if (count >= nbmem) { |
d7b3776f | 3288 | /* In case the realloc fails, we free the memory */ |
239f3aec MD |
3289 | struct lttng_event_field *new_tmp_event; |
3290 | size_t new_nbmem; | |
3291 | ||
3292 | new_nbmem = nbmem << 1; | |
3293 | DBG2("Reallocating event field list from %zu to %zu entries", | |
3294 | nbmem, new_nbmem); | |
3295 | new_tmp_event = realloc(tmp_event, | |
3296 | new_nbmem * sizeof(struct lttng_event_field)); | |
3297 | if (new_tmp_event == NULL) { | |
f37d259d | 3298 | PERROR("realloc ust app event fields"); |
c617c0c6 | 3299 | free(tmp_event); |
f37d259d MD |
3300 | ret = -ENOMEM; |
3301 | goto rcu_error; | |
3302 | } | |
239f3aec MD |
3303 | /* Zero the new memory */ |
3304 | memset(new_tmp_event + nbmem, 0, | |
3305 | (new_nbmem - nbmem) * sizeof(struct lttng_event_field)); | |
3306 | nbmem = new_nbmem; | |
3307 | tmp_event = new_tmp_event; | |
f37d259d | 3308 | } |
f37d259d | 3309 | |
c617c0c6 | 3310 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
2e84128e DG |
3311 | /* Mapping between these enums matches 1 to 1. */ |
3312 | tmp_event[count].type = (enum lttng_event_field_type) uiter.type; | |
c617c0c6 | 3313 | tmp_event[count].nowrite = uiter.nowrite; |
f37d259d | 3314 | |
c617c0c6 MD |
3315 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
3316 | tmp_event[count].event.loglevel = uiter.loglevel; | |
2e84128e | 3317 | tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; |
c617c0c6 MD |
3318 | tmp_event[count].event.pid = app->pid; |
3319 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
3320 | count++; |
3321 | } | |
3322 | } | |
3323 | ||
3324 | ret = count; | |
c617c0c6 | 3325 | *fields = tmp_event; |
f37d259d MD |
3326 | |
3327 | DBG2("UST app list event fields done (%zu events)", count); | |
3328 | ||
3329 | rcu_error: | |
3330 | rcu_read_unlock(); | |
3331 | error: | |
840cb59c | 3332 | health_code_update(); |
f37d259d MD |
3333 | return ret; |
3334 | } | |
3335 | ||
5b4a0ec0 DG |
3336 | /* |
3337 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
3338 | * |
3339 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
3340 | */ |
3341 | void ust_app_clean_list(void) | |
421cb601 | 3342 | { |
5b4a0ec0 | 3343 | int ret; |
659ed79f | 3344 | struct ust_app *app; |
bec39940 | 3345 | struct lttng_ht_iter iter; |
421cb601 | 3346 | |
5b4a0ec0 | 3347 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3348 | |
5b4a0ec0 | 3349 | rcu_read_lock(); |
421cb601 | 3350 | |
659ed79f | 3351 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3352 | ret = lttng_ht_del(ust_app_ht, &iter); |
525b0740 | 3353 | assert(!ret); |
659ed79f | 3354 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); |
421cb601 DG |
3355 | } |
3356 | ||
852d0037 | 3357 | /* Cleanup socket hash table */ |
659ed79f DG |
3358 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, |
3359 | sock_n.node) { | |
852d0037 | 3360 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
bec39940 DG |
3361 | assert(!ret); |
3362 | } | |
852d0037 | 3363 | |
d88aee68 DG |
3364 | /* Cleanup notify socket hash table */ |
3365 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3366 | notify_sock_n.node) { | |
3367 | ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3368 | assert(!ret); | |
3369 | } | |
36b588ed | 3370 | rcu_read_unlock(); |
d88aee68 | 3371 | |
bec39940 | 3372 | /* Destroy is done only when the ht is empty */ |
0b2dc8df MD |
3373 | ht_cleanup_push(ust_app_ht); |
3374 | ht_cleanup_push(ust_app_ht_by_sock); | |
3375 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
5b4a0ec0 DG |
3376 | } |
3377 | ||
3378 | /* | |
3379 | * Init UST app hash table. | |
3380 | */ | |
3381 | void ust_app_ht_alloc(void) | |
3382 | { | |
bec39940 | 3383 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
852d0037 | 3384 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3385 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
421cb601 DG |
3386 | } |
3387 | ||
78f0bacd DG |
3388 | /* |
3389 | * For a specific UST session, disable the channel for all registered apps. | |
3390 | */ | |
35a9059d | 3391 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3392 | struct ltt_ust_channel *uchan) |
3393 | { | |
3394 | int ret = 0; | |
bec39940 DG |
3395 | struct lttng_ht_iter iter; |
3396 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3397 | struct ust_app *app; |
3398 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3399 | struct ust_app_channel *ua_chan; |
78f0bacd DG |
3400 | |
3401 | if (usess == NULL || uchan == NULL) { | |
3402 | ERR("Disabling UST global channel with NULL values"); | |
3403 | ret = -1; | |
3404 | goto error; | |
3405 | } | |
3406 | ||
d9bf3ca4 | 3407 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 3408 | uchan->name, usess->id); |
78f0bacd DG |
3409 | |
3410 | rcu_read_lock(); | |
3411 | ||
3412 | /* For every registered applications */ | |
852d0037 | 3413 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3414 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3415 | if (!app->compatible) { |
3416 | /* | |
3417 | * TODO: In time, we should notice the caller of this error by | |
3418 | * telling him that this is a version error. | |
3419 | */ | |
3420 | continue; | |
3421 | } | |
78f0bacd DG |
3422 | ua_sess = lookup_session_by_app(usess, app); |
3423 | if (ua_sess == NULL) { | |
3424 | continue; | |
3425 | } | |
3426 | ||
8535a6d9 | 3427 | /* Get channel */ |
bec39940 DG |
3428 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3429 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
3430 | /* If the session if found for the app, the channel must be there */ |
3431 | assert(ua_chan_node); | |
3432 | ||
3433 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3434 | /* The channel must not be already disabled */ | |
3435 | assert(ua_chan->enabled == 1); | |
3436 | ||
3437 | /* Disable channel onto application */ | |
3438 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
3439 | if (ret < 0) { |
3440 | /* XXX: We might want to report this error at some point... */ | |
3441 | continue; | |
3442 | } | |
3443 | } | |
3444 | ||
3445 | rcu_read_unlock(); | |
3446 | ||
3447 | error: | |
3448 | return ret; | |
3449 | } | |
3450 | ||
3451 | /* | |
3452 | * For a specific UST session, enable the channel for all registered apps. | |
3453 | */ | |
35a9059d | 3454 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3455 | struct ltt_ust_channel *uchan) |
3456 | { | |
3457 | int ret = 0; | |
bec39940 | 3458 | struct lttng_ht_iter iter; |
78f0bacd DG |
3459 | struct ust_app *app; |
3460 | struct ust_app_session *ua_sess; | |
3461 | ||
3462 | if (usess == NULL || uchan == NULL) { | |
3463 | ERR("Adding UST global channel to NULL values"); | |
3464 | ret = -1; | |
3465 | goto error; | |
3466 | } | |
3467 | ||
d9bf3ca4 | 3468 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 3469 | uchan->name, usess->id); |
78f0bacd DG |
3470 | |
3471 | rcu_read_lock(); | |
3472 | ||
3473 | /* For every registered applications */ | |
852d0037 | 3474 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3475 | if (!app->compatible) { |
3476 | /* | |
3477 | * TODO: In time, we should notice the caller of this error by | |
3478 | * telling him that this is a version error. | |
3479 | */ | |
3480 | continue; | |
3481 | } | |
78f0bacd DG |
3482 | ua_sess = lookup_session_by_app(usess, app); |
3483 | if (ua_sess == NULL) { | |
3484 | continue; | |
3485 | } | |
3486 | ||
3487 | /* Enable channel onto application */ | |
3488 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
3489 | if (ret < 0) { | |
3490 | /* XXX: We might want to report this error at some point... */ | |
3491 | continue; | |
3492 | } | |
3493 | } | |
3494 | ||
3495 | rcu_read_unlock(); | |
3496 | ||
3497 | error: | |
3498 | return ret; | |
3499 | } | |
3500 | ||
b0a40d28 DG |
3501 | /* |
3502 | * Disable an event in a channel and for a specific session. | |
3503 | */ | |
35a9059d DG |
3504 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
3505 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
3506 | { |
3507 | int ret = 0; | |
bec39940 DG |
3508 | struct lttng_ht_iter iter, uiter; |
3509 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
b0a40d28 DG |
3510 | struct ust_app *app; |
3511 | struct ust_app_session *ua_sess; | |
3512 | struct ust_app_channel *ua_chan; | |
3513 | struct ust_app_event *ua_event; | |
3514 | ||
3515 | DBG("UST app disabling event %s for all apps in channel " | |
d9bf3ca4 MD |
3516 | "%s for session id %" PRIu64, |
3517 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
3518 | |
3519 | rcu_read_lock(); | |
3520 | ||
3521 | /* For all registered applications */ | |
852d0037 | 3522 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3523 | if (!app->compatible) { |
