Commit | Line | Data |
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91d76f53 DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * | |
d14d33bf AM |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License, version 2 only, | |
6 | * as published by the Free Software Foundation. | |
91d76f53 DG |
7 | * |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
d14d33bf AM |
13 | * You should have received a copy of the GNU General Public License along |
14 | * with this program; if not, write to the Free Software Foundation, Inc., | |
15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
91d76f53 DG |
16 | */ |
17 | ||
18 | #define _GNU_SOURCE | |
19 | #include <errno.h> | |
7972aab2 | 20 | #include <inttypes.h> |
91d76f53 DG |
21 | #include <pthread.h> |
22 | #include <stdio.h> | |
23 | #include <stdlib.h> | |
099e26bd | 24 | #include <string.h> |
aba8e916 DG |
25 | #include <sys/stat.h> |
26 | #include <sys/types.h> | |
099e26bd | 27 | #include <unistd.h> |
0df502fd | 28 | #include <urcu/compiler.h> |
fb54cdbf | 29 | #include <lttng/ust-error.h> |
331744e3 | 30 | #include <signal.h> |
bec39940 | 31 | |
990570ed | 32 | #include <common/common.h> |
86acf0da | 33 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 34 | |
7972aab2 | 35 | #include "buffer-registry.h" |
86acf0da DG |
36 | #include "fd-limit.h" |
37 | #include "health.h" | |
56fff090 | 38 | #include "ust-app.h" |
48842b30 | 39 | #include "ust-consumer.h" |
d80a6244 | 40 | #include "ust-ctl.h" |
0b2dc8df | 41 | #include "utils.h" |
d80a6244 | 42 | |
d9bf3ca4 MD |
43 | /* Next available channel key. Access under next_channel_key_lock. */ |
44 | static uint64_t _next_channel_key; | |
45 | static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER; | |
46 | ||
47 | /* Next available session ID. Access under next_session_id_lock. */ | |
48 | static uint64_t _next_session_id; | |
49 | static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER; | |
ffe60014 DG |
50 | |
51 | /* | |
d9bf3ca4 | 52 | * Return the incremented value of next_channel_key. |
ffe60014 | 53 | */ |
d9bf3ca4 | 54 | static uint64_t get_next_channel_key(void) |
ffe60014 | 55 | { |
d9bf3ca4 MD |
56 | uint64_t ret; |
57 | ||
58 | pthread_mutex_lock(&next_channel_key_lock); | |
59 | ret = ++_next_channel_key; | |
60 | pthread_mutex_unlock(&next_channel_key_lock); | |
61 | return ret; | |
ffe60014 DG |
62 | } |
63 | ||
64 | /* | |
7972aab2 | 65 | * Return the atomically incremented value of next_session_id. |
ffe60014 | 66 | */ |
d9bf3ca4 | 67 | static uint64_t get_next_session_id(void) |
ffe60014 | 68 | { |
d9bf3ca4 MD |
69 | uint64_t ret; |
70 | ||
71 | pthread_mutex_lock(&next_session_id_lock); | |
72 | ret = ++_next_session_id; | |
73 | pthread_mutex_unlock(&next_session_id_lock); | |
74 | return ret; | |
ffe60014 DG |
75 | } |
76 | ||
d65d2de8 DG |
77 | static void copy_channel_attr_to_ustctl( |
78 | struct ustctl_consumer_channel_attr *attr, | |
79 | struct lttng_ust_channel_attr *uattr) | |
80 | { | |
81 | /* Copy event attributes since the layout is different. */ | |
82 | attr->subbuf_size = uattr->subbuf_size; | |
83 | attr->num_subbuf = uattr->num_subbuf; | |
84 | attr->overwrite = uattr->overwrite; | |
85 | attr->switch_timer_interval = uattr->switch_timer_interval; | |
86 | attr->read_timer_interval = uattr->read_timer_interval; | |
87 | attr->output = uattr->output; | |
88 | } | |
89 | ||
025faf73 DG |
90 | /* |
91 | * Match function for the hash table lookup. | |
92 | * | |
93 | * It matches an ust app event based on three attributes which are the event | |
94 | * name, the filter bytecode and the loglevel. | |
95 | */ | |
18eace3b DG |
96 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
97 | { | |
98 | struct ust_app_event *event; | |
99 | const struct ust_app_ht_key *key; | |
100 | ||
101 | assert(node); | |
102 | assert(_key); | |
103 | ||
104 | event = caa_container_of(node, struct ust_app_event, node.node); | |
105 | key = _key; | |
106 | ||
107 | /* Match the 3 elements of the key: name, filter and loglevel. */ | |
108 | ||
109 | /* Event name */ | |
110 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
111 | goto no_match; | |
112 | } | |
113 | ||
114 | /* Event loglevel. */ | |
115 | if (event->attr.loglevel != key->loglevel) { | |
025faf73 DG |
116 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
117 | && key->loglevel == 0 && event->attr.loglevel == -1) { | |
118 | /* | |
119 | * Match is accepted. This is because on event creation, the | |
120 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
121 | * -1 are accepted for this loglevel type since 0 is the one set by | |
122 | * the API when receiving an enable event. | |
123 | */ | |
124 | } else { | |
125 | goto no_match; | |
126 | } | |
18eace3b DG |
127 | } |
128 | ||
129 | /* One of the filters is NULL, fail. */ | |
130 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
131 | goto no_match; | |
132 | } | |
133 | ||
025faf73 DG |
134 | if (key->filter && event->filter) { |
135 | /* Both filters exists, check length followed by the bytecode. */ | |
136 | if (event->filter->len != key->filter->len || | |
137 | memcmp(event->filter->data, key->filter->data, | |
138 | event->filter->len) != 0) { | |
139 | goto no_match; | |
140 | } | |
18eace3b DG |
141 | } |
142 | ||
025faf73 | 143 | /* Match. */ |
18eace3b DG |
144 | return 1; |
145 | ||
146 | no_match: | |
147 | return 0; | |
18eace3b DG |
148 | } |
149 | ||
025faf73 DG |
150 | /* |
151 | * Unique add of an ust app event in the given ht. This uses the custom | |
152 | * ht_match_ust_app_event match function and the event name as hash. | |
153 | */ | |
d0b96690 | 154 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
155 | struct ust_app_event *event) |
156 | { | |
157 | struct cds_lfht_node *node_ptr; | |
158 | struct ust_app_ht_key key; | |
d0b96690 | 159 | struct lttng_ht *ht; |
18eace3b | 160 | |
d0b96690 DG |
161 | assert(ua_chan); |
162 | assert(ua_chan->events); | |
18eace3b DG |
163 | assert(event); |
164 | ||
d0b96690 | 165 | ht = ua_chan->events; |
18eace3b DG |
166 | key.name = event->attr.name; |
167 | key.filter = event->filter; | |
168 | key.loglevel = event->attr.loglevel; | |
169 | ||
170 | node_ptr = cds_lfht_add_unique(ht->ht, | |
171 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
172 | ht_match_ust_app_event, &key, &event->node.node); | |
173 | assert(node_ptr == &event->node.node); | |
174 | } | |
175 | ||
d88aee68 DG |
176 | /* |
177 | * Close the notify socket from the given RCU head object. This MUST be called | |
178 | * through a call_rcu(). | |
179 | */ | |
180 | static void close_notify_sock_rcu(struct rcu_head *head) | |
181 | { | |
182 | int ret; | |
183 | struct ust_app_notify_sock_obj *obj = | |
184 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
185 | ||
186 | /* Must have a valid fd here. */ | |
187 | assert(obj->fd >= 0); | |
188 | ||
189 | ret = close(obj->fd); | |
190 | if (ret) { | |
191 | ERR("close notify sock %d RCU", obj->fd); | |
192 | } | |
193 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
194 | ||
195 | free(obj); | |
196 | } | |
197 | ||
7972aab2 DG |
198 | /* |
199 | * Return the session registry according to the buffer type of the given | |
200 | * session. | |
201 | * | |
202 | * A registry per UID object MUST exists before calling this function or else | |
203 | * it assert() if not found. RCU read side lock must be acquired. | |
204 | */ | |
205 | static struct ust_registry_session *get_session_registry( | |
206 | struct ust_app_session *ua_sess) | |
207 | { | |
208 | struct ust_registry_session *registry = NULL; | |
209 | ||
210 | assert(ua_sess); | |
211 | ||
212 | switch (ua_sess->buffer_type) { | |
213 | case LTTNG_BUFFER_PER_PID: | |
214 | { | |
215 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
216 | if (!reg_pid) { | |
217 | goto error; | |
218 | } | |
219 | registry = reg_pid->registry->reg.ust; | |
220 | break; | |
221 | } | |
222 | case LTTNG_BUFFER_PER_UID: | |
223 | { | |
224 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
225 | ua_sess->tracing_id, ua_sess->bits_per_long, ua_sess->uid); | |
226 | if (!reg_uid) { | |
227 | goto error; | |
228 | } | |
229 | registry = reg_uid->registry->reg.ust; | |
230 | break; | |
231 | } | |
232 | default: | |
233 | assert(0); | |
234 | }; | |
235 | ||
236 | error: | |
237 | return registry; | |
238 | } | |
239 | ||
55cc08a6 DG |
240 | /* |
241 | * Delete ust context safely. RCU read lock must be held before calling | |
242 | * this function. | |
243 | */ | |
244 | static | |
245 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx) | |
246 | { | |
ffe60014 DG |
247 | int ret; |
248 | ||
249 | assert(ua_ctx); | |
250 | ||
55cc08a6 | 251 | if (ua_ctx->obj) { |
ffe60014 | 252 | ret = ustctl_release_object(sock, ua_ctx->obj); |
d0b96690 DG |
253 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
254 | ERR("UST app sock %d release ctx obj handle %d failed with ret %d", | |
255 | sock, ua_ctx->obj->handle, ret); | |
ffe60014 | 256 | } |
55cc08a6 DG |
257 | free(ua_ctx->obj); |
258 | } | |
259 | free(ua_ctx); | |
260 | } | |
261 | ||
d80a6244 DG |
262 | /* |
263 | * Delete ust app event safely. RCU read lock must be held before calling | |
264 | * this function. | |
265 | */ | |
8b366481 DG |
266 | static |
267 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event) | |
d80a6244 | 268 | { |
ffe60014 DG |
269 | int ret; |
270 | ||
271 | assert(ua_event); | |
272 | ||
53a80697 | 273 | free(ua_event->filter); |
d80a6244 | 274 | |
edb67388 | 275 | if (ua_event->obj != NULL) { |
ffe60014 DG |
276 | ret = ustctl_release_object(sock, ua_event->obj); |
277 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
278 | ERR("UST app sock %d release event obj failed with ret %d", | |
279 | sock, ret); | |
280 | } | |
edb67388 DG |
281 | free(ua_event->obj); |
282 | } | |
d80a6244 DG |
283 | free(ua_event); |
284 | } | |
285 | ||
286 | /* | |
7972aab2 DG |
287 | * Release ust data object of the given stream. |
288 | * | |
289 | * Return 0 on success or else a negative value. | |
d80a6244 | 290 | */ |
7972aab2 | 291 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream) |
d80a6244 | 292 | { |
7972aab2 | 293 | int ret = 0; |
ffe60014 DG |
294 | |
295 | assert(stream); | |
296 | ||
8b366481 | 297 | if (stream->obj) { |
ffe60014 DG |
298 | ret = ustctl_release_object(sock, stream->obj); |
299 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
300 | ERR("UST app sock %d release stream obj failed with ret %d", | |
301 | sock, ret); | |
302 | } | |
4063050c | 303 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
304 | free(stream->obj); |
305 | } | |
7972aab2 DG |
306 | |
307 | return ret; | |
308 | } | |
309 | ||
310 | /* | |
311 | * Delete ust app stream safely. RCU read lock must be held before calling | |
312 | * this function. | |
313 | */ | |
314 | static | |
315 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream) | |
316 | { | |
317 | assert(stream); | |
318 | ||
319 | (void) release_ust_app_stream(sock, stream); | |
84cd17c6 | 320 | free(stream); |
d80a6244 DG |
321 | } |
322 | ||
36b588ed MD |
323 | /* |
324 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
325 | * section and outside of call_rcu thread, so we postpone its execution |
326 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
327 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
328 | */ |
329 | static | |
330 | void delete_ust_app_channel_rcu(struct rcu_head *head) | |
331 | { | |
332 | struct ust_app_channel *ua_chan = | |
333 | caa_container_of(head, struct ust_app_channel, rcu_head); | |
334 | ||
0b2dc8df MD |
335 | ht_cleanup_push(ua_chan->ctx); |
336 | ht_cleanup_push(ua_chan->events); | |
36b588ed MD |
337 | free(ua_chan); |
338 | } | |
339 | ||
d80a6244 DG |
340 | /* |
341 | * Delete ust app channel safely. RCU read lock must be held before calling | |
342 | * this function. | |
343 | */ | |
8b366481 | 344 | static |
d0b96690 DG |
345 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
346 | struct ust_app *app) | |
d80a6244 DG |
347 | { |
348 | int ret; | |
bec39940 | 349 | struct lttng_ht_iter iter; |
d80a6244 | 350 | struct ust_app_event *ua_event; |
55cc08a6 | 351 | struct ust_app_ctx *ua_ctx; |
030a66fa | 352 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 353 | struct ust_registry_session *registry; |
d80a6244 | 354 | |
ffe60014 DG |
355 | assert(ua_chan); |
356 | ||
357 | DBG3("UST app deleting channel %s", ua_chan->name); | |
358 | ||
55cc08a6 | 359 | /* Wipe stream */ |
d80a6244 | 360 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 361 | cds_list_del(&stream->list); |
d80a6244 DG |
362 | delete_ust_app_stream(sock, stream); |
363 | } | |
364 | ||
55cc08a6 | 365 | /* Wipe context */ |
bec39940 | 366 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
31746f93 | 367 | cds_list_del(&ua_ctx->list); |
bec39940 | 368 | ret = lttng_ht_del(ua_chan->ctx, &iter); |
55cc08a6 DG |
369 | assert(!ret); |
370 | delete_ust_app_ctx(sock, ua_ctx); | |
371 | } | |
d80a6244 | 372 | |
55cc08a6 | 373 | /* Wipe events */ |
bec39940 DG |
374 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
375 | node.node) { | |
376 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 377 | assert(!ret); |
d80a6244 DG |
378 | delete_ust_app_event(sock, ua_event); |
379 | } | |
edb67388 | 380 | |
c8335706 MD |
381 | if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) { |
382 | /* Wipe and free registry from session registry. */ | |
383 | registry = get_session_registry(ua_chan->session); | |
384 | if (registry) { | |
385 | ust_registry_channel_del_free(registry, ua_chan->key); | |
386 | } | |
7972aab2 | 387 | } |
d0b96690 | 388 | |
edb67388 | 389 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
390 | /* Remove channel from application UST object descriptor. */ |
391 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
392 | lttng_ht_del(app->ust_objd, &iter); | |
ffe60014 DG |
393 | ret = ustctl_release_object(sock, ua_chan->obj); |
394 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
395 | ERR("UST app sock %d release channel obj failed with ret %d", | |
396 | sock, ret); | |
397 | } | |
7972aab2 | 398 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
399 | free(ua_chan->obj); |
400 | } | |
36b588ed | 401 | call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); |
d80a6244 DG |
402 | } |
403 | ||
331744e3 | 404 | /* |
1b532a60 DG |
405 | * Push metadata to consumer socket. |
406 | * | |
407 | * The socket lock MUST be acquired. | |
408 | * The ust app session lock MUST be acquired. | |
331744e3 JD |
409 | * |
410 | * On success, return the len of metadata pushed or else a negative value. | |
411 | */ | |
412 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
413 | struct consumer_socket *socket, int send_zero_data) | |
414 | { | |
415 | int ret; | |
416 | char *metadata_str = NULL; | |
417 | size_t len, offset; | |
418 | ssize_t ret_val; | |
419 | ||
420 | assert(registry); | |
421 | assert(socket); | |
1b532a60 DG |
422 | |
423 | /* | |
424 | * On a push metadata error either the consumer is dead or the metadata | |
425 | * channel has been destroyed because its endpoint might have died (e.g: | |
426 | * relayd). If so, the metadata closed flag is set to 1 so we deny pushing | |
427 | * metadata again which is not valid anymore on the consumer side. | |
428 | * | |
429 | * The ust app session mutex locked allows us to make this check without | |
430 | * the registry lock. | |
431 | */ | |
432 | if (registry->metadata_closed) { | |
433 | return -EPIPE; | |
434 | } | |
331744e3 JD |
435 | |
436 | pthread_mutex_lock(®istry->lock); | |
437 | ||
438 | offset = registry->metadata_len_sent; | |
439 | len = registry->metadata_len - registry->metadata_len_sent; | |
440 | if (len == 0) { | |
441 | DBG3("No metadata to push for metadata key %" PRIu64, | |
442 | registry->metadata_key); | |
443 | ret_val = len; | |
444 | if (send_zero_data) { | |
445 | DBG("No metadata to push"); | |
446 | goto push_data; | |
447 | } | |
448 | goto end; | |
449 | } | |
450 | ||
451 | /* Allocate only what we have to send. */ | |
452 | metadata_str = zmalloc(len); | |
453 | if (!metadata_str) { | |
454 | PERROR("zmalloc ust app metadata string"); | |
455 | ret_val = -ENOMEM; | |
456 | goto error; | |
457 | } | |
458 | /* Copy what we haven't send out. */ | |
459 | memcpy(metadata_str, registry->metadata + offset, len); | |
460 | registry->metadata_len_sent += len; | |
461 | ||
462 | push_data: | |
463 | pthread_mutex_unlock(®istry->lock); | |
464 | ret = consumer_push_metadata(socket, registry->metadata_key, | |
465 | metadata_str, len, offset); | |
466 | if (ret < 0) { | |
467 | ret_val = ret; | |
468 | goto error_push; | |
469 | } | |
470 | ||
471 | free(metadata_str); | |
472 | return len; | |
473 | ||
474 | end: | |
475 | error: | |
476 | pthread_mutex_unlock(®istry->lock); | |
477 | error_push: | |
478 | free(metadata_str); | |
479 | return ret_val; | |
480 | } | |
481 | ||
d88aee68 DG |
482 | /* |
483 | * For a given application and session, push metadata to consumer. The session | |
484 | * lock MUST be acquired here before calling this. | |
331744e3 JD |
485 | * Either sock or consumer is required : if sock is NULL, the default |
486 | * socket to send the metadata is retrieved from consumer, if sock | |
487 | * is not NULL we use it to send the metadata. | |
d88aee68 DG |
488 | * |
489 | * Return 0 on success else a negative error. | |
490 | */ | |
7972aab2 DG |
491 | static int push_metadata(struct ust_registry_session *registry, |
492 | struct consumer_output *consumer) | |
d88aee68 | 493 | { |
331744e3 JD |
494 | int ret_val; |
495 | ssize_t ret; | |
d88aee68 DG |
496 | struct consumer_socket *socket; |
497 | ||
7972aab2 DG |
498 | assert(registry); |
499 | assert(consumer); | |
500 | ||
501 | rcu_read_lock(); | |
d88aee68 | 502 | |
7972aab2 DG |
503 | /* |
504 | * Means that no metadata was assigned to the session. This can happens if | |
505 | * no start has been done previously. | |
506 | */ | |
507 | if (!registry->metadata_key) { | |
331744e3 | 508 | ret_val = 0; |
1b532a60 | 509 | goto end_rcu_unlock; |
d88aee68 DG |
510 | } |
511 | ||
d88aee68 | 512 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
513 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
514 | consumer); | |
d88aee68 | 515 | if (!socket) { |
331744e3 | 516 | ret_val = -1; |
d88aee68 DG |
517 | goto error_rcu_unlock; |
518 | } | |
519 | ||
520 | /* | |
521 | * TODO: Currently, we hold the socket lock around sampling of the next | |
522 | * metadata segment to ensure we send metadata over the consumer socket in | |
523 | * the correct order. This makes the registry lock nest inside the socket | |
524 | * lock. | |
525 | * | |
526 | * Please note that this is a temporary measure: we should move this lock | |
527 | * back into ust_consumer_push_metadata() when the consumer gets the | |
528 | * ability to reorder the metadata it receives. | |
529 | */ | |
530 | pthread_mutex_lock(socket->lock); | |
331744e3 JD |
531 | ret = ust_app_push_metadata(registry, socket, 0); |
532 | pthread_mutex_unlock(socket->lock); | |
d88aee68 | 533 | if (ret < 0) { |
331744e3 | 534 | ret_val = ret; |
d88aee68 DG |
535 | goto error_rcu_unlock; |
536 | } | |
537 | ||
d88aee68 | 538 | rcu_read_unlock(); |
d88aee68 DG |
539 | return 0; |
540 | ||
d88aee68 | 541 | error_rcu_unlock: |
1b532a60 DG |
542 | /* |
543 | * On error, flag the registry that the metadata is closed. We were unable | |
544 | * to push anything and this means that either the consumer is not | |
545 | * responding or the metadata cache has been destroyed on the consumer. | |
546 | */ | |
547 | registry->metadata_closed = 1; | |
548 | end_rcu_unlock: | |
d88aee68 | 549 | rcu_read_unlock(); |
331744e3 | 550 | return ret_val; |
d88aee68 DG |
551 | } |
552 | ||
553 | /* | |
554 | * Send to the consumer a close metadata command for the given session. Once | |
555 | * done, the metadata channel is deleted and the session metadata pointer is | |
556 | * nullified. The session lock MUST be acquired here unless the application is | |
557 | * in the destroy path. | |
558 | * | |
559 | * Return 0 on success else a negative value. | |
560 | */ | |
7972aab2 DG |
561 | static int close_metadata(struct ust_registry_session *registry, |
562 | struct consumer_output *consumer) | |
d88aee68 DG |
563 | { |
564 | int ret; | |
565 | struct consumer_socket *socket; | |
566 | ||
7972aab2 DG |
567 | assert(registry); |
568 | assert(consumer); | |
d88aee68 | 569 | |
7972aab2 DG |
570 | rcu_read_lock(); |
571 | ||
572 | if (!registry->metadata_key || registry->metadata_closed) { | |
d88aee68 | 573 | ret = 0; |
1b532a60 | 574 | goto end; |
d88aee68 DG |
575 | } |
576 | ||
d88aee68 | 577 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
578 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
579 | consumer); | |
d88aee68 DG |
580 | if (!socket) { |
581 | ret = -1; | |
7972aab2 | 582 | goto error; |
d88aee68 DG |
583 | } |
584 | ||
7972aab2 | 585 | ret = consumer_close_metadata(socket, registry->metadata_key); |
d88aee68 | 586 | if (ret < 0) { |
7972aab2 | 587 | goto error; |
d88aee68 DG |
588 | } |
589 | ||
d88aee68 | 590 | error: |
1b532a60 DG |
591 | /* |
592 | * Metadata closed. Even on error this means that the consumer is not | |
593 | * responding or not found so either way a second close should NOT be emit | |
594 | * for this registry. | |
595 | */ | |
596 | registry->metadata_closed = 1; | |
597 | end: | |
7972aab2 | 598 | rcu_read_unlock(); |
d88aee68 DG |
599 | return ret; |
600 | } | |
601 | ||
36b588ed MD |
602 | /* |
603 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
604 | * section and outside of call_rcu thread, so we postpone its execution |
605 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
606 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
607 | */ |
608 | static | |
609 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
610 | { | |
611 | struct ust_app_session *ua_sess = | |
612 | caa_container_of(head, struct ust_app_session, rcu_head); | |
613 | ||
0b2dc8df | 614 | ht_cleanup_push(ua_sess->channels); |
36b588ed MD |
615 | free(ua_sess); |
616 | } | |
617 | ||
d80a6244 DG |
618 | /* |
619 | * Delete ust app session safely. RCU read lock must be held before calling | |
620 | * this function. | |
621 | */ | |
8b366481 | 622 | static |
d0b96690 DG |
623 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
624 | struct ust_app *app) | |
d80a6244 DG |
625 | { |
626 | int ret; | |
bec39940 | 627 | struct lttng_ht_iter iter; |
d80a6244 | 628 | struct ust_app_channel *ua_chan; |
7972aab2 | 629 | struct ust_registry_session *registry; |
d80a6244 | 630 | |
d88aee68 DG |
631 | assert(ua_sess); |
632 | ||
1b532a60 DG |
633 | pthread_mutex_lock(&ua_sess->lock); |
634 | ||
7972aab2 | 635 | registry = get_session_registry(ua_sess); |
1b532a60 | 636 | if (registry && !registry->metadata_closed) { |
d88aee68 | 637 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 638 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 639 | |
