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 | 36 | #include "fd-limit.h" |
8782cc74 | 37 | #include "health-sessiond.h" |
56fff090 | 38 | #include "ust-app.h" |
48842b30 | 39 | #include "ust-consumer.h" |
d80a6244 | 40 | #include "ust-ctl.h" |
0b2dc8df | 41 | #include "utils.h" |
d80a6244 | 42 | |
99090057 MD |
43 | static |
44 | int ust_app_flush_app_session(struct ust_app *app, struct ust_app_session *ua_sess); | |
45 | ||
d9bf3ca4 MD |
46 | /* Next available channel key. Access under next_channel_key_lock. */ |
47 | static uint64_t _next_channel_key; | |
48 | static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER; | |
49 | ||
50 | /* Next available session ID. Access under next_session_id_lock. */ | |
51 | static uint64_t _next_session_id; | |
52 | static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER; | |
ffe60014 DG |
53 | |
54 | /* | |
d9bf3ca4 | 55 | * Return the incremented value of next_channel_key. |
ffe60014 | 56 | */ |
d9bf3ca4 | 57 | static uint64_t get_next_channel_key(void) |
ffe60014 | 58 | { |
d9bf3ca4 MD |
59 | uint64_t ret; |
60 | ||
61 | pthread_mutex_lock(&next_channel_key_lock); | |
62 | ret = ++_next_channel_key; | |
63 | pthread_mutex_unlock(&next_channel_key_lock); | |
64 | return ret; | |
ffe60014 DG |
65 | } |
66 | ||
67 | /* | |
7972aab2 | 68 | * Return the atomically incremented value of next_session_id. |
ffe60014 | 69 | */ |
d9bf3ca4 | 70 | static uint64_t get_next_session_id(void) |
ffe60014 | 71 | { |
d9bf3ca4 MD |
72 | uint64_t ret; |
73 | ||
74 | pthread_mutex_lock(&next_session_id_lock); | |
75 | ret = ++_next_session_id; | |
76 | pthread_mutex_unlock(&next_session_id_lock); | |
77 | return ret; | |
ffe60014 DG |
78 | } |
79 | ||
d65d2de8 DG |
80 | static void copy_channel_attr_to_ustctl( |
81 | struct ustctl_consumer_channel_attr *attr, | |
82 | struct lttng_ust_channel_attr *uattr) | |
83 | { | |
84 | /* Copy event attributes since the layout is different. */ | |
85 | attr->subbuf_size = uattr->subbuf_size; | |
86 | attr->num_subbuf = uattr->num_subbuf; | |
87 | attr->overwrite = uattr->overwrite; | |
88 | attr->switch_timer_interval = uattr->switch_timer_interval; | |
89 | attr->read_timer_interval = uattr->read_timer_interval; | |
90 | attr->output = uattr->output; | |
91 | } | |
92 | ||
025faf73 DG |
93 | /* |
94 | * Match function for the hash table lookup. | |
95 | * | |
96 | * It matches an ust app event based on three attributes which are the event | |
97 | * name, the filter bytecode and the loglevel. | |
98 | */ | |
18eace3b DG |
99 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
100 | { | |
101 | struct ust_app_event *event; | |
102 | const struct ust_app_ht_key *key; | |
103 | ||
104 | assert(node); | |
105 | assert(_key); | |
106 | ||
107 | event = caa_container_of(node, struct ust_app_event, node.node); | |
108 | key = _key; | |
109 | ||
1af53eb5 | 110 | /* Match the 4 elements of the key: name, filter, loglevel, exclusions */ |
18eace3b DG |
111 | |
112 | /* Event name */ | |
113 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
114 | goto no_match; | |
115 | } | |
116 | ||
117 | /* Event loglevel. */ | |
118 | if (event->attr.loglevel != key->loglevel) { | |
025faf73 DG |
119 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
120 | && key->loglevel == 0 && event->attr.loglevel == -1) { | |
121 | /* | |
122 | * Match is accepted. This is because on event creation, the | |
123 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
124 | * -1 are accepted for this loglevel type since 0 is the one set by | |
125 | * the API when receiving an enable event. | |
126 | */ | |
127 | } else { | |
128 | goto no_match; | |
129 | } | |
18eace3b DG |
130 | } |
131 | ||
132 | /* One of the filters is NULL, fail. */ | |
133 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
134 | goto no_match; | |
135 | } | |
136 | ||
025faf73 DG |
137 | if (key->filter && event->filter) { |
138 | /* Both filters exists, check length followed by the bytecode. */ | |
139 | if (event->filter->len != key->filter->len || | |
140 | memcmp(event->filter->data, key->filter->data, | |
141 | event->filter->len) != 0) { | |
142 | goto no_match; | |
143 | } | |
18eace3b DG |
144 | } |
145 | ||
1af53eb5 JI |
146 | /* One of the exclusions is NULL, fail. */ |
147 | if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) { | |
148 | goto no_match; | |
149 | } | |
150 | ||
151 | if (key->exclusion && event->exclusion) { | |
152 | /* Both exclusions exists, check count followed by the names. */ | |
153 | if (event->exclusion->count != key->exclusion->count || | |
154 | memcmp(event->exclusion->names, key->exclusion->names, | |
155 | event->exclusion->count * LTTNG_UST_SYM_NAME_LEN) != 0) { | |
156 | goto no_match; | |
157 | } | |
158 | } | |
159 | ||
160 | ||
025faf73 | 161 | /* Match. */ |
18eace3b DG |
162 | return 1; |
163 | ||
164 | no_match: | |
165 | return 0; | |
18eace3b DG |
166 | } |
167 | ||
025faf73 DG |
168 | /* |
169 | * Unique add of an ust app event in the given ht. This uses the custom | |
170 | * ht_match_ust_app_event match function and the event name as hash. | |
171 | */ | |
d0b96690 | 172 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
173 | struct ust_app_event *event) |
174 | { | |
175 | struct cds_lfht_node *node_ptr; | |
176 | struct ust_app_ht_key key; | |
d0b96690 | 177 | struct lttng_ht *ht; |
18eace3b | 178 | |
d0b96690 DG |
179 | assert(ua_chan); |
180 | assert(ua_chan->events); | |
18eace3b DG |
181 | assert(event); |
182 | ||
d0b96690 | 183 | ht = ua_chan->events; |
18eace3b DG |
184 | key.name = event->attr.name; |
185 | key.filter = event->filter; | |
186 | key.loglevel = event->attr.loglevel; | |
91c89f23 | 187 | key.exclusion = event->exclusion; |
18eace3b DG |
188 | |
189 | node_ptr = cds_lfht_add_unique(ht->ht, | |
190 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
191 | ht_match_ust_app_event, &key, &event->node.node); | |
192 | assert(node_ptr == &event->node.node); | |
193 | } | |
194 | ||
d88aee68 DG |
195 | /* |
196 | * Close the notify socket from the given RCU head object. This MUST be called | |
197 | * through a call_rcu(). | |
198 | */ | |
199 | static void close_notify_sock_rcu(struct rcu_head *head) | |
200 | { | |
201 | int ret; | |
202 | struct ust_app_notify_sock_obj *obj = | |
203 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
204 | ||
205 | /* Must have a valid fd here. */ | |
206 | assert(obj->fd >= 0); | |
207 | ||
208 | ret = close(obj->fd); | |
209 | if (ret) { | |
210 | ERR("close notify sock %d RCU", obj->fd); | |
211 | } | |
212 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
213 | ||
214 | free(obj); | |
215 | } | |
216 | ||
7972aab2 DG |
217 | /* |
218 | * Return the session registry according to the buffer type of the given | |
219 | * session. | |
220 | * | |
221 | * A registry per UID object MUST exists before calling this function or else | |
222 | * it assert() if not found. RCU read side lock must be acquired. | |
223 | */ | |
224 | static struct ust_registry_session *get_session_registry( | |
225 | struct ust_app_session *ua_sess) | |
226 | { | |
227 | struct ust_registry_session *registry = NULL; | |
228 | ||
229 | assert(ua_sess); | |
230 | ||
231 | switch (ua_sess->buffer_type) { | |
232 | case LTTNG_BUFFER_PER_PID: | |
233 | { | |
234 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
235 | if (!reg_pid) { | |
236 | goto error; | |
237 | } | |
238 | registry = reg_pid->registry->reg.ust; | |
239 | break; | |
240 | } | |
241 | case LTTNG_BUFFER_PER_UID: | |
242 | { | |
243 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
244 | ua_sess->tracing_id, ua_sess->bits_per_long, ua_sess->uid); | |
245 | if (!reg_uid) { | |
246 | goto error; | |
247 | } | |
248 | registry = reg_uid->registry->reg.ust; | |
249 | break; | |
250 | } | |
251 | default: | |
252 | assert(0); | |
253 | }; | |
254 | ||
255 | error: | |
256 | return registry; | |
257 | } | |
258 | ||
55cc08a6 DG |
259 | /* |
260 | * Delete ust context safely. RCU read lock must be held before calling | |
261 | * this function. | |
262 | */ | |
263 | static | |
264 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx) | |
265 | { | |
ffe60014 DG |
266 | int ret; |
267 | ||
268 | assert(ua_ctx); | |
269 | ||
55cc08a6 | 270 | if (ua_ctx->obj) { |
ffe60014 | 271 | ret = ustctl_release_object(sock, ua_ctx->obj); |
d0b96690 DG |
272 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
273 | ERR("UST app sock %d release ctx obj handle %d failed with ret %d", | |
274 | sock, ua_ctx->obj->handle, ret); | |
ffe60014 | 275 | } |
55cc08a6 DG |
276 | free(ua_ctx->obj); |
277 | } | |
278 | free(ua_ctx); | |
279 | } | |
280 | ||
d80a6244 DG |
281 | /* |
282 | * Delete ust app event safely. RCU read lock must be held before calling | |
283 | * this function. | |
284 | */ | |
8b366481 DG |
285 | static |
286 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event) | |
d80a6244 | 287 | { |
ffe60014 DG |
288 | int ret; |
289 | ||
290 | assert(ua_event); | |
291 | ||
53a80697 | 292 | free(ua_event->filter); |
951f0b71 JI |
293 | if (ua_event->exclusion != NULL) |
294 | free(ua_event->exclusion); | |
edb67388 | 295 | if (ua_event->obj != NULL) { |
ffe60014 DG |
296 | ret = ustctl_release_object(sock, ua_event->obj); |
297 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
298 | ERR("UST app sock %d release event obj failed with ret %d", | |
299 | sock, ret); | |
300 | } | |
edb67388 DG |
301 | free(ua_event->obj); |
302 | } | |
d80a6244 DG |
303 | free(ua_event); |
304 | } | |
305 | ||
306 | /* | |
7972aab2 DG |
307 | * Release ust data object of the given stream. |
308 | * | |
309 | * Return 0 on success or else a negative value. | |
d80a6244 | 310 | */ |
7972aab2 | 311 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream) |
d80a6244 | 312 | { |
7972aab2 | 313 | int ret = 0; |
ffe60014 DG |
314 | |
315 | assert(stream); | |
316 | ||
8b366481 | 317 | if (stream->obj) { |
ffe60014 DG |
318 | ret = ustctl_release_object(sock, stream->obj); |
319 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
320 | ERR("UST app sock %d release stream obj failed with ret %d", | |
321 | sock, ret); | |
322 | } | |
4063050c | 323 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
324 | free(stream->obj); |
325 | } | |
7972aab2 DG |
326 | |
327 | return ret; | |
328 | } | |
329 | ||
330 | /* | |
331 | * Delete ust app stream safely. RCU read lock must be held before calling | |
332 | * this function. | |
333 | */ | |
334 | static | |
335 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream) | |
336 | { | |
337 | assert(stream); | |
338 | ||
339 | (void) release_ust_app_stream(sock, stream); | |
84cd17c6 | 340 | free(stream); |
d80a6244 DG |
341 | } |
342 | ||
36b588ed MD |
343 | /* |
344 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
345 | * section and outside of call_rcu thread, so we postpone its execution |
346 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
347 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
348 | */ |
349 | static | |
350 | void delete_ust_app_channel_rcu(struct rcu_head *head) | |
351 | { | |
352 | struct ust_app_channel *ua_chan = | |
353 | caa_container_of(head, struct ust_app_channel, rcu_head); | |
354 | ||
0b2dc8df MD |
355 | ht_cleanup_push(ua_chan->ctx); |
356 | ht_cleanup_push(ua_chan->events); | |
36b588ed MD |
357 | free(ua_chan); |
358 | } | |
359 | ||
d80a6244 DG |
360 | /* |
361 | * Delete ust app channel safely. RCU read lock must be held before calling | |
362 | * this function. | |
363 | */ | |
8b366481 | 364 | static |
d0b96690 DG |
365 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
366 | struct ust_app *app) | |
d80a6244 DG |
367 | { |
368 | int ret; | |
bec39940 | 369 | struct lttng_ht_iter iter; |
d80a6244 | 370 | struct ust_app_event *ua_event; |
55cc08a6 | 371 | struct ust_app_ctx *ua_ctx; |
030a66fa | 372 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 373 | struct ust_registry_session *registry; |
d80a6244 | 374 | |
ffe60014 DG |
375 | assert(ua_chan); |
376 | ||
377 | DBG3("UST app deleting channel %s", ua_chan->name); | |
378 | ||
55cc08a6 | 379 | /* Wipe stream */ |
d80a6244 | 380 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 381 | cds_list_del(&stream->list); |
d80a6244 DG |
382 | delete_ust_app_stream(sock, stream); |
383 | } | |
384 | ||
55cc08a6 | 385 | /* Wipe context */ |
bec39940 | 386 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
31746f93 | 387 | cds_list_del(&ua_ctx->list); |
bec39940 | 388 | ret = lttng_ht_del(ua_chan->ctx, &iter); |
55cc08a6 DG |
389 | assert(!ret); |
390 | delete_ust_app_ctx(sock, ua_ctx); | |
391 | } | |
d80a6244 | 392 | |
55cc08a6 | 393 | /* Wipe events */ |
bec39940 DG |
394 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
395 | node.node) { | |
396 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 397 | assert(!ret); |
d80a6244 DG |
398 | delete_ust_app_event(sock, ua_event); |
399 | } | |
edb67388 | 400 | |
c8335706 MD |
401 | if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) { |
402 | /* Wipe and free registry from session registry. */ | |
403 | registry = get_session_registry(ua_chan->session); | |
404 | if (registry) { | |
405 | ust_registry_channel_del_free(registry, ua_chan->key); | |
406 | } | |
7972aab2 | 407 | } |
d0b96690 | 408 | |
edb67388 | 409 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
410 | /* Remove channel from application UST object descriptor. */ |
411 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
c6e62271 DG |
412 | ret = lttng_ht_del(app->ust_objd, &iter); |
413 | assert(!ret); | |
ffe60014 DG |
414 | ret = ustctl_release_object(sock, ua_chan->obj); |
415 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
416 | ERR("UST app sock %d release channel obj failed with ret %d", | |
417 | sock, ret); | |
418 | } | |
7972aab2 | 419 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
420 | free(ua_chan->obj); |
421 | } | |
36b588ed | 422 | call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); |
d80a6244 DG |
423 | } |
424 | ||
331744e3 | 425 | /* |
1b532a60 DG |
426 | * Push metadata to consumer socket. |
427 | * | |
b2040829 MD |
428 | * RCU read-side lock must be held to guarantee existance of socket. |
429 | * Must be called with the ust app session lock held. | |
430 | * Must be called with the registry lock held. | |
331744e3 JD |
431 | * |
432 | * On success, return the len of metadata pushed or else a negative value. | |
d81a925f MD |
433 | * Returning a -EPIPE return value means we could not send the metadata, |
434 | * but it can be caused by recoverable errors (e.g. the application has | |
435 | * terminated concurrently). | |
331744e3 JD |
436 | */ |
437 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
438 | struct consumer_socket *socket, int send_zero_data) | |
439 | { | |
440 | int ret; | |
441 | char *metadata_str = NULL; | |
442 | size_t len, offset; | |
443 | ssize_t ret_val; | |
444 | ||
445 | assert(registry); | |
446 | assert(socket); | |
1b532a60 | 447 | |
e3ae3c71 | 448 | /* |
b2040829 MD |
449 | * Means that no metadata was assigned to the session. This can |
450 | * happens if no start has been done previously. | |
e3ae3c71 MD |
451 | */ |
452 | if (!registry->metadata_key) { | |
e3ae3c71 MD |
453 | return 0; |
454 | } | |
455 | ||
1b532a60 | 456 | /* |
b2040829 MD |
457 | * On a push metadata error either the consumer is dead or the |
458 | * metadata channel has been destroyed because its endpoint | |
d81a925f MD |
459 | * might have died (e.g: relayd), or because the application has |
460 | * exited. If so, the metadata closed flag is set to 1 so we | |
461 | * deny pushing metadata again which is not valid anymore on the | |
462 | * consumer side. | |
1b532a60 DG |
463 | */ |
464 | if (registry->metadata_closed) { | |
465 | return -EPIPE; | |
466 | } | |
331744e3 | 467 | |
331744e3 JD |
468 | offset = registry->metadata_len_sent; |
469 | len = registry->metadata_len - registry->metadata_len_sent; | |
470 | if (len == 0) { | |
471 | DBG3("No metadata to push for metadata key %" PRIu64, | |
472 | registry->metadata_key); | |
473 | ret_val = len; | |
474 | if (send_zero_data) { | |
475 | DBG("No metadata to push"); | |
476 | goto push_data; | |
477 | } | |
478 | goto end; | |
479 | } | |
480 | ||
481 | /* Allocate only what we have to send. */ | |
482 | metadata_str = zmalloc(len); | |
483 | if (!metadata_str) { | |
484 | PERROR("zmalloc ust app metadata string"); | |
485 | ret_val = -ENOMEM; | |
486 | goto error; | |
487 | } | |
488 | /* Copy what we haven't send out. */ | |
489 | memcpy(metadata_str, registry->metadata + offset, len); | |
490 | registry->metadata_len_sent += len; | |
491 | ||
492 | push_data: | |
331744e3 JD |
493 | ret = consumer_push_metadata(socket, registry->metadata_key, |
494 | metadata_str, len, offset); | |
495 | if (ret < 0) { | |
000baf6a | 496 | /* |
b2040829 MD |
497 | * There is an acceptable race here between the registry |
498 | * metadata key assignment and the creation on the | |
499 | * consumer. The session daemon can concurrently push | |
500 | * metadata for this registry while being created on the | |
501 | * consumer since the metadata key of the registry is | |
502 | * assigned *before* it is setup to avoid the consumer | |
503 | * to ask for metadata that could possibly be not found | |
504 | * in the session daemon. | |
000baf6a | 505 | * |
b2040829 MD |
506 | * The metadata will get pushed either by the session |
507 | * being stopped or the consumer requesting metadata if | |
508 | * that race is triggered. | |
000baf6a DG |
509 | */ |
510 | if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) { | |
511 | ret = 0; | |
512 | } | |
ffa3f245 | 513 | |
b2040829 MD |
514 | /* |
515 | * Update back the actual metadata len sent since it | |
516 | * failed here. | |
517 | */ | |
ffa3f245 | 518 | registry->metadata_len_sent -= len; |
331744e3 JD |
519 | ret_val = ret; |
520 | goto error_push; | |
521 | } | |
522 | ||
523 | free(metadata_str); | |
524 | return len; | |
525 | ||
526 | end: | |
527 | error: | |
e3ae3c71 MD |
528 | if (ret_val) { |
529 | /* | |
b2040829 MD |
530 | * On error, flag the registry that the metadata is |
531 | * closed. We were unable to push anything and this | |
532 | * means that either the consumer is not responding or | |
533 | * the metadata cache has been destroyed on the | |
534 | * consumer. | |
e3ae3c71 MD |
535 | */ |
536 | registry->metadata_closed = 1; | |
537 | } | |
331744e3 JD |
538 | error_push: |
539 | free(metadata_str); | |
540 | return ret_val; | |
541 | } | |
542 | ||
d88aee68 | 543 | /* |
e3ae3c71 | 544 | * For a given application and session, push metadata to consumer. |
331744e3 JD |
545 | * Either sock or consumer is required : if sock is NULL, the default |
546 | * socket to send the metadata is retrieved from consumer, if sock | |
547 | * is not NULL we use it to send the metadata. | |
e3ae3c71 | 548 | * RCU read-side lock must be held while calling this function, |
b2040829 MD |
549 | * therefore ensuring existance of registry. It also ensures existance |
550 | * of socket throughout this function. | |
d88aee68 DG |
551 | * |
552 | * Return 0 on success else a negative error. | |
d81a925f MD |
553 | * Returning a -EPIPE return value means we could not send the metadata, |
554 | * but it can be caused by recoverable errors (e.g. the application has | |
555 | * terminated concurrently). | |
d88aee68 | 556 | */ |
7972aab2 DG |
557 | static int push_metadata(struct ust_registry_session *registry, |
558 | struct consumer_output *consumer) | |
d88aee68 | 559 | { |
331744e3 JD |
560 | int ret_val; |
561 | ssize_t ret; | |
d88aee68 DG |
562 | struct consumer_socket *socket; |
563 | ||
7972aab2 DG |
564 | assert(registry); |
565 | assert(consumer); | |
566 | ||
e3ae3c71 | 567 | pthread_mutex_lock(®istry->lock); |
e3ae3c71 | 568 | if (registry->metadata_closed) { |
b2040829 MD |
569 | ret_val = -EPIPE; |
570 | goto error; | |
d88aee68 DG |
571 | } |
572 | ||
d88aee68 | 573 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
574 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
575 | consumer); | |
d88aee68 | 576 | if (!socket) { |
331744e3 | 577 | ret_val = -1; |
e3ae3c71 | 578 | goto error; |
d88aee68 DG |
579 | } |
580 | ||
331744e3 | 581 | ret = ust_app_push_metadata(registry, socket, 0); |
d88aee68 | 582 | if (ret < 0) { |
331744e3 | 583 | ret_val = ret; |
e3ae3c71 | 584 | goto error; |
d88aee68 | 585 | } |
b2040829 | 586 | pthread_mutex_unlock(®istry->lock); |
d88aee68 DG |
587 | return 0; |
588 | ||
e3ae3c71 | 589 | error: |
b2040829 | 590 | pthread_mutex_unlock(®istry->lock); |
331744e3 | 591 | return ret_val; |
d88aee68 DG |
592 | } |
593 | ||
594 | /* | |
595 | * Send to the consumer a close metadata command for the given session. Once | |
596 | * done, the metadata channel is deleted and the session metadata pointer is | |
b2040829 | 597 | * nullified. The session lock MUST be held unless the application is |
d88aee68 DG |
598 | * in the destroy path. |
599 | * | |
600 | * Return 0 on success else a negative value. | |
601 | */ | |
7972aab2 DG |
602 | static int close_metadata(struct ust_registry_session *registry, |
603 | struct consumer_output *consumer) | |
d88aee68 DG |
604 | { |
605 | int ret; | |
606 | struct consumer_socket *socket; | |
607 | ||
7972aab2 DG |
608 | assert(registry); |
609 | assert(consumer); | |
d88aee68 | 610 | |
7972aab2 DG |
611 | rcu_read_lock(); |
612 | ||
e3ae3c71 MD |
613 | pthread_mutex_lock(®istry->lock); |
614 | ||
7972aab2 | 615 | if (!registry->metadata_key || registry->metadata_closed) { |
d88aee68 | 616 | ret = 0; |
1b532a60 | 617 | goto end; |
d88aee68 DG |
618 | } |
619 | ||
d88aee68 | 620 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
621 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
622 | consumer); | |
d88aee68 DG |
623 | if (!socket) { |
624 | ret = -1; | |
7972aab2 | 625 | goto error; |
d88aee68 DG |
626 | } |
627 | ||
7972aab2 | 628 | ret = consumer_close_metadata(socket, registry->metadata_key); |
d88aee68 | 629 | if (ret < 0) { |
7972aab2 | 630 | goto error; |
d88aee68 DG |
631 | } |
632 | ||
d88aee68 | 633 | error: |
1b532a60 DG |
634 | /* |
635 | * Metadata closed. Even on error this means that the consumer is not | |
636 | * responding or not found so either way a second close should NOT be emit | |
637 | * for this registry. | |
638 | */ | |
639 | registry->metadata_closed = 1; | |
640 | end: | |
e3ae3c71 | 641 | pthread_mutex_unlock(®istry->lock); |
7972aab2 | 642 | rcu_read_unlock(); |
d88aee68 DG |
643 | return ret; |
644 | } | |
645 | ||
36b588ed MD |
646 | /* |
647 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
648 | * section and outside of call_rcu thread, so we postpone its execution |
649 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
650 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
651 | */ |
652 | static | |
653 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
654 | { | |
655 | struct ust_app_session *ua_sess = | |
656 | caa_container_of(head, struct ust_app_session, rcu_head); | |
657 | ||
0b2dc8df | 658 | ht_cleanup_push(ua_sess->channels); |
36b588ed MD |
659 | free(ua_sess); |
660 | } | |
661 | ||
d80a6244 DG |
662 | /* |
663 | * Delete ust app session safely. RCU read lock must be held before calling | |
664 | * this function. | |
665 | */ | |
8b366481 | 666 | static |
d0b96690 DG |
667 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
668 | struct ust_app *app) | |
d80a6244 DG |
669 | { |
670 | int ret; | |
bec39940 | 671 | struct lttng_ht_iter iter; |
d80a6244 | 672 | struct ust_app_channel *ua_chan; |
7972aab2 | 673 | struct ust_registry_session *registry; |
d80a6244 | 674 | |
d88aee68 DG |
675 | assert(ua_sess); |
676 | ||
1b532a60 DG |
677 | pthread_mutex_lock(&ua_sess->lock); |
678 | ||
d4769e14 MD |
679 | assert(!ua_sess->deleted); |
680 | ua_sess->deleted = true; | |
681 | ||
7972aab2 | 682 | registry = get_session_registry(ua_sess); |
e3ae3c71 | 683 | if (registry) { |
d88aee68 | 684 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 685 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 686 | |
7972aab2 DG |
687 | /* |
688 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
