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 | ||
b161602a MD |
680 | assert(!ua_sess->deleted); |
681 | ua_sess->deleted = true; | |
682 | ||
7972aab2 | 683 | registry = get_session_registry(ua_sess); |
ce34fcd0 | 684 | if (registry) { |
d88aee68 | 685 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 686 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 687 | |
7972aab2 DG |
688 | /* |
689 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
690 | * metadata only on destroy trace session in this case. Also, the |
691 | * previous push metadata could have flag the metadata registry to | |
692 | * close so don't send a close command if closed. | |
7972aab2 | 693 | */ |
ce34fcd0 | 694 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
695 | /* And ask to close it for this session registry. */ |
696 | (void) close_metadata(registry, ua_sess->consumer); | |
697 | } | |
d80a6244 DG |
698 | } |
699 | ||
bec39940 DG |
700 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
701 | node.node) { | |
702 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 703 | assert(!ret); |
d0b96690 | 704 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 705 | } |
d80a6244 | 706 | |
7972aab2 DG |
707 | /* In case of per PID, the registry is kept in the session. */ |
708 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
709 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
710 | if (reg_pid) { | |
711 | buffer_reg_pid_remove(reg_pid); | |
712 | buffer_reg_pid_destroy(reg_pid); | |
713 | } | |
714 | } | |
d0b96690 | 715 | |
aee6bafd | 716 | if (ua_sess->handle != -1) { |
ffe60014 DG |
717 | ret = ustctl_release_handle(sock, ua_sess->handle); |
718 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
719 | ERR("UST app sock %d release session handle failed with ret %d", | |
720 | sock, ret); | |
721 | } | |
aee6bafd | 722 | } |
1b532a60 DG |
723 | pthread_mutex_unlock(&ua_sess->lock); |
724 | ||
36b588ed | 725 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 726 | } |
91d76f53 DG |
727 | |
728 | /* | |
284d8f55 DG |
729 | * Delete a traceable application structure from the global list. Never call |
730 | * this function outside of a call_rcu call. | |
36b588ed MD |
731 | * |
732 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 733 | */ |
8b366481 DG |
734 | static |
735 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 736 | { |
8b366481 | 737 | int ret, sock; |
d42f20df | 738 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 739 | |
d80a6244 | 740 | /* Delete ust app sessions info */ |
852d0037 DG |
741 | sock = app->sock; |
742 | app->sock = -1; | |
d80a6244 | 743 | |
8b366481 | 744 | /* Wipe sessions */ |
d42f20df DG |
745 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
746 | teardown_node) { | |
747 | /* Free every object in the session and the session. */ | |
36b588ed | 748 | rcu_read_lock(); |
d0b96690 | 749 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 750 | rcu_read_unlock(); |
d80a6244 | 751 | } |
36b588ed | 752 | |
0b2dc8df MD |
753 | ht_cleanup_push(app->sessions); |
754 | ht_cleanup_push(app->ust_objd); | |
d80a6244 | 755 | |
6414a713 | 756 | /* |
852d0037 DG |
757 | * Wait until we have deleted the application from the sock hash table |
758 | * before closing this socket, otherwise an application could re-use the | |
759 | * socket ID and race with the teardown, using the same hash table entry. | |
760 | * | |
761 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
762 | * all RCU readers that could run concurrently with unregister app, | |
763 | * therefore we _need_ to only close that socket after a grace period. So | |
764 | * it should stay in this RCU callback. | |
765 | * | |
766 | * This close() is a very important step of the synchronization model so | |
767 | * every modification to this function must be carefully reviewed. | |
6414a713 | 768 | */ |
799e2c4f MD |
769 | ret = close(sock); |
770 | if (ret) { | |
771 | PERROR("close"); | |
772 | } | |
4063050c | 773 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 774 | |
852d0037 | 775 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 776 | free(app); |
099e26bd DG |
777 | } |
778 | ||
779 | /* | |
f6a9efaa | 780 | * URCU intermediate call to delete an UST app. |
099e26bd | 781 | */ |
8b366481 DG |
782 | static |
783 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 784 | { |
bec39940 DG |
785 | struct lttng_ht_node_ulong *node = |
786 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 787 | struct ust_app *app = |
852d0037 | 788 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 789 | |
852d0037 | 790 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 791 | delete_ust_app(app); |
099e26bd DG |
792 | } |
793 | ||
ffe60014 DG |
794 | /* |
795 | * Delete the session from the application ht and delete the data structure by | |
796 | * freeing every object inside and releasing them. | |
797 | */ | |
d0b96690 | 798 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
799 | struct ust_app_session *ua_sess) |
800 | { | |
801 | int ret; | |
802 | struct lttng_ht_iter iter; | |
803 | ||
804 | assert(app); | |
805 | assert(ua_sess); | |
806 | ||
807 | iter.iter.node = &ua_sess->node.node; | |
808 | ret = lttng_ht_del(app->sessions, &iter); | |
809 | if (ret) { | |
810 | /* Already scheduled for teardown. */ | |
811 | goto end; | |
812 | } | |
813 | ||
814 | /* Once deleted, free the data structure. */ | |
d0b96690 | 815 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
816 | |
817 | end: | |
818 | return; | |
819 | } | |
820 | ||
8b366481 DG |
821 | /* |
822 | * Alloc new UST app session. | |
823 | */ | |
824 | static | |
d0b96690 | 825 | struct ust_app_session *alloc_ust_app_session(struct ust_app *app) |
8b366481 DG |
826 | { |
827 | struct ust_app_session *ua_sess; | |
828 | ||
829 | /* Init most of the default value by allocating and zeroing */ | |
830 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
831 | if (ua_sess == NULL) { | |
832 | PERROR("malloc"); | |
ffe60014 | 833 | goto error_free; |
8b366481 DG |
834 | } |
835 | ||
836 | ua_sess->handle = -1; | |
bec39940 | 837 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
ad7a9107 | 838 | ua_sess->metadata_attr.type = LTTNG_UST_CHAN_METADATA; |
84ad93e8 | 839 | pthread_mutex_init(&ua_sess->lock, NULL); |
ad7a9107 | 840 | |
8b366481 DG |
841 | return ua_sess; |
842 | ||
ffe60014 | 843 | error_free: |
8b366481 DG |
844 | return NULL; |
845 | } | |
846 | ||
847 | /* | |
848 | * Alloc new UST app channel. | |
849 | */ | |
850 | static | |
851 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 852 | struct ust_app_session *ua_sess, |
ffe60014 | 853 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
854 | { |
855 | struct ust_app_channel *ua_chan; | |
856 | ||
857 | /* Init most of the default value by allocating and zeroing */ | |
858 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
859 | if (ua_chan == NULL) { | |
860 | PERROR("malloc"); | |
861 | goto error; | |
862 | } | |
863 | ||
864 | /* Setup channel name */ | |
865 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
866 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
867 | ||
868 | ua_chan->enabled = 1; | |
869 | ua_chan->handle = -1; | |
45893984 | 870 | ua_chan->session = ua_sess; |
ffe60014 | 871 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
872 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
873 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
874 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
875 | |
876 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
31746f93 | 877 | CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); |
8b366481 DG |
878 | |
879 | /* Copy attributes */ | |
880 | if (attr) { | |
ffe60014 | 881 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
882 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
883 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
884 | ua_chan->attr.overwrite = attr->overwrite; | |
885 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
886 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
887 | ua_chan->attr.output = attr->output; | |
8b366481 | 888 | } |
ffe60014 DG |
889 | /* By default, the channel is a per cpu channel. */ |
890 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
891 | |
892 | DBG3("UST app channel %s allocated", ua_chan->name); | |
893 | ||
894 | return ua_chan; | |
895 | ||
896 | error: | |
897 | return NULL; | |
898 | } | |
899 | ||
37f1c236 DG |
900 | /* |
901 | * Allocate and initialize a UST app stream. | |
902 | * | |
903 | * Return newly allocated stream pointer or NULL on error. | |
904 | */ | |
ffe60014 | 905 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
906 | { |
907 | struct ust_app_stream *stream = NULL; | |
908 | ||
909 | stream = zmalloc(sizeof(*stream)); | |
910 | if (stream == NULL) { | |
911 | PERROR("zmalloc ust app stream"); | |
912 | goto error; | |
913 | } | |
914 | ||
915 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
916 | stream->handle = -1; | |
917 | ||
918 | error: | |
919 | return stream; | |
920 | } | |
921 | ||
8b366481 DG |
922 | /* |
923 | * Alloc new UST app event. | |
924 | */ | |
925 | static | |
926 | struct ust_app_event *alloc_ust_app_event(char *name, | |
927 | struct lttng_ust_event *attr) | |
928 | { | |
929 | struct ust_app_event *ua_event; | |
930 | ||
931 | /* Init most of the default value by allocating and zeroing */ | |
932 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
933 | if (ua_event == NULL) { | |
934 | PERROR("malloc"); | |
935 | goto error; | |
936 | } | |
937 | ||
938 | ua_event->enabled = 1; | |
939 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
940 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 941 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
942 | |
943 | /* Copy attributes */ | |
944 | if (attr) { | |
945 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
946 | } | |
947 | ||
948 | DBG3("UST app event %s allocated", ua_event->name); | |
949 | ||
950 | return ua_event; | |
951 | ||
952 | error: | |
953 | return NULL; | |
954 | } | |
955 | ||
956 | /* | |
957 | * Alloc new UST app context. | |
958 | */ | |
959 | static | |
960 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx) | |
961 | { | |
962 | struct ust_app_ctx *ua_ctx; | |
963 | ||
964 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
965 | if (ua_ctx == NULL) { | |
966 | goto error; | |
967 | } | |
968 | ||
31746f93 DG |
969 | CDS_INIT_LIST_HEAD(&ua_ctx->list); |
970 | ||
8b366481 DG |
971 | if (uctx) { |
972 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
973 | } | |
974 | ||
975 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
976 | ||
977 | error: | |
978 | return ua_ctx; | |
979 | } | |
980 | ||
025faf73 DG |
981 | /* |
982 | * Allocate a filter and copy the given original filter. | |
983 | * | |
984 | * Return allocated filter or NULL on error. | |
985 | */ | |
51755dc8 JG |
986 | static struct lttng_filter_bytecode *copy_filter_bytecode( |
987 | struct lttng_filter_bytecode *orig_f) | |
025faf73 | 988 | { |
51755dc8 | 989 | struct lttng_filter_bytecode *filter = NULL; |
025faf73 DG |
990 | |
991 | /* Copy filter bytecode */ | |
992 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
993 | if (!filter) { | |
51755dc8 | 994 | PERROR("zmalloc alloc filter bytecode"); |
025faf73 DG |
995 | goto error; |
996 | } | |
997 | ||
998 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
999 | ||
1000 | error: | |
1001 | return filter; | |
1002 | } | |
1003 | ||
51755dc8 JG |
1004 | /* |
1005 | * Create a liblttng-ust filter bytecode from given bytecode. | |
1006 | * | |
1007 | * Return allocated filter or NULL on error. | |
1008 | */ | |
1009 | static struct lttng_ust_filter_bytecode *create_ust_bytecode_from_bytecode( | |
1010 | struct lttng_filter_bytecode *orig_f) | |
1011 | { | |
1012 | struct lttng_ust_filter_bytecode *filter = NULL; | |
1013 | ||
1014 | /* Copy filter bytecode */ | |
1015 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
1016 | if (!filter) { | |
1017 | PERROR("zmalloc alloc ust filter bytecode"); | |
1018 | goto error; | |
1019 | } | |
1020 | ||
1021 | assert(sizeof(struct lttng_filter_bytecode) == | |
1022 | sizeof(struct lttng_ust_filter_bytecode)); | |
1023 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
1024 | error: | |
1025 | return filter; | |
1026 | } | |
1027 | ||
099e26bd | 1028 | /* |
421cb601 DG |
1029 | * Find an ust_app using the sock and return it. RCU read side lock must be |
1030 | * held before calling this helper function. | |
099e26bd | 1031 | */ |
f20baf8e | 1032 | struct ust_app *ust_app_find_by_sock(int sock) |
099e26bd | 1033 | { |
bec39940 | 1034 | struct lttng_ht_node_ulong *node; |
bec39940 | 1035 | struct lttng_ht_iter iter; |
f6a9efaa | 1036 | |
852d0037 | 1037 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 1038 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
1039 | if (node == NULL) { |
1040 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
1041 | goto error; |
1042 | } | |
852d0037 DG |
1043 | |
1044 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
1045 | |
1046 | error: | |
1047 | return NULL; | |
099e26bd DG |
1048 | } |
1049 | ||
d0b96690 DG |
1050 | /* |
1051 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
1052 | * be held before calling this helper function. | |
1053 | */ | |
1054 | static struct ust_app *find_app_by_notify_sock(int sock) | |
1055 | { | |
1056 | struct lttng_ht_node_ulong *node; | |
1057 | struct lttng_ht_iter iter; | |
1058 | ||
1059 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
1060 | &iter); | |
1061 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1062 | if (node == NULL) { | |
1063 | DBG2("UST app find by notify sock %d not found", sock); | |
1064 | goto error; | |
1065 | } | |
1066 | ||
1067 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
1068 | ||
1069 | error: | |
1070 | return NULL; | |
1071 | } | |
1072 | ||
025faf73 DG |
1073 | /* |
1074 | * Lookup for an ust app event based on event name, filter bytecode and the | |
1075 | * event loglevel. | |
1076 | * | |
1077 | * Return an ust_app_event object or NULL on error. | |
1078 | */ | |
18eace3b | 1079 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
51755dc8 | 1080 | char *name, struct lttng_filter_bytecode *filter, int loglevel, |
39c5a3a7 | 1081 | const struct lttng_event_exclusion *exclusion) |
18eace3b DG |
1082 | { |
1083 | struct lttng_ht_iter iter; | |
1084 | struct lttng_ht_node_str *node; | |
1085 | struct ust_app_event *event = NULL; | |
1086 | struct ust_app_ht_key key; | |
18eace3b DG |
1087 | |
1088 | assert(name); | |
1089 | assert(ht); | |
1090 | ||
1091 | /* Setup key for event lookup. */ | |
1092 | key.name = name; | |
1093 | key.filter = filter; | |
1094 | key.loglevel = loglevel; | |
39c5a3a7 | 1095 | /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */ |
51755dc8 | 1096 | key.exclusion = exclusion; |
18eace3b | 1097 | |
025faf73 DG |
1098 | /* Lookup using the event name as hash and a custom match fct. */ |
1099 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1100 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1101 | node = lttng_ht_iter_get_node_str(&iter); |
1102 | if (node == NULL) { | |
1103 | goto end; | |
1104 | } | |
1105 | ||
1106 | event = caa_container_of(node, struct ust_app_event, node); | |
1107 | ||
1108 | end: | |
18eace3b DG |
1109 | return event; |
1110 | } | |
1111 | ||
55cc08a6 DG |
1112 | /* |
1113 | * Create the channel context on the tracer. | |
d0b96690 DG |
1114 | * |
1115 | * Called with UST app session lock held. | |
55cc08a6 DG |
1116 | */ |
1117 | static | |
1118 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1119 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1120 | { | |
1121 | int ret; | |
1122 | ||
840cb59c | 1123 | health_code_update(); |
86acf0da | 1124 | |
852d0037 | 1125 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 DG |
1126 | ua_chan->obj, &ua_ctx->obj); |
1127 | if (ret < 0) { | |
ffe60014 DG |
1128 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1129 | ERR("UST app create channel context failed for app (pid: %d) " | |
1130 | "with ret %d", app->pid, ret); | |
1131 | } else { | |
3757b385 DG |
1132 | /* |
1133 | * This is normal behavior, an application can die during the | |
1134 | * creation process. Don't report an error so the execution can | |
1135 | * continue normally. | |
1136 | */ | |
1137 | ret = 0; | |
ffe60014 DG |
1138 | DBG3("UST app disable event failed. Application is dead."); |
1139 | } | |
55cc08a6 DG |
1140 | goto error; |
1141 | } | |
1142 | ||
1143 | ua_ctx->handle = ua_ctx->obj->handle; | |
1144 | ||
d0b96690 DG |
1145 | DBG2("UST app context handle %d created successfully for channel %s", |
1146 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1147 | |
1148 | error: | |
840cb59c | 1149 | health_code_update(); |
55cc08a6 DG |
1150 | return ret; |
1151 | } | |
1152 | ||
53a80697 MD |
1153 | /* |
1154 | * Set the filter on the tracer. | |
1155 | */ | |
1156 | static | |
1157 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
1158 | struct ust_app *app) | |
1159 | { | |
1160 | int ret; | |
51755dc8 | 1161 | struct lttng_ust_filter_bytecode *ust_bytecode = NULL; |
53a80697 | 1162 | |
840cb59c | 1163 | health_code_update(); |
86acf0da | 1164 | |
53a80697 | 1165 | if (!ua_event->filter) { |
86acf0da DG |
1166 | ret = 0; |
1167 | goto error; | |
53a80697 MD |
1168 | } |
1169 | ||
51755dc8 JG |
1170 | ust_bytecode = create_ust_bytecode_from_bytecode(ua_event->filter); |
1171 | if (!ust_bytecode) { | |
1172 | ret = -LTTNG_ERR_NOMEM; | |
1173 | goto error; | |
1174 | } | |
1175 | ret = ustctl_set_filter(app->sock, ust_bytecode, | |
53a80697 MD |
1176 | ua_event->obj); |
1177 | if (ret < 0) { | |
ffe60014 DG |
1178 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1179 | ERR("UST app event %s filter failed for app (pid: %d) " | |
1180 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1181 | } else { | |
3757b385 DG |
1182 | /* |
1183 | * This is normal behavior, an application can die during the | |
1184 | * creation process. Don't report an error so the execution can | |
1185 | * continue normally. | |
1186 | */ | |
1187 | ret = 0; | |
ffe60014 DG |
1188 | DBG3("UST app filter event failed. Application is dead."); |
1189 | } | |
53a80697 MD |
1190 | goto error; |
1191 | } | |
1192 | ||
1193 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
1194 | ||
1195 | error: | |
840cb59c | 1196 | health_code_update(); |
51755dc8 | 1197 | free(ust_bytecode); |
53a80697 MD |
1198 | return ret; |
1199 | } | |
1200 | ||
51755dc8 JG |
1201 | static |
1202 | struct lttng_ust_event_exclusion *create_ust_exclusion_from_exclusion( | |
1203 | struct lttng_event_exclusion *exclusion) | |
1204 | { | |
1205 | struct lttng_ust_event_exclusion *ust_exclusion = NULL; | |
1206 | size_t exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) + | |
1207 | LTTNG_UST_SYM_NAME_LEN * exclusion->count; | |
1208 | ||
1209 | ust_exclusion = zmalloc(exclusion_alloc_size); | |
1210 | if (!ust_exclusion) { | |
1211 | PERROR("malloc"); | |
1212 | goto end; | |
1213 | } | |
1214 | ||
1215 | assert(sizeof(struct lttng_event_exclusion) == | |
1216 | sizeof(struct lttng_ust_event_exclusion)); | |
1217 | memcpy(ust_exclusion, exclusion, exclusion_alloc_size); | |
1218 | end: | |
1219 | return ust_exclusion; | |
1220 | } | |
1221 | ||
7cc9a73c JI |
1222 | /* |
1223 | * Set event exclusions on the tracer. | |
1224 | */ | |
1225 | static | |
1226 | int set_ust_event_exclusion(struct ust_app_event *ua_event, | |
1227 | struct ust_app *app) | |
1228 | { | |
1229 | int ret; | |
51755dc8 | 1230 | struct lttng_ust_event_exclusion *ust_exclusion = NULL; |
7cc9a73c JI |
1231 | |
1232 | health_code_update(); | |
1233 | ||
1234 | if (!ua_event->exclusion || !ua_event->exclusion->count) { | |
1235 | ret = 0; | |
1236 | goto error; | |
1237 | } | |
1238 | ||
51755dc8 JG |
1239 | ust_exclusion = create_ust_exclusion_from_exclusion( |
1240 | ua_event->exclusion); | |
1241 | if (!ust_exclusion) { | |
1242 | ret = -LTTNG_ERR_NOMEM; | |
1243 | goto error; | |
1244 | } | |
1245 | ret = ustctl_set_exclusion(app->sock, ust_exclusion, ua_event->obj); | |
7cc9a73c JI |
1246 | if (ret < 0) { |
1247 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1248 | ERR("UST app event %s exclusions failed for app (pid: %d) " | |
1249 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1250 | } else { | |
1251 | /* | |
1252 | * This is normal behavior, an application can die during the | |
1253 | * creation process. Don't report an error so the execution can | |
1254 | * continue normally. | |
1255 | */ | |
1256 | ret = 0; | |
1257 | DBG3("UST app event exclusion failed. Application is dead."); | |
1258 | } | |
1259 | goto error; | |
1260 | } | |
1261 | ||
1262 | DBG2("UST exclusion set successfully for event %s", ua_event->name); | |
1263 | ||
1264 | error: | |
1265 | health_code_update(); | |
51755dc8 | 1266 | free(ust_exclusion); |
7cc9a73c JI |
1267 | return ret; |
1268 | } | |
1269 | ||
9730260e DG |
1270 | /* |
1271 | * Disable the specified event on to UST tracer for the UST session. | |
1272 | */ | |
1273 | static int disable_ust_event(struct ust_app *app, | |
1274 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1275 | { | |
1276 | int ret; | |
1277 | ||
840cb59c | 1278 | health_code_update(); |
86acf0da | 1279 | |
852d0037 | 1280 | ret = ustctl_disable(app->sock, ua_event->obj); |
9730260e | 1281 | if (ret < 0) { |
ffe60014 DG |
1282 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1283 | ERR("UST app event %s disable failed for app (pid: %d) " | |
1284 | "and session handle %d with ret %d", | |
1285 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1286 | } else { | |
3757b385 DG |
1287 | /* |
1288 | * This is normal behavior, an application can die during the | |
1289 | * creation process. Don't report an error so the execution can | |
