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