Commit | Line | Data |
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91d76f53 DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * | |
d14d33bf AM |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License, version 2 only, | |
6 | * as published by the Free Software Foundation. | |
91d76f53 DG |
7 | * |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
d14d33bf AM |
13 | * You should have received a copy of the GNU General Public License along |
14 | * with this program; if not, write to the Free Software Foundation, Inc., | |
15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
91d76f53 DG |
16 | */ |
17 | ||
18 | #define _GNU_SOURCE | |
6c1c0768 | 19 | #define _LGPL_SOURCE |
91d76f53 | 20 | #include <errno.h> |
7972aab2 | 21 | #include <inttypes.h> |
91d76f53 DG |
22 | #include <pthread.h> |
23 | #include <stdio.h> | |
24 | #include <stdlib.h> | |
099e26bd | 25 | #include <string.h> |
aba8e916 DG |
26 | #include <sys/stat.h> |
27 | #include <sys/types.h> | |
099e26bd | 28 | #include <unistd.h> |
0df502fd | 29 | #include <urcu/compiler.h> |
fb54cdbf | 30 | #include <lttng/ust-error.h> |
331744e3 | 31 | #include <signal.h> |
bec39940 | 32 | |
990570ed | 33 | #include <common/common.h> |
86acf0da | 34 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 35 | |
7972aab2 | 36 | #include "buffer-registry.h" |
86acf0da | 37 | #include "fd-limit.h" |
8782cc74 | 38 | #include "health-sessiond.h" |
56fff090 | 39 | #include "ust-app.h" |
48842b30 | 40 | #include "ust-consumer.h" |
d80a6244 | 41 | #include "ust-ctl.h" |
0b2dc8df | 42 | #include "utils.h" |
d80a6244 | 43 | |
c4b88406 MD |
44 | static |
45 | int ust_app_flush_app_session(struct ust_app *app, struct ust_app_session *ua_sess); | |
46 | ||
d9bf3ca4 MD |
47 | /* Next available channel key. Access under next_channel_key_lock. */ |
48 | static uint64_t _next_channel_key; | |
49 | static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER; | |
50 | ||
51 | /* Next available session ID. Access under next_session_id_lock. */ | |
52 | static uint64_t _next_session_id; | |
53 | static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER; | |
ffe60014 DG |
54 | |
55 | /* | |
d9bf3ca4 | 56 | * Return the incremented value of next_channel_key. |
ffe60014 | 57 | */ |
d9bf3ca4 | 58 | static uint64_t get_next_channel_key(void) |
ffe60014 | 59 | { |
d9bf3ca4 MD |
60 | uint64_t ret; |
61 | ||
62 | pthread_mutex_lock(&next_channel_key_lock); | |
63 | ret = ++_next_channel_key; | |
64 | pthread_mutex_unlock(&next_channel_key_lock); | |
65 | return ret; | |
ffe60014 DG |
66 | } |
67 | ||
68 | /* | |
7972aab2 | 69 | * Return the atomically incremented value of next_session_id. |
ffe60014 | 70 | */ |
d9bf3ca4 | 71 | static uint64_t get_next_session_id(void) |
ffe60014 | 72 | { |
d9bf3ca4 MD |
73 | uint64_t ret; |
74 | ||
75 | pthread_mutex_lock(&next_session_id_lock); | |
76 | ret = ++_next_session_id; | |
77 | pthread_mutex_unlock(&next_session_id_lock); | |
78 | return ret; | |
ffe60014 DG |
79 | } |
80 | ||
d65d2de8 DG |
81 | static void copy_channel_attr_to_ustctl( |
82 | struct ustctl_consumer_channel_attr *attr, | |
83 | struct lttng_ust_channel_attr *uattr) | |
84 | { | |
85 | /* Copy event attributes since the layout is different. */ | |
86 | attr->subbuf_size = uattr->subbuf_size; | |
87 | attr->num_subbuf = uattr->num_subbuf; | |
88 | attr->overwrite = uattr->overwrite; | |
89 | attr->switch_timer_interval = uattr->switch_timer_interval; | |
90 | attr->read_timer_interval = uattr->read_timer_interval; | |
91 | attr->output = uattr->output; | |
92 | } | |
93 | ||
025faf73 DG |
94 | /* |
95 | * Match function for the hash table lookup. | |
96 | * | |
97 | * It matches an ust app event based on three attributes which are the event | |
98 | * name, the filter bytecode and the loglevel. | |
99 | */ | |
18eace3b DG |
100 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
101 | { | |
102 | struct ust_app_event *event; | |
103 | const struct ust_app_ht_key *key; | |
104 | ||
105 | assert(node); | |
106 | assert(_key); | |
107 | ||
108 | event = caa_container_of(node, struct ust_app_event, node.node); | |
109 | key = _key; | |
110 | ||
1af53eb5 | 111 | /* Match the 4 elements of the key: name, filter, loglevel, exclusions */ |
18eace3b DG |
112 | |
113 | /* Event name */ | |
114 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
115 | goto no_match; | |
116 | } | |
117 | ||
118 | /* Event loglevel. */ | |
119 | if (event->attr.loglevel != key->loglevel) { | |
025faf73 DG |
120 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
121 | && key->loglevel == 0 && event->attr.loglevel == -1) { | |
122 | /* | |
123 | * Match is accepted. This is because on event creation, the | |
124 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
125 | * -1 are accepted for this loglevel type since 0 is the one set by | |
126 | * the API when receiving an enable event. | |
127 | */ | |
128 | } else { | |
129 | goto no_match; | |
130 | } | |
18eace3b DG |
131 | } |
132 | ||
133 | /* One of the filters is NULL, fail. */ | |
134 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
135 | goto no_match; | |
136 | } | |
137 | ||
025faf73 DG |
138 | if (key->filter && event->filter) { |
139 | /* Both filters exists, check length followed by the bytecode. */ | |
140 | if (event->filter->len != key->filter->len || | |
141 | memcmp(event->filter->data, key->filter->data, | |
142 | event->filter->len) != 0) { | |
143 | goto no_match; | |
144 | } | |
18eace3b DG |
145 | } |
146 | ||
1af53eb5 JI |
147 | /* One of the exclusions is NULL, fail. */ |
148 | if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) { | |
149 | goto no_match; | |
150 | } | |
151 | ||
152 | if (key->exclusion && event->exclusion) { | |
153 | /* Both exclusions exists, check count followed by the names. */ | |
154 | if (event->exclusion->count != key->exclusion->count || | |
155 | memcmp(event->exclusion->names, key->exclusion->names, | |
156 | event->exclusion->count * LTTNG_UST_SYM_NAME_LEN) != 0) { | |
157 | goto no_match; | |
158 | } | |
159 | } | |
160 | ||
161 | ||
025faf73 | 162 | /* Match. */ |
18eace3b DG |
163 | return 1; |
164 | ||
165 | no_match: | |
166 | return 0; | |
18eace3b DG |
167 | } |
168 | ||
025faf73 DG |
169 | /* |
170 | * Unique add of an ust app event in the given ht. This uses the custom | |
171 | * ht_match_ust_app_event match function and the event name as hash. | |
172 | */ | |
d0b96690 | 173 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
174 | struct ust_app_event *event) |
175 | { | |
176 | struct cds_lfht_node *node_ptr; | |
177 | struct ust_app_ht_key key; | |
d0b96690 | 178 | struct lttng_ht *ht; |
18eace3b | 179 | |
d0b96690 DG |
180 | assert(ua_chan); |
181 | assert(ua_chan->events); | |
18eace3b DG |
182 | assert(event); |
183 | ||
d0b96690 | 184 | ht = ua_chan->events; |
18eace3b DG |
185 | key.name = event->attr.name; |
186 | key.filter = event->filter; | |
187 | key.loglevel = event->attr.loglevel; | |
91c89f23 | 188 | key.exclusion = event->exclusion; |
18eace3b DG |
189 | |
190 | node_ptr = cds_lfht_add_unique(ht->ht, | |
191 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
192 | ht_match_ust_app_event, &key, &event->node.node); | |
193 | assert(node_ptr == &event->node.node); | |
194 | } | |
195 | ||
d88aee68 DG |
196 | /* |
197 | * Close the notify socket from the given RCU head object. This MUST be called | |
198 | * through a call_rcu(). | |
199 | */ | |
200 | static void close_notify_sock_rcu(struct rcu_head *head) | |
201 | { | |
202 | int ret; | |
203 | struct ust_app_notify_sock_obj *obj = | |
204 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
205 | ||
206 | /* Must have a valid fd here. */ | |
207 | assert(obj->fd >= 0); | |
208 | ||
209 | ret = close(obj->fd); | |
210 | if (ret) { | |
211 | ERR("close notify sock %d RCU", obj->fd); | |
212 | } | |
213 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
214 | ||
215 | free(obj); | |
216 | } | |
217 | ||
7972aab2 DG |
218 | /* |
219 | * Return the session registry according to the buffer type of the given | |
220 | * session. | |
221 | * | |
222 | * A registry per UID object MUST exists before calling this function or else | |
223 | * it assert() if not found. RCU read side lock must be acquired. | |
224 | */ | |
225 | static struct ust_registry_session *get_session_registry( | |
226 | struct ust_app_session *ua_sess) | |
227 | { | |
228 | struct ust_registry_session *registry = NULL; | |
229 | ||
230 | assert(ua_sess); | |
231 | ||
232 | switch (ua_sess->buffer_type) { | |
233 | case LTTNG_BUFFER_PER_PID: | |
234 | { | |
235 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
236 | if (!reg_pid) { | |
237 | goto error; | |
238 | } | |
239 | registry = reg_pid->registry->reg.ust; | |
240 | break; | |
241 | } | |
242 | case LTTNG_BUFFER_PER_UID: | |
243 | { | |
244 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
245 | ua_sess->tracing_id, ua_sess->bits_per_long, ua_sess->uid); | |
246 | if (!reg_uid) { | |
247 | goto error; | |
248 | } | |
249 | registry = reg_uid->registry->reg.ust; | |
250 | break; | |
251 | } | |
252 | default: | |
253 | assert(0); | |
254 | }; | |
255 | ||
256 | error: | |
257 | return registry; | |
258 | } | |
259 | ||
55cc08a6 DG |
260 | /* |
261 | * Delete ust context safely. RCU read lock must be held before calling | |
262 | * this function. | |
263 | */ | |
264 | static | |
265 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx) | |
266 | { | |
ffe60014 DG |
267 | int ret; |
268 | ||
269 | assert(ua_ctx); | |
270 | ||
55cc08a6 | 271 | if (ua_ctx->obj) { |
ffe60014 | 272 | ret = ustctl_release_object(sock, ua_ctx->obj); |
d0b96690 DG |
273 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
274 | ERR("UST app sock %d release ctx obj handle %d failed with ret %d", | |
275 | sock, ua_ctx->obj->handle, ret); | |
ffe60014 | 276 | } |
55cc08a6 DG |
277 | free(ua_ctx->obj); |
278 | } | |
279 | free(ua_ctx); | |
280 | } | |
281 | ||
d80a6244 DG |
282 | /* |
283 | * Delete ust app event safely. RCU read lock must be held before calling | |
284 | * this function. | |
285 | */ | |
8b366481 DG |
286 | static |
287 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event) | |
d80a6244 | 288 | { |
ffe60014 DG |
289 | int ret; |
290 | ||
291 | assert(ua_event); | |
292 | ||
53a80697 | 293 | free(ua_event->filter); |
951f0b71 JI |
294 | if (ua_event->exclusion != NULL) |
295 | free(ua_event->exclusion); | |
edb67388 | 296 | if (ua_event->obj != NULL) { |
ffe60014 DG |
297 | ret = ustctl_release_object(sock, ua_event->obj); |
298 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
299 | ERR("UST app sock %d release event obj failed with ret %d", | |
300 | sock, ret); | |
301 | } | |
edb67388 DG |
302 | free(ua_event->obj); |
303 | } | |
d80a6244 DG |
304 | free(ua_event); |
305 | } | |
306 | ||
307 | /* | |
7972aab2 DG |
308 | * Release ust data object of the given stream. |
309 | * | |
310 | * Return 0 on success or else a negative value. | |
d80a6244 | 311 | */ |
7972aab2 | 312 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream) |
d80a6244 | 313 | { |
7972aab2 | 314 | int ret = 0; |
ffe60014 DG |
315 | |
316 | assert(stream); | |
317 | ||
8b366481 | 318 | if (stream->obj) { |
ffe60014 DG |
319 | ret = ustctl_release_object(sock, stream->obj); |
320 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
321 | ERR("UST app sock %d release stream obj failed with ret %d", | |
322 | sock, ret); | |
323 | } | |
4063050c | 324 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
325 | free(stream->obj); |
326 | } | |
7972aab2 DG |
327 | |
328 | return ret; | |
329 | } | |
330 | ||
331 | /* | |
332 | * Delete ust app stream safely. RCU read lock must be held before calling | |
333 | * this function. | |
334 | */ | |
335 | static | |
336 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream) | |
337 | { | |
338 | assert(stream); | |
339 | ||
340 | (void) release_ust_app_stream(sock, stream); | |
84cd17c6 | 341 | free(stream); |
d80a6244 DG |
342 | } |
343 | ||
36b588ed MD |
344 | /* |
345 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
346 | * section and outside of call_rcu thread, so we postpone its execution |
347 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
348 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
349 | */ |
350 | static | |
351 | void delete_ust_app_channel_rcu(struct rcu_head *head) | |
352 | { | |
353 | struct ust_app_channel *ua_chan = | |
354 | caa_container_of(head, struct ust_app_channel, rcu_head); | |
355 | ||
0b2dc8df MD |
356 | ht_cleanup_push(ua_chan->ctx); |
357 | ht_cleanup_push(ua_chan->events); | |
36b588ed MD |
358 | free(ua_chan); |
359 | } | |
360 | ||
d80a6244 DG |
361 | /* |
362 | * Delete ust app channel safely. RCU read lock must be held before calling | |
363 | * this function. | |
364 | */ | |
8b366481 | 365 | static |
d0b96690 DG |
366 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
367 | struct ust_app *app) | |
d80a6244 DG |
368 | { |
369 | int ret; | |
bec39940 | 370 | struct lttng_ht_iter iter; |
d80a6244 | 371 | struct ust_app_event *ua_event; |
55cc08a6 | 372 | struct ust_app_ctx *ua_ctx; |
030a66fa | 373 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 374 | struct ust_registry_session *registry; |
d80a6244 | 375 | |
ffe60014 DG |
376 | assert(ua_chan); |
377 | ||
378 | DBG3("UST app deleting channel %s", ua_chan->name); | |
379 | ||
55cc08a6 | 380 | /* Wipe stream */ |
d80a6244 | 381 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 382 | cds_list_del(&stream->list); |
d80a6244 DG |
383 | delete_ust_app_stream(sock, stream); |
384 | } | |
385 | ||
55cc08a6 | 386 | /* Wipe context */ |
bec39940 | 387 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
31746f93 | 388 | cds_list_del(&ua_ctx->list); |
bec39940 | 389 | ret = lttng_ht_del(ua_chan->ctx, &iter); |
55cc08a6 DG |
390 | assert(!ret); |
391 | delete_ust_app_ctx(sock, ua_ctx); | |
392 | } | |
d80a6244 | 393 | |
55cc08a6 | 394 | /* Wipe events */ |
bec39940 DG |
395 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
396 | node.node) { | |
397 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 398 | assert(!ret); |
d80a6244 DG |
399 | delete_ust_app_event(sock, ua_event); |
400 | } | |
edb67388 | 401 | |
c8335706 MD |
402 | if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) { |
403 | /* Wipe and free registry from session registry. */ | |
404 | registry = get_session_registry(ua_chan->session); | |
405 | if (registry) { | |
406 | ust_registry_channel_del_free(registry, ua_chan->key); | |
407 | } | |
7972aab2 | 408 | } |
d0b96690 | 409 | |
edb67388 | 410 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
411 | /* Remove channel from application UST object descriptor. */ |
412 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
c6e62271 DG |
413 | ret = lttng_ht_del(app->ust_objd, &iter); |
414 | assert(!ret); | |
ffe60014 DG |
415 | ret = ustctl_release_object(sock, ua_chan->obj); |
416 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
417 | ERR("UST app sock %d release channel obj failed with ret %d", | |
418 | sock, ret); | |
419 | } | |
7972aab2 | 420 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
421 | free(ua_chan->obj); |
422 | } | |
36b588ed | 423 | call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); |
d80a6244 DG |
424 | } |
425 | ||
331744e3 | 426 | /* |
1b532a60 DG |
427 | * Push metadata to consumer socket. |
428 | * | |
dc2bbdae MD |
429 | * RCU read-side lock must be held to guarantee existance of socket. |
430 | * Must be called with the ust app session lock held. | |
431 | * Must be called with the registry lock held. | |
331744e3 JD |
432 | * |
433 | * On success, return the len of metadata pushed or else a negative value. | |
434 | */ | |
435 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
436 | struct consumer_socket *socket, int send_zero_data) | |
437 | { | |
438 | int ret; | |
439 | char *metadata_str = NULL; | |
440 | size_t len, offset; | |
441 | ssize_t ret_val; | |
442 | ||
443 | assert(registry); | |
444 | assert(socket); | |
1b532a60 | 445 | |
ce34fcd0 | 446 | /* |
dc2bbdae MD |
447 | * Means that no metadata was assigned to the session. This can |
448 | * happens if no start has been done previously. | |
ce34fcd0 MD |
449 | */ |
450 | if (!registry->metadata_key) { | |
ce34fcd0 MD |
451 | return 0; |
452 | } | |
453 | ||
1b532a60 | 454 | /* |
dc2bbdae MD |
455 | * On a push metadata error either the consumer is dead or the |
456 | * metadata channel has been destroyed because its endpoint | |
457 | * might have died (e.g: relayd). If so, the metadata closed | |
458 | * flag is set to 1 so we deny pushing metadata again which is | |
459 | * not valid anymore on the consumer side. | |
1b532a60 DG |
460 | */ |
461 | if (registry->metadata_closed) { | |
462 | return -EPIPE; | |
463 | } | |
331744e3 | 464 | |
331744e3 JD |
465 | offset = registry->metadata_len_sent; |
466 | len = registry->metadata_len - registry->metadata_len_sent; | |
467 | if (len == 0) { | |
468 | DBG3("No metadata to push for metadata key %" PRIu64, | |
469 | registry->metadata_key); | |
470 | ret_val = len; | |
471 | if (send_zero_data) { | |
472 | DBG("No metadata to push"); | |
473 | goto push_data; | |
474 | } | |
475 | goto end; | |
476 | } | |
477 | ||
478 | /* Allocate only what we have to send. */ | |
479 | metadata_str = zmalloc(len); | |
480 | if (!metadata_str) { | |
481 | PERROR("zmalloc ust app metadata string"); | |
482 | ret_val = -ENOMEM; | |
483 | goto error; | |
484 | } | |
485 | /* Copy what we haven't send out. */ | |
486 | memcpy(metadata_str, registry->metadata + offset, len); | |
487 | registry->metadata_len_sent += len; | |
488 | ||
489 | push_data: | |
331744e3 JD |
490 | ret = consumer_push_metadata(socket, registry->metadata_key, |
491 | metadata_str, len, offset); | |
492 | if (ret < 0) { | |
000baf6a | 493 | /* |
dc2bbdae MD |
494 | * There is an acceptable race here between the registry |
495 | * metadata key assignment and the creation on the | |
496 | * consumer. The session daemon can concurrently push | |
497 | * metadata for this registry while being created on the | |
498 | * consumer since the metadata key of the registry is | |
499 | * assigned *before* it is setup to avoid the consumer | |
500 | * to ask for metadata that could possibly be not found | |
501 | * in the session daemon. | |
000baf6a | 502 | * |
dc2bbdae MD |
503 | * The metadata will get pushed either by the session |
504 | * being stopped or the consumer requesting metadata if | |
505 | * that race is triggered. | |
000baf6a DG |
506 | */ |
507 | if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) { | |
508 | ret = 0; | |
509 | } | |
ffa3f245 | 510 | |
dc2bbdae MD |
511 | /* |
512 | * Update back the actual metadata len sent since it | |
513 | * failed here. | |
514 | */ | |
ffa3f245 | 515 | registry->metadata_len_sent -= len; |
331744e3 JD |
516 | ret_val = ret; |
517 | goto error_push; | |
518 | } | |
519 | ||
520 | free(metadata_str); | |
521 | return len; | |
522 | ||
523 | end: | |
524 | error: | |
ce34fcd0 MD |
525 | if (ret_val) { |
526 | /* | |
dc2bbdae MD |
527 | * On error, flag the registry that the metadata is |
528 | * closed. We were unable to push anything and this | |
529 | * means that either the consumer is not responding or | |
530 | * the metadata cache has been destroyed on the | |
531 | * consumer. | |
ce34fcd0 MD |
532 | */ |
533 | registry->metadata_closed = 1; | |
534 | } | |
331744e3 JD |
535 | error_push: |
536 | free(metadata_str); | |
537 | return ret_val; | |
538 | } | |
539 | ||
d88aee68 | 540 | /* |
ce34fcd0 | 541 | * For a given application and session, push metadata to consumer. |
331744e3 JD |
542 | * Either sock or consumer is required : if sock is NULL, the default |
543 | * socket to send the metadata is retrieved from consumer, if sock | |
544 | * is not NULL we use it to send the metadata. | |
ce34fcd0 | 545 | * RCU read-side lock must be held while calling this function, |
dc2bbdae MD |
546 | * therefore ensuring existance of registry. It also ensures existance |
547 | * of socket throughout this function. | |
d88aee68 DG |
548 | * |
549 | * Return 0 on success else a negative error. | |
550 | */ | |
7972aab2 DG |