1290 | * continue normally. | |
1291 | */ | |
1292 | ret = 0; | |
ffe60014 DG |
1293 | DBG3("UST app disable event failed. Application is dead."); |
1294 | } | |
9730260e DG |
1295 | goto error; |
1296 | } | |
1297 | ||
1298 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 1299 | ua_event->attr.name, app->pid); |
9730260e DG |
1300 | |
1301 | error: | |
840cb59c | 1302 | health_code_update(); |
9730260e DG |
1303 | return ret; |
1304 | } | |
1305 | ||
78f0bacd DG |
1306 | /* |
1307 | * Disable the specified channel on to UST tracer for the UST session. | |
1308 | */ | |
1309 | static int disable_ust_channel(struct ust_app *app, | |
1310 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1311 | { | |
1312 | int ret; | |
1313 | ||
840cb59c | 1314 | health_code_update(); |
86acf0da | 1315 | |
852d0037 | 1316 | ret = ustctl_disable(app->sock, ua_chan->obj); |
78f0bacd | 1317 | if (ret < 0) { |
ffe60014 DG |
1318 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1319 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1320 | "and session handle %d with ret %d", | |
1321 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1322 | } else { | |
3757b385 DG |
1323 | /* |
1324 | * This is normal behavior, an application can die during the | |
1325 | * creation process. Don't report an error so the execution can | |
1326 | * continue normally. | |
1327 | */ | |
1328 | ret = 0; | |
ffe60014 DG |
1329 | DBG3("UST app disable channel failed. Application is dead."); |
1330 | } | |
78f0bacd DG |
1331 | goto error; |
1332 | } | |
1333 | ||
78f0bacd | 1334 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1335 | ua_chan->name, app->pid); |
78f0bacd DG |
1336 | |
1337 | error: | |
840cb59c | 1338 | health_code_update(); |
78f0bacd DG |
1339 | return ret; |
1340 | } | |
1341 | ||
1342 | /* | |
1343 | * Enable the specified channel on to UST tracer for the UST session. | |
1344 | */ | |
1345 | static int enable_ust_channel(struct ust_app *app, | |
1346 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1347 | { | |
1348 | int ret; | |
1349 | ||
840cb59c | 1350 | health_code_update(); |
86acf0da | 1351 | |
852d0037 | 1352 | ret = ustctl_enable(app->sock, ua_chan->obj); |
78f0bacd | 1353 | if (ret < 0) { |
ffe60014 DG |
1354 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1355 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1356 | "and session handle %d with ret %d", | |
1357 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1358 | } else { | |
3757b385 DG |
1359 | /* |
1360 | * This is normal behavior, an application can die during the | |
1361 | * creation process. Don't report an error so the execution can | |
1362 | * continue normally. | |
1363 | */ | |
1364 | ret = 0; | |
ffe60014 DG |
1365 | DBG3("UST app enable channel failed. Application is dead."); |
1366 | } | |
78f0bacd DG |
1367 | goto error; |
1368 | } | |
1369 | ||
1370 | ua_chan->enabled = 1; | |
1371 | ||
1372 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1373 | ua_chan->name, app->pid); |
78f0bacd DG |
1374 | |
1375 | error: | |
840cb59c | 1376 | health_code_update(); |
78f0bacd DG |
1377 | return ret; |
1378 | } | |
1379 | ||
edb67388 DG |
1380 | /* |
1381 | * Enable the specified event on to UST tracer for the UST session. | |
1382 | */ | |
1383 | static int enable_ust_event(struct ust_app *app, | |
1384 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1385 | { | |
1386 | int ret; | |
1387 | ||
840cb59c | 1388 | health_code_update(); |
86acf0da | 1389 | |
852d0037 | 1390 | ret = ustctl_enable(app->sock, ua_event->obj); |
edb67388 | 1391 | if (ret < 0) { |
ffe60014 DG |
1392 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1393 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1394 | "and session handle %d with ret %d", | |
1395 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1396 | } else { | |
3757b385 DG |
1397 | /* |
1398 | * This is normal behavior, an application can die during the | |
1399 | * creation process. Don't report an error so the execution can | |
1400 | * continue normally. | |
1401 | */ | |
1402 | ret = 0; | |
ffe60014 DG |
1403 | DBG3("UST app enable event failed. Application is dead."); |
1404 | } | |
edb67388 DG |
1405 | goto error; |
1406 | } | |
1407 | ||
1408 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1409 | ua_event->attr.name, app->pid); |
edb67388 DG |
1410 | |
1411 | error: | |
840cb59c | 1412 | health_code_update(); |
edb67388 DG |
1413 | return ret; |
1414 | } | |
1415 | ||
099e26bd | 1416 | /* |
7972aab2 | 1417 | * Send channel and stream buffer to application. |
4f3ab6ee | 1418 | * |
ffe60014 | 1419 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1420 | */ |
7972aab2 DG |
1421 | static int send_channel_pid_to_ust(struct ust_app *app, |
1422 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1423 | { |
1424 | int ret; | |
ffe60014 | 1425 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1426 | |
1427 | assert(app); | |
ffe60014 | 1428 | assert(ua_sess); |
4f3ab6ee | 1429 | assert(ua_chan); |
4f3ab6ee | 1430 | |
840cb59c | 1431 | health_code_update(); |
4f3ab6ee | 1432 | |
7972aab2 DG |
1433 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1434 | app->sock); | |
86acf0da | 1435 | |
ffe60014 DG |
1436 | /* Send channel to the application. */ |
1437 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
1438 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1439 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1440 | goto error; | |
1441 | } else if (ret < 0) { | |
b551a063 DG |
1442 | goto error; |
1443 | } | |
1444 | ||
d88aee68 DG |
1445 | health_code_update(); |
1446 | ||
ffe60014 DG |
1447 | /* Send all streams to application. */ |
1448 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1449 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
a7169585 MD |
1450 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1451 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1452 | goto error; | |
1453 | } else if (ret < 0) { | |
ffe60014 DG |
1454 | goto error; |
1455 | } | |
1456 | /* We don't need the stream anymore once sent to the tracer. */ | |
1457 | cds_list_del(&stream->list); | |
1458 | delete_ust_app_stream(-1, stream); | |
1459 | } | |
ffe60014 DG |
1460 | /* Flag the channel that it is sent to the application. */ |
1461 | ua_chan->is_sent = 1; | |
ffe60014 | 1462 | |
b551a063 | 1463 | error: |
840cb59c | 1464 | health_code_update(); |
b551a063 DG |
1465 | return ret; |
1466 | } | |
1467 | ||
91d76f53 | 1468 | /* |
5b4a0ec0 | 1469 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1470 | * |
1471 | * Should be called with session mutex held. | |
91d76f53 | 1472 | */ |
edb67388 DG |
1473 | static |
1474 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1475 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1476 | { |
5b4a0ec0 | 1477 | int ret = 0; |
284d8f55 | 1478 | |
840cb59c | 1479 | health_code_update(); |
86acf0da | 1480 | |
5b4a0ec0 | 1481 | /* Create UST event on tracer */ |
852d0037 | 1482 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 DG |
1483 | &ua_event->obj); |
1484 | if (ret < 0) { | |
ffe60014 DG |
1485 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1486 | ERR("Error ustctl create event %s for app pid: %d with ret %d", | |
1487 | ua_event->attr.name, app->pid, ret); | |
1488 | } else { | |
3757b385 DG |
1489 | /* |
1490 | * This is normal behavior, an application can die during the | |
1491 | * creation process. Don't report an error so the execution can | |
1492 | * continue normally. | |
1493 | */ | |
1494 | ret = 0; | |
ffe60014 DG |
1495 | DBG3("UST app create event failed. Application is dead."); |
1496 | } | |
5b4a0ec0 | 1497 | goto error; |
91d76f53 | 1498 | } |
f6a9efaa | 1499 | |
5b4a0ec0 | 1500 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1501 | |
5b4a0ec0 | 1502 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1503 | ua_event->attr.name, app->pid); |
f6a9efaa | 1504 | |
840cb59c | 1505 | health_code_update(); |
86acf0da | 1506 | |
025faf73 DG |
1507 | /* Set filter if one is present. */ |
1508 | if (ua_event->filter) { | |
1509 | ret = set_ust_event_filter(ua_event, app); | |
1510 | if (ret < 0) { | |
1511 | goto error; | |
1512 | } | |
1513 | } | |
1514 | ||
7cc9a73c JI |
1515 | /* Set exclusions for the event */ |
1516 | if (ua_event->exclusion) { | |
1517 | ret = set_ust_event_exclusion(ua_event, app); | |
1518 | if (ret < 0) { | |
1519 | goto error; | |
1520 | } | |
1521 | } | |
1522 | ||
8535a6d9 | 1523 | /* If event not enabled, disable it on the tracer */ |
40113787 MD |
1524 | if (ua_event->enabled) { |
1525 | /* | |
1526 | * We now need to explicitly enable the event, since it | |
1527 | * is now disabled at creation. | |
1528 | */ | |
1529 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1530 | if (ret < 0) { | |
1531 | /* | |
1532 | * If we hit an EPERM, something is wrong with our enable call. If | |
1533 | * we get an EEXIST, there is a problem on the tracer side since we | |
1534 | * just created it. | |
1535 | */ | |
1536 | switch (ret) { | |
1537 | case -LTTNG_UST_ERR_PERM: | |
1538 | /* Code flow problem */ | |
1539 | assert(0); | |
1540 | case -LTTNG_UST_ERR_EXIST: | |
1541 | /* It's OK for our use case. */ | |
1542 | ret = 0; | |
1543 | break; | |
1544 | default: | |
1545 | break; | |
1546 | } | |
1547 | goto error; | |
1548 | } | |
8535a6d9 DG |
1549 | } |
1550 | ||
5b4a0ec0 | 1551 | error: |
840cb59c | 1552 | health_code_update(); |
5b4a0ec0 | 1553 | return ret; |
91d76f53 | 1554 | } |
48842b30 | 1555 | |
5b4a0ec0 DG |
1556 | /* |
1557 | * Copy data between an UST app event and a LTT event. | |
1558 | */ | |
421cb601 | 1559 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1560 | struct ltt_ust_event *uevent) |
1561 | { | |
b4ffad32 JI |
1562 | size_t exclusion_alloc_size; |
1563 | ||
48842b30 DG |
1564 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); |
1565 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1566 | ||
fc34caaa DG |
1567 | ua_event->enabled = uevent->enabled; |
1568 | ||
5b4a0ec0 DG |
1569 | /* Copy event attributes */ |
1570 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1571 | ||
53a80697 MD |
1572 | /* Copy filter bytecode */ |
1573 | if (uevent->filter) { | |
51755dc8 | 1574 | ua_event->filter = copy_filter_bytecode(uevent->filter); |
025faf73 | 1575 | /* Filter might be NULL here in case of ENONEM. */ |
53a80697 | 1576 | } |
b4ffad32 JI |
1577 | |
1578 | /* Copy exclusion data */ | |
1579 | if (uevent->exclusion) { | |
51755dc8 | 1580 | exclusion_alloc_size = sizeof(struct lttng_event_exclusion) + |
b4ffad32 JI |
1581 | LTTNG_UST_SYM_NAME_LEN * uevent->exclusion->count; |
1582 | ua_event->exclusion = zmalloc(exclusion_alloc_size); | |
5f8df26c JI |
1583 | if (ua_event->exclusion == NULL) { |
1584 | PERROR("malloc"); | |
1585 | } else { | |
1586 | memcpy(ua_event->exclusion, uevent->exclusion, | |
1587 | exclusion_alloc_size); | |
b4ffad32 JI |
1588 | } |
1589 | } | |
48842b30 DG |
1590 | } |
1591 | ||
5b4a0ec0 DG |
1592 | /* |
1593 | * Copy data between an UST app channel and a LTT channel. | |
1594 | */ | |
421cb601 | 1595 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1596 | struct ltt_ust_channel *uchan) |
1597 | { | |
bec39940 | 1598 | struct lttng_ht_iter iter; |
48842b30 | 1599 | struct ltt_ust_event *uevent; |
55cc08a6 | 1600 | struct ltt_ust_context *uctx; |
48842b30 | 1601 | struct ust_app_event *ua_event; |
55cc08a6 | 1602 | struct ust_app_ctx *ua_ctx; |
48842b30 | 1603 | |
fc34caaa | 1604 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1605 | |
1606 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1607 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 1608 | |
1624d5b7 JD |
1609 | ua_chan->tracefile_size = uchan->tracefile_size; |
1610 | ua_chan->tracefile_count = uchan->tracefile_count; | |
1611 | ||
ffe60014 DG |
1612 | /* Copy event attributes since the layout is different. */ |
1613 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1614 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1615 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1616 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1617 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
1618 | ua_chan->attr.output = uchan->attr.output; | |
1619 | /* | |
1620 | * Note that the attribute channel type is not set since the channel on the | |
1621 | * tracing registry side does not have this information. | |
1622 | */ | |
48842b30 | 1623 | |
fc34caaa | 1624 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1625 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1626 | |
31746f93 | 1627 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { |
55cc08a6 DG |
1628 | ua_ctx = alloc_ust_app_ctx(&uctx->ctx); |
1629 | if (ua_ctx == NULL) { | |
1630 | continue; | |
1631 | } | |
bec39940 DG |
1632 | lttng_ht_node_init_ulong(&ua_ctx->node, |
1633 | (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 1634 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 1635 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
55cc08a6 | 1636 | } |
48842b30 | 1637 | |
421cb601 | 1638 | /* Copy all events from ltt ust channel to ust app channel */ |
bec39940 | 1639 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
18eace3b | 1640 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 1641 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 1642 | if (ua_event == NULL) { |
421cb601 | 1643 | DBG2("UST event %s not found on shadow copy channel", |
48842b30 | 1644 | uevent->attr.name); |
284d8f55 | 1645 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
48842b30 | 1646 | if (ua_event == NULL) { |
5b4a0ec0 | 1647 | continue; |
48842b30 | 1648 | } |
421cb601 | 1649 | shadow_copy_event(ua_event, uevent); |
d0b96690 | 1650 | add_unique_ust_app_event(ua_chan, ua_event); |
48842b30 | 1651 | } |
48842b30 DG |
1652 | } |
1653 | ||
fc34caaa | 1654 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1655 | } |
1656 | ||
5b4a0ec0 DG |
1657 | /* |
1658 | * Copy data between a UST app session and a regular LTT session. | |
1659 | */ | |
421cb601 | 1660 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1661 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1662 | { |
bec39940 DG |
1663 | struct lttng_ht_node_str *ua_chan_node; |
1664 | struct lttng_ht_iter iter; | |
48842b30 DG |
1665 | struct ltt_ust_channel *uchan; |
1666 | struct ust_app_channel *ua_chan; | |
477d7741 MD |
1667 | time_t rawtime; |
1668 | struct tm *timeinfo; | |
1669 | char datetime[16]; | |
1670 | int ret; | |
d7ba1388 | 1671 | char tmp_shm_path[PATH_MAX]; |
477d7741 MD |
1672 | |
1673 | /* Get date and time for unique app path */ | |
1674 | time(&rawtime); | |
1675 | timeinfo = localtime(&rawtime); | |
1676 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1677 | |
421cb601 | 1678 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1679 | |
7972aab2 DG |
1680 | ua_sess->tracing_id = usess->id; |
1681 | ua_sess->id = get_next_session_id(); | |
1682 | ua_sess->uid = app->uid; | |
1683 | ua_sess->gid = app->gid; | |
1684 | ua_sess->euid = usess->uid; | |
1685 | ua_sess->egid = usess->gid; | |
1686 | ua_sess->buffer_type = usess->buffer_type; | |
1687 | ua_sess->bits_per_long = app->bits_per_long; | |
1688 | /* There is only one consumer object per session possible. */ | |
1689 | ua_sess->consumer = usess->consumer; | |
2bba9e53 | 1690 | ua_sess->output_traces = usess->output_traces; |
ecc48a90 | 1691 | ua_sess->live_timer_interval = usess->live_timer_interval; |
84ad93e8 DG |
1692 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, |
1693 | &usess->metadata_attr); | |
7972aab2 DG |
1694 | |
1695 | switch (ua_sess->buffer_type) { | |
1696 | case LTTNG_BUFFER_PER_PID: | |
1697 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 1698 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
1699 | datetime); |
1700 | break; | |
1701 | case LTTNG_BUFFER_PER_UID: | |
1702 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1703 | DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long); | |
1704 | break; | |
1705 | default: | |
1706 | assert(0); | |
1707 | goto error; | |
1708 | } | |
477d7741 MD |
1709 | if (ret < 0) { |
1710 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1711 | assert(0); |
7972aab2 | 1712 | goto error; |
477d7741 MD |
1713 | } |
1714 | ||
3d071855 MD |
1715 | strncpy(ua_sess->root_shm_path, usess->root_shm_path, |
1716 | sizeof(ua_sess->root_shm_path)); | |
1717 | ua_sess->root_shm_path[sizeof(ua_sess->root_shm_path) - 1] = '\0'; | |
d7ba1388 MD |
1718 | strncpy(ua_sess->shm_path, usess->shm_path, |
1719 | sizeof(ua_sess->shm_path)); | |
1720 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
1721 | if (ua_sess->shm_path[0]) { | |
1722 | switch (ua_sess->buffer_type) { | |
1723 | case LTTNG_BUFFER_PER_PID: | |
1724 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
1725 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", | |
1726 | app->name, app->pid, datetime); | |
1727 | break; | |
1728 | case LTTNG_BUFFER_PER_UID: | |
1729 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
1730 | DEFAULT_UST_TRACE_UID_PATH, | |
1731 | app->uid, app->bits_per_long); | |
1732 | break; | |
1733 | default: | |
1734 | assert(0); | |
1735 | goto error; | |
1736 | } | |
1737 | if (ret < 0) { | |
1738 | PERROR("sprintf UST shadow copy session"); | |
1739 | assert(0); | |
1740 | goto error; | |
1741 | } | |
1742 | strncat(ua_sess->shm_path, tmp_shm_path, | |
1743 | sizeof(ua_sess->shm_path) - strlen(ua_sess->shm_path) - 1); | |
1744 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
1745 | } | |
1746 | ||
48842b30 | 1747 | /* Iterate over all channels in global domain. */ |
bec39940 DG |
1748 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, |
1749 | uchan, node.node) { | |
1750 | struct lttng_ht_iter uiter; | |
ba767faf | 1751 | |
bec39940 DG |
1752 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
1753 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
5b4a0ec0 | 1754 | if (ua_chan_node != NULL) { |
fc34caaa | 1755 | /* Session exist. Contiuing. */ |
5b4a0ec0 DG |
1756 | continue; |
1757 | } | |
421cb601 | 1758 | |
5b4a0ec0 DG |
1759 | DBG2("Channel %s not found on shadow session copy, creating it", |
1760 | uchan->name); | |
d0b96690 | 1761 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
5b4a0ec0 | 1762 | if (ua_chan == NULL) { |
fc34caaa | 1763 | /* malloc failed FIXME: Might want to do handle ENOMEM .. */ |
5b4a0ec0 | 1764 | continue; |
48842b30 | 1765 | } |
5b4a0ec0 | 1766 | shadow_copy_channel(ua_chan, uchan); |
ffe60014 DG |
1767 | /* |
1768 | * The concept of metadata channel does not exist on the tracing | |
1769 | * registry side of the session daemon so this can only be a per CPU | |
1770 | * channel and not metadata. | |
1771 | */ | |
1772 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
1773 | ||
bec39940 | 1774 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); |
48842b30 | 1775 | } |
7972aab2 DG |
1776 | |
1777 | error: | |
1778 | return; | |
48842b30 DG |
1779 | } |
1780 | ||
78f0bacd DG |
1781 | /* |
1782 | * Lookup sesison wrapper. | |
1783 | */ | |
84cd17c6 MD |
1784 | static |
1785 | void __lookup_session_by_app(struct ltt_ust_session *usess, | |
bec39940 | 1786 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1787 | { |
1788 | /* Get right UST app session from app */ | |
d9bf3ca4 | 1789 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
1790 | } |
1791 | ||
421cb601 DG |
1792 | /* |
1793 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1794 | * id. |
421cb601 | 1795 | */ |
48842b30 DG |
1796 | static struct ust_app_session *lookup_session_by_app( |
1797 | struct ltt_ust_session *usess, struct ust_app *app) | |
1798 | { | |
bec39940 | 1799 | struct lttng_ht_iter iter; |
d9bf3ca4 | 1800 | struct lttng_ht_node_u64 *node; |
48842b30 | 1801 | |
84cd17c6 | 1802 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 1803 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
1804 | if (node == NULL) { |
1805 | goto error; | |
1806 | } | |
1807 | ||
1808 | return caa_container_of(node, struct ust_app_session, node); | |
1809 | ||
1810 | error: | |
1811 | return NULL; | |
1812 | } | |
1813 | ||
7972aab2 DG |
1814 | /* |
1815 | * Setup buffer registry per PID for the given session and application. If none | |
1816 | * is found, a new one is created, added to the global registry and | |
1817 | * initialized. If regp is valid, it's set with the newly created object. | |
1818 | * | |
1819 | * Return 0 on success or else a negative value. | |
1820 | */ | |
1821 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
1822 | struct ust_app *app, struct buffer_reg_pid **regp) | |
1823 | { | |
1824 | int ret = 0; | |
1825 | struct buffer_reg_pid *reg_pid; | |
1826 | ||
1827 | assert(ua_sess); | |
1828 | assert(app); | |
1829 | ||
1830 | rcu_read_lock(); | |
1831 | ||
1832 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
1833 | if (!reg_pid) { | |
1834 | /* | |
1835 | * This is the create channel path meaning that if there is NO | |
1836 | * registry available, we have to create one for this session. | |
1837 | */ | |
d7ba1388 | 1838 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid, |
3d071855 | 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. */ | |
1848 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
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_pid->root_shm_path, |
1854 | reg_pid->shm_path, | |
d7ba1388 | 1855 | ua_sess->euid, ua_sess->egid); |
7972aab2 | 1856 | if (ret < 0) { |
286c991a MD |
1857 | /* |
1858 | * reg_pid->registry->reg.ust is NULL upon error, so we need to | |
1859 | * destroy the buffer registry, because it is always expected | |
1860 | * that if the buffer registry can be found, its ust registry is | |
1861 | * non-NULL. | |
1862 | */ | |
1863 | buffer_reg_pid_destroy(reg_pid); | |
7972aab2 DG |
1864 | goto error; |
1865 | } | |
1866 | ||
286c991a MD |