689 | * metadata only on destroy trace session in this case. Also, the |
690 | * previous push metadata could have flag the metadata registry to | |
691 | * close so don't send a close command if closed. | |
7972aab2 | 692 | */ |
e3ae3c71 | 693 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
694 | /* And ask to close it for this session registry. */ |
695 | (void) close_metadata(registry, ua_sess->consumer); | |
696 | } | |
d80a6244 DG |
697 | } |
698 | ||
bec39940 DG |
699 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
700 | node.node) { | |
701 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 702 | assert(!ret); |
d0b96690 | 703 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 704 | } |
d80a6244 | 705 | |
7972aab2 DG |
706 | /* In case of per PID, the registry is kept in the session. */ |
707 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
708 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
709 | if (reg_pid) { | |
710 | buffer_reg_pid_remove(reg_pid); | |
711 | buffer_reg_pid_destroy(reg_pid); | |
712 | } | |
713 | } | |
d0b96690 | 714 | |
aee6bafd | 715 | if (ua_sess->handle != -1) { |
ffe60014 DG |
716 | ret = ustctl_release_handle(sock, ua_sess->handle); |
717 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
718 | ERR("UST app sock %d release session handle failed with ret %d", | |
719 | sock, ret); | |
720 | } | |
aee6bafd | 721 | } |
1b532a60 DG |
722 | pthread_mutex_unlock(&ua_sess->lock); |
723 | ||
36b588ed | 724 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 725 | } |
91d76f53 DG |
726 | |
727 | /* | |
284d8f55 DG |
728 | * Delete a traceable application structure from the global list. Never call |
729 | * this function outside of a call_rcu call. | |
36b588ed MD |
730 | * |
731 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 732 | */ |
8b366481 DG |
733 | static |
734 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 735 | { |
8b366481 | 736 | int ret, sock; |
d42f20df | 737 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 738 | |
d80a6244 | 739 | /* Delete ust app sessions info */ |
852d0037 DG |
740 | sock = app->sock; |
741 | app->sock = -1; | |
d80a6244 | 742 | |
8b366481 | 743 | /* Wipe sessions */ |
d42f20df DG |
744 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
745 | teardown_node) { | |
746 | /* Free every object in the session and the session. */ | |
36b588ed | 747 | rcu_read_lock(); |
d0b96690 | 748 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 749 | rcu_read_unlock(); |
d80a6244 | 750 | } |
36b588ed | 751 | |
0b2dc8df MD |
752 | ht_cleanup_push(app->sessions); |
753 | ht_cleanup_push(app->ust_objd); | |
d80a6244 | 754 | |
6414a713 | 755 | /* |
852d0037 DG |
756 | * Wait until we have deleted the application from the sock hash table |
757 | * before closing this socket, otherwise an application could re-use the | |
758 | * socket ID and race with the teardown, using the same hash table entry. | |
759 | * | |
760 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
761 | * all RCU readers that could run concurrently with unregister app, | |
762 | * therefore we _need_ to only close that socket after a grace period. So | |
763 | * it should stay in this RCU callback. | |
764 | * | |
765 | * This close() is a very important step of the synchronization model so | |
766 | * every modification to this function must be carefully reviewed. | |
6414a713 | 767 | */ |
799e2c4f MD |
768 | ret = close(sock); |
769 | if (ret) { | |
770 | PERROR("close"); | |
771 | } | |
4063050c | 772 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 773 | |
852d0037 | 774 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 775 | free(app); |
099e26bd DG |
776 | } |
777 | ||
778 | /* | |
f6a9efaa | 779 | * URCU intermediate call to delete an UST app. |
099e26bd | 780 | */ |
8b366481 DG |
781 | static |
782 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 783 | { |
bec39940 DG |
784 | struct lttng_ht_node_ulong *node = |
785 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 786 | struct ust_app *app = |
852d0037 | 787 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 788 | |
852d0037 | 789 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 790 | delete_ust_app(app); |
099e26bd DG |
791 | } |
792 | ||
ffe60014 DG |
793 | /* |
794 | * Delete the session from the application ht and delete the data structure by | |
795 | * freeing every object inside and releasing them. | |
796 | */ | |
d0b96690 | 797 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
798 | struct ust_app_session *ua_sess) |
799 | { | |
800 | int ret; | |
801 | struct lttng_ht_iter iter; | |
802 | ||
803 | assert(app); | |
804 | assert(ua_sess); | |
805 | ||
806 | iter.iter.node = &ua_sess->node.node; | |
807 | ret = lttng_ht_del(app->sessions, &iter); | |
808 | if (ret) { | |
809 | /* Already scheduled for teardown. */ | |
810 | goto end; | |
811 | } | |
812 | ||
813 | /* Once deleted, free the data structure. */ | |
d0b96690 | 814 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
815 | |
816 | end: | |
817 | return; | |
818 | } | |
819 | ||
8b366481 DG |
820 | /* |
821 | * Alloc new UST app session. | |
822 | */ | |
823 | static | |
d0b96690 | 824 | struct ust_app_session *alloc_ust_app_session(struct ust_app *app) |
8b366481 DG |
825 | { |
826 | struct ust_app_session *ua_sess; | |
827 | ||
828 | /* Init most of the default value by allocating and zeroing */ | |
829 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
830 | if (ua_sess == NULL) { | |
831 | PERROR("malloc"); | |
ffe60014 | 832 | goto error_free; |
8b366481 DG |
833 | } |
834 | ||
835 | ua_sess->handle = -1; | |
bec39940 | 836 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
ad7a9107 | 837 | ua_sess->metadata_attr.type = LTTNG_UST_CHAN_METADATA; |
84ad93e8 | 838 | pthread_mutex_init(&ua_sess->lock, NULL); |
ad7a9107 | 839 | |
8b366481 DG |
840 | return ua_sess; |
841 | ||
ffe60014 | 842 | error_free: |
8b366481 DG |
843 | return NULL; |
844 | } | |
845 | ||
846 | /* | |
847 | * Alloc new UST app channel. | |
848 | */ | |
849 | static | |
850 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 851 | struct ust_app_session *ua_sess, |
ffe60014 | 852 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
853 | { |
854 | struct ust_app_channel *ua_chan; | |
855 | ||
856 | /* Init most of the default value by allocating and zeroing */ | |
857 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
858 | if (ua_chan == NULL) { | |
859 | PERROR("malloc"); | |
860 | goto error; | |
861 | } | |
862 | ||
863 | /* Setup channel name */ | |
864 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
865 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
866 | ||
867 | ua_chan->enabled = 1; | |
868 | ua_chan->handle = -1; | |
45893984 | 869 | ua_chan->session = ua_sess; |
ffe60014 | 870 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
871 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
872 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
873 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
874 | |
875 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
31746f93 | 876 | CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); |
8b366481 DG |
877 | |
878 | /* Copy attributes */ | |
879 | if (attr) { | |
ffe60014 | 880 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
881 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
882 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
883 | ua_chan->attr.overwrite = attr->overwrite; | |
884 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
885 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
886 | ua_chan->attr.output = attr->output; | |
8b366481 | 887 | } |
ffe60014 DG |
888 | /* By default, the channel is a per cpu channel. */ |
889 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
890 | |
891 | DBG3("UST app channel %s allocated", ua_chan->name); | |
892 | ||
893 | return ua_chan; | |
894 | ||
895 | error: | |
896 | return NULL; | |
897 | } | |
898 | ||
37f1c236 DG |
899 | /* |
900 | * Allocate and initialize a UST app stream. | |
901 | * | |
902 | * Return newly allocated stream pointer or NULL on error. | |
903 | */ | |
ffe60014 | 904 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
905 | { |
906 | struct ust_app_stream *stream = NULL; | |
907 | ||
908 | stream = zmalloc(sizeof(*stream)); | |
909 | if (stream == NULL) { | |
910 | PERROR("zmalloc ust app stream"); | |
911 | goto error; | |
912 | } | |
913 | ||
914 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
915 | stream->handle = -1; | |
916 | ||
917 | error: | |
918 | return stream; | |
919 | } | |
920 | ||
8b366481 DG |
921 | /* |
922 | * Alloc new UST app event. | |
923 | */ | |
924 | static | |
925 | struct ust_app_event *alloc_ust_app_event(char *name, | |
926 | struct lttng_ust_event *attr) | |
927 | { | |
928 | struct ust_app_event *ua_event; | |
929 | ||
930 | /* Init most of the default value by allocating and zeroing */ | |
931 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
932 | if (ua_event == NULL) { | |
933 | PERROR("malloc"); | |
934 | goto error; | |
935 | } | |
936 | ||
937 | ua_event->enabled = 1; | |
938 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
939 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 940 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
941 | |
942 | /* Copy attributes */ | |
943 | if (attr) { | |
944 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
945 | } | |
946 | ||
947 | DBG3("UST app event %s allocated", ua_event->name); | |
948 | ||
949 | return ua_event; | |
950 | ||
951 | error: | |
952 | return NULL; | |
953 | } | |
954 | ||
955 | /* | |
956 | * Alloc new UST app context. | |
957 | */ | |
958 | static | |
959 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx) | |
960 | { | |
961 | struct ust_app_ctx *ua_ctx; | |
962 | ||
963 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
964 | if (ua_ctx == NULL) { | |
965 | goto error; | |
966 | } | |
967 | ||
31746f93 DG |
968 | CDS_INIT_LIST_HEAD(&ua_ctx->list); |
969 | ||
8b366481 DG |
970 | if (uctx) { |
971 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
972 | } | |
973 | ||
974 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
975 | ||
976 | error: | |
977 | return ua_ctx; | |
978 | } | |
979 | ||
025faf73 DG |
980 | /* |
981 | * Allocate a filter and copy the given original filter. | |
982 | * | |
983 | * Return allocated filter or NULL on error. | |
984 | */ | |
985 | static struct lttng_ust_filter_bytecode *alloc_copy_ust_app_filter( | |
986 | struct lttng_ust_filter_bytecode *orig_f) | |
987 | { | |
988 | struct lttng_ust_filter_bytecode *filter = NULL; | |
989 | ||
990 | /* Copy filter bytecode */ | |
991 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
992 | if (!filter) { | |
993 | PERROR("zmalloc alloc ust app filter"); | |
994 | goto error; | |
995 | } | |
996 | ||
997 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
998 | ||
999 | error: | |
1000 | return filter; | |
1001 | } | |
1002 | ||
099e26bd | 1003 | /* |
421cb601 DG |
1004 | * Find an ust_app using the sock and return it. RCU read side lock must be |
1005 | * held before calling this helper function. | |
099e26bd | 1006 | */ |
f20baf8e | 1007 | struct ust_app *ust_app_find_by_sock(int sock) |
099e26bd | 1008 | { |
bec39940 | 1009 | struct lttng_ht_node_ulong *node; |
bec39940 | 1010 | struct lttng_ht_iter iter; |
f6a9efaa | 1011 | |
852d0037 | 1012 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 1013 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
1014 | if (node == NULL) { |
1015 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
1016 | goto error; |
1017 | } | |
852d0037 DG |
1018 | |
1019 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
1020 | |
1021 | error: | |
1022 | return NULL; | |
099e26bd DG |
1023 | } |
1024 | ||
d0b96690 DG |
1025 | /* |
1026 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
1027 | * be held before calling this helper function. | |
1028 | */ | |
1029 | static struct ust_app *find_app_by_notify_sock(int sock) | |
1030 | { | |
1031 | struct lttng_ht_node_ulong *node; | |
1032 | struct lttng_ht_iter iter; | |
1033 | ||
1034 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
1035 | &iter); | |
1036 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1037 | if (node == NULL) { | |
1038 | DBG2("UST app find by notify sock %d not found", sock); | |
1039 | goto error; | |
1040 | } | |
1041 | ||
1042 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
1043 | ||
1044 | error: | |
1045 | return NULL; | |
1046 | } | |
1047 | ||
025faf73 DG |
1048 | /* |
1049 | * Lookup for an ust app event based on event name, filter bytecode and the | |
1050 | * event loglevel. | |
1051 | * | |
1052 | * Return an ust_app_event object or NULL on error. | |
1053 | */ | |
18eace3b | 1054 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
39c5a3a7 JI |
1055 | char *name, struct lttng_ust_filter_bytecode *filter, int loglevel, |
1056 | const struct lttng_event_exclusion *exclusion) | |
18eace3b DG |
1057 | { |
1058 | struct lttng_ht_iter iter; | |
1059 | struct lttng_ht_node_str *node; | |
1060 | struct ust_app_event *event = NULL; | |
1061 | struct ust_app_ht_key key; | |
18eace3b DG |
1062 | |
1063 | assert(name); | |
1064 | assert(ht); | |
1065 | ||
1066 | /* Setup key for event lookup. */ | |
1067 | key.name = name; | |
1068 | key.filter = filter; | |
1069 | key.loglevel = loglevel; | |
39c5a3a7 JI |
1070 | /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */ |
1071 | key.exclusion = (struct lttng_ust_event_exclusion *)exclusion; | |
18eace3b | 1072 | |
025faf73 DG |
1073 | /* Lookup using the event name as hash and a custom match fct. */ |
1074 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1075 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1076 | node = lttng_ht_iter_get_node_str(&iter); |
1077 | if (node == NULL) { | |
1078 | goto end; | |
1079 | } | |
1080 | ||
1081 | event = caa_container_of(node, struct ust_app_event, node); | |
1082 | ||
1083 | end: | |
18eace3b DG |
1084 | return event; |
1085 | } | |
1086 | ||
55cc08a6 DG |
1087 | /* |
1088 | * Create the channel context on the tracer. | |
d0b96690 DG |
1089 | * |
1090 | * Called with UST app session lock held. | |
55cc08a6 DG |
1091 | */ |
1092 | static | |
1093 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1094 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1095 | { | |
1096 | int ret; | |
1097 | ||
840cb59c | 1098 | health_code_update(); |
86acf0da | 1099 | |
852d0037 | 1100 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 DG |
1101 | ua_chan->obj, &ua_ctx->obj); |
1102 | if (ret < 0) { | |
ffe60014 DG |
1103 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1104 | ERR("UST app create channel context failed for app (pid: %d) " | |
1105 | "with ret %d", app->pid, ret); | |
1106 | } else { | |
3757b385 DG |
1107 | /* |
1108 | * This is normal behavior, an application can die during the | |
1109 | * creation process. Don't report an error so the execution can | |
1110 | * continue normally. | |
1111 | */ | |
1112 | ret = 0; | |
ffe60014 DG |
1113 | DBG3("UST app disable event failed. Application is dead."); |
1114 | } | |
55cc08a6 DG |
1115 | goto error; |
1116 | } | |
1117 | ||
1118 | ua_ctx->handle = ua_ctx->obj->handle; | |
1119 | ||
d0b96690 DG |
1120 | DBG2("UST app context handle %d created successfully for channel %s", |
1121 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1122 | |
1123 | error: | |
840cb59c | 1124 | health_code_update(); |
55cc08a6 DG |
1125 | return ret; |
1126 | } | |
1127 | ||
53a80697 MD |
1128 | /* |
1129 | * Set the filter on the tracer. | |
1130 | */ | |
1131 | static | |
1132 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
1133 | struct ust_app *app) | |
1134 | { | |
1135 | int ret; | |
1136 | ||
840cb59c | 1137 | health_code_update(); |
86acf0da | 1138 | |
53a80697 | 1139 | if (!ua_event->filter) { |
86acf0da DG |
1140 | ret = 0; |
1141 | goto error; | |
53a80697 MD |
1142 | } |
1143 | ||
1144 | ret = ustctl_set_filter(app->sock, ua_event->filter, | |
1145 | ua_event->obj); | |
1146 | if (ret < 0) { | |
ffe60014 DG |
1147 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1148 | ERR("UST app event %s filter failed for app (pid: %d) " | |
1149 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1150 | } else { | |
3757b385 DG |
1151 | /* |
1152 | * This is normal behavior, an application can die during the | |
1153 | * creation process. Don't report an error so the execution can | |
1154 | * continue normally. | |
1155 | */ | |
1156 | ret = 0; | |
ffe60014 DG |
1157 | DBG3("UST app filter event failed. Application is dead."); |
1158 | } | |
53a80697 MD |
1159 | goto error; |
1160 | } | |
1161 | ||
1162 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
1163 | ||
1164 | error: | |
840cb59c | 1165 | health_code_update(); |
53a80697 MD |
1166 | return ret; |
1167 | } | |
1168 | ||
7cc9a73c JI |
1169 | /* |
1170 | * Set event exclusions on the tracer. | |
1171 | */ | |
1172 | static | |
1173 | int set_ust_event_exclusion(struct ust_app_event *ua_event, | |
1174 | struct ust_app *app) | |
1175 | { | |
1176 | int ret; | |
1177 | ||
1178 | health_code_update(); | |
1179 | ||
1180 | if (!ua_event->exclusion || !ua_event->exclusion->count) { | |
1181 | ret = 0; | |
1182 | goto error; | |
1183 | } | |
1184 | ||
1185 | ret = ustctl_set_exclusion(app->sock, ua_event->exclusion, | |
1186 | ua_event->obj); | |
1187 | if (ret < 0) { | |
1188 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1189 | ERR("UST app event %s exclusions failed for app (pid: %d) " | |
1190 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1191 | } else { | |
1192 | /* | |
1193 | * This is normal behavior, an application can die during the | |
1194 | * creation process. Don't report an error so the execution can | |
1195 | * continue normally. | |
1196 | */ | |
1197 | ret = 0; | |
1198 | DBG3("UST app event exclusion failed. Application is dead."); | |
1199 | } | |
1200 | goto error; | |
1201 | } | |
1202 | ||
1203 | DBG2("UST exclusion set successfully for event %s", ua_event->name); | |
1204 | ||
1205 | error: | |
1206 | health_code_update(); | |
1207 | return ret; | |
1208 | } | |
1209 | ||
9730260e DG |
1210 | /* |
1211 | * Disable the specified event on to UST tracer for the UST session. | |
1212 | */ | |
1213 | static int disable_ust_event(struct ust_app *app, | |
1214 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1215 | { | |
1216 | int ret; | |
1217 | ||
840cb59c | 1218 | health_code_update(); |
86acf0da | 1219 | |
852d0037 | 1220 | ret = ustctl_disable(app->sock, ua_event->obj); |
9730260e | 1221 | if (ret < 0) { |
ffe60014 DG |
1222 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1223 | ERR("UST app event %s disable failed for app (pid: %d) " | |
1224 | "and session handle %d with ret %d", | |
1225 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1226 | } else { | |
3757b385 DG |
1227 | /* |
1228 | * This is normal behavior, an application can die during the | |
1229 | * creation process. Don't report an error so the execution can | |
1230 | * continue normally. | |
1231 | */ | |
1232 | ret = 0; | |
ffe60014 DG |
1233 | DBG3("UST app disable event failed. Application is dead."); |
1234 | } | |
9730260e DG |
1235 | goto error; |
1236 | } | |
1237 | ||
1238 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 1239 | ua_event->attr.name, app->pid); |
9730260e DG |
1240 | |
1241 | error: | |
840cb59c | 1242 | health_code_update(); |
9730260e DG |
1243 | return ret; |
1244 | } | |
1245 | ||
78f0bacd DG |
1246 | /* |
1247 | * Disable the specified channel on to UST tracer for the UST session. | |
1248 | */ | |
1249 | static int disable_ust_channel(struct ust_app *app, | |
1250 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1251 | { | |
1252 | int ret; | |
1253 | ||
840cb59c | 1254 | health_code_update(); |
86acf0da | 1255 | |
852d0037 | 1256 | ret = ustctl_disable(app->sock, ua_chan->obj); |
78f0bacd | 1257 | if (ret < 0) { |
ffe60014 DG |
1258 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1259 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1260 | "and session handle %d with ret %d", | |
1261 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1262 | } else { | |
3757b385 DG |
1263 | /* |
1264 | * This is normal behavior, an application can die during the | |
1265 | * creation process. Don't report an error so the execution can | |
1266 | * continue normally. | |
1267 | */ | |
1268 | ret = 0; | |
ffe60014 DG |
1269 | DBG3("UST app disable channel failed. Application is dead."); |
1270 | } | |
78f0bacd DG |
1271 | goto error; |
1272 | } | |
1273 | ||
78f0bacd | 1274 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1275 | ua_chan->name, app->pid); |
78f0bacd DG |
1276 | |
1277 | error: | |
840cb59c | 1278 | health_code_update(); |
78f0bacd DG |
1279 | return ret; |
1280 | } | |
1281 | ||
1282 | /* | |
1283 | * Enable the specified channel on to UST tracer for the UST session. | |
1284 | */ | |
1285 | static int enable_ust_channel(struct ust_app *app, | |
1286 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1287 | { | |
1288 | int ret; | |
1289 | ||
840cb59c | 1290 | health_code_update(); |
86acf0da | 1291 | |
852d0037 | 1292 | ret = ustctl_enable(app->sock, ua_chan->obj); |
78f0bacd | 1293 | if (ret < 0) { |
ffe60014 DG |
1294 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1295 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1296 | "and session handle %d with ret %d", | |
1297 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1298 | } else { | |
3757b385 DG |
1299 | /* |
1300 | * This is normal behavior, an application can die during the | |
1301 | * creation process. Don't report an error so the execution can | |
1302 | * continue normally. | |
1303 | */ | |
1304 | ret = 0; | |
ffe60014 DG |
1305 | DBG3("UST app enable channel failed. Application is dead."); |
1306 | } | |
78f0bacd DG |
1307 | goto error; |
1308 | } | |
1309 | ||
1310 | ua_chan->enabled = 1; | |
1311 | ||
1312 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1313 | ua_chan->name, app->pid); |
78f0bacd DG |
1314 | |
1315 | error: | |
840cb59c | 1316 | health_code_update(); |
78f0bacd DG |
1317 | return ret; |
1318 | } | |
1319 | ||
edb67388 DG |
1320 | /* |
1321 | * Enable the specified event on to UST tracer for the UST session. | |
1322 | */ | |
1323 | static int enable_ust_event(struct ust_app *app, | |
1324 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1325 | { | |
1326 | int ret; | |
1327 | ||
840cb59c | 1328 | health_code_update(); |
86acf0da | 1329 | |
852d0037 | 1330 | ret = ustctl_enable(app->sock, ua_event->obj); |
edb67388 | 1331 | if (ret < 0) { |
ffe60014 DG |
1332 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1333 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1334 | "and session handle %d with ret %d", | |
1335 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1336 | } else { | |
3757b385 DG |
1337 | /* |
1338 | * This is normal behavior, an application can die during the | |
1339 | * creation process. Don't report an error so the execution can | |
1340 | * continue normally. | |
1341 | */ | |
1342 | ret = 0; | |
ffe60014 DG |
1343 | DBG3("UST app enable event failed. Application is dead."); |
1344 | } | |
edb67388 DG |
1345 | goto error; |
1346 | } | |
1347 | ||
1348 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1349 | ua_event->attr.name, app->pid); |
edb67388 DG |
1350 | |
1351 | error: | |
840cb59c | 1352 | health_code_update(); |
edb67388 DG |
1353 | return ret; |
1354 | } | |
1355 | ||
099e26bd | 1356 | /* |
7972aab2 | 1357 | * Send channel and stream buffer to application. |
4f3ab6ee | 1358 | * |
ffe60014 | 1359 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1360 | */ |
7972aab2 DG |
1361 | static int send_channel_pid_to_ust(struct ust_app *app, |
1362 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1363 | { |
1364 | int ret; | |
ffe60014 | 1365 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1366 | |
1367 | assert(app); | |
ffe60014 | 1368 | assert(ua_sess); |
4f3ab6ee | 1369 | assert(ua_chan); |
4f3ab6ee | 1370 | |