7972aab2 DG |
640 | /* |
641 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
642 | * metadata only on destroy trace session in this case. Also, the |
643 | * previous push metadata could have flag the metadata registry to | |
644 | * close so don't send a close command if closed. | |
7972aab2 | 645 | */ |
1b532a60 DG |
646 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID && |
647 | !registry->metadata_closed) { | |
7972aab2 DG |
648 | /* And ask to close it for this session registry. */ |
649 | (void) close_metadata(registry, ua_sess->consumer); | |
650 | } | |
d80a6244 DG |
651 | } |
652 | ||
bec39940 DG |
653 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
654 | node.node) { | |
655 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 656 | assert(!ret); |
d0b96690 | 657 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 658 | } |
d80a6244 | 659 | |
7972aab2 DG |
660 | /* In case of per PID, the registry is kept in the session. */ |
661 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
662 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
663 | if (reg_pid) { | |
664 | buffer_reg_pid_remove(reg_pid); | |
665 | buffer_reg_pid_destroy(reg_pid); | |
666 | } | |
667 | } | |
d0b96690 | 668 | |
aee6bafd | 669 | if (ua_sess->handle != -1) { |
ffe60014 DG |
670 | ret = ustctl_release_handle(sock, ua_sess->handle); |
671 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
672 | ERR("UST app sock %d release session handle failed with ret %d", | |
673 | sock, ret); | |
674 | } | |
aee6bafd | 675 | } |
1b532a60 DG |
676 | pthread_mutex_unlock(&ua_sess->lock); |
677 | ||
36b588ed | 678 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 679 | } |
91d76f53 DG |
680 | |
681 | /* | |
284d8f55 DG |
682 | * Delete a traceable application structure from the global list. Never call |
683 | * this function outside of a call_rcu call. | |
36b588ed MD |
684 | * |
685 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 686 | */ |
8b366481 DG |
687 | static |
688 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 689 | { |
8b366481 | 690 | int ret, sock; |
d42f20df | 691 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 692 | |
d80a6244 | 693 | /* Delete ust app sessions info */ |
852d0037 DG |
694 | sock = app->sock; |
695 | app->sock = -1; | |
d80a6244 | 696 | |
8b366481 | 697 | /* Wipe sessions */ |
d42f20df DG |
698 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
699 | teardown_node) { | |
700 | /* Free every object in the session and the session. */ | |
36b588ed | 701 | rcu_read_lock(); |
d0b96690 | 702 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 703 | rcu_read_unlock(); |
d80a6244 | 704 | } |
36b588ed | 705 | |
0b2dc8df MD |
706 | ht_cleanup_push(app->sessions); |
707 | ht_cleanup_push(app->ust_objd); | |
d80a6244 | 708 | |
6414a713 | 709 | /* |
852d0037 DG |
710 | * Wait until we have deleted the application from the sock hash table |
711 | * before closing this socket, otherwise an application could re-use the | |
712 | * socket ID and race with the teardown, using the same hash table entry. | |
713 | * | |
714 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
715 | * all RCU readers that could run concurrently with unregister app, | |
716 | * therefore we _need_ to only close that socket after a grace period. So | |
717 | * it should stay in this RCU callback. | |
718 | * | |
719 | * This close() is a very important step of the synchronization model so | |
720 | * every modification to this function must be carefully reviewed. | |
6414a713 | 721 | */ |
799e2c4f MD |
722 | ret = close(sock); |
723 | if (ret) { | |
724 | PERROR("close"); | |
725 | } | |
4063050c | 726 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 727 | |
852d0037 | 728 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 729 | free(app); |
099e26bd DG |
730 | } |
731 | ||
732 | /* | |
f6a9efaa | 733 | * URCU intermediate call to delete an UST app. |
099e26bd | 734 | */ |
8b366481 DG |
735 | static |
736 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 737 | { |
bec39940 DG |
738 | struct lttng_ht_node_ulong *node = |
739 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 740 | struct ust_app *app = |
852d0037 | 741 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 742 | |
852d0037 | 743 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 744 | delete_ust_app(app); |
099e26bd DG |
745 | } |
746 | ||
ffe60014 DG |
747 | /* |
748 | * Delete the session from the application ht and delete the data structure by | |
749 | * freeing every object inside and releasing them. | |
750 | */ | |
d0b96690 | 751 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
752 | struct ust_app_session *ua_sess) |
753 | { | |
754 | int ret; | |
755 | struct lttng_ht_iter iter; | |
756 | ||
757 | assert(app); | |
758 | assert(ua_sess); | |
759 | ||
760 | iter.iter.node = &ua_sess->node.node; | |
761 | ret = lttng_ht_del(app->sessions, &iter); | |
762 | if (ret) { | |
763 | /* Already scheduled for teardown. */ | |
764 | goto end; | |
765 | } | |
766 | ||
767 | /* Once deleted, free the data structure. */ | |
d0b96690 | 768 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
769 | |
770 | end: | |
771 | return; | |
772 | } | |
773 | ||
8b366481 DG |
774 | /* |
775 | * Alloc new UST app session. | |
776 | */ | |
777 | static | |
d0b96690 | 778 | struct ust_app_session *alloc_ust_app_session(struct ust_app *app) |
8b366481 DG |
779 | { |
780 | struct ust_app_session *ua_sess; | |
781 | ||
782 | /* Init most of the default value by allocating and zeroing */ | |
783 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
784 | if (ua_sess == NULL) { | |
785 | PERROR("malloc"); | |
ffe60014 | 786 | goto error_free; |
8b366481 DG |
787 | } |
788 | ||
789 | ua_sess->handle = -1; | |
bec39940 | 790 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
d0b96690 | 791 | pthread_mutex_init(&ua_sess->lock, NULL); |
ffe60014 | 792 | |
8b366481 DG |
793 | return ua_sess; |
794 | ||
ffe60014 | 795 | error_free: |
8b366481 DG |
796 | return NULL; |
797 | } | |
798 | ||
799 | /* | |
800 | * Alloc new UST app channel. | |
801 | */ | |
802 | static | |
803 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 804 | struct ust_app_session *ua_sess, |
ffe60014 | 805 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
806 | { |
807 | struct ust_app_channel *ua_chan; | |
808 | ||
809 | /* Init most of the default value by allocating and zeroing */ | |
810 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
811 | if (ua_chan == NULL) { | |
812 | PERROR("malloc"); | |
813 | goto error; | |
814 | } | |
815 | ||
816 | /* Setup channel name */ | |
817 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
818 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
819 | ||
820 | ua_chan->enabled = 1; | |
821 | ua_chan->handle = -1; | |
45893984 | 822 | ua_chan->session = ua_sess; |
ffe60014 | 823 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
824 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
825 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
826 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
827 | |
828 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
31746f93 | 829 | CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); |
8b366481 DG |
830 | |
831 | /* Copy attributes */ | |
832 | if (attr) { | |
ffe60014 | 833 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
834 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
835 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
836 | ua_chan->attr.overwrite = attr->overwrite; | |
837 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
838 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
839 | ua_chan->attr.output = attr->output; | |
8b366481 | 840 | } |
ffe60014 DG |
841 | /* By default, the channel is a per cpu channel. */ |
842 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
843 | |
844 | DBG3("UST app channel %s allocated", ua_chan->name); | |
845 | ||
846 | return ua_chan; | |
847 | ||
848 | error: | |
849 | return NULL; | |
850 | } | |
851 | ||
37f1c236 DG |
852 | /* |
853 | * Allocate and initialize a UST app stream. | |
854 | * | |
855 | * Return newly allocated stream pointer or NULL on error. | |
856 | */ | |
ffe60014 | 857 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
858 | { |
859 | struct ust_app_stream *stream = NULL; | |
860 | ||
861 | stream = zmalloc(sizeof(*stream)); | |
862 | if (stream == NULL) { | |
863 | PERROR("zmalloc ust app stream"); | |
864 | goto error; | |
865 | } | |
866 | ||
867 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
868 | stream->handle = -1; | |
869 | ||
870 | error: | |
871 | return stream; | |
872 | } | |
873 | ||
8b366481 DG |
874 | /* |
875 | * Alloc new UST app event. | |
876 | */ | |
877 | static | |
878 | struct ust_app_event *alloc_ust_app_event(char *name, | |
879 | struct lttng_ust_event *attr) | |
880 | { | |
881 | struct ust_app_event *ua_event; | |
882 | ||
883 | /* Init most of the default value by allocating and zeroing */ | |
884 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
885 | if (ua_event == NULL) { | |
886 | PERROR("malloc"); | |
887 | goto error; | |
888 | } | |
889 | ||
890 | ua_event->enabled = 1; | |
891 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
892 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 893 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
894 | |
895 | /* Copy attributes */ | |
896 | if (attr) { | |
897 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
898 | } | |
899 | ||
900 | DBG3("UST app event %s allocated", ua_event->name); | |
901 | ||
902 | return ua_event; | |
903 | ||
904 | error: | |
905 | return NULL; | |
906 | } | |
907 | ||
908 | /* | |
909 | * Alloc new UST app context. | |
910 | */ | |
911 | static | |
912 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx) | |
913 | { | |
914 | struct ust_app_ctx *ua_ctx; | |
915 | ||
916 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
917 | if (ua_ctx == NULL) { | |
918 | goto error; | |
919 | } | |
920 | ||
31746f93 DG |
921 | CDS_INIT_LIST_HEAD(&ua_ctx->list); |
922 | ||
8b366481 DG |
923 | if (uctx) { |
924 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
925 | } | |
926 | ||
927 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
928 | ||
929 | error: | |
930 | return ua_ctx; | |
931 | } | |
932 | ||
025faf73 DG |
933 | /* |
934 | * Allocate a filter and copy the given original filter. | |
935 | * | |
936 | * Return allocated filter or NULL on error. | |
937 | */ | |
938 | static struct lttng_ust_filter_bytecode *alloc_copy_ust_app_filter( | |
939 | struct lttng_ust_filter_bytecode *orig_f) | |
940 | { | |
941 | struct lttng_ust_filter_bytecode *filter = NULL; | |
942 | ||
943 | /* Copy filter bytecode */ | |
944 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
945 | if (!filter) { | |
946 | PERROR("zmalloc alloc ust app filter"); | |
947 | goto error; | |
948 | } | |
949 | ||
950 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
951 | ||
952 | error: | |
953 | return filter; | |
954 | } | |
955 | ||
099e26bd | 956 | /* |
421cb601 DG |
957 | * Find an ust_app using the sock and return it. RCU read side lock must be |
958 | * held before calling this helper function. | |
099e26bd | 959 | */ |
8b366481 DG |
960 | static |
961 | struct ust_app *find_app_by_sock(int sock) | |
099e26bd | 962 | { |
bec39940 | 963 | struct lttng_ht_node_ulong *node; |
bec39940 | 964 | struct lttng_ht_iter iter; |
f6a9efaa | 965 | |
852d0037 | 966 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 967 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
968 | if (node == NULL) { |
969 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
970 | goto error; |
971 | } | |
852d0037 DG |
972 | |
973 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
974 | |
975 | error: | |
976 | return NULL; | |
099e26bd DG |
977 | } |
978 | ||
d0b96690 DG |
979 | /* |
980 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
981 | * be held before calling this helper function. | |
982 | */ | |
983 | static struct ust_app *find_app_by_notify_sock(int sock) | |
984 | { | |
985 | struct lttng_ht_node_ulong *node; | |
986 | struct lttng_ht_iter iter; | |
987 | ||
988 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
989 | &iter); | |
990 | node = lttng_ht_iter_get_node_ulong(&iter); | |
991 | if (node == NULL) { | |
992 | DBG2("UST app find by notify sock %d not found", sock); | |
993 | goto error; | |
994 | } | |
995 | ||
996 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
997 | ||
998 | error: | |
999 | return NULL; | |
1000 | } | |
1001 | ||
025faf73 DG |
1002 | /* |
1003 | * Lookup for an ust app event based on event name, filter bytecode and the | |
1004 | * event loglevel. | |
1005 | * | |
1006 | * Return an ust_app_event object or NULL on error. | |
1007 | */ | |
18eace3b DG |
1008 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
1009 | char *name, struct lttng_ust_filter_bytecode *filter, int loglevel) | |
1010 | { | |
1011 | struct lttng_ht_iter iter; | |
1012 | struct lttng_ht_node_str *node; | |
1013 | struct ust_app_event *event = NULL; | |
1014 | struct ust_app_ht_key key; | |
18eace3b DG |
1015 | |
1016 | assert(name); | |
1017 | assert(ht); | |
1018 | ||
1019 | /* Setup key for event lookup. */ | |
1020 | key.name = name; | |
1021 | key.filter = filter; | |
1022 | key.loglevel = loglevel; | |
1023 | ||
025faf73 DG |
1024 | /* Lookup using the event name as hash and a custom match fct. */ |
1025 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1026 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1027 | node = lttng_ht_iter_get_node_str(&iter); |
1028 | if (node == NULL) { | |
1029 | goto end; | |
1030 | } | |
1031 | ||
1032 | event = caa_container_of(node, struct ust_app_event, node); | |
1033 | ||
1034 | end: | |
18eace3b DG |
1035 | return event; |
1036 | } | |
1037 | ||
55cc08a6 DG |
1038 | /* |
1039 | * Create the channel context on the tracer. | |
d0b96690 DG |
1040 | * |
1041 | * Called with UST app session lock held. | |
55cc08a6 DG |
1042 | */ |
1043 | static | |
1044 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1045 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1046 | { | |
1047 | int ret; | |
1048 | ||
840cb59c | 1049 | health_code_update(); |
86acf0da | 1050 | |
852d0037 | 1051 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 DG |
1052 | ua_chan->obj, &ua_ctx->obj); |
1053 | if (ret < 0) { | |
ffe60014 DG |
1054 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1055 | ERR("UST app create channel context failed for app (pid: %d) " | |
1056 | "with ret %d", app->pid, ret); | |
1057 | } else { | |
1058 | DBG3("UST app disable event failed. Application is dead."); | |
1059 | } | |
55cc08a6 DG |
1060 | goto error; |
1061 | } | |
1062 | ||
1063 | ua_ctx->handle = ua_ctx->obj->handle; | |
1064 | ||
d0b96690 DG |
1065 | DBG2("UST app context handle %d created successfully for channel %s", |
1066 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1067 | |
1068 | error: | |
840cb59c | 1069 | health_code_update(); |
55cc08a6 DG |
1070 | return ret; |
1071 | } | |
1072 | ||
53a80697 MD |
1073 | /* |
1074 | * Set the filter on the tracer. | |
1075 | */ | |
1076 | static | |
1077 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
1078 | struct ust_app *app) | |
1079 | { | |
1080 | int ret; | |
1081 | ||
840cb59c | 1082 | health_code_update(); |
86acf0da | 1083 | |
53a80697 | 1084 | if (!ua_event->filter) { |
86acf0da DG |
1085 | ret = 0; |
1086 | goto error; | |
53a80697 MD |
1087 | } |
1088 | ||
1089 | ret = ustctl_set_filter(app->sock, ua_event->filter, | |
1090 | ua_event->obj); | |
1091 | if (ret < 0) { | |
ffe60014 DG |
1092 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1093 | ERR("UST app event %s filter failed for app (pid: %d) " | |
1094 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1095 | } else { | |
1096 | DBG3("UST app filter event failed. Application is dead."); | |
1097 | } | |
53a80697 MD |
1098 | goto error; |
1099 | } | |
1100 | ||
1101 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
1102 | ||
1103 | error: | |
840cb59c | 1104 | health_code_update(); |
53a80697 MD |
1105 | return ret; |
1106 | } | |
1107 | ||
9730260e DG |
1108 | /* |
1109 | * Disable the specified event on to UST tracer for the UST session. | |
1110 | */ | |
1111 | static int disable_ust_event(struct ust_app *app, | |
1112 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1113 | { | |
1114 | int ret; | |
1115 | ||
840cb59c | 1116 | health_code_update(); |
86acf0da | 1117 | |
852d0037 | 1118 | ret = ustctl_disable(app->sock, ua_event->obj); |
9730260e | 1119 | if (ret < 0) { |
ffe60014 DG |
1120 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1121 | ERR("UST app event %s disable failed for app (pid: %d) " | |
1122 | "and session handle %d with ret %d", | |
1123 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1124 | } else { | |
1125 | DBG3("UST app disable event failed. Application is dead."); | |
1126 | } | |
9730260e DG |
1127 | goto error; |
1128 | } | |
1129 | ||
1130 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 1131 | ua_event->attr.name, app->pid); |
9730260e DG |
1132 | |
1133 | error: | |
840cb59c | 1134 | health_code_update(); |
9730260e DG |
1135 | return ret; |
1136 | } | |
1137 | ||
78f0bacd DG |
1138 | /* |
1139 | * Disable the specified channel on to UST tracer for the UST session. | |
1140 | */ | |
1141 | static int disable_ust_channel(struct ust_app *app, | |
1142 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1143 | { | |
1144 | int ret; | |
1145 | ||
840cb59c | 1146 | health_code_update(); |
86acf0da | 1147 | |
852d0037 | 1148 | ret = ustctl_disable(app->sock, ua_chan->obj); |
78f0bacd | 1149 | if (ret < 0) { |
ffe60014 DG |
1150 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1151 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1152 | "and session handle %d with ret %d", | |
1153 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1154 | } else { | |
1155 | DBG3("UST app disable channel failed. Application is dead."); | |
1156 | } | |
78f0bacd DG |
1157 | goto error; |
1158 | } | |
1159 | ||
78f0bacd | 1160 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1161 | ua_chan->name, app->pid); |
78f0bacd DG |
1162 | |
1163 | error: | |
840cb59c | 1164 | health_code_update(); |
78f0bacd DG |
1165 | return ret; |
1166 | } | |
1167 | ||
1168 | /* | |
1169 | * Enable the specified channel on to UST tracer for the UST session. | |
1170 | */ | |
1171 | static int enable_ust_channel(struct ust_app *app, | |
1172 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1173 | { | |
1174 | int ret; | |
1175 | ||
840cb59c | 1176 | health_code_update(); |
86acf0da | 1177 | |
852d0037 | 1178 | ret = ustctl_enable(app->sock, ua_chan->obj); |
78f0bacd | 1179 | if (ret < 0) { |
ffe60014 DG |
1180 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1181 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1182 | "and session handle %d with ret %d", | |
1183 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1184 | } else { | |
1185 | DBG3("UST app enable channel failed. Application is dead."); | |
1186 | } | |
78f0bacd DG |
1187 | goto error; |
1188 | } | |
1189 | ||
1190 | ua_chan->enabled = 1; | |
1191 | ||
1192 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1193 | ua_chan->name, app->pid); |
78f0bacd DG |
1194 | |
1195 | error: | |
840cb59c | 1196 | health_code_update(); |
78f0bacd DG |
1197 | return ret; |
1198 | } | |
1199 | ||
edb67388 DG |
1200 | /* |
1201 | * Enable the specified event on to UST tracer for the UST session. | |
1202 | */ | |
1203 | static int enable_ust_event(struct ust_app *app, | |
1204 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1205 | { | |
1206 | int ret; | |
1207 | ||
840cb59c | 1208 | health_code_update(); |
86acf0da | 1209 | |
852d0037 | 1210 | ret = ustctl_enable(app->sock, ua_event->obj); |
edb67388 | 1211 | if (ret < 0) { |
ffe60014 DG |
1212 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1213 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1214 | "and session handle %d with ret %d", | |
1215 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1216 | } else { | |
1217 | DBG3("UST app enable event failed. Application is dead."); | |
1218 | } | |
edb67388 DG |
1219 | goto error; |
1220 | } | |
1221 | ||
1222 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1223 | ua_event->attr.name, app->pid); |
edb67388 DG |
1224 | |
1225 | error: | |
840cb59c | 1226 | health_code_update(); |
edb67388 DG |
1227 | return ret; |
1228 | } | |
1229 | ||
099e26bd | 1230 | /* |
7972aab2 | 1231 | * Send channel and stream buffer to application. |
4f3ab6ee | 1232 | * |
ffe60014 | 1233 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1234 | */ |
7972aab2 DG |
1235 | static int send_channel_pid_to_ust(struct ust_app *app, |
1236 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1237 | { |
1238 | int ret; | |
ffe60014 | 1239 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1240 | |
1241 | assert(app); | |
ffe60014 | 1242 | assert(ua_sess); |
4f3ab6ee | 1243 | assert(ua_chan); |
4f3ab6ee | 1244 | |
840cb59c | 1245 | health_code_update(); |
4f3ab6ee | 1246 | |
7972aab2 DG |
1247 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1248 | app->sock); | |
86acf0da | 1249 | |
ffe60014 DG |
1250 | /* Send channel to the application. */ |
1251 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
5b4a0ec0 | 1252 | if (ret < 0) { |
b551a063 DG |
1253 | goto error; |
1254 | } | |
1255 | ||
d88aee68 DG |
1256 | health_code_update(); |
1257 | ||
ffe60014 DG |
1258 | /* Send all streams to application. */ |
1259 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1260 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
1261 | if (ret < 0) { | |
1262 | goto error; | |
1263 | } | |
1264 | /* We don't need the stream anymore once sent to the tracer. */ | |
1265 | cds_list_del(&stream->list); | |
1266 | delete_ust_app_stream(-1, stream); | |
1267 | } | |
ffe60014 DG |
1268 | /* Flag the channel that it is sent to the application. */ |
1269 | ua_chan->is_sent = 1; | |
ffe60014 | 1270 | |
b551a063 | 1271 | error: |
840cb59c | 1272 | health_code_update(); |
b551a063 DG |
1273 | return ret; |
1274 | } | |
1275 | ||
91d76f53 | 1276 | /* |
5b4a0ec0 | 1277 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1278 | * |
1279 | * Should be called with session mutex held. | |
91d76f53 | 1280 | */ |
edb67388 DG |
1281 | static |
1282 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1283 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1284 | { |
5b4a0ec0 | 1285 | int ret = 0; |
284d8f55 | 1286 | |
840cb59c | 1287 | health_code_update(); |
86acf0da | 1288 | |
5b4a0ec0 | 1289 | /* Create UST event on tracer */ |
852d0037 | 1290 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 DG |
1291 | &ua_event->obj); |
1292 | if (ret < 0) { | |
ffe60014 DG |
1293 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1294 | ERR("Error ustctl create event %s for app pid: %d with ret %d", | |