1867 | buffer_reg_pid_add(reg_pid); |
1868 | ||
7972aab2 DG |
1869 | DBG3("UST app buffer registry per PID created successfully"); |
1870 | ||
1871 | end: | |
1872 | if (regp) { | |
1873 | *regp = reg_pid; | |
1874 | } | |
1875 | error: | |
1876 | rcu_read_unlock(); | |
1877 | return ret; | |
1878 | } | |
1879 | ||
1880 | /* | |
1881 | * Setup buffer registry per UID for the given session and application. If none | |
1882 | * is found, a new one is created, added to the global registry and | |
1883 | * initialized. If regp is valid, it's set with the newly created object. | |
1884 | * | |
1885 | * Return 0 on success or else a negative value. | |
1886 | */ | |
1887 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
d7ba1388 | 1888 | struct ust_app_session *ua_sess, |
7972aab2 DG |
1889 | struct ust_app *app, struct buffer_reg_uid **regp) |
1890 | { | |
1891 | int ret = 0; | |
1892 | struct buffer_reg_uid *reg_uid; | |
1893 | ||
1894 | assert(usess); | |
1895 | assert(app); | |
1896 | ||
1897 | rcu_read_lock(); | |
1898 | ||
1899 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
1900 | if (!reg_uid) { | |
1901 | /* | |
1902 | * This is the create channel path meaning that if there is NO | |
1903 | * registry available, we have to create one for this session. | |
1904 | */ | |
1905 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
3d071855 MD |
1906 | LTTNG_DOMAIN_UST, ®_uid, |
1907 | ua_sess->root_shm_path, ua_sess->shm_path); | |
7972aab2 DG |
1908 | if (ret < 0) { |
1909 | goto error; | |
1910 | } | |
7972aab2 DG |
1911 | } else { |
1912 | goto end; | |
1913 | } | |
1914 | ||
1915 | /* Initialize registry. */ | |
af6142cf | 1916 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
1917 | app->bits_per_long, app->uint8_t_alignment, |
1918 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1919 | app->uint64_t_alignment, app->long_alignment, |
1920 | app->byte_order, app->version.major, | |
3d071855 MD |
1921 | app->version.minor, reg_uid->root_shm_path, |
1922 | reg_uid->shm_path, usess->uid, usess->gid); | |
7972aab2 | 1923 | if (ret < 0) { |
286c991a MD |
1924 | /* |
1925 | * reg_uid->registry->reg.ust is NULL upon error, so we need to | |
1926 | * destroy the buffer registry, because it is always expected | |
1927 | * that if the buffer registry can be found, its ust registry is | |
1928 | * non-NULL. | |
1929 | */ | |
1930 | buffer_reg_uid_destroy(reg_uid, NULL); | |
7972aab2 DG |
1931 | goto error; |
1932 | } | |
1933 | /* Add node to teardown list of the session. */ | |
1934 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
1935 | ||
286c991a | 1936 | buffer_reg_uid_add(reg_uid); |
7972aab2 | 1937 | |
286c991a | 1938 | DBG3("UST app buffer registry per UID created successfully"); |
7972aab2 DG |
1939 | end: |
1940 | if (regp) { | |
1941 | *regp = reg_uid; | |
1942 | } | |
1943 | error: | |
1944 | rcu_read_unlock(); | |
1945 | return ret; | |
1946 | } | |
1947 | ||
421cb601 | 1948 | /* |
3d8ca23b | 1949 | * Create a session on the tracer side for the given app. |
421cb601 | 1950 | * |
3d8ca23b DG |
1951 | * On success, ua_sess_ptr is populated with the session pointer or else left |
1952 | * untouched. If the session was created, is_created is set to 1. On error, | |
1953 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
1954 | * be NULL. | |
1955 | * | |
1956 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
1957 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 1958 | */ |
3d8ca23b DG |
1959 | static int create_ust_app_session(struct ltt_ust_session *usess, |
1960 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, | |
1961 | int *is_created) | |
421cb601 | 1962 | { |
3d8ca23b | 1963 | int ret, created = 0; |
421cb601 DG |
1964 | struct ust_app_session *ua_sess; |
1965 | ||
3d8ca23b DG |
1966 | assert(usess); |
1967 | assert(app); | |
1968 | assert(ua_sess_ptr); | |
1969 | ||
840cb59c | 1970 | health_code_update(); |
86acf0da | 1971 | |
421cb601 DG |
1972 | ua_sess = lookup_session_by_app(usess, app); |
1973 | if (ua_sess == NULL) { | |
d9bf3ca4 | 1974 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 1975 | app->pid, usess->id); |
d0b96690 | 1976 | ua_sess = alloc_ust_app_session(app); |
421cb601 DG |
1977 | if (ua_sess == NULL) { |
1978 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
1979 | ret = -ENOMEM; |
1980 | goto error; | |
421cb601 | 1981 | } |
477d7741 | 1982 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 1983 | created = 1; |
421cb601 DG |
1984 | } |
1985 | ||
7972aab2 DG |
1986 | switch (usess->buffer_type) { |
1987 | case LTTNG_BUFFER_PER_PID: | |
1988 | /* Init local registry. */ | |
1989 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 1990 | if (ret < 0) { |
e64207cf | 1991 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
1992 | goto error; |
1993 | } | |
1994 | break; | |
1995 | case LTTNG_BUFFER_PER_UID: | |
1996 | /* Look for a global registry. If none exists, create one. */ | |
d7ba1388 | 1997 | ret = setup_buffer_reg_uid(usess, ua_sess, app, NULL); |
7972aab2 | 1998 | if (ret < 0) { |
e64207cf | 1999 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2000 | goto error; |
2001 | } | |
2002 | break; | |
2003 | default: | |
2004 | assert(0); | |
2005 | ret = -EINVAL; | |
2006 | goto error; | |
2007 | } | |
2008 | ||
2009 | health_code_update(); | |
2010 | ||
2011 | if (ua_sess->handle == -1) { | |
2012 | ret = ustctl_create_session(app->sock); | |
2013 | if (ret < 0) { | |
2014 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
2015 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
2016 | app->pid, ret); |
2017 | } else { | |
2018 | DBG("UST app creating session failed. Application is dead"); | |
3757b385 DG |
2019 | /* |
2020 | * This is normal behavior, an application can die during the | |
2021 | * creation process. Don't report an error so the execution can | |
2022 | * continue normally. This will get flagged ENOTCONN and the | |
2023 | * caller will handle it. | |
2024 | */ | |
2025 | ret = 0; | |
ffe60014 | 2026 | } |
d0b96690 | 2027 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
2028 | if (ret != -ENOMEM) { |
2029 | /* | |
2030 | * Tracer is probably gone or got an internal error so let's | |
2031 | * behave like it will soon unregister or not usable. | |
2032 | */ | |
2033 | ret = -ENOTCONN; | |
2034 | } | |
2035 | goto error; | |
421cb601 DG |
2036 | } |
2037 | ||
7972aab2 DG |
2038 | ua_sess->handle = ret; |
2039 | ||
2040 | /* Add ust app session to app's HT */ | |
d9bf3ca4 MD |
2041 | lttng_ht_node_init_u64(&ua_sess->node, |
2042 | ua_sess->tracing_id); | |
2043 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
7972aab2 DG |
2044 | |
2045 | DBG2("UST app session created successfully with handle %d", ret); | |
2046 | } | |
2047 | ||
2048 | *ua_sess_ptr = ua_sess; | |
2049 | if (is_created) { | |
2050 | *is_created = created; | |
2051 | } | |
2052 | ||
2053 | /* Everything went well. */ | |
2054 | ret = 0; | |
2055 | ||
2056 | error: | |
2057 | health_code_update(); | |
2058 | return ret; | |
2059 | } | |
2060 | ||
6a6b2068 JG |
2061 | /* |
2062 | * Match function for a hash table lookup of ust_app_ctx. | |
2063 | * | |
2064 | * It matches an ust app context based on the context type and, in the case | |
2065 | * of perf counters, their name. | |
2066 | */ | |
2067 | static int ht_match_ust_app_ctx(struct cds_lfht_node *node, const void *_key) | |
2068 | { | |
2069 | struct ust_app_ctx *ctx; | |
2070 | const struct lttng_ust_context *key; | |
2071 | ||
2072 | assert(node); | |
2073 | assert(_key); | |
2074 | ||
2075 | ctx = caa_container_of(node, struct ust_app_ctx, node.node); | |
2076 | key = _key; | |
2077 | ||
2078 | /* Context type */ | |
2079 | if (ctx->ctx.ctx != key->ctx) { | |
2080 | goto no_match; | |
2081 | } | |
2082 | ||
2083 | /* Check the name in the case of perf thread counters. */ | |
2084 | if (key->ctx == LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER) { | |
2085 | if (strncmp(key->u.perf_counter.name, | |
2086 | ctx->ctx.u.perf_counter.name, | |
2087 | sizeof(key->u.perf_counter.name))) { | |
2088 | goto no_match; | |
2089 | } | |
2090 | } | |
2091 | ||
2092 | /* Match. */ | |
2093 | return 1; | |
2094 | ||
2095 | no_match: | |
2096 | return 0; | |
2097 | } | |
2098 | ||
2099 | /* | |
2100 | * Lookup for an ust app context from an lttng_ust_context. | |
2101 | * | |
be184a0f | 2102 | * Must be called while holding RCU read side lock. |
6a6b2068 JG |
2103 | * Return an ust_app_ctx object or NULL on error. |
2104 | */ | |
2105 | static | |
2106 | struct ust_app_ctx *find_ust_app_context(struct lttng_ht *ht, | |
2107 | struct lttng_ust_context *uctx) | |
2108 | { | |
2109 | struct lttng_ht_iter iter; | |
2110 | struct lttng_ht_node_ulong *node; | |
2111 | struct ust_app_ctx *app_ctx = NULL; | |
2112 | ||
2113 | assert(uctx); | |
2114 | assert(ht); | |
2115 | ||
2116 | /* Lookup using the lttng_ust_context_type and a custom match fct. */ | |
2117 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) uctx->ctx, lttng_ht_seed), | |
2118 | ht_match_ust_app_ctx, uctx, &iter.iter); | |
2119 | node = lttng_ht_iter_get_node_ulong(&iter); | |
2120 | if (!node) { | |
2121 | goto end; | |
2122 | } | |
2123 | ||
2124 | app_ctx = caa_container_of(node, struct ust_app_ctx, node); | |
2125 | ||
2126 | end: | |
2127 | return app_ctx; | |
2128 | } | |
2129 | ||
7972aab2 DG |
2130 | /* |
2131 | * Create a context for the channel on the tracer. | |
2132 | * | |
2133 | * Called with UST app session lock held and a RCU read side lock. | |
2134 | */ | |
2135 | static | |
2136 | int create_ust_app_channel_context(struct ust_app_session *ua_sess, | |
2137 | struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx, | |
2138 | struct ust_app *app) | |
2139 | { | |
2140 | int ret = 0; | |
7972aab2 DG |
2141 | struct ust_app_ctx *ua_ctx; |
2142 | ||
2143 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
2144 | ||
6a6b2068 JG |
2145 | ua_ctx = find_ust_app_context(ua_chan->ctx, uctx); |
2146 | if (ua_ctx) { | |
7972aab2 DG |
2147 | ret = -EEXIST; |
2148 | goto error; | |
2149 | } | |
2150 | ||
2151 | ua_ctx = alloc_ust_app_ctx(uctx); | |
2152 | if (ua_ctx == NULL) { | |
2153 | /* malloc failed */ | |
2154 | ret = -1; | |
2155 | goto error; | |
2156 | } | |
2157 | ||
2158 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 2159 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 2160 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
2161 | |
2162 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
2163 | if (ret < 0) { | |
2164 | goto error; | |
2165 | } | |
2166 | ||
2167 | error: | |
2168 | return ret; | |
2169 | } | |
2170 | ||
2171 | /* | |
2172 | * Enable on the tracer side a ust app event for the session and channel. | |
2173 | * | |
2174 | * Called with UST app session lock held. | |
2175 | */ | |
2176 | static | |
2177 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
2178 | struct ust_app_event *ua_event, struct ust_app *app) | |
2179 | { | |
2180 | int ret; | |
2181 | ||
2182 | ret = enable_ust_event(app, ua_sess, ua_event); | |
2183 | if (ret < 0) { | |
2184 | goto error; | |
2185 | } | |
2186 | ||
2187 | ua_event->enabled = 1; | |
2188 | ||
2189 | error: | |
2190 | return ret; | |
2191 | } | |
2192 | ||
2193 | /* | |
2194 | * Disable on the tracer side a ust app event for the session and channel. | |
2195 | */ | |
2196 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
2197 | struct ust_app_event *ua_event, struct ust_app *app) | |
2198 | { | |
2199 | int ret; | |
2200 | ||
2201 | ret = disable_ust_event(app, ua_sess, ua_event); | |
2202 | if (ret < 0) { | |
2203 | goto error; | |
2204 | } | |
2205 | ||
2206 | ua_event->enabled = 0; | |
2207 | ||
2208 | error: | |
2209 | return ret; | |
2210 | } | |
2211 | ||
2212 | /* | |
2213 | * Lookup ust app channel for session and disable it on the tracer side. | |
2214 | */ | |
2215 | static | |
2216 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
2217 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
2218 | { | |
2219 | int ret; | |
2220 | ||
2221 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2222 | if (ret < 0) { | |
2223 | goto error; | |
2224 | } | |
2225 | ||
2226 | ua_chan->enabled = 0; | |
2227 | ||
2228 | error: | |
2229 | return ret; | |
2230 | } | |
2231 | ||
2232 | /* | |
2233 | * Lookup ust app channel for session and enable it on the tracer side. This | |
2234 | * MUST be called with a RCU read side lock acquired. | |
2235 | */ | |
2236 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
2237 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
2238 | { | |
2239 | int ret = 0; | |
2240 | struct lttng_ht_iter iter; | |
2241 | struct lttng_ht_node_str *ua_chan_node; | |
2242 | struct ust_app_channel *ua_chan; | |
2243 | ||
2244 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
2245 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
2246 | if (ua_chan_node == NULL) { | |
d9bf3ca4 | 2247 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
2248 | uchan->name, ua_sess->tracing_id); |
2249 | goto error; | |
2250 | } | |
2251 | ||
2252 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2253 | ||
2254 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
2255 | if (ret < 0) { | |
2256 | goto error; | |
2257 | } | |
2258 | ||
2259 | error: | |
2260 | return ret; | |
2261 | } | |
2262 | ||
2263 | /* | |
2264 | * Ask the consumer to create a channel and get it if successful. | |
2265 | * | |
2266 | * Return 0 on success or else a negative value. | |
2267 | */ | |
2268 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
2269 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
2270 | int bitness, struct ust_registry_session *registry) | |
2271 | { | |
2272 | int ret; | |
2273 | unsigned int nb_fd = 0; | |
2274 | struct consumer_socket *socket; | |
2275 | ||
2276 | assert(usess); | |
2277 | assert(ua_sess); | |
2278 | assert(ua_chan); | |
2279 | assert(registry); | |
2280 | ||
2281 | rcu_read_lock(); | |
2282 | health_code_update(); | |
2283 | ||
2284 | /* Get the right consumer socket for the application. */ | |
2285 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
2286 | if (!socket) { | |
2287 | ret = -EINVAL; | |
2288 | goto error; | |
2289 | } | |
2290 | ||
2291 | health_code_update(); | |
2292 | ||
2293 | /* Need one fd for the channel. */ | |
2294 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2295 | if (ret < 0) { | |
2296 | ERR("Exhausted number of available FD upon create channel"); | |
2297 | goto error; | |
2298 | } | |
2299 | ||
2300 | /* | |
2301 | * Ask consumer to create channel. The consumer will return the number of | |
2302 | * stream we have to expect. | |
2303 | */ | |
2304 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
2305 | registry); | |
2306 | if (ret < 0) { | |
2307 | goto error_ask; | |
2308 | } | |
2309 | ||
2310 | /* | |
2311 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2312 | * stream (2 being the default value here). | |
2313 | */ | |
2314 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2315 | ||
2316 | /* Reserve the amount of file descriptor we need. */ | |
2317 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2318 | if (ret < 0) { | |
2319 | ERR("Exhausted number of available FD upon create channel"); | |
2320 | goto error_fd_get_stream; | |
2321 | } | |
2322 | ||
2323 | health_code_update(); | |
2324 | ||
2325 | /* | |
2326 | * Now get the channel from the consumer. This call wil populate the stream | |
2327 | * list of that channel and set the ust objects. | |
2328 | */ | |
d9078d0c DG |
2329 | if (usess->consumer->enabled) { |
2330 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2331 | if (ret < 0) { | |
2332 | goto error_destroy; | |
2333 | } | |
7972aab2 DG |
2334 | } |
2335 | ||
2336 | rcu_read_unlock(); | |
2337 | return 0; | |
2338 | ||
2339 | error_destroy: | |
2340 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2341 | error_fd_get_stream: | |
2342 | /* | |
2343 | * Initiate a destroy channel on the consumer since we had an error | |
2344 | * handling it on our side. The return value is of no importance since we | |
2345 | * already have a ret value set by the previous error that we need to | |
2346 | * return. | |
2347 | */ | |
2348 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2349 | error_ask: | |
2350 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2351 | error: | |
2352 | health_code_update(); | |
2353 | rcu_read_unlock(); | |
2354 | return ret; | |
2355 | } | |
2356 | ||
2357 | /* | |
2358 | * Duplicate the ust data object of the ust app stream and save it in the | |
2359 | * buffer registry stream. | |
2360 | * | |
2361 | * Return 0 on success or else a negative value. | |
2362 | */ | |
2363 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2364 | struct ust_app_stream *stream) | |
2365 | { | |
2366 | int ret; | |
2367 | ||
2368 | assert(reg_stream); | |
2369 | assert(stream); | |
2370 | ||
2371 | /* Reserve the amount of file descriptor we need. */ | |
2372 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2373 | if (ret < 0) { | |
2374 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2375 | goto error; | |
2376 | } | |
2377 | ||
2378 | /* Duplicate object for stream once the original is in the registry. */ | |
2379 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2380 | reg_stream->obj.ust); | |
2381 | if (ret < 0) { | |
2382 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2383 | reg_stream->obj.ust, stream->obj, ret); | |
2384 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2385 | goto error; | |
2386 | } | |
2387 | stream->handle = stream->obj->handle; | |
2388 | ||
2389 | error: | |
2390 | return ret; | |
2391 | } | |
2392 | ||
2393 | /* | |
2394 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2395 | * buffer registry channel. | |
2396 | * | |
2397 | * Return 0 on success or else a negative value. | |
2398 | */ | |
2399 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2400 | struct ust_app_channel *ua_chan) | |
2401 | { | |
2402 | int ret; | |
2403 | ||
2404 | assert(reg_chan); | |
2405 | assert(ua_chan); | |
2406 | ||
2407 | /* Need two fds for the channel. */ | |
2408 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2409 | if (ret < 0) { | |
2410 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2411 | goto error_fd_get; | |
2412 | } | |
2413 | ||
2414 | /* Duplicate object for stream once the original is in the registry. */ | |
2415 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2416 | if (ret < 0) { | |
2417 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2418 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2419 | goto error; | |
2420 | } | |
2421 | ua_chan->handle = ua_chan->obj->handle; | |
2422 | ||
2423 | return 0; | |
2424 | ||
2425 | error: | |
2426 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2427 | error_fd_get: | |
2428 | return ret; | |
2429 | } | |
2430 | ||
2431 | /* | |
2432 | * For a given channel buffer registry, setup all streams of the given ust | |
2433 | * application channel. | |
2434 | * | |
2435 | * Return 0 on success or else a negative value. | |
2436 | */ | |
2437 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
2438 | struct ust_app_channel *ua_chan) | |
2439 | { | |
2440 | int ret = 0; | |
2441 | struct ust_app_stream *stream, *stmp; | |
2442 | ||
2443 | assert(reg_chan); | |
2444 | assert(ua_chan); | |
2445 | ||
2446 | DBG2("UST app setup buffer registry stream"); | |
2447 | ||
2448 | /* Send all streams to application. */ | |
2449 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2450 | struct buffer_reg_stream *reg_stream; | |
2451 | ||
2452 | ret = buffer_reg_stream_create(®_stream); | |
2453 | if (ret < 0) { | |
2454 | goto error; | |
2455 | } | |
2456 | ||
2457 | /* | |
2458 | * Keep original pointer and nullify it in the stream so the delete | |
2459 | * stream call does not release the object. | |
2460 | */ | |
2461 | reg_stream->obj.ust = stream->obj; | |
2462 | stream->obj = NULL; | |
2463 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2464 | |
7972aab2 DG |
2465 | /* We don't need the streams anymore. */ |
2466 | cds_list_del(&stream->list); | |
2467 | delete_ust_app_stream(-1, stream); | |
2468 | } | |
421cb601 | 2469 | |
7972aab2 DG |
2470 | error: |
2471 | return ret; | |
2472 | } | |
2473 | ||
2474 | /* | |
2475 | * Create a buffer registry channel for the given session registry and | |
2476 | * application channel object. If regp pointer is valid, it's set with the | |
2477 | * created object. Important, the created object is NOT added to the session | |
2478 | * registry hash table. | |
2479 | * | |
2480 | * Return 0 on success else a negative value. | |
2481 | */ | |
2482 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2483 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2484 | { | |
2485 | int ret; | |
2486 | struct buffer_reg_channel *reg_chan = NULL; | |
2487 | ||
2488 | assert(reg_sess); | |
2489 | assert(ua_chan); | |
2490 | ||
2491 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2492 | ||
2493 | /* Create buffer registry channel. */ | |
2494 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2495 | if (ret < 0) { | |
2496 | goto error_create; | |
421cb601 | 2497 | } |
7972aab2 DG |
2498 | assert(reg_chan); |
2499 | reg_chan->consumer_key = ua_chan->key; | |
8c924c7b | 2500 | reg_chan->subbuf_size = ua_chan->attr.subbuf_size; |
d07ceecd | 2501 | reg_chan->num_subbuf = ua_chan->attr.num_subbuf; |
421cb601 | 2502 | |
7972aab2 DG |
2503 | /* Create and add a channel registry to session. */ |
2504 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2505 | ua_chan->tracing_channel_id); | |
2506 | if (ret < 0) { | |
2507 | goto error; | |
d88aee68 | 2508 | } |
7972aab2 | 2509 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2510 | |
7972aab2 DG |
2511 | if (regp) { |
2512 | *regp = reg_chan; | |
3d8ca23b | 2513 | } |
d88aee68 | 2514 | |
7972aab2 | 2515 | return 0; |
