Commit | Line | Data |
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91d76f53 DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * | |
d14d33bf AM |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License, version 2 only, | |
6 | * as published by the Free Software Foundation. | |
91d76f53 DG |
7 | * |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
d14d33bf AM |
13 | * You should have received a copy of the GNU General Public License along |
14 | * with this program; if not, write to the Free Software Foundation, Inc., | |
15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
91d76f53 DG |
16 | */ |
17 | ||
18 | #define _GNU_SOURCE | |
19 | #include <errno.h> | |
7972aab2 | 20 | #include <inttypes.h> |
91d76f53 DG |
21 | #include <pthread.h> |
22 | #include <stdio.h> | |
23 | #include <stdlib.h> | |
099e26bd | 24 | #include <string.h> |
aba8e916 DG |
25 | #include <sys/stat.h> |
26 | #include <sys/types.h> | |
099e26bd | 27 | #include <unistd.h> |
0df502fd | 28 | #include <urcu/compiler.h> |
fb54cdbf | 29 | #include <lttng/ust-error.h> |
bec39940 | 30 | |
990570ed | 31 | #include <common/common.h> |
86acf0da | 32 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 33 | |
7972aab2 | 34 | #include "buffer-registry.h" |
86acf0da DG |
35 | #include "fd-limit.h" |
36 | #include "health.h" | |
56fff090 | 37 | #include "ust-app.h" |
48842b30 | 38 | #include "ust-consumer.h" |
d80a6244 DG |
39 | #include "ust-ctl.h" |
40 | ||
ffe60014 DG |
41 | /* Next available channel key. */ |
42 | static unsigned long next_channel_key; | |
7972aab2 | 43 | static unsigned long next_session_id; |
ffe60014 DG |
44 | |
45 | /* | |
46 | * Return the atomically incremented value of next_channel_key. | |
47 | */ | |
48 | static inline unsigned long get_next_channel_key(void) | |
49 | { | |
50 | return uatomic_add_return(&next_channel_key, 1); | |
51 | } | |
52 | ||
53 | /* | |
7972aab2 | 54 | * Return the atomically incremented value of next_session_id. |
ffe60014 | 55 | */ |
7972aab2 | 56 | static inline unsigned long get_next_session_id(void) |
ffe60014 | 57 | { |
7972aab2 | 58 | return uatomic_add_return(&next_session_id, 1); |
ffe60014 DG |
59 | } |
60 | ||
d65d2de8 DG |
61 | static void copy_channel_attr_to_ustctl( |
62 | struct ustctl_consumer_channel_attr *attr, | |
63 | struct lttng_ust_channel_attr *uattr) | |
64 | { | |
65 | /* Copy event attributes since the layout is different. */ | |
66 | attr->subbuf_size = uattr->subbuf_size; | |
67 | attr->num_subbuf = uattr->num_subbuf; | |
68 | attr->overwrite = uattr->overwrite; | |
69 | attr->switch_timer_interval = uattr->switch_timer_interval; | |
70 | attr->read_timer_interval = uattr->read_timer_interval; | |
71 | attr->output = uattr->output; | |
72 | } | |
73 | ||
025faf73 DG |
74 | /* |
75 | * Match function for the hash table lookup. | |
76 | * | |
77 | * It matches an ust app event based on three attributes which are the event | |
78 | * name, the filter bytecode and the loglevel. | |
79 | */ | |
18eace3b DG |
80 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
81 | { | |
82 | struct ust_app_event *event; | |
83 | const struct ust_app_ht_key *key; | |
84 | ||
85 | assert(node); | |
86 | assert(_key); | |
87 | ||
88 | event = caa_container_of(node, struct ust_app_event, node.node); | |
89 | key = _key; | |
90 | ||
91 | /* Match the 3 elements of the key: name, filter and loglevel. */ | |
92 | ||
93 | /* Event name */ | |
94 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
95 | goto no_match; | |
96 | } | |
97 | ||
98 | /* Event loglevel. */ | |
99 | if (event->attr.loglevel != key->loglevel) { | |
025faf73 DG |
100 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
101 | && key->loglevel == 0 && event->attr.loglevel == -1) { | |
102 | /* | |
103 | * Match is accepted. This is because on event creation, the | |
104 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
105 | * -1 are accepted for this loglevel type since 0 is the one set by | |
106 | * the API when receiving an enable event. | |
107 | */ | |
108 | } else { | |
109 | goto no_match; | |
110 | } | |
18eace3b DG |
111 | } |
112 | ||
113 | /* One of the filters is NULL, fail. */ | |
114 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
115 | goto no_match; | |
116 | } | |
117 | ||
025faf73 DG |
118 | if (key->filter && event->filter) { |
119 | /* Both filters exists, check length followed by the bytecode. */ | |
120 | if (event->filter->len != key->filter->len || | |
121 | memcmp(event->filter->data, key->filter->data, | |
122 | event->filter->len) != 0) { | |
123 | goto no_match; | |
124 | } | |
18eace3b DG |
125 | } |
126 | ||
025faf73 | 127 | /* Match. */ |
18eace3b DG |
128 | return 1; |
129 | ||
130 | no_match: | |
131 | return 0; | |
18eace3b DG |
132 | } |
133 | ||
025faf73 DG |
134 | /* |
135 | * Unique add of an ust app event in the given ht. This uses the custom | |
136 | * ht_match_ust_app_event match function and the event name as hash. | |
137 | */ | |
d0b96690 | 138 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
139 | struct ust_app_event *event) |
140 | { | |
141 | struct cds_lfht_node *node_ptr; | |
142 | struct ust_app_ht_key key; | |
d0b96690 | 143 | struct lttng_ht *ht; |
18eace3b | 144 | |
d0b96690 DG |
145 | assert(ua_chan); |
146 | assert(ua_chan->events); | |
18eace3b DG |
147 | assert(event); |
148 | ||
d0b96690 | 149 | ht = ua_chan->events; |
18eace3b DG |
150 | key.name = event->attr.name; |
151 | key.filter = event->filter; | |
152 | key.loglevel = event->attr.loglevel; | |
153 | ||
154 | node_ptr = cds_lfht_add_unique(ht->ht, | |
155 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
156 | ht_match_ust_app_event, &key, &event->node.node); | |
157 | assert(node_ptr == &event->node.node); | |
158 | } | |
159 | ||
d88aee68 DG |
160 | /* |
161 | * Close the notify socket from the given RCU head object. This MUST be called | |
162 | * through a call_rcu(). | |
163 | */ | |
164 | static void close_notify_sock_rcu(struct rcu_head *head) | |
165 | { | |
166 | int ret; | |
167 | struct ust_app_notify_sock_obj *obj = | |
168 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
169 | ||
170 | /* Must have a valid fd here. */ | |
171 | assert(obj->fd >= 0); | |
172 | ||
173 | ret = close(obj->fd); | |
174 | if (ret) { | |
175 | ERR("close notify sock %d RCU", obj->fd); | |
176 | } | |
177 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
178 | ||
179 | free(obj); | |
180 | } | |
181 | ||
7972aab2 DG |
182 | /* |
183 | * Return the session registry according to the buffer type of the given | |
184 | * session. | |
185 | * | |
186 | * A registry per UID object MUST exists before calling this function or else | |
187 | * it assert() if not found. RCU read side lock must be acquired. | |
188 | */ | |
189 | static struct ust_registry_session *get_session_registry( | |
190 | struct ust_app_session *ua_sess) | |
191 | { | |
192 | struct ust_registry_session *registry = NULL; | |
193 | ||
194 | assert(ua_sess); | |
195 | ||
196 | switch (ua_sess->buffer_type) { | |
197 | case LTTNG_BUFFER_PER_PID: | |
198 | { | |
199 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
200 | if (!reg_pid) { | |
201 | goto error; | |
202 | } | |
203 | registry = reg_pid->registry->reg.ust; | |
204 | break; | |
205 | } | |
206 | case LTTNG_BUFFER_PER_UID: | |
207 | { | |
208 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
209 | ua_sess->tracing_id, ua_sess->bits_per_long, ua_sess->uid); | |
210 | if (!reg_uid) { | |
211 | goto error; | |
212 | } | |
213 | registry = reg_uid->registry->reg.ust; | |
214 | break; | |
215 | } | |
216 | default: | |
217 | assert(0); | |
218 | }; | |
219 | ||
220 | error: | |
221 | return registry; | |
222 | } | |
223 | ||
55cc08a6 DG |
224 | /* |
225 | * Delete ust context safely. RCU read lock must be held before calling | |
226 | * this function. | |
227 | */ | |
228 | static | |
229 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx) | |
230 | { | |
ffe60014 DG |
231 | int ret; |
232 | ||
233 | assert(ua_ctx); | |
234 | ||
55cc08a6 | 235 | if (ua_ctx->obj) { |
ffe60014 | 236 | ret = ustctl_release_object(sock, ua_ctx->obj); |
d0b96690 DG |
237 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
238 | ERR("UST app sock %d release ctx obj handle %d failed with ret %d", | |
239 | sock, ua_ctx->obj->handle, ret); | |
ffe60014 | 240 | } |
55cc08a6 DG |
241 | free(ua_ctx->obj); |
242 | } | |
243 | free(ua_ctx); | |
244 | } | |
245 | ||
d80a6244 DG |
246 | /* |
247 | * Delete ust app event safely. RCU read lock must be held before calling | |
248 | * this function. | |
249 | */ | |
8b366481 DG |
250 | static |
251 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event) | |
d80a6244 | 252 | { |
ffe60014 DG |
253 | int ret; |
254 | ||
255 | assert(ua_event); | |
256 | ||
53a80697 | 257 | free(ua_event->filter); |
d80a6244 | 258 | |
edb67388 | 259 | if (ua_event->obj != NULL) { |
ffe60014 DG |
260 | ret = ustctl_release_object(sock, ua_event->obj); |
261 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
262 | ERR("UST app sock %d release event obj failed with ret %d", | |
263 | sock, ret); | |
264 | } | |
edb67388 DG |
265 | free(ua_event->obj); |
266 | } | |
d80a6244 DG |
267 | free(ua_event); |
268 | } | |
269 | ||
270 | /* | |
7972aab2 DG |
271 | * Release ust data object of the given stream. |
272 | * | |
273 | * Return 0 on success or else a negative value. | |
d80a6244 | 274 | */ |
7972aab2 | 275 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream) |
d80a6244 | 276 | { |
7972aab2 | 277 | int ret = 0; |
ffe60014 DG |
278 | |
279 | assert(stream); | |
280 | ||
8b366481 | 281 | if (stream->obj) { |
ffe60014 DG |
282 | ret = ustctl_release_object(sock, stream->obj); |
283 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
284 | ERR("UST app sock %d release stream obj failed with ret %d", | |
285 | sock, ret); | |
286 | } | |
4063050c | 287 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
288 | free(stream->obj); |
289 | } | |
7972aab2 DG |
290 | |
291 | return ret; | |
292 | } | |
293 | ||
294 | /* | |
295 | * Delete ust app stream safely. RCU read lock must be held before calling | |
296 | * this function. | |
297 | */ | |
298 | static | |
299 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream) | |
300 | { | |
301 | assert(stream); | |
302 | ||
303 | (void) release_ust_app_stream(sock, stream); | |
84cd17c6 | 304 | free(stream); |
d80a6244 DG |
305 | } |
306 | ||
307 | /* | |
308 | * Delete ust app channel safely. RCU read lock must be held before calling | |
309 | * this function. | |
310 | */ | |
8b366481 | 311 | static |
d0b96690 DG |
312 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
313 | struct ust_app *app) | |
d80a6244 DG |
314 | { |
315 | int ret; | |
bec39940 | 316 | struct lttng_ht_iter iter; |
d80a6244 | 317 | struct ust_app_event *ua_event; |
55cc08a6 | 318 | struct ust_app_ctx *ua_ctx; |
030a66fa | 319 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 320 | struct ust_registry_session *registry; |
d80a6244 | 321 | |
ffe60014 DG |
322 | assert(ua_chan); |
323 | ||
324 | DBG3("UST app deleting channel %s", ua_chan->name); | |
325 | ||
55cc08a6 | 326 | /* Wipe stream */ |
d80a6244 | 327 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 328 | cds_list_del(&stream->list); |
d80a6244 DG |
329 | delete_ust_app_stream(sock, stream); |
330 | } | |
331 | ||
55cc08a6 | 332 | /* Wipe context */ |
bec39940 DG |
333 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
334 | ret = lttng_ht_del(ua_chan->ctx, &iter); | |
55cc08a6 DG |
335 | assert(!ret); |
336 | delete_ust_app_ctx(sock, ua_ctx); | |
337 | } | |
bec39940 | 338 | lttng_ht_destroy(ua_chan->ctx); |
d80a6244 | 339 | |
55cc08a6 | 340 | /* Wipe events */ |
bec39940 DG |
341 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
342 | node.node) { | |
343 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 344 | assert(!ret); |
d80a6244 DG |
345 | delete_ust_app_event(sock, ua_event); |
346 | } | |
bec39940 | 347 | lttng_ht_destroy(ua_chan->events); |
edb67388 | 348 | |
45893984 | 349 | /* Wipe and free registry from session registry. */ |
7972aab2 DG |
350 | registry = get_session_registry(ua_chan->session); |
351 | if (registry) { | |
352 | ust_registry_channel_del_free(registry, ua_chan->key); | |
353 | } | |
d0b96690 | 354 | |
edb67388 | 355 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
356 | /* Remove channel from application UST object descriptor. */ |
357 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
358 | lttng_ht_del(app->ust_objd, &iter); | |
ffe60014 DG |
359 | ret = ustctl_release_object(sock, ua_chan->obj); |
360 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
361 | ERR("UST app sock %d release channel obj failed with ret %d", | |
362 | sock, ret); | |
363 | } | |
7972aab2 | 364 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
365 | free(ua_chan->obj); |
366 | } | |
84cd17c6 | 367 | free(ua_chan); |
d80a6244 DG |
368 | } |
369 | ||
d88aee68 DG |
370 | /* |
371 | * For a given application and session, push metadata to consumer. The session | |
372 | * lock MUST be acquired here before calling this. | |
373 | * | |
374 | * Return 0 on success else a negative error. | |
375 | */ | |
7972aab2 DG |
376 | static int push_metadata(struct ust_registry_session *registry, |
377 | struct consumer_output *consumer) | |
d88aee68 DG |
378 | { |
379 | int ret; | |
380 | char *metadata_str = NULL; | |
381 | size_t len, offset; | |
382 | struct consumer_socket *socket; | |
383 | ||
7972aab2 DG |
384 | assert(registry); |
385 | assert(consumer); | |
386 | ||
387 | rcu_read_lock(); | |
d88aee68 | 388 | |
7972aab2 DG |
389 | /* |
390 | * Means that no metadata was assigned to the session. This can happens if | |
391 | * no start has been done previously. | |
392 | */ | |
393 | if (!registry->metadata_key) { | |
d88aee68 | 394 | ret = 0; |
7972aab2 | 395 | goto error_rcu_unlock; |
d88aee68 DG |
396 | } |
397 | ||
d88aee68 | 398 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
399 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
400 | consumer); | |
d88aee68 DG |
401 | if (!socket) { |
402 | ret = -1; | |
403 | goto error_rcu_unlock; | |
404 | } | |
405 | ||
406 | /* | |
407 | * TODO: Currently, we hold the socket lock around sampling of the next | |
408 | * metadata segment to ensure we send metadata over the consumer socket in | |
409 | * the correct order. This makes the registry lock nest inside the socket | |
410 | * lock. | |
411 | * | |
412 | * Please note that this is a temporary measure: we should move this lock | |
413 | * back into ust_consumer_push_metadata() when the consumer gets the | |
414 | * ability to reorder the metadata it receives. | |
415 | */ | |
416 | pthread_mutex_lock(socket->lock); | |
7972aab2 | 417 | pthread_mutex_lock(®istry->lock); |
d88aee68 | 418 | |
7972aab2 DG |
419 | offset = registry->metadata_len_sent; |
420 | len = registry->metadata_len - registry->metadata_len_sent; | |
d88aee68 | 421 | if (len == 0) { |
7972aab2 DG |
422 | DBG3("No metadata to push for metadata key %" PRIu64, |
423 | registry->metadata_key); | |
d88aee68 DG |
424 | ret = 0; |
425 | goto error_reg_unlock; | |
426 | } | |
427 | assert(len > 0); | |
428 | ||
429 | /* Allocate only what we have to send. */ | |
430 | metadata_str = zmalloc(len); | |
431 | if (!metadata_str) { | |
432 | PERROR("zmalloc ust app metadata string"); | |
433 | ret = -ENOMEM; | |
434 | goto error_reg_unlock; | |
435 | } | |
436 | /* Copy what we haven't send out. */ | |
7972aab2 | 437 | memcpy(metadata_str, registry->metadata + offset, len); |
d88aee68 | 438 | |
7972aab2 | 439 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 440 | |
7972aab2 DG |
441 | ret = consumer_push_metadata(socket, registry->metadata_key, |
442 | metadata_str, len, offset); | |
d88aee68 DG |
443 | if (ret < 0) { |
444 | pthread_mutex_unlock(socket->lock); | |
445 | goto error_rcu_unlock; | |
446 | } | |
447 | ||
448 | /* Update len sent of the registry. */ | |
7972aab2 DG |
449 | pthread_mutex_lock(®istry->lock); |
450 | registry->metadata_len_sent += len; | |
451 | pthread_mutex_unlock(®istry->lock); | |
d88aee68 DG |
452 | pthread_mutex_unlock(socket->lock); |
453 | ||
454 | rcu_read_unlock(); | |
455 | free(metadata_str); | |
456 | return 0; | |
457 | ||
458 | error_reg_unlock: | |
7972aab2 | 459 | pthread_mutex_unlock(®istry->lock); |
d88aee68 DG |
460 | pthread_mutex_unlock(socket->lock); |
461 | error_rcu_unlock: | |
462 | rcu_read_unlock(); | |
463 | free(metadata_str); | |
d88aee68 DG |
464 | return ret; |
465 | } | |
466 | ||
467 | /* | |
468 | * Send to the consumer a close metadata command for the given session. Once | |
469 | * done, the metadata channel is deleted and the session metadata pointer is | |
470 | * nullified. The session lock MUST be acquired here unless the application is | |
471 | * in the destroy path. | |
472 | * | |
473 | * Return 0 on success else a negative value. | |
474 | */ | |
7972aab2 DG |
475 | static int close_metadata(struct ust_registry_session *registry, |
476 | struct consumer_output *consumer) | |
d88aee68 DG |
477 | { |
478 | int ret; | |
479 | struct consumer_socket *socket; | |
480 | ||
7972aab2 DG |
481 | assert(registry); |
482 | assert(consumer); | |
d88aee68 | 483 | |
7972aab2 DG |
484 | rcu_read_lock(); |
485 | ||
486 | if (!registry->metadata_key || registry->metadata_closed) { | |
d88aee68 DG |
487 | ret = 0; |
488 | goto error; | |
489 | } | |
490 | ||
d88aee68 | 491 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
492 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
493 | consumer); | |
d88aee68 DG |
494 | if (!socket) { |
495 | ret = -1; | |
7972aab2 | 496 | goto error; |
d88aee68 DG |
497 | } |
498 | ||
7972aab2 | 499 | ret = consumer_close_metadata(socket, registry->metadata_key); |
d88aee68 | 500 | if (ret < 0) { |
7972aab2 | 501 | goto error; |
d88aee68 DG |
502 | } |
503 | ||
7972aab2 DG |
504 | /* Metadata successfully closed. Flag the registry. */ |
505 | registry->metadata_closed = 1; | |
d88aee68 | 506 | |
d88aee68 | 507 | error: |
7972aab2 | 508 | rcu_read_unlock(); |
d88aee68 DG |
509 | return ret; |
510 | } | |
511 | ||
d80a6244 DG |
512 | /* |
513 | * Delete ust app session safely. RCU read lock must be held before calling | |
514 | * this function. | |
515 | */ | |
8b366481 | 516 | static |
d0b96690 DG |
517 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
518 | struct ust_app *app) | |
d80a6244 DG |
519 | { |
520 | int ret; | |
bec39940 | 521 | struct lttng_ht_iter iter; |
d80a6244 | 522 | struct ust_app_channel *ua_chan; |
7972aab2 | 523 | struct ust_registry_session *registry; |
d80a6244 | 524 | |
d88aee68 DG |
525 | assert(ua_sess); |
526 | ||
7972aab2 DG |
527 | registry = get_session_registry(ua_sess); |
528 | if (registry) { | |
d88aee68 | 529 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 530 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 531 | |
7972aab2 DG |
532 | /* |
533 | * Don't ask to close metadata for global per UID buffers. Close | |
534 | * metadata only on destroy trace session in this case. | |
535 | */ | |
536 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { | |
537 | /* And ask to close it for this session registry. */ | |
538 | (void) close_metadata(registry, ua_sess->consumer); | |
539 | } | |
d80a6244 DG |
540 | } |
541 | ||
bec39940 DG |
542 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
543 | node.node) { | |
544 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 545 | assert(!ret); |
d0b96690 | 546 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 547 | } |
bec39940 | 548 | lttng_ht_destroy(ua_sess->channels); |
d80a6244 | 549 | |
7972aab2 DG |
550 | /* In case of per PID, the registry is kept in the session. */ |
551 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
552 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
553 | if (reg_pid) { | |
554 | buffer_reg_pid_remove(reg_pid); | |
555 | buffer_reg_pid_destroy(reg_pid); | |
556 | } | |
557 | } | |
d0b96690 | 558 | |
aee6bafd | 559 | if (ua_sess->handle != -1) { |
ffe60014 DG |
560 | ret = ustctl_release_handle(sock, ua_sess->handle); |
561 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
562 | ERR("UST app sock %d release session handle failed with ret %d", | |
563 | sock, ret); | |
564 | } | |
aee6bafd | 565 | } |
8b366481 | 566 | free(ua_sess); |
d80a6244 | 567 | } |
91d76f53 DG |
568 | |
569 | /* | |
284d8f55 DG |
570 | * Delete a traceable application structure from the global list. Never call |
571 | * this function outside of a call_rcu call. | |
91d76f53 | 572 | */ |
8b366481 DG |
573 | static |
574 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 575 | { |
8b366481 | 576 | int ret, sock; |
d42f20df | 577 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 578 | |
f6a9efaa | 579 | rcu_read_lock(); |
44d3bd01 | 580 | |
