Commit | Line | Data |
---|---|---|
91d76f53 DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
bdf64013 | 3 | * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
91d76f53 | 4 | * |
d14d33bf AM |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
91d76f53 DG |
8 | * |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
d14d33bf AM |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
91d76f53 DG |
17 | */ |
18 | ||
6c1c0768 | 19 | #define _LGPL_SOURCE |
91d76f53 | 20 | #include <errno.h> |
7972aab2 | 21 | #include <inttypes.h> |
91d76f53 DG |
22 | #include <pthread.h> |
23 | #include <stdio.h> | |
24 | #include <stdlib.h> | |
099e26bd | 25 | #include <string.h> |
aba8e916 DG |
26 | #include <sys/stat.h> |
27 | #include <sys/types.h> | |
099e26bd | 28 | #include <unistd.h> |
0df502fd | 29 | #include <urcu/compiler.h> |
fb54cdbf | 30 | #include <lttng/ust-error.h> |
331744e3 | 31 | #include <signal.h> |
bec39940 | 32 | |
990570ed | 33 | #include <common/common.h> |
86acf0da | 34 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 35 | |
7972aab2 | 36 | #include "buffer-registry.h" |
86acf0da | 37 | #include "fd-limit.h" |
8782cc74 | 38 | #include "health-sessiond.h" |
56fff090 | 39 | #include "ust-app.h" |
48842b30 | 40 | #include "ust-consumer.h" |
d80a6244 | 41 | #include "ust-ctl.h" |
0b2dc8df | 42 | #include "utils.h" |
fb83fe64 | 43 | #include "session.h" |
e9404c27 JG |
44 | #include "lttng-sessiond.h" |
45 | #include "notification-thread-commands.h" | |
5c408ad8 | 46 | #include "rotate.h" |
d80a6244 | 47 | |
c4b88406 MD |
48 | static |
49 | int ust_app_flush_app_session(struct ust_app *app, struct ust_app_session *ua_sess); | |
50 | ||
d9bf3ca4 MD |
51 | /* Next available channel key. Access under next_channel_key_lock. */ |
52 | static uint64_t _next_channel_key; | |
53 | static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER; | |
54 | ||
55 | /* Next available session ID. Access under next_session_id_lock. */ | |
56 | static uint64_t _next_session_id; | |
57 | static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER; | |
ffe60014 DG |
58 | |
59 | /* | |
d9bf3ca4 | 60 | * Return the incremented value of next_channel_key. |
ffe60014 | 61 | */ |
d9bf3ca4 | 62 | static uint64_t get_next_channel_key(void) |
ffe60014 | 63 | { |
d9bf3ca4 MD |
64 | uint64_t ret; |
65 | ||
66 | pthread_mutex_lock(&next_channel_key_lock); | |
67 | ret = ++_next_channel_key; | |
68 | pthread_mutex_unlock(&next_channel_key_lock); | |
69 | return ret; | |
ffe60014 DG |
70 | } |
71 | ||
72 | /* | |
7972aab2 | 73 | * Return the atomically incremented value of next_session_id. |
ffe60014 | 74 | */ |
d9bf3ca4 | 75 | static uint64_t get_next_session_id(void) |
ffe60014 | 76 | { |
d9bf3ca4 MD |
77 | uint64_t ret; |
78 | ||
79 | pthread_mutex_lock(&next_session_id_lock); | |
80 | ret = ++_next_session_id; | |
81 | pthread_mutex_unlock(&next_session_id_lock); | |
82 | return ret; | |
ffe60014 DG |
83 | } |
84 | ||
d65d2de8 DG |
85 | static void copy_channel_attr_to_ustctl( |
86 | struct ustctl_consumer_channel_attr *attr, | |
87 | struct lttng_ust_channel_attr *uattr) | |
88 | { | |
89 | /* Copy event attributes since the layout is different. */ | |
90 | attr->subbuf_size = uattr->subbuf_size; | |
91 | attr->num_subbuf = uattr->num_subbuf; | |
92 | attr->overwrite = uattr->overwrite; | |
93 | attr->switch_timer_interval = uattr->switch_timer_interval; | |
94 | attr->read_timer_interval = uattr->read_timer_interval; | |
95 | attr->output = uattr->output; | |
491d1539 | 96 | attr->blocking_timeout = uattr->u.s.blocking_timeout; |
d65d2de8 DG |
97 | } |
98 | ||
025faf73 DG |
99 | /* |
100 | * Match function for the hash table lookup. | |
101 | * | |
102 | * It matches an ust app event based on three attributes which are the event | |
103 | * name, the filter bytecode and the loglevel. | |
104 | */ | |
18eace3b DG |
105 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
106 | { | |
107 | struct ust_app_event *event; | |
108 | const struct ust_app_ht_key *key; | |
2106efa0 | 109 | int ev_loglevel_value; |
18eace3b DG |
110 | |
111 | assert(node); | |
112 | assert(_key); | |
113 | ||
114 | event = caa_container_of(node, struct ust_app_event, node.node); | |
115 | key = _key; | |
2106efa0 | 116 | ev_loglevel_value = event->attr.loglevel; |
18eace3b | 117 | |
1af53eb5 | 118 | /* Match the 4 elements of the key: name, filter, loglevel, exclusions */ |
18eace3b DG |
119 | |
120 | /* Event name */ | |
121 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
122 | goto no_match; | |
123 | } | |
124 | ||
125 | /* Event loglevel. */ | |
2106efa0 | 126 | if (ev_loglevel_value != key->loglevel_type) { |
025faf73 | 127 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
2106efa0 PP |
128 | && key->loglevel_type == 0 && |
129 | ev_loglevel_value == -1) { | |
025faf73 DG |
130 | /* |
131 | * Match is accepted. This is because on event creation, the | |
132 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
133 | * -1 are accepted for this loglevel type since 0 is the one set by | |
134 | * the API when receiving an enable event. | |
135 | */ | |
136 | } else { | |
137 | goto no_match; | |
138 | } | |
18eace3b DG |
139 | } |
140 | ||
141 | /* One of the filters is NULL, fail. */ | |
142 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
143 | goto no_match; | |
144 | } | |
145 | ||
025faf73 DG |
146 | if (key->filter && event->filter) { |
147 | /* Both filters exists, check length followed by the bytecode. */ | |
148 | if (event->filter->len != key->filter->len || | |
149 | memcmp(event->filter->data, key->filter->data, | |
150 | event->filter->len) != 0) { | |
151 | goto no_match; | |
152 | } | |
18eace3b DG |
153 | } |
154 | ||
1af53eb5 JI |
155 | /* One of the exclusions is NULL, fail. */ |
156 | if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) { | |
157 | goto no_match; | |
158 | } | |
159 | ||
160 | if (key->exclusion && event->exclusion) { | |
161 | /* Both exclusions exists, check count followed by the names. */ | |
162 | if (event->exclusion->count != key->exclusion->count || | |
163 | memcmp(event->exclusion->names, key->exclusion->names, | |
164 | event->exclusion->count * LTTNG_UST_SYM_NAME_LEN) != 0) { | |
165 | goto no_match; | |
166 | } | |
167 | } | |
168 | ||
169 | ||
025faf73 | 170 | /* Match. */ |
18eace3b DG |
171 | return 1; |
172 | ||
173 | no_match: | |
174 | return 0; | |
18eace3b DG |
175 | } |
176 | ||
025faf73 DG |
177 | /* |
178 | * Unique add of an ust app event in the given ht. This uses the custom | |
179 | * ht_match_ust_app_event match function and the event name as hash. | |
180 | */ | |
d0b96690 | 181 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
182 | struct ust_app_event *event) |
183 | { | |
184 | struct cds_lfht_node *node_ptr; | |
185 | struct ust_app_ht_key key; | |
d0b96690 | 186 | struct lttng_ht *ht; |
18eace3b | 187 | |
d0b96690 DG |
188 | assert(ua_chan); |
189 | assert(ua_chan->events); | |
18eace3b DG |
190 | assert(event); |
191 | ||
d0b96690 | 192 | ht = ua_chan->events; |
18eace3b DG |
193 | key.name = event->attr.name; |
194 | key.filter = event->filter; | |
2106efa0 | 195 | key.loglevel_type = event->attr.loglevel; |
91c89f23 | 196 | key.exclusion = event->exclusion; |
18eace3b DG |
197 | |
198 | node_ptr = cds_lfht_add_unique(ht->ht, | |
199 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
200 | ht_match_ust_app_event, &key, &event->node.node); | |
201 | assert(node_ptr == &event->node.node); | |
202 | } | |
203 | ||
d88aee68 DG |
204 | /* |
205 | * Close the notify socket from the given RCU head object. This MUST be called | |
206 | * through a call_rcu(). | |
207 | */ | |
208 | static void close_notify_sock_rcu(struct rcu_head *head) | |
209 | { | |
210 | int ret; | |
211 | struct ust_app_notify_sock_obj *obj = | |
212 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
213 | ||
214 | /* Must have a valid fd here. */ | |
215 | assert(obj->fd >= 0); | |
216 | ||
217 | ret = close(obj->fd); | |
218 | if (ret) { | |
219 | ERR("close notify sock %d RCU", obj->fd); | |
220 | } | |
221 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
222 | ||
223 | free(obj); | |
224 | } | |
225 | ||
7972aab2 DG |
226 | /* |
227 | * Return the session registry according to the buffer type of the given | |
228 | * session. | |
229 | * | |
230 | * A registry per UID object MUST exists before calling this function or else | |
231 | * it assert() if not found. RCU read side lock must be acquired. | |
232 | */ | |
233 | static struct ust_registry_session *get_session_registry( | |
234 | struct ust_app_session *ua_sess) | |
235 | { | |
236 | struct ust_registry_session *registry = NULL; | |
237 | ||
238 | assert(ua_sess); | |
239 | ||
240 | switch (ua_sess->buffer_type) { | |
241 | case LTTNG_BUFFER_PER_PID: | |
242 | { | |
243 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
244 | if (!reg_pid) { | |
245 | goto error; | |
246 | } | |
247 | registry = reg_pid->registry->reg.ust; | |
248 | break; | |
249 | } | |
250 | case LTTNG_BUFFER_PER_UID: | |
251 | { | |
252 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
470cc211 JG |
253 | ua_sess->tracing_id, ua_sess->bits_per_long, |
254 | ua_sess->real_credentials.uid); | |
7972aab2 DG |
255 | if (!reg_uid) { |
256 | goto error; | |
257 | } | |
258 | registry = reg_uid->registry->reg.ust; | |
259 | break; | |
260 | } | |
261 | default: | |
262 | assert(0); | |
263 | }; | |
264 | ||
265 | error: | |
266 | return registry; | |
267 | } | |
268 | ||
55cc08a6 DG |
269 | /* |
270 | * Delete ust context safely. RCU read lock must be held before calling | |
271 | * this function. | |
272 | */ | |
273 | static | |
fb45065e MD |
274 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx, |
275 | struct ust_app *app) | |
55cc08a6 | 276 | { |
ffe60014 DG |
277 | int ret; |
278 | ||
279 | assert(ua_ctx); | |
280 | ||
55cc08a6 | 281 | if (ua_ctx->obj) { |
fb45065e | 282 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 283 | ret = ustctl_release_object(sock, ua_ctx->obj); |
fb45065e | 284 | pthread_mutex_unlock(&app->sock_lock); |
d0b96690 DG |
285 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
286 | ERR("UST app sock %d release ctx obj handle %d failed with ret %d", | |
287 | sock, ua_ctx->obj->handle, ret); | |
ffe60014 | 288 | } |
55cc08a6 DG |
289 | free(ua_ctx->obj); |
290 | } | |
291 | free(ua_ctx); | |
292 | } | |
293 | ||
d80a6244 DG |
294 | /* |
295 | * Delete ust app event safely. RCU read lock must be held before calling | |
296 | * this function. | |
297 | */ | |
8b366481 | 298 | static |
fb45065e MD |
299 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event, |
300 | struct ust_app *app) | |
d80a6244 | 301 | { |
ffe60014 DG |
302 | int ret; |
303 | ||
304 | assert(ua_event); | |
305 | ||
53a80697 | 306 | free(ua_event->filter); |
951f0b71 JI |
307 | if (ua_event->exclusion != NULL) |
308 | free(ua_event->exclusion); | |
edb67388 | 309 | if (ua_event->obj != NULL) { |
fb45065e | 310 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 311 | ret = ustctl_release_object(sock, ua_event->obj); |
fb45065e | 312 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
313 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
314 | ERR("UST app sock %d release event obj failed with ret %d", | |
315 | sock, ret); | |
316 | } | |
edb67388 DG |
317 | free(ua_event->obj); |
318 | } | |
d80a6244 DG |
319 | free(ua_event); |
320 | } | |
321 | ||
322 | /* | |
7972aab2 DG |
323 | * Release ust data object of the given stream. |
324 | * | |
325 | * Return 0 on success or else a negative value. | |
d80a6244 | 326 | */ |
fb45065e MD |
327 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream, |
328 | struct ust_app *app) | |
d80a6244 | 329 | { |
7972aab2 | 330 | int ret = 0; |
ffe60014 DG |
331 | |
332 | assert(stream); | |
333 | ||
8b366481 | 334 | if (stream->obj) { |
fb45065e | 335 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 336 | ret = ustctl_release_object(sock, stream->obj); |
fb45065e | 337 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
338 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
339 | ERR("UST app sock %d release stream obj failed with ret %d", | |
340 | sock, ret); | |
341 | } | |
4063050c | 342 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
343 | free(stream->obj); |
344 | } | |
7972aab2 DG |
345 | |
346 | return ret; | |
347 | } | |
348 | ||
349 | /* | |
350 | * Delete ust app stream safely. RCU read lock must be held before calling | |
351 | * this function. | |
352 | */ | |
353 | static | |
fb45065e MD |
354 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream, |
355 | struct ust_app *app) | |
7972aab2 DG |
356 | { |
357 | assert(stream); | |
358 | ||
fb45065e | 359 | (void) release_ust_app_stream(sock, stream, app); |
84cd17c6 | 360 | free(stream); |
d80a6244 DG |
361 | } |
362 | ||
36b588ed MD |
363 | /* |
364 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
365 | * section and outside of call_rcu thread, so we postpone its execution |
366 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
367 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
368 | */ |
369 | static | |
370 | void delete_ust_app_channel_rcu(struct rcu_head *head) | |
371 | { | |
372 | struct ust_app_channel *ua_chan = | |
373 | caa_container_of(head, struct ust_app_channel, rcu_head); | |
374 | ||
0b2dc8df MD |
375 | ht_cleanup_push(ua_chan->ctx); |
376 | ht_cleanup_push(ua_chan->events); | |
36b588ed MD |
377 | free(ua_chan); |
378 | } | |
379 | ||
fb83fe64 JD |
380 | /* |
381 | * Extract the lost packet or discarded events counter when the channel is | |
382 | * being deleted and store the value in the parent channel so we can | |
383 | * access it from lttng list and at stop/destroy. | |
82cac6d2 JG |
384 | * |
385 | * The session list lock must be held by the caller. | |
fb83fe64 JD |
386 | */ |
387 | static | |
388 | void save_per_pid_lost_discarded_counters(struct ust_app_channel *ua_chan) | |
389 | { | |
390 | uint64_t discarded = 0, lost = 0; | |
391 | struct ltt_session *session; | |
392 | struct ltt_ust_channel *uchan; | |
393 | ||
394 | if (ua_chan->attr.type != LTTNG_UST_CHAN_PER_CPU) { | |
395 | return; | |
396 | } | |
397 | ||
398 | rcu_read_lock(); | |
399 | session = session_find_by_id(ua_chan->session->tracing_id); | |
d68ec974 JG |
400 | if (!session || !session->ust_session) { |
401 | /* | |
402 | * Not finding the session is not an error because there are | |
403 | * multiple ways the channels can be torn down. | |
404 | * | |
405 | * 1) The session daemon can initiate the destruction of the | |
406 | * ust app session after receiving a destroy command or | |
407 | * during its shutdown/teardown. | |
408 | * 2) The application, since we are in per-pid tracing, is | |
409 | * unregistering and tearing down its ust app session. | |
410 | * | |
411 | * Both paths are protected by the session list lock which | |
412 | * ensures that the accounting of lost packets and discarded | |
413 | * events is done exactly once. The session is then unpublished | |
414 | * from the session list, resulting in this condition. | |
415 | */ | |
fb83fe64 JD |
416 | goto end; |
417 | } | |
418 | ||
419 | if (ua_chan->attr.overwrite) { | |
420 | consumer_get_lost_packets(ua_chan->session->tracing_id, | |
421 | ua_chan->key, session->ust_session->consumer, | |
422 | &lost); | |
423 | } else { | |
424 | consumer_get_discarded_events(ua_chan->session->tracing_id, | |
425 | ua_chan->key, session->ust_session->consumer, | |
426 | &discarded); | |
427 | } | |
428 | uchan = trace_ust_find_channel_by_name( | |
429 | session->ust_session->domain_global.channels, | |
430 | ua_chan->name); | |
431 | if (!uchan) { | |
432 | ERR("Missing UST channel to store discarded counters"); | |
433 | goto end; | |
434 | } | |
435 | ||
436 | uchan->per_pid_closed_app_discarded += discarded; | |
437 | uchan->per_pid_closed_app_lost += lost; | |
438 | ||
439 | end: | |
440 | rcu_read_unlock(); | |
e32d7f27 JG |
441 | if (session) { |
442 | session_put(session); | |
443 | } | |
fb83fe64 JD |
444 | } |
445 | ||
d80a6244 DG |
446 | /* |
447 | * Delete ust app channel safely. RCU read lock must be held before calling | |
448 | * this function. | |
82cac6d2 JG |
449 | * |
450 | * The session list lock must be held by the caller. | |
d80a6244 | 451 | */ |
8b366481 | 452 | static |
d0b96690 DG |
453 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
454 | struct ust_app *app) | |
d80a6244 DG |
455 | { |
456 | int ret; | |
bec39940 | 457 | struct lttng_ht_iter iter; |
d80a6244 | 458 | struct ust_app_event *ua_event; |
55cc08a6 | 459 | struct ust_app_ctx *ua_ctx; |
030a66fa | 460 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 461 | struct ust_registry_session *registry; |
d80a6244 | 462 | |
ffe60014 DG |
463 | assert(ua_chan); |
464 | ||
465 | DBG3("UST app deleting channel %s", ua_chan->name); | |
466 | ||
55cc08a6 | 467 | /* Wipe stream */ |
d80a6244 | 468 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 469 | cds_list_del(&stream->list); |
fb45065e | 470 | delete_ust_app_stream(sock, stream, app); |
d80a6244 DG |
471 | } |
472 | ||
55cc08a6 | 473 | /* Wipe context */ |
bec39940 | 474 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
31746f93 | 475 | cds_list_del(&ua_ctx->list); |
bec39940 | 476 | ret = lttng_ht_del(ua_chan->ctx, &iter); |
55cc08a6 | 477 | assert(!ret); |
fb45065e | 478 | delete_ust_app_ctx(sock, ua_ctx, app); |
55cc08a6 | 479 | } |
d80a6244 | 480 | |
55cc08a6 | 481 | /* Wipe events */ |
bec39940 DG |
482 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
483 | node.node) { | |
484 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 485 | assert(!ret); |
fb45065e | 486 | delete_ust_app_event(sock, ua_event, app); |
d80a6244 | 487 | } |
edb67388 | 488 | |
c8335706 MD |
489 | if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) { |
490 | /* Wipe and free registry from session registry. */ | |
491 | registry = get_session_registry(ua_chan->session); | |
492 | if (registry) { | |
e9404c27 | 493 | ust_registry_channel_del_free(registry, ua_chan->key, |
e38d96f9 MD |
494 | sock >= 0); |
495 | } | |
45798a31 JG |
496 | /* |
497 | * A negative socket can be used by the caller when | |
498 | * cleaning-up a ua_chan in an error path. Skip the | |
499 | * accounting in this case. | |
500 | */ | |
e38d96f9 MD |
501 | if (sock >= 0) { |
502 | save_per_pid_lost_discarded_counters(ua_chan); | |
c8335706 | 503 | } |
7972aab2 | 504 | } |
d0b96690 | 505 | |
edb67388 | 506 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
507 | /* Remove channel from application UST object descriptor. */ |
508 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
c6e62271 DG |
509 | ret = lttng_ht_del(app->ust_objd, &iter); |
510 | assert(!ret); | |
fb45065e | 511 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 512 | ret = ustctl_release_object(sock, ua_chan->obj); |
fb45065e | 513 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
514 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
515 | ERR("UST app sock %d release channel obj failed with ret %d", | |
516 | sock, ret); | |
517 | } | |
7972aab2 | 518 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
519 | free(ua_chan->obj); |
520 | } | |
36b588ed | 521 | call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); |
d80a6244 DG |
522 | } |
523 | ||
fb45065e MD |
524 | int ust_app_register_done(struct ust_app *app) |
525 | { | |
526 | int ret; | |
527 | ||
528 | pthread_mutex_lock(&app->sock_lock); | |
529 | ret = ustctl_register_done(app->sock); | |
530 | pthread_mutex_unlock(&app->sock_lock); | |
531 | return ret; | |
532 | } | |
533 | ||
534 | int ust_app_release_object(struct ust_app *app, struct lttng_ust_object_data *data) | |
535 | { | |
536 | int ret, sock; | |
537 | ||
538 | if (app) { | |
539 | pthread_mutex_lock(&app->sock_lock); | |
540 | sock = app->sock; | |
541 | } else { | |
542 | sock = -1; | |
543 | } | |
544 | ret = ustctl_release_object(sock, data); | |
545 | if (app) { | |
546 | pthread_mutex_unlock(&app->sock_lock); | |
547 | } | |
548 | return ret; | |
549 | } | |
550 | ||
331744e3 | 551 | /* |
1b532a60 DG |
552 | * Push metadata to consumer socket. |
553 | * | |
dc2bbdae MD |
554 | * RCU read-side lock must be held to guarantee existance of socket. |
555 | * Must be called with the ust app session lock held. | |
556 | * Must be called with the registry lock held. | |
331744e3 JD |
557 | * |
558 | * On success, return the len of metadata pushed or else a negative value. | |
2c57e06d MD |
559 | * Returning a -EPIPE return value means we could not send the metadata, |
560 | * but it can be caused by recoverable errors (e.g. the application has | |
561 | * terminated concurrently). | |
331744e3 JD |
562 | */ |
563 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
564 | struct consumer_socket *socket, int send_zero_data) | |
565 | { | |
566 | int ret; | |
567 | char *metadata_str = NULL; | |
c585821b | 568 | size_t len, offset, new_metadata_len_sent; |
331744e3 | 569 | ssize_t ret_val; |
93ec662e | 570 | uint64_t metadata_key, metadata_version; |
331744e3 JD |
571 | |
572 | assert(registry); | |
573 | assert(socket); | |
1b532a60 | 574 | |
c585821b MD |
575 | metadata_key = registry->metadata_key; |
576 | ||
ce34fcd0 | 577 | /* |
dc2bbdae MD |
578 | * Means that no metadata was assigned to the session. This can |
579 | * happens if no start has been done previously. | |
ce34fcd0 | 580 | */ |
c585821b | 581 | if (!metadata_key) { |
ce34fcd0 MD |
582 | return 0; |
583 | } | |
584 | ||
331744e3 JD |
585 | offset = registry->metadata_len_sent; |
586 | len = registry->metadata_len - registry->metadata_len_sent; | |
c585821b | 587 | new_metadata_len_sent = registry->metadata_len; |
93ec662e | 588 | metadata_version = registry->metadata_version; |
331744e3 JD |
589 | if (len == 0) { |
590 | DBG3("No metadata to push for metadata key %" PRIu64, | |
591 | registry->metadata_key); | |
592 | ret_val = len; | |
593 | if (send_zero_data) { | |
594 | DBG("No metadata to push"); | |
595 | goto push_data; | |
596 | } | |
597 | goto end; | |
598 | } | |
599 | ||
600 | /* Allocate only what we have to send. */ | |
601 | metadata_str = zmalloc(len); | |
602 | if (!metadata_str) { | |
603 | PERROR("zmalloc ust app metadata string"); | |
604 | ret_val = -ENOMEM; | |
605 | goto error; | |
606 | } | |
c585821b | 607 | /* Copy what we haven't sent out. */ |
331744e3 | 608 | memcpy(metadata_str, registry->metadata + offset, len); |
331744e3 JD |
609 | |
610 | push_data: | |
c585821b MD |
611 | pthread_mutex_unlock(®istry->lock); |
612 | /* | |
613 | * We need to unlock the registry while we push metadata to | |
614 | * break a circular dependency between the consumerd metadata | |
615 | * lock and the sessiond registry lock. Indeed, pushing metadata | |
616 | * to the consumerd awaits that it gets pushed all the way to | |
617 | * relayd, but doing so requires grabbing the metadata lock. If | |
618 | * a concurrent metadata request is being performed by | |
619 | * consumerd, this can try to grab the registry lock on the | |
620 | * sessiond while holding the metadata lock on the consumer | |
621 | * daemon. Those push and pull schemes are performed on two | |
622 | * different bidirectionnal communication sockets. | |
623 | */ | |
624 | ret = consumer_push_metadata(socket, metadata_key, | |
93ec662e | 625 | metadata_str, len, offset, metadata_version); |
c585821b | 626 | pthread_mutex_lock(®istry->lock); |
331744e3 | 627 | if (ret < 0) { |
000baf6a | 628 | /* |
dc2bbdae MD |
629 | * There is an acceptable race here between the registry |
630 | * metadata key assignment and the creation on the | |
631 | * consumer. The session daemon can concurrently push | |
632 | * metadata for this registry while being created on the | |
633 | * consumer since the metadata key of the registry is | |
634 | * assigned *before* it is setup to avoid the consumer | |
635 | * to ask for metadata that could possibly be not found | |
636 | * in the session daemon. | |
000baf6a | 637 | * |
dc2bbdae MD |
638 | * The metadata will get pushed either by the session |
639 | * being stopped or the consumer requesting metadata if | |
640 | * that race is triggered. | |
000baf6a DG |
641 | */ |
642 | if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) { | |
643 | ret = 0; | |
c585821b MD |
644 | } else { |
645 | ERR("Error pushing metadata to consumer"); | |
000baf6a | 646 | } |
331744e3 JD |
647 | ret_val = ret; |
648 | goto error_push; | |
c585821b MD |
649 | } else { |
650 | /* | |
651 | * Metadata may have been concurrently pushed, since | |
652 | * we're not holding the registry lock while pushing to | |
653 | * consumer. This is handled by the fact that we send | |
654 | * the metadata content, size, and the offset at which | |
655 | * that metadata belongs. This may arrive out of order | |
656 | * on the consumer side, and the consumer is able to | |
657 | * deal with overlapping fragments. The consumer | |
658 | * supports overlapping fragments, which must be | |
659 | * contiguous starting from offset 0. We keep the | |
660 | * largest metadata_len_sent value of the concurrent | |
661 | * send. | |
662 | */ | |
663 | registry->metadata_len_sent = | |
664 | max_t(size_t, registry->metadata_len_sent, | |
665 | new_metadata_len_sent); | |
331744e3 | 666 | } |
331744e3 JD |
667 | free(metadata_str); |
668 | return len; | |
669 | ||
670 | end: | |
671 | error: | |
ce34fcd0 MD |
672 | if (ret_val) { |
673 | /* | |
dc2bbdae MD |
674 | * On error, flag the registry that the metadata is |
675 | * closed. We were unable to push anything and this | |
676 | * means that either the consumer is not responding or | |
677 | * the metadata cache has been destroyed on the | |
678 | * consumer. | |
ce34fcd0 MD |
679 | */ |
680 | registry->metadata_closed = 1; | |
681 | } | |
331744e3 JD |
682 | error_push: |
683 | free(metadata_str); | |
684 | return ret_val; | |
685 | } | |
686 | ||
d88aee68 | 687 | /* |
ce34fcd0 | 688 | * For a given application and session, push metadata to consumer. |
331744e3 JD |
689 | * Either sock or consumer is required : if sock is NULL, the default |
690 | * socket to send the metadata is retrieved from consumer, if sock | |
691 | * is not NULL we use it to send the metadata. | |
ce34fcd0 | 692 | * RCU read-side lock must be held while calling this function, |
dc2bbdae MD |
693 | * therefore ensuring existance of registry. It also ensures existance |
694 | * of socket throughout this function. | |
d88aee68 DG |
695 | * |
696 | * Return 0 on success else a negative error. | |
2c57e06d MD |
697 | * Returning a -EPIPE return value means we could not send the metadata, |
698 | * but it can be caused by recoverable errors (e.g. the application has | |
699 | * terminated concurrently). | |
d88aee68 | 700 | */ |
7972aab2 DG |
701 | static int push_metadata(struct ust_registry_session *registry, |
702 | struct consumer_output *consumer) | |
d88aee68 | 703 | { |
331744e3 JD |
704 | int ret_val; |
705 | ssize_t ret; | |
d88aee68 DG |
706 | struct consumer_socket *socket; |
707 | ||
7972aab2 DG |
708 | assert(registry); |
709 | assert(consumer); | |
710 | ||
ce34fcd0 | 711 | pthread_mutex_lock(®istry->lock); |
ce34fcd0 | 712 | if (registry->metadata_closed) { |
dc2bbdae MD |
713 | ret_val = -EPIPE; |
714 | goto error; | |
d88aee68 DG |
715 | } |
716 | ||
d88aee68 | 717 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
718 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
719 | consumer); | |
d88aee68 | 720 | if (!socket) { |
331744e3 | 721 | ret_val = -1; |
ce34fcd0 | 722 | goto error; |
d88aee68 DG |
723 | } |
724 | ||
331744e3 | 725 | ret = ust_app_push_metadata(registry, socket, 0); |
d88aee68 | 726 | if (ret < 0) { |
331744e3 | 727 | ret_val = ret; |
ce34fcd0 | 728 | goto error; |
d88aee68 | 729 | } |
dc2bbdae | 730 | pthread_mutex_unlock(®istry->lock); |
d88aee68 DG |
731 | return 0; |
732 | ||
ce34fcd0 | 733 | error: |
dc2bbdae | 734 | pthread_mutex_unlock(®istry->lock); |
331744e3 | 735 | return ret_val; |
d88aee68 DG |
736 | } |
737 | ||
738 | /* | |
739 | * Send to the consumer a close metadata command for the given session. Once | |
740 | * done, the metadata channel is deleted and the session metadata pointer is | |
dc2bbdae | 741 | * nullified. The session lock MUST be held unless the application is |
d88aee68 DG |
742 | * in the destroy path. |
743 | * | |
744 | * Return 0 on success else a negative value. | |
745 | */ | |
7972aab2 DG |
746 | static int close_metadata(struct ust_registry_session *registry, |
747 | struct consumer_output *consumer) | |
d88aee68 DG |
748 | { |
749 | int ret; | |
750 | struct consumer_socket *socket; | |
751 | ||
7972aab2 DG |
752 | assert(registry); |
753 | assert(consumer); | |
d88aee68 | 754 | |
7972aab2 DG |
755 | rcu_read_lock(); |
756 | ||
ce34fcd0 MD |
757 | pthread_mutex_lock(®istry->lock); |
758 | ||
7972aab2 | 759 | if (!registry->metadata_key || registry->metadata_closed) { |
d88aee68 | 760 | ret = 0; |
1b532a60 | 761 | goto end; |
d88aee68 DG |
762 | } |
763 | ||
d88aee68 | 764 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
765 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
766 | consumer); | |
d88aee68 DG |
767 | if (!socket) { |
768 | ret = -1; | |
7972aab2 | 769 | goto error; |
d88aee68 DG |
770 | } |
771 | ||
7972aab2 | 772 | ret = consumer_close_metadata(socket, registry->metadata_key); |
d88aee68 | 773 | if (ret < 0) { |
7972aab2 | 774 | goto error; |
d88aee68 DG |
775 | } |
776 | ||
d88aee68 | 777 | error: |
1b532a60 DG |
778 | /* |
779 | * Metadata closed. Even on error this means that the consumer is not | |
780 | * responding or not found so either way a second close should NOT be emit | |
781 | * for this registry. | |
782 | */ | |
783 | registry->metadata_closed = 1; | |
784 | end: | |
ce34fcd0 | 785 | pthread_mutex_unlock(®istry->lock); |
7972aab2 | 786 | rcu_read_unlock(); |
d88aee68 DG |
787 | return ret; |
788 | } | |
789 | ||
36b588ed MD |
790 | /* |
791 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