3d8ca23b DG |
2516 | |
2517 | error: | |
7972aab2 DG |
2518 | /* Safe because the registry channel object was not added to any HT. */ |
2519 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2520 | error_create: | |
3d8ca23b | 2521 | return ret; |
421cb601 DG |
2522 | } |
2523 | ||
55cc08a6 | 2524 | /* |
7972aab2 DG |
2525 | * Setup buffer registry channel for the given session registry and application |
2526 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2527 | * |
7972aab2 | 2528 | * Return 0 on success else a negative value. |
55cc08a6 | 2529 | */ |
7972aab2 DG |
2530 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
2531 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan) | |
55cc08a6 | 2532 | { |
7972aab2 | 2533 | int ret; |
55cc08a6 | 2534 | |
7972aab2 DG |
2535 | assert(reg_sess); |
2536 | assert(reg_chan); | |
2537 | assert(ua_chan); | |
2538 | assert(ua_chan->obj); | |
55cc08a6 | 2539 | |
7972aab2 | 2540 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2541 | |
7972aab2 DG |
2542 | /* Setup all streams for the registry. */ |
2543 | ret = setup_buffer_reg_streams(reg_chan, ua_chan); | |
2544 | if (ret < 0) { | |
55cc08a6 DG |
2545 | goto error; |
2546 | } | |
2547 | ||
7972aab2 DG |
2548 | reg_chan->obj.ust = ua_chan->obj; |
2549 | ua_chan->obj = NULL; | |
55cc08a6 | 2550 | |
7972aab2 | 2551 | return 0; |
55cc08a6 DG |
2552 | |
2553 | error: | |
7972aab2 DG |
2554 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2555 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2556 | return ret; |
2557 | } | |
2558 | ||
edb67388 | 2559 | /* |
7972aab2 | 2560 | * Send buffer registry channel to the application. |
d0b96690 | 2561 | * |
7972aab2 | 2562 | * Return 0 on success else a negative value. |
edb67388 | 2563 | */ |
7972aab2 DG |
2564 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2565 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2566 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2567 | { |
2568 | int ret; | |
7972aab2 | 2569 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2570 | |
7972aab2 DG |
2571 | assert(reg_chan); |
2572 | assert(app); | |
2573 | assert(ua_sess); | |
2574 | assert(ua_chan); | |
2575 | ||
2576 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2577 | ||
2578 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2579 | if (ret < 0) { |
2580 | goto error; | |
2581 | } | |
2582 | ||
7972aab2 DG |
2583 | /* Send channel to the application. */ |
2584 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
2585 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
2586 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
2587 | goto error; | |
2588 | } else if (ret < 0) { | |
7972aab2 DG |
2589 | goto error; |
2590 | } | |
2591 | ||
2592 | health_code_update(); | |
2593 | ||
2594 | /* Send all streams to application. */ | |
2595 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2596 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2597 | struct ust_app_stream stream; | |
2598 | ||
2599 | ret = duplicate_stream_object(reg_stream, &stream); | |
2600 | if (ret < 0) { | |
2601 | goto error_stream_unlock; | |
2602 | } | |
2603 | ||
2604 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2605 | if (ret < 0) { | |
8c067051 | 2606 | (void) release_ust_app_stream(-1, &stream); |
a7169585 MD |
2607 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
2608 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
2609 | goto error_stream_unlock; | |
2610 | } else if (ret < 0) { | |
2611 | goto error_stream_unlock; | |
2612 | } | |
7972aab2 DG |
2613 | goto error_stream_unlock; |
2614 | } | |
edb67388 | 2615 | |
7972aab2 DG |
2616 | /* |
2617 | * The return value is not important here. This function will output an | |
2618 | * error if needed. | |
2619 | */ | |
2620 | (void) release_ust_app_stream(-1, &stream); | |
2621 | } | |
2622 | ua_chan->is_sent = 1; | |
2623 | ||
2624 | error_stream_unlock: | |
2625 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2626 | error: |
2627 | return ret; | |
2628 | } | |
2629 | ||
9730260e | 2630 | /* |
7972aab2 DG |
2631 | * Create and send to the application the created buffers with per UID buffers. |
2632 | * | |
2633 | * Return 0 on success else a negative value. | |
9730260e | 2634 | */ |
7972aab2 DG |
2635 | static int create_channel_per_uid(struct ust_app *app, |
2636 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2637 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2638 | { |
2639 | int ret; | |
7972aab2 DG |
2640 | struct buffer_reg_uid *reg_uid; |
2641 | struct buffer_reg_channel *reg_chan; | |
9730260e | 2642 | |
7972aab2 DG |
2643 | assert(app); |
2644 | assert(usess); | |
2645 | assert(ua_sess); | |
2646 | assert(ua_chan); | |
2647 | ||
2648 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2649 | ||
2650 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2651 | /* | |
2652 | * The session creation handles the creation of this global registry | |
2653 | * object. If none can be find, there is a code flow problem or a | |
2654 | * teardown race. | |
2655 | */ | |
2656 | assert(reg_uid); | |
2657 | ||
2658 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2659 | reg_uid); | |
2660 | if (!reg_chan) { | |
2661 | /* Create the buffer registry channel object. */ | |
2662 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2663 | if (ret < 0) { | |
f14256d6 MD |
2664 | ERR("Error creating the UST channel \"%s\" registry instance", |
2665 | ua_chan->name); | |
7972aab2 DG |
2666 | goto error; |
2667 | } | |
2668 | assert(reg_chan); | |
2669 | ||
2670 | /* | |
2671 | * Create the buffers on the consumer side. This call populates the | |
2672 | * ust app channel object with all streams and data object. | |
2673 | */ | |
2674 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2675 | app->bits_per_long, reg_uid->registry->reg.ust); | |
2676 | if (ret < 0) { | |
f14256d6 MD |
2677 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
2678 | ua_chan->name); | |
2679 | ||
07d2ae95 DG |
2680 | /* |
2681 | * Let's remove the previously created buffer registry channel so | |
2682 | * it's not visible anymore in the session registry. | |
2683 | */ | |
2684 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, | |
2685 | ua_chan->tracing_channel_id); | |
2686 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
2687 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
7972aab2 DG |
2688 | goto error; |
2689 | } | |
2690 | ||
2691 | /* | |
2692 | * Setup the streams and add it to the session registry. | |
2693 | */ | |
2694 | ret = setup_buffer_reg_channel(reg_uid->registry, ua_chan, reg_chan); | |
2695 | if (ret < 0) { | |
f14256d6 MD |
2696 | ERR("Error setting up UST channel \"%s\"", |
2697 | ua_chan->name); | |
7972aab2 DG |
2698 | goto error; |
2699 | } | |
2700 | ||
2701 | } | |
2702 | ||
2703 | /* Send buffers to the application. */ | |
2704 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
9730260e | 2705 | if (ret < 0) { |
a7169585 MD |
2706 | if (ret != -ENOTCONN) { |
2707 | ERR("Error sending channel to application"); | |
2708 | } | |
9730260e DG |
2709 | goto error; |
2710 | } | |
2711 | ||
9730260e DG |
2712 | error: |
2713 | return ret; | |
2714 | } | |
2715 | ||
78f0bacd | 2716 | /* |
7972aab2 DG |
2717 | * Create and send to the application the created buffers with per PID buffers. |
2718 | * | |
2719 | * Return 0 on success else a negative value. | |
78f0bacd | 2720 | */ |
7972aab2 DG |
2721 | static int create_channel_per_pid(struct ust_app *app, |
2722 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2723 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2724 | { |
8535a6d9 | 2725 | int ret; |
7972aab2 | 2726 | struct ust_registry_session *registry; |
78f0bacd | 2727 | |
7972aab2 DG |
2728 | assert(app); |
2729 | assert(usess); | |
2730 | assert(ua_sess); | |
2731 | assert(ua_chan); | |
2732 | ||
2733 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2734 | ||
2735 | rcu_read_lock(); | |
2736 | ||
2737 | registry = get_session_registry(ua_sess); | |
2738 | assert(registry); | |
2739 | ||
2740 | /* Create and add a new channel registry to session. */ | |
2741 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd | 2742 | if (ret < 0) { |
f14256d6 MD |
2743 | ERR("Error creating the UST channel \"%s\" registry instance", |
2744 | ua_chan->name); | |
78f0bacd DG |
2745 | goto error; |
2746 | } | |
2747 | ||
7972aab2 DG |
2748 | /* Create and get channel on the consumer side. */ |
2749 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2750 | app->bits_per_long, registry); | |
2751 | if (ret < 0) { | |
f14256d6 MD |
2752 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
2753 | ua_chan->name); | |
7972aab2 DG |
2754 | goto error; |
2755 | } | |
2756 | ||
2757 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
2758 | if (ret < 0) { | |
a7169585 MD |
2759 | if (ret != -ENOTCONN) { |
2760 | ERR("Error sending channel to application"); | |
2761 | } | |
7972aab2 DG |
2762 | goto error; |
2763 | } | |
8535a6d9 | 2764 | |
78f0bacd | 2765 | error: |
7972aab2 | 2766 | rcu_read_unlock(); |
78f0bacd DG |
2767 | return ret; |
2768 | } | |
2769 | ||
2770 | /* | |
7972aab2 DG |
2771 | * From an already allocated ust app channel, create the channel buffers if |
2772 | * need and send it to the application. This MUST be called with a RCU read | |
2773 | * side lock acquired. | |
2774 | * | |
a7169585 MD |
2775 | * Return 0 on success or else a negative value. Returns -ENOTCONN if |
2776 | * the application exited concurrently. | |
78f0bacd | 2777 | */ |
7972aab2 DG |
2778 | static int do_create_channel(struct ust_app *app, |
2779 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2780 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2781 | { |
7972aab2 | 2782 | int ret; |
78f0bacd | 2783 | |
7972aab2 DG |
2784 | assert(app); |
2785 | assert(usess); | |
2786 | assert(ua_sess); | |
2787 | assert(ua_chan); | |
2788 | ||
2789 | /* Handle buffer type before sending the channel to the application. */ | |
2790 | switch (usess->buffer_type) { | |
2791 | case LTTNG_BUFFER_PER_UID: | |
2792 | { | |
2793 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
2794 | if (ret < 0) { | |
2795 | goto error; | |
2796 | } | |
2797 | break; | |
2798 | } | |
2799 | case LTTNG_BUFFER_PER_PID: | |
2800 | { | |
2801 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
2802 | if (ret < 0) { | |
2803 | goto error; | |
2804 | } | |
2805 | break; | |
2806 | } | |
2807 | default: | |
2808 | assert(0); | |
2809 | ret = -EINVAL; | |
78f0bacd DG |
2810 | goto error; |
2811 | } | |
2812 | ||
7972aab2 DG |
2813 | /* Initialize ust objd object using the received handle and add it. */ |
2814 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
2815 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 2816 | |
7972aab2 DG |
2817 | /* If channel is not enabled, disable it on the tracer */ |
2818 | if (!ua_chan->enabled) { | |
2819 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2820 | if (ret < 0) { | |
2821 | goto error; | |
2822 | } | |
78f0bacd DG |
2823 | } |
2824 | ||
2825 | error: | |
2826 | return ret; | |
2827 | } | |
2828 | ||
284d8f55 | 2829 | /* |
4d710ac2 DG |
2830 | * Create UST app channel and create it on the tracer. Set ua_chanp of the |
2831 | * newly created channel if not NULL. | |
d0b96690 | 2832 | * |
36b588ed | 2833 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 | 2834 | * |
a7169585 MD |
2835 | * Return 0 on success or else a negative value. Returns -ENOTCONN if |
2836 | * the application exited concurrently. | |
284d8f55 | 2837 | */ |
4d710ac2 DG |
2838 | static int create_ust_app_channel(struct ust_app_session *ua_sess, |
2839 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
7972aab2 | 2840 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 2841 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
2842 | { |
2843 | int ret = 0; | |
bec39940 DG |
2844 | struct lttng_ht_iter iter; |
2845 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
2846 | struct ust_app_channel *ua_chan; |
2847 | ||
2848 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
2849 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
2850 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 2851 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 2852 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 2853 | goto end; |
5b4a0ec0 DG |
2854 | } |
2855 | ||
d0b96690 | 2856 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
2857 | if (ua_chan == NULL) { |
2858 | /* Only malloc can fail here */ | |
4d710ac2 | 2859 | ret = -ENOMEM; |
094d1690 | 2860 | goto error_alloc; |
fc34caaa DG |
2861 | } |
2862 | shadow_copy_channel(ua_chan, uchan); | |
2863 | ||
ffe60014 DG |
2864 | /* Set channel type. */ |
2865 | ua_chan->attr.type = type; | |
2866 | ||
7972aab2 | 2867 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
5b4a0ec0 DG |
2868 | if (ret < 0) { |
2869 | goto error; | |
2870 | } | |
2871 | ||
fc34caaa | 2872 | DBG2("UST app create channel %s for PID %d completed", ua_chan->name, |
852d0037 | 2873 | app->pid); |
fc34caaa | 2874 | |
d0b96690 DG |
2875 | /* Only add the channel if successful on the tracer side. */ |
2876 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
2877 | ||
fc34caaa | 2878 | end: |
4d710ac2 DG |
2879 | if (ua_chanp) { |
2880 | *ua_chanp = ua_chan; | |
2881 | } | |
2882 | ||
2883 | /* Everything went well. */ | |
2884 | return 0; | |
5b4a0ec0 DG |
2885 | |
2886 | error: | |
d0b96690 | 2887 | delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app); |
094d1690 | 2888 | error_alloc: |
4d710ac2 | 2889 | return ret; |
5b4a0ec0 DG |
2890 | } |
2891 | ||
2892 | /* | |
2893 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
2894 | * |
2895 | * Called with ust app session mutex held. | |
5b4a0ec0 | 2896 | */ |
edb67388 DG |
2897 | static |
2898 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
2899 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
2900 | struct ust_app *app) | |
284d8f55 | 2901 | { |
edb67388 | 2902 | int ret = 0; |
5b4a0ec0 | 2903 | struct ust_app_event *ua_event; |
284d8f55 | 2904 | |
5b4a0ec0 | 2905 | /* Get event node */ |
18eace3b | 2906 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 2907 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 2908 | if (ua_event != NULL) { |
fc34caaa | 2909 | ret = -EEXIST; |
edb67388 DG |
2910 | goto end; |
2911 | } | |
5b4a0ec0 | 2912 | |
edb67388 DG |
2913 | /* Does not exist so create one */ |
2914 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); | |
2915 | if (ua_event == NULL) { | |
2916 | /* Only malloc can failed so something is really wrong */ | |
2917 | ret = -ENOMEM; | |
fc34caaa | 2918 | goto end; |
5b4a0ec0 | 2919 | } |
edb67388 | 2920 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 2921 | |
edb67388 | 2922 | /* Create it on the tracer side */ |
5b4a0ec0 | 2923 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 2924 | if (ret < 0) { |
fc34caaa | 2925 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 2926 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
2927 | goto error; |
2928 | } | |
2929 | ||
d0b96690 | 2930 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 2931 | |
fc34caaa | 2932 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 2933 | app->pid); |
7f79d3a1 | 2934 | |
edb67388 | 2935 | end: |
fc34caaa DG |
2936 | return ret; |
2937 | ||
5b4a0ec0 | 2938 | error: |
fc34caaa DG |
2939 | /* Valid. Calling here is already in a read side lock */ |
2940 | delete_ust_app_event(-1, ua_event); | |
edb67388 | 2941 | return ret; |
5b4a0ec0 DG |
2942 | } |
2943 | ||
2944 | /* | |
2945 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 2946 | * |
7972aab2 | 2947 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
2948 | */ |
2949 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
ad7a9107 | 2950 | struct ust_app *app, struct consumer_output *consumer) |
5b4a0ec0 DG |
2951 | { |
2952 | int ret = 0; | |
ffe60014 | 2953 | struct ust_app_channel *metadata; |
d88aee68 | 2954 | struct consumer_socket *socket; |
7972aab2 | 2955 | struct ust_registry_session *registry; |
5b4a0ec0 | 2956 | |
ffe60014 DG |
2957 | assert(ua_sess); |
2958 | assert(app); | |
d88aee68 | 2959 | assert(consumer); |
5b4a0ec0 | 2960 | |
7972aab2 DG |
2961 | registry = get_session_registry(ua_sess); |
2962 | assert(registry); | |
2963 | ||
ce34fcd0 MD |
2964 | pthread_mutex_lock(®istry->lock); |
2965 | ||
1b532a60 DG |
2966 | /* Metadata already exists for this registry or it was closed previously */ |
2967 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
2968 | ret = 0; |
2969 | goto error; | |
5b4a0ec0 DG |
2970 | } |
2971 | ||
ffe60014 | 2972 | /* Allocate UST metadata */ |
d0b96690 | 2973 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
2974 | if (!metadata) { |
2975 | /* malloc() failed */ | |
2976 | ret = -ENOMEM; | |
2977 | goto error; | |
2978 | } | |
5b4a0ec0 | 2979 | |
ad7a9107 | 2980 | memcpy(&metadata->attr, &ua_sess->metadata_attr, sizeof(metadata->attr)); |
5b4a0ec0 | 2981 | |
7972aab2 DG |
2982 | /* Need one fd for the channel. */ |
2983 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2984 | if (ret < 0) { | |
2985 | ERR("Exhausted number of available FD upon create metadata"); | |
2986 | goto error; | |
2987 | } | |
2988 | ||
4dc3dfc5 DG |
2989 | /* Get the right consumer socket for the application. */ |
2990 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
2991 | if (!socket) { | |
2992 | ret = -EINVAL; | |
2993 | goto error_consumer; | |
2994 | } | |
2995 | ||
331744e3 JD |
2996 | /* |
2997 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
2998 | * to the registry *before* we ask the consumer so we avoid the race of the | |
2999 | * consumer requesting the metadata and the ask_channel call on our side | |
3000 | * did not returned yet. | |
3001 | */ | |
3002 | registry->metadata_key = metadata->key; | |
3003 | ||
d88aee68 DG |
3004 | /* |
3005 | * Ask the metadata channel creation to the consumer. The metadata object | |
3006 | * will be created by the consumer and kept their. However, the stream is | |
3007 | * never added or monitored until we do a first push metadata to the | |
3008 | * consumer. | |
3009 | */ | |
7972aab2 DG |
3010 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
3011 | registry); | |
d88aee68 | 3012 | if (ret < 0) { |
f2a444f1 DG |
3013 | /* Nullify the metadata key so we don't try to close it later on. */ |
3014 | registry->metadata_key = 0; | |
d88aee68 DG |
3015 | goto error_consumer; |
3016 | } | |
3017 | ||
3018 | /* | |
3019 | * The setup command will make the metadata stream be sent to the relayd, | |
3020 | * if applicable, and the thread managing the metadatas. This is important | |
3021 | * because after this point, if an error occurs, the only way the stream | |
3022 | * can be deleted is to be monitored in the consumer. | |
3023 | */ | |
7972aab2 | 3024 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 3025 | if (ret < 0) { |
f2a444f1 DG |
3026 | /* Nullify the metadata key so we don't try to close it later on. */ |
3027 | registry->metadata_key = 0; | |
d88aee68 | 3028 | goto error_consumer; |
5b4a0ec0 DG |
3029 | } |
3030 | ||
7972aab2 DG |
3031 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
3032 | metadata->key, app->pid); | |
5b4a0ec0 | 3033 | |
d88aee68 | 3034 | error_consumer: |
b80f0b6c | 3035 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 3036 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 3037 | error: |
ce34fcd0 | 3038 | pthread_mutex_unlock(®istry->lock); |
ffe60014 | 3039 | return ret; |
5b4a0ec0 DG |
3040 | } |
3041 | ||
5b4a0ec0 | 3042 | /* |
d88aee68 DG |
3043 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
3044 | * acquired before calling this function. | |
5b4a0ec0 DG |
3045 | */ |
3046 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
3047 | { | |
d88aee68 | 3048 | struct ust_app *app = NULL; |
bec39940 DG |
3049 | struct lttng_ht_node_ulong *node; |
3050 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 3051 | |
bec39940 DG |
3052 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
3053 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
3054 | if (node == NULL) { |
3055 | DBG2("UST app no found with pid %d", pid); | |
3056 | goto error; | |
3057 | } | |
5b4a0ec0 DG |
3058 | |
3059 | DBG2("Found UST app by pid %d", pid); | |
3060 | ||
d88aee68 | 3061 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
3062 | |
3063 | error: | |
d88aee68 | 3064 | return app; |
5b4a0ec0 DG |
3065 | } |
3066 | ||
d88aee68 DG |
3067 | /* |
3068 | * Allocate and init an UST app object using the registration information and | |
3069 | * the command socket. This is called when the command socket connects to the | |
3070 | * session daemon. | |
3071 | * | |
3072 | * The object is returned on success or else NULL. | |
3073 | */ | |
d0b96690 | 3074 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 3075 | { |
d0b96690 DG |
3076 | struct ust_app *lta = NULL; |
3077 | ||
3078 | assert(msg); | |
3079 | assert(sock >= 0); | |
3080 | ||
3081 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 3082 | |
173af62f DG |
3083 | if ((msg->bits_per_long == 64 && |
3084 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
3085 | || (msg->bits_per_long == 32 && | |
3086 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 3087 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
3088 | "%d-bit long, but no consumerd for this size is available.\n", |
3089 | msg->name, msg->pid, msg->bits_per_long); | |
3090 | goto error; | |
3f2c5fcc | 3091 | } |
d0b96690 | 3092 | |
5b4a0ec0 DG |
3093 | lta = zmalloc(sizeof(struct ust_app)); |
3094 | if (lta == NULL) { | |
3095 | PERROR("malloc"); | |
d0b96690 | 3096 | goto error; |
5b4a0ec0 DG |
3097 | } |
3098 | ||
3099 | lta->ppid = msg->ppid; | |
3100 | lta->uid = msg->uid; | |
3101 | lta->gid = msg->gid; | |
d0b96690 | 3102 | |
