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); | |
76 | ||
77 | end: | |
78 | return socket; | |
79 | } | |
80 | ||
025faf73 DG |
81 | /* |
82 | * Match function for the hash table lookup. | |
83 | * | |
84 | * It matches an ust app event based on three attributes which are the event | |
85 | * name, the filter bytecode and the loglevel. | |
86 | */ | |
18eace3b DG |
87 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
88 | { | |
89 | struct ust_app_event *event; | |
90 | const struct ust_app_ht_key *key; | |
91 | ||
92 | assert(node); | |
93 | assert(_key); | |
94 | ||
95 | event = caa_container_of(node, struct ust_app_event, node.node); | |
96 | key = _key; | |
97 | ||
98 | /* Match the 3 elements of the key: name, filter and loglevel. */ | |
99 | ||
100 | /* Event name */ | |
101 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
102 | goto no_match; | |
103 | } | |
104 | ||
105 | /* Event loglevel. */ | |
106 | if (event->attr.loglevel != key->loglevel) { | |
025faf73 DG |
107 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
108 | && key->loglevel == 0 && event->attr.loglevel == -1) { | |
109 | /* | |
110 | * Match is accepted. This is because on event creation, the | |
111 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
112 | * -1 are accepted for this loglevel type since 0 is the one set by | |
113 | * the API when receiving an enable event. | |
114 | */ | |
115 | } else { | |
116 | goto no_match; | |
117 | } | |
18eace3b DG |
118 | } |
119 | ||
120 | /* One of the filters is NULL, fail. */ | |
121 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
122 | goto no_match; | |
123 | } | |
124 | ||
025faf73 DG |
125 | if (key->filter && event->filter) { |
126 | /* Both filters exists, check length followed by the bytecode. */ | |
127 | if (event->filter->len != key->filter->len || | |
128 | memcmp(event->filter->data, key->filter->data, | |
129 | event->filter->len) != 0) { | |
130 | goto no_match; | |
131 | } | |
18eace3b DG |
132 | } |
133 | ||
025faf73 | 134 | /* Match. */ |
18eace3b DG |
135 | return 1; |
136 | ||
137 | no_match: | |
138 | return 0; | |
18eace3b DG |
139 | } |
140 | ||
025faf73 DG |
141 | /* |
142 | * Unique add of an ust app event in the given ht. This uses the custom | |
143 | * ht_match_ust_app_event match function and the event name as hash. | |
144 | */ | |
18eace3b DG |
145 | static void add_unique_ust_app_event(struct lttng_ht *ht, |
146 | struct ust_app_event *event) | |
147 | { | |
148 | struct cds_lfht_node *node_ptr; | |
149 | struct ust_app_ht_key key; | |
150 | ||
151 | assert(ht); | |
152 | assert(ht->ht); | |
153 | assert(event); | |
154 | ||
155 | key.name = event->attr.name; | |
156 | key.filter = event->filter; | |
157 | key.loglevel = event->attr.loglevel; | |
158 | ||
159 | node_ptr = cds_lfht_add_unique(ht->ht, | |
160 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
161 | ht_match_ust_app_event, &key, &event->node.node); | |
162 | assert(node_ptr == &event->node.node); | |
163 | } | |
164 | ||
55cc08a6 DG |
165 | /* |
166 | * Delete ust context safely. RCU read lock must be held before calling | |
167 | * this function. | |
168 | */ | |
169 | static | |
170 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx) | |
171 | { | |
ffe60014 DG |
172 | int ret; |
173 | ||
174 | assert(ua_ctx); | |
175 | ||
55cc08a6 | 176 | if (ua_ctx->obj) { |
ffe60014 DG |
177 | ret = ustctl_release_object(sock, ua_ctx->obj); |
178 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
179 | ERR("UST app sock %d release context obj failed with ret %d", | |
180 | sock, ret); | |
181 | } | |
55cc08a6 DG |
182 | free(ua_ctx->obj); |
183 | } | |
184 | free(ua_ctx); | |
185 | } | |
186 | ||
d80a6244 DG |
187 | /* |
188 | * Delete ust app event safely. RCU read lock must be held before calling | |
189 | * this function. | |
190 | */ | |
8b366481 DG |
191 | static |
192 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event) | |
d80a6244 | 193 | { |
ffe60014 DG |
194 | int ret; |
195 | ||
196 | assert(ua_event); | |
197 | ||
53a80697 | 198 | free(ua_event->filter); |
d80a6244 | 199 | |
edb67388 | 200 | if (ua_event->obj != NULL) { |
ffe60014 DG |
201 | ret = ustctl_release_object(sock, ua_event->obj); |
202 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
203 | ERR("UST app sock %d release event obj failed with ret %d", | |
204 | sock, ret); | |
205 | } | |
edb67388 DG |
206 | free(ua_event->obj); |
207 | } | |
d80a6244 DG |
208 | free(ua_event); |
209 | } | |
210 | ||
211 | /* | |
212 | * Delete ust app stream safely. RCU read lock must be held before calling | |
213 | * this function. | |
214 | */ | |
8b366481 | 215 | static |
030a66fa | 216 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream) |
d80a6244 | 217 | { |
ffe60014 DG |
218 | int ret; |
219 | ||
220 | assert(stream); | |
221 | ||
8b366481 | 222 | if (stream->obj) { |
ffe60014 DG |
223 | ret = ustctl_release_object(sock, stream->obj); |
224 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
225 | ERR("UST app sock %d release stream obj failed with ret %d", | |
226 | sock, ret); | |
227 | } | |
4063050c | 228 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
229 | free(stream->obj); |
230 | } | |
84cd17c6 | 231 | free(stream); |
d80a6244 DG |
232 | } |
233 | ||
234 | /* | |
235 | * Delete ust app channel safely. RCU read lock must be held before calling | |
236 | * this function. | |
237 | */ | |
8b366481 DG |
238 | static |
239 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan) | |
d80a6244 DG |
240 | { |
241 | int ret; | |
bec39940 | 242 | struct lttng_ht_iter iter; |
d80a6244 | 243 | struct ust_app_event *ua_event; |
55cc08a6 | 244 | struct ust_app_ctx *ua_ctx; |
030a66fa | 245 | struct ust_app_stream *stream, *stmp; |
d80a6244 | 246 | |
ffe60014 DG |
247 | assert(ua_chan); |
248 | ||
249 | DBG3("UST app deleting channel %s", ua_chan->name); | |
250 | ||
55cc08a6 | 251 | /* Wipe stream */ |
d80a6244 | 252 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 253 | cds_list_del(&stream->list); |
d80a6244 DG |
254 | delete_ust_app_stream(sock, stream); |
255 | } | |
256 | ||
55cc08a6 | 257 | /* Wipe context */ |
bec39940 DG |
258 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
259 | ret = lttng_ht_del(ua_chan->ctx, &iter); | |
55cc08a6 DG |
260 | assert(!ret); |
261 | delete_ust_app_ctx(sock, ua_ctx); | |
262 | } | |
bec39940 | 263 | lttng_ht_destroy(ua_chan->ctx); |
d80a6244 | 264 | |
55cc08a6 | 265 | /* Wipe events */ |
bec39940 DG |
266 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
267 | node.node) { | |
268 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 269 | assert(!ret); |
d80a6244 DG |
270 | delete_ust_app_event(sock, ua_event); |
271 | } | |
bec39940 | 272 | lttng_ht_destroy(ua_chan->events); |
edb67388 DG |
273 | |
274 | if (ua_chan->obj != NULL) { | |
ffe60014 DG |
275 | ret = ustctl_release_object(sock, ua_chan->obj); |
276 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
277 | ERR("UST app sock %d release channel obj failed with ret %d", | |
278 | sock, ret); | |
279 | } | |
4063050c | 280 | lttng_fd_put(LTTNG_FD_APPS, 2); |
edb67388 DG |
281 | free(ua_chan->obj); |
282 | } | |
84cd17c6 | 283 | free(ua_chan); |
d80a6244 DG |
284 | } |
285 | ||
286 | /* | |
287 | * Delete ust app session safely. RCU read lock must be held before calling | |
288 | * this function. | |
289 | */ | |
8b366481 DG |
290 | static |
291 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess) | |
d80a6244 DG |
292 | { |
293 | int ret; | |
bec39940 | 294 | struct lttng_ht_iter iter; |
d80a6244 DG |
295 | struct ust_app_channel *ua_chan; |
296 | ||
297 | if (ua_sess->metadata) { | |
ffe60014 | 298 | delete_ust_app_channel(sock, ua_sess->metadata); |
d80a6244 DG |
299 | } |
300 | ||
bec39940 DG |
301 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
302 | node.node) { | |
303 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 304 | assert(!ret); |
d80a6244 DG |
305 | delete_ust_app_channel(sock, ua_chan); |
306 | } | |
bec39940 | 307 | lttng_ht_destroy(ua_sess->channels); |
d80a6244 | 308 | |
aee6bafd | 309 | if (ua_sess->handle != -1) { |
ffe60014 DG |
310 | ret = ustctl_release_handle(sock, ua_sess->handle); |
311 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
312 | ERR("UST app sock %d release session handle failed with ret %d", | |
313 | sock, ret); | |
314 | } | |
aee6bafd | 315 | } |
8b366481 | 316 | free(ua_sess); |
d80a6244 | 317 | } |
91d76f53 DG |
318 | |
319 | /* | |
284d8f55 DG |
320 | * Delete a traceable application structure from the global list. Never call |
321 | * this function outside of a call_rcu call. | |
91d76f53 | 322 | */ |
8b366481 DG |
323 | static |
324 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 325 | { |
8b366481 | 326 | int ret, sock; |
d42f20df | 327 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 328 | |
f6a9efaa | 329 | rcu_read_lock(); |
44d3bd01 | 330 | |
d80a6244 | 331 | /* Delete ust app sessions info */ |
852d0037 DG |
332 | sock = app->sock; |
333 | app->sock = -1; | |
d80a6244 | 334 | |
d42f20df DG |
335 | lttng_ht_destroy(app->sessions); |
336 | ||
8b366481 | 337 | /* Wipe sessions */ |
d42f20df DG |
338 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
339 | teardown_node) { | |
340 | /* Free every object in the session and the session. */ | |
341 | delete_ust_app_session(sock, ua_sess); | |
d80a6244 | 342 | } |
d80a6244 | 343 | |
6414a713 | 344 | /* |
852d0037 DG |
345 | * Wait until we have deleted the application from the sock hash table |
346 | * before closing this socket, otherwise an application could re-use the | |
347 | * socket ID and race with the teardown, using the same hash table entry. | |
348 | * | |
349 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
350 | * all RCU readers that could run concurrently with unregister app, | |
351 | * therefore we _need_ to only close that socket after a grace period. So | |
352 | * it should stay in this RCU callback. | |
353 | * | |
354 | * This close() is a very important step of the synchronization model so | |
355 | * every modification to this function must be carefully reviewed. | |
6414a713 | 356 | */ |
799e2c4f MD |
357 | ret = close(sock); |
358 | if (ret) { | |
359 | PERROR("close"); | |
360 | } | |
4063050c | 361 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 362 | |
852d0037 | 363 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 364 | free(app); |
bec39940 | 365 | |
f6a9efaa | 366 | rcu_read_unlock(); |
099e26bd DG |
367 | } |
368 | ||
369 | /* | |
f6a9efaa | 370 | * URCU intermediate call to delete an UST app. |
099e26bd | 371 | */ |
8b366481 DG |
372 | static |
373 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 374 | { |
bec39940 DG |
375 | struct lttng_ht_node_ulong *node = |
376 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 377 | struct ust_app *app = |
852d0037 | 378 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 379 | |
852d0037 | 380 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 381 | delete_ust_app(app); |
099e26bd DG |
382 | } |
383 | ||
ffe60014 DG |
384 | /* |
385 | * Delete the session from the application ht and delete the data structure by | |
386 | * freeing every object inside and releasing them. | |
387 | */ | |
388 | static void destroy_session(struct ust_app *app, | |
389 | struct ust_app_session *ua_sess) | |
390 | { | |
391 | int ret; | |
392 | struct lttng_ht_iter iter; | |
393 | ||
394 | assert(app); | |
395 | assert(ua_sess); | |
396 | ||
397 | iter.iter.node = &ua_sess->node.node; | |
398 | ret = lttng_ht_del(app->sessions, &iter); | |
399 | if (ret) { | |
400 | /* Already scheduled for teardown. */ | |
401 | goto end; | |
402 | } | |
403 | ||
404 | /* Once deleted, free the data structure. */ | |
405 | delete_ust_app_session(app->sock, ua_sess); | |
406 | ||
407 | end: | |
408 | return; | |
409 | } | |
410 | ||
8b366481 DG |
411 | /* |
412 | * Alloc new UST app session. | |
413 | */ | |
414 | static | |
415 | struct ust_app_session *alloc_ust_app_session(void) | |
416 | { | |
417 | struct ust_app_session *ua_sess; | |
418 | ||
419 | /* Init most of the default value by allocating and zeroing */ | |
420 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
421 | if (ua_sess == NULL) { | |
422 | PERROR("malloc"); | |
ffe60014 | 423 | goto error_free; |
8b366481 DG |
424 | } |
425 | ||
426 | ua_sess->handle = -1; | |
bec39940 | 427 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
8b366481 | 428 | |
ffe60014 DG |
429 | if ((lttng_uuid_generate(ua_sess->uuid))) { |
430 | ERR("Failed to generate UST uuid"); | |
431 | goto error; | |
432 | } | |
433 | ||
8b366481 DG |
434 | return ua_sess; |
435 | ||
436 | error: | |
ffe60014 DG |
437 | free(ua_sess); |
438 | error_free: | |
8b366481 DG |
439 | return NULL; |
440 | } | |
441 | ||
442 | /* | |
443 | * Alloc new UST app channel. | |
444 | */ | |
445 | static | |
446 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
ffe60014 | 447 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
448 | { |
449 | struct ust_app_channel *ua_chan; | |
450 | ||
451 | /* Init most of the default value by allocating and zeroing */ | |
452 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
453 | if (ua_chan == NULL) { | |
454 | PERROR("malloc"); | |
455 | goto error; | |
456 | } | |
457 | ||
458 | /* Setup channel name */ | |
459 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
460 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
461 | ||
462 | ua_chan->enabled = 1; | |
463 | ua_chan->handle = -1; | |
ffe60014 | 464 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
465 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
