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 | |
6c1c0768 | 19 | #define _LGPL_SOURCE |
91d76f53 | 20 | #include <errno.h> |
7972aab2 | 21 | #include <inttypes.h> |
91d76f53 DG |
22 | #include <pthread.h> |
23 | #include <stdio.h> | |
24 | #include <stdlib.h> | |
099e26bd | 25 | #include <string.h> |
aba8e916 DG |
26 | #include <sys/stat.h> |
27 | #include <sys/types.h> | |
099e26bd | 28 | #include <unistd.h> |
0df502fd | 29 | #include <urcu/compiler.h> |
fb54cdbf | 30 | #include <lttng/ust-error.h> |
331744e3 | 31 | #include <signal.h> |
bec39940 | 32 | |
990570ed | 33 | #include <common/common.h> |
86acf0da | 34 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 35 | |
7972aab2 | 36 | #include "buffer-registry.h" |
86acf0da | 37 | #include "fd-limit.h" |
8782cc74 | 38 | #include "health-sessiond.h" |
56fff090 | 39 | #include "ust-app.h" |
48842b30 | 40 | #include "ust-consumer.h" |
d80a6244 | 41 | #include "ust-ctl.h" |
0b2dc8df | 42 | #include "utils.h" |
d80a6244 | 43 | |
c4b88406 MD |
44 | static |
45 | int ust_app_flush_app_session(struct ust_app *app, struct ust_app_session *ua_sess); | |
46 | ||
d9bf3ca4 MD |
47 | /* Next available channel key. Access under next_channel_key_lock. */ |
48 | static uint64_t _next_channel_key; | |
49 | static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER; | |
50 | ||
51 | /* Next available session ID. Access under next_session_id_lock. */ | |
52 | static uint64_t _next_session_id; | |
53 | static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER; | |
ffe60014 DG |
54 | |
55 | /* | |
d9bf3ca4 | 56 | * Return the incremented value of next_channel_key. |
ffe60014 | 57 | */ |
d9bf3ca4 | 58 | static uint64_t get_next_channel_key(void) |
ffe60014 | 59 | { |
d9bf3ca4 MD |
60 | uint64_t ret; |
61 | ||
62 | pthread_mutex_lock(&next_channel_key_lock); | |
63 | ret = ++_next_channel_key; | |
64 | pthread_mutex_unlock(&next_channel_key_lock); | |
65 | return ret; | |
ffe60014 DG |
66 | } |
67 | ||
68 | /* | |
7972aab2 | 69 | * Return the atomically incremented value of next_session_id. |
ffe60014 | 70 | */ |
d9bf3ca4 | 71 | static uint64_t get_next_session_id(void) |
ffe60014 | 72 | { |
d9bf3ca4 MD |
73 | uint64_t ret; |
74 | ||
75 | pthread_mutex_lock(&next_session_id_lock); | |
76 | ret = ++_next_session_id; | |
77 | pthread_mutex_unlock(&next_session_id_lock); | |
78 | return ret; | |
ffe60014 DG |
79 | } |
80 | ||
d65d2de8 DG |
81 | static void copy_channel_attr_to_ustctl( |
82 | struct ustctl_consumer_channel_attr *attr, | |
83 | struct lttng_ust_channel_attr *uattr) | |
84 | { | |
85 | /* Copy event attributes since the layout is different. */ | |
86 | attr->subbuf_size = uattr->subbuf_size; | |
87 | attr->num_subbuf = uattr->num_subbuf; | |
88 | attr->overwrite = uattr->overwrite; | |
89 | attr->switch_timer_interval = uattr->switch_timer_interval; | |
90 | attr->read_timer_interval = uattr->read_timer_interval; | |
91 | attr->output = uattr->output; | |
92 | } | |
93 | ||
025faf73 DG |
94 | /* |
95 | * Match function for the hash table lookup. | |
96 | * | |
97 | * It matches an ust app event based on three attributes which are the event | |
98 | * name, the filter bytecode and the loglevel. | |
99 | */ | |
18eace3b DG |
100 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
101 | { | |
102 | struct ust_app_event *event; | |
103 | const struct ust_app_ht_key *key; | |
104 | ||
105 | assert(node); | |
106 | assert(_key); | |
107 | ||
108 | event = caa_container_of(node, struct ust_app_event, node.node); | |
109 | key = _key; | |
110 | ||
1af53eb5 | 111 | /* Match the 4 elements of the key: name, filter, loglevel, exclusions */ |
18eace3b DG |
112 | |
113 | /* Event name */ | |
114 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
115 | goto no_match; | |
116 | } | |
117 | ||
118 | /* Event loglevel. */ | |
119 | if (event->attr.loglevel != key->loglevel) { | |
025faf73 DG |
120 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
121 | && key->loglevel == 0 && event->attr.loglevel == -1) { | |
122 | /* | |
123 | * Match is accepted. This is because on event creation, the | |
124 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
125 | * -1 are accepted for this loglevel type since 0 is the one set by | |
126 | * the API when receiving an enable event. | |
127 | */ | |
128 | } else { | |
129 | goto no_match; | |
130 | } | |
18eace3b DG |
131 | } |
132 | ||
133 | /* One of the filters is NULL, fail. */ | |
134 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
135 | goto no_match; | |
136 | } | |
137 | ||
025faf73 DG |
138 | if (key->filter && event->filter) { |
139 | /* Both filters exists, check length followed by the bytecode. */ | |
140 | if (event->filter->len != key->filter->len || | |
141 | memcmp(event->filter->data, key->filter->data, | |
142 | event->filter->len) != 0) { | |
143 | goto no_match; | |
144 | } | |
18eace3b DG |
145 | } |
146 | ||
1af53eb5 JI |
147 | /* One of the exclusions is NULL, fail. */ |
148 | if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) { | |
149 | goto no_match; | |
150 | } | |
151 | ||
152 | if (key->exclusion && event->exclusion) { | |
153 | /* Both exclusions exists, check count followed by the names. */ | |
154 | if (event->exclusion->count != key->exclusion->count || | |
155 | memcmp(event->exclusion->names, key->exclusion->names, | |
156 | event->exclusion->count * LTTNG_UST_SYM_NAME_LEN) != 0) { | |
157 | goto no_match; | |
158 | } | |
159 | } | |
160 | ||
161 | ||
025faf73 | 162 | /* Match. */ |
18eace3b DG |
163 | return 1; |
164 | ||
165 | no_match: | |
166 | return 0; | |
18eace3b DG |
167 | } |
168 | ||
025faf73 DG |
169 | /* |
170 | * Unique add of an ust app event in the given ht. This uses the custom | |
171 | * ht_match_ust_app_event match function and the event name as hash. | |
172 | */ | |
d0b96690 | 173 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
174 | struct ust_app_event *event) |
175 | { | |
176 | struct cds_lfht_node *node_ptr; | |
177 | struct ust_app_ht_key key; | |
d0b96690 | 178 | struct lttng_ht *ht; |
18eace3b | 179 | |
d0b96690 DG |
180 | assert(ua_chan); |
181 | assert(ua_chan->events); | |
18eace3b DG |
182 | assert(event); |
183 | ||
d0b96690 | 184 | ht = ua_chan->events; |
18eace3b DG |
185 | key.name = event->attr.name; |
186 | key.filter = event->filter; | |
187 | key.loglevel = event->attr.loglevel; | |
91c89f23 | 188 | key.exclusion = event->exclusion; |
18eace3b DG |
189 | |
190 | node_ptr = cds_lfht_add_unique(ht->ht, | |
191 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
192 | ht_match_ust_app_event, &key, &event->node.node); | |
193 | assert(node_ptr == &event->node.node); | |
194 | } | |
195 | ||
d88aee68 DG |
196 | /* |
197 | * Close the notify socket from the given RCU head object. This MUST be called | |
198 | * through a call_rcu(). | |
199 | */ | |
200 | static void close_notify_sock_rcu(struct rcu_head *head) | |
201 | { | |
202 | int ret; | |
203 | struct ust_app_notify_sock_obj *obj = | |
204 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
205 | ||
206 | /* Must have a valid fd here. */ | |
207 | assert(obj->fd >= 0); | |
208 | ||
209 | ret = close(obj->fd); | |
210 | if (ret) { | |
211 | ERR("close notify sock %d RCU", obj->fd); | |
212 | } | |
213 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
214 | ||
215 | free(obj); | |
216 | } | |
217 | ||
7972aab2 DG |
218 | /* |
219 | * Return the session registry according to the buffer type of the given | |
220 | * session. | |
221 | * | |
222 | * A registry per UID object MUST exists before calling this function or else | |
223 | * it assert() if not found. RCU read side lock must be acquired. | |
224 | */ | |
225 | static struct ust_registry_session *get_session_registry( | |
226 | struct ust_app_session *ua_sess) | |
227 | { | |
228 | struct ust_registry_session *registry = NULL; | |
229 | ||
230 | assert(ua_sess); | |
231 | ||
232 | switch (ua_sess->buffer_type) { | |
233 | case LTTNG_BUFFER_PER_PID: | |
234 | { | |
235 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
236 | if (!reg_pid) { | |
237 | goto error; | |
238 | } | |
239 | registry = reg_pid->registry->reg.ust; | |
240 | break; | |
241 | } | |
242 | case LTTNG_BUFFER_PER_UID: | |
243 | { | |
244 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
245 | ua_sess->tracing_id, ua_sess->bits_per_long, ua_sess->uid); | |
246 | if (!reg_uid) { | |
247 | goto error; | |
248 | } | |
249 | registry = reg_uid->registry->reg.ust; | |
250 | break; | |
251 | } | |
252 | default: | |
253 | assert(0); | |
254 | }; | |
255 | ||
256 | error: | |
257 | return registry; | |
258 | } | |
259 | ||
55cc08a6 DG |
260 | /* |
261 | * Delete ust context safely. RCU read lock must be held before calling | |
262 | * this function. | |
263 | */ | |
264 | static | |
265 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx) | |
266 | { | |
ffe60014 DG |
267 | int ret; |
268 | ||
269 | assert(ua_ctx); | |
270 | ||
55cc08a6 | 271 | if (ua_ctx->obj) { |
ffe60014 | 272 | ret = ustctl_release_object(sock, ua_ctx->obj); |
d0b96690 DG |
273 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
274 | ERR("UST app sock %d release ctx obj handle %d failed with ret %d", | |
275 | sock, ua_ctx->obj->handle, ret); | |
ffe60014 | 276 | } |
55cc08a6 DG |
277 | free(ua_ctx->obj); |
278 | } | |
279 | free(ua_ctx); | |
280 | } | |
281 | ||
d80a6244 DG |
282 | /* |
283 | * Delete ust app event safely. RCU read lock must be held before calling | |
284 | * this function. | |
285 | */ | |
8b366481 DG |
286 | static |
287 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event) | |
d80a6244 | 288 | { |
ffe60014 DG |
289 | int ret; |
290 | ||
291 | assert(ua_event); | |
292 | ||
53a80697 | 293 | free(ua_event->filter); |
951f0b71 JI |
294 | if (ua_event->exclusion != NULL) |
295 | free(ua_event->exclusion); | |
edb67388 | 296 | if (ua_event->obj != NULL) { |
ffe60014 DG |
297 | ret = ustctl_release_object(sock, ua_event->obj); |
298 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
299 | ERR("UST app sock %d release event obj failed with ret %d", | |
300 | sock, ret); | |
301 | } | |
edb67388 DG |
302 | free(ua_event->obj); |
303 | } | |
d80a6244 DG |
304 | free(ua_event); |
305 | } | |
306 | ||
307 | /* | |
7972aab2 DG |
308 | * Release ust data object of the given stream. |
309 | * | |
310 | * Return 0 on success or else a negative value. | |
d80a6244 | 311 | */ |
7972aab2 | 312 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream) |
d80a6244 | 313 | { |
7972aab2 | 314 | int ret = 0; |
ffe60014 DG |
315 | |
316 | assert(stream); | |
317 | ||
8b366481 | 318 | if (stream->obj) { |
ffe60014 DG |
319 | ret = ustctl_release_object(sock, stream->obj); |
320 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
321 | ERR("UST app sock %d release stream obj failed with ret %d", | |
322 | sock, ret); | |
323 | } | |
4063050c | 324 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
325 | free(stream->obj); |
326 | } | |
7972aab2 DG |
327 | |
328 | return ret; | |
329 | } | |
330 | ||
331 | /* | |
332 | * Delete ust app stream safely. RCU read lock must be held before calling | |
333 | * this function. | |
334 | */ | |
335 | static | |
336 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream) | |
337 | { | |
338 | assert(stream); | |
339 | ||
340 | (void) release_ust_app_stream(sock, stream); | |
84cd17c6 | 341 | free(stream); |
d80a6244 DG |
342 | } |
343 | ||
36b588ed MD |
344 | /* |
345 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
346 | * section and outside of call_rcu thread, so we postpone its execution |
347 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
348 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
349 | */ |
350 | static | |
351 | void delete_ust_app_channel_rcu(struct rcu_head *head) | |
352 | { | |
353 | struct ust_app_channel *ua_chan = | |
354 | caa_container_of(head, struct ust_app_channel, rcu_head); | |
355 | ||
0b2dc8df MD |
356 | ht_cleanup_push(ua_chan->ctx); |
357 | ht_cleanup_push(ua_chan->events); | |
36b588ed MD |
358 | free(ua_chan); |
359 | } | |
360 | ||
d80a6244 DG |
361 | /* |
362 | * Delete ust app channel safely. RCU read lock must be held before calling | |
363 | * this function. | |
364 | */ | |
8b366481 | 365 | static |
d0b96690 DG |
366 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
367 | struct ust_app *app) | |
d80a6244 DG |
368 | { |
369 | int ret; | |
bec39940 | 370 | struct lttng_ht_iter iter; |
d80a6244 | 371 | struct ust_app_event *ua_event; |
55cc08a6 | 372 | struct ust_app_ctx *ua_ctx; |
030a66fa | 373 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 374 | struct ust_registry_session *registry; |
d80a6244 | 375 | |
ffe60014 DG |
376 | assert(ua_chan); |
377 | ||
378 | DBG3("UST app deleting channel %s", ua_chan->name); | |
379 | ||
55cc08a6 | 380 | /* Wipe stream */ |
d80a6244 | 381 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 382 | cds_list_del(&stream->list); |
d80a6244 DG |
383 | delete_ust_app_stream(sock, stream); |
384 | } | |
385 | ||
55cc08a6 | 386 | /* Wipe context */ |
bec39940 | 387 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
31746f93 | 388 | cds_list_del(&ua_ctx->list); |
bec39940 | 389 | ret = lttng_ht_del(ua_chan->ctx, &iter); |
55cc08a6 DG |
390 | assert(!ret); |
391 | delete_ust_app_ctx(sock, ua_ctx); | |
392 | } | |
d80a6244 | 393 | |
55cc08a6 | 394 | /* Wipe events */ |
bec39940 DG |
395 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
396 | node.node) { | |
397 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 398 | assert(!ret); |
d80a6244 DG |
399 | delete_ust_app_event(sock, ua_event); |
400 | } | |
edb67388 | 401 | |
c8335706 MD |
402 | if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) { |
403 | /* Wipe and free registry from session registry. */ | |
404 | registry = get_session_registry(ua_chan->session); | |
405 | if (registry) { | |
406 | ust_registry_channel_del_free(registry, ua_chan->key); | |
407 | } | |
7972aab2 | 408 | } |
d0b96690 | 409 | |
edb67388 | 410 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
411 | /* Remove channel from application UST object descriptor. */ |
412 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
c6e62271 DG |
413 | ret = lttng_ht_del(app->ust_objd, &iter); |
414 | assert(!ret); | |
ffe60014 DG |
415 | ret = ustctl_release_object(sock, ua_chan->obj); |
416 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
417 | ERR("UST app sock %d release channel obj failed with ret %d", | |
418 | sock, ret); | |
419 | } | |
7972aab2 | 420 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
421 | free(ua_chan->obj); |
422 | } | |
36b588ed | 423 | call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); |
d80a6244 DG |
424 | } |
425 | ||
331744e3 | 426 | /* |
1b532a60 DG |
427 | * Push metadata to consumer socket. |
428 | * | |
dc2bbdae MD |
429 | * RCU read-side lock must be held to guarantee existance of socket. |
430 | * Must be called with the ust app session lock held. | |
431 | * Must be called with the registry lock held. | |
331744e3 JD |
432 | * |
433 | * On success, return the len of metadata pushed or else a negative value. | |
2c57e06d MD |
434 | * Returning a -EPIPE return value means we could not send the metadata, |
435 | * but it can be caused by recoverable errors (e.g. the application has | |
436 | * terminated concurrently). | |
331744e3 JD |
437 | */ |
438 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
439 | struct consumer_socket *socket, int send_zero_data) | |
440 | { | |
441 | int ret; | |
442 | char *metadata_str = NULL; | |
443 | size_t len, offset; | |
444 | ssize_t ret_val; | |
445 | ||
446 | assert(registry); | |
447 | assert(socket); | |
1b532a60 | 448 | |
ce34fcd0 | 449 | /* |
dc2bbdae MD |
450 | * Means that no metadata was assigned to the session. This can |
451 | * happens if no start has been done previously. | |
ce34fcd0 MD |
452 | */ |
453 | if (!registry->metadata_key) { | |
ce34fcd0 MD |
454 | return 0; |
455 | } | |
456 | ||
1b532a60 | 457 | /* |
dc2bbdae MD |
458 | * On a push metadata error either the consumer is dead or the |
459 | * metadata channel has been destroyed because its endpoint | |
2c57e06d MD |
460 | * might have died (e.g: relayd), or because the application has |
461 | * exited. If so, the metadata closed flag is set to 1 so we | |
462 | * deny pushing metadata again which is not valid anymore on the | |
463 | * consumer side. | |
1b532a60 DG |
464 | */ |
465 | if (registry->metadata_closed) { | |
466 | return -EPIPE; | |
467 | } | |
331744e3 | 468 | |
331744e3 JD |
469 | offset = registry->metadata_len_sent; |
470 | len = registry->metadata_len - registry->metadata_len_sent; | |
471 | if (len == 0) { | |
472 | DBG3("No metadata to push for metadata key %" PRIu64, | |
473 | registry->metadata_key); | |
474 | ret_val = len; | |
475 | if (send_zero_data) { | |
476 | DBG("No metadata to push"); | |
477 | goto push_data; | |
478 | } | |
479 | goto end; | |
480 | } | |
481 | ||
482 | /* Allocate only what we have to send. */ | |
483 | metadata_str = zmalloc(len); | |
484 | if (!metadata_str) { | |
485 | PERROR("zmalloc ust app metadata string"); | |
486 | ret_val = -ENOMEM; | |
487 | goto error; | |
488 | } | |
489 | /* Copy what we haven't send out. */ | |
490 | memcpy(metadata_str, registry->metadata + offset, len); | |
491 | registry->metadata_len_sent += len; | |
492 | ||
493 | push_data: | |
331744e3 JD |
494 | ret = consumer_push_metadata(socket, registry->metadata_key, |
495 | metadata_str, len, offset); | |
496 | if (ret < 0) { | |
000baf6a | 497 | /* |
dc2bbdae MD |
498 | * There is an acceptable race here between the registry |
499 | * metadata key assignment and the creation on the | |
500 | * consumer. The session daemon can concurrently push | |
501 | * metadata for this registry while being created on the | |
502 | * consumer since the metadata key of the registry is | |
503 | * assigned *before* it is setup to avoid the consumer | |
504 | * to ask for metadata that could possibly be not found | |
505 | * in the session daemon. | |
000baf6a | 506 | * |
dc2bbdae MD |
507 | * The metadata will get pushed either by the session |
508 | * being stopped or the consumer requesting metadata if | |
509 | * that race is triggered. | |
000baf6a DG |
510 | */ |
511 | if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) { | |
512 | ret = 0; | |
513 | } | |
ffa3f245 | 514 | |
dc2bbdae MD |
515 | /* |
516 | * Update back the actual metadata len sent since it | |
517 | * failed here. | |
518 | */ | |
ffa3f245 | 519 | registry->metadata_len_sent -= len; |
331744e3 JD |
520 | ret_val = ret; |
521 | goto error_push; | |
522 | } | |
523 | ||
524 | free(metadata_str); | |
525 | return len; | |
526 | ||
527 | end: | |
528 | error: | |
ce34fcd0 MD |
529 | if (ret_val) { |
530 | /* | |
dc2bbdae MD |
531 | * On error, flag the registry that the metadata is |
532 | * closed. We were unable to push anything and this | |
533 | * means that either the consumer is not responding or | |
534 | * the metadata cache has been destroyed on the | |
535 | * consumer. | |
ce34fcd0 MD |
536 | */ |
537 | registry->metadata_closed = 1; | |
538 | } | |
331744e3 JD |
539 | error_push: |
540 | free(metadata_str); | |
541 | return ret_val; | |
542 | } | |
543 | ||
d88aee68 | 544 | /* |
ce34fcd0 | 545 | * For a given application and session, push metadata to consumer. |
331744e3 JD |
546 | * Either sock or consumer is required : if sock is NULL, the default |
547 | * socket to send the metadata is retrieved from consumer, if sock | |
548 | * is not NULL we use it to send the metadata. | |
ce34fcd0 | 549 | * RCU read-side lock must be held while calling this function, |
dc2bbdae MD |
550 | * therefore ensuring existance of registry. It also ensures existance |
551 | * of socket throughout this function. | |
d88aee68 DG |
552 | * |
553 | * Return 0 on success else a negative error. | |
2c57e06d MD |
554 | * Returning a -EPIPE return value means we could not send the metadata, |
555 | * but it can be caused by recoverable errors (e.g. the application has | |
556 | * terminated concurrently). | |
d88aee68 | 557 | */ |
7972aab2 DG |
558 | static int push_metadata(struct ust_registry_session *registry, |
559 | struct consumer_output *consumer) | |
d88aee68 | 560 | { |
331744e3 JD |
561 | int ret_val; |
562 | ssize_t ret; | |
d88aee68 DG |
563 | struct consumer_socket *socket; |
564 | ||
7972aab2 DG |
