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. | |
434 | */ | |
435 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
436 | struct consumer_socket *socket, int send_zero_data) | |
437 | { | |
438 | int ret; | |
439 | char *metadata_str = NULL; | |
440 | size_t len, offset; | |
441 | ssize_t ret_val; | |
442 | ||
443 | assert(registry); | |
444 | assert(socket); | |
1b532a60 | 445 | |
ce34fcd0 | 446 | /* |
dc2bbdae MD |
447 | * Means that no metadata was assigned to the session. This can |
448 | * happens if no start has been done previously. | |
ce34fcd0 MD |
449 | */ |
450 | if (!registry->metadata_key) { | |
ce34fcd0 MD |
451 | return 0; |
452 | } | |
453 | ||
1b532a60 | 454 | /* |
dc2bbdae MD |
455 | * On a push metadata error either the consumer is dead or the |
456 | * metadata channel has been destroyed because its endpoint | |
457 | * might have died (e.g: relayd). If so, the metadata closed | |
458 | * flag is set to 1 so we deny pushing metadata again which is | |
459 | * not valid anymore on the consumer side. | |
1b532a60 DG |
460 | */ |
461 | if (registry->metadata_closed) { | |
462 | return -EPIPE; | |
463 | } | |
331744e3 | 464 | |
331744e3 JD |
465 | offset = registry->metadata_len_sent; |
466 | len = registry->metadata_len - registry->metadata_len_sent; | |
467 | if (len == 0) { | |
468 | DBG3("No metadata to push for metadata key %" PRIu64, | |
469 | registry->metadata_key); | |
470 | ret_val = len; | |
471 | if (send_zero_data) { | |
472 | DBG("No metadata to push"); | |
473 | goto push_data; | |
474 | } | |
475 | goto end; | |
476 | } | |
477 | ||
478 | /* Allocate only what we have to send. */ | |
479 | metadata_str = zmalloc(len); | |
480 | if (!metadata_str) { | |
481 | PERROR("zmalloc ust app metadata string"); | |
482 | ret_val = -ENOMEM; | |
483 | goto error; | |
484 | } | |
485 | /* Copy what we haven't send out. */ | |
486 | memcpy(metadata_str, registry->metadata + offset, len); | |
487 | registry->metadata_len_sent += len; | |
488 | ||
489 | push_data: | |
331744e3 JD |
490 | ret = consumer_push_metadata(socket, registry->metadata_key, |
491 | metadata_str, len, offset); | |
492 | if (ret < 0) { | |
000baf6a | 493 | /* |
dc2bbdae MD |
494 | * There is an acceptable race here between the registry |
495 | * metadata key assignment and the creation on the | |
496 | * consumer. The session daemon can concurrently push | |
497 | * metadata for this registry while being created on the | |
498 | * consumer since the metadata key of the registry is | |
499 | * assigned *before* it is setup to avoid the consumer | |
500 | * to ask for metadata that could possibly be not found | |
501 | * in the session daemon. | |
000baf6a | 502 | * |
dc2bbdae MD |
503 | * The metadata will get pushed either by the session |
504 | * being stopped or the consumer requesting metadata if | |
505 | * that race is triggered. | |
000baf6a DG |
506 | */ |
507 | if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) { | |
508 | ret = 0; | |
509 | } | |
ffa3f245 | 510 | |
dc2bbdae MD |
511 | /* |
512 | * Update back the actual metadata len sent since it | |
513 | * failed here. | |
514 | */ | |
ffa3f245 | 515 | registry->metadata_len_sent -= len; |
331744e3 JD |
516 | ret_val = ret; |
517 | goto error_push; | |
518 | } | |
519 | ||
520 | free(metadata_str); | |
521 | return len; | |
522 | ||
523 | end: | |
524 | error: | |
ce34fcd0 MD |
525 | if (ret_val) { |
526 | /* | |
dc2bbdae MD |
527 | * On error, flag the registry that the metadata is |
528 | * closed. We were unable to push anything and this | |
529 | * means that either the consumer is not responding or | |
530 | * the metadata cache has been destroyed on the | |
531 | * consumer. | |
ce34fcd0 MD |
532 | */ |
533 | registry->metadata_closed = 1; | |
534 | } | |
331744e3 JD |
535 | error_push: |
536 | free(metadata_str); | |
537 | return ret_val; | |
538 | } | |
539 | ||
d88aee68 | 540 | /* |
ce34fcd0 | 541 | * For a given application and session, push metadata to consumer. |
331744e3 JD |
542 | * Either sock or consumer is required : if sock is NULL, the default |
543 | * socket to send the metadata is retrieved from consumer, if sock | |
544 | * is not NULL we use it to send the metadata. | |
ce34fcd0 | 545 | * RCU read-side lock must be held while calling this function, |
dc2bbdae MD |
546 | * therefore ensuring existance of registry. It also ensures existance |
547 | * of socket throughout this function. | |
d88aee68 DG |
548 | * |
549 | * Return 0 on success else a negative error. | |
550 | */ | |
7972aab2 DG |
551 | static int push_metadata(struct ust_registry_session *registry, |
552 | struct consumer_output *consumer) | |
d88aee68 | 553 | { |
331744e3 JD |
554 | int ret_val; |
555 | ssize_t ret; | |
d88aee68 DG |
556 | struct consumer_socket *socket; |
557 | ||
7972aab2 DG |
558 | assert(registry); |
559 | assert(consumer); | |
560 | ||
ce34fcd0 | 561 | pthread_mutex_lock(®istry->lock); |
ce34fcd0 | 562 | if (registry->metadata_closed) { |
dc2bbdae MD |
563 | ret_val = -EPIPE; |
564 | goto error; | |
d88aee68 DG |
565 | } |
566 | ||
d88aee68 | 567 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
568 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
569 | consumer); | |
d88aee68 | 570 | if (!socket) { |
331744e3 | 571 | ret_val = -1; |
ce34fcd0 | 572 | goto error; |
d88aee68 DG |
573 | } |
574 | ||
331744e3 | 575 | ret = ust_app_push_metadata(registry, socket, 0); |
d88aee68 | 576 | if (ret < 0) { |
331744e3 | 577 | ret_val = ret; |
ce34fcd0 | 578 | goto error; |
d88aee68 | 579 | } |
dc2bbdae | 580 | pthread_mutex_unlock(®istry->lock); |
d88aee68 DG |
581 | return 0; |
582 | ||
ce34fcd0 MD |
583 | error: |
584 | end: | |
dc2bbdae | 585 | pthread_mutex_unlock(®istry->lock); |
331744e3 | 586 | return ret_val; |
d88aee68 DG |
587 | } |
588 | ||
589 | /* | |
590 | * Send to the consumer a close metadata command for the given session. Once | |
591 | * done, the metadata channel is deleted and the session metadata pointer is | |
dc2bbdae | 592 | * nullified. The session lock MUST be held unless the application is |
d88aee68 DG |
593 | * in the destroy path. |
594 | * | |
595 | * Return 0 on success else a negative value. | |
596 | */ | |
7972aab2 DG |
597 | static int close_metadata(struct ust_registry_session *registry, |
598 | struct consumer_output *consumer) | |
d88aee68 DG |
599 | { |
600 | int ret; | |
601 | struct consumer_socket *socket; | |
602 | ||
7972aab2 DG |
603 | assert(registry); |
604 | assert(consumer); | |
d88aee68 | 605 | |
7972aab2 DG |
606 | rcu_read_lock(); |
607 | ||
ce34fcd0 MD |
608 | pthread_mutex_lock(®istry->lock); |
609 | ||
7972aab2 | 610 | if (!registry->metadata_key || registry->metadata_closed) { |
d88aee68 | 611 | ret = 0; |
1b532a60 | 612 | goto end; |
d88aee68 DG |
613 | } |
614 | ||
d88aee68 | 615 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
616 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
617 | consumer); | |
d88aee68 DG |
618 | if (!socket) { |
619 | ret = -1; | |
7972aab2 | 620 | goto error; |
d88aee68 DG |
621 | } |
622 | ||
7972aab2 | 623 | ret = consumer_close_metadata(socket, registry->metadata_key); |
d88aee68 | 624 | if (ret < 0) { |
7972aab2 | 625 | goto error; |
d88aee68 DG |
626 | } |
627 | ||
d88aee68 | 628 | error: |
1b532a60 DG |
629 | /* |
630 | * Metadata closed. Even on error this means that the consumer is not | |
631 | * responding or not found so either way a second close should NOT be emit | |
632 | * for this registry. | |
633 | */ | |
634 | registry->metadata_closed = 1; | |
635 | end: | |
ce34fcd0 | 636 | pthread_mutex_unlock(®istry->lock); |
7972aab2 | 637 | rcu_read_unlock(); |
d88aee68 DG |
638 | return ret; |
639 | } | |
640 | ||
36b588ed MD |
641 | /* |
642 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
643 | * section and outside of call_rcu thread, so we postpone its execution |
644 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
645 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
646 | */ |
647 | static | |
648 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
649 | { | |
650 | struct ust_app_session *ua_sess = | |
651 | caa_container_of(head, struct ust_app_session, rcu_head); | |
652 | ||
0b2dc8df | 653 | ht_cleanup_push(ua_sess->channels); |
36b588ed MD |
654 | free(ua_sess); |
655 | } | |
656 | ||
d80a6244 DG |
657 | /* |
658 | * Delete ust app session safely. RCU read lock must be held before calling | |
659 | * this function. | |
660 | */ | |
8b366481 | 661 | static |
d0b96690 DG |
662 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
663 | struct ust_app *app) | |
d80a6244 DG |
664 | { |
665 | int ret; | |
bec39940 | 666 | struct lttng_ht_iter iter; |
d80a6244 | 667 | struct ust_app_channel *ua_chan; |
7972aab2 | 668 | struct ust_registry_session *registry; |
d80a6244 | 669 | |
d88aee68 DG |
670 | assert(ua_sess); |
671 | ||
1b532a60 DG |
672 | pthread_mutex_lock(&ua_sess->lock); |
673 | ||
7972aab2 | 674 | registry = get_session_registry(ua_sess); |
ce34fcd0 | 675 | if (registry) { |
d88aee68 | 676 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 677 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 678 | |
7972aab2 DG |
679 | /* |
680 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
681 | * metadata only on destroy trace session in this case. Also, the |
682 | * previous push metadata could have flag the metadata registry to | |
683 | * close so don't send a close command if closed. | |
7972aab2 | 684 | */ |
ce34fcd0 | 685 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
686 | /* And ask to close it for this session registry. */ |
687 | (void) close_metadata(registry, ua_sess->consumer); | |
688 | } | |
d80a6244 DG |
689 | } |
690 | ||
bec39940 DG |
691 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
692 | node.node) { | |
693 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 694 | assert(!ret); |
d0b96690 | 695 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 696 | } |
d80a6244 | 697 | |
7972aab2 DG |
698 | /* In case of per PID, the registry is kept in the session. */ |
699 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
700 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
701 | if (reg_pid) { | |
702 | buffer_reg_pid_remove(reg_pid); | |
703 | buffer_reg_pid_destroy(reg_pid); | |
704 | } | |
705 | } | |
d0b96690 | 706 | |
aee6bafd | 707 | if (ua_sess->handle != -1) { |
ffe60014 DG |
708 | ret = ustctl_release_handle(sock, ua_sess->handle); |
709 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
710 | ERR("UST app sock %d release session handle failed with ret %d", | |
711 | sock, ret); | |
712 | } | |
aee6bafd | 713 | } |
1b532a60 DG |
714 | pthread_mutex_unlock(&ua_sess->lock); |
715 | ||
36b588ed | 716 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 717 | } |
91d76f53 DG |
718 | |
719 | /* | |
284d8f55 DG |
720 | * Delete a traceable application structure from the global list. Never call |
721 | * this function outside of a call_rcu call. | |
36b588ed MD |
722 | * |
723 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 724 | */ |
8b366481 DG |
725 | static |
726 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 727 | { |
8b366481 | 728 | int ret, sock; |
d42f20df | 729 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 730 | |
d80a6244 | 731 | /* Delete ust app sessions info */ |
852d0037 DG |
732 | sock = app->sock; |
733 | app->sock = -1; | |
d80a6244 | 734 | |
8b366481 | 735 | /* Wipe sessions */ |
d42f20df DG |
736 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
737 | teardown_node) { | |
738 | /* Free every object in the session and the session. */ | |
36b588ed | 739 | rcu_read_lock(); |
d0b96690 | 740 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 741 | rcu_read_unlock(); |
d80a6244 | 742 | } |
36b588ed | 743 | |
0b2dc8df MD |
744 | ht_cleanup_push(app->sessions); |
745 | ht_cleanup_push(app->ust_objd); | |
d80a6244 | 746 | |
6414a713 | 747 | /* |
852d0037 DG |
748 | * Wait until we have deleted the application from the sock hash table |
749 | * before closing this socket, otherwise an application could re-use the | |
750 | * socket ID and race with the teardown, using the same hash table entry. | |
751 | * | |
752 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
753 | * all RCU readers that could run concurrently with unregister app, | |
754 | * therefore we _need_ to only close that socket after a grace period. So | |
755 | * it should stay in this RCU callback. | |
756 | * | |
757 | * This close() is a very important step of the synchronization model so | |
758 | * every modification to this function must be carefully reviewed. | |
6414a713 | 759 | */ |
799e2c4f MD |
760 | ret = close(sock); |
761 | if (ret) { | |
762 | PERROR("close"); | |
763 | } | |
4063050c | 764 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 765 | |
852d0037 | 766 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 767 | free(app); |
099e26bd DG |
768 | } |
769 | ||
770 | /* | |
f6a9efaa | 771 | * URCU intermediate call to delete an UST app. |
099e26bd | 772 | */ |
8b366481 DG |
773 | static |
774 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 775 | { |
bec39940 DG |
776 | struct lttng_ht_node_ulong *node = |
777 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 778 | struct ust_app *app = |
852d0037 | 779 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 780 | |
852d0037 | 781 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 782 | delete_ust_app(app); |
099e26bd DG |
783 | } |
784 | ||
ffe60014 DG |
785 | /* |
786 | * Delete the session from the application ht and delete the data structure by | |
787 | * freeing every object inside and releasing them. | |
788 | */ | |
d0b96690 | 789 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
790 | struct ust_app_session *ua_sess) |
791 | { | |
792 | int ret; | |
793 | struct lttng_ht_iter iter; | |
794 | ||
795 | assert(app); | |
796 | assert(ua_sess); | |
797 | ||
798 | iter.iter.node = &ua_sess->node.node; | |
799 | ret = lttng_ht_del(app->sessions, &iter); | |
800 | if (ret) { | |
801 | /* Already scheduled for teardown. */ | |
802 | goto end; | |
803 | } | |
804 | ||
805 | /* Once deleted, free the data structure. */ | |
d0b96690 | 806 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
807 | |
808 | end: | |
809 | return; | |
810 | } | |
811 | ||
8b366481 DG |
812 | /* |
813 | * Alloc new UST app session. | |
814 | */ | |
815 | static | |
d0b96690 | 816 | struct ust_app_session *alloc_ust_app_session(struct ust_app *app) |
8b366481 DG |
817 | { |
818 | struct ust_app_session *ua_sess; | |
819 | ||
820 | /* Init most of the default value by allocating and zeroing */ | |
821 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
822 | if (ua_sess == NULL) { | |
823 | PERROR("malloc"); | |
ffe60014 | 824 | goto error_free; |
8b366481 DG |
825 | } |
826 | ||
827 | ua_sess->handle = -1; | |
bec39940 | 828 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
ad7a9107 | 829 | ua_sess->metadata_attr.type = LTTNG_UST_CHAN_METADATA; |
84ad93e8 | 830 | pthread_mutex_init(&ua_sess->lock, NULL); |
ad7a9107 | 831 | |
8b366481 DG |
832 | return ua_sess; |
833 | ||
ffe60014 | 834 | error_free: |
8b366481 DG |
835 | return NULL; |
836 | } | |
837 | ||
838 | /* | |
839 | * Alloc new UST app channel. | |
840 | */ | |
841 | static | |
842 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 843 | struct ust_app_session *ua_sess, |
ffe60014 | 844 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
845 | { |
846 | struct ust_app_channel *ua_chan; | |
847 | ||
848 | /* Init most of the default value by allocating and zeroing */ | |
849 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
850 | if (ua_chan == NULL) { | |
851 | PERROR("malloc"); | |
852 | goto error; | |
853 | } | |
854 | ||
855 | /* Setup channel name */ | |
856 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
857 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
858 | ||
859 | ua_chan->enabled = 1; | |
860 | ua_chan->handle = -1; | |
45893984 | 861 | ua_chan->session = ua_sess; |
ffe60014 | 862 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
863 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
864 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
865 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
866 | |
867 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
31746f93 | 868 | CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); |
8b366481 DG |
869 | |
870 | /* Copy attributes */ | |
871 | if (attr) { | |
ffe60014 | 872 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
873 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
874 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
875 | ua_chan->attr.overwrite = attr->overwrite; | |
876 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
877 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
878 | ua_chan->attr.output = attr->output; | |
8b366481 | 879 | } |
ffe60014 DG |
880 | /* By default, the channel is a per cpu channel. */ |
881 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
882 | |
883 | DBG3("UST app channel %s allocated", ua_chan->name); | |
884 | ||
885 | return ua_chan; | |
886 | ||
887 | error: | |
888 | return NULL; | |
889 | } | |
890 | ||
37f1c236 DG |
891 | /* |
892 | * Allocate and initialize a UST app stream. | |
893 | * | |
894 | * Return newly allocated stream pointer or NULL on error. | |
895 | */ | |
ffe60014 | 896 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
897 | { |
898 | struct ust_app_stream *stream = NULL; | |
899 | ||
900 | stream = zmalloc(sizeof(*stream)); | |
901 | if (stream == NULL) { | |
902 | PERROR("zmalloc ust app stream"); | |
903 | goto error; | |
904 | } | |
905 | ||
906 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
907 | stream->handle = -1; | |
908 | ||
909 | error: | |
910 | return stream; | |
911 | } | |
912 | ||
8b366481 DG |
913 | /* |
914 | * Alloc new UST app event. | |
915 | */ | |
916 | static | |
917 | struct ust_app_event *alloc_ust_app_event(char *name, | |
918 | struct lttng_ust_event *attr) | |
919 | { | |
920 | struct ust_app_event *ua_event; | |
921 | ||
922 | /* Init most of the default value by allocating and zeroing */ | |
923 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
924 | if (ua_event == NULL) { | |
925 | PERROR("malloc"); | |
926 | goto error; | |
927 | } | |
928 | ||
929 | ua_event->enabled = 1; | |
930 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
931 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 932 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
933 | |
934 | /* Copy attributes */ | |
935 | if (attr) { | |
936 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
937 | } | |
938 | ||
939 | DBG3("UST app event %s allocated", ua_event->name); | |
940 | ||
941 | return ua_event; | |
942 | ||
943 | error: | |
944 | return NULL; | |
945 | } | |
946 | ||
947 | /* | |
948 | * Alloc new UST app context. | |
949 | */ | |
950 | static | |
951 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx) | |
952 | { | |
953 | struct ust_app_ctx *ua_ctx; | |
954 | ||
955 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
956 | if (ua_ctx == NULL) { | |
957 | goto error; | |
958 | } | |
959 | ||
31746f93 DG |
960 | CDS_INIT_LIST_HEAD(&ua_ctx->list); |
961 | ||
8b366481 DG |
962 | if (uctx) { |
963 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
964 | } | |
965 | ||
966 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
967 | ||
968 | error: | |
969 | return ua_ctx; | |
970 | } | |
971 | ||
025faf73 DG |
972 | /* |
973 | * Allocate a filter and copy the given original filter. | |
974 | * | |
975 | * Return allocated filter or NULL on error. | |
976 | */ | |
977 | static struct lttng_ust_filter_bytecode *alloc_copy_ust_app_filter( | |
978 | struct lttng_ust_filter_bytecode *orig_f) | |
979 | { | |
980 | struct lttng_ust_filter_bytecode *filter = NULL; | |
981 | ||
982 | /* Copy filter bytecode */ | |
983 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
984 | if (!filter) { | |
985 | PERROR("zmalloc alloc ust app filter"); | |
986 | goto error; | |
987 | } | |
988 | ||
989 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
990 | ||
991 | error: | |
992 | return filter; | |
993 | } | |
994 | ||
099e26bd | 995 | /* |
421cb601 DG |
996 | * Find an ust_app using the sock and return it. RCU read side lock must be |
997 | * held before calling this helper function. | |
099e26bd | 998 | */ |
f20baf8e | 999 | struct ust_app *ust_app_find_by_sock(int sock) |
099e26bd | 1000 | { |
bec39940 | 1001 | struct lttng_ht_node_ulong *node; |
bec39940 | 1002 | struct lttng_ht_iter iter; |
f6a9efaa | 1003 | |
852d0037 | 1004 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 1005 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
1006 | if (node == NULL) { |
1007 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
1008 | goto error; |
1009 | } | |
852d0037 DG |
1010 | |
1011 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
1012 | |
1013 | error: | |
1014 | return NULL; | |
099e26bd DG |
1015 | } |
1016 | ||
d0b96690 DG |
1017 | /* |
1018 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
1019 | * be held before calling this helper function. | |
1020 | */ | |
1021 | static struct ust_app *find_app_by_notify_sock(int sock) | |
1022 | { | |
1023 | struct lttng_ht_node_ulong *node; | |
1024 | struct lttng_ht_iter iter; | |
1025 | ||
1026 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
1027 | &iter); | |
1028 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1029 | if (node == NULL) { | |
1030 | DBG2("UST app find by notify sock %d not found", sock); | |
1031 | goto error; | |
1032 | } | |
1033 | ||
1034 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
1035 | ||
1036 | error: | |
1037 | return NULL; | |
1038 | } | |
1039 | ||
025faf73 DG |
1040 | /* |
1041 | * Lookup for an ust app event based on event name, filter bytecode and the | |
1042 | * event loglevel. | |
1043 | * | |
1044 | * Return an ust_app_event object or NULL on error. | |
1045 | */ | |