792 | * section and outside of call_rcu thread, so we postpone its execution |
793 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
794 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
795 | */ |
796 | static | |
797 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
798 | { | |
799 | struct ust_app_session *ua_sess = | |
800 | caa_container_of(head, struct ust_app_session, rcu_head); | |
801 | ||
0b2dc8df | 802 | ht_cleanup_push(ua_sess->channels); |
36b588ed MD |
803 | free(ua_sess); |
804 | } | |
805 | ||
d80a6244 DG |
806 | /* |
807 | * Delete ust app session safely. RCU read lock must be held before calling | |
808 | * this function. | |
82cac6d2 JG |
809 | * |
810 | * The session list lock must be held by the caller. | |
d80a6244 | 811 | */ |
8b366481 | 812 | static |
d0b96690 DG |
813 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
814 | struct ust_app *app) | |
d80a6244 DG |
815 | { |
816 | int ret; | |
bec39940 | 817 | struct lttng_ht_iter iter; |
d80a6244 | 818 | struct ust_app_channel *ua_chan; |
7972aab2 | 819 | struct ust_registry_session *registry; |
d80a6244 | 820 | |
d88aee68 DG |
821 | assert(ua_sess); |
822 | ||
1b532a60 DG |
823 | pthread_mutex_lock(&ua_sess->lock); |
824 | ||
b161602a MD |
825 | assert(!ua_sess->deleted); |
826 | ua_sess->deleted = true; | |
827 | ||
7972aab2 | 828 | registry = get_session_registry(ua_sess); |
fad1ed2f | 829 | /* Registry can be null on error path during initialization. */ |
ce34fcd0 | 830 | if (registry) { |
d88aee68 | 831 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 832 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 833 | |
7972aab2 DG |
834 | /* |
835 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
836 | * metadata only on destroy trace session in this case. Also, the |
837 | * previous push metadata could have flag the metadata registry to | |
838 | * close so don't send a close command if closed. | |
7972aab2 | 839 | */ |
ce34fcd0 | 840 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
841 | /* And ask to close it for this session registry. */ |
842 | (void) close_metadata(registry, ua_sess->consumer); | |
843 | } | |
d80a6244 DG |
844 | } |
845 | ||
bec39940 DG |
846 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
847 | node.node) { | |
848 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 849 | assert(!ret); |
d0b96690 | 850 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 851 | } |
d80a6244 | 852 | |
7972aab2 DG |
853 | /* In case of per PID, the registry is kept in the session. */ |
854 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
855 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
856 | if (reg_pid) { | |
fad1ed2f JR |
857 | /* |
858 | * Registry can be null on error path during | |
859 | * initialization. | |
860 | */ | |
7972aab2 DG |
861 | buffer_reg_pid_remove(reg_pid); |
862 | buffer_reg_pid_destroy(reg_pid); | |
863 | } | |
864 | } | |
d0b96690 | 865 | |
aee6bafd | 866 | if (ua_sess->handle != -1) { |
fb45065e | 867 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 868 | ret = ustctl_release_handle(sock, ua_sess->handle); |
fb45065e | 869 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
870 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
871 | ERR("UST app sock %d release session handle failed with ret %d", | |
872 | sock, ret); | |
873 | } | |
10b56aef MD |
874 | /* Remove session from application UST object descriptor. */ |
875 | iter.iter.node = &ua_sess->ust_objd_node.node; | |
876 | ret = lttng_ht_del(app->ust_sessions_objd, &iter); | |
877 | assert(!ret); | |
aee6bafd | 878 | } |
10b56aef | 879 | |
1b532a60 DG |
880 | pthread_mutex_unlock(&ua_sess->lock); |
881 | ||
6addfa37 MD |
882 | consumer_output_put(ua_sess->consumer); |
883 | ||
36b588ed | 884 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 885 | } |
91d76f53 DG |
886 | |
887 | /* | |
284d8f55 DG |
888 | * Delete a traceable application structure from the global list. Never call |
889 | * this function outside of a call_rcu call. | |
36b588ed MD |
890 | * |
891 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 892 | */ |
8b366481 DG |
893 | static |
894 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 895 | { |
8b366481 | 896 | int ret, sock; |
d42f20df | 897 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 898 | |
82cac6d2 JG |
899 | /* |
900 | * The session list lock must be held during this function to guarantee | |
901 | * the existence of ua_sess. | |
902 | */ | |
903 | session_lock_list(); | |
d80a6244 | 904 | /* Delete ust app sessions info */ |
852d0037 DG |
905 | sock = app->sock; |
906 | app->sock = -1; | |
d80a6244 | 907 | |
8b366481 | 908 | /* Wipe sessions */ |
d42f20df DG |
909 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
910 | teardown_node) { | |
911 | /* Free every object in the session and the session. */ | |
36b588ed | 912 | rcu_read_lock(); |
d0b96690 | 913 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 914 | rcu_read_unlock(); |
d80a6244 | 915 | } |
36b588ed | 916 | |
0b2dc8df | 917 | ht_cleanup_push(app->sessions); |
10b56aef | 918 | ht_cleanup_push(app->ust_sessions_objd); |
0b2dc8df | 919 | ht_cleanup_push(app->ust_objd); |
d80a6244 | 920 | |
6414a713 | 921 | /* |
852d0037 DG |
922 | * Wait until we have deleted the application from the sock hash table |
923 | * before closing this socket, otherwise an application could re-use the | |
924 | * socket ID and race with the teardown, using the same hash table entry. | |
925 | * | |
926 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
927 | * all RCU readers that could run concurrently with unregister app, | |
928 | * therefore we _need_ to only close that socket after a grace period. So | |
929 | * it should stay in this RCU callback. | |
930 | * | |
931 | * This close() is a very important step of the synchronization model so | |
932 | * every modification to this function must be carefully reviewed. | |
6414a713 | 933 | */ |
799e2c4f MD |
934 | ret = close(sock); |
935 | if (ret) { | |
936 | PERROR("close"); | |
937 | } | |
4063050c | 938 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 939 | |
852d0037 | 940 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 941 | free(app); |
82cac6d2 | 942 | session_unlock_list(); |
099e26bd DG |
943 | } |
944 | ||
945 | /* | |
f6a9efaa | 946 | * URCU intermediate call to delete an UST app. |
099e26bd | 947 | */ |
8b366481 DG |
948 | static |
949 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 950 | { |
bec39940 DG |
951 | struct lttng_ht_node_ulong *node = |
952 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 953 | struct ust_app *app = |
852d0037 | 954 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 955 | |
852d0037 | 956 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 957 | delete_ust_app(app); |
099e26bd DG |
958 | } |
959 | ||
ffe60014 DG |
960 | /* |
961 | * Delete the session from the application ht and delete the data structure by | |
962 | * freeing every object inside and releasing them. | |
82cac6d2 JG |
963 | * |
964 | * The session list lock must be held by the caller. | |
ffe60014 | 965 | */ |
d0b96690 | 966 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
967 | struct ust_app_session *ua_sess) |
968 | { | |
969 | int ret; | |
970 | struct lttng_ht_iter iter; | |
971 | ||
972 | assert(app); | |
973 | assert(ua_sess); | |
974 | ||
975 | iter.iter.node = &ua_sess->node.node; | |
976 | ret = lttng_ht_del(app->sessions, &iter); | |
977 | if (ret) { | |
978 | /* Already scheduled for teardown. */ | |
979 | goto end; | |
980 | } | |
981 | ||
982 | /* Once deleted, free the data structure. */ | |
d0b96690 | 983 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
984 | |
985 | end: | |
986 | return; | |
987 | } | |
988 | ||
8b366481 DG |
989 | /* |
990 | * Alloc new UST app session. | |
991 | */ | |
992 | static | |
40bbd087 | 993 | struct ust_app_session *alloc_ust_app_session(void) |
8b366481 DG |
994 | { |
995 | struct ust_app_session *ua_sess; | |
996 | ||
997 | /* Init most of the default value by allocating and zeroing */ | |
998 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
999 | if (ua_sess == NULL) { | |
1000 | PERROR("malloc"); | |
ffe60014 | 1001 | goto error_free; |
8b366481 DG |
1002 | } |
1003 | ||
1004 | ua_sess->handle = -1; | |
bec39940 | 1005 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
ad7a9107 | 1006 | ua_sess->metadata_attr.type = LTTNG_UST_CHAN_METADATA; |
84ad93e8 | 1007 | pthread_mutex_init(&ua_sess->lock, NULL); |
ad7a9107 | 1008 | |
8b366481 DG |
1009 | return ua_sess; |
1010 | ||
ffe60014 | 1011 | error_free: |
8b366481 DG |
1012 | return NULL; |
1013 | } | |
1014 | ||
1015 | /* | |
1016 | * Alloc new UST app channel. | |
1017 | */ | |
1018 | static | |
1019 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 1020 | struct ust_app_session *ua_sess, |
ffe60014 | 1021 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
1022 | { |
1023 | struct ust_app_channel *ua_chan; | |
1024 | ||
1025 | /* Init most of the default value by allocating and zeroing */ | |
1026 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
1027 | if (ua_chan == NULL) { | |
1028 | PERROR("malloc"); | |
1029 | goto error; | |
1030 | } | |
1031 | ||
1032 | /* Setup channel name */ | |
1033 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
1034 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
1035 | ||
1036 | ua_chan->enabled = 1; | |
1037 | ua_chan->handle = -1; | |
45893984 | 1038 | ua_chan->session = ua_sess; |
ffe60014 | 1039 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
1040 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
1041 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
1042 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
1043 | |
1044 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
31746f93 | 1045 | CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); |
8b366481 DG |
1046 | |
1047 | /* Copy attributes */ | |
1048 | if (attr) { | |
ffe60014 | 1049 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
1050 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
1051 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
1052 | ua_chan->attr.overwrite = attr->overwrite; | |
1053 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
1054 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
1055 | ua_chan->attr.output = attr->output; | |
491d1539 | 1056 | ua_chan->attr.blocking_timeout = attr->u.s.blocking_timeout; |
8b366481 | 1057 | } |
ffe60014 DG |
1058 | /* By default, the channel is a per cpu channel. */ |
1059 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
1060 | |
1061 | DBG3("UST app channel %s allocated", ua_chan->name); | |
1062 | ||
1063 | return ua_chan; | |
1064 | ||
1065 | error: | |
1066 | return NULL; | |
1067 | } | |
1068 | ||
37f1c236 DG |
1069 | /* |
1070 | * Allocate and initialize a UST app stream. | |
1071 | * | |
1072 | * Return newly allocated stream pointer or NULL on error. | |
1073 | */ | |
ffe60014 | 1074 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
1075 | { |
1076 | struct ust_app_stream *stream = NULL; | |
1077 | ||
1078 | stream = zmalloc(sizeof(*stream)); | |
1079 | if (stream == NULL) { | |
1080 | PERROR("zmalloc ust app stream"); | |
1081 | goto error; | |
1082 | } | |
1083 | ||
1084 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
1085 | stream->handle = -1; | |
1086 | ||
1087 | error: | |
1088 | return stream; | |
1089 | } | |
1090 | ||
8b366481 DG |
1091 | /* |
1092 | * Alloc new UST app event. | |
1093 | */ | |
1094 | static | |
1095 | struct ust_app_event *alloc_ust_app_event(char *name, | |
1096 | struct lttng_ust_event *attr) | |
1097 | { | |
1098 | struct ust_app_event *ua_event; | |
1099 | ||
1100 | /* Init most of the default value by allocating and zeroing */ | |
1101 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
1102 | if (ua_event == NULL) { | |
1103 | PERROR("malloc"); | |
1104 | goto error; | |
1105 | } | |
1106 | ||
1107 | ua_event->enabled = 1; | |
1108 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
1109 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 1110 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
1111 | |
1112 | /* Copy attributes */ | |
1113 | if (attr) { | |
1114 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
1115 | } | |
1116 | ||
1117 | DBG3("UST app event %s allocated", ua_event->name); | |
1118 | ||
1119 | return ua_event; | |
1120 | ||
1121 | error: | |
1122 | return NULL; | |
1123 | } | |
1124 | ||
1125 | /* | |
1126 | * Alloc new UST app context. | |
1127 | */ | |
1128 | static | |
bdf64013 | 1129 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context_attr *uctx) |
8b366481 DG |
1130 | { |
1131 | struct ust_app_ctx *ua_ctx; | |
1132 | ||
1133 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
1134 | if (ua_ctx == NULL) { | |
1135 | goto error; | |
1136 | } | |
1137 | ||
31746f93 DG |
1138 | CDS_INIT_LIST_HEAD(&ua_ctx->list); |
1139 | ||
8b366481 DG |
1140 | if (uctx) { |
1141 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
bdf64013 JG |
1142 | if (uctx->ctx == LTTNG_UST_CONTEXT_APP_CONTEXT) { |
1143 | char *provider_name = NULL, *ctx_name = NULL; | |
1144 | ||
1145 | provider_name = strdup(uctx->u.app_ctx.provider_name); | |
1146 | ctx_name = strdup(uctx->u.app_ctx.ctx_name); | |
1147 | if (!provider_name || !ctx_name) { | |
1148 | free(provider_name); | |
1149 | free(ctx_name); | |
1150 | goto error; | |
1151 | } | |
1152 | ||
1153 | ua_ctx->ctx.u.app_ctx.provider_name = provider_name; | |
1154 | ua_ctx->ctx.u.app_ctx.ctx_name = ctx_name; | |
1155 | } | |
8b366481 DG |
1156 | } |
1157 | ||
1158 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
8b366481 | 1159 | return ua_ctx; |
bdf64013 JG |
1160 | error: |
1161 | free(ua_ctx); | |
1162 | return NULL; | |
8b366481 DG |
1163 | } |
1164 | ||
025faf73 DG |
1165 | /* |
1166 | * Allocate a filter and copy the given original filter. | |
1167 | * | |
1168 | * Return allocated filter or NULL on error. | |
1169 | */ | |
51755dc8 JG |
1170 | static struct lttng_filter_bytecode *copy_filter_bytecode( |
1171 | struct lttng_filter_bytecode *orig_f) | |
025faf73 | 1172 | { |
51755dc8 | 1173 | struct lttng_filter_bytecode *filter = NULL; |
025faf73 DG |
1174 | |
1175 | /* Copy filter bytecode */ | |
1176 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
1177 | if (!filter) { | |
51755dc8 | 1178 | PERROR("zmalloc alloc filter bytecode"); |
025faf73 DG |
1179 | goto error; |
1180 | } | |
1181 | ||
1182 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
1183 | ||
1184 | error: | |
1185 | return filter; | |
1186 | } | |
1187 | ||
51755dc8 JG |
1188 | /* |
1189 | * Create a liblttng-ust filter bytecode from given bytecode. | |
1190 | * | |
1191 | * Return allocated filter or NULL on error. | |
1192 | */ | |
1193 | static struct lttng_ust_filter_bytecode *create_ust_bytecode_from_bytecode( | |
1194 | struct lttng_filter_bytecode *orig_f) | |
1195 | { | |
1196 | struct lttng_ust_filter_bytecode *filter = NULL; | |
1197 | ||
1198 | /* Copy filter bytecode */ | |
1199 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
1200 | if (!filter) { | |
1201 | PERROR("zmalloc alloc ust filter bytecode"); | |
1202 | goto error; | |
1203 | } | |
1204 | ||
1205 | assert(sizeof(struct lttng_filter_bytecode) == | |
1206 | sizeof(struct lttng_ust_filter_bytecode)); | |
1207 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
1208 | error: | |
1209 | return filter; | |
1210 | } | |
1211 | ||
099e26bd | 1212 | /* |
421cb601 DG |
1213 | * Find an ust_app using the sock and return it. RCU read side lock must be |
1214 | * held before calling this helper function. | |
099e26bd | 1215 | */ |
f20baf8e | 1216 | struct ust_app *ust_app_find_by_sock(int sock) |
099e26bd | 1217 | { |
bec39940 | 1218 | struct lttng_ht_node_ulong *node; |
bec39940 | 1219 | struct lttng_ht_iter iter; |
f6a9efaa | 1220 | |
852d0037 | 1221 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 1222 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
1223 | if (node == NULL) { |
1224 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
1225 | goto error; |
1226 | } | |
852d0037 DG |
1227 | |
1228 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
1229 | |
1230 | error: | |
1231 | return NULL; | |
099e26bd DG |
1232 | } |
1233 | ||
d0b96690 DG |
1234 | /* |
1235 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
1236 | * be held before calling this helper function. | |
1237 | */ | |
1238 | static struct ust_app *find_app_by_notify_sock(int sock) | |
1239 | { | |
1240 | struct lttng_ht_node_ulong *node; | |
1241 | struct lttng_ht_iter iter; | |
1242 | ||
1243 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
1244 | &iter); | |
1245 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1246 | if (node == NULL) { | |
1247 | DBG2("UST app find by notify sock %d not found", sock); | |
1248 | goto error; | |
1249 | } | |
1250 | ||
1251 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
1252 | ||
1253 | error: | |
1254 | return NULL; | |
1255 | } | |
1256 | ||
025faf73 DG |
1257 | /* |
1258 | * Lookup for an ust app event based on event name, filter bytecode and the | |
1259 | * event loglevel. | |
1260 | * | |
1261 | * Return an ust_app_event object or NULL on error. | |
1262 | */ | |
18eace3b | 1263 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
88e3c2f5 | 1264 | const char *name, const struct lttng_filter_bytecode *filter, |
2106efa0 | 1265 | int loglevel_value, |
39c5a3a7 | 1266 | const struct lttng_event_exclusion *exclusion) |
18eace3b DG |
1267 | { |
1268 | struct lttng_ht_iter iter; | |
1269 | struct lttng_ht_node_str *node; | |
1270 | struct ust_app_event *event = NULL; | |
1271 | struct ust_app_ht_key key; | |
18eace3b DG |
1272 | |
1273 | assert(name); | |
1274 | assert(ht); | |
1275 | ||
1276 | /* Setup key for event lookup. */ | |
1277 | key.name = name; | |
1278 | key.filter = filter; | |
2106efa0 | 1279 | key.loglevel_type = loglevel_value; |
39c5a3a7 | 1280 | /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */ |
51755dc8 | 1281 | key.exclusion = exclusion; |
18eace3b | 1282 | |
025faf73 DG |
1283 | /* Lookup using the event name as hash and a custom match fct. */ |
1284 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1285 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1286 | node = lttng_ht_iter_get_node_str(&iter); |
1287 | if (node == NULL) { | |
1288 | goto end; | |
1289 | } | |
1290 | ||
1291 | event = caa_container_of(node, struct ust_app_event, node); | |
1292 | ||
1293 | end: | |
18eace3b DG |
1294 | return event; |
1295 | } | |
1296 | ||
55cc08a6 DG |
1297 | /* |
1298 | * Create the channel context on the tracer. | |
d0b96690 DG |
1299 | * |
1300 | * Called with UST app session lock held. | |
55cc08a6 DG |
1301 | */ |
1302 | static | |
1303 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1304 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1305 | { | |
1306 | int ret; | |
1307 | ||
840cb59c | 1308 | health_code_update(); |
86acf0da | 1309 | |
fb45065e | 1310 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1311 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 | 1312 | ua_chan->obj, &ua_ctx->obj); |
fb45065e | 1313 | pthread_mutex_unlock(&app->sock_lock); |
55cc08a6 | 1314 | if (ret < 0) { |
ffe60014 DG |
1315 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1316 | ERR("UST app create channel context failed for app (pid: %d) " | |
1317 | "with ret %d", app->pid, ret); | |
1318 | } else { | |
3757b385 DG |
1319 | /* |
1320 | * This is normal behavior, an application can die during the | |
1321 | * creation process. Don't report an error so the execution can | |
1322 | * continue normally. | |
1323 | */ | |
1324 | ret = 0; | |
88e3c2f5 | 1325 | DBG3("UST app add context failed. Application is dead."); |
ffe60014 | 1326 | } |
55cc08a6 DG |
1327 | goto error; |
1328 | } | |
1329 | ||
1330 | ua_ctx->handle = ua_ctx->obj->handle; | |
1331 | ||
d0b96690 DG |
1332 | DBG2("UST app context handle %d created successfully for channel %s", |
1333 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1334 | |
1335 | error: | |
840cb59c | 1336 | health_code_update(); |
55cc08a6 DG |
1337 | return ret; |
1338 | } | |
1339 | ||
53a80697 MD |
1340 | /* |
1341 | * Set the filter on the tracer. | |
1342 | */ | |
1343 | static | |
1344 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
1345 | struct ust_app *app) | |
1346 | { | |
1347 | int ret; | |
51755dc8 | 1348 | struct lttng_ust_filter_bytecode *ust_bytecode = NULL; |
53a80697 | 1349 | |
840cb59c | 1350 | health_code_update(); |
86acf0da | 1351 | |
53a80697 | 1352 | if (!ua_event->filter) { |
86acf0da DG |
1353 | ret = 0; |
1354 | goto error; | |
53a80697 MD |
1355 | } |
1356 | ||
51755dc8 JG |
1357 | ust_bytecode = create_ust_bytecode_from_bytecode(ua_event->filter); |
1358 | if (!ust_bytecode) { | |
1359 | ret = -LTTNG_ERR_NOMEM; | |
1360 | goto error; | |
1361 | } | |
fb45065e | 1362 | pthread_mutex_lock(&app->sock_lock); |
51755dc8 | 1363 | ret = ustctl_set_filter(app->sock, ust_bytecode, |
53a80697 | 1364 | ua_event->obj); |
fb45065e | 1365 | pthread_mutex_unlock(&app->sock_lock); |
53a80697 | 1366 | if (ret < 0) { |
ffe60014 DG |
1367 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1368 | ERR("UST app event %s filter failed for app (pid: %d) " | |
1369 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1370 | } else { | |
3757b385 DG |
1371 | /* |
1372 | * This is normal behavior, an application can die during the | |
1373 | * creation process. Don't report an error so the execution can | |
1374 | * continue normally. | |
1375 | */ | |
1376 | ret = 0; | |
ffe60014 DG |
1377 | DBG3("UST app filter event failed. Application is dead."); |
1378 | } | |
53a80697 MD |
1379 | goto error; |
1380 | } | |
1381 | ||
1382 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
1383 | ||
1384 | error: | |
840cb59c | 1385 | health_code_update(); |
51755dc8 | 1386 | free(ust_bytecode); |
53a80697 MD |
1387 | return ret; |
1388 | } | |
1389 | ||
51755dc8 JG |
1390 | static |
1391 | struct lttng_ust_event_exclusion *create_ust_exclusion_from_exclusion( | |
1392 | struct lttng_event_exclusion *exclusion) | |
1393 | { | |
1394 | struct lttng_ust_event_exclusion *ust_exclusion = NULL; | |
1395 | size_t exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) + | |
1396 | LTTNG_UST_SYM_NAME_LEN * exclusion->count; | |
1397 | ||
1398 | ust_exclusion = zmalloc(exclusion_alloc_size); | |
1399 | if (!ust_exclusion) { | |
1400 | PERROR("malloc"); | |
1401 | goto end; | |
1402 | } | |
1403 | ||
1404 | assert(sizeof(struct lttng_event_exclusion) == | |
1405 | sizeof(struct lttng_ust_event_exclusion)); | |
1406 | memcpy(ust_exclusion, exclusion, exclusion_alloc_size); | |
1407 | end: | |
1408 | return ust_exclusion; | |
1409 | } | |
1410 | ||
7cc9a73c JI |
1411 | /* |
1412 | * Set event exclusions on the tracer. | |
1413 | */ | |
1414 | static | |
1415 | int set_ust_event_exclusion(struct ust_app_event *ua_event, | |
1416 | struct ust_app *app) | |
1417 | { | |
1418 | int ret; | |
51755dc8 | 1419 | struct lttng_ust_event_exclusion *ust_exclusion = NULL; |
7cc9a73c JI |
1420 | |
1421 | health_code_update(); | |
1422 | ||
1423 | if (!ua_event->exclusion || !ua_event->exclusion->count) { | |
1424 | ret = 0; | |
1425 | goto error; | |
1426 | } | |
1427 | ||
51755dc8 JG |
1428 | ust_exclusion = create_ust_exclusion_from_exclusion( |
1429 | ua_event->exclusion); | |
1430 | if (!ust_exclusion) { | |
1431 | ret = -LTTNG_ERR_NOMEM; | |
1432 | goto error; | |
1433 | } | |
fb45065e | 1434 | pthread_mutex_lock(&app->sock_lock); |
51755dc8 | 1435 | ret = ustctl_set_exclusion(app->sock, ust_exclusion, ua_event->obj); |
fb45065e | 1436 | pthread_mutex_unlock(&app->sock_lock); |
7cc9a73c JI |
1437 | if (ret < 0) { |
1438 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1439 | ERR("UST app event %s exclusions failed for app (pid: %d) " | |
1440 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1441 | } else { | |
1442 | /* | |
1443 | * This is normal behavior, an application can die during the | |
1444 | * creation process. Don't report an error so the execution can | |
1445 | * continue normally. | |
1446 | */ | |
1447 | ret = 0; | |
1448 | DBG3("UST app event exclusion failed. Application is dead."); | |
1449 | } | |
1450 | goto error; | |
1451 | } | |
1452 | ||
1453 | DBG2("UST exclusion set successfully for event %s", ua_event->name); | |
1454 | ||
1455 | error: | |
1456 | health_code_update(); | |
51755dc8 | 1457 | free(ust_exclusion); |
7cc9a73c JI |
1458 | return ret; |
1459 | } | |
1460 | ||
9730260e DG |
1461 | /* |
1462 | * Disable the specified event on to UST tracer for the UST session. | |
1463 | */ | |
1464 | static int disable_ust_event(struct ust_app *app, | |
1465 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1466 | { | |
1467 | int ret; | |
1468 | ||
840cb59c | 1469 | health_code_update(); |
86acf0da | 1470 | |
fb45065e | 1471 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1472 | ret = ustctl_disable(app->sock, ua_event->obj); |
fb45065e | 1473 | pthread_mutex_unlock(&app->sock_lock); |
9730260e | 1474 | if (ret < 0) { |
ffe60014 DG |
1475 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1476 | ERR("UST app event %s disable failed for app (pid: %d) " | |
1477 | "and session handle %d with ret %d", | |
1478 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1479 | } else { | |
3757b385 DG |
1480 | /* |
1481 | * This is normal behavior, an application can die during the | |
1482 | * creation process. Don't report an error so the execution can | |
1483 | * continue normally. | |
1484 | */ | |
1485 | ret = 0; | |
ffe60014 DG |
1486 | DBG3("UST app disable event failed. Application is dead."); |
1487 | } | |
9730260e DG |
1488 | goto error; |
1489 | } | |
1490 | ||
1491 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 1492 | ua_event->attr.name, app->pid); |
9730260e DG |
1493 | |
1494 | error: | |
840cb59c | 1495 | health_code_update(); |
9730260e DG |
1496 | return ret; |
1497 | } | |
1498 | ||
78f0bacd DG |
1499 | /* |
1500 | * Disable the specified channel on to UST tracer for the UST session. | |
1501 | */ | |
1502 | static int disable_ust_channel(struct ust_app *app, | |
1503 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1504 | { | |
1505 | int ret; | |
1506 | ||
840cb59c | 1507 | health_code_update(); |
86acf0da | 1508 | |
fb45065e | 1509 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1510 | ret = ustctl_disable(app->sock, ua_chan->obj); |
fb45065e | 1511 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1512 | if (ret < 0) { |
ffe60014 DG |
1513 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1514 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1515 | "and session handle %d with ret %d", | |
1516 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1517 | } else { | |
3757b385 DG |
1518 | /* |
1519 | * This is normal behavior, an application can die during the | |
1520 | * creation process. Don't report an error so the execution can | |
1521 | * continue normally. | |
1522 | */ | |
1523 | ret = 0; | |
ffe60014 DG |
1524 | DBG3("UST app disable channel failed. Application is dead."); |
1525 | } | |
78f0bacd DG |
1526 | goto error; |
1527 | } | |
1528 | ||
78f0bacd | 1529 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1530 | ua_chan->name, app->pid); |
78f0bacd DG |
1531 | |
1532 | error: | |
840cb59c | 1533 | health_code_update(); |
78f0bacd DG |
1534 | return ret; |
1535 | } | |
1536 | ||
1537 | /* | |
1538 | * Enable the specified channel on to UST tracer for the UST session. | |
1539 | */ | |
1540 | static int enable_ust_channel(struct ust_app *app, | |
1541 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1542 | { | |
1543 | int ret; | |
1544 | ||
840cb59c | 1545 | health_code_update(); |
86acf0da | 1546 | |
fb45065e | 1547 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1548 | ret = ustctl_enable(app->sock, ua_chan->obj); |
fb45065e | 1549 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1550 | if (ret < 0) { |
ffe60014 DG |
1551 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1552 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1553 | "and session handle %d with ret %d", | |
1554 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1555 | } else { | |
3757b385 DG |
1556 | /* |
1557 | * This is normal behavior, an application can die during the | |
1558 | * creation process. Don't report an error so the execution can | |
1559 | * continue normally. | |
1560 | */ | |
1561 | ret = 0; | |
ffe60014 DG |
1562 | DBG3("UST app enable channel failed. Application is dead."); |
1563 | } | |
78f0bacd DG |
1564 | goto error; |
1565 | } | |
1566 | ||
1567 | ua_chan->enabled = 1; | |
1568 | ||
1569 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1570 | ua_chan->name, app->pid); |
78f0bacd DG |
1571 | |
1572 | error: | |
840cb59c | 1573 | health_code_update(); |
78f0bacd DG |
1574 | return ret; |
1575 | } | |
1576 | ||
edb67388 DG |
1577 | /* |
1578 | * Enable the specified event on to UST tracer for the UST session. | |
1579 | */ | |
1580 | static int enable_ust_event(struct ust_app *app, | |
1581 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1582 | { | |
1583 | int ret; | |
1584 | ||
840cb59c | 1585 | health_code_update(); |
86acf0da | 1586 | |
fb45065e | 1587 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1588 | ret = ustctl_enable(app->sock, ua_event->obj); |
fb45065e | 1589 | pthread_mutex_unlock(&app->sock_lock); |
edb67388 | 1590 | if (ret < 0) { |
ffe60014 DG |
1591 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1592 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1593 | "and session handle %d with ret %d", | |
1594 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1595 | } else { | |
3757b385 DG |
1596 | /* |
1597 | * This is normal behavior, an application can die during the | |
1598 | * creation process. Don't report an error so the execution can | |
1599 | * continue normally. | |
1600 | */ | |
1601 | ret = 0; | |
ffe60014 DG |
1602 | DBG3("UST app enable event failed. Application is dead."); |
