Commit | Line | Data |
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91d76f53 DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * | |
d14d33bf AM |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License, version 2 only, | |
6 | * as published by the Free Software Foundation. | |
91d76f53 DG |
7 | * |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
d14d33bf AM |
13 | * You should have received a copy of the GNU General Public License along |
14 | * with this program; if not, write to the Free Software Foundation, Inc., | |
15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
91d76f53 DG |
16 | */ |
17 | ||
18 | #define _GNU_SOURCE | |
19 | #include <errno.h> | |
7972aab2 | 20 | #include <inttypes.h> |
91d76f53 DG |
21 | #include <pthread.h> |
22 | #include <stdio.h> | |
23 | #include <stdlib.h> | |
099e26bd | 24 | #include <string.h> |
aba8e916 DG |
25 | #include <sys/stat.h> |
26 | #include <sys/types.h> | |
099e26bd | 27 | #include <unistd.h> |
0df502fd | 28 | #include <urcu/compiler.h> |
fb54cdbf | 29 | #include <lttng/ust-error.h> |
331744e3 | 30 | #include <signal.h> |
bec39940 | 31 | |
990570ed | 32 | #include <common/common.h> |
86acf0da | 33 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 34 | |
7972aab2 | 35 | #include "buffer-registry.h" |
86acf0da DG |
36 | #include "fd-limit.h" |
37 | #include "health.h" | |
56fff090 | 38 | #include "ust-app.h" |
48842b30 | 39 | #include "ust-consumer.h" |
d80a6244 | 40 | #include "ust-ctl.h" |
0b2dc8df | 41 | #include "utils.h" |
d80a6244 | 42 | |
77c5447b MD |
43 | /* Next available channel key. Access under next_channel_key_lock. */ |
44 | static uint64_t _next_channel_key; | |
45 | static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER; | |
46 | ||
47 | /* Next available session ID. Access under next_session_id_lock. */ | |
48 | static uint64_t _next_session_id; | |
49 | static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER; | |
ffe60014 DG |
50 | |
51 | /* | |
77c5447b | 52 | * Return the incremented value of next_channel_key. |
ffe60014 | 53 | */ |
77c5447b | 54 | static uint64_t get_next_channel_key(void) |
ffe60014 | 55 | { |
77c5447b MD |
56 | uint64_t ret; |
57 | ||
58 | pthread_mutex_lock(&next_channel_key_lock); | |
59 | ret = ++_next_channel_key; | |
60 | pthread_mutex_unlock(&next_channel_key_lock); | |
61 | return ret; | |
ffe60014 DG |
62 | } |
63 | ||
64 | /* | |
7972aab2 | 65 | * Return the atomically incremented value of next_session_id. |
ffe60014 | 66 | */ |
77c5447b | 67 | static uint64_t get_next_session_id(void) |
ffe60014 | 68 | { |
77c5447b MD |
69 | uint64_t ret; |
70 | ||
71 | pthread_mutex_lock(&next_session_id_lock); | |
72 | ret = ++_next_session_id; | |
73 | pthread_mutex_unlock(&next_session_id_lock); | |
74 | return ret; | |
ffe60014 DG |
75 | } |
76 | ||
d65d2de8 DG |
77 | static void copy_channel_attr_to_ustctl( |
78 | struct ustctl_consumer_channel_attr *attr, | |
79 | struct lttng_ust_channel_attr *uattr) | |
80 | { | |
81 | /* Copy event attributes since the layout is different. */ | |
82 | attr->subbuf_size = uattr->subbuf_size; | |
83 | attr->num_subbuf = uattr->num_subbuf; | |
84 | attr->overwrite = uattr->overwrite; | |
85 | attr->switch_timer_interval = uattr->switch_timer_interval; | |
86 | attr->read_timer_interval = uattr->read_timer_interval; | |
87 | attr->output = uattr->output; | |
88 | } | |
89 | ||
025faf73 DG |
90 | /* |
91 | * Match function for the hash table lookup. | |
92 | * | |
93 | * It matches an ust app event based on three attributes which are the event | |
94 | * name, the filter bytecode and the loglevel. | |
95 | */ | |
18eace3b DG |
96 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
97 | { | |
98 | struct ust_app_event *event; | |
99 | const struct ust_app_ht_key *key; | |
100 | ||
101 | assert(node); | |
102 | assert(_key); | |
103 | ||
104 | event = caa_container_of(node, struct ust_app_event, node.node); | |
105 | key = _key; | |
106 | ||
107 | /* Match the 3 elements of the key: name, filter and loglevel. */ | |
108 | ||
109 | /* Event name */ | |
110 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
111 | goto no_match; | |
112 | } | |
113 | ||
114 | /* Event loglevel. */ | |
115 | if (event->attr.loglevel != key->loglevel) { | |
025faf73 DG |
116 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
117 | && key->loglevel == 0 && event->attr.loglevel == -1) { | |
118 | /* | |
119 | * Match is accepted. This is because on event creation, the | |
120 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
121 | * -1 are accepted for this loglevel type since 0 is the one set by | |
122 | * the API when receiving an enable event. | |
123 | */ | |
124 | } else { | |
125 | goto no_match; | |
126 | } | |
18eace3b DG |
127 | } |
128 | ||
129 | /* One of the filters is NULL, fail. */ | |
130 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
131 | goto no_match; | |
132 | } | |
133 | ||
025faf73 DG |
134 | if (key->filter && event->filter) { |
135 | /* Both filters exists, check length followed by the bytecode. */ | |
136 | if (event->filter->len != key->filter->len || | |
137 | memcmp(event->filter->data, key->filter->data, | |
138 | event->filter->len) != 0) { | |
139 | goto no_match; | |
140 | } | |
18eace3b DG |
141 | } |
142 | ||
025faf73 | 143 | /* Match. */ |
18eace3b DG |
144 | return 1; |
145 | ||
146 | no_match: | |
147 | return 0; | |
18eace3b DG |
148 | } |
149 | ||
025faf73 DG |
150 | /* |
151 | * Unique add of an ust app event in the given ht. This uses the custom | |
152 | * ht_match_ust_app_event match function and the event name as hash. | |
153 | */ | |
d0b96690 | 154 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
155 | struct ust_app_event *event) |
156 | { | |
157 | struct cds_lfht_node *node_ptr; | |
158 | struct ust_app_ht_key key; | |
d0b96690 | 159 | struct lttng_ht *ht; |
18eace3b | 160 | |
d0b96690 DG |
161 | assert(ua_chan); |
162 | assert(ua_chan->events); | |
18eace3b DG |
163 | assert(event); |
164 | ||
d0b96690 | 165 | ht = ua_chan->events; |
18eace3b DG |
166 | key.name = event->attr.name; |
167 | key.filter = event->filter; | |
168 | key.loglevel = event->attr.loglevel; | |
169 | ||
170 | node_ptr = cds_lfht_add_unique(ht->ht, | |
171 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
172 | ht_match_ust_app_event, &key, &event->node.node); | |
173 | assert(node_ptr == &event->node.node); | |
174 | } | |
175 | ||
d88aee68 DG |
176 | /* |
177 | * Close the notify socket from the given RCU head object. This MUST be called | |
178 | * through a call_rcu(). | |
179 | */ | |
180 | static void close_notify_sock_rcu(struct rcu_head *head) | |
181 | { | |
182 | int ret; | |
183 | struct ust_app_notify_sock_obj *obj = | |
184 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
185 | ||
186 | /* Must have a valid fd here. */ | |
187 | assert(obj->fd >= 0); | |
188 | ||
189 | ret = close(obj->fd); | |
190 | if (ret) { | |
191 | ERR("close notify sock %d RCU", obj->fd); | |
192 | } | |
193 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
194 | ||
195 | free(obj); | |
196 | } | |
197 | ||
7972aab2 DG |
198 | /* |
199 | * Return the session registry according to the buffer type of the given | |
200 | * session. | |
201 | * | |
202 | * A registry per UID object MUST exists before calling this function or else | |
203 | * it assert() if not found. RCU read side lock must be acquired. | |
204 | */ | |
205 | static struct ust_registry_session *get_session_registry( | |
206 | struct ust_app_session *ua_sess) | |
207 | { | |
208 | struct ust_registry_session *registry = NULL; | |
209 | ||
210 | assert(ua_sess); | |
211 | ||
212 | switch (ua_sess->buffer_type) { | |
213 | case LTTNG_BUFFER_PER_PID: | |
214 | { | |
215 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
216 | if (!reg_pid) { | |
217 | goto error; | |
218 | } | |
219 | registry = reg_pid->registry->reg.ust; | |
220 | break; | |
221 | } | |
222 | case LTTNG_BUFFER_PER_UID: | |
223 | { | |
224 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
225 | ua_sess->tracing_id, ua_sess->bits_per_long, ua_sess->uid); | |
226 | if (!reg_uid) { | |
227 | goto error; | |
228 | } | |
229 | registry = reg_uid->registry->reg.ust; | |
230 | break; | |
231 | } | |
232 | default: | |
233 | assert(0); | |
234 | }; | |
235 | ||
236 | error: | |
237 | return registry; | |
238 | } | |
239 | ||
55cc08a6 DG |
240 | /* |
241 | * Delete ust context safely. RCU read lock must be held before calling | |
242 | * this function. | |
243 | */ | |
244 | static | |
245 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx) | |
246 | { | |
ffe60014 DG |
247 | int ret; |
248 | ||
249 | assert(ua_ctx); | |
250 | ||
55cc08a6 | 251 | if (ua_ctx->obj) { |
ffe60014 | 252 | ret = ustctl_release_object(sock, ua_ctx->obj); |
d0b96690 DG |
253 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
254 | ERR("UST app sock %d release ctx obj handle %d failed with ret %d", | |
255 | sock, ua_ctx->obj->handle, ret); | |
ffe60014 | 256 | } |
55cc08a6 DG |
257 | free(ua_ctx->obj); |
258 | } | |
259 | free(ua_ctx); | |
260 | } | |
261 | ||
d80a6244 DG |
262 | /* |
263 | * Delete ust app event safely. RCU read lock must be held before calling | |
264 | * this function. | |
265 | */ | |
8b366481 DG |
266 | static |
267 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event) | |
d80a6244 | 268 | { |
ffe60014 DG |
269 | int ret; |
270 | ||
271 | assert(ua_event); | |
272 | ||
53a80697 | 273 | free(ua_event->filter); |
d80a6244 | 274 | |
edb67388 | 275 | if (ua_event->obj != NULL) { |
ffe60014 DG |
276 | ret = ustctl_release_object(sock, ua_event->obj); |
277 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
278 | ERR("UST app sock %d release event obj failed with ret %d", | |
279 | sock, ret); | |
280 | } | |
edb67388 DG |
281 | free(ua_event->obj); |
282 | } | |
d80a6244 DG |
283 | free(ua_event); |
284 | } | |
285 | ||
286 | /* | |
7972aab2 DG |
287 | * Release ust data object of the given stream. |
288 | * | |
289 | * Return 0 on success or else a negative value. | |
d80a6244 | 290 | */ |
7972aab2 | 291 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream) |
d80a6244 | 292 | { |
7972aab2 | 293 | int ret = 0; |
ffe60014 DG |
294 | |
295 | assert(stream); | |
296 | ||
8b366481 | 297 | if (stream->obj) { |
ffe60014 DG |
298 | ret = ustctl_release_object(sock, stream->obj); |
299 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
300 | ERR("UST app sock %d release stream obj failed with ret %d", | |
301 | sock, ret); | |
302 | } | |
4063050c | 303 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
304 | free(stream->obj); |
305 | } | |
7972aab2 DG |
306 | |
307 | return ret; | |
308 | } | |
309 | ||
310 | /* | |
311 | * Delete ust app stream safely. RCU read lock must be held before calling | |
312 | * this function. | |
313 | */ | |
314 | static | |
315 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream) | |
316 | { | |
317 | assert(stream); | |
318 | ||
319 | (void) release_ust_app_stream(sock, stream); | |
84cd17c6 | 320 | free(stream); |
d80a6244 DG |
321 | } |
322 | ||
36b588ed MD |
323 | /* |
324 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
325 | * section and outside of call_rcu thread, so we postpone its execution |
326 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
327 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
328 | */ |
329 | static | |
330 | void delete_ust_app_channel_rcu(struct rcu_head *head) | |
331 | { | |
332 | struct ust_app_channel *ua_chan = | |
333 | caa_container_of(head, struct ust_app_channel, rcu_head); | |
334 | ||
0b2dc8df MD |
335 | ht_cleanup_push(ua_chan->ctx); |
336 | ht_cleanup_push(ua_chan->events); | |
36b588ed MD |
337 | free(ua_chan); |
338 | } | |
339 | ||
d80a6244 DG |
340 | /* |
341 | * Delete ust app channel safely. RCU read lock must be held before calling | |
342 | * this function. | |
343 | */ | |
8b366481 | 344 | static |
d0b96690 DG |
345 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
346 | struct ust_app *app) | |
d80a6244 DG |
347 | { |
348 | int ret; | |
bec39940 | 349 | struct lttng_ht_iter iter; |
d80a6244 | 350 | struct ust_app_event *ua_event; |
55cc08a6 | 351 | struct ust_app_ctx *ua_ctx; |
030a66fa | 352 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 353 | struct ust_registry_session *registry; |
d80a6244 | 354 | |
ffe60014 DG |
355 | assert(ua_chan); |
356 | ||
357 | DBG3("UST app deleting channel %s", ua_chan->name); | |
358 | ||
55cc08a6 | 359 | /* Wipe stream */ |
d80a6244 | 360 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 361 | cds_list_del(&stream->list); |
d80a6244 DG |
362 | delete_ust_app_stream(sock, stream); |
363 | } | |
364 | ||
55cc08a6 | 365 | /* Wipe context */ |
bec39940 DG |
366 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
367 | ret = lttng_ht_del(ua_chan->ctx, &iter); | |
55cc08a6 DG |
368 | assert(!ret); |
369 | delete_ust_app_ctx(sock, ua_ctx); | |
370 | } | |
d80a6244 | 371 | |
55cc08a6 | 372 | /* Wipe events */ |
bec39940 DG |
373 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
374 | node.node) { | |
375 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 376 | assert(!ret); |
d80a6244 DG |
377 | delete_ust_app_event(sock, ua_event); |
378 | } | |
edb67388 | 379 | |
45893984 | 380 | /* Wipe and free registry from session registry. */ |
7972aab2 DG |
381 | registry = get_session_registry(ua_chan->session); |
382 | if (registry) { | |
383 | ust_registry_channel_del_free(registry, ua_chan->key); | |
384 | } | |
d0b96690 | 385 | |
edb67388 | 386 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
387 | /* Remove channel from application UST object descriptor. */ |
388 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
389 | lttng_ht_del(app->ust_objd, &iter); | |
ffe60014 DG |
390 | ret = ustctl_release_object(sock, ua_chan->obj); |
391 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
392 | ERR("UST app sock %d release channel obj failed with ret %d", | |
393 | sock, ret); | |
394 | } | |
7972aab2 | 395 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
396 | free(ua_chan->obj); |
397 | } | |
36b588ed | 398 | call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); |
d80a6244 DG |
399 | } |
400 | ||
331744e3 | 401 | /* |
1b532a60 DG |
402 | * Push metadata to consumer socket. |
403 | * | |
404 | * The socket lock MUST be acquired. | |
405 | * The ust app session lock MUST be acquired. | |
331744e3 JD |
406 | * |
407 | * On success, return the len of metadata pushed or else a negative value. | |
408 | */ | |
409 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
410 | struct consumer_socket *socket, int send_zero_data) | |
411 | { | |
412 | int ret; | |
413 | char *metadata_str = NULL; | |
414 | size_t len, offset; | |
415 | ssize_t ret_val; | |
416 | ||
417 | assert(registry); | |
418 | assert(socket); | |
1b532a60 DG |
419 | |
420 | /* | |
421 | * On a push metadata error either the consumer is dead or the metadata | |
422 | * channel has been destroyed because its endpoint might have died (e.g: | |
423 | * relayd). If so, the metadata closed flag is set to 1 so we deny pushing | |
424 | * metadata again which is not valid anymore on the consumer side. | |
425 | * | |
426 | * The ust app session mutex locked allows us to make this check without | |
427 | * the registry lock. | |
428 | */ | |
429 | if (registry->metadata_closed) { | |
430 | return -EPIPE; | |
431 | } | |
331744e3 JD |
432 | |
433 | pthread_mutex_lock(®istry->lock); | |
434 | ||
435 | offset = registry->metadata_len_sent; | |
436 | len = registry->metadata_len - registry->metadata_len_sent; | |
437 | if (len == 0) { | |
438 | DBG3("No metadata to push for metadata key %" PRIu64, | |
439 | registry->metadata_key); | |
440 | ret_val = len; | |
441 | if (send_zero_data) { | |
442 | DBG("No metadata to push"); | |
443 | goto push_data; | |
444 | } | |
445 | goto end; | |
446 | } | |
447 | ||
448 | /* Allocate only what we have to send. */ | |
449 | metadata_str = zmalloc(len); | |
450 | if (!metadata_str) { | |
451 | PERROR("zmalloc ust app metadata string"); | |
452 | ret_val = -ENOMEM; | |
453 | goto error; | |
454 | } | |
455 | /* Copy what we haven't send out. */ | |
456 | memcpy(metadata_str, registry->metadata + offset, len); | |
457 | registry->metadata_len_sent += len; | |
458 | ||
459 | push_data: | |
460 | pthread_mutex_unlock(®istry->lock); | |
461 | ret = consumer_push_metadata(socket, registry->metadata_key, | |
462 | metadata_str, len, offset); | |
463 | if (ret < 0) { | |
464 | ret_val = ret; | |
465 | goto error_push; | |
466 | } | |
467 | ||
468 | free(metadata_str); | |
469 | return len; | |
470 | ||
471 | end: | |
472 | error: | |
473 | pthread_mutex_unlock(®istry->lock); | |
474 | error_push: | |
475 | free(metadata_str); | |
476 | return ret_val; | |
477 | } | |
478 | ||
d88aee68 DG |
479 | /* |
480 | * For a given application and session, push metadata to consumer. The session | |
481 | * lock MUST be acquired here before calling this. | |
331744e3 JD |
482 | * Either sock or consumer is required : if sock is NULL, the default |
483 | * socket to send the metadata is retrieved from consumer, if sock | |
484 | * is not NULL we use it to send the metadata. | |
d88aee68 DG |
485 | * |
486 | * Return 0 on success else a negative error. | |
487 | */ | |
7972aab2 DG |
488 | static int push_metadata(struct ust_registry_session *registry, |
489 | struct consumer_output *consumer) | |
d88aee68 | 490 | { |
331744e3 JD |
491 | int ret_val; |
492 | ssize_t ret; | |
d88aee68 DG |
493 | struct consumer_socket *socket; |
494 | ||
7972aab2 DG |
495 | assert(registry); |
496 | assert(consumer); | |
497 | ||
498 | rcu_read_lock(); | |
d88aee68 | 499 | |
7972aab2 DG |
500 | /* |
501 | * Means that no metadata was assigned to the session. This can happens if | |
502 | * no start has been done previously. | |
503 | */ | |
504 | if (!registry->metadata_key) { | |
331744e3 | 505 | ret_val = 0; |
1b532a60 | 506 | goto end_rcu_unlock; |
d88aee68 DG |
507 | } |
508 | ||
d88aee68 | 509 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
510 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
511 | consumer); | |
d88aee68 | 512 | if (!socket) { |
331744e3 | 513 | ret_val = -1; |
d88aee68 DG |
514 | goto error_rcu_unlock; |
515 | } | |
516 | ||
517 | /* | |
518 | * TODO: Currently, we hold the socket lock around sampling of the next | |
519 | * metadata segment to ensure we send metadata over the consumer socket in | |
520 | * the correct order. This makes the registry lock nest inside the socket | |
521 | * lock. | |
522 | * | |
523 | * Please note that this is a temporary measure: we should move this lock | |
524 | * back into ust_consumer_push_metadata() when the consumer gets the | |
525 | * ability to reorder the metadata it receives. | |
526 | */ | |
527 | pthread_mutex_lock(socket->lock); | |
331744e3 JD |
528 | ret = ust_app_push_metadata(registry, socket, 0); |
529 | pthread_mutex_unlock(socket->lock); | |
d88aee68 | 530 | if (ret < 0) { |
331744e3 | 531 | ret_val = ret; |
d88aee68 DG |
532 | goto error_rcu_unlock; |
533 | } | |
534 | ||
d88aee68 | 535 | rcu_read_unlock(); |
d88aee68 DG |
536 | return 0; |
537 | ||
d88aee68 | 538 | error_rcu_unlock: |
1b532a60 DG |
539 | /* |
540 | * On error, flag the registry that the metadata is closed. We were unable | |
541 | * to push anything and this means that either the consumer is not | |
542 | * responding or the metadata cache has been destroyed on the consumer. | |
543 | */ | |
544 | registry->metadata_closed = 1; | |
545 | end_rcu_unlock: | |
d88aee68 | 546 | rcu_read_unlock(); |
331744e3 | 547 | return ret_val; |
d88aee68 DG |
548 | } |
549 | ||
550 | /* | |
551 | * Send to the consumer a close metadata command for the given session. Once | |
552 | * done, the metadata channel is deleted and the session metadata pointer is | |
553 | * nullified. The session lock MUST be acquired here unless the application is | |
554 | * in the destroy path. | |
555 | * | |
556 | * Return 0 on success else a negative value. | |
557 | */ | |
7972aab2 DG |
558 | static int close_metadata(struct ust_registry_session *registry, |
559 | struct consumer_output *consumer) | |
d88aee68 DG |
560 | { |
561 | int ret; | |
562 | struct consumer_socket *socket; | |
563 | ||
7972aab2 DG |
564 | assert(registry); |
565 | assert(consumer); | |
d88aee68 | 566 | |
7972aab2 DG |
567 | rcu_read_lock(); |
568 | ||
569 | if (!registry->metadata_key || registry->metadata_closed) { | |
d88aee68 | 570 | ret = 0; |
1b532a60 | 571 | goto end; |
d88aee68 DG |
572 | } |
573 | ||
d88aee68 | 574 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
575 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
576 | consumer); | |
d88aee68 DG |
577 | if (!socket) { |
578 | ret = -1; | |
7972aab2 | 579 | goto error; |
d88aee68 DG |
580 | } |
581 | ||
7972aab2 | 582 | ret = consumer_close_metadata(socket, registry->metadata_key); |
d88aee68 | 583 | if (ret < 0) { |
7972aab2 | 584 | goto error; |
d88aee68 DG |
585 | } |
586 | ||
d88aee68 | 587 | error: |
1b532a60 DG |
588 | /* |
589 | * Metadata closed. Even on error this means that the consumer is not | |
590 | * responding or not found so either way a second close should NOT be emit | |
591 | * for this registry. | |
592 | */ | |
593 | registry->metadata_closed = 1; | |
594 | end: | |
7972aab2 | 595 | rcu_read_unlock(); |
d88aee68 DG |
596 | return ret; |
597 | } | |
598 | ||
36b588ed MD |
599 | /* |
600 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
601 | * section and outside of call_rcu thread, so we postpone its execution |
602 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
603 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
604 | */ |
605 | static | |
606 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
607 | { | |
608 | struct ust_app_session *ua_sess = | |
609 | caa_container_of(head, struct ust_app_session, rcu_head); | |
610 | ||
0b2dc8df | 611 | ht_cleanup_push(ua_sess->channels); |