565 | assert(registry); |
566 | assert(consumer); | |
567 | ||
ce34fcd0 | 568 | pthread_mutex_lock(®istry->lock); |
ce34fcd0 | 569 | if (registry->metadata_closed) { |
dc2bbdae MD |
570 | ret_val = -EPIPE; |
571 | goto error; | |
d88aee68 DG |
572 | } |
573 | ||
d88aee68 | 574 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
575 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
576 | consumer); | |
d88aee68 | 577 | if (!socket) { |
331744e3 | 578 | ret_val = -1; |
ce34fcd0 | 579 | goto error; |
d88aee68 DG |
580 | } |
581 | ||
331744e3 | 582 | ret = ust_app_push_metadata(registry, socket, 0); |
d88aee68 | 583 | if (ret < 0) { |
331744e3 | 584 | ret_val = ret; |
ce34fcd0 | 585 | goto error; |
d88aee68 | 586 | } |
dc2bbdae | 587 | pthread_mutex_unlock(®istry->lock); |
d88aee68 DG |
588 | return 0; |
589 | ||
ce34fcd0 | 590 | error: |
dc2bbdae | 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 | |
dc2bbdae | 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 | ||
ce34fcd0 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: | |
ce34fcd0 | 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); |
ce34fcd0 | 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 | */ |
ce34fcd0 | 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 */ |
40113787 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 | } | |
8535a6d9 DG |
1481 | } |
1482 | ||
5b4a0ec0 | 1483 | error: |
840cb59c | 1484 | health_code_update(); |
5b4a0ec0 | 1485 | return ret; |
91d76f53 | 1486 | } |
48842b30 | 1487 | |
5b4a0ec0 DG |
1488 | /* |
1489 | * Copy data between an UST app event and a LTT event. | |
1490 | */ | |
421cb601 | 1491 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1492 | struct ltt_ust_event *uevent) |
1493 | { | |
b4ffad32 JI |
1494 | size_t exclusion_alloc_size; |
1495 | ||
48842b30 DG |
1496 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); |
1497 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1498 | ||
fc34caaa DG |
1499 | ua_event->enabled = uevent->enabled; |
1500 | ||
5b4a0ec0 DG |
1501 | /* Copy event attributes */ |
1502 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1503 | ||
53a80697 MD |
1504 | /* Copy filter bytecode */ |
1505 | if (uevent->filter) { | |
025faf73 DG |
1506 | ua_event->filter = alloc_copy_ust_app_filter(uevent->filter); |
1507 | /* Filter might be NULL here in case of ENONEM. */ | |
53a80697 | 1508 | } |
b4ffad32 JI |
1509 | |
1510 | /* Copy exclusion data */ | |
1511 | if (uevent->exclusion) { | |
1512 | exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) + | |
1513 | LTTNG_UST_SYM_NAME_LEN * uevent->exclusion->count; | |
1514 | ua_event->exclusion = zmalloc(exclusion_alloc_size); | |
5f8df26c JI |
1515 | if (ua_event->exclusion == NULL) { |
1516 | PERROR("malloc"); | |
1517 | } else { | |
1518 | memcpy(ua_event->exclusion, uevent->exclusion, | |
1519 | exclusion_alloc_size); | |
b4ffad32 JI |
1520 | } |
1521 | } | |
48842b30 DG |
1522 | } |
1523 | ||
5b4a0ec0 DG |
1524 | /* |
1525 | * Copy data between an UST app channel and a LTT channel. | |
1526 | */ | |
421cb601 | 1527 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1528 | struct ltt_ust_channel *uchan) |
1529 | { | |
bec39940 | 1530 | struct lttng_ht_iter iter; |
48842b30 | 1531 | struct ltt_ust_event *uevent; |
55cc08a6 | 1532 | struct ltt_ust_context *uctx; |
48842b30 | 1533 | struct ust_app_event *ua_event; |
55cc08a6 | 1534 | struct ust_app_ctx *ua_ctx; |
48842b30 | 1535 | |
fc34caaa | 1536 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1537 | |
1538 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1539 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 1540 | |
1624d5b7 JD |
1541 | ua_chan->tracefile_size = uchan->tracefile_size; |
1542 | ua_chan->tracefile_count = uchan->tracefile_count; | |
1543 | ||
ffe60014 DG |
1544 | /* Copy event attributes since the layout is different. */ |
1545 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1546 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1547 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1548 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1549 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
1550 | ua_chan->attr.output = uchan->attr.output; | |
1551 | /* | |
1552 | * Note that the attribute channel type is not set since the channel on the | |
1553 | * tracing registry side does not have this information. | |
1554 | */ | |
48842b30 | 1555 | |
fc34caaa | 1556 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1557 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1558 | |
31746f93 | 1559 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { |
55cc08a6 DG |
1560 | ua_ctx = alloc_ust_app_ctx(&uctx->ctx); |
1561 | if (ua_ctx == NULL) { | |
1562 | continue; | |
1563 | } | |
bec39940 DG |
1564 | lttng_ht_node_init_ulong(&ua_ctx->node, |
1565 | (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 1566 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 1567 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
55cc08a6 | 1568 | } |
48842b30 | 1569 | |
421cb601 | 1570 | /* Copy all events from ltt ust channel to ust app channel */ |
bec39940 | 1571 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
18eace3b | 1572 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 1573 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 1574 | if (ua_event == NULL) { |
421cb601 | 1575 | DBG2("UST event %s not found on shadow copy channel", |
48842b30 | 1576 | uevent->attr.name); |
284d8f55 | 1577 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
48842b30 | 1578 | if (ua_event == NULL) { |
5b4a0ec0 | 1579 | continue; |
48842b30 | 1580 | } |
421cb601 | 1581 | shadow_copy_event(ua_event, uevent); |
d0b96690 | 1582 | add_unique_ust_app_event(ua_chan, ua_event); |
48842b30 | 1583 | } |
48842b30 DG |
1584 | } |
1585 | ||
fc34caaa | 1586 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1587 | } |
1588 | ||
5b4a0ec0 DG |
1589 | /* |
1590 | * Copy data between a UST app session and a regular LTT session. | |
1591 | */ | |
421cb601 | 1592 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1593 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1594 | { |
bec39940 DG |
1595 | struct lttng_ht_node_str *ua_chan_node; |
1596 | struct lttng_ht_iter iter; | |
48842b30 DG |
1597 | struct ltt_ust_channel *uchan; |
1598 | struct ust_app_channel *ua_chan; | |
477d7741 MD |
1599 | time_t rawtime; |
1600 | struct tm *timeinfo; | |
1601 | char datetime[16]; | |
1602 | int ret; | |
d7ba1388 | 1603 | char tmp_shm_path[PATH_MAX]; |
477d7741 MD |
1604 | |
1605 | /* Get date and time for unique app path */ | |
1606 | time(&rawtime); | |
1607 | timeinfo = localtime(&rawtime); | |
1608 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1609 | |
421cb601 | 1610 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1611 | |
7972aab2 DG |
1612 | ua_sess->tracing_id = usess->id; |
1613 | ua_sess->id = get_next_session_id(); | |
1614 | ua_sess->uid = app->uid; | |
1615 | ua_sess->gid = app->gid; | |
1616 | ua_sess->euid = usess->uid; | |
1617 | ua_sess->egid = usess->gid; | |
1618 | ua_sess->buffer_type = usess->buffer_type; | |
1619 | ua_sess->bits_per_long = app->bits_per_long; | |
1620 | /* There is only one consumer object per session possible. */ | |
1621 | ua_sess->consumer = usess->consumer; | |
2bba9e53 | 1622 | ua_sess->output_traces = usess->output_traces; |
ecc48a90 | 1623 | ua_sess->live_timer_interval = usess->live_timer_interval; |
84ad93e8 DG |
1624 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, |
1625 | &usess->metadata_attr); | |
7972aab2 DG |
1626 | |
1627 | switch (ua_sess->buffer_type) { | |
1628 | case LTTNG_BUFFER_PER_PID: | |
1629 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 1630 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
1631 | datetime); |
1632 | break; | |
1633 | case LTTNG_BUFFER_PER_UID: | |
1634 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1635 | DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long); | |
1636 | break; | |
1637 | default: | |
1638 | assert(0); | |
1639 | goto error; | |
1640 | } | |
477d7741 MD |
1641 | if (ret < 0) { |
1642 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1643 | assert(0); |
7972aab2 | 1644 | goto error; |
477d7741 MD |
1645 | } |
1646 | ||
3d071855 MD |
1647 | strncpy(ua_sess->root_shm_path, usess->root_shm_path, |
1648 | sizeof(ua_sess->root_shm_path)); | |
1649 | ua_sess->root_shm_path[sizeof(ua_sess->root_shm_path) - 1] = '\0'; | |
d7ba1388 MD |
1650 | strncpy(ua_sess->shm_path, usess->shm_path, |
1651 | sizeof(ua_sess->shm_path)); | |
1652 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
1653 | if (ua_sess->shm_path[0]) { | |
1654 | switch (ua_sess->buffer_type) { | |
1655 | case LTTNG_BUFFER_PER_PID: | |
1656 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
1657 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", | |
1658 | app->name, app->pid, datetime); | |
1659 | break; | |
1660 | case LTTNG_BUFFER_PER_UID: | |
1661 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
1662 | DEFAULT_UST_TRACE_UID_PATH, | |
1663 | app->uid, app->bits_per_long); | |
1664 | break; | |
1665 | default: | |
1666 | assert(0); | |
1667 | goto error; | |
1668 | } | |
1669 | if (ret < 0) { | |
1670 | PERROR("sprintf UST shadow copy session"); | |
1671 | assert(0); | |
1672 | goto error; | |
1673 | } | |
1674 | strncat(ua_sess->shm_path, tmp_shm_path, | |
1675 | sizeof(ua_sess->shm_path) - strlen(ua_sess->shm_path) - 1); | |
1676 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
1677 | } | |
1678 | ||
48842b30 | 1679 | /* Iterate over all channels in global domain. */ |
bec39940 DG |
1680 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, |
1681 | uchan, node.node) { | |
1682 | struct lttng_ht_iter uiter; | |
ba767faf | 1683 | |
bec39940 DG |
1684 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
1685 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
5b4a0ec0 | 1686 | if (ua_chan_node != NULL) { |
fc34caaa | 1687 | /* Session exist. Contiuing. */ |
5b4a0ec0 DG |
1688 | continue; |
1689 | } | |
421cb601 | 1690 | |
5b4a0ec0 DG |
1691 | DBG2("Channel %s not found on shadow session copy, creating it", |
1692 | uchan->name); | |
d0b96690 | 1693 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
5b4a0ec0 | 1694 | if (ua_chan == NULL) { |
fc34caaa | 1695 | /* malloc failed FIXME: Might want to do handle ENOMEM .. */ |
5b4a0ec0 | 1696 | continue; |
48842b30 | 1697 | } |
5b4a0ec0 | 1698 | shadow_copy_channel(ua_chan, uchan); |
ffe60014 DG |
1699 | /* |
1700 | * The concept of metadata channel does not exist on the tracing | |
1701 | * registry side of the session daemon so this can only be a per CPU | |
1702 | * channel and not metadata. | |
1703 | */ | |
1704 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
1705 | ||
bec39940 | 1706 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); |
48842b30 | 1707 | } |
7972aab2 DG |
1708 | |
1709 | error: | |
1710 | return; | |
48842b30 DG |
1711 | } |
1712 | ||
78f0bacd DG |
1713 | /* |
1714 | * Lookup sesison wrapper. | |
1715 | */ | |
84cd17c6 MD |
1716 | static |
1717 | void __lookup_session_by_app(struct ltt_ust_session *usess, | |
bec39940 | 1718 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1719 | { |
1720 | /* Get right UST app session from app */ | |
d9bf3ca4 | 1721 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
1722 | } |
1723 | ||
421cb601 DG |
1724 | /* |
1725 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1726 | * id. |
421cb601 | 1727 | */ |
48842b30 DG |
1728 | static struct ust_app_session *lookup_session_by_app( |
1729 | struct ltt_ust_session *usess, struct ust_app *app) | |
1730 | { | |
bec39940 | 1731 | struct lttng_ht_iter iter; |
d9bf3ca4 | 1732 | struct lttng_ht_node_u64 *node; |
48842b30 | 1733 | |
84cd17c6 | 1734 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 1735 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
1736 | if (node == NULL) { |
1737 | goto error; | |
1738 | } | |
1739 | ||
1740 | return caa_container_of(node, struct ust_app_session, node); | |
1741 | ||
1742 | error: | |
1743 | return NULL; | |
1744 | } | |
1745 | ||
7972aab2 DG |
1746 | /* |
1747 | * Setup buffer registry per PID for the given session and application. If none | |
1748 | * is found, a new one is created, added to the global registry and | |
1749 | * initialized. If regp is valid, it's set with the newly created object. | |
1750 | * | |
1751 | * Return 0 on success or else a negative value. | |
1752 | */ | |
1753 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
1754 | struct ust_app *app, struct buffer_reg_pid **regp) | |
1755 | { | |
1756 | int ret = 0; | |
1757 | struct buffer_reg_pid *reg_pid; | |
1758 | ||
1759 | assert(ua_sess); | |
1760 | assert(app); | |
1761 | ||
1762 | rcu_read_lock(); | |
1763 | ||
1764 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
1765 | if (!reg_pid) { | |
1766 | /* | |
1767 | * This is the create channel path meaning that if there is NO | |
1768 | * registry available, we have to create one for this session. | |
1769 | */ | |
d7ba1388 | 1770 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid, |
3d071855 | 1771 | ua_sess->root_shm_path, ua_sess->shm_path); |
7972aab2 DG |
1772 | if (ret < 0) { |
1773 | goto error; | |
1774 | } | |
7972aab2 DG |
1775 | } else { |
1776 | goto end; | |
1777 | } | |
1778 | ||
1779 | /* Initialize registry. */ | |
1780 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
1781 | app->bits_per_long, app->uint8_t_alignment, | |
1782 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1783 | app->uint64_t_alignment, app->long_alignment, |
1784 | app->byte_order, app->version.major, | |
3d071855 MD |
1785 | app->version.minor, reg_pid->root_shm_path, |
1786 | reg_pid->shm_path, | |
d7ba1388 | 1787 | ua_sess->euid, ua_sess->egid); |
7972aab2 | 1788 | if (ret < 0) { |
286c991a MD |
1789 | /* |
1790 | * reg_pid->registry->reg.ust is NULL upon error, so we need to | |
1791 | * destroy the buffer registry, because it is always expected | |
1792 | * that if the buffer registry can be found, its ust registry is | |
1793 | * non-NULL. | |
1794 | */ | |
1795 | buffer_reg_pid_destroy(reg_pid); | |
7972aab2 DG |
1796 | goto error; |
1797 | } | |
1798 | ||
286c991a MD |
1799 | buffer_reg_pid_add(reg_pid); |
1800 | ||
7972aab2 DG |
1801 | DBG3("UST app buffer registry per PID created successfully"); |
1802 | ||
1803 | end: | |
1804 | if (regp) { | |
1805 | *regp = reg_pid; | |
1806 | } | |
1807 | error: | |
1808 | rcu_read_unlock(); | |
1809 | return ret; | |
1810 | } | |
1811 | ||
1812 | /* | |
1813 | * Setup buffer registry per UID for the given session and application. If none | |
1814 | * is found, a new one is created, added to the global registry and | |
1815 | * initialized. If regp is valid, it's set with the newly created object. | |
1816 | * | |
1817 | * Return 0 on success or else a negative value. | |
1818 | */ | |
1819 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
d7ba1388 | 1820 | struct ust_app_session *ua_sess, |
7972aab2 DG |
1821 | struct ust_app *app, struct buffer_reg_uid **regp) |
1822 | { | |
1823 | int ret = 0; | |
1824 | struct buffer_reg_uid *reg_uid; | |
1825 | ||
1826 | assert(usess); | |
1827 | assert(app); | |
1828 | ||
1829 | rcu_read_lock(); | |
1830 | ||
1831 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
1832 | if (!reg_uid) { | |
1833 | /* | |
1834 | * This is the create channel path meaning that if there is NO | |
1835 | * registry available, we have to create one for this session. | |
1836 | */ | |
1837 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
3d071855 MD |
1838 | LTTNG_DOMAIN_UST, ®_uid, |
1839 | ua_sess->root_shm_path, ua_sess->shm_path); | |
7972aab2 DG |
1840 | if (ret < 0) { |
1841 | goto error; | |
1842 | } | |
7972aab2 DG |
1843 | } else { |
1844 | goto end; | |
1845 | } | |
1846 | ||
1847 | /* Initialize registry. */ | |
af6142cf | 1848 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
1849 | app->bits_per_long, app->uint8_t_alignment, |
1850 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1851 | app->uint64_t_alignment, app->long_alignment, |
1852 | app->byte_order, app->version.major, | |
3d071855 MD |
1853 | app->version.minor, reg_uid->root_shm_path, |
1854 | reg_uid->shm_path, usess->uid, usess->gid); | |
7972aab2 | 1855 | if (ret < 0) { |
286c991a MD |
1856 | /* |
1857 | * reg_uid->registry->reg.ust is NULL upon error, so we need to | |
1858 | * destroy the buffer registry, because it is always expected | |
1859 | * that if the buffer registry can be found, its ust registry is | |
1860 | * non-NULL. | |
1861 | */ | |
1862 | buffer_reg_uid_destroy(reg_uid, NULL); | |
7972aab2 DG |
1863 | goto error; |
1864 | } | |
1865 | /* Add node to teardown list of the session. */ | |
1866 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
1867 | ||
286c991a | 1868 | buffer_reg_uid_add(reg_uid); |
7972aab2 | 1869 | |
286c991a | 1870 | DBG3("UST app buffer registry per UID created successfully"); |
7972aab2 DG |
1871 | end: |
1872 | if (regp) { | |
1873 | *regp = reg_uid; | |
1874 | } | |
1875 | error: | |
1876 | rcu_read_unlock(); | |
1877 | return ret; | |
1878 | } | |
1879 | ||
421cb601 | 1880 | /* |
3d8ca23b | 1881 | * Create a session on the tracer side for the given app. |
421cb601 | 1882 | * |
3d8ca23b DG |
1883 | * On success, ua_sess_ptr is populated with the session pointer or else left |
1884 | * untouched. If the session was created, is_created is set to 1. On error, | |
1885 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
1886 | * be NULL. | |
1887 | * | |
1888 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
1889 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 1890 | */ |
3d8ca23b DG |
1891 | static int create_ust_app_session(struct ltt_ust_session *usess, |
1892 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, | |
1893 | int *is_created) | |
421cb601 | 1894 | { |
3d8ca23b | 1895 | int ret, created = 0; |
421cb601 DG |
1896 | struct ust_app_session *ua_sess; |
1897 | ||
3d8ca23b DG |
1898 | assert(usess); |
1899 | assert(app); | |
1900 | assert(ua_sess_ptr); | |
1901 | ||
840cb59c | 1902 | health_code_update(); |
86acf0da | 1903 | |
421cb601 DG |
1904 | ua_sess = lookup_session_by_app(usess, app); |
1905 | if (ua_sess == NULL) { | |
d9bf3ca4 | 1906 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 1907 | app->pid, usess->id); |
d0b96690 | 1908 | ua_sess = alloc_ust_app_session(app); |
421cb601 DG |
1909 | if (ua_sess == NULL) { |
1910 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
1911 | ret = -ENOMEM; |
1912 | goto error; | |
421cb601 | 1913 | } |
477d7741 | 1914 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 1915 | created = 1; |
421cb601 DG |
1916 | } |
1917 | ||
7972aab2 DG |
1918 | switch (usess->buffer_type) { |
1919 | case LTTNG_BUFFER_PER_PID: | |
1920 | /* Init local registry. */ | |
1921 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 1922 | if (ret < 0) { |
e64207cf | 1923 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
1924 | goto error; |
1925 | } | |
1926 | break; | |
1927 | case LTTNG_BUFFER_PER_UID: | |
1928 | /* Look for a global registry. If none exists, create one. */ | |
d7ba1388 | 1929 | ret = setup_buffer_reg_uid(usess, ua_sess, app, NULL); |
7972aab2 | 1930 | if (ret < 0) { |
e64207cf | 1931 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
1932 | goto error; |
1933 | } | |
1934 | break; | |
1935 | default: | |
1936 | assert(0); | |
1937 | ret = -EINVAL; | |
1938 | goto error; | |
1939 | } | |
1940 | ||
1941 | health_code_update(); | |
1942 | ||
1943 | if (ua_sess->handle == -1) { | |
1944 | ret = ustctl_create_session(app->sock); | |
1945 | if (ret < 0) { | |
1946 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1947 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
1948 | app->pid, ret); |
1949 | } else { | |
1950 | DBG("UST app creating session failed. Application is dead"); | |
3757b385 DG |
1951 | /* |
1952 | * This is normal behavior, an application can die during the | |
1953 | * creation process. Don't report an error so the execution can | |
1954 | * continue normally. This will get flagged ENOTCONN and the | |
1955 | * caller will handle it. | |
1956 | */ | |
1957 | ret = 0; | |
ffe60014 | 1958 | } |
d0b96690 | 1959 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
1960 | if (ret != -ENOMEM) { |
1961 | /* | |
1962 | * Tracer is probably gone or got an internal error so let's | |