d80a6244 | 581 | /* Delete ust app sessions info */ |
852d0037 DG |
582 | sock = app->sock; |
583 | app->sock = -1; | |
d80a6244 | 584 | |
d42f20df DG |
585 | lttng_ht_destroy(app->sessions); |
586 | ||
8b366481 | 587 | /* Wipe sessions */ |
d42f20df DG |
588 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
589 | teardown_node) { | |
590 | /* Free every object in the session and the session. */ | |
d0b96690 | 591 | delete_ust_app_session(sock, ua_sess, app); |
d80a6244 | 592 | } |
7972aab2 | 593 | lttng_ht_destroy(app->ust_objd); |
d80a6244 | 594 | |
6414a713 | 595 | /* |
852d0037 DG |
596 | * Wait until we have deleted the application from the sock hash table |
597 | * before closing this socket, otherwise an application could re-use the | |
598 | * socket ID and race with the teardown, using the same hash table entry. | |
599 | * | |
600 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
601 | * all RCU readers that could run concurrently with unregister app, | |
602 | * therefore we _need_ to only close that socket after a grace period. So | |
603 | * it should stay in this RCU callback. | |
604 | * | |
605 | * This close() is a very important step of the synchronization model so | |
606 | * every modification to this function must be carefully reviewed. | |
6414a713 | 607 | */ |
799e2c4f MD |
608 | ret = close(sock); |
609 | if (ret) { | |
610 | PERROR("close"); | |
611 | } | |
4063050c | 612 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 613 | |
852d0037 | 614 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 615 | free(app); |
bec39940 | 616 | |
f6a9efaa | 617 | rcu_read_unlock(); |
099e26bd DG |
618 | } |
619 | ||
620 | /* | |
f6a9efaa | 621 | * URCU intermediate call to delete an UST app. |
099e26bd | 622 | */ |
8b366481 DG |
623 | static |
624 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 625 | { |
bec39940 DG |
626 | struct lttng_ht_node_ulong *node = |
627 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 628 | struct ust_app *app = |
852d0037 | 629 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 630 | |
852d0037 | 631 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 632 | delete_ust_app(app); |
099e26bd DG |
633 | } |
634 | ||
ffe60014 DG |
635 | /* |
636 | * Delete the session from the application ht and delete the data structure by | |
637 | * freeing every object inside and releasing them. | |
638 | */ | |
d0b96690 | 639 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
640 | struct ust_app_session *ua_sess) |
641 | { | |
642 | int ret; | |
643 | struct lttng_ht_iter iter; | |
644 | ||
645 | assert(app); | |
646 | assert(ua_sess); | |
647 | ||
648 | iter.iter.node = &ua_sess->node.node; | |
649 | ret = lttng_ht_del(app->sessions, &iter); | |
650 | if (ret) { | |
651 | /* Already scheduled for teardown. */ | |
652 | goto end; | |
653 | } | |
654 | ||
655 | /* Once deleted, free the data structure. */ | |
d0b96690 | 656 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
657 | |
658 | end: | |
659 | return; | |
660 | } | |
661 | ||
8b366481 DG |
662 | /* |
663 | * Alloc new UST app session. | |
664 | */ | |
665 | static | |
d0b96690 | 666 | struct ust_app_session *alloc_ust_app_session(struct ust_app *app) |
8b366481 DG |
667 | { |
668 | struct ust_app_session *ua_sess; | |
669 | ||
670 | /* Init most of the default value by allocating and zeroing */ | |
671 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
672 | if (ua_sess == NULL) { | |
673 | PERROR("malloc"); | |
ffe60014 | 674 | goto error_free; |
8b366481 DG |
675 | } |
676 | ||
677 | ua_sess->handle = -1; | |
bec39940 | 678 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
d0b96690 | 679 | pthread_mutex_init(&ua_sess->lock, NULL); |
ffe60014 | 680 | |
8b366481 DG |
681 | return ua_sess; |
682 | ||
ffe60014 | 683 | error_free: |
8b366481 DG |
684 | return NULL; |
685 | } | |
686 | ||
687 | /* | |
688 | * Alloc new UST app channel. | |
689 | */ | |
690 | static | |
691 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 692 | struct ust_app_session *ua_sess, |
ffe60014 | 693 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
694 | { |
695 | struct ust_app_channel *ua_chan; | |
696 | ||
697 | /* Init most of the default value by allocating and zeroing */ | |
698 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
699 | if (ua_chan == NULL) { | |
700 | PERROR("malloc"); | |
701 | goto error; | |
702 | } | |
703 | ||
704 | /* Setup channel name */ | |
705 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
706 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
707 | ||
708 | ua_chan->enabled = 1; | |
709 | ua_chan->handle = -1; | |
45893984 | 710 | ua_chan->session = ua_sess; |
ffe60014 | 711 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
712 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
713 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
714 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
715 | |
716 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
717 | ||
718 | /* Copy attributes */ | |
719 | if (attr) { | |
ffe60014 | 720 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
721 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
722 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
723 | ua_chan->attr.overwrite = attr->overwrite; | |
724 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
725 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
726 | ua_chan->attr.output = attr->output; | |
8b366481 | 727 | } |
ffe60014 DG |
728 | /* By default, the channel is a per cpu channel. */ |
729 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
730 | |
731 | DBG3("UST app channel %s allocated", ua_chan->name); | |
732 | ||
733 | return ua_chan; | |
734 | ||
735 | error: | |
736 | return NULL; | |
737 | } | |
738 | ||
37f1c236 DG |
739 | /* |
740 | * Allocate and initialize a UST app stream. | |
741 | * | |
742 | * Return newly allocated stream pointer or NULL on error. | |
743 | */ | |
ffe60014 | 744 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
745 | { |
746 | struct ust_app_stream *stream = NULL; | |
747 | ||
748 | stream = zmalloc(sizeof(*stream)); | |
749 | if (stream == NULL) { | |
750 | PERROR("zmalloc ust app stream"); | |
751 | goto error; | |
752 | } | |
753 | ||
754 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
755 | stream->handle = -1; | |
756 | ||
757 | error: | |
758 | return stream; | |
759 | } | |
760 | ||
8b366481 DG |
761 | /* |
762 | * Alloc new UST app event. | |
763 | */ | |
764 | static | |
765 | struct ust_app_event *alloc_ust_app_event(char *name, | |
766 | struct lttng_ust_event *attr) | |
767 | { | |
768 | struct ust_app_event *ua_event; | |
769 | ||
770 | /* Init most of the default value by allocating and zeroing */ | |
771 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
772 | if (ua_event == NULL) { | |
773 | PERROR("malloc"); | |
774 | goto error; | |
775 | } | |
776 | ||
777 | ua_event->enabled = 1; | |
778 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
779 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 780 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
781 | |
782 | /* Copy attributes */ | |
783 | if (attr) { | |
784 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
785 | } | |
786 | ||
787 | DBG3("UST app event %s allocated", ua_event->name); | |
788 | ||
789 | return ua_event; | |
790 | ||
791 | error: | |
792 | return NULL; | |
793 | } | |
794 | ||
795 | /* | |
796 | * Alloc new UST app context. | |
797 | */ | |
798 | static | |
799 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx) | |
800 | { | |
801 | struct ust_app_ctx *ua_ctx; | |
802 | ||
803 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
804 | if (ua_ctx == NULL) { | |
805 | goto error; | |
806 | } | |
807 | ||
808 | if (uctx) { | |
809 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
810 | } | |
811 | ||
812 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
813 | ||
814 | error: | |
815 | return ua_ctx; | |
816 | } | |
817 | ||
025faf73 DG |
818 | /* |
819 | * Allocate a filter and copy the given original filter. | |
820 | * | |
821 | * Return allocated filter or NULL on error. | |
822 | */ | |
823 | static struct lttng_ust_filter_bytecode *alloc_copy_ust_app_filter( | |
824 | struct lttng_ust_filter_bytecode *orig_f) | |
825 | { | |
826 | struct lttng_ust_filter_bytecode *filter = NULL; | |
827 | ||
828 | /* Copy filter bytecode */ | |
829 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
830 | if (!filter) { | |
831 | PERROR("zmalloc alloc ust app filter"); | |
832 | goto error; | |
833 | } | |
834 | ||
835 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
836 | ||
837 | error: | |
838 | return filter; | |
839 | } | |
840 | ||
099e26bd | 841 | /* |
421cb601 DG |
842 | * Find an ust_app using the sock and return it. RCU read side lock must be |
843 | * held before calling this helper function. | |
099e26bd | 844 | */ |
8b366481 DG |
845 | static |
846 | struct ust_app *find_app_by_sock(int sock) | |
099e26bd | 847 | { |
bec39940 | 848 | struct lttng_ht_node_ulong *node; |
bec39940 | 849 | struct lttng_ht_iter iter; |
f6a9efaa | 850 | |
852d0037 | 851 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 852 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
853 | if (node == NULL) { |
854 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
855 | goto error; |
856 | } | |
852d0037 DG |
857 | |
858 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
859 | |
860 | error: | |
861 | return NULL; | |
099e26bd DG |
862 | } |
863 | ||
d0b96690 DG |
864 | /* |
865 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
866 | * be held before calling this helper function. | |
867 | */ | |
868 | static struct ust_app *find_app_by_notify_sock(int sock) | |
869 | { | |
870 | struct lttng_ht_node_ulong *node; | |
871 | struct lttng_ht_iter iter; | |
872 | ||
873 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
874 | &iter); | |
875 | node = lttng_ht_iter_get_node_ulong(&iter); | |
876 | if (node == NULL) { | |
877 | DBG2("UST app find by notify sock %d not found", sock); | |
878 | goto error; | |
879 | } | |
880 | ||
881 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
882 | ||
883 | error: | |
884 | return NULL; | |
885 | } | |
886 | ||
025faf73 DG |
887 | /* |
888 | * Lookup for an ust app event based on event name, filter bytecode and the | |
889 | * event loglevel. | |
890 | * | |
891 | * Return an ust_app_event object or NULL on error. | |
892 | */ | |
18eace3b DG |
893 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
894 | char *name, struct lttng_ust_filter_bytecode *filter, int loglevel) | |
895 | { | |
896 | struct lttng_ht_iter iter; | |
897 | struct lttng_ht_node_str *node; | |
898 | struct ust_app_event *event = NULL; | |
899 | struct ust_app_ht_key key; | |
18eace3b DG |
900 | |
901 | assert(name); | |
902 | assert(ht); | |
903 | ||
904 | /* Setup key for event lookup. */ | |
905 | key.name = name; | |
906 | key.filter = filter; | |
907 | key.loglevel = loglevel; | |
908 | ||
025faf73 DG |
909 | /* Lookup using the event name as hash and a custom match fct. */ |
910 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
911 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
912 | node = lttng_ht_iter_get_node_str(&iter); |
913 | if (node == NULL) { | |
914 | goto end; | |
915 | } | |
916 | ||
917 | event = caa_container_of(node, struct ust_app_event, node); | |
918 | ||
919 | end: | |
18eace3b DG |
920 | return event; |
921 | } | |
922 | ||
55cc08a6 DG |
923 | /* |
924 | * Create the channel context on the tracer. | |
d0b96690 DG |
925 | * |
926 | * Called with UST app session lock held. | |
55cc08a6 DG |
927 | */ |
928 | static | |
929 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
930 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
931 | { | |
932 | int ret; | |
933 | ||
840cb59c | 934 | health_code_update(); |
86acf0da | 935 | |
852d0037 | 936 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 DG |
937 | ua_chan->obj, &ua_ctx->obj); |
938 | if (ret < 0) { | |
ffe60014 DG |
939 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
940 | ERR("UST app create channel context failed for app (pid: %d) " | |
941 | "with ret %d", app->pid, ret); | |
942 | } else { | |
943 | DBG3("UST app disable event failed. Application is dead."); | |
944 | } | |
55cc08a6 DG |
945 | goto error; |
946 | } | |
947 | ||
948 | ua_ctx->handle = ua_ctx->obj->handle; | |
949 | ||
d0b96690 DG |
950 | DBG2("UST app context handle %d created successfully for channel %s", |
951 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
952 | |
953 | error: | |
840cb59c | 954 | health_code_update(); |
55cc08a6 DG |
955 | return ret; |
956 | } | |
957 | ||
53a80697 MD |
958 | /* |
959 | * Set the filter on the tracer. | |
960 | */ | |
961 | static | |
962 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
963 | struct ust_app *app) | |
964 | { | |
965 | int ret; | |
966 | ||
840cb59c | 967 | health_code_update(); |
86acf0da | 968 | |
53a80697 | 969 | if (!ua_event->filter) { |
86acf0da DG |
970 | ret = 0; |
971 | goto error; | |
53a80697 MD |
972 | } |
973 | ||
974 | ret = ustctl_set_filter(app->sock, ua_event->filter, | |
975 | ua_event->obj); | |
976 | if (ret < 0) { | |
ffe60014 DG |
977 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
978 | ERR("UST app event %s filter failed for app (pid: %d) " | |
979 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
980 | } else { | |
981 | DBG3("UST app filter event failed. Application is dead."); | |
982 | } | |
53a80697 MD |
983 | goto error; |
984 | } | |
985 | ||
986 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
987 | ||
988 | error: | |
840cb59c | 989 | health_code_update(); |
53a80697 MD |
990 | return ret; |
991 | } | |
992 | ||
9730260e DG |
993 | /* |
994 | * Disable the specified event on to UST tracer for the UST session. | |
995 | */ | |
996 | static int disable_ust_event(struct ust_app *app, | |
997 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
998 | { | |
999 | int ret; | |
1000 | ||
840cb59c | 1001 | health_code_update(); |
86acf0da | 1002 | |
852d0037 | 1003 | ret = ustctl_disable(app->sock, ua_event->obj); |
9730260e | 1004 | if (ret < 0) { |
ffe60014 DG |
1005 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1006 | ERR("UST app event %s disable failed for app (pid: %d) " | |
1007 | "and session handle %d with ret %d", | |
1008 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1009 | } else { | |
1010 | DBG3("UST app disable event failed. Application is dead."); | |
1011 | } | |
9730260e DG |
1012 | goto error; |
1013 | } | |
1014 | ||
1015 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 1016 | ua_event->attr.name, app->pid); |
9730260e DG |
1017 | |
1018 | error: | |
840cb59c | 1019 | health_code_update(); |
9730260e DG |
1020 | return ret; |
1021 | } | |
1022 | ||
78f0bacd DG |
1023 | /* |
1024 | * Disable the specified channel on to UST tracer for the UST session. | |
1025 | */ | |
1026 | static int disable_ust_channel(struct ust_app *app, | |
1027 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1028 | { | |
1029 | int ret; | |
1030 | ||
840cb59c | 1031 | health_code_update(); |
86acf0da | 1032 | |
852d0037 | 1033 | ret = ustctl_disable(app->sock, ua_chan->obj); |
78f0bacd | 1034 | if (ret < 0) { |
ffe60014 DG |
1035 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1036 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1037 | "and session handle %d with ret %d", | |
1038 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1039 | } else { | |
1040 | DBG3("UST app disable channel failed. Application is dead."); | |
1041 | } | |
78f0bacd DG |
1042 | goto error; |
1043 | } | |
1044 | ||
78f0bacd | 1045 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1046 | ua_chan->name, app->pid); |
78f0bacd DG |
1047 | |
1048 | error: | |
840cb59c | 1049 | health_code_update(); |
78f0bacd DG |
1050 | return ret; |
1051 | } | |
1052 | ||
1053 | /* | |
1054 | * Enable the specified channel on to UST tracer for the UST session. | |
1055 | */ | |
1056 | static int enable_ust_channel(struct ust_app *app, | |
1057 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1058 | { | |
1059 | int ret; | |
1060 | ||
840cb59c | 1061 | health_code_update(); |
86acf0da | 1062 | |
852d0037 | 1063 | ret = ustctl_enable(app->sock, ua_chan->obj); |
78f0bacd | 1064 | if (ret < 0) { |
ffe60014 DG |
1065 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1066 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1067 | "and session handle %d with ret %d", | |
1068 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1069 | } else { | |
1070 | DBG3("UST app enable channel failed. Application is dead."); | |
1071 | } | |
78f0bacd DG |
1072 | goto error; |
1073 | } | |
1074 | ||
1075 | ua_chan->enabled = 1; | |
1076 | ||
1077 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1078 | ua_chan->name, app->pid); |
78f0bacd DG |
1079 | |
1080 | error: | |
840cb59c | 1081 | health_code_update(); |
78f0bacd DG |
1082 | return ret; |
1083 | } | |
1084 | ||
edb67388 DG |
1085 | /* |
1086 | * Enable the specified event on to UST tracer for the UST session. | |
1087 | */ | |
1088 | static int enable_ust_event(struct ust_app *app, | |
1089 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1090 | { | |
1091 | int ret; | |
1092 | ||
840cb59c | 1093 | health_code_update(); |
86acf0da | 1094 | |
852d0037 | 1095 | ret = ustctl_enable(app->sock, ua_event->obj); |
edb67388 | 1096 | if (ret < 0) { |
ffe60014 DG |
1097 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1098 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1099 | "and session handle %d with ret %d", | |
1100 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1101 | } else { | |
1102 | DBG3("UST app enable event failed. Application is dead."); | |
1103 | } | |
edb67388 DG |
1104 | goto error; |
1105 | } | |
1106 | ||
1107 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1108 | ua_event->attr.name, app->pid); |
edb67388 DG |
1109 | |
1110 | error: | |
840cb59c | 1111 | health_code_update(); |
edb67388 DG |
1112 | return ret; |
1113 | } | |
1114 | ||
099e26bd | 1115 | /* |
7972aab2 | 1116 | * Send channel and stream buffer to application. |
4f3ab6ee | 1117 | * |
ffe60014 | 1118 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1119 | */ |
7972aab2 DG |
1120 | static int send_channel_pid_to_ust(struct ust_app *app, |
1121 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1122 | { |
1123 | int ret; | |
ffe60014 | 1124 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1125 | |
1126 | assert(app); | |
ffe60014 | 1127 | assert(ua_sess); |
4f3ab6ee | 1128 | assert(ua_chan); |
4f3ab6ee | 1129 | |
840cb59c | 1130 | health_code_update(); |
4f3ab6ee | 1131 | |
7972aab2 DG |
1132 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1133 | app->sock); | |
86acf0da | 1134 | |
ffe60014 DG |
1135 | /* Send channel to the application. */ |
1136 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
5b4a0ec0 | 1137 | if (ret < 0) { |
b551a063 DG |
1138 | goto error; |
1139 | } | |
1140 | ||
d88aee68 DG |
1141 | health_code_update(); |
1142 | ||
ffe60014 DG |
1143 | /* Send all streams to application. */ |
1144 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1145 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
1146 | if (ret < 0) { | |
1147 | goto error; | |
1148 | } | |
1149 | /* We don't need the stream anymore once sent to the tracer. */ | |
1150 | cds_list_del(&stream->list); | |
1151 | delete_ust_app_stream(-1, stream); | |
1152 | } | |
ffe60014 DG |
1153 | /* Flag the channel that it is sent to the application. */ |
1154 | ua_chan->is_sent = 1; | |
ffe60014 | 1155 | |
b551a063 | 1156 | error: |
840cb59c | 1157 | health_code_update(); |
b551a063 DG |
1158 | return ret; |
1159 | } | |
1160 | ||
91d76f53 | 1161 | /* |
5b4a0ec0 | 1162 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1163 | * |
1164 | * Should be called with session mutex held. | |
91d76f53 | 1165 | */ |
edb67388 DG |
1166 | static |
1167 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1168 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1169 | { |
5b4a0ec0 | 1170 | int ret = 0; |
284d8f55 | 1171 | |
840cb59c | 1172 | health_code_update(); |
86acf0da | 1173 | |
5b4a0ec0 | 1174 | /* Create UST event on tracer */ |
852d0037 | 1175 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 DG |
1176 | &ua_event->obj); |
1177 | if (ret < 0) { | |
ffe60014 DG |
1178 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1179 | ERR("Error ustctl create event %s for app pid: %d with ret %d", | |
1180 | ua_event->attr.name, app->pid, ret); | |
1181 | } else { | |
1182 | DBG3("UST app create event failed. Application is dead."); | |
1183 | } | |
5b4a0ec0 | 1184 | goto error; |
91d76f53 | 1185 | } |
f6a9efaa | 1186 | |
5b4a0ec0 | 1187 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1188 | |
