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 | |
6c1c0768 | 19 | #define _LGPL_SOURCE |
91d76f53 | 20 | #include <errno.h> |
7972aab2 | 21 | #include <inttypes.h> |
91d76f53 DG |
22 | #include <pthread.h> |
23 | #include <stdio.h> | |
24 | #include <stdlib.h> | |
099e26bd | 25 | #include <string.h> |
aba8e916 DG |
26 | #include <sys/stat.h> |
27 | #include <sys/types.h> | |
099e26bd | 28 | #include <unistd.h> |
0df502fd | 29 | #include <urcu/compiler.h> |
fb54cdbf | 30 | #include <lttng/ust-error.h> |
331744e3 | 31 | #include <signal.h> |
bec39940 | 32 | |
990570ed | 33 | #include <common/common.h> |
86acf0da | 34 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 35 | |
7972aab2 | 36 | #include "buffer-registry.h" |
86acf0da | 37 | #include "fd-limit.h" |
8782cc74 | 38 | #include "health-sessiond.h" |
56fff090 | 39 | #include "ust-app.h" |
48842b30 | 40 | #include "ust-consumer.h" |
d80a6244 | 41 | #include "ust-ctl.h" |
0b2dc8df | 42 | #include "utils.h" |
d80a6244 | 43 | |
c4b88406 MD |
44 | static |
45 | int ust_app_flush_app_session(struct ust_app *app, struct ust_app_session *ua_sess); | |
46 | ||
d9bf3ca4 MD |
47 | /* Next available channel key. Access under next_channel_key_lock. */ |
48 | static uint64_t _next_channel_key; | |
49 | static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER; | |
50 | ||
51 | /* Next available session ID. Access under next_session_id_lock. */ | |
52 | static uint64_t _next_session_id; | |
53 | static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER; | |
ffe60014 DG |
54 | |
55 | /* | |
d9bf3ca4 | 56 | * Return the incremented value of next_channel_key. |
ffe60014 | 57 | */ |
d9bf3ca4 | 58 | static uint64_t get_next_channel_key(void) |
ffe60014 | 59 | { |
d9bf3ca4 MD |
60 | uint64_t ret; |
61 | ||
62 | pthread_mutex_lock(&next_channel_key_lock); | |
63 | ret = ++_next_channel_key; | |
64 | pthread_mutex_unlock(&next_channel_key_lock); | |
65 | return ret; | |
ffe60014 DG |
66 | } |
67 | ||
68 | /* | |
7972aab2 | 69 | * Return the atomically incremented value of next_session_id. |
ffe60014 | 70 | */ |
d9bf3ca4 | 71 | static uint64_t get_next_session_id(void) |
ffe60014 | 72 | { |
d9bf3ca4 MD |
73 | uint64_t ret; |
74 | ||
75 | pthread_mutex_lock(&next_session_id_lock); | |
76 | ret = ++_next_session_id; | |
77 | pthread_mutex_unlock(&next_session_id_lock); | |
78 | return ret; | |
ffe60014 DG |
79 | } |
80 | ||
d65d2de8 DG |
81 | static void copy_channel_attr_to_ustctl( |
82 | struct ustctl_consumer_channel_attr *attr, | |
83 | struct lttng_ust_channel_attr *uattr) | |
84 | { | |
85 | /* Copy event attributes since the layout is different. */ | |
86 | attr->subbuf_size = uattr->subbuf_size; | |
87 | attr->num_subbuf = uattr->num_subbuf; | |
88 | attr->overwrite = uattr->overwrite; | |
89 | attr->switch_timer_interval = uattr->switch_timer_interval; | |
90 | attr->read_timer_interval = uattr->read_timer_interval; | |
91 | attr->output = uattr->output; | |
92 | } | |
93 | ||
025faf73 DG |
94 | /* |
95 | * Match function for the hash table lookup. | |
96 | * | |
97 | * It matches an ust app event based on three attributes which are the event | |
98 | * name, the filter bytecode and the loglevel. | |
99 | */ | |
18eace3b DG |
100 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
101 | { | |
102 | struct ust_app_event *event; | |
103 | const struct ust_app_ht_key *key; | |
104 | ||
105 | assert(node); | |
106 | assert(_key); | |
107 | ||
108 | event = caa_container_of(node, struct ust_app_event, node.node); | |
109 | key = _key; | |
110 | ||
1af53eb5 | 111 | /* Match the 4 elements of the key: name, filter, loglevel, exclusions */ |
18eace3b DG |
112 | |
113 | /* Event name */ | |
114 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
115 | goto no_match; | |
116 | } | |
117 | ||
118 | /* Event loglevel. */ | |
119 | if (event->attr.loglevel != key->loglevel) { | |
025faf73 DG |
120 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
121 | && key->loglevel == 0 && event->attr.loglevel == -1) { | |
122 | /* | |
123 | * Match is accepted. This is because on event creation, the | |
124 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
125 | * -1 are accepted for this loglevel type since 0 is the one set by | |
126 | * the API when receiving an enable event. | |
127 | */ | |
128 | } else { | |
129 | goto no_match; | |
130 | } | |
18eace3b DG |
131 | } |
132 | ||
133 | /* One of the filters is NULL, fail. */ | |
134 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
135 | goto no_match; | |
136 | } | |
137 | ||
025faf73 DG |
138 | if (key->filter && event->filter) { |
139 | /* Both filters exists, check length followed by the bytecode. */ | |
140 | if (event->filter->len != key->filter->len || | |
141 | memcmp(event->filter->data, key->filter->data, | |
142 | event->filter->len) != 0) { | |
143 | goto no_match; | |
144 | } | |
18eace3b DG |
145 | } |
146 | ||
1af53eb5 JI |
147 | /* One of the exclusions is NULL, fail. */ |
148 | if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) { | |
149 | goto no_match; | |
150 | } | |
151 | ||
152 | if (key->exclusion && event->exclusion) { | |
153 | /* Both exclusions exists, check count followed by the names. */ | |
154 | if (event->exclusion->count != key->exclusion->count || | |
155 | memcmp(event->exclusion->names, key->exclusion->names, | |
156 | event->exclusion->count * LTTNG_UST_SYM_NAME_LEN) != 0) { | |
157 | goto no_match; | |
158 | } | |
159 | } | |
160 | ||
161 | ||
025faf73 | 162 | /* Match. */ |
18eace3b DG |
163 | return 1; |
164 | ||
165 | no_match: | |
166 | return 0; | |
18eace3b DG |
167 | } |
168 | ||
025faf73 DG |
169 | /* |
170 | * Unique add of an ust app event in the given ht. This uses the custom | |
171 | * ht_match_ust_app_event match function and the event name as hash. | |
172 | */ | |
d0b96690 | 173 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
174 | struct ust_app_event *event) |
175 | { | |
176 | struct cds_lfht_node *node_ptr; | |
177 | struct ust_app_ht_key key; | |
d0b96690 | 178 | struct lttng_ht *ht; |
18eace3b | 179 | |
d0b96690 DG |
180 | assert(ua_chan); |
181 | assert(ua_chan->events); | |
18eace3b DG |
182 | assert(event); |
183 | ||
d0b96690 | 184 | ht = ua_chan->events; |
18eace3b DG |
185 | key.name = event->attr.name; |
186 | key.filter = event->filter; | |
187 | key.loglevel = event->attr.loglevel; | |
91c89f23 | 188 | key.exclusion = event->exclusion; |
18eace3b DG |
189 | |
190 | node_ptr = cds_lfht_add_unique(ht->ht, | |
191 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
192 | ht_match_ust_app_event, &key, &event->node.node); | |
193 | assert(node_ptr == &event->node.node); | |
194 | } | |
195 | ||
d88aee68 DG |
196 | /* |
197 | * Close the notify socket from the given RCU head object. This MUST be called | |
198 | * through a call_rcu(). | |
199 | */ | |
200 | static void close_notify_sock_rcu(struct rcu_head *head) | |
201 | { | |
202 | int ret; | |
203 | struct ust_app_notify_sock_obj *obj = | |
204 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
205 | ||
206 | /* Must have a valid fd here. */ | |
207 | assert(obj->fd >= 0); | |
208 | ||
209 | ret = close(obj->fd); | |
210 | if (ret) { | |
211 | ERR("close notify sock %d RCU", obj->fd); | |
212 | } | |
213 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
214 | ||
215 | free(obj); | |
216 | } | |
217 | ||
7972aab2 DG |
218 | /* |
219 | * Return the session registry according to the buffer type of the given | |
220 | * session. | |
221 | * | |
222 | * A registry per UID object MUST exists before calling this function or else | |
223 | * it assert() if not found. RCU read side lock must be acquired. | |
224 | */ | |
225 | static struct ust_registry_session *get_session_registry( | |
226 | struct ust_app_session *ua_sess) | |
227 | { | |
228 | struct ust_registry_session *registry = NULL; | |
229 | ||
230 | assert(ua_sess); | |
231 | ||
232 | switch (ua_sess->buffer_type) { | |
233 | case LTTNG_BUFFER_PER_PID: | |
234 | { | |
235 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
236 | if (!reg_pid) { | |
237 | goto error; | |
238 | } | |
239 | registry = reg_pid->registry->reg.ust; | |
240 | break; | |
241 | } | |
242 | case LTTNG_BUFFER_PER_UID: | |
243 | { | |
244 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
245 | ua_sess->tracing_id, ua_sess->bits_per_long, ua_sess->uid); | |
246 | if (!reg_uid) { | |
247 | goto error; | |
248 | } | |
249 | registry = reg_uid->registry->reg.ust; | |
250 | break; | |
251 | } | |
252 | default: | |
253 | assert(0); | |
254 | }; | |
255 | ||
256 | error: | |
257 | return registry; | |
258 | } | |
259 | ||
55cc08a6 DG |
260 | /* |
261 | * Delete ust context safely. RCU read lock must be held before calling | |
262 | * this function. | |
263 | */ | |
264 | static | |
265 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx) | |
266 | { | |
ffe60014 DG |
267 | int ret; |
268 | ||
269 | assert(ua_ctx); | |
270 | ||
55cc08a6 | 271 | if (ua_ctx->obj) { |
ffe60014 | 272 | ret = ustctl_release_object(sock, ua_ctx->obj); |
d0b96690 DG |
273 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
274 | ERR("UST app sock %d release ctx obj handle %d failed with ret %d", | |
275 | sock, ua_ctx->obj->handle, ret); | |
ffe60014 | 276 | } |
55cc08a6 DG |
277 | free(ua_ctx->obj); |
278 | } | |
279 | free(ua_ctx); | |
280 | } | |
281 | ||
d80a6244 DG |
282 | /* |
283 | * Delete ust app event safely. RCU read lock must be held before calling | |
284 | * this function. | |
285 | */ | |
8b366481 DG |
286 | static |
287 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event) | |
d80a6244 | 288 | { |
ffe60014 DG |
289 | int ret; |
290 | ||
291 | assert(ua_event); | |
292 | ||
53a80697 | 293 | free(ua_event->filter); |
951f0b71 JI |
294 | if (ua_event->exclusion != NULL) |
295 | free(ua_event->exclusion); | |
edb67388 | 296 | if (ua_event->obj != NULL) { |
ffe60014 DG |
297 | ret = ustctl_release_object(sock, ua_event->obj); |
298 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
299 | ERR("UST app sock %d release event obj failed with ret %d", | |
300 | sock, ret); | |
301 | } | |
edb67388 DG |
302 | free(ua_event->obj); |
303 | } | |
d80a6244 DG |
304 | free(ua_event); |
305 | } | |
306 | ||
307 | /* | |
7972aab2 DG |
308 | * Release ust data object of the given stream. |
309 | * | |
310 | * Return 0 on success or else a negative value. | |
d80a6244 | 311 | */ |
7972aab2 | 312 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream) |
d80a6244 | 313 | { |
7972aab2 | 314 | int ret = 0; |
ffe60014 DG |
315 | |
316 | assert(stream); | |
317 | ||
8b366481 | 318 | if (stream->obj) { |
ffe60014 DG |
319 | ret = ustctl_release_object(sock, stream->obj); |
320 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
321 | ERR("UST app sock %d release stream obj failed with ret %d", | |
322 | sock, ret); | |
323 | } | |
4063050c | 324 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
325 | free(stream->obj); |
326 | } | |
7972aab2 DG |
327 | |
328 | return ret; | |
329 | } | |
330 | ||
331 | /* | |
332 | * Delete ust app stream safely. RCU read lock must be held before calling | |
333 | * this function. | |
334 | */ | |
335 | static | |
336 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream) | |
337 | { | |
338 | assert(stream); | |
339 | ||
340 | (void) release_ust_app_stream(sock, stream); | |
84cd17c6 | 341 | free(stream); |
d80a6244 DG |
342 | } |
343 | ||
36b588ed MD |
344 | /* |
345 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
346 | * section and outside of call_rcu thread, so we postpone its execution |
347 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
348 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
349 | */ |
350 | static | |
351 | void delete_ust_app_channel_rcu(struct rcu_head *head) | |
352 | { | |
353 | struct ust_app_channel *ua_chan = | |
354 | caa_container_of(head, struct ust_app_channel, rcu_head); | |
355 | ||
0b2dc8df MD |
356 | ht_cleanup_push(ua_chan->ctx); |
357 | ht_cleanup_push(ua_chan->events); | |
36b588ed MD |
358 | free(ua_chan); |
359 | } | |
360 | ||
d80a6244 DG |
361 | /* |
362 | * Delete ust app channel safely. RCU read lock must be held before calling | |
363 | * this function. | |
364 | */ | |
8b366481 | 365 | static |
d0b96690 DG |
366 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
367 | struct ust_app *app) | |
d80a6244 DG |
368 | { |
369 | int ret; | |
bec39940 | 370 | struct lttng_ht_iter iter; |
d80a6244 | 371 | struct ust_app_event *ua_event; |
55cc08a6 | 372 | struct ust_app_ctx *ua_ctx; |
030a66fa | 373 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 374 | struct ust_registry_session *registry; |
d80a6244 | 375 | |
ffe60014 DG |
376 | assert(ua_chan); |
377 | ||
378 | DBG3("UST app deleting channel %s", ua_chan->name); | |
379 | ||
55cc08a6 | 380 | /* Wipe stream */ |
d80a6244 | 381 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 382 | cds_list_del(&stream->list); |
d80a6244 DG |
383 | delete_ust_app_stream(sock, stream); |
384 | } | |
385 | ||
55cc08a6 | 386 | /* Wipe context */ |
bec39940 | 387 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
31746f93 | 388 | cds_list_del(&ua_ctx->list); |
bec39940 | 389 | ret = lttng_ht_del(ua_chan->ctx, &iter); |
55cc08a6 DG |
390 | assert(!ret); |
391 | delete_ust_app_ctx(sock, ua_ctx); | |
392 | } | |
d80a6244 | 393 | |
55cc08a6 | 394 | /* Wipe events */ |
bec39940 DG |
395 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
396 | node.node) { | |
397 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 398 | assert(!ret); |
d80a6244 DG |
399 | delete_ust_app_event(sock, ua_event); |
400 | } | |
edb67388 | 401 | |
c8335706 MD |
402 | if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) { |
403 | /* Wipe and free registry from session registry. */ | |
404 | registry = get_session_registry(ua_chan->session); | |
405 | if (registry) { | |
406 | ust_registry_channel_del_free(registry, ua_chan->key); | |
407 | } | |
7972aab2 | 408 | } |
d0b96690 | 409 | |
edb67388 | 410 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
411 | /* Remove channel from application UST object descriptor. */ |
412 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
c6e62271 DG |
413 | ret = lttng_ht_del(app->ust_objd, &iter); |
414 | assert(!ret); | |
ffe60014 DG |
415 | ret = ustctl_release_object(sock, ua_chan->obj); |
416 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
417 | ERR("UST app sock %d release channel obj failed with ret %d", | |
418 | sock, ret); | |
419 | } | |
7972aab2 | 420 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
421 | free(ua_chan->obj); |
422 | } | |
36b588ed | 423 | call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); |
d80a6244 DG |
424 | } |
425 | ||
331744e3 | 426 | /* |
1b532a60 DG |
427 | * Push metadata to consumer socket. |
428 | * | |
429 | * The socket lock MUST be acquired. | |
430 | * The ust app session lock MUST be acquired. | |
331744e3 JD |
431 | * |
432 | * On success, return the len of metadata pushed or else a negative value. | |
433 | */ | |
434 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
435 | struct consumer_socket *socket, int send_zero_data) | |
436 | { | |
437 | int ret; | |
438 | char *metadata_str = NULL; | |
439 | size_t len, offset; | |
440 | ssize_t ret_val; | |
441 | ||
442 | assert(registry); | |
443 | assert(socket); | |
1b532a60 | 444 | |
ce34fcd0 MD |
445 | pthread_mutex_lock(®istry->lock); |
446 | ||
447 | /* | |
448 | * Means that no metadata was assigned to the session. This can happens if | |
449 | * no start has been done previously. | |
450 | */ | |
451 | if (!registry->metadata_key) { | |
452 | pthread_mutex_unlock(®istry->lock); | |
453 | return 0; | |
454 | } | |
455 | ||
1b532a60 DG |
456 | /* |
457 | * On a push metadata error either the consumer is dead or the metadata | |
458 | * channel has been destroyed because its endpoint might have died (e.g: | |
459 | * relayd). If so, the metadata closed flag is set to 1 so we deny pushing | |
460 | * metadata again which is not valid anymore on the consumer side. | |
1b532a60 DG |
461 | */ |
462 | if (registry->metadata_closed) { | |
ce34fcd0 | 463 | pthread_mutex_unlock(®istry->lock); |
1b532a60 DG |
464 | return -EPIPE; |
465 | } | |
331744e3 | 466 | |
331744e3 JD |
467 | offset = registry->metadata_len_sent; |
468 | len = registry->metadata_len - registry->metadata_len_sent; | |
469 | if (len == 0) { | |
470 | DBG3("No metadata to push for metadata key %" PRIu64, | |
471 | registry->metadata_key); | |
472 | ret_val = len; | |
473 | if (send_zero_data) { | |
474 | DBG("No metadata to push"); | |
475 | goto push_data; | |
476 | } | |
477 | goto end; | |
478 | } | |
479 | ||
480 | /* Allocate only what we have to send. */ | |
481 | metadata_str = zmalloc(len); | |
482 | if (!metadata_str) { | |
483 | PERROR("zmalloc ust app metadata string"); | |
484 | ret_val = -ENOMEM; | |
485 | goto error; | |
486 | } | |
487 | /* Copy what we haven't send out. */ | |
488 | memcpy(metadata_str, registry->metadata + offset, len); | |
489 | registry->metadata_len_sent += len; | |
490 | ||
491 | push_data: | |
492 | pthread_mutex_unlock(®istry->lock); | |
493 | ret = consumer_push_metadata(socket, registry->metadata_key, | |
494 | metadata_str, len, offset); | |
495 | if (ret < 0) { | |
000baf6a DG |
496 | /* |
497 | * There is an acceptable race here between the registry metadata key | |
498 | * assignment and the creation on the consumer. The session daemon can | |
499 | * concurrently push metadata for this registry while being created on | |
500 | * the consumer since the metadata key of the registry is assigned | |
501 | * *before* it is setup to avoid the consumer to ask for metadata that | |
502 | * could possibly be not found in the session daemon. | |
503 | * | |
504 | * The metadata will get pushed either by the session being stopped or | |
505 | * the consumer requesting metadata if that race is triggered. | |
506 | */ | |
507 | if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) { | |
508 | ret = 0; | |
509 | } | |
ffa3f245 DG |
510 | |
511 | /* Update back the actual metadata len sent since it failed here. */ | |
512 | pthread_mutex_lock(®istry->lock); | |
513 | registry->metadata_len_sent -= len; | |
514 | pthread_mutex_unlock(®istry->lock); | |
331744e3 JD |
515 | ret_val = ret; |
516 | goto error_push; | |
517 | } | |
518 | ||
519 | free(metadata_str); | |
520 | return len; | |
521 | ||
522 | end: | |
523 | error: | |
ce34fcd0 MD |
524 | if (ret_val) { |
525 | /* | |
526 | * On error, flag the registry that the metadata is closed. We were unable | |
527 | * to push anything and this means that either the consumer is not | |
528 | * responding or the metadata cache has been destroyed on the consumer. | |
529 | */ | |
530 | registry->metadata_closed = 1; | |
531 | } | |
331744e3 JD |
532 | pthread_mutex_unlock(®istry->lock); |
533 | error_push: | |
534 | free(metadata_str); | |
535 | return ret_val; | |
536 | } | |
537 | ||
d88aee68 | 538 | /* |
ce34fcd0 | 539 | * For a given application and session, push metadata to consumer. |
331744e3 JD |
540 | * Either sock or consumer is required : if sock is NULL, the default |
541 | * socket to send the metadata is retrieved from consumer, if sock | |
542 | * is not NULL we use it to send the metadata. | |
ce34fcd0 MD |
543 | * RCU read-side lock must be held while calling this function, |
544 | * therefore ensuring existance of registry. | |
d88aee68 DG |
545 | * |
546 | * Return 0 on success else a negative error. | |
547 | */ | |
7972aab2 DG |
548 | static int push_metadata(struct ust_registry_session *registry, |
549 | struct consumer_output *consumer) | |
d88aee68 | 550 | { |
331744e3 JD |
551 | int ret_val; |
552 | ssize_t ret; | |
d88aee68 DG |
553 | struct consumer_socket *socket; |
554 | ||
7972aab2 DG |
555 | assert(registry); |
556 | assert(consumer); | |
557 | ||
ce34fcd0 | 558 | pthread_mutex_lock(®istry->lock); |
d88aee68 | 559 | |
ce34fcd0 MD |
560 | if (registry->metadata_closed) { |
561 | pthread_mutex_unlock(®istry->lock); | |
562 | return -EPIPE; | |
d88aee68 DG |
563 | } |
564 | ||
d88aee68 | 565 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
566 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
567 | consumer); | |
ce34fcd0 | 568 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 569 | if (!socket) { |
331744e3 | 570 | ret_val = -1; |
ce34fcd0 | 571 | goto error; |
d88aee68 DG |
572 | } |
573 | ||
574 | /* | |
575 | * TODO: Currently, we hold the socket lock around sampling of the next | |
576 | * metadata segment to ensure we send metadata over the consumer socket in | |
577 | * the correct order. This makes the registry lock nest inside the socket | |
578 | * lock. | |
579 | * | |
580 | * Please note that this is a temporary measure: we should move this lock | |
581 | * back into ust_consumer_push_metadata() when the consumer gets the | |
582 | * ability to reorder the metadata it receives. | |
583 | */ | |
584 | pthread_mutex_lock(socket->lock); | |
331744e3 JD |
585 | ret = ust_app_push_metadata(registry, socket, 0); |
586 | pthread_mutex_unlock(socket->lock); | |
d88aee68 | 587 | if (ret < 0) { |
331744e3 | 588 | ret_val = ret; |
ce34fcd0 | 589 | goto error; |
d88aee68 DG |
590 | } |
591 | ||
d88aee68 DG |
592 | return 0; |
593 | ||
ce34fcd0 MD |
594 | error: |
595 | end: | |
331744e3 | 596 | return ret_val; |
d88aee68 DG |
597 | } |
598 | ||
599 | /* | |
600 | * Send to the consumer a close metadata command for the given session. Once | |
601 | * done, the metadata channel is deleted and the session metadata pointer is | |
602 | * nullified. The session lock MUST be acquired here unless the application is | |
603 | * in the destroy path. | |
604 | * | |
605 | * Return 0 on success else a negative value. | |
606 | */ | |
7972aab2 DG |
607 | static int close_metadata(struct ust_registry_session *registry, |
608 | struct consumer_output *consumer) | |
d88aee68 DG |
609 | { |
610 | int ret; | |
611 | struct consumer_socket *socket; | |
612 | ||
7972aab2 DG |
613 | assert(registry); |
614 | assert(consumer); | |
d88aee68 | 615 | |
7972aab2 DG |
616 | rcu_read_lock(); |
617 | ||
ce34fcd0 MD |
618 | pthread_mutex_lock(®istry->lock); |
619 | ||
7972aab2 | 620 | if (!registry->metadata_key || registry->metadata_closed) { |
d88aee68 | 621 | ret = 0; |
1b532a60 | 622 | goto end; |
d88aee68 DG |
623 | } |
624 | ||
d88aee68 | 625 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
626 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
627 | consumer); | |
d88aee68 DG |
628 | if (!socket) { |
629 | ret = -1; | |
7972aab2 | 630 | goto error; |
d88aee68 DG |
631 | } |
632 | ||
7972aab2 | 633 | ret = consumer_close_metadata(socket, registry->metadata_key); |
d88aee68 | 634 | if (ret < 0) { |
7972aab2 | 635 | goto error; |
d88aee68 DG |
636 | } |
637 | ||
d88aee68 | 638 | error: |
1b532a60 DG |
639 | /* |
640 | * Metadata closed. Even on error this means that the consumer is not | |
641 | * responding or not found so either way a second close should NOT be emit | |
642 | * for this registry. | |
643 | */ | |
644 | registry->metadata_closed = 1; | |
645 | end: | |
ce34fcd0 | 646 | pthread_mutex_unlock(®istry->lock); |
7972aab2 | 647 | rcu_read_unlock(); |
d88aee68 DG |
648 | return ret; |
649 | } | |
650 | ||
36b588ed MD |
651 | /* |
652 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
653 | * section and outside of call_rcu thread, so we postpone its execution |
654 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
655 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
656 | */ |
657 | static | |
658 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
659 | { | |
660 | struct ust_app_session *ua_sess = | |
661 | caa_container_of(head, struct ust_app_session, rcu_head); | |
662 | ||
0b2dc8df | 663 | ht_cleanup_push(ua_sess->channels); |
36b588ed MD |
664 | free(ua_sess); |