1603 | } | |
edb67388 DG |
1604 | goto error; |
1605 | } | |
1606 | ||
1607 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1608 | ua_event->attr.name, app->pid); |
edb67388 DG |
1609 | |
1610 | error: | |
840cb59c | 1611 | health_code_update(); |
edb67388 DG |
1612 | return ret; |
1613 | } | |
1614 | ||
099e26bd | 1615 | /* |
7972aab2 | 1616 | * Send channel and stream buffer to application. |
4f3ab6ee | 1617 | * |
ffe60014 | 1618 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1619 | */ |
7972aab2 DG |
1620 | static int send_channel_pid_to_ust(struct ust_app *app, |
1621 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1622 | { |
1623 | int ret; | |
ffe60014 | 1624 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1625 | |
1626 | assert(app); | |
ffe60014 | 1627 | assert(ua_sess); |
4f3ab6ee | 1628 | assert(ua_chan); |
4f3ab6ee | 1629 | |
840cb59c | 1630 | health_code_update(); |
4f3ab6ee | 1631 | |
7972aab2 DG |
1632 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1633 | app->sock); | |
86acf0da | 1634 | |
ffe60014 DG |
1635 | /* Send channel to the application. */ |
1636 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
1637 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1638 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1639 | goto error; | |
1640 | } else if (ret < 0) { | |
b551a063 DG |
1641 | goto error; |
1642 | } | |
1643 | ||
d88aee68 DG |
1644 | health_code_update(); |
1645 | ||
ffe60014 DG |
1646 | /* Send all streams to application. */ |
1647 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1648 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
a7169585 MD |
1649 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1650 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1651 | goto error; | |
1652 | } else if (ret < 0) { | |
ffe60014 DG |
1653 | goto error; |
1654 | } | |
1655 | /* We don't need the stream anymore once sent to the tracer. */ | |
1656 | cds_list_del(&stream->list); | |
fb45065e | 1657 | delete_ust_app_stream(-1, stream, app); |
ffe60014 | 1658 | } |
ffe60014 DG |
1659 | /* Flag the channel that it is sent to the application. */ |
1660 | ua_chan->is_sent = 1; | |
ffe60014 | 1661 | |
b551a063 | 1662 | error: |
840cb59c | 1663 | health_code_update(); |
b551a063 DG |
1664 | return ret; |
1665 | } | |
1666 | ||
91d76f53 | 1667 | /* |
5b4a0ec0 | 1668 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1669 | * |
1670 | * Should be called with session mutex held. | |
91d76f53 | 1671 | */ |
edb67388 DG |
1672 | static |
1673 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1674 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1675 | { |
5b4a0ec0 | 1676 | int ret = 0; |
284d8f55 | 1677 | |
840cb59c | 1678 | health_code_update(); |
86acf0da | 1679 | |
5b4a0ec0 | 1680 | /* Create UST event on tracer */ |
fb45065e | 1681 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1682 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 | 1683 | &ua_event->obj); |
fb45065e | 1684 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 | 1685 | if (ret < 0) { |
ffe60014 | 1686 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
88e3c2f5 | 1687 | abort(); |
ffe60014 DG |
1688 | ERR("Error ustctl create event %s for app pid: %d with ret %d", |
1689 | ua_event->attr.name, app->pid, ret); | |
1690 | } else { | |
3757b385 DG |
1691 | /* |
1692 | * This is normal behavior, an application can die during the | |
1693 | * creation process. Don't report an error so the execution can | |
1694 | * continue normally. | |
1695 | */ | |
1696 | ret = 0; | |
ffe60014 DG |
1697 | DBG3("UST app create event failed. Application is dead."); |
1698 | } | |
5b4a0ec0 | 1699 | goto error; |
91d76f53 | 1700 | } |
f6a9efaa | 1701 | |
5b4a0ec0 | 1702 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1703 | |
5b4a0ec0 | 1704 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1705 | ua_event->attr.name, app->pid); |
f6a9efaa | 1706 | |
840cb59c | 1707 | health_code_update(); |
86acf0da | 1708 | |
025faf73 DG |
1709 | /* Set filter if one is present. */ |
1710 | if (ua_event->filter) { | |
1711 | ret = set_ust_event_filter(ua_event, app); | |
1712 | if (ret < 0) { | |
1713 | goto error; | |
1714 | } | |
1715 | } | |
1716 | ||
7cc9a73c JI |
1717 | /* Set exclusions for the event */ |
1718 | if (ua_event->exclusion) { | |
1719 | ret = set_ust_event_exclusion(ua_event, app); | |
1720 | if (ret < 0) { | |
1721 | goto error; | |
1722 | } | |
1723 | } | |
1724 | ||
8535a6d9 | 1725 | /* If event not enabled, disable it on the tracer */ |
40113787 MD |
1726 | if (ua_event->enabled) { |
1727 | /* | |
1728 | * We now need to explicitly enable the event, since it | |
1729 | * is now disabled at creation. | |
1730 | */ | |
1731 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1732 | if (ret < 0) { | |
1733 | /* | |
1734 | * If we hit an EPERM, something is wrong with our enable call. If | |
1735 | * we get an EEXIST, there is a problem on the tracer side since we | |
1736 | * just created it. | |
1737 | */ | |
1738 | switch (ret) { | |
1739 | case -LTTNG_UST_ERR_PERM: | |
1740 | /* Code flow problem */ | |
1741 | assert(0); | |
1742 | case -LTTNG_UST_ERR_EXIST: | |
1743 | /* It's OK for our use case. */ | |
1744 | ret = 0; | |
1745 | break; | |
1746 | default: | |
1747 | break; | |
1748 | } | |
1749 | goto error; | |
1750 | } | |
8535a6d9 DG |
1751 | } |
1752 | ||
5b4a0ec0 | 1753 | error: |
840cb59c | 1754 | health_code_update(); |
5b4a0ec0 | 1755 | return ret; |
91d76f53 | 1756 | } |
48842b30 | 1757 | |
5b4a0ec0 DG |
1758 | /* |
1759 | * Copy data between an UST app event and a LTT event. | |
1760 | */ | |
421cb601 | 1761 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1762 | struct ltt_ust_event *uevent) |
1763 | { | |
b4ffad32 JI |
1764 | size_t exclusion_alloc_size; |
1765 | ||
48842b30 DG |
1766 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); |
1767 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1768 | ||
fc34caaa DG |
1769 | ua_event->enabled = uevent->enabled; |
1770 | ||
5b4a0ec0 DG |
1771 | /* Copy event attributes */ |
1772 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1773 | ||
53a80697 MD |
1774 | /* Copy filter bytecode */ |
1775 | if (uevent->filter) { | |
51755dc8 | 1776 | ua_event->filter = copy_filter_bytecode(uevent->filter); |
025faf73 | 1777 | /* Filter might be NULL here in case of ENONEM. */ |
53a80697 | 1778 | } |
b4ffad32 JI |
1779 | |
1780 | /* Copy exclusion data */ | |
1781 | if (uevent->exclusion) { | |
51755dc8 | 1782 | exclusion_alloc_size = sizeof(struct lttng_event_exclusion) + |
b4ffad32 JI |
1783 | LTTNG_UST_SYM_NAME_LEN * uevent->exclusion->count; |
1784 | ua_event->exclusion = zmalloc(exclusion_alloc_size); | |
5f8df26c JI |
1785 | if (ua_event->exclusion == NULL) { |
1786 | PERROR("malloc"); | |
1787 | } else { | |
1788 | memcpy(ua_event->exclusion, uevent->exclusion, | |
1789 | exclusion_alloc_size); | |
b4ffad32 JI |
1790 | } |
1791 | } | |
48842b30 DG |
1792 | } |
1793 | ||
5b4a0ec0 DG |
1794 | /* |
1795 | * Copy data between an UST app channel and a LTT channel. | |
1796 | */ | |
421cb601 | 1797 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1798 | struct ltt_ust_channel *uchan) |
1799 | { | |
fc34caaa | 1800 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1801 | |
1802 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1803 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 1804 | |
1624d5b7 JD |
1805 | ua_chan->tracefile_size = uchan->tracefile_size; |
1806 | ua_chan->tracefile_count = uchan->tracefile_count; | |
1807 | ||
ffe60014 DG |
1808 | /* Copy event attributes since the layout is different. */ |
1809 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1810 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1811 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1812 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1813 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
e9404c27 | 1814 | ua_chan->monitor_timer_interval = uchan->monitor_timer_interval; |
ffe60014 | 1815 | ua_chan->attr.output = uchan->attr.output; |
491d1539 MD |
1816 | ua_chan->attr.blocking_timeout = uchan->attr.u.s.blocking_timeout; |
1817 | ||
ffe60014 DG |
1818 | /* |
1819 | * Note that the attribute channel type is not set since the channel on the | |
1820 | * tracing registry side does not have this information. | |
1821 | */ | |
48842b30 | 1822 | |
fc34caaa | 1823 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1824 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1825 | |
fc34caaa | 1826 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1827 | } |
1828 | ||
5b4a0ec0 DG |
1829 | /* |
1830 | * Copy data between a UST app session and a regular LTT session. | |
1831 | */ | |
421cb601 | 1832 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1833 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1834 | { |
477d7741 MD |
1835 | struct tm *timeinfo; |
1836 | char datetime[16]; | |
1837 | int ret; | |
d7ba1388 | 1838 | char tmp_shm_path[PATH_MAX]; |
477d7741 | 1839 | |
940c4592 | 1840 | timeinfo = localtime(&app->registration_time); |
477d7741 | 1841 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); |
48842b30 | 1842 | |
421cb601 | 1843 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1844 | |
7972aab2 DG |
1845 | ua_sess->tracing_id = usess->id; |
1846 | ua_sess->id = get_next_session_id(); | |
470cc211 JG |
1847 | ua_sess->real_credentials.uid = app->uid; |
1848 | ua_sess->real_credentials.gid = app->gid; | |
1849 | ua_sess->effective_credentials.uid = usess->uid; | |
1850 | ua_sess->effective_credentials.gid = usess->gid; | |
7972aab2 DG |
1851 | ua_sess->buffer_type = usess->buffer_type; |
1852 | ua_sess->bits_per_long = app->bits_per_long; | |
6addfa37 | 1853 | |
7972aab2 | 1854 | /* There is only one consumer object per session possible. */ |
6addfa37 | 1855 | consumer_output_get(usess->consumer); |
7972aab2 | 1856 | ua_sess->consumer = usess->consumer; |
6addfa37 | 1857 | |
2bba9e53 | 1858 | ua_sess->output_traces = usess->output_traces; |
ecc48a90 | 1859 | ua_sess->live_timer_interval = usess->live_timer_interval; |
84ad93e8 DG |
1860 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, |
1861 | &usess->metadata_attr); | |
7972aab2 DG |
1862 | |
1863 | switch (ua_sess->buffer_type) { | |
1864 | case LTTNG_BUFFER_PER_PID: | |
1865 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 1866 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
1867 | datetime); |
1868 | break; | |
1869 | case LTTNG_BUFFER_PER_UID: | |
1870 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
470cc211 JG |
1871 | DEFAULT_UST_TRACE_UID_PATH, |
1872 | ua_sess->real_credentials.uid, | |
1873 | app->bits_per_long); | |
7972aab2 DG |
1874 | break; |
1875 | default: | |
1876 | assert(0); | |
1877 | goto error; | |
1878 | } | |
477d7741 MD |
1879 | if (ret < 0) { |
1880 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1881 | assert(0); |
7972aab2 | 1882 | goto error; |
477d7741 MD |
1883 | } |
1884 | ||
3d071855 MD |
1885 | strncpy(ua_sess->root_shm_path, usess->root_shm_path, |
1886 | sizeof(ua_sess->root_shm_path)); | |
1887 | ua_sess->root_shm_path[sizeof(ua_sess->root_shm_path) - 1] = '\0'; | |
d7ba1388 MD |
1888 | strncpy(ua_sess->shm_path, usess->shm_path, |
1889 | sizeof(ua_sess->shm_path)); | |
1890 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
1891 | if (ua_sess->shm_path[0]) { | |
1892 | switch (ua_sess->buffer_type) { | |
1893 | case LTTNG_BUFFER_PER_PID: | |
1894 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
1895 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", | |
1896 | app->name, app->pid, datetime); | |
1897 | break; | |
1898 | case LTTNG_BUFFER_PER_UID: | |
1899 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
1900 | DEFAULT_UST_TRACE_UID_PATH, | |
1901 | app->uid, app->bits_per_long); | |
1902 | break; | |
1903 | default: | |
1904 | assert(0); | |
1905 | goto error; | |
1906 | } | |
1907 | if (ret < 0) { | |
1908 | PERROR("sprintf UST shadow copy session"); | |
1909 | assert(0); | |
1910 | goto error; | |
1911 | } | |
1912 | strncat(ua_sess->shm_path, tmp_shm_path, | |
1913 | sizeof(ua_sess->shm_path) - strlen(ua_sess->shm_path) - 1); | |
1914 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
1915 | } | |
6addfa37 | 1916 | return; |
7972aab2 DG |
1917 | |
1918 | error: | |
6addfa37 | 1919 | consumer_output_put(ua_sess->consumer); |
48842b30 DG |
1920 | } |
1921 | ||
78f0bacd DG |
1922 | /* |
1923 | * Lookup sesison wrapper. | |
1924 | */ | |
84cd17c6 | 1925 | static |
fb9a95c4 | 1926 | void __lookup_session_by_app(const struct ltt_ust_session *usess, |
bec39940 | 1927 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1928 | { |
1929 | /* Get right UST app session from app */ | |
d9bf3ca4 | 1930 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
1931 | } |
1932 | ||
421cb601 DG |
1933 | /* |
1934 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1935 | * id. |
421cb601 | 1936 | */ |
48842b30 | 1937 | static struct ust_app_session *lookup_session_by_app( |
fb9a95c4 | 1938 | const struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1939 | { |
bec39940 | 1940 | struct lttng_ht_iter iter; |
d9bf3ca4 | 1941 | struct lttng_ht_node_u64 *node; |
48842b30 | 1942 | |
84cd17c6 | 1943 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 1944 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
1945 | if (node == NULL) { |
1946 | goto error; | |
1947 | } | |
1948 | ||
1949 | return caa_container_of(node, struct ust_app_session, node); | |
1950 | ||
1951 | error: | |
1952 | return NULL; | |
1953 | } | |
1954 | ||
7972aab2 DG |
1955 | /* |
1956 | * Setup buffer registry per PID for the given session and application. If none | |
1957 | * is found, a new one is created, added to the global registry and | |
1958 | * initialized. If regp is valid, it's set with the newly created object. | |
1959 | * | |
1960 | * Return 0 on success or else a negative value. | |
1961 | */ | |
1962 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
1963 | struct ust_app *app, struct buffer_reg_pid **regp) | |
1964 | { | |
1965 | int ret = 0; | |
1966 | struct buffer_reg_pid *reg_pid; | |
1967 | ||
1968 | assert(ua_sess); | |
1969 | assert(app); | |
1970 | ||
1971 | rcu_read_lock(); | |
1972 | ||
1973 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
1974 | if (!reg_pid) { | |
1975 | /* | |
1976 | * This is the create channel path meaning that if there is NO | |
1977 | * registry available, we have to create one for this session. | |
1978 | */ | |
d7ba1388 | 1979 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid, |
3d071855 | 1980 | ua_sess->root_shm_path, ua_sess->shm_path); |
7972aab2 DG |
1981 | if (ret < 0) { |
1982 | goto error; | |
1983 | } | |
7972aab2 DG |
1984 | } else { |
1985 | goto end; | |
1986 | } | |
1987 | ||
1988 | /* Initialize registry. */ | |
1989 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
1990 | app->bits_per_long, app->uint8_t_alignment, | |
1991 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf | 1992 | app->uint64_t_alignment, app->long_alignment, |
470cc211 JG |
1993 | app->byte_order, app->version.major, app->version.minor, |
1994 | reg_pid->root_shm_path, reg_pid->shm_path, | |
1995 | ua_sess->effective_credentials.uid, | |
8de88061 JR |
1996 | ua_sess->effective_credentials.gid, ua_sess->tracing_id, |
1997 | app->uid); | |
7972aab2 | 1998 | if (ret < 0) { |
286c991a MD |
1999 | /* |
2000 | * reg_pid->registry->reg.ust is NULL upon error, so we need to | |
2001 | * destroy the buffer registry, because it is always expected | |
2002 | * that if the buffer registry can be found, its ust registry is | |
2003 | * non-NULL. | |
2004 | */ | |
2005 | buffer_reg_pid_destroy(reg_pid); | |
7972aab2 DG |
2006 | goto error; |
2007 | } | |
2008 | ||
286c991a MD |
2009 | buffer_reg_pid_add(reg_pid); |
2010 | ||
7972aab2 DG |
2011 | DBG3("UST app buffer registry per PID created successfully"); |
2012 | ||
2013 | end: | |
2014 | if (regp) { | |
2015 | *regp = reg_pid; | |
2016 | } | |
2017 | error: | |
2018 | rcu_read_unlock(); | |
2019 | return ret; | |
2020 | } | |
2021 | ||
2022 | /* | |
2023 | * Setup buffer registry per UID for the given session and application. If none | |
2024 | * is found, a new one is created, added to the global registry and | |
2025 | * initialized. If regp is valid, it's set with the newly created object. | |
2026 | * | |
2027 | * Return 0 on success or else a negative value. | |
2028 | */ | |
2029 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
d7ba1388 | 2030 | struct ust_app_session *ua_sess, |
7972aab2 DG |
2031 | struct ust_app *app, struct buffer_reg_uid **regp) |
2032 | { | |
2033 | int ret = 0; | |
2034 | struct buffer_reg_uid *reg_uid; | |
2035 | ||
2036 | assert(usess); | |
2037 | assert(app); | |
2038 | ||
2039 | rcu_read_lock(); | |
2040 | ||
2041 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2042 | if (!reg_uid) { | |
2043 | /* | |
2044 | * This is the create channel path meaning that if there is NO | |
2045 | * registry available, we have to create one for this session. | |
2046 | */ | |
2047 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
3d071855 MD |
2048 | LTTNG_DOMAIN_UST, ®_uid, |
2049 | ua_sess->root_shm_path, ua_sess->shm_path); | |
7972aab2 DG |
2050 | if (ret < 0) { |
2051 | goto error; | |
2052 | } | |
7972aab2 DG |
2053 | } else { |
2054 | goto end; | |
2055 | } | |
2056 | ||
2057 | /* Initialize registry. */ | |
af6142cf | 2058 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
2059 | app->bits_per_long, app->uint8_t_alignment, |
2060 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
2061 | app->uint64_t_alignment, app->long_alignment, |
2062 | app->byte_order, app->version.major, | |
3d071855 | 2063 | app->version.minor, reg_uid->root_shm_path, |
8de88061 JR |
2064 | reg_uid->shm_path, usess->uid, usess->gid, |
2065 | ua_sess->tracing_id, app->uid); | |
7972aab2 | 2066 | if (ret < 0) { |
286c991a MD |
2067 | /* |
2068 | * reg_uid->registry->reg.ust is NULL upon error, so we need to | |
2069 | * destroy the buffer registry, because it is always expected | |
2070 | * that if the buffer registry can be found, its ust registry is | |
2071 | * non-NULL. | |
2072 | */ | |
2073 | buffer_reg_uid_destroy(reg_uid, NULL); | |
7972aab2 DG |
2074 | goto error; |
2075 | } | |
2076 | /* Add node to teardown list of the session. */ | |
2077 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
2078 | ||
286c991a | 2079 | buffer_reg_uid_add(reg_uid); |
7972aab2 | 2080 | |
286c991a | 2081 | DBG3("UST app buffer registry per UID created successfully"); |
7972aab2 DG |
2082 | end: |
2083 | if (regp) { | |
2084 | *regp = reg_uid; | |
2085 | } | |
2086 | error: | |
2087 | rcu_read_unlock(); | |
2088 | return ret; | |
2089 | } | |
2090 | ||
421cb601 | 2091 | /* |
3d8ca23b | 2092 | * Create a session on the tracer side for the given app. |
421cb601 | 2093 | * |
3d8ca23b DG |
2094 | * On success, ua_sess_ptr is populated with the session pointer or else left |
2095 | * untouched. If the session was created, is_created is set to 1. On error, | |
2096 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
2097 | * be NULL. | |
2098 | * | |
2099 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
2100 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 2101 | */ |
03f91eaa | 2102 | static int find_or_create_ust_app_session(struct ltt_ust_session *usess, |
3d8ca23b DG |
2103 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, |
2104 | int *is_created) | |
421cb601 | 2105 | { |
3d8ca23b | 2106 | int ret, created = 0; |
421cb601 DG |
2107 | struct ust_app_session *ua_sess; |
2108 | ||
3d8ca23b DG |
2109 | assert(usess); |
2110 | assert(app); | |
2111 | assert(ua_sess_ptr); | |
2112 | ||
840cb59c | 2113 | health_code_update(); |
86acf0da | 2114 | |
421cb601 DG |
2115 | ua_sess = lookup_session_by_app(usess, app); |
2116 | if (ua_sess == NULL) { | |
d9bf3ca4 | 2117 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 2118 | app->pid, usess->id); |
40bbd087 | 2119 | ua_sess = alloc_ust_app_session(); |
421cb601 DG |
2120 | if (ua_sess == NULL) { |
2121 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
2122 | ret = -ENOMEM; |
2123 | goto error; | |
421cb601 | 2124 | } |
477d7741 | 2125 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 2126 | created = 1; |
421cb601 DG |
2127 | } |
2128 | ||
7972aab2 DG |
2129 | switch (usess->buffer_type) { |
2130 | case LTTNG_BUFFER_PER_PID: | |
2131 | /* Init local registry. */ | |
2132 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 2133 | if (ret < 0) { |
e64207cf | 2134 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2135 | goto error; |
2136 | } | |
2137 | break; | |
2138 | case LTTNG_BUFFER_PER_UID: | |
2139 | /* Look for a global registry. If none exists, create one. */ | |
d7ba1388 | 2140 | ret = setup_buffer_reg_uid(usess, ua_sess, app, NULL); |
7972aab2 | 2141 | if (ret < 0) { |
e64207cf | 2142 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2143 | goto error; |
2144 | } | |
2145 | break; | |
2146 | default: | |
2147 | assert(0); | |
2148 | ret = -EINVAL; | |
2149 | goto error; | |
2150 | } | |
2151 | ||
2152 | health_code_update(); | |
2153 | ||
2154 | if (ua_sess->handle == -1) { | |
fb45065e | 2155 | pthread_mutex_lock(&app->sock_lock); |
7972aab2 | 2156 | ret = ustctl_create_session(app->sock); |
fb45065e | 2157 | pthread_mutex_unlock(&app->sock_lock); |
7972aab2 DG |
2158 | if (ret < 0) { |
2159 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
2160 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
2161 | app->pid, ret); |
2162 | } else { | |
2163 | DBG("UST app creating session failed. Application is dead"); | |
3757b385 DG |
2164 | /* |
2165 | * This is normal behavior, an application can die during the | |
2166 | * creation process. Don't report an error so the execution can | |
2167 | * continue normally. This will get flagged ENOTCONN and the | |
2168 | * caller will handle it. | |
2169 | */ | |
2170 | ret = 0; | |
ffe60014 | 2171 | } |
d0b96690 | 2172 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
2173 | if (ret != -ENOMEM) { |
2174 | /* | |
2175 | * Tracer is probably gone or got an internal error so let's | |
2176 | * behave like it will soon unregister or not usable. | |
2177 | */ | |
2178 | ret = -ENOTCONN; | |
2179 | } | |
2180 | goto error; | |
421cb601 DG |
2181 | } |
2182 | ||
7972aab2 DG |
2183 | ua_sess->handle = ret; |
2184 | ||
2185 | /* Add ust app session to app's HT */ | |
d9bf3ca4 MD |
2186 | lttng_ht_node_init_u64(&ua_sess->node, |
2187 | ua_sess->tracing_id); | |
2188 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
10b56aef MD |
2189 | lttng_ht_node_init_ulong(&ua_sess->ust_objd_node, ua_sess->handle); |
2190 | lttng_ht_add_unique_ulong(app->ust_sessions_objd, | |
2191 | &ua_sess->ust_objd_node); | |
7972aab2 DG |
2192 | |
2193 | DBG2("UST app session created successfully with handle %d", ret); | |
2194 | } | |
2195 | ||
2196 | *ua_sess_ptr = ua_sess; | |
2197 | if (is_created) { | |
2198 | *is_created = created; | |
2199 | } | |
2200 | ||
2201 | /* Everything went well. */ | |
2202 | ret = 0; | |
2203 | ||
2204 | error: | |
2205 | health_code_update(); | |
2206 | return ret; | |
2207 | } | |
2208 | ||
6a6b2068 JG |
2209 | /* |
2210 | * Match function for a hash table lookup of ust_app_ctx. | |
2211 | * | |
2212 | * It matches an ust app context based on the context type and, in the case | |
2213 | * of perf counters, their name. | |
2214 | */ | |
2215 | static int ht_match_ust_app_ctx(struct cds_lfht_node *node, const void *_key) | |
2216 | { | |
2217 | struct ust_app_ctx *ctx; | |
bdf64013 | 2218 | const struct lttng_ust_context_attr *key; |
6a6b2068 JG |
2219 | |
2220 | assert(node); | |
2221 | assert(_key); | |
2222 | ||
2223 | ctx = caa_container_of(node, struct ust_app_ctx, node.node); | |
2224 | key = _key; | |
2225 | ||
2226 | /* Context type */ | |
2227 | if (ctx->ctx.ctx != key->ctx) { | |
2228 | goto no_match; | |
2229 | } | |
2230 | ||
bdf64013 JG |
2231 | switch(key->ctx) { |
2232 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: | |
6a6b2068 | 2233 | if (strncmp(key->u.perf_counter.name, |
bdf64013 JG |
2234 | ctx->ctx.u.perf_counter.name, |
2235 | sizeof(key->u.perf_counter.name))) { | |
2236 | goto no_match; | |
2237 | } | |
2238 | break; | |
2239 | case LTTNG_UST_CONTEXT_APP_CONTEXT: | |
2240 | if (strcmp(key->u.app_ctx.provider_name, | |
2241 | ctx->ctx.u.app_ctx.provider_name) || | |
2242 | strcmp(key->u.app_ctx.ctx_name, | |
2243 | ctx->ctx.u.app_ctx.ctx_name)) { | |
6a6b2068 JG |
2244 | goto no_match; |
2245 | } | |
bdf64013 JG |
2246 | break; |
2247 | default: | |
2248 | break; | |
6a6b2068 JG |
2249 | } |
2250 | ||
2251 | /* Match. */ | |
2252 | return 1; | |
2253 | ||
2254 | no_match: | |
2255 | return 0; | |
2256 | } | |
2257 | ||
2258 | /* | |
2259 | * Lookup for an ust app context from an lttng_ust_context. | |
2260 | * | |
be184a0f | 2261 | * Must be called while holding RCU read side lock. |
6a6b2068 JG |
2262 | * Return an ust_app_ctx object or NULL on error. |
2263 | */ | |
2264 | static | |
2265 | struct ust_app_ctx *find_ust_app_context(struct lttng_ht *ht, | |
bdf64013 | 2266 | struct lttng_ust_context_attr *uctx) |
6a6b2068 JG |
2267 | { |
2268 | struct lttng_ht_iter iter; | |
2269 | struct lttng_ht_node_ulong *node; | |
2270 | struct ust_app_ctx *app_ctx = NULL; | |
2271 | ||
2272 | assert(uctx); | |
2273 | assert(ht); | |
2274 | ||
2275 | /* Lookup using the lttng_ust_context_type and a custom match fct. */ | |
2276 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) uctx->ctx, lttng_ht_seed), | |
2277 | ht_match_ust_app_ctx, uctx, &iter.iter); | |
2278 | node = lttng_ht_iter_get_node_ulong(&iter); | |
2279 | if (!node) { | |
2280 | goto end; | |
2281 | } | |
2282 | ||
2283 | app_ctx = caa_container_of(node, struct ust_app_ctx, node); | |
2284 | ||
2285 | end: | |
2286 | return app_ctx; | |
2287 | } | |
2288 | ||
7972aab2 DG |
2289 | /* |
2290 | * Create a context for the channel on the tracer. | |
2291 | * | |
2292 | * Called with UST app session lock held and a RCU read side lock. | |
2293 | */ | |
2294 | static | |
c9edf082 | 2295 | int create_ust_app_channel_context(struct ust_app_channel *ua_chan, |
bdf64013 | 2296 | struct lttng_ust_context_attr *uctx, |
7972aab2 DG |
2297 | struct ust_app *app) |
2298 | { | |
2299 | int ret = 0; | |
7972aab2 DG |
2300 | struct ust_app_ctx *ua_ctx; |
2301 | ||
2302 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
2303 | ||
6a6b2068 JG |
2304 | ua_ctx = find_ust_app_context(ua_chan->ctx, uctx); |
2305 | if (ua_ctx) { | |
7972aab2 DG |
2306 | ret = -EEXIST; |
2307 | goto error; | |
2308 | } | |
2309 | ||
2310 | ua_ctx = alloc_ust_app_ctx(uctx); | |
2311 | if (ua_ctx == NULL) { | |
2312 | /* malloc failed */ | |
7682f304 | 2313 | ret = -ENOMEM; |
7972aab2 DG |
2314 | goto error; |
2315 | } | |
2316 | ||
2317 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 2318 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 2319 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
2320 | |
2321 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
2322 | if (ret < 0) { | |
2323 | goto error; | |
2324 | } | |
2325 | ||
2326 | error: | |
2327 | return ret; | |
2328 | } | |
2329 | ||
2330 | /* | |
2331 | * Enable on the tracer side a ust app event for the session and channel. | |
2332 | * | |
2333 | * Called with UST app session lock held. | |
2334 | */ | |
2335 | static | |
2336 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
2337 | struct ust_app_event *ua_event, struct ust_app *app) | |
2338 | { | |
2339 | int ret; | |
2340 | ||
2341 | ret = enable_ust_event(app, ua_sess, ua_event); | |
2342 | if (ret < 0) { | |
2343 | goto error; | |
2344 | } | |
2345 | ||
2346 | ua_event->enabled = 1; | |
2347 | ||
2348 | error: | |
2349 | return ret; | |
2350 | } | |
2351 | ||
2352 | /* | |
2353 | * Disable on the tracer side a ust app event for the session and channel. | |
2354 | */ | |
2355 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
2356 | struct ust_app_event *ua_event, struct ust_app *app) | |
2357 | { | |
2358 | int ret; | |
2359 | ||
2360 | ret = disable_ust_event(app, ua_sess, ua_event); | |
2361 | if (ret < 0) { | |
2362 | goto error; | |
2363 | } | |
2364 | ||
2365 | ua_event->enabled = 0; | |
2366 | ||
2367 | error: | |
2368 | return ret; | |
2369 | } | |
2370 | ||
2371 | /* | |
2372 | * Lookup ust app channel for session and disable it on the tracer side. | |
2373 | */ | |
2374 | static | |
2375 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
2376 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
2377 | { | |
2378 | int ret; | |
2379 | ||
2380 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2381 | if (ret < 0) { | |
2382 | goto error; | |
2383 | } | |
2384 | ||
2385 | ua_chan->enabled = 0; | |
2386 | ||
2387 | error: | |
2388 | return ret; | |
2389 | } | |
2390 | ||
2391 | /* | |
2392 | * Lookup ust app channel for session and enable it on the tracer side. This | |
2393 | * MUST be called with a RCU read side lock acquired. | |
2394 | */ | |
2395 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
2396 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
2397 | { | |
2398 | int ret = 0; | |
2399 | struct lttng_ht_iter iter; | |
2400 | struct lttng_ht_node_str *ua_chan_node; | |
2401 | struct ust_app_channel *ua_chan; | |
2402 | ||
2403 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
2404 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
2405 | if (ua_chan_node == NULL) { | |
d9bf3ca4 | 2406 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
2407 | uchan->name, ua_sess->tracing_id); |
2408 | goto error; | |
2409 | } | |
2410 | ||
2411 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2412 | ||
2413 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
2414 | if (ret < 0) { | |
2415 | goto error; | |
2416 | } | |
2417 | ||
2418 | error: | |
2419 | return ret; | |
2420 | } | |
2421 | ||
2422 | /* | |
2423 | * Ask the consumer to create a channel and get it if successful. | |