466 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
467 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
468 | |
469 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
470 | ||
471 | /* Copy attributes */ | |
472 | if (attr) { | |
ffe60014 | 473 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
474 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
475 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
476 | ua_chan->attr.overwrite = attr->overwrite; | |
477 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
478 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
479 | ua_chan->attr.output = attr->output; | |
8b366481 | 480 | } |
ffe60014 DG |
481 | /* By default, the channel is a per cpu channel. */ |
482 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
483 | |
484 | DBG3("UST app channel %s allocated", ua_chan->name); | |
485 | ||
486 | return ua_chan; | |
487 | ||
488 | error: | |
489 | return NULL; | |
490 | } | |
491 | ||
37f1c236 DG |
492 | /* |
493 | * Allocate and initialize a UST app stream. | |
494 | * | |
495 | * Return newly allocated stream pointer or NULL on error. | |
496 | */ | |
ffe60014 | 497 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
498 | { |
499 | struct ust_app_stream *stream = NULL; | |
500 | ||
501 | stream = zmalloc(sizeof(*stream)); | |
502 | if (stream == NULL) { | |
503 | PERROR("zmalloc ust app stream"); | |
504 | goto error; | |
505 | } | |
506 | ||
507 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
508 | stream->handle = -1; | |
509 | ||
510 | error: | |
511 | return stream; | |
512 | } | |
513 | ||
8b366481 DG |
514 | /* |
515 | * Alloc new UST app event. | |
516 | */ | |
517 | static | |
518 | struct ust_app_event *alloc_ust_app_event(char *name, | |
519 | struct lttng_ust_event *attr) | |
520 | { | |
521 | struct ust_app_event *ua_event; | |
522 | ||
523 | /* Init most of the default value by allocating and zeroing */ | |
524 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
525 | if (ua_event == NULL) { | |
526 | PERROR("malloc"); | |
527 | goto error; | |
528 | } | |
529 | ||
530 | ua_event->enabled = 1; | |
531 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
532 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 533 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
534 | |
535 | /* Copy attributes */ | |
536 | if (attr) { | |
537 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
538 | } | |
539 | ||
540 | DBG3("UST app event %s allocated", ua_event->name); | |
541 | ||
542 | return ua_event; | |
543 | ||
544 | error: | |
545 | return NULL; | |
546 | } | |
547 | ||
548 | /* | |
549 | * Alloc new UST app context. | |
550 | */ | |
551 | static | |
552 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx) | |
553 | { | |
554 | struct ust_app_ctx *ua_ctx; | |
555 | ||
556 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
557 | if (ua_ctx == NULL) { | |
558 | goto error; | |
559 | } | |
560 | ||
561 | if (uctx) { | |
562 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
563 | } | |
564 | ||
565 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
566 | ||
567 | error: | |
568 | return ua_ctx; | |
569 | } | |
570 | ||
025faf73 DG |
571 | /* |
572 | * Allocate a filter and copy the given original filter. | |
573 | * | |
574 | * Return allocated filter or NULL on error. | |
575 | */ | |
576 | static struct lttng_ust_filter_bytecode *alloc_copy_ust_app_filter( | |
577 | struct lttng_ust_filter_bytecode *orig_f) | |
578 | { | |
579 | struct lttng_ust_filter_bytecode *filter = NULL; | |
580 | ||
581 | /* Copy filter bytecode */ | |
582 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
583 | if (!filter) { | |
584 | PERROR("zmalloc alloc ust app filter"); | |
585 | goto error; | |
586 | } | |
587 | ||
588 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
589 | ||
590 | error: | |
591 | return filter; | |
592 | } | |
593 | ||
099e26bd | 594 | /* |
421cb601 DG |
595 | * Find an ust_app using the sock and return it. RCU read side lock must be |
596 | * held before calling this helper function. | |
099e26bd | 597 | */ |
8b366481 DG |
598 | static |
599 | struct ust_app *find_app_by_sock(int sock) | |
099e26bd | 600 | { |
bec39940 | 601 | struct lttng_ht_node_ulong *node; |
bec39940 | 602 | struct lttng_ht_iter iter; |
f6a9efaa | 603 | |
852d0037 | 604 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 605 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
606 | if (node == NULL) { |
607 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
608 | goto error; |
609 | } | |
852d0037 DG |
610 | |
611 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
612 | |
613 | error: | |
614 | return NULL; | |
099e26bd DG |
615 | } |
616 | ||
025faf73 DG |
617 | /* |
618 | * Lookup for an ust app event based on event name, filter bytecode and the | |
619 | * event loglevel. | |
620 | * | |
621 | * Return an ust_app_event object or NULL on error. | |
622 | */ | |
18eace3b DG |
623 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
624 | char *name, struct lttng_ust_filter_bytecode *filter, int loglevel) | |
625 | { | |
626 | struct lttng_ht_iter iter; | |
627 | struct lttng_ht_node_str *node; | |
628 | struct ust_app_event *event = NULL; | |
629 | struct ust_app_ht_key key; | |
18eace3b DG |
630 | |
631 | assert(name); | |
632 | assert(ht); | |
633 | ||
634 | /* Setup key for event lookup. */ | |
635 | key.name = name; | |
636 | key.filter = filter; | |
637 | key.loglevel = loglevel; | |
638 | ||
025faf73 DG |
639 | /* Lookup using the event name as hash and a custom match fct. */ |
640 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
641 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
642 | node = lttng_ht_iter_get_node_str(&iter); |
643 | if (node == NULL) { | |
644 | goto end; | |
645 | } | |
646 | ||
647 | event = caa_container_of(node, struct ust_app_event, node); | |
648 | ||
649 | end: | |
18eace3b DG |
650 | return event; |
651 | } | |
652 | ||
55cc08a6 DG |
653 | /* |
654 | * Create the channel context on the tracer. | |
655 | */ | |
656 | static | |
657 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
658 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
659 | { | |
660 | int ret; | |
661 | ||
840cb59c | 662 | health_code_update(); |
86acf0da | 663 | |
852d0037 | 664 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 DG |
665 | ua_chan->obj, &ua_ctx->obj); |
666 | if (ret < 0) { | |
ffe60014 DG |
667 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
668 | ERR("UST app create channel context failed for app (pid: %d) " | |
669 | "with ret %d", app->pid, ret); | |
670 | } else { | |
671 | DBG3("UST app disable event failed. Application is dead."); | |
672 | } | |
55cc08a6 DG |
673 | goto error; |
674 | } | |
675 | ||
676 | ua_ctx->handle = ua_ctx->obj->handle; | |
677 | ||
727d5404 | 678 | DBG2("UST app context created successfully for channel %s", ua_chan->name); |
55cc08a6 DG |
679 | |
680 | error: | |
840cb59c | 681 | health_code_update(); |
55cc08a6 DG |
682 | return ret; |
683 | } | |
684 | ||
53a80697 MD |
685 | /* |
686 | * Set the filter on the tracer. | |
687 | */ | |
688 | static | |
689 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
690 | struct ust_app *app) | |
691 | { | |
692 | int ret; | |
693 | ||
840cb59c | 694 | health_code_update(); |
86acf0da | 695 | |
53a80697 | 696 | if (!ua_event->filter) { |
86acf0da DG |
697 | ret = 0; |
698 | goto error; | |
53a80697 MD |
699 | } |
700 | ||
701 | ret = ustctl_set_filter(app->sock, ua_event->filter, | |
702 | ua_event->obj); | |
703 | if (ret < 0) { | |
ffe60014 DG |
704 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
705 | ERR("UST app event %s filter failed for app (pid: %d) " | |
706 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
707 | } else { | |
708 | DBG3("UST app filter event failed. Application is dead."); | |
709 | } | |
53a80697 MD |
710 | goto error; |
711 | } | |
712 | ||
713 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
714 | ||
715 | error: | |
840cb59c | 716 | health_code_update(); |
53a80697 MD |
717 | return ret; |
718 | } | |
719 | ||
9730260e DG |
720 | /* |
721 | * Disable the specified event on to UST tracer for the UST session. | |
722 | */ | |
723 | static int disable_ust_event(struct ust_app *app, | |
724 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
725 | { | |
726 | int ret; | |
727 | ||
840cb59c | 728 | health_code_update(); |
86acf0da | 729 | |
852d0037 | 730 | ret = ustctl_disable(app->sock, ua_event->obj); |
9730260e | 731 | if (ret < 0) { |
ffe60014 DG |
732 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
733 | ERR("UST app event %s disable failed for app (pid: %d) " | |
734 | "and session handle %d with ret %d", | |
735 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
736 | } else { | |
737 | DBG3("UST app disable event failed. Application is dead."); | |
738 | } | |
9730260e DG |
739 | goto error; |
740 | } | |
741 | ||
742 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 743 | ua_event->attr.name, app->pid); |
9730260e DG |
744 | |
745 | error: | |
840cb59c | 746 | health_code_update(); |
9730260e DG |
747 | return ret; |
748 | } | |
749 | ||
78f0bacd DG |
750 | /* |
751 | * Disable the specified channel on to UST tracer for the UST session. | |
752 | */ | |
753 | static int disable_ust_channel(struct ust_app *app, | |
754 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
755 | { | |
756 | int ret; | |
757 | ||
840cb59c | 758 | health_code_update(); |
86acf0da | 759 | |
852d0037 | 760 | ret = ustctl_disable(app->sock, ua_chan->obj); |
78f0bacd | 761 | if (ret < 0) { |
ffe60014 DG |
762 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
763 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
764 | "and session handle %d with ret %d", | |
765 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
766 | } else { | |
767 | DBG3("UST app disable channel failed. Application is dead."); | |
768 | } | |
78f0bacd DG |
769 | goto error; |
770 | } | |
771 | ||
78f0bacd | 772 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 773 | ua_chan->name, app->pid); |
78f0bacd DG |
774 | |
775 | error: | |
840cb59c | 776 | health_code_update(); |
78f0bacd DG |
777 | return ret; |
778 | } | |
779 | ||
780 | /* | |
781 | * Enable the specified channel on to UST tracer for the UST session. | |
782 | */ | |
783 | static int enable_ust_channel(struct ust_app *app, | |
784 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
785 | { | |
786 | int ret; | |
787 | ||
840cb59c | 788 | health_code_update(); |
86acf0da | 789 | |
852d0037 | 790 | ret = ustctl_enable(app->sock, ua_chan->obj); |
78f0bacd | 791 | if (ret < 0) { |
ffe60014 DG |
792 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
793 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
794 | "and session handle %d with ret %d", | |
795 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
796 | } else { | |
797 | DBG3("UST app enable channel failed. Application is dead."); | |
798 | } | |
78f0bacd DG |
799 | goto error; |
800 | } | |
801 | ||
802 | ua_chan->enabled = 1; | |
803 | ||
804 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 805 | ua_chan->name, app->pid); |
78f0bacd DG |
806 | |
807 | error: | |
840cb59c | 808 | health_code_update(); |
78f0bacd DG |
809 | return ret; |
810 | } | |
811 | ||
edb67388 DG |
812 | /* |
813 | * Enable the specified event on to UST tracer for the UST session. | |
814 | */ | |
815 | static int enable_ust_event(struct ust_app *app, | |
816 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
817 | { | |
818 | int ret; | |
819 | ||
840cb59c | 820 | health_code_update(); |
86acf0da | 821 | |
852d0037 | 822 | ret = ustctl_enable(app->sock, ua_event->obj); |
edb67388 | 823 | if (ret < 0) { |
ffe60014 DG |
824 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
825 | ERR("UST app event %s enable failed for app (pid: %d) " | |
826 | "and session handle %d with ret %d", | |
827 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
828 | } else { | |
829 | DBG3("UST app enable event failed. Application is dead."); | |
830 | } | |
edb67388 DG |
831 | goto error; |
832 | } | |
833 | ||
834 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 835 | ua_event->attr.name, app->pid); |
edb67388 DG |
836 | |
837 | error: | |
840cb59c | 838 | health_code_update(); |
edb67388 DG |
839 | return ret; |
840 | } | |
841 | ||
099e26bd | 842 | /* |
ffe60014 | 843 | * Create the specified channel onto the UST tracer for a UST session. |
4f3ab6ee | 844 | * |
ffe60014 | 845 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 846 | */ |
ffe60014 DG |
847 | static int create_ust_channel(struct ust_app *app, |
848 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
849 | struct consumer_output *consumer) | |
4f3ab6ee DG |
850 | { |
851 | int ret; | |
ffe60014 DG |
852 | unsigned int nb_fd = 0; |
853 | struct consumer_socket *socket; | |
854 | struct ust_app_stream *stream, *stmp; | |
4f3ab6ee DG |
855 | |
856 | assert(app); | |
ffe60014 | 857 | assert(ua_sess); |
4f3ab6ee | 858 | assert(ua_chan); |
ffe60014 | 859 | assert(consumer); |
4f3ab6ee | 860 | |
840cb59c | 861 | health_code_update(); |
4f3ab6ee | 862 | |
ffe60014 DG |
863 | /* Get the right consumer socket for the application. */ |
864 | socket = find_consumer_socket_by_bitness(app->bits_per_long, consumer); | |
865 | if (!socket) { | |
4f3ab6ee DG |
866 | ret = -1; |
867 | goto error; | |
868 | } | |
869 | ||
ffe60014 DG |
870 | health_code_update(); |
871 | ||
7f133705 | 872 | /* |
ffe60014 DG |
873 | * Ask consumer to create channel. The consumer will return the number of |
874 | * stream we have to expect. | |