1295 | ua_event->attr.name, app->pid, ret); | |
1296 | } else { | |
1297 | DBG3("UST app create event failed. Application is dead."); | |
1298 | } | |
5b4a0ec0 | 1299 | goto error; |
91d76f53 | 1300 | } |
f6a9efaa | 1301 | |
5b4a0ec0 | 1302 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1303 | |
5b4a0ec0 | 1304 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1305 | ua_event->attr.name, app->pid); |
f6a9efaa | 1306 | |
840cb59c | 1307 | health_code_update(); |
86acf0da | 1308 | |
025faf73 DG |
1309 | /* Set filter if one is present. */ |
1310 | if (ua_event->filter) { | |
1311 | ret = set_ust_event_filter(ua_event, app); | |
1312 | if (ret < 0) { | |
1313 | goto error; | |
1314 | } | |
1315 | } | |
1316 | ||
8535a6d9 | 1317 | /* If event not enabled, disable it on the tracer */ |
fc34caaa | 1318 | if (ua_event->enabled == 0) { |
8535a6d9 DG |
1319 | ret = disable_ust_event(app, ua_sess, ua_event); |
1320 | if (ret < 0) { | |
fc34caaa DG |
1321 | /* |
1322 | * If we hit an EPERM, something is wrong with our disable call. If | |
1323 | * we get an EEXIST, there is a problem on the tracer side since we | |
1324 | * just created it. | |
1325 | */ | |
1326 | switch (ret) { | |
49c336c1 | 1327 | case -LTTNG_UST_ERR_PERM: |
fc34caaa DG |
1328 | /* Code flow problem */ |
1329 | assert(0); | |
49c336c1 | 1330 | case -LTTNG_UST_ERR_EXIST: |
fc34caaa DG |
1331 | /* It's OK for our use case. */ |
1332 | ret = 0; | |
1333 | break; | |
1334 | default: | |
1335 | break; | |
1336 | } | |
8535a6d9 DG |
1337 | goto error; |
1338 | } | |
1339 | } | |
1340 | ||
5b4a0ec0 | 1341 | error: |
840cb59c | 1342 | health_code_update(); |
5b4a0ec0 | 1343 | return ret; |
91d76f53 | 1344 | } |
48842b30 | 1345 | |
5b4a0ec0 DG |
1346 | /* |
1347 | * Copy data between an UST app event and a LTT event. | |
1348 | */ | |
421cb601 | 1349 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1350 | struct ltt_ust_event *uevent) |
1351 | { | |
1352 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); | |
1353 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1354 | ||
fc34caaa DG |
1355 | ua_event->enabled = uevent->enabled; |
1356 | ||
5b4a0ec0 DG |
1357 | /* Copy event attributes */ |
1358 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1359 | ||
53a80697 MD |
1360 | /* Copy filter bytecode */ |
1361 | if (uevent->filter) { | |
025faf73 DG |
1362 | ua_event->filter = alloc_copy_ust_app_filter(uevent->filter); |
1363 | /* Filter might be NULL here in case of ENONEM. */ | |
53a80697 | 1364 | } |
48842b30 DG |
1365 | } |
1366 | ||
5b4a0ec0 DG |
1367 | /* |
1368 | * Copy data between an UST app channel and a LTT channel. | |
1369 | */ | |
421cb601 | 1370 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1371 | struct ltt_ust_channel *uchan) |
1372 | { | |
bec39940 | 1373 | struct lttng_ht_iter iter; |
48842b30 | 1374 | struct ltt_ust_event *uevent; |
55cc08a6 | 1375 | struct ltt_ust_context *uctx; |
48842b30 | 1376 | struct ust_app_event *ua_event; |
55cc08a6 | 1377 | struct ust_app_ctx *ua_ctx; |
48842b30 | 1378 | |
fc34caaa | 1379 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1380 | |
1381 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1382 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 1383 | |
1624d5b7 JD |
1384 | ua_chan->tracefile_size = uchan->tracefile_size; |
1385 | ua_chan->tracefile_count = uchan->tracefile_count; | |
1386 | ||
ffe60014 DG |
1387 | /* Copy event attributes since the layout is different. */ |
1388 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1389 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1390 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1391 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1392 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
1393 | ua_chan->attr.output = uchan->attr.output; | |
1394 | /* | |
1395 | * Note that the attribute channel type is not set since the channel on the | |
1396 | * tracing registry side does not have this information. | |
1397 | */ | |
48842b30 | 1398 | |
fc34caaa | 1399 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1400 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1401 | |
31746f93 | 1402 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { |
55cc08a6 DG |
1403 | ua_ctx = alloc_ust_app_ctx(&uctx->ctx); |
1404 | if (ua_ctx == NULL) { | |
1405 | continue; | |
1406 | } | |
bec39940 DG |
1407 | lttng_ht_node_init_ulong(&ua_ctx->node, |
1408 | (unsigned long) ua_ctx->ctx.ctx); | |
1409 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
31746f93 | 1410 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
55cc08a6 | 1411 | } |
48842b30 | 1412 | |
421cb601 | 1413 | /* Copy all events from ltt ust channel to ust app channel */ |
bec39940 | 1414 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
18eace3b DG |
1415 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
1416 | uevent->filter, uevent->attr.loglevel); | |
1417 | if (ua_event == NULL) { | |
421cb601 | 1418 | DBG2("UST event %s not found on shadow copy channel", |
48842b30 | 1419 | uevent->attr.name); |
284d8f55 | 1420 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
48842b30 | 1421 | if (ua_event == NULL) { |
5b4a0ec0 | 1422 | continue; |
48842b30 | 1423 | } |
421cb601 | 1424 | shadow_copy_event(ua_event, uevent); |
d0b96690 | 1425 | add_unique_ust_app_event(ua_chan, ua_event); |
48842b30 | 1426 | } |
48842b30 DG |
1427 | } |
1428 | ||
fc34caaa | 1429 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1430 | } |
1431 | ||
5b4a0ec0 DG |
1432 | /* |
1433 | * Copy data between a UST app session and a regular LTT session. | |
1434 | */ | |
421cb601 | 1435 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1436 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1437 | { |
bec39940 DG |
1438 | struct lttng_ht_node_str *ua_chan_node; |
1439 | struct lttng_ht_iter iter; | |
48842b30 DG |
1440 | struct ltt_ust_channel *uchan; |
1441 | struct ust_app_channel *ua_chan; | |
477d7741 MD |
1442 | time_t rawtime; |
1443 | struct tm *timeinfo; | |
1444 | char datetime[16]; | |
1445 | int ret; | |
1446 | ||
1447 | /* Get date and time for unique app path */ | |
1448 | time(&rawtime); | |
1449 | timeinfo = localtime(&rawtime); | |
1450 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1451 | |
421cb601 | 1452 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1453 | |
7972aab2 DG |
1454 | ua_sess->tracing_id = usess->id; |
1455 | ua_sess->id = get_next_session_id(); | |
1456 | ua_sess->uid = app->uid; | |
1457 | ua_sess->gid = app->gid; | |
1458 | ua_sess->euid = usess->uid; | |
1459 | ua_sess->egid = usess->gid; | |
1460 | ua_sess->buffer_type = usess->buffer_type; | |
1461 | ua_sess->bits_per_long = app->bits_per_long; | |
1462 | /* There is only one consumer object per session possible. */ | |
1463 | ua_sess->consumer = usess->consumer; | |
2bba9e53 | 1464 | ua_sess->output_traces = usess->output_traces; |
7972aab2 DG |
1465 | |
1466 | switch (ua_sess->buffer_type) { | |
1467 | case LTTNG_BUFFER_PER_PID: | |
1468 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 1469 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
1470 | datetime); |
1471 | break; | |
1472 | case LTTNG_BUFFER_PER_UID: | |
1473 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1474 | DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long); | |
1475 | break; | |
1476 | default: | |
1477 | assert(0); | |
1478 | goto error; | |
1479 | } | |
477d7741 MD |
1480 | if (ret < 0) { |
1481 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1482 | assert(0); |
7972aab2 | 1483 | goto error; |
477d7741 MD |
1484 | } |
1485 | ||
48842b30 | 1486 | /* Iterate over all channels in global domain. */ |
bec39940 DG |
1487 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, |
1488 | uchan, node.node) { | |
1489 | struct lttng_ht_iter uiter; | |
ba767faf | 1490 | |
bec39940 DG |
1491 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
1492 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
5b4a0ec0 | 1493 | if (ua_chan_node != NULL) { |
fc34caaa | 1494 | /* Session exist. Contiuing. */ |
5b4a0ec0 DG |
1495 | continue; |
1496 | } | |
421cb601 | 1497 | |
5b4a0ec0 DG |
1498 | DBG2("Channel %s not found on shadow session copy, creating it", |
1499 | uchan->name); | |
d0b96690 | 1500 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
5b4a0ec0 | 1501 | if (ua_chan == NULL) { |
fc34caaa | 1502 | /* malloc failed FIXME: Might want to do handle ENOMEM .. */ |
5b4a0ec0 | 1503 | continue; |
48842b30 | 1504 | } |
5b4a0ec0 | 1505 | shadow_copy_channel(ua_chan, uchan); |
ffe60014 DG |
1506 | /* |
1507 | * The concept of metadata channel does not exist on the tracing | |
1508 | * registry side of the session daemon so this can only be a per CPU | |
1509 | * channel and not metadata. | |
1510 | */ | |
1511 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
1512 | ||
bec39940 | 1513 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); |
48842b30 | 1514 | } |
7972aab2 DG |
1515 | |
1516 | error: | |
1517 | return; | |
48842b30 DG |
1518 | } |
1519 | ||
78f0bacd DG |
1520 | /* |
1521 | * Lookup sesison wrapper. | |
1522 | */ | |
84cd17c6 MD |
1523 | static |
1524 | void __lookup_session_by_app(struct ltt_ust_session *usess, | |
bec39940 | 1525 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1526 | { |
1527 | /* Get right UST app session from app */ | |
d9bf3ca4 | 1528 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
1529 | } |
1530 | ||
421cb601 DG |
1531 | /* |
1532 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1533 | * id. |
421cb601 | 1534 | */ |
48842b30 DG |
1535 | static struct ust_app_session *lookup_session_by_app( |
1536 | struct ltt_ust_session *usess, struct ust_app *app) | |
1537 | { | |
bec39940 | 1538 | struct lttng_ht_iter iter; |
d9bf3ca4 | 1539 | struct lttng_ht_node_u64 *node; |
48842b30 | 1540 | |
84cd17c6 | 1541 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 1542 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
1543 | if (node == NULL) { |
1544 | goto error; | |
1545 | } | |
1546 | ||
1547 | return caa_container_of(node, struct ust_app_session, node); | |
1548 | ||
1549 | error: | |
1550 | return NULL; | |
1551 | } | |
1552 | ||
7972aab2 DG |
1553 | /* |
1554 | * Setup buffer registry per PID for the given session and application. If none | |
1555 | * is found, a new one is created, added to the global registry and | |
1556 | * initialized. If regp is valid, it's set with the newly created object. | |
1557 | * | |
1558 | * Return 0 on success or else a negative value. | |
1559 | */ | |
1560 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
1561 | struct ust_app *app, struct buffer_reg_pid **regp) | |
1562 | { | |
1563 | int ret = 0; | |
1564 | struct buffer_reg_pid *reg_pid; | |
1565 | ||
1566 | assert(ua_sess); | |
1567 | assert(app); | |
1568 | ||
1569 | rcu_read_lock(); | |
1570 | ||
1571 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
1572 | if (!reg_pid) { | |
1573 | /* | |
1574 | * This is the create channel path meaning that if there is NO | |
1575 | * registry available, we have to create one for this session. | |
1576 | */ | |
1577 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid); | |
1578 | if (ret < 0) { | |
1579 | goto error; | |
1580 | } | |
1581 | buffer_reg_pid_add(reg_pid); | |
1582 | } else { | |
1583 | goto end; | |
1584 | } | |
1585 | ||
1586 | /* Initialize registry. */ | |
1587 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
1588 | app->bits_per_long, app->uint8_t_alignment, | |
1589 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1590 | app->uint64_t_alignment, app->long_alignment, |
1591 | app->byte_order, app->version.major, | |
1592 | app->version.minor); | |
7972aab2 DG |
1593 | if (ret < 0) { |
1594 | goto error; | |
1595 | } | |
1596 | ||
1597 | DBG3("UST app buffer registry per PID created successfully"); | |
1598 | ||
1599 | end: | |
1600 | if (regp) { | |
1601 | *regp = reg_pid; | |
1602 | } | |
1603 | error: | |
1604 | rcu_read_unlock(); | |
1605 | return ret; | |
1606 | } | |
1607 | ||
1608 | /* | |
1609 | * Setup buffer registry per UID for the given session and application. If none | |
1610 | * is found, a new one is created, added to the global registry and | |
1611 | * initialized. If regp is valid, it's set with the newly created object. | |
1612 | * | |
1613 | * Return 0 on success or else a negative value. | |
1614 | */ | |
1615 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
1616 | struct ust_app *app, struct buffer_reg_uid **regp) | |
1617 | { | |
1618 | int ret = 0; | |
1619 | struct buffer_reg_uid *reg_uid; | |
1620 | ||
1621 | assert(usess); | |
1622 | assert(app); | |
1623 | ||
1624 | rcu_read_lock(); | |
1625 | ||
1626 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
1627 | if (!reg_uid) { | |
1628 | /* | |
1629 | * This is the create channel path meaning that if there is NO | |
1630 | * registry available, we have to create one for this session. | |
1631 | */ | |
1632 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
1633 | LTTNG_DOMAIN_UST, ®_uid); | |
1634 | if (ret < 0) { | |
1635 | goto error; | |
1636 | } | |
1637 | buffer_reg_uid_add(reg_uid); | |
1638 | } else { | |
1639 | goto end; | |
1640 | } | |
1641 | ||
1642 | /* Initialize registry. */ | |
af6142cf | 1643 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
1644 | app->bits_per_long, app->uint8_t_alignment, |
1645 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1646 | app->uint64_t_alignment, app->long_alignment, |
1647 | app->byte_order, app->version.major, | |
1648 | app->version.minor); | |
7972aab2 DG |
1649 | if (ret < 0) { |
1650 | goto error; | |
1651 | } | |
1652 | /* Add node to teardown list of the session. */ | |
1653 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
1654 | ||
1655 | DBG3("UST app buffer registry per UID created successfully"); | |
1656 | ||
1657 | end: | |
1658 | if (regp) { | |
1659 | *regp = reg_uid; | |
1660 | } | |
1661 | error: | |
1662 | rcu_read_unlock(); | |
1663 | return ret; | |
1664 | } | |
1665 | ||
421cb601 | 1666 | /* |
3d8ca23b | 1667 | * Create a session on the tracer side for the given app. |
421cb601 | 1668 | * |
3d8ca23b DG |
1669 | * On success, ua_sess_ptr is populated with the session pointer or else left |
1670 | * untouched. If the session was created, is_created is set to 1. On error, | |
1671 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
1672 | * be NULL. | |
1673 | * | |
1674 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
1675 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 1676 | */ |
3d8ca23b DG |
1677 | static int create_ust_app_session(struct ltt_ust_session *usess, |
1678 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, | |
1679 | int *is_created) | |
421cb601 | 1680 | { |
3d8ca23b | 1681 | int ret, created = 0; |
421cb601 DG |
1682 | struct ust_app_session *ua_sess; |
1683 | ||
3d8ca23b DG |
1684 | assert(usess); |
1685 | assert(app); | |
1686 | assert(ua_sess_ptr); | |
1687 | ||
840cb59c | 1688 | health_code_update(); |
86acf0da | 1689 | |
421cb601 DG |
1690 | ua_sess = lookup_session_by_app(usess, app); |
1691 | if (ua_sess == NULL) { | |
d9bf3ca4 | 1692 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 1693 | app->pid, usess->id); |
d0b96690 | 1694 | ua_sess = alloc_ust_app_session(app); |
421cb601 DG |
1695 | if (ua_sess == NULL) { |
1696 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
1697 | ret = -ENOMEM; |
1698 | goto error; | |
421cb601 | 1699 | } |
477d7741 | 1700 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 1701 | created = 1; |
421cb601 DG |
1702 | } |
1703 | ||
7972aab2 DG |
1704 | switch (usess->buffer_type) { |
1705 | case LTTNG_BUFFER_PER_PID: | |
1706 | /* Init local registry. */ | |
1707 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 1708 | if (ret < 0) { |
7972aab2 DG |
1709 | goto error; |
1710 | } | |
1711 | break; | |
1712 | case LTTNG_BUFFER_PER_UID: | |
1713 | /* Look for a global registry. If none exists, create one. */ | |
1714 | ret = setup_buffer_reg_uid(usess, app, NULL); | |
1715 | if (ret < 0) { | |
1716 | goto error; | |
1717 | } | |
1718 | break; | |
1719 | default: | |
1720 | assert(0); | |
1721 | ret = -EINVAL; | |
1722 | goto error; | |
1723 | } | |
1724 | ||
1725 | health_code_update(); | |
1726 | ||
1727 | if (ua_sess->handle == -1) { | |
1728 | ret = ustctl_create_session(app->sock); | |
1729 | if (ret < 0) { | |
1730 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1731 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
1732 | app->pid, ret); |
1733 | } else { | |
1734 | DBG("UST app creating session failed. Application is dead"); | |
1735 | } | |
d0b96690 | 1736 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
1737 | if (ret != -ENOMEM) { |
1738 | /* | |
1739 | * Tracer is probably gone or got an internal error so let's | |
1740 | * behave like it will soon unregister or not usable. | |
1741 | */ | |
1742 | ret = -ENOTCONN; | |
1743 | } | |
1744 | goto error; | |
421cb601 DG |
1745 | } |
1746 | ||
7972aab2 DG |
1747 | ua_sess->handle = ret; |
1748 | ||
1749 | /* Add ust app session to app's HT */ | |
d9bf3ca4 MD |
1750 | lttng_ht_node_init_u64(&ua_sess->node, |
1751 | ua_sess->tracing_id); | |
1752 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
7972aab2 DG |
1753 | |
1754 | DBG2("UST app session created successfully with handle %d", ret); | |
1755 | } | |
1756 | ||
1757 | *ua_sess_ptr = ua_sess; | |
1758 | if (is_created) { | |
1759 | *is_created = created; | |
1760 | } | |
1761 | ||
1762 | /* Everything went well. */ | |
1763 | ret = 0; | |
1764 | ||
1765 | error: | |
1766 | health_code_update(); | |
1767 | return ret; | |
1768 | } | |
1769 | ||
1770 | /* | |
1771 | * Create a context for the channel on the tracer. | |
1772 | * | |
1773 | * Called with UST app session lock held and a RCU read side lock. | |
1774 | */ | |
1775 | static | |
1776 | int create_ust_app_channel_context(struct ust_app_session *ua_sess, | |
1777 | struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx, | |
1778 | struct ust_app *app) | |
1779 | { | |
1780 | int ret = 0; | |
1781 | struct lttng_ht_iter iter; | |
1782 | struct lttng_ht_node_ulong *node; | |
1783 | struct ust_app_ctx *ua_ctx; | |
1784 | ||
1785 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
1786 | ||
1787 | lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter); | |
1788 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1789 | if (node != NULL) { | |
1790 | ret = -EEXIST; | |
1791 | goto error; | |
1792 | } | |
1793 | ||
1794 | ua_ctx = alloc_ust_app_ctx(uctx); | |
1795 | if (ua_ctx == NULL) { | |
1796 | /* malloc failed */ | |
1797 | ret = -1; | |
1798 | goto error; | |
1799 | } | |
1800 | ||
1801 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
1802 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
31746f93 | 1803 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
1804 | |
1805 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
1806 | if (ret < 0) { | |
1807 | goto error; | |
1808 | } | |
1809 | ||
1810 | error: | |
1811 | return ret; | |
1812 | } | |
1813 | ||
1814 | /* | |
1815 | * Enable on the tracer side a ust app event for the session and channel. | |
1816 | * | |
1817 | * Called with UST app session lock held. | |
1818 | */ | |
1819 | static | |
1820 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
1821 | struct ust_app_event *ua_event, struct ust_app *app) | |
1822 | { | |
1823 | int ret; | |
1824 | ||
1825 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1826 | if (ret < 0) { | |
1827 | goto error; | |
1828 | } | |
1829 | ||
1830 | ua_event->enabled = 1; | |
1831 | ||
1832 | error: | |
1833 | return ret; | |
1834 | } | |
1835 | ||
1836 | /* | |
1837 | * Disable on the tracer side a ust app event for the session and channel. | |
1838 | */ | |
1839 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
1840 | struct ust_app_event *ua_event, struct ust_app *app) | |
1841 | { | |
1842 | int ret; | |
1843 | ||
1844 | ret = disable_ust_event(app, ua_sess, ua_event); | |
1845 | if (ret < 0) { | |
1846 | goto error; | |
1847 | } | |
1848 | ||
1849 | ua_event->enabled = 0; | |
1850 | ||
1851 | error: | |
1852 | return ret; | |
1853 | } | |
1854 | ||
1855 | /* | |
1856 | * Lookup ust app channel for session and disable it on the tracer side. | |
1857 | */ | |
1858 | static | |
1859 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
1860 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
1861 | { | |
1862 | int ret; | |
1863 | ||
1864 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
1865 | if (ret < 0) { | |
1866 | goto error; | |
1867 | } | |
1868 | ||
1869 | ua_chan->enabled = 0; | |
1870 | ||
1871 | error: | |
1872 | return ret; | |
1873 | } | |
1874 | ||
1875 | /* | |
1876 | * Lookup ust app channel for session and enable it on the tracer side. This | |
1877 | * MUST be called with a RCU read side lock acquired. | |
1878 | */ | |
1879 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
1880 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
1881 | { | |
1882 | int ret = 0; | |
1883 | struct lttng_ht_iter iter; | |
1884 | struct lttng_ht_node_str *ua_chan_node; | |
1885 | struct ust_app_channel *ua_chan; | |
1886 | ||
1887 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
1888 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
1889 | if (ua_chan_node == NULL) { | |
d9bf3ca4 | 1890 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
1891 | uchan->name, ua_sess->tracing_id); |
1892 | goto error; | |
1893 | } | |
1894 | ||
1895 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
1896 | ||
1897 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
1898 | if (ret < 0) { | |
1899 | goto error; | |
1900 | } | |
1901 | ||
1902 | error: | |
1903 | return ret; | |
1904 | } | |
1905 | ||
1906 | /* | |
1907 | * Ask the consumer to create a channel and get it if successful. | |
1908 | * | |
1909 | * Return 0 on success or else a negative value. | |
1910 | */ | |
1911 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
1912 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
1913 | int bitness, struct ust_registry_session *registry) | |
1914 | { | |
1915 | int ret; | |
1916 | unsigned int nb_fd = 0; | |
1917 | struct consumer_socket *socket; | |
1918 | ||
1919 | assert(usess); | |
1920 | assert(ua_sess); | |
1921 | assert(ua_chan); | |
1922 | assert(registry); | |
1923 | ||
1924 | rcu_read_lock(); | |
1925 | health_code_update(); | |
1926 | ||
1927 | /* Get the right consumer socket for the application. */ | |
1928 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
1929 | if (!socket) { | |
1930 | ret = -EINVAL; | |
1931 | goto error; | |
1932 | } | |
1933 | ||
1934 | health_code_update(); | |
1935 | ||
1936 | /* Need one fd for the channel. */ | |
1937 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
1938 | if (ret < 0) { | |
1939 | ERR("Exhausted number of available FD upon create channel"); | |
1940 | goto error; | |
1941 | } | |
1942 | ||
1943 | /* | |
1944 | * Ask consumer to create channel. The consumer will return the number of | |