2424 | * | |
fad1ed2f JR |
2425 | * Called with UST app session lock held. |
2426 | * | |
7972aab2 DG |
2427 | * Return 0 on success or else a negative value. |
2428 | */ | |
2429 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
2430 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
e098433c JG |
2431 | int bitness, struct ust_registry_session *registry, |
2432 | uint64_t trace_archive_id) | |
7972aab2 DG |
2433 | { |
2434 | int ret; | |
2435 | unsigned int nb_fd = 0; | |
2436 | struct consumer_socket *socket; | |
2437 | ||
2438 | assert(usess); | |
2439 | assert(ua_sess); | |
2440 | assert(ua_chan); | |
2441 | assert(registry); | |
2442 | ||
2443 | rcu_read_lock(); | |
2444 | health_code_update(); | |
2445 | ||
2446 | /* Get the right consumer socket for the application. */ | |
2447 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
2448 | if (!socket) { | |
2449 | ret = -EINVAL; | |
2450 | goto error; | |
2451 | } | |
2452 | ||
2453 | health_code_update(); | |
2454 | ||
2455 | /* Need one fd for the channel. */ | |
2456 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2457 | if (ret < 0) { | |
2458 | ERR("Exhausted number of available FD upon create channel"); | |
2459 | goto error; | |
2460 | } | |
2461 | ||
2462 | /* | |
2463 | * Ask consumer to create channel. The consumer will return the number of | |
2464 | * stream we have to expect. | |
2465 | */ | |
2466 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
d2956687 | 2467 | registry, usess->current_trace_chunk); |
7972aab2 DG |
2468 | if (ret < 0) { |
2469 | goto error_ask; | |
2470 | } | |
2471 | ||
2472 | /* | |
2473 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2474 | * stream (2 being the default value here). | |
2475 | */ | |
2476 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2477 | ||
2478 | /* Reserve the amount of file descriptor we need. */ | |
2479 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2480 | if (ret < 0) { | |
2481 | ERR("Exhausted number of available FD upon create channel"); | |
2482 | goto error_fd_get_stream; | |
2483 | } | |
2484 | ||
2485 | health_code_update(); | |
2486 | ||
2487 | /* | |
2488 | * Now get the channel from the consumer. This call wil populate the stream | |
2489 | * list of that channel and set the ust objects. | |
2490 | */ | |
d9078d0c DG |
2491 | if (usess->consumer->enabled) { |
2492 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2493 | if (ret < 0) { | |
2494 | goto error_destroy; | |
2495 | } | |
7972aab2 DG |
2496 | } |
2497 | ||
2498 | rcu_read_unlock(); | |
2499 | return 0; | |
2500 | ||
2501 | error_destroy: | |
2502 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2503 | error_fd_get_stream: | |
2504 | /* | |
2505 | * Initiate a destroy channel on the consumer since we had an error | |
2506 | * handling it on our side. The return value is of no importance since we | |
2507 | * already have a ret value set by the previous error that we need to | |
2508 | * return. | |
2509 | */ | |
2510 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2511 | error_ask: | |
2512 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2513 | error: | |
2514 | health_code_update(); | |
2515 | rcu_read_unlock(); | |
2516 | return ret; | |
2517 | } | |
2518 | ||
2519 | /* | |
2520 | * Duplicate the ust data object of the ust app stream and save it in the | |
2521 | * buffer registry stream. | |
2522 | * | |
2523 | * Return 0 on success or else a negative value. | |
2524 | */ | |
2525 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2526 | struct ust_app_stream *stream) | |
2527 | { | |
2528 | int ret; | |
2529 | ||
2530 | assert(reg_stream); | |
2531 | assert(stream); | |
2532 | ||
2533 | /* Reserve the amount of file descriptor we need. */ | |
2534 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2535 | if (ret < 0) { | |
2536 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2537 | goto error; | |
2538 | } | |
2539 | ||
2540 | /* Duplicate object for stream once the original is in the registry. */ | |
2541 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2542 | reg_stream->obj.ust); | |
2543 | if (ret < 0) { | |
2544 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2545 | reg_stream->obj.ust, stream->obj, ret); | |
2546 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2547 | goto error; | |
2548 | } | |
2549 | stream->handle = stream->obj->handle; | |
2550 | ||
2551 | error: | |
2552 | return ret; | |
2553 | } | |
2554 | ||
2555 | /* | |
2556 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2557 | * buffer registry channel. | |
2558 | * | |
2559 | * Return 0 on success or else a negative value. | |
2560 | */ | |
2561 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2562 | struct ust_app_channel *ua_chan) | |
2563 | { | |
2564 | int ret; | |
2565 | ||
2566 | assert(reg_chan); | |
2567 | assert(ua_chan); | |
2568 | ||
2569 | /* Need two fds for the channel. */ | |
2570 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2571 | if (ret < 0) { | |
2572 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2573 | goto error_fd_get; | |
2574 | } | |
2575 | ||
2576 | /* Duplicate object for stream once the original is in the registry. */ | |
2577 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2578 | if (ret < 0) { | |
2579 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2580 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2581 | goto error; | |
2582 | } | |
2583 | ua_chan->handle = ua_chan->obj->handle; | |
2584 | ||
2585 | return 0; | |
2586 | ||
2587 | error: | |
2588 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2589 | error_fd_get: | |
2590 | return ret; | |
2591 | } | |
2592 | ||
2593 | /* | |
2594 | * For a given channel buffer registry, setup all streams of the given ust | |
2595 | * application channel. | |
2596 | * | |
2597 | * Return 0 on success or else a negative value. | |
2598 | */ | |
2599 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
fb45065e MD |
2600 | struct ust_app_channel *ua_chan, |
2601 | struct ust_app *app) | |
7972aab2 DG |
2602 | { |
2603 | int ret = 0; | |
2604 | struct ust_app_stream *stream, *stmp; | |
2605 | ||
2606 | assert(reg_chan); | |
2607 | assert(ua_chan); | |
2608 | ||
2609 | DBG2("UST app setup buffer registry stream"); | |
2610 | ||
2611 | /* Send all streams to application. */ | |
2612 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2613 | struct buffer_reg_stream *reg_stream; | |
2614 | ||
2615 | ret = buffer_reg_stream_create(®_stream); | |
2616 | if (ret < 0) { | |
2617 | goto error; | |
2618 | } | |
2619 | ||
2620 | /* | |
2621 | * Keep original pointer and nullify it in the stream so the delete | |
2622 | * stream call does not release the object. | |
2623 | */ | |
2624 | reg_stream->obj.ust = stream->obj; | |
2625 | stream->obj = NULL; | |
2626 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2627 | |
7972aab2 DG |
2628 | /* We don't need the streams anymore. */ |
2629 | cds_list_del(&stream->list); | |
fb45065e | 2630 | delete_ust_app_stream(-1, stream, app); |
7972aab2 | 2631 | } |
421cb601 | 2632 | |
7972aab2 DG |
2633 | error: |
2634 | return ret; | |
2635 | } | |
2636 | ||
2637 | /* | |
2638 | * Create a buffer registry channel for the given session registry and | |
2639 | * application channel object. If regp pointer is valid, it's set with the | |
2640 | * created object. Important, the created object is NOT added to the session | |
2641 | * registry hash table. | |
2642 | * | |
2643 | * Return 0 on success else a negative value. | |
2644 | */ | |
2645 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2646 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2647 | { | |
2648 | int ret; | |
2649 | struct buffer_reg_channel *reg_chan = NULL; | |
2650 | ||
2651 | assert(reg_sess); | |
2652 | assert(ua_chan); | |
2653 | ||
2654 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2655 | ||
2656 | /* Create buffer registry channel. */ | |
2657 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2658 | if (ret < 0) { | |
2659 | goto error_create; | |
421cb601 | 2660 | } |
7972aab2 DG |
2661 | assert(reg_chan); |
2662 | reg_chan->consumer_key = ua_chan->key; | |
8c924c7b | 2663 | reg_chan->subbuf_size = ua_chan->attr.subbuf_size; |
d07ceecd | 2664 | reg_chan->num_subbuf = ua_chan->attr.num_subbuf; |
421cb601 | 2665 | |
7972aab2 DG |
2666 | /* Create and add a channel registry to session. */ |
2667 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2668 | ua_chan->tracing_channel_id); | |
2669 | if (ret < 0) { | |
2670 | goto error; | |
d88aee68 | 2671 | } |
7972aab2 | 2672 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2673 | |
7972aab2 DG |
2674 | if (regp) { |
2675 | *regp = reg_chan; | |
3d8ca23b | 2676 | } |
d88aee68 | 2677 | |
7972aab2 | 2678 | return 0; |
3d8ca23b DG |
2679 | |
2680 | error: | |
7972aab2 DG |
2681 | /* Safe because the registry channel object was not added to any HT. */ |
2682 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2683 | error_create: | |
3d8ca23b | 2684 | return ret; |
421cb601 DG |
2685 | } |
2686 | ||
55cc08a6 | 2687 | /* |
7972aab2 DG |
2688 | * Setup buffer registry channel for the given session registry and application |
2689 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2690 | * |
7972aab2 | 2691 | * Return 0 on success else a negative value. |
55cc08a6 | 2692 | */ |
7972aab2 | 2693 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
fb45065e MD |
2694 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan, |
2695 | struct ust_app *app) | |
55cc08a6 | 2696 | { |
7972aab2 | 2697 | int ret; |
55cc08a6 | 2698 | |
7972aab2 DG |
2699 | assert(reg_sess); |
2700 | assert(reg_chan); | |
2701 | assert(ua_chan); | |
2702 | assert(ua_chan->obj); | |
55cc08a6 | 2703 | |
7972aab2 | 2704 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2705 | |
7972aab2 | 2706 | /* Setup all streams for the registry. */ |
fb45065e | 2707 | ret = setup_buffer_reg_streams(reg_chan, ua_chan, app); |
7972aab2 | 2708 | if (ret < 0) { |
55cc08a6 DG |
2709 | goto error; |
2710 | } | |
2711 | ||
7972aab2 DG |
2712 | reg_chan->obj.ust = ua_chan->obj; |
2713 | ua_chan->obj = NULL; | |
55cc08a6 | 2714 | |
7972aab2 | 2715 | return 0; |
55cc08a6 DG |
2716 | |
2717 | error: | |
7972aab2 DG |
2718 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2719 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2720 | return ret; |
2721 | } | |
2722 | ||
edb67388 | 2723 | /* |
7972aab2 | 2724 | * Send buffer registry channel to the application. |
d0b96690 | 2725 | * |
7972aab2 | 2726 | * Return 0 on success else a negative value. |
edb67388 | 2727 | */ |
7972aab2 DG |
2728 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2729 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2730 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2731 | { |
2732 | int ret; | |
7972aab2 | 2733 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2734 | |
7972aab2 DG |
2735 | assert(reg_chan); |
2736 | assert(app); | |
2737 | assert(ua_sess); | |
2738 | assert(ua_chan); | |
2739 | ||
2740 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2741 | ||
2742 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2743 | if (ret < 0) { |
2744 | goto error; | |
2745 | } | |
2746 | ||
7972aab2 DG |
2747 | /* Send channel to the application. */ |
2748 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
2749 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
2750 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
2751 | goto error; | |
2752 | } else if (ret < 0) { | |
7972aab2 DG |
2753 | goto error; |
2754 | } | |
2755 | ||
2756 | health_code_update(); | |
2757 | ||
2758 | /* Send all streams to application. */ | |
2759 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2760 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2761 | struct ust_app_stream stream; | |
2762 | ||
2763 | ret = duplicate_stream_object(reg_stream, &stream); | |
2764 | if (ret < 0) { | |
2765 | goto error_stream_unlock; | |
2766 | } | |
2767 | ||
2768 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2769 | if (ret < 0) { | |
fb45065e | 2770 | (void) release_ust_app_stream(-1, &stream, app); |
a7169585 MD |
2771 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
2772 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
a7169585 | 2773 | } |
7972aab2 DG |
2774 | goto error_stream_unlock; |
2775 | } | |
edb67388 | 2776 | |
7972aab2 DG |
2777 | /* |
2778 | * The return value is not important here. This function will output an | |
2779 | * error if needed. | |
2780 | */ | |
fb45065e | 2781 | (void) release_ust_app_stream(-1, &stream, app); |
7972aab2 DG |
2782 | } |
2783 | ua_chan->is_sent = 1; | |
2784 | ||
2785 | error_stream_unlock: | |
2786 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2787 | error: |
2788 | return ret; | |
2789 | } | |
2790 | ||
9730260e | 2791 | /* |
7972aab2 DG |
2792 | * Create and send to the application the created buffers with per UID buffers. |
2793 | * | |
9acdc1d6 | 2794 | * This MUST be called with a RCU read side lock acquired. |
71e0a100 | 2795 | * The session list lock and the session's lock must be acquired. |
9acdc1d6 | 2796 | * |
7972aab2 | 2797 | * Return 0 on success else a negative value. |
9730260e | 2798 | */ |
7972aab2 DG |
2799 | static int create_channel_per_uid(struct ust_app *app, |
2800 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2801 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2802 | { |
2803 | int ret; | |
7972aab2 DG |
2804 | struct buffer_reg_uid *reg_uid; |
2805 | struct buffer_reg_channel *reg_chan; | |
e32d7f27 | 2806 | struct ltt_session *session = NULL; |
e098433c JG |
2807 | enum lttng_error_code notification_ret; |
2808 | struct ust_registry_channel *chan_reg; | |
9730260e | 2809 | |
7972aab2 DG |
2810 | assert(app); |
2811 | assert(usess); | |
2812 | assert(ua_sess); | |
2813 | assert(ua_chan); | |
2814 | ||
2815 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2816 | ||
2817 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2818 | /* | |
2819 | * The session creation handles the creation of this global registry | |
2820 | * object. If none can be find, there is a code flow problem or a | |
2821 | * teardown race. | |
2822 | */ | |
2823 | assert(reg_uid); | |
2824 | ||
2825 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2826 | reg_uid); | |
2721f7ea JG |
2827 | if (reg_chan) { |
2828 | goto send_channel; | |
2829 | } | |
7972aab2 | 2830 | |
2721f7ea JG |
2831 | /* Create the buffer registry channel object. */ |
2832 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2833 | if (ret < 0) { | |
2834 | ERR("Error creating the UST channel \"%s\" registry instance", | |
f14256d6 | 2835 | ua_chan->name); |
2721f7ea JG |
2836 | goto error; |
2837 | } | |
f14256d6 | 2838 | |
e098433c JG |
2839 | session = session_find_by_id(ua_sess->tracing_id); |
2840 | assert(session); | |
2841 | assert(pthread_mutex_trylock(&session->lock)); | |
2842 | assert(session_trylock_list()); | |
2843 | ||
2721f7ea JG |
2844 | /* |
2845 | * Create the buffers on the consumer side. This call populates the | |
2846 | * ust app channel object with all streams and data object. | |
2847 | */ | |
2848 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
e098433c | 2849 | app->bits_per_long, reg_uid->registry->reg.ust, |
d2956687 | 2850 | session->most_recent_chunk_id.value); |
2721f7ea JG |
2851 | if (ret < 0) { |
2852 | ERR("Error creating UST channel \"%s\" on the consumer daemon", | |
2853 | ua_chan->name); | |
7972aab2 DG |
2854 | |
2855 | /* | |
2721f7ea JG |
2856 | * Let's remove the previously created buffer registry channel so |
2857 | * it's not visible anymore in the session registry. | |
7972aab2 | 2858 | */ |
2721f7ea JG |
2859 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, |
2860 | ua_chan->tracing_channel_id, false); | |
2861 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
2862 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2863 | goto error; | |
7972aab2 DG |
2864 | } |
2865 | ||
2721f7ea JG |
2866 | /* |
2867 | * Setup the streams and add it to the session registry. | |
2868 | */ | |
2869 | ret = setup_buffer_reg_channel(reg_uid->registry, | |
2870 | ua_chan, reg_chan, app); | |
2871 | if (ret < 0) { | |
2872 | ERR("Error setting up UST channel \"%s\"", ua_chan->name); | |
2873 | goto error; | |
2874 | } | |
2875 | ||
e098433c JG |
2876 | /* Notify the notification subsystem of the channel's creation. */ |
2877 | pthread_mutex_lock(®_uid->registry->reg.ust->lock); | |
2878 | chan_reg = ust_registry_channel_find(reg_uid->registry->reg.ust, | |
2879 | ua_chan->tracing_channel_id); | |
2880 | assert(chan_reg); | |
2881 | chan_reg->consumer_key = ua_chan->key; | |
2882 | chan_reg = NULL; | |
2883 | pthread_mutex_unlock(®_uid->registry->reg.ust->lock); | |
e9404c27 | 2884 | |
e098433c JG |
2885 | notification_ret = notification_thread_command_add_channel( |
2886 | notification_thread_handle, session->name, | |
470cc211 JG |
2887 | ua_sess->effective_credentials.uid, |
2888 | ua_sess->effective_credentials.gid, ua_chan->name, | |
2889 | ua_chan->key, LTTNG_DOMAIN_UST, | |
e098433c JG |
2890 | ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf); |
2891 | if (notification_ret != LTTNG_OK) { | |
2892 | ret = - (int) notification_ret; | |
2893 | ERR("Failed to add channel to notification thread"); | |
2894 | goto error; | |
e9404c27 JG |
2895 | } |
2896 | ||
2721f7ea | 2897 | send_channel: |
66ff8e3f JG |
2898 | /* Send buffers to the application. */ |
2899 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
2900 | if (ret < 0) { | |
2901 | if (ret != -ENOTCONN) { | |
2902 | ERR("Error sending channel to application"); | |
2903 | } | |
2904 | goto error; | |
2905 | } | |
2906 | ||
9730260e | 2907 | error: |
e32d7f27 JG |
2908 | if (session) { |
2909 | session_put(session); | |
2910 | } | |
9730260e DG |
2911 | return ret; |
2912 | } | |
2913 | ||
78f0bacd | 2914 | /* |
7972aab2 DG |
2915 | * Create and send to the application the created buffers with per PID buffers. |
2916 | * | |
fad1ed2f | 2917 | * Called with UST app session lock held. |
71e0a100 | 2918 | * The session list lock and the session's lock must be acquired. |
fad1ed2f | 2919 | * |
7972aab2 | 2920 | * Return 0 on success else a negative value. |
78f0bacd | 2921 | */ |
7972aab2 DG |
2922 | static int create_channel_per_pid(struct ust_app *app, |
2923 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2924 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2925 | { |
8535a6d9 | 2926 | int ret; |
7972aab2 | 2927 | struct ust_registry_session *registry; |
e9404c27 | 2928 | enum lttng_error_code cmd_ret; |
e32d7f27 | 2929 | struct ltt_session *session = NULL; |
e9404c27 JG |
2930 | uint64_t chan_reg_key; |
2931 | struct ust_registry_channel *chan_reg; | |
78f0bacd | 2932 | |
7972aab2 DG |
2933 | assert(app); |
2934 | assert(usess); | |
2935 | assert(ua_sess); | |
2936 | assert(ua_chan); | |
2937 | ||
2938 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2939 | ||
2940 | rcu_read_lock(); | |
2941 | ||
2942 | registry = get_session_registry(ua_sess); | |
fad1ed2f | 2943 | /* The UST app session lock is held, registry shall not be null. */ |
7972aab2 DG |
2944 | assert(registry); |
2945 | ||
2946 | /* Create and add a new channel registry to session. */ | |
2947 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd | 2948 | if (ret < 0) { |
f14256d6 MD |
2949 | ERR("Error creating the UST channel \"%s\" registry instance", |
2950 | ua_chan->name); | |
78f0bacd DG |
2951 | goto error; |
2952 | } | |
2953 | ||
e098433c JG |
2954 | session = session_find_by_id(ua_sess->tracing_id); |
2955 | assert(session); | |
2956 | ||
2957 | assert(pthread_mutex_trylock(&session->lock)); | |
2958 | assert(session_trylock_list()); | |
2959 | ||
7972aab2 DG |
2960 | /* Create and get channel on the consumer side. */ |
2961 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
e098433c | 2962 | app->bits_per_long, registry, |
d2956687 | 2963 | session->most_recent_chunk_id.value); |
7972aab2 | 2964 | if (ret < 0) { |
f14256d6 MD |
2965 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
2966 | ua_chan->name); | |
5b951542 | 2967 | goto error_remove_from_registry; |
7972aab2 DG |
2968 | } |
2969 | ||
2970 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
2971 | if (ret < 0) { | |
a7169585 MD |
2972 | if (ret != -ENOTCONN) { |
2973 | ERR("Error sending channel to application"); | |
2974 | } | |
5b951542 | 2975 | goto error_remove_from_registry; |
7972aab2 | 2976 | } |
8535a6d9 | 2977 | |
e9404c27 JG |
2978 | chan_reg_key = ua_chan->key; |
2979 | pthread_mutex_lock(®istry->lock); | |
2980 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
2981 | assert(chan_reg); | |
2982 | chan_reg->consumer_key = ua_chan->key; | |
2983 | pthread_mutex_unlock(®istry->lock); | |
2984 | ||
2985 | cmd_ret = notification_thread_command_add_channel( | |
2986 | notification_thread_handle, session->name, | |
470cc211 JG |
2987 | ua_sess->effective_credentials.uid, |
2988 | ua_sess->effective_credentials.gid, ua_chan->name, | |
2989 | ua_chan->key, LTTNG_DOMAIN_UST, | |
e9404c27 JG |
2990 | ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf); |
2991 | if (cmd_ret != LTTNG_OK) { | |
2992 | ret = - (int) cmd_ret; | |
2993 | ERR("Failed to add channel to notification thread"); | |
5b951542 | 2994 | goto error_remove_from_registry; |
e9404c27 JG |
2995 | } |
2996 | ||
5b951542 MD |
2997 | error_remove_from_registry: |
2998 | if (ret) { | |
2999 | ust_registry_channel_del_free(registry, ua_chan->key, false); | |
3000 | } | |
78f0bacd | 3001 | error: |
7972aab2 | 3002 | rcu_read_unlock(); |
e32d7f27 JG |
3003 | if (session) { |
3004 | session_put(session); | |
3005 | } | |
78f0bacd DG |
3006 | return ret; |
3007 | } | |
3008 | ||
3009 | /* | |
7972aab2 | 3010 | * From an already allocated ust app channel, create the channel buffers if |
88e3c2f5 | 3011 | * needed and send them to the application. This MUST be called with a RCU read |
7972aab2 DG |
3012 | * side lock acquired. |
3013 | * | |
fad1ed2f JR |
3014 | * Called with UST app session lock held. |
3015 | * | |
a7169585 MD |
3016 | * Return 0 on success or else a negative value. Returns -ENOTCONN if |
3017 | * the application exited concurrently. | |
78f0bacd | 3018 | */ |
88e3c2f5 | 3019 | static int ust_app_channel_send(struct ust_app *app, |
7972aab2 DG |
3020 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, |
3021 | struct ust_app_channel *ua_chan) | |
78f0bacd | 3022 | { |
7972aab2 | 3023 | int ret; |
78f0bacd | 3024 | |
7972aab2 DG |
3025 | assert(app); |
3026 | assert(usess); | |
88e3c2f5 | 3027 | assert(usess->active); |
7972aab2 DG |
3028 | assert(ua_sess); |
3029 | assert(ua_chan); | |
3030 | ||
3031 | /* Handle buffer type before sending the channel to the application. */ | |
3032 | switch (usess->buffer_type) { | |
3033 | case LTTNG_BUFFER_PER_UID: | |
3034 | { | |
3035 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
3036 | if (ret < 0) { | |
3037 | goto error; | |
3038 | } | |
3039 | break; | |
3040 | } | |
3041 | case LTTNG_BUFFER_PER_PID: | |
3042 | { | |
3043 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
3044 | if (ret < 0) { | |
3045 | goto error; | |
3046 | } | |
3047 | break; | |
3048 | } | |
3049 | default: | |
3050 | assert(0); | |
3051 | ret = -EINVAL; | |
78f0bacd DG |
3052 | goto error; |
3053 | } | |
3054 | ||
7972aab2 DG |
3055 | /* Initialize ust objd object using the received handle and add it. */ |
3056 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
3057 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 3058 | |
7972aab2 DG |
3059 | /* If channel is not enabled, disable it on the tracer */ |
3060 | if (!ua_chan->enabled) { | |
3061 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
3062 | if (ret < 0) { | |
3063 | goto error; | |
3064 | } | |
78f0bacd DG |
3065 | } |
3066 | ||
3067 | error: | |
3068 | return ret; | |
3069 | } | |
3070 | ||
284d8f55 | 3071 | /* |
88e3c2f5 | 3072 | * Create UST app channel and return it through ua_chanp if not NULL. |
d0b96690 | 3073 | * |
36b588ed | 3074 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 | 3075 | * |
88e3c2f5 | 3076 | * Return 0 on success or else a negative value. |
284d8f55 | 3077 | */ |
88e3c2f5 JG |
3078 | static int ust_app_channel_allocate(struct ust_app_session *ua_sess, |
3079 | struct ltt_ust_channel *uchan, | |
7972aab2 | 3080 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 3081 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
3082 | { |
3083 | int ret = 0; | |
bec39940 DG |
3084 | struct lttng_ht_iter iter; |
3085 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
3086 | struct ust_app_channel *ua_chan; |
3087 | ||
3088 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3089 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
3090 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 3091 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 3092 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 3093 | goto end; |
5b4a0ec0 DG |
3094 | } |
3095 | ||
d0b96690 | 3096 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
3097 | if (ua_chan == NULL) { |
3098 | /* Only malloc can fail here */ | |
4d710ac2 | 3099 | ret = -ENOMEM; |
88e3c2f5 | 3100 | goto error; |
fc34caaa DG |
3101 | } |
3102 | shadow_copy_channel(ua_chan, uchan); | |
3103 | ||
ffe60014 DG |
3104 | /* Set channel type. */ |
3105 | ua_chan->attr.type = type; | |
3106 | ||
d0b96690 DG |
3107 | /* Only add the channel if successful on the tracer side. */ |
3108 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
fc34caaa | 3109 | end: |
4d710ac2 DG |
3110 | if (ua_chanp) { |
3111 | *ua_chanp = ua_chan; | |
3112 | } | |
3113 | ||
3114 | /* Everything went well. */ | |
3115 | return 0; | |
5b4a0ec0 DG |
3116 | |
3117 | error: | |
4d710ac2 | 3118 | return ret; |
5b4a0ec0 DG |
3119 | } |
3120 | ||
3121 | /* | |
3122 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
3123 | * |
3124 | * Called with ust app session mutex held. | |
5b4a0ec0 | 3125 | */ |
edb67388 DG |
3126 | static |
3127 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
3128 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
3129 | struct ust_app *app) | |
284d8f55 | 3130 | { |
edb67388 | 3131 | int ret = 0; |
5b4a0ec0 | 3132 | struct ust_app_event *ua_event; |
284d8f55 | 3133 | |
edb67388 DG |
3134 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
3135 | if (ua_event == NULL) { | |
3136 | /* Only malloc can failed so something is really wrong */ | |
3137 | ret = -ENOMEM; | |
fc34caaa | 3138 | goto end; |
5b4a0ec0 | 3139 | } |
edb67388 | 3140 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 3141 | |
edb67388 | 3142 | /* Create it on the tracer side */ |
5b4a0ec0 | 3143 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 3144 | if (ret < 0) { |
e9f11505 JG |
3145 | /* |
3146 | * Not found previously means that it does not exist on the | |
3147 | * tracer. If the application reports that the event existed, | |
3148 | * it means there is a bug in the sessiond or lttng-ust | |
3149 | * (or corruption, etc.) | |
3150 | */ | |
3151 | if (ret == -LTTNG_UST_ERR_EXIST) { | |
3152 | ERR("Tracer for application reported that an event being created already existed: " | |
3153 | "event_name = \"%s\", pid = %d, ppid = %d, uid = %d, gid = %d", | |
3154 | uevent->attr.name, | |
3155 | app->pid, app->ppid, app->uid, | |
3156 | app->gid); | |
3157 | } | |
284d8f55 DG |
3158 | goto error; |
3159 | } | |
3160 | ||
d0b96690 | 3161 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 3162 | |
fc34caaa | 3163 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 3164 | app->pid); |
7f79d3a1 | 3165 | |
edb67388 | 3166 | end: |
fc34caaa DG |
3167 | return ret; |
3168 | ||
5b4a0ec0 | 3169 | error: |
fc34caaa | 3170 | /* Valid. Calling here is already in a read side lock */ |
fb45065e | 3171 | delete_ust_app_event(-1, ua_event, app); |
edb67388 | 3172 | return ret; |
5b4a0ec0 DG |
3173 | } |
3174 | ||
3175 | /* | |
3176 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 3177 | * |
7972aab2 | 3178 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
3179 | */ |
3180 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
ad7a9107 | 3181 | struct ust_app *app, struct consumer_output *consumer) |
5b4a0ec0 DG |
3182 | { |
3183 | int ret = 0; | |
ffe60014 | 3184 | struct ust_app_channel *metadata; |
d88aee68 | 3185 | struct consumer_socket *socket; |
7972aab2 | 3186 | struct ust_registry_session *registry; |
e32d7f27 | 3187 | struct ltt_session *session = NULL; |
5b4a0ec0 | 3188 | |
ffe60014 DG |
3189 | assert(ua_sess); |
3190 | assert(app); | |
d88aee68 | 3191 | assert(consumer); |
5b4a0ec0 | 3192 | |
7972aab2 | 3193 | registry = get_session_registry(ua_sess); |
fad1ed2f | 3194 | /* The UST app session is held registry shall not be null. */ |
7972aab2 DG |
3195 | assert(registry); |
3196 | ||
ce34fcd0 MD |
3197 | pthread_mutex_lock(®istry->lock); |
3198 | ||
1b532a60 DG |
3199 | /* Metadata already exists for this registry or it was closed previously */ |
3200 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
3201 | ret = 0; |
3202 | goto error; | |
5b4a0ec0 DG |
3203 | } |
3204 | ||
ffe60014 | 3205 | /* Allocate UST metadata */ |
d0b96690 | 3206 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
3207 | if (!metadata) { |
3208 | /* malloc() failed */ | |
3209 | ret = -ENOMEM; | |
3210 | goto error; | |
3211 | } | |
5b4a0ec0 | 3212 | |
ad7a9107 | 3213 | memcpy(&metadata->attr, &ua_sess->metadata_attr, sizeof(metadata->attr)); |
5b4a0ec0 | 3214 | |
7972aab2 DG |
3215 | /* Need one fd for the channel. */ |
3216 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
3217 | if (ret < 0) { | |
3218 | ERR("Exhausted number of available FD upon create metadata"); | |
3219 | goto error; | |
3220 | } | |
3221 | ||
4dc3dfc5 DG |
3222 | /* Get the right consumer socket for the application. */ |
3223 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
3224 | if (!socket) { | |
3225 | ret = -EINVAL; | |
3226 | goto error_consumer; | |
3227 | } | |
3228 | ||
331744e3 JD |
3229 | /* |