5b4a0ec0 | 1189 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1190 | ua_event->attr.name, app->pid); |
f6a9efaa | 1191 | |
840cb59c | 1192 | health_code_update(); |
86acf0da | 1193 | |
025faf73 DG |
1194 | /* Set filter if one is present. */ |
1195 | if (ua_event->filter) { | |
1196 | ret = set_ust_event_filter(ua_event, app); | |
1197 | if (ret < 0) { | |
1198 | goto error; | |
1199 | } | |
1200 | } | |
1201 | ||
8535a6d9 | 1202 | /* If event not enabled, disable it on the tracer */ |
fc34caaa | 1203 | if (ua_event->enabled == 0) { |
8535a6d9 DG |
1204 | ret = disable_ust_event(app, ua_sess, ua_event); |
1205 | if (ret < 0) { | |
fc34caaa DG |
1206 | /* |
1207 | * If we hit an EPERM, something is wrong with our disable call. If | |
1208 | * we get an EEXIST, there is a problem on the tracer side since we | |
1209 | * just created it. | |
1210 | */ | |
1211 | switch (ret) { | |
49c336c1 | 1212 | case -LTTNG_UST_ERR_PERM: |
fc34caaa DG |
1213 | /* Code flow problem */ |
1214 | assert(0); | |
49c336c1 | 1215 | case -LTTNG_UST_ERR_EXIST: |
fc34caaa DG |
1216 | /* It's OK for our use case. */ |
1217 | ret = 0; | |
1218 | break; | |
1219 | default: | |
1220 | break; | |
1221 | } | |
8535a6d9 DG |
1222 | goto error; |
1223 | } | |
1224 | } | |
1225 | ||
5b4a0ec0 | 1226 | error: |
840cb59c | 1227 | health_code_update(); |
5b4a0ec0 | 1228 | return ret; |
91d76f53 | 1229 | } |
48842b30 | 1230 | |
5b4a0ec0 DG |
1231 | /* |
1232 | * Copy data between an UST app event and a LTT event. | |
1233 | */ | |
421cb601 | 1234 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1235 | struct ltt_ust_event *uevent) |
1236 | { | |
1237 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); | |
1238 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1239 | ||
fc34caaa DG |
1240 | ua_event->enabled = uevent->enabled; |
1241 | ||
5b4a0ec0 DG |
1242 | /* Copy event attributes */ |
1243 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1244 | ||
53a80697 MD |
1245 | /* Copy filter bytecode */ |
1246 | if (uevent->filter) { | |
025faf73 DG |
1247 | ua_event->filter = alloc_copy_ust_app_filter(uevent->filter); |
1248 | /* Filter might be NULL here in case of ENONEM. */ | |
53a80697 | 1249 | } |
48842b30 DG |
1250 | } |
1251 | ||
5b4a0ec0 DG |
1252 | /* |
1253 | * Copy data between an UST app channel and a LTT channel. | |
1254 | */ | |
421cb601 | 1255 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1256 | struct ltt_ust_channel *uchan) |
1257 | { | |
bec39940 | 1258 | struct lttng_ht_iter iter; |
48842b30 | 1259 | struct ltt_ust_event *uevent; |
55cc08a6 | 1260 | struct ltt_ust_context *uctx; |
48842b30 | 1261 | struct ust_app_event *ua_event; |
55cc08a6 | 1262 | struct ust_app_ctx *ua_ctx; |
48842b30 | 1263 | |
fc34caaa | 1264 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1265 | |
1266 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1267 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 DG |
1268 | |
1269 | /* Copy event attributes since the layout is different. */ | |
1270 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1271 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1272 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1273 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1274 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
1275 | ua_chan->attr.output = uchan->attr.output; | |
1276 | /* | |
1277 | * Note that the attribute channel type is not set since the channel on the | |
1278 | * tracing registry side does not have this information. | |
1279 | */ | |
48842b30 | 1280 | |
fc34caaa | 1281 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1282 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1283 | |
bec39940 | 1284 | cds_lfht_for_each_entry(uchan->ctx->ht, &iter.iter, uctx, node.node) { |
55cc08a6 DG |
1285 | ua_ctx = alloc_ust_app_ctx(&uctx->ctx); |
1286 | if (ua_ctx == NULL) { | |
1287 | continue; | |
1288 | } | |
bec39940 DG |
1289 | lttng_ht_node_init_ulong(&ua_ctx->node, |
1290 | (unsigned long) ua_ctx->ctx.ctx); | |
1291 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
55cc08a6 | 1292 | } |
48842b30 | 1293 | |
421cb601 | 1294 | /* Copy all events from ltt ust channel to ust app channel */ |
bec39940 | 1295 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
18eace3b DG |
1296 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
1297 | uevent->filter, uevent->attr.loglevel); | |
1298 | if (ua_event == NULL) { | |
421cb601 | 1299 | DBG2("UST event %s not found on shadow copy channel", |
48842b30 | 1300 | uevent->attr.name); |
284d8f55 | 1301 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
48842b30 | 1302 | if (ua_event == NULL) { |
5b4a0ec0 | 1303 | continue; |
48842b30 | 1304 | } |
421cb601 | 1305 | shadow_copy_event(ua_event, uevent); |
d0b96690 | 1306 | add_unique_ust_app_event(ua_chan, ua_event); |
48842b30 | 1307 | } |
48842b30 DG |
1308 | } |
1309 | ||
fc34caaa | 1310 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1311 | } |
1312 | ||
5b4a0ec0 DG |
1313 | /* |
1314 | * Copy data between a UST app session and a regular LTT session. | |
1315 | */ | |
421cb601 | 1316 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1317 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1318 | { |
bec39940 DG |
1319 | struct lttng_ht_node_str *ua_chan_node; |
1320 | struct lttng_ht_iter iter; | |
48842b30 DG |
1321 | struct ltt_ust_channel *uchan; |
1322 | struct ust_app_channel *ua_chan; | |
477d7741 MD |
1323 | time_t rawtime; |
1324 | struct tm *timeinfo; | |
1325 | char datetime[16]; | |
1326 | int ret; | |
1327 | ||
1328 | /* Get date and time for unique app path */ | |
1329 | time(&rawtime); | |
1330 | timeinfo = localtime(&rawtime); | |
1331 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1332 | |
421cb601 | 1333 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1334 | |
7972aab2 DG |
1335 | ua_sess->tracing_id = usess->id; |
1336 | ua_sess->id = get_next_session_id(); | |
1337 | ua_sess->uid = app->uid; | |
1338 | ua_sess->gid = app->gid; | |
1339 | ua_sess->euid = usess->uid; | |
1340 | ua_sess->egid = usess->gid; | |
1341 | ua_sess->buffer_type = usess->buffer_type; | |
1342 | ua_sess->bits_per_long = app->bits_per_long; | |
1343 | /* There is only one consumer object per session possible. */ | |
1344 | ua_sess->consumer = usess->consumer; | |
1345 | ||
1346 | switch (ua_sess->buffer_type) { | |
1347 | case LTTNG_BUFFER_PER_PID: | |
1348 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1349 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s/", app->name, app->pid, | |
1350 | datetime); | |
1351 | break; | |
1352 | case LTTNG_BUFFER_PER_UID: | |
1353 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1354 | DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long); | |
1355 | break; | |
1356 | default: | |
1357 | assert(0); | |
1358 | goto error; | |
1359 | } | |
477d7741 MD |
1360 | if (ret < 0) { |
1361 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1362 | assert(0); |
7972aab2 | 1363 | goto error; |
477d7741 MD |
1364 | } |
1365 | ||
48842b30 | 1366 | /* Iterate over all channels in global domain. */ |
bec39940 DG |
1367 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, |
1368 | uchan, node.node) { | |
1369 | struct lttng_ht_iter uiter; | |
ba767faf | 1370 | |
bec39940 DG |
1371 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
1372 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
5b4a0ec0 | 1373 | if (ua_chan_node != NULL) { |
fc34caaa | 1374 | /* Session exist. Contiuing. */ |
5b4a0ec0 DG |
1375 | continue; |
1376 | } | |
421cb601 | 1377 | |
5b4a0ec0 DG |
1378 | DBG2("Channel %s not found on shadow session copy, creating it", |
1379 | uchan->name); | |
d0b96690 | 1380 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
5b4a0ec0 | 1381 | if (ua_chan == NULL) { |
fc34caaa | 1382 | /* malloc failed FIXME: Might want to do handle ENOMEM .. */ |
5b4a0ec0 | 1383 | continue; |
48842b30 | 1384 | } |
5b4a0ec0 | 1385 | shadow_copy_channel(ua_chan, uchan); |
ffe60014 DG |
1386 | /* |
1387 | * The concept of metadata channel does not exist on the tracing | |
1388 | * registry side of the session daemon so this can only be a per CPU | |
1389 | * channel and not metadata. | |
1390 | */ | |
1391 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
1392 | ||
bec39940 | 1393 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); |
48842b30 | 1394 | } |
7972aab2 DG |
1395 | |
1396 | error: | |
1397 | return; | |
48842b30 DG |
1398 | } |
1399 | ||
78f0bacd DG |
1400 | /* |
1401 | * Lookup sesison wrapper. | |
1402 | */ | |
84cd17c6 MD |
1403 | static |
1404 | void __lookup_session_by_app(struct ltt_ust_session *usess, | |
bec39940 | 1405 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1406 | { |
1407 | /* Get right UST app session from app */ | |
2c348c10 | 1408 | lttng_ht_lookup(app->sessions, (void *)((unsigned long) usess->id), iter); |
84cd17c6 MD |
1409 | } |
1410 | ||
421cb601 DG |
1411 | /* |
1412 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1413 | * id. |
421cb601 | 1414 | */ |
48842b30 DG |
1415 | static struct ust_app_session *lookup_session_by_app( |
1416 | struct ltt_ust_session *usess, struct ust_app *app) | |
1417 | { | |
bec39940 DG |
1418 | struct lttng_ht_iter iter; |
1419 | struct lttng_ht_node_ulong *node; | |
48842b30 | 1420 | |
84cd17c6 | 1421 | __lookup_session_by_app(usess, app, &iter); |
bec39940 | 1422 | node = lttng_ht_iter_get_node_ulong(&iter); |
48842b30 DG |
1423 | if (node == NULL) { |
1424 | goto error; | |
1425 | } | |
1426 | ||
1427 | return caa_container_of(node, struct ust_app_session, node); | |
1428 | ||
1429 | error: | |
1430 | return NULL; | |
1431 | } | |
1432 | ||
7972aab2 DG |
1433 | /* |
1434 | * Setup buffer registry per PID for the given session and application. If none | |
1435 | * is found, a new one is created, added to the global registry and | |
1436 | * initialized. If regp is valid, it's set with the newly created object. | |
1437 | * | |
1438 | * Return 0 on success or else a negative value. | |
1439 | */ | |
1440 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
1441 | struct ust_app *app, struct buffer_reg_pid **regp) | |
1442 | { | |
1443 | int ret = 0; | |
1444 | struct buffer_reg_pid *reg_pid; | |
1445 | ||
1446 | assert(ua_sess); | |
1447 | assert(app); | |
1448 | ||
1449 | rcu_read_lock(); | |
1450 | ||
1451 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
1452 | if (!reg_pid) { | |
1453 | /* | |
1454 | * This is the create channel path meaning that if there is NO | |
1455 | * registry available, we have to create one for this session. | |
1456 | */ | |
1457 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid); | |
1458 | if (ret < 0) { | |
1459 | goto error; | |
1460 | } | |
1461 | buffer_reg_pid_add(reg_pid); | |
1462 | } else { | |
1463 | goto end; | |
1464 | } | |
1465 | ||
1466 | /* Initialize registry. */ | |
1467 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
1468 | app->bits_per_long, app->uint8_t_alignment, | |
1469 | app->uint16_t_alignment, app->uint32_t_alignment, | |
1470 | app->uint64_t_alignment, app->long_alignment, app->byte_order); | |
1471 | if (ret < 0) { | |
1472 | goto error; | |
1473 | } | |
1474 | ||
1475 | DBG3("UST app buffer registry per PID created successfully"); | |
1476 | ||
1477 | end: | |
1478 | if (regp) { | |
1479 | *regp = reg_pid; | |
1480 | } | |
1481 | error: | |
1482 | rcu_read_unlock(); | |
1483 | return ret; | |
1484 | } | |
1485 | ||
1486 | /* | |
1487 | * Setup buffer registry per UID for the given session and application. If none | |
1488 | * is found, a new one is created, added to the global registry and | |
1489 | * initialized. If regp is valid, it's set with the newly created object. | |
1490 | * | |
1491 | * Return 0 on success or else a negative value. | |
1492 | */ | |
1493 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
1494 | struct ust_app *app, struct buffer_reg_uid **regp) | |
1495 | { | |
1496 | int ret = 0; | |
1497 | struct buffer_reg_uid *reg_uid; | |
1498 | ||
1499 | assert(usess); | |
1500 | assert(app); | |
1501 | ||
1502 | rcu_read_lock(); | |
1503 | ||
1504 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
1505 | if (!reg_uid) { | |
1506 | /* | |
1507 | * This is the create channel path meaning that if there is NO | |
1508 | * registry available, we have to create one for this session. | |
1509 | */ | |
1510 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
1511 | LTTNG_DOMAIN_UST, ®_uid); | |
1512 | if (ret < 0) { | |
1513 | goto error; | |
1514 | } | |
1515 | buffer_reg_uid_add(reg_uid); | |
1516 | } else { | |
1517 | goto end; | |
1518 | } | |
1519 | ||
1520 | /* Initialize registry. */ | |
1521 | ret = ust_registry_session_init(®_uid->registry->reg.ust, app, | |
1522 | app->bits_per_long, app->uint8_t_alignment, | |
1523 | app->uint16_t_alignment, app->uint32_t_alignment, | |
1524 | app->uint64_t_alignment, app->long_alignment, app->byte_order); | |
1525 | if (ret < 0) { | |
1526 | goto error; | |
1527 | } | |
1528 | /* Add node to teardown list of the session. */ | |
1529 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
1530 | ||
1531 | DBG3("UST app buffer registry per UID created successfully"); | |
1532 | ||
1533 | end: | |
1534 | if (regp) { | |
1535 | *regp = reg_uid; | |
1536 | } | |
1537 | error: | |
1538 | rcu_read_unlock(); | |
1539 | return ret; | |
1540 | } | |
1541 | ||
421cb601 | 1542 | /* |
3d8ca23b | 1543 | * Create a session on the tracer side for the given app. |
421cb601 | 1544 | * |
3d8ca23b DG |
1545 | * On success, ua_sess_ptr is populated with the session pointer or else left |
1546 | * untouched. If the session was created, is_created is set to 1. On error, | |
1547 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
1548 | * be NULL. | |
1549 | * | |
1550 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
1551 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 1552 | */ |
3d8ca23b DG |
1553 | static int create_ust_app_session(struct ltt_ust_session *usess, |
1554 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, | |
1555 | int *is_created) | |
421cb601 | 1556 | { |
3d8ca23b | 1557 | int ret, created = 0; |
421cb601 DG |
1558 | struct ust_app_session *ua_sess; |
1559 | ||
3d8ca23b DG |
1560 | assert(usess); |
1561 | assert(app); | |
1562 | assert(ua_sess_ptr); | |
1563 | ||
840cb59c | 1564 | health_code_update(); |
86acf0da | 1565 | |
421cb601 DG |
1566 | ua_sess = lookup_session_by_app(usess, app); |
1567 | if (ua_sess == NULL) { | |
a991f516 | 1568 | DBG2("UST app pid: %d session id %d not found, creating it", |
852d0037 | 1569 | app->pid, usess->id); |
d0b96690 | 1570 | ua_sess = alloc_ust_app_session(app); |
421cb601 DG |
1571 | if (ua_sess == NULL) { |
1572 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
1573 | ret = -ENOMEM; |
1574 | goto error; | |
421cb601 | 1575 | } |
477d7741 | 1576 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 1577 | created = 1; |
421cb601 DG |
1578 | } |
1579 | ||
7972aab2 DG |
1580 | switch (usess->buffer_type) { |
1581 | case LTTNG_BUFFER_PER_PID: | |
1582 | /* Init local registry. */ | |
1583 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 1584 | if (ret < 0) { |
7972aab2 DG |
1585 | goto error; |
1586 | } | |
1587 | break; | |
1588 | case LTTNG_BUFFER_PER_UID: | |
1589 | /* Look for a global registry. If none exists, create one. */ | |
1590 | ret = setup_buffer_reg_uid(usess, app, NULL); | |
1591 | if (ret < 0) { | |
1592 | goto error; | |
1593 | } | |
1594 | break; | |
1595 | default: | |
1596 | assert(0); | |
1597 | ret = -EINVAL; | |
1598 | goto error; | |
1599 | } | |
1600 | ||
1601 | health_code_update(); | |
1602 | ||
1603 | if (ua_sess->handle == -1) { | |
1604 | ret = ustctl_create_session(app->sock); | |
1605 | if (ret < 0) { | |
1606 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1607 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
1608 | app->pid, ret); |
1609 | } else { | |
1610 | DBG("UST app creating session failed. Application is dead"); | |
1611 | } | |
d0b96690 | 1612 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
1613 | if (ret != -ENOMEM) { |
1614 | /* | |
1615 | * Tracer is probably gone or got an internal error so let's | |
1616 | * behave like it will soon unregister or not usable. | |
1617 | */ | |
1618 | ret = -ENOTCONN; | |
1619 | } | |
1620 | goto error; | |
421cb601 DG |
1621 | } |
1622 | ||
7972aab2 DG |
1623 | ua_sess->handle = ret; |
1624 | ||
1625 | /* Add ust app session to app's HT */ | |
1626 | lttng_ht_node_init_ulong(&ua_sess->node, | |
1627 | (unsigned long) ua_sess->tracing_id); | |
1628 | lttng_ht_add_unique_ulong(app->sessions, &ua_sess->node); | |
1629 | ||
1630 | DBG2("UST app session created successfully with handle %d", ret); | |
1631 | } | |
1632 | ||
1633 | *ua_sess_ptr = ua_sess; | |
1634 | if (is_created) { | |
1635 | *is_created = created; | |
1636 | } | |
1637 | ||
1638 | /* Everything went well. */ | |
1639 | ret = 0; | |
1640 | ||
1641 | error: | |
1642 | health_code_update(); | |
1643 | return ret; | |
1644 | } | |
1645 | ||
1646 | /* | |
1647 | * Create a context for the channel on the tracer. | |
1648 | * | |
1649 | * Called with UST app session lock held and a RCU read side lock. | |
1650 | */ | |
1651 | static | |
1652 | int create_ust_app_channel_context(struct ust_app_session *ua_sess, | |
1653 | struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx, | |
1654 | struct ust_app *app) | |
1655 | { | |
1656 | int ret = 0; | |
1657 | struct lttng_ht_iter iter; | |
1658 | struct lttng_ht_node_ulong *node; | |
1659 | struct ust_app_ctx *ua_ctx; | |
1660 | ||
1661 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
1662 | ||
1663 | lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter); | |
1664 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1665 | if (node != NULL) { | |
1666 | ret = -EEXIST; | |
1667 | goto error; | |
1668 | } | |
1669 | ||
1670 | ua_ctx = alloc_ust_app_ctx(uctx); | |
1671 | if (ua_ctx == NULL) { | |
1672 | /* malloc failed */ | |
1673 | ret = -1; | |
1674 | goto error; | |
1675 | } | |
1676 | ||
1677 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
1678 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
1679 | ||
1680 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
1681 | if (ret < 0) { | |
1682 | goto error; | |
1683 | } | |
1684 | ||
1685 | error: | |
1686 | return ret; | |
1687 | } | |
1688 | ||
1689 | /* | |
1690 | * Enable on the tracer side a ust app event for the session and channel. | |
1691 | * | |
1692 | * Called with UST app session lock held. | |
1693 | */ | |
1694 | static | |
1695 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
1696 | struct ust_app_event *ua_event, struct ust_app *app) | |
1697 | { | |
1698 | int ret; | |
1699 | ||
1700 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1701 | if (ret < 0) { | |
1702 | goto error; | |
1703 | } | |
1704 | ||
1705 | ua_event->enabled = 1; | |
1706 | ||
1707 | error: | |
1708 | return ret; | |
1709 | } | |
1710 | ||
1711 | /* | |
1712 | * Disable on the tracer side a ust app event for the session and channel. | |
1713 | */ | |
1714 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
1715 | struct ust_app_event *ua_event, struct ust_app *app) | |
1716 | { | |
1717 | int ret; | |
1718 | ||
1719 | ret = disable_ust_event(app, ua_sess, ua_event); | |
1720 | if (ret < 0) { | |
1721 | goto error; | |
1722 | } | |
1723 | ||
1724 | ua_event->enabled = 0; | |
1725 | ||
1726 | error: | |
1727 | return ret; | |
1728 | } | |
1729 | ||
1730 | /* | |
1731 | * Lookup ust app channel for session and disable it on the tracer side. | |
1732 | */ | |
1733 | static | |
1734 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
1735 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
1736 | { | |
1737 | int ret; | |
1738 | ||
1739 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
1740 | if (ret < 0) { | |
1741 | goto error; | |
1742 | } | |
1743 | ||
1744 | ua_chan->enabled = 0; | |
1745 | ||
1746 | error: | |
1747 | return ret; | |
1748 | } | |
1749 | ||
1750 | /* | |
1751 | * Lookup ust app channel for session and enable it on the tracer side. This | |
1752 | * MUST be called with a RCU read side lock acquired. | |
1753 | */ | |
1754 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
1755 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
1756 | { | |
1757 | int ret = 0; | |
1758 | struct lttng_ht_iter iter; | |
1759 | struct lttng_ht_node_str *ua_chan_node; | |
1760 | struct ust_app_channel *ua_chan; | |
1761 | ||
1762 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
1763 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
1764 | if (ua_chan_node == NULL) { | |
1765 | DBG2("Unable to find channel %s in ust session id %u", | |
1766 | uchan->name, ua_sess->tracing_id); | |
1767 | goto error; | |
1768 | } | |
1769 | ||