1945 | * stream we have to expect. | |
1946 | */ | |
1947 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
1948 | registry); | |
1949 | if (ret < 0) { | |
1950 | goto error_ask; | |
1951 | } | |
1952 | ||
1953 | /* | |
1954 | * Compute the number of fd needed before receiving them. It must be 2 per | |
1955 | * stream (2 being the default value here). | |
1956 | */ | |
1957 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
1958 | ||
1959 | /* Reserve the amount of file descriptor we need. */ | |
1960 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
1961 | if (ret < 0) { | |
1962 | ERR("Exhausted number of available FD upon create channel"); | |
1963 | goto error_fd_get_stream; | |
1964 | } | |
1965 | ||
1966 | health_code_update(); | |
1967 | ||
1968 | /* | |
1969 | * Now get the channel from the consumer. This call wil populate the stream | |
1970 | * list of that channel and set the ust objects. | |
1971 | */ | |
d9078d0c DG |
1972 | if (usess->consumer->enabled) { |
1973 | ret = ust_consumer_get_channel(socket, ua_chan); | |
1974 | if (ret < 0) { | |
1975 | goto error_destroy; | |
1976 | } | |
7972aab2 DG |
1977 | } |
1978 | ||
1979 | rcu_read_unlock(); | |
1980 | return 0; | |
1981 | ||
1982 | error_destroy: | |
1983 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
1984 | error_fd_get_stream: | |
1985 | /* | |
1986 | * Initiate a destroy channel on the consumer since we had an error | |
1987 | * handling it on our side. The return value is of no importance since we | |
1988 | * already have a ret value set by the previous error that we need to | |
1989 | * return. | |
1990 | */ | |
1991 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
1992 | error_ask: | |
1993 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
1994 | error: | |
1995 | health_code_update(); | |
1996 | rcu_read_unlock(); | |
1997 | return ret; | |
1998 | } | |
1999 | ||
2000 | /* | |
2001 | * Duplicate the ust data object of the ust app stream and save it in the | |
2002 | * buffer registry stream. | |
2003 | * | |
2004 | * Return 0 on success or else a negative value. | |
2005 | */ | |
2006 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2007 | struct ust_app_stream *stream) | |
2008 | { | |
2009 | int ret; | |
2010 | ||
2011 | assert(reg_stream); | |
2012 | assert(stream); | |
2013 | ||
2014 | /* Reserve the amount of file descriptor we need. */ | |
2015 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2016 | if (ret < 0) { | |
2017 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2018 | goto error; | |
2019 | } | |
2020 | ||
2021 | /* Duplicate object for stream once the original is in the registry. */ | |
2022 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2023 | reg_stream->obj.ust); | |
2024 | if (ret < 0) { | |
2025 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2026 | reg_stream->obj.ust, stream->obj, ret); | |
2027 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2028 | goto error; | |
2029 | } | |
2030 | stream->handle = stream->obj->handle; | |
2031 | ||
2032 | error: | |
2033 | return ret; | |
2034 | } | |
2035 | ||
2036 | /* | |
2037 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2038 | * buffer registry channel. | |
2039 | * | |
2040 | * Return 0 on success or else a negative value. | |
2041 | */ | |
2042 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2043 | struct ust_app_channel *ua_chan) | |
2044 | { | |
2045 | int ret; | |
2046 | ||
2047 | assert(reg_chan); | |
2048 | assert(ua_chan); | |
2049 | ||
2050 | /* Need two fds for the channel. */ | |
2051 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2052 | if (ret < 0) { | |
2053 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2054 | goto error_fd_get; | |
2055 | } | |
2056 | ||
2057 | /* Duplicate object for stream once the original is in the registry. */ | |
2058 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2059 | if (ret < 0) { | |
2060 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2061 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2062 | goto error; | |
2063 | } | |
2064 | ua_chan->handle = ua_chan->obj->handle; | |
2065 | ||
2066 | return 0; | |
2067 | ||
2068 | error: | |
2069 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2070 | error_fd_get: | |
2071 | return ret; | |
2072 | } | |
2073 | ||
2074 | /* | |
2075 | * For a given channel buffer registry, setup all streams of the given ust | |
2076 | * application channel. | |
2077 | * | |
2078 | * Return 0 on success or else a negative value. | |
2079 | */ | |
2080 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
2081 | struct ust_app_channel *ua_chan) | |
2082 | { | |
2083 | int ret = 0; | |
2084 | struct ust_app_stream *stream, *stmp; | |
2085 | ||
2086 | assert(reg_chan); | |
2087 | assert(ua_chan); | |
2088 | ||
2089 | DBG2("UST app setup buffer registry stream"); | |
2090 | ||
2091 | /* Send all streams to application. */ | |
2092 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2093 | struct buffer_reg_stream *reg_stream; | |
2094 | ||
2095 | ret = buffer_reg_stream_create(®_stream); | |
2096 | if (ret < 0) { | |
2097 | goto error; | |
2098 | } | |
2099 | ||
2100 | /* | |
2101 | * Keep original pointer and nullify it in the stream so the delete | |
2102 | * stream call does not release the object. | |
2103 | */ | |
2104 | reg_stream->obj.ust = stream->obj; | |
2105 | stream->obj = NULL; | |
2106 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2107 | |
7972aab2 DG |
2108 | /* We don't need the streams anymore. */ |
2109 | cds_list_del(&stream->list); | |
2110 | delete_ust_app_stream(-1, stream); | |
2111 | } | |
421cb601 | 2112 | |
7972aab2 DG |
2113 | error: |
2114 | return ret; | |
2115 | } | |
2116 | ||
2117 | /* | |
2118 | * Create a buffer registry channel for the given session registry and | |
2119 | * application channel object. If regp pointer is valid, it's set with the | |
2120 | * created object. Important, the created object is NOT added to the session | |
2121 | * registry hash table. | |
2122 | * | |
2123 | * Return 0 on success else a negative value. | |
2124 | */ | |
2125 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2126 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2127 | { | |
2128 | int ret; | |
2129 | struct buffer_reg_channel *reg_chan = NULL; | |
2130 | ||
2131 | assert(reg_sess); | |
2132 | assert(ua_chan); | |
2133 | ||
2134 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2135 | ||
2136 | /* Create buffer registry channel. */ | |
2137 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2138 | if (ret < 0) { | |
2139 | goto error_create; | |
421cb601 | 2140 | } |
7972aab2 DG |
2141 | assert(reg_chan); |
2142 | reg_chan->consumer_key = ua_chan->key; | |
8c924c7b | 2143 | reg_chan->subbuf_size = ua_chan->attr.subbuf_size; |
421cb601 | 2144 | |
7972aab2 DG |
2145 | /* Create and add a channel registry to session. */ |
2146 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2147 | ua_chan->tracing_channel_id); | |
2148 | if (ret < 0) { | |
2149 | goto error; | |
d88aee68 | 2150 | } |
7972aab2 | 2151 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2152 | |
7972aab2 DG |
2153 | if (regp) { |
2154 | *regp = reg_chan; | |
3d8ca23b | 2155 | } |
d88aee68 | 2156 | |
7972aab2 | 2157 | return 0; |
3d8ca23b DG |
2158 | |
2159 | error: | |
7972aab2 DG |
2160 | /* Safe because the registry channel object was not added to any HT. */ |
2161 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2162 | error_create: | |
3d8ca23b | 2163 | return ret; |
421cb601 DG |
2164 | } |
2165 | ||
55cc08a6 | 2166 | /* |
7972aab2 DG |
2167 | * Setup buffer registry channel for the given session registry and application |
2168 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2169 | * |
7972aab2 | 2170 | * Return 0 on success else a negative value. |
55cc08a6 | 2171 | */ |
7972aab2 DG |
2172 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
2173 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan) | |
55cc08a6 | 2174 | { |
7972aab2 | 2175 | int ret; |
55cc08a6 | 2176 | |
7972aab2 DG |
2177 | assert(reg_sess); |
2178 | assert(reg_chan); | |
2179 | assert(ua_chan); | |
2180 | assert(ua_chan->obj); | |
55cc08a6 | 2181 | |
7972aab2 | 2182 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2183 | |
7972aab2 DG |
2184 | /* Setup all streams for the registry. */ |
2185 | ret = setup_buffer_reg_streams(reg_chan, ua_chan); | |
2186 | if (ret < 0) { | |
55cc08a6 DG |
2187 | goto error; |
2188 | } | |
2189 | ||
7972aab2 DG |
2190 | reg_chan->obj.ust = ua_chan->obj; |
2191 | ua_chan->obj = NULL; | |
55cc08a6 | 2192 | |
7972aab2 | 2193 | return 0; |
55cc08a6 DG |
2194 | |
2195 | error: | |
7972aab2 DG |
2196 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2197 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2198 | return ret; |
2199 | } | |
2200 | ||
edb67388 | 2201 | /* |
7972aab2 | 2202 | * Send buffer registry channel to the application. |
d0b96690 | 2203 | * |
7972aab2 | 2204 | * Return 0 on success else a negative value. |
edb67388 | 2205 | */ |
7972aab2 DG |
2206 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2207 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2208 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2209 | { |
2210 | int ret; | |
7972aab2 | 2211 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2212 | |
7972aab2 DG |
2213 | assert(reg_chan); |
2214 | assert(app); | |
2215 | assert(ua_sess); | |
2216 | assert(ua_chan); | |
2217 | ||
2218 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2219 | ||
2220 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2221 | if (ret < 0) { |
2222 | goto error; | |
2223 | } | |
2224 | ||
7972aab2 DG |
2225 | /* Send channel to the application. */ |
2226 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
2227 | if (ret < 0) { | |
2228 | goto error; | |
2229 | } | |
2230 | ||
2231 | health_code_update(); | |
2232 | ||
2233 | /* Send all streams to application. */ | |
2234 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2235 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2236 | struct ust_app_stream stream; | |
2237 | ||
2238 | ret = duplicate_stream_object(reg_stream, &stream); | |
2239 | if (ret < 0) { | |
2240 | goto error_stream_unlock; | |
2241 | } | |
2242 | ||
2243 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2244 | if (ret < 0) { | |
8c067051 | 2245 | (void) release_ust_app_stream(-1, &stream); |
7972aab2 DG |
2246 | goto error_stream_unlock; |
2247 | } | |
edb67388 | 2248 | |
7972aab2 DG |
2249 | /* |
2250 | * The return value is not important here. This function will output an | |
2251 | * error if needed. | |
2252 | */ | |
2253 | (void) release_ust_app_stream(-1, &stream); | |
2254 | } | |
2255 | ua_chan->is_sent = 1; | |
2256 | ||
2257 | error_stream_unlock: | |
2258 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2259 | error: |
2260 | return ret; | |
2261 | } | |
2262 | ||
9730260e | 2263 | /* |
7972aab2 DG |
2264 | * Create and send to the application the created buffers with per UID buffers. |
2265 | * | |
2266 | * Return 0 on success else a negative value. | |
9730260e | 2267 | */ |
7972aab2 DG |
2268 | static int create_channel_per_uid(struct ust_app *app, |
2269 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2270 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2271 | { |
2272 | int ret; | |
7972aab2 DG |
2273 | struct buffer_reg_uid *reg_uid; |
2274 | struct buffer_reg_channel *reg_chan; | |
9730260e | 2275 | |
7972aab2 DG |
2276 | assert(app); |
2277 | assert(usess); | |
2278 | assert(ua_sess); | |
2279 | assert(ua_chan); | |
2280 | ||
2281 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2282 | ||
2283 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2284 | /* | |
2285 | * The session creation handles the creation of this global registry | |
2286 | * object. If none can be find, there is a code flow problem or a | |
2287 | * teardown race. | |
2288 | */ | |
2289 | assert(reg_uid); | |
2290 | ||
2291 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2292 | reg_uid); | |
2293 | if (!reg_chan) { | |
2294 | /* Create the buffer registry channel object. */ | |
2295 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2296 | if (ret < 0) { | |
2297 | goto error; | |
2298 | } | |
2299 | assert(reg_chan); | |
2300 | ||
2301 | /* | |
2302 | * Create the buffers on the consumer side. This call populates the | |
2303 | * ust app channel object with all streams and data object. | |
2304 | */ | |
2305 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2306 | app->bits_per_long, reg_uid->registry->reg.ust); | |
2307 | if (ret < 0) { | |
07d2ae95 DG |
2308 | /* |
2309 | * Let's remove the previously created buffer registry channel so | |
2310 | * it's not visible anymore in the session registry. | |
2311 | */ | |
2312 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, | |
2313 | ua_chan->tracing_channel_id); | |
2314 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
2315 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
7972aab2 DG |
2316 | goto error; |
2317 | } | |
2318 | ||
2319 | /* | |
2320 | * Setup the streams and add it to the session registry. | |
2321 | */ | |
2322 | ret = setup_buffer_reg_channel(reg_uid->registry, ua_chan, reg_chan); | |
2323 | if (ret < 0) { | |
2324 | goto error; | |
2325 | } | |
2326 | ||
2327 | } | |
2328 | ||
2329 | /* Send buffers to the application. */ | |
2330 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
9730260e DG |
2331 | if (ret < 0) { |
2332 | goto error; | |
2333 | } | |
2334 | ||
9730260e DG |
2335 | error: |
2336 | return ret; | |
2337 | } | |
2338 | ||
78f0bacd | 2339 | /* |
7972aab2 DG |
2340 | * Create and send to the application the created buffers with per PID buffers. |
2341 | * | |
2342 | * Return 0 on success else a negative value. | |
78f0bacd | 2343 | */ |
7972aab2 DG |
2344 | static int create_channel_per_pid(struct ust_app *app, |
2345 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2346 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2347 | { |
8535a6d9 | 2348 | int ret; |
7972aab2 | 2349 | struct ust_registry_session *registry; |
78f0bacd | 2350 | |
7972aab2 DG |
2351 | assert(app); |
2352 | assert(usess); | |
2353 | assert(ua_sess); | |
2354 | assert(ua_chan); | |
2355 | ||
2356 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2357 | ||
2358 | rcu_read_lock(); | |
2359 | ||
2360 | registry = get_session_registry(ua_sess); | |
2361 | assert(registry); | |
2362 | ||
2363 | /* Create and add a new channel registry to session. */ | |
2364 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd DG |
2365 | if (ret < 0) { |
2366 | goto error; | |
2367 | } | |
2368 | ||
7972aab2 DG |
2369 | /* Create and get channel on the consumer side. */ |
2370 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2371 | app->bits_per_long, registry); | |
2372 | if (ret < 0) { | |
2373 | goto error; | |
2374 | } | |
2375 | ||
2376 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
2377 | if (ret < 0) { | |
2378 | goto error; | |
2379 | } | |
8535a6d9 | 2380 | |
78f0bacd | 2381 | error: |
7972aab2 | 2382 | rcu_read_unlock(); |
78f0bacd DG |
2383 | return ret; |
2384 | } | |
2385 | ||
2386 | /* | |
7972aab2 DG |
2387 | * From an already allocated ust app channel, create the channel buffers if |
2388 | * need and send it to the application. This MUST be called with a RCU read | |
2389 | * side lock acquired. | |
2390 | * | |
2391 | * Return 0 on success or else a negative value. | |
78f0bacd | 2392 | */ |
7972aab2 DG |
2393 | static int do_create_channel(struct ust_app *app, |
2394 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2395 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2396 | { |
7972aab2 | 2397 | int ret; |
78f0bacd | 2398 | |
7972aab2 DG |
2399 | assert(app); |
2400 | assert(usess); | |
2401 | assert(ua_sess); | |
2402 | assert(ua_chan); | |
2403 | ||
2404 | /* Handle buffer type before sending the channel to the application. */ | |
2405 | switch (usess->buffer_type) { | |
2406 | case LTTNG_BUFFER_PER_UID: | |
2407 | { | |
2408 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
2409 | if (ret < 0) { | |
2410 | goto error; | |
2411 | } | |
2412 | break; | |
2413 | } | |
2414 | case LTTNG_BUFFER_PER_PID: | |
2415 | { | |
2416 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
2417 | if (ret < 0) { | |
2418 | goto error; | |
2419 | } | |
2420 | break; | |
2421 | } | |
2422 | default: | |
2423 | assert(0); | |
2424 | ret = -EINVAL; | |
78f0bacd DG |
2425 | goto error; |
2426 | } | |
2427 | ||
7972aab2 DG |
2428 | /* Initialize ust objd object using the received handle and add it. */ |
2429 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
2430 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 2431 | |
7972aab2 DG |
2432 | /* If channel is not enabled, disable it on the tracer */ |
2433 | if (!ua_chan->enabled) { | |
2434 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2435 | if (ret < 0) { | |
2436 | goto error; | |
2437 | } | |
78f0bacd DG |
2438 | } |
2439 | ||
2440 | error: | |
2441 | return ret; | |
2442 | } | |
2443 | ||
284d8f55 | 2444 | /* |
4d710ac2 DG |
2445 | * Create UST app channel and create it on the tracer. Set ua_chanp of the |
2446 | * newly created channel if not NULL. | |
d0b96690 | 2447 | * |
36b588ed | 2448 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 DG |
2449 | * |
2450 | * Return 0 on success or else a negative value. | |
284d8f55 | 2451 | */ |
4d710ac2 DG |
2452 | static int create_ust_app_channel(struct ust_app_session *ua_sess, |
2453 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
7972aab2 | 2454 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 2455 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
2456 | { |
2457 | int ret = 0; | |
bec39940 DG |
2458 | struct lttng_ht_iter iter; |
2459 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
2460 | struct ust_app_channel *ua_chan; |
2461 | ||
2462 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
2463 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
2464 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 2465 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 2466 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 2467 | goto end; |
5b4a0ec0 DG |
2468 | } |
2469 | ||
d0b96690 | 2470 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
2471 | if (ua_chan == NULL) { |
2472 | /* Only malloc can fail here */ | |
4d710ac2 | 2473 | ret = -ENOMEM; |
094d1690 | 2474 | goto error_alloc; |
fc34caaa DG |
2475 | } |
2476 | shadow_copy_channel(ua_chan, uchan); | |
2477 | ||
ffe60014 DG |
2478 | /* Set channel type. */ |
2479 | ua_chan->attr.type = type; | |
2480 | ||
7972aab2 | 2481 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
5b4a0ec0 DG |
2482 | if (ret < 0) { |
2483 | goto error; | |
2484 | } | |
2485 | ||
fc34caaa | 2486 | DBG2("UST app create channel %s for PID %d completed", ua_chan->name, |
852d0037 | 2487 | app->pid); |
fc34caaa | 2488 | |
d0b96690 DG |
2489 | /* Only add the channel if successful on the tracer side. */ |
2490 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
2491 | ||
fc34caaa | 2492 | end: |
4d710ac2 DG |
2493 | if (ua_chanp) { |
2494 | *ua_chanp = ua_chan; | |
2495 | } | |
2496 | ||
2497 | /* Everything went well. */ | |
2498 | return 0; | |
5b4a0ec0 DG |
2499 | |
2500 | error: | |
d0b96690 | 2501 | delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app); |
094d1690 | 2502 | error_alloc: |
4d710ac2 | 2503 | return ret; |
5b4a0ec0 DG |
2504 | } |
2505 | ||
2506 | /* | |
2507 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
2508 | * |
2509 | * Called with ust app session mutex held. | |
5b4a0ec0 | 2510 | */ |
edb67388 DG |
2511 | static |
2512 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
2513 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
2514 | struct ust_app *app) | |
284d8f55 | 2515 | { |
edb67388 | 2516 | int ret = 0; |
5b4a0ec0 | 2517 | struct ust_app_event *ua_event; |
284d8f55 | 2518 | |
5b4a0ec0 | 2519 | /* Get event node */ |
18eace3b DG |
2520 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
2521 | uevent->filter, uevent->attr.loglevel); | |
2522 | if (ua_event != NULL) { | |
fc34caaa | 2523 | ret = -EEXIST; |
edb67388 DG |
2524 | goto end; |
2525 | } | |
5b4a0ec0 | 2526 | |
edb67388 DG |
2527 | /* Does not exist so create one */ |
2528 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); | |
2529 | if (ua_event == NULL) { | |
2530 | /* Only malloc can failed so something is really wrong */ | |
2531 | ret = -ENOMEM; | |
fc34caaa | 2532 | goto end; |
5b4a0ec0 | 2533 | } |
edb67388 | 2534 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 2535 | |
edb67388 | 2536 | /* Create it on the tracer side */ |
5b4a0ec0 | 2537 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 2538 | if (ret < 0) { |
fc34caaa | 2539 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 2540 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
2541 | goto error; |
2542 | } | |
2543 | ||
d0b96690 | 2544 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 2545 | |
fc34caaa | 2546 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 2547 | app->pid); |
7f79d3a1 | 2548 | |
edb67388 | 2549 | end: |
fc34caaa DG |
2550 | return ret; |
2551 | ||
5b4a0ec0 | 2552 | error: |
fc34caaa DG |
2553 | /* Valid. Calling here is already in a read side lock */ |
2554 | delete_ust_app_event(-1, ua_event); | |
edb67388 | 2555 | return ret; |
5b4a0ec0 DG |
2556 | } |
2557 | ||
2558 | /* | |
2559 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 2560 | * |
7972aab2 | 2561 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
2562 | */ |
2563 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
d65d2de8 DG |
2564 | struct ust_app *app, struct consumer_output *consumer, |
2565 | struct ustctl_consumer_channel_attr *attr) | |
5b4a0ec0 DG |
2566 | { |
2567 | int ret = 0; | |
ffe60014 | 2568 | struct ust_app_channel *metadata; |
d88aee68 | 2569 | struct consumer_socket *socket; |
7972aab2 | 2570 | struct ust_registry_session *registry; |
5b4a0ec0 | 2571 | |
ffe60014 DG |
2572 | assert(ua_sess); |
2573 | assert(app); | |
d88aee68 | 2574 | assert(consumer); |
5b4a0ec0 | 2575 | |
7972aab2 DG |
2576 | registry = get_session_registry(ua_sess); |
2577 | assert(registry); | |
2578 | ||
1b532a60 DG |
2579 | /* Metadata already exists for this registry or it was closed previously */ |
2580 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
2581 | ret = 0; |
2582 | goto error; | |
5b4a0ec0 DG |
2583 | } |
2584 | ||
ffe60014 | 2585 | /* Allocate UST metadata */ |
d0b96690 | 2586 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
2587 | if (!metadata) { |
2588 | /* malloc() failed */ | |
2589 | ret = -ENOMEM; | |
2590 | goto error; | |
2591 | } | |
5b4a0ec0 | 2592 | |
d65d2de8 DG |
2593 | if (!attr) { |
2594 | /* Set default attributes for metadata. */ | |
2595 | metadata->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
2596 | metadata->attr.subbuf_size = default_get_metadata_subbuf_size(); | |
