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 DG |
40 | #include "ust-ctl.h" |
41 | ||
ffe60014 DG |
42 | /* Next available channel key. */ |
43 | static unsigned long next_channel_key; | |
7972aab2 | 44 | static unsigned long next_session_id; |
ffe60014 DG |
45 | |
46 | /* | |
47 | * Return the atomically incremented value of next_channel_key. | |
48 | */ | |
49 | static inline unsigned long get_next_channel_key(void) | |
50 | { | |
51 | return uatomic_add_return(&next_channel_key, 1); | |
52 | } | |
53 | ||
54 | /* | |
7972aab2 | 55 | * Return the atomically incremented value of next_session_id. |
ffe60014 | 56 | */ |
7972aab2 | 57 | static inline unsigned long get_next_session_id(void) |
ffe60014 | 58 | { |
7972aab2 | 59 | return uatomic_add_return(&next_session_id, 1); |
ffe60014 DG |
60 | } |
61 | ||
d65d2de8 DG |
62 | static void copy_channel_attr_to_ustctl( |
63 | struct ustctl_consumer_channel_attr *attr, | |
64 | struct lttng_ust_channel_attr *uattr) | |
65 | { | |
66 | /* Copy event attributes since the layout is different. */ | |
67 | attr->subbuf_size = uattr->subbuf_size; | |
68 | attr->num_subbuf = uattr->num_subbuf; | |
69 | attr->overwrite = uattr->overwrite; | |
70 | attr->switch_timer_interval = uattr->switch_timer_interval; | |
71 | attr->read_timer_interval = uattr->read_timer_interval; | |
72 | attr->output = uattr->output; | |
73 | } | |
74 | ||
025faf73 DG |
75 | /* |
76 | * Match function for the hash table lookup. | |
77 | * | |
78 | * It matches an ust app event based on three attributes which are the event | |
79 | * name, the filter bytecode and the loglevel. | |
80 | */ | |
18eace3b DG |
81 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
82 | { | |
83 | struct ust_app_event *event; | |
84 | const struct ust_app_ht_key *key; | |
85 | ||
86 | assert(node); | |
87 | assert(_key); | |
88 | ||
89 | event = caa_container_of(node, struct ust_app_event, node.node); | |
90 | key = _key; | |
91 | ||
92 | /* Match the 3 elements of the key: name, filter and loglevel. */ | |
93 | ||
94 | /* Event name */ | |
95 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
96 | goto no_match; | |
97 | } | |
98 | ||
99 | /* Event loglevel. */ | |
100 | if (event->attr.loglevel != key->loglevel) { | |
025faf73 DG |
101 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
102 | && key->loglevel == 0 && event->attr.loglevel == -1) { | |
103 | /* | |
104 | * Match is accepted. This is because on event creation, the | |
105 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
106 | * -1 are accepted for this loglevel type since 0 is the one set by | |
107 | * the API when receiving an enable event. | |
108 | */ | |
109 | } else { | |
110 | goto no_match; | |
111 | } | |
18eace3b DG |
112 | } |
113 | ||
114 | /* One of the filters is NULL, fail. */ | |
115 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
116 | goto no_match; | |
117 | } | |
118 | ||
025faf73 DG |
119 | if (key->filter && event->filter) { |
120 | /* Both filters exists, check length followed by the bytecode. */ | |
121 | if (event->filter->len != key->filter->len || | |
122 | memcmp(event->filter->data, key->filter->data, | |
123 | event->filter->len) != 0) { | |
124 | goto no_match; | |
125 | } | |
18eace3b DG |
126 | } |
127 | ||
025faf73 | 128 | /* Match. */ |
18eace3b DG |
129 | return 1; |
130 | ||
131 | no_match: | |
132 | return 0; | |
18eace3b DG |
133 | } |
134 | ||
025faf73 DG |
135 | /* |
136 | * Unique add of an ust app event in the given ht. This uses the custom | |
137 | * ht_match_ust_app_event match function and the event name as hash. | |
138 | */ | |
d0b96690 | 139 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
140 | struct ust_app_event *event) |
141 | { | |
142 | struct cds_lfht_node *node_ptr; | |
143 | struct ust_app_ht_key key; | |
d0b96690 | 144 | struct lttng_ht *ht; |
18eace3b | 145 | |
d0b96690 DG |
146 | assert(ua_chan); |
147 | assert(ua_chan->events); | |
18eace3b DG |
148 | assert(event); |
149 | ||
d0b96690 | 150 | ht = ua_chan->events; |
18eace3b DG |
151 | key.name = event->attr.name; |
152 | key.filter = event->filter; | |
153 | key.loglevel = event->attr.loglevel; | |
154 | ||
155 | node_ptr = cds_lfht_add_unique(ht->ht, | |
156 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
157 | ht_match_ust_app_event, &key, &event->node.node); | |
158 | assert(node_ptr == &event->node.node); | |
159 | } | |
160 | ||
d88aee68 DG |
161 | /* |
162 | * Close the notify socket from the given RCU head object. This MUST be called | |
163 | * through a call_rcu(). | |
164 | */ | |
165 | static void close_notify_sock_rcu(struct rcu_head *head) | |
166 | { | |
167 | int ret; | |
168 | struct ust_app_notify_sock_obj *obj = | |
169 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
170 | ||
171 | /* Must have a valid fd here. */ | |
172 | assert(obj->fd >= 0); | |
173 | ||
174 | ret = close(obj->fd); | |
175 | if (ret) { | |
176 | ERR("close notify sock %d RCU", obj->fd); | |
177 | } | |
178 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
179 | ||
180 | free(obj); | |
181 | } | |
182 | ||
7972aab2 DG |
183 | /* |
184 | * Return the session registry according to the buffer type of the given | |
185 | * session. | |
186 | * | |
187 | * A registry per UID object MUST exists before calling this function or else | |
188 | * it assert() if not found. RCU read side lock must be acquired. | |
189 | */ | |
190 | static struct ust_registry_session *get_session_registry( | |
191 | struct ust_app_session *ua_sess) | |
192 | { | |
193 | struct ust_registry_session *registry = NULL; | |
194 | ||
195 | assert(ua_sess); | |
196 | ||
197 | switch (ua_sess->buffer_type) { | |
198 | case LTTNG_BUFFER_PER_PID: | |
199 | { | |
200 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
201 | if (!reg_pid) { | |
202 | goto error; | |
203 | } | |
204 | registry = reg_pid->registry->reg.ust; | |
205 | break; | |
206 | } | |
207 | case LTTNG_BUFFER_PER_UID: | |
208 | { | |
209 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
210 | ua_sess->tracing_id, ua_sess->bits_per_long, ua_sess->uid); | |
211 | if (!reg_uid) { | |
212 | goto error; | |
213 | } | |
214 | registry = reg_uid->registry->reg.ust; | |
215 | break; | |
216 | } | |
217 | default: | |
218 | assert(0); | |
219 | }; | |
220 | ||
221 | error: | |
222 | return registry; | |
223 | } | |
224 | ||
55cc08a6 DG |
225 | /* |
226 | * Delete ust context safely. RCU read lock must be held before calling | |
227 | * this function. | |
228 | */ | |
229 | static | |
230 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx) | |
231 | { | |
ffe60014 DG |
232 | int ret; |
233 | ||
234 | assert(ua_ctx); | |
235 | ||
55cc08a6 | 236 | if (ua_ctx->obj) { |
ffe60014 | 237 | ret = ustctl_release_object(sock, ua_ctx->obj); |
d0b96690 DG |
238 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
239 | ERR("UST app sock %d release ctx obj handle %d failed with ret %d", | |
240 | sock, ua_ctx->obj->handle, ret); | |
ffe60014 | 241 | } |
55cc08a6 DG |
242 | free(ua_ctx->obj); |
243 | } | |
244 | free(ua_ctx); | |
245 | } | |
246 | ||
d80a6244 DG |
247 | /* |
248 | * Delete ust app event safely. RCU read lock must be held before calling | |
249 | * this function. | |
250 | */ | |
8b366481 DG |
251 | static |
252 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event) | |
d80a6244 | 253 | { |
ffe60014 DG |
254 | int ret; |
255 | ||
256 | assert(ua_event); | |
257 | ||
53a80697 | 258 | free(ua_event->filter); |
d80a6244 | 259 | |
edb67388 | 260 | if (ua_event->obj != NULL) { |
ffe60014 DG |
261 | ret = ustctl_release_object(sock, ua_event->obj); |
262 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
263 | ERR("UST app sock %d release event obj failed with ret %d", | |
264 | sock, ret); | |
265 | } | |
edb67388 DG |
266 | free(ua_event->obj); |
267 | } | |
d80a6244 DG |
268 | free(ua_event); |
269 | } | |
270 | ||
271 | /* | |
7972aab2 DG |
272 | * Release ust data object of the given stream. |
273 | * | |
274 | * Return 0 on success or else a negative value. | |
d80a6244 | 275 | */ |
7972aab2 | 276 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream) |
d80a6244 | 277 | { |
7972aab2 | 278 | int ret = 0; |
ffe60014 DG |
279 | |
280 | assert(stream); | |
281 | ||
8b366481 | 282 | if (stream->obj) { |
ffe60014 DG |
283 | ret = ustctl_release_object(sock, stream->obj); |
284 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
285 | ERR("UST app sock %d release stream obj failed with ret %d", | |
286 | sock, ret); | |
287 | } | |
4063050c | 288 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
289 | free(stream->obj); |
290 | } | |
7972aab2 DG |
291 | |
292 | return ret; | |
293 | } | |
294 | ||
295 | /* | |
296 | * Delete ust app stream safely. RCU read lock must be held before calling | |
297 | * this function. | |
298 | */ | |
299 | static | |
300 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream) | |
301 | { | |
302 | assert(stream); | |
303 | ||
304 | (void) release_ust_app_stream(sock, stream); | |
84cd17c6 | 305 | free(stream); |
d80a6244 DG |
306 | } |
307 | ||
36b588ed MD |
308 | /* |
309 | * We need to execute ht_destroy outside of RCU read-side critical | |
310 | * section, so we postpone its execution using call_rcu. It is simpler | |
311 | * than to change the semantic of the many callers of | |
312 | * delete_ust_app_channel(). | |
313 | */ | |
314 | static | |
315 | void delete_ust_app_channel_rcu(struct rcu_head *head) | |
316 | { | |
317 | struct ust_app_channel *ua_chan = | |
318 | caa_container_of(head, struct ust_app_channel, rcu_head); | |
319 | ||
320 | lttng_ht_destroy(ua_chan->ctx); | |
321 | lttng_ht_destroy(ua_chan->events); | |
322 | free(ua_chan); | |
323 | } | |
324 | ||
d80a6244 DG |
325 | /* |
326 | * Delete ust app channel safely. RCU read lock must be held before calling | |
327 | * this function. | |
328 | */ | |
8b366481 | 329 | static |
d0b96690 DG |
330 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
331 | struct ust_app *app) | |
d80a6244 DG |
332 | { |
333 | int ret; | |
bec39940 | 334 | struct lttng_ht_iter iter; |
d80a6244 | 335 | struct ust_app_event *ua_event; |
55cc08a6 | 336 | struct ust_app_ctx *ua_ctx; |
030a66fa | 337 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 338 | struct ust_registry_session *registry; |
d80a6244 | 339 | |
ffe60014 DG |
340 | assert(ua_chan); |
341 | ||
342 | DBG3("UST app deleting channel %s", ua_chan->name); | |
343 | ||
55cc08a6 | 344 | /* Wipe stream */ |
d80a6244 | 345 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 346 | cds_list_del(&stream->list); |
d80a6244 DG |
347 | delete_ust_app_stream(sock, stream); |
348 | } | |
349 | ||
55cc08a6 | 350 | /* Wipe context */ |
bec39940 DG |
351 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
352 | ret = lttng_ht_del(ua_chan->ctx, &iter); | |
55cc08a6 DG |
353 | assert(!ret); |
354 | delete_ust_app_ctx(sock, ua_ctx); | |
355 | } | |
d80a6244 | 356 | |
55cc08a6 | 357 | /* Wipe events */ |
bec39940 DG |
358 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
359 | node.node) { | |
360 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 361 | assert(!ret); |
d80a6244 DG |
362 | delete_ust_app_event(sock, ua_event); |
363 | } | |
edb67388 | 364 | |
45893984 | 365 | /* Wipe and free registry from session registry. */ |
7972aab2 DG |
366 | registry = get_session_registry(ua_chan->session); |
367 | if (registry) { | |
368 | ust_registry_channel_del_free(registry, ua_chan->key); | |
369 | } | |
d0b96690 | 370 | |
edb67388 | 371 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
372 | /* Remove channel from application UST object descriptor. */ |
373 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
374 | lttng_ht_del(app->ust_objd, &iter); | |
ffe60014 DG |
375 | ret = ustctl_release_object(sock, ua_chan->obj); |
376 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
377 | ERR("UST app sock %d release channel obj failed with ret %d", | |
378 | sock, ret); | |
379 | } | |
7972aab2 | 380 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
381 | free(ua_chan->obj); |
382 | } | |
36b588ed | 383 | call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); |
d80a6244 DG |
384 | } |
385 | ||
331744e3 JD |
386 | /* |
387 | * Push metadata to consumer socket. The socket lock MUST be acquired. | |
388 | * | |
389 | * On success, return the len of metadata pushed or else a negative value. | |
390 | */ | |
391 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
392 | struct consumer_socket *socket, int send_zero_data) | |
393 | { | |
394 | int ret; | |
395 | char *metadata_str = NULL; | |
396 | size_t len, offset; | |
397 | ssize_t ret_val; | |
398 | ||
399 | assert(registry); | |
400 | assert(socket); | |
401 | /* Should never be 0 which is the initial state. */ | |
402 | assert(registry->metadata_key); | |
403 | ||
404 | pthread_mutex_lock(®istry->lock); | |
405 | ||
406 | offset = registry->metadata_len_sent; | |
407 | len = registry->metadata_len - registry->metadata_len_sent; | |
408 | if (len == 0) { | |
409 | DBG3("No metadata to push for metadata key %" PRIu64, | |
410 | registry->metadata_key); | |
411 | ret_val = len; | |
412 | if (send_zero_data) { | |
413 | DBG("No metadata to push"); | |
414 | goto push_data; | |
415 | } | |
416 | goto end; | |
417 | } | |
418 | ||
419 | /* Allocate only what we have to send. */ | |
420 | metadata_str = zmalloc(len); | |
421 | if (!metadata_str) { | |
422 | PERROR("zmalloc ust app metadata string"); | |
423 | ret_val = -ENOMEM; | |
424 | goto error; | |
425 | } | |
426 | /* Copy what we haven't send out. */ | |
427 | memcpy(metadata_str, registry->metadata + offset, len); | |
428 | registry->metadata_len_sent += len; | |
429 | ||
430 | push_data: | |
431 | pthread_mutex_unlock(®istry->lock); | |
432 | ret = consumer_push_metadata(socket, registry->metadata_key, | |
433 | metadata_str, len, offset); | |
434 | if (ret < 0) { | |
435 | ret_val = ret; | |
436 | goto error_push; | |
437 | } | |
438 | ||
439 | free(metadata_str); | |
440 | return len; | |
441 | ||
442 | end: | |
443 | error: | |
444 | pthread_mutex_unlock(®istry->lock); | |
445 | error_push: | |
446 | free(metadata_str); | |
447 | return ret_val; | |
448 | } | |
449 | ||
d88aee68 DG |
450 | /* |
451 | * For a given application and session, push metadata to consumer. The session | |
452 | * lock MUST be acquired here before calling this. | |
331744e3 JD |
453 | * Either sock or consumer is required : if sock is NULL, the default |
454 | * socket to send the metadata is retrieved from consumer, if sock | |
455 | * is not NULL we use it to send the metadata. | |
d88aee68 DG |
456 | * |
457 | * Return 0 on success else a negative error. | |
458 | */ | |
7972aab2 DG |
459 | static int push_metadata(struct ust_registry_session *registry, |
460 | struct consumer_output *consumer) | |
d88aee68 | 461 | { |
331744e3 JD |
462 | int ret_val; |
463 | ssize_t ret; | |
d88aee68 DG |
464 | struct consumer_socket *socket; |
465 | ||
7972aab2 DG |
466 | assert(registry); |
467 | assert(consumer); | |
468 | ||
469 | rcu_read_lock(); | |
d88aee68 | 470 | |
7972aab2 DG |
471 | /* |
472 | * Means that no metadata was assigned to the session. This can happens if | |
473 | * no start has been done previously. | |
474 | */ | |
475 | if (!registry->metadata_key) { | |
331744e3 | 476 | ret_val = 0; |
7972aab2 | 477 | goto error_rcu_unlock; |
d88aee68 DG |
478 | } |
479 | ||
d88aee68 | 480 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
481 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
482 | consumer); | |
d88aee68 | 483 | if (!socket) { |
331744e3 | 484 | ret_val = -1; |
d88aee68 DG |
485 | goto error_rcu_unlock; |
486 | } | |
487 | ||
488 | /* | |
489 | * TODO: Currently, we hold the socket lock around sampling of the next | |
490 | * metadata segment to ensure we send metadata over the consumer socket in | |
491 | * the correct order. This makes the registry lock nest inside the socket | |
492 | * lock. | |
493 | * | |
494 | * Please note that this is a temporary measure: we should move this lock | |
495 | * back into ust_consumer_push_metadata() when the consumer gets the | |
496 | * ability to reorder the metadata it receives. | |
497 | */ | |
498 | pthread_mutex_lock(socket->lock); | |
331744e3 JD |
499 | ret = ust_app_push_metadata(registry, socket, 0); |
500 | pthread_mutex_unlock(socket->lock); | |
d88aee68 | 501 | if (ret < 0) { |
331744e3 | 502 | ret_val = ret; |
d88aee68 DG |
503 | goto error_rcu_unlock; |
504 | } | |
505 | ||
d88aee68 | 506 | rcu_read_unlock(); |
d88aee68 DG |
507 | return 0; |
508 | ||
d88aee68 DG |
509 | error_rcu_unlock: |
510 | rcu_read_unlock(); | |
331744e3 | 511 | return ret_val; |
d88aee68 DG |
512 | } |
513 | ||
514 | /* | |
515 | * Send to the consumer a close metadata command for the given session. Once | |
516 | * done, the metadata channel is deleted and the session metadata pointer is | |
517 | * nullified. The session lock MUST be acquired here unless the application is | |
518 | * in the destroy path. | |
519 | * | |
520 | * Return 0 on success else a negative value. | |
521 | */ | |
7972aab2 DG |
522 | static int close_metadata(struct ust_registry_session *registry, |
523 | struct consumer_output *consumer) | |
d88aee68 DG |
524 | { |
525 | int ret; | |
526 | struct consumer_socket *socket; | |
527 | ||
7972aab2 DG |
528 | assert(registry); |
529 | assert(consumer); | |
d88aee68 | 530 | |
7972aab2 DG |
531 | rcu_read_lock(); |
532 | ||
533 | if (!registry->metadata_key || registry->metadata_closed) { | |
d88aee68 DG |
534 | ret = 0; |
535 | goto error; | |
536 | } | |
537 | ||
d88aee68 | 538 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
539 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
540 | consumer); | |
d88aee68 DG |
541 | if (!socket) { |
542 | ret = -1; | |
7972aab2 | 543 | goto error; |
d88aee68 DG |
544 | } |
545 | ||
7972aab2 | 546 | ret = consumer_close_metadata(socket, registry->metadata_key); |
d88aee68 | 547 | if (ret < 0) { |
7972aab2 | 548 | goto error; |
d88aee68 DG |
549 | } |
550 | ||
7972aab2 DG |
551 | /* Metadata successfully closed. Flag the registry. */ |
552 | registry->metadata_closed = 1; | |
d88aee68 | 553 | |
d88aee68 | 554 | error: |
7972aab2 | 555 | rcu_read_unlock(); |
d88aee68 DG |
556 | return ret; |
557 | } | |
558 | ||
36b588ed MD |
559 | /* |
560 | * We need to execute ht_destroy outside of RCU read-side critical | |
561 | * section, so we postpone its execution using call_rcu. It is simpler | |
562 | * than to change the semantic of the many callers of | |
563 | * delete_ust_app_session(). | |
564 | */ | |
565 | static | |
566 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
567 | { | |
568 | struct ust_app_session *ua_sess = | |
569 | caa_container_of(head, struct ust_app_session, rcu_head); | |
570 | ||
571 | lttng_ht_destroy(ua_sess->channels); | |
572 | free(ua_sess); | |
573 | } | |
574 | ||
d80a6244 DG |
575 | /* |
576 | * Delete ust app session safely. RCU read lock must be held before calling | |
577 | * this function. | |
578 | */ | |
8b366481 | 579 | static |
d0b96690 DG |
580 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
581 | struct ust_app *app) | |
d80a6244 DG |
582 | { |
583 | int ret; | |
bec39940 | 584 | struct lttng_ht_iter iter; |
d80a6244 | 585 | struct ust_app_channel *ua_chan; |
7972aab2 | 586 | struct ust_registry_session *registry; |
d80a6244 | 587 | |
d88aee68 DG |
588 | assert(ua_sess); |
589 | ||
7972aab2 DG |
590 | registry = get_session_registry(ua_sess); |
591 | if (registry) { | |
d88aee68 | 592 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 593 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 594 | |
7972aab2 DG |
595 | /* |
596 | * Don't ask to close metadata for global per UID buffers. Close | |
597 | * metadata only on destroy trace session in this case. | |
598 | */ | |
599 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { | |
600 | /* And ask to close it for this session registry. */ | |
601 | (void) close_metadata(registry, ua_sess->consumer); | |
602 | } | |
d80a6244 DG |
603 | } |
604 | ||
bec39940 DG |
605 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
606 | node.node) { | |
607 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 608 | assert(!ret); |
d0b96690 | 609 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 610 | } |
d80a6244 | 611 | |
7972aab2 DG |
612 | /* In case of per PID, the registry is kept in the session. */ |
613 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
614 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
615 | if (reg_pid) { | |
616 | buffer_reg_pid_remove(reg_pid); | |
617 | buffer_reg_pid_destroy(reg_pid); | |
618 | } | |
619 | } | |
d0b96690 | 620 | |
aee6bafd | 621 | if (ua_sess->handle != -1) { |
ffe60014 DG |
622 | ret = ustctl_release_handle(sock, ua_sess->handle); |
623 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
624 | ERR("UST app sock %d release session handle failed with ret %d", | |
625 | sock, ret); | |
626 | } | |
aee6bafd | 627 | } |
36b588ed | 628 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 629 | } |
91d76f53 DG |
630 | |
631 | /* | |
284d8f55 DG |
