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> | |
20 | #include <pthread.h> | |
21 | #include <stdio.h> | |
22 | #include <stdlib.h> | |
099e26bd | 23 | #include <string.h> |
aba8e916 DG |
24 | #include <sys/stat.h> |
25 | #include <sys/types.h> | |
099e26bd | 26 | #include <unistd.h> |
0df502fd | 27 | #include <urcu/compiler.h> |
fb54cdbf | 28 | #include <lttng/ust-error.h> |
bec39940 | 29 | |
990570ed | 30 | #include <common/common.h> |
86acf0da | 31 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 32 | |
86acf0da DG |
33 | #include "fd-limit.h" |
34 | #include "health.h" | |
56fff090 | 35 | #include "ust-app.h" |
48842b30 | 36 | #include "ust-consumer.h" |
d80a6244 DG |
37 | #include "ust-ctl.h" |
38 | ||
ffe60014 DG |
39 | /* Next available channel key. */ |
40 | static unsigned long next_channel_key; | |
41 | ||
42 | /* | |
43 | * Return the atomically incremented value of next_channel_key. | |
44 | */ | |
45 | static inline unsigned long get_next_channel_key(void) | |
46 | { | |
47 | return uatomic_add_return(&next_channel_key, 1); | |
48 | } | |
49 | ||
50 | /* | |
51 | * Return the consumer socket from the given consumer output with the right | |
52 | * bitness. On error, returns NULL. | |
53 | * | |
54 | * The caller MUST acquire a rcu read side lock and keep it until the socket | |
55 | * object reference is not needed anymore. | |
56 | */ | |
57 | static struct consumer_socket *find_consumer_socket_by_bitness(int bits, | |
58 | struct consumer_output *consumer) | |
59 | { | |
60 | int consumer_fd; | |
61 | struct consumer_socket *socket = NULL; | |
62 | ||
63 | switch (bits) { | |
64 | case 64: | |
65 | consumer_fd = uatomic_read(&ust_consumerd64_fd); | |
66 | break; | |
67 | case 32: | |
68 | consumer_fd = uatomic_read(&ust_consumerd32_fd); | |
69 | break; | |
70 | default: | |
71 | assert(0); | |
72 | goto end; | |
73 | } | |
74 | ||
75 | socket = consumer_find_socket(consumer_fd, consumer); | |
d88aee68 DG |
76 | if (!socket) { |
77 | ERR("Consumer socket fd %d not found in consumer obj %p", | |
78 | consumer_fd, consumer); | |
79 | } | |
ffe60014 DG |
80 | |
81 | end: | |
82 | return socket; | |
83 | } | |
84 | ||
025faf73 DG |
85 | /* |
86 | * Match function for the hash table lookup. | |
87 | * | |
88 | * It matches an ust app event based on three attributes which are the event | |
89 | * name, the filter bytecode and the loglevel. | |
90 | */ | |
18eace3b DG |
91 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
92 | { | |
93 | struct ust_app_event *event; | |
94 | const struct ust_app_ht_key *key; | |
95 | ||
96 | assert(node); | |
97 | assert(_key); | |
98 | ||
99 | event = caa_container_of(node, struct ust_app_event, node.node); | |
100 | key = _key; | |
101 | ||
102 | /* Match the 3 elements of the key: name, filter and loglevel. */ | |
103 | ||
104 | /* Event name */ | |
105 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
106 | goto no_match; | |
107 | } | |
108 | ||
109 | /* Event loglevel. */ | |
110 | if (event->attr.loglevel != key->loglevel) { | |
025faf73 DG |
111 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
112 | && key->loglevel == 0 && event->attr.loglevel == -1) { | |
113 | /* | |
114 | * Match is accepted. This is because on event creation, the | |
115 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
116 | * -1 are accepted for this loglevel type since 0 is the one set by | |
117 | * the API when receiving an enable event. | |
118 | */ | |
119 | } else { | |
120 | goto no_match; | |
121 | } | |
18eace3b DG |
122 | } |
123 | ||
124 | /* One of the filters is NULL, fail. */ | |
125 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
126 | goto no_match; | |
127 | } | |
128 | ||
025faf73 DG |
129 | if (key->filter && event->filter) { |
130 | /* Both filters exists, check length followed by the bytecode. */ | |
131 | if (event->filter->len != key->filter->len || | |
132 | memcmp(event->filter->data, key->filter->data, | |
133 | event->filter->len) != 0) { | |
134 | goto no_match; | |
135 | } | |
18eace3b DG |
136 | } |
137 | ||
025faf73 | 138 | /* Match. */ |
18eace3b DG |
139 | return 1; |
140 | ||
141 | no_match: | |
142 | return 0; | |
18eace3b DG |
143 | } |
144 | ||
025faf73 DG |
145 | /* |
146 | * Unique add of an ust app event in the given ht. This uses the custom | |
147 | * ht_match_ust_app_event match function and the event name as hash. | |
148 | */ | |
d0b96690 | 149 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
150 | struct ust_app_event *event) |
151 | { | |
152 | struct cds_lfht_node *node_ptr; | |
153 | struct ust_app_ht_key key; | |
d0b96690 | 154 | struct lttng_ht *ht; |
18eace3b | 155 | |
d0b96690 DG |
156 | assert(ua_chan); |
157 | assert(ua_chan->events); | |
18eace3b DG |
158 | assert(event); |
159 | ||
d0b96690 | 160 | ht = ua_chan->events; |
18eace3b DG |
161 | key.name = event->attr.name; |
162 | key.filter = event->filter; | |
163 | key.loglevel = event->attr.loglevel; | |
164 | ||
165 | node_ptr = cds_lfht_add_unique(ht->ht, | |
166 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
167 | ht_match_ust_app_event, &key, &event->node.node); | |
168 | assert(node_ptr == &event->node.node); | |
169 | } | |
170 | ||
d88aee68 DG |
171 | /* |
172 | * Close the notify socket from the given RCU head object. This MUST be called | |
173 | * through a call_rcu(). | |
174 | */ | |
175 | static void close_notify_sock_rcu(struct rcu_head *head) | |
176 | { | |
177 | int ret; | |
178 | struct ust_app_notify_sock_obj *obj = | |
179 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
180 | ||
181 | /* Must have a valid fd here. */ | |
182 | assert(obj->fd >= 0); | |
183 | ||
184 | ret = close(obj->fd); | |
185 | if (ret) { | |
186 | ERR("close notify sock %d RCU", obj->fd); | |
187 | } | |
188 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
189 | ||
190 | free(obj); | |
191 | } | |
192 | ||
55cc08a6 DG |
193 | /* |
194 | * Delete ust context safely. RCU read lock must be held before calling | |
195 | * this function. | |
196 | */ | |
197 | static | |
198 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx) | |
199 | { | |
ffe60014 DG |
200 | int ret; |
201 | ||
202 | assert(ua_ctx); | |
203 | ||
55cc08a6 | 204 | if (ua_ctx->obj) { |
ffe60014 | 205 | ret = ustctl_release_object(sock, ua_ctx->obj); |
d0b96690 DG |
206 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
207 | ERR("UST app sock %d release ctx obj handle %d failed with ret %d", | |
208 | sock, ua_ctx->obj->handle, ret); | |
ffe60014 | 209 | } |
55cc08a6 DG |
210 | free(ua_ctx->obj); |
211 | } | |
212 | free(ua_ctx); | |
213 | } | |
214 | ||
d80a6244 DG |
215 | /* |
216 | * Delete ust app event safely. RCU read lock must be held before calling | |
217 | * this function. | |
218 | */ | |
8b366481 DG |
219 | static |
220 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event) | |
d80a6244 | 221 | { |
ffe60014 DG |
222 | int ret; |
223 | ||
224 | assert(ua_event); | |
225 | ||
53a80697 | 226 | free(ua_event->filter); |
d80a6244 | 227 | |
edb67388 | 228 | if (ua_event->obj != NULL) { |
ffe60014 DG |
229 | ret = ustctl_release_object(sock, ua_event->obj); |
230 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
231 | ERR("UST app sock %d release event obj failed with ret %d", | |
232 | sock, ret); | |
233 | } | |
edb67388 DG |
234 | free(ua_event->obj); |
235 | } | |
d80a6244 DG |
236 | free(ua_event); |
237 | } | |
238 | ||
239 | /* | |
240 | * Delete ust app stream safely. RCU read lock must be held before calling | |
241 | * this function. | |
242 | */ | |
8b366481 | 243 | static |
030a66fa | 244 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream) |
d80a6244 | 245 | { |
ffe60014 DG |
246 | int ret; |
247 | ||
248 | assert(stream); | |
249 | ||
8b366481 | 250 | if (stream->obj) { |
ffe60014 DG |
251 | ret = ustctl_release_object(sock, stream->obj); |
252 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
253 | ERR("UST app sock %d release stream obj failed with ret %d", | |
254 | sock, ret); | |
255 | } | |
4063050c | 256 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
257 | free(stream->obj); |
258 | } | |
84cd17c6 | 259 | free(stream); |
d80a6244 DG |
260 | } |
261 | ||
262 | /* | |
263 | * Delete ust app channel safely. RCU read lock must be held before calling | |
264 | * this function. | |
265 | */ | |
8b366481 | 266 | static |
d0b96690 DG |
267 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
268 | struct ust_app *app) | |
d80a6244 DG |
269 | { |
270 | int ret; | |
bec39940 | 271 | struct lttng_ht_iter iter; |
d80a6244 | 272 | struct ust_app_event *ua_event; |
55cc08a6 | 273 | struct ust_app_ctx *ua_ctx; |
030a66fa | 274 | struct ust_app_stream *stream, *stmp; |
d80a6244 | 275 | |
ffe60014 DG |
276 | assert(ua_chan); |
277 | ||
278 | DBG3("UST app deleting channel %s", ua_chan->name); | |
279 | ||
55cc08a6 | 280 | /* Wipe stream */ |
d80a6244 | 281 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 282 | cds_list_del(&stream->list); |
d80a6244 DG |
283 | delete_ust_app_stream(sock, stream); |
284 | } | |
285 | ||
55cc08a6 | 286 | /* Wipe context */ |
bec39940 DG |
287 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
288 | ret = lttng_ht_del(ua_chan->ctx, &iter); | |
55cc08a6 DG |
289 | assert(!ret); |
290 | delete_ust_app_ctx(sock, ua_ctx); | |
291 | } | |
bec39940 | 292 | lttng_ht_destroy(ua_chan->ctx); |
d80a6244 | 293 | |
55cc08a6 | 294 | /* Wipe events */ |
bec39940 DG |
295 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
296 | node.node) { | |
297 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 298 | assert(!ret); |
d80a6244 DG |
299 | delete_ust_app_event(sock, ua_event); |
300 | } | |
bec39940 | 301 | lttng_ht_destroy(ua_chan->events); |
edb67388 | 302 | |
45893984 DG |
303 | /* Wipe and free registry from session registry. */ |
304 | ust_registry_channel_del_free(ua_chan->session->registry, ua_chan->key); | |
d0b96690 | 305 | |
edb67388 | 306 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
307 | /* Remove channel from application UST object descriptor. */ |
308 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
309 | lttng_ht_del(app->ust_objd, &iter); | |
ffe60014 DG |
310 | ret = ustctl_release_object(sock, ua_chan->obj); |
311 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
312 | ERR("UST app sock %d release channel obj failed with ret %d", | |
313 | sock, ret); | |
314 | } | |
4063050c | 315 | lttng_fd_put(LTTNG_FD_APPS, 2); |
edb67388 DG |
316 | free(ua_chan->obj); |
317 | } | |
84cd17c6 | 318 | free(ua_chan); |
d80a6244 DG |
319 | } |
320 | ||
d88aee68 DG |
321 | /* |
322 | * For a given application and session, push metadata to consumer. The session | |
323 | * lock MUST be acquired here before calling this. | |
324 | * | |
325 | * Return 0 on success else a negative error. | |
326 | */ | |
327 | static int push_metadata(struct ust_app *app, struct ust_app_session *ua_sess) | |
328 | { | |
329 | int ret; | |
330 | char *metadata_str = NULL; | |
331 | size_t len, offset; | |
332 | struct consumer_socket *socket; | |
333 | ||
334 | assert(app); | |
335 | assert(ua_sess); | |
336 | ||
337 | if (!ua_sess->consumer || !ua_sess->metadata) { | |
338 | /* No consumer means no stream associated so just return gracefully. */ | |
339 | ret = 0; | |
340 | goto end; | |
341 | } | |
342 | ||
343 | rcu_read_lock(); | |
344 | ||
345 | /* Get consumer socket to use to push the metadata.*/ | |
346 | socket = find_consumer_socket_by_bitness(app->bits_per_long, | |
347 | ua_sess->consumer); | |
348 | if (!socket) { | |
349 | ret = -1; | |
350 | goto error_rcu_unlock; | |
351 | } | |
352 | ||
353 | /* | |
354 | * TODO: Currently, we hold the socket lock around sampling of the next | |
355 | * metadata segment to ensure we send metadata over the consumer socket in | |
356 | * the correct order. This makes the registry lock nest inside the socket | |
357 | * lock. | |
358 | * | |
359 | * Please note that this is a temporary measure: we should move this lock | |
360 | * back into ust_consumer_push_metadata() when the consumer gets the | |
361 | * ability to reorder the metadata it receives. | |
362 | */ | |
363 | pthread_mutex_lock(socket->lock); | |
45893984 | 364 | pthread_mutex_lock(&ua_sess->registry->lock); |
d88aee68 | 365 | |
45893984 DG |
366 | offset = ua_sess->registry->metadata_len_sent; |
367 | len = ua_sess->registry->metadata_len - | |
368 | ua_sess->registry->metadata_len_sent; | |
d88aee68 DG |
369 | if (len == 0) { |
370 | DBG3("No metadata to push for session id %d", ua_sess->id); | |
371 | ret = 0; | |
372 | goto error_reg_unlock; | |
373 | } | |
374 | assert(len > 0); | |
375 | ||
376 | /* Allocate only what we have to send. */ | |
377 | metadata_str = zmalloc(len); | |
378 | if (!metadata_str) { | |
379 | PERROR("zmalloc ust app metadata string"); | |
380 | ret = -ENOMEM; | |
381 | goto error_reg_unlock; | |
382 | } | |
383 | /* Copy what we haven't send out. */ | |
45893984 | 384 | memcpy(metadata_str, ua_sess->registry->metadata + offset, len); |
d88aee68 | 385 | |
45893984 | 386 | pthread_mutex_unlock(&ua_sess->registry->lock); |
d88aee68 DG |
387 | |
388 | ret = ust_consumer_push_metadata(socket, ua_sess, metadata_str, len, | |
389 | offset); | |
390 | if (ret < 0) { | |
391 | pthread_mutex_unlock(socket->lock); | |
392 | goto error_rcu_unlock; | |
393 | } | |
394 | ||
395 | /* Update len sent of the registry. */ | |
45893984 DG |
396 | pthread_mutex_lock(&ua_sess->registry->lock); |
397 | ua_sess->registry->metadata_len_sent += len; | |
398 | pthread_mutex_unlock(&ua_sess->registry->lock); | |
d88aee68 DG |
399 | pthread_mutex_unlock(socket->lock); |
400 | ||
401 | rcu_read_unlock(); | |
402 | free(metadata_str); | |
403 | return 0; | |
404 | ||
405 | error_reg_unlock: | |
45893984 | 406 | pthread_mutex_unlock(&ua_sess->registry->lock); |
d88aee68 DG |
407 | pthread_mutex_unlock(socket->lock); |
408 | error_rcu_unlock: | |
409 | rcu_read_unlock(); | |
410 | free(metadata_str); | |
411 | end: | |
412 | return ret; | |
413 | } | |
414 | ||
415 | /* | |
416 | * Send to the consumer a close metadata command for the given session. Once | |
417 | * done, the metadata channel is deleted and the session metadata pointer is | |
418 | * nullified. The session lock MUST be acquired here unless the application is | |
419 | * in the destroy path. | |
420 | * | |
421 | * Return 0 on success else a negative value. | |
422 | */ | |
423 | static int close_metadata(struct ust_app *app, struct ust_app_session *ua_sess) | |
424 | { | |
425 | int ret; | |
426 | struct consumer_socket *socket; | |
427 | ||
428 | assert(app); | |
429 | assert(ua_sess); | |
430 | ||
431 | /* Ignore if no metadata. Valid since it can be called on unregister. */ | |
432 | if (!ua_sess->metadata) { | |
433 | ret = 0; | |
434 | goto error; | |
435 | } | |
436 | ||
437 | rcu_read_lock(); | |
438 | ||
439 | /* Get consumer socket to use to push the metadata.*/ | |
440 | socket = find_consumer_socket_by_bitness(app->bits_per_long, | |
441 | ua_sess->consumer); | |
442 | if (!socket) { | |
443 | ret = -1; | |
444 | goto error_rcu_unlock; | |
445 | } | |
446 | ||
447 | ret = ust_consumer_close_metadata(socket, ua_sess->metadata); | |
448 | if (ret < 0) { | |
449 | goto error_rcu_unlock; | |
450 | } | |
451 | ||
452 | error_rcu_unlock: | |
453 | /* Destroy metadata on our side since we must not use it anymore. */ | |
454 | delete_ust_app_channel(-1, ua_sess->metadata, app); | |
455 | ua_sess->metadata = NULL; | |
456 | ||
457 | rcu_read_unlock(); | |
458 | error: | |
459 | return ret; | |
460 | } | |
461 | ||
d80a6244 DG |
462 | /* |
463 | * Delete ust app session safely. RCU read lock must be held before calling | |
464 | * this function. | |
465 | */ | |
8b366481 | 466 | static |
d0b96690 DG |
467 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
468 | struct ust_app *app) | |
d80a6244 DG |
469 | { |
470 | int ret; | |
bec39940 | 471 | struct lttng_ht_iter iter; |
d80a6244 DG |
472 | struct ust_app_channel *ua_chan; |
473 | ||
d88aee68 DG |
474 | assert(ua_sess); |
475 | ||
d80a6244 | 476 | if (ua_sess->metadata) { |
d88aee68 DG |
477 | /* Push metadata for application before freeing the application. */ |
478 | (void) push_metadata(app, ua_sess); | |
479 | ||
480 | /* And ask to close it for this session. */ | |
481 | (void) close_metadata(app, ua_sess); | |
d80a6244 DG |
482 | } |
483 | ||
bec39940 DG |
484 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
485 | node.node) { | |
486 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 487 | assert(!ret); |
d0b96690 | 488 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 489 | } |
bec39940 | 490 | lttng_ht_destroy(ua_sess->channels); |
d80a6244 | 491 | |
45893984 DG |
492 | ust_registry_session_destroy(ua_sess->registry); |
493 | free(ua_sess->registry); | |
d0b96690 | 494 | |
aee6bafd | 495 | if (ua_sess->handle != -1) { |
ffe60014 DG |
496 | ret = ustctl_release_handle(sock, ua_sess->handle); |
497 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
498 | ERR("UST app sock %d release session handle failed with ret %d", | |
499 | sock, ret); | |
500 | } | |
aee6bafd | 501 | } |
8b366481 | 502 | free(ua_sess); |
d80a6244 | 503 | } |
91d76f53 DG |
504 | |
505 | /* | |
284d8f55 DG |
506 | * Delete a traceable application structure from the global list. Never call |
507 | * this function outside of a call_rcu call. | |
91d76f53 | 508 | */ |
8b366481 DG |
509 | static |
510 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 511 | { |
