Commit | Line | Data |
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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( | |
253 | ua_sess->tracing_id, ua_sess->bits_per_long, ua_sess->uid); | |
254 | if (!reg_uid) { | |
255 | goto error; | |
256 | } | |
257 | registry = reg_uid->registry->reg.ust; | |
258 | break; | |
259 | } | |
260 | default: | |
261 | assert(0); | |
262 | }; | |
263 | ||
264 | error: | |
265 | return registry; | |
266 | } | |
267 | ||
55cc08a6 DG |
268 | /* |
269 | * Delete ust context safely. RCU read lock must be held before calling | |
270 | * this function. | |
271 | */ | |
272 | static | |
fb45065e MD |
273 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx, |
274 | struct ust_app *app) | |
55cc08a6 | 275 | { |
ffe60014 DG |
276 | int ret; |
277 | ||
278 | assert(ua_ctx); | |
279 | ||
55cc08a6 | 280 | if (ua_ctx->obj) { |
fb45065e | 281 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 282 | ret = ustctl_release_object(sock, ua_ctx->obj); |
fb45065e | 283 | pthread_mutex_unlock(&app->sock_lock); |
d0b96690 DG |
284 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
285 | ERR("UST app sock %d release ctx obj handle %d failed with ret %d", | |
286 | sock, ua_ctx->obj->handle, ret); | |
ffe60014 | 287 | } |
55cc08a6 DG |
288 | free(ua_ctx->obj); |
289 | } | |
290 | free(ua_ctx); | |
291 | } | |
292 | ||
d80a6244 DG |
293 | /* |
294 | * Delete ust app event safely. RCU read lock must be held before calling | |
295 | * this function. | |
296 | */ | |
8b366481 | 297 | static |
fb45065e MD |
298 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event, |
299 | struct ust_app *app) | |
d80a6244 | 300 | { |
ffe60014 DG |
301 | int ret; |
302 | ||
303 | assert(ua_event); | |
304 | ||
53a80697 | 305 | free(ua_event->filter); |
951f0b71 JI |
306 | if (ua_event->exclusion != NULL) |
307 | free(ua_event->exclusion); | |
edb67388 | 308 | if (ua_event->obj != NULL) { |
fb45065e | 309 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 310 | ret = ustctl_release_object(sock, ua_event->obj); |
fb45065e | 311 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
312 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
313 | ERR("UST app sock %d release event obj failed with ret %d", | |
314 | sock, ret); | |
315 | } | |
edb67388 DG |
316 | free(ua_event->obj); |
317 | } | |
d80a6244 DG |
318 | free(ua_event); |
319 | } | |
320 | ||
321 | /* | |
7972aab2 DG |
322 | * Release ust data object of the given stream. |
323 | * | |
324 | * Return 0 on success or else a negative value. | |
d80a6244 | 325 | */ |
fb45065e MD |
326 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream, |
327 | struct ust_app *app) | |
d80a6244 | 328 | { |
7972aab2 | 329 | int ret = 0; |
ffe60014 DG |
330 | |
331 | assert(stream); | |
332 | ||
8b366481 | 333 | if (stream->obj) { |
fb45065e | 334 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 335 | ret = ustctl_release_object(sock, stream->obj); |
fb45065e | 336 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
337 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
338 | ERR("UST app sock %d release stream obj failed with ret %d", | |
339 | sock, ret); | |
340 | } | |
4063050c | 341 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
342 | free(stream->obj); |
343 | } | |
7972aab2 DG |
344 | |
345 | return ret; | |
346 | } | |
347 | ||
348 | /* | |
349 | * Delete ust app stream safely. RCU read lock must be held before calling | |
350 | * this function. | |
351 | */ | |
352 | static | |
fb45065e MD |
353 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream, |
354 | struct ust_app *app) | |
7972aab2 DG |
355 | { |
356 | assert(stream); | |
357 | ||
fb45065e | 358 | (void) release_ust_app_stream(sock, stream, app); |
84cd17c6 | 359 | free(stream); |
d80a6244 DG |
360 | } |
361 | ||
36b588ed MD |
362 | /* |
363 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
364 | * section and outside of call_rcu thread, so we postpone its execution |
365 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
366 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
367 | */ |
368 | static | |
369 | void delete_ust_app_channel_rcu(struct rcu_head *head) | |
370 | { | |
371 | struct ust_app_channel *ua_chan = | |
372 | caa_container_of(head, struct ust_app_channel, rcu_head); | |
373 | ||
0b2dc8df MD |
374 | ht_cleanup_push(ua_chan->ctx); |
375 | ht_cleanup_push(ua_chan->events); | |
36b588ed MD |
376 | free(ua_chan); |
377 | } | |
378 | ||
fb83fe64 JD |
379 | /* |
380 | * Extract the lost packet or discarded events counter when the channel is | |
381 | * being deleted and store the value in the parent channel so we can | |
382 | * access it from lttng list and at stop/destroy. | |
82cac6d2 JG |
383 | * |
384 | * The session list lock must be held by the caller. | |
fb83fe64 JD |
385 | */ |
386 | static | |
387 | void save_per_pid_lost_discarded_counters(struct ust_app_channel *ua_chan) | |
388 | { | |
389 | uint64_t discarded = 0, lost = 0; | |
390 | struct ltt_session *session; | |
391 | struct ltt_ust_channel *uchan; | |
392 | ||
393 | if (ua_chan->attr.type != LTTNG_UST_CHAN_PER_CPU) { | |
394 | return; | |
395 | } | |
396 | ||
397 | rcu_read_lock(); | |
398 | session = session_find_by_id(ua_chan->session->tracing_id); | |
d68ec974 JG |
399 | if (!session || !session->ust_session) { |
400 | /* | |
401 | * Not finding the session is not an error because there are | |
402 | * multiple ways the channels can be torn down. | |
403 | * | |
404 | * 1) The session daemon can initiate the destruction of the | |
405 | * ust app session after receiving a destroy command or | |
406 | * during its shutdown/teardown. | |
407 | * 2) The application, since we are in per-pid tracing, is | |
408 | * unregistering and tearing down its ust app session. | |
409 | * | |
410 | * Both paths are protected by the session list lock which | |
411 | * ensures that the accounting of lost packets and discarded | |
412 | * events is done exactly once. The session is then unpublished | |
413 | * from the session list, resulting in this condition. | |
414 | */ | |
fb83fe64 JD |
415 | goto end; |
416 | } | |
417 | ||
418 | if (ua_chan->attr.overwrite) { | |
419 | consumer_get_lost_packets(ua_chan->session->tracing_id, | |
420 | ua_chan->key, session->ust_session->consumer, | |
421 | &lost); | |
422 | } else { | |
423 | consumer_get_discarded_events(ua_chan->session->tracing_id, | |
424 | ua_chan->key, session->ust_session->consumer, | |
425 | &discarded); | |
426 | } | |
427 | uchan = trace_ust_find_channel_by_name( | |
428 | session->ust_session->domain_global.channels, | |
429 | ua_chan->name); | |
430 | if (!uchan) { | |
431 | ERR("Missing UST channel to store discarded counters"); | |
432 | goto end; | |
433 | } | |
434 | ||
435 | uchan->per_pid_closed_app_discarded += discarded; | |
436 | uchan->per_pid_closed_app_lost += lost; | |
437 | ||
438 | end: | |
439 | rcu_read_unlock(); | |
e32d7f27 JG |
440 | if (session) { |
441 | session_put(session); | |
442 | } | |
fb83fe64 JD |
443 | } |
444 | ||
d80a6244 DG |
445 | /* |
446 | * Delete ust app channel safely. RCU read lock must be held before calling | |
447 | * this function. | |
82cac6d2 JG |
448 | * |
449 | * The session list lock must be held by the caller. | |
d80a6244 | 450 | */ |
8b366481 | 451 | static |
d0b96690 DG |
452 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
453 | struct ust_app *app) | |
d80a6244 DG |
454 | { |
455 | int ret; | |
bec39940 | 456 | struct lttng_ht_iter iter; |
d80a6244 | 457 | struct ust_app_event *ua_event; |
55cc08a6 | 458 | struct ust_app_ctx *ua_ctx; |
030a66fa | 459 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 460 | struct ust_registry_session *registry; |
d80a6244 | 461 | |
ffe60014 DG |
462 | assert(ua_chan); |
463 | ||
464 | DBG3("UST app deleting channel %s", ua_chan->name); | |
465 | ||
55cc08a6 | 466 | /* Wipe stream */ |
d80a6244 | 467 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 468 | cds_list_del(&stream->list); |
fb45065e | 469 | delete_ust_app_stream(sock, stream, app); |
d80a6244 DG |
470 | } |
471 | ||
55cc08a6 | 472 | /* Wipe context */ |
bec39940 | 473 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
31746f93 | 474 | cds_list_del(&ua_ctx->list); |
bec39940 | 475 | ret = lttng_ht_del(ua_chan->ctx, &iter); |
55cc08a6 | 476 | assert(!ret); |
fb45065e | 477 | delete_ust_app_ctx(sock, ua_ctx, app); |
55cc08a6 | 478 | } |
d80a6244 | 479 | |
55cc08a6 | 480 | /* Wipe events */ |
bec39940 DG |
481 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
482 | node.node) { | |
483 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 484 | assert(!ret); |
fb45065e | 485 | delete_ust_app_event(sock, ua_event, app); |
d80a6244 | 486 | } |
edb67388 | 487 | |
c8335706 MD |
488 | if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) { |
489 | /* Wipe and free registry from session registry. */ | |
490 | registry = get_session_registry(ua_chan->session); | |
491 | if (registry) { | |
e9404c27 | 492 | ust_registry_channel_del_free(registry, ua_chan->key, |
e38d96f9 MD |
493 | sock >= 0); |
494 | } | |
45798a31 JG |
495 | /* |
496 | * A negative socket can be used by the caller when | |
497 | * cleaning-up a ua_chan in an error path. Skip the | |
498 | * accounting in this case. | |
499 | */ | |
e38d96f9 MD |
500 | if (sock >= 0) { |
501 | save_per_pid_lost_discarded_counters(ua_chan); | |
c8335706 | 502 | } |
7972aab2 | 503 | } |
d0b96690 | 504 | |
edb67388 | 505 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
506 | /* Remove channel from application UST object descriptor. */ |
507 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
c6e62271 DG |
508 | ret = lttng_ht_del(app->ust_objd, &iter); |
509 | assert(!ret); | |
fb45065e | 510 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 511 | ret = ustctl_release_object(sock, ua_chan->obj); |
fb45065e | 512 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
513 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
514 | ERR("UST app sock %d release channel obj failed with ret %d", | |
515 | sock, ret); | |
516 | } | |
7972aab2 | 517 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
518 | free(ua_chan->obj); |
519 | } | |
36b588ed | 520 | call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); |
d80a6244 DG |
521 | } |
522 | ||
fb45065e MD |
523 | int ust_app_register_done(struct ust_app *app) |
524 | { | |
525 | int ret; | |
526 | ||
527 | pthread_mutex_lock(&app->sock_lock); | |
528 | ret = ustctl_register_done(app->sock); | |
529 | pthread_mutex_unlock(&app->sock_lock); | |
530 | return ret; | |
531 | } | |
532 | ||
533 | int ust_app_release_object(struct ust_app *app, struct lttng_ust_object_data *data) | |
534 | { | |
535 | int ret, sock; | |
536 | ||
537 | if (app) { | |
538 | pthread_mutex_lock(&app->sock_lock); | |
539 | sock = app->sock; | |
540 | } else { | |
541 | sock = -1; | |
542 | } | |
543 | ret = ustctl_release_object(sock, data); | |
544 | if (app) { | |
545 | pthread_mutex_unlock(&app->sock_lock); | |
546 | } | |
547 | return ret; | |
548 | } | |
549 | ||
331744e3 | 550 | /* |
1b532a60 DG |
551 | * Push metadata to consumer socket. |
552 | * | |
dc2bbdae MD |
553 | * RCU read-side lock must be held to guarantee existance of socket. |
554 | * Must be called with the ust app session lock held. | |
555 | * Must be called with the registry lock held. | |
331744e3 JD |
556 | * |
557 | * On success, return the len of metadata pushed or else a negative value. | |
2c57e06d MD |
558 | * Returning a -EPIPE return value means we could not send the metadata, |
559 | * but it can be caused by recoverable errors (e.g. the application has | |
560 | * terminated concurrently). | |
331744e3 JD |
561 | */ |
562 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
563 | struct consumer_socket *socket, int send_zero_data) | |
564 | { | |
565 | int ret; | |
566 | char *metadata_str = NULL; | |
c585821b | 567 | size_t len, offset, new_metadata_len_sent; |
331744e3 | 568 | ssize_t ret_val; |
93ec662e | 569 | uint64_t metadata_key, metadata_version; |
331744e3 JD |
570 | |
571 | assert(registry); | |
572 | assert(socket); | |
1b532a60 | 573 | |
c585821b MD |
574 | metadata_key = registry->metadata_key; |
575 | ||
ce34fcd0 | 576 | /* |
dc2bbdae MD |
577 | * Means that no metadata was assigned to the session. This can |
578 | * happens if no start has been done previously. | |
ce34fcd0 | 579 | */ |
c585821b | 580 | if (!metadata_key) { |
ce34fcd0 MD |
581 | return 0; |
582 | } | |
583 | ||
331744e3 JD |
584 | offset = registry->metadata_len_sent; |
585 | len = registry->metadata_len - registry->metadata_len_sent; | |
c585821b | 586 | new_metadata_len_sent = registry->metadata_len; |
93ec662e | 587 | metadata_version = registry->metadata_version; |
331744e3 JD |
588 | if (len == 0) { |
589 | DBG3("No metadata to push for metadata key %" PRIu64, | |
590 | registry->metadata_key); | |
591 | ret_val = len; | |
592 | if (send_zero_data) { | |
593 | DBG("No metadata to push"); | |
594 | goto push_data; | |
595 | } | |
596 | goto end; | |
597 | } | |
598 | ||
599 | /* Allocate only what we have to send. */ | |
600 | metadata_str = zmalloc(len); | |
601 | if (!metadata_str) { | |
602 | PERROR("zmalloc ust app metadata string"); | |
603 | ret_val = -ENOMEM; | |
604 | goto error; | |
605 | } | |
c585821b | 606 | /* Copy what we haven't sent out. */ |
331744e3 | 607 | memcpy(metadata_str, registry->metadata + offset, len); |
331744e3 JD |
608 | |
609 | push_data: | |
c585821b MD |
610 | pthread_mutex_unlock(®istry->lock); |
611 | /* | |
612 | * We need to unlock the registry while we push metadata to | |
613 | * break a circular dependency between the consumerd metadata | |
614 | * lock and the sessiond registry lock. Indeed, pushing metadata | |
615 | * to the consumerd awaits that it gets pushed all the way to | |
616 | * relayd, but doing so requires grabbing the metadata lock. If | |
617 | * a concurrent metadata request is being performed by | |
618 | * consumerd, this can try to grab the registry lock on the | |
619 | * sessiond while holding the metadata lock on the consumer | |
620 | * daemon. Those push and pull schemes are performed on two | |
621 | * different bidirectionnal communication sockets. | |
622 | */ | |
623 | ret = consumer_push_metadata(socket, metadata_key, | |
93ec662e | 624 | metadata_str, len, offset, metadata_version); |
c585821b | 625 | pthread_mutex_lock(®istry->lock); |
331744e3 | 626 | if (ret < 0) { |
000baf6a | 627 | /* |
dc2bbdae MD |
628 | * There is an acceptable race here between the registry |
629 | * metadata key assignment and the creation on the | |
630 | * consumer. The session daemon can concurrently push | |
631 | * metadata for this registry while being created on the | |
632 | * consumer since the metadata key of the registry is | |
633 | * assigned *before* it is setup to avoid the consumer | |
634 | * to ask for metadata that could possibly be not found | |
635 | * in the session daemon. | |
000baf6a | 636 | * |
dc2bbdae MD |
637 | * The metadata will get pushed either by the session |
638 | * being stopped or the consumer requesting metadata if | |
639 | * that race is triggered. | |
000baf6a DG |
640 | */ |
641 | if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) { | |
642 | ret = 0; | |
c585821b MD |
643 | } else { |
644 | ERR("Error pushing metadata to consumer"); | |
000baf6a | 645 | } |
331744e3 JD |
646 | ret_val = ret; |
647 | goto error_push; | |
c585821b MD |
648 | } else { |
649 | /* | |
650 | * Metadata may have been concurrently pushed, since | |
651 | * we're not holding the registry lock while pushing to | |
652 | * consumer. This is handled by the fact that we send | |
653 | * the metadata content, size, and the offset at which | |
654 | * that metadata belongs. This may arrive out of order | |
655 | * on the consumer side, and the consumer is able to | |
656 | * deal with overlapping fragments. The consumer | |
657 | * supports overlapping fragments, which must be | |
658 | * contiguous starting from offset 0. We keep the | |