632 | * Delete a traceable application structure from the global list. Never call |
633 | * this function outside of a call_rcu call. | |
36b588ed MD |
634 | * |
635 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 636 | */ |
8b366481 DG |
637 | static |
638 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 639 | { |
8b366481 | 640 | int ret, sock; |
d42f20df | 641 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 642 | |
d80a6244 | 643 | /* Delete ust app sessions info */ |
852d0037 DG |
644 | sock = app->sock; |
645 | app->sock = -1; | |
d80a6244 | 646 | |
8b366481 | 647 | /* Wipe sessions */ |
d42f20df DG |
648 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
649 | teardown_node) { | |
650 | /* Free every object in the session and the session. */ | |
36b588ed | 651 | rcu_read_lock(); |
d0b96690 | 652 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 653 | rcu_read_unlock(); |
d80a6244 | 654 | } |
36b588ed MD |
655 | |
656 | lttng_ht_destroy(app->sessions); | |
7972aab2 | 657 | lttng_ht_destroy(app->ust_objd); |
d80a6244 | 658 | |
6414a713 | 659 | /* |
852d0037 DG |
660 | * Wait until we have deleted the application from the sock hash table |
661 | * before closing this socket, otherwise an application could re-use the | |
662 | * socket ID and race with the teardown, using the same hash table entry. | |
663 | * | |
664 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
665 | * all RCU readers that could run concurrently with unregister app, | |
666 | * therefore we _need_ to only close that socket after a grace period. So | |
667 | * it should stay in this RCU callback. | |
668 | * | |
669 | * This close() is a very important step of the synchronization model so | |
670 | * every modification to this function must be carefully reviewed. | |
6414a713 | 671 | */ |
799e2c4f MD |
672 | ret = close(sock); |
673 | if (ret) { | |
674 | PERROR("close"); | |
675 | } | |
4063050c | 676 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 677 | |
852d0037 | 678 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 679 | free(app); |
099e26bd DG |
680 | } |
681 | ||
682 | /* | |
f6a9efaa | 683 | * URCU intermediate call to delete an UST app. |
099e26bd | 684 | */ |
8b366481 DG |
685 | static |
686 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 687 | { |
bec39940 DG |
688 | struct lttng_ht_node_ulong *node = |
689 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 690 | struct ust_app *app = |
852d0037 | 691 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 692 | |
852d0037 | 693 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 694 | delete_ust_app(app); |
099e26bd DG |
695 | } |
696 | ||
ffe60014 DG |
697 | /* |
698 | * Delete the session from the application ht and delete the data structure by | |
699 | * freeing every object inside and releasing them. | |
700 | */ | |
d0b96690 | 701 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
702 | struct ust_app_session *ua_sess) |
703 | { | |
704 | int ret; | |
705 | struct lttng_ht_iter iter; | |
706 | ||
707 | assert(app); | |
708 | assert(ua_sess); | |
709 | ||
710 | iter.iter.node = &ua_sess->node.node; | |
711 | ret = lttng_ht_del(app->sessions, &iter); | |
712 | if (ret) { | |
713 | /* Already scheduled for teardown. */ | |
714 | goto end; | |
715 | } | |
716 | ||
717 | /* Once deleted, free the data structure. */ | |
d0b96690 | 718 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
719 | |
720 | end: | |
721 | return; | |
722 | } | |
723 | ||
8b366481 DG |
724 | /* |
725 | * Alloc new UST app session. | |
726 | */ | |
727 | static | |
d0b96690 | 728 | struct ust_app_session *alloc_ust_app_session(struct ust_app *app) |
8b366481 DG |
729 | { |
730 | struct ust_app_session *ua_sess; | |
731 | ||
732 | /* Init most of the default value by allocating and zeroing */ | |
733 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
734 | if (ua_sess == NULL) { | |
735 | PERROR("malloc"); | |
ffe60014 | 736 | goto error_free; |
8b366481 DG |
737 | } |
738 | ||
739 | ua_sess->handle = -1; | |
bec39940 | 740 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
d0b96690 | 741 | pthread_mutex_init(&ua_sess->lock, NULL); |
ffe60014 | 742 | |
8b366481 DG |
743 | return ua_sess; |
744 | ||
ffe60014 | 745 | error_free: |
8b366481 DG |
746 | return NULL; |
747 | } | |
748 | ||
749 | /* | |
750 | * Alloc new UST app channel. | |
751 | */ | |
752 | static | |
753 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 754 | struct ust_app_session *ua_sess, |
ffe60014 | 755 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
756 | { |
757 | struct ust_app_channel *ua_chan; | |
758 | ||
759 | /* Init most of the default value by allocating and zeroing */ | |
760 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
761 | if (ua_chan == NULL) { | |
762 | PERROR("malloc"); | |
763 | goto error; | |
764 | } | |
765 | ||
766 | /* Setup channel name */ | |
767 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
768 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
769 | ||
770 | ua_chan->enabled = 1; | |
771 | ua_chan->handle = -1; | |
45893984 | 772 | ua_chan->session = ua_sess; |
ffe60014 | 773 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
774 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
775 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
776 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
777 | |
778 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
779 | ||
780 | /* Copy attributes */ | |
781 | if (attr) { | |
ffe60014 | 782 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
783 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
784 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
785 | ua_chan->attr.overwrite = attr->overwrite; | |
786 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
787 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
788 | ua_chan->attr.output = attr->output; | |
8b366481 | 789 | } |
ffe60014 DG |
790 | /* By default, the channel is a per cpu channel. */ |
791 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
792 | |
793 | DBG3("UST app channel %s allocated", ua_chan->name); | |
794 | ||
795 | return ua_chan; | |
796 | ||
797 | error: | |
798 | return NULL; | |
799 | } | |
800 | ||
37f1c236 DG |
801 | /* |
802 | * Allocate and initialize a UST app stream. | |
803 | * | |
804 | * Return newly allocated stream pointer or NULL on error. | |
805 | */ | |
ffe60014 | 806 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
807 | { |
808 | struct ust_app_stream *stream = NULL; | |
809 | ||
810 | stream = zmalloc(sizeof(*stream)); | |
811 | if (stream == NULL) { | |
812 | PERROR("zmalloc ust app stream"); | |
813 | goto error; | |
814 | } | |
815 | ||
816 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
817 | stream->handle = -1; | |
818 | ||
819 | error: | |
820 | return stream; | |
821 | } | |
822 | ||
8b366481 DG |
823 | /* |
824 | * Alloc new UST app event. | |
825 | */ | |
826 | static | |
827 | struct ust_app_event *alloc_ust_app_event(char *name, | |
828 | struct lttng_ust_event *attr) | |
829 | { | |
830 | struct ust_app_event *ua_event; | |
831 | ||
832 | /* Init most of the default value by allocating and zeroing */ | |
833 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
834 | if (ua_event == NULL) { | |
835 | PERROR("malloc"); | |
836 | goto error; | |
837 | } | |
838 | ||
839 | ua_event->enabled = 1; | |
840 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
841 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 842 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
843 | |
844 | /* Copy attributes */ | |
845 | if (attr) { | |
846 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
847 | } | |
848 | ||
849 | DBG3("UST app event %s allocated", ua_event->name); | |
850 | ||
851 | return ua_event; | |
852 | ||
853 | error: | |
854 | return NULL; | |
855 | } | |
856 | ||
857 | /* | |
858 | * Alloc new UST app context. | |
859 | */ | |
860 | static | |
861 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx) | |
862 | { | |
863 | struct ust_app_ctx *ua_ctx; | |
864 | ||
865 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
866 | if (ua_ctx == NULL) { | |
867 | goto error; | |
868 | } | |
869 | ||
870 | if (uctx) { | |
871 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
872 | } | |
873 | ||
874 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
875 | ||
876 | error: | |
877 | return ua_ctx; | |
878 | } | |
879 | ||
025faf73 DG |
880 | /* |
881 | * Allocate a filter and copy the given original filter. | |
882 | * | |
883 | * Return allocated filter or NULL on error. | |
884 | */ | |
885 | static struct lttng_ust_filter_bytecode *alloc_copy_ust_app_filter( | |
886 | struct lttng_ust_filter_bytecode *orig_f) | |
887 | { | |
888 | struct lttng_ust_filter_bytecode *filter = NULL; | |
889 | ||
890 | /* Copy filter bytecode */ | |
891 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
892 | if (!filter) { | |
893 | PERROR("zmalloc alloc ust app filter"); | |
894 | goto error; | |
895 | } | |
896 | ||
897 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
898 | ||
899 | error: | |
900 | return filter; | |
901 | } | |
902 | ||
099e26bd | 903 | /* |
421cb601 DG |
904 | * Find an ust_app using the sock and return it. RCU read side lock must be |
905 | * held before calling this helper function. | |
099e26bd | 906 | */ |
8b366481 DG |
907 | static |
908 | struct ust_app *find_app_by_sock(int sock) | |
099e26bd | 909 | { |
bec39940 | 910 | struct lttng_ht_node_ulong *node; |
bec39940 | 911 | struct lttng_ht_iter iter; |
f6a9efaa | 912 | |
852d0037 | 913 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 914 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
915 | if (node == NULL) { |
916 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
917 | goto error; |
918 | } | |
852d0037 DG |
919 | |
920 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
921 | |
922 | error: | |
923 | return NULL; | |
099e26bd DG |
924 | } |
925 | ||
d0b96690 DG |
926 | /* |
927 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
928 | * be held before calling this helper function. | |
929 | */ | |
930 | static struct ust_app *find_app_by_notify_sock(int sock) | |
931 | { | |
932 | struct lttng_ht_node_ulong *node; | |
933 | struct lttng_ht_iter iter; | |
934 | ||
935 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
936 | &iter); | |
937 | node = lttng_ht_iter_get_node_ulong(&iter); | |
938 | if (node == NULL) { | |
939 | DBG2("UST app find by notify sock %d not found", sock); | |
940 | goto error; | |
941 | } | |
942 | ||
943 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
944 | ||
945 | error: | |
946 | return NULL; | |
947 | } | |
948 | ||
025faf73 DG |
949 | /* |
950 | * Lookup for an ust app event based on event name, filter bytecode and the | |
951 | * event loglevel. | |
952 | * | |
953 | * Return an ust_app_event object or NULL on error. | |
954 | */ | |
18eace3b DG |
955 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
956 | char *name, struct lttng_ust_filter_bytecode *filter, int loglevel) | |
957 | { | |
958 | struct lttng_ht_iter iter; | |
959 | struct lttng_ht_node_str *node; | |
960 | struct ust_app_event *event = NULL; | |
961 | struct ust_app_ht_key key; | |
18eace3b DG |
962 | |
963 | assert(name); | |
964 | assert(ht); | |
965 | ||
966 | /* Setup key for event lookup. */ | |
967 | key.name = name; | |
968 | key.filter = filter; | |
969 | key.loglevel = loglevel; | |
970 | ||
025faf73 DG |
971 | /* Lookup using the event name as hash and a custom match fct. */ |
972 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
973 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
974 | node = lttng_ht_iter_get_node_str(&iter); |
975 | if (node == NULL) { | |
976 | goto end; | |
977 | } | |
978 | ||
979 | event = caa_container_of(node, struct ust_app_event, node); | |
980 | ||
981 | end: | |
18eace3b DG |
982 | return event; |
983 | } | |
984 | ||
55cc08a6 DG |
985 | /* |
986 | * Create the channel context on the tracer. | |
d0b96690 DG |
987 | * |
988 | * Called with UST app session lock held. | |
55cc08a6 DG |
989 | */ |
990 | static | |
991 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
992 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
993 | { | |
994 | int ret; | |
995 | ||
840cb59c | 996 | health_code_update(); |
86acf0da | 997 | |
852d0037 | 998 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 DG |
999 | ua_chan->obj, &ua_ctx->obj); |
1000 | if (ret < 0) { | |
ffe60014 DG |
1001 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1002 | ERR("UST app create channel context failed for app (pid: %d) " | |
1003 | "with ret %d", app->pid, ret); | |
1004 | } else { | |
1005 | DBG3("UST app disable event failed. Application is dead."); | |
1006 | } | |
55cc08a6 DG |
1007 | goto error; |
1008 | } | |
1009 | ||
1010 | ua_ctx->handle = ua_ctx->obj->handle; | |
1011 | ||
d0b96690 DG |
1012 | DBG2("UST app context handle %d created successfully for channel %s", |
1013 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1014 | |
1015 | error: | |
840cb59c | 1016 | health_code_update(); |
55cc08a6 DG |
1017 | return ret; |
1018 | } | |
1019 | ||
53a80697 MD |
1020 | /* |
1021 | * Set the filter on the tracer. | |
1022 | */ | |
1023 | static | |
1024 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
1025 | struct ust_app *app) | |
1026 | { | |
1027 | int ret; | |
1028 | ||
840cb59c | 1029 | health_code_update(); |
86acf0da | 1030 | |
53a80697 | 1031 | if (!ua_event->filter) { |
86acf0da DG |
1032 | ret = 0; |
1033 | goto error; | |
53a80697 MD |
1034 | } |
1035 | ||
1036 | ret = ustctl_set_filter(app->sock, ua_event->filter, | |
1037 | ua_event->obj); | |
1038 | if (ret < 0) { | |
ffe60014 DG |
1039 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1040 | ERR("UST app event %s filter failed for app (pid: %d) " | |
1041 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1042 | } else { | |
1043 | DBG3("UST app filter event failed. Application is dead."); | |
1044 | } | |
53a80697 MD |
1045 | goto error; |
1046 | } | |
1047 | ||
1048 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
1049 | ||
1050 | error: | |
840cb59c | 1051 | health_code_update(); |
53a80697 MD |
1052 | return ret; |
1053 | } | |
1054 | ||
9730260e DG |
1055 | /* |
1056 | * Disable the specified event on to UST tracer for the UST session. | |
1057 | */ | |
1058 | static int disable_ust_event(struct ust_app *app, | |
1059 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1060 | { | |
1061 | int ret; | |
1062 | ||
840cb59c | 1063 | health_code_update(); |
86acf0da | 1064 | |
852d0037 | 1065 | ret = ustctl_disable(app->sock, ua_event->obj); |
9730260e | 1066 | if (ret < 0) { |
ffe60014 DG |
1067 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1068 | ERR("UST app event %s disable failed for app (pid: %d) " | |
1069 | "and session handle %d with ret %d", | |
1070 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1071 | } else { | |
1072 | DBG3("UST app disable event failed. Application is dead."); | |
1073 | } | |
9730260e DG |
1074 | goto error; |
1075 | } | |
1076 | ||
1077 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 1078 | ua_event->attr.name, app->pid); |
9730260e DG |
1079 | |
1080 | error: | |
840cb59c | 1081 | health_code_update(); |
9730260e DG |
1082 | return ret; |
1083 | } | |
1084 | ||
78f0bacd DG |
1085 | /* |
1086 | * Disable the specified channel on to UST tracer for the UST session. | |
1087 | */ | |
1088 | static int disable_ust_channel(struct ust_app *app, | |
1089 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1090 | { | |
1091 | int ret; | |
1092 | ||
840cb59c | 1093 | health_code_update(); |
86acf0da | 1094 | |
852d0037 | 1095 | ret = ustctl_disable(app->sock, ua_chan->obj); |
78f0bacd | 1096 | if (ret < 0) { |
ffe60014 DG |
1097 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1098 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1099 | "and session handle %d with ret %d", | |
1100 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1101 | } else { | |
1102 | DBG3("UST app disable channel failed. Application is dead."); | |
1103 | } | |
78f0bacd DG |
1104 | goto error; |
1105 | } | |
1106 | ||
78f0bacd | 1107 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1108 | ua_chan->name, app->pid); |
78f0bacd DG |
1109 | |
1110 | error: | |
840cb59c | 1111 | health_code_update(); |
78f0bacd DG |
1112 | return ret; |
1113 | } | |
1114 | ||
1115 | /* | |
1116 | * Enable the specified channel on to UST tracer for the UST session. | |
1117 | */ | |
1118 | static int enable_ust_channel(struct ust_app *app, | |
1119 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1120 | { | |
1121 | int ret; | |
1122 | ||
840cb59c | 1123 | health_code_update(); |
86acf0da | 1124 | |
852d0037 | 1125 | ret = ustctl_enable(app->sock, ua_chan->obj); |
78f0bacd | 1126 | if (ret < 0) { |
ffe60014 DG |
1127 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1128 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1129 | "and session handle %d with ret %d", | |
1130 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1131 | } else { | |
1132 | DBG3("UST app enable channel failed. Application is dead."); | |
1133 | } | |
78f0bacd DG |
1134 | goto error; |
1135 | } | |
1136 | ||
1137 | ua_chan->enabled = 1; | |
1138 | ||
1139 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1140 | ua_chan->name, app->pid); |
78f0bacd DG |
1141 | |
1142 | error: | |
840cb59c | 1143 | health_code_update(); |
78f0bacd DG |
1144 | return ret; |
1145 | } | |
1146 | ||
edb67388 DG |
1147 | /* |
1148 | * Enable the specified event on to UST tracer for the UST session. | |
1149 | */ | |
1150 | static int enable_ust_event(struct ust_app *app, | |
1151 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1152 | { | |
1153 | int ret; | |
1154 | ||
840cb59c | 1155 | health_code_update(); |
86acf0da | 1156 | |
852d0037 | 1157 | ret = ustctl_enable(app->sock, ua_event->obj); |
edb67388 | 1158 | if (ret < 0) { |
ffe60014 DG |
1159 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1160 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1161 | "and session handle %d with ret %d", | |
1162 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1163 | } else { | |
1164 | DBG3("UST app enable event failed. Application is dead."); | |
1165 | } | |
edb67388 DG |
1166 | goto error; |
1167 | } | |
1168 | ||
1169 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1170 | ua_event->attr.name, app->pid); |
edb67388 DG |
1171 | |
1172 | error: | |
840cb59c | 1173 | health_code_update(); |
edb67388 DG |
1174 | return ret; |
1175 | } | |
1176 | ||
099e26bd | 1177 | /* |
7972aab2 | 1178 | * Send channel and stream buffer to application. |
4f3ab6ee | 1179 | * |
ffe60014 | 1180 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1181 | */ |
7972aab2 DG |
1182 | static int send_channel_pid_to_ust(struct ust_app *app, |
1183 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1184 | { |
1185 | int ret; | |
ffe60014 | 1186 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1187 | |
1188 | assert(app); | |
ffe60014 | 1189 | assert(ua_sess); |
4f3ab6ee | 1190 | assert(ua_chan); |
4f3ab6ee | 1191 | |
840cb59c | 1192 | health_code_update(); |
4f3ab6ee | 1193 | |
7972aab2 DG |
1194 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1195 | app->sock); | |
86acf0da | 1196 | |
ffe60014 DG |
1197 | /* Send channel to the application. */ |
1198 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
5b4a0ec0 | 1199 | if (ret < 0) { |
b551a063 DG |
1200 | goto error; |
1201 | } | |
1202 | ||
d88aee68 DG |
1203 | health_code_update(); |
1204 | ||
ffe60014 DG |
1205 | /* Send all streams to application. */ |
1206 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1207 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
1208 | if (ret < 0) { | |
1209 | goto error; | |
1210 | } | |
1211 | /* We don't need the stream anymore once sent to the tracer. */ | |
1212 | cds_list_del(&stream->list); | |
1213 | delete_ust_app_stream(-1, stream); | |
1214 | } | |
ffe60014 DG |
1215 | /* Flag the channel that it is sent to the application. */ |
1216 | ua_chan->is_sent = 1; | |
ffe60014 | 1217 | |
b551a063 | 1218 | error: |
840cb59c | 1219 | health_code_update(); |
b551a063 DG |
1220 | return ret; |
1221 | } | |
1222 | ||
91d76f53 | 1223 | /* |
5b4a0ec0 | 1224 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1225 | * |
1226 | * Should be called with session mutex held. | |
91d76f53 | 1227 | */ |
edb67388 DG |
1228 | static |
1229 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1230 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1231 | { |
5b4a0ec0 | 1232 | int ret = 0; |
284d8f55 | 1233 | |
840cb59c | 1234 | health_code_update(); |
86acf0da | 1235 | |
5b4a0ec0 | 1236 | /* Create UST event on tracer */ |
852d0037 | 1237 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 DG |
1238 | &ua_event->obj); |
1239 | if (ret < 0) { | |
ffe60014 DG |
1240 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1241 | ERR("Error ustctl create event %s for app pid: %d with ret %d", | |
1242 | ua_event->attr.name, app->pid, ret); | |
1243 | } else { | |
