Commit | Line | Data |
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91d76f53 DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * | |
d14d33bf AM |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License, version 2 only, | |
6 | * as published by the Free Software Foundation. | |
91d76f53 DG |
7 | * |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
d14d33bf AM |
13 | * You should have received a copy of the GNU General Public License along |
14 | * with this program; if not, write to the Free Software Foundation, Inc., | |
15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
91d76f53 DG |
16 | */ |
17 | ||
18 | #define _GNU_SOURCE | |
19 | #include <errno.h> | |
7972aab2 | 20 | #include <inttypes.h> |
91d76f53 DG |
21 | #include <pthread.h> |
22 | #include <stdio.h> | |
23 | #include <stdlib.h> | |
099e26bd | 24 | #include <string.h> |
aba8e916 DG |
25 | #include <sys/stat.h> |
26 | #include <sys/types.h> | |
099e26bd | 27 | #include <unistd.h> |
0df502fd | 28 | #include <urcu/compiler.h> |
fb54cdbf | 29 | #include <lttng/ust-error.h> |
331744e3 | 30 | #include <signal.h> |
bec39940 | 31 | |
990570ed | 32 | #include <common/common.h> |
86acf0da | 33 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 34 | |
7972aab2 | 35 | #include "buffer-registry.h" |
86acf0da | 36 | #include "fd-limit.h" |
8782cc74 | 37 | #include "health-sessiond.h" |
56fff090 | 38 | #include "ust-app.h" |
48842b30 | 39 | #include "ust-consumer.h" |
d80a6244 | 40 | #include "ust-ctl.h" |
0b2dc8df | 41 | #include "utils.h" |
d80a6244 | 42 | |
99090057 MD |
43 | static |
44 | int ust_app_flush_app_session(struct ust_app *app, struct ust_app_session *ua_sess); | |
45 | ||
d9bf3ca4 MD |
46 | /* Next available channel key. Access under next_channel_key_lock. */ |
47 | static uint64_t _next_channel_key; | |
48 | static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER; | |
49 | ||
50 | /* Next available session ID. Access under next_session_id_lock. */ | |
51 | static uint64_t _next_session_id; | |
52 | static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER; | |
ffe60014 DG |
53 | |
54 | /* | |
d9bf3ca4 | 55 | * Return the incremented value of next_channel_key. |
ffe60014 | 56 | */ |
d9bf3ca4 | 57 | static uint64_t get_next_channel_key(void) |
ffe60014 | 58 | { |
d9bf3ca4 MD |
59 | uint64_t ret; |
60 | ||
61 | pthread_mutex_lock(&next_channel_key_lock); | |
62 | ret = ++_next_channel_key; | |
63 | pthread_mutex_unlock(&next_channel_key_lock); | |
64 | return ret; | |
ffe60014 DG |
65 | } |
66 | ||
67 | /* | |
7972aab2 | 68 | * Return the atomically incremented value of next_session_id. |
ffe60014 | 69 | */ |
d9bf3ca4 | 70 | static uint64_t get_next_session_id(void) |
ffe60014 | 71 | { |
d9bf3ca4 MD |
72 | uint64_t ret; |
73 | ||
74 | pthread_mutex_lock(&next_session_id_lock); | |
75 | ret = ++_next_session_id; | |
76 | pthread_mutex_unlock(&next_session_id_lock); | |
77 | return ret; | |
ffe60014 DG |
78 | } |
79 | ||
d65d2de8 DG |
80 | static void copy_channel_attr_to_ustctl( |
81 | struct ustctl_consumer_channel_attr *attr, | |
82 | struct lttng_ust_channel_attr *uattr) | |
83 | { | |
84 | /* Copy event attributes since the layout is different. */ | |
85 | attr->subbuf_size = uattr->subbuf_size; | |
86 | attr->num_subbuf = uattr->num_subbuf; | |
87 | attr->overwrite = uattr->overwrite; | |
88 | attr->switch_timer_interval = uattr->switch_timer_interval; | |
89 | attr->read_timer_interval = uattr->read_timer_interval; | |
90 | attr->output = uattr->output; | |
91 | } | |
92 | ||
025faf73 DG |
93 | /* |
94 | * Match function for the hash table lookup. | |
95 | * | |
96 | * It matches an ust app event based on three attributes which are the event | |
97 | * name, the filter bytecode and the loglevel. | |
98 | */ | |
18eace3b DG |
99 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
100 | { | |
101 | struct ust_app_event *event; | |
102 | const struct ust_app_ht_key *key; | |
103 | ||
104 | assert(node); | |
105 | assert(_key); | |
106 | ||
107 | event = caa_container_of(node, struct ust_app_event, node.node); | |
108 | key = _key; | |
109 | ||
1af53eb5 | 110 | /* Match the 4 elements of the key: name, filter, loglevel, exclusions */ |
18eace3b DG |
111 | |
112 | /* Event name */ | |
113 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
114 | goto no_match; | |
115 | } | |
116 | ||
117 | /* Event loglevel. */ | |
118 | if (event->attr.loglevel != key->loglevel) { | |
025faf73 DG |
119 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
120 | && key->loglevel == 0 && event->attr.loglevel == -1) { | |
121 | /* | |
122 | * Match is accepted. This is because on event creation, the | |
123 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
124 | * -1 are accepted for this loglevel type since 0 is the one set by | |
125 | * the API when receiving an enable event. | |
126 | */ | |
127 | } else { | |
128 | goto no_match; | |
129 | } | |
18eace3b DG |
130 | } |
131 | ||
132 | /* One of the filters is NULL, fail. */ | |
133 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
134 | goto no_match; | |
135 | } | |
136 | ||
025faf73 DG |
137 | if (key->filter && event->filter) { |
138 | /* Both filters exists, check length followed by the bytecode. */ | |
139 | if (event->filter->len != key->filter->len || | |
140 | memcmp(event->filter->data, key->filter->data, | |
141 | event->filter->len) != 0) { | |
142 | goto no_match; | |
143 | } | |
18eace3b DG |
144 | } |
145 | ||
1af53eb5 JI |
146 | /* One of the exclusions is NULL, fail. */ |
147 | if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) { | |
148 | goto no_match; | |
149 | } | |
150 | ||
151 | if (key->exclusion && event->exclusion) { | |
152 | /* Both exclusions exists, check count followed by the names. */ | |
153 | if (event->exclusion->count != key->exclusion->count || | |
154 | memcmp(event->exclusion->names, key->exclusion->names, | |
155 | event->exclusion->count * LTTNG_UST_SYM_NAME_LEN) != 0) { | |
156 | goto no_match; | |
157 | } | |
158 | } | |
159 | ||
160 | ||
025faf73 | 161 | /* Match. */ |
18eace3b DG |
162 | return 1; |
163 | ||
164 | no_match: | |
165 | return 0; | |
18eace3b DG |
166 | } |
167 | ||
025faf73 DG |
168 | /* |
169 | * Unique add of an ust app event in the given ht. This uses the custom | |
170 | * ht_match_ust_app_event match function and the event name as hash. | |
171 | */ | |
d0b96690 | 172 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
173 | struct ust_app_event *event) |
174 | { | |
175 | struct cds_lfht_node *node_ptr; | |
176 | struct ust_app_ht_key key; | |
d0b96690 | 177 | struct lttng_ht *ht; |
18eace3b | 178 | |
d0b96690 DG |
179 | assert(ua_chan); |
180 | assert(ua_chan->events); | |
18eace3b DG |
181 | assert(event); |
182 | ||
d0b96690 | 183 | ht = ua_chan->events; |
18eace3b DG |
184 | key.name = event->attr.name; |
185 | key.filter = event->filter; | |
186 | key.loglevel = event->attr.loglevel; | |
91c89f23 | 187 | key.exclusion = event->exclusion; |
18eace3b DG |
188 | |
189 | node_ptr = cds_lfht_add_unique(ht->ht, | |
190 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
191 | ht_match_ust_app_event, &key, &event->node.node); | |
192 | assert(node_ptr == &event->node.node); | |
193 | } | |
194 | ||
d88aee68 DG |
195 | /* |
196 | * Close the notify socket from the given RCU head object. This MUST be called | |
197 | * through a call_rcu(). | |
198 | */ | |
199 | static void close_notify_sock_rcu(struct rcu_head *head) | |
200 | { | |
201 | int ret; | |
202 | struct ust_app_notify_sock_obj *obj = | |
203 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
204 | ||
205 | /* Must have a valid fd here. */ | |
206 | assert(obj->fd >= 0); | |
207 | ||
208 | ret = close(obj->fd); | |
209 | if (ret) { | |
210 | ERR("close notify sock %d RCU", obj->fd); | |
211 | } | |
212 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
213 | ||
214 | free(obj); | |
215 | } | |
216 | ||
7972aab2 DG |
217 | /* |
218 | * Return the session registry according to the buffer type of the given | |
219 | * session. | |
220 | * | |
221 | * A registry per UID object MUST exists before calling this function or else | |
222 | * it assert() if not found. RCU read side lock must be acquired. | |
223 | */ | |
224 | static struct ust_registry_session *get_session_registry( | |
225 | struct ust_app_session *ua_sess) | |
226 | { | |
227 | struct ust_registry_session *registry = NULL; | |
228 | ||
229 | assert(ua_sess); | |
230 | ||
231 | switch (ua_sess->buffer_type) { | |
232 | case LTTNG_BUFFER_PER_PID: | |
233 | { | |
234 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
235 | if (!reg_pid) { | |
236 | goto error; | |
237 | } | |
238 | registry = reg_pid->registry->reg.ust; | |
239 | break; | |
240 | } | |
241 | case LTTNG_BUFFER_PER_UID: | |
242 | { | |
243 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
244 | ua_sess->tracing_id, ua_sess->bits_per_long, ua_sess->uid); | |
245 | if (!reg_uid) { | |
246 | goto error; | |
247 | } | |
248 | registry = reg_uid->registry->reg.ust; | |
249 | break; | |
250 | } | |
251 | default: | |
252 | assert(0); | |
253 | }; | |
254 | ||
255 | error: | |
256 | return registry; | |
257 | } | |
258 | ||
55cc08a6 DG |
259 | /* |
260 | * Delete ust context safely. RCU read lock must be held before calling | |
261 | * this function. | |
262 | */ | |
263 | static | |
264 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx) | |
265 | { | |
ffe60014 DG |
266 | int ret; |
267 | ||
268 | assert(ua_ctx); | |
269 | ||
55cc08a6 | 270 | if (ua_ctx->obj) { |
ffe60014 | 271 | ret = ustctl_release_object(sock, ua_ctx->obj); |
d0b96690 DG |
272 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
273 | ERR("UST app sock %d release ctx obj handle %d failed with ret %d", | |
274 | sock, ua_ctx->obj->handle, ret); | |
ffe60014 | 275 | } |
55cc08a6 DG |
276 | free(ua_ctx->obj); |
277 | } | |
278 | free(ua_ctx); | |
279 | } | |
280 | ||
d80a6244 DG |
281 | /* |
282 | * Delete ust app event safely. RCU read lock must be held before calling | |
283 | * this function. | |
284 | */ | |
8b366481 DG |
285 | static |
286 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event) | |
d80a6244 | 287 | { |
ffe60014 DG |
288 | int ret; |
289 | ||
290 | assert(ua_event); | |
291 | ||
53a80697 | 292 | free(ua_event->filter); |
951f0b71 JI |
293 | if (ua_event->exclusion != NULL) |
294 | free(ua_event->exclusion); | |
edb67388 | 295 | if (ua_event->obj != NULL) { |
ffe60014 DG |
296 | ret = ustctl_release_object(sock, ua_event->obj); |
297 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
298 | ERR("UST app sock %d release event obj failed with ret %d", | |
299 | sock, ret); | |
300 | } | |
edb67388 DG |
301 | free(ua_event->obj); |
302 | } | |
d80a6244 DG |
303 | free(ua_event); |
304 | } | |
305 | ||
306 | /* | |
7972aab2 DG |
307 | * Release ust data object of the given stream. |
308 | * | |
309 | * Return 0 on success or else a negative value. | |
d80a6244 | 310 | */ |
7972aab2 | 311 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream) |
d80a6244 | 312 | { |
7972aab2 | 313 | int ret = 0; |
ffe60014 DG |
314 | |
315 | assert(stream); | |
316 | ||
8b366481 | 317 | if (stream->obj) { |
ffe60014 DG |
318 | ret = ustctl_release_object(sock, stream->obj); |
319 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
320 | ERR("UST app sock %d release stream obj failed with ret %d", | |
321 | sock, ret); | |
322 | } | |
4063050c | 323 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
324 | free(stream->obj); |
325 | } | |
7972aab2 DG |
326 | |
327 | return ret; | |
328 | } | |
329 | ||
330 | /* | |
331 | * Delete ust app stream safely. RCU read lock must be held before calling | |
332 | * this function. | |
333 | */ | |
334 | static | |
335 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream) | |
336 | { | |
337 | assert(stream); | |
338 | ||
339 | (void) release_ust_app_stream(sock, stream); | |
84cd17c6 | 340 | free(stream); |
d80a6244 DG |
341 | } |
342 | ||
36b588ed MD |
343 | /* |
344 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
345 | * section and outside of call_rcu thread, so we postpone its execution |
346 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
347 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
348 | */ |
349 | static | |
350 | void delete_ust_app_channel_rcu(struct rcu_head *head) | |
351 | { | |
352 | struct ust_app_channel *ua_chan = | |
353 | caa_container_of(head, struct ust_app_channel, rcu_head); | |
354 | ||
0b2dc8df MD |
355 | ht_cleanup_push(ua_chan->ctx); |
356 | ht_cleanup_push(ua_chan->events); | |
36b588ed MD |
357 | free(ua_chan); |
358 | } | |
359 | ||
d80a6244 DG |
360 | /* |
361 | * Delete ust app channel safely. RCU read lock must be held before calling | |
362 | * this function. | |
363 | */ | |
8b366481 | 364 | static |
d0b96690 DG |
365 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
366 | struct ust_app *app) | |
d80a6244 DG |
367 | { |
368 | int ret; | |
bec39940 | 369 | struct lttng_ht_iter iter; |
d80a6244 | 370 | struct ust_app_event *ua_event; |
55cc08a6 | 371 | struct ust_app_ctx *ua_ctx; |
030a66fa | 372 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 373 | struct ust_registry_session *registry; |
d80a6244 | 374 | |
ffe60014 DG |
375 | assert(ua_chan); |
376 | ||
377 | DBG3("UST app deleting channel %s", ua_chan->name); | |
378 | ||
55cc08a6 | 379 | /* Wipe stream */ |
d80a6244 | 380 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 381 | cds_list_del(&stream->list); |
d80a6244 DG |
382 | delete_ust_app_stream(sock, stream); |
383 | } | |
384 | ||
55cc08a6 | 385 | /* Wipe context */ |
bec39940 | 386 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
31746f93 | 387 | cds_list_del(&ua_ctx->list); |
bec39940 | 388 | ret = lttng_ht_del(ua_chan->ctx, &iter); |
55cc08a6 DG |
389 | assert(!ret); |
390 | delete_ust_app_ctx(sock, ua_ctx); | |
391 | } | |
d80a6244 | 392 | |
55cc08a6 | 393 | /* Wipe events */ |
bec39940 DG |
394 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
395 | node.node) { | |
396 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 397 | assert(!ret); |
d80a6244 DG |
398 | delete_ust_app_event(sock, ua_event); |
399 | } | |
edb67388 | 400 | |
c8335706 MD |
401 | if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) { |
402 | /* Wipe and free registry from session registry. */ | |
403 | registry = get_session_registry(ua_chan->session); | |
404 | if (registry) { | |
405 | ust_registry_channel_del_free(registry, ua_chan->key); | |
406 | } | |
7972aab2 | 407 | } |
d0b96690 | 408 | |
edb67388 | 409 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
410 | /* Remove channel from application UST object descriptor. */ |
411 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
c6e62271 DG |
412 | ret = lttng_ht_del(app->ust_objd, &iter); |
413 | assert(!ret); | |
ffe60014 DG |
414 | ret = ustctl_release_object(sock, ua_chan->obj); |
415 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
416 | ERR("UST app sock %d release channel obj failed with ret %d", | |
417 | sock, ret); | |
418 | } | |
7972aab2 | 419 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
420 | free(ua_chan->obj); |
421 | } | |
36b588ed | 422 | call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); |
d80a6244 DG |
423 | } |
424 | ||
331744e3 | 425 | /* |
1b532a60 DG |
426 | * Push metadata to consumer socket. |
427 | * | |
b2040829 MD |
428 | * RCU read-side lock must be held to guarantee existance of socket. |
429 | * Must be called with the ust app session lock held. | |
430 | * Must be called with the registry lock held. | |
331744e3 JD |
431 | * |
432 | * On success, return the len of metadata pushed or else a negative value. | |
433 | */ | |
434 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
435 | struct consumer_socket *socket, int send_zero_data) | |
436 | { | |
437 | int ret; | |
438 | char *metadata_str = NULL; | |
439 | size_t len, offset; | |
440 | ssize_t ret_val; | |
441 | ||
442 | assert(registry); | |
443 | assert(socket); | |
1b532a60 | 444 | |
e3ae3c71 | 445 | /* |
b2040829 MD |
446 | * Means that no metadata was assigned to the session. This can |
447 | * happens if no start has been done previously. | |
e3ae3c71 MD |
448 | */ |
449 | if (!registry->metadata_key) { | |
e3ae3c71 MD |
450 | return 0; |
451 | } | |
452 | ||
1b532a60 | 453 | /* |
b2040829 MD |
454 | * On a push metadata error either the consumer is dead or the |
455 | * metadata channel has been destroyed because its endpoint | |
456 | * might have died (e.g: relayd). If so, the metadata closed | |
457 | * flag is set to 1 so we deny pushing metadata again which is | |
458 | * not valid anymore on the consumer side. | |
1b532a60 DG |
459 | */ |
460 | if (registry->metadata_closed) { | |
461 | return -EPIPE; | |
462 | } | |
331744e3 | 463 | |
331744e3 JD |
464 | offset = registry->metadata_len_sent; |
465 | len = registry->metadata_len - registry->metadata_len_sent; | |
466 | if (len == 0) { | |
467 | DBG3("No metadata to push for metadata key %" PRIu64, | |
468 | registry->metadata_key); | |
469 | ret_val = len; | |
470 | if (send_zero_data) { | |
471 | DBG("No metadata to push"); | |
472 | goto push_data; | |
473 | } | |
474 | goto end; | |
475 | } | |
476 | ||
477 | /* Allocate only what we have to send. */ | |
478 | metadata_str = zmalloc(len); | |
479 | if (!metadata_str) { | |
480 | PERROR("zmalloc ust app metadata string"); | |
481 | ret_val = -ENOMEM; | |
482 | goto error; | |
483 | } | |
484 | /* Copy what we haven't send out. */ | |
485 | memcpy(metadata_str, registry->metadata + offset, len); | |
486 | registry->metadata_len_sent += len; | |
487 | ||
488 | push_data: | |
331744e3 JD |
489 | ret = consumer_push_metadata(socket, registry->metadata_key, |
490 | metadata_str, len, offset); | |
491 | if (ret < 0) { | |
000baf6a | 492 | /* |
b2040829 MD |
493 | * There is an acceptable race here between the registry |
494 | * metadata key assignment and the creation on the | |
495 | * consumer. The session daemon can concurrently push | |
496 | * metadata for this registry while being created on the | |
497 | * consumer since the metadata key of the registry is | |
498 | * assigned *before* it is setup to avoid the consumer | |
499 | * to ask for metadata that could possibly be not found | |
500 | * in the session daemon. | |
000baf6a | 501 | * |
b2040829 MD |
502 | * The metadata will get pushed either by the session |
503 | * being stopped or the consumer requesting metadata if | |
504 | * that race is triggered. | |
000baf6a DG |
505 | */ |
506 | if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) { | |
507 | ret = 0; | |
508 | } | |
ffa3f245 | 509 | |
b2040829 MD |
510 | /* |
511 | * Update back the actual metadata len sent since it | |
512 | * failed here. | |
513 | */ | |
ffa3f245 | 514 | registry->metadata_len_sent -= len; |
331744e3 JD |
515 | ret_val = ret; |
516 | goto error_push; | |
517 | } | |
518 | ||
519 | free(metadata_str); | |
520 | return len; | |
521 | ||
522 | end: | |
523 | error: | |
e3ae3c71 MD |
524 | if (ret_val) { |
525 | /* | |
b2040829 MD |
526 | * On error, flag the registry that the metadata is |
527 | * closed. We were unable to push anything and this | |
528 | * means that either the consumer is not responding or | |
529 | * the metadata cache has been destroyed on the | |
530 | * consumer. | |
e3ae3c71 MD |
531 | */ |
532 | registry->metadata_closed = 1; | |
533 | } | |
331744e3 JD |
534 | error_push: |
535 | free(metadata_str); | |
536 | return ret_val; | |
537 | } | |
538 | ||
d88aee68 | 539 | /* |
e3ae3c71 | 540 | * For a given application and session, push metadata to consumer. |
331744e3 JD |
541 | * Either sock or consumer is required : if sock is NULL, the default |
542 | * socket to send the metadata is retrieved from consumer, if sock | |
543 | * is not NULL we use it to send the metadata. | |
e3ae3c71 | 544 | * RCU read-side lock must be held while calling this function, |
b2040829 MD |
545 | * therefore ensuring existance of registry. It also ensures existance |
546 | * of socket throughout this function. | |
d88aee68 DG |
547 | * |
548 | * Return 0 on success else a negative error. | |
549 | */ | |
7972aab2 DG |
550 | static int push_metadata(struct ust_registry_session *registry, |
551 | struct consumer_output *consumer) | |
d88aee68 | 552 | { |
331744e3 JD |
553 | int ret_val; |
554 | ssize_t ret; | |
d88aee68 DG |
555 | struct consumer_socket *socket; |
556 | ||
7972aab2 DG |
557 | assert(registry); |
558 | assert(consumer); | |
559 | ||
e3ae3c71 | 560 | pthread_mutex_lock(®istry->lock); |
e3ae3c71 | 561 | if (registry->metadata_closed) { |
b2040829 MD |
562 | ret_val = -EPIPE; |
563 | goto error; | |
d88aee68 DG |
564 | } |
565 | ||
d88aee68 | 566 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
567 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
568 | consumer); | |
d88aee68 | 569 | if (!socket) { |
331744e3 | 570 | ret_val = -1; |
e3ae3c71 | 571 | goto error; |
d88aee68 DG |
572 | } |
573 | ||
331744e3 | 574 | ret = ust_app_push_metadata(registry, socket, 0); |
d88aee68 | 575 | if (ret < 0) { |
331744e3 | 576 | ret_val = ret; |
e3ae3c71 | 577 | goto error; |
d88aee68 | 578 | } |
b2040829 | 579 | pthread_mutex_unlock(®istry->lock); |
d88aee68 DG |
580 | return 0; |
581 | ||
e3ae3c71 MD |
582 | error: |
583 | end: | |
b2040829 | 584 | pthread_mutex_unlock(®istry->lock); |
331744e3 | 585 | return ret_val; |
d88aee68 DG |
586 | } |
587 | ||
588 | /* | |
589 | * Send to the consumer a close metadata command for the given session. Once | |
590 | * done, the metadata channel is deleted and the session metadata pointer is | |
b2040829 | 591 | * nullified. The session lock MUST be held unless the application is |
d88aee68 DG |
592 | * in the destroy path. |
593 | * | |
594 | * Return 0 on success else a negative value. | |
595 | */ | |
7972aab2 DG |
596 | static int close_metadata(struct ust_registry_session *registry, |
597 | struct consumer_output *consumer) | |
d88aee68 DG |
598 | { |
599 | int ret; | |
600 | struct consumer_socket *socket; | |
601 | ||
7972aab2 DG |
602 | assert(registry); |
603 | assert(consumer); | |
d88aee68 | 604 | |
7972aab2 DG |
605 | rcu_read_lock(); |
606 | ||
e3ae3c71 MD |
607 | pthread_mutex_lock(®istry->lock); |
608 | ||
7972aab2 | 609 | if (!registry->metadata_key || registry->metadata_closed) { |
d88aee68 | 610 | ret = 0; |
1b532a60 | 611 | goto end; |
d88aee68 DG |
612 | } |
613 | ||
d88aee68 | 614 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
615 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
616 | consumer); | |
d88aee68 DG |
617 | if (!socket) { |
618 | ret = -1; | |
7972aab2 | 619 | goto error; |
d88aee68 DG |
620 | } |
621 | ||
7972aab2 | 622 | ret = consumer_close_metadata(socket, registry->metadata_key); |
d88aee68 | 623 | if (ret < 0) { |
7972aab2 | 624 | goto error; |
d88aee68 DG |
625 | } |
626 | ||
d88aee68 | 627 | error: |
1b532a60 DG |
628 | /* |
629 | * Metadata closed. Even on error this means that the consumer is not | |
630 | * responding or not found so either way a second close should NOT be emit | |
631 | * for this registry. | |
632 | */ | |
633 | registry->metadata_closed = 1; | |
634 | end: | |
e3ae3c71 | 635 | pthread_mutex_unlock(®istry->lock); |
7972aab2 | 636 | rcu_read_unlock(); |
d88aee68 DG |
637 | return ret; |
638 | } | |
639 | ||
36b588ed MD |
640 | /* |
641 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
642 | * section and outside of call_rcu thread, so we postpone its execution |
643 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
644 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
645 | */ |
646 | static | |
647 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
648 | { | |
649 | struct ust_app_session *ua_sess = | |
650 | caa_container_of(head, struct ust_app_session, rcu_head); | |
651 | ||
0b2dc8df | 652 | ht_cleanup_push(ua_sess->channels); |