2597 | metadata->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM; | |
0a9c6494 DG |
2598 | metadata->attr.switch_timer_interval = DEFAULT_METADATA_SWITCH_TIMER; |
2599 | metadata->attr.read_timer_interval = DEFAULT_METADATA_READ_TIMER; | |
d65d2de8 DG |
2600 | metadata->attr.output = LTTNG_UST_MMAP; |
2601 | metadata->attr.type = LTTNG_UST_CHAN_METADATA; | |
2602 | } else { | |
2603 | memcpy(&metadata->attr, attr, sizeof(metadata->attr)); | |
2604 | metadata->attr.output = LTTNG_UST_MMAP; | |
2605 | metadata->attr.type = LTTNG_UST_CHAN_METADATA; | |
2606 | } | |
5b4a0ec0 | 2607 | |
7972aab2 DG |
2608 | /* Need one fd for the channel. */ |
2609 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2610 | if (ret < 0) { | |
2611 | ERR("Exhausted number of available FD upon create metadata"); | |
2612 | goto error; | |
2613 | } | |
2614 | ||
4dc3dfc5 DG |
2615 | /* Get the right consumer socket for the application. */ |
2616 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
2617 | if (!socket) { | |
2618 | ret = -EINVAL; | |
2619 | goto error_consumer; | |
2620 | } | |
2621 | ||
331744e3 JD |
2622 | /* |
2623 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
2624 | * to the registry *before* we ask the consumer so we avoid the race of the | |
2625 | * consumer requesting the metadata and the ask_channel call on our side | |
2626 | * did not returned yet. | |
2627 | */ | |
2628 | registry->metadata_key = metadata->key; | |
2629 | ||
d88aee68 DG |
2630 | /* |
2631 | * Ask the metadata channel creation to the consumer. The metadata object | |
2632 | * will be created by the consumer and kept their. However, the stream is | |
2633 | * never added or monitored until we do a first push metadata to the | |
2634 | * consumer. | |
2635 | */ | |
7972aab2 DG |
2636 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
2637 | registry); | |
d88aee68 | 2638 | if (ret < 0) { |
f2a444f1 DG |
2639 | /* Nullify the metadata key so we don't try to close it later on. */ |
2640 | registry->metadata_key = 0; | |
d88aee68 DG |
2641 | goto error_consumer; |
2642 | } | |
2643 | ||
2644 | /* | |
2645 | * The setup command will make the metadata stream be sent to the relayd, | |
2646 | * if applicable, and the thread managing the metadatas. This is important | |
2647 | * because after this point, if an error occurs, the only way the stream | |
2648 | * can be deleted is to be monitored in the consumer. | |
2649 | */ | |
7972aab2 | 2650 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 2651 | if (ret < 0) { |
f2a444f1 DG |
2652 | /* Nullify the metadata key so we don't try to close it later on. */ |
2653 | registry->metadata_key = 0; | |
d88aee68 | 2654 | goto error_consumer; |
5b4a0ec0 DG |
2655 | } |
2656 | ||
7972aab2 DG |
2657 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
2658 | metadata->key, app->pid); | |
5b4a0ec0 | 2659 | |
d88aee68 | 2660 | error_consumer: |
b80f0b6c | 2661 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 2662 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 2663 | error: |
ffe60014 | 2664 | return ret; |
5b4a0ec0 DG |
2665 | } |
2666 | ||
2667 | /* | |
2668 | * Return pointer to traceable apps list. | |
2669 | */ | |
bec39940 | 2670 | struct lttng_ht *ust_app_get_ht(void) |
5b4a0ec0 DG |
2671 | { |
2672 | return ust_app_ht; | |
2673 | } | |
2674 | ||
2675 | /* | |
d88aee68 DG |
2676 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
2677 | * acquired before calling this function. | |
5b4a0ec0 DG |
2678 | */ |
2679 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
2680 | { | |
d88aee68 | 2681 | struct ust_app *app = NULL; |
bec39940 DG |
2682 | struct lttng_ht_node_ulong *node; |
2683 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 2684 | |
bec39940 DG |
2685 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
2686 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
2687 | if (node == NULL) { |
2688 | DBG2("UST app no found with pid %d", pid); | |
2689 | goto error; | |
2690 | } | |
5b4a0ec0 DG |
2691 | |
2692 | DBG2("Found UST app by pid %d", pid); | |
2693 | ||
d88aee68 | 2694 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
2695 | |
2696 | error: | |
d88aee68 | 2697 | return app; |
5b4a0ec0 DG |
2698 | } |
2699 | ||
d88aee68 DG |
2700 | /* |
2701 | * Allocate and init an UST app object using the registration information and | |
2702 | * the command socket. This is called when the command socket connects to the | |
2703 | * session daemon. | |
2704 | * | |
2705 | * The object is returned on success or else NULL. | |
2706 | */ | |
d0b96690 | 2707 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 2708 | { |
d0b96690 DG |
2709 | struct ust_app *lta = NULL; |
2710 | ||
2711 | assert(msg); | |
2712 | assert(sock >= 0); | |
2713 | ||
2714 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 2715 | |
173af62f DG |
2716 | if ((msg->bits_per_long == 64 && |
2717 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
2718 | || (msg->bits_per_long == 32 && | |
2719 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 2720 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
2721 | "%d-bit long, but no consumerd for this size is available.\n", |
2722 | msg->name, msg->pid, msg->bits_per_long); | |
2723 | goto error; | |
3f2c5fcc | 2724 | } |
d0b96690 | 2725 | |
5b4a0ec0 DG |
2726 | lta = zmalloc(sizeof(struct ust_app)); |
2727 | if (lta == NULL) { | |
2728 | PERROR("malloc"); | |
d0b96690 | 2729 | goto error; |
5b4a0ec0 DG |
2730 | } |
2731 | ||
2732 | lta->ppid = msg->ppid; | |
2733 | lta->uid = msg->uid; | |
2734 | lta->gid = msg->gid; | |
d0b96690 | 2735 | |
7753dea8 | 2736 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
2737 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
2738 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
2739 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
2740 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
2741 | lta->long_alignment = msg->long_alignment; | |
2742 | lta->byte_order = msg->byte_order; | |
2743 | ||
5b4a0ec0 DG |
2744 | lta->v_major = msg->major; |
2745 | lta->v_minor = msg->minor; | |
d9bf3ca4 | 2746 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 DG |
2747 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
2748 | lta->notify_sock = -1; | |
d88aee68 DG |
2749 | |
2750 | /* Copy name and make sure it's NULL terminated. */ | |
2751 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
2752 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
2753 | ||
2754 | /* | |
2755 | * Before this can be called, when receiving the registration information, | |
2756 | * the application compatibility is checked. So, at this point, the | |
2757 | * application can work with this session daemon. | |
2758 | */ | |
d0b96690 | 2759 | lta->compatible = 1; |
5b4a0ec0 | 2760 | |
852d0037 | 2761 | lta->pid = msg->pid; |
d0b96690 | 2762 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 2763 | lta->sock = sock; |
d0b96690 | 2764 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 2765 | |
d42f20df DG |
2766 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
2767 | ||
d0b96690 DG |
2768 | error: |
2769 | return lta; | |
2770 | } | |
2771 | ||
d88aee68 DG |
2772 | /* |
2773 | * For a given application object, add it to every hash table. | |
2774 | */ | |
d0b96690 DG |
2775 | void ust_app_add(struct ust_app *app) |
2776 | { | |
2777 | assert(app); | |
2778 | assert(app->notify_sock >= 0); | |
2779 | ||
5b4a0ec0 | 2780 | rcu_read_lock(); |
852d0037 DG |
2781 | |
2782 | /* | |
2783 | * On a re-registration, we want to kick out the previous registration of | |
2784 | * that pid | |
2785 | */ | |
d0b96690 | 2786 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
2787 | |
2788 | /* | |
2789 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
2790 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
2791 | * already in the table. | |
2792 | */ | |
d0b96690 | 2793 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 2794 | |
d0b96690 DG |
2795 | /* Add application to the notify socket hash table. */ |
2796 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
2797 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 2798 | |
d0b96690 | 2799 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
2800 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
2801 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
2802 | app->v_minor); | |
5b4a0ec0 | 2803 | |
d0b96690 DG |
2804 | rcu_read_unlock(); |
2805 | } | |
2806 | ||
d88aee68 DG |
2807 | /* |
2808 | * Set the application version into the object. | |
2809 | * | |
2810 | * Return 0 on success else a negative value either an errno code or a | |
2811 | * LTTng-UST error code. | |
2812 | */ | |
d0b96690 DG |
2813 | int ust_app_version(struct ust_app *app) |
2814 | { | |
d88aee68 DG |
2815 | int ret; |
2816 | ||
d0b96690 | 2817 | assert(app); |
d88aee68 DG |
2818 | |
2819 | ret = ustctl_tracer_version(app->sock, &app->version); | |
2820 | if (ret < 0) { | |
2821 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
2822 | ERR("UST app %d verson failed with ret %d", app->sock, ret); | |
2823 | } else { | |
2824 | DBG3("UST app %d verion failed. Application is dead", app->sock); | |
2825 | } | |
2826 | } | |
2827 | ||
2828 | return ret; | |
5b4a0ec0 DG |
2829 | } |
2830 | ||
2831 | /* | |
2832 | * Unregister app by removing it from the global traceable app list and freeing | |
2833 | * the data struct. | |
2834 | * | |
2835 | * The socket is already closed at this point so no close to sock. | |
2836 | */ | |
2837 | void ust_app_unregister(int sock) | |
2838 | { | |
2839 | struct ust_app *lta; | |
bec39940 DG |
2840 | struct lttng_ht_node_ulong *node; |
2841 | struct lttng_ht_iter iter; | |
d42f20df | 2842 | struct ust_app_session *ua_sess; |
525b0740 | 2843 | int ret; |
5b4a0ec0 DG |
2844 | |
2845 | rcu_read_lock(); | |
886459c6 | 2846 | |
5b4a0ec0 | 2847 | /* Get the node reference for a call_rcu */ |
852d0037 | 2848 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 2849 | node = lttng_ht_iter_get_node_ulong(&iter); |
d0b96690 | 2850 | assert(node); |
284d8f55 | 2851 | |
852d0037 | 2852 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
2853 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
2854 | ||
886459c6 | 2855 | /* Remove application from PID hash table */ |
852d0037 DG |
2856 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
2857 | assert(!ret); | |
2858 | ||
d88aee68 DG |
2859 | /* |
2860 | * Remove application from notify hash table. The thread handling the | |
2861 | * notify socket could have deleted the node so ignore on error because | |
2862 | * either way it's valid. The close of that socket is handled by the other | |
2863 | * thread. | |
2864 | */ | |
d0b96690 | 2865 | iter.iter.node = <a->notify_sock_n.node; |
d88aee68 | 2866 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); |
852d0037 | 2867 | |
5b98a774 DG |
2868 | /* |
2869 | * Ignore return value since the node might have been removed before by an | |
2870 | * add replace during app registration because the PID can be reassigned by | |
2871 | * the OS. | |
2872 | */ | |
d0b96690 | 2873 | iter.iter.node = <a->pid_n.node; |
bec39940 | 2874 | ret = lttng_ht_del(ust_app_ht, &iter); |
5b98a774 DG |
2875 | if (ret) { |
2876 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
2877 | lta->pid); | |
2878 | } | |
852d0037 | 2879 | |
d42f20df DG |
2880 | /* Remove sessions so they are not visible during deletion.*/ |
2881 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, | |
2882 | node.node) { | |
7972aab2 DG |
2883 | struct ust_registry_session *registry; |
2884 | ||
d42f20df DG |
2885 | ret = lttng_ht_del(lta->sessions, &iter); |
2886 | if (ret) { | |
2887 | /* The session was already removed so scheduled for teardown. */ | |
2888 | continue; | |
2889 | } | |
2890 | ||
2891 | /* | |
2892 | * Add session to list for teardown. This is safe since at this point we | |
2893 | * are the only one using this list. | |
2894 | */ | |
d88aee68 DG |
2895 | pthread_mutex_lock(&ua_sess->lock); |
2896 | ||
2897 | /* | |
2898 | * Normally, this is done in the delete session process which is | |
2899 | * executed in the call rcu below. However, upon registration we can't | |
2900 | * afford to wait for the grace period before pushing data or else the | |
2901 | * data pending feature can race between the unregistration and stop | |
2902 | * command where the data pending command is sent *before* the grace | |
2903 | * period ended. | |
2904 | * | |
2905 | * The close metadata below nullifies the metadata pointer in the | |
2906 | * session so the delete session will NOT push/close a second time. | |
2907 | */ | |
7972aab2 | 2908 | registry = get_session_registry(ua_sess); |
1b532a60 | 2909 | if (registry && !registry->metadata_closed) { |
7972aab2 DG |
2910 | /* Push metadata for application before freeing the application. */ |
2911 | (void) push_metadata(registry, ua_sess->consumer); | |
2912 | ||
2913 | /* | |
2914 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
2915 | * metadata only on destroy trace session in this case. Also, the |
2916 | * previous push metadata could have flag the metadata registry to | |
2917 | * close so don't send a close command if closed. | |
7972aab2 | 2918 | */ |
1b532a60 DG |
2919 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID && |
2920 | !registry->metadata_closed) { | |
7972aab2 DG |
2921 | /* And ask to close it for this session registry. */ |
2922 | (void) close_metadata(registry, ua_sess->consumer); | |
2923 | } | |
2924 | } | |
d88aee68 | 2925 | |
d42f20df | 2926 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
d88aee68 | 2927 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
2928 | } |
2929 | ||
852d0037 DG |
2930 | /* Free memory */ |
2931 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
2932 | ||
5b4a0ec0 DG |
2933 | rcu_read_unlock(); |
2934 | return; | |
284d8f55 DG |
2935 | } |
2936 | ||
2937 | /* | |
5b4a0ec0 | 2938 | * Return traceable_app_count |
284d8f55 | 2939 | */ |
5b4a0ec0 | 2940 | unsigned long ust_app_list_count(void) |
284d8f55 | 2941 | { |
5b4a0ec0 | 2942 | unsigned long count; |
284d8f55 | 2943 | |
5b4a0ec0 | 2944 | rcu_read_lock(); |
bec39940 | 2945 | count = lttng_ht_get_count(ust_app_ht); |
5b4a0ec0 | 2946 | rcu_read_unlock(); |
284d8f55 | 2947 | |
5b4a0ec0 | 2948 | return count; |
284d8f55 DG |
2949 | } |
2950 | ||
5b4a0ec0 DG |
2951 | /* |
2952 | * Fill events array with all events name of all registered apps. | |
2953 | */ | |
2954 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 2955 | { |
5b4a0ec0 DG |
2956 | int ret, handle; |
2957 | size_t nbmem, count = 0; | |
bec39940 | 2958 | struct lttng_ht_iter iter; |
5b4a0ec0 | 2959 | struct ust_app *app; |
c617c0c6 | 2960 | struct lttng_event *tmp_event; |
421cb601 | 2961 | |
5b4a0ec0 | 2962 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
2963 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
2964 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
2965 | PERROR("zmalloc ust app events"); |
2966 | ret = -ENOMEM; | |
421cb601 DG |
2967 | goto error; |
2968 | } | |
2969 | ||
5b4a0ec0 | 2970 | rcu_read_lock(); |
421cb601 | 2971 | |
852d0037 | 2972 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 2973 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 2974 | |
840cb59c | 2975 | health_code_update(); |
86acf0da | 2976 | |
e0c7ec2b DG |
2977 | if (!app->compatible) { |
2978 | /* | |
2979 | * TODO: In time, we should notice the caller of this error by | |
2980 | * telling him that this is a version error. | |
2981 | */ | |
2982 | continue; | |
2983 | } | |
852d0037 | 2984 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 2985 | if (handle < 0) { |
ffe60014 DG |
2986 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
2987 | ERR("UST app list events getting handle failed for app pid %d", | |
2988 | app->pid); | |
2989 | } | |
5b4a0ec0 DG |
2990 | continue; |
2991 | } | |
421cb601 | 2992 | |
852d0037 | 2993 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 2994 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
2995 | /* Handle ustctl error. */ |
2996 | if (ret < 0) { | |
2997 | free(tmp_event); | |
2998 | if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) { | |
2999 | ERR("UST app tp list get failed for app %d with ret %d", | |
3000 | app->sock, ret); | |
3001 | } else { | |
3002 | DBG3("UST app tp list get failed. Application is dead"); | |
3003 | } | |
3004 | goto rcu_error; | |
3005 | } | |
3006 | ||
840cb59c | 3007 | health_code_update(); |
815564d8 | 3008 | if (count >= nbmem) { |
d7b3776f | 3009 | /* In case the realloc fails, we free the memory */ |
c617c0c6 MD |
3010 | void *ptr; |
3011 | ||
815564d8 MD |
3012 | DBG2("Reallocating event list from %zu to %zu entries", nbmem, |
3013 | 2 * nbmem); | |
3014 | nbmem *= 2; | |
c617c0c6 MD |
3015 | ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event)); |
3016 | if (ptr == NULL) { | |
5b4a0ec0 | 3017 | PERROR("realloc ust app events"); |
c617c0c6 | 3018 | free(tmp_event); |
5b4a0ec0 DG |
3019 | ret = -ENOMEM; |
3020 | goto rcu_error; | |
3021 | } | |
c617c0c6 | 3022 | tmp_event = ptr; |
5b4a0ec0 | 3023 | } |
c617c0c6 MD |
3024 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
3025 | tmp_event[count].loglevel = uiter.loglevel; | |
3026 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
3027 | tmp_event[count].pid = app->pid; | |
3028 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 3029 | count++; |
421cb601 | 3030 | } |
421cb601 DG |
3031 | } |
3032 | ||
5b4a0ec0 | 3033 | ret = count; |
c617c0c6 | 3034 | *events = tmp_event; |
421cb601 | 3035 | |
5b4a0ec0 | 3036 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 3037 | |
5b4a0ec0 DG |
3038 | rcu_error: |
3039 | rcu_read_unlock(); | |
421cb601 | 3040 | error: |
840cb59c | 3041 | health_code_update(); |
5b4a0ec0 | 3042 | return ret; |
421cb601 DG |
3043 | } |
3044 | ||
f37d259d MD |
3045 | /* |
3046 | * Fill events array with all events name of all registered apps. | |
3047 | */ | |
3048 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
3049 | { | |
3050 | int ret, handle; | |
3051 | size_t nbmem, count = 0; | |
3052 | struct lttng_ht_iter iter; | |
3053 | struct ust_app *app; | |
c617c0c6 | 3054 | struct lttng_event_field *tmp_event; |
f37d259d MD |
3055 | |
3056 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
3057 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
3058 | if (tmp_event == NULL) { | |
f37d259d MD |
3059 | PERROR("zmalloc ust app event fields"); |
3060 | ret = -ENOMEM; | |
3061 | goto error; | |
3062 | } | |
3063 | ||
3064 | rcu_read_lock(); | |
3065 | ||
3066 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3067 | struct lttng_ust_field_iter uiter; | |
3068 | ||
840cb59c | 3069 | health_code_update(); |
86acf0da | 3070 | |
f37d259d MD |
3071 | if (!app->compatible) { |
3072 | /* | |
3073 | * TODO: In time, we should notice the caller of this error by | |
3074 | * telling him that this is a version error. | |
3075 | */ | |
3076 | continue; | |
3077 | } | |
3078 | handle = ustctl_tracepoint_field_list(app->sock); | |
3079 | if (handle < 0) { | |
ffe60014 DG |
3080 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3081 | ERR("UST app list field getting handle failed for app pid %d", | |
3082 | app->pid); | |
3083 | } | |
f37d259d MD |
3084 | continue; |
3085 | } | |
3086 | ||
3087 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 3088 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3089 | /* Handle ustctl error. */ |
3090 | if (ret < 0) { | |
3091 | free(tmp_event); | |
3092 | if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) { | |
3093 | ERR("UST app tp list field failed for app %d with ret %d", | |
3094 | app->sock, ret); | |
3095 | } else { | |
3096 | DBG3("UST app tp list field failed. Application is dead"); | |
3097 | } | |
3098 | goto rcu_error; | |
3099 | } | |
3100 | ||
840cb59c | 3101 | health_code_update(); |
f37d259d | 3102 | if (count >= nbmem) { |
d7b3776f | 3103 | /* In case the realloc fails, we free the memory */ |
c617c0c6 MD |
3104 | void *ptr; |
3105 | ||
f37d259d MD |
3106 | DBG2("Reallocating event field list from %zu to %zu entries", nbmem, |
3107 | 2 * nbmem); | |
3108 | nbmem *= 2; | |
c617c0c6 MD |
3109 | ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event_field)); |
3110 | if (ptr == NULL) { | |
f37d259d | 3111 | PERROR("realloc ust app event fields"); |
c617c0c6 | 3112 | free(tmp_event); |
f37d259d MD |
3113 | ret = -ENOMEM; |
3114 | goto rcu_error; | |
3115 | } | |
c617c0c6 | 3116 | tmp_event = ptr; |
f37d259d | 3117 | } |
f37d259d | 3118 | |
c617c0c6 MD |
3119 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
3120 | tmp_event[count].type = uiter.type; | |
3121 | tmp_event[count].nowrite = uiter.nowrite; | |
f37d259d | 3122 | |
c617c0c6 MD |
3123 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
3124 | tmp_event[count].event.loglevel = uiter.loglevel; | |
3125 | tmp_event[count].event.type = LTTNG_UST_TRACEPOINT; | |
3126 | tmp_event[count].event.pid = app->pid; | |
3127 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
3128 | count++; |
3129 | } | |
3130 | } | |
3131 | ||
3132 | ret = count; | |
c617c0c6 | 3133 | *fields = tmp_event; |
f37d259d MD |
3134 | |
3135 | DBG2("UST app list event fields done (%zu events)", count); | |
3136 | ||
3137 | rcu_error: | |
3138 | rcu_read_unlock(); | |
3139 | error: | |
840cb59c | 3140 | health_code_update(); |
f37d259d MD |
3141 | return ret; |
3142 | } | |
3143 | ||
5b4a0ec0 DG |
3144 | /* |
3145 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
3146 | * |
3147 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
3148 | */ |
3149 | void ust_app_clean_list(void) | |
421cb601 | 3150 | { |
5b4a0ec0 | 3151 | int ret; |
659ed79f | 3152 | struct ust_app *app; |
bec39940 | 3153 | struct lttng_ht_iter iter; |
421cb601 | 3154 | |
5b4a0ec0 | 3155 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3156 | |
5b4a0ec0 | 3157 | rcu_read_lock(); |
421cb601 | 3158 | |
659ed79f | 3159 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3160 | ret = lttng_ht_del(ust_app_ht, &iter); |
525b0740 | 3161 | assert(!ret); |
659ed79f | 3162 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); |
421cb601 DG |
3163 | } |
3164 | ||
852d0037 | 3165 | /* Cleanup socket hash table */ |
659ed79f DG |
3166 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, |
3167 | sock_n.node) { | |
852d0037 | 3168 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
bec39940 DG |
3169 | assert(!ret); |
3170 | } | |
852d0037 | 3171 | |
d88aee68 DG |
3172 | /* Cleanup notify socket hash table */ |
3173 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3174 | notify_sock_n.node) { | |
3175 | ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3176 | assert(!ret); | |
3177 | } | |
36b588ed | 3178 | rcu_read_unlock(); |
d88aee68 | 3179 | |
bec39940 | 3180 | /* Destroy is done only when the ht is empty */ |
0b2dc8df MD |
3181 | ht_cleanup_push(ust_app_ht); |
3182 | ht_cleanup_push(ust_app_ht_by_sock); | |
3183 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