18eace3b | 1046 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
39c5a3a7 JI |
1047 | char *name, struct lttng_ust_filter_bytecode *filter, int loglevel, |
1048 | const struct lttng_event_exclusion *exclusion) | |
18eace3b DG |
1049 | { |
1050 | struct lttng_ht_iter iter; | |
1051 | struct lttng_ht_node_str *node; | |
1052 | struct ust_app_event *event = NULL; | |
1053 | struct ust_app_ht_key key; | |
18eace3b DG |
1054 | |
1055 | assert(name); | |
1056 | assert(ht); | |
1057 | ||
1058 | /* Setup key for event lookup. */ | |
1059 | key.name = name; | |
1060 | key.filter = filter; | |
1061 | key.loglevel = loglevel; | |
39c5a3a7 JI |
1062 | /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */ |
1063 | key.exclusion = (struct lttng_ust_event_exclusion *)exclusion; | |
18eace3b | 1064 | |
025faf73 DG |
1065 | /* Lookup using the event name as hash and a custom match fct. */ |
1066 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1067 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1068 | node = lttng_ht_iter_get_node_str(&iter); |
1069 | if (node == NULL) { | |
1070 | goto end; | |
1071 | } | |
1072 | ||
1073 | event = caa_container_of(node, struct ust_app_event, node); | |
1074 | ||
1075 | end: | |
18eace3b DG |
1076 | return event; |
1077 | } | |
1078 | ||
55cc08a6 DG |
1079 | /* |
1080 | * Create the channel context on the tracer. | |
d0b96690 DG |
1081 | * |
1082 | * Called with UST app session lock held. | |
55cc08a6 DG |
1083 | */ |
1084 | static | |
1085 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1086 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1087 | { | |
1088 | int ret; | |
1089 | ||
840cb59c | 1090 | health_code_update(); |
86acf0da | 1091 | |
852d0037 | 1092 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 DG |
1093 | ua_chan->obj, &ua_ctx->obj); |
1094 | if (ret < 0) { | |
ffe60014 DG |
1095 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1096 | ERR("UST app create channel context failed for app (pid: %d) " | |
1097 | "with ret %d", app->pid, ret); | |
1098 | } else { | |
3757b385 DG |
1099 | /* |
1100 | * This is normal behavior, an application can die during the | |
1101 | * creation process. Don't report an error so the execution can | |
1102 | * continue normally. | |
1103 | */ | |
1104 | ret = 0; | |
ffe60014 DG |
1105 | DBG3("UST app disable event failed. Application is dead."); |
1106 | } | |
55cc08a6 DG |
1107 | goto error; |
1108 | } | |
1109 | ||
1110 | ua_ctx->handle = ua_ctx->obj->handle; | |
1111 | ||
d0b96690 DG |
1112 | DBG2("UST app context handle %d created successfully for channel %s", |
1113 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1114 | |
1115 | error: | |
840cb59c | 1116 | health_code_update(); |
55cc08a6 DG |
1117 | return ret; |
1118 | } | |
1119 | ||
53a80697 MD |
1120 | /* |
1121 | * Set the filter on the tracer. | |
1122 | */ | |
1123 | static | |
1124 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
1125 | struct ust_app *app) | |
1126 | { | |
1127 | int ret; | |
1128 | ||
840cb59c | 1129 | health_code_update(); |
86acf0da | 1130 | |
53a80697 | 1131 | if (!ua_event->filter) { |
86acf0da DG |
1132 | ret = 0; |
1133 | goto error; | |
53a80697 MD |
1134 | } |
1135 | ||
1136 | ret = ustctl_set_filter(app->sock, ua_event->filter, | |
1137 | ua_event->obj); | |
1138 | if (ret < 0) { | |
ffe60014 DG |
1139 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1140 | ERR("UST app event %s filter failed for app (pid: %d) " | |
1141 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1142 | } else { | |
3757b385 DG |
1143 | /* |
1144 | * This is normal behavior, an application can die during the | |
1145 | * creation process. Don't report an error so the execution can | |
1146 | * continue normally. | |
1147 | */ | |
1148 | ret = 0; | |
ffe60014 DG |
1149 | DBG3("UST app filter event failed. Application is dead."); |
1150 | } | |
53a80697 MD |
1151 | goto error; |
1152 | } | |
1153 | ||
1154 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
1155 | ||
1156 | error: | |
840cb59c | 1157 | health_code_update(); |
53a80697 MD |
1158 | return ret; |
1159 | } | |
1160 | ||
7cc9a73c JI |
1161 | /* |
1162 | * Set event exclusions on the tracer. | |
1163 | */ | |
1164 | static | |
1165 | int set_ust_event_exclusion(struct ust_app_event *ua_event, | |
1166 | struct ust_app *app) | |
1167 | { | |
1168 | int ret; | |
1169 | ||
1170 | health_code_update(); | |
1171 | ||
1172 | if (!ua_event->exclusion || !ua_event->exclusion->count) { | |
1173 | ret = 0; | |
1174 | goto error; | |
1175 | } | |
1176 | ||
1177 | ret = ustctl_set_exclusion(app->sock, ua_event->exclusion, | |
1178 | ua_event->obj); | |
1179 | if (ret < 0) { | |
1180 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1181 | ERR("UST app event %s exclusions failed for app (pid: %d) " | |
1182 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1183 | } else { | |
1184 | /* | |
1185 | * This is normal behavior, an application can die during the | |
1186 | * creation process. Don't report an error so the execution can | |
1187 | * continue normally. | |
1188 | */ | |
1189 | ret = 0; | |
1190 | DBG3("UST app event exclusion failed. Application is dead."); | |
1191 | } | |
1192 | goto error; | |
1193 | } | |
1194 | ||
1195 | DBG2("UST exclusion set successfully for event %s", ua_event->name); | |
1196 | ||
1197 | error: | |
1198 | health_code_update(); | |
1199 | return ret; | |
1200 | } | |
1201 | ||
9730260e DG |
1202 | /* |
1203 | * Disable the specified event on to UST tracer for the UST session. | |
1204 | */ | |
1205 | static int disable_ust_event(struct ust_app *app, | |
1206 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1207 | { | |
1208 | int ret; | |
1209 | ||
840cb59c | 1210 | health_code_update(); |
86acf0da | 1211 | |
852d0037 | 1212 | ret = ustctl_disable(app->sock, ua_event->obj); |
9730260e | 1213 | if (ret < 0) { |
ffe60014 DG |
1214 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1215 | ERR("UST app event %s disable failed for app (pid: %d) " | |
1216 | "and session handle %d with ret %d", | |
1217 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1218 | } else { | |
3757b385 DG |
1219 | /* |
1220 | * This is normal behavior, an application can die during the | |
1221 | * creation process. Don't report an error so the execution can | |
1222 | * continue normally. | |
1223 | */ | |
1224 | ret = 0; | |
ffe60014 DG |
1225 | DBG3("UST app disable event failed. Application is dead."); |
1226 | } | |
9730260e DG |
1227 | goto error; |
1228 | } | |
1229 | ||
1230 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 1231 | ua_event->attr.name, app->pid); |
9730260e DG |
1232 | |
1233 | error: | |
840cb59c | 1234 | health_code_update(); |
9730260e DG |
1235 | return ret; |
1236 | } | |
1237 | ||
78f0bacd DG |
1238 | /* |
1239 | * Disable the specified channel on to UST tracer for the UST session. | |
1240 | */ | |
1241 | static int disable_ust_channel(struct ust_app *app, | |
1242 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1243 | { | |
1244 | int ret; | |
1245 | ||
840cb59c | 1246 | health_code_update(); |
86acf0da | 1247 | |
852d0037 | 1248 | ret = ustctl_disable(app->sock, ua_chan->obj); |
78f0bacd | 1249 | if (ret < 0) { |
ffe60014 DG |
1250 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1251 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1252 | "and session handle %d with ret %d", | |
1253 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1254 | } else { | |
3757b385 DG |
1255 | /* |
1256 | * This is normal behavior, an application can die during the | |
1257 | * creation process. Don't report an error so the execution can | |
1258 | * continue normally. | |
1259 | */ | |
1260 | ret = 0; | |
ffe60014 DG |
1261 | DBG3("UST app disable channel failed. Application is dead."); |
1262 | } | |
78f0bacd DG |
1263 | goto error; |
1264 | } | |
1265 | ||
78f0bacd | 1266 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1267 | ua_chan->name, app->pid); |
78f0bacd DG |
1268 | |
1269 | error: | |
840cb59c | 1270 | health_code_update(); |
78f0bacd DG |
1271 | return ret; |
1272 | } | |
1273 | ||
1274 | /* | |
1275 | * Enable the specified channel on to UST tracer for the UST session. | |
1276 | */ | |
1277 | static int enable_ust_channel(struct ust_app *app, | |
1278 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1279 | { | |
1280 | int ret; | |
1281 | ||
840cb59c | 1282 | health_code_update(); |
86acf0da | 1283 | |
852d0037 | 1284 | ret = ustctl_enable(app->sock, ua_chan->obj); |
78f0bacd | 1285 | if (ret < 0) { |
ffe60014 DG |
1286 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1287 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1288 | "and session handle %d with ret %d", | |
1289 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1290 | } else { | |
3757b385 DG |
1291 | /* |
1292 | * This is normal behavior, an application can die during the | |
1293 | * creation process. Don't report an error so the execution can | |
1294 | * continue normally. | |
1295 | */ | |
1296 | ret = 0; | |
ffe60014 DG |
1297 | DBG3("UST app enable channel failed. Application is dead."); |
1298 | } | |
78f0bacd DG |
1299 | goto error; |
1300 | } | |
1301 | ||
1302 | ua_chan->enabled = 1; | |
1303 | ||
1304 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1305 | ua_chan->name, app->pid); |
78f0bacd DG |
1306 | |
1307 | error: | |
840cb59c | 1308 | health_code_update(); |
78f0bacd DG |
1309 | return ret; |
1310 | } | |
1311 | ||
edb67388 DG |
1312 | /* |
1313 | * Enable the specified event on to UST tracer for the UST session. | |
1314 | */ | |
1315 | static int enable_ust_event(struct ust_app *app, | |
1316 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1317 | { | |
1318 | int ret; | |
1319 | ||
840cb59c | 1320 | health_code_update(); |
86acf0da | 1321 | |
852d0037 | 1322 | ret = ustctl_enable(app->sock, ua_event->obj); |
edb67388 | 1323 | if (ret < 0) { |
ffe60014 DG |
1324 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1325 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1326 | "and session handle %d with ret %d", | |
1327 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1328 | } else { | |
3757b385 DG |
1329 | /* |
1330 | * This is normal behavior, an application can die during the | |
1331 | * creation process. Don't report an error so the execution can | |
1332 | * continue normally. | |
1333 | */ | |
1334 | ret = 0; | |
ffe60014 DG |
1335 | DBG3("UST app enable event failed. Application is dead."); |
1336 | } | |
edb67388 DG |
1337 | goto error; |
1338 | } | |
1339 | ||
1340 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1341 | ua_event->attr.name, app->pid); |
edb67388 DG |
1342 | |
1343 | error: | |
840cb59c | 1344 | health_code_update(); |
edb67388 DG |
1345 | return ret; |
1346 | } | |
1347 | ||
099e26bd | 1348 | /* |
7972aab2 | 1349 | * Send channel and stream buffer to application. |
4f3ab6ee | 1350 | * |
ffe60014 | 1351 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1352 | */ |
7972aab2 DG |
1353 | static int send_channel_pid_to_ust(struct ust_app *app, |
1354 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1355 | { |
1356 | int ret; | |
ffe60014 | 1357 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1358 | |
1359 | assert(app); | |
ffe60014 | 1360 | assert(ua_sess); |
4f3ab6ee | 1361 | assert(ua_chan); |
4f3ab6ee | 1362 | |
840cb59c | 1363 | health_code_update(); |
4f3ab6ee | 1364 | |
7972aab2 DG |
1365 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1366 | app->sock); | |
86acf0da | 1367 | |
ffe60014 DG |
1368 | /* Send channel to the application. */ |
1369 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
5b4a0ec0 | 1370 | if (ret < 0) { |
b551a063 DG |
1371 | goto error; |
1372 | } | |
1373 | ||
d88aee68 DG |
1374 | health_code_update(); |
1375 | ||
ffe60014 DG |
1376 | /* Send all streams to application. */ |
1377 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1378 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
1379 | if (ret < 0) { | |
1380 | goto error; | |
1381 | } | |
1382 | /* We don't need the stream anymore once sent to the tracer. */ | |
1383 | cds_list_del(&stream->list); | |
1384 | delete_ust_app_stream(-1, stream); | |
1385 | } | |
ffe60014 DG |
1386 | /* Flag the channel that it is sent to the application. */ |
1387 | ua_chan->is_sent = 1; | |
ffe60014 | 1388 | |
b551a063 | 1389 | error: |
840cb59c | 1390 | health_code_update(); |
b551a063 DG |
1391 | return ret; |
1392 | } | |
1393 | ||
91d76f53 | 1394 | /* |
5b4a0ec0 | 1395 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1396 | * |
1397 | * Should be called with session mutex held. | |
91d76f53 | 1398 | */ |
edb67388 DG |
1399 | static |
1400 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1401 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1402 | { |
5b4a0ec0 | 1403 | int ret = 0; |
284d8f55 | 1404 | |
840cb59c | 1405 | health_code_update(); |
86acf0da | 1406 | |
5b4a0ec0 | 1407 | /* Create UST event on tracer */ |
852d0037 | 1408 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 DG |
1409 | &ua_event->obj); |
1410 | if (ret < 0) { | |
ffe60014 DG |
1411 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1412 | ERR("Error ustctl create event %s for app pid: %d with ret %d", | |
1413 | ua_event->attr.name, app->pid, ret); | |
1414 | } else { | |
3757b385 DG |
1415 | /* |
1416 | * This is normal behavior, an application can die during the | |
1417 | * creation process. Don't report an error so the execution can | |
1418 | * continue normally. | |
1419 | */ | |
1420 | ret = 0; | |
ffe60014 DG |
1421 | DBG3("UST app create event failed. Application is dead."); |
1422 | } | |
5b4a0ec0 | 1423 | goto error; |
91d76f53 | 1424 | } |
f6a9efaa | 1425 | |
5b4a0ec0 | 1426 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1427 | |
5b4a0ec0 | 1428 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1429 | ua_event->attr.name, app->pid); |
f6a9efaa | 1430 | |
840cb59c | 1431 | health_code_update(); |
86acf0da | 1432 | |
025faf73 DG |
1433 | /* Set filter if one is present. */ |
1434 | if (ua_event->filter) { | |
1435 | ret = set_ust_event_filter(ua_event, app); | |
1436 | if (ret < 0) { | |
1437 | goto error; | |
1438 | } | |
1439 | } | |
1440 | ||
7cc9a73c JI |
1441 | /* Set exclusions for the event */ |
1442 | if (ua_event->exclusion) { | |
1443 | ret = set_ust_event_exclusion(ua_event, app); | |
1444 | if (ret < 0) { | |
1445 | goto error; | |
1446 | } | |
1447 | } | |
1448 | ||
8535a6d9 | 1449 | /* If event not enabled, disable it on the tracer */ |
40113787 MD |
1450 | if (ua_event->enabled) { |
1451 | /* | |
1452 | * We now need to explicitly enable the event, since it | |
1453 | * is now disabled at creation. | |
1454 | */ | |
1455 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1456 | if (ret < 0) { | |
1457 | /* | |
1458 | * If we hit an EPERM, something is wrong with our enable call. If | |
1459 | * we get an EEXIST, there is a problem on the tracer side since we | |
1460 | * just created it. | |
1461 | */ | |
1462 | switch (ret) { | |
1463 | case -LTTNG_UST_ERR_PERM: | |
1464 | /* Code flow problem */ | |
1465 | assert(0); | |
1466 | case -LTTNG_UST_ERR_EXIST: | |
1467 | /* It's OK for our use case. */ | |
1468 | ret = 0; | |
1469 | break; | |
1470 | default: | |
1471 | break; | |
1472 | } | |
1473 | goto error; | |
1474 | } | |
8535a6d9 DG |
1475 | } |
1476 | ||
5b4a0ec0 | 1477 | error: |
840cb59c | 1478 | health_code_update(); |
5b4a0ec0 | 1479 | return ret; |
91d76f53 | 1480 | } |
48842b30 | 1481 | |
5b4a0ec0 DG |
1482 | /* |
1483 | * Copy data between an UST app event and a LTT event. | |
1484 | */ | |
421cb601 | 1485 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1486 | struct ltt_ust_event *uevent) |
1487 | { | |
b4ffad32 JI |
1488 | size_t exclusion_alloc_size; |
1489 | ||
48842b30 DG |
1490 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); |
1491 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1492 | ||
fc34caaa DG |
1493 | ua_event->enabled = uevent->enabled; |
1494 | ||
5b4a0ec0 DG |
1495 | /* Copy event attributes */ |
1496 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1497 | ||
53a80697 MD |
1498 | /* Copy filter bytecode */ |
1499 | if (uevent->filter) { | |
025faf73 DG |
1500 | ua_event->filter = alloc_copy_ust_app_filter(uevent->filter); |
1501 | /* Filter might be NULL here in case of ENONEM. */ | |
53a80697 | 1502 | } |
b4ffad32 JI |
1503 | |
1504 | /* Copy exclusion data */ | |
1505 | if (uevent->exclusion) { | |
1506 | exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) + | |
1507 | LTTNG_UST_SYM_NAME_LEN * uevent->exclusion->count; | |
1508 | ua_event->exclusion = zmalloc(exclusion_alloc_size); | |
5f8df26c JI |
1509 | if (ua_event->exclusion == NULL) { |
1510 | PERROR("malloc"); | |
1511 | } else { | |
1512 | memcpy(ua_event->exclusion, uevent->exclusion, | |
1513 | exclusion_alloc_size); | |
b4ffad32 JI |
1514 | } |
1515 | } | |
48842b30 DG |
1516 | } |
1517 | ||
5b4a0ec0 DG |
1518 | /* |
1519 | * Copy data between an UST app channel and a LTT channel. | |
1520 | */ | |
421cb601 | 1521 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1522 | struct ltt_ust_channel *uchan) |
1523 | { | |
bec39940 | 1524 | struct lttng_ht_iter iter; |
48842b30 | 1525 | struct ltt_ust_event *uevent; |
55cc08a6 | 1526 | struct ltt_ust_context *uctx; |
48842b30 | 1527 | struct ust_app_event *ua_event; |
55cc08a6 | 1528 | struct ust_app_ctx *ua_ctx; |
48842b30 | 1529 | |
fc34caaa | 1530 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1531 | |
1532 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1533 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 1534 | |
1624d5b7 JD |
1535 | ua_chan->tracefile_size = uchan->tracefile_size; |
1536 | ua_chan->tracefile_count = uchan->tracefile_count; | |
1537 | ||
ffe60014 DG |
1538 | /* Copy event attributes since the layout is different. */ |
1539 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1540 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1541 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1542 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1543 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
1544 | ua_chan->attr.output = uchan->attr.output; | |
1545 | /* | |
1546 | * Note that the attribute channel type is not set since the channel on the | |
1547 | * tracing registry side does not have this information. | |
1548 | */ | |
48842b30 | 1549 | |
fc34caaa | 1550 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1551 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1552 | |
31746f93 | 1553 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { |
55cc08a6 DG |
1554 | ua_ctx = alloc_ust_app_ctx(&uctx->ctx); |
1555 | if (ua_ctx == NULL) { | |
1556 | continue; | |
1557 | } | |
bec39940 DG |
1558 | lttng_ht_node_init_ulong(&ua_ctx->node, |
1559 | (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 1560 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 1561 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
55cc08a6 | 1562 | } |
48842b30 | 1563 | |
421cb601 | 1564 | /* Copy all events from ltt ust channel to ust app channel */ |
bec39940 | 1565 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
18eace3b | 1566 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 1567 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 1568 | if (ua_event == NULL) { |
421cb601 | 1569 | DBG2("UST event %s not found on shadow copy channel", |
48842b30 | 1570 | uevent->attr.name); |
284d8f55 | 1571 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
48842b30 | 1572 | if (ua_event == NULL) { |
5b4a0ec0 | 1573 | continue; |
48842b30 | 1574 | } |
421cb601 | 1575 | shadow_copy_event(ua_event, uevent); |
d0b96690 | 1576 | add_unique_ust_app_event(ua_chan, ua_event); |
48842b30 | 1577 | } |
48842b30 DG |
1578 | } |
1579 | ||
fc34caaa | 1580 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1581 | } |
1582 | ||
5b4a0ec0 DG |
1583 | /* |
1584 | * Copy data between a UST app session and a regular LTT session. | |
1585 | */ | |
421cb601 | 1586 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1587 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1588 | { |
bec39940 DG |
1589 | struct lttng_ht_node_str *ua_chan_node; |
1590 | struct lttng_ht_iter iter; | |
48842b30 DG |
1591 | struct ltt_ust_channel *uchan; |
1592 | struct ust_app_channel *ua_chan; | |
477d7741 MD |
1593 | time_t rawtime; |
1594 | struct tm *timeinfo; | |
1595 | char datetime[16]; | |
1596 | int ret; | |
1597 | ||
1598 | /* Get date and time for unique app path */ | |
1599 | time(&rawtime); | |
1600 | timeinfo = localtime(&rawtime); | |
1601 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1602 | |
421cb601 | 1603 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1604 | |
7972aab2 DG |
1605 | ua_sess->tracing_id = usess->id; |
1606 | ua_sess->id = get_next_session_id(); | |
1607 | ua_sess->uid = app->uid; | |
1608 | ua_sess->gid = app->gid; | |
1609 | ua_sess->euid = usess->uid; | |
1610 | ua_sess->egid = usess->gid; | |
1611 | ua_sess->buffer_type = usess->buffer_type; | |
1612 | ua_sess->bits_per_long = app->bits_per_long; | |
1613 | /* There is only one consumer object per session possible. */ | |
1614 | ua_sess->consumer = usess->consumer; | |
2bba9e53 | 1615 | ua_sess->output_traces = usess->output_traces; |
ecc48a90 | 1616 | ua_sess->live_timer_interval = usess->live_timer_interval; |
84ad93e8 DG |
1617 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, |
1618 | &usess->metadata_attr); | |
7972aab2 DG |
1619 | |
1620 | switch (ua_sess->buffer_type) { | |
1621 | case LTTNG_BUFFER_PER_PID: | |
1622 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 1623 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
1624 | datetime); |
1625 | break; | |
1626 | case LTTNG_BUFFER_PER_UID: | |
1627 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1628 | DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long); | |
1629 | break; | |
1630 | default: | |
1631 | assert(0); | |
1632 | goto error; | |
1633 | } | |