551 | static int push_metadata(struct ust_registry_session *registry, |
552 | struct consumer_output *consumer) | |
d88aee68 | 553 | { |
331744e3 JD |
554 | int ret_val; |
555 | ssize_t ret; | |
d88aee68 DG |
556 | struct consumer_socket *socket; |
557 | ||
7972aab2 DG |
558 | assert(registry); |
559 | assert(consumer); | |
560 | ||
ce34fcd0 | 561 | pthread_mutex_lock(®istry->lock); |
ce34fcd0 | 562 | if (registry->metadata_closed) { |
dc2bbdae MD |
563 | ret_val = -EPIPE; |
564 | goto error; | |
d88aee68 DG |
565 | } |
566 | ||
d88aee68 | 567 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
568 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
569 | consumer); | |
d88aee68 | 570 | if (!socket) { |
331744e3 | 571 | ret_val = -1; |
ce34fcd0 | 572 | goto error; |
d88aee68 DG |
573 | } |
574 | ||
331744e3 | 575 | ret = ust_app_push_metadata(registry, socket, 0); |
d88aee68 | 576 | if (ret < 0) { |
331744e3 | 577 | ret_val = ret; |
ce34fcd0 | 578 | goto error; |
d88aee68 | 579 | } |
dc2bbdae | 580 | pthread_mutex_unlock(®istry->lock); |
d88aee68 DG |
581 | return 0; |
582 | ||
ce34fcd0 | 583 | error: |
dc2bbdae | 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 | |
dc2bbdae | 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 | ||
ce34fcd0 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: | |
ce34fcd0 | 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); |
ce34fcd0 | 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 | */ |
ce34fcd0 | 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 */ |
40113787 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 | } | |
8535a6d9 DG |
1474 | } |
1475 | ||
5b4a0ec0 | 1476 | error: |
840cb59c | 1477 | health_code_update(); |
5b4a0ec0 | 1478 | return ret; |
91d76f53 | 1479 | } |
48842b30 | 1480 | |
5b4a0ec0 DG |
1481 | /* |
1482 | * Copy data between an UST app event and a LTT event. | |
1483 | */ | |
421cb601 | 1484 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1485 | struct ltt_ust_event *uevent) |
1486 | { | |
b4ffad32 JI |
1487 | size_t exclusion_alloc_size; |
1488 | ||
48842b30 DG |
1489 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); |
1490 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1491 | ||
fc34caaa DG |
1492 | ua_event->enabled = uevent->enabled; |
1493 | ||
5b4a0ec0 DG |
1494 | /* Copy event attributes */ |
1495 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1496 | ||
53a80697 MD |
1497 | /* Copy filter bytecode */ |
1498 | if (uevent->filter) { | |
025faf73 DG |
1499 | ua_event->filter = alloc_copy_ust_app_filter(uevent->filter); |
1500 | /* Filter might be NULL here in case of ENONEM. */ | |
53a80697 | 1501 | } |
b4ffad32 JI |
1502 | |
1503 | /* Copy exclusion data */ | |
1504 | if (uevent->exclusion) { | |
1505 | exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) + | |
1506 | LTTNG_UST_SYM_NAME_LEN * uevent->exclusion->count; | |
1507 | ua_event->exclusion = zmalloc(exclusion_alloc_size); | |
5f8df26c JI |
1508 | if (ua_event->exclusion == NULL) { |
1509 | PERROR("malloc"); | |
1510 | } else { | |
1511 | memcpy(ua_event->exclusion, uevent->exclusion, | |
1512 | exclusion_alloc_size); | |
b4ffad32 JI |
1513 | } |
1514 | } | |
48842b30 DG |
1515 | } |
1516 | ||
5b4a0ec0 DG |
1517 | /* |
1518 | * Copy data between an UST app channel and a LTT channel. | |
1519 | */ | |
421cb601 | 1520 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1521 | struct ltt_ust_channel *uchan) |
1522 | { | |
bec39940 | 1523 | struct lttng_ht_iter iter; |
48842b30 | 1524 | struct ltt_ust_event *uevent; |
55cc08a6 | 1525 | struct ltt_ust_context *uctx; |
48842b30 | 1526 | struct ust_app_event *ua_event; |
55cc08a6 | 1527 | struct ust_app_ctx *ua_ctx; |
48842b30 | 1528 | |
fc34caaa | 1529 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1530 | |
1531 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1532 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 1533 | |
1624d5b7 JD |
1534 | ua_chan->tracefile_size = uchan->tracefile_size; |
1535 | ua_chan->tracefile_count = uchan->tracefile_count; | |
1536 | ||
ffe60014 DG |
1537 | /* Copy event attributes since the layout is different. */ |
1538 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1539 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1540 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1541 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1542 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
1543 | ua_chan->attr.output = uchan->attr.output; | |
1544 | /* | |
1545 | * Note that the attribute channel type is not set since the channel on the | |
1546 | * tracing registry side does not have this information. | |
1547 | */ | |
48842b30 | 1548 | |
fc34caaa | 1549 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1550 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1551 | |
31746f93 | 1552 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { |
55cc08a6 DG |
1553 | ua_ctx = alloc_ust_app_ctx(&uctx->ctx); |
1554 | if (ua_ctx == NULL) { | |
1555 | continue; | |
1556 | } | |
bec39940 DG |
1557 | lttng_ht_node_init_ulong(&ua_ctx->node, |
1558 | (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 1559 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 1560 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
55cc08a6 | 1561 | } |
48842b30 | 1562 | |
421cb601 | 1563 | /* Copy all events from ltt ust channel to ust app channel */ |
bec39940 | 1564 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
18eace3b | 1565 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 1566 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 1567 | if (ua_event == NULL) { |
421cb601 | 1568 | DBG2("UST event %s not found on shadow copy channel", |
48842b30 | 1569 | uevent->attr.name); |
284d8f55 | 1570 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
48842b30 | 1571 | if (ua_event == NULL) { |
5b4a0ec0 | 1572 | continue; |
48842b30 | 1573 | } |
421cb601 | 1574 | shadow_copy_event(ua_event, uevent); |
d0b96690 | 1575 | add_unique_ust_app_event(ua_chan, ua_event); |
48842b30 | 1576 | } |
48842b30 DG |
1577 | } |
1578 | ||
fc34caaa | 1579 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1580 | } |
1581 | ||
5b4a0ec0 DG |
1582 | /* |
1583 | * Copy data between a UST app session and a regular LTT session. | |
1584 | */ | |
421cb601 | 1585 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1586 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1587 | { |
bec39940 DG |
1588 | struct lttng_ht_node_str *ua_chan_node; |
1589 | struct lttng_ht_iter iter; | |
48842b30 DG |
1590 | struct ltt_ust_channel *uchan; |
1591 | struct ust_app_channel *ua_chan; | |
477d7741 MD |
1592 | time_t rawtime; |
1593 | struct tm *timeinfo; | |
1594 | char datetime[16]; | |
1595 | int ret; | |
d7ba1388 | 1596 | char tmp_shm_path[PATH_MAX]; |
477d7741 MD |
1597 | |
1598 | /* Get date and time for unique app path */ | |
1599 | time(&rawtime); | |
1600 | timeinfo = localtime(&rawtime); | |
1601 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1602 | |
421cb601 | 1603 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1604 | |
7972aab2 DG |
1605 | ua_sess->tracing_id = usess->id; |
1606 | ua_sess->id = get_next_session_id(); | |
1607 | ua_sess->uid = app->uid; | |
1608 | ua_sess->gid = app->gid; | |
1609 | ua_sess->euid = usess->uid; | |
1610 | ua_sess->egid = usess->gid; | |
1611 | ua_sess->buffer_type = usess->buffer_type; | |
1612 | ua_sess->bits_per_long = app->bits_per_long; | |
1613 | /* There is only one consumer object per session possible. */ | |
1614 | ua_sess->consumer = usess->consumer; | |
2bba9e53 | 1615 | ua_sess->output_traces = usess->output_traces; |
ecc48a90 | 1616 | ua_sess->live_timer_interval = usess->live_timer_interval; |
84ad93e8 DG |
1617 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, |
1618 | &usess->metadata_attr); | |
7972aab2 DG |
1619 | |
1620 | switch (ua_sess->buffer_type) { | |
1621 | case LTTNG_BUFFER_PER_PID: | |
1622 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 1623 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
1624 | datetime); |
1625 | break; | |
1626 | case LTTNG_BUFFER_PER_UID: | |
1627 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1628 | DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long); | |
1629 | break; | |
1630 | default: | |
1631 | assert(0); | |
1632 | goto error; | |
1633 | } | |
477d7741 MD |
1634 | if (ret < 0) { |
1635 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1636 | assert(0); |
7972aab2 | 1637 | goto error; |
477d7741 MD |
1638 | } |
1639 | ||
d7ba1388 MD |
1640 | strncpy(ua_sess->shm_path, usess->shm_path, |
1641 | sizeof(ua_sess->shm_path)); | |
1642 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
1643 | if (ua_sess->shm_path[0]) { | |
1644 | switch (ua_sess->buffer_type) { | |
1645 | case LTTNG_BUFFER_PER_PID: | |
1646 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
1647 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", | |
1648 | app->name, app->pid, datetime); | |
1649 | break; | |
1650 | case LTTNG_BUFFER_PER_UID: | |
1651 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
1652 | DEFAULT_UST_TRACE_UID_PATH, | |
1653 | app->uid, app->bits_per_long); | |
1654 | break; | |
1655 | default: | |
1656 | assert(0); | |
1657 | goto error; | |
1658 | } | |
1659 | if (ret < 0) { | |
1660 | PERROR("sprintf UST shadow copy session"); | |
1661 | assert(0); | |
1662 | goto error; | |
1663 | } | |
1664 | strncat(ua_sess->shm_path, tmp_shm_path, | |
1665 | sizeof(ua_sess->shm_path) - strlen(ua_sess->shm_path) - 1); | |
1666 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
1667 | } | |
1668 | ||
48842b30 | 1669 | /* Iterate over all channels in global domain. */ |
bec39940 DG |
1670 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, |
1671 | uchan, node.node) { | |
1672 | struct lttng_ht_iter uiter; | |
ba767faf | 1673 | |
bec39940 DG |
1674 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
1675 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
5b4a0ec0 | 1676 | if (ua_chan_node != NULL) { |
fc34caaa | 1677 | /* Session exist. Contiuing. */ |
5b4a0ec0 DG |
1678 | continue; |
1679 | } | |
421cb601 | 1680 | |
5b4a0ec0 DG |
1681 | DBG2("Channel %s not found on shadow session copy, creating it", |
1682 | uchan->name); | |
d0b96690 | 1683 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
5b4a0ec0 | 1684 | if (ua_chan == NULL) { |
fc34caaa | 1685 | /* malloc failed FIXME: Might want to do handle ENOMEM .. */ |
5b4a0ec0 | 1686 | continue; |
48842b30 | 1687 | } |
5b4a0ec0 | 1688 | shadow_copy_channel(ua_chan, uchan); |
ffe60014 DG |
1689 | /* |
1690 | * The concept of metadata channel does not exist on the tracing | |
1691 | * registry side of the session daemon so this can only be a per CPU | |
1692 | * channel and not metadata. | |
1693 | */ | |
1694 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
1695 | ||
bec39940 | 1696 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); |
48842b30 | 1697 | } |
7972aab2 DG |
1698 | |
1699 | error: | |
1700 | return; | |
48842b30 DG |
1701 | } |
1702 | ||
78f0bacd DG |
1703 | /* |
1704 | * Lookup sesison wrapper. | |
1705 | */ | |
84cd17c6 MD |
1706 | static |
1707 | void __lookup_session_by_app(struct ltt_ust_session *usess, | |
bec39940 | 1708 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1709 | { |
1710 | /* Get right UST app session from app */ | |
d9bf3ca4 | 1711 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
1712 | } |
1713 | ||
421cb601 DG |
1714 | /* |
1715 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1716 | * id. |
421cb601 | 1717 | */ |
48842b30 DG |
1718 | static struct ust_app_session *lookup_session_by_app( |
1719 | struct ltt_ust_session *usess, struct ust_app *app) | |
1720 | { | |
bec39940 | 1721 | struct lttng_ht_iter iter; |
d9bf3ca4 | 1722 | struct lttng_ht_node_u64 *node; |
48842b30 | 1723 | |
84cd17c6 | 1724 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 1725 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
1726 | if (node == NULL) { |
1727 | goto error; | |
1728 | } | |
1729 | ||
1730 | return caa_container_of(node, struct ust_app_session, node); | |
1731 | ||
1732 | error: | |
1733 | return NULL; | |
1734 | } | |
1735 | ||
7972aab2 DG |
1736 | /* |
1737 | * Setup buffer registry per PID for the given session and application. If none | |
1738 | * is found, a new one is created, added to the global registry and | |
1739 | * initialized. If regp is valid, it's set with the newly created object. | |
1740 | * | |
1741 | * Return 0 on success or else a negative value. | |
1742 | */ | |
1743 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
1744 | struct ust_app *app, struct buffer_reg_pid **regp) | |
1745 | { | |
1746 | int ret = 0; | |
1747 | struct buffer_reg_pid *reg_pid; | |
1748 | ||
1749 | assert(ua_sess); | |
1750 | assert(app); | |
1751 | ||
1752 | rcu_read_lock(); | |
1753 | ||
1754 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
1755 | if (!reg_pid) { | |
1756 | /* | |
1757 | * This is the create channel path meaning that if there is NO | |
1758 | * registry available, we have to create one for this session. | |
1759 | */ | |
d7ba1388 MD |
1760 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid, |
1761 | ua_sess->shm_path); | |
7972aab2 DG |
1762 | if (ret < 0) { |
1763 | goto error; | |
1764 | } | |
7972aab2 DG |
1765 | } else { |
1766 | goto end; | |
1767 | } | |
1768 | ||
1769 | /* Initialize registry. */ | |
1770 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
1771 | app->bits_per_long, app->uint8_t_alignment, | |
1772 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1773 | app->uint64_t_alignment, app->long_alignment, |
1774 | app->byte_order, app->version.major, | |
d7ba1388 MD |
1775 | app->version.minor, reg_pid->shm_path, |
1776 | ua_sess->euid, ua_sess->egid); | |
7972aab2 | 1777 | if (ret < 0) { |
286c991a MD |
1778 | /* |
1779 | * reg_pid->registry->reg.ust is NULL upon error, so we need to | |
1780 | * destroy the buffer registry, because it is always expected | |
1781 | * that if the buffer registry can be found, its ust registry is | |
1782 | * non-NULL. | |
1783 | */ | |
1784 | buffer_reg_pid_destroy(reg_pid); | |
7972aab2 DG |
1785 | goto error; |
1786 | } | |
1787 | ||
286c991a MD |
1788 | buffer_reg_pid_add(reg_pid); |
1789 | ||
7972aab2 DG |
1790 | DBG3("UST app buffer registry per PID created successfully"); |
1791 | ||
1792 | end: | |
1793 | if (regp) { | |
1794 | *regp = reg_pid; | |
1795 | } | |
1796 | error: | |
1797 | rcu_read_unlock(); | |
1798 | return ret; | |
1799 | } | |
1800 | ||
1801 | /* | |
1802 | * Setup buffer registry per UID for the given session and application. If none | |
1803 | * is found, a new one is created, added to the global registry and | |
1804 | * initialized. If regp is valid, it's set with the newly created object. | |
1805 | * | |
1806 | * Return 0 on success or else a negative value. | |
1807 | */ | |
1808 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
d7ba1388 | 1809 | struct ust_app_session *ua_sess, |
7972aab2 DG |
1810 | struct ust_app *app, struct buffer_reg_uid **regp) |
1811 | { | |
1812 | int ret = 0; | |
1813 | struct buffer_reg_uid *reg_uid; | |
1814 | ||
1815 | assert(usess); | |
1816 | assert(app); | |
1817 | ||
1818 | rcu_read_lock(); | |
1819 | ||
1820 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
1821 | if (!reg_uid) { | |
1822 | /* | |
1823 | * This is the create channel path meaning that if there is NO | |
1824 | * registry available, we have to create one for this session. | |
1825 | */ | |
1826 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
d7ba1388 | 1827 | LTTNG_DOMAIN_UST, ®_uid, ua_sess->shm_path); |
7972aab2 DG |
1828 | if (ret < 0) { |
1829 | goto error; | |
1830 | } | |
7972aab2 DG |
1831 | } else { |
1832 | goto end; | |
1833 | } | |
1834 | ||
1835 | /* Initialize registry. */ | |
af6142cf | 1836 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
1837 | app->bits_per_long, app->uint8_t_alignment, |
1838 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1839 | app->uint64_t_alignment, app->long_alignment, |
1840 | app->byte_order, app->version.major, | |
d7ba1388 MD |
1841 | app->version.minor, reg_uid->shm_path, |
1842 | usess->uid, usess->gid); | |
7972aab2 | 1843 | if (ret < 0) { |
286c991a MD |
1844 | /* |
1845 | * reg_uid->registry->reg.ust is NULL upon error, so we need to | |
1846 | * destroy the buffer registry, because it is always expected | |
1847 | * that if the buffer registry can be found, its ust registry is | |
1848 | * non-NULL. | |
1849 | */ | |
1850 | buffer_reg_uid_destroy(reg_uid, NULL); | |
7972aab2 DG |
1851 | goto error; |
1852 | } | |
1853 | /* Add node to teardown list of the session. */ | |
1854 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
1855 | ||
286c991a | 1856 | buffer_reg_uid_add(reg_uid); |
7972aab2 | 1857 | |
286c991a | 1858 | DBG3("UST app buffer registry per UID created successfully"); |
7972aab2 DG |
1859 | end: |
1860 | if (regp) { | |
1861 | *regp = reg_uid; | |
1862 | } | |
1863 | error: | |
1864 | rcu_read_unlock(); | |
1865 | return ret; | |
1866 | } | |
1867 | ||
421cb601 | 1868 | /* |
3d8ca23b | 1869 | * Create a session on the tracer side for the given app. |
421cb601 | 1870 | * |
3d8ca23b DG |
1871 | * On success, ua_sess_ptr is populated with the session pointer or else left |
1872 | * untouched. If the session was created, is_created is set to 1. On error, | |
1873 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
1874 | * be NULL. | |
1875 | * | |
1876 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
1877 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 1878 | */ |
3d8ca23b DG |
1879 | static int create_ust_app_session(struct ltt_ust_session *usess, |
1880 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, | |
1881 | int *is_created) | |
421cb601 | 1882 | { |
3d8ca23b | 1883 | int ret, created = 0; |
421cb601 DG |
1884 | struct ust_app_session *ua_sess; |
1885 | ||
3d8ca23b DG |
1886 | assert(usess); |
1887 | assert(app); | |
1888 | assert(ua_sess_ptr); | |
1889 | ||
840cb59c | 1890 | health_code_update(); |
86acf0da | 1891 | |
421cb601 DG |
1892 | ua_sess = lookup_session_by_app(usess, app); |
1893 | if (ua_sess == NULL) { | |
d9bf3ca4 | 1894 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 1895 | app->pid, usess->id); |
d0b96690 | 1896 | ua_sess = alloc_ust_app_session(app); |
421cb601 DG |
1897 | if (ua_sess == NULL) { |
1898 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
1899 | ret = -ENOMEM; |
1900 | goto error; | |
421cb601 | 1901 | } |
477d7741 | 1902 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 1903 | created = 1; |
421cb601 DG |
1904 | } |
1905 | ||
7972aab2 DG |
1906 | switch (usess->buffer_type) { |
1907 | case LTTNG_BUFFER_PER_PID: | |
1908 | /* Init local registry. */ | |
1909 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 1910 | if (ret < 0) { |
e64207cf | 1911 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
1912 | goto error; |
1913 | } | |
1914 | break; | |
1915 | case LTTNG_BUFFER_PER_UID: | |
1916 | /* Look for a global registry. If none exists, create one. */ | |
d7ba1388 | 1917 | ret = setup_buffer_reg_uid(usess, ua_sess, app, NULL); |
7972aab2 | 1918 | if (ret < 0) { |
e64207cf | 1919 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
1920 | goto error; |
1921 | } | |
1922 | break; | |
1923 | default: | |
1924 | assert(0); | |
1925 | ret = -EINVAL; | |
1926 | goto error; | |
1927 | } | |
1928 | ||
1929 | health_code_update(); | |
1930 | ||
1931 | if (ua_sess->handle == -1) { | |
1932 | ret = ustctl_create_session(app->sock); | |
1933 | if (ret < 0) { | |
1934 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1935 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
1936 | app->pid, ret); |
1937 | } else { | |
1938 | DBG("UST app creating session failed. Application is dead"); | |
3757b385 DG |
1939 | /* |
1940 | * This is normal behavior, an application can die during the | |
1941 | * creation process. Don't report an error so the execution can | |
1942 | * continue normally. This will get flagged ENOTCONN and the | |
1943 | * caller will handle it. | |
1944 | */ | |
1945 | ret = 0; | |
ffe60014 | 1946 | } |
d0b96690 | 1947 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
1948 | if (ret != -ENOMEM) { |
1949 | /* | |