36b588ed MD |
653 | free(ua_sess); |
654 | } | |
655 | ||
d80a6244 DG |
656 | /* |
657 | * Delete ust app session safely. RCU read lock must be held before calling | |
658 | * this function. | |
659 | */ | |
8b366481 | 660 | static |
d0b96690 DG |
661 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
662 | struct ust_app *app) | |
d80a6244 DG |
663 | { |
664 | int ret; | |
bec39940 | 665 | struct lttng_ht_iter iter; |
d80a6244 | 666 | struct ust_app_channel *ua_chan; |
7972aab2 | 667 | struct ust_registry_session *registry; |
d80a6244 | 668 | |
d88aee68 DG |
669 | assert(ua_sess); |
670 | ||
1b532a60 DG |
671 | pthread_mutex_lock(&ua_sess->lock); |
672 | ||
7972aab2 | 673 | registry = get_session_registry(ua_sess); |
e3ae3c71 | 674 | if (registry) { |
d88aee68 | 675 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 676 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 677 | |
7972aab2 DG |
678 | /* |
679 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
680 | * metadata only on destroy trace session in this case. Also, the |
681 | * previous push metadata could have flag the metadata registry to | |
682 | * close so don't send a close command if closed. | |
7972aab2 | 683 | */ |
e3ae3c71 | 684 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
685 | /* And ask to close it for this session registry. */ |
686 | (void) close_metadata(registry, ua_sess->consumer); | |
687 | } | |
d80a6244 DG |
688 | } |
689 | ||
bec39940 DG |
690 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
691 | node.node) { | |
692 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 693 | assert(!ret); |
d0b96690 | 694 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 695 | } |
d80a6244 | 696 | |
7972aab2 DG |
697 | /* In case of per PID, the registry is kept in the session. */ |
698 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
699 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
700 | if (reg_pid) { | |
701 | buffer_reg_pid_remove(reg_pid); | |
702 | buffer_reg_pid_destroy(reg_pid); | |
703 | } | |
704 | } | |
d0b96690 | 705 | |
aee6bafd | 706 | if (ua_sess->handle != -1) { |
ffe60014 DG |
707 | ret = ustctl_release_handle(sock, ua_sess->handle); |
708 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
709 | ERR("UST app sock %d release session handle failed with ret %d", | |
710 | sock, ret); | |
711 | } | |
aee6bafd | 712 | } |
1b532a60 DG |
713 | pthread_mutex_unlock(&ua_sess->lock); |
714 | ||
36b588ed | 715 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 716 | } |
91d76f53 DG |
717 | |
718 | /* | |
284d8f55 DG |
719 | * Delete a traceable application structure from the global list. Never call |
720 | * this function outside of a call_rcu call. | |
36b588ed MD |
721 | * |
722 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 723 | */ |
8b366481 DG |
724 | static |
725 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 726 | { |
8b366481 | 727 | int ret, sock; |
d42f20df | 728 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 729 | |
d80a6244 | 730 | /* Delete ust app sessions info */ |
852d0037 DG |
731 | sock = app->sock; |
732 | app->sock = -1; | |
d80a6244 | 733 | |
8b366481 | 734 | /* Wipe sessions */ |
d42f20df DG |
735 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
736 | teardown_node) { | |
737 | /* Free every object in the session and the session. */ | |
36b588ed | 738 | rcu_read_lock(); |
d0b96690 | 739 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 740 | rcu_read_unlock(); |
d80a6244 | 741 | } |
36b588ed | 742 | |
0b2dc8df MD |
743 | ht_cleanup_push(app->sessions); |
744 | ht_cleanup_push(app->ust_objd); | |
d80a6244 | 745 | |
6414a713 | 746 | /* |
852d0037 DG |
747 | * Wait until we have deleted the application from the sock hash table |
748 | * before closing this socket, otherwise an application could re-use the | |
749 | * socket ID and race with the teardown, using the same hash table entry. | |
750 | * | |
751 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
752 | * all RCU readers that could run concurrently with unregister app, | |
753 | * therefore we _need_ to only close that socket after a grace period. So | |
754 | * it should stay in this RCU callback. | |
755 | * | |
756 | * This close() is a very important step of the synchronization model so | |
757 | * every modification to this function must be carefully reviewed. | |
6414a713 | 758 | */ |
799e2c4f MD |
759 | ret = close(sock); |
760 | if (ret) { | |
761 | PERROR("close"); | |
762 | } | |
4063050c | 763 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 764 | |
852d0037 | 765 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 766 | free(app); |
099e26bd DG |
767 | } |
768 | ||
769 | /* | |
f6a9efaa | 770 | * URCU intermediate call to delete an UST app. |
099e26bd | 771 | */ |
8b366481 DG |
772 | static |
773 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 774 | { |
bec39940 DG |
775 | struct lttng_ht_node_ulong *node = |
776 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 777 | struct ust_app *app = |
852d0037 | 778 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 779 | |
852d0037 | 780 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 781 | delete_ust_app(app); |
099e26bd DG |
782 | } |
783 | ||
ffe60014 DG |
784 | /* |
785 | * Delete the session from the application ht and delete the data structure by | |
786 | * freeing every object inside and releasing them. | |
787 | */ | |
d0b96690 | 788 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
789 | struct ust_app_session *ua_sess) |
790 | { | |
791 | int ret; | |
792 | struct lttng_ht_iter iter; | |
793 | ||
794 | assert(app); | |
795 | assert(ua_sess); | |
796 | ||
797 | iter.iter.node = &ua_sess->node.node; | |
798 | ret = lttng_ht_del(app->sessions, &iter); | |
799 | if (ret) { | |
800 | /* Already scheduled for teardown. */ | |
801 | goto end; | |
802 | } | |
803 | ||
804 | /* Once deleted, free the data structure. */ | |
d0b96690 | 805 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
806 | |
807 | end: | |
808 | return; | |
809 | } | |
810 | ||
8b366481 DG |
811 | /* |
812 | * Alloc new UST app session. | |
813 | */ | |
814 | static | |
d0b96690 | 815 | struct ust_app_session *alloc_ust_app_session(struct ust_app *app) |
8b366481 DG |
816 | { |
817 | struct ust_app_session *ua_sess; | |
818 | ||
819 | /* Init most of the default value by allocating and zeroing */ | |
820 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
821 | if (ua_sess == NULL) { | |
822 | PERROR("malloc"); | |
ffe60014 | 823 | goto error_free; |
8b366481 DG |
824 | } |
825 | ||
826 | ua_sess->handle = -1; | |
bec39940 | 827 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
ad7a9107 | 828 | ua_sess->metadata_attr.type = LTTNG_UST_CHAN_METADATA; |
84ad93e8 | 829 | pthread_mutex_init(&ua_sess->lock, NULL); |
ad7a9107 | 830 | |
8b366481 DG |
831 | return ua_sess; |
832 | ||
ffe60014 | 833 | error_free: |
8b366481 DG |
834 | return NULL; |
835 | } | |
836 | ||
837 | /* | |
838 | * Alloc new UST app channel. | |
839 | */ | |
840 | static | |
841 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 842 | struct ust_app_session *ua_sess, |
ffe60014 | 843 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
844 | { |
845 | struct ust_app_channel *ua_chan; | |
846 | ||
847 | /* Init most of the default value by allocating and zeroing */ | |
848 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
849 | if (ua_chan == NULL) { | |
850 | PERROR("malloc"); | |
851 | goto error; | |
852 | } | |
853 | ||
854 | /* Setup channel name */ | |
855 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
856 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
857 | ||
858 | ua_chan->enabled = 1; | |
859 | ua_chan->handle = -1; | |
45893984 | 860 | ua_chan->session = ua_sess; |
ffe60014 | 861 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
862 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
863 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
864 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
865 | |
866 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
31746f93 | 867 | CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); |
8b366481 DG |
868 | |
869 | /* Copy attributes */ | |
870 | if (attr) { | |
ffe60014 | 871 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
872 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
873 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
874 | ua_chan->attr.overwrite = attr->overwrite; | |
875 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
876 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
877 | ua_chan->attr.output = attr->output; | |
8b366481 | 878 | } |
ffe60014 DG |
879 | /* By default, the channel is a per cpu channel. */ |
880 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
881 | |
882 | DBG3("UST app channel %s allocated", ua_chan->name); | |
883 | ||
884 | return ua_chan; | |
885 | ||
886 | error: | |
887 | return NULL; | |
888 | } | |
889 | ||
37f1c236 DG |
890 | /* |
891 | * Allocate and initialize a UST app stream. | |
892 | * | |
893 | * Return newly allocated stream pointer or NULL on error. | |
894 | */ | |
ffe60014 | 895 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
896 | { |
897 | struct ust_app_stream *stream = NULL; | |
898 | ||
899 | stream = zmalloc(sizeof(*stream)); | |
900 | if (stream == NULL) { | |
901 | PERROR("zmalloc ust app stream"); | |
902 | goto error; | |
903 | } | |
904 | ||
905 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
906 | stream->handle = -1; | |
907 | ||
908 | error: | |
909 | return stream; | |
910 | } | |
911 | ||
8b366481 DG |
912 | /* |
913 | * Alloc new UST app event. | |
914 | */ | |
915 | static | |
916 | struct ust_app_event *alloc_ust_app_event(char *name, | |
917 | struct lttng_ust_event *attr) | |
918 | { | |
919 | struct ust_app_event *ua_event; | |
920 | ||
921 | /* Init most of the default value by allocating and zeroing */ | |
922 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
923 | if (ua_event == NULL) { | |
924 | PERROR("malloc"); | |
925 | goto error; | |
926 | } | |
927 | ||
928 | ua_event->enabled = 1; | |
929 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
930 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 931 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
932 | |
933 | /* Copy attributes */ | |
934 | if (attr) { | |
935 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
936 | } | |
937 | ||
938 | DBG3("UST app event %s allocated", ua_event->name); | |
939 | ||
940 | return ua_event; | |
941 | ||
942 | error: | |
943 | return NULL; | |
944 | } | |
945 | ||
946 | /* | |
947 | * Alloc new UST app context. | |
948 | */ | |
949 | static | |
950 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx) | |
951 | { | |
952 | struct ust_app_ctx *ua_ctx; | |
953 | ||
954 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
955 | if (ua_ctx == NULL) { | |
956 | goto error; | |
957 | } | |
958 | ||
31746f93 DG |
959 | CDS_INIT_LIST_HEAD(&ua_ctx->list); |
960 | ||
8b366481 DG |
961 | if (uctx) { |
962 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
963 | } | |
964 | ||
965 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
966 | ||
967 | error: | |
968 | return ua_ctx; | |
969 | } | |
970 | ||
025faf73 DG |
971 | /* |
972 | * Allocate a filter and copy the given original filter. | |
973 | * | |
974 | * Return allocated filter or NULL on error. | |
975 | */ | |
976 | static struct lttng_ust_filter_bytecode *alloc_copy_ust_app_filter( | |
977 | struct lttng_ust_filter_bytecode *orig_f) | |
978 | { | |
979 | struct lttng_ust_filter_bytecode *filter = NULL; | |
980 | ||
981 | /* Copy filter bytecode */ | |
982 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
983 | if (!filter) { | |
984 | PERROR("zmalloc alloc ust app filter"); | |
985 | goto error; | |
986 | } | |
987 | ||
988 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
989 | ||
990 | error: | |
991 | return filter; | |
992 | } | |
993 | ||
099e26bd | 994 | /* |
421cb601 DG |
995 | * Find an ust_app using the sock and return it. RCU read side lock must be |
996 | * held before calling this helper function. | |
099e26bd | 997 | */ |
f20baf8e | 998 | struct ust_app *ust_app_find_by_sock(int sock) |
099e26bd | 999 | { |
bec39940 | 1000 | struct lttng_ht_node_ulong *node; |
bec39940 | 1001 | struct lttng_ht_iter iter; |
f6a9efaa | 1002 | |
852d0037 | 1003 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 1004 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
1005 | if (node == NULL) { |
1006 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
1007 | goto error; |
1008 | } | |
852d0037 DG |
1009 | |
1010 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
1011 | |
1012 | error: | |
1013 | return NULL; | |
099e26bd DG |
1014 | } |
1015 | ||
d0b96690 DG |
1016 | /* |
1017 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
1018 | * be held before calling this helper function. | |
1019 | */ | |
1020 | static struct ust_app *find_app_by_notify_sock(int sock) | |
1021 | { | |
1022 | struct lttng_ht_node_ulong *node; | |
1023 | struct lttng_ht_iter iter; | |
1024 | ||
1025 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
1026 | &iter); | |
1027 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1028 | if (node == NULL) { | |
1029 | DBG2("UST app find by notify sock %d not found", sock); | |
1030 | goto error; | |
1031 | } | |
1032 | ||
1033 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
1034 | ||
1035 | error: | |
1036 | return NULL; | |
1037 | } | |
1038 | ||
025faf73 DG |
1039 | /* |
1040 | * Lookup for an ust app event based on event name, filter bytecode and the | |
1041 | * event loglevel. | |
1042 | * | |
1043 | * Return an ust_app_event object or NULL on error. | |
1044 | */ | |
18eace3b | 1045 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
39c5a3a7 JI |
1046 | char *name, struct lttng_ust_filter_bytecode *filter, int loglevel, |
1047 | const struct lttng_event_exclusion *exclusion) | |
18eace3b DG |
1048 | { |
1049 | struct lttng_ht_iter iter; | |
1050 | struct lttng_ht_node_str *node; | |
1051 | struct ust_app_event *event = NULL; | |
1052 | struct ust_app_ht_key key; | |
18eace3b DG |
1053 | |
1054 | assert(name); | |
1055 | assert(ht); | |
1056 | ||
1057 | /* Setup key for event lookup. */ | |
1058 | key.name = name; | |
1059 | key.filter = filter; | |
1060 | key.loglevel = loglevel; | |
39c5a3a7 JI |
1061 | /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */ |
1062 | key.exclusion = (struct lttng_ust_event_exclusion *)exclusion; | |
18eace3b | 1063 | |
025faf73 DG |
1064 | /* Lookup using the event name as hash and a custom match fct. */ |
1065 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1066 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1067 | node = lttng_ht_iter_get_node_str(&iter); |
1068 | if (node == NULL) { | |
1069 | goto end; | |
1070 | } | |
1071 | ||
1072 | event = caa_container_of(node, struct ust_app_event, node); | |
1073 | ||
1074 | end: | |
18eace3b DG |
1075 | return event; |
1076 | } | |
1077 | ||
55cc08a6 DG |
1078 | /* |
1079 | * Create the channel context on the tracer. | |
d0b96690 DG |
1080 | * |
1081 | * Called with UST app session lock held. | |
55cc08a6 DG |
1082 | */ |
1083 | static | |
1084 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1085 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1086 | { | |
1087 | int ret; | |
1088 | ||
840cb59c | 1089 | health_code_update(); |
86acf0da | 1090 | |
852d0037 | 1091 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 DG |
1092 | ua_chan->obj, &ua_ctx->obj); |
1093 | if (ret < 0) { | |
ffe60014 DG |
1094 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1095 | ERR("UST app create channel context failed for app (pid: %d) " | |
1096 | "with ret %d", app->pid, ret); | |
1097 | } else { | |
3757b385 DG |
1098 | /* |
1099 | * This is normal behavior, an application can die during the | |
1100 | * creation process. Don't report an error so the execution can | |
1101 | * continue normally. | |
1102 | */ | |
1103 | ret = 0; | |
ffe60014 DG |
1104 | DBG3("UST app disable event failed. Application is dead."); |
1105 | } | |
55cc08a6 DG |
1106 | goto error; |
1107 | } | |
1108 | ||
1109 | ua_ctx->handle = ua_ctx->obj->handle; | |
1110 | ||
d0b96690 DG |
1111 | DBG2("UST app context handle %d created successfully for channel %s", |
1112 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1113 | |
1114 | error: | |
840cb59c | 1115 | health_code_update(); |
55cc08a6 DG |
1116 | return ret; |
1117 | } | |
1118 | ||
53a80697 MD |
1119 | /* |
1120 | * Set the filter on the tracer. | |
1121 | */ | |
1122 | static | |
1123 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
1124 | struct ust_app *app) | |
1125 | { | |
1126 | int ret; | |
1127 | ||
840cb59c | 1128 | health_code_update(); |
86acf0da | 1129 | |
53a80697 | 1130 | if (!ua_event->filter) { |
86acf0da DG |
1131 | ret = 0; |
1132 | goto error; | |
53a80697 MD |
1133 | } |
1134 | ||
1135 | ret = ustctl_set_filter(app->sock, ua_event->filter, | |
1136 | ua_event->obj); | |
1137 | if (ret < 0) { | |
ffe60014 DG |
1138 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1139 | ERR("UST app event %s filter failed for app (pid: %d) " | |
1140 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1141 | } else { | |
3757b385 DG |
1142 | /* |
1143 | * This is normal behavior, an application can die during the | |
1144 | * creation process. Don't report an error so the execution can | |
1145 | * continue normally. | |
1146 | */ | |
1147 | ret = 0; | |
ffe60014 DG |
1148 | DBG3("UST app filter event failed. Application is dead."); |
1149 | } | |
53a80697 MD |
1150 | goto error; |
1151 | } | |
1152 | ||
1153 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
1154 | ||
1155 | error: | |
840cb59c | 1156 | health_code_update(); |
53a80697 MD |
1157 | return ret; |
1158 | } | |
1159 | ||
7cc9a73c JI |
1160 | /* |
1161 | * Set event exclusions on the tracer. | |
1162 | */ | |
1163 | static | |
1164 | int set_ust_event_exclusion(struct ust_app_event *ua_event, | |
1165 | struct ust_app *app) | |
1166 | { | |
1167 | int ret; | |
1168 | ||
1169 | health_code_update(); | |
1170 | ||
1171 | if (!ua_event->exclusion || !ua_event->exclusion->count) { | |
1172 | ret = 0; | |
1173 | goto error; | |
1174 | } | |
1175 | ||
1176 | ret = ustctl_set_exclusion(app->sock, ua_event->exclusion, | |
1177 | ua_event->obj); | |
1178 | if (ret < 0) { | |
1179 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1180 | ERR("UST app event %s exclusions failed for app (pid: %d) " | |
1181 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1182 | } else { | |
1183 | /* | |
1184 | * This is normal behavior, an application can die during the | |
1185 | * creation process. Don't report an error so the execution can | |
1186 | * continue normally. | |
1187 | */ | |
1188 | ret = 0; | |
1189 | DBG3("UST app event exclusion failed. Application is dead."); | |
1190 | } | |
1191 | goto error; | |
1192 | } | |
1193 | ||
1194 | DBG2("UST exclusion set successfully for event %s", ua_event->name); | |
1195 | ||
1196 | error: | |
1197 | health_code_update(); | |
1198 | return ret; | |
1199 | } | |
1200 | ||
9730260e DG |
1201 | /* |
1202 | * Disable the specified event on to UST tracer for the UST session. | |
1203 | */ | |
1204 | static int disable_ust_event(struct ust_app *app, | |
1205 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1206 | { | |
1207 | int ret; | |
1208 | ||
840cb59c | 1209 | health_code_update(); |
86acf0da | 1210 | |
852d0037 | 1211 | ret = ustctl_disable(app->sock, ua_event->obj); |
9730260e | 1212 | if (ret < 0) { |
ffe60014 DG |
1213 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1214 | ERR("UST app event %s disable failed for app (pid: %d) " | |
1215 | "and session handle %d with ret %d", | |
1216 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1217 | } else { | |
3757b385 DG |
1218 | /* |
1219 | * This is normal behavior, an application can die during the | |
1220 | * creation process. Don't report an error so the execution can | |
1221 | * continue normally. | |
1222 | */ | |
1223 | ret = 0; | |
ffe60014 DG |
1224 | DBG3("UST app disable event failed. Application is dead."); |
1225 | } | |
9730260e DG |
1226 | goto error; |
1227 | } | |
1228 | ||
1229 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 1230 | ua_event->attr.name, app->pid); |
9730260e DG |
1231 | |
1232 | error: | |
840cb59c | 1233 | health_code_update(); |
9730260e DG |
1234 | return ret; |
1235 | } | |
1236 | ||
78f0bacd DG |
1237 | /* |
1238 | * Disable the specified channel on to UST tracer for the UST session. | |
1239 | */ | |
1240 | static int disable_ust_channel(struct ust_app *app, | |
1241 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1242 | { | |
1243 | int ret; | |
1244 | ||
840cb59c | 1245 | health_code_update(); |
86acf0da | 1246 | |
852d0037 | 1247 | ret = ustctl_disable(app->sock, ua_chan->obj); |
78f0bacd | 1248 | if (ret < 0) { |
ffe60014 DG |
1249 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1250 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1251 | "and session handle %d with ret %d", | |
1252 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1253 | } else { | |
3757b385 DG |
1254 | /* |
1255 | * This is normal behavior, an application can die during the | |
1256 | * creation process. Don't report an error so the execution can | |
1257 | * continue normally. | |
1258 | */ | |
1259 | ret = 0; | |
ffe60014 DG |
1260 | DBG3("UST app disable channel failed. Application is dead."); |
1261 | } | |
78f0bacd DG |
1262 | goto error; |
1263 | } | |
1264 | ||
78f0bacd | 1265 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1266 | ua_chan->name, app->pid); |
78f0bacd DG |
1267 | |
1268 | error: | |
840cb59c | 1269 | health_code_update(); |
78f0bacd DG |
1270 | return ret; |
1271 | } | |
1272 | ||
1273 | /* | |
1274 | * Enable the specified channel on to UST tracer for the UST session. | |
1275 | */ | |
1276 | static int enable_ust_channel(struct ust_app *app, | |
1277 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1278 | { | |
1279 | int ret; | |
1280 | ||
840cb59c | 1281 | health_code_update(); |
86acf0da | 1282 | |
852d0037 | 1283 | ret = ustctl_enable(app->sock, ua_chan->obj); |
78f0bacd | 1284 | if (ret < 0) { |
ffe60014 DG |
1285 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1286 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1287 | "and session handle %d with ret %d", | |
1288 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1289 | } else { | |
3757b385 DG |
1290 | /* |
1291 | * This is normal behavior, an application can die during the | |
1292 | * creation process. Don't report an error so the execution can | |
1293 | * continue normally. | |
1294 | */ | |
1295 | ret = 0; | |
ffe60014 DG |
1296 | DBG3("UST app enable channel failed. Application is dead."); |
1297 | } | |
78f0bacd DG |
1298 | goto error; |
1299 | } | |
1300 | ||
1301 | ua_chan->enabled = 1; | |
1302 | ||
1303 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1304 | ua_chan->name, app->pid); |
78f0bacd DG |
1305 | |
1306 | error: | |
840cb59c | 1307 | health_code_update(); |
78f0bacd DG |
1308 | return ret; |
1309 | } | |
1310 | ||
edb67388 DG |
1311 | /* |
1312 | * Enable the specified event on to UST tracer for the UST session. | |
1313 | */ | |
1314 | static int enable_ust_event(struct ust_app *app, | |
1315 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1316 | { | |
1317 | int ret; | |
1318 | ||
840cb59c | 1319 | health_code_update(); |
86acf0da | 1320 | |
852d0037 | 1321 | ret = ustctl_enable(app->sock, ua_event->obj); |
edb67388 | 1322 | if (ret < 0) { |
ffe60014 DG |
1323 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1324 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1325 | "and session handle %d with ret %d", | |