1244 | DBG3("UST app create event failed. Application is dead."); | |
1245 | } | |
5b4a0ec0 | 1246 | goto error; |
91d76f53 | 1247 | } |
f6a9efaa | 1248 | |
5b4a0ec0 | 1249 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1250 | |
5b4a0ec0 | 1251 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1252 | ua_event->attr.name, app->pid); |
f6a9efaa | 1253 | |
840cb59c | 1254 | health_code_update(); |
86acf0da | 1255 | |
025faf73 DG |
1256 | /* Set filter if one is present. */ |
1257 | if (ua_event->filter) { | |
1258 | ret = set_ust_event_filter(ua_event, app); | |
1259 | if (ret < 0) { | |
1260 | goto error; | |
1261 | } | |
1262 | } | |
1263 | ||
8535a6d9 | 1264 | /* If event not enabled, disable it on the tracer */ |
fc34caaa | 1265 | if (ua_event->enabled == 0) { |
8535a6d9 DG |
1266 | ret = disable_ust_event(app, ua_sess, ua_event); |
1267 | if (ret < 0) { | |
fc34caaa DG |
1268 | /* |
1269 | * If we hit an EPERM, something is wrong with our disable call. If | |
1270 | * we get an EEXIST, there is a problem on the tracer side since we | |
1271 | * just created it. | |
1272 | */ | |
1273 | switch (ret) { | |
49c336c1 | 1274 | case -LTTNG_UST_ERR_PERM: |
fc34caaa DG |
1275 | /* Code flow problem */ |
1276 | assert(0); | |
49c336c1 | 1277 | case -LTTNG_UST_ERR_EXIST: |
fc34caaa DG |
1278 | /* It's OK for our use case. */ |
1279 | ret = 0; | |
1280 | break; | |
1281 | default: | |
1282 | break; | |
1283 | } | |
8535a6d9 DG |
1284 | goto error; |
1285 | } | |
1286 | } | |
1287 | ||
5b4a0ec0 | 1288 | error: |
840cb59c | 1289 | health_code_update(); |
5b4a0ec0 | 1290 | return ret; |
91d76f53 | 1291 | } |
48842b30 | 1292 | |
5b4a0ec0 DG |
1293 | /* |
1294 | * Copy data between an UST app event and a LTT event. | |
1295 | */ | |
421cb601 | 1296 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1297 | struct ltt_ust_event *uevent) |
1298 | { | |
1299 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); | |
1300 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1301 | ||
fc34caaa DG |
1302 | ua_event->enabled = uevent->enabled; |
1303 | ||
5b4a0ec0 DG |
1304 | /* Copy event attributes */ |
1305 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1306 | ||
53a80697 MD |
1307 | /* Copy filter bytecode */ |
1308 | if (uevent->filter) { | |
025faf73 DG |
1309 | ua_event->filter = alloc_copy_ust_app_filter(uevent->filter); |
1310 | /* Filter might be NULL here in case of ENONEM. */ | |
53a80697 | 1311 | } |
48842b30 DG |
1312 | } |
1313 | ||
5b4a0ec0 DG |
1314 | /* |
1315 | * Copy data between an UST app channel and a LTT channel. | |
1316 | */ | |
421cb601 | 1317 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1318 | struct ltt_ust_channel *uchan) |
1319 | { | |
bec39940 | 1320 | struct lttng_ht_iter iter; |
48842b30 | 1321 | struct ltt_ust_event *uevent; |
55cc08a6 | 1322 | struct ltt_ust_context *uctx; |
48842b30 | 1323 | struct ust_app_event *ua_event; |
55cc08a6 | 1324 | struct ust_app_ctx *ua_ctx; |
48842b30 | 1325 | |
fc34caaa | 1326 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1327 | |
1328 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1329 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 1330 | |
1624d5b7 JD |
1331 | ua_chan->tracefile_size = uchan->tracefile_size; |
1332 | ua_chan->tracefile_count = uchan->tracefile_count; | |
1333 | ||
ffe60014 DG |
1334 | /* Copy event attributes since the layout is different. */ |
1335 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1336 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1337 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1338 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1339 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
1340 | ua_chan->attr.output = uchan->attr.output; | |
1341 | /* | |
1342 | * Note that the attribute channel type is not set since the channel on the | |
1343 | * tracing registry side does not have this information. | |
1344 | */ | |
48842b30 | 1345 | |
fc34caaa | 1346 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1347 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1348 | |
bec39940 | 1349 | cds_lfht_for_each_entry(uchan->ctx->ht, &iter.iter, uctx, node.node) { |
55cc08a6 DG |
1350 | ua_ctx = alloc_ust_app_ctx(&uctx->ctx); |
1351 | if (ua_ctx == NULL) { | |
1352 | continue; | |
1353 | } | |
bec39940 DG |
1354 | lttng_ht_node_init_ulong(&ua_ctx->node, |
1355 | (unsigned long) ua_ctx->ctx.ctx); | |
1356 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
55cc08a6 | 1357 | } |
48842b30 | 1358 | |
421cb601 | 1359 | /* Copy all events from ltt ust channel to ust app channel */ |
bec39940 | 1360 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
18eace3b DG |
1361 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
1362 | uevent->filter, uevent->attr.loglevel); | |
1363 | if (ua_event == NULL) { | |
421cb601 | 1364 | DBG2("UST event %s not found on shadow copy channel", |
48842b30 | 1365 | uevent->attr.name); |
284d8f55 | 1366 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
48842b30 | 1367 | if (ua_event == NULL) { |
5b4a0ec0 | 1368 | continue; |
48842b30 | 1369 | } |
421cb601 | 1370 | shadow_copy_event(ua_event, uevent); |
d0b96690 | 1371 | add_unique_ust_app_event(ua_chan, ua_event); |
48842b30 | 1372 | } |
48842b30 DG |
1373 | } |
1374 | ||
fc34caaa | 1375 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1376 | } |
1377 | ||
5b4a0ec0 DG |
1378 | /* |
1379 | * Copy data between a UST app session and a regular LTT session. | |
1380 | */ | |
421cb601 | 1381 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1382 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1383 | { |
bec39940 DG |
1384 | struct lttng_ht_node_str *ua_chan_node; |
1385 | struct lttng_ht_iter iter; | |
48842b30 DG |
1386 | struct ltt_ust_channel *uchan; |
1387 | struct ust_app_channel *ua_chan; | |
477d7741 MD |
1388 | time_t rawtime; |
1389 | struct tm *timeinfo; | |
1390 | char datetime[16]; | |
1391 | int ret; | |
1392 | ||
1393 | /* Get date and time for unique app path */ | |
1394 | time(&rawtime); | |
1395 | timeinfo = localtime(&rawtime); | |
1396 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1397 | |
421cb601 | 1398 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1399 | |
7972aab2 DG |
1400 | ua_sess->tracing_id = usess->id; |
1401 | ua_sess->id = get_next_session_id(); | |
1402 | ua_sess->uid = app->uid; | |
1403 | ua_sess->gid = app->gid; | |
1404 | ua_sess->euid = usess->uid; | |
1405 | ua_sess->egid = usess->gid; | |
1406 | ua_sess->buffer_type = usess->buffer_type; | |
1407 | ua_sess->bits_per_long = app->bits_per_long; | |
1408 | /* There is only one consumer object per session possible. */ | |
1409 | ua_sess->consumer = usess->consumer; | |
1410 | ||
1411 | switch (ua_sess->buffer_type) { | |
1412 | case LTTNG_BUFFER_PER_PID: | |
1413 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 1414 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
1415 | datetime); |
1416 | break; | |
1417 | case LTTNG_BUFFER_PER_UID: | |
1418 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1419 | DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long); | |
1420 | break; | |
1421 | default: | |
1422 | assert(0); | |
1423 | goto error; | |
1424 | } | |
477d7741 MD |
1425 | if (ret < 0) { |
1426 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1427 | assert(0); |
7972aab2 | 1428 | goto error; |
477d7741 MD |
1429 | } |
1430 | ||
48842b30 | 1431 | /* Iterate over all channels in global domain. */ |
bec39940 DG |
1432 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, |
1433 | uchan, node.node) { | |
1434 | struct lttng_ht_iter uiter; | |
ba767faf | 1435 | |
bec39940 DG |
1436 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
1437 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
5b4a0ec0 | 1438 | if (ua_chan_node != NULL) { |
fc34caaa | 1439 | /* Session exist. Contiuing. */ |
5b4a0ec0 DG |
1440 | continue; |
1441 | } | |
421cb601 | 1442 | |
5b4a0ec0 DG |
1443 | DBG2("Channel %s not found on shadow session copy, creating it", |
1444 | uchan->name); | |
d0b96690 | 1445 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
5b4a0ec0 | 1446 | if (ua_chan == NULL) { |
fc34caaa | 1447 | /* malloc failed FIXME: Might want to do handle ENOMEM .. */ |
5b4a0ec0 | 1448 | continue; |
48842b30 | 1449 | } |
5b4a0ec0 | 1450 | shadow_copy_channel(ua_chan, uchan); |
ffe60014 DG |
1451 | /* |
1452 | * The concept of metadata channel does not exist on the tracing | |
1453 | * registry side of the session daemon so this can only be a per CPU | |
1454 | * channel and not metadata. | |
1455 | */ | |
1456 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
1457 | ||
bec39940 | 1458 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); |
48842b30 | 1459 | } |
7972aab2 DG |
1460 | |
1461 | error: | |
1462 | return; | |
48842b30 DG |
1463 | } |
1464 | ||
78f0bacd DG |
1465 | /* |
1466 | * Lookup sesison wrapper. | |
1467 | */ | |
84cd17c6 MD |
1468 | static |
1469 | void __lookup_session_by_app(struct ltt_ust_session *usess, | |
bec39940 | 1470 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1471 | { |
1472 | /* Get right UST app session from app */ | |
2c348c10 | 1473 | lttng_ht_lookup(app->sessions, (void *)((unsigned long) usess->id), iter); |
84cd17c6 MD |
1474 | } |
1475 | ||
421cb601 DG |
1476 | /* |
1477 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1478 | * id. |
421cb601 | 1479 | */ |
48842b30 DG |
1480 | static struct ust_app_session *lookup_session_by_app( |
1481 | struct ltt_ust_session *usess, struct ust_app *app) | |
1482 | { | |
bec39940 DG |
1483 | struct lttng_ht_iter iter; |
1484 | struct lttng_ht_node_ulong *node; | |
48842b30 | 1485 | |
84cd17c6 | 1486 | __lookup_session_by_app(usess, app, &iter); |
bec39940 | 1487 | node = lttng_ht_iter_get_node_ulong(&iter); |
48842b30 DG |
1488 | if (node == NULL) { |
1489 | goto error; | |
1490 | } | |
1491 | ||
1492 | return caa_container_of(node, struct ust_app_session, node); | |
1493 | ||
1494 | error: | |
1495 | return NULL; | |
1496 | } | |
1497 | ||
7972aab2 DG |
1498 | /* |
1499 | * Setup buffer registry per PID for the given session and application. If none | |
1500 | * is found, a new one is created, added to the global registry and | |
1501 | * initialized. If regp is valid, it's set with the newly created object. | |
1502 | * | |
1503 | * Return 0 on success or else a negative value. | |
1504 | */ | |
1505 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
1506 | struct ust_app *app, struct buffer_reg_pid **regp) | |
1507 | { | |
1508 | int ret = 0; | |
1509 | struct buffer_reg_pid *reg_pid; | |
1510 | ||
1511 | assert(ua_sess); | |
1512 | assert(app); | |
1513 | ||
1514 | rcu_read_lock(); | |
1515 | ||
1516 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
1517 | if (!reg_pid) { | |
1518 | /* | |
1519 | * This is the create channel path meaning that if there is NO | |
1520 | * registry available, we have to create one for this session. | |
1521 | */ | |
1522 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid); | |
1523 | if (ret < 0) { | |
1524 | goto error; | |
1525 | } | |
1526 | buffer_reg_pid_add(reg_pid); | |
1527 | } else { | |
1528 | goto end; | |
1529 | } | |
1530 | ||
1531 | /* Initialize registry. */ | |
1532 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
1533 | app->bits_per_long, app->uint8_t_alignment, | |
1534 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1535 | app->uint64_t_alignment, app->long_alignment, |
1536 | app->byte_order, app->version.major, | |
1537 | app->version.minor); | |
7972aab2 DG |
1538 | if (ret < 0) { |
1539 | goto error; | |
1540 | } | |
1541 | ||
1542 | DBG3("UST app buffer registry per PID created successfully"); | |
1543 | ||
1544 | end: | |
1545 | if (regp) { | |
1546 | *regp = reg_pid; | |
1547 | } | |
1548 | error: | |
1549 | rcu_read_unlock(); | |
1550 | return ret; | |
1551 | } | |
1552 | ||
1553 | /* | |
1554 | * Setup buffer registry per UID 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_uid(struct ltt_ust_session *usess, | |
1561 | struct ust_app *app, struct buffer_reg_uid **regp) | |
1562 | { | |
1563 | int ret = 0; | |
1564 | struct buffer_reg_uid *reg_uid; | |
1565 | ||
1566 | assert(usess); | |
1567 | assert(app); | |
1568 | ||
1569 | rcu_read_lock(); | |
1570 | ||
1571 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
1572 | if (!reg_uid) { | |
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_uid_create(usess->id, app->bits_per_long, app->uid, | |
1578 | LTTNG_DOMAIN_UST, ®_uid); | |
1579 | if (ret < 0) { | |
1580 | goto error; | |
1581 | } | |
1582 | buffer_reg_uid_add(reg_uid); | |
1583 | } else { | |
1584 | goto end; | |
1585 | } | |
1586 | ||
1587 | /* Initialize registry. */ | |
af6142cf | 1588 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
1589 | app->bits_per_long, app->uint8_t_alignment, |
1590 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1591 | app->uint64_t_alignment, app->long_alignment, |
1592 | app->byte_order, app->version.major, | |
1593 | app->version.minor); | |
7972aab2 DG |
1594 | if (ret < 0) { |
1595 | goto error; | |
1596 | } | |
1597 | /* Add node to teardown list of the session. */ | |
1598 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
1599 | ||
1600 | DBG3("UST app buffer registry per UID created successfully"); | |
1601 | ||
1602 | end: | |
1603 | if (regp) { | |
1604 | *regp = reg_uid; | |
1605 | } | |
1606 | error: | |
1607 | rcu_read_unlock(); | |
1608 | return ret; | |
1609 | } | |
1610 | ||
421cb601 | 1611 | /* |
3d8ca23b | 1612 | * Create a session on the tracer side for the given app. |
421cb601 | 1613 | * |
3d8ca23b DG |
1614 | * On success, ua_sess_ptr is populated with the session pointer or else left |
1615 | * untouched. If the session was created, is_created is set to 1. On error, | |
1616 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
1617 | * be NULL. | |
1618 | * | |
1619 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
1620 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 1621 | */ |
3d8ca23b DG |
1622 | static int create_ust_app_session(struct ltt_ust_session *usess, |
1623 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, | |
1624 | int *is_created) | |
421cb601 | 1625 | { |
3d8ca23b | 1626 | int ret, created = 0; |
421cb601 DG |
1627 | struct ust_app_session *ua_sess; |
1628 | ||
3d8ca23b DG |
1629 | assert(usess); |
1630 | assert(app); | |
1631 | assert(ua_sess_ptr); | |
1632 | ||
840cb59c | 1633 | health_code_update(); |
86acf0da | 1634 | |
421cb601 DG |
1635 | ua_sess = lookup_session_by_app(usess, app); |
1636 | if (ua_sess == NULL) { | |
a991f516 | 1637 | DBG2("UST app pid: %d session id %d not found, creating it", |
852d0037 | 1638 | app->pid, usess->id); |
d0b96690 | 1639 | ua_sess = alloc_ust_app_session(app); |
421cb601 DG |
1640 | if (ua_sess == NULL) { |
1641 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
1642 | ret = -ENOMEM; |
1643 | goto error; | |
421cb601 | 1644 | } |
477d7741 | 1645 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 1646 | created = 1; |
421cb601 DG |
1647 | } |
1648 | ||
7972aab2 DG |
1649 | switch (usess->buffer_type) { |
1650 | case LTTNG_BUFFER_PER_PID: | |
1651 | /* Init local registry. */ | |
1652 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 1653 | if (ret < 0) { |
7972aab2 DG |
1654 | goto error; |
1655 | } | |
1656 | break; | |
1657 | case LTTNG_BUFFER_PER_UID: | |
1658 | /* Look for a global registry. If none exists, create one. */ | |
1659 | ret = setup_buffer_reg_uid(usess, app, NULL); | |
1660 | if (ret < 0) { | |
1661 | goto error; | |
1662 | } | |
1663 | break; | |
1664 | default: | |
1665 | assert(0); | |
1666 | ret = -EINVAL; | |
1667 | goto error; | |
1668 | } | |
1669 | ||
1670 | health_code_update(); | |
1671 | ||
1672 | if (ua_sess->handle == -1) { | |
1673 | ret = ustctl_create_session(app->sock); | |
1674 | if (ret < 0) { | |
1675 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1676 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
1677 | app->pid, ret); |
1678 | } else { | |
1679 | DBG("UST app creating session failed. Application is dead"); | |
1680 | } | |
d0b96690 | 1681 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
1682 | if (ret != -ENOMEM) { |
1683 | /* | |
1684 | * Tracer is probably gone or got an internal error so let's | |
1685 | * behave like it will soon unregister or not usable. | |
1686 | */ | |
1687 | ret = -ENOTCONN; | |
1688 | } | |
1689 | goto error; | |
421cb601 DG |
1690 | } |
1691 | ||
7972aab2 DG |
1692 | ua_sess->handle = ret; |
1693 | ||
1694 | /* Add ust app session to app's HT */ | |
1695 | lttng_ht_node_init_ulong(&ua_sess->node, | |
1696 | (unsigned long) ua_sess->tracing_id); | |
1697 | lttng_ht_add_unique_ulong(app->sessions, &ua_sess->node); | |
1698 | ||
1699 | DBG2("UST app session created successfully with handle %d", ret); | |
1700 | } | |
1701 | ||
1702 | *ua_sess_ptr = ua_sess; | |
1703 | if (is_created) { | |
1704 | *is_created = created; | |
1705 | } | |
1706 | ||
1707 | /* Everything went well. */ | |
1708 | ret = 0; | |
1709 | ||
1710 | error: | |
1711 | health_code_update(); | |
1712 | return ret; | |
1713 | } | |
1714 | ||
1715 | /* | |
1716 | * Create a context for the channel on the tracer. | |
1717 | * | |
1718 | * Called with UST app session lock held and a RCU read side lock. | |
1719 | */ | |
1720 | static | |
1721 | int create_ust_app_channel_context(struct ust_app_session *ua_sess, | |
1722 | struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx, | |
1723 | struct ust_app *app) | |
1724 | { | |
1725 | int ret = 0; | |
1726 | struct lttng_ht_iter iter; | |
1727 | struct lttng_ht_node_ulong *node; | |
1728 | struct ust_app_ctx *ua_ctx; | |
1729 | ||
1730 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
1731 | ||
1732 | lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter); | |
1733 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1734 | if (node != NULL) { | |
1735 | ret = -EEXIST; | |
1736 | goto error; | |
1737 | } | |
1738 | ||
1739 | ua_ctx = alloc_ust_app_ctx(uctx); | |
1740 | if (ua_ctx == NULL) { | |
1741 | /* malloc failed */ | |
1742 | ret = -1; | |
1743 | goto error; | |
1744 | } | |
1745 | ||
1746 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
1747 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
1748 | ||
1749 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
1750 | if (ret < 0) { | |
1751 | goto error; | |
1752 | } | |
1753 | ||
1754 | error: | |
1755 | return ret; | |
1756 | } | |
1757 | ||
1758 | /* | |
1759 | * Enable on the tracer side a ust app event for the session and channel. | |
1760 | * | |
1761 | * Called with UST app session lock held. | |
1762 | */ | |
1763 | static | |
1764 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
1765 | struct ust_app_event *ua_event, struct ust_app *app) | |
1766 | { | |
1767 | int ret; | |
1768 | ||
1769 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1770 | if (ret < 0) { | |
1771 | goto error; | |
1772 | } | |
1773 | ||
1774 | ua_event->enabled = 1; | |
1775 | ||
1776 | error: | |
1777 | return ret; | |
1778 | } | |
1779 | ||
1780 | /* | |
1781 | * Disable on the tracer side a ust app event for the session and channel. | |
1782 | */ | |
1783 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
1784 | struct ust_app_event *ua_event, struct ust_app *app) | |
1785 | { | |
1786 | int ret; | |
1787 | ||
1788 | ret = disable_ust_event(app, ua_sess, ua_event); | |
1789 | if (ret < 0) { | |
1790 | goto error; | |
1791 | } | |
1792 | ||
1793 | ua_event->enabled = 0; | |
1794 | ||
1795 | error: | |
1796 | return ret; | |
1797 | } | |
1798 | ||
1799 | /* | |
1800 | * Lookup ust app channel for session and disable it on the tracer side. | |
1801 | */ | |
1802 | static | |
1803 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
1804 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
1805 | { | |
1806 | int ret; | |
1807 | ||
1808 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
1809 | if (ret < 0) { | |
1810 | goto error; | |
1811 | } | |
1812 | ||
1813 | ua_chan->enabled = 0; | |
1814 | ||
1815 | error: | |
1816 | return ret; | |
1817 | } | |
1818 | ||
1819 | /* | |
1820 | * Lookup ust app channel for session and enable it on the tracer side. This | |
1821 | * MUST be called with a RCU read side lock acquired. | |
1822 | */ | |
1823 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
1824 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
1825 | { | |
1826 | int ret = 0; | |
1827 | struct lttng_ht_iter iter; | |
1828 | struct lttng_ht_node_str *ua_chan_node; | |
1829 | struct ust_app_channel *ua_chan; | |
1830 | ||
1831 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
1832 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
1833 | if (ua_chan_node == NULL) { | |
1834 | DBG2("Unable to find channel %s in ust session id %u", | |
1835 | uchan->name, ua_sess->tracing_id); | |
1836 | goto error; | |
1837 | } | |
1838 | ||
1839 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
1840 | ||
1841 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
1842 | if (ret < 0) { | |
1843 | goto error; | |
1844 | } | |
1845 | ||
1846 | error: | |
1847 | return ret; | |
1848 | } | |