7f133705 | 875 | */ |
ffe60014 | 876 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, consumer, socket); |
7f133705 | 877 | if (ret < 0) { |
7f133705 DG |
878 | goto error; |
879 | } | |
880 | ||
ffe60014 DG |
881 | /* |
882 | * Compute the number of fd needed before receiving them. It must be 2 per | |
883 | * stream. | |
884 | */ | |
885 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
886 | ||
887 | /* Reserve the amount of file descriptor we need. */ | |
888 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
4f3ab6ee | 889 | if (ret < 0) { |
ffe60014 DG |
890 | ERR("Exhausted number of available FD upon create channel"); |
891 | goto error_fd_get; | |
4f3ab6ee DG |
892 | } |
893 | ||
840cb59c | 894 | health_code_update(); |
4f3ab6ee | 895 | |
ffe60014 DG |
896 | /* |
897 | * Now get the channel from the consumer. This call wil populate the stream | |
898 | * list of that channel and set the ust object. | |
899 | */ | |
900 | ret = ust_consumer_get_channel(socket, ua_chan); | |
4063050c | 901 | if (ret < 0) { |
ffe60014 | 902 | goto error_destroy; |
4063050c | 903 | } |
86acf0da | 904 | |
ffe60014 DG |
905 | /* Send channel to the application. */ |
906 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
5b4a0ec0 | 907 | if (ret < 0) { |
b551a063 DG |
908 | goto error; |
909 | } | |
910 | ||
ffe60014 DG |
911 | /* Send all streams to application. */ |
912 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
913 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
914 | if (ret < 0) { | |
915 | goto error; | |
916 | } | |
917 | /* We don't need the stream anymore once sent to the tracer. */ | |
918 | cds_list_del(&stream->list); | |
919 | delete_ust_app_stream(-1, stream); | |
920 | } | |
b551a063 | 921 | |
ffe60014 DG |
922 | /* Flag the channel that it is sent to the application. */ |
923 | ua_chan->is_sent = 1; | |
b551a063 | 924 | |
840cb59c | 925 | health_code_update(); |
86acf0da | 926 | |
8535a6d9 DG |
927 | /* If channel is not enabled, disable it on the tracer */ |
928 | if (!ua_chan->enabled) { | |
929 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
930 | if (ret < 0) { | |
931 | goto error; | |
932 | } | |
933 | } | |
934 | ||
ffe60014 DG |
935 | return 0; |
936 | ||
937 | error_destroy: | |
938 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
939 | error_fd_get: | |
940 | /* | |
941 | * Initiate a destroy channel on the consumer since we had an error | |
942 | * handling it on our side. The return value is of no importance since we | |
943 | * already have a ret value set by the previous error that we need to | |
944 | * return. | |
945 | */ | |
946 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
b551a063 | 947 | error: |
840cb59c | 948 | health_code_update(); |
b551a063 DG |
949 | return ret; |
950 | } | |
951 | ||
91d76f53 | 952 | /* |
5b4a0ec0 | 953 | * Create the specified event onto the UST tracer for a UST session. |
91d76f53 | 954 | */ |
edb67388 DG |
955 | static |
956 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
957 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 958 | { |
5b4a0ec0 | 959 | int ret = 0; |
284d8f55 | 960 | |
840cb59c | 961 | health_code_update(); |
86acf0da | 962 | |
5b4a0ec0 | 963 | /* Create UST event on tracer */ |
852d0037 | 964 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 DG |
965 | &ua_event->obj); |
966 | if (ret < 0) { | |
ffe60014 DG |
967 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
968 | ERR("Error ustctl create event %s for app pid: %d with ret %d", | |
969 | ua_event->attr.name, app->pid, ret); | |
970 | } else { | |
971 | DBG3("UST app create event failed. Application is dead."); | |
972 | } | |
5b4a0ec0 | 973 | goto error; |
91d76f53 | 974 | } |
f6a9efaa | 975 | |
5b4a0ec0 | 976 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 977 | |
5b4a0ec0 | 978 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 979 | ua_event->attr.name, app->pid); |
f6a9efaa | 980 | |
840cb59c | 981 | health_code_update(); |
86acf0da | 982 | |
025faf73 DG |
983 | /* Set filter if one is present. */ |
984 | if (ua_event->filter) { | |
985 | ret = set_ust_event_filter(ua_event, app); | |
986 | if (ret < 0) { | |
987 | goto error; | |
988 | } | |
989 | } | |
990 | ||
8535a6d9 | 991 | /* If event not enabled, disable it on the tracer */ |
fc34caaa | 992 | if (ua_event->enabled == 0) { |
8535a6d9 DG |
993 | ret = disable_ust_event(app, ua_sess, ua_event); |
994 | if (ret < 0) { | |
fc34caaa DG |
995 | /* |
996 | * If we hit an EPERM, something is wrong with our disable call. If | |
997 | * we get an EEXIST, there is a problem on the tracer side since we | |
998 | * just created it. | |
999 | */ | |
1000 | switch (ret) { | |
49c336c1 | 1001 | case -LTTNG_UST_ERR_PERM: |
fc34caaa DG |
1002 | /* Code flow problem */ |
1003 | assert(0); | |
49c336c1 | 1004 | case -LTTNG_UST_ERR_EXIST: |
fc34caaa DG |
1005 | /* It's OK for our use case. */ |
1006 | ret = 0; | |
1007 | break; | |
1008 | default: | |
1009 | break; | |
1010 | } | |
8535a6d9 DG |
1011 | goto error; |
1012 | } | |
1013 | } | |
1014 | ||
5b4a0ec0 | 1015 | error: |
840cb59c | 1016 | health_code_update(); |
5b4a0ec0 | 1017 | return ret; |
91d76f53 | 1018 | } |
48842b30 | 1019 | |
5b4a0ec0 DG |
1020 | /* |
1021 | * Copy data between an UST app event and a LTT event. | |
1022 | */ | |
421cb601 | 1023 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1024 | struct ltt_ust_event *uevent) |
1025 | { | |
1026 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); | |
1027 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1028 | ||
fc34caaa DG |
1029 | ua_event->enabled = uevent->enabled; |
1030 | ||
5b4a0ec0 DG |
1031 | /* Copy event attributes */ |
1032 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1033 | ||
53a80697 MD |
1034 | /* Copy filter bytecode */ |
1035 | if (uevent->filter) { | |
025faf73 DG |
1036 | ua_event->filter = alloc_copy_ust_app_filter(uevent->filter); |
1037 | /* Filter might be NULL here in case of ENONEM. */ | |
53a80697 | 1038 | } |
48842b30 DG |
1039 | } |
1040 | ||
5b4a0ec0 DG |
1041 | /* |
1042 | * Copy data between an UST app channel and a LTT channel. | |
1043 | */ | |
421cb601 | 1044 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1045 | struct ltt_ust_channel *uchan) |
1046 | { | |
bec39940 | 1047 | struct lttng_ht_iter iter; |
48842b30 | 1048 | struct ltt_ust_event *uevent; |
55cc08a6 | 1049 | struct ltt_ust_context *uctx; |
48842b30 | 1050 | struct ust_app_event *ua_event; |
55cc08a6 | 1051 | struct ust_app_ctx *ua_ctx; |
48842b30 | 1052 | |
fc34caaa | 1053 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1054 | |
1055 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1056 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 DG |
1057 | |
1058 | /* Copy event attributes since the layout is different. */ | |
1059 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1060 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1061 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1062 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1063 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
1064 | ua_chan->attr.output = uchan->attr.output; | |
1065 | /* | |
1066 | * Note that the attribute channel type is not set since the channel on the | |
1067 | * tracing registry side does not have this information. | |
1068 | */ | |
48842b30 | 1069 | |
fc34caaa DG |
1070 | ua_chan->enabled = uchan->enabled; |
1071 | ||
bec39940 | 1072 | cds_lfht_for_each_entry(uchan->ctx->ht, &iter.iter, uctx, node.node) { |
55cc08a6 DG |
1073 | ua_ctx = alloc_ust_app_ctx(&uctx->ctx); |
1074 | if (ua_ctx == NULL) { | |
1075 | continue; | |
1076 | } | |
bec39940 DG |
1077 | lttng_ht_node_init_ulong(&ua_ctx->node, |
1078 | (unsigned long) ua_ctx->ctx.ctx); | |
1079 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
55cc08a6 | 1080 | } |
48842b30 | 1081 | |
421cb601 | 1082 | /* Copy all events from ltt ust channel to ust app channel */ |
bec39940 | 1083 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
18eace3b DG |
1084 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
1085 | uevent->filter, uevent->attr.loglevel); | |
1086 | if (ua_event == NULL) { | |
421cb601 | 1087 | DBG2("UST event %s not found on shadow copy channel", |
48842b30 | 1088 | uevent->attr.name); |
284d8f55 | 1089 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
48842b30 | 1090 | if (ua_event == NULL) { |
5b4a0ec0 | 1091 | continue; |
48842b30 | 1092 | } |
421cb601 | 1093 | shadow_copy_event(ua_event, uevent); |
18eace3b | 1094 | add_unique_ust_app_event(ua_chan->events, ua_event); |
48842b30 | 1095 | } |
48842b30 DG |
1096 | } |
1097 | ||
fc34caaa | 1098 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1099 | } |
1100 | ||
5b4a0ec0 DG |
1101 | /* |
1102 | * Copy data between a UST app session and a regular LTT session. | |
1103 | */ | |
421cb601 | 1104 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1105 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1106 | { |
bec39940 DG |
1107 | struct lttng_ht_node_str *ua_chan_node; |
1108 | struct lttng_ht_iter iter; | |
48842b30 DG |
1109 | struct ltt_ust_channel *uchan; |
1110 | struct ust_app_channel *ua_chan; | |
477d7741 MD |
1111 | time_t rawtime; |
1112 | struct tm *timeinfo; | |
1113 | char datetime[16]; | |
1114 | int ret; | |
1115 | ||
1116 | /* Get date and time for unique app path */ | |
1117 | time(&rawtime); | |
1118 | timeinfo = localtime(&rawtime); | |
1119 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1120 | |
421cb601 | 1121 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1122 | |
a991f516 | 1123 | ua_sess->id = usess->id; |
6df2e2c9 MD |
1124 | ua_sess->uid = usess->uid; |
1125 | ua_sess->gid = usess->gid; | |
48842b30 | 1126 | |
00e2e675 DG |
1127 | ret = snprintf(ua_sess->path, PATH_MAX, "%s-%d-%s/", app->name, app->pid, |
1128 | datetime); | |
477d7741 MD |
1129 | if (ret < 0) { |
1130 | PERROR("asprintf UST shadow copy session"); | |
1131 | /* TODO: We cannot return an error from here.. */ | |
1132 | assert(0); | |
1133 | } | |
1134 | ||
48842b30 DG |
1135 | /* TODO: support all UST domain */ |
1136 | ||
1137 | /* Iterate over all channels in global domain. */ | |
bec39940 DG |
1138 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, |
1139 | uchan, node.node) { | |
1140 | struct lttng_ht_iter uiter; | |
ba767faf | 1141 | |
bec39940 DG |
1142 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
1143 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
5b4a0ec0 | 1144 | if (ua_chan_node != NULL) { |
fc34caaa | 1145 | /* Session exist. Contiuing. */ |
5b4a0ec0 DG |
1146 | continue; |
1147 | } | |
421cb601 | 1148 | |
5b4a0ec0 DG |
1149 | DBG2("Channel %s not found on shadow session copy, creating it", |
1150 | uchan->name); | |
1151 | ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr); | |
1152 | if (ua_chan == NULL) { | |
fc34caaa | 1153 | /* malloc failed FIXME: Might want to do handle ENOMEM .. */ |
5b4a0ec0 | 1154 | continue; |
48842b30 | 1155 | } |
5b4a0ec0 | 1156 | shadow_copy_channel(ua_chan, uchan); |
ffe60014 DG |
1157 | /* |
1158 | * The concept of metadata channel does not exist on the tracing | |
1159 | * registry side of the session daemon so this can only be a per CPU | |
1160 | * channel and not metadata. | |
1161 | */ | |
1162 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
1163 | ||
bec39940 | 1164 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); |
48842b30 DG |
1165 | } |
1166 | } | |
1167 | ||
78f0bacd DG |
1168 | /* |
1169 | * Lookup sesison wrapper. | |
1170 | */ | |
84cd17c6 MD |
1171 | static |
1172 | void __lookup_session_by_app(struct ltt_ust_session *usess, | |
bec39940 | 1173 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1174 | { |
1175 | /* Get right UST app session from app */ | |
2c348c10 | 1176 | lttng_ht_lookup(app->sessions, (void *)((unsigned long) usess->id), iter); |
84cd17c6 MD |
1177 | } |
1178 | ||
421cb601 DG |
1179 | /* |
1180 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1181 | * id. |
421cb601 | 1182 | */ |
48842b30 DG |
1183 | static struct ust_app_session *lookup_session_by_app( |
1184 | struct ltt_ust_session *usess, struct ust_app *app) | |
1185 | { | |
bec39940 DG |
1186 | struct lttng_ht_iter iter; |
1187 | struct lttng_ht_node_ulong *node; | |
48842b30 | 1188 | |
84cd17c6 | 1189 | __lookup_session_by_app(usess, app, &iter); |
bec39940 | 1190 | node = lttng_ht_iter_get_node_ulong(&iter); |
48842b30 DG |
1191 | if (node == NULL) { |
1192 | goto error; | |
1193 | } | |
1194 | ||
1195 | return caa_container_of(node, struct ust_app_session, node); | |
1196 | ||
1197 | error: | |
1198 | return NULL; | |
1199 | } | |
1200 | ||
421cb601 | 1201 | /* |
3d8ca23b | 1202 | * Create a session on the tracer side for the given app. |
421cb601 | 1203 | * |
3d8ca23b DG |
1204 | * On success, ua_sess_ptr is populated with the session pointer or else left |
1205 | * untouched. If the session was created, is_created is set to 1. On error, | |
1206 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
1207 | * be NULL. | |
1208 | * | |
1209 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
1210 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 1211 | */ |
3d8ca23b DG |
1212 | static int create_ust_app_session(struct ltt_ust_session *usess, |
1213 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, | |
1214 | int *is_created) | |
421cb601 | 1215 | { |
3d8ca23b | 1216 | int ret, created = 0; |
421cb601 DG |
1217 | struct ust_app_session *ua_sess; |
1218 | ||
3d8ca23b DG |
1219 | assert(usess); |
1220 | assert(app); | |
1221 | assert(ua_sess_ptr); | |
1222 | ||
840cb59c | 1223 | health_code_update(); |