3524 | /* | |
3525 | * TODO: In time, we should notice the caller of this error by | |
3526 | * telling him that this is a version error. | |
3527 | */ | |
3528 | continue; | |
3529 | } | |
b0a40d28 DG |
3530 | ua_sess = lookup_session_by_app(usess, app); |
3531 | if (ua_sess == NULL) { | |
3532 | /* Next app */ | |
3533 | continue; | |
3534 | } | |
3535 | ||
3536 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3537 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3538 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 3539 | if (ua_chan_node == NULL) { |
d9bf3ca4 | 3540 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 3541 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
3542 | continue; |
3543 | } | |
3544 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3545 | ||
bec39940 DG |
3546 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter); |
3547 | ua_event_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 DG |
3548 | if (ua_event_node == NULL) { |
3549 | DBG2("Event %s not found in channel %s for app pid %d." | |
852d0037 | 3550 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
3551 | continue; |
3552 | } | |
3553 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
3554 | ||
7f79d3a1 | 3555 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
3556 | if (ret < 0) { |
3557 | /* XXX: Report error someday... */ | |
3558 | continue; | |
3559 | } | |
3560 | } | |
3561 | ||
3562 | rcu_read_unlock(); | |
3563 | ||
3564 | return ret; | |
3565 | } | |
3566 | ||
421cb601 | 3567 | /* |
5b4a0ec0 | 3568 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 3569 | */ |
35a9059d | 3570 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3571 | struct ltt_ust_channel *uchan) |
3572 | { | |
3d8ca23b | 3573 | int ret = 0, created; |
bec39940 | 3574 | struct lttng_ht_iter iter; |
48842b30 | 3575 | struct ust_app *app; |
3d8ca23b | 3576 | struct ust_app_session *ua_sess = NULL; |
48842b30 | 3577 | |
fc34caaa DG |
3578 | /* Very wrong code flow */ |
3579 | assert(usess); | |
3580 | assert(uchan); | |
421cb601 | 3581 | |
d9bf3ca4 | 3582 | DBG2("UST app adding channel %s to UST domain for session id %" PRIu64, |
a991f516 | 3583 | uchan->name, usess->id); |
48842b30 DG |
3584 | |
3585 | rcu_read_lock(); | |
421cb601 | 3586 | |
5b4a0ec0 | 3587 | /* For every registered applications */ |
852d0037 | 3588 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3589 | if (!app->compatible) { |
3590 | /* | |
3591 | * TODO: In time, we should notice the caller of this error by | |
3592 | * telling him that this is a version error. | |
3593 | */ | |
3594 | continue; | |
3595 | } | |
edb67388 DG |
3596 | /* |
3597 | * Create session on the tracer side and add it to app session HT. Note | |
3598 | * that if session exist, it will simply return a pointer to the ust | |
3599 | * app session. | |
3600 | */ | |
3d8ca23b DG |
3601 | ret = create_ust_app_session(usess, app, &ua_sess, &created); |
3602 | if (ret < 0) { | |
3603 | switch (ret) { | |
3604 | case -ENOTCONN: | |
3605 | /* | |
3606 | * The application's socket is not valid. Either a bad socket | |
3607 | * or a timeout on it. We can't inform the caller that for a | |
3608 | * specific app, the session failed so lets continue here. | |
3609 | */ | |
3610 | continue; | |
3611 | case -ENOMEM: | |
3612 | default: | |
3613 | goto error_rcu_unlock; | |
3614 | } | |
48842b30 | 3615 | } |
3d8ca23b | 3616 | assert(ua_sess); |
48842b30 | 3617 | |
d0b96690 | 3618 | pthread_mutex_lock(&ua_sess->lock); |
d65d2de8 DG |
3619 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, |
3620 | sizeof(uchan->name))) { | |
ce4846f7 DG |
3621 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, &uchan->attr); |
3622 | ret = 0; | |
d65d2de8 DG |
3623 | } else { |
3624 | /* Create channel onto application. We don't need the chan ref. */ | |
3625 | ret = create_ust_app_channel(ua_sess, uchan, app, | |
3626 | LTTNG_UST_CHAN_PER_CPU, usess, NULL); | |
3627 | } | |
d0b96690 | 3628 | pthread_mutex_unlock(&ua_sess->lock); |
3d8ca23b DG |
3629 | if (ret < 0) { |
3630 | if (ret == -ENOMEM) { | |
3631 | /* No more memory is a fatal error. Stop right now. */ | |
3632 | goto error_rcu_unlock; | |
3633 | } | |
3634 | /* Cleanup the created session if it's the case. */ | |
3635 | if (created) { | |
d0b96690 | 3636 | destroy_app_session(app, ua_sess); |
3d8ca23b | 3637 | } |
48842b30 | 3638 | } |
48842b30 | 3639 | } |
5b4a0ec0 | 3640 | |
95e047ff | 3641 | error_rcu_unlock: |
48842b30 | 3642 | rcu_read_unlock(); |
3c14c33f | 3643 | return ret; |
48842b30 DG |
3644 | } |
3645 | ||
5b4a0ec0 | 3646 | /* |
edb67388 | 3647 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 3648 | */ |
35a9059d | 3649 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3650 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3651 | { | |
3652 | int ret = 0; | |
bec39940 | 3653 | struct lttng_ht_iter iter, uiter; |
18eace3b | 3654 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
3655 | struct ust_app *app; |
3656 | struct ust_app_session *ua_sess; | |
3657 | struct ust_app_channel *ua_chan; | |
3658 | struct ust_app_event *ua_event; | |
48842b30 | 3659 | |
d9bf3ca4 | 3660 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 3661 | uevent->attr.name, usess->id); |
48842b30 | 3662 | |
edb67388 DG |
3663 | /* |
3664 | * NOTE: At this point, this function is called only if the session and | |
3665 | * channel passed are already created for all apps. and enabled on the | |
3666 | * tracer also. | |
3667 | */ | |
3668 | ||
48842b30 | 3669 | rcu_read_lock(); |
421cb601 DG |
3670 | |
3671 | /* For all registered applications */ | |
852d0037 | 3672 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3673 | if (!app->compatible) { |
3674 | /* | |
3675 | * TODO: In time, we should notice the caller of this error by | |
3676 | * telling him that this is a version error. | |
3677 | */ | |
3678 | continue; | |
3679 | } | |
edb67388 | 3680 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3681 | if (!ua_sess) { |
3682 | /* The application has problem or is probably dead. */ | |
3683 | continue; | |
3684 | } | |
ba767faf | 3685 | |
d0b96690 DG |
3686 | pthread_mutex_lock(&ua_sess->lock); |
3687 | ||
edb67388 | 3688 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3689 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3690 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3691 | /* If the channel is not found, there is a code flow error */ |
3692 | assert(ua_chan_node); | |
3693 | ||
3694 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3695 | ||
18eace3b DG |
3696 | /* Get event node */ |
3697 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
39c5a3a7 | 3698 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 3699 | if (ua_event == NULL) { |
7f79d3a1 | 3700 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 3701 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 3702 | goto next_app; |
35a9059d | 3703 | } |
35a9059d DG |
3704 | |
3705 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
3706 | if (ret < 0) { | |
d0b96690 | 3707 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 3708 | goto error; |
48842b30 | 3709 | } |
d0b96690 DG |
3710 | next_app: |
3711 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
3712 | } |
3713 | ||
7f79d3a1 | 3714 | error: |
edb67388 | 3715 | rcu_read_unlock(); |
edb67388 DG |
3716 | return ret; |
3717 | } | |
3718 | ||
3719 | /* | |
3720 | * For a specific existing UST session and UST channel, creates the event for | |
3721 | * all registered apps. | |
3722 | */ | |
35a9059d | 3723 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
3724 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3725 | { | |
3726 | int ret = 0; | |
bec39940 DG |
3727 | struct lttng_ht_iter iter, uiter; |
3728 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
3729 | struct ust_app *app; |
3730 | struct ust_app_session *ua_sess; | |
3731 | struct ust_app_channel *ua_chan; | |
3732 | ||
d9bf3ca4 | 3733 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 3734 | uevent->attr.name, usess->id); |
edb67388 | 3735 | |
edb67388 DG |
3736 | rcu_read_lock(); |
3737 | ||
3738 | /* For all registered applications */ | |
852d0037 | 3739 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3740 | if (!app->compatible) { |
3741 | /* | |
3742 | * TODO: In time, we should notice the caller of this error by | |
3743 | * telling him that this is a version error. | |
3744 | */ | |
3745 | continue; | |
3746 | } | |
edb67388 | 3747 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3748 | if (!ua_sess) { |
3749 | /* The application has problem or is probably dead. */ | |