1963 | * behave like it will soon unregister or not usable. | |
1964 | */ | |
1965 | ret = -ENOTCONN; | |
1966 | } | |
1967 | goto error; | |
421cb601 DG |
1968 | } |
1969 | ||
7972aab2 DG |
1970 | ua_sess->handle = ret; |
1971 | ||
1972 | /* Add ust app session to app's HT */ | |
d9bf3ca4 MD |
1973 | lttng_ht_node_init_u64(&ua_sess->node, |
1974 | ua_sess->tracing_id); | |
1975 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
7972aab2 DG |
1976 | |
1977 | DBG2("UST app session created successfully with handle %d", ret); | |
1978 | } | |
1979 | ||
1980 | *ua_sess_ptr = ua_sess; | |
1981 | if (is_created) { | |
1982 | *is_created = created; | |
1983 | } | |
1984 | ||
1985 | /* Everything went well. */ | |
1986 | ret = 0; | |
1987 | ||
1988 | error: | |
1989 | health_code_update(); | |
1990 | return ret; | |
1991 | } | |
1992 | ||
6a6b2068 JG |
1993 | /* |
1994 | * Match function for a hash table lookup of ust_app_ctx. | |
1995 | * | |
1996 | * It matches an ust app context based on the context type and, in the case | |
1997 | * of perf counters, their name. | |
1998 | */ | |
1999 | static int ht_match_ust_app_ctx(struct cds_lfht_node *node, const void *_key) | |
2000 | { | |
2001 | struct ust_app_ctx *ctx; | |
2002 | const struct lttng_ust_context *key; | |
2003 | ||
2004 | assert(node); | |
2005 | assert(_key); | |
2006 | ||
2007 | ctx = caa_container_of(node, struct ust_app_ctx, node.node); | |
2008 | key = _key; | |
2009 | ||
2010 | /* Context type */ | |
2011 | if (ctx->ctx.ctx != key->ctx) { | |
2012 | goto no_match; | |
2013 | } | |
2014 | ||
2015 | /* Check the name in the case of perf thread counters. */ | |
2016 | if (key->ctx == LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER) { | |
2017 | if (strncmp(key->u.perf_counter.name, | |
2018 | ctx->ctx.u.perf_counter.name, | |
2019 | sizeof(key->u.perf_counter.name))) { | |
2020 | goto no_match; | |
2021 | } | |
2022 | } | |
2023 | ||
2024 | /* Match. */ | |
2025 | return 1; | |
2026 | ||
2027 | no_match: | |
2028 | return 0; | |
2029 | } | |
2030 | ||
2031 | /* | |
2032 | * Lookup for an ust app context from an lttng_ust_context. | |
2033 | * | |
be184a0f | 2034 | * Must be called while holding RCU read side lock. |
6a6b2068 JG |
2035 | * Return an ust_app_ctx object or NULL on error. |
2036 | */ | |
2037 | static | |
2038 | struct ust_app_ctx *find_ust_app_context(struct lttng_ht *ht, | |
2039 | struct lttng_ust_context *uctx) | |
2040 | { | |
2041 | struct lttng_ht_iter iter; | |
2042 | struct lttng_ht_node_ulong *node; | |
2043 | struct ust_app_ctx *app_ctx = NULL; | |
2044 | ||
2045 | assert(uctx); | |
2046 | assert(ht); | |
2047 | ||
2048 | /* Lookup using the lttng_ust_context_type and a custom match fct. */ | |
2049 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) uctx->ctx, lttng_ht_seed), | |
2050 | ht_match_ust_app_ctx, uctx, &iter.iter); | |
2051 | node = lttng_ht_iter_get_node_ulong(&iter); | |
2052 | if (!node) { | |
2053 | goto end; | |
2054 | } | |
2055 | ||
2056 | app_ctx = caa_container_of(node, struct ust_app_ctx, node); | |
2057 | ||
2058 | end: | |
2059 | return app_ctx; | |
2060 | } | |
2061 | ||
7972aab2 DG |
2062 | /* |
2063 | * Create a context for the channel on the tracer. | |
2064 | * | |
2065 | * Called with UST app session lock held and a RCU read side lock. | |
2066 | */ | |
2067 | static | |
2068 | int create_ust_app_channel_context(struct ust_app_session *ua_sess, | |
2069 | struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx, | |
2070 | struct ust_app *app) | |
2071 | { | |
2072 | int ret = 0; | |
7972aab2 DG |
2073 | struct ust_app_ctx *ua_ctx; |
2074 | ||
2075 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
2076 | ||
6a6b2068 JG |
2077 | ua_ctx = find_ust_app_context(ua_chan->ctx, uctx); |
2078 | if (ua_ctx) { | |
7972aab2 DG |
2079 | ret = -EEXIST; |
2080 | goto error; | |
2081 | } | |
2082 | ||
2083 | ua_ctx = alloc_ust_app_ctx(uctx); | |
2084 | if (ua_ctx == NULL) { | |
2085 | /* malloc failed */ | |
2086 | ret = -1; | |
2087 | goto error; | |
2088 | } | |
2089 | ||
2090 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 2091 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 2092 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
2093 | |
2094 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
2095 | if (ret < 0) { | |
2096 | goto error; | |
2097 | } | |
2098 | ||
2099 | error: | |
2100 | return ret; | |
2101 | } | |
2102 | ||
2103 | /* | |
2104 | * Enable on the tracer side a ust app event for the session and channel. | |
2105 | * | |
2106 | * Called with UST app session lock held. | |
2107 | */ | |
2108 | static | |
2109 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
2110 | struct ust_app_event *ua_event, struct ust_app *app) | |
2111 | { | |
2112 | int ret; | |
2113 | ||
2114 | ret = enable_ust_event(app, ua_sess, ua_event); | |
2115 | if (ret < 0) { | |
2116 | goto error; | |
2117 | } | |
2118 | ||
2119 | ua_event->enabled = 1; | |
2120 | ||
2121 | error: | |
2122 | return ret; | |
2123 | } | |
2124 | ||
2125 | /* | |
2126 | * Disable on the tracer side a ust app event for the session and channel. | |
2127 | */ | |
2128 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
2129 | struct ust_app_event *ua_event, struct ust_app *app) | |
2130 | { | |
2131 | int ret; | |
2132 | ||
2133 | ret = disable_ust_event(app, ua_sess, ua_event); | |
2134 | if (ret < 0) { | |
2135 | goto error; | |
2136 | } | |
2137 | ||
2138 | ua_event->enabled = 0; | |
2139 | ||
2140 | error: | |
2141 | return ret; | |
2142 | } | |
2143 | ||
2144 | /* | |
2145 | * Lookup ust app channel for session and disable it on the tracer side. | |
2146 | */ | |
2147 | static | |
2148 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
2149 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
2150 | { | |
2151 | int ret; | |
2152 | ||
2153 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2154 | if (ret < 0) { | |
2155 | goto error; | |
2156 | } | |
2157 | ||
2158 | ua_chan->enabled = 0; | |
2159 | ||
2160 | error: | |
2161 | return ret; | |
2162 | } | |
2163 | ||
2164 | /* | |
2165 | * Lookup ust app channel for session and enable it on the tracer side. This | |
2166 | * MUST be called with a RCU read side lock acquired. | |
2167 | */ | |
2168 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
2169 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
2170 | { | |
2171 | int ret = 0; | |
2172 | struct lttng_ht_iter iter; | |
2173 | struct lttng_ht_node_str *ua_chan_node; | |
2174 | struct ust_app_channel *ua_chan; | |
2175 | ||
2176 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
2177 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
2178 | if (ua_chan_node == NULL) { | |
d9bf3ca4 | 2179 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
2180 | uchan->name, ua_sess->tracing_id); |
2181 | goto error; | |
2182 | } | |
2183 | ||
2184 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2185 | ||
2186 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
2187 | if (ret < 0) { | |
2188 | goto error; | |
2189 | } | |
2190 | ||
2191 | error: | |
2192 | return ret; | |
2193 | } | |
2194 | ||
2195 | /* | |
2196 | * Ask the consumer to create a channel and get it if successful. | |
2197 | * | |
2198 | * Return 0 on success or else a negative value. | |
2199 | */ | |
2200 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
2201 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
2202 | int bitness, struct ust_registry_session *registry) | |
2203 | { | |
2204 | int ret; | |
2205 | unsigned int nb_fd = 0; | |
2206 | struct consumer_socket *socket; | |
2207 | ||
2208 | assert(usess); | |
2209 | assert(ua_sess); | |
2210 | assert(ua_chan); | |
2211 | assert(registry); | |
2212 | ||
2213 | rcu_read_lock(); | |
2214 | health_code_update(); | |
2215 | ||
2216 | /* Get the right consumer socket for the application. */ | |
2217 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
2218 | if (!socket) { | |
2219 | ret = -EINVAL; | |
2220 | goto error; | |
2221 | } | |
2222 | ||
2223 | health_code_update(); | |
2224 | ||
2225 | /* Need one fd for the channel. */ | |
2226 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2227 | if (ret < 0) { | |
2228 | ERR("Exhausted number of available FD upon create channel"); | |
2229 | goto error; | |
2230 | } | |
2231 | ||
2232 | /* | |
2233 | * Ask consumer to create channel. The consumer will return the number of | |
2234 | * stream we have to expect. | |
2235 | */ | |
2236 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
2237 | registry); | |
2238 | if (ret < 0) { | |
2239 | goto error_ask; | |
2240 | } | |
2241 | ||
2242 | /* | |
2243 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2244 | * stream (2 being the default value here). | |
2245 | */ | |
2246 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2247 | ||
2248 | /* Reserve the amount of file descriptor we need. */ | |
2249 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2250 | if (ret < 0) { | |
2251 | ERR("Exhausted number of available FD upon create channel"); | |
2252 | goto error_fd_get_stream; | |
2253 | } | |
2254 | ||
2255 | health_code_update(); | |
2256 | ||
2257 | /* | |
2258 | * Now get the channel from the consumer. This call wil populate the stream | |
2259 | * list of that channel and set the ust objects. | |
2260 | */ | |
d9078d0c DG |
2261 | if (usess->consumer->enabled) { |
2262 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2263 | if (ret < 0) { | |
2264 | goto error_destroy; | |
2265 | } | |
7972aab2 DG |
2266 | } |
2267 | ||
2268 | rcu_read_unlock(); | |
2269 | return 0; | |
2270 | ||
2271 | error_destroy: | |
2272 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2273 | error_fd_get_stream: | |
2274 | /* | |
2275 | * Initiate a destroy channel on the consumer since we had an error | |
2276 | * handling it on our side. The return value is of no importance since we | |
2277 | * already have a ret value set by the previous error that we need to | |
2278 | * return. | |
2279 | */ | |
2280 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2281 | error_ask: | |
2282 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2283 | error: | |
2284 | health_code_update(); | |
2285 | rcu_read_unlock(); | |
2286 | return ret; | |
2287 | } | |
2288 | ||
2289 | /* | |
2290 | * Duplicate the ust data object of the ust app stream and save it in the | |
2291 | * buffer registry stream. | |
2292 | * | |
2293 | * Return 0 on success or else a negative value. | |
2294 | */ | |
2295 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2296 | struct ust_app_stream *stream) | |
2297 | { | |
2298 | int ret; | |
2299 | ||
2300 | assert(reg_stream); | |
2301 | assert(stream); | |
2302 | ||
2303 | /* Reserve the amount of file descriptor we need. */ | |
2304 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2305 | if (ret < 0) { | |
2306 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2307 | goto error; | |
2308 | } | |
2309 | ||
2310 | /* Duplicate object for stream once the original is in the registry. */ | |
2311 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2312 | reg_stream->obj.ust); | |
2313 | if (ret < 0) { | |
2314 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2315 | reg_stream->obj.ust, stream->obj, ret); | |
2316 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2317 | goto error; | |
2318 | } | |
2319 | stream->handle = stream->obj->handle; | |
2320 | ||
2321 | error: | |
2322 | return ret; | |
2323 | } | |
2324 | ||
2325 | /* | |
2326 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2327 | * buffer registry channel. | |
2328 | * | |
2329 | * Return 0 on success or else a negative value. | |
2330 | */ | |
2331 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2332 | struct ust_app_channel *ua_chan) | |
2333 | { | |
2334 | int ret; | |
2335 | ||
2336 | assert(reg_chan); | |
2337 | assert(ua_chan); | |
2338 | ||
2339 | /* Need two fds for the channel. */ | |
2340 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2341 | if (ret < 0) { | |
2342 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2343 | goto error_fd_get; | |
2344 | } | |
2345 | ||
2346 | /* Duplicate object for stream once the original is in the registry. */ | |
2347 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2348 | if (ret < 0) { | |
2349 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2350 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2351 | goto error; | |
2352 | } | |
2353 | ua_chan->handle = ua_chan->obj->handle; | |
2354 | ||
2355 | return 0; | |
2356 | ||
2357 | error: | |
2358 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2359 | error_fd_get: | |
2360 | return ret; | |
2361 | } | |
2362 | ||
2363 | /* | |
2364 | * For a given channel buffer registry, setup all streams of the given ust | |
2365 | * application channel. | |
2366 | * | |
2367 | * Return 0 on success or else a negative value. | |
2368 | */ | |
2369 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
2370 | struct ust_app_channel *ua_chan) | |
2371 | { | |
2372 | int ret = 0; | |
2373 | struct ust_app_stream *stream, *stmp; | |
2374 | ||
2375 | assert(reg_chan); | |
2376 | assert(ua_chan); | |
2377 | ||
2378 | DBG2("UST app setup buffer registry stream"); | |
2379 | ||
2380 | /* Send all streams to application. */ | |
2381 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2382 | struct buffer_reg_stream *reg_stream; | |
2383 | ||
2384 | ret = buffer_reg_stream_create(®_stream); | |
2385 | if (ret < 0) { | |
2386 | goto error; | |
2387 | } | |
2388 | ||
2389 | /* | |
2390 | * Keep original pointer and nullify it in the stream so the delete | |
2391 | * stream call does not release the object. | |
2392 | */ | |
2393 | reg_stream->obj.ust = stream->obj; | |
2394 | stream->obj = NULL; | |
2395 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2396 | |
7972aab2 DG |
2397 | /* We don't need the streams anymore. */ |
2398 | cds_list_del(&stream->list); | |
2399 | delete_ust_app_stream(-1, stream); | |
2400 | } | |
421cb601 | 2401 | |
7972aab2 DG |
2402 | error: |
2403 | return ret; | |
2404 | } | |
2405 | ||
2406 | /* | |
2407 | * Create a buffer registry channel for the given session registry and | |
2408 | * application channel object. If regp pointer is valid, it's set with the | |
2409 | * created object. Important, the created object is NOT added to the session | |
2410 | * registry hash table. | |
2411 | * | |
2412 | * Return 0 on success else a negative value. | |
2413 | */ | |
2414 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2415 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2416 | { | |
2417 | int ret; | |
2418 | struct buffer_reg_channel *reg_chan = NULL; | |
2419 | ||
2420 | assert(reg_sess); | |
2421 | assert(ua_chan); | |
2422 | ||
2423 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2424 | ||
2425 | /* Create buffer registry channel. */ | |
2426 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2427 | if (ret < 0) { | |
2428 | goto error_create; | |
421cb601 | 2429 | } |
7972aab2 DG |
2430 | assert(reg_chan); |
2431 | reg_chan->consumer_key = ua_chan->key; | |
8c924c7b | 2432 | reg_chan->subbuf_size = ua_chan->attr.subbuf_size; |
d07ceecd | 2433 | reg_chan->num_subbuf = ua_chan->attr.num_subbuf; |
421cb601 | 2434 | |
7972aab2 DG |
2435 | /* Create and add a channel registry to session. */ |
2436 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2437 | ua_chan->tracing_channel_id); | |
2438 | if (ret < 0) { | |
2439 | goto error; | |
d88aee68 | 2440 | } |
7972aab2 | 2441 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2442 | |
7972aab2 DG |
2443 | if (regp) { |
2444 | *regp = reg_chan; | |
3d8ca23b | 2445 | } |
d88aee68 | 2446 | |
7972aab2 | 2447 | return 0; |
3d8ca23b DG |
2448 | |
2449 | error: | |
7972aab2 DG |
2450 | /* Safe because the registry channel object was not added to any HT. */ |
2451 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2452 | error_create: | |
3d8ca23b | 2453 | return ret; |
421cb601 DG |
2454 | } |
2455 | ||
55cc08a6 | 2456 | /* |
7972aab2 DG |
2457 | * Setup buffer registry channel for the given session registry and application |
2458 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2459 | * |
7972aab2 | 2460 | * Return 0 on success else a negative value. |
55cc08a6 | 2461 | */ |
7972aab2 DG |
2462 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
2463 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan) | |
55cc08a6 | 2464 | { |
7972aab2 | 2465 | int ret; |
55cc08a6 | 2466 | |
7972aab2 DG |
2467 | assert(reg_sess); |
2468 | assert(reg_chan); | |
2469 | assert(ua_chan); | |
2470 | assert(ua_chan->obj); | |
55cc08a6 | 2471 | |
7972aab2 | 2472 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2473 | |
7972aab2 DG |
2474 | /* Setup all streams for the registry. */ |
2475 | ret = setup_buffer_reg_streams(reg_chan, ua_chan); | |
2476 | if (ret < 0) { | |
55cc08a6 DG |
2477 | goto error; |
2478 | } | |
2479 | ||
7972aab2 DG |
2480 | reg_chan->obj.ust = ua_chan->obj; |
2481 | ua_chan->obj = NULL; | |
55cc08a6 | 2482 | |
7972aab2 | 2483 | return 0; |
55cc08a6 DG |
2484 | |
2485 | error: | |
7972aab2 DG |
2486 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2487 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2488 | return ret; |
2489 | } | |
2490 | ||
edb67388 | 2491 | /* |
7972aab2 | 2492 | * Send buffer registry channel to the application. |
d0b96690 | 2493 | * |
7972aab2 | 2494 | * Return 0 on success else a negative value. |
edb67388 | 2495 | */ |
7972aab2 DG |
2496 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2497 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2498 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2499 | { |
2500 | int ret; | |
7972aab2 | 2501 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2502 | |
7972aab2 DG |
2503 | assert(reg_chan); |
2504 | assert(app); | |
2505 | assert(ua_sess); | |
2506 | assert(ua_chan); | |
2507 | ||
2508 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2509 | ||
2510 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2511 | if (ret < 0) { |
2512 | goto error; | |
2513 | } | |
2514 | ||
7972aab2 DG |
2515 | /* Send channel to the application. */ |
2516 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
2517 | if (ret < 0) { | |
2518 | goto error; | |
2519 | } | |
2520 | ||
2521 | health_code_update(); | |
2522 | ||
2523 | /* Send all streams to application. */ | |
2524 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2525 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2526 | struct ust_app_stream stream; | |
2527 | ||
2528 | ret = duplicate_stream_object(reg_stream, &stream); | |
2529 | if (ret < 0) { | |
2530 | goto error_stream_unlock; | |
2531 | } | |
2532 | ||
2533 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2534 | if (ret < 0) { | |
8c067051 | 2535 | (void) release_ust_app_stream(-1, &stream); |
7972aab2 DG |
2536 | goto error_stream_unlock; |
2537 | } | |
edb67388 | 2538 | |
7972aab2 DG |
2539 | /* |
2540 | * The return value is not important here. This function will output an | |
2541 | * error if needed. | |
2542 | */ | |
2543 | (void) release_ust_app_stream(-1, &stream); | |
2544 | } | |
2545 | ua_chan->is_sent = 1; | |
2546 | ||
2547 | error_stream_unlock: | |
2548 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2549 | error: |
2550 | return ret; | |
2551 | } | |
2552 | ||
9730260e | 2553 | /* |
7972aab2 DG |
2554 | * Create and send to the application the created buffers with per UID buffers. |
2555 | * | |
2556 | * Return 0 on success else a negative value. | |
9730260e | 2557 | */ |
7972aab2 DG |
2558 | static int create_channel_per_uid(struct ust_app *app, |
2559 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2560 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2561 | { |
2562 | int ret; | |
7972aab2 DG |
2563 | struct buffer_reg_uid *reg_uid; |
2564 | struct buffer_reg_channel *reg_chan; | |
9730260e | 2565 | |
7972aab2 DG |
2566 | assert(app); |
2567 | assert(usess); | |
2568 | assert(ua_sess); | |
2569 | assert(ua_chan); | |
2570 | ||
2571 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2572 | ||
2573 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2574 | /* | |
2575 | * The session creation handles the creation of this global registry | |
2576 | * object. If none can be find, there is a code flow problem or a | |
2577 | * teardown race. | |
2578 | */ | |
2579 | assert(reg_uid); | |
2580 | ||