477d7741 MD |
1634 | if (ret < 0) { |
1635 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1636 | assert(0); |
7972aab2 | 1637 | goto error; |
477d7741 MD |
1638 | } |
1639 | ||
48842b30 | 1640 | /* Iterate over all channels in global domain. */ |
bec39940 DG |
1641 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, |
1642 | uchan, node.node) { | |
1643 | struct lttng_ht_iter uiter; | |
ba767faf | 1644 | |
bec39940 DG |
1645 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
1646 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
5b4a0ec0 | 1647 | if (ua_chan_node != NULL) { |
fc34caaa | 1648 | /* Session exist. Contiuing. */ |
5b4a0ec0 DG |
1649 | continue; |
1650 | } | |
421cb601 | 1651 | |
5b4a0ec0 DG |
1652 | DBG2("Channel %s not found on shadow session copy, creating it", |
1653 | uchan->name); | |
d0b96690 | 1654 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
5b4a0ec0 | 1655 | if (ua_chan == NULL) { |
fc34caaa | 1656 | /* malloc failed FIXME: Might want to do handle ENOMEM .. */ |
5b4a0ec0 | 1657 | continue; |
48842b30 | 1658 | } |
5b4a0ec0 | 1659 | shadow_copy_channel(ua_chan, uchan); |
ffe60014 DG |
1660 | /* |
1661 | * The concept of metadata channel does not exist on the tracing | |
1662 | * registry side of the session daemon so this can only be a per CPU | |
1663 | * channel and not metadata. | |
1664 | */ | |
1665 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
1666 | ||
bec39940 | 1667 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); |
48842b30 | 1668 | } |
7972aab2 DG |
1669 | |
1670 | error: | |
1671 | return; | |
48842b30 DG |
1672 | } |
1673 | ||
78f0bacd DG |
1674 | /* |
1675 | * Lookup sesison wrapper. | |
1676 | */ | |
84cd17c6 MD |
1677 | static |
1678 | void __lookup_session_by_app(struct ltt_ust_session *usess, | |
bec39940 | 1679 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1680 | { |
1681 | /* Get right UST app session from app */ | |
d9bf3ca4 | 1682 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
1683 | } |
1684 | ||
421cb601 DG |
1685 | /* |
1686 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1687 | * id. |
421cb601 | 1688 | */ |
48842b30 DG |
1689 | static struct ust_app_session *lookup_session_by_app( |
1690 | struct ltt_ust_session *usess, struct ust_app *app) | |
1691 | { | |
bec39940 | 1692 | struct lttng_ht_iter iter; |
d9bf3ca4 | 1693 | struct lttng_ht_node_u64 *node; |
48842b30 | 1694 | |
84cd17c6 | 1695 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 1696 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
1697 | if (node == NULL) { |
1698 | goto error; | |
1699 | } | |
1700 | ||
1701 | return caa_container_of(node, struct ust_app_session, node); | |
1702 | ||
1703 | error: | |
1704 | return NULL; | |
1705 | } | |
1706 | ||
7972aab2 DG |
1707 | /* |
1708 | * Setup buffer registry per PID for the given session and application. If none | |
1709 | * is found, a new one is created, added to the global registry and | |
1710 | * initialized. If regp is valid, it's set with the newly created object. | |
1711 | * | |
1712 | * Return 0 on success or else a negative value. | |
1713 | */ | |
1714 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
1715 | struct ust_app *app, struct buffer_reg_pid **regp) | |
1716 | { | |
1717 | int ret = 0; | |
1718 | struct buffer_reg_pid *reg_pid; | |
1719 | ||
1720 | assert(ua_sess); | |
1721 | assert(app); | |
1722 | ||
1723 | rcu_read_lock(); | |
1724 | ||
1725 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
1726 | if (!reg_pid) { | |
1727 | /* | |
1728 | * This is the create channel path meaning that if there is NO | |
1729 | * registry available, we have to create one for this session. | |
1730 | */ | |
1731 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid); | |
1732 | if (ret < 0) { | |
1733 | goto error; | |
1734 | } | |
7972aab2 DG |
1735 | } else { |
1736 | goto end; | |
1737 | } | |
1738 | ||
1739 | /* Initialize registry. */ | |
1740 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
1741 | app->bits_per_long, app->uint8_t_alignment, | |
1742 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1743 | app->uint64_t_alignment, app->long_alignment, |
1744 | app->byte_order, app->version.major, | |
1745 | app->version.minor); | |
7972aab2 | 1746 | if (ret < 0) { |
286c991a MD |
1747 | /* |
1748 | * reg_pid->registry->reg.ust is NULL upon error, so we need to | |
1749 | * destroy the buffer registry, because it is always expected | |
1750 | * that if the buffer registry can be found, its ust registry is | |
1751 | * non-NULL. | |
1752 | */ | |
1753 | buffer_reg_pid_destroy(reg_pid); | |
7972aab2 DG |
1754 | goto error; |
1755 | } | |
1756 | ||
286c991a MD |
1757 | buffer_reg_pid_add(reg_pid); |
1758 | ||
7972aab2 DG |
1759 | DBG3("UST app buffer registry per PID created successfully"); |
1760 | ||
1761 | end: | |
1762 | if (regp) { | |
1763 | *regp = reg_pid; | |
1764 | } | |
1765 | error: | |
1766 | rcu_read_unlock(); | |
1767 | return ret; | |
1768 | } | |
1769 | ||
1770 | /* | |
1771 | * Setup buffer registry per UID for the given session and application. If none | |
1772 | * is found, a new one is created, added to the global registry and | |
1773 | * initialized. If regp is valid, it's set with the newly created object. | |
1774 | * | |
1775 | * Return 0 on success or else a negative value. | |
1776 | */ | |
1777 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
1778 | struct ust_app *app, struct buffer_reg_uid **regp) | |
1779 | { | |
1780 | int ret = 0; | |
1781 | struct buffer_reg_uid *reg_uid; | |
1782 | ||
1783 | assert(usess); | |
1784 | assert(app); | |
1785 | ||
1786 | rcu_read_lock(); | |
1787 | ||
1788 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
1789 | if (!reg_uid) { | |
1790 | /* | |
1791 | * This is the create channel path meaning that if there is NO | |
1792 | * registry available, we have to create one for this session. | |
1793 | */ | |
1794 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
1795 | LTTNG_DOMAIN_UST, ®_uid); | |
1796 | if (ret < 0) { | |
1797 | goto error; | |
1798 | } | |
7972aab2 DG |
1799 | } else { |
1800 | goto end; | |
1801 | } | |
1802 | ||
1803 | /* Initialize registry. */ | |
af6142cf | 1804 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
1805 | app->bits_per_long, app->uint8_t_alignment, |
1806 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1807 | app->uint64_t_alignment, app->long_alignment, |
1808 | app->byte_order, app->version.major, | |
1809 | app->version.minor); | |
7972aab2 | 1810 | if (ret < 0) { |
286c991a MD |
1811 | /* |
1812 | * reg_uid->registry->reg.ust is NULL upon error, so we need to | |
1813 | * destroy the buffer registry, because it is always expected | |
1814 | * that if the buffer registry can be found, its ust registry is | |
1815 | * non-NULL. | |
1816 | */ | |
1817 | buffer_reg_uid_destroy(reg_uid, NULL); | |
7972aab2 DG |
1818 | goto error; |
1819 | } | |
1820 | /* Add node to teardown list of the session. */ | |
1821 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
1822 | ||
286c991a | 1823 | buffer_reg_uid_add(reg_uid); |
7972aab2 | 1824 | |
286c991a | 1825 | DBG3("UST app buffer registry per UID created successfully"); |
7972aab2 DG |
1826 | end: |
1827 | if (regp) { | |
1828 | *regp = reg_uid; | |
1829 | } | |
1830 | error: | |
1831 | rcu_read_unlock(); | |
1832 | return ret; | |
1833 | } | |
1834 | ||
421cb601 | 1835 | /* |
3d8ca23b | 1836 | * Create a session on the tracer side for the given app. |
421cb601 | 1837 | * |
3d8ca23b DG |
1838 | * On success, ua_sess_ptr is populated with the session pointer or else left |
1839 | * untouched. If the session was created, is_created is set to 1. On error, | |
1840 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
1841 | * be NULL. | |
1842 | * | |
1843 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
1844 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 1845 | */ |
3d8ca23b DG |
1846 | static int create_ust_app_session(struct ltt_ust_session *usess, |
1847 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, | |
1848 | int *is_created) | |
421cb601 | 1849 | { |
3d8ca23b | 1850 | int ret, created = 0; |
421cb601 DG |
1851 | struct ust_app_session *ua_sess; |
1852 | ||
3d8ca23b DG |
1853 | assert(usess); |
1854 | assert(app); | |
1855 | assert(ua_sess_ptr); | |
1856 | ||
840cb59c | 1857 | health_code_update(); |
86acf0da | 1858 | |
421cb601 DG |
1859 | ua_sess = lookup_session_by_app(usess, app); |
1860 | if (ua_sess == NULL) { | |
d9bf3ca4 | 1861 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 1862 | app->pid, usess->id); |
d0b96690 | 1863 | ua_sess = alloc_ust_app_session(app); |
421cb601 DG |
1864 | if (ua_sess == NULL) { |
1865 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
1866 | ret = -ENOMEM; |
1867 | goto error; | |
421cb601 | 1868 | } |
477d7741 | 1869 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 1870 | created = 1; |
421cb601 DG |
1871 | } |
1872 | ||
7972aab2 DG |
1873 | switch (usess->buffer_type) { |
1874 | case LTTNG_BUFFER_PER_PID: | |
1875 | /* Init local registry. */ | |
1876 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 1877 | if (ret < 0) { |
e64207cf | 1878 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
1879 | goto error; |
1880 | } | |
1881 | break; | |
1882 | case LTTNG_BUFFER_PER_UID: | |
1883 | /* Look for a global registry. If none exists, create one. */ | |
1884 | ret = setup_buffer_reg_uid(usess, app, NULL); | |
1885 | if (ret < 0) { | |
e64207cf | 1886 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
1887 | goto error; |
1888 | } | |
1889 | break; | |
1890 | default: | |
1891 | assert(0); | |
1892 | ret = -EINVAL; | |
1893 | goto error; | |
1894 | } | |
1895 | ||
1896 | health_code_update(); | |
1897 | ||
1898 | if (ua_sess->handle == -1) { | |
1899 | ret = ustctl_create_session(app->sock); | |
1900 | if (ret < 0) { | |
1901 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1902 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
1903 | app->pid, ret); |
1904 | } else { | |
1905 | DBG("UST app creating session failed. Application is dead"); | |
3757b385 DG |
1906 | /* |
1907 | * This is normal behavior, an application can die during the | |
1908 | * creation process. Don't report an error so the execution can | |
1909 | * continue normally. This will get flagged ENOTCONN and the | |
1910 | * caller will handle it. | |
1911 | */ | |
1912 | ret = 0; | |
ffe60014 | 1913 | } |
d0b96690 | 1914 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
1915 | if (ret != -ENOMEM) { |
1916 | /* | |
1917 | * Tracer is probably gone or got an internal error so let's | |
1918 | * behave like it will soon unregister or not usable. | |
1919 | */ | |
1920 | ret = -ENOTCONN; | |
1921 | } | |
1922 | goto error; | |
421cb601 DG |
1923 | } |
1924 | ||
7972aab2 DG |
1925 | ua_sess->handle = ret; |
1926 | ||
1927 | /* Add ust app session to app's HT */ | |
d9bf3ca4 MD |
1928 | lttng_ht_node_init_u64(&ua_sess->node, |
1929 | ua_sess->tracing_id); | |
1930 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
7972aab2 DG |
1931 | |
1932 | DBG2("UST app session created successfully with handle %d", ret); | |
1933 | } | |
1934 | ||
1935 | *ua_sess_ptr = ua_sess; | |
1936 | if (is_created) { | |
1937 | *is_created = created; | |
1938 | } | |
1939 | ||
1940 | /* Everything went well. */ | |
1941 | ret = 0; | |
1942 | ||
1943 | error: | |
1944 | health_code_update(); | |
1945 | return ret; | |
1946 | } | |
1947 | ||
6a6b2068 JG |
1948 | /* |
1949 | * Match function for a hash table lookup of ust_app_ctx. | |
1950 | * | |
1951 | * It matches an ust app context based on the context type and, in the case | |
1952 | * of perf counters, their name. | |
1953 | */ | |
1954 | static int ht_match_ust_app_ctx(struct cds_lfht_node *node, const void *_key) | |
1955 | { | |
1956 | struct ust_app_ctx *ctx; | |
1957 | const struct lttng_ust_context *key; | |
1958 | ||
1959 | assert(node); | |
1960 | assert(_key); | |
1961 | ||
1962 | ctx = caa_container_of(node, struct ust_app_ctx, node.node); | |
1963 | key = _key; | |
1964 | ||
1965 | /* Context type */ | |
1966 | if (ctx->ctx.ctx != key->ctx) { | |
1967 | goto no_match; | |
1968 | } | |
1969 | ||
1970 | /* Check the name in the case of perf thread counters. */ | |
1971 | if (key->ctx == LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER) { | |
1972 | if (strncmp(key->u.perf_counter.name, | |
1973 | ctx->ctx.u.perf_counter.name, | |
1974 | sizeof(key->u.perf_counter.name))) { | |
1975 | goto no_match; | |
1976 | } | |
1977 | } | |
1978 | ||
1979 | /* Match. */ | |
1980 | return 1; | |
1981 | ||
1982 | no_match: | |
1983 | return 0; | |
1984 | } | |
1985 | ||
1986 | /* | |
1987 | * Lookup for an ust app context from an lttng_ust_context. | |
1988 | * | |
be184a0f | 1989 | * Must be called while holding RCU read side lock. |
6a6b2068 JG |
1990 | * Return an ust_app_ctx object or NULL on error. |
1991 | */ | |
1992 | static | |
1993 | struct ust_app_ctx *find_ust_app_context(struct lttng_ht *ht, | |
1994 | struct lttng_ust_context *uctx) | |
1995 | { | |
1996 | struct lttng_ht_iter iter; | |
1997 | struct lttng_ht_node_ulong *node; | |
1998 | struct ust_app_ctx *app_ctx = NULL; | |
1999 | ||
2000 | assert(uctx); | |
2001 | assert(ht); | |
2002 | ||
2003 | /* Lookup using the lttng_ust_context_type and a custom match fct. */ | |
2004 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) uctx->ctx, lttng_ht_seed), | |
2005 | ht_match_ust_app_ctx, uctx, &iter.iter); | |
2006 | node = lttng_ht_iter_get_node_ulong(&iter); | |
2007 | if (!node) { | |
2008 | goto end; | |
2009 | } | |
2010 | ||
2011 | app_ctx = caa_container_of(node, struct ust_app_ctx, node); | |
2012 | ||
2013 | end: | |
2014 | return app_ctx; | |
2015 | } | |
2016 | ||
7972aab2 DG |
2017 | /* |
2018 | * Create a context for the channel on the tracer. | |
2019 | * | |
2020 | * Called with UST app session lock held and a RCU read side lock. | |
2021 | */ | |
2022 | static | |
2023 | int create_ust_app_channel_context(struct ust_app_session *ua_sess, | |
2024 | struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx, | |
2025 | struct ust_app *app) | |
2026 | { | |
2027 | int ret = 0; | |
7972aab2 DG |
2028 | struct ust_app_ctx *ua_ctx; |
2029 | ||
2030 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
2031 | ||
6a6b2068 JG |
2032 | ua_ctx = find_ust_app_context(ua_chan->ctx, uctx); |
2033 | if (ua_ctx) { | |
7972aab2 DG |
2034 | ret = -EEXIST; |
2035 | goto error; | |
2036 | } | |
2037 | ||
2038 | ua_ctx = alloc_ust_app_ctx(uctx); | |
2039 | if (ua_ctx == NULL) { | |
2040 | /* malloc failed */ | |
2041 | ret = -1; | |
2042 | goto error; | |
2043 | } | |
2044 | ||
2045 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 2046 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 2047 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
2048 | |
2049 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
2050 | if (ret < 0) { | |
2051 | goto error; | |
2052 | } | |
2053 | ||
2054 | error: | |
2055 | return ret; | |
2056 | } | |
2057 | ||
2058 | /* | |
2059 | * Enable on the tracer side a ust app event for the session and channel. | |
2060 | * | |
2061 | * Called with UST app session lock held. | |
2062 | */ | |
2063 | static | |
2064 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
2065 | struct ust_app_event *ua_event, struct ust_app *app) | |
2066 | { | |
2067 | int ret; | |
2068 | ||
2069 | ret = enable_ust_event(app, ua_sess, ua_event); | |
2070 | if (ret < 0) { | |
2071 | goto error; | |
2072 | } | |
2073 | ||
2074 | ua_event->enabled = 1; | |
2075 | ||
2076 | error: | |
2077 | return ret; | |
2078 | } | |
2079 | ||
2080 | /* | |
2081 | * Disable on the tracer side a ust app event for the session and channel. | |
2082 | */ | |
2083 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
2084 | struct ust_app_event *ua_event, struct ust_app *app) | |
2085 | { | |
2086 | int ret; | |
2087 | ||
2088 | ret = disable_ust_event(app, ua_sess, ua_event); | |
2089 | if (ret < 0) { | |
2090 | goto error; | |
2091 | } | |
2092 | ||
2093 | ua_event->enabled = 0; | |
2094 | ||
2095 | error: | |
2096 | return ret; | |
2097 | } | |
2098 | ||
2099 | /* | |
2100 | * Lookup ust app channel for session and disable it on the tracer side. | |
2101 | */ | |
2102 | static | |
2103 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
2104 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
2105 | { | |
2106 | int ret; | |
2107 | ||
2108 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2109 | if (ret < 0) { | |
2110 | goto error; | |
2111 | } | |
2112 | ||
2113 | ua_chan->enabled = 0; | |
2114 | ||
2115 | error: | |
2116 | return ret; | |
2117 | } | |
2118 | ||
2119 | /* | |
2120 | * Lookup ust app channel for session and enable it on the tracer side. This | |
2121 | * MUST be called with a RCU read side lock acquired. | |
2122 | */ | |
2123 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
2124 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
2125 | { | |
2126 | int ret = 0; | |
2127 | struct lttng_ht_iter iter; | |
2128 | struct lttng_ht_node_str *ua_chan_node; | |
2129 | struct ust_app_channel *ua_chan; | |
2130 | ||
2131 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
2132 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
2133 | if (ua_chan_node == NULL) { | |
d9bf3ca4 | 2134 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
2135 | uchan->name, ua_sess->tracing_id); |
2136 | goto error; | |
2137 | } | |
2138 | ||
2139 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2140 | ||
2141 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
2142 | if (ret < 0) { | |
2143 | goto error; | |
2144 | } | |
2145 | ||
2146 | error: | |
2147 | return ret; | |
2148 | } | |
2149 | ||
2150 | /* | |
2151 | * Ask the consumer to create a channel and get it if successful. | |
2152 | * | |
2153 | * Return 0 on success or else a negative value. | |
2154 | */ | |
2155 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
2156 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
2157 | int bitness, struct ust_registry_session *registry) | |
2158 | { | |
2159 | int ret; | |
2160 | unsigned int nb_fd = 0; | |
2161 | struct consumer_socket *socket; | |
2162 | ||
2163 | assert(usess); | |
2164 | assert(ua_sess); | |
2165 | assert(ua_chan); | |
2166 | assert(registry); | |
2167 | ||
2168 | rcu_read_lock(); | |
2169 | health_code_update(); | |
2170 | ||
2171 | /* Get the right consumer socket for the application. */ | |
2172 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
2173 | if (!socket) { | |
2174 | ret = -EINVAL; | |
2175 | goto error; | |
2176 | } | |
2177 | ||
2178 | health_code_update(); | |
2179 | ||
2180 | /* Need one fd for the channel. */ | |
2181 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2182 | if (ret < 0) { | |
2183 | ERR("Exhausted number of available FD upon create channel"); | |
2184 | goto error; | |
2185 | } | |
2186 | ||
2187 | /* | |
2188 | * Ask consumer to create channel. The consumer will return the number of | |
2189 | * stream we have to expect. | |
2190 | */ | |
2191 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
2192 | registry); | |
2193 | if (ret < 0) { | |
2194 | goto error_ask; | |
2195 | } | |
2196 | ||
2197 | /* | |
2198 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2199 | * stream (2 being the default value here). | |
2200 | */ | |
2201 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2202 | ||
2203 | /* Reserve the amount of file descriptor we need. */ | |
2204 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2205 | if (ret < 0) { | |
2206 | ERR("Exhausted number of available FD upon create channel"); | |
2207 | goto error_fd_get_stream; | |
2208 | } | |
2209 | ||
2210 | health_code_update(); | |
2211 | ||
2212 | /* | |
2213 | * Now get the channel from the consumer. This call wil populate the stream | |
2214 | * list of that channel and set the ust objects. | |
2215 | */ | |
d9078d0c DG |
2216 | if (usess->consumer->enabled) { |
2217 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2218 | if (ret < 0) { | |
2219 | goto error_destroy; | |
2220 | } | |
7972aab2 DG |
2221 | } |
2222 | ||
2223 | rcu_read_unlock(); | |
2224 | return 0; | |
2225 | ||
2226 | error_destroy: | |
2227 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2228 | error_fd_get_stream: | |
2229 | /* | |
2230 | * Initiate a destroy channel on the consumer since we had an error | |
2231 | * handling it on our side. The return value is of no importance since we | |
2232 | * already have a ret value set by the previous error that we need to | |
2233 | * return. | |
2234 | */ | |
2235 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2236 | error_ask: | |
2237 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2238 | error: | |
2239 | health_code_update(); | |
2240 | rcu_read_unlock(); | |
2241 | return ret; | |
2242 | } | |
2243 | ||
2244 | /* | |
2245 | * Duplicate the ust data object of the ust app stream and save it in the | |
2246 | * buffer registry stream. | |
2247 | * | |
2248 | * Return 0 on success or else a negative value. | |
2249 | */ | |
2250 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2251 | struct ust_app_stream *stream) | |
2252 | { | |
2253 | int ret; | |
2254 | ||
2255 | assert(reg_stream); | |
2256 | assert(stream); | |
2257 | ||
2258 | /* Reserve the amount of file descriptor we need. */ | |
2259 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2260 | if (ret < 0) { | |
2261 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2262 | goto error; | |
2263 | } | |
2264 | ||
2265 | /* Duplicate object for stream once the original is in the registry. */ | |
2266 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2267 | reg_stream->obj.ust); | |
2268 | if (ret < 0) { | |
2269 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2270 | reg_stream->obj.ust, stream->obj, ret); | |
2271 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2272 | goto error; | |
2273 | } | |
2274 | stream->handle = stream->obj->handle; | |
2275 | ||