1770 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
1771 | ||
1772 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
1773 | if (ret < 0) { | |
1774 | goto error; | |
1775 | } | |
1776 | ||
1777 | error: | |
1778 | return ret; | |
1779 | } | |
1780 | ||
1781 | /* | |
1782 | * Ask the consumer to create a channel and get it if successful. | |
1783 | * | |
1784 | * Return 0 on success or else a negative value. | |
1785 | */ | |
1786 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
1787 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
1788 | int bitness, struct ust_registry_session *registry) | |
1789 | { | |
1790 | int ret; | |
1791 | unsigned int nb_fd = 0; | |
1792 | struct consumer_socket *socket; | |
1793 | ||
1794 | assert(usess); | |
1795 | assert(ua_sess); | |
1796 | assert(ua_chan); | |
1797 | assert(registry); | |
1798 | ||
1799 | rcu_read_lock(); | |
1800 | health_code_update(); | |
1801 | ||
1802 | /* Get the right consumer socket for the application. */ | |
1803 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
1804 | if (!socket) { | |
1805 | ret = -EINVAL; | |
1806 | goto error; | |
1807 | } | |
1808 | ||
1809 | health_code_update(); | |
1810 | ||
1811 | /* Need one fd for the channel. */ | |
1812 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
1813 | if (ret < 0) { | |
1814 | ERR("Exhausted number of available FD upon create channel"); | |
1815 | goto error; | |
1816 | } | |
1817 | ||
1818 | /* | |
1819 | * Ask consumer to create channel. The consumer will return the number of | |
1820 | * stream we have to expect. | |
1821 | */ | |
1822 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
1823 | registry); | |
1824 | if (ret < 0) { | |
1825 | goto error_ask; | |
1826 | } | |
1827 | ||
1828 | /* | |
1829 | * Compute the number of fd needed before receiving them. It must be 2 per | |
1830 | * stream (2 being the default value here). | |
1831 | */ | |
1832 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
1833 | ||
1834 | /* Reserve the amount of file descriptor we need. */ | |
1835 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
1836 | if (ret < 0) { | |
1837 | ERR("Exhausted number of available FD upon create channel"); | |
1838 | goto error_fd_get_stream; | |
1839 | } | |
1840 | ||
1841 | health_code_update(); | |
1842 | ||
1843 | /* | |
1844 | * Now get the channel from the consumer. This call wil populate the stream | |
1845 | * list of that channel and set the ust objects. | |
1846 | */ | |
1847 | ret = ust_consumer_get_channel(socket, ua_chan); | |
1848 | if (ret < 0) { | |
1849 | goto error_destroy; | |
1850 | } | |
1851 | ||
1852 | rcu_read_unlock(); | |
1853 | return 0; | |
1854 | ||
1855 | error_destroy: | |
1856 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
1857 | error_fd_get_stream: | |
1858 | /* | |
1859 | * Initiate a destroy channel on the consumer since we had an error | |
1860 | * handling it on our side. The return value is of no importance since we | |
1861 | * already have a ret value set by the previous error that we need to | |
1862 | * return. | |
1863 | */ | |
1864 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
1865 | error_ask: | |
1866 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
1867 | error: | |
1868 | health_code_update(); | |
1869 | rcu_read_unlock(); | |
1870 | return ret; | |
1871 | } | |
1872 | ||
1873 | /* | |
1874 | * Duplicate the ust data object of the ust app stream and save it in the | |
1875 | * buffer registry stream. | |
1876 | * | |
1877 | * Return 0 on success or else a negative value. | |
1878 | */ | |
1879 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
1880 | struct ust_app_stream *stream) | |
1881 | { | |
1882 | int ret; | |
1883 | ||
1884 | assert(reg_stream); | |
1885 | assert(stream); | |
1886 | ||
1887 | /* Reserve the amount of file descriptor we need. */ | |
1888 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
1889 | if (ret < 0) { | |
1890 | ERR("Exhausted number of available FD upon duplicate stream"); | |
1891 | goto error; | |
1892 | } | |
1893 | ||
1894 | /* Duplicate object for stream once the original is in the registry. */ | |
1895 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
1896 | reg_stream->obj.ust); | |
1897 | if (ret < 0) { | |
1898 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
1899 | reg_stream->obj.ust, stream->obj, ret); | |
1900 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
1901 | goto error; | |
1902 | } | |
1903 | stream->handle = stream->obj->handle; | |
1904 | ||
1905 | error: | |
1906 | return ret; | |
1907 | } | |
1908 | ||
1909 | /* | |
1910 | * Duplicate the ust data object of the ust app. channel and save it in the | |
1911 | * buffer registry channel. | |
1912 | * | |
1913 | * Return 0 on success or else a negative value. | |
1914 | */ | |
1915 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
1916 | struct ust_app_channel *ua_chan) | |
1917 | { | |
1918 | int ret; | |
1919 | ||
1920 | assert(reg_chan); | |
1921 | assert(ua_chan); | |
1922 | ||
1923 | /* Need two fds for the channel. */ | |
1924 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
1925 | if (ret < 0) { | |
1926 | ERR("Exhausted number of available FD upon duplicate channel"); | |
1927 | goto error_fd_get; | |
1928 | } | |
1929 | ||
1930 | /* Duplicate object for stream once the original is in the registry. */ | |
1931 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
1932 | if (ret < 0) { | |
1933 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
1934 | reg_chan->obj.ust, ua_chan->obj, ret); | |
1935 | goto error; | |
1936 | } | |
1937 | ua_chan->handle = ua_chan->obj->handle; | |
1938 | ||
1939 | return 0; | |
1940 | ||
1941 | error: | |
1942 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
1943 | error_fd_get: | |
1944 | return ret; | |
1945 | } | |
1946 | ||
1947 | /* | |
1948 | * For a given channel buffer registry, setup all streams of the given ust | |
1949 | * application channel. | |
1950 | * | |
1951 | * Return 0 on success or else a negative value. | |
1952 | */ | |
1953 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
1954 | struct ust_app_channel *ua_chan) | |
1955 | { | |
1956 | int ret = 0; | |
1957 | struct ust_app_stream *stream, *stmp; | |
1958 | ||
1959 | assert(reg_chan); | |
1960 | assert(ua_chan); | |
1961 | ||
1962 | DBG2("UST app setup buffer registry stream"); | |
1963 | ||
1964 | /* Send all streams to application. */ | |
1965 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1966 | struct buffer_reg_stream *reg_stream; | |
1967 | ||
1968 | ret = buffer_reg_stream_create(®_stream); | |
1969 | if (ret < 0) { | |
1970 | goto error; | |
1971 | } | |
1972 | ||
1973 | /* | |
1974 | * Keep original pointer and nullify it in the stream so the delete | |
1975 | * stream call does not release the object. | |
1976 | */ | |
1977 | reg_stream->obj.ust = stream->obj; | |
1978 | stream->obj = NULL; | |
1979 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 1980 | |
7972aab2 DG |
1981 | /* We don't need the streams anymore. */ |
1982 | cds_list_del(&stream->list); | |
1983 | delete_ust_app_stream(-1, stream); | |
1984 | } | |
421cb601 | 1985 | |
7972aab2 DG |
1986 | error: |
1987 | return ret; | |
1988 | } | |
1989 | ||
1990 | /* | |
1991 | * Create a buffer registry channel for the given session registry and | |
1992 | * application channel object. If regp pointer is valid, it's set with the | |
1993 | * created object. Important, the created object is NOT added to the session | |
1994 | * registry hash table. | |
1995 | * | |
1996 | * Return 0 on success else a negative value. | |
1997 | */ | |
1998 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
1999 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2000 | { | |
2001 | int ret; | |
2002 | struct buffer_reg_channel *reg_chan = NULL; | |
2003 | ||
2004 | assert(reg_sess); | |
2005 | assert(ua_chan); | |
2006 | ||
2007 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2008 | ||
2009 | /* Create buffer registry channel. */ | |
2010 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2011 | if (ret < 0) { | |
2012 | goto error_create; | |
421cb601 | 2013 | } |
7972aab2 DG |
2014 | assert(reg_chan); |
2015 | reg_chan->consumer_key = ua_chan->key; | |
421cb601 | 2016 | |
7972aab2 DG |
2017 | /* Create and add a channel registry to session. */ |
2018 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2019 | ua_chan->tracing_channel_id); | |
2020 | if (ret < 0) { | |
2021 | goto error; | |
d88aee68 | 2022 | } |
7972aab2 | 2023 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2024 | |
7972aab2 DG |
2025 | if (regp) { |
2026 | *regp = reg_chan; | |
3d8ca23b | 2027 | } |
d88aee68 | 2028 | |
7972aab2 | 2029 | return 0; |
3d8ca23b DG |
2030 | |
2031 | error: | |
7972aab2 DG |
2032 | /* Safe because the registry channel object was not added to any HT. */ |
2033 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2034 | error_create: | |
3d8ca23b | 2035 | return ret; |
421cb601 DG |
2036 | } |
2037 | ||
55cc08a6 | 2038 | /* |
7972aab2 DG |
2039 | * Setup buffer registry channel for the given session registry and application |
2040 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2041 | * |
7972aab2 | 2042 | * Return 0 on success else a negative value. |
55cc08a6 | 2043 | */ |
7972aab2 DG |
2044 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
2045 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan) | |
55cc08a6 | 2046 | { |
7972aab2 | 2047 | int ret; |
55cc08a6 | 2048 | |
7972aab2 DG |
2049 | assert(reg_sess); |
2050 | assert(reg_chan); | |
2051 | assert(ua_chan); | |
2052 | assert(ua_chan->obj); | |
55cc08a6 | 2053 | |
7972aab2 | 2054 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2055 | |
7972aab2 DG |
2056 | /* Setup all streams for the registry. */ |
2057 | ret = setup_buffer_reg_streams(reg_chan, ua_chan); | |
2058 | if (ret < 0) { | |
55cc08a6 DG |
2059 | goto error; |
2060 | } | |
2061 | ||
7972aab2 DG |
2062 | reg_chan->obj.ust = ua_chan->obj; |
2063 | ua_chan->obj = NULL; | |
55cc08a6 | 2064 | |
7972aab2 | 2065 | return 0; |
55cc08a6 DG |
2066 | |
2067 | error: | |
7972aab2 DG |
2068 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2069 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2070 | return ret; |
2071 | } | |
2072 | ||
edb67388 | 2073 | /* |
7972aab2 | 2074 | * Send buffer registry channel to the application. |
d0b96690 | 2075 | * |
7972aab2 | 2076 | * Return 0 on success else a negative value. |
edb67388 | 2077 | */ |
7972aab2 DG |
2078 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2079 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2080 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2081 | { |
2082 | int ret; | |
7972aab2 | 2083 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2084 | |
7972aab2 DG |
2085 | assert(reg_chan); |
2086 | assert(app); | |
2087 | assert(ua_sess); | |
2088 | assert(ua_chan); | |
2089 | ||
2090 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2091 | ||
2092 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2093 | if (ret < 0) { |
2094 | goto error; | |
2095 | } | |
2096 | ||
7972aab2 DG |
2097 | /* Send channel to the application. */ |
2098 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
2099 | if (ret < 0) { | |
2100 | goto error; | |
2101 | } | |
2102 | ||
2103 | health_code_update(); | |
2104 | ||
2105 | /* Send all streams to application. */ | |
2106 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2107 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2108 | struct ust_app_stream stream; | |
2109 | ||
2110 | ret = duplicate_stream_object(reg_stream, &stream); | |
2111 | if (ret < 0) { | |
2112 | goto error_stream_unlock; | |
2113 | } | |
2114 | ||
2115 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2116 | if (ret < 0) { | |
2117 | goto error_stream_unlock; | |
2118 | } | |
edb67388 | 2119 | |
7972aab2 DG |
2120 | /* |
2121 | * The return value is not important here. This function will output an | |
2122 | * error if needed. | |
2123 | */ | |
2124 | (void) release_ust_app_stream(-1, &stream); | |
2125 | } | |
2126 | ua_chan->is_sent = 1; | |
2127 | ||
2128 | error_stream_unlock: | |
2129 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2130 | error: |
2131 | return ret; | |
2132 | } | |
2133 | ||
9730260e | 2134 | /* |
7972aab2 DG |
2135 | * Create and send to the application the created buffers with per UID buffers. |
2136 | * | |
2137 | * Return 0 on success else a negative value. | |
9730260e | 2138 | */ |
7972aab2 DG |
2139 | static int create_channel_per_uid(struct ust_app *app, |
2140 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2141 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2142 | { |
2143 | int ret; | |
7972aab2 DG |
2144 | struct buffer_reg_uid *reg_uid; |
2145 | struct buffer_reg_channel *reg_chan; | |
9730260e | 2146 | |
7972aab2 DG |
2147 | assert(app); |
2148 | assert(usess); | |
2149 | assert(ua_sess); | |
2150 | assert(ua_chan); | |
2151 | ||
2152 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2153 | ||
2154 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2155 | /* | |
2156 | * The session creation handles the creation of this global registry | |
2157 | * object. If none can be find, there is a code flow problem or a | |
2158 | * teardown race. | |
2159 | */ | |
2160 | assert(reg_uid); | |
2161 | ||
2162 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2163 | reg_uid); | |
2164 | if (!reg_chan) { | |
2165 | /* Create the buffer registry channel object. */ | |
2166 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2167 | if (ret < 0) { | |
2168 | goto error; | |
2169 | } | |
2170 | assert(reg_chan); | |
2171 | ||
2172 | /* | |
2173 | * Create the buffers on the consumer side. This call populates the | |
2174 | * ust app channel object with all streams and data object. | |
2175 | */ | |
2176 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2177 | app->bits_per_long, reg_uid->registry->reg.ust); | |
2178 | if (ret < 0) { | |
2179 | goto error; | |
2180 | } | |
2181 | ||
2182 | /* | |
2183 | * Setup the streams and add it to the session registry. | |
2184 | */ | |
2185 | ret = setup_buffer_reg_channel(reg_uid->registry, ua_chan, reg_chan); | |
2186 | if (ret < 0) { | |
2187 | goto error; | |
2188 | } | |
2189 | ||
2190 | } | |
2191 | ||
2192 | /* Send buffers to the application. */ | |
2193 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
9730260e DG |
2194 | if (ret < 0) { |
2195 | goto error; | |
2196 | } | |
2197 | ||
9730260e DG |
2198 | error: |
2199 | return ret; | |
2200 | } | |
2201 | ||
78f0bacd | 2202 | /* |
7972aab2 DG |
2203 | * Create and send to the application the created buffers with per PID buffers. |
2204 | * | |
2205 | * Return 0 on success else a negative value. | |
78f0bacd | 2206 | */ |
7972aab2 DG |
2207 | static int create_channel_per_pid(struct ust_app *app, |
2208 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2209 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2210 | { |
8535a6d9 | 2211 | int ret; |
7972aab2 | 2212 | struct ust_registry_session *registry; |
78f0bacd | 2213 | |
7972aab2 DG |
2214 | assert(app); |
2215 | assert(usess); | |
2216 | assert(ua_sess); | |
2217 | assert(ua_chan); | |
2218 | ||
2219 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2220 | ||
2221 | rcu_read_lock(); | |
2222 | ||
2223 | registry = get_session_registry(ua_sess); | |
2224 | assert(registry); | |
2225 | ||
2226 | /* Create and add a new channel registry to session. */ | |
2227 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd DG |
2228 | if (ret < 0) { |
2229 | goto error; | |
2230 | } | |
2231 | ||
7972aab2 DG |
2232 | /* Create and get channel on the consumer side. */ |
2233 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2234 | app->bits_per_long, registry); | |
2235 | if (ret < 0) { | |
2236 | goto error; | |
2237 | } | |
2238 | ||
2239 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
2240 | if (ret < 0) { | |
2241 | goto error; | |
2242 | } | |
8535a6d9 | 2243 | |
78f0bacd | 2244 | error: |
7972aab2 | 2245 | rcu_read_unlock(); |
78f0bacd DG |
2246 | return ret; |
2247 | } | |
2248 | ||
2249 | /* | |
7972aab2 DG |
2250 | * From an already allocated ust app channel, create the channel buffers if |
2251 | * need and send it to the application. This MUST be called with a RCU read | |
2252 | * side lock acquired. | |
2253 | * | |
2254 | * Return 0 on success or else a negative value. | |
78f0bacd | 2255 | */ |
7972aab2 DG |
2256 | static int do_create_channel(struct ust_app *app, |
2257 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2258 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2259 | { |
7972aab2 | 2260 | int ret; |
78f0bacd | 2261 | |
7972aab2 DG |
2262 | assert(app); |
2263 | assert(usess); | |
2264 | assert(ua_sess); | |
2265 | assert(ua_chan); | |
2266 | ||
2267 | /* Handle buffer type before sending the channel to the application. */ | |
2268 | switch (usess->buffer_type) { | |
2269 | case LTTNG_BUFFER_PER_UID: | |
2270 | { | |
2271 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
2272 | if (ret < 0) { | |
2273 | goto error; | |
2274 | } | |
2275 | break; | |
2276 | } | |
2277 | case LTTNG_BUFFER_PER_PID: | |
2278 | { | |
2279 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
2280 | if (ret < 0) { | |
2281 | goto error; | |
2282 | } | |
2283 | break; | |
2284 | } | |
2285 | default: | |
2286 | assert(0); | |
2287 | ret = -EINVAL; | |
78f0bacd DG |
2288 | goto error; |
2289 | } | |
2290 | ||
7972aab2 DG |
2291 | /* Initialize ust objd object using the received handle and add it. */ |
2292 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
2293 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 2294 | |
7972aab2 DG |
2295 | /* If channel is not enabled, disable it on the tracer */ |
2296 | if (!ua_chan->enabled) { | |
2297 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2298 | if (ret < 0) { | |
2299 | goto error; | |
2300 | } | |
78f0bacd DG |
2301 | } |
2302 | ||
2303 | error: | |
2304 | return ret; | |
2305 | } | |
2306 | ||
284d8f55 | 2307 | /* |
4d710ac2 DG |
2308 | * Create UST app channel and create it on the tracer. Set ua_chanp of the |
2309 | * newly created channel if not NULL. | |
d0b96690 DG |
2310 | * |
2311 | * Called with UST app session lock held. | |
7972aab2 DG |
2312 | * |
2313 | * Return 0 on success or else a negative value. | |
284d8f55 | 2314 | */ |
4d710ac2 DG |
2315 | static int create_ust_app_channel(struct ust_app_session *ua_sess, |
2316 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
7972aab2 | 2317 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 2318 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
2319 | { |
2320 | int ret = 0; | |
bec39940 DG |
2321 | struct lttng_ht_iter iter; |
2322 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
2323 | struct ust_app_channel *ua_chan; |
2324 | ||
2325 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
2326 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
2327 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 2328 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 2329 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 2330 | goto end; |
5b4a0ec0 DG |
2331 | } |
2332 | ||
d0b96690 | 2333 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
2334 | if (ua_chan == NULL) { |
2335 | /* Only malloc can fail here */ | |
4d710ac2 | 2336 | ret = -ENOMEM; |
fc34caaa DG |
2337 | goto error; |
2338 | } | |
2339 | shadow_copy_channel(ua_chan, uchan); | |
2340 | ||
ffe60014 DG |
2341 | /* Set channel type. */ |
2342 | ua_chan->attr.type = type; | |
2343 | ||
7972aab2 | 2344 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
5b4a0ec0 DG |
2345 | if (ret < 0) { |
2346 | goto error; | |
2347 | } | |
2348 | ||
fc34caaa | 2349 | DBG2("UST app create channel %s for PID %d completed", ua_chan->name, |
852d0037 | 2350 | app->pid); |
fc34caaa | 2351 | |
d0b96690 DG |
2352 | /* Only add the channel if successful on the tracer side. */ |
2353 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
2354 | ||
fc34caaa | 2355 | end: |
4d710ac2 DG |
2356 | if (ua_chanp) { |
2357 | *ua_chanp = ua_chan; | |
2358 | } | |
2359 | ||
2360 | /* Everything went well. */ | |
2361 | return 0; | |
5b4a0ec0 DG |
2362 | |
2363 | error: | |
d0b96690 | 2364 | delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app); |
4d710ac2 | 2365 | return ret; |
5b4a0ec0 DG |
2366 | } |
2367 | ||
2368 | /* | |
2369 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
2370 | * |
2371 | * Called with ust app session mutex held. | |
5b4a0ec0 | 2372 | */ |
edb67388 DG |
2373 | static |
2374 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
2375 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
2376 | struct ust_app *app) | |
284d8f55 | 2377 | { |
edb67388 | 2378 | int ret = 0; |
5b4a0ec0 | 2379 | struct ust_app_event *ua_event; |
284d8f55 | 2380 | |