665 | } | |
666 | ||
d80a6244 DG |
667 | /* |
668 | * Delete ust app session safely. RCU read lock must be held before calling | |
669 | * this function. | |
670 | */ | |
8b366481 | 671 | static |
d0b96690 DG |
672 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
673 | struct ust_app *app) | |
d80a6244 DG |
674 | { |
675 | int ret; | |
bec39940 | 676 | struct lttng_ht_iter iter; |
d80a6244 | 677 | struct ust_app_channel *ua_chan; |
7972aab2 | 678 | struct ust_registry_session *registry; |
d80a6244 | 679 | |
d88aee68 DG |
680 | assert(ua_sess); |
681 | ||
1b532a60 DG |
682 | pthread_mutex_lock(&ua_sess->lock); |
683 | ||
7972aab2 | 684 | registry = get_session_registry(ua_sess); |
ce34fcd0 | 685 | if (registry) { |
d88aee68 | 686 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 687 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 688 | |
7972aab2 DG |
689 | /* |
690 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
691 | * metadata only on destroy trace session in this case. Also, the |
692 | * previous push metadata could have flag the metadata registry to | |
693 | * close so don't send a close command if closed. | |
7972aab2 | 694 | */ |
ce34fcd0 | 695 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
696 | /* And ask to close it for this session registry. */ |
697 | (void) close_metadata(registry, ua_sess->consumer); | |
698 | } | |
d80a6244 DG |
699 | } |
700 | ||
bec39940 DG |
701 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
702 | node.node) { | |
703 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 704 | assert(!ret); |
d0b96690 | 705 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 706 | } |
d80a6244 | 707 | |
7972aab2 DG |
708 | /* In case of per PID, the registry is kept in the session. */ |
709 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
710 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
711 | if (reg_pid) { | |
712 | buffer_reg_pid_remove(reg_pid); | |
713 | buffer_reg_pid_destroy(reg_pid); | |
714 | } | |
715 | } | |
d0b96690 | 716 | |
aee6bafd | 717 | if (ua_sess->handle != -1) { |
ffe60014 DG |
718 | ret = ustctl_release_handle(sock, ua_sess->handle); |
719 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
720 | ERR("UST app sock %d release session handle failed with ret %d", | |
721 | sock, ret); | |
722 | } | |
aee6bafd | 723 | } |
1b532a60 DG |
724 | pthread_mutex_unlock(&ua_sess->lock); |
725 | ||
36b588ed | 726 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 727 | } |
91d76f53 DG |
728 | |
729 | /* | |
284d8f55 DG |
730 | * Delete a traceable application structure from the global list. Never call |
731 | * this function outside of a call_rcu call. | |
36b588ed MD |
732 | * |
733 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 734 | */ |
8b366481 DG |
735 | static |
736 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 737 | { |
8b366481 | 738 | int ret, sock; |
d42f20df | 739 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 740 | |
d80a6244 | 741 | /* Delete ust app sessions info */ |
852d0037 DG |
742 | sock = app->sock; |
743 | app->sock = -1; | |
d80a6244 | 744 | |
8b366481 | 745 | /* Wipe sessions */ |
d42f20df DG |
746 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
747 | teardown_node) { | |
748 | /* Free every object in the session and the session. */ | |
36b588ed | 749 | rcu_read_lock(); |
d0b96690 | 750 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 751 | rcu_read_unlock(); |
d80a6244 | 752 | } |
36b588ed | 753 | |
0b2dc8df MD |
754 | ht_cleanup_push(app->sessions); |
755 | ht_cleanup_push(app->ust_objd); | |
d80a6244 | 756 | |
6414a713 | 757 | /* |
852d0037 DG |
758 | * Wait until we have deleted the application from the sock hash table |
759 | * before closing this socket, otherwise an application could re-use the | |
760 | * socket ID and race with the teardown, using the same hash table entry. | |
761 | * | |
762 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
763 | * all RCU readers that could run concurrently with unregister app, | |
764 | * therefore we _need_ to only close that socket after a grace period. So | |
765 | * it should stay in this RCU callback. | |
766 | * | |
767 | * This close() is a very important step of the synchronization model so | |
768 | * every modification to this function must be carefully reviewed. | |
6414a713 | 769 | */ |
799e2c4f MD |
770 | ret = close(sock); |
771 | if (ret) { | |
772 | PERROR("close"); | |
773 | } | |
4063050c | 774 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 775 | |
852d0037 | 776 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 777 | free(app); |
099e26bd DG |
778 | } |
779 | ||
780 | /* | |
f6a9efaa | 781 | * URCU intermediate call to delete an UST app. |
099e26bd | 782 | */ |
8b366481 DG |
783 | static |
784 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 785 | { |
bec39940 DG |
786 | struct lttng_ht_node_ulong *node = |
787 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 788 | struct ust_app *app = |
852d0037 | 789 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 790 | |
852d0037 | 791 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 792 | delete_ust_app(app); |
099e26bd DG |
793 | } |
794 | ||
ffe60014 DG |
795 | /* |
796 | * Delete the session from the application ht and delete the data structure by | |
797 | * freeing every object inside and releasing them. | |
798 | */ | |
d0b96690 | 799 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
800 | struct ust_app_session *ua_sess) |
801 | { | |
802 | int ret; | |
803 | struct lttng_ht_iter iter; | |
804 | ||
805 | assert(app); | |
806 | assert(ua_sess); | |
807 | ||
808 | iter.iter.node = &ua_sess->node.node; | |
809 | ret = lttng_ht_del(app->sessions, &iter); | |
810 | if (ret) { | |
811 | /* Already scheduled for teardown. */ | |
812 | goto end; | |
813 | } | |
814 | ||
815 | /* Once deleted, free the data structure. */ | |
d0b96690 | 816 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
817 | |
818 | end: | |
819 | return; | |
820 | } | |
821 | ||
8b366481 DG |
822 | /* |
823 | * Alloc new UST app session. | |
824 | */ | |
825 | static | |
d0b96690 | 826 | struct ust_app_session *alloc_ust_app_session(struct ust_app *app) |
8b366481 DG |
827 | { |
828 | struct ust_app_session *ua_sess; | |
829 | ||
830 | /* Init most of the default value by allocating and zeroing */ | |
831 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
832 | if (ua_sess == NULL) { | |
833 | PERROR("malloc"); | |
ffe60014 | 834 | goto error_free; |
8b366481 DG |
835 | } |
836 | ||
837 | ua_sess->handle = -1; | |
bec39940 | 838 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
ad7a9107 | 839 | ua_sess->metadata_attr.type = LTTNG_UST_CHAN_METADATA; |
84ad93e8 | 840 | pthread_mutex_init(&ua_sess->lock, NULL); |
ad7a9107 | 841 | |
8b366481 DG |
842 | return ua_sess; |
843 | ||
ffe60014 | 844 | error_free: |
8b366481 DG |
845 | return NULL; |
846 | } | |
847 | ||
848 | /* | |
849 | * Alloc new UST app channel. | |
850 | */ | |
851 | static | |
852 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 853 | struct ust_app_session *ua_sess, |
ffe60014 | 854 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
855 | { |
856 | struct ust_app_channel *ua_chan; | |
857 | ||
858 | /* Init most of the default value by allocating and zeroing */ | |
859 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
860 | if (ua_chan == NULL) { | |
861 | PERROR("malloc"); | |
862 | goto error; | |
863 | } | |
864 | ||
865 | /* Setup channel name */ | |
866 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
867 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
868 | ||
869 | ua_chan->enabled = 1; | |
870 | ua_chan->handle = -1; | |
45893984 | 871 | ua_chan->session = ua_sess; |
ffe60014 | 872 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
873 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
874 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
875 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
876 | |
877 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
31746f93 | 878 | CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); |
8b366481 DG |
879 | |
880 | /* Copy attributes */ | |
881 | if (attr) { | |
ffe60014 | 882 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
883 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
884 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
885 | ua_chan->attr.overwrite = attr->overwrite; | |
886 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
887 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
888 | ua_chan->attr.output = attr->output; | |
8b366481 | 889 | } |
ffe60014 DG |
890 | /* By default, the channel is a per cpu channel. */ |
891 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
892 | |
893 | DBG3("UST app channel %s allocated", ua_chan->name); | |
894 | ||
895 | return ua_chan; | |
896 | ||
897 | error: | |
898 | return NULL; | |
899 | } | |
900 | ||
37f1c236 DG |
901 | /* |
902 | * Allocate and initialize a UST app stream. | |
903 | * | |
904 | * Return newly allocated stream pointer or NULL on error. | |
905 | */ | |
ffe60014 | 906 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
907 | { |
908 | struct ust_app_stream *stream = NULL; | |
909 | ||
910 | stream = zmalloc(sizeof(*stream)); | |
911 | if (stream == NULL) { | |
912 | PERROR("zmalloc ust app stream"); | |
913 | goto error; | |
914 | } | |
915 | ||
916 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
917 | stream->handle = -1; | |
918 | ||
919 | error: | |
920 | return stream; | |
921 | } | |
922 | ||
8b366481 DG |
923 | /* |
924 | * Alloc new UST app event. | |
925 | */ | |
926 | static | |
927 | struct ust_app_event *alloc_ust_app_event(char *name, | |
928 | struct lttng_ust_event *attr) | |
929 | { | |
930 | struct ust_app_event *ua_event; | |
931 | ||
932 | /* Init most of the default value by allocating and zeroing */ | |
933 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
934 | if (ua_event == NULL) { | |
935 | PERROR("malloc"); | |
936 | goto error; | |
937 | } | |
938 | ||
939 | ua_event->enabled = 1; | |
940 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
941 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 942 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
943 | |
944 | /* Copy attributes */ | |
945 | if (attr) { | |
946 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
947 | } | |
948 | ||
949 | DBG3("UST app event %s allocated", ua_event->name); | |
950 | ||
951 | return ua_event; | |
952 | ||
953 | error: | |
954 | return NULL; | |
955 | } | |
956 | ||
957 | /* | |
958 | * Alloc new UST app context. | |
959 | */ | |
960 | static | |
961 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx) | |
962 | { | |
963 | struct ust_app_ctx *ua_ctx; | |
964 | ||
965 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
966 | if (ua_ctx == NULL) { | |
967 | goto error; | |
968 | } | |
969 | ||
31746f93 DG |
970 | CDS_INIT_LIST_HEAD(&ua_ctx->list); |
971 | ||
8b366481 DG |
972 | if (uctx) { |
973 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
974 | } | |
975 | ||
976 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
977 | ||
978 | error: | |
979 | return ua_ctx; | |
980 | } | |
981 | ||
025faf73 DG |
982 | /* |
983 | * Allocate a filter and copy the given original filter. | |
984 | * | |
985 | * Return allocated filter or NULL on error. | |
986 | */ | |
987 | static struct lttng_ust_filter_bytecode *alloc_copy_ust_app_filter( | |
988 | struct lttng_ust_filter_bytecode *orig_f) | |
989 | { | |
990 | struct lttng_ust_filter_bytecode *filter = NULL; | |
991 | ||
992 | /* Copy filter bytecode */ | |
993 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
994 | if (!filter) { | |
995 | PERROR("zmalloc alloc ust app filter"); | |
996 | goto error; | |
997 | } | |
998 | ||
999 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
1000 | ||
1001 | error: | |
1002 | return filter; | |
1003 | } | |
1004 | ||
099e26bd | 1005 | /* |
421cb601 DG |
1006 | * Find an ust_app using the sock and return it. RCU read side lock must be |
1007 | * held before calling this helper function. | |
099e26bd | 1008 | */ |
f20baf8e | 1009 | struct ust_app *ust_app_find_by_sock(int sock) |
099e26bd | 1010 | { |
bec39940 | 1011 | struct lttng_ht_node_ulong *node; |
bec39940 | 1012 | struct lttng_ht_iter iter; |
f6a9efaa | 1013 | |
852d0037 | 1014 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 1015 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
1016 | if (node == NULL) { |
1017 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
1018 | goto error; |
1019 | } | |
852d0037 DG |
1020 | |
1021 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
1022 | |
1023 | error: | |
1024 | return NULL; | |
099e26bd DG |
1025 | } |
1026 | ||
d0b96690 DG |
1027 | /* |
1028 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
1029 | * be held before calling this helper function. | |
1030 | */ | |
1031 | static struct ust_app *find_app_by_notify_sock(int sock) | |
1032 | { | |
1033 | struct lttng_ht_node_ulong *node; | |
1034 | struct lttng_ht_iter iter; | |
1035 | ||
1036 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
1037 | &iter); | |
1038 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1039 | if (node == NULL) { | |
1040 | DBG2("UST app find by notify sock %d not found", sock); | |
1041 | goto error; | |
1042 | } | |
1043 | ||
1044 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
1045 | ||
1046 | error: | |
1047 | return NULL; | |
1048 | } | |
1049 | ||
025faf73 DG |
1050 | /* |
1051 | * Lookup for an ust app event based on event name, filter bytecode and the | |
1052 | * event loglevel. | |
1053 | * | |
1054 | * Return an ust_app_event object or NULL on error. | |
1055 | */ | |
18eace3b | 1056 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
39c5a3a7 JI |
1057 | char *name, struct lttng_ust_filter_bytecode *filter, int loglevel, |
1058 | const struct lttng_event_exclusion *exclusion) | |
18eace3b DG |
1059 | { |
1060 | struct lttng_ht_iter iter; | |
1061 | struct lttng_ht_node_str *node; | |
1062 | struct ust_app_event *event = NULL; | |
1063 | struct ust_app_ht_key key; | |
18eace3b DG |
1064 | |
1065 | assert(name); | |
1066 | assert(ht); | |
1067 | ||
1068 | /* Setup key for event lookup. */ | |
1069 | key.name = name; | |
1070 | key.filter = filter; | |
1071 | key.loglevel = loglevel; | |
39c5a3a7 JI |
1072 | /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */ |
1073 | key.exclusion = (struct lttng_ust_event_exclusion *)exclusion; | |
18eace3b | 1074 | |
025faf73 DG |
1075 | /* Lookup using the event name as hash and a custom match fct. */ |
1076 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1077 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1078 | node = lttng_ht_iter_get_node_str(&iter); |
1079 | if (node == NULL) { | |
1080 | goto end; | |
1081 | } | |
1082 | ||
1083 | event = caa_container_of(node, struct ust_app_event, node); | |
1084 | ||
1085 | end: | |
18eace3b DG |
1086 | return event; |
1087 | } | |
1088 | ||
55cc08a6 DG |
1089 | /* |
1090 | * Create the channel context on the tracer. | |
d0b96690 DG |
1091 | * |
1092 | * Called with UST app session lock held. | |
55cc08a6 DG |
1093 | */ |
1094 | static | |
1095 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1096 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1097 | { | |
1098 | int ret; | |
1099 | ||
840cb59c | 1100 | health_code_update(); |
86acf0da | 1101 | |
852d0037 | 1102 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 DG |
1103 | ua_chan->obj, &ua_ctx->obj); |
1104 | if (ret < 0) { | |
ffe60014 DG |
1105 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1106 | ERR("UST app create channel context failed for app (pid: %d) " | |
1107 | "with ret %d", app->pid, ret); | |
1108 | } else { | |
3757b385 DG |
1109 | /* |
1110 | * This is normal behavior, an application can die during the | |
1111 | * creation process. Don't report an error so the execution can | |
1112 | * continue normally. | |
1113 | */ | |
1114 | ret = 0; | |
ffe60014 DG |
1115 | DBG3("UST app disable event failed. Application is dead."); |
1116 | } | |
55cc08a6 DG |
1117 | goto error; |
1118 | } | |
1119 | ||
1120 | ua_ctx->handle = ua_ctx->obj->handle; | |
1121 | ||
d0b96690 DG |
1122 | DBG2("UST app context handle %d created successfully for channel %s", |
1123 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1124 | |
1125 | error: | |
840cb59c | 1126 | health_code_update(); |
55cc08a6 DG |
1127 | return ret; |
1128 | } | |
1129 | ||
53a80697 MD |
1130 | /* |
1131 | * Set the filter on the tracer. | |
1132 | */ | |
1133 | static | |
1134 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
1135 | struct ust_app *app) | |
1136 | { | |
1137 | int ret; | |
1138 | ||
840cb59c | 1139 | health_code_update(); |
86acf0da | 1140 | |
53a80697 | 1141 | if (!ua_event->filter) { |
86acf0da DG |
1142 | ret = 0; |
1143 | goto error; | |
53a80697 MD |
1144 | } |
1145 | ||
1146 | ret = ustctl_set_filter(app->sock, ua_event->filter, | |
1147 | ua_event->obj); | |
1148 | if (ret < 0) { | |
ffe60014 DG |
1149 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1150 | ERR("UST app event %s filter failed for app (pid: %d) " | |
1151 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1152 | } else { | |
3757b385 DG |
1153 | /* |
1154 | * This is normal behavior, an application can die during the | |
1155 | * creation process. Don't report an error so the execution can | |
1156 | * continue normally. | |
1157 | */ | |
1158 | ret = 0; | |
ffe60014 DG |
1159 | DBG3("UST app filter event failed. Application is dead."); |
1160 | } | |
53a80697 MD |
1161 | goto error; |
1162 | } | |
1163 | ||
1164 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
1165 | ||
1166 | error: | |
840cb59c | 1167 | health_code_update(); |
53a80697 MD |
1168 | return ret; |
1169 | } | |
1170 | ||
7cc9a73c JI |
1171 | /* |
1172 | * Set event exclusions on the tracer. | |
1173 | */ | |
1174 | static | |
1175 | int set_ust_event_exclusion(struct ust_app_event *ua_event, | |
1176 | struct ust_app *app) | |
1177 | { | |
1178 | int ret; | |
1179 | ||
1180 | health_code_update(); | |
1181 | ||
1182 | if (!ua_event->exclusion || !ua_event->exclusion->count) { | |
1183 | ret = 0; | |
1184 | goto error; | |
1185 | } | |
1186 | ||
1187 | ret = ustctl_set_exclusion(app->sock, ua_event->exclusion, | |
1188 | ua_event->obj); | |
1189 | if (ret < 0) { | |
1190 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1191 | ERR("UST app event %s exclusions failed for app (pid: %d) " | |
1192 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1193 | } else { | |
1194 | /* | |
1195 | * This is normal behavior, an application can die during the | |
1196 | * creation process. Don't report an error so the execution can | |
1197 | * continue normally. | |
1198 | */ | |
1199 | ret = 0; | |
1200 | DBG3("UST app event exclusion failed. Application is dead."); | |
1201 | } | |
1202 | goto error; | |
1203 | } | |
1204 | ||
1205 | DBG2("UST exclusion set successfully for event %s", ua_event->name); | |
1206 | ||
1207 | error: | |
1208 | health_code_update(); | |
1209 | return ret; | |
1210 | } | |
1211 | ||
9730260e DG |
1212 | /* |
1213 | * Disable the specified event on to UST tracer for the UST session. | |
1214 | */ | |
1215 | static int disable_ust_event(struct ust_app *app, | |
1216 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1217 | { | |
1218 | int ret; | |
1219 | ||
840cb59c | 1220 | health_code_update(); |
86acf0da | 1221 | |
852d0037 | 1222 | ret = ustctl_disable(app->sock, ua_event->obj); |
9730260e | 1223 | if (ret < 0) { |
ffe60014 DG |
1224 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1225 | ERR("UST app event %s disable failed for app (pid: %d) " | |
1226 | "and session handle %d with ret %d", | |
1227 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1228 | } else { | |
3757b385 DG |
1229 | /* |
1230 | * This is normal behavior, an application can die during the | |
1231 | * creation process. Don't report an error so the execution can | |
1232 | * continue normally. | |
1233 | */ | |
1234 | ret = 0; | |
ffe60014 DG |
1235 | DBG3("UST app disable event failed. Application is dead."); |
1236 | } | |
9730260e DG |
1237 | goto error; |
1238 | } | |
1239 | ||
1240 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 1241 | ua_event->attr.name, app->pid); |
9730260e DG |
1242 | |
1243 | error: | |
840cb59c | 1244 | health_code_update(); |
9730260e DG |
1245 | return ret; |
1246 | } | |
1247 | ||
78f0bacd DG |
1248 | /* |
1249 | * Disable the specified channel on to UST tracer for the UST session. | |
1250 | */ | |
1251 | static int disable_ust_channel(struct ust_app *app, | |
1252 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1253 | { | |
1254 | int ret; | |
1255 | ||
840cb59c | 1256 | health_code_update(); |
86acf0da | 1257 | |
852d0037 | 1258 | ret = ustctl_disable(app->sock, ua_chan->obj); |
78f0bacd | 1259 | if (ret < 0) { |
ffe60014 DG |
1260 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1261 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1262 | "and session handle %d with ret %d", | |
1263 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1264 | } else { | |
3757b385 DG |
1265 | /* |
1266 | * This is normal behavior, an application can die during the | |
1267 | * creation process. Don't report an error so the execution can | |
1268 | * continue normally. | |
1269 | */ | |
1270 | ret = 0; | |
ffe60014 DG |
1271 | DBG3("UST app disable channel failed. Application is dead."); |
1272 | } | |
78f0bacd DG |
1273 | goto error; |
1274 | } | |
1275 | ||
78f0bacd | 1276 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1277 | ua_chan->name, app->pid); |
78f0bacd DG |
1278 | |
1279 | error: | |
840cb59c | 1280 | health_code_update(); |
78f0bacd DG |
1281 | return ret; |
1282 | } | |
1283 | ||
1284 | /* | |
1285 | * Enable the specified channel on to UST tracer for the UST session. | |
1286 | */ | |
1287 | static int enable_ust_channel(struct ust_app *app, | |
1288 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1289 | { | |
1290 | int ret; | |
1291 | ||
840cb59c | 1292 | health_code_update(); |
86acf0da | 1293 | |
852d0037 | 1294 | ret = ustctl_enable(app->sock, ua_chan->obj); |
78f0bacd | 1295 | if (ret < 0) { |
ffe60014 DG |
1296 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1297 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1298 | "and session handle %d with ret %d", | |
1299 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1300 | } else { | |
3757b385 DG |
1301 | /* |
1302 | * This is normal behavior, an application can die during the | |
1303 | * creation process. Don't report an error so the execution can | |
1304 | * continue normally. | |
1305 | */ | |
1306 | ret = 0; | |
ffe60014 DG |
1307 | DBG3("UST app enable channel failed. Application is dead."); |
1308 | } | |
78f0bacd DG |
1309 | goto error; |
1310 | } | |
1311 | ||
1312 | ua_chan->enabled = 1; | |
1313 | ||
1314 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1315 | ua_chan->name, app->pid); |
78f0bacd DG |
1316 | |
1317 | error: | |
840cb59c | 1318 | health_code_update(); |
78f0bacd DG |
1319 | return ret; |
1320 | } | |
1321 | ||
edb67388 DG |
1322 | /* |
1323 | * Enable the specified event on to UST tracer for the UST session. | |
1324 | */ | |
1325 | static int enable_ust_event(struct ust_app *app, | |
1326 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1327 | { | |
1328 | int ret; | |
1329 | ||
840cb59c | 1330 | health_code_update(); |
86acf0da | 1331 | |
852d0037 | 1332 | ret = ustctl_enable(app->sock, ua_event->obj); |
edb67388 | 1333 | if (ret < 0) { |
ffe60014 DG |
1334 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1335 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1336 | "and session handle %d with ret %d", | |