7753dea8 | 3103 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
3104 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
3105 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
3106 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
3107 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
3108 | lta->long_alignment = msg->long_alignment; | |
3109 | lta->byte_order = msg->byte_order; | |
3110 | ||
5b4a0ec0 DG |
3111 | lta->v_major = msg->major; |
3112 | lta->v_minor = msg->minor; | |
d9bf3ca4 | 3113 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 DG |
3114 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
3115 | lta->notify_sock = -1; | |
d88aee68 DG |
3116 | |
3117 | /* Copy name and make sure it's NULL terminated. */ | |
3118 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
3119 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
3120 | ||
3121 | /* | |
3122 | * Before this can be called, when receiving the registration information, | |
3123 | * the application compatibility is checked. So, at this point, the | |
3124 | * application can work with this session daemon. | |
3125 | */ | |
d0b96690 | 3126 | lta->compatible = 1; |
5b4a0ec0 | 3127 | |
852d0037 | 3128 | lta->pid = msg->pid; |
d0b96690 | 3129 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 3130 | lta->sock = sock; |
d0b96690 | 3131 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 3132 | |
d42f20df DG |
3133 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
3134 | ||
d0b96690 DG |
3135 | error: |
3136 | return lta; | |
3137 | } | |
3138 | ||
d88aee68 DG |
3139 | /* |
3140 | * For a given application object, add it to every hash table. | |
3141 | */ | |
d0b96690 DG |
3142 | void ust_app_add(struct ust_app *app) |
3143 | { | |
3144 | assert(app); | |
3145 | assert(app->notify_sock >= 0); | |
3146 | ||
5b4a0ec0 | 3147 | rcu_read_lock(); |
852d0037 DG |
3148 | |
3149 | /* | |
3150 | * On a re-registration, we want to kick out the previous registration of | |
3151 | * that pid | |
3152 | */ | |
d0b96690 | 3153 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
3154 | |
3155 | /* | |
3156 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
3157 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
3158 | * already in the table. | |
3159 | */ | |
d0b96690 | 3160 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 3161 | |
d0b96690 DG |
3162 | /* Add application to the notify socket hash table. */ |
3163 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
3164 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 3165 | |
d0b96690 | 3166 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
3167 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
3168 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
3169 | app->v_minor); | |
5b4a0ec0 | 3170 | |
d0b96690 DG |
3171 | rcu_read_unlock(); |
3172 | } | |
3173 | ||
d88aee68 DG |
3174 | /* |
3175 | * Set the application version into the object. | |
3176 | * | |
3177 | * Return 0 on success else a negative value either an errno code or a | |
3178 | * LTTng-UST error code. | |
3179 | */ | |
d0b96690 DG |
3180 | int ust_app_version(struct ust_app *app) |
3181 | { | |
d88aee68 DG |
3182 | int ret; |
3183 | ||
d0b96690 | 3184 | assert(app); |
d88aee68 DG |
3185 | |
3186 | ret = ustctl_tracer_version(app->sock, &app->version); | |
3187 | if (ret < 0) { | |
3188 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
5368d366 | 3189 | ERR("UST app %d version failed with ret %d", app->sock, ret); |
d88aee68 | 3190 | } else { |
5368d366 | 3191 | DBG3("UST app %d version failed. Application is dead", app->sock); |
d88aee68 DG |
3192 | } |
3193 | } | |
3194 | ||
3195 | return ret; | |
5b4a0ec0 DG |
3196 | } |
3197 | ||
3198 | /* | |
3199 | * Unregister app by removing it from the global traceable app list and freeing | |
3200 | * the data struct. | |
3201 | * | |
3202 | * The socket is already closed at this point so no close to sock. | |
3203 | */ | |
3204 | void ust_app_unregister(int sock) | |
3205 | { | |
3206 | struct ust_app *lta; | |
bec39940 | 3207 | struct lttng_ht_node_ulong *node; |
c4b88406 | 3208 | struct lttng_ht_iter ust_app_sock_iter; |
bec39940 | 3209 | struct lttng_ht_iter iter; |
d42f20df | 3210 | struct ust_app_session *ua_sess; |
525b0740 | 3211 | int ret; |
5b4a0ec0 DG |
3212 | |
3213 | rcu_read_lock(); | |
886459c6 | 3214 | |
5b4a0ec0 | 3215 | /* Get the node reference for a call_rcu */ |
c4b88406 MD |
3216 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &ust_app_sock_iter); |
3217 | node = lttng_ht_iter_get_node_ulong(&ust_app_sock_iter); | |
d0b96690 | 3218 | assert(node); |
284d8f55 | 3219 | |
852d0037 | 3220 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
3221 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
3222 | ||
d88aee68 | 3223 | /* |
ce34fcd0 MD |
3224 | * For per-PID buffers, perform "push metadata" and flush all |
3225 | * application streams before removing app from hash tables, | |
3226 | * ensuring proper behavior of data_pending check. | |
c4b88406 | 3227 | * Remove sessions so they are not visible during deletion. |
d88aee68 | 3228 | */ |
d42f20df DG |
3229 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, |
3230 | node.node) { | |
7972aab2 DG |
3231 | struct ust_registry_session *registry; |
3232 | ||
d42f20df DG |
3233 | ret = lttng_ht_del(lta->sessions, &iter); |
3234 | if (ret) { | |
3235 | /* The session was already removed so scheduled for teardown. */ | |
3236 | continue; | |
3237 | } | |
3238 | ||
ce34fcd0 MD |
3239 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { |
3240 | (void) ust_app_flush_app_session(lta, ua_sess); | |
3241 | } | |
c4b88406 | 3242 | |
d42f20df DG |
3243 | /* |
3244 | * Add session to list for teardown. This is safe since at this point we | |
3245 | * are the only one using this list. | |
3246 | */ | |
d88aee68 DG |
3247 | pthread_mutex_lock(&ua_sess->lock); |
3248 | ||
b161602a MD |
3249 | if (ua_sess->deleted) { |
3250 | pthread_mutex_unlock(&ua_sess->lock); | |
3251 | continue; | |
3252 | } | |
3253 | ||
d88aee68 DG |
3254 | /* |
3255 | * Normally, this is done in the delete session process which is | |
3256 | * executed in the call rcu below. However, upon registration we can't | |
3257 | * afford to wait for the grace period before pushing data or else the | |
3258 | * data pending feature can race between the unregistration and stop | |
3259 | * command where the data pending command is sent *before* the grace | |
3260 | * period ended. | |
3261 | * | |
3262 | * The close metadata below nullifies the metadata pointer in the | |
3263 | * session so the delete session will NOT push/close a second time. | |
3264 | */ | |
7972aab2 | 3265 | registry = get_session_registry(ua_sess); |
ce34fcd0 | 3266 | if (registry) { |
7972aab2 DG |
3267 | /* Push metadata for application before freeing the application. */ |
3268 | (void) push_metadata(registry, ua_sess->consumer); | |
3269 | ||
3270 | /* | |
3271 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
3272 | * metadata only on destroy trace session in this case. Also, the |
3273 | * previous push metadata could have flag the metadata registry to | |
3274 | * close so don't send a close command if closed. | |
7972aab2 | 3275 | */ |
ce34fcd0 | 3276 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
3277 | /* And ask to close it for this session registry. */ |
3278 | (void) close_metadata(registry, ua_sess->consumer); | |
3279 | } | |
3280 | } | |
d42f20df | 3281 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
c4b88406 | 3282 | |
d88aee68 | 3283 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
3284 | } |
3285 | ||
c4b88406 MD |
3286 | /* Remove application from PID hash table */ |
3287 | ret = lttng_ht_del(ust_app_ht_by_sock, &ust_app_sock_iter); | |
3288 | assert(!ret); | |
3289 | ||
3290 | /* | |
3291 | * Remove application from notify hash table. The thread handling the | |
3292 | * notify socket could have deleted the node so ignore on error because | |
3293 | * either way it's valid. The close of that socket is handled by the other | |
3294 | * thread. | |
3295 | */ | |
3296 | iter.iter.node = <a->notify_sock_n.node; | |
3297 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3298 | ||
3299 | /* | |
3300 | * Ignore return value since the node might have been removed before by an | |
3301 | * add replace during app registration because the PID can be reassigned by | |
3302 | * the OS. | |
3303 | */ | |
3304 | iter.iter.node = <a->pid_n.node; | |
3305 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3306 | if (ret) { | |
3307 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
3308 | lta->pid); | |
3309 | } | |
3310 | ||
852d0037 DG |
3311 | /* Free memory */ |
3312 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
3313 | ||
5b4a0ec0 DG |
3314 | rcu_read_unlock(); |
3315 | return; | |
284d8f55 DG |
3316 | } |
3317 | ||
5b4a0ec0 DG |
3318 | /* |
3319 | * Fill events array with all events name of all registered apps. | |
3320 | */ | |
3321 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 3322 | { |
5b4a0ec0 DG |
3323 | int ret, handle; |
3324 | size_t nbmem, count = 0; | |
bec39940 | 3325 | struct lttng_ht_iter iter; |
5b4a0ec0 | 3326 | struct ust_app *app; |
c617c0c6 | 3327 | struct lttng_event *tmp_event; |
421cb601 | 3328 | |
5b4a0ec0 | 3329 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
3330 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
3331 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
3332 | PERROR("zmalloc ust app events"); |
3333 | ret = -ENOMEM; | |
421cb601 DG |
3334 | goto error; |
3335 | } | |
3336 | ||
5b4a0ec0 | 3337 | rcu_read_lock(); |
421cb601 | 3338 | |
852d0037 | 3339 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 3340 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 3341 | |
840cb59c | 3342 | health_code_update(); |
86acf0da | 3343 | |
e0c7ec2b DG |
3344 | if (!app->compatible) { |
3345 | /* | |
3346 | * TODO: In time, we should notice the caller of this error by | |
3347 | * telling him that this is a version error. | |
3348 | */ | |
3349 | continue; | |
3350 | } | |
852d0037 | 3351 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 3352 | if (handle < 0) { |
ffe60014 DG |
3353 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3354 | ERR("UST app list events getting handle failed for app pid %d", | |
3355 | app->pid); | |
3356 | } | |
5b4a0ec0 DG |
3357 | continue; |
3358 | } | |
421cb601 | 3359 | |
852d0037 | 3360 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 3361 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3362 | /* Handle ustctl error. */ |
3363 | if (ret < 0) { | |
a2ba1ab0 | 3364 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3365 | ERR("UST app tp list get failed for app %d with ret %d", |
3366 | app->sock, ret); | |
3367 | } else { | |
3368 | DBG3("UST app tp list get failed. Application is dead"); | |
3757b385 DG |
3369 | /* |
3370 | * This is normal behavior, an application can die during the | |
3371 | * creation process. Don't report an error so the execution can | |
3372 | * continue normally. Continue normal execution. | |
3373 | */ | |
3374 | break; | |
ffe60014 | 3375 | } |
98f595d4 | 3376 | free(tmp_event); |
ffe60014 DG |
3377 | goto rcu_error; |
3378 | } | |
3379 | ||
840cb59c | 3380 | health_code_update(); |
815564d8 | 3381 | if (count >= nbmem) { |
d7b3776f | 3382 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3383 | struct lttng_event *new_tmp_event; |
3384 | size_t new_nbmem; | |
3385 | ||
3386 | new_nbmem = nbmem << 1; | |
3387 | DBG2("Reallocating event list from %zu to %zu entries", | |
3388 | nbmem, new_nbmem); | |
3389 | new_tmp_event = realloc(tmp_event, | |
3390 | new_nbmem * sizeof(struct lttng_event)); | |
3391 | if (new_tmp_event == NULL) { | |
5b4a0ec0 | 3392 | PERROR("realloc ust app events"); |
c617c0c6 | 3393 | free(tmp_event); |
5b4a0ec0 DG |
3394 | ret = -ENOMEM; |
3395 | goto rcu_error; | |
3396 | } | |
53efb85a MD |
3397 | /* Zero the new memory */ |
3398 | memset(new_tmp_event + nbmem, 0, | |
3399 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
3400 | nbmem = new_nbmem; | |
3401 | tmp_event = new_tmp_event; | |
5b4a0ec0 | 3402 | } |
c617c0c6 MD |
3403 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
3404 | tmp_event[count].loglevel = uiter.loglevel; | |
3405 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
3406 | tmp_event[count].pid = app->pid; | |
3407 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 3408 | count++; |
421cb601 | 3409 | } |
421cb601 DG |
3410 | } |
3411 | ||
5b4a0ec0 | 3412 | ret = count; |
c617c0c6 | 3413 | *events = tmp_event; |
421cb601 | 3414 | |
5b4a0ec0 | 3415 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 3416 | |
5b4a0ec0 DG |
3417 | rcu_error: |
3418 | rcu_read_unlock(); | |
421cb601 | 3419 | error: |
840cb59c | 3420 | health_code_update(); |
5b4a0ec0 | 3421 | return ret; |
421cb601 DG |
3422 | } |
3423 | ||
f37d259d MD |
3424 | /* |
3425 | * Fill events array with all events name of all registered apps. | |
3426 | */ | |
3427 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
3428 | { | |
3429 | int ret, handle; | |
3430 | size_t nbmem, count = 0; | |
3431 | struct lttng_ht_iter iter; | |
3432 | struct ust_app *app; | |
c617c0c6 | 3433 | struct lttng_event_field *tmp_event; |
f37d259d MD |
3434 | |
3435 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
3436 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
3437 | if (tmp_event == NULL) { | |
f37d259d MD |
3438 | PERROR("zmalloc ust app event fields"); |
3439 | ret = -ENOMEM; | |
3440 | goto error; | |
3441 | } | |
3442 | ||
3443 | rcu_read_lock(); | |
3444 | ||
3445 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3446 | struct lttng_ust_field_iter uiter; | |
3447 | ||
840cb59c | 3448 | health_code_update(); |
86acf0da | 3449 | |
f37d259d MD |
3450 | if (!app->compatible) { |
3451 | /* | |
3452 | * TODO: In time, we should notice the caller of this error by | |
3453 | * telling him that this is a version error. | |
3454 | */ | |
3455 | continue; | |
3456 | } | |
3457 | handle = ustctl_tracepoint_field_list(app->sock); | |
3458 | if (handle < 0) { | |
ffe60014 DG |
3459 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3460 | ERR("UST app list field getting handle failed for app pid %d", | |
3461 | app->pid); | |
3462 | } | |
f37d259d MD |
3463 | continue; |
3464 | } | |
3465 | ||
3466 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 3467 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3468 | /* Handle ustctl error. */ |
3469 | if (ret < 0) { | |
a2ba1ab0 | 3470 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3471 | ERR("UST app tp list field failed for app %d with ret %d", |
3472 | app->sock, ret); | |
3473 | } else { | |
3474 | DBG3("UST app tp list field failed. Application is dead"); | |
3757b385 DG |
3475 | /* |
3476 | * This is normal behavior, an application can die during the | |
3477 | * creation process. Don't report an error so the execution can | |
98f595d4 | 3478 | * continue normally. Reset list and count for next app. |
3757b385 DG |
3479 | */ |
3480 | break; | |
ffe60014 | 3481 | } |
98f595d4 | 3482 | free(tmp_event); |
ffe60014 DG |
3483 | goto rcu_error; |
3484 | } | |
3485 | ||
840cb59c | 3486 | health_code_update(); |
f37d259d | 3487 | if (count >= nbmem) { |
d7b3776f | 3488 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3489 | struct lttng_event_field *new_tmp_event; |
3490 | size_t new_nbmem; | |
3491 | ||
3492 | new_nbmem = nbmem << 1; | |
3493 | DBG2("Reallocating event field list from %zu to %zu entries", | |
3494 | nbmem, new_nbmem); | |
3495 | new_tmp_event = realloc(tmp_event, | |
3496 | new_nbmem * sizeof(struct lttng_event_field)); | |
3497 | if (new_tmp_event == NULL) { | |
f37d259d | 3498 | PERROR("realloc ust app event fields"); |
c617c0c6 | 3499 | free(tmp_event); |
f37d259d MD |
3500 | ret = -ENOMEM; |
3501 | goto rcu_error; | |
3502 | } | |
53efb85a MD |
3503 | /* Zero the new memory */ |
3504 | memset(new_tmp_event + nbmem, 0, | |
3505 | (new_nbmem - nbmem) * sizeof(struct lttng_event_field)); | |
3506 | nbmem = new_nbmem; | |
3507 | tmp_event = new_tmp_event; | |
f37d259d | 3508 | } |
f37d259d | 3509 | |
c617c0c6 | 3510 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
2e84128e DG |
3511 | /* Mapping between these enums matches 1 to 1. */ |
3512 | tmp_event[count].type = (enum lttng_event_field_type) uiter.type; | |
c617c0c6 | 3513 | tmp_event[count].nowrite = uiter.nowrite; |
f37d259d | 3514 | |
c617c0c6 MD |
3515 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
3516 | tmp_event[count].event.loglevel = uiter.loglevel; | |
2e84128e | 3517 | tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; |
c617c0c6 MD |
3518 | tmp_event[count].event.pid = app->pid; |
3519 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
3520 | count++; |
3521 | } | |
3522 | } | |
3523 | ||
3524 | ret = count; | |
c617c0c6 | 3525 | *fields = tmp_event; |
f37d259d MD |
3526 | |
3527 | DBG2("UST app list event fields done (%zu events)", count); | |
3528 | ||
3529 | rcu_error: | |
3530 | rcu_read_unlock(); | |
3531 | error: | |
840cb59c | 3532 | health_code_update(); |
f37d259d MD |
3533 | return ret; |
3534 | } | |
3535 | ||
5b4a0ec0 DG |
3536 | /* |
3537 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
3538 | * |
3539 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
3540 | */ |
3541 | void ust_app_clean_list(void) | |
421cb601 | 3542 | { |
5b4a0ec0 | 3543 | int ret; |
659ed79f | 3544 | struct ust_app *app; |
bec39940 | 3545 | struct lttng_ht_iter iter; |
421cb601 | 3546 | |
5b4a0ec0 | 3547 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3548 | |
5b4a0ec0 | 3549 | rcu_read_lock(); |
421cb601 | 3550 | |
f1b711c4 MD |
3551 | if (ust_app_ht) { |
3552 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3553 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3554 | assert(!ret); | |
3555 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
3556 | } | |
421cb601 DG |
3557 | } |
3558 | ||
852d0037 | 3559 | /* Cleanup socket hash table */ |
f1b711c4 MD |
3560 | if (ust_app_ht_by_sock) { |
3561 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, | |
3562 | sock_n.node) { | |
3563 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); | |
3564 | assert(!ret); | |
3565 | } | |
bec39940 | 3566 | } |
852d0037 | 3567 | |
d88aee68 | 3568 | /* Cleanup notify socket hash table */ |
f1b711c4 MD |
3569 | if (ust_app_ht_by_notify_sock) { |
3570 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3571 | notify_sock_n.node) { | |
3572 | ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3573 | assert(!ret); | |
3574 | } | |
d88aee68 | 3575 | } |
36b588ed | 3576 | rcu_read_unlock(); |
d88aee68 | 3577 | |
bec39940 | 3578 | /* Destroy is done only when the ht is empty */ |
f1b711c4 MD |
3579 | if (ust_app_ht) { |
3580 | ht_cleanup_push(ust_app_ht); | |
3581 | } | |
3582 | if (ust_app_ht_by_sock) { | |
3583 | ht_cleanup_push(ust_app_ht_by_sock); | |
3584 | } | |
3585 | if (ust_app_ht_by_notify_sock) { | |
3586 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
3587 | } | |
5b4a0ec0 DG |
3588 | } |
3589 | ||
3590 | /* | |
3591 | * Init UST app hash table. | |
3592 | */ | |
57703f6e | 3593 | int ust_app_ht_alloc(void) |
5b4a0ec0 | 3594 | { |
bec39940 | 3595 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3596 | if (!ust_app_ht) { |
3597 | return -1; | |
3598 | } | |
852d0037 | 3599 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3600 | if (!ust_app_ht_by_sock) { |
3601 | return -1; | |
3602 | } | |
d0b96690 | 3603 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3604 | if (!ust_app_ht_by_notify_sock) { |
3605 | return -1; | |
3606 | } | |
3607 | return 0; | |
421cb601 DG |
3608 | } |
3609 | ||
78f0bacd DG |
3610 | /* |
3611 | * For a specific UST session, disable the channel for all registered apps. | |
3612 | */ | |
35a9059d | 3613 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3614 | struct ltt_ust_channel *uchan) |
3615 | { | |
3616 | int ret = 0; | |
bec39940 DG |
3617 | struct lttng_ht_iter iter; |
3618 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3619 | struct ust_app *app; |
3620 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3621 | struct ust_app_channel *ua_chan; |
78f0bacd DG |
3622 | |
3623 | if (usess == NULL || uchan == NULL) { | |
3624 | ERR("Disabling UST global channel with NULL values"); | |
3625 | ret = -1; | |
3626 | goto error; | |
3627 | } | |
3628 | ||
d9bf3ca4 | 3629 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 3630 | uchan->name, usess->id); |
78f0bacd DG |
3631 | |
3632 | rcu_read_lock(); | |
3633 | ||
3634 | /* For every registered applications */ | |
852d0037 | 3635 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3636 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3637 | if (!app->compatible) { |
3638 | /* | |
3639 | * TODO: In time, we should notice the caller of this error by | |
3640 | * telling him that this is a version error. | |
3641 | */ | |
3642 | continue; | |
3643 | } | |
78f0bacd DG |
3644 | ua_sess = lookup_session_by_app(usess, app); |
3645 | if (ua_sess == NULL) { | |
3646 | continue; | |
3647 | } | |
3648 | ||
8535a6d9 | 3649 | /* Get channel */ |
bec39940 DG |
3650 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3651 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
3652 | /* If the session if found for the app, the channel must be there */ |
3653 | assert(ua_chan_node); | |
3654 | ||
3655 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3656 | /* The channel must not be already disabled */ | |
3657 | assert(ua_chan->enabled == 1); | |
3658 | ||
3659 | /* Disable channel onto application */ | |
3660 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
3661 | if (ret < 0) { |
3662 | /* XXX: We might want to report this error at some point... */ | |
3663 | continue; | |
3664 | } | |
3665 | } | |
3666 | ||
3667 | rcu_read_unlock(); | |
3668 | ||