3750 | continue; | |
3751 | } | |
48842b30 | 3752 | |
d0b96690 | 3753 | pthread_mutex_lock(&ua_sess->lock); |
48842b30 | 3754 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3755 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3756 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3757 | /* If the channel is not found, there is a code flow error */ |
3758 | assert(ua_chan_node); | |
3759 | ||
48842b30 DG |
3760 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3761 | ||
edb67388 | 3762 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 3763 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 3764 | if (ret < 0) { |
49c336c1 | 3765 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
3766 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
3767 | break; | |
3768 | } | |
3769 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 3770 | uevent->attr.name, app->pid); |
5b4a0ec0 | 3771 | continue; |
48842b30 | 3772 | } |
48842b30 | 3773 | } |
5b4a0ec0 | 3774 | |
48842b30 DG |
3775 | rcu_read_unlock(); |
3776 | ||
3777 | return ret; | |
3778 | } | |
3779 | ||
5b4a0ec0 DG |
3780 | /* |
3781 | * Start tracing for a specific UST session and app. | |
3782 | */ | |
b34cbebf | 3783 | static |
421cb601 | 3784 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
3785 | { |
3786 | int ret = 0; | |
48842b30 | 3787 | struct ust_app_session *ua_sess; |
48842b30 | 3788 | |
852d0037 | 3789 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 3790 | |
509cbaf8 MD |
3791 | rcu_read_lock(); |
3792 | ||
e0c7ec2b DG |
3793 | if (!app->compatible) { |
3794 | goto end; | |
3795 | } | |
3796 | ||
421cb601 DG |
3797 | ua_sess = lookup_session_by_app(usess, app); |
3798 | if (ua_sess == NULL) { | |
d42f20df DG |
3799 | /* The session is in teardown process. Ignore and continue. */ |
3800 | goto end; | |
421cb601 | 3801 | } |
48842b30 | 3802 | |
d0b96690 DG |
3803 | pthread_mutex_lock(&ua_sess->lock); |
3804 | ||
aea829b3 DG |
3805 | /* Upon restart, we skip the setup, already done */ |
3806 | if (ua_sess->started) { | |
8be98f9a | 3807 | goto skip_setup; |
aea829b3 | 3808 | } |
8be98f9a | 3809 | |
a4b92340 DG |
3810 | /* Create directories if consumer is LOCAL and has a path defined. */ |
3811 | if (usess->consumer->type == CONSUMER_DST_LOCAL && | |
3812 | strlen(usess->consumer->dst.trace_path) > 0) { | |
3813 | ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path, | |
7972aab2 | 3814 | S_IRWXU | S_IRWXG, ua_sess->euid, ua_sess->egid); |
a4b92340 DG |
3815 | if (ret < 0) { |
3816 | if (ret != -EEXIST) { | |
3817 | ERR("Trace directory creation error"); | |
d0b96690 | 3818 | goto error_unlock; |
421cb601 | 3819 | } |
173af62f | 3820 | } |
7753dea8 | 3821 | } |
aea829b3 | 3822 | |
d65d2de8 DG |
3823 | /* |
3824 | * Create the metadata for the application. This returns gracefully if a | |
3825 | * metadata was already set for the session. | |
3826 | */ | |
ce4846f7 | 3827 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer); |
421cb601 | 3828 | if (ret < 0) { |
d0b96690 | 3829 | goto error_unlock; |
421cb601 | 3830 | } |
48842b30 | 3831 | |
840cb59c | 3832 | health_code_update(); |
86acf0da | 3833 | |
8be98f9a | 3834 | skip_setup: |
421cb601 | 3835 | /* This start the UST tracing */ |
852d0037 | 3836 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
421cb601 | 3837 | if (ret < 0) { |
ffe60014 DG |
3838 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3839 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
3840 | app->pid, ret); | |
3841 | } else { | |
3842 | DBG("UST app start session failed. Application is dead."); | |
3757b385 DG |
3843 | /* |
3844 | * This is normal behavior, an application can die during the | |
3845 | * creation process. Don't report an error so the execution can | |
3846 | * continue normally. | |
3847 | */ | |
3848 | pthread_mutex_unlock(&ua_sess->lock); | |
3849 | goto end; | |
ffe60014 | 3850 | } |
d0b96690 | 3851 | goto error_unlock; |
421cb601 | 3852 | } |
5b4a0ec0 | 3853 | |
55c3953d DG |
3854 | /* Indicate that the session has been started once */ |
3855 | ua_sess->started = 1; | |
3856 | ||
d0b96690 DG |
3857 | pthread_mutex_unlock(&ua_sess->lock); |
3858 | ||
840cb59c | 3859 | health_code_update(); |
86acf0da | 3860 | |
421cb601 | 3861 | /* Quiescent wait after starting trace */ |
ffe60014 DG |
3862 | ret = ustctl_wait_quiescent(app->sock); |
3863 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3864 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3865 | app->pid, ret); | |
3866 | } | |
48842b30 | 3867 | |
e0c7ec2b DG |
3868 | end: |
3869 | rcu_read_unlock(); | |
840cb59c | 3870 | health_code_update(); |
421cb601 | 3871 | return 0; |
48842b30 | 3872 | |
d0b96690 DG |
3873 | error_unlock: |
3874 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 3875 | rcu_read_unlock(); |
840cb59c | 3876 | health_code_update(); |
421cb601 DG |
3877 | return -1; |
3878 | } | |
48842b30 | 3879 | |
8be98f9a MD |
3880 | /* |
3881 | * Stop tracing for a specific UST session and app. | |
3882 | */ | |
b34cbebf | 3883 | static |
8be98f9a MD |
3884 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
3885 | { | |
3886 | int ret = 0; | |
3887 | struct ust_app_session *ua_sess; | |
7972aab2 | 3888 | struct ust_registry_session *registry; |
8be98f9a | 3889 | |
852d0037 | 3890 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
3891 | |
3892 | rcu_read_lock(); | |
3893 | ||
e0c7ec2b | 3894 | if (!app->compatible) { |
d88aee68 | 3895 | goto end_no_session; |
e0c7ec2b DG |
3896 | } |
3897 | ||
8be98f9a MD |
3898 | ua_sess = lookup_session_by_app(usess, app); |
3899 | if (ua_sess == NULL) { | |
d88aee68 | 3900 | goto end_no_session; |
8be98f9a MD |
3901 | } |
3902 | ||
d88aee68 DG |
3903 | pthread_mutex_lock(&ua_sess->lock); |
3904 | ||
9bc07046 DG |
3905 | /* |
3906 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
3907 | * that was never started. It's possible since we can have a fail start |
3908 | * from either the application manager thread or the command thread. Simply | |
3909 | * indicate that this is a stop error. | |
9bc07046 | 3910 | */ |
f9dfc3d9 | 3911 | if (!ua_sess->started) { |
c45536e1 DG |
3912 | goto error_rcu_unlock; |
3913 | } | |
7db205b5 | 3914 | |
840cb59c | 3915 | health_code_update(); |
86acf0da | 3916 | |
9d6c7d3f | 3917 | /* This inhibits UST tracing */ |
852d0037 | 3918 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
9d6c7d3f | 3919 | if (ret < 0) { |
ffe60014 DG |
3920 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3921 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
3922 | app->pid, ret); | |
3923 | } else { | |
3924 | DBG("UST app stop session failed. Application is dead."); | |
3757b385 DG |
3925 | /* |
3926 | * This is normal behavior, an application can die during the | |
3927 | * creation process. Don't report an error so the execution can | |
3928 | * continue normally. | |
3929 | */ | |
3930 | goto end_unlock; | |
ffe60014 | 3931 | } |
9d6c7d3f DG |
3932 | goto error_rcu_unlock; |
3933 | } | |
3934 | ||
840cb59c | 3935 | health_code_update(); |
86acf0da | 3936 | |
9d6c7d3f | 3937 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
3938 | ret = ustctl_wait_quiescent(app->sock); |
3939 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3940 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3941 | app->pid, ret); | |
3942 | } | |
9d6c7d3f | 3943 | |
840cb59c | 3944 | health_code_update(); |
86acf0da | 3945 | |
b34cbebf MD |
3946 | registry = get_session_registry(ua_sess); |
3947 | assert(registry); | |
1b532a60 | 3948 | |
008b9675 MD |
3949 | /* Push metadata for application before freeing the application. */ |
3950 | (void) push_metadata(registry, ua_sess->consumer); | |
b34cbebf | 3951 | |
3757b385 | 3952 | end_unlock: |
b34cbebf MD |
3953 | pthread_mutex_unlock(&ua_sess->lock); |
3954 | end_no_session: | |
3955 | rcu_read_unlock(); | |
3956 | health_code_update(); | |
3957 | return 0; | |
3958 | ||
3959 | error_rcu_unlock: | |
3960 | pthread_mutex_unlock(&ua_sess->lock); | |
3961 | rcu_read_unlock(); | |
3962 | health_code_update(); | |
3963 | return -1; | |
3964 | } | |
3965 | ||
b34cbebf | 3966 | static |
123fb9ed MD |
3967 | int ust_app_flush_app_session(struct ust_app *app, |
3968 | struct ust_app_session *ua_sess) | |
b34cbebf | 3969 | { |
123fb9ed | 3970 | int ret, retval = 0; |
b34cbebf | 3971 | struct lttng_ht_iter iter; |
b34cbebf | 3972 | struct ust_app_channel *ua_chan; |
123fb9ed | 3973 | struct consumer_socket *socket; |
b34cbebf | 3974 | |
123fb9ed | 3975 | DBG("Flushing app session buffers for ust app pid %d", app->pid); |
b34cbebf MD |
3976 | |
3977 | rcu_read_lock(); | |
3978 | ||
3979 | if (!app->compatible) { | |