1326 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1327 | } else { | |
3757b385 DG |
1328 | /* |
1329 | * This is normal behavior, an application can die during the | |
1330 | * creation process. Don't report an error so the execution can | |
1331 | * continue normally. | |
1332 | */ | |
1333 | ret = 0; | |
ffe60014 DG |
1334 | DBG3("UST app enable event failed. Application is dead."); |
1335 | } | |
edb67388 DG |
1336 | goto error; |
1337 | } | |
1338 | ||
1339 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1340 | ua_event->attr.name, app->pid); |
edb67388 DG |
1341 | |
1342 | error: | |
840cb59c | 1343 | health_code_update(); |
edb67388 DG |
1344 | return ret; |
1345 | } | |
1346 | ||
099e26bd | 1347 | /* |
7972aab2 | 1348 | * Send channel and stream buffer to application. |
4f3ab6ee | 1349 | * |
ffe60014 | 1350 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1351 | */ |
7972aab2 DG |
1352 | static int send_channel_pid_to_ust(struct ust_app *app, |
1353 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1354 | { |
1355 | int ret; | |
ffe60014 | 1356 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1357 | |
1358 | assert(app); | |
ffe60014 | 1359 | assert(ua_sess); |
4f3ab6ee | 1360 | assert(ua_chan); |
4f3ab6ee | 1361 | |
840cb59c | 1362 | health_code_update(); |
4f3ab6ee | 1363 | |
7972aab2 DG |
1364 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1365 | app->sock); | |
86acf0da | 1366 | |
ffe60014 DG |
1367 | /* Send channel to the application. */ |
1368 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
5b4a0ec0 | 1369 | if (ret < 0) { |
b551a063 DG |
1370 | goto error; |
1371 | } | |
1372 | ||
d88aee68 DG |
1373 | health_code_update(); |
1374 | ||
ffe60014 DG |
1375 | /* Send all streams to application. */ |
1376 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1377 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
1378 | if (ret < 0) { | |
1379 | goto error; | |
1380 | } | |
1381 | /* We don't need the stream anymore once sent to the tracer. */ | |
1382 | cds_list_del(&stream->list); | |
1383 | delete_ust_app_stream(-1, stream); | |
1384 | } | |
ffe60014 DG |
1385 | /* Flag the channel that it is sent to the application. */ |
1386 | ua_chan->is_sent = 1; | |
ffe60014 | 1387 | |
b551a063 | 1388 | error: |
840cb59c | 1389 | health_code_update(); |
b551a063 DG |
1390 | return ret; |
1391 | } | |
1392 | ||
91d76f53 | 1393 | /* |
5b4a0ec0 | 1394 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1395 | * |
1396 | * Should be called with session mutex held. | |
91d76f53 | 1397 | */ |
edb67388 DG |
1398 | static |
1399 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1400 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1401 | { |
5b4a0ec0 | 1402 | int ret = 0; |
284d8f55 | 1403 | |
840cb59c | 1404 | health_code_update(); |
86acf0da | 1405 | |
5b4a0ec0 | 1406 | /* Create UST event on tracer */ |
852d0037 | 1407 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 DG |
1408 | &ua_event->obj); |
1409 | if (ret < 0) { | |
ffe60014 DG |
1410 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1411 | ERR("Error ustctl create event %s for app pid: %d with ret %d", | |
1412 | ua_event->attr.name, app->pid, ret); | |
1413 | } else { | |
3757b385 DG |
1414 | /* |
1415 | * This is normal behavior, an application can die during the | |
1416 | * creation process. Don't report an error so the execution can | |
1417 | * continue normally. | |
1418 | */ | |
1419 | ret = 0; | |
ffe60014 DG |
1420 | DBG3("UST app create event failed. Application is dead."); |
1421 | } | |
5b4a0ec0 | 1422 | goto error; |
91d76f53 | 1423 | } |
f6a9efaa | 1424 | |
5b4a0ec0 | 1425 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1426 | |
5b4a0ec0 | 1427 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1428 | ua_event->attr.name, app->pid); |
f6a9efaa | 1429 | |
840cb59c | 1430 | health_code_update(); |
86acf0da | 1431 | |
025faf73 DG |
1432 | /* Set filter if one is present. */ |
1433 | if (ua_event->filter) { | |
1434 | ret = set_ust_event_filter(ua_event, app); | |
1435 | if (ret < 0) { | |
1436 | goto error; | |
1437 | } | |
1438 | } | |
1439 | ||
7cc9a73c JI |
1440 | /* Set exclusions for the event */ |
1441 | if (ua_event->exclusion) { | |
1442 | ret = set_ust_event_exclusion(ua_event, app); | |
1443 | if (ret < 0) { | |
1444 | goto error; | |
1445 | } | |
1446 | } | |
1447 | ||
8535a6d9 | 1448 | /* If event not enabled, disable it on the tracer */ |
3a400966 MD |
1449 | if (ua_event->enabled) { |
1450 | /* | |
1451 | * We now need to explicitly enable the event, since it | |
1452 | * is now disabled at creation. | |
1453 | */ | |
1454 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1455 | if (ret < 0) { | |
1456 | /* | |
1457 | * If we hit an EPERM, something is wrong with our enable call. If | |
1458 | * we get an EEXIST, there is a problem on the tracer side since we | |
1459 | * just created it. | |
1460 | */ | |
1461 | switch (ret) { | |
1462 | case -LTTNG_UST_ERR_PERM: | |
1463 | /* Code flow problem */ | |
1464 | assert(0); | |
1465 | case -LTTNG_UST_ERR_EXIST: | |
1466 | /* It's OK for our use case. */ | |
1467 | ret = 0; | |
1468 | break; | |
1469 | default: | |
1470 | break; | |
1471 | } | |
1472 | goto error; | |
1473 | } | |
1474 | } else { | |
8535a6d9 DG |
1475 | ret = disable_ust_event(app, ua_sess, ua_event); |
1476 | if (ret < 0) { | |
fc34caaa DG |
1477 | /* |
1478 | * If we hit an EPERM, something is wrong with our disable call. If | |
1479 | * we get an EEXIST, there is a problem on the tracer side since we | |
1480 | * just created it. | |
1481 | */ | |
1482 | switch (ret) { | |
49c336c1 | 1483 | case -LTTNG_UST_ERR_PERM: |
fc34caaa DG |
1484 | /* Code flow problem */ |
1485 | assert(0); | |
49c336c1 | 1486 | case -LTTNG_UST_ERR_EXIST: |
fc34caaa DG |
1487 | /* It's OK for our use case. */ |
1488 | ret = 0; | |
1489 | break; | |
1490 | default: | |
1491 | break; | |
1492 | } | |
8535a6d9 DG |
1493 | goto error; |
1494 | } | |
1495 | } | |
1496 | ||
5b4a0ec0 | 1497 | error: |
840cb59c | 1498 | health_code_update(); |
5b4a0ec0 | 1499 | return ret; |
91d76f53 | 1500 | } |
48842b30 | 1501 | |
5b4a0ec0 DG |
1502 | /* |
1503 | * Copy data between an UST app event and a LTT event. | |
1504 | */ | |
421cb601 | 1505 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1506 | struct ltt_ust_event *uevent) |
1507 | { | |
b4ffad32 JI |
1508 | size_t exclusion_alloc_size; |
1509 | ||
48842b30 DG |
1510 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); |
1511 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1512 | ||
fc34caaa DG |
1513 | ua_event->enabled = uevent->enabled; |
1514 | ||
5b4a0ec0 DG |
1515 | /* Copy event attributes */ |
1516 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1517 | ||
53a80697 MD |
1518 | /* Copy filter bytecode */ |
1519 | if (uevent->filter) { | |
025faf73 DG |
1520 | ua_event->filter = alloc_copy_ust_app_filter(uevent->filter); |
1521 | /* Filter might be NULL here in case of ENONEM. */ | |
53a80697 | 1522 | } |
b4ffad32 JI |
1523 | |
1524 | /* Copy exclusion data */ | |
1525 | if (uevent->exclusion) { | |
1526 | exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) + | |
1527 | LTTNG_UST_SYM_NAME_LEN * uevent->exclusion->count; | |
1528 | ua_event->exclusion = zmalloc(exclusion_alloc_size); | |
5f8df26c JI |
1529 | if (ua_event->exclusion == NULL) { |
1530 | PERROR("malloc"); | |
1531 | } else { | |
1532 | memcpy(ua_event->exclusion, uevent->exclusion, | |
1533 | exclusion_alloc_size); | |
b4ffad32 JI |
1534 | } |
1535 | } | |
48842b30 DG |
1536 | } |
1537 | ||
5b4a0ec0 DG |
1538 | /* |
1539 | * Copy data between an UST app channel and a LTT channel. | |
1540 | */ | |
421cb601 | 1541 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1542 | struct ltt_ust_channel *uchan) |
1543 | { | |
bec39940 | 1544 | struct lttng_ht_iter iter; |
48842b30 | 1545 | struct ltt_ust_event *uevent; |
55cc08a6 | 1546 | struct ltt_ust_context *uctx; |
48842b30 | 1547 | struct ust_app_event *ua_event; |
55cc08a6 | 1548 | struct ust_app_ctx *ua_ctx; |
48842b30 | 1549 | |
fc34caaa | 1550 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1551 | |
1552 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1553 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 1554 | |
1624d5b7 JD |
1555 | ua_chan->tracefile_size = uchan->tracefile_size; |
1556 | ua_chan->tracefile_count = uchan->tracefile_count; | |
1557 | ||
ffe60014 DG |
1558 | /* Copy event attributes since the layout is different. */ |
1559 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1560 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1561 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1562 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1563 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
1564 | ua_chan->attr.output = uchan->attr.output; | |
1565 | /* | |
1566 | * Note that the attribute channel type is not set since the channel on the | |
1567 | * tracing registry side does not have this information. | |
1568 | */ | |
48842b30 | 1569 | |
fc34caaa | 1570 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1571 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1572 | |
31746f93 | 1573 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { |
55cc08a6 DG |
1574 | ua_ctx = alloc_ust_app_ctx(&uctx->ctx); |
1575 | if (ua_ctx == NULL) { | |
1576 | continue; | |
1577 | } | |
bec39940 DG |
1578 | lttng_ht_node_init_ulong(&ua_ctx->node, |
1579 | (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 1580 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 1581 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
55cc08a6 | 1582 | } |
48842b30 | 1583 | |
421cb601 | 1584 | /* Copy all events from ltt ust channel to ust app channel */ |
bec39940 | 1585 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
18eace3b | 1586 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 1587 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 1588 | if (ua_event == NULL) { |
421cb601 | 1589 | DBG2("UST event %s not found on shadow copy channel", |
48842b30 | 1590 | uevent->attr.name); |
284d8f55 | 1591 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
48842b30 | 1592 | if (ua_event == NULL) { |
5b4a0ec0 | 1593 | continue; |
48842b30 | 1594 | } |
421cb601 | 1595 | shadow_copy_event(ua_event, uevent); |
d0b96690 | 1596 | add_unique_ust_app_event(ua_chan, ua_event); |
48842b30 | 1597 | } |
48842b30 DG |
1598 | } |
1599 | ||
fc34caaa | 1600 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1601 | } |
1602 | ||
5b4a0ec0 DG |
1603 | /* |
1604 | * Copy data between a UST app session and a regular LTT session. | |
1605 | */ | |
421cb601 | 1606 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1607 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1608 | { |
bec39940 DG |
1609 | struct lttng_ht_node_str *ua_chan_node; |
1610 | struct lttng_ht_iter iter; | |
48842b30 DG |
1611 | struct ltt_ust_channel *uchan; |
1612 | struct ust_app_channel *ua_chan; | |
477d7741 MD |
1613 | time_t rawtime; |
1614 | struct tm *timeinfo; | |
1615 | char datetime[16]; | |
1616 | int ret; | |
1617 | ||
1618 | /* Get date and time for unique app path */ | |
1619 | time(&rawtime); | |
1620 | timeinfo = localtime(&rawtime); | |
1621 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1622 | |
421cb601 | 1623 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1624 | |
7972aab2 DG |
1625 | ua_sess->tracing_id = usess->id; |
1626 | ua_sess->id = get_next_session_id(); | |
1627 | ua_sess->uid = app->uid; | |
1628 | ua_sess->gid = app->gid; | |
1629 | ua_sess->euid = usess->uid; | |
1630 | ua_sess->egid = usess->gid; | |
1631 | ua_sess->buffer_type = usess->buffer_type; | |
1632 | ua_sess->bits_per_long = app->bits_per_long; | |
1633 | /* There is only one consumer object per session possible. */ | |
1634 | ua_sess->consumer = usess->consumer; | |
2bba9e53 | 1635 | ua_sess->output_traces = usess->output_traces; |
ecc48a90 | 1636 | ua_sess->live_timer_interval = usess->live_timer_interval; |
84ad93e8 DG |
1637 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, |
1638 | &usess->metadata_attr); | |
7972aab2 DG |
1639 | |
1640 | switch (ua_sess->buffer_type) { | |
1641 | case LTTNG_BUFFER_PER_PID: | |
1642 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 1643 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
1644 | datetime); |
1645 | break; | |
1646 | case LTTNG_BUFFER_PER_UID: | |
1647 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1648 | DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long); | |
1649 | break; | |
1650 | default: | |
1651 | assert(0); | |
1652 | goto error; | |
1653 | } | |
477d7741 MD |
1654 | if (ret < 0) { |
1655 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1656 | assert(0); |
7972aab2 | 1657 | goto error; |
477d7741 MD |
1658 | } |
1659 | ||
48842b30 | 1660 | /* Iterate over all channels in global domain. */ |
bec39940 DG |
1661 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, |
1662 | uchan, node.node) { | |
1663 | struct lttng_ht_iter uiter; | |
ba767faf | 1664 | |
bec39940 DG |
1665 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
1666 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
5b4a0ec0 | 1667 | if (ua_chan_node != NULL) { |
fc34caaa | 1668 | /* Session exist. Contiuing. */ |
5b4a0ec0 DG |
1669 | continue; |
1670 | } | |
421cb601 | 1671 | |
5b4a0ec0 DG |
1672 | DBG2("Channel %s not found on shadow session copy, creating it", |
1673 | uchan->name); | |
d0b96690 | 1674 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
5b4a0ec0 | 1675 | if (ua_chan == NULL) { |
fc34caaa | 1676 | /* malloc failed FIXME: Might want to do handle ENOMEM .. */ |
5b4a0ec0 | 1677 | continue; |
48842b30 | 1678 | } |
5b4a0ec0 | 1679 | shadow_copy_channel(ua_chan, uchan); |
ffe60014 DG |
1680 | /* |
1681 | * The concept of metadata channel does not exist on the tracing | |
1682 | * registry side of the session daemon so this can only be a per CPU | |
1683 | * channel and not metadata. | |
1684 | */ | |
1685 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
1686 | ||
bec39940 | 1687 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); |
48842b30 | 1688 | } |
7972aab2 DG |
1689 | |
1690 | error: | |
1691 | return; | |
48842b30 DG |
1692 | } |
1693 | ||
78f0bacd DG |
1694 | /* |
1695 | * Lookup sesison wrapper. | |
1696 | */ | |
84cd17c6 MD |
1697 | static |
1698 | void __lookup_session_by_app(struct ltt_ust_session *usess, | |
bec39940 | 1699 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1700 | { |
1701 | /* Get right UST app session from app */ | |
d9bf3ca4 | 1702 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
1703 | } |
1704 | ||
421cb601 DG |
1705 | /* |
1706 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1707 | * id. |
421cb601 | 1708 | */ |
48842b30 DG |
1709 | static struct ust_app_session *lookup_session_by_app( |
1710 | struct ltt_ust_session *usess, struct ust_app *app) | |
1711 | { | |
bec39940 | 1712 | struct lttng_ht_iter iter; |
d9bf3ca4 | 1713 | struct lttng_ht_node_u64 *node; |
48842b30 | 1714 | |
84cd17c6 | 1715 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 1716 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
1717 | if (node == NULL) { |
1718 | goto error; | |
1719 | } | |
1720 | ||
1721 | return caa_container_of(node, struct ust_app_session, node); | |
1722 | ||
1723 | error: | |
1724 | return NULL; | |
1725 | } | |
1726 | ||
7972aab2 DG |
1727 | /* |
1728 | * Setup buffer registry per PID for the given session and application. If none | |
1729 | * is found, a new one is created, added to the global registry and | |
1730 | * initialized. If regp is valid, it's set with the newly created object. | |
1731 | * | |
1732 | * Return 0 on success or else a negative value. | |
1733 | */ | |
1734 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
1735 | struct ust_app *app, struct buffer_reg_pid **regp) | |
1736 | { | |
1737 | int ret = 0; | |
1738 | struct buffer_reg_pid *reg_pid; | |
1739 | ||
1740 | assert(ua_sess); | |
1741 | assert(app); | |
1742 | ||
1743 | rcu_read_lock(); | |
1744 | ||
1745 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
1746 | if (!reg_pid) { | |
1747 | /* | |
1748 | * This is the create channel path meaning that if there is NO | |
1749 | * registry available, we have to create one for this session. | |
1750 | */ | |
1751 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid); | |
1752 | if (ret < 0) { | |
1753 | goto error; | |
1754 | } | |
1755 | buffer_reg_pid_add(reg_pid); | |
1756 | } else { | |
1757 | goto end; | |
1758 | } | |
1759 | ||
1760 | /* Initialize registry. */ | |
1761 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
1762 | app->bits_per_long, app->uint8_t_alignment, | |
1763 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1764 | app->uint64_t_alignment, app->long_alignment, |
1765 | app->byte_order, app->version.major, | |
1766 | app->version.minor); | |
7972aab2 DG |
1767 | if (ret < 0) { |
1768 | goto error; | |
1769 | } | |
1770 | ||
1771 | DBG3("UST app buffer registry per PID created successfully"); | |
1772 | ||
1773 | end: | |
1774 | if (regp) { | |
1775 | *regp = reg_pid; | |
1776 | } | |
1777 | error: | |
1778 | rcu_read_unlock(); | |
1779 | return ret; | |
1780 | } | |
1781 | ||
1782 | /* | |
1783 | * Setup buffer registry per UID for the given session and application. If none | |
1784 | * is found, a new one is created, added to the global registry and | |
1785 | * initialized. If regp is valid, it's set with the newly created object. | |
1786 | * | |
1787 | * Return 0 on success or else a negative value. | |
1788 | */ | |
1789 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
1790 | struct ust_app *app, struct buffer_reg_uid **regp) | |
1791 | { | |
1792 | int ret = 0; | |
1793 | struct buffer_reg_uid *reg_uid; | |
1794 | ||
1795 | assert(usess); | |
1796 | assert(app); | |
1797 | ||
1798 | rcu_read_lock(); | |
1799 | ||
1800 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
1801 | if (!reg_uid) { | |
1802 | /* | |
1803 | * This is the create channel path meaning that if there is NO | |
1804 | * registry available, we have to create one for this session. | |
1805 | */ | |
1806 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
1807 | LTTNG_DOMAIN_UST, ®_uid); | |
1808 | if (ret < 0) { | |
1809 | goto error; | |
1810 | } | |
1811 | buffer_reg_uid_add(reg_uid); | |
1812 | } else { | |
1813 | goto end; | |
1814 | } | |
1815 | ||
1816 | /* Initialize registry. */ | |
af6142cf | 1817 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
1818 | app->bits_per_long, app->uint8_t_alignment, |
1819 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1820 | app->uint64_t_alignment, app->long_alignment, |
1821 | app->byte_order, app->version.major, | |
1822 | app->version.minor); | |
7972aab2 DG |
1823 | if (ret < 0) { |
1824 | goto error; | |
1825 | } | |
1826 | /* Add node to teardown list of the session. */ | |
1827 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
1828 | ||
1829 | DBG3("UST app buffer registry per UID created successfully"); | |
1830 | ||
1831 | end: | |
1832 | if (regp) { | |
1833 | *regp = reg_uid; | |
1834 | } | |
1835 | error: | |
1836 | rcu_read_unlock(); | |
1837 | return ret; | |
1838 | } | |
1839 | ||
421cb601 | 1840 | /* |
3d8ca23b | 1841 | * Create a session on the tracer side for the given app. |
421cb601 | 1842 | * |
3d8ca23b DG |
1843 | * On success, ua_sess_ptr is populated with the session pointer or else left |
1844 | * untouched. If the session was created, is_created is set to 1. On error, | |
1845 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
1846 | * be NULL. | |
1847 | * | |
1848 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
1849 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 1850 | */ |
3d8ca23b DG |
1851 | static int create_ust_app_session(struct ltt_ust_session *usess, |
1852 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, | |
1853 | int *is_created) | |
421cb601 | 1854 | { |
3d8ca23b | 1855 | int ret, created = 0; |
421cb601 DG |
1856 | struct ust_app_session *ua_sess; |
1857 | ||
3d8ca23b DG |
1858 | assert(usess); |
1859 | assert(app); | |
1860 | assert(ua_sess_ptr); | |
1861 | ||
840cb59c | 1862 | health_code_update(); |
86acf0da | 1863 | |
421cb601 DG |
1864 | ua_sess = lookup_session_by_app(usess, app); |
1865 | if (ua_sess == NULL) { | |
d9bf3ca4 | 1866 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 1867 | app->pid, usess->id); |
d0b96690 | 1868 | ua_sess = alloc_ust_app_session(app); |
421cb601 DG |
1869 | if (ua_sess == NULL) { |
1870 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
1871 | ret = -ENOMEM; |
1872 | goto error; | |
421cb601 | 1873 | } |
477d7741 | 1874 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 1875 | created = 1; |
421cb601 DG |
1876 | } |
1877 | ||
7972aab2 DG |
1878 | switch (usess->buffer_type) { |
1879 | case LTTNG_BUFFER_PER_PID: | |
1880 | /* Init local registry. */ | |
1881 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 1882 | if (ret < 0) { |
7972aab2 DG |
1883 | goto error; |
1884 | } | |
1885 | break; | |
1886 | case LTTNG_BUFFER_PER_UID: | |
1887 | /* Look for a global registry. If none exists, create one. */ | |
1888 | ret = setup_buffer_reg_uid(usess, app, NULL); | |
1889 | if (ret < 0) { | |
1890 | goto error; | |
1891 | } | |
1892 | break; | |
1893 | default: | |
1894 | assert(0); | |
1895 | ret = -EINVAL; | |
1896 | goto error; | |
1897 | } | |
1898 | ||
1899 | health_code_update(); | |
1900 | ||
1901 | if (ua_sess->handle == -1) { | |
1902 | ret = ustctl_create_session(app->sock); | |
1903 | if (ret < 0) { | |
1904 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1905 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
1906 | app->pid, ret); |
1907 | } else { | |
1908 | DBG("UST app creating session failed. Application is dead"); | |
3757b385 DG |
1909 | /* |
1910 | * This is normal behavior, an application can die during the | |
1911 | * creation process. Don't report an error so the execution can | |
1912 | * continue normally. This will get flagged ENOTCONN and the | |
1913 | * caller will handle it. | |
1914 | */ | |
1915 | ret = 0; | |
ffe60014 | 1916 | } |
d0b96690 | 1917 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
1918 | if (ret != -ENOMEM) { |
1919 | /* | |
1920 | * Tracer is probably gone or got an internal error so let's | |
1921 | * behave like it will soon unregister or not usable. | |
1922 | */ | |
1923 | ret = -ENOTCONN; | |
1924 | } | |
1925 | goto error; | |
421cb601 DG |
1926 | } |
1927 | ||
7972aab2 DG |
1928 | ua_sess->handle = ret; |
1929 | ||
1930 | /* Add ust app session to app's HT */ | |
d9bf3ca4 MD |
1931 | lttng_ht_node_init_u64(&ua_sess->node, |
1932 | ua_sess->tracing_id); | |
1933 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
7972aab2 DG |
1934 | |
1935 | DBG2("UST app session created successfully with handle %d", ret); | |
1936 | } | |
1937 | ||
1938 | *ua_sess_ptr = ua_sess; | |
1939 | if (is_created) { | |
1940 | *is_created = created; | |
1941 | } | |
1942 | ||
1943 | /* Everything went well. */ | |
1944 | ret = 0; | |
1945 | ||
1946 | error: | |
1947 | health_code_update(); | |
1948 | return ret; | |
1949 | } | |
1950 | ||
394235f5 JG |
1951 | /* |
1952 | * Match function for a hash table lookup of ust_app_ctx. | |
1953 | * | |
1954 | * It matches an ust app context based on the context type and, in the case | |
1955 | * of perf counters, their name. | |
1956 | */ | |
1957 | static int ht_match_ust_app_ctx(struct cds_lfht_node *node, const void *_key) | |
1958 | { | |
1959 | struct ust_app_ctx *ctx; | |
1960 | const struct lttng_ust_context *key; | |
1961 | ||
1962 | assert(node); | |
1963 | assert(_key); | |
1964 | ||
1965 | ctx = caa_container_of(node, struct ust_app_ctx, node.node); | |
1966 | key = _key; | |
1967 | ||
1968 | /* Context type */ | |
1969 | if (ctx->ctx.ctx != key->ctx) { | |
1970 | goto no_match; | |
1971 | } | |