5b4a0ec0 DG |
3184 | } |
3185 | ||
3186 | /* | |
3187 | * Init UST app hash table. | |
3188 | */ | |
3189 | void ust_app_ht_alloc(void) | |
3190 | { | |
bec39940 | 3191 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
852d0037 | 3192 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3193 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
421cb601 DG |
3194 | } |
3195 | ||
78f0bacd DG |
3196 | /* |
3197 | * For a specific UST session, disable the channel for all registered apps. | |
3198 | */ | |
35a9059d | 3199 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3200 | struct ltt_ust_channel *uchan) |
3201 | { | |
3202 | int ret = 0; | |
bec39940 DG |
3203 | struct lttng_ht_iter iter; |
3204 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3205 | struct ust_app *app; |
3206 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3207 | struct ust_app_channel *ua_chan; |
78f0bacd DG |
3208 | |
3209 | if (usess == NULL || uchan == NULL) { | |
3210 | ERR("Disabling UST global channel with NULL values"); | |
3211 | ret = -1; | |
3212 | goto error; | |
3213 | } | |
3214 | ||
d9bf3ca4 | 3215 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 3216 | uchan->name, usess->id); |
78f0bacd DG |
3217 | |
3218 | rcu_read_lock(); | |
3219 | ||
3220 | /* For every registered applications */ | |
852d0037 | 3221 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3222 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3223 | if (!app->compatible) { |
3224 | /* | |
3225 | * TODO: In time, we should notice the caller of this error by | |
3226 | * telling him that this is a version error. | |
3227 | */ | |
3228 | continue; | |
3229 | } | |
78f0bacd DG |
3230 | ua_sess = lookup_session_by_app(usess, app); |
3231 | if (ua_sess == NULL) { | |
3232 | continue; | |
3233 | } | |
3234 | ||
8535a6d9 | 3235 | /* Get channel */ |
bec39940 DG |
3236 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3237 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
3238 | /* If the session if found for the app, the channel must be there */ |
3239 | assert(ua_chan_node); | |
3240 | ||
3241 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3242 | /* The channel must not be already disabled */ | |
3243 | assert(ua_chan->enabled == 1); | |
3244 | ||
3245 | /* Disable channel onto application */ | |
3246 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
3247 | if (ret < 0) { |
3248 | /* XXX: We might want to report this error at some point... */ | |
3249 | continue; | |
3250 | } | |
3251 | } | |
3252 | ||
3253 | rcu_read_unlock(); | |
3254 | ||
3255 | error: | |
3256 | return ret; | |
3257 | } | |
3258 | ||
3259 | /* | |
3260 | * For a specific UST session, enable the channel for all registered apps. | |
3261 | */ | |
35a9059d | 3262 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3263 | struct ltt_ust_channel *uchan) |
3264 | { | |
3265 | int ret = 0; | |
bec39940 | 3266 | struct lttng_ht_iter iter; |
78f0bacd DG |
3267 | struct ust_app *app; |
3268 | struct ust_app_session *ua_sess; | |
3269 | ||
3270 | if (usess == NULL || uchan == NULL) { | |
3271 | ERR("Adding UST global channel to NULL values"); | |
3272 | ret = -1; | |
3273 | goto error; | |
3274 | } | |
3275 | ||
d9bf3ca4 | 3276 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 3277 | uchan->name, usess->id); |
78f0bacd DG |
3278 | |
3279 | rcu_read_lock(); | |
3280 | ||
3281 | /* For every registered applications */ | |
852d0037 | 3282 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3283 | if (!app->compatible) { |
3284 | /* | |
3285 | * TODO: In time, we should notice the caller of this error by | |
3286 | * telling him that this is a version error. | |
3287 | */ | |
3288 | continue; | |
3289 | } | |
78f0bacd DG |
3290 | ua_sess = lookup_session_by_app(usess, app); |
3291 | if (ua_sess == NULL) { | |
3292 | continue; | |
3293 | } | |
3294 | ||
3295 | /* Enable channel onto application */ | |
3296 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
3297 | if (ret < 0) { | |
3298 | /* XXX: We might want to report this error at some point... */ | |
3299 | continue; | |
3300 | } | |
3301 | } | |
3302 | ||
3303 | rcu_read_unlock(); | |
3304 | ||
3305 | error: | |
3306 | return ret; | |
3307 | } | |
3308 | ||
b0a40d28 DG |
3309 | /* |
3310 | * Disable an event in a channel and for a specific session. | |
3311 | */ | |
35a9059d DG |
3312 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
3313 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
3314 | { |
3315 | int ret = 0; | |
bec39940 DG |
3316 | struct lttng_ht_iter iter, uiter; |
3317 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
b0a40d28 DG |
3318 | struct ust_app *app; |
3319 | struct ust_app_session *ua_sess; | |
3320 | struct ust_app_channel *ua_chan; | |
3321 | struct ust_app_event *ua_event; | |
3322 | ||
3323 | DBG("UST app disabling event %s for all apps in channel " | |
d9bf3ca4 MD |
3324 | "%s for session id %" PRIu64, |
3325 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
3326 | |
3327 | rcu_read_lock(); | |
3328 | ||
3329 | /* For all registered applications */ | |
852d0037 | 3330 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3331 | if (!app->compatible) { |
3332 | /* | |
3333 | * TODO: In time, we should notice the caller of this error by | |
3334 | * telling him that this is a version error. | |
3335 | */ | |
3336 | continue; | |
3337 | } | |
b0a40d28 DG |
3338 | ua_sess = lookup_session_by_app(usess, app); |
3339 | if (ua_sess == NULL) { | |
3340 | /* Next app */ | |
3341 | continue; | |
3342 | } | |
3343 | ||
3344 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3345 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3346 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 3347 | if (ua_chan_node == NULL) { |
d9bf3ca4 | 3348 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 3349 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
3350 | continue; |
3351 | } | |
3352 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3353 | ||
bec39940 DG |
3354 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter); |
3355 | ua_event_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 DG |
3356 | if (ua_event_node == NULL) { |
3357 | DBG2("Event %s not found in channel %s for app pid %d." | |
852d0037 | 3358 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
3359 | continue; |
3360 | } | |
3361 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
3362 | ||
7f79d3a1 | 3363 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
3364 | if (ret < 0) { |
3365 | /* XXX: Report error someday... */ | |
3366 | continue; | |
3367 | } | |
3368 | } | |
3369 | ||
3370 | rcu_read_unlock(); | |
3371 | ||
3372 | return ret; | |
3373 | } | |
3374 | ||
9730260e | 3375 | /* |
edb67388 | 3376 | * For a specific UST session and UST channel, the event for all |
9730260e DG |
3377 | * registered apps. |
3378 | */ | |
35a9059d | 3379 | int ust_app_disable_all_event_glb(struct ltt_ust_session *usess, |
9730260e DG |
3380 | struct ltt_ust_channel *uchan) |
3381 | { | |
3382 | int ret = 0; | |
bec39940 DG |
3383 | struct lttng_ht_iter iter, uiter; |
3384 | struct lttng_ht_node_str *ua_chan_node; | |
9730260e DG |
3385 | struct ust_app *app; |
3386 | struct ust_app_session *ua_sess; | |
3387 | struct ust_app_channel *ua_chan; | |
3388 | struct ust_app_event *ua_event; | |
3389 | ||
3390 | DBG("UST app disabling all event for all apps in channel " | |
d9bf3ca4 | 3391 | "%s for session id %" PRIu64, uchan->name, usess->id); |
9730260e DG |
3392 | |
3393 | rcu_read_lock(); | |
3394 | ||
3395 | /* For all registered applications */ | |
852d0037 | 3396 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3397 | if (!app->compatible) { |
3398 | /* | |
3399 | * TODO: In time, we should notice the caller of this error by | |
3400 | * telling him that this is a version error. | |
3401 | */ | |
3402 | continue; | |
3403 | } | |
9730260e | 3404 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3405 | if (!ua_sess) { |
3406 | /* The application has problem or is probably dead. */ | |
3407 | continue; | |
3408 | } | |
9730260e DG |
3409 | |
3410 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3411 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3412 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3413 | /* If the channel is not found, there is a code flow error */ |
3414 | assert(ua_chan_node); | |
3415 | ||
9730260e DG |
3416 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3417 | ||
3418 | /* Disable each events of channel */ | |
bec39940 DG |
3419 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
3420 | node.node) { | |
7f79d3a1 | 3421 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
9730260e DG |
3422 | if (ret < 0) { |
3423 | /* XXX: Report error someday... */ | |
3424 | continue; | |
3425 | } | |
3426 | } | |
3427 | } | |
3428 | ||
3429 | rcu_read_unlock(); | |
3430 | ||
3431 | return ret; | |
3432 | } | |
3433 | ||
421cb601 | 3434 | /* |
5b4a0ec0 | 3435 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 3436 | */ |
35a9059d | 3437 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3438 | struct ltt_ust_channel *uchan) |
3439 | { | |
3d8ca23b | 3440 | int ret = 0, created; |
bec39940 | 3441 | struct lttng_ht_iter iter; |
48842b30 | 3442 | struct ust_app *app; |
3d8ca23b | 3443 | struct ust_app_session *ua_sess = NULL; |
48842b30 | 3444 | |
fc34caaa DG |
3445 | /* Very wrong code flow */ |
3446 | assert(usess); | |
3447 | assert(uchan); | |
421cb601 | 3448 | |
d9bf3ca4 | 3449 | DBG2("UST app adding channel %s to UST domain for session id %" PRIu64, |
a991f516 | 3450 | uchan->name, usess->id); |
48842b30 DG |
3451 | |
3452 | rcu_read_lock(); | |
421cb601 | 3453 | |
5b4a0ec0 | 3454 | /* For every registered applications */ |
852d0037 | 3455 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3456 | if (!app->compatible) { |
3457 | /* | |
3458 | * TODO: In time, we should notice the caller of this error by | |
3459 | * telling him that this is a version error. | |
3460 | */ | |
3461 | continue; | |
3462 | } | |
edb67388 DG |
3463 | /* |
3464 | * Create session on the tracer side and add it to app session HT. Note | |
3465 | * that if session exist, it will simply return a pointer to the ust | |
3466 | * app session. | |
3467 | */ | |
3d8ca23b DG |
3468 | ret = create_ust_app_session(usess, app, &ua_sess, &created); |
3469 | if (ret < 0) { | |
3470 | switch (ret) { | |
3471 | case -ENOTCONN: | |
3472 | /* | |
3473 | * The application's socket is not valid. Either a bad socket | |
3474 | * or a timeout on it. We can't inform the caller that for a | |
3475 | * specific app, the session failed so lets continue here. | |
3476 | */ | |
3477 | continue; | |
3478 | case -ENOMEM: | |
3479 | default: | |
3480 | goto error_rcu_unlock; | |
3481 | } | |
48842b30 | 3482 | } |
3d8ca23b | 3483 | assert(ua_sess); |
48842b30 | 3484 | |
d0b96690 | 3485 | pthread_mutex_lock(&ua_sess->lock); |
d65d2de8 DG |
3486 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, |
3487 | sizeof(uchan->name))) { | |
3488 | struct ustctl_consumer_channel_attr attr; | |
3489 | copy_channel_attr_to_ustctl(&attr, &uchan->attr); | |
3490 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, | |
3491 | &attr); | |
3492 | } else { | |
3493 | /* Create channel onto application. We don't need the chan ref. */ | |
3494 | ret = create_ust_app_channel(ua_sess, uchan, app, | |
3495 | LTTNG_UST_CHAN_PER_CPU, usess, NULL); | |
3496 | } | |
d0b96690 | 3497 | pthread_mutex_unlock(&ua_sess->lock); |
3d8ca23b DG |
3498 | if (ret < 0) { |
3499 | if (ret == -ENOMEM) { | |
3500 | /* No more memory is a fatal error. Stop right now. */ | |
3501 | goto error_rcu_unlock; | |
3502 | } | |
3503 | /* Cleanup the created session if it's the case. */ | |
3504 | if (created) { | |
d0b96690 | 3505 | destroy_app_session(app, ua_sess); |
3d8ca23b | 3506 | } |
48842b30 | 3507 | } |
48842b30 | 3508 | } |
5b4a0ec0 | 3509 | |
95e047ff | 3510 | error_rcu_unlock: |
48842b30 | 3511 | rcu_read_unlock(); |
3c14c33f | 3512 | return ret; |
48842b30 DG |
3513 | } |
3514 | ||
5b4a0ec0 | 3515 | /* |
edb67388 | 3516 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 3517 | */ |
35a9059d | 3518 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3519 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3520 | { | |
3521 | int ret = 0; | |
bec39940 | 3522 | struct lttng_ht_iter iter, uiter; |
18eace3b | 3523 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
3524 | struct ust_app *app; |
3525 | struct ust_app_session *ua_sess; | |
3526 | struct ust_app_channel *ua_chan; | |
3527 | struct ust_app_event *ua_event; | |
48842b30 | 3528 | |
d9bf3ca4 | 3529 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 3530 | uevent->attr.name, usess->id); |
48842b30 | 3531 | |
edb67388 DG |
3532 | /* |
3533 | * NOTE: At this point, this function is called only if the session and | |
3534 | * channel passed are already created for all apps. and enabled on the | |
3535 | * tracer also. | |
3536 | */ | |
3537 | ||
48842b30 | 3538 | rcu_read_lock(); |
421cb601 DG |
3539 | |
3540 | /* For all registered applications */ | |
852d0037 | 3541 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3542 | if (!app->compatible) { |
3543 | /* | |
3544 | * TODO: In time, we should notice the caller of this error by | |
3545 | * telling him that this is a version error. | |
3546 | */ | |
3547 | continue; | |
3548 | } | |
edb67388 | 3549 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3550 | if (!ua_sess) { |
3551 | /* The application has problem or is probably dead. */ | |
3552 | continue; | |
3553 | } | |
ba767faf | 3554 | |
d0b96690 DG |
3555 | pthread_mutex_lock(&ua_sess->lock); |
3556 | ||
edb67388 | 3557 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3558 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3559 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3560 | /* If the channel is not found, there is a code flow error */ |
3561 | assert(ua_chan_node); | |
3562 | ||
3563 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3564 | ||
18eace3b DG |
3565 | /* Get event node */ |
3566 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
3567 | uevent->filter, uevent->attr.loglevel); | |
3568 | if (ua_event == NULL) { | |
7f79d3a1 | 3569 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 3570 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 3571 | goto next_app; |
35a9059d | 3572 | } |
35a9059d DG |
3573 | |
3574 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
3575 | if (ret < 0) { | |
d0b96690 | 3576 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 3577 | goto error; |
48842b30 | 3578 | } |
d0b96690 DG |
3579 | next_app: |
3580 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
3581 | } |
3582 | ||
7f79d3a1 | 3583 | error: |
edb67388 | 3584 | rcu_read_unlock(); |
edb67388 DG |
3585 | return ret; |
3586 | } | |
3587 | ||
3588 | /* | |
3589 | * For a specific existing UST session and UST channel, creates the event for | |
3590 | * all registered apps. | |
3591 | */ | |
35a9059d | 3592 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
3593 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3594 | { | |
3595 | int ret = 0; | |
bec39940 DG |
3596 | struct lttng_ht_iter iter, uiter; |
3597 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
3598 | struct ust_app *app; |
3599 | struct ust_app_session *ua_sess; | |
3600 | struct ust_app_channel *ua_chan; | |
3601 | ||
d9bf3ca4 | 3602 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 3603 | uevent->attr.name, usess->id); |
edb67388 | 3604 | |
edb67388 DG |
3605 | rcu_read_lock(); |
3606 | ||
3607 | /* For all registered applications */ | |
852d0037 | 3608 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3609 | if (!app->compatible) { |
3610 | /* | |
3611 | * TODO: In time, we should notice the caller of this error by | |
3612 | * telling him that this is a version error. | |
3613 | */ | |
3614 | continue; | |
3615 | } | |
edb67388 | 3616 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3617 | if (!ua_sess) { |
3618 | /* The application has problem or is probably dead. */ | |
3619 | continue; | |
3620 | } | |
48842b30 | 3621 | |
d0b96690 | 3622 | pthread_mutex_lock(&ua_sess->lock); |
48842b30 | 3623 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3624 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3625 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3626 | /* If the channel is not found, there is a code flow error */ |
3627 | assert(ua_chan_node); | |
3628 | ||
48842b30 DG |
3629 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3630 | ||
edb67388 | 3631 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 3632 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 3633 | if (ret < 0) { |
49c336c1 | 3634 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
3635 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
3636 | break; | |
3637 | } | |
3638 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 3639 | uevent->attr.name, app->pid); |
5b4a0ec0 | 3640 | continue; |
48842b30 | 3641 | } |
48842b30 | 3642 | } |
5b4a0ec0 | 3643 | |
48842b30 DG |
3644 | rcu_read_unlock(); |
3645 | ||
3646 | return ret; | |
3647 | } | |
3648 | ||
5b4a0ec0 DG |
3649 | /* |
3650 | * Start tracing for a specific UST session and app. | |
3651 | */ | |
b34cbebf | 3652 | static |
421cb601 | 3653 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
3654 | { |
3655 | int ret = 0; | |
48842b30 | 3656 | struct ust_app_session *ua_sess; |
48842b30 | 3657 | |
852d0037 | 3658 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 3659 | |
509cbaf8 MD |
3660 | rcu_read_lock(); |
3661 | ||
e0c7ec2b DG |
3662 | if (!app->compatible) { |
3663 | goto end; | |
3664 | } | |
3665 | ||
421cb601 DG |
3666 | ua_sess = lookup_session_by_app(usess, app); |
3667 | if (ua_sess == NULL) { | |
d42f20df DG |
3668 | /* The session is in teardown process. Ignore and continue. */ |
3669 | goto end; | |
421cb601 | 3670 | } |
48842b30 | 3671 | |
d0b96690 DG |
3672 | pthread_mutex_lock(&ua_sess->lock); |
3673 | ||
aea829b3 DG |
3674 | /* Upon restart, we skip the setup, already done */ |
3675 | if (ua_sess->started) { | |
8be98f9a | 3676 | goto skip_setup; |
aea829b3 | 3677 | } |
8be98f9a | 3678 | |
a4b92340 DG |
3679 | /* Create directories if consumer is LOCAL and has a path defined. */ |
3680 | if (usess->consumer->type == CONSUMER_DST_LOCAL && | |
3681 | strlen(usess->consumer->dst.trace_path) > 0) { | |
3682 | ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path, | |
7972aab2 | 3683 | S_IRWXU | S_IRWXG, ua_sess->euid, ua_sess->egid); |
a4b92340 DG |
3684 | if (ret < 0) { |
3685 | if (ret != -EEXIST) { | |
3686 | ERR("Trace directory creation error"); | |
d0b96690 | 3687 | goto error_unlock; |
421cb601 | 3688 | } |
173af62f | 3689 | } |
7753dea8 | 3690 | } |
aea829b3 | 3691 | |
d65d2de8 DG |
3692 | /* |
3693 | * Create the metadata for the application. This returns gracefully if a | |
3694 | * metadata was already set for the session. | |
3695 | */ | |
3696 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, NULL); | |
421cb601 | 3697 | if (ret < 0) { |
d0b96690 | 3698 | goto error_unlock; |
421cb601 | 3699 | } |
48842b30 | 3700 | |
840cb59c | 3701 | health_code_update(); |
86acf0da | 3702 | |
8be98f9a | 3703 | skip_setup: |
421cb601 | 3704 | /* This start the UST tracing */ |
852d0037 | 3705 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
421cb601 | 3706 | if (ret < 0) { |
ffe60014 DG |
3707 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3708 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
3709 | app->pid, ret); | |
3710 | } else { | |
3711 | DBG("UST app start session failed. Application is dead."); | |
3712 | } | |
d0b96690 | 3713 | goto error_unlock; |
421cb601 | 3714 | } |
5b4a0ec0 | 3715 | |
55c3953d DG |
3716 | /* Indicate that the session has been started once */ |
3717 | ua_sess->started = 1; | |
3718 | ||
d0b96690 DG |
3719 | pthread_mutex_unlock(&ua_sess->lock); |
3720 | ||
840cb59c | 3721 | health_code_update(); |
86acf0da | 3722 | |
421cb601 | 3723 | /* Quiescent wait after starting trace */ |
ffe60014 DG |
3724 | ret = ustctl_wait_quiescent(app->sock); |
3725 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3726 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3727 | app->pid, ret); | |
3728 | } | |
48842b30 | 3729 | |
e0c7ec2b DG |
3730 | end: |
3731 | rcu_read_unlock(); | |
840cb59c | 3732 | health_code_update(); |
421cb601 | 3733 | return 0; |
48842b30 | 3734 | |
d0b96690 DG |
3735 | error_unlock: |
3736 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 3737 | rcu_read_unlock(); |
840cb59c | 3738 | health_code_update(); |
421cb601 DG |
3739 | return -1; |
3740 | } | |
48842b30 | 3741 | |
8be98f9a MD |
3742 | /* |
3743 | * Stop tracing for a specific UST session and app. | |
3744 | */ | |
b34cbebf | 3745 | static |
8be98f9a MD |
3746 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
3747 | { | |
3748 | int ret = 0; | |
3749 | struct ust_app_session *ua_sess; | |
7972aab2 | 3750 | struct ust_registry_session *registry; |
8be98f9a | 3751 | |
852d0037 | 3752 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
3753 | |
3754 | rcu_read_lock(); | |
3755 | ||
e0c7ec2b | 3756 | if (!app->compatible) { |
d88aee68 | 3757 | goto end_no_session; |
e0c7ec2b DG |
3758 | } |
3759 | ||
8be98f9a MD |
3760 | ua_sess = lookup_session_by_app(usess, app); |
3761 | if (ua_sess == NULL) { | |
d88aee68 | 3762 | goto end_no_session; |
8be98f9a MD |
3763 | } |
3764 | ||
d88aee68 DG |
3765 | pthread_mutex_lock(&ua_sess->lock); |
3766 | ||
9bc07046 DG |
3767 | /* |
3768 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
3769 | * that was never started. It's possible since we can have a fail start |
3770 | * from either the application manager thread or the command thread. Simply | |
3771 | * indicate that this is a stop error. | |
9bc07046 | 3772 | */ |
f9dfc3d9 | 3773 | if (!ua_sess->started) { |
c45536e1 DG |
3774 | goto error_rcu_unlock; |
3775 | } | |
7db205b5 | 3776 | |
840cb59c | 3777 | health_code_update(); |
86acf0da | 3778 | |
9d6c7d3f | 3779 | /* This inhibits UST tracing */ |
852d0037 | 3780 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
9d6c7d3f | 3781 | if (ret < 0) { |
ffe60014 DG |
3782 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3783 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
3784 | app->pid, ret); | |
3785 | } else { | |
3786 | DBG("UST app stop session failed. Application is dead."); | |
3787 | } | |
9d6c7d3f DG |
3788 | goto error_rcu_unlock; |
3789 | } | |
3790 | ||
840cb59c | 3791 | health_code_update(); |
86acf0da | 3792 | |
9d6c7d3f | 3793 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
3794 | ret = ustctl_wait_quiescent(app->sock); |
3795 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3796 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3797 | app->pid, ret); | |
3798 | } | |
9d6c7d3f | 3799 | |
840cb59c | 3800 | health_code_update(); |
86acf0da | 3801 | |
b34cbebf MD |
3802 | registry = get_session_registry(ua_sess); |
3803 | assert(registry); | |