2276 | error: | |
2277 | return ret; | |
2278 | } | |
2279 | ||
2280 | /* | |
2281 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2282 | * buffer registry channel. | |
2283 | * | |
2284 | * Return 0 on success or else a negative value. | |
2285 | */ | |
2286 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2287 | struct ust_app_channel *ua_chan) | |
2288 | { | |
2289 | int ret; | |
2290 | ||
2291 | assert(reg_chan); | |
2292 | assert(ua_chan); | |
2293 | ||
2294 | /* Need two fds for the channel. */ | |
2295 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2296 | if (ret < 0) { | |
2297 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2298 | goto error_fd_get; | |
2299 | } | |
2300 | ||
2301 | /* Duplicate object for stream once the original is in the registry. */ | |
2302 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2303 | if (ret < 0) { | |
2304 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2305 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2306 | goto error; | |
2307 | } | |
2308 | ua_chan->handle = ua_chan->obj->handle; | |
2309 | ||
2310 | return 0; | |
2311 | ||
2312 | error: | |
2313 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2314 | error_fd_get: | |
2315 | return ret; | |
2316 | } | |
2317 | ||
2318 | /* | |
2319 | * For a given channel buffer registry, setup all streams of the given ust | |
2320 | * application channel. | |
2321 | * | |
2322 | * Return 0 on success or else a negative value. | |
2323 | */ | |
2324 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
2325 | struct ust_app_channel *ua_chan) | |
2326 | { | |
2327 | int ret = 0; | |
2328 | struct ust_app_stream *stream, *stmp; | |
2329 | ||
2330 | assert(reg_chan); | |
2331 | assert(ua_chan); | |
2332 | ||
2333 | DBG2("UST app setup buffer registry stream"); | |
2334 | ||
2335 | /* Send all streams to application. */ | |
2336 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2337 | struct buffer_reg_stream *reg_stream; | |
2338 | ||
2339 | ret = buffer_reg_stream_create(®_stream); | |
2340 | if (ret < 0) { | |
2341 | goto error; | |
2342 | } | |
2343 | ||
2344 | /* | |
2345 | * Keep original pointer and nullify it in the stream so the delete | |
2346 | * stream call does not release the object. | |
2347 | */ | |
2348 | reg_stream->obj.ust = stream->obj; | |
2349 | stream->obj = NULL; | |
2350 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2351 | |
7972aab2 DG |
2352 | /* We don't need the streams anymore. */ |
2353 | cds_list_del(&stream->list); | |
2354 | delete_ust_app_stream(-1, stream); | |
2355 | } | |
421cb601 | 2356 | |
7972aab2 DG |
2357 | error: |
2358 | return ret; | |
2359 | } | |
2360 | ||
2361 | /* | |
2362 | * Create a buffer registry channel for the given session registry and | |
2363 | * application channel object. If regp pointer is valid, it's set with the | |
2364 | * created object. Important, the created object is NOT added to the session | |
2365 | * registry hash table. | |
2366 | * | |
2367 | * Return 0 on success else a negative value. | |
2368 | */ | |
2369 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2370 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2371 | { | |
2372 | int ret; | |
2373 | struct buffer_reg_channel *reg_chan = NULL; | |
2374 | ||
2375 | assert(reg_sess); | |
2376 | assert(ua_chan); | |
2377 | ||
2378 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2379 | ||
2380 | /* Create buffer registry channel. */ | |
2381 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2382 | if (ret < 0) { | |
2383 | goto error_create; | |
421cb601 | 2384 | } |
7972aab2 DG |
2385 | assert(reg_chan); |
2386 | reg_chan->consumer_key = ua_chan->key; | |
8c924c7b | 2387 | reg_chan->subbuf_size = ua_chan->attr.subbuf_size; |
d07ceecd | 2388 | reg_chan->num_subbuf = ua_chan->attr.num_subbuf; |
421cb601 | 2389 | |
7972aab2 DG |
2390 | /* Create and add a channel registry to session. */ |
2391 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2392 | ua_chan->tracing_channel_id); | |
2393 | if (ret < 0) { | |
2394 | goto error; | |
d88aee68 | 2395 | } |
7972aab2 | 2396 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2397 | |
7972aab2 DG |
2398 | if (regp) { |
2399 | *regp = reg_chan; | |
3d8ca23b | 2400 | } |
d88aee68 | 2401 | |
7972aab2 | 2402 | return 0; |
3d8ca23b DG |
2403 | |
2404 | error: | |
7972aab2 DG |
2405 | /* Safe because the registry channel object was not added to any HT. */ |
2406 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2407 | error_create: | |
3d8ca23b | 2408 | return ret; |
421cb601 DG |
2409 | } |
2410 | ||
55cc08a6 | 2411 | /* |
7972aab2 DG |
2412 | * Setup buffer registry channel for the given session registry and application |
2413 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2414 | * |
7972aab2 | 2415 | * Return 0 on success else a negative value. |
55cc08a6 | 2416 | */ |
7972aab2 DG |
2417 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
2418 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan) | |
55cc08a6 | 2419 | { |
7972aab2 | 2420 | int ret; |
55cc08a6 | 2421 | |
7972aab2 DG |
2422 | assert(reg_sess); |
2423 | assert(reg_chan); | |
2424 | assert(ua_chan); | |
2425 | assert(ua_chan->obj); | |
55cc08a6 | 2426 | |
7972aab2 | 2427 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2428 | |
7972aab2 DG |
2429 | /* Setup all streams for the registry. */ |
2430 | ret = setup_buffer_reg_streams(reg_chan, ua_chan); | |
2431 | if (ret < 0) { | |
55cc08a6 DG |
2432 | goto error; |
2433 | } | |
2434 | ||
7972aab2 DG |
2435 | reg_chan->obj.ust = ua_chan->obj; |
2436 | ua_chan->obj = NULL; | |
55cc08a6 | 2437 | |
7972aab2 | 2438 | return 0; |
55cc08a6 DG |
2439 | |
2440 | error: | |
7972aab2 DG |
2441 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2442 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2443 | return ret; |
2444 | } | |
2445 | ||
edb67388 | 2446 | /* |
7972aab2 | 2447 | * Send buffer registry channel to the application. |
d0b96690 | 2448 | * |
7972aab2 | 2449 | * Return 0 on success else a negative value. |
edb67388 | 2450 | */ |
7972aab2 DG |
2451 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2452 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2453 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2454 | { |
2455 | int ret; | |
7972aab2 | 2456 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2457 | |
7972aab2 DG |
2458 | assert(reg_chan); |
2459 | assert(app); | |
2460 | assert(ua_sess); | |
2461 | assert(ua_chan); | |
2462 | ||
2463 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2464 | ||
2465 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2466 | if (ret < 0) { |
2467 | goto error; | |
2468 | } | |
2469 | ||
7972aab2 DG |
2470 | /* Send channel to the application. */ |
2471 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
2472 | if (ret < 0) { | |
2473 | goto error; | |
2474 | } | |
2475 | ||
2476 | health_code_update(); | |
2477 | ||
2478 | /* Send all streams to application. */ | |
2479 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2480 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2481 | struct ust_app_stream stream; | |
2482 | ||
2483 | ret = duplicate_stream_object(reg_stream, &stream); | |
2484 | if (ret < 0) { | |
2485 | goto error_stream_unlock; | |
2486 | } | |
2487 | ||
2488 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2489 | if (ret < 0) { | |
8c067051 | 2490 | (void) release_ust_app_stream(-1, &stream); |
7972aab2 DG |
2491 | goto error_stream_unlock; |
2492 | } | |
edb67388 | 2493 | |
7972aab2 DG |
2494 | /* |
2495 | * The return value is not important here. This function will output an | |
2496 | * error if needed. | |
2497 | */ | |
2498 | (void) release_ust_app_stream(-1, &stream); | |
2499 | } | |
2500 | ua_chan->is_sent = 1; | |
2501 | ||
2502 | error_stream_unlock: | |
2503 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2504 | error: |
2505 | return ret; | |
2506 | } | |
2507 | ||
9730260e | 2508 | /* |
7972aab2 DG |
2509 | * Create and send to the application the created buffers with per UID buffers. |
2510 | * | |
2511 | * Return 0 on success else a negative value. | |
9730260e | 2512 | */ |
7972aab2 DG |
2513 | static int create_channel_per_uid(struct ust_app *app, |
2514 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2515 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2516 | { |
2517 | int ret; | |
7972aab2 DG |
2518 | struct buffer_reg_uid *reg_uid; |
2519 | struct buffer_reg_channel *reg_chan; | |
9730260e | 2520 | |
7972aab2 DG |
2521 | assert(app); |
2522 | assert(usess); | |
2523 | assert(ua_sess); | |
2524 | assert(ua_chan); | |
2525 | ||
2526 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2527 | ||
2528 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2529 | /* | |
2530 | * The session creation handles the creation of this global registry | |
2531 | * object. If none can be find, there is a code flow problem or a | |
2532 | * teardown race. | |
2533 | */ | |
2534 | assert(reg_uid); | |
2535 | ||
2536 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2537 | reg_uid); | |
2538 | if (!reg_chan) { | |
2539 | /* Create the buffer registry channel object. */ | |
2540 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2541 | if (ret < 0) { | |
f14256d6 MD |
2542 | ERR("Error creating the UST channel \"%s\" registry instance", |
2543 | ua_chan->name); | |
7972aab2 DG |
2544 | goto error; |
2545 | } | |
2546 | assert(reg_chan); | |
2547 | ||
2548 | /* | |
2549 | * Create the buffers on the consumer side. This call populates the | |
2550 | * ust app channel object with all streams and data object. | |
2551 | */ | |
2552 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2553 | app->bits_per_long, reg_uid->registry->reg.ust); | |
2554 | if (ret < 0) { | |
f14256d6 MD |
2555 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
2556 | ua_chan->name); | |
2557 | ||
07d2ae95 DG |
2558 | /* |
2559 | * Let's remove the previously created buffer registry channel so | |
2560 | * it's not visible anymore in the session registry. | |
2561 | */ | |
2562 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, | |
2563 | ua_chan->tracing_channel_id); | |
2564 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
2565 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
7972aab2 DG |
2566 | goto error; |
2567 | } | |
2568 | ||
2569 | /* | |
2570 | * Setup the streams and add it to the session registry. | |
2571 | */ | |
2572 | ret = setup_buffer_reg_channel(reg_uid->registry, ua_chan, reg_chan); | |
2573 | if (ret < 0) { | |
f14256d6 MD |
2574 | ERR("Error setting up UST channel \"%s\"", |
2575 | ua_chan->name); | |
7972aab2 DG |
2576 | goto error; |
2577 | } | |
2578 | ||
2579 | } | |
2580 | ||
2581 | /* Send buffers to the application. */ | |
2582 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
9730260e | 2583 | if (ret < 0) { |
f14256d6 MD |
2584 | /* |
2585 | * Don't report error to the console, since it may be | |
2586 | * caused by application concurrently exiting. | |
2587 | */ | |
9730260e DG |
2588 | goto error; |
2589 | } | |
2590 | ||
9730260e DG |
2591 | error: |
2592 | return ret; | |
2593 | } | |
2594 | ||
78f0bacd | 2595 | /* |
7972aab2 DG |
2596 | * Create and send to the application the created buffers with per PID buffers. |
2597 | * | |
2598 | * Return 0 on success else a negative value. | |
78f0bacd | 2599 | */ |
7972aab2 DG |
2600 | static int create_channel_per_pid(struct ust_app *app, |
2601 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2602 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2603 | { |
8535a6d9 | 2604 | int ret; |
7972aab2 | 2605 | struct ust_registry_session *registry; |
78f0bacd | 2606 | |
7972aab2 DG |
2607 | assert(app); |
2608 | assert(usess); | |
2609 | assert(ua_sess); | |
2610 | assert(ua_chan); | |
2611 | ||
2612 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2613 | ||
2614 | rcu_read_lock(); | |
2615 | ||
2616 | registry = get_session_registry(ua_sess); | |
2617 | assert(registry); | |
2618 | ||
2619 | /* Create and add a new channel registry to session. */ | |
2620 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd | 2621 | if (ret < 0) { |
f14256d6 MD |
2622 | ERR("Error creating the UST channel \"%s\" registry instance", |
2623 | ua_chan->name); | |
78f0bacd DG |
2624 | goto error; |
2625 | } | |
2626 | ||
7972aab2 DG |
2627 | /* Create and get channel on the consumer side. */ |
2628 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2629 | app->bits_per_long, registry); | |
2630 | if (ret < 0) { | |
f14256d6 MD |
2631 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
2632 | ua_chan->name); | |
7972aab2 DG |
2633 | goto error; |
2634 | } | |
2635 | ||
2636 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
2637 | if (ret < 0) { | |
f14256d6 MD |
2638 | /* |
2639 | * Don't report error to the console, since it may be | |
2640 | * caused by application concurrently exiting. | |
2641 | */ | |
7972aab2 DG |
2642 | goto error; |
2643 | } | |
8535a6d9 | 2644 | |
78f0bacd | 2645 | error: |
7972aab2 | 2646 | rcu_read_unlock(); |
78f0bacd DG |
2647 | return ret; |
2648 | } | |
2649 | ||
2650 | /* | |
7972aab2 DG |
2651 | * From an already allocated ust app channel, create the channel buffers if |
2652 | * need and send it to the application. This MUST be called with a RCU read | |
2653 | * side lock acquired. | |
2654 | * | |
2655 | * Return 0 on success or else a negative value. | |
78f0bacd | 2656 | */ |
7972aab2 DG |
2657 | static int do_create_channel(struct ust_app *app, |
2658 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2659 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2660 | { |
7972aab2 | 2661 | int ret; |
78f0bacd | 2662 | |
7972aab2 DG |
2663 | assert(app); |
2664 | assert(usess); | |
2665 | assert(ua_sess); | |
2666 | assert(ua_chan); | |
2667 | ||
2668 | /* Handle buffer type before sending the channel to the application. */ | |
2669 | switch (usess->buffer_type) { | |
2670 | case LTTNG_BUFFER_PER_UID: | |
2671 | { | |
2672 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
2673 | if (ret < 0) { | |
2674 | goto error; | |
2675 | } | |
2676 | break; | |
2677 | } | |
2678 | case LTTNG_BUFFER_PER_PID: | |
2679 | { | |
2680 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
2681 | if (ret < 0) { | |
2682 | goto error; | |
2683 | } | |
2684 | break; | |
2685 | } | |
2686 | default: | |
2687 | assert(0); | |
2688 | ret = -EINVAL; | |
78f0bacd DG |
2689 | goto error; |
2690 | } | |
2691 | ||
7972aab2 DG |
2692 | /* Initialize ust objd object using the received handle and add it. */ |
2693 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
2694 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 2695 | |
7972aab2 DG |
2696 | /* If channel is not enabled, disable it on the tracer */ |
2697 | if (!ua_chan->enabled) { | |
2698 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2699 | if (ret < 0) { | |
2700 | goto error; | |
2701 | } | |
78f0bacd DG |
2702 | } |
2703 | ||
2704 | error: | |
2705 | return ret; | |
2706 | } | |
2707 | ||
284d8f55 | 2708 | /* |
4d710ac2 DG |
2709 | * Create UST app channel and create it on the tracer. Set ua_chanp of the |
2710 | * newly created channel if not NULL. | |
d0b96690 | 2711 | * |
36b588ed | 2712 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 DG |
2713 | * |
2714 | * Return 0 on success or else a negative value. | |
284d8f55 | 2715 | */ |
4d710ac2 DG |
2716 | static int create_ust_app_channel(struct ust_app_session *ua_sess, |
2717 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
7972aab2 | 2718 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 2719 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
2720 | { |
2721 | int ret = 0; | |
bec39940 DG |
2722 | struct lttng_ht_iter iter; |
2723 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
2724 | struct ust_app_channel *ua_chan; |
2725 | ||
2726 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
2727 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
2728 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 2729 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 2730 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 2731 | goto end; |
5b4a0ec0 DG |
2732 | } |
2733 | ||
d0b96690 | 2734 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
2735 | if (ua_chan == NULL) { |
2736 | /* Only malloc can fail here */ | |
4d710ac2 | 2737 | ret = -ENOMEM; |
094d1690 | 2738 | goto error_alloc; |
fc34caaa DG |
2739 | } |
2740 | shadow_copy_channel(ua_chan, uchan); | |
2741 | ||
ffe60014 DG |
2742 | /* Set channel type. */ |
2743 | ua_chan->attr.type = type; | |
2744 | ||
7972aab2 | 2745 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
5b4a0ec0 DG |
2746 | if (ret < 0) { |
2747 | goto error; | |
2748 | } | |
2749 | ||
fc34caaa | 2750 | DBG2("UST app create channel %s for PID %d completed", ua_chan->name, |
852d0037 | 2751 | app->pid); |
fc34caaa | 2752 | |
d0b96690 DG |
2753 | /* Only add the channel if successful on the tracer side. */ |
2754 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
2755 | ||
fc34caaa | 2756 | end: |
4d710ac2 DG |
2757 | if (ua_chanp) { |
2758 | *ua_chanp = ua_chan; | |
2759 | } | |
2760 | ||
2761 | /* Everything went well. */ | |
2762 | return 0; | |
5b4a0ec0 DG |
2763 | |
2764 | error: | |
d0b96690 | 2765 | delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app); |
094d1690 | 2766 | error_alloc: |
4d710ac2 | 2767 | return ret; |
5b4a0ec0 DG |
2768 | } |
2769 | ||
2770 | /* | |
2771 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
2772 | * |
2773 | * Called with ust app session mutex held. | |
5b4a0ec0 | 2774 | */ |
edb67388 DG |
2775 | static |
2776 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
2777 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
2778 | struct ust_app *app) | |
284d8f55 | 2779 | { |
edb67388 | 2780 | int ret = 0; |
5b4a0ec0 | 2781 | struct ust_app_event *ua_event; |
284d8f55 | 2782 | |
5b4a0ec0 | 2783 | /* Get event node */ |
18eace3b | 2784 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 2785 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 2786 | if (ua_event != NULL) { |
fc34caaa | 2787 | ret = -EEXIST; |
edb67388 DG |
2788 | goto end; |
2789 | } | |
5b4a0ec0 | 2790 | |
edb67388 DG |
2791 | /* Does not exist so create one */ |
2792 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); | |
2793 | if (ua_event == NULL) { | |
2794 | /* Only malloc can failed so something is really wrong */ | |
2795 | ret = -ENOMEM; | |
fc34caaa | 2796 | goto end; |
5b4a0ec0 | 2797 | } |
edb67388 | 2798 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 2799 | |
edb67388 | 2800 | /* Create it on the tracer side */ |
5b4a0ec0 | 2801 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 2802 | if (ret < 0) { |
fc34caaa | 2803 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 2804 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
2805 | goto error; |
2806 | } | |
2807 | ||
d0b96690 | 2808 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 2809 | |
fc34caaa | 2810 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 2811 | app->pid); |
7f79d3a1 | 2812 | |
edb67388 | 2813 | end: |
fc34caaa DG |
2814 | return ret; |
2815 | ||
5b4a0ec0 | 2816 | error: |
fc34caaa DG |
2817 | /* Valid. Calling here is already in a read side lock */ |
2818 | delete_ust_app_event(-1, ua_event); | |
edb67388 | 2819 | return ret; |
5b4a0ec0 DG |
2820 | } |
2821 | ||
2822 | /* | |
2823 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 2824 | * |
7972aab2 | 2825 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
2826 | */ |
2827 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
ad7a9107 | 2828 | struct ust_app *app, struct consumer_output *consumer) |
5b4a0ec0 DG |
2829 | { |
2830 | int ret = 0; | |
ffe60014 | 2831 | struct ust_app_channel *metadata; |
d88aee68 | 2832 | struct consumer_socket *socket; |
7972aab2 | 2833 | struct ust_registry_session *registry; |
5b4a0ec0 | 2834 | |
ffe60014 DG |
2835 | assert(ua_sess); |
2836 | assert(app); | |
d88aee68 | 2837 | assert(consumer); |
5b4a0ec0 | 2838 | |
7972aab2 DG |
2839 | registry = get_session_registry(ua_sess); |
2840 | assert(registry); | |
2841 | ||
ce34fcd0 MD |
2842 | pthread_mutex_lock(®istry->lock); |
2843 | ||
1b532a60 DG |
2844 | /* Metadata already exists for this registry or it was closed previously */ |
2845 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
2846 | ret = 0; |
2847 | goto error; | |
5b4a0ec0 DG |
2848 | } |
2849 | ||
ffe60014 | 2850 | /* Allocate UST metadata */ |
d0b96690 | 2851 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
2852 | if (!metadata) { |
2853 | /* malloc() failed */ | |
2854 | ret = -ENOMEM; | |
2855 | goto error; | |
2856 | } | |
5b4a0ec0 | 2857 | |
ad7a9107 | 2858 | memcpy(&metadata->attr, &ua_sess->metadata_attr, sizeof(metadata->attr)); |
5b4a0ec0 | 2859 | |
7972aab2 DG |
2860 | /* Need one fd for the channel. */ |
2861 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2862 | if (ret < 0) { | |
2863 | ERR("Exhausted number of available FD upon create metadata"); | |
2864 | goto error; | |
2865 | } | |
2866 | ||
4dc3dfc5 DG |
2867 | /* Get the right consumer socket for the application. */ |
2868 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
2869 | if (!socket) { | |
2870 | ret = -EINVAL; | |
2871 | goto error_consumer; | |
2872 | } | |
2873 | ||
331744e3 JD |
2874 | /* |
2875 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
2876 | * to the registry *before* we ask the consumer so we avoid the race of the | |
2877 | * consumer requesting the metadata and the ask_channel call on our side | |
2878 | * did not returned yet. | |
2879 | */ | |
2880 | registry->metadata_key = metadata->key; | |
2881 | ||
d88aee68 DG |
2882 | /* |
2883 | * Ask the metadata channel creation to the consumer. The metadata object | |
2884 | * will be created by the consumer and kept their. However, the stream is | |
2885 | * never added or monitored until we do a first push metadata to the | |
2886 | * consumer. | |
2887 | */ | |
7972aab2 DG |