840cb59c | 1371 | health_code_update(); |
4f3ab6ee | 1372 | |
7972aab2 DG |
1373 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1374 | app->sock); | |
86acf0da | 1375 | |
ffe60014 DG |
1376 | /* Send channel to the application. */ |
1377 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
31cb5470 MD |
1378 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1379 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1380 | goto error; | |
1381 | } else if (ret < 0) { | |
b551a063 DG |
1382 | goto error; |
1383 | } | |
1384 | ||
d88aee68 DG |
1385 | health_code_update(); |
1386 | ||
ffe60014 DG |
1387 | /* Send all streams to application. */ |
1388 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1389 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
31cb5470 MD |
1390 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1391 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1392 | goto error; | |
1393 | } else if (ret < 0) { | |
ffe60014 DG |
1394 | goto error; |
1395 | } | |
1396 | /* We don't need the stream anymore once sent to the tracer. */ | |
1397 | cds_list_del(&stream->list); | |
1398 | delete_ust_app_stream(-1, stream); | |
1399 | } | |
ffe60014 DG |
1400 | /* Flag the channel that it is sent to the application. */ |
1401 | ua_chan->is_sent = 1; | |
ffe60014 | 1402 | |
b551a063 | 1403 | error: |
840cb59c | 1404 | health_code_update(); |
b551a063 DG |
1405 | return ret; |
1406 | } | |
1407 | ||
91d76f53 | 1408 | /* |
5b4a0ec0 | 1409 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1410 | * |
1411 | * Should be called with session mutex held. | |
91d76f53 | 1412 | */ |
edb67388 DG |
1413 | static |
1414 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1415 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1416 | { |
5b4a0ec0 | 1417 | int ret = 0; |
284d8f55 | 1418 | |
840cb59c | 1419 | health_code_update(); |
86acf0da | 1420 | |
5b4a0ec0 | 1421 | /* Create UST event on tracer */ |
852d0037 | 1422 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 DG |
1423 | &ua_event->obj); |
1424 | if (ret < 0) { | |
ffe60014 DG |
1425 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1426 | ERR("Error ustctl create event %s for app pid: %d with ret %d", | |
1427 | ua_event->attr.name, app->pid, ret); | |
1428 | } else { | |
3757b385 DG |
1429 | /* |
1430 | * This is normal behavior, an application can die during the | |
1431 | * creation process. Don't report an error so the execution can | |
1432 | * continue normally. | |
1433 | */ | |
1434 | ret = 0; | |
ffe60014 DG |
1435 | DBG3("UST app create event failed. Application is dead."); |
1436 | } | |
5b4a0ec0 | 1437 | goto error; |
91d76f53 | 1438 | } |
f6a9efaa | 1439 | |
5b4a0ec0 | 1440 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1441 | |
5b4a0ec0 | 1442 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1443 | ua_event->attr.name, app->pid); |
f6a9efaa | 1444 | |
840cb59c | 1445 | health_code_update(); |
86acf0da | 1446 | |
025faf73 DG |
1447 | /* Set filter if one is present. */ |
1448 | if (ua_event->filter) { | |
1449 | ret = set_ust_event_filter(ua_event, app); | |
1450 | if (ret < 0) { | |
1451 | goto error; | |
1452 | } | |
1453 | } | |
1454 | ||
7cc9a73c JI |
1455 | /* Set exclusions for the event */ |
1456 | if (ua_event->exclusion) { | |
1457 | ret = set_ust_event_exclusion(ua_event, app); | |
1458 | if (ret < 0) { | |
1459 | goto error; | |
1460 | } | |
1461 | } | |
1462 | ||
8535a6d9 | 1463 | /* If event not enabled, disable it on the tracer */ |
3a400966 MD |
1464 | if (ua_event->enabled) { |
1465 | /* | |
1466 | * We now need to explicitly enable the event, since it | |
1467 | * is now disabled at creation. | |
1468 | */ | |
1469 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1470 | if (ret < 0) { | |
1471 | /* | |
1472 | * If we hit an EPERM, something is wrong with our enable call. If | |
1473 | * we get an EEXIST, there is a problem on the tracer side since we | |
1474 | * just created it. | |
1475 | */ | |
1476 | switch (ret) { | |
1477 | case -LTTNG_UST_ERR_PERM: | |
1478 | /* Code flow problem */ | |
1479 | assert(0); | |
1480 | case -LTTNG_UST_ERR_EXIST: | |
1481 | /* It's OK for our use case. */ | |
1482 | ret = 0; | |
1483 | break; | |
1484 | default: | |
1485 | break; | |
1486 | } | |
1487 | goto error; | |
1488 | } | |
1489 | } else { | |
8535a6d9 DG |
1490 | ret = disable_ust_event(app, ua_sess, ua_event); |
1491 | if (ret < 0) { | |
fc34caaa DG |
1492 | /* |
1493 | * If we hit an EPERM, something is wrong with our disable call. If | |
1494 | * we get an EEXIST, there is a problem on the tracer side since we | |
1495 | * just created it. | |
1496 | */ | |
1497 | switch (ret) { | |
49c336c1 | 1498 | case -LTTNG_UST_ERR_PERM: |
fc34caaa DG |
1499 | /* Code flow problem */ |
1500 | assert(0); | |
49c336c1 | 1501 | case -LTTNG_UST_ERR_EXIST: |
fc34caaa DG |
1502 | /* It's OK for our use case. */ |
1503 | ret = 0; | |
1504 | break; | |
1505 | default: | |
1506 | break; | |
1507 | } | |
8535a6d9 DG |
1508 | goto error; |
1509 | } | |
1510 | } | |
1511 | ||
5b4a0ec0 | 1512 | error: |
840cb59c | 1513 | health_code_update(); |
5b4a0ec0 | 1514 | return ret; |
91d76f53 | 1515 | } |
48842b30 | 1516 | |
5b4a0ec0 DG |
1517 | /* |
1518 | * Copy data between an UST app event and a LTT event. | |
1519 | */ | |
421cb601 | 1520 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1521 | struct ltt_ust_event *uevent) |
1522 | { | |
b4ffad32 JI |
1523 | size_t exclusion_alloc_size; |
1524 | ||
48842b30 DG |
1525 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); |
1526 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1527 | ||
fc34caaa DG |
1528 | ua_event->enabled = uevent->enabled; |
1529 | ||
5b4a0ec0 DG |
1530 | /* Copy event attributes */ |
1531 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1532 | ||
53a80697 MD |
1533 | /* Copy filter bytecode */ |
1534 | if (uevent->filter) { | |
025faf73 DG |
1535 | ua_event->filter = alloc_copy_ust_app_filter(uevent->filter); |
1536 | /* Filter might be NULL here in case of ENONEM. */ | |
53a80697 | 1537 | } |
b4ffad32 JI |
1538 | |
1539 | /* Copy exclusion data */ | |
1540 | if (uevent->exclusion) { | |
1541 | exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) + | |
1542 | LTTNG_UST_SYM_NAME_LEN * uevent->exclusion->count; | |
1543 | ua_event->exclusion = zmalloc(exclusion_alloc_size); | |
5f8df26c JI |
1544 | if (ua_event->exclusion == NULL) { |
1545 | PERROR("malloc"); | |
1546 | } else { | |
1547 | memcpy(ua_event->exclusion, uevent->exclusion, | |
1548 | exclusion_alloc_size); | |
b4ffad32 JI |
1549 | } |
1550 | } | |
48842b30 DG |
1551 | } |
1552 | ||
5b4a0ec0 DG |
1553 | /* |
1554 | * Copy data between an UST app channel and a LTT channel. | |
1555 | */ | |
421cb601 | 1556 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1557 | struct ltt_ust_channel *uchan) |
1558 | { | |
bec39940 | 1559 | struct lttng_ht_iter iter; |
48842b30 | 1560 | struct ltt_ust_event *uevent; |
55cc08a6 | 1561 | struct ltt_ust_context *uctx; |
48842b30 | 1562 | struct ust_app_event *ua_event; |
55cc08a6 | 1563 | struct ust_app_ctx *ua_ctx; |
48842b30 | 1564 | |
fc34caaa | 1565 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1566 | |
1567 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1568 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 1569 | |
1624d5b7 JD |
1570 | ua_chan->tracefile_size = uchan->tracefile_size; |
1571 | ua_chan->tracefile_count = uchan->tracefile_count; | |
1572 | ||
ffe60014 DG |
1573 | /* Copy event attributes since the layout is different. */ |
1574 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1575 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1576 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1577 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1578 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
1579 | ua_chan->attr.output = uchan->attr.output; | |
1580 | /* | |
1581 | * Note that the attribute channel type is not set since the channel on the | |
1582 | * tracing registry side does not have this information. | |
1583 | */ | |
48842b30 | 1584 | |
fc34caaa | 1585 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1586 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1587 | |
31746f93 | 1588 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { |
55cc08a6 DG |
1589 | ua_ctx = alloc_ust_app_ctx(&uctx->ctx); |
1590 | if (ua_ctx == NULL) { | |
1591 | continue; | |
1592 | } | |
bec39940 DG |
1593 | lttng_ht_node_init_ulong(&ua_ctx->node, |
1594 | (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 1595 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 1596 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
55cc08a6 | 1597 | } |
48842b30 | 1598 | |
421cb601 | 1599 | /* Copy all events from ltt ust channel to ust app channel */ |
bec39940 | 1600 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
18eace3b | 1601 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 1602 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 1603 | if (ua_event == NULL) { |
421cb601 | 1604 | DBG2("UST event %s not found on shadow copy channel", |
48842b30 | 1605 | uevent->attr.name); |
284d8f55 | 1606 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
48842b30 | 1607 | if (ua_event == NULL) { |
5b4a0ec0 | 1608 | continue; |
48842b30 | 1609 | } |
421cb601 | 1610 | shadow_copy_event(ua_event, uevent); |
d0b96690 | 1611 | add_unique_ust_app_event(ua_chan, ua_event); |
48842b30 | 1612 | } |
48842b30 DG |
1613 | } |
1614 | ||
fc34caaa | 1615 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1616 | } |
1617 | ||
5b4a0ec0 DG |
1618 | /* |
1619 | * Copy data between a UST app session and a regular LTT session. | |
1620 | */ | |
421cb601 | 1621 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1622 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1623 | { |
bec39940 DG |
1624 | struct lttng_ht_node_str *ua_chan_node; |
1625 | struct lttng_ht_iter iter; | |
48842b30 DG |
1626 | struct ltt_ust_channel *uchan; |
1627 | struct ust_app_channel *ua_chan; | |
477d7741 MD |
1628 | time_t rawtime; |
1629 | struct tm *timeinfo; | |
1630 | char datetime[16]; | |
1631 | int ret; | |
1632 | ||
1633 | /* Get date and time for unique app path */ | |
1634 | time(&rawtime); | |
1635 | timeinfo = localtime(&rawtime); | |
1636 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1637 | |
421cb601 | 1638 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1639 | |
7972aab2 DG |
1640 | ua_sess->tracing_id = usess->id; |
1641 | ua_sess->id = get_next_session_id(); | |
1642 | ua_sess->uid = app->uid; | |
1643 | ua_sess->gid = app->gid; | |
1644 | ua_sess->euid = usess->uid; | |
1645 | ua_sess->egid = usess->gid; | |
1646 | ua_sess->buffer_type = usess->buffer_type; | |
1647 | ua_sess->bits_per_long = app->bits_per_long; | |
1648 | /* There is only one consumer object per session possible. */ | |
1649 | ua_sess->consumer = usess->consumer; | |
2bba9e53 | 1650 | ua_sess->output_traces = usess->output_traces; |
ecc48a90 | 1651 | ua_sess->live_timer_interval = usess->live_timer_interval; |
84ad93e8 DG |
1652 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, |
1653 | &usess->metadata_attr); | |
7972aab2 DG |
1654 | |
1655 | switch (ua_sess->buffer_type) { | |
1656 | case LTTNG_BUFFER_PER_PID: | |
1657 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 1658 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
1659 | datetime); |
1660 | break; | |
1661 | case LTTNG_BUFFER_PER_UID: | |
1662 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1663 | DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long); | |
1664 | break; | |
1665 | default: | |
1666 | assert(0); | |
1667 | goto error; | |
1668 | } | |
477d7741 MD |
1669 | if (ret < 0) { |
1670 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1671 | assert(0); |
7972aab2 | 1672 | goto error; |
477d7741 MD |
1673 | } |
1674 | ||
48842b30 | 1675 | /* Iterate over all channels in global domain. */ |
bec39940 DG |
1676 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, |
1677 | uchan, node.node) { | |
1678 | struct lttng_ht_iter uiter; | |
ba767faf | 1679 | |
bec39940 DG |
1680 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
1681 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
5b4a0ec0 | 1682 | if (ua_chan_node != NULL) { |
fc34caaa | 1683 | /* Session exist. Contiuing. */ |
5b4a0ec0 DG |
1684 | continue; |
1685 | } | |
421cb601 | 1686 | |
5b4a0ec0 DG |
1687 | DBG2("Channel %s not found on shadow session copy, creating it", |
1688 | uchan->name); | |
d0b96690 | 1689 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
5b4a0ec0 | 1690 | if (ua_chan == NULL) { |
fc34caaa | 1691 | /* malloc failed FIXME: Might want to do handle ENOMEM .. */ |
5b4a0ec0 | 1692 | continue; |
48842b30 | 1693 | } |
5b4a0ec0 | 1694 | shadow_copy_channel(ua_chan, uchan); |
ffe60014 DG |
1695 | /* |
1696 | * The concept of metadata channel does not exist on the tracing | |
1697 | * registry side of the session daemon so this can only be a per CPU | |
1698 | * channel and not metadata. | |
1699 | */ | |
1700 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
1701 | ||
bec39940 | 1702 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); |
48842b30 | 1703 | } |
7972aab2 DG |
1704 | |
1705 | error: | |
1706 | return; | |
48842b30 DG |
1707 | } |
1708 | ||
78f0bacd DG |
1709 | /* |
1710 | * Lookup sesison wrapper. | |
1711 | */ | |
84cd17c6 MD |
1712 | static |
1713 | void __lookup_session_by_app(struct ltt_ust_session *usess, | |
bec39940 | 1714 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1715 | { |
1716 | /* Get right UST app session from app */ | |
d9bf3ca4 | 1717 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
1718 | } |
1719 | ||
421cb601 DG |
1720 | /* |
1721 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1722 | * id. |
421cb601 | 1723 | */ |
48842b30 DG |
1724 | static struct ust_app_session *lookup_session_by_app( |
1725 | struct ltt_ust_session *usess, struct ust_app *app) | |
1726 | { | |
bec39940 | 1727 | struct lttng_ht_iter iter; |
d9bf3ca4 | 1728 | struct lttng_ht_node_u64 *node; |
48842b30 | 1729 | |
84cd17c6 | 1730 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 1731 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
1732 | if (node == NULL) { |
1733 | goto error; | |
1734 | } | |
1735 | ||
1736 | return caa_container_of(node, struct ust_app_session, node); | |
1737 | ||
1738 | error: | |
1739 | return NULL; | |
1740 | } | |
1741 | ||
7972aab2 DG |
1742 | /* |
1743 | * Setup buffer registry per PID for the given session and application. If none | |
1744 | * is found, a new one is created, added to the global registry and | |
1745 | * initialized. If regp is valid, it's set with the newly created object. | |
1746 | * | |
1747 | * Return 0 on success or else a negative value. | |
1748 | */ | |
1749 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
1750 | struct ust_app *app, struct buffer_reg_pid **regp) | |
1751 | { | |
1752 | int ret = 0; | |
1753 | struct buffer_reg_pid *reg_pid; | |
1754 | ||
1755 | assert(ua_sess); | |
1756 | assert(app); | |
1757 | ||
1758 | rcu_read_lock(); | |
1759 | ||
1760 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
1761 | if (!reg_pid) { | |
1762 | /* | |
1763 | * This is the create channel path meaning that if there is NO | |
1764 | * registry available, we have to create one for this session. | |
1765 | */ | |
1766 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid); | |
1767 | if (ret < 0) { | |
1768 | goto error; | |
1769 | } | |
1770 | buffer_reg_pid_add(reg_pid); | |
1771 | } else { | |
1772 | goto end; | |
1773 | } | |
1774 | ||
1775 | /* Initialize registry. */ | |
1776 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
1777 | app->bits_per_long, app->uint8_t_alignment, | |
1778 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1779 | app->uint64_t_alignment, app->long_alignment, |
1780 | app->byte_order, app->version.major, | |
1781 | app->version.minor); | |
7972aab2 DG |
1782 | if (ret < 0) { |
1783 | goto error; | |
1784 | } | |
1785 | ||
1786 | DBG3("UST app buffer registry per PID created successfully"); | |
1787 | ||
1788 | end: | |
1789 | if (regp) { | |
1790 | *regp = reg_pid; | |
1791 | } | |
1792 | error: | |
1793 | rcu_read_unlock(); | |
1794 | return ret; | |
1795 | } | |
1796 | ||
1797 | /* | |
1798 | * Setup buffer registry per UID for the given session and application. If none | |
1799 | * is found, a new one is created, added to the global registry and | |
1800 | * initialized. If regp is valid, it's set with the newly created object. | |
1801 | * | |
1802 | * Return 0 on success or else a negative value. | |
1803 | */ | |
1804 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
1805 | struct ust_app *app, struct buffer_reg_uid **regp) | |
1806 | { | |
1807 | int ret = 0; | |
1808 | struct buffer_reg_uid *reg_uid; | |
1809 | ||
1810 | assert(usess); | |
1811 | assert(app); | |
1812 | ||
1813 | rcu_read_lock(); | |
1814 | ||
1815 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
1816 | if (!reg_uid) { | |
1817 | /* | |
1818 | * This is the create channel path meaning that if there is NO | |
1819 | * registry available, we have to create one for this session. | |
1820 | */ | |
1821 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
1822 | LTTNG_DOMAIN_UST, ®_uid); | |
1823 | if (ret < 0) { | |
1824 | goto error; | |
1825 | } | |
1826 | buffer_reg_uid_add(reg_uid); | |
1827 | } else { | |
1828 | goto end; | |
1829 | } | |
1830 | ||
1831 | /* Initialize registry. */ | |
af6142cf | 1832 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
1833 | app->bits_per_long, app->uint8_t_alignment, |
1834 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1835 | app->uint64_t_alignment, app->long_alignment, |
1836 | app->byte_order, app->version.major, | |
1837 | app->version.minor); | |
7972aab2 DG |
1838 | if (ret < 0) { |
1839 | goto error; | |
1840 | } | |
1841 | /* Add node to teardown list of the session. */ | |
1842 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
1843 | ||
1844 | DBG3("UST app buffer registry per UID created successfully"); | |
1845 | ||
1846 | end: | |
1847 | if (regp) { | |
1848 | *regp = reg_uid; | |
1849 | } | |
1850 | error: | |
1851 | rcu_read_unlock(); | |
1852 | return ret; | |
1853 | } | |
1854 | ||
421cb601 | 1855 | /* |
3d8ca23b | 1856 | * Create a session on the tracer side for the given app. |
421cb601 | 1857 | * |
3d8ca23b DG |
1858 | * On success, ua_sess_ptr is populated with the session pointer or else left |
1859 | * untouched. If the session was created, is_created is set to 1. On error, | |
1860 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
1861 | * be NULL. | |
1862 | * | |
1863 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
1864 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 1865 | */ |
3d8ca23b DG |
1866 | static int create_ust_app_session(struct ltt_ust_session *usess, |
1867 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, | |
1868 | int *is_created) | |
421cb601 | 1869 | { |
3d8ca23b | 1870 | int ret, created = 0; |
421cb601 DG |
1871 | struct ust_app_session *ua_sess; |
1872 | ||
3d8ca23b DG |
1873 | assert(usess); |
1874 | assert(app); | |
1875 | assert(ua_sess_ptr); | |
1876 | ||
840cb59c | 1877 | health_code_update(); |
86acf0da | 1878 | |
421cb601 DG |
1879 | ua_sess = lookup_session_by_app(usess, app); |
1880 | if (ua_sess == NULL) { | |
d9bf3ca4 | 1881 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 1882 | app->pid, usess->id); |
d0b96690 | 1883 | ua_sess = alloc_ust_app_session(app); |
421cb601 DG |
1884 | if (ua_sess == NULL) { |
1885 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
1886 | ret = -ENOMEM; |
1887 | goto error; | |
421cb601 | 1888 | } |
477d7741 | 1889 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 1890 | created = 1; |
421cb601 DG |
1891 | } |
1892 | ||
7972aab2 DG |
1893 | switch (usess->buffer_type) { |
1894 | case LTTNG_BUFFER_PER_PID: | |
1895 | /* Init local registry. */ | |
1896 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 1897 | if (ret < 0) { |
7972aab2 DG |
1898 | goto error; |
1899 | } | |
1900 | break; | |
1901 | case LTTNG_BUFFER_PER_UID: | |
1902 | /* Look for a global registry. If none exists, create one. */ | |
1903 | ret = setup_buffer_reg_uid(usess, app, NULL); | |
1904 | if (ret < 0) { | |
1905 | goto error; | |
1906 | } | |
1907 | break; | |
1908 | default: | |
1909 | assert(0); | |
1910 | ret = -EINVAL; | |
1911 | goto error; | |
1912 | } | |
1913 | ||
1914 | health_code_update(); | |
1915 | ||
1916 | if (ua_sess->handle == -1) { | |
1917 | ret = ustctl_create_session(app->sock); | |
1918 | if (ret < 0) { | |
1919 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1920 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
1921 | app->pid, ret); |
1922 | } else { | |
1923 | DBG("UST app creating session failed. Application is dead"); | |
3757b385 DG |
1924 | /* |
1925 | * This is normal behavior, an application can die during the | |
1926 | * creation process. Don't report an error so the execution can | |
1927 | * continue normally. This will get flagged ENOTCONN and the | |
1928 | * caller will handle it. | |
1929 | */ | |
1930 | ret = 0; | |
ffe60014 | 1931 | } |
d0b96690 | 1932 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
1933 | if (ret != -ENOMEM) { |
1934 | /* | |
1935 | * Tracer is probably gone or got an internal error so let's | |
1936 | * behave like it will soon unregister or not usable. | |
1937 | */ | |
1938 | ret = -ENOTCONN; | |
1939 | } | |
1940 | goto error; | |
421cb601 DG |
1941 | } |
1942 | ||
7972aab2 DG |
1943 | ua_sess->handle = ret; |
1944 | ||
1945 | /* Add ust app session to app's HT */ | |
d9bf3ca4 MD |
1946 | lttng_ht_node_init_u64(&ua_sess->node, |
1947 | ua_sess->tracing_id); | |
1948 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
7972aab2 DG |
1949 | |
1950 | DBG2("UST app session created successfully with handle %d", ret); | |
1951 | } | |
1952 | ||
1953 | *ua_sess_ptr = ua_sess; | |
1954 | if (is_created) { | |
1955 | *is_created = created; | |
1956 | } | |
1957 | ||
1958 | /* Everything went well. */ | |
1959 | ret = 0; | |
1960 | ||
1961 | error: | |
1962 | health_code_update(); | |
1963 | return ret; | |
1964 | } | |
1965 | ||
394235f5 JG |
1966 | /* |
1967 | * Match function for a hash table lookup of ust_app_ctx. | |
1968 | * | |
1969 | * It matches an ust app context based on the context type and, in the case | |
1970 | * of perf counters, their name. | |
1971 | */ | |
1972 | static int ht_match_ust_app_ctx(struct cds_lfht_node *node, const void *_key) | |
1973 | { | |
1974 | struct ust_app_ctx *ctx; | |
1975 | const struct lttng_ust_context *key; | |
1976 | ||
1977 | assert(node); | |
1978 | assert(_key); | |
1979 | ||
1980 | ctx = caa_container_of(node, struct ust_app_ctx, node.node); | |
1981 | key = _key; | |
1982 | ||
1983 | /* Context type */ | |
1984 | if (ctx->ctx.ctx != key->ctx) { | |
1985 | goto no_match; | |
1986 | } | |
1987 | ||
1988 | /* Check the name in the case of perf thread counters. */ | |
1989 | if (key->ctx == LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER) { | |
1990 | if (strncmp(key->u.perf_counter.name, | |
1991 | ctx->ctx.u.perf_counter.name, | |
1992 | sizeof(key->u.perf_counter.name))) { | |
1993 | goto no_match; | |
1994 | } | |
1995 | } | |
1996 | ||
1997 | /* Match. */ | |
1998 | return 1; | |
1999 | ||
2000 | no_match: | |
2001 | return 0; | |
2002 | } | |
2003 | ||
2004 | /* | |
2005 | * Lookup for an ust app context from an lttng_ust_context. | |
2006 | * | |
a4b56f4f | 2007 | * Must be called while holding RCU read side lock. |
394235f5 JG |
2008 | * Return an ust_app_ctx object or NULL on error. |
2009 | */ | |
2010 | static | |
2011 | struct ust_app_ctx *find_ust_app_context(struct lttng_ht *ht, | |
2012 | struct lttng_ust_context *uctx) | |
2013 | { | |
2014 | struct lttng_ht_iter iter; | |
2015 | struct lttng_ht_node_ulong *node; | |
2016 | struct ust_app_ctx *app_ctx = NULL; | |
2017 | ||
2018 | assert(uctx); | |
2019 | assert(ht); | |
2020 | ||
2021 | /* Lookup using the lttng_ust_context_type and a custom match fct. */ | |
2022 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) uctx->ctx, lttng_ht_seed), | |