3669 | error: | |
3670 | return ret; | |
3671 | } | |
3672 | ||
3673 | /* | |
3674 | * For a specific UST session, enable the channel for all registered apps. | |
3675 | */ | |
35a9059d | 3676 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3677 | struct ltt_ust_channel *uchan) |
3678 | { | |
3679 | int ret = 0; | |
bec39940 | 3680 | struct lttng_ht_iter iter; |
78f0bacd DG |
3681 | struct ust_app *app; |
3682 | struct ust_app_session *ua_sess; | |
3683 | ||
3684 | if (usess == NULL || uchan == NULL) { | |
3685 | ERR("Adding UST global channel to NULL values"); | |
3686 | ret = -1; | |
3687 | goto error; | |
3688 | } | |
3689 | ||
d9bf3ca4 | 3690 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 3691 | uchan->name, usess->id); |
78f0bacd DG |
3692 | |
3693 | rcu_read_lock(); | |
3694 | ||
3695 | /* For every registered applications */ | |
852d0037 | 3696 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3697 | if (!app->compatible) { |
3698 | /* | |
3699 | * TODO: In time, we should notice the caller of this error by | |
3700 | * telling him that this is a version error. | |
3701 | */ | |
3702 | continue; | |
3703 | } | |
78f0bacd DG |
3704 | ua_sess = lookup_session_by_app(usess, app); |
3705 | if (ua_sess == NULL) { | |
3706 | continue; | |
3707 | } | |
3708 | ||
3709 | /* Enable channel onto application */ | |
3710 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
3711 | if (ret < 0) { | |
3712 | /* XXX: We might want to report this error at some point... */ | |
3713 | continue; | |
3714 | } | |
3715 | } | |
3716 | ||
3717 | rcu_read_unlock(); | |
3718 | ||
3719 | error: | |
3720 | return ret; | |
3721 | } | |
3722 | ||
b0a40d28 DG |
3723 | /* |
3724 | * Disable an event in a channel and for a specific session. | |
3725 | */ | |
35a9059d DG |
3726 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
3727 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
3728 | { |
3729 | int ret = 0; | |
bec39940 DG |
3730 | struct lttng_ht_iter iter, uiter; |
3731 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
b0a40d28 DG |
3732 | struct ust_app *app; |
3733 | struct ust_app_session *ua_sess; | |
3734 | struct ust_app_channel *ua_chan; | |
3735 | struct ust_app_event *ua_event; | |
3736 | ||
3737 | DBG("UST app disabling event %s for all apps in channel " | |
d9bf3ca4 MD |
3738 | "%s for session id %" PRIu64, |
3739 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
3740 | |
3741 | rcu_read_lock(); | |
3742 | ||
3743 | /* For all registered applications */ | |
852d0037 | 3744 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3745 | if (!app->compatible) { |
3746 | /* | |
3747 | * TODO: In time, we should notice the caller of this error by | |
3748 | * telling him that this is a version error. | |
3749 | */ | |
3750 | continue; | |
3751 | } | |
b0a40d28 DG |
3752 | ua_sess = lookup_session_by_app(usess, app); |
3753 | if (ua_sess == NULL) { | |
3754 | /* Next app */ | |
3755 | continue; | |
3756 | } | |
3757 | ||
3758 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3759 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3760 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 3761 | if (ua_chan_node == NULL) { |
d9bf3ca4 | 3762 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 3763 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
3764 | continue; |
3765 | } | |
3766 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3767 | ||
bec39940 DG |
3768 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter); |
3769 | ua_event_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 DG |
3770 | if (ua_event_node == NULL) { |
3771 | DBG2("Event %s not found in channel %s for app pid %d." | |
852d0037 | 3772 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
3773 | continue; |
3774 | } | |
3775 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
3776 | ||
7f79d3a1 | 3777 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
3778 | if (ret < 0) { |
3779 | /* XXX: Report error someday... */ | |
3780 | continue; | |
3781 | } | |
3782 | } | |
3783 | ||
3784 | rcu_read_unlock(); | |
3785 | ||
3786 | return ret; | |
3787 | } | |
3788 | ||
421cb601 | 3789 | /* |
5b4a0ec0 | 3790 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 3791 | */ |
35a9059d | 3792 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3793 | struct ltt_ust_channel *uchan) |
3794 | { | |
3d8ca23b | 3795 | int ret = 0, created; |
bec39940 | 3796 | struct lttng_ht_iter iter; |
48842b30 | 3797 | struct ust_app *app; |
3d8ca23b | 3798 | struct ust_app_session *ua_sess = NULL; |
48842b30 | 3799 | |
fc34caaa DG |
3800 | /* Very wrong code flow */ |
3801 | assert(usess); | |
3802 | assert(uchan); | |
421cb601 | 3803 | |
d9bf3ca4 | 3804 | DBG2("UST app adding channel %s to UST domain for session id %" PRIu64, |
a991f516 | 3805 | uchan->name, usess->id); |
48842b30 DG |
3806 | |
3807 | rcu_read_lock(); | |
421cb601 | 3808 | |
5b4a0ec0 | 3809 | /* For every registered applications */ |
852d0037 | 3810 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3811 | if (!app->compatible) { |
3812 | /* | |
3813 | * TODO: In time, we should notice the caller of this error by | |
3814 | * telling him that this is a version error. | |
3815 | */ | |
3816 | continue; | |
3817 | } | |
a9ad0c8f MD |
3818 | if (!trace_ust_pid_tracker_lookup(usess, app->pid)) { |
3819 | /* Skip. */ | |
3820 | continue; | |
3821 | } | |
3822 | ||
edb67388 DG |
3823 | /* |
3824 | * Create session on the tracer side and add it to app session HT. Note | |
3825 | * that if session exist, it will simply return a pointer to the ust | |
3826 | * app session. | |
3827 | */ | |
3d8ca23b DG |
3828 | ret = create_ust_app_session(usess, app, &ua_sess, &created); |
3829 | if (ret < 0) { | |
3830 | switch (ret) { | |
3831 | case -ENOTCONN: | |
3832 | /* | |
3833 | * The application's socket is not valid. Either a bad socket | |
3834 | * or a timeout on it. We can't inform the caller that for a | |
3835 | * specific app, the session failed so lets continue here. | |
3836 | */ | |
a7169585 | 3837 | ret = 0; /* Not an error. */ |
3d8ca23b DG |
3838 | continue; |
3839 | case -ENOMEM: | |
3840 | default: | |
3841 | goto error_rcu_unlock; | |
3842 | } | |
48842b30 | 3843 | } |
3d8ca23b | 3844 | assert(ua_sess); |
48842b30 | 3845 | |
d0b96690 | 3846 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
3847 | |
3848 | if (ua_sess->deleted) { | |
3849 | pthread_mutex_unlock(&ua_sess->lock); | |
3850 | continue; | |
3851 | } | |
3852 | ||
d65d2de8 DG |
3853 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, |
3854 | sizeof(uchan->name))) { | |
ad7a9107 DG |
3855 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, &uchan->attr); |
3856 | ret = 0; | |
d65d2de8 DG |
3857 | } else { |
3858 | /* Create channel onto application. We don't need the chan ref. */ | |
3859 | ret = create_ust_app_channel(ua_sess, uchan, app, | |
3860 | LTTNG_UST_CHAN_PER_CPU, usess, NULL); | |
3861 | } | |
d0b96690 | 3862 | pthread_mutex_unlock(&ua_sess->lock); |
3d8ca23b | 3863 | if (ret < 0) { |
3d8ca23b DG |
3864 | /* Cleanup the created session if it's the case. */ |
3865 | if (created) { | |
d0b96690 | 3866 | destroy_app_session(app, ua_sess); |
3d8ca23b | 3867 | } |
a7169585 MD |
3868 | switch (ret) { |
3869 | case -ENOTCONN: | |
3870 | /* | |
3871 | * The application's socket is not valid. Either a bad socket | |
3872 | * or a timeout on it. We can't inform the caller that for a | |
3873 | * specific app, the session failed so lets continue here. | |
3874 | */ | |
3875 | ret = 0; /* Not an error. */ | |
3876 | continue; | |
3877 | case -ENOMEM: | |
3878 | default: | |
3879 | goto error_rcu_unlock; | |
3880 | } | |
48842b30 | 3881 | } |
48842b30 | 3882 | } |
5b4a0ec0 | 3883 | |
95e047ff | 3884 | error_rcu_unlock: |
48842b30 | 3885 | rcu_read_unlock(); |
3c14c33f | 3886 | return ret; |
48842b30 DG |
3887 | } |
3888 | ||
5b4a0ec0 | 3889 | /* |
edb67388 | 3890 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 3891 | */ |
35a9059d | 3892 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3893 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3894 | { | |
3895 | int ret = 0; | |
bec39940 | 3896 | struct lttng_ht_iter iter, uiter; |
18eace3b | 3897 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
3898 | struct ust_app *app; |
3899 | struct ust_app_session *ua_sess; | |
3900 | struct ust_app_channel *ua_chan; | |
3901 | struct ust_app_event *ua_event; | |
48842b30 | 3902 | |
d9bf3ca4 | 3903 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 3904 | uevent->attr.name, usess->id); |
48842b30 | 3905 | |
edb67388 DG |
3906 | /* |
3907 | * NOTE: At this point, this function is called only if the session and | |
3908 | * channel passed are already created for all apps. and enabled on the | |
3909 | * tracer also. | |
3910 | */ | |
3911 | ||
48842b30 | 3912 | rcu_read_lock(); |
421cb601 DG |
3913 | |
3914 | /* For all registered applications */ | |
852d0037 | 3915 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3916 | if (!app->compatible) { |
3917 | /* | |
3918 | * TODO: In time, we should notice the caller of this error by | |
3919 | * telling him that this is a version error. | |
3920 | */ | |
3921 | continue; | |
3922 | } | |
edb67388 | 3923 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3924 | if (!ua_sess) { |
3925 | /* The application has problem or is probably dead. */ | |
3926 | continue; | |
3927 | } | |
ba767faf | 3928 | |
d0b96690 DG |
3929 | pthread_mutex_lock(&ua_sess->lock); |
3930 | ||
b161602a MD |
3931 | if (ua_sess->deleted) { |
3932 | pthread_mutex_unlock(&ua_sess->lock); | |
3933 | continue; | |
3934 | } | |
3935 | ||
edb67388 | 3936 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3937 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3938 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
a7169585 MD |
3939 | /* |
3940 | * It is possible that the channel cannot be found is | |
3941 | * the channel/event creation occurs concurrently with | |
3942 | * an application exit. | |
3943 | */ | |
3944 | if (!ua_chan_node) { | |
3945 | pthread_mutex_unlock(&ua_sess->lock); | |
3946 | continue; | |
3947 | } | |
edb67388 DG |
3948 | |
3949 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3950 | ||
18eace3b DG |
3951 | /* Get event node */ |
3952 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
39c5a3a7 | 3953 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 3954 | if (ua_event == NULL) { |
7f79d3a1 | 3955 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 3956 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 3957 | goto next_app; |
35a9059d | 3958 | } |
35a9059d DG |
3959 | |
3960 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
3961 | if (ret < 0) { | |
d0b96690 | 3962 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 3963 | goto error; |
48842b30 | 3964 | } |
d0b96690 DG |
3965 | next_app: |
3966 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
3967 | } |
3968 | ||
7f79d3a1 | 3969 | error: |
edb67388 | 3970 | rcu_read_unlock(); |
edb67388 DG |
3971 | return ret; |
3972 | } | |
3973 | ||
3974 | /* | |
3975 | * For a specific existing UST session and UST channel, creates the event for | |
3976 | * all registered apps. | |
3977 | */ | |
35a9059d | 3978 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
3979 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3980 | { | |
3981 | int ret = 0; | |
bec39940 DG |
3982 | struct lttng_ht_iter iter, uiter; |
3983 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
3984 | struct ust_app *app; |
3985 | struct ust_app_session *ua_sess; | |
3986 | struct ust_app_channel *ua_chan; | |
3987 | ||
d9bf3ca4 | 3988 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 3989 | uevent->attr.name, usess->id); |
edb67388 | 3990 | |
edb67388 DG |
3991 | rcu_read_lock(); |
3992 | ||
3993 | /* For all registered applications */ | |
852d0037 | 3994 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3995 | if (!app->compatible) { |
3996 | /* | |
3997 | * TODO: In time, we should notice the caller of this error by | |
3998 | * telling him that this is a version error. | |
3999 | */ | |
4000 | continue; | |
4001 | } | |
edb67388 | 4002 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4003 | if (!ua_sess) { |
4004 | /* The application has problem or is probably dead. */ | |
4005 | continue; | |
4006 | } | |
48842b30 | 4007 | |
d0b96690 | 4008 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
4009 | |
4010 | if (ua_sess->deleted) { | |
4011 | pthread_mutex_unlock(&ua_sess->lock); | |
4012 | continue; | |
4013 | } | |
4014 | ||
48842b30 | 4015 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4016 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4017 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
4018 | /* If the channel is not found, there is a code flow error */ |
4019 | assert(ua_chan_node); | |
4020 | ||
48842b30 DG |
4021 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
4022 | ||
edb67388 | 4023 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 4024 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 4025 | if (ret < 0) { |
49c336c1 | 4026 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
4027 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
4028 | break; | |
4029 | } | |
4030 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 4031 | uevent->attr.name, app->pid); |
5b4a0ec0 | 4032 | continue; |
48842b30 | 4033 | } |
48842b30 | 4034 | } |
5b4a0ec0 | 4035 | |
48842b30 DG |
4036 | rcu_read_unlock(); |
4037 | ||
4038 | return ret; | |
4039 | } | |
4040 | ||
5b4a0ec0 DG |
4041 | /* |
4042 | * Start tracing for a specific UST session and app. | |
4043 | */ | |
b34cbebf | 4044 | static |
421cb601 | 4045 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
4046 | { |
4047 | int ret = 0; | |
48842b30 | 4048 | struct ust_app_session *ua_sess; |
48842b30 | 4049 | |
852d0037 | 4050 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 4051 | |
509cbaf8 MD |
4052 | rcu_read_lock(); |
4053 | ||
e0c7ec2b DG |
4054 | if (!app->compatible) { |
4055 | goto end; | |
4056 | } | |
4057 | ||
421cb601 DG |
4058 | ua_sess = lookup_session_by_app(usess, app); |
4059 | if (ua_sess == NULL) { | |
d42f20df DG |
4060 | /* The session is in teardown process. Ignore and continue. */ |
4061 | goto end; | |
421cb601 | 4062 | } |
48842b30 | 4063 | |
d0b96690 DG |
4064 | pthread_mutex_lock(&ua_sess->lock); |
4065 | ||
b161602a MD |
4066 | if (ua_sess->deleted) { |
4067 | pthread_mutex_unlock(&ua_sess->lock); | |
4068 | goto end; | |
4069 | } | |
4070 | ||
aea829b3 DG |
4071 | /* Upon restart, we skip the setup, already done */ |
4072 | if (ua_sess->started) { | |
8be98f9a | 4073 | goto skip_setup; |
aea829b3 | 4074 | } |
8be98f9a | 4075 | |
a4b92340 DG |
4076 | /* Create directories if consumer is LOCAL and has a path defined. */ |
4077 | if (usess->consumer->type == CONSUMER_DST_LOCAL && | |
4078 | strlen(usess->consumer->dst.trace_path) > 0) { | |
4079 | ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path, | |
7972aab2 | 4080 | S_IRWXU | S_IRWXG, ua_sess->euid, ua_sess->egid); |
a4b92340 DG |
4081 | if (ret < 0) { |
4082 | if (ret != -EEXIST) { | |
4083 | ERR("Trace directory creation error"); | |
d0b96690 | 4084 | goto error_unlock; |
421cb601 | 4085 | } |
173af62f | 4086 | } |
7753dea8 | 4087 | } |
aea829b3 | 4088 | |
d65d2de8 DG |
4089 | /* |
4090 | * Create the metadata for the application. This returns gracefully if a | |
4091 | * metadata was already set for the session. | |
4092 | */ | |
ad7a9107 | 4093 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer); |
421cb601 | 4094 | if (ret < 0) { |
d0b96690 | 4095 | goto error_unlock; |
421cb601 | 4096 | } |
48842b30 | 4097 | |
840cb59c | 4098 | health_code_update(); |
86acf0da | 4099 | |
8be98f9a | 4100 | skip_setup: |
421cb601 | 4101 | /* This start the UST tracing */ |
852d0037 | 4102 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
421cb601 | 4103 | if (ret < 0) { |
ffe60014 DG |
4104 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4105 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
4106 | app->pid, ret); | |
4107 | } else { | |
4108 | DBG("UST app start session failed. Application is dead."); | |
3757b385 DG |
4109 | /* |
4110 | * This is normal behavior, an application can die during the | |
4111 | * creation process. Don't report an error so the execution can | |
4112 | * continue normally. | |
4113 | */ | |
4114 | pthread_mutex_unlock(&ua_sess->lock); | |
4115 | goto end; | |
ffe60014 | 4116 | } |
d0b96690 | 4117 | goto error_unlock; |
421cb601 | 4118 | } |
5b4a0ec0 | 4119 | |
55c3953d DG |
4120 | /* Indicate that the session has been started once */ |
4121 | ua_sess->started = 1; | |
4122 | ||
d0b96690 DG |
4123 | pthread_mutex_unlock(&ua_sess->lock); |
4124 | ||
840cb59c | 4125 | health_code_update(); |
86acf0da | 4126 | |
421cb601 | 4127 | /* Quiescent wait after starting trace */ |
ffe60014 DG |
4128 | ret = ustctl_wait_quiescent(app->sock); |
4129 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4130 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4131 | app->pid, ret); | |
4132 | } | |
48842b30 | 4133 | |
e0c7ec2b DG |
4134 | end: |
4135 | rcu_read_unlock(); | |
840cb59c | 4136 | health_code_update(); |
421cb601 | 4137 | return 0; |
48842b30 | 4138 | |
d0b96690 DG |
4139 | error_unlock: |
4140 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 4141 | rcu_read_unlock(); |
840cb59c | 4142 | health_code_update(); |
421cb601 DG |
4143 | return -1; |
4144 | } | |
48842b30 | 4145 | |
8be98f9a MD |
4146 | /* |
4147 | * Stop tracing for a specific UST session and app. | |
4148 | */ | |
b34cbebf | 4149 | static |
8be98f9a MD |
4150 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
4151 | { | |
4152 | int ret = 0; | |
4153 | struct ust_app_session *ua_sess; | |
7972aab2 | 4154 | struct ust_registry_session *registry; |
8be98f9a | 4155 | |
852d0037 | 4156 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
4157 | |
4158 | rcu_read_lock(); | |
4159 | ||
e0c7ec2b | 4160 | if (!app->compatible) { |
d88aee68 | 4161 | goto end_no_session; |
e0c7ec2b DG |
4162 | } |
4163 | ||
8be98f9a MD |
4164 | ua_sess = lookup_session_by_app(usess, app); |
4165 | if (ua_sess == NULL) { | |
d88aee68 | 4166 | goto end_no_session; |
8be98f9a MD |
4167 | } |
4168 | ||
d88aee68 DG |
4169 | pthread_mutex_lock(&ua_sess->lock); |
4170 | ||
b161602a MD |
4171 | if (ua_sess->deleted) { |
4172 | pthread_mutex_unlock(&ua_sess->lock); | |
4173 | goto end_no_session; | |
4174 | } | |
4175 | ||
9bc07046 DG |
4176 | /* |
4177 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
4178 | * that was never started. It's possible since we can have a fail start |
4179 | * from either the application manager thread or the command thread. Simply | |
4180 | * indicate that this is a stop error. | |
9bc07046 | 4181 | */ |
f9dfc3d9 | 4182 | if (!ua_sess->started) { |
c45536e1 DG |
4183 | goto error_rcu_unlock; |
4184 | } | |
7db205b5 | 4185 | |
840cb59c | 4186 | health_code_update(); |
86acf0da | 4187 | |
9d6c7d3f | 4188 | /* This inhibits UST tracing */ |
852d0037 | 4189 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
9d6c7d3f | 4190 | if (ret < 0) { |
ffe60014 DG |
4191 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4192 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
4193 | app->pid, ret); | |
4194 | } else { | |
4195 | DBG("UST app stop session failed. Application is dead."); | |
3757b385 DG |
4196 | /* |
4197 | * This is normal behavior, an application can die during the | |
4198 | * creation process. Don't report an error so the execution can | |
4199 | * continue normally. | |
4200 | */ | |
4201 | goto end_unlock; | |
ffe60014 | 4202 | } |
9d6c7d3f DG |
4203 | goto error_rcu_unlock; |
4204 | } | |
4205 | ||
840cb59c | 4206 | health_code_update(); |
86acf0da | 4207 | |
9d6c7d3f | 4208 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
4209 | ret = ustctl_wait_quiescent(app->sock); |
4210 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4211 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4212 | app->pid, ret); | |
4213 | } | |
9d6c7d3f | 4214 | |
840cb59c | 4215 | health_code_update(); |
86acf0da | 4216 | |
b34cbebf MD |
4217 | registry = get_session_registry(ua_sess); |
4218 | assert(registry); | |
1b532a60 | 4219 | |
ce34fcd0 MD |
4220 | /* Push metadata for application before freeing the application. */ |
4221 | (void) push_metadata(registry, ua_sess->consumer); | |
b34cbebf | 4222 | |
3757b385 | 4223 | end_unlock: |
b34cbebf MD |
4224 | pthread_mutex_unlock(&ua_sess->lock); |
4225 | end_no_session: | |
4226 | rcu_read_unlock(); | |
4227 | health_code_update(); | |
4228 | return 0; | |
4229 | ||
4230 | error_rcu_unlock: | |
4231 | pthread_mutex_unlock(&ua_sess->lock); | |
4232 | rcu_read_unlock(); | |
4233 | health_code_update(); | |
4234 | return -1; | |
4235 | } | |
4236 | ||
b34cbebf | 4237 | static |
c4b88406 MD |
4238 | int ust_app_flush_app_session(struct ust_app *app, |
4239 | struct ust_app_session *ua_sess) | |
b34cbebf | 4240 | { |
c4b88406 | 4241 | int ret, retval = 0; |
b34cbebf | 4242 | struct lttng_ht_iter iter; |
b34cbebf | 4243 | struct ust_app_channel *ua_chan; |
c4b88406 | 4244 | struct consumer_socket *socket; |
b34cbebf | 4245 | |
c4b88406 | 4246 | DBG("Flushing app session buffers for ust app pid %d", app->pid); |
b34cbebf MD |
4247 | |
4248 | rcu_read_lock(); | |
4249 | ||
4250 | if (!app->compatible) { | |
c4b88406 | 4251 | goto end_not_compatible; |
b34cbebf MD |
4252 | } |
4253 | ||
4254 | pthread_mutex_lock(&ua_sess->lock); | |
4255 | ||
b161602a MD |
4256 | if (ua_sess->deleted) { |
4257 | goto end_deleted; | |
4258 | } | |
4259 | ||
b34cbebf MD |
4260 | health_code_update(); |
4261 | ||
9d6c7d3f | 4262 | /* Flushing buffers */ |
c4b88406 MD |
4263 | socket = consumer_find_socket_by_bitness(app->bits_per_long, |
4264 | ua_sess->consumer); | |
ce34fcd0 MD |
4265 | |
4266 | /* Flush buffers and push metadata. */ | |