2581 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2582 | reg_uid); | |
2583 | if (!reg_chan) { | |
2584 | /* Create the buffer registry channel object. */ | |
2585 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2586 | if (ret < 0) { | |
f14256d6 MD |
2587 | ERR("Error creating the UST channel \"%s\" registry instance", |
2588 | ua_chan->name); | |
7972aab2 DG |
2589 | goto error; |
2590 | } | |
2591 | assert(reg_chan); | |
2592 | ||
2593 | /* | |
2594 | * Create the buffers on the consumer side. This call populates the | |
2595 | * ust app channel object with all streams and data object. | |
2596 | */ | |
2597 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2598 | app->bits_per_long, reg_uid->registry->reg.ust); | |
2599 | if (ret < 0) { | |
f14256d6 MD |
2600 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
2601 | ua_chan->name); | |
2602 | ||
07d2ae95 DG |
2603 | /* |
2604 | * Let's remove the previously created buffer registry channel so | |
2605 | * it's not visible anymore in the session registry. | |
2606 | */ | |
2607 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, | |
2608 | ua_chan->tracing_channel_id); | |
2609 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
2610 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
7972aab2 DG |
2611 | goto error; |
2612 | } | |
2613 | ||
2614 | /* | |
2615 | * Setup the streams and add it to the session registry. | |
2616 | */ | |
2617 | ret = setup_buffer_reg_channel(reg_uid->registry, ua_chan, reg_chan); | |
2618 | if (ret < 0) { | |
f14256d6 MD |
2619 | ERR("Error setting up UST channel \"%s\"", |
2620 | ua_chan->name); | |
7972aab2 DG |
2621 | goto error; |
2622 | } | |
2623 | ||
2624 | } | |
2625 | ||
2626 | /* Send buffers to the application. */ | |
2627 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
9730260e | 2628 | if (ret < 0) { |
f14256d6 MD |
2629 | /* |
2630 | * Don't report error to the console, since it may be | |
2631 | * caused by application concurrently exiting. | |
2632 | */ | |
9730260e DG |
2633 | goto error; |
2634 | } | |
2635 | ||
9730260e DG |
2636 | error: |
2637 | return ret; | |
2638 | } | |
2639 | ||
78f0bacd | 2640 | /* |
7972aab2 DG |
2641 | * Create and send to the application the created buffers with per PID buffers. |
2642 | * | |
2643 | * Return 0 on success else a negative value. | |
78f0bacd | 2644 | */ |
7972aab2 DG |
2645 | static int create_channel_per_pid(struct ust_app *app, |
2646 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2647 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2648 | { |
8535a6d9 | 2649 | int ret; |
7972aab2 | 2650 | struct ust_registry_session *registry; |
78f0bacd | 2651 | |
7972aab2 DG |
2652 | assert(app); |
2653 | assert(usess); | |
2654 | assert(ua_sess); | |
2655 | assert(ua_chan); | |
2656 | ||
2657 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2658 | ||
2659 | rcu_read_lock(); | |
2660 | ||
2661 | registry = get_session_registry(ua_sess); | |
2662 | assert(registry); | |
2663 | ||
2664 | /* Create and add a new channel registry to session. */ | |
2665 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd | 2666 | if (ret < 0) { |
f14256d6 MD |
2667 | ERR("Error creating the UST channel \"%s\" registry instance", |
2668 | ua_chan->name); | |
78f0bacd DG |
2669 | goto error; |
2670 | } | |
2671 | ||
7972aab2 DG |
2672 | /* Create and get channel on the consumer side. */ |
2673 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2674 | app->bits_per_long, registry); | |
2675 | if (ret < 0) { | |
f14256d6 MD |
2676 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
2677 | ua_chan->name); | |
7972aab2 DG |
2678 | goto error; |
2679 | } | |
2680 | ||
2681 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
2682 | if (ret < 0) { | |
f14256d6 MD |
2683 | /* |
2684 | * Don't report error to the console, since it may be | |
2685 | * caused by application concurrently exiting. | |
2686 | */ | |
7972aab2 DG |
2687 | goto error; |
2688 | } | |
8535a6d9 | 2689 | |
78f0bacd | 2690 | error: |
7972aab2 | 2691 | rcu_read_unlock(); |
78f0bacd DG |
2692 | return ret; |
2693 | } | |
2694 | ||
2695 | /* | |
7972aab2 DG |
2696 | * From an already allocated ust app channel, create the channel buffers if |
2697 | * need and send it to the application. This MUST be called with a RCU read | |
2698 | * side lock acquired. | |
2699 | * | |
2700 | * Return 0 on success or else a negative value. | |
78f0bacd | 2701 | */ |
7972aab2 DG |
2702 | static int do_create_channel(struct ust_app *app, |
2703 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2704 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2705 | { |
7972aab2 | 2706 | int ret; |
78f0bacd | 2707 | |
7972aab2 DG |
2708 | assert(app); |
2709 | assert(usess); | |
2710 | assert(ua_sess); | |
2711 | assert(ua_chan); | |
2712 | ||
2713 | /* Handle buffer type before sending the channel to the application. */ | |
2714 | switch (usess->buffer_type) { | |
2715 | case LTTNG_BUFFER_PER_UID: | |
2716 | { | |
2717 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
2718 | if (ret < 0) { | |
2719 | goto error; | |
2720 | } | |
2721 | break; | |
2722 | } | |
2723 | case LTTNG_BUFFER_PER_PID: | |
2724 | { | |
2725 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
2726 | if (ret < 0) { | |
2727 | goto error; | |
2728 | } | |
2729 | break; | |
2730 | } | |
2731 | default: | |
2732 | assert(0); | |
2733 | ret = -EINVAL; | |
78f0bacd DG |
2734 | goto error; |
2735 | } | |
2736 | ||
7972aab2 DG |
2737 | /* Initialize ust objd object using the received handle and add it. */ |
2738 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
2739 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 2740 | |
7972aab2 DG |
2741 | /* If channel is not enabled, disable it on the tracer */ |
2742 | if (!ua_chan->enabled) { | |
2743 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2744 | if (ret < 0) { | |
2745 | goto error; | |
2746 | } | |
78f0bacd DG |
2747 | } |
2748 | ||
2749 | error: | |
2750 | return ret; | |
2751 | } | |
2752 | ||
284d8f55 | 2753 | /* |
4d710ac2 DG |
2754 | * Create UST app channel and create it on the tracer. Set ua_chanp of the |
2755 | * newly created channel if not NULL. | |
d0b96690 | 2756 | * |
36b588ed | 2757 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 DG |
2758 | * |
2759 | * Return 0 on success or else a negative value. | |
284d8f55 | 2760 | */ |
4d710ac2 DG |
2761 | static int create_ust_app_channel(struct ust_app_session *ua_sess, |
2762 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
7972aab2 | 2763 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 2764 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
2765 | { |
2766 | int ret = 0; | |
bec39940 DG |
2767 | struct lttng_ht_iter iter; |
2768 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
2769 | struct ust_app_channel *ua_chan; |
2770 | ||
2771 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
2772 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
2773 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 2774 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 2775 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 2776 | goto end; |
5b4a0ec0 DG |
2777 | } |
2778 | ||
d0b96690 | 2779 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
2780 | if (ua_chan == NULL) { |
2781 | /* Only malloc can fail here */ | |
4d710ac2 | 2782 | ret = -ENOMEM; |
094d1690 | 2783 | goto error_alloc; |
fc34caaa DG |
2784 | } |
2785 | shadow_copy_channel(ua_chan, uchan); | |
2786 | ||
ffe60014 DG |
2787 | /* Set channel type. */ |
2788 | ua_chan->attr.type = type; | |
2789 | ||
7972aab2 | 2790 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
5b4a0ec0 DG |
2791 | if (ret < 0) { |
2792 | goto error; | |
2793 | } | |
2794 | ||
fc34caaa | 2795 | DBG2("UST app create channel %s for PID %d completed", ua_chan->name, |
852d0037 | 2796 | app->pid); |
fc34caaa | 2797 | |
d0b96690 DG |
2798 | /* Only add the channel if successful on the tracer side. */ |
2799 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
2800 | ||
fc34caaa | 2801 | end: |
4d710ac2 DG |
2802 | if (ua_chanp) { |
2803 | *ua_chanp = ua_chan; | |
2804 | } | |
2805 | ||
2806 | /* Everything went well. */ | |
2807 | return 0; | |
5b4a0ec0 DG |
2808 | |
2809 | error: | |
d0b96690 | 2810 | delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app); |
094d1690 | 2811 | error_alloc: |
4d710ac2 | 2812 | return ret; |
5b4a0ec0 DG |
2813 | } |
2814 | ||
2815 | /* | |
2816 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
2817 | * |
2818 | * Called with ust app session mutex held. | |
5b4a0ec0 | 2819 | */ |
edb67388 DG |
2820 | static |
2821 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
2822 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
2823 | struct ust_app *app) | |
284d8f55 | 2824 | { |
edb67388 | 2825 | int ret = 0; |
5b4a0ec0 | 2826 | struct ust_app_event *ua_event; |
284d8f55 | 2827 | |
5b4a0ec0 | 2828 | /* Get event node */ |
18eace3b | 2829 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 2830 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 2831 | if (ua_event != NULL) { |
fc34caaa | 2832 | ret = -EEXIST; |
edb67388 DG |
2833 | goto end; |
2834 | } | |
5b4a0ec0 | 2835 | |
edb67388 DG |
2836 | /* Does not exist so create one */ |
2837 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); | |
2838 | if (ua_event == NULL) { | |
2839 | /* Only malloc can failed so something is really wrong */ | |
2840 | ret = -ENOMEM; | |
fc34caaa | 2841 | goto end; |
5b4a0ec0 | 2842 | } |
edb67388 | 2843 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 2844 | |
edb67388 | 2845 | /* Create it on the tracer side */ |
5b4a0ec0 | 2846 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 2847 | if (ret < 0) { |
fc34caaa | 2848 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 2849 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
2850 | goto error; |
2851 | } | |
2852 | ||
d0b96690 | 2853 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 2854 | |
fc34caaa | 2855 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 2856 | app->pid); |
7f79d3a1 | 2857 | |
edb67388 | 2858 | end: |
fc34caaa DG |
2859 | return ret; |
2860 | ||
5b4a0ec0 | 2861 | error: |
fc34caaa DG |
2862 | /* Valid. Calling here is already in a read side lock */ |
2863 | delete_ust_app_event(-1, ua_event); | |
edb67388 | 2864 | return ret; |
5b4a0ec0 DG |
2865 | } |
2866 | ||
2867 | /* | |
2868 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 2869 | * |
7972aab2 | 2870 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
2871 | */ |
2872 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
ad7a9107 | 2873 | struct ust_app *app, struct consumer_output *consumer) |
5b4a0ec0 DG |
2874 | { |
2875 | int ret = 0; | |
ffe60014 | 2876 | struct ust_app_channel *metadata; |
d88aee68 | 2877 | struct consumer_socket *socket; |
7972aab2 | 2878 | struct ust_registry_session *registry; |
5b4a0ec0 | 2879 | |
ffe60014 DG |
2880 | assert(ua_sess); |
2881 | assert(app); | |
d88aee68 | 2882 | assert(consumer); |
5b4a0ec0 | 2883 | |
7972aab2 DG |
2884 | registry = get_session_registry(ua_sess); |
2885 | assert(registry); | |
2886 | ||
ce34fcd0 MD |
2887 | pthread_mutex_lock(®istry->lock); |
2888 | ||
1b532a60 DG |
2889 | /* Metadata already exists for this registry or it was closed previously */ |
2890 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
2891 | ret = 0; |
2892 | goto error; | |
5b4a0ec0 DG |
2893 | } |
2894 | ||
ffe60014 | 2895 | /* Allocate UST metadata */ |
d0b96690 | 2896 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
2897 | if (!metadata) { |
2898 | /* malloc() failed */ | |
2899 | ret = -ENOMEM; | |
2900 | goto error; | |
2901 | } | |
5b4a0ec0 | 2902 | |
ad7a9107 | 2903 | memcpy(&metadata->attr, &ua_sess->metadata_attr, sizeof(metadata->attr)); |
5b4a0ec0 | 2904 | |
7972aab2 DG |
2905 | /* Need one fd for the channel. */ |
2906 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2907 | if (ret < 0) { | |
2908 | ERR("Exhausted number of available FD upon create metadata"); | |
2909 | goto error; | |
2910 | } | |
2911 | ||
4dc3dfc5 DG |
2912 | /* Get the right consumer socket for the application. */ |
2913 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
2914 | if (!socket) { | |
2915 | ret = -EINVAL; | |
2916 | goto error_consumer; | |
2917 | } | |
2918 | ||
331744e3 JD |
2919 | /* |
2920 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
2921 | * to the registry *before* we ask the consumer so we avoid the race of the | |
2922 | * consumer requesting the metadata and the ask_channel call on our side | |
2923 | * did not returned yet. | |
2924 | */ | |
2925 | registry->metadata_key = metadata->key; | |
2926 | ||
d88aee68 DG |
2927 | /* |
2928 | * Ask the metadata channel creation to the consumer. The metadata object | |
2929 | * will be created by the consumer and kept their. However, the stream is | |
2930 | * never added or monitored until we do a first push metadata to the | |
2931 | * consumer. | |
2932 | */ | |
7972aab2 DG |
2933 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
2934 | registry); | |
d88aee68 | 2935 | if (ret < 0) { |
f2a444f1 DG |
2936 | /* Nullify the metadata key so we don't try to close it later on. */ |
2937 | registry->metadata_key = 0; | |
d88aee68 DG |
2938 | goto error_consumer; |
2939 | } | |
2940 | ||
2941 | /* | |
2942 | * The setup command will make the metadata stream be sent to the relayd, | |
2943 | * if applicable, and the thread managing the metadatas. This is important | |
2944 | * because after this point, if an error occurs, the only way the stream | |
2945 | * can be deleted is to be monitored in the consumer. | |
2946 | */ | |
7972aab2 | 2947 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 2948 | if (ret < 0) { |
f2a444f1 DG |
2949 | /* Nullify the metadata key so we don't try to close it later on. */ |
2950 | registry->metadata_key = 0; | |
d88aee68 | 2951 | goto error_consumer; |
5b4a0ec0 DG |
2952 | } |
2953 | ||
7972aab2 DG |
2954 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
2955 | metadata->key, app->pid); | |
5b4a0ec0 | 2956 | |
d88aee68 | 2957 | error_consumer: |
b80f0b6c | 2958 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 2959 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 2960 | error: |
ce34fcd0 | 2961 | pthread_mutex_unlock(®istry->lock); |
ffe60014 | 2962 | return ret; |
5b4a0ec0 DG |
2963 | } |
2964 | ||
5b4a0ec0 | 2965 | /* |
d88aee68 DG |
2966 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
2967 | * acquired before calling this function. | |
5b4a0ec0 DG |
2968 | */ |
2969 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
2970 | { | |
d88aee68 | 2971 | struct ust_app *app = NULL; |
bec39940 DG |
2972 | struct lttng_ht_node_ulong *node; |
2973 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 2974 | |
bec39940 DG |
2975 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
2976 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
2977 | if (node == NULL) { |
2978 | DBG2("UST app no found with pid %d", pid); | |
2979 | goto error; | |
2980 | } | |
5b4a0ec0 DG |
2981 | |
2982 | DBG2("Found UST app by pid %d", pid); | |
2983 | ||
d88aee68 | 2984 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
2985 | |
2986 | error: | |
d88aee68 | 2987 | return app; |
5b4a0ec0 DG |
2988 | } |
2989 | ||
d88aee68 DG |
2990 | /* |
2991 | * Allocate and init an UST app object using the registration information and | |
2992 | * the command socket. This is called when the command socket connects to the | |
2993 | * session daemon. | |
2994 | * | |
2995 | * The object is returned on success or else NULL. | |
2996 | */ | |
d0b96690 | 2997 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 2998 | { |
d0b96690 DG |
2999 | struct ust_app *lta = NULL; |
3000 | ||
3001 | assert(msg); | |
3002 | assert(sock >= 0); | |
3003 | ||
3004 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 3005 | |
173af62f DG |
3006 | if ((msg->bits_per_long == 64 && |
3007 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
3008 | || (msg->bits_per_long == 32 && | |
3009 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 3010 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
3011 | "%d-bit long, but no consumerd for this size is available.\n", |
3012 | msg->name, msg->pid, msg->bits_per_long); | |
3013 | goto error; | |
3f2c5fcc | 3014 | } |
d0b96690 | 3015 | |
5b4a0ec0 DG |
3016 | lta = zmalloc(sizeof(struct ust_app)); |
3017 | if (lta == NULL) { | |
3018 | PERROR("malloc"); | |
d0b96690 | 3019 | goto error; |
5b4a0ec0 DG |
3020 | } |
3021 | ||
3022 | lta->ppid = msg->ppid; | |
3023 | lta->uid = msg->uid; | |
3024 | lta->gid = msg->gid; | |
d0b96690 | 3025 | |
7753dea8 | 3026 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
3027 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
3028 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
3029 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
3030 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
3031 | lta->long_alignment = msg->long_alignment; | |
3032 | lta->byte_order = msg->byte_order; | |
3033 | ||
5b4a0ec0 DG |
3034 | lta->v_major = msg->major; |
3035 | lta->v_minor = msg->minor; | |
d9bf3ca4 | 3036 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 DG |
3037 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
3038 | lta->notify_sock = -1; | |
d88aee68 DG |
3039 | |
3040 | /* Copy name and make sure it's NULL terminated. */ | |
3041 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
3042 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
3043 | ||
3044 | /* | |
3045 | * Before this can be called, when receiving the registration information, | |
3046 | * the application compatibility is checked. So, at this point, the | |
3047 | * application can work with this session daemon. | |
3048 | */ | |
d0b96690 | 3049 | lta->compatible = 1; |
5b4a0ec0 | 3050 | |
852d0037 | 3051 | lta->pid = msg->pid; |
d0b96690 | 3052 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 3053 | lta->sock = sock; |
d0b96690 | 3054 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 3055 | |
d42f20df DG |
3056 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
3057 | ||
d0b96690 DG |
3058 | error: |
3059 | return lta; | |
3060 | } | |
3061 | ||
d88aee68 DG |
3062 | /* |
3063 | * For a given application object, add it to every hash table. | |
3064 | */ | |
d0b96690 DG |
3065 | void ust_app_add(struct ust_app *app) |
3066 | { | |
3067 | assert(app); | |
3068 | assert(app->notify_sock >= 0); | |
3069 | ||
5b4a0ec0 | 3070 | rcu_read_lock(); |
852d0037 DG |
3071 | |
3072 | /* | |
3073 | * On a re-registration, we want to kick out the previous registration of | |
3074 | * that pid | |
3075 | */ | |
d0b96690 | 3076 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
3077 | |
3078 | /* | |
3079 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
3080 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
3081 | * already in the table. | |
3082 | */ | |
d0b96690 | 3083 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 3084 | |
d0b96690 DG |
3085 | /* Add application to the notify socket hash table. */ |
3086 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
3087 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 3088 | |
d0b96690 | 3089 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
3090 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
3091 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
3092 | app->v_minor); | |
5b4a0ec0 | 3093 | |
d0b96690 DG |
3094 | rcu_read_unlock(); |
3095 | } | |
3096 | ||
d88aee68 DG |
3097 | /* |
3098 | * Set the application version into the object. | |
3099 | * | |
3100 | * Return 0 on success else a negative value either an errno code or a | |
3101 | * LTTng-UST error code. | |
3102 | */ | |
d0b96690 DG |
3103 | int ust_app_version(struct ust_app *app) |
3104 | { | |
d88aee68 DG |
3105 | int ret; |
3106 | ||
d0b96690 | 3107 | assert(app); |
d88aee68 DG |
3108 | |
3109 | ret = ustctl_tracer_version(app->sock, &app->version); | |
3110 | if (ret < 0) { | |
3111 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
5368d366 | 3112 | ERR("UST app %d version failed with ret %d", app->sock, ret); |
d88aee68 | 3113 | } else { |
5368d366 | 3114 | DBG3("UST app %d version failed. Application is dead", app->sock); |
d88aee68 DG |
3115 | } |
3116 | } | |
3117 | ||
3118 | return ret; | |
5b4a0ec0 DG |
3119 | } |
3120 | ||