3230 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
3231 | * to the registry *before* we ask the consumer so we avoid the race of the | |
3232 | * consumer requesting the metadata and the ask_channel call on our side | |
3233 | * did not returned yet. | |
3234 | */ | |
3235 | registry->metadata_key = metadata->key; | |
3236 | ||
e098433c JG |
3237 | session = session_find_by_id(ua_sess->tracing_id); |
3238 | assert(session); | |
3239 | ||
3240 | assert(pthread_mutex_trylock(&session->lock)); | |
3241 | assert(session_trylock_list()); | |
3242 | ||
d88aee68 DG |
3243 | /* |
3244 | * Ask the metadata channel creation to the consumer. The metadata object | |
3245 | * will be created by the consumer and kept their. However, the stream is | |
3246 | * never added or monitored until we do a first push metadata to the | |
3247 | * consumer. | |
3248 | */ | |
7972aab2 | 3249 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
d2956687 | 3250 | registry, session->current_trace_chunk); |
d88aee68 | 3251 | if (ret < 0) { |
f2a444f1 DG |
3252 | /* Nullify the metadata key so we don't try to close it later on. */ |
3253 | registry->metadata_key = 0; | |
d88aee68 DG |
3254 | goto error_consumer; |
3255 | } | |
3256 | ||
3257 | /* | |
3258 | * The setup command will make the metadata stream be sent to the relayd, | |
3259 | * if applicable, and the thread managing the metadatas. This is important | |
3260 | * because after this point, if an error occurs, the only way the stream | |
3261 | * can be deleted is to be monitored in the consumer. | |
3262 | */ | |
7972aab2 | 3263 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 3264 | if (ret < 0) { |
f2a444f1 DG |
3265 | /* Nullify the metadata key so we don't try to close it later on. */ |
3266 | registry->metadata_key = 0; | |
d88aee68 | 3267 | goto error_consumer; |
5b4a0ec0 DG |
3268 | } |
3269 | ||
7972aab2 DG |
3270 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
3271 | metadata->key, app->pid); | |
5b4a0ec0 | 3272 | |
d88aee68 | 3273 | error_consumer: |
b80f0b6c | 3274 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 3275 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 3276 | error: |
ce34fcd0 | 3277 | pthread_mutex_unlock(®istry->lock); |
e32d7f27 JG |
3278 | if (session) { |
3279 | session_put(session); | |
3280 | } | |
ffe60014 | 3281 | return ret; |
5b4a0ec0 DG |
3282 | } |
3283 | ||
5b4a0ec0 | 3284 | /* |
d88aee68 DG |
3285 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
3286 | * acquired before calling this function. | |
5b4a0ec0 DG |
3287 | */ |
3288 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
3289 | { | |
d88aee68 | 3290 | struct ust_app *app = NULL; |
bec39940 DG |
3291 | struct lttng_ht_node_ulong *node; |
3292 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 3293 | |
bec39940 DG |
3294 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
3295 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
3296 | if (node == NULL) { |
3297 | DBG2("UST app no found with pid %d", pid); | |
3298 | goto error; | |
3299 | } | |
5b4a0ec0 DG |
3300 | |
3301 | DBG2("Found UST app by pid %d", pid); | |
3302 | ||
d88aee68 | 3303 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
3304 | |
3305 | error: | |
d88aee68 | 3306 | return app; |
5b4a0ec0 DG |
3307 | } |
3308 | ||
d88aee68 DG |
3309 | /* |
3310 | * Allocate and init an UST app object using the registration information and | |
3311 | * the command socket. This is called when the command socket connects to the | |
3312 | * session daemon. | |
3313 | * | |
3314 | * The object is returned on success or else NULL. | |
3315 | */ | |
d0b96690 | 3316 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 3317 | { |
d0b96690 DG |
3318 | struct ust_app *lta = NULL; |
3319 | ||
3320 | assert(msg); | |
3321 | assert(sock >= 0); | |
3322 | ||
3323 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 3324 | |
173af62f DG |
3325 | if ((msg->bits_per_long == 64 && |
3326 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
3327 | || (msg->bits_per_long == 32 && | |
3328 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 3329 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
3330 | "%d-bit long, but no consumerd for this size is available.\n", |
3331 | msg->name, msg->pid, msg->bits_per_long); | |
3332 | goto error; | |
3f2c5fcc | 3333 | } |
d0b96690 | 3334 | |
5b4a0ec0 DG |
3335 | lta = zmalloc(sizeof(struct ust_app)); |
3336 | if (lta == NULL) { | |
3337 | PERROR("malloc"); | |
d0b96690 | 3338 | goto error; |
5b4a0ec0 DG |
3339 | } |
3340 | ||
3341 | lta->ppid = msg->ppid; | |
3342 | lta->uid = msg->uid; | |
3343 | lta->gid = msg->gid; | |
d0b96690 | 3344 | |
7753dea8 | 3345 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
3346 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
3347 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
3348 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
3349 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
3350 | lta->long_alignment = msg->long_alignment; | |
3351 | lta->byte_order = msg->byte_order; | |
3352 | ||
5b4a0ec0 DG |
3353 | lta->v_major = msg->major; |
3354 | lta->v_minor = msg->minor; | |
d9bf3ca4 | 3355 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 | 3356 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
10b56aef | 3357 | lta->ust_sessions_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3358 | lta->notify_sock = -1; |
d88aee68 DG |
3359 | |
3360 | /* Copy name and make sure it's NULL terminated. */ | |
3361 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
3362 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
3363 | ||
3364 | /* | |
3365 | * Before this can be called, when receiving the registration information, | |
3366 | * the application compatibility is checked. So, at this point, the | |
3367 | * application can work with this session daemon. | |
3368 | */ | |
d0b96690 | 3369 | lta->compatible = 1; |
5b4a0ec0 | 3370 | |
852d0037 | 3371 | lta->pid = msg->pid; |
d0b96690 | 3372 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 3373 | lta->sock = sock; |
fb45065e | 3374 | pthread_mutex_init(<a->sock_lock, NULL); |
d0b96690 | 3375 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 3376 | |
d42f20df | 3377 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
d0b96690 DG |
3378 | error: |
3379 | return lta; | |
3380 | } | |
3381 | ||
d88aee68 DG |
3382 | /* |
3383 | * For a given application object, add it to every hash table. | |
3384 | */ | |
d0b96690 DG |
3385 | void ust_app_add(struct ust_app *app) |
3386 | { | |
3387 | assert(app); | |
3388 | assert(app->notify_sock >= 0); | |
3389 | ||
940c4592 JR |
3390 | app->registration_time = time(NULL); |
3391 | ||
5b4a0ec0 | 3392 | rcu_read_lock(); |
852d0037 DG |
3393 | |
3394 | /* | |
3395 | * On a re-registration, we want to kick out the previous registration of | |
3396 | * that pid | |
3397 | */ | |
d0b96690 | 3398 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
3399 | |
3400 | /* | |
3401 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
3402 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
3403 | * already in the table. | |
3404 | */ | |
d0b96690 | 3405 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 3406 | |
d0b96690 DG |
3407 | /* Add application to the notify socket hash table. */ |
3408 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
3409 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 3410 | |
d0b96690 | 3411 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
3412 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
3413 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
3414 | app->v_minor); | |
5b4a0ec0 | 3415 | |
d0b96690 DG |
3416 | rcu_read_unlock(); |
3417 | } | |
3418 | ||
d88aee68 DG |
3419 | /* |
3420 | * Set the application version into the object. | |
3421 | * | |
3422 | * Return 0 on success else a negative value either an errno code or a | |
3423 | * LTTng-UST error code. | |
3424 | */ | |
d0b96690 DG |
3425 | int ust_app_version(struct ust_app *app) |
3426 | { | |
d88aee68 DG |
3427 | int ret; |
3428 | ||
d0b96690 | 3429 | assert(app); |
d88aee68 | 3430 | |
fb45065e | 3431 | pthread_mutex_lock(&app->sock_lock); |
d88aee68 | 3432 | ret = ustctl_tracer_version(app->sock, &app->version); |
fb45065e | 3433 | pthread_mutex_unlock(&app->sock_lock); |
d88aee68 DG |
3434 | if (ret < 0) { |
3435 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
5368d366 | 3436 | ERR("UST app %d version failed with ret %d", app->sock, ret); |
d88aee68 | 3437 | } else { |
5368d366 | 3438 | DBG3("UST app %d version failed. Application is dead", app->sock); |
d88aee68 DG |
3439 | } |
3440 | } | |
3441 | ||
3442 | return ret; | |
5b4a0ec0 DG |
3443 | } |
3444 | ||
3445 | /* | |
3446 | * Unregister app by removing it from the global traceable app list and freeing | |
3447 | * the data struct. | |
3448 | * | |
3449 | * The socket is already closed at this point so no close to sock. | |
3450 | */ | |
3451 | void ust_app_unregister(int sock) | |
3452 | { | |
3453 | struct ust_app *lta; | |
bec39940 | 3454 | struct lttng_ht_node_ulong *node; |
c4b88406 | 3455 | struct lttng_ht_iter ust_app_sock_iter; |
bec39940 | 3456 | struct lttng_ht_iter iter; |
d42f20df | 3457 | struct ust_app_session *ua_sess; |
525b0740 | 3458 | int ret; |
5b4a0ec0 DG |
3459 | |
3460 | rcu_read_lock(); | |
886459c6 | 3461 | |
5b4a0ec0 | 3462 | /* Get the node reference for a call_rcu */ |
c4b88406 MD |
3463 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &ust_app_sock_iter); |
3464 | node = lttng_ht_iter_get_node_ulong(&ust_app_sock_iter); | |
d0b96690 | 3465 | assert(node); |
284d8f55 | 3466 | |
852d0037 | 3467 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
3468 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
3469 | ||
d88aee68 | 3470 | /* |
ce34fcd0 MD |
3471 | * For per-PID buffers, perform "push metadata" and flush all |
3472 | * application streams before removing app from hash tables, | |
3473 | * ensuring proper behavior of data_pending check. | |
c4b88406 | 3474 | * Remove sessions so they are not visible during deletion. |
d88aee68 | 3475 | */ |
d42f20df DG |
3476 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, |
3477 | node.node) { | |
7972aab2 DG |
3478 | struct ust_registry_session *registry; |
3479 | ||
d42f20df DG |
3480 | ret = lttng_ht_del(lta->sessions, &iter); |
3481 | if (ret) { | |
3482 | /* The session was already removed so scheduled for teardown. */ | |
3483 | continue; | |
3484 | } | |
3485 | ||
ce34fcd0 MD |
3486 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { |
3487 | (void) ust_app_flush_app_session(lta, ua_sess); | |
3488 | } | |
c4b88406 | 3489 | |
d42f20df DG |
3490 | /* |
3491 | * Add session to list for teardown. This is safe since at this point we | |
3492 | * are the only one using this list. | |
3493 | */ | |
d88aee68 DG |
3494 | pthread_mutex_lock(&ua_sess->lock); |
3495 | ||
b161602a MD |
3496 | if (ua_sess->deleted) { |
3497 | pthread_mutex_unlock(&ua_sess->lock); | |
3498 | continue; | |
3499 | } | |
3500 | ||
d88aee68 DG |
3501 | /* |
3502 | * Normally, this is done in the delete session process which is | |
3503 | * executed in the call rcu below. However, upon registration we can't | |
3504 | * afford to wait for the grace period before pushing data or else the | |
3505 | * data pending feature can race between the unregistration and stop | |
3506 | * command where the data pending command is sent *before* the grace | |
3507 | * period ended. | |
3508 | * | |
3509 | * The close metadata below nullifies the metadata pointer in the | |
3510 | * session so the delete session will NOT push/close a second time. | |
3511 | */ | |
7972aab2 | 3512 | registry = get_session_registry(ua_sess); |
ce34fcd0 | 3513 | if (registry) { |
7972aab2 DG |
3514 | /* Push metadata for application before freeing the application. */ |
3515 | (void) push_metadata(registry, ua_sess->consumer); | |
3516 | ||
3517 | /* | |
3518 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
3519 | * metadata only on destroy trace session in this case. Also, the |
3520 | * previous push metadata could have flag the metadata registry to | |
3521 | * close so don't send a close command if closed. | |
7972aab2 | 3522 | */ |
ce34fcd0 | 3523 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
3524 | /* And ask to close it for this session registry. */ |
3525 | (void) close_metadata(registry, ua_sess->consumer); | |
3526 | } | |
3527 | } | |
d42f20df | 3528 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
c4b88406 | 3529 | |
d88aee68 | 3530 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
3531 | } |
3532 | ||
c4b88406 MD |
3533 | /* Remove application from PID hash table */ |
3534 | ret = lttng_ht_del(ust_app_ht_by_sock, &ust_app_sock_iter); | |
3535 | assert(!ret); | |
3536 | ||
3537 | /* | |
3538 | * Remove application from notify hash table. The thread handling the | |
3539 | * notify socket could have deleted the node so ignore on error because | |
c48239ca JG |
3540 | * either way it's valid. The close of that socket is handled by the |
3541 | * apps_notify_thread. | |
c4b88406 MD |
3542 | */ |
3543 | iter.iter.node = <a->notify_sock_n.node; | |
3544 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3545 | ||
3546 | /* | |
3547 | * Ignore return value since the node might have been removed before by an | |
3548 | * add replace during app registration because the PID can be reassigned by | |
3549 | * the OS. | |
3550 | */ | |
3551 | iter.iter.node = <a->pid_n.node; | |
3552 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3553 | if (ret) { | |
3554 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
3555 | lta->pid); | |
3556 | } | |
3557 | ||
852d0037 DG |
3558 | /* Free memory */ |
3559 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
3560 | ||
5b4a0ec0 DG |
3561 | rcu_read_unlock(); |
3562 | return; | |
284d8f55 DG |
3563 | } |
3564 | ||
5b4a0ec0 DG |
3565 | /* |
3566 | * Fill events array with all events name of all registered apps. | |
3567 | */ | |
3568 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 3569 | { |
5b4a0ec0 DG |
3570 | int ret, handle; |
3571 | size_t nbmem, count = 0; | |
bec39940 | 3572 | struct lttng_ht_iter iter; |
5b4a0ec0 | 3573 | struct ust_app *app; |
c617c0c6 | 3574 | struct lttng_event *tmp_event; |
421cb601 | 3575 | |
5b4a0ec0 | 3576 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
3577 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
3578 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
3579 | PERROR("zmalloc ust app events"); |
3580 | ret = -ENOMEM; | |
421cb601 DG |
3581 | goto error; |
3582 | } | |
3583 | ||
5b4a0ec0 | 3584 | rcu_read_lock(); |
421cb601 | 3585 | |
852d0037 | 3586 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 3587 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 3588 | |
840cb59c | 3589 | health_code_update(); |
86acf0da | 3590 | |
e0c7ec2b DG |
3591 | if (!app->compatible) { |
3592 | /* | |
3593 | * TODO: In time, we should notice the caller of this error by | |
3594 | * telling him that this is a version error. | |
3595 | */ | |
3596 | continue; | |
3597 | } | |
fb45065e | 3598 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 3599 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 3600 | if (handle < 0) { |
ffe60014 DG |
3601 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3602 | ERR("UST app list events getting handle failed for app pid %d", | |
3603 | app->pid); | |
3604 | } | |
fb45065e | 3605 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 DG |
3606 | continue; |
3607 | } | |
421cb601 | 3608 | |
852d0037 | 3609 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 3610 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3611 | /* Handle ustctl error. */ |
3612 | if (ret < 0) { | |
fb45065e MD |
3613 | int release_ret; |
3614 | ||
a2ba1ab0 | 3615 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3616 | ERR("UST app tp list get failed for app %d with ret %d", |
3617 | app->sock, ret); | |
3618 | } else { | |
3619 | DBG3("UST app tp list get failed. Application is dead"); | |
3757b385 DG |
3620 | /* |
3621 | * This is normal behavior, an application can die during the | |
3622 | * creation process. Don't report an error so the execution can | |
3623 | * continue normally. Continue normal execution. | |
3624 | */ | |
3625 | break; | |
ffe60014 | 3626 | } |
98f595d4 | 3627 | free(tmp_event); |
fb45065e | 3628 | release_ret = ustctl_release_handle(app->sock, handle); |
68313703 JG |
3629 | if (release_ret < 0 && |
3630 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3631 | release_ret != -EPIPE) { | |
fb45065e MD |
3632 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3633 | } | |
3634 | pthread_mutex_unlock(&app->sock_lock); | |
ffe60014 DG |
3635 | goto rcu_error; |
3636 | } | |
3637 | ||
840cb59c | 3638 | health_code_update(); |
815564d8 | 3639 | if (count >= nbmem) { |
d7b3776f | 3640 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3641 | struct lttng_event *new_tmp_event; |
3642 | size_t new_nbmem; | |
3643 | ||
3644 | new_nbmem = nbmem << 1; | |
3645 | DBG2("Reallocating event list from %zu to %zu entries", | |
3646 | nbmem, new_nbmem); | |
3647 | new_tmp_event = realloc(tmp_event, | |
3648 | new_nbmem * sizeof(struct lttng_event)); | |
3649 | if (new_tmp_event == NULL) { | |
fb45065e MD |
3650 | int release_ret; |
3651 | ||
5b4a0ec0 | 3652 | PERROR("realloc ust app events"); |
c617c0c6 | 3653 | free(tmp_event); |
5b4a0ec0 | 3654 | ret = -ENOMEM; |
fb45065e | 3655 | release_ret = ustctl_release_handle(app->sock, handle); |
68313703 JG |
3656 | if (release_ret < 0 && |
3657 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3658 | release_ret != -EPIPE) { | |
fb45065e MD |
3659 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3660 | } | |
3661 | pthread_mutex_unlock(&app->sock_lock); | |
5b4a0ec0 DG |
3662 | goto rcu_error; |
3663 | } | |
53efb85a MD |
3664 | /* Zero the new memory */ |
3665 | memset(new_tmp_event + nbmem, 0, | |
3666 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
3667 | nbmem = new_nbmem; | |
3668 | tmp_event = new_tmp_event; | |
5b4a0ec0 | 3669 | } |
c617c0c6 MD |
3670 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
3671 | tmp_event[count].loglevel = uiter.loglevel; | |
3672 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
3673 | tmp_event[count].pid = app->pid; | |
3674 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 3675 | count++; |
421cb601 | 3676 | } |
fb45065e MD |
3677 | ret = ustctl_release_handle(app->sock, handle); |
3678 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 | 3679 | if (ret < 0 && ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
fb45065e MD |
3680 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
3681 | } | |
421cb601 DG |
3682 | } |
3683 | ||
5b4a0ec0 | 3684 | ret = count; |
c617c0c6 | 3685 | *events = tmp_event; |
421cb601 | 3686 | |
5b4a0ec0 | 3687 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 3688 | |
5b4a0ec0 DG |
3689 | rcu_error: |
3690 | rcu_read_unlock(); | |
421cb601 | 3691 | error: |
840cb59c | 3692 | health_code_update(); |
5b4a0ec0 | 3693 | return ret; |
421cb601 DG |
3694 | } |
3695 | ||
f37d259d MD |
3696 | /* |
3697 | * Fill events array with all events name of all registered apps. | |
3698 | */ | |
3699 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
3700 | { | |
3701 | int ret, handle; | |
3702 | size_t nbmem, count = 0; | |
3703 | struct lttng_ht_iter iter; | |
3704 | struct ust_app *app; | |
c617c0c6 | 3705 | struct lttng_event_field *tmp_event; |
f37d259d MD |
3706 | |
3707 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
3708 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
3709 | if (tmp_event == NULL) { | |
f37d259d MD |
3710 | PERROR("zmalloc ust app event fields"); |
3711 | ret = -ENOMEM; | |
3712 | goto error; | |
3713 | } | |
3714 | ||
3715 | rcu_read_lock(); | |
3716 | ||
3717 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3718 | struct lttng_ust_field_iter uiter; | |
3719 | ||
840cb59c | 3720 | health_code_update(); |
86acf0da | 3721 | |
f37d259d MD |
3722 | if (!app->compatible) { |
3723 | /* | |
3724 | * TODO: In time, we should notice the caller of this error by | |
3725 | * telling him that this is a version error. | |
3726 | */ | |
3727 | continue; | |
3728 | } | |
fb45065e | 3729 | pthread_mutex_lock(&app->sock_lock); |
f37d259d MD |
3730 | handle = ustctl_tracepoint_field_list(app->sock); |
3731 | if (handle < 0) { | |
ffe60014 DG |
3732 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3733 | ERR("UST app list field getting handle failed for app pid %d", | |
3734 | app->pid); | |
3735 | } | |
fb45065e | 3736 | pthread_mutex_unlock(&app->sock_lock); |
f37d259d MD |
3737 | continue; |
3738 | } | |
3739 | ||
3740 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 3741 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3742 | /* Handle ustctl error. */ |
3743 | if (ret < 0) { | |
fb45065e MD |
3744 | int release_ret; |
3745 | ||
a2ba1ab0 | 3746 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3747 | ERR("UST app tp list field failed for app %d with ret %d", |
3748 | app->sock, ret); | |
3749 | } else { | |
3750 | DBG3("UST app tp list field failed. Application is dead"); | |
3757b385 DG |
3751 | /* |
3752 | * This is normal behavior, an application can die during the | |
3753 | * creation process. Don't report an error so the execution can | |
98f595d4 | 3754 | * continue normally. Reset list and count for next app. |
3757b385 DG |
3755 | */ |
3756 | break; | |
ffe60014 | 3757 | } |
98f595d4 | 3758 | free(tmp_event); |
fb45065e MD |
3759 | release_ret = ustctl_release_handle(app->sock, handle); |
3760 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
3761 | if (release_ret < 0 && |
3762 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3763 | release_ret != -EPIPE) { | |
fb45065e MD |
3764 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3765 | } | |
ffe60014 DG |
3766 | goto rcu_error; |
3767 | } | |
3768 | ||
840cb59c | 3769 | health_code_update(); |
f37d259d | 3770 | if (count >= nbmem) { |
d7b3776f | 3771 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3772 | struct lttng_event_field *new_tmp_event; |
3773 | size_t new_nbmem; | |
3774 | ||
3775 | new_nbmem = nbmem << 1; | |
3776 | DBG2("Reallocating event field list from %zu to %zu entries", | |
3777 | nbmem, new_nbmem); | |
3778 | new_tmp_event = realloc(tmp_event, | |
3779 | new_nbmem * sizeof(struct lttng_event_field)); | |
3780 | if (new_tmp_event == NULL) { | |
fb45065e MD |
3781 | int release_ret; |
3782 | ||
f37d259d | 3783 | PERROR("realloc ust app event fields"); |
c617c0c6 | 3784 | free(tmp_event); |
f37d259d | 3785 | ret = -ENOMEM; |
fb45065e MD |
3786 | release_ret = ustctl_release_handle(app->sock, handle); |
3787 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
3788 | if (release_ret && |
3789 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3790 | release_ret != -EPIPE) { | |
fb45065e MD |
3791 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3792 | } | |
f37d259d MD |
3793 | goto rcu_error; |
3794 | } | |
53efb85a MD |
3795 | /* Zero the new memory */ |
3796 | memset(new_tmp_event + nbmem, 0, | |
3797 | (new_nbmem - nbmem) * sizeof(struct lttng_event_field)); | |
3798 | nbmem = new_nbmem; | |
3799 | tmp_event = new_tmp_event; | |
f37d259d | 3800 | } |
f37d259d | 3801 | |
c617c0c6 | 3802 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
2e84128e DG |
3803 | /* Mapping between these enums matches 1 to 1. */ |
3804 | tmp_event[count].type = (enum lttng_event_field_type) uiter.type; | |
c617c0c6 | 3805 | tmp_event[count].nowrite = uiter.nowrite; |
f37d259d | 3806 | |
c617c0c6 MD |
3807 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
3808 | tmp_event[count].event.loglevel = uiter.loglevel; | |
2e84128e | 3809 | tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; |
c617c0c6 MD |
3810 | tmp_event[count].event.pid = app->pid; |
3811 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
3812 | count++; |
3813 | } | |
fb45065e MD |
3814 | ret = ustctl_release_handle(app->sock, handle); |
3815 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
3816 | if (ret < 0 && |
3817 | ret != -LTTNG_UST_ERR_EXITING && | |
3818 | ret != -EPIPE) { | |
fb45065e MD |
3819 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
3820 | } | |
f37d259d MD |
3821 | } |
3822 | ||
3823 | ret = count; | |
c617c0c6 | 3824 | *fields = tmp_event; |
f37d259d MD |
3825 | |
3826 | DBG2("UST app list event fields done (%zu events)", count); | |
3827 | ||
3828 | rcu_error: | |
3829 | rcu_read_unlock(); | |
3830 | error: | |
840cb59c | 3831 | health_code_update(); |
f37d259d MD |
3832 | return ret; |
3833 | } | |
3834 | ||
5b4a0ec0 DG |
3835 | /* |
3836 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
3837 | * |
3838 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
3839 | */ |
3840 | void ust_app_clean_list(void) | |
421cb601 | 3841 | { |
5b4a0ec0 | 3842 | int ret; |
659ed79f | 3843 | struct ust_app *app; |
bec39940 | 3844 | struct lttng_ht_iter iter; |
421cb601 | 3845 | |
5b4a0ec0 | 3846 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3847 | |
5b4a0ec0 | 3848 | rcu_read_lock(); |
421cb601 | 3849 | |
faadaa3a JG |
3850 | /* Cleanup notify socket hash table */ |
3851 | if (ust_app_ht_by_notify_sock) { | |
3852 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3853 | notify_sock_n.node) { | |
3854 | struct cds_lfht_node *node; | |
3855 | struct ust_app *app; | |
3856 | ||
3857 | node = cds_lfht_iter_get_node(&iter.iter); | |
3858 | if (!node) { | |
3859 | continue; | |
3860 | } | |
3861 | ||
3862 | app = container_of(node, struct ust_app, | |
3863 | notify_sock_n.node); | |
3864 | ust_app_notify_sock_unregister(app->notify_sock); | |
3865 | } | |
3866 | } | |
3867 | ||
f1b711c4 MD |
3868 | if (ust_app_ht) { |
3869 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3870 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3871 | assert(!ret); | |
3872 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
3873 | } | |
421cb601 DG |
3874 | } |
3875 | ||
852d0037 | 3876 | /* Cleanup socket hash table */ |
f1b711c4 MD |
3877 | if (ust_app_ht_by_sock) { |
3878 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, | |
3879 | sock_n.node) { | |
3880 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); | |
3881 | assert(!ret); | |
3882 | } | |
bec39940 | 3883 | } |
852d0037 | 3884 | |
36b588ed | 3885 | rcu_read_unlock(); |
d88aee68 | 3886 | |
bec39940 | 3887 | /* Destroy is done only when the ht is empty */ |
f1b711c4 MD |
3888 | if (ust_app_ht) { |
3889 | ht_cleanup_push(ust_app_ht); | |
3890 | } | |
3891 | if (ust_app_ht_by_sock) { | |
3892 | ht_cleanup_push(ust_app_ht_by_sock); | |
3893 | } | |
3894 | if (ust_app_ht_by_notify_sock) { | |
3895 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
3896 | } | |
5b4a0ec0 DG |
3897 | } |
3898 | ||
3899 | /* | |
3900 | * Init UST app hash table. | |
3901 | */ | |
57703f6e | 3902 | int ust_app_ht_alloc(void) |
5b4a0ec0 | 3903 | { |
bec39940 | 3904 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3905 | if (!ust_app_ht) { |
3906 | return -1; | |
3907 | } | |
852d0037 | 3908 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3909 | if (!ust_app_ht_by_sock) { |
3910 | return -1; | |
3911 | } | |
d0b96690 | 3912 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3913 | if (!ust_app_ht_by_notify_sock) { |
3914 | return -1; | |
3915 | } | |
3916 | return 0; | |
421cb601 DG |
3917 | } |
3918 | ||
78f0bacd DG |
3919 | /* |
3920 | * For a specific UST session, disable the channel for all registered apps. | |
3921 | */ | |
35a9059d | 3922 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3923 | struct ltt_ust_channel *uchan) |
3924 | { | |
3925 | int ret = 0; | |
bec39940 DG |
3926 | struct lttng_ht_iter iter; |
3927 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3928 | struct ust_app *app; |
3929 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3930 | struct ust_app_channel *ua_chan; |
78f0bacd | 3931 | |
88e3c2f5 | 3932 | assert(usess->active); |
d9bf3ca4 | 3933 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 3934 | uchan->name, usess->id); |
78f0bacd DG |
3935 | |
3936 | rcu_read_lock(); | |
3937 | ||
3938 | /* For every registered applications */ | |
852d0037 | 3939 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3940 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3941 | if (!app->compatible) { |
3942 | /* | |
3943 | * TODO: In time, we should notice the caller of this error by | |
3944 | * telling him that this is a version error. | |
3945 | */ | |
3946 | continue; | |
3947 | } | |
78f0bacd DG |
3948 | ua_sess = lookup_session_by_app(usess, app); |
3949 | if (ua_sess == NULL) { | |
3950 | continue; | |
3951 | } | |
3952 | ||
8535a6d9 | 3953 | /* Get channel */ |
bec39940 DG |
3954 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3955 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
3956 | /* If the session if found for the app, the channel must be there */ |
3957 | assert(ua_chan_node); | |
3958 | ||
3959 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3960 | /* The channel must not be already disabled */ | |
3961 | assert(ua_chan->enabled == 1); | |
3962 | ||
3963 | /* Disable channel onto application */ | |
3964 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
3965 | if (ret < 0) { |
3966 | /* XXX: We might want to report this error at some point... */ | |
3967 | continue; | |
3968 | } | |
3969 | } | |
3970 | ||
3971 | rcu_read_unlock(); | |
78f0bacd DG |
3972 | return ret; |
3973 | } | |
3974 | ||
3975 | /* | |
3976 | * For a specific UST session, enable the channel for all registered apps. | |
3977 | */ | |
35a9059d | 3978 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3979 | struct ltt_ust_channel *uchan) |
3980 | { | |
3981 | int ret = 0; | |
bec39940 | 3982 | struct lttng_ht_iter iter; |
78f0bacd DG |
3983 | struct ust_app *app; |
3984 | struct ust_app_session *ua_sess; | |
3985 | ||
88e3c2f5 | 3986 | assert(usess->active); |
d9bf3ca4 | 3987 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 3988 | uchan->name, usess->id); |