5b4a0ec0 | 2381 | /* Get event node */ |
18eace3b DG |
2382 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
2383 | uevent->filter, uevent->attr.loglevel); | |
2384 | if (ua_event != NULL) { | |
fc34caaa | 2385 | ret = -EEXIST; |
edb67388 DG |
2386 | goto end; |
2387 | } | |
5b4a0ec0 | 2388 | |
edb67388 DG |
2389 | /* Does not exist so create one */ |
2390 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); | |
2391 | if (ua_event == NULL) { | |
2392 | /* Only malloc can failed so something is really wrong */ | |
2393 | ret = -ENOMEM; | |
fc34caaa | 2394 | goto end; |
5b4a0ec0 | 2395 | } |
edb67388 | 2396 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 2397 | |
edb67388 | 2398 | /* Create it on the tracer side */ |
5b4a0ec0 | 2399 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 2400 | if (ret < 0) { |
fc34caaa | 2401 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 2402 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
2403 | goto error; |
2404 | } | |
2405 | ||
d0b96690 | 2406 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 2407 | |
fc34caaa | 2408 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 2409 | app->pid); |
7f79d3a1 | 2410 | |
edb67388 | 2411 | end: |
fc34caaa DG |
2412 | return ret; |
2413 | ||
5b4a0ec0 | 2414 | error: |
fc34caaa DG |
2415 | /* Valid. Calling here is already in a read side lock */ |
2416 | delete_ust_app_event(-1, ua_event); | |
edb67388 | 2417 | return ret; |
5b4a0ec0 DG |
2418 | } |
2419 | ||
2420 | /* | |
2421 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 2422 | * |
7972aab2 | 2423 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
2424 | */ |
2425 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
d65d2de8 DG |
2426 | struct ust_app *app, struct consumer_output *consumer, |
2427 | struct ustctl_consumer_channel_attr *attr) | |
5b4a0ec0 DG |
2428 | { |
2429 | int ret = 0; | |
ffe60014 | 2430 | struct ust_app_channel *metadata; |
d88aee68 | 2431 | struct consumer_socket *socket; |
7972aab2 | 2432 | struct ust_registry_session *registry; |
5b4a0ec0 | 2433 | |
ffe60014 DG |
2434 | assert(ua_sess); |
2435 | assert(app); | |
d88aee68 | 2436 | assert(consumer); |
5b4a0ec0 | 2437 | |
7972aab2 DG |
2438 | registry = get_session_registry(ua_sess); |
2439 | assert(registry); | |
2440 | ||
2441 | /* Metadata already exists for this registry. */ | |
2442 | if (registry->metadata_key) { | |
2443 | ret = 0; | |
2444 | goto error; | |
5b4a0ec0 DG |
2445 | } |
2446 | ||
ffe60014 | 2447 | /* Allocate UST metadata */ |
d0b96690 | 2448 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
2449 | if (!metadata) { |
2450 | /* malloc() failed */ | |
2451 | ret = -ENOMEM; | |
2452 | goto error; | |
2453 | } | |
5b4a0ec0 | 2454 | |
d65d2de8 DG |
2455 | if (!attr) { |
2456 | /* Set default attributes for metadata. */ | |
2457 | metadata->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
2458 | metadata->attr.subbuf_size = default_get_metadata_subbuf_size(); | |
2459 | metadata->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM; | |
2460 | metadata->attr.switch_timer_interval = DEFAULT_UST_CHANNEL_SWITCH_TIMER; | |
2461 | metadata->attr.read_timer_interval = DEFAULT_UST_CHANNEL_READ_TIMER; | |
2462 | metadata->attr.output = LTTNG_UST_MMAP; | |
2463 | metadata->attr.type = LTTNG_UST_CHAN_METADATA; | |
2464 | } else { | |
2465 | memcpy(&metadata->attr, attr, sizeof(metadata->attr)); | |
2466 | metadata->attr.output = LTTNG_UST_MMAP; | |
2467 | metadata->attr.type = LTTNG_UST_CHAN_METADATA; | |
2468 | } | |
5b4a0ec0 | 2469 | |
d88aee68 | 2470 | /* Get the right consumer socket for the application. */ |
7972aab2 | 2471 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); |
d88aee68 DG |
2472 | if (!socket) { |
2473 | ret = -EINVAL; | |
2474 | goto error_consumer; | |
2475 | } | |
2476 | ||
7972aab2 DG |
2477 | /* Need one fd for the channel. */ |
2478 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2479 | if (ret < 0) { | |
2480 | ERR("Exhausted number of available FD upon create metadata"); | |
2481 | goto error; | |
2482 | } | |
2483 | ||
d88aee68 DG |
2484 | /* |
2485 | * Ask the metadata channel creation to the consumer. The metadata object | |
2486 | * will be created by the consumer and kept their. However, the stream is | |
2487 | * never added or monitored until we do a first push metadata to the | |
2488 | * consumer. | |
2489 | */ | |
7972aab2 DG |
2490 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
2491 | registry); | |
d88aee68 | 2492 | if (ret < 0) { |
7972aab2 DG |
2493 | /* |
2494 | * Safe because the metadata obj pointer is not set so the delete below | |
2495 | * will not put a FD back again. | |
2496 | */ | |
2497 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
d88aee68 DG |
2498 | goto error_consumer; |
2499 | } | |
2500 | ||
2501 | /* | |
2502 | * The setup command will make the metadata stream be sent to the relayd, | |
2503 | * if applicable, and the thread managing the metadatas. This is important | |
2504 | * because after this point, if an error occurs, the only way the stream | |
2505 | * can be deleted is to be monitored in the consumer. | |
2506 | */ | |
7972aab2 | 2507 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 2508 | if (ret < 0) { |
7972aab2 DG |
2509 | /* |
2510 | * Safe because the metadata obj pointer is not set so the delete below | |
2511 | * will not put a FD back again. | |
2512 | */ | |
2513 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
d88aee68 | 2514 | goto error_consumer; |
5b4a0ec0 DG |
2515 | } |
2516 | ||
7972aab2 DG |
2517 | /* Keep metadata key so we can identify it on the consumer side. */ |
2518 | registry->metadata_key = metadata->key; | |
ffe60014 | 2519 | |
7972aab2 DG |
2520 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
2521 | metadata->key, app->pid); | |
5b4a0ec0 | 2522 | |
d88aee68 DG |
2523 | error_consumer: |
2524 | delete_ust_app_channel(-1, metadata, app); | |
5b4a0ec0 | 2525 | error: |
ffe60014 | 2526 | return ret; |
5b4a0ec0 DG |
2527 | } |
2528 | ||
2529 | /* | |
2530 | * Return pointer to traceable apps list. | |
2531 | */ | |
bec39940 | 2532 | struct lttng_ht *ust_app_get_ht(void) |
5b4a0ec0 DG |
2533 | { |
2534 | return ust_app_ht; | |
2535 | } | |
2536 | ||
2537 | /* | |
d88aee68 DG |
2538 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
2539 | * acquired before calling this function. | |
5b4a0ec0 DG |
2540 | */ |
2541 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
2542 | { | |
d88aee68 | 2543 | struct ust_app *app = NULL; |
bec39940 DG |
2544 | struct lttng_ht_node_ulong *node; |
2545 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 2546 | |
bec39940 DG |
2547 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
2548 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
2549 | if (node == NULL) { |
2550 | DBG2("UST app no found with pid %d", pid); | |
2551 | goto error; | |
2552 | } | |
5b4a0ec0 DG |
2553 | |
2554 | DBG2("Found UST app by pid %d", pid); | |
2555 | ||
d88aee68 | 2556 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
2557 | |
2558 | error: | |
d88aee68 | 2559 | return app; |
5b4a0ec0 DG |
2560 | } |
2561 | ||
d88aee68 DG |
2562 | /* |
2563 | * Allocate and init an UST app object using the registration information and | |
2564 | * the command socket. This is called when the command socket connects to the | |
2565 | * session daemon. | |
2566 | * | |
2567 | * The object is returned on success or else NULL. | |
2568 | */ | |
d0b96690 | 2569 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 2570 | { |
d0b96690 DG |
2571 | struct ust_app *lta = NULL; |
2572 | ||
2573 | assert(msg); | |
2574 | assert(sock >= 0); | |
2575 | ||
2576 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 2577 | |
173af62f DG |
2578 | if ((msg->bits_per_long == 64 && |
2579 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
2580 | || (msg->bits_per_long == 32 && | |
2581 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 2582 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
2583 | "%d-bit long, but no consumerd for this size is available.\n", |
2584 | msg->name, msg->pid, msg->bits_per_long); | |
2585 | goto error; | |
3f2c5fcc | 2586 | } |
d0b96690 | 2587 | |
5b4a0ec0 DG |
2588 | lta = zmalloc(sizeof(struct ust_app)); |
2589 | if (lta == NULL) { | |
2590 | PERROR("malloc"); | |
d0b96690 | 2591 | goto error; |
5b4a0ec0 DG |
2592 | } |
2593 | ||
2594 | lta->ppid = msg->ppid; | |
2595 | lta->uid = msg->uid; | |
2596 | lta->gid = msg->gid; | |
d0b96690 | 2597 | |
7753dea8 | 2598 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
2599 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
2600 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
2601 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
2602 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
2603 | lta->long_alignment = msg->long_alignment; | |
2604 | lta->byte_order = msg->byte_order; | |
2605 | ||
5b4a0ec0 DG |
2606 | lta->v_major = msg->major; |
2607 | lta->v_minor = msg->minor; | |
bec39940 | 2608 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 DG |
2609 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
2610 | lta->notify_sock = -1; | |
d88aee68 DG |
2611 | |
2612 | /* Copy name and make sure it's NULL terminated. */ | |
2613 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
2614 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
2615 | ||
2616 | /* | |
2617 | * Before this can be called, when receiving the registration information, | |
2618 | * the application compatibility is checked. So, at this point, the | |
2619 | * application can work with this session daemon. | |
2620 | */ | |
d0b96690 | 2621 | lta->compatible = 1; |
5b4a0ec0 | 2622 | |
852d0037 | 2623 | lta->pid = msg->pid; |
d0b96690 | 2624 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 2625 | lta->sock = sock; |
d0b96690 | 2626 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 2627 | |
d42f20df DG |
2628 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
2629 | ||
d0b96690 DG |
2630 | error: |
2631 | return lta; | |
2632 | } | |
2633 | ||
d88aee68 DG |
2634 | /* |
2635 | * For a given application object, add it to every hash table. | |
2636 | */ | |
d0b96690 DG |
2637 | void ust_app_add(struct ust_app *app) |
2638 | { | |
2639 | assert(app); | |
2640 | assert(app->notify_sock >= 0); | |
2641 | ||
5b4a0ec0 | 2642 | rcu_read_lock(); |
852d0037 DG |
2643 | |
2644 | /* | |
2645 | * On a re-registration, we want to kick out the previous registration of | |
2646 | * that pid | |
2647 | */ | |
d0b96690 | 2648 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
2649 | |
2650 | /* | |
2651 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
2652 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
2653 | * already in the table. | |
2654 | */ | |
d0b96690 | 2655 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 2656 | |
d0b96690 DG |
2657 | /* Add application to the notify socket hash table. */ |
2658 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
2659 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 2660 | |
d0b96690 | 2661 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
2662 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
2663 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
2664 | app->v_minor); | |
5b4a0ec0 | 2665 | |
d0b96690 DG |
2666 | rcu_read_unlock(); |
2667 | } | |
2668 | ||
d88aee68 DG |
2669 | /* |
2670 | * Set the application version into the object. | |
2671 | * | |
2672 | * Return 0 on success else a negative value either an errno code or a | |
2673 | * LTTng-UST error code. | |
2674 | */ | |
d0b96690 DG |
2675 | int ust_app_version(struct ust_app *app) |
2676 | { | |
d88aee68 DG |
2677 | int ret; |
2678 | ||
d0b96690 | 2679 | assert(app); |
d88aee68 DG |
2680 | |
2681 | ret = ustctl_tracer_version(app->sock, &app->version); | |
2682 | if (ret < 0) { | |
2683 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
2684 | ERR("UST app %d verson failed with ret %d", app->sock, ret); | |
2685 | } else { | |
2686 | DBG3("UST app %d verion failed. Application is dead", app->sock); | |
2687 | } | |
2688 | } | |
2689 | ||
2690 | return ret; | |
5b4a0ec0 DG |
2691 | } |
2692 | ||
2693 | /* | |
2694 | * Unregister app by removing it from the global traceable app list and freeing | |
2695 | * the data struct. | |
2696 | * | |
2697 | * The socket is already closed at this point so no close to sock. | |
2698 | */ | |
2699 | void ust_app_unregister(int sock) | |
2700 | { | |
2701 | struct ust_app *lta; | |
bec39940 DG |
2702 | struct lttng_ht_node_ulong *node; |
2703 | struct lttng_ht_iter iter; | |
d42f20df | 2704 | struct ust_app_session *ua_sess; |
525b0740 | 2705 | int ret; |
5b4a0ec0 DG |
2706 | |
2707 | rcu_read_lock(); | |
886459c6 | 2708 | |
5b4a0ec0 | 2709 | /* Get the node reference for a call_rcu */ |
852d0037 | 2710 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 2711 | node = lttng_ht_iter_get_node_ulong(&iter); |
d0b96690 | 2712 | assert(node); |
284d8f55 | 2713 | |
852d0037 | 2714 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
2715 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
2716 | ||
886459c6 | 2717 | /* Remove application from PID hash table */ |
852d0037 DG |
2718 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
2719 | assert(!ret); | |
2720 | ||
d88aee68 DG |
2721 | /* |
2722 | * Remove application from notify hash table. The thread handling the | |
2723 | * notify socket could have deleted the node so ignore on error because | |
2724 | * either way it's valid. The close of that socket is handled by the other | |
2725 | * thread. | |
2726 | */ | |
d0b96690 | 2727 | iter.iter.node = <a->notify_sock_n.node; |
d88aee68 | 2728 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); |
852d0037 | 2729 | |
5b98a774 DG |
2730 | /* |
2731 | * Ignore return value since the node might have been removed before by an | |
2732 | * add replace during app registration because the PID can be reassigned by | |
2733 | * the OS. | |
2734 | */ | |
d0b96690 | 2735 | iter.iter.node = <a->pid_n.node; |
bec39940 | 2736 | ret = lttng_ht_del(ust_app_ht, &iter); |
5b98a774 DG |
2737 | if (ret) { |
2738 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
2739 | lta->pid); | |
2740 | } | |
852d0037 | 2741 | |
d42f20df DG |
2742 | /* Remove sessions so they are not visible during deletion.*/ |
2743 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, | |
2744 | node.node) { | |
7972aab2 DG |
2745 | struct ust_registry_session *registry; |
2746 | ||
d42f20df DG |
2747 | ret = lttng_ht_del(lta->sessions, &iter); |
2748 | if (ret) { | |
2749 | /* The session was already removed so scheduled for teardown. */ | |
2750 | continue; | |
2751 | } | |
2752 | ||
2753 | /* | |
2754 | * Add session to list for teardown. This is safe since at this point we | |
2755 | * are the only one using this list. | |
2756 | */ | |
d88aee68 DG |
2757 | pthread_mutex_lock(&ua_sess->lock); |
2758 | ||
2759 | /* | |
2760 | * Normally, this is done in the delete session process which is | |
2761 | * executed in the call rcu below. However, upon registration we can't | |
2762 | * afford to wait for the grace period before pushing data or else the | |
2763 | * data pending feature can race between the unregistration and stop | |
2764 | * command where the data pending command is sent *before* the grace | |
2765 | * period ended. | |
2766 | * | |
2767 | * The close metadata below nullifies the metadata pointer in the | |
2768 | * session so the delete session will NOT push/close a second time. | |
2769 | */ | |
7972aab2 DG |
2770 | registry = get_session_registry(ua_sess); |
2771 | if (registry) { | |
2772 | /* Push metadata for application before freeing the application. */ | |
2773 | (void) push_metadata(registry, ua_sess->consumer); | |
2774 | ||
2775 | /* | |
2776 | * Don't ask to close metadata for global per UID buffers. Close | |
2777 | * metadata only on destroy trace session in this case. | |
2778 | */ | |
2779 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { | |
2780 | /* And ask to close it for this session registry. */ | |
2781 | (void) close_metadata(registry, ua_sess->consumer); | |
2782 | } | |
2783 | } | |
d88aee68 | 2784 | |
d42f20df | 2785 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
d88aee68 | 2786 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
2787 | } |
2788 | ||
852d0037 DG |
2789 | /* Free memory */ |
2790 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
2791 | ||
5b4a0ec0 DG |
2792 | rcu_read_unlock(); |
2793 | return; | |
284d8f55 DG |
2794 | } |
2795 | ||
2796 | /* | |
5b4a0ec0 | 2797 | * Return traceable_app_count |
284d8f55 | 2798 | */ |
5b4a0ec0 | 2799 | unsigned long ust_app_list_count(void) |
284d8f55 | 2800 | { |
5b4a0ec0 | 2801 | unsigned long count; |
284d8f55 | 2802 | |
5b4a0ec0 | 2803 | rcu_read_lock(); |
bec39940 | 2804 | count = lttng_ht_get_count(ust_app_ht); |
5b4a0ec0 | 2805 | rcu_read_unlock(); |
284d8f55 | 2806 | |
5b4a0ec0 | 2807 | return count; |
284d8f55 DG |
2808 | } |
2809 | ||
5b4a0ec0 DG |
2810 | /* |
2811 | * Fill events array with all events name of all registered apps. | |
2812 | */ | |
2813 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 2814 | { |
5b4a0ec0 DG |
2815 | int ret, handle; |
2816 | size_t nbmem, count = 0; | |
bec39940 | 2817 | struct lttng_ht_iter iter; |
5b4a0ec0 | 2818 | struct ust_app *app; |
c617c0c6 | 2819 | struct lttng_event *tmp_event; |
421cb601 | 2820 | |
5b4a0ec0 | 2821 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
2822 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
2823 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
2824 | PERROR("zmalloc ust app events"); |
2825 | ret = -ENOMEM; | |
421cb601 DG |
2826 | goto error; |
2827 | } | |
2828 | ||
5b4a0ec0 | 2829 | rcu_read_lock(); |
421cb601 | 2830 | |
852d0037 | 2831 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 2832 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 2833 | |
840cb59c | 2834 | health_code_update(); |
86acf0da | 2835 | |
e0c7ec2b DG |
2836 | if (!app->compatible) { |
2837 | /* | |
2838 | * TODO: In time, we should notice the caller of this error by | |
2839 | * telling him that this is a version error. | |
2840 | */ | |
2841 | continue; | |
2842 | } | |
852d0037 | 2843 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 2844 | if (handle < 0) { |
ffe60014 DG |
2845 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
2846 | ERR("UST app list events getting handle failed for app pid %d", | |
2847 | app->pid); | |
2848 | } | |
5b4a0ec0 DG |
2849 | continue; |
2850 | } | |
421cb601 | 2851 | |
852d0037 | 2852 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 2853 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
2854 | /* Handle ustctl error. */ |
2855 | if (ret < 0) { | |
2856 | free(tmp_event); | |
2857 | if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) { | |
2858 | ERR("UST app tp list get failed for app %d with ret %d", | |
2859 | app->sock, ret); | |
2860 | } else { | |
2861 | DBG3("UST app tp list get failed. Application is dead"); | |
2862 | } | |
2863 | goto rcu_error; | |
2864 | } | |
2865 | ||
840cb59c | 2866 | health_code_update(); |
815564d8 | 2867 | if (count >= nbmem) { |
d7b3776f | 2868 | /* In case the realloc fails, we free the memory */ |
c617c0c6 MD |
2869 | void *ptr; |
2870 | ||
815564d8 MD |
2871 | DBG2("Reallocating event list from %zu to %zu entries", nbmem, |
2872 | 2 * nbmem); | |
2873 | nbmem *= 2; | |
c617c0c6 MD |
2874 | ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event)); |
2875 | if (ptr == NULL) { | |
5b4a0ec0 | 2876 | PERROR("realloc ust app events"); |
c617c0c6 | 2877 | free(tmp_event); |
5b4a0ec0 DG |
2878 | ret = -ENOMEM; |
2879 | goto rcu_error; | |
2880 | } | |
c617c0c6 | 2881 | tmp_event = ptr; |
5b4a0ec0 | 2882 | } |
c617c0c6 MD |
2883 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
2884 | tmp_event[count].loglevel = uiter.loglevel; | |
2885 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
2886 | tmp_event[count].pid = app->pid; | |
2887 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 2888 | count++; |
421cb601 | 2889 | } |
421cb601 DG |
2890 | } |
2891 | ||
5b4a0ec0 | 2892 | ret = count; |
c617c0c6 | 2893 | *events = tmp_event; |
421cb601 | 2894 | |
5b4a0ec0 | 2895 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 2896 | |
5b4a0ec0 DG |
2897 | rcu_error: |
2898 | rcu_read_unlock(); | |
421cb601 | 2899 | error: |
840cb59c | 2900 | health_code_update(); |
5b4a0ec0 | 2901 | return ret; |
421cb601 DG |
2902 | } |
2903 | ||
f37d259d MD |
2904 | /* |
2905 | * Fill events array with all events name of all registered apps. | |
2906 | */ | |
2907 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
2908 | { | |
2909 | int ret, handle; | |
2910 | size_t nbmem, count = 0; | |
2911 | struct lttng_ht_iter iter; | |
2912 | struct ust_app *app; | |