1337 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1338 | } else { | |
3757b385 DG |
1339 | /* |
1340 | * This is normal behavior, an application can die during the | |
1341 | * creation process. Don't report an error so the execution can | |
1342 | * continue normally. | |
1343 | */ | |
1344 | ret = 0; | |
ffe60014 DG |
1345 | DBG3("UST app enable event failed. Application is dead."); |
1346 | } | |
edb67388 DG |
1347 | goto error; |
1348 | } | |
1349 | ||
1350 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1351 | ua_event->attr.name, app->pid); |
edb67388 DG |
1352 | |
1353 | error: | |
840cb59c | 1354 | health_code_update(); |
edb67388 DG |
1355 | return ret; |
1356 | } | |
1357 | ||
099e26bd | 1358 | /* |
7972aab2 | 1359 | * Send channel and stream buffer to application. |
4f3ab6ee | 1360 | * |
ffe60014 | 1361 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1362 | */ |
7972aab2 DG |
1363 | static int send_channel_pid_to_ust(struct ust_app *app, |
1364 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1365 | { |
1366 | int ret; | |
ffe60014 | 1367 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1368 | |
1369 | assert(app); | |
ffe60014 | 1370 | assert(ua_sess); |
4f3ab6ee | 1371 | assert(ua_chan); |
4f3ab6ee | 1372 | |
840cb59c | 1373 | health_code_update(); |
4f3ab6ee | 1374 | |
7972aab2 DG |
1375 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1376 | app->sock); | |
86acf0da | 1377 | |
ffe60014 DG |
1378 | /* Send channel to the application. */ |
1379 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
5b4a0ec0 | 1380 | if (ret < 0) { |
b551a063 DG |
1381 | goto error; |
1382 | } | |
1383 | ||
d88aee68 DG |
1384 | health_code_update(); |
1385 | ||
ffe60014 DG |
1386 | /* Send all streams to application. */ |
1387 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1388 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
1389 | if (ret < 0) { | |
1390 | goto error; | |
1391 | } | |
1392 | /* We don't need the stream anymore once sent to the tracer. */ | |
1393 | cds_list_del(&stream->list); | |
1394 | delete_ust_app_stream(-1, stream); | |
1395 | } | |
ffe60014 DG |
1396 | /* Flag the channel that it is sent to the application. */ |
1397 | ua_chan->is_sent = 1; | |
ffe60014 | 1398 | |
b551a063 | 1399 | error: |
840cb59c | 1400 | health_code_update(); |
b551a063 DG |
1401 | return ret; |
1402 | } | |
1403 | ||
91d76f53 | 1404 | /* |
5b4a0ec0 | 1405 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1406 | * |
1407 | * Should be called with session mutex held. | |
91d76f53 | 1408 | */ |
edb67388 DG |
1409 | static |
1410 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1411 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1412 | { |
5b4a0ec0 | 1413 | int ret = 0; |
284d8f55 | 1414 | |
840cb59c | 1415 | health_code_update(); |
86acf0da | 1416 | |
5b4a0ec0 | 1417 | /* Create UST event on tracer */ |
852d0037 | 1418 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 DG |
1419 | &ua_event->obj); |
1420 | if (ret < 0) { | |
ffe60014 DG |
1421 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1422 | ERR("Error ustctl create event %s for app pid: %d with ret %d", | |
1423 | ua_event->attr.name, app->pid, ret); | |
1424 | } else { | |
3757b385 DG |
1425 | /* |
1426 | * This is normal behavior, an application can die during the | |
1427 | * creation process. Don't report an error so the execution can | |
1428 | * continue normally. | |
1429 | */ | |
1430 | ret = 0; | |
ffe60014 DG |
1431 | DBG3("UST app create event failed. Application is dead."); |
1432 | } | |
5b4a0ec0 | 1433 | goto error; |
91d76f53 | 1434 | } |
f6a9efaa | 1435 | |
5b4a0ec0 | 1436 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1437 | |
5b4a0ec0 | 1438 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1439 | ua_event->attr.name, app->pid); |
f6a9efaa | 1440 | |
840cb59c | 1441 | health_code_update(); |
86acf0da | 1442 | |
025faf73 DG |
1443 | /* Set filter if one is present. */ |
1444 | if (ua_event->filter) { | |
1445 | ret = set_ust_event_filter(ua_event, app); | |
1446 | if (ret < 0) { | |
1447 | goto error; | |
1448 | } | |
1449 | } | |
1450 | ||
7cc9a73c JI |
1451 | /* Set exclusions for the event */ |
1452 | if (ua_event->exclusion) { | |
1453 | ret = set_ust_event_exclusion(ua_event, app); | |
1454 | if (ret < 0) { | |
1455 | goto error; | |
1456 | } | |
1457 | } | |
1458 | ||
8535a6d9 | 1459 | /* If event not enabled, disable it on the tracer */ |
40113787 MD |
1460 | if (ua_event->enabled) { |
1461 | /* | |
1462 | * We now need to explicitly enable the event, since it | |
1463 | * is now disabled at creation. | |
1464 | */ | |
1465 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1466 | if (ret < 0) { | |
1467 | /* | |
1468 | * If we hit an EPERM, something is wrong with our enable call. If | |
1469 | * we get an EEXIST, there is a problem on the tracer side since we | |
1470 | * just created it. | |
1471 | */ | |
1472 | switch (ret) { | |
1473 | case -LTTNG_UST_ERR_PERM: | |
1474 | /* Code flow problem */ | |
1475 | assert(0); | |
1476 | case -LTTNG_UST_ERR_EXIST: | |
1477 | /* It's OK for our use case. */ | |
1478 | ret = 0; | |
1479 | break; | |
1480 | default: | |
1481 | break; | |
1482 | } | |
1483 | goto error; | |
1484 | } | |
8535a6d9 DG |
1485 | } |
1486 | ||
5b4a0ec0 | 1487 | error: |
840cb59c | 1488 | health_code_update(); |
5b4a0ec0 | 1489 | return ret; |
91d76f53 | 1490 | } |
48842b30 | 1491 | |
5b4a0ec0 DG |
1492 | /* |
1493 | * Copy data between an UST app event and a LTT event. | |
1494 | */ | |
421cb601 | 1495 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1496 | struct ltt_ust_event *uevent) |
1497 | { | |
b4ffad32 JI |
1498 | size_t exclusion_alloc_size; |
1499 | ||
48842b30 DG |
1500 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); |
1501 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1502 | ||
fc34caaa DG |
1503 | ua_event->enabled = uevent->enabled; |
1504 | ||
5b4a0ec0 DG |
1505 | /* Copy event attributes */ |
1506 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1507 | ||
53a80697 MD |
1508 | /* Copy filter bytecode */ |
1509 | if (uevent->filter) { | |
025faf73 DG |
1510 | ua_event->filter = alloc_copy_ust_app_filter(uevent->filter); |
1511 | /* Filter might be NULL here in case of ENONEM. */ | |
53a80697 | 1512 | } |
b4ffad32 JI |
1513 | |
1514 | /* Copy exclusion data */ | |
1515 | if (uevent->exclusion) { | |
1516 | exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) + | |
1517 | LTTNG_UST_SYM_NAME_LEN * uevent->exclusion->count; | |
1518 | ua_event->exclusion = zmalloc(exclusion_alloc_size); | |
5f8df26c JI |
1519 | if (ua_event->exclusion == NULL) { |
1520 | PERROR("malloc"); | |
1521 | } else { | |
1522 | memcpy(ua_event->exclusion, uevent->exclusion, | |
1523 | exclusion_alloc_size); | |
b4ffad32 JI |
1524 | } |
1525 | } | |
48842b30 DG |
1526 | } |
1527 | ||
5b4a0ec0 DG |
1528 | /* |
1529 | * Copy data between an UST app channel and a LTT channel. | |
1530 | */ | |
421cb601 | 1531 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1532 | struct ltt_ust_channel *uchan) |
1533 | { | |
bec39940 | 1534 | struct lttng_ht_iter iter; |
48842b30 | 1535 | struct ltt_ust_event *uevent; |
55cc08a6 | 1536 | struct ltt_ust_context *uctx; |
48842b30 | 1537 | struct ust_app_event *ua_event; |
55cc08a6 | 1538 | struct ust_app_ctx *ua_ctx; |
48842b30 | 1539 | |
fc34caaa | 1540 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1541 | |
1542 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1543 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 1544 | |
1624d5b7 JD |
1545 | ua_chan->tracefile_size = uchan->tracefile_size; |
1546 | ua_chan->tracefile_count = uchan->tracefile_count; | |
1547 | ||
ffe60014 DG |
1548 | /* Copy event attributes since the layout is different. */ |
1549 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1550 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1551 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1552 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1553 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
1554 | ua_chan->attr.output = uchan->attr.output; | |
1555 | /* | |
1556 | * Note that the attribute channel type is not set since the channel on the | |
1557 | * tracing registry side does not have this information. | |
1558 | */ | |
48842b30 | 1559 | |
fc34caaa | 1560 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1561 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1562 | |
31746f93 | 1563 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { |
55cc08a6 DG |
1564 | ua_ctx = alloc_ust_app_ctx(&uctx->ctx); |
1565 | if (ua_ctx == NULL) { | |
1566 | continue; | |
1567 | } | |
bec39940 DG |
1568 | lttng_ht_node_init_ulong(&ua_ctx->node, |
1569 | (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 1570 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 1571 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
55cc08a6 | 1572 | } |
48842b30 | 1573 | |
421cb601 | 1574 | /* Copy all events from ltt ust channel to ust app channel */ |
bec39940 | 1575 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
18eace3b | 1576 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 1577 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 1578 | if (ua_event == NULL) { |
421cb601 | 1579 | DBG2("UST event %s not found on shadow copy channel", |
48842b30 | 1580 | uevent->attr.name); |
284d8f55 | 1581 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
48842b30 | 1582 | if (ua_event == NULL) { |
5b4a0ec0 | 1583 | continue; |
48842b30 | 1584 | } |
421cb601 | 1585 | shadow_copy_event(ua_event, uevent); |
d0b96690 | 1586 | add_unique_ust_app_event(ua_chan, ua_event); |
48842b30 | 1587 | } |
48842b30 DG |
1588 | } |
1589 | ||
fc34caaa | 1590 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1591 | } |
1592 | ||
5b4a0ec0 DG |
1593 | /* |
1594 | * Copy data between a UST app session and a regular LTT session. | |
1595 | */ | |
421cb601 | 1596 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1597 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1598 | { |
bec39940 DG |
1599 | struct lttng_ht_node_str *ua_chan_node; |
1600 | struct lttng_ht_iter iter; | |
48842b30 DG |
1601 | struct ltt_ust_channel *uchan; |
1602 | struct ust_app_channel *ua_chan; | |
477d7741 MD |
1603 | time_t rawtime; |
1604 | struct tm *timeinfo; | |
1605 | char datetime[16]; | |
1606 | int ret; | |
1607 | ||
1608 | /* Get date and time for unique app path */ | |
1609 | time(&rawtime); | |
1610 | timeinfo = localtime(&rawtime); | |
1611 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1612 | |
421cb601 | 1613 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1614 | |
7972aab2 DG |
1615 | ua_sess->tracing_id = usess->id; |
1616 | ua_sess->id = get_next_session_id(); | |
1617 | ua_sess->uid = app->uid; | |
1618 | ua_sess->gid = app->gid; | |
1619 | ua_sess->euid = usess->uid; | |
1620 | ua_sess->egid = usess->gid; | |
1621 | ua_sess->buffer_type = usess->buffer_type; | |
1622 | ua_sess->bits_per_long = app->bits_per_long; | |
1623 | /* There is only one consumer object per session possible. */ | |
1624 | ua_sess->consumer = usess->consumer; | |
2bba9e53 | 1625 | ua_sess->output_traces = usess->output_traces; |
ecc48a90 | 1626 | ua_sess->live_timer_interval = usess->live_timer_interval; |
84ad93e8 DG |
1627 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, |
1628 | &usess->metadata_attr); | |
7972aab2 DG |
1629 | |
1630 | switch (ua_sess->buffer_type) { | |
1631 | case LTTNG_BUFFER_PER_PID: | |
1632 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 1633 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
1634 | datetime); |
1635 | break; | |
1636 | case LTTNG_BUFFER_PER_UID: | |
1637 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1638 | DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long); | |
1639 | break; | |
1640 | default: | |
1641 | assert(0); | |
1642 | goto error; | |
1643 | } | |
477d7741 MD |
1644 | if (ret < 0) { |
1645 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1646 | assert(0); |
7972aab2 | 1647 | goto error; |
477d7741 MD |
1648 | } |
1649 | ||
48842b30 | 1650 | /* Iterate over all channels in global domain. */ |
bec39940 DG |
1651 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, |
1652 | uchan, node.node) { | |
1653 | struct lttng_ht_iter uiter; | |
ba767faf | 1654 | |
bec39940 DG |
1655 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
1656 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
5b4a0ec0 | 1657 | if (ua_chan_node != NULL) { |
fc34caaa | 1658 | /* Session exist. Contiuing. */ |
5b4a0ec0 DG |
1659 | continue; |
1660 | } | |
421cb601 | 1661 | |
5b4a0ec0 DG |
1662 | DBG2("Channel %s not found on shadow session copy, creating it", |
1663 | uchan->name); | |
d0b96690 | 1664 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
5b4a0ec0 | 1665 | if (ua_chan == NULL) { |
fc34caaa | 1666 | /* malloc failed FIXME: Might want to do handle ENOMEM .. */ |
5b4a0ec0 | 1667 | continue; |
48842b30 | 1668 | } |
5b4a0ec0 | 1669 | shadow_copy_channel(ua_chan, uchan); |
ffe60014 DG |
1670 | /* |
1671 | * The concept of metadata channel does not exist on the tracing | |
1672 | * registry side of the session daemon so this can only be a per CPU | |
1673 | * channel and not metadata. | |
1674 | */ | |
1675 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
1676 | ||
bec39940 | 1677 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); |
48842b30 | 1678 | } |
7972aab2 DG |
1679 | |
1680 | error: | |
1681 | return; | |
48842b30 DG |
1682 | } |
1683 | ||
78f0bacd DG |
1684 | /* |
1685 | * Lookup sesison wrapper. | |
1686 | */ | |
84cd17c6 MD |
1687 | static |
1688 | void __lookup_session_by_app(struct ltt_ust_session *usess, | |
bec39940 | 1689 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1690 | { |
1691 | /* Get right UST app session from app */ | |
d9bf3ca4 | 1692 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
1693 | } |
1694 | ||
421cb601 DG |
1695 | /* |
1696 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1697 | * id. |
421cb601 | 1698 | */ |
48842b30 DG |
1699 | static struct ust_app_session *lookup_session_by_app( |
1700 | struct ltt_ust_session *usess, struct ust_app *app) | |
1701 | { | |
bec39940 | 1702 | struct lttng_ht_iter iter; |
d9bf3ca4 | 1703 | struct lttng_ht_node_u64 *node; |
48842b30 | 1704 | |
84cd17c6 | 1705 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 1706 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
1707 | if (node == NULL) { |
1708 | goto error; | |
1709 | } | |
1710 | ||
1711 | return caa_container_of(node, struct ust_app_session, node); | |
1712 | ||
1713 | error: | |
1714 | return NULL; | |
1715 | } | |
1716 | ||
7972aab2 DG |
1717 | /* |
1718 | * Setup buffer registry per PID for the given session and application. If none | |
1719 | * is found, a new one is created, added to the global registry and | |
1720 | * initialized. If regp is valid, it's set with the newly created object. | |
1721 | * | |
1722 | * Return 0 on success or else a negative value. | |
1723 | */ | |
1724 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
1725 | struct ust_app *app, struct buffer_reg_pid **regp) | |
1726 | { | |
1727 | int ret = 0; | |
1728 | struct buffer_reg_pid *reg_pid; | |
1729 | ||
1730 | assert(ua_sess); | |
1731 | assert(app); | |
1732 | ||
1733 | rcu_read_lock(); | |
1734 | ||
1735 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
1736 | if (!reg_pid) { | |
1737 | /* | |
1738 | * This is the create channel path meaning that if there is NO | |
1739 | * registry available, we have to create one for this session. | |
1740 | */ | |
1741 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid); | |
1742 | if (ret < 0) { | |
1743 | goto error; | |
1744 | } | |
7972aab2 DG |
1745 | } else { |
1746 | goto end; | |
1747 | } | |
1748 | ||
1749 | /* Initialize registry. */ | |
1750 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
1751 | app->bits_per_long, app->uint8_t_alignment, | |
1752 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1753 | app->uint64_t_alignment, app->long_alignment, |
1754 | app->byte_order, app->version.major, | |
1755 | app->version.minor); | |
7972aab2 | 1756 | if (ret < 0) { |
286c991a MD |
1757 | /* |
1758 | * reg_pid->registry->reg.ust is NULL upon error, so we need to | |
1759 | * destroy the buffer registry, because it is always expected | |
1760 | * that if the buffer registry can be found, its ust registry is | |
1761 | * non-NULL. | |
1762 | */ | |
1763 | buffer_reg_pid_destroy(reg_pid); | |
7972aab2 DG |
1764 | goto error; |
1765 | } | |
1766 | ||
286c991a MD |
1767 | buffer_reg_pid_add(reg_pid); |
1768 | ||
7972aab2 DG |
1769 | DBG3("UST app buffer registry per PID created successfully"); |
1770 | ||
1771 | end: | |
1772 | if (regp) { | |
1773 | *regp = reg_pid; | |
1774 | } | |
1775 | error: | |
1776 | rcu_read_unlock(); | |
1777 | return ret; | |
1778 | } | |
1779 | ||
1780 | /* | |
1781 | * Setup buffer registry per UID for the given session and application. If none | |
1782 | * is found, a new one is created, added to the global registry and | |
1783 | * initialized. If regp is valid, it's set with the newly created object. | |
1784 | * | |
1785 | * Return 0 on success or else a negative value. | |
1786 | */ | |
1787 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
1788 | struct ust_app *app, struct buffer_reg_uid **regp) | |
1789 | { | |
1790 | int ret = 0; | |
1791 | struct buffer_reg_uid *reg_uid; | |
1792 | ||
1793 | assert(usess); | |
1794 | assert(app); | |
1795 | ||
1796 | rcu_read_lock(); | |
1797 | ||
1798 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
1799 | if (!reg_uid) { | |
1800 | /* | |
1801 | * This is the create channel path meaning that if there is NO | |
1802 | * registry available, we have to create one for this session. | |
1803 | */ | |
1804 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
1805 | LTTNG_DOMAIN_UST, ®_uid); | |
1806 | if (ret < 0) { | |
1807 | goto error; | |
1808 | } | |
7972aab2 DG |
1809 | } else { |
1810 | goto end; | |
1811 | } | |
1812 | ||
1813 | /* Initialize registry. */ | |
af6142cf | 1814 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
1815 | app->bits_per_long, app->uint8_t_alignment, |
1816 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1817 | app->uint64_t_alignment, app->long_alignment, |
1818 | app->byte_order, app->version.major, | |
1819 | app->version.minor); | |
7972aab2 | 1820 | if (ret < 0) { |
286c991a MD |
1821 | /* |
1822 | * reg_uid->registry->reg.ust is NULL upon error, so we need to | |
1823 | * destroy the buffer registry, because it is always expected | |
1824 | * that if the buffer registry can be found, its ust registry is | |
1825 | * non-NULL. | |
1826 | */ | |
1827 | buffer_reg_uid_destroy(reg_uid, NULL); | |
7972aab2 DG |
1828 | goto error; |
1829 | } | |
1830 | /* Add node to teardown list of the session. */ | |
1831 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
1832 | ||
286c991a | 1833 | buffer_reg_uid_add(reg_uid); |
7972aab2 | 1834 | |
286c991a | 1835 | DBG3("UST app buffer registry per UID created successfully"); |
7972aab2 DG |
1836 | end: |
1837 | if (regp) { | |
1838 | *regp = reg_uid; | |
1839 | } | |
1840 | error: | |
1841 | rcu_read_unlock(); | |
1842 | return ret; | |
1843 | } | |
1844 | ||
421cb601 | 1845 | /* |
3d8ca23b | 1846 | * Create a session on the tracer side for the given app. |
421cb601 | 1847 | * |
3d8ca23b DG |
1848 | * On success, ua_sess_ptr is populated with the session pointer or else left |
1849 | * untouched. If the session was created, is_created is set to 1. On error, | |
1850 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
1851 | * be NULL. | |
1852 | * | |
1853 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
1854 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 1855 | */ |
3d8ca23b DG |
1856 | static int create_ust_app_session(struct ltt_ust_session *usess, |
1857 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, | |
1858 | int *is_created) | |
421cb601 | 1859 | { |
3d8ca23b | 1860 | int ret, created = 0; |
421cb601 DG |
1861 | struct ust_app_session *ua_sess; |
1862 | ||
3d8ca23b DG |
1863 | assert(usess); |
1864 | assert(app); | |
1865 | assert(ua_sess_ptr); | |
1866 | ||
840cb59c | 1867 | health_code_update(); |
86acf0da | 1868 | |
421cb601 DG |
1869 | ua_sess = lookup_session_by_app(usess, app); |
1870 | if (ua_sess == NULL) { | |
d9bf3ca4 | 1871 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 1872 | app->pid, usess->id); |
d0b96690 | 1873 | ua_sess = alloc_ust_app_session(app); |
421cb601 DG |
1874 | if (ua_sess == NULL) { |
1875 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
1876 | ret = -ENOMEM; |
1877 | goto error; | |
421cb601 | 1878 | } |
477d7741 | 1879 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 1880 | created = 1; |
421cb601 DG |
1881 | } |
1882 | ||
7972aab2 DG |
1883 | switch (usess->buffer_type) { |
1884 | case LTTNG_BUFFER_PER_PID: | |
1885 | /* Init local registry. */ | |
1886 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 1887 | if (ret < 0) { |
e64207cf | 1888 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
1889 | goto error; |
1890 | } | |
1891 | break; | |
1892 | case LTTNG_BUFFER_PER_UID: | |
1893 | /* Look for a global registry. If none exists, create one. */ | |
1894 | ret = setup_buffer_reg_uid(usess, app, NULL); | |
1895 | if (ret < 0) { | |
e64207cf | 1896 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
1897 | goto error; |
1898 | } | |
1899 | break; | |
1900 | default: | |
1901 | assert(0); | |
1902 | ret = -EINVAL; | |
1903 | goto error; | |
1904 | } | |
1905 | ||
1906 | health_code_update(); | |
1907 | ||
1908 | if (ua_sess->handle == -1) { | |
1909 | ret = ustctl_create_session(app->sock); | |
1910 | if (ret < 0) { | |
1911 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1912 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
1913 | app->pid, ret); |
1914 | } else { | |
1915 | DBG("UST app creating session failed. Application is dead"); | |
3757b385 DG |
1916 | /* |
1917 | * This is normal behavior, an application can die during the | |
1918 | * creation process. Don't report an error so the execution can | |
1919 | * continue normally. This will get flagged ENOTCONN and the | |
1920 | * caller will handle it. | |
1921 | */ | |
1922 | ret = 0; | |
ffe60014 | 1923 | } |
d0b96690 | 1924 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
1925 | if (ret != -ENOMEM) { |
1926 | /* | |
1927 | * Tracer is probably gone or got an internal error so let's | |
1928 | * behave like it will soon unregister or not usable. | |
1929 | */ | |
1930 | ret = -ENOTCONN; | |
1931 | } | |
1932 | goto error; | |
421cb601 DG |
1933 | } |
1934 | ||
7972aab2 DG |
1935 | ua_sess->handle = ret; |
1936 | ||
1937 | /* Add ust app session to app's HT */ | |
d9bf3ca4 MD |
1938 | lttng_ht_node_init_u64(&ua_sess->node, |
1939 | ua_sess->tracing_id); | |
1940 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
7972aab2 DG |
1941 | |
1942 | DBG2("UST app session created successfully with handle %d", ret); | |
1943 | } | |
1944 | ||
1945 | *ua_sess_ptr = ua_sess; | |
1946 | if (is_created) { | |
1947 | *is_created = created; | |
1948 | } | |
1949 | ||
1950 | /* Everything went well. */ | |
1951 | ret = 0; | |
1952 | ||
1953 | error: | |
1954 | health_code_update(); | |
1955 | return ret; | |
1956 | } | |
1957 | ||
6a6b2068 JG |
1958 | /* |
1959 | * Match function for a hash table lookup of ust_app_ctx. | |
1960 | * | |
1961 | * It matches an ust app context based on the context type and, in the case | |
1962 | * of perf counters, their name. | |
1963 | */ | |
1964 | static int ht_match_ust_app_ctx(struct cds_lfht_node *node, const void *_key) | |
1965 | { | |
1966 | struct ust_app_ctx *ctx; | |
1967 | const struct lttng_ust_context *key; | |
1968 | ||
1969 | assert(node); | |
1970 | assert(_key); | |
1971 | ||
