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