123fb9ed | 3980 | goto end_not_compatible; |
b34cbebf MD |
3981 | } |
3982 | ||
3983 | pthread_mutex_lock(&ua_sess->lock); | |
3984 | ||
3985 | health_code_update(); | |
3986 | ||
9d6c7d3f | 3987 | /* Flushing buffers */ |
123fb9ed MD |
3988 | socket = consumer_find_socket_by_bitness(app->bits_per_long, |
3989 | ua_sess->consumer); | |
008b9675 MD |
3990 | |
3991 | /* Flush buffers and push metadata. */ | |
3992 | switch (ua_sess->buffer_type) { | |
3993 | case LTTNG_BUFFER_PER_PID: | |
3994 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, | |
3995 | node.node) { | |
3996 | health_code_update(); | |
3997 | assert(ua_chan->is_sent); | |
3998 | ret = consumer_flush_channel(socket, ua_chan->key); | |
3999 | if (ret) { | |
4000 | ERR("Error flushing consumer channel"); | |
4001 | retval = -1; | |
4002 | continue; | |
4003 | } | |
8be98f9a | 4004 | } |
008b9675 MD |
4005 | break; |
4006 | case LTTNG_BUFFER_PER_UID: | |
4007 | default: | |
4008 | assert(0); | |
4009 | break; | |
8be98f9a | 4010 | } |
8be98f9a | 4011 | |
840cb59c | 4012 | health_code_update(); |
86acf0da | 4013 | |
d88aee68 | 4014 | pthread_mutex_unlock(&ua_sess->lock); |
008b9675 | 4015 | |
123fb9ed MD |
4016 | end_not_compatible: |
4017 | rcu_read_unlock(); | |
4018 | health_code_update(); | |
4019 | return retval; | |
4020 | } | |
4021 | ||
4022 | /* | |
008b9675 MD |
4023 | * Flush buffers for all applications for a specific UST session. |
4024 | * Called with UST session lock held. | |
123fb9ed MD |
4025 | */ |
4026 | static | |
008b9675 | 4027 | int ust_app_flush_session(struct ltt_ust_session *usess) |
123fb9ed MD |
4028 | |
4029 | { | |
4030 | int ret; | |
123fb9ed | 4031 | |
008b9675 | 4032 | DBG("Flushing session buffers for all ust apps"); |
123fb9ed MD |
4033 | |
4034 | rcu_read_lock(); | |
4035 | ||
008b9675 MD |
4036 | /* Flush buffers and push metadata. */ |
4037 | switch (usess->buffer_type) { | |
4038 | case LTTNG_BUFFER_PER_UID: | |
4039 | { | |
4040 | struct buffer_reg_uid *reg; | |
4041 | struct lttng_ht_iter iter; | |
4042 | ||
4043 | /* Flush all per UID buffers associated to that session. */ | |
4044 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
4045 | struct ust_registry_session *ust_session_reg; | |
4046 | struct buffer_reg_channel *reg_chan; | |
4047 | struct consumer_socket *socket; | |
4048 | ||
4049 | /* Get consumer socket to use to push the metadata.*/ | |
4050 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
4051 | usess->consumer); | |
4052 | if (!socket) { | |
4053 | /* Ignore request if no consumer is found for the session. */ | |
4054 | continue; | |
4055 | } | |
4056 | ||
4057 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
4058 | reg_chan, node.node) { | |
4059 | /* | |
4060 | * The following call will print error values so the return | |
4061 | * code is of little importance because whatever happens, we | |
4062 | * have to try them all. | |
4063 | */ | |
4064 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
4065 | } | |
4066 | ||
4067 | ust_session_reg = reg->registry->reg.ust; | |
4068 | /* Push metadata. */ | |
4069 | (void) push_metadata(ust_session_reg, usess->consumer); | |
4070 | } | |
4071 | ret = 0; | |
4072 | break; | |
4073 | } | |
4074 | case LTTNG_BUFFER_PER_PID: | |
4075 | { | |
4076 | struct ust_app_session *ua_sess; | |
4077 | struct lttng_ht_iter iter; | |
4078 | struct ust_app *app; | |
4079 | ||
4080 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4081 | ua_sess = lookup_session_by_app(usess, app); | |
4082 | if (ua_sess == NULL) { | |
4083 | continue; | |
4084 | } | |
4085 | (void) ust_app_flush_app_session(app, ua_sess); | |
4086 | } | |
4087 | break; | |
4088 | } | |
4089 | default: | |
4090 | assert(0); | |
4091 | break; | |
123fb9ed | 4092 | } |
123fb9ed | 4093 | |
d88aee68 | 4094 | end_no_session: |
7db205b5 | 4095 | rcu_read_unlock(); |
840cb59c | 4096 | health_code_update(); |
123fb9ed | 4097 | return ret; |
8be98f9a MD |
4098 | } |
4099 | ||
84cd17c6 MD |
4100 | /* |
4101 | * Destroy a specific UST session in apps. | |
4102 | */ | |
3353de95 | 4103 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 4104 | { |
ffe60014 | 4105 | int ret; |
84cd17c6 | 4106 | struct ust_app_session *ua_sess; |
bec39940 | 4107 | struct lttng_ht_iter iter; |
d9bf3ca4 | 4108 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 4109 | |
852d0037 | 4110 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
4111 | |
4112 | rcu_read_lock(); | |
4113 | ||
e0c7ec2b DG |
4114 | if (!app->compatible) { |
4115 | goto end; | |
4116 | } | |
4117 | ||
84cd17c6 | 4118 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 4119 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 4120 | if (node == NULL) { |
d42f20df DG |
4121 | /* Session is being or is deleted. */ |
4122 | goto end; | |
84cd17c6 MD |
4123 | } |
4124 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 4125 | |
840cb59c | 4126 | health_code_update(); |
d0b96690 | 4127 | destroy_app_session(app, ua_sess); |
84cd17c6 | 4128 | |
840cb59c | 4129 | health_code_update(); |
7db205b5 | 4130 | |
84cd17c6 | 4131 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
4132 | ret = ustctl_wait_quiescent(app->sock); |
4133 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4134 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4135 | app->pid, ret); | |
4136 | } | |
e0c7ec2b DG |
4137 | end: |
4138 | rcu_read_unlock(); | |
840cb59c | 4139 | health_code_update(); |
84cd17c6 | 4140 | return 0; |
84cd17c6 MD |
4141 | } |
4142 | ||
5b4a0ec0 DG |
4143 | /* |
4144 | * Start tracing for the UST session. | |
4145 | */ | |
421cb601 DG |
4146 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
4147 | { | |
4148 | int ret = 0; | |
bec39940 | 4149 | struct lttng_ht_iter iter; |
421cb601 | 4150 | struct ust_app *app; |
48842b30 | 4151 | |
421cb601 DG |
4152 | DBG("Starting all UST traces"); |
4153 | ||
4154 | rcu_read_lock(); | |
421cb601 | 4155 | |
852d0037 | 4156 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
421cb601 | 4157 | ret = ust_app_start_trace(usess, app); |
48842b30 | 4158 | if (ret < 0) { |
5b4a0ec0 DG |
4159 | /* Continue to next apps even on error */ |
4160 | continue; | |
48842b30 | 4161 | } |
48842b30 | 4162 | } |
5b4a0ec0 | 4163 | |
48842b30 DG |
4164 | rcu_read_unlock(); |
4165 | ||
4166 | return 0; | |
4167 | } | |
487cf67c | 4168 | |
8be98f9a MD |
4169 | /* |
4170 | * Start tracing for the UST session. | |
008b9675 | 4171 | * Called with UST session lock held. |
8be98f9a MD |
4172 | */ |
4173 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
4174 | { | |
4175 | int ret = 0; | |
bec39940 | 4176 | struct lttng_ht_iter iter; |
8be98f9a MD |
4177 | struct ust_app *app; |
4178 | ||
4179 | DBG("Stopping all UST traces"); | |
4180 | ||
4181 | rcu_read_lock(); | |
4182 | ||
b34cbebf MD |
4183 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4184 | ret = ust_app_stop_trace(usess, app); | |
4185 | if (ret < 0) { | |
4186 | /* Continue to next apps even on error */ | |
4187 | continue; | |
4188 | } | |
4189 | } | |
4190 | ||
008b9675 | 4191 | (void) ust_app_flush_session(usess); |
8be98f9a MD |
4192 | |
4193 | rcu_read_unlock(); | |
4194 | ||
4195 | return 0; | |
4196 | } | |
4197 | ||
84cd17c6 MD |
4198 | /* |
4199 | * Destroy app UST session. | |
4200 | */ | |
4201 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
4202 | { | |
4203 | int ret = 0; | |
bec39940 | 4204 | struct lttng_ht_iter iter; |
84cd17c6 MD |
4205 | struct ust_app *app; |
4206 | ||
4207 | DBG("Destroy all UST traces"); | |
4208 | ||
4209 | rcu_read_lock(); | |
4210 | ||
852d0037 | 4211 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 4212 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
4213 | if (ret < 0) { |
4214 | /* Continue to next apps even on error */ | |
4215 | continue; | |
4216 | } | |
4217 | } | |
4218 | ||
4219 | rcu_read_unlock(); | |
4220 | ||
4221 | return 0; | |
4222 | } | |
4223 | ||
5b4a0ec0 DG |
4224 | /* |
4225 | * Add channels/events from UST global domain to registered apps at sock. | |
4226 | */ | |
487cf67c DG |
4227 | void ust_app_global_update(struct ltt_ust_session *usess, int sock) |
4228 | { | |
55c54cce | 4229 | int ret = 0; |
31746f93 | 4230 | struct lttng_ht_iter iter, uiter; |
487cf67c | 4231 | struct ust_app *app; |
3d8ca23b | 4232 | struct ust_app_session *ua_sess = NULL; |
487cf67c DG |
4233 | struct ust_app_channel *ua_chan; |
4234 | struct ust_app_event *ua_event; | |
727d5404 | 4235 | struct ust_app_ctx *ua_ctx; |
1f3580c7 | 4236 | |
95e047ff | 4237 | assert(usess); |
ffe60014 | 4238 | assert(sock >= 0); |
1f3580c7 | 4239 | |
d9bf3ca4 | 4240 | DBG2("UST app global update for app sock %d for session id %" PRIu64, sock, |