659 | * largest metadata_len_sent value of the concurrent | |
660 | * send. | |
661 | */ | |
662 | registry->metadata_len_sent = | |
663 | max_t(size_t, registry->metadata_len_sent, | |
664 | new_metadata_len_sent); | |
331744e3 | 665 | } |
331744e3 JD |
666 | free(metadata_str); |
667 | return len; | |
668 | ||
669 | end: | |
670 | error: | |
ce34fcd0 MD |
671 | if (ret_val) { |
672 | /* | |
dc2bbdae MD |
673 | * On error, flag the registry that the metadata is |
674 | * closed. We were unable to push anything and this | |
675 | * means that either the consumer is not responding or | |
676 | * the metadata cache has been destroyed on the | |
677 | * consumer. | |
ce34fcd0 MD |
678 | */ |
679 | registry->metadata_closed = 1; | |
680 | } | |
331744e3 JD |
681 | error_push: |
682 | free(metadata_str); | |
683 | return ret_val; | |
684 | } | |
685 | ||
d88aee68 | 686 | /* |
ce34fcd0 | 687 | * For a given application and session, push metadata to consumer. |
331744e3 JD |
688 | * Either sock or consumer is required : if sock is NULL, the default |
689 | * socket to send the metadata is retrieved from consumer, if sock | |
690 | * is not NULL we use it to send the metadata. | |
ce34fcd0 | 691 | * RCU read-side lock must be held while calling this function, |
dc2bbdae MD |
692 | * therefore ensuring existance of registry. It also ensures existance |
693 | * of socket throughout this function. | |
d88aee68 DG |
694 | * |
695 | * Return 0 on success else a negative error. | |
2c57e06d MD |
696 | * Returning a -EPIPE return value means we could not send the metadata, |
697 | * but it can be caused by recoverable errors (e.g. the application has | |
698 | * terminated concurrently). | |
d88aee68 | 699 | */ |
7972aab2 DG |
700 | static int push_metadata(struct ust_registry_session *registry, |
701 | struct consumer_output *consumer) | |
d88aee68 | 702 | { |
331744e3 JD |
703 | int ret_val; |
704 | ssize_t ret; | |
d88aee68 DG |
705 | struct consumer_socket *socket; |
706 | ||
7972aab2 DG |
707 | assert(registry); |
708 | assert(consumer); | |
709 | ||
ce34fcd0 | 710 | pthread_mutex_lock(®istry->lock); |
ce34fcd0 | 711 | if (registry->metadata_closed) { |
dc2bbdae MD |
712 | ret_val = -EPIPE; |
713 | goto error; | |
d88aee68 DG |
714 | } |
715 | ||
d88aee68 | 716 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
717 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
718 | consumer); | |
d88aee68 | 719 | if (!socket) { |
331744e3 | 720 | ret_val = -1; |
ce34fcd0 | 721 | goto error; |
d88aee68 DG |
722 | } |
723 | ||
331744e3 | 724 | ret = ust_app_push_metadata(registry, socket, 0); |
d88aee68 | 725 | if (ret < 0) { |
331744e3 | 726 | ret_val = ret; |
ce34fcd0 | 727 | goto error; |
d88aee68 | 728 | } |
dc2bbdae | 729 | pthread_mutex_unlock(®istry->lock); |
d88aee68 DG |
730 | return 0; |
731 | ||
ce34fcd0 | 732 | error: |
dc2bbdae | 733 | pthread_mutex_unlock(®istry->lock); |
331744e3 | 734 | return ret_val; |
d88aee68 DG |
735 | } |
736 | ||
737 | /* | |
738 | * Send to the consumer a close metadata command for the given session. Once | |
739 | * done, the metadata channel is deleted and the session metadata pointer is | |
dc2bbdae | 740 | * nullified. The session lock MUST be held unless the application is |
d88aee68 DG |
741 | * in the destroy path. |
742 | * | |
743 | * Return 0 on success else a negative value. | |
744 | */ | |
7972aab2 DG |
745 | static int close_metadata(struct ust_registry_session *registry, |
746 | struct consumer_output *consumer) | |
d88aee68 DG |
747 | { |
748 | int ret; | |
749 | struct consumer_socket *socket; | |
750 | ||
7972aab2 DG |
751 | assert(registry); |
752 | assert(consumer); | |
d88aee68 | 753 | |
7972aab2 DG |
754 | rcu_read_lock(); |
755 | ||
ce34fcd0 MD |
756 | pthread_mutex_lock(®istry->lock); |
757 | ||
7972aab2 | 758 | if (!registry->metadata_key || registry->metadata_closed) { |
d88aee68 | 759 | ret = 0; |
1b532a60 | 760 | goto end; |
d88aee68 DG |
761 | } |
762 | ||
d88aee68 | 763 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
764 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
765 | consumer); | |
d88aee68 DG |
766 | if (!socket) { |
767 | ret = -1; | |
7972aab2 | 768 | goto error; |
d88aee68 DG |
769 | } |
770 | ||
7972aab2 | 771 | ret = consumer_close_metadata(socket, registry->metadata_key); |
d88aee68 | 772 | if (ret < 0) { |
7972aab2 | 773 | goto error; |
d88aee68 DG |
774 | } |
775 | ||
d88aee68 | 776 | error: |
1b532a60 DG |
777 | /* |
778 | * Metadata closed. Even on error this means that the consumer is not | |
779 | * responding or not found so either way a second close should NOT be emit | |
780 | * for this registry. | |
781 | */ | |
782 | registry->metadata_closed = 1; | |
783 | end: | |
ce34fcd0 | 784 | pthread_mutex_unlock(®istry->lock); |
7972aab2 | 785 | rcu_read_unlock(); |
d88aee68 DG |
786 | return ret; |
787 | } | |
788 | ||
36b588ed MD |
789 | /* |
790 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
791 | * section and outside of call_rcu thread, so we postpone its execution |
792 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
793 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
794 | */ |
795 | static | |
796 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
797 | { | |
798 | struct ust_app_session *ua_sess = | |
799 | caa_container_of(head, struct ust_app_session, rcu_head); | |
800 | ||
0b2dc8df | 801 | ht_cleanup_push(ua_sess->channels); |
36b588ed MD |
802 | free(ua_sess); |
803 | } | |
804 | ||
d80a6244 DG |
805 | /* |
806 | * Delete ust app session safely. RCU read lock must be held before calling | |
807 | * this function. | |
82cac6d2 JG |
808 | * |
809 | * The session list lock must be held by the caller. | |
d80a6244 | 810 | */ |
8b366481 | 811 | static |
d0b96690 DG |
812 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
813 | struct ust_app *app) | |
d80a6244 DG |
814 | { |
815 | int ret; | |
bec39940 | 816 | struct lttng_ht_iter iter; |
d80a6244 | 817 | struct ust_app_channel *ua_chan; |
7972aab2 | 818 | struct ust_registry_session *registry; |
d80a6244 | 819 | |
d88aee68 DG |
820 | assert(ua_sess); |
821 | ||
1b532a60 DG |
822 | pthread_mutex_lock(&ua_sess->lock); |
823 | ||
b161602a MD |
824 | assert(!ua_sess->deleted); |
825 | ua_sess->deleted = true; | |
826 | ||
7972aab2 | 827 | registry = get_session_registry(ua_sess); |
fad1ed2f | 828 | /* Registry can be null on error path during initialization. */ |
ce34fcd0 | 829 | if (registry) { |
d88aee68 | 830 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 831 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 832 | |
7972aab2 DG |
833 | /* |
834 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
835 | * metadata only on destroy trace session in this case. Also, the |
836 | * previous push metadata could have flag the metadata registry to | |
837 | * close so don't send a close command if closed. | |
7972aab2 | 838 | */ |
ce34fcd0 | 839 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
840 | /* And ask to close it for this session registry. */ |
841 | (void) close_metadata(registry, ua_sess->consumer); | |
842 | } | |
d80a6244 DG |
843 | } |
844 | ||
bec39940 DG |
845 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
846 | node.node) { | |
847 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 848 | assert(!ret); |
d0b96690 | 849 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 850 | } |
d80a6244 | 851 | |
7972aab2 DG |
852 | /* In case of per PID, the registry is kept in the session. */ |
853 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
854 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
855 | if (reg_pid) { | |
fad1ed2f JR |
856 | /* |
857 | * Registry can be null on error path during | |
858 | * initialization. | |
859 | */ | |
7972aab2 DG |
860 | buffer_reg_pid_remove(reg_pid); |
861 | buffer_reg_pid_destroy(reg_pid); | |
862 | } | |
863 | } | |
d0b96690 | 864 | |
aee6bafd | 865 | if (ua_sess->handle != -1) { |
fb45065e | 866 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 867 | ret = ustctl_release_handle(sock, ua_sess->handle); |
fb45065e | 868 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
869 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
870 | ERR("UST app sock %d release session handle failed with ret %d", | |
871 | sock, ret); | |
872 | } | |
10b56aef MD |
873 | /* Remove session from application UST object descriptor. */ |
874 | iter.iter.node = &ua_sess->ust_objd_node.node; | |
875 | ret = lttng_ht_del(app->ust_sessions_objd, &iter); | |
876 | assert(!ret); | |
aee6bafd | 877 | } |
10b56aef | 878 | |
1b532a60 DG |
879 | pthread_mutex_unlock(&ua_sess->lock); |
880 | ||
6addfa37 MD |
881 | consumer_output_put(ua_sess->consumer); |
882 | ||
36b588ed | 883 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 884 | } |
91d76f53 DG |
885 | |
886 | /* | |
284d8f55 DG |
887 | * Delete a traceable application structure from the global list. Never call |
888 | * this function outside of a call_rcu call. | |
36b588ed MD |
889 | * |
890 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 891 | */ |
8b366481 DG |
892 | static |
893 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 894 | { |
8b366481 | 895 | int ret, sock; |
d42f20df | 896 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 897 | |
82cac6d2 JG |
898 | /* |
899 | * The session list lock must be held during this function to guarantee | |
900 | * the existence of ua_sess. | |
901 | */ | |
902 | session_lock_list(); | |
d80a6244 | 903 | /* Delete ust app sessions info */ |
852d0037 DG |
904 | sock = app->sock; |
905 | app->sock = -1; | |
d80a6244 | 906 | |
8b366481 | 907 | /* Wipe sessions */ |
d42f20df DG |
908 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
909 | teardown_node) { | |
910 | /* Free every object in the session and the session. */ | |
36b588ed | 911 | rcu_read_lock(); |
d0b96690 | 912 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 913 | rcu_read_unlock(); |
d80a6244 | 914 | } |
36b588ed | 915 | |
0b2dc8df | 916 | ht_cleanup_push(app->sessions); |
10b56aef | 917 | ht_cleanup_push(app->ust_sessions_objd); |
0b2dc8df | 918 | ht_cleanup_push(app->ust_objd); |
d80a6244 | 919 | |
6414a713 | 920 | /* |
852d0037 DG |
921 | * Wait until we have deleted the application from the sock hash table |
922 | * before closing this socket, otherwise an application could re-use the | |
923 | * socket ID and race with the teardown, using the same hash table entry. | |
924 | * | |
925 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
926 | * all RCU readers that could run concurrently with unregister app, | |
927 | * therefore we _need_ to only close that socket after a grace period. So | |
928 | * it should stay in this RCU callback. | |
929 | * | |
930 | * This close() is a very important step of the synchronization model so | |
931 | * every modification to this function must be carefully reviewed. | |
6414a713 | 932 | */ |
799e2c4f MD |
933 | ret = close(sock); |
934 | if (ret) { | |
935 | PERROR("close"); | |
936 | } | |
4063050c | 937 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 938 | |
852d0037 | 939 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 940 | free(app); |
82cac6d2 | 941 | session_unlock_list(); |
099e26bd DG |
942 | } |
943 | ||
944 | /* | |
f6a9efaa | 945 | * URCU intermediate call to delete an UST app. |
099e26bd | 946 | */ |
8b366481 DG |
947 | static |
948 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 949 | { |
bec39940 DG |
950 | struct lttng_ht_node_ulong *node = |
951 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 952 | struct ust_app *app = |
852d0037 | 953 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 954 | |
852d0037 | 955 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 956 | delete_ust_app(app); |
099e26bd DG |
957 | } |
958 | ||
ffe60014 DG |
959 | /* |
960 | * Delete the session from the application ht and delete the data structure by | |
961 | * freeing every object inside and releasing them. | |
82cac6d2 JG |
962 | * |
963 | * The session list lock must be held by the caller. | |
ffe60014 | 964 | */ |
d0b96690 | 965 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
966 | struct ust_app_session *ua_sess) |
967 | { | |
968 | int ret; | |
969 | struct lttng_ht_iter iter; | |
970 | ||
971 | assert(app); | |
972 | assert(ua_sess); | |
973 | ||
974 | iter.iter.node = &ua_sess->node.node; | |
975 | ret = lttng_ht_del(app->sessions, &iter); | |
976 | if (ret) { | |
977 | /* Already scheduled for teardown. */ | |
978 | goto end; | |
979 | } | |
980 | ||
981 | /* Once deleted, free the data structure. */ | |
d0b96690 | 982 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
983 | |
984 | end: | |
985 | return; | |
986 | } | |
987 | ||
8b366481 DG |
988 | /* |
989 | * Alloc new UST app session. | |
990 | */ | |
991 | static | |
40bbd087 | 992 | struct ust_app_session *alloc_ust_app_session(void) |
8b366481 DG |
993 | { |
994 | struct ust_app_session *ua_sess; | |
995 | ||
996 | /* Init most of the default value by allocating and zeroing */ | |
997 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
998 | if (ua_sess == NULL) { | |
999 | PERROR("malloc"); | |
ffe60014 | 1000 | goto error_free; |
8b366481 DG |
1001 | } |
1002 | ||
1003 | ua_sess->handle = -1; | |
bec39940 | 1004 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
ad7a9107 | 1005 | ua_sess->metadata_attr.type = LTTNG_UST_CHAN_METADATA; |
84ad93e8 | 1006 | pthread_mutex_init(&ua_sess->lock, NULL); |
ad7a9107 | 1007 | |
8b366481 DG |
1008 | return ua_sess; |
1009 | ||
ffe60014 | 1010 | error_free: |
8b366481 DG |
1011 | return NULL; |
1012 | } | |
1013 | ||
1014 | /* | |
1015 | * Alloc new UST app channel. | |
1016 | */ | |
1017 | static | |
1018 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 1019 | struct ust_app_session *ua_sess, |
ffe60014 | 1020 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
1021 | { |
1022 | struct ust_app_channel *ua_chan; | |
1023 | ||
1024 | /* Init most of the default value by allocating and zeroing */ | |
1025 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
1026 | if (ua_chan == NULL) { | |
1027 | PERROR("malloc"); | |
1028 | goto error; | |
1029 | } | |
1030 | ||
1031 | /* Setup channel name */ | |
1032 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
1033 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
1034 | ||
1035 | ua_chan->enabled = 1; | |
1036 | ua_chan->handle = -1; | |
45893984 | 1037 | ua_chan->session = ua_sess; |
ffe60014 | 1038 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
1039 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
1040 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
1041 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
1042 | |
1043 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
31746f93 | 1044 | CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); |
8b366481 DG |
1045 | |
1046 | /* Copy attributes */ | |
1047 | if (attr) { | |
ffe60014 | 1048 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
1049 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
1050 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
1051 | ua_chan->attr.overwrite = attr->overwrite; | |
1052 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
1053 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
1054 | ua_chan->attr.output = attr->output; | |
491d1539 | 1055 | ua_chan->attr.blocking_timeout = attr->u.s.blocking_timeout; |
8b366481 | 1056 | } |
ffe60014 DG |
1057 | /* By default, the channel is a per cpu channel. */ |
1058 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
1059 | |
1060 | DBG3("UST app channel %s allocated", ua_chan->name); | |
1061 | ||
1062 | return ua_chan; | |
1063 | ||
1064 | error: | |
1065 | return NULL; | |
1066 | } | |
1067 | ||
37f1c236 DG |
1068 | /* |
1069 | * Allocate and initialize a UST app stream. | |
1070 | * | |
1071 | * Return newly allocated stream pointer or NULL on error. | |
1072 | */ | |
ffe60014 | 1073 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
1074 | { |
1075 | struct ust_app_stream *stream = NULL; | |