1849 | ||
1850 | /* | |
1851 | * Ask the consumer to create a channel and get it if successful. | |
1852 | * | |
1853 | * Return 0 on success or else a negative value. | |
1854 | */ | |
1855 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
1856 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
1857 | int bitness, struct ust_registry_session *registry) | |
1858 | { | |
1859 | int ret; | |
1860 | unsigned int nb_fd = 0; | |
1861 | struct consumer_socket *socket; | |
1862 | ||
1863 | assert(usess); | |
1864 | assert(ua_sess); | |
1865 | assert(ua_chan); | |
1866 | assert(registry); | |
1867 | ||
1868 | rcu_read_lock(); | |
1869 | health_code_update(); | |
1870 | ||
1871 | /* Get the right consumer socket for the application. */ | |
1872 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
1873 | if (!socket) { | |
1874 | ret = -EINVAL; | |
1875 | goto error; | |
1876 | } | |
1877 | ||
1878 | health_code_update(); | |
1879 | ||
1880 | /* Need one fd for the channel. */ | |
1881 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
1882 | if (ret < 0) { | |
1883 | ERR("Exhausted number of available FD upon create channel"); | |
1884 | goto error; | |
1885 | } | |
1886 | ||
1887 | /* | |
1888 | * Ask consumer to create channel. The consumer will return the number of | |
1889 | * stream we have to expect. | |
1890 | */ | |
1891 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
1892 | registry); | |
1893 | if (ret < 0) { | |
1894 | goto error_ask; | |
1895 | } | |
1896 | ||
1897 | /* | |
1898 | * Compute the number of fd needed before receiving them. It must be 2 per | |
1899 | * stream (2 being the default value here). | |
1900 | */ | |
1901 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
1902 | ||
1903 | /* Reserve the amount of file descriptor we need. */ | |
1904 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
1905 | if (ret < 0) { | |
1906 | ERR("Exhausted number of available FD upon create channel"); | |
1907 | goto error_fd_get_stream; | |
1908 | } | |
1909 | ||
1910 | health_code_update(); | |
1911 | ||
1912 | /* | |
1913 | * Now get the channel from the consumer. This call wil populate the stream | |
1914 | * list of that channel and set the ust objects. | |
1915 | */ | |
1916 | ret = ust_consumer_get_channel(socket, ua_chan); | |
1917 | if (ret < 0) { | |
1918 | goto error_destroy; | |
1919 | } | |
1920 | ||
1921 | rcu_read_unlock(); | |
1922 | return 0; | |
1923 | ||
1924 | error_destroy: | |
1925 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
1926 | error_fd_get_stream: | |
1927 | /* | |
1928 | * Initiate a destroy channel on the consumer since we had an error | |
1929 | * handling it on our side. The return value is of no importance since we | |
1930 | * already have a ret value set by the previous error that we need to | |
1931 | * return. | |
1932 | */ | |
1933 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
1934 | error_ask: | |
1935 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
1936 | error: | |
1937 | health_code_update(); | |
1938 | rcu_read_unlock(); | |
1939 | return ret; | |
1940 | } | |
1941 | ||
1942 | /* | |
1943 | * Duplicate the ust data object of the ust app stream and save it in the | |
1944 | * buffer registry stream. | |
1945 | * | |
1946 | * Return 0 on success or else a negative value. | |
1947 | */ | |
1948 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
1949 | struct ust_app_stream *stream) | |
1950 | { | |
1951 | int ret; | |
1952 | ||
1953 | assert(reg_stream); | |
1954 | assert(stream); | |
1955 | ||
1956 | /* Reserve the amount of file descriptor we need. */ | |
1957 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
1958 | if (ret < 0) { | |
1959 | ERR("Exhausted number of available FD upon duplicate stream"); | |
1960 | goto error; | |
1961 | } | |
1962 | ||
1963 | /* Duplicate object for stream once the original is in the registry. */ | |
1964 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
1965 | reg_stream->obj.ust); | |
1966 | if (ret < 0) { | |
1967 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
1968 | reg_stream->obj.ust, stream->obj, ret); | |
1969 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
1970 | goto error; | |
1971 | } | |
1972 | stream->handle = stream->obj->handle; | |
1973 | ||
1974 | error: | |
1975 | return ret; | |
1976 | } | |
1977 | ||
1978 | /* | |
1979 | * Duplicate the ust data object of the ust app. channel and save it in the | |
1980 | * buffer registry channel. | |
1981 | * | |
1982 | * Return 0 on success or else a negative value. | |
1983 | */ | |
1984 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
1985 | struct ust_app_channel *ua_chan) | |
1986 | { | |
1987 | int ret; | |
1988 | ||
1989 | assert(reg_chan); | |
1990 | assert(ua_chan); | |
1991 | ||
1992 | /* Need two fds for the channel. */ | |
1993 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
1994 | if (ret < 0) { | |
1995 | ERR("Exhausted number of available FD upon duplicate channel"); | |
1996 | goto error_fd_get; | |
1997 | } | |
1998 | ||
1999 | /* Duplicate object for stream once the original is in the registry. */ | |
2000 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2001 | if (ret < 0) { | |
2002 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2003 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2004 | goto error; | |
2005 | } | |
2006 | ua_chan->handle = ua_chan->obj->handle; | |
2007 | ||
2008 | return 0; | |
2009 | ||
2010 | error: | |
2011 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2012 | error_fd_get: | |
2013 | return ret; | |
2014 | } | |
2015 | ||
2016 | /* | |
2017 | * For a given channel buffer registry, setup all streams of the given ust | |
2018 | * application channel. | |
2019 | * | |
2020 | * Return 0 on success or else a negative value. | |
2021 | */ | |
2022 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
2023 | struct ust_app_channel *ua_chan) | |
2024 | { | |
2025 | int ret = 0; | |
2026 | struct ust_app_stream *stream, *stmp; | |
2027 | ||
2028 | assert(reg_chan); | |
2029 | assert(ua_chan); | |
2030 | ||
2031 | DBG2("UST app setup buffer registry stream"); | |
2032 | ||
2033 | /* Send all streams to application. */ | |
2034 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2035 | struct buffer_reg_stream *reg_stream; | |
2036 | ||
2037 | ret = buffer_reg_stream_create(®_stream); | |
2038 | if (ret < 0) { | |
2039 | goto error; | |
2040 | } | |
2041 | ||
2042 | /* | |
2043 | * Keep original pointer and nullify it in the stream so the delete | |
2044 | * stream call does not release the object. | |
2045 | */ | |
2046 | reg_stream->obj.ust = stream->obj; | |
2047 | stream->obj = NULL; | |
2048 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2049 | |
7972aab2 DG |
2050 | /* We don't need the streams anymore. */ |
2051 | cds_list_del(&stream->list); | |
2052 | delete_ust_app_stream(-1, stream); | |
2053 | } | |
421cb601 | 2054 | |
7972aab2 DG |
2055 | error: |
2056 | return ret; | |
2057 | } | |
2058 | ||
2059 | /* | |
2060 | * Create a buffer registry channel for the given session registry and | |
2061 | * application channel object. If regp pointer is valid, it's set with the | |
2062 | * created object. Important, the created object is NOT added to the session | |
2063 | * registry hash table. | |
2064 | * | |
2065 | * Return 0 on success else a negative value. | |
2066 | */ | |
2067 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2068 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2069 | { | |
2070 | int ret; | |
2071 | struct buffer_reg_channel *reg_chan = NULL; | |
2072 | ||
2073 | assert(reg_sess); | |
2074 | assert(ua_chan); | |
2075 | ||
2076 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2077 | ||
2078 | /* Create buffer registry channel. */ | |
2079 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2080 | if (ret < 0) { | |
2081 | goto error_create; | |
421cb601 | 2082 | } |
7972aab2 DG |
2083 | assert(reg_chan); |
2084 | reg_chan->consumer_key = ua_chan->key; | |
421cb601 | 2085 | |
7972aab2 DG |
2086 | /* Create and add a channel registry to session. */ |
2087 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2088 | ua_chan->tracing_channel_id); | |
2089 | if (ret < 0) { | |
2090 | goto error; | |
d88aee68 | 2091 | } |
7972aab2 | 2092 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2093 | |
7972aab2 DG |
2094 | if (regp) { |
2095 | *regp = reg_chan; | |
3d8ca23b | 2096 | } |
d88aee68 | 2097 | |
7972aab2 | 2098 | return 0; |
3d8ca23b DG |
2099 | |
2100 | error: | |
7972aab2 DG |
2101 | /* Safe because the registry channel object was not added to any HT. */ |
2102 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2103 | error_create: | |
3d8ca23b | 2104 | return ret; |
421cb601 DG |
2105 | } |
2106 | ||
55cc08a6 | 2107 | /* |
7972aab2 DG |
2108 | * Setup buffer registry channel for the given session registry and application |
2109 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2110 | * |
7972aab2 | 2111 | * Return 0 on success else a negative value. |
55cc08a6 | 2112 | */ |
7972aab2 DG |
2113 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
2114 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan) | |
55cc08a6 | 2115 | { |
7972aab2 | 2116 | int ret; |
55cc08a6 | 2117 | |
7972aab2 DG |
2118 | assert(reg_sess); |
2119 | assert(reg_chan); | |
2120 | assert(ua_chan); | |
2121 | assert(ua_chan->obj); | |
55cc08a6 | 2122 | |
7972aab2 | 2123 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2124 | |
7972aab2 DG |
2125 | /* Setup all streams for the registry. */ |
2126 | ret = setup_buffer_reg_streams(reg_chan, ua_chan); | |
2127 | if (ret < 0) { | |
55cc08a6 DG |
2128 | goto error; |
2129 | } | |
2130 | ||
7972aab2 DG |
2131 | reg_chan->obj.ust = ua_chan->obj; |
2132 | ua_chan->obj = NULL; | |
55cc08a6 | 2133 | |
7972aab2 | 2134 | return 0; |
55cc08a6 DG |
2135 | |
2136 | error: | |
7972aab2 DG |
2137 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2138 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2139 | return ret; |
2140 | } | |
2141 | ||
edb67388 | 2142 | /* |
7972aab2 | 2143 | * Send buffer registry channel to the application. |
d0b96690 | 2144 | * |
7972aab2 | 2145 | * Return 0 on success else a negative value. |
edb67388 | 2146 | */ |
7972aab2 DG |
2147 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2148 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2149 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2150 | { |
2151 | int ret; | |
7972aab2 | 2152 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2153 | |
7972aab2 DG |
2154 | assert(reg_chan); |
2155 | assert(app); | |
2156 | assert(ua_sess); | |
2157 | assert(ua_chan); | |
2158 | ||
2159 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2160 | ||
2161 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2162 | if (ret < 0) { |
2163 | goto error; | |
2164 | } | |
2165 | ||
7972aab2 DG |
2166 | /* Send channel to the application. */ |
2167 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
2168 | if (ret < 0) { | |
2169 | goto error; | |
2170 | } | |
2171 | ||
2172 | health_code_update(); | |
2173 | ||
2174 | /* Send all streams to application. */ | |
2175 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2176 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2177 | struct ust_app_stream stream; | |
2178 | ||
2179 | ret = duplicate_stream_object(reg_stream, &stream); | |
2180 | if (ret < 0) { | |
2181 | goto error_stream_unlock; | |
2182 | } | |
2183 | ||
2184 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2185 | if (ret < 0) { | |
8c067051 | 2186 | (void) release_ust_app_stream(-1, &stream); |
7972aab2 DG |
2187 | goto error_stream_unlock; |
2188 | } | |
edb67388 | 2189 | |
7972aab2 DG |
2190 | /* |
2191 | * The return value is not important here. This function will output an | |
2192 | * error if needed. | |
2193 | */ | |
2194 | (void) release_ust_app_stream(-1, &stream); | |
2195 | } | |
2196 | ua_chan->is_sent = 1; | |
2197 | ||
2198 | error_stream_unlock: | |
2199 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2200 | error: |
2201 | return ret; | |
2202 | } | |
2203 | ||
9730260e | 2204 | /* |
7972aab2 DG |
2205 | * Create and send to the application the created buffers with per UID buffers. |
2206 | * | |
2207 | * Return 0 on success else a negative value. | |
9730260e | 2208 | */ |
7972aab2 DG |
2209 | static int create_channel_per_uid(struct ust_app *app, |
2210 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2211 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2212 | { |
2213 | int ret; | |
7972aab2 DG |
2214 | struct buffer_reg_uid *reg_uid; |
2215 | struct buffer_reg_channel *reg_chan; | |
9730260e | 2216 | |
7972aab2 DG |
2217 | assert(app); |
2218 | assert(usess); | |
2219 | assert(ua_sess); | |
2220 | assert(ua_chan); | |
2221 | ||
2222 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2223 | ||
2224 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2225 | /* | |
2226 | * The session creation handles the creation of this global registry | |
2227 | * object. If none can be find, there is a code flow problem or a | |
2228 | * teardown race. | |
2229 | */ | |
2230 | assert(reg_uid); | |
2231 | ||
2232 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2233 | reg_uid); | |
2234 | if (!reg_chan) { | |
2235 | /* Create the buffer registry channel object. */ | |
2236 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2237 | if (ret < 0) { | |
2238 | goto error; | |
2239 | } | |
2240 | assert(reg_chan); | |
2241 | ||
2242 | /* | |
2243 | * Create the buffers on the consumer side. This call populates the | |
2244 | * ust app channel object with all streams and data object. | |
2245 | */ | |
2246 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2247 | app->bits_per_long, reg_uid->registry->reg.ust); | |
2248 | if (ret < 0) { | |
2249 | goto error; | |
2250 | } | |
2251 | ||
2252 | /* | |
2253 | * Setup the streams and add it to the session registry. | |
2254 | */ | |
2255 | ret = setup_buffer_reg_channel(reg_uid->registry, ua_chan, reg_chan); | |
2256 | if (ret < 0) { | |
2257 | goto error; | |
2258 | } | |
2259 | ||
2260 | } | |
2261 | ||
2262 | /* Send buffers to the application. */ | |
2263 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
9730260e DG |
2264 | if (ret < 0) { |
2265 | goto error; | |
2266 | } | |
2267 | ||
9730260e DG |
2268 | error: |
2269 | return ret; | |
2270 | } | |
2271 | ||
78f0bacd | 2272 | /* |
7972aab2 DG |
2273 | * Create and send to the application the created buffers with per PID buffers. |
2274 | * | |
2275 | * Return 0 on success else a negative value. | |
78f0bacd | 2276 | */ |
7972aab2 DG |
2277 | static int create_channel_per_pid(struct ust_app *app, |
2278 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2279 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2280 | { |
8535a6d9 | 2281 | int ret; |
7972aab2 | 2282 | struct ust_registry_session *registry; |
78f0bacd | 2283 | |
7972aab2 DG |
2284 | assert(app); |
2285 | assert(usess); | |
2286 | assert(ua_sess); | |
2287 | assert(ua_chan); | |
2288 | ||
2289 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2290 | ||
2291 | rcu_read_lock(); | |
2292 | ||
2293 | registry = get_session_registry(ua_sess); | |
2294 | assert(registry); | |
2295 | ||
2296 | /* Create and add a new channel registry to session. */ | |
2297 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd DG |
2298 | if (ret < 0) { |
2299 | goto error; | |
2300 | } | |
2301 | ||
7972aab2 DG |
2302 | /* Create and get channel on the consumer side. */ |
2303 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2304 | app->bits_per_long, registry); | |
2305 | if (ret < 0) { | |
2306 | goto error; | |
2307 | } | |
2308 | ||
2309 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
2310 | if (ret < 0) { | |
2311 | goto error; | |
2312 | } | |
8535a6d9 | 2313 | |
78f0bacd | 2314 | error: |
7972aab2 | 2315 | rcu_read_unlock(); |
78f0bacd DG |
2316 | return ret; |
2317 | } | |
2318 | ||
2319 | /* | |
7972aab2 DG |
2320 | * From an already allocated ust app channel, create the channel buffers if |
2321 | * need and send it to the application. This MUST be called with a RCU read | |
2322 | * side lock acquired. | |
2323 | * | |
2324 | * Return 0 on success or else a negative value. | |
78f0bacd | 2325 | */ |
7972aab2 DG |
2326 | static int do_create_channel(struct ust_app *app, |
2327 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2328 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2329 | { |
7972aab2 | 2330 | int ret; |
78f0bacd | 2331 | |
7972aab2 DG |
2332 | assert(app); |
2333 | assert(usess); | |
2334 | assert(ua_sess); | |
2335 | assert(ua_chan); | |
2336 | ||
2337 | /* Handle buffer type before sending the channel to the application. */ | |
2338 | switch (usess->buffer_type) { | |
2339 | case LTTNG_BUFFER_PER_UID: | |
2340 | { | |
2341 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
2342 | if (ret < 0) { | |
2343 | goto error; | |
2344 | } | |
2345 | break; | |
2346 | } | |
2347 | case LTTNG_BUFFER_PER_PID: | |
2348 | { | |
2349 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
2350 | if (ret < 0) { | |
2351 | goto error; | |
2352 | } | |
2353 | break; | |
2354 | } | |
2355 | default: | |
2356 | assert(0); | |
2357 | ret = -EINVAL; | |
78f0bacd DG |
2358 | goto error; |
2359 | } | |
2360 | ||
7972aab2 DG |
2361 | /* Initialize ust objd object using the received handle and add it. */ |
2362 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
2363 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 2364 | |
7972aab2 DG |
2365 | /* If channel is not enabled, disable it on the tracer */ |
2366 | if (!ua_chan->enabled) { | |
2367 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2368 | if (ret < 0) { | |
2369 | goto error; | |
2370 | } | |
78f0bacd DG |
2371 | } |
2372 | ||
2373 | error: | |
2374 | return ret; | |
2375 | } | |
2376 | ||
284d8f55 | 2377 | /* |
4d710ac2 DG |
2378 | * Create UST app channel and create it on the tracer. Set ua_chanp of the |
2379 | * newly created channel if not NULL. | |
d0b96690 | 2380 | * |
36b588ed | 2381 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 DG |
2382 | * |
2383 | * Return 0 on success or else a negative value. | |
284d8f55 | 2384 | */ |
4d710ac2 DG |
2385 | static int create_ust_app_channel(struct ust_app_session *ua_sess, |
2386 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
7972aab2 | 2387 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 2388 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
2389 | { |
2390 | int ret = 0; | |
bec39940 DG |
2391 | struct lttng_ht_iter iter; |
2392 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
2393 | struct ust_app_channel *ua_chan; |
2394 | ||
2395 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
2396 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
2397 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 2398 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 2399 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 2400 | goto end; |
5b4a0ec0 DG |
2401 | } |
2402 | ||
d0b96690 | 2403 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
2404 | if (ua_chan == NULL) { |
2405 | /* Only malloc can fail here */ | |
4d710ac2 | 2406 | ret = -ENOMEM; |
fc34caaa DG |
2407 | goto error; |
2408 | } | |
2409 | shadow_copy_channel(ua_chan, uchan); | |
2410 | ||
ffe60014 DG |
2411 | /* Set channel type. */ |
2412 | ua_chan->attr.type = type; | |
2413 | ||
7972aab2 | 2414 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
5b4a0ec0 DG |
2415 | if (ret < 0) { |
2416 | goto error; | |
2417 | } | |
2418 | ||
fc34caaa | 2419 | DBG2("UST app create channel %s for PID %d completed", ua_chan->name, |
852d0037 | 2420 | app->pid); |
fc34caaa | 2421 | |
d0b96690 DG |
2422 | /* Only add the channel if successful on the tracer side. */ |
2423 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
2424 | ||
fc34caaa | 2425 | end: |
4d710ac2 DG |
2426 | if (ua_chanp) { |
2427 | *ua_chanp = ua_chan; | |
2428 | } | |
2429 | ||
2430 | /* Everything went well. */ | |
2431 | return 0; | |
5b4a0ec0 DG |
2432 | |
2433 | error: | |
d0b96690 | 2434 | delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app); |
4d710ac2 | 2435 | return ret; |
5b4a0ec0 DG |
2436 | } |
2437 | ||
2438 | /* | |
2439 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
2440 | * |
2441 | * Called with ust app session mutex held. | |
5b4a0ec0 | 2442 | */ |
edb67388 DG |
2443 | static |
2444 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
2445 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
2446 | struct ust_app *app) | |
284d8f55 | 2447 | { |
edb67388 | 2448 | int ret = 0; |
5b4a0ec0 | 2449 | struct ust_app_event *ua_event; |
284d8f55 | 2450 | |
5b4a0ec0 | 2451 | /* Get event node */ |
18eace3b DG |
2452 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
2453 | uevent->filter, uevent->attr.loglevel); | |
2454 | if (ua_event != NULL) { | |
fc34caaa | 2455 | ret = -EEXIST; |
edb67388 DG |
2456 | goto end; |
2457 | } | |
5b4a0ec0 | 2458 | |
edb67388 DG |
2459 | /* Does not exist so create one */ |
2460 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); | |