8b366481 | 512 | int ret, sock; |
d42f20df | 513 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 514 | |
f6a9efaa | 515 | rcu_read_lock(); |
44d3bd01 | 516 | |
d80a6244 | 517 | /* Delete ust app sessions info */ |
852d0037 DG |
518 | sock = app->sock; |
519 | app->sock = -1; | |
d80a6244 | 520 | |
d42f20df DG |
521 | lttng_ht_destroy(app->sessions); |
522 | ||
8b366481 | 523 | /* Wipe sessions */ |
d42f20df DG |
524 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
525 | teardown_node) { | |
526 | /* Free every object in the session and the session. */ | |
d0b96690 | 527 | delete_ust_app_session(sock, ua_sess, app); |
d80a6244 | 528 | } |
d80a6244 | 529 | |
6414a713 | 530 | /* |
852d0037 DG |
531 | * Wait until we have deleted the application from the sock hash table |
532 | * before closing this socket, otherwise an application could re-use the | |
533 | * socket ID and race with the teardown, using the same hash table entry. | |
534 | * | |
535 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
536 | * all RCU readers that could run concurrently with unregister app, | |
537 | * therefore we _need_ to only close that socket after a grace period. So | |
538 | * it should stay in this RCU callback. | |
539 | * | |
540 | * This close() is a very important step of the synchronization model so | |
541 | * every modification to this function must be carefully reviewed. | |
6414a713 | 542 | */ |
799e2c4f MD |
543 | ret = close(sock); |
544 | if (ret) { | |
545 | PERROR("close"); | |
546 | } | |
4063050c | 547 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 548 | |
852d0037 | 549 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 550 | free(app); |
bec39940 | 551 | |
f6a9efaa | 552 | rcu_read_unlock(); |
099e26bd DG |
553 | } |
554 | ||
555 | /* | |
f6a9efaa | 556 | * URCU intermediate call to delete an UST app. |
099e26bd | 557 | */ |
8b366481 DG |
558 | static |
559 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 560 | { |
bec39940 DG |
561 | struct lttng_ht_node_ulong *node = |
562 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 563 | struct ust_app *app = |
852d0037 | 564 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 565 | |
852d0037 | 566 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 567 | delete_ust_app(app); |
099e26bd DG |
568 | } |
569 | ||
ffe60014 DG |
570 | /* |
571 | * Delete the session from the application ht and delete the data structure by | |
572 | * freeing every object inside and releasing them. | |
573 | */ | |
d0b96690 | 574 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
575 | struct ust_app_session *ua_sess) |
576 | { | |
577 | int ret; | |
578 | struct lttng_ht_iter iter; | |
579 | ||
580 | assert(app); | |
581 | assert(ua_sess); | |
582 | ||
583 | iter.iter.node = &ua_sess->node.node; | |
584 | ret = lttng_ht_del(app->sessions, &iter); | |
585 | if (ret) { | |
586 | /* Already scheduled for teardown. */ | |
587 | goto end; | |
588 | } | |
589 | ||
590 | /* Once deleted, free the data structure. */ | |
d0b96690 | 591 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
592 | |
593 | end: | |
594 | return; | |
595 | } | |
596 | ||
8b366481 DG |
597 | /* |
598 | * Alloc new UST app session. | |
599 | */ | |
600 | static | |
d0b96690 | 601 | struct ust_app_session *alloc_ust_app_session(struct ust_app *app) |
8b366481 DG |
602 | { |
603 | struct ust_app_session *ua_sess; | |
604 | ||
605 | /* Init most of the default value by allocating and zeroing */ | |
606 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
607 | if (ua_sess == NULL) { | |
608 | PERROR("malloc"); | |
ffe60014 | 609 | goto error_free; |
8b366481 DG |
610 | } |
611 | ||
612 | ua_sess->handle = -1; | |
bec39940 | 613 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
d0b96690 DG |
614 | pthread_mutex_init(&ua_sess->lock, NULL); |
615 | if (ust_registry_session_init(&ua_sess->registry, app, | |
616 | app->bits_per_long, | |
617 | app->uint8_t_alignment, | |
618 | app->uint16_t_alignment, | |
619 | app->uint32_t_alignment, | |
620 | app->uint64_t_alignment, | |
621 | app->long_alignment, | |
622 | app->byte_order)) { | |
ffe60014 DG |
623 | goto error; |
624 | } | |
625 | ||
8b366481 DG |
626 | return ua_sess; |
627 | ||
628 | error: | |
ffe60014 DG |
629 | free(ua_sess); |
630 | error_free: | |
8b366481 DG |
631 | return NULL; |
632 | } | |
633 | ||
634 | /* | |
635 | * Alloc new UST app channel. | |
636 | */ | |
637 | static | |
638 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 639 | struct ust_app_session *ua_sess, |
ffe60014 | 640 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
641 | { |
642 | struct ust_app_channel *ua_chan; | |
643 | ||
644 | /* Init most of the default value by allocating and zeroing */ | |
645 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
646 | if (ua_chan == NULL) { | |
647 | PERROR("malloc"); | |
648 | goto error; | |
649 | } | |
650 | ||
651 | /* Setup channel name */ | |
652 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
653 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
654 | ||
655 | ua_chan->enabled = 1; | |
656 | ua_chan->handle = -1; | |
45893984 | 657 | ua_chan->session = ua_sess; |
ffe60014 | 658 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
659 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
660 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
661 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
662 | |
663 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
664 | ||
45893984 DG |
665 | /* Add a channel registry to session. */ |
666 | if (ust_registry_channel_add(ua_sess->registry, ua_chan->key) < 0) { | |
667 | goto error; | |
668 | } | |
d0b96690 | 669 | |
8b366481 DG |
670 | /* Copy attributes */ |
671 | if (attr) { | |
ffe60014 | 672 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
673 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
674 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
675 | ua_chan->attr.overwrite = attr->overwrite; | |
676 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
677 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
678 | ua_chan->attr.output = attr->output; | |
8b366481 | 679 | } |
ffe60014 DG |
680 | /* By default, the channel is a per cpu channel. */ |
681 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
682 | |
683 | DBG3("UST app channel %s allocated", ua_chan->name); | |
684 | ||
685 | return ua_chan; | |
686 | ||
687 | error: | |
688 | return NULL; | |
689 | } | |
690 | ||
37f1c236 DG |
691 | /* |
692 | * Allocate and initialize a UST app stream. | |
693 | * | |
694 | * Return newly allocated stream pointer or NULL on error. | |
695 | */ | |
ffe60014 | 696 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
697 | { |
698 | struct ust_app_stream *stream = NULL; | |
699 | ||
700 | stream = zmalloc(sizeof(*stream)); | |
701 | if (stream == NULL) { | |
702 | PERROR("zmalloc ust app stream"); | |
703 | goto error; | |
704 | } | |
705 | ||
706 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
707 | stream->handle = -1; | |
708 | ||
709 | error: | |
710 | return stream; | |
711 | } | |
712 | ||
8b366481 DG |
713 | /* |
714 | * Alloc new UST app event. | |
715 | */ | |
716 | static | |
717 | struct ust_app_event *alloc_ust_app_event(char *name, | |
718 | struct lttng_ust_event *attr) | |
719 | { | |
720 | struct ust_app_event *ua_event; | |
721 | ||
722 | /* Init most of the default value by allocating and zeroing */ | |
723 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
724 | if (ua_event == NULL) { | |
725 | PERROR("malloc"); | |
726 | goto error; | |
727 | } | |
728 | ||
729 | ua_event->enabled = 1; | |
730 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
731 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 732 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
733 | |
734 | /* Copy attributes */ | |
735 | if (attr) { | |
736 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
737 | } | |
738 | ||
739 | DBG3("UST app event %s allocated", ua_event->name); | |
740 | ||
741 | return ua_event; | |
742 | ||
743 | error: | |
744 | return NULL; | |
745 | } | |
746 | ||
747 | /* | |
748 | * Alloc new UST app context. | |
749 | */ | |
750 | static | |
751 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx) | |
752 | { | |
753 | struct ust_app_ctx *ua_ctx; | |
754 | ||
755 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
756 | if (ua_ctx == NULL) { | |
757 | goto error; | |
758 | } | |
759 | ||
760 | if (uctx) { | |
761 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
762 | } | |
763 | ||
764 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
765 | ||
766 | error: | |
767 | return ua_ctx; | |
768 | } | |
769 | ||
025faf73 DG |
770 | /* |
771 | * Allocate a filter and copy the given original filter. | |
772 | * | |
773 | * Return allocated filter or NULL on error. | |
774 | */ | |
775 | static struct lttng_ust_filter_bytecode *alloc_copy_ust_app_filter( | |
776 | struct lttng_ust_filter_bytecode *orig_f) | |
777 | { | |
778 | struct lttng_ust_filter_bytecode *filter = NULL; | |
779 | ||
780 | /* Copy filter bytecode */ | |
781 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
782 | if (!filter) { | |
783 | PERROR("zmalloc alloc ust app filter"); | |
784 | goto error; | |
785 | } | |
786 | ||
787 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
788 | ||
789 | error: | |
790 | return filter; | |
791 | } | |
792 | ||
099e26bd | 793 | /* |
421cb601 DG |
794 | * Find an ust_app using the sock and return it. RCU read side lock must be |
795 | * held before calling this helper function. | |
099e26bd | 796 | */ |
8b366481 DG |
797 | static |
798 | struct ust_app *find_app_by_sock(int sock) | |
099e26bd | 799 | { |
bec39940 | 800 | struct lttng_ht_node_ulong *node; |
bec39940 | 801 | struct lttng_ht_iter iter; |
f6a9efaa | 802 | |
852d0037 | 803 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 804 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
805 | if (node == NULL) { |
806 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
807 | goto error; |
808 | } | |
852d0037 DG |
809 | |
810 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
811 | |
812 | error: | |
813 | return NULL; | |
099e26bd DG |
814 | } |
815 | ||
d0b96690 DG |
816 | /* |
817 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
818 | * be held before calling this helper function. | |
819 | */ | |
820 | static struct ust_app *find_app_by_notify_sock(int sock) | |
821 | { | |
822 | struct lttng_ht_node_ulong *node; | |
823 | struct lttng_ht_iter iter; | |
824 | ||
825 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
826 | &iter); | |
827 | node = lttng_ht_iter_get_node_ulong(&iter); | |
828 | if (node == NULL) { | |
829 | DBG2("UST app find by notify sock %d not found", sock); | |
830 | goto error; | |
831 | } | |
832 | ||
833 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
834 | ||
835 | error: | |
836 | return NULL; | |
837 | } | |
838 | ||
025faf73 DG |
839 | /* |
840 | * Lookup for an ust app event based on event name, filter bytecode and the | |
841 | * event loglevel. | |
842 | * | |
843 | * Return an ust_app_event object or NULL on error. | |
844 | */ | |
18eace3b DG |
845 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
846 | char *name, struct lttng_ust_filter_bytecode *filter, int loglevel) | |
847 | { | |
848 | struct lttng_ht_iter iter; | |
849 | struct lttng_ht_node_str *node; | |
850 | struct ust_app_event *event = NULL; | |
851 | struct ust_app_ht_key key; | |
18eace3b DG |
852 | |
853 | assert(name); | |
854 | assert(ht); | |
855 | ||
856 | /* Setup key for event lookup. */ | |
857 | key.name = name; | |
858 | key.filter = filter; | |
859 | key.loglevel = loglevel; | |
860 | ||
025faf73 DG |
861 | /* Lookup using the event name as hash and a custom match fct. */ |
862 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
863 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
864 | node = lttng_ht_iter_get_node_str(&iter); |
865 | if (node == NULL) { | |
866 | goto end; | |
867 | } | |
868 | ||
869 | event = caa_container_of(node, struct ust_app_event, node); | |
870 | ||
871 | end: | |
18eace3b DG |
872 | return event; |
873 | } | |
874 | ||
55cc08a6 DG |
875 | /* |
876 | * Create the channel context on the tracer. | |
d0b96690 DG |
877 | * |
878 | * Called with UST app session lock held. | |
55cc08a6 DG |
879 | */ |
880 | static | |
881 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
882 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
883 | { | |
884 | int ret; | |
885 | ||
840cb59c | 886 | health_code_update(); |
86acf0da | 887 | |
852d0037 | 888 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 DG |
889 | ua_chan->obj, &ua_ctx->obj); |
890 | if (ret < 0) { | |
ffe60014 DG |
891 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
892 | ERR("UST app create channel context failed for app (pid: %d) " | |
893 | "with ret %d", app->pid, ret); | |
894 | } else { | |
895 | DBG3("UST app disable event failed. Application is dead."); | |
896 | } | |
55cc08a6 DG |
897 | goto error; |
898 | } | |
899 | ||
900 | ua_ctx->handle = ua_ctx->obj->handle; | |
901 | ||
d0b96690 DG |
902 | DBG2("UST app context handle %d created successfully for channel %s", |
903 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
904 | |
905 | error: | |
840cb59c | 906 | health_code_update(); |
55cc08a6 DG |
907 | return ret; |
908 | } | |
909 | ||
53a80697 MD |
910 | /* |
911 | * Set the filter on the tracer. | |
912 | */ | |
913 | static | |
914 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
915 | struct ust_app *app) | |
916 | { | |
917 | int ret; | |
918 | ||
840cb59c | 919 | health_code_update(); |
86acf0da | 920 | |
53a80697 | 921 | if (!ua_event->filter) { |
86acf0da DG |
922 | ret = 0; |
923 | goto error; | |
53a80697 MD |
924 | } |
925 | ||
926 | ret = ustctl_set_filter(app->sock, ua_event->filter, | |
927 | ua_event->obj); | |
928 | if (ret < 0) { | |
ffe60014 DG |
929 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
930 | ERR("UST app event %s filter failed for app (pid: %d) " | |
931 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
932 | } else { | |
933 | DBG3("UST app filter event failed. Application is dead."); | |
934 | } | |
53a80697 MD |
935 | goto error; |
936 | } | |
937 | ||
938 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
939 | ||
940 | error: | |
840cb59c | 941 | health_code_update(); |
53a80697 MD |
942 | return ret; |
943 | } | |
944 | ||
9730260e DG |
945 | /* |
946 | * Disable the specified event on to UST tracer for the UST session. | |
947 | */ | |
948 | static int disable_ust_event(struct ust_app *app, | |
949 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
950 | { | |
951 | int ret; | |
952 | ||
840cb59c | 953 | health_code_update(); |
86acf0da | 954 | |
852d0037 | 955 | ret = ustctl_disable(app->sock, ua_event->obj); |
9730260e | 956 | if (ret < 0) { |
ffe60014 DG |
957 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
958 | ERR("UST app event %s disable failed for app (pid: %d) " | |
959 | "and session handle %d with ret %d", | |
960 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
961 | } else { | |
962 | DBG3("UST app disable event failed. Application is dead."); | |
963 | } | |
9730260e DG |
964 | goto error; |
965 | } | |
966 | ||
967 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 968 | ua_event->attr.name, app->pid); |
9730260e DG |
969 | |
970 | error: | |
840cb59c | 971 | health_code_update(); |
9730260e DG |
972 | return ret; |
973 | } | |
974 | ||
78f0bacd DG |
975 | /* |
976 | * Disable the specified channel on to UST tracer for the UST session. | |
977 | */ | |
978 | static int disable_ust_channel(struct ust_app *app, | |
979 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
980 | { | |
981 | int ret; | |
982 | ||
840cb59c | 983 | health_code_update(); |
86acf0da | 984 | |
852d0037 | 985 | ret = ustctl_disable(app->sock, ua_chan->obj); |
78f0bacd | 986 | if (ret < 0) { |
ffe60014 DG |
987 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
988 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
989 | "and session handle %d with ret %d", | |
990 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
991 | } else { | |
992 | DBG3("UST app disable channel failed. Application is dead."); | |
993 | } | |
78f0bacd DG |
994 | goto error; |
995 | } | |
996 | ||
78f0bacd | 997 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 998 | ua_chan->name, app->pid); |
78f0bacd DG |
999 | |
1000 | error: | |
840cb59c | 1001 | health_code_update(); |
78f0bacd DG |
1002 | return ret; |
1003 | } | |
1004 | ||
1005 | /* | |
1006 | * Enable the specified channel on to UST tracer for the UST session. | |
1007 | */ | |
1008 | static int enable_ust_channel(struct ust_app *app, | |
1009 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1010 | { | |
1011 | int ret; | |
1012 | ||
840cb59c | 1013 | health_code_update(); |
86acf0da | 1014 | |
852d0037 | 1015 | ret = ustctl_enable(app->sock, ua_chan->obj); |
78f0bacd | 1016 | if (ret < 0) { |
ffe60014 DG |
1017 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1018 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1019 | "and session handle %d with ret %d", | |
1020 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1021 | } else { | |
1022 | DBG3("UST app enable channel failed. Application is dead."); | |
1023 | } | |
78f0bacd DG |
1024 | goto error; |
1025 | } | |
1026 | ||
1027 | ua_chan->enabled = 1; | |
1028 | ||