86acf0da | 1224 | |
421cb601 DG |
1225 | ua_sess = lookup_session_by_app(usess, app); |
1226 | if (ua_sess == NULL) { | |
a991f516 | 1227 | DBG2("UST app pid: %d session id %d not found, creating it", |
852d0037 | 1228 | app->pid, usess->id); |
421cb601 DG |
1229 | ua_sess = alloc_ust_app_session(); |
1230 | if (ua_sess == NULL) { | |
1231 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
1232 | ret = -ENOMEM; |
1233 | goto error; | |
421cb601 | 1234 | } |
477d7741 | 1235 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 1236 | created = 1; |
421cb601 DG |
1237 | } |
1238 | ||
840cb59c | 1239 | health_code_update(); |
86acf0da | 1240 | |
421cb601 | 1241 | if (ua_sess->handle == -1) { |
852d0037 | 1242 | ret = ustctl_create_session(app->sock); |
421cb601 | 1243 | if (ret < 0) { |
ffe60014 DG |
1244 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1245 | ERR("Creating session for app pid %d with ret %d", | |
1246 | app->pid, ret); | |
1247 | } else { | |
1248 | DBG("UST app creating session failed. Application is dead"); | |
1249 | } | |
0f83395d | 1250 | delete_ust_app_session(-1, ua_sess); |
3d8ca23b DG |
1251 | if (ret != -ENOMEM) { |
1252 | /* | |
1253 | * Tracer is probably gone or got an internal error so let's | |
1254 | * behave like it will soon unregister or not usable. | |
1255 | */ | |
1256 | ret = -ENOTCONN; | |
1257 | } | |
1258 | goto error; | |
421cb601 DG |
1259 | } |
1260 | ||
421cb601 DG |
1261 | ua_sess->handle = ret; |
1262 | ||
1263 | /* Add ust app session to app's HT */ | |
2c348c10 | 1264 | lttng_ht_node_init_ulong(&ua_sess->node, (unsigned long) ua_sess->id); |
bec39940 | 1265 | lttng_ht_add_unique_ulong(app->sessions, &ua_sess->node); |
421cb601 DG |
1266 | |
1267 | DBG2("UST app session created successfully with handle %d", ret); | |
1268 | } | |
1269 | ||
3d8ca23b DG |
1270 | *ua_sess_ptr = ua_sess; |
1271 | if (is_created) { | |
1272 | *is_created = created; | |
1273 | } | |
1274 | /* Everything went well. */ | |
1275 | ret = 0; | |
1276 | ||
1277 | error: | |
840cb59c | 1278 | health_code_update(); |
3d8ca23b | 1279 | return ret; |
421cb601 DG |
1280 | } |
1281 | ||
55cc08a6 DG |
1282 | /* |
1283 | * Create a context for the channel on the tracer. | |
1284 | */ | |
1285 | static | |
1286 | int create_ust_app_channel_context(struct ust_app_session *ua_sess, | |
1287 | struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx, | |
1288 | struct ust_app *app) | |
1289 | { | |
1290 | int ret = 0; | |
bec39940 DG |
1291 | struct lttng_ht_iter iter; |
1292 | struct lttng_ht_node_ulong *node; | |
55cc08a6 DG |
1293 | struct ust_app_ctx *ua_ctx; |
1294 | ||
1295 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
1296 | ||
bec39940 DG |
1297 | lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter); |
1298 | node = lttng_ht_iter_get_node_ulong(&iter); | |
55cc08a6 DG |
1299 | if (node != NULL) { |
1300 | ret = -EEXIST; | |
1301 | goto error; | |
1302 | } | |
1303 | ||
1304 | ua_ctx = alloc_ust_app_ctx(uctx); | |
1305 | if (ua_ctx == NULL) { | |
1306 | /* malloc failed */ | |
1307 | ret = -1; | |
1308 | goto error; | |
1309 | } | |
1310 | ||
bec39940 DG |
1311 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); |
1312 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
55cc08a6 DG |
1313 | |
1314 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
1315 | if (ret < 0) { | |
1316 | goto error; | |
1317 | } | |
1318 | ||
1319 | error: | |
1320 | return ret; | |
1321 | } | |
1322 | ||
edb67388 DG |
1323 | /* |
1324 | * Enable on the tracer side a ust app event for the session and channel. | |
1325 | */ | |
1326 | static | |
1327 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
35a9059d | 1328 | struct ust_app_event *ua_event, struct ust_app *app) |
edb67388 DG |
1329 | { |
1330 | int ret; | |
1331 | ||
1332 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1333 | if (ret < 0) { | |
1334 | goto error; | |
1335 | } | |
1336 | ||
1337 | ua_event->enabled = 1; | |
1338 | ||
1339 | error: | |
1340 | return ret; | |
1341 | } | |
1342 | ||
9730260e DG |
1343 | /* |
1344 | * Disable on the tracer side a ust app event for the session and channel. | |
1345 | */ | |
1346 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
7f79d3a1 | 1347 | struct ust_app_event *ua_event, struct ust_app *app) |
9730260e DG |
1348 | { |
1349 | int ret; | |
1350 | ||
1351 | ret = disable_ust_event(app, ua_sess, ua_event); | |
1352 | if (ret < 0) { | |
1353 | goto error; | |
1354 | } | |
1355 | ||
1356 | ua_event->enabled = 0; | |
1357 | ||
1358 | error: | |
1359 | return ret; | |
1360 | } | |
1361 | ||
78f0bacd DG |
1362 | /* |
1363 | * Lookup ust app channel for session and disable it on the tracer side. | |
1364 | */ | |
8535a6d9 DG |
1365 | static |
1366 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
1367 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
78f0bacd | 1368 | { |
8535a6d9 | 1369 | int ret; |
78f0bacd DG |
1370 | |
1371 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
1372 | if (ret < 0) { | |
1373 | goto error; | |
1374 | } | |
1375 | ||
8535a6d9 DG |
1376 | ua_chan->enabled = 0; |
1377 | ||
78f0bacd DG |
1378 | error: |
1379 | return ret; | |
1380 | } | |
1381 | ||
1382 | /* | |
1383 | * Lookup ust app channel for session and enable it on the tracer side. | |
1384 | */ | |
1385 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
1386 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
1387 | { | |
1388 | int ret = 0; | |
bec39940 DG |
1389 | struct lttng_ht_iter iter; |
1390 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
1391 | struct ust_app_channel *ua_chan; |
1392 | ||
bec39940 DG |
1393 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
1394 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
78f0bacd | 1395 | if (ua_chan_node == NULL) { |
a991f516 MD |
1396 | DBG2("Unable to find channel %s in ust session id %u", |
1397 | uchan->name, ua_sess->id); | |
78f0bacd DG |
1398 | goto error; |
1399 | } | |
1400 | ||
1401 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
1402 | ||
1403 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
1404 | if (ret < 0) { | |
1405 | goto error; | |
1406 | } | |
1407 | ||
1408 | error: | |
1409 | return ret; | |
1410 | } | |
1411 | ||
284d8f55 | 1412 | /* |
4d710ac2 DG |
1413 | * Create UST app channel and create it on the tracer. Set ua_chanp of the |
1414 | * newly created channel if not NULL. | |
284d8f55 | 1415 | */ |
4d710ac2 DG |
1416 | static int create_ust_app_channel(struct ust_app_session *ua_sess, |
1417 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
ffe60014 | 1418 | struct consumer_output *consumer, enum lttng_ust_chan_type type, |
4d710ac2 | 1419 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
1420 | { |
1421 | int ret = 0; | |
bec39940 DG |
1422 | struct lttng_ht_iter iter; |
1423 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
1424 | struct ust_app_channel *ua_chan; |
1425 | ||
1426 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
1427 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
1428 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 1429 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 1430 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 1431 | goto end; |
5b4a0ec0 DG |
1432 | } |
1433 | ||
fc34caaa DG |
1434 | ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr); |
1435 | if (ua_chan == NULL) { | |
1436 | /* Only malloc can fail here */ | |
4d710ac2 | 1437 | ret = -ENOMEM; |
fc34caaa DG |
1438 | goto error; |
1439 | } | |
1440 | shadow_copy_channel(ua_chan, uchan); | |
1441 | ||
ffe60014 DG |
1442 | /* Set channel type. */ |
1443 | ua_chan->attr.type = type; | |
1444 | ||
1445 | ret = create_ust_channel(app, ua_sess, ua_chan, consumer); | |
5b4a0ec0 DG |
1446 | if (ret < 0) { |
1447 | goto error; | |
1448 | } | |
1449 | ||
4d710ac2 | 1450 | /* Only add the channel if successful on the tracer side. */ |
58f3ca76 DG |
1451 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); |
1452 | ||
fc34caaa | 1453 | DBG2("UST app create channel %s for PID %d completed", ua_chan->name, |
852d0037 | 1454 | app->pid); |
fc34caaa DG |
1455 | |
1456 | end: | |
4d710ac2 DG |
1457 | if (ua_chanp) { |
1458 | *ua_chanp = ua_chan; | |
1459 | } | |
1460 | ||
1461 | /* Everything went well. */ | |
1462 | return 0; | |
5b4a0ec0 DG |
1463 | |
1464 | error: | |
ffe60014 | 1465 | delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan); |
4d710ac2 | 1466 | return ret; |
5b4a0ec0 DG |
1467 | } |
1468 | ||
1469 | /* | |
1470 | * Create UST app event and create it on the tracer side. | |
1471 | */ | |
edb67388 DG |
1472 | static |
1473 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
1474 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
1475 | struct ust_app *app) | |
284d8f55 | 1476 | { |
edb67388 | 1477 | int ret = 0; |
5b4a0ec0 | 1478 | struct ust_app_event *ua_event; |
284d8f55 | 1479 | |
5b4a0ec0 | 1480 | /* Get event node */ |
18eace3b DG |
1481 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
1482 | uevent->filter, uevent->attr.loglevel); | |
1483 | if (ua_event != NULL) { | |
fc34caaa | 1484 | ret = -EEXIST; |
edb67388 DG |
1485 | goto end; |
1486 | } | |
5b4a0ec0 | 1487 | |
edb67388 DG |
1488 | /* Does not exist so create one */ |
1489 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); | |
1490 | if (ua_event == NULL) { | |
1491 | /* Only malloc can failed so something is really wrong */ | |
1492 | ret = -ENOMEM; | |
fc34caaa | 1493 | goto end; |
5b4a0ec0 | 1494 | } |
edb67388 | 1495 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 1496 | |
edb67388 | 1497 | /* Create it on the tracer side */ |
5b4a0ec0 | 1498 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 1499 | if (ret < 0) { |
fc34caaa | 1500 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 1501 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
1502 | goto error; |
1503 | } | |
1504 | ||
18eace3b | 1505 | add_unique_ust_app_event(ua_chan->events, ua_event); |
284d8f55 | 1506 | |
fc34caaa | 1507 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 1508 | app->pid); |
7f79d3a1 | 1509 | |
edb67388 | 1510 | end: |
fc34caaa DG |
1511 | return ret; |
1512 | ||
5b4a0ec0 | 1513 | error: |
fc34caaa DG |
1514 | /* Valid. Calling here is already in a read side lock */ |
1515 | delete_ust_app_event(-1, ua_event); | |
edb67388 | 1516 | return ret; |
5b4a0ec0 DG |
1517 | } |
1518 | ||
1519 | /* | |
1520 | * Create UST metadata and open it on the tracer side. | |
1521 | */ | |
1522 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
ffe60014 | 1523 | struct ust_app *app, struct consumer_output *consumer) |
5b4a0ec0 DG |
1524 | { |
1525 | int ret = 0; | |
ffe60014 | 1526 | struct ust_app_channel *metadata; |
5b4a0ec0 | 1527 | |
ffe60014 DG |
1528 | assert(ua_sess); |
1529 | assert(app); | |
5b4a0ec0 | 1530 | |
ffe60014 DG |
1531 | if (ua_sess->metadata) { |
1532 | /* Already exist. Return success. */ | |
1533 | goto end; | |
5b4a0ec0 DG |
1534 | } |
1535 | ||
ffe60014 DG |
1536 | /* Allocate UST metadata */ |
1537 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, NULL); | |
1538 | if (!metadata) { | |
1539 | /* malloc() failed */ | |
1540 | ret = -ENOMEM; | |
1541 | goto error; | |
1542 | } | |
5b4a0ec0 | 1543 | |
ffe60014 DG |
1544 | /* Set default attributes for metadata. */ |
1545 | metadata->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
1546 | metadata->attr.subbuf_size = default_get_metadata_subbuf_size(); | |
1547 | metadata->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM; | |
1548 | metadata->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER; | |
1549 | metadata->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER; | |
1550 | metadata->attr.output = LTTNG_UST_MMAP; | |
1551 | metadata->attr.type = LTTNG_UST_CHAN_METADATA; | |
5b4a0ec0 | 1552 | |
ffe60014 DG |
1553 | ret = create_ust_channel(app, ua_sess, metadata, consumer); |
1554 | if (ret < 0) { | |
1555 | goto error_create; | |
5b4a0ec0 DG |
1556 | } |
1557 | ||
ffe60014 DG |
1558 | ua_sess->metadata = metadata; |
1559 | ||
1560 | DBG2("UST metadata opened for app pid %d", app->pid); | |
5b4a0ec0 | 1561 | |
ffe60014 DG |
1562 | end: |
1563 | return 0; | |
1564 | error_create: | |
1565 | delete_ust_app_channel(metadata->is_sent ? app->sock : -1, metadata); | |
5b4a0ec0 | 1566 | error: |
ffe60014 | 1567 | return ret; |
5b4a0ec0 DG |
1568 | } |
1569 | ||
1570 | /* | |
1571 | * Return pointer to traceable apps list. | |
1572 | */ | |
bec39940 | 1573 | struct lttng_ht *ust_app_get_ht(void) |
5b4a0ec0 DG |
1574 | { |
1575 | return ust_app_ht; | |
1576 | } | |
1577 | ||
1578 | /* | |
1579 | * Return ust app pointer or NULL if not found. | |
1580 | */ | |
1581 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
1582 | { | |
bec39940 DG |
1583 | struct lttng_ht_node_ulong *node; |
1584 | struct lttng_ht_iter iter; | |
5b4a0ec0 DG |
1585 | |
1586 | rcu_read_lock(); | |
bec39940 DG |
1587 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
1588 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
1589 | if (node == NULL) { |
1590 | DBG2("UST app no found with pid %d", pid); | |
1591 | goto error; | |
1592 | } | |
1593 | rcu_read_unlock(); | |
1594 | ||
1595 | DBG2("Found UST app by pid %d", pid); | |
1596 | ||
852d0037 | 1597 | return caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
1598 | |
1599 | error: | |
1600 | rcu_read_unlock(); | |
1601 | return NULL; | |
1602 | } | |
1603 | ||
1604 | /* | |
1605 | * Using pid and uid (of the app), allocate a new ust_app struct and | |
1606 | * add it to the global traceable app list. | |
1607 | * | |
0df502fd MD |