2461 | if (ua_event == NULL) { | |
2462 | /* Only malloc can failed so something is really wrong */ | |
2463 | ret = -ENOMEM; | |
fc34caaa | 2464 | goto end; |
5b4a0ec0 | 2465 | } |
edb67388 | 2466 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 2467 | |
edb67388 | 2468 | /* Create it on the tracer side */ |
5b4a0ec0 | 2469 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 2470 | if (ret < 0) { |
fc34caaa | 2471 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 2472 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
2473 | goto error; |
2474 | } | |
2475 | ||
d0b96690 | 2476 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 2477 | |
fc34caaa | 2478 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 2479 | app->pid); |
7f79d3a1 | 2480 | |
edb67388 | 2481 | end: |
fc34caaa DG |
2482 | return ret; |
2483 | ||
5b4a0ec0 | 2484 | error: |
fc34caaa DG |
2485 | /* Valid. Calling here is already in a read side lock */ |
2486 | delete_ust_app_event(-1, ua_event); | |
edb67388 | 2487 | return ret; |
5b4a0ec0 DG |
2488 | } |
2489 | ||
2490 | /* | |
2491 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 2492 | * |
7972aab2 | 2493 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
2494 | */ |
2495 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
d65d2de8 DG |
2496 | struct ust_app *app, struct consumer_output *consumer, |
2497 | struct ustctl_consumer_channel_attr *attr) | |
5b4a0ec0 DG |
2498 | { |
2499 | int ret = 0; | |
ffe60014 | 2500 | struct ust_app_channel *metadata; |
d88aee68 | 2501 | struct consumer_socket *socket; |
7972aab2 | 2502 | struct ust_registry_session *registry; |
5b4a0ec0 | 2503 | |
ffe60014 DG |
2504 | assert(ua_sess); |
2505 | assert(app); | |
d88aee68 | 2506 | assert(consumer); |
5b4a0ec0 | 2507 | |
7972aab2 DG |
2508 | registry = get_session_registry(ua_sess); |
2509 | assert(registry); | |
2510 | ||
2511 | /* Metadata already exists for this registry. */ | |
2512 | if (registry->metadata_key) { | |
2513 | ret = 0; | |
2514 | goto error; | |
5b4a0ec0 DG |
2515 | } |
2516 | ||
ffe60014 | 2517 | /* Allocate UST metadata */ |
d0b96690 | 2518 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
2519 | if (!metadata) { |
2520 | /* malloc() failed */ | |
2521 | ret = -ENOMEM; | |
2522 | goto error; | |
2523 | } | |
5b4a0ec0 | 2524 | |
d65d2de8 DG |
2525 | if (!attr) { |
2526 | /* Set default attributes for metadata. */ | |
2527 | metadata->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
2528 | metadata->attr.subbuf_size = default_get_metadata_subbuf_size(); | |
2529 | metadata->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM; | |
0a9c6494 DG |
2530 | metadata->attr.switch_timer_interval = DEFAULT_METADATA_SWITCH_TIMER; |
2531 | metadata->attr.read_timer_interval = DEFAULT_METADATA_READ_TIMER; | |
d65d2de8 DG |
2532 | metadata->attr.output = LTTNG_UST_MMAP; |
2533 | metadata->attr.type = LTTNG_UST_CHAN_METADATA; | |
2534 | } else { | |
2535 | memcpy(&metadata->attr, attr, sizeof(metadata->attr)); | |
2536 | metadata->attr.output = LTTNG_UST_MMAP; | |
2537 | metadata->attr.type = LTTNG_UST_CHAN_METADATA; | |
2538 | } | |
5b4a0ec0 | 2539 | |
7972aab2 DG |
2540 | /* Need one fd for the channel. */ |
2541 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2542 | if (ret < 0) { | |
2543 | ERR("Exhausted number of available FD upon create metadata"); | |
2544 | goto error; | |
2545 | } | |
2546 | ||
4dc3dfc5 DG |
2547 | /* Get the right consumer socket for the application. */ |
2548 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
2549 | if (!socket) { | |
2550 | ret = -EINVAL; | |
2551 | goto error_consumer; | |
2552 | } | |
2553 | ||
331744e3 JD |
2554 | /* |
2555 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
2556 | * to the registry *before* we ask the consumer so we avoid the race of the | |
2557 | * consumer requesting the metadata and the ask_channel call on our side | |
2558 | * did not returned yet. | |
2559 | */ | |
2560 | registry->metadata_key = metadata->key; | |
2561 | ||
d88aee68 DG |
2562 | /* |
2563 | * Ask the metadata channel creation to the consumer. The metadata object | |
2564 | * will be created by the consumer and kept their. However, the stream is | |
2565 | * never added or monitored until we do a first push metadata to the | |
2566 | * consumer. | |
2567 | */ | |
7972aab2 DG |
2568 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
2569 | registry); | |
d88aee68 | 2570 | if (ret < 0) { |
7972aab2 DG |
2571 | /* |
2572 | * Safe because the metadata obj pointer is not set so the delete below | |
2573 | * will not put a FD back again. | |
2574 | */ | |
d88aee68 DG |
2575 | goto error_consumer; |
2576 | } | |
2577 | ||
2578 | /* | |
2579 | * The setup command will make the metadata stream be sent to the relayd, | |
2580 | * if applicable, and the thread managing the metadatas. This is important | |
2581 | * because after this point, if an error occurs, the only way the stream | |
2582 | * can be deleted is to be monitored in the consumer. | |
2583 | */ | |
7972aab2 | 2584 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 2585 | if (ret < 0) { |
7972aab2 DG |
2586 | /* |
2587 | * Safe because the metadata obj pointer is not set so the delete below | |
2588 | * will not put a FD back again. | |
2589 | */ | |
d88aee68 | 2590 | goto error_consumer; |
5b4a0ec0 DG |
2591 | } |
2592 | ||
7972aab2 DG |
2593 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
2594 | metadata->key, app->pid); | |
5b4a0ec0 | 2595 | |
d88aee68 | 2596 | error_consumer: |
b80f0b6c | 2597 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 2598 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 2599 | error: |
ffe60014 | 2600 | return ret; |
5b4a0ec0 DG |
2601 | } |
2602 | ||
2603 | /* | |
2604 | * Return pointer to traceable apps list. | |
2605 | */ | |
bec39940 | 2606 | struct lttng_ht *ust_app_get_ht(void) |
5b4a0ec0 DG |
2607 | { |
2608 | return ust_app_ht; | |
2609 | } | |
2610 | ||
2611 | /* | |
d88aee68 DG |
2612 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
2613 | * acquired before calling this function. | |
5b4a0ec0 DG |
2614 | */ |
2615 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
2616 | { | |
d88aee68 | 2617 | struct ust_app *app = NULL; |
bec39940 DG |
2618 | struct lttng_ht_node_ulong *node; |
2619 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 2620 | |
bec39940 DG |
2621 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
2622 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
2623 | if (node == NULL) { |
2624 | DBG2("UST app no found with pid %d", pid); | |
2625 | goto error; | |
2626 | } | |
5b4a0ec0 DG |
2627 | |
2628 | DBG2("Found UST app by pid %d", pid); | |
2629 | ||
d88aee68 | 2630 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
2631 | |
2632 | error: | |
d88aee68 | 2633 | return app; |
5b4a0ec0 DG |
2634 | } |
2635 | ||
d88aee68 DG |
2636 | /* |
2637 | * Allocate and init an UST app object using the registration information and | |
2638 | * the command socket. This is called when the command socket connects to the | |
2639 | * session daemon. | |
2640 | * | |
2641 | * The object is returned on success or else NULL. | |
2642 | */ | |
d0b96690 | 2643 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 2644 | { |
d0b96690 DG |
2645 | struct ust_app *lta = NULL; |
2646 | ||
2647 | assert(msg); | |
2648 | assert(sock >= 0); | |
2649 | ||
2650 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 2651 | |
173af62f DG |
2652 | if ((msg->bits_per_long == 64 && |
2653 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
2654 | || (msg->bits_per_long == 32 && | |
2655 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 2656 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
2657 | "%d-bit long, but no consumerd for this size is available.\n", |
2658 | msg->name, msg->pid, msg->bits_per_long); | |
2659 | goto error; | |
3f2c5fcc | 2660 | } |
d0b96690 | 2661 | |
5b4a0ec0 DG |
2662 | lta = zmalloc(sizeof(struct ust_app)); |
2663 | if (lta == NULL) { | |
2664 | PERROR("malloc"); | |
d0b96690 | 2665 | goto error; |
5b4a0ec0 DG |
2666 | } |
2667 | ||
2668 | lta->ppid = msg->ppid; | |
2669 | lta->uid = msg->uid; | |
2670 | lta->gid = msg->gid; | |
d0b96690 | 2671 | |
7753dea8 | 2672 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
2673 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
2674 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
2675 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
2676 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
2677 | lta->long_alignment = msg->long_alignment; | |
2678 | lta->byte_order = msg->byte_order; | |
2679 | ||
5b4a0ec0 DG |
2680 | lta->v_major = msg->major; |
2681 | lta->v_minor = msg->minor; | |
bec39940 | 2682 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 DG |
2683 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
2684 | lta->notify_sock = -1; | |
d88aee68 DG |
2685 | |
2686 | /* Copy name and make sure it's NULL terminated. */ | |
2687 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
2688 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
2689 | ||
2690 | /* | |
2691 | * Before this can be called, when receiving the registration information, | |
2692 | * the application compatibility is checked. So, at this point, the | |
2693 | * application can work with this session daemon. | |
2694 | */ | |
d0b96690 | 2695 | lta->compatible = 1; |
5b4a0ec0 | 2696 | |
852d0037 | 2697 | lta->pid = msg->pid; |
d0b96690 | 2698 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 2699 | lta->sock = sock; |
d0b96690 | 2700 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 2701 | |
d42f20df DG |
2702 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
2703 | ||
d0b96690 DG |
2704 | error: |
2705 | return lta; | |
2706 | } | |
2707 | ||
d88aee68 DG |
2708 | /* |
2709 | * For a given application object, add it to every hash table. | |
2710 | */ | |
d0b96690 DG |
2711 | void ust_app_add(struct ust_app *app) |
2712 | { | |
2713 | assert(app); | |
2714 | assert(app->notify_sock >= 0); | |
2715 | ||
5b4a0ec0 | 2716 | rcu_read_lock(); |
852d0037 DG |
2717 | |
2718 | /* | |
2719 | * On a re-registration, we want to kick out the previous registration of | |
2720 | * that pid | |
2721 | */ | |
d0b96690 | 2722 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
2723 | |
2724 | /* | |
2725 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
2726 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
2727 | * already in the table. | |
2728 | */ | |
d0b96690 | 2729 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 2730 | |
d0b96690 DG |
2731 | /* Add application to the notify socket hash table. */ |
2732 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
2733 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 2734 | |
d0b96690 | 2735 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
2736 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
2737 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
2738 | app->v_minor); | |
5b4a0ec0 | 2739 | |
d0b96690 DG |
2740 | rcu_read_unlock(); |
2741 | } | |
2742 | ||
d88aee68 DG |
2743 | /* |
2744 | * Set the application version into the object. | |
2745 | * | |
2746 | * Return 0 on success else a negative value either an errno code or a | |
2747 | * LTTng-UST error code. | |
2748 | */ | |
d0b96690 DG |
2749 | int ust_app_version(struct ust_app *app) |
2750 | { | |
d88aee68 DG |
2751 | int ret; |
2752 | ||
d0b96690 | 2753 | assert(app); |
d88aee68 DG |
2754 | |
2755 | ret = ustctl_tracer_version(app->sock, &app->version); | |
2756 | if (ret < 0) { | |
2757 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
2758 | ERR("UST app %d verson failed with ret %d", app->sock, ret); | |
2759 | } else { | |
2760 | DBG3("UST app %d verion failed. Application is dead", app->sock); | |
2761 | } | |
2762 | } | |
2763 | ||
2764 | return ret; | |
5b4a0ec0 DG |
2765 | } |
2766 | ||
2767 | /* | |
2768 | * Unregister app by removing it from the global traceable app list and freeing | |
2769 | * the data struct. | |
2770 | * | |
2771 | * The socket is already closed at this point so no close to sock. | |
2772 | */ | |
2773 | void ust_app_unregister(int sock) | |
2774 | { | |
2775 | struct ust_app *lta; | |
bec39940 DG |
2776 | struct lttng_ht_node_ulong *node; |
2777 | struct lttng_ht_iter iter; | |
d42f20df | 2778 | struct ust_app_session *ua_sess; |
525b0740 | 2779 | int ret; |
5b4a0ec0 DG |
2780 | |
2781 | rcu_read_lock(); | |
886459c6 | 2782 | |
5b4a0ec0 | 2783 | /* Get the node reference for a call_rcu */ |
852d0037 | 2784 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 2785 | node = lttng_ht_iter_get_node_ulong(&iter); |
d0b96690 | 2786 | assert(node); |
284d8f55 | 2787 | |
852d0037 | 2788 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
2789 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
2790 | ||
886459c6 | 2791 | /* Remove application from PID hash table */ |
852d0037 DG |
2792 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
2793 | assert(!ret); | |
2794 | ||
d88aee68 DG |
2795 | /* |
2796 | * Remove application from notify hash table. The thread handling the | |
2797 | * notify socket could have deleted the node so ignore on error because | |
2798 | * either way it's valid. The close of that socket is handled by the other | |
2799 | * thread. | |
2800 | */ | |
d0b96690 | 2801 | iter.iter.node = <a->notify_sock_n.node; |
d88aee68 | 2802 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); |
852d0037 | 2803 | |
5b98a774 DG |
2804 | /* |
2805 | * Ignore return value since the node might have been removed before by an | |
2806 | * add replace during app registration because the PID can be reassigned by | |
2807 | * the OS. | |
2808 | */ | |
d0b96690 | 2809 | iter.iter.node = <a->pid_n.node; |
bec39940 | 2810 | ret = lttng_ht_del(ust_app_ht, &iter); |
5b98a774 DG |
2811 | if (ret) { |
2812 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
2813 | lta->pid); | |
2814 | } | |
852d0037 | 2815 | |
d42f20df DG |
2816 | /* Remove sessions so they are not visible during deletion.*/ |
2817 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, | |
2818 | node.node) { | |
7972aab2 DG |
2819 | struct ust_registry_session *registry; |
2820 | ||
d42f20df DG |
2821 | ret = lttng_ht_del(lta->sessions, &iter); |
2822 | if (ret) { | |
2823 | /* The session was already removed so scheduled for teardown. */ | |
2824 | continue; | |
2825 | } | |
2826 | ||
2827 | /* | |
2828 | * Add session to list for teardown. This is safe since at this point we | |
2829 | * are the only one using this list. | |
2830 | */ | |
d88aee68 DG |
2831 | pthread_mutex_lock(&ua_sess->lock); |
2832 | ||
2833 | /* | |
2834 | * Normally, this is done in the delete session process which is | |
2835 | * executed in the call rcu below. However, upon registration we can't | |
2836 | * afford to wait for the grace period before pushing data or else the | |
2837 | * data pending feature can race between the unregistration and stop | |
2838 | * command where the data pending command is sent *before* the grace | |
2839 | * period ended. | |
2840 | * | |
2841 | * The close metadata below nullifies the metadata pointer in the | |
2842 | * session so the delete session will NOT push/close a second time. | |
2843 | */ | |
7972aab2 DG |
2844 | registry = get_session_registry(ua_sess); |
2845 | if (registry) { | |
2846 | /* Push metadata for application before freeing the application. */ | |
2847 | (void) push_metadata(registry, ua_sess->consumer); | |
2848 | ||
2849 | /* | |
2850 | * Don't ask to close metadata for global per UID buffers. Close | |
2851 | * metadata only on destroy trace session in this case. | |
2852 | */ | |
2853 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { | |
2854 | /* And ask to close it for this session registry. */ | |
2855 | (void) close_metadata(registry, ua_sess->consumer); | |
2856 | } | |
2857 | } | |
d88aee68 | 2858 | |
d42f20df | 2859 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
d88aee68 | 2860 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
2861 | } |
2862 | ||
852d0037 DG |
2863 | /* Free memory */ |
2864 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
2865 | ||
5b4a0ec0 DG |
2866 | rcu_read_unlock(); |
2867 | return; | |
284d8f55 DG |
2868 | } |
2869 | ||
2870 | /* | |
5b4a0ec0 | 2871 | * Return traceable_app_count |
284d8f55 | 2872 | */ |
5b4a0ec0 | 2873 | unsigned long ust_app_list_count(void) |
284d8f55 | 2874 | { |
5b4a0ec0 | 2875 | unsigned long count; |
284d8f55 | 2876 | |
5b4a0ec0 | 2877 | rcu_read_lock(); |
bec39940 | 2878 | count = lttng_ht_get_count(ust_app_ht); |
5b4a0ec0 | 2879 | rcu_read_unlock(); |
284d8f55 | 2880 | |
5b4a0ec0 | 2881 | return count; |
284d8f55 DG |
2882 | } |
2883 | ||
5b4a0ec0 DG |
2884 | /* |
2885 | * Fill events array with all events name of all registered apps. | |
2886 | */ | |
2887 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 2888 | { |
5b4a0ec0 DG |
2889 | int ret, handle; |
2890 | size_t nbmem, count = 0; | |
bec39940 | 2891 | struct lttng_ht_iter iter; |
5b4a0ec0 | 2892 | struct ust_app *app; |
c617c0c6 | 2893 | struct lttng_event *tmp_event; |
421cb601 | 2894 | |
5b4a0ec0 | 2895 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
2896 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
2897 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
2898 | PERROR("zmalloc ust app events"); |
2899 | ret = -ENOMEM; | |
421cb601 DG |
2900 | goto error; |
2901 | } | |
2902 | ||
5b4a0ec0 | 2903 | rcu_read_lock(); |
421cb601 | 2904 | |
852d0037 | 2905 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 2906 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 2907 | |
840cb59c | 2908 | health_code_update(); |
86acf0da | 2909 | |
e0c7ec2b DG |
2910 | if (!app->compatible) { |
2911 | /* | |
2912 | * TODO: In time, we should notice the caller of this error by | |
2913 | * telling him that this is a version error. | |
2914 | */ | |
2915 | continue; | |
2916 | } | |
852d0037 | 2917 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 2918 | if (handle < 0) { |
ffe60014 DG |
2919 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
2920 | ERR("UST app list events getting handle failed for app pid %d", | |
2921 | app->pid); | |
2922 | } | |
5b4a0ec0 DG |
2923 | continue; |
2924 | } | |
421cb601 | 2925 | |
852d0037 | 2926 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 2927 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
2928 | /* Handle ustctl error. */ |
2929 | if (ret < 0) { | |
2930 | free(tmp_event); | |
2931 | if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) { | |
2932 | ERR("UST app tp list get failed for app %d with ret %d", | |
2933 | app->sock, ret); | |
2934 | } else { | |
2935 | DBG3("UST app tp list get failed. Application is dead"); | |
2936 | } | |
2937 | goto rcu_error; | |
2938 | } | |
2939 | ||
840cb59c | 2940 | health_code_update(); |
815564d8 | 2941 | if (count >= nbmem) { |
d7b3776f | 2942 | /* In case the realloc fails, we free the memory */ |
c617c0c6 MD |
2943 | void *ptr; |
2944 | ||
815564d8 MD |
2945 | DBG2("Reallocating event list from %zu to %zu entries", nbmem, |
2946 | 2 * nbmem); | |
2947 | nbmem *= 2; | |
c617c0c6 MD |
2948 | ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event)); |
2949 | if (ptr == NULL) { | |
5b4a0ec0 | 2950 | PERROR("realloc ust app events"); |
c617c0c6 | 2951 | free(tmp_event); |
5b4a0ec0 DG |
2952 | ret = -ENOMEM; |
2953 | goto rcu_error; | |
2954 | } | |
c617c0c6 | 2955 | tmp_event = ptr; |
5b4a0ec0 | 2956 | } |
c617c0c6 MD |
2957 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
2958 | tmp_event[count].loglevel = uiter.loglevel; | |
2959 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
2960 | tmp_event[count].pid = app->pid; | |
2961 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 2962 | count++; |
421cb601 | 2963 | } |
421cb601 DG |
2964 | } |
2965 | ||
5b4a0ec0 | 2966 | ret = count; |
c617c0c6 | 2967 | *events = tmp_event; |
421cb601 | 2968 | |
5b4a0ec0 | 2969 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 2970 | |
5b4a0ec0 DG |
2971 | rcu_error: |
2972 | rcu_read_unlock(); | |
421cb601 | 2973 | error: |
840cb59c | 2974 | health_code_update(); |
5b4a0ec0 | 2975 | return ret; |
421cb601 DG |
2976 | } |
2977 | ||
f37d259d MD |
2978 | /* |
2979 | * Fill events array with all events name of all registered apps. | |
2980 | */ | |
2981 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
2982 | { | |
2983 | int ret, handle; | |
2984 | size_t nbmem, count = 0; | |
2985 | struct lttng_ht_iter iter; | |
2986 | struct ust_app *app; | |
c617c0c6 | 2987 | struct lttng_event_field *tmp_event; |
f37d259d MD |
2988 | |
2989 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
2990 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
2991 | if (tmp_event == NULL) { | |
f37d259d MD |
2992 | PERROR("zmalloc ust app event fields"); |
2993 | ret = -ENOMEM; | |
2994 | goto error; | |
2995 | } | |
2996 | ||
2997 | rcu_read_lock(); | |
2998 | ||
2999 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3000 | struct lttng_ust_field_iter uiter; | |
3001 | ||
840cb59c | 3002 | health_code_update(); |
86acf0da | 3003 | |
f37d259d MD |