2023 | ht_match_ust_app_ctx, uctx, &iter.iter); | |
2024 | node = lttng_ht_iter_get_node_ulong(&iter); | |
2025 | if (!node) { | |
2026 | goto end; | |
2027 | } | |
2028 | ||
2029 | app_ctx = caa_container_of(node, struct ust_app_ctx, node); | |
2030 | ||
2031 | end: | |
2032 | return app_ctx; | |
2033 | } | |
2034 | ||
7972aab2 DG |
2035 | /* |
2036 | * Create a context for the channel on the tracer. | |
2037 | * | |
2038 | * Called with UST app session lock held and a RCU read side lock. | |
2039 | */ | |
2040 | static | |
2041 | int create_ust_app_channel_context(struct ust_app_session *ua_sess, | |
2042 | struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx, | |
2043 | struct ust_app *app) | |
2044 | { | |
2045 | int ret = 0; | |
7972aab2 DG |
2046 | struct ust_app_ctx *ua_ctx; |
2047 | ||
2048 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
2049 | ||
394235f5 JG |
2050 | ua_ctx = find_ust_app_context(ua_chan->ctx, uctx); |
2051 | if (ua_ctx) { | |
7972aab2 DG |
2052 | ret = -EEXIST; |
2053 | goto error; | |
2054 | } | |
2055 | ||
2056 | ua_ctx = alloc_ust_app_ctx(uctx); | |
2057 | if (ua_ctx == NULL) { | |
2058 | /* malloc failed */ | |
2059 | ret = -1; | |
2060 | goto error; | |
2061 | } | |
2062 | ||
2063 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 2064 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 2065 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
2066 | |
2067 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
2068 | if (ret < 0) { | |
2069 | goto error; | |
2070 | } | |
2071 | ||
2072 | error: | |
2073 | return ret; | |
2074 | } | |
2075 | ||
2076 | /* | |
2077 | * Enable on the tracer side a ust app event for the session and channel. | |
2078 | * | |
2079 | * Called with UST app session lock held. | |
2080 | */ | |
2081 | static | |
2082 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
2083 | struct ust_app_event *ua_event, struct ust_app *app) | |
2084 | { | |
2085 | int ret; | |
2086 | ||
2087 | ret = enable_ust_event(app, ua_sess, ua_event); | |
2088 | if (ret < 0) { | |
2089 | goto error; | |
2090 | } | |
2091 | ||
2092 | ua_event->enabled = 1; | |
2093 | ||
2094 | error: | |
2095 | return ret; | |
2096 | } | |
2097 | ||
2098 | /* | |
2099 | * Disable on the tracer side a ust app event for the session and channel. | |
2100 | */ | |
2101 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
2102 | struct ust_app_event *ua_event, struct ust_app *app) | |
2103 | { | |
2104 | int ret; | |
2105 | ||
2106 | ret = disable_ust_event(app, ua_sess, ua_event); | |
2107 | if (ret < 0) { | |
2108 | goto error; | |
2109 | } | |
2110 | ||
2111 | ua_event->enabled = 0; | |
2112 | ||
2113 | error: | |
2114 | return ret; | |
2115 | } | |
2116 | ||
2117 | /* | |
2118 | * Lookup ust app channel for session and disable it on the tracer side. | |
2119 | */ | |
2120 | static | |
2121 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
2122 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
2123 | { | |
2124 | int ret; | |
2125 | ||
2126 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2127 | if (ret < 0) { | |
2128 | goto error; | |
2129 | } | |
2130 | ||
2131 | ua_chan->enabled = 0; | |
2132 | ||
2133 | error: | |
2134 | return ret; | |
2135 | } | |
2136 | ||
2137 | /* | |
2138 | * Lookup ust app channel for session and enable it on the tracer side. This | |
2139 | * MUST be called with a RCU read side lock acquired. | |
2140 | */ | |
2141 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
2142 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
2143 | { | |
2144 | int ret = 0; | |
2145 | struct lttng_ht_iter iter; | |
2146 | struct lttng_ht_node_str *ua_chan_node; | |
2147 | struct ust_app_channel *ua_chan; | |
2148 | ||
2149 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
2150 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
2151 | if (ua_chan_node == NULL) { | |
d9bf3ca4 | 2152 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
2153 | uchan->name, ua_sess->tracing_id); |
2154 | goto error; | |
2155 | } | |
2156 | ||
2157 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2158 | ||
2159 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
2160 | if (ret < 0) { | |
2161 | goto error; | |
2162 | } | |
2163 | ||
2164 | error: | |
2165 | return ret; | |
2166 | } | |
2167 | ||
2168 | /* | |
2169 | * Ask the consumer to create a channel and get it if successful. | |
2170 | * | |
2171 | * Return 0 on success or else a negative value. | |
2172 | */ | |
2173 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
2174 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
2175 | int bitness, struct ust_registry_session *registry) | |
2176 | { | |
2177 | int ret; | |
2178 | unsigned int nb_fd = 0; | |
2179 | struct consumer_socket *socket; | |
2180 | ||
2181 | assert(usess); | |
2182 | assert(ua_sess); | |
2183 | assert(ua_chan); | |
2184 | assert(registry); | |
2185 | ||
2186 | rcu_read_lock(); | |
2187 | health_code_update(); | |
2188 | ||
2189 | /* Get the right consumer socket for the application. */ | |
2190 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
2191 | if (!socket) { | |
2192 | ret = -EINVAL; | |
2193 | goto error; | |
2194 | } | |
2195 | ||
2196 | health_code_update(); | |
2197 | ||
2198 | /* Need one fd for the channel. */ | |
2199 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2200 | if (ret < 0) { | |
2201 | ERR("Exhausted number of available FD upon create channel"); | |
2202 | goto error; | |
2203 | } | |
2204 | ||
2205 | /* | |
2206 | * Ask consumer to create channel. The consumer will return the number of | |
2207 | * stream we have to expect. | |
2208 | */ | |
2209 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
2210 | registry); | |
2211 | if (ret < 0) { | |
2212 | goto error_ask; | |
2213 | } | |
2214 | ||
2215 | /* | |
2216 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2217 | * stream (2 being the default value here). | |
2218 | */ | |
2219 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2220 | ||
2221 | /* Reserve the amount of file descriptor we need. */ | |
2222 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2223 | if (ret < 0) { | |
2224 | ERR("Exhausted number of available FD upon create channel"); | |
2225 | goto error_fd_get_stream; | |
2226 | } | |
2227 | ||
2228 | health_code_update(); | |
2229 | ||
2230 | /* | |
2231 | * Now get the channel from the consumer. This call wil populate the stream | |
2232 | * list of that channel and set the ust objects. | |
2233 | */ | |
d9078d0c DG |
2234 | if (usess->consumer->enabled) { |
2235 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2236 | if (ret < 0) { | |
2237 | goto error_destroy; | |
2238 | } | |
7972aab2 DG |
2239 | } |
2240 | ||
2241 | rcu_read_unlock(); | |
2242 | return 0; | |
2243 | ||
2244 | error_destroy: | |
2245 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2246 | error_fd_get_stream: | |
2247 | /* | |
2248 | * Initiate a destroy channel on the consumer since we had an error | |
2249 | * handling it on our side. The return value is of no importance since we | |
2250 | * already have a ret value set by the previous error that we need to | |
2251 | * return. | |
2252 | */ | |
2253 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2254 | error_ask: | |
2255 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2256 | error: | |
2257 | health_code_update(); | |
2258 | rcu_read_unlock(); | |
2259 | return ret; | |
2260 | } | |
2261 | ||
2262 | /* | |
2263 | * Duplicate the ust data object of the ust app stream and save it in the | |
2264 | * buffer registry stream. | |
2265 | * | |
2266 | * Return 0 on success or else a negative value. | |
2267 | */ | |
2268 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2269 | struct ust_app_stream *stream) | |
2270 | { | |
2271 | int ret; | |
2272 | ||
2273 | assert(reg_stream); | |
2274 | assert(stream); | |
2275 | ||
2276 | /* Reserve the amount of file descriptor we need. */ | |
2277 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2278 | if (ret < 0) { | |
2279 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2280 | goto error; | |
2281 | } | |
2282 | ||
2283 | /* Duplicate object for stream once the original is in the registry. */ | |
2284 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2285 | reg_stream->obj.ust); | |
2286 | if (ret < 0) { | |
2287 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2288 | reg_stream->obj.ust, stream->obj, ret); | |
2289 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2290 | goto error; | |
2291 | } | |
2292 | stream->handle = stream->obj->handle; | |
2293 | ||
2294 | error: | |
2295 | return ret; | |
2296 | } | |
2297 | ||
2298 | /* | |
2299 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2300 | * buffer registry channel. | |
2301 | * | |
2302 | * Return 0 on success or else a negative value. | |
2303 | */ | |
2304 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2305 | struct ust_app_channel *ua_chan) | |
2306 | { | |
2307 | int ret; | |
2308 | ||
2309 | assert(reg_chan); | |
2310 | assert(ua_chan); | |
2311 | ||
2312 | /* Need two fds for the channel. */ | |
2313 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2314 | if (ret < 0) { | |
2315 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2316 | goto error_fd_get; | |
2317 | } | |
2318 | ||
2319 | /* Duplicate object for stream once the original is in the registry. */ | |
2320 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2321 | if (ret < 0) { | |
2322 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2323 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2324 | goto error; | |
2325 | } | |
2326 | ua_chan->handle = ua_chan->obj->handle; | |
2327 | ||
2328 | return 0; | |
2329 | ||
2330 | error: | |
2331 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2332 | error_fd_get: | |
2333 | return ret; | |
2334 | } | |
2335 | ||
2336 | /* | |
2337 | * For a given channel buffer registry, setup all streams of the given ust | |
2338 | * application channel. | |
2339 | * | |
2340 | * Return 0 on success or else a negative value. | |
2341 | */ | |
2342 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
2343 | struct ust_app_channel *ua_chan) | |
2344 | { | |
2345 | int ret = 0; | |
2346 | struct ust_app_stream *stream, *stmp; | |
2347 | ||
2348 | assert(reg_chan); | |
2349 | assert(ua_chan); | |
2350 | ||
2351 | DBG2("UST app setup buffer registry stream"); | |
2352 | ||
2353 | /* Send all streams to application. */ | |
2354 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2355 | struct buffer_reg_stream *reg_stream; | |
2356 | ||
2357 | ret = buffer_reg_stream_create(®_stream); | |
2358 | if (ret < 0) { | |
2359 | goto error; | |
2360 | } | |
2361 | ||
2362 | /* | |
2363 | * Keep original pointer and nullify it in the stream so the delete | |
2364 | * stream call does not release the object. | |
2365 | */ | |
2366 | reg_stream->obj.ust = stream->obj; | |
2367 | stream->obj = NULL; | |
2368 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2369 | |
7972aab2 DG |
2370 | /* We don't need the streams anymore. */ |
2371 | cds_list_del(&stream->list); | |
2372 | delete_ust_app_stream(-1, stream); | |
2373 | } | |
421cb601 | 2374 | |
7972aab2 DG |
2375 | error: |
2376 | return ret; | |
2377 | } | |
2378 | ||
2379 | /* | |
2380 | * Create a buffer registry channel for the given session registry and | |
2381 | * application channel object. If regp pointer is valid, it's set with the | |
2382 | * created object. Important, the created object is NOT added to the session | |
2383 | * registry hash table. | |
2384 | * | |
2385 | * Return 0 on success else a negative value. | |
2386 | */ | |
2387 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2388 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2389 | { | |
2390 | int ret; | |
2391 | struct buffer_reg_channel *reg_chan = NULL; | |
2392 | ||
2393 | assert(reg_sess); | |
2394 | assert(ua_chan); | |
2395 | ||
2396 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2397 | ||
2398 | /* Create buffer registry channel. */ | |
2399 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2400 | if (ret < 0) { | |
2401 | goto error_create; | |
421cb601 | 2402 | } |
7972aab2 DG |
2403 | assert(reg_chan); |
2404 | reg_chan->consumer_key = ua_chan->key; | |
8c924c7b | 2405 | reg_chan->subbuf_size = ua_chan->attr.subbuf_size; |
135347bd | 2406 | reg_chan->num_subbuf = ua_chan->attr.num_subbuf; |
421cb601 | 2407 | |
7972aab2 DG |
2408 | /* Create and add a channel registry to session. */ |
2409 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2410 | ua_chan->tracing_channel_id); | |
2411 | if (ret < 0) { | |
2412 | goto error; | |
d88aee68 | 2413 | } |
7972aab2 | 2414 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2415 | |
7972aab2 DG |
2416 | if (regp) { |
2417 | *regp = reg_chan; | |
3d8ca23b | 2418 | } |
d88aee68 | 2419 | |
7972aab2 | 2420 | return 0; |
3d8ca23b DG |
2421 | |
2422 | error: | |
7972aab2 DG |
2423 | /* Safe because the registry channel object was not added to any HT. */ |
2424 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2425 | error_create: | |
3d8ca23b | 2426 | return ret; |
421cb601 DG |
2427 | } |
2428 | ||
55cc08a6 | 2429 | /* |
7972aab2 DG |
2430 | * Setup buffer registry channel for the given session registry and application |
2431 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2432 | * |
7972aab2 | 2433 | * Return 0 on success else a negative value. |
55cc08a6 | 2434 | */ |
7972aab2 DG |
2435 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
2436 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan) | |
55cc08a6 | 2437 | { |
7972aab2 | 2438 | int ret; |
55cc08a6 | 2439 | |
7972aab2 DG |
2440 | assert(reg_sess); |
2441 | assert(reg_chan); | |
2442 | assert(ua_chan); | |
2443 | assert(ua_chan->obj); | |
55cc08a6 | 2444 | |
7972aab2 | 2445 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2446 | |
7972aab2 DG |
2447 | /* Setup all streams for the registry. */ |
2448 | ret = setup_buffer_reg_streams(reg_chan, ua_chan); | |
2449 | if (ret < 0) { | |
55cc08a6 DG |
2450 | goto error; |
2451 | } | |
2452 | ||
7972aab2 DG |
2453 | reg_chan->obj.ust = ua_chan->obj; |
2454 | ua_chan->obj = NULL; | |
55cc08a6 | 2455 | |
7972aab2 | 2456 | return 0; |
55cc08a6 DG |
2457 | |
2458 | error: | |
7972aab2 DG |
2459 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2460 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2461 | return ret; |
2462 | } | |
2463 | ||
edb67388 | 2464 | /* |
7972aab2 | 2465 | * Send buffer registry channel to the application. |
d0b96690 | 2466 | * |
7972aab2 | 2467 | * Return 0 on success else a negative value. |
edb67388 | 2468 | */ |
7972aab2 DG |
2469 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2470 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2471 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2472 | { |
2473 | int ret; | |
7972aab2 | 2474 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2475 | |
7972aab2 DG |
2476 | assert(reg_chan); |
2477 | assert(app); | |
2478 | assert(ua_sess); | |
2479 | assert(ua_chan); | |
2480 | ||
2481 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2482 | ||
2483 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2484 | if (ret < 0) { |
2485 | goto error; | |
2486 | } | |
2487 | ||
7972aab2 DG |
2488 | /* Send channel to the application. */ |
2489 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
31cb5470 MD |
2490 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
2491 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
2492 | goto error; | |
2493 | } else if (ret < 0) { | |
7972aab2 DG |
2494 | goto error; |
2495 | } | |
2496 | ||
2497 | health_code_update(); | |
2498 | ||
2499 | /* Send all streams to application. */ | |
2500 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2501 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2502 | struct ust_app_stream stream; | |
2503 | ||
2504 | ret = duplicate_stream_object(reg_stream, &stream); | |
2505 | if (ret < 0) { | |
2506 | goto error_stream_unlock; | |
2507 | } | |
2508 | ||
2509 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2510 | if (ret < 0) { | |
8c067051 | 2511 | (void) release_ust_app_stream(-1, &stream); |
31cb5470 MD |
2512 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
2513 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
2514 | goto error_stream_unlock; | |
2515 | } else if (ret < 0) { | |
2516 | goto error_stream_unlock; | |
2517 | } | |
7972aab2 DG |
2518 | goto error_stream_unlock; |
2519 | } | |
edb67388 | 2520 | |
7972aab2 DG |
2521 | /* |
2522 | * The return value is not important here. This function will output an | |
2523 | * error if needed. | |
2524 | */ | |
2525 | (void) release_ust_app_stream(-1, &stream); | |
2526 | } | |
2527 | ua_chan->is_sent = 1; | |
2528 | ||
2529 | error_stream_unlock: | |
2530 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2531 | error: |
2532 | return ret; | |
2533 | } | |
2534 | ||
9730260e | 2535 | /* |
7972aab2 DG |
2536 | * Create and send to the application the created buffers with per UID buffers. |
2537 | * | |
2538 | * Return 0 on success else a negative value. | |
9730260e | 2539 | */ |
7972aab2 DG |
2540 | static int create_channel_per_uid(struct ust_app *app, |
2541 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2542 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2543 | { |
2544 | int ret; | |
7972aab2 DG |
2545 | struct buffer_reg_uid *reg_uid; |
2546 | struct buffer_reg_channel *reg_chan; | |
9730260e | 2547 | |
7972aab2 DG |
2548 | assert(app); |
2549 | assert(usess); | |
2550 | assert(ua_sess); | |
2551 | assert(ua_chan); | |
2552 | ||
2553 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2554 | ||
2555 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2556 | /* | |
2557 | * The session creation handles the creation of this global registry | |
2558 | * object. If none can be find, there is a code flow problem or a | |
2559 | * teardown race. | |
2560 | */ | |
2561 | assert(reg_uid); | |
2562 | ||
2563 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2564 | reg_uid); | |
2565 | if (!reg_chan) { | |
2566 | /* Create the buffer registry channel object. */ | |
2567 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2568 | if (ret < 0) { | |
f14256d6 MD |
2569 | ERR("Error creating the UST channel \"%s\" registry instance", |
2570 | ua_chan->name); | |
7972aab2 DG |
2571 | goto error; |
2572 | } | |
2573 | assert(reg_chan); | |
2574 | ||
2575 | /* | |
2576 | * Create the buffers on the consumer side. This call populates the | |
2577 | * ust app channel object with all streams and data object. | |
2578 | */ | |
2579 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2580 | app->bits_per_long, reg_uid->registry->reg.ust); | |
2581 | if (ret < 0) { | |
f14256d6 MD |
2582 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
2583 | ua_chan->name); | |
2584 | ||
07d2ae95 DG |
2585 | /* |
2586 | * Let's remove the previously created buffer registry channel so | |
2587 | * it's not visible anymore in the session registry. | |
2588 | */ | |
2589 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, | |
2590 | ua_chan->tracing_channel_id); | |
2591 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
2592 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
7972aab2 DG |
2593 | goto error; |
2594 | } | |
2595 | ||
2596 | /* | |
2597 | * Setup the streams and add it to the session registry. | |
2598 | */ | |
2599 | ret = setup_buffer_reg_channel(reg_uid->registry, ua_chan, reg_chan); | |
2600 | if (ret < 0) { | |
f14256d6 MD |
2601 | ERR("Error setting up UST channel \"%s\"", |
2602 | ua_chan->name); | |
7972aab2 DG |
2603 | goto error; |
2604 | } | |
2605 | ||
2606 | } | |
2607 | ||
2608 | /* Send buffers to the application. */ | |
2609 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
9730260e | 2610 | if (ret < 0) { |
31cb5470 MD |
2611 | if (ret != -ENOTCONN) { |
2612 | ERR("Error sending channel to application"); | |
2613 | } | |
9730260e DG |
2614 | goto error; |
2615 | } | |
2616 | ||
9730260e DG |
2617 | error: |
2618 | return ret; | |
2619 | } | |
2620 | ||
78f0bacd | 2621 | /* |
7972aab2 DG |
2622 | * Create and send to the application the created buffers with per PID buffers. |
2623 | * | |
2624 | * Return 0 on success else a negative value. | |
78f0bacd | 2625 | */ |
7972aab2 DG |
2626 | static int create_channel_per_pid(struct ust_app *app, |
2627 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2628 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2629 | { |
8535a6d9 | 2630 | int ret; |
7972aab2 | 2631 | struct ust_registry_session *registry; |
78f0bacd | 2632 | |
7972aab2 DG |
2633 | assert(app); |
2634 | assert(usess); | |
2635 | assert(ua_sess); | |
2636 | assert(ua_chan); | |
2637 | ||
2638 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2639 | ||
2640 | rcu_read_lock(); | |
2641 | ||
2642 | registry = get_session_registry(ua_sess); | |
2643 | assert(registry); | |
2644 | ||
2645 | /* Create and add a new channel registry to session. */ | |
2646 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd | 2647 | if (ret < 0) { |
f14256d6 MD |
2648 | ERR("Error creating the UST channel \"%s\" registry instance", |
2649 | ua_chan->name); | |
78f0bacd DG |
2650 | goto error; |
2651 | } | |
2652 | ||
7972aab2 DG |
2653 | /* Create and get channel on the consumer side. */ |
2654 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2655 | app->bits_per_long, registry); | |
2656 | if (ret < 0) { | |
f14256d6 MD |
2657 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
2658 | ua_chan->name); | |
7972aab2 DG |
2659 | goto error; |
2660 | } | |
2661 | ||
2662 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
2663 | if (ret < 0) { | |
31cb5470 MD |
2664 | if (ret != -ENOTCONN) { |
2665 | ERR("Error sending channel to application"); | |
2666 | } | |
7972aab2 DG |
2667 | goto error; |
2668 | } | |
8535a6d9 | 2669 | |
78f0bacd | 2670 | error: |
7972aab2 | 2671 | rcu_read_unlock(); |
78f0bacd DG |
2672 | return ret; |
2673 | } | |
2674 | ||
2675 | /* | |
7972aab2 DG |
2676 | * From an already allocated ust app channel, create the channel buffers if |
2677 | * need and send it to the application. This MUST be called with a RCU read | |
2678 | * side lock acquired. | |
2679 | * | |
31cb5470 MD |
2680 | * Return 0 on success or else a negative value. Returns -ENOTCONN if |
2681 | * the application exited concurrently. | |
78f0bacd | 2682 | */ |
7972aab2 DG |
2683 | static int do_create_channel(struct ust_app *app, |
2684 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2685 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2686 | { |
7972aab2 | 2687 | int ret; |
78f0bacd | 2688 | |
7972aab2 DG |
2689 | assert(app); |
2690 | assert(usess); | |
2691 | assert(ua_sess); | |
2692 | assert(ua_chan); | |
2693 | ||
2694 | /* Handle buffer type before sending the channel to the application. */ | |
2695 | switch (usess->buffer_type) { | |
2696 | case LTTNG_BUFFER_PER_UID: | |
2697 | { | |
2698 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
2699 | if (ret < 0) { | |
2700 | goto error; | |
2701 | } | |
2702 | break; | |
2703 | } | |
2704 | case LTTNG_BUFFER_PER_PID: | |
2705 | { | |
2706 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
2707 | if (ret < 0) { | |
2708 | goto error; | |
2709 | } | |
2710 | break; | |
2711 | } | |
2712 | default: | |
2713 | assert(0); | |
2714 | ret = -EINVAL; | |
78f0bacd DG |
2715 | goto error; |
2716 | } | |
2717 | ||
7972aab2 DG |
2718 | /* Initialize ust objd object using the received handle and add it. */ |
2719 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
2720 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 2721 | |
7972aab2 DG |
2722 | /* If channel is not enabled, disable it on the tracer */ |
2723 | if (!ua_chan->enabled) { | |
2724 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2725 | if (ret < 0) { | |
2726 | goto error; | |
2727 | } | |
78f0bacd DG |
2728 | } |
2729 | ||
2730 | error: | |
2731 | return ret; | |
2732 | } | |
2733 | ||
284d8f55 | 2734 | /* |
4d710ac2 DG |
2735 | * Create UST app channel and create it on the tracer. Set ua_chanp of the |