1076 | ||
1077 | stream = zmalloc(sizeof(*stream)); | |
1078 | if (stream == NULL) { | |
1079 | PERROR("zmalloc ust app stream"); | |
1080 | goto error; | |
1081 | } | |
1082 | ||
1083 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
1084 | stream->handle = -1; | |
1085 | ||
1086 | error: | |
1087 | return stream; | |
1088 | } | |
1089 | ||
8b366481 DG |
1090 | /* |
1091 | * Alloc new UST app event. | |
1092 | */ | |
1093 | static | |
1094 | struct ust_app_event *alloc_ust_app_event(char *name, | |
1095 | struct lttng_ust_event *attr) | |
1096 | { | |
1097 | struct ust_app_event *ua_event; | |
1098 | ||
1099 | /* Init most of the default value by allocating and zeroing */ | |
1100 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
1101 | if (ua_event == NULL) { | |
1102 | PERROR("malloc"); | |
1103 | goto error; | |
1104 | } | |
1105 | ||
1106 | ua_event->enabled = 1; | |
1107 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
1108 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 1109 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
1110 | |
1111 | /* Copy attributes */ | |
1112 | if (attr) { | |
1113 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
1114 | } | |
1115 | ||
1116 | DBG3("UST app event %s allocated", ua_event->name); | |
1117 | ||
1118 | return ua_event; | |
1119 | ||
1120 | error: | |
1121 | return NULL; | |
1122 | } | |
1123 | ||
1124 | /* | |
1125 | * Alloc new UST app context. | |
1126 | */ | |
1127 | static | |
bdf64013 | 1128 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context_attr *uctx) |
8b366481 DG |
1129 | { |
1130 | struct ust_app_ctx *ua_ctx; | |
1131 | ||
1132 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
1133 | if (ua_ctx == NULL) { | |
1134 | goto error; | |
1135 | } | |
1136 | ||
31746f93 DG |
1137 | CDS_INIT_LIST_HEAD(&ua_ctx->list); |
1138 | ||
8b366481 DG |
1139 | if (uctx) { |
1140 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
bdf64013 JG |
1141 | if (uctx->ctx == LTTNG_UST_CONTEXT_APP_CONTEXT) { |
1142 | char *provider_name = NULL, *ctx_name = NULL; | |
1143 | ||
1144 | provider_name = strdup(uctx->u.app_ctx.provider_name); | |
1145 | ctx_name = strdup(uctx->u.app_ctx.ctx_name); | |
1146 | if (!provider_name || !ctx_name) { | |
1147 | free(provider_name); | |
1148 | free(ctx_name); | |
1149 | goto error; | |
1150 | } | |
1151 | ||
1152 | ua_ctx->ctx.u.app_ctx.provider_name = provider_name; | |
1153 | ua_ctx->ctx.u.app_ctx.ctx_name = ctx_name; | |
1154 | } | |
8b366481 DG |
1155 | } |
1156 | ||
1157 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
8b366481 | 1158 | return ua_ctx; |
bdf64013 JG |
1159 | error: |
1160 | free(ua_ctx); | |
1161 | return NULL; | |
8b366481 DG |
1162 | } |
1163 | ||
025faf73 DG |
1164 | /* |
1165 | * Allocate a filter and copy the given original filter. | |
1166 | * | |
1167 | * Return allocated filter or NULL on error. | |
1168 | */ | |
51755dc8 JG |
1169 | static struct lttng_filter_bytecode *copy_filter_bytecode( |
1170 | struct lttng_filter_bytecode *orig_f) | |
025faf73 | 1171 | { |
51755dc8 | 1172 | struct lttng_filter_bytecode *filter = NULL; |
025faf73 DG |
1173 | |
1174 | /* Copy filter bytecode */ | |
1175 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
1176 | if (!filter) { | |
51755dc8 | 1177 | PERROR("zmalloc alloc filter bytecode"); |
025faf73 DG |
1178 | goto error; |
1179 | } | |
1180 | ||
1181 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
1182 | ||
1183 | error: | |
1184 | return filter; | |
1185 | } | |
1186 | ||
51755dc8 JG |
1187 | /* |
1188 | * Create a liblttng-ust filter bytecode from given bytecode. | |
1189 | * | |
1190 | * Return allocated filter or NULL on error. | |
1191 | */ | |
1192 | static struct lttng_ust_filter_bytecode *create_ust_bytecode_from_bytecode( | |
1193 | struct lttng_filter_bytecode *orig_f) | |
1194 | { | |
1195 | struct lttng_ust_filter_bytecode *filter = NULL; | |
1196 | ||
1197 | /* Copy filter bytecode */ | |
1198 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
1199 | if (!filter) { | |
1200 | PERROR("zmalloc alloc ust filter bytecode"); | |
1201 | goto error; | |
1202 | } | |
1203 | ||
1204 | assert(sizeof(struct lttng_filter_bytecode) == | |
1205 | sizeof(struct lttng_ust_filter_bytecode)); | |
1206 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
1207 | error: | |
1208 | return filter; | |
1209 | } | |
1210 | ||
099e26bd | 1211 | /* |
421cb601 DG |
1212 | * Find an ust_app using the sock and return it. RCU read side lock must be |
1213 | * held before calling this helper function. | |
099e26bd | 1214 | */ |
f20baf8e | 1215 | struct ust_app *ust_app_find_by_sock(int sock) |
099e26bd | 1216 | { |
bec39940 | 1217 | struct lttng_ht_node_ulong *node; |
bec39940 | 1218 | struct lttng_ht_iter iter; |
f6a9efaa | 1219 | |
852d0037 | 1220 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 1221 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
1222 | if (node == NULL) { |
1223 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
1224 | goto error; |
1225 | } | |
852d0037 DG |
1226 | |
1227 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
1228 | |
1229 | error: | |
1230 | return NULL; | |
099e26bd DG |
1231 | } |
1232 | ||
d0b96690 DG |
1233 | /* |
1234 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
1235 | * be held before calling this helper function. | |
1236 | */ | |
1237 | static struct ust_app *find_app_by_notify_sock(int sock) | |
1238 | { | |
1239 | struct lttng_ht_node_ulong *node; | |
1240 | struct lttng_ht_iter iter; | |
1241 | ||
1242 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
1243 | &iter); | |
1244 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1245 | if (node == NULL) { | |
1246 | DBG2("UST app find by notify sock %d not found", sock); | |
1247 | goto error; | |
1248 | } | |
1249 | ||
1250 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
1251 | ||
1252 | error: | |
1253 | return NULL; | |
1254 | } | |
1255 | ||
025faf73 DG |
1256 | /* |
1257 | * Lookup for an ust app event based on event name, filter bytecode and the | |
1258 | * event loglevel. | |
1259 | * | |
1260 | * Return an ust_app_event object or NULL on error. | |
1261 | */ | |
18eace3b | 1262 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
88e3c2f5 | 1263 | const char *name, const struct lttng_filter_bytecode *filter, |
2106efa0 | 1264 | int loglevel_value, |
39c5a3a7 | 1265 | const struct lttng_event_exclusion *exclusion) |
18eace3b DG |
1266 | { |
1267 | struct lttng_ht_iter iter; | |
1268 | struct lttng_ht_node_str *node; | |
1269 | struct ust_app_event *event = NULL; | |
1270 | struct ust_app_ht_key key; | |
18eace3b DG |
1271 | |
1272 | assert(name); | |
1273 | assert(ht); | |
1274 | ||
1275 | /* Setup key for event lookup. */ | |
1276 | key.name = name; | |
1277 | key.filter = filter; | |
2106efa0 | 1278 | key.loglevel_type = loglevel_value; |
39c5a3a7 | 1279 | /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */ |
51755dc8 | 1280 | key.exclusion = exclusion; |
18eace3b | 1281 | |
025faf73 DG |
1282 | /* Lookup using the event name as hash and a custom match fct. */ |
1283 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1284 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1285 | node = lttng_ht_iter_get_node_str(&iter); |
1286 | if (node == NULL) { | |
1287 | goto end; | |
1288 | } | |
1289 | ||
1290 | event = caa_container_of(node, struct ust_app_event, node); | |
1291 | ||
1292 | end: | |
18eace3b DG |
1293 | return event; |
1294 | } | |
1295 | ||
55cc08a6 DG |
1296 | /* |
1297 | * Create the channel context on the tracer. | |
d0b96690 DG |
1298 | * |
1299 | * Called with UST app session lock held. | |
55cc08a6 DG |
1300 | */ |
1301 | static | |
1302 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1303 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1304 | { | |
1305 | int ret; | |
1306 | ||
840cb59c | 1307 | health_code_update(); |
86acf0da | 1308 | |
fb45065e | 1309 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1310 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 | 1311 | ua_chan->obj, &ua_ctx->obj); |
fb45065e | 1312 | pthread_mutex_unlock(&app->sock_lock); |
55cc08a6 | 1313 | if (ret < 0) { |
ffe60014 DG |
1314 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1315 | ERR("UST app create channel context failed for app (pid: %d) " | |
1316 | "with ret %d", app->pid, ret); | |
1317 | } else { | |
3757b385 DG |
1318 | /* |
1319 | * This is normal behavior, an application can die during the | |
1320 | * creation process. Don't report an error so the execution can | |
1321 | * continue normally. | |
1322 | */ | |
1323 | ret = 0; | |
88e3c2f5 | 1324 | DBG3("UST app add context failed. Application is dead."); |
ffe60014 | 1325 | } |
55cc08a6 DG |
1326 | goto error; |
1327 | } | |
1328 | ||
1329 | ua_ctx->handle = ua_ctx->obj->handle; | |
1330 | ||
d0b96690 DG |
1331 | DBG2("UST app context handle %d created successfully for channel %s", |
1332 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1333 | |
1334 | error: | |
840cb59c | 1335 | health_code_update(); |
55cc08a6 DG |
1336 | return ret; |
1337 | } | |
1338 | ||
53a80697 MD |
1339 | /* |
1340 | * Set the filter on the tracer. | |
1341 | */ | |
1342 | static | |
1343 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
1344 | struct ust_app *app) | |
1345 | { | |
1346 | int ret; | |
51755dc8 | 1347 | struct lttng_ust_filter_bytecode *ust_bytecode = NULL; |
53a80697 | 1348 | |
840cb59c | 1349 | health_code_update(); |
86acf0da | 1350 | |
53a80697 | 1351 | if (!ua_event->filter) { |
86acf0da DG |
1352 | ret = 0; |
1353 | goto error; | |
53a80697 MD |
1354 | } |
1355 | ||
51755dc8 JG |
1356 | ust_bytecode = create_ust_bytecode_from_bytecode(ua_event->filter); |
1357 | if (!ust_bytecode) { | |
1358 | ret = -LTTNG_ERR_NOMEM; | |
1359 | goto error; | |
1360 | } | |
fb45065e | 1361 | pthread_mutex_lock(&app->sock_lock); |
51755dc8 | 1362 | ret = ustctl_set_filter(app->sock, ust_bytecode, |
53a80697 | 1363 | ua_event->obj); |
fb45065e | 1364 | pthread_mutex_unlock(&app->sock_lock); |
53a80697 | 1365 | if (ret < 0) { |
ffe60014 DG |
1366 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1367 | ERR("UST app event %s filter failed for app (pid: %d) " | |
1368 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1369 | } else { | |
3757b385 DG |
1370 | /* |
1371 | * This is normal behavior, an application can die during the | |
1372 | * creation process. Don't report an error so the execution can | |
1373 | * continue normally. | |
1374 | */ | |
1375 | ret = 0; | |
ffe60014 DG |
1376 | DBG3("UST app filter event failed. Application is dead."); |
1377 | } | |
53a80697 MD |
1378 | goto error; |
1379 | } | |
1380 | ||
1381 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
1382 | ||
1383 | error: | |
840cb59c | 1384 | health_code_update(); |
51755dc8 | 1385 | free(ust_bytecode); |
53a80697 MD |
1386 | return ret; |
1387 | } | |
1388 | ||
51755dc8 JG |
1389 | static |
1390 | struct lttng_ust_event_exclusion *create_ust_exclusion_from_exclusion( | |
1391 | struct lttng_event_exclusion *exclusion) | |
1392 | { | |
1393 | struct lttng_ust_event_exclusion *ust_exclusion = NULL; | |
1394 | size_t exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) + | |
1395 | LTTNG_UST_SYM_NAME_LEN * exclusion->count; | |
1396 | ||
1397 | ust_exclusion = zmalloc(exclusion_alloc_size); | |
1398 | if (!ust_exclusion) { | |
1399 | PERROR("malloc"); | |
1400 | goto end; | |
1401 | } | |
1402 | ||
1403 | assert(sizeof(struct lttng_event_exclusion) == | |
1404 | sizeof(struct lttng_ust_event_exclusion)); | |
1405 | memcpy(ust_exclusion, exclusion, exclusion_alloc_size); | |
1406 | end: | |
1407 | return ust_exclusion; | |
1408 | } | |
1409 | ||
7cc9a73c JI |
1410 | /* |
1411 | * Set event exclusions on the tracer. | |
1412 | */ | |
1413 | static | |
1414 | int set_ust_event_exclusion(struct ust_app_event *ua_event, | |
1415 | struct ust_app *app) | |
1416 | { | |
1417 | int ret; | |
51755dc8 | 1418 | struct lttng_ust_event_exclusion *ust_exclusion = NULL; |
7cc9a73c JI |
1419 | |
1420 | health_code_update(); | |
1421 | ||
1422 | if (!ua_event->exclusion || !ua_event->exclusion->count) { | |
1423 | ret = 0; | |
1424 | goto error; | |
1425 | } | |
1426 | ||
51755dc8 JG |
1427 | ust_exclusion = create_ust_exclusion_from_exclusion( |
1428 | ua_event->exclusion); | |
1429 | if (!ust_exclusion) { | |
1430 | ret = -LTTNG_ERR_NOMEM; | |
1431 | goto error; | |
1432 | } | |
fb45065e | 1433 | pthread_mutex_lock(&app->sock_lock); |
51755dc8 | 1434 | ret = ustctl_set_exclusion(app->sock, ust_exclusion, ua_event->obj); |
fb45065e | 1435 | pthread_mutex_unlock(&app->sock_lock); |
7cc9a73c JI |
1436 | if (ret < 0) { |
1437 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1438 | ERR("UST app event %s exclusions failed for app (pid: %d) " | |
1439 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1440 | } else { | |
1441 | /* | |
1442 | * This is normal behavior, an application can die during the | |
1443 | * creation process. Don't report an error so the execution can | |
1444 | * continue normally. | |
1445 | */ | |
1446 | ret = 0; | |
1447 | DBG3("UST app event exclusion failed. Application is dead."); | |
1448 | } | |
1449 | goto error; | |
1450 | } | |
1451 | ||
1452 | DBG2("UST exclusion set successfully for event %s", ua_event->name); | |
1453 | ||
1454 | error: | |
1455 | health_code_update(); | |
51755dc8 | 1456 | free(ust_exclusion); |
7cc9a73c JI |
1457 | return ret; |
1458 | } | |
1459 | ||
9730260e DG |
1460 | /* |
1461 | * Disable the specified event on to UST tracer for the UST session. | |
1462 | */ | |
1463 | static int disable_ust_event(struct ust_app *app, | |
1464 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1465 | { | |
1466 | int ret; | |
1467 | ||
840cb59c | 1468 | health_code_update(); |
86acf0da | 1469 | |
fb45065e | 1470 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1471 | ret = ustctl_disable(app->sock, ua_event->obj); |
fb45065e | 1472 | pthread_mutex_unlock(&app->sock_lock); |
9730260e | 1473 | if (ret < 0) { |
ffe60014 DG |
1474 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1475 | ERR("UST app event %s disable failed for app (pid: %d) " | |
1476 | "and session handle %d with ret %d", | |
1477 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1478 | } else { | |
3757b385 DG |
1479 | /* |
1480 | * This is normal behavior, an application can die during the | |
1481 | * creation process. Don't report an error so the execution can | |
1482 | * continue normally. | |
1483 | */ | |
1484 | ret = 0; | |
ffe60014 DG |
1485 | DBG3("UST app disable event failed. Application is dead."); |
1486 | } | |
9730260e DG |
1487 | goto error; |
1488 | } | |
1489 | ||
1490 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 1491 | ua_event->attr.name, app->pid); |
9730260e DG |
1492 | |
1493 | error: | |
840cb59c | 1494 | health_code_update(); |
9730260e DG |
1495 | return ret; |
1496 | } | |
1497 | ||
78f0bacd DG |
1498 | /* |
1499 | * Disable the specified channel on to UST tracer for the UST session. | |
1500 | */ | |
1501 | static int disable_ust_channel(struct ust_app *app, | |
1502 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1503 | { | |
1504 | int ret; | |
1505 | ||
840cb59c | 1506 | health_code_update(); |
86acf0da | 1507 | |
fb45065e | 1508 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1509 | ret = ustctl_disable(app->sock, ua_chan->obj); |
fb45065e | 1510 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1511 | if (ret < 0) { |
ffe60014 DG |
1512 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1513 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1514 | "and session handle %d with ret %d", | |
1515 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1516 | } else { | |
3757b385 DG |
1517 | /* |
1518 | * This is normal behavior, an application can die during the | |
1519 | * creation process. Don't report an error so the execution can | |
1520 | * continue normally. | |
1521 | */ | |
1522 | ret = 0; | |
ffe60014 DG |