1972 | ctx = caa_container_of(node, struct ust_app_ctx, node.node); | |
1973 | key = _key; | |
1974 | ||
1975 | /* Context type */ | |
1976 | if (ctx->ctx.ctx != key->ctx) { | |
1977 | goto no_match; | |
1978 | } | |
1979 | ||
1980 | /* Check the name in the case of perf thread counters. */ | |
1981 | if (key->ctx == LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER) { | |
1982 | if (strncmp(key->u.perf_counter.name, | |
1983 | ctx->ctx.u.perf_counter.name, | |
1984 | sizeof(key->u.perf_counter.name))) { | |
1985 | goto no_match; | |
1986 | } | |
1987 | } | |
1988 | ||
1989 | /* Match. */ | |
1990 | return 1; | |
1991 | ||
1992 | no_match: | |
1993 | return 0; | |
1994 | } | |
1995 | ||
1996 | /* | |
1997 | * Lookup for an ust app context from an lttng_ust_context. | |
1998 | * | |
be184a0f | 1999 | * Must be called while holding RCU read side lock. |
6a6b2068 JG |
2000 | * Return an ust_app_ctx object or NULL on error. |
2001 | */ | |
2002 | static | |
2003 | struct ust_app_ctx *find_ust_app_context(struct lttng_ht *ht, | |
2004 | struct lttng_ust_context *uctx) | |
2005 | { | |
2006 | struct lttng_ht_iter iter; | |
2007 | struct lttng_ht_node_ulong *node; | |
2008 | struct ust_app_ctx *app_ctx = NULL; | |
2009 | ||
2010 | assert(uctx); | |
2011 | assert(ht); | |
2012 | ||
2013 | /* Lookup using the lttng_ust_context_type and a custom match fct. */ | |
2014 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) uctx->ctx, lttng_ht_seed), | |
2015 | ht_match_ust_app_ctx, uctx, &iter.iter); | |
2016 | node = lttng_ht_iter_get_node_ulong(&iter); | |
2017 | if (!node) { | |
2018 | goto end; | |
2019 | } | |
2020 | ||
2021 | app_ctx = caa_container_of(node, struct ust_app_ctx, node); | |
2022 | ||
2023 | end: | |
2024 | return app_ctx; | |
2025 | } | |
2026 | ||
7972aab2 DG |
2027 | /* |
2028 | * Create a context for the channel on the tracer. | |
2029 | * | |
2030 | * Called with UST app session lock held and a RCU read side lock. | |
2031 | */ | |
2032 | static | |
2033 | int create_ust_app_channel_context(struct ust_app_session *ua_sess, | |
2034 | struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx, | |
2035 | struct ust_app *app) | |
2036 | { | |
2037 | int ret = 0; | |
7972aab2 DG |
2038 | struct ust_app_ctx *ua_ctx; |
2039 | ||
2040 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
2041 | ||
6a6b2068 JG |
2042 | ua_ctx = find_ust_app_context(ua_chan->ctx, uctx); |
2043 | if (ua_ctx) { | |
7972aab2 DG |
2044 | ret = -EEXIST; |
2045 | goto error; | |
2046 | } | |
2047 | ||
2048 | ua_ctx = alloc_ust_app_ctx(uctx); | |
2049 | if (ua_ctx == NULL) { | |
2050 | /* malloc failed */ | |
2051 | ret = -1; | |
2052 | goto error; | |
2053 | } | |
2054 | ||
2055 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 2056 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 2057 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
2058 | |
2059 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
2060 | if (ret < 0) { | |
2061 | goto error; | |
2062 | } | |
2063 | ||
2064 | error: | |
2065 | return ret; | |
2066 | } | |
2067 | ||
2068 | /* | |
2069 | * Enable on the tracer side a ust app event for the session and channel. | |
2070 | * | |
2071 | * Called with UST app session lock held. | |
2072 | */ | |
2073 | static | |
2074 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
2075 | struct ust_app_event *ua_event, struct ust_app *app) | |
2076 | { | |
2077 | int ret; | |
2078 | ||
2079 | ret = enable_ust_event(app, ua_sess, ua_event); | |
2080 | if (ret < 0) { | |
2081 | goto error; | |
2082 | } | |
2083 | ||
2084 | ua_event->enabled = 1; | |
2085 | ||
2086 | error: | |
2087 | return ret; | |
2088 | } | |
2089 | ||
2090 | /* | |
2091 | * Disable on the tracer side a ust app event for the session and channel. | |
2092 | */ | |
2093 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
2094 | struct ust_app_event *ua_event, struct ust_app *app) | |
2095 | { | |
2096 | int ret; | |
2097 | ||
2098 | ret = disable_ust_event(app, ua_sess, ua_event); | |
2099 | if (ret < 0) { | |
2100 | goto error; | |
2101 | } | |
2102 | ||
2103 | ua_event->enabled = 0; | |
2104 | ||
2105 | error: | |
2106 | return ret; | |
2107 | } | |
2108 | ||
2109 | /* | |
2110 | * Lookup ust app channel for session and disable it on the tracer side. | |
2111 | */ | |
2112 | static | |
2113 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
2114 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
2115 | { | |
2116 | int ret; | |
2117 | ||
2118 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2119 | if (ret < 0) { | |
2120 | goto error; | |
2121 | } | |
2122 | ||
2123 | ua_chan->enabled = 0; | |
2124 | ||
2125 | error: | |
2126 | return ret; | |
2127 | } | |
2128 | ||
2129 | /* | |
2130 | * Lookup ust app channel for session and enable it on the tracer side. This | |
2131 | * MUST be called with a RCU read side lock acquired. | |
2132 | */ | |
2133 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
2134 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
2135 | { | |
2136 | int ret = 0; | |
2137 | struct lttng_ht_iter iter; | |
2138 | struct lttng_ht_node_str *ua_chan_node; | |
2139 | struct ust_app_channel *ua_chan; | |
2140 | ||
2141 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
2142 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
2143 | if (ua_chan_node == NULL) { | |
d9bf3ca4 | 2144 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
2145 | uchan->name, ua_sess->tracing_id); |
2146 | goto error; | |
2147 | } | |
2148 | ||
2149 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2150 | ||
2151 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
2152 | if (ret < 0) { | |
2153 | goto error; | |
2154 | } | |
2155 | ||
2156 | error: | |
2157 | return ret; | |
2158 | } | |
2159 | ||
2160 | /* | |
2161 | * Ask the consumer to create a channel and get it if successful. | |
2162 | * | |
2163 | * Return 0 on success or else a negative value. | |
2164 | */ | |
2165 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
2166 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
2167 | int bitness, struct ust_registry_session *registry) | |
2168 | { | |
2169 | int ret; | |
2170 | unsigned int nb_fd = 0; | |
2171 | struct consumer_socket *socket; | |
2172 | ||
2173 | assert(usess); | |
2174 | assert(ua_sess); | |
2175 | assert(ua_chan); | |
2176 | assert(registry); | |
2177 | ||
2178 | rcu_read_lock(); | |
2179 | health_code_update(); | |
2180 | ||
2181 | /* Get the right consumer socket for the application. */ | |
2182 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
2183 | if (!socket) { | |
2184 | ret = -EINVAL; | |
2185 | goto error; | |
2186 | } | |
2187 | ||
2188 | health_code_update(); | |
2189 | ||
2190 | /* Need one fd for the channel. */ | |
2191 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2192 | if (ret < 0) { | |
2193 | ERR("Exhausted number of available FD upon create channel"); | |
2194 | goto error; | |
2195 | } | |
2196 | ||
2197 | /* | |
2198 | * Ask consumer to create channel. The consumer will return the number of | |
2199 | * stream we have to expect. | |
2200 | */ | |
2201 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
2202 | registry); | |
2203 | if (ret < 0) { | |
2204 | goto error_ask; | |
2205 | } | |
2206 | ||
2207 | /* | |
2208 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2209 | * stream (2 being the default value here). | |
2210 | */ | |
2211 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2212 | ||
2213 | /* Reserve the amount of file descriptor we need. */ | |
2214 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2215 | if (ret < 0) { | |
2216 | ERR("Exhausted number of available FD upon create channel"); | |
2217 | goto error_fd_get_stream; | |
2218 | } | |
2219 | ||
2220 | health_code_update(); | |
2221 | ||
2222 | /* | |
2223 | * Now get the channel from the consumer. This call wil populate the stream | |
2224 | * list of that channel and set the ust objects. | |
2225 | */ | |
d9078d0c DG |
2226 | if (usess->consumer->enabled) { |
2227 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2228 | if (ret < 0) { | |
2229 | goto error_destroy; | |
2230 | } | |
7972aab2 DG |
2231 | } |
2232 | ||
2233 | rcu_read_unlock(); | |
2234 | return 0; | |
2235 | ||
2236 | error_destroy: | |
2237 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2238 | error_fd_get_stream: | |
2239 | /* | |
2240 | * Initiate a destroy channel on the consumer since we had an error | |
2241 | * handling it on our side. The return value is of no importance since we | |
2242 | * already have a ret value set by the previous error that we need to | |
2243 | * return. | |
2244 | */ | |
2245 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2246 | error_ask: | |
2247 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2248 | error: | |
2249 | health_code_update(); | |
2250 | rcu_read_unlock(); | |
2251 | return ret; | |
2252 | } | |
2253 | ||
2254 | /* | |
2255 | * Duplicate the ust data object of the ust app stream and save it in the | |
2256 | * buffer registry stream. | |
2257 | * | |
2258 | * Return 0 on success or else a negative value. | |
2259 | */ | |
2260 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2261 | struct ust_app_stream *stream) | |
2262 | { | |
2263 | int ret; | |
2264 | ||
2265 | assert(reg_stream); | |
2266 | assert(stream); | |
2267 | ||
2268 | /* Reserve the amount of file descriptor we need. */ | |
2269 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2270 | if (ret < 0) { | |
2271 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2272 | goto error; | |
2273 | } | |
2274 | ||
2275 | /* Duplicate object for stream once the original is in the registry. */ | |
2276 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2277 | reg_stream->obj.ust); | |
2278 | if (ret < 0) { | |
2279 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2280 | reg_stream->obj.ust, stream->obj, ret); | |
2281 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2282 | goto error; | |
2283 | } | |
2284 | stream->handle = stream->obj->handle; | |
2285 | ||
2286 | error: | |
2287 | return ret; | |
2288 | } | |
2289 | ||
2290 | /* | |
2291 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2292 | * buffer registry channel. | |
2293 | * | |
2294 | * Return 0 on success or else a negative value. | |
2295 | */ | |
2296 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2297 | struct ust_app_channel *ua_chan) | |
2298 | { | |
2299 | int ret; | |
2300 | ||
2301 | assert(reg_chan); | |
2302 | assert(ua_chan); | |
2303 | ||
2304 | /* Need two fds for the channel. */ | |
2305 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2306 | if (ret < 0) { | |
2307 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2308 | goto error_fd_get; | |
2309 | } | |
2310 | ||
2311 | /* Duplicate object for stream once the original is in the registry. */ | |
2312 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2313 | if (ret < 0) { | |
2314 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2315 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2316 | goto error; | |
2317 | } | |
2318 | ua_chan->handle = ua_chan->obj->handle; | |
2319 | ||
2320 | return 0; | |
2321 | ||
2322 | error: | |
2323 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2324 | error_fd_get: | |
2325 | return ret; | |
2326 | } | |
2327 | ||
2328 | /* | |
2329 | * For a given channel buffer registry, setup all streams of the given ust | |
2330 | * application channel. | |
2331 | * | |
2332 | * Return 0 on success or else a negative value. | |
2333 | */ | |
2334 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
2335 | struct ust_app_channel *ua_chan) | |
2336 | { | |
2337 | int ret = 0; | |
2338 | struct ust_app_stream *stream, *stmp; | |
2339 | ||
2340 | assert(reg_chan); | |
2341 | assert(ua_chan); | |
2342 | ||
2343 | DBG2("UST app setup buffer registry stream"); | |
2344 | ||
2345 | /* Send all streams to application. */ | |
2346 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2347 | struct buffer_reg_stream *reg_stream; | |
2348 | ||
2349 | ret = buffer_reg_stream_create(®_stream); | |
2350 | if (ret < 0) { | |
2351 | goto error; | |
2352 | } | |
2353 | ||
2354 | /* | |
2355 | * Keep original pointer and nullify it in the stream so the delete | |
2356 | * stream call does not release the object. | |
2357 | */ | |
2358 | reg_stream->obj.ust = stream->obj; | |
2359 | stream->obj = NULL; | |
2360 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2361 | |
7972aab2 DG |
2362 | /* We don't need the streams anymore. */ |
2363 | cds_list_del(&stream->list); | |
2364 | delete_ust_app_stream(-1, stream); | |
2365 | } | |
421cb601 | 2366 | |
7972aab2 DG |
2367 | error: |
2368 | return ret; | |
2369 | } | |
2370 | ||
2371 | /* | |
2372 | * Create a buffer registry channel for the given session registry and | |
2373 | * application channel object. If regp pointer is valid, it's set with the | |
2374 | * created object. Important, the created object is NOT added to the session | |
2375 | * registry hash table. | |
2376 | * | |
2377 | * Return 0 on success else a negative value. | |
2378 | */ | |
2379 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2380 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2381 | { | |
2382 | int ret; | |
2383 | struct buffer_reg_channel *reg_chan = NULL; | |
2384 | ||
2385 | assert(reg_sess); | |
2386 | assert(ua_chan); | |
2387 | ||
2388 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2389 | ||
2390 | /* Create buffer registry channel. */ | |
2391 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2392 | if (ret < 0) { | |
2393 | goto error_create; | |
421cb601 | 2394 | } |
7972aab2 DG |
2395 | assert(reg_chan); |
2396 | reg_chan->consumer_key = ua_chan->key; | |
8c924c7b | 2397 | reg_chan->subbuf_size = ua_chan->attr.subbuf_size; |
421cb601 | 2398 | |
7972aab2 DG |
2399 | /* Create and add a channel registry to session. */ |
2400 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2401 | ua_chan->tracing_channel_id); | |
2402 | if (ret < 0) { | |
2403 | goto error; | |
d88aee68 | 2404 | } |
7972aab2 | 2405 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2406 | |
7972aab2 DG |
2407 | if (regp) { |
2408 | *regp = reg_chan; | |
3d8ca23b | 2409 | } |
d88aee68 | 2410 | |
7972aab2 | 2411 | return 0; |
3d8ca23b DG |
2412 | |
2413 | error: | |
7972aab2 DG |
2414 | /* Safe because the registry channel object was not added to any HT. */ |
2415 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2416 | error_create: | |
3d8ca23b | 2417 | return ret; |
421cb601 DG |
2418 | } |
2419 | ||
55cc08a6 | 2420 | /* |
7972aab2 DG |
2421 | * Setup buffer registry channel for the given session registry and application |
2422 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2423 | * |
7972aab2 | 2424 | * Return 0 on success else a negative value. |
55cc08a6 | 2425 | */ |
7972aab2 DG |
2426 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
2427 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan) | |
55cc08a6 | 2428 | { |
7972aab2 | 2429 | int ret; |
55cc08a6 | 2430 | |
7972aab2 DG |
2431 | assert(reg_sess); |
2432 | assert(reg_chan); | |
2433 | assert(ua_chan); | |
2434 | assert(ua_chan->obj); | |
55cc08a6 | 2435 | |
7972aab2 | 2436 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2437 | |
7972aab2 DG |
2438 | /* Setup all streams for the registry. */ |
2439 | ret = setup_buffer_reg_streams(reg_chan, ua_chan); | |
2440 | if (ret < 0) { | |
55cc08a6 DG |
2441 | goto error; |
2442 | } | |
2443 | ||
7972aab2 DG |
2444 | reg_chan->obj.ust = ua_chan->obj; |
2445 | ua_chan->obj = NULL; | |
55cc08a6 | 2446 | |
7972aab2 | 2447 | return 0; |
55cc08a6 DG |
2448 | |
2449 | error: | |
7972aab2 DG |
2450 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2451 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2452 | return ret; |
2453 | } | |
2454 | ||
edb67388 | 2455 | /* |
7972aab2 | 2456 | * Send buffer registry channel to the application. |
d0b96690 | 2457 | * |
7972aab2 | 2458 | * Return 0 on success else a negative value. |
edb67388 | 2459 | */ |
7972aab2 DG |
2460 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2461 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2462 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2463 | { |
2464 | int ret; | |
7972aab2 | 2465 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2466 | |
7972aab2 DG |
2467 | assert(reg_chan); |
2468 | assert(app); | |
2469 | assert(ua_sess); | |
2470 | assert(ua_chan); | |
2471 | ||
2472 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2473 | ||
2474 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2475 | if (ret < 0) { |
2476 | goto error; | |
2477 | } | |
2478 | ||
7972aab2 DG |
2479 | /* Send channel to the application. */ |
2480 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
2481 | if (ret < 0) { | |
2482 | goto error; | |
2483 | } | |
2484 | ||
2485 | health_code_update(); | |
2486 | ||
2487 | /* Send all streams to application. */ | |
2488 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2489 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2490 | struct ust_app_stream stream; | |
2491 | ||
2492 | ret = duplicate_stream_object(reg_stream, &stream); | |
2493 | if (ret < 0) { | |
2494 | goto error_stream_unlock; | |
2495 | } | |
2496 | ||
2497 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2498 | if (ret < 0) { | |
8c067051 | 2499 | (void) release_ust_app_stream(-1, &stream); |
7972aab2 DG |
2500 | goto error_stream_unlock; |
2501 | } | |
edb67388 | 2502 | |
7972aab2 DG |
2503 | /* |
2504 | * The return value is not important here. This function will output an | |
2505 | * error if needed. | |
2506 | */ | |
2507 | (void) release_ust_app_stream(-1, &stream); | |
2508 | } | |
2509 | ua_chan->is_sent = 1; | |
2510 | ||
2511 | error_stream_unlock: | |
2512 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2513 | error: |
2514 | return ret; | |
2515 | } | |
2516 | ||
9730260e | 2517 | /* |
7972aab2 DG |
2518 | * Create and send to the application the created buffers with per UID buffers. |
2519 | * | |
2520 | * Return 0 on success else a negative value. | |
9730260e | 2521 | */ |
7972aab2 DG |
2522 | static int create_channel_per_uid(struct ust_app *app, |
2523 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2524 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2525 | { |
2526 | int ret; | |
7972aab2 DG |
2527 | struct buffer_reg_uid *reg_uid; |
2528 | struct buffer_reg_channel *reg_chan; | |
9730260e | 2529 | |
7972aab2 DG |
2530 | assert(app); |
2531 | assert(usess); | |
2532 | assert(ua_sess); | |
2533 | assert(ua_chan); | |
2534 | ||
2535 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2536 | ||
2537 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2538 | /* | |
2539 | * The session creation handles the creation of this global registry | |
2540 | * object. If none can be find, there is a code flow problem or a | |
2541 | * teardown race. | |
2542 | */ | |
2543 | assert(reg_uid); | |
2544 | ||
2545 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2546 | reg_uid); | |
2547 | if (!reg_chan) { | |
2548 | /* Create the buffer registry channel object. */ | |
2549 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2550 | if (ret < 0) { | |
f14256d6 MD |
2551 | ERR("Error creating the UST channel \"%s\" registry instance", |
2552 | ua_chan->name); | |
7972aab2 DG |
2553 | goto error; |
2554 | } | |
2555 | assert(reg_chan); | |
2556 | ||
2557 | /* | |
2558 | * Create the buffers on the consumer side. This call populates the | |
2559 | * ust app channel object with all streams and data object. | |
2560 | */ | |
2561 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2562 | app->bits_per_long, reg_uid->registry->reg.ust); | |
2563 | if (ret < 0) { | |
f14256d6 MD |
2564 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
2565 | ua_chan->name); | |
2566 | ||
07d2ae95 DG |
2567 | /* |
2568 | * Let's remove the previously created buffer registry channel so | |
2569 | * it's not visible anymore in the session registry. | |
2570 | */ | |
2571 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, | |
2572 | ua_chan->tracing_channel_id); | |
2573 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
2574 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
7972aab2 DG |
2575 | goto error; |
2576 | } | |
2577 | ||
2578 | /* | |
2579 | * Setup the streams and add it to the session registry. | |
2580 | */ | |
2581 | ret = setup_buffer_reg_channel(reg_uid->registry, ua_chan, reg_chan); | |
2582 | if (ret < 0) { | |
f14256d6 MD |
2583 | ERR("Error setting up UST channel \"%s\"", |
2584 | ua_chan->name); | |
7972aab2 DG |
2585 | goto error; |
2586 | } | |
2587 | ||
2588 | } | |
2589 | ||
2590 | /* Send buffers to the application. */ | |
2591 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
9730260e | 2592 | if (ret < 0) { |
f14256d6 MD |
2593 | /* |
2594 | * Don't report error to the console, since it may be | |
2595 | * caused by application concurrently exiting. | |
2596 | */ | |
9730260e DG |
2597 | goto error; |
2598 | } | |
2599 | ||
9730260e DG |
2600 | error: |
2601 | return ret; | |
2602 | } | |
2603 | ||
78f0bacd | 2604 | /* |
7972aab2 DG |
2605 | * Create and send to the application the created buffers with per PID buffers. |
2606 | * | |
2607 | * Return 0 on success else a negative value. | |
78f0bacd | 2608 | */ |
7972aab2 DG |
2609 | static int create_channel_per_pid(struct ust_app *app, |
2610 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2611 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2612 | { |
8535a6d9 | 2613 | int ret; |
7972aab2 | 2614 | struct ust_registry_session *registry; |
78f0bacd | 2615 | |
7972aab2 DG |
2616 | assert(app); |
2617 | assert(usess); | |
2618 | assert(ua_sess); | |
2619 | assert(ua_chan); | |
2620 | ||
2621 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2622 | ||
2623 | rcu_read_lock(); | |
2624 | ||
2625 | registry = get_session_registry(ua_sess); | |
2626 | assert(registry); | |
2627 | ||
2628 | /* Create and add a new channel registry to session. */ | |
2629 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd | 2630 | if (ret < 0) { |
f14256d6 MD |
2631 | ERR("Error creating the UST channel \"%s\" registry instance", |
2632 | ua_chan->name); | |
78f0bacd DG |
2633 | goto error; |
2634 | } | |
2635 | ||
7972aab2 DG |
2636 | /* Create and get channel on the consumer side. */ |
2637 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2638 | app->bits_per_long, registry); | |
2639 | if (ret < 0) { | |
f14256d6 MD |
2640 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
2641 | ua_chan->name); | |
7972aab2 DG |
2642 | goto error; |
2643 | } | |
2644 | ||
2645 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
2646 | if (ret < 0) { | |
f14256d6 MD |
2647 | /* |
2648 | * Don't report error to the console, since it may be | |
2649 | * caused by application concurrently exiting. | |
2650 | */ | |
7972aab2 DG |
2651 | goto error; |
2652 | } | |
8535a6d9 | 2653 | |
78f0bacd | 2654 | error: |
7972aab2 | 2655 | rcu_read_unlock(); |
78f0bacd DG |
2656 | return ret; |
2657 | } | |
2658 | ||
2659 | /* | |
7972aab2 DG |
2660 | * From an already allocated ust app channel, create the channel buffers if |
2661 | * need and send it to the application. This MUST be called with a RCU read | |
2662 | * side lock acquired. | |
2663 | * | |
2664 | * Return 0 on success or else a negative value. | |
78f0bacd | 2665 | */ |
7972aab2 DG |
2666 | static int do_create_channel(struct ust_app *app, |
2667 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2668 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2669 | { |
7972aab2 | 2670 | int ret; |
78f0bacd | 2671 | |
7972aab2 DG |
2672 | assert(app); |
2673 | assert(usess); | |
2674 | assert(ua_sess); | |
2675 | assert(ua_chan); | |
2676 | ||
2677 | /* Handle buffer type before sending the channel to the application. */ | |