1950 | * Tracer is probably gone or got an internal error so let's | |
1951 | * behave like it will soon unregister or not usable. | |
1952 | */ | |
1953 | ret = -ENOTCONN; | |
1954 | } | |
1955 | goto error; | |
421cb601 DG |
1956 | } |
1957 | ||
7972aab2 DG |
1958 | ua_sess->handle = ret; |
1959 | ||
1960 | /* Add ust app session to app's HT */ | |
d9bf3ca4 MD |
1961 | lttng_ht_node_init_u64(&ua_sess->node, |
1962 | ua_sess->tracing_id); | |
1963 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
7972aab2 DG |
1964 | |
1965 | DBG2("UST app session created successfully with handle %d", ret); | |
1966 | } | |
1967 | ||
1968 | *ua_sess_ptr = ua_sess; | |
1969 | if (is_created) { | |
1970 | *is_created = created; | |
1971 | } | |
1972 | ||
1973 | /* Everything went well. */ | |
1974 | ret = 0; | |
1975 | ||
1976 | error: | |
1977 | health_code_update(); | |
1978 | return ret; | |
1979 | } | |
1980 | ||
6a6b2068 JG |
1981 | /* |
1982 | * Match function for a hash table lookup of ust_app_ctx. | |
1983 | * | |
1984 | * It matches an ust app context based on the context type and, in the case | |
1985 | * of perf counters, their name. | |
1986 | */ | |
1987 | static int ht_match_ust_app_ctx(struct cds_lfht_node *node, const void *_key) | |
1988 | { | |
1989 | struct ust_app_ctx *ctx; | |
1990 | const struct lttng_ust_context *key; | |
1991 | ||
1992 | assert(node); | |
1993 | assert(_key); | |
1994 | ||
1995 | ctx = caa_container_of(node, struct ust_app_ctx, node.node); | |
1996 | key = _key; | |
1997 | ||
1998 | /* Context type */ | |
1999 | if (ctx->ctx.ctx != key->ctx) { | |
2000 | goto no_match; | |
2001 | } | |
2002 | ||
2003 | /* Check the name in the case of perf thread counters. */ | |
2004 | if (key->ctx == LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER) { | |
2005 | if (strncmp(key->u.perf_counter.name, | |
2006 | ctx->ctx.u.perf_counter.name, | |
2007 | sizeof(key->u.perf_counter.name))) { | |
2008 | goto no_match; | |
2009 | } | |
2010 | } | |
2011 | ||
2012 | /* Match. */ | |
2013 | return 1; | |
2014 | ||
2015 | no_match: | |
2016 | return 0; | |
2017 | } | |
2018 | ||
2019 | /* | |
2020 | * Lookup for an ust app context from an lttng_ust_context. | |
2021 | * | |
be184a0f | 2022 | * Must be called while holding RCU read side lock. |
6a6b2068 JG |
2023 | * Return an ust_app_ctx object or NULL on error. |
2024 | */ | |
2025 | static | |
2026 | struct ust_app_ctx *find_ust_app_context(struct lttng_ht *ht, | |
2027 | struct lttng_ust_context *uctx) | |
2028 | { | |
2029 | struct lttng_ht_iter iter; | |
2030 | struct lttng_ht_node_ulong *node; | |
2031 | struct ust_app_ctx *app_ctx = NULL; | |
2032 | ||
2033 | assert(uctx); | |
2034 | assert(ht); | |
2035 | ||
2036 | /* Lookup using the lttng_ust_context_type and a custom match fct. */ | |
2037 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) uctx->ctx, lttng_ht_seed), | |
2038 | ht_match_ust_app_ctx, uctx, &iter.iter); | |
2039 | node = lttng_ht_iter_get_node_ulong(&iter); | |
2040 | if (!node) { | |
2041 | goto end; | |
2042 | } | |
2043 | ||
2044 | app_ctx = caa_container_of(node, struct ust_app_ctx, node); | |
2045 | ||
2046 | end: | |
2047 | return app_ctx; | |
2048 | } | |
2049 | ||
7972aab2 DG |
2050 | /* |
2051 | * Create a context for the channel on the tracer. | |
2052 | * | |
2053 | * Called with UST app session lock held and a RCU read side lock. | |
2054 | */ | |
2055 | static | |
2056 | int create_ust_app_channel_context(struct ust_app_session *ua_sess, | |
2057 | struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx, | |
2058 | struct ust_app *app) | |
2059 | { | |
2060 | int ret = 0; | |
7972aab2 DG |
2061 | struct ust_app_ctx *ua_ctx; |
2062 | ||
2063 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
2064 | ||
6a6b2068 JG |
2065 | ua_ctx = find_ust_app_context(ua_chan->ctx, uctx); |
2066 | if (ua_ctx) { | |
7972aab2 DG |
2067 | ret = -EEXIST; |
2068 | goto error; | |
2069 | } | |
2070 | ||
2071 | ua_ctx = alloc_ust_app_ctx(uctx); | |
2072 | if (ua_ctx == NULL) { | |
2073 | /* malloc failed */ | |
2074 | ret = -1; | |
2075 | goto error; | |
2076 | } | |
2077 | ||
2078 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 2079 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 2080 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
2081 | |
2082 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
2083 | if (ret < 0) { | |
2084 | goto error; | |
2085 | } | |
2086 | ||
2087 | error: | |
2088 | return ret; | |
2089 | } | |
2090 | ||
2091 | /* | |
2092 | * Enable on the tracer side a ust app event for the session and channel. | |
2093 | * | |
2094 | * Called with UST app session lock held. | |
2095 | */ | |
2096 | static | |
2097 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
2098 | struct ust_app_event *ua_event, struct ust_app *app) | |
2099 | { | |
2100 | int ret; | |
2101 | ||
2102 | ret = enable_ust_event(app, ua_sess, ua_event); | |
2103 | if (ret < 0) { | |
2104 | goto error; | |
2105 | } | |
2106 | ||
2107 | ua_event->enabled = 1; | |
2108 | ||
2109 | error: | |
2110 | return ret; | |
2111 | } | |
2112 | ||
2113 | /* | |
2114 | * Disable on the tracer side a ust app event for the session and channel. | |
2115 | */ | |
2116 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
2117 | struct ust_app_event *ua_event, struct ust_app *app) | |
2118 | { | |
2119 | int ret; | |
2120 | ||
2121 | ret = disable_ust_event(app, ua_sess, ua_event); | |
2122 | if (ret < 0) { | |
2123 | goto error; | |
2124 | } | |
2125 | ||
2126 | ua_event->enabled = 0; | |
2127 | ||
2128 | error: | |
2129 | return ret; | |
2130 | } | |
2131 | ||
2132 | /* | |
2133 | * Lookup ust app channel for session and disable it on the tracer side. | |
2134 | */ | |
2135 | static | |
2136 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
2137 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
2138 | { | |
2139 | int ret; | |
2140 | ||
2141 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2142 | if (ret < 0) { | |
2143 | goto error; | |
2144 | } | |
2145 | ||
2146 | ua_chan->enabled = 0; | |
2147 | ||
2148 | error: | |
2149 | return ret; | |
2150 | } | |
2151 | ||
2152 | /* | |
2153 | * Lookup ust app channel for session and enable it on the tracer side. This | |
2154 | * MUST be called with a RCU read side lock acquired. | |
2155 | */ | |
2156 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
2157 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
2158 | { | |
2159 | int ret = 0; | |
2160 | struct lttng_ht_iter iter; | |
2161 | struct lttng_ht_node_str *ua_chan_node; | |
2162 | struct ust_app_channel *ua_chan; | |
2163 | ||
2164 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
2165 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
2166 | if (ua_chan_node == NULL) { | |
d9bf3ca4 | 2167 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
2168 | uchan->name, ua_sess->tracing_id); |
2169 | goto error; | |
2170 | } | |
2171 | ||
2172 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2173 | ||
2174 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
2175 | if (ret < 0) { | |
2176 | goto error; | |
2177 | } | |
2178 | ||
2179 | error: | |
2180 | return ret; | |
2181 | } | |
2182 | ||
2183 | /* | |
2184 | * Ask the consumer to create a channel and get it if successful. | |
2185 | * | |
2186 | * Return 0 on success or else a negative value. | |
2187 | */ | |
2188 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
2189 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
2190 | int bitness, struct ust_registry_session *registry) | |
2191 | { | |
2192 | int ret; | |
2193 | unsigned int nb_fd = 0; | |
2194 | struct consumer_socket *socket; | |
2195 | ||
2196 | assert(usess); | |
2197 | assert(ua_sess); | |
2198 | assert(ua_chan); | |
2199 | assert(registry); | |
2200 | ||
2201 | rcu_read_lock(); | |
2202 | health_code_update(); | |
2203 | ||
2204 | /* Get the right consumer socket for the application. */ | |
2205 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
2206 | if (!socket) { | |
2207 | ret = -EINVAL; | |
2208 | goto error; | |
2209 | } | |
2210 | ||
2211 | health_code_update(); | |
2212 | ||
2213 | /* Need one fd for the channel. */ | |
2214 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2215 | if (ret < 0) { | |
2216 | ERR("Exhausted number of available FD upon create channel"); | |
2217 | goto error; | |
2218 | } | |
2219 | ||
2220 | /* | |
2221 | * Ask consumer to create channel. The consumer will return the number of | |
2222 | * stream we have to expect. | |
2223 | */ | |
2224 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
2225 | registry); | |
2226 | if (ret < 0) { | |
2227 | goto error_ask; | |
2228 | } | |
2229 | ||
2230 | /* | |
2231 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2232 | * stream (2 being the default value here). | |
2233 | */ | |
2234 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2235 | ||
2236 | /* Reserve the amount of file descriptor we need. */ | |
2237 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2238 | if (ret < 0) { | |
2239 | ERR("Exhausted number of available FD upon create channel"); | |
2240 | goto error_fd_get_stream; | |
2241 | } | |
2242 | ||
2243 | health_code_update(); | |
2244 | ||
2245 | /* | |
2246 | * Now get the channel from the consumer. This call wil populate the stream | |
2247 | * list of that channel and set the ust objects. | |
2248 | */ | |
d9078d0c DG |
2249 | if (usess->consumer->enabled) { |
2250 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2251 | if (ret < 0) { | |
2252 | goto error_destroy; | |
2253 | } | |
7972aab2 DG |
2254 | } |
2255 | ||
2256 | rcu_read_unlock(); | |
2257 | return 0; | |
2258 | ||
2259 | error_destroy: | |
2260 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2261 | error_fd_get_stream: | |
2262 | /* | |
2263 | * Initiate a destroy channel on the consumer since we had an error | |
2264 | * handling it on our side. The return value is of no importance since we | |
2265 | * already have a ret value set by the previous error that we need to | |
2266 | * return. | |
2267 | */ | |
2268 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2269 | error_ask: | |
2270 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2271 | error: | |
2272 | health_code_update(); | |
2273 | rcu_read_unlock(); | |
2274 | return ret; | |
2275 | } | |
2276 | ||
2277 | /* | |
2278 | * Duplicate the ust data object of the ust app stream and save it in the | |
2279 | * buffer registry stream. | |
2280 | * | |
2281 | * Return 0 on success or else a negative value. | |
2282 | */ | |
2283 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2284 | struct ust_app_stream *stream) | |
2285 | { | |
2286 | int ret; | |
2287 | ||
2288 | assert(reg_stream); | |
2289 | assert(stream); | |
2290 | ||
2291 | /* Reserve the amount of file descriptor we need. */ | |
2292 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2293 | if (ret < 0) { | |
2294 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2295 | goto error; | |
2296 | } | |
2297 | ||
2298 | /* Duplicate object for stream once the original is in the registry. */ | |
2299 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2300 | reg_stream->obj.ust); | |
2301 | if (ret < 0) { | |
2302 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2303 | reg_stream->obj.ust, stream->obj, ret); | |
2304 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2305 | goto error; | |
2306 | } | |
2307 | stream->handle = stream->obj->handle; | |
2308 | ||
2309 | error: | |
2310 | return ret; | |
2311 | } | |
2312 | ||
2313 | /* | |
2314 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2315 | * buffer registry channel. | |
2316 | * | |
2317 | * Return 0 on success or else a negative value. | |
2318 | */ | |
2319 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2320 | struct ust_app_channel *ua_chan) | |
2321 | { | |
2322 | int ret; | |
2323 | ||
2324 | assert(reg_chan); | |
2325 | assert(ua_chan); | |
2326 | ||
2327 | /* Need two fds for the channel. */ | |
2328 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2329 | if (ret < 0) { | |
2330 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2331 | goto error_fd_get; | |
2332 | } | |
2333 | ||
2334 | /* Duplicate object for stream once the original is in the registry. */ | |
2335 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2336 | if (ret < 0) { | |
2337 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2338 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2339 | goto error; | |
2340 | } | |
2341 | ua_chan->handle = ua_chan->obj->handle; | |
2342 | ||
2343 | return 0; | |
2344 | ||
2345 | error: | |
2346 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2347 | error_fd_get: | |
2348 | return ret; | |
2349 | } | |
2350 | ||
2351 | /* | |
2352 | * For a given channel buffer registry, setup all streams of the given ust | |
2353 | * application channel. | |
2354 | * | |
2355 | * Return 0 on success or else a negative value. | |
2356 | */ | |
2357 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
2358 | struct ust_app_channel *ua_chan) | |
2359 | { | |
2360 | int ret = 0; | |
2361 | struct ust_app_stream *stream, *stmp; | |
2362 | ||
2363 | assert(reg_chan); | |
2364 | assert(ua_chan); | |
2365 | ||
2366 | DBG2("UST app setup buffer registry stream"); | |
2367 | ||
2368 | /* Send all streams to application. */ | |
2369 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2370 | struct buffer_reg_stream *reg_stream; | |
2371 | ||
2372 | ret = buffer_reg_stream_create(®_stream); | |
2373 | if (ret < 0) { | |
2374 | goto error; | |
2375 | } | |
2376 | ||
2377 | /* | |
2378 | * Keep original pointer and nullify it in the stream so the delete | |
2379 | * stream call does not release the object. | |
2380 | */ | |
2381 | reg_stream->obj.ust = stream->obj; | |
2382 | stream->obj = NULL; | |
2383 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2384 | |
7972aab2 DG |
2385 | /* We don't need the streams anymore. */ |
2386 | cds_list_del(&stream->list); | |
2387 | delete_ust_app_stream(-1, stream); | |
2388 | } | |
421cb601 | 2389 | |
7972aab2 DG |
2390 | error: |
2391 | return ret; | |
2392 | } | |
2393 | ||
2394 | /* | |
2395 | * Create a buffer registry channel for the given session registry and | |
2396 | * application channel object. If regp pointer is valid, it's set with the | |
2397 | * created object. Important, the created object is NOT added to the session | |
2398 | * registry hash table. | |
2399 | * | |
2400 | * Return 0 on success else a negative value. | |
2401 | */ | |
2402 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2403 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2404 | { | |
2405 | int ret; | |
2406 | struct buffer_reg_channel *reg_chan = NULL; | |
2407 | ||
2408 | assert(reg_sess); | |
2409 | assert(ua_chan); | |
2410 | ||
2411 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2412 | ||
2413 | /* Create buffer registry channel. */ | |
2414 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2415 | if (ret < 0) { | |
2416 | goto error_create; | |
421cb601 | 2417 | } |
7972aab2 DG |
2418 | assert(reg_chan); |
2419 | reg_chan->consumer_key = ua_chan->key; | |
8c924c7b | 2420 | reg_chan->subbuf_size = ua_chan->attr.subbuf_size; |
d07ceecd | 2421 | reg_chan->num_subbuf = ua_chan->attr.num_subbuf; |
421cb601 | 2422 | |
7972aab2 DG |
2423 | /* Create and add a channel registry to session. */ |
2424 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2425 | ua_chan->tracing_channel_id); | |
2426 | if (ret < 0) { | |
2427 | goto error; | |
d88aee68 | 2428 | } |
7972aab2 | 2429 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2430 | |
7972aab2 DG |
2431 | if (regp) { |
2432 | *regp = reg_chan; | |
3d8ca23b | 2433 | } |
d88aee68 | 2434 | |
7972aab2 | 2435 | return 0; |
3d8ca23b DG |
2436 | |
2437 | error: | |
7972aab2 DG |
2438 | /* Safe because the registry channel object was not added to any HT. */ |
2439 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2440 | error_create: | |
3d8ca23b | 2441 | return ret; |
421cb601 DG |
2442 | } |
2443 | ||
55cc08a6 | 2444 | /* |
7972aab2 DG |
2445 | * Setup buffer registry channel for the given session registry and application |
2446 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2447 | * |
7972aab2 | 2448 | * Return 0 on success else a negative value. |
55cc08a6 | 2449 | */ |
7972aab2 DG |
2450 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
2451 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan) | |
55cc08a6 | 2452 | { |
7972aab2 | 2453 | int ret; |
55cc08a6 | 2454 | |
7972aab2 DG |
2455 | assert(reg_sess); |
2456 | assert(reg_chan); | |
2457 | assert(ua_chan); | |
2458 | assert(ua_chan->obj); | |
55cc08a6 | 2459 | |
7972aab2 | 2460 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2461 | |
7972aab2 DG |
2462 | /* Setup all streams for the registry. */ |
2463 | ret = setup_buffer_reg_streams(reg_chan, ua_chan); | |
2464 | if (ret < 0) { | |
55cc08a6 DG |
2465 | goto error; |
2466 | } | |
2467 | ||
7972aab2 DG |
2468 | reg_chan->obj.ust = ua_chan->obj; |
2469 | ua_chan->obj = NULL; | |
55cc08a6 | 2470 | |
7972aab2 | 2471 | return 0; |
55cc08a6 DG |
2472 | |
2473 | error: | |
7972aab2 DG |
2474 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2475 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2476 | return ret; |
2477 | } | |
2478 | ||
edb67388 | 2479 | /* |
7972aab2 | 2480 | * Send buffer registry channel to the application. |
d0b96690 | 2481 | * |
7972aab2 | 2482 | * Return 0 on success else a negative value. |
edb67388 | 2483 | */ |
7972aab2 DG |
2484 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2485 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2486 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2487 | { |
2488 | int ret; | |
7972aab2 | 2489 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2490 | |
7972aab2 DG |
2491 | assert(reg_chan); |
2492 | assert(app); | |
2493 | assert(ua_sess); | |
2494 | assert(ua_chan); | |
2495 | ||
2496 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2497 | ||
2498 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2499 | if (ret < 0) { |
2500 | goto error; | |
2501 | } | |
2502 | ||
7972aab2 DG |
2503 | /* Send channel to the application. */ |
2504 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
2505 | if (ret < 0) { | |
2506 | goto error; | |
2507 | } | |
2508 | ||
2509 | health_code_update(); | |
2510 | ||
2511 | /* Send all streams to application. */ | |
2512 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2513 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2514 | struct ust_app_stream stream; | |
2515 | ||
2516 | ret = duplicate_stream_object(reg_stream, &stream); | |
2517 | if (ret < 0) { | |
2518 | goto error_stream_unlock; | |
2519 | } | |
2520 | ||
2521 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2522 | if (ret < 0) { | |
8c067051 | 2523 | (void) release_ust_app_stream(-1, &stream); |
7972aab2 DG |
2524 | goto error_stream_unlock; |
2525 | } | |
edb67388 | 2526 | |
7972aab2 DG |
2527 | /* |
2528 | * The return value is not important here. This function will output an | |
2529 | * error if needed. | |
2530 | */ | |
2531 | (void) release_ust_app_stream(-1, &stream); | |
2532 | } | |
2533 | ua_chan->is_sent = 1; | |
2534 | ||
2535 | error_stream_unlock: | |
2536 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2537 | error: |
2538 | return ret; | |
2539 | } | |
2540 | ||
9730260e | 2541 | /* |
7972aab2 DG |
2542 | * Create and send to the application the created buffers with per UID buffers. |
2543 | * | |
2544 | * Return 0 on success else a negative value. | |
9730260e | 2545 | */ |
7972aab2 DG |
2546 | static int create_channel_per_uid(struct ust_app *app, |
2547 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2548 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2549 | { |
2550 | int ret; | |
7972aab2 DG |
2551 | struct buffer_reg_uid *reg_uid; |
2552 | struct buffer_reg_channel *reg_chan; | |
9730260e | 2553 | |
7972aab2 DG |
2554 | assert(app); |
2555 | assert(usess); | |
2556 | assert(ua_sess); | |
2557 | assert(ua_chan); | |
2558 | ||
2559 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2560 | ||
2561 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2562 | /* | |