1523 | DBG3("UST app disable channel failed. Application is dead."); |
1524 | } | |
78f0bacd DG |
1525 | goto error; |
1526 | } | |
1527 | ||
78f0bacd | 1528 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1529 | ua_chan->name, app->pid); |
78f0bacd DG |
1530 | |
1531 | error: | |
840cb59c | 1532 | health_code_update(); |
78f0bacd DG |
1533 | return ret; |
1534 | } | |
1535 | ||
1536 | /* | |
1537 | * Enable the specified channel on to UST tracer for the UST session. | |
1538 | */ | |
1539 | static int enable_ust_channel(struct ust_app *app, | |
1540 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1541 | { | |
1542 | int ret; | |
1543 | ||
840cb59c | 1544 | health_code_update(); |
86acf0da | 1545 | |
fb45065e | 1546 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1547 | ret = ustctl_enable(app->sock, ua_chan->obj); |
fb45065e | 1548 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1549 | if (ret < 0) { |
ffe60014 DG |
1550 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1551 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1552 | "and session handle %d with ret %d", | |
1553 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1554 | } else { | |
3757b385 DG |
1555 | /* |
1556 | * This is normal behavior, an application can die during the | |
1557 | * creation process. Don't report an error so the execution can | |
1558 | * continue normally. | |
1559 | */ | |
1560 | ret = 0; | |
ffe60014 DG |
1561 | DBG3("UST app enable channel failed. Application is dead."); |
1562 | } | |
78f0bacd DG |
1563 | goto error; |
1564 | } | |
1565 | ||
1566 | ua_chan->enabled = 1; | |
1567 | ||
1568 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1569 | ua_chan->name, app->pid); |
78f0bacd DG |
1570 | |
1571 | error: | |
840cb59c | 1572 | health_code_update(); |
78f0bacd DG |
1573 | return ret; |
1574 | } | |
1575 | ||
edb67388 DG |
1576 | /* |
1577 | * Enable the specified event on to UST tracer for the UST session. | |
1578 | */ | |
1579 | static int enable_ust_event(struct ust_app *app, | |
1580 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1581 | { | |
1582 | int ret; | |
1583 | ||
840cb59c | 1584 | health_code_update(); |
86acf0da | 1585 | |
fb45065e | 1586 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1587 | ret = ustctl_enable(app->sock, ua_event->obj); |
fb45065e | 1588 | pthread_mutex_unlock(&app->sock_lock); |
edb67388 | 1589 | if (ret < 0) { |
ffe60014 DG |
1590 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1591 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1592 | "and session handle %d with ret %d", | |
1593 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1594 | } else { | |
3757b385 DG |
1595 | /* |
1596 | * This is normal behavior, an application can die during the | |
1597 | * creation process. Don't report an error so the execution can | |
1598 | * continue normally. | |
1599 | */ | |
1600 | ret = 0; | |
ffe60014 DG |
1601 | DBG3("UST app enable event failed. Application is dead."); |
1602 | } | |
edb67388 DG |
1603 | goto error; |
1604 | } | |
1605 | ||
1606 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1607 | ua_event->attr.name, app->pid); |
edb67388 DG |
1608 | |
1609 | error: | |
840cb59c | 1610 | health_code_update(); |
edb67388 DG |
1611 | return ret; |
1612 | } | |
1613 | ||
099e26bd | 1614 | /* |
7972aab2 | 1615 | * Send channel and stream buffer to application. |
4f3ab6ee | 1616 | * |
ffe60014 | 1617 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1618 | */ |
7972aab2 DG |
1619 | static int send_channel_pid_to_ust(struct ust_app *app, |
1620 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1621 | { |
1622 | int ret; | |
ffe60014 | 1623 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1624 | |
1625 | assert(app); | |
ffe60014 | 1626 | assert(ua_sess); |
4f3ab6ee | 1627 | assert(ua_chan); |
4f3ab6ee | 1628 | |
840cb59c | 1629 | health_code_update(); |
4f3ab6ee | 1630 | |
7972aab2 DG |
1631 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1632 | app->sock); | |
86acf0da | 1633 | |
ffe60014 DG |
1634 | /* Send channel to the application. */ |
1635 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
1636 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1637 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1638 | goto error; | |
1639 | } else if (ret < 0) { | |
b551a063 DG |
1640 | goto error; |
1641 | } | |
1642 | ||
d88aee68 DG |
1643 | health_code_update(); |
1644 | ||
ffe60014 DG |
1645 | /* Send all streams to application. */ |
1646 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1647 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
a7169585 MD |
1648 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1649 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1650 | goto error; | |
1651 | } else if (ret < 0) { | |
ffe60014 DG |
1652 | goto error; |
1653 | } | |
1654 | /* We don't need the stream anymore once sent to the tracer. */ | |
1655 | cds_list_del(&stream->list); | |
fb45065e | 1656 | delete_ust_app_stream(-1, stream, app); |
ffe60014 | 1657 | } |
ffe60014 DG |
1658 | /* Flag the channel that it is sent to the application. */ |
1659 | ua_chan->is_sent = 1; | |
ffe60014 | 1660 | |
b551a063 | 1661 | error: |
840cb59c | 1662 | health_code_update(); |
b551a063 DG |
1663 | return ret; |
1664 | } | |
1665 | ||
91d76f53 | 1666 | /* |
5b4a0ec0 | 1667 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1668 | * |
1669 | * Should be called with session mutex held. | |
91d76f53 | 1670 | */ |
edb67388 DG |
1671 | static |
1672 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1673 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1674 | { |
5b4a0ec0 | 1675 | int ret = 0; |
284d8f55 | 1676 | |
840cb59c | 1677 | health_code_update(); |
86acf0da | 1678 | |
5b4a0ec0 | 1679 | /* Create UST event on tracer */ |
fb45065e | 1680 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1681 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 | 1682 | &ua_event->obj); |
fb45065e | 1683 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 | 1684 | if (ret < 0) { |
ffe60014 | 1685 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
88e3c2f5 | 1686 | abort(); |
ffe60014 DG |
1687 | ERR("Error ustctl create event %s for app pid: %d with ret %d", |
1688 | ua_event->attr.name, app->pid, ret); | |
1689 | } else { | |
3757b385 DG |
1690 | /* |
1691 | * This is normal behavior, an application can die during the | |
1692 | * creation process. Don't report an error so the execution can | |
1693 | * continue normally. | |
1694 | */ | |
1695 | ret = 0; | |
ffe60014 DG |
1696 | DBG3("UST app create event failed. Application is dead."); |
1697 | } | |
5b4a0ec0 | 1698 | goto error; |
91d76f53 | 1699 | } |
f6a9efaa | 1700 | |
5b4a0ec0 | 1701 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1702 | |
5b4a0ec0 | 1703 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1704 | ua_event->attr.name, app->pid); |
f6a9efaa | 1705 | |
840cb59c | 1706 | health_code_update(); |
86acf0da | 1707 | |
025faf73 DG |
1708 | /* Set filter if one is present. */ |
1709 | if (ua_event->filter) { | |
1710 | ret = set_ust_event_filter(ua_event, app); | |
1711 | if (ret < 0) { | |
1712 | goto error; | |
1713 | } | |
1714 | } | |
1715 | ||
7cc9a73c JI |
1716 | /* Set exclusions for the event */ |
1717 | if (ua_event->exclusion) { | |
1718 | ret = set_ust_event_exclusion(ua_event, app); | |
1719 | if (ret < 0) { | |
1720 | goto error; | |
1721 | } | |
1722 | } | |
1723 | ||
8535a6d9 | 1724 | /* If event not enabled, disable it on the tracer */ |
40113787 MD |
1725 | if (ua_event->enabled) { |
1726 | /* | |
1727 | * We now need to explicitly enable the event, since it | |
1728 | * is now disabled at creation. | |
1729 | */ | |
1730 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1731 | if (ret < 0) { | |
1732 | /* | |
1733 | * If we hit an EPERM, something is wrong with our enable call. If | |
1734 | * we get an EEXIST, there is a problem on the tracer side since we | |
1735 | * just created it. | |
1736 | */ | |
1737 | switch (ret) { | |
1738 | case -LTTNG_UST_ERR_PERM: | |
1739 | /* Code flow problem */ | |
1740 | assert(0); | |
1741 | case -LTTNG_UST_ERR_EXIST: | |
1742 | /* It's OK for our use case. */ | |
1743 | ret = 0; | |
1744 | break; | |
1745 | default: | |
1746 | break; | |
1747 | } | |
1748 | goto error; | |
1749 | } | |
8535a6d9 DG |
1750 | } |
1751 | ||
5b4a0ec0 | 1752 | error: |
840cb59c | 1753 | health_code_update(); |
5b4a0ec0 | 1754 | return ret; |
91d76f53 | 1755 | } |
48842b30 | 1756 | |
5b4a0ec0 DG |
1757 | /* |
1758 | * Copy data between an UST app event and a LTT event. | |
1759 | */ | |
421cb601 | 1760 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1761 | struct ltt_ust_event *uevent) |
1762 | { | |
b4ffad32 JI |
1763 | size_t exclusion_alloc_size; |
1764 | ||
48842b30 DG |
1765 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); |
1766 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1767 | ||
fc34caaa DG |
1768 | ua_event->enabled = uevent->enabled; |
1769 | ||
5b4a0ec0 DG |
1770 | /* Copy event attributes */ |
1771 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1772 | ||
53a80697 MD |
1773 | /* Copy filter bytecode */ |
1774 | if (uevent->filter) { | |
51755dc8 | 1775 | ua_event->filter = copy_filter_bytecode(uevent->filter); |
025faf73 | 1776 | /* Filter might be NULL here in case of ENONEM. */ |
53a80697 | 1777 | } |
b4ffad32 JI |
1778 | |
1779 | /* Copy exclusion data */ | |
1780 | if (uevent->exclusion) { | |
51755dc8 | 1781 | exclusion_alloc_size = sizeof(struct lttng_event_exclusion) + |
b4ffad32 JI |
1782 | LTTNG_UST_SYM_NAME_LEN * uevent->exclusion->count; |
1783 | ua_event->exclusion = zmalloc(exclusion_alloc_size); | |
5f8df26c JI |
1784 | if (ua_event->exclusion == NULL) { |
1785 | PERROR("malloc"); | |
1786 | } else { | |
1787 | memcpy(ua_event->exclusion, uevent->exclusion, | |
1788 | exclusion_alloc_size); | |
b4ffad32 JI |
1789 | } |
1790 | } | |
48842b30 DG |
1791 | } |
1792 | ||
5b4a0ec0 DG |
1793 | /* |
1794 | * Copy data between an UST app channel and a LTT channel. | |
1795 | */ | |
421cb601 | 1796 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1797 | struct ltt_ust_channel *uchan) |
1798 | { | |
fc34caaa | 1799 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1800 | |
1801 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1802 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 1803 | |
1624d5b7 JD |
1804 | ua_chan->tracefile_size = uchan->tracefile_size; |
1805 | ua_chan->tracefile_count = uchan->tracefile_count; | |
1806 | ||
ffe60014 DG |
1807 | /* Copy event attributes since the layout is different. */ |
1808 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1809 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1810 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1811 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1812 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
e9404c27 | 1813 | ua_chan->monitor_timer_interval = uchan->monitor_timer_interval; |
ffe60014 | 1814 | ua_chan->attr.output = uchan->attr.output; |
491d1539 MD |
1815 | ua_chan->attr.blocking_timeout = uchan->attr.u.s.blocking_timeout; |
1816 | ||
ffe60014 DG |
1817 | /* |
1818 | * Note that the attribute channel type is not set since the channel on the | |
1819 | * tracing registry side does not have this information. | |
1820 | */ | |
48842b30 | 1821 | |
fc34caaa | 1822 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1823 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1824 | |
fc34caaa | 1825 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1826 | } |
1827 | ||
5b4a0ec0 DG |
1828 | /* |
1829 | * Copy data between a UST app session and a regular LTT session. | |
1830 | */ | |
421cb601 | 1831 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1832 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1833 | { |
477d7741 MD |
1834 | time_t rawtime; |
1835 | struct tm *timeinfo; | |
1836 | char datetime[16]; | |
1837 | int ret; | |
d7ba1388 | 1838 | char tmp_shm_path[PATH_MAX]; |
477d7741 MD |
1839 | |
1840 | /* Get date and time for unique app path */ | |
1841 | time(&rawtime); | |
1842 | timeinfo = localtime(&rawtime); | |
1843 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1844 | |
421cb601 | 1845 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1846 | |
7972aab2 DG |
1847 | ua_sess->tracing_id = usess->id; |
1848 | ua_sess->id = get_next_session_id(); | |
1849 | ua_sess->uid = app->uid; | |
1850 | ua_sess->gid = app->gid; | |
1851 | ua_sess->euid = usess->uid; | |
1852 | ua_sess->egid = usess->gid; | |
1853 | ua_sess->buffer_type = usess->buffer_type; | |
1854 | ua_sess->bits_per_long = app->bits_per_long; | |
6addfa37 | 1855 | |
7972aab2 | 1856 | /* There is only one consumer object per session possible. */ |
6addfa37 | 1857 | consumer_output_get(usess->consumer); |
7972aab2 | 1858 | ua_sess->consumer = usess->consumer; |
6addfa37 | 1859 | |
2bba9e53 | 1860 | ua_sess->output_traces = usess->output_traces; |
ecc48a90 | 1861 | ua_sess->live_timer_interval = usess->live_timer_interval; |
84ad93e8 DG |
1862 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, |
1863 | &usess->metadata_attr); | |
7972aab2 DG |
1864 | |
1865 | switch (ua_sess->buffer_type) { | |
1866 | case LTTNG_BUFFER_PER_PID: | |
1867 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 1868 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
1869 | datetime); |
1870 | break; | |
1871 | case LTTNG_BUFFER_PER_UID: | |
1872 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1873 | DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long); | |
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 MD |
1992 | app->uint64_t_alignment, app->long_alignment, |
1993 | app->byte_order, app->version.major, | |
3d071855 MD |
1994 | app->version.minor, reg_pid->root_shm_path, |
1995 | reg_pid->shm_path, | |
d7ba1388 | 1996 | ua_sess->euid, ua_sess->egid); |
7972aab2 | 1997 | if (ret < 0) { |
286c991a MD |
1998 | /* |
1999 | * reg_pid->registry->reg.ust is NULL upon error, so we need to | |
2000 | * destroy the buffer registry, because it is always expected | |
2001 | * that if the buffer registry can be found, its ust registry is | |
2002 | * non-NULL. | |
2003 | */ | |
2004 | buffer_reg_pid_destroy(reg_pid); | |
7972aab2 DG |
2005 | goto error; |
2006 | } | |
2007 | ||
286c991a MD |
2008 | buffer_reg_pid_add(reg_pid); |
2009 | ||
7972aab2 DG |
2010 | DBG3("UST app buffer registry per PID created successfully"); |
2011 | ||
2012 | end: | |
2013 | if (regp) { | |
2014 | *regp = reg_pid; | |
2015 | } | |
2016 | error: | |
2017 | rcu_read_unlock(); | |
2018 | return ret; | |
2019 | } | |
2020 | ||
2021 | /* | |
2022 | * Setup buffer registry per UID for the given session and application. If none | |
2023 | * is found, a new one is created, added to the global registry and | |
2024 | * initialized. If regp is valid, it's set with the newly created object. | |
2025 | * | |
2026 | * Return 0 on success or else a negative value. | |
2027 | */ | |
2028 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
d7ba1388 | 2029 | struct ust_app_session *ua_sess, |
7972aab2 DG |
2030 | struct ust_app *app, struct buffer_reg_uid **regp) |
2031 | { | |
2032 | int ret = 0; | |
2033 | struct buffer_reg_uid *reg_uid; | |
2034 | ||
2035 | assert(usess); | |
2036 | assert(app); | |
2037 | ||
2038 | rcu_read_lock(); | |
2039 | ||
2040 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2041 | if (!reg_uid) { | |
2042 | /* | |
2043 | * This is the create channel path meaning that if there is NO | |
2044 | * registry available, we have to create one for this session. | |
2045 | */ | |
2046 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
3d071855 MD |
2047 | LTTNG_DOMAIN_UST, ®_uid, |
2048 | ua_sess->root_shm_path, ua_sess->shm_path); | |
7972aab2 DG |
2049 | if (ret < 0) { |
2050 | goto error; | |
2051 | } | |
7972aab2 DG |
2052 | } else { |
2053 | goto end; | |
2054 | } | |
2055 | ||
2056 | /* Initialize registry. */ | |
af6142cf | 2057 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