3121 | /* | |
3122 | * Unregister app by removing it from the global traceable app list and freeing | |
3123 | * the data struct. | |
3124 | * | |
3125 | * The socket is already closed at this point so no close to sock. | |
3126 | */ | |
3127 | void ust_app_unregister(int sock) | |
3128 | { | |
3129 | struct ust_app *lta; | |
bec39940 | 3130 | struct lttng_ht_node_ulong *node; |
c4b88406 | 3131 | struct lttng_ht_iter ust_app_sock_iter; |
bec39940 | 3132 | struct lttng_ht_iter iter; |
d42f20df | 3133 | struct ust_app_session *ua_sess; |
525b0740 | 3134 | int ret; |
5b4a0ec0 DG |
3135 | |
3136 | rcu_read_lock(); | |
886459c6 | 3137 | |
5b4a0ec0 | 3138 | /* Get the node reference for a call_rcu */ |
c4b88406 MD |
3139 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &ust_app_sock_iter); |
3140 | node = lttng_ht_iter_get_node_ulong(&ust_app_sock_iter); | |
d0b96690 | 3141 | assert(node); |
284d8f55 | 3142 | |
852d0037 | 3143 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
3144 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
3145 | ||
d88aee68 | 3146 | /* |
ce34fcd0 MD |
3147 | * For per-PID buffers, perform "push metadata" and flush all |
3148 | * application streams before removing app from hash tables, | |
3149 | * ensuring proper behavior of data_pending check. | |
c4b88406 | 3150 | * Remove sessions so they are not visible during deletion. |
d88aee68 | 3151 | */ |
d42f20df DG |
3152 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, |
3153 | node.node) { | |
7972aab2 DG |
3154 | struct ust_registry_session *registry; |
3155 | ||
d42f20df DG |
3156 | ret = lttng_ht_del(lta->sessions, &iter); |
3157 | if (ret) { | |
3158 | /* The session was already removed so scheduled for teardown. */ | |
3159 | continue; | |
3160 | } | |
3161 | ||
ce34fcd0 MD |
3162 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { |
3163 | (void) ust_app_flush_app_session(lta, ua_sess); | |
3164 | } | |
c4b88406 | 3165 | |
d42f20df DG |
3166 | /* |
3167 | * Add session to list for teardown. This is safe since at this point we | |
3168 | * are the only one using this list. | |
3169 | */ | |
d88aee68 DG |
3170 | pthread_mutex_lock(&ua_sess->lock); |
3171 | ||
3172 | /* | |
3173 | * Normally, this is done in the delete session process which is | |
3174 | * executed in the call rcu below. However, upon registration we can't | |
3175 | * afford to wait for the grace period before pushing data or else the | |
3176 | * data pending feature can race between the unregistration and stop | |
3177 | * command where the data pending command is sent *before* the grace | |
3178 | * period ended. | |
3179 | * | |
3180 | * The close metadata below nullifies the metadata pointer in the | |
3181 | * session so the delete session will NOT push/close a second time. | |
3182 | */ | |
7972aab2 | 3183 | registry = get_session_registry(ua_sess); |
ce34fcd0 | 3184 | if (registry) { |
7972aab2 DG |
3185 | /* Push metadata for application before freeing the application. */ |
3186 | (void) push_metadata(registry, ua_sess->consumer); | |
3187 | ||
3188 | /* | |
3189 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
3190 | * metadata only on destroy trace session in this case. Also, the |
3191 | * previous push metadata could have flag the metadata registry to | |
3192 | * close so don't send a close command if closed. | |
7972aab2 | 3193 | */ |
ce34fcd0 | 3194 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
3195 | /* And ask to close it for this session registry. */ |
3196 | (void) close_metadata(registry, ua_sess->consumer); | |
3197 | } | |
3198 | } | |
d42f20df | 3199 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
c4b88406 | 3200 | |
d88aee68 | 3201 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
3202 | } |
3203 | ||
c4b88406 MD |
3204 | /* Remove application from PID hash table */ |
3205 | ret = lttng_ht_del(ust_app_ht_by_sock, &ust_app_sock_iter); | |
3206 | assert(!ret); | |
3207 | ||
3208 | /* | |
3209 | * Remove application from notify hash table. The thread handling the | |
3210 | * notify socket could have deleted the node so ignore on error because | |
3211 | * either way it's valid. The close of that socket is handled by the other | |
3212 | * thread. | |
3213 | */ | |
3214 | iter.iter.node = <a->notify_sock_n.node; | |
3215 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3216 | ||
3217 | /* | |
3218 | * Ignore return value since the node might have been removed before by an | |
3219 | * add replace during app registration because the PID can be reassigned by | |
3220 | * the OS. | |
3221 | */ | |
3222 | iter.iter.node = <a->pid_n.node; | |
3223 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3224 | if (ret) { | |
3225 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
3226 | lta->pid); | |
3227 | } | |
3228 | ||
852d0037 DG |
3229 | /* Free memory */ |
3230 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
3231 | ||
5b4a0ec0 DG |
3232 | rcu_read_unlock(); |
3233 | return; | |
284d8f55 DG |
3234 | } |
3235 | ||
5b4a0ec0 DG |
3236 | /* |
3237 | * Fill events array with all events name of all registered apps. | |
3238 | */ | |
3239 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 3240 | { |
5b4a0ec0 DG |
3241 | int ret, handle; |
3242 | size_t nbmem, count = 0; | |
bec39940 | 3243 | struct lttng_ht_iter iter; |
5b4a0ec0 | 3244 | struct ust_app *app; |
c617c0c6 | 3245 | struct lttng_event *tmp_event; |
421cb601 | 3246 | |
5b4a0ec0 | 3247 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
3248 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
3249 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
3250 | PERROR("zmalloc ust app events"); |
3251 | ret = -ENOMEM; | |
421cb601 DG |
3252 | goto error; |
3253 | } | |
3254 | ||
5b4a0ec0 | 3255 | rcu_read_lock(); |
421cb601 | 3256 | |
852d0037 | 3257 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 3258 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 3259 | |
840cb59c | 3260 | health_code_update(); |
86acf0da | 3261 | |
e0c7ec2b DG |
3262 | if (!app->compatible) { |
3263 | /* | |
3264 | * TODO: In time, we should notice the caller of this error by | |
3265 | * telling him that this is a version error. | |
3266 | */ | |
3267 | continue; | |
3268 | } | |
852d0037 | 3269 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 3270 | if (handle < 0) { |
ffe60014 DG |
3271 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3272 | ERR("UST app list events getting handle failed for app pid %d", | |
3273 | app->pid); | |
3274 | } | |
5b4a0ec0 DG |
3275 | continue; |
3276 | } | |
421cb601 | 3277 | |
852d0037 | 3278 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 3279 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3280 | /* Handle ustctl error. */ |
3281 | if (ret < 0) { | |
a2ba1ab0 | 3282 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3283 | ERR("UST app tp list get failed for app %d with ret %d", |
3284 | app->sock, ret); | |
3285 | } else { | |
3286 | DBG3("UST app tp list get failed. Application is dead"); | |
3757b385 DG |
3287 | /* |
3288 | * This is normal behavior, an application can die during the | |
3289 | * creation process. Don't report an error so the execution can | |
3290 | * continue normally. Continue normal execution. | |
3291 | */ | |
3292 | break; | |
ffe60014 | 3293 | } |
98f595d4 | 3294 | free(tmp_event); |
ffe60014 DG |
3295 | goto rcu_error; |
3296 | } | |
3297 | ||
840cb59c | 3298 | health_code_update(); |
815564d8 | 3299 | if (count >= nbmem) { |
d7b3776f | 3300 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3301 | struct lttng_event *new_tmp_event; |
3302 | size_t new_nbmem; | |
3303 | ||
3304 | new_nbmem = nbmem << 1; | |
3305 | DBG2("Reallocating event list from %zu to %zu entries", | |
3306 | nbmem, new_nbmem); | |
3307 | new_tmp_event = realloc(tmp_event, | |
3308 | new_nbmem * sizeof(struct lttng_event)); | |
3309 | if (new_tmp_event == NULL) { | |
5b4a0ec0 | 3310 | PERROR("realloc ust app events"); |
c617c0c6 | 3311 | free(tmp_event); |
5b4a0ec0 DG |
3312 | ret = -ENOMEM; |
3313 | goto rcu_error; | |
3314 | } | |
53efb85a MD |
3315 | /* Zero the new memory */ |
3316 | memset(new_tmp_event + nbmem, 0, | |
3317 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
3318 | nbmem = new_nbmem; | |
3319 | tmp_event = new_tmp_event; | |
5b4a0ec0 | 3320 | } |
c617c0c6 MD |
3321 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
3322 | tmp_event[count].loglevel = uiter.loglevel; | |
3323 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
3324 | tmp_event[count].pid = app->pid; | |
3325 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 3326 | count++; |
421cb601 | 3327 | } |
421cb601 DG |
3328 | } |
3329 | ||
5b4a0ec0 | 3330 | ret = count; |
c617c0c6 | 3331 | *events = tmp_event; |
421cb601 | 3332 | |
5b4a0ec0 | 3333 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 3334 | |
5b4a0ec0 DG |
3335 | rcu_error: |
3336 | rcu_read_unlock(); | |
421cb601 | 3337 | error: |
840cb59c | 3338 | health_code_update(); |
5b4a0ec0 | 3339 | return ret; |
421cb601 DG |
3340 | } |
3341 | ||
f37d259d MD |
3342 | /* |
3343 | * Fill events array with all events name of all registered apps. | |
3344 | */ | |
3345 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
3346 | { | |
3347 | int ret, handle; | |
3348 | size_t nbmem, count = 0; | |
3349 | struct lttng_ht_iter iter; | |
3350 | struct ust_app *app; | |
c617c0c6 | 3351 | struct lttng_event_field *tmp_event; |
f37d259d MD |
3352 | |
3353 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
3354 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
3355 | if (tmp_event == NULL) { | |
f37d259d MD |
3356 | PERROR("zmalloc ust app event fields"); |
3357 | ret = -ENOMEM; | |
3358 | goto error; | |
3359 | } | |
3360 | ||
3361 | rcu_read_lock(); | |
3362 | ||
3363 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3364 | struct lttng_ust_field_iter uiter; | |
3365 | ||
840cb59c | 3366 | health_code_update(); |
86acf0da | 3367 | |
f37d259d MD |
3368 | if (!app->compatible) { |
3369 | /* | |
3370 | * TODO: In time, we should notice the caller of this error by | |
3371 | * telling him that this is a version error. | |
3372 | */ | |
3373 | continue; | |
3374 | } | |
3375 | handle = ustctl_tracepoint_field_list(app->sock); | |
3376 | if (handle < 0) { | |
ffe60014 DG |
3377 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3378 | ERR("UST app list field getting handle failed for app pid %d", | |
3379 | app->pid); | |
3380 | } | |
f37d259d MD |
3381 | continue; |
3382 | } | |
3383 | ||
3384 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 3385 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3386 | /* Handle ustctl error. */ |
3387 | if (ret < 0) { | |
a2ba1ab0 | 3388 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3389 | ERR("UST app tp list field failed for app %d with ret %d", |
3390 | app->sock, ret); | |
3391 | } else { | |
3392 | DBG3("UST app tp list field failed. Application is dead"); | |
3757b385 DG |
3393 | /* |
3394 | * This is normal behavior, an application can die during the | |
3395 | * creation process. Don't report an error so the execution can | |
98f595d4 | 3396 | * continue normally. Reset list and count for next app. |
3757b385 DG |
3397 | */ |
3398 | break; | |
ffe60014 | 3399 | } |
98f595d4 | 3400 | free(tmp_event); |
ffe60014 DG |
3401 | goto rcu_error; |
3402 | } | |
3403 | ||
840cb59c | 3404 | health_code_update(); |
f37d259d | 3405 | if (count >= nbmem) { |
d7b3776f | 3406 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3407 | struct lttng_event_field *new_tmp_event; |
3408 | size_t new_nbmem; | |
3409 | ||
3410 | new_nbmem = nbmem << 1; | |
3411 | DBG2("Reallocating event field list from %zu to %zu entries", | |
3412 | nbmem, new_nbmem); | |
3413 | new_tmp_event = realloc(tmp_event, | |
3414 | new_nbmem * sizeof(struct lttng_event_field)); | |
3415 | if (new_tmp_event == NULL) { | |
f37d259d | 3416 | PERROR("realloc ust app event fields"); |
c617c0c6 | 3417 | free(tmp_event); |
f37d259d MD |
3418 | ret = -ENOMEM; |
3419 | goto rcu_error; | |
3420 | } | |
53efb85a MD |
3421 | /* Zero the new memory */ |
3422 | memset(new_tmp_event + nbmem, 0, | |
3423 | (new_nbmem - nbmem) * sizeof(struct lttng_event_field)); | |
3424 | nbmem = new_nbmem; | |
3425 | tmp_event = new_tmp_event; | |
f37d259d | 3426 | } |
f37d259d | 3427 | |
c617c0c6 | 3428 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
2e84128e DG |
3429 | /* Mapping between these enums matches 1 to 1. */ |
3430 | tmp_event[count].type = (enum lttng_event_field_type) uiter.type; | |
c617c0c6 | 3431 | tmp_event[count].nowrite = uiter.nowrite; |
f37d259d | 3432 | |
c617c0c6 MD |
3433 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
3434 | tmp_event[count].event.loglevel = uiter.loglevel; | |
2e84128e | 3435 | tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; |
c617c0c6 MD |
3436 | tmp_event[count].event.pid = app->pid; |
3437 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
3438 | count++; |
3439 | } | |
3440 | } | |
3441 | ||
3442 | ret = count; | |
c617c0c6 | 3443 | *fields = tmp_event; |
f37d259d MD |
3444 | |
3445 | DBG2("UST app list event fields done (%zu events)", count); | |
3446 | ||
3447 | rcu_error: | |
3448 | rcu_read_unlock(); | |
3449 | error: | |
840cb59c | 3450 | health_code_update(); |
f37d259d MD |
3451 | return ret; |
3452 | } | |
3453 | ||
5b4a0ec0 DG |
3454 | /* |
3455 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
3456 | * |
3457 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
3458 | */ |
3459 | void ust_app_clean_list(void) | |
421cb601 | 3460 | { |
5b4a0ec0 | 3461 | int ret; |
659ed79f | 3462 | struct ust_app *app; |
bec39940 | 3463 | struct lttng_ht_iter iter; |
421cb601 | 3464 | |
5b4a0ec0 | 3465 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3466 | |
5b4a0ec0 | 3467 | rcu_read_lock(); |
421cb601 | 3468 | |
f1b711c4 MD |
3469 | if (ust_app_ht) { |
3470 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3471 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3472 | assert(!ret); | |
3473 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
3474 | } | |
421cb601 DG |
3475 | } |
3476 | ||
852d0037 | 3477 | /* Cleanup socket hash table */ |
f1b711c4 MD |
3478 | if (ust_app_ht_by_sock) { |
3479 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, | |
3480 | sock_n.node) { | |
3481 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); | |
3482 | assert(!ret); | |
3483 | } | |
bec39940 | 3484 | } |
852d0037 | 3485 | |
d88aee68 | 3486 | /* Cleanup notify socket hash table */ |
f1b711c4 MD |
3487 | if (ust_app_ht_by_notify_sock) { |
3488 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3489 | notify_sock_n.node) { | |
3490 | ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3491 | assert(!ret); | |
3492 | } | |
d88aee68 | 3493 | } |
36b588ed | 3494 | rcu_read_unlock(); |
d88aee68 | 3495 | |
bec39940 | 3496 | /* Destroy is done only when the ht is empty */ |
f1b711c4 MD |
3497 | if (ust_app_ht) { |
3498 | ht_cleanup_push(ust_app_ht); | |
3499 | } | |
3500 | if (ust_app_ht_by_sock) { | |
3501 | ht_cleanup_push(ust_app_ht_by_sock); | |
3502 | } | |
3503 | if (ust_app_ht_by_notify_sock) { | |
3504 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
3505 | } | |
5b4a0ec0 DG |
3506 | } |
3507 | ||
3508 | /* | |
3509 | * Init UST app hash table. | |
3510 | */ | |
57703f6e | 3511 | int ust_app_ht_alloc(void) |
5b4a0ec0 | 3512 | { |
bec39940 | 3513 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3514 | if (!ust_app_ht) { |
3515 | return -1; | |
3516 | } | |
852d0037 | 3517 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3518 | if (!ust_app_ht_by_sock) { |
3519 | return -1; | |
3520 | } | |
d0b96690 | 3521 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3522 | if (!ust_app_ht_by_notify_sock) { |
3523 | return -1; | |
3524 | } | |
3525 | return 0; | |
421cb601 DG |
3526 | } |
3527 | ||
78f0bacd DG |
3528 | /* |
3529 | * For a specific UST session, disable the channel for all registered apps. | |
3530 | */ | |
35a9059d | 3531 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3532 | struct ltt_ust_channel *uchan) |
3533 | { | |
3534 | int ret = 0; | |
bec39940 DG |
3535 | struct lttng_ht_iter iter; |
3536 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3537 | struct ust_app *app; |
3538 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3539 | struct ust_app_channel *ua_chan; |
78f0bacd DG |
3540 | |
3541 | if (usess == NULL || uchan == NULL) { | |
3542 | ERR("Disabling UST global channel with NULL values"); | |
3543 | ret = -1; | |
3544 | goto error; | |
3545 | } | |
3546 | ||
d9bf3ca4 | 3547 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 3548 | uchan->name, usess->id); |
78f0bacd DG |
3549 | |
3550 | rcu_read_lock(); | |
3551 | ||
3552 | /* For every registered applications */ | |
852d0037 | 3553 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3554 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3555 | if (!app->compatible) { |
3556 | /* | |
3557 | * TODO: In time, we should notice the caller of this error by | |
3558 | * telling him that this is a version error. | |
3559 | */ | |
3560 | continue; | |
3561 | } | |
78f0bacd DG |
3562 | ua_sess = lookup_session_by_app(usess, app); |
3563 | if (ua_sess == NULL) { | |
3564 | continue; | |
3565 | } | |
3566 | ||
8535a6d9 | 3567 | /* Get channel */ |
bec39940 DG |
3568 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3569 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
3570 | /* If the session if found for the app, the channel must be there */ |
3571 | assert(ua_chan_node); | |
3572 | ||
3573 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3574 | /* The channel must not be already disabled */ | |
3575 | assert(ua_chan->enabled == 1); | |
3576 | ||
3577 | /* Disable channel onto application */ | |
3578 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
3579 | if (ret < 0) { |
3580 | /* XXX: We might want to report this error at some point... */ | |
3581 | continue; | |
3582 | } | |
3583 | } | |
3584 | ||
3585 | rcu_read_unlock(); | |
3586 | ||
3587 | error: | |
3588 | return ret; | |
3589 | } | |
3590 | ||
3591 | /* | |
3592 | * For a specific UST session, enable the channel for all registered apps. | |
3593 | */ | |
35a9059d | 3594 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3595 | struct ltt_ust_channel *uchan) |
3596 | { | |
3597 | int ret = 0; | |
bec39940 | 3598 | struct lttng_ht_iter iter; |
78f0bacd DG |
3599 | struct ust_app *app; |
3600 | struct ust_app_session *ua_sess; | |
3601 | ||
3602 | if (usess == NULL || uchan == NULL) { | |
3603 | ERR("Adding UST global channel to NULL values"); | |
3604 | ret = -1; | |
3605 | goto error; | |
3606 | } | |
3607 | ||
d9bf3ca4 | 3608 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 3609 | uchan->name, usess->id); |
78f0bacd DG |
3610 | |
3611 | rcu_read_lock(); | |
3612 | ||
3613 | /* For every registered applications */ | |
852d0037 | 3614 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3615 | if (!app->compatible) { |
3616 | /* | |
3617 | * TODO: In time, we should notice the caller of this error by | |
3618 | * telling him that this is a version error. | |
3619 | */ | |
3620 | continue; | |
3621 | } | |
78f0bacd DG |
3622 | ua_sess = lookup_session_by_app(usess, app); |
3623 | if (ua_sess == NULL) { | |
3624 | continue; | |
3625 | } | |
3626 | ||
3627 | /* Enable channel onto application */ | |
3628 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
3629 | if (ret < 0) { | |
3630 | /* XXX: We might want to report this error at some point... */ | |
3631 | continue; | |
3632 | } | |
3633 | } | |
3634 | ||
3635 | rcu_read_unlock(); | |
3636 | ||
3637 | error: | |
3638 | return ret; | |
3639 | } | |
3640 | ||
b0a40d28 DG |
3641 | /* |
3642 | * Disable an event in a channel and for a specific session. | |
3643 | */ | |
35a9059d DG |
3644 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
3645 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
3646 | { |
3647 | int ret = 0; | |
bec39940 DG |
3648 | struct lttng_ht_iter iter, uiter; |
3649 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
b0a40d28 DG |
3650 | struct ust_app *app; |
3651 | struct ust_app_session *ua_sess; | |
3652 | struct ust_app_channel *ua_chan; | |
3653 | struct ust_app_event *ua_event; | |
3654 | ||
3655 | DBG("UST app disabling event %s for all apps in channel " | |
d9bf3ca4 MD |
3656 | "%s for session id %" PRIu64, |