1972 | ||
1973 | /* Check the name in the case of perf thread counters. */ | |
1974 | if (key->ctx == LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER) { | |
1975 | if (strncmp(key->u.perf_counter.name, | |
1976 | ctx->ctx.u.perf_counter.name, | |
1977 | sizeof(key->u.perf_counter.name))) { | |
1978 | goto no_match; | |
1979 | } | |
1980 | } | |
1981 | ||
1982 | /* Match. */ | |
1983 | return 1; | |
1984 | ||
1985 | no_match: | |
1986 | return 0; | |
1987 | } | |
1988 | ||
1989 | /* | |
1990 | * Lookup for an ust app context from an lttng_ust_context. | |
1991 | * | |
a4b56f4f | 1992 | * Must be called while holding RCU read side lock. |
394235f5 JG |
1993 | * Return an ust_app_ctx object or NULL on error. |
1994 | */ | |
1995 | static | |
1996 | struct ust_app_ctx *find_ust_app_context(struct lttng_ht *ht, | |
1997 | struct lttng_ust_context *uctx) | |
1998 | { | |
1999 | struct lttng_ht_iter iter; | |
2000 | struct lttng_ht_node_ulong *node; | |
2001 | struct ust_app_ctx *app_ctx = NULL; | |
2002 | ||
2003 | assert(uctx); | |
2004 | assert(ht); | |
2005 | ||
2006 | /* Lookup using the lttng_ust_context_type and a custom match fct. */ | |
2007 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) uctx->ctx, lttng_ht_seed), | |
2008 | ht_match_ust_app_ctx, uctx, &iter.iter); | |
2009 | node = lttng_ht_iter_get_node_ulong(&iter); | |
2010 | if (!node) { | |
2011 | goto end; | |
2012 | } | |
2013 | ||
2014 | app_ctx = caa_container_of(node, struct ust_app_ctx, node); | |
2015 | ||
2016 | end: | |
2017 | return app_ctx; | |
2018 | } | |
2019 | ||
7972aab2 DG |
2020 | /* |
2021 | * Create a context for the channel on the tracer. | |
2022 | * | |
2023 | * Called with UST app session lock held and a RCU read side lock. | |
2024 | */ | |
2025 | static | |
2026 | int create_ust_app_channel_context(struct ust_app_session *ua_sess, | |
2027 | struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx, | |
2028 | struct ust_app *app) | |
2029 | { | |
2030 | int ret = 0; | |
7972aab2 DG |
2031 | struct ust_app_ctx *ua_ctx; |
2032 | ||
2033 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
2034 | ||
394235f5 JG |
2035 | ua_ctx = find_ust_app_context(ua_chan->ctx, uctx); |
2036 | if (ua_ctx) { | |
7972aab2 DG |
2037 | ret = -EEXIST; |
2038 | goto error; | |
2039 | } | |
2040 | ||
2041 | ua_ctx = alloc_ust_app_ctx(uctx); | |
2042 | if (ua_ctx == NULL) { | |
2043 | /* malloc failed */ | |
2044 | ret = -1; | |
2045 | goto error; | |
2046 | } | |
2047 | ||
2048 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 2049 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 2050 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
2051 | |
2052 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
2053 | if (ret < 0) { | |
2054 | goto error; | |
2055 | } | |
2056 | ||
2057 | error: | |
2058 | return ret; | |
2059 | } | |
2060 | ||
2061 | /* | |
2062 | * Enable on the tracer side a ust app event for the session and channel. | |
2063 | * | |
2064 | * Called with UST app session lock held. | |
2065 | */ | |
2066 | static | |
2067 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
2068 | struct ust_app_event *ua_event, struct ust_app *app) | |
2069 | { | |
2070 | int ret; | |
2071 | ||
2072 | ret = enable_ust_event(app, ua_sess, ua_event); | |
2073 | if (ret < 0) { | |
2074 | goto error; | |
2075 | } | |
2076 | ||
2077 | ua_event->enabled = 1; | |
2078 | ||
2079 | error: | |
2080 | return ret; | |
2081 | } | |
2082 | ||
2083 | /* | |
2084 | * Disable on the tracer side a ust app event for the session and channel. | |
2085 | */ | |
2086 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
2087 | struct ust_app_event *ua_event, struct ust_app *app) | |
2088 | { | |
2089 | int ret; | |
2090 | ||
2091 | ret = disable_ust_event(app, ua_sess, ua_event); | |
2092 | if (ret < 0) { | |
2093 | goto error; | |
2094 | } | |
2095 | ||
2096 | ua_event->enabled = 0; | |
2097 | ||
2098 | error: | |
2099 | return ret; | |
2100 | } | |
2101 | ||
2102 | /* | |
2103 | * Lookup ust app channel for session and disable it on the tracer side. | |
2104 | */ | |
2105 | static | |
2106 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
2107 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
2108 | { | |
2109 | int ret; | |
2110 | ||
2111 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2112 | if (ret < 0) { | |
2113 | goto error; | |
2114 | } | |
2115 | ||
2116 | ua_chan->enabled = 0; | |
2117 | ||
2118 | error: | |
2119 | return ret; | |
2120 | } | |
2121 | ||
2122 | /* | |
2123 | * Lookup ust app channel for session and enable it on the tracer side. This | |
2124 | * MUST be called with a RCU read side lock acquired. | |
2125 | */ | |
2126 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
2127 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
2128 | { | |
2129 | int ret = 0; | |
2130 | struct lttng_ht_iter iter; | |
2131 | struct lttng_ht_node_str *ua_chan_node; | |
2132 | struct ust_app_channel *ua_chan; | |
2133 | ||
2134 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
2135 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
2136 | if (ua_chan_node == NULL) { | |
d9bf3ca4 | 2137 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
2138 | uchan->name, ua_sess->tracing_id); |
2139 | goto error; | |
2140 | } | |
2141 | ||
2142 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2143 | ||
2144 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
2145 | if (ret < 0) { | |
2146 | goto error; | |
2147 | } | |
2148 | ||
2149 | error: | |
2150 | return ret; | |
2151 | } | |
2152 | ||
2153 | /* | |
2154 | * Ask the consumer to create a channel and get it if successful. | |
2155 | * | |
2156 | * Return 0 on success or else a negative value. | |
2157 | */ | |
2158 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
2159 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
2160 | int bitness, struct ust_registry_session *registry) | |
2161 | { | |
2162 | int ret; | |
2163 | unsigned int nb_fd = 0; | |
2164 | struct consumer_socket *socket; | |
2165 | ||
2166 | assert(usess); | |
2167 | assert(ua_sess); | |
2168 | assert(ua_chan); | |
2169 | assert(registry); | |
2170 | ||
2171 | rcu_read_lock(); | |
2172 | health_code_update(); | |
2173 | ||
2174 | /* Get the right consumer socket for the application. */ | |
2175 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
2176 | if (!socket) { | |
2177 | ret = -EINVAL; | |
2178 | goto error; | |
2179 | } | |
2180 | ||
2181 | health_code_update(); | |
2182 | ||
2183 | /* Need one fd for the channel. */ | |
2184 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2185 | if (ret < 0) { | |
2186 | ERR("Exhausted number of available FD upon create channel"); | |
2187 | goto error; | |
2188 | } | |
2189 | ||
2190 | /* | |
2191 | * Ask consumer to create channel. The consumer will return the number of | |
2192 | * stream we have to expect. | |
2193 | */ | |
2194 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
2195 | registry); | |
2196 | if (ret < 0) { | |
2197 | goto error_ask; | |
2198 | } | |
2199 | ||
2200 | /* | |
2201 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2202 | * stream (2 being the default value here). | |
2203 | */ | |
2204 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2205 | ||
2206 | /* Reserve the amount of file descriptor we need. */ | |
2207 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2208 | if (ret < 0) { | |
2209 | ERR("Exhausted number of available FD upon create channel"); | |
2210 | goto error_fd_get_stream; | |
2211 | } | |
2212 | ||
2213 | health_code_update(); | |
2214 | ||
2215 | /* | |
2216 | * Now get the channel from the consumer. This call wil populate the stream | |
2217 | * list of that channel and set the ust objects. | |
2218 | */ | |
d9078d0c DG |
2219 | if (usess->consumer->enabled) { |
2220 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2221 | if (ret < 0) { | |
2222 | goto error_destroy; | |
2223 | } | |
7972aab2 DG |
2224 | } |
2225 | ||
2226 | rcu_read_unlock(); | |
2227 | return 0; | |
2228 | ||
2229 | error_destroy: | |
2230 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2231 | error_fd_get_stream: | |
2232 | /* | |
2233 | * Initiate a destroy channel on the consumer since we had an error | |
2234 | * handling it on our side. The return value is of no importance since we | |
2235 | * already have a ret value set by the previous error that we need to | |
2236 | * return. | |
2237 | */ | |
2238 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2239 | error_ask: | |
2240 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2241 | error: | |
2242 | health_code_update(); | |
2243 | rcu_read_unlock(); | |
2244 | return ret; | |
2245 | } | |
2246 | ||
2247 | /* | |
2248 | * Duplicate the ust data object of the ust app stream and save it in the | |
2249 | * buffer registry stream. | |
2250 | * | |
2251 | * Return 0 on success or else a negative value. | |
2252 | */ | |
2253 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2254 | struct ust_app_stream *stream) | |
2255 | { | |
2256 | int ret; | |
2257 | ||
2258 | assert(reg_stream); | |
2259 | assert(stream); | |
2260 | ||
2261 | /* Reserve the amount of file descriptor we need. */ | |
2262 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2263 | if (ret < 0) { | |
2264 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2265 | goto error; | |
2266 | } | |
2267 | ||
2268 | /* Duplicate object for stream once the original is in the registry. */ | |
2269 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2270 | reg_stream->obj.ust); | |
2271 | if (ret < 0) { | |
2272 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2273 | reg_stream->obj.ust, stream->obj, ret); | |
2274 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2275 | goto error; | |
2276 | } | |
2277 | stream->handle = stream->obj->handle; | |
2278 | ||
2279 | error: | |
2280 | return ret; | |
2281 | } | |
2282 | ||
2283 | /* | |
2284 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2285 | * buffer registry channel. | |
2286 | * | |
2287 | * Return 0 on success or else a negative value. | |
2288 | */ | |
2289 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2290 | struct ust_app_channel *ua_chan) | |
2291 | { | |
2292 | int ret; | |
2293 | ||
2294 | assert(reg_chan); | |
2295 | assert(ua_chan); | |
2296 | ||
2297 | /* Need two fds for the channel. */ | |
2298 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2299 | if (ret < 0) { | |
2300 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2301 | goto error_fd_get; | |
2302 | } | |
2303 | ||
2304 | /* Duplicate object for stream once the original is in the registry. */ | |
2305 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2306 | if (ret < 0) { | |
2307 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2308 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2309 | goto error; | |
2310 | } | |
2311 | ua_chan->handle = ua_chan->obj->handle; | |
2312 | ||
2313 | return 0; | |
2314 | ||
2315 | error: | |
2316 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2317 | error_fd_get: | |
2318 | return ret; | |
2319 | } | |
2320 | ||
2321 | /* | |
2322 | * For a given channel buffer registry, setup all streams of the given ust | |
2323 | * application channel. | |
2324 | * | |
2325 | * Return 0 on success or else a negative value. | |
2326 | */ | |
2327 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
2328 | struct ust_app_channel *ua_chan) | |
2329 | { | |
2330 | int ret = 0; | |
2331 | struct ust_app_stream *stream, *stmp; | |
2332 | ||
2333 | assert(reg_chan); | |
2334 | assert(ua_chan); | |
2335 | ||
2336 | DBG2("UST app setup buffer registry stream"); | |
2337 | ||
2338 | /* Send all streams to application. */ | |
2339 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2340 | struct buffer_reg_stream *reg_stream; | |
2341 | ||
2342 | ret = buffer_reg_stream_create(®_stream); | |
2343 | if (ret < 0) { | |
2344 | goto error; | |
2345 | } | |
2346 | ||
2347 | /* | |
2348 | * Keep original pointer and nullify it in the stream so the delete | |
2349 | * stream call does not release the object. | |
2350 | */ | |
2351 | reg_stream->obj.ust = stream->obj; | |
2352 | stream->obj = NULL; | |
2353 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2354 | |
7972aab2 DG |
2355 | /* We don't need the streams anymore. */ |
2356 | cds_list_del(&stream->list); | |
2357 | delete_ust_app_stream(-1, stream); | |
2358 | } | |
421cb601 | 2359 | |
7972aab2 DG |
2360 | error: |
2361 | return ret; | |
2362 | } | |
2363 | ||
2364 | /* | |
2365 | * Create a buffer registry channel for the given session registry and | |
2366 | * application channel object. If regp pointer is valid, it's set with the | |
2367 | * created object. Important, the created object is NOT added to the session | |
2368 | * registry hash table. | |
2369 | * | |
2370 | * Return 0 on success else a negative value. | |
2371 | */ | |
2372 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2373 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2374 | { | |
2375 | int ret; | |
2376 | struct buffer_reg_channel *reg_chan = NULL; | |
2377 | ||
2378 | assert(reg_sess); | |
2379 | assert(ua_chan); | |
2380 | ||
2381 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2382 | ||
2383 | /* Create buffer registry channel. */ | |
2384 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2385 | if (ret < 0) { | |
2386 | goto error_create; | |
421cb601 | 2387 | } |
7972aab2 DG |
2388 | assert(reg_chan); |
2389 | reg_chan->consumer_key = ua_chan->key; | |
8c924c7b | 2390 | reg_chan->subbuf_size = ua_chan->attr.subbuf_size; |
135347bd | 2391 | reg_chan->num_subbuf = ua_chan->attr.num_subbuf; |
421cb601 | 2392 | |
7972aab2 DG |
2393 | /* Create and add a channel registry to session. */ |
2394 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2395 | ua_chan->tracing_channel_id); | |
2396 | if (ret < 0) { | |
2397 | goto error; | |
d88aee68 | 2398 | } |
7972aab2 | 2399 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2400 | |
7972aab2 DG |
2401 | if (regp) { |
2402 | *regp = reg_chan; | |
3d8ca23b | 2403 | } |
d88aee68 | 2404 | |
7972aab2 | 2405 | return 0; |
3d8ca23b DG |
2406 | |
2407 | error: | |
7972aab2 DG |
2408 | /* Safe because the registry channel object was not added to any HT. */ |
2409 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2410 | error_create: | |
3d8ca23b | 2411 | return ret; |
421cb601 DG |
2412 | } |
2413 | ||
55cc08a6 | 2414 | /* |
7972aab2 DG |
2415 | * Setup buffer registry channel for the given session registry and application |
2416 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2417 | * |
7972aab2 | 2418 | * Return 0 on success else a negative value. |
55cc08a6 | 2419 | */ |
7972aab2 DG |
2420 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
2421 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan) | |
55cc08a6 | 2422 | { |
7972aab2 | 2423 | int ret; |
55cc08a6 | 2424 | |
7972aab2 DG |
2425 | assert(reg_sess); |
2426 | assert(reg_chan); | |
2427 | assert(ua_chan); | |
2428 | assert(ua_chan->obj); | |
55cc08a6 | 2429 | |
7972aab2 | 2430 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2431 | |
7972aab2 DG |
2432 | /* Setup all streams for the registry. */ |
2433 | ret = setup_buffer_reg_streams(reg_chan, ua_chan); | |
2434 | if (ret < 0) { | |
55cc08a6 DG |
2435 | goto error; |
2436 | } | |
2437 | ||
7972aab2 DG |
2438 | reg_chan->obj.ust = ua_chan->obj; |
2439 | ua_chan->obj = NULL; | |
55cc08a6 | 2440 | |
7972aab2 | 2441 | return 0; |
55cc08a6 DG |
2442 | |
2443 | error: | |
7972aab2 DG |
2444 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2445 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2446 | return ret; |
2447 | } | |
2448 | ||
edb67388 | 2449 | /* |
7972aab2 | 2450 | * Send buffer registry channel to the application. |
d0b96690 | 2451 | * |
7972aab2 | 2452 | * Return 0 on success else a negative value. |
edb67388 | 2453 | */ |
7972aab2 DG |
2454 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2455 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2456 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2457 | { |
2458 | int ret; | |
7972aab2 | 2459 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2460 | |
7972aab2 DG |
2461 | assert(reg_chan); |
2462 | assert(app); | |
2463 | assert(ua_sess); | |
2464 | assert(ua_chan); | |
2465 | ||
2466 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2467 | ||
2468 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2469 | if (ret < 0) { |
2470 | goto error; | |
2471 | } | |
2472 | ||
7972aab2 DG |
2473 | /* Send channel to the application. */ |
2474 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
2475 | if (ret < 0) { | |
2476 | goto error; | |
2477 | } | |
2478 | ||
2479 | health_code_update(); | |
2480 | ||
2481 | /* Send all streams to application. */ | |
2482 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2483 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2484 | struct ust_app_stream stream; | |
2485 | ||
2486 | ret = duplicate_stream_object(reg_stream, &stream); | |
2487 | if (ret < 0) { | |
2488 | goto error_stream_unlock; | |
2489 | } | |
2490 | ||
2491 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2492 | if (ret < 0) { | |
8c067051 | 2493 | (void) release_ust_app_stream(-1, &stream); |
7972aab2 DG |
2494 | goto error_stream_unlock; |
2495 | } | |
edb67388 | 2496 | |
7972aab2 DG |
2497 | /* |
2498 | * The return value is not important here. This function will output an | |
2499 | * error if needed. | |
2500 | */ | |
2501 | (void) release_ust_app_stream(-1, &stream); | |
2502 | } | |
2503 | ua_chan->is_sent = 1; | |
2504 | ||
2505 | error_stream_unlock: | |
2506 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2507 | error: |
2508 | return ret; | |
2509 | } | |
2510 | ||
9730260e | 2511 | /* |
7972aab2 DG |
2512 | * Create and send to the application the created buffers with per UID buffers. |
2513 | * | |
2514 | * Return 0 on success else a negative value. | |
9730260e | 2515 | */ |
7972aab2 DG |
2516 | static int create_channel_per_uid(struct ust_app *app, |
2517 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2518 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2519 | { |
2520 | int ret; | |
7972aab2 DG |
2521 | struct buffer_reg_uid *reg_uid; |
2522 | struct buffer_reg_channel *reg_chan; | |
9730260e | 2523 | |
7972aab2 DG |
2524 | assert(app); |
2525 | assert(usess); | |
2526 | assert(ua_sess); | |
2527 | assert(ua_chan); | |
2528 | ||
2529 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2530 | ||
2531 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2532 | /* | |
2533 | * The session creation handles the creation of this global registry | |
2534 | * object. If none can be find, there is a code flow problem or a | |
2535 | * teardown race. | |
2536 | */ | |
2537 | assert(reg_uid); | |
2538 | ||
2539 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2540 | reg_uid); | |
2541 | if (!reg_chan) { | |
2542 | /* Create the buffer registry channel object. */ | |
2543 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2544 | if (ret < 0) { | |
f14256d6 MD |
2545 | ERR("Error creating the UST channel \"%s\" registry instance", |
2546 | ua_chan->name); | |
7972aab2 DG |
2547 | goto error; |
2548 | } | |
2549 | assert(reg_chan); | |
2550 | ||
2551 | /* | |
2552 | * Create the buffers on the consumer side. This call populates the | |
2553 | * ust app channel object with all streams and data object. | |
2554 | */ | |
2555 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2556 | app->bits_per_long, reg_uid->registry->reg.ust); | |
2557 | if (ret < 0) { | |
f14256d6 MD |
2558 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
2559 | ua_chan->name); | |
2560 | ||
07d2ae95 DG |
2561 | /* |
2562 | * Let's remove the previously created buffer registry channel so | |
2563 | * it's not visible anymore in the session registry. | |
2564 | */ | |
2565 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, | |
2566 | ua_chan->tracing_channel_id); | |
2567 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
2568 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
7972aab2 DG |
2569 | goto error; |
2570 | } | |
2571 | ||
2572 | /* | |
2573 | * Setup the streams and add it to the session registry. | |
2574 | */ | |
2575 | ret = setup_buffer_reg_channel(reg_uid->registry, ua_chan, reg_chan); | |
2576 | if (ret < 0) { | |
f14256d6 MD |
2577 | ERR("Error setting up UST channel \"%s\"", |
2578 | ua_chan->name); | |
7972aab2 DG |
2579 | goto error; |
2580 | } | |
2581 | ||
2582 | } | |
2583 | ||
2584 | /* Send buffers to the application. */ | |
2585 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
9730260e | 2586 | if (ret < 0) { |
f14256d6 MD |
2587 | /* |
2588 | * Don't report error to the console, since it may be | |
2589 | * caused by application concurrently exiting. | |
2590 | */ | |
9730260e DG |
2591 | goto error; |
2592 | } | |
2593 | ||
9730260e DG |
2594 | error: |
2595 | return ret; | |
2596 | } | |
2597 | ||
78f0bacd | 2598 | /* |
7972aab2 DG |
2599 | * Create and send to the application the created buffers with per PID buffers. |
2600 | * | |
2601 | * Return 0 on success else a negative value. | |
78f0bacd | 2602 | */ |
7972aab2 DG |
2603 | static int create_channel_per_pid(struct ust_app *app, |
2604 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2605 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2606 | { |
8535a6d9 | 2607 | int ret; |
7972aab2 | 2608 | struct ust_registry_session *registry; |
78f0bacd | 2609 | |
7972aab2 DG |
2610 | assert(app); |
2611 | assert(usess); | |
2612 | assert(ua_sess); | |
2613 | assert(ua_chan); | |
2614 | ||
2615 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2616 | ||
2617 | rcu_read_lock(); | |
2618 | ||
2619 | registry = get_session_registry(ua_sess); | |
2620 | assert(registry); | |
2621 | ||
2622 | /* Create and add a new channel registry to session. */ | |
2623 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd | 2624 | if (ret < 0) { |
f14256d6 MD |
2625 | ERR("Error creating the UST channel \"%s\" registry instance", |
2626 | ua_chan->name); | |
78f0bacd DG |
2627 | goto error; |
2628 | } | |
2629 | ||
7972aab2 DG |
2630 | /* Create and get channel on the consumer side. */ |
2631 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2632 | app->bits_per_long, registry); | |
2633 | if (ret < 0) { | |
f14256d6 MD |
2634 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
2635 | ua_chan->name); | |
7972aab2 DG |
2636 | goto error; |
2637 | } | |
2638 | ||
2639 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
2640 | if (ret < 0) { | |
f14256d6 MD |
2641 | /* |
2642 | * Don't report error to the console, since it may be | |
2643 | * caused by application concurrently exiting. | |
2644 | */ | |
7972aab2 DG |
2645 | goto error; |
2646 | } | |
8535a6d9 | 2647 | |
78f0bacd | 2648 | error: |
7972aab2 | 2649 | rcu_read_unlock(); |
78f0bacd DG |
2650 | return ret; |
2651 | } | |
2652 | ||
2653 | /* | |
7972aab2 DG |
2654 | * From an already allocated ust app channel, create the channel buffers if |
2655 | * need and send it to the application. This MUST be called with a RCU read | |
2656 | * side lock acquired. | |
2657 | * | |
2658 | * Return 0 on success or else a negative value. | |
78f0bacd | 2659 | */ |
7972aab2 DG |
2660 | static int do_create_channel(struct ust_app *app, |
2661 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2662 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2663 | { |
7972aab2 | 2664 | int ret; |
78f0bacd | 2665 | |
7972aab2 DG |
2666 | assert(app); |
2667 | assert(usess); | |
2668 | assert(ua_sess); | |
2669 | assert(ua_chan); | |
2670 | ||
2671 | /* Handle buffer type before sending the channel to the application. */ | |
2672 | switch (usess->buffer_type) { | |
2673 | case LTTNG_BUFFER_PER_UID: | |
2674 | { | |
2675 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