2888 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
2889 | registry); | |
d88aee68 | 2890 | if (ret < 0) { |
f2a444f1 DG |
2891 | /* Nullify the metadata key so we don't try to close it later on. */ |
2892 | registry->metadata_key = 0; | |
d88aee68 DG |
2893 | goto error_consumer; |
2894 | } | |
2895 | ||
2896 | /* | |
2897 | * The setup command will make the metadata stream be sent to the relayd, | |
2898 | * if applicable, and the thread managing the metadatas. This is important | |
2899 | * because after this point, if an error occurs, the only way the stream | |
2900 | * can be deleted is to be monitored in the consumer. | |
2901 | */ | |
7972aab2 | 2902 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 2903 | if (ret < 0) { |
f2a444f1 DG |
2904 | /* Nullify the metadata key so we don't try to close it later on. */ |
2905 | registry->metadata_key = 0; | |
d88aee68 | 2906 | goto error_consumer; |
5b4a0ec0 DG |
2907 | } |
2908 | ||
7972aab2 DG |
2909 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
2910 | metadata->key, app->pid); | |
5b4a0ec0 | 2911 | |
d88aee68 | 2912 | error_consumer: |
b80f0b6c | 2913 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 2914 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 2915 | error: |
ce34fcd0 | 2916 | pthread_mutex_unlock(®istry->lock); |
ffe60014 | 2917 | return ret; |
5b4a0ec0 DG |
2918 | } |
2919 | ||
5b4a0ec0 | 2920 | /* |
d88aee68 DG |
2921 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
2922 | * acquired before calling this function. | |
5b4a0ec0 DG |
2923 | */ |
2924 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
2925 | { | |
d88aee68 | 2926 | struct ust_app *app = NULL; |
bec39940 DG |
2927 | struct lttng_ht_node_ulong *node; |
2928 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 2929 | |
bec39940 DG |
2930 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
2931 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
2932 | if (node == NULL) { |
2933 | DBG2("UST app no found with pid %d", pid); | |
2934 | goto error; | |
2935 | } | |
5b4a0ec0 DG |
2936 | |
2937 | DBG2("Found UST app by pid %d", pid); | |
2938 | ||
d88aee68 | 2939 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
2940 | |
2941 | error: | |
d88aee68 | 2942 | return app; |
5b4a0ec0 DG |
2943 | } |
2944 | ||
d88aee68 DG |
2945 | /* |
2946 | * Allocate and init an UST app object using the registration information and | |
2947 | * the command socket. This is called when the command socket connects to the | |
2948 | * session daemon. | |
2949 | * | |
2950 | * The object is returned on success or else NULL. | |
2951 | */ | |
d0b96690 | 2952 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 2953 | { |
d0b96690 DG |
2954 | struct ust_app *lta = NULL; |
2955 | ||
2956 | assert(msg); | |
2957 | assert(sock >= 0); | |
2958 | ||
2959 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 2960 | |
173af62f DG |
2961 | if ((msg->bits_per_long == 64 && |
2962 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
2963 | || (msg->bits_per_long == 32 && | |
2964 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 2965 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
2966 | "%d-bit long, but no consumerd for this size is available.\n", |
2967 | msg->name, msg->pid, msg->bits_per_long); | |
2968 | goto error; | |
3f2c5fcc | 2969 | } |
d0b96690 | 2970 | |
5b4a0ec0 DG |
2971 | lta = zmalloc(sizeof(struct ust_app)); |
2972 | if (lta == NULL) { | |
2973 | PERROR("malloc"); | |
d0b96690 | 2974 | goto error; |
5b4a0ec0 DG |
2975 | } |
2976 | ||
2977 | lta->ppid = msg->ppid; | |
2978 | lta->uid = msg->uid; | |
2979 | lta->gid = msg->gid; | |
d0b96690 | 2980 | |
7753dea8 | 2981 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
2982 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
2983 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
2984 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
2985 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
2986 | lta->long_alignment = msg->long_alignment; | |
2987 | lta->byte_order = msg->byte_order; | |
2988 | ||
5b4a0ec0 DG |
2989 | lta->v_major = msg->major; |
2990 | lta->v_minor = msg->minor; | |
d9bf3ca4 | 2991 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 DG |
2992 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
2993 | lta->notify_sock = -1; | |
d88aee68 DG |
2994 | |
2995 | /* Copy name and make sure it's NULL terminated. */ | |
2996 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
2997 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
2998 | ||
2999 | /* | |
3000 | * Before this can be called, when receiving the registration information, | |
3001 | * the application compatibility is checked. So, at this point, the | |
3002 | * application can work with this session daemon. | |
3003 | */ | |
d0b96690 | 3004 | lta->compatible = 1; |
5b4a0ec0 | 3005 | |
852d0037 | 3006 | lta->pid = msg->pid; |
d0b96690 | 3007 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 3008 | lta->sock = sock; |
d0b96690 | 3009 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 3010 | |
d42f20df DG |
3011 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
3012 | ||
d0b96690 DG |
3013 | error: |
3014 | return lta; | |
3015 | } | |
3016 | ||
d88aee68 DG |
3017 | /* |
3018 | * For a given application object, add it to every hash table. | |
3019 | */ | |
d0b96690 DG |
3020 | void ust_app_add(struct ust_app *app) |
3021 | { | |
3022 | assert(app); | |
3023 | assert(app->notify_sock >= 0); | |
3024 | ||
5b4a0ec0 | 3025 | rcu_read_lock(); |
852d0037 DG |
3026 | |
3027 | /* | |
3028 | * On a re-registration, we want to kick out the previous registration of | |
3029 | * that pid | |
3030 | */ | |
d0b96690 | 3031 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
3032 | |
3033 | /* | |
3034 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
3035 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
3036 | * already in the table. | |
3037 | */ | |
d0b96690 | 3038 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 3039 | |
d0b96690 DG |
3040 | /* Add application to the notify socket hash table. */ |
3041 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
3042 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 3043 | |
d0b96690 | 3044 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
3045 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
3046 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
3047 | app->v_minor); | |
5b4a0ec0 | 3048 | |
d0b96690 DG |
3049 | rcu_read_unlock(); |
3050 | } | |
3051 | ||
d88aee68 DG |
3052 | /* |
3053 | * Set the application version into the object. | |
3054 | * | |
3055 | * Return 0 on success else a negative value either an errno code or a | |
3056 | * LTTng-UST error code. | |
3057 | */ | |
d0b96690 DG |
3058 | int ust_app_version(struct ust_app *app) |
3059 | { | |
d88aee68 DG |
3060 | int ret; |
3061 | ||
d0b96690 | 3062 | assert(app); |
d88aee68 DG |
3063 | |
3064 | ret = ustctl_tracer_version(app->sock, &app->version); | |
3065 | if (ret < 0) { | |
3066 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
5368d366 | 3067 | ERR("UST app %d version failed with ret %d", app->sock, ret); |
d88aee68 | 3068 | } else { |
5368d366 | 3069 | DBG3("UST app %d version failed. Application is dead", app->sock); |
d88aee68 DG |
3070 | } |
3071 | } | |
3072 | ||
3073 | return ret; | |
5b4a0ec0 DG |
3074 | } |
3075 | ||
3076 | /* | |
3077 | * Unregister app by removing it from the global traceable app list and freeing | |
3078 | * the data struct. | |
3079 | * | |
3080 | * The socket is already closed at this point so no close to sock. | |
3081 | */ | |
3082 | void ust_app_unregister(int sock) | |
3083 | { | |
3084 | struct ust_app *lta; | |
bec39940 | 3085 | struct lttng_ht_node_ulong *node; |
c4b88406 | 3086 | struct lttng_ht_iter ust_app_sock_iter; |
bec39940 | 3087 | struct lttng_ht_iter iter; |
d42f20df | 3088 | struct ust_app_session *ua_sess; |
525b0740 | 3089 | int ret; |
5b4a0ec0 DG |
3090 | |
3091 | rcu_read_lock(); | |
886459c6 | 3092 | |
5b4a0ec0 | 3093 | /* Get the node reference for a call_rcu */ |
c4b88406 MD |
3094 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &ust_app_sock_iter); |
3095 | node = lttng_ht_iter_get_node_ulong(&ust_app_sock_iter); | |
d0b96690 | 3096 | assert(node); |
284d8f55 | 3097 | |
852d0037 | 3098 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
3099 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
3100 | ||
d88aee68 | 3101 | /* |
ce34fcd0 MD |
3102 | * For per-PID buffers, perform "push metadata" and flush all |
3103 | * application streams before removing app from hash tables, | |
3104 | * ensuring proper behavior of data_pending check. | |
c4b88406 | 3105 | * Remove sessions so they are not visible during deletion. |
d88aee68 | 3106 | */ |
d42f20df DG |
3107 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, |
3108 | node.node) { | |
7972aab2 DG |
3109 | struct ust_registry_session *registry; |
3110 | ||
d42f20df DG |
3111 | ret = lttng_ht_del(lta->sessions, &iter); |
3112 | if (ret) { | |
3113 | /* The session was already removed so scheduled for teardown. */ | |
3114 | continue; | |
3115 | } | |
3116 | ||
ce34fcd0 MD |
3117 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { |
3118 | (void) ust_app_flush_app_session(lta, ua_sess); | |
3119 | } | |
c4b88406 | 3120 | |
d42f20df DG |
3121 | /* |
3122 | * Add session to list for teardown. This is safe since at this point we | |
3123 | * are the only one using this list. | |
3124 | */ | |
d88aee68 DG |
3125 | pthread_mutex_lock(&ua_sess->lock); |
3126 | ||
3127 | /* | |
3128 | * Normally, this is done in the delete session process which is | |
3129 | * executed in the call rcu below. However, upon registration we can't | |
3130 | * afford to wait for the grace period before pushing data or else the | |
3131 | * data pending feature can race between the unregistration and stop | |
3132 | * command where the data pending command is sent *before* the grace | |
3133 | * period ended. | |
3134 | * | |
3135 | * The close metadata below nullifies the metadata pointer in the | |
3136 | * session so the delete session will NOT push/close a second time. | |
3137 | */ | |
7972aab2 | 3138 | registry = get_session_registry(ua_sess); |
ce34fcd0 | 3139 | if (registry) { |
7972aab2 DG |
3140 | /* Push metadata for application before freeing the application. */ |
3141 | (void) push_metadata(registry, ua_sess->consumer); | |
3142 | ||
3143 | /* | |
3144 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
3145 | * metadata only on destroy trace session in this case. Also, the |
3146 | * previous push metadata could have flag the metadata registry to | |
3147 | * close so don't send a close command if closed. | |
7972aab2 | 3148 | */ |
ce34fcd0 | 3149 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
3150 | /* And ask to close it for this session registry. */ |
3151 | (void) close_metadata(registry, ua_sess->consumer); | |
3152 | } | |
3153 | } | |
d42f20df | 3154 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
c4b88406 | 3155 | |
d88aee68 | 3156 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
3157 | } |
3158 | ||
c4b88406 MD |
3159 | /* Remove application from PID hash table */ |
3160 | ret = lttng_ht_del(ust_app_ht_by_sock, &ust_app_sock_iter); | |
3161 | assert(!ret); | |
3162 | ||
3163 | /* | |
3164 | * Remove application from notify hash table. The thread handling the | |
3165 | * notify socket could have deleted the node so ignore on error because | |
3166 | * either way it's valid. The close of that socket is handled by the other | |
3167 | * thread. | |
3168 | */ | |
3169 | iter.iter.node = <a->notify_sock_n.node; | |
3170 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3171 | ||
3172 | /* | |
3173 | * Ignore return value since the node might have been removed before by an | |
3174 | * add replace during app registration because the PID can be reassigned by | |
3175 | * the OS. | |
3176 | */ | |
3177 | iter.iter.node = <a->pid_n.node; | |
3178 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3179 | if (ret) { | |
3180 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
3181 | lta->pid); | |
3182 | } | |
3183 | ||
852d0037 DG |
3184 | /* Free memory */ |
3185 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
3186 | ||
5b4a0ec0 DG |
3187 | rcu_read_unlock(); |
3188 | return; | |
284d8f55 DG |
3189 | } |
3190 | ||
5b4a0ec0 DG |
3191 | /* |
3192 | * Fill events array with all events name of all registered apps. | |
3193 | */ | |
3194 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 3195 | { |
5b4a0ec0 DG |
3196 | int ret, handle; |
3197 | size_t nbmem, count = 0; | |
bec39940 | 3198 | struct lttng_ht_iter iter; |
5b4a0ec0 | 3199 | struct ust_app *app; |
c617c0c6 | 3200 | struct lttng_event *tmp_event; |
421cb601 | 3201 | |
5b4a0ec0 | 3202 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
3203 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
3204 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
3205 | PERROR("zmalloc ust app events"); |
3206 | ret = -ENOMEM; | |
421cb601 DG |
3207 | goto error; |
3208 | } | |
3209 | ||
5b4a0ec0 | 3210 | rcu_read_lock(); |
421cb601 | 3211 | |
852d0037 | 3212 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 3213 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 3214 | |
840cb59c | 3215 | health_code_update(); |
86acf0da | 3216 | |
e0c7ec2b DG |
3217 | if (!app->compatible) { |
3218 | /* | |
3219 | * TODO: In time, we should notice the caller of this error by | |
3220 | * telling him that this is a version error. | |
3221 | */ | |
3222 | continue; | |
3223 | } | |
852d0037 | 3224 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 3225 | if (handle < 0) { |
ffe60014 DG |
3226 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3227 | ERR("UST app list events getting handle failed for app pid %d", | |
3228 | app->pid); | |
3229 | } | |
5b4a0ec0 DG |
3230 | continue; |
3231 | } | |
421cb601 | 3232 | |
852d0037 | 3233 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 3234 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3235 | /* Handle ustctl error. */ |
3236 | if (ret < 0) { | |
a2ba1ab0 | 3237 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3238 | ERR("UST app tp list get failed for app %d with ret %d", |
3239 | app->sock, ret); | |
3240 | } else { | |
3241 | DBG3("UST app tp list get failed. Application is dead"); | |
3757b385 DG |
3242 | /* |
3243 | * This is normal behavior, an application can die during the | |
3244 | * creation process. Don't report an error so the execution can | |
3245 | * continue normally. Continue normal execution. | |
3246 | */ | |
3247 | break; | |
ffe60014 | 3248 | } |
98f595d4 | 3249 | free(tmp_event); |
ffe60014 DG |
3250 | goto rcu_error; |
3251 | } | |
3252 | ||
840cb59c | 3253 | health_code_update(); |
815564d8 | 3254 | if (count >= nbmem) { |
d7b3776f | 3255 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3256 | struct lttng_event *new_tmp_event; |
3257 | size_t new_nbmem; | |
3258 | ||
3259 | new_nbmem = nbmem << 1; | |
3260 | DBG2("Reallocating event list from %zu to %zu entries", | |
3261 | nbmem, new_nbmem); | |
3262 | new_tmp_event = realloc(tmp_event, | |
3263 | new_nbmem * sizeof(struct lttng_event)); | |
3264 | if (new_tmp_event == NULL) { | |
5b4a0ec0 | 3265 | PERROR("realloc ust app events"); |
c617c0c6 | 3266 | free(tmp_event); |
5b4a0ec0 DG |
3267 | ret = -ENOMEM; |
3268 | goto rcu_error; | |
3269 | } | |
53efb85a MD |
3270 | /* Zero the new memory */ |
3271 | memset(new_tmp_event + nbmem, 0, | |
3272 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
3273 | nbmem = new_nbmem; | |
3274 | tmp_event = new_tmp_event; | |
5b4a0ec0 | 3275 | } |
c617c0c6 MD |
3276 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
3277 | tmp_event[count].loglevel = uiter.loglevel; | |
3278 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
3279 | tmp_event[count].pid = app->pid; | |
3280 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 3281 | count++; |
421cb601 | 3282 | } |
421cb601 DG |
3283 | } |
3284 | ||
5b4a0ec0 | 3285 | ret = count; |
c617c0c6 | 3286 | *events = tmp_event; |
421cb601 | 3287 | |
5b4a0ec0 | 3288 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 3289 | |
5b4a0ec0 DG |
3290 | rcu_error: |
3291 | rcu_read_unlock(); | |
421cb601 | 3292 | error: |
840cb59c | 3293 | health_code_update(); |
5b4a0ec0 | 3294 | return ret; |
421cb601 DG |
3295 | } |
3296 | ||
f37d259d MD |
3297 | /* |
3298 | * Fill events array with all events name of all registered apps. | |
3299 | */ | |
3300 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
3301 | { | |
3302 | int ret, handle; | |
3303 | size_t nbmem, count = 0; | |
3304 | struct lttng_ht_iter iter; | |
3305 | struct ust_app *app; | |
c617c0c6 | 3306 | struct lttng_event_field *tmp_event; |
f37d259d MD |
3307 | |
3308 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
3309 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
3310 | if (tmp_event == NULL) { | |
f37d259d MD |
3311 | PERROR("zmalloc ust app event fields"); |
3312 | ret = -ENOMEM; | |
3313 | goto error; | |
3314 | } | |
3315 | ||
3316 | rcu_read_lock(); | |
3317 | ||
3318 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3319 | struct lttng_ust_field_iter uiter; | |
3320 | ||
840cb59c | 3321 | health_code_update(); |
86acf0da | 3322 | |
f37d259d MD |
3323 | if (!app->compatible) { |
3324 | /* | |
3325 | * TODO: In time, we should notice the caller of this error by | |
3326 | * telling him that this is a version error. | |
3327 | */ | |
3328 | continue; | |
3329 | } | |
3330 | handle = ustctl_tracepoint_field_list(app->sock); | |
3331 | if (handle < 0) { | |
ffe60014 DG |
3332 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3333 | ERR("UST app list field getting handle failed for app pid %d", | |
3334 | app->pid); | |
3335 | } | |
f37d259d MD |
3336 | continue; |
3337 | } | |
3338 | ||
3339 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 3340 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3341 | /* Handle ustctl error. */ |
3342 | if (ret < 0) { | |
a2ba1ab0 | 3343 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3344 | ERR("UST app tp list field failed for app %d with ret %d", |
3345 | app->sock, ret); | |
3346 | } else { | |
3347 | DBG3("UST app tp list field failed. Application is dead"); | |
3757b385 DG |
3348 | /* |
3349 | * This is normal behavior, an application can die during the | |
3350 | * creation process. Don't report an error so the execution can | |
98f595d4 | 3351 | * continue normally. Reset list and count for next app. |
3757b385 DG |
3352 | */ |
3353 | break; | |
ffe60014 | 3354 | } |
98f595d4 | 3355 | free(tmp_event); |
ffe60014 DG |
3356 | goto rcu_error; |
3357 | } | |
3358 | ||
840cb59c | 3359 | health_code_update(); |
f37d259d | 3360 | if (count >= nbmem) { |
d7b3776f | 3361 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3362 | struct lttng_event_field *new_tmp_event; |
3363 | size_t new_nbmem; | |
3364 | ||
3365 | new_nbmem = nbmem << 1; | |
3366 | DBG2("Reallocating event field list from %zu to %zu entries", | |
3367 | nbmem, new_nbmem); | |
3368 | new_tmp_event = realloc(tmp_event, | |
3369 | new_nbmem * sizeof(struct lttng_event_field)); | |
3370 | if (new_tmp_event == NULL) { | |
f37d259d | 3371 | PERROR("realloc ust app event fields"); |
c617c0c6 | 3372 | free(tmp_event); |
f37d259d MD |
3373 | ret = -ENOMEM; |
3374 | goto rcu_error; | |
3375 | } | |
53efb85a MD |
3376 | /* Zero the new memory */ |
3377 | memset(new_tmp_event + nbmem, 0, | |
3378 | (new_nbmem - nbmem) * sizeof(struct lttng_event_field)); | |
3379 | nbmem = new_nbmem; | |
3380 | tmp_event = new_tmp_event; | |
f37d259d | 3381 | } |
f37d259d | 3382 | |
c617c0c6 | 3383 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
2e84128e DG |
3384 | /* Mapping between these enums matches 1 to 1. */ |
3385 | tmp_event[count].type = (enum lttng_event_field_type) uiter.type; | |
c617c0c6 | 3386 | tmp_event[count].nowrite = uiter.nowrite; |
f37d259d | 3387 | |
c617c0c6 MD |
3388 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
3389 | tmp_event[count].event.loglevel = uiter.loglevel; | |
2e84128e | 3390 | tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; |
c617c0c6 MD |
3391 | tmp_event[count].event.pid = app->pid; |
3392 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
3393 | count++; |
3394 | } | |
3395 | } | |
3396 | ||
3397 | ret = count; | |
c617c0c6 | 3398 | *fields = tmp_event; |
f37d259d MD |
3399 | |
3400 | DBG2("UST app list event fields done (%zu events)", count); | |
3401 | ||
3402 | rcu_error: | |
3403 | rcu_read_unlock(); | |
3404 | error: | |
840cb59c | 3405 | health_code_update(); |
f37d259d MD |
3406 | return ret; |
3407 | } | |
3408 | ||
5b4a0ec0 DG |
3409 | /* |
3410 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
3411 | * |
3412 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
3413 | */ |
3414 | void ust_app_clean_list(void) | |
421cb601 | 3415 | { |
5b4a0ec0 | 3416 | int ret; |
659ed79f | 3417 | struct ust_app *app; |
bec39940 | 3418 | struct lttng_ht_iter iter; |
421cb601 | 3419 | |
5b4a0ec0 | 3420 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3421 | |
5b4a0ec0 | 3422 | rcu_read_lock(); |
421cb601 | 3423 | |
f1b711c4 MD |
3424 | if (ust_app_ht) { |
3425 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3426 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3427 | assert(!ret); | |
3428 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
3429 | } | |
421cb601 DG |
3430 | } |
3431 | ||
852d0037 | 3432 | /* Cleanup socket hash table */ |
f1b711c4 MD |
3433 | if (ust_app_ht_by_sock) { |
3434 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, | |
3435 | sock_n.node) { | |
3436 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); | |
3437 | assert(!ret); | |
3438 | } | |
bec39940 | 3439 | } |
852d0037 | 3440 | |
d88aee68 | 3441 | /* Cleanup notify socket hash table */ |
f1b711c4 MD |
3442 | if (ust_app_ht_by_notify_sock) { |
3443 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3444 | notify_sock_n.node) { | |