2736 | * newly created channel if not NULL. | |
d0b96690 | 2737 | * |
36b588ed | 2738 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 | 2739 | * |
31cb5470 MD |
2740 | * Return 0 on success or else a negative value. Returns -ENOTCONN if |
2741 | * the application exited concurrently. | |
284d8f55 | 2742 | */ |
4d710ac2 DG |
2743 | static int create_ust_app_channel(struct ust_app_session *ua_sess, |
2744 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
7972aab2 | 2745 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 2746 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
2747 | { |
2748 | int ret = 0; | |
bec39940 DG |
2749 | struct lttng_ht_iter iter; |
2750 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
2751 | struct ust_app_channel *ua_chan; |
2752 | ||
2753 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
2754 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
2755 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 2756 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 2757 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 2758 | goto end; |
5b4a0ec0 DG |
2759 | } |
2760 | ||
d0b96690 | 2761 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
2762 | if (ua_chan == NULL) { |
2763 | /* Only malloc can fail here */ | |
4d710ac2 | 2764 | ret = -ENOMEM; |
094d1690 | 2765 | goto error_alloc; |
fc34caaa DG |
2766 | } |
2767 | shadow_copy_channel(ua_chan, uchan); | |
2768 | ||
ffe60014 DG |
2769 | /* Set channel type. */ |
2770 | ua_chan->attr.type = type; | |
2771 | ||
7972aab2 | 2772 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
5b4a0ec0 DG |
2773 | if (ret < 0) { |
2774 | goto error; | |
2775 | } | |
2776 | ||
fc34caaa | 2777 | DBG2("UST app create channel %s for PID %d completed", ua_chan->name, |
852d0037 | 2778 | app->pid); |
fc34caaa | 2779 | |
d0b96690 DG |
2780 | /* Only add the channel if successful on the tracer side. */ |
2781 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
2782 | ||
fc34caaa | 2783 | end: |
4d710ac2 DG |
2784 | if (ua_chanp) { |
2785 | *ua_chanp = ua_chan; | |
2786 | } | |
2787 | ||
2788 | /* Everything went well. */ | |
2789 | return 0; | |
5b4a0ec0 DG |
2790 | |
2791 | error: | |
d0b96690 | 2792 | delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app); |
094d1690 | 2793 | error_alloc: |
4d710ac2 | 2794 | return ret; |
5b4a0ec0 DG |
2795 | } |
2796 | ||
2797 | /* | |
2798 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
2799 | * |
2800 | * Called with ust app session mutex held. | |
5b4a0ec0 | 2801 | */ |
edb67388 DG |
2802 | static |
2803 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
2804 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
2805 | struct ust_app *app) | |
284d8f55 | 2806 | { |
edb67388 | 2807 | int ret = 0; |
5b4a0ec0 | 2808 | struct ust_app_event *ua_event; |
284d8f55 | 2809 | |
5b4a0ec0 | 2810 | /* Get event node */ |
18eace3b | 2811 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 2812 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 2813 | if (ua_event != NULL) { |
fc34caaa | 2814 | ret = -EEXIST; |
edb67388 DG |
2815 | goto end; |
2816 | } | |
5b4a0ec0 | 2817 | |
edb67388 DG |
2818 | /* Does not exist so create one */ |
2819 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); | |
2820 | if (ua_event == NULL) { | |
2821 | /* Only malloc can failed so something is really wrong */ | |
2822 | ret = -ENOMEM; | |
fc34caaa | 2823 | goto end; |
5b4a0ec0 | 2824 | } |
edb67388 | 2825 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 2826 | |
edb67388 | 2827 | /* Create it on the tracer side */ |
5b4a0ec0 | 2828 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 2829 | if (ret < 0) { |
fc34caaa | 2830 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 2831 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
2832 | goto error; |
2833 | } | |
2834 | ||
d0b96690 | 2835 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 2836 | |
fc34caaa | 2837 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 2838 | app->pid); |
7f79d3a1 | 2839 | |
edb67388 | 2840 | end: |
fc34caaa DG |
2841 | return ret; |
2842 | ||
5b4a0ec0 | 2843 | error: |
fc34caaa DG |
2844 | /* Valid. Calling here is already in a read side lock */ |
2845 | delete_ust_app_event(-1, ua_event); | |
edb67388 | 2846 | return ret; |
5b4a0ec0 DG |
2847 | } |
2848 | ||
2849 | /* | |
2850 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 2851 | * |
7972aab2 | 2852 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
2853 | */ |
2854 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
ad7a9107 | 2855 | struct ust_app *app, struct consumer_output *consumer) |
5b4a0ec0 DG |
2856 | { |
2857 | int ret = 0; | |
ffe60014 | 2858 | struct ust_app_channel *metadata; |
d88aee68 | 2859 | struct consumer_socket *socket; |
7972aab2 | 2860 | struct ust_registry_session *registry; |
5b4a0ec0 | 2861 | |
ffe60014 DG |
2862 | assert(ua_sess); |
2863 | assert(app); | |
d88aee68 | 2864 | assert(consumer); |
5b4a0ec0 | 2865 | |
7972aab2 DG |
2866 | registry = get_session_registry(ua_sess); |
2867 | assert(registry); | |
2868 | ||
e3ae3c71 MD |
2869 | pthread_mutex_lock(®istry->lock); |
2870 | ||
1b532a60 DG |
2871 | /* Metadata already exists for this registry or it was closed previously */ |
2872 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
2873 | ret = 0; |
2874 | goto error; | |
5b4a0ec0 DG |
2875 | } |
2876 | ||
ffe60014 | 2877 | /* Allocate UST metadata */ |
d0b96690 | 2878 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
2879 | if (!metadata) { |
2880 | /* malloc() failed */ | |
2881 | ret = -ENOMEM; | |
2882 | goto error; | |
2883 | } | |
5b4a0ec0 | 2884 | |
ad7a9107 | 2885 | memcpy(&metadata->attr, &ua_sess->metadata_attr, sizeof(metadata->attr)); |
5b4a0ec0 | 2886 | |
7972aab2 DG |
2887 | /* Need one fd for the channel. */ |
2888 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2889 | if (ret < 0) { | |
2890 | ERR("Exhausted number of available FD upon create metadata"); | |
2891 | goto error; | |
2892 | } | |
2893 | ||
4dc3dfc5 DG |
2894 | /* Get the right consumer socket for the application. */ |
2895 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
2896 | if (!socket) { | |
2897 | ret = -EINVAL; | |
2898 | goto error_consumer; | |
2899 | } | |
2900 | ||
331744e3 JD |
2901 | /* |
2902 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
2903 | * to the registry *before* we ask the consumer so we avoid the race of the | |
2904 | * consumer requesting the metadata and the ask_channel call on our side | |
2905 | * did not returned yet. | |
2906 | */ | |
2907 | registry->metadata_key = metadata->key; | |
2908 | ||
d88aee68 DG |
2909 | /* |
2910 | * Ask the metadata channel creation to the consumer. The metadata object | |
2911 | * will be created by the consumer and kept their. However, the stream is | |
2912 | * never added or monitored until we do a first push metadata to the | |
2913 | * consumer. | |
2914 | */ | |
7972aab2 DG |
2915 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
2916 | registry); | |
d88aee68 | 2917 | if (ret < 0) { |
f2a444f1 DG |
2918 | /* Nullify the metadata key so we don't try to close it later on. */ |
2919 | registry->metadata_key = 0; | |
d88aee68 DG |
2920 | goto error_consumer; |
2921 | } | |
2922 | ||
2923 | /* | |
2924 | * The setup command will make the metadata stream be sent to the relayd, | |
2925 | * if applicable, and the thread managing the metadatas. This is important | |
2926 | * because after this point, if an error occurs, the only way the stream | |
2927 | * can be deleted is to be monitored in the consumer. | |
2928 | */ | |
7972aab2 | 2929 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 2930 | if (ret < 0) { |
f2a444f1 DG |
2931 | /* Nullify the metadata key so we don't try to close it later on. */ |
2932 | registry->metadata_key = 0; | |
d88aee68 | 2933 | goto error_consumer; |
5b4a0ec0 DG |
2934 | } |
2935 | ||
7972aab2 DG |
2936 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
2937 | metadata->key, app->pid); | |
5b4a0ec0 | 2938 | |
d88aee68 | 2939 | error_consumer: |
b80f0b6c | 2940 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 2941 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 2942 | error: |
e3ae3c71 | 2943 | pthread_mutex_unlock(®istry->lock); |
ffe60014 | 2944 | return ret; |
5b4a0ec0 DG |
2945 | } |
2946 | ||
5b4a0ec0 | 2947 | /* |
d88aee68 DG |
2948 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
2949 | * acquired before calling this function. | |
5b4a0ec0 DG |
2950 | */ |
2951 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
2952 | { | |
d88aee68 | 2953 | struct ust_app *app = NULL; |
bec39940 DG |
2954 | struct lttng_ht_node_ulong *node; |
2955 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 2956 | |
bec39940 DG |
2957 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
2958 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
2959 | if (node == NULL) { |
2960 | DBG2("UST app no found with pid %d", pid); | |
2961 | goto error; | |
2962 | } | |
5b4a0ec0 DG |
2963 | |
2964 | DBG2("Found UST app by pid %d", pid); | |
2965 | ||
d88aee68 | 2966 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
2967 | |
2968 | error: | |
d88aee68 | 2969 | return app; |
5b4a0ec0 DG |
2970 | } |
2971 | ||
d88aee68 DG |
2972 | /* |
2973 | * Allocate and init an UST app object using the registration information and | |
2974 | * the command socket. This is called when the command socket connects to the | |
2975 | * session daemon. | |
2976 | * | |
2977 | * The object is returned on success or else NULL. | |
2978 | */ | |
d0b96690 | 2979 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 2980 | { |
d0b96690 DG |
2981 | struct ust_app *lta = NULL; |
2982 | ||
2983 | assert(msg); | |
2984 | assert(sock >= 0); | |
2985 | ||
2986 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 2987 | |
173af62f DG |
2988 | if ((msg->bits_per_long == 64 && |
2989 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
2990 | || (msg->bits_per_long == 32 && | |
2991 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 2992 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
2993 | "%d-bit long, but no consumerd for this size is available.\n", |
2994 | msg->name, msg->pid, msg->bits_per_long); | |
2995 | goto error; | |
3f2c5fcc | 2996 | } |
d0b96690 | 2997 | |
5b4a0ec0 DG |
2998 | lta = zmalloc(sizeof(struct ust_app)); |
2999 | if (lta == NULL) { | |
3000 | PERROR("malloc"); | |
d0b96690 | 3001 | goto error; |
5b4a0ec0 DG |
3002 | } |
3003 | ||
3004 | lta->ppid = msg->ppid; | |
3005 | lta->uid = msg->uid; | |
3006 | lta->gid = msg->gid; | |
d0b96690 | 3007 | |
7753dea8 | 3008 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
3009 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
3010 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
3011 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
3012 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
3013 | lta->long_alignment = msg->long_alignment; | |
3014 | lta->byte_order = msg->byte_order; | |
3015 | ||
5b4a0ec0 DG |
3016 | lta->v_major = msg->major; |
3017 | lta->v_minor = msg->minor; | |
d9bf3ca4 | 3018 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 DG |
3019 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
3020 | lta->notify_sock = -1; | |
d88aee68 DG |
3021 | |
3022 | /* Copy name and make sure it's NULL terminated. */ | |
3023 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
3024 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
3025 | ||
3026 | /* | |
3027 | * Before this can be called, when receiving the registration information, | |
3028 | * the application compatibility is checked. So, at this point, the | |
3029 | * application can work with this session daemon. | |
3030 | */ | |
d0b96690 | 3031 | lta->compatible = 1; |
5b4a0ec0 | 3032 | |
852d0037 | 3033 | lta->pid = msg->pid; |
d0b96690 | 3034 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 3035 | lta->sock = sock; |
d0b96690 | 3036 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 3037 | |
d42f20df DG |
3038 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
3039 | ||
d0b96690 DG |
3040 | error: |
3041 | return lta; | |
3042 | } | |
3043 | ||
d88aee68 DG |
3044 | /* |
3045 | * For a given application object, add it to every hash table. | |
3046 | */ | |
d0b96690 DG |
3047 | void ust_app_add(struct ust_app *app) |
3048 | { | |
3049 | assert(app); | |
3050 | assert(app->notify_sock >= 0); | |
3051 | ||
5b4a0ec0 | 3052 | rcu_read_lock(); |
852d0037 DG |
3053 | |
3054 | /* | |
3055 | * On a re-registration, we want to kick out the previous registration of | |
3056 | * that pid | |
3057 | */ | |
d0b96690 | 3058 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
3059 | |
3060 | /* | |
3061 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
3062 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
3063 | * already in the table. | |
3064 | */ | |
d0b96690 | 3065 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 3066 | |
d0b96690 DG |
3067 | /* Add application to the notify socket hash table. */ |
3068 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
3069 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 3070 | |
d0b96690 | 3071 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
3072 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
3073 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
3074 | app->v_minor); | |
5b4a0ec0 | 3075 | |
d0b96690 DG |
3076 | rcu_read_unlock(); |
3077 | } | |
3078 | ||
d88aee68 DG |
3079 | /* |
3080 | * Set the application version into the object. | |
3081 | * | |
3082 | * Return 0 on success else a negative value either an errno code or a | |
3083 | * LTTng-UST error code. | |
3084 | */ | |
d0b96690 DG |
3085 | int ust_app_version(struct ust_app *app) |
3086 | { | |
d88aee68 DG |
3087 | int ret; |
3088 | ||
d0b96690 | 3089 | assert(app); |
d88aee68 DG |
3090 | |
3091 | ret = ustctl_tracer_version(app->sock, &app->version); | |
3092 | if (ret < 0) { | |
3093 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
5368d366 | 3094 | ERR("UST app %d version failed with ret %d", app->sock, ret); |
d88aee68 | 3095 | } else { |
5368d366 | 3096 | DBG3("UST app %d version failed. Application is dead", app->sock); |
d88aee68 DG |
3097 | } |
3098 | } | |
3099 | ||
3100 | return ret; | |
5b4a0ec0 DG |
3101 | } |
3102 | ||
3103 | /* | |
3104 | * Unregister app by removing it from the global traceable app list and freeing | |
3105 | * the data struct. | |
3106 | * | |
3107 | * The socket is already closed at this point so no close to sock. | |
3108 | */ | |
3109 | void ust_app_unregister(int sock) | |
3110 | { | |
3111 | struct ust_app *lta; | |
bec39940 | 3112 | struct lttng_ht_node_ulong *node; |
99090057 | 3113 | struct lttng_ht_iter ust_app_sock_iter; |
bec39940 | 3114 | struct lttng_ht_iter iter; |
d42f20df | 3115 | struct ust_app_session *ua_sess; |
525b0740 | 3116 | int ret; |
5b4a0ec0 DG |
3117 | |
3118 | rcu_read_lock(); | |
886459c6 | 3119 | |
5b4a0ec0 | 3120 | /* Get the node reference for a call_rcu */ |
99090057 MD |
3121 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &ust_app_sock_iter); |
3122 | node = lttng_ht_iter_get_node_ulong(&ust_app_sock_iter); | |
d0b96690 | 3123 | assert(node); |
284d8f55 | 3124 | |
852d0037 | 3125 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
3126 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
3127 | ||
d88aee68 | 3128 | /* |
e3ae3c71 MD |
3129 | * For per-PID buffers, perform "push metadata" and flush all |
3130 | * application streams before removing app from hash tables, | |
3131 | * ensuring proper behavior of data_pending check. | |
99090057 | 3132 | * Remove sessions so they are not visible during deletion. |
d88aee68 | 3133 | */ |
d42f20df DG |
3134 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, |
3135 | node.node) { | |
7972aab2 DG |
3136 | struct ust_registry_session *registry; |
3137 | ||
d42f20df DG |
3138 | ret = lttng_ht_del(lta->sessions, &iter); |
3139 | if (ret) { | |
3140 | /* The session was already removed so scheduled for teardown. */ | |
3141 | continue; | |
3142 | } | |
3143 | ||
e3ae3c71 MD |
3144 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { |
3145 | (void) ust_app_flush_app_session(lta, ua_sess); | |
3146 | } | |
99090057 | 3147 | |
d42f20df DG |
3148 | /* |
3149 | * Add session to list for teardown. This is safe since at this point we | |
3150 | * are the only one using this list. | |
3151 | */ | |
d88aee68 DG |
3152 | pthread_mutex_lock(&ua_sess->lock); |
3153 | ||
d4769e14 MD |
3154 | if (ua_sess->deleted) { |
3155 | pthread_mutex_unlock(&ua_sess->lock); | |
3156 | continue; | |
3157 | } | |
3158 | ||
d88aee68 DG |
3159 | /* |
3160 | * Normally, this is done in the delete session process which is | |
3161 | * executed in the call rcu below. However, upon registration we can't | |
3162 | * afford to wait for the grace period before pushing data or else the | |
3163 | * data pending feature can race between the unregistration and stop | |
3164 | * command where the data pending command is sent *before* the grace | |
3165 | * period ended. | |
3166 | * | |
3167 | * The close metadata below nullifies the metadata pointer in the | |
3168 | * session so the delete session will NOT push/close a second time. | |
3169 | */ | |
7972aab2 | 3170 | registry = get_session_registry(ua_sess); |
e3ae3c71 | 3171 | if (registry) { |
7972aab2 DG |
3172 | /* Push metadata for application before freeing the application. */ |
3173 | (void) push_metadata(registry, ua_sess->consumer); | |
3174 | ||
3175 | /* | |
3176 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
3177 | * metadata only on destroy trace session in this case. Also, the |
3178 | * previous push metadata could have flag the metadata registry to | |
3179 | * close so don't send a close command if closed. | |
7972aab2 | 3180 | */ |
e3ae3c71 | 3181 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
3182 | /* And ask to close it for this session registry. */ |
3183 | (void) close_metadata(registry, ua_sess->consumer); | |
3184 | } | |
3185 | } | |
d42f20df | 3186 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
99090057 | 3187 | |
d88aee68 | 3188 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
3189 | } |
3190 | ||
99090057 MD |
3191 | /* Remove application from PID hash table */ |
3192 | ret = lttng_ht_del(ust_app_ht_by_sock, &ust_app_sock_iter); | |
3193 | assert(!ret); | |
3194 | ||
3195 | /* | |
3196 | * Remove application from notify hash table. The thread handling the | |
3197 | * notify socket could have deleted the node so ignore on error because | |
3198 | * either way it's valid. The close of that socket is handled by the other | |
3199 | * thread. | |
3200 | */ | |
3201 | iter.iter.node = <a->notify_sock_n.node; | |
3202 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3203 | ||
3204 | /* | |
3205 | * Ignore return value since the node might have been removed before by an | |
3206 | * add replace during app registration because the PID can be reassigned by | |
3207 | * the OS. | |
3208 | */ | |
3209 | iter.iter.node = <a->pid_n.node; | |
3210 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3211 | if (ret) { | |
3212 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
3213 | lta->pid); | |
3214 | } | |
3215 | ||
852d0037 DG |
3216 | /* Free memory */ |
3217 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
3218 | ||
5b4a0ec0 DG |
3219 | rcu_read_unlock(); |
3220 | return; | |
284d8f55 DG |
3221 | } |
3222 | ||
5b4a0ec0 DG |
3223 | /* |
3224 | * Fill events array with all events name of all registered apps. | |
3225 | */ | |
3226 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 3227 | { |
5b4a0ec0 DG |
3228 | int ret, handle; |
3229 | size_t nbmem, count = 0; | |
bec39940 | 3230 | struct lttng_ht_iter iter; |
5b4a0ec0 | 3231 | struct ust_app *app; |
c617c0c6 | 3232 | struct lttng_event *tmp_event; |
421cb601 | 3233 | |
5b4a0ec0 | 3234 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
3235 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
3236 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
3237 | PERROR("zmalloc ust app events"); |
3238 | ret = -ENOMEM; | |
421cb601 DG |
3239 | goto error; |
3240 | } | |
3241 | ||
5b4a0ec0 | 3242 | rcu_read_lock(); |
421cb601 | 3243 | |
852d0037 | 3244 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 3245 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 3246 | |
840cb59c | 3247 | health_code_update(); |
86acf0da | 3248 | |
e0c7ec2b DG |
3249 | if (!app->compatible) { |
3250 | /* | |
3251 | * TODO: In time, we should notice the caller of this error by | |
3252 | * telling him that this is a version error. | |
3253 | */ | |
3254 | continue; | |
3255 | } | |
852d0037 | 3256 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 3257 | if (handle < 0) { |
ffe60014 DG |
3258 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3259 | ERR("UST app list events getting handle failed for app pid %d", | |
3260 | app->pid); | |
3261 | } | |
5b4a0ec0 DG |
3262 | continue; |
3263 | } | |
421cb601 | 3264 | |
852d0037 | 3265 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 3266 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3267 | /* Handle ustctl error. */ |
3268 | if (ret < 0) { | |
a2ba1ab0 | 3269 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3270 | ERR("UST app tp list get failed for app %d with ret %d", |
3271 | app->sock, ret); | |
3272 | } else { | |
3273 | DBG3("UST app tp list get failed. Application is dead"); | |
3757b385 DG |
3274 | /* |
3275 | * This is normal behavior, an application can die during the | |
3276 | * creation process. Don't report an error so the execution can | |
3277 | * continue normally. Continue normal execution. | |
3278 | */ | |
3279 | break; | |
ffe60014 | 3280 | } |
98f595d4 | 3281 | free(tmp_event); |
ffe60014 DG |
3282 | goto rcu_error; |
3283 | } | |
3284 | ||
840cb59c | 3285 | health_code_update(); |
815564d8 | 3286 | if (count >= nbmem) { |
d7b3776f | 3287 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3288 | struct lttng_event *new_tmp_event; |
3289 | size_t new_nbmem; | |
3290 | ||
3291 | new_nbmem = nbmem << 1; | |
3292 | DBG2("Reallocating event list from %zu to %zu entries", | |
3293 | nbmem, new_nbmem); | |
3294 | new_tmp_event = realloc(tmp_event, | |
3295 | new_nbmem * sizeof(struct lttng_event)); | |
3296 | if (new_tmp_event == NULL) { | |
5b4a0ec0 | 3297 | PERROR("realloc ust app events"); |
c617c0c6 | 3298 | free(tmp_event); |
5b4a0ec0 DG |
3299 | ret = -ENOMEM; |
3300 | goto rcu_error; | |
3301 | } | |
53efb85a MD |
3302 | /* Zero the new memory */ |
3303 | memset(new_tmp_event + nbmem, 0, | |
3304 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
3305 | nbmem = new_nbmem; | |
3306 | tmp_event = new_tmp_event; | |
5b4a0ec0 | 3307 | } |
c617c0c6 MD |
3308 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
3309 | tmp_event[count].loglevel = uiter.loglevel; | |
3310 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
3311 | tmp_event[count].pid = app->pid; | |
3312 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 3313 | count++; |
421cb601 | 3314 | } |
421cb601 DG |
3315 | } |
3316 | ||
5b4a0ec0 | 3317 | ret = count; |
c617c0c6 | 3318 | *events = tmp_event; |
421cb601 | 3319 | |
5b4a0ec0 | 3320 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 3321 | |
5b4a0ec0 DG |
3322 | rcu_error: |
3323 | rcu_read_unlock(); | |
421cb601 | 3324 | error: |
840cb59c | 3325 | health_code_update(); |
5b4a0ec0 | 3326 | return ret; |
421cb601 DG |
3327 | } |
3328 | ||
f37d259d MD |
3329 | /* |
3330 | * Fill events array with all events name of all registered apps. | |
3331 | */ | |
3332 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
3333 | { | |
3334 | int ret, handle; | |
3335 | size_t nbmem, count = 0; | |
3336 | struct lttng_ht_iter iter; | |
3337 | struct ust_app *app; | |
c617c0c6 | 3338 | struct lttng_event_field *tmp_event; |
f37d259d MD |
3339 | |
3340 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
3341 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
3342 | if (tmp_event == NULL) { | |
f37d259d MD |
3343 | PERROR("zmalloc ust app event fields"); |
3344 | ret = -ENOMEM; | |