4267 | switch (ua_sess->buffer_type) { | |
4268 | case LTTNG_BUFFER_PER_PID: | |
4269 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, | |
4270 | node.node) { | |
4271 | health_code_update(); | |
4272 | assert(ua_chan->is_sent); | |
4273 | ret = consumer_flush_channel(socket, ua_chan->key); | |
4274 | if (ret) { | |
4275 | ERR("Error flushing consumer channel"); | |
4276 | retval = -1; | |
4277 | continue; | |
4278 | } | |
8be98f9a | 4279 | } |
ce34fcd0 MD |
4280 | break; |
4281 | case LTTNG_BUFFER_PER_UID: | |
4282 | default: | |
4283 | assert(0); | |
4284 | break; | |
8be98f9a | 4285 | } |
8be98f9a | 4286 | |
840cb59c | 4287 | health_code_update(); |
86acf0da | 4288 | |
b161602a | 4289 | end_deleted: |
d88aee68 | 4290 | pthread_mutex_unlock(&ua_sess->lock); |
ce34fcd0 | 4291 | |
c4b88406 MD |
4292 | end_not_compatible: |
4293 | rcu_read_unlock(); | |
4294 | health_code_update(); | |
4295 | return retval; | |
4296 | } | |
4297 | ||
4298 | /* | |
ce34fcd0 MD |
4299 | * Flush buffers for all applications for a specific UST session. |
4300 | * Called with UST session lock held. | |
c4b88406 MD |
4301 | */ |
4302 | static | |
ce34fcd0 | 4303 | int ust_app_flush_session(struct ltt_ust_session *usess) |
c4b88406 MD |
4304 | |
4305 | { | |
99b1411c | 4306 | int ret = 0; |
c4b88406 | 4307 | |
ce34fcd0 | 4308 | DBG("Flushing session buffers for all ust apps"); |
c4b88406 MD |
4309 | |
4310 | rcu_read_lock(); | |
4311 | ||
ce34fcd0 MD |
4312 | /* Flush buffers and push metadata. */ |
4313 | switch (usess->buffer_type) { | |
4314 | case LTTNG_BUFFER_PER_UID: | |
4315 | { | |
4316 | struct buffer_reg_uid *reg; | |
4317 | struct lttng_ht_iter iter; | |
4318 | ||
4319 | /* Flush all per UID buffers associated to that session. */ | |
4320 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
4321 | struct ust_registry_session *ust_session_reg; | |
4322 | struct buffer_reg_channel *reg_chan; | |
4323 | struct consumer_socket *socket; | |
4324 | ||
4325 | /* Get consumer socket to use to push the metadata.*/ | |
4326 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
4327 | usess->consumer); | |
4328 | if (!socket) { | |
4329 | /* Ignore request if no consumer is found for the session. */ | |
4330 | continue; | |
4331 | } | |
4332 | ||
4333 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
4334 | reg_chan, node.node) { | |
4335 | /* | |
4336 | * The following call will print error values so the return | |
4337 | * code is of little importance because whatever happens, we | |
4338 | * have to try them all. | |
4339 | */ | |
4340 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
4341 | } | |
4342 | ||
4343 | ust_session_reg = reg->registry->reg.ust; | |
4344 | /* Push metadata. */ | |
4345 | (void) push_metadata(ust_session_reg, usess->consumer); | |
4346 | } | |
ce34fcd0 MD |
4347 | break; |
4348 | } | |
4349 | case LTTNG_BUFFER_PER_PID: | |
4350 | { | |
4351 | struct ust_app_session *ua_sess; | |
4352 | struct lttng_ht_iter iter; | |
4353 | struct ust_app *app; | |
4354 | ||
4355 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4356 | ua_sess = lookup_session_by_app(usess, app); | |
4357 | if (ua_sess == NULL) { | |
4358 | continue; | |
4359 | } | |
4360 | (void) ust_app_flush_app_session(app, ua_sess); | |
4361 | } | |
4362 | break; | |
4363 | } | |
4364 | default: | |
99b1411c | 4365 | ret = -1; |
ce34fcd0 MD |
4366 | assert(0); |
4367 | break; | |
c4b88406 | 4368 | } |
c4b88406 | 4369 | |
7db205b5 | 4370 | rcu_read_unlock(); |
840cb59c | 4371 | health_code_update(); |
c4b88406 | 4372 | return ret; |
8be98f9a MD |
4373 | } |
4374 | ||
84cd17c6 MD |
4375 | /* |
4376 | * Destroy a specific UST session in apps. | |
4377 | */ | |
3353de95 | 4378 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 4379 | { |
ffe60014 | 4380 | int ret; |
84cd17c6 | 4381 | struct ust_app_session *ua_sess; |
bec39940 | 4382 | struct lttng_ht_iter iter; |
d9bf3ca4 | 4383 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 4384 | |
852d0037 | 4385 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
4386 | |
4387 | rcu_read_lock(); | |
4388 | ||
e0c7ec2b DG |
4389 | if (!app->compatible) { |
4390 | goto end; | |
4391 | } | |
4392 | ||
84cd17c6 | 4393 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 4394 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 4395 | if (node == NULL) { |
d42f20df DG |
4396 | /* Session is being or is deleted. */ |
4397 | goto end; | |
84cd17c6 MD |
4398 | } |
4399 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 4400 | |
840cb59c | 4401 | health_code_update(); |
d0b96690 | 4402 | destroy_app_session(app, ua_sess); |
84cd17c6 | 4403 | |
840cb59c | 4404 | health_code_update(); |
7db205b5 | 4405 | |
84cd17c6 | 4406 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
4407 | ret = ustctl_wait_quiescent(app->sock); |
4408 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4409 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4410 | app->pid, ret); | |
4411 | } | |
e0c7ec2b DG |
4412 | end: |
4413 | rcu_read_unlock(); | |
840cb59c | 4414 | health_code_update(); |
84cd17c6 | 4415 | return 0; |
84cd17c6 MD |
4416 | } |
4417 | ||
5b4a0ec0 DG |
4418 | /* |
4419 | * Start tracing for the UST session. | |
4420 | */ | |
421cb601 DG |
4421 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
4422 | { | |
4423 | int ret = 0; | |
bec39940 | 4424 | struct lttng_ht_iter iter; |
421cb601 | 4425 | struct ust_app *app; |
48842b30 | 4426 | |
421cb601 DG |
4427 | DBG("Starting all UST traces"); |
4428 | ||
4429 | rcu_read_lock(); | |
421cb601 | 4430 | |
852d0037 | 4431 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
421cb601 | 4432 | ret = ust_app_start_trace(usess, app); |
48842b30 | 4433 | if (ret < 0) { |
5b4a0ec0 DG |
4434 | /* Continue to next apps even on error */ |
4435 | continue; | |
48842b30 | 4436 | } |
48842b30 | 4437 | } |
5b4a0ec0 | 4438 | |
48842b30 DG |
4439 | rcu_read_unlock(); |
4440 | ||
4441 | return 0; | |
4442 | } | |
487cf67c | 4443 | |
8be98f9a MD |
4444 | /* |
4445 | * Start tracing for the UST session. | |
ce34fcd0 | 4446 | * Called with UST session lock held. |
8be98f9a MD |
4447 | */ |
4448 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
4449 | { | |
4450 | int ret = 0; | |
bec39940 | 4451 | struct lttng_ht_iter iter; |
8be98f9a MD |
4452 | struct ust_app *app; |
4453 | ||
4454 | DBG("Stopping all UST traces"); | |
4455 | ||
4456 | rcu_read_lock(); | |
4457 | ||
b34cbebf MD |
4458 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4459 | ret = ust_app_stop_trace(usess, app); | |
4460 | if (ret < 0) { | |
4461 | /* Continue to next apps even on error */ | |
4462 | continue; | |
4463 | } | |
4464 | } | |
4465 | ||
ce34fcd0 | 4466 | (void) ust_app_flush_session(usess); |
8be98f9a MD |
4467 | |
4468 | rcu_read_unlock(); | |
4469 | ||
4470 | return 0; | |
4471 | } | |
4472 | ||
84cd17c6 MD |
4473 | /* |
4474 | * Destroy app UST session. | |
4475 | */ | |
4476 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
4477 | { | |
4478 | int ret = 0; | |
bec39940 | 4479 | struct lttng_ht_iter iter; |
84cd17c6 MD |
4480 | struct ust_app *app; |
4481 | ||
4482 | DBG("Destroy all UST traces"); | |
4483 | ||
4484 | rcu_read_lock(); | |
4485 | ||
852d0037 | 4486 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 4487 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
4488 | if (ret < 0) { |
4489 | /* Continue to next apps even on error */ | |
4490 | continue; | |
4491 | } | |
4492 | } | |
4493 | ||
4494 | rcu_read_unlock(); | |
4495 | ||
4496 | return 0; | |
4497 | } | |
4498 | ||
a9ad0c8f MD |
4499 | static |
4500 | void ust_app_global_create(struct ltt_ust_session *usess, struct ust_app *app) | |
487cf67c | 4501 | { |
55c54cce | 4502 | int ret = 0; |
31746f93 | 4503 | struct lttng_ht_iter iter, uiter; |
3d8ca23b | 4504 | struct ust_app_session *ua_sess = NULL; |
487cf67c DG |
4505 | struct ust_app_channel *ua_chan; |
4506 | struct ust_app_event *ua_event; | |
727d5404 | 4507 | struct ust_app_ctx *ua_ctx; |
a9ad0c8f | 4508 | int is_created = 0; |
1f3580c7 | 4509 | |
a9ad0c8f | 4510 | ret = create_ust_app_session(usess, app, &ua_sess, &is_created); |
3d8ca23b DG |
4511 | if (ret < 0) { |
4512 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
4513 | goto error; |
4514 | } | |
a9ad0c8f MD |
4515 | if (!is_created) { |
4516 | /* App session already created. */ | |
4517 | goto end; | |
4518 | } | |
3d8ca23b | 4519 | assert(ua_sess); |
487cf67c | 4520 | |
d0b96690 DG |
4521 | pthread_mutex_lock(&ua_sess->lock); |
4522 | ||
b161602a MD |
4523 | if (ua_sess->deleted) { |
4524 | pthread_mutex_unlock(&ua_sess->lock); | |
4525 | goto end; | |
4526 | } | |
4527 | ||
284d8f55 | 4528 | /* |
d0b96690 | 4529 | * We can iterate safely here over all UST app session since the create ust |
284d8f55 DG |
4530 | * app session above made a shadow copy of the UST global domain from the |
4531 | * ltt ust session. | |
4532 | */ | |
bec39940 DG |
4533 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
4534 | node.node) { | |
ad7a9107 | 4535 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
a7169585 | 4536 | if (ret < 0 && ret != -ENOTCONN) { |
ad7a9107 | 4537 | /* |
a7169585 MD |
4538 | * Stop everything. On error, the application |
4539 | * failed, no more file descriptor are available | |
4540 | * or ENOMEM so stopping here is the only thing | |
4541 | * we can do for now. The only exception is | |
4542 | * -ENOTCONN, which indicates that the application | |
4543 | * has exit. | |
ad7a9107 DG |
4544 | */ |
4545 | goto error_unlock; | |
487cf67c DG |
4546 | } |
4547 | ||
31746f93 DG |
4548 | /* |
4549 | * Add context using the list so they are enabled in the same order the | |
4550 | * user added them. | |
4551 | */ | |
4552 | cds_list_for_each_entry(ua_ctx, &ua_chan->ctx_list, list) { | |
727d5404 DG |
4553 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); |
4554 | if (ret < 0) { | |
d0b96690 | 4555 | goto error_unlock; |
727d5404 DG |
4556 | } |
4557 | } | |
4558 | ||
4559 | ||
284d8f55 | 4560 | /* For each events */ |
bec39940 DG |
4561 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
4562 | node.node) { | |
284d8f55 DG |
4563 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
4564 | if (ret < 0) { | |
d0b96690 | 4565 | goto error_unlock; |
487cf67c | 4566 | } |
36dc12cc | 4567 | } |
487cf67c DG |
4568 | } |
4569 | ||
d0b96690 DG |
4570 | pthread_mutex_unlock(&ua_sess->lock); |
4571 | ||
14fb1ebe | 4572 | if (usess->active) { |
421cb601 | 4573 | ret = ust_app_start_trace(usess, app); |
36dc12cc | 4574 | if (ret < 0) { |
36dc12cc DG |
4575 | goto error; |
4576 | } | |
4577 | ||
852d0037 | 4578 | DBG2("UST trace started for app pid %d", app->pid); |
36dc12cc | 4579 | } |
a9ad0c8f | 4580 | end: |
ffe60014 | 4581 | /* Everything went well at this point. */ |
ffe60014 DG |
4582 | return; |
4583 | ||
d0b96690 DG |
4584 | error_unlock: |
4585 | pthread_mutex_unlock(&ua_sess->lock); | |
487cf67c | 4586 | error: |
ffe60014 | 4587 | if (ua_sess) { |
d0b96690 | 4588 | destroy_app_session(app, ua_sess); |
ffe60014 | 4589 | } |
487cf67c DG |
4590 | return; |
4591 | } | |
55cc08a6 | 4592 | |
a9ad0c8f MD |
4593 | static |
4594 | void ust_app_global_destroy(struct ltt_ust_session *usess, struct ust_app *app) | |
4595 | { | |
4596 | struct ust_app_session *ua_sess; | |
4597 | ||
4598 | ua_sess = lookup_session_by_app(usess, app); | |
4599 | if (ua_sess == NULL) { | |
4600 | return; | |
4601 | } | |
4602 | destroy_app_session(app, ua_sess); | |
4603 | } | |
4604 | ||
4605 | /* | |
4606 | * Add channels/events from UST global domain to registered apps at sock. | |
4607 | * | |
4608 | * Called with session lock held. | |
4609 | * Called with RCU read-side lock held. | |
4610 | */ | |
4611 | void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app) | |
4612 | { | |
4613 | assert(usess); | |
4614 | ||
4615 | DBG2("UST app global update for app sock %d for session id %" PRIu64, | |
4616 | app->sock, usess->id); | |
4617 | ||
4618 | if (!app->compatible) { | |
4619 | return; | |
4620 | } | |
4621 | ||
4622 | if (trace_ust_pid_tracker_lookup(usess, app->pid)) { | |
4623 | ust_app_global_create(usess, app); | |
4624 | } else { | |
4625 | ust_app_global_destroy(usess, app); | |
4626 | } | |
4627 | } | |
4628 | ||
4629 | /* | |
4630 | * Called with session lock held. | |
4631 | */ | |
4632 | void ust_app_global_update_all(struct ltt_ust_session *usess) | |
4633 | { | |
4634 | struct lttng_ht_iter iter; | |
4635 | struct ust_app *app; | |
4636 | ||
4637 | rcu_read_lock(); | |
4638 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4639 | ust_app_global_update(usess, app); | |
4640 | } | |
4641 | rcu_read_unlock(); | |
4642 | } | |
4643 | ||
55cc08a6 DG |
4644 | /* |
4645 | * Add context to a specific channel for global UST domain. | |
4646 | */ | |
4647 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
4648 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
4649 | { | |
4650 | int ret = 0; | |
bec39940 DG |
4651 | struct lttng_ht_node_str *ua_chan_node; |
4652 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
4653 | struct ust_app_channel *ua_chan = NULL; |
4654 | struct ust_app_session *ua_sess; | |
4655 | struct ust_app *app; | |
4656 | ||
4657 | rcu_read_lock(); | |
4658 | ||
852d0037 | 4659 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4660 | if (!app->compatible) { |
4661 | /* | |
4662 | * TODO: In time, we should notice the caller of this error by | |
4663 | * telling him that this is a version error. | |
4664 | */ | |
4665 | continue; | |
4666 | } | |
55cc08a6 DG |
4667 | ua_sess = lookup_session_by_app(usess, app); |
4668 | if (ua_sess == NULL) { | |
4669 | continue; | |
4670 | } | |
4671 | ||
d0b96690 | 4672 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
4673 | |
4674 | if (ua_sess->deleted) { | |
4675 | pthread_mutex_unlock(&ua_sess->lock); | |
4676 | continue; | |
4677 | } | |
4678 | ||
55cc08a6 | 4679 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4680 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4681 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 4682 | if (ua_chan_node == NULL) { |
d0b96690 | 4683 | goto next_app; |
55cc08a6 DG |
4684 | } |
4685 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
4686 | node); | |
55cc08a6 DG |
4687 | ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app); |
4688 | if (ret < 0) { | |
d0b96690 | 4689 | goto next_app; |
55cc08a6 | 4690 | } |
d0b96690 DG |
4691 | next_app: |
4692 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
4693 | } |
4694 | ||
55cc08a6 DG |
4695 | rcu_read_unlock(); |
4696 | return ret; | |
4697 | } | |
4698 | ||
76d45b40 DG |
4699 | /* |
4700 | * Enable event for a channel from a UST session for a specific PID. | |
4701 | */ | |
4702 | int ust_app_enable_event_pid(struct ltt_ust_session *usess, | |
4703 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4704 | { | |
4705 | int ret = 0; | |
bec39940 | 4706 | struct lttng_ht_iter iter; |
18eace3b | 4707 | struct lttng_ht_node_str *ua_chan_node; |
76d45b40 DG |
4708 | struct ust_app *app; |
4709 | struct ust_app_session *ua_sess; | |
4710 | struct ust_app_channel *ua_chan; | |
4711 | struct ust_app_event *ua_event; | |
4712 | ||
4713 | DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid); | |
4714 | ||
4715 | rcu_read_lock(); | |
4716 | ||
4717 | app = ust_app_find_by_pid(pid); | |
4718 | if (app == NULL) { | |
4719 | ERR("UST app enable event per PID %d not found", pid); | |
4720 | ret = -1; | |
d0b96690 | 4721 | goto end; |
76d45b40 DG |
4722 | } |
4723 | ||
e0c7ec2b DG |
4724 | if (!app->compatible) { |
4725 | ret = 0; | |
d0b96690 | 4726 | goto end; |
e0c7ec2b DG |
4727 | } |
4728 | ||
76d45b40 | 4729 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4730 | if (!ua_sess) { |
4731 | /* The application has problem or is probably dead. */ | |
d0b96690 DG |
4732 | ret = 0; |
4733 | goto end; | |
c4a1715b | 4734 | } |
76d45b40 | 4735 | |
d0b96690 | 4736 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
4737 | |
4738 | if (ua_sess->deleted) { | |
4739 | ret = 0; | |
4740 | goto end_unlock; | |
4741 | } | |
4742 | ||
76d45b40 | 4743 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4744 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4745 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
76d45b40 DG |
4746 | /* If the channel is not found, there is a code flow error */ |
4747 | assert(ua_chan_node); | |
4748 | ||
4749 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4750 | ||
18eace3b | 4751 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 4752 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 4753 | if (ua_event == NULL) { |
76d45b40 DG |
4754 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
4755 | if (ret < 0) { | |
d0b96690 | 4756 | goto end_unlock; |
76d45b40 DG |
4757 | } |
4758 | } else { | |
76d45b40 DG |
4759 | ret = enable_ust_app_event(ua_sess, ua_event, app); |
4760 | if (ret < 0) { | |
d0b96690 | 4761 | goto end_unlock; |
76d45b40 DG |
4762 | } |
4763 | } | |
4764 | ||
d0b96690 DG |
4765 | end_unlock: |
4766 | pthread_mutex_unlock(&ua_sess->lock); | |
4767 | end: | |
76d45b40 DG |
4768 | rcu_read_unlock(); |
4769 | return ret; | |
4770 | } | |
7f79d3a1 | 4771 | |
4466912f DG |
4772 | /* |
4773 | * Calibrate registered applications. | |
4774 | */ | |
4775 | int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate) | |
4776 | { | |
4777 | int ret = 0; | |
4778 | struct lttng_ht_iter iter; | |
4779 | struct ust_app *app; | |
4780 | ||
4781 | rcu_read_lock(); | |
4782 | ||
852d0037 | 4783 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4466912f DG |
4784 | if (!app->compatible) { |
4785 | /* | |
4786 | * TODO: In time, we should notice the caller of this error by | |
4787 | * telling him that this is a version error. | |
4788 | */ | |
4789 | continue; | |
4790 | } | |
4791 | ||
840cb59c | 4792 | health_code_update(); |
86acf0da | 4793 | |
852d0037 | 4794 | ret = ustctl_calibrate(app->sock, calibrate); |
4466912f DG |
4795 | if (ret < 0) { |
4796 | switch (ret) { | |
4797 | case -ENOSYS: | |
4798 | /* Means that it's not implemented on the tracer side. */ | |
4799 | ret = 0; | |
4800 | break; | |
4801 | default: | |
4466912f | 4802 | DBG2("Calibrate app PID %d returned with error %d", |
852d0037 | 4803 | app->pid, ret); |
4466912f DG |
4804 | break; |
4805 | } | |
4806 | } | |
4807 | } | |
4808 | ||
4809 | DBG("UST app global domain calibration finished"); | |
4810 | ||
4811 | rcu_read_unlock(); | |
4812 | ||
840cb59c | 4813 | health_code_update(); |
86acf0da | 4814 | |
4466912f DG |
4815 | return ret; |
4816 | } | |
d0b96690 DG |
4817 | |
4818 | /* | |
4819 | * Receive registration and populate the given msg structure. | |
4820 | * | |
4821 | * On success return 0 else a negative value returned by the ustctl call. | |
4822 | */ | |
4823 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
4824 | { | |
4825 | int ret; | |
4826 | uint32_t pid, ppid, uid, gid; | |
4827 | ||
4828 | assert(msg); | |
4829 | ||
4830 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
4831 | &pid, &ppid, &uid, &gid, | |
4832 | &msg->bits_per_long, | |
4833 | &msg->uint8_t_alignment, | |
4834 | &msg->uint16_t_alignment, | |
4835 | &msg->uint32_t_alignment, | |
4836 | &msg->uint64_t_alignment, | |
4837 | &msg->long_alignment, | |
4838 | &msg->byte_order, | |
4839 | msg->name); | |
4840 | if (ret < 0) { | |
4841 | switch (-ret) { | |
4842 | case EPIPE: | |
4843 | case ECONNRESET: | |
4844 | case LTTNG_UST_ERR_EXITING: | |
4845 | DBG3("UST app recv reg message failed. Application died"); | |
4846 | break; | |
4847 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
4848 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
4849 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
4850 | LTTNG_UST_ABI_MINOR_VERSION); | |
4851 | break; | |
4852 | default: | |
4853 | ERR("UST app recv reg message failed with ret %d", ret); | |
4854 | break; | |
4855 | } | |
4856 | goto error; | |
4857 | } | |
4858 | msg->pid = (pid_t) pid; | |
4859 | msg->ppid = (pid_t) ppid; | |
4860 | msg->uid = (uid_t) uid; | |
4861 | msg->gid = (gid_t) gid; | |
4862 | ||
4863 | error: | |
4864 | return ret; | |
4865 | } | |
4866 | ||
d88aee68 DG |
4867 | /* |
4868 | * Return a ust app channel object using the application object and the channel | |
4869 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
4870 | * lock MUST be acquired before calling this function. | |
4871 | */ | |
d0b96690 DG |
4872 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
4873 | int objd) | |
4874 | { | |
4875 | struct lttng_ht_node_ulong *node; | |
4876 | struct lttng_ht_iter iter; | |
4877 | struct ust_app_channel *ua_chan = NULL; | |
4878 | ||
4879 | assert(app); | |
4880 | ||
4881 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
4882 | node = lttng_ht_iter_get_node_ulong(&iter); | |
4883 | if (node == NULL) { | |
4884 | DBG2("UST app channel find by objd %d not found", objd); | |
4885 | goto error; | |
4886 | } | |
4887 | ||
4888 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
4889 | ||
4890 | error: | |
4891 | return ua_chan; | |
4892 | } | |
4893 | ||
d88aee68 DG |
4894 | /* |
4895 | * Reply to a register channel notification from an application on the notify | |
4896 | * socket. The channel metadata is also created. | |
4897 | * | |
4898 | * The session UST registry lock is acquired in this function. | |
4899 | * | |
4900 | * On success 0 is returned else a negative value. | |
4901 | */ | |
d0b96690 DG |
4902 | static int reply_ust_register_channel(int sock, int sobjd, int cobjd, |
4903 | size_t nr_fields, struct ustctl_field *fields) | |
4904 | { | |
4905 | int ret, ret_code = 0; | |
4906 | uint32_t chan_id, reg_count; | |
7972aab2 | 4907 | uint64_t chan_reg_key; |
d0b96690 DG |
4908 | enum ustctl_channel_header type; |
4909 | struct ust_app *app; | |
4910 | struct ust_app_channel *ua_chan; | |
4911 | struct ust_app_session *ua_sess; | |