c617c0c6 | 2913 | struct lttng_event_field *tmp_event; |
f37d259d MD |
2914 | |
2915 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
2916 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
2917 | if (tmp_event == NULL) { | |
f37d259d MD |
2918 | PERROR("zmalloc ust app event fields"); |
2919 | ret = -ENOMEM; | |
2920 | goto error; | |
2921 | } | |
2922 | ||
2923 | rcu_read_lock(); | |
2924 | ||
2925 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
2926 | struct lttng_ust_field_iter uiter; | |
2927 | ||
840cb59c | 2928 | health_code_update(); |
86acf0da | 2929 | |
f37d259d MD |
2930 | if (!app->compatible) { |
2931 | /* | |
2932 | * TODO: In time, we should notice the caller of this error by | |
2933 | * telling him that this is a version error. | |
2934 | */ | |
2935 | continue; | |
2936 | } | |
2937 | handle = ustctl_tracepoint_field_list(app->sock); | |
2938 | if (handle < 0) { | |
ffe60014 DG |
2939 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
2940 | ERR("UST app list field getting handle failed for app pid %d", | |
2941 | app->pid); | |
2942 | } | |
f37d259d MD |
2943 | continue; |
2944 | } | |
2945 | ||
2946 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 2947 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
2948 | /* Handle ustctl error. */ |
2949 | if (ret < 0) { | |
2950 | free(tmp_event); | |
2951 | if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) { | |
2952 | ERR("UST app tp list field failed for app %d with ret %d", | |
2953 | app->sock, ret); | |
2954 | } else { | |
2955 | DBG3("UST app tp list field failed. Application is dead"); | |
2956 | } | |
2957 | goto rcu_error; | |
2958 | } | |
2959 | ||
840cb59c | 2960 | health_code_update(); |
f37d259d | 2961 | if (count >= nbmem) { |
d7b3776f | 2962 | /* In case the realloc fails, we free the memory */ |
c617c0c6 MD |
2963 | void *ptr; |
2964 | ||
f37d259d MD |
2965 | DBG2("Reallocating event field list from %zu to %zu entries", nbmem, |
2966 | 2 * nbmem); | |
2967 | nbmem *= 2; | |
c617c0c6 MD |
2968 | ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event_field)); |
2969 | if (ptr == NULL) { | |
f37d259d | 2970 | PERROR("realloc ust app event fields"); |
c617c0c6 | 2971 | free(tmp_event); |
f37d259d MD |
2972 | ret = -ENOMEM; |
2973 | goto rcu_error; | |
2974 | } | |
c617c0c6 | 2975 | tmp_event = ptr; |
f37d259d | 2976 | } |
f37d259d | 2977 | |
c617c0c6 MD |
2978 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
2979 | tmp_event[count].type = uiter.type; | |
2980 | tmp_event[count].nowrite = uiter.nowrite; | |
f37d259d | 2981 | |
c617c0c6 MD |
2982 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
2983 | tmp_event[count].event.loglevel = uiter.loglevel; | |
2984 | tmp_event[count].event.type = LTTNG_UST_TRACEPOINT; | |
2985 | tmp_event[count].event.pid = app->pid; | |
2986 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
2987 | count++; |
2988 | } | |
2989 | } | |
2990 | ||
2991 | ret = count; | |
c617c0c6 | 2992 | *fields = tmp_event; |
f37d259d MD |
2993 | |
2994 | DBG2("UST app list event fields done (%zu events)", count); | |
2995 | ||
2996 | rcu_error: | |
2997 | rcu_read_unlock(); | |
2998 | error: | |
840cb59c | 2999 | health_code_update(); |
f37d259d MD |
3000 | return ret; |
3001 | } | |
3002 | ||
5b4a0ec0 DG |
3003 | /* |
3004 | * Free and clean all traceable apps of the global list. | |
3005 | */ | |
3006 | void ust_app_clean_list(void) | |
421cb601 | 3007 | { |
5b4a0ec0 | 3008 | int ret; |
659ed79f | 3009 | struct ust_app *app; |
bec39940 | 3010 | struct lttng_ht_iter iter; |
421cb601 | 3011 | |
5b4a0ec0 | 3012 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3013 | |
5b4a0ec0 | 3014 | rcu_read_lock(); |
421cb601 | 3015 | |
659ed79f | 3016 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3017 | ret = lttng_ht_del(ust_app_ht, &iter); |
525b0740 | 3018 | assert(!ret); |
659ed79f | 3019 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); |
421cb601 DG |
3020 | } |
3021 | ||
852d0037 | 3022 | /* Cleanup socket hash table */ |
659ed79f DG |
3023 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, |
3024 | sock_n.node) { | |
852d0037 | 3025 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
bec39940 DG |
3026 | assert(!ret); |
3027 | } | |
852d0037 | 3028 | |
d88aee68 DG |
3029 | /* Cleanup notify socket hash table */ |
3030 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3031 | notify_sock_n.node) { | |
3032 | ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3033 | assert(!ret); | |
3034 | } | |
3035 | ||
bec39940 | 3036 | /* Destroy is done only when the ht is empty */ |
852d0037 DG |
3037 | lttng_ht_destroy(ust_app_ht); |
3038 | lttng_ht_destroy(ust_app_ht_by_sock); | |
d88aee68 | 3039 | lttng_ht_destroy(ust_app_ht_by_notify_sock); |
421cb601 | 3040 | |
5b4a0ec0 DG |
3041 | rcu_read_unlock(); |
3042 | } | |
3043 | ||
3044 | /* | |
3045 | * Init UST app hash table. | |
3046 | */ | |
3047 | void ust_app_ht_alloc(void) | |
3048 | { | |
bec39940 | 3049 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
852d0037 | 3050 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3051 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
421cb601 DG |
3052 | } |
3053 | ||
78f0bacd DG |
3054 | /* |
3055 | * For a specific UST session, disable the channel for all registered apps. | |
3056 | */ | |
35a9059d | 3057 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3058 | struct ltt_ust_channel *uchan) |
3059 | { | |
3060 | int ret = 0; | |
bec39940 DG |
3061 | struct lttng_ht_iter iter; |
3062 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3063 | struct ust_app *app; |
3064 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3065 | struct ust_app_channel *ua_chan; |
78f0bacd DG |
3066 | |
3067 | if (usess == NULL || uchan == NULL) { | |
3068 | ERR("Disabling UST global channel with NULL values"); | |
3069 | ret = -1; | |
3070 | goto error; | |
3071 | } | |
3072 | ||
a991f516 MD |
3073 | DBG2("UST app disabling channel %s from global domain for session id %d", |
3074 | uchan->name, usess->id); | |
78f0bacd DG |
3075 | |
3076 | rcu_read_lock(); | |
3077 | ||
3078 | /* For every registered applications */ | |
852d0037 | 3079 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3080 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3081 | if (!app->compatible) { |
3082 | /* | |
3083 | * TODO: In time, we should notice the caller of this error by | |
3084 | * telling him that this is a version error. | |
3085 | */ | |
3086 | continue; | |
3087 | } | |
78f0bacd DG |
3088 | ua_sess = lookup_session_by_app(usess, app); |
3089 | if (ua_sess == NULL) { | |
3090 | continue; | |
3091 | } | |
3092 | ||
8535a6d9 | 3093 | /* Get channel */ |
bec39940 DG |
3094 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3095 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
3096 | /* If the session if found for the app, the channel must be there */ |
3097 | assert(ua_chan_node); | |
3098 | ||
3099 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3100 | /* The channel must not be already disabled */ | |
3101 | assert(ua_chan->enabled == 1); | |
3102 | ||
3103 | /* Disable channel onto application */ | |
3104 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
3105 | if (ret < 0) { |
3106 | /* XXX: We might want to report this error at some point... */ | |
3107 | continue; | |
3108 | } | |
3109 | } | |
3110 | ||
3111 | rcu_read_unlock(); | |
3112 | ||
3113 | error: | |
3114 | return ret; | |
3115 | } | |
3116 | ||
3117 | /* | |
3118 | * For a specific UST session, enable the channel for all registered apps. | |
3119 | */ | |
35a9059d | 3120 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3121 | struct ltt_ust_channel *uchan) |
3122 | { | |
3123 | int ret = 0; | |
bec39940 | 3124 | struct lttng_ht_iter iter; |
78f0bacd DG |
3125 | struct ust_app *app; |
3126 | struct ust_app_session *ua_sess; | |
3127 | ||
3128 | if (usess == NULL || uchan == NULL) { | |
3129 | ERR("Adding UST global channel to NULL values"); | |
3130 | ret = -1; | |
3131 | goto error; | |
3132 | } | |
3133 | ||
a991f516 MD |
3134 | DBG2("UST app enabling channel %s to global domain for session id %d", |
3135 | uchan->name, usess->id); | |
78f0bacd DG |
3136 | |
3137 | rcu_read_lock(); | |
3138 | ||
3139 | /* For every registered applications */ | |
852d0037 | 3140 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3141 | if (!app->compatible) { |
3142 | /* | |
3143 | * TODO: In time, we should notice the caller of this error by | |
3144 | * telling him that this is a version error. | |
3145 | */ | |
3146 | continue; | |
3147 | } | |
78f0bacd DG |
3148 | ua_sess = lookup_session_by_app(usess, app); |
3149 | if (ua_sess == NULL) { | |
3150 | continue; | |
3151 | } | |
3152 | ||
3153 | /* Enable channel onto application */ | |
3154 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
3155 | if (ret < 0) { | |
3156 | /* XXX: We might want to report this error at some point... */ | |
3157 | continue; | |
3158 | } | |
3159 | } | |
3160 | ||
3161 | rcu_read_unlock(); | |
3162 | ||
3163 | error: | |
3164 | return ret; | |
3165 | } | |
3166 | ||
b0a40d28 DG |
3167 | /* |
3168 | * Disable an event in a channel and for a specific session. | |
3169 | */ | |
35a9059d DG |
3170 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
3171 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
3172 | { |
3173 | int ret = 0; | |
bec39940 DG |
3174 | struct lttng_ht_iter iter, uiter; |
3175 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
b0a40d28 DG |
3176 | struct ust_app *app; |
3177 | struct ust_app_session *ua_sess; | |
3178 | struct ust_app_channel *ua_chan; | |
3179 | struct ust_app_event *ua_event; | |
3180 | ||
3181 | DBG("UST app disabling event %s for all apps in channel " | |
a991f516 | 3182 | "%s for session id %d", uevent->attr.name, uchan->name, usess->id); |
b0a40d28 DG |
3183 | |
3184 | rcu_read_lock(); | |
3185 | ||
3186 | /* For all registered applications */ | |
852d0037 | 3187 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3188 | if (!app->compatible) { |
3189 | /* | |
3190 | * TODO: In time, we should notice the caller of this error by | |
3191 | * telling him that this is a version error. | |
3192 | */ | |
3193 | continue; | |
3194 | } | |
b0a40d28 DG |
3195 | ua_sess = lookup_session_by_app(usess, app); |
3196 | if (ua_sess == NULL) { | |
3197 | /* Next app */ | |
3198 | continue; | |
3199 | } | |
3200 | ||
3201 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3202 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3203 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 3204 | if (ua_chan_node == NULL) { |
a991f516 | 3205 | DBG2("Channel %s not found in session id %d for app pid %d." |
852d0037 | 3206 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
3207 | continue; |
3208 | } | |
3209 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3210 | ||
bec39940 DG |
3211 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter); |
3212 | ua_event_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 DG |
3213 | if (ua_event_node == NULL) { |
3214 | DBG2("Event %s not found in channel %s for app pid %d." | |
852d0037 | 3215 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
3216 | continue; |
3217 | } | |
3218 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
3219 | ||
7f79d3a1 | 3220 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
3221 | if (ret < 0) { |
3222 | /* XXX: Report error someday... */ | |
3223 | continue; | |
3224 | } | |
3225 | } | |
3226 | ||
3227 | rcu_read_unlock(); | |
3228 | ||
3229 | return ret; | |
3230 | } | |
3231 | ||
9730260e | 3232 | /* |
edb67388 | 3233 | * For a specific UST session and UST channel, the event for all |
9730260e DG |
3234 | * registered apps. |
3235 | */ | |
35a9059d | 3236 | int ust_app_disable_all_event_glb(struct ltt_ust_session *usess, |
9730260e DG |
3237 | struct ltt_ust_channel *uchan) |
3238 | { | |
3239 | int ret = 0; | |
bec39940 DG |
3240 | struct lttng_ht_iter iter, uiter; |
3241 | struct lttng_ht_node_str *ua_chan_node; | |
9730260e DG |
3242 | struct ust_app *app; |
3243 | struct ust_app_session *ua_sess; | |
3244 | struct ust_app_channel *ua_chan; | |
3245 | struct ust_app_event *ua_event; | |
3246 | ||
3247 | DBG("UST app disabling all event for all apps in channel " | |
a991f516 | 3248 | "%s for session id %d", uchan->name, usess->id); |
9730260e DG |
3249 | |
3250 | rcu_read_lock(); | |
3251 | ||
3252 | /* For all registered applications */ | |
852d0037 | 3253 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3254 | if (!app->compatible) { |
3255 | /* | |
3256 | * TODO: In time, we should notice the caller of this error by | |
3257 | * telling him that this is a version error. | |
3258 | */ | |
3259 | continue; | |
3260 | } | |
9730260e | 3261 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3262 | if (!ua_sess) { |
3263 | /* The application has problem or is probably dead. */ | |
3264 | continue; | |
3265 | } | |
9730260e DG |
3266 | |
3267 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3268 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3269 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3270 | /* If the channel is not found, there is a code flow error */ |
3271 | assert(ua_chan_node); | |
3272 | ||
9730260e DG |
3273 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3274 | ||
3275 | /* Disable each events of channel */ | |
bec39940 DG |
3276 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
3277 | node.node) { | |
7f79d3a1 | 3278 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
9730260e DG |
3279 | if (ret < 0) { |
3280 | /* XXX: Report error someday... */ | |
3281 | continue; | |
3282 | } | |
3283 | } | |
3284 | } | |
3285 | ||
3286 | rcu_read_unlock(); | |
3287 | ||
3288 | return ret; | |
3289 | } | |
3290 | ||
421cb601 | 3291 | /* |
5b4a0ec0 | 3292 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 3293 | */ |
35a9059d | 3294 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3295 | struct ltt_ust_channel *uchan) |
3296 | { | |
3d8ca23b | 3297 | int ret = 0, created; |
bec39940 | 3298 | struct lttng_ht_iter iter; |
48842b30 | 3299 | struct ust_app *app; |
3d8ca23b | 3300 | struct ust_app_session *ua_sess = NULL; |
48842b30 | 3301 | |
fc34caaa DG |
3302 | /* Very wrong code flow */ |
3303 | assert(usess); | |
3304 | assert(uchan); | |
421cb601 | 3305 | |
7972aab2 | 3306 | DBG2("UST app adding channel %s to UST domain for session id %d", |
a991f516 | 3307 | uchan->name, usess->id); |
48842b30 DG |
3308 | |
3309 | rcu_read_lock(); | |
421cb601 | 3310 | |
5b4a0ec0 | 3311 | /* For every registered applications */ |
852d0037 | 3312 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3313 | if (!app->compatible) { |
3314 | /* | |
3315 | * TODO: In time, we should notice the caller of this error by | |
3316 | * telling him that this is a version error. | |
3317 | */ | |
3318 | continue; | |
3319 | } | |
edb67388 DG |
3320 | /* |
3321 | * Create session on the tracer side and add it to app session HT. Note | |
3322 | * that if session exist, it will simply return a pointer to the ust | |
3323 | * app session. | |
3324 | */ | |
3d8ca23b DG |
3325 | ret = create_ust_app_session(usess, app, &ua_sess, &created); |
3326 | if (ret < 0) { | |
3327 | switch (ret) { | |
3328 | case -ENOTCONN: | |
3329 | /* | |
3330 | * The application's socket is not valid. Either a bad socket | |
3331 | * or a timeout on it. We can't inform the caller that for a | |
3332 | * specific app, the session failed so lets continue here. | |
3333 | */ | |
3334 | continue; | |
3335 | case -ENOMEM: | |
3336 | default: | |
3337 | goto error_rcu_unlock; | |
3338 | } | |
48842b30 | 3339 | } |
3d8ca23b | 3340 | assert(ua_sess); |
48842b30 | 3341 | |
d0b96690 | 3342 | pthread_mutex_lock(&ua_sess->lock); |
d65d2de8 DG |
3343 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, |
3344 | sizeof(uchan->name))) { | |
3345 | struct ustctl_consumer_channel_attr attr; | |
3346 | copy_channel_attr_to_ustctl(&attr, &uchan->attr); | |
3347 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, | |
3348 | &attr); | |
3349 | } else { | |
3350 | /* Create channel onto application. We don't need the chan ref. */ | |
3351 | ret = create_ust_app_channel(ua_sess, uchan, app, | |
3352 | LTTNG_UST_CHAN_PER_CPU, usess, NULL); | |
3353 | } | |
d0b96690 | 3354 | pthread_mutex_unlock(&ua_sess->lock); |
3d8ca23b DG |
3355 | if (ret < 0) { |
3356 | if (ret == -ENOMEM) { | |
3357 | /* No more memory is a fatal error. Stop right now. */ | |
3358 | goto error_rcu_unlock; | |
3359 | } | |
3360 | /* Cleanup the created session if it's the case. */ | |
3361 | if (created) { | |
d0b96690 | 3362 | destroy_app_session(app, ua_sess); |
3d8ca23b | 3363 | } |
48842b30 | 3364 | } |
48842b30 | 3365 | } |
5b4a0ec0 | 3366 | |
95e047ff | 3367 | error_rcu_unlock: |
48842b30 | 3368 | rcu_read_unlock(); |
3c14c33f | 3369 | return ret; |
48842b30 DG |
3370 | } |
3371 | ||
5b4a0ec0 | 3372 | /* |
edb67388 | 3373 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 3374 | */ |
35a9059d | 3375 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3376 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3377 | { | |
3378 | int ret = 0; | |
bec39940 | 3379 | struct lttng_ht_iter iter, uiter; |
18eace3b | 3380 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
3381 | struct ust_app *app; |
3382 | struct ust_app_session *ua_sess; | |
3383 | struct ust_app_channel *ua_chan; | |
3384 | struct ust_app_event *ua_event; | |
48842b30 | 3385 | |
a991f516 MD |
3386 | DBG("UST app enabling event %s for all apps for session id %d", |
3387 | uevent->attr.name, usess->id); | |
48842b30 | 3388 | |
edb67388 DG |
3389 | /* |
3390 | * NOTE: At this point, this function is called only if the session and | |
3391 | * channel passed are already created for all apps. and enabled on the | |
3392 | * tracer also. | |
3393 | */ | |
3394 | ||
48842b30 | 3395 | rcu_read_lock(); |
421cb601 DG |
3396 | |
3397 | /* For all registered applications */ | |
852d0037 | 3398 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3399 | if (!app->compatible) { |
3400 | /* | |
3401 | * TODO: In time, we should notice the caller of this error by | |
3402 | * telling him that this is a version error. | |
3403 | */ | |
3404 | continue; | |
3405 | } | |
edb67388 | 3406 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3407 | if (!ua_sess) { |
3408 | /* The application has problem or is probably dead. */ | |
3409 | continue; | |
3410 | } | |
ba767faf | 3411 | |
d0b96690 DG |
3412 | pthread_mutex_lock(&ua_sess->lock); |
3413 | ||
edb67388 | 3414 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3415 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3416 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3417 | /* If the channel is not found, there is a code flow error */ |
3418 | assert(ua_chan_node); | |
3419 | ||
3420 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3421 | ||
18eace3b DG |
3422 | /* Get event node */ |
3423 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
3424 | uevent->filter, uevent->attr.loglevel); | |
3425 | if (ua_event == NULL) { | |
7f79d3a1 | 3426 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 3427 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 3428 | goto next_app; |
35a9059d | 3429 | } |
35a9059d DG |
3430 | |
3431 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
3432 | if (ret < 0) { | |
d0b96690 | 3433 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 3434 | goto error; |
48842b30 | 3435 | } |
d0b96690 DG |
3436 | next_app: |
3437 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
3438 | } |
3439 | ||
7f79d3a1 | 3440 | error: |
edb67388 | 3441 | rcu_read_unlock(); |
edb67388 DG |
3442 | return ret; |
3443 | } | |
3444 | ||
3445 | /* | |
3446 | * For a specific existing UST session and UST channel, creates the event for | |
3447 | * all registered apps. | |
3448 | */ | |
35a9059d | 3449 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
3450 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3451 | { | |
3452 | int ret = 0; | |
bec39940 DG |
3453 | struct lttng_ht_iter iter, uiter; |
3454 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
3455 | struct ust_app *app; |
3456 | struct ust_app_session *ua_sess; | |
3457 | struct ust_app_channel *ua_chan; | |
3458 | ||
a991f516 MD |
3459 | DBG("UST app creating event %s for all apps for session id %d", |
3460 | uevent->attr.name, usess->id); | |
edb67388 | 3461 | |
edb67388 DG |
3462 | rcu_read_lock(); |
3463 | ||
3464 | /* For all registered applications */ | |
852d0037 | 3465 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3466 | if (!app->compatible) { |
3467 | /* | |
3468 | * TODO: In time, we should notice the caller of this error by | |
3469 | * telling him that this is a version error. | |
3470 | */ | |
3471 | continue; | |
3472 | } | |