3004 | if (!app->compatible) { |
3005 | /* | |
3006 | * TODO: In time, we should notice the caller of this error by | |
3007 | * telling him that this is a version error. | |
3008 | */ | |
3009 | continue; | |
3010 | } | |
3011 | handle = ustctl_tracepoint_field_list(app->sock); | |
3012 | if (handle < 0) { | |
ffe60014 DG |
3013 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3014 | ERR("UST app list field getting handle failed for app pid %d", | |
3015 | app->pid); | |
3016 | } | |
f37d259d MD |
3017 | continue; |
3018 | } | |
3019 | ||
3020 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 3021 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3022 | /* Handle ustctl error. */ |
3023 | if (ret < 0) { | |
3024 | free(tmp_event); | |
3025 | if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) { | |
3026 | ERR("UST app tp list field failed for app %d with ret %d", | |
3027 | app->sock, ret); | |
3028 | } else { | |
3029 | DBG3("UST app tp list field failed. Application is dead"); | |
3030 | } | |
3031 | goto rcu_error; | |
3032 | } | |
3033 | ||
840cb59c | 3034 | health_code_update(); |
f37d259d | 3035 | if (count >= nbmem) { |
d7b3776f | 3036 | /* In case the realloc fails, we free the memory */ |
c617c0c6 MD |
3037 | void *ptr; |
3038 | ||
f37d259d MD |
3039 | DBG2("Reallocating event field list from %zu to %zu entries", nbmem, |
3040 | 2 * nbmem); | |
3041 | nbmem *= 2; | |
c617c0c6 MD |
3042 | ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event_field)); |
3043 | if (ptr == NULL) { | |
f37d259d | 3044 | PERROR("realloc ust app event fields"); |
c617c0c6 | 3045 | free(tmp_event); |
f37d259d MD |
3046 | ret = -ENOMEM; |
3047 | goto rcu_error; | |
3048 | } | |
c617c0c6 | 3049 | tmp_event = ptr; |
f37d259d | 3050 | } |
f37d259d | 3051 | |
c617c0c6 MD |
3052 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
3053 | tmp_event[count].type = uiter.type; | |
3054 | tmp_event[count].nowrite = uiter.nowrite; | |
f37d259d | 3055 | |
c617c0c6 MD |
3056 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
3057 | tmp_event[count].event.loglevel = uiter.loglevel; | |
3058 | tmp_event[count].event.type = LTTNG_UST_TRACEPOINT; | |
3059 | tmp_event[count].event.pid = app->pid; | |
3060 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
3061 | count++; |
3062 | } | |
3063 | } | |
3064 | ||
3065 | ret = count; | |
c617c0c6 | 3066 | *fields = tmp_event; |
f37d259d MD |
3067 | |
3068 | DBG2("UST app list event fields done (%zu events)", count); | |
3069 | ||
3070 | rcu_error: | |
3071 | rcu_read_unlock(); | |
3072 | error: | |
840cb59c | 3073 | health_code_update(); |
f37d259d MD |
3074 | return ret; |
3075 | } | |
3076 | ||
5b4a0ec0 DG |
3077 | /* |
3078 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
3079 | * |
3080 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
3081 | */ |
3082 | void ust_app_clean_list(void) | |
421cb601 | 3083 | { |
5b4a0ec0 | 3084 | int ret; |
659ed79f | 3085 | struct ust_app *app; |
bec39940 | 3086 | struct lttng_ht_iter iter; |
421cb601 | 3087 | |
5b4a0ec0 | 3088 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3089 | |
5b4a0ec0 | 3090 | rcu_read_lock(); |
421cb601 | 3091 | |
659ed79f | 3092 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3093 | ret = lttng_ht_del(ust_app_ht, &iter); |
525b0740 | 3094 | assert(!ret); |
659ed79f | 3095 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); |
421cb601 DG |
3096 | } |
3097 | ||
852d0037 | 3098 | /* Cleanup socket hash table */ |
659ed79f DG |
3099 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, |
3100 | sock_n.node) { | |
852d0037 | 3101 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
bec39940 DG |
3102 | assert(!ret); |
3103 | } | |
852d0037 | 3104 | |
d88aee68 DG |
3105 | /* Cleanup notify socket hash table */ |
3106 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3107 | notify_sock_n.node) { | |
3108 | ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3109 | assert(!ret); | |
3110 | } | |
36b588ed | 3111 | rcu_read_unlock(); |
d88aee68 | 3112 | |
bec39940 | 3113 | /* Destroy is done only when the ht is empty */ |
852d0037 DG |
3114 | lttng_ht_destroy(ust_app_ht); |
3115 | lttng_ht_destroy(ust_app_ht_by_sock); | |
d88aee68 | 3116 | lttng_ht_destroy(ust_app_ht_by_notify_sock); |
5b4a0ec0 DG |
3117 | } |
3118 | ||
3119 | /* | |
3120 | * Init UST app hash table. | |
3121 | */ | |
3122 | void ust_app_ht_alloc(void) | |
3123 | { | |
bec39940 | 3124 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
852d0037 | 3125 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3126 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
421cb601 DG |
3127 | } |
3128 | ||
78f0bacd DG |
3129 | /* |
3130 | * For a specific UST session, disable the channel for all registered apps. | |
3131 | */ | |
35a9059d | 3132 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3133 | struct ltt_ust_channel *uchan) |
3134 | { | |
3135 | int ret = 0; | |
bec39940 DG |
3136 | struct lttng_ht_iter iter; |
3137 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3138 | struct ust_app *app; |
3139 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3140 | struct ust_app_channel *ua_chan; |
78f0bacd DG |
3141 | |
3142 | if (usess == NULL || uchan == NULL) { | |
3143 | ERR("Disabling UST global channel with NULL values"); | |
3144 | ret = -1; | |
3145 | goto error; | |
3146 | } | |
3147 | ||
a991f516 MD |
3148 | DBG2("UST app disabling channel %s from global domain for session id %d", |
3149 | uchan->name, usess->id); | |
78f0bacd DG |
3150 | |
3151 | rcu_read_lock(); | |
3152 | ||
3153 | /* For every registered applications */ | |
852d0037 | 3154 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3155 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3156 | if (!app->compatible) { |
3157 | /* | |
3158 | * TODO: In time, we should notice the caller of this error by | |
3159 | * telling him that this is a version error. | |
3160 | */ | |
3161 | continue; | |
3162 | } | |
78f0bacd DG |
3163 | ua_sess = lookup_session_by_app(usess, app); |
3164 | if (ua_sess == NULL) { | |
3165 | continue; | |
3166 | } | |
3167 | ||
8535a6d9 | 3168 | /* Get channel */ |
bec39940 DG |
3169 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3170 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
3171 | /* If the session if found for the app, the channel must be there */ |
3172 | assert(ua_chan_node); | |
3173 | ||
3174 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3175 | /* The channel must not be already disabled */ | |
3176 | assert(ua_chan->enabled == 1); | |
3177 | ||
3178 | /* Disable channel onto application */ | |
3179 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
3180 | if (ret < 0) { |
3181 | /* XXX: We might want to report this error at some point... */ | |
3182 | continue; | |
3183 | } | |
3184 | } | |
3185 | ||
3186 | rcu_read_unlock(); | |
3187 | ||
3188 | error: | |
3189 | return ret; | |
3190 | } | |
3191 | ||
3192 | /* | |
3193 | * For a specific UST session, enable the channel for all registered apps. | |
3194 | */ | |
35a9059d | 3195 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3196 | struct ltt_ust_channel *uchan) |
3197 | { | |
3198 | int ret = 0; | |
bec39940 | 3199 | struct lttng_ht_iter iter; |
78f0bacd DG |
3200 | struct ust_app *app; |
3201 | struct ust_app_session *ua_sess; | |
3202 | ||
3203 | if (usess == NULL || uchan == NULL) { | |
3204 | ERR("Adding UST global channel to NULL values"); | |
3205 | ret = -1; | |
3206 | goto error; | |
3207 | } | |
3208 | ||
a991f516 MD |
3209 | DBG2("UST app enabling channel %s to global domain for session id %d", |
3210 | uchan->name, usess->id); | |
78f0bacd DG |
3211 | |
3212 | rcu_read_lock(); | |
3213 | ||
3214 | /* For every registered applications */ | |
852d0037 | 3215 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3216 | if (!app->compatible) { |
3217 | /* | |
3218 | * TODO: In time, we should notice the caller of this error by | |
3219 | * telling him that this is a version error. | |
3220 | */ | |
3221 | continue; | |
3222 | } | |
78f0bacd DG |
3223 | ua_sess = lookup_session_by_app(usess, app); |
3224 | if (ua_sess == NULL) { | |
3225 | continue; | |
3226 | } | |
3227 | ||
3228 | /* Enable channel onto application */ | |
3229 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
3230 | if (ret < 0) { | |
3231 | /* XXX: We might want to report this error at some point... */ | |
3232 | continue; | |
3233 | } | |
3234 | } | |
3235 | ||
3236 | rcu_read_unlock(); | |
3237 | ||
3238 | error: | |
3239 | return ret; | |
3240 | } | |
3241 | ||
b0a40d28 DG |
3242 | /* |
3243 | * Disable an event in a channel and for a specific session. | |
3244 | */ | |
35a9059d DG |
3245 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
3246 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
3247 | { |
3248 | int ret = 0; | |
bec39940 DG |
3249 | struct lttng_ht_iter iter, uiter; |
3250 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
b0a40d28 DG |
3251 | struct ust_app *app; |
3252 | struct ust_app_session *ua_sess; | |
3253 | struct ust_app_channel *ua_chan; | |
3254 | struct ust_app_event *ua_event; | |
3255 | ||
3256 | DBG("UST app disabling event %s for all apps in channel " | |
a991f516 | 3257 | "%s for session id %d", uevent->attr.name, uchan->name, usess->id); |
b0a40d28 DG |
3258 | |
3259 | rcu_read_lock(); | |
3260 | ||
3261 | /* For all registered applications */ | |
852d0037 | 3262 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3263 | if (!app->compatible) { |
3264 | /* | |
3265 | * TODO: In time, we should notice the caller of this error by | |
3266 | * telling him that this is a version error. | |
3267 | */ | |
3268 | continue; | |
3269 | } | |
b0a40d28 DG |
3270 | ua_sess = lookup_session_by_app(usess, app); |
3271 | if (ua_sess == NULL) { | |
3272 | /* Next app */ | |
3273 | continue; | |
3274 | } | |
3275 | ||
3276 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3277 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3278 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 3279 | if (ua_chan_node == NULL) { |
a991f516 | 3280 | DBG2("Channel %s not found in session id %d for app pid %d." |
852d0037 | 3281 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
3282 | continue; |
3283 | } | |
3284 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3285 | ||
bec39940 DG |
3286 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter); |
3287 | ua_event_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 DG |
3288 | if (ua_event_node == NULL) { |
3289 | DBG2("Event %s not found in channel %s for app pid %d." | |
852d0037 | 3290 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
3291 | continue; |
3292 | } | |
3293 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
3294 | ||
7f79d3a1 | 3295 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
3296 | if (ret < 0) { |
3297 | /* XXX: Report error someday... */ | |
3298 | continue; | |
3299 | } | |
3300 | } | |
3301 | ||
3302 | rcu_read_unlock(); | |
3303 | ||
3304 | return ret; | |
3305 | } | |
3306 | ||
9730260e | 3307 | /* |
edb67388 | 3308 | * For a specific UST session and UST channel, the event for all |
9730260e DG |
3309 | * registered apps. |
3310 | */ | |
35a9059d | 3311 | int ust_app_disable_all_event_glb(struct ltt_ust_session *usess, |
9730260e DG |
3312 | struct ltt_ust_channel *uchan) |
3313 | { | |
3314 | int ret = 0; | |
bec39940 DG |
3315 | struct lttng_ht_iter iter, uiter; |
3316 | struct lttng_ht_node_str *ua_chan_node; | |
9730260e DG |
3317 | struct ust_app *app; |
3318 | struct ust_app_session *ua_sess; | |
3319 | struct ust_app_channel *ua_chan; | |
3320 | struct ust_app_event *ua_event; | |
3321 | ||
3322 | DBG("UST app disabling all event for all apps in channel " | |
a991f516 | 3323 | "%s for session id %d", uchan->name, usess->id); |
9730260e DG |
3324 | |
3325 | rcu_read_lock(); | |
3326 | ||
3327 | /* For all registered applications */ | |
852d0037 | 3328 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3329 | if (!app->compatible) { |
3330 | /* | |
3331 | * TODO: In time, we should notice the caller of this error by | |
3332 | * telling him that this is a version error. | |
3333 | */ | |
3334 | continue; | |
3335 | } | |
9730260e | 3336 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3337 | if (!ua_sess) { |
3338 | /* The application has problem or is probably dead. */ | |
3339 | continue; | |
3340 | } | |
9730260e DG |
3341 | |
3342 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3343 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3344 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3345 | /* If the channel is not found, there is a code flow error */ |
3346 | assert(ua_chan_node); | |
3347 | ||
9730260e DG |
3348 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3349 | ||
3350 | /* Disable each events of channel */ | |
bec39940 DG |
3351 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
3352 | node.node) { | |
7f79d3a1 | 3353 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
9730260e DG |
3354 | if (ret < 0) { |
3355 | /* XXX: Report error someday... */ | |
3356 | continue; | |
3357 | } | |
3358 | } | |
3359 | } | |
3360 | ||
3361 | rcu_read_unlock(); | |
3362 | ||
3363 | return ret; | |
3364 | } | |
3365 | ||
421cb601 | 3366 | /* |
5b4a0ec0 | 3367 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 3368 | */ |
35a9059d | 3369 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3370 | struct ltt_ust_channel *uchan) |
3371 | { | |
3d8ca23b | 3372 | int ret = 0, created; |
bec39940 | 3373 | struct lttng_ht_iter iter; |
48842b30 | 3374 | struct ust_app *app; |
3d8ca23b | 3375 | struct ust_app_session *ua_sess = NULL; |
48842b30 | 3376 | |
fc34caaa DG |
3377 | /* Very wrong code flow */ |
3378 | assert(usess); | |
3379 | assert(uchan); | |
421cb601 | 3380 | |
7972aab2 | 3381 | DBG2("UST app adding channel %s to UST domain for session id %d", |
a991f516 | 3382 | uchan->name, usess->id); |
48842b30 DG |
3383 | |
3384 | rcu_read_lock(); | |
421cb601 | 3385 | |
5b4a0ec0 | 3386 | /* For every registered applications */ |
852d0037 | 3387 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3388 | if (!app->compatible) { |
3389 | /* | |
3390 | * TODO: In time, we should notice the caller of this error by | |
3391 | * telling him that this is a version error. | |
3392 | */ | |
3393 | continue; | |
3394 | } | |
edb67388 DG |
3395 | /* |
3396 | * Create session on the tracer side and add it to app session HT. Note | |
3397 | * that if session exist, it will simply return a pointer to the ust | |
3398 | * app session. | |
3399 | */ | |
3d8ca23b DG |
3400 | ret = create_ust_app_session(usess, app, &ua_sess, &created); |
3401 | if (ret < 0) { | |
3402 | switch (ret) { | |
3403 | case -ENOTCONN: | |
3404 | /* | |
3405 | * The application's socket is not valid. Either a bad socket | |
3406 | * or a timeout on it. We can't inform the caller that for a | |
3407 | * specific app, the session failed so lets continue here. | |
3408 | */ | |
3409 | continue; | |
3410 | case -ENOMEM: | |
3411 | default: | |
3412 | goto error_rcu_unlock; | |
3413 | } | |
48842b30 | 3414 | } |
3d8ca23b | 3415 | assert(ua_sess); |
48842b30 | 3416 | |
d0b96690 | 3417 | pthread_mutex_lock(&ua_sess->lock); |
d65d2de8 DG |
3418 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, |
3419 | sizeof(uchan->name))) { | |
3420 | struct ustctl_consumer_channel_attr attr; | |
3421 | copy_channel_attr_to_ustctl(&attr, &uchan->attr); | |
3422 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, | |
3423 | &attr); | |
3424 | } else { | |
3425 | /* Create channel onto application. We don't need the chan ref. */ | |
3426 | ret = create_ust_app_channel(ua_sess, uchan, app, | |
3427 | LTTNG_UST_CHAN_PER_CPU, usess, NULL); | |
3428 | } | |
d0b96690 | 3429 | pthread_mutex_unlock(&ua_sess->lock); |
3d8ca23b DG |
3430 | if (ret < 0) { |
3431 | if (ret == -ENOMEM) { | |
3432 | /* No more memory is a fatal error. Stop right now. */ | |
3433 | goto error_rcu_unlock; | |
3434 | } | |
3435 | /* Cleanup the created session if it's the case. */ | |
3436 | if (created) { | |
d0b96690 | 3437 | destroy_app_session(app, ua_sess); |
3d8ca23b | 3438 | } |
48842b30 | 3439 | } |
48842b30 | 3440 | } |
5b4a0ec0 | 3441 | |
95e047ff | 3442 | error_rcu_unlock: |
48842b30 | 3443 | rcu_read_unlock(); |
3c14c33f | 3444 | return ret; |
48842b30 DG |
3445 | } |
3446 | ||
5b4a0ec0 | 3447 | /* |
edb67388 | 3448 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 3449 | */ |
35a9059d | 3450 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3451 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3452 | { | |
3453 | int ret = 0; | |
bec39940 | 3454 | struct lttng_ht_iter iter, uiter; |
18eace3b | 3455 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
3456 | struct ust_app *app; |
3457 | struct ust_app_session *ua_sess; | |
3458 | struct ust_app_channel *ua_chan; | |
3459 | struct ust_app_event *ua_event; | |
48842b30 | 3460 | |
a991f516 MD |
3461 | DBG("UST app enabling event %s for all apps for session id %d", |
3462 | uevent->attr.name, usess->id); | |
48842b30 | 3463 | |
edb67388 DG |
3464 | /* |
3465 | * NOTE: At this point, this function is called only if the session and | |
3466 | * channel passed are already created for all apps. and enabled on the | |
3467 | * tracer also. | |
3468 | */ | |
3469 | ||
48842b30 | 3470 | rcu_read_lock(); |
421cb601 DG |
3471 | |
3472 | /* For all registered applications */ | |
852d0037 | 3473 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3474 | if (!app->compatible) { |
3475 | /* | |
3476 | * TODO: In time, we should notice the caller of this error by | |
3477 | * telling him that this is a version error. | |
3478 | */ | |
3479 | continue; | |
3480 | } | |
edb67388 | 3481 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3482 | if (!ua_sess) { |
3483 | /* The application has problem or is probably dead. */ | |
3484 | continue; | |
3485 | } | |
ba767faf | 3486 | |
d0b96690 DG |
3487 | pthread_mutex_lock(&ua_sess->lock); |
3488 | ||
edb67388 | 3489 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3490 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3491 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3492 | /* If the channel is not found, there is a code flow error */ |
3493 | assert(ua_chan_node); | |
3494 | ||
3495 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3496 | ||
18eace3b DG |
3497 | /* Get event node */ |
3498 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
3499 | uevent->filter, uevent->attr.loglevel); | |
3500 | if (ua_event == NULL) { | |
7f79d3a1 | 3501 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 3502 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 3503 | goto next_app; |
35a9059d | 3504 | } |
35a9059d DG |
3505 | |
3506 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
3507 | if (ret < 0) { | |
d0b96690 | 3508 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 3509 | goto error; |
48842b30 | 3510 | } |
d0b96690 DG |
3511 | next_app: |
3512 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
3513 | } |
3514 | ||
7f79d3a1 | 3515 | error: |
edb67388 | 3516 | rcu_read_unlock(); |
edb67388 DG |
3517 | return ret; |
3518 | } | |
3519 | ||
3520 | /* | |
3521 | * For a specific existing UST session and UST channel, creates the event for | |
3522 | * all registered apps. | |
3523 | */ | |
35a9059d | 3524 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
3525 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3526 | { | |
3527 | int ret = 0; | |
bec39940 DG |
3528 | struct lttng_ht_iter iter, uiter; |
3529 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
3530 | struct ust_app *app; |
3531 | struct ust_app_session *ua_sess; | |
3532 | struct ust_app_channel *ua_chan; | |
3533 | ||
a991f516 MD |
3534 | DBG("UST app creating event %s for all apps for session id %d", |
3535 | uevent->attr.name, usess->id); | |
edb67388 | 3536 | |
edb67388 DG |
3537 | rcu_read_lock(); |
3538 | ||
3539 | /* For all registered applications */ | |
852d0037 | 3540 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3541 | if (!app->compatible) { |
3542 | /* | |
3543 | * TODO: In time, we should notice the caller of this error by | |
3544 | * telling him that this is a version error. | |
3545 | */ | |
3546 | continue; | |
3547 | } | |
edb67388 | 3548 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3549 | if (!ua_sess) { |
3550 | /* The application has problem or is probably dead. */ | |
3551 | continue; | |
3552 | } | |
48842b30 | 3553 | |
d0b96690 | 3554 | pthread_mutex_lock(&ua_sess->lock); |
48842b30 | 3555 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3556 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3557 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3558 | /* If the channel is not found, there is a code flow error */ |
3559 | assert(ua_chan_node); | |
3560 | ||
48842b30 DG |
3561 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3562 | ||
edb67388 | 3563 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 3564 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 3565 | if (ret < 0) { |
49c336c1 | 3566 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