36b588ed MD |
612 | free(ua_sess); |
613 | } | |
614 | ||
d80a6244 DG |
615 | /* |
616 | * Delete ust app session safely. RCU read lock must be held before calling | |
617 | * this function. | |
618 | */ | |
8b366481 | 619 | static |
d0b96690 DG |
620 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
621 | struct ust_app *app) | |
d80a6244 DG |
622 | { |
623 | int ret; | |
bec39940 | 624 | struct lttng_ht_iter iter; |
d80a6244 | 625 | struct ust_app_channel *ua_chan; |
7972aab2 | 626 | struct ust_registry_session *registry; |
d80a6244 | 627 | |
d88aee68 DG |
628 | assert(ua_sess); |
629 | ||
1b532a60 DG |
630 | pthread_mutex_lock(&ua_sess->lock); |
631 | ||
7972aab2 | 632 | registry = get_session_registry(ua_sess); |
1b532a60 | 633 | if (registry && !registry->metadata_closed) { |
d88aee68 | 634 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 635 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 636 | |
7972aab2 DG |
637 | /* |
638 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
639 | * metadata only on destroy trace session in this case. Also, the |
640 | * previous push metadata could have flag the metadata registry to | |
641 | * close so don't send a close command if closed. | |
7972aab2 | 642 | */ |
1b532a60 DG |
643 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID && |
644 | !registry->metadata_closed) { | |
7972aab2 DG |
645 | /* And ask to close it for this session registry. */ |
646 | (void) close_metadata(registry, ua_sess->consumer); | |
647 | } | |
d80a6244 DG |
648 | } |
649 | ||
bec39940 DG |
650 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
651 | node.node) { | |
652 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 653 | assert(!ret); |
d0b96690 | 654 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 655 | } |
d80a6244 | 656 | |
7972aab2 DG |
657 | /* In case of per PID, the registry is kept in the session. */ |
658 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
659 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
660 | if (reg_pid) { | |
661 | buffer_reg_pid_remove(reg_pid); | |
662 | buffer_reg_pid_destroy(reg_pid); | |
663 | } | |
664 | } | |
d0b96690 | 665 | |
aee6bafd | 666 | if (ua_sess->handle != -1) { |
ffe60014 DG |
667 | ret = ustctl_release_handle(sock, ua_sess->handle); |
668 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
669 | ERR("UST app sock %d release session handle failed with ret %d", | |
670 | sock, ret); | |
671 | } | |
aee6bafd | 672 | } |
1b532a60 DG |
673 | pthread_mutex_unlock(&ua_sess->lock); |
674 | ||
36b588ed | 675 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 676 | } |
91d76f53 DG |
677 | |
678 | /* | |
284d8f55 DG |
679 | * Delete a traceable application structure from the global list. Never call |
680 | * this function outside of a call_rcu call. | |
36b588ed MD |
681 | * |
682 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 683 | */ |
8b366481 DG |
684 | static |
685 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 686 | { |
8b366481 | 687 | int ret, sock; |
d42f20df | 688 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 689 | |
d80a6244 | 690 | /* Delete ust app sessions info */ |
852d0037 DG |
691 | sock = app->sock; |
692 | app->sock = -1; | |
d80a6244 | 693 | |
8b366481 | 694 | /* Wipe sessions */ |
d42f20df DG |
695 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
696 | teardown_node) { | |
697 | /* Free every object in the session and the session. */ | |
36b588ed | 698 | rcu_read_lock(); |
d0b96690 | 699 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 700 | rcu_read_unlock(); |
d80a6244 | 701 | } |
36b588ed | 702 | |
0b2dc8df MD |
703 | ht_cleanup_push(app->sessions); |
704 | ht_cleanup_push(app->ust_objd); | |
d80a6244 | 705 | |
6414a713 | 706 | /* |
852d0037 DG |
707 | * Wait until we have deleted the application from the sock hash table |
708 | * before closing this socket, otherwise an application could re-use the | |
709 | * socket ID and race with the teardown, using the same hash table entry. | |
710 | * | |
711 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
712 | * all RCU readers that could run concurrently with unregister app, | |
713 | * therefore we _need_ to only close that socket after a grace period. So | |
714 | * it should stay in this RCU callback. | |
715 | * | |
716 | * This close() is a very important step of the synchronization model so | |
717 | * every modification to this function must be carefully reviewed. | |
6414a713 | 718 | */ |
799e2c4f MD |
719 | ret = close(sock); |
720 | if (ret) { | |
721 | PERROR("close"); | |
722 | } | |
4063050c | 723 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 724 | |
852d0037 | 725 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 726 | free(app); |
099e26bd DG |
727 | } |
728 | ||
729 | /* | |
f6a9efaa | 730 | * URCU intermediate call to delete an UST app. |
099e26bd | 731 | */ |
8b366481 DG |
732 | static |
733 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 734 | { |
bec39940 DG |
735 | struct lttng_ht_node_ulong *node = |
736 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 737 | struct ust_app *app = |
852d0037 | 738 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 739 | |
852d0037 | 740 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 741 | delete_ust_app(app); |
099e26bd DG |
742 | } |
743 | ||
ffe60014 DG |
744 | /* |
745 | * Delete the session from the application ht and delete the data structure by | |
746 | * freeing every object inside and releasing them. | |
747 | */ | |
d0b96690 | 748 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
749 | struct ust_app_session *ua_sess) |
750 | { | |
751 | int ret; | |
752 | struct lttng_ht_iter iter; | |
753 | ||
754 | assert(app); | |
755 | assert(ua_sess); | |
756 | ||
757 | iter.iter.node = &ua_sess->node.node; | |
758 | ret = lttng_ht_del(app->sessions, &iter); | |
759 | if (ret) { | |
760 | /* Already scheduled for teardown. */ | |
761 | goto end; | |
762 | } | |
763 | ||
764 | /* Once deleted, free the data structure. */ | |
d0b96690 | 765 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
766 | |
767 | end: | |
768 | return; | |
769 | } | |
770 | ||
8b366481 DG |
771 | /* |
772 | * Alloc new UST app session. | |
773 | */ | |
774 | static | |
d0b96690 | 775 | struct ust_app_session *alloc_ust_app_session(struct ust_app *app) |
8b366481 DG |
776 | { |
777 | struct ust_app_session *ua_sess; | |
778 | ||
779 | /* Init most of the default value by allocating and zeroing */ | |
780 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
781 | if (ua_sess == NULL) { | |
782 | PERROR("malloc"); | |
ffe60014 | 783 | goto error_free; |
8b366481 DG |
784 | } |
785 | ||
786 | ua_sess->handle = -1; | |
bec39940 | 787 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
d0b96690 | 788 | pthread_mutex_init(&ua_sess->lock, NULL); |
ffe60014 | 789 | |
8b366481 DG |
790 | return ua_sess; |
791 | ||
ffe60014 | 792 | error_free: |
8b366481 DG |
793 | return NULL; |
794 | } | |
795 | ||
796 | /* | |
797 | * Alloc new UST app channel. | |
798 | */ | |
799 | static | |
800 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 801 | struct ust_app_session *ua_sess, |
ffe60014 | 802 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
803 | { |
804 | struct ust_app_channel *ua_chan; | |
805 | ||
806 | /* Init most of the default value by allocating and zeroing */ | |
807 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
808 | if (ua_chan == NULL) { | |
809 | PERROR("malloc"); | |
810 | goto error; | |
811 | } | |
812 | ||
813 | /* Setup channel name */ | |
814 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
815 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
816 | ||
817 | ua_chan->enabled = 1; | |
818 | ua_chan->handle = -1; | |
45893984 | 819 | ua_chan->session = ua_sess; |
ffe60014 | 820 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
821 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
822 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
823 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
824 | |
825 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
826 | ||
827 | /* Copy attributes */ | |
828 | if (attr) { | |
ffe60014 | 829 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
830 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
831 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
832 | ua_chan->attr.overwrite = attr->overwrite; | |
833 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
834 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
835 | ua_chan->attr.output = attr->output; | |
8b366481 | 836 | } |
ffe60014 DG |
837 | /* By default, the channel is a per cpu channel. */ |
838 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
839 | |
840 | DBG3("UST app channel %s allocated", ua_chan->name); | |
841 | ||
842 | return ua_chan; | |
843 | ||
844 | error: | |
845 | return NULL; | |
846 | } | |
847 | ||
37f1c236 DG |
848 | /* |
849 | * Allocate and initialize a UST app stream. | |
850 | * | |
851 | * Return newly allocated stream pointer or NULL on error. | |
852 | */ | |
ffe60014 | 853 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
854 | { |
855 | struct ust_app_stream *stream = NULL; | |
856 | ||
857 | stream = zmalloc(sizeof(*stream)); | |
858 | if (stream == NULL) { | |
859 | PERROR("zmalloc ust app stream"); | |
860 | goto error; | |
861 | } | |
862 | ||
863 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
864 | stream->handle = -1; | |
865 | ||
866 | error: | |
867 | return stream; | |
868 | } | |
869 | ||
8b366481 DG |
870 | /* |
871 | * Alloc new UST app event. | |
872 | */ | |
873 | static | |
874 | struct ust_app_event *alloc_ust_app_event(char *name, | |
875 | struct lttng_ust_event *attr) | |
876 | { | |
877 | struct ust_app_event *ua_event; | |
878 | ||
879 | /* Init most of the default value by allocating and zeroing */ | |
880 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
881 | if (ua_event == NULL) { | |
882 | PERROR("malloc"); | |
883 | goto error; | |
884 | } | |
885 | ||
886 | ua_event->enabled = 1; | |
887 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
888 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 889 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
890 | |
891 | /* Copy attributes */ | |
892 | if (attr) { | |
893 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
894 | } | |
895 | ||
896 | DBG3("UST app event %s allocated", ua_event->name); | |
897 | ||
898 | return ua_event; | |
899 | ||
900 | error: | |
901 | return NULL; | |
902 | } | |
903 | ||
904 | /* | |
905 | * Alloc new UST app context. | |
906 | */ | |
907 | static | |
908 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx) | |
909 | { | |
910 | struct ust_app_ctx *ua_ctx; | |
911 | ||
912 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
913 | if (ua_ctx == NULL) { | |
914 | goto error; | |
915 | } | |
916 | ||
917 | if (uctx) { | |
918 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
919 | } | |
920 | ||
921 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
922 | ||
923 | error: | |
924 | return ua_ctx; | |
925 | } | |
926 | ||
025faf73 DG |
927 | /* |
928 | * Allocate a filter and copy the given original filter. | |
929 | * | |
930 | * Return allocated filter or NULL on error. | |
931 | */ | |
932 | static struct lttng_ust_filter_bytecode *alloc_copy_ust_app_filter( | |
933 | struct lttng_ust_filter_bytecode *orig_f) | |
934 | { | |
935 | struct lttng_ust_filter_bytecode *filter = NULL; | |
936 | ||
937 | /* Copy filter bytecode */ | |
938 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
939 | if (!filter) { | |
940 | PERROR("zmalloc alloc ust app filter"); | |
941 | goto error; | |
942 | } | |
943 | ||
944 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
945 | ||
946 | error: | |
947 | return filter; | |
948 | } | |
949 | ||
099e26bd | 950 | /* |
421cb601 DG |
951 | * Find an ust_app using the sock and return it. RCU read side lock must be |
952 | * held before calling this helper function. | |
099e26bd | 953 | */ |
8b366481 DG |
954 | static |
955 | struct ust_app *find_app_by_sock(int sock) | |
099e26bd | 956 | { |
bec39940 | 957 | struct lttng_ht_node_ulong *node; |
bec39940 | 958 | struct lttng_ht_iter iter; |
f6a9efaa | 959 | |
852d0037 | 960 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 961 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
962 | if (node == NULL) { |
963 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
964 | goto error; |
965 | } | |
852d0037 DG |
966 | |
967 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
968 | |
969 | error: | |
970 | return NULL; | |
099e26bd DG |
971 | } |
972 | ||
d0b96690 DG |
973 | /* |
974 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
975 | * be held before calling this helper function. | |
976 | */ | |
977 | static struct ust_app *find_app_by_notify_sock(int sock) | |
978 | { | |
979 | struct lttng_ht_node_ulong *node; | |
980 | struct lttng_ht_iter iter; | |
981 | ||
982 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
983 | &iter); | |
984 | node = lttng_ht_iter_get_node_ulong(&iter); | |
985 | if (node == NULL) { | |
986 | DBG2("UST app find by notify sock %d not found", sock); | |
987 | goto error; | |
988 | } | |
989 | ||
990 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
991 | ||
992 | error: | |
993 | return NULL; | |
994 | } | |
995 | ||
025faf73 DG |
996 | /* |
997 | * Lookup for an ust app event based on event name, filter bytecode and the | |
998 | * event loglevel. | |
999 | * | |
1000 | * Return an ust_app_event object or NULL on error. | |
1001 | */ | |
18eace3b DG |
1002 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
1003 | char *name, struct lttng_ust_filter_bytecode *filter, int loglevel) | |
1004 | { | |
1005 | struct lttng_ht_iter iter; | |
1006 | struct lttng_ht_node_str *node; | |
1007 | struct ust_app_event *event = NULL; | |
1008 | struct ust_app_ht_key key; | |
18eace3b DG |
1009 | |
1010 | assert(name); | |
1011 | assert(ht); | |
1012 | ||
1013 | /* Setup key for event lookup. */ | |
1014 | key.name = name; | |
1015 | key.filter = filter; | |
1016 | key.loglevel = loglevel; | |
1017 | ||
025faf73 DG |
1018 | /* Lookup using the event name as hash and a custom match fct. */ |
1019 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1020 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1021 | node = lttng_ht_iter_get_node_str(&iter); |
1022 | if (node == NULL) { | |
1023 | goto end; | |
1024 | } | |
1025 | ||
1026 | event = caa_container_of(node, struct ust_app_event, node); | |
1027 | ||
1028 | end: | |
18eace3b DG |
1029 | return event; |
1030 | } | |
1031 | ||
55cc08a6 DG |
1032 | /* |
1033 | * Create the channel context on the tracer. | |
d0b96690 DG |
1034 | * |
1035 | * Called with UST app session lock held. | |
55cc08a6 DG |
1036 | */ |
1037 | static | |
1038 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1039 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1040 | { | |
1041 | int ret; | |
1042 | ||
840cb59c | 1043 | health_code_update(); |
86acf0da | 1044 | |
852d0037 | 1045 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 DG |
1046 | ua_chan->obj, &ua_ctx->obj); |
1047 | if (ret < 0) { | |
ffe60014 DG |
1048 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1049 | ERR("UST app create channel context failed for app (pid: %d) " | |
1050 | "with ret %d", app->pid, ret); | |
1051 | } else { | |
1052 | DBG3("UST app disable event failed. Application is dead."); | |
1053 | } | |
55cc08a6 DG |
1054 | goto error; |
1055 | } | |
1056 | ||
1057 | ua_ctx->handle = ua_ctx->obj->handle; | |
1058 | ||
d0b96690 DG |
1059 | DBG2("UST app context handle %d created successfully for channel %s", |
1060 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1061 | |
1062 | error: | |
840cb59c | 1063 | health_code_update(); |
55cc08a6 DG |
1064 | return ret; |
1065 | } | |
1066 | ||
53a80697 MD |
1067 | /* |
1068 | * Set the filter on the tracer. | |
1069 | */ | |
1070 | static | |
1071 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
1072 | struct ust_app *app) | |
1073 | { | |
1074 | int ret; | |
1075 | ||
840cb59c | 1076 | health_code_update(); |
86acf0da | 1077 | |
53a80697 | 1078 | if (!ua_event->filter) { |
86acf0da DG |
1079 | ret = 0; |
1080 | goto error; | |
53a80697 MD |
1081 | } |
1082 | ||
1083 | ret = ustctl_set_filter(app->sock, ua_event->filter, | |
1084 | ua_event->obj); | |
1085 | if (ret < 0) { | |
ffe60014 DG |
1086 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1087 | ERR("UST app event %s filter failed for app (pid: %d) " | |
1088 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1089 | } else { | |
1090 | DBG3("UST app filter event failed. Application is dead."); | |
1091 | } | |
53a80697 MD |
1092 | goto error; |
1093 | } | |
1094 | ||
1095 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
1096 | ||
1097 | error: | |
840cb59c | 1098 | health_code_update(); |
53a80697 MD |
1099 | return ret; |
1100 | } | |
1101 | ||
9730260e DG |
1102 | /* |
1103 | * Disable the specified event on to UST tracer for the UST session. | |
1104 | */ | |
1105 | static int disable_ust_event(struct ust_app *app, | |
1106 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1107 | { | |
1108 | int ret; | |
1109 | ||
840cb59c | 1110 | health_code_update(); |
86acf0da | 1111 | |
852d0037 | 1112 | ret = ustctl_disable(app->sock, ua_event->obj); |
9730260e | 1113 | if (ret < 0) { |
ffe60014 DG |
1114 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1115 | ERR("UST app event %s disable failed for app (pid: %d) " | |
1116 | "and session handle %d with ret %d", | |
1117 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1118 | } else { | |
1119 | DBG3("UST app disable event failed. Application is dead."); | |
1120 | } | |
9730260e DG |
1121 | goto error; |
1122 | } | |
1123 | ||
1124 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 1125 | ua_event->attr.name, app->pid); |
9730260e DG |
1126 | |
1127 | error: | |
840cb59c | 1128 | health_code_update(); |
9730260e DG |
1129 | return ret; |
1130 | } | |
1131 | ||
78f0bacd DG |
1132 | /* |
1133 | * Disable the specified channel on to UST tracer for the UST session. | |
1134 | */ | |
1135 | static int disable_ust_channel(struct ust_app *app, | |
1136 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1137 | { | |
1138 | int ret; | |
1139 | ||
840cb59c | 1140 | health_code_update(); |
86acf0da | 1141 | |
852d0037 | 1142 | ret = ustctl_disable(app->sock, ua_chan->obj); |
78f0bacd | 1143 | if (ret < 0) { |
ffe60014 DG |
1144 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1145 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1146 | "and session handle %d with ret %d", | |
1147 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1148 | } else { | |
1149 | DBG3("UST app disable channel failed. Application is dead."); | |
1150 | } | |
78f0bacd DG |
1151 | goto error; |
1152 | } | |
1153 | ||
78f0bacd | 1154 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1155 | ua_chan->name, app->pid); |
78f0bacd DG |
1156 | |
1157 | error: | |
840cb59c | 1158 | health_code_update(); |
78f0bacd DG |
1159 | return ret; |
1160 | } | |
1161 | ||
1162 | /* | |
1163 | * Enable the specified channel on to UST tracer for the UST session. | |
1164 | */ | |
1165 | static int enable_ust_channel(struct ust_app *app, | |
1166 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1167 | { | |
1168 | int ret; | |
1169 | ||
840cb59c | 1170 | health_code_update(); |
86acf0da | 1171 | |
852d0037 | 1172 | ret = ustctl_enable(app->sock, ua_chan->obj); |
78f0bacd | 1173 | if (ret < 0) { |
ffe60014 DG |
1174 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1175 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1176 | "and session handle %d with ret %d", | |
1177 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1178 | } else { | |
1179 | DBG3("UST app enable channel failed. Application is dead."); | |
1180 | } | |
78f0bacd DG |
1181 | goto error; |
1182 | } | |
1183 | ||
1184 | ua_chan->enabled = 1; | |
1185 | ||
1186 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1187 | ua_chan->name, app->pid); |
78f0bacd DG |
1188 | |
1189 | error: | |
840cb59c | 1190 | health_code_update(); |
78f0bacd DG |
1191 | return ret; |
1192 | } | |
1193 | ||
edb67388 DG |
1194 | /* |
1195 | * Enable the specified event on to UST tracer for the UST session. | |
1196 | */ | |
1197 | static int enable_ust_event(struct ust_app *app, | |
1198 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1199 | { | |
1200 | int ret; | |
1201 | ||
840cb59c | 1202 | health_code_update(); |
86acf0da | 1203 | |
852d0037 | 1204 | ret = ustctl_enable(app->sock, ua_event->obj); |
edb67388 | 1205 | if (ret < 0) { |
ffe60014 DG |
1206 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1207 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1208 | "and session handle %d with ret %d", | |
1209 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1210 | } else { | |
1211 | DBG3("UST app enable event failed. Application is dead."); | |
1212 | } | |
edb67388 DG |
1213 | goto error; |
1214 | } | |
1215 | ||
1216 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1217 | ua_event->attr.name, app->pid); |
edb67388 DG |
1218 | |
1219 | error: | |
840cb59c | 1220 | health_code_update(); |
edb67388 DG |
1221 | return ret; |
1222 | } | |
1223 | ||
099e26bd | 1224 | /* |
7972aab2 | 1225 | * Send channel and stream buffer to application. |
4f3ab6ee | 1226 | * |
ffe60014 | 1227 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1228 | */ |
7972aab2 DG |
1229 | static int send_channel_pid_to_ust(struct ust_app *app, |
1230 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1231 | { |
1232 | int ret; | |
ffe60014 | 1233 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1234 | |
1235 | assert(app); | |
ffe60014 | 1236 | assert(ua_sess); |
4f3ab6ee | 1237 | assert(ua_chan); |
4f3ab6ee | 1238 | |
840cb59c | 1239 | health_code_update(); |