edb67388 | 3473 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3474 | if (!ua_sess) { |
3475 | /* The application has problem or is probably dead. */ | |
3476 | continue; | |
3477 | } | |
48842b30 | 3478 | |
d0b96690 | 3479 | pthread_mutex_lock(&ua_sess->lock); |
48842b30 | 3480 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3481 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3482 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3483 | /* If the channel is not found, there is a code flow error */ |
3484 | assert(ua_chan_node); | |
3485 | ||
48842b30 DG |
3486 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3487 | ||
edb67388 | 3488 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 3489 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 3490 | if (ret < 0) { |
49c336c1 | 3491 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
3492 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
3493 | break; | |
3494 | } | |
3495 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 3496 | uevent->attr.name, app->pid); |
5b4a0ec0 | 3497 | continue; |
48842b30 | 3498 | } |
48842b30 | 3499 | } |
5b4a0ec0 | 3500 | |
48842b30 DG |
3501 | rcu_read_unlock(); |
3502 | ||
3503 | return ret; | |
3504 | } | |
3505 | ||
5b4a0ec0 DG |
3506 | /* |
3507 | * Start tracing for a specific UST session and app. | |
3508 | */ | |
421cb601 | 3509 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
3510 | { |
3511 | int ret = 0; | |
48842b30 | 3512 | struct ust_app_session *ua_sess; |
48842b30 | 3513 | |
852d0037 | 3514 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 3515 | |
509cbaf8 MD |
3516 | rcu_read_lock(); |
3517 | ||
e0c7ec2b DG |
3518 | if (!app->compatible) { |
3519 | goto end; | |
3520 | } | |
3521 | ||
421cb601 DG |
3522 | ua_sess = lookup_session_by_app(usess, app); |
3523 | if (ua_sess == NULL) { | |
d42f20df DG |
3524 | /* The session is in teardown process. Ignore and continue. */ |
3525 | goto end; | |
421cb601 | 3526 | } |
48842b30 | 3527 | |
d0b96690 DG |
3528 | pthread_mutex_lock(&ua_sess->lock); |
3529 | ||
aea829b3 DG |
3530 | /* Upon restart, we skip the setup, already done */ |
3531 | if (ua_sess->started) { | |
8be98f9a | 3532 | goto skip_setup; |
aea829b3 | 3533 | } |
8be98f9a | 3534 | |
a4b92340 DG |
3535 | /* Create directories if consumer is LOCAL and has a path defined. */ |
3536 | if (usess->consumer->type == CONSUMER_DST_LOCAL && | |
3537 | strlen(usess->consumer->dst.trace_path) > 0) { | |
3538 | ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path, | |
7972aab2 | 3539 | S_IRWXU | S_IRWXG, ua_sess->euid, ua_sess->egid); |
a4b92340 DG |
3540 | if (ret < 0) { |
3541 | if (ret != -EEXIST) { | |
3542 | ERR("Trace directory creation error"); | |
d0b96690 | 3543 | goto error_unlock; |
421cb601 | 3544 | } |
173af62f | 3545 | } |
7753dea8 | 3546 | } |
aea829b3 | 3547 | |
d65d2de8 DG |
3548 | /* |
3549 | * Create the metadata for the application. This returns gracefully if a | |
3550 | * metadata was already set for the session. | |
3551 | */ | |
3552 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, NULL); | |
421cb601 | 3553 | if (ret < 0) { |
d0b96690 | 3554 | goto error_unlock; |
421cb601 | 3555 | } |
48842b30 | 3556 | |
840cb59c | 3557 | health_code_update(); |
86acf0da | 3558 | |
8be98f9a | 3559 | skip_setup: |
421cb601 | 3560 | /* This start the UST tracing */ |
852d0037 | 3561 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
421cb601 | 3562 | if (ret < 0) { |
ffe60014 DG |
3563 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3564 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
3565 | app->pid, ret); | |
3566 | } else { | |
3567 | DBG("UST app start session failed. Application is dead."); | |
3568 | } | |
d0b96690 | 3569 | goto error_unlock; |
421cb601 | 3570 | } |
5b4a0ec0 | 3571 | |
55c3953d DG |
3572 | /* Indicate that the session has been started once */ |
3573 | ua_sess->started = 1; | |
3574 | ||
d0b96690 DG |
3575 | pthread_mutex_unlock(&ua_sess->lock); |
3576 | ||
840cb59c | 3577 | health_code_update(); |
86acf0da | 3578 | |
421cb601 | 3579 | /* Quiescent wait after starting trace */ |
ffe60014 DG |
3580 | ret = ustctl_wait_quiescent(app->sock); |
3581 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3582 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3583 | app->pid, ret); | |
3584 | } | |
48842b30 | 3585 | |
e0c7ec2b DG |
3586 | end: |
3587 | rcu_read_unlock(); | |
840cb59c | 3588 | health_code_update(); |
421cb601 | 3589 | return 0; |
48842b30 | 3590 | |
d0b96690 DG |
3591 | error_unlock: |
3592 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 3593 | rcu_read_unlock(); |
840cb59c | 3594 | health_code_update(); |
421cb601 DG |
3595 | return -1; |
3596 | } | |
48842b30 | 3597 | |
8be98f9a MD |
3598 | /* |
3599 | * Stop tracing for a specific UST session and app. | |
3600 | */ | |
3601 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) | |
3602 | { | |
3603 | int ret = 0; | |
bec39940 | 3604 | struct lttng_ht_iter iter; |
8be98f9a | 3605 | struct ust_app_session *ua_sess; |
6d3686da | 3606 | struct ust_app_channel *ua_chan; |
7972aab2 | 3607 | struct ust_registry_session *registry; |
8be98f9a | 3608 | |
852d0037 | 3609 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
3610 | |
3611 | rcu_read_lock(); | |
3612 | ||
e0c7ec2b | 3613 | if (!app->compatible) { |
d88aee68 | 3614 | goto end_no_session; |
e0c7ec2b DG |
3615 | } |
3616 | ||
8be98f9a MD |
3617 | ua_sess = lookup_session_by_app(usess, app); |
3618 | if (ua_sess == NULL) { | |
d88aee68 | 3619 | goto end_no_session; |
8be98f9a MD |
3620 | } |
3621 | ||
d88aee68 DG |
3622 | pthread_mutex_lock(&ua_sess->lock); |
3623 | ||
9bc07046 DG |
3624 | /* |
3625 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
3626 | * that was never started. It's possible since we can have a fail start |
3627 | * from either the application manager thread or the command thread. Simply | |
3628 | * indicate that this is a stop error. | |
9bc07046 | 3629 | */ |
f9dfc3d9 | 3630 | if (!ua_sess->started) { |
c45536e1 DG |
3631 | goto error_rcu_unlock; |
3632 | } | |
7db205b5 | 3633 | |
840cb59c | 3634 | health_code_update(); |
86acf0da | 3635 | |
9d6c7d3f | 3636 | /* This inhibits UST tracing */ |
852d0037 | 3637 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
9d6c7d3f | 3638 | if (ret < 0) { |
ffe60014 DG |
3639 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3640 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
3641 | app->pid, ret); | |
3642 | } else { | |
3643 | DBG("UST app stop session failed. Application is dead."); | |
3644 | } | |
9d6c7d3f DG |
3645 | goto error_rcu_unlock; |
3646 | } | |
3647 | ||
840cb59c | 3648 | health_code_update(); |
86acf0da | 3649 | |
9d6c7d3f | 3650 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
3651 | ret = ustctl_wait_quiescent(app->sock); |
3652 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3653 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3654 | app->pid, ret); | |
3655 | } | |
9d6c7d3f | 3656 | |
840cb59c | 3657 | health_code_update(); |
86acf0da | 3658 | |
9d6c7d3f | 3659 | /* Flushing buffers */ |
bec39940 DG |
3660 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
3661 | node.node) { | |
840cb59c | 3662 | health_code_update(); |
ffe60014 | 3663 | assert(ua_chan->is_sent); |
852d0037 | 3664 | ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj); |
8be98f9a | 3665 | if (ret < 0) { |
ffe60014 DG |
3666 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3667 | ERR("UST app PID %d channel %s flush failed with ret %d", | |
3668 | app->pid, ua_chan->name, ret); | |
3669 | } else { | |
3670 | DBG3("UST app failed to flush %s. Application is dead.", | |
3671 | ua_chan->name); | |
3672 | /* No need to continue. */ | |
d88aee68 | 3673 | break; |
ffe60014 | 3674 | } |
6d3686da DG |
3675 | /* Continuing flushing all buffers */ |
3676 | continue; | |
8be98f9a MD |
3677 | } |
3678 | } | |
8be98f9a | 3679 | |
840cb59c | 3680 | health_code_update(); |
86acf0da | 3681 | |
7972aab2 DG |
3682 | registry = get_session_registry(ua_sess); |
3683 | assert(registry); | |
3684 | /* Push metadata for application before freeing the application. */ | |
3685 | (void) push_metadata(registry, ua_sess->consumer); | |
90d97d10 | 3686 | |
d88aee68 DG |
3687 | pthread_mutex_unlock(&ua_sess->lock); |
3688 | end_no_session: | |
7db205b5 | 3689 | rcu_read_unlock(); |
840cb59c | 3690 | health_code_update(); |
8be98f9a MD |
3691 | return 0; |
3692 | ||
3693 | error_rcu_unlock: | |
d88aee68 | 3694 | pthread_mutex_unlock(&ua_sess->lock); |
8be98f9a | 3695 | rcu_read_unlock(); |
840cb59c | 3696 | health_code_update(); |
8be98f9a MD |
3697 | return -1; |
3698 | } | |
3699 | ||
84cd17c6 MD |
3700 | /* |
3701 | * Destroy a specific UST session in apps. | |
3702 | */ | |
3353de95 | 3703 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 3704 | { |
ffe60014 | 3705 | int ret; |
84cd17c6 | 3706 | struct ust_app_session *ua_sess; |
bec39940 DG |
3707 | struct lttng_ht_iter iter; |
3708 | struct lttng_ht_node_ulong *node; | |
84cd17c6 | 3709 | |
852d0037 | 3710 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
3711 | |
3712 | rcu_read_lock(); | |
3713 | ||
e0c7ec2b DG |
3714 | if (!app->compatible) { |
3715 | goto end; | |
3716 | } | |
3717 | ||
84cd17c6 | 3718 | __lookup_session_by_app(usess, app, &iter); |
bec39940 | 3719 | node = lttng_ht_iter_get_node_ulong(&iter); |
84cd17c6 | 3720 | if (node == NULL) { |
d42f20df DG |
3721 | /* Session is being or is deleted. */ |
3722 | goto end; | |
84cd17c6 MD |
3723 | } |
3724 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 3725 | |
840cb59c | 3726 | health_code_update(); |
d0b96690 | 3727 | destroy_app_session(app, ua_sess); |
84cd17c6 | 3728 | |
840cb59c | 3729 | health_code_update(); |
7db205b5 | 3730 | |
84cd17c6 | 3731 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
3732 | ret = ustctl_wait_quiescent(app->sock); |
3733 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3734 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3735 | app->pid, ret); | |
3736 | } | |
e0c7ec2b DG |
3737 | end: |
3738 | rcu_read_unlock(); | |
840cb59c | 3739 | health_code_update(); |
84cd17c6 | 3740 | return 0; |
84cd17c6 MD |
3741 | } |
3742 | ||
5b4a0ec0 DG |
3743 | /* |
3744 | * Start tracing for the UST session. | |
3745 | */ | |
421cb601 DG |
3746 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
3747 | { | |
3748 | int ret = 0; | |
bec39940 | 3749 | struct lttng_ht_iter iter; |
421cb601 | 3750 | struct ust_app *app; |
48842b30 | 3751 | |
421cb601 DG |
3752 | DBG("Starting all UST traces"); |
3753 | ||
3754 | rcu_read_lock(); | |
421cb601 | 3755 | |
852d0037 | 3756 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
421cb601 | 3757 | ret = ust_app_start_trace(usess, app); |
48842b30 | 3758 | if (ret < 0) { |
5b4a0ec0 DG |
3759 | /* Continue to next apps even on error */ |
3760 | continue; | |
48842b30 | 3761 | } |
48842b30 | 3762 | } |
5b4a0ec0 | 3763 | |
48842b30 DG |
3764 | rcu_read_unlock(); |
3765 | ||
3766 | return 0; | |
3767 | } | |
487cf67c | 3768 | |
8be98f9a MD |
3769 | /* |
3770 | * Start tracing for the UST session. | |
3771 | */ | |
3772 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
3773 | { | |
3774 | int ret = 0; | |
bec39940 | 3775 | struct lttng_ht_iter iter; |
8be98f9a MD |
3776 | struct ust_app *app; |
3777 | ||
3778 | DBG("Stopping all UST traces"); | |
3779 | ||
3780 | rcu_read_lock(); | |
3781 | ||
7972aab2 DG |
3782 | /* Flush all per UID buffers associated to that session. */ |
3783 | if (usess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
3784 | struct buffer_reg_uid *reg; | |
3785 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
3786 | struct buffer_reg_channel *reg_chan; | |
3787 | struct consumer_socket *socket; | |
3788 | ||
3789 | /* Get consumer socket to use to push the metadata.*/ | |
3790 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
3791 | usess->consumer); | |
3792 | if (!socket) { | |
3793 | /* Ignore request if no consumer is found for the session. */ | |
3794 | continue; | |
3795 | } | |
3796 | ||
3797 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
3798 | reg_chan, node.node) { | |
3799 | /* | |
3800 | * The following call will print error values so the return | |
3801 | * code is of little importance because whatever happens, we | |
3802 | * have to try them all. | |
3803 | */ | |
3804 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
3805 | } | |
3806 | } | |
3807 | } | |
3808 | ||
852d0037 | 3809 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
8be98f9a MD |
3810 | ret = ust_app_stop_trace(usess, app); |
3811 | if (ret < 0) { | |
3812 | /* Continue to next apps even on error */ | |
3813 | continue; | |
3814 | } | |
3815 | } | |
3816 | ||
3817 | rcu_read_unlock(); | |
3818 | ||
3819 | return 0; | |
3820 | } | |
3821 | ||
84cd17c6 MD |
3822 | /* |
3823 | * Destroy app UST session. | |
3824 | */ | |
3825 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
3826 | { | |
3827 | int ret = 0; | |
bec39940 | 3828 | struct lttng_ht_iter iter; |
84cd17c6 MD |
3829 | struct ust_app *app; |
3830 | ||
3831 | DBG("Destroy all UST traces"); | |
3832 | ||
3833 | rcu_read_lock(); | |
3834 | ||
852d0037 | 3835 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 3836 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
3837 | if (ret < 0) { |
3838 | /* Continue to next apps even on error */ | |
3839 | continue; | |
3840 | } | |
3841 | } | |
3842 | ||
3843 | rcu_read_unlock(); | |
3844 | ||
3845 | return 0; | |
3846 | } | |
3847 | ||
5b4a0ec0 DG |
3848 | /* |
3849 | * Add channels/events from UST global domain to registered apps at sock. | |
3850 | */ | |
487cf67c DG |
3851 | void ust_app_global_update(struct ltt_ust_session *usess, int sock) |
3852 | { | |
55c54cce | 3853 | int ret = 0; |
727d5404 | 3854 | struct lttng_ht_iter iter, uiter, iter_ctx; |
487cf67c | 3855 | struct ust_app *app; |
3d8ca23b | 3856 | struct ust_app_session *ua_sess = NULL; |
487cf67c DG |
3857 | struct ust_app_channel *ua_chan; |
3858 | struct ust_app_event *ua_event; | |
727d5404 | 3859 | struct ust_app_ctx *ua_ctx; |
1f3580c7 | 3860 | |
95e047ff | 3861 | assert(usess); |
ffe60014 | 3862 | assert(sock >= 0); |
1f3580c7 | 3863 | |
a991f516 MD |
3864 | DBG2("UST app global update for app sock %d for session id %d", sock, |
3865 | usess->id); | |
487cf67c | 3866 | |
284d8f55 DG |
3867 | rcu_read_lock(); |
3868 | ||
487cf67c DG |
3869 | app = find_app_by_sock(sock); |
3870 | if (app == NULL) { | |
d88aee68 DG |
3871 | /* |
3872 | * Application can be unregistered before so this is possible hence | |
3873 | * simply stopping the update. | |
3874 | */ | |
3875 | DBG3("UST app update failed to find app sock %d", sock); | |
487cf67c DG |
3876 | goto error; |
3877 | } | |
3878 | ||
e0c7ec2b DG |
3879 | if (!app->compatible) { |
3880 | goto error; | |
3881 | } | |
3882 | ||
3d8ca23b DG |
3883 | ret = create_ust_app_session(usess, app, &ua_sess, NULL); |
3884 | if (ret < 0) { | |
3885 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
3886 | goto error; |
3887 | } | |
3d8ca23b | 3888 | assert(ua_sess); |
487cf67c | 3889 | |
d0b96690 DG |
3890 | pthread_mutex_lock(&ua_sess->lock); |
3891 | ||
284d8f55 | 3892 | /* |
d0b96690 | 3893 | * We can iterate safely here over all UST app session since the create ust |
284d8f55 DG |
3894 | * app session above made a shadow copy of the UST global domain from the |
3895 | * ltt ust session. | |
3896 | */ | |
bec39940 DG |
3897 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
3898 | node.node) { | |
d65d2de8 DG |
3899 | /* |
3900 | * For a metadata channel, handle it differently. | |
3901 | */ | |
3902 | if (!strncmp(ua_chan->name, DEFAULT_METADATA_NAME, | |
3903 | sizeof(ua_chan->name))) { | |
3904 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, | |
3905 | &ua_chan->attr); | |
c7a339aa DG |
3906 | if (ret < 0) { |
3907 | goto error_unlock; | |
3908 | } | |
d65d2de8 DG |
3909 | /* Remove it from the hash table and continue!. */ |
3910 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
3911 | assert(!ret); | |
3912 | delete_ust_app_channel(-1, ua_chan, app); | |
3913 | continue; | |
3914 | } else { | |
3915 | ret = do_create_channel(app, usess, ua_sess, ua_chan); | |
c7a339aa DG |
3916 | if (ret < 0) { |
3917 | /* | |
3918 | * Stop everything. On error, the application failed, no more | |
3919 | * file descriptor are available or ENOMEM so stopping here is | |
3920 | * the only thing we can do for now. | |
3921 | */ | |
3922 | goto error_unlock; | |
3923 | } | |
487cf67c DG |
3924 | } |
3925 | ||
727d5404 DG |
3926 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter_ctx.iter, ua_ctx, |
3927 | node.node) { | |
3928 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
3929 | if (ret < 0) { | |
d0b96690 | 3930 | goto error_unlock; |
727d5404 DG |
3931 | } |
3932 | } | |
3933 | ||
3934 | ||
284d8f55 | 3935 | /* For each events */ |
bec39940 DG |
3936 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
3937 | node.node) { | |
284d8f55 DG |
3938 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
3939 | if (ret < 0) { | |
d0b96690 | 3940 | goto error_unlock; |
487cf67c | 3941 | } |
36dc12cc | 3942 | } |
487cf67c DG |
3943 | } |
3944 | ||
d0b96690 DG |
3945 | pthread_mutex_unlock(&ua_sess->lock); |
3946 | ||
36dc12cc | 3947 | if (usess->start_trace) { |
421cb601 | 3948 | ret = ust_app_start_trace(usess, app); |
36dc12cc | 3949 | if (ret < 0) { |
36dc12cc DG |
3950 | goto error; |
3951 | } | |
3952 | ||
852d0037 | 3953 | DBG2("UST trace started for app pid %d", app->pid); |
36dc12cc DG |
3954 | } |
3955 | ||
ffe60014 DG |
3956 | /* Everything went well at this point. */ |
3957 | rcu_read_unlock(); | |
3958 | return; | |
3959 | ||
d0b96690 DG |
3960 | error_unlock: |
3961 | pthread_mutex_unlock(&ua_sess->lock); | |
487cf67c | 3962 | error: |
ffe60014 | 3963 | if (ua_sess) { |
d0b96690 | 3964 | destroy_app_session(app, ua_sess); |
ffe60014 | 3965 | } |
487cf67c DG |
3966 | rcu_read_unlock(); |
3967 | return; | |
3968 | } | |
55cc08a6 DG |
3969 | |
3970 | /* | |
3971 | * Add context to a specific channel for global UST domain. | |
3972 | */ | |
3973 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
3974 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
3975 | { | |
3976 | int ret = 0; | |
bec39940 DG |
3977 | struct lttng_ht_node_str *ua_chan_node; |
3978 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
3979 | struct ust_app_channel *ua_chan = NULL; |
3980 | struct ust_app_session *ua_sess; | |
3981 | struct ust_app *app; | |
3982 | ||
3983 | rcu_read_lock(); | |
3984 | ||
852d0037 | 3985 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3986 | if (!app->compatible) { |
3987 | /* | |
3988 | * TODO: In time, we should notice the caller of this error by | |
3989 | * telling him that this is a version error. | |
3990 | */ | |
3991 | continue; | |
3992 | } | |
55cc08a6 DG |
3993 | ua_sess = lookup_session_by_app(usess, app); |
3994 | if (ua_sess == NULL) { | |
3995 | continue; | |
3996 | } | |
3997 | ||
d0b96690 | 3998 | pthread_mutex_lock(&ua_sess->lock); |
55cc08a6 | 3999 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4000 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4001 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 4002 | if (ua_chan_node == NULL) { |
d0b96690 | 4003 | goto next_app; |
55cc08a6 DG |
4004 | } |
4005 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
4006 | node); | |
55cc08a6 DG |
4007 | ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app); |
4008 | if (ret < 0) { | |
d0b96690 | 4009 | goto next_app; |
55cc08a6 | 4010 | } |
d0b96690 DG |
4011 | next_app: |
4012 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
4013 | } |
4014 | ||
55cc08a6 DG |
4015 | rcu_read_unlock(); |
4016 | return ret; | |
4017 | } | |
4018 | ||
76d45b40 DG |
4019 | /* |
4020 | * Enable event for a channel from a UST session for a specific PID. | |
4021 | */ | |
4022 | int ust_app_enable_event_pid(struct ltt_ust_session *usess, | |
4023 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4024 | { | |
4025 | int ret = 0; | |
bec39940 | 4026 | struct lttng_ht_iter iter; |
18eace3b | 4027 | struct lttng_ht_node_str *ua_chan_node; |
76d45b40 DG |
4028 | struct ust_app *app; |
4029 | struct ust_app_session *ua_sess; | |
4030 | struct ust_app_channel *ua_chan; | |
4031 | struct ust_app_event *ua_event; | |
4032 | ||
4033 | DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid); | |
4034 | ||
4035 | rcu_read_lock(); | |
4036 | ||
4037 | app = ust_app_find_by_pid(pid); | |
4038 | if (app == NULL) { | |
4039 | ERR("UST app enable event per PID %d not found", pid); | |
4040 | ret = -1; | |
d0b96690 | 4041 | goto end; |
76d45b40 DG |
4042 | } |
4043 | ||
e0c7ec2b DG |
4044 | if (!app->compatible) { |
4045 | ret = 0; | |
d0b96690 | 4046 | goto end; |
e0c7ec2b DG |
4047 | } |
4048 | ||