3345 | goto error; | |
3346 | } | |
3347 | ||
3348 | rcu_read_lock(); | |
3349 | ||
3350 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3351 | struct lttng_ust_field_iter uiter; | |
3352 | ||
840cb59c | 3353 | health_code_update(); |
86acf0da | 3354 | |
f37d259d MD |
3355 | if (!app->compatible) { |
3356 | /* | |
3357 | * TODO: In time, we should notice the caller of this error by | |
3358 | * telling him that this is a version error. | |
3359 | */ | |
3360 | continue; | |
3361 | } | |
3362 | handle = ustctl_tracepoint_field_list(app->sock); | |
3363 | if (handle < 0) { | |
ffe60014 DG |
3364 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3365 | ERR("UST app list field getting handle failed for app pid %d", | |
3366 | app->pid); | |
3367 | } | |
f37d259d MD |
3368 | continue; |
3369 | } | |
3370 | ||
3371 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 3372 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3373 | /* Handle ustctl error. */ |
3374 | if (ret < 0) { | |
a2ba1ab0 | 3375 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3376 | ERR("UST app tp list field failed for app %d with ret %d", |
3377 | app->sock, ret); | |
3378 | } else { | |
3379 | DBG3("UST app tp list field failed. Application is dead"); | |
3757b385 DG |
3380 | /* |
3381 | * This is normal behavior, an application can die during the | |
3382 | * creation process. Don't report an error so the execution can | |
98f595d4 | 3383 | * continue normally. Reset list and count for next app. |
3757b385 DG |
3384 | */ |
3385 | break; | |
ffe60014 | 3386 | } |
98f595d4 | 3387 | free(tmp_event); |
ffe60014 DG |
3388 | goto rcu_error; |
3389 | } | |
3390 | ||
840cb59c | 3391 | health_code_update(); |
f37d259d | 3392 | if (count >= nbmem) { |
d7b3776f | 3393 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3394 | struct lttng_event_field *new_tmp_event; |
3395 | size_t new_nbmem; | |
3396 | ||
3397 | new_nbmem = nbmem << 1; | |
3398 | DBG2("Reallocating event field list from %zu to %zu entries", | |
3399 | nbmem, new_nbmem); | |
3400 | new_tmp_event = realloc(tmp_event, | |
3401 | new_nbmem * sizeof(struct lttng_event_field)); | |
3402 | if (new_tmp_event == NULL) { | |
f37d259d | 3403 | PERROR("realloc ust app event fields"); |
c617c0c6 | 3404 | free(tmp_event); |
f37d259d MD |
3405 | ret = -ENOMEM; |
3406 | goto rcu_error; | |
3407 | } | |
53efb85a MD |
3408 | /* Zero the new memory */ |
3409 | memset(new_tmp_event + nbmem, 0, | |
3410 | (new_nbmem - nbmem) * sizeof(struct lttng_event_field)); | |
3411 | nbmem = new_nbmem; | |
3412 | tmp_event = new_tmp_event; | |
f37d259d | 3413 | } |
f37d259d | 3414 | |
c617c0c6 | 3415 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
2e84128e DG |
3416 | /* Mapping between these enums matches 1 to 1. */ |
3417 | tmp_event[count].type = (enum lttng_event_field_type) uiter.type; | |
c617c0c6 | 3418 | tmp_event[count].nowrite = uiter.nowrite; |
f37d259d | 3419 | |
c617c0c6 MD |
3420 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
3421 | tmp_event[count].event.loglevel = uiter.loglevel; | |
2e84128e | 3422 | tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; |
c617c0c6 MD |
3423 | tmp_event[count].event.pid = app->pid; |
3424 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
3425 | count++; |
3426 | } | |
3427 | } | |
3428 | ||
3429 | ret = count; | |
c617c0c6 | 3430 | *fields = tmp_event; |
f37d259d MD |
3431 | |
3432 | DBG2("UST app list event fields done (%zu events)", count); | |
3433 | ||
3434 | rcu_error: | |
3435 | rcu_read_unlock(); | |
3436 | error: | |
840cb59c | 3437 | health_code_update(); |
f37d259d MD |
3438 | return ret; |
3439 | } | |
3440 | ||
5b4a0ec0 DG |
3441 | /* |
3442 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
3443 | * |
3444 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
3445 | */ |
3446 | void ust_app_clean_list(void) | |
421cb601 | 3447 | { |
5b4a0ec0 | 3448 | int ret; |
659ed79f | 3449 | struct ust_app *app; |
bec39940 | 3450 | struct lttng_ht_iter iter; |
421cb601 | 3451 | |
5b4a0ec0 | 3452 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3453 | |
5b4a0ec0 | 3454 | rcu_read_lock(); |
421cb601 | 3455 | |
659ed79f | 3456 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3457 | ret = lttng_ht_del(ust_app_ht, &iter); |
525b0740 | 3458 | assert(!ret); |
659ed79f | 3459 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); |
421cb601 DG |
3460 | } |
3461 | ||
852d0037 | 3462 | /* Cleanup socket hash table */ |
659ed79f DG |
3463 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, |
3464 | sock_n.node) { | |
852d0037 | 3465 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
bec39940 DG |
3466 | assert(!ret); |
3467 | } | |
852d0037 | 3468 | |
d88aee68 DG |
3469 | /* Cleanup notify socket hash table */ |
3470 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3471 | notify_sock_n.node) { | |
3472 | ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3473 | assert(!ret); | |
3474 | } | |
36b588ed | 3475 | rcu_read_unlock(); |
d88aee68 | 3476 | |
bec39940 | 3477 | /* Destroy is done only when the ht is empty */ |
0b2dc8df MD |
3478 | ht_cleanup_push(ust_app_ht); |
3479 | ht_cleanup_push(ust_app_ht_by_sock); | |
3480 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
5b4a0ec0 DG |
3481 | } |
3482 | ||
3483 | /* | |
3484 | * Init UST app hash table. | |
3485 | */ | |
3486 | void ust_app_ht_alloc(void) | |
3487 | { | |
bec39940 | 3488 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
852d0037 | 3489 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3490 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
421cb601 DG |
3491 | } |
3492 | ||
78f0bacd DG |
3493 | /* |
3494 | * For a specific UST session, disable the channel for all registered apps. | |
3495 | */ | |
35a9059d | 3496 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3497 | struct ltt_ust_channel *uchan) |
3498 | { | |
3499 | int ret = 0; | |
bec39940 DG |
3500 | struct lttng_ht_iter iter; |
3501 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3502 | struct ust_app *app; |
3503 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3504 | struct ust_app_channel *ua_chan; |
78f0bacd DG |
3505 | |
3506 | if (usess == NULL || uchan == NULL) { | |
3507 | ERR("Disabling UST global channel with NULL values"); | |
3508 | ret = -1; | |
3509 | goto error; | |
3510 | } | |
3511 | ||
d9bf3ca4 | 3512 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 3513 | uchan->name, usess->id); |
78f0bacd DG |
3514 | |
3515 | rcu_read_lock(); | |
3516 | ||
3517 | /* For every registered applications */ | |
852d0037 | 3518 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3519 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3520 | if (!app->compatible) { |
3521 | /* | |
3522 | * TODO: In time, we should notice the caller of this error by | |
3523 | * telling him that this is a version error. | |
3524 | */ | |
3525 | continue; | |
3526 | } | |
78f0bacd DG |
3527 | ua_sess = lookup_session_by_app(usess, app); |
3528 | if (ua_sess == NULL) { | |
3529 | continue; | |
3530 | } | |
3531 | ||
8535a6d9 | 3532 | /* Get channel */ |
bec39940 DG |
3533 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3534 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
3535 | /* If the session if found for the app, the channel must be there */ |
3536 | assert(ua_chan_node); | |
3537 | ||
3538 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3539 | /* The channel must not be already disabled */ | |
3540 | assert(ua_chan->enabled == 1); | |
3541 | ||
3542 | /* Disable channel onto application */ | |
3543 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
3544 | if (ret < 0) { |
3545 | /* XXX: We might want to report this error at some point... */ | |
3546 | continue; | |
3547 | } | |
3548 | } | |
3549 | ||
3550 | rcu_read_unlock(); | |
3551 | ||
3552 | error: | |
3553 | return ret; | |
3554 | } | |
3555 | ||
3556 | /* | |
3557 | * For a specific UST session, enable the channel for all registered apps. | |
3558 | */ | |
35a9059d | 3559 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3560 | struct ltt_ust_channel *uchan) |
3561 | { | |
3562 | int ret = 0; | |
bec39940 | 3563 | struct lttng_ht_iter iter; |
78f0bacd DG |
3564 | struct ust_app *app; |
3565 | struct ust_app_session *ua_sess; | |
3566 | ||
3567 | if (usess == NULL || uchan == NULL) { | |
3568 | ERR("Adding UST global channel to NULL values"); | |
3569 | ret = -1; | |
3570 | goto error; | |
3571 | } | |
3572 | ||
d9bf3ca4 | 3573 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 3574 | uchan->name, usess->id); |
78f0bacd DG |
3575 | |
3576 | rcu_read_lock(); | |
3577 | ||
3578 | /* For every registered applications */ | |
852d0037 | 3579 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3580 | if (!app->compatible) { |
3581 | /* | |
3582 | * TODO: In time, we should notice the caller of this error by | |
3583 | * telling him that this is a version error. | |
3584 | */ | |
3585 | continue; | |
3586 | } | |
78f0bacd DG |
3587 | ua_sess = lookup_session_by_app(usess, app); |
3588 | if (ua_sess == NULL) { | |
3589 | continue; | |
3590 | } | |
3591 | ||
3592 | /* Enable channel onto application */ | |
3593 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
3594 | if (ret < 0) { | |
3595 | /* XXX: We might want to report this error at some point... */ | |
3596 | continue; | |
3597 | } | |
3598 | } | |
3599 | ||
3600 | rcu_read_unlock(); | |
3601 | ||
3602 | error: | |
3603 | return ret; | |
3604 | } | |
3605 | ||
b0a40d28 DG |
3606 | /* |
3607 | * Disable an event in a channel and for a specific session. | |
3608 | */ | |
35a9059d DG |
3609 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
3610 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
3611 | { |
3612 | int ret = 0; | |
bec39940 DG |
3613 | struct lttng_ht_iter iter, uiter; |
3614 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
b0a40d28 DG |
3615 | struct ust_app *app; |
3616 | struct ust_app_session *ua_sess; | |
3617 | struct ust_app_channel *ua_chan; | |
3618 | struct ust_app_event *ua_event; | |
3619 | ||
3620 | DBG("UST app disabling event %s for all apps in channel " | |
d9bf3ca4 MD |
3621 | "%s for session id %" PRIu64, |
3622 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
3623 | |
3624 | rcu_read_lock(); | |
3625 | ||
3626 | /* For all registered applications */ | |
852d0037 | 3627 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3628 | if (!app->compatible) { |
3629 | /* | |
3630 | * TODO: In time, we should notice the caller of this error by | |
3631 | * telling him that this is a version error. | |
3632 | */ | |
3633 | continue; | |
3634 | } | |
b0a40d28 DG |
3635 | ua_sess = lookup_session_by_app(usess, app); |
3636 | if (ua_sess == NULL) { | |
3637 | /* Next app */ | |
3638 | continue; | |
3639 | } | |
3640 | ||
3641 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3642 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3643 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 3644 | if (ua_chan_node == NULL) { |
d9bf3ca4 | 3645 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 3646 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
3647 | continue; |
3648 | } | |
3649 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3650 | ||
bec39940 DG |
3651 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter); |
3652 | ua_event_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 DG |
3653 | if (ua_event_node == NULL) { |
3654 | DBG2("Event %s not found in channel %s for app pid %d." | |
852d0037 | 3655 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
3656 | continue; |
3657 | } | |
3658 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
3659 | ||
7f79d3a1 | 3660 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
3661 | if (ret < 0) { |
3662 | /* XXX: Report error someday... */ | |
3663 | continue; | |
3664 | } | |
3665 | } | |
3666 | ||
3667 | rcu_read_unlock(); | |
3668 | ||
3669 | return ret; | |
3670 | } | |
3671 | ||
421cb601 | 3672 | /* |
5b4a0ec0 | 3673 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 3674 | */ |
35a9059d | 3675 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3676 | struct ltt_ust_channel *uchan) |
3677 | { | |
3d8ca23b | 3678 | int ret = 0, created; |
bec39940 | 3679 | struct lttng_ht_iter iter; |
48842b30 | 3680 | struct ust_app *app; |
3d8ca23b | 3681 | struct ust_app_session *ua_sess = NULL; |
48842b30 | 3682 | |
fc34caaa DG |
3683 | /* Very wrong code flow */ |
3684 | assert(usess); | |
3685 | assert(uchan); | |
421cb601 | 3686 | |
d9bf3ca4 | 3687 | DBG2("UST app adding channel %s to UST domain for session id %" PRIu64, |
a991f516 | 3688 | uchan->name, usess->id); |
48842b30 DG |
3689 | |
3690 | rcu_read_lock(); | |
421cb601 | 3691 | |
5b4a0ec0 | 3692 | /* For every registered applications */ |
852d0037 | 3693 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3694 | if (!app->compatible) { |
3695 | /* | |
3696 | * TODO: In time, we should notice the caller of this error by | |
3697 | * telling him that this is a version error. | |
3698 | */ | |
3699 | continue; | |
3700 | } | |
edb67388 DG |
3701 | /* |
3702 | * Create session on the tracer side and add it to app session HT. Note | |
3703 | * that if session exist, it will simply return a pointer to the ust | |
3704 | * app session. | |
3705 | */ | |
3d8ca23b DG |
3706 | ret = create_ust_app_session(usess, app, &ua_sess, &created); |
3707 | if (ret < 0) { | |
3708 | switch (ret) { | |
3709 | case -ENOTCONN: | |
3710 | /* | |
3711 | * The application's socket is not valid. Either a bad socket | |
3712 | * or a timeout on it. We can't inform the caller that for a | |
3713 | * specific app, the session failed so lets continue here. | |
3714 | */ | |
31cb5470 | 3715 | ret = 0; /* Not an error. */ |
3d8ca23b DG |
3716 | continue; |
3717 | case -ENOMEM: | |
3718 | default: | |
3719 | goto error_rcu_unlock; | |
3720 | } | |
48842b30 | 3721 | } |
3d8ca23b | 3722 | assert(ua_sess); |
48842b30 | 3723 | |
d0b96690 | 3724 | pthread_mutex_lock(&ua_sess->lock); |
d4769e14 MD |
3725 | |
3726 | if (ua_sess->deleted) { | |
3727 | pthread_mutex_unlock(&ua_sess->lock); | |
3728 | continue; | |
3729 | } | |
3730 | ||
d65d2de8 DG |
3731 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, |
3732 | sizeof(uchan->name))) { | |
ad7a9107 DG |
3733 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, &uchan->attr); |
3734 | ret = 0; | |
d65d2de8 DG |
3735 | } else { |
3736 | /* Create channel onto application. We don't need the chan ref. */ | |
3737 | ret = create_ust_app_channel(ua_sess, uchan, app, | |
3738 | LTTNG_UST_CHAN_PER_CPU, usess, NULL); | |
3739 | } | |
d0b96690 | 3740 | pthread_mutex_unlock(&ua_sess->lock); |
3d8ca23b | 3741 | if (ret < 0) { |
3d8ca23b DG |
3742 | /* Cleanup the created session if it's the case. */ |
3743 | if (created) { | |
d0b96690 | 3744 | destroy_app_session(app, ua_sess); |
3d8ca23b | 3745 | } |
31cb5470 MD |
3746 | switch (ret) { |
3747 | case -ENOTCONN: | |
3748 | /* | |
3749 | * The application's socket is not valid. Either a bad socket | |
3750 | * or a timeout on it. We can't inform the caller that for a | |
3751 | * specific app, the session failed so lets continue here. | |
3752 | */ | |
3753 | ret = 0; /* Not an error. */ | |
3754 | continue; | |
3755 | case -ENOMEM: | |
3756 | default: | |
3757 | goto error_rcu_unlock; | |
3758 | } | |
48842b30 | 3759 | } |
48842b30 | 3760 | } |
5b4a0ec0 | 3761 | |
95e047ff | 3762 | error_rcu_unlock: |
48842b30 | 3763 | rcu_read_unlock(); |
3c14c33f | 3764 | return ret; |
48842b30 DG |
3765 | } |
3766 | ||
5b4a0ec0 | 3767 | /* |
edb67388 | 3768 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 3769 | */ |
35a9059d | 3770 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3771 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3772 | { | |
3773 | int ret = 0; | |
bec39940 | 3774 | struct lttng_ht_iter iter, uiter; |
18eace3b | 3775 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
3776 | struct ust_app *app; |
3777 | struct ust_app_session *ua_sess; | |
3778 | struct ust_app_channel *ua_chan; | |
3779 | struct ust_app_event *ua_event; | |
48842b30 | 3780 | |
d9bf3ca4 | 3781 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 3782 | uevent->attr.name, usess->id); |
48842b30 | 3783 | |
edb67388 DG |
3784 | /* |
3785 | * NOTE: At this point, this function is called only if the session and | |
3786 | * channel passed are already created for all apps. and enabled on the | |
3787 | * tracer also. | |
3788 | */ | |
3789 | ||
48842b30 | 3790 | rcu_read_lock(); |
421cb601 DG |
3791 | |
3792 | /* For all registered applications */ | |
852d0037 | 3793 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3794 | if (!app->compatible) { |
3795 | /* | |
3796 | * TODO: In time, we should notice the caller of this error by | |
3797 | * telling him that this is a version error. | |
3798 | */ | |
3799 | continue; | |
3800 | } | |
edb67388 | 3801 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3802 | if (!ua_sess) { |
3803 | /* The application has problem or is probably dead. */ | |
3804 | continue; | |
3805 | } | |
ba767faf | 3806 | |
d0b96690 DG |
3807 | pthread_mutex_lock(&ua_sess->lock); |
3808 | ||
d4769e14 MD |
3809 | if (ua_sess->deleted) { |
3810 | pthread_mutex_unlock(&ua_sess->lock); | |
3811 | continue; | |
3812 | } | |
3813 | ||
edb67388 | 3814 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3815 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3816 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
31cb5470 MD |
3817 | /* |
3818 | * It is possible that the channel cannot be found is | |
3819 | * the channel/event creation occurs concurrently with | |
3820 | * an application exit. | |
3821 | */ | |
3822 | if (!ua_chan_node) { | |
3823 | pthread_mutex_unlock(&ua_sess->lock); | |
3824 | continue; | |
3825 | } | |
edb67388 DG |
3826 | |
3827 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3828 | ||
18eace3b DG |
3829 | /* Get event node */ |
3830 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
39c5a3a7 | 3831 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 3832 | if (ua_event == NULL) { |
7f79d3a1 | 3833 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 3834 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 3835 | goto next_app; |
35a9059d | 3836 | } |
35a9059d DG |
3837 | |
3838 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
3839 | if (ret < 0) { | |
d0b96690 | 3840 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 3841 | goto error; |
48842b30 | 3842 | } |
d0b96690 DG |
3843 | next_app: |
3844 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
3845 | } |
3846 | ||
7f79d3a1 | 3847 | error: |
edb67388 | 3848 | rcu_read_unlock(); |
edb67388 DG |
3849 | return ret; |
3850 | } | |
3851 | ||
3852 | /* | |
3853 | * For a specific existing UST session and UST channel, creates the event for | |
3854 | * all registered apps. | |
3855 | */ | |
35a9059d | 3856 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
3857 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3858 | { | |
3859 | int ret = 0; | |
bec39940 DG |
3860 | struct lttng_ht_iter iter, uiter; |
3861 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
3862 | struct ust_app *app; |
3863 | struct ust_app_session *ua_sess; | |
3864 | struct ust_app_channel *ua_chan; | |
3865 | ||
d9bf3ca4 | 3866 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 3867 | uevent->attr.name, usess->id); |
edb67388 | 3868 | |
edb67388 DG |
3869 | rcu_read_lock(); |
3870 | ||
3871 | /* For all registered applications */ | |
852d0037 | 3872 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3873 | if (!app->compatible) { |
3874 | /* | |
3875 | * TODO: In time, we should notice the caller of this error by | |
3876 | * telling him that this is a version error. | |
3877 | */ | |
3878 | continue; | |
3879 | } | |
edb67388 | 3880 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3881 | if (!ua_sess) { |
3882 | /* The application has problem or is probably dead. */ | |
3883 | continue; | |
3884 | } | |
48842b30 | 3885 | |
d0b96690 | 3886 | pthread_mutex_lock(&ua_sess->lock); |
d4769e14 MD |
3887 | |
3888 | if (ua_sess->deleted) { | |
3889 | pthread_mutex_unlock(&ua_sess->lock); | |
3890 | continue; | |
3891 | } | |
3892 | ||
48842b30 | 3893 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3894 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3895 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3896 | /* If the channel is not found, there is a code flow error */ |
3897 | assert(ua_chan_node); | |
3898 | ||
48842b30 DG |
3899 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3900 | ||
edb67388 | 3901 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 3902 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 3903 | if (ret < 0) { |
49c336c1 | 3904 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
3905 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
3906 | break; | |
3907 | } | |
3908 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 3909 | uevent->attr.name, app->pid); |
5b4a0ec0 | 3910 | continue; |
48842b30 | 3911 | } |
48842b30 | 3912 | } |
5b4a0ec0 | 3913 | |
48842b30 DG |
3914 | rcu_read_unlock(); |
3915 | ||
3916 | return ret; | |
3917 | } | |
3918 | ||
5b4a0ec0 DG |
3919 | /* |
3920 | * Start tracing for a specific UST session and app. | |
3921 | */ | |
b34cbebf | 3922 | static |
421cb601 | 3923 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
3924 | { |
3925 | int ret = 0; | |
48842b30 | 3926 | struct ust_app_session *ua_sess; |
48842b30 | 3927 | |
852d0037 | 3928 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 3929 | |
509cbaf8 MD |
3930 | rcu_read_lock(); |
3931 | ||
e0c7ec2b DG |
3932 | if (!app->compatible) { |
3933 | goto end; | |
3934 | } | |
3935 | ||
421cb601 DG |
3936 | ua_sess = lookup_session_by_app(usess, app); |
3937 | if (ua_sess == NULL) { | |
d42f20df DG |
3938 | /* The session is in teardown process. Ignore and continue. */ |
3939 | goto end; | |
421cb601 | 3940 | } |
48842b30 | 3941 | |
d0b96690 DG |
3942 | pthread_mutex_lock(&ua_sess->lock); |
3943 | ||
d4769e14 MD |
3944 | if (ua_sess->deleted) { |
3945 | pthread_mutex_unlock(&ua_sess->lock); | |
3946 | goto end; | |
3947 | } | |
3948 | ||
aea829b3 DG |
3949 | /* Upon restart, we skip the setup, already done */ |
3950 | if (ua_sess->started) { | |
8be98f9a | 3951 | goto skip_setup; |
aea829b3 | 3952 | } |
8be98f9a | 3953 | |
a4b92340 DG |
3954 | /* Create directories if consumer is LOCAL and has a path defined. */ |
3955 | if (usess->consumer->type == CONSUMER_DST_LOCAL && | |
3956 | strlen(usess->consumer->dst.trace_path) > 0) { | |
3957 | ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path, | |
7972aab2 | 3958 | S_IRWXU | S_IRWXG, ua_sess->euid, ua_sess->egid); |
a4b92340 DG |
3959 | if (ret < 0) { |
3960 | if (ret != -EEXIST) { | |
3961 | ERR("Trace directory creation error"); | |
d0b96690 | 3962 | goto error_unlock; |
421cb601 | 3963 | } |
173af62f | 3964 | } |
7753dea8 | 3965 | } |
aea829b3 | 3966 | |
d65d2de8 DG |
3967 | /* |
3968 | * Create the metadata for the application. This returns gracefully if a | |
3969 | * metadata was already set for the session. | |
3970 | */ | |
ad7a9107 | 3971 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer); |
421cb601 | 3972 | if (ret < 0) { |
d0b96690 | 3973 | goto error_unlock; |
421cb601 | 3974 | } |
48842b30 | 3975 | |
840cb59c | 3976 | health_code_update(); |
86acf0da | 3977 | |
8be98f9a | 3978 | skip_setup: |
421cb601 | 3979 | /* This start the UST tracing */ |
852d0037 | 3980 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
421cb601 | 3981 | if (ret < 0) { |
ffe60014 DG |
3982 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3983 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
3984 | app->pid, ret); | |
3985 | } else { | |
3986 | DBG("UST app start session failed. Application is dead."); | |
3757b385 DG |
3987 | /* |
3988 | * This is normal behavior, an application can die during the | |
3989 | * creation process. Don't report an error so the execution can | |
3990 | * continue normally. | |
3991 | */ | |
3992 | pthread_mutex_unlock(&ua_sess->lock); | |
3993 | goto end; | |
ffe60014 | 3994 | } |
d0b96690 | 3995 | goto error_unlock; |