4f3ab6ee | 1240 | |
7972aab2 DG |
1241 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1242 | app->sock); | |
86acf0da | 1243 | |
ffe60014 DG |
1244 | /* Send channel to the application. */ |
1245 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
5b4a0ec0 | 1246 | if (ret < 0) { |
b551a063 DG |
1247 | goto error; |
1248 | } | |
1249 | ||
d88aee68 DG |
1250 | health_code_update(); |
1251 | ||
ffe60014 DG |
1252 | /* Send all streams to application. */ |
1253 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1254 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
1255 | if (ret < 0) { | |
1256 | goto error; | |
1257 | } | |
1258 | /* We don't need the stream anymore once sent to the tracer. */ | |
1259 | cds_list_del(&stream->list); | |
1260 | delete_ust_app_stream(-1, stream); | |
1261 | } | |
ffe60014 DG |
1262 | /* Flag the channel that it is sent to the application. */ |
1263 | ua_chan->is_sent = 1; | |
ffe60014 | 1264 | |
b551a063 | 1265 | error: |
840cb59c | 1266 | health_code_update(); |
b551a063 DG |
1267 | return ret; |
1268 | } | |
1269 | ||
91d76f53 | 1270 | /* |
5b4a0ec0 | 1271 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1272 | * |
1273 | * Should be called with session mutex held. | |
91d76f53 | 1274 | */ |
edb67388 DG |
1275 | static |
1276 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1277 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1278 | { |
5b4a0ec0 | 1279 | int ret = 0; |
284d8f55 | 1280 | |
840cb59c | 1281 | health_code_update(); |
86acf0da | 1282 | |
5b4a0ec0 | 1283 | /* Create UST event on tracer */ |
852d0037 | 1284 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 DG |
1285 | &ua_event->obj); |
1286 | if (ret < 0) { | |
ffe60014 DG |
1287 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1288 | ERR("Error ustctl create event %s for app pid: %d with ret %d", | |
1289 | ua_event->attr.name, app->pid, ret); | |
1290 | } else { | |
1291 | DBG3("UST app create event failed. Application is dead."); | |
1292 | } | |
5b4a0ec0 | 1293 | goto error; |
91d76f53 | 1294 | } |
f6a9efaa | 1295 | |
5b4a0ec0 | 1296 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1297 | |
5b4a0ec0 | 1298 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1299 | ua_event->attr.name, app->pid); |
f6a9efaa | 1300 | |
840cb59c | 1301 | health_code_update(); |
86acf0da | 1302 | |
025faf73 DG |
1303 | /* Set filter if one is present. */ |
1304 | if (ua_event->filter) { | |
1305 | ret = set_ust_event_filter(ua_event, app); | |
1306 | if (ret < 0) { | |
1307 | goto error; | |
1308 | } | |
1309 | } | |
1310 | ||
8535a6d9 | 1311 | /* If event not enabled, disable it on the tracer */ |
fc34caaa | 1312 | if (ua_event->enabled == 0) { |
8535a6d9 DG |
1313 | ret = disable_ust_event(app, ua_sess, ua_event); |
1314 | if (ret < 0) { | |
fc34caaa DG |
1315 | /* |
1316 | * If we hit an EPERM, something is wrong with our disable call. If | |
1317 | * we get an EEXIST, there is a problem on the tracer side since we | |
1318 | * just created it. | |
1319 | */ | |
1320 | switch (ret) { | |
49c336c1 | 1321 | case -LTTNG_UST_ERR_PERM: |
fc34caaa DG |
1322 | /* Code flow problem */ |
1323 | assert(0); | |
49c336c1 | 1324 | case -LTTNG_UST_ERR_EXIST: |
fc34caaa DG |
1325 | /* It's OK for our use case. */ |
1326 | ret = 0; | |
1327 | break; | |
1328 | default: | |
1329 | break; | |
1330 | } | |
8535a6d9 DG |
1331 | goto error; |
1332 | } | |
1333 | } | |
1334 | ||
5b4a0ec0 | 1335 | error: |
840cb59c | 1336 | health_code_update(); |
5b4a0ec0 | 1337 | return ret; |
91d76f53 | 1338 | } |
48842b30 | 1339 | |
5b4a0ec0 DG |
1340 | /* |
1341 | * Copy data between an UST app event and a LTT event. | |
1342 | */ | |
421cb601 | 1343 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1344 | struct ltt_ust_event *uevent) |
1345 | { | |
1346 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); | |
1347 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1348 | ||
fc34caaa DG |
1349 | ua_event->enabled = uevent->enabled; |
1350 | ||
5b4a0ec0 DG |
1351 | /* Copy event attributes */ |
1352 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1353 | ||
53a80697 MD |
1354 | /* Copy filter bytecode */ |
1355 | if (uevent->filter) { | |
025faf73 DG |
1356 | ua_event->filter = alloc_copy_ust_app_filter(uevent->filter); |
1357 | /* Filter might be NULL here in case of ENONEM. */ | |
53a80697 | 1358 | } |
48842b30 DG |
1359 | } |
1360 | ||
5b4a0ec0 DG |
1361 | /* |
1362 | * Copy data between an UST app channel and a LTT channel. | |
1363 | */ | |
421cb601 | 1364 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1365 | struct ltt_ust_channel *uchan) |
1366 | { | |
bec39940 | 1367 | struct lttng_ht_iter iter; |
48842b30 | 1368 | struct ltt_ust_event *uevent; |
55cc08a6 | 1369 | struct ltt_ust_context *uctx; |
48842b30 | 1370 | struct ust_app_event *ua_event; |
55cc08a6 | 1371 | struct ust_app_ctx *ua_ctx; |
48842b30 | 1372 | |
fc34caaa | 1373 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1374 | |
1375 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1376 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 1377 | |
1624d5b7 JD |
1378 | ua_chan->tracefile_size = uchan->tracefile_size; |
1379 | ua_chan->tracefile_count = uchan->tracefile_count; | |
1380 | ||
ffe60014 DG |
1381 | /* Copy event attributes since the layout is different. */ |
1382 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1383 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1384 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1385 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1386 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
1387 | ua_chan->attr.output = uchan->attr.output; | |
1388 | /* | |
1389 | * Note that the attribute channel type is not set since the channel on the | |
1390 | * tracing registry side does not have this information. | |
1391 | */ | |
48842b30 | 1392 | |
fc34caaa | 1393 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1394 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1395 | |
bec39940 | 1396 | cds_lfht_for_each_entry(uchan->ctx->ht, &iter.iter, uctx, node.node) { |
55cc08a6 DG |
1397 | ua_ctx = alloc_ust_app_ctx(&uctx->ctx); |
1398 | if (ua_ctx == NULL) { | |
1399 | continue; | |
1400 | } | |
bec39940 DG |
1401 | lttng_ht_node_init_ulong(&ua_ctx->node, |
1402 | (unsigned long) ua_ctx->ctx.ctx); | |
1403 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
55cc08a6 | 1404 | } |
48842b30 | 1405 | |
421cb601 | 1406 | /* Copy all events from ltt ust channel to ust app channel */ |
bec39940 | 1407 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
18eace3b DG |
1408 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
1409 | uevent->filter, uevent->attr.loglevel); | |
1410 | if (ua_event == NULL) { | |
421cb601 | 1411 | DBG2("UST event %s not found on shadow copy channel", |
48842b30 | 1412 | uevent->attr.name); |
284d8f55 | 1413 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
48842b30 | 1414 | if (ua_event == NULL) { |
5b4a0ec0 | 1415 | continue; |
48842b30 | 1416 | } |
421cb601 | 1417 | shadow_copy_event(ua_event, uevent); |
d0b96690 | 1418 | add_unique_ust_app_event(ua_chan, ua_event); |
48842b30 | 1419 | } |
48842b30 DG |
1420 | } |
1421 | ||
fc34caaa | 1422 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1423 | } |
1424 | ||
5b4a0ec0 DG |
1425 | /* |
1426 | * Copy data between a UST app session and a regular LTT session. | |
1427 | */ | |
421cb601 | 1428 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1429 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1430 | { |
bec39940 DG |
1431 | struct lttng_ht_node_str *ua_chan_node; |
1432 | struct lttng_ht_iter iter; | |
48842b30 DG |
1433 | struct ltt_ust_channel *uchan; |
1434 | struct ust_app_channel *ua_chan; | |
477d7741 MD |
1435 | time_t rawtime; |
1436 | struct tm *timeinfo; | |
1437 | char datetime[16]; | |
1438 | int ret; | |
1439 | ||
1440 | /* Get date and time for unique app path */ | |
1441 | time(&rawtime); | |
1442 | timeinfo = localtime(&rawtime); | |
1443 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1444 | |
421cb601 | 1445 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1446 | |
7972aab2 DG |
1447 | ua_sess->tracing_id = usess->id; |
1448 | ua_sess->id = get_next_session_id(); | |
1449 | ua_sess->uid = app->uid; | |
1450 | ua_sess->gid = app->gid; | |
1451 | ua_sess->euid = usess->uid; | |
1452 | ua_sess->egid = usess->gid; | |
1453 | ua_sess->buffer_type = usess->buffer_type; | |
1454 | ua_sess->bits_per_long = app->bits_per_long; | |
1455 | /* There is only one consumer object per session possible. */ | |
1456 | ua_sess->consumer = usess->consumer; | |
1457 | ||
1458 | switch (ua_sess->buffer_type) { | |
1459 | case LTTNG_BUFFER_PER_PID: | |
1460 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 1461 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
1462 | datetime); |
1463 | break; | |
1464 | case LTTNG_BUFFER_PER_UID: | |
1465 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1466 | DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long); | |
1467 | break; | |
1468 | default: | |
1469 | assert(0); | |
1470 | goto error; | |
1471 | } | |
477d7741 MD |
1472 | if (ret < 0) { |
1473 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1474 | assert(0); |
7972aab2 | 1475 | goto error; |
477d7741 MD |
1476 | } |
1477 | ||
48842b30 | 1478 | /* Iterate over all channels in global domain. */ |
bec39940 DG |
1479 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, |
1480 | uchan, node.node) { | |
1481 | struct lttng_ht_iter uiter; | |
ba767faf | 1482 | |
bec39940 DG |
1483 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
1484 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
5b4a0ec0 | 1485 | if (ua_chan_node != NULL) { |
fc34caaa | 1486 | /* Session exist. Contiuing. */ |
5b4a0ec0 DG |
1487 | continue; |
1488 | } | |
421cb601 | 1489 | |
5b4a0ec0 DG |
1490 | DBG2("Channel %s not found on shadow session copy, creating it", |
1491 | uchan->name); | |
d0b96690 | 1492 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
5b4a0ec0 | 1493 | if (ua_chan == NULL) { |
fc34caaa | 1494 | /* malloc failed FIXME: Might want to do handle ENOMEM .. */ |
5b4a0ec0 | 1495 | continue; |
48842b30 | 1496 | } |
5b4a0ec0 | 1497 | shadow_copy_channel(ua_chan, uchan); |
ffe60014 DG |
1498 | /* |
1499 | * The concept of metadata channel does not exist on the tracing | |
1500 | * registry side of the session daemon so this can only be a per CPU | |
1501 | * channel and not metadata. | |
1502 | */ | |
1503 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
1504 | ||
bec39940 | 1505 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); |
48842b30 | 1506 | } |
7972aab2 DG |
1507 | |
1508 | error: | |
1509 | return; | |
48842b30 DG |
1510 | } |
1511 | ||
78f0bacd DG |
1512 | /* |
1513 | * Lookup sesison wrapper. | |
1514 | */ | |
84cd17c6 MD |
1515 | static |
1516 | void __lookup_session_by_app(struct ltt_ust_session *usess, | |
bec39940 | 1517 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1518 | { |
1519 | /* Get right UST app session from app */ | |
77c5447b | 1520 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
1521 | } |
1522 | ||
421cb601 DG |
1523 | /* |
1524 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1525 | * id. |
421cb601 | 1526 | */ |
48842b30 DG |
1527 | static struct ust_app_session *lookup_session_by_app( |
1528 | struct ltt_ust_session *usess, struct ust_app *app) | |
1529 | { | |
bec39940 | 1530 | struct lttng_ht_iter iter; |
77c5447b | 1531 | struct lttng_ht_node_u64 *node; |
48842b30 | 1532 | |
84cd17c6 | 1533 | __lookup_session_by_app(usess, app, &iter); |
77c5447b | 1534 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
1535 | if (node == NULL) { |
1536 | goto error; | |
1537 | } | |
1538 | ||
1539 | return caa_container_of(node, struct ust_app_session, node); | |
1540 | ||
1541 | error: | |
1542 | return NULL; | |
1543 | } | |
1544 | ||
7972aab2 DG |
1545 | /* |
1546 | * Setup buffer registry per PID for the given session and application. If none | |
1547 | * is found, a new one is created, added to the global registry and | |
1548 | * initialized. If regp is valid, it's set with the newly created object. | |
1549 | * | |
1550 | * Return 0 on success or else a negative value. | |
1551 | */ | |
1552 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
1553 | struct ust_app *app, struct buffer_reg_pid **regp) | |
1554 | { | |
1555 | int ret = 0; | |
1556 | struct buffer_reg_pid *reg_pid; | |
1557 | ||
1558 | assert(ua_sess); | |
1559 | assert(app); | |
1560 | ||
1561 | rcu_read_lock(); | |
1562 | ||
1563 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
1564 | if (!reg_pid) { | |
1565 | /* | |
1566 | * This is the create channel path meaning that if there is NO | |
1567 | * registry available, we have to create one for this session. | |
1568 | */ | |
1569 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid); | |
1570 | if (ret < 0) { | |
1571 | goto error; | |
1572 | } | |
1573 | buffer_reg_pid_add(reg_pid); | |
1574 | } else { | |
1575 | goto end; | |
1576 | } | |
1577 | ||
1578 | /* Initialize registry. */ | |
1579 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
1580 | app->bits_per_long, app->uint8_t_alignment, | |
1581 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1582 | app->uint64_t_alignment, app->long_alignment, |
1583 | app->byte_order, app->version.major, | |
1584 | app->version.minor); | |
7972aab2 DG |
1585 | if (ret < 0) { |
1586 | goto error; | |
1587 | } | |
1588 | ||
1589 | DBG3("UST app buffer registry per PID created successfully"); | |
1590 | ||
1591 | end: | |
1592 | if (regp) { | |
1593 | *regp = reg_pid; | |
1594 | } | |
1595 | error: | |
1596 | rcu_read_unlock(); | |
1597 | return ret; | |
1598 | } | |
1599 | ||
1600 | /* | |
1601 | * Setup buffer registry per UID for the given session and application. If none | |
1602 | * is found, a new one is created, added to the global registry and | |
1603 | * initialized. If regp is valid, it's set with the newly created object. | |
1604 | * | |
1605 | * Return 0 on success or else a negative value. | |
1606 | */ | |
1607 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
1608 | struct ust_app *app, struct buffer_reg_uid **regp) | |
1609 | { | |
1610 | int ret = 0; | |
1611 | struct buffer_reg_uid *reg_uid; | |
1612 | ||
1613 | assert(usess); | |
1614 | assert(app); | |
1615 | ||
1616 | rcu_read_lock(); | |
1617 | ||
1618 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
1619 | if (!reg_uid) { | |
1620 | /* | |
1621 | * This is the create channel path meaning that if there is NO | |
1622 | * registry available, we have to create one for this session. | |
1623 | */ | |
1624 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
1625 | LTTNG_DOMAIN_UST, ®_uid); | |
1626 | if (ret < 0) { | |
1627 | goto error; | |
1628 | } | |
1629 | buffer_reg_uid_add(reg_uid); | |
1630 | } else { | |
1631 | goto end; | |
1632 | } | |
1633 | ||
1634 | /* Initialize registry. */ | |
af6142cf | 1635 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
1636 | app->bits_per_long, app->uint8_t_alignment, |
1637 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1638 | app->uint64_t_alignment, app->long_alignment, |
1639 | app->byte_order, app->version.major, | |
1640 | app->version.minor); | |
7972aab2 DG |
1641 | if (ret < 0) { |
1642 | goto error; | |
1643 | } | |
1644 | /* Add node to teardown list of the session. */ | |
1645 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
1646 | ||
1647 | DBG3("UST app buffer registry per UID created successfully"); | |
1648 | ||
1649 | end: | |
1650 | if (regp) { | |
1651 | *regp = reg_uid; | |
1652 | } | |
1653 | error: | |
1654 | rcu_read_unlock(); | |
1655 | return ret; | |
1656 | } | |
1657 | ||
421cb601 | 1658 | /* |
3d8ca23b | 1659 | * Create a session on the tracer side for the given app. |
421cb601 | 1660 | * |
3d8ca23b DG |
1661 | * On success, ua_sess_ptr is populated with the session pointer or else left |
1662 | * untouched. If the session was created, is_created is set to 1. On error, | |
1663 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
1664 | * be NULL. | |
1665 | * | |
1666 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
1667 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 1668 | */ |
3d8ca23b DG |
1669 | static int create_ust_app_session(struct ltt_ust_session *usess, |
1670 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, | |
1671 | int *is_created) | |
421cb601 | 1672 | { |
3d8ca23b | 1673 | int ret, created = 0; |
421cb601 DG |
1674 | struct ust_app_session *ua_sess; |
1675 | ||
3d8ca23b DG |
1676 | assert(usess); |
1677 | assert(app); | |
1678 | assert(ua_sess_ptr); | |
1679 | ||
840cb59c | 1680 | health_code_update(); |
86acf0da | 1681 | |
421cb601 DG |
1682 | ua_sess = lookup_session_by_app(usess, app); |
1683 | if (ua_sess == NULL) { | |
77c5447b | 1684 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 1685 | app->pid, usess->id); |
d0b96690 | 1686 | ua_sess = alloc_ust_app_session(app); |
421cb601 DG |
1687 | if (ua_sess == NULL) { |
1688 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
1689 | ret = -ENOMEM; |
1690 | goto error; | |
421cb601 | 1691 | } |
477d7741 | 1692 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 1693 | created = 1; |
421cb601 DG |
1694 | } |
1695 | ||
7972aab2 DG |
1696 | switch (usess->buffer_type) { |
1697 | case LTTNG_BUFFER_PER_PID: | |
1698 | /* Init local registry. */ | |
1699 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 1700 | if (ret < 0) { |
7972aab2 DG |
1701 | goto error; |
1702 | } | |
1703 | break; | |
1704 | case LTTNG_BUFFER_PER_UID: | |
1705 | /* Look for a global registry. If none exists, create one. */ | |
1706 | ret = setup_buffer_reg_uid(usess, app, NULL); | |
1707 | if (ret < 0) { | |
1708 | goto error; | |
1709 | } | |
1710 | break; | |
1711 | default: | |
1712 | assert(0); | |
1713 | ret = -EINVAL; | |
1714 | goto error; | |
1715 | } | |
1716 | ||
1717 | health_code_update(); | |
1718 | ||
1719 | if (ua_sess->handle == -1) { | |
1720 | ret = ustctl_create_session(app->sock); | |
1721 | if (ret < 0) { | |
1722 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1723 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
1724 | app->pid, ret); |
1725 | } else { | |
1726 | DBG("UST app creating session failed. Application is dead"); | |
1727 | } | |
d0b96690 | 1728 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
1729 | if (ret != -ENOMEM) { |
1730 | /* | |
1731 | * Tracer is probably gone or got an internal error so let's | |
1732 | * behave like it will soon unregister or not usable. | |
1733 | */ | |
1734 | ret = -ENOTCONN; | |
1735 | } | |
1736 | goto error; | |
421cb601 DG |
1737 | } |
1738 | ||
7972aab2 DG |
1739 | ua_sess->handle = ret; |
1740 | ||
1741 | /* Add ust app session to app's HT */ | |
77c5447b MD |
1742 | lttng_ht_node_init_u64(&ua_sess->node, |
1743 | ua_sess->tracing_id); | |
1744 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
7972aab2 DG |
1745 | |
1746 | DBG2("UST app session created successfully with handle %d", ret); | |
1747 | } | |
1748 | ||
1749 | *ua_sess_ptr = ua_sess; | |
1750 | if (is_created) { | |
1751 | *is_created = created; | |
1752 | } | |
1753 | ||
1754 | /* Everything went well. */ | |
1755 | ret = 0; | |
1756 | ||
1757 | error: | |
1758 | health_code_update(); | |
1759 | return ret; | |
1760 | } | |
1761 | ||
1762 | /* | |
1763 | * Create a context for the channel on the tracer. | |
1764 | * | |
1765 | * Called with UST app session lock held and a RCU read side lock. | |
1766 | */ | |
1767 | static | |
1768 | int create_ust_app_channel_context(struct ust_app_session *ua_sess, | |
1769 | struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx, | |
1770 | struct ust_app *app) | |
1771 | { | |
1772 | int ret = 0; | |
1773 | struct lttng_ht_iter iter; | |
1774 | struct lttng_ht_node_ulong *node; | |
1775 | struct ust_app_ctx *ua_ctx; | |
1776 | ||
1777 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
1778 | ||
1779 | lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter); | |
1780 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1781 | if (node != NULL) { | |
1782 | ret = -EEXIST; | |
1783 | goto error; | |
1784 | } | |
1785 | ||
1786 | ua_ctx = alloc_ust_app_ctx(uctx); | |
1787 | if (ua_ctx == NULL) { | |
1788 | /* malloc failed */ | |
1789 | ret = -1; | |
1790 | goto error; | |
1791 | } | |
1792 | ||
1793 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
1794 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
1795 | ||
1796 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
1797 | if (ret < 0) { | |
1798 | goto error; | |
1799 | } | |
1800 | ||
1801 | error: | |
1802 | return ret; | |
1803 | } | |
1804 | ||
1805 | /* | |
1806 | * Enable on the tracer side a ust app event for the session and channel. | |
1807 | * | |
1808 | * Called with UST app session lock held. | |
1809 | */ | |
1810 | static | |
1811 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
1812 | struct ust_app_event *ua_event, struct ust_app *app) | |
1813 | { | |
1814 | int ret; | |
1815 | ||
1816 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1817 | if (ret < 0) { | |
1818 | goto error; | |
1819 | } | |
1820 | ||
1821 | ua_event->enabled = 1; | |
1822 | ||
1823 | error: | |
1824 | return ret; | |
1825 | } | |
1826 | ||
1827 | /* | |
1828 | * Disable on the tracer side a ust app event for the session and channel. | |
1829 | */ | |
1830 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
1831 | struct ust_app_event *ua_event, struct ust_app *app) | |
1832 | { | |
1833 | int ret; | |
1834 | ||
1835 | ret = disable_ust_event(app, ua_sess, ua_event); | |
1836 | if (ret < 0) { | |
1837 | goto error; | |
1838 | } | |
1839 | ||
1840 | ua_event->enabled = 0; | |
1841 | ||
1842 | error: | |
1843 | return ret; | |
1844 | } | |
1845 | ||
1846 | /* | |
1847 | * Lookup ust app channel for session and disable it on the tracer side. | |
1848 | */ | |
1849 | static | |