1029 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1030 | ua_chan->name, app->pid); |
78f0bacd DG |
1031 | |
1032 | error: | |
840cb59c | 1033 | health_code_update(); |
78f0bacd DG |
1034 | return ret; |
1035 | } | |
1036 | ||
edb67388 DG |
1037 | /* |
1038 | * Enable the specified event on to UST tracer for the UST session. | |
1039 | */ | |
1040 | static int enable_ust_event(struct ust_app *app, | |
1041 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1042 | { | |
1043 | int ret; | |
1044 | ||
840cb59c | 1045 | health_code_update(); |
86acf0da | 1046 | |
852d0037 | 1047 | ret = ustctl_enable(app->sock, ua_event->obj); |
edb67388 | 1048 | if (ret < 0) { |
ffe60014 DG |
1049 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1050 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1051 | "and session handle %d with ret %d", | |
1052 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1053 | } else { | |
1054 | DBG3("UST app enable event failed. Application is dead."); | |
1055 | } | |
edb67388 DG |
1056 | goto error; |
1057 | } | |
1058 | ||
1059 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1060 | ua_event->attr.name, app->pid); |
edb67388 DG |
1061 | |
1062 | error: | |
840cb59c | 1063 | health_code_update(); |
edb67388 DG |
1064 | return ret; |
1065 | } | |
1066 | ||
099e26bd | 1067 | /* |
d88aee68 DG |
1068 | * Create the specified channel onto the UST tracer for a UST session. This |
1069 | * MUST be called with UST app session lock held. | |
4f3ab6ee | 1070 | * |
ffe60014 | 1071 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1072 | */ |
ffe60014 DG |
1073 | static int create_ust_channel(struct ust_app *app, |
1074 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
1075 | struct consumer_output *consumer) | |
4f3ab6ee DG |
1076 | { |
1077 | int ret; | |
ffe60014 DG |
1078 | unsigned int nb_fd = 0; |
1079 | struct consumer_socket *socket; | |
1080 | struct ust_app_stream *stream, *stmp; | |
4f3ab6ee DG |
1081 | |
1082 | assert(app); | |
ffe60014 | 1083 | assert(ua_sess); |
4f3ab6ee | 1084 | assert(ua_chan); |
ffe60014 | 1085 | assert(consumer); |
4f3ab6ee | 1086 | |
d88aee68 | 1087 | rcu_read_lock(); |
840cb59c | 1088 | health_code_update(); |
4f3ab6ee | 1089 | |
ffe60014 DG |
1090 | /* Get the right consumer socket for the application. */ |
1091 | socket = find_consumer_socket_by_bitness(app->bits_per_long, consumer); | |
1092 | if (!socket) { | |
4f3ab6ee DG |
1093 | ret = -1; |
1094 | goto error; | |
1095 | } | |
1096 | ||
ffe60014 DG |
1097 | health_code_update(); |
1098 | ||
7f133705 | 1099 | /* |
ffe60014 DG |
1100 | * Ask consumer to create channel. The consumer will return the number of |
1101 | * stream we have to expect. | |
7f133705 | 1102 | */ |
ffe60014 | 1103 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, consumer, socket); |
7f133705 | 1104 | if (ret < 0) { |
7f133705 DG |
1105 | goto error; |
1106 | } | |
1107 | ||
ffe60014 DG |
1108 | /* |
1109 | * Compute the number of fd needed before receiving them. It must be 2 per | |
d88aee68 | 1110 | * stream (2 being the default value here). |
ffe60014 DG |
1111 | */ |
1112 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
1113 | ||
1114 | /* Reserve the amount of file descriptor we need. */ | |
1115 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
4f3ab6ee | 1116 | if (ret < 0) { |
ffe60014 DG |
1117 | ERR("Exhausted number of available FD upon create channel"); |
1118 | goto error_fd_get; | |
4f3ab6ee DG |
1119 | } |
1120 | ||
840cb59c | 1121 | health_code_update(); |
4f3ab6ee | 1122 | |
ffe60014 DG |
1123 | /* |
1124 | * Now get the channel from the consumer. This call wil populate the stream | |
1125 | * list of that channel and set the ust object. | |
1126 | */ | |
1127 | ret = ust_consumer_get_channel(socket, ua_chan); | |
4063050c | 1128 | if (ret < 0) { |
ffe60014 | 1129 | goto error_destroy; |
4063050c | 1130 | } |
86acf0da | 1131 | |
ffe60014 DG |
1132 | /* Send channel to the application. */ |
1133 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
5b4a0ec0 | 1134 | if (ret < 0) { |
b551a063 DG |
1135 | goto error; |
1136 | } | |
1137 | ||
d88aee68 DG |
1138 | health_code_update(); |
1139 | ||
ffe60014 DG |
1140 | /* Send all streams to application. */ |
1141 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1142 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
1143 | if (ret < 0) { | |
1144 | goto error; | |
1145 | } | |
1146 | /* We don't need the stream anymore once sent to the tracer. */ | |
1147 | cds_list_del(&stream->list); | |
1148 | delete_ust_app_stream(-1, stream); | |
1149 | } | |
b551a063 | 1150 | |
ffe60014 DG |
1151 | /* Flag the channel that it is sent to the application. */ |
1152 | ua_chan->is_sent = 1; | |
d0b96690 DG |
1153 | /* Initialize ust objd object using the received handle and add it. */ |
1154 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
1155 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
b551a063 | 1156 | |
840cb59c | 1157 | health_code_update(); |
86acf0da | 1158 | |
8535a6d9 DG |
1159 | /* If channel is not enabled, disable it on the tracer */ |
1160 | if (!ua_chan->enabled) { | |
1161 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
1162 | if (ret < 0) { | |
1163 | goto error; | |
1164 | } | |
1165 | } | |
1166 | ||
d88aee68 | 1167 | rcu_read_unlock(); |
ffe60014 DG |
1168 | return 0; |
1169 | ||
1170 | error_destroy: | |
1171 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
1172 | error_fd_get: | |
1173 | /* | |
1174 | * Initiate a destroy channel on the consumer since we had an error | |
1175 | * handling it on our side. The return value is of no importance since we | |
1176 | * already have a ret value set by the previous error that we need to | |
1177 | * return. | |
1178 | */ | |
1179 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
b551a063 | 1180 | error: |
840cb59c | 1181 | health_code_update(); |
d88aee68 | 1182 | rcu_read_unlock(); |
b551a063 DG |
1183 | return ret; |
1184 | } | |
1185 | ||
91d76f53 | 1186 | /* |
5b4a0ec0 | 1187 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1188 | * |
1189 | * Should be called with session mutex held. | |
91d76f53 | 1190 | */ |
edb67388 DG |
1191 | static |
1192 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1193 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1194 | { |
5b4a0ec0 | 1195 | int ret = 0; |
284d8f55 | 1196 | |
840cb59c | 1197 | health_code_update(); |
86acf0da | 1198 | |
5b4a0ec0 | 1199 | /* Create UST event on tracer */ |
852d0037 | 1200 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 DG |
1201 | &ua_event->obj); |
1202 | if (ret < 0) { | |
ffe60014 DG |
1203 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1204 | ERR("Error ustctl create event %s for app pid: %d with ret %d", | |
1205 | ua_event->attr.name, app->pid, ret); | |
1206 | } else { | |
1207 | DBG3("UST app create event failed. Application is dead."); | |
1208 | } | |
5b4a0ec0 | 1209 | goto error; |
91d76f53 | 1210 | } |
f6a9efaa | 1211 | |
5b4a0ec0 | 1212 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1213 | |
5b4a0ec0 | 1214 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1215 | ua_event->attr.name, app->pid); |
f6a9efaa | 1216 | |
840cb59c | 1217 | health_code_update(); |
86acf0da | 1218 | |
025faf73 DG |
1219 | /* Set filter if one is present. */ |
1220 | if (ua_event->filter) { | |
1221 | ret = set_ust_event_filter(ua_event, app); | |
1222 | if (ret < 0) { | |
1223 | goto error; | |
1224 | } | |
1225 | } | |
1226 | ||
8535a6d9 | 1227 | /* If event not enabled, disable it on the tracer */ |
fc34caaa | 1228 | if (ua_event->enabled == 0) { |
8535a6d9 DG |
1229 | ret = disable_ust_event(app, ua_sess, ua_event); |
1230 | if (ret < 0) { | |
fc34caaa DG |
1231 | /* |
1232 | * If we hit an EPERM, something is wrong with our disable call. If | |
1233 | * we get an EEXIST, there is a problem on the tracer side since we | |
1234 | * just created it. | |
1235 | */ | |
1236 | switch (ret) { | |
49c336c1 | 1237 | case -LTTNG_UST_ERR_PERM: |
fc34caaa DG |
1238 | /* Code flow problem */ |
1239 | assert(0); | |
49c336c1 | 1240 | case -LTTNG_UST_ERR_EXIST: |
fc34caaa DG |
1241 | /* It's OK for our use case. */ |
1242 | ret = 0; | |
1243 | break; | |
1244 | default: | |
1245 | break; | |
1246 | } | |
8535a6d9 DG |
1247 | goto error; |
1248 | } | |
1249 | } | |
1250 | ||
5b4a0ec0 | 1251 | error: |
840cb59c | 1252 | health_code_update(); |
5b4a0ec0 | 1253 | return ret; |
91d76f53 | 1254 | } |
48842b30 | 1255 | |
5b4a0ec0 DG |
1256 | /* |
1257 | * Copy data between an UST app event and a LTT event. | |
1258 | */ | |
421cb601 | 1259 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1260 | struct ltt_ust_event *uevent) |
1261 | { | |
1262 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); | |
1263 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1264 | ||
fc34caaa DG |
1265 | ua_event->enabled = uevent->enabled; |
1266 | ||
5b4a0ec0 DG |
1267 | /* Copy event attributes */ |
1268 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1269 | ||
53a80697 MD |
1270 | /* Copy filter bytecode */ |
1271 | if (uevent->filter) { | |
025faf73 DG |
1272 | ua_event->filter = alloc_copy_ust_app_filter(uevent->filter); |
1273 | /* Filter might be NULL here in case of ENONEM. */ | |
53a80697 | 1274 | } |
48842b30 DG |
1275 | } |
1276 | ||
5b4a0ec0 DG |
1277 | /* |
1278 | * Copy data between an UST app channel and a LTT channel. | |
1279 | */ | |
421cb601 | 1280 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1281 | struct ltt_ust_channel *uchan) |
1282 | { | |
bec39940 | 1283 | struct lttng_ht_iter iter; |
48842b30 | 1284 | struct ltt_ust_event *uevent; |
55cc08a6 | 1285 | struct ltt_ust_context *uctx; |
48842b30 | 1286 | struct ust_app_event *ua_event; |
55cc08a6 | 1287 | struct ust_app_ctx *ua_ctx; |
48842b30 | 1288 | |
fc34caaa | 1289 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1290 | |
1291 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1292 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 DG |
1293 | |
1294 | /* Copy event attributes since the layout is different. */ | |
1295 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1296 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1297 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1298 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1299 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
1300 | ua_chan->attr.output = uchan->attr.output; | |
1301 | /* | |
1302 | * Note that the attribute channel type is not set since the channel on the | |
1303 | * tracing registry side does not have this information. | |
1304 | */ | |
48842b30 | 1305 | |
fc34caaa DG |
1306 | ua_chan->enabled = uchan->enabled; |
1307 | ||
bec39940 | 1308 | cds_lfht_for_each_entry(uchan->ctx->ht, &iter.iter, uctx, node.node) { |
55cc08a6 DG |
1309 | ua_ctx = alloc_ust_app_ctx(&uctx->ctx); |
1310 | if (ua_ctx == NULL) { | |
1311 | continue; | |
1312 | } | |
bec39940 DG |
1313 | lttng_ht_node_init_ulong(&ua_ctx->node, |
1314 | (unsigned long) ua_ctx->ctx.ctx); | |
1315 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
55cc08a6 | 1316 | } |
48842b30 | 1317 | |
421cb601 | 1318 | /* Copy all events from ltt ust channel to ust app channel */ |
bec39940 | 1319 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
18eace3b DG |
1320 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
1321 | uevent->filter, uevent->attr.loglevel); | |
1322 | if (ua_event == NULL) { | |
421cb601 | 1323 | DBG2("UST event %s not found on shadow copy channel", |
48842b30 | 1324 | uevent->attr.name); |
284d8f55 | 1325 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
48842b30 | 1326 | if (ua_event == NULL) { |
5b4a0ec0 | 1327 | continue; |
48842b30 | 1328 | } |
421cb601 | 1329 | shadow_copy_event(ua_event, uevent); |
d0b96690 | 1330 | add_unique_ust_app_event(ua_chan, ua_event); |
48842b30 | 1331 | } |
48842b30 DG |
1332 | } |
1333 | ||
fc34caaa | 1334 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1335 | } |
1336 | ||
5b4a0ec0 DG |
1337 | /* |
1338 | * Copy data between a UST app session and a regular LTT session. | |
1339 | */ | |
421cb601 | 1340 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1341 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1342 | { |
bec39940 DG |
1343 | struct lttng_ht_node_str *ua_chan_node; |
1344 | struct lttng_ht_iter iter; | |
48842b30 DG |
1345 | struct ltt_ust_channel *uchan; |
1346 | struct ust_app_channel *ua_chan; | |
477d7741 MD |
1347 | time_t rawtime; |
1348 | struct tm *timeinfo; | |
1349 | char datetime[16]; | |
1350 | int ret; | |
1351 | ||
1352 | /* Get date and time for unique app path */ | |
1353 | time(&rawtime); | |
1354 | timeinfo = localtime(&rawtime); | |
1355 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1356 | |
421cb601 | 1357 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1358 | |
a991f516 | 1359 | ua_sess->id = usess->id; |
6df2e2c9 MD |
1360 | ua_sess->uid = usess->uid; |
1361 | ua_sess->gid = usess->gid; | |
48842b30 | 1362 | |
00e2e675 DG |
1363 | ret = snprintf(ua_sess->path, PATH_MAX, "%s-%d-%s/", app->name, app->pid, |
1364 | datetime); | |
477d7741 MD |
1365 | if (ret < 0) { |
1366 | PERROR("asprintf UST shadow copy session"); | |
1367 | /* TODO: We cannot return an error from here.. */ | |
1368 | assert(0); | |
1369 | } | |
1370 | ||
48842b30 DG |
1371 | /* TODO: support all UST domain */ |
1372 | ||
1373 | /* Iterate over all channels in global domain. */ | |
bec39940 DG |
1374 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, |
1375 | uchan, node.node) { | |
1376 | struct lttng_ht_iter uiter; | |
ba767faf | 1377 | |
bec39940 DG |
1378 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
1379 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
5b4a0ec0 | 1380 | if (ua_chan_node != NULL) { |
fc34caaa | 1381 | /* Session exist. Contiuing. */ |
5b4a0ec0 DG |
1382 | continue; |
1383 | } | |
421cb601 | 1384 | |
5b4a0ec0 DG |
1385 | DBG2("Channel %s not found on shadow session copy, creating it", |
1386 | uchan->name); | |
d0b96690 | 1387 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
5b4a0ec0 | 1388 | if (ua_chan == NULL) { |
fc34caaa | 1389 | /* malloc failed FIXME: Might want to do handle ENOMEM .. */ |
5b4a0ec0 | 1390 | continue; |
48842b30 | 1391 | } |
5b4a0ec0 | 1392 | shadow_copy_channel(ua_chan, uchan); |
ffe60014 DG |
1393 | /* |
1394 | * The concept of metadata channel does not exist on the tracing | |
1395 | * registry side of the session daemon so this can only be a per CPU | |
1396 | * channel and not metadata. | |
1397 | */ | |
1398 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
1399 | ||
bec39940 | 1400 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); |
48842b30 DG |
1401 | } |
1402 | } | |
1403 | ||
78f0bacd DG |
1404 | /* |
1405 | * Lookup sesison wrapper. | |
1406 | */ | |
84cd17c6 MD |
1407 | static |
1408 | void __lookup_session_by_app(struct ltt_ust_session *usess, | |
bec39940 | 1409 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1410 | { |
1411 | /* Get right UST app session from app */ | |
2c348c10 | 1412 | lttng_ht_lookup(app->sessions, (void *)((unsigned long) usess->id), iter); |
84cd17c6 MD |
1413 | } |
1414 | ||
421cb601 DG |
1415 | /* |
1416 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1417 | * id. |
421cb601 | 1418 | */ |
48842b30 DG |
1419 | static struct ust_app_session *lookup_session_by_app( |
1420 | struct ltt_ust_session *usess, struct ust_app *app) | |
1421 | { | |
bec39940 DG |
1422 | struct lttng_ht_iter iter; |
1423 | struct lttng_ht_node_ulong *node; | |
48842b30 | 1424 | |
84cd17c6 | 1425 | __lookup_session_by_app(usess, app, &iter); |
bec39940 | 1426 | node = lttng_ht_iter_get_node_ulong(&iter); |
48842b30 DG |
1427 | if (node == NULL) { |
1428 | goto error; | |
1429 | } | |
1430 | ||
1431 | return caa_container_of(node, struct ust_app_session, node); | |
1432 | ||
1433 | error: | |
1434 | return NULL; | |
1435 | } | |
1436 | ||
421cb601 | 1437 | /* |
3d8ca23b | 1438 | * Create a session on the tracer side for the given app. |
421cb601 | 1439 | * |
3d8ca23b DG |
1440 | * On success, ua_sess_ptr is populated with the session pointer or else left |
1441 | * untouched. If the session was created, is_created is set to 1. On error, | |
1442 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
1443 | * be NULL. | |
1444 | * | |
1445 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
1446 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 1447 | */ |
3d8ca23b DG |
1448 | static int create_ust_app_session(struct ltt_ust_session *usess, |
1449 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, | |
1450 | int *is_created) | |
421cb601 | 1451 | { |
3d8ca23b | 1452 | int ret, created = 0; |
421cb601 DG |
1453 | struct ust_app_session *ua_sess; |
1454 | ||
3d8ca23b DG |
1455 | assert(usess); |
1456 | assert(app); | |
1457 | assert(ua_sess_ptr); | |
1458 | ||
840cb59c | 1459 | health_code_update(); |
86acf0da | 1460 | |
421cb601 DG |
1461 | ua_sess = lookup_session_by_app(usess, app); |
1462 | if (ua_sess == NULL) { | |
a991f516 | 1463 | DBG2("UST app pid: %d session id %d not found, creating it", |
852d0037 | 1464 | app->pid, usess->id); |
d0b96690 | 1465 | ua_sess = alloc_ust_app_session(app); |
421cb601 DG |
1466 | if (ua_sess == NULL) { |
1467 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
1468 | ret = -ENOMEM; |
1469 | goto error; | |
421cb601 | 1470 | } |
477d7741 | 1471 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 1472 | created = 1; |
421cb601 DG |
1473 | } |