421cb601 | 3996 | } |
5b4a0ec0 | 3997 | |
55c3953d DG |
3998 | /* Indicate that the session has been started once */ |
3999 | ua_sess->started = 1; | |
4000 | ||
d0b96690 DG |
4001 | pthread_mutex_unlock(&ua_sess->lock); |
4002 | ||
840cb59c | 4003 | health_code_update(); |
86acf0da | 4004 | |
421cb601 | 4005 | /* Quiescent wait after starting trace */ |
ffe60014 DG |
4006 | ret = ustctl_wait_quiescent(app->sock); |
4007 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4008 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4009 | app->pid, ret); | |
4010 | } | |
48842b30 | 4011 | |
e0c7ec2b DG |
4012 | end: |
4013 | rcu_read_unlock(); | |
840cb59c | 4014 | health_code_update(); |
421cb601 | 4015 | return 0; |
48842b30 | 4016 | |
d0b96690 DG |
4017 | error_unlock: |
4018 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 4019 | rcu_read_unlock(); |
840cb59c | 4020 | health_code_update(); |
421cb601 DG |
4021 | return -1; |
4022 | } | |
48842b30 | 4023 | |
8be98f9a MD |
4024 | /* |
4025 | * Stop tracing for a specific UST session and app. | |
4026 | */ | |
b34cbebf | 4027 | static |
8be98f9a MD |
4028 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
4029 | { | |
4030 | int ret = 0; | |
4031 | struct ust_app_session *ua_sess; | |
7972aab2 | 4032 | struct ust_registry_session *registry; |
8be98f9a | 4033 | |
852d0037 | 4034 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
4035 | |
4036 | rcu_read_lock(); | |
4037 | ||
e0c7ec2b | 4038 | if (!app->compatible) { |
d88aee68 | 4039 | goto end_no_session; |
e0c7ec2b DG |
4040 | } |
4041 | ||
8be98f9a MD |
4042 | ua_sess = lookup_session_by_app(usess, app); |
4043 | if (ua_sess == NULL) { | |
d88aee68 | 4044 | goto end_no_session; |
8be98f9a MD |
4045 | } |
4046 | ||
d88aee68 DG |
4047 | pthread_mutex_lock(&ua_sess->lock); |
4048 | ||
d4769e14 MD |
4049 | if (ua_sess->deleted) { |
4050 | pthread_mutex_unlock(&ua_sess->lock); | |
4051 | goto end_no_session; | |
4052 | } | |
4053 | ||
9bc07046 DG |
4054 | /* |
4055 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
4056 | * that was never started. It's possible since we can have a fail start |
4057 | * from either the application manager thread or the command thread. Simply | |
4058 | * indicate that this is a stop error. | |
9bc07046 | 4059 | */ |
f9dfc3d9 | 4060 | if (!ua_sess->started) { |
c45536e1 DG |
4061 | goto error_rcu_unlock; |
4062 | } | |
7db205b5 | 4063 | |
840cb59c | 4064 | health_code_update(); |
86acf0da | 4065 | |
9d6c7d3f | 4066 | /* This inhibits UST tracing */ |
852d0037 | 4067 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
9d6c7d3f | 4068 | if (ret < 0) { |
ffe60014 DG |
4069 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4070 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
4071 | app->pid, ret); | |
4072 | } else { | |
4073 | DBG("UST app stop session failed. Application is dead."); | |
3757b385 DG |
4074 | /* |
4075 | * This is normal behavior, an application can die during the | |
4076 | * creation process. Don't report an error so the execution can | |
4077 | * continue normally. | |
4078 | */ | |
4079 | goto end_unlock; | |
ffe60014 | 4080 | } |
9d6c7d3f DG |
4081 | goto error_rcu_unlock; |
4082 | } | |
4083 | ||
840cb59c | 4084 | health_code_update(); |
86acf0da | 4085 | |
9d6c7d3f | 4086 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
4087 | ret = ustctl_wait_quiescent(app->sock); |
4088 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4089 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4090 | app->pid, ret); | |
4091 | } | |
9d6c7d3f | 4092 | |
840cb59c | 4093 | health_code_update(); |
86acf0da | 4094 | |
b34cbebf MD |
4095 | registry = get_session_registry(ua_sess); |
4096 | assert(registry); | |
1b532a60 | 4097 | |
e3ae3c71 MD |
4098 | /* Push metadata for application before freeing the application. */ |
4099 | (void) push_metadata(registry, ua_sess->consumer); | |
b34cbebf | 4100 | |
3757b385 | 4101 | end_unlock: |
b34cbebf MD |
4102 | pthread_mutex_unlock(&ua_sess->lock); |
4103 | end_no_session: | |
4104 | rcu_read_unlock(); | |
4105 | health_code_update(); | |
4106 | return 0; | |
4107 | ||
4108 | error_rcu_unlock: | |
4109 | pthread_mutex_unlock(&ua_sess->lock); | |
4110 | rcu_read_unlock(); | |
4111 | health_code_update(); | |
4112 | return -1; | |
4113 | } | |
4114 | ||
b34cbebf | 4115 | static |
99090057 MD |
4116 | int ust_app_flush_app_session(struct ust_app *app, |
4117 | struct ust_app_session *ua_sess) | |
b34cbebf | 4118 | { |
99090057 | 4119 | int ret, retval = 0; |
b34cbebf | 4120 | struct lttng_ht_iter iter; |
b34cbebf | 4121 | struct ust_app_channel *ua_chan; |
99090057 | 4122 | struct consumer_socket *socket; |
b34cbebf | 4123 | |
99090057 | 4124 | DBG("Flushing app session buffers for ust app pid %d", app->pid); |
b34cbebf MD |
4125 | |
4126 | rcu_read_lock(); | |
4127 | ||
4128 | if (!app->compatible) { | |
99090057 | 4129 | goto end_not_compatible; |
b34cbebf MD |
4130 | } |
4131 | ||
4132 | pthread_mutex_lock(&ua_sess->lock); | |
4133 | ||
d4769e14 MD |
4134 | if (ua_sess->deleted) { |
4135 | goto end_deleted; | |
4136 | } | |
4137 | ||
b34cbebf MD |
4138 | health_code_update(); |
4139 | ||
9d6c7d3f | 4140 | /* Flushing buffers */ |
99090057 MD |
4141 | socket = consumer_find_socket_by_bitness(app->bits_per_long, |
4142 | ua_sess->consumer); | |
e3ae3c71 MD |
4143 | |
4144 | /* Flush buffers and push metadata. */ | |
4145 | switch (ua_sess->buffer_type) { | |
4146 | case LTTNG_BUFFER_PER_PID: | |
4147 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, | |
4148 | node.node) { | |
4149 | health_code_update(); | |
4150 | assert(ua_chan->is_sent); | |
4151 | ret = consumer_flush_channel(socket, ua_chan->key); | |
4152 | if (ret) { | |
4153 | ERR("Error flushing consumer channel"); | |
4154 | retval = -1; | |
4155 | continue; | |
4156 | } | |
8be98f9a | 4157 | } |
e3ae3c71 MD |
4158 | break; |
4159 | case LTTNG_BUFFER_PER_UID: | |
4160 | default: | |
4161 | assert(0); | |
4162 | break; | |
8be98f9a | 4163 | } |
8be98f9a | 4164 | |
840cb59c | 4165 | health_code_update(); |
86acf0da | 4166 | |
d4769e14 | 4167 | end_deleted: |
d88aee68 | 4168 | pthread_mutex_unlock(&ua_sess->lock); |
e3ae3c71 | 4169 | |
99090057 MD |
4170 | end_not_compatible: |
4171 | rcu_read_unlock(); | |
4172 | health_code_update(); | |
4173 | return retval; | |
4174 | } | |
4175 | ||
4176 | /* | |
e3ae3c71 MD |
4177 | * Flush buffers for all applications for a specific UST session. |
4178 | * Called with UST session lock held. | |
99090057 MD |
4179 | */ |
4180 | static | |
e3ae3c71 | 4181 | int ust_app_flush_session(struct ltt_ust_session *usess) |
99090057 MD |
4182 | |
4183 | { | |
17b1ec27 | 4184 | int ret = 0; |
99090057 | 4185 | |
e3ae3c71 | 4186 | DBG("Flushing session buffers for all ust apps"); |
99090057 MD |
4187 | |
4188 | rcu_read_lock(); | |
4189 | ||
e3ae3c71 MD |
4190 | /* Flush buffers and push metadata. */ |
4191 | switch (usess->buffer_type) { | |
4192 | case LTTNG_BUFFER_PER_UID: | |
4193 | { | |
4194 | struct buffer_reg_uid *reg; | |
4195 | struct lttng_ht_iter iter; | |
4196 | ||
4197 | /* Flush all per UID buffers associated to that session. */ | |
4198 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
4199 | struct ust_registry_session *ust_session_reg; | |
4200 | struct buffer_reg_channel *reg_chan; | |
4201 | struct consumer_socket *socket; | |
4202 | ||
4203 | /* Get consumer socket to use to push the metadata.*/ | |
4204 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
4205 | usess->consumer); | |
4206 | if (!socket) { | |
4207 | /* Ignore request if no consumer is found for the session. */ | |
4208 | continue; | |
4209 | } | |
4210 | ||
4211 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
4212 | reg_chan, node.node) { | |
4213 | /* | |
4214 | * The following call will print error values so the return | |
4215 | * code is of little importance because whatever happens, we | |
4216 | * have to try them all. | |
4217 | */ | |
4218 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
4219 | } | |
4220 | ||
4221 | ust_session_reg = reg->registry->reg.ust; | |
4222 | /* Push metadata. */ | |
4223 | (void) push_metadata(ust_session_reg, usess->consumer); | |
4224 | } | |
e3ae3c71 MD |
4225 | break; |
4226 | } | |
4227 | case LTTNG_BUFFER_PER_PID: | |
4228 | { | |
4229 | struct ust_app_session *ua_sess; | |
4230 | struct lttng_ht_iter iter; | |
4231 | struct ust_app *app; | |
4232 | ||
4233 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4234 | ua_sess = lookup_session_by_app(usess, app); | |
4235 | if (ua_sess == NULL) { | |
4236 | continue; | |
4237 | } | |
4238 | (void) ust_app_flush_app_session(app, ua_sess); | |
4239 | } | |
4240 | break; | |
4241 | } | |
4242 | default: | |
17b1ec27 | 4243 | ret = -1; |
e3ae3c71 MD |
4244 | assert(0); |
4245 | break; | |
99090057 | 4246 | } |
99090057 | 4247 | |
7db205b5 | 4248 | rcu_read_unlock(); |
840cb59c | 4249 | health_code_update(); |
99090057 | 4250 | return ret; |
8be98f9a MD |
4251 | } |
4252 | ||
84cd17c6 MD |
4253 | /* |
4254 | * Destroy a specific UST session in apps. | |
4255 | */ | |
3353de95 | 4256 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 4257 | { |
ffe60014 | 4258 | int ret; |
84cd17c6 | 4259 | struct ust_app_session *ua_sess; |
bec39940 | 4260 | struct lttng_ht_iter iter; |
d9bf3ca4 | 4261 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 4262 | |
852d0037 | 4263 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
4264 | |
4265 | rcu_read_lock(); | |
4266 | ||
e0c7ec2b DG |
4267 | if (!app->compatible) { |
4268 | goto end; | |
4269 | } | |
4270 | ||
84cd17c6 | 4271 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 4272 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 4273 | if (node == NULL) { |
d42f20df DG |
4274 | /* Session is being or is deleted. */ |
4275 | goto end; | |
84cd17c6 MD |
4276 | } |
4277 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 4278 | |
840cb59c | 4279 | health_code_update(); |
d0b96690 | 4280 | destroy_app_session(app, ua_sess); |
84cd17c6 | 4281 | |
840cb59c | 4282 | health_code_update(); |
7db205b5 | 4283 | |
84cd17c6 | 4284 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
4285 | ret = ustctl_wait_quiescent(app->sock); |
4286 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4287 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4288 | app->pid, ret); | |
4289 | } | |
e0c7ec2b DG |
4290 | end: |
4291 | rcu_read_unlock(); | |
840cb59c | 4292 | health_code_update(); |
84cd17c6 | 4293 | return 0; |
84cd17c6 MD |
4294 | } |
4295 | ||
5b4a0ec0 DG |
4296 | /* |
4297 | * Start tracing for the UST session. | |
4298 | */ | |
421cb601 DG |
4299 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
4300 | { | |
4301 | int ret = 0; | |
bec39940 | 4302 | struct lttng_ht_iter iter; |
421cb601 | 4303 | struct ust_app *app; |
48842b30 | 4304 | |
421cb601 DG |
4305 | DBG("Starting all UST traces"); |
4306 | ||
4307 | rcu_read_lock(); | |
421cb601 | 4308 | |
852d0037 | 4309 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
421cb601 | 4310 | ret = ust_app_start_trace(usess, app); |
48842b30 | 4311 | if (ret < 0) { |
5b4a0ec0 DG |
4312 | /* Continue to next apps even on error */ |
4313 | continue; | |
48842b30 | 4314 | } |
48842b30 | 4315 | } |
5b4a0ec0 | 4316 | |
48842b30 DG |
4317 | rcu_read_unlock(); |
4318 | ||
4319 | return 0; | |
4320 | } | |
487cf67c | 4321 | |
8be98f9a MD |
4322 | /* |
4323 | * Start tracing for the UST session. | |
e3ae3c71 | 4324 | * Called with UST session lock held. |
8be98f9a MD |
4325 | */ |
4326 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
4327 | { | |
4328 | int ret = 0; | |
bec39940 | 4329 | struct lttng_ht_iter iter; |
8be98f9a MD |
4330 | struct ust_app *app; |
4331 | ||
4332 | DBG("Stopping all UST traces"); | |
4333 | ||
4334 | rcu_read_lock(); | |
4335 | ||
b34cbebf MD |
4336 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4337 | ret = ust_app_stop_trace(usess, app); | |
4338 | if (ret < 0) { | |
4339 | /* Continue to next apps even on error */ | |
4340 | continue; | |
4341 | } | |
4342 | } | |
4343 | ||
e3ae3c71 | 4344 | (void) ust_app_flush_session(usess); |
8be98f9a MD |
4345 | |
4346 | rcu_read_unlock(); | |
4347 | ||
4348 | return 0; | |
4349 | } | |
4350 | ||
84cd17c6 MD |
4351 | /* |
4352 | * Destroy app UST session. | |
4353 | */ | |
4354 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
4355 | { | |
4356 | int ret = 0; | |
bec39940 | 4357 | struct lttng_ht_iter iter; |
84cd17c6 MD |
4358 | struct ust_app *app; |
4359 | ||
4360 | DBG("Destroy all UST traces"); | |
4361 | ||
4362 | rcu_read_lock(); | |
4363 | ||
852d0037 | 4364 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 4365 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
4366 | if (ret < 0) { |
4367 | /* Continue to next apps even on error */ | |
4368 | continue; | |
4369 | } | |
4370 | } | |
4371 | ||
4372 | rcu_read_unlock(); | |
4373 | ||
4374 | return 0; | |
4375 | } | |
4376 | ||
5b4a0ec0 DG |
4377 | /* |
4378 | * Add channels/events from UST global domain to registered apps at sock. | |
4379 | */ | |
487cf67c DG |
4380 | void ust_app_global_update(struct ltt_ust_session *usess, int sock) |
4381 | { | |
55c54cce | 4382 | int ret = 0; |
31746f93 | 4383 | struct lttng_ht_iter iter, uiter; |
487cf67c | 4384 | struct ust_app *app; |
3d8ca23b | 4385 | struct ust_app_session *ua_sess = NULL; |
487cf67c DG |
4386 | struct ust_app_channel *ua_chan; |
4387 | struct ust_app_event *ua_event; | |
727d5404 | 4388 | struct ust_app_ctx *ua_ctx; |
1f3580c7 | 4389 | |
95e047ff | 4390 | assert(usess); |
ffe60014 | 4391 | assert(sock >= 0); |
1f3580c7 | 4392 | |
d9bf3ca4 | 4393 | DBG2("UST app global update for app sock %d for session id %" PRIu64, sock, |
a991f516 | 4394 | usess->id); |
487cf67c | 4395 | |
284d8f55 DG |
4396 | rcu_read_lock(); |
4397 | ||
f20baf8e | 4398 | app = ust_app_find_by_sock(sock); |
487cf67c | 4399 | if (app == NULL) { |
d88aee68 DG |
4400 | /* |
4401 | * Application can be unregistered before so this is possible hence | |
4402 | * simply stopping the update. | |
4403 | */ | |
4404 | DBG3("UST app update failed to find app sock %d", sock); | |
487cf67c DG |
4405 | goto error; |
4406 | } | |
4407 | ||
e0c7ec2b DG |
4408 | if (!app->compatible) { |
4409 | goto error; | |
4410 | } | |
4411 | ||
3d8ca23b DG |
4412 | ret = create_ust_app_session(usess, app, &ua_sess, NULL); |
4413 | if (ret < 0) { | |
4414 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
4415 | goto error; |
4416 | } | |
3d8ca23b | 4417 | assert(ua_sess); |
487cf67c | 4418 | |
d0b96690 DG |
4419 | pthread_mutex_lock(&ua_sess->lock); |
4420 | ||
d4769e14 MD |
4421 | if (ua_sess->deleted) { |
4422 | pthread_mutex_unlock(&ua_sess->lock); | |
4423 | goto error; | |
4424 | } | |
4425 | ||
284d8f55 | 4426 | /* |
d0b96690 | 4427 | * We can iterate safely here over all UST app session since the create ust |
284d8f55 DG |
4428 | * app session above made a shadow copy of the UST global domain from the |
4429 | * ltt ust session. | |
4430 | */ | |
bec39940 DG |
4431 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
4432 | node.node) { | |
ad7a9107 | 4433 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
31cb5470 | 4434 | if (ret < 0 && ret != -ENOTCONN) { |
ad7a9107 | 4435 | /* |
31cb5470 MD |
4436 | * Stop everything. On error, the application |
4437 | * failed, no more file descriptor are available | |
4438 | * or ENOMEM so stopping here is the only thing | |
4439 | * we can do for now. The only exception is | |
4440 | * -ENOTCONN, which indicates that the application | |
4441 | * has exit. | |
ad7a9107 DG |
4442 | */ |
4443 | goto error_unlock; | |
487cf67c DG |
4444 | } |
4445 | ||
31746f93 DG |
4446 | /* |
4447 | * Add context using the list so they are enabled in the same order the | |
4448 | * user added them. | |
4449 | */ | |
4450 | cds_list_for_each_entry(ua_ctx, &ua_chan->ctx_list, list) { | |
727d5404 DG |
4451 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); |
4452 | if (ret < 0) { | |
d0b96690 | 4453 | goto error_unlock; |
727d5404 DG |
4454 | } |
4455 | } | |
4456 | ||
4457 | ||
284d8f55 | 4458 | /* For each events */ |
bec39940 DG |
4459 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
4460 | node.node) { | |
284d8f55 DG |
4461 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
4462 | if (ret < 0) { | |
d0b96690 | 4463 | goto error_unlock; |
487cf67c | 4464 | } |
36dc12cc | 4465 | } |
487cf67c DG |
4466 | } |
4467 | ||
d0b96690 DG |
4468 | pthread_mutex_unlock(&ua_sess->lock); |
4469 | ||
14fb1ebe | 4470 | if (usess->active) { |
421cb601 | 4471 | ret = ust_app_start_trace(usess, app); |
36dc12cc | 4472 | if (ret < 0) { |
36dc12cc DG |
4473 | goto error; |
4474 | } | |
4475 | ||
852d0037 | 4476 | DBG2("UST trace started for app pid %d", app->pid); |
36dc12cc DG |
4477 | } |
4478 | ||
ffe60014 DG |
4479 | /* Everything went well at this point. */ |
4480 | rcu_read_unlock(); | |
4481 | return; | |
4482 | ||
d0b96690 DG |
4483 | error_unlock: |
4484 | pthread_mutex_unlock(&ua_sess->lock); | |
487cf67c | 4485 | error: |
ffe60014 | 4486 | if (ua_sess) { |
d0b96690 | 4487 | destroy_app_session(app, ua_sess); |
ffe60014 | 4488 | } |
487cf67c DG |
4489 | rcu_read_unlock(); |
4490 | return; | |
4491 | } | |
55cc08a6 DG |
4492 | |
4493 | /* | |
4494 | * Add context to a specific channel for global UST domain. | |
4495 | */ | |
4496 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
4497 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
4498 | { | |
4499 | int ret = 0; | |
bec39940 DG |
4500 | struct lttng_ht_node_str *ua_chan_node; |
4501 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
4502 | struct ust_app_channel *ua_chan = NULL; |
4503 | struct ust_app_session *ua_sess; | |
4504 | struct ust_app *app; | |
4505 | ||
4506 | rcu_read_lock(); | |
4507 | ||
852d0037 | 4508 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4509 | if (!app->compatible) { |
4510 | /* | |
4511 | * TODO: In time, we should notice the caller of this error by | |
4512 | * telling him that this is a version error. | |
4513 | */ | |
4514 | continue; | |
4515 | } | |
55cc08a6 DG |
4516 | ua_sess = lookup_session_by_app(usess, app); |
4517 | if (ua_sess == NULL) { | |
4518 | continue; | |
4519 | } | |
4520 | ||
d0b96690 | 4521 | pthread_mutex_lock(&ua_sess->lock); |
d4769e14 MD |
4522 | |
4523 | if (ua_sess->deleted) { | |
4524 | pthread_mutex_unlock(&ua_sess->lock); | |
4525 | continue; | |
4526 | } | |
4527 | ||
55cc08a6 | 4528 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4529 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4530 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 4531 | if (ua_chan_node == NULL) { |
d0b96690 | 4532 | goto next_app; |
55cc08a6 DG |
4533 | } |
4534 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
4535 | node); | |
55cc08a6 DG |
4536 | ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app); |
4537 | if (ret < 0) { | |
d0b96690 | 4538 | goto next_app; |
55cc08a6 | 4539 | } |
d0b96690 DG |
4540 | next_app: |
4541 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
4542 | } |
4543 | ||
55cc08a6 DG |
4544 | rcu_read_unlock(); |
4545 | return ret; | |
4546 | } | |
4547 | ||
76d45b40 DG |
4548 | /* |
4549 | * Enable event for a channel from a UST session for a specific PID. | |
4550 | */ | |
4551 | int ust_app_enable_event_pid(struct ltt_ust_session *usess, | |
4552 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4553 | { | |
4554 | int ret = 0; | |
bec39940 | 4555 | struct lttng_ht_iter iter; |
18eace3b | 4556 | struct lttng_ht_node_str *ua_chan_node; |
76d45b40 DG |
4557 | struct ust_app *app; |
4558 | struct ust_app_session *ua_sess; | |
4559 | struct ust_app_channel *ua_chan; | |
4560 | struct ust_app_event *ua_event; | |
4561 | ||
4562 | DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid); | |
4563 | ||
4564 | rcu_read_lock(); | |
4565 | ||
4566 | app = ust_app_find_by_pid(pid); | |
4567 | if (app == NULL) { | |
4568 | ERR("UST app enable event per PID %d not found", pid); | |
4569 | ret = -1; | |
d0b96690 | 4570 | goto end; |
76d45b40 DG |
4571 | } |
4572 | ||
e0c7ec2b DG |
4573 | if (!app->compatible) { |
4574 | ret = 0; | |
d0b96690 | 4575 | goto end; |
e0c7ec2b DG |
4576 | } |
4577 | ||
76d45b40 | 4578 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4579 | if (!ua_sess) { |
4580 | /* The application has problem or is probably dead. */ | |
d0b96690 DG |
4581 | ret = 0; |
4582 | goto end; | |
c4a1715b | 4583 | } |
76d45b40 | 4584 | |
d0b96690 | 4585 | pthread_mutex_lock(&ua_sess->lock); |
d4769e14 MD |
4586 | |
4587 | if (ua_sess->deleted) { | |
4588 | ret = 0; | |
4589 | goto end_unlock; | |
4590 | } | |
4591 | ||
76d45b40 | 4592 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4593 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4594 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
76d45b40 DG |
4595 | /* If the channel is not found, there is a code flow error */ |
4596 | assert(ua_chan_node); | |
4597 | ||
4598 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4599 | ||
18eace3b | 4600 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 4601 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 4602 | if (ua_event == NULL) { |
76d45b40 DG |
4603 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
4604 | if (ret < 0) { | |
d0b96690 | 4605 | goto end_unlock; |
76d45b40 DG |
4606 | } |
4607 | } else { | |
76d45b40 DG |
4608 | ret = enable_ust_app_event(ua_sess, ua_event, app); |
4609 | if (ret < 0) { | |
d0b96690 | 4610 | goto end_unlock; |
76d45b40 DG |
4611 | } |
4612 | } | |
4613 | ||
d0b96690 DG |
4614 | end_unlock: |
4615 | pthread_mutex_unlock(&ua_sess->lock); | |
4616 | end: | |
76d45b40 DG |
4617 | rcu_read_unlock(); |
4618 | return ret; | |
4619 | } | |
7f79d3a1 | 4620 | |
4466912f DG |
4621 | /* |
4622 | * Calibrate registered applications. | |
4623 | */ | |
4624 | int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate) | |
4625 | { | |
4626 | int ret = 0; | |
4627 | struct lttng_ht_iter iter; | |
4628 | struct ust_app *app; | |
4629 | ||
4630 | rcu_read_lock(); | |
4631 | ||
852d0037 | 4632 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4466912f DG |
4633 | if (!app->compatible) { |
4634 | /* | |
4635 | * TODO: In time, we should notice the caller of this error by | |
4636 | * telling him that this is a version error. | |
4637 | */ | |
4638 | continue; | |
4639 | } | |
4640 | ||
840cb59c | 4641 | health_code_update(); |
86acf0da | 4642 | |
852d0037 | 4643 | ret = ustctl_calibrate(app->sock, calibrate); |
4466912f DG |
4644 | if (ret < 0) { |
4645 | switch (ret) { | |
4646 | case -ENOSYS: | |
4647 | /* Means that it's not implemented on the tracer side. */ | |
4648 | ret = 0; | |
4649 | break; | |
4650 | default: | |
4466912f | 4651 | DBG2("Calibrate app PID %d returned with error %d", |
852d0037 | 4652 | app->pid, ret); |
4466912f DG |
4653 | break; |
4654 | } | |
4655 | } | |
4656 | } | |
4657 | ||
4658 | DBG("UST app global domain calibration finished"); | |
4659 | ||
4660 | rcu_read_unlock(); | |
4661 | ||
840cb59c | 4662 | health_code_update(); |
86acf0da | 4663 | |
4466912f DG |
4664 | return ret; |
4665 | } | |
d0b96690 DG |
4666 | |
4667 | /* | |
4668 | * Receive registration and populate the given msg structure. | |
4669 | * | |
4670 | * On success return 0 else a negative value returned by the ustctl call. | |
4671 | */ | |
4672 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
4673 | { | |
4674 | int ret; | |
4675 | uint32_t pid, ppid, uid, gid; | |
4676 | ||
4677 | assert(msg); | |
4678 | ||
4679 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
4680 | &pid, &ppid, &uid, &gid, | |
4681 | &msg->bits_per_long, | |
4682 | &msg->uint8_t_alignment, | |
4683 | &msg->uint16_t_alignment, | |
4684 | &msg->uint32_t_alignment, | |
4685 | &msg->uint64_t_alignment, | |
4686 | &msg->long_alignment, | |
4687 | &msg->byte_order, | |
4688 | msg->name); | |
4689 | if (ret < 0) { | |
4690 | switch (-ret) { | |
4691 | case EPIPE: | |
4692 | case ECONNRESET: | |
4693 | case LTTNG_UST_ERR_EXITING: | |
4694 | DBG3("UST app recv reg message failed. Application died"); | |
4695 | break; | |
4696 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