1850 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
1851 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
1852 | { | |
1853 | int ret; | |
1854 | ||
1855 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
1856 | if (ret < 0) { | |
1857 | goto error; | |
1858 | } | |
1859 | ||
1860 | ua_chan->enabled = 0; | |
1861 | ||
1862 | error: | |
1863 | return ret; | |
1864 | } | |
1865 | ||
1866 | /* | |
1867 | * Lookup ust app channel for session and enable it on the tracer side. This | |
1868 | * MUST be called with a RCU read side lock acquired. | |
1869 | */ | |
1870 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
1871 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
1872 | { | |
1873 | int ret = 0; | |
1874 | struct lttng_ht_iter iter; | |
1875 | struct lttng_ht_node_str *ua_chan_node; | |
1876 | struct ust_app_channel *ua_chan; | |
1877 | ||
1878 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
1879 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
1880 | if (ua_chan_node == NULL) { | |
77c5447b | 1881 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
1882 | uchan->name, ua_sess->tracing_id); |
1883 | goto error; | |
1884 | } | |
1885 | ||
1886 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
1887 | ||
1888 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
1889 | if (ret < 0) { | |
1890 | goto error; | |
1891 | } | |
1892 | ||
1893 | error: | |
1894 | return ret; | |
1895 | } | |
1896 | ||
1897 | /* | |
1898 | * Ask the consumer to create a channel and get it if successful. | |
1899 | * | |
1900 | * Return 0 on success or else a negative value. | |
1901 | */ | |
1902 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
1903 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
1904 | int bitness, struct ust_registry_session *registry) | |
1905 | { | |
1906 | int ret; | |
1907 | unsigned int nb_fd = 0; | |
1908 | struct consumer_socket *socket; | |
1909 | ||
1910 | assert(usess); | |
1911 | assert(ua_sess); | |
1912 | assert(ua_chan); | |
1913 | assert(registry); | |
1914 | ||
1915 | rcu_read_lock(); | |
1916 | health_code_update(); | |
1917 | ||
1918 | /* Get the right consumer socket for the application. */ | |
1919 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
1920 | if (!socket) { | |
1921 | ret = -EINVAL; | |
1922 | goto error; | |
1923 | } | |
1924 | ||
1925 | health_code_update(); | |
1926 | ||
1927 | /* Need one fd for the channel. */ | |
1928 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
1929 | if (ret < 0) { | |
1930 | ERR("Exhausted number of available FD upon create channel"); | |
1931 | goto error; | |
1932 | } | |
1933 | ||
1934 | /* | |
1935 | * Ask consumer to create channel. The consumer will return the number of | |
1936 | * stream we have to expect. | |
1937 | */ | |
1938 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
1939 | registry); | |
1940 | if (ret < 0) { | |
1941 | goto error_ask; | |
1942 | } | |
1943 | ||
1944 | /* | |
1945 | * Compute the number of fd needed before receiving them. It must be 2 per | |
1946 | * stream (2 being the default value here). | |
1947 | */ | |
1948 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
1949 | ||
1950 | /* Reserve the amount of file descriptor we need. */ | |
1951 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
1952 | if (ret < 0) { | |
1953 | ERR("Exhausted number of available FD upon create channel"); | |
1954 | goto error_fd_get_stream; | |
1955 | } | |
1956 | ||
1957 | health_code_update(); | |
1958 | ||
1959 | /* | |
1960 | * Now get the channel from the consumer. This call wil populate the stream | |
1961 | * list of that channel and set the ust objects. | |
1962 | */ | |
d9078d0c DG |
1963 | if (usess->consumer->enabled) { |
1964 | ret = ust_consumer_get_channel(socket, ua_chan); | |
1965 | if (ret < 0) { | |
1966 | goto error_destroy; | |
1967 | } | |
7972aab2 DG |
1968 | } |
1969 | ||
1970 | rcu_read_unlock(); | |
1971 | return 0; | |
1972 | ||
1973 | error_destroy: | |
1974 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
1975 | error_fd_get_stream: | |
1976 | /* | |
1977 | * Initiate a destroy channel on the consumer since we had an error | |
1978 | * handling it on our side. The return value is of no importance since we | |
1979 | * already have a ret value set by the previous error that we need to | |
1980 | * return. | |
1981 | */ | |
1982 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
1983 | error_ask: | |
1984 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
1985 | error: | |
1986 | health_code_update(); | |
1987 | rcu_read_unlock(); | |
1988 | return ret; | |
1989 | } | |
1990 | ||
1991 | /* | |
1992 | * Duplicate the ust data object of the ust app stream and save it in the | |
1993 | * buffer registry stream. | |
1994 | * | |
1995 | * Return 0 on success or else a negative value. | |
1996 | */ | |
1997 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
1998 | struct ust_app_stream *stream) | |
1999 | { | |
2000 | int ret; | |
2001 | ||
2002 | assert(reg_stream); | |
2003 | assert(stream); | |
2004 | ||
2005 | /* Reserve the amount of file descriptor we need. */ | |
2006 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2007 | if (ret < 0) { | |
2008 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2009 | goto error; | |
2010 | } | |
2011 | ||
2012 | /* Duplicate object for stream once the original is in the registry. */ | |
2013 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2014 | reg_stream->obj.ust); | |
2015 | if (ret < 0) { | |
2016 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2017 | reg_stream->obj.ust, stream->obj, ret); | |
2018 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2019 | goto error; | |
2020 | } | |
2021 | stream->handle = stream->obj->handle; | |
2022 | ||
2023 | error: | |
2024 | return ret; | |
2025 | } | |
2026 | ||
2027 | /* | |
2028 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2029 | * buffer registry channel. | |
2030 | * | |
2031 | * Return 0 on success or else a negative value. | |
2032 | */ | |
2033 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2034 | struct ust_app_channel *ua_chan) | |
2035 | { | |
2036 | int ret; | |
2037 | ||
2038 | assert(reg_chan); | |
2039 | assert(ua_chan); | |
2040 | ||
2041 | /* Need two fds for the channel. */ | |
2042 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2043 | if (ret < 0) { | |
2044 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2045 | goto error_fd_get; | |
2046 | } | |
2047 | ||
2048 | /* Duplicate object for stream once the original is in the registry. */ | |
2049 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2050 | if (ret < 0) { | |
2051 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2052 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2053 | goto error; | |
2054 | } | |
2055 | ua_chan->handle = ua_chan->obj->handle; | |
2056 | ||
2057 | return 0; | |
2058 | ||
2059 | error: | |
2060 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2061 | error_fd_get: | |
2062 | return ret; | |
2063 | } | |
2064 | ||
2065 | /* | |
2066 | * For a given channel buffer registry, setup all streams of the given ust | |
2067 | * application channel. | |
2068 | * | |
2069 | * Return 0 on success or else a negative value. | |
2070 | */ | |
2071 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
2072 | struct ust_app_channel *ua_chan) | |
2073 | { | |
2074 | int ret = 0; | |
2075 | struct ust_app_stream *stream, *stmp; | |
2076 | ||
2077 | assert(reg_chan); | |
2078 | assert(ua_chan); | |
2079 | ||
2080 | DBG2("UST app setup buffer registry stream"); | |
2081 | ||
2082 | /* Send all streams to application. */ | |
2083 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2084 | struct buffer_reg_stream *reg_stream; | |
2085 | ||
2086 | ret = buffer_reg_stream_create(®_stream); | |
2087 | if (ret < 0) { | |
2088 | goto error; | |
2089 | } | |
2090 | ||
2091 | /* | |
2092 | * Keep original pointer and nullify it in the stream so the delete | |
2093 | * stream call does not release the object. | |
2094 | */ | |
2095 | reg_stream->obj.ust = stream->obj; | |
2096 | stream->obj = NULL; | |
2097 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2098 | |
7972aab2 DG |
2099 | /* We don't need the streams anymore. */ |
2100 | cds_list_del(&stream->list); | |
2101 | delete_ust_app_stream(-1, stream); | |
2102 | } | |
421cb601 | 2103 | |
7972aab2 DG |
2104 | error: |
2105 | return ret; | |
2106 | } | |
2107 | ||
2108 | /* | |
2109 | * Create a buffer registry channel for the given session registry and | |
2110 | * application channel object. If regp pointer is valid, it's set with the | |
2111 | * created object. Important, the created object is NOT added to the session | |
2112 | * registry hash table. | |
2113 | * | |
2114 | * Return 0 on success else a negative value. | |
2115 | */ | |
2116 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2117 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2118 | { | |
2119 | int ret; | |
2120 | struct buffer_reg_channel *reg_chan = NULL; | |
2121 | ||
2122 | assert(reg_sess); | |
2123 | assert(ua_chan); | |
2124 | ||
2125 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2126 | ||
2127 | /* Create buffer registry channel. */ | |
2128 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2129 | if (ret < 0) { | |
2130 | goto error_create; | |
421cb601 | 2131 | } |
7972aab2 DG |
2132 | assert(reg_chan); |
2133 | reg_chan->consumer_key = ua_chan->key; | |
421cb601 | 2134 | |
7972aab2 DG |
2135 | /* Create and add a channel registry to session. */ |
2136 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2137 | ua_chan->tracing_channel_id); | |
2138 | if (ret < 0) { | |
2139 | goto error; | |
d88aee68 | 2140 | } |
7972aab2 | 2141 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2142 | |
7972aab2 DG |
2143 | if (regp) { |
2144 | *regp = reg_chan; | |
3d8ca23b | 2145 | } |
d88aee68 | 2146 | |
7972aab2 | 2147 | return 0; |
3d8ca23b DG |
2148 | |
2149 | error: | |
7972aab2 DG |
2150 | /* Safe because the registry channel object was not added to any HT. */ |
2151 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2152 | error_create: | |
3d8ca23b | 2153 | return ret; |
421cb601 DG |
2154 | } |
2155 | ||
55cc08a6 | 2156 | /* |
7972aab2 DG |
2157 | * Setup buffer registry channel for the given session registry and application |
2158 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2159 | * |
7972aab2 | 2160 | * Return 0 on success else a negative value. |
55cc08a6 | 2161 | */ |
7972aab2 DG |
2162 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
2163 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan) | |
55cc08a6 | 2164 | { |
7972aab2 | 2165 | int ret; |
55cc08a6 | 2166 | |
7972aab2 DG |
2167 | assert(reg_sess); |
2168 | assert(reg_chan); | |
2169 | assert(ua_chan); | |
2170 | assert(ua_chan->obj); | |
55cc08a6 | 2171 | |
7972aab2 | 2172 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2173 | |
7972aab2 DG |
2174 | /* Setup all streams for the registry. */ |
2175 | ret = setup_buffer_reg_streams(reg_chan, ua_chan); | |
2176 | if (ret < 0) { | |
55cc08a6 DG |
2177 | goto error; |
2178 | } | |
2179 | ||
7972aab2 DG |
2180 | reg_chan->obj.ust = ua_chan->obj; |
2181 | ua_chan->obj = NULL; | |
55cc08a6 | 2182 | |
7972aab2 | 2183 | return 0; |
55cc08a6 DG |
2184 | |
2185 | error: | |
7972aab2 DG |
2186 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2187 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2188 | return ret; |
2189 | } | |
2190 | ||
edb67388 | 2191 | /* |
7972aab2 | 2192 | * Send buffer registry channel to the application. |
d0b96690 | 2193 | * |
7972aab2 | 2194 | * Return 0 on success else a negative value. |
edb67388 | 2195 | */ |
7972aab2 DG |
2196 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2197 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2198 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2199 | { |
2200 | int ret; | |
7972aab2 | 2201 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2202 | |
7972aab2 DG |
2203 | assert(reg_chan); |
2204 | assert(app); | |
2205 | assert(ua_sess); | |
2206 | assert(ua_chan); | |
2207 | ||
2208 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2209 | ||
2210 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2211 | if (ret < 0) { |
2212 | goto error; | |
2213 | } | |
2214 | ||
7972aab2 DG |
2215 | /* Send channel to the application. */ |
2216 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
2217 | if (ret < 0) { | |
2218 | goto error; | |
2219 | } | |
2220 | ||
2221 | health_code_update(); | |
2222 | ||
2223 | /* Send all streams to application. */ | |
2224 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2225 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2226 | struct ust_app_stream stream; | |
2227 | ||
2228 | ret = duplicate_stream_object(reg_stream, &stream); | |
2229 | if (ret < 0) { | |
2230 | goto error_stream_unlock; | |
2231 | } | |
2232 | ||
2233 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2234 | if (ret < 0) { | |
8c067051 | 2235 | (void) release_ust_app_stream(-1, &stream); |
7972aab2 DG |
2236 | goto error_stream_unlock; |
2237 | } | |
edb67388 | 2238 | |
7972aab2 DG |
2239 | /* |
2240 | * The return value is not important here. This function will output an | |
2241 | * error if needed. | |
2242 | */ | |
2243 | (void) release_ust_app_stream(-1, &stream); | |
2244 | } | |
2245 | ua_chan->is_sent = 1; | |
2246 | ||
2247 | error_stream_unlock: | |
2248 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2249 | error: |
2250 | return ret; | |
2251 | } | |
2252 | ||
9730260e | 2253 | /* |
7972aab2 DG |
2254 | * Create and send to the application the created buffers with per UID buffers. |
2255 | * | |
2256 | * Return 0 on success else a negative value. | |
9730260e | 2257 | */ |
7972aab2 DG |
2258 | static int create_channel_per_uid(struct ust_app *app, |
2259 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2260 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2261 | { |
2262 | int ret; | |
7972aab2 DG |
2263 | struct buffer_reg_uid *reg_uid; |
2264 | struct buffer_reg_channel *reg_chan; | |
9730260e | 2265 | |
7972aab2 DG |
2266 | assert(app); |
2267 | assert(usess); | |
2268 | assert(ua_sess); | |
2269 | assert(ua_chan); | |
2270 | ||
2271 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2272 | ||
2273 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2274 | /* | |
2275 | * The session creation handles the creation of this global registry | |
2276 | * object. If none can be find, there is a code flow problem or a | |
2277 | * teardown race. | |
2278 | */ | |
2279 | assert(reg_uid); | |
2280 | ||
2281 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2282 | reg_uid); | |
2283 | if (!reg_chan) { | |
2284 | /* Create the buffer registry channel object. */ | |
2285 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2286 | if (ret < 0) { | |
2287 | goto error; | |
2288 | } | |
2289 | assert(reg_chan); | |
2290 | ||
2291 | /* | |
2292 | * Create the buffers on the consumer side. This call populates the | |
2293 | * ust app channel object with all streams and data object. | |
2294 | */ | |
2295 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2296 | app->bits_per_long, reg_uid->registry->reg.ust); | |
2297 | if (ret < 0) { | |
07d2ae95 DG |
2298 | /* |
2299 | * Let's remove the previously created buffer registry channel so | |
2300 | * it's not visible anymore in the session registry. | |
2301 | */ | |
2302 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, | |
2303 | ua_chan->tracing_channel_id); | |
2304 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
2305 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
7972aab2 DG |
2306 | goto error; |
2307 | } | |
2308 | ||
2309 | /* | |
2310 | * Setup the streams and add it to the session registry. | |
2311 | */ | |
2312 | ret = setup_buffer_reg_channel(reg_uid->registry, ua_chan, reg_chan); | |
2313 | if (ret < 0) { | |
2314 | goto error; | |
2315 | } | |
2316 | ||
2317 | } | |
2318 | ||
2319 | /* Send buffers to the application. */ | |
2320 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
9730260e DG |
2321 | if (ret < 0) { |
2322 | goto error; | |
2323 | } | |
2324 | ||
9730260e DG |
2325 | error: |
2326 | return ret; | |
2327 | } | |
2328 | ||
78f0bacd | 2329 | /* |
7972aab2 DG |
2330 | * Create and send to the application the created buffers with per PID buffers. |
2331 | * | |
2332 | * Return 0 on success else a negative value. | |
78f0bacd | 2333 | */ |
7972aab2 DG |
2334 | static int create_channel_per_pid(struct ust_app *app, |
2335 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2336 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2337 | { |
8535a6d9 | 2338 | int ret; |
7972aab2 | 2339 | struct ust_registry_session *registry; |
78f0bacd | 2340 | |
7972aab2 DG |
2341 | assert(app); |
2342 | assert(usess); | |
2343 | assert(ua_sess); | |
2344 | assert(ua_chan); | |
2345 | ||
2346 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2347 | ||
2348 | rcu_read_lock(); | |
2349 | ||
2350 | registry = get_session_registry(ua_sess); | |
2351 | assert(registry); | |
2352 | ||
2353 | /* Create and add a new channel registry to session. */ | |
2354 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd DG |
2355 | if (ret < 0) { |
2356 | goto error; | |
2357 | } | |
2358 | ||
7972aab2 DG |
2359 | /* Create and get channel on the consumer side. */ |
2360 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2361 | app->bits_per_long, registry); | |
2362 | if (ret < 0) { | |
2363 | goto error; | |
2364 | } | |
2365 | ||
2366 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
2367 | if (ret < 0) { | |
2368 | goto error; | |
2369 | } | |
8535a6d9 | 2370 | |
78f0bacd | 2371 | error: |
7972aab2 | 2372 | rcu_read_unlock(); |
78f0bacd DG |
2373 | return ret; |
2374 | } | |
2375 | ||
2376 | /* | |
7972aab2 DG |
2377 | * From an already allocated ust app channel, create the channel buffers if |
2378 | * need and send it to the application. This MUST be called with a RCU read | |
2379 | * side lock acquired. | |
2380 | * | |
2381 | * Return 0 on success or else a negative value. | |
78f0bacd | 2382 | */ |
7972aab2 DG |
2383 | static int do_create_channel(struct ust_app *app, |
2384 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2385 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2386 | { |
7972aab2 | 2387 | int ret; |
78f0bacd | 2388 | |
7972aab2 DG |
2389 | assert(app); |
2390 | assert(usess); | |
2391 | assert(ua_sess); | |
2392 | assert(ua_chan); | |
2393 | ||
2394 | /* Handle buffer type before sending the channel to the application. */ | |
2395 | switch (usess->buffer_type) { | |
2396 | case LTTNG_BUFFER_PER_UID: | |
2397 | { | |
2398 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
2399 | if (ret < 0) { | |
2400 | goto error; | |
2401 | } | |
2402 | break; | |
2403 | } | |
2404 | case LTTNG_BUFFER_PER_PID: | |
2405 | { | |
2406 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
2407 | if (ret < 0) { | |
2408 | goto error; | |
2409 | } | |
2410 | break; | |
2411 | } | |
2412 | default: | |
2413 | assert(0); | |
2414 | ret = -EINVAL; | |
78f0bacd DG |
2415 | goto error; |
2416 | } | |
2417 | ||
7972aab2 DG |
2418 | /* Initialize ust objd object using the received handle and add it. */ |
2419 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
2420 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 2421 | |
7972aab2 DG |
2422 | /* If channel is not enabled, disable it on the tracer */ |
2423 | if (!ua_chan->enabled) { | |
2424 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2425 | if (ret < 0) { | |
2426 | goto error; | |
2427 | } | |
78f0bacd DG |
2428 | } |
2429 | ||
2430 | error: | |
2431 | return ret; | |
2432 | } | |
2433 | ||
284d8f55 | 2434 | /* |
4d710ac2 DG |
2435 | * Create UST app channel and create it on the tracer. Set ua_chanp of the |
2436 | * newly created channel if not NULL. | |
d0b96690 | 2437 | * |
36b588ed | 2438 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 DG |
2439 | * |
2440 | * Return 0 on success or else a negative value. | |
284d8f55 | 2441 | */ |
4d710ac2 DG |
2442 | static int create_ust_app_channel(struct ust_app_session *ua_sess, |
2443 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
7972aab2 | 2444 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 2445 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
2446 | { |
2447 | int ret = 0; | |
bec39940 DG |
2448 | struct lttng_ht_iter iter; |
2449 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
2450 | struct ust_app_channel *ua_chan; |
2451 | ||
2452 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
2453 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
2454 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 2455 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 2456 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 2457 | goto end; |
5b4a0ec0 DG |
2458 | } |
2459 | ||
d0b96690 | 2460 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
2461 | if (ua_chan == NULL) { |
2462 | /* Only malloc can fail here */ | |
4d710ac2 | 2463 | ret = -ENOMEM; |
094d1690 | 2464 | goto error_alloc; |
fc34caaa DG |
2465 | } |
2466 | shadow_copy_channel(ua_chan, uchan); | |
2467 | ||
ffe60014 DG |
2468 | /* Set channel type. */ |
2469 | ua_chan->attr.type = type; | |
2470 | ||
7972aab2 | 2471 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
5b4a0ec0 DG |
2472 | if (ret < 0) { |
2473 | goto error; | |
2474 | } | |
2475 | ||
fc34caaa | 2476 | DBG2("UST app create channel %s for PID %d completed", ua_chan->name, |
852d0037 | 2477 | app->pid); |
fc34caaa | 2478 | |
d0b96690 DG |
2479 | /* Only add the channel if successful on the tracer side. */ |
2480 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
2481 | ||
fc34caaa | 2482 | end: |
4d710ac2 DG |
2483 | if (ua_chanp) { |
2484 | *ua_chanp = ua_chan; | |
2485 | } | |
2486 | ||
2487 | /* Everything went well. */ | |
2488 | return 0; | |
5b4a0ec0 DG |
2489 | |