2678 | switch (usess->buffer_type) { | |
2679 | case LTTNG_BUFFER_PER_UID: | |
2680 | { | |
2681 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
2682 | if (ret < 0) { | |
2683 | goto error; | |
2684 | } | |
2685 | break; | |
2686 | } | |
2687 | case LTTNG_BUFFER_PER_PID: | |
2688 | { | |
2689 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
2690 | if (ret < 0) { | |
2691 | goto error; | |
2692 | } | |
2693 | break; | |
2694 | } | |
2695 | default: | |
2696 | assert(0); | |
2697 | ret = -EINVAL; | |
78f0bacd DG |
2698 | goto error; |
2699 | } | |
2700 | ||
7972aab2 DG |
2701 | /* Initialize ust objd object using the received handle and add it. */ |
2702 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
2703 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 2704 | |
7972aab2 DG |
2705 | /* If channel is not enabled, disable it on the tracer */ |
2706 | if (!ua_chan->enabled) { | |
2707 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2708 | if (ret < 0) { | |
2709 | goto error; | |
2710 | } | |
78f0bacd DG |
2711 | } |
2712 | ||
2713 | error: | |
2714 | return ret; | |
2715 | } | |
2716 | ||
284d8f55 | 2717 | /* |
4d710ac2 DG |
2718 | * Create UST app channel and create it on the tracer. Set ua_chanp of the |
2719 | * newly created channel if not NULL. | |
d0b96690 | 2720 | * |
36b588ed | 2721 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 DG |
2722 | * |
2723 | * Return 0 on success or else a negative value. | |
284d8f55 | 2724 | */ |
4d710ac2 DG |
2725 | static int create_ust_app_channel(struct ust_app_session *ua_sess, |
2726 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
7972aab2 | 2727 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 2728 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
2729 | { |
2730 | int ret = 0; | |
bec39940 DG |
2731 | struct lttng_ht_iter iter; |
2732 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
2733 | struct ust_app_channel *ua_chan; |
2734 | ||
2735 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
2736 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
2737 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 2738 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 2739 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 2740 | goto end; |
5b4a0ec0 DG |
2741 | } |
2742 | ||
d0b96690 | 2743 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
2744 | if (ua_chan == NULL) { |
2745 | /* Only malloc can fail here */ | |
4d710ac2 | 2746 | ret = -ENOMEM; |
094d1690 | 2747 | goto error_alloc; |
fc34caaa DG |
2748 | } |
2749 | shadow_copy_channel(ua_chan, uchan); | |
2750 | ||
ffe60014 DG |
2751 | /* Set channel type. */ |
2752 | ua_chan->attr.type = type; | |
2753 | ||
7972aab2 | 2754 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
5b4a0ec0 DG |
2755 | if (ret < 0) { |
2756 | goto error; | |
2757 | } | |
2758 | ||
fc34caaa | 2759 | DBG2("UST app create channel %s for PID %d completed", ua_chan->name, |
852d0037 | 2760 | app->pid); |
fc34caaa | 2761 | |
d0b96690 DG |
2762 | /* Only add the channel if successful on the tracer side. */ |
2763 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
2764 | ||
fc34caaa | 2765 | end: |
4d710ac2 DG |
2766 | if (ua_chanp) { |
2767 | *ua_chanp = ua_chan; | |
2768 | } | |
2769 | ||
2770 | /* Everything went well. */ | |
2771 | return 0; | |
5b4a0ec0 DG |
2772 | |
2773 | error: | |
d0b96690 | 2774 | delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app); |
094d1690 | 2775 | error_alloc: |
4d710ac2 | 2776 | return ret; |
5b4a0ec0 DG |
2777 | } |
2778 | ||
2779 | /* | |
2780 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
2781 | * |
2782 | * Called with ust app session mutex held. | |
5b4a0ec0 | 2783 | */ |
edb67388 DG |
2784 | static |
2785 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
2786 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
2787 | struct ust_app *app) | |
284d8f55 | 2788 | { |
edb67388 | 2789 | int ret = 0; |
5b4a0ec0 | 2790 | struct ust_app_event *ua_event; |
284d8f55 | 2791 | |
5b4a0ec0 | 2792 | /* Get event node */ |
18eace3b | 2793 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 2794 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 2795 | if (ua_event != NULL) { |
fc34caaa | 2796 | ret = -EEXIST; |
edb67388 DG |
2797 | goto end; |
2798 | } | |
5b4a0ec0 | 2799 | |
edb67388 DG |
2800 | /* Does not exist so create one */ |
2801 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); | |
2802 | if (ua_event == NULL) { | |
2803 | /* Only malloc can failed so something is really wrong */ | |
2804 | ret = -ENOMEM; | |
fc34caaa | 2805 | goto end; |
5b4a0ec0 | 2806 | } |
edb67388 | 2807 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 2808 | |
edb67388 | 2809 | /* Create it on the tracer side */ |
5b4a0ec0 | 2810 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 2811 | if (ret < 0) { |
fc34caaa | 2812 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 2813 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
2814 | goto error; |
2815 | } | |
2816 | ||
d0b96690 | 2817 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 2818 | |
fc34caaa | 2819 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 2820 | app->pid); |
7f79d3a1 | 2821 | |
edb67388 | 2822 | end: |
fc34caaa DG |
2823 | return ret; |
2824 | ||
5b4a0ec0 | 2825 | error: |
fc34caaa DG |
2826 | /* Valid. Calling here is already in a read side lock */ |
2827 | delete_ust_app_event(-1, ua_event); | |
edb67388 | 2828 | return ret; |
5b4a0ec0 DG |
2829 | } |
2830 | ||
2831 | /* | |
2832 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 2833 | * |
7972aab2 | 2834 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
2835 | */ |
2836 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
ad7a9107 | 2837 | struct ust_app *app, struct consumer_output *consumer) |
5b4a0ec0 DG |
2838 | { |
2839 | int ret = 0; | |
ffe60014 | 2840 | struct ust_app_channel *metadata; |
d88aee68 | 2841 | struct consumer_socket *socket; |
7972aab2 | 2842 | struct ust_registry_session *registry; |
5b4a0ec0 | 2843 | |
ffe60014 DG |
2844 | assert(ua_sess); |
2845 | assert(app); | |
d88aee68 | 2846 | assert(consumer); |
5b4a0ec0 | 2847 | |
7972aab2 DG |
2848 | registry = get_session_registry(ua_sess); |
2849 | assert(registry); | |
2850 | ||
ce34fcd0 MD |
2851 | pthread_mutex_lock(®istry->lock); |
2852 | ||
1b532a60 DG |
2853 | /* Metadata already exists for this registry or it was closed previously */ |
2854 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
2855 | ret = 0; |
2856 | goto error; | |
5b4a0ec0 DG |
2857 | } |
2858 | ||
ffe60014 | 2859 | /* Allocate UST metadata */ |
d0b96690 | 2860 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
2861 | if (!metadata) { |
2862 | /* malloc() failed */ | |
2863 | ret = -ENOMEM; | |
2864 | goto error; | |
2865 | } | |
5b4a0ec0 | 2866 | |
ad7a9107 | 2867 | memcpy(&metadata->attr, &ua_sess->metadata_attr, sizeof(metadata->attr)); |
5b4a0ec0 | 2868 | |
7972aab2 DG |
2869 | /* Need one fd for the channel. */ |
2870 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2871 | if (ret < 0) { | |
2872 | ERR("Exhausted number of available FD upon create metadata"); | |
2873 | goto error; | |
2874 | } | |
2875 | ||
4dc3dfc5 DG |
2876 | /* Get the right consumer socket for the application. */ |
2877 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
2878 | if (!socket) { | |
2879 | ret = -EINVAL; | |
2880 | goto error_consumer; | |
2881 | } | |
2882 | ||
331744e3 JD |
2883 | /* |
2884 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
2885 | * to the registry *before* we ask the consumer so we avoid the race of the | |
2886 | * consumer requesting the metadata and the ask_channel call on our side | |
2887 | * did not returned yet. | |
2888 | */ | |
2889 | registry->metadata_key = metadata->key; | |
2890 | ||
d88aee68 DG |
2891 | /* |
2892 | * Ask the metadata channel creation to the consumer. The metadata object | |
2893 | * will be created by the consumer and kept their. However, the stream is | |
2894 | * never added or monitored until we do a first push metadata to the | |
2895 | * consumer. | |
2896 | */ | |
7972aab2 DG |
2897 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
2898 | registry); | |
d88aee68 | 2899 | if (ret < 0) { |
f2a444f1 DG |
2900 | /* Nullify the metadata key so we don't try to close it later on. */ |
2901 | registry->metadata_key = 0; | |
d88aee68 DG |
2902 | goto error_consumer; |
2903 | } | |
2904 | ||
2905 | /* | |
2906 | * The setup command will make the metadata stream be sent to the relayd, | |
2907 | * if applicable, and the thread managing the metadatas. This is important | |
2908 | * because after this point, if an error occurs, the only way the stream | |
2909 | * can be deleted is to be monitored in the consumer. | |
2910 | */ | |
7972aab2 | 2911 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 2912 | if (ret < 0) { |
f2a444f1 DG |
2913 | /* Nullify the metadata key so we don't try to close it later on. */ |
2914 | registry->metadata_key = 0; | |
d88aee68 | 2915 | goto error_consumer; |
5b4a0ec0 DG |
2916 | } |
2917 | ||
7972aab2 DG |
2918 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
2919 | metadata->key, app->pid); | |
5b4a0ec0 | 2920 | |
d88aee68 | 2921 | error_consumer: |
b80f0b6c | 2922 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 2923 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 2924 | error: |
ce34fcd0 | 2925 | pthread_mutex_unlock(®istry->lock); |
ffe60014 | 2926 | return ret; |
5b4a0ec0 DG |
2927 | } |
2928 | ||
5b4a0ec0 | 2929 | /* |
d88aee68 DG |
2930 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
2931 | * acquired before calling this function. | |
5b4a0ec0 DG |
2932 | */ |
2933 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
2934 | { | |
d88aee68 | 2935 | struct ust_app *app = NULL; |
bec39940 DG |
2936 | struct lttng_ht_node_ulong *node; |
2937 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 2938 | |
bec39940 DG |
2939 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
2940 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
2941 | if (node == NULL) { |
2942 | DBG2("UST app no found with pid %d", pid); | |
2943 | goto error; | |
2944 | } | |
5b4a0ec0 DG |
2945 | |
2946 | DBG2("Found UST app by pid %d", pid); | |
2947 | ||
d88aee68 | 2948 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
2949 | |
2950 | error: | |
d88aee68 | 2951 | return app; |
5b4a0ec0 DG |
2952 | } |
2953 | ||
d88aee68 DG |
2954 | /* |
2955 | * Allocate and init an UST app object using the registration information and | |
2956 | * the command socket. This is called when the command socket connects to the | |
2957 | * session daemon. | |
2958 | * | |
2959 | * The object is returned on success or else NULL. | |
2960 | */ | |
d0b96690 | 2961 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 2962 | { |
d0b96690 DG |
2963 | struct ust_app *lta = NULL; |
2964 | ||
2965 | assert(msg); | |
2966 | assert(sock >= 0); | |
2967 | ||
2968 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 2969 | |
173af62f DG |
2970 | if ((msg->bits_per_long == 64 && |
2971 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
2972 | || (msg->bits_per_long == 32 && | |
2973 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 2974 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
2975 | "%d-bit long, but no consumerd for this size is available.\n", |
2976 | msg->name, msg->pid, msg->bits_per_long); | |
2977 | goto error; | |
3f2c5fcc | 2978 | } |
d0b96690 | 2979 | |
5b4a0ec0 DG |
2980 | lta = zmalloc(sizeof(struct ust_app)); |
2981 | if (lta == NULL) { | |
2982 | PERROR("malloc"); | |
d0b96690 | 2983 | goto error; |
5b4a0ec0 DG |
2984 | } |
2985 | ||
2986 | lta->ppid = msg->ppid; | |
2987 | lta->uid = msg->uid; | |
2988 | lta->gid = msg->gid; | |
d0b96690 | 2989 | |
7753dea8 | 2990 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
2991 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
2992 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
2993 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
2994 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
2995 | lta->long_alignment = msg->long_alignment; | |
2996 | lta->byte_order = msg->byte_order; | |
2997 | ||
5b4a0ec0 DG |
2998 | lta->v_major = msg->major; |
2999 | lta->v_minor = msg->minor; | |
d9bf3ca4 | 3000 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 DG |
3001 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
3002 | lta->notify_sock = -1; | |
d88aee68 DG |
3003 | |
3004 | /* Copy name and make sure it's NULL terminated. */ | |
3005 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
3006 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
3007 | ||
3008 | /* | |
3009 | * Before this can be called, when receiving the registration information, | |
3010 | * the application compatibility is checked. So, at this point, the | |
3011 | * application can work with this session daemon. | |
3012 | */ | |
d0b96690 | 3013 | lta->compatible = 1; |
5b4a0ec0 | 3014 | |
852d0037 | 3015 | lta->pid = msg->pid; |
d0b96690 | 3016 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 3017 | lta->sock = sock; |
d0b96690 | 3018 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 3019 | |
d42f20df DG |
3020 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
3021 | ||
d0b96690 DG |
3022 | error: |
3023 | return lta; | |
3024 | } | |
3025 | ||
d88aee68 DG |
3026 | /* |
3027 | * For a given application object, add it to every hash table. | |
3028 | */ | |
d0b96690 DG |
3029 | void ust_app_add(struct ust_app *app) |
3030 | { | |
3031 | assert(app); | |
3032 | assert(app->notify_sock >= 0); | |
3033 | ||
5b4a0ec0 | 3034 | rcu_read_lock(); |
852d0037 DG |
3035 | |
3036 | /* | |
3037 | * On a re-registration, we want to kick out the previous registration of | |
3038 | * that pid | |
3039 | */ | |
d0b96690 | 3040 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
3041 | |
3042 | /* | |
3043 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
3044 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
3045 | * already in the table. | |
3046 | */ | |
d0b96690 | 3047 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 3048 | |
d0b96690 DG |
3049 | /* Add application to the notify socket hash table. */ |
3050 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
3051 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 3052 | |
d0b96690 | 3053 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
3054 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
3055 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
3056 | app->v_minor); | |
5b4a0ec0 | 3057 | |
d0b96690 DG |
3058 | rcu_read_unlock(); |
3059 | } | |
3060 | ||
d88aee68 DG |
3061 | /* |
3062 | * Set the application version into the object. | |
3063 | * | |
3064 | * Return 0 on success else a negative value either an errno code or a | |
3065 | * LTTng-UST error code. | |
3066 | */ | |
d0b96690 DG |
3067 | int ust_app_version(struct ust_app *app) |
3068 | { | |
d88aee68 DG |
3069 | int ret; |
3070 | ||
d0b96690 | 3071 | assert(app); |
d88aee68 DG |
3072 | |
3073 | ret = ustctl_tracer_version(app->sock, &app->version); | |
3074 | if (ret < 0) { | |
3075 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
5368d366 | 3076 | ERR("UST app %d version failed with ret %d", app->sock, ret); |
d88aee68 | 3077 | } else { |
5368d366 | 3078 | DBG3("UST app %d version failed. Application is dead", app->sock); |
d88aee68 DG |
3079 | } |
3080 | } | |
3081 | ||
3082 | return ret; | |
5b4a0ec0 DG |
3083 | } |
3084 | ||
3085 | /* | |
3086 | * Unregister app by removing it from the global traceable app list and freeing | |
3087 | * the data struct. | |
3088 | * | |
3089 | * The socket is already closed at this point so no close to sock. | |
3090 | */ | |
3091 | void ust_app_unregister(int sock) | |
3092 | { | |
3093 | struct ust_app *lta; | |
bec39940 | 3094 | struct lttng_ht_node_ulong *node; |
c4b88406 | 3095 | struct lttng_ht_iter ust_app_sock_iter; |
bec39940 | 3096 | struct lttng_ht_iter iter; |
d42f20df | 3097 | struct ust_app_session *ua_sess; |
525b0740 | 3098 | int ret; |
5b4a0ec0 DG |
3099 | |
3100 | rcu_read_lock(); | |
886459c6 | 3101 | |
5b4a0ec0 | 3102 | /* Get the node reference for a call_rcu */ |
c4b88406 MD |
3103 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &ust_app_sock_iter); |
3104 | node = lttng_ht_iter_get_node_ulong(&ust_app_sock_iter); | |
d0b96690 | 3105 | assert(node); |
284d8f55 | 3106 | |
852d0037 | 3107 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
3108 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
3109 | ||
d88aee68 | 3110 | /* |
ce34fcd0 MD |
3111 | * For per-PID buffers, perform "push metadata" and flush all |
3112 | * application streams before removing app from hash tables, | |
3113 | * ensuring proper behavior of data_pending check. | |
c4b88406 | 3114 | * Remove sessions so they are not visible during deletion. |
d88aee68 | 3115 | */ |
d42f20df DG |
3116 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, |
3117 | node.node) { | |
7972aab2 DG |
3118 | struct ust_registry_session *registry; |
3119 | ||
d42f20df DG |
3120 | ret = lttng_ht_del(lta->sessions, &iter); |
3121 | if (ret) { | |
3122 | /* The session was already removed so scheduled for teardown. */ | |
3123 | continue; | |
3124 | } | |
3125 | ||
ce34fcd0 MD |
3126 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { |
3127 | (void) ust_app_flush_app_session(lta, ua_sess); | |
3128 | } | |
c4b88406 | 3129 | |
d42f20df DG |
3130 | /* |
3131 | * Add session to list for teardown. This is safe since at this point we | |
3132 | * are the only one using this list. | |
3133 | */ | |
d88aee68 DG |
3134 | pthread_mutex_lock(&ua_sess->lock); |
3135 | ||
3136 | /* | |
3137 | * Normally, this is done in the delete session process which is | |
3138 | * executed in the call rcu below. However, upon registration we can't | |
3139 | * afford to wait for the grace period before pushing data or else the | |
3140 | * data pending feature can race between the unregistration and stop | |
3141 | * command where the data pending command is sent *before* the grace | |
3142 | * period ended. | |
3143 | * | |
3144 | * The close metadata below nullifies the metadata pointer in the | |
3145 | * session so the delete session will NOT push/close a second time. | |
3146 | */ | |
7972aab2 | 3147 | registry = get_session_registry(ua_sess); |
ce34fcd0 | 3148 | if (registry) { |
7972aab2 DG |
3149 | /* Push metadata for application before freeing the application. */ |
3150 | (void) push_metadata(registry, ua_sess->consumer); | |
3151 | ||
3152 | /* | |
3153 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
3154 | * metadata only on destroy trace session in this case. Also, the |
3155 | * previous push metadata could have flag the metadata registry to | |
3156 | * close so don't send a close command if closed. | |
7972aab2 | 3157 | */ |
ce34fcd0 | 3158 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
3159 | /* And ask to close it for this session registry. */ |
3160 | (void) close_metadata(registry, ua_sess->consumer); | |
3161 | } | |
3162 | } | |
d42f20df | 3163 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
c4b88406 | 3164 | |
d88aee68 | 3165 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
3166 | } |
3167 | ||
c4b88406 MD |
3168 | /* Remove application from PID hash table */ |
3169 | ret = lttng_ht_del(ust_app_ht_by_sock, &ust_app_sock_iter); | |
3170 | assert(!ret); | |
3171 | ||
3172 | /* | |
3173 | * Remove application from notify hash table. The thread handling the | |
3174 | * notify socket could have deleted the node so ignore on error because | |
3175 | * either way it's valid. The close of that socket is handled by the other | |
3176 | * thread. | |
3177 | */ | |
3178 | iter.iter.node = <a->notify_sock_n.node; | |
3179 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3180 | ||
3181 | /* | |
3182 | * Ignore return value since the node might have been removed before by an | |
3183 | * add replace during app registration because the PID can be reassigned by | |
3184 | * the OS. | |
3185 | */ | |
3186 | iter.iter.node = <a->pid_n.node; | |
3187 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3188 | if (ret) { | |
3189 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
3190 | lta->pid); | |
3191 | } | |
3192 | ||
852d0037 DG |
3193 | /* Free memory */ |
3194 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
3195 | ||
5b4a0ec0 DG |
3196 | rcu_read_unlock(); |
3197 | return; | |
284d8f55 DG |
3198 | } |
3199 | ||
5b4a0ec0 DG |
3200 | /* |
3201 | * Fill events array with all events name of all registered apps. | |
3202 | */ | |
3203 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 3204 | { |
5b4a0ec0 DG |
3205 | int ret, handle; |
3206 | size_t nbmem, count = 0; | |
bec39940 | 3207 | struct lttng_ht_iter iter; |
5b4a0ec0 | 3208 | struct ust_app *app; |
c617c0c6 | 3209 | struct lttng_event *tmp_event; |
421cb601 | 3210 | |
5b4a0ec0 | 3211 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
3212 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
3213 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
3214 | PERROR("zmalloc ust app events"); |
3215 | ret = -ENOMEM; | |
421cb601 DG |
3216 | goto error; |
3217 | } | |
3218 | ||
5b4a0ec0 | 3219 | rcu_read_lock(); |
421cb601 | 3220 | |
852d0037 | 3221 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 3222 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 3223 | |
840cb59c | 3224 | health_code_update(); |
86acf0da | 3225 | |
e0c7ec2b DG |
3226 | if (!app->compatible) { |
3227 | /* | |
3228 | * TODO: In time, we should notice the caller of this error by | |
3229 | * telling him that this is a version error. | |
3230 | */ | |
3231 | continue; | |
3232 | } | |
852d0037 | 3233 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 3234 | if (handle < 0) { |
ffe60014 DG |
3235 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3236 | ERR("UST app list events getting handle failed for app pid %d", | |
3237 | app->pid); | |
3238 | } | |
5b4a0ec0 DG |
3239 | continue; |
3240 | } | |
421cb601 | 3241 | |
852d0037 | 3242 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 3243 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3244 | /* Handle ustctl error. */ |
3245 | if (ret < 0) { | |
a2ba1ab0 | 3246 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3247 | ERR("UST app tp list get failed for app %d with ret %d", |
3248 | app->sock, ret); | |
3249 | } else { | |
3250 | DBG3("UST app tp list get failed. Application is dead"); | |
3757b385 DG |
3251 | /* |
3252 | * This is normal behavior, an application can die during the | |
3253 | * creation process. Don't report an error so the execution can | |
3254 | * continue normally. Continue normal execution. | |
3255 | */ | |
3256 | break; | |
ffe60014 | 3257 | } |
98f595d4 | 3258 | free(tmp_event); |
ffe60014 DG |
3259 | goto rcu_error; |
3260 | } | |
3261 | ||
840cb59c | 3262 | health_code_update(); |
815564d8 | 3263 | if (count >= nbmem) { |
d7b3776f | 3264 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3265 | struct lttng_event *new_tmp_event; |
3266 | size_t new_nbmem; | |
3267 | ||
3268 | new_nbmem = nbmem << 1; | |
3269 | DBG2("Reallocating event list from %zu to %zu entries", | |
3270 | nbmem, new_nbmem); | |
3271 | new_tmp_event = realloc(tmp_event, | |
3272 | new_nbmem * sizeof(struct lttng_event)); | |
3273 | if (new_tmp_event == NULL) { | |
5b4a0ec0 | 3274 | PERROR("realloc ust app events"); |
c617c0c6 | 3275 | free(tmp_event); |
5b4a0ec0 DG |
3276 | ret = -ENOMEM; |
3277 | goto rcu_error; | |
3278 | } | |
53efb85a MD |
3279 | /* Zero the new memory */ |
3280 | memset(new_tmp_event + nbmem, 0, | |
3281 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
3282 | nbmem = new_nbmem; | |
3283 | tmp_event = new_tmp_event; | |
5b4a0ec0 | 3284 | } |
c617c0c6 MD |