2058 | app->bits_per_long, app->uint8_t_alignment, |
2059 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
2060 | app->uint64_t_alignment, app->long_alignment, |
2061 | app->byte_order, app->version.major, | |
3d071855 MD |
2062 | app->version.minor, reg_uid->root_shm_path, |
2063 | reg_uid->shm_path, usess->uid, usess->gid); | |
7972aab2 | 2064 | if (ret < 0) { |
286c991a MD |
2065 | /* |
2066 | * reg_uid->registry->reg.ust is NULL upon error, so we need to | |
2067 | * destroy the buffer registry, because it is always expected | |
2068 | * that if the buffer registry can be found, its ust registry is | |
2069 | * non-NULL. | |
2070 | */ | |
2071 | buffer_reg_uid_destroy(reg_uid, NULL); | |
7972aab2 DG |
2072 | goto error; |
2073 | } | |
2074 | /* Add node to teardown list of the session. */ | |
2075 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
2076 | ||
286c991a | 2077 | buffer_reg_uid_add(reg_uid); |
7972aab2 | 2078 | |
286c991a | 2079 | DBG3("UST app buffer registry per UID created successfully"); |
7972aab2 DG |
2080 | end: |
2081 | if (regp) { | |
2082 | *regp = reg_uid; | |
2083 | } | |
2084 | error: | |
2085 | rcu_read_unlock(); | |
2086 | return ret; | |
2087 | } | |
2088 | ||
421cb601 | 2089 | /* |
3d8ca23b | 2090 | * Create a session on the tracer side for the given app. |
421cb601 | 2091 | * |
3d8ca23b DG |
2092 | * On success, ua_sess_ptr is populated with the session pointer or else left |
2093 | * untouched. If the session was created, is_created is set to 1. On error, | |
2094 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
2095 | * be NULL. | |
2096 | * | |
2097 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
2098 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 2099 | */ |
03f91eaa | 2100 | static int find_or_create_ust_app_session(struct ltt_ust_session *usess, |
3d8ca23b DG |
2101 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, |
2102 | int *is_created) | |
421cb601 | 2103 | { |
3d8ca23b | 2104 | int ret, created = 0; |
421cb601 DG |
2105 | struct ust_app_session *ua_sess; |
2106 | ||
3d8ca23b DG |
2107 | assert(usess); |
2108 | assert(app); | |
2109 | assert(ua_sess_ptr); | |
2110 | ||
840cb59c | 2111 | health_code_update(); |
86acf0da | 2112 | |
421cb601 DG |
2113 | ua_sess = lookup_session_by_app(usess, app); |
2114 | if (ua_sess == NULL) { | |
d9bf3ca4 | 2115 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 2116 | app->pid, usess->id); |
40bbd087 | 2117 | ua_sess = alloc_ust_app_session(); |
421cb601 DG |
2118 | if (ua_sess == NULL) { |
2119 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
2120 | ret = -ENOMEM; |
2121 | goto error; | |
421cb601 | 2122 | } |
477d7741 | 2123 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 2124 | created = 1; |
421cb601 DG |
2125 | } |
2126 | ||
7972aab2 DG |
2127 | switch (usess->buffer_type) { |
2128 | case LTTNG_BUFFER_PER_PID: | |
2129 | /* Init local registry. */ | |
2130 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 2131 | if (ret < 0) { |
e64207cf | 2132 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2133 | goto error; |
2134 | } | |
2135 | break; | |
2136 | case LTTNG_BUFFER_PER_UID: | |
2137 | /* Look for a global registry. If none exists, create one. */ | |
d7ba1388 | 2138 | ret = setup_buffer_reg_uid(usess, ua_sess, app, NULL); |
7972aab2 | 2139 | if (ret < 0) { |
e64207cf | 2140 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2141 | goto error; |
2142 | } | |
2143 | break; | |
2144 | default: | |
2145 | assert(0); | |
2146 | ret = -EINVAL; | |
2147 | goto error; | |
2148 | } | |
2149 | ||
2150 | health_code_update(); | |
2151 | ||
2152 | if (ua_sess->handle == -1) { | |
fb45065e | 2153 | pthread_mutex_lock(&app->sock_lock); |
7972aab2 | 2154 | ret = ustctl_create_session(app->sock); |
fb45065e | 2155 | pthread_mutex_unlock(&app->sock_lock); |
7972aab2 DG |
2156 | if (ret < 0) { |
2157 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
2158 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
2159 | app->pid, ret); |
2160 | } else { | |
2161 | DBG("UST app creating session failed. Application is dead"); | |
3757b385 DG |
2162 | /* |
2163 | * This is normal behavior, an application can die during the | |
2164 | * creation process. Don't report an error so the execution can | |
2165 | * continue normally. This will get flagged ENOTCONN and the | |
2166 | * caller will handle it. | |
2167 | */ | |
2168 | ret = 0; | |
ffe60014 | 2169 | } |
d0b96690 | 2170 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
2171 | if (ret != -ENOMEM) { |
2172 | /* | |
2173 | * Tracer is probably gone or got an internal error so let's | |
2174 | * behave like it will soon unregister or not usable. | |
2175 | */ | |
2176 | ret = -ENOTCONN; | |
2177 | } | |
2178 | goto error; | |
421cb601 DG |
2179 | } |
2180 | ||
7972aab2 DG |
2181 | ua_sess->handle = ret; |
2182 | ||
2183 | /* Add ust app session to app's HT */ | |
d9bf3ca4 MD |
2184 | lttng_ht_node_init_u64(&ua_sess->node, |
2185 | ua_sess->tracing_id); | |
2186 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
10b56aef MD |
2187 | lttng_ht_node_init_ulong(&ua_sess->ust_objd_node, ua_sess->handle); |
2188 | lttng_ht_add_unique_ulong(app->ust_sessions_objd, | |
2189 | &ua_sess->ust_objd_node); | |
7972aab2 DG |
2190 | |
2191 | DBG2("UST app session created successfully with handle %d", ret); | |
2192 | } | |
2193 | ||
2194 | *ua_sess_ptr = ua_sess; | |
2195 | if (is_created) { | |
2196 | *is_created = created; | |
2197 | } | |
2198 | ||
2199 | /* Everything went well. */ | |
2200 | ret = 0; | |
2201 | ||
2202 | error: | |
2203 | health_code_update(); | |
2204 | return ret; | |
2205 | } | |
2206 | ||
6a6b2068 JG |
2207 | /* |
2208 | * Match function for a hash table lookup of ust_app_ctx. | |
2209 | * | |
2210 | * It matches an ust app context based on the context type and, in the case | |
2211 | * of perf counters, their name. | |
2212 | */ | |
2213 | static int ht_match_ust_app_ctx(struct cds_lfht_node *node, const void *_key) | |
2214 | { | |
2215 | struct ust_app_ctx *ctx; | |
bdf64013 | 2216 | const struct lttng_ust_context_attr *key; |
6a6b2068 JG |
2217 | |
2218 | assert(node); | |
2219 | assert(_key); | |
2220 | ||
2221 | ctx = caa_container_of(node, struct ust_app_ctx, node.node); | |
2222 | key = _key; | |
2223 | ||
2224 | /* Context type */ | |
2225 | if (ctx->ctx.ctx != key->ctx) { | |
2226 | goto no_match; | |
2227 | } | |
2228 | ||
bdf64013 JG |
2229 | switch(key->ctx) { |
2230 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: | |
6a6b2068 | 2231 | if (strncmp(key->u.perf_counter.name, |
bdf64013 JG |
2232 | ctx->ctx.u.perf_counter.name, |
2233 | sizeof(key->u.perf_counter.name))) { | |
2234 | goto no_match; | |
2235 | } | |
2236 | break; | |
2237 | case LTTNG_UST_CONTEXT_APP_CONTEXT: | |
2238 | if (strcmp(key->u.app_ctx.provider_name, | |
2239 | ctx->ctx.u.app_ctx.provider_name) || | |
2240 | strcmp(key->u.app_ctx.ctx_name, | |
2241 | ctx->ctx.u.app_ctx.ctx_name)) { | |
6a6b2068 JG |
2242 | goto no_match; |
2243 | } | |
bdf64013 JG |
2244 | break; |
2245 | default: | |
2246 | break; | |
6a6b2068 JG |
2247 | } |
2248 | ||
2249 | /* Match. */ | |
2250 | return 1; | |
2251 | ||
2252 | no_match: | |
2253 | return 0; | |
2254 | } | |
2255 | ||
2256 | /* | |
2257 | * Lookup for an ust app context from an lttng_ust_context. | |
2258 | * | |
be184a0f | 2259 | * Must be called while holding RCU read side lock. |
6a6b2068 JG |
2260 | * Return an ust_app_ctx object or NULL on error. |
2261 | */ | |
2262 | static | |
2263 | struct ust_app_ctx *find_ust_app_context(struct lttng_ht *ht, | |
bdf64013 | 2264 | struct lttng_ust_context_attr *uctx) |
6a6b2068 JG |
2265 | { |
2266 | struct lttng_ht_iter iter; | |
2267 | struct lttng_ht_node_ulong *node; | |
2268 | struct ust_app_ctx *app_ctx = NULL; | |
2269 | ||
2270 | assert(uctx); | |
2271 | assert(ht); | |
2272 | ||
2273 | /* Lookup using the lttng_ust_context_type and a custom match fct. */ | |
2274 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) uctx->ctx, lttng_ht_seed), | |
2275 | ht_match_ust_app_ctx, uctx, &iter.iter); | |
2276 | node = lttng_ht_iter_get_node_ulong(&iter); | |
2277 | if (!node) { | |
2278 | goto end; | |
2279 | } | |
2280 | ||
2281 | app_ctx = caa_container_of(node, struct ust_app_ctx, node); | |
2282 | ||
2283 | end: | |
2284 | return app_ctx; | |
2285 | } | |
2286 | ||
7972aab2 DG |
2287 | /* |
2288 | * Create a context for the channel on the tracer. | |
2289 | * | |
2290 | * Called with UST app session lock held and a RCU read side lock. | |
2291 | */ | |
2292 | static | |
c9edf082 | 2293 | int create_ust_app_channel_context(struct ust_app_channel *ua_chan, |
bdf64013 | 2294 | struct lttng_ust_context_attr *uctx, |
7972aab2 DG |
2295 | struct ust_app *app) |
2296 | { | |
2297 | int ret = 0; | |
7972aab2 DG |
2298 | struct ust_app_ctx *ua_ctx; |
2299 | ||
2300 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
2301 | ||
6a6b2068 JG |
2302 | ua_ctx = find_ust_app_context(ua_chan->ctx, uctx); |
2303 | if (ua_ctx) { | |
7972aab2 DG |
2304 | ret = -EEXIST; |
2305 | goto error; | |
2306 | } | |
2307 | ||
2308 | ua_ctx = alloc_ust_app_ctx(uctx); | |
2309 | if (ua_ctx == NULL) { | |
2310 | /* malloc failed */ | |
7682f304 | 2311 | ret = -ENOMEM; |
7972aab2 DG |
2312 | goto error; |
2313 | } | |
2314 | ||
2315 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 2316 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 2317 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
2318 | |
2319 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
2320 | if (ret < 0) { | |
2321 | goto error; | |
2322 | } | |
2323 | ||
2324 | error: | |
2325 | return ret; | |
2326 | } | |
2327 | ||
2328 | /* | |
2329 | * Enable on the tracer side a ust app event for the session and channel. | |
2330 | * | |
2331 | * Called with UST app session lock held. | |
2332 | */ | |
2333 | static | |
2334 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
2335 | struct ust_app_event *ua_event, struct ust_app *app) | |
2336 | { | |
2337 | int ret; | |
2338 | ||
2339 | ret = enable_ust_event(app, ua_sess, ua_event); | |
2340 | if (ret < 0) { | |
2341 | goto error; | |
2342 | } | |
2343 | ||
2344 | ua_event->enabled = 1; | |
2345 | ||
2346 | error: | |
2347 | return ret; | |
2348 | } | |
2349 | ||
2350 | /* | |
2351 | * Disable on the tracer side a ust app event for the session and channel. | |
2352 | */ | |
2353 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
2354 | struct ust_app_event *ua_event, struct ust_app *app) | |
2355 | { | |
2356 | int ret; | |
2357 | ||
2358 | ret = disable_ust_event(app, ua_sess, ua_event); | |
2359 | if (ret < 0) { | |
2360 | goto error; | |
2361 | } | |
2362 | ||
2363 | ua_event->enabled = 0; | |
2364 | ||
2365 | error: | |
2366 | return ret; | |
2367 | } | |
2368 | ||
2369 | /* | |
2370 | * Lookup ust app channel for session and disable it on the tracer side. | |
2371 | */ | |
2372 | static | |
2373 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
2374 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
2375 | { | |
2376 | int ret; | |
2377 | ||
2378 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2379 | if (ret < 0) { | |
2380 | goto error; | |
2381 | } | |
2382 | ||
2383 | ua_chan->enabled = 0; | |
2384 | ||
2385 | error: | |
2386 | return ret; | |
2387 | } | |
2388 | ||
2389 | /* | |
2390 | * Lookup ust app channel for session and enable it on the tracer side. This | |
2391 | * MUST be called with a RCU read side lock acquired. | |
2392 | */ | |
2393 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
2394 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
2395 | { | |
2396 | int ret = 0; | |
2397 | struct lttng_ht_iter iter; | |
2398 | struct lttng_ht_node_str *ua_chan_node; | |
2399 | struct ust_app_channel *ua_chan; | |
2400 | ||
2401 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
2402 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
2403 | if (ua_chan_node == NULL) { | |
d9bf3ca4 | 2404 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
2405 | uchan->name, ua_sess->tracing_id); |
2406 | goto error; | |
2407 | } | |
2408 | ||
2409 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2410 | ||
2411 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
2412 | if (ret < 0) { | |
2413 | goto error; | |
2414 | } | |
2415 | ||
2416 | error: | |
2417 | return ret; | |
2418 | } | |
2419 | ||
2420 | /* | |
2421 | * Ask the consumer to create a channel and get it if successful. | |
2422 | * | |
fad1ed2f JR |
2423 | * Called with UST app session lock held. |
2424 | * | |
7972aab2 DG |
2425 | * Return 0 on success or else a negative value. |
2426 | */ | |
2427 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
2428 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
e098433c JG |
2429 | int bitness, struct ust_registry_session *registry, |
2430 | uint64_t trace_archive_id) | |
7972aab2 DG |
2431 | { |
2432 | int ret; | |
2433 | unsigned int nb_fd = 0; | |
2434 | struct consumer_socket *socket; | |
2435 | ||
2436 | assert(usess); | |
2437 | assert(ua_sess); | |
2438 | assert(ua_chan); | |
2439 | assert(registry); | |
2440 | ||
2441 | rcu_read_lock(); | |
2442 | health_code_update(); | |
2443 | ||
2444 | /* Get the right consumer socket for the application. */ | |
2445 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
2446 | if (!socket) { | |
2447 | ret = -EINVAL; | |
2448 | goto error; | |
2449 | } | |
2450 | ||
2451 | health_code_update(); | |
2452 | ||
2453 | /* Need one fd for the channel. */ | |
2454 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2455 | if (ret < 0) { | |
2456 | ERR("Exhausted number of available FD upon create channel"); | |
2457 | goto error; | |
2458 | } | |
2459 | ||
2460 | /* | |
2461 | * Ask consumer to create channel. The consumer will return the number of | |
2462 | * stream we have to expect. | |
2463 | */ | |
2464 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
d2956687 | 2465 | registry, usess->current_trace_chunk); |
7972aab2 DG |
2466 | if (ret < 0) { |
2467 | goto error_ask; | |
2468 | } | |
2469 | ||
2470 | /* | |
2471 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2472 | * stream (2 being the default value here). | |
2473 | */ | |
2474 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2475 | ||
2476 | /* Reserve the amount of file descriptor we need. */ | |
2477 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2478 | if (ret < 0) { | |
2479 | ERR("Exhausted number of available FD upon create channel"); | |
2480 | goto error_fd_get_stream; | |
2481 | } | |
2482 | ||
2483 | health_code_update(); | |
2484 | ||
2485 | /* | |
2486 | * Now get the channel from the consumer. This call wil populate the stream | |
2487 | * list of that channel and set the ust objects. | |
2488 | */ | |
d9078d0c DG |
2489 | if (usess->consumer->enabled) { |
2490 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2491 | if (ret < 0) { | |
2492 | goto error_destroy; | |
2493 | } | |
7972aab2 DG |
2494 | } |
2495 | ||
2496 | rcu_read_unlock(); | |
2497 | return 0; | |
2498 | ||
2499 | error_destroy: | |
2500 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2501 | error_fd_get_stream: | |
2502 | /* | |
2503 | * Initiate a destroy channel on the consumer since we had an error | |
2504 | * handling it on our side. The return value is of no importance since we | |
2505 | * already have a ret value set by the previous error that we need to | |
2506 | * return. | |
2507 | */ | |
2508 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2509 | error_ask: | |
2510 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2511 | error: | |
2512 | health_code_update(); | |
2513 | rcu_read_unlock(); | |
2514 | return ret; | |
2515 | } | |
2516 | ||
2517 | /* | |
2518 | * Duplicate the ust data object of the ust app stream and save it in the | |
2519 | * buffer registry stream. | |
2520 | * | |
2521 | * Return 0 on success or else a negative value. | |
2522 | */ | |
2523 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2524 | struct ust_app_stream *stream) | |
2525 | { | |
2526 | int ret; | |