2490 | error: | |
d0b96690 | 2491 | delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app); |
094d1690 | 2492 | error_alloc: |
4d710ac2 | 2493 | return ret; |
5b4a0ec0 DG |
2494 | } |
2495 | ||
2496 | /* | |
2497 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
2498 | * |
2499 | * Called with ust app session mutex held. | |
5b4a0ec0 | 2500 | */ |
edb67388 DG |
2501 | static |
2502 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
2503 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
2504 | struct ust_app *app) | |
284d8f55 | 2505 | { |
edb67388 | 2506 | int ret = 0; |
5b4a0ec0 | 2507 | struct ust_app_event *ua_event; |
284d8f55 | 2508 | |
5b4a0ec0 | 2509 | /* Get event node */ |
18eace3b DG |
2510 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
2511 | uevent->filter, uevent->attr.loglevel); | |
2512 | if (ua_event != NULL) { | |
fc34caaa | 2513 | ret = -EEXIST; |
edb67388 DG |
2514 | goto end; |
2515 | } | |
5b4a0ec0 | 2516 | |
edb67388 DG |
2517 | /* Does not exist so create one */ |
2518 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); | |
2519 | if (ua_event == NULL) { | |
2520 | /* Only malloc can failed so something is really wrong */ | |
2521 | ret = -ENOMEM; | |
fc34caaa | 2522 | goto end; |
5b4a0ec0 | 2523 | } |
edb67388 | 2524 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 2525 | |
edb67388 | 2526 | /* Create it on the tracer side */ |
5b4a0ec0 | 2527 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 2528 | if (ret < 0) { |
fc34caaa | 2529 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 2530 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
2531 | goto error; |
2532 | } | |
2533 | ||
d0b96690 | 2534 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 2535 | |
fc34caaa | 2536 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 2537 | app->pid); |
7f79d3a1 | 2538 | |
edb67388 | 2539 | end: |
fc34caaa DG |
2540 | return ret; |
2541 | ||
5b4a0ec0 | 2542 | error: |
fc34caaa DG |
2543 | /* Valid. Calling here is already in a read side lock */ |
2544 | delete_ust_app_event(-1, ua_event); | |
edb67388 | 2545 | return ret; |
5b4a0ec0 DG |
2546 | } |
2547 | ||
2548 | /* | |
2549 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 2550 | * |
7972aab2 | 2551 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
2552 | */ |
2553 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
d65d2de8 DG |
2554 | struct ust_app *app, struct consumer_output *consumer, |
2555 | struct ustctl_consumer_channel_attr *attr) | |
5b4a0ec0 DG |
2556 | { |
2557 | int ret = 0; | |
ffe60014 | 2558 | struct ust_app_channel *metadata; |
d88aee68 | 2559 | struct consumer_socket *socket; |
7972aab2 | 2560 | struct ust_registry_session *registry; |
5b4a0ec0 | 2561 | |
ffe60014 DG |
2562 | assert(ua_sess); |
2563 | assert(app); | |
d88aee68 | 2564 | assert(consumer); |
5b4a0ec0 | 2565 | |
7972aab2 DG |
2566 | registry = get_session_registry(ua_sess); |
2567 | assert(registry); | |
2568 | ||
1b532a60 DG |
2569 | /* Metadata already exists for this registry or it was closed previously */ |
2570 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
2571 | ret = 0; |
2572 | goto error; | |
5b4a0ec0 DG |
2573 | } |
2574 | ||
ffe60014 | 2575 | /* Allocate UST metadata */ |
d0b96690 | 2576 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
2577 | if (!metadata) { |
2578 | /* malloc() failed */ | |
2579 | ret = -ENOMEM; | |
2580 | goto error; | |
2581 | } | |
5b4a0ec0 | 2582 | |
d65d2de8 DG |
2583 | if (!attr) { |
2584 | /* Set default attributes for metadata. */ | |
2585 | metadata->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
2586 | metadata->attr.subbuf_size = default_get_metadata_subbuf_size(); | |
2587 | metadata->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM; | |
0a9c6494 DG |
2588 | metadata->attr.switch_timer_interval = DEFAULT_METADATA_SWITCH_TIMER; |
2589 | metadata->attr.read_timer_interval = DEFAULT_METADATA_READ_TIMER; | |
d65d2de8 DG |
2590 | metadata->attr.output = LTTNG_UST_MMAP; |
2591 | metadata->attr.type = LTTNG_UST_CHAN_METADATA; | |
2592 | } else { | |
2593 | memcpy(&metadata->attr, attr, sizeof(metadata->attr)); | |
2594 | metadata->attr.output = LTTNG_UST_MMAP; | |
2595 | metadata->attr.type = LTTNG_UST_CHAN_METADATA; | |
2596 | } | |
5b4a0ec0 | 2597 | |
7972aab2 DG |
2598 | /* Need one fd for the channel. */ |
2599 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2600 | if (ret < 0) { | |
2601 | ERR("Exhausted number of available FD upon create metadata"); | |
2602 | goto error; | |
2603 | } | |
2604 | ||
4dc3dfc5 DG |
2605 | /* Get the right consumer socket for the application. */ |
2606 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
2607 | if (!socket) { | |
2608 | ret = -EINVAL; | |
2609 | goto error_consumer; | |
2610 | } | |
2611 | ||
331744e3 JD |
2612 | /* |
2613 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
2614 | * to the registry *before* we ask the consumer so we avoid the race of the | |
2615 | * consumer requesting the metadata and the ask_channel call on our side | |
2616 | * did not returned yet. | |
2617 | */ | |
2618 | registry->metadata_key = metadata->key; | |
2619 | ||
d88aee68 DG |
2620 | /* |
2621 | * Ask the metadata channel creation to the consumer. The metadata object | |
2622 | * will be created by the consumer and kept their. However, the stream is | |
2623 | * never added or monitored until we do a first push metadata to the | |
2624 | * consumer. | |
2625 | */ | |
7972aab2 DG |
2626 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
2627 | registry); | |
d88aee68 | 2628 | if (ret < 0) { |
f2a444f1 DG |
2629 | /* Nullify the metadata key so we don't try to close it later on. */ |
2630 | registry->metadata_key = 0; | |
d88aee68 DG |
2631 | goto error_consumer; |
2632 | } | |
2633 | ||
2634 | /* | |
2635 | * The setup command will make the metadata stream be sent to the relayd, | |
2636 | * if applicable, and the thread managing the metadatas. This is important | |
2637 | * because after this point, if an error occurs, the only way the stream | |
2638 | * can be deleted is to be monitored in the consumer. | |
2639 | */ | |
7972aab2 | 2640 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 2641 | if (ret < 0) { |
f2a444f1 DG |
2642 | /* Nullify the metadata key so we don't try to close it later on. */ |
2643 | registry->metadata_key = 0; | |
d88aee68 | 2644 | goto error_consumer; |
5b4a0ec0 DG |
2645 | } |
2646 | ||
7972aab2 DG |
2647 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
2648 | metadata->key, app->pid); | |
5b4a0ec0 | 2649 | |
d88aee68 | 2650 | error_consumer: |
b80f0b6c | 2651 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 2652 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 2653 | error: |
ffe60014 | 2654 | return ret; |
5b4a0ec0 DG |
2655 | } |
2656 | ||
2657 | /* | |
2658 | * Return pointer to traceable apps list. | |
2659 | */ | |
bec39940 | 2660 | struct lttng_ht *ust_app_get_ht(void) |
5b4a0ec0 DG |
2661 | { |
2662 | return ust_app_ht; | |
2663 | } | |
2664 | ||
2665 | /* | |
d88aee68 DG |
2666 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
2667 | * acquired before calling this function. | |
5b4a0ec0 DG |
2668 | */ |
2669 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
2670 | { | |
d88aee68 | 2671 | struct ust_app *app = NULL; |
bec39940 DG |
2672 | struct lttng_ht_node_ulong *node; |
2673 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 2674 | |
bec39940 DG |
2675 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
2676 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
2677 | if (node == NULL) { |
2678 | DBG2("UST app no found with pid %d", pid); | |
2679 | goto error; | |
2680 | } | |
5b4a0ec0 DG |
2681 | |
2682 | DBG2("Found UST app by pid %d", pid); | |
2683 | ||
d88aee68 | 2684 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
2685 | |
2686 | error: | |
d88aee68 | 2687 | return app; |
5b4a0ec0 DG |
2688 | } |
2689 | ||
d88aee68 DG |
2690 | /* |
2691 | * Allocate and init an UST app object using the registration information and | |
2692 | * the command socket. This is called when the command socket connects to the | |
2693 | * session daemon. | |
2694 | * | |
2695 | * The object is returned on success or else NULL. | |
2696 | */ | |
d0b96690 | 2697 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 2698 | { |
d0b96690 DG |
2699 | struct ust_app *lta = NULL; |
2700 | ||
2701 | assert(msg); | |
2702 | assert(sock >= 0); | |
2703 | ||
2704 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 2705 | |
173af62f DG |
2706 | if ((msg->bits_per_long == 64 && |
2707 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
2708 | || (msg->bits_per_long == 32 && | |
2709 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 2710 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
2711 | "%d-bit long, but no consumerd for this size is available.\n", |
2712 | msg->name, msg->pid, msg->bits_per_long); | |
2713 | goto error; | |
3f2c5fcc | 2714 | } |
d0b96690 | 2715 | |
5b4a0ec0 DG |
2716 | lta = zmalloc(sizeof(struct ust_app)); |
2717 | if (lta == NULL) { | |
2718 | PERROR("malloc"); | |
d0b96690 | 2719 | goto error; |
5b4a0ec0 DG |
2720 | } |
2721 | ||
2722 | lta->ppid = msg->ppid; | |
2723 | lta->uid = msg->uid; | |
2724 | lta->gid = msg->gid; | |
d0b96690 | 2725 | |
7753dea8 | 2726 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
2727 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
2728 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
2729 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
2730 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
2731 | lta->long_alignment = msg->long_alignment; | |
2732 | lta->byte_order = msg->byte_order; | |
2733 | ||
5b4a0ec0 DG |
2734 | lta->v_major = msg->major; |
2735 | lta->v_minor = msg->minor; | |
77c5447b | 2736 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 DG |
2737 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
2738 | lta->notify_sock = -1; | |
d88aee68 DG |
2739 | |
2740 | /* Copy name and make sure it's NULL terminated. */ | |
2741 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
2742 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
2743 | ||
2744 | /* | |
2745 | * Before this can be called, when receiving the registration information, | |
2746 | * the application compatibility is checked. So, at this point, the | |
2747 | * application can work with this session daemon. | |
2748 | */ | |
d0b96690 | 2749 | lta->compatible = 1; |
5b4a0ec0 | 2750 | |
852d0037 | 2751 | lta->pid = msg->pid; |
d0b96690 | 2752 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 2753 | lta->sock = sock; |
d0b96690 | 2754 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 2755 | |
d42f20df DG |
2756 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
2757 | ||
d0b96690 DG |
2758 | error: |
2759 | return lta; | |
2760 | } | |
2761 | ||
d88aee68 DG |
2762 | /* |
2763 | * For a given application object, add it to every hash table. | |
2764 | */ | |
d0b96690 DG |
2765 | void ust_app_add(struct ust_app *app) |
2766 | { | |
2767 | assert(app); | |
2768 | assert(app->notify_sock >= 0); | |
2769 | ||
5b4a0ec0 | 2770 | rcu_read_lock(); |
852d0037 DG |
2771 | |
2772 | /* | |
2773 | * On a re-registration, we want to kick out the previous registration of | |
2774 | * that pid | |
2775 | */ | |
d0b96690 | 2776 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
2777 | |
2778 | /* | |
2779 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
2780 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
2781 | * already in the table. | |
2782 | */ | |
d0b96690 | 2783 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 2784 | |
d0b96690 DG |
2785 | /* Add application to the notify socket hash table. */ |
2786 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
2787 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 2788 | |
d0b96690 | 2789 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
2790 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
2791 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
2792 | app->v_minor); | |
5b4a0ec0 | 2793 | |
d0b96690 DG |
2794 | rcu_read_unlock(); |
2795 | } | |
2796 | ||
d88aee68 DG |
2797 | /* |
2798 | * Set the application version into the object. | |
2799 | * | |
2800 | * Return 0 on success else a negative value either an errno code or a | |
2801 | * LTTng-UST error code. | |
2802 | */ | |
d0b96690 DG |
2803 | int ust_app_version(struct ust_app *app) |
2804 | { | |
d88aee68 DG |
2805 | int ret; |
2806 | ||
d0b96690 | 2807 | assert(app); |
d88aee68 DG |
2808 | |
2809 | ret = ustctl_tracer_version(app->sock, &app->version); | |
2810 | if (ret < 0) { | |
2811 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
2812 | ERR("UST app %d verson failed with ret %d", app->sock, ret); | |
2813 | } else { | |
2814 | DBG3("UST app %d verion failed. Application is dead", app->sock); | |
2815 | } | |
2816 | } | |
2817 | ||
2818 | return ret; | |
5b4a0ec0 DG |
2819 | } |
2820 | ||
2821 | /* | |
2822 | * Unregister app by removing it from the global traceable app list and freeing | |
2823 | * the data struct. | |
2824 | * | |
2825 | * The socket is already closed at this point so no close to sock. | |
2826 | */ | |
2827 | void ust_app_unregister(int sock) | |
2828 | { | |
2829 | struct ust_app *lta; | |
bec39940 DG |
2830 | struct lttng_ht_node_ulong *node; |
2831 | struct lttng_ht_iter iter; | |
d42f20df | 2832 | struct ust_app_session *ua_sess; |
525b0740 | 2833 | int ret; |
5b4a0ec0 DG |
2834 | |
2835 | rcu_read_lock(); | |
886459c6 | 2836 | |
5b4a0ec0 | 2837 | /* Get the node reference for a call_rcu */ |
852d0037 | 2838 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 2839 | node = lttng_ht_iter_get_node_ulong(&iter); |
d0b96690 | 2840 | assert(node); |
284d8f55 | 2841 | |
852d0037 | 2842 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
2843 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
2844 | ||
886459c6 | 2845 | /* Remove application from PID hash table */ |
852d0037 DG |
2846 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
2847 | assert(!ret); | |
2848 | ||
d88aee68 DG |
2849 | /* |
2850 | * Remove application from notify hash table. The thread handling the | |
2851 | * notify socket could have deleted the node so ignore on error because | |
2852 | * either way it's valid. The close of that socket is handled by the other | |
2853 | * thread. | |
2854 | */ | |
d0b96690 | 2855 | iter.iter.node = <a->notify_sock_n.node; |
d88aee68 | 2856 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); |
852d0037 | 2857 | |
5b98a774 DG |
2858 | /* |
2859 | * Ignore return value since the node might have been removed before by an | |
2860 | * add replace during app registration because the PID can be reassigned by | |
2861 | * the OS. | |
2862 | */ | |
d0b96690 | 2863 | iter.iter.node = <a->pid_n.node; |
bec39940 | 2864 | ret = lttng_ht_del(ust_app_ht, &iter); |
5b98a774 DG |
2865 | if (ret) { |
2866 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
2867 | lta->pid); | |
2868 | } | |
852d0037 | 2869 | |
d42f20df DG |
2870 | /* Remove sessions so they are not visible during deletion.*/ |
2871 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, | |
2872 | node.node) { | |
7972aab2 DG |
2873 | struct ust_registry_session *registry; |
2874 | ||
d42f20df DG |
2875 | ret = lttng_ht_del(lta->sessions, &iter); |
2876 | if (ret) { | |
2877 | /* The session was already removed so scheduled for teardown. */ | |
2878 | continue; | |
2879 | } | |
2880 | ||
2881 | /* | |
2882 | * Add session to list for teardown. This is safe since at this point we | |
2883 | * are the only one using this list. | |
2884 | */ | |
d88aee68 DG |
2885 | pthread_mutex_lock(&ua_sess->lock); |
2886 | ||
2887 | /* | |
2888 | * Normally, this is done in the delete session process which is | |
2889 | * executed in the call rcu below. However, upon registration we can't | |
2890 | * afford to wait for the grace period before pushing data or else the | |
2891 | * data pending feature can race between the unregistration and stop | |
2892 | * command where the data pending command is sent *before* the grace | |
2893 | * period ended. | |
2894 | * | |
2895 | * The close metadata below nullifies the metadata pointer in the | |
2896 | * session so the delete session will NOT push/close a second time. | |
2897 | */ | |
7972aab2 | 2898 | registry = get_session_registry(ua_sess); |
1b532a60 | 2899 | if (registry && !registry->metadata_closed) { |
7972aab2 DG |
2900 | /* Push metadata for application before freeing the application. */ |
2901 | (void) push_metadata(registry, ua_sess->consumer); | |
2902 | ||
2903 | /* | |
2904 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
2905 | * metadata only on destroy trace session in this case. Also, the |
2906 | * previous push metadata could have flag the metadata registry to | |
2907 | * close so don't send a close command if closed. | |
7972aab2 | 2908 | */ |
1b532a60 DG |
2909 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID && |
2910 | !registry->metadata_closed) { | |
7972aab2 DG |
2911 | /* And ask to close it for this session registry. */ |
2912 | (void) close_metadata(registry, ua_sess->consumer); | |
2913 | } | |
2914 | } | |
d88aee68 | 2915 | |
d42f20df | 2916 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
d88aee68 | 2917 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
2918 | } |
2919 | ||
852d0037 DG |
2920 | /* Free memory */ |
2921 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
2922 | ||
5b4a0ec0 DG |
2923 | rcu_read_unlock(); |
2924 | return; | |
284d8f55 DG |
2925 | } |
2926 | ||
2927 | /* | |
5b4a0ec0 | 2928 | * Return traceable_app_count |
284d8f55 | 2929 | */ |
5b4a0ec0 | 2930 | unsigned long ust_app_list_count(void) |
284d8f55 | 2931 | { |
5b4a0ec0 | 2932 | unsigned long count; |
284d8f55 | 2933 | |
5b4a0ec0 | 2934 | rcu_read_lock(); |
bec39940 | 2935 | count = lttng_ht_get_count(ust_app_ht); |
5b4a0ec0 | 2936 | rcu_read_unlock(); |
284d8f55 | 2937 | |
5b4a0ec0 | 2938 | return count; |
284d8f55 DG |
2939 | } |
2940 | ||
5b4a0ec0 DG |
2941 | /* |
2942 | * Fill events array with all events name of all registered apps. | |
2943 | */ | |
2944 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 2945 | { |
5b4a0ec0 DG |
2946 | int ret, handle; |
2947 | size_t nbmem, count = 0; | |
bec39940 | 2948 | struct lttng_ht_iter iter; |
5b4a0ec0 | 2949 | struct ust_app *app; |
c617c0c6 | 2950 | struct lttng_event *tmp_event; |
421cb601 | 2951 | |
5b4a0ec0 | 2952 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
2953 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
2954 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
2955 | PERROR("zmalloc ust app events"); |
2956 | ret = -ENOMEM; | |
421cb601 DG |
2957 | goto error; |
2958 | } | |
2959 | ||
5b4a0ec0 | 2960 | rcu_read_lock(); |
421cb601 | 2961 | |
852d0037 | 2962 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 2963 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 2964 | |
840cb59c | 2965 | health_code_update(); |
86acf0da | 2966 | |
e0c7ec2b DG |
2967 | if (!app->compatible) { |
2968 | /* | |
2969 | * TODO: In time, we should notice the caller of this error by | |
2970 | * telling him that this is a version error. | |
2971 | */ | |
2972 | continue; | |
2973 | } | |
852d0037 | 2974 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 2975 | if (handle < 0) { |
ffe60014 DG |
2976 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
2977 | ERR("UST app list events getting handle failed for app pid %d", | |
2978 | app->pid); | |
2979 | } | |
5b4a0ec0 DG |
2980 | continue; |
2981 | } | |
421cb601 | 2982 | |
852d0037 | 2983 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 2984 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
2985 | /* Handle ustctl error. */ |
2986 | if (ret < 0) { | |
2987 | free(tmp_event); | |
2988 | if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) { | |
2989 | ERR("UST app tp list get failed for app %d with ret %d", | |
2990 | app->sock, ret); | |
2991 | } else { | |
2992 | DBG3("UST app tp list get failed. Application is dead"); | |
2993 | } | |
2994 | goto rcu_error; | |
2995 | } | |
2996 | ||
840cb59c | 2997 | health_code_update(); |
815564d8 | 2998 | if (count >= nbmem) { |
d7b3776f | 2999 | /* In case the realloc fails, we free the memory */ |
c617c0c6 MD |
3000 | void *ptr; |
3001 | ||
815564d8 MD |
3002 | DBG2("Reallocating event list from %zu to %zu entries", nbmem, |
3003 | 2 * nbmem); | |
3004 | nbmem *= 2; | |
c617c0c6 MD |
3005 | ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event)); |
3006 | if (ptr == NULL) { | |
5b4a0ec0 | 3007 | PERROR("realloc ust app events"); |
c617c0c6 | 3008 | free(tmp_event); |
5b4a0ec0 DG |
3009 | ret = -ENOMEM; |
3010 | goto rcu_error; | |
3011 | } | |
c617c0c6 | 3012 | tmp_event = ptr; |
5b4a0ec0 | 3013 | } |
c617c0c6 MD |
3014 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
3015 | tmp_event[count].loglevel = uiter.loglevel; | |
3016 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
3017 | tmp_event[count].pid = app->pid; | |
3018 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 3019 | count++; |
421cb601 | 3020 | } |
421cb601 DG |
3021 | } |
3022 | ||
5b4a0ec0 | 3023 | ret = count; |
c617c0c6 | 3024 | *events = tmp_event; |
421cb601 | 3025 | |
5b4a0ec0 | 3026 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 3027 | |
5b4a0ec0 DG |
3028 | rcu_error: |
3029 | rcu_read_unlock(); | |
421cb601 | 3030 | error: |
840cb59c | 3031 | health_code_update(); |
5b4a0ec0 | 3032 | return ret; |
421cb601 DG |
3033 | } |
3034 | ||
f37d259d MD |
3035 | /* |
3036 | * Fill events array with all events name of all registered apps. | |
3037 | */ | |
3038 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
3039 | { | |
3040 | int ret, handle; | |
3041 | size_t nbmem, count = 0; | |
3042 | struct lttng_ht_iter iter; | |
3043 | struct ust_app *app; | |
c617c0c6 | 3044 | struct lttng_event_field *tmp_event; |
f37d259d MD |