2676 | if (ret < 0) { | |
2677 | goto error; | |
2678 | } | |
2679 | break; | |
2680 | } | |
2681 | case LTTNG_BUFFER_PER_PID: | |
2682 | { | |
2683 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
2684 | if (ret < 0) { | |
2685 | goto error; | |
2686 | } | |
2687 | break; | |
2688 | } | |
2689 | default: | |
2690 | assert(0); | |
2691 | ret = -EINVAL; | |
78f0bacd DG |
2692 | goto error; |
2693 | } | |
2694 | ||
7972aab2 DG |
2695 | /* Initialize ust objd object using the received handle and add it. */ |
2696 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
2697 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 2698 | |
7972aab2 DG |
2699 | /* If channel is not enabled, disable it on the tracer */ |
2700 | if (!ua_chan->enabled) { | |
2701 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2702 | if (ret < 0) { | |
2703 | goto error; | |
2704 | } | |
78f0bacd DG |
2705 | } |
2706 | ||
2707 | error: | |
2708 | return ret; | |
2709 | } | |
2710 | ||
284d8f55 | 2711 | /* |
4d710ac2 DG |
2712 | * Create UST app channel and create it on the tracer. Set ua_chanp of the |
2713 | * newly created channel if not NULL. | |
d0b96690 | 2714 | * |
36b588ed | 2715 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 DG |
2716 | * |
2717 | * Return 0 on success or else a negative value. | |
284d8f55 | 2718 | */ |
4d710ac2 DG |
2719 | static int create_ust_app_channel(struct ust_app_session *ua_sess, |
2720 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
7972aab2 | 2721 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 2722 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
2723 | { |
2724 | int ret = 0; | |
bec39940 DG |
2725 | struct lttng_ht_iter iter; |
2726 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
2727 | struct ust_app_channel *ua_chan; |
2728 | ||
2729 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
2730 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
2731 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 2732 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 2733 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 2734 | goto end; |
5b4a0ec0 DG |
2735 | } |
2736 | ||
d0b96690 | 2737 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
2738 | if (ua_chan == NULL) { |
2739 | /* Only malloc can fail here */ | |
4d710ac2 | 2740 | ret = -ENOMEM; |
094d1690 | 2741 | goto error_alloc; |
fc34caaa DG |
2742 | } |
2743 | shadow_copy_channel(ua_chan, uchan); | |
2744 | ||
ffe60014 DG |
2745 | /* Set channel type. */ |
2746 | ua_chan->attr.type = type; | |
2747 | ||
7972aab2 | 2748 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
5b4a0ec0 DG |
2749 | if (ret < 0) { |
2750 | goto error; | |
2751 | } | |
2752 | ||
fc34caaa | 2753 | DBG2("UST app create channel %s for PID %d completed", ua_chan->name, |
852d0037 | 2754 | app->pid); |
fc34caaa | 2755 | |
d0b96690 DG |
2756 | /* Only add the channel if successful on the tracer side. */ |
2757 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
2758 | ||
fc34caaa | 2759 | end: |
4d710ac2 DG |
2760 | if (ua_chanp) { |
2761 | *ua_chanp = ua_chan; | |
2762 | } | |
2763 | ||
2764 | /* Everything went well. */ | |
2765 | return 0; | |
5b4a0ec0 DG |
2766 | |
2767 | error: | |
d0b96690 | 2768 | delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app); |
094d1690 | 2769 | error_alloc: |
4d710ac2 | 2770 | return ret; |
5b4a0ec0 DG |
2771 | } |
2772 | ||
2773 | /* | |
2774 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
2775 | * |
2776 | * Called with ust app session mutex held. | |
5b4a0ec0 | 2777 | */ |
edb67388 DG |
2778 | static |
2779 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
2780 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
2781 | struct ust_app *app) | |
284d8f55 | 2782 | { |
edb67388 | 2783 | int ret = 0; |
5b4a0ec0 | 2784 | struct ust_app_event *ua_event; |
284d8f55 | 2785 | |
5b4a0ec0 | 2786 | /* Get event node */ |
18eace3b | 2787 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 2788 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 2789 | if (ua_event != NULL) { |
fc34caaa | 2790 | ret = -EEXIST; |
edb67388 DG |
2791 | goto end; |
2792 | } | |
5b4a0ec0 | 2793 | |
edb67388 DG |
2794 | /* Does not exist so create one */ |
2795 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); | |
2796 | if (ua_event == NULL) { | |
2797 | /* Only malloc can failed so something is really wrong */ | |
2798 | ret = -ENOMEM; | |
fc34caaa | 2799 | goto end; |
5b4a0ec0 | 2800 | } |
edb67388 | 2801 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 2802 | |
edb67388 | 2803 | /* Create it on the tracer side */ |
5b4a0ec0 | 2804 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 2805 | if (ret < 0) { |
fc34caaa | 2806 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 2807 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
2808 | goto error; |
2809 | } | |
2810 | ||
d0b96690 | 2811 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 2812 | |
fc34caaa | 2813 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 2814 | app->pid); |
7f79d3a1 | 2815 | |
edb67388 | 2816 | end: |
fc34caaa DG |
2817 | return ret; |
2818 | ||
5b4a0ec0 | 2819 | error: |
fc34caaa DG |
2820 | /* Valid. Calling here is already in a read side lock */ |
2821 | delete_ust_app_event(-1, ua_event); | |
edb67388 | 2822 | return ret; |
5b4a0ec0 DG |
2823 | } |
2824 | ||
2825 | /* | |
2826 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 2827 | * |
7972aab2 | 2828 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
2829 | */ |
2830 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
ad7a9107 | 2831 | struct ust_app *app, struct consumer_output *consumer) |
5b4a0ec0 DG |
2832 | { |
2833 | int ret = 0; | |
ffe60014 | 2834 | struct ust_app_channel *metadata; |
d88aee68 | 2835 | struct consumer_socket *socket; |
7972aab2 | 2836 | struct ust_registry_session *registry; |
5b4a0ec0 | 2837 | |
ffe60014 DG |
2838 | assert(ua_sess); |
2839 | assert(app); | |
d88aee68 | 2840 | assert(consumer); |
5b4a0ec0 | 2841 | |
7972aab2 DG |
2842 | registry = get_session_registry(ua_sess); |
2843 | assert(registry); | |
2844 | ||
e3ae3c71 MD |
2845 | pthread_mutex_lock(®istry->lock); |
2846 | ||
1b532a60 DG |
2847 | /* Metadata already exists for this registry or it was closed previously */ |
2848 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
2849 | ret = 0; |
2850 | goto error; | |
5b4a0ec0 DG |
2851 | } |
2852 | ||
ffe60014 | 2853 | /* Allocate UST metadata */ |
d0b96690 | 2854 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
2855 | if (!metadata) { |
2856 | /* malloc() failed */ | |
2857 | ret = -ENOMEM; | |
2858 | goto error; | |
2859 | } | |
5b4a0ec0 | 2860 | |
ad7a9107 | 2861 | memcpy(&metadata->attr, &ua_sess->metadata_attr, sizeof(metadata->attr)); |
5b4a0ec0 | 2862 | |
7972aab2 DG |
2863 | /* Need one fd for the channel. */ |
2864 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2865 | if (ret < 0) { | |
2866 | ERR("Exhausted number of available FD upon create metadata"); | |
2867 | goto error; | |
2868 | } | |
2869 | ||
4dc3dfc5 DG |
2870 | /* Get the right consumer socket for the application. */ |
2871 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
2872 | if (!socket) { | |
2873 | ret = -EINVAL; | |
2874 | goto error_consumer; | |
2875 | } | |
2876 | ||
331744e3 JD |
2877 | /* |
2878 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
2879 | * to the registry *before* we ask the consumer so we avoid the race of the | |
2880 | * consumer requesting the metadata and the ask_channel call on our side | |
2881 | * did not returned yet. | |
2882 | */ | |
2883 | registry->metadata_key = metadata->key; | |
2884 | ||
d88aee68 DG |
2885 | /* |
2886 | * Ask the metadata channel creation to the consumer. The metadata object | |
2887 | * will be created by the consumer and kept their. However, the stream is | |
2888 | * never added or monitored until we do a first push metadata to the | |
2889 | * consumer. | |
2890 | */ | |
7972aab2 DG |
2891 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
2892 | registry); | |
d88aee68 | 2893 | if (ret < 0) { |
f2a444f1 DG |
2894 | /* Nullify the metadata key so we don't try to close it later on. */ |
2895 | registry->metadata_key = 0; | |
d88aee68 DG |
2896 | goto error_consumer; |
2897 | } | |
2898 | ||
2899 | /* | |
2900 | * The setup command will make the metadata stream be sent to the relayd, | |
2901 | * if applicable, and the thread managing the metadatas. This is important | |
2902 | * because after this point, if an error occurs, the only way the stream | |
2903 | * can be deleted is to be monitored in the consumer. | |
2904 | */ | |
7972aab2 | 2905 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 2906 | if (ret < 0) { |
f2a444f1 DG |
2907 | /* Nullify the metadata key so we don't try to close it later on. */ |
2908 | registry->metadata_key = 0; | |
d88aee68 | 2909 | goto error_consumer; |
5b4a0ec0 DG |
2910 | } |
2911 | ||
7972aab2 DG |
2912 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
2913 | metadata->key, app->pid); | |
5b4a0ec0 | 2914 | |
d88aee68 | 2915 | error_consumer: |
b80f0b6c | 2916 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 2917 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 2918 | error: |
e3ae3c71 | 2919 | pthread_mutex_unlock(®istry->lock); |
ffe60014 | 2920 | return ret; |
5b4a0ec0 DG |
2921 | } |
2922 | ||
5b4a0ec0 | 2923 | /* |
d88aee68 DG |
2924 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
2925 | * acquired before calling this function. | |
5b4a0ec0 DG |
2926 | */ |
2927 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
2928 | { | |
d88aee68 | 2929 | struct ust_app *app = NULL; |
bec39940 DG |
2930 | struct lttng_ht_node_ulong *node; |
2931 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 2932 | |
bec39940 DG |
2933 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
2934 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
2935 | if (node == NULL) { |
2936 | DBG2("UST app no found with pid %d", pid); | |
2937 | goto error; | |
2938 | } | |
5b4a0ec0 DG |
2939 | |
2940 | DBG2("Found UST app by pid %d", pid); | |
2941 | ||
d88aee68 | 2942 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
2943 | |
2944 | error: | |
d88aee68 | 2945 | return app; |
5b4a0ec0 DG |
2946 | } |
2947 | ||
d88aee68 DG |
2948 | /* |
2949 | * Allocate and init an UST app object using the registration information and | |
2950 | * the command socket. This is called when the command socket connects to the | |
2951 | * session daemon. | |
2952 | * | |
2953 | * The object is returned on success or else NULL. | |
2954 | */ | |
d0b96690 | 2955 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 2956 | { |
d0b96690 DG |
2957 | struct ust_app *lta = NULL; |
2958 | ||
2959 | assert(msg); | |
2960 | assert(sock >= 0); | |
2961 | ||
2962 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 2963 | |
173af62f DG |
2964 | if ((msg->bits_per_long == 64 && |
2965 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
2966 | || (msg->bits_per_long == 32 && | |
2967 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 2968 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
2969 | "%d-bit long, but no consumerd for this size is available.\n", |
2970 | msg->name, msg->pid, msg->bits_per_long); | |
2971 | goto error; | |
3f2c5fcc | 2972 | } |
d0b96690 | 2973 | |
5b4a0ec0 DG |
2974 | lta = zmalloc(sizeof(struct ust_app)); |
2975 | if (lta == NULL) { | |
2976 | PERROR("malloc"); | |
d0b96690 | 2977 | goto error; |
5b4a0ec0 DG |
2978 | } |
2979 | ||
2980 | lta->ppid = msg->ppid; | |
2981 | lta->uid = msg->uid; | |
2982 | lta->gid = msg->gid; | |
d0b96690 | 2983 | |
7753dea8 | 2984 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
2985 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
2986 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
2987 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
2988 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
2989 | lta->long_alignment = msg->long_alignment; | |
2990 | lta->byte_order = msg->byte_order; | |
2991 | ||
5b4a0ec0 DG |
2992 | lta->v_major = msg->major; |
2993 | lta->v_minor = msg->minor; | |
d9bf3ca4 | 2994 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 DG |
2995 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
2996 | lta->notify_sock = -1; | |
d88aee68 DG |
2997 | |
2998 | /* Copy name and make sure it's NULL terminated. */ | |
2999 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
3000 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
3001 | ||
3002 | /* | |
3003 | * Before this can be called, when receiving the registration information, | |
3004 | * the application compatibility is checked. So, at this point, the | |
3005 | * application can work with this session daemon. | |
3006 | */ | |
d0b96690 | 3007 | lta->compatible = 1; |
5b4a0ec0 | 3008 | |
852d0037 | 3009 | lta->pid = msg->pid; |
d0b96690 | 3010 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 3011 | lta->sock = sock; |
d0b96690 | 3012 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 3013 | |
d42f20df DG |
3014 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
3015 | ||
d0b96690 DG |
3016 | error: |
3017 | return lta; | |
3018 | } | |
3019 | ||
d88aee68 DG |
3020 | /* |
3021 | * For a given application object, add it to every hash table. | |
3022 | */ | |
d0b96690 DG |
3023 | void ust_app_add(struct ust_app *app) |
3024 | { | |
3025 | assert(app); | |
3026 | assert(app->notify_sock >= 0); | |
3027 | ||
5b4a0ec0 | 3028 | rcu_read_lock(); |
852d0037 DG |
3029 | |
3030 | /* | |
3031 | * On a re-registration, we want to kick out the previous registration of | |
3032 | * that pid | |
3033 | */ | |
d0b96690 | 3034 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
3035 | |
3036 | /* | |
3037 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
3038 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
3039 | * already in the table. | |
3040 | */ | |
d0b96690 | 3041 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 3042 | |
d0b96690 DG |
3043 | /* Add application to the notify socket hash table. */ |
3044 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
3045 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 3046 | |
d0b96690 | 3047 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
3048 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
3049 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
3050 | app->v_minor); | |
5b4a0ec0 | 3051 | |
d0b96690 DG |
3052 | rcu_read_unlock(); |
3053 | } | |
3054 | ||
d88aee68 DG |
3055 | /* |
3056 | * Set the application version into the object. | |
3057 | * | |
3058 | * Return 0 on success else a negative value either an errno code or a | |
3059 | * LTTng-UST error code. | |
3060 | */ | |
d0b96690 DG |
3061 | int ust_app_version(struct ust_app *app) |
3062 | { | |
d88aee68 DG |
3063 | int ret; |
3064 | ||
d0b96690 | 3065 | assert(app); |
d88aee68 DG |
3066 | |
3067 | ret = ustctl_tracer_version(app->sock, &app->version); | |
3068 | if (ret < 0) { | |
3069 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
5368d366 | 3070 | ERR("UST app %d version failed with ret %d", app->sock, ret); |
d88aee68 | 3071 | } else { |
5368d366 | 3072 | DBG3("UST app %d version failed. Application is dead", app->sock); |
d88aee68 DG |
3073 | } |
3074 | } | |
3075 | ||
3076 | return ret; | |
5b4a0ec0 DG |
3077 | } |
3078 | ||
3079 | /* | |
3080 | * Unregister app by removing it from the global traceable app list and freeing | |
3081 | * the data struct. | |
3082 | * | |
3083 | * The socket is already closed at this point so no close to sock. | |
3084 | */ | |
3085 | void ust_app_unregister(int sock) | |
3086 | { | |
3087 | struct ust_app *lta; | |
bec39940 | 3088 | struct lttng_ht_node_ulong *node; |
99090057 | 3089 | struct lttng_ht_iter ust_app_sock_iter; |
bec39940 | 3090 | struct lttng_ht_iter iter; |
d42f20df | 3091 | struct ust_app_session *ua_sess; |
525b0740 | 3092 | int ret; |
5b4a0ec0 DG |
3093 | |
3094 | rcu_read_lock(); | |
886459c6 | 3095 | |
5b4a0ec0 | 3096 | /* Get the node reference for a call_rcu */ |
99090057 MD |
3097 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &ust_app_sock_iter); |
3098 | node = lttng_ht_iter_get_node_ulong(&ust_app_sock_iter); | |
d0b96690 | 3099 | assert(node); |
284d8f55 | 3100 | |
852d0037 | 3101 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
3102 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
3103 | ||
d88aee68 | 3104 | /* |
e3ae3c71 MD |
3105 | * For per-PID buffers, perform "push metadata" and flush all |
3106 | * application streams before removing app from hash tables, | |
3107 | * ensuring proper behavior of data_pending check. | |
99090057 | 3108 | * Remove sessions so they are not visible during deletion. |
d88aee68 | 3109 | */ |
d42f20df DG |
3110 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, |
3111 | node.node) { | |
7972aab2 DG |
3112 | struct ust_registry_session *registry; |
3113 | ||
d42f20df DG |
3114 | ret = lttng_ht_del(lta->sessions, &iter); |
3115 | if (ret) { | |
3116 | /* The session was already removed so scheduled for teardown. */ | |
3117 | continue; | |
3118 | } | |
3119 | ||
e3ae3c71 MD |
3120 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { |
3121 | (void) ust_app_flush_app_session(lta, ua_sess); | |
3122 | } | |
99090057 | 3123 | |
d42f20df DG |
3124 | /* |
3125 | * Add session to list for teardown. This is safe since at this point we | |
3126 | * are the only one using this list. | |
3127 | */ | |
d88aee68 DG |
3128 | pthread_mutex_lock(&ua_sess->lock); |
3129 | ||
3130 | /* | |
3131 | * Normally, this is done in the delete session process which is | |
3132 | * executed in the call rcu below. However, upon registration we can't | |
3133 | * afford to wait for the grace period before pushing data or else the | |
3134 | * data pending feature can race between the unregistration and stop | |
3135 | * command where the data pending command is sent *before* the grace | |
3136 | * period ended. | |
3137 | * | |
3138 | * The close metadata below nullifies the metadata pointer in the | |
3139 | * session so the delete session will NOT push/close a second time. | |
3140 | */ | |
7972aab2 | 3141 | registry = get_session_registry(ua_sess); |
e3ae3c71 | 3142 | if (registry) { |
7972aab2 DG |
3143 | /* Push metadata for application before freeing the application. */ |
3144 | (void) push_metadata(registry, ua_sess->consumer); | |
3145 | ||
3146 | /* | |
3147 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
3148 | * metadata only on destroy trace session in this case. Also, the |
3149 | * previous push metadata could have flag the metadata registry to | |
3150 | * close so don't send a close command if closed. | |
7972aab2 | 3151 | */ |
e3ae3c71 | 3152 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
3153 | /* And ask to close it for this session registry. */ |
3154 | (void) close_metadata(registry, ua_sess->consumer); | |
3155 | } | |
3156 | } | |
d42f20df | 3157 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
99090057 | 3158 | |
d88aee68 | 3159 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
3160 | } |
3161 | ||
99090057 MD |
3162 | /* Remove application from PID hash table */ |
3163 | ret = lttng_ht_del(ust_app_ht_by_sock, &ust_app_sock_iter); | |
3164 | assert(!ret); | |
3165 | ||
3166 | /* | |
3167 | * Remove application from notify hash table. The thread handling the | |
3168 | * notify socket could have deleted the node so ignore on error because | |
3169 | * either way it's valid. The close of that socket is handled by the other | |
3170 | * thread. | |
3171 | */ | |
3172 | iter.iter.node = <a->notify_sock_n.node; | |
3173 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3174 | ||
3175 | /* | |
3176 | * Ignore return value since the node might have been removed before by an | |
3177 | * add replace during app registration because the PID can be reassigned by | |
3178 | * the OS. | |
3179 | */ | |
3180 | iter.iter.node = <a->pid_n.node; | |
3181 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3182 | if (ret) { | |
3183 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
3184 | lta->pid); | |
3185 | } | |
3186 | ||
852d0037 DG |
3187 | /* Free memory */ |
3188 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
3189 | ||
5b4a0ec0 DG |
3190 | rcu_read_unlock(); |
3191 | return; | |
284d8f55 DG |
3192 | } |
3193 | ||
5b4a0ec0 DG |
3194 | /* |
3195 | * Fill events array with all events name of all registered apps. | |
3196 | */ | |
3197 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 3198 | { |
5b4a0ec0 DG |
3199 | int ret, handle; |
3200 | size_t nbmem, count = 0; | |
bec39940 | 3201 | struct lttng_ht_iter iter; |
5b4a0ec0 | 3202 | struct ust_app *app; |
c617c0c6 | 3203 | struct lttng_event *tmp_event; |
421cb601 | 3204 | |
5b4a0ec0 | 3205 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
3206 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
3207 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
3208 | PERROR("zmalloc ust app events"); |
3209 | ret = -ENOMEM; | |
421cb601 DG |
3210 | goto error; |
3211 | } | |
3212 | ||
5b4a0ec0 | 3213 | rcu_read_lock(); |
421cb601 | 3214 | |
852d0037 | 3215 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 3216 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 3217 | |
840cb59c | 3218 | health_code_update(); |
86acf0da | 3219 | |
e0c7ec2b DG |
3220 | if (!app->compatible) { |
3221 | /* | |
3222 | * TODO: In time, we should notice the caller of this error by | |
3223 | * telling him that this is a version error. | |
3224 | */ | |
3225 | continue; | |
3226 | } | |
852d0037 | 3227 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 3228 | if (handle < 0) { |
ffe60014 DG |
3229 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3230 | ERR("UST app list events getting handle failed for app pid %d", | |
3231 | app->pid); | |
3232 | } | |
5b4a0ec0 DG |
3233 | continue; |
3234 | } | |
421cb601 | 3235 | |
852d0037 | 3236 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 3237 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3238 | /* Handle ustctl error. */ |
3239 | if (ret < 0) { | |
a2ba1ab0 | 3240 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3241 | ERR("UST app tp list get failed for app %d with ret %d", |
3242 | app->sock, ret); | |
3243 | } else { | |
3244 | DBG3("UST app tp list get failed. Application is dead"); | |
3757b385 DG |
3245 | /* |
3246 | * This is normal behavior, an application can die during the | |
3247 | * creation process. Don't report an error so the execution can | |
3248 | * continue normally. Continue normal execution. | |
3249 | */ | |
3250 | break; | |
ffe60014 | 3251 | } |
98f595d4 | 3252 | free(tmp_event); |
ffe60014 DG |
3253 | goto rcu_error; |
3254 | } | |
3255 | ||
840cb59c | 3256 | health_code_update(); |
815564d8 | 3257 | if (count >= nbmem) { |
d7b3776f | 3258 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3259 | struct lttng_event *new_tmp_event; |
3260 | size_t new_nbmem; | |
3261 | ||
3262 | new_nbmem = nbmem << 1; | |
3263 | DBG2("Reallocating event list from %zu to %zu entries", | |
3264 | nbmem, new_nbmem); | |
3265 | new_tmp_event = realloc(tmp_event, | |
3266 | new_nbmem * sizeof(struct lttng_event)); | |
3267 | if (new_tmp_event == NULL) { | |
5b4a0ec0 | 3268 | PERROR("realloc ust app events"); |
c617c0c6 | 3269 | free(tmp_event); |
5b4a0ec0 DG |
3270 | ret = -ENOMEM; |
3271 | goto rcu_error; | |
3272 | } | |
53efb85a MD |
3273 | /* Zero the new memory */ |
3274 | memset(new_tmp_event + nbmem, 0, | |
3275 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
3276 | nbmem = new_nbmem; | |
3277 | tmp_event = new_tmp_event; | |
5b4a0ec0 | 3278 | } |
c617c0c6 MD |
3279 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
3280 | tmp_event[count].loglevel = uiter.loglevel; | |
3281 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