1474 | ||
840cb59c | 1475 | health_code_update(); |
86acf0da | 1476 | |
421cb601 | 1477 | if (ua_sess->handle == -1) { |
852d0037 | 1478 | ret = ustctl_create_session(app->sock); |
421cb601 | 1479 | if (ret < 0) { |
ffe60014 DG |
1480 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1481 | ERR("Creating session for app pid %d with ret %d", | |
1482 | app->pid, ret); | |
1483 | } else { | |
1484 | DBG("UST app creating session failed. Application is dead"); | |
1485 | } | |
d0b96690 | 1486 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
1487 | if (ret != -ENOMEM) { |
1488 | /* | |
1489 | * Tracer is probably gone or got an internal error so let's | |
1490 | * behave like it will soon unregister or not usable. | |
1491 | */ | |
1492 | ret = -ENOTCONN; | |
1493 | } | |
1494 | goto error; | |
421cb601 DG |
1495 | } |
1496 | ||
421cb601 DG |
1497 | ua_sess->handle = ret; |
1498 | ||
1499 | /* Add ust app session to app's HT */ | |
2c348c10 | 1500 | lttng_ht_node_init_ulong(&ua_sess->node, (unsigned long) ua_sess->id); |
bec39940 | 1501 | lttng_ht_add_unique_ulong(app->sessions, &ua_sess->node); |
421cb601 DG |
1502 | |
1503 | DBG2("UST app session created successfully with handle %d", ret); | |
1504 | } | |
1505 | ||
d88aee68 DG |
1506 | /* |
1507 | * Assign consumer if not already set. For one application, there is only | |
1508 | * one possible consumer has of now. | |
1509 | */ | |
1510 | if (!ua_sess->consumer) { | |
1511 | ua_sess->consumer = usess->consumer; | |
1512 | } | |
1513 | ||
3d8ca23b DG |
1514 | *ua_sess_ptr = ua_sess; |
1515 | if (is_created) { | |
1516 | *is_created = created; | |
1517 | } | |
d88aee68 | 1518 | |
3d8ca23b DG |
1519 | /* Everything went well. */ |
1520 | ret = 0; | |
1521 | ||
1522 | error: | |
840cb59c | 1523 | health_code_update(); |
3d8ca23b | 1524 | return ret; |
421cb601 DG |
1525 | } |
1526 | ||
55cc08a6 DG |
1527 | /* |
1528 | * Create a context for the channel on the tracer. | |
d0b96690 DG |
1529 | * |
1530 | * Called with UST app session lock held. | |
55cc08a6 DG |
1531 | */ |
1532 | static | |
1533 | int create_ust_app_channel_context(struct ust_app_session *ua_sess, | |
1534 | struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx, | |
1535 | struct ust_app *app) | |
1536 | { | |
1537 | int ret = 0; | |
bec39940 DG |
1538 | struct lttng_ht_iter iter; |
1539 | struct lttng_ht_node_ulong *node; | |
55cc08a6 DG |
1540 | struct ust_app_ctx *ua_ctx; |
1541 | ||
1542 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
1543 | ||
bec39940 DG |
1544 | lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter); |
1545 | node = lttng_ht_iter_get_node_ulong(&iter); | |
55cc08a6 DG |
1546 | if (node != NULL) { |
1547 | ret = -EEXIST; | |
1548 | goto error; | |
1549 | } | |
1550 | ||
1551 | ua_ctx = alloc_ust_app_ctx(uctx); | |
1552 | if (ua_ctx == NULL) { | |
1553 | /* malloc failed */ | |
1554 | ret = -1; | |
1555 | goto error; | |
1556 | } | |
1557 | ||
bec39940 DG |
1558 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); |
1559 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
55cc08a6 DG |
1560 | |
1561 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
1562 | if (ret < 0) { | |
1563 | goto error; | |
1564 | } | |
1565 | ||
1566 | error: | |
1567 | return ret; | |
1568 | } | |
1569 | ||
edb67388 DG |
1570 | /* |
1571 | * Enable on the tracer side a ust app event for the session and channel. | |
d0b96690 DG |
1572 | * |
1573 | * Called with UST app session lock held. | |
edb67388 DG |
1574 | */ |
1575 | static | |
1576 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
35a9059d | 1577 | struct ust_app_event *ua_event, struct ust_app *app) |
edb67388 DG |
1578 | { |
1579 | int ret; | |
1580 | ||
1581 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1582 | if (ret < 0) { | |
1583 | goto error; | |
1584 | } | |
1585 | ||
1586 | ua_event->enabled = 1; | |
1587 | ||
1588 | error: | |
1589 | return ret; | |
1590 | } | |
1591 | ||
9730260e DG |
1592 | /* |
1593 | * Disable on the tracer side a ust app event for the session and channel. | |
1594 | */ | |
1595 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
7f79d3a1 | 1596 | struct ust_app_event *ua_event, struct ust_app *app) |
9730260e DG |
1597 | { |
1598 | int ret; | |
1599 | ||
1600 | ret = disable_ust_event(app, ua_sess, ua_event); | |
1601 | if (ret < 0) { | |
1602 | goto error; | |
1603 | } | |
1604 | ||
1605 | ua_event->enabled = 0; | |
1606 | ||
1607 | error: | |
1608 | return ret; | |
1609 | } | |
1610 | ||
78f0bacd DG |
1611 | /* |
1612 | * Lookup ust app channel for session and disable it on the tracer side. | |
1613 | */ | |
8535a6d9 DG |
1614 | static |
1615 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
1616 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
78f0bacd | 1617 | { |
8535a6d9 | 1618 | int ret; |
78f0bacd DG |
1619 | |
1620 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
1621 | if (ret < 0) { | |
1622 | goto error; | |
1623 | } | |
1624 | ||
8535a6d9 DG |
1625 | ua_chan->enabled = 0; |
1626 | ||
78f0bacd DG |
1627 | error: |
1628 | return ret; | |
1629 | } | |
1630 | ||
1631 | /* | |
1632 | * Lookup ust app channel for session and enable it on the tracer side. | |
1633 | */ | |
1634 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
1635 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
1636 | { | |
1637 | int ret = 0; | |
bec39940 DG |
1638 | struct lttng_ht_iter iter; |
1639 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
1640 | struct ust_app_channel *ua_chan; |
1641 | ||
bec39940 DG |
1642 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
1643 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
78f0bacd | 1644 | if (ua_chan_node == NULL) { |
a991f516 MD |
1645 | DBG2("Unable to find channel %s in ust session id %u", |
1646 | uchan->name, ua_sess->id); | |
78f0bacd DG |
1647 | goto error; |
1648 | } | |
1649 | ||
1650 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
1651 | ||
1652 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
1653 | if (ret < 0) { | |
1654 | goto error; | |
1655 | } | |
1656 | ||
1657 | error: | |
1658 | return ret; | |
1659 | } | |
1660 | ||
284d8f55 | 1661 | /* |
4d710ac2 DG |
1662 | * Create UST app channel and create it on the tracer. Set ua_chanp of the |
1663 | * newly created channel if not NULL. | |
d0b96690 DG |
1664 | * |
1665 | * Called with UST app session lock held. | |
284d8f55 | 1666 | */ |
4d710ac2 DG |
1667 | static int create_ust_app_channel(struct ust_app_session *ua_sess, |
1668 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
ffe60014 | 1669 | struct consumer_output *consumer, enum lttng_ust_chan_type type, |
4d710ac2 | 1670 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
1671 | { |
1672 | int ret = 0; | |
bec39940 DG |
1673 | struct lttng_ht_iter iter; |
1674 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
1675 | struct ust_app_channel *ua_chan; |
1676 | ||
1677 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
1678 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
1679 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 1680 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 1681 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 1682 | goto end; |
5b4a0ec0 DG |
1683 | } |
1684 | ||
d0b96690 | 1685 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
1686 | if (ua_chan == NULL) { |
1687 | /* Only malloc can fail here */ | |
4d710ac2 | 1688 | ret = -ENOMEM; |
fc34caaa DG |
1689 | goto error; |
1690 | } | |
1691 | shadow_copy_channel(ua_chan, uchan); | |
1692 | ||
ffe60014 DG |
1693 | /* Set channel type. */ |
1694 | ua_chan->attr.type = type; | |
1695 | ||
1696 | ret = create_ust_channel(app, ua_sess, ua_chan, consumer); | |
5b4a0ec0 DG |
1697 | if (ret < 0) { |
1698 | goto error; | |
1699 | } | |
1700 | ||
fc34caaa | 1701 | DBG2("UST app create channel %s for PID %d completed", ua_chan->name, |
852d0037 | 1702 | app->pid); |
fc34caaa | 1703 | |
d0b96690 DG |
1704 | /* Only add the channel if successful on the tracer side. */ |
1705 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
1706 | ||
fc34caaa | 1707 | end: |
4d710ac2 DG |
1708 | if (ua_chanp) { |
1709 | *ua_chanp = ua_chan; | |
1710 | } | |
1711 | ||
1712 | /* Everything went well. */ | |
1713 | return 0; | |
5b4a0ec0 DG |
1714 | |
1715 | error: | |
d0b96690 | 1716 | delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app); |
4d710ac2 | 1717 | return ret; |
5b4a0ec0 DG |
1718 | } |
1719 | ||
1720 | /* | |
1721 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
1722 | * |
1723 | * Called with ust app session mutex held. | |
5b4a0ec0 | 1724 | */ |
edb67388 DG |
1725 | static |
1726 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
1727 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
1728 | struct ust_app *app) | |
284d8f55 | 1729 | { |
edb67388 | 1730 | int ret = 0; |
5b4a0ec0 | 1731 | struct ust_app_event *ua_event; |
284d8f55 | 1732 | |
5b4a0ec0 | 1733 | /* Get event node */ |
18eace3b DG |
1734 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
1735 | uevent->filter, uevent->attr.loglevel); | |
1736 | if (ua_event != NULL) { | |
fc34caaa | 1737 | ret = -EEXIST; |
edb67388 DG |
1738 | goto end; |
1739 | } | |
5b4a0ec0 | 1740 | |
edb67388 DG |
1741 | /* Does not exist so create one */ |
1742 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); | |
1743 | if (ua_event == NULL) { | |
1744 | /* Only malloc can failed so something is really wrong */ | |
1745 | ret = -ENOMEM; | |
fc34caaa | 1746 | goto end; |
5b4a0ec0 | 1747 | } |
edb67388 | 1748 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 1749 | |
edb67388 | 1750 | /* Create it on the tracer side */ |
5b4a0ec0 | 1751 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 1752 | if (ret < 0) { |
fc34caaa | 1753 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 1754 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
1755 | goto error; |
1756 | } | |
1757 | ||
d0b96690 | 1758 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 1759 | |
fc34caaa | 1760 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 1761 | app->pid); |
7f79d3a1 | 1762 | |
edb67388 | 1763 | end: |
fc34caaa DG |
1764 | return ret; |
1765 | ||
5b4a0ec0 | 1766 | error: |
fc34caaa DG |
1767 | /* Valid. Calling here is already in a read side lock */ |
1768 | delete_ust_app_event(-1, ua_event); | |
edb67388 | 1769 | return ret; |
5b4a0ec0 DG |
1770 | } |
1771 | ||
1772 | /* | |
1773 | * Create UST metadata and open it on the tracer side. | |
d0b96690 DG |
1774 | * |
1775 | * Called with UST app session lock held. | |
5b4a0ec0 DG |
1776 | */ |
1777 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
ffe60014 | 1778 | struct ust_app *app, struct consumer_output *consumer) |
5b4a0ec0 DG |
1779 | { |
1780 | int ret = 0; | |
ffe60014 | 1781 | struct ust_app_channel *metadata; |
d88aee68 | 1782 | struct consumer_socket *socket; |
5b4a0ec0 | 1783 | |
ffe60014 DG |
1784 | assert(ua_sess); |
1785 | assert(app); | |
d88aee68 | 1786 | assert(consumer); |
5b4a0ec0 | 1787 | |
ffe60014 DG |
1788 | if (ua_sess->metadata) { |
1789 | /* Already exist. Return success. */ | |
1790 | goto end; | |
5b4a0ec0 DG |
1791 | } |
1792 | ||
ffe60014 | 1793 | /* Allocate UST metadata */ |
d0b96690 | 1794 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
1795 | if (!metadata) { |
1796 | /* malloc() failed */ | |
1797 | ret = -ENOMEM; | |
1798 | goto error; | |
1799 | } | |
5b4a0ec0 | 1800 | |
ffe60014 DG |
1801 | /* Set default attributes for metadata. */ |
1802 | metadata->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
1803 | metadata->attr.subbuf_size = default_get_metadata_subbuf_size(); | |
1804 | metadata->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM; | |
6bb9e85f MD |
1805 | metadata->attr.switch_timer_interval = DEFAULT_UST_CHANNEL_SWITCH_TIMER; |
1806 | metadata->attr.read_timer_interval = DEFAULT_UST_CHANNEL_READ_TIMER; | |
ffe60014 DG |
1807 | metadata->attr.output = LTTNG_UST_MMAP; |
1808 | metadata->attr.type = LTTNG_UST_CHAN_METADATA; | |
5b4a0ec0 | 1809 | |
d88aee68 DG |
1810 | /* Get the right consumer socket for the application. */ |
1811 | socket = find_consumer_socket_by_bitness(app->bits_per_long, consumer); | |
1812 | if (!socket) { | |
1813 | ret = -EINVAL; | |
1814 | goto error_consumer; | |
1815 | } | |
1816 | ||
1817 | /* | |
1818 | * Ask the metadata channel creation to the consumer. The metadata object | |
1819 | * will be created by the consumer and kept their. However, the stream is | |
1820 | * never added or monitored until we do a first push metadata to the | |
1821 | * consumer. | |
1822 | */ | |
1823 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket); | |
1824 | if (ret < 0) { | |
1825 | goto error_consumer; | |
1826 | } | |
1827 | ||
1828 | /* | |
1829 | * The setup command will make the metadata stream be sent to the relayd, | |
1830 | * if applicable, and the thread managing the metadatas. This is important | |
1831 | * because after this point, if an error occurs, the only way the stream | |
1832 | * can be deleted is to be monitored in the consumer. | |
1833 | */ | |
1834 | ret = ust_consumer_setup_metadata(socket, metadata); | |
ffe60014 | 1835 | if (ret < 0) { |
d88aee68 | 1836 | goto error_consumer; |
5b4a0ec0 DG |
1837 | } |
1838 | ||
ffe60014 DG |
1839 | ua_sess->metadata = metadata; |
1840 | ||
d88aee68 | 1841 | DBG2("UST metadata created for app pid %d", app->pid); |
5b4a0ec0 | 1842 | |
ffe60014 DG |
1843 | end: |
1844 | return 0; | |
d88aee68 DG |
1845 | error_consumer: |
1846 | delete_ust_app_channel(-1, metadata, app); | |
5b4a0ec0 | 1847 | error: |
ffe60014 | 1848 | return ret; |
5b4a0ec0 DG |
1849 | } |
1850 | ||
1851 | /* | |
1852 | * Return pointer to traceable apps list. | |
1853 | */ | |
bec39940 | 1854 | struct lttng_ht *ust_app_get_ht(void) |
5b4a0ec0 DG |
1855 | { |
1856 | return ust_app_ht; | |
1857 | } | |
1858 | ||
1859 | /* | |
d88aee68 DG |
1860 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
1861 | * acquired before calling this function. | |
5b4a0ec0 DG |
1862 | */ |
1863 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
1864 | { | |
d88aee68 | 1865 | struct ust_app *app = NULL; |
bec39940 DG |
1866 | struct lttng_ht_node_ulong *node; |
1867 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 1868 | |
bec39940 DG |
1869 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
1870 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
1871 | if (node == NULL) { |
1872 | DBG2("UST app no found with pid %d", pid); | |
1873 | goto error; | |
1874 | } | |
5b4a0ec0 DG |
1875 | |
1876 | DBG2("Found UST app by pid %d", pid); | |
1877 | ||
d88aee68 | 1878 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
1879 | |
1880 | error: | |
d88aee68 | 1881 | return app; |
5b4a0ec0 DG |
1882 | } |
1883 | ||
d88aee68 DG |
1884 | /* |
1885 | * Allocate and init an UST app object using the registration information and | |
1886 | * the command socket. This is called when the command socket connects to the | |
1887 | * session daemon. | |
1888 | * | |
1889 | * The object is returned on success or else NULL. | |
1890 | */ | |
d0b96690 | 1891 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 1892 | { |
d0b96690 DG |
1893 | struct ust_app *lta = NULL; |
1894 | ||
1895 | assert(msg); | |
1896 | assert(sock >= 0); | |
1897 | ||
1898 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 1899 | |
173af62f DG |
1900 | if ((msg->bits_per_long == 64 && |
1901 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
1902 | || (msg->bits_per_long == 32 && | |
1903 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 1904 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
1905 | "%d-bit long, but no consumerd for this size is available.\n", |
1906 | msg->name, msg->pid, msg->bits_per_long); | |
1907 | goto error; | |
3f2c5fcc | 1908 | } |
d0b96690 | 1909 | |
5b4a0ec0 DG |
1910 | lta = zmalloc(sizeof(struct ust_app)); |
1911 | if (lta == NULL) { | |
1912 | PERROR("malloc"); | |
d0b96690 | 1913 | goto error; |
5b4a0ec0 DG |
1914 | } |
1915 | ||
1916 | lta->ppid = msg->ppid; | |
1917 | lta->uid = msg->uid; | |
1918 | lta->gid = msg->gid; | |
d0b96690 | 1919 | |
7753dea8 | 1920 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
1921 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
1922 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
1923 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
1924 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
1925 | lta->long_alignment = msg->long_alignment; | |
1926 | lta->byte_order = msg->byte_order; | |
1927 | ||
5b4a0ec0 DG |
1928 | lta->v_major = msg->major; |
1929 | lta->v_minor = msg->minor; | |
bec39940 | 1930 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 DG |
1931 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
1932 | lta->notify_sock = -1; | |
d88aee68 DG |
1933 | |
1934 | /* Copy name and make sure it's NULL terminated. */ | |
1935 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
1936 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
1937 | ||
1938 | /* | |
1939 | * Before this can be called, when receiving the registration information, | |
1940 | * the application compatibility is checked. So, at this point, the | |
1941 | * application can work with this session daemon. | |
1942 | */ | |
d0b96690 | 1943 | lta->compatible = 1; |
5b4a0ec0 | 1944 | |
852d0037 | 1945 | lta->pid = msg->pid; |
d0b96690 | 1946 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 1947 | lta->sock = sock; |