3045 | |
3046 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
3047 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
3048 | if (tmp_event == NULL) { | |
f37d259d MD |
3049 | PERROR("zmalloc ust app event fields"); |
3050 | ret = -ENOMEM; | |
3051 | goto error; | |
3052 | } | |
3053 | ||
3054 | rcu_read_lock(); | |
3055 | ||
3056 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3057 | struct lttng_ust_field_iter uiter; | |
3058 | ||
840cb59c | 3059 | health_code_update(); |
86acf0da | 3060 | |
f37d259d MD |
3061 | if (!app->compatible) { |
3062 | /* | |
3063 | * TODO: In time, we should notice the caller of this error by | |
3064 | * telling him that this is a version error. | |
3065 | */ | |
3066 | continue; | |
3067 | } | |
3068 | handle = ustctl_tracepoint_field_list(app->sock); | |
3069 | if (handle < 0) { | |
ffe60014 DG |
3070 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3071 | ERR("UST app list field getting handle failed for app pid %d", | |
3072 | app->pid); | |
3073 | } | |
f37d259d MD |
3074 | continue; |
3075 | } | |
3076 | ||
3077 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 3078 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3079 | /* Handle ustctl error. */ |
3080 | if (ret < 0) { | |
3081 | free(tmp_event); | |
3082 | if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) { | |
3083 | ERR("UST app tp list field failed for app %d with ret %d", | |
3084 | app->sock, ret); | |
3085 | } else { | |
3086 | DBG3("UST app tp list field failed. Application is dead"); | |
3087 | } | |
3088 | goto rcu_error; | |
3089 | } | |
3090 | ||
840cb59c | 3091 | health_code_update(); |
f37d259d | 3092 | if (count >= nbmem) { |
d7b3776f | 3093 | /* In case the realloc fails, we free the memory */ |
c617c0c6 MD |
3094 | void *ptr; |
3095 | ||
f37d259d MD |
3096 | DBG2("Reallocating event field list from %zu to %zu entries", nbmem, |
3097 | 2 * nbmem); | |
3098 | nbmem *= 2; | |
c617c0c6 MD |
3099 | ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event_field)); |
3100 | if (ptr == NULL) { | |
f37d259d | 3101 | PERROR("realloc ust app event fields"); |
c617c0c6 | 3102 | free(tmp_event); |
f37d259d MD |
3103 | ret = -ENOMEM; |
3104 | goto rcu_error; | |
3105 | } | |
c617c0c6 | 3106 | tmp_event = ptr; |
f37d259d | 3107 | } |
f37d259d | 3108 | |
c617c0c6 MD |
3109 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
3110 | tmp_event[count].type = uiter.type; | |
3111 | tmp_event[count].nowrite = uiter.nowrite; | |
f37d259d | 3112 | |
c617c0c6 MD |
3113 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
3114 | tmp_event[count].event.loglevel = uiter.loglevel; | |
3115 | tmp_event[count].event.type = LTTNG_UST_TRACEPOINT; | |
3116 | tmp_event[count].event.pid = app->pid; | |
3117 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
3118 | count++; |
3119 | } | |
3120 | } | |
3121 | ||
3122 | ret = count; | |
c617c0c6 | 3123 | *fields = tmp_event; |
f37d259d MD |
3124 | |
3125 | DBG2("UST app list event fields done (%zu events)", count); | |
3126 | ||
3127 | rcu_error: | |
3128 | rcu_read_unlock(); | |
3129 | error: | |
840cb59c | 3130 | health_code_update(); |
f37d259d MD |
3131 | return ret; |
3132 | } | |
3133 | ||
5b4a0ec0 DG |
3134 | /* |
3135 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
3136 | * |
3137 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
3138 | */ |
3139 | void ust_app_clean_list(void) | |
421cb601 | 3140 | { |
5b4a0ec0 | 3141 | int ret; |
659ed79f | 3142 | struct ust_app *app; |
bec39940 | 3143 | struct lttng_ht_iter iter; |
421cb601 | 3144 | |
5b4a0ec0 | 3145 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3146 | |
5b4a0ec0 | 3147 | rcu_read_lock(); |
421cb601 | 3148 | |
659ed79f | 3149 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3150 | ret = lttng_ht_del(ust_app_ht, &iter); |
525b0740 | 3151 | assert(!ret); |
659ed79f | 3152 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); |
421cb601 DG |
3153 | } |
3154 | ||
852d0037 | 3155 | /* Cleanup socket hash table */ |
659ed79f DG |
3156 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, |
3157 | sock_n.node) { | |
852d0037 | 3158 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
bec39940 DG |
3159 | assert(!ret); |
3160 | } | |
852d0037 | 3161 | |
d88aee68 DG |
3162 | /* Cleanup notify socket hash table */ |
3163 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3164 | notify_sock_n.node) { | |
3165 | ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3166 | assert(!ret); | |
3167 | } | |
36b588ed | 3168 | rcu_read_unlock(); |
d88aee68 | 3169 | |
bec39940 | 3170 | /* Destroy is done only when the ht is empty */ |
0b2dc8df MD |
3171 | ht_cleanup_push(ust_app_ht); |
3172 | ht_cleanup_push(ust_app_ht_by_sock); | |
3173 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
5b4a0ec0 DG |
3174 | } |
3175 | ||
3176 | /* | |
3177 | * Init UST app hash table. | |
3178 | */ | |
3179 | void ust_app_ht_alloc(void) | |
3180 | { | |
bec39940 | 3181 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
852d0037 | 3182 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3183 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
421cb601 DG |
3184 | } |
3185 | ||
78f0bacd DG |
3186 | /* |
3187 | * For a specific UST session, disable the channel for all registered apps. | |
3188 | */ | |
35a9059d | 3189 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3190 | struct ltt_ust_channel *uchan) |
3191 | { | |
3192 | int ret = 0; | |
bec39940 DG |
3193 | struct lttng_ht_iter iter; |
3194 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3195 | struct ust_app *app; |
3196 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3197 | struct ust_app_channel *ua_chan; |
78f0bacd DG |
3198 | |
3199 | if (usess == NULL || uchan == NULL) { | |
3200 | ERR("Disabling UST global channel with NULL values"); | |
3201 | ret = -1; | |
3202 | goto error; | |
3203 | } | |
3204 | ||
77c5447b | 3205 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 3206 | uchan->name, usess->id); |
78f0bacd DG |
3207 | |
3208 | rcu_read_lock(); | |
3209 | ||
3210 | /* For every registered applications */ | |
852d0037 | 3211 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3212 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3213 | if (!app->compatible) { |
3214 | /* | |
3215 | * TODO: In time, we should notice the caller of this error by | |
3216 | * telling him that this is a version error. | |
3217 | */ | |
3218 | continue; | |
3219 | } | |
78f0bacd DG |
3220 | ua_sess = lookup_session_by_app(usess, app); |
3221 | if (ua_sess == NULL) { | |
3222 | continue; | |
3223 | } | |
3224 | ||
8535a6d9 | 3225 | /* Get channel */ |
bec39940 DG |
3226 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3227 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
3228 | /* If the session if found for the app, the channel must be there */ |
3229 | assert(ua_chan_node); | |
3230 | ||
3231 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3232 | /* The channel must not be already disabled */ | |
3233 | assert(ua_chan->enabled == 1); | |
3234 | ||
3235 | /* Disable channel onto application */ | |
3236 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
3237 | if (ret < 0) { |
3238 | /* XXX: We might want to report this error at some point... */ | |
3239 | continue; | |
3240 | } | |
3241 | } | |
3242 | ||
3243 | rcu_read_unlock(); | |
3244 | ||
3245 | error: | |
3246 | return ret; | |
3247 | } | |
3248 | ||
3249 | /* | |
3250 | * For a specific UST session, enable the channel for all registered apps. | |
3251 | */ | |
35a9059d | 3252 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3253 | struct ltt_ust_channel *uchan) |
3254 | { | |
3255 | int ret = 0; | |
bec39940 | 3256 | struct lttng_ht_iter iter; |
78f0bacd DG |
3257 | struct ust_app *app; |
3258 | struct ust_app_session *ua_sess; | |
3259 | ||
3260 | if (usess == NULL || uchan == NULL) { | |
3261 | ERR("Adding UST global channel to NULL values"); | |
3262 | ret = -1; | |
3263 | goto error; | |
3264 | } | |
3265 | ||
77c5447b | 3266 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 3267 | uchan->name, usess->id); |
78f0bacd DG |
3268 | |
3269 | rcu_read_lock(); | |
3270 | ||
3271 | /* For every registered applications */ | |
852d0037 | 3272 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3273 | if (!app->compatible) { |
3274 | /* | |
3275 | * TODO: In time, we should notice the caller of this error by | |
3276 | * telling him that this is a version error. | |
3277 | */ | |
3278 | continue; | |
3279 | } | |
78f0bacd DG |
3280 | ua_sess = lookup_session_by_app(usess, app); |
3281 | if (ua_sess == NULL) { | |
3282 | continue; | |
3283 | } | |
3284 | ||
3285 | /* Enable channel onto application */ | |
3286 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
3287 | if (ret < 0) { | |
3288 | /* XXX: We might want to report this error at some point... */ | |
3289 | continue; | |
3290 | } | |
3291 | } | |
3292 | ||
3293 | rcu_read_unlock(); | |
3294 | ||
3295 | error: | |
3296 | return ret; | |
3297 | } | |
3298 | ||
b0a40d28 DG |
3299 | /* |
3300 | * Disable an event in a channel and for a specific session. | |
3301 | */ | |
35a9059d DG |
3302 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
3303 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
3304 | { |
3305 | int ret = 0; | |
bec39940 DG |
3306 | struct lttng_ht_iter iter, uiter; |
3307 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
b0a40d28 DG |
3308 | struct ust_app *app; |
3309 | struct ust_app_session *ua_sess; | |
3310 | struct ust_app_channel *ua_chan; | |
3311 | struct ust_app_event *ua_event; | |
3312 | ||
3313 | DBG("UST app disabling event %s for all apps in channel " | |
77c5447b MD |
3314 | "%s for session id %" PRIu64, |
3315 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
3316 | |
3317 | rcu_read_lock(); | |
3318 | ||
3319 | /* For all registered applications */ | |
852d0037 | 3320 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3321 | if (!app->compatible) { |
3322 | /* | |
3323 | * TODO: In time, we should notice the caller of this error by | |
3324 | * telling him that this is a version error. | |
3325 | */ | |
3326 | continue; | |
3327 | } | |
b0a40d28 DG |
3328 | ua_sess = lookup_session_by_app(usess, app); |
3329 | if (ua_sess == NULL) { | |
3330 | /* Next app */ | |
3331 | continue; | |
3332 | } | |
3333 | ||
3334 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3335 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3336 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 3337 | if (ua_chan_node == NULL) { |
77c5447b | 3338 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 3339 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
3340 | continue; |
3341 | } | |
3342 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3343 | ||
bec39940 DG |
3344 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter); |
3345 | ua_event_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 DG |
3346 | if (ua_event_node == NULL) { |
3347 | DBG2("Event %s not found in channel %s for app pid %d." | |
852d0037 | 3348 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
3349 | continue; |
3350 | } | |
3351 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
3352 | ||
7f79d3a1 | 3353 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
3354 | if (ret < 0) { |
3355 | /* XXX: Report error someday... */ | |
3356 | continue; | |
3357 | } | |
3358 | } | |
3359 | ||
3360 | rcu_read_unlock(); | |
3361 | ||
3362 | return ret; | |
3363 | } | |
3364 | ||
9730260e | 3365 | /* |
edb67388 | 3366 | * For a specific UST session and UST channel, the event for all |
9730260e DG |
3367 | * registered apps. |
3368 | */ | |
35a9059d | 3369 | int ust_app_disable_all_event_glb(struct ltt_ust_session *usess, |
9730260e DG |
3370 | struct ltt_ust_channel *uchan) |
3371 | { | |
3372 | int ret = 0; | |
bec39940 DG |
3373 | struct lttng_ht_iter iter, uiter; |
3374 | struct lttng_ht_node_str *ua_chan_node; | |
9730260e DG |
3375 | struct ust_app *app; |
3376 | struct ust_app_session *ua_sess; | |
3377 | struct ust_app_channel *ua_chan; | |
3378 | struct ust_app_event *ua_event; | |
3379 | ||
3380 | DBG("UST app disabling all event for all apps in channel " | |
77c5447b | 3381 | "%s for session id %" PRIu64, uchan->name, usess->id); |
9730260e DG |
3382 | |
3383 | rcu_read_lock(); | |
3384 | ||
3385 | /* For all registered applications */ | |
852d0037 | 3386 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3387 | if (!app->compatible) { |
3388 | /* | |
3389 | * TODO: In time, we should notice the caller of this error by | |
3390 | * telling him that this is a version error. | |
3391 | */ | |
3392 | continue; | |
3393 | } | |
9730260e | 3394 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3395 | if (!ua_sess) { |
3396 | /* The application has problem or is probably dead. */ | |
3397 | continue; | |
3398 | } | |
9730260e DG |
3399 | |
3400 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3401 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3402 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3403 | /* If the channel is not found, there is a code flow error */ |
3404 | assert(ua_chan_node); | |
3405 | ||
9730260e DG |
3406 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3407 | ||
3408 | /* Disable each events of channel */ | |
bec39940 DG |
3409 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
3410 | node.node) { | |
7f79d3a1 | 3411 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
9730260e DG |
3412 | if (ret < 0) { |
3413 | /* XXX: Report error someday... */ | |
3414 | continue; | |
3415 | } | |
3416 | } | |
3417 | } | |
3418 | ||
3419 | rcu_read_unlock(); | |
3420 | ||
3421 | return ret; | |
3422 | } | |
3423 | ||
421cb601 | 3424 | /* |
5b4a0ec0 | 3425 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 3426 | */ |
35a9059d | 3427 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3428 | struct ltt_ust_channel *uchan) |
3429 | { | |
3d8ca23b | 3430 | int ret = 0, created; |
bec39940 | 3431 | struct lttng_ht_iter iter; |
48842b30 | 3432 | struct ust_app *app; |
3d8ca23b | 3433 | struct ust_app_session *ua_sess = NULL; |
48842b30 | 3434 | |
fc34caaa DG |
3435 | /* Very wrong code flow */ |
3436 | assert(usess); | |
3437 | assert(uchan); | |
421cb601 | 3438 | |
77c5447b | 3439 | DBG2("UST app adding channel %s to UST domain for session id %" PRIu64, |
a991f516 | 3440 | uchan->name, usess->id); |
48842b30 DG |
3441 | |
3442 | rcu_read_lock(); | |
421cb601 | 3443 | |
5b4a0ec0 | 3444 | /* For every registered applications */ |
852d0037 | 3445 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3446 | if (!app->compatible) { |
3447 | /* | |
3448 | * TODO: In time, we should notice the caller of this error by | |
3449 | * telling him that this is a version error. | |
3450 | */ | |
3451 | continue; | |
3452 | } | |
edb67388 DG |
3453 | /* |
3454 | * Create session on the tracer side and add it to app session HT. Note | |
3455 | * that if session exist, it will simply return a pointer to the ust | |
3456 | * app session. | |
3457 | */ | |
3d8ca23b DG |
3458 | ret = create_ust_app_session(usess, app, &ua_sess, &created); |
3459 | if (ret < 0) { | |
3460 | switch (ret) { | |
3461 | case -ENOTCONN: | |
3462 | /* | |
3463 | * The application's socket is not valid. Either a bad socket | |
3464 | * or a timeout on it. We can't inform the caller that for a | |
3465 | * specific app, the session failed so lets continue here. | |
3466 | */ | |
3467 | continue; | |
3468 | case -ENOMEM: | |
3469 | default: | |
3470 | goto error_rcu_unlock; | |
3471 | } | |
48842b30 | 3472 | } |
3d8ca23b | 3473 | assert(ua_sess); |
48842b30 | 3474 | |
d0b96690 | 3475 | pthread_mutex_lock(&ua_sess->lock); |
d65d2de8 DG |
3476 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, |
3477 | sizeof(uchan->name))) { | |
3478 | struct ustctl_consumer_channel_attr attr; | |
3479 | copy_channel_attr_to_ustctl(&attr, &uchan->attr); | |
3480 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, | |
3481 | &attr); | |
3482 | } else { | |
3483 | /* Create channel onto application. We don't need the chan ref. */ | |
3484 | ret = create_ust_app_channel(ua_sess, uchan, app, | |
3485 | LTTNG_UST_CHAN_PER_CPU, usess, NULL); | |
3486 | } | |
d0b96690 | 3487 | pthread_mutex_unlock(&ua_sess->lock); |
3d8ca23b DG |
3488 | if (ret < 0) { |
3489 | if (ret == -ENOMEM) { | |
3490 | /* No more memory is a fatal error. Stop right now. */ | |
3491 | goto error_rcu_unlock; | |
3492 | } | |
3493 | /* Cleanup the created session if it's the case. */ | |
3494 | if (created) { | |
d0b96690 | 3495 | destroy_app_session(app, ua_sess); |
3d8ca23b | 3496 | } |
48842b30 | 3497 | } |
48842b30 | 3498 | } |
5b4a0ec0 | 3499 | |
95e047ff | 3500 | error_rcu_unlock: |
48842b30 | 3501 | rcu_read_unlock(); |
3c14c33f | 3502 | return ret; |
48842b30 DG |
3503 | } |
3504 | ||
5b4a0ec0 | 3505 | /* |
edb67388 | 3506 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 3507 | */ |
35a9059d | 3508 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3509 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3510 | { | |
3511 | int ret = 0; | |
bec39940 | 3512 | struct lttng_ht_iter iter, uiter; |
18eace3b | 3513 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
3514 | struct ust_app *app; |
3515 | struct ust_app_session *ua_sess; | |
3516 | struct ust_app_channel *ua_chan; | |
3517 | struct ust_app_event *ua_event; | |
48842b30 | 3518 | |
77c5447b | 3519 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 3520 | uevent->attr.name, usess->id); |
48842b30 | 3521 | |
edb67388 DG |
3522 | /* |
3523 | * NOTE: At this point, this function is called only if the session and | |
3524 | * channel passed are already created for all apps. and enabled on the | |
3525 | * tracer also. | |
3526 | */ | |
3527 | ||
48842b30 | 3528 | rcu_read_lock(); |
421cb601 DG |
3529 | |
3530 | /* For all registered applications */ | |
852d0037 | 3531 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3532 | if (!app->compatible) { |
3533 | /* | |
3534 | * TODO: In time, we should notice the caller of this error by | |
3535 | * telling him that this is a version error. | |
3536 | */ | |
3537 | continue; | |
3538 | } | |
edb67388 | 3539 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3540 | if (!ua_sess) { |
3541 | /* The application has problem or is probably dead. */ | |
3542 | continue; | |
3543 | } | |
ba767faf | 3544 | |
d0b96690 DG |
3545 | pthread_mutex_lock(&ua_sess->lock); |
3546 | ||
edb67388 | 3547 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3548 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3549 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3550 | /* If the channel is not found, there is a code flow error */ |
3551 | assert(ua_chan_node); | |
3552 | ||
3553 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3554 | ||
18eace3b DG |
3555 | /* Get event node */ |
3556 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
3557 | uevent->filter, uevent->attr.loglevel); | |
3558 | if (ua_event == NULL) { | |
7f79d3a1 | 3559 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 3560 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 3561 | goto next_app; |
35a9059d | 3562 | } |
35a9059d DG |
3563 | |
3564 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
3565 | if (ret < 0) { | |
d0b96690 | 3566 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 3567 | goto error; |
48842b30 | 3568 | } |
d0b96690 DG |
3569 | next_app: |
3570 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
3571 | } |
3572 | ||
7f79d3a1 | 3573 | error: |
edb67388 | 3574 | rcu_read_unlock(); |
edb67388 DG |
3575 | return ret; |
3576 | } | |
3577 | ||
3578 | /* | |
3579 | * For a specific existing UST session and UST channel, creates the event for | |
3580 | * all registered apps. | |
3581 | */ | |
35a9059d | 3582 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
3583 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3584 | { | |
3585 | int ret = 0; | |
bec39940 DG |
3586 | struct lttng_ht_iter iter, uiter; |
3587 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
3588 | struct ust_app *app; |
3589 | struct ust_app_session *ua_sess; | |
3590 | struct ust_app_channel *ua_chan; | |
3591 | ||
77c5447b | 3592 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 3593 | uevent->attr.name, usess->id); |
edb67388 | 3594 | |
edb67388 DG |
3595 | rcu_read_lock(); |
3596 | ||
3597 | /* For all registered applications */ | |
852d0037 | 3598 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3599 | if (!app->compatible) { |
3600 | /* | |
3601 | * TODO: In time, we should notice the caller of this error by | |
3602 | * telling him that this is a version error. | |
3603 | */ | |
3604 | continue; | |
3605 | } | |
edb67388 | 3606 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3607 | if (!ua_sess) { |
3608 | /* The application has problem or is probably dead. */ | |
3609 | continue; | |
3610 | } | |
48842b30 | 3611 | |
d0b96690 | 3612 | pthread_mutex_lock(&ua_sess->lock); |
48842b30 | 3613 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3614 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3615 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3616 | /* If the channel is not found, there is a code flow error */ |
3617 | assert(ua_chan_node); | |
3618 | ||
48842b30 DG |
3619 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3620 | ||
edb67388 | 3621 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 3622 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 3623 | if (ret < 0) { |
49c336c1 | 3624 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
3625 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
3626 | break; | |
3627 | } | |
3628 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 3629 | uevent->attr.name, app->pid); |
5b4a0ec0 | 3630 | continue; |
48842b30 | 3631 | } |
48842b30 | 3632 | } |
5b4a0ec0 | 3633 | |
48842b30 DG |
3634 | rcu_read_unlock(); |
3635 | ||
3636 | return ret; | |
3637 | } | |
3638 | ||