1608 | * On success, return 0, else return malloc -ENOMEM, or -EINVAL if app |
1609 | * bitness is not supported. | |
5b4a0ec0 DG |
1610 | */ |
1611 | int ust_app_register(struct ust_register_msg *msg, int sock) | |
1612 | { | |
1613 | struct ust_app *lta; | |
799e2c4f | 1614 | int ret; |
5b4a0ec0 | 1615 | |
173af62f DG |
1616 | if ((msg->bits_per_long == 64 && |
1617 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
1618 | || (msg->bits_per_long == 32 && | |
1619 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 1620 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
7753dea8 MD |
1621 | "%d-bit long, but no consumerd for this long size is available.\n", |
1622 | msg->name, msg->pid, msg->bits_per_long); | |
799e2c4f MD |
1623 | ret = close(sock); |
1624 | if (ret) { | |
1625 | PERROR("close"); | |
1626 | } | |
4063050c | 1627 | lttng_fd_put(LTTNG_FD_APPS, 1); |
0df502fd MD |
1628 | return -EINVAL; |
1629 | } | |
3f2c5fcc MD |
1630 | if (msg->major != LTTNG_UST_COMM_MAJOR) { |
1631 | ERR("Registration failed: application \"%s\" (pid: %d) has " | |
1632 | "communication protocol version %u.%u, but sessiond supports 2.x.\n", | |
1633 | msg->name, msg->pid, msg->major, msg->minor); | |
799e2c4f MD |
1634 | ret = close(sock); |
1635 | if (ret) { | |
1636 | PERROR("close"); | |
1637 | } | |
4063050c | 1638 | lttng_fd_put(LTTNG_FD_APPS, 1); |
3f2c5fcc MD |
1639 | return -EINVAL; |
1640 | } | |
5b4a0ec0 DG |
1641 | lta = zmalloc(sizeof(struct ust_app)); |
1642 | if (lta == NULL) { | |
1643 | PERROR("malloc"); | |
1644 | return -ENOMEM; | |
1645 | } | |
1646 | ||
1647 | lta->ppid = msg->ppid; | |
1648 | lta->uid = msg->uid; | |
1649 | lta->gid = msg->gid; | |
e0c7ec2b | 1650 | lta->compatible = 0; /* Not compatible until proven */ |
7753dea8 | 1651 | lta->bits_per_long = msg->bits_per_long; |
5b4a0ec0 DG |
1652 | lta->v_major = msg->major; |
1653 | lta->v_minor = msg->minor; | |
1654 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
1655 | lta->name[16] = '\0'; | |
bec39940 | 1656 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
5b4a0ec0 | 1657 | |
852d0037 DG |
1658 | lta->pid = msg->pid; |
1659 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long)lta->pid); | |
1660 | lta->sock = sock; | |
1661 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long)lta->sock); | |
5b4a0ec0 | 1662 | |
d42f20df DG |
1663 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
1664 | ||
5b4a0ec0 | 1665 | rcu_read_lock(); |
852d0037 DG |
1666 | |
1667 | /* | |
1668 | * On a re-registration, we want to kick out the previous registration of | |
1669 | * that pid | |
1670 | */ | |
1671 | lttng_ht_add_replace_ulong(ust_app_ht, <a->pid_n); | |
1672 | ||
1673 | /* | |
1674 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
1675 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
1676 | * already in the table. | |
1677 | */ | |
1678 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, <a->sock_n); | |
1679 | ||
5b4a0ec0 DG |
1680 | rcu_read_unlock(); |
1681 | ||
1682 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s" | |
852d0037 DG |
1683 | " (version %d.%d)", lta->pid, lta->ppid, lta->uid, lta->gid, |
1684 | lta->sock, lta->name, lta->v_major, lta->v_minor); | |
5b4a0ec0 DG |
1685 | |
1686 | return 0; | |
1687 | } | |
1688 | ||
1689 | /* | |
1690 | * Unregister app by removing it from the global traceable app list and freeing | |
1691 | * the data struct. | |
1692 | * | |
1693 | * The socket is already closed at this point so no close to sock. | |
1694 | */ | |
1695 | void ust_app_unregister(int sock) | |
1696 | { | |
1697 | struct ust_app *lta; | |
bec39940 DG |
1698 | struct lttng_ht_node_ulong *node; |
1699 | struct lttng_ht_iter iter; | |
d42f20df | 1700 | struct ust_app_session *ua_sess; |
525b0740 | 1701 | int ret; |
5b4a0ec0 DG |
1702 | |
1703 | rcu_read_lock(); | |
886459c6 | 1704 | |
5b4a0ec0 | 1705 | /* Get the node reference for a call_rcu */ |
852d0037 | 1706 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 1707 | node = lttng_ht_iter_get_node_ulong(&iter); |
5b4a0ec0 | 1708 | if (node == NULL) { |
852d0037 | 1709 | ERR("Unable to find app by sock %d", sock); |
5b4a0ec0 DG |
1710 | goto error; |
1711 | } | |
284d8f55 | 1712 | |
852d0037 DG |
1713 | lta = caa_container_of(node, struct ust_app, sock_n); |
1714 | ||
1715 | DBG("PID %d unregistering with sock %d", lta->pid, sock); | |
1716 | ||
886459c6 | 1717 | /* Remove application from PID hash table */ |
852d0037 DG |
1718 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
1719 | assert(!ret); | |
1720 | ||
1721 | /* Assign second node for deletion */ | |
1722 | iter.iter.node = <a->pid_n.node; | |
1723 | ||
5b98a774 DG |
1724 | /* |
1725 | * Ignore return value since the node might have been removed before by an | |
1726 | * add replace during app registration because the PID can be reassigned by | |
1727 | * the OS. | |
1728 | */ | |
bec39940 | 1729 | ret = lttng_ht_del(ust_app_ht, &iter); |
5b98a774 DG |
1730 | if (ret) { |
1731 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
1732 | lta->pid); | |
1733 | } | |
852d0037 | 1734 | |
d42f20df DG |
1735 | /* Remove sessions so they are not visible during deletion.*/ |
1736 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, | |
1737 | node.node) { | |
1738 | ret = lttng_ht_del(lta->sessions, &iter); | |
1739 | if (ret) { | |
1740 | /* The session was already removed so scheduled for teardown. */ | |
1741 | continue; | |
1742 | } | |
1743 | ||
1744 | /* | |
1745 | * Add session to list for teardown. This is safe since at this point we | |
1746 | * are the only one using this list. | |
1747 | */ | |
1748 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); | |
1749 | } | |
1750 | ||
852d0037 DG |
1751 | /* Free memory */ |
1752 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
1753 | ||
284d8f55 | 1754 | error: |
5b4a0ec0 DG |
1755 | rcu_read_unlock(); |
1756 | return; | |
284d8f55 DG |
1757 | } |
1758 | ||
1759 | /* | |
5b4a0ec0 | 1760 | * Return traceable_app_count |
284d8f55 | 1761 | */ |
5b4a0ec0 | 1762 | unsigned long ust_app_list_count(void) |
284d8f55 | 1763 | { |
5b4a0ec0 | 1764 | unsigned long count; |
284d8f55 | 1765 | |
5b4a0ec0 | 1766 | rcu_read_lock(); |
bec39940 | 1767 | count = lttng_ht_get_count(ust_app_ht); |
5b4a0ec0 | 1768 | rcu_read_unlock(); |
284d8f55 | 1769 | |
5b4a0ec0 | 1770 | return count; |
284d8f55 DG |
1771 | } |
1772 | ||
5b4a0ec0 DG |
1773 | /* |
1774 | * Fill events array with all events name of all registered apps. | |
1775 | */ | |
1776 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 1777 | { |
5b4a0ec0 DG |
1778 | int ret, handle; |
1779 | size_t nbmem, count = 0; | |
bec39940 | 1780 | struct lttng_ht_iter iter; |
5b4a0ec0 | 1781 | struct ust_app *app; |
c617c0c6 | 1782 | struct lttng_event *tmp_event; |
421cb601 | 1783 | |
5b4a0ec0 | 1784 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
1785 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
1786 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
1787 | PERROR("zmalloc ust app events"); |
1788 | ret = -ENOMEM; | |
421cb601 DG |
1789 | goto error; |
1790 | } | |
1791 | ||
5b4a0ec0 | 1792 | rcu_read_lock(); |
421cb601 | 1793 | |
852d0037 | 1794 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 1795 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 1796 | |
840cb59c | 1797 | health_code_update(); |
86acf0da | 1798 | |
e0c7ec2b DG |
1799 | if (!app->compatible) { |
1800 | /* | |
1801 | * TODO: In time, we should notice the caller of this error by | |
1802 | * telling him that this is a version error. | |
1803 | */ | |
1804 | continue; | |
1805 | } | |
852d0037 | 1806 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 1807 | if (handle < 0) { |
ffe60014 DG |
1808 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
1809 | ERR("UST app list events getting handle failed for app pid %d", | |
1810 | app->pid); | |
1811 | } | |
5b4a0ec0 DG |
1812 | continue; |
1813 | } | |
421cb601 | 1814 | |
852d0037 | 1815 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 1816 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
1817 | /* Handle ustctl error. */ |
1818 | if (ret < 0) { | |
1819 | free(tmp_event); | |
1820 | if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) { | |
1821 | ERR("UST app tp list get failed for app %d with ret %d", | |
1822 | app->sock, ret); | |
1823 | } else { | |
1824 | DBG3("UST app tp list get failed. Application is dead"); | |
1825 | } | |
1826 | goto rcu_error; | |
1827 | } | |
1828 | ||
840cb59c | 1829 | health_code_update(); |
815564d8 | 1830 | if (count >= nbmem) { |
d7b3776f | 1831 | /* In case the realloc fails, we free the memory */ |
c617c0c6 MD |
1832 | void *ptr; |
1833 | ||
815564d8 MD |
1834 | DBG2("Reallocating event list from %zu to %zu entries", nbmem, |
1835 | 2 * nbmem); | |
1836 | nbmem *= 2; | |
c617c0c6 MD |
1837 | ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event)); |
1838 | if (ptr == NULL) { | |
5b4a0ec0 | 1839 | PERROR("realloc ust app events"); |
c617c0c6 | 1840 | free(tmp_event); |
5b4a0ec0 DG |
1841 | ret = -ENOMEM; |
1842 | goto rcu_error; | |
1843 | } | |
c617c0c6 | 1844 | tmp_event = ptr; |
5b4a0ec0 | 1845 | } |
c617c0c6 MD |
1846 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
1847 | tmp_event[count].loglevel = uiter.loglevel; | |
1848 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
1849 | tmp_event[count].pid = app->pid; | |
1850 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 1851 | count++; |
421cb601 | 1852 | } |
421cb601 DG |
1853 | } |
1854 | ||
5b4a0ec0 | 1855 | ret = count; |
c617c0c6 | 1856 | *events = tmp_event; |
421cb601 | 1857 | |
5b4a0ec0 | 1858 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 1859 | |
5b4a0ec0 DG |
1860 | rcu_error: |
1861 | rcu_read_unlock(); | |
421cb601 | 1862 | error: |
840cb59c | 1863 | health_code_update(); |
5b4a0ec0 | 1864 | return ret; |
421cb601 DG |
1865 | } |
1866 | ||
f37d259d MD |
1867 | /* |
1868 | * Fill events array with all events name of all registered apps. | |
1869 | */ | |
1870 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
1871 | { | |
1872 | int ret, handle; | |
1873 | size_t nbmem, count = 0; | |
1874 | struct lttng_ht_iter iter; | |
1875 | struct ust_app *app; | |
c617c0c6 | 1876 | struct lttng_event_field *tmp_event; |
f37d259d MD |
1877 | |
1878 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
1879 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
1880 | if (tmp_event == NULL) { | |
f37d259d MD |
1881 | PERROR("zmalloc ust app event fields"); |
1882 | ret = -ENOMEM; | |
1883 | goto error; | |
1884 | } | |
1885 | ||
1886 | rcu_read_lock(); | |
1887 | ||
1888 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
1889 | struct lttng_ust_field_iter uiter; | |
1890 | ||
840cb59c | 1891 | health_code_update(); |
86acf0da | 1892 | |
f37d259d MD |
1893 | if (!app->compatible) { |
1894 | /* | |
1895 | * TODO: In time, we should notice the caller of this error by | |
1896 | * telling him that this is a version error. | |
1897 | */ | |
1898 | continue; | |
1899 | } | |
1900 | handle = ustctl_tracepoint_field_list(app->sock); | |
1901 | if (handle < 0) { | |
ffe60014 DG |
1902 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
1903 | ERR("UST app list field getting handle failed for app pid %d", | |
1904 | app->pid); | |
1905 | } | |
f37d259d MD |
1906 | continue; |
1907 | } | |
1908 | ||
1909 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 1910 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
1911 | /* Handle ustctl error. */ |
1912 | if (ret < 0) { | |
1913 | free(tmp_event); | |
1914 | if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) { | |
1915 | ERR("UST app tp list field failed for app %d with ret %d", | |
1916 | app->sock, ret); | |
1917 | } else { | |
1918 | DBG3("UST app tp list field failed. Application is dead"); | |
1919 | } | |
1920 | goto rcu_error; | |
1921 | } | |
1922 | ||
840cb59c | 1923 | health_code_update(); |
f37d259d | 1924 | if (count >= nbmem) { |
d7b3776f | 1925 | /* In case the realloc fails, we free the memory */ |
c617c0c6 MD |
1926 | void *ptr; |
1927 | ||
f37d259d MD |
1928 | DBG2("Reallocating event field list from %zu to %zu entries", nbmem, |
1929 | 2 * nbmem); | |
1930 | nbmem *= 2; | |
c617c0c6 MD |
1931 | ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event_field)); |
1932 | if (ptr == NULL) { | |
f37d259d | 1933 | PERROR("realloc ust app event fields"); |
c617c0c6 | 1934 | free(tmp_event); |
f37d259d MD |
1935 | ret = -ENOMEM; |
1936 | goto rcu_error; | |
1937 | } | |
c617c0c6 | 1938 | tmp_event = ptr; |
f37d259d | 1939 | } |
f37d259d | 1940 | |
c617c0c6 MD |
1941 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
1942 | tmp_event[count].type = uiter.type; | |
1943 | tmp_event[count].nowrite = uiter.nowrite; | |
f37d259d | 1944 | |
c617c0c6 MD |
1945 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
1946 | tmp_event[count].event.loglevel = uiter.loglevel; | |
1947 | tmp_event[count].event.type = LTTNG_UST_TRACEPOINT; | |
1948 | tmp_event[count].event.pid = app->pid; | |
1949 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
1950 | count++; |
1951 | } | |
1952 | } | |
1953 | ||
1954 | ret = count; | |
c617c0c6 | 1955 | *fields = tmp_event; |
f37d259d MD |
1956 | |
1957 | DBG2("UST app list event fields done (%zu events)", count); | |
1958 | ||
1959 | rcu_error: | |
1960 | rcu_read_unlock(); | |
1961 | error: | |
840cb59c | 1962 | health_code_update(); |
f37d259d MD |
1963 | return ret; |
1964 | } | |
1965 | ||
5b4a0ec0 DG |
1966 | /* |
1967 | * Free and clean all traceable apps of the global list. | |
1968 | */ | |
1969 | void ust_app_clean_list(void) | |