a991f516 | 4241 | usess->id); |
487cf67c | 4242 | |
284d8f55 DG |
4243 | rcu_read_lock(); |
4244 | ||
f20baf8e | 4245 | app = ust_app_find_by_sock(sock); |
487cf67c | 4246 | if (app == NULL) { |
d88aee68 DG |
4247 | /* |
4248 | * Application can be unregistered before so this is possible hence | |
4249 | * simply stopping the update. | |
4250 | */ | |
4251 | DBG3("UST app update failed to find app sock %d", sock); | |
487cf67c DG |
4252 | goto error; |
4253 | } | |
4254 | ||
e0c7ec2b DG |
4255 | if (!app->compatible) { |
4256 | goto error; | |
4257 | } | |
4258 | ||
3d8ca23b DG |
4259 | ret = create_ust_app_session(usess, app, &ua_sess, NULL); |
4260 | if (ret < 0) { | |
4261 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
4262 | goto error; |
4263 | } | |
3d8ca23b | 4264 | assert(ua_sess); |
487cf67c | 4265 | |
d0b96690 DG |
4266 | pthread_mutex_lock(&ua_sess->lock); |
4267 | ||
284d8f55 | 4268 | /* |
d0b96690 | 4269 | * We can iterate safely here over all UST app session since the create ust |
284d8f55 DG |
4270 | * app session above made a shadow copy of the UST global domain from the |
4271 | * ltt ust session. | |
4272 | */ | |
bec39940 DG |
4273 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
4274 | node.node) { | |
ce4846f7 DG |
4275 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
4276 | if (ret < 0) { | |
4277 | /* | |
4278 | * Stop everything. On error, the application failed, no more | |
4279 | * file descriptor are available or ENOMEM so stopping here is | |
4280 | * the only thing we can do for now. | |
4281 | */ | |
4282 | goto error_unlock; | |
487cf67c DG |
4283 | } |
4284 | ||
31746f93 DG |
4285 | /* |
4286 | * Add context using the list so they are enabled in the same order the | |
4287 | * user added them. | |
4288 | */ | |
4289 | cds_list_for_each_entry(ua_ctx, &ua_chan->ctx_list, list) { | |
727d5404 DG |
4290 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); |
4291 | if (ret < 0) { | |
d0b96690 | 4292 | goto error_unlock; |
727d5404 DG |
4293 | } |
4294 | } | |
4295 | ||
4296 | ||
284d8f55 | 4297 | /* For each events */ |
bec39940 DG |
4298 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
4299 | node.node) { | |
284d8f55 DG |
4300 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
4301 | if (ret < 0) { | |
d0b96690 | 4302 | goto error_unlock; |
487cf67c | 4303 | } |
36dc12cc | 4304 | } |
487cf67c DG |
4305 | } |
4306 | ||
d0b96690 DG |
4307 | pthread_mutex_unlock(&ua_sess->lock); |
4308 | ||
36dc12cc | 4309 | if (usess->start_trace) { |
421cb601 | 4310 | ret = ust_app_start_trace(usess, app); |
36dc12cc | 4311 | if (ret < 0) { |
36dc12cc DG |
4312 | goto error; |
4313 | } | |
4314 | ||
852d0037 | 4315 | DBG2("UST trace started for app pid %d", app->pid); |
36dc12cc DG |
4316 | } |
4317 | ||
ffe60014 DG |
4318 | /* Everything went well at this point. */ |
4319 | rcu_read_unlock(); | |
4320 | return; | |
4321 | ||
d0b96690 DG |
4322 | error_unlock: |
4323 | pthread_mutex_unlock(&ua_sess->lock); | |
487cf67c | 4324 | error: |
ffe60014 | 4325 | if (ua_sess) { |
d0b96690 | 4326 | destroy_app_session(app, ua_sess); |
ffe60014 | 4327 | } |
487cf67c DG |
4328 | rcu_read_unlock(); |
4329 | return; | |
4330 | } | |
55cc08a6 DG |
4331 | |
4332 | /* | |
4333 | * Add context to a specific channel for global UST domain. | |
4334 | */ | |
4335 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
4336 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
4337 | { | |
4338 | int ret = 0; | |
bec39940 DG |
4339 | struct lttng_ht_node_str *ua_chan_node; |
4340 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
4341 | struct ust_app_channel *ua_chan = NULL; |
4342 | struct ust_app_session *ua_sess; | |
4343 | struct ust_app *app; | |
4344 | ||
4345 | rcu_read_lock(); | |
4346 | ||
852d0037 | 4347 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4348 | if (!app->compatible) { |
4349 | /* | |
4350 | * TODO: In time, we should notice the caller of this error by | |
4351 | * telling him that this is a version error. | |
4352 | */ | |
4353 | continue; | |
4354 | } | |
55cc08a6 DG |
4355 | ua_sess = lookup_session_by_app(usess, app); |
4356 | if (ua_sess == NULL) { | |
4357 | continue; | |
4358 | } | |
4359 | ||
d0b96690 | 4360 | pthread_mutex_lock(&ua_sess->lock); |
55cc08a6 | 4361 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4362 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4363 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 4364 | if (ua_chan_node == NULL) { |
d0b96690 | 4365 | goto next_app; |
55cc08a6 DG |
4366 | } |
4367 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
4368 | node); | |
55cc08a6 DG |
4369 | ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app); |
4370 | if (ret < 0) { | |
d0b96690 | 4371 | goto next_app; |
55cc08a6 | 4372 | } |
d0b96690 DG |
4373 | next_app: |
4374 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
4375 | } |
4376 | ||
55cc08a6 DG |
4377 | rcu_read_unlock(); |
4378 | return ret; | |
4379 | } | |
4380 | ||
76d45b40 DG |
4381 | /* |
4382 | * Enable event for a channel from a UST session for a specific PID. | |
4383 | */ | |
4384 | int ust_app_enable_event_pid(struct ltt_ust_session *usess, | |
4385 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4386 | { | |
4387 | int ret = 0; | |
bec39940 | 4388 | struct lttng_ht_iter iter; |
18eace3b | 4389 | struct lttng_ht_node_str *ua_chan_node; |
76d45b40 DG |
4390 | struct ust_app *app; |
4391 | struct ust_app_session *ua_sess; | |
4392 | struct ust_app_channel *ua_chan; | |
4393 | struct ust_app_event *ua_event; | |
4394 | ||
4395 | DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid); | |
4396 | ||
4397 | rcu_read_lock(); | |
4398 | ||
4399 | app = ust_app_find_by_pid(pid); | |
4400 | if (app == NULL) { | |
4401 | ERR("UST app enable event per PID %d not found", pid); | |
4402 | ret = -1; | |
d0b96690 | 4403 | goto end; |
76d45b40 DG |
4404 | } |
4405 | ||
e0c7ec2b DG |
4406 | if (!app->compatible) { |
4407 | ret = 0; | |
d0b96690 | 4408 | goto end; |
e0c7ec2b DG |
4409 | } |
4410 | ||
76d45b40 | 4411 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4412 | if (!ua_sess) { |
4413 | /* The application has problem or is probably dead. */ | |
d0b96690 DG |
4414 | ret = 0; |
4415 | goto end; | |
c4a1715b | 4416 | } |
76d45b40 | 4417 | |
d0b96690 | 4418 | pthread_mutex_lock(&ua_sess->lock); |
76d45b40 | 4419 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4420 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4421 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
76d45b40 DG |
4422 | /* If the channel is not found, there is a code flow error */ |
4423 | assert(ua_chan_node); | |
4424 | ||
4425 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4426 | ||
18eace3b | 4427 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 4428 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 4429 | if (ua_event == NULL) { |
76d45b40 DG |
4430 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
4431 | if (ret < 0) { | |
d0b96690 | 4432 | goto end_unlock; |
76d45b40 DG |
4433 | } |
4434 | } else { | |
76d45b40 DG |
4435 | ret = enable_ust_app_event(ua_sess, ua_event, app); |
4436 | if (ret < 0) { | |
d0b96690 | 4437 | goto end_unlock; |
76d45b40 DG |
4438 | } |
4439 | } | |
4440 | ||
d0b96690 DG |
4441 | end_unlock: |
4442 | pthread_mutex_unlock(&ua_sess->lock); | |
4443 | end: | |
76d45b40 DG |
4444 | rcu_read_unlock(); |
4445 | return ret; | |
4446 | } | |
7f79d3a1 | 4447 | |
4466912f DG |
4448 | /* |
4449 | * Calibrate registered applications. | |
4450 | */ | |
4451 | int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate) | |
4452 | { | |
4453 | int ret = 0; | |
4454 | struct lttng_ht_iter iter; | |
4455 | struct ust_app *app; | |
4456 | ||
4457 | rcu_read_lock(); | |
4458 | ||
852d0037 | 4459 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4466912f DG |
4460 | if (!app->compatible) { |
4461 | /* | |
4462 | * TODO: In time, we should notice the caller of this error by | |
4463 | * telling him that this is a version error. | |
4464 | */ | |
4465 | continue; | |
4466 | } | |
4467 | ||
840cb59c | 4468 | health_code_update(); |
86acf0da | 4469 | |
852d0037 | 4470 | ret = ustctl_calibrate(app->sock, calibrate); |
4466912f DG |
4471 | if (ret < 0) { |
4472 | switch (ret) { | |
4473 | case -ENOSYS: | |
4474 | /* Means that it's not implemented on the tracer side. */ | |
4475 | ret = 0; | |
4476 | break; | |
4477 | default: | |
4466912f | 4478 | DBG2("Calibrate app PID %d returned with error %d", |
852d0037 | 4479 | app->pid, ret); |
4466912f DG |
4480 | break; |
4481 | } | |
4482 | } | |
4483 | } | |
4484 | ||
4485 | DBG("UST app global domain calibration finished"); | |
4486 | ||