5b4a0ec0 DG |
3639 | /* |
3640 | * Start tracing for a specific UST session and app. | |
3641 | */ | |
b34cbebf | 3642 | static |
421cb601 | 3643 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
3644 | { |
3645 | int ret = 0; | |
48842b30 | 3646 | struct ust_app_session *ua_sess; |
48842b30 | 3647 | |
852d0037 | 3648 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 3649 | |
509cbaf8 MD |
3650 | rcu_read_lock(); |
3651 | ||
e0c7ec2b DG |
3652 | if (!app->compatible) { |
3653 | goto end; | |
3654 | } | |
3655 | ||
421cb601 DG |
3656 | ua_sess = lookup_session_by_app(usess, app); |
3657 | if (ua_sess == NULL) { | |
d42f20df DG |
3658 | /* The session is in teardown process. Ignore and continue. */ |
3659 | goto end; | |
421cb601 | 3660 | } |
48842b30 | 3661 | |
d0b96690 DG |
3662 | pthread_mutex_lock(&ua_sess->lock); |
3663 | ||
aea829b3 DG |
3664 | /* Upon restart, we skip the setup, already done */ |
3665 | if (ua_sess->started) { | |
8be98f9a | 3666 | goto skip_setup; |
aea829b3 | 3667 | } |
8be98f9a | 3668 | |
a4b92340 DG |
3669 | /* Create directories if consumer is LOCAL and has a path defined. */ |
3670 | if (usess->consumer->type == CONSUMER_DST_LOCAL && | |
3671 | strlen(usess->consumer->dst.trace_path) > 0) { | |
3672 | ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path, | |
7972aab2 | 3673 | S_IRWXU | S_IRWXG, ua_sess->euid, ua_sess->egid); |
a4b92340 DG |
3674 | if (ret < 0) { |
3675 | if (ret != -EEXIST) { | |
3676 | ERR("Trace directory creation error"); | |
d0b96690 | 3677 | goto error_unlock; |
421cb601 | 3678 | } |
173af62f | 3679 | } |
7753dea8 | 3680 | } |
aea829b3 | 3681 | |
d65d2de8 DG |
3682 | /* |
3683 | * Create the metadata for the application. This returns gracefully if a | |
3684 | * metadata was already set for the session. | |
3685 | */ | |
3686 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, NULL); | |
421cb601 | 3687 | if (ret < 0) { |
d0b96690 | 3688 | goto error_unlock; |
421cb601 | 3689 | } |
48842b30 | 3690 | |
840cb59c | 3691 | health_code_update(); |
86acf0da | 3692 | |
8be98f9a | 3693 | skip_setup: |
421cb601 | 3694 | /* This start the UST tracing */ |
852d0037 | 3695 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
421cb601 | 3696 | if (ret < 0) { |
ffe60014 DG |
3697 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3698 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
3699 | app->pid, ret); | |
3700 | } else { | |
3701 | DBG("UST app start session failed. Application is dead."); | |
3702 | } | |
d0b96690 | 3703 | goto error_unlock; |
421cb601 | 3704 | } |
5b4a0ec0 | 3705 | |
55c3953d DG |
3706 | /* Indicate that the session has been started once */ |
3707 | ua_sess->started = 1; | |
3708 | ||
d0b96690 DG |
3709 | pthread_mutex_unlock(&ua_sess->lock); |
3710 | ||
840cb59c | 3711 | health_code_update(); |
86acf0da | 3712 | |
421cb601 | 3713 | /* Quiescent wait after starting trace */ |
ffe60014 DG |
3714 | ret = ustctl_wait_quiescent(app->sock); |
3715 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3716 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3717 | app->pid, ret); | |
3718 | } | |
48842b30 | 3719 | |
e0c7ec2b DG |
3720 | end: |
3721 | rcu_read_unlock(); | |
840cb59c | 3722 | health_code_update(); |
421cb601 | 3723 | return 0; |
48842b30 | 3724 | |
d0b96690 DG |
3725 | error_unlock: |
3726 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 3727 | rcu_read_unlock(); |
840cb59c | 3728 | health_code_update(); |
421cb601 DG |
3729 | return -1; |
3730 | } | |
48842b30 | 3731 | |
8be98f9a MD |
3732 | /* |
3733 | * Stop tracing for a specific UST session and app. | |
3734 | */ | |
b34cbebf | 3735 | static |
8be98f9a MD |
3736 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
3737 | { | |
3738 | int ret = 0; | |
3739 | struct ust_app_session *ua_sess; | |
7972aab2 | 3740 | struct ust_registry_session *registry; |
8be98f9a | 3741 | |
852d0037 | 3742 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
3743 | |
3744 | rcu_read_lock(); | |
3745 | ||
e0c7ec2b | 3746 | if (!app->compatible) { |
d88aee68 | 3747 | goto end_no_session; |
e0c7ec2b DG |
3748 | } |
3749 | ||
8be98f9a MD |
3750 | ua_sess = lookup_session_by_app(usess, app); |
3751 | if (ua_sess == NULL) { | |
d88aee68 | 3752 | goto end_no_session; |
8be98f9a MD |
3753 | } |
3754 | ||
d88aee68 DG |
3755 | pthread_mutex_lock(&ua_sess->lock); |
3756 | ||
9bc07046 DG |
3757 | /* |
3758 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
3759 | * that was never started. It's possible since we can have a fail start |
3760 | * from either the application manager thread or the command thread. Simply | |
3761 | * indicate that this is a stop error. | |
9bc07046 | 3762 | */ |
f9dfc3d9 | 3763 | if (!ua_sess->started) { |
c45536e1 DG |
3764 | goto error_rcu_unlock; |
3765 | } | |
7db205b5 | 3766 | |
840cb59c | 3767 | health_code_update(); |
86acf0da | 3768 | |
9d6c7d3f | 3769 | /* This inhibits UST tracing */ |
852d0037 | 3770 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
9d6c7d3f | 3771 | if (ret < 0) { |
ffe60014 DG |
3772 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3773 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
3774 | app->pid, ret); | |
3775 | } else { | |
3776 | DBG("UST app stop session failed. Application is dead."); | |
3777 | } | |
9d6c7d3f DG |
3778 | goto error_rcu_unlock; |
3779 | } | |
3780 | ||
840cb59c | 3781 | health_code_update(); |
86acf0da | 3782 | |
9d6c7d3f | 3783 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
3784 | ret = ustctl_wait_quiescent(app->sock); |
3785 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3786 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3787 | app->pid, ret); | |
3788 | } | |
9d6c7d3f | 3789 | |
840cb59c | 3790 | health_code_update(); |
86acf0da | 3791 | |
b34cbebf MD |
3792 | registry = get_session_registry(ua_sess); |
3793 | assert(registry); | |
1b532a60 DG |
3794 | |
3795 | if (!registry->metadata_closed) { | |
3796 | /* Push metadata for application before freeing the application. */ | |
3797 | (void) push_metadata(registry, ua_sess->consumer); | |
3798 | } | |
b34cbebf MD |
3799 | |
3800 | pthread_mutex_unlock(&ua_sess->lock); | |
3801 | end_no_session: | |
3802 | rcu_read_unlock(); | |
3803 | health_code_update(); | |
3804 | return 0; | |
3805 | ||
3806 | error_rcu_unlock: | |
3807 | pthread_mutex_unlock(&ua_sess->lock); | |
3808 | rcu_read_unlock(); | |
3809 | health_code_update(); | |
3810 | return -1; | |
3811 | } | |
3812 | ||
3813 | /* | |
3814 | * Flush buffers for a specific UST session and app. | |
3815 | */ | |
3816 | static | |
3817 | int ust_app_flush_trace(struct ltt_ust_session *usess, struct ust_app *app) | |
3818 | { | |
3819 | int ret = 0; | |
3820 | struct lttng_ht_iter iter; | |
3821 | struct ust_app_session *ua_sess; | |
3822 | struct ust_app_channel *ua_chan; | |
3823 | ||
3824 | DBG("Flushing buffers for ust app pid %d", app->pid); | |
3825 | ||
3826 | rcu_read_lock(); | |
3827 | ||
3828 | if (!app->compatible) { | |
3829 | goto end_no_session; | |
3830 | } | |
3831 | ||
3832 | ua_sess = lookup_session_by_app(usess, app); | |
3833 | if (ua_sess == NULL) { | |
3834 | goto end_no_session; | |
3835 | } | |
3836 | ||
3837 | pthread_mutex_lock(&ua_sess->lock); | |
3838 | ||
3839 | health_code_update(); | |
3840 | ||
9d6c7d3f | 3841 | /* Flushing buffers */ |
bec39940 DG |
3842 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
3843 | node.node) { | |
840cb59c | 3844 | health_code_update(); |
ffe60014 | 3845 | assert(ua_chan->is_sent); |
852d0037 | 3846 | ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj); |
8be98f9a | 3847 | if (ret < 0) { |
ffe60014 DG |
3848 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3849 | ERR("UST app PID %d channel %s flush failed with ret %d", | |
3850 | app->pid, ua_chan->name, ret); | |
3851 | } else { | |
3852 | DBG3("UST app failed to flush %s. Application is dead.", | |
3853 | ua_chan->name); | |
3854 | /* No need to continue. */ | |
d88aee68 | 3855 | break; |
ffe60014 | 3856 | } |
6d3686da DG |
3857 | /* Continuing flushing all buffers */ |
3858 | continue; | |
8be98f9a MD |
3859 | } |
3860 | } | |
8be98f9a | 3861 | |
840cb59c | 3862 | health_code_update(); |
86acf0da | 3863 | |
d88aee68 DG |
3864 | pthread_mutex_unlock(&ua_sess->lock); |
3865 | end_no_session: | |
7db205b5 | 3866 | rcu_read_unlock(); |
840cb59c | 3867 | health_code_update(); |
8be98f9a | 3868 | return 0; |
8be98f9a MD |
3869 | } |
3870 | ||
84cd17c6 MD |
3871 | /* |
3872 | * Destroy a specific UST session in apps. | |
3873 | */ | |
3353de95 | 3874 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 3875 | { |
ffe60014 | 3876 | int ret; |
84cd17c6 | 3877 | struct ust_app_session *ua_sess; |
bec39940 | 3878 | struct lttng_ht_iter iter; |
77c5447b | 3879 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 3880 | |
852d0037 | 3881 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
3882 | |
3883 | rcu_read_lock(); | |
3884 | ||
e0c7ec2b DG |
3885 | if (!app->compatible) { |
3886 | goto end; | |
3887 | } | |
3888 | ||
84cd17c6 | 3889 | __lookup_session_by_app(usess, app, &iter); |
77c5447b | 3890 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 3891 | if (node == NULL) { |
d42f20df DG |
3892 | /* Session is being or is deleted. */ |
3893 | goto end; | |
84cd17c6 MD |
3894 | } |
3895 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 3896 | |
840cb59c | 3897 | health_code_update(); |
d0b96690 | 3898 | destroy_app_session(app, ua_sess); |
84cd17c6 | 3899 | |
840cb59c | 3900 | health_code_update(); |
7db205b5 | 3901 | |
84cd17c6 | 3902 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
3903 | ret = ustctl_wait_quiescent(app->sock); |
3904 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3905 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3906 | app->pid, ret); | |
3907 | } | |
e0c7ec2b DG |
3908 | end: |
3909 | rcu_read_unlock(); | |
840cb59c | 3910 | health_code_update(); |
84cd17c6 | 3911 | return 0; |
84cd17c6 MD |
3912 | } |
3913 | ||
5b4a0ec0 DG |
3914 | /* |
3915 | * Start tracing for the UST session. | |
3916 | */ | |
421cb601 DG |
3917 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
3918 | { | |
3919 | int ret = 0; | |
bec39940 | 3920 | struct lttng_ht_iter iter; |
421cb601 | 3921 | struct ust_app *app; |
48842b30 | 3922 | |
421cb601 DG |
3923 | DBG("Starting all UST traces"); |
3924 | ||
3925 | rcu_read_lock(); | |
421cb601 | 3926 | |
852d0037 | 3927 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
421cb601 | 3928 | ret = ust_app_start_trace(usess, app); |
48842b30 | 3929 | if (ret < 0) { |
5b4a0ec0 DG |
3930 | /* Continue to next apps even on error */ |
3931 | continue; | |
48842b30 | 3932 | } |
48842b30 | 3933 | } |
5b4a0ec0 | 3934 | |
48842b30 DG |
3935 | rcu_read_unlock(); |
3936 | ||
3937 | return 0; | |
3938 | } | |
487cf67c | 3939 | |
8be98f9a MD |
3940 | /* |
3941 | * Start tracing for the UST session. | |
3942 | */ | |
3943 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
3944 | { | |
3945 | int ret = 0; | |
bec39940 | 3946 | struct lttng_ht_iter iter; |
8be98f9a MD |
3947 | struct ust_app *app; |
3948 | ||
3949 | DBG("Stopping all UST traces"); | |
3950 | ||
3951 | rcu_read_lock(); | |
3952 | ||
b34cbebf MD |
3953 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3954 | ret = ust_app_stop_trace(usess, app); | |
3955 | if (ret < 0) { | |
3956 | /* Continue to next apps even on error */ | |
3957 | continue; | |
3958 | } | |
3959 | } | |
3960 | ||
3961 | /* Flush buffers */ | |
3962 | switch (usess->buffer_type) { | |
3963 | case LTTNG_BUFFER_PER_UID: | |
3964 | { | |
7972aab2 | 3965 | struct buffer_reg_uid *reg; |
b34cbebf MD |
3966 | |
3967 | /* Flush all per UID buffers associated to that session. */ | |
7972aab2 DG |
3968 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
3969 | struct buffer_reg_channel *reg_chan; | |
3970 | struct consumer_socket *socket; | |
3971 | ||
3972 | /* Get consumer socket to use to push the metadata.*/ | |
3973 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
3974 | usess->consumer); | |
3975 | if (!socket) { | |
3976 | /* Ignore request if no consumer is found for the session. */ | |
3977 | continue; | |
3978 | } | |
3979 | ||
3980 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
3981 | reg_chan, node.node) { | |
3982 | /* | |
3983 | * The following call will print error values so the return | |
3984 | * code is of little importance because whatever happens, we | |
3985 | * have to try them all. | |
3986 | */ | |
3987 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
3988 | } | |
3989 | } | |
b34cbebf | 3990 | break; |
7972aab2 | 3991 | } |
b34cbebf MD |
3992 | case LTTNG_BUFFER_PER_PID: |
3993 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3994 | ret = ust_app_flush_trace(usess, app); | |
3995 | if (ret < 0) { | |
3996 | /* Continue to next apps even on error */ | |
3997 | continue; | |
3998 | } | |
8be98f9a | 3999 | } |
b34cbebf MD |
4000 | break; |
4001 | default: | |
4002 | assert(0); | |
4003 | break; | |
8be98f9a MD |
4004 | } |
4005 | ||
4006 | rcu_read_unlock(); | |
4007 | ||
4008 | return 0; | |
4009 | } | |
4010 | ||
84cd17c6 MD |
4011 | /* |
4012 | * Destroy app UST session. | |
4013 | */ | |
4014 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
4015 | { | |
4016 | int ret = 0; | |
bec39940 | 4017 | struct lttng_ht_iter iter; |
84cd17c6 MD |
4018 | struct ust_app *app; |
4019 | ||
4020 | DBG("Destroy all UST traces"); | |
4021 | ||
4022 | rcu_read_lock(); | |
4023 | ||
852d0037 | 4024 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 4025 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
4026 | if (ret < 0) { |
4027 | /* Continue to next apps even on error */ | |
4028 | continue; | |
4029 | } | |
4030 | } | |
4031 | ||
4032 | rcu_read_unlock(); | |
4033 | ||
4034 | return 0; | |
4035 | } | |
4036 | ||
5b4a0ec0 DG |
4037 | /* |
4038 | * Add channels/events from UST global domain to registered apps at sock. | |
4039 | */ | |
487cf67c DG |
4040 | void ust_app_global_update(struct ltt_ust_session *usess, int sock) |
4041 | { | |
55c54cce | 4042 | int ret = 0; |
727d5404 | 4043 | struct lttng_ht_iter iter, uiter, iter_ctx; |
487cf67c | 4044 | struct ust_app *app; |
3d8ca23b | 4045 | struct ust_app_session *ua_sess = NULL; |
487cf67c DG |
4046 | struct ust_app_channel *ua_chan; |
4047 | struct ust_app_event *ua_event; | |
727d5404 | 4048 | struct ust_app_ctx *ua_ctx; |
1f3580c7 | 4049 | |
95e047ff | 4050 | assert(usess); |
ffe60014 | 4051 | assert(sock >= 0); |
1f3580c7 | 4052 | |
77c5447b | 4053 | DBG2("UST app global update for app sock %d for session id %" PRIu64, sock, |
a991f516 | 4054 | usess->id); |
487cf67c | 4055 | |
284d8f55 DG |
4056 | rcu_read_lock(); |
4057 | ||
487cf67c DG |
4058 | app = find_app_by_sock(sock); |
4059 | if (app == NULL) { | |
d88aee68 DG |
4060 | /* |
4061 | * Application can be unregistered before so this is possible hence | |
4062 | * simply stopping the update. | |
4063 | */ | |
4064 | DBG3("UST app update failed to find app sock %d", sock); | |
487cf67c DG |
4065 | goto error; |
4066 | } | |
4067 | ||
e0c7ec2b DG |
4068 | if (!app->compatible) { |
4069 | goto error; | |
4070 | } | |
4071 | ||
3d8ca23b DG |
4072 | ret = create_ust_app_session(usess, app, &ua_sess, NULL); |
4073 | if (ret < 0) { | |
4074 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
4075 | goto error; |
4076 | } | |
3d8ca23b | 4077 | assert(ua_sess); |
487cf67c | 4078 | |
d0b96690 DG |
4079 | pthread_mutex_lock(&ua_sess->lock); |
4080 | ||
284d8f55 | 4081 | /* |
d0b96690 | 4082 | * We can iterate safely here over all UST app session since the create ust |
284d8f55 DG |
4083 | * app session above made a shadow copy of the UST global domain from the |
4084 | * ltt ust session. | |
4085 | */ | |
bec39940 DG |
4086 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
4087 | node.node) { | |
d65d2de8 DG |
4088 | /* |
4089 | * For a metadata channel, handle it differently. | |
4090 | */ | |
4091 | if (!strncmp(ua_chan->name, DEFAULT_METADATA_NAME, | |
4092 | sizeof(ua_chan->name))) { | |
4093 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, | |
4094 | &ua_chan->attr); | |
c7a339aa DG |
4095 | if (ret < 0) { |
4096 | goto error_unlock; | |
4097 | } | |
d65d2de8 DG |
4098 | /* Remove it from the hash table and continue!. */ |
4099 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
4100 | assert(!ret); | |
4101 | delete_ust_app_channel(-1, ua_chan, app); | |
4102 | continue; | |
4103 | } else { | |
4104 | ret = do_create_channel(app, usess, ua_sess, ua_chan); | |
c7a339aa DG |
4105 | if (ret < 0) { |
4106 | /* | |
4107 | * Stop everything. On error, the application failed, no more | |
4108 | * file descriptor are available or ENOMEM so stopping here is | |
4109 | * the only thing we can do for now. | |
4110 | */ | |
4111 | goto error_unlock; | |
4112 | } | |
487cf67c DG |
4113 | } |
4114 | ||
727d5404 DG |
4115 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter_ctx.iter, ua_ctx, |
4116 | node.node) { | |
4117 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
4118 | if (ret < 0) { | |
d0b96690 | 4119 | goto error_unlock; |
727d5404 DG |
4120 | } |
4121 | } | |
4122 | ||
4123 | ||
284d8f55 | 4124 | /* For each events */ |
bec39940 DG |
4125 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
4126 | node.node) { | |
284d8f55 DG |
4127 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
4128 | if (ret < 0) { | |
d0b96690 | 4129 | goto error_unlock; |
487cf67c | 4130 | } |
36dc12cc | 4131 | } |
487cf67c DG |
4132 | } |
4133 | ||
d0b96690 DG |
4134 | pthread_mutex_unlock(&ua_sess->lock); |
4135 | ||
36dc12cc | 4136 | if (usess->start_trace) { |
421cb601 | 4137 | ret = ust_app_start_trace(usess, app); |
36dc12cc | 4138 | if (ret < 0) { |
36dc12cc DG |
4139 | goto error; |
4140 | } | |
4141 | ||
852d0037 | 4142 | DBG2("UST trace started for app pid %d", app->pid); |
36dc12cc DG |
4143 | } |
4144 | ||
ffe60014 DG |
4145 | /* Everything went well at this point. */ |
4146 | rcu_read_unlock(); | |
4147 | return; | |
4148 | ||
d0b96690 DG |
4149 | error_unlock: |
4150 | pthread_mutex_unlock(&ua_sess->lock); | |
487cf67c | 4151 | error: |
ffe60014 | 4152 | if (ua_sess) { |
d0b96690 | 4153 | destroy_app_session(app, ua_sess); |
ffe60014 | 4154 | } |
487cf67c DG |
4155 | rcu_read_unlock(); |
4156 | return; | |
4157 | } | |
55cc08a6 DG |
4158 | |
4159 | /* | |
4160 | * Add context to a specific channel for global UST domain. | |
4161 | */ | |
4162 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
4163 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
4164 | { | |
4165 | int ret = 0; | |
bec39940 DG |
4166 | struct lttng_ht_node_str *ua_chan_node; |
4167 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
4168 | struct ust_app_channel *ua_chan = NULL; |
4169 | struct ust_app_session *ua_sess; | |
4170 | struct ust_app *app; | |
4171 | ||
4172 | rcu_read_lock(); | |
4173 | ||
852d0037 | 4174 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4175 | if (!app->compatible) { |
4176 | /* | |
4177 | * TODO: In time, we should notice the caller of this error by | |
4178 | * telling him that this is a version error. | |
4179 | */ | |
4180 | continue; | |
4181 | } | |
55cc08a6 DG |
4182 | ua_sess = lookup_session_by_app(usess, app); |
4183 | if (ua_sess == NULL) { | |
4184 | continue; | |
4185 | } | |
4186 | ||
d0b96690 | 4187 | pthread_mutex_lock(&ua_sess->lock); |
55cc08a6 | 4188 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4189 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4190 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 4191 | if (ua_chan_node == NULL) { |
d0b96690 | 4192 | goto next_app; |
55cc08a6 DG |
4193 | } |
4194 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
4195 | node); | |
55cc08a6 DG |
4196 | ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app); |
4197 | if (ret < 0) { | |
d0b96690 | 4198 | goto next_app; |
55cc08a6 | 4199 | } |
d0b96690 DG |
4200 | next_app: |
4201 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
4202 | } |
4203 | ||
55cc08a6 DG |
4204 | rcu_read_unlock(); |
4205 | return ret; | |
4206 | } | |
4207 | ||
76d45b40 DG |
4208 | /* |
4209 | * Enable event for a channel from a UST session for a specific PID. | |
4210 | */ | |
4211 | int ust_app_enable_event_pid(struct ltt_ust_session *usess, | |
4212 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4213 | { | |
4214 | int ret = 0; | |
bec39940 | 4215 | struct lttng_ht_iter iter; |
18eace3b | 4216 | struct lttng_ht_node_str *ua_chan_node; |
76d45b40 DG |
4217 | struct ust_app *app; |
4218 | struct ust_app_session *ua_sess; | |
4219 | struct ust_app_channel *ua_chan; | |
4220 | struct ust_app_event *ua_event; | |
4221 | ||
4222 | DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid); | |
4223 | ||
4224 | rcu_read_lock(); | |
4225 | ||
4226 | app = ust_app_find_by_pid(pid); | |
4227 | if (app == NULL) { | |
4228 | ERR("UST app enable event per PID %d not found", pid); | |
4229 | ret = -1; | |
d0b96690 | 4230 | goto end; |
76d45b40 DG |
4231 | } |
4232 | ||
e0c7ec2b DG |
4233 | if (!app->compatible) { |
4234 | ret = 0; | |
d0b96690 | 4235 | goto end; |
e0c7ec2b DG |
4236 | } |
4237 | ||
76d45b40 | 4238 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4239 | if (!ua_sess) { |
4240 | /* The application has problem or is probably dead. */ | |
d0b96690 DG |
4241 | ret = 0; |
4242 | goto end; | |
c4a1715b | 4243 | } |
76d45b40 | 4244 | |
d0b96690 | 4245 | pthread_mutex_lock(&ua_sess->lock); |
76d45b40 | 4246 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4247 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4248 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
76d45b40 DG |
4249 | /* If the channel is not found, there is a code flow error */ |
4250 | assert(ua_chan_node); | |
4251 | ||
4252 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4253 | ||
18eace3b DG |
4254 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
4255 | uevent->filter, uevent->attr.loglevel); | |