76d45b40 | 4049 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4050 | if (!ua_sess) { |
4051 | /* The application has problem or is probably dead. */ | |
d0b96690 DG |
4052 | ret = 0; |
4053 | goto end; | |
c4a1715b | 4054 | } |
76d45b40 | 4055 | |
d0b96690 | 4056 | pthread_mutex_lock(&ua_sess->lock); |
76d45b40 | 4057 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4058 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4059 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
76d45b40 DG |
4060 | /* If the channel is not found, there is a code flow error */ |
4061 | assert(ua_chan_node); | |
4062 | ||
4063 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4064 | ||
18eace3b DG |
4065 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
4066 | uevent->filter, uevent->attr.loglevel); | |
4067 | if (ua_event == NULL) { | |
76d45b40 DG |
4068 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
4069 | if (ret < 0) { | |
d0b96690 | 4070 | goto end_unlock; |
76d45b40 DG |
4071 | } |
4072 | } else { | |
76d45b40 DG |
4073 | ret = enable_ust_app_event(ua_sess, ua_event, app); |
4074 | if (ret < 0) { | |
d0b96690 | 4075 | goto end_unlock; |
76d45b40 DG |
4076 | } |
4077 | } | |
4078 | ||
d0b96690 DG |
4079 | end_unlock: |
4080 | pthread_mutex_unlock(&ua_sess->lock); | |
4081 | end: | |
76d45b40 DG |
4082 | rcu_read_unlock(); |
4083 | return ret; | |
4084 | } | |
7f79d3a1 DG |
4085 | |
4086 | /* | |
4087 | * Disable event for a channel from a UST session for a specific PID. | |
4088 | */ | |
4089 | int ust_app_disable_event_pid(struct ltt_ust_session *usess, | |
4090 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4091 | { | |
4092 | int ret = 0; | |
bec39940 DG |
4093 | struct lttng_ht_iter iter; |
4094 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
7f79d3a1 DG |
4095 | struct ust_app *app; |
4096 | struct ust_app_session *ua_sess; | |
4097 | struct ust_app_channel *ua_chan; | |
4098 | struct ust_app_event *ua_event; | |
4099 | ||
4100 | DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid); | |
4101 | ||
4102 | rcu_read_lock(); | |
4103 | ||
4104 | app = ust_app_find_by_pid(pid); | |
4105 | if (app == NULL) { | |
4106 | ERR("UST app disable event per PID %d not found", pid); | |
4107 | ret = -1; | |
4108 | goto error; | |
4109 | } | |
4110 | ||
e0c7ec2b DG |
4111 | if (!app->compatible) { |
4112 | ret = 0; | |
4113 | goto error; | |
4114 | } | |
4115 | ||
7f79d3a1 | 4116 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4117 | if (!ua_sess) { |
4118 | /* The application has problem or is probably dead. */ | |
4119 | goto error; | |
4120 | } | |
7f79d3a1 DG |
4121 | |
4122 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
4123 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4124 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
7f79d3a1 DG |
4125 | if (ua_chan_node == NULL) { |
4126 | /* Channel does not exist, skip disabling */ | |
4127 | goto error; | |
4128 | } | |
4129 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4130 | ||
bec39940 DG |
4131 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter); |
4132 | ua_event_node = lttng_ht_iter_get_node_str(&iter); | |
7f79d3a1 DG |
4133 | if (ua_event_node == NULL) { |
4134 | /* Event does not exist, skip disabling */ | |
4135 | goto error; | |
4136 | } | |
4137 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
4138 | ||
4139 | ret = disable_ust_app_event(ua_sess, ua_event, app); | |
4140 | if (ret < 0) { | |
4141 | goto error; | |
4142 | } | |
4143 | ||
4144 | error: | |
4145 | rcu_read_unlock(); | |
4146 | return ret; | |
4147 | } | |
e0c7ec2b | 4148 | |
4466912f DG |
4149 | /* |
4150 | * Calibrate registered applications. | |
4151 | */ | |
4152 | int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate) | |
4153 | { | |
4154 | int ret = 0; | |
4155 | struct lttng_ht_iter iter; | |
4156 | struct ust_app *app; | |
4157 | ||
4158 | rcu_read_lock(); | |
4159 | ||
852d0037 | 4160 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4466912f DG |
4161 | if (!app->compatible) { |
4162 | /* | |
4163 | * TODO: In time, we should notice the caller of this error by | |
4164 | * telling him that this is a version error. | |
4165 | */ | |
4166 | continue; | |
4167 | } | |
4168 | ||
840cb59c | 4169 | health_code_update(); |
86acf0da | 4170 | |
852d0037 | 4171 | ret = ustctl_calibrate(app->sock, calibrate); |
4466912f DG |
4172 | if (ret < 0) { |
4173 | switch (ret) { | |
4174 | case -ENOSYS: | |
4175 | /* Means that it's not implemented on the tracer side. */ | |
4176 | ret = 0; | |
4177 | break; | |
4178 | default: | |
4466912f | 4179 | DBG2("Calibrate app PID %d returned with error %d", |
852d0037 | 4180 | app->pid, ret); |
4466912f DG |
4181 | break; |
4182 | } | |
4183 | } | |
4184 | } | |
4185 | ||
4186 | DBG("UST app global domain calibration finished"); | |
4187 | ||
4188 | rcu_read_unlock(); | |
4189 | ||
840cb59c | 4190 | health_code_update(); |
86acf0da | 4191 | |
4466912f DG |
4192 | return ret; |
4193 | } | |
d0b96690 DG |
4194 | |
4195 | /* | |
4196 | * Receive registration and populate the given msg structure. | |
4197 | * | |
4198 | * On success return 0 else a negative value returned by the ustctl call. | |
4199 | */ | |
4200 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
4201 | { | |
4202 | int ret; | |
4203 | uint32_t pid, ppid, uid, gid; | |
4204 | ||
4205 | assert(msg); | |
4206 | ||
4207 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
4208 | &pid, &ppid, &uid, &gid, | |
4209 | &msg->bits_per_long, | |
4210 | &msg->uint8_t_alignment, | |
4211 | &msg->uint16_t_alignment, | |
4212 | &msg->uint32_t_alignment, | |
4213 | &msg->uint64_t_alignment, | |
4214 | &msg->long_alignment, | |
4215 | &msg->byte_order, | |
4216 | msg->name); | |
4217 | if (ret < 0) { | |
4218 | switch (-ret) { | |
4219 | case EPIPE: | |
4220 | case ECONNRESET: | |
4221 | case LTTNG_UST_ERR_EXITING: | |
4222 | DBG3("UST app recv reg message failed. Application died"); | |
4223 | break; | |
4224 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
4225 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
4226 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
4227 | LTTNG_UST_ABI_MINOR_VERSION); | |
4228 | break; | |
4229 | default: | |
4230 | ERR("UST app recv reg message failed with ret %d", ret); | |
4231 | break; | |
4232 | } | |
4233 | goto error; | |
4234 | } | |
4235 | msg->pid = (pid_t) pid; | |
4236 | msg->ppid = (pid_t) ppid; | |
4237 | msg->uid = (uid_t) uid; | |
4238 | msg->gid = (gid_t) gid; | |
4239 | ||
4240 | error: | |
4241 | return ret; | |
4242 | } | |
4243 | ||
d88aee68 DG |
4244 | /* |
4245 | * Return a ust app channel object using the application object and the channel | |
4246 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
4247 | * lock MUST be acquired before calling this function. | |
4248 | */ | |
d0b96690 DG |
4249 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
4250 | int objd) | |
4251 | { | |
4252 | struct lttng_ht_node_ulong *node; | |
4253 | struct lttng_ht_iter iter; | |
4254 | struct ust_app_channel *ua_chan = NULL; | |
4255 | ||
4256 | assert(app); | |
4257 | ||
4258 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
4259 | node = lttng_ht_iter_get_node_ulong(&iter); | |
4260 | if (node == NULL) { | |
4261 | DBG2("UST app channel find by objd %d not found", objd); | |
4262 | goto error; | |
4263 | } | |
4264 | ||
4265 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
4266 | ||
4267 | error: | |
4268 | return ua_chan; | |
4269 | } | |
4270 | ||
d88aee68 DG |
4271 | /* |
4272 | * Reply to a register channel notification from an application on the notify | |
4273 | * socket. The channel metadata is also created. | |
4274 | * | |
4275 | * The session UST registry lock is acquired in this function. | |
4276 | * | |
4277 | * On success 0 is returned else a negative value. | |
4278 | */ | |
d0b96690 DG |
4279 | static int reply_ust_register_channel(int sock, int sobjd, int cobjd, |
4280 | size_t nr_fields, struct ustctl_field *fields) | |
4281 | { | |
4282 | int ret, ret_code = 0; | |
4283 | uint32_t chan_id, reg_count; | |
7972aab2 | 4284 | uint64_t chan_reg_key; |
d0b96690 DG |
4285 | enum ustctl_channel_header type; |
4286 | struct ust_app *app; | |
4287 | struct ust_app_channel *ua_chan; | |
4288 | struct ust_app_session *ua_sess; | |
7972aab2 | 4289 | struct ust_registry_session *registry; |
45893984 | 4290 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
4291 | |
4292 | rcu_read_lock(); | |
4293 | ||
4294 | /* Lookup application. If not found, there is a code flow error. */ | |
4295 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4296 | if (!app) { |
4297 | DBG("Application socket %d is being teardown. Abort event notify", | |
4298 | sock); | |
4299 | ret = 0; | |
4300 | goto error_rcu_unlock; | |
4301 | } | |
d0b96690 DG |
4302 | |
4303 | /* Lookup channel by UST object descriptor. Should always be found. */ | |
4304 | ua_chan = find_channel_by_objd(app, cobjd); | |
4305 | assert(ua_chan); | |
4306 | assert(ua_chan->session); | |
4307 | ua_sess = ua_chan->session; | |
d0b96690 | 4308 | |
7972aab2 DG |
4309 | /* Get right session registry depending on the session buffer type. */ |
4310 | registry = get_session_registry(ua_sess); | |
4311 | assert(registry); | |
45893984 | 4312 | |
7972aab2 DG |
4313 | /* Depending on the buffer type, a different channel key is used. */ |
4314 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4315 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 4316 | } else { |
7972aab2 | 4317 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
4318 | } |
4319 | ||
7972aab2 DG |
4320 | pthread_mutex_lock(®istry->lock); |
4321 | ||
4322 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
4323 | assert(chan_reg); | |
4324 | ||
4325 | if (!chan_reg->register_done) { | |
4326 | reg_count = ust_registry_get_event_count(chan_reg); | |
4327 | if (reg_count < 31) { | |
4328 | type = USTCTL_CHANNEL_HEADER_COMPACT; | |
4329 | } else { | |
4330 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
4331 | } | |
4332 | ||
4333 | chan_reg->nr_ctx_fields = nr_fields; | |
4334 | chan_reg->ctx_fields = fields; | |
4335 | chan_reg->header_type = type; | |
d0b96690 | 4336 | } else { |
7972aab2 DG |
4337 | /* Get current already assigned values. */ |
4338 | type = chan_reg->header_type; | |
d0b96690 | 4339 | } |
7972aab2 DG |
4340 | /* Channel id is set during the object creation. */ |
4341 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
4342 | |
4343 | /* Append to metadata */ | |
7972aab2 DG |
4344 | if (!chan_reg->metadata_dumped) { |
4345 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
4346 | if (ret_code) { |
4347 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
4348 | goto reply; | |
4349 | } | |
4350 | } | |
4351 | ||
4352 | reply: | |
7972aab2 DG |
4353 | DBG3("UST app replying to register channel key %" PRIu64 |
4354 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
4355 | ret_code); | |
d0b96690 DG |
4356 | |
4357 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
4358 | if (ret < 0) { | |
4359 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4360 | ERR("UST app reply channel failed with ret %d", ret); | |
4361 | } else { | |
4362 | DBG3("UST app reply channel failed. Application died"); | |
4363 | } | |
4364 | goto error; | |
4365 | } | |
4366 | ||
7972aab2 DG |
4367 | /* This channel registry registration is completed. */ |
4368 | chan_reg->register_done = 1; | |
4369 | ||
d0b96690 | 4370 | error: |
7972aab2 | 4371 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4372 | error_rcu_unlock: |
d0b96690 DG |
4373 | rcu_read_unlock(); |
4374 | return ret; | |
4375 | } | |
4376 | ||
d88aee68 DG |
4377 | /* |
4378 | * Add event to the UST channel registry. When the event is added to the | |
4379 | * registry, the metadata is also created. Once done, this replies to the | |
4380 | * application with the appropriate error code. | |
4381 | * | |
4382 | * The session UST registry lock is acquired in the function. | |
4383 | * | |
4384 | * On success 0 is returned else a negative value. | |
4385 | */ | |
d0b96690 DG |
4386 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
4387 | char *sig, size_t nr_fields, struct ustctl_field *fields, int loglevel, | |
4388 | char *model_emf_uri) | |
4389 | { | |
4390 | int ret, ret_code; | |
4391 | uint32_t event_id = 0; | |
7972aab2 | 4392 | uint64_t chan_reg_key; |
d0b96690 DG |
4393 | struct ust_app *app; |
4394 | struct ust_app_channel *ua_chan; | |
4395 | struct ust_app_session *ua_sess; | |
7972aab2 | 4396 | struct ust_registry_session *registry; |
d0b96690 DG |
4397 | |
4398 | rcu_read_lock(); | |
4399 | ||
4400 | /* Lookup application. If not found, there is a code flow error. */ | |
4401 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4402 | if (!app) { |
4403 | DBG("Application socket %d is being teardown. Abort event notify", | |
4404 | sock); | |
4405 | ret = 0; | |
4406 | goto error_rcu_unlock; | |
4407 | } | |
d0b96690 DG |
4408 | |
4409 | /* Lookup channel by UST object descriptor. Should always be found. */ | |
4410 | ua_chan = find_channel_by_objd(app, cobjd); | |
4411 | assert(ua_chan); | |
4412 | assert(ua_chan->session); | |
4413 | ua_sess = ua_chan->session; | |
4414 | ||
7972aab2 DG |
4415 | registry = get_session_registry(ua_sess); |
4416 | assert(registry); | |
4417 | ||
4418 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4419 | chan_reg_key = ua_chan->tracing_channel_id; | |
4420 | } else { | |
4421 | chan_reg_key = ua_chan->key; | |
4422 | } | |
4423 | ||
4424 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 4425 | |
7972aab2 | 4426 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
45893984 | 4427 | sobjd, cobjd, name, sig, nr_fields, fields, loglevel, |
7972aab2 | 4428 | model_emf_uri, ua_sess->buffer_type, &event_id); |
d0b96690 DG |
4429 | |
4430 | /* | |
4431 | * The return value is returned to ustctl so in case of an error, the | |
4432 | * application can be notified. In case of an error, it's important not to | |
4433 | * return a negative error or else the application will get closed. | |
4434 | */ | |
4435 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
4436 | if (ret < 0) { | |
4437 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4438 | ERR("UST app reply event failed with ret %d", ret); | |
4439 | } else { | |
4440 | DBG3("UST app reply event failed. Application died"); | |
4441 | } | |
4442 | /* | |
4443 | * No need to wipe the create event since the application socket will | |
4444 | * get close on error hence cleaning up everything by itself. | |
4445 | */ | |
4446 | goto error; | |
4447 | } | |
4448 | ||
7972aab2 DG |
4449 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
4450 | name, event_id); | |
d88aee68 | 4451 | |
d0b96690 | 4452 | error: |
7972aab2 | 4453 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4454 | error_rcu_unlock: |
d0b96690 DG |
4455 | rcu_read_unlock(); |
4456 | return ret; | |
4457 | } | |
4458 | ||
d88aee68 DG |
4459 | /* |
4460 | * Handle application notification through the given notify socket. | |
4461 | * | |
4462 | * Return 0 on success or else a negative value. | |
4463 | */ | |
d0b96690 DG |
4464 | int ust_app_recv_notify(int sock) |
4465 | { | |
4466 | int ret; | |
4467 | enum ustctl_notify_cmd cmd; | |
4468 | ||
4469 | DBG3("UST app receiving notify from sock %d", sock); | |
4470 | ||
4471 | ret = ustctl_recv_notify(sock, &cmd); | |
4472 | if (ret < 0) { | |
4473 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4474 | ERR("UST app recv notify failed with ret %d", ret); | |
4475 | } else { | |
4476 | DBG3("UST app recv notify failed. Application died"); | |
4477 | } | |
4478 | goto error; | |
4479 | } | |
4480 | ||
4481 | switch (cmd) { | |
4482 | case USTCTL_NOTIFY_CMD_EVENT: | |
4483 | { | |
4484 | int sobjd, cobjd, loglevel; | |
4485 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; | |
4486 | size_t nr_fields; | |
4487 | struct ustctl_field *fields; | |
4488 | ||
4489 | DBG2("UST app ustctl register event received"); | |
4490 | ||
4491 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, &loglevel, | |
4492 | &sig, &nr_fields, &fields, &model_emf_uri); | |
4493 | if (ret < 0) { | |
4494 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4495 | ERR("UST app recv event failed with ret %d", ret); | |
4496 | } else { | |
4497 | DBG3("UST app recv event failed. Application died"); | |
4498 | } | |
4499 | goto error; | |
4500 | } | |
4501 | ||
4502 | /* Add event to the UST registry coming from the notify socket. */ | |
4503 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, | |
4504 | fields, loglevel, model_emf_uri); | |
4505 | if (ret < 0) { | |
4506 | goto error; | |
4507 | } | |
4508 | ||
4509 | break; | |
4510 | } | |
4511 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
4512 | { | |
4513 | int sobjd, cobjd; | |
4514 | size_t nr_fields; | |
4515 | struct ustctl_field *fields; | |
4516 | ||
4517 | DBG2("UST app ustctl register channel received"); | |
4518 | ||
4519 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
4520 | &fields); | |
4521 | if (ret < 0) { | |
4522 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4523 | ERR("UST app recv channel failed with ret %d", ret); | |
4524 | } else { | |
4525 | DBG3("UST app recv channel failed. Application died"); | |
4526 | } | |
4527 | goto error; | |
4528 | } | |
4529 | ||
4530 | ret = reply_ust_register_channel(sock, sobjd, cobjd, nr_fields, | |
4531 | fields); | |
4532 | if (ret < 0) { | |
4533 | goto error; | |
4534 | } | |
4535 | ||
4536 | break; | |
4537 | } | |
4538 | default: | |
4539 | /* Should NEVER happen. */ | |
4540 | assert(0); | |
4541 | } | |
4542 | ||
4543 | error: | |
4544 | return ret; | |
4545 | } | |
d88aee68 DG |
4546 | |
4547 | /* | |
4548 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
4549 | * corresponding application. On failure, the call_rcu to close the socket is | |
4550 | * executed. If an application is found, it tries to delete it from the notify | |
4551 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
4552 | * | |
4553 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
4554 | * call RCU is not done but the rest of the cleanup is. | |
4555 | */ | |
4556 | void ust_app_notify_sock_unregister(int sock) | |
4557 | { | |
4558 | int err_enomem = 0; | |
4559 | struct lttng_ht_iter iter; | |
4560 | struct ust_app *app; | |
4561 | struct ust_app_notify_sock_obj *obj; | |
4562 | ||
4563 | assert(sock >= 0); | |
4564 | ||
4565 | rcu_read_lock(); | |
4566 | ||
4567 | obj = zmalloc(sizeof(*obj)); | |
4568 | if (!obj) { | |
4569 | /* | |
4570 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
4571 | * procedure but the call_rcu will not be called. In this case, we | |
4572 | * accept the fd leak rather than possibly creating an unsynchronized | |
4573 | * state between threads. | |
4574 | * | |
4575 | * TODO: The notify object should be created once the notify socket is | |
4576 | * registered and stored independantely from the ust app object. The | |
4577 | * tricky part is to synchronize the teardown of the application and | |
4578 | * this notify object. Let's keep that in mind so we can avoid this | |
4579 | * kind of shenanigans with ENOMEM in the teardown path. | |
4580 | */ | |
4581 | err_enomem = 1; | |
4582 | } else { | |
4583 | obj->fd = sock; | |
4584 | } | |
4585 | ||
4586 | DBG("UST app notify socket unregister %d", sock); | |
4587 | ||
4588 | /* | |
4589 | * Lookup application by notify socket. If this fails, this means that the | |
4590 | * hash table delete has already been done by the application | |
4591 | * unregistration process so we can safely close the notify socket in a | |
4592 | * call RCU. | |
4593 | */ | |
4594 | app = find_app_by_notify_sock(sock); | |
4595 | if (!app) { | |
4596 | goto close_socket; | |
4597 | } | |
4598 | ||
4599 | iter.iter.node = &app->notify_sock_n.node; | |
4600 | ||
4601 | /* | |
4602 | * Whatever happens here either we fail or succeed, in both cases we have | |
4603 | * to close the socket after a grace period to continue to the call RCU | |
4604 | * here. If the deletion is successful, the application is not visible | |
4605 | * anymore by other threads and is it fails it means that it was already | |
4606 | * deleted from the hash table so either way we just have to close the | |
4607 | * socket. | |
4608 | */ | |
4609 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
4610 | ||
4611 | close_socket: | |
4612 | rcu_read_unlock(); | |
4613 | ||
4614 | /* | |
4615 | * Close socket after a grace period to avoid for the socket to be reused | |
4616 | * before the application object is freed creating potential race between | |
4617 | * threads trying to add unique in the global hash table. | |
4618 | */ | |
4619 | if (!err_enomem) { | |
4620 | call_rcu(&obj->head, close_notify_sock_rcu); | |
4621 | } | |
4622 | } |