4487 | rcu_read_unlock(); | |
4488 | ||
840cb59c | 4489 | health_code_update(); |
86acf0da | 4490 | |
4466912f DG |
4491 | return ret; |
4492 | } | |
d0b96690 DG |
4493 | |
4494 | /* | |
4495 | * Receive registration and populate the given msg structure. | |
4496 | * | |
4497 | * On success return 0 else a negative value returned by the ustctl call. | |
4498 | */ | |
4499 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
4500 | { | |
4501 | int ret; | |
4502 | uint32_t pid, ppid, uid, gid; | |
4503 | ||
4504 | assert(msg); | |
4505 | ||
4506 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
4507 | &pid, &ppid, &uid, &gid, | |
4508 | &msg->bits_per_long, | |
4509 | &msg->uint8_t_alignment, | |
4510 | &msg->uint16_t_alignment, | |
4511 | &msg->uint32_t_alignment, | |
4512 | &msg->uint64_t_alignment, | |
4513 | &msg->long_alignment, | |
4514 | &msg->byte_order, | |
4515 | msg->name); | |
4516 | if (ret < 0) { | |
4517 | switch (-ret) { | |
4518 | case EPIPE: | |
4519 | case ECONNRESET: | |
4520 | case LTTNG_UST_ERR_EXITING: | |
4521 | DBG3("UST app recv reg message failed. Application died"); | |
4522 | break; | |
4523 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
4524 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
4525 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
4526 | LTTNG_UST_ABI_MINOR_VERSION); | |
4527 | break; | |
4528 | default: | |
4529 | ERR("UST app recv reg message failed with ret %d", ret); | |
4530 | break; | |
4531 | } | |
4532 | goto error; | |
4533 | } | |
4534 | msg->pid = (pid_t) pid; | |
4535 | msg->ppid = (pid_t) ppid; | |
4536 | msg->uid = (uid_t) uid; | |
4537 | msg->gid = (gid_t) gid; | |
4538 | ||
4539 | error: | |
4540 | return ret; | |
4541 | } | |
4542 | ||
d88aee68 DG |
4543 | /* |
4544 | * Return a ust app channel object using the application object and the channel | |
4545 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
4546 | * lock MUST be acquired before calling this function. | |
4547 | */ | |
d0b96690 DG |
4548 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
4549 | int objd) | |
4550 | { | |
4551 | struct lttng_ht_node_ulong *node; | |
4552 | struct lttng_ht_iter iter; | |
4553 | struct ust_app_channel *ua_chan = NULL; | |
4554 | ||
4555 | assert(app); | |
4556 | ||
4557 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
4558 | node = lttng_ht_iter_get_node_ulong(&iter); | |
4559 | if (node == NULL) { | |
4560 | DBG2("UST app channel find by objd %d not found", objd); | |
4561 | goto error; | |
4562 | } | |
4563 | ||
4564 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
4565 | ||
4566 | error: | |
4567 | return ua_chan; | |
4568 | } | |
4569 | ||
d88aee68 DG |
4570 | /* |
4571 | * Reply to a register channel notification from an application on the notify | |
4572 | * socket. The channel metadata is also created. | |
4573 | * | |
4574 | * The session UST registry lock is acquired in this function. | |
4575 | * | |
4576 | * On success 0 is returned else a negative value. | |
4577 | */ | |
d0b96690 DG |
4578 | static int reply_ust_register_channel(int sock, int sobjd, int cobjd, |
4579 | size_t nr_fields, struct ustctl_field *fields) | |
4580 | { | |
4581 | int ret, ret_code = 0; | |
4582 | uint32_t chan_id, reg_count; | |
7972aab2 | 4583 | uint64_t chan_reg_key; |
d0b96690 DG |
4584 | enum ustctl_channel_header type; |
4585 | struct ust_app *app; | |
4586 | struct ust_app_channel *ua_chan; | |
4587 | struct ust_app_session *ua_sess; | |
7972aab2 | 4588 | struct ust_registry_session *registry; |
45893984 | 4589 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
4590 | |
4591 | rcu_read_lock(); | |
4592 | ||
4593 | /* Lookup application. If not found, there is a code flow error. */ | |
4594 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4595 | if (!app) { |
4596 | DBG("Application socket %d is being teardown. Abort event notify", | |
4597 | sock); | |
4598 | ret = 0; | |
d5d629b5 | 4599 | free(fields); |
d88aee68 DG |
4600 | goto error_rcu_unlock; |
4601 | } | |
d0b96690 | 4602 | |
4950b860 | 4603 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4604 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4605 | if (!ua_chan) { |
4606 | DBG("Application channel is being teardown. Abort event notify"); | |
4607 | ret = 0; | |
d5d629b5 | 4608 | free(fields); |
4950b860 MD |
4609 | goto error_rcu_unlock; |
4610 | } | |
4611 | ||
d0b96690 DG |
4612 | assert(ua_chan->session); |
4613 | ua_sess = ua_chan->session; | |
d0b96690 | 4614 | |
7972aab2 DG |
4615 | /* Get right session registry depending on the session buffer type. */ |
4616 | registry = get_session_registry(ua_sess); | |
4617 | assert(registry); | |
45893984 | 4618 | |
7972aab2 DG |
4619 | /* Depending on the buffer type, a different channel key is used. */ |
4620 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4621 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 4622 | } else { |
7972aab2 | 4623 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
4624 | } |
4625 | ||
7972aab2 DG |
4626 | pthread_mutex_lock(®istry->lock); |
4627 | ||
4628 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
4629 | assert(chan_reg); | |
4630 | ||
4631 | if (!chan_reg->register_done) { | |
4632 | reg_count = ust_registry_get_event_count(chan_reg); | |
4633 | if (reg_count < 31) { | |
4634 | type = USTCTL_CHANNEL_HEADER_COMPACT; | |
4635 | } else { | |
4636 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
4637 | } | |
4638 | ||
4639 | chan_reg->nr_ctx_fields = nr_fields; | |
4640 | chan_reg->ctx_fields = fields; | |
4641 | chan_reg->header_type = type; | |
d0b96690 | 4642 | } else { |
7972aab2 DG |
4643 | /* Get current already assigned values. */ |
4644 | type = chan_reg->header_type; | |
d5d629b5 DG |
4645 | free(fields); |
4646 | /* Set to NULL so the error path does not do a double free. */ | |
4647 | fields = NULL; | |
d0b96690 | 4648 | } |
7972aab2 DG |
4649 | /* Channel id is set during the object creation. */ |
4650 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
4651 | |
4652 | /* Append to metadata */ | |
7972aab2 DG |
4653 | if (!chan_reg->metadata_dumped) { |
4654 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
4655 | if (ret_code) { |
4656 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
4657 | goto reply; | |
4658 | } | |
4659 | } | |
4660 | ||
4661 | reply: | |
7972aab2 DG |
4662 | DBG3("UST app replying to register channel key %" PRIu64 |
4663 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
4664 | ret_code); | |
d0b96690 DG |
4665 | |
4666 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
4667 | if (ret < 0) { | |
4668 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4669 | ERR("UST app reply channel failed with ret %d", ret); | |
4670 | } else { | |
4671 | DBG3("UST app reply channel failed. Application died"); | |
4672 | } | |
4673 | goto error; | |
4674 | } | |
4675 | ||
7972aab2 DG |
4676 | /* This channel registry registration is completed. */ |
4677 | chan_reg->register_done = 1; | |
4678 | ||
d0b96690 | 4679 | error: |
7972aab2 | 4680 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4681 | error_rcu_unlock: |
d0b96690 | 4682 | rcu_read_unlock(); |
d5d629b5 DG |
4683 | if (ret) { |
4684 | free(fields); | |
4685 | } | |
d0b96690 DG |
4686 | return ret; |
4687 | } | |
4688 | ||
d88aee68 DG |
4689 | /* |
4690 | * Add event to the UST channel registry. When the event is added to the | |
4691 | * registry, the metadata is also created. Once done, this replies to the | |
4692 | * application with the appropriate error code. | |
4693 | * | |
4694 | * The session UST registry lock is acquired in the function. | |
4695 | * | |
4696 | * On success 0 is returned else a negative value. | |
4697 | */ | |
d0b96690 DG |
4698 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
4699 | char *sig, size_t nr_fields, struct ustctl_field *fields, int loglevel, | |
4700 | char *model_emf_uri) | |
4701 | { | |
4702 | int ret, ret_code; | |
4703 | uint32_t event_id = 0; | |
7972aab2 | 4704 | uint64_t chan_reg_key; |
d0b96690 DG |
4705 | struct ust_app *app; |
4706 | struct ust_app_channel *ua_chan; | |
4707 | struct ust_app_session *ua_sess; | |
7972aab2 | 4708 | struct ust_registry_session *registry; |
d0b96690 DG |
4709 | |
4710 | rcu_read_lock(); | |
4711 | ||
4712 | /* Lookup application. If not found, there is a code flow error. */ | |
4713 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4714 | if (!app) { |
4715 | DBG("Application socket %d is being teardown. Abort event notify", | |
4716 | sock); | |
4717 | ret = 0; | |
d5d629b5 DG |
4718 | free(sig); |
4719 | free(fields); | |
4720 | free(model_emf_uri); | |
d88aee68 DG |
4721 | goto error_rcu_unlock; |