2527 | ||
2528 | assert(reg_stream); | |
2529 | assert(stream); | |
2530 | ||
2531 | /* Reserve the amount of file descriptor we need. */ | |
2532 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2533 | if (ret < 0) { | |
2534 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2535 | goto error; | |
2536 | } | |
2537 | ||
2538 | /* Duplicate object for stream once the original is in the registry. */ | |
2539 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2540 | reg_stream->obj.ust); | |
2541 | if (ret < 0) { | |
2542 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2543 | reg_stream->obj.ust, stream->obj, ret); | |
2544 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2545 | goto error; | |
2546 | } | |
2547 | stream->handle = stream->obj->handle; | |
2548 | ||
2549 | error: | |
2550 | return ret; | |
2551 | } | |
2552 | ||
2553 | /* | |
2554 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2555 | * buffer registry channel. | |
2556 | * | |
2557 | * Return 0 on success or else a negative value. | |
2558 | */ | |
2559 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2560 | struct ust_app_channel *ua_chan) | |
2561 | { | |
2562 | int ret; | |
2563 | ||
2564 | assert(reg_chan); | |
2565 | assert(ua_chan); | |
2566 | ||
2567 | /* Need two fds for the channel. */ | |
2568 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2569 | if (ret < 0) { | |
2570 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2571 | goto error_fd_get; | |
2572 | } | |
2573 | ||
2574 | /* Duplicate object for stream once the original is in the registry. */ | |
2575 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2576 | if (ret < 0) { | |
2577 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2578 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2579 | goto error; | |
2580 | } | |
2581 | ua_chan->handle = ua_chan->obj->handle; | |
2582 | ||
2583 | return 0; | |
2584 | ||
2585 | error: | |
2586 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2587 | error_fd_get: | |
2588 | return ret; | |
2589 | } | |
2590 | ||
2591 | /* | |
2592 | * For a given channel buffer registry, setup all streams of the given ust | |
2593 | * application channel. | |
2594 | * | |
2595 | * Return 0 on success or else a negative value. | |
2596 | */ | |
2597 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
fb45065e MD |
2598 | struct ust_app_channel *ua_chan, |
2599 | struct ust_app *app) | |
7972aab2 DG |
2600 | { |
2601 | int ret = 0; | |
2602 | struct ust_app_stream *stream, *stmp; | |
2603 | ||
2604 | assert(reg_chan); | |
2605 | assert(ua_chan); | |
2606 | ||
2607 | DBG2("UST app setup buffer registry stream"); | |
2608 | ||
2609 | /* Send all streams to application. */ | |
2610 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2611 | struct buffer_reg_stream *reg_stream; | |
2612 | ||
2613 | ret = buffer_reg_stream_create(®_stream); | |
2614 | if (ret < 0) { | |
2615 | goto error; | |
2616 | } | |
2617 | ||
2618 | /* | |
2619 | * Keep original pointer and nullify it in the stream so the delete | |
2620 | * stream call does not release the object. | |
2621 | */ | |
2622 | reg_stream->obj.ust = stream->obj; | |
2623 | stream->obj = NULL; | |
2624 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2625 | |
7972aab2 DG |
2626 | /* We don't need the streams anymore. */ |
2627 | cds_list_del(&stream->list); | |
fb45065e | 2628 | delete_ust_app_stream(-1, stream, app); |
7972aab2 | 2629 | } |
421cb601 | 2630 | |
7972aab2 DG |
2631 | error: |
2632 | return ret; | |
2633 | } | |
2634 | ||
2635 | /* | |
2636 | * Create a buffer registry channel for the given session registry and | |
2637 | * application channel object. If regp pointer is valid, it's set with the | |
2638 | * created object. Important, the created object is NOT added to the session | |
2639 | * registry hash table. | |
2640 | * | |
2641 | * Return 0 on success else a negative value. | |
2642 | */ | |
2643 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2644 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2645 | { | |
2646 | int ret; | |
2647 | struct buffer_reg_channel *reg_chan = NULL; | |
2648 | ||
2649 | assert(reg_sess); | |
2650 | assert(ua_chan); | |
2651 | ||
2652 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2653 | ||
2654 | /* Create buffer registry channel. */ | |
2655 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2656 | if (ret < 0) { | |
2657 | goto error_create; | |
421cb601 | 2658 | } |
7972aab2 DG |
2659 | assert(reg_chan); |
2660 | reg_chan->consumer_key = ua_chan->key; | |
8c924c7b | 2661 | reg_chan->subbuf_size = ua_chan->attr.subbuf_size; |
d07ceecd | 2662 | reg_chan->num_subbuf = ua_chan->attr.num_subbuf; |
421cb601 | 2663 | |
7972aab2 DG |
2664 | /* Create and add a channel registry to session. */ |
2665 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2666 | ua_chan->tracing_channel_id); | |
2667 | if (ret < 0) { | |
2668 | goto error; | |
d88aee68 | 2669 | } |
7972aab2 | 2670 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2671 | |
7972aab2 DG |
2672 | if (regp) { |
2673 | *regp = reg_chan; | |
3d8ca23b | 2674 | } |
d88aee68 | 2675 | |
7972aab2 | 2676 | return 0; |
3d8ca23b DG |
2677 | |
2678 | error: | |
7972aab2 DG |
2679 | /* Safe because the registry channel object was not added to any HT. */ |
2680 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2681 | error_create: | |
3d8ca23b | 2682 | return ret; |
421cb601 DG |
2683 | } |
2684 | ||
55cc08a6 | 2685 | /* |
7972aab2 DG |
2686 | * Setup buffer registry channel for the given session registry and application |
2687 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2688 | * |
7972aab2 | 2689 | * Return 0 on success else a negative value. |
55cc08a6 | 2690 | */ |
7972aab2 | 2691 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
fb45065e MD |
2692 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan, |
2693 | struct ust_app *app) | |
55cc08a6 | 2694 | { |
7972aab2 | 2695 | int ret; |
55cc08a6 | 2696 | |
7972aab2 DG |
2697 | assert(reg_sess); |
2698 | assert(reg_chan); | |
2699 | assert(ua_chan); | |
2700 | assert(ua_chan->obj); | |
55cc08a6 | 2701 | |
7972aab2 | 2702 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2703 | |
7972aab2 | 2704 | /* Setup all streams for the registry. */ |
fb45065e | 2705 | ret = setup_buffer_reg_streams(reg_chan, ua_chan, app); |
7972aab2 | 2706 | if (ret < 0) { |
55cc08a6 DG |
2707 | goto error; |
2708 | } | |
2709 | ||
7972aab2 DG |
2710 | reg_chan->obj.ust = ua_chan->obj; |
2711 | ua_chan->obj = NULL; | |
55cc08a6 | 2712 | |
7972aab2 | 2713 | return 0; |
55cc08a6 DG |
2714 | |
2715 | error: | |
7972aab2 DG |
2716 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2717 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2718 | return ret; |
2719 | } | |
2720 | ||
edb67388 | 2721 | /* |
7972aab2 | 2722 | * Send buffer registry channel to the application. |
d0b96690 | 2723 | * |
7972aab2 | 2724 | * Return 0 on success else a negative value. |
edb67388 | 2725 | */ |
7972aab2 DG |
2726 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2727 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2728 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2729 | { |
2730 | int ret; | |
7972aab2 | 2731 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2732 | |
7972aab2 DG |
2733 | assert(reg_chan); |
2734 | assert(app); | |
2735 | assert(ua_sess); | |
2736 | assert(ua_chan); | |
2737 | ||
2738 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2739 | ||
2740 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2741 | if (ret < 0) { |
2742 | goto error; | |
2743 | } | |
2744 | ||
7972aab2 DG |
2745 | /* Send channel to the application. */ |
2746 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
2747 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
2748 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
2749 | goto error; | |
2750 | } else if (ret < 0) { | |
7972aab2 DG |
2751 | goto error; |
2752 | } | |
2753 | ||
2754 | health_code_update(); | |
2755 | ||
2756 | /* Send all streams to application. */ | |
2757 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2758 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2759 | struct ust_app_stream stream; | |
2760 | ||
2761 | ret = duplicate_stream_object(reg_stream, &stream); | |
2762 | if (ret < 0) { | |
2763 | goto error_stream_unlock; | |
2764 | } | |
2765 | ||
2766 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2767 | if (ret < 0) { | |
fb45065e | 2768 | (void) release_ust_app_stream(-1, &stream, app); |
a7169585 MD |
2769 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
2770 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
a7169585 | 2771 | } |
7972aab2 DG |
2772 | goto error_stream_unlock; |
2773 | } | |
edb67388 | 2774 | |
7972aab2 DG |
2775 | /* |
2776 | * The return value is not important here. This function will output an | |
2777 | * error if needed. | |
2778 | */ | |
fb45065e | 2779 | (void) release_ust_app_stream(-1, &stream, app); |
7972aab2 DG |
2780 | } |
2781 | ua_chan->is_sent = 1; | |
2782 | ||
2783 | error_stream_unlock: | |
2784 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2785 | error: |
2786 | return ret; | |
2787 | } | |
2788 | ||
9730260e | 2789 | /* |
7972aab2 DG |
2790 | * Create and send to the application the created buffers with per UID buffers. |
2791 | * | |
9acdc1d6 | 2792 | * This MUST be called with a RCU read side lock acquired. |
71e0a100 | 2793 | * The session list lock and the session's lock must be acquired. |
9acdc1d6 | 2794 | * |
7972aab2 | 2795 | * Return 0 on success else a negative value. |
9730260e | 2796 | */ |
7972aab2 DG |
2797 | static int create_channel_per_uid(struct ust_app *app, |
2798 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2799 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2800 | { |
2801 | int ret; | |
7972aab2 DG |
2802 | struct buffer_reg_uid *reg_uid; |
2803 | struct buffer_reg_channel *reg_chan; | |
e32d7f27 | 2804 | struct ltt_session *session = NULL; |
e098433c JG |
2805 | enum lttng_error_code notification_ret; |
2806 | struct ust_registry_channel *chan_reg; | |
9730260e | 2807 | |
7972aab2 DG |
2808 | assert(app); |
2809 | assert(usess); | |
2810 | assert(ua_sess); | |
2811 | assert(ua_chan); | |
2812 | ||
2813 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2814 | ||
2815 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2816 | /* | |
2817 | * The session creation handles the creation of this global registry | |
2818 | * object. If none can be find, there is a code flow problem or a | |
2819 | * teardown race. | |
2820 | */ | |
2821 | assert(reg_uid); | |
2822 | ||
2823 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2824 | reg_uid); | |
2721f7ea JG |
2825 | if (reg_chan) { |
2826 | goto send_channel; | |
2827 | } | |
7972aab2 | 2828 | |
2721f7ea JG |
2829 | /* Create the buffer registry channel object. */ |
2830 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2831 | if (ret < 0) { | |
2832 | ERR("Error creating the UST channel \"%s\" registry instance", | |
f14256d6 | 2833 | ua_chan->name); |
2721f7ea JG |
2834 | goto error; |
2835 | } | |
f14256d6 | 2836 | |
e098433c JG |
2837 | session = session_find_by_id(ua_sess->tracing_id); |
2838 | assert(session); | |
2839 | assert(pthread_mutex_trylock(&session->lock)); | |
2840 | assert(session_trylock_list()); | |
2841 | ||
2721f7ea JG |
2842 | /* |
2843 | * Create the buffers on the consumer side. This call populates the | |
2844 | * ust app channel object with all streams and data object. | |
2845 | */ | |
2846 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
e098433c | 2847 | app->bits_per_long, reg_uid->registry->reg.ust, |
d2956687 | 2848 | session->most_recent_chunk_id.value); |
2721f7ea JG |
2849 | if (ret < 0) { |
2850 | ERR("Error creating UST channel \"%s\" on the consumer daemon", | |
2851 | ua_chan->name); | |
7972aab2 DG |
2852 | |
2853 | /* | |
2721f7ea JG |
2854 | * Let's remove the previously created buffer registry channel so |
2855 | * it's not visible anymore in the session registry. | |
7972aab2 | 2856 | */ |
2721f7ea JG |
2857 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, |
2858 | ua_chan->tracing_channel_id, false); | |
2859 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
2860 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2861 | goto error; | |
7972aab2 DG |
2862 | } |
2863 | ||
2721f7ea JG |
2864 | /* |
2865 | * Setup the streams and add it to the session registry. | |
2866 | */ | |
2867 | ret = setup_buffer_reg_channel(reg_uid->registry, | |
2868 | ua_chan, reg_chan, app); | |
2869 | if (ret < 0) { | |
2870 | ERR("Error setting up UST channel \"%s\"", ua_chan->name); | |
2871 | goto error; | |
2872 | } | |
2873 | ||
e098433c JG |
2874 | /* Notify the notification subsystem of the channel's creation. */ |
2875 | pthread_mutex_lock(®_uid->registry->reg.ust->lock); | |
2876 | chan_reg = ust_registry_channel_find(reg_uid->registry->reg.ust, | |
2877 | ua_chan->tracing_channel_id); | |
2878 | assert(chan_reg); | |
2879 | chan_reg->consumer_key = ua_chan->key; | |
2880 | chan_reg = NULL; | |
2881 | pthread_mutex_unlock(®_uid->registry->reg.ust->lock); | |
e9404c27 | 2882 | |
e098433c JG |
2883 | notification_ret = notification_thread_command_add_channel( |
2884 | notification_thread_handle, session->name, | |
2885 | ua_sess->euid, ua_sess->egid, | |
2886 | ua_chan->name, | |
2887 | ua_chan->key, | |
2888 | LTTNG_DOMAIN_UST, | |
2889 | ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf); | |
2890 | if (notification_ret != LTTNG_OK) { | |
2891 | ret = - (int) notification_ret; | |
2892 | ERR("Failed to add channel to notification thread"); | |
2893 | goto error; | |
e9404c27 JG |
2894 | } |
2895 | ||
2721f7ea | 2896 | send_channel: |
66ff8e3f JG |
2897 | /* Send buffers to the application. */ |
2898 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
2899 | if (ret < 0) { | |
2900 | if (ret != -ENOTCONN) { | |
2901 | ERR("Error sending channel to application"); | |
2902 | } | |
2903 | goto error; | |
2904 | } | |
2905 | ||
9730260e | 2906 | error: |
e32d7f27 JG |
2907 | if (session) { |
2908 | session_put(session); | |
2909 | } | |
9730260e DG |
2910 | return ret; |
2911 | } | |
2912 | ||
78f0bacd | 2913 | /* |
7972aab2 DG |
2914 | * Create and send to the application the created buffers with per PID buffers. |
2915 | * | |
fad1ed2f | 2916 | * Called with UST app session lock held. |
71e0a100 | 2917 | * The session list lock and the session's lock must be acquired. |
fad1ed2f | 2918 | * |
7972aab2 | 2919 | * Return 0 on success else a negative value. |
78f0bacd | 2920 | */ |
7972aab2 DG |
2921 | static int create_channel_per_pid(struct ust_app *app, |
2922 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2923 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2924 | { |
8535a6d9 | 2925 | int ret; |
7972aab2 | 2926 | struct ust_registry_session *registry; |
e9404c27 | 2927 | enum lttng_error_code cmd_ret; |
e32d7f27 | 2928 | struct ltt_session *session = NULL; |
e9404c27 JG |
2929 | uint64_t chan_reg_key; |
2930 | struct ust_registry_channel *chan_reg; | |
78f0bacd | 2931 | |
7972aab2 DG |
2932 | assert(app); |
2933 | assert(usess); | |
2934 | assert(ua_sess); | |
2935 | assert(ua_chan); | |
2936 | ||
2937 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2938 | ||
2939 | rcu_read_lock(); | |
2940 | ||
2941 | registry = get_session_registry(ua_sess); | |
fad1ed2f | 2942 | /* The UST app session lock is held, registry shall not be null. */ |
7972aab2 DG |
2943 | assert(registry); |
2944 | ||
2945 | /* Create and add a new channel registry to session. */ | |
2946 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd | 2947 | if (ret < 0) { |
f14256d6 MD |
2948 | ERR("Error creating the UST channel \"%s\" registry instance", |
2949 | ua_chan->name); | |
78f0bacd DG |
2950 | goto error; |
2951 | } | |
2952 | ||
e098433c JG |
2953 | session = session_find_by_id(ua_sess->tracing_id); |
2954 | assert(session); | |
2955 | ||
2956 | assert(pthread_mutex_trylock(&session->lock)); | |