2563 | * The session creation handles the creation of this global registry | |
2564 | * object. If none can be find, there is a code flow problem or a | |
2565 | * teardown race. | |
2566 | */ | |
2567 | assert(reg_uid); | |
2568 | ||
2569 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2570 | reg_uid); | |
2571 | if (!reg_chan) { | |
2572 | /* Create the buffer registry channel object. */ | |
2573 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2574 | if (ret < 0) { | |
f14256d6 MD |
2575 | ERR("Error creating the UST channel \"%s\" registry instance", |
2576 | ua_chan->name); | |
7972aab2 DG |
2577 | goto error; |
2578 | } | |
2579 | assert(reg_chan); | |
2580 | ||
2581 | /* | |
2582 | * Create the buffers on the consumer side. This call populates the | |
2583 | * ust app channel object with all streams and data object. | |
2584 | */ | |
2585 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2586 | app->bits_per_long, reg_uid->registry->reg.ust); | |
2587 | if (ret < 0) { | |
f14256d6 MD |
2588 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
2589 | ua_chan->name); | |
2590 | ||
07d2ae95 DG |
2591 | /* |
2592 | * Let's remove the previously created buffer registry channel so | |
2593 | * it's not visible anymore in the session registry. | |
2594 | */ | |
2595 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, | |
2596 | ua_chan->tracing_channel_id); | |
2597 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
2598 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
7972aab2 DG |
2599 | goto error; |
2600 | } | |
2601 | ||
2602 | /* | |
2603 | * Setup the streams and add it to the session registry. | |
2604 | */ | |
2605 | ret = setup_buffer_reg_channel(reg_uid->registry, ua_chan, reg_chan); | |
2606 | if (ret < 0) { | |
f14256d6 MD |
2607 | ERR("Error setting up UST channel \"%s\"", |
2608 | ua_chan->name); | |
7972aab2 DG |
2609 | goto error; |
2610 | } | |
2611 | ||
2612 | } | |
2613 | ||
2614 | /* Send buffers to the application. */ | |
2615 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
9730260e | 2616 | if (ret < 0) { |
f14256d6 MD |
2617 | /* |
2618 | * Don't report error to the console, since it may be | |
2619 | * caused by application concurrently exiting. | |
2620 | */ | |
9730260e DG |
2621 | goto error; |
2622 | } | |
2623 | ||
9730260e DG |
2624 | error: |
2625 | return ret; | |
2626 | } | |
2627 | ||
78f0bacd | 2628 | /* |
7972aab2 DG |
2629 | * Create and send to the application the created buffers with per PID buffers. |
2630 | * | |
2631 | * Return 0 on success else a negative value. | |
78f0bacd | 2632 | */ |
7972aab2 DG |
2633 | static int create_channel_per_pid(struct ust_app *app, |
2634 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2635 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2636 | { |
8535a6d9 | 2637 | int ret; |
7972aab2 | 2638 | struct ust_registry_session *registry; |
78f0bacd | 2639 | |
7972aab2 DG |
2640 | assert(app); |
2641 | assert(usess); | |
2642 | assert(ua_sess); | |
2643 | assert(ua_chan); | |
2644 | ||
2645 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2646 | ||
2647 | rcu_read_lock(); | |
2648 | ||
2649 | registry = get_session_registry(ua_sess); | |
2650 | assert(registry); | |
2651 | ||
2652 | /* Create and add a new channel registry to session. */ | |
2653 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd | 2654 | if (ret < 0) { |
f14256d6 MD |
2655 | ERR("Error creating the UST channel \"%s\" registry instance", |
2656 | ua_chan->name); | |
78f0bacd DG |
2657 | goto error; |
2658 | } | |
2659 | ||
7972aab2 DG |
2660 | /* Create and get channel on the consumer side. */ |
2661 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2662 | app->bits_per_long, registry); | |
2663 | if (ret < 0) { | |
f14256d6 MD |
2664 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
2665 | ua_chan->name); | |
7972aab2 DG |
2666 | goto error; |
2667 | } | |
2668 | ||
2669 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
2670 | if (ret < 0) { | |
f14256d6 MD |
2671 | /* |
2672 | * Don't report error to the console, since it may be | |
2673 | * caused by application concurrently exiting. | |
2674 | */ | |
7972aab2 DG |
2675 | goto error; |
2676 | } | |
8535a6d9 | 2677 | |
78f0bacd | 2678 | error: |
7972aab2 | 2679 | rcu_read_unlock(); |
78f0bacd DG |
2680 | return ret; |
2681 | } | |
2682 | ||
2683 | /* | |
7972aab2 DG |
2684 | * From an already allocated ust app channel, create the channel buffers if |
2685 | * need and send it to the application. This MUST be called with a RCU read | |
2686 | * side lock acquired. | |
2687 | * | |
2688 | * Return 0 on success or else a negative value. | |
78f0bacd | 2689 | */ |
7972aab2 DG |
2690 | static int do_create_channel(struct ust_app *app, |
2691 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2692 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2693 | { |
7972aab2 | 2694 | int ret; |
78f0bacd | 2695 | |
7972aab2 DG |
2696 | assert(app); |
2697 | assert(usess); | |
2698 | assert(ua_sess); | |
2699 | assert(ua_chan); | |
2700 | ||
2701 | /* Handle buffer type before sending the channel to the application. */ | |
2702 | switch (usess->buffer_type) { | |
2703 | case LTTNG_BUFFER_PER_UID: | |
2704 | { | |
2705 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
2706 | if (ret < 0) { | |
2707 | goto error; | |
2708 | } | |
2709 | break; | |
2710 | } | |
2711 | case LTTNG_BUFFER_PER_PID: | |
2712 | { | |
2713 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
2714 | if (ret < 0) { | |
2715 | goto error; | |
2716 | } | |
2717 | break; | |
2718 | } | |
2719 | default: | |
2720 | assert(0); | |
2721 | ret = -EINVAL; | |
78f0bacd DG |
2722 | goto error; |
2723 | } | |
2724 | ||
7972aab2 DG |
2725 | /* Initialize ust objd object using the received handle and add it. */ |
2726 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
2727 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 2728 | |
7972aab2 DG |
2729 | /* If channel is not enabled, disable it on the tracer */ |
2730 | if (!ua_chan->enabled) { | |
2731 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2732 | if (ret < 0) { | |
2733 | goto error; | |
2734 | } | |
78f0bacd DG |
2735 | } |
2736 | ||
2737 | error: | |
2738 | return ret; | |
2739 | } | |
2740 | ||
284d8f55 | 2741 | /* |
4d710ac2 DG |
2742 | * Create UST app channel and create it on the tracer. Set ua_chanp of the |
2743 | * newly created channel if not NULL. | |
d0b96690 | 2744 | * |
36b588ed | 2745 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 DG |
2746 | * |
2747 | * Return 0 on success or else a negative value. | |
284d8f55 | 2748 | */ |
4d710ac2 DG |
2749 | static int create_ust_app_channel(struct ust_app_session *ua_sess, |
2750 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
7972aab2 | 2751 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 2752 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
2753 | { |
2754 | int ret = 0; | |
bec39940 DG |
2755 | struct lttng_ht_iter iter; |
2756 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
2757 | struct ust_app_channel *ua_chan; |
2758 | ||
2759 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
2760 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
2761 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 2762 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 2763 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 2764 | goto end; |
5b4a0ec0 DG |
2765 | } |
2766 | ||
d0b96690 | 2767 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
2768 | if (ua_chan == NULL) { |
2769 | /* Only malloc can fail here */ | |
4d710ac2 | 2770 | ret = -ENOMEM; |
094d1690 | 2771 | goto error_alloc; |
fc34caaa DG |
2772 | } |
2773 | shadow_copy_channel(ua_chan, uchan); | |
2774 | ||
ffe60014 DG |
2775 | /* Set channel type. */ |
2776 | ua_chan->attr.type = type; | |
2777 | ||
7972aab2 | 2778 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
5b4a0ec0 DG |
2779 | if (ret < 0) { |
2780 | goto error; | |
2781 | } | |
2782 | ||
fc34caaa | 2783 | DBG2("UST app create channel %s for PID %d completed", ua_chan->name, |
852d0037 | 2784 | app->pid); |
fc34caaa | 2785 | |
d0b96690 DG |
2786 | /* Only add the channel if successful on the tracer side. */ |
2787 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
2788 | ||
fc34caaa | 2789 | end: |
4d710ac2 DG |
2790 | if (ua_chanp) { |
2791 | *ua_chanp = ua_chan; | |
2792 | } | |
2793 | ||
2794 | /* Everything went well. */ | |
2795 | return 0; | |
5b4a0ec0 DG |
2796 | |
2797 | error: | |
d0b96690 | 2798 | delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app); |
094d1690 | 2799 | error_alloc: |
4d710ac2 | 2800 | return ret; |
5b4a0ec0 DG |
2801 | } |
2802 | ||
2803 | /* | |
2804 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
2805 | * |
2806 | * Called with ust app session mutex held. | |
5b4a0ec0 | 2807 | */ |
edb67388 DG |
2808 | static |
2809 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
2810 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
2811 | struct ust_app *app) | |
284d8f55 | 2812 | { |
edb67388 | 2813 | int ret = 0; |
5b4a0ec0 | 2814 | struct ust_app_event *ua_event; |
284d8f55 | 2815 | |
5b4a0ec0 | 2816 | /* Get event node */ |
18eace3b | 2817 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 2818 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 2819 | if (ua_event != NULL) { |
fc34caaa | 2820 | ret = -EEXIST; |
edb67388 DG |
2821 | goto end; |
2822 | } | |
5b4a0ec0 | 2823 | |
edb67388 DG |
2824 | /* Does not exist so create one */ |
2825 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); | |
2826 | if (ua_event == NULL) { | |
2827 | /* Only malloc can failed so something is really wrong */ | |
2828 | ret = -ENOMEM; | |
fc34caaa | 2829 | goto end; |
5b4a0ec0 | 2830 | } |
edb67388 | 2831 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 2832 | |
edb67388 | 2833 | /* Create it on the tracer side */ |
5b4a0ec0 | 2834 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 2835 | if (ret < 0) { |
fc34caaa | 2836 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 2837 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
2838 | goto error; |
2839 | } | |
2840 | ||
d0b96690 | 2841 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 2842 | |
fc34caaa | 2843 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 2844 | app->pid); |
7f79d3a1 | 2845 | |
edb67388 | 2846 | end: |
fc34caaa DG |
2847 | return ret; |
2848 | ||
5b4a0ec0 | 2849 | error: |
fc34caaa DG |
2850 | /* Valid. Calling here is already in a read side lock */ |
2851 | delete_ust_app_event(-1, ua_event); | |
edb67388 | 2852 | return ret; |
5b4a0ec0 DG |
2853 | } |
2854 | ||
2855 | /* | |
2856 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 2857 | * |
7972aab2 | 2858 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
2859 | */ |
2860 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
ad7a9107 | 2861 | struct ust_app *app, struct consumer_output *consumer) |
5b4a0ec0 DG |
2862 | { |
2863 | int ret = 0; | |
ffe60014 | 2864 | struct ust_app_channel *metadata; |
d88aee68 | 2865 | struct consumer_socket *socket; |
7972aab2 | 2866 | struct ust_registry_session *registry; |
5b4a0ec0 | 2867 | |
ffe60014 DG |
2868 | assert(ua_sess); |
2869 | assert(app); | |
d88aee68 | 2870 | assert(consumer); |
5b4a0ec0 | 2871 | |
7972aab2 DG |
2872 | registry = get_session_registry(ua_sess); |
2873 | assert(registry); | |
2874 | ||
ce34fcd0 MD |
2875 | pthread_mutex_lock(®istry->lock); |
2876 | ||
1b532a60 DG |
2877 | /* Metadata already exists for this registry or it was closed previously */ |
2878 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
2879 | ret = 0; |
2880 | goto error; | |
5b4a0ec0 DG |
2881 | } |
2882 | ||
ffe60014 | 2883 | /* Allocate UST metadata */ |
d0b96690 | 2884 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
2885 | if (!metadata) { |
2886 | /* malloc() failed */ | |
2887 | ret = -ENOMEM; | |
2888 | goto error; | |
2889 | } | |
5b4a0ec0 | 2890 | |
ad7a9107 | 2891 | memcpy(&metadata->attr, &ua_sess->metadata_attr, sizeof(metadata->attr)); |
5b4a0ec0 | 2892 | |
7972aab2 DG |
2893 | /* Need one fd for the channel. */ |
2894 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2895 | if (ret < 0) { | |
2896 | ERR("Exhausted number of available FD upon create metadata"); | |
2897 | goto error; | |
2898 | } | |
2899 | ||
4dc3dfc5 DG |
2900 | /* Get the right consumer socket for the application. */ |
2901 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
2902 | if (!socket) { | |
2903 | ret = -EINVAL; | |
2904 | goto error_consumer; | |
2905 | } | |
2906 | ||
331744e3 JD |
2907 | /* |
2908 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
2909 | * to the registry *before* we ask the consumer so we avoid the race of the | |
2910 | * consumer requesting the metadata and the ask_channel call on our side | |
2911 | * did not returned yet. | |
2912 | */ | |
2913 | registry->metadata_key = metadata->key; | |
2914 | ||
d88aee68 DG |
2915 | /* |
2916 | * Ask the metadata channel creation to the consumer. The metadata object | |
2917 | * will be created by the consumer and kept their. However, the stream is | |
2918 | * never added or monitored until we do a first push metadata to the | |
2919 | * consumer. | |
2920 | */ | |
7972aab2 DG |
2921 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
2922 | registry); | |
d88aee68 | 2923 | if (ret < 0) { |
f2a444f1 DG |
2924 | /* Nullify the metadata key so we don't try to close it later on. */ |
2925 | registry->metadata_key = 0; | |
d88aee68 DG |
2926 | goto error_consumer; |
2927 | } | |
2928 | ||
2929 | /* | |
2930 | * The setup command will make the metadata stream be sent to the relayd, | |
2931 | * if applicable, and the thread managing the metadatas. This is important | |
2932 | * because after this point, if an error occurs, the only way the stream | |
2933 | * can be deleted is to be monitored in the consumer. | |
2934 | */ | |
7972aab2 | 2935 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 2936 | if (ret < 0) { |
f2a444f1 DG |
2937 | /* Nullify the metadata key so we don't try to close it later on. */ |
2938 | registry->metadata_key = 0; | |
d88aee68 | 2939 | goto error_consumer; |
5b4a0ec0 DG |
2940 | } |
2941 | ||
7972aab2 DG |
2942 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
2943 | metadata->key, app->pid); | |
5b4a0ec0 | 2944 | |
d88aee68 | 2945 | error_consumer: |
b80f0b6c | 2946 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 2947 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 2948 | error: |
ce34fcd0 | 2949 | pthread_mutex_unlock(®istry->lock); |
ffe60014 | 2950 | return ret; |
5b4a0ec0 DG |
2951 | } |
2952 | ||
5b4a0ec0 | 2953 | /* |
d88aee68 DG |
2954 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
2955 | * acquired before calling this function. | |
5b4a0ec0 DG |
2956 | */ |
2957 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
2958 | { | |
d88aee68 | 2959 | struct ust_app *app = NULL; |
bec39940 DG |
2960 | struct lttng_ht_node_ulong *node; |
2961 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 2962 | |
bec39940 DG |
2963 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
2964 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
2965 | if (node == NULL) { |
2966 | DBG2("UST app no found with pid %d", pid); | |
2967 | goto error; | |
2968 | } | |
5b4a0ec0 DG |
2969 | |
2970 | DBG2("Found UST app by pid %d", pid); | |
2971 | ||
d88aee68 | 2972 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
2973 | |
2974 | error: | |
d88aee68 | 2975 | return app; |
5b4a0ec0 DG |
2976 | } |
2977 | ||
d88aee68 DG |
2978 | /* |
2979 | * Allocate and init an UST app object using the registration information and | |
2980 | * the command socket. This is called when the command socket connects to the | |
2981 | * session daemon. | |
2982 | * | |
2983 | * The object is returned on success or else NULL. | |
2984 | */ | |
d0b96690 | 2985 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 2986 | { |
d0b96690 DG |
2987 | struct ust_app *lta = NULL; |
2988 | ||
2989 | assert(msg); | |
2990 | assert(sock >= 0); | |
2991 | ||
2992 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 2993 | |
173af62f DG |
2994 | if ((msg->bits_per_long == 64 && |
2995 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
2996 | || (msg->bits_per_long == 32 && | |
2997 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 2998 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
2999 | "%d-bit long, but no consumerd for this size is available.\n", |
3000 | msg->name, msg->pid, msg->bits_per_long); | |
3001 | goto error; | |
3f2c5fcc | 3002 | } |
d0b96690 | 3003 | |
5b4a0ec0 DG |
3004 | lta = zmalloc(sizeof(struct ust_app)); |
3005 | if (lta == NULL) { | |
3006 | PERROR("malloc"); | |
d0b96690 | 3007 | goto error; |
5b4a0ec0 DG |
3008 | } |
3009 | ||
3010 | lta->ppid = msg->ppid; | |
3011 | lta->uid = msg->uid; | |
3012 | lta->gid = msg->gid; | |
d0b96690 | 3013 | |
7753dea8 | 3014 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
3015 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
3016 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
3017 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
3018 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
3019 | lta->long_alignment = msg->long_alignment; | |
3020 | lta->byte_order = msg->byte_order; | |
3021 | ||
5b4a0ec0 DG |
3022 | lta->v_major = msg->major; |
3023 | lta->v_minor = msg->minor; | |
d9bf3ca4 | 3024 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 DG |
3025 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
3026 | lta->notify_sock = -1; | |
d88aee68 DG |
3027 | |
3028 | /* Copy name and make sure it's NULL terminated. */ | |
3029 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
3030 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
3031 | ||
3032 | /* | |
3033 | * Before this can be called, when receiving the registration information, | |
3034 | * the application compatibility is checked. So, at this point, the | |
3035 | * application can work with this session daemon. | |
3036 | */ | |
d0b96690 | 3037 | lta->compatible = 1; |
5b4a0ec0 | 3038 | |
852d0037 | 3039 | lta->pid = msg->pid; |
d0b96690 | 3040 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 3041 | lta->sock = sock; |
d0b96690 | 3042 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 3043 | |
d42f20df DG |
3044 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
3045 | ||
d0b96690 DG |
3046 | error: |
3047 | return lta; | |
3048 | } | |
3049 | ||
d88aee68 DG |
3050 | /* |
3051 | * For a given application object, add it to every hash table. | |
3052 | */ | |
d0b96690 DG |
3053 | void ust_app_add(struct ust_app *app) |
3054 | { | |
3055 | assert(app); | |
3056 | assert(app->notify_sock >= 0); | |
3057 | ||
5b4a0ec0 | 3058 | rcu_read_lock(); |
852d0037 DG |
3059 | |
3060 | /* | |
3061 | * On a re-registration, we want to kick out the previous registration of | |
3062 | * that pid | |
3063 | */ | |
d0b96690 | 3064 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
3065 | |
3066 | /* | |
3067 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
3068 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
3069 | * already in the table. | |
3070 | */ | |
d0b96690 | 3071 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 3072 | |
d0b96690 DG |
3073 | /* Add application to the notify socket hash table. */ |
3074 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
3075 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 3076 | |
d0b96690 | 3077 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
3078 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
3079 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
3080 | app->v_minor); | |
5b4a0ec0 | 3081 | |
d0b96690 DG |
3082 | rcu_read_unlock(); |
3083 | } | |
3084 | ||
d88aee68 DG |
3085 | /* |
3086 | * Set the application version into the object. | |
3087 | * | |
3088 | * Return 0 on success else a negative value either an errno code or a | |
3089 | * LTTng-UST error code. | |
3090 | */ | |
d0b96690 DG |
3091 | int ust_app_version(struct ust_app *app) |
3092 | { | |
d88aee68 DG |
3093 | int ret; |
3094 | ||
d0b96690 | 3095 | assert(app); |
d88aee68 DG |
3096 | |
3097 | ret = ustctl_tracer_version(app->sock, &app->version); | |
3098 | if (ret < 0) { | |