4722 | } | |
d0b96690 | 4723 | |
4950b860 | 4724 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4725 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4726 | if (!ua_chan) { |
4727 | DBG("Application channel is being teardown. Abort event notify"); | |
4728 | ret = 0; | |
d5d629b5 DG |
4729 | free(sig); |
4730 | free(fields); | |
4731 | free(model_emf_uri); | |
4950b860 MD |
4732 | goto error_rcu_unlock; |
4733 | } | |
4734 | ||
d0b96690 DG |
4735 | assert(ua_chan->session); |
4736 | ua_sess = ua_chan->session; | |
4737 | ||
7972aab2 DG |
4738 | registry = get_session_registry(ua_sess); |
4739 | assert(registry); | |
4740 | ||
4741 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4742 | chan_reg_key = ua_chan->tracing_channel_id; | |
4743 | } else { | |
4744 | chan_reg_key = ua_chan->key; | |
4745 | } | |
4746 | ||
4747 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 4748 | |
d5d629b5 DG |
4749 | /* |
4750 | * From this point on, this call acquires the ownership of the sig, fields | |
4751 | * and model_emf_uri meaning any free are done inside it if needed. These | |
4752 | * three variables MUST NOT be read/write after this. | |
4753 | */ | |
7972aab2 | 4754 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
45893984 | 4755 | sobjd, cobjd, name, sig, nr_fields, fields, loglevel, |
8494bda5 MD |
4756 | model_emf_uri, ua_sess->buffer_type, &event_id, |
4757 | app); | |
d0b96690 DG |
4758 | |
4759 | /* | |
4760 | * The return value is returned to ustctl so in case of an error, the | |
4761 | * application can be notified. In case of an error, it's important not to | |
4762 | * return a negative error or else the application will get closed. | |
4763 | */ | |
4764 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
4765 | if (ret < 0) { | |
4766 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4767 | ERR("UST app reply event failed with ret %d", ret); | |
4768 | } else { | |
4769 | DBG3("UST app reply event failed. Application died"); | |
4770 | } | |
4771 | /* | |
4772 | * No need to wipe the create event since the application socket will | |
4773 | * get close on error hence cleaning up everything by itself. | |
4774 | */ | |
4775 | goto error; | |
4776 | } | |
4777 | ||
7972aab2 DG |
4778 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
4779 | name, event_id); | |
d88aee68 | 4780 | |
d0b96690 | 4781 | error: |
7972aab2 | 4782 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4783 | error_rcu_unlock: |
d0b96690 DG |
4784 | rcu_read_unlock(); |
4785 | return ret; | |
4786 | } | |
4787 | ||
d88aee68 DG |
4788 | /* |
4789 | * Handle application notification through the given notify socket. | |
4790 | * | |
4791 | * Return 0 on success or else a negative value. | |
4792 | */ | |
d0b96690 DG |
4793 | int ust_app_recv_notify(int sock) |
4794 | { | |
4795 | int ret; | |
4796 | enum ustctl_notify_cmd cmd; | |
4797 | ||
4798 | DBG3("UST app receiving notify from sock %d", sock); | |
4799 | ||
4800 | ret = ustctl_recv_notify(sock, &cmd); | |
4801 | if (ret < 0) { | |
4802 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4803 | ERR("UST app recv notify failed with ret %d", ret); | |
4804 | } else { | |
4805 | DBG3("UST app recv notify failed. Application died"); | |
4806 | } | |
4807 | goto error; | |
4808 | } | |
4809 | ||
4810 | switch (cmd) { | |
4811 | case USTCTL_NOTIFY_CMD_EVENT: | |
4812 | { | |
4813 | int sobjd, cobjd, loglevel; | |
4814 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; | |
4815 | size_t nr_fields; | |
4816 | struct ustctl_field *fields; | |
4817 | ||
4818 | DBG2("UST app ustctl register event received"); | |
4819 | ||
4820 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, &loglevel, | |
4821 | &sig, &nr_fields, &fields, &model_emf_uri); | |
4822 | if (ret < 0) { | |
4823 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4824 | ERR("UST app recv event failed with ret %d", ret); | |
4825 | } else { | |
4826 | DBG3("UST app recv event failed. Application died"); | |
4827 | } | |
4828 | goto error; | |
4829 | } | |
4830 | ||
d5d629b5 DG |
4831 | /* |
4832 | * Add event to the UST registry coming from the notify socket. This | |
4833 | * call will free if needed the sig, fields and model_emf_uri. This | |
4834 | * code path loses the ownsership of these variables and transfer them | |
4835 | * to the this function. | |
4836 | */ | |
d0b96690 DG |
4837 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
4838 | fields, loglevel, model_emf_uri); | |
4839 | if (ret < 0) { | |
4840 | goto error; | |
4841 | } | |
4842 | ||
4843 | break; | |
4844 | } | |
4845 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
4846 | { | |
4847 | int sobjd, cobjd; | |
4848 | size_t nr_fields; | |
4849 | struct ustctl_field *fields; | |
4850 | ||
4851 | DBG2("UST app ustctl register channel received"); | |
4852 | ||
4853 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
4854 | &fields); | |
4855 | if (ret < 0) { | |
4856 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4857 | ERR("UST app recv channel failed with ret %d", ret); | |
4858 | } else { | |
4859 | DBG3("UST app recv channel failed. Application died"); | |
4860 | } | |
4861 | goto error; | |
4862 | } | |
4863 | ||
d5d629b5 DG |
4864 | /* |
4865 | * The fields ownership are transfered to this function call meaning | |
4866 | * that if needed it will be freed. After this, it's invalid to access | |
4867 | * fields or clean it up. | |
4868 | */ | |
d0b96690 DG |
4869 | ret = reply_ust_register_channel(sock, sobjd, cobjd, nr_fields, |
4870 | fields); | |
4871 | if (ret < 0) { | |
4872 | goto error; | |
4873 | } | |
4874 | ||
4875 | break; | |
4876 | } | |
4877 | default: | |
4878 | /* Should NEVER happen. */ | |
4879 | assert(0); | |
4880 | } | |
4881 | ||
4882 | error: | |
4883 | return ret; | |
4884 | } | |
d88aee68 DG |
4885 | |
4886 | /* | |
4887 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
4888 | * corresponding application. On failure, the call_rcu to close the socket is | |
4889 | * executed. If an application is found, it tries to delete it from the notify | |
4890 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
4891 | * | |
4892 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
4893 | * call RCU is not done but the rest of the cleanup is. | |
4894 | */ | |
4895 | void ust_app_notify_sock_unregister(int sock) | |
4896 | { | |
4897 | int err_enomem = 0; | |
4898 | struct lttng_ht_iter iter; | |
4899 | struct ust_app *app; | |
4900 | struct ust_app_notify_sock_obj *obj; | |
4901 | ||
4902 | assert(sock >= 0); | |
4903 | ||
4904 | rcu_read_lock(); | |
4905 | ||
4906 | obj = zmalloc(sizeof(*obj)); | |
4907 | if (!obj) { | |
4908 | /* | |
4909 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
4910 | * procedure but the call_rcu will not be called. In this case, we | |
4911 | * accept the fd leak rather than possibly creating an unsynchronized | |
4912 | * state between threads. | |
4913 | * | |
4914 | * TODO: The notify object should be created once the notify socket is | |
4915 | * registered and stored independantely from the ust app object. The | |
4916 | * tricky part is to synchronize the teardown of the application and | |
4917 | * this notify object. Let's keep that in mind so we can avoid this | |
4918 | * kind of shenanigans with ENOMEM in the teardown path. | |
4919 | */ | |
4920 | err_enomem = 1; | |
4921 | } else { | |
4922 | obj->fd = sock; | |
4923 | } | |
4924 | ||
4925 | DBG("UST app notify socket unregister %d", sock); | |
4926 | ||
4927 | /* | |
4928 | * Lookup application by notify socket. If this fails, this means that the | |
4929 | * hash table delete has already been done by the application | |
4930 | * unregistration process so we can safely close the notify socket in a | |
4931 | * call RCU. | |
4932 | */ | |
4933 | app = find_app_by_notify_sock(sock); | |
4934 | if (!app) { | |
4935 | goto close_socket; | |
4936 | } | |
4937 | ||
4938 | iter.iter.node = &app->notify_sock_n.node; | |
4939 | ||
4940 | /* | |
4941 | * Whatever happens here either we fail or succeed, in both cases we have | |
4942 | * to close the socket after a grace period to continue to the call RCU | |
4943 | * here. If the deletion is successful, the application is not visible | |
4944 | * anymore by other threads and is it fails it means that it was already | |
4945 | * deleted from the hash table so either way we just have to close the | |
4946 | * socket. | |
4947 | */ | |
4948 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
4949 | ||
4950 | close_socket: | |
4951 | rcu_read_unlock(); | |
4952 | ||
4953 | /* | |
4954 | * Close socket after a grace period to avoid for the socket to be reused | |