2957 | assert(session_trylock_list()); | |
2958 | ||
7972aab2 DG |
2959 | /* Create and get channel on the consumer side. */ |
2960 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
e098433c | 2961 | app->bits_per_long, registry, |
d2956687 | 2962 | session->most_recent_chunk_id.value); |
7972aab2 | 2963 | if (ret < 0) { |
f14256d6 MD |
2964 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
2965 | ua_chan->name); | |
5b951542 | 2966 | goto error_remove_from_registry; |
7972aab2 DG |
2967 | } |
2968 | ||
2969 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
2970 | if (ret < 0) { | |
a7169585 MD |
2971 | if (ret != -ENOTCONN) { |
2972 | ERR("Error sending channel to application"); | |
2973 | } | |
5b951542 | 2974 | goto error_remove_from_registry; |
7972aab2 | 2975 | } |
8535a6d9 | 2976 | |
e9404c27 JG |
2977 | chan_reg_key = ua_chan->key; |
2978 | pthread_mutex_lock(®istry->lock); | |
2979 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
2980 | assert(chan_reg); | |
2981 | chan_reg->consumer_key = ua_chan->key; | |
2982 | pthread_mutex_unlock(®istry->lock); | |
2983 | ||
2984 | cmd_ret = notification_thread_command_add_channel( | |
2985 | notification_thread_handle, session->name, | |
2986 | ua_sess->euid, ua_sess->egid, | |
2987 | ua_chan->name, | |
2988 | ua_chan->key, | |
2989 | LTTNG_DOMAIN_UST, | |
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) { |
fc34caaa | 3145 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 3146 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
3147 | goto error; |
3148 | } | |
3149 | ||
d0b96690 | 3150 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 3151 | |
fc34caaa | 3152 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 3153 | app->pid); |
7f79d3a1 | 3154 | |
edb67388 | 3155 | end: |
fc34caaa DG |
3156 | return ret; |
3157 | ||
5b4a0ec0 | 3158 | error: |
fc34caaa | 3159 | /* Valid. Calling here is already in a read side lock */ |
fb45065e | 3160 | delete_ust_app_event(-1, ua_event, app); |
edb67388 | 3161 | return ret; |
5b4a0ec0 DG |
3162 | } |
3163 | ||
3164 | /* | |
3165 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 3166 | * |
7972aab2 | 3167 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
3168 | */ |
3169 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
ad7a9107 | 3170 | struct ust_app *app, struct consumer_output *consumer) |
5b4a0ec0 DG |
3171 | { |
3172 | int ret = 0; | |
ffe60014 | 3173 | struct ust_app_channel *metadata; |
d88aee68 | 3174 | struct consumer_socket *socket; |
7972aab2 | 3175 | struct ust_registry_session *registry; |
e32d7f27 | 3176 | struct ltt_session *session = NULL; |
5b4a0ec0 | 3177 | |
ffe60014 DG |
3178 | assert(ua_sess); |
3179 | assert(app); | |
d88aee68 | 3180 | assert(consumer); |
5b4a0ec0 | 3181 | |
7972aab2 | 3182 | registry = get_session_registry(ua_sess); |
fad1ed2f | 3183 | /* The UST app session is held registry shall not be null. */ |
7972aab2 DG |
3184 | assert(registry); |
3185 | ||
ce34fcd0 MD |
3186 | pthread_mutex_lock(®istry->lock); |
3187 | ||
1b532a60 DG |
3188 | /* Metadata already exists for this registry or it was closed previously */ |
3189 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
3190 | ret = 0; |
3191 | goto error; | |
5b4a0ec0 DG |
3192 | } |
3193 | ||
ffe60014 | 3194 | /* Allocate UST metadata */ |
d0b96690 | 3195 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
3196 | if (!metadata) { |
3197 | /* malloc() failed */ | |
3198 | ret = -ENOMEM; | |
3199 | goto error; | |
3200 | } | |
5b4a0ec0 | 3201 | |
ad7a9107 | 3202 | memcpy(&metadata->attr, &ua_sess->metadata_attr, sizeof(metadata->attr)); |
5b4a0ec0 | 3203 | |
7972aab2 DG |
3204 | /* Need one fd for the channel. */ |
3205 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
3206 | if (ret < 0) { | |
3207 | ERR("Exhausted number of available FD upon create metadata"); | |
3208 | goto error; | |
3209 | } | |
3210 | ||
4dc3dfc5 DG |
3211 | /* Get the right consumer socket for the application. */ |
3212 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
3213 | if (!socket) { | |
3214 | ret = -EINVAL; | |
3215 | goto error_consumer; | |
3216 | } | |
3217 | ||
331744e3 JD |
3218 | /* |
3219 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
3220 | * to the registry *before* we ask the consumer so we avoid the race of the | |
3221 | * consumer requesting the metadata and the ask_channel call on our side | |
3222 | * did not returned yet. | |
3223 | */ | |
3224 | registry->metadata_key = metadata->key; | |
3225 | ||
e098433c JG |
3226 | session = session_find_by_id(ua_sess->tracing_id); |
3227 | assert(session); | |
3228 | ||
3229 | assert(pthread_mutex_trylock(&session->lock)); | |
3230 | assert(session_trylock_list()); | |
3231 | ||
d88aee68 DG |
3232 | /* |
3233 | * Ask the metadata channel creation to the consumer. The metadata object | |
3234 | * will be created by the consumer and kept their. However, the stream is | |
3235 | * never added or monitored until we do a first push metadata to the | |
3236 | * consumer. | |
3237 | */ | |
7972aab2 | 3238 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
d2956687 | 3239 | registry, session->current_trace_chunk); |
d88aee68 | 3240 | if (ret < 0) { |
f2a444f1 DG |
3241 | /* Nullify the metadata key so we don't try to close it later on. */ |
3242 | registry->metadata_key = 0; | |
d88aee68 DG |
3243 | goto error_consumer; |
3244 | } | |
3245 | ||
3246 | /* | |
3247 | * The setup command will make the metadata stream be sent to the relayd, | |
3248 | * if applicable, and the thread managing the metadatas. This is important | |
3249 | * because after this point, if an error occurs, the only way the stream | |
3250 | * can be deleted is to be monitored in the consumer. | |
3251 | */ | |
7972aab2 | 3252 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 3253 | if (ret < 0) { |
f2a444f1 DG |
3254 | /* Nullify the metadata key so we don't try to close it later on. */ |
3255 | registry->metadata_key = 0; | |
d88aee68 | 3256 | goto error_consumer; |
5b4a0ec0 DG |
3257 | } |
3258 | ||
7972aab2 DG |
3259 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
3260 | metadata->key, app->pid); | |
5b4a0ec0 | 3261 | |
d88aee68 | 3262 | error_consumer: |
b80f0b6c | 3263 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 3264 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 3265 | error: |
ce34fcd0 | 3266 | pthread_mutex_unlock(®istry->lock); |
e32d7f27 JG |
3267 | if (session) { |
3268 | session_put(session); | |
3269 | } | |
ffe60014 | 3270 | return ret; |
5b4a0ec0 DG |
3271 | } |
3272 | ||
5b4a0ec0 | 3273 | /* |
d88aee68 DG |
3274 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
3275 | * acquired before calling this function. | |
5b4a0ec0 DG |
3276 | */ |
3277 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
3278 | { | |
d88aee68 | 3279 | struct ust_app *app = NULL; |
bec39940 DG |
3280 | struct lttng_ht_node_ulong *node; |
3281 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 3282 | |
bec39940 DG |
3283 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
3284 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
3285 | if (node == NULL) { |
3286 | DBG2("UST app no found with pid %d", pid); | |
3287 | goto error; | |
3288 | } | |
5b4a0ec0 DG |
3289 | |
3290 | DBG2("Found UST app by pid %d", pid); | |
3291 | ||
d88aee68 | 3292 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
3293 | |
3294 | error: | |
d88aee68 | 3295 | return app; |
5b4a0ec0 DG |
3296 | } |
3297 | ||
d88aee68 DG |
3298 | /* |
3299 | * Allocate and init an UST app object using the registration information and | |
3300 | * the command socket. This is called when the command socket connects to the | |
3301 | * session daemon. | |
3302 | * | |
3303 | * The object is returned on success or else NULL. | |
3304 | */ | |
d0b96690 | 3305 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 3306 | { |
d0b96690 DG |
3307 | struct ust_app *lta = NULL; |
3308 | ||
3309 | assert(msg); | |
3310 | assert(sock >= 0); | |
3311 | ||
3312 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 3313 | |
173af62f DG |
3314 | if ((msg->bits_per_long == 64 && |
3315 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
3316 | || (msg->bits_per_long == 32 && | |
3317 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 3318 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
3319 | "%d-bit long, but no consumerd for this size is available.\n", |
3320 | msg->name, msg->pid, msg->bits_per_long); | |
3321 | goto error; | |
3f2c5fcc | 3322 | } |
d0b96690 | 3323 | |
5b4a0ec0 DG |
3324 | lta = zmalloc(sizeof(struct ust_app)); |
3325 | if (lta == NULL) { | |
3326 | PERROR("malloc"); | |
d0b96690 | 3327 | goto error; |
5b4a0ec0 DG |
3328 | } |
3329 | ||
3330 | lta->ppid = msg->ppid; | |
3331 | lta->uid = msg->uid; | |
3332 | lta->gid = msg->gid; | |
d0b96690 | 3333 | |
7753dea8 | 3334 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
3335 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
3336 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
3337 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
3338 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
3339 | lta->long_alignment = msg->long_alignment; | |
3340 | lta->byte_order = msg->byte_order; | |
3341 | ||
5b4a0ec0 DG |
3342 | lta->v_major = msg->major; |
3343 | lta->v_minor = msg->minor; | |
d9bf3ca4 | 3344 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 | 3345 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
10b56aef | 3346 | lta->ust_sessions_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3347 | lta->notify_sock = -1; |
d88aee68 DG |
3348 | |
3349 | /* Copy name and make sure it's NULL terminated. */ | |
3350 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
3351 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
3352 | ||
3353 | /* | |
3354 | * Before this can be called, when receiving the registration information, | |
3355 | * the application compatibility is checked. So, at this point, the | |
3356 | * application can work with this session daemon. | |
3357 | */ | |
d0b96690 | 3358 | lta->compatible = 1; |
5b4a0ec0 | 3359 | |
852d0037 | 3360 | lta->pid = msg->pid; |
d0b96690 | 3361 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 3362 | lta->sock = sock; |
fb45065e | 3363 | pthread_mutex_init(<a->sock_lock, NULL); |
d0b96690 | 3364 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 3365 | |
d42f20df | 3366 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
d0b96690 DG |
3367 | error: |
3368 | return lta; | |
3369 | } | |
3370 | ||
d88aee68 DG |
3371 | /* |
3372 | * For a given application object, add it to every hash table. | |
3373 | */ | |
d0b96690 DG |
3374 | void ust_app_add(struct ust_app *app) |
3375 | { | |
3376 | assert(app); | |
3377 | assert(app->notify_sock >= 0); | |
3378 | ||
5b4a0ec0 | 3379 | rcu_read_lock(); |
852d0037 DG |
3380 | |
3381 | /* | |
3382 | * On a re-registration, we want to kick out the previous registration of | |
3383 | * that pid | |
3384 | */ | |
d0b96690 | 3385 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
3386 | |
3387 | /* | |
3388 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
3389 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
3390 | * already in the table. | |
3391 | */ | |
d0b96690 | 3392 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 3393 | |
d0b96690 DG |
3394 | /* Add application to the notify socket hash table. */ |
3395 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
3396 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 3397 | |
d0b96690 | 3398 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
3399 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
3400 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
3401 | app->v_minor); | |
5b4a0ec0 | 3402 | |
d0b96690 DG |
3403 | rcu_read_unlock(); |
3404 | } | |
3405 | ||
d88aee68 DG |
3406 | /* |
3407 | * Set the application version into the object. | |
3408 | * | |
3409 | * Return 0 on success else a negative value either an errno code or a | |
3410 | * LTTng-UST error code. | |
3411 | */ | |
d0b96690 DG |
3412 | int ust_app_version(struct ust_app *app) |
3413 | { | |
d88aee68 DG |
3414 | int ret; |
3415 | ||
d0b96690 | 3416 | assert(app); |
d88aee68 | 3417 | |
fb45065e | 3418 | pthread_mutex_lock(&app->sock_lock); |
d88aee68 | 3419 | ret = ustctl_tracer_version(app->sock, &app->version); |
fb45065e | 3420 | pthread_mutex_unlock(&app->sock_lock); |
d88aee68 DG |
3421 | if (ret < 0) { |
3422 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
5368d366 | 3423 | ERR("UST app %d version failed with ret %d", app->sock, ret); |
d88aee68 | 3424 | } else { |
5368d366 | 3425 | DBG3("UST app %d version failed. Application is dead", app->sock); |
d88aee68 DG |
3426 | } |
3427 | } | |
3428 | ||
3429 | return ret; | |
5b4a0ec0 DG |
3430 | } |
3431 | ||
3432 | /* | |
3433 | * Unregister app by removing it from the global traceable app list and freeing | |
3434 | * the data struct. | |
3435 | * | |
3436 | * The socket is already closed at this point so no close to sock. | |
3437 | */ | |
3438 | void ust_app_unregister(int sock) | |
3439 | { | |
3440 | struct ust_app *lta; | |
bec39940 | 3441 | struct lttng_ht_node_ulong *node; |
c4b88406 | 3442 | struct lttng_ht_iter ust_app_sock_iter; |
bec39940 | 3443 | struct lttng_ht_iter iter; |
d42f20df | 3444 | struct ust_app_session *ua_sess; |
525b0740 | 3445 | int ret; |
5b4a0ec0 DG |
3446 | |
3447 | rcu_read_lock(); | |
886459c6 | 3448 | |
5b4a0ec0 | 3449 | /* Get the node reference for a call_rcu */ |
c4b88406 MD |
3450 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &ust_app_sock_iter); |
3451 | node = lttng_ht_iter_get_node_ulong(&ust_app_sock_iter); | |
d0b96690 | 3452 | assert(node); |
284d8f55 | 3453 | |
852d0037 | 3454 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
3455 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
3456 | ||
d88aee68 | 3457 | /* |
ce34fcd0 MD |
3458 | * For per-PID buffers, perform "push metadata" and flush all |
3459 | * application streams before removing app from hash tables, | |
3460 | * ensuring proper behavior of data_pending check. | |
c4b88406 | 3461 | * Remove sessions so they are not visible during deletion. |
d88aee68 | 3462 | */ |
d42f20df DG |
3463 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, |
3464 | node.node) { | |
7972aab2 DG |
3465 | struct ust_registry_session *registry; |
3466 | ||
d42f20df DG |
3467 | ret = lttng_ht_del(lta->sessions, &iter); |
3468 | if (ret) { | |
3469 | /* The session was already removed so scheduled for teardown. */ | |
3470 | continue; | |
3471 | } | |
3472 | ||
ce34fcd0 MD |
3473 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { |
3474 | (void) ust_app_flush_app_session(lta, ua_sess); | |
3475 | } | |
c4b88406 | 3476 | |
d42f20df DG |
3477 | /* |
3478 | * Add session to list for teardown. This is safe since at this point we | |
3479 | * are the only one using this list. | |
3480 | */ | |
d88aee68 DG |
3481 | pthread_mutex_lock(&ua_sess->lock); |
3482 | ||
b161602a MD |
3483 | if (ua_sess->deleted) { |
3484 | pthread_mutex_unlock(&ua_sess->lock); | |
3485 | continue; | |
3486 | } | |
3487 | ||
d88aee68 DG |
3488 | /* |
3489 | * Normally, this is done in the delete session process which is | |
3490 | * executed in the call rcu below. However, upon registration we can't | |
3491 | * afford to wait for the grace period before pushing data or else the | |
3492 | * data pending feature can race between the unregistration and stop | |
3493 | * command where the data pending command is sent *before* the grace | |
3494 | * period ended. | |
3495 | * | |
3496 | * The close metadata below nullifies the metadata pointer in the | |
3497 | * session so the delete session will NOT push/close a second time. | |
3498 | */ | |
7972aab2 | 3499 | registry = get_session_registry(ua_sess); |
ce34fcd0 | 3500 | if (registry) { |
7972aab2 DG |
3501 | /* Push metadata for application before freeing the application. */ |
3502 | (void) push_metadata(registry, ua_sess->consumer); | |
3503 | ||
3504 | /* | |
3505 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