3099 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
5368d366 | 3100 | ERR("UST app %d version failed with ret %d", app->sock, ret); |
d88aee68 | 3101 | } else { |
5368d366 | 3102 | DBG3("UST app %d version failed. Application is dead", app->sock); |
d88aee68 DG |
3103 | } |
3104 | } | |
3105 | ||
3106 | return ret; | |
5b4a0ec0 DG |
3107 | } |
3108 | ||
3109 | /* | |
3110 | * Unregister app by removing it from the global traceable app list and freeing | |
3111 | * the data struct. | |
3112 | * | |
3113 | * The socket is already closed at this point so no close to sock. | |
3114 | */ | |
3115 | void ust_app_unregister(int sock) | |
3116 | { | |
3117 | struct ust_app *lta; | |
bec39940 | 3118 | struct lttng_ht_node_ulong *node; |
c4b88406 | 3119 | struct lttng_ht_iter ust_app_sock_iter; |
bec39940 | 3120 | struct lttng_ht_iter iter; |
d42f20df | 3121 | struct ust_app_session *ua_sess; |
525b0740 | 3122 | int ret; |
5b4a0ec0 DG |
3123 | |
3124 | rcu_read_lock(); | |
886459c6 | 3125 | |
5b4a0ec0 | 3126 | /* Get the node reference for a call_rcu */ |
c4b88406 MD |
3127 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &ust_app_sock_iter); |
3128 | node = lttng_ht_iter_get_node_ulong(&ust_app_sock_iter); | |
d0b96690 | 3129 | assert(node); |
284d8f55 | 3130 | |
852d0037 | 3131 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
3132 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
3133 | ||
d88aee68 | 3134 | /* |
ce34fcd0 MD |
3135 | * For per-PID buffers, perform "push metadata" and flush all |
3136 | * application streams before removing app from hash tables, | |
3137 | * ensuring proper behavior of data_pending check. | |
c4b88406 | 3138 | * Remove sessions so they are not visible during deletion. |
d88aee68 | 3139 | */ |
d42f20df DG |
3140 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, |
3141 | node.node) { | |
7972aab2 DG |
3142 | struct ust_registry_session *registry; |
3143 | ||
d42f20df DG |
3144 | ret = lttng_ht_del(lta->sessions, &iter); |
3145 | if (ret) { | |
3146 | /* The session was already removed so scheduled for teardown. */ | |
3147 | continue; | |
3148 | } | |
3149 | ||
ce34fcd0 MD |
3150 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { |
3151 | (void) ust_app_flush_app_session(lta, ua_sess); | |
3152 | } | |
c4b88406 | 3153 | |
d42f20df DG |
3154 | /* |
3155 | * Add session to list for teardown. This is safe since at this point we | |
3156 | * are the only one using this list. | |
3157 | */ | |
d88aee68 DG |
3158 | pthread_mutex_lock(&ua_sess->lock); |
3159 | ||
3160 | /* | |
3161 | * Normally, this is done in the delete session process which is | |
3162 | * executed in the call rcu below. However, upon registration we can't | |
3163 | * afford to wait for the grace period before pushing data or else the | |
3164 | * data pending feature can race between the unregistration and stop | |
3165 | * command where the data pending command is sent *before* the grace | |
3166 | * period ended. | |
3167 | * | |
3168 | * The close metadata below nullifies the metadata pointer in the | |
3169 | * session so the delete session will NOT push/close a second time. | |
3170 | */ | |
7972aab2 | 3171 | registry = get_session_registry(ua_sess); |
ce34fcd0 | 3172 | if (registry) { |
7972aab2 DG |
3173 | /* Push metadata for application before freeing the application. */ |
3174 | (void) push_metadata(registry, ua_sess->consumer); | |
3175 | ||
3176 | /* | |
3177 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
3178 | * metadata only on destroy trace session in this case. Also, the |
3179 | * previous push metadata could have flag the metadata registry to | |
3180 | * close so don't send a close command if closed. | |
7972aab2 | 3181 | */ |
ce34fcd0 | 3182 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
3183 | /* And ask to close it for this session registry. */ |
3184 | (void) close_metadata(registry, ua_sess->consumer); | |
3185 | } | |
3186 | } | |
d42f20df | 3187 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
c4b88406 | 3188 | |
d88aee68 | 3189 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
3190 | } |
3191 | ||
c4b88406 MD |
3192 | /* Remove application from PID hash table */ |
3193 | ret = lttng_ht_del(ust_app_ht_by_sock, &ust_app_sock_iter); | |
3194 | assert(!ret); | |
3195 | ||
3196 | /* | |
3197 | * Remove application from notify hash table. The thread handling the | |
3198 | * notify socket could have deleted the node so ignore on error because | |
3199 | * either way it's valid. The close of that socket is handled by the other | |
3200 | * thread. | |
3201 | */ | |
3202 | iter.iter.node = <a->notify_sock_n.node; | |
3203 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3204 | ||
3205 | /* | |
3206 | * Ignore return value since the node might have been removed before by an | |
3207 | * add replace during app registration because the PID can be reassigned by | |
3208 | * the OS. | |
3209 | */ | |
3210 | iter.iter.node = <a->pid_n.node; | |
3211 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3212 | if (ret) { | |
3213 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
3214 | lta->pid); | |
3215 | } | |
3216 | ||
852d0037 DG |
3217 | /* Free memory */ |
3218 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
3219 | ||
5b4a0ec0 DG |
3220 | rcu_read_unlock(); |
3221 | return; | |
284d8f55 DG |
3222 | } |
3223 | ||
5b4a0ec0 DG |
3224 | /* |
3225 | * Fill events array with all events name of all registered apps. | |
3226 | */ | |
3227 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 3228 | { |
5b4a0ec0 DG |
3229 | int ret, handle; |
3230 | size_t nbmem, count = 0; | |
bec39940 | 3231 | struct lttng_ht_iter iter; |
5b4a0ec0 | 3232 | struct ust_app *app; |
c617c0c6 | 3233 | struct lttng_event *tmp_event; |
421cb601 | 3234 | |
5b4a0ec0 | 3235 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
3236 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
3237 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
3238 | PERROR("zmalloc ust app events"); |
3239 | ret = -ENOMEM; | |
421cb601 DG |
3240 | goto error; |
3241 | } | |
3242 | ||
5b4a0ec0 | 3243 | rcu_read_lock(); |
421cb601 | 3244 | |
852d0037 | 3245 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 3246 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 3247 | |
840cb59c | 3248 | health_code_update(); |
86acf0da | 3249 | |
e0c7ec2b DG |
3250 | if (!app->compatible) { |
3251 | /* | |
3252 | * TODO: In time, we should notice the caller of this error by | |
3253 | * telling him that this is a version error. | |
3254 | */ | |
3255 | continue; | |
3256 | } | |
852d0037 | 3257 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 3258 | if (handle < 0) { |
ffe60014 DG |
3259 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3260 | ERR("UST app list events getting handle failed for app pid %d", | |
3261 | app->pid); | |
3262 | } | |
5b4a0ec0 DG |
3263 | continue; |
3264 | } | |
421cb601 | 3265 | |
852d0037 | 3266 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 3267 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3268 | /* Handle ustctl error. */ |
3269 | if (ret < 0) { | |
a2ba1ab0 | 3270 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3271 | ERR("UST app tp list get failed for app %d with ret %d", |
3272 | app->sock, ret); | |
3273 | } else { | |
3274 | DBG3("UST app tp list get failed. Application is dead"); | |
3757b385 DG |
3275 | /* |
3276 | * This is normal behavior, an application can die during the | |
3277 | * creation process. Don't report an error so the execution can | |
3278 | * continue normally. Continue normal execution. | |
3279 | */ | |
3280 | break; | |
ffe60014 | 3281 | } |
98f595d4 | 3282 | free(tmp_event); |
ffe60014 DG |
3283 | goto rcu_error; |
3284 | } | |
3285 | ||
840cb59c | 3286 | health_code_update(); |
815564d8 | 3287 | if (count >= nbmem) { |
d7b3776f | 3288 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3289 | struct lttng_event *new_tmp_event; |
3290 | size_t new_nbmem; | |
3291 | ||
3292 | new_nbmem = nbmem << 1; | |
3293 | DBG2("Reallocating event list from %zu to %zu entries", | |
3294 | nbmem, new_nbmem); | |
3295 | new_tmp_event = realloc(tmp_event, | |
3296 | new_nbmem * sizeof(struct lttng_event)); | |
3297 | if (new_tmp_event == NULL) { | |
5b4a0ec0 | 3298 | PERROR("realloc ust app events"); |
c617c0c6 | 3299 | free(tmp_event); |
5b4a0ec0 DG |
3300 | ret = -ENOMEM; |
3301 | goto rcu_error; | |
3302 | } | |
53efb85a MD |
3303 | /* Zero the new memory */ |
3304 | memset(new_tmp_event + nbmem, 0, | |
3305 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
3306 | nbmem = new_nbmem; | |
3307 | tmp_event = new_tmp_event; | |
5b4a0ec0 | 3308 | } |
c617c0c6 MD |
3309 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
3310 | tmp_event[count].loglevel = uiter.loglevel; | |
3311 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
3312 | tmp_event[count].pid = app->pid; | |
3313 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 3314 | count++; |
421cb601 | 3315 | } |
421cb601 DG |
3316 | } |
3317 | ||
5b4a0ec0 | 3318 | ret = count; |
c617c0c6 | 3319 | *events = tmp_event; |
421cb601 | 3320 | |
5b4a0ec0 | 3321 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 3322 | |
5b4a0ec0 DG |
3323 | rcu_error: |
3324 | rcu_read_unlock(); | |
421cb601 | 3325 | error: |
840cb59c | 3326 | health_code_update(); |
5b4a0ec0 | 3327 | return ret; |
421cb601 DG |
3328 | } |
3329 | ||
f37d259d MD |
3330 | /* |
3331 | * Fill events array with all events name of all registered apps. | |
3332 | */ | |
3333 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
3334 | { | |
3335 | int ret, handle; | |
3336 | size_t nbmem, count = 0; | |
3337 | struct lttng_ht_iter iter; | |
3338 | struct ust_app *app; | |
c617c0c6 | 3339 | struct lttng_event_field *tmp_event; |
f37d259d MD |
3340 | |
3341 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
3342 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
3343 | if (tmp_event == NULL) { | |
f37d259d MD |
3344 | PERROR("zmalloc ust app event fields"); |
3345 | ret = -ENOMEM; | |
3346 | goto error; | |
3347 | } | |
3348 | ||
3349 | rcu_read_lock(); | |
3350 | ||
3351 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3352 | struct lttng_ust_field_iter uiter; | |
3353 | ||
840cb59c | 3354 | health_code_update(); |
86acf0da | 3355 | |
f37d259d MD |
3356 | if (!app->compatible) { |
3357 | /* | |
3358 | * TODO: In time, we should notice the caller of this error by | |
3359 | * telling him that this is a version error. | |
3360 | */ | |
3361 | continue; | |
3362 | } | |
3363 | handle = ustctl_tracepoint_field_list(app->sock); | |
3364 | if (handle < 0) { | |
ffe60014 DG |
3365 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3366 | ERR("UST app list field getting handle failed for app pid %d", | |
3367 | app->pid); | |
3368 | } | |
f37d259d MD |
3369 | continue; |
3370 | } | |
3371 | ||
3372 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 3373 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3374 | /* Handle ustctl error. */ |
3375 | if (ret < 0) { | |
a2ba1ab0 | 3376 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3377 | ERR("UST app tp list field failed for app %d with ret %d", |
3378 | app->sock, ret); | |
3379 | } else { | |
3380 | DBG3("UST app tp list field failed. Application is dead"); | |
3757b385 DG |
3381 | /* |
3382 | * This is normal behavior, an application can die during the | |
3383 | * creation process. Don't report an error so the execution can | |
98f595d4 | 3384 | * continue normally. Reset list and count for next app. |
3757b385 DG |
3385 | */ |
3386 | break; | |
ffe60014 | 3387 | } |
98f595d4 | 3388 | free(tmp_event); |
ffe60014 DG |
3389 | goto rcu_error; |
3390 | } | |
3391 | ||
840cb59c | 3392 | health_code_update(); |
f37d259d | 3393 | if (count >= nbmem) { |
d7b3776f | 3394 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3395 | struct lttng_event_field *new_tmp_event; |
3396 | size_t new_nbmem; | |
3397 | ||
3398 | new_nbmem = nbmem << 1; | |
3399 | DBG2("Reallocating event field list from %zu to %zu entries", | |
3400 | nbmem, new_nbmem); | |
3401 | new_tmp_event = realloc(tmp_event, | |
3402 | new_nbmem * sizeof(struct lttng_event_field)); | |
3403 | if (new_tmp_event == NULL) { | |
f37d259d | 3404 | PERROR("realloc ust app event fields"); |
c617c0c6 | 3405 | free(tmp_event); |
f37d259d MD |
3406 | ret = -ENOMEM; |
3407 | goto rcu_error; | |
3408 | } | |
53efb85a MD |
3409 | /* Zero the new memory */ |
3410 | memset(new_tmp_event + nbmem, 0, | |
3411 | (new_nbmem - nbmem) * sizeof(struct lttng_event_field)); | |
3412 | nbmem = new_nbmem; | |
3413 | tmp_event = new_tmp_event; | |
f37d259d | 3414 | } |
f37d259d | 3415 | |
c617c0c6 | 3416 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
2e84128e DG |
3417 | /* Mapping between these enums matches 1 to 1. */ |
3418 | tmp_event[count].type = (enum lttng_event_field_type) uiter.type; | |
c617c0c6 | 3419 | tmp_event[count].nowrite = uiter.nowrite; |
f37d259d | 3420 | |
c617c0c6 MD |
3421 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
3422 | tmp_event[count].event.loglevel = uiter.loglevel; | |
2e84128e | 3423 | tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; |
c617c0c6 MD |
3424 | tmp_event[count].event.pid = app->pid; |
3425 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
3426 | count++; |
3427 | } | |
3428 | } | |
3429 | ||
3430 | ret = count; | |
c617c0c6 | 3431 | *fields = tmp_event; |
f37d259d MD |
3432 | |
3433 | DBG2("UST app list event fields done (%zu events)", count); | |
3434 | ||
3435 | rcu_error: | |
3436 | rcu_read_unlock(); | |
3437 | error: | |
840cb59c | 3438 | health_code_update(); |
f37d259d MD |
3439 | return ret; |
3440 | } | |
3441 | ||
5b4a0ec0 DG |
3442 | /* |
3443 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
3444 | * |
3445 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
3446 | */ |
3447 | void ust_app_clean_list(void) | |
421cb601 | 3448 | { |
5b4a0ec0 | 3449 | int ret; |
659ed79f | 3450 | struct ust_app *app; |
bec39940 | 3451 | struct lttng_ht_iter iter; |
421cb601 | 3452 | |
5b4a0ec0 | 3453 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3454 | |
5b4a0ec0 | 3455 | rcu_read_lock(); |
421cb601 | 3456 | |
f1b711c4 MD |
3457 | if (ust_app_ht) { |
3458 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3459 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3460 | assert(!ret); | |
3461 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
3462 | } | |
421cb601 DG |
3463 | } |
3464 | ||
852d0037 | 3465 | /* Cleanup socket hash table */ |
f1b711c4 MD |
3466 | if (ust_app_ht_by_sock) { |
3467 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, | |
3468 | sock_n.node) { | |
3469 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); | |
3470 | assert(!ret); | |
3471 | } | |
bec39940 | 3472 | } |
852d0037 | 3473 | |
d88aee68 | 3474 | /* Cleanup notify socket hash table */ |
f1b711c4 MD |
3475 | if (ust_app_ht_by_notify_sock) { |
3476 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3477 | notify_sock_n.node) { | |
3478 | ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3479 | assert(!ret); | |
3480 | } | |
d88aee68 | 3481 | } |
36b588ed | 3482 | rcu_read_unlock(); |
d88aee68 | 3483 | |
bec39940 | 3484 | /* Destroy is done only when the ht is empty */ |
f1b711c4 MD |
3485 | if (ust_app_ht) { |
3486 | ht_cleanup_push(ust_app_ht); | |
3487 | } | |
3488 | if (ust_app_ht_by_sock) { | |
3489 | ht_cleanup_push(ust_app_ht_by_sock); | |
3490 | } | |
3491 | if (ust_app_ht_by_notify_sock) { | |
3492 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
3493 | } | |
5b4a0ec0 DG |
3494 | } |
3495 | ||
3496 | /* | |
3497 | * Init UST app hash table. | |
3498 | */ | |
57703f6e | 3499 | int ust_app_ht_alloc(void) |
5b4a0ec0 | 3500 | { |
bec39940 | 3501 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3502 | if (!ust_app_ht) { |
3503 | return -1; | |
3504 | } | |
852d0037 | 3505 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3506 | if (!ust_app_ht_by_sock) { |
3507 | return -1; | |
3508 | } | |
d0b96690 | 3509 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3510 | if (!ust_app_ht_by_notify_sock) { |
3511 | return -1; | |
3512 | } | |
3513 | return 0; | |
421cb601 DG |
3514 | } |
3515 | ||
78f0bacd DG |
3516 | /* |
3517 | * For a specific UST session, disable the channel for all registered apps. | |
3518 | */ | |
35a9059d | 3519 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3520 | struct ltt_ust_channel *uchan) |
3521 | { | |
3522 | int ret = 0; | |
bec39940 DG |
3523 | struct lttng_ht_iter iter; |
3524 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3525 | struct ust_app *app; |
3526 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3527 | struct ust_app_channel *ua_chan; |
78f0bacd DG |
3528 | |
3529 | if (usess == NULL || uchan == NULL) { | |
3530 | ERR("Disabling UST global channel with NULL values"); | |
3531 | ret = -1; | |
3532 | goto error; | |
3533 | } | |
3534 | ||
d9bf3ca4 | 3535 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 3536 | uchan->name, usess->id); |
78f0bacd DG |
3537 | |
3538 | rcu_read_lock(); | |
3539 | ||
3540 | /* For every registered applications */ | |
852d0037 | 3541 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3542 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3543 | if (!app->compatible) { |
3544 | /* | |
3545 | * TODO: In time, we should notice the caller of this error by | |
3546 | * telling him that this is a version error. | |
3547 | */ | |
3548 | continue; | |
3549 | } | |
78f0bacd DG |
3550 | ua_sess = lookup_session_by_app(usess, app); |
3551 | if (ua_sess == NULL) { | |
3552 | continue; | |
3553 | } | |
3554 | ||
8535a6d9 | 3555 | /* Get channel */ |
bec39940 DG |
3556 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3557 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
3558 | /* If the session if found for the app, the channel must be there */ |
3559 | assert(ua_chan_node); | |
3560 | ||
3561 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3562 | /* The channel must not be already disabled */ | |
3563 | assert(ua_chan->enabled == 1); | |
3564 | ||
3565 | /* Disable channel onto application */ | |
3566 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
3567 | if (ret < 0) { |
3568 | /* XXX: We might want to report this error at some point... */ | |
3569 | continue; | |
3570 | } | |
3571 | } | |
3572 | ||
3573 | rcu_read_unlock(); | |
3574 | ||
3575 | error: | |
3576 | return ret; | |
3577 | } | |
3578 | ||
3579 | /* | |
3580 | * For a specific UST session, enable the channel for all registered apps. | |
3581 | */ | |
35a9059d | 3582 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3583 | struct ltt_ust_channel *uchan) |
3584 | { | |
3585 | int ret = 0; | |
bec39940 | 3586 | struct lttng_ht_iter iter; |
78f0bacd DG |
3587 | struct ust_app *app; |
3588 | struct ust_app_session *ua_sess; | |
3589 | ||
3590 | if (usess == NULL || uchan == NULL) { | |
3591 | ERR("Adding UST global channel to NULL values"); | |
3592 | ret = -1; | |
3593 | goto error; | |
3594 | } | |
3595 | ||
d9bf3ca4 | 3596 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 3597 | uchan->name, usess->id); |
78f0bacd DG |
3598 | |
3599 | rcu_read_lock(); | |
3600 | ||
3601 | /* For every registered applications */ | |
852d0037 | 3602 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3603 | if (!app->compatible) { |
3604 | /* | |
3605 | * TODO: In time, we should notice the caller of this error by | |
3606 | * telling him that this is a version error. | |
3607 | */ | |
3608 | continue; | |
3609 | } | |
78f0bacd DG |
3610 | ua_sess = lookup_session_by_app(usess, app); |
3611 | if (ua_sess == NULL) { | |
3612 | continue; | |
3613 | } | |
3614 | ||
3615 | /* Enable channel onto application */ | |
3616 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
3617 | if (ret < 0) { | |
3618 | /* XXX: We might want to report this error at some point... */ | |
3619 | continue; | |
3620 | } | |
3621 | } | |
3622 | ||
3623 | rcu_read_unlock(); | |
3624 | ||
3625 | error: | |
3626 | return ret; | |
3627 | } | |
3628 | ||
b0a40d28 DG |
3629 | /* |
3630 | * Disable an event in a channel and for a specific session. | |
3631 | */ | |
35a9059d DG |
3632 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