d0b96690 | 1948 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 1949 | |
d42f20df DG |
1950 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
1951 | ||
d0b96690 DG |
1952 | error: |
1953 | return lta; | |
1954 | } | |
1955 | ||
d88aee68 DG |
1956 | /* |
1957 | * For a given application object, add it to every hash table. | |
1958 | */ | |
d0b96690 DG |
1959 | void ust_app_add(struct ust_app *app) |
1960 | { | |
1961 | assert(app); | |
1962 | assert(app->notify_sock >= 0); | |
1963 | ||
5b4a0ec0 | 1964 | rcu_read_lock(); |
852d0037 DG |
1965 | |
1966 | /* | |
1967 | * On a re-registration, we want to kick out the previous registration of | |
1968 | * that pid | |
1969 | */ | |
d0b96690 | 1970 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
1971 | |
1972 | /* | |
1973 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
1974 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
1975 | * already in the table. | |
1976 | */ | |
d0b96690 | 1977 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 1978 | |
d0b96690 DG |
1979 | /* Add application to the notify socket hash table. */ |
1980 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
1981 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 1982 | |
d0b96690 | 1983 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
1984 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
1985 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
1986 | app->v_minor); | |
5b4a0ec0 | 1987 | |
d0b96690 DG |
1988 | rcu_read_unlock(); |
1989 | } | |
1990 | ||
d88aee68 DG |
1991 | /* |
1992 | * Set the application version into the object. | |
1993 | * | |
1994 | * Return 0 on success else a negative value either an errno code or a | |
1995 | * LTTng-UST error code. | |
1996 | */ | |
d0b96690 DG |
1997 | int ust_app_version(struct ust_app *app) |
1998 | { | |
d88aee68 DG |
1999 | int ret; |
2000 | ||
d0b96690 | 2001 | assert(app); |
d88aee68 DG |
2002 | |
2003 | ret = ustctl_tracer_version(app->sock, &app->version); | |
2004 | if (ret < 0) { | |
2005 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
2006 | ERR("UST app %d verson failed with ret %d", app->sock, ret); | |
2007 | } else { | |
2008 | DBG3("UST app %d verion failed. Application is dead", app->sock); | |
2009 | } | |
2010 | } | |
2011 | ||
2012 | return ret; | |
5b4a0ec0 DG |
2013 | } |
2014 | ||
2015 | /* | |
2016 | * Unregister app by removing it from the global traceable app list and freeing | |
2017 | * the data struct. | |
2018 | * | |
2019 | * The socket is already closed at this point so no close to sock. | |
2020 | */ | |
2021 | void ust_app_unregister(int sock) | |
2022 | { | |
2023 | struct ust_app *lta; | |
bec39940 DG |
2024 | struct lttng_ht_node_ulong *node; |
2025 | struct lttng_ht_iter iter; | |
d42f20df | 2026 | struct ust_app_session *ua_sess; |
525b0740 | 2027 | int ret; |
5b4a0ec0 DG |
2028 | |
2029 | rcu_read_lock(); | |
886459c6 | 2030 | |
5b4a0ec0 | 2031 | /* Get the node reference for a call_rcu */ |
852d0037 | 2032 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 2033 | node = lttng_ht_iter_get_node_ulong(&iter); |
d0b96690 | 2034 | assert(node); |
284d8f55 | 2035 | |
852d0037 | 2036 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
2037 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
2038 | ||
886459c6 | 2039 | /* Remove application from PID hash table */ |
852d0037 DG |
2040 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
2041 | assert(!ret); | |
2042 | ||
d88aee68 DG |
2043 | /* |
2044 | * Remove application from notify hash table. The thread handling the | |
2045 | * notify socket could have deleted the node so ignore on error because | |
2046 | * either way it's valid. The close of that socket is handled by the other | |
2047 | * thread. | |
2048 | */ | |
d0b96690 | 2049 | iter.iter.node = <a->notify_sock_n.node; |
d88aee68 | 2050 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); |
852d0037 | 2051 | |
5b98a774 DG |
2052 | /* |
2053 | * Ignore return value since the node might have been removed before by an | |
2054 | * add replace during app registration because the PID can be reassigned by | |
2055 | * the OS. | |
2056 | */ | |
d0b96690 | 2057 | iter.iter.node = <a->pid_n.node; |
bec39940 | 2058 | ret = lttng_ht_del(ust_app_ht, &iter); |
5b98a774 DG |
2059 | if (ret) { |
2060 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
2061 | lta->pid); | |
2062 | } | |
852d0037 | 2063 | |
d42f20df DG |
2064 | /* Remove sessions so they are not visible during deletion.*/ |
2065 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, | |
2066 | node.node) { | |
2067 | ret = lttng_ht_del(lta->sessions, &iter); | |
2068 | if (ret) { | |
2069 | /* The session was already removed so scheduled for teardown. */ | |
2070 | continue; | |
2071 | } | |
2072 | ||
2073 | /* | |
2074 | * Add session to list for teardown. This is safe since at this point we | |
2075 | * are the only one using this list. | |
2076 | */ | |
d88aee68 DG |
2077 | pthread_mutex_lock(&ua_sess->lock); |
2078 | ||
2079 | /* | |
2080 | * Normally, this is done in the delete session process which is | |
2081 | * executed in the call rcu below. However, upon registration we can't | |
2082 | * afford to wait for the grace period before pushing data or else the | |
2083 | * data pending feature can race between the unregistration and stop | |
2084 | * command where the data pending command is sent *before* the grace | |
2085 | * period ended. | |
2086 | * | |
2087 | * The close metadata below nullifies the metadata pointer in the | |
2088 | * session so the delete session will NOT push/close a second time. | |
2089 | */ | |
2090 | (void) push_metadata(lta, ua_sess); | |
2091 | (void) close_metadata(lta, ua_sess); | |
2092 | ||
d42f20df | 2093 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
d88aee68 | 2094 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
2095 | } |
2096 | ||
852d0037 DG |
2097 | /* Free memory */ |
2098 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
2099 | ||
5b4a0ec0 DG |
2100 | rcu_read_unlock(); |
2101 | return; | |
284d8f55 DG |
2102 | } |
2103 | ||
2104 | /* | |
5b4a0ec0 | 2105 | * Return traceable_app_count |
284d8f55 | 2106 | */ |
5b4a0ec0 | 2107 | unsigned long ust_app_list_count(void) |
284d8f55 | 2108 | { |
5b4a0ec0 | 2109 | unsigned long count; |
284d8f55 | 2110 | |
5b4a0ec0 | 2111 | rcu_read_lock(); |
bec39940 | 2112 | count = lttng_ht_get_count(ust_app_ht); |
5b4a0ec0 | 2113 | rcu_read_unlock(); |
284d8f55 | 2114 | |
5b4a0ec0 | 2115 | return count; |
284d8f55 DG |
2116 | } |
2117 | ||
5b4a0ec0 DG |
2118 | /* |
2119 | * Fill events array with all events name of all registered apps. | |
2120 | */ | |
2121 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 2122 | { |
5b4a0ec0 DG |
2123 | int ret, handle; |
2124 | size_t nbmem, count = 0; | |
bec39940 | 2125 | struct lttng_ht_iter iter; |
5b4a0ec0 | 2126 | struct ust_app *app; |
c617c0c6 | 2127 | struct lttng_event *tmp_event; |
421cb601 | 2128 | |
5b4a0ec0 | 2129 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
2130 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
2131 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
2132 | PERROR("zmalloc ust app events"); |
2133 | ret = -ENOMEM; | |
421cb601 DG |
2134 | goto error; |
2135 | } | |
2136 | ||
5b4a0ec0 | 2137 | rcu_read_lock(); |
421cb601 | 2138 | |
852d0037 | 2139 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 2140 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 2141 | |
840cb59c | 2142 | health_code_update(); |
86acf0da | 2143 | |
e0c7ec2b DG |
2144 | if (!app->compatible) { |
2145 | /* | |
2146 | * TODO: In time, we should notice the caller of this error by | |
2147 | * telling him that this is a version error. | |
2148 | */ | |
2149 | continue; | |
2150 | } | |
852d0037 | 2151 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 2152 | if (handle < 0) { |
ffe60014 DG |
2153 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
2154 | ERR("UST app list events getting handle failed for app pid %d", | |
2155 | app->pid); | |
2156 | } | |
5b4a0ec0 DG |
2157 | continue; |
2158 | } | |
421cb601 | 2159 | |
852d0037 | 2160 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 2161 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
2162 | /* Handle ustctl error. */ |
2163 | if (ret < 0) { | |
2164 | free(tmp_event); | |
2165 | if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) { | |
2166 | ERR("UST app tp list get failed for app %d with ret %d", | |
2167 | app->sock, ret); | |
2168 | } else { | |
2169 | DBG3("UST app tp list get failed. Application is dead"); | |
2170 | } | |
2171 | goto rcu_error; | |
2172 | } | |
2173 | ||
840cb59c | 2174 | health_code_update(); |
815564d8 | 2175 | if (count >= nbmem) { |
d7b3776f | 2176 | /* In case the realloc fails, we free the memory */ |
c617c0c6 MD |
2177 | void *ptr; |
2178 | ||
815564d8 MD |
2179 | DBG2("Reallocating event list from %zu to %zu entries", nbmem, |
2180 | 2 * nbmem); | |
2181 | nbmem *= 2; | |
c617c0c6 MD |
2182 | ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event)); |
2183 | if (ptr == NULL) { | |
5b4a0ec0 | 2184 | PERROR("realloc ust app events"); |
c617c0c6 | 2185 | free(tmp_event); |
5b4a0ec0 DG |
2186 | ret = -ENOMEM; |
2187 | goto rcu_error; | |
2188 | } | |
c617c0c6 | 2189 | tmp_event = ptr; |
5b4a0ec0 | 2190 | } |
c617c0c6 MD |
2191 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
2192 | tmp_event[count].loglevel = uiter.loglevel; | |
2193 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
2194 | tmp_event[count].pid = app->pid; | |
2195 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 2196 | count++; |
421cb601 | 2197 | } |
421cb601 DG |
2198 | } |
2199 | ||
5b4a0ec0 | 2200 | ret = count; |
c617c0c6 | 2201 | *events = tmp_event; |
421cb601 | 2202 | |
5b4a0ec0 | 2203 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 2204 | |
5b4a0ec0 DG |
2205 | rcu_error: |
2206 | rcu_read_unlock(); | |
421cb601 | 2207 | error: |
840cb59c | 2208 | health_code_update(); |
5b4a0ec0 | 2209 | return ret; |
421cb601 DG |
2210 | } |
2211 | ||
f37d259d MD |
2212 | /* |
2213 | * Fill events array with all events name of all registered apps. | |
2214 | */ | |
2215 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
2216 | { | |
2217 | int ret, handle; | |
2218 | size_t nbmem, count = 0; | |
2219 | struct lttng_ht_iter iter; | |
2220 | struct ust_app *app; | |
c617c0c6 | 2221 | struct lttng_event_field *tmp_event; |
f37d259d MD |
2222 | |
2223 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
2224 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
2225 | if (tmp_event == NULL) { | |
f37d259d MD |
2226 | PERROR("zmalloc ust app event fields"); |
2227 | ret = -ENOMEM; | |
2228 | goto error; | |
2229 | } | |
2230 | ||
2231 | rcu_read_lock(); | |
2232 | ||
2233 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
2234 | struct lttng_ust_field_iter uiter; | |
2235 | ||
840cb59c | 2236 | health_code_update(); |
86acf0da | 2237 | |
f37d259d MD |
2238 | if (!app->compatible) { |
2239 | /* | |
2240 | * TODO: In time, we should notice the caller of this error by | |
2241 | * telling him that this is a version error. | |
2242 | */ | |
2243 | continue; | |
2244 | } | |
2245 | handle = ustctl_tracepoint_field_list(app->sock); | |
2246 | if (handle < 0) { | |
ffe60014 DG |
2247 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
2248 | ERR("UST app list field getting handle failed for app pid %d", | |
2249 | app->pid); | |
2250 | } | |
f37d259d MD |
2251 | continue; |
2252 | } | |
2253 | ||
2254 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 2255 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
2256 | /* Handle ustctl error. */ |
2257 | if (ret < 0) { | |
2258 | free(tmp_event); | |
2259 | if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) { | |
2260 | ERR("UST app tp list field failed for app %d with ret %d", | |
2261 | app->sock, ret); | |
2262 | } else { | |
2263 | DBG3("UST app tp list field failed. Application is dead"); | |
2264 | } | |
2265 | goto rcu_error; | |
2266 | } | |
2267 | ||
840cb59c | 2268 | health_code_update(); |
f37d259d | 2269 | if (count >= nbmem) { |
d7b3776f | 2270 | /* In case the realloc fails, we free the memory */ |
c617c0c6 MD |
2271 | void *ptr; |
2272 | ||
f37d259d MD |
2273 | DBG2("Reallocating event field list from %zu to %zu entries", nbmem, |
2274 | 2 * nbmem); | |
2275 | nbmem *= 2; | |
c617c0c6 MD |
2276 | ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event_field)); |
2277 | if (ptr == NULL) { | |
f37d259d | 2278 | PERROR("realloc ust app event fields"); |
c617c0c6 | 2279 | free(tmp_event); |
f37d259d MD |
2280 | ret = -ENOMEM; |
2281 | goto rcu_error; | |
2282 | } | |
c617c0c6 | 2283 | tmp_event = ptr; |
f37d259d | 2284 | } |
f37d259d | 2285 | |
c617c0c6 MD |
2286 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
2287 | tmp_event[count].type = uiter.type; | |
2288 | tmp_event[count].nowrite = uiter.nowrite; | |
f37d259d | 2289 | |
c617c0c6 MD |
2290 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
2291 | tmp_event[count].event.loglevel = uiter.loglevel; | |
2292 | tmp_event[count].event.type = LTTNG_UST_TRACEPOINT; | |
2293 | tmp_event[count].event.pid = app->pid; | |
2294 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
2295 | count++; |
2296 | } | |
2297 | } | |
2298 | ||
2299 | ret = count; | |
c617c0c6 | 2300 | *fields = tmp_event; |
f37d259d MD |
2301 | |
2302 | DBG2("UST app list event fields done (%zu events)", count); | |
2303 | ||
2304 | rcu_error: | |
2305 | rcu_read_unlock(); | |
2306 | error: | |
840cb59c | 2307 | health_code_update(); |
f37d259d MD |
2308 | return ret; |
2309 | } | |
2310 | ||
5b4a0ec0 DG |
2311 | /* |
2312 | * Free and clean all traceable apps of the global list. | |
2313 | */ | |
2314 | void ust_app_clean_list(void) | |
421cb601 | 2315 | { |
5b4a0ec0 | 2316 | int ret; |
659ed79f | 2317 | struct ust_app *app; |
bec39940 | 2318 | struct lttng_ht_iter iter; |
421cb601 | 2319 | |
5b4a0ec0 | 2320 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 2321 | |
5b4a0ec0 | 2322 | rcu_read_lock(); |
421cb601 | 2323 | |
659ed79f | 2324 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 2325 | ret = lttng_ht_del(ust_app_ht, &iter); |
525b0740 | 2326 | assert(!ret); |
659ed79f | 2327 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); |
421cb601 DG |
2328 | } |
2329 | ||
852d0037 | 2330 | /* Cleanup socket hash table */ |
659ed79f DG |
2331 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, |
2332 | sock_n.node) { | |
852d0037 | 2333 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
bec39940 DG |
2334 | assert(!ret); |
2335 | } | |
852d0037 | 2336 | |
d88aee68 DG |
2337 | /* Cleanup notify socket hash table */ |
2338 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
2339 | notify_sock_n.node) { | |
2340 | ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
2341 | assert(!ret); | |
2342 | } | |
2343 | ||
bec39940 | 2344 | /* Destroy is done only when the ht is empty */ |
852d0037 DG |
2345 | lttng_ht_destroy(ust_app_ht); |
2346 | lttng_ht_destroy(ust_app_ht_by_sock); | |
d88aee68 | 2347 | lttng_ht_destroy(ust_app_ht_by_notify_sock); |
421cb601 | 2348 | |
5b4a0ec0 DG |
2349 | rcu_read_unlock(); |
2350 | } | |
2351 | ||
2352 | /* | |
2353 | * Init UST app hash table. | |
2354 | */ | |
2355 | void ust_app_ht_alloc(void) | |
2356 | { | |
bec39940 | 2357 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
852d0037 | 2358 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 2359 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
421cb601 DG |
2360 | } |
2361 | ||
78f0bacd DG |
2362 | /* |
2363 | * For a specific UST session, disable the channel for all registered apps. | |
2364 | */ | |
35a9059d | 2365 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
2366 | struct ltt_ust_channel *uchan) |
2367 | { | |
2368 | int ret = 0; | |
bec39940 DG |
2369 | struct lttng_ht_iter iter; |
2370 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
2371 | struct ust_app *app; |
2372 | struct ust_app_session *ua_sess; | |
8535a6d9 | 2373 | struct ust_app_channel *ua_chan; |
78f0bacd DG |
2374 | |
2375 | if (usess == NULL || uchan == NULL) { | |
2376 | ERR("Disabling UST global channel with NULL values"); | |
2377 | ret = -1; | |
2378 | goto error; | |
2379 | } | |
2380 | ||
a991f516 MD |
2381 | DBG2("UST app disabling channel %s from global domain for session id %d", |
2382 | uchan->name, usess->id); | |
78f0bacd DG |
2383 | |
2384 | rcu_read_lock(); | |
2385 | ||
2386 | /* For every registered applications */ | |
852d0037 | 2387 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 2388 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
2389 | if (!app->compatible) { |
2390 | /* | |
2391 | * TODO: In time, we should notice the caller of this error by | |
2392 | * telling him that this is a version error. | |
2393 | */ | |
2394 | continue; | |
2395 | } | |
78f0bacd DG |
2396 | ua_sess = lookup_session_by_app(usess, app); |
2397 | if (ua_sess == NULL) { | |
2398 | continue; | |
2399 | } | |
2400 | ||
8535a6d9 | 2401 | /* Get channel */ |
bec39940 DG |
2402 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
2403 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
2404 | /* If the session if found for the app, the channel must be there */ |
2405 | assert(ua_chan_node); | |
2406 | ||
2407 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2408 | /* The channel must not be already disabled */ | |
2409 | assert(ua_chan->enabled == 1); | |