3282 | tmp_event[count].pid = app->pid; | |
3283 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 3284 | count++; |
421cb601 | 3285 | } |
421cb601 DG |
3286 | } |
3287 | ||
5b4a0ec0 | 3288 | ret = count; |
c617c0c6 | 3289 | *events = tmp_event; |
421cb601 | 3290 | |
5b4a0ec0 | 3291 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 3292 | |
5b4a0ec0 DG |
3293 | rcu_error: |
3294 | rcu_read_unlock(); | |
421cb601 | 3295 | error: |
840cb59c | 3296 | health_code_update(); |
5b4a0ec0 | 3297 | return ret; |
421cb601 DG |
3298 | } |
3299 | ||
f37d259d MD |
3300 | /* |
3301 | * Fill events array with all events name of all registered apps. | |
3302 | */ | |
3303 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
3304 | { | |
3305 | int ret, handle; | |
3306 | size_t nbmem, count = 0; | |
3307 | struct lttng_ht_iter iter; | |
3308 | struct ust_app *app; | |
c617c0c6 | 3309 | struct lttng_event_field *tmp_event; |
f37d259d MD |
3310 | |
3311 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
3312 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
3313 | if (tmp_event == NULL) { | |
f37d259d MD |
3314 | PERROR("zmalloc ust app event fields"); |
3315 | ret = -ENOMEM; | |
3316 | goto error; | |
3317 | } | |
3318 | ||
3319 | rcu_read_lock(); | |
3320 | ||
3321 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3322 | struct lttng_ust_field_iter uiter; | |
3323 | ||
840cb59c | 3324 | health_code_update(); |
86acf0da | 3325 | |
f37d259d MD |
3326 | if (!app->compatible) { |
3327 | /* | |
3328 | * TODO: In time, we should notice the caller of this error by | |
3329 | * telling him that this is a version error. | |
3330 | */ | |
3331 | continue; | |
3332 | } | |
3333 | handle = ustctl_tracepoint_field_list(app->sock); | |
3334 | if (handle < 0) { | |
ffe60014 DG |
3335 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3336 | ERR("UST app list field getting handle failed for app pid %d", | |
3337 | app->pid); | |
3338 | } | |
f37d259d MD |
3339 | continue; |
3340 | } | |
3341 | ||
3342 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 3343 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3344 | /* Handle ustctl error. */ |
3345 | if (ret < 0) { | |
a2ba1ab0 | 3346 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3347 | ERR("UST app tp list field failed for app %d with ret %d", |
3348 | app->sock, ret); | |
3349 | } else { | |
3350 | DBG3("UST app tp list field failed. Application is dead"); | |
3757b385 DG |
3351 | /* |
3352 | * This is normal behavior, an application can die during the | |
3353 | * creation process. Don't report an error so the execution can | |
98f595d4 | 3354 | * continue normally. Reset list and count for next app. |
3757b385 DG |
3355 | */ |
3356 | break; | |
ffe60014 | 3357 | } |
98f595d4 | 3358 | free(tmp_event); |
ffe60014 DG |
3359 | goto rcu_error; |
3360 | } | |
3361 | ||
840cb59c | 3362 | health_code_update(); |
f37d259d | 3363 | if (count >= nbmem) { |
d7b3776f | 3364 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3365 | struct lttng_event_field *new_tmp_event; |
3366 | size_t new_nbmem; | |
3367 | ||
3368 | new_nbmem = nbmem << 1; | |
3369 | DBG2("Reallocating event field list from %zu to %zu entries", | |
3370 | nbmem, new_nbmem); | |
3371 | new_tmp_event = realloc(tmp_event, | |
3372 | new_nbmem * sizeof(struct lttng_event_field)); | |
3373 | if (new_tmp_event == NULL) { | |
f37d259d | 3374 | PERROR("realloc ust app event fields"); |
c617c0c6 | 3375 | free(tmp_event); |
f37d259d MD |
3376 | ret = -ENOMEM; |
3377 | goto rcu_error; | |
3378 | } | |
53efb85a MD |
3379 | /* Zero the new memory */ |
3380 | memset(new_tmp_event + nbmem, 0, | |
3381 | (new_nbmem - nbmem) * sizeof(struct lttng_event_field)); | |
3382 | nbmem = new_nbmem; | |
3383 | tmp_event = new_tmp_event; | |
f37d259d | 3384 | } |
f37d259d | 3385 | |
c617c0c6 | 3386 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
2e84128e DG |
3387 | /* Mapping between these enums matches 1 to 1. */ |
3388 | tmp_event[count].type = (enum lttng_event_field_type) uiter.type; | |
c617c0c6 | 3389 | tmp_event[count].nowrite = uiter.nowrite; |
f37d259d | 3390 | |
c617c0c6 MD |
3391 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
3392 | tmp_event[count].event.loglevel = uiter.loglevel; | |
2e84128e | 3393 | tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; |
c617c0c6 MD |
3394 | tmp_event[count].event.pid = app->pid; |
3395 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
3396 | count++; |
3397 | } | |
3398 | } | |
3399 | ||
3400 | ret = count; | |
c617c0c6 | 3401 | *fields = tmp_event; |
f37d259d MD |
3402 | |
3403 | DBG2("UST app list event fields done (%zu events)", count); | |
3404 | ||
3405 | rcu_error: | |
3406 | rcu_read_unlock(); | |
3407 | error: | |
840cb59c | 3408 | health_code_update(); |
f37d259d MD |
3409 | return ret; |
3410 | } | |
3411 | ||
5b4a0ec0 DG |
3412 | /* |
3413 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
3414 | * |
3415 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
3416 | */ |
3417 | void ust_app_clean_list(void) | |
421cb601 | 3418 | { |
5b4a0ec0 | 3419 | int ret; |
659ed79f | 3420 | struct ust_app *app; |
bec39940 | 3421 | struct lttng_ht_iter iter; |
421cb601 | 3422 | |
5b4a0ec0 | 3423 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3424 | |
5b4a0ec0 | 3425 | rcu_read_lock(); |
421cb601 | 3426 | |
659ed79f | 3427 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3428 | ret = lttng_ht_del(ust_app_ht, &iter); |
525b0740 | 3429 | assert(!ret); |
659ed79f | 3430 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); |
421cb601 DG |
3431 | } |
3432 | ||
852d0037 | 3433 | /* Cleanup socket hash table */ |
659ed79f DG |
3434 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, |
3435 | sock_n.node) { | |
852d0037 | 3436 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
bec39940 DG |
3437 | assert(!ret); |
3438 | } | |
852d0037 | 3439 | |
d88aee68 DG |
3440 | /* Cleanup notify socket hash table */ |
3441 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3442 | notify_sock_n.node) { | |
3443 | ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3444 | assert(!ret); | |
3445 | } | |
36b588ed | 3446 | rcu_read_unlock(); |
d88aee68 | 3447 | |
bec39940 | 3448 | /* Destroy is done only when the ht is empty */ |
0b2dc8df MD |
3449 | ht_cleanup_push(ust_app_ht); |
3450 | ht_cleanup_push(ust_app_ht_by_sock); | |
3451 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
5b4a0ec0 DG |
3452 | } |
3453 | ||
3454 | /* | |
3455 | * Init UST app hash table. | |
3456 | */ | |
3457 | void ust_app_ht_alloc(void) | |
3458 | { | |
bec39940 | 3459 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
852d0037 | 3460 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3461 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
421cb601 DG |
3462 | } |
3463 | ||
78f0bacd DG |
3464 | /* |
3465 | * For a specific UST session, disable the channel for all registered apps. | |
3466 | */ | |
35a9059d | 3467 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3468 | struct ltt_ust_channel *uchan) |
3469 | { | |
3470 | int ret = 0; | |
bec39940 DG |
3471 | struct lttng_ht_iter iter; |
3472 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3473 | struct ust_app *app; |
3474 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3475 | struct ust_app_channel *ua_chan; |
78f0bacd DG |
3476 | |
3477 | if (usess == NULL || uchan == NULL) { | |
3478 | ERR("Disabling UST global channel with NULL values"); | |
3479 | ret = -1; | |
3480 | goto error; | |
3481 | } | |
3482 | ||
d9bf3ca4 | 3483 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 3484 | uchan->name, usess->id); |
78f0bacd DG |
3485 | |
3486 | rcu_read_lock(); | |
3487 | ||
3488 | /* For every registered applications */ | |
852d0037 | 3489 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3490 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3491 | if (!app->compatible) { |
3492 | /* | |
3493 | * TODO: In time, we should notice the caller of this error by | |
3494 | * telling him that this is a version error. | |
3495 | */ | |
3496 | continue; | |
3497 | } | |
78f0bacd DG |
3498 | ua_sess = lookup_session_by_app(usess, app); |
3499 | if (ua_sess == NULL) { | |
3500 | continue; | |
3501 | } | |
3502 | ||
8535a6d9 | 3503 | /* Get channel */ |
bec39940 DG |
3504 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3505 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
3506 | /* If the session if found for the app, the channel must be there */ |
3507 | assert(ua_chan_node); | |
3508 | ||
3509 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3510 | /* The channel must not be already disabled */ | |
3511 | assert(ua_chan->enabled == 1); | |
3512 | ||
3513 | /* Disable channel onto application */ | |
3514 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
3515 | if (ret < 0) { |
3516 | /* XXX: We might want to report this error at some point... */ | |
3517 | continue; | |
3518 | } | |
3519 | } | |
3520 | ||
3521 | rcu_read_unlock(); | |
3522 | ||
3523 | error: | |
3524 | return ret; | |
3525 | } | |
3526 | ||
3527 | /* | |
3528 | * For a specific UST session, enable the channel for all registered apps. | |
3529 | */ | |
35a9059d | 3530 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3531 | struct ltt_ust_channel *uchan) |
3532 | { | |
3533 | int ret = 0; | |
bec39940 | 3534 | struct lttng_ht_iter iter; |
78f0bacd DG |
3535 | struct ust_app *app; |
3536 | struct ust_app_session *ua_sess; | |
3537 | ||
3538 | if (usess == NULL || uchan == NULL) { | |
3539 | ERR("Adding UST global channel to NULL values"); | |
3540 | ret = -1; | |
3541 | goto error; | |
3542 | } | |
3543 | ||
d9bf3ca4 | 3544 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 3545 | uchan->name, usess->id); |
78f0bacd DG |
3546 | |
3547 | rcu_read_lock(); | |
3548 | ||
3549 | /* For every registered applications */ | |
852d0037 | 3550 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3551 | if (!app->compatible) { |
3552 | /* | |
3553 | * TODO: In time, we should notice the caller of this error by | |
3554 | * telling him that this is a version error. | |
3555 | */ | |
3556 | continue; | |
3557 | } | |
78f0bacd DG |
3558 | ua_sess = lookup_session_by_app(usess, app); |
3559 | if (ua_sess == NULL) { | |
3560 | continue; | |
3561 | } | |
3562 | ||
3563 | /* Enable channel onto application */ | |
3564 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
3565 | if (ret < 0) { | |
3566 | /* XXX: We might want to report this error at some point... */ | |
3567 | continue; | |
3568 | } | |
3569 | } | |
3570 | ||
3571 | rcu_read_unlock(); | |
3572 | ||
3573 | error: | |
3574 | return ret; | |
3575 | } | |
3576 | ||
b0a40d28 DG |
3577 | /* |
3578 | * Disable an event in a channel and for a specific session. | |
3579 | */ | |
35a9059d DG |
3580 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
3581 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
3582 | { |
3583 | int ret = 0; | |
bec39940 DG |
3584 | struct lttng_ht_iter iter, uiter; |
3585 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
b0a40d28 DG |
3586 | struct ust_app *app; |
3587 | struct ust_app_session *ua_sess; | |
3588 | struct ust_app_channel *ua_chan; | |
3589 | struct ust_app_event *ua_event; | |
3590 | ||
3591 | DBG("UST app disabling event %s for all apps in channel " | |
d9bf3ca4 MD |
3592 | "%s for session id %" PRIu64, |
3593 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
3594 | |
3595 | rcu_read_lock(); | |
3596 | ||
3597 | /* For all registered applications */ | |
852d0037 | 3598 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3599 | if (!app->compatible) { |
3600 | /* | |
3601 | * TODO: In time, we should notice the caller of this error by | |
3602 | * telling him that this is a version error. | |
3603 | */ | |
3604 | continue; | |
3605 | } | |
b0a40d28 DG |
3606 | ua_sess = lookup_session_by_app(usess, app); |
3607 | if (ua_sess == NULL) { | |
3608 | /* Next app */ | |
3609 | continue; | |
3610 | } | |
3611 | ||
3612 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3613 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3614 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 3615 | if (ua_chan_node == NULL) { |
d9bf3ca4 | 3616 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 3617 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
3618 | continue; |
3619 | } | |
3620 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3621 | ||
bec39940 DG |
3622 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter); |
3623 | ua_event_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 DG |
3624 | if (ua_event_node == NULL) { |
3625 | DBG2("Event %s not found in channel %s for app pid %d." | |
852d0037 | 3626 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
3627 | continue; |
3628 | } | |
3629 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
3630 | ||
7f79d3a1 | 3631 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
3632 | if (ret < 0) { |
3633 | /* XXX: Report error someday... */ | |
3634 | continue; | |
3635 | } | |
3636 | } | |
3637 | ||
3638 | rcu_read_unlock(); | |
3639 | ||
3640 | return ret; | |
3641 | } | |
3642 | ||
421cb601 | 3643 | /* |
5b4a0ec0 | 3644 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 3645 | */ |
35a9059d | 3646 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3647 | struct ltt_ust_channel *uchan) |
3648 | { | |
3d8ca23b | 3649 | int ret = 0, created; |
bec39940 | 3650 | struct lttng_ht_iter iter; |
48842b30 | 3651 | struct ust_app *app; |
3d8ca23b | 3652 | struct ust_app_session *ua_sess = NULL; |
48842b30 | 3653 | |
fc34caaa DG |
3654 | /* Very wrong code flow */ |
3655 | assert(usess); | |
3656 | assert(uchan); | |
421cb601 | 3657 | |
d9bf3ca4 | 3658 | DBG2("UST app adding channel %s to UST domain for session id %" PRIu64, |
a991f516 | 3659 | uchan->name, usess->id); |
48842b30 DG |
3660 | |
3661 | rcu_read_lock(); | |
421cb601 | 3662 | |
5b4a0ec0 | 3663 | /* For every registered applications */ |
852d0037 | 3664 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3665 | if (!app->compatible) { |
3666 | /* | |
3667 | * TODO: In time, we should notice the caller of this error by | |
3668 | * telling him that this is a version error. | |
3669 | */ | |
3670 | continue; | |
3671 | } | |
edb67388 DG |
3672 | /* |
3673 | * Create session on the tracer side and add it to app session HT. Note | |
3674 | * that if session exist, it will simply return a pointer to the ust | |
3675 | * app session. | |
3676 | */ | |
3d8ca23b DG |
3677 | ret = create_ust_app_session(usess, app, &ua_sess, &created); |
3678 | if (ret < 0) { | |
3679 | switch (ret) { | |
3680 | case -ENOTCONN: | |
3681 | /* | |
3682 | * The application's socket is not valid. Either a bad socket | |
3683 | * or a timeout on it. We can't inform the caller that for a | |
3684 | * specific app, the session failed so lets continue here. | |
3685 | */ | |
3686 | continue; | |
3687 | case -ENOMEM: | |
3688 | default: | |
3689 | goto error_rcu_unlock; | |
3690 | } | |
48842b30 | 3691 | } |
3d8ca23b | 3692 | assert(ua_sess); |
48842b30 | 3693 | |
d0b96690 | 3694 | pthread_mutex_lock(&ua_sess->lock); |
d65d2de8 DG |
3695 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, |
3696 | sizeof(uchan->name))) { | |
ad7a9107 DG |
3697 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, &uchan->attr); |
3698 | ret = 0; | |
d65d2de8 DG |
3699 | } else { |
3700 | /* Create channel onto application. We don't need the chan ref. */ | |
3701 | ret = create_ust_app_channel(ua_sess, uchan, app, | |
3702 | LTTNG_UST_CHAN_PER_CPU, usess, NULL); | |
3703 | } | |
d0b96690 | 3704 | pthread_mutex_unlock(&ua_sess->lock); |
3d8ca23b DG |
3705 | if (ret < 0) { |
3706 | if (ret == -ENOMEM) { | |
3707 | /* No more memory is a fatal error. Stop right now. */ | |
3708 | goto error_rcu_unlock; | |
3709 | } | |
3710 | /* Cleanup the created session if it's the case. */ | |
3711 | if (created) { | |
d0b96690 | 3712 | destroy_app_session(app, ua_sess); |
3d8ca23b | 3713 | } |
48842b30 | 3714 | } |
48842b30 | 3715 | } |
5b4a0ec0 | 3716 | |
95e047ff | 3717 | error_rcu_unlock: |
48842b30 | 3718 | rcu_read_unlock(); |
3c14c33f | 3719 | return ret; |
48842b30 DG |
3720 | } |
3721 | ||
5b4a0ec0 | 3722 | /* |
edb67388 | 3723 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 3724 | */ |
35a9059d | 3725 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3726 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3727 | { | |
3728 | int ret = 0; | |
bec39940 | 3729 | struct lttng_ht_iter iter, uiter; |
18eace3b | 3730 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
3731 | struct ust_app *app; |
3732 | struct ust_app_session *ua_sess; | |
3733 | struct ust_app_channel *ua_chan; | |
3734 | struct ust_app_event *ua_event; | |
48842b30 | 3735 | |
d9bf3ca4 | 3736 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 3737 | uevent->attr.name, usess->id); |
48842b30 | 3738 | |
edb67388 DG |
3739 | /* |
3740 | * NOTE: At this point, this function is called only if the session and | |
3741 | * channel passed are already created for all apps. and enabled on the | |
3742 | * tracer also. | |
3743 | */ | |
3744 | ||
48842b30 | 3745 | rcu_read_lock(); |
421cb601 DG |
3746 | |
3747 | /* For all registered applications */ | |
852d0037 | 3748 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3749 | if (!app->compatible) { |
3750 | /* | |
3751 | * TODO: In time, we should notice the caller of this error by | |
3752 | * telling him that this is a version error. | |
3753 | */ | |
3754 | continue; | |
3755 | } | |
edb67388 | 3756 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3757 | if (!ua_sess) { |
3758 | /* The application has problem or is probably dead. */ | |
3759 | continue; | |
3760 | } | |
ba767faf | 3761 | |
d0b96690 DG |
3762 | pthread_mutex_lock(&ua_sess->lock); |
3763 | ||
edb67388 | 3764 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3765 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3766 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3767 | /* If the channel is not found, there is a code flow error */ |
3768 | assert(ua_chan_node); | |
3769 | ||
3770 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3771 | ||
18eace3b DG |
3772 | /* Get event node */ |
3773 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
39c5a3a7 | 3774 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 3775 | if (ua_event == NULL) { |
7f79d3a1 | 3776 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 3777 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 3778 | goto next_app; |
35a9059d | 3779 | } |
35a9059d DG |
3780 | |
3781 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
3782 | if (ret < 0) { | |
d0b96690 | 3783 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 3784 | goto error; |
48842b30 | 3785 | } |
d0b96690 DG |
3786 | next_app: |
3787 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
3788 | } |
3789 | ||
7f79d3a1 | 3790 | error: |
edb67388 | 3791 | rcu_read_unlock(); |
edb67388 DG |
3792 | return ret; |
3793 | } | |
3794 | ||
3795 | /* | |
3796 | * For a specific existing UST session and UST channel, creates the event for | |
3797 | * all registered apps. | |
3798 | */ | |
35a9059d | 3799 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
3800 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3801 | { | |
3802 | int ret = 0; | |
bec39940 DG |
3803 | struct lttng_ht_iter iter, uiter; |
3804 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
3805 | struct ust_app *app; |
3806 | struct ust_app_session *ua_sess; | |
3807 | struct ust_app_channel *ua_chan; | |
3808 | ||
d9bf3ca4 | 3809 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 3810 | uevent->attr.name, usess->id); |
edb67388 | 3811 | |
edb67388 DG |
3812 | rcu_read_lock(); |
3813 | ||
3814 | /* For all registered applications */ | |
852d0037 | 3815 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3816 | if (!app->compatible) { |
3817 | /* | |
3818 | * TODO: In time, we should notice the caller of this error by | |
3819 | * telling him that this is a version error. | |
3820 | */ | |
3821 | continue; | |
3822 | } | |
edb67388 | 3823 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3824 | if (!ua_sess) { |
3825 | /* The application has problem or is probably dead. */ | |
3826 | continue; | |
3827 | } | |
48842b30 | 3828 | |
d0b96690 | 3829 | pthread_mutex_lock(&ua_sess->lock); |
48842b30 | 3830 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3831 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3832 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3833 | /* If the channel is not found, there is a code flow error */ |
3834 | assert(ua_chan_node); | |
3835 | ||
48842b30 DG |
3836 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3837 | ||
edb67388 | 3838 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 3839 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 3840 | if (ret < 0) { |
49c336c1 | 3841 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
3842 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
3843 | break; | |
3844 | } | |
3845 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 3846 | uevent->attr.name, app->pid); |
5b4a0ec0 | 3847 | continue; |
48842b30 | 3848 | } |
48842b30 | 3849 | } |
5b4a0ec0 | 3850 | |
48842b30 DG |
3851 | rcu_read_unlock(); |
3852 | ||
3853 | return ret; | |
3854 | } | |
3855 | ||
5b4a0ec0 DG |
3856 | /* |
3857 | * Start tracing for a specific UST session and app. | |
3858 | */ | |
b34cbebf | 3859 | static |
421cb601 | 3860 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
3861 | { |
3862 | int ret = 0; | |
48842b30 | 3863 | struct ust_app_session *ua_sess; |
48842b30 | 3864 | |
852d0037 | 3865 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 3866 | |
509cbaf8 MD |
3867 | rcu_read_lock(); |
3868 | ||
e0c7ec2b DG |
3869 | if (!app->compatible) { |
3870 | goto end; | |
3871 | } | |
3872 | ||
421cb601 DG |
3873 | ua_sess = lookup_session_by_app(usess, app); |
3874 | if (ua_sess == NULL) { | |
d42f20df DG |
3875 | /* The session is in teardown process. Ignore and continue. */ |
3876 | goto end; | |
421cb601 | 3877 | } |
48842b30 | 3878 | |
d0b96690 DG |
3879 | pthread_mutex_lock(&ua_sess->lock); |
3880 | ||
aea829b3 DG |
3881 | /* Upon restart, we skip the setup, already done */ |
3882 | if (ua_sess->started) { | |
8be98f9a | 3883 | goto skip_setup; |
aea829b3 | 3884 | } |
8be98f9a | 3885 | |
a4b92340 DG |
3886 | /* Create directories if consumer is LOCAL and has a path defined. */ |
3887 | if (usess->consumer->type == CONSUMER_DST_LOCAL && | |
3888 | strlen(usess->consumer->dst.trace_path) > 0) { | |
3889 | ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path, | |
7972aab2 | 3890 | S_IRWXU | S_IRWXG, ua_sess->euid, ua_sess->egid); |
a4b92340 DG |
3891 | if (ret < 0) { |
3892 | if (ret != -EEXIST) { | |
3893 | ERR("Trace directory creation error"); | |
d0b96690 | 3894 | goto error_unlock; |
421cb601 | 3895 | } |
173af62f | 3896 | } |
7753dea8 | 3897 | } |
aea829b3 | 3898 | |
d65d2de8 DG |
3899 | /* |
3900 | * Create the metadata for the application. This returns gracefully if a | |
3901 | * metadata was already set for the session. | |
3902 | */ | |
ad7a9107 | 3903 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer); |
421cb601 | 3904 | if (ret < 0) { |
d0b96690 | 3905 | goto error_unlock; |
421cb601 | 3906 | } |
48842b30 | 3907 | |
840cb59c | 3908 | health_code_update(); |
86acf0da | 3909 | |
8be98f9a | 3910 | skip_setup: |
421cb601 | 3911 | /* This start the UST tracing */ |
852d0037 | 3912 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
421cb601 | 3913 | if (ret < 0) { |
ffe60014 DG |
3914 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3915 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
3916 | app->pid, ret); | |
3917 | } else { | |
3918 | DBG("UST app start session failed. Application is dead."); | |
3757b385 DG |
3919 | /* |
3920 | * This is normal behavior, an application can die during the | |