3633 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
3634 | { |
3635 | int ret = 0; | |
bec39940 DG |
3636 | struct lttng_ht_iter iter, uiter; |
3637 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
b0a40d28 DG |
3638 | struct ust_app *app; |
3639 | struct ust_app_session *ua_sess; | |
3640 | struct ust_app_channel *ua_chan; | |
3641 | struct ust_app_event *ua_event; | |
3642 | ||
3643 | DBG("UST app disabling event %s for all apps in channel " | |
d9bf3ca4 MD |
3644 | "%s for session id %" PRIu64, |
3645 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
3646 | |
3647 | rcu_read_lock(); | |
3648 | ||
3649 | /* For all registered applications */ | |
852d0037 | 3650 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3651 | if (!app->compatible) { |
3652 | /* | |
3653 | * TODO: In time, we should notice the caller of this error by | |
3654 | * telling him that this is a version error. | |
3655 | */ | |
3656 | continue; | |
3657 | } | |
b0a40d28 DG |
3658 | ua_sess = lookup_session_by_app(usess, app); |
3659 | if (ua_sess == NULL) { | |
3660 | /* Next app */ | |
3661 | continue; | |
3662 | } | |
3663 | ||
3664 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3665 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3666 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 3667 | if (ua_chan_node == NULL) { |
d9bf3ca4 | 3668 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 3669 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
3670 | continue; |
3671 | } | |
3672 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3673 | ||
bec39940 DG |
3674 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter); |
3675 | ua_event_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 DG |
3676 | if (ua_event_node == NULL) { |
3677 | DBG2("Event %s not found in channel %s for app pid %d." | |
852d0037 | 3678 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
3679 | continue; |
3680 | } | |
3681 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
3682 | ||
7f79d3a1 | 3683 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
3684 | if (ret < 0) { |
3685 | /* XXX: Report error someday... */ | |
3686 | continue; | |
3687 | } | |
3688 | } | |
3689 | ||
3690 | rcu_read_unlock(); | |
3691 | ||
3692 | return ret; | |
3693 | } | |
3694 | ||
421cb601 | 3695 | /* |
5b4a0ec0 | 3696 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 3697 | */ |
35a9059d | 3698 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3699 | struct ltt_ust_channel *uchan) |
3700 | { | |
3d8ca23b | 3701 | int ret = 0, created; |
bec39940 | 3702 | struct lttng_ht_iter iter; |
48842b30 | 3703 | struct ust_app *app; |
3d8ca23b | 3704 | struct ust_app_session *ua_sess = NULL; |
48842b30 | 3705 | |
fc34caaa DG |
3706 | /* Very wrong code flow */ |
3707 | assert(usess); | |
3708 | assert(uchan); | |
421cb601 | 3709 | |
d9bf3ca4 | 3710 | DBG2("UST app adding channel %s to UST domain for session id %" PRIu64, |
a991f516 | 3711 | uchan->name, usess->id); |
48842b30 DG |
3712 | |
3713 | rcu_read_lock(); | |
421cb601 | 3714 | |
5b4a0ec0 | 3715 | /* For every registered applications */ |
852d0037 | 3716 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3717 | if (!app->compatible) { |
3718 | /* | |
3719 | * TODO: In time, we should notice the caller of this error by | |
3720 | * telling him that this is a version error. | |
3721 | */ | |
3722 | continue; | |
3723 | } | |
edb67388 DG |
3724 | /* |
3725 | * Create session on the tracer side and add it to app session HT. Note | |
3726 | * that if session exist, it will simply return a pointer to the ust | |
3727 | * app session. | |
3728 | */ | |
3d8ca23b DG |
3729 | ret = create_ust_app_session(usess, app, &ua_sess, &created); |
3730 | if (ret < 0) { | |
3731 | switch (ret) { | |
3732 | case -ENOTCONN: | |
3733 | /* | |
3734 | * The application's socket is not valid. Either a bad socket | |
3735 | * or a timeout on it. We can't inform the caller that for a | |
3736 | * specific app, the session failed so lets continue here. | |
3737 | */ | |
3738 | continue; | |
3739 | case -ENOMEM: | |
3740 | default: | |
3741 | goto error_rcu_unlock; | |
3742 | } | |
48842b30 | 3743 | } |
3d8ca23b | 3744 | assert(ua_sess); |
48842b30 | 3745 | |
d0b96690 | 3746 | pthread_mutex_lock(&ua_sess->lock); |
d65d2de8 DG |
3747 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, |
3748 | sizeof(uchan->name))) { | |
ad7a9107 DG |
3749 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, &uchan->attr); |
3750 | ret = 0; | |
d65d2de8 DG |
3751 | } else { |
3752 | /* Create channel onto application. We don't need the chan ref. */ | |
3753 | ret = create_ust_app_channel(ua_sess, uchan, app, | |
3754 | LTTNG_UST_CHAN_PER_CPU, usess, NULL); | |
3755 | } | |
d0b96690 | 3756 | pthread_mutex_unlock(&ua_sess->lock); |
3d8ca23b DG |
3757 | if (ret < 0) { |
3758 | if (ret == -ENOMEM) { | |
3759 | /* No more memory is a fatal error. Stop right now. */ | |
3760 | goto error_rcu_unlock; | |
3761 | } | |
3762 | /* Cleanup the created session if it's the case. */ | |
3763 | if (created) { | |
d0b96690 | 3764 | destroy_app_session(app, ua_sess); |
3d8ca23b | 3765 | } |
48842b30 | 3766 | } |
48842b30 | 3767 | } |
5b4a0ec0 | 3768 | |
95e047ff | 3769 | error_rcu_unlock: |
48842b30 | 3770 | rcu_read_unlock(); |
3c14c33f | 3771 | return ret; |
48842b30 DG |
3772 | } |
3773 | ||
5b4a0ec0 | 3774 | /* |
edb67388 | 3775 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 3776 | */ |
35a9059d | 3777 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3778 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3779 | { | |
3780 | int ret = 0; | |
bec39940 | 3781 | struct lttng_ht_iter iter, uiter; |
18eace3b | 3782 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
3783 | struct ust_app *app; |
3784 | struct ust_app_session *ua_sess; | |
3785 | struct ust_app_channel *ua_chan; | |
3786 | struct ust_app_event *ua_event; | |
48842b30 | 3787 | |
d9bf3ca4 | 3788 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 3789 | uevent->attr.name, usess->id); |
48842b30 | 3790 | |
edb67388 DG |
3791 | /* |
3792 | * NOTE: At this point, this function is called only if the session and | |
3793 | * channel passed are already created for all apps. and enabled on the | |
3794 | * tracer also. | |
3795 | */ | |
3796 | ||
48842b30 | 3797 | rcu_read_lock(); |
421cb601 DG |
3798 | |
3799 | /* For all registered applications */ | |
852d0037 | 3800 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3801 | if (!app->compatible) { |
3802 | /* | |
3803 | * TODO: In time, we should notice the caller of this error by | |
3804 | * telling him that this is a version error. | |
3805 | */ | |
3806 | continue; | |
3807 | } | |
edb67388 | 3808 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3809 | if (!ua_sess) { |
3810 | /* The application has problem or is probably dead. */ | |
3811 | continue; | |
3812 | } | |
ba767faf | 3813 | |
d0b96690 DG |
3814 | pthread_mutex_lock(&ua_sess->lock); |
3815 | ||
edb67388 | 3816 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3817 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3818 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3819 | /* If the channel is not found, there is a code flow error */ |
3820 | assert(ua_chan_node); | |
3821 | ||
3822 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3823 | ||
18eace3b DG |
3824 | /* Get event node */ |
3825 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
39c5a3a7 | 3826 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 3827 | if (ua_event == NULL) { |
7f79d3a1 | 3828 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 3829 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 3830 | goto next_app; |
35a9059d | 3831 | } |
35a9059d DG |
3832 | |
3833 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
3834 | if (ret < 0) { | |
d0b96690 | 3835 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 3836 | goto error; |
48842b30 | 3837 | } |
d0b96690 DG |
3838 | next_app: |
3839 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
3840 | } |
3841 | ||
7f79d3a1 | 3842 | error: |
edb67388 | 3843 | rcu_read_unlock(); |
edb67388 DG |
3844 | return ret; |
3845 | } | |
3846 | ||
3847 | /* | |
3848 | * For a specific existing UST session and UST channel, creates the event for | |
3849 | * all registered apps. | |
3850 | */ | |
35a9059d | 3851 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
3852 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3853 | { | |
3854 | int ret = 0; | |
bec39940 DG |
3855 | struct lttng_ht_iter iter, uiter; |
3856 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
3857 | struct ust_app *app; |
3858 | struct ust_app_session *ua_sess; | |
3859 | struct ust_app_channel *ua_chan; | |
3860 | ||
d9bf3ca4 | 3861 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 3862 | uevent->attr.name, usess->id); |
edb67388 | 3863 | |
edb67388 DG |
3864 | rcu_read_lock(); |
3865 | ||
3866 | /* For all registered applications */ | |
852d0037 | 3867 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3868 | if (!app->compatible) { |
3869 | /* | |
3870 | * TODO: In time, we should notice the caller of this error by | |
3871 | * telling him that this is a version error. | |
3872 | */ | |
3873 | continue; | |
3874 | } | |
edb67388 | 3875 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3876 | if (!ua_sess) { |
3877 | /* The application has problem or is probably dead. */ | |
3878 | continue; | |
3879 | } | |
48842b30 | 3880 | |
d0b96690 | 3881 | pthread_mutex_lock(&ua_sess->lock); |
48842b30 | 3882 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3883 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3884 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3885 | /* If the channel is not found, there is a code flow error */ |
3886 | assert(ua_chan_node); | |
3887 | ||
48842b30 DG |
3888 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3889 | ||
edb67388 | 3890 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 3891 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 3892 | if (ret < 0) { |
49c336c1 | 3893 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
3894 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
3895 | break; | |
3896 | } | |
3897 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 3898 | uevent->attr.name, app->pid); |
5b4a0ec0 | 3899 | continue; |
48842b30 | 3900 | } |
48842b30 | 3901 | } |
5b4a0ec0 | 3902 | |
48842b30 DG |
3903 | rcu_read_unlock(); |
3904 | ||
3905 | return ret; | |
3906 | } | |
3907 | ||
5b4a0ec0 DG |
3908 | /* |
3909 | * Start tracing for a specific UST session and app. | |
3910 | */ | |
b34cbebf | 3911 | static |
421cb601 | 3912 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
3913 | { |
3914 | int ret = 0; | |
48842b30 | 3915 | struct ust_app_session *ua_sess; |
48842b30 | 3916 | |
852d0037 | 3917 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 3918 | |
509cbaf8 MD |
3919 | rcu_read_lock(); |
3920 | ||
e0c7ec2b DG |
3921 | if (!app->compatible) { |
3922 | goto end; | |
3923 | } | |
3924 | ||
421cb601 DG |
3925 | ua_sess = lookup_session_by_app(usess, app); |
3926 | if (ua_sess == NULL) { | |
d42f20df DG |
3927 | /* The session is in teardown process. Ignore and continue. */ |
3928 | goto end; | |
421cb601 | 3929 | } |
48842b30 | 3930 | |
d0b96690 DG |
3931 | pthread_mutex_lock(&ua_sess->lock); |
3932 | ||
aea829b3 DG |
3933 | /* Upon restart, we skip the setup, already done */ |
3934 | if (ua_sess->started) { | |
8be98f9a | 3935 | goto skip_setup; |
aea829b3 | 3936 | } |
8be98f9a | 3937 | |
a4b92340 DG |
3938 | /* Create directories if consumer is LOCAL and has a path defined. */ |
3939 | if (usess->consumer->type == CONSUMER_DST_LOCAL && | |
3940 | strlen(usess->consumer->dst.trace_path) > 0) { | |
3941 | ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path, | |
7972aab2 | 3942 | S_IRWXU | S_IRWXG, ua_sess->euid, ua_sess->egid); |
a4b92340 DG |
3943 | if (ret < 0) { |
3944 | if (ret != -EEXIST) { | |
3945 | ERR("Trace directory creation error"); | |
d0b96690 | 3946 | goto error_unlock; |
421cb601 | 3947 | } |
173af62f | 3948 | } |
7753dea8 | 3949 | } |
aea829b3 | 3950 | |
d65d2de8 DG |
3951 | /* |
3952 | * Create the metadata for the application. This returns gracefully if a | |
3953 | * metadata was already set for the session. | |
3954 | */ | |
ad7a9107 | 3955 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer); |
421cb601 | 3956 | if (ret < 0) { |
d0b96690 | 3957 | goto error_unlock; |
421cb601 | 3958 | } |
48842b30 | 3959 | |
840cb59c | 3960 | health_code_update(); |
86acf0da | 3961 | |
8be98f9a | 3962 | skip_setup: |
421cb601 | 3963 | /* This start the UST tracing */ |
852d0037 | 3964 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
421cb601 | 3965 | if (ret < 0) { |
ffe60014 DG |
3966 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3967 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
3968 | app->pid, ret); | |
3969 | } else { | |
3970 | DBG("UST app start session failed. Application is dead."); | |
3757b385 DG |
3971 | /* |
3972 | * This is normal behavior, an application can die during the | |
3973 | * creation process. Don't report an error so the execution can | |
3974 | * continue normally. | |
3975 | */ | |
3976 | pthread_mutex_unlock(&ua_sess->lock); | |
3977 | goto end; | |
ffe60014 | 3978 | } |
d0b96690 | 3979 | goto error_unlock; |
421cb601 | 3980 | } |
5b4a0ec0 | 3981 | |
55c3953d DG |
3982 | /* Indicate that the session has been started once */ |
3983 | ua_sess->started = 1; | |
3984 | ||
d0b96690 DG |
3985 | pthread_mutex_unlock(&ua_sess->lock); |
3986 | ||
840cb59c | 3987 | health_code_update(); |
86acf0da | 3988 | |
421cb601 | 3989 | /* Quiescent wait after starting trace */ |
ffe60014 DG |
3990 | ret = ustctl_wait_quiescent(app->sock); |
3991 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3992 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3993 | app->pid, ret); | |
3994 | } | |
48842b30 | 3995 | |
e0c7ec2b DG |
3996 | end: |
3997 | rcu_read_unlock(); | |
840cb59c | 3998 | health_code_update(); |
421cb601 | 3999 | return 0; |
48842b30 | 4000 | |
d0b96690 DG |
4001 | error_unlock: |
4002 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 4003 | rcu_read_unlock(); |
840cb59c | 4004 | health_code_update(); |
421cb601 DG |
4005 | return -1; |
4006 | } | |
48842b30 | 4007 | |
8be98f9a MD |
4008 | /* |
4009 | * Stop tracing for a specific UST session and app. | |
4010 | */ | |
b34cbebf | 4011 | static |
8be98f9a MD |
4012 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
4013 | { | |
4014 | int ret = 0; | |
4015 | struct ust_app_session *ua_sess; | |
7972aab2 | 4016 | struct ust_registry_session *registry; |
8be98f9a | 4017 | |
852d0037 | 4018 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
4019 | |
4020 | rcu_read_lock(); | |
4021 | ||
e0c7ec2b | 4022 | if (!app->compatible) { |
d88aee68 | 4023 | goto end_no_session; |
e0c7ec2b DG |
4024 | } |
4025 | ||
8be98f9a MD |
4026 | ua_sess = lookup_session_by_app(usess, app); |
4027 | if (ua_sess == NULL) { | |
d88aee68 | 4028 | goto end_no_session; |
8be98f9a MD |
4029 | } |
4030 | ||
d88aee68 DG |
4031 | pthread_mutex_lock(&ua_sess->lock); |
4032 | ||
9bc07046 DG |
4033 | /* |
4034 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
4035 | * that was never started. It's possible since we can have a fail start |
4036 | * from either the application manager thread or the command thread. Simply | |
4037 | * indicate that this is a stop error. | |
9bc07046 | 4038 | */ |
f9dfc3d9 | 4039 | if (!ua_sess->started) { |
c45536e1 DG |
4040 | goto error_rcu_unlock; |
4041 | } | |
7db205b5 | 4042 | |
840cb59c | 4043 | health_code_update(); |
86acf0da | 4044 | |
9d6c7d3f | 4045 | /* This inhibits UST tracing */ |
852d0037 | 4046 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
9d6c7d3f | 4047 | if (ret < 0) { |
ffe60014 DG |
4048 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4049 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
4050 | app->pid, ret); | |
4051 | } else { | |
4052 | DBG("UST app stop session failed. Application is dead."); | |
3757b385 DG |
4053 | /* |
4054 | * This is normal behavior, an application can die during the | |
4055 | * creation process. Don't report an error so the execution can | |
4056 | * continue normally. | |
4057 | */ | |
4058 | goto end_unlock; | |
ffe60014 | 4059 | } |
9d6c7d3f DG |
4060 | goto error_rcu_unlock; |
4061 | } | |
4062 | ||
840cb59c | 4063 | health_code_update(); |
86acf0da | 4064 | |
9d6c7d3f | 4065 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
4066 | ret = ustctl_wait_quiescent(app->sock); |
4067 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4068 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4069 | app->pid, ret); | |
4070 | } | |
9d6c7d3f | 4071 | |
840cb59c | 4072 | health_code_update(); |
86acf0da | 4073 | |
b34cbebf MD |
4074 | registry = get_session_registry(ua_sess); |
4075 | assert(registry); | |
1b532a60 | 4076 | |
ce34fcd0 MD |
4077 | /* Push metadata for application before freeing the application. */ |
4078 | (void) push_metadata(registry, ua_sess->consumer); | |
b34cbebf | 4079 | |
3757b385 | 4080 | end_unlock: |
b34cbebf MD |
4081 | pthread_mutex_unlock(&ua_sess->lock); |
4082 | end_no_session: | |
4083 | rcu_read_unlock(); | |
4084 | health_code_update(); | |
4085 | return 0; | |
4086 | ||
4087 | error_rcu_unlock: | |
4088 | pthread_mutex_unlock(&ua_sess->lock); | |
4089 | rcu_read_unlock(); | |
4090 | health_code_update(); | |
4091 | return -1; | |
4092 | } | |
4093 | ||
b34cbebf | 4094 | static |
c4b88406 MD |
4095 | int ust_app_flush_app_session(struct ust_app *app, |
4096 | struct ust_app_session *ua_sess) | |
b34cbebf | 4097 | { |
c4b88406 | 4098 | int ret, retval = 0; |
b34cbebf | 4099 | struct lttng_ht_iter iter; |
b34cbebf | 4100 | struct ust_app_channel *ua_chan; |
c4b88406 | 4101 | struct consumer_socket *socket; |
b34cbebf | 4102 | |
c4b88406 | 4103 | DBG("Flushing app session buffers for ust app pid %d", app->pid); |
b34cbebf MD |
4104 | |
4105 | rcu_read_lock(); | |
4106 | ||
4107 | if (!app->compatible) { | |
c4b88406 | 4108 | goto end_not_compatible; |
b34cbebf MD |
4109 | } |
4110 | ||
4111 | pthread_mutex_lock(&ua_sess->lock); | |
4112 | ||
4113 | health_code_update(); | |
4114 | ||
9d6c7d3f | 4115 | /* Flushing buffers */ |
c4b88406 MD |
4116 | socket = consumer_find_socket_by_bitness(app->bits_per_long, |
4117 | ua_sess->consumer); | |
ce34fcd0 MD |
4118 | |
4119 | /* Flush buffers and push metadata. */ | |
4120 | switch (ua_sess->buffer_type) { | |
4121 | case LTTNG_BUFFER_PER_PID: | |
4122 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, | |
4123 | node.node) { | |
4124 | health_code_update(); | |
4125 | assert(ua_chan->is_sent); | |
4126 | ret = consumer_flush_channel(socket, ua_chan->key); | |
4127 | if (ret) { | |
4128 | ERR("Error flushing consumer channel"); | |
4129 | retval = -1; | |
4130 | continue; | |
4131 | } | |
8be98f9a | 4132 | } |
ce34fcd0 MD |
4133 | break; |
4134 | case LTTNG_BUFFER_PER_UID: | |
4135 | default: | |
4136 | assert(0); | |
4137 | break; | |
8be98f9a | 4138 | } |
8be98f9a | 4139 | |
840cb59c | 4140 | health_code_update(); |
86acf0da | 4141 | |
d88aee68 | 4142 | pthread_mutex_unlock(&ua_sess->lock); |
ce34fcd0 | 4143 | |
c4b88406 MD |
4144 | end_not_compatible: |
4145 | rcu_read_unlock(); | |
4146 | health_code_update(); | |
4147 | return retval; | |
4148 | } | |
4149 | ||
4150 | /* | |
ce34fcd0 MD |
4151 | * Flush buffers for all applications for a specific UST session. |
4152 | * Called with UST session lock held. | |
c4b88406 MD |
4153 | */ |
4154 | static | |
ce34fcd0 | 4155 | int ust_app_flush_session(struct ltt_ust_session *usess) |
c4b88406 MD |
4156 | |
4157 | { | |
99b1411c | 4158 | int ret = 0; |
c4b88406 | 4159 | |
ce34fcd0 | 4160 | DBG("Flushing session buffers for all ust apps"); |
c4b88406 MD |
4161 | |
4162 | rcu_read_lock(); | |
4163 | ||
ce34fcd0 MD |
4164 | /* Flush buffers and push metadata. */ |
4165 | switch (usess->buffer_type) { | |
4166 | case LTTNG_BUFFER_PER_UID: | |
4167 | { | |
4168 | struct buffer_reg_uid *reg; | |
4169 | struct lttng_ht_iter iter; | |
4170 | ||
4171 | /* Flush all per UID buffers associated to that session. */ | |
4172 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