3567 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
3568 | break; | |
3569 | } | |
3570 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 3571 | uevent->attr.name, app->pid); |
5b4a0ec0 | 3572 | continue; |
48842b30 | 3573 | } |
48842b30 | 3574 | } |
5b4a0ec0 | 3575 | |
48842b30 DG |
3576 | rcu_read_unlock(); |
3577 | ||
3578 | return ret; | |
3579 | } | |
3580 | ||
5b4a0ec0 DG |
3581 | /* |
3582 | * Start tracing for a specific UST session and app. | |
3583 | */ | |
b34cbebf | 3584 | static |
421cb601 | 3585 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
3586 | { |
3587 | int ret = 0; | |
48842b30 | 3588 | struct ust_app_session *ua_sess; |
48842b30 | 3589 | |
852d0037 | 3590 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 3591 | |
509cbaf8 MD |
3592 | rcu_read_lock(); |
3593 | ||
e0c7ec2b DG |
3594 | if (!app->compatible) { |
3595 | goto end; | |
3596 | } | |
3597 | ||
421cb601 DG |
3598 | ua_sess = lookup_session_by_app(usess, app); |
3599 | if (ua_sess == NULL) { | |
d42f20df DG |
3600 | /* The session is in teardown process. Ignore and continue. */ |
3601 | goto end; | |
421cb601 | 3602 | } |
48842b30 | 3603 | |
d0b96690 DG |
3604 | pthread_mutex_lock(&ua_sess->lock); |
3605 | ||
aea829b3 DG |
3606 | /* Upon restart, we skip the setup, already done */ |
3607 | if (ua_sess->started) { | |
8be98f9a | 3608 | goto skip_setup; |
aea829b3 | 3609 | } |
8be98f9a | 3610 | |
a4b92340 DG |
3611 | /* Create directories if consumer is LOCAL and has a path defined. */ |
3612 | if (usess->consumer->type == CONSUMER_DST_LOCAL && | |
3613 | strlen(usess->consumer->dst.trace_path) > 0) { | |
3614 | ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path, | |
7972aab2 | 3615 | S_IRWXU | S_IRWXG, ua_sess->euid, ua_sess->egid); |
a4b92340 DG |
3616 | if (ret < 0) { |
3617 | if (ret != -EEXIST) { | |
3618 | ERR("Trace directory creation error"); | |
d0b96690 | 3619 | goto error_unlock; |
421cb601 | 3620 | } |
173af62f | 3621 | } |
7753dea8 | 3622 | } |
aea829b3 | 3623 | |
d65d2de8 DG |
3624 | /* |
3625 | * Create the metadata for the application. This returns gracefully if a | |
3626 | * metadata was already set for the session. | |
3627 | */ | |
3628 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, NULL); | |
421cb601 | 3629 | if (ret < 0) { |
d0b96690 | 3630 | goto error_unlock; |
421cb601 | 3631 | } |
48842b30 | 3632 | |
840cb59c | 3633 | health_code_update(); |
86acf0da | 3634 | |
8be98f9a | 3635 | skip_setup: |
421cb601 | 3636 | /* This start the UST tracing */ |
852d0037 | 3637 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
421cb601 | 3638 | if (ret < 0) { |
ffe60014 DG |
3639 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3640 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
3641 | app->pid, ret); | |
3642 | } else { | |
3643 | DBG("UST app start session failed. Application is dead."); | |
3644 | } | |
d0b96690 | 3645 | goto error_unlock; |
421cb601 | 3646 | } |
5b4a0ec0 | 3647 | |
55c3953d DG |
3648 | /* Indicate that the session has been started once */ |
3649 | ua_sess->started = 1; | |
3650 | ||
d0b96690 DG |
3651 | pthread_mutex_unlock(&ua_sess->lock); |
3652 | ||
840cb59c | 3653 | health_code_update(); |
86acf0da | 3654 | |
421cb601 | 3655 | /* Quiescent wait after starting trace */ |
ffe60014 DG |
3656 | ret = ustctl_wait_quiescent(app->sock); |
3657 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3658 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3659 | app->pid, ret); | |
3660 | } | |
48842b30 | 3661 | |
e0c7ec2b DG |
3662 | end: |
3663 | rcu_read_unlock(); | |
840cb59c | 3664 | health_code_update(); |
421cb601 | 3665 | return 0; |
48842b30 | 3666 | |
d0b96690 DG |
3667 | error_unlock: |
3668 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 3669 | rcu_read_unlock(); |
840cb59c | 3670 | health_code_update(); |
421cb601 DG |
3671 | return -1; |
3672 | } | |
48842b30 | 3673 | |
8be98f9a MD |
3674 | /* |
3675 | * Stop tracing for a specific UST session and app. | |
3676 | */ | |
b34cbebf | 3677 | static |
8be98f9a MD |
3678 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
3679 | { | |
3680 | int ret = 0; | |
3681 | struct ust_app_session *ua_sess; | |
7972aab2 | 3682 | struct ust_registry_session *registry; |
8be98f9a | 3683 | |
852d0037 | 3684 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
3685 | |
3686 | rcu_read_lock(); | |
3687 | ||
e0c7ec2b | 3688 | if (!app->compatible) { |
d88aee68 | 3689 | goto end_no_session; |
e0c7ec2b DG |
3690 | } |
3691 | ||
8be98f9a MD |
3692 | ua_sess = lookup_session_by_app(usess, app); |
3693 | if (ua_sess == NULL) { | |
d88aee68 | 3694 | goto end_no_session; |
8be98f9a MD |
3695 | } |
3696 | ||
d88aee68 DG |
3697 | pthread_mutex_lock(&ua_sess->lock); |
3698 | ||
9bc07046 DG |
3699 | /* |
3700 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
3701 | * that was never started. It's possible since we can have a fail start |
3702 | * from either the application manager thread or the command thread. Simply | |
3703 | * indicate that this is a stop error. | |
9bc07046 | 3704 | */ |
f9dfc3d9 | 3705 | if (!ua_sess->started) { |
c45536e1 DG |
3706 | goto error_rcu_unlock; |
3707 | } | |
7db205b5 | 3708 | |
840cb59c | 3709 | health_code_update(); |
86acf0da | 3710 | |
9d6c7d3f | 3711 | /* This inhibits UST tracing */ |
852d0037 | 3712 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
9d6c7d3f | 3713 | if (ret < 0) { |
ffe60014 DG |
3714 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3715 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
3716 | app->pid, ret); | |
3717 | } else { | |
3718 | DBG("UST app stop session failed. Application is dead."); | |
3719 | } | |
9d6c7d3f DG |
3720 | goto error_rcu_unlock; |
3721 | } | |
3722 | ||
840cb59c | 3723 | health_code_update(); |
86acf0da | 3724 | |
9d6c7d3f | 3725 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
3726 | ret = ustctl_wait_quiescent(app->sock); |
3727 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3728 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3729 | app->pid, ret); | |
3730 | } | |
9d6c7d3f | 3731 | |
840cb59c | 3732 | health_code_update(); |
86acf0da | 3733 | |
b34cbebf MD |
3734 | registry = get_session_registry(ua_sess); |
3735 | assert(registry); | |
3736 | /* Push metadata for application before freeing the application. */ | |
3737 | (void) push_metadata(registry, ua_sess->consumer); | |
3738 | ||
3739 | pthread_mutex_unlock(&ua_sess->lock); | |
3740 | end_no_session: | |
3741 | rcu_read_unlock(); | |
3742 | health_code_update(); | |
3743 | return 0; | |
3744 | ||
3745 | error_rcu_unlock: | |
3746 | pthread_mutex_unlock(&ua_sess->lock); | |
3747 | rcu_read_unlock(); | |
3748 | health_code_update(); | |
3749 | return -1; | |
3750 | } | |
3751 | ||
3752 | /* | |
3753 | * Flush buffers for a specific UST session and app. | |
3754 | */ | |
3755 | static | |
3756 | int ust_app_flush_trace(struct ltt_ust_session *usess, struct ust_app *app) | |
3757 | { | |
3758 | int ret = 0; | |
3759 | struct lttng_ht_iter iter; | |
3760 | struct ust_app_session *ua_sess; | |
3761 | struct ust_app_channel *ua_chan; | |
3762 | ||
3763 | DBG("Flushing buffers for ust app pid %d", app->pid); | |
3764 | ||
3765 | rcu_read_lock(); | |
3766 | ||
3767 | if (!app->compatible) { | |
3768 | goto end_no_session; | |
3769 | } | |
3770 | ||
3771 | ua_sess = lookup_session_by_app(usess, app); | |
3772 | if (ua_sess == NULL) { | |
3773 | goto end_no_session; | |
3774 | } | |
3775 | ||
3776 | pthread_mutex_lock(&ua_sess->lock); | |
3777 | ||
3778 | health_code_update(); | |
3779 | ||
9d6c7d3f | 3780 | /* Flushing buffers */ |
bec39940 DG |
3781 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
3782 | node.node) { | |
840cb59c | 3783 | health_code_update(); |
ffe60014 | 3784 | assert(ua_chan->is_sent); |
852d0037 | 3785 | ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj); |
8be98f9a | 3786 | if (ret < 0) { |
ffe60014 DG |
3787 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3788 | ERR("UST app PID %d channel %s flush failed with ret %d", | |
3789 | app->pid, ua_chan->name, ret); | |
3790 | } else { | |
3791 | DBG3("UST app failed to flush %s. Application is dead.", | |
3792 | ua_chan->name); | |
3793 | /* No need to continue. */ | |
d88aee68 | 3794 | break; |
ffe60014 | 3795 | } |
6d3686da DG |
3796 | /* Continuing flushing all buffers */ |
3797 | continue; | |
8be98f9a MD |
3798 | } |
3799 | } | |
8be98f9a | 3800 | |
840cb59c | 3801 | health_code_update(); |
86acf0da | 3802 | |
d88aee68 DG |
3803 | pthread_mutex_unlock(&ua_sess->lock); |
3804 | end_no_session: | |
7db205b5 | 3805 | rcu_read_unlock(); |
840cb59c | 3806 | health_code_update(); |
8be98f9a | 3807 | return 0; |
8be98f9a MD |
3808 | } |
3809 | ||
84cd17c6 MD |
3810 | /* |
3811 | * Destroy a specific UST session in apps. | |
3812 | */ | |
3353de95 | 3813 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 3814 | { |
ffe60014 | 3815 | int ret; |
84cd17c6 | 3816 | struct ust_app_session *ua_sess; |
bec39940 DG |
3817 | struct lttng_ht_iter iter; |
3818 | struct lttng_ht_node_ulong *node; | |
84cd17c6 | 3819 | |
852d0037 | 3820 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
3821 | |
3822 | rcu_read_lock(); | |
3823 | ||
e0c7ec2b DG |
3824 | if (!app->compatible) { |
3825 | goto end; | |
3826 | } | |
3827 | ||
84cd17c6 | 3828 | __lookup_session_by_app(usess, app, &iter); |
bec39940 | 3829 | node = lttng_ht_iter_get_node_ulong(&iter); |
84cd17c6 | 3830 | if (node == NULL) { |
d42f20df DG |
3831 | /* Session is being or is deleted. */ |
3832 | goto end; | |
84cd17c6 MD |
3833 | } |
3834 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 3835 | |
840cb59c | 3836 | health_code_update(); |
d0b96690 | 3837 | destroy_app_session(app, ua_sess); |
84cd17c6 | 3838 | |
840cb59c | 3839 | health_code_update(); |
7db205b5 | 3840 | |
84cd17c6 | 3841 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
3842 | ret = ustctl_wait_quiescent(app->sock); |
3843 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3844 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3845 | app->pid, ret); | |
3846 | } | |
e0c7ec2b DG |
3847 | end: |
3848 | rcu_read_unlock(); | |
840cb59c | 3849 | health_code_update(); |
84cd17c6 | 3850 | return 0; |
84cd17c6 MD |
3851 | } |
3852 | ||
5b4a0ec0 DG |
3853 | /* |
3854 | * Start tracing for the UST session. | |
3855 | */ | |
421cb601 DG |
3856 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
3857 | { | |
3858 | int ret = 0; | |
bec39940 | 3859 | struct lttng_ht_iter iter; |
421cb601 | 3860 | struct ust_app *app; |
48842b30 | 3861 | |
421cb601 DG |
3862 | DBG("Starting all UST traces"); |
3863 | ||
3864 | rcu_read_lock(); | |
421cb601 | 3865 | |
852d0037 | 3866 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
421cb601 | 3867 | ret = ust_app_start_trace(usess, app); |
48842b30 | 3868 | if (ret < 0) { |
5b4a0ec0 DG |
3869 | /* Continue to next apps even on error */ |
3870 | continue; | |
48842b30 | 3871 | } |
48842b30 | 3872 | } |
5b4a0ec0 | 3873 | |
48842b30 DG |
3874 | rcu_read_unlock(); |
3875 | ||
3876 | return 0; | |
3877 | } | |
487cf67c | 3878 | |
8be98f9a MD |
3879 | /* |
3880 | * Start tracing for the UST session. | |
3881 | */ | |
3882 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
3883 | { | |
3884 | int ret = 0; | |
bec39940 | 3885 | struct lttng_ht_iter iter; |
8be98f9a MD |
3886 | struct ust_app *app; |
3887 | ||
3888 | DBG("Stopping all UST traces"); | |
3889 | ||
3890 | rcu_read_lock(); | |
3891 | ||
b34cbebf MD |
3892 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3893 | ret = ust_app_stop_trace(usess, app); | |
3894 | if (ret < 0) { | |
3895 | /* Continue to next apps even on error */ | |
3896 | continue; | |
3897 | } | |
3898 | } | |
3899 | ||
3900 | /* Flush buffers */ | |
3901 | switch (usess->buffer_type) { | |
3902 | case LTTNG_BUFFER_PER_UID: | |
3903 | { | |
7972aab2 | 3904 | struct buffer_reg_uid *reg; |
b34cbebf MD |
3905 | |
3906 | /* Flush all per UID buffers associated to that session. */ | |
7972aab2 DG |
3907 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
3908 | struct buffer_reg_channel *reg_chan; | |
3909 | struct consumer_socket *socket; | |
3910 | ||
3911 | /* Get consumer socket to use to push the metadata.*/ | |
3912 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
3913 | usess->consumer); | |
3914 | if (!socket) { | |
3915 | /* Ignore request if no consumer is found for the session. */ | |
3916 | continue; | |
3917 | } | |
3918 | ||
3919 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
3920 | reg_chan, node.node) { | |
3921 | /* | |
3922 | * The following call will print error values so the return | |
3923 | * code is of little importance because whatever happens, we | |
3924 | * have to try them all. | |
3925 | */ | |
3926 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
3927 | } | |
3928 | } | |
b34cbebf | 3929 | break; |
7972aab2 | 3930 | } |
b34cbebf MD |
3931 | case LTTNG_BUFFER_PER_PID: |
3932 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3933 | ret = ust_app_flush_trace(usess, app); | |
3934 | if (ret < 0) { | |
3935 | /* Continue to next apps even on error */ | |
3936 | continue; | |
3937 | } | |
8be98f9a | 3938 | } |
b34cbebf MD |
3939 | break; |
3940 | default: | |
3941 | assert(0); | |
3942 | break; | |
8be98f9a MD |
3943 | } |
3944 | ||
3945 | rcu_read_unlock(); | |
3946 | ||
3947 | return 0; | |
3948 | } | |
3949 | ||
84cd17c6 MD |
3950 | /* |
3951 | * Destroy app UST session. | |
3952 | */ | |
3953 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
3954 | { | |
3955 | int ret = 0; | |
bec39940 | 3956 | struct lttng_ht_iter iter; |
84cd17c6 MD |
3957 | struct ust_app *app; |
3958 | ||
3959 | DBG("Destroy all UST traces"); | |
3960 | ||
3961 | rcu_read_lock(); | |
3962 | ||
852d0037 | 3963 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 3964 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
3965 | if (ret < 0) { |
3966 | /* Continue to next apps even on error */ | |
3967 | continue; | |
3968 | } | |
3969 | } | |
3970 | ||
3971 | rcu_read_unlock(); | |
3972 | ||
3973 | return 0; | |
3974 | } | |
3975 | ||
5b4a0ec0 DG |
3976 | /* |
3977 | * Add channels/events from UST global domain to registered apps at sock. | |
3978 | */ | |
487cf67c DG |
3979 | void ust_app_global_update(struct ltt_ust_session *usess, int sock) |
3980 | { | |
55c54cce | 3981 | int ret = 0; |
727d5404 | 3982 | struct lttng_ht_iter iter, uiter, iter_ctx; |
487cf67c | 3983 | struct ust_app *app; |
3d8ca23b | 3984 | struct ust_app_session *ua_sess = NULL; |
487cf67c DG |
3985 | struct ust_app_channel *ua_chan; |
3986 | struct ust_app_event *ua_event; | |
727d5404 | 3987 | struct ust_app_ctx *ua_ctx; |
1f3580c7 | 3988 | |
95e047ff | 3989 | assert(usess); |
ffe60014 | 3990 | assert(sock >= 0); |
1f3580c7 | 3991 | |
a991f516 MD |
3992 | DBG2("UST app global update for app sock %d for session id %d", sock, |
3993 | usess->id); | |
487cf67c | 3994 | |
284d8f55 DG |
3995 | rcu_read_lock(); |
3996 | ||
487cf67c DG |
3997 | app = find_app_by_sock(sock); |
3998 | if (app == NULL) { | |
d88aee68 DG |
3999 | /* |
4000 | * Application can be unregistered before so this is possible hence | |
4001 | * simply stopping the update. | |
4002 | */ | |
4003 | DBG3("UST app update failed to find app sock %d", sock); | |
487cf67c DG |
4004 | goto error; |
4005 | } | |
4006 | ||
e0c7ec2b DG |
4007 | if (!app->compatible) { |
4008 | goto error; | |
4009 | } | |
4010 | ||
3d8ca23b DG |
4011 | ret = create_ust_app_session(usess, app, &ua_sess, NULL); |
4012 | if (ret < 0) { | |
4013 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
4014 | goto error; |
4015 | } | |
3d8ca23b | 4016 | assert(ua_sess); |
487cf67c | 4017 | |
d0b96690 DG |
4018 | pthread_mutex_lock(&ua_sess->lock); |
4019 | ||
284d8f55 | 4020 | /* |
d0b96690 | 4021 | * We can iterate safely here over all UST app session since the create ust |
284d8f55 DG |
4022 | * app session above made a shadow copy of the UST global domain from the |
4023 | * ltt ust session. | |
4024 | */ | |
bec39940 DG |
4025 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
4026 | node.node) { | |
d65d2de8 DG |
4027 | /* |
4028 | * For a metadata channel, handle it differently. | |
4029 | */ | |
4030 | if (!strncmp(ua_chan->name, DEFAULT_METADATA_NAME, | |
4031 | sizeof(ua_chan->name))) { | |
4032 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, | |
4033 | &ua_chan->attr); | |
c7a339aa DG |
4034 | if (ret < 0) { |
4035 | goto error_unlock; | |
4036 | } | |
d65d2de8 DG |
4037 | /* Remove it from the hash table and continue!. */ |
4038 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
4039 | assert(!ret); | |
4040 | delete_ust_app_channel(-1, ua_chan, app); | |
4041 | continue; | |
4042 | } else { | |
4043 | ret = do_create_channel(app, usess, ua_sess, ua_chan); | |
c7a339aa DG |
4044 | if (ret < 0) { |
4045 | /* | |
4046 | * Stop everything. On error, the application failed, no more | |
4047 | * file descriptor are available or ENOMEM so stopping here is | |
4048 | * the only thing we can do for now. | |
4049 | */ | |
4050 | goto error_unlock; | |
4051 | } | |
487cf67c DG |
4052 | } |
4053 | ||
727d5404 DG |
4054 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter_ctx.iter, ua_ctx, |
4055 | node.node) { | |
4056 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
4057 | if (ret < 0) { | |
d0b96690 | 4058 | goto error_unlock; |
727d5404 DG |
4059 | } |
4060 | } | |
4061 | ||
4062 | ||
284d8f55 | 4063 | /* For each events */ |
bec39940 DG |
4064 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
4065 | node.node) { | |
284d8f55 DG |
4066 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
4067 | if (ret < 0) { | |
d0b96690 | 4068 | goto error_unlock; |
487cf67c | 4069 | } |
36dc12cc | 4070 | } |
487cf67c DG |
4071 | } |
4072 | ||
d0b96690 DG |
4073 | pthread_mutex_unlock(&ua_sess->lock); |
4074 | ||
36dc12cc | 4075 | if (usess->start_trace) { |
421cb601 | 4076 | ret = ust_app_start_trace(usess, app); |
36dc12cc | 4077 | if (ret < 0) { |
36dc12cc DG |
4078 | goto error; |
4079 | } | |
4080 | ||
852d0037 | 4081 | DBG2("UST trace started for app pid %d", app->pid); |
36dc12cc DG |
4082 | } |
4083 | ||
ffe60014 DG |
4084 | /* Everything went well at this point. */ |
4085 | rcu_read_unlock(); | |
4086 | return; | |
4087 | ||
d0b96690 DG |
4088 | error_unlock: |
4089 | pthread_mutex_unlock(&ua_sess->lock); | |
487cf67c | 4090 | error: |
ffe60014 | 4091 | if (ua_sess) { |
d0b96690 | 4092 | destroy_app_session(app, ua_sess); |
ffe60014 | 4093 | } |
487cf67c DG |
4094 | rcu_read_unlock(); |
4095 | return; | |
4096 | } | |
55cc08a6 DG |
4097 | |
4098 | /* | |
4099 | * Add context to a specific channel for global UST domain. | |
4100 | */ | |
4101 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
4102 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
4103 | { | |
4104 | int ret = 0; | |
bec39940 DG |
4105 | struct lttng_ht_node_str *ua_chan_node; |
4106 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
4107 | struct ust_app_channel *ua_chan = NULL; |
4108 | struct ust_app_session *ua_sess; | |
4109 | struct ust_app *app; | |
4110 | ||
4111 | rcu_read_lock(); | |
4112 | ||
852d0037 | 4113 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4114 | if (!app->compatible) { |
4115 | /* | |
4116 | * TODO: In time, we should notice the caller of this error by | |
4117 | * telling him that this is a version error. | |
4118 | */ | |
4119 | continue; | |
4120 | } | |
55cc08a6 DG |
4121 | ua_sess = lookup_session_by_app(usess, app); |
4122 | if (ua_sess == NULL) { | |
4123 | continue; | |
4124 | } | |
4125 | ||
d0b96690 | 4126 | pthread_mutex_lock(&ua_sess->lock); |
55cc08a6 | 4127 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4128 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4129 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 4130 | if (ua_chan_node == NULL) { |
d0b96690 | 4131 | goto next_app; |
55cc08a6 DG |
4132 | } |
4133 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
4134 | node); | |
55cc08a6 DG |
4135 | ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app); |
4136 | if (ret < 0) { | |
d0b96690 | 4137 | goto next_app; |
55cc08a6 | 4138 | } |
d0b96690 DG |
4139 | next_app: |
4140 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
4141 | } |
4142 | ||
55cc08a6 DG |
4143 | rcu_read_unlock(); |
4144 | return ret; | |
4145 | } | |
4146 | ||
76d45b40 DG |
4147 | /* |
4148 | * Enable event for a channel from a UST session for a specific PID. | |
4149 | */ | |
4150 | int ust_app_enable_event_pid(struct ltt_ust_session *usess, | |
4151 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4152 | { | |
4153 | int ret = 0; | |
bec39940 | 4154 | struct lttng_ht_iter iter; |
18eace3b | 4155 | struct lttng_ht_node_str *ua_chan_node; |
76d45b40 DG |
4156 | struct ust_app *app; |
4157 | struct ust_app_session *ua_sess; | |
4158 | struct ust_app_channel *ua_chan; | |
4159 | struct ust_app_event *ua_event; | |
4160 | ||
4161 | DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid); | |
4162 | ||
4163 | rcu_read_lock(); | |
4164 | ||
4165 | app = ust_app_find_by_pid(pid); | |
4166 | if (app == NULL) { | |