3285 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
3286 | tmp_event[count].loglevel = uiter.loglevel; | |
3287 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
3288 | tmp_event[count].pid = app->pid; | |
3289 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 3290 | count++; |
421cb601 | 3291 | } |
421cb601 DG |
3292 | } |
3293 | ||
5b4a0ec0 | 3294 | ret = count; |
c617c0c6 | 3295 | *events = tmp_event; |
421cb601 | 3296 | |
5b4a0ec0 | 3297 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 3298 | |
5b4a0ec0 DG |
3299 | rcu_error: |
3300 | rcu_read_unlock(); | |
421cb601 | 3301 | error: |
840cb59c | 3302 | health_code_update(); |
5b4a0ec0 | 3303 | return ret; |
421cb601 DG |
3304 | } |
3305 | ||
f37d259d MD |
3306 | /* |
3307 | * Fill events array with all events name of all registered apps. | |
3308 | */ | |
3309 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
3310 | { | |
3311 | int ret, handle; | |
3312 | size_t nbmem, count = 0; | |
3313 | struct lttng_ht_iter iter; | |
3314 | struct ust_app *app; | |
c617c0c6 | 3315 | struct lttng_event_field *tmp_event; |
f37d259d MD |
3316 | |
3317 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
3318 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
3319 | if (tmp_event == NULL) { | |
f37d259d MD |
3320 | PERROR("zmalloc ust app event fields"); |
3321 | ret = -ENOMEM; | |
3322 | goto error; | |
3323 | } | |
3324 | ||
3325 | rcu_read_lock(); | |
3326 | ||
3327 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3328 | struct lttng_ust_field_iter uiter; | |
3329 | ||
840cb59c | 3330 | health_code_update(); |
86acf0da | 3331 | |
f37d259d MD |
3332 | if (!app->compatible) { |
3333 | /* | |
3334 | * TODO: In time, we should notice the caller of this error by | |
3335 | * telling him that this is a version error. | |
3336 | */ | |
3337 | continue; | |
3338 | } | |
3339 | handle = ustctl_tracepoint_field_list(app->sock); | |
3340 | if (handle < 0) { | |
ffe60014 DG |
3341 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3342 | ERR("UST app list field getting handle failed for app pid %d", | |
3343 | app->pid); | |
3344 | } | |
f37d259d MD |
3345 | continue; |
3346 | } | |
3347 | ||
3348 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 3349 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3350 | /* Handle ustctl error. */ |
3351 | if (ret < 0) { | |
a2ba1ab0 | 3352 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3353 | ERR("UST app tp list field failed for app %d with ret %d", |
3354 | app->sock, ret); | |
3355 | } else { | |
3356 | DBG3("UST app tp list field failed. Application is dead"); | |
3757b385 DG |
3357 | /* |
3358 | * This is normal behavior, an application can die during the | |
3359 | * creation process. Don't report an error so the execution can | |
98f595d4 | 3360 | * continue normally. Reset list and count for next app. |
3757b385 DG |
3361 | */ |
3362 | break; | |
ffe60014 | 3363 | } |
98f595d4 | 3364 | free(tmp_event); |
ffe60014 DG |
3365 | goto rcu_error; |
3366 | } | |
3367 | ||
840cb59c | 3368 | health_code_update(); |
f37d259d | 3369 | if (count >= nbmem) { |
d7b3776f | 3370 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3371 | struct lttng_event_field *new_tmp_event; |
3372 | size_t new_nbmem; | |
3373 | ||
3374 | new_nbmem = nbmem << 1; | |
3375 | DBG2("Reallocating event field list from %zu to %zu entries", | |
3376 | nbmem, new_nbmem); | |
3377 | new_tmp_event = realloc(tmp_event, | |
3378 | new_nbmem * sizeof(struct lttng_event_field)); | |
3379 | if (new_tmp_event == NULL) { | |
f37d259d | 3380 | PERROR("realloc ust app event fields"); |
c617c0c6 | 3381 | free(tmp_event); |
f37d259d MD |
3382 | ret = -ENOMEM; |
3383 | goto rcu_error; | |
3384 | } | |
53efb85a MD |
3385 | /* Zero the new memory */ |
3386 | memset(new_tmp_event + nbmem, 0, | |
3387 | (new_nbmem - nbmem) * sizeof(struct lttng_event_field)); | |
3388 | nbmem = new_nbmem; | |
3389 | tmp_event = new_tmp_event; | |
f37d259d | 3390 | } |
f37d259d | 3391 | |
c617c0c6 | 3392 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
2e84128e DG |
3393 | /* Mapping between these enums matches 1 to 1. */ |
3394 | tmp_event[count].type = (enum lttng_event_field_type) uiter.type; | |
c617c0c6 | 3395 | tmp_event[count].nowrite = uiter.nowrite; |
f37d259d | 3396 | |
c617c0c6 MD |
3397 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
3398 | tmp_event[count].event.loglevel = uiter.loglevel; | |
2e84128e | 3399 | tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; |
c617c0c6 MD |
3400 | tmp_event[count].event.pid = app->pid; |
3401 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
3402 | count++; |
3403 | } | |
3404 | } | |
3405 | ||
3406 | ret = count; | |
c617c0c6 | 3407 | *fields = tmp_event; |
f37d259d MD |
3408 | |
3409 | DBG2("UST app list event fields done (%zu events)", count); | |
3410 | ||
3411 | rcu_error: | |
3412 | rcu_read_unlock(); | |
3413 | error: | |
840cb59c | 3414 | health_code_update(); |
f37d259d MD |
3415 | return ret; |
3416 | } | |
3417 | ||
5b4a0ec0 DG |
3418 | /* |
3419 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
3420 | * |
3421 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
3422 | */ |
3423 | void ust_app_clean_list(void) | |
421cb601 | 3424 | { |
5b4a0ec0 | 3425 | int ret; |
659ed79f | 3426 | struct ust_app *app; |
bec39940 | 3427 | struct lttng_ht_iter iter; |
421cb601 | 3428 | |
5b4a0ec0 | 3429 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3430 | |
5b4a0ec0 | 3431 | rcu_read_lock(); |
421cb601 | 3432 | |
f1b711c4 MD |
3433 | if (ust_app_ht) { |
3434 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3435 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3436 | assert(!ret); | |
3437 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
3438 | } | |
421cb601 DG |
3439 | } |
3440 | ||
852d0037 | 3441 | /* Cleanup socket hash table */ |
f1b711c4 MD |
3442 | if (ust_app_ht_by_sock) { |
3443 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, | |
3444 | sock_n.node) { | |
3445 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); | |
3446 | assert(!ret); | |
3447 | } | |
bec39940 | 3448 | } |
852d0037 | 3449 | |
d88aee68 | 3450 | /* Cleanup notify socket hash table */ |
f1b711c4 MD |
3451 | if (ust_app_ht_by_notify_sock) { |
3452 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3453 | notify_sock_n.node) { | |
3454 | ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3455 | assert(!ret); | |
3456 | } | |
d88aee68 | 3457 | } |
36b588ed | 3458 | rcu_read_unlock(); |
d88aee68 | 3459 | |
bec39940 | 3460 | /* Destroy is done only when the ht is empty */ |
f1b711c4 MD |
3461 | if (ust_app_ht) { |
3462 | ht_cleanup_push(ust_app_ht); | |
3463 | } | |
3464 | if (ust_app_ht_by_sock) { | |
3465 | ht_cleanup_push(ust_app_ht_by_sock); | |
3466 | } | |
3467 | if (ust_app_ht_by_notify_sock) { | |
3468 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
3469 | } | |
5b4a0ec0 DG |
3470 | } |
3471 | ||
3472 | /* | |
3473 | * Init UST app hash table. | |
3474 | */ | |
57703f6e | 3475 | int ust_app_ht_alloc(void) |
5b4a0ec0 | 3476 | { |
bec39940 | 3477 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3478 | if (!ust_app_ht) { |
3479 | return -1; | |
3480 | } | |
852d0037 | 3481 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3482 | if (!ust_app_ht_by_sock) { |
3483 | return -1; | |
3484 | } | |
d0b96690 | 3485 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3486 | if (!ust_app_ht_by_notify_sock) { |
3487 | return -1; | |
3488 | } | |
3489 | return 0; | |
421cb601 DG |
3490 | } |
3491 | ||
78f0bacd DG |
3492 | /* |
3493 | * For a specific UST session, disable the channel for all registered apps. | |
3494 | */ | |
35a9059d | 3495 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3496 | struct ltt_ust_channel *uchan) |
3497 | { | |
3498 | int ret = 0; | |
bec39940 DG |
3499 | struct lttng_ht_iter iter; |
3500 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3501 | struct ust_app *app; |
3502 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3503 | struct ust_app_channel *ua_chan; |
78f0bacd DG |
3504 | |
3505 | if (usess == NULL || uchan == NULL) { | |
3506 | ERR("Disabling UST global channel with NULL values"); | |
3507 | ret = -1; | |
3508 | goto error; | |
3509 | } | |
3510 | ||
d9bf3ca4 | 3511 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 3512 | uchan->name, usess->id); |
78f0bacd DG |
3513 | |
3514 | rcu_read_lock(); | |
3515 | ||
3516 | /* For every registered applications */ | |
852d0037 | 3517 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3518 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3519 | if (!app->compatible) { |
3520 | /* | |
3521 | * TODO: In time, we should notice the caller of this error by | |
3522 | * telling him that this is a version error. | |
3523 | */ | |
3524 | continue; | |
3525 | } | |
78f0bacd DG |
3526 | ua_sess = lookup_session_by_app(usess, app); |
3527 | if (ua_sess == NULL) { | |
3528 | continue; | |
3529 | } | |
3530 | ||
8535a6d9 | 3531 | /* Get channel */ |
bec39940 DG |
3532 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3533 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
3534 | /* If the session if found for the app, the channel must be there */ |
3535 | assert(ua_chan_node); | |
3536 | ||
3537 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3538 | /* The channel must not be already disabled */ | |
3539 | assert(ua_chan->enabled == 1); | |
3540 | ||
3541 | /* Disable channel onto application */ | |
3542 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
3543 | if (ret < 0) { |
3544 | /* XXX: We might want to report this error at some point... */ | |
3545 | continue; | |
3546 | } | |
3547 | } | |
3548 | ||
3549 | rcu_read_unlock(); | |
3550 | ||
3551 | error: | |
3552 | return ret; | |
3553 | } | |
3554 | ||
3555 | /* | |
3556 | * For a specific UST session, enable the channel for all registered apps. | |
3557 | */ | |
35a9059d | 3558 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3559 | struct ltt_ust_channel *uchan) |
3560 | { | |
3561 | int ret = 0; | |
bec39940 | 3562 | struct lttng_ht_iter iter; |
78f0bacd DG |
3563 | struct ust_app *app; |
3564 | struct ust_app_session *ua_sess; | |
3565 | ||
3566 | if (usess == NULL || uchan == NULL) { | |
3567 | ERR("Adding UST global channel to NULL values"); | |
3568 | ret = -1; | |
3569 | goto error; | |
3570 | } | |
3571 | ||
d9bf3ca4 | 3572 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 3573 | uchan->name, usess->id); |
78f0bacd DG |
3574 | |
3575 | rcu_read_lock(); | |
3576 | ||
3577 | /* For every registered applications */ | |
852d0037 | 3578 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3579 | if (!app->compatible) { |
3580 | /* | |
3581 | * TODO: In time, we should notice the caller of this error by | |
3582 | * telling him that this is a version error. | |
3583 | */ | |
3584 | continue; | |
3585 | } | |
78f0bacd DG |
3586 | ua_sess = lookup_session_by_app(usess, app); |
3587 | if (ua_sess == NULL) { | |
3588 | continue; | |
3589 | } | |
3590 | ||
3591 | /* Enable channel onto application */ | |
3592 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
3593 | if (ret < 0) { | |
3594 | /* XXX: We might want to report this error at some point... */ | |
3595 | continue; | |
3596 | } | |
3597 | } | |
3598 | ||
3599 | rcu_read_unlock(); | |
3600 | ||
3601 | error: | |
3602 | return ret; | |
3603 | } | |
3604 | ||
b0a40d28 DG |
3605 | /* |
3606 | * Disable an event in a channel and for a specific session. | |
3607 | */ | |
35a9059d DG |
3608 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
3609 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
3610 | { |
3611 | int ret = 0; | |
bec39940 DG |
3612 | struct lttng_ht_iter iter, uiter; |
3613 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
b0a40d28 DG |
3614 | struct ust_app *app; |
3615 | struct ust_app_session *ua_sess; | |
3616 | struct ust_app_channel *ua_chan; | |
3617 | struct ust_app_event *ua_event; | |
3618 | ||
3619 | DBG("UST app disabling event %s for all apps in channel " | |
d9bf3ca4 MD |
3620 | "%s for session id %" PRIu64, |
3621 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
3622 | |
3623 | rcu_read_lock(); | |
3624 | ||
3625 | /* For all registered applications */ | |
852d0037 | 3626 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3627 | if (!app->compatible) { |
3628 | /* | |
3629 | * TODO: In time, we should notice the caller of this error by | |
3630 | * telling him that this is a version error. | |
3631 | */ | |
3632 | continue; | |
3633 | } | |
b0a40d28 DG |
3634 | ua_sess = lookup_session_by_app(usess, app); |
3635 | if (ua_sess == NULL) { | |
3636 | /* Next app */ | |
3637 | continue; | |
3638 | } | |
3639 | ||
3640 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3641 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3642 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 3643 | if (ua_chan_node == NULL) { |
d9bf3ca4 | 3644 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 3645 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
3646 | continue; |
3647 | } | |
3648 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3649 | ||
bec39940 DG |
3650 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter); |
3651 | ua_event_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 DG |
3652 | if (ua_event_node == NULL) { |
3653 | DBG2("Event %s not found in channel %s for app pid %d." | |
852d0037 | 3654 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
3655 | continue; |
3656 | } | |
3657 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
3658 | ||
7f79d3a1 | 3659 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
3660 | if (ret < 0) { |
3661 | /* XXX: Report error someday... */ | |
3662 | continue; | |
3663 | } | |
3664 | } | |
3665 | ||
3666 | rcu_read_unlock(); | |
3667 | ||
3668 | return ret; | |
3669 | } | |
3670 | ||
421cb601 | 3671 | /* |
5b4a0ec0 | 3672 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 3673 | */ |
35a9059d | 3674 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3675 | struct ltt_ust_channel *uchan) |
3676 | { | |
3d8ca23b | 3677 | int ret = 0, created; |
bec39940 | 3678 | struct lttng_ht_iter iter; |
48842b30 | 3679 | struct ust_app *app; |
3d8ca23b | 3680 | struct ust_app_session *ua_sess = NULL; |
48842b30 | 3681 | |
fc34caaa DG |
3682 | /* Very wrong code flow */ |
3683 | assert(usess); | |
3684 | assert(uchan); | |
421cb601 | 3685 | |
d9bf3ca4 | 3686 | DBG2("UST app adding channel %s to UST domain for session id %" PRIu64, |
a991f516 | 3687 | uchan->name, usess->id); |
48842b30 DG |
3688 | |
3689 | rcu_read_lock(); | |
421cb601 | 3690 | |
5b4a0ec0 | 3691 | /* For every registered applications */ |
852d0037 | 3692 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3693 | if (!app->compatible) { |
3694 | /* | |
3695 | * TODO: In time, we should notice the caller of this error by | |
3696 | * telling him that this is a version error. | |
3697 | */ | |
3698 | continue; | |
3699 | } | |
edb67388 DG |
3700 | /* |
3701 | * Create session on the tracer side and add it to app session HT. Note | |
3702 | * that if session exist, it will simply return a pointer to the ust | |
3703 | * app session. | |
3704 | */ | |
3d8ca23b DG |
3705 | ret = create_ust_app_session(usess, app, &ua_sess, &created); |
3706 | if (ret < 0) { | |
3707 | switch (ret) { | |
3708 | case -ENOTCONN: | |
3709 | /* | |
3710 | * The application's socket is not valid. Either a bad socket | |
3711 | * or a timeout on it. We can't inform the caller that for a | |
3712 | * specific app, the session failed so lets continue here. | |
3713 | */ | |
3714 | continue; | |
3715 | case -ENOMEM: | |
3716 | default: | |
3717 | goto error_rcu_unlock; | |
3718 | } | |
48842b30 | 3719 | } |
3d8ca23b | 3720 | assert(ua_sess); |
48842b30 | 3721 | |
d0b96690 | 3722 | pthread_mutex_lock(&ua_sess->lock); |
d65d2de8 DG |
3723 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, |
3724 | sizeof(uchan->name))) { | |
ad7a9107 DG |
3725 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, &uchan->attr); |
3726 | ret = 0; | |
d65d2de8 DG |
3727 | } else { |
3728 | /* Create channel onto application. We don't need the chan ref. */ | |
3729 | ret = create_ust_app_channel(ua_sess, uchan, app, | |
3730 | LTTNG_UST_CHAN_PER_CPU, usess, NULL); | |
3731 | } | |
d0b96690 | 3732 | pthread_mutex_unlock(&ua_sess->lock); |
3d8ca23b DG |
3733 | if (ret < 0) { |
3734 | if (ret == -ENOMEM) { | |
3735 | /* No more memory is a fatal error. Stop right now. */ | |
3736 | goto error_rcu_unlock; | |
3737 | } | |
3738 | /* Cleanup the created session if it's the case. */ | |
3739 | if (created) { | |
d0b96690 | 3740 | destroy_app_session(app, ua_sess); |
3d8ca23b | 3741 | } |
48842b30 | 3742 | } |
48842b30 | 3743 | } |
5b4a0ec0 | 3744 | |
95e047ff | 3745 | error_rcu_unlock: |
48842b30 | 3746 | rcu_read_unlock(); |
3c14c33f | 3747 | return ret; |
48842b30 DG |
3748 | } |
3749 | ||
5b4a0ec0 | 3750 | /* |
edb67388 | 3751 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 3752 | */ |
35a9059d | 3753 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3754 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3755 | { | |
3756 | int ret = 0; | |
bec39940 | 3757 | struct lttng_ht_iter iter, uiter; |
18eace3b | 3758 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
3759 | struct ust_app *app; |
3760 | struct ust_app_session *ua_sess; | |
3761 | struct ust_app_channel *ua_chan; | |
3762 | struct ust_app_event *ua_event; | |
48842b30 | 3763 | |
d9bf3ca4 | 3764 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 3765 | uevent->attr.name, usess->id); |
48842b30 | 3766 | |
edb67388 DG |
3767 | /* |
3768 | * NOTE: At this point, this function is called only if the session and | |
3769 | * channel passed are already created for all apps. and enabled on the | |
3770 | * tracer also. | |
3771 | */ | |
3772 | ||
48842b30 | 3773 | rcu_read_lock(); |
421cb601 DG |
3774 | |
3775 | /* For all registered applications */ | |
852d0037 | 3776 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3777 | if (!app->compatible) { |
3778 | /* | |
3779 | * TODO: In time, we should notice the caller of this error by | |
3780 | * telling him that this is a version error. | |
3781 | */ | |
3782 | continue; | |
3783 | } | |
edb67388 | 3784 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3785 | if (!ua_sess) { |
3786 | /* The application has problem or is probably dead. */ | |
3787 | continue; | |
3788 | } | |
ba767faf | 3789 | |
d0b96690 DG |
3790 | pthread_mutex_lock(&ua_sess->lock); |
3791 | ||
edb67388 | 3792 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3793 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3794 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3795 | /* If the channel is not found, there is a code flow error */ |
3796 | assert(ua_chan_node); | |
3797 | ||
3798 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3799 | ||
18eace3b DG |
3800 | /* Get event node */ |
3801 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
39c5a3a7 | 3802 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 3803 | if (ua_event == NULL) { |
7f79d3a1 | 3804 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 3805 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 3806 | goto next_app; |
35a9059d | 3807 | } |
35a9059d DG |
3808 | |
3809 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
3810 | if (ret < 0) { | |
d0b96690 | 3811 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 3812 | goto error; |
48842b30 | 3813 | } |
d0b96690 DG |
3814 | next_app: |
3815 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
3816 | } |
3817 | ||
7f79d3a1 | 3818 | error: |
edb67388 | 3819 | rcu_read_unlock(); |
edb67388 DG |
3820 | return ret; |
3821 | } | |
3822 | ||
3823 | /* | |
3824 | * For a specific existing UST session and UST channel, creates the event for | |
3825 | * all registered apps. | |
3826 | */ | |
35a9059d | 3827 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
3828 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3829 | { | |
3830 | int ret = 0; | |
bec39940 DG |
3831 | struct lttng_ht_iter iter, uiter; |
3832 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
3833 | struct ust_app *app; |
3834 | struct ust_app_session *ua_sess; | |
3835 | struct ust_app_channel *ua_chan; | |
3836 | ||
d9bf3ca4 | 3837 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 3838 | uevent->attr.name, usess->id); |
edb67388 | 3839 | |
edb67388 DG |
3840 | rcu_read_lock(); |
3841 | ||
3842 | /* For all registered applications */ | |
852d0037 | 3843 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3844 | if (!app->compatible) { |
3845 | /* | |
3846 | * TODO: In time, we should notice the caller of this error by | |
3847 | * telling him that this is a version error. | |
3848 | */ | |
3849 | continue; | |
3850 | } | |
edb67388 | 3851 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3852 | if (!ua_sess) { |
3853 | /* The application has problem or is probably dead. */ | |
3854 | continue; | |
3855 | } | |
48842b30 | 3856 | |
d0b96690 | 3857 | pthread_mutex_lock(&ua_sess->lock); |
48842b30 | 3858 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3859 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3860 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3861 | /* If the channel is not found, there is a code flow error */ |
3862 | assert(ua_chan_node); | |
3863 | ||
48842b30 DG |
3864 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3865 | ||
edb67388 | 3866 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 3867 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 3868 | if (ret < 0) { |
49c336c1 | 3869 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
3870 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
3871 | break; | |
3872 | } | |
3873 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 3874 | uevent->attr.name, app->pid); |
5b4a0ec0 | 3875 | continue; |
48842b30 | 3876 | } |
48842b30 | 3877 | } |
5b4a0ec0 | 3878 | |
48842b30 DG |
3879 | rcu_read_unlock(); |
3880 | ||
3881 | return ret; | |
3882 | } | |
3883 | ||
5b4a0ec0 DG |
3884 | /* |
3885 | * Start tracing for a specific UST session and app. | |
3886 | */ | |
b34cbebf | 3887 | static |
421cb601 | 3888 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
3889 | { |
3890 | int ret = 0; | |
48842b30 | 3891 | struct ust_app_session *ua_sess; |
48842b30 | 3892 | |
852d0037 | 3893 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 3894 | |
509cbaf8 MD |
3895 | rcu_read_lock(); |
3896 | ||
e0c7ec2b DG |
3897 | if (!app->compatible) { |
3898 | goto end; | |
3899 | } | |
3900 | ||
421cb601 DG |
3901 | ua_sess = lookup_session_by_app(usess, app); |
3902 | if (ua_sess == NULL) { | |
d42f20df DG |
3903 | /* The session is in teardown process. Ignore and continue. */ |
3904 | goto end; | |
421cb601 | 3905 | } |
48842b30 | 3906 | |
d0b96690 DG |
3907 | pthread_mutex_lock(&ua_sess->lock); |
3908 | ||
aea829b3 DG |
3909 | /* Upon restart, we skip the setup, already done */ |
3910 | if (ua_sess->started) { | |
8be98f9a | 3911 | goto skip_setup; |
aea829b3 | 3912 | } |
8be98f9a | 3913 | |
a4b92340 DG |
3914 | /* Create directories if consumer is LOCAL and has a path defined. */ |
3915 | if (usess->consumer->type == CONSUMER_DST_LOCAL && | |
3916 | strlen(usess->consumer->dst.trace_path) > 0) { | |
3917 | ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path, | |
7972aab2 | 3918 | S_IRWXU | S_IRWXG, ua_sess->euid, ua_sess->egid); |
a4b92340 DG |
3919 | if (ret < 0) { |
3920 | if (ret != -EEXIST) { | |
3921 | ERR("Trace directory creation error"); | |
d0b96690 | 3922 | goto error_unlock; |
421cb601 | 3923 | } |
173af62f | 3924 | } |
7753dea8 | 3925 | } |
aea829b3 | 3926 | |
d65d2de8 DG |
3927 | /* |
3928 | * Create the metadata for the application. This returns gracefully if a | |
3929 | * metadata was already set for the session. | |
3930 | */ | |