3657 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
3658 | |
3659 | rcu_read_lock(); | |
3660 | ||
3661 | /* For all registered applications */ | |
852d0037 | 3662 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3663 | if (!app->compatible) { |
3664 | /* | |
3665 | * TODO: In time, we should notice the caller of this error by | |
3666 | * telling him that this is a version error. | |
3667 | */ | |
3668 | continue; | |
3669 | } | |
b0a40d28 DG |
3670 | ua_sess = lookup_session_by_app(usess, app); |
3671 | if (ua_sess == NULL) { | |
3672 | /* Next app */ | |
3673 | continue; | |
3674 | } | |
3675 | ||
3676 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3677 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3678 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 3679 | if (ua_chan_node == NULL) { |
d9bf3ca4 | 3680 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 3681 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
3682 | continue; |
3683 | } | |
3684 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3685 | ||
bec39940 DG |
3686 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter); |
3687 | ua_event_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 DG |
3688 | if (ua_event_node == NULL) { |
3689 | DBG2("Event %s not found in channel %s for app pid %d." | |
852d0037 | 3690 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
3691 | continue; |
3692 | } | |
3693 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
3694 | ||
7f79d3a1 | 3695 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
3696 | if (ret < 0) { |
3697 | /* XXX: Report error someday... */ | |
3698 | continue; | |
3699 | } | |
3700 | } | |
3701 | ||
3702 | rcu_read_unlock(); | |
3703 | ||
3704 | return ret; | |
3705 | } | |
3706 | ||
421cb601 | 3707 | /* |
5b4a0ec0 | 3708 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 3709 | */ |
35a9059d | 3710 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3711 | struct ltt_ust_channel *uchan) |
3712 | { | |
3d8ca23b | 3713 | int ret = 0, created; |
bec39940 | 3714 | struct lttng_ht_iter iter; |
48842b30 | 3715 | struct ust_app *app; |
3d8ca23b | 3716 | struct ust_app_session *ua_sess = NULL; |
48842b30 | 3717 | |
fc34caaa DG |
3718 | /* Very wrong code flow */ |
3719 | assert(usess); | |
3720 | assert(uchan); | |
421cb601 | 3721 | |
d9bf3ca4 | 3722 | DBG2("UST app adding channel %s to UST domain for session id %" PRIu64, |
a991f516 | 3723 | uchan->name, usess->id); |
48842b30 DG |
3724 | |
3725 | rcu_read_lock(); | |
421cb601 | 3726 | |
5b4a0ec0 | 3727 | /* For every registered applications */ |
852d0037 | 3728 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3729 | if (!app->compatible) { |
3730 | /* | |
3731 | * TODO: In time, we should notice the caller of this error by | |
3732 | * telling him that this is a version error. | |
3733 | */ | |
3734 | continue; | |
3735 | } | |
a9ad0c8f MD |
3736 | if (!trace_ust_pid_tracker_lookup(usess, app->pid)) { |
3737 | /* Skip. */ | |
3738 | continue; | |
3739 | } | |
3740 | ||
edb67388 DG |
3741 | /* |
3742 | * Create session on the tracer side and add it to app session HT. Note | |
3743 | * that if session exist, it will simply return a pointer to the ust | |
3744 | * app session. | |
3745 | */ | |
3d8ca23b DG |
3746 | ret = create_ust_app_session(usess, app, &ua_sess, &created); |
3747 | if (ret < 0) { | |
3748 | switch (ret) { | |
3749 | case -ENOTCONN: | |
3750 | /* | |
3751 | * The application's socket is not valid. Either a bad socket | |
3752 | * or a timeout on it. We can't inform the caller that for a | |
3753 | * specific app, the session failed so lets continue here. | |
3754 | */ | |
3755 | continue; | |
3756 | case -ENOMEM: | |
3757 | default: | |
3758 | goto error_rcu_unlock; | |
3759 | } | |
48842b30 | 3760 | } |
3d8ca23b | 3761 | assert(ua_sess); |
48842b30 | 3762 | |
d0b96690 | 3763 | pthread_mutex_lock(&ua_sess->lock); |
d65d2de8 DG |
3764 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, |
3765 | sizeof(uchan->name))) { | |
ad7a9107 DG |
3766 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, &uchan->attr); |
3767 | ret = 0; | |
d65d2de8 DG |
3768 | } else { |
3769 | /* Create channel onto application. We don't need the chan ref. */ | |
3770 | ret = create_ust_app_channel(ua_sess, uchan, app, | |
3771 | LTTNG_UST_CHAN_PER_CPU, usess, NULL); | |
3772 | } | |
d0b96690 | 3773 | pthread_mutex_unlock(&ua_sess->lock); |
3d8ca23b DG |
3774 | if (ret < 0) { |
3775 | if (ret == -ENOMEM) { | |
3776 | /* No more memory is a fatal error. Stop right now. */ | |
3777 | goto error_rcu_unlock; | |
3778 | } | |
3779 | /* Cleanup the created session if it's the case. */ | |
3780 | if (created) { | |
d0b96690 | 3781 | destroy_app_session(app, ua_sess); |
3d8ca23b | 3782 | } |
48842b30 | 3783 | } |
48842b30 | 3784 | } |
5b4a0ec0 | 3785 | |
95e047ff | 3786 | error_rcu_unlock: |
48842b30 | 3787 | rcu_read_unlock(); |
3c14c33f | 3788 | return ret; |
48842b30 DG |
3789 | } |
3790 | ||
5b4a0ec0 | 3791 | /* |
edb67388 | 3792 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 3793 | */ |
35a9059d | 3794 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3795 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3796 | { | |
3797 | int ret = 0; | |
bec39940 | 3798 | struct lttng_ht_iter iter, uiter; |
18eace3b | 3799 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
3800 | struct ust_app *app; |
3801 | struct ust_app_session *ua_sess; | |
3802 | struct ust_app_channel *ua_chan; | |
3803 | struct ust_app_event *ua_event; | |
48842b30 | 3804 | |
d9bf3ca4 | 3805 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 3806 | uevent->attr.name, usess->id); |
48842b30 | 3807 | |
edb67388 DG |
3808 | /* |
3809 | * NOTE: At this point, this function is called only if the session and | |
3810 | * channel passed are already created for all apps. and enabled on the | |
3811 | * tracer also. | |
3812 | */ | |
3813 | ||
48842b30 | 3814 | rcu_read_lock(); |
421cb601 DG |
3815 | |
3816 | /* For all registered applications */ | |
852d0037 | 3817 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3818 | if (!app->compatible) { |
3819 | /* | |
3820 | * TODO: In time, we should notice the caller of this error by | |
3821 | * telling him that this is a version error. | |
3822 | */ | |
3823 | continue; | |
3824 | } | |
edb67388 | 3825 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3826 | if (!ua_sess) { |
3827 | /* The application has problem or is probably dead. */ | |
3828 | continue; | |
3829 | } | |
ba767faf | 3830 | |
d0b96690 DG |
3831 | pthread_mutex_lock(&ua_sess->lock); |
3832 | ||
edb67388 | 3833 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3834 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3835 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3836 | /* If the channel is not found, there is a code flow error */ |
3837 | assert(ua_chan_node); | |
3838 | ||
3839 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3840 | ||
18eace3b DG |
3841 | /* Get event node */ |
3842 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
39c5a3a7 | 3843 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 3844 | if (ua_event == NULL) { |
7f79d3a1 | 3845 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 3846 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 3847 | goto next_app; |
35a9059d | 3848 | } |
35a9059d DG |
3849 | |
3850 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
3851 | if (ret < 0) { | |
d0b96690 | 3852 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 3853 | goto error; |
48842b30 | 3854 | } |
d0b96690 DG |
3855 | next_app: |
3856 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
3857 | } |
3858 | ||
7f79d3a1 | 3859 | error: |
edb67388 | 3860 | rcu_read_unlock(); |
edb67388 DG |
3861 | return ret; |
3862 | } | |
3863 | ||
3864 | /* | |
3865 | * For a specific existing UST session and UST channel, creates the event for | |
3866 | * all registered apps. | |
3867 | */ | |
35a9059d | 3868 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
3869 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3870 | { | |
3871 | int ret = 0; | |
bec39940 DG |
3872 | struct lttng_ht_iter iter, uiter; |
3873 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
3874 | struct ust_app *app; |
3875 | struct ust_app_session *ua_sess; | |
3876 | struct ust_app_channel *ua_chan; | |
3877 | ||
d9bf3ca4 | 3878 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 3879 | uevent->attr.name, usess->id); |
edb67388 | 3880 | |
edb67388 DG |
3881 | rcu_read_lock(); |
3882 | ||
3883 | /* For all registered applications */ | |
852d0037 | 3884 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3885 | if (!app->compatible) { |
3886 | /* | |
3887 | * TODO: In time, we should notice the caller of this error by | |
3888 | * telling him that this is a version error. | |
3889 | */ | |
3890 | continue; | |
3891 | } | |
edb67388 | 3892 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3893 | if (!ua_sess) { |
3894 | /* The application has problem or is probably dead. */ | |
3895 | continue; | |
3896 | } | |
48842b30 | 3897 | |
d0b96690 | 3898 | pthread_mutex_lock(&ua_sess->lock); |
48842b30 | 3899 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3900 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3901 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3902 | /* If the channel is not found, there is a code flow error */ |
3903 | assert(ua_chan_node); | |
3904 | ||
48842b30 DG |
3905 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3906 | ||
edb67388 | 3907 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 3908 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 3909 | if (ret < 0) { |
49c336c1 | 3910 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
3911 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
3912 | break; | |
3913 | } | |
3914 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 3915 | uevent->attr.name, app->pid); |
5b4a0ec0 | 3916 | continue; |
48842b30 | 3917 | } |
48842b30 | 3918 | } |
5b4a0ec0 | 3919 | |
48842b30 DG |
3920 | rcu_read_unlock(); |
3921 | ||
3922 | return ret; | |
3923 | } | |
3924 | ||
5b4a0ec0 DG |
3925 | /* |
3926 | * Start tracing for a specific UST session and app. | |
3927 | */ | |
b34cbebf | 3928 | static |
421cb601 | 3929 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
3930 | { |
3931 | int ret = 0; | |
48842b30 | 3932 | struct ust_app_session *ua_sess; |
48842b30 | 3933 | |
852d0037 | 3934 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 3935 | |
509cbaf8 MD |
3936 | rcu_read_lock(); |
3937 | ||
e0c7ec2b DG |
3938 | if (!app->compatible) { |
3939 | goto end; | |
3940 | } | |
3941 | ||
421cb601 DG |
3942 | ua_sess = lookup_session_by_app(usess, app); |
3943 | if (ua_sess == NULL) { | |
d42f20df DG |
3944 | /* The session is in teardown process. Ignore and continue. */ |
3945 | goto end; | |
421cb601 | 3946 | } |
48842b30 | 3947 | |
d0b96690 DG |
3948 | pthread_mutex_lock(&ua_sess->lock); |
3949 | ||
aea829b3 DG |
3950 | /* Upon restart, we skip the setup, already done */ |
3951 | if (ua_sess->started) { | |
8be98f9a | 3952 | goto skip_setup; |
aea829b3 | 3953 | } |
8be98f9a | 3954 | |
a4b92340 DG |
3955 | /* Create directories if consumer is LOCAL and has a path defined. */ |
3956 | if (usess->consumer->type == CONSUMER_DST_LOCAL && | |
3957 | strlen(usess->consumer->dst.trace_path) > 0) { | |
3958 | ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path, | |
7972aab2 | 3959 | S_IRWXU | S_IRWXG, ua_sess->euid, ua_sess->egid); |
a4b92340 DG |
3960 | if (ret < 0) { |
3961 | if (ret != -EEXIST) { | |
3962 | ERR("Trace directory creation error"); | |
d0b96690 | 3963 | goto error_unlock; |
421cb601 | 3964 | } |
173af62f | 3965 | } |
7753dea8 | 3966 | } |
aea829b3 | 3967 | |
d65d2de8 DG |
3968 | /* |
3969 | * Create the metadata for the application. This returns gracefully if a | |
3970 | * metadata was already set for the session. | |
3971 | */ | |
ad7a9107 | 3972 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer); |
421cb601 | 3973 | if (ret < 0) { |
d0b96690 | 3974 | goto error_unlock; |
421cb601 | 3975 | } |
48842b30 | 3976 | |
840cb59c | 3977 | health_code_update(); |
86acf0da | 3978 | |
8be98f9a | 3979 | skip_setup: |
421cb601 | 3980 | /* This start the UST tracing */ |
852d0037 | 3981 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
421cb601 | 3982 | if (ret < 0) { |
ffe60014 DG |
3983 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3984 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
3985 | app->pid, ret); | |
3986 | } else { | |
3987 | DBG("UST app start session failed. Application is dead."); | |
3757b385 DG |
3988 | /* |
3989 | * This is normal behavior, an application can die during the | |
3990 | * creation process. Don't report an error so the execution can | |
3991 | * continue normally. | |
3992 | */ | |
3993 | pthread_mutex_unlock(&ua_sess->lock); | |
3994 | goto end; | |
ffe60014 | 3995 | } |
d0b96690 | 3996 | goto error_unlock; |
421cb601 | 3997 | } |
5b4a0ec0 | 3998 | |
55c3953d DG |
3999 | /* Indicate that the session has been started once */ |
4000 | ua_sess->started = 1; | |
4001 | ||
d0b96690 DG |
4002 | pthread_mutex_unlock(&ua_sess->lock); |
4003 | ||
840cb59c | 4004 | health_code_update(); |
86acf0da | 4005 | |
421cb601 | 4006 | /* Quiescent wait after starting trace */ |
ffe60014 DG |
4007 | ret = ustctl_wait_quiescent(app->sock); |
4008 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4009 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4010 | app->pid, ret); | |
4011 | } | |
48842b30 | 4012 | |
e0c7ec2b DG |
4013 | end: |
4014 | rcu_read_unlock(); | |
840cb59c | 4015 | health_code_update(); |
421cb601 | 4016 | return 0; |
48842b30 | 4017 | |
d0b96690 DG |
4018 | error_unlock: |
4019 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 4020 | rcu_read_unlock(); |
840cb59c | 4021 | health_code_update(); |
421cb601 DG |
4022 | return -1; |
4023 | } | |
48842b30 | 4024 | |
8be98f9a MD |
4025 | /* |
4026 | * Stop tracing for a specific UST session and app. | |
4027 | */ | |
b34cbebf | 4028 | static |
8be98f9a MD |
4029 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
4030 | { | |
4031 | int ret = 0; | |
4032 | struct ust_app_session *ua_sess; | |
7972aab2 | 4033 | struct ust_registry_session *registry; |
8be98f9a | 4034 | |
852d0037 | 4035 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
4036 | |
4037 | rcu_read_lock(); | |
4038 | ||
e0c7ec2b | 4039 | if (!app->compatible) { |
d88aee68 | 4040 | goto end_no_session; |
e0c7ec2b DG |
4041 | } |
4042 | ||
8be98f9a MD |
4043 | ua_sess = lookup_session_by_app(usess, app); |
4044 | if (ua_sess == NULL) { | |
d88aee68 | 4045 | goto end_no_session; |
8be98f9a MD |
4046 | } |
4047 | ||
d88aee68 DG |
4048 | pthread_mutex_lock(&ua_sess->lock); |
4049 | ||
9bc07046 DG |
4050 | /* |
4051 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
4052 | * that was never started. It's possible since we can have a fail start |
4053 | * from either the application manager thread or the command thread. Simply | |
4054 | * indicate that this is a stop error. | |
9bc07046 | 4055 | */ |
f9dfc3d9 | 4056 | if (!ua_sess->started) { |
c45536e1 DG |
4057 | goto error_rcu_unlock; |
4058 | } | |
7db205b5 | 4059 | |
840cb59c | 4060 | health_code_update(); |
86acf0da | 4061 | |
9d6c7d3f | 4062 | /* This inhibits UST tracing */ |
852d0037 | 4063 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
9d6c7d3f | 4064 | if (ret < 0) { |
ffe60014 DG |
4065 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4066 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
4067 | app->pid, ret); | |
4068 | } else { | |
4069 | DBG("UST app stop session failed. Application is dead."); | |
3757b385 DG |
4070 | /* |
4071 | * This is normal behavior, an application can die during the | |
4072 | * creation process. Don't report an error so the execution can | |
4073 | * continue normally. | |
4074 | */ | |
4075 | goto end_unlock; | |
ffe60014 | 4076 | } |
9d6c7d3f DG |
4077 | goto error_rcu_unlock; |
4078 | } | |
4079 | ||
840cb59c | 4080 | health_code_update(); |
86acf0da | 4081 | |
9d6c7d3f | 4082 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
4083 | ret = ustctl_wait_quiescent(app->sock); |
4084 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4085 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4086 | app->pid, ret); | |
4087 | } | |
9d6c7d3f | 4088 | |
840cb59c | 4089 | health_code_update(); |
86acf0da | 4090 | |
b34cbebf MD |
4091 | registry = get_session_registry(ua_sess); |
4092 | assert(registry); | |
1b532a60 | 4093 | |
ce34fcd0 MD |
4094 | /* Push metadata for application before freeing the application. */ |
4095 | (void) push_metadata(registry, ua_sess->consumer); | |
b34cbebf | 4096 | |
3757b385 | 4097 | end_unlock: |
b34cbebf MD |
4098 | pthread_mutex_unlock(&ua_sess->lock); |
4099 | end_no_session: | |
4100 | rcu_read_unlock(); | |
4101 | health_code_update(); | |
4102 | return 0; | |
4103 | ||
4104 | error_rcu_unlock: | |
4105 | pthread_mutex_unlock(&ua_sess->lock); | |
4106 | rcu_read_unlock(); | |
4107 | health_code_update(); | |
4108 | return -1; | |
4109 | } | |
4110 | ||
b34cbebf | 4111 | static |
c4b88406 MD |
4112 | int ust_app_flush_app_session(struct ust_app *app, |
4113 | struct ust_app_session *ua_sess) | |
b34cbebf | 4114 | { |
c4b88406 | 4115 | int ret, retval = 0; |
b34cbebf | 4116 | struct lttng_ht_iter iter; |
b34cbebf | 4117 | struct ust_app_channel *ua_chan; |
c4b88406 | 4118 | struct consumer_socket *socket; |
b34cbebf | 4119 | |
c4b88406 | 4120 | DBG("Flushing app session buffers for ust app pid %d", app->pid); |
b34cbebf MD |
4121 | |
4122 | rcu_read_lock(); | |
4123 | ||
4124 | if (!app->compatible) { | |
c4b88406 | 4125 | goto end_not_compatible; |
b34cbebf MD |
4126 | } |
4127 | ||
4128 | pthread_mutex_lock(&ua_sess->lock); | |
4129 | ||
4130 | health_code_update(); | |
4131 | ||
9d6c7d3f | 4132 | /* Flushing buffers */ |
c4b88406 MD |
4133 | socket = consumer_find_socket_by_bitness(app->bits_per_long, |
4134 | ua_sess->consumer); | |
ce34fcd0 MD |
4135 | |
4136 | /* Flush buffers and push metadata. */ | |
4137 | switch (ua_sess->buffer_type) { | |
4138 | case LTTNG_BUFFER_PER_PID: | |
4139 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, | |
4140 | node.node) { | |
4141 | health_code_update(); | |
4142 | assert(ua_chan->is_sent); | |
4143 | ret = consumer_flush_channel(socket, ua_chan->key); | |
4144 | if (ret) { | |
4145 | ERR("Error flushing consumer channel"); | |
4146 | retval = -1; | |
4147 | continue; | |
4148 | } | |
8be98f9a | 4149 | } |
ce34fcd0 MD |
4150 | break; |
4151 | case LTTNG_BUFFER_PER_UID: | |
4152 | default: | |
4153 | assert(0); | |
4154 | break; | |
8be98f9a | 4155 | } |
8be98f9a | 4156 | |
840cb59c | 4157 | health_code_update(); |
86acf0da | 4158 | |
d88aee68 | 4159 | pthread_mutex_unlock(&ua_sess->lock); |
ce34fcd0 | 4160 | |
c4b88406 MD |
4161 | end_not_compatible: |
4162 | rcu_read_unlock(); | |
4163 | health_code_update(); | |
4164 | return retval; | |
4165 | } | |
4166 | ||
4167 | /* | |
ce34fcd0 MD |
4168 | * Flush buffers for all applications for a specific UST session. |
4169 | * Called with UST session lock held. | |
c4b88406 MD |
4170 | */ |
4171 | static | |
ce34fcd0 | 4172 | int ust_app_flush_session(struct ltt_ust_session *usess) |
c4b88406 MD |
4173 | |
4174 | { | |
99b1411c | 4175 | int ret = 0; |
c4b88406 | 4176 | |
ce34fcd0 | 4177 | DBG("Flushing session buffers for all ust apps"); |
c4b88406 MD |
4178 | |
4179 | rcu_read_lock(); | |
4180 | ||
ce34fcd0 MD |
4181 | /* Flush buffers and push metadata. */ |
4182 | switch (usess->buffer_type) { | |
4183 | case LTTNG_BUFFER_PER_UID: | |
4184 | { | |
4185 | struct buffer_reg_uid *reg; | |
4186 | struct lttng_ht_iter iter; | |
4187 | ||
4188 | /* Flush all per UID buffers associated to that session. */ | |
4189 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
4190 | struct ust_registry_session *ust_session_reg; | |
4191 | struct buffer_reg_channel *reg_chan; | |
4192 | struct consumer_socket *socket; | |
4193 | ||
4194 | /* Get consumer socket to use to push the metadata.*/ | |
4195 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
4196 | usess->consumer); | |
4197 | if (!socket) { | |
4198 | /* Ignore request if no consumer is found for the session. */ | |
4199 | continue; | |
4200 | } | |
4201 | ||
4202 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
4203 | reg_chan, node.node) { | |