4167 | ERR("UST app enable event per PID %d not found", pid); | |
4168 | ret = -1; | |
d0b96690 | 4169 | goto end; |
76d45b40 DG |
4170 | } |
4171 | ||
e0c7ec2b DG |
4172 | if (!app->compatible) { |
4173 | ret = 0; | |
d0b96690 | 4174 | goto end; |
e0c7ec2b DG |
4175 | } |
4176 | ||
76d45b40 | 4177 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4178 | if (!ua_sess) { |
4179 | /* The application has problem or is probably dead. */ | |
d0b96690 DG |
4180 | ret = 0; |
4181 | goto end; | |
c4a1715b | 4182 | } |
76d45b40 | 4183 | |
d0b96690 | 4184 | pthread_mutex_lock(&ua_sess->lock); |
76d45b40 | 4185 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4186 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4187 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
76d45b40 DG |
4188 | /* If the channel is not found, there is a code flow error */ |
4189 | assert(ua_chan_node); | |
4190 | ||
4191 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4192 | ||
18eace3b DG |
4193 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
4194 | uevent->filter, uevent->attr.loglevel); | |
4195 | if (ua_event == NULL) { | |
76d45b40 DG |
4196 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
4197 | if (ret < 0) { | |
d0b96690 | 4198 | goto end_unlock; |
76d45b40 DG |
4199 | } |
4200 | } else { | |
76d45b40 DG |
4201 | ret = enable_ust_app_event(ua_sess, ua_event, app); |
4202 | if (ret < 0) { | |
d0b96690 | 4203 | goto end_unlock; |
76d45b40 DG |
4204 | } |
4205 | } | |
4206 | ||
d0b96690 DG |
4207 | end_unlock: |
4208 | pthread_mutex_unlock(&ua_sess->lock); | |
4209 | end: | |
76d45b40 DG |
4210 | rcu_read_unlock(); |
4211 | return ret; | |
4212 | } | |
7f79d3a1 DG |
4213 | |
4214 | /* | |
4215 | * Disable event for a channel from a UST session for a specific PID. | |
4216 | */ | |
4217 | int ust_app_disable_event_pid(struct ltt_ust_session *usess, | |
4218 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4219 | { | |
4220 | int ret = 0; | |
bec39940 DG |
4221 | struct lttng_ht_iter iter; |
4222 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
7f79d3a1 DG |
4223 | struct ust_app *app; |
4224 | struct ust_app_session *ua_sess; | |
4225 | struct ust_app_channel *ua_chan; | |
4226 | struct ust_app_event *ua_event; | |
4227 | ||
4228 | DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid); | |
4229 | ||
4230 | rcu_read_lock(); | |
4231 | ||
4232 | app = ust_app_find_by_pid(pid); | |
4233 | if (app == NULL) { | |
4234 | ERR("UST app disable event per PID %d not found", pid); | |
4235 | ret = -1; | |
4236 | goto error; | |
4237 | } | |
4238 | ||
e0c7ec2b DG |
4239 | if (!app->compatible) { |
4240 | ret = 0; | |
4241 | goto error; | |
4242 | } | |
4243 | ||
7f79d3a1 | 4244 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4245 | if (!ua_sess) { |
4246 | /* The application has problem or is probably dead. */ | |
4247 | goto error; | |
4248 | } | |
7f79d3a1 DG |
4249 | |
4250 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
4251 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4252 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
7f79d3a1 DG |
4253 | if (ua_chan_node == NULL) { |
4254 | /* Channel does not exist, skip disabling */ | |
4255 | goto error; | |
4256 | } | |
4257 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4258 | ||
bec39940 DG |
4259 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter); |
4260 | ua_event_node = lttng_ht_iter_get_node_str(&iter); | |
7f79d3a1 DG |
4261 | if (ua_event_node == NULL) { |
4262 | /* Event does not exist, skip disabling */ | |
4263 | goto error; | |
4264 | } | |
4265 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
4266 | ||
4267 | ret = disable_ust_app_event(ua_sess, ua_event, app); | |
4268 | if (ret < 0) { | |
4269 | goto error; | |
4270 | } | |
4271 | ||
4272 | error: | |
4273 | rcu_read_unlock(); | |
4274 | return ret; | |
4275 | } | |
e0c7ec2b | 4276 | |
4466912f DG |
4277 | /* |
4278 | * Calibrate registered applications. | |
4279 | */ | |
4280 | int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate) | |
4281 | { | |
4282 | int ret = 0; | |
4283 | struct lttng_ht_iter iter; | |
4284 | struct ust_app *app; | |
4285 | ||
4286 | rcu_read_lock(); | |
4287 | ||
852d0037 | 4288 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4466912f DG |
4289 | if (!app->compatible) { |
4290 | /* | |
4291 | * TODO: In time, we should notice the caller of this error by | |
4292 | * telling him that this is a version error. | |
4293 | */ | |
4294 | continue; | |
4295 | } | |
4296 | ||
840cb59c | 4297 | health_code_update(); |
86acf0da | 4298 | |
852d0037 | 4299 | ret = ustctl_calibrate(app->sock, calibrate); |
4466912f DG |
4300 | if (ret < 0) { |
4301 | switch (ret) { | |
4302 | case -ENOSYS: | |
4303 | /* Means that it's not implemented on the tracer side. */ | |
4304 | ret = 0; | |
4305 | break; | |
4306 | default: | |
4466912f | 4307 | DBG2("Calibrate app PID %d returned with error %d", |
852d0037 | 4308 | app->pid, ret); |
4466912f DG |
4309 | break; |
4310 | } | |
4311 | } | |
4312 | } | |
4313 | ||
4314 | DBG("UST app global domain calibration finished"); | |
4315 | ||
4316 | rcu_read_unlock(); | |
4317 | ||
840cb59c | 4318 | health_code_update(); |
86acf0da | 4319 | |
4466912f DG |
4320 | return ret; |
4321 | } | |
d0b96690 DG |
4322 | |
4323 | /* | |
4324 | * Receive registration and populate the given msg structure. | |
4325 | * | |
4326 | * On success return 0 else a negative value returned by the ustctl call. | |
4327 | */ | |
4328 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
4329 | { | |
4330 | int ret; | |
4331 | uint32_t pid, ppid, uid, gid; | |
4332 | ||
4333 | assert(msg); | |
4334 | ||
4335 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
4336 | &pid, &ppid, &uid, &gid, | |
4337 | &msg->bits_per_long, | |
4338 | &msg->uint8_t_alignment, | |
4339 | &msg->uint16_t_alignment, | |
4340 | &msg->uint32_t_alignment, | |
4341 | &msg->uint64_t_alignment, | |
4342 | &msg->long_alignment, | |
4343 | &msg->byte_order, | |
4344 | msg->name); | |
4345 | if (ret < 0) { | |
4346 | switch (-ret) { | |
4347 | case EPIPE: | |
4348 | case ECONNRESET: | |
4349 | case LTTNG_UST_ERR_EXITING: | |
4350 | DBG3("UST app recv reg message failed. Application died"); | |
4351 | break; | |
4352 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
4353 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
4354 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
4355 | LTTNG_UST_ABI_MINOR_VERSION); | |
4356 | break; | |
4357 | default: | |
4358 | ERR("UST app recv reg message failed with ret %d", ret); | |
4359 | break; | |
4360 | } | |
4361 | goto error; | |
4362 | } | |
4363 | msg->pid = (pid_t) pid; | |
4364 | msg->ppid = (pid_t) ppid; | |
4365 | msg->uid = (uid_t) uid; | |
4366 | msg->gid = (gid_t) gid; | |
4367 | ||
4368 | error: | |
4369 | return ret; | |
4370 | } | |
4371 | ||
d88aee68 DG |
4372 | /* |
4373 | * Return a ust app channel object using the application object and the channel | |
4374 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
4375 | * lock MUST be acquired before calling this function. | |
4376 | */ | |
d0b96690 DG |
4377 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
4378 | int objd) | |
4379 | { | |
4380 | struct lttng_ht_node_ulong *node; | |
4381 | struct lttng_ht_iter iter; | |
4382 | struct ust_app_channel *ua_chan = NULL; | |
4383 | ||
4384 | assert(app); | |
4385 | ||
4386 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
4387 | node = lttng_ht_iter_get_node_ulong(&iter); | |
4388 | if (node == NULL) { | |
4389 | DBG2("UST app channel find by objd %d not found", objd); | |
4390 | goto error; | |
4391 | } | |
4392 | ||
4393 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
4394 | ||
4395 | error: | |
4396 | return ua_chan; | |
4397 | } | |
4398 | ||
d88aee68 DG |
4399 | /* |
4400 | * Reply to a register channel notification from an application on the notify | |
4401 | * socket. The channel metadata is also created. | |
4402 | * | |
4403 | * The session UST registry lock is acquired in this function. | |
4404 | * | |
4405 | * On success 0 is returned else a negative value. | |
4406 | */ | |
d0b96690 DG |
4407 | static int reply_ust_register_channel(int sock, int sobjd, int cobjd, |
4408 | size_t nr_fields, struct ustctl_field *fields) | |
4409 | { | |
4410 | int ret, ret_code = 0; | |
4411 | uint32_t chan_id, reg_count; | |
7972aab2 | 4412 | uint64_t chan_reg_key; |
d0b96690 DG |
4413 | enum ustctl_channel_header type; |
4414 | struct ust_app *app; | |
4415 | struct ust_app_channel *ua_chan; | |
4416 | struct ust_app_session *ua_sess; | |
7972aab2 | 4417 | struct ust_registry_session *registry; |
45893984 | 4418 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
4419 | |
4420 | rcu_read_lock(); | |
4421 | ||
4422 | /* Lookup application. If not found, there is a code flow error. */ | |
4423 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4424 | if (!app) { |
4425 | DBG("Application socket %d is being teardown. Abort event notify", | |
4426 | sock); | |
4427 | ret = 0; | |
4428 | goto error_rcu_unlock; | |
4429 | } | |
d0b96690 DG |
4430 | |
4431 | /* Lookup channel by UST object descriptor. Should always be found. */ | |
4432 | ua_chan = find_channel_by_objd(app, cobjd); | |
4433 | assert(ua_chan); | |
4434 | assert(ua_chan->session); | |
4435 | ua_sess = ua_chan->session; | |
d0b96690 | 4436 | |
7972aab2 DG |
4437 | /* Get right session registry depending on the session buffer type. */ |
4438 | registry = get_session_registry(ua_sess); | |
4439 | assert(registry); | |
45893984 | 4440 | |
7972aab2 DG |
4441 | /* Depending on the buffer type, a different channel key is used. */ |
4442 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4443 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 4444 | } else { |
7972aab2 | 4445 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
4446 | } |
4447 | ||
7972aab2 DG |
4448 | pthread_mutex_lock(®istry->lock); |
4449 | ||
4450 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
4451 | assert(chan_reg); | |
4452 | ||
4453 | if (!chan_reg->register_done) { | |
4454 | reg_count = ust_registry_get_event_count(chan_reg); | |
4455 | if (reg_count < 31) { | |
4456 | type = USTCTL_CHANNEL_HEADER_COMPACT; | |
4457 | } else { | |
4458 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
4459 | } | |
4460 | ||
4461 | chan_reg->nr_ctx_fields = nr_fields; | |
4462 | chan_reg->ctx_fields = fields; | |
4463 | chan_reg->header_type = type; | |
d0b96690 | 4464 | } else { |
7972aab2 DG |
4465 | /* Get current already assigned values. */ |
4466 | type = chan_reg->header_type; | |
d0b96690 | 4467 | } |
7972aab2 DG |
4468 | /* Channel id is set during the object creation. */ |
4469 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
4470 | |
4471 | /* Append to metadata */ | |
7972aab2 DG |
4472 | if (!chan_reg->metadata_dumped) { |
4473 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
4474 | if (ret_code) { |
4475 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
4476 | goto reply; | |
4477 | } | |
4478 | } | |
4479 | ||
4480 | reply: | |
7972aab2 DG |
4481 | DBG3("UST app replying to register channel key %" PRIu64 |
4482 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
4483 | ret_code); | |
d0b96690 DG |
4484 | |
4485 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
4486 | if (ret < 0) { | |
4487 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4488 | ERR("UST app reply channel failed with ret %d", ret); | |
4489 | } else { | |
4490 | DBG3("UST app reply channel failed. Application died"); | |
4491 | } | |
4492 | goto error; | |
4493 | } | |
4494 | ||
7972aab2 DG |
4495 | /* This channel registry registration is completed. */ |
4496 | chan_reg->register_done = 1; | |
4497 | ||
d0b96690 | 4498 | error: |
7972aab2 | 4499 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4500 | error_rcu_unlock: |
d0b96690 DG |
4501 | rcu_read_unlock(); |
4502 | return ret; | |
4503 | } | |
4504 | ||
d88aee68 DG |
4505 | /* |
4506 | * Add event to the UST channel registry. When the event is added to the | |
4507 | * registry, the metadata is also created. Once done, this replies to the | |
4508 | * application with the appropriate error code. | |
4509 | * | |
4510 | * The session UST registry lock is acquired in the function. | |
4511 | * | |
4512 | * On success 0 is returned else a negative value. | |
4513 | */ | |
d0b96690 DG |
4514 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
4515 | char *sig, size_t nr_fields, struct ustctl_field *fields, int loglevel, | |
4516 | char *model_emf_uri) | |
4517 | { | |
4518 | int ret, ret_code; | |
4519 | uint32_t event_id = 0; | |
7972aab2 | 4520 | uint64_t chan_reg_key; |
d0b96690 DG |
4521 | struct ust_app *app; |
4522 | struct ust_app_channel *ua_chan; | |
4523 | struct ust_app_session *ua_sess; | |
7972aab2 | 4524 | struct ust_registry_session *registry; |
d0b96690 DG |
4525 | |
4526 | rcu_read_lock(); | |
4527 | ||
4528 | /* Lookup application. If not found, there is a code flow error. */ | |
4529 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4530 | if (!app) { |
4531 | DBG("Application socket %d is being teardown. Abort event notify", | |
4532 | sock); | |
4533 | ret = 0; | |
4534 | goto error_rcu_unlock; | |
4535 | } | |
d0b96690 DG |
4536 | |
4537 | /* Lookup channel by UST object descriptor. Should always be found. */ | |
4538 | ua_chan = find_channel_by_objd(app, cobjd); | |
4539 | assert(ua_chan); | |
4540 | assert(ua_chan->session); | |
4541 | ua_sess = ua_chan->session; | |
4542 | ||
7972aab2 DG |
4543 | registry = get_session_registry(ua_sess); |
4544 | assert(registry); | |
4545 | ||
4546 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4547 | chan_reg_key = ua_chan->tracing_channel_id; | |
4548 | } else { | |
4549 | chan_reg_key = ua_chan->key; | |
4550 | } | |
4551 | ||
4552 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 4553 | |
7972aab2 | 4554 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
45893984 | 4555 | sobjd, cobjd, name, sig, nr_fields, fields, loglevel, |
7972aab2 | 4556 | model_emf_uri, ua_sess->buffer_type, &event_id); |
d0b96690 DG |
4557 | |
4558 | /* | |
4559 | * The return value is returned to ustctl so in case of an error, the | |
4560 | * application can be notified. In case of an error, it's important not to | |
4561 | * return a negative error or else the application will get closed. | |
4562 | */ | |
4563 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
4564 | if (ret < 0) { | |
4565 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4566 | ERR("UST app reply event failed with ret %d", ret); | |
4567 | } else { | |
4568 | DBG3("UST app reply event failed. Application died"); | |
4569 | } | |
4570 | /* | |
4571 | * No need to wipe the create event since the application socket will | |
4572 | * get close on error hence cleaning up everything by itself. | |
4573 | */ | |
4574 | goto error; | |
4575 | } | |
4576 | ||
7972aab2 DG |
4577 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
4578 | name, event_id); | |
d88aee68 | 4579 | |
d0b96690 | 4580 | error: |
7972aab2 | 4581 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4582 | error_rcu_unlock: |
d0b96690 DG |
4583 | rcu_read_unlock(); |
4584 | return ret; | |
4585 | } | |
4586 | ||
d88aee68 DG |
4587 | /* |
4588 | * Handle application notification through the given notify socket. | |
4589 | * | |
4590 | * Return 0 on success or else a negative value. | |
4591 | */ | |
d0b96690 DG |
4592 | int ust_app_recv_notify(int sock) |
4593 | { | |
4594 | int ret; | |
4595 | enum ustctl_notify_cmd cmd; | |
4596 | ||
4597 | DBG3("UST app receiving notify from sock %d", sock); | |
4598 | ||
4599 | ret = ustctl_recv_notify(sock, &cmd); | |
4600 | if (ret < 0) { | |
4601 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4602 | ERR("UST app recv notify failed with ret %d", ret); | |
4603 | } else { | |
4604 | DBG3("UST app recv notify failed. Application died"); | |
4605 | } | |
4606 | goto error; | |
4607 | } | |
4608 | ||
4609 | switch (cmd) { | |
4610 | case USTCTL_NOTIFY_CMD_EVENT: | |
4611 | { | |
4612 | int sobjd, cobjd, loglevel; | |
4613 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; | |
4614 | size_t nr_fields; | |
4615 | struct ustctl_field *fields; | |
4616 | ||
4617 | DBG2("UST app ustctl register event received"); | |
4618 | ||
4619 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, &loglevel, | |
4620 | &sig, &nr_fields, &fields, &model_emf_uri); | |
4621 | if (ret < 0) { | |
4622 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4623 | ERR("UST app recv event failed with ret %d", ret); | |
4624 | } else { | |
4625 | DBG3("UST app recv event failed. Application died"); | |
4626 | } | |
4627 | goto error; | |
4628 | } | |
4629 | ||
4630 | /* Add event to the UST registry coming from the notify socket. */ | |
4631 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, | |
4632 | fields, loglevel, model_emf_uri); | |
4633 | if (ret < 0) { | |
4634 | goto error; | |
4635 | } | |
4636 | ||
4637 | break; | |
4638 | } | |
4639 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
4640 | { | |
4641 | int sobjd, cobjd; | |
4642 | size_t nr_fields; | |
4643 | struct ustctl_field *fields; | |
4644 | ||
4645 | DBG2("UST app ustctl register channel received"); | |
4646 | ||
4647 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
4648 | &fields); | |
4649 | if (ret < 0) { | |
4650 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4651 | ERR("UST app recv channel failed with ret %d", ret); | |
4652 | } else { | |
4653 | DBG3("UST app recv channel failed. Application died"); | |
4654 | } | |
4655 | goto error; | |
4656 | } | |
4657 | ||
4658 | ret = reply_ust_register_channel(sock, sobjd, cobjd, nr_fields, | |
4659 | fields); | |
4660 | if (ret < 0) { | |
4661 | goto error; | |
4662 | } | |
4663 | ||
4664 | break; | |
4665 | } | |
4666 | default: | |
4667 | /* Should NEVER happen. */ | |
4668 | assert(0); | |
4669 | } | |
4670 | ||
4671 | error: | |
4672 | return ret; | |
4673 | } | |
d88aee68 DG |
4674 | |
4675 | /* | |
4676 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
4677 | * corresponding application. On failure, the call_rcu to close the socket is | |
4678 | * executed. If an application is found, it tries to delete it from the notify | |
4679 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
4680 | * | |
4681 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
4682 | * call RCU is not done but the rest of the cleanup is. | |
4683 | */ | |
4684 | void ust_app_notify_sock_unregister(int sock) | |
4685 | { | |
4686 | int err_enomem = 0; | |
4687 | struct lttng_ht_iter iter; | |
4688 | struct ust_app *app; | |
4689 | struct ust_app_notify_sock_obj *obj; | |
4690 | ||
4691 | assert(sock >= 0); | |
4692 | ||
4693 | rcu_read_lock(); | |
4694 | ||
4695 | obj = zmalloc(sizeof(*obj)); | |
4696 | if (!obj) { | |
4697 | /* | |
4698 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
4699 | * procedure but the call_rcu will not be called. In this case, we | |
4700 | * accept the fd leak rather than possibly creating an unsynchronized | |
4701 | * state between threads. | |
4702 | * | |
4703 | * TODO: The notify object should be created once the notify socket is | |
4704 | * registered and stored independantely from the ust app object. The | |
4705 | * tricky part is to synchronize the teardown of the application and | |
4706 | * this notify object. Let's keep that in mind so we can avoid this | |
4707 | * kind of shenanigans with ENOMEM in the teardown path. | |
4708 | */ | |
4709 | err_enomem = 1; | |
4710 | } else { | |
4711 | obj->fd = sock; | |
4712 | } | |
4713 | ||
4714 | DBG("UST app notify socket unregister %d", sock); | |
4715 | ||
4716 | /* | |
4717 | * Lookup application by notify socket. If this fails, this means that the | |
4718 | * hash table delete has already been done by the application | |
4719 | * unregistration process so we can safely close the notify socket in a | |
4720 | * call RCU. | |
4721 | */ | |
4722 | app = find_app_by_notify_sock(sock); | |
4723 | if (!app) { | |
4724 | goto close_socket; | |
4725 | } | |
4726 | ||
4727 | iter.iter.node = &app->notify_sock_n.node; | |
4728 | ||
4729 | /* | |
4730 | * Whatever happens here either we fail or succeed, in both cases we have | |
4731 | * to close the socket after a grace period to continue to the call RCU | |
4732 | * here. If the deletion is successful, the application is not visible | |
4733 | * anymore by other threads and is it fails it means that it was already | |
4734 | * deleted from the hash table so either way we just have to close the | |
4735 | * socket. | |
4736 | */ | |
4737 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
4738 | ||
4739 | close_socket: | |
4740 | rcu_read_unlock(); | |
4741 | ||
4742 | /* | |
4743 | * Close socket after a grace period to avoid for the socket to be reused | |
4744 | * before the application object is freed creating potential race between | |
4745 | * threads trying to add unique in the global hash table. | |
4746 | */ | |
4747 | if (!err_enomem) { | |
4748 | call_rcu(&obj->head, close_notify_sock_rcu); | |
4749 | } | |
4750 | } |