78f0bacd DG |
3989 | |
3990 | rcu_read_lock(); | |
3991 | ||
3992 | /* For every registered applications */ | |
852d0037 | 3993 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3994 | if (!app->compatible) { |
3995 | /* | |
3996 | * TODO: In time, we should notice the caller of this error by | |
3997 | * telling him that this is a version error. | |
3998 | */ | |
3999 | continue; | |
4000 | } | |
78f0bacd DG |
4001 | ua_sess = lookup_session_by_app(usess, app); |
4002 | if (ua_sess == NULL) { | |
4003 | continue; | |
4004 | } | |
4005 | ||
4006 | /* Enable channel onto application */ | |
4007 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
4008 | if (ret < 0) { | |
4009 | /* XXX: We might want to report this error at some point... */ | |
4010 | continue; | |
4011 | } | |
4012 | } | |
4013 | ||
4014 | rcu_read_unlock(); | |
78f0bacd DG |
4015 | return ret; |
4016 | } | |
4017 | ||
b0a40d28 DG |
4018 | /* |
4019 | * Disable an event in a channel and for a specific session. | |
4020 | */ | |
35a9059d DG |
4021 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
4022 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
4023 | { |
4024 | int ret = 0; | |
bec39940 | 4025 | struct lttng_ht_iter iter, uiter; |
700c5a9d | 4026 | struct lttng_ht_node_str *ua_chan_node; |
b0a40d28 DG |
4027 | struct ust_app *app; |
4028 | struct ust_app_session *ua_sess; | |
4029 | struct ust_app_channel *ua_chan; | |
4030 | struct ust_app_event *ua_event; | |
4031 | ||
88e3c2f5 | 4032 | assert(usess->active); |
b0a40d28 | 4033 | DBG("UST app disabling event %s for all apps in channel " |
d9bf3ca4 MD |
4034 | "%s for session id %" PRIu64, |
4035 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
4036 | |
4037 | rcu_read_lock(); | |
4038 | ||
4039 | /* For all registered applications */ | |
852d0037 | 4040 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4041 | if (!app->compatible) { |
4042 | /* | |
4043 | * TODO: In time, we should notice the caller of this error by | |
4044 | * telling him that this is a version error. | |
4045 | */ | |
4046 | continue; | |
4047 | } | |
b0a40d28 DG |
4048 | ua_sess = lookup_session_by_app(usess, app); |
4049 | if (ua_sess == NULL) { | |
4050 | /* Next app */ | |
4051 | continue; | |
4052 | } | |
4053 | ||
4054 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
4055 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4056 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 4057 | if (ua_chan_node == NULL) { |
d9bf3ca4 | 4058 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 4059 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
4060 | continue; |
4061 | } | |
4062 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4063 | ||
700c5a9d JR |
4064 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
4065 | uevent->filter, uevent->attr.loglevel, | |
4066 | uevent->exclusion); | |
4067 | if (ua_event == NULL) { | |
b0a40d28 | 4068 | DBG2("Event %s not found in channel %s for app pid %d." |
852d0037 | 4069 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
4070 | continue; |
4071 | } | |
b0a40d28 | 4072 | |
7f79d3a1 | 4073 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
4074 | if (ret < 0) { |
4075 | /* XXX: Report error someday... */ | |
4076 | continue; | |
4077 | } | |
4078 | } | |
4079 | ||
4080 | rcu_read_unlock(); | |
88e3c2f5 JG |
4081 | return ret; |
4082 | } | |
4083 | ||
4084 | /* The ua_sess lock must be held by the caller. */ | |
4085 | static | |
4086 | int ust_app_channel_create(struct ltt_ust_session *usess, | |
4087 | struct ust_app_session *ua_sess, | |
4088 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
4089 | struct ust_app_channel **_ua_chan) | |
4090 | { | |
4091 | int ret = 0; | |
4092 | struct ust_app_channel *ua_chan = NULL; | |
4093 | ||
4094 | assert(ua_sess); | |
4095 | ASSERT_LOCKED(ua_sess->lock); | |
4096 | ||
4097 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, | |
4098 | sizeof(uchan->name))) { | |
4099 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, | |
4100 | &uchan->attr); | |
4101 | ret = 0; | |
4102 | } else { | |
4103 | struct ltt_ust_context *uctx = NULL; | |
4104 | ||
4105 | /* | |
4106 | * Create channel onto application and synchronize its | |
4107 | * configuration. | |
4108 | */ | |
4109 | ret = ust_app_channel_allocate(ua_sess, uchan, | |
4110 | LTTNG_UST_CHAN_PER_CPU, usess, | |
4111 | &ua_chan); | |
4112 | if (ret == 0) { | |
4113 | ret = ust_app_channel_send(app, usess, | |
4114 | ua_sess, ua_chan); | |
4115 | } else { | |
4116 | goto end; | |
4117 | } | |
4118 | ||
4119 | /* Add contexts. */ | |
4120 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { | |
4121 | ret = create_ust_app_channel_context(ua_chan, | |
4122 | &uctx->ctx, app); | |
4123 | if (ret) { | |
4124 | goto end; | |
4125 | } | |
4126 | } | |
4127 | } | |
4128 | if (ret < 0) { | |
4129 | switch (ret) { | |
4130 | case -ENOTCONN: | |
4131 | /* | |
4132 | * The application's socket is not valid. Either a bad socket | |
4133 | * or a timeout on it. We can't inform the caller that for a | |
4134 | * specific app, the session failed so lets continue here. | |
4135 | */ | |
4136 | ret = 0; /* Not an error. */ | |
4137 | break; | |
4138 | case -ENOMEM: | |
4139 | default: | |
4140 | break; | |
4141 | } | |
4142 | } | |
0498a00c | 4143 | end: |
88e3c2f5 JG |
4144 | if (ret == 0 && _ua_chan) { |
4145 | /* | |
4146 | * Only return the application's channel on success. Note | |
4147 | * that the channel can still be part of the application's | |
4148 | * channel hashtable on error. | |
4149 | */ | |
4150 | *_ua_chan = ua_chan; | |
4151 | } | |
b0a40d28 DG |
4152 | return ret; |
4153 | } | |
4154 | ||
421cb601 | 4155 | /* |
5b4a0ec0 | 4156 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 4157 | */ |
35a9059d | 4158 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
4159 | struct ltt_ust_channel *uchan) |
4160 | { | |
88e3c2f5 JG |
4161 | int ret = 0; |
4162 | struct cds_lfht_iter iter; | |
48842b30 | 4163 | struct ust_app *app; |
48842b30 | 4164 | |
fc34caaa | 4165 | assert(usess); |
88e3c2f5 | 4166 | assert(usess->active); |
fc34caaa | 4167 | assert(uchan); |
421cb601 | 4168 | |
d9bf3ca4 | 4169 | DBG2("UST app adding channel %s to UST domain for session id %" PRIu64, |
a991f516 | 4170 | uchan->name, usess->id); |
48842b30 DG |
4171 | |
4172 | rcu_read_lock(); | |
5b4a0ec0 | 4173 | /* For every registered applications */ |
88e3c2f5 JG |
4174 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter, app, pid_n.node) { |
4175 | struct ust_app_session *ua_sess; | |
4176 | int session_was_created = 0; | |
4177 | ||
4178 | if (!app->compatible || | |
4179 | !trace_ust_pid_tracker_lookup(usess, app->pid)) { | |
4180 | goto error_rcu_unlock; | |
a9ad0c8f MD |
4181 | } |
4182 | ||
edb67388 DG |
4183 | /* |
4184 | * Create session on the tracer side and add it to app session HT. Note | |
4185 | * that if session exist, it will simply return a pointer to the ust | |
4186 | * app session. | |
4187 | */ | |
88e3c2f5 JG |
4188 | ret = find_or_create_ust_app_session(usess, app, &ua_sess, |
4189 | &session_was_created); | |
3d8ca23b DG |
4190 | if (ret < 0) { |
4191 | switch (ret) { | |
4192 | case -ENOTCONN: | |
4193 | /* | |
88e3c2f5 JG |
4194 | * The application's socket is not valid. Either a bad |
4195 | * socket or a timeout on it. We can't inform the caller | |
4196 | * that for a specific app, the session failed so lets | |
4197 | * continue here; it is not an error. | |
3d8ca23b | 4198 | */ |
88e3c2f5 JG |
4199 | ret = 0; |
4200 | goto error_rcu_unlock; | |
3d8ca23b DG |
4201 | case -ENOMEM: |
4202 | default: | |
4203 | goto error_rcu_unlock; | |
4204 | } | |
48842b30 | 4205 | } |
b161602a MD |
4206 | |
4207 | if (ua_sess->deleted) { | |
b161602a MD |
4208 | continue; |
4209 | } | |
88e3c2f5 JG |
4210 | ret = ust_app_channel_create(usess, ua_sess, uchan, app, NULL); |
4211 | if (ret) { | |
4212 | if (session_was_created) { | |
d0b96690 | 4213 | destroy_app_session(app, ua_sess); |
3d8ca23b | 4214 | } |
88e3c2f5 | 4215 | goto error_rcu_unlock; |
48842b30 | 4216 | } |
48842b30 | 4217 | } |
5b4a0ec0 | 4218 | |
95e047ff | 4219 | error_rcu_unlock: |
48842b30 | 4220 | rcu_read_unlock(); |
3c14c33f | 4221 | return ret; |
48842b30 DG |
4222 | } |
4223 | ||
5b4a0ec0 | 4224 | /* |
edb67388 | 4225 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 4226 | */ |
35a9059d | 4227 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
4228 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4229 | { | |
4230 | int ret = 0; | |
bec39940 | 4231 | struct lttng_ht_iter iter, uiter; |
18eace3b | 4232 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
4233 | struct ust_app *app; |
4234 | struct ust_app_session *ua_sess; | |
4235 | struct ust_app_channel *ua_chan; | |
4236 | struct ust_app_event *ua_event; | |
48842b30 | 4237 | |
88e3c2f5 | 4238 | assert(usess->active); |
d9bf3ca4 | 4239 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 4240 | uevent->attr.name, usess->id); |
48842b30 | 4241 | |
edb67388 DG |
4242 | /* |
4243 | * NOTE: At this point, this function is called only if the session and | |
4244 | * channel passed are already created for all apps. and enabled on the | |
4245 | * tracer also. | |
4246 | */ | |
4247 | ||
48842b30 | 4248 | rcu_read_lock(); |
421cb601 DG |
4249 | |
4250 | /* For all registered applications */ | |
852d0037 | 4251 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4252 | if (!app->compatible) { |
4253 | /* | |
4254 | * TODO: In time, we should notice the caller of this error by | |
4255 | * telling him that this is a version error. | |
4256 | */ | |
4257 | continue; | |
4258 | } | |
edb67388 | 4259 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4260 | if (!ua_sess) { |
4261 | /* The application has problem or is probably dead. */ | |
4262 | continue; | |
4263 | } | |
ba767faf | 4264 | |
d0b96690 DG |
4265 | pthread_mutex_lock(&ua_sess->lock); |
4266 | ||
b161602a MD |
4267 | if (ua_sess->deleted) { |
4268 | pthread_mutex_unlock(&ua_sess->lock); | |
4269 | continue; | |
4270 | } | |
4271 | ||
edb67388 | 4272 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4273 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4274 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
a7169585 MD |
4275 | /* |
4276 | * It is possible that the channel cannot be found is | |
4277 | * the channel/event creation occurs concurrently with | |
4278 | * an application exit. | |
4279 | */ | |
4280 | if (!ua_chan_node) { | |
4281 | pthread_mutex_unlock(&ua_sess->lock); | |
4282 | continue; | |
4283 | } | |
edb67388 DG |
4284 | |
4285 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4286 | ||
18eace3b DG |
4287 | /* Get event node */ |
4288 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
39c5a3a7 | 4289 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 4290 | if (ua_event == NULL) { |
7f79d3a1 | 4291 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 4292 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 4293 | goto next_app; |
35a9059d | 4294 | } |
35a9059d DG |
4295 | |
4296 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
4297 | if (ret < 0) { | |
d0b96690 | 4298 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 4299 | goto error; |
48842b30 | 4300 | } |
d0b96690 DG |
4301 | next_app: |
4302 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
4303 | } |
4304 | ||
7f79d3a1 | 4305 | error: |
edb67388 | 4306 | rcu_read_unlock(); |
edb67388 DG |
4307 | return ret; |
4308 | } | |
4309 | ||
4310 | /* | |
4311 | * For a specific existing UST session and UST channel, creates the event for | |
4312 | * all registered apps. | |
4313 | */ | |
35a9059d | 4314 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
4315 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4316 | { | |
4317 | int ret = 0; | |
bec39940 DG |
4318 | struct lttng_ht_iter iter, uiter; |
4319 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
4320 | struct ust_app *app; |
4321 | struct ust_app_session *ua_sess; | |
4322 | struct ust_app_channel *ua_chan; | |
4323 | ||
88e3c2f5 | 4324 | assert(usess->active); |
d9bf3ca4 | 4325 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 4326 | uevent->attr.name, usess->id); |
edb67388 | 4327 | |
edb67388 DG |
4328 | rcu_read_lock(); |
4329 | ||
4330 | /* For all registered applications */ | |
852d0037 | 4331 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4332 | if (!app->compatible) { |
4333 | /* | |
4334 | * TODO: In time, we should notice the caller of this error by | |
4335 | * telling him that this is a version error. | |
4336 | */ | |
4337 | continue; | |
4338 | } | |
edb67388 | 4339 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4340 | if (!ua_sess) { |
4341 | /* The application has problem or is probably dead. */ | |
4342 | continue; | |
4343 | } | |
48842b30 | 4344 | |
d0b96690 | 4345 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
4346 | |
4347 | if (ua_sess->deleted) { | |
4348 | pthread_mutex_unlock(&ua_sess->lock); | |
4349 | continue; | |
4350 | } | |
4351 | ||
48842b30 | 4352 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4353 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4354 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
4355 | /* If the channel is not found, there is a code flow error */ |
4356 | assert(ua_chan_node); | |
4357 | ||
48842b30 DG |
4358 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
4359 | ||
edb67388 | 4360 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 4361 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 4362 | if (ret < 0) { |
49c336c1 | 4363 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
4364 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
4365 | break; | |
4366 | } | |
4367 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 4368 | uevent->attr.name, app->pid); |
5b4a0ec0 | 4369 | continue; |
48842b30 | 4370 | } |
48842b30 | 4371 | } |
5b4a0ec0 | 4372 | |
48842b30 | 4373 | rcu_read_unlock(); |
48842b30 DG |
4374 | return ret; |
4375 | } | |
4376 | ||
5b4a0ec0 DG |
4377 | /* |
4378 | * Start tracing for a specific UST session and app. | |
fad1ed2f JR |
4379 | * |
4380 | * Called with UST app session lock held. | |
4381 | * | |
5b4a0ec0 | 4382 | */ |
b34cbebf | 4383 | static |
421cb601 | 4384 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
4385 | { |
4386 | int ret = 0; | |
48842b30 | 4387 | struct ust_app_session *ua_sess; |
48842b30 | 4388 | |
852d0037 | 4389 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 4390 | |
509cbaf8 MD |
4391 | rcu_read_lock(); |
4392 | ||
e0c7ec2b DG |
4393 | if (!app->compatible) { |
4394 | goto end; | |
4395 | } | |
4396 | ||
421cb601 DG |
4397 | ua_sess = lookup_session_by_app(usess, app); |
4398 | if (ua_sess == NULL) { | |
d42f20df DG |
4399 | /* The session is in teardown process. Ignore and continue. */ |
4400 | goto end; | |
421cb601 | 4401 | } |
48842b30 | 4402 | |
d0b96690 DG |
4403 | pthread_mutex_lock(&ua_sess->lock); |
4404 | ||
b161602a MD |
4405 | if (ua_sess->deleted) { |
4406 | pthread_mutex_unlock(&ua_sess->lock); | |
4407 | goto end; | |
4408 | } | |
4409 | ||
aea829b3 DG |
4410 | /* Upon restart, we skip the setup, already done */ |
4411 | if (ua_sess->started) { | |
8be98f9a | 4412 | goto skip_setup; |
aea829b3 | 4413 | } |
8be98f9a | 4414 | |
d65d2de8 DG |
4415 | /* |
4416 | * Create the metadata for the application. This returns gracefully if a | |
4417 | * metadata was already set for the session. | |
4418 | */ | |
ad7a9107 | 4419 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer); |
421cb601 | 4420 | if (ret < 0) { |
d0b96690 | 4421 | goto error_unlock; |
421cb601 | 4422 | } |
48842b30 | 4423 | |
840cb59c | 4424 | health_code_update(); |
86acf0da | 4425 | |
8be98f9a | 4426 | skip_setup: |
a945cdc7 | 4427 | /* This starts the UST tracing */ |
fb45065e | 4428 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4429 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
fb45065e | 4430 | pthread_mutex_unlock(&app->sock_lock); |
421cb601 | 4431 | if (ret < 0) { |
ffe60014 DG |
4432 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4433 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
4434 | app->pid, ret); | |
4435 | } else { | |
4436 | DBG("UST app start session failed. Application is dead."); | |
3757b385 DG |
4437 | /* |
4438 | * This is normal behavior, an application can die during the | |
4439 | * creation process. Don't report an error so the execution can | |
4440 | * continue normally. | |
4441 | */ | |
4442 | pthread_mutex_unlock(&ua_sess->lock); | |
4443 | goto end; | |
ffe60014 | 4444 | } |
d0b96690 | 4445 | goto error_unlock; |
421cb601 | 4446 | } |
5b4a0ec0 | 4447 | |
55c3953d DG |
4448 | /* Indicate that the session has been started once */ |
4449 | ua_sess->started = 1; | |
4450 | ||
d0b96690 DG |
4451 | pthread_mutex_unlock(&ua_sess->lock); |
4452 | ||
840cb59c | 4453 | health_code_update(); |
86acf0da | 4454 | |
421cb601 | 4455 | /* Quiescent wait after starting trace */ |
fb45065e | 4456 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4457 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4458 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4459 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4460 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4461 | app->pid, ret); | |
4462 | } | |
48842b30 | 4463 | |
e0c7ec2b DG |
4464 | end: |
4465 | rcu_read_unlock(); | |
840cb59c | 4466 | health_code_update(); |
421cb601 | 4467 | return 0; |
48842b30 | 4468 | |
d0b96690 DG |
4469 | error_unlock: |
4470 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 4471 | rcu_read_unlock(); |
840cb59c | 4472 | health_code_update(); |
421cb601 DG |
4473 | return -1; |
4474 | } | |
48842b30 | 4475 | |
8be98f9a MD |
4476 | /* |
4477 | * Stop tracing for a specific UST session and app. | |
4478 | */ | |
b34cbebf | 4479 | static |
8be98f9a MD |
4480 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
4481 | { | |
4482 | int ret = 0; | |
4483 | struct ust_app_session *ua_sess; | |
7972aab2 | 4484 | struct ust_registry_session *registry; |
8be98f9a | 4485 | |
852d0037 | 4486 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
4487 | |
4488 | rcu_read_lock(); | |
4489 | ||
e0c7ec2b | 4490 | if (!app->compatible) { |
d88aee68 | 4491 | goto end_no_session; |
e0c7ec2b DG |
4492 | } |
4493 | ||
8be98f9a MD |
4494 | ua_sess = lookup_session_by_app(usess, app); |
4495 | if (ua_sess == NULL) { | |
d88aee68 | 4496 | goto end_no_session; |
8be98f9a MD |
4497 | } |
4498 | ||
d88aee68 DG |
4499 | pthread_mutex_lock(&ua_sess->lock); |
4500 | ||
b161602a MD |
4501 | if (ua_sess->deleted) { |
4502 | pthread_mutex_unlock(&ua_sess->lock); | |
4503 | goto end_no_session; | |
4504 | } | |
4505 | ||
9bc07046 DG |
4506 | /* |
4507 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
4508 | * that was never started. It's possible since we can have a fail start |
4509 | * from either the application manager thread or the command thread. Simply | |
4510 | * indicate that this is a stop error. | |
9bc07046 | 4511 | */ |
f9dfc3d9 | 4512 | if (!ua_sess->started) { |
c45536e1 DG |
4513 | goto error_rcu_unlock; |
4514 | } | |
7db205b5 | 4515 | |
840cb59c | 4516 | health_code_update(); |
86acf0da | 4517 | |
9d6c7d3f | 4518 | /* This inhibits UST tracing */ |
fb45065e | 4519 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4520 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
fb45065e | 4521 | pthread_mutex_unlock(&app->sock_lock); |
9d6c7d3f | 4522 | if (ret < 0) { |
ffe60014 DG |
4523 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4524 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
4525 | app->pid, ret); | |
4526 | } else { | |
4527 | DBG("UST app stop session failed. Application is dead."); | |
3757b385 DG |
4528 | /* |
4529 | * This is normal behavior, an application can die during the | |
4530 | * creation process. Don't report an error so the execution can | |
4531 | * continue normally. | |
4532 | */ | |
4533 | goto end_unlock; | |
ffe60014 | 4534 | } |
9d6c7d3f DG |
4535 | goto error_rcu_unlock; |
4536 | } | |
4537 | ||
840cb59c | 4538 | health_code_update(); |
86acf0da | 4539 | |
9d6c7d3f | 4540 | /* Quiescent wait after stopping trace */ |
fb45065e | 4541 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4542 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4543 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4544 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4545 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4546 | app->pid, ret); | |
4547 | } | |
9d6c7d3f | 4548 | |
840cb59c | 4549 | health_code_update(); |
86acf0da | 4550 | |
b34cbebf | 4551 | registry = get_session_registry(ua_sess); |
fad1ed2f JR |
4552 | |
4553 | /* The UST app session is held registry shall not be null. */ | |
b34cbebf | 4554 | assert(registry); |
1b532a60 | 4555 | |
ce34fcd0 MD |
4556 | /* Push metadata for application before freeing the application. */ |
4557 | (void) push_metadata(registry, ua_sess->consumer); | |
b34cbebf | 4558 | |
3757b385 | 4559 | end_unlock: |
b34cbebf MD |
4560 | pthread_mutex_unlock(&ua_sess->lock); |
4561 | end_no_session: | |
4562 | rcu_read_unlock(); | |
4563 | health_code_update(); | |
4564 | return 0; | |
4565 | ||
4566 | error_rcu_unlock: | |
4567 | pthread_mutex_unlock(&ua_sess->lock); | |
4568 | rcu_read_unlock(); | |
4569 | health_code_update(); | |
4570 | return -1; | |
4571 | } | |
4572 | ||
b34cbebf | 4573 | static |
c4b88406 MD |
4574 | int ust_app_flush_app_session(struct ust_app *app, |
4575 | struct ust_app_session *ua_sess) | |
b34cbebf | 4576 | { |
c4b88406 | 4577 | int ret, retval = 0; |
b34cbebf | 4578 | struct lttng_ht_iter iter; |
b34cbebf | 4579 | struct ust_app_channel *ua_chan; |
c4b88406 | 4580 | struct consumer_socket *socket; |
b34cbebf | 4581 | |
c4b88406 | 4582 | DBG("Flushing app session buffers for ust app pid %d", app->pid); |
b34cbebf MD |
4583 | |
4584 | rcu_read_lock(); | |
4585 | ||
4586 | if (!app->compatible) { | |
c4b88406 | 4587 | goto end_not_compatible; |
b34cbebf MD |
4588 | } |
4589 | ||
4590 | pthread_mutex_lock(&ua_sess->lock); | |
4591 | ||
b161602a MD |
4592 | if (ua_sess->deleted) { |
4593 | goto end_deleted; | |
4594 | } | |
4595 | ||
b34cbebf MD |
4596 | health_code_update(); |
4597 | ||
9d6c7d3f | 4598 | /* Flushing buffers */ |
c4b88406 MD |
4599 | socket = consumer_find_socket_by_bitness(app->bits_per_long, |
4600 | ua_sess->consumer); | |
ce34fcd0 MD |
4601 | |
4602 | /* Flush buffers and push metadata. */ | |
4603 | switch (ua_sess->buffer_type) { | |
4604 | case LTTNG_BUFFER_PER_PID: | |
4605 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, | |
4606 | node.node) { | |
4607 | health_code_update(); | |
ce34fcd0 MD |
4608 | ret = consumer_flush_channel(socket, ua_chan->key); |
4609 | if (ret) { | |
4610 | ERR("Error flushing consumer channel"); | |
4611 | retval = -1; | |
4612 | continue; | |
4613 | } | |
8be98f9a | 4614 | } |
ce34fcd0 MD |
4615 | break; |
4616 | case LTTNG_BUFFER_PER_UID: | |
4617 | default: | |
4618 | assert(0); | |
4619 | break; | |
8be98f9a | 4620 | } |
8be98f9a | 4621 | |
840cb59c | 4622 | health_code_update(); |
86acf0da | 4623 | |
b161602a | 4624 | end_deleted: |
d88aee68 | 4625 | pthread_mutex_unlock(&ua_sess->lock); |
ce34fcd0 | 4626 | |
c4b88406 MD |
4627 | end_not_compatible: |
4628 | rcu_read_unlock(); | |
4629 | health_code_update(); | |
4630 | return retval; | |
4631 | } | |
4632 | ||
4633 | /* | |
ce34fcd0 MD |
4634 | * Flush buffers for all applications for a specific UST session. |
4635 | * Called with UST session lock held. | |
c4b88406 MD |
4636 | */ |
4637 | static | |
ce34fcd0 | 4638 | int ust_app_flush_session(struct ltt_ust_session *usess) |
c4b88406 MD |
4639 | |
4640 | { | |
99b1411c | 4641 | int ret = 0; |
c4b88406 | 4642 | |
ce34fcd0 | 4643 | DBG("Flushing session buffers for all ust apps"); |
c4b88406 MD |
4644 | |
4645 | rcu_read_lock(); | |
4646 | ||
ce34fcd0 MD |
4647 | /* Flush buffers and push metadata. */ |
4648 | switch (usess->buffer_type) { | |
4649 | case LTTNG_BUFFER_PER_UID: | |
4650 | { | |
4651 | struct buffer_reg_uid *reg; | |
4652 | struct lttng_ht_iter iter; | |
4653 | ||
4654 | /* Flush all per UID buffers associated to that session. */ | |
4655 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
4656 | struct ust_registry_session *ust_session_reg; | |
4657 | struct buffer_reg_channel *reg_chan; | |
4658 | struct consumer_socket *socket; | |
4659 | ||
4660 | /* Get consumer socket to use to push the metadata.*/ | |
4661 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
4662 | usess->consumer); | |
4663 | if (!socket) { | |
4664 | /* Ignore request if no consumer is found for the session. */ | |
4665 | continue; | |
4666 | } | |
4667 | ||
4668 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
4669 | reg_chan, node.node) { | |
4670 | /* | |
4671 | * The following call will print error values so the return | |
4672 | * code is of little importance because whatever happens, we | |
4673 | * have to try them all. | |
4674 | */ | |
4675 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
4676 | } | |
4677 | ||
4678 | ust_session_reg = reg->registry->reg.ust; | |
4679 | /* Push metadata. */ | |
4680 | (void) push_metadata(ust_session_reg, usess->consumer); | |
4681 | } | |
ce34fcd0 MD |
4682 | break; |
4683 | } | |
4684 | case LTTNG_BUFFER_PER_PID: | |
4685 | { | |
4686 | struct ust_app_session *ua_sess; | |
4687 | struct lttng_ht_iter iter; | |
4688 | struct ust_app *app; | |
4689 | ||
4690 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4691 | ua_sess = lookup_session_by_app(usess, app); | |
4692 | if (ua_sess == NULL) { | |
4693 | continue; | |
4694 | } | |
4695 | (void) ust_app_flush_app_session(app, ua_sess); | |
4696 | } | |
4697 | break; | |
4698 | } | |
4699 | default: | |
99b1411c | 4700 | ret = -1; |
ce34fcd0 MD |
4701 | assert(0); |
4702 | break; | |
c4b88406 | 4703 | } |
c4b88406 | 4704 | |
7db205b5 | 4705 | rcu_read_unlock(); |
840cb59c | 4706 | health_code_update(); |
c4b88406 | 4707 | return ret; |
8be98f9a MD |
4708 | } |
4709 | ||
0dd01979 MD |
4710 | static |
4711 | int ust_app_clear_quiescent_app_session(struct ust_app *app, | |
4712 | struct ust_app_session *ua_sess) | |
4713 | { | |
4714 | int ret = 0; | |
4715 | struct lttng_ht_iter iter; | |
4716 | struct ust_app_channel *ua_chan; | |
4717 | struct consumer_socket *socket; | |
4718 | ||
4719 | DBG("Clearing stream quiescent state for ust app pid %d", app->pid); | |
4720 | ||
4721 | rcu_read_lock(); | |
4722 | ||
4723 | if (!app->compatible) { | |
4724 | goto end_not_compatible; | |
4725 | } | |
4726 | ||
4727 | pthread_mutex_lock(&ua_sess->lock); | |
4728 | ||
4729 | if (ua_sess->deleted) { | |
4730 | goto end_unlock; | |
4731 | } | |
4732 | ||
4733 | health_code_update(); | |
4734 | ||
4735 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
4736 | ua_sess->consumer); | |
4737 | if (!socket) { | |
4738 | ERR("Failed to find consumer (%" PRIu32 ") socket", | |
4739 | app->bits_per_long); | |
4740 | ret = -1; | |
4741 | goto end_unlock; | |
4742 | } | |
4743 | ||
4744 | /* Clear quiescent state. */ | |
4745 | switch (ua_sess->buffer_type) { | |
4746 | case LTTNG_BUFFER_PER_PID: | |
4747 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, | |
4748 | ua_chan, node.node) { | |
4749 | health_code_update(); | |
4750 | ret = consumer_clear_quiescent_channel(socket, | |
4751 | ua_chan->key); | |
4752 | if (ret) { | |
4753 | ERR("Error clearing quiescent state for consumer channel"); | |
4754 | ret = -1; | |
4755 | continue; | |
4756 | } | |
4757 | } | |
4758 | break; | |
4759 | case LTTNG_BUFFER_PER_UID: | |
4760 | default: | |
4761 | assert(0); | |
4762 | ret = -1; | |
4763 | break; | |
4764 | } | |
4765 | ||
4766 | health_code_update(); | |
4767 | ||
4768 | end_unlock: | |
4769 | pthread_mutex_unlock(&ua_sess->lock); | |
4770 | ||
4771 | end_not_compatible: | |
4772 | rcu_read_unlock(); | |
4773 | health_code_update(); | |
4774 | return ret; | |
4775 | } | |
4776 | ||
4777 | /* | |
4778 | * Clear quiescent state in each stream for all applications for a | |
4779 | * specific UST session. | |
4780 | * Called with UST session lock held. | |
4781 | */ | |
4782 | static | |
4783 | int ust_app_clear_quiescent_session(struct ltt_ust_session *usess) | |
4784 | ||
4785 | { | |
4786 | int ret = 0; | |
4787 | ||
4788 | DBG("Clearing stream quiescent state for all ust apps"); | |
4789 | ||
4790 | rcu_read_lock(); | |
4791 | ||
4792 | switch (usess->buffer_type) { | |
4793 | case LTTNG_BUFFER_PER_UID: | |
4794 | { | |
4795 | struct lttng_ht_iter iter; | |
4796 | struct buffer_reg_uid *reg; | |
4797 | ||
4798 | /* | |
4799 | * Clear quiescent for all per UID buffers associated to | |
4800 | * that session. | |
4801 | */ | |
4802 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
4803 | struct consumer_socket *socket; | |
4804 | struct buffer_reg_channel *reg_chan; | |
4805 | ||
4806 | /* Get associated consumer socket.*/ | |
4807 | socket = consumer_find_socket_by_bitness( | |
4808 | reg->bits_per_long, usess->consumer); | |
4809 | if (!socket) { | |
4810 | /* | |
4811 | * Ignore request if no consumer is found for | |
4812 | * the session. | |
4813 | */ | |
4814 | continue; | |
4815 | } | |
4816 | ||
4817 | cds_lfht_for_each_entry(reg->registry->channels->ht, | |
4818 | &iter.iter, reg_chan, node.node) { | |
4819 | /* | |
4820 | * The following call will print error values so | |
4821 | * the return code is of little importance | |
4822 | * because whatever happens, we have to try them | |
4823 | * all. | |
4824 | */ | |
4825 | (void) consumer_clear_quiescent_channel(socket, | |
4826 | reg_chan->consumer_key); | |
4827 | } | |
4828 | } | |
4829 | break; | |
4830 | } | |
4831 | case LTTNG_BUFFER_PER_PID: | |
4832 | { | |
4833 | struct ust_app_session *ua_sess; | |
4834 | struct lttng_ht_iter iter; | |
4835 | struct ust_app *app; | |
4836 | ||
4837 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, | |
4838 | pid_n.node) { | |
4839 | ua_sess = lookup_session_by_app(usess, app); | |