4173 | struct ust_registry_session *ust_session_reg; | |
4174 | struct buffer_reg_channel *reg_chan; | |
4175 | struct consumer_socket *socket; | |
4176 | ||
4177 | /* Get consumer socket to use to push the metadata.*/ | |
4178 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
4179 | usess->consumer); | |
4180 | if (!socket) { | |
4181 | /* Ignore request if no consumer is found for the session. */ | |
4182 | continue; | |
4183 | } | |
4184 | ||
4185 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
4186 | reg_chan, node.node) { | |
4187 | /* | |
4188 | * The following call will print error values so the return | |
4189 | * code is of little importance because whatever happens, we | |
4190 | * have to try them all. | |
4191 | */ | |
4192 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
4193 | } | |
4194 | ||
4195 | ust_session_reg = reg->registry->reg.ust; | |
4196 | /* Push metadata. */ | |
4197 | (void) push_metadata(ust_session_reg, usess->consumer); | |
4198 | } | |
ce34fcd0 MD |
4199 | break; |
4200 | } | |
4201 | case LTTNG_BUFFER_PER_PID: | |
4202 | { | |
4203 | struct ust_app_session *ua_sess; | |
4204 | struct lttng_ht_iter iter; | |
4205 | struct ust_app *app; | |
4206 | ||
4207 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4208 | ua_sess = lookup_session_by_app(usess, app); | |
4209 | if (ua_sess == NULL) { | |
4210 | continue; | |
4211 | } | |
4212 | (void) ust_app_flush_app_session(app, ua_sess); | |
4213 | } | |
4214 | break; | |
4215 | } | |
4216 | default: | |
99b1411c | 4217 | ret = -1; |
ce34fcd0 MD |
4218 | assert(0); |
4219 | break; | |
c4b88406 | 4220 | } |
c4b88406 | 4221 | |
7db205b5 | 4222 | rcu_read_unlock(); |
840cb59c | 4223 | health_code_update(); |
c4b88406 | 4224 | return ret; |
8be98f9a MD |
4225 | } |
4226 | ||
84cd17c6 MD |
4227 | /* |
4228 | * Destroy a specific UST session in apps. | |
4229 | */ | |
3353de95 | 4230 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 4231 | { |
ffe60014 | 4232 | int ret; |
84cd17c6 | 4233 | struct ust_app_session *ua_sess; |
bec39940 | 4234 | struct lttng_ht_iter iter; |
d9bf3ca4 | 4235 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 4236 | |
852d0037 | 4237 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
4238 | |
4239 | rcu_read_lock(); | |
4240 | ||
e0c7ec2b DG |
4241 | if (!app->compatible) { |
4242 | goto end; | |
4243 | } | |
4244 | ||
84cd17c6 | 4245 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 4246 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 4247 | if (node == NULL) { |
d42f20df DG |
4248 | /* Session is being or is deleted. */ |
4249 | goto end; | |
84cd17c6 MD |
4250 | } |
4251 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 4252 | |
840cb59c | 4253 | health_code_update(); |
d0b96690 | 4254 | destroy_app_session(app, ua_sess); |
84cd17c6 | 4255 | |
840cb59c | 4256 | health_code_update(); |
7db205b5 | 4257 | |
84cd17c6 | 4258 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
4259 | ret = ustctl_wait_quiescent(app->sock); |
4260 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4261 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4262 | app->pid, ret); | |
4263 | } | |
e0c7ec2b DG |
4264 | end: |
4265 | rcu_read_unlock(); | |
840cb59c | 4266 | health_code_update(); |
84cd17c6 | 4267 | return 0; |
84cd17c6 MD |
4268 | } |
4269 | ||
5b4a0ec0 DG |
4270 | /* |
4271 | * Start tracing for the UST session. | |
4272 | */ | |
421cb601 DG |
4273 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
4274 | { | |
4275 | int ret = 0; | |
bec39940 | 4276 | struct lttng_ht_iter iter; |
421cb601 | 4277 | struct ust_app *app; |
48842b30 | 4278 | |
421cb601 DG |
4279 | DBG("Starting all UST traces"); |
4280 | ||
4281 | rcu_read_lock(); | |
421cb601 | 4282 | |
852d0037 | 4283 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
421cb601 | 4284 | ret = ust_app_start_trace(usess, app); |
48842b30 | 4285 | if (ret < 0) { |
5b4a0ec0 DG |
4286 | /* Continue to next apps even on error */ |
4287 | continue; | |
48842b30 | 4288 | } |
48842b30 | 4289 | } |
5b4a0ec0 | 4290 | |
48842b30 DG |
4291 | rcu_read_unlock(); |
4292 | ||
4293 | return 0; | |
4294 | } | |
487cf67c | 4295 | |
8be98f9a MD |
4296 | /* |
4297 | * Start tracing for the UST session. | |
ce34fcd0 | 4298 | * Called with UST session lock held. |
8be98f9a MD |
4299 | */ |
4300 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
4301 | { | |
4302 | int ret = 0; | |
bec39940 | 4303 | struct lttng_ht_iter iter; |
8be98f9a MD |
4304 | struct ust_app *app; |
4305 | ||
4306 | DBG("Stopping all UST traces"); | |
4307 | ||
4308 | rcu_read_lock(); | |
4309 | ||
b34cbebf MD |
4310 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4311 | ret = ust_app_stop_trace(usess, app); | |
4312 | if (ret < 0) { | |
4313 | /* Continue to next apps even on error */ | |
4314 | continue; | |
4315 | } | |
4316 | } | |
4317 | ||
ce34fcd0 | 4318 | (void) ust_app_flush_session(usess); |
8be98f9a MD |
4319 | |
4320 | rcu_read_unlock(); | |
4321 | ||
4322 | return 0; | |
4323 | } | |
4324 | ||
84cd17c6 MD |
4325 | /* |
4326 | * Destroy app UST session. | |
4327 | */ | |
4328 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
4329 | { | |
4330 | int ret = 0; | |
bec39940 | 4331 | struct lttng_ht_iter iter; |
84cd17c6 MD |
4332 | struct ust_app *app; |
4333 | ||
4334 | DBG("Destroy all UST traces"); | |
4335 | ||
4336 | rcu_read_lock(); | |
4337 | ||
852d0037 | 4338 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 4339 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
4340 | if (ret < 0) { |
4341 | /* Continue to next apps even on error */ | |
4342 | continue; | |
4343 | } | |
4344 | } | |
4345 | ||
4346 | rcu_read_unlock(); | |
4347 | ||
4348 | return 0; | |
4349 | } | |
4350 | ||
5b4a0ec0 DG |
4351 | /* |
4352 | * Add channels/events from UST global domain to registered apps at sock. | |
4353 | */ | |
487cf67c DG |
4354 | void ust_app_global_update(struct ltt_ust_session *usess, int sock) |
4355 | { | |
55c54cce | 4356 | int ret = 0; |
31746f93 | 4357 | struct lttng_ht_iter iter, uiter; |
487cf67c | 4358 | struct ust_app *app; |
3d8ca23b | 4359 | struct ust_app_session *ua_sess = NULL; |
487cf67c DG |
4360 | struct ust_app_channel *ua_chan; |
4361 | struct ust_app_event *ua_event; | |
727d5404 | 4362 | struct ust_app_ctx *ua_ctx; |
1f3580c7 | 4363 | |
95e047ff | 4364 | assert(usess); |
ffe60014 | 4365 | assert(sock >= 0); |
1f3580c7 | 4366 | |
d9bf3ca4 | 4367 | DBG2("UST app global update for app sock %d for session id %" PRIu64, sock, |
a991f516 | 4368 | usess->id); |
487cf67c | 4369 | |
284d8f55 DG |
4370 | rcu_read_lock(); |
4371 | ||
f20baf8e | 4372 | app = ust_app_find_by_sock(sock); |
487cf67c | 4373 | if (app == NULL) { |
d88aee68 DG |
4374 | /* |
4375 | * Application can be unregistered before so this is possible hence | |
4376 | * simply stopping the update. | |
4377 | */ | |
4378 | DBG3("UST app update failed to find app sock %d", sock); | |
487cf67c DG |
4379 | goto error; |
4380 | } | |
4381 | ||
e0c7ec2b DG |
4382 | if (!app->compatible) { |
4383 | goto error; | |
4384 | } | |
4385 | ||
3d8ca23b DG |
4386 | ret = create_ust_app_session(usess, app, &ua_sess, NULL); |
4387 | if (ret < 0) { | |
4388 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
4389 | goto error; |
4390 | } | |
3d8ca23b | 4391 | assert(ua_sess); |
487cf67c | 4392 | |
d0b96690 DG |
4393 | pthread_mutex_lock(&ua_sess->lock); |
4394 | ||
284d8f55 | 4395 | /* |
d0b96690 | 4396 | * We can iterate safely here over all UST app session since the create ust |
284d8f55 DG |
4397 | * app session above made a shadow copy of the UST global domain from the |
4398 | * ltt ust session. | |
4399 | */ | |
bec39940 DG |
4400 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
4401 | node.node) { | |
ad7a9107 DG |
4402 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
4403 | if (ret < 0) { | |
4404 | /* | |
4405 | * Stop everything. On error, the application failed, no more | |
4406 | * file descriptor are available or ENOMEM so stopping here is | |
4407 | * the only thing we can do for now. | |
4408 | */ | |
4409 | goto error_unlock; | |
487cf67c DG |
4410 | } |
4411 | ||
31746f93 DG |
4412 | /* |
4413 | * Add context using the list so they are enabled in the same order the | |
4414 | * user added them. | |
4415 | */ | |
4416 | cds_list_for_each_entry(ua_ctx, &ua_chan->ctx_list, list) { | |
727d5404 DG |
4417 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); |
4418 | if (ret < 0) { | |
d0b96690 | 4419 | goto error_unlock; |
727d5404 DG |
4420 | } |
4421 | } | |
4422 | ||
4423 | ||
284d8f55 | 4424 | /* For each events */ |
bec39940 DG |
4425 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
4426 | node.node) { | |
284d8f55 DG |
4427 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
4428 | if (ret < 0) { | |
d0b96690 | 4429 | goto error_unlock; |
487cf67c | 4430 | } |
36dc12cc | 4431 | } |
487cf67c DG |
4432 | } |
4433 | ||
d0b96690 DG |
4434 | pthread_mutex_unlock(&ua_sess->lock); |
4435 | ||
14fb1ebe | 4436 | if (usess->active) { |
421cb601 | 4437 | ret = ust_app_start_trace(usess, app); |
36dc12cc | 4438 | if (ret < 0) { |
36dc12cc DG |
4439 | goto error; |
4440 | } | |
4441 | ||
852d0037 | 4442 | DBG2("UST trace started for app pid %d", app->pid); |
36dc12cc DG |
4443 | } |
4444 | ||
ffe60014 DG |
4445 | /* Everything went well at this point. */ |
4446 | rcu_read_unlock(); | |
4447 | return; | |
4448 | ||
d0b96690 DG |
4449 | error_unlock: |
4450 | pthread_mutex_unlock(&ua_sess->lock); | |
487cf67c | 4451 | error: |
ffe60014 | 4452 | if (ua_sess) { |
d0b96690 | 4453 | destroy_app_session(app, ua_sess); |
ffe60014 | 4454 | } |
487cf67c DG |
4455 | rcu_read_unlock(); |
4456 | return; | |
4457 | } | |
55cc08a6 DG |
4458 | |
4459 | /* | |
4460 | * Add context to a specific channel for global UST domain. | |
4461 | */ | |
4462 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
4463 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
4464 | { | |
4465 | int ret = 0; | |
bec39940 DG |
4466 | struct lttng_ht_node_str *ua_chan_node; |
4467 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
4468 | struct ust_app_channel *ua_chan = NULL; |
4469 | struct ust_app_session *ua_sess; | |
4470 | struct ust_app *app; | |
4471 | ||
4472 | rcu_read_lock(); | |
4473 | ||
852d0037 | 4474 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4475 | if (!app->compatible) { |
4476 | /* | |
4477 | * TODO: In time, we should notice the caller of this error by | |
4478 | * telling him that this is a version error. | |
4479 | */ | |
4480 | continue; | |
4481 | } | |
55cc08a6 DG |
4482 | ua_sess = lookup_session_by_app(usess, app); |
4483 | if (ua_sess == NULL) { | |
4484 | continue; | |
4485 | } | |
4486 | ||
d0b96690 | 4487 | pthread_mutex_lock(&ua_sess->lock); |
55cc08a6 | 4488 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4489 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4490 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 4491 | if (ua_chan_node == NULL) { |
d0b96690 | 4492 | goto next_app; |
55cc08a6 DG |
4493 | } |
4494 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
4495 | node); | |
55cc08a6 DG |
4496 | ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app); |
4497 | if (ret < 0) { | |
d0b96690 | 4498 | goto next_app; |
55cc08a6 | 4499 | } |
d0b96690 DG |
4500 | next_app: |
4501 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
4502 | } |
4503 | ||
55cc08a6 DG |
4504 | rcu_read_unlock(); |
4505 | return ret; | |
4506 | } | |
4507 | ||
76d45b40 DG |
4508 | /* |
4509 | * Enable event for a channel from a UST session for a specific PID. | |
4510 | */ | |
4511 | int ust_app_enable_event_pid(struct ltt_ust_session *usess, | |
4512 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4513 | { | |
4514 | int ret = 0; | |
bec39940 | 4515 | struct lttng_ht_iter iter; |
18eace3b | 4516 | struct lttng_ht_node_str *ua_chan_node; |
76d45b40 DG |
4517 | struct ust_app *app; |
4518 | struct ust_app_session *ua_sess; | |
4519 | struct ust_app_channel *ua_chan; | |
4520 | struct ust_app_event *ua_event; | |
4521 | ||
4522 | DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid); | |
4523 | ||
4524 | rcu_read_lock(); | |
4525 | ||
4526 | app = ust_app_find_by_pid(pid); | |
4527 | if (app == NULL) { | |
4528 | ERR("UST app enable event per PID %d not found", pid); | |
4529 | ret = -1; | |
d0b96690 | 4530 | goto end; |
76d45b40 DG |
4531 | } |
4532 | ||
e0c7ec2b DG |
4533 | if (!app->compatible) { |
4534 | ret = 0; | |
d0b96690 | 4535 | goto end; |
e0c7ec2b DG |
4536 | } |
4537 | ||
76d45b40 | 4538 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4539 | if (!ua_sess) { |
4540 | /* The application has problem or is probably dead. */ | |
d0b96690 DG |
4541 | ret = 0; |
4542 | goto end; | |
c4a1715b | 4543 | } |
76d45b40 | 4544 | |
d0b96690 | 4545 | pthread_mutex_lock(&ua_sess->lock); |
76d45b40 | 4546 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4547 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4548 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
76d45b40 DG |
4549 | /* If the channel is not found, there is a code flow error */ |
4550 | assert(ua_chan_node); | |
4551 | ||
4552 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4553 | ||
18eace3b | 4554 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 4555 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 4556 | if (ua_event == NULL) { |
76d45b40 DG |
4557 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
4558 | if (ret < 0) { | |
d0b96690 | 4559 | goto end_unlock; |
76d45b40 DG |
4560 | } |
4561 | } else { | |
76d45b40 DG |
4562 | ret = enable_ust_app_event(ua_sess, ua_event, app); |
4563 | if (ret < 0) { | |
d0b96690 | 4564 | goto end_unlock; |
76d45b40 DG |
4565 | } |
4566 | } | |
4567 | ||
d0b96690 DG |
4568 | end_unlock: |
4569 | pthread_mutex_unlock(&ua_sess->lock); | |
4570 | end: | |
76d45b40 DG |
4571 | rcu_read_unlock(); |
4572 | return ret; | |
4573 | } | |
7f79d3a1 | 4574 | |
4466912f DG |
4575 | /* |
4576 | * Calibrate registered applications. | |
4577 | */ | |
4578 | int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate) | |
4579 | { | |
4580 | int ret = 0; | |
4581 | struct lttng_ht_iter iter; | |
4582 | struct ust_app *app; | |
4583 | ||
4584 | rcu_read_lock(); | |
4585 | ||
852d0037 | 4586 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4466912f DG |
4587 | if (!app->compatible) { |
4588 | /* | |
4589 | * TODO: In time, we should notice the caller of this error by | |
4590 | * telling him that this is a version error. | |
4591 | */ | |
4592 | continue; | |
4593 | } | |
4594 | ||
840cb59c | 4595 | health_code_update(); |
86acf0da | 4596 | |
852d0037 | 4597 | ret = ustctl_calibrate(app->sock, calibrate); |
4466912f DG |
4598 | if (ret < 0) { |
4599 | switch (ret) { | |
4600 | case -ENOSYS: | |
4601 | /* Means that it's not implemented on the tracer side. */ | |
4602 | ret = 0; | |
4603 | break; | |
4604 | default: | |
4466912f | 4605 | DBG2("Calibrate app PID %d returned with error %d", |
852d0037 | 4606 | app->pid, ret); |
4466912f DG |
4607 | break; |
4608 | } | |
4609 | } | |
4610 | } | |
4611 | ||
4612 | DBG("UST app global domain calibration finished"); | |
4613 | ||
4614 | rcu_read_unlock(); | |
4615 | ||
840cb59c | 4616 | health_code_update(); |
86acf0da | 4617 | |
4466912f DG |
4618 | return ret; |
4619 | } | |
d0b96690 DG |
4620 | |
4621 | /* | |
4622 | * Receive registration and populate the given msg structure. | |
4623 | * | |
4624 | * On success return 0 else a negative value returned by the ustctl call. | |
4625 | */ | |
4626 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
4627 | { | |
4628 | int ret; | |
4629 | uint32_t pid, ppid, uid, gid; | |
4630 | ||
4631 | assert(msg); | |
4632 | ||
4633 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
4634 | &pid, &ppid, &uid, &gid, | |
4635 | &msg->bits_per_long, | |
4636 | &msg->uint8_t_alignment, | |
4637 | &msg->uint16_t_alignment, | |
4638 | &msg->uint32_t_alignment, | |
4639 | &msg->uint64_t_alignment, | |
4640 | &msg->long_alignment, | |
4641 | &msg->byte_order, | |
4642 | msg->name); | |
4643 | if (ret < 0) { | |
4644 | switch (-ret) { | |
4645 | case EPIPE: | |
4646 | case ECONNRESET: | |
4647 | case LTTNG_UST_ERR_EXITING: | |
4648 | DBG3("UST app recv reg message failed. Application died"); | |
4649 | break; | |
4650 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
4651 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
4652 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
4653 | LTTNG_UST_ABI_MINOR_VERSION); | |
4654 | break; | |
4655 | default: | |
4656 | ERR("UST app recv reg message failed with ret %d", ret); | |
4657 | break; | |
4658 | } | |
4659 | goto error; | |
4660 | } | |
4661 | msg->pid = (pid_t) pid; | |
4662 | msg->ppid = (pid_t) ppid; | |
4663 | msg->uid = (uid_t) uid; | |
4664 | msg->gid = (gid_t) gid; | |
4665 | ||
4666 | error: | |
4667 | return ret; | |
4668 | } | |
4669 | ||
d88aee68 DG |
4670 | /* |
4671 | * Return a ust app channel object using the application object and the channel | |
4672 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
4673 | * lock MUST be acquired before calling this function. | |
4674 | */ | |
d0b96690 DG |
4675 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
4676 | int objd) | |
4677 | { | |
4678 | struct lttng_ht_node_ulong *node; | |
4679 | struct lttng_ht_iter iter; | |
4680 | struct ust_app_channel *ua_chan = NULL; | |
4681 | ||
4682 | assert(app); | |
4683 | ||
4684 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
4685 | node = lttng_ht_iter_get_node_ulong(&iter); | |
4686 | if (node == NULL) { | |
4687 | DBG2("UST app channel find by objd %d not found", objd); | |
4688 | goto error; | |
4689 | } | |
4690 | ||
4691 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
4692 | ||
4693 | error: | |
4694 | return ua_chan; | |
4695 | } | |
4696 | ||
d88aee68 DG |
4697 | /* |
4698 | * Reply to a register channel notification from an application on the notify | |
4699 | * socket. The channel metadata is also created. | |
4700 | * | |
4701 | * The session UST registry lock is acquired in this function. | |
4702 | * | |
4703 | * On success 0 is returned else a negative value. | |
4704 | */ | |
d0b96690 DG |
4705 | static int reply_ust_register_channel(int sock, int sobjd, int cobjd, |
4706 | size_t nr_fields, struct ustctl_field *fields) | |
4707 | { | |
4708 | int ret, ret_code = 0; | |
4709 | uint32_t chan_id, reg_count; | |
7972aab2 | 4710 | uint64_t chan_reg_key; |
d0b96690 DG |
4711 | enum ustctl_channel_header type; |
4712 | struct ust_app *app; | |
4713 | struct ust_app_channel *ua_chan; | |
4714 | struct ust_app_session *ua_sess; | |
7972aab2 | 4715 | struct ust_registry_session *registry; |
45893984 | 4716 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
4717 | |
4718 | rcu_read_lock(); | |
4719 | ||
4720 | /* Lookup application. If not found, there is a code flow error. */ | |
4721 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4722 | if (!app) { |
4723 | DBG("Application socket %d is being teardown. Abort event notify", | |
4724 | sock); | |
4725 | ret = 0; | |
d5d629b5 | 4726 | free(fields); |
d88aee68 DG |
4727 | goto error_rcu_unlock; |
4728 | } | |
d0b96690 | 4729 | |
4950b860 | 4730 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4731 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4732 | if (!ua_chan) { |
4733 | DBG("Application channel is being teardown. Abort event notify"); | |
4734 | ret = 0; | |
d5d629b5 | 4735 | free(fields); |
4950b860 MD |
4736 | goto error_rcu_unlock; |
4737 | } | |
4738 | ||
d0b96690 DG |
4739 | assert(ua_chan->session); |
4740 | ua_sess = ua_chan->session; | |
d0b96690 | 4741 | |
7972aab2 DG |
4742 | /* Get right session registry depending on the session buffer type. */ |
4743 | registry = get_session_registry(ua_sess); | |
4744 | assert(registry); | |
45893984 | 4745 | |
7972aab2 DG |
4746 | /* Depending on the buffer type, a different channel key is used. */ |
4747 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4748 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 4749 | } else { |
7972aab2 | 4750 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
4751 | } |
4752 | ||
7972aab2 DG |
4753 | pthread_mutex_lock(®istry->lock); |
4754 | ||