3445 | ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3446 | assert(!ret); | |
3447 | } | |
d88aee68 | 3448 | } |
36b588ed | 3449 | rcu_read_unlock(); |
d88aee68 | 3450 | |
bec39940 | 3451 | /* Destroy is done only when the ht is empty */ |
f1b711c4 MD |
3452 | if (ust_app_ht) { |
3453 | ht_cleanup_push(ust_app_ht); | |
3454 | } | |
3455 | if (ust_app_ht_by_sock) { | |
3456 | ht_cleanup_push(ust_app_ht_by_sock); | |
3457 | } | |
3458 | if (ust_app_ht_by_notify_sock) { | |
3459 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
3460 | } | |
5b4a0ec0 DG |
3461 | } |
3462 | ||
3463 | /* | |
3464 | * Init UST app hash table. | |
3465 | */ | |
57703f6e | 3466 | int ust_app_ht_alloc(void) |
5b4a0ec0 | 3467 | { |
bec39940 | 3468 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3469 | if (!ust_app_ht) { |
3470 | return -1; | |
3471 | } | |
852d0037 | 3472 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3473 | if (!ust_app_ht_by_sock) { |
3474 | return -1; | |
3475 | } | |
d0b96690 | 3476 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3477 | if (!ust_app_ht_by_notify_sock) { |
3478 | return -1; | |
3479 | } | |
3480 | return 0; | |
421cb601 DG |
3481 | } |
3482 | ||
78f0bacd DG |
3483 | /* |
3484 | * For a specific UST session, disable the channel for all registered apps. | |
3485 | */ | |
35a9059d | 3486 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3487 | struct ltt_ust_channel *uchan) |
3488 | { | |
3489 | int ret = 0; | |
bec39940 DG |
3490 | struct lttng_ht_iter iter; |
3491 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3492 | struct ust_app *app; |
3493 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3494 | struct ust_app_channel *ua_chan; |
78f0bacd DG |
3495 | |
3496 | if (usess == NULL || uchan == NULL) { | |
3497 | ERR("Disabling UST global channel with NULL values"); | |
3498 | ret = -1; | |
3499 | goto error; | |
3500 | } | |
3501 | ||
d9bf3ca4 | 3502 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 3503 | uchan->name, usess->id); |
78f0bacd DG |
3504 | |
3505 | rcu_read_lock(); | |
3506 | ||
3507 | /* For every registered applications */ | |
852d0037 | 3508 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3509 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3510 | if (!app->compatible) { |
3511 | /* | |
3512 | * TODO: In time, we should notice the caller of this error by | |
3513 | * telling him that this is a version error. | |
3514 | */ | |
3515 | continue; | |
3516 | } | |
78f0bacd DG |
3517 | ua_sess = lookup_session_by_app(usess, app); |
3518 | if (ua_sess == NULL) { | |
3519 | continue; | |
3520 | } | |
3521 | ||
8535a6d9 | 3522 | /* Get channel */ |
bec39940 DG |
3523 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3524 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
3525 | /* If the session if found for the app, the channel must be there */ |
3526 | assert(ua_chan_node); | |
3527 | ||
3528 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3529 | /* The channel must not be already disabled */ | |
3530 | assert(ua_chan->enabled == 1); | |
3531 | ||
3532 | /* Disable channel onto application */ | |
3533 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
3534 | if (ret < 0) { |
3535 | /* XXX: We might want to report this error at some point... */ | |
3536 | continue; | |
3537 | } | |
3538 | } | |
3539 | ||
3540 | rcu_read_unlock(); | |
3541 | ||
3542 | error: | |
3543 | return ret; | |
3544 | } | |
3545 | ||
3546 | /* | |
3547 | * For a specific UST session, enable the channel for all registered apps. | |
3548 | */ | |
35a9059d | 3549 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3550 | struct ltt_ust_channel *uchan) |
3551 | { | |
3552 | int ret = 0; | |
bec39940 | 3553 | struct lttng_ht_iter iter; |
78f0bacd DG |
3554 | struct ust_app *app; |
3555 | struct ust_app_session *ua_sess; | |
3556 | ||
3557 | if (usess == NULL || uchan == NULL) { | |
3558 | ERR("Adding UST global channel to NULL values"); | |
3559 | ret = -1; | |
3560 | goto error; | |
3561 | } | |
3562 | ||
d9bf3ca4 | 3563 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 3564 | uchan->name, usess->id); |
78f0bacd DG |
3565 | |
3566 | rcu_read_lock(); | |
3567 | ||
3568 | /* For every registered applications */ | |
852d0037 | 3569 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3570 | if (!app->compatible) { |
3571 | /* | |
3572 | * TODO: In time, we should notice the caller of this error by | |
3573 | * telling him that this is a version error. | |
3574 | */ | |
3575 | continue; | |
3576 | } | |
78f0bacd DG |
3577 | ua_sess = lookup_session_by_app(usess, app); |
3578 | if (ua_sess == NULL) { | |
3579 | continue; | |
3580 | } | |
3581 | ||
3582 | /* Enable channel onto application */ | |
3583 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
3584 | if (ret < 0) { | |
3585 | /* XXX: We might want to report this error at some point... */ | |
3586 | continue; | |
3587 | } | |
3588 | } | |
3589 | ||
3590 | rcu_read_unlock(); | |
3591 | ||
3592 | error: | |
3593 | return ret; | |
3594 | } | |
3595 | ||
b0a40d28 DG |
3596 | /* |
3597 | * Disable an event in a channel and for a specific session. | |
3598 | */ | |
35a9059d DG |
3599 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
3600 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
3601 | { |
3602 | int ret = 0; | |
bec39940 DG |
3603 | struct lttng_ht_iter iter, uiter; |
3604 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
b0a40d28 DG |
3605 | struct ust_app *app; |
3606 | struct ust_app_session *ua_sess; | |
3607 | struct ust_app_channel *ua_chan; | |
3608 | struct ust_app_event *ua_event; | |
3609 | ||
3610 | DBG("UST app disabling event %s for all apps in channel " | |
d9bf3ca4 MD |
3611 | "%s for session id %" PRIu64, |
3612 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
3613 | |
3614 | rcu_read_lock(); | |
3615 | ||
3616 | /* For all registered applications */ | |
852d0037 | 3617 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3618 | if (!app->compatible) { |
3619 | /* | |
3620 | * TODO: In time, we should notice the caller of this error by | |
3621 | * telling him that this is a version error. | |
3622 | */ | |
3623 | continue; | |
3624 | } | |
b0a40d28 DG |
3625 | ua_sess = lookup_session_by_app(usess, app); |
3626 | if (ua_sess == NULL) { | |
3627 | /* Next app */ | |
3628 | continue; | |
3629 | } | |
3630 | ||
3631 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3632 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3633 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 3634 | if (ua_chan_node == NULL) { |
d9bf3ca4 | 3635 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 3636 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
3637 | continue; |
3638 | } | |
3639 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3640 | ||
bec39940 DG |
3641 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter); |
3642 | ua_event_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 DG |
3643 | if (ua_event_node == NULL) { |
3644 | DBG2("Event %s not found in channel %s for app pid %d." | |
852d0037 | 3645 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
3646 | continue; |
3647 | } | |
3648 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
3649 | ||
7f79d3a1 | 3650 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
3651 | if (ret < 0) { |
3652 | /* XXX: Report error someday... */ | |
3653 | continue; | |
3654 | } | |
3655 | } | |
3656 | ||
3657 | rcu_read_unlock(); | |
3658 | ||
3659 | return ret; | |
3660 | } | |
3661 | ||
421cb601 | 3662 | /* |
5b4a0ec0 | 3663 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 3664 | */ |
35a9059d | 3665 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3666 | struct ltt_ust_channel *uchan) |
3667 | { | |
3d8ca23b | 3668 | int ret = 0, created; |
bec39940 | 3669 | struct lttng_ht_iter iter; |
48842b30 | 3670 | struct ust_app *app; |
3d8ca23b | 3671 | struct ust_app_session *ua_sess = NULL; |
48842b30 | 3672 | |
fc34caaa DG |
3673 | /* Very wrong code flow */ |
3674 | assert(usess); | |
3675 | assert(uchan); | |
421cb601 | 3676 | |
d9bf3ca4 | 3677 | DBG2("UST app adding channel %s to UST domain for session id %" PRIu64, |
a991f516 | 3678 | uchan->name, usess->id); |
48842b30 DG |
3679 | |
3680 | rcu_read_lock(); | |
421cb601 | 3681 | |
5b4a0ec0 | 3682 | /* For every registered applications */ |
852d0037 | 3683 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3684 | if (!app->compatible) { |
3685 | /* | |
3686 | * TODO: In time, we should notice the caller of this error by | |
3687 | * telling him that this is a version error. | |
3688 | */ | |
3689 | continue; | |
3690 | } | |
edb67388 DG |
3691 | /* |
3692 | * Create session on the tracer side and add it to app session HT. Note | |
3693 | * that if session exist, it will simply return a pointer to the ust | |
3694 | * app session. | |
3695 | */ | |
3d8ca23b DG |
3696 | ret = create_ust_app_session(usess, app, &ua_sess, &created); |
3697 | if (ret < 0) { | |
3698 | switch (ret) { | |
3699 | case -ENOTCONN: | |
3700 | /* | |
3701 | * The application's socket is not valid. Either a bad socket | |
3702 | * or a timeout on it. We can't inform the caller that for a | |
3703 | * specific app, the session failed so lets continue here. | |
3704 | */ | |
3705 | continue; | |
3706 | case -ENOMEM: | |
3707 | default: | |
3708 | goto error_rcu_unlock; | |
3709 | } | |
48842b30 | 3710 | } |
3d8ca23b | 3711 | assert(ua_sess); |
48842b30 | 3712 | |
d0b96690 | 3713 | pthread_mutex_lock(&ua_sess->lock); |
d65d2de8 DG |
3714 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, |
3715 | sizeof(uchan->name))) { | |
ad7a9107 DG |
3716 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, &uchan->attr); |
3717 | ret = 0; | |
d65d2de8 DG |
3718 | } else { |
3719 | /* Create channel onto application. We don't need the chan ref. */ | |
3720 | ret = create_ust_app_channel(ua_sess, uchan, app, | |
3721 | LTTNG_UST_CHAN_PER_CPU, usess, NULL); | |
3722 | } | |
d0b96690 | 3723 | pthread_mutex_unlock(&ua_sess->lock); |
3d8ca23b DG |
3724 | if (ret < 0) { |
3725 | if (ret == -ENOMEM) { | |
3726 | /* No more memory is a fatal error. Stop right now. */ | |
3727 | goto error_rcu_unlock; | |
3728 | } | |
3729 | /* Cleanup the created session if it's the case. */ | |
3730 | if (created) { | |
d0b96690 | 3731 | destroy_app_session(app, ua_sess); |
3d8ca23b | 3732 | } |
48842b30 | 3733 | } |
48842b30 | 3734 | } |
5b4a0ec0 | 3735 | |
95e047ff | 3736 | error_rcu_unlock: |
48842b30 | 3737 | rcu_read_unlock(); |
3c14c33f | 3738 | return ret; |
48842b30 DG |
3739 | } |
3740 | ||
5b4a0ec0 | 3741 | /* |
edb67388 | 3742 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 3743 | */ |
35a9059d | 3744 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3745 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3746 | { | |
3747 | int ret = 0; | |
bec39940 | 3748 | struct lttng_ht_iter iter, uiter; |
18eace3b | 3749 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
3750 | struct ust_app *app; |
3751 | struct ust_app_session *ua_sess; | |
3752 | struct ust_app_channel *ua_chan; | |
3753 | struct ust_app_event *ua_event; | |
48842b30 | 3754 | |
d9bf3ca4 | 3755 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 3756 | uevent->attr.name, usess->id); |
48842b30 | 3757 | |
edb67388 DG |
3758 | /* |
3759 | * NOTE: At this point, this function is called only if the session and | |
3760 | * channel passed are already created for all apps. and enabled on the | |
3761 | * tracer also. | |
3762 | */ | |
3763 | ||
48842b30 | 3764 | rcu_read_lock(); |
421cb601 DG |
3765 | |
3766 | /* For all registered applications */ | |
852d0037 | 3767 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3768 | if (!app->compatible) { |
3769 | /* | |
3770 | * TODO: In time, we should notice the caller of this error by | |
3771 | * telling him that this is a version error. | |
3772 | */ | |
3773 | continue; | |
3774 | } | |
edb67388 | 3775 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3776 | if (!ua_sess) { |
3777 | /* The application has problem or is probably dead. */ | |
3778 | continue; | |
3779 | } | |
ba767faf | 3780 | |
d0b96690 DG |
3781 | pthread_mutex_lock(&ua_sess->lock); |
3782 | ||
edb67388 | 3783 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3784 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3785 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3786 | /* If the channel is not found, there is a code flow error */ |
3787 | assert(ua_chan_node); | |
3788 | ||
3789 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3790 | ||
18eace3b DG |
3791 | /* Get event node */ |
3792 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
39c5a3a7 | 3793 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 3794 | if (ua_event == NULL) { |
7f79d3a1 | 3795 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 3796 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 3797 | goto next_app; |
35a9059d | 3798 | } |
35a9059d DG |
3799 | |
3800 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
3801 | if (ret < 0) { | |
d0b96690 | 3802 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 3803 | goto error; |
48842b30 | 3804 | } |
d0b96690 DG |
3805 | next_app: |
3806 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
3807 | } |
3808 | ||
7f79d3a1 | 3809 | error: |
edb67388 | 3810 | rcu_read_unlock(); |
edb67388 DG |
3811 | return ret; |
3812 | } | |
3813 | ||
3814 | /* | |
3815 | * For a specific existing UST session and UST channel, creates the event for | |
3816 | * all registered apps. | |
3817 | */ | |
35a9059d | 3818 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
3819 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3820 | { | |
3821 | int ret = 0; | |
bec39940 DG |
3822 | struct lttng_ht_iter iter, uiter; |
3823 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
3824 | struct ust_app *app; |
3825 | struct ust_app_session *ua_sess; | |
3826 | struct ust_app_channel *ua_chan; | |
3827 | ||
d9bf3ca4 | 3828 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 3829 | uevent->attr.name, usess->id); |
edb67388 | 3830 | |
edb67388 DG |
3831 | rcu_read_lock(); |
3832 | ||
3833 | /* For all registered applications */ | |
852d0037 | 3834 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3835 | if (!app->compatible) { |
3836 | /* | |
3837 | * TODO: In time, we should notice the caller of this error by | |
3838 | * telling him that this is a version error. | |
3839 | */ | |
3840 | continue; | |
3841 | } | |
edb67388 | 3842 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3843 | if (!ua_sess) { |
3844 | /* The application has problem or is probably dead. */ | |
3845 | continue; | |
3846 | } | |
48842b30 | 3847 | |
d0b96690 | 3848 | pthread_mutex_lock(&ua_sess->lock); |
48842b30 | 3849 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3850 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3851 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3852 | /* If the channel is not found, there is a code flow error */ |
3853 | assert(ua_chan_node); | |
3854 | ||
48842b30 DG |
3855 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3856 | ||
edb67388 | 3857 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 3858 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 3859 | if (ret < 0) { |
49c336c1 | 3860 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
3861 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
3862 | break; | |
3863 | } | |
3864 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 3865 | uevent->attr.name, app->pid); |
5b4a0ec0 | 3866 | continue; |
48842b30 | 3867 | } |
48842b30 | 3868 | } |
5b4a0ec0 | 3869 | |
48842b30 DG |
3870 | rcu_read_unlock(); |
3871 | ||
3872 | return ret; | |
3873 | } | |
3874 | ||
5b4a0ec0 DG |
3875 | /* |
3876 | * Start tracing for a specific UST session and app. | |
3877 | */ | |
b34cbebf | 3878 | static |
421cb601 | 3879 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
3880 | { |
3881 | int ret = 0; | |
48842b30 | 3882 | struct ust_app_session *ua_sess; |
48842b30 | 3883 | |
852d0037 | 3884 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 3885 | |
509cbaf8 MD |
3886 | rcu_read_lock(); |
3887 | ||
e0c7ec2b DG |
3888 | if (!app->compatible) { |
3889 | goto end; | |
3890 | } | |
3891 | ||
421cb601 DG |
3892 | ua_sess = lookup_session_by_app(usess, app); |
3893 | if (ua_sess == NULL) { | |
d42f20df DG |
3894 | /* The session is in teardown process. Ignore and continue. */ |
3895 | goto end; | |
421cb601 | 3896 | } |
48842b30 | 3897 | |
d0b96690 DG |
3898 | pthread_mutex_lock(&ua_sess->lock); |
3899 | ||
aea829b3 DG |
3900 | /* Upon restart, we skip the setup, already done */ |
3901 | if (ua_sess->started) { | |
8be98f9a | 3902 | goto skip_setup; |
aea829b3 | 3903 | } |
8be98f9a | 3904 | |
a4b92340 DG |
3905 | /* Create directories if consumer is LOCAL and has a path defined. */ |
3906 | if (usess->consumer->type == CONSUMER_DST_LOCAL && | |
3907 | strlen(usess->consumer->dst.trace_path) > 0) { | |
3908 | ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path, | |
7972aab2 | 3909 | S_IRWXU | S_IRWXG, ua_sess->euid, ua_sess->egid); |
a4b92340 DG |
3910 | if (ret < 0) { |
3911 | if (ret != -EEXIST) { | |
3912 | ERR("Trace directory creation error"); | |
d0b96690 | 3913 | goto error_unlock; |
421cb601 | 3914 | } |
173af62f | 3915 | } |
7753dea8 | 3916 | } |
aea829b3 | 3917 | |
d65d2de8 DG |
3918 | /* |
3919 | * Create the metadata for the application. This returns gracefully if a | |
3920 | * metadata was already set for the session. | |
3921 | */ | |
ad7a9107 | 3922 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer); |
421cb601 | 3923 | if (ret < 0) { |
d0b96690 | 3924 | goto error_unlock; |
421cb601 | 3925 | } |
48842b30 | 3926 | |
840cb59c | 3927 | health_code_update(); |
86acf0da | 3928 | |
8be98f9a | 3929 | skip_setup: |
421cb601 | 3930 | /* This start the UST tracing */ |
852d0037 | 3931 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
421cb601 | 3932 | if (ret < 0) { |
ffe60014 DG |
3933 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3934 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
3935 | app->pid, ret); | |
3936 | } else { | |
3937 | DBG("UST app start session failed. Application is dead."); | |
3757b385 DG |
3938 | /* |
3939 | * This is normal behavior, an application can die during the | |
3940 | * creation process. Don't report an error so the execution can | |
3941 | * continue normally. | |
3942 | */ | |
3943 | pthread_mutex_unlock(&ua_sess->lock); | |
3944 | goto end; | |
ffe60014 | 3945 | } |
d0b96690 | 3946 | goto error_unlock; |
421cb601 | 3947 | } |
5b4a0ec0 | 3948 | |
55c3953d DG |
3949 | /* Indicate that the session has been started once */ |
3950 | ua_sess->started = 1; | |
3951 | ||
d0b96690 DG |
3952 | pthread_mutex_unlock(&ua_sess->lock); |
3953 | ||
840cb59c | 3954 | health_code_update(); |
86acf0da | 3955 | |
421cb601 | 3956 | /* Quiescent wait after starting trace */ |
ffe60014 DG |
3957 | ret = ustctl_wait_quiescent(app->sock); |
3958 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3959 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3960 | app->pid, ret); | |
3961 | } | |
48842b30 | 3962 | |
e0c7ec2b DG |
3963 | end: |
3964 | rcu_read_unlock(); | |
840cb59c | 3965 | health_code_update(); |
421cb601 | 3966 | return 0; |
48842b30 | 3967 | |
d0b96690 DG |
3968 | error_unlock: |
3969 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 3970 | rcu_read_unlock(); |
840cb59c | 3971 | health_code_update(); |
421cb601 DG |
3972 | return -1; |
3973 | } | |
48842b30 | 3974 | |
8be98f9a MD |
3975 | /* |
3976 | * Stop tracing for a specific UST session and app. | |
3977 | */ | |
b34cbebf | 3978 | static |
8be98f9a MD |
3979 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
3980 | { | |
3981 | int ret = 0; | |
3982 | struct ust_app_session *ua_sess; | |
7972aab2 | 3983 | struct ust_registry_session *registry; |
8be98f9a | 3984 | |
852d0037 | 3985 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
3986 | |
3987 | rcu_read_lock(); | |
3988 | ||
e0c7ec2b | 3989 | if (!app->compatible) { |
d88aee68 | 3990 | goto end_no_session; |
e0c7ec2b DG |
3991 | } |
3992 | ||
8be98f9a MD |
3993 | ua_sess = lookup_session_by_app(usess, app); |
3994 | if (ua_sess == NULL) { | |
d88aee68 | 3995 | goto end_no_session; |
8be98f9a MD |
3996 | } |
3997 | ||
d88aee68 DG |
3998 | pthread_mutex_lock(&ua_sess->lock); |
3999 | ||
9bc07046 DG |
4000 | /* |
4001 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
4002 | * that was never started. It's possible since we can have a fail start |
4003 | * from either the application manager thread or the command thread. Simply | |
4004 | * indicate that this is a stop error. | |
9bc07046 | 4005 | */ |
f9dfc3d9 | 4006 | if (!ua_sess->started) { |
c45536e1 DG |
4007 | goto error_rcu_unlock; |
4008 | } | |
7db205b5 | 4009 | |
840cb59c | 4010 | health_code_update(); |
86acf0da | 4011 | |
9d6c7d3f | 4012 | /* This inhibits UST tracing */ |
852d0037 | 4013 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
9d6c7d3f | 4014 | if (ret < 0) { |
ffe60014 DG |
4015 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4016 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
4017 | app->pid, ret); | |
4018 | } else { | |
4019 | DBG("UST app stop session failed. Application is dead."); | |
3757b385 DG |
4020 | /* |
4021 | * This is normal behavior, an application can die during the | |
4022 | * creation process. Don't report an error so the execution can | |
4023 | * continue normally. | |
4024 | */ | |
4025 | goto end_unlock; | |
ffe60014 | 4026 | } |
9d6c7d3f DG |
4027 | goto error_rcu_unlock; |
4028 | } | |
4029 | ||
840cb59c | 4030 | health_code_update(); |
86acf0da | 4031 | |
9d6c7d3f | 4032 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
4033 | ret = ustctl_wait_quiescent(app->sock); |
4034 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4035 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4036 | app->pid, ret); | |
4037 | } | |
9d6c7d3f | 4038 | |