1b532a60 DG |
3804 | |
3805 | if (!registry->metadata_closed) { | |
3806 | /* Push metadata for application before freeing the application. */ | |
3807 | (void) push_metadata(registry, ua_sess->consumer); | |
3808 | } | |
b34cbebf MD |
3809 | |
3810 | pthread_mutex_unlock(&ua_sess->lock); | |
3811 | end_no_session: | |
3812 | rcu_read_unlock(); | |
3813 | health_code_update(); | |
3814 | return 0; | |
3815 | ||
3816 | error_rcu_unlock: | |
3817 | pthread_mutex_unlock(&ua_sess->lock); | |
3818 | rcu_read_unlock(); | |
3819 | health_code_update(); | |
3820 | return -1; | |
3821 | } | |
3822 | ||
3823 | /* | |
3824 | * Flush buffers for a specific UST session and app. | |
3825 | */ | |
3826 | static | |
3827 | int ust_app_flush_trace(struct ltt_ust_session *usess, struct ust_app *app) | |
3828 | { | |
3829 | int ret = 0; | |
3830 | struct lttng_ht_iter iter; | |
3831 | struct ust_app_session *ua_sess; | |
3832 | struct ust_app_channel *ua_chan; | |
3833 | ||
3834 | DBG("Flushing buffers for ust app pid %d", app->pid); | |
3835 | ||
3836 | rcu_read_lock(); | |
3837 | ||
3838 | if (!app->compatible) { | |
3839 | goto end_no_session; | |
3840 | } | |
3841 | ||
3842 | ua_sess = lookup_session_by_app(usess, app); | |
3843 | if (ua_sess == NULL) { | |
3844 | goto end_no_session; | |
3845 | } | |
3846 | ||
3847 | pthread_mutex_lock(&ua_sess->lock); | |
3848 | ||
3849 | health_code_update(); | |
3850 | ||
9d6c7d3f | 3851 | /* Flushing buffers */ |
bec39940 DG |
3852 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
3853 | node.node) { | |
840cb59c | 3854 | health_code_update(); |
ffe60014 | 3855 | assert(ua_chan->is_sent); |
852d0037 | 3856 | ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj); |
8be98f9a | 3857 | if (ret < 0) { |
ffe60014 DG |
3858 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3859 | ERR("UST app PID %d channel %s flush failed with ret %d", | |
3860 | app->pid, ua_chan->name, ret); | |
3861 | } else { | |
3862 | DBG3("UST app failed to flush %s. Application is dead.", | |
3863 | ua_chan->name); | |
3864 | /* No need to continue. */ | |
d88aee68 | 3865 | break; |
ffe60014 | 3866 | } |
6d3686da DG |
3867 | /* Continuing flushing all buffers */ |
3868 | continue; | |
8be98f9a MD |
3869 | } |
3870 | } | |
8be98f9a | 3871 | |
840cb59c | 3872 | health_code_update(); |
86acf0da | 3873 | |
d88aee68 DG |
3874 | pthread_mutex_unlock(&ua_sess->lock); |
3875 | end_no_session: | |
7db205b5 | 3876 | rcu_read_unlock(); |
840cb59c | 3877 | health_code_update(); |
8be98f9a | 3878 | return 0; |
8be98f9a MD |
3879 | } |
3880 | ||
84cd17c6 MD |
3881 | /* |
3882 | * Destroy a specific UST session in apps. | |
3883 | */ | |
3353de95 | 3884 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 3885 | { |
ffe60014 | 3886 | int ret; |
84cd17c6 | 3887 | struct ust_app_session *ua_sess; |
bec39940 | 3888 | struct lttng_ht_iter iter; |
d9bf3ca4 | 3889 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 3890 | |
852d0037 | 3891 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
3892 | |
3893 | rcu_read_lock(); | |
3894 | ||
e0c7ec2b DG |
3895 | if (!app->compatible) { |
3896 | goto end; | |
3897 | } | |
3898 | ||
84cd17c6 | 3899 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 3900 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 3901 | if (node == NULL) { |
d42f20df DG |
3902 | /* Session is being or is deleted. */ |
3903 | goto end; | |
84cd17c6 MD |
3904 | } |
3905 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 3906 | |
840cb59c | 3907 | health_code_update(); |
d0b96690 | 3908 | destroy_app_session(app, ua_sess); |
84cd17c6 | 3909 | |
840cb59c | 3910 | health_code_update(); |
7db205b5 | 3911 | |
84cd17c6 | 3912 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
3913 | ret = ustctl_wait_quiescent(app->sock); |
3914 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3915 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3916 | app->pid, ret); | |
3917 | } | |
e0c7ec2b DG |
3918 | end: |
3919 | rcu_read_unlock(); | |
840cb59c | 3920 | health_code_update(); |
84cd17c6 | 3921 | return 0; |
84cd17c6 MD |
3922 | } |
3923 | ||
5b4a0ec0 DG |
3924 | /* |
3925 | * Start tracing for the UST session. | |
3926 | */ | |
421cb601 DG |
3927 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
3928 | { | |
3929 | int ret = 0; | |
bec39940 | 3930 | struct lttng_ht_iter iter; |
421cb601 | 3931 | struct ust_app *app; |
48842b30 | 3932 | |
421cb601 DG |
3933 | DBG("Starting all UST traces"); |
3934 | ||
3935 | rcu_read_lock(); | |
421cb601 | 3936 | |
852d0037 | 3937 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
421cb601 | 3938 | ret = ust_app_start_trace(usess, app); |
48842b30 | 3939 | if (ret < 0) { |
5b4a0ec0 DG |
3940 | /* Continue to next apps even on error */ |
3941 | continue; | |
48842b30 | 3942 | } |
48842b30 | 3943 | } |
5b4a0ec0 | 3944 | |
48842b30 DG |
3945 | rcu_read_unlock(); |
3946 | ||
3947 | return 0; | |
3948 | } | |
487cf67c | 3949 | |
8be98f9a MD |
3950 | /* |
3951 | * Start tracing for the UST session. | |
3952 | */ | |
3953 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
3954 | { | |
3955 | int ret = 0; | |
bec39940 | 3956 | struct lttng_ht_iter iter; |
8be98f9a MD |
3957 | struct ust_app *app; |
3958 | ||
3959 | DBG("Stopping all UST traces"); | |
3960 | ||
3961 | rcu_read_lock(); | |
3962 | ||
b34cbebf MD |
3963 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3964 | ret = ust_app_stop_trace(usess, app); | |
3965 | if (ret < 0) { | |
3966 | /* Continue to next apps even on error */ | |
3967 | continue; | |
3968 | } | |
3969 | } | |
3970 | ||
b0a5f0fb | 3971 | /* Flush buffers and push metadata (for UID buffers). */ |
b34cbebf MD |
3972 | switch (usess->buffer_type) { |
3973 | case LTTNG_BUFFER_PER_UID: | |
3974 | { | |
7972aab2 | 3975 | struct buffer_reg_uid *reg; |
b34cbebf MD |
3976 | |
3977 | /* Flush all per UID buffers associated to that session. */ | |
7972aab2 | 3978 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
b0a5f0fb | 3979 | struct ust_registry_session *ust_session_reg; |
7972aab2 DG |
3980 | struct buffer_reg_channel *reg_chan; |
3981 | struct consumer_socket *socket; | |
3982 | ||
3983 | /* Get consumer socket to use to push the metadata.*/ | |
3984 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
3985 | usess->consumer); | |
3986 | if (!socket) { | |
3987 | /* Ignore request if no consumer is found for the session. */ | |
3988 | continue; | |
3989 | } | |
3990 | ||
3991 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
3992 | reg_chan, node.node) { | |
3993 | /* | |
3994 | * The following call will print error values so the return | |
3995 | * code is of little importance because whatever happens, we | |
3996 | * have to try them all. | |
3997 | */ | |
3998 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
3999 | } | |
b0a5f0fb MD |
4000 | |
4001 | ust_session_reg = reg->registry->reg.ust; | |
4002 | if (!ust_session_reg->metadata_closed) { | |
4003 | /* Push metadata. */ | |
4004 | (void) push_metadata(ust_session_reg, usess->consumer); | |
4005 | } | |
7972aab2 | 4006 | } |
b0a5f0fb | 4007 | |
b34cbebf | 4008 | break; |
7972aab2 | 4009 | } |
b34cbebf MD |
4010 | case LTTNG_BUFFER_PER_PID: |
4011 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4012 | ret = ust_app_flush_trace(usess, app); | |
4013 | if (ret < 0) { | |
4014 | /* Continue to next apps even on error */ | |
4015 | continue; | |
4016 | } | |
8be98f9a | 4017 | } |
b34cbebf MD |
4018 | break; |
4019 | default: | |
4020 | assert(0); | |
4021 | break; | |
8be98f9a MD |
4022 | } |
4023 | ||
4024 | rcu_read_unlock(); | |
4025 | ||
4026 | return 0; | |
4027 | } | |
4028 | ||
84cd17c6 MD |
4029 | /* |
4030 | * Destroy app UST session. | |
4031 | */ | |
4032 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
4033 | { | |
4034 | int ret = 0; | |
bec39940 | 4035 | struct lttng_ht_iter iter; |
84cd17c6 MD |
4036 | struct ust_app *app; |
4037 | ||
4038 | DBG("Destroy all UST traces"); | |
4039 | ||
4040 | rcu_read_lock(); | |
4041 | ||
852d0037 | 4042 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 4043 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
4044 | if (ret < 0) { |
4045 | /* Continue to next apps even on error */ | |
4046 | continue; | |
4047 | } | |
4048 | } | |
4049 | ||
4050 | rcu_read_unlock(); | |
4051 | ||
4052 | return 0; | |
4053 | } | |
4054 | ||
5b4a0ec0 DG |
4055 | /* |
4056 | * Add channels/events from UST global domain to registered apps at sock. | |
4057 | */ | |
487cf67c DG |
4058 | void ust_app_global_update(struct ltt_ust_session *usess, int sock) |
4059 | { | |
55c54cce | 4060 | int ret = 0; |
31746f93 | 4061 | struct lttng_ht_iter iter, uiter; |
487cf67c | 4062 | struct ust_app *app; |
3d8ca23b | 4063 | struct ust_app_session *ua_sess = NULL; |
487cf67c DG |
4064 | struct ust_app_channel *ua_chan; |
4065 | struct ust_app_event *ua_event; | |
727d5404 | 4066 | struct ust_app_ctx *ua_ctx; |
1f3580c7 | 4067 | |
95e047ff | 4068 | assert(usess); |
ffe60014 | 4069 | assert(sock >= 0); |
1f3580c7 | 4070 | |
d9bf3ca4 | 4071 | DBG2("UST app global update for app sock %d for session id %" PRIu64, sock, |
a991f516 | 4072 | usess->id); |
487cf67c | 4073 | |
284d8f55 DG |
4074 | rcu_read_lock(); |
4075 | ||
487cf67c DG |
4076 | app = find_app_by_sock(sock); |
4077 | if (app == NULL) { | |
d88aee68 DG |
4078 | /* |
4079 | * Application can be unregistered before so this is possible hence | |
4080 | * simply stopping the update. | |
4081 | */ | |
4082 | DBG3("UST app update failed to find app sock %d", sock); | |
487cf67c DG |
4083 | goto error; |
4084 | } | |
4085 | ||
e0c7ec2b DG |
4086 | if (!app->compatible) { |
4087 | goto error; | |
4088 | } | |
4089 | ||
3d8ca23b DG |
4090 | ret = create_ust_app_session(usess, app, &ua_sess, NULL); |
4091 | if (ret < 0) { | |
4092 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
4093 | goto error; |
4094 | } | |
3d8ca23b | 4095 | assert(ua_sess); |
487cf67c | 4096 | |
d0b96690 DG |
4097 | pthread_mutex_lock(&ua_sess->lock); |
4098 | ||
284d8f55 | 4099 | /* |
d0b96690 | 4100 | * We can iterate safely here over all UST app session since the create ust |
284d8f55 DG |
4101 | * app session above made a shadow copy of the UST global domain from the |
4102 | * ltt ust session. | |
4103 | */ | |
bec39940 DG |
4104 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
4105 | node.node) { | |
d65d2de8 DG |
4106 | /* |
4107 | * For a metadata channel, handle it differently. | |
4108 | */ | |
4109 | if (!strncmp(ua_chan->name, DEFAULT_METADATA_NAME, | |
4110 | sizeof(ua_chan->name))) { | |
4111 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, | |
4112 | &ua_chan->attr); | |
c7a339aa DG |
4113 | if (ret < 0) { |
4114 | goto error_unlock; | |
4115 | } | |
d65d2de8 DG |
4116 | /* Remove it from the hash table and continue!. */ |
4117 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
4118 | assert(!ret); | |
4119 | delete_ust_app_channel(-1, ua_chan, app); | |
4120 | continue; | |
4121 | } else { | |
4122 | ret = do_create_channel(app, usess, ua_sess, ua_chan); | |
c7a339aa DG |
4123 | if (ret < 0) { |
4124 | /* | |
4125 | * Stop everything. On error, the application failed, no more | |
4126 | * file descriptor are available or ENOMEM so stopping here is | |
4127 | * the only thing we can do for now. | |
4128 | */ | |
4129 | goto error_unlock; | |
4130 | } | |
487cf67c DG |
4131 | } |
4132 | ||
31746f93 DG |
4133 | /* |
4134 | * Add context using the list so they are enabled in the same order the | |
4135 | * user added them. | |
4136 | */ | |
4137 | cds_list_for_each_entry(ua_ctx, &ua_chan->ctx_list, list) { | |
727d5404 DG |
4138 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); |
4139 | if (ret < 0) { | |
d0b96690 | 4140 | goto error_unlock; |
727d5404 DG |
4141 | } |
4142 | } | |
4143 | ||
4144 | ||
284d8f55 | 4145 | /* For each events */ |
bec39940 DG |
4146 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
4147 | node.node) { | |
284d8f55 DG |
4148 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
4149 | if (ret < 0) { | |
d0b96690 | 4150 | goto error_unlock; |
487cf67c | 4151 | } |
36dc12cc | 4152 | } |
487cf67c DG |
4153 | } |
4154 | ||
d0b96690 DG |
4155 | pthread_mutex_unlock(&ua_sess->lock); |
4156 | ||
36dc12cc | 4157 | if (usess->start_trace) { |
421cb601 | 4158 | ret = ust_app_start_trace(usess, app); |
36dc12cc | 4159 | if (ret < 0) { |
36dc12cc DG |
4160 | goto error; |
4161 | } | |
4162 | ||
852d0037 | 4163 | DBG2("UST trace started for app pid %d", app->pid); |
36dc12cc DG |
4164 | } |
4165 | ||
ffe60014 DG |
4166 | /* Everything went well at this point. */ |
4167 | rcu_read_unlock(); | |
4168 | return; | |
4169 | ||
d0b96690 DG |
4170 | error_unlock: |
4171 | pthread_mutex_unlock(&ua_sess->lock); | |
487cf67c | 4172 | error: |
ffe60014 | 4173 | if (ua_sess) { |
d0b96690 | 4174 | destroy_app_session(app, ua_sess); |
ffe60014 | 4175 | } |
487cf67c DG |
4176 | rcu_read_unlock(); |
4177 | return; | |
4178 | } | |
55cc08a6 DG |
4179 | |
4180 | /* | |
4181 | * Add context to a specific channel for global UST domain. | |
4182 | */ | |
4183 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
4184 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
4185 | { | |
4186 | int ret = 0; | |
bec39940 DG |
4187 | struct lttng_ht_node_str *ua_chan_node; |
4188 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
4189 | struct ust_app_channel *ua_chan = NULL; |
4190 | struct ust_app_session *ua_sess; | |
4191 | struct ust_app *app; | |
4192 | ||
4193 | rcu_read_lock(); | |
4194 | ||
852d0037 | 4195 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4196 | if (!app->compatible) { |
4197 | /* | |
4198 | * TODO: In time, we should notice the caller of this error by | |
4199 | * telling him that this is a version error. | |
4200 | */ | |
4201 | continue; | |
4202 | } | |
55cc08a6 DG |
4203 | ua_sess = lookup_session_by_app(usess, app); |
4204 | if (ua_sess == NULL) { | |
4205 | continue; | |
4206 | } | |
4207 | ||
d0b96690 | 4208 | pthread_mutex_lock(&ua_sess->lock); |
55cc08a6 | 4209 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4210 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4211 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 4212 | if (ua_chan_node == NULL) { |
d0b96690 | 4213 | goto next_app; |
55cc08a6 DG |
4214 | } |
4215 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
4216 | node); | |
55cc08a6 DG |
4217 | ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app); |
4218 | if (ret < 0) { | |
d0b96690 | 4219 | goto next_app; |
55cc08a6 | 4220 | } |
d0b96690 DG |
4221 | next_app: |
4222 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
4223 | } |
4224 | ||
55cc08a6 DG |
4225 | rcu_read_unlock(); |
4226 | return ret; | |
4227 | } | |
4228 | ||
76d45b40 DG |
4229 | /* |
4230 | * Enable event for a channel from a UST session for a specific PID. | |
4231 | */ | |
4232 | int ust_app_enable_event_pid(struct ltt_ust_session *usess, | |
4233 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4234 | { | |
4235 | int ret = 0; | |
bec39940 | 4236 | struct lttng_ht_iter iter; |
18eace3b | 4237 | struct lttng_ht_node_str *ua_chan_node; |
76d45b40 DG |
4238 | struct ust_app *app; |
4239 | struct ust_app_session *ua_sess; | |
4240 | struct ust_app_channel *ua_chan; | |
4241 | struct ust_app_event *ua_event; | |
4242 | ||
4243 | DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid); | |
4244 | ||
4245 | rcu_read_lock(); | |
4246 | ||
4247 | app = ust_app_find_by_pid(pid); | |
4248 | if (app == NULL) { | |
4249 | ERR("UST app enable event per PID %d not found", pid); | |
4250 | ret = -1; | |
d0b96690 | 4251 | goto end; |
76d45b40 DG |
4252 | } |
4253 | ||
e0c7ec2b DG |
4254 | if (!app->compatible) { |
4255 | ret = 0; | |
d0b96690 | 4256 | goto end; |
e0c7ec2b DG |
4257 | } |
4258 | ||
76d45b40 | 4259 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4260 | if (!ua_sess) { |
4261 | /* The application has problem or is probably dead. */ | |
d0b96690 DG |
4262 | ret = 0; |
4263 | goto end; | |
c4a1715b | 4264 | } |
76d45b40 | 4265 | |
d0b96690 | 4266 | pthread_mutex_lock(&ua_sess->lock); |
76d45b40 | 4267 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4268 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4269 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
76d45b40 DG |
4270 | /* If the channel is not found, there is a code flow error */ |
4271 | assert(ua_chan_node); | |
4272 | ||
4273 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4274 | ||
18eace3b DG |
4275 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
4276 | uevent->filter, uevent->attr.loglevel); | |
4277 | if (ua_event == NULL) { | |
76d45b40 DG |
4278 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
4279 | if (ret < 0) { | |
d0b96690 | 4280 | goto end_unlock; |
76d45b40 DG |
4281 | } |
4282 | } else { | |
76d45b40 DG |
4283 | ret = enable_ust_app_event(ua_sess, ua_event, app); |
4284 | if (ret < 0) { | |
d0b96690 | 4285 | goto end_unlock; |
76d45b40 DG |
4286 | } |
4287 | } | |
4288 | ||
d0b96690 DG |
4289 | end_unlock: |
4290 | pthread_mutex_unlock(&ua_sess->lock); | |
4291 | end: | |
76d45b40 DG |
4292 | rcu_read_unlock(); |
4293 | return ret; | |
4294 | } | |
7f79d3a1 DG |
4295 | |
4296 | /* | |
4297 | * Disable event for a channel from a UST session for a specific PID. | |
4298 | */ | |
4299 | int ust_app_disable_event_pid(struct ltt_ust_session *usess, | |
4300 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4301 | { | |
4302 | int ret = 0; | |
bec39940 DG |
4303 | struct lttng_ht_iter iter; |
4304 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
7f79d3a1 DG |
4305 | struct ust_app *app; |
4306 | struct ust_app_session *ua_sess; | |
4307 | struct ust_app_channel *ua_chan; | |
4308 | struct ust_app_event *ua_event; | |
4309 | ||
4310 | DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid); | |
4311 | ||
4312 | rcu_read_lock(); | |
4313 | ||
4314 | app = ust_app_find_by_pid(pid); | |
4315 | if (app == NULL) { | |
4316 | ERR("UST app disable event per PID %d not found", pid); | |
4317 | ret = -1; | |
4318 | goto error; | |
4319 | } | |
4320 | ||
e0c7ec2b DG |
4321 | if (!app->compatible) { |
4322 | ret = 0; | |
4323 | goto error; | |
4324 | } | |
4325 | ||
7f79d3a1 | 4326 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4327 | if (!ua_sess) { |
4328 | /* The application has problem or is probably dead. */ | |
4329 | goto error; | |
4330 | } | |
7f79d3a1 DG |
4331 | |
4332 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
4333 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4334 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
7f79d3a1 DG |
4335 | if (ua_chan_node == NULL) { |
4336 | /* Channel does not exist, skip disabling */ | |
4337 | goto error; | |
4338 | } | |
4339 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4340 | ||
bec39940 DG |
4341 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter); |
4342 | ua_event_node = lttng_ht_iter_get_node_str(&iter); | |
7f79d3a1 DG |
4343 | if (ua_event_node == NULL) { |
4344 | /* Event does not exist, skip disabling */ | |
4345 | goto error; | |
4346 | } | |
4347 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
4348 | ||
4349 | ret = disable_ust_app_event(ua_sess, ua_event, app); | |
4350 | if (ret < 0) { | |
4351 | goto error; | |
4352 | } | |
4353 | ||
4354 | error: | |
4355 | rcu_read_unlock(); | |
4356 | return ret; | |
4357 | } | |
e0c7ec2b | 4358 | |
4466912f DG |
4359 | /* |
4360 | * Calibrate registered applications. | |
4361 | */ | |
4362 | int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate) | |
4363 | { | |
4364 | int ret = 0; | |
4365 | struct lttng_ht_iter iter; | |
4366 | struct ust_app *app; | |
4367 | ||
4368 | rcu_read_lock(); | |
4369 | ||
852d0037 | 4370 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4466912f DG |
4371 | if (!app->compatible) { |
4372 | /* | |
4373 | * TODO: In time, we should notice the caller of this error by | |
4374 | * telling him that this is a version error. | |
4375 | */ | |
4376 | continue; | |
4377 | } | |
4378 | ||
840cb59c | 4379 | health_code_update(); |
86acf0da | 4380 | |
852d0037 | 4381 | ret = ustctl_calibrate(app->sock, calibrate); |
4466912f DG |
4382 | if (ret < 0) { |
4383 | switch (ret) { | |
4384 | case -ENOSYS: | |
4385 | /* Means that it's not implemented on the tracer side. */ | |
4386 | ret = 0; | |
4387 | break; | |
4388 | default: | |
4466912f | 4389 | DBG2("Calibrate app PID %d returned with error %d", |
852d0037 | 4390 | app->pid, ret); |
4466912f DG |
4391 | break; |
4392 | } | |
4393 | } | |
4394 | } | |
4395 | ||
4396 | DBG("UST app global domain calibration finished"); | |
4397 | ||
4398 | rcu_read_unlock(); | |
4399 | ||
840cb59c | 4400 | health_code_update(); |
86acf0da | 4401 | |
4466912f DG |
4402 | return ret; |
4403 | } | |
d0b96690 DG |
4404 | |
4405 | /* | |
4406 | * Receive registration and populate the given msg structure. | |
4407 | * | |
4408 | * On success return 0 else a negative value returned by the ustctl call. | |
4409 | */ | |
4410 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
4411 | { | |
4412 | int ret; | |
4413 | uint32_t pid, ppid, uid, gid; | |
4414 | ||
4415 | assert(msg); | |
4416 | ||
4417 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
4418 | &pid, &ppid, &uid, &gid, | |
4419 | &msg->bits_per_long, | |
4420 | &msg->uint8_t_alignment, | |
4421 | &msg->uint16_t_alignment, | |
4422 | &msg->uint32_t_alignment, | |
4423 | &msg->uint64_t_alignment, | |
4424 | &msg->long_alignment, | |
4425 | &msg->byte_order, | |
4426 | msg->name); | |
4427 | if (ret < 0) { | |
4428 | switch (-ret) { | |
4429 | case EPIPE: | |
4430 | case ECONNRESET: | |
4431 | case LTTNG_UST_ERR_EXITING: | |
4432 | DBG3("UST app recv reg message failed. Application died"); | |
4433 | break; | |
4434 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
4435 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
4436 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
4437 | LTTNG_UST_ABI_MINOR_VERSION); | |
4438 | break; | |
4439 | default: | |
4440 | ERR("UST app recv reg message failed with ret %d", ret); | |
4441 | break; | |
4442 | } | |
4443 | goto error; | |
4444 | } | |
4445 | msg->pid = (pid_t) pid; | |
4446 | msg->ppid = (pid_t) ppid; | |
4447 | msg->uid = (uid_t) uid; | |
4448 | msg->gid = (gid_t) gid; | |
4449 | ||
4450 | error: | |
4451 | return ret; | |
4452 | } | |
4453 | ||
d88aee68 DG |
4454 | /* |
4455 | * Return a ust app channel object using the application object and the channel | |
4456 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
4457 | * lock MUST be acquired before calling this function. | |
4458 | */ | |
d0b96690 DG |
4459 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
4460 | int objd) | |
4461 | { | |
4462 | struct lttng_ht_node_ulong *node; | |
4463 | struct lttng_ht_iter iter; | |
4464 | struct ust_app_channel *ua_chan = NULL; | |
4465 | ||
4466 | assert(app); | |
4467 | ||
4468 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
4469 | node = lttng_ht_iter_get_node_ulong(&iter); | |