4256 | if (ua_event == NULL) { | |
76d45b40 DG |
4257 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
4258 | if (ret < 0) { | |
d0b96690 | 4259 | goto end_unlock; |
76d45b40 DG |
4260 | } |
4261 | } else { | |
76d45b40 DG |
4262 | ret = enable_ust_app_event(ua_sess, ua_event, app); |
4263 | if (ret < 0) { | |
d0b96690 | 4264 | goto end_unlock; |
76d45b40 DG |
4265 | } |
4266 | } | |
4267 | ||
d0b96690 DG |
4268 | end_unlock: |
4269 | pthread_mutex_unlock(&ua_sess->lock); | |
4270 | end: | |
76d45b40 DG |
4271 | rcu_read_unlock(); |
4272 | return ret; | |
4273 | } | |
7f79d3a1 DG |
4274 | |
4275 | /* | |
4276 | * Disable event for a channel from a UST session for a specific PID. | |
4277 | */ | |
4278 | int ust_app_disable_event_pid(struct ltt_ust_session *usess, | |
4279 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4280 | { | |
4281 | int ret = 0; | |
bec39940 DG |
4282 | struct lttng_ht_iter iter; |
4283 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
7f79d3a1 DG |
4284 | struct ust_app *app; |
4285 | struct ust_app_session *ua_sess; | |
4286 | struct ust_app_channel *ua_chan; | |
4287 | struct ust_app_event *ua_event; | |
4288 | ||
4289 | DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid); | |
4290 | ||
4291 | rcu_read_lock(); | |
4292 | ||
4293 | app = ust_app_find_by_pid(pid); | |
4294 | if (app == NULL) { | |
4295 | ERR("UST app disable event per PID %d not found", pid); | |
4296 | ret = -1; | |
4297 | goto error; | |
4298 | } | |
4299 | ||
e0c7ec2b DG |
4300 | if (!app->compatible) { |
4301 | ret = 0; | |
4302 | goto error; | |
4303 | } | |
4304 | ||
7f79d3a1 | 4305 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4306 | if (!ua_sess) { |
4307 | /* The application has problem or is probably dead. */ | |
4308 | goto error; | |
4309 | } | |
7f79d3a1 DG |
4310 | |
4311 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
4312 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4313 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
7f79d3a1 DG |
4314 | if (ua_chan_node == NULL) { |
4315 | /* Channel does not exist, skip disabling */ | |
4316 | goto error; | |
4317 | } | |
4318 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4319 | ||
bec39940 DG |
4320 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter); |
4321 | ua_event_node = lttng_ht_iter_get_node_str(&iter); | |
7f79d3a1 DG |
4322 | if (ua_event_node == NULL) { |
4323 | /* Event does not exist, skip disabling */ | |
4324 | goto error; | |
4325 | } | |
4326 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
4327 | ||
4328 | ret = disable_ust_app_event(ua_sess, ua_event, app); | |
4329 | if (ret < 0) { | |
4330 | goto error; | |
4331 | } | |
4332 | ||
4333 | error: | |
4334 | rcu_read_unlock(); | |
4335 | return ret; | |
4336 | } | |
e0c7ec2b | 4337 | |
4466912f DG |
4338 | /* |
4339 | * Calibrate registered applications. | |
4340 | */ | |
4341 | int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate) | |
4342 | { | |
4343 | int ret = 0; | |
4344 | struct lttng_ht_iter iter; | |
4345 | struct ust_app *app; | |
4346 | ||
4347 | rcu_read_lock(); | |
4348 | ||
852d0037 | 4349 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4466912f DG |
4350 | if (!app->compatible) { |
4351 | /* | |
4352 | * TODO: In time, we should notice the caller of this error by | |
4353 | * telling him that this is a version error. | |
4354 | */ | |
4355 | continue; | |
4356 | } | |
4357 | ||
840cb59c | 4358 | health_code_update(); |
86acf0da | 4359 | |
852d0037 | 4360 | ret = ustctl_calibrate(app->sock, calibrate); |
4466912f DG |
4361 | if (ret < 0) { |
4362 | switch (ret) { | |
4363 | case -ENOSYS: | |
4364 | /* Means that it's not implemented on the tracer side. */ | |
4365 | ret = 0; | |
4366 | break; | |
4367 | default: | |
4466912f | 4368 | DBG2("Calibrate app PID %d returned with error %d", |
852d0037 | 4369 | app->pid, ret); |
4466912f DG |
4370 | break; |
4371 | } | |
4372 | } | |
4373 | } | |
4374 | ||
4375 | DBG("UST app global domain calibration finished"); | |
4376 | ||
4377 | rcu_read_unlock(); | |
4378 | ||
840cb59c | 4379 | health_code_update(); |
86acf0da | 4380 | |
4466912f DG |
4381 | return ret; |
4382 | } | |
d0b96690 DG |
4383 | |
4384 | /* | |
4385 | * Receive registration and populate the given msg structure. | |
4386 | * | |
4387 | * On success return 0 else a negative value returned by the ustctl call. | |
4388 | */ | |
4389 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
4390 | { | |
4391 | int ret; | |
4392 | uint32_t pid, ppid, uid, gid; | |
4393 | ||
4394 | assert(msg); | |
4395 | ||
4396 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
4397 | &pid, &ppid, &uid, &gid, | |
4398 | &msg->bits_per_long, | |
4399 | &msg->uint8_t_alignment, | |
4400 | &msg->uint16_t_alignment, | |
4401 | &msg->uint32_t_alignment, | |
4402 | &msg->uint64_t_alignment, | |
4403 | &msg->long_alignment, | |
4404 | &msg->byte_order, | |
4405 | msg->name); | |
4406 | if (ret < 0) { | |
4407 | switch (-ret) { | |
4408 | case EPIPE: | |
4409 | case ECONNRESET: | |
4410 | case LTTNG_UST_ERR_EXITING: | |
4411 | DBG3("UST app recv reg message failed. Application died"); | |
4412 | break; | |
4413 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
4414 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
4415 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
4416 | LTTNG_UST_ABI_MINOR_VERSION); | |
4417 | break; | |
4418 | default: | |
4419 | ERR("UST app recv reg message failed with ret %d", ret); | |
4420 | break; | |
4421 | } | |
4422 | goto error; | |
4423 | } | |
4424 | msg->pid = (pid_t) pid; | |
4425 | msg->ppid = (pid_t) ppid; | |
4426 | msg->uid = (uid_t) uid; | |
4427 | msg->gid = (gid_t) gid; | |
4428 | ||
4429 | error: | |
4430 | return ret; | |
4431 | } | |
4432 | ||
d88aee68 DG |
4433 | /* |
4434 | * Return a ust app channel object using the application object and the channel | |
4435 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
4436 | * lock MUST be acquired before calling this function. | |
4437 | */ | |
d0b96690 DG |
4438 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
4439 | int objd) | |
4440 | { | |
4441 | struct lttng_ht_node_ulong *node; | |
4442 | struct lttng_ht_iter iter; | |
4443 | struct ust_app_channel *ua_chan = NULL; | |
4444 | ||
4445 | assert(app); | |
4446 | ||
4447 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
4448 | node = lttng_ht_iter_get_node_ulong(&iter); | |
4449 | if (node == NULL) { | |
4450 | DBG2("UST app channel find by objd %d not found", objd); | |
4451 | goto error; | |
4452 | } | |
4453 | ||
4454 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
4455 | ||
4456 | error: | |
4457 | return ua_chan; | |
4458 | } | |
4459 | ||
d88aee68 DG |
4460 | /* |
4461 | * Reply to a register channel notification from an application on the notify | |
4462 | * socket. The channel metadata is also created. | |
4463 | * | |
4464 | * The session UST registry lock is acquired in this function. | |
4465 | * | |
4466 | * On success 0 is returned else a negative value. | |
4467 | */ | |
d0b96690 DG |
4468 | static int reply_ust_register_channel(int sock, int sobjd, int cobjd, |
4469 | size_t nr_fields, struct ustctl_field *fields) | |
4470 | { | |
4471 | int ret, ret_code = 0; | |
4472 | uint32_t chan_id, reg_count; | |
7972aab2 | 4473 | uint64_t chan_reg_key; |
d0b96690 DG |
4474 | enum ustctl_channel_header type; |
4475 | struct ust_app *app; | |
4476 | struct ust_app_channel *ua_chan; | |
4477 | struct ust_app_session *ua_sess; | |
7972aab2 | 4478 | struct ust_registry_session *registry; |
45893984 | 4479 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
4480 | |
4481 | rcu_read_lock(); | |
4482 | ||
4483 | /* Lookup application. If not found, there is a code flow error. */ | |
4484 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4485 | if (!app) { |
4486 | DBG("Application socket %d is being teardown. Abort event notify", | |
4487 | sock); | |
4488 | ret = 0; | |
d5d629b5 | 4489 | free(fields); |
d88aee68 DG |
4490 | goto error_rcu_unlock; |
4491 | } | |
d0b96690 | 4492 | |
4950b860 | 4493 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4494 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4495 | if (!ua_chan) { |
4496 | DBG("Application channel is being teardown. Abort event notify"); | |
4497 | ret = 0; | |
d5d629b5 | 4498 | free(fields); |
4950b860 MD |
4499 | goto error_rcu_unlock; |
4500 | } | |
4501 | ||
d0b96690 DG |
4502 | assert(ua_chan->session); |
4503 | ua_sess = ua_chan->session; | |
d0b96690 | 4504 | |
7972aab2 DG |
4505 | /* Get right session registry depending on the session buffer type. */ |
4506 | registry = get_session_registry(ua_sess); | |
4507 | assert(registry); | |
45893984 | 4508 | |
7972aab2 DG |
4509 | /* Depending on the buffer type, a different channel key is used. */ |
4510 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4511 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 4512 | } else { |
7972aab2 | 4513 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
4514 | } |
4515 | ||
7972aab2 DG |
4516 | pthread_mutex_lock(®istry->lock); |
4517 | ||
4518 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
4519 | assert(chan_reg); | |
4520 | ||
4521 | if (!chan_reg->register_done) { | |
4522 | reg_count = ust_registry_get_event_count(chan_reg); | |
4523 | if (reg_count < 31) { | |
4524 | type = USTCTL_CHANNEL_HEADER_COMPACT; | |
4525 | } else { | |
4526 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
4527 | } | |
4528 | ||
4529 | chan_reg->nr_ctx_fields = nr_fields; | |
4530 | chan_reg->ctx_fields = fields; | |
4531 | chan_reg->header_type = type; | |
d0b96690 | 4532 | } else { |
7972aab2 DG |
4533 | /* Get current already assigned values. */ |
4534 | type = chan_reg->header_type; | |
d5d629b5 DG |
4535 | free(fields); |
4536 | /* Set to NULL so the error path does not do a double free. */ | |
4537 | fields = NULL; | |
d0b96690 | 4538 | } |
7972aab2 DG |
4539 | /* Channel id is set during the object creation. */ |
4540 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
4541 | |
4542 | /* Append to metadata */ | |
7972aab2 DG |
4543 | if (!chan_reg->metadata_dumped) { |
4544 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
4545 | if (ret_code) { |
4546 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
4547 | goto reply; | |
4548 | } | |
4549 | } | |
4550 | ||
4551 | reply: | |
7972aab2 DG |
4552 | DBG3("UST app replying to register channel key %" PRIu64 |
4553 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
4554 | ret_code); | |
d0b96690 DG |
4555 | |
4556 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
4557 | if (ret < 0) { | |
4558 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4559 | ERR("UST app reply channel failed with ret %d", ret); | |
4560 | } else { | |
4561 | DBG3("UST app reply channel failed. Application died"); | |
4562 | } | |
4563 | goto error; | |
4564 | } | |
4565 | ||
7972aab2 DG |
4566 | /* This channel registry registration is completed. */ |
4567 | chan_reg->register_done = 1; | |
4568 | ||
d0b96690 | 4569 | error: |
7972aab2 | 4570 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4571 | error_rcu_unlock: |
d0b96690 | 4572 | rcu_read_unlock(); |
d5d629b5 DG |
4573 | if (ret) { |
4574 | free(fields); | |
4575 | } | |
d0b96690 DG |
4576 | return ret; |
4577 | } | |
4578 | ||
d88aee68 DG |
4579 | /* |
4580 | * Add event to the UST channel registry. When the event is added to the | |
4581 | * registry, the metadata is also created. Once done, this replies to the | |
4582 | * application with the appropriate error code. | |
4583 | * | |
4584 | * The session UST registry lock is acquired in the function. | |
4585 | * | |
4586 | * On success 0 is returned else a negative value. | |
4587 | */ | |
d0b96690 DG |
4588 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
4589 | char *sig, size_t nr_fields, struct ustctl_field *fields, int loglevel, | |
4590 | char *model_emf_uri) | |
4591 | { | |
4592 | int ret, ret_code; | |
4593 | uint32_t event_id = 0; | |
7972aab2 | 4594 | uint64_t chan_reg_key; |
d0b96690 DG |
4595 | struct ust_app *app; |
4596 | struct ust_app_channel *ua_chan; | |
4597 | struct ust_app_session *ua_sess; | |
7972aab2 | 4598 | struct ust_registry_session *registry; |
d0b96690 DG |
4599 | |
4600 | rcu_read_lock(); | |
4601 | ||
4602 | /* Lookup application. If not found, there is a code flow error. */ | |
4603 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4604 | if (!app) { |
4605 | DBG("Application socket %d is being teardown. Abort event notify", | |
4606 | sock); | |
4607 | ret = 0; | |
d5d629b5 DG |
4608 | free(sig); |
4609 | free(fields); | |
4610 | free(model_emf_uri); | |
d88aee68 DG |
4611 | goto error_rcu_unlock; |
4612 | } | |
d0b96690 | 4613 | |
4950b860 | 4614 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4615 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4616 | if (!ua_chan) { |
4617 | DBG("Application channel is being teardown. Abort event notify"); | |
4618 | ret = 0; | |
d5d629b5 DG |
4619 | free(sig); |
4620 | free(fields); | |
4621 | free(model_emf_uri); | |
4950b860 MD |
4622 | goto error_rcu_unlock; |
4623 | } | |
4624 | ||
d0b96690 DG |
4625 | assert(ua_chan->session); |
4626 | ua_sess = ua_chan->session; | |
4627 | ||
7972aab2 DG |
4628 | registry = get_session_registry(ua_sess); |
4629 | assert(registry); | |
4630 | ||
4631 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4632 | chan_reg_key = ua_chan->tracing_channel_id; | |
4633 | } else { | |
4634 | chan_reg_key = ua_chan->key; | |
4635 | } | |
4636 | ||
4637 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 4638 | |
d5d629b5 DG |
4639 | /* |
4640 | * From this point on, this call acquires the ownership of the sig, fields | |
4641 | * and model_emf_uri meaning any free are done inside it if needed. These | |
4642 | * three variables MUST NOT be read/write after this. | |
4643 | */ | |
7972aab2 | 4644 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
45893984 | 4645 | sobjd, cobjd, name, sig, nr_fields, fields, loglevel, |
7972aab2 | 4646 | model_emf_uri, ua_sess->buffer_type, &event_id); |
d0b96690 DG |
4647 | |
4648 | /* | |
4649 | * The return value is returned to ustctl so in case of an error, the | |
4650 | * application can be notified. In case of an error, it's important not to | |
4651 | * return a negative error or else the application will get closed. | |
4652 | */ | |
4653 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
4654 | if (ret < 0) { | |
4655 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4656 | ERR("UST app reply event failed with ret %d", ret); | |
4657 | } else { | |
4658 | DBG3("UST app reply event failed. Application died"); | |
4659 | } | |
4660 | /* | |
4661 | * No need to wipe the create event since the application socket will | |
4662 | * get close on error hence cleaning up everything by itself. | |
4663 | */ | |
4664 | goto error; | |
4665 | } | |
4666 | ||
7972aab2 DG |
4667 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
4668 | name, event_id); | |
d88aee68 | 4669 | |
d0b96690 | 4670 | error: |
7972aab2 | 4671 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4672 | error_rcu_unlock: |
d0b96690 DG |
4673 | rcu_read_unlock(); |
4674 | return ret; | |
4675 | } | |
4676 | ||
d88aee68 DG |
4677 | /* |
4678 | * Handle application notification through the given notify socket. | |
4679 | * | |
4680 | * Return 0 on success or else a negative value. | |
4681 | */ | |
d0b96690 DG |
4682 | int ust_app_recv_notify(int sock) |
4683 | { | |
4684 | int ret; | |
4685 | enum ustctl_notify_cmd cmd; | |
4686 | ||
4687 | DBG3("UST app receiving notify from sock %d", sock); | |
4688 | ||
4689 | ret = ustctl_recv_notify(sock, &cmd); | |
4690 | if (ret < 0) { | |
4691 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4692 | ERR("UST app recv notify failed with ret %d", ret); | |
4693 | } else { | |
4694 | DBG3("UST app recv notify failed. Application died"); | |
4695 | } | |
4696 | goto error; | |
4697 | } | |
4698 | ||
4699 | switch (cmd) { | |
4700 | case USTCTL_NOTIFY_CMD_EVENT: | |
4701 | { | |
4702 | int sobjd, cobjd, loglevel; | |
4703 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; | |
4704 | size_t nr_fields; | |
4705 | struct ustctl_field *fields; | |
4706 | ||
4707 | DBG2("UST app ustctl register event received"); | |
4708 | ||
4709 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, &loglevel, | |
4710 | &sig, &nr_fields, &fields, &model_emf_uri); | |
4711 | if (ret < 0) { | |
4712 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4713 | ERR("UST app recv event failed with ret %d", ret); | |
4714 | } else { | |
4715 | DBG3("UST app recv event failed. Application died"); | |
4716 | } | |
4717 | goto error; | |
4718 | } | |
4719 | ||
d5d629b5 DG |
4720 | /* |
4721 | * Add event to the UST registry coming from the notify socket. This | |
4722 | * call will free if needed the sig, fields and model_emf_uri. This | |
4723 | * code path loses the ownsership of these variables and transfer them | |
4724 | * to the this function. | |
4725 | */ | |
d0b96690 DG |
4726 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
4727 | fields, loglevel, model_emf_uri); | |
4728 | if (ret < 0) { | |
4729 | goto error; | |
4730 | } | |
4731 | ||
4732 | break; | |
4733 | } | |
4734 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
4735 | { | |
4736 | int sobjd, cobjd; | |
4737 | size_t nr_fields; | |
4738 | struct ustctl_field *fields; | |
4739 | ||
4740 | DBG2("UST app ustctl register channel received"); | |
4741 | ||
4742 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
4743 | &fields); | |
4744 | if (ret < 0) { | |
4745 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4746 | ERR("UST app recv channel failed with ret %d", ret); | |
4747 | } else { | |
4748 | DBG3("UST app recv channel failed. Application died"); | |
4749 | } | |
4750 | goto error; | |
4751 | } | |
4752 | ||
d5d629b5 DG |
4753 | /* |
4754 | * The fields ownership are transfered to this function call meaning | |
4755 | * that if needed it will be freed. After this, it's invalid to access | |
4756 | * fields or clean it up. | |
4757 | */ | |
d0b96690 DG |
4758 | ret = reply_ust_register_channel(sock, sobjd, cobjd, nr_fields, |
4759 | fields); | |
4760 | if (ret < 0) { | |
4761 | goto error; | |
4762 | } | |
4763 | ||
4764 | break; | |
4765 | } | |
4766 | default: | |
4767 | /* Should NEVER happen. */ | |
4768 | assert(0); | |
4769 | } | |
4770 | ||
4771 | error: | |
4772 | return ret; | |
4773 | } | |
d88aee68 DG |
4774 | |
4775 | /* | |
4776 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
4777 | * corresponding application. On failure, the call_rcu to close the socket is | |
4778 | * executed. If an application is found, it tries to delete it from the notify | |
4779 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
4780 | * | |
4781 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
4782 | * call RCU is not done but the rest of the cleanup is. | |
4783 | */ | |
4784 | void ust_app_notify_sock_unregister(int sock) | |
4785 | { | |
4786 | int err_enomem = 0; | |
4787 | struct lttng_ht_iter iter; | |
4788 | struct ust_app *app; | |
4789 | struct ust_app_notify_sock_obj *obj; | |
4790 | ||
4791 | assert(sock >= 0); | |
4792 | ||
4793 | rcu_read_lock(); | |
4794 | ||
4795 | obj = zmalloc(sizeof(*obj)); | |
4796 | if (!obj) { | |
4797 | /* | |
4798 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
4799 | * procedure but the call_rcu will not be called. In this case, we | |
4800 | * accept the fd leak rather than possibly creating an unsynchronized | |
4801 | * state between threads. | |
4802 | * | |
4803 | * TODO: The notify object should be created once the notify socket is | |
4804 | * registered and stored independantely from the ust app object. The | |
4805 | * tricky part is to synchronize the teardown of the application and | |
4806 | * this notify object. Let's keep that in mind so we can avoid this | |
4807 | * kind of shenanigans with ENOMEM in the teardown path. | |
4808 | */ | |
4809 | err_enomem = 1; | |
4810 | } else { | |
4811 | obj->fd = sock; | |
4812 | } | |
4813 | ||
4814 | DBG("UST app notify socket unregister %d", sock); | |
4815 | ||
4816 | /* | |
4817 | * Lookup application by notify socket. If this fails, this means that the | |
4818 | * hash table delete has already been done by the application | |
4819 | * unregistration process so we can safely close the notify socket in a | |
4820 | * call RCU. | |
4821 | */ | |
4822 | app = find_app_by_notify_sock(sock); | |
4823 | if (!app) { | |
4824 | goto close_socket; | |
4825 | } | |
4826 | ||
4827 | iter.iter.node = &app->notify_sock_n.node; | |
4828 | ||
4829 | /* | |
4830 | * Whatever happens here either we fail or succeed, in both cases we have | |
4831 | * to close the socket after a grace period to continue to the call RCU | |
4832 | * here. If the deletion is successful, the application is not visible | |
4833 | * anymore by other threads and is it fails it means that it was already | |
4834 | * deleted from the hash table so either way we just have to close the | |
4835 | * socket. | |
4836 | */ | |
4837 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
4838 | ||
4839 | close_socket: | |
4840 | rcu_read_unlock(); | |
4841 | ||
4842 | /* | |
4843 | * Close socket after a grace period to avoid for the socket to be reused | |
4844 | * before the application object is freed creating potential race between | |
4845 | * threads trying to add unique in the global hash table. | |
4846 | */ | |
4847 | if (!err_enomem) { | |
4848 | call_rcu(&obj->head, close_notify_sock_rcu); | |
4849 | } | |
4850 | } | |
f45e313d DG |
4851 | |
4852 | /* | |
4853 | * Destroy a ust app data structure and free its memory. | |
4854 | */ | |
4855 | void ust_app_destroy(struct ust_app *app) | |
4856 | { | |
4857 | if (!app) { | |
4858 | return; | |
4859 | } | |
4860 | ||
4861 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
4862 | } |