4755 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
4756 | assert(chan_reg); | |
4757 | ||
4758 | if (!chan_reg->register_done) { | |
4759 | reg_count = ust_registry_get_event_count(chan_reg); | |
4760 | if (reg_count < 31) { | |
4761 | type = USTCTL_CHANNEL_HEADER_COMPACT; | |
4762 | } else { | |
4763 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
4764 | } | |
4765 | ||
4766 | chan_reg->nr_ctx_fields = nr_fields; | |
4767 | chan_reg->ctx_fields = fields; | |
4768 | chan_reg->header_type = type; | |
d0b96690 | 4769 | } else { |
7972aab2 DG |
4770 | /* Get current already assigned values. */ |
4771 | type = chan_reg->header_type; | |
d5d629b5 DG |
4772 | free(fields); |
4773 | /* Set to NULL so the error path does not do a double free. */ | |
4774 | fields = NULL; | |
d0b96690 | 4775 | } |
7972aab2 DG |
4776 | /* Channel id is set during the object creation. */ |
4777 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
4778 | |
4779 | /* Append to metadata */ | |
7972aab2 DG |
4780 | if (!chan_reg->metadata_dumped) { |
4781 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
4782 | if (ret_code) { |
4783 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
4784 | goto reply; | |
4785 | } | |
4786 | } | |
4787 | ||
4788 | reply: | |
7972aab2 DG |
4789 | DBG3("UST app replying to register channel key %" PRIu64 |
4790 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
4791 | ret_code); | |
d0b96690 DG |
4792 | |
4793 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
4794 | if (ret < 0) { | |
4795 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4796 | ERR("UST app reply channel failed with ret %d", ret); | |
4797 | } else { | |
4798 | DBG3("UST app reply channel failed. Application died"); | |
4799 | } | |
4800 | goto error; | |
4801 | } | |
4802 | ||
7972aab2 DG |
4803 | /* This channel registry registration is completed. */ |
4804 | chan_reg->register_done = 1; | |
4805 | ||
d0b96690 | 4806 | error: |
7972aab2 | 4807 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4808 | error_rcu_unlock: |
d0b96690 | 4809 | rcu_read_unlock(); |
d5d629b5 DG |
4810 | if (ret) { |
4811 | free(fields); | |
4812 | } | |
d0b96690 DG |
4813 | return ret; |
4814 | } | |
4815 | ||
d88aee68 DG |
4816 | /* |
4817 | * Add event to the UST channel registry. When the event is added to the | |
4818 | * registry, the metadata is also created. Once done, this replies to the | |
4819 | * application with the appropriate error code. | |
4820 | * | |
4821 | * The session UST registry lock is acquired in the function. | |
4822 | * | |
4823 | * On success 0 is returned else a negative value. | |
4824 | */ | |
d0b96690 DG |
4825 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
4826 | char *sig, size_t nr_fields, struct ustctl_field *fields, int loglevel, | |
4827 | char *model_emf_uri) | |
4828 | { | |
4829 | int ret, ret_code; | |
4830 | uint32_t event_id = 0; | |
7972aab2 | 4831 | uint64_t chan_reg_key; |
d0b96690 DG |
4832 | struct ust_app *app; |
4833 | struct ust_app_channel *ua_chan; | |
4834 | struct ust_app_session *ua_sess; | |
7972aab2 | 4835 | struct ust_registry_session *registry; |
d0b96690 DG |
4836 | |
4837 | rcu_read_lock(); | |
4838 | ||
4839 | /* Lookup application. If not found, there is a code flow error. */ | |
4840 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4841 | if (!app) { |
4842 | DBG("Application socket %d is being teardown. Abort event notify", | |
4843 | sock); | |
4844 | ret = 0; | |
d5d629b5 DG |
4845 | free(sig); |
4846 | free(fields); | |
4847 | free(model_emf_uri); | |
d88aee68 DG |
4848 | goto error_rcu_unlock; |
4849 | } | |
d0b96690 | 4850 | |
4950b860 | 4851 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4852 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4853 | if (!ua_chan) { |
4854 | DBG("Application channel is being teardown. Abort event notify"); | |
4855 | ret = 0; | |
d5d629b5 DG |
4856 | free(sig); |
4857 | free(fields); | |
4858 | free(model_emf_uri); | |
4950b860 MD |
4859 | goto error_rcu_unlock; |
4860 | } | |
4861 | ||
d0b96690 DG |
4862 | assert(ua_chan->session); |
4863 | ua_sess = ua_chan->session; | |
4864 | ||
7972aab2 DG |
4865 | registry = get_session_registry(ua_sess); |
4866 | assert(registry); | |
4867 | ||
4868 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4869 | chan_reg_key = ua_chan->tracing_channel_id; | |
4870 | } else { | |
4871 | chan_reg_key = ua_chan->key; | |
4872 | } | |
4873 | ||
4874 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 4875 | |
d5d629b5 DG |
4876 | /* |
4877 | * From this point on, this call acquires the ownership of the sig, fields | |
4878 | * and model_emf_uri meaning any free are done inside it if needed. These | |
4879 | * three variables MUST NOT be read/write after this. | |
4880 | */ | |
7972aab2 | 4881 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
45893984 | 4882 | sobjd, cobjd, name, sig, nr_fields, fields, loglevel, |
8494bda5 MD |
4883 | model_emf_uri, ua_sess->buffer_type, &event_id, |
4884 | app); | |
d0b96690 DG |
4885 | |
4886 | /* | |
4887 | * The return value is returned to ustctl so in case of an error, the | |
4888 | * application can be notified. In case of an error, it's important not to | |
4889 | * return a negative error or else the application will get closed. | |
4890 | */ | |
4891 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
4892 | if (ret < 0) { | |
4893 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4894 | ERR("UST app reply event failed with ret %d", ret); | |
4895 | } else { | |
4896 | DBG3("UST app reply event failed. Application died"); | |
4897 | } | |
4898 | /* | |
4899 | * No need to wipe the create event since the application socket will | |
4900 | * get close on error hence cleaning up everything by itself. | |
4901 | */ | |
4902 | goto error; | |
4903 | } | |
4904 | ||
7972aab2 DG |
4905 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
4906 | name, event_id); | |
d88aee68 | 4907 | |
d0b96690 | 4908 | error: |
7972aab2 | 4909 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4910 | error_rcu_unlock: |
d0b96690 DG |
4911 | rcu_read_unlock(); |
4912 | return ret; | |
4913 | } | |
4914 | ||
d88aee68 DG |
4915 | /* |
4916 | * Handle application notification through the given notify socket. | |
4917 | * | |
4918 | * Return 0 on success or else a negative value. | |
4919 | */ | |
d0b96690 DG |
4920 | int ust_app_recv_notify(int sock) |
4921 | { | |
4922 | int ret; | |
4923 | enum ustctl_notify_cmd cmd; | |
4924 | ||
4925 | DBG3("UST app receiving notify from sock %d", sock); | |
4926 | ||
4927 | ret = ustctl_recv_notify(sock, &cmd); | |
4928 | if (ret < 0) { | |
4929 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4930 | ERR("UST app recv notify failed with ret %d", ret); | |
4931 | } else { | |
4932 | DBG3("UST app recv notify failed. Application died"); | |
4933 | } | |
4934 | goto error; | |
4935 | } | |
4936 | ||
4937 | switch (cmd) { | |
4938 | case USTCTL_NOTIFY_CMD_EVENT: | |
4939 | { | |
4940 | int sobjd, cobjd, loglevel; | |
4941 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; | |
4942 | size_t nr_fields; | |
4943 | struct ustctl_field *fields; | |
4944 | ||
4945 | DBG2("UST app ustctl register event received"); | |
4946 | ||
4947 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, &loglevel, | |
4948 | &sig, &nr_fields, &fields, &model_emf_uri); | |
4949 | if (ret < 0) { | |
4950 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4951 | ERR("UST app recv event failed with ret %d", ret); | |
4952 | } else { | |
4953 | DBG3("UST app recv event failed. Application died"); | |
4954 | } | |
4955 | goto error; | |
4956 | } | |
4957 | ||
d5d629b5 DG |
4958 | /* |
4959 | * Add event to the UST registry coming from the notify socket. This | |
4960 | * call will free if needed the sig, fields and model_emf_uri. This | |
4961 | * code path loses the ownsership of these variables and transfer them | |
4962 | * to the this function. | |
4963 | */ | |
d0b96690 DG |
4964 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
4965 | fields, loglevel, model_emf_uri); | |
4966 | if (ret < 0) { | |
4967 | goto error; | |
4968 | } | |
4969 | ||
4970 | break; | |
4971 | } | |
4972 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
4973 | { | |
4974 | int sobjd, cobjd; | |
4975 | size_t nr_fields; | |
4976 | struct ustctl_field *fields; | |
4977 | ||
4978 | DBG2("UST app ustctl register channel received"); | |
4979 | ||
4980 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
4981 | &fields); | |
4982 | if (ret < 0) { | |
4983 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4984 | ERR("UST app recv channel failed with ret %d", ret); | |
4985 | } else { | |
4986 | DBG3("UST app recv channel failed. Application died"); | |
4987 | } | |
4988 | goto error; | |
4989 | } | |
4990 | ||
d5d629b5 DG |
4991 | /* |
4992 | * The fields ownership are transfered to this function call meaning | |
4993 | * that if needed it will be freed. After this, it's invalid to access | |
4994 | * fields or clean it up. | |
4995 | */ | |
d0b96690 DG |
4996 | ret = reply_ust_register_channel(sock, sobjd, cobjd, nr_fields, |
4997 | fields); | |
4998 | if (ret < 0) { | |
4999 | goto error; | |
5000 | } | |
5001 | ||
5002 | break; | |
5003 | } | |
5004 | default: | |
5005 | /* Should NEVER happen. */ | |
5006 | assert(0); | |
5007 | } | |
5008 | ||
5009 | error: | |
5010 | return ret; | |
5011 | } | |
d88aee68 DG |
5012 | |
5013 | /* | |
5014 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
5015 | * corresponding application. On failure, the call_rcu to close the socket is | |
5016 | * executed. If an application is found, it tries to delete it from the notify | |
5017 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
5018 | * | |
5019 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
5020 | * call RCU is not done but the rest of the cleanup is. | |
5021 | */ | |
5022 | void ust_app_notify_sock_unregister(int sock) | |
5023 | { | |
5024 | int err_enomem = 0; | |
5025 | struct lttng_ht_iter iter; | |
5026 | struct ust_app *app; | |
5027 | struct ust_app_notify_sock_obj *obj; | |
5028 | ||
5029 | assert(sock >= 0); | |
5030 | ||
5031 | rcu_read_lock(); | |
5032 | ||
5033 | obj = zmalloc(sizeof(*obj)); | |
5034 | if (!obj) { | |
5035 | /* | |
5036 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
5037 | * procedure but the call_rcu will not be called. In this case, we | |
5038 | * accept the fd leak rather than possibly creating an unsynchronized | |
5039 | * state between threads. | |
5040 | * | |
5041 | * TODO: The notify object should be created once the notify socket is | |
5042 | * registered and stored independantely from the ust app object. The | |
5043 | * tricky part is to synchronize the teardown of the application and | |
5044 | * this notify object. Let's keep that in mind so we can avoid this | |
5045 | * kind of shenanigans with ENOMEM in the teardown path. | |
5046 | */ | |
5047 | err_enomem = 1; | |
5048 | } else { | |
5049 | obj->fd = sock; | |
5050 | } | |
5051 | ||
5052 | DBG("UST app notify socket unregister %d", sock); | |
5053 | ||
5054 | /* | |
5055 | * Lookup application by notify socket. If this fails, this means that the | |
5056 | * hash table delete has already been done by the application | |
5057 | * unregistration process so we can safely close the notify socket in a | |
5058 | * call RCU. | |
5059 | */ | |
5060 | app = find_app_by_notify_sock(sock); | |
5061 | if (!app) { | |
5062 | goto close_socket; | |
5063 | } | |
5064 | ||
5065 | iter.iter.node = &app->notify_sock_n.node; | |
5066 | ||
5067 | /* | |
5068 | * Whatever happens here either we fail or succeed, in both cases we have | |
5069 | * to close the socket after a grace period to continue to the call RCU | |
5070 | * here. If the deletion is successful, the application is not visible | |
5071 | * anymore by other threads and is it fails it means that it was already | |
5072 | * deleted from the hash table so either way we just have to close the | |
5073 | * socket. | |
5074 | */ | |
5075 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
5076 | ||
5077 | close_socket: | |
5078 | rcu_read_unlock(); | |
5079 | ||
5080 | /* | |
5081 | * Close socket after a grace period to avoid for the socket to be reused | |
5082 | * before the application object is freed creating potential race between | |
5083 | * threads trying to add unique in the global hash table. | |
5084 | */ | |
5085 | if (!err_enomem) { | |
5086 | call_rcu(&obj->head, close_notify_sock_rcu); | |
5087 | } | |
5088 | } | |
f45e313d DG |
5089 | |
5090 | /* | |
5091 | * Destroy a ust app data structure and free its memory. | |
5092 | */ | |
5093 | void ust_app_destroy(struct ust_app *app) | |
5094 | { | |
5095 | if (!app) { | |
5096 | return; | |
5097 | } | |
5098 | ||
5099 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
5100 | } | |
6dc3064a DG |
5101 | |
5102 | /* | |
5103 | * Take a snapshot for a given UST session. The snapshot is sent to the given | |
5104 | * output. | |
5105 | * | |
5106 | * Return 0 on success or else a negative value. | |
5107 | */ | |
5108 | int ust_app_snapshot_record(struct ltt_ust_session *usess, | |
d07ceecd MD |
5109 | struct snapshot_output *output, int wait, |
5110 | uint64_t nb_packets_per_stream) | |
6dc3064a DG |
5111 | { |
5112 | int ret = 0; | |
7badf927 | 5113 | unsigned int snapshot_done = 0; |
6dc3064a DG |
5114 | struct lttng_ht_iter iter; |
5115 | struct ust_app *app; | |
af706bb7 | 5116 | char pathname[PATH_MAX]; |
6dc3064a DG |
5117 | |
5118 | assert(usess); | |
5119 | assert(output); | |
5120 | ||
5121 | rcu_read_lock(); | |
5122 | ||
8c924c7b MD |
5123 | switch (usess->buffer_type) { |
5124 | case LTTNG_BUFFER_PER_UID: | |
5125 | { | |
5126 | struct buffer_reg_uid *reg; | |
6dc3064a | 5127 | |
8c924c7b MD |
5128 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
5129 | struct buffer_reg_channel *reg_chan; | |
5130 | struct consumer_socket *socket; | |
6dc3064a | 5131 | |
8c924c7b MD |
5132 | /* Get consumer socket to use to push the metadata.*/ |
5133 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
5134 | usess->consumer); | |
5135 | if (!socket) { | |
5136 | ret = -EINVAL; | |
5137 | goto error; | |
5138 | } | |
6dc3064a | 5139 | |
8c924c7b MD |
5140 | memset(pathname, 0, sizeof(pathname)); |
5141 | ret = snprintf(pathname, sizeof(pathname), | |
5142 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH, | |
5143 | reg->uid, reg->bits_per_long); | |
5144 | if (ret < 0) { | |
5145 | PERROR("snprintf snapshot path"); | |
5146 | goto error; | |
5147 | } | |
5148 | ||
5149 | /* Add the UST default trace dir to path. */ | |
5150 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
5151 | reg_chan, node.node) { | |
68808f4e DG |
5152 | ret = consumer_snapshot_channel(socket, reg_chan->consumer_key, |
5153 | output, 0, usess->uid, usess->gid, pathname, wait, | |
d07ceecd | 5154 | nb_packets_per_stream); |
8c924c7b MD |
5155 | if (ret < 0) { |
5156 | goto error; | |
5157 | } | |
5158 | } | |
68808f4e DG |
5159 | ret = consumer_snapshot_channel(socket, |
5160 | reg->registry->reg.ust->metadata_key, output, 1, | |
d07ceecd | 5161 | usess->uid, usess->gid, pathname, wait, 0); |
8c924c7b MD |
5162 | if (ret < 0) { |
5163 | goto error; | |
5164 | } | |
7badf927 | 5165 | snapshot_done = 1; |
af706bb7 | 5166 | } |
8c924c7b MD |
5167 | break; |
5168 | } | |
5169 | case LTTNG_BUFFER_PER_PID: | |
5170 | { | |
5171 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5172 | struct consumer_socket *socket; | |
5173 | struct lttng_ht_iter chan_iter; | |
5174 | struct ust_app_channel *ua_chan; | |
5175 | struct ust_app_session *ua_sess; | |
5176 | struct ust_registry_session *registry; | |
5177 | ||
5178 | ua_sess = lookup_session_by_app(usess, app); | |
5179 | if (!ua_sess) { | |
5180 | /* Session not associated with this app. */ | |
5181 | continue; | |
5182 | } | |
af706bb7 | 5183 | |
8c924c7b MD |
5184 | /* Get the right consumer socket for the application. */ |
5185 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
5186 | output->consumer); | |
5187 | if (!socket) { | |
5c786ded | 5188 | ret = -EINVAL; |
5c786ded JD |
5189 | goto error; |
5190 | } | |
5191 | ||
8c924c7b MD |
5192 | /* Add the UST default trace dir to path. */ |
5193 | memset(pathname, 0, sizeof(pathname)); | |
5194 | ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "/%s", | |
5195 | ua_sess->path); | |
6dc3064a | 5196 | if (ret < 0) { |
8c924c7b | 5197 | PERROR("snprintf snapshot path"); |
6dc3064a DG |
5198 | goto error; |
5199 | } | |
6dc3064a | 5200 | |
8c924c7b MD |
5201 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, |
5202 | ua_chan, node.node) { | |
68808f4e DG |
5203 | ret = consumer_snapshot_channel(socket, ua_chan->key, output, |
5204 | 0, ua_sess->euid, ua_sess->egid, pathname, wait, | |
d07ceecd | 5205 | nb_packets_per_stream); |
8c924c7b MD |
5206 | if (ret < 0) { |
5207 | goto error; | |
5208 | } | |
5209 | } | |
5210 | ||
5211 | registry = get_session_registry(ua_sess); | |
5212 | assert(registry); | |
5213 | ret = consumer_snapshot_channel(socket, registry->metadata_key, output, | |
d07ceecd | 5214 | 1, ua_sess->euid, ua_sess->egid, pathname, wait, 0); |
8c924c7b MD |
5215 | if (ret < 0) { |
5216 | goto error; | |
5217 | } | |
7badf927 | 5218 | snapshot_done = 1; |
8c924c7b MD |
5219 | } |
5220 | break; | |
5221 | } | |
5222 | default: | |
5223 | assert(0); | |
5224 | break; | |
6dc3064a DG |
5225 | } |
5226 | ||
7badf927 DG |
5227 | if (!snapshot_done) { |
5228 | /* | |
5229 | * If no snapshot was made and we are not in the error path, this means | |
5230 | * that there are no buffers thus no (prior) application to snapshot | |
5231 | * data from so we have simply NO data. | |
5232 | */ | |
5233 | ret = -ENODATA; | |
5234 | } | |
5235 | ||
6dc3064a DG |
5236 | error: |
5237 | rcu_read_unlock(); | |
5238 | return ret; | |
5239 | } | |
5c786ded JD |
5240 | |
5241 | /* | |
d07ceecd | 5242 | * Return the size taken by one more packet per stream. |
5c786ded | 5243 | */ |
d07ceecd MD |
5244 | uint64_t ust_app_get_size_one_more_packet_per_stream(struct ltt_ust_session *usess, |
5245 | uint64_t cur_nr_packets) | |
5c786ded | 5246 | { |
d07ceecd | 5247 | uint64_t tot_size = 0; |
5c786ded JD |
5248 | struct ust_app *app; |
5249 | struct lttng_ht_iter iter; | |
5250 | ||
5251 | assert(usess); | |
5252 | ||
5253 | switch (usess->buffer_type) { | |
5254 | case LTTNG_BUFFER_PER_UID: | |
5255 | { | |
5256 | struct buffer_reg_uid *reg; | |
5257 | ||
5258 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
5259 | struct buffer_reg_channel *reg_chan; | |
5260 | ||
b7064eaa | 5261 | rcu_read_lock(); |
5c786ded JD |
5262 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
5263 | reg_chan, node.node) { | |
d07ceecd MD |
5264 | if (cur_nr_packets >= reg_chan->num_subbuf) { |
5265 | /* | |
5266 | * Don't take channel into account if we | |
5267 | * already grab all its packets. | |
5268 | */ | |
5269 | continue; | |
5270 | } | |
5271 | tot_size += reg_chan->subbuf_size * reg_chan->stream_count; | |
5c786ded | 5272 | } |
b7064eaa | 5273 | rcu_read_unlock(); |
5c786ded JD |
5274 | } |
5275 | break; | |
5276 | } | |
5277 | case LTTNG_BUFFER_PER_PID: | |
5278 | { | |
5279 | rcu_read_lock(); | |
5280 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5281 | struct ust_app_channel *ua_chan; | |
5282 | struct ust_app_session *ua_sess; | |
5283 | struct lttng_ht_iter chan_iter; | |
5284 | ||
5285 | ua_sess = lookup_session_by_app(usess, app); | |
5286 | if (!ua_sess) { | |
5287 | /* Session not associated with this app. */ | |
5288 | continue; | |
5289 | } | |
5290 | ||
5291 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
5292 | ua_chan, node.node) { | |
d07ceecd MD |
5293 | if (cur_nr_packets >= ua_chan->attr.num_subbuf) { |
5294 | /* | |
5295 | * Don't take channel into account if we | |
5296 | * already grab all its packets. | |
5297 | */ | |
5298 | continue; | |
5299 | } | |
5300 | tot_size += ua_chan->attr.subbuf_size * ua_chan->streams.count; | |
5c786ded JD |
5301 | } |
5302 | } | |
5303 | rcu_read_unlock(); | |
5304 | break; | |
5305 | } | |
5306 | default: | |
5307 | assert(0); | |
5308 | break; | |
5309 | } | |
5310 | ||
d07ceecd | 5311 | return tot_size; |
5c786ded | 5312 | } |