2410 | ||
2411 | /* Disable channel onto application */ | |
2412 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
2413 | if (ret < 0) { |
2414 | /* XXX: We might want to report this error at some point... */ | |
2415 | continue; | |
2416 | } | |
2417 | } | |
2418 | ||
2419 | rcu_read_unlock(); | |
2420 | ||
2421 | error: | |
2422 | return ret; | |
2423 | } | |
2424 | ||
2425 | /* | |
2426 | * For a specific UST session, enable the channel for all registered apps. | |
2427 | */ | |
35a9059d | 2428 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
2429 | struct ltt_ust_channel *uchan) |
2430 | { | |
2431 | int ret = 0; | |
bec39940 | 2432 | struct lttng_ht_iter iter; |
78f0bacd DG |
2433 | struct ust_app *app; |
2434 | struct ust_app_session *ua_sess; | |
2435 | ||
2436 | if (usess == NULL || uchan == NULL) { | |
2437 | ERR("Adding UST global channel to NULL values"); | |
2438 | ret = -1; | |
2439 | goto error; | |
2440 | } | |
2441 | ||
a991f516 MD |
2442 | DBG2("UST app enabling channel %s to global domain for session id %d", |
2443 | uchan->name, usess->id); | |
78f0bacd DG |
2444 | |
2445 | rcu_read_lock(); | |
2446 | ||
2447 | /* For every registered applications */ | |
852d0037 | 2448 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
2449 | if (!app->compatible) { |
2450 | /* | |
2451 | * TODO: In time, we should notice the caller of this error by | |
2452 | * telling him that this is a version error. | |
2453 | */ | |
2454 | continue; | |
2455 | } | |
78f0bacd DG |
2456 | ua_sess = lookup_session_by_app(usess, app); |
2457 | if (ua_sess == NULL) { | |
2458 | continue; | |
2459 | } | |
2460 | ||
2461 | /* Enable channel onto application */ | |
2462 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
2463 | if (ret < 0) { | |
2464 | /* XXX: We might want to report this error at some point... */ | |
2465 | continue; | |
2466 | } | |
2467 | } | |
2468 | ||
2469 | rcu_read_unlock(); | |
2470 | ||
2471 | error: | |
2472 | return ret; | |
2473 | } | |
2474 | ||
b0a40d28 DG |
2475 | /* |
2476 | * Disable an event in a channel and for a specific session. | |
2477 | */ | |
35a9059d DG |
2478 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
2479 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
2480 | { |
2481 | int ret = 0; | |
bec39940 DG |
2482 | struct lttng_ht_iter iter, uiter; |
2483 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
b0a40d28 DG |
2484 | struct ust_app *app; |
2485 | struct ust_app_session *ua_sess; | |
2486 | struct ust_app_channel *ua_chan; | |
2487 | struct ust_app_event *ua_event; | |
2488 | ||
2489 | DBG("UST app disabling event %s for all apps in channel " | |
a991f516 | 2490 | "%s for session id %d", uevent->attr.name, uchan->name, usess->id); |
b0a40d28 DG |
2491 | |
2492 | rcu_read_lock(); | |
2493 | ||
2494 | /* For all registered applications */ | |
852d0037 | 2495 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
2496 | if (!app->compatible) { |
2497 | /* | |
2498 | * TODO: In time, we should notice the caller of this error by | |
2499 | * telling him that this is a version error. | |
2500 | */ | |
2501 | continue; | |
2502 | } | |
b0a40d28 DG |
2503 | ua_sess = lookup_session_by_app(usess, app); |
2504 | if (ua_sess == NULL) { | |
2505 | /* Next app */ | |
2506 | continue; | |
2507 | } | |
2508 | ||
2509 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
2510 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
2511 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 2512 | if (ua_chan_node == NULL) { |
a991f516 | 2513 | DBG2("Channel %s not found in session id %d for app pid %d." |
852d0037 | 2514 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
2515 | continue; |
2516 | } | |
2517 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2518 | ||
bec39940 DG |
2519 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter); |
2520 | ua_event_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 DG |
2521 | if (ua_event_node == NULL) { |
2522 | DBG2("Event %s not found in channel %s for app pid %d." | |
852d0037 | 2523 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
2524 | continue; |
2525 | } | |
2526 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
2527 | ||
7f79d3a1 | 2528 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
2529 | if (ret < 0) { |
2530 | /* XXX: Report error someday... */ | |
2531 | continue; | |
2532 | } | |
2533 | } | |
2534 | ||
2535 | rcu_read_unlock(); | |
2536 | ||
2537 | return ret; | |
2538 | } | |
2539 | ||
9730260e | 2540 | /* |
edb67388 | 2541 | * For a specific UST session and UST channel, the event for all |
9730260e DG |
2542 | * registered apps. |
2543 | */ | |
35a9059d | 2544 | int ust_app_disable_all_event_glb(struct ltt_ust_session *usess, |
9730260e DG |
2545 | struct ltt_ust_channel *uchan) |
2546 | { | |
2547 | int ret = 0; | |
bec39940 DG |
2548 | struct lttng_ht_iter iter, uiter; |
2549 | struct lttng_ht_node_str *ua_chan_node; | |
9730260e DG |
2550 | struct ust_app *app; |
2551 | struct ust_app_session *ua_sess; | |
2552 | struct ust_app_channel *ua_chan; | |
2553 | struct ust_app_event *ua_event; | |
2554 | ||
2555 | DBG("UST app disabling all event for all apps in channel " | |
a991f516 | 2556 | "%s for session id %d", uchan->name, usess->id); |
9730260e DG |
2557 | |
2558 | rcu_read_lock(); | |
2559 | ||
2560 | /* For all registered applications */ | |
852d0037 | 2561 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
2562 | if (!app->compatible) { |
2563 | /* | |
2564 | * TODO: In time, we should notice the caller of this error by | |
2565 | * telling him that this is a version error. | |
2566 | */ | |
2567 | continue; | |
2568 | } | |
9730260e | 2569 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
2570 | if (!ua_sess) { |
2571 | /* The application has problem or is probably dead. */ | |
2572 | continue; | |
2573 | } | |
9730260e DG |
2574 | |
2575 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
2576 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
2577 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
2578 | /* If the channel is not found, there is a code flow error */ |
2579 | assert(ua_chan_node); | |
2580 | ||
9730260e DG |
2581 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
2582 | ||
2583 | /* Disable each events of channel */ | |
bec39940 DG |
2584 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
2585 | node.node) { | |
7f79d3a1 | 2586 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
9730260e DG |
2587 | if (ret < 0) { |
2588 | /* XXX: Report error someday... */ | |
2589 | continue; | |
2590 | } | |
2591 | } | |
2592 | } | |
2593 | ||
2594 | rcu_read_unlock(); | |
2595 | ||
2596 | return ret; | |
2597 | } | |
2598 | ||
421cb601 | 2599 | /* |
5b4a0ec0 | 2600 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 2601 | */ |
35a9059d | 2602 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
2603 | struct ltt_ust_channel *uchan) |
2604 | { | |
3d8ca23b | 2605 | int ret = 0, created; |
bec39940 | 2606 | struct lttng_ht_iter iter; |
48842b30 | 2607 | struct ust_app *app; |
3d8ca23b | 2608 | struct ust_app_session *ua_sess = NULL; |
48842b30 | 2609 | |
fc34caaa DG |
2610 | /* Very wrong code flow */ |
2611 | assert(usess); | |
2612 | assert(uchan); | |
421cb601 | 2613 | |
a991f516 MD |
2614 | DBG2("UST app adding channel %s to global domain for session id %d", |
2615 | uchan->name, usess->id); | |
48842b30 DG |
2616 | |
2617 | rcu_read_lock(); | |
421cb601 | 2618 | |
5b4a0ec0 | 2619 | /* For every registered applications */ |
852d0037 | 2620 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
2621 | if (!app->compatible) { |
2622 | /* | |
2623 | * TODO: In time, we should notice the caller of this error by | |
2624 | * telling him that this is a version error. | |
2625 | */ | |
2626 | continue; | |
2627 | } | |
edb67388 DG |
2628 | /* |
2629 | * Create session on the tracer side and add it to app session HT. Note | |
2630 | * that if session exist, it will simply return a pointer to the ust | |
2631 | * app session. | |
2632 | */ | |
3d8ca23b DG |
2633 | ret = create_ust_app_session(usess, app, &ua_sess, &created); |
2634 | if (ret < 0) { | |
2635 | switch (ret) { | |
2636 | case -ENOTCONN: | |
2637 | /* | |
2638 | * The application's socket is not valid. Either a bad socket | |
2639 | * or a timeout on it. We can't inform the caller that for a | |
2640 | * specific app, the session failed so lets continue here. | |
2641 | */ | |
2642 | continue; | |
2643 | case -ENOMEM: | |
2644 | default: | |
2645 | goto error_rcu_unlock; | |
2646 | } | |
48842b30 | 2647 | } |
3d8ca23b | 2648 | assert(ua_sess); |
48842b30 | 2649 | |
d0b96690 | 2650 | pthread_mutex_lock(&ua_sess->lock); |
4d710ac2 | 2651 | /* Create channel onto application. We don't need the chan ref. */ |
ffe60014 DG |
2652 | ret = create_ust_app_channel(ua_sess, uchan, app, usess->consumer, |
2653 | LTTNG_UST_CHAN_PER_CPU, NULL); | |
d0b96690 | 2654 | pthread_mutex_unlock(&ua_sess->lock); |
3d8ca23b DG |
2655 | if (ret < 0) { |
2656 | if (ret == -ENOMEM) { | |
2657 | /* No more memory is a fatal error. Stop right now. */ | |
2658 | goto error_rcu_unlock; | |
2659 | } | |
2660 | /* Cleanup the created session if it's the case. */ | |
2661 | if (created) { | |
d0b96690 | 2662 | destroy_app_session(app, ua_sess); |
3d8ca23b | 2663 | } |
48842b30 | 2664 | } |
48842b30 | 2665 | } |
5b4a0ec0 | 2666 | |
95e047ff | 2667 | error_rcu_unlock: |
48842b30 | 2668 | rcu_read_unlock(); |
3c14c33f | 2669 | return ret; |
48842b30 DG |
2670 | } |
2671 | ||
5b4a0ec0 | 2672 | /* |
edb67388 | 2673 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 2674 | */ |
35a9059d | 2675 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
2676 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
2677 | { | |
2678 | int ret = 0; | |
bec39940 | 2679 | struct lttng_ht_iter iter, uiter; |
18eace3b | 2680 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
2681 | struct ust_app *app; |
2682 | struct ust_app_session *ua_sess; | |
2683 | struct ust_app_channel *ua_chan; | |
2684 | struct ust_app_event *ua_event; | |
48842b30 | 2685 | |
a991f516 MD |
2686 | DBG("UST app enabling event %s for all apps for session id %d", |
2687 | uevent->attr.name, usess->id); | |
48842b30 | 2688 | |
edb67388 DG |
2689 | /* |
2690 | * NOTE: At this point, this function is called only if the session and | |
2691 | * channel passed are already created for all apps. and enabled on the | |
2692 | * tracer also. | |
2693 | */ | |
2694 | ||
48842b30 | 2695 | rcu_read_lock(); |
421cb601 DG |
2696 | |
2697 | /* For all registered applications */ | |
852d0037 | 2698 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
2699 | if (!app->compatible) { |
2700 | /* | |
2701 | * TODO: In time, we should notice the caller of this error by | |
2702 | * telling him that this is a version error. | |
2703 | */ | |
2704 | continue; | |
2705 | } | |
edb67388 | 2706 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
2707 | if (!ua_sess) { |
2708 | /* The application has problem or is probably dead. */ | |
2709 | continue; | |
2710 | } | |
ba767faf | 2711 | |
d0b96690 DG |
2712 | pthread_mutex_lock(&ua_sess->lock); |
2713 | ||
edb67388 | 2714 | /* Lookup channel in the ust app session */ |
bec39940 DG |
2715 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
2716 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
2717 | /* If the channel is not found, there is a code flow error */ |
2718 | assert(ua_chan_node); | |
2719 | ||
2720 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2721 | ||
18eace3b DG |
2722 | /* Get event node */ |
2723 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
2724 | uevent->filter, uevent->attr.loglevel); | |
2725 | if (ua_event == NULL) { | |
7f79d3a1 | 2726 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 2727 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 2728 | goto next_app; |
35a9059d | 2729 | } |
35a9059d DG |
2730 | |
2731 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
2732 | if (ret < 0) { | |
d0b96690 | 2733 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 2734 | goto error; |
48842b30 | 2735 | } |
d0b96690 DG |
2736 | next_app: |
2737 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
2738 | } |
2739 | ||
7f79d3a1 | 2740 | error: |
edb67388 | 2741 | rcu_read_unlock(); |
edb67388 DG |
2742 | return ret; |
2743 | } | |
2744 | ||
2745 | /* | |
2746 | * For a specific existing UST session and UST channel, creates the event for | |
2747 | * all registered apps. | |
2748 | */ | |
35a9059d | 2749 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
2750 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
2751 | { | |
2752 | int ret = 0; | |
bec39940 DG |
2753 | struct lttng_ht_iter iter, uiter; |
2754 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
2755 | struct ust_app *app; |
2756 | struct ust_app_session *ua_sess; | |
2757 | struct ust_app_channel *ua_chan; | |
2758 | ||
a991f516 MD |
2759 | DBG("UST app creating event %s for all apps for session id %d", |
2760 | uevent->attr.name, usess->id); | |
edb67388 | 2761 | |
edb67388 DG |
2762 | rcu_read_lock(); |
2763 | ||
2764 | /* For all registered applications */ | |
852d0037 | 2765 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
2766 | if (!app->compatible) { |
2767 | /* | |
2768 | * TODO: In time, we should notice the caller of this error by | |
2769 | * telling him that this is a version error. | |
2770 | */ | |
2771 | continue; | |
2772 | } | |
edb67388 | 2773 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
2774 | if (!ua_sess) { |
2775 | /* The application has problem or is probably dead. */ | |
2776 | continue; | |
2777 | } | |
48842b30 | 2778 | |
d0b96690 | 2779 | pthread_mutex_lock(&ua_sess->lock); |
48842b30 | 2780 | /* Lookup channel in the ust app session */ |
bec39940 DG |
2781 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
2782 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
2783 | /* If the channel is not found, there is a code flow error */ |
2784 | assert(ua_chan_node); | |
2785 | ||
48842b30 DG |
2786 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
2787 | ||
edb67388 | 2788 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 2789 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 2790 | if (ret < 0) { |
49c336c1 | 2791 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
2792 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
2793 | break; | |
2794 | } | |
2795 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 2796 | uevent->attr.name, app->pid); |
5b4a0ec0 | 2797 | continue; |
48842b30 | 2798 | } |
48842b30 | 2799 | } |
5b4a0ec0 | 2800 | |
48842b30 DG |
2801 | rcu_read_unlock(); |
2802 | ||
2803 | return ret; | |
2804 | } | |
2805 | ||
5b4a0ec0 DG |
2806 | /* |
2807 | * Start tracing for a specific UST session and app. | |
2808 | */ | |
421cb601 | 2809 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
2810 | { |
2811 | int ret = 0; | |
48842b30 | 2812 | struct ust_app_session *ua_sess; |
48842b30 | 2813 | |
852d0037 | 2814 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 2815 | |
509cbaf8 MD |
2816 | rcu_read_lock(); |
2817 | ||
e0c7ec2b DG |
2818 | if (!app->compatible) { |
2819 | goto end; | |
2820 | } | |
2821 | ||
421cb601 DG |
2822 | ua_sess = lookup_session_by_app(usess, app); |
2823 | if (ua_sess == NULL) { | |
d42f20df DG |
2824 | /* The session is in teardown process. Ignore and continue. */ |
2825 | goto end; | |
421cb601 | 2826 | } |
48842b30 | 2827 | |
d0b96690 DG |
2828 | pthread_mutex_lock(&ua_sess->lock); |
2829 | ||
aea829b3 DG |
2830 | /* Upon restart, we skip the setup, already done */ |
2831 | if (ua_sess->started) { | |
8be98f9a | 2832 | goto skip_setup; |
aea829b3 | 2833 | } |
8be98f9a | 2834 | |
a4b92340 DG |
2835 | /* Create directories if consumer is LOCAL and has a path defined. */ |
2836 | if (usess->consumer->type == CONSUMER_DST_LOCAL && | |
2837 | strlen(usess->consumer->dst.trace_path) > 0) { | |
2838 | ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path, | |
2839 | S_IRWXU | S_IRWXG, usess->uid, usess->gid); | |
2840 | if (ret < 0) { | |
2841 | if (ret != -EEXIST) { | |
2842 | ERR("Trace directory creation error"); | |
d0b96690 | 2843 | goto error_unlock; |
421cb601 | 2844 | } |
173af62f | 2845 | } |
7753dea8 | 2846 | } |
aea829b3 | 2847 | |
ffe60014 DG |
2848 | /* Create the metadata for the application. */ |
2849 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer); | |
421cb601 | 2850 | if (ret < 0) { |
d0b96690 | 2851 | goto error_unlock; |
421cb601 | 2852 | } |
48842b30 | 2853 | |
840cb59c | 2854 | health_code_update(); |
86acf0da | 2855 | |
8be98f9a | 2856 | skip_setup: |
421cb601 | 2857 | /* This start the UST tracing */ |
852d0037 | 2858 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
421cb601 | 2859 | if (ret < 0) { |
ffe60014 DG |
2860 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
2861 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
2862 | app->pid, ret); | |
2863 | } else { | |
2864 | DBG("UST app start session failed. Application is dead."); | |
2865 | } | |
d0b96690 | 2866 | goto error_unlock; |
421cb601 | 2867 | } |
5b4a0ec0 | 2868 | |
55c3953d DG |
2869 | /* Indicate that the session has been started once */ |
2870 | ua_sess->started = 1; | |
2871 | ||
d0b96690 DG |
2872 | pthread_mutex_unlock(&ua_sess->lock); |
2873 | ||
840cb59c | 2874 | health_code_update(); |
86acf0da | 2875 | |
421cb601 | 2876 | /* Quiescent wait after starting trace */ |
ffe60014 DG |