4204 | /* | |
4205 | * The following call will print error values so the return | |
4206 | * code is of little importance because whatever happens, we | |
4207 | * have to try them all. | |
4208 | */ | |
4209 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
4210 | } | |
4211 | ||
4212 | ust_session_reg = reg->registry->reg.ust; | |
4213 | /* Push metadata. */ | |
4214 | (void) push_metadata(ust_session_reg, usess->consumer); | |
4215 | } | |
ce34fcd0 MD |
4216 | break; |
4217 | } | |
4218 | case LTTNG_BUFFER_PER_PID: | |
4219 | { | |
4220 | struct ust_app_session *ua_sess; | |
4221 | struct lttng_ht_iter iter; | |
4222 | struct ust_app *app; | |
4223 | ||
4224 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4225 | ua_sess = lookup_session_by_app(usess, app); | |
4226 | if (ua_sess == NULL) { | |
4227 | continue; | |
4228 | } | |
4229 | (void) ust_app_flush_app_session(app, ua_sess); | |
4230 | } | |
4231 | break; | |
4232 | } | |
4233 | default: | |
99b1411c | 4234 | ret = -1; |
ce34fcd0 MD |
4235 | assert(0); |
4236 | break; | |
c4b88406 | 4237 | } |
c4b88406 | 4238 | |
7db205b5 | 4239 | rcu_read_unlock(); |
840cb59c | 4240 | health_code_update(); |
c4b88406 | 4241 | return ret; |
8be98f9a MD |
4242 | } |
4243 | ||
84cd17c6 MD |
4244 | /* |
4245 | * Destroy a specific UST session in apps. | |
4246 | */ | |
3353de95 | 4247 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 4248 | { |
ffe60014 | 4249 | int ret; |
84cd17c6 | 4250 | struct ust_app_session *ua_sess; |
bec39940 | 4251 | struct lttng_ht_iter iter; |
d9bf3ca4 | 4252 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 4253 | |
852d0037 | 4254 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
4255 | |
4256 | rcu_read_lock(); | |
4257 | ||
e0c7ec2b DG |
4258 | if (!app->compatible) { |
4259 | goto end; | |
4260 | } | |
4261 | ||
84cd17c6 | 4262 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 4263 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 4264 | if (node == NULL) { |
d42f20df DG |
4265 | /* Session is being or is deleted. */ |
4266 | goto end; | |
84cd17c6 MD |
4267 | } |
4268 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 4269 | |
840cb59c | 4270 | health_code_update(); |
d0b96690 | 4271 | destroy_app_session(app, ua_sess); |
84cd17c6 | 4272 | |
840cb59c | 4273 | health_code_update(); |
7db205b5 | 4274 | |
84cd17c6 | 4275 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
4276 | ret = ustctl_wait_quiescent(app->sock); |
4277 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4278 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4279 | app->pid, ret); | |
4280 | } | |
e0c7ec2b DG |
4281 | end: |
4282 | rcu_read_unlock(); | |
840cb59c | 4283 | health_code_update(); |
84cd17c6 | 4284 | return 0; |
84cd17c6 MD |
4285 | } |
4286 | ||
5b4a0ec0 DG |
4287 | /* |
4288 | * Start tracing for the UST session. | |
4289 | */ | |
421cb601 DG |
4290 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
4291 | { | |
4292 | int ret = 0; | |
bec39940 | 4293 | struct lttng_ht_iter iter; |
421cb601 | 4294 | struct ust_app *app; |
48842b30 | 4295 | |
421cb601 DG |
4296 | DBG("Starting all UST traces"); |
4297 | ||
4298 | rcu_read_lock(); | |
421cb601 | 4299 | |
852d0037 | 4300 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
421cb601 | 4301 | ret = ust_app_start_trace(usess, app); |
48842b30 | 4302 | if (ret < 0) { |
5b4a0ec0 DG |
4303 | /* Continue to next apps even on error */ |
4304 | continue; | |
48842b30 | 4305 | } |
48842b30 | 4306 | } |
5b4a0ec0 | 4307 | |
48842b30 DG |
4308 | rcu_read_unlock(); |
4309 | ||
4310 | return 0; | |
4311 | } | |
487cf67c | 4312 | |
8be98f9a MD |
4313 | /* |
4314 | * Start tracing for the UST session. | |
ce34fcd0 | 4315 | * Called with UST session lock held. |
8be98f9a MD |
4316 | */ |
4317 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
4318 | { | |
4319 | int ret = 0; | |
bec39940 | 4320 | struct lttng_ht_iter iter; |
8be98f9a MD |
4321 | struct ust_app *app; |
4322 | ||
4323 | DBG("Stopping all UST traces"); | |
4324 | ||
4325 | rcu_read_lock(); | |
4326 | ||
b34cbebf MD |
4327 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4328 | ret = ust_app_stop_trace(usess, app); | |
4329 | if (ret < 0) { | |
4330 | /* Continue to next apps even on error */ | |
4331 | continue; | |
4332 | } | |
4333 | } | |
4334 | ||
ce34fcd0 | 4335 | (void) ust_app_flush_session(usess); |
8be98f9a MD |
4336 | |
4337 | rcu_read_unlock(); | |
4338 | ||
4339 | return 0; | |
4340 | } | |
4341 | ||
84cd17c6 MD |
4342 | /* |
4343 | * Destroy app UST session. | |
4344 | */ | |
4345 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
4346 | { | |
4347 | int ret = 0; | |
bec39940 | 4348 | struct lttng_ht_iter iter; |
84cd17c6 MD |
4349 | struct ust_app *app; |
4350 | ||
4351 | DBG("Destroy all UST traces"); | |
4352 | ||
4353 | rcu_read_lock(); | |
4354 | ||
852d0037 | 4355 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 4356 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
4357 | if (ret < 0) { |
4358 | /* Continue to next apps even on error */ | |
4359 | continue; | |
4360 | } | |
4361 | } | |
4362 | ||
4363 | rcu_read_unlock(); | |
4364 | ||
4365 | return 0; | |
4366 | } | |
4367 | ||
a9ad0c8f MD |
4368 | static |
4369 | void ust_app_global_create(struct ltt_ust_session *usess, struct ust_app *app) | |
487cf67c | 4370 | { |
55c54cce | 4371 | int ret = 0; |
31746f93 | 4372 | struct lttng_ht_iter iter, uiter; |
3d8ca23b | 4373 | struct ust_app_session *ua_sess = NULL; |
487cf67c DG |
4374 | struct ust_app_channel *ua_chan; |
4375 | struct ust_app_event *ua_event; | |
727d5404 | 4376 | struct ust_app_ctx *ua_ctx; |
a9ad0c8f | 4377 | int is_created = 0; |
1f3580c7 | 4378 | |
a9ad0c8f | 4379 | ret = create_ust_app_session(usess, app, &ua_sess, &is_created); |
3d8ca23b DG |
4380 | if (ret < 0) { |
4381 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
4382 | goto error; |
4383 | } | |
a9ad0c8f MD |
4384 | if (!is_created) { |
4385 | /* App session already created. */ | |
4386 | goto end; | |
4387 | } | |
3d8ca23b | 4388 | assert(ua_sess); |
487cf67c | 4389 | |
d0b96690 DG |
4390 | pthread_mutex_lock(&ua_sess->lock); |
4391 | ||
284d8f55 | 4392 | /* |
d0b96690 | 4393 | * We can iterate safely here over all UST app session since the create ust |
284d8f55 DG |
4394 | * app session above made a shadow copy of the UST global domain from the |
4395 | * ltt ust session. | |
4396 | */ | |
bec39940 DG |
4397 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
4398 | node.node) { | |
ad7a9107 DG |
4399 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
4400 | if (ret < 0) { | |
4401 | /* | |
4402 | * Stop everything. On error, the application failed, no more | |
4403 | * file descriptor are available or ENOMEM so stopping here is | |
4404 | * the only thing we can do for now. | |
4405 | */ | |
4406 | goto error_unlock; | |
487cf67c DG |
4407 | } |
4408 | ||
31746f93 DG |
4409 | /* |
4410 | * Add context using the list so they are enabled in the same order the | |
4411 | * user added them. | |
4412 | */ | |
4413 | cds_list_for_each_entry(ua_ctx, &ua_chan->ctx_list, list) { | |
727d5404 DG |
4414 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); |
4415 | if (ret < 0) { | |
d0b96690 | 4416 | goto error_unlock; |
727d5404 DG |
4417 | } |
4418 | } | |
4419 | ||
4420 | ||
284d8f55 | 4421 | /* For each events */ |
bec39940 DG |
4422 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
4423 | node.node) { | |
284d8f55 DG |
4424 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
4425 | if (ret < 0) { | |
d0b96690 | 4426 | goto error_unlock; |
487cf67c | 4427 | } |
36dc12cc | 4428 | } |
487cf67c DG |
4429 | } |
4430 | ||
d0b96690 DG |
4431 | pthread_mutex_unlock(&ua_sess->lock); |
4432 | ||
14fb1ebe | 4433 | if (usess->active) { |
421cb601 | 4434 | ret = ust_app_start_trace(usess, app); |
36dc12cc | 4435 | if (ret < 0) { |
36dc12cc DG |
4436 | goto error; |
4437 | } | |
4438 | ||
852d0037 | 4439 | DBG2("UST trace started for app pid %d", app->pid); |
36dc12cc | 4440 | } |
a9ad0c8f | 4441 | end: |
ffe60014 | 4442 | /* Everything went well at this point. */ |
ffe60014 DG |
4443 | return; |
4444 | ||
d0b96690 DG |
4445 | error_unlock: |
4446 | pthread_mutex_unlock(&ua_sess->lock); | |
487cf67c | 4447 | error: |
ffe60014 | 4448 | if (ua_sess) { |
d0b96690 | 4449 | destroy_app_session(app, ua_sess); |
ffe60014 | 4450 | } |
487cf67c DG |
4451 | return; |
4452 | } | |
55cc08a6 | 4453 | |
a9ad0c8f MD |
4454 | static |
4455 | void ust_app_global_destroy(struct ltt_ust_session *usess, struct ust_app *app) | |
4456 | { | |
4457 | struct ust_app_session *ua_sess; | |
4458 | ||
4459 | ua_sess = lookup_session_by_app(usess, app); | |
4460 | if (ua_sess == NULL) { | |
4461 | return; | |
4462 | } | |
4463 | destroy_app_session(app, ua_sess); | |
4464 | } | |
4465 | ||
4466 | /* | |
4467 | * Add channels/events from UST global domain to registered apps at sock. | |
4468 | * | |
4469 | * Called with session lock held. | |
4470 | * Called with RCU read-side lock held. | |
4471 | */ | |
4472 | void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app) | |
4473 | { | |
4474 | assert(usess); | |
4475 | ||
4476 | DBG2("UST app global update for app sock %d for session id %" PRIu64, | |
4477 | app->sock, usess->id); | |
4478 | ||
4479 | if (!app->compatible) { | |
4480 | return; | |
4481 | } | |
4482 | ||
4483 | if (trace_ust_pid_tracker_lookup(usess, app->pid)) { | |
4484 | ust_app_global_create(usess, app); | |
4485 | } else { | |
4486 | ust_app_global_destroy(usess, app); | |
4487 | } | |
4488 | } | |
4489 | ||
4490 | /* | |
4491 | * Called with session lock held. | |
4492 | */ | |
4493 | void ust_app_global_update_all(struct ltt_ust_session *usess) | |
4494 | { | |
4495 | struct lttng_ht_iter iter; | |
4496 | struct ust_app *app; | |
4497 | ||
4498 | rcu_read_lock(); | |
4499 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4500 | ust_app_global_update(usess, app); | |
4501 | } | |
4502 | rcu_read_unlock(); | |
4503 | } | |
4504 | ||
55cc08a6 DG |
4505 | /* |
4506 | * Add context to a specific channel for global UST domain. | |
4507 | */ | |
4508 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
4509 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
4510 | { | |
4511 | int ret = 0; | |
bec39940 DG |
4512 | struct lttng_ht_node_str *ua_chan_node; |
4513 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
4514 | struct ust_app_channel *ua_chan = NULL; |
4515 | struct ust_app_session *ua_sess; | |
4516 | struct ust_app *app; | |
4517 | ||
4518 | rcu_read_lock(); | |
4519 | ||
852d0037 | 4520 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4521 | if (!app->compatible) { |
4522 | /* | |
4523 | * TODO: In time, we should notice the caller of this error by | |
4524 | * telling him that this is a version error. | |
4525 | */ | |
4526 | continue; | |
4527 | } | |
55cc08a6 DG |
4528 | ua_sess = lookup_session_by_app(usess, app); |
4529 | if (ua_sess == NULL) { | |
4530 | continue; | |
4531 | } | |
4532 | ||
d0b96690 | 4533 | pthread_mutex_lock(&ua_sess->lock); |
55cc08a6 | 4534 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4535 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4536 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 4537 | if (ua_chan_node == NULL) { |
d0b96690 | 4538 | goto next_app; |
55cc08a6 DG |
4539 | } |
4540 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
4541 | node); | |
55cc08a6 DG |
4542 | ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app); |
4543 | if (ret < 0) { | |
d0b96690 | 4544 | goto next_app; |
55cc08a6 | 4545 | } |
d0b96690 DG |
4546 | next_app: |
4547 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
4548 | } |
4549 | ||
55cc08a6 DG |
4550 | rcu_read_unlock(); |
4551 | return ret; | |
4552 | } | |
4553 | ||
76d45b40 DG |
4554 | /* |
4555 | * Enable event for a channel from a UST session for a specific PID. | |
4556 | */ | |
4557 | int ust_app_enable_event_pid(struct ltt_ust_session *usess, | |
4558 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4559 | { | |
4560 | int ret = 0; | |
bec39940 | 4561 | struct lttng_ht_iter iter; |
18eace3b | 4562 | struct lttng_ht_node_str *ua_chan_node; |
76d45b40 DG |
4563 | struct ust_app *app; |
4564 | struct ust_app_session *ua_sess; | |
4565 | struct ust_app_channel *ua_chan; | |
4566 | struct ust_app_event *ua_event; | |
4567 | ||
4568 | DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid); | |
4569 | ||
4570 | rcu_read_lock(); | |
4571 | ||
4572 | app = ust_app_find_by_pid(pid); | |
4573 | if (app == NULL) { | |
4574 | ERR("UST app enable event per PID %d not found", pid); | |
4575 | ret = -1; | |
d0b96690 | 4576 | goto end; |
76d45b40 DG |
4577 | } |
4578 | ||
e0c7ec2b DG |
4579 | if (!app->compatible) { |
4580 | ret = 0; | |
d0b96690 | 4581 | goto end; |
e0c7ec2b DG |
4582 | } |
4583 | ||
76d45b40 | 4584 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4585 | if (!ua_sess) { |
4586 | /* The application has problem or is probably dead. */ | |
d0b96690 DG |
4587 | ret = 0; |
4588 | goto end; | |
c4a1715b | 4589 | } |
76d45b40 | 4590 | |
d0b96690 | 4591 | pthread_mutex_lock(&ua_sess->lock); |
76d45b40 | 4592 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4593 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4594 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
76d45b40 DG |
4595 | /* If the channel is not found, there is a code flow error */ |
4596 | assert(ua_chan_node); | |
4597 | ||
4598 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4599 | ||
18eace3b | 4600 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 4601 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 4602 | if (ua_event == NULL) { |
76d45b40 DG |
4603 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
4604 | if (ret < 0) { | |
d0b96690 | 4605 | goto end_unlock; |
76d45b40 DG |
4606 | } |
4607 | } else { | |
76d45b40 DG |
4608 | ret = enable_ust_app_event(ua_sess, ua_event, app); |
4609 | if (ret < 0) { | |
d0b96690 | 4610 | goto end_unlock; |
76d45b40 DG |
4611 | } |
4612 | } | |
4613 | ||
d0b96690 DG |
4614 | end_unlock: |
4615 | pthread_mutex_unlock(&ua_sess->lock); | |
4616 | end: | |
76d45b40 DG |
4617 | rcu_read_unlock(); |
4618 | return ret; | |
4619 | } | |
7f79d3a1 | 4620 | |
4466912f DG |
4621 | /* |
4622 | * Calibrate registered applications. | |
4623 | */ | |
4624 | int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate) | |
4625 | { | |
4626 | int ret = 0; | |
4627 | struct lttng_ht_iter iter; | |
4628 | struct ust_app *app; | |
4629 | ||
4630 | rcu_read_lock(); | |
4631 | ||
852d0037 | 4632 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4466912f DG |
4633 | if (!app->compatible) { |
4634 | /* | |
4635 | * TODO: In time, we should notice the caller of this error by | |
4636 | * telling him that this is a version error. | |
4637 | */ | |
4638 | continue; | |
4639 | } | |
4640 | ||
840cb59c | 4641 | health_code_update(); |
86acf0da | 4642 | |
852d0037 | 4643 | ret = ustctl_calibrate(app->sock, calibrate); |
4466912f DG |
4644 | if (ret < 0) { |
4645 | switch (ret) { | |
4646 | case -ENOSYS: | |
4647 | /* Means that it's not implemented on the tracer side. */ | |
4648 | ret = 0; | |
4649 | break; | |
4650 | default: | |
4466912f | 4651 | DBG2("Calibrate app PID %d returned with error %d", |
852d0037 | 4652 | app->pid, ret); |
4466912f DG |
4653 | break; |
4654 | } | |
4655 | } | |
4656 | } | |
4657 | ||
4658 | DBG("UST app global domain calibration finished"); | |
4659 | ||
4660 | rcu_read_unlock(); | |
4661 | ||
840cb59c | 4662 | health_code_update(); |
86acf0da | 4663 | |
4466912f DG |
4664 | return ret; |
4665 | } | |
d0b96690 DG |
4666 | |
4667 | /* | |
4668 | * Receive registration and populate the given msg structure. | |
4669 | * | |
4670 | * On success return 0 else a negative value returned by the ustctl call. | |
4671 | */ | |
4672 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
4673 | { | |
4674 | int ret; | |
4675 | uint32_t pid, ppid, uid, gid; | |
4676 | ||
4677 | assert(msg); | |
4678 | ||
4679 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
4680 | &pid, &ppid, &uid, &gid, | |
4681 | &msg->bits_per_long, | |
4682 | &msg->uint8_t_alignment, | |
4683 | &msg->uint16_t_alignment, | |
4684 | &msg->uint32_t_alignment, | |
4685 | &msg->uint64_t_alignment, | |
4686 | &msg->long_alignment, | |
4687 | &msg->byte_order, | |
4688 | msg->name); | |
4689 | if (ret < 0) { | |
4690 | switch (-ret) { | |
4691 | case EPIPE: | |
4692 | case ECONNRESET: | |
4693 | case LTTNG_UST_ERR_EXITING: | |
4694 | DBG3("UST app recv reg message failed. Application died"); | |
4695 | break; | |
4696 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
4697 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
4698 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
4699 | LTTNG_UST_ABI_MINOR_VERSION); | |
4700 | break; | |
4701 | default: | |
4702 | ERR("UST app recv reg message failed with ret %d", ret); | |
4703 | break; | |
4704 | } | |
4705 | goto error; | |
4706 | } | |
4707 | msg->pid = (pid_t) pid; | |
4708 | msg->ppid = (pid_t) ppid; | |
4709 | msg->uid = (uid_t) uid; | |
4710 | msg->gid = (gid_t) gid; | |
4711 | ||
4712 | error: | |
4713 | return ret; | |
4714 | } | |
4715 | ||
d88aee68 DG |
4716 | /* |
4717 | * Return a ust app channel object using the application object and the channel | |
4718 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
4719 | * lock MUST be acquired before calling this function. | |
4720 | */ | |
d0b96690 DG |
4721 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
4722 | int objd) | |
4723 | { | |
4724 | struct lttng_ht_node_ulong *node; | |
4725 | struct lttng_ht_iter iter; | |
4726 | struct ust_app_channel *ua_chan = NULL; | |
4727 | ||
4728 | assert(app); | |
4729 | ||
4730 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
4731 | node = lttng_ht_iter_get_node_ulong(&iter); | |
4732 | if (node == NULL) { | |
4733 | DBG2("UST app channel find by objd %d not found", objd); | |
4734 | goto error; | |
4735 | } | |
4736 | ||
4737 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
4738 | ||
4739 | error: | |
4740 | return ua_chan; | |
4741 | } | |
4742 | ||
d88aee68 DG |
4743 | /* |
4744 | * Reply to a register channel notification from an application on the notify | |
4745 | * socket. The channel metadata is also created. | |
4746 | * | |
4747 | * The session UST registry lock is acquired in this function. | |
4748 | * | |
4749 | * On success 0 is returned else a negative value. | |
4750 | */ | |
d0b96690 DG |
4751 | static int reply_ust_register_channel(int sock, int sobjd, int cobjd, |
4752 | size_t nr_fields, struct ustctl_field *fields) | |
4753 | { | |
4754 | int ret, ret_code = 0; | |
4755 | uint32_t chan_id, reg_count; | |
7972aab2 | 4756 | uint64_t chan_reg_key; |
d0b96690 DG |
4757 | enum ustctl_channel_header type; |
4758 | struct ust_app *app; | |
4759 | struct ust_app_channel *ua_chan; | |
4760 | struct ust_app_session *ua_sess; | |
7972aab2 | 4761 | struct ust_registry_session *registry; |
45893984 | 4762 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
4763 | |
4764 | rcu_read_lock(); | |
4765 | ||
4766 | /* Lookup application. If not found, there is a code flow error. */ | |
4767 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4768 | if (!app) { |
4769 | DBG("Application socket %d is being teardown. Abort event notify", | |
4770 | sock); | |
4771 | ret = 0; | |
d5d629b5 | 4772 | free(fields); |
d88aee68 DG |
4773 | goto error_rcu_unlock; |
4774 | } | |
d0b96690 | 4775 | |
4950b860 | 4776 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4777 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4778 | if (!ua_chan) { |
4779 | DBG("Application channel is being teardown. Abort event notify"); | |
4780 | ret = 0; | |
d5d629b5 | 4781 | free(fields); |
4950b860 MD |
4782 | goto error_rcu_unlock; |
4783 | } | |
4784 | ||
d0b96690 DG |
4785 | assert(ua_chan->session); |
4786 | ua_sess = ua_chan->session; | |
d0b96690 | 4787 | |
7972aab2 DG |
4788 | /* Get right session registry depending on the session buffer type. */ |
4789 | registry = get_session_registry(ua_sess); | |
4790 | assert(registry); | |
45893984 | 4791 | |
7972aab2 DG |
4792 | /* Depending on the buffer type, a different channel key is used. */ |
4793 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4794 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 4795 | } else { |