7972aab2 | 4912 | struct ust_registry_session *registry; |
45893984 | 4913 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
4914 | |
4915 | rcu_read_lock(); | |
4916 | ||
4917 | /* Lookup application. If not found, there is a code flow error. */ | |
4918 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4919 | if (!app) { |
4920 | DBG("Application socket %d is being teardown. Abort event notify", | |
4921 | sock); | |
4922 | ret = 0; | |
d5d629b5 | 4923 | free(fields); |
d88aee68 DG |
4924 | goto error_rcu_unlock; |
4925 | } | |
d0b96690 | 4926 | |
4950b860 | 4927 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4928 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4929 | if (!ua_chan) { |
4930 | DBG("Application channel is being teardown. Abort event notify"); | |
4931 | ret = 0; | |
d5d629b5 | 4932 | free(fields); |
4950b860 MD |
4933 | goto error_rcu_unlock; |
4934 | } | |
4935 | ||
d0b96690 DG |
4936 | assert(ua_chan->session); |
4937 | ua_sess = ua_chan->session; | |
d0b96690 | 4938 | |
7972aab2 DG |
4939 | /* Get right session registry depending on the session buffer type. */ |
4940 | registry = get_session_registry(ua_sess); | |
4941 | assert(registry); | |
45893984 | 4942 | |
7972aab2 DG |
4943 | /* Depending on the buffer type, a different channel key is used. */ |
4944 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4945 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 4946 | } else { |
7972aab2 | 4947 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
4948 | } |
4949 | ||
7972aab2 DG |
4950 | pthread_mutex_lock(®istry->lock); |
4951 | ||
4952 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
4953 | assert(chan_reg); | |
4954 | ||
4955 | if (!chan_reg->register_done) { | |
4956 | reg_count = ust_registry_get_event_count(chan_reg); | |
4957 | if (reg_count < 31) { | |
4958 | type = USTCTL_CHANNEL_HEADER_COMPACT; | |
4959 | } else { | |
4960 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
4961 | } | |
4962 | ||
4963 | chan_reg->nr_ctx_fields = nr_fields; | |
4964 | chan_reg->ctx_fields = fields; | |
4965 | chan_reg->header_type = type; | |
d0b96690 | 4966 | } else { |
7972aab2 DG |
4967 | /* Get current already assigned values. */ |
4968 | type = chan_reg->header_type; | |
d5d629b5 DG |
4969 | free(fields); |
4970 | /* Set to NULL so the error path does not do a double free. */ | |
4971 | fields = NULL; | |
d0b96690 | 4972 | } |
7972aab2 DG |
4973 | /* Channel id is set during the object creation. */ |
4974 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
4975 | |
4976 | /* Append to metadata */ | |
7972aab2 DG |
4977 | if (!chan_reg->metadata_dumped) { |
4978 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
4979 | if (ret_code) { |
4980 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
4981 | goto reply; | |
4982 | } | |
4983 | } | |
4984 | ||
4985 | reply: | |
7972aab2 DG |
4986 | DBG3("UST app replying to register channel key %" PRIu64 |
4987 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
4988 | ret_code); | |
d0b96690 DG |
4989 | |
4990 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
4991 | if (ret < 0) { | |
4992 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4993 | ERR("UST app reply channel failed with ret %d", ret); | |
4994 | } else { | |
4995 | DBG3("UST app reply channel failed. Application died"); | |
4996 | } | |
4997 | goto error; | |
4998 | } | |
4999 | ||
7972aab2 DG |
5000 | /* This channel registry registration is completed. */ |
5001 | chan_reg->register_done = 1; | |
5002 | ||
d0b96690 | 5003 | error: |
7972aab2 | 5004 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 5005 | error_rcu_unlock: |
d0b96690 | 5006 | rcu_read_unlock(); |
d5d629b5 DG |
5007 | if (ret) { |
5008 | free(fields); | |
5009 | } | |
d0b96690 DG |
5010 | return ret; |
5011 | } | |
5012 | ||
d88aee68 DG |
5013 | /* |
5014 | * Add event to the UST channel registry. When the event is added to the | |
5015 | * registry, the metadata is also created. Once done, this replies to the | |
5016 | * application with the appropriate error code. | |
5017 | * | |
5018 | * The session UST registry lock is acquired in the function. | |
5019 | * | |
5020 | * On success 0 is returned else a negative value. | |
5021 | */ | |
d0b96690 DG |
5022 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
5023 | char *sig, size_t nr_fields, struct ustctl_field *fields, int loglevel, | |
5024 | char *model_emf_uri) | |
5025 | { | |
5026 | int ret, ret_code; | |
5027 | uint32_t event_id = 0; | |
7972aab2 | 5028 | uint64_t chan_reg_key; |
d0b96690 DG |
5029 | struct ust_app *app; |
5030 | struct ust_app_channel *ua_chan; | |
5031 | struct ust_app_session *ua_sess; | |
7972aab2 | 5032 | struct ust_registry_session *registry; |
d0b96690 DG |
5033 | |
5034 | rcu_read_lock(); | |
5035 | ||
5036 | /* Lookup application. If not found, there is a code flow error. */ | |
5037 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
5038 | if (!app) { |
5039 | DBG("Application socket %d is being teardown. Abort event notify", | |
5040 | sock); | |
5041 | ret = 0; | |
d5d629b5 DG |
5042 | free(sig); |
5043 | free(fields); | |
5044 | free(model_emf_uri); | |
d88aee68 DG |
5045 | goto error_rcu_unlock; |
5046 | } | |
d0b96690 | 5047 | |
4950b860 | 5048 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 5049 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
5050 | if (!ua_chan) { |
5051 | DBG("Application channel is being teardown. Abort event notify"); | |
5052 | ret = 0; | |
d5d629b5 DG |
5053 | free(sig); |
5054 | free(fields); | |
5055 | free(model_emf_uri); | |
4950b860 MD |
5056 | goto error_rcu_unlock; |
5057 | } | |
5058 | ||
d0b96690 DG |
5059 | assert(ua_chan->session); |
5060 | ua_sess = ua_chan->session; | |
5061 | ||
7972aab2 DG |
5062 | registry = get_session_registry(ua_sess); |
5063 | assert(registry); | |
5064 | ||
5065 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
5066 | chan_reg_key = ua_chan->tracing_channel_id; | |
5067 | } else { | |
5068 | chan_reg_key = ua_chan->key; | |
5069 | } | |
5070 | ||
5071 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 5072 | |
d5d629b5 DG |
5073 | /* |
5074 | * From this point on, this call acquires the ownership of the sig, fields | |
5075 | * and model_emf_uri meaning any free are done inside it if needed. These | |
5076 | * three variables MUST NOT be read/write after this. | |
5077 | */ | |
7972aab2 | 5078 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
45893984 | 5079 | sobjd, cobjd, name, sig, nr_fields, fields, loglevel, |
8494bda5 MD |
5080 | model_emf_uri, ua_sess->buffer_type, &event_id, |
5081 | app); | |
d0b96690 DG |
5082 | |
5083 | /* | |
5084 | * The return value is returned to ustctl so in case of an error, the | |
5085 | * application can be notified. In case of an error, it's important not to | |
5086 | * return a negative error or else the application will get closed. | |
5087 | */ | |
5088 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
5089 | if (ret < 0) { | |
5090 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5091 | ERR("UST app reply event failed with ret %d", ret); | |
5092 | } else { | |
5093 | DBG3("UST app reply event failed. Application died"); | |
5094 | } | |
5095 | /* | |
5096 | * No need to wipe the create event since the application socket will | |
5097 | * get close on error hence cleaning up everything by itself. | |
5098 | */ | |
5099 | goto error; | |
5100 | } | |
5101 | ||
7972aab2 DG |
5102 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
5103 | name, event_id); | |
d88aee68 | 5104 | |
d0b96690 | 5105 | error: |
7972aab2 | 5106 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 5107 | error_rcu_unlock: |
d0b96690 DG |
5108 | rcu_read_unlock(); |
5109 | return ret; | |
5110 | } | |
5111 | ||
d88aee68 DG |
5112 | /* |
5113 | * Handle application notification through the given notify socket. | |
5114 | * | |
5115 | * Return 0 on success or else a negative value. | |
5116 | */ | |
d0b96690 DG |
5117 | int ust_app_recv_notify(int sock) |
5118 | { | |
5119 | int ret; | |
5120 | enum ustctl_notify_cmd cmd; | |
5121 | ||
5122 | DBG3("UST app receiving notify from sock %d", sock); | |
5123 | ||
5124 | ret = ustctl_recv_notify(sock, &cmd); | |
5125 | if (ret < 0) { | |
5126 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5127 | ERR("UST app recv notify failed with ret %d", ret); | |
5128 | } else { | |
5129 | DBG3("UST app recv notify failed. Application died"); | |
5130 | } | |
5131 | goto error; | |
5132 | } | |
5133 | ||
5134 | switch (cmd) { | |
5135 | case USTCTL_NOTIFY_CMD_EVENT: | |
5136 | { | |
5137 | int sobjd, cobjd, loglevel; | |
5138 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; | |
5139 | size_t nr_fields; | |
5140 | struct ustctl_field *fields; | |
5141 | ||
5142 | DBG2("UST app ustctl register event received"); | |
5143 | ||
5144 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, &loglevel, | |
5145 | &sig, &nr_fields, &fields, &model_emf_uri); | |
5146 | if (ret < 0) { | |
5147 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5148 | ERR("UST app recv event failed with ret %d", ret); | |
5149 | } else { | |
5150 | DBG3("UST app recv event failed. Application died"); | |
5151 | } | |
5152 | goto error; | |
5153 | } | |
5154 | ||
d5d629b5 DG |
5155 | /* |
5156 | * Add event to the UST registry coming from the notify socket. This | |
5157 | * call will free if needed the sig, fields and model_emf_uri. This | |
5158 | * code path loses the ownsership of these variables and transfer them | |
5159 | * to the this function. | |
5160 | */ | |
d0b96690 DG |
5161 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
5162 | fields, loglevel, model_emf_uri); | |
5163 | if (ret < 0) { | |
5164 | goto error; | |
5165 | } | |
5166 | ||
5167 | break; | |
5168 | } | |
5169 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
5170 | { | |
5171 | int sobjd, cobjd; | |
5172 | size_t nr_fields; | |
5173 | struct ustctl_field *fields; | |
5174 | ||
5175 | DBG2("UST app ustctl register channel received"); | |
5176 | ||
5177 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
5178 | &fields); | |
5179 | if (ret < 0) { | |
5180 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5181 | ERR("UST app recv channel failed with ret %d", ret); | |
5182 | } else { | |
5183 | DBG3("UST app recv channel failed. Application died"); | |
5184 | } | |
5185 | goto error; | |
5186 | } | |
5187 | ||
d5d629b5 DG |
5188 | /* |
5189 | * The fields ownership are transfered to this function call meaning | |
5190 | * that if needed it will be freed. After this, it's invalid to access | |
5191 | * fields or clean it up. | |
5192 | */ | |
d0b96690 DG |
5193 | ret = reply_ust_register_channel(sock, sobjd, cobjd, nr_fields, |
5194 | fields); | |
5195 | if (ret < 0) { | |
5196 | goto error; | |
5197 | } | |
5198 | ||
5199 | break; | |
5200 | } | |
5201 | default: | |
5202 | /* Should NEVER happen. */ | |
5203 | assert(0); | |
5204 | } | |
5205 | ||
5206 | error: | |
5207 | return ret; | |
5208 | } | |
d88aee68 DG |
5209 | |
5210 | /* | |
5211 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
5212 | * corresponding application. On failure, the call_rcu to close the socket is | |
5213 | * executed. If an application is found, it tries to delete it from the notify | |
5214 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
5215 | * | |
5216 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
5217 | * call RCU is not done but the rest of the cleanup is. | |
5218 | */ | |
5219 | void ust_app_notify_sock_unregister(int sock) | |
5220 | { | |
5221 | int err_enomem = 0; | |
5222 | struct lttng_ht_iter iter; | |
5223 | struct ust_app *app; | |
5224 | struct ust_app_notify_sock_obj *obj; | |
5225 | ||
5226 | assert(sock >= 0); | |
5227 | ||
5228 | rcu_read_lock(); | |
5229 | ||
5230 | obj = zmalloc(sizeof(*obj)); | |
5231 | if (!obj) { | |
5232 | /* | |
5233 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
5234 | * procedure but the call_rcu will not be called. In this case, we | |
5235 | * accept the fd leak rather than possibly creating an unsynchronized | |
5236 | * state between threads. | |
5237 | * | |
5238 | * TODO: The notify object should be created once the notify socket is | |
5239 | * registered and stored independantely from the ust app object. The | |
5240 | * tricky part is to synchronize the teardown of the application and | |
5241 | * this notify object. Let's keep that in mind so we can avoid this | |
5242 | * kind of shenanigans with ENOMEM in the teardown path. | |
5243 | */ | |
5244 | err_enomem = 1; | |
5245 | } else { | |
5246 | obj->fd = sock; | |
5247 | } | |
5248 | ||
5249 | DBG("UST app notify socket unregister %d", sock); | |
5250 | ||
5251 | /* | |
5252 | * Lookup application by notify socket. If this fails, this means that the | |
5253 | * hash table delete has already been done by the application | |
5254 | * unregistration process so we can safely close the notify socket in a | |
5255 | * call RCU. | |
5256 | */ | |
5257 | app = find_app_by_notify_sock(sock); | |
5258 | if (!app) { | |
5259 | goto close_socket; | |
5260 | } | |
5261 | ||
5262 | iter.iter.node = &app->notify_sock_n.node; | |
5263 | ||
5264 | /* | |
5265 | * Whatever happens here either we fail or succeed, in both cases we have | |
5266 | * to close the socket after a grace period to continue to the call RCU | |
5267 | * here. If the deletion is successful, the application is not visible | |
5268 | * anymore by other threads and is it fails it means that it was already | |
5269 | * deleted from the hash table so either way we just have to close the | |
5270 | * socket. | |
5271 | */ | |
5272 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
5273 | ||
5274 | close_socket: | |
5275 | rcu_read_unlock(); | |
5276 | ||
5277 | /* | |
5278 | * Close socket after a grace period to avoid for the socket to be reused | |
5279 | * before the application object is freed creating potential race between | |
5280 | * threads trying to add unique in the global hash table. | |
5281 | */ | |
5282 | if (!err_enomem) { | |
5283 | call_rcu(&obj->head, close_notify_sock_rcu); | |
5284 | } | |
5285 | } | |
f45e313d DG |
5286 | |
5287 | /* | |
5288 | * Destroy a ust app data structure and free its memory. | |
5289 | */ | |
5290 | void ust_app_destroy(struct ust_app *app) | |
5291 | { | |
5292 | if (!app) { | |
5293 | return; | |
5294 | } | |
5295 | ||
5296 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
5297 | } | |
6dc3064a DG |
5298 | |
5299 | /* | |
5300 | * Take a snapshot for a given UST session. The snapshot is sent to the given | |
5301 | * output. | |
5302 | * | |
5303 | * Return 0 on success or else a negative value. | |
5304 | */ | |
5305 | int ust_app_snapshot_record(struct ltt_ust_session *usess, | |
d07ceecd MD |
5306 | struct snapshot_output *output, int wait, |
5307 | uint64_t nb_packets_per_stream) | |
6dc3064a DG |
5308 | { |
5309 | int ret = 0; | |
7badf927 | 5310 | unsigned int snapshot_done = 0; |
6dc3064a DG |
5311 | struct lttng_ht_iter iter; |
5312 | struct ust_app *app; | |
af706bb7 | 5313 | char pathname[PATH_MAX]; |
6dc3064a DG |
5314 | |
5315 | assert(usess); | |
5316 | assert(output); | |
5317 | ||
5318 | rcu_read_lock(); | |
5319 | ||
8c924c7b MD |
5320 | switch (usess->buffer_type) { |
5321 | case LTTNG_BUFFER_PER_UID: | |
5322 | { | |
5323 | struct buffer_reg_uid *reg; | |
6dc3064a | 5324 | |
8c924c7b MD |
5325 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
5326 | struct buffer_reg_channel *reg_chan; | |
5327 | struct consumer_socket *socket; | |
6dc3064a | 5328 | |
8c924c7b MD |
5329 | /* Get consumer socket to use to push the metadata.*/ |
5330 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
5331 | usess->consumer); | |
5332 | if (!socket) { | |
5333 | ret = -EINVAL; | |
5334 | goto error; | |
5335 | } | |
6dc3064a | 5336 | |
8c924c7b MD |
5337 | memset(pathname, 0, sizeof(pathname)); |
5338 | ret = snprintf(pathname, sizeof(pathname), | |
5339 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH, | |
5340 | reg->uid, reg->bits_per_long); | |
5341 | if (ret < 0) { | |
5342 | PERROR("snprintf snapshot path"); | |
5343 | goto error; | |
5344 | } | |
5345 | ||
5346 | /* Add the UST default trace dir to path. */ | |
5347 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
5348 | reg_chan, node.node) { | |
68808f4e DG |
5349 | ret = consumer_snapshot_channel(socket, reg_chan->consumer_key, |
5350 | output, 0, usess->uid, usess->gid, pathname, wait, | |
d07ceecd | 5351 | nb_packets_per_stream); |
8c924c7b MD |
5352 | if (ret < 0) { |
5353 | goto error; | |
5354 | } | |
5355 | } | |
68808f4e DG |
5356 | ret = consumer_snapshot_channel(socket, |
5357 | reg->registry->reg.ust->metadata_key, output, 1, | |
d07ceecd | 5358 | usess->uid, usess->gid, pathname, wait, 0); |
8c924c7b MD |
5359 | if (ret < 0) { |
5360 | goto error; | |
5361 | } | |
7badf927 | 5362 | snapshot_done = 1; |
af706bb7 | 5363 | } |
8c924c7b MD |
5364 | break; |
5365 | } | |
5366 | case LTTNG_BUFFER_PER_PID: | |
5367 | { | |
5368 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5369 | struct consumer_socket *socket; | |
5370 | struct lttng_ht_iter chan_iter; | |
5371 | struct ust_app_channel *ua_chan; | |
5372 | struct ust_app_session *ua_sess; | |
5373 | struct ust_registry_session *registry; | |
5374 | ||
5375 | ua_sess = lookup_session_by_app(usess, app); | |
5376 | if (!ua_sess) { | |
5377 | /* Session not associated with this app. */ | |
5378 | continue; | |
5379 | } | |
af706bb7 | 5380 | |
8c924c7b MD |
5381 | /* Get the right consumer socket for the application. */ |
5382 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
5383 | output->consumer); | |
5384 | if (!socket) { | |
5c786ded | 5385 | ret = -EINVAL; |
5c786ded JD |
5386 | goto error; |
5387 | } | |
5388 | ||
8c924c7b MD |
5389 | /* Add the UST default trace dir to path. */ |
5390 | memset(pathname, 0, sizeof(pathname)); | |
5391 | ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "/%s", | |
5392 | ua_sess->path); | |
6dc3064a | 5393 | if (ret < 0) { |
8c924c7b | 5394 | PERROR("snprintf snapshot path"); |
6dc3064a DG |
5395 | goto error; |
5396 | } | |
6dc3064a | 5397 | |
8c924c7b MD |
5398 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, |
5399 | ua_chan, node.node) { | |
68808f4e DG |
5400 | ret = consumer_snapshot_channel(socket, ua_chan->key, output, |
5401 | 0, ua_sess->euid, ua_sess->egid, pathname, wait, | |
d07ceecd | 5402 | nb_packets_per_stream); |
8c924c7b MD |
5403 | if (ret < 0) { |
5404 | goto error; | |
5405 | } | |
5406 | } | |
5407 | ||
5408 | registry = get_session_registry(ua_sess); | |
5409 | assert(registry); | |
5410 | ret = consumer_snapshot_channel(socket, registry->metadata_key, output, | |
d07ceecd | 5411 | 1, ua_sess->euid, ua_sess->egid, pathname, wait, 0); |
8c924c7b MD |
5412 | if (ret < 0) { |
5413 | goto error; | |
5414 | } | |
7badf927 | 5415 | snapshot_done = 1; |
8c924c7b MD |
5416 | } |
5417 | break; | |
5418 | } | |
5419 | default: | |
5420 | assert(0); | |
5421 | break; | |
6dc3064a DG |
5422 | } |
5423 | ||
7badf927 DG |
5424 | if (!snapshot_done) { |
5425 | /* | |
5426 | * If no snapshot was made and we are not in the error path, this means | |
5427 | * that there are no buffers thus no (prior) application to snapshot | |
5428 | * data from so we have simply NO data. | |
5429 | */ | |
5430 | ret = -ENODATA; | |
5431 | } | |
5432 | ||
6dc3064a DG |
5433 | error: |
5434 | rcu_read_unlock(); | |
5435 | return ret; | |
5436 | } | |
5c786ded JD |
5437 | |
5438 | /* | |
d07ceecd | 5439 | * Return the size taken by one more packet per stream. |
5c786ded | 5440 | */ |
d07ceecd MD |
5441 | uint64_t ust_app_get_size_one_more_packet_per_stream(struct ltt_ust_session *usess, |
5442 | uint64_t cur_nr_packets) | |
5c786ded | 5443 | { |
d07ceecd | 5444 | uint64_t tot_size = 0; |
5c786ded JD |
5445 | struct ust_app *app; |
5446 | struct lttng_ht_iter iter; | |
5447 | ||
5448 | assert(usess); | |
5449 | ||
5450 | switch (usess->buffer_type) { | |
5451 | case LTTNG_BUFFER_PER_UID: | |
5452 | { | |
5453 | struct buffer_reg_uid *reg; | |
5454 | ||
5455 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
5456 | struct buffer_reg_channel *reg_chan; | |
5457 | ||
b7064eaa | 5458 | rcu_read_lock(); |
5c786ded JD |
5459 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
5460 | reg_chan, node.node) { | |
d07ceecd MD |
5461 | if (cur_nr_packets >= reg_chan->num_subbuf) { |
5462 | /* | |
5463 | * Don't take channel into account if we | |
5464 | * already grab all its packets. | |
5465 | */ | |
5466 | continue; | |
5467 | } | |
5468 | tot_size += reg_chan->subbuf_size * reg_chan->stream_count; | |
5c786ded | 5469 | } |
b7064eaa | 5470 | rcu_read_unlock(); |
5c786ded JD |
5471 | } |
5472 | break; | |
5473 | } | |
5474 | case LTTNG_BUFFER_PER_PID: | |
5475 | { | |
5476 | rcu_read_lock(); | |
5477 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5478 | struct ust_app_channel *ua_chan; | |
5479 | struct ust_app_session *ua_sess; | |
5480 | struct lttng_ht_iter chan_iter; | |
5481 | ||
5482 | ua_sess = lookup_session_by_app(usess, app); | |
5483 | if (!ua_sess) { | |
5484 | /* Session not associated with this app. */ | |
5485 | continue; | |
5486 | } | |
5487 | ||
5488 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
5489 | ua_chan, node.node) { | |
d07ceecd MD |
5490 | if (cur_nr_packets >= ua_chan->attr.num_subbuf) { |
5491 | /* | |
5492 | * Don't take channel into account if we | |
5493 | * already grab all its packets. | |
5494 | */ | |
5495 | continue; | |
5496 | } | |
5497 | tot_size += ua_chan->attr.subbuf_size * ua_chan->streams.count; | |
5c786ded JD |
5498 | } |
5499 | } | |
5500 | rcu_read_unlock(); | |
5501 | break; | |
5502 | } | |
5503 | default: | |
5504 | assert(0); | |
5505 | break; | |
5506 | } | |
5507 | ||
d07ceecd | 5508 | return tot_size; |
5c786ded | 5509 | } |