3921 | * creation process. Don't report an error so the execution can | |
3922 | * continue normally. | |
3923 | */ | |
3924 | pthread_mutex_unlock(&ua_sess->lock); | |
3925 | goto end; | |
ffe60014 | 3926 | } |
d0b96690 | 3927 | goto error_unlock; |
421cb601 | 3928 | } |
5b4a0ec0 | 3929 | |
55c3953d DG |
3930 | /* Indicate that the session has been started once */ |
3931 | ua_sess->started = 1; | |
3932 | ||
d0b96690 DG |
3933 | pthread_mutex_unlock(&ua_sess->lock); |
3934 | ||
840cb59c | 3935 | health_code_update(); |
86acf0da | 3936 | |
421cb601 | 3937 | /* Quiescent wait after starting trace */ |
ffe60014 DG |
3938 | ret = ustctl_wait_quiescent(app->sock); |
3939 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3940 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3941 | app->pid, ret); | |
3942 | } | |
48842b30 | 3943 | |
e0c7ec2b DG |
3944 | end: |
3945 | rcu_read_unlock(); | |
840cb59c | 3946 | health_code_update(); |
421cb601 | 3947 | return 0; |
48842b30 | 3948 | |
d0b96690 DG |
3949 | error_unlock: |
3950 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 3951 | rcu_read_unlock(); |
840cb59c | 3952 | health_code_update(); |
421cb601 DG |
3953 | return -1; |
3954 | } | |
48842b30 | 3955 | |
8be98f9a MD |
3956 | /* |
3957 | * Stop tracing for a specific UST session and app. | |
3958 | */ | |
b34cbebf | 3959 | static |
8be98f9a MD |
3960 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
3961 | { | |
3962 | int ret = 0; | |
3963 | struct ust_app_session *ua_sess; | |
7972aab2 | 3964 | struct ust_registry_session *registry; |
8be98f9a | 3965 | |
852d0037 | 3966 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
3967 | |
3968 | rcu_read_lock(); | |
3969 | ||
e0c7ec2b | 3970 | if (!app->compatible) { |
d88aee68 | 3971 | goto end_no_session; |
e0c7ec2b DG |
3972 | } |
3973 | ||
8be98f9a MD |
3974 | ua_sess = lookup_session_by_app(usess, app); |
3975 | if (ua_sess == NULL) { | |
d88aee68 | 3976 | goto end_no_session; |
8be98f9a MD |
3977 | } |
3978 | ||
d88aee68 DG |
3979 | pthread_mutex_lock(&ua_sess->lock); |
3980 | ||
9bc07046 DG |
3981 | /* |
3982 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
3983 | * that was never started. It's possible since we can have a fail start |
3984 | * from either the application manager thread or the command thread. Simply | |
3985 | * indicate that this is a stop error. | |
9bc07046 | 3986 | */ |
f9dfc3d9 | 3987 | if (!ua_sess->started) { |
c45536e1 DG |
3988 | goto error_rcu_unlock; |
3989 | } | |
7db205b5 | 3990 | |
840cb59c | 3991 | health_code_update(); |
86acf0da | 3992 | |
9d6c7d3f | 3993 | /* This inhibits UST tracing */ |
852d0037 | 3994 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
9d6c7d3f | 3995 | if (ret < 0) { |
ffe60014 DG |
3996 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3997 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
3998 | app->pid, ret); | |
3999 | } else { | |
4000 | DBG("UST app stop session failed. Application is dead."); | |
3757b385 DG |
4001 | /* |
4002 | * This is normal behavior, an application can die during the | |
4003 | * creation process. Don't report an error so the execution can | |
4004 | * continue normally. | |
4005 | */ | |
4006 | goto end_unlock; | |
ffe60014 | 4007 | } |
9d6c7d3f DG |
4008 | goto error_rcu_unlock; |
4009 | } | |
4010 | ||
840cb59c | 4011 | health_code_update(); |
86acf0da | 4012 | |
9d6c7d3f | 4013 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
4014 | ret = ustctl_wait_quiescent(app->sock); |
4015 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4016 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4017 | app->pid, ret); | |
4018 | } | |
9d6c7d3f | 4019 | |
840cb59c | 4020 | health_code_update(); |
86acf0da | 4021 | |
b34cbebf MD |
4022 | registry = get_session_registry(ua_sess); |
4023 | assert(registry); | |
1b532a60 | 4024 | |
e3ae3c71 MD |
4025 | /* Push metadata for application before freeing the application. */ |
4026 | (void) push_metadata(registry, ua_sess->consumer); | |
b34cbebf | 4027 | |
3757b385 | 4028 | end_unlock: |
b34cbebf MD |
4029 | pthread_mutex_unlock(&ua_sess->lock); |
4030 | end_no_session: | |
4031 | rcu_read_unlock(); | |
4032 | health_code_update(); | |
4033 | return 0; | |
4034 | ||
4035 | error_rcu_unlock: | |
4036 | pthread_mutex_unlock(&ua_sess->lock); | |
4037 | rcu_read_unlock(); | |
4038 | health_code_update(); | |
4039 | return -1; | |
4040 | } | |
4041 | ||
b34cbebf | 4042 | static |
99090057 MD |
4043 | int ust_app_flush_app_session(struct ust_app *app, |
4044 | struct ust_app_session *ua_sess) | |
b34cbebf | 4045 | { |
99090057 | 4046 | int ret, retval = 0; |
b34cbebf | 4047 | struct lttng_ht_iter iter; |
b34cbebf | 4048 | struct ust_app_channel *ua_chan; |
99090057 | 4049 | struct consumer_socket *socket; |
b34cbebf | 4050 | |
99090057 | 4051 | DBG("Flushing app session buffers for ust app pid %d", app->pid); |
b34cbebf MD |
4052 | |
4053 | rcu_read_lock(); | |
4054 | ||
4055 | if (!app->compatible) { | |
99090057 | 4056 | goto end_not_compatible; |
b34cbebf MD |
4057 | } |
4058 | ||
4059 | pthread_mutex_lock(&ua_sess->lock); | |
4060 | ||
4061 | health_code_update(); | |
4062 | ||
9d6c7d3f | 4063 | /* Flushing buffers */ |
99090057 MD |
4064 | socket = consumer_find_socket_by_bitness(app->bits_per_long, |
4065 | ua_sess->consumer); | |
e3ae3c71 MD |
4066 | |
4067 | /* Flush buffers and push metadata. */ | |
4068 | switch (ua_sess->buffer_type) { | |
4069 | case LTTNG_BUFFER_PER_PID: | |
4070 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, | |
4071 | node.node) { | |
4072 | health_code_update(); | |
4073 | assert(ua_chan->is_sent); | |
4074 | ret = consumer_flush_channel(socket, ua_chan->key); | |
4075 | if (ret) { | |
4076 | ERR("Error flushing consumer channel"); | |
4077 | retval = -1; | |
4078 | continue; | |
4079 | } | |
8be98f9a | 4080 | } |
e3ae3c71 MD |
4081 | break; |
4082 | case LTTNG_BUFFER_PER_UID: | |
4083 | default: | |
4084 | assert(0); | |
4085 | break; | |
8be98f9a | 4086 | } |
8be98f9a | 4087 | |
840cb59c | 4088 | health_code_update(); |
86acf0da | 4089 | |
d88aee68 | 4090 | pthread_mutex_unlock(&ua_sess->lock); |
e3ae3c71 | 4091 | |
99090057 MD |
4092 | end_not_compatible: |
4093 | rcu_read_unlock(); | |
4094 | health_code_update(); | |
4095 | return retval; | |
4096 | } | |
4097 | ||
4098 | /* | |
e3ae3c71 MD |
4099 | * Flush buffers for all applications for a specific UST session. |
4100 | * Called with UST session lock held. | |
99090057 MD |
4101 | */ |
4102 | static | |
e3ae3c71 | 4103 | int ust_app_flush_session(struct ltt_ust_session *usess) |
99090057 MD |
4104 | |
4105 | { | |
17b1ec27 | 4106 | int ret = 0; |
99090057 | 4107 | |
e3ae3c71 | 4108 | DBG("Flushing session buffers for all ust apps"); |
99090057 MD |
4109 | |
4110 | rcu_read_lock(); | |
4111 | ||
e3ae3c71 MD |
4112 | /* Flush buffers and push metadata. */ |
4113 | switch (usess->buffer_type) { | |
4114 | case LTTNG_BUFFER_PER_UID: | |
4115 | { | |
4116 | struct buffer_reg_uid *reg; | |
4117 | struct lttng_ht_iter iter; | |
4118 | ||
4119 | /* Flush all per UID buffers associated to that session. */ | |
4120 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
4121 | struct ust_registry_session *ust_session_reg; | |
4122 | struct buffer_reg_channel *reg_chan; | |
4123 | struct consumer_socket *socket; | |
4124 | ||
4125 | /* Get consumer socket to use to push the metadata.*/ | |
4126 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
4127 | usess->consumer); | |
4128 | if (!socket) { | |
4129 | /* Ignore request if no consumer is found for the session. */ | |
4130 | continue; | |
4131 | } | |
4132 | ||
4133 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
4134 | reg_chan, node.node) { | |
4135 | /* | |
4136 | * The following call will print error values so the return | |
4137 | * code is of little importance because whatever happens, we | |
4138 | * have to try them all. | |
4139 | */ | |
4140 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
4141 | } | |
4142 | ||
4143 | ust_session_reg = reg->registry->reg.ust; | |
4144 | /* Push metadata. */ | |
4145 | (void) push_metadata(ust_session_reg, usess->consumer); | |
4146 | } | |
e3ae3c71 MD |
4147 | break; |
4148 | } | |
4149 | case LTTNG_BUFFER_PER_PID: | |
4150 | { | |
4151 | struct ust_app_session *ua_sess; | |
4152 | struct lttng_ht_iter iter; | |
4153 | struct ust_app *app; | |
4154 | ||
4155 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4156 | ua_sess = lookup_session_by_app(usess, app); | |
4157 | if (ua_sess == NULL) { | |
4158 | continue; | |
4159 | } | |
4160 | (void) ust_app_flush_app_session(app, ua_sess); | |
4161 | } | |
4162 | break; | |
4163 | } | |
4164 | default: | |
17b1ec27 | 4165 | ret = -1; |
e3ae3c71 MD |
4166 | assert(0); |
4167 | break; | |
99090057 | 4168 | } |
99090057 | 4169 | |
d88aee68 | 4170 | end_no_session: |
7db205b5 | 4171 | rcu_read_unlock(); |
840cb59c | 4172 | health_code_update(); |
99090057 | 4173 | return ret; |
8be98f9a MD |
4174 | } |
4175 | ||
84cd17c6 MD |
4176 | /* |
4177 | * Destroy a specific UST session in apps. | |
4178 | */ | |
3353de95 | 4179 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 4180 | { |
ffe60014 | 4181 | int ret; |
84cd17c6 | 4182 | struct ust_app_session *ua_sess; |
bec39940 | 4183 | struct lttng_ht_iter iter; |
d9bf3ca4 | 4184 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 4185 | |
852d0037 | 4186 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
4187 | |
4188 | rcu_read_lock(); | |
4189 | ||
e0c7ec2b DG |
4190 | if (!app->compatible) { |
4191 | goto end; | |
4192 | } | |
4193 | ||
84cd17c6 | 4194 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 4195 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 4196 | if (node == NULL) { |
d42f20df DG |
4197 | /* Session is being or is deleted. */ |
4198 | goto end; | |
84cd17c6 MD |
4199 | } |
4200 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 4201 | |
840cb59c | 4202 | health_code_update(); |
d0b96690 | 4203 | destroy_app_session(app, ua_sess); |
84cd17c6 | 4204 | |
840cb59c | 4205 | health_code_update(); |
7db205b5 | 4206 | |
84cd17c6 | 4207 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
4208 | ret = ustctl_wait_quiescent(app->sock); |
4209 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4210 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4211 | app->pid, ret); | |
4212 | } | |
e0c7ec2b DG |
4213 | end: |
4214 | rcu_read_unlock(); | |
840cb59c | 4215 | health_code_update(); |
84cd17c6 | 4216 | return 0; |
84cd17c6 MD |
4217 | } |
4218 | ||
5b4a0ec0 DG |
4219 | /* |
4220 | * Start tracing for the UST session. | |
4221 | */ | |
421cb601 DG |
4222 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
4223 | { | |
4224 | int ret = 0; | |
bec39940 | 4225 | struct lttng_ht_iter iter; |
421cb601 | 4226 | struct ust_app *app; |
48842b30 | 4227 | |
421cb601 DG |
4228 | DBG("Starting all UST traces"); |
4229 | ||
4230 | rcu_read_lock(); | |
421cb601 | 4231 | |
852d0037 | 4232 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
421cb601 | 4233 | ret = ust_app_start_trace(usess, app); |
48842b30 | 4234 | if (ret < 0) { |
5b4a0ec0 DG |
4235 | /* Continue to next apps even on error */ |
4236 | continue; | |
48842b30 | 4237 | } |
48842b30 | 4238 | } |
5b4a0ec0 | 4239 | |
48842b30 DG |
4240 | rcu_read_unlock(); |
4241 | ||
4242 | return 0; | |
4243 | } | |
487cf67c | 4244 | |
8be98f9a MD |
4245 | /* |
4246 | * Start tracing for the UST session. | |
e3ae3c71 | 4247 | * Called with UST session lock held. |
8be98f9a MD |
4248 | */ |
4249 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
4250 | { | |
4251 | int ret = 0; | |
bec39940 | 4252 | struct lttng_ht_iter iter; |
8be98f9a MD |
4253 | struct ust_app *app; |
4254 | ||
4255 | DBG("Stopping all UST traces"); | |
4256 | ||
4257 | rcu_read_lock(); | |
4258 | ||
b34cbebf MD |
4259 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4260 | ret = ust_app_stop_trace(usess, app); | |
4261 | if (ret < 0) { | |
4262 | /* Continue to next apps even on error */ | |
4263 | continue; | |
4264 | } | |
4265 | } | |
4266 | ||
e3ae3c71 | 4267 | (void) ust_app_flush_session(usess); |
8be98f9a MD |
4268 | |
4269 | rcu_read_unlock(); | |
4270 | ||
4271 | return 0; | |
4272 | } | |
4273 | ||
84cd17c6 MD |
4274 | /* |
4275 | * Destroy app UST session. | |
4276 | */ | |
4277 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
4278 | { | |
4279 | int ret = 0; | |
bec39940 | 4280 | struct lttng_ht_iter iter; |
84cd17c6 MD |
4281 | struct ust_app *app; |
4282 | ||
4283 | DBG("Destroy all UST traces"); | |
4284 | ||
4285 | rcu_read_lock(); | |
4286 | ||
852d0037 | 4287 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 4288 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
4289 | if (ret < 0) { |
4290 | /* Continue to next apps even on error */ | |
4291 | continue; | |
4292 | } | |
4293 | } | |
4294 | ||
4295 | rcu_read_unlock(); | |
4296 | ||
4297 | return 0; | |
4298 | } | |
4299 | ||
5b4a0ec0 DG |
4300 | /* |
4301 | * Add channels/events from UST global domain to registered apps at sock. | |
4302 | */ | |
487cf67c DG |
4303 | void ust_app_global_update(struct ltt_ust_session *usess, int sock) |
4304 | { | |
55c54cce | 4305 | int ret = 0; |
31746f93 | 4306 | struct lttng_ht_iter iter, uiter; |
487cf67c | 4307 | struct ust_app *app; |
3d8ca23b | 4308 | struct ust_app_session *ua_sess = NULL; |
487cf67c DG |
4309 | struct ust_app_channel *ua_chan; |
4310 | struct ust_app_event *ua_event; | |
727d5404 | 4311 | struct ust_app_ctx *ua_ctx; |
1f3580c7 | 4312 | |
95e047ff | 4313 | assert(usess); |
ffe60014 | 4314 | assert(sock >= 0); |
1f3580c7 | 4315 | |
d9bf3ca4 | 4316 | DBG2("UST app global update for app sock %d for session id %" PRIu64, sock, |
a991f516 | 4317 | usess->id); |
487cf67c | 4318 | |
284d8f55 DG |
4319 | rcu_read_lock(); |
4320 | ||
f20baf8e | 4321 | app = ust_app_find_by_sock(sock); |
487cf67c | 4322 | if (app == NULL) { |
d88aee68 DG |
4323 | /* |
4324 | * Application can be unregistered before so this is possible hence | |
4325 | * simply stopping the update. | |
4326 | */ | |
4327 | DBG3("UST app update failed to find app sock %d", sock); | |
487cf67c DG |
4328 | goto error; |
4329 | } | |
4330 | ||
e0c7ec2b DG |
4331 | if (!app->compatible) { |
4332 | goto error; | |
4333 | } | |
4334 | ||
3d8ca23b DG |
4335 | ret = create_ust_app_session(usess, app, &ua_sess, NULL); |
4336 | if (ret < 0) { | |
4337 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
4338 | goto error; |
4339 | } | |
3d8ca23b | 4340 | assert(ua_sess); |
487cf67c | 4341 | |
d0b96690 DG |
4342 | pthread_mutex_lock(&ua_sess->lock); |
4343 | ||
284d8f55 | 4344 | /* |
d0b96690 | 4345 | * We can iterate safely here over all UST app session since the create ust |
284d8f55 DG |
4346 | * app session above made a shadow copy of the UST global domain from the |
4347 | * ltt ust session. | |
4348 | */ | |
bec39940 DG |
4349 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
4350 | node.node) { | |
ad7a9107 DG |
4351 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
4352 | if (ret < 0) { | |
4353 | /* | |
4354 | * Stop everything. On error, the application failed, no more | |
4355 | * file descriptor are available or ENOMEM so stopping here is | |
4356 | * the only thing we can do for now. | |
4357 | */ | |
4358 | goto error_unlock; | |
487cf67c DG |
4359 | } |
4360 | ||
31746f93 DG |
4361 | /* |
4362 | * Add context using the list so they are enabled in the same order the | |
4363 | * user added them. | |
4364 | */ | |
4365 | cds_list_for_each_entry(ua_ctx, &ua_chan->ctx_list, list) { | |
727d5404 DG |
4366 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); |
4367 | if (ret < 0) { | |
d0b96690 | 4368 | goto error_unlock; |
727d5404 DG |
4369 | } |
4370 | } | |
4371 | ||
4372 | ||
284d8f55 | 4373 | /* For each events */ |
bec39940 DG |
4374 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
4375 | node.node) { | |
284d8f55 DG |
4376 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
4377 | if (ret < 0) { | |
d0b96690 | 4378 | goto error_unlock; |
487cf67c | 4379 | } |
36dc12cc | 4380 | } |
487cf67c DG |
4381 | } |
4382 | ||
d0b96690 DG |
4383 | pthread_mutex_unlock(&ua_sess->lock); |
4384 | ||
14fb1ebe | 4385 | if (usess->active) { |
421cb601 | 4386 | ret = ust_app_start_trace(usess, app); |
36dc12cc | 4387 | if (ret < 0) { |
36dc12cc DG |
4388 | goto error; |
4389 | } | |
4390 | ||
852d0037 | 4391 | DBG2("UST trace started for app pid %d", app->pid); |
36dc12cc DG |
4392 | } |
4393 | ||
ffe60014 DG |
4394 | /* Everything went well at this point. */ |
4395 | rcu_read_unlock(); | |
4396 | return; | |
4397 | ||
d0b96690 DG |
4398 | error_unlock: |
4399 | pthread_mutex_unlock(&ua_sess->lock); | |
487cf67c | 4400 | error: |
ffe60014 | 4401 | if (ua_sess) { |
d0b96690 | 4402 | destroy_app_session(app, ua_sess); |
ffe60014 | 4403 | } |
487cf67c DG |
4404 | rcu_read_unlock(); |
4405 | return; | |
4406 | } | |
55cc08a6 DG |
4407 | |
4408 | /* | |
4409 | * Add context to a specific channel for global UST domain. | |
4410 | */ | |
4411 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
4412 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
4413 | { | |
4414 | int ret = 0; | |
bec39940 DG |
4415 | struct lttng_ht_node_str *ua_chan_node; |
4416 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
4417 | struct ust_app_channel *ua_chan = NULL; |
4418 | struct ust_app_session *ua_sess; | |
4419 | struct ust_app *app; | |
4420 | ||
4421 | rcu_read_lock(); | |
4422 | ||
852d0037 | 4423 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4424 | if (!app->compatible) { |
4425 | /* | |
4426 | * TODO: In time, we should notice the caller of this error by | |
4427 | * telling him that this is a version error. | |
4428 | */ | |
4429 | continue; | |
4430 | } | |
55cc08a6 DG |
4431 | ua_sess = lookup_session_by_app(usess, app); |
4432 | if (ua_sess == NULL) { | |
4433 | continue; | |
4434 | } | |
4435 | ||
d0b96690 | 4436 | pthread_mutex_lock(&ua_sess->lock); |
55cc08a6 | 4437 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4438 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4439 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 4440 | if (ua_chan_node == NULL) { |
d0b96690 | 4441 | goto next_app; |
55cc08a6 DG |
4442 | } |
4443 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
4444 | node); | |
55cc08a6 DG |
4445 | ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app); |
4446 | if (ret < 0) { | |
d0b96690 | 4447 | goto next_app; |
55cc08a6 | 4448 | } |
d0b96690 DG |
4449 | next_app: |
4450 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
4451 | } |
4452 | ||
55cc08a6 DG |
4453 | rcu_read_unlock(); |
4454 | return ret; | |
4455 | } | |
4456 | ||
76d45b40 DG |
4457 | /* |
4458 | * Enable event for a channel from a UST session for a specific PID. | |
4459 | */ | |
4460 | int ust_app_enable_event_pid(struct ltt_ust_session *usess, | |
4461 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4462 | { | |
4463 | int ret = 0; | |
bec39940 | 4464 | struct lttng_ht_iter iter; |
18eace3b | 4465 | struct lttng_ht_node_str *ua_chan_node; |
76d45b40 DG |
4466 | struct ust_app *app; |
4467 | struct ust_app_session *ua_sess; | |
4468 | struct ust_app_channel *ua_chan; | |
4469 | struct ust_app_event *ua_event; | |
4470 | ||
4471 | DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid); | |
4472 | ||
4473 | rcu_read_lock(); | |
4474 | ||
4475 | app = ust_app_find_by_pid(pid); | |
4476 | if (app == NULL) { | |
4477 | ERR("UST app enable event per PID %d not found", pid); | |
4478 | ret = -1; | |
d0b96690 | 4479 | goto end; |
76d45b40 DG |
4480 | } |
4481 | ||
e0c7ec2b DG |
4482 | if (!app->compatible) { |
4483 | ret = 0; | |
d0b96690 | 4484 | goto end; |
e0c7ec2b DG |
4485 | } |
4486 | ||
76d45b40 | 4487 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4488 | if (!ua_sess) { |
4489 | /* The application has problem or is probably dead. */ | |
d0b96690 DG |
4490 | ret = 0; |
4491 | goto end; | |
c4a1715b | 4492 | } |
76d45b40 | 4493 | |
d0b96690 | 4494 | pthread_mutex_lock(&ua_sess->lock); |
76d45b40 | 4495 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4496 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4497 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
76d45b40 DG |
4498 | /* If the channel is not found, there is a code flow error */ |
4499 | assert(ua_chan_node); | |
4500 | ||
4501 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4502 | ||
18eace3b | 4503 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 4504 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 4505 | if (ua_event == NULL) { |
76d45b40 DG |
4506 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
4507 | if (ret < 0) { | |
d0b96690 | 4508 | goto end_unlock; |
76d45b40 DG |
4509 | } |
4510 | } else { | |
76d45b40 DG |
4511 | ret = enable_ust_app_event(ua_sess, ua_event, app); |
4512 | if (ret < 0) { | |
d0b96690 | 4513 | goto end_unlock; |
76d45b40 DG |
4514 | } |
4515 | } | |
4516 | ||
d0b96690 DG |
4517 | end_unlock: |
4518 | pthread_mutex_unlock(&ua_sess->lock); | |
4519 | end: | |
76d45b40 DG |
4520 | rcu_read_unlock(); |
4521 | return ret; | |
4522 | } | |
7f79d3a1 | 4523 | |
4466912f DG |
4524 | /* |
4525 | * Calibrate registered applications. | |
4526 | */ | |
4527 | int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate) | |
4528 | { | |
4529 | int ret = 0; | |
4530 | struct lttng_ht_iter iter; | |
4531 | struct ust_app *app; | |
4532 | ||
4533 | rcu_read_lock(); | |
4534 | ||
852d0037 | 4535 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4466912f DG |
4536 | if (!app->compatible) { |
4537 | /* | |
4538 | * TODO: In time, we should notice the caller of this error by | |
4539 | * telling him that this is a version error. | |
4540 | */ | |
4541 | continue; | |
4542 | } | |
4543 | ||
840cb59c | 4544 | health_code_update(); |
86acf0da | 4545 | |
852d0037 | 4546 | ret = ustctl_calibrate(app->sock, calibrate); |
4466912f DG |
4547 | if (ret < 0) { |
4548 | switch (ret) { | |
4549 | case -ENOSYS: | |
4550 | /* Means that it's not implemented on the tracer side. */ | |
4551 | ret = 0; | |
4552 | break; | |
4553 | default: | |
4466912f | 4554 | DBG2("Calibrate app PID %d returned with error %d", |
852d0037 | 4555 | app->pid, ret); |
4466912f DG |
4556 | break; |
4557 | } | |
4558 | } | |
4559 | } | |
4560 | ||
4561 | DBG("UST app global domain calibration finished"); | |
4562 | ||
4563 | rcu_read_unlock(); | |
4564 | ||
840cb59c | 4565 | health_code_update(); |
86acf0da | 4566 | |
4466912f DG |
4567 | return ret; |
4568 | } | |
d0b96690 DG |
4569 | |
4570 | /* | |
4571 | * Receive registration and populate the given msg structure. | |
4572 | * | |
4573 | * On success return 0 else a negative value returned by the ustctl call. | |
4574 | */ | |
4575 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
4576 | { | |
4577 | int ret; | |
4578 | uint32_t pid, ppid, uid, gid; | |
4579 | ||
4580 | assert(msg); | |
4581 | ||
4582 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
4583 | &pid, &ppid, &uid, &gid, | |
4584 | &msg->bits_per_long, | |
4585 | &msg->uint8_t_alignment, | |
4586 | &msg->uint16_t_alignment, | |
4587 | &msg->uint32_t_alignment, | |
4588 | &msg->uint64_t_alignment, | |
4589 | &msg->long_alignment, | |
4590 | &msg->byte_order, | |
4591 | msg->name); | |
4592 | if (ret < 0) { | |
4593 | switch (-ret) { | |
4594 | case EPIPE: | |
4595 | case ECONNRESET: | |
4596 | case LTTNG_UST_ERR_EXITING: | |
4597 | DBG3("UST app recv reg message failed. Application died"); | |
4598 | break; | |
4599 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
4600 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
4601 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
4602 | LTTNG_UST_ABI_MINOR_VERSION); | |
4603 | break; | |
4604 | default: | |
4605 | ERR("UST app recv reg message failed with ret %d", ret); | |