4840 | if (ua_sess == NULL) { | |
4841 | continue; | |
4842 | } | |
4843 | (void) ust_app_clear_quiescent_app_session(app, | |
4844 | ua_sess); | |
4845 | } | |
4846 | break; | |
4847 | } | |
4848 | default: | |
4849 | ret = -1; | |
4850 | assert(0); | |
4851 | break; | |
4852 | } | |
4853 | ||
4854 | rcu_read_unlock(); | |
4855 | health_code_update(); | |
4856 | return ret; | |
4857 | } | |
4858 | ||
84cd17c6 MD |
4859 | /* |
4860 | * Destroy a specific UST session in apps. | |
4861 | */ | |
3353de95 | 4862 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 4863 | { |
ffe60014 | 4864 | int ret; |
84cd17c6 | 4865 | struct ust_app_session *ua_sess; |
bec39940 | 4866 | struct lttng_ht_iter iter; |
d9bf3ca4 | 4867 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 4868 | |
852d0037 | 4869 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
4870 | |
4871 | rcu_read_lock(); | |
4872 | ||
e0c7ec2b DG |
4873 | if (!app->compatible) { |
4874 | goto end; | |
4875 | } | |
4876 | ||
84cd17c6 | 4877 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 4878 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 4879 | if (node == NULL) { |
d42f20df DG |
4880 | /* Session is being or is deleted. */ |
4881 | goto end; | |
84cd17c6 MD |
4882 | } |
4883 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 4884 | |
840cb59c | 4885 | health_code_update(); |
d0b96690 | 4886 | destroy_app_session(app, ua_sess); |
84cd17c6 | 4887 | |
840cb59c | 4888 | health_code_update(); |
7db205b5 | 4889 | |
84cd17c6 | 4890 | /* Quiescent wait after stopping trace */ |
fb45065e | 4891 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4892 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4893 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4894 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4895 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4896 | app->pid, ret); | |
4897 | } | |
e0c7ec2b DG |
4898 | end: |
4899 | rcu_read_unlock(); | |
840cb59c | 4900 | health_code_update(); |
84cd17c6 | 4901 | return 0; |
84cd17c6 MD |
4902 | } |
4903 | ||
5b4a0ec0 DG |
4904 | /* |
4905 | * Start tracing for the UST session. | |
4906 | */ | |
421cb601 DG |
4907 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
4908 | { | |
bec39940 | 4909 | struct lttng_ht_iter iter; |
421cb601 | 4910 | struct ust_app *app; |
48842b30 | 4911 | |
421cb601 DG |
4912 | DBG("Starting all UST traces"); |
4913 | ||
bb2452c8 MD |
4914 | /* |
4915 | * Even though the start trace might fail, flag this session active so | |
4916 | * other application coming in are started by default. | |
4917 | */ | |
4918 | usess->active = 1; | |
4919 | ||
421cb601 | 4920 | rcu_read_lock(); |
421cb601 | 4921 | |
0dd01979 MD |
4922 | /* |
4923 | * In a start-stop-start use-case, we need to clear the quiescent state | |
4924 | * of each channel set by the prior stop command, thus ensuring that a | |
4925 | * following stop or destroy is sure to grab a timestamp_end near those | |
4926 | * operations, even if the packet is empty. | |
4927 | */ | |
4928 | (void) ust_app_clear_quiescent_session(usess); | |
4929 | ||
0498a00c MD |
4930 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4931 | ust_app_global_update(usess, app); | |
4932 | } | |
4933 | ||
48842b30 DG |
4934 | rcu_read_unlock(); |
4935 | ||
4936 | return 0; | |
4937 | } | |
487cf67c | 4938 | |
8be98f9a MD |
4939 | /* |
4940 | * Start tracing for the UST session. | |
ce34fcd0 | 4941 | * Called with UST session lock held. |
8be98f9a MD |
4942 | */ |
4943 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
4944 | { | |
4945 | int ret = 0; | |
bec39940 | 4946 | struct lttng_ht_iter iter; |
8be98f9a MD |
4947 | struct ust_app *app; |
4948 | ||
4949 | DBG("Stopping all UST traces"); | |
4950 | ||
bb2452c8 MD |
4951 | /* |
4952 | * Even though the stop trace might fail, flag this session inactive so | |
4953 | * other application coming in are not started by default. | |
4954 | */ | |
4955 | usess->active = 0; | |
4956 | ||
8be98f9a MD |
4957 | rcu_read_lock(); |
4958 | ||
b34cbebf MD |
4959 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4960 | ret = ust_app_stop_trace(usess, app); | |
4961 | if (ret < 0) { | |
4962 | /* Continue to next apps even on error */ | |
4963 | continue; | |
4964 | } | |
4965 | } | |
4966 | ||
ce34fcd0 | 4967 | (void) ust_app_flush_session(usess); |
8be98f9a MD |
4968 | |
4969 | rcu_read_unlock(); | |
4970 | ||
4971 | return 0; | |
4972 | } | |
4973 | ||
84cd17c6 MD |
4974 | /* |
4975 | * Destroy app UST session. | |
4976 | */ | |
4977 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
4978 | { | |
4979 | int ret = 0; | |
bec39940 | 4980 | struct lttng_ht_iter iter; |
84cd17c6 MD |
4981 | struct ust_app *app; |
4982 | ||
4983 | DBG("Destroy all UST traces"); | |
4984 | ||
4985 | rcu_read_lock(); | |
4986 | ||
852d0037 | 4987 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 4988 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
4989 | if (ret < 0) { |
4990 | /* Continue to next apps even on error */ | |
4991 | continue; | |
4992 | } | |
4993 | } | |
4994 | ||
4995 | rcu_read_unlock(); | |
4996 | ||
4997 | return 0; | |
4998 | } | |
4999 | ||
88e3c2f5 | 5000 | /* The ua_sess lock must be held by the caller. */ |
a9ad0c8f | 5001 | static |
88e3c2f5 JG |
5002 | int find_or_create_ust_app_channel( |
5003 | struct ltt_ust_session *usess, | |
5004 | struct ust_app_session *ua_sess, | |
5005 | struct ust_app *app, | |
5006 | struct ltt_ust_channel *uchan, | |
5007 | struct ust_app_channel **ua_chan) | |
487cf67c | 5008 | { |
55c54cce | 5009 | int ret = 0; |
88e3c2f5 JG |
5010 | struct lttng_ht_iter iter; |
5011 | struct lttng_ht_node_str *ua_chan_node; | |
5012 | ||
5013 | lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &iter); | |
5014 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
5015 | if (ua_chan_node) { | |
5016 | *ua_chan = caa_container_of(ua_chan_node, | |
5017 | struct ust_app_channel, node); | |
5018 | goto end; | |
5019 | } | |
5020 | ||
5021 | ret = ust_app_channel_create(usess, ua_sess, uchan, app, ua_chan); | |
5022 | if (ret) { | |
5023 | goto end; | |
5024 | } | |
5025 | end: | |
5026 | return ret; | |
5027 | } | |
5028 | ||
5029 | static | |
5030 | int ust_app_channel_synchronize_event(struct ust_app_channel *ua_chan, | |
5031 | struct ltt_ust_event *uevent, struct ust_app_session *ua_sess, | |
5032 | struct ust_app *app) | |
5033 | { | |
5034 | int ret = 0; | |
5035 | struct ust_app_event *ua_event = NULL; | |
5036 | ||
5037 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
5038 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); | |
5039 | if (!ua_event) { | |
5040 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); | |
5041 | if (ret < 0) { | |
5042 | goto end; | |
5043 | } | |
5044 | } else { | |
5045 | if (ua_event->enabled != uevent->enabled) { | |
5046 | ret = uevent->enabled ? | |
5047 | enable_ust_app_event(ua_sess, ua_event, app) : | |
5048 | disable_ust_app_event(ua_sess, ua_event, app); | |
5049 | } | |
5050 | } | |
5051 | ||
5052 | end: | |
5053 | return ret; | |
5054 | } | |
5055 | ||
5056 | /* | |
5057 | * The caller must ensure that the application is compatible and is tracked | |
5058 | * by the PID tracker. | |
5059 | */ | |
5060 | static | |
5061 | void ust_app_synchronize(struct ltt_ust_session *usess, | |
5062 | struct ust_app *app) | |
5063 | { | |
5064 | int ret = 0; | |
5065 | struct cds_lfht_iter uchan_iter; | |
5066 | struct ltt_ust_channel *uchan; | |
3d8ca23b | 5067 | struct ust_app_session *ua_sess = NULL; |
1f3580c7 | 5068 | |
88e3c2f5 JG |
5069 | /* |
5070 | * The application's configuration should only be synchronized for | |
5071 | * active sessions. | |
5072 | */ | |
5073 | assert(usess->active); | |
5074 | ||
5075 | ret = find_or_create_ust_app_session(usess, app, &ua_sess, NULL); | |
3d8ca23b DG |
5076 | if (ret < 0) { |
5077 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
5078 | goto error; |
5079 | } | |
3d8ca23b | 5080 | assert(ua_sess); |
487cf67c | 5081 | |
d0b96690 | 5082 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
5083 | if (ua_sess->deleted) { |
5084 | pthread_mutex_unlock(&ua_sess->lock); | |
5085 | goto end; | |
5086 | } | |
5087 | ||
88e3c2f5 JG |
5088 | rcu_read_lock(); |
5089 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &uchan_iter, | |
5090 | uchan, node.node) { | |
5091 | struct ust_app_channel *ua_chan; | |
5092 | struct cds_lfht_iter uevent_iter; | |
5093 | struct ltt_ust_event *uevent; | |
487cf67c | 5094 | |
31746f93 | 5095 | /* |
88e3c2f5 JG |
5096 | * Search for a matching ust_app_channel. If none is found, |
5097 | * create it. Creating the channel will cause the ua_chan | |
5098 | * structure to be allocated, the channel buffers to be | |
5099 | * allocated (if necessary) and sent to the application, and | |
5100 | * all enabled contexts will be added to the channel. | |
31746f93 | 5101 | */ |
88e3c2f5 JG |
5102 | ret = find_or_create_ust_app_channel(usess, ua_sess, |
5103 | app, uchan, &ua_chan); | |
5104 | if (ret) { | |
5105 | /* Tracer is probably gone or ENOMEM. */ | |
5106 | goto error_unlock; | |
727d5404 DG |
5107 | } |
5108 | ||
88e3c2f5 JG |
5109 | if (!ua_chan) { |
5110 | /* ua_chan will be NULL for the metadata channel */ | |
5111 | continue; | |
5112 | } | |
727d5404 | 5113 | |
88e3c2f5 | 5114 | cds_lfht_for_each_entry(uchan->events->ht, &uevent_iter, uevent, |
bec39940 | 5115 | node.node) { |
88e3c2f5 JG |
5116 | ret = ust_app_channel_synchronize_event(ua_chan, |
5117 | uevent, ua_sess, app); | |
5118 | if (ret) { | |
d0b96690 | 5119 | goto error_unlock; |
487cf67c | 5120 | } |
36dc12cc | 5121 | } |
d0b96690 | 5122 | |
88e3c2f5 JG |
5123 | if (ua_chan->enabled != uchan->enabled) { |
5124 | ret = uchan->enabled ? | |
5125 | enable_ust_app_channel(ua_sess, uchan, app) : | |
5126 | disable_ust_app_channel(ua_sess, ua_chan, app); | |
5127 | if (ret) { | |
5128 | goto error_unlock; | |
5129 | } | |
5130 | } | |
36dc12cc | 5131 | } |
88e3c2f5 | 5132 | rcu_read_unlock(); |
0498a00c | 5133 | |
a9ad0c8f | 5134 | end: |
88e3c2f5 | 5135 | pthread_mutex_unlock(&ua_sess->lock); |
ffe60014 | 5136 | /* Everything went well at this point. */ |
ffe60014 DG |
5137 | return; |
5138 | ||
d0b96690 | 5139 | error_unlock: |
88e3c2f5 | 5140 | rcu_read_unlock(); |
d0b96690 | 5141 | pthread_mutex_unlock(&ua_sess->lock); |
487cf67c | 5142 | error: |
ffe60014 | 5143 | if (ua_sess) { |
d0b96690 | 5144 | destroy_app_session(app, ua_sess); |
ffe60014 | 5145 | } |
487cf67c DG |
5146 | return; |
5147 | } | |
55cc08a6 | 5148 | |
a9ad0c8f MD |
5149 | static |
5150 | void ust_app_global_destroy(struct ltt_ust_session *usess, struct ust_app *app) | |
5151 | { | |
5152 | struct ust_app_session *ua_sess; | |
5153 | ||
5154 | ua_sess = lookup_session_by_app(usess, app); | |
5155 | if (ua_sess == NULL) { | |
5156 | return; | |
5157 | } | |
5158 | destroy_app_session(app, ua_sess); | |
5159 | } | |
5160 | ||
5161 | /* | |
5162 | * Add channels/events from UST global domain to registered apps at sock. | |
5163 | * | |
5164 | * Called with session lock held. | |
5165 | * Called with RCU read-side lock held. | |
5166 | */ | |
5167 | void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app) | |
5168 | { | |
5169 | assert(usess); | |
88e3c2f5 | 5170 | assert(usess->active); |
a9ad0c8f MD |
5171 | |
5172 | DBG2("UST app global update for app sock %d for session id %" PRIu64, | |
5173 | app->sock, usess->id); | |
5174 | ||
5175 | if (!app->compatible) { | |
5176 | return; | |
5177 | } | |
a9ad0c8f | 5178 | if (trace_ust_pid_tracker_lookup(usess, app->pid)) { |
88e3c2f5 JG |
5179 | /* |
5180 | * Synchronize the application's internal tracing configuration | |
5181 | * and start tracing. | |
5182 | */ | |
5183 | ust_app_synchronize(usess, app); | |
5184 | ust_app_start_trace(usess, app); | |
a9ad0c8f MD |
5185 | } else { |
5186 | ust_app_global_destroy(usess, app); | |
5187 | } | |
5188 | } | |
5189 | ||
5190 | /* | |
5191 | * Called with session lock held. | |
5192 | */ | |
5193 | void ust_app_global_update_all(struct ltt_ust_session *usess) | |
5194 | { | |
5195 | struct lttng_ht_iter iter; | |
5196 | struct ust_app *app; | |
5197 | ||
5198 | rcu_read_lock(); | |
5199 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5200 | ust_app_global_update(usess, app); | |
5201 | } | |
5202 | rcu_read_unlock(); | |
5203 | } | |
5204 | ||
55cc08a6 DG |
5205 | /* |
5206 | * Add context to a specific channel for global UST domain. | |
5207 | */ | |
5208 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
5209 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
5210 | { | |
5211 | int ret = 0; | |
bec39940 DG |
5212 | struct lttng_ht_node_str *ua_chan_node; |
5213 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
5214 | struct ust_app_channel *ua_chan = NULL; |
5215 | struct ust_app_session *ua_sess; | |
5216 | struct ust_app *app; | |
5217 | ||
88e3c2f5 | 5218 | assert(usess->active); |
0498a00c | 5219 | |
55cc08a6 | 5220 | rcu_read_lock(); |
852d0037 | 5221 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
5222 | if (!app->compatible) { |
5223 | /* | |
5224 | * TODO: In time, we should notice the caller of this error by | |
5225 | * telling him that this is a version error. | |
5226 | */ | |
5227 | continue; | |
5228 | } | |
55cc08a6 DG |
5229 | ua_sess = lookup_session_by_app(usess, app); |
5230 | if (ua_sess == NULL) { | |
5231 | continue; | |
5232 | } | |
5233 | ||
d0b96690 | 5234 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
5235 | |
5236 | if (ua_sess->deleted) { | |
5237 | pthread_mutex_unlock(&ua_sess->lock); | |
5238 | continue; | |
5239 | } | |
5240 | ||
55cc08a6 | 5241 | /* Lookup channel in the ust app session */ |
bec39940 DG |
5242 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
5243 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 5244 | if (ua_chan_node == NULL) { |
d0b96690 | 5245 | goto next_app; |
55cc08a6 DG |
5246 | } |
5247 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
5248 | node); | |
c9edf082 | 5249 | ret = create_ust_app_channel_context(ua_chan, &uctx->ctx, app); |
55cc08a6 | 5250 | if (ret < 0) { |
d0b96690 | 5251 | goto next_app; |
55cc08a6 | 5252 | } |
d0b96690 DG |
5253 | next_app: |
5254 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
5255 | } |
5256 | ||
55cc08a6 | 5257 | rcu_read_unlock(); |
76d45b40 DG |
5258 | return ret; |
5259 | } | |
7f79d3a1 | 5260 | |
d0b96690 DG |
5261 | /* |
5262 | * Receive registration and populate the given msg structure. | |
5263 | * | |
5264 | * On success return 0 else a negative value returned by the ustctl call. | |
5265 | */ | |
5266 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
5267 | { | |
5268 | int ret; | |
5269 | uint32_t pid, ppid, uid, gid; | |
5270 | ||
5271 | assert(msg); | |
5272 | ||
5273 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
5274 | &pid, &ppid, &uid, &gid, | |
5275 | &msg->bits_per_long, | |
5276 | &msg->uint8_t_alignment, | |
5277 | &msg->uint16_t_alignment, | |
5278 | &msg->uint32_t_alignment, | |
5279 | &msg->uint64_t_alignment, | |
5280 | &msg->long_alignment, | |
5281 | &msg->byte_order, | |
5282 | msg->name); | |
5283 | if (ret < 0) { | |
5284 | switch (-ret) { | |
5285 | case EPIPE: | |
5286 | case ECONNRESET: | |
5287 | case LTTNG_UST_ERR_EXITING: | |
5288 | DBG3("UST app recv reg message failed. Application died"); | |
5289 | break; | |
5290 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
5291 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
5292 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
5293 | LTTNG_UST_ABI_MINOR_VERSION); | |
5294 | break; | |
5295 | default: | |
5296 | ERR("UST app recv reg message failed with ret %d", ret); | |
5297 | break; | |
5298 | } | |
5299 | goto error; | |
5300 | } | |
5301 | msg->pid = (pid_t) pid; | |
5302 | msg->ppid = (pid_t) ppid; | |
5303 | msg->uid = (uid_t) uid; | |
5304 | msg->gid = (gid_t) gid; | |
5305 | ||
5306 | error: | |
5307 | return ret; | |
5308 | } | |
5309 | ||
10b56aef MD |
5310 | /* |
5311 | * Return a ust app session object using the application object and the | |
5312 | * session object descriptor has a key. If not found, NULL is returned. | |
5313 | * A RCU read side lock MUST be acquired when calling this function. | |
5314 | */ | |
5315 | static struct ust_app_session *find_session_by_objd(struct ust_app *app, | |
5316 | int objd) | |
5317 | { | |
5318 | struct lttng_ht_node_ulong *node; | |
5319 | struct lttng_ht_iter iter; | |
5320 | struct ust_app_session *ua_sess = NULL; | |
5321 | ||
5322 | assert(app); | |
5323 | ||
5324 | lttng_ht_lookup(app->ust_sessions_objd, (void *)((unsigned long) objd), &iter); | |
5325 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5326 | if (node == NULL) { | |
5327 | DBG2("UST app session find by objd %d not found", objd); | |
5328 | goto error; | |
5329 | } | |
5330 | ||
5331 | ua_sess = caa_container_of(node, struct ust_app_session, ust_objd_node); | |
5332 | ||
5333 | error: | |
5334 | return ua_sess; | |
5335 | } | |
5336 | ||
d88aee68 DG |
5337 | /* |
5338 | * Return a ust app channel object using the application object and the channel | |
5339 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
5340 | * lock MUST be acquired before calling this function. | |
5341 | */ | |
d0b96690 DG |
5342 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
5343 | int objd) | |
5344 | { | |
5345 | struct lttng_ht_node_ulong *node; | |
5346 | struct lttng_ht_iter iter; | |
5347 | struct ust_app_channel *ua_chan = NULL; | |
5348 | ||
5349 | assert(app); | |
5350 | ||
5351 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
5352 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5353 | if (node == NULL) { | |
5354 | DBG2("UST app channel find by objd %d not found", objd); | |
5355 | goto error; | |
5356 | } | |
5357 | ||
5358 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
5359 | ||
5360 | error: | |
5361 | return ua_chan; | |
5362 | } | |
5363 | ||
d88aee68 DG |
5364 | /* |
5365 | * Reply to a register channel notification from an application on the notify | |
5366 | * socket. The channel metadata is also created. | |
5367 | * | |
5368 | * The session UST registry lock is acquired in this function. | |
5369 | * | |
5370 | * On success 0 is returned else a negative value. | |
5371 | */ | |
8eede835 | 5372 | static int reply_ust_register_channel(int sock, int cobjd, |
d0b96690 DG |
5373 | size_t nr_fields, struct ustctl_field *fields) |
5374 | { | |
5375 | int ret, ret_code = 0; | |
294e218e | 5376 | uint32_t chan_id; |
7972aab2 | 5377 | uint64_t chan_reg_key; |
d0b96690 DG |
5378 | enum ustctl_channel_header type; |
5379 | struct ust_app *app; | |
5380 | struct ust_app_channel *ua_chan; | |
5381 | struct ust_app_session *ua_sess; | |
7972aab2 | 5382 | struct ust_registry_session *registry; |
45893984 | 5383 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
5384 | |
5385 | rcu_read_lock(); | |
5386 | ||
5387 | /* Lookup application. If not found, there is a code flow error. */ | |
5388 | app = find_app_by_notify_sock(sock); | |
d88aee68 | 5389 | if (!app) { |
fad1ed2f | 5390 | DBG("Application socket %d is being torn down. Abort event notify", |
d88aee68 DG |
5391 | sock); |
5392 | ret = 0; | |
5393 | goto error_rcu_unlock; | |
5394 | } | |
d0b96690 | 5395 | |
4950b860 | 5396 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 5397 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 | 5398 | if (!ua_chan) { |
fad1ed2f | 5399 | DBG("Application channel is being torn down. Abort event notify"); |
4950b860 MD |
5400 | ret = 0; |
5401 | goto error_rcu_unlock; | |
5402 | } | |
5403 | ||
d0b96690 DG |
5404 | assert(ua_chan->session); |
5405 | ua_sess = ua_chan->session; | |
d0b96690 | 5406 | |
7972aab2 DG |
5407 | /* Get right session registry depending on the session buffer type. */ |
5408 | registry = get_session_registry(ua_sess); | |
fad1ed2f JR |
5409 | if (!registry) { |
5410 | DBG("Application session is being torn down. Abort event notify"); | |
5411 | ret = 0; | |
5412 | goto error_rcu_unlock; | |
5413 | }; | |
45893984 | 5414 | |
7972aab2 DG |
5415 | /* Depending on the buffer type, a different channel key is used. */ |
5416 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
5417 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 5418 | } else { |
7972aab2 | 5419 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
5420 | } |
5421 | ||
7972aab2 DG |
5422 | pthread_mutex_lock(®istry->lock); |
5423 | ||
5424 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
5425 | assert(chan_reg); | |
5426 | ||
5427 | if (!chan_reg->register_done) { | |
294e218e MD |
5428 | /* |
5429 | * TODO: eventually use the registry event count for | |
5430 | * this channel to better guess header type for per-pid | |
5431 | * buffers. | |
5432 | */ | |
5433 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
7972aab2 DG |
5434 | chan_reg->nr_ctx_fields = nr_fields; |
5435 | chan_reg->ctx_fields = fields; | |
fad1ed2f | 5436 | fields = NULL; |
7972aab2 | 5437 | chan_reg->header_type = type; |
d0b96690 | 5438 | } else { |
7972aab2 DG |
5439 | /* Get current already assigned values. */ |
5440 | type = chan_reg->header_type; | |
d0b96690 | 5441 | } |
7972aab2 DG |
5442 | /* Channel id is set during the object creation. */ |
5443 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
5444 | |
5445 | /* Append to metadata */ | |
7972aab2 DG |
5446 | if (!chan_reg->metadata_dumped) { |
5447 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
5448 | if (ret_code) { |
5449 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
5450 | goto reply; | |
5451 | } | |
5452 | } | |
5453 | ||
5454 | reply: | |
7972aab2 DG |
5455 | DBG3("UST app replying to register channel key %" PRIu64 |
5456 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
5457 | ret_code); | |
d0b96690 DG |
5458 | |
5459 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
5460 | if (ret < 0) { | |
5461 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5462 | ERR("UST app reply channel failed with ret %d", ret); | |
5463 | } else { | |
5464 | DBG3("UST app reply channel failed. Application died"); | |
5465 | } | |
5466 | goto error; | |
5467 | } | |
5468 | ||
7972aab2 DG |
5469 | /* This channel registry registration is completed. */ |
5470 | chan_reg->register_done = 1; | |
5471 | ||
d0b96690 | 5472 | error: |
7972aab2 | 5473 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 5474 | error_rcu_unlock: |
d0b96690 | 5475 | rcu_read_unlock(); |
fad1ed2f | 5476 | free(fields); |
d0b96690 DG |
5477 | return ret; |
5478 | } | |
5479 | ||
d88aee68 DG |
5480 | /* |
5481 | * Add event to the UST channel registry. When the event is added to the | |
5482 | * registry, the metadata is also created. Once done, this replies to the | |
5483 | * application with the appropriate error code. | |
5484 | * | |
5485 | * The session UST registry lock is acquired in the function. | |
5486 | * | |
5487 | * On success 0 is returned else a negative value. | |
5488 | */ | |
d0b96690 | 5489 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
2106efa0 PP |
5490 | char *sig, size_t nr_fields, struct ustctl_field *fields, |
5491 | int loglevel_value, char *model_emf_uri) | |
d0b96690 DG |
5492 | { |
5493 | int ret, ret_code; | |
5494 | uint32_t event_id = 0; | |
7972aab2 | 5495 | uint64_t chan_reg_key; |
d0b96690 DG |
5496 | struct ust_app *app; |
5497 | struct ust_app_channel *ua_chan; | |
5498 | struct ust_app_session *ua_sess; | |
7972aab2 | 5499 | struct ust_registry_session *registry; |
d0b96690 DG |
5500 | |
5501 | rcu_read_lock(); | |
5502 | ||
5503 | /* Lookup application. If not found, there is a code flow error. */ | |
5504 | app = find_app_by_notify_sock(sock); | |
d88aee68 | 5505 | if (!app) { |
fad1ed2f | 5506 | DBG("Application socket %d is being torn down. Abort event notify", |
d88aee68 DG |
5507 | sock); |
5508 | ret = 0; | |
5509 | goto error_rcu_unlock; | |
5510 | } | |
d0b96690 | 5511 | |
4950b860 | 5512 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 5513 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 | 5514 | if (!ua_chan) { |
fad1ed2f | 5515 | DBG("Application channel is being torn down. Abort event notify"); |
4950b860 MD |
5516 | ret = 0; |
5517 | goto error_rcu_unlock; | |
5518 | } | |
5519 | ||
d0b96690 DG |
5520 | assert(ua_chan->session); |
5521 | ua_sess = ua_chan->session; | |
5522 | ||
7972aab2 | 5523 | registry = get_session_registry(ua_sess); |
fad1ed2f JR |
5524 | if (!registry) { |
5525 | DBG("Application session is being torn down. Abort event notify"); | |
5526 | ret = 0; | |
5527 | goto error_rcu_unlock; | |
5528 | } | |
7972aab2 DG |
5529 | |
5530 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
5531 | chan_reg_key = ua_chan->tracing_channel_id; | |
5532 | } else { | |
5533 | chan_reg_key = ua_chan->key; | |
5534 | } | |
5535 | ||
5536 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 5537 | |
d5d629b5 DG |
5538 | /* |
5539 | * From this point on, this call acquires the ownership of the sig, fields | |
5540 | * and model_emf_uri meaning any free are done inside it if needed. These | |
5541 | * three variables MUST NOT be read/write after this. | |
5542 | */ | |
7972aab2 | 5543 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
2106efa0 PP |
5544 | sobjd, cobjd, name, sig, nr_fields, fields, |
5545 | loglevel_value, model_emf_uri, ua_sess->buffer_type, | |
5546 | &event_id, app); | |
fad1ed2f JR |
5547 | sig = NULL; |
5548 | fields = NULL; | |
5549 | model_emf_uri = NULL; | |
d0b96690 DG |
5550 | |
5551 | /* | |
5552 | * The return value is returned to ustctl so in case of an error, the | |
5553 | * application can be notified. In case of an error, it's important not to | |
5554 | * return a negative error or else the application will get closed. | |
5555 | */ | |
5556 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
5557 | if (ret < 0) { | |
5558 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5559 | ERR("UST app reply event failed with ret %d", ret); | |
5560 | } else { | |
5561 | DBG3("UST app reply event failed. Application died"); | |
5562 | } | |
5563 | /* | |
5564 | * No need to wipe the create event since the application socket will | |
5565 | * get close on error hence cleaning up everything by itself. | |
5566 | */ | |
5567 | goto error; | |
5568 | } | |
5569 | ||
7972aab2 DG |
5570 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
5571 | name, event_id); | |
d88aee68 | 5572 | |
d0b96690 | 5573 | error: |
7972aab2 | 5574 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 5575 | error_rcu_unlock: |
d0b96690 | 5576 | rcu_read_unlock(); |
fad1ed2f JR |
5577 | free(sig); |
5578 | free(fields); | |
5579 | free(model_emf_uri); | |
d0b96690 DG |
5580 | return ret; |
5581 | } | |
5582 | ||
10b56aef MD |
5583 | /* |
5584 | * Add enum to the UST session registry. Once done, this replies to the | |
5585 | * application with the appropriate error code. | |
5586 | * | |
5587 | * The session UST registry lock is acquired within this function. | |
5588 | * | |
5589 | * On success 0 is returned else a negative value. | |
5590 | */ | |
5591 | static int add_enum_ust_registry(int sock, int sobjd, char *name, | |
5592 | struct ustctl_enum_entry *entries, size_t nr_entries) | |
5593 | { | |
5594 | int ret = 0, ret_code; | |
5595 | struct ust_app *app; | |
5596 | struct ust_app_session *ua_sess; | |
5597 | struct ust_registry_session *registry; | |
5598 | uint64_t enum_id = -1ULL; | |
5599 | ||
5600 | rcu_read_lock(); | |
5601 | ||
5602 | /* Lookup application. If not found, there is a code flow error. */ | |
5603 | app = find_app_by_notify_sock(sock); | |
5604 | if (!app) { | |
5605 | /* Return an error since this is not an error */ | |
5606 | DBG("Application socket %d is being torn down. Aborting enum registration", | |
5607 | sock); | |
5608 | free(entries); | |
5609 | goto error_rcu_unlock; | |
5610 | } | |
5611 | ||
5612 | /* Lookup session by UST object descriptor. */ | |
5613 | ua_sess = find_session_by_objd(app, sobjd); | |
5614 | if (!ua_sess) { | |
5615 | /* Return an error since this is not an error */ | |
fad1ed2f | 5616 | DBG("Application session is being torn down (session not found). Aborting enum registration."); |
10b56aef MD |
5617 | free(entries); |
5618 | goto error_rcu_unlock; | |
5619 | } | |
5620 | ||
5621 | registry = get_session_registry(ua_sess); | |
fad1ed2f JR |
5622 | if (!registry) { |
5623 | DBG("Application session is being torn down (registry not found). Aborting enum registration."); | |
5624 | free(entries); | |
5625 | goto error_rcu_unlock; | |
5626 | } | |
10b56aef MD |
5627 | |
5628 | pthread_mutex_lock(®istry->lock); | |
5629 | ||
5630 | /* | |
5631 | * From this point on, the callee acquires the ownership of | |
5632 | * entries. The variable entries MUST NOT be read/written after | |
5633 | * call. | |
5634 | */ | |
5635 | ret_code = ust_registry_create_or_find_enum(registry, sobjd, name, | |
5636 | entries, nr_entries, &enum_id); | |
5637 | entries = NULL; | |
5638 | ||
5639 | /* | |
5640 | * The return value is returned to ustctl so in case of an error, the | |
5641 | * application can be notified. In case of an error, it's important not to | |
5642 | * return a negative error or else the application will get closed. | |
5643 | */ | |
5644 | ret = ustctl_reply_register_enum(sock, enum_id, ret_code); | |
5645 | if (ret < 0) { | |
5646 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5647 | ERR("UST app reply enum failed with ret %d", ret); | |
5648 | } else { | |
5649 | DBG3("UST app reply enum failed. Application died"); | |
5650 | } | |
5651 | /* | |
5652 | * No need to wipe the create enum since the application socket will | |
5653 | * get close on error hence cleaning up everything by itself. | |
5654 | */ | |
5655 | goto error; | |
5656 | } | |
5657 | ||
5658 | DBG3("UST registry enum %s added successfully or already found", name); | |
5659 | ||
5660 | error: | |
5661 | pthread_mutex_unlock(®istry->lock); | |
5662 | error_rcu_unlock: | |
5663 | rcu_read_unlock(); | |
5664 | return ret; | |
5665 | } | |
5666 | ||
d88aee68 DG |
5667 | /* |