840cb59c | 4039 | health_code_update(); |
86acf0da | 4040 | |
b34cbebf MD |
4041 | registry = get_session_registry(ua_sess); |
4042 | assert(registry); | |
1b532a60 | 4043 | |
ce34fcd0 MD |
4044 | /* Push metadata for application before freeing the application. */ |
4045 | (void) push_metadata(registry, ua_sess->consumer); | |
b34cbebf | 4046 | |
3757b385 | 4047 | end_unlock: |
b34cbebf MD |
4048 | pthread_mutex_unlock(&ua_sess->lock); |
4049 | end_no_session: | |
4050 | rcu_read_unlock(); | |
4051 | health_code_update(); | |
4052 | return 0; | |
4053 | ||
4054 | error_rcu_unlock: | |
4055 | pthread_mutex_unlock(&ua_sess->lock); | |
4056 | rcu_read_unlock(); | |
4057 | health_code_update(); | |
4058 | return -1; | |
4059 | } | |
4060 | ||
b34cbebf | 4061 | static |
c4b88406 MD |
4062 | int ust_app_flush_app_session(struct ust_app *app, |
4063 | struct ust_app_session *ua_sess) | |
b34cbebf | 4064 | { |
c4b88406 | 4065 | int ret, retval = 0; |
b34cbebf | 4066 | struct lttng_ht_iter iter; |
b34cbebf | 4067 | struct ust_app_channel *ua_chan; |
c4b88406 | 4068 | struct consumer_socket *socket; |
b34cbebf | 4069 | |
c4b88406 | 4070 | DBG("Flushing app session buffers for ust app pid %d", app->pid); |
b34cbebf MD |
4071 | |
4072 | rcu_read_lock(); | |
4073 | ||
4074 | if (!app->compatible) { | |
c4b88406 | 4075 | goto end_not_compatible; |
b34cbebf MD |
4076 | } |
4077 | ||
4078 | pthread_mutex_lock(&ua_sess->lock); | |
4079 | ||
4080 | health_code_update(); | |
4081 | ||
9d6c7d3f | 4082 | /* Flushing buffers */ |
c4b88406 MD |
4083 | socket = consumer_find_socket_by_bitness(app->bits_per_long, |
4084 | ua_sess->consumer); | |
ce34fcd0 MD |
4085 | |
4086 | /* Flush buffers and push metadata. */ | |
4087 | switch (ua_sess->buffer_type) { | |
4088 | case LTTNG_BUFFER_PER_PID: | |
4089 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, | |
4090 | node.node) { | |
4091 | health_code_update(); | |
4092 | assert(ua_chan->is_sent); | |
4093 | ret = consumer_flush_channel(socket, ua_chan->key); | |
4094 | if (ret) { | |
4095 | ERR("Error flushing consumer channel"); | |
4096 | retval = -1; | |
4097 | continue; | |
4098 | } | |
8be98f9a | 4099 | } |
ce34fcd0 MD |
4100 | break; |
4101 | case LTTNG_BUFFER_PER_UID: | |
4102 | default: | |
4103 | assert(0); | |
4104 | break; | |
8be98f9a | 4105 | } |
8be98f9a | 4106 | |
840cb59c | 4107 | health_code_update(); |
86acf0da | 4108 | |
d88aee68 | 4109 | pthread_mutex_unlock(&ua_sess->lock); |
ce34fcd0 | 4110 | |
c4b88406 MD |
4111 | end_not_compatible: |
4112 | rcu_read_unlock(); | |
4113 | health_code_update(); | |
4114 | return retval; | |
4115 | } | |
4116 | ||
4117 | /* | |
ce34fcd0 MD |
4118 | * Flush buffers for all applications for a specific UST session. |
4119 | * Called with UST session lock held. | |
c4b88406 MD |
4120 | */ |
4121 | static | |
ce34fcd0 | 4122 | int ust_app_flush_session(struct ltt_ust_session *usess) |
c4b88406 MD |
4123 | |
4124 | { | |
99b1411c | 4125 | int ret = 0; |
c4b88406 | 4126 | |
ce34fcd0 | 4127 | DBG("Flushing session buffers for all ust apps"); |
c4b88406 MD |
4128 | |
4129 | rcu_read_lock(); | |
4130 | ||
ce34fcd0 MD |
4131 | /* Flush buffers and push metadata. */ |
4132 | switch (usess->buffer_type) { | |
4133 | case LTTNG_BUFFER_PER_UID: | |
4134 | { | |
4135 | struct buffer_reg_uid *reg; | |
4136 | struct lttng_ht_iter iter; | |
4137 | ||
4138 | /* Flush all per UID buffers associated to that session. */ | |
4139 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
4140 | struct ust_registry_session *ust_session_reg; | |
4141 | struct buffer_reg_channel *reg_chan; | |
4142 | struct consumer_socket *socket; | |
4143 | ||
4144 | /* Get consumer socket to use to push the metadata.*/ | |
4145 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
4146 | usess->consumer); | |
4147 | if (!socket) { | |
4148 | /* Ignore request if no consumer is found for the session. */ | |
4149 | continue; | |
4150 | } | |
4151 | ||
4152 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
4153 | reg_chan, node.node) { | |
4154 | /* | |
4155 | * The following call will print error values so the return | |
4156 | * code is of little importance because whatever happens, we | |
4157 | * have to try them all. | |
4158 | */ | |
4159 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
4160 | } | |
4161 | ||
4162 | ust_session_reg = reg->registry->reg.ust; | |
4163 | /* Push metadata. */ | |
4164 | (void) push_metadata(ust_session_reg, usess->consumer); | |
4165 | } | |
ce34fcd0 MD |
4166 | break; |
4167 | } | |
4168 | case LTTNG_BUFFER_PER_PID: | |
4169 | { | |
4170 | struct ust_app_session *ua_sess; | |
4171 | struct lttng_ht_iter iter; | |
4172 | struct ust_app *app; | |
4173 | ||
4174 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4175 | ua_sess = lookup_session_by_app(usess, app); | |
4176 | if (ua_sess == NULL) { | |
4177 | continue; | |
4178 | } | |
4179 | (void) ust_app_flush_app_session(app, ua_sess); | |
4180 | } | |
4181 | break; | |
4182 | } | |
4183 | default: | |
99b1411c | 4184 | ret = -1; |
ce34fcd0 MD |
4185 | assert(0); |
4186 | break; | |
c4b88406 | 4187 | } |
c4b88406 | 4188 | |
d88aee68 | 4189 | end_no_session: |
7db205b5 | 4190 | rcu_read_unlock(); |
840cb59c | 4191 | health_code_update(); |
c4b88406 | 4192 | return ret; |
8be98f9a MD |
4193 | } |
4194 | ||
84cd17c6 MD |
4195 | /* |
4196 | * Destroy a specific UST session in apps. | |
4197 | */ | |
3353de95 | 4198 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 4199 | { |
ffe60014 | 4200 | int ret; |
84cd17c6 | 4201 | struct ust_app_session *ua_sess; |
bec39940 | 4202 | struct lttng_ht_iter iter; |
d9bf3ca4 | 4203 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 4204 | |
852d0037 | 4205 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
4206 | |
4207 | rcu_read_lock(); | |
4208 | ||
e0c7ec2b DG |
4209 | if (!app->compatible) { |
4210 | goto end; | |
4211 | } | |
4212 | ||
84cd17c6 | 4213 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 4214 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 4215 | if (node == NULL) { |
d42f20df DG |
4216 | /* Session is being or is deleted. */ |
4217 | goto end; | |
84cd17c6 MD |
4218 | } |
4219 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 4220 | |
840cb59c | 4221 | health_code_update(); |
d0b96690 | 4222 | destroy_app_session(app, ua_sess); |
84cd17c6 | 4223 | |
840cb59c | 4224 | health_code_update(); |
7db205b5 | 4225 | |
84cd17c6 | 4226 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
4227 | ret = ustctl_wait_quiescent(app->sock); |
4228 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4229 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4230 | app->pid, ret); | |
4231 | } | |
e0c7ec2b DG |
4232 | end: |
4233 | rcu_read_unlock(); | |
840cb59c | 4234 | health_code_update(); |
84cd17c6 | 4235 | return 0; |
84cd17c6 MD |
4236 | } |
4237 | ||
5b4a0ec0 DG |
4238 | /* |
4239 | * Start tracing for the UST session. | |
4240 | */ | |
421cb601 DG |
4241 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
4242 | { | |
4243 | int ret = 0; | |
bec39940 | 4244 | struct lttng_ht_iter iter; |
421cb601 | 4245 | struct ust_app *app; |
48842b30 | 4246 | |
421cb601 DG |
4247 | DBG("Starting all UST traces"); |
4248 | ||
4249 | rcu_read_lock(); | |
421cb601 | 4250 | |
852d0037 | 4251 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
421cb601 | 4252 | ret = ust_app_start_trace(usess, app); |
48842b30 | 4253 | if (ret < 0) { |
5b4a0ec0 DG |
4254 | /* Continue to next apps even on error */ |
4255 | continue; | |
48842b30 | 4256 | } |
48842b30 | 4257 | } |
5b4a0ec0 | 4258 | |
48842b30 DG |
4259 | rcu_read_unlock(); |
4260 | ||
4261 | return 0; | |
4262 | } | |
487cf67c | 4263 | |
8be98f9a MD |
4264 | /* |
4265 | * Start tracing for the UST session. | |
ce34fcd0 | 4266 | * Called with UST session lock held. |
8be98f9a MD |
4267 | */ |
4268 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
4269 | { | |
4270 | int ret = 0; | |
bec39940 | 4271 | struct lttng_ht_iter iter; |
8be98f9a MD |
4272 | struct ust_app *app; |
4273 | ||
4274 | DBG("Stopping all UST traces"); | |
4275 | ||
4276 | rcu_read_lock(); | |
4277 | ||
b34cbebf MD |
4278 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4279 | ret = ust_app_stop_trace(usess, app); | |
4280 | if (ret < 0) { | |
4281 | /* Continue to next apps even on error */ | |
4282 | continue; | |
4283 | } | |
4284 | } | |
4285 | ||
ce34fcd0 | 4286 | (void) ust_app_flush_session(usess); |
8be98f9a MD |
4287 | |
4288 | rcu_read_unlock(); | |
4289 | ||
4290 | return 0; | |
4291 | } | |
4292 | ||
84cd17c6 MD |
4293 | /* |
4294 | * Destroy app UST session. | |
4295 | */ | |
4296 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
4297 | { | |
4298 | int ret = 0; | |
bec39940 | 4299 | struct lttng_ht_iter iter; |
84cd17c6 MD |
4300 | struct ust_app *app; |
4301 | ||
4302 | DBG("Destroy all UST traces"); | |
4303 | ||
4304 | rcu_read_lock(); | |
4305 | ||
852d0037 | 4306 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 4307 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
4308 | if (ret < 0) { |
4309 | /* Continue to next apps even on error */ | |
4310 | continue; | |
4311 | } | |
4312 | } | |
4313 | ||
4314 | rcu_read_unlock(); | |
4315 | ||
4316 | return 0; | |
4317 | } | |
4318 | ||
5b4a0ec0 DG |
4319 | /* |
4320 | * Add channels/events from UST global domain to registered apps at sock. | |
4321 | */ | |
487cf67c DG |
4322 | void ust_app_global_update(struct ltt_ust_session *usess, int sock) |
4323 | { | |
55c54cce | 4324 | int ret = 0; |
31746f93 | 4325 | struct lttng_ht_iter iter, uiter; |
487cf67c | 4326 | struct ust_app *app; |
3d8ca23b | 4327 | struct ust_app_session *ua_sess = NULL; |
487cf67c DG |
4328 | struct ust_app_channel *ua_chan; |
4329 | struct ust_app_event *ua_event; | |
727d5404 | 4330 | struct ust_app_ctx *ua_ctx; |
1f3580c7 | 4331 | |
95e047ff | 4332 | assert(usess); |
ffe60014 | 4333 | assert(sock >= 0); |
1f3580c7 | 4334 | |
d9bf3ca4 | 4335 | DBG2("UST app global update for app sock %d for session id %" PRIu64, sock, |
a991f516 | 4336 | usess->id); |
487cf67c | 4337 | |
284d8f55 DG |
4338 | rcu_read_lock(); |
4339 | ||
f20baf8e | 4340 | app = ust_app_find_by_sock(sock); |
487cf67c | 4341 | if (app == NULL) { |
d88aee68 DG |
4342 | /* |
4343 | * Application can be unregistered before so this is possible hence | |
4344 | * simply stopping the update. | |
4345 | */ | |
4346 | DBG3("UST app update failed to find app sock %d", sock); | |
487cf67c DG |
4347 | goto error; |
4348 | } | |
4349 | ||
e0c7ec2b DG |
4350 | if (!app->compatible) { |
4351 | goto error; | |
4352 | } | |
4353 | ||
3d8ca23b DG |
4354 | ret = create_ust_app_session(usess, app, &ua_sess, NULL); |
4355 | if (ret < 0) { | |
4356 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
4357 | goto error; |
4358 | } | |
3d8ca23b | 4359 | assert(ua_sess); |
487cf67c | 4360 | |
d0b96690 DG |
4361 | pthread_mutex_lock(&ua_sess->lock); |
4362 | ||
284d8f55 | 4363 | /* |
d0b96690 | 4364 | * We can iterate safely here over all UST app session since the create ust |
284d8f55 DG |
4365 | * app session above made a shadow copy of the UST global domain from the |
4366 | * ltt ust session. | |
4367 | */ | |
bec39940 DG |
4368 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
4369 | node.node) { | |
ad7a9107 DG |
4370 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
4371 | if (ret < 0) { | |
4372 | /* | |
4373 | * Stop everything. On error, the application failed, no more | |
4374 | * file descriptor are available or ENOMEM so stopping here is | |
4375 | * the only thing we can do for now. | |
4376 | */ | |
4377 | goto error_unlock; | |
487cf67c DG |
4378 | } |
4379 | ||
31746f93 DG |
4380 | /* |
4381 | * Add context using the list so they are enabled in the same order the | |
4382 | * user added them. | |
4383 | */ | |
4384 | cds_list_for_each_entry(ua_ctx, &ua_chan->ctx_list, list) { | |
727d5404 DG |
4385 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); |
4386 | if (ret < 0) { | |
d0b96690 | 4387 | goto error_unlock; |
727d5404 DG |
4388 | } |
4389 | } | |
4390 | ||
4391 | ||
284d8f55 | 4392 | /* For each events */ |
bec39940 DG |
4393 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
4394 | node.node) { | |
284d8f55 DG |
4395 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
4396 | if (ret < 0) { | |
d0b96690 | 4397 | goto error_unlock; |
487cf67c | 4398 | } |
36dc12cc | 4399 | } |
487cf67c DG |
4400 | } |
4401 | ||
d0b96690 DG |
4402 | pthread_mutex_unlock(&ua_sess->lock); |
4403 | ||
14fb1ebe | 4404 | if (usess->active) { |
421cb601 | 4405 | ret = ust_app_start_trace(usess, app); |
36dc12cc | 4406 | if (ret < 0) { |
36dc12cc DG |
4407 | goto error; |
4408 | } | |
4409 | ||
852d0037 | 4410 | DBG2("UST trace started for app pid %d", app->pid); |
36dc12cc DG |
4411 | } |
4412 | ||
ffe60014 DG |
4413 | /* Everything went well at this point. */ |
4414 | rcu_read_unlock(); | |
4415 | return; | |
4416 | ||
d0b96690 DG |
4417 | error_unlock: |
4418 | pthread_mutex_unlock(&ua_sess->lock); | |
487cf67c | 4419 | error: |
ffe60014 | 4420 | if (ua_sess) { |
d0b96690 | 4421 | destroy_app_session(app, ua_sess); |
ffe60014 | 4422 | } |
487cf67c DG |
4423 | rcu_read_unlock(); |
4424 | return; | |
4425 | } | |
55cc08a6 DG |
4426 | |
4427 | /* | |
4428 | * Add context to a specific channel for global UST domain. | |
4429 | */ | |
4430 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
4431 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
4432 | { | |
4433 | int ret = 0; | |
bec39940 DG |
4434 | struct lttng_ht_node_str *ua_chan_node; |
4435 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
4436 | struct ust_app_channel *ua_chan = NULL; |
4437 | struct ust_app_session *ua_sess; | |
4438 | struct ust_app *app; | |
4439 | ||
4440 | rcu_read_lock(); | |
4441 | ||
852d0037 | 4442 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4443 | if (!app->compatible) { |
4444 | /* | |
4445 | * TODO: In time, we should notice the caller of this error by | |
4446 | * telling him that this is a version error. | |
4447 | */ | |
4448 | continue; | |
4449 | } | |
55cc08a6 DG |
4450 | ua_sess = lookup_session_by_app(usess, app); |
4451 | if (ua_sess == NULL) { | |
4452 | continue; | |
4453 | } | |
4454 | ||
d0b96690 | 4455 | pthread_mutex_lock(&ua_sess->lock); |
55cc08a6 | 4456 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4457 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4458 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 4459 | if (ua_chan_node == NULL) { |
d0b96690 | 4460 | goto next_app; |
55cc08a6 DG |
4461 | } |
4462 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
4463 | node); | |
55cc08a6 DG |
4464 | ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app); |
4465 | if (ret < 0) { | |
d0b96690 | 4466 | goto next_app; |
55cc08a6 | 4467 | } |
d0b96690 DG |
4468 | next_app: |
4469 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
4470 | } |
4471 | ||
55cc08a6 DG |
4472 | rcu_read_unlock(); |
4473 | return ret; | |
4474 | } | |
4475 | ||
76d45b40 DG |
4476 | /* |
4477 | * Enable event for a channel from a UST session for a specific PID. | |
4478 | */ | |
4479 | int ust_app_enable_event_pid(struct ltt_ust_session *usess, | |
4480 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4481 | { | |
4482 | int ret = 0; | |
bec39940 | 4483 | struct lttng_ht_iter iter; |
18eace3b | 4484 | struct lttng_ht_node_str *ua_chan_node; |
76d45b40 DG |
4485 | struct ust_app *app; |
4486 | struct ust_app_session *ua_sess; | |
4487 | struct ust_app_channel *ua_chan; | |
4488 | struct ust_app_event *ua_event; | |
4489 | ||
4490 | DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid); | |
4491 | ||
4492 | rcu_read_lock(); | |
4493 | ||
4494 | app = ust_app_find_by_pid(pid); | |
4495 | if (app == NULL) { | |
4496 | ERR("UST app enable event per PID %d not found", pid); | |
4497 | ret = -1; | |
d0b96690 | 4498 | goto end; |
76d45b40 DG |
4499 | } |
4500 | ||
e0c7ec2b DG |
4501 | if (!app->compatible) { |
4502 | ret = 0; | |
d0b96690 | 4503 | goto end; |
e0c7ec2b DG |
4504 | } |
4505 | ||
76d45b40 | 4506 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4507 | if (!ua_sess) { |
4508 | /* The application has problem or is probably dead. */ | |
d0b96690 DG |
4509 | ret = 0; |
4510 | goto end; | |
c4a1715b | 4511 | } |
76d45b40 | 4512 | |
d0b96690 | 4513 | pthread_mutex_lock(&ua_sess->lock); |
76d45b40 | 4514 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4515 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4516 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
76d45b40 DG |
4517 | /* If the channel is not found, there is a code flow error */ |
4518 | assert(ua_chan_node); | |
4519 | ||
4520 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4521 | ||
18eace3b | 4522 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 4523 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 4524 | if (ua_event == NULL) { |
76d45b40 DG |
4525 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
4526 | if (ret < 0) { | |
d0b96690 | 4527 | goto end_unlock; |
76d45b40 DG |
4528 | } |
4529 | } else { | |
76d45b40 DG |
4530 | ret = enable_ust_app_event(ua_sess, ua_event, app); |
4531 | if (ret < 0) { | |
d0b96690 | 4532 | goto end_unlock; |
76d45b40 DG |
4533 | } |
4534 | } | |
4535 | ||
d0b96690 DG |
4536 | end_unlock: |
4537 | pthread_mutex_unlock(&ua_sess->lock); | |
4538 | end: | |
76d45b40 DG |
4539 | rcu_read_unlock(); |
4540 | return ret; | |
4541 | } | |
7f79d3a1 | 4542 | |
4466912f DG |
4543 | /* |
4544 | * Calibrate registered applications. | |
4545 | */ | |
4546 | int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate) | |
4547 | { | |
4548 | int ret = 0; | |
4549 | struct lttng_ht_iter iter; | |
4550 | struct ust_app *app; | |
4551 | ||
4552 | rcu_read_lock(); | |
4553 | ||
852d0037 | 4554 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4466912f DG |
4555 | if (!app->compatible) { |
4556 | /* | |
4557 | * TODO: In time, we should notice the caller of this error by | |
4558 | * telling him that this is a version error. | |
4559 | */ | |
4560 | continue; | |
4561 | } | |
4562 | ||
840cb59c | 4563 | health_code_update(); |
86acf0da | 4564 | |
852d0037 | 4565 | ret = ustctl_calibrate(app->sock, calibrate); |
4466912f DG |
4566 | if (ret < 0) { |
4567 | switch (ret) { | |
4568 | case -ENOSYS: | |
4569 | /* Means that it's not implemented on the tracer side. */ | |
4570 | ret = 0; | |
4571 | break; | |
4572 | default: | |
4466912f | 4573 | DBG2("Calibrate app PID %d returned with error %d", |
852d0037 | 4574 | app->pid, ret); |
4466912f DG |
4575 | break; |
4576 | } | |
4577 | } | |
4578 | } | |
4579 | ||
4580 | DBG("UST app global domain calibration finished"); | |
4581 | ||
4582 | rcu_read_unlock(); | |
4583 | ||
840cb59c | 4584 | health_code_update(); |
86acf0da | 4585 | |
4466912f DG |
4586 | return ret; |
4587 | } | |
d0b96690 DG |
4588 | |
4589 | /* | |
4590 | * Receive registration and populate the given msg structure. | |
4591 | * | |
4592 | * On success return 0 else a negative value returned by the ustctl call. | |
4593 | */ | |
4594 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
4595 | { | |
4596 | int ret; | |
4597 | uint32_t pid, ppid, uid, gid; | |
4598 | ||
4599 | assert(msg); | |
4600 | ||
4601 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
4602 | &pid, &ppid, &uid, &gid, | |
4603 | &msg->bits_per_long, | |
4604 | &msg->uint8_t_alignment, | |
4605 | &msg->uint16_t_alignment, | |
4606 | &msg->uint32_t_alignment, | |
4607 | &msg->uint64_t_alignment, | |
4608 | &msg->long_alignment, | |
4609 | &msg->byte_order, | |
4610 | msg->name); | |
4611 | if (ret < 0) { | |
4612 | switch (-ret) { | |
4613 | case EPIPE: | |
4614 | case ECONNRESET: | |
4615 | case LTTNG_UST_ERR_EXITING: | |
4616 | DBG3("UST app recv reg message failed. Application died"); | |
4617 | break; | |
4618 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
4619 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
4620 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
4621 | LTTNG_UST_ABI_MINOR_VERSION); | |
4622 | break; | |
4623 | default: | |
4624 | ERR("UST app recv reg message failed with ret %d", ret); | |
4625 | break; | |
4626 | } | |
4627 | goto error; | |
4628 | } | |
4629 | msg->pid = (pid_t) pid; | |
4630 | msg->ppid = (pid_t) ppid; | |
4631 | msg->uid = (uid_t) uid; | |
4632 | msg->gid = (gid_t) gid; | |
4633 | ||
4634 | error: | |
4635 | return ret; | |
4636 | } | |
4637 | ||
d88aee68 DG |
4638 | /* |
4639 | * Return a ust app channel object using the application object and the channel | |
4640 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
4641 | * lock MUST be acquired before calling this function. | |
4642 | */ | |
d0b96690 DG |
4643 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
4644 | int objd) | |
4645 | { | |
4646 | struct lttng_ht_node_ulong *node; | |
4647 | struct lttng_ht_iter iter; | |
4648 | struct ust_app_channel *ua_chan = NULL; | |
4649 | ||
4650 | assert(app); | |
4651 | ||
4652 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
4653 | node = lttng_ht_iter_get_node_ulong(&iter); | |
4654 | if (node == NULL) { | |
4655 | DBG2("UST app channel find by objd %d not found", objd); | |
4656 | goto error; | |
4657 | } | |
4658 | ||
4659 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
4660 | ||
4661 | error: | |
4662 | return ua_chan; | |
4663 | } | |
4664 | ||
d88aee68 DG |
4665 | /* |
4666 | * Reply to a register channel notification from an application on the notify | |
4667 | * socket. The channel metadata is also created. | |
4668 | * | |
4669 | * The session UST registry lock is acquired in this function. | |
4670 | * | |
4671 | * On success 0 is returned else a negative value. | |
4672 | */ | |
d0b96690 DG |
4673 | static int reply_ust_register_channel(int sock, int sobjd, int cobjd, |
4674 | size_t nr_fields, struct ustctl_field *fields) | |
4675 | { | |
4676 | int ret, ret_code = 0; | |
4677 | uint32_t chan_id, reg_count; | |
7972aab2 | 4678 | uint64_t chan_reg_key; |
d0b96690 DG |