4606 | break; | |
4607 | } | |
4608 | goto error; | |
4609 | } | |
4610 | msg->pid = (pid_t) pid; | |
4611 | msg->ppid = (pid_t) ppid; | |
4612 | msg->uid = (uid_t) uid; | |
4613 | msg->gid = (gid_t) gid; | |
4614 | ||
4615 | error: | |
4616 | return ret; | |
4617 | } | |
4618 | ||
d88aee68 DG |
4619 | /* |
4620 | * Return a ust app channel object using the application object and the channel | |
4621 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
4622 | * lock MUST be acquired before calling this function. | |
4623 | */ | |
d0b96690 DG |
4624 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
4625 | int objd) | |
4626 | { | |
4627 | struct lttng_ht_node_ulong *node; | |
4628 | struct lttng_ht_iter iter; | |
4629 | struct ust_app_channel *ua_chan = NULL; | |
4630 | ||
4631 | assert(app); | |
4632 | ||
4633 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
4634 | node = lttng_ht_iter_get_node_ulong(&iter); | |
4635 | if (node == NULL) { | |
4636 | DBG2("UST app channel find by objd %d not found", objd); | |
4637 | goto error; | |
4638 | } | |
4639 | ||
4640 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
4641 | ||
4642 | error: | |
4643 | return ua_chan; | |
4644 | } | |
4645 | ||
d88aee68 DG |
4646 | /* |
4647 | * Reply to a register channel notification from an application on the notify | |
4648 | * socket. The channel metadata is also created. | |
4649 | * | |
4650 | * The session UST registry lock is acquired in this function. | |
4651 | * | |
4652 | * On success 0 is returned else a negative value. | |
4653 | */ | |
d0b96690 DG |
4654 | static int reply_ust_register_channel(int sock, int sobjd, int cobjd, |
4655 | size_t nr_fields, struct ustctl_field *fields) | |
4656 | { | |
4657 | int ret, ret_code = 0; | |
4658 | uint32_t chan_id, reg_count; | |
7972aab2 | 4659 | uint64_t chan_reg_key; |
d0b96690 DG |
4660 | enum ustctl_channel_header type; |
4661 | struct ust_app *app; | |
4662 | struct ust_app_channel *ua_chan; | |
4663 | struct ust_app_session *ua_sess; | |
7972aab2 | 4664 | struct ust_registry_session *registry; |
45893984 | 4665 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
4666 | |
4667 | rcu_read_lock(); | |
4668 | ||
4669 | /* Lookup application. If not found, there is a code flow error. */ | |
4670 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4671 | if (!app) { |
4672 | DBG("Application socket %d is being teardown. Abort event notify", | |
4673 | sock); | |
4674 | ret = 0; | |
d5d629b5 | 4675 | free(fields); |
d88aee68 DG |
4676 | goto error_rcu_unlock; |
4677 | } | |
d0b96690 | 4678 | |
4950b860 | 4679 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4680 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4681 | if (!ua_chan) { |
4682 | DBG("Application channel is being teardown. Abort event notify"); | |
4683 | ret = 0; | |
d5d629b5 | 4684 | free(fields); |
4950b860 MD |
4685 | goto error_rcu_unlock; |
4686 | } | |
4687 | ||
d0b96690 DG |
4688 | assert(ua_chan->session); |
4689 | ua_sess = ua_chan->session; | |
d0b96690 | 4690 | |
7972aab2 DG |
4691 | /* Get right session registry depending on the session buffer type. */ |
4692 | registry = get_session_registry(ua_sess); | |
4693 | assert(registry); | |
45893984 | 4694 | |
7972aab2 DG |
4695 | /* Depending on the buffer type, a different channel key is used. */ |
4696 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4697 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 4698 | } else { |
7972aab2 | 4699 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
4700 | } |
4701 | ||
7972aab2 DG |
4702 | pthread_mutex_lock(®istry->lock); |
4703 | ||
4704 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
4705 | assert(chan_reg); | |
4706 | ||
4707 | if (!chan_reg->register_done) { | |
4708 | reg_count = ust_registry_get_event_count(chan_reg); | |
4709 | if (reg_count < 31) { | |
4710 | type = USTCTL_CHANNEL_HEADER_COMPACT; | |
4711 | } else { | |
4712 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
4713 | } | |
4714 | ||
4715 | chan_reg->nr_ctx_fields = nr_fields; | |
4716 | chan_reg->ctx_fields = fields; | |
4717 | chan_reg->header_type = type; | |
d0b96690 | 4718 | } else { |
7972aab2 DG |
4719 | /* Get current already assigned values. */ |
4720 | type = chan_reg->header_type; | |
d5d629b5 DG |
4721 | free(fields); |
4722 | /* Set to NULL so the error path does not do a double free. */ | |
4723 | fields = NULL; | |
d0b96690 | 4724 | } |
7972aab2 DG |
4725 | /* Channel id is set during the object creation. */ |
4726 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
4727 | |
4728 | /* Append to metadata */ | |
7972aab2 DG |
4729 | if (!chan_reg->metadata_dumped) { |
4730 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
4731 | if (ret_code) { |
4732 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
4733 | goto reply; | |
4734 | } | |
4735 | } | |
4736 | ||
4737 | reply: | |
7972aab2 DG |
4738 | DBG3("UST app replying to register channel key %" PRIu64 |
4739 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
4740 | ret_code); | |
d0b96690 DG |
4741 | |
4742 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
4743 | if (ret < 0) { | |
4744 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4745 | ERR("UST app reply channel failed with ret %d", ret); | |
4746 | } else { | |
4747 | DBG3("UST app reply channel failed. Application died"); | |
4748 | } | |
4749 | goto error; | |
4750 | } | |
4751 | ||
7972aab2 DG |
4752 | /* This channel registry registration is completed. */ |
4753 | chan_reg->register_done = 1; | |
4754 | ||
d0b96690 | 4755 | error: |
7972aab2 | 4756 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4757 | error_rcu_unlock: |
d0b96690 | 4758 | rcu_read_unlock(); |
d5d629b5 DG |
4759 | if (ret) { |
4760 | free(fields); | |
4761 | } | |
d0b96690 DG |
4762 | return ret; |
4763 | } | |
4764 | ||
d88aee68 DG |
4765 | /* |
4766 | * Add event to the UST channel registry. When the event is added to the | |
4767 | * registry, the metadata is also created. Once done, this replies to the | |
4768 | * application with the appropriate error code. | |
4769 | * | |
4770 | * The session UST registry lock is acquired in the function. | |
4771 | * | |
4772 | * On success 0 is returned else a negative value. | |
4773 | */ | |
d0b96690 DG |
4774 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
4775 | char *sig, size_t nr_fields, struct ustctl_field *fields, int loglevel, | |
4776 | char *model_emf_uri) | |
4777 | { | |
4778 | int ret, ret_code; | |
4779 | uint32_t event_id = 0; | |
7972aab2 | 4780 | uint64_t chan_reg_key; |
d0b96690 DG |
4781 | struct ust_app *app; |
4782 | struct ust_app_channel *ua_chan; | |
4783 | struct ust_app_session *ua_sess; | |
7972aab2 | 4784 | struct ust_registry_session *registry; |
d0b96690 DG |
4785 | |
4786 | rcu_read_lock(); | |
4787 | ||
4788 | /* Lookup application. If not found, there is a code flow error. */ | |
4789 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4790 | if (!app) { |
4791 | DBG("Application socket %d is being teardown. Abort event notify", | |
4792 | sock); | |
4793 | ret = 0; | |
d5d629b5 DG |
4794 | free(sig); |
4795 | free(fields); | |
4796 | free(model_emf_uri); | |
d88aee68 DG |
4797 | goto error_rcu_unlock; |
4798 | } | |
d0b96690 | 4799 | |
4950b860 | 4800 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4801 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4802 | if (!ua_chan) { |
4803 | DBG("Application channel is being teardown. Abort event notify"); | |
4804 | ret = 0; | |
d5d629b5 DG |
4805 | free(sig); |
4806 | free(fields); | |
4807 | free(model_emf_uri); | |
4950b860 MD |
4808 | goto error_rcu_unlock; |
4809 | } | |
4810 | ||
d0b96690 DG |
4811 | assert(ua_chan->session); |
4812 | ua_sess = ua_chan->session; | |
4813 | ||
7972aab2 DG |
4814 | registry = get_session_registry(ua_sess); |
4815 | assert(registry); | |
4816 | ||
4817 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4818 | chan_reg_key = ua_chan->tracing_channel_id; | |
4819 | } else { | |
4820 | chan_reg_key = ua_chan->key; | |
4821 | } | |
4822 | ||
4823 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 4824 | |
d5d629b5 DG |
4825 | /* |
4826 | * From this point on, this call acquires the ownership of the sig, fields | |
4827 | * and model_emf_uri meaning any free are done inside it if needed. These | |
4828 | * three variables MUST NOT be read/write after this. | |
4829 | */ | |
7972aab2 | 4830 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
45893984 | 4831 | sobjd, cobjd, name, sig, nr_fields, fields, loglevel, |
8494bda5 MD |
4832 | model_emf_uri, ua_sess->buffer_type, &event_id, |
4833 | app); | |
d0b96690 DG |
4834 | |
4835 | /* | |
4836 | * The return value is returned to ustctl so in case of an error, the | |
4837 | * application can be notified. In case of an error, it's important not to | |
4838 | * return a negative error or else the application will get closed. | |
4839 | */ | |
4840 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
4841 | if (ret < 0) { | |
4842 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4843 | ERR("UST app reply event failed with ret %d", ret); | |
4844 | } else { | |
4845 | DBG3("UST app reply event failed. Application died"); | |
4846 | } | |
4847 | /* | |
4848 | * No need to wipe the create event since the application socket will | |
4849 | * get close on error hence cleaning up everything by itself. | |
4850 | */ | |
4851 | goto error; | |
4852 | } | |
4853 | ||
7972aab2 DG |
4854 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
4855 | name, event_id); | |
d88aee68 | 4856 | |
d0b96690 | 4857 | error: |
7972aab2 | 4858 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4859 | error_rcu_unlock: |
d0b96690 DG |
4860 | rcu_read_unlock(); |
4861 | return ret; | |
4862 | } | |
4863 | ||
d88aee68 DG |
4864 | /* |
4865 | * Handle application notification through the given notify socket. | |
4866 | * | |
4867 | * Return 0 on success or else a negative value. | |
4868 | */ | |
d0b96690 DG |
4869 | int ust_app_recv_notify(int sock) |
4870 | { | |
4871 | int ret; | |
4872 | enum ustctl_notify_cmd cmd; | |
4873 | ||
4874 | DBG3("UST app receiving notify from sock %d", sock); | |
4875 | ||
4876 | ret = ustctl_recv_notify(sock, &cmd); | |
4877 | if (ret < 0) { | |
4878 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4879 | ERR("UST app recv notify failed with ret %d", ret); | |
4880 | } else { | |
4881 | DBG3("UST app recv notify failed. Application died"); | |
4882 | } | |
4883 | goto error; | |
4884 | } | |
4885 | ||
4886 | switch (cmd) { | |
4887 | case USTCTL_NOTIFY_CMD_EVENT: | |
4888 | { | |
4889 | int sobjd, cobjd, loglevel; | |
4890 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; | |
4891 | size_t nr_fields; | |
4892 | struct ustctl_field *fields; | |
4893 | ||
4894 | DBG2("UST app ustctl register event received"); | |
4895 | ||
4896 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, &loglevel, | |
4897 | &sig, &nr_fields, &fields, &model_emf_uri); | |
4898 | if (ret < 0) { | |
4899 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4900 | ERR("UST app recv event failed with ret %d", ret); | |
4901 | } else { | |
4902 | DBG3("UST app recv event failed. Application died"); | |
4903 | } | |
4904 | goto error; | |
4905 | } | |
4906 | ||
d5d629b5 DG |
4907 | /* |
4908 | * Add event to the UST registry coming from the notify socket. This | |
4909 | * call will free if needed the sig, fields and model_emf_uri. This | |
4910 | * code path loses the ownsership of these variables and transfer them | |
4911 | * to the this function. | |
4912 | */ | |
d0b96690 DG |
4913 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
4914 | fields, loglevel, model_emf_uri); | |
4915 | if (ret < 0) { | |
4916 | goto error; | |
4917 | } | |
4918 | ||
4919 | break; | |
4920 | } | |
4921 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
4922 | { | |
4923 | int sobjd, cobjd; | |
4924 | size_t nr_fields; | |
4925 | struct ustctl_field *fields; | |
4926 | ||
4927 | DBG2("UST app ustctl register channel received"); | |
4928 | ||
4929 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
4930 | &fields); | |
4931 | if (ret < 0) { | |
4932 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4933 | ERR("UST app recv channel failed with ret %d", ret); | |
4934 | } else { | |
4935 | DBG3("UST app recv channel failed. Application died"); | |
4936 | } | |
4937 | goto error; | |
4938 | } | |
4939 | ||
d5d629b5 DG |
4940 | /* |
4941 | * The fields ownership are transfered to this function call meaning | |
4942 | * that if needed it will be freed. After this, it's invalid to access | |
4943 | * fields or clean it up. | |
4944 | */ | |
d0b96690 DG |
4945 | ret = reply_ust_register_channel(sock, sobjd, cobjd, nr_fields, |
4946 | fields); | |
4947 | if (ret < 0) { | |
4948 | goto error; | |
4949 | } | |
4950 | ||
4951 | break; | |
4952 | } | |
4953 | default: | |
4954 | /* Should NEVER happen. */ | |
4955 | assert(0); | |
4956 | } | |
4957 | ||
4958 | error: | |
4959 | return ret; | |
4960 | } | |
d88aee68 DG |
4961 | |
4962 | /* | |
4963 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
4964 | * corresponding application. On failure, the call_rcu to close the socket is | |
4965 | * executed. If an application is found, it tries to delete it from the notify | |
4966 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
4967 | * | |
4968 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
4969 | * call RCU is not done but the rest of the cleanup is. | |
4970 | */ | |
4971 | void ust_app_notify_sock_unregister(int sock) | |
4972 | { | |
4973 | int err_enomem = 0; | |
4974 | struct lttng_ht_iter iter; | |
4975 | struct ust_app *app; | |
4976 | struct ust_app_notify_sock_obj *obj; | |
4977 | ||
4978 | assert(sock >= 0); | |
4979 | ||
4980 | rcu_read_lock(); | |
4981 | ||
4982 | obj = zmalloc(sizeof(*obj)); | |
4983 | if (!obj) { | |
4984 | /* | |
4985 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
4986 | * procedure but the call_rcu will not be called. In this case, we | |
4987 | * accept the fd leak rather than possibly creating an unsynchronized | |
4988 | * state between threads. | |
4989 | * | |
4990 | * TODO: The notify object should be created once the notify socket is | |
4991 | * registered and stored independantely from the ust app object. The | |
4992 | * tricky part is to synchronize the teardown of the application and | |
4993 | * this notify object. Let's keep that in mind so we can avoid this | |
4994 | * kind of shenanigans with ENOMEM in the teardown path. | |
4995 | */ | |
4996 | err_enomem = 1; | |
4997 | } else { | |
4998 | obj->fd = sock; | |
4999 | } | |
5000 | ||
5001 | DBG("UST app notify socket unregister %d", sock); | |
5002 | ||
5003 | /* | |
5004 | * Lookup application by notify socket. If this fails, this means that the | |
5005 | * hash table delete has already been done by the application | |
5006 | * unregistration process so we can safely close the notify socket in a | |
5007 | * call RCU. | |
5008 | */ | |
5009 | app = find_app_by_notify_sock(sock); | |
5010 | if (!app) { | |
5011 | goto close_socket; | |
5012 | } | |
5013 | ||
5014 | iter.iter.node = &app->notify_sock_n.node; | |
5015 | ||
5016 | /* | |
5017 | * Whatever happens here either we fail or succeed, in both cases we have | |
5018 | * to close the socket after a grace period to continue to the call RCU | |
5019 | * here. If the deletion is successful, the application is not visible | |
5020 | * anymore by other threads and is it fails it means that it was already | |
5021 | * deleted from the hash table so either way we just have to close the | |
5022 | * socket. | |
5023 | */ | |
5024 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
5025 | ||
5026 | close_socket: | |
5027 | rcu_read_unlock(); | |
5028 | ||
5029 | /* | |
5030 | * Close socket after a grace period to avoid for the socket to be reused | |
5031 | * before the application object is freed creating potential race between | |
5032 | * threads trying to add unique in the global hash table. | |
5033 | */ | |
5034 | if (!err_enomem) { | |
5035 | call_rcu(&obj->head, close_notify_sock_rcu); | |
5036 | } | |
5037 | } | |
f45e313d DG |
5038 | |
5039 | /* | |
5040 | * Destroy a ust app data structure and free its memory. | |
5041 | */ | |
5042 | void ust_app_destroy(struct ust_app *app) | |
5043 | { | |
5044 | if (!app) { | |
5045 | return; | |
5046 | } | |
5047 | ||
5048 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
5049 | } | |
6dc3064a DG |
5050 | |
5051 | /* | |
5052 | * Take a snapshot for a given UST session. The snapshot is sent to the given | |
5053 | * output. | |
5054 | * | |
5055 | * Return 0 on success or else a negative value. | |
5056 | */ | |
5057 | int ust_app_snapshot_record(struct ltt_ust_session *usess, | |
135347bd MD |
5058 | struct snapshot_output *output, int wait, |
5059 | uint64_t nb_packets_per_stream) | |
6dc3064a DG |
5060 | { |
5061 | int ret = 0; | |
7badf927 | 5062 | unsigned int snapshot_done = 0; |
6dc3064a DG |
5063 | struct lttng_ht_iter iter; |
5064 | struct ust_app *app; | |
af706bb7 | 5065 | char pathname[PATH_MAX]; |
6dc3064a DG |
5066 | |
5067 | assert(usess); | |
5068 | assert(output); | |
5069 | ||
5070 | rcu_read_lock(); | |
5071 | ||
8c924c7b MD |
5072 | switch (usess->buffer_type) { |
5073 | case LTTNG_BUFFER_PER_UID: | |
5074 | { | |
5075 | struct buffer_reg_uid *reg; | |
6dc3064a | 5076 | |
8c924c7b MD |
5077 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
5078 | struct buffer_reg_channel *reg_chan; | |
5079 | struct consumer_socket *socket; | |
6dc3064a | 5080 | |
8c924c7b MD |
5081 | /* Get consumer socket to use to push the metadata.*/ |
5082 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
5083 | usess->consumer); | |
5084 | if (!socket) { | |
5085 | ret = -EINVAL; | |
5086 | goto error; | |
5087 | } | |
6dc3064a | 5088 | |
8c924c7b MD |
5089 | memset(pathname, 0, sizeof(pathname)); |
5090 | ret = snprintf(pathname, sizeof(pathname), | |
5091 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH, | |
5092 | reg->uid, reg->bits_per_long); | |
5093 | if (ret < 0) { | |
5094 | PERROR("snprintf snapshot path"); | |
5095 | goto error; | |
5096 | } | |
5097 | ||
5098 | /* Add the UST default trace dir to path. */ | |
5099 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
5100 | reg_chan, node.node) { | |
68808f4e DG |
5101 | ret = consumer_snapshot_channel(socket, reg_chan->consumer_key, |
5102 | output, 0, usess->uid, usess->gid, pathname, wait, | |
135347bd | 5103 | nb_packets_per_stream); |
8c924c7b MD |
5104 | if (ret < 0) { |
5105 | goto error; | |
5106 | } | |
5107 | } | |
68808f4e DG |
5108 | ret = consumer_snapshot_channel(socket, |
5109 | reg->registry->reg.ust->metadata_key, output, 1, | |
135347bd | 5110 | usess->uid, usess->gid, pathname, wait, 0); |
8c924c7b MD |
5111 | if (ret < 0) { |
5112 | goto error; | |
5113 | } | |
7badf927 | 5114 | snapshot_done = 1; |
af706bb7 | 5115 | } |
8c924c7b MD |
5116 | break; |
5117 | } | |
5118 | case LTTNG_BUFFER_PER_PID: | |
5119 | { | |
5120 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5121 | struct consumer_socket *socket; | |
5122 | struct lttng_ht_iter chan_iter; | |
5123 | struct ust_app_channel *ua_chan; | |
5124 | struct ust_app_session *ua_sess; | |
5125 | struct ust_registry_session *registry; | |
5126 | ||
5127 | ua_sess = lookup_session_by_app(usess, app); | |
5128 | if (!ua_sess) { | |
5129 | /* Session not associated with this app. */ | |
5130 | continue; | |
5131 | } | |
af706bb7 | 5132 | |
8c924c7b MD |
5133 | /* Get the right consumer socket for the application. */ |
5134 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
5135 | output->consumer); | |
5136 | if (!socket) { | |
5c786ded | 5137 | ret = -EINVAL; |
5c786ded JD |
5138 | goto error; |
5139 | } | |
5140 | ||
8c924c7b MD |
5141 | /* Add the UST default trace dir to path. */ |
5142 | memset(pathname, 0, sizeof(pathname)); | |
5143 | ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "/%s", | |
5144 | ua_sess->path); | |
6dc3064a | 5145 | if (ret < 0) { |
8c924c7b | 5146 | PERROR("snprintf snapshot path"); |
6dc3064a DG |
5147 | goto error; |
5148 | } | |
6dc3064a | 5149 | |
8c924c7b MD |
5150 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, |
5151 | ua_chan, node.node) { | |
68808f4e DG |
5152 | ret = consumer_snapshot_channel(socket, ua_chan->key, output, |
5153 | 0, ua_sess->euid, ua_sess->egid, pathname, wait, | |
135347bd | 5154 | nb_packets_per_stream); |
8c924c7b MD |
5155 | if (ret < 0) { |
5156 | goto error; | |
5157 | } | |
5158 | } | |
5159 | ||
5160 | registry = get_session_registry(ua_sess); | |
5161 | assert(registry); | |
5162 | ret = consumer_snapshot_channel(socket, registry->metadata_key, output, | |
135347bd | 5163 | 1, ua_sess->euid, ua_sess->egid, pathname, wait, 0); |
8c924c7b MD |
5164 | if (ret < 0) { |
5165 | goto error; | |
5166 | } | |
7badf927 | 5167 | snapshot_done = 1; |
8c924c7b MD |
5168 | } |
5169 | break; | |
5170 | } | |
5171 | default: | |
5172 | assert(0); | |
5173 | break; | |
6dc3064a DG |
5174 | } |
5175 | ||
7badf927 DG |
5176 | if (!snapshot_done) { |
5177 | /* | |
5178 | * If no snapshot was made and we are not in the error path, this means | |
5179 | * that there are no buffers thus no (prior) application to snapshot | |
5180 | * data from so we have simply NO data. | |
5181 | */ | |
5182 | ret = -ENODATA; | |
5183 | } | |
5184 | ||
6dc3064a DG |
5185 | error: |
5186 | rcu_read_unlock(); | |
5187 | return ret; | |
5188 | } | |
5c786ded JD |
5189 | |
5190 | /* | |
135347bd | 5191 | * Return the size taken by one more packet per stream. |
5c786ded | 5192 | */ |
135347bd MD |
5193 | uint64_t ust_app_get_size_one_more_packet_per_stream(struct ltt_ust_session *usess, |
5194 | uint64_t cur_nr_packets) | |
5c786ded | 5195 | { |
135347bd | 5196 | uint64_t tot_size = 0; |
5c786ded JD |
5197 | struct ust_app *app; |
5198 | struct lttng_ht_iter iter; | |
5199 | ||
5200 | assert(usess); | |
5201 | ||
5202 | switch (usess->buffer_type) { | |
5203 | case LTTNG_BUFFER_PER_UID: | |
5204 | { | |
5205 | struct buffer_reg_uid *reg; | |
5206 | ||
5207 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
5208 | struct buffer_reg_channel *reg_chan; | |
5209 | ||
71f3589f | 5210 | rcu_read_lock(); |
5c786ded JD |
5211 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
5212 | reg_chan, node.node) { | |
135347bd MD |
5213 | if (cur_nr_packets >= reg_chan->num_subbuf) { |
5214 | /* | |
5215 | * Don't take channel into account if we | |
5216 | * already grab all its packets. | |
5217 | */ | |
5218 | continue; | |
5219 | } | |
5220 | tot_size += reg_chan->subbuf_size * reg_chan->stream_count; | |
5c786ded | 5221 | } |
71f3589f | 5222 | rcu_read_unlock(); |
5c786ded JD |
5223 | } |
5224 | break; | |
5225 | } | |
5226 | case LTTNG_BUFFER_PER_PID: | |
5227 | { | |
5228 | rcu_read_lock(); | |
5229 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5230 | struct ust_app_channel *ua_chan; | |
5231 | struct ust_app_session *ua_sess; | |
5232 | struct lttng_ht_iter chan_iter; | |
5233 | ||
5234 | ua_sess = lookup_session_by_app(usess, app); | |
5235 | if (!ua_sess) { | |
5236 | /* Session not associated with this app. */ | |
5237 | continue; | |
5238 | } | |
5239 | ||
5240 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
5241 | ua_chan, node.node) { | |
135347bd MD |
5242 | if (cur_nr_packets >= ua_chan->attr.num_subbuf) { |
5243 | /* | |
5244 | * Don't take channel into account if we | |
5245 | * already grab all its packets. | |
5246 | */ | |
5247 | continue; | |
5248 | } | |
5249 | tot_size += ua_chan->attr.subbuf_size * ua_chan->streams.count; | |
5c786ded JD |
5250 | } |
5251 | } | |
5252 | rcu_read_unlock(); | |
5253 | break; | |
5254 | } | |
5255 | default: | |
5256 | assert(0); | |
5257 | break; | |
5258 | } | |
5259 | ||
135347bd | 5260 | return tot_size; |
5c786ded | 5261 | } |