4697 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
4698 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
4699 | LTTNG_UST_ABI_MINOR_VERSION); | |
4700 | break; | |
4701 | default: | |
4702 | ERR("UST app recv reg message failed with ret %d", ret); | |
4703 | break; | |
4704 | } | |
4705 | goto error; | |
4706 | } | |
4707 | msg->pid = (pid_t) pid; | |
4708 | msg->ppid = (pid_t) ppid; | |
4709 | msg->uid = (uid_t) uid; | |
4710 | msg->gid = (gid_t) gid; | |
4711 | ||
4712 | error: | |
4713 | return ret; | |
4714 | } | |
4715 | ||
d88aee68 DG |
4716 | /* |
4717 | * Return a ust app channel object using the application object and the channel | |
4718 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
4719 | * lock MUST be acquired before calling this function. | |
4720 | */ | |
d0b96690 DG |
4721 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
4722 | int objd) | |
4723 | { | |
4724 | struct lttng_ht_node_ulong *node; | |
4725 | struct lttng_ht_iter iter; | |
4726 | struct ust_app_channel *ua_chan = NULL; | |
4727 | ||
4728 | assert(app); | |
4729 | ||
4730 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
4731 | node = lttng_ht_iter_get_node_ulong(&iter); | |
4732 | if (node == NULL) { | |
4733 | DBG2("UST app channel find by objd %d not found", objd); | |
4734 | goto error; | |
4735 | } | |
4736 | ||
4737 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
4738 | ||
4739 | error: | |
4740 | return ua_chan; | |
4741 | } | |
4742 | ||
d88aee68 DG |
4743 | /* |
4744 | * Reply to a register channel notification from an application on the notify | |
4745 | * socket. The channel metadata is also created. | |
4746 | * | |
4747 | * The session UST registry lock is acquired in this function. | |
4748 | * | |
4749 | * On success 0 is returned else a negative value. | |
4750 | */ | |
d0b96690 DG |
4751 | static int reply_ust_register_channel(int sock, int sobjd, int cobjd, |
4752 | size_t nr_fields, struct ustctl_field *fields) | |
4753 | { | |
4754 | int ret, ret_code = 0; | |
4755 | uint32_t chan_id, reg_count; | |
7972aab2 | 4756 | uint64_t chan_reg_key; |
d0b96690 DG |
4757 | enum ustctl_channel_header type; |
4758 | struct ust_app *app; | |
4759 | struct ust_app_channel *ua_chan; | |
4760 | struct ust_app_session *ua_sess; | |
7972aab2 | 4761 | struct ust_registry_session *registry; |
45893984 | 4762 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
4763 | |
4764 | rcu_read_lock(); | |
4765 | ||
4766 | /* Lookup application. If not found, there is a code flow error. */ | |
4767 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4768 | if (!app) { |
4769 | DBG("Application socket %d is being teardown. Abort event notify", | |
4770 | sock); | |
4771 | ret = 0; | |
d5d629b5 | 4772 | free(fields); |
d88aee68 DG |
4773 | goto error_rcu_unlock; |
4774 | } | |
d0b96690 | 4775 | |
4950b860 | 4776 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4777 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4778 | if (!ua_chan) { |
4779 | DBG("Application channel is being teardown. Abort event notify"); | |
4780 | ret = 0; | |
d5d629b5 | 4781 | free(fields); |
4950b860 MD |
4782 | goto error_rcu_unlock; |
4783 | } | |
4784 | ||
d0b96690 DG |
4785 | assert(ua_chan->session); |
4786 | ua_sess = ua_chan->session; | |
d0b96690 | 4787 | |
7972aab2 DG |
4788 | /* Get right session registry depending on the session buffer type. */ |
4789 | registry = get_session_registry(ua_sess); | |
4790 | assert(registry); | |
45893984 | 4791 | |
7972aab2 DG |
4792 | /* Depending on the buffer type, a different channel key is used. */ |
4793 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4794 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 4795 | } else { |
7972aab2 | 4796 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
4797 | } |
4798 | ||
7972aab2 DG |
4799 | pthread_mutex_lock(®istry->lock); |
4800 | ||
4801 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
4802 | assert(chan_reg); | |
4803 | ||
4804 | if (!chan_reg->register_done) { | |
4805 | reg_count = ust_registry_get_event_count(chan_reg); | |
4806 | if (reg_count < 31) { | |
4807 | type = USTCTL_CHANNEL_HEADER_COMPACT; | |
4808 | } else { | |
4809 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
4810 | } | |
4811 | ||
4812 | chan_reg->nr_ctx_fields = nr_fields; | |
4813 | chan_reg->ctx_fields = fields; | |
4814 | chan_reg->header_type = type; | |
d0b96690 | 4815 | } else { |
7972aab2 DG |
4816 | /* Get current already assigned values. */ |
4817 | type = chan_reg->header_type; | |
d5d629b5 DG |
4818 | free(fields); |
4819 | /* Set to NULL so the error path does not do a double free. */ | |
4820 | fields = NULL; | |
d0b96690 | 4821 | } |
7972aab2 DG |
4822 | /* Channel id is set during the object creation. */ |
4823 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
4824 | |
4825 | /* Append to metadata */ | |
7972aab2 DG |
4826 | if (!chan_reg->metadata_dumped) { |
4827 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
4828 | if (ret_code) { |
4829 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
4830 | goto reply; | |
4831 | } | |
4832 | } | |
4833 | ||
4834 | reply: | |
7972aab2 DG |
4835 | DBG3("UST app replying to register channel key %" PRIu64 |
4836 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
4837 | ret_code); | |
d0b96690 DG |
4838 | |
4839 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
4840 | if (ret < 0) { | |
4841 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4842 | ERR("UST app reply channel failed with ret %d", ret); | |
4843 | } else { | |
4844 | DBG3("UST app reply channel failed. Application died"); | |
4845 | } | |
4846 | goto error; | |
4847 | } | |
4848 | ||
7972aab2 DG |
4849 | /* This channel registry registration is completed. */ |
4850 | chan_reg->register_done = 1; | |
4851 | ||
d0b96690 | 4852 | error: |
7972aab2 | 4853 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4854 | error_rcu_unlock: |
d0b96690 | 4855 | rcu_read_unlock(); |
d5d629b5 DG |
4856 | if (ret) { |
4857 | free(fields); | |
4858 | } | |
d0b96690 DG |
4859 | return ret; |
4860 | } | |
4861 | ||
d88aee68 DG |
4862 | /* |
4863 | * Add event to the UST channel registry. When the event is added to the | |
4864 | * registry, the metadata is also created. Once done, this replies to the | |
4865 | * application with the appropriate error code. | |
4866 | * | |
4867 | * The session UST registry lock is acquired in the function. | |
4868 | * | |
4869 | * On success 0 is returned else a negative value. | |
4870 | */ | |
d0b96690 DG |
4871 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
4872 | char *sig, size_t nr_fields, struct ustctl_field *fields, int loglevel, | |
4873 | char *model_emf_uri) | |
4874 | { | |
4875 | int ret, ret_code; | |
4876 | uint32_t event_id = 0; | |
7972aab2 | 4877 | uint64_t chan_reg_key; |
d0b96690 DG |
4878 | struct ust_app *app; |
4879 | struct ust_app_channel *ua_chan; | |
4880 | struct ust_app_session *ua_sess; | |
7972aab2 | 4881 | struct ust_registry_session *registry; |
d0b96690 DG |
4882 | |
4883 | rcu_read_lock(); | |
4884 | ||
4885 | /* Lookup application. If not found, there is a code flow error. */ | |
4886 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4887 | if (!app) { |
4888 | DBG("Application socket %d is being teardown. Abort event notify", | |
4889 | sock); | |
4890 | ret = 0; | |
d5d629b5 DG |
4891 | free(sig); |
4892 | free(fields); | |
4893 | free(model_emf_uri); | |
d88aee68 DG |
4894 | goto error_rcu_unlock; |
4895 | } | |
d0b96690 | 4896 | |
4950b860 | 4897 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4898 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4899 | if (!ua_chan) { |
4900 | DBG("Application channel is being teardown. Abort event notify"); | |
4901 | ret = 0; | |
d5d629b5 DG |
4902 | free(sig); |
4903 | free(fields); | |
4904 | free(model_emf_uri); | |
4950b860 MD |
4905 | goto error_rcu_unlock; |
4906 | } | |
4907 | ||
d0b96690 DG |
4908 | assert(ua_chan->session); |
4909 | ua_sess = ua_chan->session; | |
4910 | ||
7972aab2 DG |
4911 | registry = get_session_registry(ua_sess); |
4912 | assert(registry); | |
4913 | ||
4914 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4915 | chan_reg_key = ua_chan->tracing_channel_id; | |
4916 | } else { | |
4917 | chan_reg_key = ua_chan->key; | |
4918 | } | |
4919 | ||
4920 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 4921 | |
d5d629b5 DG |
4922 | /* |
4923 | * From this point on, this call acquires the ownership of the sig, fields | |
4924 | * and model_emf_uri meaning any free are done inside it if needed. These | |
4925 | * three variables MUST NOT be read/write after this. | |
4926 | */ | |
7972aab2 | 4927 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
45893984 | 4928 | sobjd, cobjd, name, sig, nr_fields, fields, loglevel, |
8494bda5 MD |
4929 | model_emf_uri, ua_sess->buffer_type, &event_id, |
4930 | app); | |
d0b96690 DG |
4931 | |
4932 | /* | |
4933 | * The return value is returned to ustctl so in case of an error, the | |
4934 | * application can be notified. In case of an error, it's important not to | |
4935 | * return a negative error or else the application will get closed. | |
4936 | */ | |
4937 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
4938 | if (ret < 0) { | |
4939 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4940 | ERR("UST app reply event failed with ret %d", ret); | |
4941 | } else { | |
4942 | DBG3("UST app reply event failed. Application died"); | |
4943 | } | |
4944 | /* | |
4945 | * No need to wipe the create event since the application socket will | |
4946 | * get close on error hence cleaning up everything by itself. | |
4947 | */ | |
4948 | goto error; | |
4949 | } | |
4950 | ||
7972aab2 DG |
4951 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
4952 | name, event_id); | |
d88aee68 | 4953 | |
d0b96690 | 4954 | error: |
7972aab2 | 4955 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4956 | error_rcu_unlock: |
d0b96690 DG |
4957 | rcu_read_unlock(); |
4958 | return ret; | |
4959 | } | |
4960 | ||
d88aee68 DG |
4961 | /* |
4962 | * Handle application notification through the given notify socket. | |
4963 | * | |
4964 | * Return 0 on success or else a negative value. | |
4965 | */ | |
d0b96690 DG |
4966 | int ust_app_recv_notify(int sock) |
4967 | { | |
4968 | int ret; | |
4969 | enum ustctl_notify_cmd cmd; | |
4970 | ||
4971 | DBG3("UST app receiving notify from sock %d", sock); | |
4972 | ||
4973 | ret = ustctl_recv_notify(sock, &cmd); | |
4974 | if (ret < 0) { | |
4975 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4976 | ERR("UST app recv notify failed with ret %d", ret); | |
4977 | } else { | |
4978 | DBG3("UST app recv notify failed. Application died"); | |
4979 | } | |
4980 | goto error; | |
4981 | } | |
4982 | ||
4983 | switch (cmd) { | |
4984 | case USTCTL_NOTIFY_CMD_EVENT: | |
4985 | { | |
4986 | int sobjd, cobjd, loglevel; | |
4987 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; | |
4988 | size_t nr_fields; | |
4989 | struct ustctl_field *fields; | |
4990 | ||
4991 | DBG2("UST app ustctl register event received"); | |
4992 | ||
4993 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, &loglevel, | |
4994 | &sig, &nr_fields, &fields, &model_emf_uri); | |
4995 | if (ret < 0) { | |
4996 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4997 | ERR("UST app recv event failed with ret %d", ret); | |
4998 | } else { | |
4999 | DBG3("UST app recv event failed. Application died"); | |
5000 | } | |
5001 | goto error; | |
5002 | } | |
5003 | ||
d5d629b5 DG |
5004 | /* |
5005 | * Add event to the UST registry coming from the notify socket. This | |
5006 | * call will free if needed the sig, fields and model_emf_uri. This | |
5007 | * code path loses the ownsership of these variables and transfer them | |
5008 | * to the this function. | |
5009 | */ | |
d0b96690 DG |
5010 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
5011 | fields, loglevel, model_emf_uri); | |
5012 | if (ret < 0) { | |
5013 | goto error; | |
5014 | } | |
5015 | ||
5016 | break; | |
5017 | } | |
5018 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
5019 | { | |
5020 | int sobjd, cobjd; | |
5021 | size_t nr_fields; | |
5022 | struct ustctl_field *fields; | |
5023 | ||
5024 | DBG2("UST app ustctl register channel received"); | |
5025 | ||
5026 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
5027 | &fields); | |
5028 | if (ret < 0) { | |
5029 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5030 | ERR("UST app recv channel failed with ret %d", ret); | |
5031 | } else { | |
5032 | DBG3("UST app recv channel failed. Application died"); | |
5033 | } | |
5034 | goto error; | |
5035 | } | |
5036 | ||
d5d629b5 DG |
5037 | /* |
5038 | * The fields ownership are transfered to this function call meaning | |
5039 | * that if needed it will be freed. After this, it's invalid to access | |
5040 | * fields or clean it up. | |
5041 | */ | |
d0b96690 DG |
5042 | ret = reply_ust_register_channel(sock, sobjd, cobjd, nr_fields, |
5043 | fields); | |
5044 | if (ret < 0) { | |
5045 | goto error; | |
5046 | } | |
5047 | ||
5048 | break; | |
5049 | } | |
5050 | default: | |
5051 | /* Should NEVER happen. */ | |
5052 | assert(0); | |
5053 | } | |
5054 | ||
5055 | error: | |
5056 | return ret; | |
5057 | } | |
d88aee68 DG |
5058 | |
5059 | /* | |
5060 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
5061 | * corresponding application. On failure, the call_rcu to close the socket is | |
5062 | * executed. If an application is found, it tries to delete it from the notify | |
5063 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
5064 | * | |
5065 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
5066 | * call RCU is not done but the rest of the cleanup is. | |
5067 | */ | |
5068 | void ust_app_notify_sock_unregister(int sock) | |
5069 | { | |
5070 | int err_enomem = 0; | |
5071 | struct lttng_ht_iter iter; | |
5072 | struct ust_app *app; | |
5073 | struct ust_app_notify_sock_obj *obj; | |
5074 | ||
5075 | assert(sock >= 0); | |
5076 | ||
5077 | rcu_read_lock(); | |
5078 | ||
5079 | obj = zmalloc(sizeof(*obj)); | |
5080 | if (!obj) { | |
5081 | /* | |
5082 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
5083 | * procedure but the call_rcu will not be called. In this case, we | |
5084 | * accept the fd leak rather than possibly creating an unsynchronized | |
5085 | * state between threads. | |
5086 | * | |
5087 | * TODO: The notify object should be created once the notify socket is | |
5088 | * registered and stored independantely from the ust app object. The | |
5089 | * tricky part is to synchronize the teardown of the application and | |
5090 | * this notify object. Let's keep that in mind so we can avoid this | |
5091 | * kind of shenanigans with ENOMEM in the teardown path. | |
5092 | */ | |
5093 | err_enomem = 1; | |
5094 | } else { | |
5095 | obj->fd = sock; | |
5096 | } | |
5097 | ||
5098 | DBG("UST app notify socket unregister %d", sock); | |
5099 | ||
5100 | /* | |
5101 | * Lookup application by notify socket. If this fails, this means that the | |
5102 | * hash table delete has already been done by the application | |
5103 | * unregistration process so we can safely close the notify socket in a | |
5104 | * call RCU. | |
5105 | */ | |
5106 | app = find_app_by_notify_sock(sock); | |
5107 | if (!app) { | |
5108 | goto close_socket; | |
5109 | } | |
5110 | ||
5111 | iter.iter.node = &app->notify_sock_n.node; | |
5112 | ||
5113 | /* | |
5114 | * Whatever happens here either we fail or succeed, in both cases we have | |
5115 | * to close the socket after a grace period to continue to the call RCU | |
5116 | * here. If the deletion is successful, the application is not visible | |
5117 | * anymore by other threads and is it fails it means that it was already | |
5118 | * deleted from the hash table so either way we just have to close the | |
5119 | * socket. | |
5120 | */ | |
5121 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
5122 | ||
5123 | close_socket: | |
5124 | rcu_read_unlock(); | |
5125 | ||
5126 | /* | |
5127 | * Close socket after a grace period to avoid for the socket to be reused | |
5128 | * before the application object is freed creating potential race between | |
5129 | * threads trying to add unique in the global hash table. | |
5130 | */ | |
5131 | if (!err_enomem) { | |
5132 | call_rcu(&obj->head, close_notify_sock_rcu); | |
5133 | } | |
5134 | } | |
f45e313d DG |
5135 | |
5136 | /* | |
5137 | * Destroy a ust app data structure and free its memory. | |
5138 | */ | |
5139 | void ust_app_destroy(struct ust_app *app) | |
5140 | { | |
5141 | if (!app) { | |
5142 | return; | |
5143 | } | |
5144 | ||
5145 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
5146 | } | |
6dc3064a DG |
5147 | |
5148 | /* | |
5149 | * Take a snapshot for a given UST session. The snapshot is sent to the given | |
5150 | * output. | |
5151 | * | |
5152 | * Return 0 on success or else a negative value. | |
5153 | */ | |
5154 | int ust_app_snapshot_record(struct ltt_ust_session *usess, | |
135347bd MD |
5155 | struct snapshot_output *output, int wait, |
5156 | uint64_t nb_packets_per_stream) | |
6dc3064a DG |
5157 | { |
5158 | int ret = 0; | |
7badf927 | 5159 | unsigned int snapshot_done = 0; |
6dc3064a DG |
5160 | struct lttng_ht_iter iter; |
5161 | struct ust_app *app; | |
af706bb7 | 5162 | char pathname[PATH_MAX]; |
6dc3064a DG |
5163 | |
5164 | assert(usess); | |
5165 | assert(output); | |
5166 | ||
5167 | rcu_read_lock(); | |
5168 | ||
8c924c7b MD |
5169 | switch (usess->buffer_type) { |
5170 | case LTTNG_BUFFER_PER_UID: | |
5171 | { | |
5172 | struct buffer_reg_uid *reg; | |
6dc3064a | 5173 | |
8c924c7b MD |
5174 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
5175 | struct buffer_reg_channel *reg_chan; | |
5176 | struct consumer_socket *socket; | |
6dc3064a | 5177 | |
8c924c7b MD |
5178 | /* Get consumer socket to use to push the metadata.*/ |
5179 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
5180 | usess->consumer); | |
5181 | if (!socket) { | |
5182 | ret = -EINVAL; | |
5183 | goto error; | |
5184 | } | |
6dc3064a | 5185 | |
8c924c7b MD |
5186 | memset(pathname, 0, sizeof(pathname)); |
5187 | ret = snprintf(pathname, sizeof(pathname), | |
5188 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH, | |
5189 | reg->uid, reg->bits_per_long); | |
5190 | if (ret < 0) { | |
5191 | PERROR("snprintf snapshot path"); | |
5192 | goto error; | |
5193 | } | |
5194 | ||
5195 | /* Add the UST default trace dir to path. */ | |
5196 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
5197 | reg_chan, node.node) { | |
68808f4e DG |
5198 | ret = consumer_snapshot_channel(socket, reg_chan->consumer_key, |
5199 | output, 0, usess->uid, usess->gid, pathname, wait, | |
135347bd | 5200 | nb_packets_per_stream); |
8c924c7b MD |
5201 | if (ret < 0) { |
5202 | goto error; | |
5203 | } | |
5204 | } | |
68808f4e DG |
5205 | ret = consumer_snapshot_channel(socket, |
5206 | reg->registry->reg.ust->metadata_key, output, 1, | |
135347bd | 5207 | usess->uid, usess->gid, pathname, wait, 0); |
8c924c7b MD |
5208 | if (ret < 0) { |
5209 | goto error; | |
5210 | } | |
7badf927 | 5211 | snapshot_done = 1; |
af706bb7 | 5212 | } |
8c924c7b MD |
5213 | break; |
5214 | } | |
5215 | case LTTNG_BUFFER_PER_PID: | |
5216 | { | |
5217 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5218 | struct consumer_socket *socket; | |
5219 | struct lttng_ht_iter chan_iter; | |
5220 | struct ust_app_channel *ua_chan; | |
5221 | struct ust_app_session *ua_sess; | |
5222 | struct ust_registry_session *registry; | |
5223 | ||
5224 | ua_sess = lookup_session_by_app(usess, app); | |
5225 | if (!ua_sess) { | |
5226 | /* Session not associated with this app. */ | |
5227 | continue; | |
5228 | } | |
af706bb7 | 5229 | |
8c924c7b MD |
5230 | /* Get the right consumer socket for the application. */ |
5231 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
5232 | output->consumer); | |
5233 | if (!socket) { | |
5c786ded | 5234 | ret = -EINVAL; |
5c786ded JD |
5235 | goto error; |
5236 | } | |
5237 | ||
8c924c7b MD |
5238 | /* Add the UST default trace dir to path. */ |
5239 | memset(pathname, 0, sizeof(pathname)); | |
5240 | ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "/%s", | |
5241 | ua_sess->path); | |
6dc3064a | 5242 | if (ret < 0) { |
8c924c7b | 5243 | PERROR("snprintf snapshot path"); |
6dc3064a DG |
5244 | goto error; |
5245 | } | |
6dc3064a | 5246 | |
8c924c7b MD |
5247 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, |
5248 | ua_chan, node.node) { | |
68808f4e DG |
5249 | ret = consumer_snapshot_channel(socket, ua_chan->key, output, |
5250 | 0, ua_sess->euid, ua_sess->egid, pathname, wait, | |
135347bd | 5251 | nb_packets_per_stream); |
8c924c7b MD |
5252 | if (ret < 0) { |
5253 | goto error; | |
5254 | } | |
5255 | } | |
5256 | ||
5257 | registry = get_session_registry(ua_sess); | |
5258 | assert(registry); | |
5259 | ret = consumer_snapshot_channel(socket, registry->metadata_key, output, | |
135347bd | 5260 | 1, ua_sess->euid, ua_sess->egid, pathname, wait, 0); |
8c924c7b MD |
5261 | if (ret < 0) { |
5262 | goto error; | |
5263 | } | |
7badf927 | 5264 | snapshot_done = 1; |
8c924c7b MD |
5265 | } |
5266 | break; | |
5267 | } | |
5268 | default: | |
5269 | assert(0); | |
5270 | break; | |
6dc3064a DG |
5271 | } |
5272 | ||
7badf927 DG |
5273 | if (!snapshot_done) { |
5274 | /* | |
5275 | * If no snapshot was made and we are not in the error path, this means | |
5276 | * that there are no buffers thus no (prior) application to snapshot | |
5277 | * data from so we have simply NO data. | |
5278 | */ | |
5279 | ret = -ENODATA; | |
5280 | } | |
5281 | ||
6dc3064a DG |
5282 | error: |
5283 | rcu_read_unlock(); | |
5284 | return ret; | |
5285 | } | |
5c786ded JD |
5286 | |
5287 | /* | |
135347bd | 5288 | * Return the size taken by one more packet per stream. |
5c786ded | 5289 | */ |
135347bd MD |
5290 | uint64_t ust_app_get_size_one_more_packet_per_stream(struct ltt_ust_session *usess, |
5291 | uint64_t cur_nr_packets) | |
5c786ded | 5292 | { |
135347bd | 5293 | uint64_t tot_size = 0; |
5c786ded JD |
5294 | struct ust_app *app; |
5295 | struct lttng_ht_iter iter; | |
5296 | ||
5297 | assert(usess); | |
5298 | ||
5299 | switch (usess->buffer_type) { | |
5300 | case LTTNG_BUFFER_PER_UID: | |
5301 | { | |
5302 | struct buffer_reg_uid *reg; | |
5303 | ||
5304 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
5305 | struct buffer_reg_channel *reg_chan; | |
5306 | ||
71f3589f | 5307 | rcu_read_lock(); |
5c786ded JD |
5308 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
5309 | reg_chan, node.node) { | |
135347bd MD |
5310 | if (cur_nr_packets >= reg_chan->num_subbuf) { |
5311 | /* | |
5312 | * Don't take channel into account if we | |
5313 | * already grab all its packets. | |
5314 | */ | |
5315 | continue; | |
5316 | } | |
5317 | tot_size += reg_chan->subbuf_size * reg_chan->stream_count; | |
5c786ded | 5318 | } |
71f3589f | 5319 | rcu_read_unlock(); |
5c786ded JD |
5320 | } |
5321 | break; | |
5322 | } | |
5323 | case LTTNG_BUFFER_PER_PID: | |
5324 | { | |
5325 | rcu_read_lock(); | |
5326 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5327 | struct ust_app_channel *ua_chan; | |
5328 | struct ust_app_session *ua_sess; | |
5329 | struct lttng_ht_iter chan_iter; | |
5330 | ||
5331 | ua_sess = lookup_session_by_app(usess, app); | |
5332 | if (!ua_sess) { | |
5333 | /* Session not associated with this app. */ | |
5334 | continue; | |
5335 | } | |
5336 | ||
5337 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
5338 | ua_chan, node.node) { | |
135347bd MD |
5339 | if (cur_nr_packets >= ua_chan->attr.num_subbuf) { |
5340 | /* | |
5341 | * Don't take channel into account if we | |
5342 | * already grab all its packets. | |
5343 | */ | |
5344 | continue; | |
5345 | } | |
5346 | tot_size += ua_chan->attr.subbuf_size * ua_chan->streams.count; | |
5c786ded JD |
5347 | } |
5348 | } | |
5349 | rcu_read_unlock(); | |
5350 | break; | |
5351 | } | |
5352 | default: | |
5353 | assert(0); | |
5354 | break; | |
5355 | } | |
5356 | ||
135347bd | 5357 | return tot_size; |
5c786ded | 5358 | } |