2877 | ret = ustctl_wait_quiescent(app->sock); |
2878 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
2879 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
2880 | app->pid, ret); | |
2881 | } | |
48842b30 | 2882 | |
e0c7ec2b DG |
2883 | end: |
2884 | rcu_read_unlock(); | |
840cb59c | 2885 | health_code_update(); |
421cb601 | 2886 | return 0; |
48842b30 | 2887 | |
d0b96690 DG |
2888 | error_unlock: |
2889 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 2890 | rcu_read_unlock(); |
840cb59c | 2891 | health_code_update(); |
421cb601 DG |
2892 | return -1; |
2893 | } | |
48842b30 | 2894 | |
8be98f9a MD |
2895 | /* |
2896 | * Stop tracing for a specific UST session and app. | |
2897 | */ | |
2898 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) | |
2899 | { | |
2900 | int ret = 0; | |
bec39940 | 2901 | struct lttng_ht_iter iter; |
8be98f9a | 2902 | struct ust_app_session *ua_sess; |
6d3686da | 2903 | struct ust_app_channel *ua_chan; |
8be98f9a | 2904 | |
852d0037 | 2905 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
2906 | |
2907 | rcu_read_lock(); | |
2908 | ||
e0c7ec2b | 2909 | if (!app->compatible) { |
d88aee68 | 2910 | goto end_no_session; |
e0c7ec2b DG |
2911 | } |
2912 | ||
8be98f9a MD |
2913 | ua_sess = lookup_session_by_app(usess, app); |
2914 | if (ua_sess == NULL) { | |
d88aee68 | 2915 | goto end_no_session; |
8be98f9a MD |
2916 | } |
2917 | ||
d88aee68 DG |
2918 | pthread_mutex_lock(&ua_sess->lock); |
2919 | ||
9bc07046 DG |
2920 | /* |
2921 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
2922 | * that was never started. It's possible since we can have a fail start |
2923 | * from either the application manager thread or the command thread. Simply | |
2924 | * indicate that this is a stop error. | |
9bc07046 | 2925 | */ |
f9dfc3d9 | 2926 | if (!ua_sess->started) { |
c45536e1 DG |
2927 | goto error_rcu_unlock; |
2928 | } | |
7db205b5 | 2929 | |
840cb59c | 2930 | health_code_update(); |
86acf0da | 2931 | |
9d6c7d3f | 2932 | /* This inhibits UST tracing */ |
852d0037 | 2933 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
9d6c7d3f | 2934 | if (ret < 0) { |
ffe60014 DG |
2935 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
2936 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
2937 | app->pid, ret); | |
2938 | } else { | |
2939 | DBG("UST app stop session failed. Application is dead."); | |
2940 | } | |
9d6c7d3f DG |
2941 | goto error_rcu_unlock; |
2942 | } | |
2943 | ||
840cb59c | 2944 | health_code_update(); |
86acf0da | 2945 | |
9d6c7d3f | 2946 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
2947 | ret = ustctl_wait_quiescent(app->sock); |
2948 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
2949 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
2950 | app->pid, ret); | |
2951 | } | |
9d6c7d3f | 2952 | |
840cb59c | 2953 | health_code_update(); |
86acf0da | 2954 | |
9d6c7d3f | 2955 | /* Flushing buffers */ |
bec39940 DG |
2956 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
2957 | node.node) { | |
840cb59c | 2958 | health_code_update(); |
ffe60014 | 2959 | assert(ua_chan->is_sent); |
852d0037 | 2960 | ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj); |
8be98f9a | 2961 | if (ret < 0) { |
ffe60014 DG |
2962 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
2963 | ERR("UST app PID %d channel %s flush failed with ret %d", | |
2964 | app->pid, ua_chan->name, ret); | |
2965 | } else { | |
2966 | DBG3("UST app failed to flush %s. Application is dead.", | |
2967 | ua_chan->name); | |
2968 | /* No need to continue. */ | |
d88aee68 | 2969 | break; |
ffe60014 | 2970 | } |
6d3686da DG |
2971 | /* Continuing flushing all buffers */ |
2972 | continue; | |
8be98f9a MD |
2973 | } |
2974 | } | |
8be98f9a | 2975 | |
840cb59c | 2976 | health_code_update(); |
86acf0da | 2977 | |
d88aee68 | 2978 | ret = push_metadata(app, ua_sess); |
90d97d10 | 2979 | if (ret < 0) { |
d88aee68 | 2980 | goto error_rcu_unlock; |
90d97d10 DG |
2981 | } |
2982 | ||
d88aee68 DG |
2983 | pthread_mutex_unlock(&ua_sess->lock); |
2984 | end_no_session: | |
7db205b5 | 2985 | rcu_read_unlock(); |
840cb59c | 2986 | health_code_update(); |
8be98f9a MD |
2987 | return 0; |
2988 | ||
2989 | error_rcu_unlock: | |
d88aee68 | 2990 | pthread_mutex_unlock(&ua_sess->lock); |
8be98f9a | 2991 | rcu_read_unlock(); |
840cb59c | 2992 | health_code_update(); |
8be98f9a MD |
2993 | return -1; |
2994 | } | |
2995 | ||
84cd17c6 MD |
2996 | /* |
2997 | * Destroy a specific UST session in apps. | |
2998 | */ | |
3353de95 | 2999 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 3000 | { |
ffe60014 | 3001 | int ret; |
84cd17c6 | 3002 | struct ust_app_session *ua_sess; |
bec39940 DG |
3003 | struct lttng_ht_iter iter; |
3004 | struct lttng_ht_node_ulong *node; | |
84cd17c6 | 3005 | |
852d0037 | 3006 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
3007 | |
3008 | rcu_read_lock(); | |
3009 | ||
e0c7ec2b DG |
3010 | if (!app->compatible) { |
3011 | goto end; | |
3012 | } | |
3013 | ||
84cd17c6 | 3014 | __lookup_session_by_app(usess, app, &iter); |
bec39940 | 3015 | node = lttng_ht_iter_get_node_ulong(&iter); |
84cd17c6 | 3016 | if (node == NULL) { |
d42f20df DG |
3017 | /* Session is being or is deleted. */ |
3018 | goto end; | |
84cd17c6 MD |
3019 | } |
3020 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 3021 | |
840cb59c | 3022 | health_code_update(); |
d0b96690 | 3023 | destroy_app_session(app, ua_sess); |
84cd17c6 | 3024 | |
840cb59c | 3025 | health_code_update(); |
7db205b5 | 3026 | |
84cd17c6 | 3027 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
3028 | ret = ustctl_wait_quiescent(app->sock); |
3029 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3030 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3031 | app->pid, ret); | |
3032 | } | |
e0c7ec2b DG |
3033 | end: |
3034 | rcu_read_unlock(); | |
840cb59c | 3035 | health_code_update(); |
84cd17c6 | 3036 | return 0; |
84cd17c6 MD |
3037 | } |
3038 | ||
5b4a0ec0 DG |
3039 | /* |
3040 | * Start tracing for the UST session. | |
3041 | */ | |
421cb601 DG |
3042 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
3043 | { | |
3044 | int ret = 0; | |
bec39940 | 3045 | struct lttng_ht_iter iter; |
421cb601 | 3046 | struct ust_app *app; |
48842b30 | 3047 | |
421cb601 DG |
3048 | DBG("Starting all UST traces"); |
3049 | ||
3050 | rcu_read_lock(); | |
421cb601 | 3051 | |
852d0037 | 3052 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
421cb601 | 3053 | ret = ust_app_start_trace(usess, app); |
48842b30 | 3054 | if (ret < 0) { |
5b4a0ec0 DG |
3055 | /* Continue to next apps even on error */ |
3056 | continue; | |
48842b30 | 3057 | } |
48842b30 | 3058 | } |
5b4a0ec0 | 3059 | |
48842b30 DG |
3060 | rcu_read_unlock(); |
3061 | ||
3062 | return 0; | |
3063 | } | |
487cf67c | 3064 | |
8be98f9a MD |
3065 | /* |
3066 | * Start tracing for the UST session. | |
3067 | */ | |
3068 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
3069 | { | |
3070 | int ret = 0; | |
bec39940 | 3071 | struct lttng_ht_iter iter; |
8be98f9a MD |
3072 | struct ust_app *app; |
3073 | ||
3074 | DBG("Stopping all UST traces"); | |
3075 | ||
3076 | rcu_read_lock(); | |
3077 | ||
852d0037 | 3078 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
8be98f9a MD |
3079 | ret = ust_app_stop_trace(usess, app); |
3080 | if (ret < 0) { | |
d88aee68 | 3081 | ERR("UST app stop trace failed with ret %d", ret); |
8be98f9a MD |
3082 | /* Continue to next apps even on error */ |
3083 | continue; | |
3084 | } | |
3085 | } | |
3086 | ||
3087 | rcu_read_unlock(); | |
3088 | ||
3089 | return 0; | |
3090 | } | |
3091 | ||
84cd17c6 MD |
3092 | /* |
3093 | * Destroy app UST session. | |
3094 | */ | |
3095 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
3096 | { | |
3097 | int ret = 0; | |
bec39940 | 3098 | struct lttng_ht_iter iter; |
84cd17c6 MD |
3099 | struct ust_app *app; |
3100 | ||
3101 | DBG("Destroy all UST traces"); | |
3102 | ||
3103 | rcu_read_lock(); | |
3104 | ||
852d0037 | 3105 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 3106 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
3107 | if (ret < 0) { |
3108 | /* Continue to next apps even on error */ | |
3109 | continue; | |
3110 | } | |
3111 | } | |
3112 | ||
3113 | rcu_read_unlock(); | |
3114 | ||
3115 | return 0; | |
3116 | } | |
3117 | ||
5b4a0ec0 DG |
3118 | /* |
3119 | * Add channels/events from UST global domain to registered apps at sock. | |
3120 | */ | |
487cf67c DG |
3121 | void ust_app_global_update(struct ltt_ust_session *usess, int sock) |
3122 | { | |
55c54cce | 3123 | int ret = 0; |
727d5404 | 3124 | struct lttng_ht_iter iter, uiter, iter_ctx; |
487cf67c | 3125 | struct ust_app *app; |
3d8ca23b | 3126 | struct ust_app_session *ua_sess = NULL; |
487cf67c DG |
3127 | struct ust_app_channel *ua_chan; |
3128 | struct ust_app_event *ua_event; | |
727d5404 | 3129 | struct ust_app_ctx *ua_ctx; |
1f3580c7 | 3130 | |
95e047ff | 3131 | assert(usess); |
ffe60014 | 3132 | assert(sock >= 0); |
1f3580c7 | 3133 | |
a991f516 MD |
3134 | DBG2("UST app global update for app sock %d for session id %d", sock, |
3135 | usess->id); | |
487cf67c | 3136 | |
284d8f55 DG |
3137 | rcu_read_lock(); |
3138 | ||
487cf67c DG |
3139 | app = find_app_by_sock(sock); |
3140 | if (app == NULL) { | |
d88aee68 DG |
3141 | /* |
3142 | * Application can be unregistered before so this is possible hence | |
3143 | * simply stopping the update. | |
3144 | */ | |
3145 | DBG3("UST app update failed to find app sock %d", sock); | |
487cf67c DG |
3146 | goto error; |
3147 | } | |
3148 | ||
e0c7ec2b DG |
3149 | if (!app->compatible) { |
3150 | goto error; | |
3151 | } | |
3152 | ||
3d8ca23b DG |
3153 | ret = create_ust_app_session(usess, app, &ua_sess, NULL); |
3154 | if (ret < 0) { | |
3155 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
3156 | goto error; |
3157 | } | |
3d8ca23b | 3158 | assert(ua_sess); |
487cf67c | 3159 | |
d0b96690 DG |
3160 | pthread_mutex_lock(&ua_sess->lock); |
3161 | ||
284d8f55 | 3162 | /* |
d0b96690 | 3163 | * We can iterate safely here over all UST app session since the create ust |
284d8f55 DG |
3164 | * app session above made a shadow copy of the UST global domain from the |
3165 | * ltt ust session. | |
3166 | */ | |
bec39940 DG |
3167 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
3168 | node.node) { | |
ffe60014 | 3169 | ret = create_ust_channel(app, ua_sess, ua_chan, usess->consumer); |
284d8f55 | 3170 | if (ret < 0) { |
ffe60014 DG |
3171 | /* |
3172 | * Stop everything. On error, the application failed, no more file | |
3173 | * descriptor are available or ENOMEM so stopping here is the only | |
3174 | * thing we can do for now. | |
3175 | */ | |
d0b96690 | 3176 | goto error_unlock; |
487cf67c DG |
3177 | } |
3178 | ||
727d5404 DG |
3179 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter_ctx.iter, ua_ctx, |
3180 | node.node) { | |
3181 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
3182 | if (ret < 0) { | |
d0b96690 | 3183 | goto error_unlock; |
727d5404 DG |
3184 | } |
3185 | } | |
3186 | ||
3187 | ||
284d8f55 | 3188 | /* For each events */ |
bec39940 DG |
3189 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
3190 | node.node) { | |
284d8f55 DG |
3191 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
3192 | if (ret < 0) { | |
d0b96690 | 3193 | goto error_unlock; |
487cf67c | 3194 | } |
36dc12cc | 3195 | } |
487cf67c DG |
3196 | } |
3197 | ||
d0b96690 DG |
3198 | pthread_mutex_unlock(&ua_sess->lock); |
3199 | ||
36dc12cc | 3200 | if (usess->start_trace) { |
421cb601 | 3201 | ret = ust_app_start_trace(usess, app); |
36dc12cc | 3202 | if (ret < 0) { |
36dc12cc DG |
3203 | goto error; |
3204 | } | |
3205 | ||
852d0037 | 3206 | DBG2("UST trace started for app pid %d", app->pid); |
36dc12cc DG |
3207 | } |
3208 | ||
ffe60014 DG |
3209 | /* Everything went well at this point. */ |
3210 | rcu_read_unlock(); | |
3211 | return; | |
3212 | ||
d0b96690 DG |
3213 | error_unlock: |
3214 | pthread_mutex_unlock(&ua_sess->lock); | |
487cf67c | 3215 | error: |
ffe60014 | 3216 | if (ua_sess) { |
d0b96690 | 3217 | destroy_app_session(app, ua_sess); |
ffe60014 | 3218 | } |
487cf67c DG |
3219 | rcu_read_unlock(); |
3220 | return; | |
3221 | } | |
55cc08a6 DG |
3222 | |
3223 | /* | |
3224 | * Add context to a specific channel for global UST domain. | |
3225 | */ | |
3226 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
3227 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
3228 | { | |
3229 | int ret = 0; | |
bec39940 DG |
3230 | struct lttng_ht_node_str *ua_chan_node; |
3231 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
3232 | struct ust_app_channel *ua_chan = NULL; |
3233 | struct ust_app_session *ua_sess; | |
3234 | struct ust_app *app; | |
3235 | ||
3236 | rcu_read_lock(); | |
3237 | ||
852d0037 | 3238 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3239 | if (!app->compatible) { |
3240 | /* | |
3241 | * TODO: In time, we should notice the caller of this error by | |
3242 | * telling him that this is a version error. | |
3243 | */ | |
3244 | continue; | |
3245 | } | |
55cc08a6 DG |
3246 | ua_sess = lookup_session_by_app(usess, app); |
3247 | if (ua_sess == NULL) { | |
3248 | continue; | |
3249 | } | |
3250 | ||
d0b96690 | 3251 | pthread_mutex_lock(&ua_sess->lock); |
55cc08a6 | 3252 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3253 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3254 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 3255 | if (ua_chan_node == NULL) { |
d0b96690 | 3256 | goto next_app; |
55cc08a6 DG |
3257 | } |
3258 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
3259 | node); | |
55cc08a6 DG |
3260 | ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app); |
3261 | if (ret < 0) { | |
d0b96690 | 3262 | goto next_app; |
55cc08a6 | 3263 | } |
d0b96690 DG |
3264 | next_app: |
3265 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
3266 | } |
3267 | ||
55cc08a6 DG |
3268 | rcu_read_unlock(); |
3269 | return ret; | |
3270 | } | |
3271 | ||
76d45b40 DG |
3272 | /* |
3273 | * Enable event for a channel from a UST session for a specific PID. | |
3274 | */ | |
3275 | int ust_app_enable_event_pid(struct ltt_ust_session *usess, | |
3276 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
3277 | { | |
3278 | int ret = 0; | |
bec39940 | 3279 | struct lttng_ht_iter iter; |
18eace3b | 3280 | struct lttng_ht_node_str *ua_chan_node; |
76d45b40 DG |
3281 | struct ust_app *app; |
3282 | struct ust_app_session *ua_sess; | |
3283 | struct ust_app_channel *ua_chan; | |
3284 | struct ust_app_event *ua_event; | |
3285 | ||
3286 | DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid); | |
3287 | ||
3288 | rcu_read_lock(); | |
3289 | ||
3290 | app = ust_app_find_by_pid(pid); | |
3291 | if (app == NULL) { | |
3292 | ERR("UST app enable event per PID %d not found", pid); | |
3293 | ret = -1; | |
d0b96690 | 3294 | goto end; |
76d45b40 DG |
3295 | } |
3296 | ||
e0c7ec2b DG |
3297 | if (!app->compatible) { |
3298 | ret = 0; | |
d0b96690 | 3299 | goto end; |
e0c7ec2b DG |
3300 | } |
3301 | ||
76d45b40 | 3302 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3303 | if (!ua_sess) { |
3304 | /* The application has problem or is probably dead. */ | |
d0b96690 DG |
3305 | ret = 0; |
3306 | goto end; | |
c4a1715b | 3307 | } |
76d45b40 | 3308 | |
d0b96690 | 3309 | pthread_mutex_lock(&ua_sess->lock); |
76d45b40 | 3310 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3311 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
3312 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
76d45b40 DG |
3313 | /* If the channel is not found, there is a code flow error */ |
3314 | assert(ua_chan_node); | |
3315 | ||
3316 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3317 | ||
18eace3b DG |
3318 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
3319 | uevent->filter, uevent->attr.loglevel); | |
3320 | if (ua_event == NULL) { | |
76d45b40 DG |
3321 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
3322 | if (ret < 0) { | |
d0b96690 | 3323 | goto end_unlock; |
76d45b40 DG |
3324 | } |
3325 | } else { | |
76d45b40 DG |
3326 | ret = enable_ust_app_event(ua_sess, ua_event, app); |
3327 | if (ret < 0) { | |
d0b96690 | 3328 | goto end_unlock; |
76d45b40 DG |
3329 | } |
3330 | } | |
3331 | ||
d0b96690 DG |
3332 | end_unlock: |
3333 | pthread_mutex_unlock(&ua_sess->lock); | |
3334 | end: | |
76d45b40 DG |
3335 | rcu_read_unlock(); |
3336 | return ret; | |
3337 | } | |
7f79d3a1 DG |
3338 | |
3339 | /* | |
3340 | * Disable event for a channel from a UST session for a specific PID. | |
3341 | */ | |
3342 | int ust_app_disable_event_pid(struct ltt_ust_session *usess, | |
3343 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
3344 | { | |
3345 | int ret = 0; | |
bec39940 DG |
3346 | struct lttng_ht_iter iter; |
3347 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
7f79d3a1 DG |
3348 | struct ust_app *app; |
3349 | struct ust_app_session *ua_sess; | |
3350 | struct ust_app_channel *ua_chan; | |
3351 | struct ust_app_event *ua_event; | |
3352 | ||
3353 | DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid); | |
3354 | ||
3355 | rcu_read_lock(); | |
3356 | ||
3357 | app = ust_app_find_by_pid(pid); | |
3358 | if (app == NULL) { | |
3359 | ERR("UST app disable event per PID %d not found", pid); | |
3360 | ret = -1; | |
3361 | goto error; | |
3362 | } | |
3363 | ||
e0c7ec2b DG |
3364 | if (!app->compatible) { |
3365 | ret = 0; | |
3366 | goto error; | |
3367 | } | |
3368 | ||
7f79d3a1 | 3369 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3370 | if (!ua_sess) { |