5668 | * Handle application notification through the given notify socket. | |
5669 | * | |
5670 | * Return 0 on success or else a negative value. | |
5671 | */ | |
d0b96690 DG |
5672 | int ust_app_recv_notify(int sock) |
5673 | { | |
5674 | int ret; | |
5675 | enum ustctl_notify_cmd cmd; | |
5676 | ||
5677 | DBG3("UST app receiving notify from sock %d", sock); | |
5678 | ||
5679 | ret = ustctl_recv_notify(sock, &cmd); | |
5680 | if (ret < 0) { | |
5681 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5682 | ERR("UST app recv notify failed with ret %d", ret); | |
5683 | } else { | |
5684 | DBG3("UST app recv notify failed. Application died"); | |
5685 | } | |
5686 | goto error; | |
5687 | } | |
5688 | ||
5689 | switch (cmd) { | |
5690 | case USTCTL_NOTIFY_CMD_EVENT: | |
5691 | { | |
2106efa0 | 5692 | int sobjd, cobjd, loglevel_value; |
d0b96690 DG |
5693 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; |
5694 | size_t nr_fields; | |
5695 | struct ustctl_field *fields; | |
5696 | ||
5697 | DBG2("UST app ustctl register event received"); | |
5698 | ||
2106efa0 PP |
5699 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, |
5700 | &loglevel_value, &sig, &nr_fields, &fields, | |
5701 | &model_emf_uri); | |
d0b96690 DG |
5702 | if (ret < 0) { |
5703 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5704 | ERR("UST app recv event failed with ret %d", ret); | |
5705 | } else { | |
5706 | DBG3("UST app recv event failed. Application died"); | |
5707 | } | |
5708 | goto error; | |
5709 | } | |
5710 | ||
d5d629b5 DG |
5711 | /* |
5712 | * Add event to the UST registry coming from the notify socket. This | |
5713 | * call will free if needed the sig, fields and model_emf_uri. This | |
5714 | * code path loses the ownsership of these variables and transfer them | |
5715 | * to the this function. | |
5716 | */ | |
d0b96690 | 5717 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
2106efa0 | 5718 | fields, loglevel_value, model_emf_uri); |
d0b96690 DG |
5719 | if (ret < 0) { |
5720 | goto error; | |
5721 | } | |
5722 | ||
5723 | break; | |
5724 | } | |
5725 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
5726 | { | |
5727 | int sobjd, cobjd; | |
5728 | size_t nr_fields; | |
5729 | struct ustctl_field *fields; | |
5730 | ||
5731 | DBG2("UST app ustctl register channel received"); | |
5732 | ||
5733 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
5734 | &fields); | |
5735 | if (ret < 0) { | |
5736 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5737 | ERR("UST app recv channel failed with ret %d", ret); | |
5738 | } else { | |
5739 | DBG3("UST app recv channel failed. Application died"); | |
5740 | } | |
5741 | goto error; | |
5742 | } | |
5743 | ||
d5d629b5 DG |
5744 | /* |
5745 | * The fields ownership are transfered to this function call meaning | |
5746 | * that if needed it will be freed. After this, it's invalid to access | |
5747 | * fields or clean it up. | |
5748 | */ | |
8eede835 | 5749 | ret = reply_ust_register_channel(sock, cobjd, nr_fields, |
d0b96690 DG |
5750 | fields); |
5751 | if (ret < 0) { | |
5752 | goto error; | |
5753 | } | |
5754 | ||
5755 | break; | |
5756 | } | |
10b56aef MD |
5757 | case USTCTL_NOTIFY_CMD_ENUM: |
5758 | { | |
5759 | int sobjd; | |
5760 | char name[LTTNG_UST_SYM_NAME_LEN]; | |
5761 | size_t nr_entries; | |
5762 | struct ustctl_enum_entry *entries; | |
5763 | ||
5764 | DBG2("UST app ustctl register enum received"); | |
5765 | ||
5766 | ret = ustctl_recv_register_enum(sock, &sobjd, name, | |
5767 | &entries, &nr_entries); | |
5768 | if (ret < 0) { | |
5769 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5770 | ERR("UST app recv enum failed with ret %d", ret); | |
5771 | } else { | |
5772 | DBG3("UST app recv enum failed. Application died"); | |
5773 | } | |
5774 | goto error; | |
5775 | } | |
5776 | ||
5777 | /* Callee assumes ownership of entries */ | |
5778 | ret = add_enum_ust_registry(sock, sobjd, name, | |
5779 | entries, nr_entries); | |
5780 | if (ret < 0) { | |
5781 | goto error; | |
5782 | } | |
5783 | ||
5784 | break; | |
5785 | } | |
d0b96690 DG |
5786 | default: |
5787 | /* Should NEVER happen. */ | |
5788 | assert(0); | |
5789 | } | |
5790 | ||
5791 | error: | |
5792 | return ret; | |
5793 | } | |
d88aee68 DG |
5794 | |
5795 | /* | |
5796 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
5797 | * corresponding application. On failure, the call_rcu to close the socket is | |
5798 | * executed. If an application is found, it tries to delete it from the notify | |
5799 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
5800 | * | |
5801 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
5802 | * call RCU is not done but the rest of the cleanup is. | |
5803 | */ | |
5804 | void ust_app_notify_sock_unregister(int sock) | |
5805 | { | |
5806 | int err_enomem = 0; | |
5807 | struct lttng_ht_iter iter; | |
5808 | struct ust_app *app; | |
5809 | struct ust_app_notify_sock_obj *obj; | |
5810 | ||
5811 | assert(sock >= 0); | |
5812 | ||
5813 | rcu_read_lock(); | |
5814 | ||
5815 | obj = zmalloc(sizeof(*obj)); | |
5816 | if (!obj) { | |
5817 | /* | |
5818 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
5819 | * procedure but the call_rcu will not be called. In this case, we | |
5820 | * accept the fd leak rather than possibly creating an unsynchronized | |
5821 | * state between threads. | |
5822 | * | |
5823 | * TODO: The notify object should be created once the notify socket is | |
5824 | * registered and stored independantely from the ust app object. The | |
5825 | * tricky part is to synchronize the teardown of the application and | |
5826 | * this notify object. Let's keep that in mind so we can avoid this | |
5827 | * kind of shenanigans with ENOMEM in the teardown path. | |
5828 | */ | |
5829 | err_enomem = 1; | |
5830 | } else { | |
5831 | obj->fd = sock; | |
5832 | } | |
5833 | ||
5834 | DBG("UST app notify socket unregister %d", sock); | |
5835 | ||
5836 | /* | |
5837 | * Lookup application by notify socket. If this fails, this means that the | |
5838 | * hash table delete has already been done by the application | |
5839 | * unregistration process so we can safely close the notify socket in a | |
5840 | * call RCU. | |
5841 | */ | |
5842 | app = find_app_by_notify_sock(sock); | |
5843 | if (!app) { | |
5844 | goto close_socket; | |
5845 | } | |
5846 | ||
5847 | iter.iter.node = &app->notify_sock_n.node; | |
5848 | ||
5849 | /* | |
5850 | * Whatever happens here either we fail or succeed, in both cases we have | |
5851 | * to close the socket after a grace period to continue to the call RCU | |
5852 | * here. If the deletion is successful, the application is not visible | |
5853 | * anymore by other threads and is it fails it means that it was already | |
5854 | * deleted from the hash table so either way we just have to close the | |
5855 | * socket. | |
5856 | */ | |
5857 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
5858 | ||
5859 | close_socket: | |
5860 | rcu_read_unlock(); | |
5861 | ||
5862 | /* | |
5863 | * Close socket after a grace period to avoid for the socket to be reused | |
5864 | * before the application object is freed creating potential race between | |
5865 | * threads trying to add unique in the global hash table. | |
5866 | */ | |
5867 | if (!err_enomem) { | |
5868 | call_rcu(&obj->head, close_notify_sock_rcu); | |
5869 | } | |
5870 | } | |
f45e313d DG |
5871 | |
5872 | /* | |
5873 | * Destroy a ust app data structure and free its memory. | |
5874 | */ | |
5875 | void ust_app_destroy(struct ust_app *app) | |
5876 | { | |
5877 | if (!app) { | |
5878 | return; | |
5879 | } | |
5880 | ||
5881 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
5882 | } | |
6dc3064a DG |
5883 | |
5884 | /* | |
5885 | * Take a snapshot for a given UST session. The snapshot is sent to the given | |
5886 | * output. | |
5887 | * | |
9a654598 | 5888 | * Returns LTTNG_OK on success or a LTTNG_ERR error code. |
6dc3064a | 5889 | */ |
fb9a95c4 JG |
5890 | enum lttng_error_code ust_app_snapshot_record( |
5891 | const struct ltt_ust_session *usess, | |
348a81dc | 5892 | const struct consumer_output *output, int wait, |
d07ceecd | 5893 | uint64_t nb_packets_per_stream) |
6dc3064a DG |
5894 | { |
5895 | int ret = 0; | |
9a654598 | 5896 | enum lttng_error_code status = LTTNG_OK; |
6dc3064a DG |
5897 | struct lttng_ht_iter iter; |
5898 | struct ust_app *app; | |
affce97e | 5899 | char *trace_path = NULL; |
6dc3064a DG |
5900 | |
5901 | assert(usess); | |
5902 | assert(output); | |
5903 | ||
5904 | rcu_read_lock(); | |
5905 | ||
8c924c7b MD |
5906 | switch (usess->buffer_type) { |
5907 | case LTTNG_BUFFER_PER_UID: | |
5908 | { | |
5909 | struct buffer_reg_uid *reg; | |
6dc3064a | 5910 | |
8c924c7b MD |
5911 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
5912 | struct buffer_reg_channel *reg_chan; | |
5913 | struct consumer_socket *socket; | |
3b967712 | 5914 | char pathname[PATH_MAX]; |
6dc3064a | 5915 | |
2b269489 JR |
5916 | if (!reg->registry->reg.ust->metadata_key) { |
5917 | /* Skip since no metadata is present */ | |
5918 | continue; | |
5919 | } | |
5920 | ||
8c924c7b MD |
5921 | /* Get consumer socket to use to push the metadata.*/ |
5922 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
5923 | usess->consumer); | |
5924 | if (!socket) { | |
9a654598 | 5925 | status = LTTNG_ERR_INVALID; |
8c924c7b MD |
5926 | goto error; |
5927 | } | |
6dc3064a | 5928 | |
8c924c7b | 5929 | memset(pathname, 0, sizeof(pathname)); |
d2956687 JG |
5930 | /* |
5931 | * DEFAULT_UST_TRACE_UID_PATH already contains a path | |
5932 | * separator. | |
5933 | */ | |
8c924c7b | 5934 | ret = snprintf(pathname, sizeof(pathname), |
d2956687 | 5935 | DEFAULT_UST_TRACE_DIR DEFAULT_UST_TRACE_UID_PATH, |
8c924c7b MD |
5936 | reg->uid, reg->bits_per_long); |
5937 | if (ret < 0) { | |
5938 | PERROR("snprintf snapshot path"); | |
9a654598 | 5939 | status = LTTNG_ERR_INVALID; |
8c924c7b MD |
5940 | goto error; |
5941 | } | |
affce97e JG |
5942 | /* Free path allowed on previous iteration. */ |
5943 | free(trace_path); | |
3b967712 MD |
5944 | trace_path = setup_channel_trace_path(usess->consumer, pathname); |
5945 | if (!trace_path) { | |
5946 | status = LTTNG_ERR_INVALID; | |
5947 | goto error; | |
5948 | } | |
d2956687 | 5949 | /* Add the UST default trace dir to path. */ |
8c924c7b MD |
5950 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
5951 | reg_chan, node.node) { | |
9a654598 | 5952 | status = consumer_snapshot_channel(socket, |
e098433c JG |
5953 | reg_chan->consumer_key, |
5954 | output, 0, usess->uid, | |
3b967712 | 5955 | usess->gid, trace_path, wait, |
d2956687 | 5956 | nb_packets_per_stream); |
9a654598 | 5957 | if (status != LTTNG_OK) { |
8c924c7b MD |
5958 | goto error; |
5959 | } | |
5960 | } | |
9a654598 | 5961 | status = consumer_snapshot_channel(socket, |
68808f4e | 5962 | reg->registry->reg.ust->metadata_key, output, 1, |
3b967712 | 5963 | usess->uid, usess->gid, trace_path, wait, 0); |
9a654598 | 5964 | if (status != LTTNG_OK) { |
8c924c7b MD |
5965 | goto error; |
5966 | } | |
af706bb7 | 5967 | } |
8c924c7b MD |
5968 | break; |
5969 | } | |
5970 | case LTTNG_BUFFER_PER_PID: | |
5971 | { | |
5972 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5973 | struct consumer_socket *socket; | |
5974 | struct lttng_ht_iter chan_iter; | |
5975 | struct ust_app_channel *ua_chan; | |
5976 | struct ust_app_session *ua_sess; | |
5977 | struct ust_registry_session *registry; | |
3b967712 | 5978 | char pathname[PATH_MAX]; |
8c924c7b MD |
5979 | |
5980 | ua_sess = lookup_session_by_app(usess, app); | |
5981 | if (!ua_sess) { | |
5982 | /* Session not associated with this app. */ | |
5983 | continue; | |
5984 | } | |
af706bb7 | 5985 | |
8c924c7b MD |
5986 | /* Get the right consumer socket for the application. */ |
5987 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
348a81dc | 5988 | output); |
8c924c7b | 5989 | if (!socket) { |
9a654598 | 5990 | status = LTTNG_ERR_INVALID; |
5c786ded JD |
5991 | goto error; |
5992 | } | |
5993 | ||
8c924c7b MD |
5994 | /* Add the UST default trace dir to path. */ |
5995 | memset(pathname, 0, sizeof(pathname)); | |
d2956687 | 5996 | ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "%s", |
8c924c7b | 5997 | ua_sess->path); |
6dc3064a | 5998 | if (ret < 0) { |
9a654598 | 5999 | status = LTTNG_ERR_INVALID; |
8c924c7b | 6000 | PERROR("snprintf snapshot path"); |
6dc3064a DG |
6001 | goto error; |
6002 | } | |
affce97e JG |
6003 | /* Free path allowed on previous iteration. */ |
6004 | free(trace_path); | |
3b967712 MD |
6005 | trace_path = setup_channel_trace_path(usess->consumer, pathname); |
6006 | if (!trace_path) { | |
6007 | status = LTTNG_ERR_INVALID; | |
6008 | goto error; | |
6009 | } | |
d2956687 | 6010 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, |
8c924c7b | 6011 | ua_chan, node.node) { |
9a654598 | 6012 | status = consumer_snapshot_channel(socket, |
470cc211 JG |
6013 | ua_chan->key, output, 0, |
6014 | ua_sess->effective_credentials | |
6015 | .uid, | |
6016 | ua_sess->effective_credentials | |
6017 | .gid, | |
3b967712 | 6018 | trace_path, wait, |
d2956687 | 6019 | nb_packets_per_stream); |
9a654598 JG |
6020 | switch (status) { |
6021 | case LTTNG_OK: | |
6022 | break; | |
6023 | case LTTNG_ERR_CHAN_NOT_FOUND: | |
6024 | continue; | |
6025 | default: | |
8c924c7b MD |
6026 | goto error; |
6027 | } | |
6028 | } | |
6029 | ||
6030 | registry = get_session_registry(ua_sess); | |
fad1ed2f | 6031 | if (!registry) { |
9bbfb88c MD |
6032 | DBG("Application session is being torn down. Skip application."); |
6033 | continue; | |
fad1ed2f | 6034 | } |
9a654598 | 6035 | status = consumer_snapshot_channel(socket, |
470cc211 JG |
6036 | registry->metadata_key, output, 1, |
6037 | ua_sess->effective_credentials.uid, | |
6038 | ua_sess->effective_credentials.gid, | |
3b967712 | 6039 | trace_path, wait, 0); |
9a654598 JG |
6040 | switch (status) { |
6041 | case LTTNG_OK: | |
6042 | break; | |
6043 | case LTTNG_ERR_CHAN_NOT_FOUND: | |
6044 | continue; | |
6045 | default: | |
8c924c7b MD |
6046 | goto error; |
6047 | } | |
6048 | } | |
6049 | break; | |
6050 | } | |
6051 | default: | |
6052 | assert(0); | |
6053 | break; | |
6dc3064a DG |
6054 | } |
6055 | ||
6056 | error: | |
affce97e | 6057 | free(trace_path); |
6dc3064a | 6058 | rcu_read_unlock(); |
9a654598 | 6059 | return status; |
6dc3064a | 6060 | } |
5c786ded JD |
6061 | |
6062 | /* | |
d07ceecd | 6063 | * Return the size taken by one more packet per stream. |
5c786ded | 6064 | */ |
fb9a95c4 JG |
6065 | uint64_t ust_app_get_size_one_more_packet_per_stream( |
6066 | const struct ltt_ust_session *usess, uint64_t cur_nr_packets) | |
5c786ded | 6067 | { |
d07ceecd | 6068 | uint64_t tot_size = 0; |
5c786ded JD |
6069 | struct ust_app *app; |
6070 | struct lttng_ht_iter iter; | |
6071 | ||
6072 | assert(usess); | |
6073 | ||
6074 | switch (usess->buffer_type) { | |
6075 | case LTTNG_BUFFER_PER_UID: | |
6076 | { | |
6077 | struct buffer_reg_uid *reg; | |
6078 | ||
6079 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
6080 | struct buffer_reg_channel *reg_chan; | |
6081 | ||
b7064eaa | 6082 | rcu_read_lock(); |
5c786ded JD |
6083 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
6084 | reg_chan, node.node) { | |
d07ceecd MD |
6085 | if (cur_nr_packets >= reg_chan->num_subbuf) { |
6086 | /* | |
6087 | * Don't take channel into account if we | |
6088 | * already grab all its packets. | |
6089 | */ | |
6090 | continue; | |
6091 | } | |
6092 | tot_size += reg_chan->subbuf_size * reg_chan->stream_count; | |
5c786ded | 6093 | } |
b7064eaa | 6094 | rcu_read_unlock(); |
5c786ded JD |
6095 | } |
6096 | break; | |
6097 | } | |
6098 | case LTTNG_BUFFER_PER_PID: | |
6099 | { | |
6100 | rcu_read_lock(); | |
6101 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6102 | struct ust_app_channel *ua_chan; | |
6103 | struct ust_app_session *ua_sess; | |
6104 | struct lttng_ht_iter chan_iter; | |
6105 | ||
6106 | ua_sess = lookup_session_by_app(usess, app); | |
6107 | if (!ua_sess) { | |
6108 | /* Session not associated with this app. */ | |
6109 | continue; | |
6110 | } | |
6111 | ||
6112 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
6113 | ua_chan, node.node) { | |
d07ceecd MD |
6114 | if (cur_nr_packets >= ua_chan->attr.num_subbuf) { |
6115 | /* | |
6116 | * Don't take channel into account if we | |
6117 | * already grab all its packets. | |
6118 | */ | |
6119 | continue; | |
6120 | } | |
6121 | tot_size += ua_chan->attr.subbuf_size * ua_chan->streams.count; | |
5c786ded JD |
6122 | } |
6123 | } | |
6124 | rcu_read_unlock(); | |
6125 | break; | |
6126 | } | |
6127 | default: | |
6128 | assert(0); | |
6129 | break; | |
6130 | } | |
6131 | ||
d07ceecd | 6132 | return tot_size; |
5c786ded | 6133 | } |
fb83fe64 JD |
6134 | |
6135 | int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id, | |
6136 | struct cds_list_head *buffer_reg_uid_list, | |
6137 | struct consumer_output *consumer, uint64_t uchan_id, | |
6138 | int overwrite, uint64_t *discarded, uint64_t *lost) | |
6139 | { | |
6140 | int ret; | |
6141 | uint64_t consumer_chan_key; | |
6142 | ||
70dd8162 MD |
6143 | *discarded = 0; |
6144 | *lost = 0; | |
6145 | ||
fb83fe64 | 6146 | ret = buffer_reg_uid_consumer_channel_key( |
76604852 | 6147 | buffer_reg_uid_list, uchan_id, &consumer_chan_key); |
fb83fe64 | 6148 | if (ret < 0) { |
70dd8162 MD |
6149 | /* Not found */ |
6150 | ret = 0; | |
fb83fe64 JD |
6151 | goto end; |
6152 | } | |
6153 | ||
6154 | if (overwrite) { | |
6155 | ret = consumer_get_lost_packets(ust_session_id, | |
6156 | consumer_chan_key, consumer, lost); | |
6157 | } else { | |
6158 | ret = consumer_get_discarded_events(ust_session_id, | |
6159 | consumer_chan_key, consumer, discarded); | |
6160 | } | |
6161 | ||
6162 | end: | |
6163 | return ret; | |
6164 | } | |
6165 | ||
6166 | int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess, | |
6167 | struct ltt_ust_channel *uchan, | |
6168 | struct consumer_output *consumer, int overwrite, | |
6169 | uint64_t *discarded, uint64_t *lost) | |
6170 | { | |
6171 | int ret = 0; | |
6172 | struct lttng_ht_iter iter; | |
6173 | struct lttng_ht_node_str *ua_chan_node; | |
6174 | struct ust_app *app; | |
6175 | struct ust_app_session *ua_sess; | |
6176 | struct ust_app_channel *ua_chan; | |
6177 | ||
70dd8162 MD |
6178 | *discarded = 0; |
6179 | *lost = 0; | |
6180 | ||
fb83fe64 JD |
6181 | rcu_read_lock(); |
6182 | /* | |
70dd8162 MD |
6183 | * Iterate over every registered applications. Sum counters for |
6184 | * all applications containing requested session and channel. | |
fb83fe64 JD |
6185 | */ |
6186 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6187 | struct lttng_ht_iter uiter; | |
6188 | ||
6189 | ua_sess = lookup_session_by_app(usess, app); | |
6190 | if (ua_sess == NULL) { | |
6191 | continue; | |
6192 | } | |
6193 | ||
6194 | /* Get channel */ | |
ee022399 | 6195 | lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &uiter); |
fb83fe64 JD |
6196 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); |
6197 | /* If the session is found for the app, the channel must be there */ | |
6198 | assert(ua_chan_node); | |
6199 | ||
6200 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
6201 | ||
6202 | if (overwrite) { | |
70dd8162 MD |
6203 | uint64_t _lost; |
6204 | ||
fb83fe64 | 6205 | ret = consumer_get_lost_packets(usess->id, ua_chan->key, |
70dd8162 MD |
6206 | consumer, &_lost); |
6207 | if (ret < 0) { | |
6208 | break; | |
6209 | } | |
6210 | (*lost) += _lost; | |
fb83fe64 | 6211 | } else { |
70dd8162 MD |
6212 | uint64_t _discarded; |
6213 | ||
fb83fe64 | 6214 | ret = consumer_get_discarded_events(usess->id, |
70dd8162 MD |
6215 | ua_chan->key, consumer, &_discarded); |
6216 | if (ret < 0) { | |
6217 | break; | |
6218 | } | |
6219 | (*discarded) += _discarded; | |
fb83fe64 | 6220 | } |
fb83fe64 JD |
6221 | } |
6222 | ||
fb83fe64 JD |
6223 | rcu_read_unlock(); |
6224 | return ret; | |
6225 | } | |
c2561365 JD |
6226 | |
6227 | static | |
6228 | int ust_app_regenerate_statedump(struct ltt_ust_session *usess, | |
6229 | struct ust_app *app) | |
6230 | { | |
6231 | int ret = 0; | |
6232 | struct ust_app_session *ua_sess; | |
6233 | ||
6234 | DBG("Regenerating the metadata for ust app pid %d", app->pid); | |
6235 | ||
6236 | rcu_read_lock(); | |
6237 | ||
6238 | ua_sess = lookup_session_by_app(usess, app); | |
6239 | if (ua_sess == NULL) { | |
6240 | /* The session is in teardown process. Ignore and continue. */ | |
6241 | goto end; | |
6242 | } | |
6243 | ||
6244 | pthread_mutex_lock(&ua_sess->lock); | |
6245 | ||
6246 | if (ua_sess->deleted) { | |
6247 | goto end_unlock; | |
6248 | } | |
6249 | ||
6250 | pthread_mutex_lock(&app->sock_lock); | |
6251 | ret = ustctl_regenerate_statedump(app->sock, ua_sess->handle); | |
6252 | pthread_mutex_unlock(&app->sock_lock); | |
6253 | ||
6254 | end_unlock: | |
6255 | pthread_mutex_unlock(&ua_sess->lock); | |
6256 | ||
6257 | end: | |
6258 | rcu_read_unlock(); | |
6259 | health_code_update(); | |
6260 | return ret; | |
6261 | } | |
6262 | ||
6263 | /* | |
6264 | * Regenerate the statedump for each app in the session. | |
6265 | */ | |
6266 | int ust_app_regenerate_statedump_all(struct ltt_ust_session *usess) | |
6267 | { | |
6268 | int ret = 0; | |
6269 | struct lttng_ht_iter iter; | |
6270 | struct ust_app *app; | |
6271 | ||
6272 | DBG("Regenerating the metadata for all UST apps"); | |
6273 | ||
6274 | rcu_read_lock(); | |
6275 | ||
6276 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6277 | if (!app->compatible) { | |
6278 | continue; | |
6279 | } | |
6280 | ||
6281 | ret = ust_app_regenerate_statedump(usess, app); | |
6282 | if (ret < 0) { | |
6283 | /* Continue to the next app even on error */ | |
6284 | continue; | |
6285 | } | |
6286 | } | |
6287 | ||
6288 | rcu_read_unlock(); | |
6289 | ||
6290 | return 0; | |
6291 | } | |
5c408ad8 JD |
6292 | |
6293 | /* | |
6294 | * Rotate all the channels of a session. | |
6295 | * | |
6f6d3b69 | 6296 | * Return LTTNG_OK on success or else an LTTng error code. |
5c408ad8 | 6297 | */ |
6f6d3b69 | 6298 | enum lttng_error_code ust_app_rotate_session(struct ltt_session *session) |
5c408ad8 | 6299 | { |
6f6d3b69 MD |
6300 | int ret; |
6301 | enum lttng_error_code cmd_ret = LTTNG_OK; | |
5c408ad8 JD |
6302 | struct lttng_ht_iter iter; |
6303 | struct ust_app *app; | |
6304 | struct ltt_ust_session *usess = session->ust_session; | |
5c408ad8 JD |
6305 | |
6306 | assert(usess); | |
6307 | ||
6308 | rcu_read_lock(); | |
6309 | ||
6310 | switch (usess->buffer_type) { | |
6311 | case LTTNG_BUFFER_PER_UID: | |
6312 | { | |
6313 | struct buffer_reg_uid *reg; | |
6314 | ||
6315 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
6316 | struct buffer_reg_channel *reg_chan; | |
6317 | struct consumer_socket *socket; | |
6318 | ||
6319 | /* Get consumer socket to use to push the metadata.*/ | |
6320 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
6321 | usess->consumer); | |
6322 | if (!socket) { | |
6f6d3b69 | 6323 | cmd_ret = LTTNG_ERR_INVALID; |
5c408ad8 JD |
6324 | goto error; |
6325 | } | |
6326 | ||
5c408ad8 JD |
6327 | /* Rotate the data channels. */ |
6328 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
6329 | reg_chan, node.node) { | |
5c408ad8 JD |
6330 | ret = consumer_rotate_channel(socket, |
6331 | reg_chan->consumer_key, | |
6332 | usess->uid, usess->gid, | |
d2956687 JG |
6333 | usess->consumer, |
6334 | /* is_metadata_channel */ false); | |
5c408ad8 | 6335 | if (ret < 0) { |
6f6d3b69 | 6336 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
6337 | goto error; |
6338 | } | |
6339 | } | |
6340 | ||
6341 | (void) push_metadata(reg->registry->reg.ust, usess->consumer); | |
6342 | ||
6343 | ret = consumer_rotate_channel(socket, | |
6344 | reg->registry->reg.ust->metadata_key, | |
6345 | usess->uid, usess->gid, | |
d2956687 JG |
6346 | usess->consumer, |
6347 | /* is_metadata_channel */ true); | |
5c408ad8 | 6348 | if (ret < 0) { |
6f6d3b69 | 6349 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
6350 | goto error; |
6351 | } | |
5c408ad8 JD |
6352 | } |
6353 | break; | |
6354 | } | |
6355 | case LTTNG_BUFFER_PER_PID: | |
6356 | { | |
6357 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6358 | struct consumer_socket *socket; | |
6359 | struct lttng_ht_iter chan_iter; | |
6360 | struct ust_app_channel *ua_chan; | |
6361 | struct ust_app_session *ua_sess; | |
6362 | struct ust_registry_session *registry; | |
6363 | ||
6364 | ua_sess = lookup_session_by_app(usess, app); | |
6365 | if (!ua_sess) { | |
6366 | /* Session not associated with this app. */ | |
6367 | continue; | |
6368 | } | |
5c408ad8 JD |
6369 | |
6370 | /* Get the right consumer socket for the application. */ | |
6371 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
6372 | usess->consumer); | |
6373 | if (!socket) { | |
6f6d3b69 | 6374 | cmd_ret = LTTNG_ERR_INVALID; |
5c408ad8 JD |
6375 | goto error; |
6376 | } | |
6377 | ||
6378 | registry = get_session_registry(ua_sess); | |
6379 | if (!registry) { | |
6f6d3b69 MD |
6380 | DBG("Application session is being torn down. Skip application."); |
6381 | continue; | |
5c408ad8 JD |
6382 | } |
6383 | ||
5c408ad8 JD |
6384 | /* Rotate the data channels. */ |
6385 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
6386 | ua_chan, node.node) { | |
470cc211 JG |
6387 | ret = consumer_rotate_channel(socket, |
6388 | ua_chan->key, | |
6389 | ua_sess->effective_credentials | |
6390 | .uid, | |
6391 | ua_sess->effective_credentials | |
6392 | .gid, | |
d2956687 JG |
6393 | ua_sess->consumer, |
6394 | /* is_metadata_channel */ false); | |
5c408ad8 | 6395 | if (ret < 0) { |
6f6d3b69 MD |
6396 | /* Per-PID buffer and application going away. */ |
6397 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) | |
6398 | continue; | |
6399 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; | |
5c408ad8 JD |
6400 | goto error; |
6401 | } | |
6402 | } | |
6403 | ||
6404 | /* Rotate the metadata channel. */ | |
6405 | (void) push_metadata(registry, usess->consumer); | |
470cc211 JG |
6406 | ret = consumer_rotate_channel(socket, |
6407 | registry->metadata_key, | |
6408 | ua_sess->effective_credentials.uid, | |
6409 | ua_sess->effective_credentials.gid, | |
d2956687 JG |
6410 | ua_sess->consumer, |
6411 | /* is_metadata_channel */ true); | |
5c408ad8 | 6412 | if (ret < 0) { |
6f6d3b69 MD |
6413 | /* Per-PID buffer and application going away. */ |
6414 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) | |
6415 | continue; | |
6416 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; | |
5c408ad8 JD |
6417 | goto error; |
6418 | } | |
5c408ad8 JD |
6419 | } |
6420 | break; | |
6421 | } | |
6422 | default: | |
6423 | assert(0); | |
6424 | break; | |
6425 | } | |
6426 | ||
6f6d3b69 | 6427 | cmd_ret = LTTNG_OK; |
5c408ad8 JD |
6428 | |
6429 | error: | |
6430 | rcu_read_unlock(); | |
6f6d3b69 | 6431 | return cmd_ret; |
5c408ad8 | 6432 | } |
d2956687 JG |
6433 | |
6434 | enum lttng_error_code ust_app_create_channel_subdirectories( | |
6435 | const struct ltt_ust_session *usess) | |
6436 | { | |
6437 | enum lttng_error_code ret = LTTNG_OK; | |
6438 | struct lttng_ht_iter iter; | |
6439 | enum lttng_trace_chunk_status chunk_status; | |
6440 | char *pathname_index; | |
6441 | int fmt_ret; | |
6442 | ||
6443 | assert(usess->current_trace_chunk); | |
6444 | rcu_read_lock(); | |
6445 | ||
6446 | switch (usess->buffer_type) { | |
6447 | case LTTNG_BUFFER_PER_UID: | |
6448 | { | |
6449 | struct buffer_reg_uid *reg; | |
6450 | ||
6451 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
6452 | fmt_ret = asprintf(&pathname_index, | |
6453 | DEFAULT_UST_TRACE_DIR DEFAULT_UST_TRACE_UID_PATH "/" DEFAULT_INDEX_DIR, | |
6454 | reg->uid, reg->bits_per_long); | |
6455 | if (fmt_ret < 0) { | |
6456 | ERR("Failed to format channel index directory"); | |
6457 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
6458 | goto error; | |
6459 | } | |
6460 | ||
6461 | /* | |
6462 | * Create the index subdirectory which will take care | |
6463 | * of implicitly creating the channel's path. | |
6464 | */ | |
6465 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
6466 | usess->current_trace_chunk, | |
6467 | pathname_index); | |
6468 | free(pathname_index); | |
6469 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
6470 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
6471 | goto error; | |
6472 | } | |
6473 | } | |
6474 | break; | |
6475 | } | |
6476 | case LTTNG_BUFFER_PER_PID: | |
6477 | { | |
6478 | struct ust_app *app; | |
6479 | ||
6480 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, | |
6481 | pid_n.node) { | |
6482 | struct ust_app_session *ua_sess; | |
6483 | struct ust_registry_session *registry; | |
6484 | ||
6485 | ua_sess = lookup_session_by_app(usess, app); | |
6486 | if (!ua_sess) { | |
6487 | /* Session not associated with this app. */ | |
6488 | continue; | |
6489 | } | |
6490 | ||
6491 | registry = get_session_registry(ua_sess); | |
6492 | if (!registry) { | |
6493 | DBG("Application session is being torn down. Skip application."); | |
6494 | continue; | |
6495 | } | |
6496 | ||
6497 | fmt_ret = asprintf(&pathname_index, | |
6498 | DEFAULT_UST_TRACE_DIR "%s/" DEFAULT_INDEX_DIR, | |
6499 | ua_sess->path); | |
6500 | if (fmt_ret < 0) { | |
6501 | ERR("Failed to format channel index directory"); | |
6502 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
6503 | goto error; | |
6504 | } | |
6505 | /* | |
6506 | * Create the index subdirectory which will take care | |
6507 | * of implicitly creating the channel's path. | |
6508 | */ | |
6509 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
6510 | usess->current_trace_chunk, | |
6511 | pathname_index); | |
6512 | free(pathname_index); | |
6513 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
6514 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
6515 | goto error; | |
6516 | } | |
6517 | } | |
6518 | break; | |
6519 | } | |
6520 | default: | |
6521 | abort(); | |
6522 | } | |
6523 | ||
6524 | ret = LTTNG_OK; | |
6525 | error: | |
6526 | rcu_read_unlock(); | |
6527 | return ret; | |
6528 | } |