4955 | * before the application object is freed creating potential race between | |
4956 | * threads trying to add unique in the global hash table. | |
4957 | */ | |
4958 | if (!err_enomem) { | |
4959 | call_rcu(&obj->head, close_notify_sock_rcu); | |
4960 | } | |
4961 | } | |
f45e313d DG |
4962 | |
4963 | /* | |
4964 | * Destroy a ust app data structure and free its memory. | |
4965 | */ | |
4966 | void ust_app_destroy(struct ust_app *app) | |
4967 | { | |
4968 | if (!app) { | |
4969 | return; | |
4970 | } | |
4971 | ||
4972 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
4973 | } | |
6dc3064a DG |
4974 | |
4975 | /* | |
4976 | * Take a snapshot for a given UST session. The snapshot is sent to the given | |
4977 | * output. | |
4978 | * | |
4979 | * Return 0 on success or else a negative value. | |
4980 | */ | |
4981 | int ust_app_snapshot_record(struct ltt_ust_session *usess, | |
5c786ded | 4982 | struct snapshot_output *output, int wait, unsigned int nb_streams) |
6dc3064a DG |
4983 | { |
4984 | int ret = 0; | |
c3c841f4 | 4985 | unsigned int snapshot_done = 0; |
6dc3064a DG |
4986 | struct lttng_ht_iter iter; |
4987 | struct ust_app *app; | |
af706bb7 | 4988 | char pathname[PATH_MAX]; |
5c786ded | 4989 | uint64_t max_stream_size = 0; |
6dc3064a DG |
4990 | |
4991 | assert(usess); | |
4992 | assert(output); | |
4993 | ||
4994 | rcu_read_lock(); | |
4995 | ||
5c786ded JD |
4996 | /* |
4997 | * Compute the maximum size of a single stream if a max size is asked by | |
4998 | * the caller. | |
4999 | */ | |
5000 | if (output->max_size > 0 && nb_streams > 0) { | |
5001 | max_stream_size = output->max_size / nb_streams; | |
5002 | } | |
5003 | ||
8c924c7b MD |
5004 | switch (usess->buffer_type) { |
5005 | case LTTNG_BUFFER_PER_UID: | |
5006 | { | |
5007 | struct buffer_reg_uid *reg; | |
6dc3064a | 5008 | |
8c924c7b MD |
5009 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
5010 | struct buffer_reg_channel *reg_chan; | |
5011 | struct consumer_socket *socket; | |
6dc3064a | 5012 | |
8c924c7b MD |
5013 | /* Get consumer socket to use to push the metadata.*/ |
5014 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
5015 | usess->consumer); | |
5016 | if (!socket) { | |
5017 | ret = -EINVAL; | |
5018 | goto error; | |
5019 | } | |
6dc3064a | 5020 | |
8c924c7b MD |
5021 | memset(pathname, 0, sizeof(pathname)); |
5022 | ret = snprintf(pathname, sizeof(pathname), | |
5023 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH, | |
5024 | reg->uid, reg->bits_per_long); | |
5025 | if (ret < 0) { | |
5026 | PERROR("snprintf snapshot path"); | |
5027 | goto error; | |
5028 | } | |
5029 | ||
5030 | /* Add the UST default trace dir to path. */ | |
5031 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
5032 | reg_chan, node.node) { | |
5033 | ||
5034 | /* | |
5035 | * Make sure the maximum stream size is not lower than the | |
5036 | * subbuffer size or else it's an error since we won't be able to | |
5037 | * snapshot anything. | |
5038 | */ | |
5039 | if (max_stream_size && | |
5040 | reg_chan->subbuf_size > max_stream_size) { | |
5041 | ret = -EINVAL; | |
5042 | DBG3("UST app snapshot record maximum stream size %" PRIu64 | |
6a00837f | 5043 | " is smaller than subbuffer size of %zu", |
8c924c7b MD |
5044 | max_stream_size, reg_chan->subbuf_size); |
5045 | goto error; | |
5046 | } | |
5047 | ret = consumer_snapshot_channel(socket, reg_chan->consumer_key, output, 0, | |
5048 | usess->uid, usess->gid, pathname, wait, | |
5049 | max_stream_size); | |
5050 | if (ret < 0) { | |
5051 | goto error; | |
5052 | } | |
5053 | } | |
5054 | ret = consumer_snapshot_channel(socket, reg->registry->reg.ust->metadata_key, output, | |
5055 | 1, usess->uid, usess->gid, pathname, wait, | |
5056 | max_stream_size); | |
5057 | if (ret < 0) { | |
5058 | goto error; | |
5059 | } | |
c3c841f4 | 5060 | snapshot_done = 1; |
af706bb7 | 5061 | } |
8c924c7b MD |
5062 | break; |
5063 | } | |
5064 | case LTTNG_BUFFER_PER_PID: | |
5065 | { | |
5066 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5067 | struct consumer_socket *socket; | |
5068 | struct lttng_ht_iter chan_iter; | |
5069 | struct ust_app_channel *ua_chan; | |
5070 | struct ust_app_session *ua_sess; | |
5071 | struct ust_registry_session *registry; | |
5072 | ||
5073 | ua_sess = lookup_session_by_app(usess, app); | |
5074 | if (!ua_sess) { | |
5075 | /* Session not associated with this app. */ | |
5076 | continue; | |
5077 | } | |
af706bb7 | 5078 | |
8c924c7b MD |
5079 | /* Get the right consumer socket for the application. */ |
5080 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
5081 | output->consumer); | |
5082 | if (!socket) { | |
5c786ded | 5083 | ret = -EINVAL; |
5c786ded JD |
5084 | goto error; |
5085 | } | |
5086 | ||
8c924c7b MD |
5087 | /* Add the UST default trace dir to path. */ |
5088 | memset(pathname, 0, sizeof(pathname)); | |
5089 | ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "/%s", | |
5090 | ua_sess->path); | |
6dc3064a | 5091 | if (ret < 0) { |
8c924c7b | 5092 | PERROR("snprintf snapshot path"); |
6dc3064a DG |
5093 | goto error; |
5094 | } | |
6dc3064a | 5095 | |
8c924c7b MD |
5096 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, |
5097 | ua_chan, node.node) { | |
5098 | /* | |
5099 | * Make sure the maximum stream size is not lower than the | |
5100 | * subbuffer size or else it's an error since we won't be able to | |
5101 | * snapshot anything. | |
5102 | */ | |
5103 | if (max_stream_size && | |
5104 | ua_chan->attr.subbuf_size > max_stream_size) { | |
5105 | ret = -EINVAL; | |
5106 | DBG3("UST app snapshot record maximum stream size %" PRIu64 | |
5107 | " is smaller than subbuffer size of %" PRIu64, | |
5108 | max_stream_size, ua_chan->attr.subbuf_size); | |
5109 | goto error; | |
5110 | } | |
6dc3064a | 5111 | |
8c924c7b MD |
5112 | ret = consumer_snapshot_channel(socket, ua_chan->key, output, 0, |
5113 | ua_sess->euid, ua_sess->egid, pathname, wait, | |
5114 | max_stream_size); | |
5115 | if (ret < 0) { | |
5116 | goto error; | |
5117 | } | |
5118 | } | |
5119 | ||
5120 | registry = get_session_registry(ua_sess); | |
5121 | assert(registry); | |
5122 | ret = consumer_snapshot_channel(socket, registry->metadata_key, output, | |
5123 | 1, ua_sess->euid, ua_sess->egid, pathname, wait, | |
5124 | max_stream_size); | |
5125 | if (ret < 0) { | |
5126 | goto error; | |
5127 | } | |
c3c841f4 | 5128 | snapshot_done = 1; |
8c924c7b MD |
5129 | } |
5130 | break; | |
5131 | } | |
5132 | default: | |
5133 | assert(0); | |
5134 | break; | |
6dc3064a DG |
5135 | } |
5136 | ||
c3c841f4 DG |
5137 | if (!snapshot_done) { |
5138 | /* | |
5139 | * If no snapshot was made and we are not in the error path, this means | |
5140 | * that there are no buffers thus no (prior) application to snapshot | |
5141 | * data from so we have simply NO data. | |
5142 | */ | |
5143 | ret = -ENODATA; | |
5144 | } | |
5145 | ||
6dc3064a DG |
5146 | error: |
5147 | rcu_read_unlock(); | |
5148 | return ret; | |
5149 | } | |
5c786ded JD |
5150 | |
5151 | /* | |
5152 | * Return the number of streams for a UST session. | |
5153 | */ | |
5154 | unsigned int ust_app_get_nb_stream(struct ltt_ust_session *usess) | |
5155 | { | |
5156 | unsigned int ret = 0; | |
5157 | struct ust_app *app; | |
5158 | struct lttng_ht_iter iter; | |
5159 | ||
5160 | assert(usess); | |
5161 | ||
5162 | switch (usess->buffer_type) { | |
5163 | case LTTNG_BUFFER_PER_UID: | |
5164 | { | |
5165 | struct buffer_reg_uid *reg; | |
5166 | ||
5167 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
5168 | struct buffer_reg_channel *reg_chan; | |
5169 | ||
19152ffe | 5170 | rcu_read_lock(); |
5c786ded JD |
5171 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
5172 | reg_chan, node.node) { | |
5173 | ret += reg_chan->stream_count; | |
5174 | } | |
19152ffe | 5175 | rcu_read_unlock(); |
5c786ded JD |
5176 | } |
5177 | break; | |
5178 | } | |
5179 | case LTTNG_BUFFER_PER_PID: | |
5180 | { | |
5181 | rcu_read_lock(); | |
5182 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5183 | struct ust_app_channel *ua_chan; | |
5184 | struct ust_app_session *ua_sess; | |
5185 | struct lttng_ht_iter chan_iter; | |
5186 | ||
5187 | ua_sess = lookup_session_by_app(usess, app); | |
5188 | if (!ua_sess) { | |
5189 | /* Session not associated with this app. */ | |
5190 | continue; | |
5191 | } | |
5192 | ||
5193 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
5194 | ua_chan, node.node) { | |
5195 | ret += ua_chan->streams.count; | |
5196 | } | |
5197 | } | |
5198 | rcu_read_unlock(); | |
5199 | break; | |
5200 | } | |
5201 | default: | |
5202 | assert(0); | |
5203 | break; | |
5204 | } | |
5205 | ||
5206 | return ret; | |
5207 | } |