ad7a9107 | 3931 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer); |
421cb601 | 3932 | if (ret < 0) { |
d0b96690 | 3933 | goto error_unlock; |
421cb601 | 3934 | } |
48842b30 | 3935 | |
840cb59c | 3936 | health_code_update(); |
86acf0da | 3937 | |
8be98f9a | 3938 | skip_setup: |
421cb601 | 3939 | /* This start the UST tracing */ |
852d0037 | 3940 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
421cb601 | 3941 | if (ret < 0) { |
ffe60014 DG |
3942 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3943 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
3944 | app->pid, ret); | |
3945 | } else { | |
3946 | DBG("UST app start session failed. Application is dead."); | |
3757b385 DG |
3947 | /* |
3948 | * This is normal behavior, an application can die during the | |
3949 | * creation process. Don't report an error so the execution can | |
3950 | * continue normally. | |
3951 | */ | |
3952 | pthread_mutex_unlock(&ua_sess->lock); | |
3953 | goto end; | |
ffe60014 | 3954 | } |
d0b96690 | 3955 | goto error_unlock; |
421cb601 | 3956 | } |
5b4a0ec0 | 3957 | |
55c3953d DG |
3958 | /* Indicate that the session has been started once */ |
3959 | ua_sess->started = 1; | |
3960 | ||
d0b96690 DG |
3961 | pthread_mutex_unlock(&ua_sess->lock); |
3962 | ||
840cb59c | 3963 | health_code_update(); |
86acf0da | 3964 | |
421cb601 | 3965 | /* Quiescent wait after starting trace */ |
ffe60014 DG |
3966 | ret = ustctl_wait_quiescent(app->sock); |
3967 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3968 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3969 | app->pid, ret); | |
3970 | } | |
48842b30 | 3971 | |
e0c7ec2b DG |
3972 | end: |
3973 | rcu_read_unlock(); | |
840cb59c | 3974 | health_code_update(); |
421cb601 | 3975 | return 0; |
48842b30 | 3976 | |
d0b96690 DG |
3977 | error_unlock: |
3978 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 3979 | rcu_read_unlock(); |
840cb59c | 3980 | health_code_update(); |
421cb601 DG |
3981 | return -1; |
3982 | } | |
48842b30 | 3983 | |
8be98f9a MD |
3984 | /* |
3985 | * Stop tracing for a specific UST session and app. | |
3986 | */ | |
b34cbebf | 3987 | static |
8be98f9a MD |
3988 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
3989 | { | |
3990 | int ret = 0; | |
3991 | struct ust_app_session *ua_sess; | |
7972aab2 | 3992 | struct ust_registry_session *registry; |
8be98f9a | 3993 | |
852d0037 | 3994 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
3995 | |
3996 | rcu_read_lock(); | |
3997 | ||
e0c7ec2b | 3998 | if (!app->compatible) { |
d88aee68 | 3999 | goto end_no_session; |
e0c7ec2b DG |
4000 | } |
4001 | ||
8be98f9a MD |
4002 | ua_sess = lookup_session_by_app(usess, app); |
4003 | if (ua_sess == NULL) { | |
d88aee68 | 4004 | goto end_no_session; |
8be98f9a MD |
4005 | } |
4006 | ||
d88aee68 DG |
4007 | pthread_mutex_lock(&ua_sess->lock); |
4008 | ||
9bc07046 DG |
4009 | /* |
4010 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
4011 | * that was never started. It's possible since we can have a fail start |
4012 | * from either the application manager thread or the command thread. Simply | |
4013 | * indicate that this is a stop error. | |
9bc07046 | 4014 | */ |
f9dfc3d9 | 4015 | if (!ua_sess->started) { |
c45536e1 DG |
4016 | goto error_rcu_unlock; |
4017 | } | |
7db205b5 | 4018 | |
840cb59c | 4019 | health_code_update(); |
86acf0da | 4020 | |
9d6c7d3f | 4021 | /* This inhibits UST tracing */ |
852d0037 | 4022 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
9d6c7d3f | 4023 | if (ret < 0) { |
ffe60014 DG |
4024 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4025 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
4026 | app->pid, ret); | |
4027 | } else { | |
4028 | DBG("UST app stop session failed. Application is dead."); | |
3757b385 DG |
4029 | /* |
4030 | * This is normal behavior, an application can die during the | |
4031 | * creation process. Don't report an error so the execution can | |
4032 | * continue normally. | |
4033 | */ | |
4034 | goto end_unlock; | |
ffe60014 | 4035 | } |
9d6c7d3f DG |
4036 | goto error_rcu_unlock; |
4037 | } | |
4038 | ||
840cb59c | 4039 | health_code_update(); |
86acf0da | 4040 | |
9d6c7d3f | 4041 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
4042 | ret = ustctl_wait_quiescent(app->sock); |
4043 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4044 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4045 | app->pid, ret); | |
4046 | } | |
9d6c7d3f | 4047 | |
840cb59c | 4048 | health_code_update(); |
86acf0da | 4049 | |
b34cbebf MD |
4050 | registry = get_session_registry(ua_sess); |
4051 | assert(registry); | |
1b532a60 | 4052 | |
ce34fcd0 MD |
4053 | /* Push metadata for application before freeing the application. */ |
4054 | (void) push_metadata(registry, ua_sess->consumer); | |
b34cbebf | 4055 | |
3757b385 | 4056 | end_unlock: |
b34cbebf MD |
4057 | pthread_mutex_unlock(&ua_sess->lock); |
4058 | end_no_session: | |
4059 | rcu_read_unlock(); | |
4060 | health_code_update(); | |
4061 | return 0; | |
4062 | ||
4063 | error_rcu_unlock: | |
4064 | pthread_mutex_unlock(&ua_sess->lock); | |
4065 | rcu_read_unlock(); | |
4066 | health_code_update(); | |
4067 | return -1; | |
4068 | } | |
4069 | ||
b34cbebf | 4070 | static |
c4b88406 MD |
4071 | int ust_app_flush_app_session(struct ust_app *app, |
4072 | struct ust_app_session *ua_sess) | |
b34cbebf | 4073 | { |
c4b88406 | 4074 | int ret, retval = 0; |
b34cbebf | 4075 | struct lttng_ht_iter iter; |
b34cbebf | 4076 | struct ust_app_channel *ua_chan; |
c4b88406 | 4077 | struct consumer_socket *socket; |
b34cbebf | 4078 | |
c4b88406 | 4079 | DBG("Flushing app session buffers for ust app pid %d", app->pid); |
b34cbebf MD |
4080 | |
4081 | rcu_read_lock(); | |
4082 | ||
4083 | if (!app->compatible) { | |
c4b88406 | 4084 | goto end_not_compatible; |
b34cbebf MD |
4085 | } |
4086 | ||
4087 | pthread_mutex_lock(&ua_sess->lock); | |
4088 | ||
4089 | health_code_update(); | |
4090 | ||
9d6c7d3f | 4091 | /* Flushing buffers */ |
c4b88406 MD |
4092 | socket = consumer_find_socket_by_bitness(app->bits_per_long, |
4093 | ua_sess->consumer); | |
ce34fcd0 MD |
4094 | |
4095 | /* Flush buffers and push metadata. */ | |
4096 | switch (ua_sess->buffer_type) { | |
4097 | case LTTNG_BUFFER_PER_PID: | |
4098 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, | |
4099 | node.node) { | |
4100 | health_code_update(); | |
4101 | assert(ua_chan->is_sent); | |
4102 | ret = consumer_flush_channel(socket, ua_chan->key); | |
4103 | if (ret) { | |
4104 | ERR("Error flushing consumer channel"); | |
4105 | retval = -1; | |
4106 | continue; | |
4107 | } | |
8be98f9a | 4108 | } |
ce34fcd0 MD |
4109 | break; |
4110 | case LTTNG_BUFFER_PER_UID: | |
4111 | default: | |
4112 | assert(0); | |
4113 | break; | |
8be98f9a | 4114 | } |
8be98f9a | 4115 | |
840cb59c | 4116 | health_code_update(); |
86acf0da | 4117 | |
d88aee68 | 4118 | pthread_mutex_unlock(&ua_sess->lock); |
ce34fcd0 | 4119 | |
c4b88406 MD |
4120 | end_not_compatible: |
4121 | rcu_read_unlock(); | |
4122 | health_code_update(); | |
4123 | return retval; | |
4124 | } | |
4125 | ||
4126 | /* | |
ce34fcd0 MD |
4127 | * Flush buffers for all applications for a specific UST session. |
4128 | * Called with UST session lock held. | |
c4b88406 MD |
4129 | */ |
4130 | static | |
ce34fcd0 | 4131 | int ust_app_flush_session(struct ltt_ust_session *usess) |
c4b88406 MD |
4132 | |
4133 | { | |
4134 | int ret; | |
c4b88406 | 4135 | |
ce34fcd0 | 4136 | DBG("Flushing session buffers for all ust apps"); |
c4b88406 MD |
4137 | |
4138 | rcu_read_lock(); | |
4139 | ||
ce34fcd0 MD |
4140 | /* Flush buffers and push metadata. */ |
4141 | switch (usess->buffer_type) { | |
4142 | case LTTNG_BUFFER_PER_UID: | |
4143 | { | |
4144 | struct buffer_reg_uid *reg; | |
4145 | struct lttng_ht_iter iter; | |
4146 | ||
4147 | /* Flush all per UID buffers associated to that session. */ | |
4148 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
4149 | struct ust_registry_session *ust_session_reg; | |
4150 | struct buffer_reg_channel *reg_chan; | |
4151 | struct consumer_socket *socket; | |
4152 | ||
4153 | /* Get consumer socket to use to push the metadata.*/ | |
4154 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
4155 | usess->consumer); | |
4156 | if (!socket) { | |
4157 | /* Ignore request if no consumer is found for the session. */ | |
4158 | continue; | |
4159 | } | |
4160 | ||
4161 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
4162 | reg_chan, node.node) { | |
4163 | /* | |
4164 | * The following call will print error values so the return | |
4165 | * code is of little importance because whatever happens, we | |
4166 | * have to try them all. | |
4167 | */ | |
4168 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
4169 | } | |
4170 | ||
4171 | ust_session_reg = reg->registry->reg.ust; | |
4172 | /* Push metadata. */ | |
4173 | (void) push_metadata(ust_session_reg, usess->consumer); | |
4174 | } | |
4175 | ret = 0; | |
4176 | break; | |
4177 | } | |
4178 | case LTTNG_BUFFER_PER_PID: | |
4179 | { | |
4180 | struct ust_app_session *ua_sess; | |
4181 | struct lttng_ht_iter iter; | |
4182 | struct ust_app *app; | |
4183 | ||
4184 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4185 | ua_sess = lookup_session_by_app(usess, app); | |
4186 | if (ua_sess == NULL) { | |
4187 | continue; | |
4188 | } | |
4189 | (void) ust_app_flush_app_session(app, ua_sess); | |
4190 | } | |
4191 | break; | |
4192 | } | |
4193 | default: | |
4194 | assert(0); | |
4195 | break; | |
c4b88406 | 4196 | } |
c4b88406 | 4197 | |
d88aee68 | 4198 | end_no_session: |
7db205b5 | 4199 | rcu_read_unlock(); |
840cb59c | 4200 | health_code_update(); |
c4b88406 | 4201 | return ret; |
8be98f9a MD |
4202 | } |
4203 | ||
84cd17c6 MD |
4204 | /* |
4205 | * Destroy a specific UST session in apps. | |
4206 | */ | |
3353de95 | 4207 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 4208 | { |
ffe60014 | 4209 | int ret; |
84cd17c6 | 4210 | struct ust_app_session *ua_sess; |
bec39940 | 4211 | struct lttng_ht_iter iter; |
d9bf3ca4 | 4212 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 4213 | |
852d0037 | 4214 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
4215 | |
4216 | rcu_read_lock(); | |
4217 | ||
e0c7ec2b DG |
4218 | if (!app->compatible) { |
4219 | goto end; | |
4220 | } | |
4221 | ||
84cd17c6 | 4222 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 4223 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 4224 | if (node == NULL) { |
d42f20df DG |
4225 | /* Session is being or is deleted. */ |
4226 | goto end; | |
84cd17c6 MD |
4227 | } |
4228 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 4229 | |
840cb59c | 4230 | health_code_update(); |
d0b96690 | 4231 | destroy_app_session(app, ua_sess); |
84cd17c6 | 4232 | |
840cb59c | 4233 | health_code_update(); |
7db205b5 | 4234 | |
84cd17c6 | 4235 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
4236 | ret = ustctl_wait_quiescent(app->sock); |
4237 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4238 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4239 | app->pid, ret); | |
4240 | } | |
e0c7ec2b DG |
4241 | end: |
4242 | rcu_read_unlock(); | |
840cb59c | 4243 | health_code_update(); |
84cd17c6 | 4244 | return 0; |
84cd17c6 MD |
4245 | } |
4246 | ||
5b4a0ec0 DG |
4247 | /* |
4248 | * Start tracing for the UST session. | |
4249 | */ | |
421cb601 DG |
4250 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
4251 | { | |
4252 | int ret = 0; | |
bec39940 | 4253 | struct lttng_ht_iter iter; |
421cb601 | 4254 | struct ust_app *app; |
48842b30 | 4255 | |
421cb601 DG |
4256 | DBG("Starting all UST traces"); |
4257 | ||
4258 | rcu_read_lock(); | |
421cb601 | 4259 | |
852d0037 | 4260 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
421cb601 | 4261 | ret = ust_app_start_trace(usess, app); |
48842b30 | 4262 | if (ret < 0) { |
5b4a0ec0 DG |
4263 | /* Continue to next apps even on error */ |
4264 | continue; | |
48842b30 | 4265 | } |
48842b30 | 4266 | } |
5b4a0ec0 | 4267 | |
48842b30 DG |
4268 | rcu_read_unlock(); |
4269 | ||
4270 | return 0; | |
4271 | } | |
487cf67c | 4272 | |
8be98f9a MD |
4273 | /* |
4274 | * Start tracing for the UST session. | |
ce34fcd0 | 4275 | * Called with UST session lock held. |
8be98f9a MD |
4276 | */ |
4277 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
4278 | { | |
4279 | int ret = 0; | |
bec39940 | 4280 | struct lttng_ht_iter iter; |
8be98f9a MD |
4281 | struct ust_app *app; |
4282 | ||
4283 | DBG("Stopping all UST traces"); | |
4284 | ||
4285 | rcu_read_lock(); | |
4286 | ||
b34cbebf MD |
4287 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4288 | ret = ust_app_stop_trace(usess, app); | |
4289 | if (ret < 0) { | |
4290 | /* Continue to next apps even on error */ | |
4291 | continue; | |
4292 | } | |
4293 | } | |
4294 | ||
ce34fcd0 | 4295 | (void) ust_app_flush_session(usess); |
8be98f9a MD |
4296 | |
4297 | rcu_read_unlock(); | |
4298 | ||
4299 | return 0; | |
4300 | } | |
4301 | ||
84cd17c6 MD |
4302 | /* |
4303 | * Destroy app UST session. | |
4304 | */ | |
4305 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
4306 | { | |
4307 | int ret = 0; | |
bec39940 | 4308 | struct lttng_ht_iter iter; |
84cd17c6 MD |
4309 | struct ust_app *app; |
4310 | ||
4311 | DBG("Destroy all UST traces"); | |
4312 | ||
4313 | rcu_read_lock(); | |
4314 | ||
852d0037 | 4315 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 4316 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
4317 | if (ret < 0) { |
4318 | /* Continue to next apps even on error */ | |
4319 | continue; | |
4320 | } | |
4321 | } | |
4322 | ||
4323 | rcu_read_unlock(); | |
4324 | ||
4325 | return 0; | |
4326 | } | |
4327 | ||
5b4a0ec0 DG |
4328 | /* |
4329 | * Add channels/events from UST global domain to registered apps at sock. | |
4330 | */ | |
487cf67c DG |
4331 | void ust_app_global_update(struct ltt_ust_session *usess, int sock) |
4332 | { | |
55c54cce | 4333 | int ret = 0; |
31746f93 | 4334 | struct lttng_ht_iter iter, uiter; |
487cf67c | 4335 | struct ust_app *app; |
3d8ca23b | 4336 | struct ust_app_session *ua_sess = NULL; |
487cf67c DG |
4337 | struct ust_app_channel *ua_chan; |
4338 | struct ust_app_event *ua_event; | |
727d5404 | 4339 | struct ust_app_ctx *ua_ctx; |
1f3580c7 | 4340 | |
95e047ff | 4341 | assert(usess); |
ffe60014 | 4342 | assert(sock >= 0); |
1f3580c7 | 4343 | |
d9bf3ca4 | 4344 | DBG2("UST app global update for app sock %d for session id %" PRIu64, sock, |
a991f516 | 4345 | usess->id); |
487cf67c | 4346 | |
284d8f55 DG |
4347 | rcu_read_lock(); |
4348 | ||
f20baf8e | 4349 | app = ust_app_find_by_sock(sock); |
487cf67c | 4350 | if (app == NULL) { |
d88aee68 DG |
4351 | /* |
4352 | * Application can be unregistered before so this is possible hence | |
4353 | * simply stopping the update. | |
4354 | */ | |
4355 | DBG3("UST app update failed to find app sock %d", sock); | |
487cf67c DG |
4356 | goto error; |
4357 | } | |
4358 | ||
e0c7ec2b DG |
4359 | if (!app->compatible) { |
4360 | goto error; | |
4361 | } | |
4362 | ||
3d8ca23b DG |
4363 | ret = create_ust_app_session(usess, app, &ua_sess, NULL); |
4364 | if (ret < 0) { | |
4365 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
4366 | goto error; |
4367 | } | |
3d8ca23b | 4368 | assert(ua_sess); |
487cf67c | 4369 | |
d0b96690 DG |
4370 | pthread_mutex_lock(&ua_sess->lock); |
4371 | ||
284d8f55 | 4372 | /* |
d0b96690 | 4373 | * We can iterate safely here over all UST app session since the create ust |
284d8f55 DG |
4374 | * app session above made a shadow copy of the UST global domain from the |
4375 | * ltt ust session. | |
4376 | */ | |
bec39940 DG |
4377 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
4378 | node.node) { | |
ad7a9107 DG |
4379 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
4380 | if (ret < 0) { | |
4381 | /* | |
4382 | * Stop everything. On error, the application failed, no more | |
4383 | * file descriptor are available or ENOMEM so stopping here is | |
4384 | * the only thing we can do for now. | |
4385 | */ | |
4386 | goto error_unlock; | |
487cf67c DG |
4387 | } |
4388 | ||
31746f93 DG |
4389 | /* |
4390 | * Add context using the list so they are enabled in the same order the | |
4391 | * user added them. | |
4392 | */ | |
4393 | cds_list_for_each_entry(ua_ctx, &ua_chan->ctx_list, list) { | |
727d5404 DG |
4394 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); |
4395 | if (ret < 0) { | |
d0b96690 | 4396 | goto error_unlock; |
727d5404 DG |
4397 | } |
4398 | } | |
4399 | ||
4400 | ||
284d8f55 | 4401 | /* For each events */ |
bec39940 DG |
4402 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
4403 | node.node) { | |
284d8f55 DG |
4404 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
4405 | if (ret < 0) { | |
d0b96690 | 4406 | goto error_unlock; |
487cf67c | 4407 | } |
36dc12cc | 4408 | } |
487cf67c DG |
4409 | } |
4410 | ||
d0b96690 DG |
4411 | pthread_mutex_unlock(&ua_sess->lock); |
4412 | ||
14fb1ebe | 4413 | if (usess->active) { |
421cb601 | 4414 | ret = ust_app_start_trace(usess, app); |
36dc12cc | 4415 | if (ret < 0) { |
36dc12cc DG |
4416 | goto error; |
4417 | } | |
4418 | ||
852d0037 | 4419 | DBG2("UST trace started for app pid %d", app->pid); |
36dc12cc DG |
4420 | } |
4421 | ||
ffe60014 DG |
4422 | /* Everything went well at this point. */ |
4423 | rcu_read_unlock(); | |
4424 | return; | |
4425 | ||
d0b96690 DG |
4426 | error_unlock: |
4427 | pthread_mutex_unlock(&ua_sess->lock); | |
487cf67c | 4428 | error: |
ffe60014 | 4429 | if (ua_sess) { |
d0b96690 | 4430 | destroy_app_session(app, ua_sess); |
ffe60014 | 4431 | } |
487cf67c DG |
4432 | rcu_read_unlock(); |
4433 | return; | |
4434 | } | |
55cc08a6 DG |
4435 | |
4436 | /* | |
4437 | * Add context to a specific channel for global UST domain. | |
4438 | */ | |
4439 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
4440 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
4441 | { | |
4442 | int ret = 0; | |
bec39940 DG |
4443 | struct lttng_ht_node_str *ua_chan_node; |
4444 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
4445 | struct ust_app_channel *ua_chan = NULL; |
4446 | struct ust_app_session *ua_sess; | |
4447 | struct ust_app *app; | |
4448 | ||
4449 | rcu_read_lock(); | |
4450 | ||
852d0037 | 4451 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4452 | if (!app->compatible) { |
4453 | /* | |
4454 | * TODO: In time, we should notice the caller of this error by | |
4455 | * telling him that this is a version error. | |
4456 | */ | |
4457 | continue; | |
4458 | } | |
55cc08a6 DG |
4459 | ua_sess = lookup_session_by_app(usess, app); |
4460 | if (ua_sess == NULL) { | |
4461 | continue; | |
4462 | } | |
4463 | ||
d0b96690 | 4464 | pthread_mutex_lock(&ua_sess->lock); |
55cc08a6 | 4465 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4466 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4467 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 4468 | if (ua_chan_node == NULL) { |
d0b96690 | 4469 | goto next_app; |
55cc08a6 DG |
4470 | } |
4471 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
4472 | node); | |
55cc08a6 DG |
4473 | ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app); |
4474 | if (ret < 0) { | |
d0b96690 | 4475 | goto next_app; |
55cc08a6 | 4476 | } |
d0b96690 DG |
4477 | next_app: |
4478 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
4479 | } |
4480 | ||
55cc08a6 DG |
4481 | rcu_read_unlock(); |
4482 | return ret; | |
4483 | } | |
4484 | ||
76d45b40 DG |
4485 | /* |
4486 | * Enable event for a channel from a UST session for a specific PID. | |
4487 | */ | |
4488 | int ust_app_enable_event_pid(struct ltt_ust_session *usess, | |
4489 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4490 | { | |
4491 | int ret = 0; | |
bec39940 | 4492 | struct lttng_ht_iter iter; |
18eace3b | 4493 | struct lttng_ht_node_str *ua_chan_node; |
76d45b40 DG |
4494 | struct ust_app *app; |
4495 | struct ust_app_session *ua_sess; | |
4496 | struct ust_app_channel *ua_chan; | |
4497 | struct ust_app_event *ua_event; | |
4498 | ||
4499 | DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid); | |
4500 | ||
4501 | rcu_read_lock(); | |
4502 | ||
4503 | app = ust_app_find_by_pid(pid); | |
4504 | if (app == NULL) { | |
4505 | ERR("UST app enable event per PID %d not found", pid); | |
4506 | ret = -1; | |
d0b96690 | 4507 | goto end; |
76d45b40 DG |
4508 | } |
4509 | ||
e0c7ec2b DG |
4510 | if (!app->compatible) { |
4511 | ret = 0; | |
d0b96690 | 4512 | goto end; |
e0c7ec2b DG |
4513 | } |
4514 | ||
76d45b40 | 4515 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4516 | if (!ua_sess) { |
4517 | /* The application has problem or is probably dead. */ | |
d0b96690 DG |
4518 | ret = 0; |
4519 | goto end; | |
c4a1715b | 4520 | } |
76d45b40 | 4521 | |
d0b96690 | 4522 | pthread_mutex_lock(&ua_sess->lock); |
76d45b40 | 4523 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4524 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4525 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
76d45b40 DG |
4526 | /* If the channel is not found, there is a code flow error */ |
4527 | assert(ua_chan_node); | |
4528 | ||
4529 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4530 | ||
18eace3b | 4531 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 4532 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 4533 | if (ua_event == NULL) { |
76d45b40 DG |
4534 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
4535 | if (ret < 0) { | |
d0b96690 | 4536 | goto end_unlock; |
76d45b40 DG |
4537 | } |
4538 | } else { | |
76d45b40 DG |
4539 | ret = enable_ust_app_event(ua_sess, ua_event, app); |
4540 | if (ret < 0) { | |
d0b96690 | 4541 | goto end_unlock; |
76d45b40 DG |
4542 | } |
4543 | } | |
4544 | ||
d0b96690 DG |
4545 | end_unlock: |
4546 | pthread_mutex_unlock(&ua_sess->lock); | |
4547 | end: | |
76d45b40 DG |
4548 | rcu_read_unlock(); |
4549 | return ret; | |
4550 | } | |
7f79d3a1 | 4551 | |
4466912f DG |
4552 | /* |
4553 | * Calibrate registered applications. | |
4554 | */ | |
4555 | int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate) | |
4556 | { | |
4557 | int ret = 0; | |
4558 | struct lttng_ht_iter iter; | |
4559 | struct ust_app *app; | |
4560 | ||
4561 | rcu_read_lock(); | |
4562 | ||
852d0037 | 4563 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4466912f DG |
4564 | if (!app->compatible) { |
4565 | /* | |
4566 | * TODO: In time, we should notice the caller of this error by | |
4567 | * telling him that this is a version error. | |
4568 | */ | |
4569 | continue; | |
4570 | } | |
4571 | ||
840cb59c | 4572 | health_code_update(); |
86acf0da | 4573 | |
852d0037 | 4574 | ret = ustctl_calibrate(app->sock, calibrate); |
4466912f DG |
4575 | if (ret < 0) { |
4576 | switch (ret) { | |
4577 | case -ENOSYS: | |
4578 | /* Means that it's not implemented on the tracer side. */ | |
4579 | ret = 0; | |
4580 | break; | |
4581 | default: | |
4466912f | 4582 | DBG2("Calibrate app PID %d returned with error %d", |
852d0037 | 4583 | app->pid, ret); |
4466912f DG |
4584 | break; |
4585 | } | |
4586 | } | |
4587 | } | |
4588 | ||
4589 | DBG("UST app global domain calibration finished"); | |
4590 | ||
4591 | rcu_read_unlock(); | |
4592 | ||
840cb59c | 4593 | health_code_update(); |
86acf0da | 4594 | |
4466912f DG |
4595 | return ret; |
4596 | } | |
d0b96690 DG |
4597 | |
4598 | /* | |
4599 | * Receive registration and populate the given msg structure. | |
4600 | * | |
4601 | * On success return 0 else a negative value returned by the ustctl call. | |
4602 | */ | |
4603 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
4604 | { | |
4605 | int ret; | |
4606 | uint32_t pid, ppid, uid, gid; | |
4607 | ||
4608 | assert(msg); | |
4609 | ||
4610 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
4611 | &pid, &ppid, &uid, &gid, | |
4612 | &msg->bits_per_long, | |
4613 | &msg->uint8_t_alignment, | |
4614 | &msg->uint16_t_alignment, | |