421cb601 | 1970 | { |
5b4a0ec0 | 1971 | int ret; |
659ed79f | 1972 | struct ust_app *app; |
bec39940 | 1973 | struct lttng_ht_iter iter; |
421cb601 | 1974 | |
5b4a0ec0 | 1975 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 1976 | |
5b4a0ec0 | 1977 | rcu_read_lock(); |
421cb601 | 1978 | |
659ed79f | 1979 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 1980 | ret = lttng_ht_del(ust_app_ht, &iter); |
525b0740 | 1981 | assert(!ret); |
659ed79f | 1982 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); |
421cb601 DG |
1983 | } |
1984 | ||
852d0037 | 1985 | /* Cleanup socket hash table */ |
659ed79f DG |
1986 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, |
1987 | sock_n.node) { | |
852d0037 | 1988 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
bec39940 DG |
1989 | assert(!ret); |
1990 | } | |
852d0037 | 1991 | |
bec39940 | 1992 | /* Destroy is done only when the ht is empty */ |
852d0037 DG |
1993 | lttng_ht_destroy(ust_app_ht); |
1994 | lttng_ht_destroy(ust_app_ht_by_sock); | |
421cb601 | 1995 | |
5b4a0ec0 DG |
1996 | rcu_read_unlock(); |
1997 | } | |
1998 | ||
1999 | /* | |
2000 | * Init UST app hash table. | |
2001 | */ | |
2002 | void ust_app_ht_alloc(void) | |
2003 | { | |
bec39940 | 2004 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
852d0037 | 2005 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
421cb601 DG |
2006 | } |
2007 | ||
78f0bacd DG |
2008 | /* |
2009 | * For a specific UST session, disable the channel for all registered apps. | |
2010 | */ | |
35a9059d | 2011 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
2012 | struct ltt_ust_channel *uchan) |
2013 | { | |
2014 | int ret = 0; | |
bec39940 DG |
2015 | struct lttng_ht_iter iter; |
2016 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
2017 | struct ust_app *app; |
2018 | struct ust_app_session *ua_sess; | |
8535a6d9 | 2019 | struct ust_app_channel *ua_chan; |
78f0bacd DG |
2020 | |
2021 | if (usess == NULL || uchan == NULL) { | |
2022 | ERR("Disabling UST global channel with NULL values"); | |
2023 | ret = -1; | |
2024 | goto error; | |
2025 | } | |
2026 | ||
a991f516 MD |
2027 | DBG2("UST app disabling channel %s from global domain for session id %d", |
2028 | uchan->name, usess->id); | |
78f0bacd DG |
2029 | |
2030 | rcu_read_lock(); | |
2031 | ||
2032 | /* For every registered applications */ | |
852d0037 | 2033 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 2034 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
2035 | if (!app->compatible) { |
2036 | /* | |
2037 | * TODO: In time, we should notice the caller of this error by | |
2038 | * telling him that this is a version error. | |
2039 | */ | |
2040 | continue; | |
2041 | } | |
78f0bacd DG |
2042 | ua_sess = lookup_session_by_app(usess, app); |
2043 | if (ua_sess == NULL) { | |
2044 | continue; | |
2045 | } | |
2046 | ||
8535a6d9 | 2047 | /* Get channel */ |
bec39940 DG |
2048 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
2049 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
2050 | /* If the session if found for the app, the channel must be there */ |
2051 | assert(ua_chan_node); | |
2052 | ||
2053 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2054 | /* The channel must not be already disabled */ | |
2055 | assert(ua_chan->enabled == 1); | |
2056 | ||
2057 | /* Disable channel onto application */ | |
2058 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
2059 | if (ret < 0) { |
2060 | /* XXX: We might want to report this error at some point... */ | |
2061 | continue; | |
2062 | } | |
2063 | } | |
2064 | ||
2065 | rcu_read_unlock(); | |
2066 | ||
2067 | error: | |
2068 | return ret; | |
2069 | } | |
2070 | ||
2071 | /* | |
2072 | * For a specific UST session, enable the channel for all registered apps. | |
2073 | */ | |
35a9059d | 2074 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
2075 | struct ltt_ust_channel *uchan) |
2076 | { | |
2077 | int ret = 0; | |
bec39940 | 2078 | struct lttng_ht_iter iter; |
78f0bacd DG |
2079 | struct ust_app *app; |
2080 | struct ust_app_session *ua_sess; | |
2081 | ||
2082 | if (usess == NULL || uchan == NULL) { | |
2083 | ERR("Adding UST global channel to NULL values"); | |
2084 | ret = -1; | |
2085 | goto error; | |
2086 | } | |
2087 | ||
a991f516 MD |
2088 | DBG2("UST app enabling channel %s to global domain for session id %d", |
2089 | uchan->name, usess->id); | |
78f0bacd DG |
2090 | |
2091 | rcu_read_lock(); | |
2092 | ||
2093 | /* For every registered applications */ | |
852d0037 | 2094 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
2095 | if (!app->compatible) { |
2096 | /* | |
2097 | * TODO: In time, we should notice the caller of this error by | |
2098 | * telling him that this is a version error. | |
2099 | */ | |
2100 | continue; | |
2101 | } | |
78f0bacd DG |
2102 | ua_sess = lookup_session_by_app(usess, app); |
2103 | if (ua_sess == NULL) { | |
2104 | continue; | |
2105 | } | |
2106 | ||
2107 | /* Enable channel onto application */ | |
2108 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
2109 | if (ret < 0) { | |
2110 | /* XXX: We might want to report this error at some point... */ | |
2111 | continue; | |
2112 | } | |
2113 | } | |
2114 | ||
2115 | rcu_read_unlock(); | |
2116 | ||
2117 | error: | |
2118 | return ret; | |
2119 | } | |
2120 | ||
b0a40d28 DG |
2121 | /* |
2122 | * Disable an event in a channel and for a specific session. | |
2123 | */ | |
35a9059d DG |
2124 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
2125 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
2126 | { |
2127 | int ret = 0; | |
bec39940 DG |
2128 | struct lttng_ht_iter iter, uiter; |
2129 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
b0a40d28 DG |
2130 | struct ust_app *app; |
2131 | struct ust_app_session *ua_sess; | |
2132 | struct ust_app_channel *ua_chan; | |
2133 | struct ust_app_event *ua_event; | |
2134 | ||
2135 | DBG("UST app disabling event %s for all apps in channel " | |
a991f516 | 2136 | "%s for session id %d", uevent->attr.name, uchan->name, usess->id); |
b0a40d28 DG |
2137 | |
2138 | rcu_read_lock(); | |
2139 | ||
2140 | /* For all registered applications */ | |
852d0037 | 2141 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
2142 | if (!app->compatible) { |
2143 | /* | |
2144 | * TODO: In time, we should notice the caller of this error by | |
2145 | * telling him that this is a version error. | |
2146 | */ | |
2147 | continue; | |
2148 | } | |
b0a40d28 DG |
2149 | ua_sess = lookup_session_by_app(usess, app); |
2150 | if (ua_sess == NULL) { | |
2151 | /* Next app */ | |
2152 | continue; | |
2153 | } | |
2154 | ||
2155 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
2156 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
2157 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 2158 | if (ua_chan_node == NULL) { |
a991f516 | 2159 | DBG2("Channel %s not found in session id %d for app pid %d." |
852d0037 | 2160 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
2161 | continue; |
2162 | } | |
2163 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2164 | ||
bec39940 DG |
2165 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter); |
2166 | ua_event_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 DG |
2167 | if (ua_event_node == NULL) { |
2168 | DBG2("Event %s not found in channel %s for app pid %d." | |
852d0037 | 2169 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
2170 | continue; |
2171 | } | |
2172 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
2173 | ||
7f79d3a1 | 2174 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
2175 | if (ret < 0) { |
2176 | /* XXX: Report error someday... */ | |
2177 | continue; | |
2178 | } | |
2179 | } | |
2180 | ||
2181 | rcu_read_unlock(); | |
2182 | ||
2183 | return ret; | |
2184 | } | |
2185 | ||
9730260e | 2186 | /* |
edb67388 | 2187 | * For a specific UST session and UST channel, the event for all |
9730260e DG |
2188 | * registered apps. |
2189 | */ | |
35a9059d | 2190 | int ust_app_disable_all_event_glb(struct ltt_ust_session *usess, |
9730260e DG |
2191 | struct ltt_ust_channel *uchan) |
2192 | { | |
2193 | int ret = 0; | |
bec39940 DG |
2194 | struct lttng_ht_iter iter, uiter; |
2195 | struct lttng_ht_node_str *ua_chan_node; | |
9730260e DG |
2196 | struct ust_app *app; |
2197 | struct ust_app_session *ua_sess; | |
2198 | struct ust_app_channel *ua_chan; | |
2199 | struct ust_app_event *ua_event; | |
2200 | ||
2201 | DBG("UST app disabling all event for all apps in channel " | |
a991f516 | 2202 | "%s for session id %d", uchan->name, usess->id); |
9730260e DG |
2203 | |
2204 | rcu_read_lock(); | |
2205 | ||
2206 | /* For all registered applications */ | |
852d0037 | 2207 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
2208 | if (!app->compatible) { |
2209 | /* | |
2210 | * TODO: In time, we should notice the caller of this error by | |
2211 | * telling him that this is a version error. | |
2212 | */ | |
2213 | continue; | |
2214 | } | |
9730260e | 2215 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
2216 | if (!ua_sess) { |
2217 | /* The application has problem or is probably dead. */ | |
2218 | continue; | |
2219 | } | |
9730260e DG |
2220 | |
2221 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
2222 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
2223 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
2224 | /* If the channel is not found, there is a code flow error */ |
2225 | assert(ua_chan_node); | |
2226 | ||
9730260e DG |
2227 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
2228 | ||
2229 | /* Disable each events of channel */ | |
bec39940 DG |
2230 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
2231 | node.node) { | |
7f79d3a1 | 2232 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
9730260e DG |
2233 | if (ret < 0) { |
2234 | /* XXX: Report error someday... */ | |
2235 | continue; | |
2236 | } | |
2237 | } | |
2238 | } | |
2239 | ||
2240 | rcu_read_unlock(); | |
2241 | ||
2242 | return ret; | |
2243 | } | |
2244 | ||
421cb601 | 2245 | /* |
5b4a0ec0 | 2246 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 2247 | */ |
35a9059d | 2248 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
2249 | struct ltt_ust_channel *uchan) |
2250 | { | |
3d8ca23b | 2251 | int ret = 0, created; |
bec39940 | 2252 | struct lttng_ht_iter iter; |
48842b30 | 2253 | struct ust_app *app; |
3d8ca23b | 2254 | struct ust_app_session *ua_sess = NULL; |
48842b30 | 2255 | |
fc34caaa DG |
2256 | /* Very wrong code flow */ |
2257 | assert(usess); | |
2258 | assert(uchan); | |
421cb601 | 2259 | |
a991f516 MD |
2260 | DBG2("UST app adding channel %s to global domain for session id %d", |
2261 | uchan->name, usess->id); | |
48842b30 DG |
2262 | |
2263 | rcu_read_lock(); | |
421cb601 | 2264 | |
5b4a0ec0 | 2265 | /* For every registered applications */ |
852d0037 | 2266 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
2267 | if (!app->compatible) { |
2268 | /* | |
2269 | * TODO: In time, we should notice the caller of this error by | |
2270 | * telling him that this is a version error. | |
2271 | */ | |
2272 | continue; | |
2273 | } | |
edb67388 DG |
2274 | /* |
2275 | * Create session on the tracer side and add it to app session HT. Note | |
2276 | * that if session exist, it will simply return a pointer to the ust | |
2277 | * app session. | |
2278 | */ | |
3d8ca23b DG |
2279 | ret = create_ust_app_session(usess, app, &ua_sess, &created); |
2280 | if (ret < 0) { | |
2281 | switch (ret) { | |
2282 | case -ENOTCONN: | |
2283 | /* | |
2284 | * The application's socket is not valid. Either a bad socket | |
2285 | * or a timeout on it. We can't inform the caller that for a | |
2286 | * specific app, the session failed so lets continue here. | |
2287 | */ | |
2288 | continue; | |
2289 | case -ENOMEM: | |
2290 | default: | |
2291 | goto error_rcu_unlock; | |
2292 | } | |
48842b30 | 2293 | } |
3d8ca23b | 2294 | assert(ua_sess); |
48842b30 | 2295 | |
4d710ac2 | 2296 | /* Create channel onto application. We don't need the chan ref. */ |
ffe60014 DG |
2297 | ret = create_ust_app_channel(ua_sess, uchan, app, usess->consumer, |
2298 | LTTNG_UST_CHAN_PER_CPU, NULL); | |
3d8ca23b DG |
2299 | if (ret < 0) { |
2300 | if (ret == -ENOMEM) { | |
2301 | /* No more memory is a fatal error. Stop right now. */ | |
2302 | goto error_rcu_unlock; | |
2303 | } | |
2304 | /* Cleanup the created session if it's the case. */ | |
2305 | if (created) { | |
ffe60014 | 2306 | destroy_session(app, ua_sess); |
3d8ca23b | 2307 | } |
48842b30 | 2308 | } |
48842b30 | 2309 | } |
5b4a0ec0 | 2310 | |
95e047ff | 2311 | error_rcu_unlock: |
48842b30 | 2312 | rcu_read_unlock(); |
3c14c33f | 2313 | return ret; |
48842b30 DG |
2314 | } |
2315 | ||
5b4a0ec0 | 2316 | /* |
edb67388 | 2317 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 2318 | */ |
35a9059d | 2319 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
2320 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
2321 | { | |
2322 | int ret = 0; | |
bec39940 | 2323 | struct lttng_ht_iter iter, uiter; |
18eace3b | 2324 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
2325 | struct ust_app *app; |
2326 | struct ust_app_session *ua_sess; | |
2327 | struct ust_app_channel *ua_chan; | |
2328 | struct ust_app_event *ua_event; | |
48842b30 | 2329 | |
a991f516 MD |
2330 | DBG("UST app enabling event %s for all apps for session id %d", |
2331 | uevent->attr.name, usess->id); | |
48842b30 | 2332 | |
edb67388 DG |
2333 | /* |
2334 | * NOTE: At this point, this function is called only if the session and | |
2335 | * channel passed are already created for all apps. and enabled on the | |
2336 | * tracer also. | |
2337 | */ | |