7972aab2 | 4796 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
4797 | } |
4798 | ||
7972aab2 DG |
4799 | pthread_mutex_lock(®istry->lock); |
4800 | ||
4801 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
4802 | assert(chan_reg); | |
4803 | ||
4804 | if (!chan_reg->register_done) { | |
4805 | reg_count = ust_registry_get_event_count(chan_reg); | |
4806 | if (reg_count < 31) { | |
4807 | type = USTCTL_CHANNEL_HEADER_COMPACT; | |
4808 | } else { | |
4809 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
4810 | } | |
4811 | ||
4812 | chan_reg->nr_ctx_fields = nr_fields; | |
4813 | chan_reg->ctx_fields = fields; | |
4814 | chan_reg->header_type = type; | |
d0b96690 | 4815 | } else { |
7972aab2 DG |
4816 | /* Get current already assigned values. */ |
4817 | type = chan_reg->header_type; | |
d5d629b5 DG |
4818 | free(fields); |
4819 | /* Set to NULL so the error path does not do a double free. */ | |
4820 | fields = NULL; | |
d0b96690 | 4821 | } |
7972aab2 DG |
4822 | /* Channel id is set during the object creation. */ |
4823 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
4824 | |
4825 | /* Append to metadata */ | |
7972aab2 DG |
4826 | if (!chan_reg->metadata_dumped) { |
4827 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
4828 | if (ret_code) { |
4829 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
4830 | goto reply; | |
4831 | } | |
4832 | } | |
4833 | ||
4834 | reply: | |
7972aab2 DG |
4835 | DBG3("UST app replying to register channel key %" PRIu64 |
4836 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
4837 | ret_code); | |
d0b96690 DG |
4838 | |
4839 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
4840 | if (ret < 0) { | |
4841 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4842 | ERR("UST app reply channel failed with ret %d", ret); | |
4843 | } else { | |
4844 | DBG3("UST app reply channel failed. Application died"); | |
4845 | } | |
4846 | goto error; | |
4847 | } | |
4848 | ||
7972aab2 DG |
4849 | /* This channel registry registration is completed. */ |
4850 | chan_reg->register_done = 1; | |
4851 | ||
d0b96690 | 4852 | error: |
7972aab2 | 4853 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4854 | error_rcu_unlock: |
d0b96690 | 4855 | rcu_read_unlock(); |
d5d629b5 DG |
4856 | if (ret) { |
4857 | free(fields); | |
4858 | } | |
d0b96690 DG |
4859 | return ret; |
4860 | } | |
4861 | ||
d88aee68 DG |
4862 | /* |
4863 | * Add event to the UST channel registry. When the event is added to the | |
4864 | * registry, the metadata is also created. Once done, this replies to the | |
4865 | * application with the appropriate error code. | |
4866 | * | |
4867 | * The session UST registry lock is acquired in the function. | |
4868 | * | |
4869 | * On success 0 is returned else a negative value. | |
4870 | */ | |
d0b96690 DG |
4871 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
4872 | char *sig, size_t nr_fields, struct ustctl_field *fields, int loglevel, | |
4873 | char *model_emf_uri) | |
4874 | { | |
4875 | int ret, ret_code; | |
4876 | uint32_t event_id = 0; | |
7972aab2 | 4877 | uint64_t chan_reg_key; |
d0b96690 DG |
4878 | struct ust_app *app; |
4879 | struct ust_app_channel *ua_chan; | |
4880 | struct ust_app_session *ua_sess; | |
7972aab2 | 4881 | struct ust_registry_session *registry; |
d0b96690 DG |
4882 | |
4883 | rcu_read_lock(); | |
4884 | ||
4885 | /* Lookup application. If not found, there is a code flow error. */ | |
4886 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4887 | if (!app) { |
4888 | DBG("Application socket %d is being teardown. Abort event notify", | |
4889 | sock); | |
4890 | ret = 0; | |
d5d629b5 DG |
4891 | free(sig); |
4892 | free(fields); | |
4893 | free(model_emf_uri); | |
d88aee68 DG |
4894 | goto error_rcu_unlock; |
4895 | } | |
d0b96690 | 4896 | |
4950b860 | 4897 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4898 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4899 | if (!ua_chan) { |
4900 | DBG("Application channel is being teardown. Abort event notify"); | |
4901 | ret = 0; | |
d5d629b5 DG |
4902 | free(sig); |
4903 | free(fields); | |
4904 | free(model_emf_uri); | |
4950b860 MD |
4905 | goto error_rcu_unlock; |
4906 | } | |
4907 | ||
d0b96690 DG |
4908 | assert(ua_chan->session); |
4909 | ua_sess = ua_chan->session; | |
4910 | ||
7972aab2 DG |
4911 | registry = get_session_registry(ua_sess); |
4912 | assert(registry); | |
4913 | ||
4914 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4915 | chan_reg_key = ua_chan->tracing_channel_id; | |
4916 | } else { | |
4917 | chan_reg_key = ua_chan->key; | |
4918 | } | |
4919 | ||
4920 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 4921 | |
d5d629b5 DG |
4922 | /* |
4923 | * From this point on, this call acquires the ownership of the sig, fields | |
4924 | * and model_emf_uri meaning any free are done inside it if needed. These | |
4925 | * three variables MUST NOT be read/write after this. | |
4926 | */ | |
7972aab2 | 4927 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
45893984 | 4928 | sobjd, cobjd, name, sig, nr_fields, fields, loglevel, |
8494bda5 MD |
4929 | model_emf_uri, ua_sess->buffer_type, &event_id, |
4930 | app); | |
d0b96690 DG |
4931 | |
4932 | /* | |
4933 | * The return value is returned to ustctl so in case of an error, the | |
4934 | * application can be notified. In case of an error, it's important not to | |
4935 | * return a negative error or else the application will get closed. | |
4936 | */ | |
4937 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
4938 | if (ret < 0) { | |
4939 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4940 | ERR("UST app reply event failed with ret %d", ret); | |
4941 | } else { | |
4942 | DBG3("UST app reply event failed. Application died"); | |
4943 | } | |
4944 | /* | |
4945 | * No need to wipe the create event since the application socket will | |
4946 | * get close on error hence cleaning up everything by itself. | |
4947 | */ | |
4948 | goto error; | |
4949 | } | |
4950 | ||
7972aab2 DG |
4951 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
4952 | name, event_id); | |
d88aee68 | 4953 | |
d0b96690 | 4954 | error: |
7972aab2 | 4955 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4956 | error_rcu_unlock: |
d0b96690 DG |
4957 | rcu_read_unlock(); |
4958 | return ret; | |
4959 | } | |
4960 | ||
d88aee68 DG |
4961 | /* |
4962 | * Handle application notification through the given notify socket. | |
4963 | * | |
4964 | * Return 0 on success or else a negative value. | |
4965 | */ | |
d0b96690 DG |
4966 | int ust_app_recv_notify(int sock) |
4967 | { | |
4968 | int ret; | |
4969 | enum ustctl_notify_cmd cmd; | |
4970 | ||
4971 | DBG3("UST app receiving notify from sock %d", sock); | |
4972 | ||
4973 | ret = ustctl_recv_notify(sock, &cmd); | |
4974 | if (ret < 0) { | |
4975 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4976 | ERR("UST app recv notify failed with ret %d", ret); | |
4977 | } else { | |
4978 | DBG3("UST app recv notify failed. Application died"); | |
4979 | } | |
4980 | goto error; | |
4981 | } | |
4982 | ||
4983 | switch (cmd) { | |
4984 | case USTCTL_NOTIFY_CMD_EVENT: | |
4985 | { | |
4986 | int sobjd, cobjd, loglevel; | |
4987 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; | |
4988 | size_t nr_fields; | |
4989 | struct ustctl_field *fields; | |
4990 | ||
4991 | DBG2("UST app ustctl register event received"); | |
4992 | ||
4993 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, &loglevel, | |
4994 | &sig, &nr_fields, &fields, &model_emf_uri); | |
4995 | if (ret < 0) { | |
4996 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4997 | ERR("UST app recv event failed with ret %d", ret); | |
4998 | } else { | |
4999 | DBG3("UST app recv event failed. Application died"); | |
5000 | } | |
5001 | goto error; | |
5002 | } | |
5003 | ||
d5d629b5 DG |
5004 | /* |
5005 | * Add event to the UST registry coming from the notify socket. This | |
5006 | * call will free if needed the sig, fields and model_emf_uri. This | |
5007 | * code path loses the ownsership of these variables and transfer them | |
5008 | * to the this function. | |
5009 | */ | |
d0b96690 DG |
5010 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
5011 | fields, loglevel, model_emf_uri); | |
5012 | if (ret < 0) { | |
5013 | goto error; | |
5014 | } | |
5015 | ||
5016 | break; | |
5017 | } | |
5018 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
5019 | { | |
5020 | int sobjd, cobjd; | |
5021 | size_t nr_fields; | |
5022 | struct ustctl_field *fields; | |
5023 | ||
5024 | DBG2("UST app ustctl register channel received"); | |
5025 | ||
5026 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
5027 | &fields); | |
5028 | if (ret < 0) { | |
5029 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5030 | ERR("UST app recv channel failed with ret %d", ret); | |
5031 | } else { | |
5032 | DBG3("UST app recv channel failed. Application died"); | |
5033 | } | |
5034 | goto error; | |
5035 | } | |
5036 | ||
d5d629b5 DG |
5037 | /* |
5038 | * The fields ownership are transfered to this function call meaning | |
5039 | * that if needed it will be freed. After this, it's invalid to access | |
5040 | * fields or clean it up. | |
5041 | */ | |
d0b96690 DG |
5042 | ret = reply_ust_register_channel(sock, sobjd, cobjd, nr_fields, |
5043 | fields); | |
5044 | if (ret < 0) { | |
5045 | goto error; | |
5046 | } | |
5047 | ||
5048 | break; | |
5049 | } | |
5050 | default: | |
5051 | /* Should NEVER happen. */ | |
5052 | assert(0); | |
5053 | } | |
5054 | ||
5055 | error: | |
5056 | return ret; | |
5057 | } | |
d88aee68 DG |
5058 | |
5059 | /* | |
5060 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
5061 | * corresponding application. On failure, the call_rcu to close the socket is | |
5062 | * executed. If an application is found, it tries to delete it from the notify | |
5063 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
5064 | * | |
5065 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
5066 | * call RCU is not done but the rest of the cleanup is. | |
5067 | */ | |
5068 | void ust_app_notify_sock_unregister(int sock) | |
5069 | { | |
5070 | int err_enomem = 0; | |
5071 | struct lttng_ht_iter iter; | |
5072 | struct ust_app *app; | |
5073 | struct ust_app_notify_sock_obj *obj; | |
5074 | ||
5075 | assert(sock >= 0); | |
5076 | ||
5077 | rcu_read_lock(); | |
5078 | ||
5079 | obj = zmalloc(sizeof(*obj)); | |
5080 | if (!obj) { | |
5081 | /* | |
5082 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
5083 | * procedure but the call_rcu will not be called. In this case, we | |
5084 | * accept the fd leak rather than possibly creating an unsynchronized | |
5085 | * state between threads. | |
5086 | * | |
5087 | * TODO: The notify object should be created once the notify socket is | |
5088 | * registered and stored independantely from the ust app object. The | |
5089 | * tricky part is to synchronize the teardown of the application and | |
5090 | * this notify object. Let's keep that in mind so we can avoid this | |
5091 | * kind of shenanigans with ENOMEM in the teardown path. | |
5092 | */ | |
5093 | err_enomem = 1; | |
5094 | } else { | |
5095 | obj->fd = sock; | |
5096 | } | |
5097 | ||
5098 | DBG("UST app notify socket unregister %d", sock); | |
5099 | ||
5100 | /* | |
5101 | * Lookup application by notify socket. If this fails, this means that the | |
5102 | * hash table delete has already been done by the application | |
5103 | * unregistration process so we can safely close the notify socket in a | |
5104 | * call RCU. | |
5105 | */ | |
5106 | app = find_app_by_notify_sock(sock); | |
5107 | if (!app) { | |
5108 | goto close_socket; | |
5109 | } | |
5110 | ||
5111 | iter.iter.node = &app->notify_sock_n.node; | |
5112 | ||
5113 | /* | |
5114 | * Whatever happens here either we fail or succeed, in both cases we have | |
5115 | * to close the socket after a grace period to continue to the call RCU | |
5116 | * here. If the deletion is successful, the application is not visible | |
5117 | * anymore by other threads and is it fails it means that it was already | |
5118 | * deleted from the hash table so either way we just have to close the | |
5119 | * socket. | |
5120 | */ | |
5121 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
5122 | ||
5123 | close_socket: | |
5124 | rcu_read_unlock(); | |
5125 | ||
5126 | /* | |
5127 | * Close socket after a grace period to avoid for the socket to be reused | |
5128 | * before the application object is freed creating potential race between | |
5129 | * threads trying to add unique in the global hash table. | |
5130 | */ | |
5131 | if (!err_enomem) { | |
5132 | call_rcu(&obj->head, close_notify_sock_rcu); | |
5133 | } | |
5134 | } | |
f45e313d DG |
5135 | |
5136 | /* | |
5137 | * Destroy a ust app data structure and free its memory. | |
5138 | */ | |
5139 | void ust_app_destroy(struct ust_app *app) | |
5140 | { | |
5141 | if (!app) { | |
5142 | return; | |
5143 | } | |
5144 | ||
5145 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
5146 | } | |
6dc3064a DG |
5147 | |
5148 | /* | |
5149 | * Take a snapshot for a given UST session. The snapshot is sent to the given | |
5150 | * output. | |
5151 | * | |
5152 | * Return 0 on success or else a negative value. | |
5153 | */ | |
5154 | int ust_app_snapshot_record(struct ltt_ust_session *usess, | |
d07ceecd MD |
5155 | struct snapshot_output *output, int wait, |
5156 | uint64_t nb_packets_per_stream) | |
6dc3064a DG |
5157 | { |
5158 | int ret = 0; | |
7badf927 | 5159 | unsigned int snapshot_done = 0; |
6dc3064a DG |
5160 | struct lttng_ht_iter iter; |
5161 | struct ust_app *app; | |
af706bb7 | 5162 | char pathname[PATH_MAX]; |
6dc3064a DG |
5163 | |
5164 | assert(usess); | |
5165 | assert(output); | |
5166 | ||
5167 | rcu_read_lock(); | |
5168 | ||
8c924c7b MD |
5169 | switch (usess->buffer_type) { |
5170 | case LTTNG_BUFFER_PER_UID: | |
5171 | { | |
5172 | struct buffer_reg_uid *reg; | |
6dc3064a | 5173 | |
8c924c7b MD |
5174 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
5175 | struct buffer_reg_channel *reg_chan; | |
5176 | struct consumer_socket *socket; | |
6dc3064a | 5177 | |
8c924c7b MD |
5178 | /* Get consumer socket to use to push the metadata.*/ |
5179 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
5180 | usess->consumer); | |
5181 | if (!socket) { | |
5182 | ret = -EINVAL; | |
5183 | goto error; | |
5184 | } | |
6dc3064a | 5185 | |
8c924c7b MD |
5186 | memset(pathname, 0, sizeof(pathname)); |
5187 | ret = snprintf(pathname, sizeof(pathname), | |
5188 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH, | |
5189 | reg->uid, reg->bits_per_long); | |
5190 | if (ret < 0) { | |
5191 | PERROR("snprintf snapshot path"); | |
5192 | goto error; | |
5193 | } | |
5194 | ||
5195 | /* Add the UST default trace dir to path. */ | |
5196 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
5197 | reg_chan, node.node) { | |
68808f4e DG |
5198 | ret = consumer_snapshot_channel(socket, reg_chan->consumer_key, |
5199 | output, 0, usess->uid, usess->gid, pathname, wait, | |
d07ceecd | 5200 | nb_packets_per_stream); |
8c924c7b MD |
5201 | if (ret < 0) { |
5202 | goto error; | |
5203 | } | |
5204 | } | |
68808f4e DG |
5205 | ret = consumer_snapshot_channel(socket, |
5206 | reg->registry->reg.ust->metadata_key, output, 1, | |
d07ceecd | 5207 | usess->uid, usess->gid, pathname, wait, 0); |
8c924c7b MD |
5208 | if (ret < 0) { |
5209 | goto error; | |
5210 | } | |
7badf927 | 5211 | snapshot_done = 1; |
af706bb7 | 5212 | } |
8c924c7b MD |
5213 | break; |
5214 | } | |
5215 | case LTTNG_BUFFER_PER_PID: | |
5216 | { | |
5217 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5218 | struct consumer_socket *socket; | |
5219 | struct lttng_ht_iter chan_iter; | |
5220 | struct ust_app_channel *ua_chan; | |
5221 | struct ust_app_session *ua_sess; | |
5222 | struct ust_registry_session *registry; | |
5223 | ||
5224 | ua_sess = lookup_session_by_app(usess, app); | |
5225 | if (!ua_sess) { | |
5226 | /* Session not associated with this app. */ | |
5227 | continue; | |
5228 | } | |
af706bb7 | 5229 | |
8c924c7b MD |
5230 | /* Get the right consumer socket for the application. */ |
5231 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
5232 | output->consumer); | |
5233 | if (!socket) { | |
5c786ded | 5234 | ret = -EINVAL; |
5c786ded JD |
5235 | goto error; |
5236 | } | |
5237 | ||
8c924c7b MD |
5238 | /* Add the UST default trace dir to path. */ |
5239 | memset(pathname, 0, sizeof(pathname)); | |
5240 | ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "/%s", | |
5241 | ua_sess->path); | |
6dc3064a | 5242 | if (ret < 0) { |
8c924c7b | 5243 | PERROR("snprintf snapshot path"); |
6dc3064a DG |
5244 | goto error; |
5245 | } | |
6dc3064a | 5246 | |
8c924c7b MD |
5247 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, |
5248 | ua_chan, node.node) { | |
68808f4e DG |
5249 | ret = consumer_snapshot_channel(socket, ua_chan->key, output, |
5250 | 0, ua_sess->euid, ua_sess->egid, pathname, wait, | |
d07ceecd | 5251 | nb_packets_per_stream); |
8c924c7b MD |
5252 | if (ret < 0) { |
5253 | goto error; | |
5254 | } | |
5255 | } | |
5256 | ||
5257 | registry = get_session_registry(ua_sess); | |
5258 | assert(registry); | |
5259 | ret = consumer_snapshot_channel(socket, registry->metadata_key, output, | |
d07ceecd | 5260 | 1, ua_sess->euid, ua_sess->egid, pathname, wait, 0); |
8c924c7b MD |
5261 | if (ret < 0) { |
5262 | goto error; | |
5263 | } | |
7badf927 | 5264 | snapshot_done = 1; |
8c924c7b MD |
5265 | } |
5266 | break; | |
5267 | } | |
5268 | default: | |
5269 | assert(0); | |
5270 | break; | |
6dc3064a DG |
5271 | } |
5272 | ||
7badf927 DG |
5273 | if (!snapshot_done) { |
5274 | /* | |
5275 | * If no snapshot was made and we are not in the error path, this means | |
5276 | * that there are no buffers thus no (prior) application to snapshot | |
5277 | * data from so we have simply NO data. | |
5278 | */ | |
5279 | ret = -ENODATA; | |
5280 | } | |
5281 | ||
6dc3064a DG |
5282 | error: |
5283 | rcu_read_unlock(); | |
5284 | return ret; | |
5285 | } | |
5c786ded JD |
5286 | |
5287 | /* | |
d07ceecd | 5288 | * Return the size taken by one more packet per stream. |
5c786ded | 5289 | */ |
d07ceecd MD |
5290 | uint64_t ust_app_get_size_one_more_packet_per_stream(struct ltt_ust_session *usess, |
5291 | uint64_t cur_nr_packets) | |
5c786ded | 5292 | { |
d07ceecd | 5293 | uint64_t tot_size = 0; |
5c786ded JD |
5294 | struct ust_app *app; |
5295 | struct lttng_ht_iter iter; | |
5296 | ||
5297 | assert(usess); | |
5298 | ||
5299 | switch (usess->buffer_type) { | |
5300 | case LTTNG_BUFFER_PER_UID: | |
5301 | { | |
5302 | struct buffer_reg_uid *reg; | |
5303 | ||
5304 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
5305 | struct buffer_reg_channel *reg_chan; | |
5306 | ||
b7064eaa | 5307 | rcu_read_lock(); |
5c786ded JD |
5308 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
5309 | reg_chan, node.node) { | |
d07ceecd MD |
5310 | if (cur_nr_packets >= reg_chan->num_subbuf) { |
5311 | /* | |
5312 | * Don't take channel into account if we | |
5313 | * already grab all its packets. | |
5314 | */ | |
5315 | continue; | |
5316 | } | |
5317 | tot_size += reg_chan->subbuf_size * reg_chan->stream_count; | |
5c786ded | 5318 | } |
b7064eaa | 5319 | rcu_read_unlock(); |
5c786ded JD |
5320 | } |
5321 | break; | |
5322 | } | |
5323 | case LTTNG_BUFFER_PER_PID: | |
5324 | { | |
5325 | rcu_read_lock(); | |
5326 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5327 | struct ust_app_channel *ua_chan; | |
5328 | struct ust_app_session *ua_sess; | |
5329 | struct lttng_ht_iter chan_iter; | |
5330 | ||
5331 | ua_sess = lookup_session_by_app(usess, app); | |
5332 | if (!ua_sess) { | |
5333 | /* Session not associated with this app. */ | |
5334 | continue; | |
5335 | } | |
5336 | ||
5337 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
5338 | ua_chan, node.node) { | |
d07ceecd MD |
5339 | if (cur_nr_packets >= ua_chan->attr.num_subbuf) { |
5340 | /* | |
5341 | * Don't take channel into account if we | |
5342 | * already grab all its packets. | |
5343 | */ | |
5344 | continue; | |
5345 | } | |
5346 | tot_size += ua_chan->attr.subbuf_size * ua_chan->streams.count; | |
5c786ded JD |
5347 | } |
5348 | } | |
5349 | rcu_read_unlock(); | |
5350 | break; | |
5351 | } | |
5352 | default: | |
5353 | assert(0); | |
5354 | break; | |
5355 | } | |
5356 | ||
d07ceecd | 5357 | return tot_size; |
5c786ded | 5358 | } |