4679 | enum ustctl_channel_header type; |
4680 | struct ust_app *app; | |
4681 | struct ust_app_channel *ua_chan; | |
4682 | struct ust_app_session *ua_sess; | |
7972aab2 | 4683 | struct ust_registry_session *registry; |
45893984 | 4684 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
4685 | |
4686 | rcu_read_lock(); | |
4687 | ||
4688 | /* Lookup application. If not found, there is a code flow error. */ | |
4689 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4690 | if (!app) { |
4691 | DBG("Application socket %d is being teardown. Abort event notify", | |
4692 | sock); | |
4693 | ret = 0; | |
d5d629b5 | 4694 | free(fields); |
d88aee68 DG |
4695 | goto error_rcu_unlock; |
4696 | } | |
d0b96690 | 4697 | |
4950b860 | 4698 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4699 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4700 | if (!ua_chan) { |
4701 | DBG("Application channel is being teardown. Abort event notify"); | |
4702 | ret = 0; | |
d5d629b5 | 4703 | free(fields); |
4950b860 MD |
4704 | goto error_rcu_unlock; |
4705 | } | |
4706 | ||
d0b96690 DG |
4707 | assert(ua_chan->session); |
4708 | ua_sess = ua_chan->session; | |
d0b96690 | 4709 | |
7972aab2 DG |
4710 | /* Get right session registry depending on the session buffer type. */ |
4711 | registry = get_session_registry(ua_sess); | |
4712 | assert(registry); | |
45893984 | 4713 | |
7972aab2 DG |
4714 | /* Depending on the buffer type, a different channel key is used. */ |
4715 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4716 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 4717 | } else { |
7972aab2 | 4718 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
4719 | } |
4720 | ||
7972aab2 DG |
4721 | pthread_mutex_lock(®istry->lock); |
4722 | ||
4723 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
4724 | assert(chan_reg); | |
4725 | ||
4726 | if (!chan_reg->register_done) { | |
4727 | reg_count = ust_registry_get_event_count(chan_reg); | |
4728 | if (reg_count < 31) { | |
4729 | type = USTCTL_CHANNEL_HEADER_COMPACT; | |
4730 | } else { | |
4731 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
4732 | } | |
4733 | ||
4734 | chan_reg->nr_ctx_fields = nr_fields; | |
4735 | chan_reg->ctx_fields = fields; | |
4736 | chan_reg->header_type = type; | |
d0b96690 | 4737 | } else { |
7972aab2 DG |
4738 | /* Get current already assigned values. */ |
4739 | type = chan_reg->header_type; | |
d5d629b5 DG |
4740 | free(fields); |
4741 | /* Set to NULL so the error path does not do a double free. */ | |
4742 | fields = NULL; | |
d0b96690 | 4743 | } |
7972aab2 DG |
4744 | /* Channel id is set during the object creation. */ |
4745 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
4746 | |
4747 | /* Append to metadata */ | |
7972aab2 DG |
4748 | if (!chan_reg->metadata_dumped) { |
4749 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
4750 | if (ret_code) { |
4751 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
4752 | goto reply; | |
4753 | } | |
4754 | } | |
4755 | ||
4756 | reply: | |
7972aab2 DG |
4757 | DBG3("UST app replying to register channel key %" PRIu64 |
4758 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
4759 | ret_code); | |
d0b96690 DG |
4760 | |
4761 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
4762 | if (ret < 0) { | |
4763 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4764 | ERR("UST app reply channel failed with ret %d", ret); | |
4765 | } else { | |
4766 | DBG3("UST app reply channel failed. Application died"); | |
4767 | } | |
4768 | goto error; | |
4769 | } | |
4770 | ||
7972aab2 DG |
4771 | /* This channel registry registration is completed. */ |
4772 | chan_reg->register_done = 1; | |
4773 | ||
d0b96690 | 4774 | error: |
7972aab2 | 4775 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4776 | error_rcu_unlock: |
d0b96690 | 4777 | rcu_read_unlock(); |
d5d629b5 DG |
4778 | if (ret) { |
4779 | free(fields); | |
4780 | } | |
d0b96690 DG |
4781 | return ret; |
4782 | } | |
4783 | ||
d88aee68 DG |
4784 | /* |
4785 | * Add event to the UST channel registry. When the event is added to the | |
4786 | * registry, the metadata is also created. Once done, this replies to the | |
4787 | * application with the appropriate error code. | |
4788 | * | |
4789 | * The session UST registry lock is acquired in the function. | |
4790 | * | |
4791 | * On success 0 is returned else a negative value. | |
4792 | */ | |
d0b96690 DG |
4793 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
4794 | char *sig, size_t nr_fields, struct ustctl_field *fields, int loglevel, | |
4795 | char *model_emf_uri) | |
4796 | { | |
4797 | int ret, ret_code; | |
4798 | uint32_t event_id = 0; | |
7972aab2 | 4799 | uint64_t chan_reg_key; |
d0b96690 DG |
4800 | struct ust_app *app; |
4801 | struct ust_app_channel *ua_chan; | |
4802 | struct ust_app_session *ua_sess; | |
7972aab2 | 4803 | struct ust_registry_session *registry; |
d0b96690 DG |
4804 | |
4805 | rcu_read_lock(); | |
4806 | ||
4807 | /* Lookup application. If not found, there is a code flow error. */ | |
4808 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4809 | if (!app) { |
4810 | DBG("Application socket %d is being teardown. Abort event notify", | |
4811 | sock); | |
4812 | ret = 0; | |
d5d629b5 DG |
4813 | free(sig); |
4814 | free(fields); | |
4815 | free(model_emf_uri); | |
d88aee68 DG |
4816 | goto error_rcu_unlock; |
4817 | } | |
d0b96690 | 4818 | |
4950b860 | 4819 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4820 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4821 | if (!ua_chan) { |
4822 | DBG("Application channel is being teardown. Abort event notify"); | |
4823 | ret = 0; | |
d5d629b5 DG |
4824 | free(sig); |
4825 | free(fields); | |
4826 | free(model_emf_uri); | |
4950b860 MD |
4827 | goto error_rcu_unlock; |
4828 | } | |
4829 | ||
d0b96690 DG |
4830 | assert(ua_chan->session); |
4831 | ua_sess = ua_chan->session; | |
4832 | ||
7972aab2 DG |
4833 | registry = get_session_registry(ua_sess); |
4834 | assert(registry); | |
4835 | ||
4836 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4837 | chan_reg_key = ua_chan->tracing_channel_id; | |
4838 | } else { | |
4839 | chan_reg_key = ua_chan->key; | |
4840 | } | |
4841 | ||
4842 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 4843 | |
d5d629b5 DG |
4844 | /* |
4845 | * From this point on, this call acquires the ownership of the sig, fields | |
4846 | * and model_emf_uri meaning any free are done inside it if needed. These | |
4847 | * three variables MUST NOT be read/write after this. | |
4848 | */ | |
7972aab2 | 4849 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
45893984 | 4850 | sobjd, cobjd, name, sig, nr_fields, fields, loglevel, |
8494bda5 MD |
4851 | model_emf_uri, ua_sess->buffer_type, &event_id, |
4852 | app); | |
d0b96690 DG |
4853 | |
4854 | /* | |
4855 | * The return value is returned to ustctl so in case of an error, the | |
4856 | * application can be notified. In case of an error, it's important not to | |
4857 | * return a negative error or else the application will get closed. | |
4858 | */ | |
4859 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
4860 | if (ret < 0) { | |
4861 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4862 | ERR("UST app reply event failed with ret %d", ret); | |
4863 | } else { | |
4864 | DBG3("UST app reply event failed. Application died"); | |
4865 | } | |
4866 | /* | |
4867 | * No need to wipe the create event since the application socket will | |
4868 | * get close on error hence cleaning up everything by itself. | |
4869 | */ | |
4870 | goto error; | |
4871 | } | |
4872 | ||
7972aab2 DG |
4873 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
4874 | name, event_id); | |
d88aee68 | 4875 | |
d0b96690 | 4876 | error: |
7972aab2 | 4877 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4878 | error_rcu_unlock: |
d0b96690 DG |
4879 | rcu_read_unlock(); |
4880 | return ret; | |
4881 | } | |
4882 | ||
d88aee68 DG |
4883 | /* |
4884 | * Handle application notification through the given notify socket. | |
4885 | * | |
4886 | * Return 0 on success or else a negative value. | |
4887 | */ | |
d0b96690 DG |
4888 | int ust_app_recv_notify(int sock) |
4889 | { | |
4890 | int ret; | |
4891 | enum ustctl_notify_cmd cmd; | |
4892 | ||
4893 | DBG3("UST app receiving notify from sock %d", sock); | |
4894 | ||
4895 | ret = ustctl_recv_notify(sock, &cmd); | |
4896 | if (ret < 0) { | |
4897 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4898 | ERR("UST app recv notify failed with ret %d", ret); | |
4899 | } else { | |
4900 | DBG3("UST app recv notify failed. Application died"); | |
4901 | } | |
4902 | goto error; | |
4903 | } | |
4904 | ||
4905 | switch (cmd) { | |
4906 | case USTCTL_NOTIFY_CMD_EVENT: | |
4907 | { | |
4908 | int sobjd, cobjd, loglevel; | |
4909 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; | |
4910 | size_t nr_fields; | |
4911 | struct ustctl_field *fields; | |
4912 | ||
4913 | DBG2("UST app ustctl register event received"); | |
4914 | ||
4915 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, &loglevel, | |
4916 | &sig, &nr_fields, &fields, &model_emf_uri); | |
4917 | if (ret < 0) { | |
4918 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4919 | ERR("UST app recv event failed with ret %d", ret); | |
4920 | } else { | |
4921 | DBG3("UST app recv event failed. Application died"); | |
4922 | } | |
4923 | goto error; | |
4924 | } | |
4925 | ||
d5d629b5 DG |
4926 | /* |
4927 | * Add event to the UST registry coming from the notify socket. This | |
4928 | * call will free if needed the sig, fields and model_emf_uri. This | |
4929 | * code path loses the ownsership of these variables and transfer them | |
4930 | * to the this function. | |
4931 | */ | |
d0b96690 DG |
4932 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
4933 | fields, loglevel, model_emf_uri); | |
4934 | if (ret < 0) { | |
4935 | goto error; | |
4936 | } | |
4937 | ||
4938 | break; | |
4939 | } | |
4940 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
4941 | { | |
4942 | int sobjd, cobjd; | |
4943 | size_t nr_fields; | |
4944 | struct ustctl_field *fields; | |
4945 | ||
4946 | DBG2("UST app ustctl register channel received"); | |
4947 | ||
4948 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
4949 | &fields); | |
4950 | if (ret < 0) { | |
4951 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4952 | ERR("UST app recv channel failed with ret %d", ret); | |
4953 | } else { | |
4954 | DBG3("UST app recv channel failed. Application died"); | |
4955 | } | |
4956 | goto error; | |
4957 | } | |
4958 | ||
d5d629b5 DG |
4959 | /* |
4960 | * The fields ownership are transfered to this function call meaning | |
4961 | * that if needed it will be freed. After this, it's invalid to access | |
4962 | * fields or clean it up. | |
4963 | */ | |
d0b96690 DG |
4964 | ret = reply_ust_register_channel(sock, sobjd, cobjd, nr_fields, |
4965 | fields); | |
4966 | if (ret < 0) { | |
4967 | goto error; | |
4968 | } | |
4969 | ||
4970 | break; | |
4971 | } | |
4972 | default: | |
4973 | /* Should NEVER happen. */ | |
4974 | assert(0); | |
4975 | } | |
4976 | ||
4977 | error: | |
4978 | return ret; | |
4979 | } | |
d88aee68 DG |
4980 | |
4981 | /* | |
4982 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
4983 | * corresponding application. On failure, the call_rcu to close the socket is | |
4984 | * executed. If an application is found, it tries to delete it from the notify | |
4985 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
4986 | * | |
4987 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
4988 | * call RCU is not done but the rest of the cleanup is. | |
4989 | */ | |
4990 | void ust_app_notify_sock_unregister(int sock) | |
4991 | { | |
4992 | int err_enomem = 0; | |
4993 | struct lttng_ht_iter iter; | |
4994 | struct ust_app *app; | |
4995 | struct ust_app_notify_sock_obj *obj; | |
4996 | ||
4997 | assert(sock >= 0); | |
4998 | ||
4999 | rcu_read_lock(); | |
5000 | ||
5001 | obj = zmalloc(sizeof(*obj)); | |
5002 | if (!obj) { | |
5003 | /* | |
5004 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
5005 | * procedure but the call_rcu will not be called. In this case, we | |
5006 | * accept the fd leak rather than possibly creating an unsynchronized | |
5007 | * state between threads. | |
5008 | * | |
5009 | * TODO: The notify object should be created once the notify socket is | |
5010 | * registered and stored independantely from the ust app object. The | |
5011 | * tricky part is to synchronize the teardown of the application and | |
5012 | * this notify object. Let's keep that in mind so we can avoid this | |
5013 | * kind of shenanigans with ENOMEM in the teardown path. | |
5014 | */ | |
5015 | err_enomem = 1; | |
5016 | } else { | |
5017 | obj->fd = sock; | |
5018 | } | |
5019 | ||
5020 | DBG("UST app notify socket unregister %d", sock); | |
5021 | ||
5022 | /* | |
5023 | * Lookup application by notify socket. If this fails, this means that the | |
5024 | * hash table delete has already been done by the application | |
5025 | * unregistration process so we can safely close the notify socket in a | |
5026 | * call RCU. | |
5027 | */ | |
5028 | app = find_app_by_notify_sock(sock); | |
5029 | if (!app) { | |
5030 | goto close_socket; | |
5031 | } | |
5032 | ||
5033 | iter.iter.node = &app->notify_sock_n.node; | |
5034 | ||
5035 | /* | |
5036 | * Whatever happens here either we fail or succeed, in both cases we have | |
5037 | * to close the socket after a grace period to continue to the call RCU | |
5038 | * here. If the deletion is successful, the application is not visible | |
5039 | * anymore by other threads and is it fails it means that it was already | |
5040 | * deleted from the hash table so either way we just have to close the | |
5041 | * socket. | |
5042 | */ | |
5043 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
5044 | ||
5045 | close_socket: | |
5046 | rcu_read_unlock(); | |
5047 | ||
5048 | /* | |
5049 | * Close socket after a grace period to avoid for the socket to be reused | |
5050 | * before the application object is freed creating potential race between | |
5051 | * threads trying to add unique in the global hash table. | |
5052 | */ | |
5053 | if (!err_enomem) { | |
5054 | call_rcu(&obj->head, close_notify_sock_rcu); | |
5055 | } | |
5056 | } | |
f45e313d DG |
5057 | |
5058 | /* | |
5059 | * Destroy a ust app data structure and free its memory. | |
5060 | */ | |
5061 | void ust_app_destroy(struct ust_app *app) | |
5062 | { | |
5063 | if (!app) { | |
5064 | return; | |
5065 | } | |
5066 | ||
5067 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
5068 | } | |
6dc3064a DG |
5069 | |
5070 | /* | |
5071 | * Take a snapshot for a given UST session. The snapshot is sent to the given | |
5072 | * output. | |
5073 | * | |
5074 | * Return 0 on success or else a negative value. | |
5075 | */ | |
5076 | int ust_app_snapshot_record(struct ltt_ust_session *usess, | |
d07ceecd MD |
5077 | struct snapshot_output *output, int wait, |
5078 | uint64_t nb_packets_per_stream) | |
6dc3064a DG |
5079 | { |
5080 | int ret = 0; | |
7badf927 | 5081 | unsigned int snapshot_done = 0; |
6dc3064a DG |
5082 | struct lttng_ht_iter iter; |
5083 | struct ust_app *app; | |
af706bb7 | 5084 | char pathname[PATH_MAX]; |
6dc3064a DG |
5085 | |
5086 | assert(usess); | |
5087 | assert(output); | |
5088 | ||
5089 | rcu_read_lock(); | |
5090 | ||
8c924c7b MD |
5091 | switch (usess->buffer_type) { |
5092 | case LTTNG_BUFFER_PER_UID: | |
5093 | { | |
5094 | struct buffer_reg_uid *reg; | |
6dc3064a | 5095 | |
8c924c7b MD |
5096 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
5097 | struct buffer_reg_channel *reg_chan; | |
5098 | struct consumer_socket *socket; | |
6dc3064a | 5099 | |
8c924c7b MD |
5100 | /* Get consumer socket to use to push the metadata.*/ |
5101 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
5102 | usess->consumer); | |
5103 | if (!socket) { | |
5104 | ret = -EINVAL; | |
5105 | goto error; | |
5106 | } | |
6dc3064a | 5107 | |
8c924c7b MD |
5108 | memset(pathname, 0, sizeof(pathname)); |
5109 | ret = snprintf(pathname, sizeof(pathname), | |
5110 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH, | |
5111 | reg->uid, reg->bits_per_long); | |
5112 | if (ret < 0) { | |
5113 | PERROR("snprintf snapshot path"); | |
5114 | goto error; | |
5115 | } | |
5116 | ||
5117 | /* Add the UST default trace dir to path. */ | |
5118 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
5119 | reg_chan, node.node) { | |
68808f4e DG |
5120 | ret = consumer_snapshot_channel(socket, reg_chan->consumer_key, |
5121 | output, 0, usess->uid, usess->gid, pathname, wait, | |
d07ceecd | 5122 | nb_packets_per_stream); |
8c924c7b MD |
5123 | if (ret < 0) { |
5124 | goto error; | |
5125 | } | |
5126 | } | |
68808f4e DG |
5127 | ret = consumer_snapshot_channel(socket, |
5128 | reg->registry->reg.ust->metadata_key, output, 1, | |
d07ceecd | 5129 | usess->uid, usess->gid, pathname, wait, 0); |
8c924c7b MD |
5130 | if (ret < 0) { |
5131 | goto error; | |
5132 | } | |
7badf927 | 5133 | snapshot_done = 1; |
af706bb7 | 5134 | } |
8c924c7b MD |
5135 | break; |
5136 | } | |
5137 | case LTTNG_BUFFER_PER_PID: | |
5138 | { | |
5139 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5140 | struct consumer_socket *socket; | |
5141 | struct lttng_ht_iter chan_iter; | |
5142 | struct ust_app_channel *ua_chan; | |
5143 | struct ust_app_session *ua_sess; | |
5144 | struct ust_registry_session *registry; | |
5145 | ||
5146 | ua_sess = lookup_session_by_app(usess, app); | |
5147 | if (!ua_sess) { | |
5148 | /* Session not associated with this app. */ | |
5149 | continue; | |
5150 | } | |
af706bb7 | 5151 | |
8c924c7b MD |
5152 | /* Get the right consumer socket for the application. */ |
5153 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
5154 | output->consumer); | |
5155 | if (!socket) { | |
5c786ded | 5156 | ret = -EINVAL; |
5c786ded JD |
5157 | goto error; |
5158 | } | |
5159 | ||
8c924c7b MD |
5160 | /* Add the UST default trace dir to path. */ |
5161 | memset(pathname, 0, sizeof(pathname)); | |
5162 | ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "/%s", | |
5163 | ua_sess->path); | |
6dc3064a | 5164 | if (ret < 0) { |
8c924c7b | 5165 | PERROR("snprintf snapshot path"); |
6dc3064a DG |
5166 | goto error; |
5167 | } | |
6dc3064a | 5168 | |
8c924c7b MD |
5169 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, |
5170 | ua_chan, node.node) { | |
68808f4e DG |
5171 | ret = consumer_snapshot_channel(socket, ua_chan->key, output, |
5172 | 0, ua_sess->euid, ua_sess->egid, pathname, wait, | |
d07ceecd | 5173 | nb_packets_per_stream); |
8c924c7b MD |
5174 | if (ret < 0) { |
5175 | goto error; | |
5176 | } | |
5177 | } | |
5178 | ||
5179 | registry = get_session_registry(ua_sess); | |
5180 | assert(registry); | |
5181 | ret = consumer_snapshot_channel(socket, registry->metadata_key, output, | |
d07ceecd | 5182 | 1, ua_sess->euid, ua_sess->egid, pathname, wait, 0); |
8c924c7b MD |
5183 | if (ret < 0) { |
5184 | goto error; | |
5185 | } | |
7badf927 | 5186 | snapshot_done = 1; |
8c924c7b MD |
5187 | } |
5188 | break; | |
5189 | } | |
5190 | default: | |
5191 | assert(0); | |
5192 | break; | |
6dc3064a DG |
5193 | } |
5194 | ||
7badf927 DG |
5195 | if (!snapshot_done) { |
5196 | /* | |
5197 | * If no snapshot was made and we are not in the error path, this means | |
5198 | * that there are no buffers thus no (prior) application to snapshot | |
5199 | * data from so we have simply NO data. | |
5200 | */ | |
5201 | ret = -ENODATA; | |
5202 | } | |
5203 | ||
6dc3064a DG |
5204 | error: |
5205 | rcu_read_unlock(); | |
5206 | return ret; | |
5207 | } | |
5c786ded JD |
5208 | |
5209 | /* | |
d07ceecd | 5210 | * Return the size taken by one more packet per stream. |
5c786ded | 5211 | */ |
d07ceecd MD |
5212 | uint64_t ust_app_get_size_one_more_packet_per_stream(struct ltt_ust_session *usess, |
5213 | uint64_t cur_nr_packets) | |
5c786ded | 5214 | { |
d07ceecd | 5215 | uint64_t tot_size = 0; |
5c786ded JD |
5216 | struct ust_app *app; |
5217 | struct lttng_ht_iter iter; | |
5218 | ||
5219 | assert(usess); | |
5220 | ||
5221 | switch (usess->buffer_type) { | |
5222 | case LTTNG_BUFFER_PER_UID: | |
5223 | { | |
5224 | struct buffer_reg_uid *reg; | |
5225 | ||
5226 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
5227 | struct buffer_reg_channel *reg_chan; | |
5228 | ||
b7064eaa | 5229 | rcu_read_lock(); |
5c786ded JD |
5230 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
5231 | reg_chan, node.node) { | |
d07ceecd MD |
5232 | if (cur_nr_packets >= reg_chan->num_subbuf) { |
5233 | /* | |
5234 | * Don't take channel into account if we | |
5235 | * already grab all its packets. | |
5236 | */ | |
5237 | continue; | |
5238 | } | |
5239 | tot_size += reg_chan->subbuf_size * reg_chan->stream_count; | |
5c786ded | 5240 | } |
b7064eaa | 5241 | rcu_read_unlock(); |
5c786ded JD |
5242 | } |
5243 | break; | |
5244 | } | |
5245 | case LTTNG_BUFFER_PER_PID: | |
5246 | { | |
5247 | rcu_read_lock(); | |
5248 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5249 | struct ust_app_channel *ua_chan; | |
5250 | struct ust_app_session *ua_sess; | |
5251 | struct lttng_ht_iter chan_iter; | |
5252 | ||
5253 | ua_sess = lookup_session_by_app(usess, app); | |
5254 | if (!ua_sess) { | |
5255 | /* Session not associated with this app. */ | |
5256 | continue; | |
5257 | } | |
5258 | ||
5259 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
5260 | ua_chan, node.node) { | |
d07ceecd MD |
5261 | if (cur_nr_packets >= ua_chan->attr.num_subbuf) { |
5262 | /* | |
5263 | * Don't take channel into account if we | |
5264 | * already grab all its packets. | |
5265 | */ | |
5266 | continue; | |
5267 | } | |
5268 | tot_size += ua_chan->attr.subbuf_size * ua_chan->streams.count; | |
5c786ded JD |
5269 | } |
5270 | } | |
5271 | rcu_read_unlock(); | |
5272 | break; | |
5273 | } | |
5274 | default: | |
5275 | assert(0); | |
5276 | break; | |
5277 | } | |
5278 | ||
d07ceecd | 5279 | return tot_size; |
5c786ded | 5280 | } |