2338 | ||
48842b30 | 2339 | rcu_read_lock(); |
421cb601 DG |
2340 | |
2341 | /* For all registered applications */ | |
852d0037 | 2342 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
2343 | if (!app->compatible) { |
2344 | /* | |
2345 | * TODO: In time, we should notice the caller of this error by | |
2346 | * telling him that this is a version error. | |
2347 | */ | |
2348 | continue; | |
2349 | } | |
edb67388 | 2350 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
2351 | if (!ua_sess) { |
2352 | /* The application has problem or is probably dead. */ | |
2353 | continue; | |
2354 | } | |
ba767faf | 2355 | |
edb67388 | 2356 | /* Lookup channel in the ust app session */ |
bec39940 DG |
2357 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
2358 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
2359 | /* If the channel is not found, there is a code flow error */ |
2360 | assert(ua_chan_node); | |
2361 | ||
2362 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2363 | ||
18eace3b DG |
2364 | /* Get event node */ |
2365 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
2366 | uevent->filter, uevent->attr.loglevel); | |
2367 | if (ua_event == NULL) { | |
7f79d3a1 | 2368 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 2369 | "Skipping app", uevent->attr.name, app->pid); |
35a9059d DG |
2370 | continue; |
2371 | } | |
35a9059d DG |
2372 | |
2373 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
2374 | if (ret < 0) { | |
7f79d3a1 | 2375 | goto error; |
48842b30 | 2376 | } |
edb67388 DG |
2377 | } |
2378 | ||
7f79d3a1 | 2379 | error: |
edb67388 | 2380 | rcu_read_unlock(); |
edb67388 DG |
2381 | return ret; |
2382 | } | |
2383 | ||
2384 | /* | |
2385 | * For a specific existing UST session and UST channel, creates the event for | |
2386 | * all registered apps. | |
2387 | */ | |
35a9059d | 2388 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
2389 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
2390 | { | |
2391 | int ret = 0; | |
bec39940 DG |
2392 | struct lttng_ht_iter iter, uiter; |
2393 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
2394 | struct ust_app *app; |
2395 | struct ust_app_session *ua_sess; | |
2396 | struct ust_app_channel *ua_chan; | |
2397 | ||
a991f516 MD |
2398 | DBG("UST app creating event %s for all apps for session id %d", |
2399 | uevent->attr.name, usess->id); | |
edb67388 | 2400 | |
edb67388 DG |
2401 | rcu_read_lock(); |
2402 | ||
2403 | /* For all registered applications */ | |
852d0037 | 2404 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
2405 | if (!app->compatible) { |
2406 | /* | |
2407 | * TODO: In time, we should notice the caller of this error by | |
2408 | * telling him that this is a version error. | |
2409 | */ | |
2410 | continue; | |
2411 | } | |
edb67388 | 2412 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
2413 | if (!ua_sess) { |
2414 | /* The application has problem or is probably dead. */ | |
2415 | continue; | |
2416 | } | |
48842b30 DG |
2417 | |
2418 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
2419 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
2420 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
2421 | /* If the channel is not found, there is a code flow error */ |
2422 | assert(ua_chan_node); | |
2423 | ||
48842b30 DG |
2424 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
2425 | ||
edb67388 DG |
2426 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
2427 | if (ret < 0) { | |
49c336c1 | 2428 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
2429 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
2430 | break; | |
2431 | } | |
2432 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 2433 | uevent->attr.name, app->pid); |
5b4a0ec0 | 2434 | continue; |
48842b30 | 2435 | } |
48842b30 | 2436 | } |
5b4a0ec0 | 2437 | |
48842b30 DG |
2438 | rcu_read_unlock(); |
2439 | ||
2440 | return ret; | |
2441 | } | |
2442 | ||
5b4a0ec0 DG |
2443 | /* |
2444 | * Start tracing for a specific UST session and app. | |
2445 | */ | |
421cb601 | 2446 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
2447 | { |
2448 | int ret = 0; | |
48842b30 | 2449 | struct ust_app_session *ua_sess; |
48842b30 | 2450 | |
852d0037 | 2451 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 2452 | |
509cbaf8 MD |
2453 | rcu_read_lock(); |
2454 | ||
e0c7ec2b DG |
2455 | if (!app->compatible) { |
2456 | goto end; | |
2457 | } | |
2458 | ||
421cb601 DG |
2459 | ua_sess = lookup_session_by_app(usess, app); |
2460 | if (ua_sess == NULL) { | |
d42f20df DG |
2461 | /* The session is in teardown process. Ignore and continue. */ |
2462 | goto end; | |
421cb601 | 2463 | } |
48842b30 | 2464 | |
aea829b3 DG |
2465 | /* Upon restart, we skip the setup, already done */ |
2466 | if (ua_sess->started) { | |
8be98f9a | 2467 | goto skip_setup; |
aea829b3 | 2468 | } |
8be98f9a | 2469 | |
a4b92340 DG |
2470 | /* Create directories if consumer is LOCAL and has a path defined. */ |
2471 | if (usess->consumer->type == CONSUMER_DST_LOCAL && | |
2472 | strlen(usess->consumer->dst.trace_path) > 0) { | |
2473 | ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path, | |
2474 | S_IRWXU | S_IRWXG, usess->uid, usess->gid); | |
2475 | if (ret < 0) { | |
2476 | if (ret != -EEXIST) { | |
2477 | ERR("Trace directory creation error"); | |
509cbaf8 | 2478 | goto error_rcu_unlock; |
421cb601 | 2479 | } |
173af62f | 2480 | } |
7753dea8 | 2481 | } |
aea829b3 | 2482 | |
ffe60014 DG |
2483 | /* Create the metadata for the application. */ |
2484 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer); | |
421cb601 | 2485 | if (ret < 0) { |
509cbaf8 | 2486 | goto error_rcu_unlock; |
421cb601 | 2487 | } |
48842b30 | 2488 | |
840cb59c | 2489 | health_code_update(); |
86acf0da | 2490 | |
8be98f9a | 2491 | skip_setup: |
421cb601 | 2492 | /* This start the UST tracing */ |
852d0037 | 2493 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
421cb601 | 2494 | if (ret < 0) { |
ffe60014 DG |
2495 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
2496 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
2497 | app->pid, ret); | |
2498 | } else { | |
2499 | DBG("UST app start session failed. Application is dead."); | |
2500 | } | |
509cbaf8 | 2501 | goto error_rcu_unlock; |
421cb601 | 2502 | } |
5b4a0ec0 | 2503 | |
55c3953d DG |
2504 | /* Indicate that the session has been started once */ |
2505 | ua_sess->started = 1; | |
2506 | ||
840cb59c | 2507 | health_code_update(); |
86acf0da | 2508 | |
421cb601 | 2509 | /* Quiescent wait after starting trace */ |
ffe60014 DG |
2510 | ret = ustctl_wait_quiescent(app->sock); |
2511 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
2512 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
2513 | app->pid, ret); | |
2514 | } | |
48842b30 | 2515 | |
e0c7ec2b DG |
2516 | end: |
2517 | rcu_read_unlock(); | |
840cb59c | 2518 | health_code_update(); |
421cb601 | 2519 | return 0; |
48842b30 | 2520 | |
509cbaf8 MD |
2521 | error_rcu_unlock: |
2522 | rcu_read_unlock(); | |
840cb59c | 2523 | health_code_update(); |
421cb601 DG |
2524 | return -1; |
2525 | } | |
48842b30 | 2526 | |
8be98f9a MD |
2527 | /* |
2528 | * Stop tracing for a specific UST session and app. | |
2529 | */ | |
2530 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) | |
2531 | { | |
2532 | int ret = 0; | |
bec39940 | 2533 | struct lttng_ht_iter iter; |
8be98f9a | 2534 | struct ust_app_session *ua_sess; |
6d3686da | 2535 | struct ust_app_channel *ua_chan; |
8be98f9a | 2536 | |
852d0037 | 2537 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
2538 | |
2539 | rcu_read_lock(); | |
2540 | ||
e0c7ec2b DG |
2541 | if (!app->compatible) { |
2542 | goto end; | |
2543 | } | |
2544 | ||
8be98f9a MD |
2545 | ua_sess = lookup_session_by_app(usess, app); |
2546 | if (ua_sess == NULL) { | |
d42f20df | 2547 | goto end; |
8be98f9a MD |
2548 | } |
2549 | ||
9bc07046 DG |
2550 | /* |
2551 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
2552 | * that was never started. It's possible since we can have a fail start |
2553 | * from either the application manager thread or the command thread. Simply | |
2554 | * indicate that this is a stop error. | |
9bc07046 | 2555 | */ |
f9dfc3d9 | 2556 | if (!ua_sess->started) { |
c45536e1 DG |
2557 | goto error_rcu_unlock; |
2558 | } | |
7db205b5 | 2559 | |
840cb59c | 2560 | health_code_update(); |
86acf0da | 2561 | |
9d6c7d3f | 2562 | /* This inhibits UST tracing */ |
852d0037 | 2563 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
9d6c7d3f | 2564 | if (ret < 0) { |
ffe60014 DG |
2565 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
2566 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
2567 | app->pid, ret); | |
2568 | } else { | |
2569 | DBG("UST app stop session failed. Application is dead."); | |
2570 | } | |
9d6c7d3f DG |
2571 | goto error_rcu_unlock; |
2572 | } | |
2573 | ||
840cb59c | 2574 | health_code_update(); |
86acf0da | 2575 | |
9d6c7d3f | 2576 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
2577 | ret = ustctl_wait_quiescent(app->sock); |
2578 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
2579 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
2580 | app->pid, ret); | |
2581 | } | |
9d6c7d3f | 2582 | |
840cb59c | 2583 | health_code_update(); |
86acf0da | 2584 | |
9d6c7d3f | 2585 | /* Flushing buffers */ |
bec39940 DG |
2586 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
2587 | node.node) { | |
840cb59c | 2588 | health_code_update(); |
ffe60014 | 2589 | assert(ua_chan->is_sent); |
852d0037 | 2590 | ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj); |
8be98f9a | 2591 | if (ret < 0) { |
ffe60014 DG |
2592 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
2593 | ERR("UST app PID %d channel %s flush failed with ret %d", | |
2594 | app->pid, ua_chan->name, ret); | |
2595 | } else { | |
2596 | DBG3("UST app failed to flush %s. Application is dead.", | |
2597 | ua_chan->name); | |
2598 | /* No need to continue. */ | |
2599 | goto end; | |
2600 | } | |
6d3686da DG |
2601 | /* Continuing flushing all buffers */ |
2602 | continue; | |
8be98f9a MD |
2603 | } |
2604 | } | |
8be98f9a | 2605 | |
840cb59c | 2606 | health_code_update(); |
86acf0da | 2607 | |
ffe60014 | 2608 | assert(ua_sess->metadata->is_sent); |
90d97d10 | 2609 | /* Flush all buffers before stopping */ |
852d0037 | 2610 | ret = ustctl_sock_flush_buffer(app->sock, ua_sess->metadata->obj); |
90d97d10 | 2611 | if (ret < 0) { |
ffe60014 DG |
2612 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
2613 | ERR("UST app PID %d metadata flush failed with ret %d", app->pid, | |
2614 | ret); | |
2615 | goto error_rcu_unlock; | |
2616 | } else { | |
2617 | DBG3("UST app failed to flush metadata. Application is dead."); | |
2618 | } | |
90d97d10 DG |
2619 | } |
2620 | ||
7db205b5 DG |
2621 | end: |
2622 | rcu_read_unlock(); | |
840cb59c | 2623 | health_code_update(); |
8be98f9a MD |
2624 | return 0; |
2625 | ||
2626 | error_rcu_unlock: | |
2627 | rcu_read_unlock(); | |
840cb59c | 2628 | health_code_update(); |
8be98f9a MD |
2629 | return -1; |
2630 | } | |
2631 | ||
84cd17c6 MD |
2632 | /* |
2633 | * Destroy a specific UST session in apps. | |
2634 | */ | |
3353de95 | 2635 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 2636 | { |
ffe60014 | 2637 | int ret; |
84cd17c6 | 2638 | struct ust_app_session *ua_sess; |
bec39940 DG |
2639 | struct lttng_ht_iter iter; |
2640 | struct lttng_ht_node_ulong *node; | |
84cd17c6 | 2641 | |
852d0037 | 2642 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
2643 | |
2644 | rcu_read_lock(); | |
2645 | ||
e0c7ec2b DG |
2646 | if (!app->compatible) { |
2647 | goto end; | |
2648 | } | |
2649 | ||
84cd17c6 | 2650 | __lookup_session_by_app(usess, app, &iter); |
bec39940 | 2651 | node = lttng_ht_iter_get_node_ulong(&iter); |
84cd17c6 | 2652 | if (node == NULL) { |
d42f20df DG |
2653 | /* Session is being or is deleted. */ |
2654 | goto end; | |
84cd17c6 MD |
2655 | } |
2656 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 2657 | |
840cb59c | 2658 | health_code_update(); |
ffe60014 | 2659 | destroy_session(app, ua_sess); |
84cd17c6 | 2660 | |
840cb59c | 2661 | health_code_update(); |
7db205b5 | 2662 | |
84cd17c6 | 2663 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
2664 | ret = ustctl_wait_quiescent(app->sock); |
2665 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
2666 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
2667 | app->pid, ret); | |
2668 | } | |
84cd17c6 | 2669 | |
e0c7ec2b DG |
2670 | end: |
2671 | rcu_read_unlock(); | |
840cb59c | 2672 | health_code_update(); |
84cd17c6 | 2673 | return 0; |
84cd17c6 MD |
2674 | } |
2675 | ||
5b4a0ec0 DG |
2676 | /* |
2677 | * Start tracing for the UST session. | |
2678 | */ | |
421cb601 DG |
2679 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
2680 | { | |
2681 | int ret = 0; | |
bec39940 | 2682 | struct lttng_ht_iter iter; |
421cb601 | 2683 | struct ust_app *app; |
48842b30 | 2684 | |
421cb601 DG |
2685 | DBG("Starting all UST traces"); |
2686 | ||
2687 | rcu_read_lock(); | |
421cb601 | 2688 | |
852d0037 | 2689 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
421cb601 | 2690 | ret = ust_app_start_trace(usess, app); |
48842b30 | 2691 | if (ret < 0) { |
5b4a0ec0 DG |
2692 | /* Continue to next apps even on error */ |
2693 | continue; | |
48842b30 | 2694 | } |
48842b30 | 2695 | } |
5b4a0ec0 | 2696 | |
48842b30 DG |
2697 | rcu_read_unlock(); |
2698 | ||
2699 | return 0; | |
2700 | } | |
487cf67c | 2701 | |
8be98f9a MD |
2702 | /* |
2703 | * Start tracing for the UST session. | |
2704 | */ | |
2705 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
2706 | { | |
2707 | int ret = 0; | |