4470 | if (node == NULL) { | |
4471 | DBG2("UST app channel find by objd %d not found", objd); | |
4472 | goto error; | |
4473 | } | |
4474 | ||
4475 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
4476 | ||
4477 | error: | |
4478 | return ua_chan; | |
4479 | } | |
4480 | ||
d88aee68 DG |
4481 | /* |
4482 | * Reply to a register channel notification from an application on the notify | |
4483 | * socket. The channel metadata is also created. | |
4484 | * | |
4485 | * The session UST registry lock is acquired in this function. | |
4486 | * | |
4487 | * On success 0 is returned else a negative value. | |
4488 | */ | |
d0b96690 DG |
4489 | static int reply_ust_register_channel(int sock, int sobjd, int cobjd, |
4490 | size_t nr_fields, struct ustctl_field *fields) | |
4491 | { | |
4492 | int ret, ret_code = 0; | |
4493 | uint32_t chan_id, reg_count; | |
7972aab2 | 4494 | uint64_t chan_reg_key; |
d0b96690 DG |
4495 | enum ustctl_channel_header type; |
4496 | struct ust_app *app; | |
4497 | struct ust_app_channel *ua_chan; | |
4498 | struct ust_app_session *ua_sess; | |
7972aab2 | 4499 | struct ust_registry_session *registry; |
45893984 | 4500 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
4501 | |
4502 | rcu_read_lock(); | |
4503 | ||
4504 | /* Lookup application. If not found, there is a code flow error. */ | |
4505 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4506 | if (!app) { |
4507 | DBG("Application socket %d is being teardown. Abort event notify", | |
4508 | sock); | |
4509 | ret = 0; | |
d5d629b5 | 4510 | free(fields); |
d88aee68 DG |
4511 | goto error_rcu_unlock; |
4512 | } | |
d0b96690 | 4513 | |
4950b860 | 4514 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4515 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4516 | if (!ua_chan) { |
4517 | DBG("Application channel is being teardown. Abort event notify"); | |
4518 | ret = 0; | |
d5d629b5 | 4519 | free(fields); |
4950b860 MD |
4520 | goto error_rcu_unlock; |
4521 | } | |
4522 | ||
d0b96690 DG |
4523 | assert(ua_chan->session); |
4524 | ua_sess = ua_chan->session; | |
d0b96690 | 4525 | |
7972aab2 DG |
4526 | /* Get right session registry depending on the session buffer type. */ |
4527 | registry = get_session_registry(ua_sess); | |
4528 | assert(registry); | |
45893984 | 4529 | |
7972aab2 DG |
4530 | /* Depending on the buffer type, a different channel key is used. */ |
4531 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4532 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 4533 | } else { |
7972aab2 | 4534 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
4535 | } |
4536 | ||
7972aab2 DG |
4537 | pthread_mutex_lock(®istry->lock); |
4538 | ||
4539 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
4540 | assert(chan_reg); | |
4541 | ||
4542 | if (!chan_reg->register_done) { | |
4543 | reg_count = ust_registry_get_event_count(chan_reg); | |
4544 | if (reg_count < 31) { | |
4545 | type = USTCTL_CHANNEL_HEADER_COMPACT; | |
4546 | } else { | |
4547 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
4548 | } | |
4549 | ||
4550 | chan_reg->nr_ctx_fields = nr_fields; | |
4551 | chan_reg->ctx_fields = fields; | |
4552 | chan_reg->header_type = type; | |
d0b96690 | 4553 | } else { |
7972aab2 DG |
4554 | /* Get current already assigned values. */ |
4555 | type = chan_reg->header_type; | |
d5d629b5 DG |
4556 | free(fields); |
4557 | /* Set to NULL so the error path does not do a double free. */ | |
4558 | fields = NULL; | |
d0b96690 | 4559 | } |
7972aab2 DG |
4560 | /* Channel id is set during the object creation. */ |
4561 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
4562 | |
4563 | /* Append to metadata */ | |
7972aab2 DG |
4564 | if (!chan_reg->metadata_dumped) { |
4565 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
4566 | if (ret_code) { |
4567 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
4568 | goto reply; | |
4569 | } | |
4570 | } | |
4571 | ||
4572 | reply: | |
7972aab2 DG |
4573 | DBG3("UST app replying to register channel key %" PRIu64 |
4574 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
4575 | ret_code); | |
d0b96690 DG |
4576 | |
4577 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
4578 | if (ret < 0) { | |
4579 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4580 | ERR("UST app reply channel failed with ret %d", ret); | |
4581 | } else { | |
4582 | DBG3("UST app reply channel failed. Application died"); | |
4583 | } | |
4584 | goto error; | |
4585 | } | |
4586 | ||
7972aab2 DG |
4587 | /* This channel registry registration is completed. */ |
4588 | chan_reg->register_done = 1; | |
4589 | ||
d0b96690 | 4590 | error: |
7972aab2 | 4591 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4592 | error_rcu_unlock: |
d0b96690 | 4593 | rcu_read_unlock(); |
d5d629b5 DG |
4594 | if (ret) { |
4595 | free(fields); | |
4596 | } | |
d0b96690 DG |
4597 | return ret; |
4598 | } | |
4599 | ||
d88aee68 DG |
4600 | /* |
4601 | * Add event to the UST channel registry. When the event is added to the | |
4602 | * registry, the metadata is also created. Once done, this replies to the | |
4603 | * application with the appropriate error code. | |
4604 | * | |
4605 | * The session UST registry lock is acquired in the function. | |
4606 | * | |
4607 | * On success 0 is returned else a negative value. | |
4608 | */ | |
d0b96690 DG |
4609 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
4610 | char *sig, size_t nr_fields, struct ustctl_field *fields, int loglevel, | |
4611 | char *model_emf_uri) | |
4612 | { | |
4613 | int ret, ret_code; | |
4614 | uint32_t event_id = 0; | |
7972aab2 | 4615 | uint64_t chan_reg_key; |
d0b96690 DG |
4616 | struct ust_app *app; |
4617 | struct ust_app_channel *ua_chan; | |
4618 | struct ust_app_session *ua_sess; | |
7972aab2 | 4619 | struct ust_registry_session *registry; |
d0b96690 DG |
4620 | |
4621 | rcu_read_lock(); | |
4622 | ||
4623 | /* Lookup application. If not found, there is a code flow error. */ | |
4624 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4625 | if (!app) { |
4626 | DBG("Application socket %d is being teardown. Abort event notify", | |
4627 | sock); | |
4628 | ret = 0; | |
d5d629b5 DG |
4629 | free(sig); |
4630 | free(fields); | |
4631 | free(model_emf_uri); | |
d88aee68 DG |
4632 | goto error_rcu_unlock; |
4633 | } | |
d0b96690 | 4634 | |
4950b860 | 4635 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4636 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4637 | if (!ua_chan) { |
4638 | DBG("Application channel is being teardown. Abort event notify"); | |
4639 | ret = 0; | |
d5d629b5 DG |
4640 | free(sig); |
4641 | free(fields); | |
4642 | free(model_emf_uri); | |
4950b860 MD |
4643 | goto error_rcu_unlock; |
4644 | } | |
4645 | ||
d0b96690 DG |
4646 | assert(ua_chan->session); |
4647 | ua_sess = ua_chan->session; | |
4648 | ||
7972aab2 DG |
4649 | registry = get_session_registry(ua_sess); |
4650 | assert(registry); | |
4651 | ||
4652 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4653 | chan_reg_key = ua_chan->tracing_channel_id; | |
4654 | } else { | |
4655 | chan_reg_key = ua_chan->key; | |
4656 | } | |
4657 | ||
4658 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 4659 | |
d5d629b5 DG |
4660 | /* |
4661 | * From this point on, this call acquires the ownership of the sig, fields | |
4662 | * and model_emf_uri meaning any free are done inside it if needed. These | |
4663 | * three variables MUST NOT be read/write after this. | |
4664 | */ | |
7972aab2 | 4665 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
45893984 | 4666 | sobjd, cobjd, name, sig, nr_fields, fields, loglevel, |
8494bda5 MD |
4667 | model_emf_uri, ua_sess->buffer_type, &event_id, |
4668 | app); | |
d0b96690 DG |
4669 | |
4670 | /* | |
4671 | * The return value is returned to ustctl so in case of an error, the | |
4672 | * application can be notified. In case of an error, it's important not to | |
4673 | * return a negative error or else the application will get closed. | |
4674 | */ | |
4675 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
4676 | if (ret < 0) { | |
4677 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4678 | ERR("UST app reply event failed with ret %d", ret); | |
4679 | } else { | |
4680 | DBG3("UST app reply event failed. Application died"); | |
4681 | } | |
4682 | /* | |
4683 | * No need to wipe the create event since the application socket will | |
4684 | * get close on error hence cleaning up everything by itself. | |
4685 | */ | |
4686 | goto error; | |
4687 | } | |
4688 | ||
7972aab2 DG |
4689 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
4690 | name, event_id); | |
d88aee68 | 4691 | |
d0b96690 | 4692 | error: |
7972aab2 | 4693 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4694 | error_rcu_unlock: |
d0b96690 DG |
4695 | rcu_read_unlock(); |
4696 | return ret; | |
4697 | } | |
4698 | ||
d88aee68 DG |
4699 | /* |
4700 | * Handle application notification through the given notify socket. | |
4701 | * | |
4702 | * Return 0 on success or else a negative value. | |
4703 | */ | |
d0b96690 DG |
4704 | int ust_app_recv_notify(int sock) |
4705 | { | |
4706 | int ret; | |
4707 | enum ustctl_notify_cmd cmd; | |
4708 | ||
4709 | DBG3("UST app receiving notify from sock %d", sock); | |
4710 | ||
4711 | ret = ustctl_recv_notify(sock, &cmd); | |
4712 | if (ret < 0) { | |
4713 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4714 | ERR("UST app recv notify failed with ret %d", ret); | |
4715 | } else { | |
4716 | DBG3("UST app recv notify failed. Application died"); | |
4717 | } | |
4718 | goto error; | |
4719 | } | |
4720 | ||
4721 | switch (cmd) { | |
4722 | case USTCTL_NOTIFY_CMD_EVENT: | |
4723 | { | |
4724 | int sobjd, cobjd, loglevel; | |
4725 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; | |
4726 | size_t nr_fields; | |
4727 | struct ustctl_field *fields; | |
4728 | ||
4729 | DBG2("UST app ustctl register event received"); | |
4730 | ||
4731 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, &loglevel, | |
4732 | &sig, &nr_fields, &fields, &model_emf_uri); | |
4733 | if (ret < 0) { | |
4734 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4735 | ERR("UST app recv event failed with ret %d", ret); | |
4736 | } else { | |
4737 | DBG3("UST app recv event failed. Application died"); | |
4738 | } | |
4739 | goto error; | |
4740 | } | |
4741 | ||
d5d629b5 DG |
4742 | /* |
4743 | * Add event to the UST registry coming from the notify socket. This | |
4744 | * call will free if needed the sig, fields and model_emf_uri. This | |
4745 | * code path loses the ownsership of these variables and transfer them | |
4746 | * to the this function. | |
4747 | */ | |
d0b96690 DG |
4748 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
4749 | fields, loglevel, model_emf_uri); | |
4750 | if (ret < 0) { | |
4751 | goto error; | |
4752 | } | |
4753 | ||
4754 | break; | |
4755 | } | |
4756 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
4757 | { | |
4758 | int sobjd, cobjd; | |
4759 | size_t nr_fields; | |
4760 | struct ustctl_field *fields; | |
4761 | ||
4762 | DBG2("UST app ustctl register channel received"); | |
4763 | ||
4764 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
4765 | &fields); | |
4766 | if (ret < 0) { | |
4767 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4768 | ERR("UST app recv channel failed with ret %d", ret); | |
4769 | } else { | |
4770 | DBG3("UST app recv channel failed. Application died"); | |
4771 | } | |
4772 | goto error; | |
4773 | } | |
4774 | ||
d5d629b5 DG |
4775 | /* |
4776 | * The fields ownership are transfered to this function call meaning | |
4777 | * that if needed it will be freed. After this, it's invalid to access | |
4778 | * fields or clean it up. | |
4779 | */ | |
d0b96690 DG |
4780 | ret = reply_ust_register_channel(sock, sobjd, cobjd, nr_fields, |
4781 | fields); | |
4782 | if (ret < 0) { | |
4783 | goto error; | |
4784 | } | |
4785 | ||
4786 | break; | |
4787 | } | |
4788 | default: | |
4789 | /* Should NEVER happen. */ | |
4790 | assert(0); | |
4791 | } | |
4792 | ||
4793 | error: | |
4794 | return ret; | |
4795 | } | |
d88aee68 DG |
4796 | |
4797 | /* | |
4798 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
4799 | * corresponding application. On failure, the call_rcu to close the socket is | |
4800 | * executed. If an application is found, it tries to delete it from the notify | |
4801 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
4802 | * | |
4803 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
4804 | * call RCU is not done but the rest of the cleanup is. | |
4805 | */ | |
4806 | void ust_app_notify_sock_unregister(int sock) | |
4807 | { | |
4808 | int err_enomem = 0; | |
4809 | struct lttng_ht_iter iter; | |
4810 | struct ust_app *app; | |
4811 | struct ust_app_notify_sock_obj *obj; | |
4812 | ||
4813 | assert(sock >= 0); | |
4814 | ||
4815 | rcu_read_lock(); | |
4816 | ||
4817 | obj = zmalloc(sizeof(*obj)); | |
4818 | if (!obj) { | |
4819 | /* | |
4820 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
4821 | * procedure but the call_rcu will not be called. In this case, we | |
4822 | * accept the fd leak rather than possibly creating an unsynchronized | |
4823 | * state between threads. | |
4824 | * | |
4825 | * TODO: The notify object should be created once the notify socket is | |
4826 | * registered and stored independantely from the ust app object. The | |
4827 | * tricky part is to synchronize the teardown of the application and | |
4828 | * this notify object. Let's keep that in mind so we can avoid this | |
4829 | * kind of shenanigans with ENOMEM in the teardown path. | |
4830 | */ | |
4831 | err_enomem = 1; | |
4832 | } else { | |
4833 | obj->fd = sock; | |
4834 | } | |
4835 | ||
4836 | DBG("UST app notify socket unregister %d", sock); | |
4837 | ||
4838 | /* | |
4839 | * Lookup application by notify socket. If this fails, this means that the | |
4840 | * hash table delete has already been done by the application | |
4841 | * unregistration process so we can safely close the notify socket in a | |
4842 | * call RCU. | |
4843 | */ | |
4844 | app = find_app_by_notify_sock(sock); | |
4845 | if (!app) { | |
4846 | goto close_socket; | |
4847 | } | |
4848 | ||
4849 | iter.iter.node = &app->notify_sock_n.node; | |
4850 | ||
4851 | /* | |
4852 | * Whatever happens here either we fail or succeed, in both cases we have | |
4853 | * to close the socket after a grace period to continue to the call RCU | |
4854 | * here. If the deletion is successful, the application is not visible | |
4855 | * anymore by other threads and is it fails it means that it was already | |
4856 | * deleted from the hash table so either way we just have to close the | |
4857 | * socket. | |
4858 | */ | |
4859 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
4860 | ||
4861 | close_socket: | |
4862 | rcu_read_unlock(); | |
4863 | ||
4864 | /* | |
4865 | * Close socket after a grace period to avoid for the socket to be reused | |
4866 | * before the application object is freed creating potential race between | |
4867 | * threads trying to add unique in the global hash table. | |
4868 | */ | |
4869 | if (!err_enomem) { | |
4870 | call_rcu(&obj->head, close_notify_sock_rcu); | |
4871 | } | |
4872 | } | |
f45e313d DG |
4873 | |
4874 | /* | |
4875 | * Destroy a ust app data structure and free its memory. | |
4876 | */ | |
4877 | void ust_app_destroy(struct ust_app *app) | |
4878 | { | |
4879 | if (!app) { | |
4880 | return; | |
4881 | } | |
4882 | ||
4883 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
4884 | } | |
6dc3064a DG |
4885 | |
4886 | /* | |
4887 | * Take a snapshot for a given UST session. The snapshot is sent to the given | |
4888 | * output. | |
4889 | * | |
4890 | * Return 0 on success or else a negative value. | |
4891 | */ | |
4892 | int ust_app_snapshot_record(struct ltt_ust_session *usess, | |
5c786ded | 4893 | struct snapshot_output *output, int wait, unsigned int nb_streams) |
6dc3064a DG |
4894 | { |
4895 | int ret = 0; | |
4896 | struct lttng_ht_iter iter; | |
4897 | struct ust_app *app; | |
af706bb7 | 4898 | char pathname[PATH_MAX]; |
5c786ded | 4899 | uint64_t max_stream_size = 0; |
6dc3064a DG |
4900 | |
4901 | assert(usess); | |
4902 | assert(output); | |
4903 | ||
4904 | rcu_read_lock(); | |
4905 | ||
5c786ded JD |
4906 | /* |
4907 | * Compute the maximum size of a single stream if a max size is asked by | |
4908 | * the caller. | |
4909 | */ | |
4910 | if (output->max_size > 0 && nb_streams > 0) { | |
4911 | max_stream_size = output->max_size / nb_streams; | |
4912 | } | |
4913 | ||
8c924c7b MD |
4914 | switch (usess->buffer_type) { |
4915 | case LTTNG_BUFFER_PER_UID: | |
4916 | { | |
4917 | struct buffer_reg_uid *reg; | |
6dc3064a | 4918 | |
8c924c7b MD |
4919 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
4920 | struct buffer_reg_channel *reg_chan; | |
4921 | struct consumer_socket *socket; | |
6dc3064a | 4922 | |
8c924c7b MD |
4923 | /* Get consumer socket to use to push the metadata.*/ |
4924 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
4925 | usess->consumer); | |
4926 | if (!socket) { | |
4927 | ret = -EINVAL; | |
4928 | goto error; | |
4929 | } | |
6dc3064a | 4930 | |
8c924c7b MD |
4931 | memset(pathname, 0, sizeof(pathname)); |
4932 | ret = snprintf(pathname, sizeof(pathname), | |
4933 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH, | |
4934 | reg->uid, reg->bits_per_long); | |
4935 | if (ret < 0) { | |
4936 | PERROR("snprintf snapshot path"); | |
4937 | goto error; | |
4938 | } | |
4939 | ||
4940 | /* Add the UST default trace dir to path. */ | |
4941 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
4942 | reg_chan, node.node) { | |
4943 | ||
4944 | /* | |
4945 | * Make sure the maximum stream size is not lower than the | |
4946 | * subbuffer size or else it's an error since we won't be able to | |
4947 | * snapshot anything. | |
4948 | */ | |
4949 | if (max_stream_size && | |
4950 | reg_chan->subbuf_size > max_stream_size) { | |
4951 | ret = -EINVAL; | |
4952 | DBG3("UST app snapshot record maximum stream size %" PRIu64 | |
6a00837f | 4953 | " is smaller than subbuffer size of %zu", |
8c924c7b MD |
4954 | max_stream_size, reg_chan->subbuf_size); |
4955 | goto error; | |
4956 | } | |
4957 | ret = consumer_snapshot_channel(socket, reg_chan->consumer_key, output, 0, | |
4958 | usess->uid, usess->gid, pathname, wait, | |
4959 | max_stream_size); | |
4960 | if (ret < 0) { | |
4961 | goto error; | |
4962 | } | |
4963 | } | |
4964 | ret = consumer_snapshot_channel(socket, reg->registry->reg.ust->metadata_key, output, | |
4965 | 1, usess->uid, usess->gid, pathname, wait, | |
4966 | max_stream_size); | |
4967 | if (ret < 0) { | |
4968 | goto error; | |
4969 | } | |
af706bb7 | 4970 | } |
8c924c7b MD |
4971 | break; |
4972 | } | |
4973 | case LTTNG_BUFFER_PER_PID: | |
4974 | { | |
4975 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4976 | struct consumer_socket *socket; | |
4977 | struct lttng_ht_iter chan_iter; | |
4978 | struct ust_app_channel *ua_chan; | |
4979 | struct ust_app_session *ua_sess; | |
4980 | struct ust_registry_session *registry; | |
4981 | ||
4982 | ua_sess = lookup_session_by_app(usess, app); | |
4983 | if (!ua_sess) { | |
4984 | /* Session not associated with this app. */ | |
4985 | continue; | |
4986 | } | |
af706bb7 | 4987 | |
8c924c7b MD |
4988 | /* Get the right consumer socket for the application. */ |
4989 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
4990 | output->consumer); | |
4991 | if (!socket) { | |
5c786ded | 4992 | ret = -EINVAL; |
5c786ded JD |
4993 | goto error; |
4994 | } | |
4995 | ||
8c924c7b MD |
4996 | /* Add the UST default trace dir to path. */ |
4997 | memset(pathname, 0, sizeof(pathname)); | |
4998 | ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "/%s", | |
4999 | ua_sess->path); | |
6dc3064a | 5000 | if (ret < 0) { |
8c924c7b | 5001 | PERROR("snprintf snapshot path"); |
6dc3064a DG |
5002 | goto error; |
5003 | } | |
6dc3064a | 5004 | |
8c924c7b MD |
5005 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, |
5006 | ua_chan, node.node) { | |
5007 | /* | |
5008 | * Make sure the maximum stream size is not lower than the | |
5009 | * subbuffer size or else it's an error since we won't be able to | |
5010 | * snapshot anything. | |
5011 | */ | |
5012 | if (max_stream_size && | |
5013 | ua_chan->attr.subbuf_size > max_stream_size) { | |
5014 | ret = -EINVAL; | |
5015 | DBG3("UST app snapshot record maximum stream size %" PRIu64 | |
5016 | " is smaller than subbuffer size of %" PRIu64, | |
5017 | max_stream_size, ua_chan->attr.subbuf_size); | |
5018 | goto error; | |
5019 | } | |
6dc3064a | 5020 | |
8c924c7b MD |
5021 | ret = consumer_snapshot_channel(socket, ua_chan->key, output, 0, |
5022 | ua_sess->euid, ua_sess->egid, pathname, wait, | |
5023 | max_stream_size); | |
5024 | if (ret < 0) { | |
5025 | goto error; | |
5026 | } | |
5027 | } | |
5028 | ||
5029 | registry = get_session_registry(ua_sess); | |
5030 | assert(registry); | |
5031 | ret = consumer_snapshot_channel(socket, registry->metadata_key, output, | |
5032 | 1, ua_sess->euid, ua_sess->egid, pathname, wait, | |
5033 | max_stream_size); | |
5034 | if (ret < 0) { | |
5035 | goto error; | |
5036 | } | |
5037 | } | |
5038 | break; | |
5039 | } | |
5040 | default: | |
5041 | assert(0); | |
5042 | break; | |
6dc3064a DG |
5043 | } |
5044 | ||
5045 | error: | |
5046 | rcu_read_unlock(); | |
5047 | return ret; | |
5048 | } | |
5c786ded JD |
5049 | |
5050 | /* | |
5051 | * Return the number of streams for a UST session. | |
5052 | */ | |
5053 | unsigned int ust_app_get_nb_stream(struct ltt_ust_session *usess) | |
5054 | { | |
5055 | unsigned int ret = 0; | |
5056 | struct ust_app *app; | |
5057 | struct lttng_ht_iter iter; | |
5058 | ||
5059 | assert(usess); | |
5060 | ||
5061 | switch (usess->buffer_type) { | |
5062 | case LTTNG_BUFFER_PER_UID: | |
5063 | { | |
5064 | struct buffer_reg_uid *reg; | |
5065 | ||
5066 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
5067 | struct buffer_reg_channel *reg_chan; | |
5068 | ||
5069 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
5070 | reg_chan, node.node) { | |
5071 | ret += reg_chan->stream_count; | |
5072 | } | |
5073 | } | |
5074 | break; | |
5075 | } | |
5076 | case LTTNG_BUFFER_PER_PID: | |
5077 | { | |
5078 | rcu_read_lock(); | |
5079 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5080 | struct ust_app_channel *ua_chan; | |
5081 | struct ust_app_session *ua_sess; | |
5082 | struct lttng_ht_iter chan_iter; | |
5083 | ||
5084 | ua_sess = lookup_session_by_app(usess, app); | |
5085 | if (!ua_sess) { | |
5086 | /* Session not associated with this app. */ | |
5087 | continue; | |
5088 | } | |
5089 | ||
5090 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
5091 | ua_chan, node.node) { | |
5092 | ret += ua_chan->streams.count; | |
5093 | } | |
5094 | } | |
5095 | rcu_read_unlock(); | |
5096 | break; | |
5097 | } | |
5098 | default: | |
5099 | assert(0); | |
5100 | break; | |
5101 | } | |
5102 | ||
5103 | return ret; | |
5104 | } |