4615 | &msg->uint32_t_alignment, | |
4616 | &msg->uint64_t_alignment, | |
4617 | &msg->long_alignment, | |
4618 | &msg->byte_order, | |
4619 | msg->name); | |
4620 | if (ret < 0) { | |
4621 | switch (-ret) { | |
4622 | case EPIPE: | |
4623 | case ECONNRESET: | |
4624 | case LTTNG_UST_ERR_EXITING: | |
4625 | DBG3("UST app recv reg message failed. Application died"); | |
4626 | break; | |
4627 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
4628 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
4629 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
4630 | LTTNG_UST_ABI_MINOR_VERSION); | |
4631 | break; | |
4632 | default: | |
4633 | ERR("UST app recv reg message failed with ret %d", ret); | |
4634 | break; | |
4635 | } | |
4636 | goto error; | |
4637 | } | |
4638 | msg->pid = (pid_t) pid; | |
4639 | msg->ppid = (pid_t) ppid; | |
4640 | msg->uid = (uid_t) uid; | |
4641 | msg->gid = (gid_t) gid; | |
4642 | ||
4643 | error: | |
4644 | return ret; | |
4645 | } | |
4646 | ||
d88aee68 DG |
4647 | /* |
4648 | * Return a ust app channel object using the application object and the channel | |
4649 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
4650 | * lock MUST be acquired before calling this function. | |
4651 | */ | |
d0b96690 DG |
4652 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
4653 | int objd) | |
4654 | { | |
4655 | struct lttng_ht_node_ulong *node; | |
4656 | struct lttng_ht_iter iter; | |
4657 | struct ust_app_channel *ua_chan = NULL; | |
4658 | ||
4659 | assert(app); | |
4660 | ||
4661 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
4662 | node = lttng_ht_iter_get_node_ulong(&iter); | |
4663 | if (node == NULL) { | |
4664 | DBG2("UST app channel find by objd %d not found", objd); | |
4665 | goto error; | |
4666 | } | |
4667 | ||
4668 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
4669 | ||
4670 | error: | |
4671 | return ua_chan; | |
4672 | } | |
4673 | ||
d88aee68 DG |
4674 | /* |
4675 | * Reply to a register channel notification from an application on the notify | |
4676 | * socket. The channel metadata is also created. | |
4677 | * | |
4678 | * The session UST registry lock is acquired in this function. | |
4679 | * | |
4680 | * On success 0 is returned else a negative value. | |
4681 | */ | |
d0b96690 DG |
4682 | static int reply_ust_register_channel(int sock, int sobjd, int cobjd, |
4683 | size_t nr_fields, struct ustctl_field *fields) | |
4684 | { | |
4685 | int ret, ret_code = 0; | |
4686 | uint32_t chan_id, reg_count; | |
7972aab2 | 4687 | uint64_t chan_reg_key; |
d0b96690 DG |
4688 | enum ustctl_channel_header type; |
4689 | struct ust_app *app; | |
4690 | struct ust_app_channel *ua_chan; | |
4691 | struct ust_app_session *ua_sess; | |
7972aab2 | 4692 | struct ust_registry_session *registry; |
45893984 | 4693 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
4694 | |
4695 | rcu_read_lock(); | |
4696 | ||
4697 | /* Lookup application. If not found, there is a code flow error. */ | |
4698 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4699 | if (!app) { |
4700 | DBG("Application socket %d is being teardown. Abort event notify", | |
4701 | sock); | |
4702 | ret = 0; | |
d5d629b5 | 4703 | free(fields); |
d88aee68 DG |
4704 | goto error_rcu_unlock; |
4705 | } | |
d0b96690 | 4706 | |
4950b860 | 4707 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4708 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4709 | if (!ua_chan) { |
4710 | DBG("Application channel is being teardown. Abort event notify"); | |
4711 | ret = 0; | |
d5d629b5 | 4712 | free(fields); |
4950b860 MD |
4713 | goto error_rcu_unlock; |
4714 | } | |
4715 | ||
d0b96690 DG |
4716 | assert(ua_chan->session); |
4717 | ua_sess = ua_chan->session; | |
d0b96690 | 4718 | |
7972aab2 DG |
4719 | /* Get right session registry depending on the session buffer type. */ |
4720 | registry = get_session_registry(ua_sess); | |
4721 | assert(registry); | |
45893984 | 4722 | |
7972aab2 DG |
4723 | /* Depending on the buffer type, a different channel key is used. */ |
4724 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4725 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 4726 | } else { |
7972aab2 | 4727 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
4728 | } |
4729 | ||
7972aab2 DG |
4730 | pthread_mutex_lock(®istry->lock); |
4731 | ||
4732 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
4733 | assert(chan_reg); | |
4734 | ||
4735 | if (!chan_reg->register_done) { | |
4736 | reg_count = ust_registry_get_event_count(chan_reg); | |
4737 | if (reg_count < 31) { | |
4738 | type = USTCTL_CHANNEL_HEADER_COMPACT; | |
4739 | } else { | |
4740 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
4741 | } | |
4742 | ||
4743 | chan_reg->nr_ctx_fields = nr_fields; | |
4744 | chan_reg->ctx_fields = fields; | |
4745 | chan_reg->header_type = type; | |
d0b96690 | 4746 | } else { |
7972aab2 DG |
4747 | /* Get current already assigned values. */ |
4748 | type = chan_reg->header_type; | |
d5d629b5 DG |
4749 | free(fields); |
4750 | /* Set to NULL so the error path does not do a double free. */ | |
4751 | fields = NULL; | |
d0b96690 | 4752 | } |
7972aab2 DG |
4753 | /* Channel id is set during the object creation. */ |
4754 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
4755 | |
4756 | /* Append to metadata */ | |
7972aab2 DG |
4757 | if (!chan_reg->metadata_dumped) { |
4758 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
4759 | if (ret_code) { |
4760 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
4761 | goto reply; | |
4762 | } | |
4763 | } | |
4764 | ||
4765 | reply: | |
7972aab2 DG |
4766 | DBG3("UST app replying to register channel key %" PRIu64 |
4767 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
4768 | ret_code); | |
d0b96690 DG |
4769 | |
4770 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
4771 | if (ret < 0) { | |
4772 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4773 | ERR("UST app reply channel failed with ret %d", ret); | |
4774 | } else { | |
4775 | DBG3("UST app reply channel failed. Application died"); | |
4776 | } | |
4777 | goto error; | |
4778 | } | |
4779 | ||
7972aab2 DG |
4780 | /* This channel registry registration is completed. */ |
4781 | chan_reg->register_done = 1; | |
4782 | ||
d0b96690 | 4783 | error: |
7972aab2 | 4784 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4785 | error_rcu_unlock: |
d0b96690 | 4786 | rcu_read_unlock(); |
d5d629b5 DG |
4787 | if (ret) { |
4788 | free(fields); | |
4789 | } | |
d0b96690 DG |
4790 | return ret; |
4791 | } | |
4792 | ||
d88aee68 DG |
4793 | /* |
4794 | * Add event to the UST channel registry. When the event is added to the | |
4795 | * registry, the metadata is also created. Once done, this replies to the | |
4796 | * application with the appropriate error code. | |
4797 | * | |
4798 | * The session UST registry lock is acquired in the function. | |
4799 | * | |
4800 | * On success 0 is returned else a negative value. | |
4801 | */ | |
d0b96690 DG |
4802 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
4803 | char *sig, size_t nr_fields, struct ustctl_field *fields, int loglevel, | |
4804 | char *model_emf_uri) | |
4805 | { | |
4806 | int ret, ret_code; | |
4807 | uint32_t event_id = 0; | |
7972aab2 | 4808 | uint64_t chan_reg_key; |
d0b96690 DG |
4809 | struct ust_app *app; |
4810 | struct ust_app_channel *ua_chan; | |
4811 | struct ust_app_session *ua_sess; | |
7972aab2 | 4812 | struct ust_registry_session *registry; |
d0b96690 DG |
4813 | |
4814 | rcu_read_lock(); | |
4815 | ||
4816 | /* Lookup application. If not found, there is a code flow error. */ | |
4817 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4818 | if (!app) { |
4819 | DBG("Application socket %d is being teardown. Abort event notify", | |
4820 | sock); | |
4821 | ret = 0; | |
d5d629b5 DG |
4822 | free(sig); |
4823 | free(fields); | |
4824 | free(model_emf_uri); | |
d88aee68 DG |
4825 | goto error_rcu_unlock; |
4826 | } | |
d0b96690 | 4827 | |
4950b860 | 4828 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4829 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4830 | if (!ua_chan) { |
4831 | DBG("Application channel is being teardown. Abort event notify"); | |
4832 | ret = 0; | |
d5d629b5 DG |
4833 | free(sig); |
4834 | free(fields); | |
4835 | free(model_emf_uri); | |
4950b860 MD |
4836 | goto error_rcu_unlock; |
4837 | } | |
4838 | ||
d0b96690 DG |
4839 | assert(ua_chan->session); |
4840 | ua_sess = ua_chan->session; | |
4841 | ||
7972aab2 DG |
4842 | registry = get_session_registry(ua_sess); |
4843 | assert(registry); | |
4844 | ||
4845 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4846 | chan_reg_key = ua_chan->tracing_channel_id; | |
4847 | } else { | |
4848 | chan_reg_key = ua_chan->key; | |
4849 | } | |
4850 | ||
4851 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 4852 | |
d5d629b5 DG |
4853 | /* |
4854 | * From this point on, this call acquires the ownership of the sig, fields | |
4855 | * and model_emf_uri meaning any free are done inside it if needed. These | |
4856 | * three variables MUST NOT be read/write after this. | |
4857 | */ | |
7972aab2 | 4858 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
45893984 | 4859 | sobjd, cobjd, name, sig, nr_fields, fields, loglevel, |
8494bda5 MD |
4860 | model_emf_uri, ua_sess->buffer_type, &event_id, |
4861 | app); | |
d0b96690 DG |
4862 | |
4863 | /* | |
4864 | * The return value is returned to ustctl so in case of an error, the | |
4865 | * application can be notified. In case of an error, it's important not to | |
4866 | * return a negative error or else the application will get closed. | |
4867 | */ | |
4868 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
4869 | if (ret < 0) { | |
4870 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4871 | ERR("UST app reply event failed with ret %d", ret); | |
4872 | } else { | |
4873 | DBG3("UST app reply event failed. Application died"); | |
4874 | } | |
4875 | /* | |
4876 | * No need to wipe the create event since the application socket will | |
4877 | * get close on error hence cleaning up everything by itself. | |
4878 | */ | |
4879 | goto error; | |
4880 | } | |
4881 | ||
7972aab2 DG |
4882 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
4883 | name, event_id); | |
d88aee68 | 4884 | |
d0b96690 | 4885 | error: |
7972aab2 | 4886 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4887 | error_rcu_unlock: |
d0b96690 DG |
4888 | rcu_read_unlock(); |
4889 | return ret; | |
4890 | } | |
4891 | ||
d88aee68 DG |
4892 | /* |
4893 | * Handle application notification through the given notify socket. | |
4894 | * | |
4895 | * Return 0 on success or else a negative value. | |
4896 | */ | |
d0b96690 DG |
4897 | int ust_app_recv_notify(int sock) |
4898 | { | |
4899 | int ret; | |
4900 | enum ustctl_notify_cmd cmd; | |
4901 | ||
4902 | DBG3("UST app receiving notify from sock %d", sock); | |
4903 | ||
4904 | ret = ustctl_recv_notify(sock, &cmd); | |
4905 | if (ret < 0) { | |
4906 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4907 | ERR("UST app recv notify failed with ret %d", ret); | |
4908 | } else { | |
4909 | DBG3("UST app recv notify failed. Application died"); | |
4910 | } | |
4911 | goto error; | |
4912 | } | |
4913 | ||
4914 | switch (cmd) { | |
4915 | case USTCTL_NOTIFY_CMD_EVENT: | |
4916 | { | |
4917 | int sobjd, cobjd, loglevel; | |
4918 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; | |
4919 | size_t nr_fields; | |
4920 | struct ustctl_field *fields; | |
4921 | ||
4922 | DBG2("UST app ustctl register event received"); | |
4923 | ||
4924 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, &loglevel, | |
4925 | &sig, &nr_fields, &fields, &model_emf_uri); | |
4926 | if (ret < 0) { | |
4927 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4928 | ERR("UST app recv event failed with ret %d", ret); | |
4929 | } else { | |
4930 | DBG3("UST app recv event failed. Application died"); | |
4931 | } | |
4932 | goto error; | |
4933 | } | |
4934 | ||
d5d629b5 DG |
4935 | /* |
4936 | * Add event to the UST registry coming from the notify socket. This | |
4937 | * call will free if needed the sig, fields and model_emf_uri. This | |
4938 | * code path loses the ownsership of these variables and transfer them | |
4939 | * to the this function. | |
4940 | */ | |
d0b96690 DG |
4941 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
4942 | fields, loglevel, model_emf_uri); | |
4943 | if (ret < 0) { | |
4944 | goto error; | |
4945 | } | |
4946 | ||
4947 | break; | |
4948 | } | |
4949 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
4950 | { | |
4951 | int sobjd, cobjd; | |
4952 | size_t nr_fields; | |
4953 | struct ustctl_field *fields; | |
4954 | ||
4955 | DBG2("UST app ustctl register channel received"); | |
4956 | ||
4957 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
4958 | &fields); | |
4959 | if (ret < 0) { | |
4960 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4961 | ERR("UST app recv channel failed with ret %d", ret); | |
4962 | } else { | |
4963 | DBG3("UST app recv channel failed. Application died"); | |
4964 | } | |
4965 | goto error; | |
4966 | } | |
4967 | ||
d5d629b5 DG |
4968 | /* |
4969 | * The fields ownership are transfered to this function call meaning | |
4970 | * that if needed it will be freed. After this, it's invalid to access | |
4971 | * fields or clean it up. | |
4972 | */ | |
d0b96690 DG |
4973 | ret = reply_ust_register_channel(sock, sobjd, cobjd, nr_fields, |
4974 | fields); | |
4975 | if (ret < 0) { | |
4976 | goto error; | |
4977 | } | |
4978 | ||
4979 | break; | |
4980 | } | |
4981 | default: | |
4982 | /* Should NEVER happen. */ | |
4983 | assert(0); | |
4984 | } | |
4985 | ||
4986 | error: | |
4987 | return ret; | |
4988 | } | |
d88aee68 DG |
4989 | |
4990 | /* | |
4991 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
4992 | * corresponding application. On failure, the call_rcu to close the socket is | |
4993 | * executed. If an application is found, it tries to delete it from the notify | |
4994 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
4995 | * | |
4996 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
4997 | * call RCU is not done but the rest of the cleanup is. | |
4998 | */ | |
4999 | void ust_app_notify_sock_unregister(int sock) | |
5000 | { | |
5001 | int err_enomem = 0; | |
5002 | struct lttng_ht_iter iter; | |
5003 | struct ust_app *app; | |
5004 | struct ust_app_notify_sock_obj *obj; | |
5005 | ||
5006 | assert(sock >= 0); | |
5007 | ||
5008 | rcu_read_lock(); | |
5009 | ||
5010 | obj = zmalloc(sizeof(*obj)); | |
5011 | if (!obj) { | |
5012 | /* | |
5013 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
5014 | * procedure but the call_rcu will not be called. In this case, we | |
5015 | * accept the fd leak rather than possibly creating an unsynchronized | |
5016 | * state between threads. | |
5017 | * | |
5018 | * TODO: The notify object should be created once the notify socket is | |
5019 | * registered and stored independantely from the ust app object. The | |
5020 | * tricky part is to synchronize the teardown of the application and | |
5021 | * this notify object. Let's keep that in mind so we can avoid this | |
5022 | * kind of shenanigans with ENOMEM in the teardown path. | |
5023 | */ | |
5024 | err_enomem = 1; | |
5025 | } else { | |
5026 | obj->fd = sock; | |
5027 | } | |
5028 | ||
5029 | DBG("UST app notify socket unregister %d", sock); | |
5030 | ||
5031 | /* | |
5032 | * Lookup application by notify socket. If this fails, this means that the | |
5033 | * hash table delete has already been done by the application | |
5034 | * unregistration process so we can safely close the notify socket in a | |
5035 | * call RCU. | |
5036 | */ | |
5037 | app = find_app_by_notify_sock(sock); | |
5038 | if (!app) { | |
5039 | goto close_socket; | |
5040 | } | |
5041 | ||
5042 | iter.iter.node = &app->notify_sock_n.node; | |
5043 | ||
5044 | /* | |
5045 | * Whatever happens here either we fail or succeed, in both cases we have | |
5046 | * to close the socket after a grace period to continue to the call RCU | |
5047 | * here. If the deletion is successful, the application is not visible | |
5048 | * anymore by other threads and is it fails it means that it was already | |
5049 | * deleted from the hash table so either way we just have to close the | |
5050 | * socket. | |
5051 | */ | |
5052 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
5053 | ||
5054 | close_socket: | |
5055 | rcu_read_unlock(); | |
5056 | ||
5057 | /* | |
5058 | * Close socket after a grace period to avoid for the socket to be reused | |
5059 | * before the application object is freed creating potential race between | |
5060 | * threads trying to add unique in the global hash table. | |
5061 | */ | |
5062 | if (!err_enomem) { | |
5063 | call_rcu(&obj->head, close_notify_sock_rcu); | |
5064 | } | |
5065 | } | |
f45e313d DG |
5066 | |
5067 | /* | |
5068 | * Destroy a ust app data structure and free its memory. | |
5069 | */ | |
5070 | void ust_app_destroy(struct ust_app *app) | |
5071 | { | |
5072 | if (!app) { | |
5073 | return; | |
5074 | } | |
5075 | ||
5076 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
5077 | } | |
6dc3064a DG |
5078 | |
5079 | /* | |
5080 | * Take a snapshot for a given UST session. The snapshot is sent to the given | |
5081 | * output. | |
5082 | * | |
5083 | * Return 0 on success or else a negative value. | |
5084 | */ | |
5085 | int ust_app_snapshot_record(struct ltt_ust_session *usess, | |
68808f4e | 5086 | struct snapshot_output *output, int wait, uint64_t max_stream_size) |
6dc3064a DG |
5087 | { |
5088 | int ret = 0; | |
7badf927 | 5089 | unsigned int snapshot_done = 0; |
6dc3064a DG |
5090 | struct lttng_ht_iter iter; |
5091 | struct ust_app *app; | |
af706bb7 | 5092 | char pathname[PATH_MAX]; |
6dc3064a DG |
5093 | |
5094 | assert(usess); | |
5095 | assert(output); | |
5096 | ||
5097 | rcu_read_lock(); | |
5098 | ||
8c924c7b MD |
5099 | switch (usess->buffer_type) { |
5100 | case LTTNG_BUFFER_PER_UID: | |
5101 | { | |
5102 | struct buffer_reg_uid *reg; | |
6dc3064a | 5103 | |
8c924c7b MD |
5104 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
5105 | struct buffer_reg_channel *reg_chan; | |
5106 | struct consumer_socket *socket; | |
6dc3064a | 5107 | |
8c924c7b MD |
5108 | /* Get consumer socket to use to push the metadata.*/ |
5109 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
5110 | usess->consumer); | |
5111 | if (!socket) { | |
5112 | ret = -EINVAL; | |
5113 | goto error; | |
5114 | } | |
6dc3064a | 5115 | |
8c924c7b MD |
5116 | memset(pathname, 0, sizeof(pathname)); |
5117 | ret = snprintf(pathname, sizeof(pathname), | |
5118 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH, | |
5119 | reg->uid, reg->bits_per_long); | |
5120 | if (ret < 0) { | |
5121 | PERROR("snprintf snapshot path"); | |
5122 | goto error; | |
5123 | } | |
5124 | ||
5125 | /* Add the UST default trace dir to path. */ | |
5126 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
5127 | reg_chan, node.node) { | |
68808f4e DG |
5128 | ret = consumer_snapshot_channel(socket, reg_chan->consumer_key, |
5129 | output, 0, usess->uid, usess->gid, pathname, wait, | |
8c924c7b MD |
5130 | max_stream_size); |
5131 | if (ret < 0) { | |
5132 | goto error; | |
5133 | } | |
5134 | } | |
68808f4e DG |
5135 | ret = consumer_snapshot_channel(socket, |
5136 | reg->registry->reg.ust->metadata_key, output, 1, | |
5137 | usess->uid, usess->gid, pathname, wait, max_stream_size); | |
8c924c7b MD |
5138 | if (ret < 0) { |
5139 | goto error; | |
5140 | } | |
7badf927 | 5141 | snapshot_done = 1; |
af706bb7 | 5142 | } |
8c924c7b MD |
5143 | break; |
5144 | } | |
5145 | case LTTNG_BUFFER_PER_PID: | |
5146 | { | |
5147 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5148 | struct consumer_socket *socket; | |
5149 | struct lttng_ht_iter chan_iter; | |
5150 | struct ust_app_channel *ua_chan; | |
5151 | struct ust_app_session *ua_sess; | |
5152 | struct ust_registry_session *registry; | |
5153 | ||
5154 | ua_sess = lookup_session_by_app(usess, app); | |
5155 | if (!ua_sess) { | |
5156 | /* Session not associated with this app. */ | |
5157 | continue; | |
5158 | } | |
af706bb7 | 5159 | |
8c924c7b MD |
5160 | /* Get the right consumer socket for the application. */ |
5161 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
5162 | output->consumer); | |
5163 | if (!socket) { | |
5c786ded | 5164 | ret = -EINVAL; |
5c786ded JD |
5165 | goto error; |
5166 | } | |
5167 | ||
8c924c7b MD |
5168 | /* Add the UST default trace dir to path. */ |
5169 | memset(pathname, 0, sizeof(pathname)); | |
5170 | ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "/%s", | |
5171 | ua_sess->path); | |
6dc3064a | 5172 | if (ret < 0) { |
8c924c7b | 5173 | PERROR("snprintf snapshot path"); |
6dc3064a DG |
5174 | goto error; |
5175 | } | |
6dc3064a | 5176 | |
8c924c7b MD |
5177 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, |
5178 | ua_chan, node.node) { | |
68808f4e DG |
5179 | ret = consumer_snapshot_channel(socket, ua_chan->key, output, |
5180 | 0, ua_sess->euid, ua_sess->egid, pathname, wait, | |
8c924c7b MD |
5181 | max_stream_size); |
5182 | if (ret < 0) { | |
5183 | goto error; | |
5184 | } | |
5185 | } | |
5186 | ||
5187 | registry = get_session_registry(ua_sess); | |
5188 | assert(registry); | |
5189 | ret = consumer_snapshot_channel(socket, registry->metadata_key, output, | |
5190 | 1, ua_sess->euid, ua_sess->egid, pathname, wait, | |
5191 | max_stream_size); | |
5192 | if (ret < 0) { | |
5193 | goto error; | |
5194 | } | |
7badf927 | 5195 | snapshot_done = 1; |
8c924c7b MD |
5196 | } |
5197 | break; | |
5198 | } | |
5199 | default: | |
5200 | assert(0); | |
5201 | break; | |
6dc3064a DG |
5202 | } |
5203 | ||
7badf927 DG |
5204 | if (!snapshot_done) { |
5205 | /* | |
5206 | * If no snapshot was made and we are not in the error path, this means | |
5207 | * that there are no buffers thus no (prior) application to snapshot | |
5208 | * data from so we have simply NO data. | |
5209 | */ | |
5210 | ret = -ENODATA; | |
5211 | } | |
5212 | ||
6dc3064a DG |
5213 | error: |
5214 | rcu_read_unlock(); | |
5215 | return ret; | |
5216 | } | |
5c786ded JD |
5217 | |
5218 | /* | |
5219 | * Return the number of streams for a UST session. | |
5220 | */ | |
5221 | unsigned int ust_app_get_nb_stream(struct ltt_ust_session *usess) | |
5222 | { | |
5223 | unsigned int ret = 0; | |
5224 | struct ust_app *app; | |
5225 | struct lttng_ht_iter iter; | |
5226 | ||
5227 | assert(usess); | |
5228 | ||
5229 | switch (usess->buffer_type) { | |
5230 | case LTTNG_BUFFER_PER_UID: | |
5231 | { | |
5232 | struct buffer_reg_uid *reg; | |
5233 | ||
5234 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
5235 | struct buffer_reg_channel *reg_chan; | |
5236 | ||
b7064eaa | 5237 | rcu_read_lock(); |
5c786ded JD |
5238 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
5239 | reg_chan, node.node) { | |
5240 | ret += reg_chan->stream_count; | |
5241 | } | |
b7064eaa | 5242 | rcu_read_unlock(); |
5c786ded JD |
5243 | } |
5244 | break; | |
5245 | } | |
5246 | case LTTNG_BUFFER_PER_PID: | |
5247 | { | |
5248 | rcu_read_lock(); | |
5249 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5250 | struct ust_app_channel *ua_chan; | |
5251 | struct ust_app_session *ua_sess; | |
5252 | struct lttng_ht_iter chan_iter; | |
5253 | ||
5254 | ua_sess = lookup_session_by_app(usess, app); | |
5255 | if (!ua_sess) { | |
5256 | /* Session not associated with this app. */ | |
5257 | continue; | |
5258 | } | |
5259 | ||
5260 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
5261 | ua_chan, node.node) { | |
5262 | ret += ua_chan->streams.count; | |
5263 | } | |
5264 | } | |
5265 | rcu_read_unlock(); | |
5266 | break; | |
5267 | } | |
5268 | default: | |
5269 | assert(0); | |
5270 | break; | |
5271 | } | |
5272 | ||
5273 | return ret; | |
5274 | } |