bec39940 | 2708 | struct lttng_ht_iter iter; |
8be98f9a MD |
2709 | struct ust_app *app; |
2710 | ||
2711 | DBG("Stopping all UST traces"); | |
2712 | ||
2713 | rcu_read_lock(); | |
2714 | ||
852d0037 | 2715 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
8be98f9a MD |
2716 | ret = ust_app_stop_trace(usess, app); |
2717 | if (ret < 0) { | |
2718 | /* Continue to next apps even on error */ | |
2719 | continue; | |
2720 | } | |
2721 | } | |
2722 | ||
2723 | rcu_read_unlock(); | |
2724 | ||
2725 | return 0; | |
2726 | } | |
2727 | ||
84cd17c6 MD |
2728 | /* |
2729 | * Destroy app UST session. | |
2730 | */ | |
2731 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
2732 | { | |
2733 | int ret = 0; | |
bec39940 | 2734 | struct lttng_ht_iter iter; |
84cd17c6 MD |
2735 | struct ust_app *app; |
2736 | ||
2737 | DBG("Destroy all UST traces"); | |
2738 | ||
2739 | rcu_read_lock(); | |
2740 | ||
852d0037 | 2741 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 2742 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
2743 | if (ret < 0) { |
2744 | /* Continue to next apps even on error */ | |
2745 | continue; | |
2746 | } | |
2747 | } | |
2748 | ||
2749 | rcu_read_unlock(); | |
2750 | ||
2751 | return 0; | |
2752 | } | |
2753 | ||
5b4a0ec0 DG |
2754 | /* |
2755 | * Add channels/events from UST global domain to registered apps at sock. | |
2756 | */ | |
487cf67c DG |
2757 | void ust_app_global_update(struct ltt_ust_session *usess, int sock) |
2758 | { | |
55c54cce | 2759 | int ret = 0; |
727d5404 | 2760 | struct lttng_ht_iter iter, uiter, iter_ctx; |
487cf67c | 2761 | struct ust_app *app; |
3d8ca23b | 2762 | struct ust_app_session *ua_sess = NULL; |
487cf67c DG |
2763 | struct ust_app_channel *ua_chan; |
2764 | struct ust_app_event *ua_event; | |
727d5404 | 2765 | struct ust_app_ctx *ua_ctx; |
1f3580c7 | 2766 | |
95e047ff | 2767 | assert(usess); |
ffe60014 | 2768 | assert(sock >= 0); |
1f3580c7 | 2769 | |
a991f516 MD |
2770 | DBG2("UST app global update for app sock %d for session id %d", sock, |
2771 | usess->id); | |
487cf67c | 2772 | |
284d8f55 DG |
2773 | rcu_read_lock(); |
2774 | ||
487cf67c DG |
2775 | app = find_app_by_sock(sock); |
2776 | if (app == NULL) { | |
ffe60014 | 2777 | ERR("Failed to find app sock %d", sock); |
487cf67c DG |
2778 | goto error; |
2779 | } | |
2780 | ||
e0c7ec2b DG |
2781 | if (!app->compatible) { |
2782 | goto error; | |
2783 | } | |
2784 | ||
3d8ca23b DG |
2785 | ret = create_ust_app_session(usess, app, &ua_sess, NULL); |
2786 | if (ret < 0) { | |
2787 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
2788 | goto error; |
2789 | } | |
3d8ca23b | 2790 | assert(ua_sess); |
487cf67c | 2791 | |
284d8f55 DG |
2792 | /* |
2793 | * We can iterate safely here over all UST app session sicne the create ust | |
2794 | * app session above made a shadow copy of the UST global domain from the | |
2795 | * ltt ust session. | |
2796 | */ | |
bec39940 DG |
2797 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
2798 | node.node) { | |
ffe60014 | 2799 | ret = create_ust_channel(app, ua_sess, ua_chan, usess->consumer); |
284d8f55 | 2800 | if (ret < 0) { |
ffe60014 DG |
2801 | /* |
2802 | * Stop everything. On error, the application failed, no more file | |
2803 | * descriptor are available or ENOMEM so stopping here is the only | |
2804 | * thing we can do for now. | |
2805 | */ | |
2806 | goto error; | |
487cf67c DG |
2807 | } |
2808 | ||
727d5404 DG |
2809 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter_ctx.iter, ua_ctx, |
2810 | node.node) { | |
2811 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
2812 | if (ret < 0) { | |
ffe60014 | 2813 | goto error; |
727d5404 DG |
2814 | } |
2815 | } | |
2816 | ||
2817 | ||
284d8f55 | 2818 | /* For each events */ |
bec39940 DG |
2819 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
2820 | node.node) { | |
284d8f55 DG |
2821 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
2822 | if (ret < 0) { | |
ffe60014 | 2823 | goto error; |
487cf67c | 2824 | } |
36dc12cc | 2825 | } |
487cf67c DG |
2826 | } |
2827 | ||
36dc12cc | 2828 | if (usess->start_trace) { |
421cb601 | 2829 | ret = ust_app_start_trace(usess, app); |
36dc12cc | 2830 | if (ret < 0) { |
36dc12cc DG |
2831 | goto error; |
2832 | } | |
2833 | ||
852d0037 | 2834 | DBG2("UST trace started for app pid %d", app->pid); |
36dc12cc DG |
2835 | } |
2836 | ||
ffe60014 DG |
2837 | /* Everything went well at this point. */ |
2838 | rcu_read_unlock(); | |
2839 | return; | |
2840 | ||
487cf67c | 2841 | error: |
ffe60014 DG |
2842 | if (ua_sess) { |
2843 | destroy_session(app, ua_sess); | |
2844 | } | |
487cf67c DG |
2845 | rcu_read_unlock(); |
2846 | return; | |
2847 | } | |
55cc08a6 DG |
2848 | |
2849 | /* | |
2850 | * Add context to a specific channel for global UST domain. | |
2851 | */ | |
2852 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
2853 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
2854 | { | |
2855 | int ret = 0; | |
bec39940 DG |
2856 | struct lttng_ht_node_str *ua_chan_node; |
2857 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
2858 | struct ust_app_channel *ua_chan = NULL; |
2859 | struct ust_app_session *ua_sess; | |
2860 | struct ust_app *app; | |
2861 | ||
2862 | rcu_read_lock(); | |
2863 | ||
852d0037 | 2864 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
2865 | if (!app->compatible) { |
2866 | /* | |
2867 | * TODO: In time, we should notice the caller of this error by | |
2868 | * telling him that this is a version error. | |
2869 | */ | |
2870 | continue; | |
2871 | } | |
55cc08a6 DG |
2872 | ua_sess = lookup_session_by_app(usess, app); |
2873 | if (ua_sess == NULL) { | |
2874 | continue; | |
2875 | } | |
2876 | ||
2877 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
2878 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
2879 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 DG |
2880 | if (ua_chan_node == NULL) { |
2881 | continue; | |
2882 | } | |
2883 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
2884 | node); | |
2885 | ||
2886 | ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app); | |
2887 | if (ret < 0) { | |
2888 | continue; | |
2889 | } | |
2890 | } | |
2891 | ||
55cc08a6 DG |
2892 | rcu_read_unlock(); |
2893 | return ret; | |
2894 | } | |
2895 | ||
76d45b40 DG |
2896 | /* |
2897 | * Enable event for a channel from a UST session for a specific PID. | |
2898 | */ | |
2899 | int ust_app_enable_event_pid(struct ltt_ust_session *usess, | |
2900 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
2901 | { | |
2902 | int ret = 0; | |
bec39940 | 2903 | struct lttng_ht_iter iter; |
18eace3b | 2904 | struct lttng_ht_node_str *ua_chan_node; |
76d45b40 DG |
2905 | struct ust_app *app; |
2906 | struct ust_app_session *ua_sess; | |
2907 | struct ust_app_channel *ua_chan; | |
2908 | struct ust_app_event *ua_event; | |
2909 | ||
2910 | DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid); | |
2911 | ||
2912 | rcu_read_lock(); | |
2913 | ||
2914 | app = ust_app_find_by_pid(pid); | |
2915 | if (app == NULL) { | |
2916 | ERR("UST app enable event per PID %d not found", pid); | |
2917 | ret = -1; | |
2918 | goto error; | |
2919 | } | |
2920 | ||
e0c7ec2b DG |
2921 | if (!app->compatible) { |
2922 | ret = 0; | |
2923 | goto error; | |
2924 | } | |
2925 | ||
76d45b40 | 2926 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
2927 | if (!ua_sess) { |
2928 | /* The application has problem or is probably dead. */ | |
2929 | goto error; | |
2930 | } | |
76d45b40 DG |
2931 | |
2932 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
2933 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
2934 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
76d45b40 DG |
2935 | /* If the channel is not found, there is a code flow error */ |
2936 | assert(ua_chan_node); | |
2937 | ||
2938 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2939 | ||
18eace3b DG |
2940 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
2941 | uevent->filter, uevent->attr.loglevel); | |
2942 | if (ua_event == NULL) { | |
76d45b40 DG |
2943 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
2944 | if (ret < 0) { | |
2945 | goto error; | |
2946 | } | |
2947 | } else { | |
76d45b40 DG |
2948 | ret = enable_ust_app_event(ua_sess, ua_event, app); |
2949 | if (ret < 0) { | |
2950 | goto error; | |
2951 | } | |
2952 | } | |
2953 | ||
2954 | error: | |
2955 | rcu_read_unlock(); | |
2956 | return ret; | |
2957 | } | |
7f79d3a1 DG |
2958 | |
2959 | /* | |
2960 | * Disable event for a channel from a UST session for a specific PID. | |
2961 | */ | |
2962 | int ust_app_disable_event_pid(struct ltt_ust_session *usess, | |
2963 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
2964 | { | |
2965 | int ret = 0; | |
bec39940 DG |
2966 | struct lttng_ht_iter iter; |
2967 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
7f79d3a1 DG |
2968 | struct ust_app *app; |
2969 | struct ust_app_session *ua_sess; | |
2970 | struct ust_app_channel *ua_chan; | |
2971 | struct ust_app_event *ua_event; | |
2972 | ||
2973 | DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid); | |
2974 | ||
2975 | rcu_read_lock(); | |
2976 | ||
2977 | app = ust_app_find_by_pid(pid); | |
2978 | if (app == NULL) { | |
2979 | ERR("UST app disable event per PID %d not found", pid); | |
2980 | ret = -1; | |
2981 | goto error; | |
2982 | } | |
2983 | ||
e0c7ec2b DG |
2984 | if (!app->compatible) { |
2985 | ret = 0; | |
2986 | goto error; | |
2987 | } | |
2988 | ||
7f79d3a1 | 2989 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
2990 | if (!ua_sess) { |
2991 | /* The application has problem or is probably dead. */ | |
2992 | goto error; | |
2993 | } | |
7f79d3a1 DG |
2994 | |
2995 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
2996 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
2997 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
7f79d3a1 DG |
2998 | if (ua_chan_node == NULL) { |
2999 | /* Channel does not exist, skip disabling */ | |
3000 | goto error; | |
3001 | } | |
3002 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3003 | ||
bec39940 DG |
3004 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter); |
3005 | ua_event_node = lttng_ht_iter_get_node_str(&iter); | |
7f79d3a1 DG |
3006 | if (ua_event_node == NULL) { |
3007 | /* Event does not exist, skip disabling */ | |
3008 | goto error; | |
3009 | } | |
3010 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
3011 | ||
3012 | ret = disable_ust_app_event(ua_sess, ua_event, app); | |
3013 | if (ret < 0) { | |
3014 | goto error; | |
3015 | } | |
3016 | ||
3017 | error: | |
3018 | rcu_read_unlock(); | |
3019 | return ret; | |
3020 | } | |
e0c7ec2b DG |
3021 | |
3022 | /* | |
3023 | * Validate version of UST apps and set the compatible bit. | |
3024 | */ | |
3025 | int ust_app_validate_version(int sock) | |
3026 | { | |
3027 | int ret; | |
3028 | struct ust_app *app; | |
3029 | ||
3030 | rcu_read_lock(); | |
3031 | ||
3032 | app = find_app_by_sock(sock); | |
3033 | assert(app); | |
3034 | ||
840cb59c | 3035 | health_code_update(); |
86acf0da | 3036 | |
e0c7ec2b DG |
3037 | ret = ustctl_tracer_version(sock, &app->version); |
3038 | if (ret < 0) { | |
ffe60014 DG |
3039 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3040 | ERR("UST app tracer version failed for app pid %d", app->pid); | |
3041 | } | |
e0c7ec2b DG |
3042 | goto error; |
3043 | } | |
3044 | ||
3045 | /* Validate version */ | |
aee0cea0 | 3046 | if (app->version.major != UST_APP_MAJOR_VERSION) { |
e0c7ec2b DG |
3047 | goto error; |
3048 | } | |
3049 | ||
68264071 | 3050 | DBG2("UST app PID %d is compatible with internal major version %d " |
aee0cea0 | 3051 | "(supporting == %d)", app->pid, app->version.major, |
e0c7ec2b DG |
3052 | UST_APP_MAJOR_VERSION); |
3053 | app->compatible = 1; | |
3054 | rcu_read_unlock(); | |
840cb59c | 3055 | health_code_update(); |
e0c7ec2b DG |
3056 | return 0; |
3057 | ||
3058 | error: | |
68264071 | 3059 | DBG2("UST app PID %d is not compatible with internal major version %d " |
aee0cea0 | 3060 | "(supporting == %d)", app->pid, app->version.major, |
e0c7ec2b DG |
3061 | UST_APP_MAJOR_VERSION); |
3062 | app->compatible = 0; | |
3063 | rcu_read_unlock(); | |
840cb59c | 3064 | health_code_update(); |
e0c7ec2b DG |
3065 | return -1; |
3066 | } | |
4466912f DG |
3067 | |
3068 | /* | |
3069 | * Calibrate registered applications. | |
3070 | */ | |
3071 | int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate) | |
3072 | { | |
3073 | int ret = 0; | |
3074 | struct lttng_ht_iter iter; | |
3075 | struct ust_app *app; | |
3076 | ||
3077 | rcu_read_lock(); | |
3078 | ||
852d0037 | 3079 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4466912f DG |
3080 | if (!app->compatible) { |
3081 | /* | |
3082 | * TODO: In time, we should notice the caller of this error by | |
3083 | * telling him that this is a version error. | |
3084 | */ | |
3085 | continue; | |
3086 | } | |
3087 | ||
840cb59c | 3088 | health_code_update(); |
86acf0da | 3089 | |
852d0037 | 3090 | ret = ustctl_calibrate(app->sock, calibrate); |
4466912f DG |
3091 | if (ret < 0) { |
3092 | switch (ret) { | |
3093 | case -ENOSYS: | |
3094 | /* Means that it's not implemented on the tracer side. */ | |
3095 | ret = 0; | |
3096 | break; | |
3097 | default: | |
4466912f | 3098 | DBG2("Calibrate app PID %d returned with error %d", |
852d0037 | 3099 | app->pid, ret); |
4466912f DG |
3100 | break; |
3101 | } | |
3102 | } | |
3103 | } | |
3104 | ||
3105 | DBG("UST app global domain calibration finished"); | |
3106 | ||
3107 | rcu_read_unlock(); | |
3108 | ||
840cb59c | 3109 | health_code_update(); |
86acf0da | 3110 | |
4466912f DG |
3111 | return ret; |
3112 | } |