3371 | /* The application has problem or is probably dead. */ | |
3372 | goto error; | |
3373 | } | |
7f79d3a1 DG |
3374 | |
3375 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3376 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
3377 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
7f79d3a1 DG |
3378 | if (ua_chan_node == NULL) { |
3379 | /* Channel does not exist, skip disabling */ | |
3380 | goto error; | |
3381 | } | |
3382 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3383 | ||
bec39940 DG |
3384 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter); |
3385 | ua_event_node = lttng_ht_iter_get_node_str(&iter); | |
7f79d3a1 DG |
3386 | if (ua_event_node == NULL) { |
3387 | /* Event does not exist, skip disabling */ | |
3388 | goto error; | |
3389 | } | |
3390 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
3391 | ||
3392 | ret = disable_ust_app_event(ua_sess, ua_event, app); | |
3393 | if (ret < 0) { | |
3394 | goto error; | |
3395 | } | |
3396 | ||
3397 | error: | |
3398 | rcu_read_unlock(); | |
3399 | return ret; | |
3400 | } | |
e0c7ec2b | 3401 | |
4466912f DG |
3402 | /* |
3403 | * Calibrate registered applications. | |
3404 | */ | |
3405 | int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate) | |
3406 | { | |
3407 | int ret = 0; | |
3408 | struct lttng_ht_iter iter; | |
3409 | struct ust_app *app; | |
3410 | ||
3411 | rcu_read_lock(); | |
3412 | ||
852d0037 | 3413 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4466912f DG |
3414 | if (!app->compatible) { |
3415 | /* | |
3416 | * TODO: In time, we should notice the caller of this error by | |
3417 | * telling him that this is a version error. | |
3418 | */ | |
3419 | continue; | |
3420 | } | |
3421 | ||
840cb59c | 3422 | health_code_update(); |
86acf0da | 3423 | |
852d0037 | 3424 | ret = ustctl_calibrate(app->sock, calibrate); |
4466912f DG |
3425 | if (ret < 0) { |
3426 | switch (ret) { | |
3427 | case -ENOSYS: | |
3428 | /* Means that it's not implemented on the tracer side. */ | |
3429 | ret = 0; | |
3430 | break; | |
3431 | default: | |
4466912f | 3432 | DBG2("Calibrate app PID %d returned with error %d", |
852d0037 | 3433 | app->pid, ret); |
4466912f DG |
3434 | break; |
3435 | } | |
3436 | } | |
3437 | } | |
3438 | ||
3439 | DBG("UST app global domain calibration finished"); | |
3440 | ||
3441 | rcu_read_unlock(); | |
3442 | ||
840cb59c | 3443 | health_code_update(); |
86acf0da | 3444 | |
4466912f DG |
3445 | return ret; |
3446 | } | |
d0b96690 DG |
3447 | |
3448 | /* | |
3449 | * Receive registration and populate the given msg structure. | |
3450 | * | |
3451 | * On success return 0 else a negative value returned by the ustctl call. | |
3452 | */ | |
3453 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
3454 | { | |
3455 | int ret; | |
3456 | uint32_t pid, ppid, uid, gid; | |
3457 | ||
3458 | assert(msg); | |
3459 | ||
3460 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
3461 | &pid, &ppid, &uid, &gid, | |
3462 | &msg->bits_per_long, | |
3463 | &msg->uint8_t_alignment, | |
3464 | &msg->uint16_t_alignment, | |
3465 | &msg->uint32_t_alignment, | |
3466 | &msg->uint64_t_alignment, | |
3467 | &msg->long_alignment, | |
3468 | &msg->byte_order, | |
3469 | msg->name); | |
3470 | if (ret < 0) { | |
3471 | switch (-ret) { | |
3472 | case EPIPE: | |
3473 | case ECONNRESET: | |
3474 | case LTTNG_UST_ERR_EXITING: | |
3475 | DBG3("UST app recv reg message failed. Application died"); | |
3476 | break; | |
3477 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
3478 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
3479 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
3480 | LTTNG_UST_ABI_MINOR_VERSION); | |
3481 | break; | |
3482 | default: | |
3483 | ERR("UST app recv reg message failed with ret %d", ret); | |
3484 | break; | |
3485 | } | |
3486 | goto error; | |
3487 | } | |
3488 | msg->pid = (pid_t) pid; | |
3489 | msg->ppid = (pid_t) ppid; | |
3490 | msg->uid = (uid_t) uid; | |
3491 | msg->gid = (gid_t) gid; | |
3492 | ||
3493 | error: | |
3494 | return ret; | |
3495 | } | |
3496 | ||
d88aee68 DG |
3497 | /* |
3498 | * Return a ust app channel object using the application object and the channel | |
3499 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
3500 | * lock MUST be acquired before calling this function. | |
3501 | */ | |
d0b96690 DG |
3502 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
3503 | int objd) | |
3504 | { | |
3505 | struct lttng_ht_node_ulong *node; | |
3506 | struct lttng_ht_iter iter; | |
3507 | struct ust_app_channel *ua_chan = NULL; | |
3508 | ||
3509 | assert(app); | |
3510 | ||
3511 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
3512 | node = lttng_ht_iter_get_node_ulong(&iter); | |
3513 | if (node == NULL) { | |
3514 | DBG2("UST app channel find by objd %d not found", objd); | |
3515 | goto error; | |
3516 | } | |
3517 | ||
3518 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
3519 | ||
3520 | error: | |
3521 | return ua_chan; | |
3522 | } | |
3523 | ||
d88aee68 DG |
3524 | /* |
3525 | * Reply to a register channel notification from an application on the notify | |
3526 | * socket. The channel metadata is also created. | |
3527 | * | |
3528 | * The session UST registry lock is acquired in this function. | |
3529 | * | |
3530 | * On success 0 is returned else a negative value. | |
3531 | */ | |
d0b96690 DG |
3532 | static int reply_ust_register_channel(int sock, int sobjd, int cobjd, |
3533 | size_t nr_fields, struct ustctl_field *fields) | |
3534 | { | |
3535 | int ret, ret_code = 0; | |
3536 | uint32_t chan_id, reg_count; | |
3537 | enum ustctl_channel_header type; | |
3538 | struct ust_app *app; | |
3539 | struct ust_app_channel *ua_chan; | |
3540 | struct ust_app_session *ua_sess; | |
45893984 | 3541 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
3542 | |
3543 | rcu_read_lock(); | |
3544 | ||
3545 | /* Lookup application. If not found, there is a code flow error. */ | |
3546 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
3547 | if (!app) { |
3548 | DBG("Application socket %d is being teardown. Abort event notify", | |
3549 | sock); | |
3550 | ret = 0; | |
3551 | goto error_rcu_unlock; | |
3552 | } | |
d0b96690 DG |
3553 | |
3554 | /* Lookup channel by UST object descriptor. Should always be found. */ | |
3555 | ua_chan = find_channel_by_objd(app, cobjd); | |
3556 | assert(ua_chan); | |
3557 | assert(ua_chan->session); | |
3558 | ua_sess = ua_chan->session; | |
d0b96690 | 3559 | |
45893984 DG |
3560 | pthread_mutex_lock(&ua_sess->registry->lock); |
3561 | ||
3562 | chan_reg = ust_registry_channel_find(ua_sess->registry, ua_chan->key); | |
3563 | assert(chan_reg); | |
d0b96690 | 3564 | |
45893984 | 3565 | if (ust_registry_is_max_id(ua_sess->registry->used_channel_id)) { |
d0b96690 DG |
3566 | ret_code = -1; |
3567 | chan_id = -1U; | |
3568 | type = -1; | |
3569 | goto reply; | |
3570 | } | |
3571 | ||
3572 | /* Don't assign ID to metadata. */ | |
3573 | if (ua_chan->attr.type == LTTNG_UST_CHAN_METADATA) { | |
3574 | chan_id = -1U; | |
3575 | } else { | |
45893984 | 3576 | chan_id = ust_registry_get_next_chan_id(ua_sess->registry); |
d0b96690 DG |
3577 | } |
3578 | ||
45893984 | 3579 | reg_count = ust_registry_get_event_count(chan_reg); |
d0b96690 DG |
3580 | if (reg_count < 31) { |
3581 | type = USTCTL_CHANNEL_HEADER_COMPACT; | |
3582 | } else { | |
3583 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
3584 | } | |
3585 | ||
45893984 DG |
3586 | chan_reg->nr_ctx_fields = nr_fields; |
3587 | chan_reg->ctx_fields = fields; | |
3588 | chan_reg->chan_id = chan_id; | |
3589 | chan_reg->header_type = type; | |
d0b96690 DG |
3590 | |
3591 | /* Append to metadata */ | |
3592 | if (!ret_code) { | |
45893984 DG |
3593 | ret_code = ust_metadata_channel_statedump(ua_chan->session->registry, |
3594 | chan_reg); | |
d0b96690 DG |
3595 | if (ret_code) { |
3596 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
3597 | goto reply; | |
3598 | } | |
3599 | } | |
3600 | ||
3601 | reply: | |
3602 | DBG3("UST app replying to register channel with id %u, type: %d, ret: %d", | |
3603 | chan_id, type, ret_code); | |
3604 | ||
3605 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
3606 | if (ret < 0) { | |
3607 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3608 | ERR("UST app reply channel failed with ret %d", ret); | |
3609 | } else { | |
3610 | DBG3("UST app reply channel failed. Application died"); | |
3611 | } | |
3612 | goto error; | |
3613 | } | |
3614 | ||
3615 | error: | |
45893984 | 3616 | pthread_mutex_unlock(&ua_sess->registry->lock); |
d88aee68 | 3617 | error_rcu_unlock: |
d0b96690 DG |
3618 | rcu_read_unlock(); |
3619 | return ret; | |
3620 | } | |
3621 | ||
d88aee68 DG |
3622 | /* |
3623 | * Add event to the UST channel registry. When the event is added to the | |
3624 | * registry, the metadata is also created. Once done, this replies to the | |
3625 | * application with the appropriate error code. | |
3626 | * | |
3627 | * The session UST registry lock is acquired in the function. | |
3628 | * | |
3629 | * On success 0 is returned else a negative value. | |
3630 | */ | |
d0b96690 DG |
3631 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
3632 | char *sig, size_t nr_fields, struct ustctl_field *fields, int loglevel, | |
3633 | char *model_emf_uri) | |
3634 | { | |
3635 | int ret, ret_code; | |
3636 | uint32_t event_id = 0; | |
3637 | struct ust_app *app; | |
3638 | struct ust_app_channel *ua_chan; | |
3639 | struct ust_app_session *ua_sess; | |
3640 | ||
3641 | rcu_read_lock(); | |
3642 | ||
3643 | /* Lookup application. If not found, there is a code flow error. */ | |
3644 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
3645 | if (!app) { |
3646 | DBG("Application socket %d is being teardown. Abort event notify", | |
3647 | sock); | |
3648 | ret = 0; | |
3649 | goto error_rcu_unlock; | |
3650 | } | |
d0b96690 DG |
3651 | |
3652 | /* Lookup channel by UST object descriptor. Should always be found. */ | |
3653 | ua_chan = find_channel_by_objd(app, cobjd); | |
3654 | assert(ua_chan); | |
3655 | assert(ua_chan->session); | |
3656 | ua_sess = ua_chan->session; | |
3657 | ||
45893984 | 3658 | pthread_mutex_lock(&ua_sess->registry->lock); |
d0b96690 | 3659 | |
45893984 DG |
3660 | ret_code = ust_registry_create_event(ua_sess->registry, ua_chan->key, |
3661 | sobjd, cobjd, name, sig, nr_fields, fields, loglevel, | |
3662 | model_emf_uri, &event_id); | |
d0b96690 DG |
3663 | |
3664 | /* | |
3665 | * The return value is returned to ustctl so in case of an error, the | |
3666 | * application can be notified. In case of an error, it's important not to | |
3667 | * return a negative error or else the application will get closed. | |
3668 | */ | |
3669 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
3670 | if (ret < 0) { | |
3671 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3672 | ERR("UST app reply event failed with ret %d", ret); | |
3673 | } else { | |
3674 | DBG3("UST app reply event failed. Application died"); | |
3675 | } | |
3676 | /* | |
3677 | * No need to wipe the create event since the application socket will | |
3678 | * get close on error hence cleaning up everything by itself. | |
3679 | */ | |
3680 | goto error; | |
3681 | } | |
3682 | ||
d88aee68 DG |
3683 | DBG3("UST registry event %s has been added successfully", name); |
3684 | ||
d0b96690 | 3685 | error: |
45893984 | 3686 | pthread_mutex_unlock(&ua_sess->registry->lock); |
d88aee68 | 3687 | error_rcu_unlock: |
d0b96690 DG |
3688 | rcu_read_unlock(); |
3689 | return ret; | |
3690 | } | |
3691 | ||
d88aee68 DG |
3692 | /* |
3693 | * Handle application notification through the given notify socket. | |
3694 | * | |
3695 | * Return 0 on success or else a negative value. | |
3696 | */ | |
d0b96690 DG |
3697 | int ust_app_recv_notify(int sock) |
3698 | { | |
3699 | int ret; | |
3700 | enum ustctl_notify_cmd cmd; | |
3701 | ||
3702 | DBG3("UST app receiving notify from sock %d", sock); | |
3703 | ||
3704 | ret = ustctl_recv_notify(sock, &cmd); | |
3705 | if (ret < 0) { | |
3706 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3707 | ERR("UST app recv notify failed with ret %d", ret); | |
3708 | } else { | |
3709 | DBG3("UST app recv notify failed. Application died"); | |
3710 | } | |
3711 | goto error; | |
3712 | } | |
3713 | ||
3714 | switch (cmd) { | |
3715 | case USTCTL_NOTIFY_CMD_EVENT: | |
3716 | { | |
3717 | int sobjd, cobjd, loglevel; | |
3718 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; | |
3719 | size_t nr_fields; | |
3720 | struct ustctl_field *fields; | |
3721 | ||
3722 | DBG2("UST app ustctl register event received"); | |
3723 | ||
3724 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, &loglevel, | |
3725 | &sig, &nr_fields, &fields, &model_emf_uri); | |
3726 | if (ret < 0) { | |
3727 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3728 | ERR("UST app recv event failed with ret %d", ret); | |
3729 | } else { | |
3730 | DBG3("UST app recv event failed. Application died"); | |
3731 | } | |
3732 | goto error; | |
3733 | } | |
3734 | ||
3735 | /* Add event to the UST registry coming from the notify socket. */ | |
3736 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, | |
3737 | fields, loglevel, model_emf_uri); | |
3738 | if (ret < 0) { | |
3739 | goto error; | |
3740 | } | |
3741 | ||
3742 | break; | |
3743 | } | |
3744 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
3745 | { | |
3746 | int sobjd, cobjd; | |
3747 | size_t nr_fields; | |
3748 | struct ustctl_field *fields; | |
3749 | ||
3750 | DBG2("UST app ustctl register channel received"); | |
3751 | ||
3752 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
3753 | &fields); | |
3754 | if (ret < 0) { | |
3755 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3756 | ERR("UST app recv channel failed with ret %d", ret); | |
3757 | } else { | |
3758 | DBG3("UST app recv channel failed. Application died"); | |
3759 | } | |
3760 | goto error; | |
3761 | } | |
3762 | ||
3763 | ret = reply_ust_register_channel(sock, sobjd, cobjd, nr_fields, | |
3764 | fields); | |
3765 | if (ret < 0) { | |
3766 | goto error; | |
3767 | } | |
3768 | ||
3769 | break; | |
3770 | } | |
3771 | default: | |
3772 | /* Should NEVER happen. */ | |
3773 | assert(0); | |
3774 | } | |
3775 | ||
3776 | error: | |
3777 | return ret; | |
3778 | } | |
d88aee68 DG |
3779 | |
3780 | /* | |
3781 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
3782 | * corresponding application. On failure, the call_rcu to close the socket is | |
3783 | * executed. If an application is found, it tries to delete it from the notify | |
3784 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
3785 | * | |
3786 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
3787 | * call RCU is not done but the rest of the cleanup is. | |
3788 | */ | |
3789 | void ust_app_notify_sock_unregister(int sock) | |
3790 | { | |
3791 | int err_enomem = 0; | |
3792 | struct lttng_ht_iter iter; | |
3793 | struct ust_app *app; | |
3794 | struct ust_app_notify_sock_obj *obj; | |
3795 | ||
3796 | assert(sock >= 0); | |
3797 | ||
3798 | rcu_read_lock(); | |
3799 | ||
3800 | obj = zmalloc(sizeof(*obj)); | |
3801 | if (!obj) { | |
3802 | /* | |
3803 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
3804 | * procedure but the call_rcu will not be called. In this case, we | |
3805 | * accept the fd leak rather than possibly creating an unsynchronized | |
3806 | * state between threads. | |
3807 | * | |
3808 | * TODO: The notify object should be created once the notify socket is | |
3809 | * registered and stored independantely from the ust app object. The | |
3810 | * tricky part is to synchronize the teardown of the application and | |
3811 | * this notify object. Let's keep that in mind so we can avoid this | |
3812 | * kind of shenanigans with ENOMEM in the teardown path. | |
3813 | */ | |
3814 | err_enomem = 1; | |
3815 | } else { | |
3816 | obj->fd = sock; | |
3817 | } | |
3818 | ||
3819 | DBG("UST app notify socket unregister %d", sock); | |
3820 | ||
3821 | /* | |
3822 | * Lookup application by notify socket. If this fails, this means that the | |
3823 | * hash table delete has already been done by the application | |
3824 | * unregistration process so we can safely close the notify socket in a | |
3825 | * call RCU. | |
3826 | */ | |
3827 | app = find_app_by_notify_sock(sock); | |
3828 | if (!app) { | |
3829 | goto close_socket; | |
3830 | } | |
3831 | ||
3832 | iter.iter.node = &app->notify_sock_n.node; | |
3833 | ||
3834 | /* | |
3835 | * Whatever happens here either we fail or succeed, in both cases we have | |
3836 | * to close the socket after a grace period to continue to the call RCU | |
3837 | * here. If the deletion is successful, the application is not visible | |
3838 | * anymore by other threads and is it fails it means that it was already | |
3839 | * deleted from the hash table so either way we just have to close the | |
3840 | * socket. | |
3841 | */ | |
3842 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3843 | ||
3844 | close_socket: | |
3845 | rcu_read_unlock(); | |
3846 | ||
3847 | /* | |
3848 | * Close socket after a grace period to avoid for the socket to be reused | |
3849 | * before the application object is freed creating potential race between | |
3850 | * threads trying to add unique in the global hash table. | |
3851 | */ | |
3852 | if (!err_enomem) { | |
3853 | call_rcu(&obj->head, close_notify_sock_rcu); | |
3854 | } | |
3855 | } |