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