3506 | * metadata only on destroy trace session in this case. Also, the |
3507 | * previous push metadata could have flag the metadata registry to | |
3508 | * close so don't send a close command if closed. | |
7972aab2 | 3509 | */ |
ce34fcd0 | 3510 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
3511 | /* And ask to close it for this session registry. */ |
3512 | (void) close_metadata(registry, ua_sess->consumer); | |
3513 | } | |
3514 | } | |
d42f20df | 3515 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
c4b88406 | 3516 | |
d88aee68 | 3517 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
3518 | } |
3519 | ||
c4b88406 MD |
3520 | /* Remove application from PID hash table */ |
3521 | ret = lttng_ht_del(ust_app_ht_by_sock, &ust_app_sock_iter); | |
3522 | assert(!ret); | |
3523 | ||
3524 | /* | |
3525 | * Remove application from notify hash table. The thread handling the | |
3526 | * notify socket could have deleted the node so ignore on error because | |
c48239ca JG |
3527 | * either way it's valid. The close of that socket is handled by the |
3528 | * apps_notify_thread. | |
c4b88406 MD |
3529 | */ |
3530 | iter.iter.node = <a->notify_sock_n.node; | |
3531 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3532 | ||
3533 | /* | |
3534 | * Ignore return value since the node might have been removed before by an | |
3535 | * add replace during app registration because the PID can be reassigned by | |
3536 | * the OS. | |
3537 | */ | |
3538 | iter.iter.node = <a->pid_n.node; | |
3539 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3540 | if (ret) { | |
3541 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
3542 | lta->pid); | |
3543 | } | |
3544 | ||
852d0037 DG |
3545 | /* Free memory */ |
3546 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
3547 | ||
5b4a0ec0 DG |
3548 | rcu_read_unlock(); |
3549 | return; | |
284d8f55 DG |
3550 | } |
3551 | ||
5b4a0ec0 DG |
3552 | /* |
3553 | * Fill events array with all events name of all registered apps. | |
3554 | */ | |
3555 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 3556 | { |
5b4a0ec0 DG |
3557 | int ret, handle; |
3558 | size_t nbmem, count = 0; | |
bec39940 | 3559 | struct lttng_ht_iter iter; |
5b4a0ec0 | 3560 | struct ust_app *app; |
c617c0c6 | 3561 | struct lttng_event *tmp_event; |
421cb601 | 3562 | |
5b4a0ec0 | 3563 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
3564 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
3565 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
3566 | PERROR("zmalloc ust app events"); |
3567 | ret = -ENOMEM; | |
421cb601 DG |
3568 | goto error; |
3569 | } | |
3570 | ||
5b4a0ec0 | 3571 | rcu_read_lock(); |
421cb601 | 3572 | |
852d0037 | 3573 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 3574 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 3575 | |
840cb59c | 3576 | health_code_update(); |
86acf0da | 3577 | |
e0c7ec2b DG |
3578 | if (!app->compatible) { |
3579 | /* | |
3580 | * TODO: In time, we should notice the caller of this error by | |
3581 | * telling him that this is a version error. | |
3582 | */ | |
3583 | continue; | |
3584 | } | |
fb45065e | 3585 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 3586 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 3587 | if (handle < 0) { |
ffe60014 DG |
3588 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3589 | ERR("UST app list events getting handle failed for app pid %d", | |
3590 | app->pid); | |
3591 | } | |
fb45065e | 3592 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 DG |
3593 | continue; |
3594 | } | |
421cb601 | 3595 | |
852d0037 | 3596 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 3597 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3598 | /* Handle ustctl error. */ |
3599 | if (ret < 0) { | |
fb45065e MD |
3600 | int release_ret; |
3601 | ||
a2ba1ab0 | 3602 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3603 | ERR("UST app tp list get failed for app %d with ret %d", |
3604 | app->sock, ret); | |
3605 | } else { | |
3606 | DBG3("UST app tp list get failed. Application is dead"); | |
3757b385 DG |
3607 | /* |
3608 | * This is normal behavior, an application can die during the | |
3609 | * creation process. Don't report an error so the execution can | |
3610 | * continue normally. Continue normal execution. | |
3611 | */ | |
3612 | break; | |
ffe60014 | 3613 | } |
98f595d4 | 3614 | free(tmp_event); |
fb45065e | 3615 | release_ret = ustctl_release_handle(app->sock, handle); |
68313703 JG |
3616 | if (release_ret < 0 && |
3617 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3618 | release_ret != -EPIPE) { | |
fb45065e MD |
3619 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3620 | } | |
3621 | pthread_mutex_unlock(&app->sock_lock); | |
ffe60014 DG |
3622 | goto rcu_error; |
3623 | } | |
3624 | ||
840cb59c | 3625 | health_code_update(); |
815564d8 | 3626 | if (count >= nbmem) { |
d7b3776f | 3627 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3628 | struct lttng_event *new_tmp_event; |
3629 | size_t new_nbmem; | |
3630 | ||
3631 | new_nbmem = nbmem << 1; | |
3632 | DBG2("Reallocating event list from %zu to %zu entries", | |
3633 | nbmem, new_nbmem); | |
3634 | new_tmp_event = realloc(tmp_event, | |
3635 | new_nbmem * sizeof(struct lttng_event)); | |
3636 | if (new_tmp_event == NULL) { | |
fb45065e MD |
3637 | int release_ret; |
3638 | ||
5b4a0ec0 | 3639 | PERROR("realloc ust app events"); |
c617c0c6 | 3640 | free(tmp_event); |
5b4a0ec0 | 3641 | ret = -ENOMEM; |
fb45065e | 3642 | release_ret = ustctl_release_handle(app->sock, handle); |
68313703 JG |
3643 | if (release_ret < 0 && |
3644 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3645 | release_ret != -EPIPE) { | |
fb45065e MD |
3646 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3647 | } | |
3648 | pthread_mutex_unlock(&app->sock_lock); | |
5b4a0ec0 DG |
3649 | goto rcu_error; |
3650 | } | |
53efb85a MD |
3651 | /* Zero the new memory */ |
3652 | memset(new_tmp_event + nbmem, 0, | |
3653 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
3654 | nbmem = new_nbmem; | |
3655 | tmp_event = new_tmp_event; | |
5b4a0ec0 | 3656 | } |
c617c0c6 MD |
3657 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
3658 | tmp_event[count].loglevel = uiter.loglevel; | |
3659 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
3660 | tmp_event[count].pid = app->pid; | |
3661 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 3662 | count++; |
421cb601 | 3663 | } |
fb45065e MD |
3664 | ret = ustctl_release_handle(app->sock, handle); |
3665 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 | 3666 | if (ret < 0 && ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
fb45065e MD |
3667 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
3668 | } | |
421cb601 DG |
3669 | } |
3670 | ||
5b4a0ec0 | 3671 | ret = count; |
c617c0c6 | 3672 | *events = tmp_event; |
421cb601 | 3673 | |
5b4a0ec0 | 3674 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 3675 | |
5b4a0ec0 DG |
3676 | rcu_error: |
3677 | rcu_read_unlock(); | |
421cb601 | 3678 | error: |
840cb59c | 3679 | health_code_update(); |
5b4a0ec0 | 3680 | return ret; |
421cb601 DG |
3681 | } |
3682 | ||
f37d259d MD |
3683 | /* |
3684 | * Fill events array with all events name of all registered apps. | |
3685 | */ | |
3686 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
3687 | { | |
3688 | int ret, handle; | |
3689 | size_t nbmem, count = 0; | |
3690 | struct lttng_ht_iter iter; | |
3691 | struct ust_app *app; | |
c617c0c6 | 3692 | struct lttng_event_field *tmp_event; |
f37d259d MD |
3693 | |
3694 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
3695 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
3696 | if (tmp_event == NULL) { | |
f37d259d MD |
3697 | PERROR("zmalloc ust app event fields"); |
3698 | ret = -ENOMEM; | |
3699 | goto error; | |
3700 | } | |
3701 | ||
3702 | rcu_read_lock(); | |
3703 | ||
3704 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3705 | struct lttng_ust_field_iter uiter; | |
3706 | ||
840cb59c | 3707 | health_code_update(); |
86acf0da | 3708 | |
f37d259d MD |
3709 | if (!app->compatible) { |
3710 | /* | |
3711 | * TODO: In time, we should notice the caller of this error by | |
3712 | * telling him that this is a version error. | |
3713 | */ | |
3714 | continue; | |
3715 | } | |
fb45065e | 3716 | pthread_mutex_lock(&app->sock_lock); |
f37d259d MD |
3717 | handle = ustctl_tracepoint_field_list(app->sock); |
3718 | if (handle < 0) { | |
ffe60014 DG |
3719 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3720 | ERR("UST app list field getting handle failed for app pid %d", | |
3721 | app->pid); | |
3722 | } | |
fb45065e | 3723 | pthread_mutex_unlock(&app->sock_lock); |
f37d259d MD |
3724 | continue; |
3725 | } | |
3726 | ||
3727 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 3728 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3729 | /* Handle ustctl error. */ |
3730 | if (ret < 0) { | |
fb45065e MD |
3731 | int release_ret; |
3732 | ||
a2ba1ab0 | 3733 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3734 | ERR("UST app tp list field failed for app %d with ret %d", |
3735 | app->sock, ret); | |
3736 | } else { | |
3737 | DBG3("UST app tp list field failed. Application is dead"); | |
3757b385 DG |
3738 | /* |
3739 | * This is normal behavior, an application can die during the | |
3740 | * creation process. Don't report an error so the execution can | |
98f595d4 | 3741 | * continue normally. Reset list and count for next app. |
3757b385 DG |
3742 | */ |
3743 | break; | |
ffe60014 | 3744 | } |
98f595d4 | 3745 | free(tmp_event); |
fb45065e MD |
3746 | release_ret = ustctl_release_handle(app->sock, handle); |
3747 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
3748 | if (release_ret < 0 && |
3749 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3750 | release_ret != -EPIPE) { | |
fb45065e MD |
3751 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3752 | } | |
ffe60014 DG |
3753 | goto rcu_error; |
3754 | } | |
3755 | ||
840cb59c | 3756 | health_code_update(); |
f37d259d | 3757 | if (count >= nbmem) { |
d7b3776f | 3758 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3759 | struct lttng_event_field *new_tmp_event; |
3760 | size_t new_nbmem; | |
3761 | ||
3762 | new_nbmem = nbmem << 1; | |
3763 | DBG2("Reallocating event field list from %zu to %zu entries", | |
3764 | nbmem, new_nbmem); | |
3765 | new_tmp_event = realloc(tmp_event, | |
3766 | new_nbmem * sizeof(struct lttng_event_field)); | |
3767 | if (new_tmp_event == NULL) { | |
fb45065e MD |
3768 | int release_ret; |
3769 | ||
f37d259d | 3770 | PERROR("realloc ust app event fields"); |
c617c0c6 | 3771 | free(tmp_event); |
f37d259d | 3772 | ret = -ENOMEM; |
fb45065e MD |
3773 | release_ret = ustctl_release_handle(app->sock, handle); |
3774 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
3775 | if (release_ret && |
3776 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3777 | release_ret != -EPIPE) { | |
fb45065e MD |
3778 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3779 | } | |
f37d259d MD |
3780 | goto rcu_error; |
3781 | } | |
53efb85a MD |
3782 | /* Zero the new memory */ |
3783 | memset(new_tmp_event + nbmem, 0, | |
3784 | (new_nbmem - nbmem) * sizeof(struct lttng_event_field)); | |
3785 | nbmem = new_nbmem; | |
3786 | tmp_event = new_tmp_event; | |
f37d259d | 3787 | } |
f37d259d | 3788 | |
c617c0c6 | 3789 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
2e84128e DG |
3790 | /* Mapping between these enums matches 1 to 1. */ |
3791 | tmp_event[count].type = (enum lttng_event_field_type) uiter.type; | |
c617c0c6 | 3792 | tmp_event[count].nowrite = uiter.nowrite; |
f37d259d | 3793 | |
c617c0c6 MD |
3794 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
3795 | tmp_event[count].event.loglevel = uiter.loglevel; | |
2e84128e | 3796 | tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; |
c617c0c6 MD |
3797 | tmp_event[count].event.pid = app->pid; |
3798 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
3799 | count++; |
3800 | } | |
fb45065e MD |
3801 | ret = ustctl_release_handle(app->sock, handle); |
3802 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
3803 | if (ret < 0 && |
3804 | ret != -LTTNG_UST_ERR_EXITING && | |
3805 | ret != -EPIPE) { | |
fb45065e MD |
3806 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
3807 | } | |
f37d259d MD |
3808 | } |
3809 | ||
3810 | ret = count; | |
c617c0c6 | 3811 | *fields = tmp_event; |
f37d259d MD |
3812 | |
3813 | DBG2("UST app list event fields done (%zu events)", count); | |
3814 | ||
3815 | rcu_error: | |
3816 | rcu_read_unlock(); | |
3817 | error: | |
840cb59c | 3818 | health_code_update(); |
f37d259d MD |
3819 | return ret; |
3820 | } | |
3821 | ||
5b4a0ec0 DG |
3822 | /* |
3823 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
3824 | * |
3825 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
3826 | */ |
3827 | void ust_app_clean_list(void) | |
421cb601 | 3828 | { |
5b4a0ec0 | 3829 | int ret; |
659ed79f | 3830 | struct ust_app *app; |
bec39940 | 3831 | struct lttng_ht_iter iter; |
421cb601 | 3832 | |
5b4a0ec0 | 3833 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3834 | |
5b4a0ec0 | 3835 | rcu_read_lock(); |
421cb601 | 3836 | |
faadaa3a JG |
3837 | /* Cleanup notify socket hash table */ |
3838 | if (ust_app_ht_by_notify_sock) { | |
3839 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3840 | notify_sock_n.node) { | |
3841 | struct cds_lfht_node *node; | |
3842 | struct ust_app *app; | |
3843 | ||
3844 | node = cds_lfht_iter_get_node(&iter.iter); | |
3845 | if (!node) { | |
3846 | continue; | |
3847 | } | |
3848 | ||
3849 | app = container_of(node, struct ust_app, | |
3850 | notify_sock_n.node); | |
3851 | ust_app_notify_sock_unregister(app->notify_sock); | |
3852 | } | |
3853 | } | |
3854 | ||
f1b711c4 MD |
3855 | if (ust_app_ht) { |
3856 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3857 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3858 | assert(!ret); | |
3859 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
3860 | } | |
421cb601 DG |
3861 | } |
3862 | ||
852d0037 | 3863 | /* Cleanup socket hash table */ |
f1b711c4 MD |
3864 | if (ust_app_ht_by_sock) { |
3865 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, | |
3866 | sock_n.node) { | |
3867 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); | |
3868 | assert(!ret); | |
3869 | } | |
bec39940 | 3870 | } |
852d0037 | 3871 | |
36b588ed | 3872 | rcu_read_unlock(); |
d88aee68 | 3873 | |
bec39940 | 3874 | /* Destroy is done only when the ht is empty */ |
f1b711c4 MD |
3875 | if (ust_app_ht) { |
3876 | ht_cleanup_push(ust_app_ht); | |
3877 | } | |
3878 | if (ust_app_ht_by_sock) { | |
3879 | ht_cleanup_push(ust_app_ht_by_sock); | |
3880 | } | |
3881 | if (ust_app_ht_by_notify_sock) { | |
3882 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
3883 | } | |
5b4a0ec0 DG |
3884 | } |
3885 | ||
3886 | /* | |
3887 | * Init UST app hash table. | |
3888 | */ | |
57703f6e | 3889 | int ust_app_ht_alloc(void) |
5b4a0ec0 | 3890 | { |
bec39940 | 3891 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3892 | if (!ust_app_ht) { |
3893 | return -1; | |
3894 | } | |
852d0037 | 3895 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3896 | if (!ust_app_ht_by_sock) { |
3897 | return -1; | |
3898 | } | |
d0b96690 | 3899 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3900 | if (!ust_app_ht_by_notify_sock) { |
3901 | return -1; | |
3902 | } | |
3903 | return 0; | |
421cb601 DG |
3904 | } |
3905 | ||
78f0bacd DG |
3906 | /* |
3907 | * For a specific UST session, disable the channel for all registered apps. | |
3908 | */ | |
35a9059d | 3909 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3910 | struct ltt_ust_channel *uchan) |
3911 | { | |
3912 | int ret = 0; | |
bec39940 DG |
3913 | struct lttng_ht_iter iter; |
3914 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3915 | struct ust_app *app; |
3916 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3917 | struct ust_app_channel *ua_chan; |
78f0bacd | 3918 | |
88e3c2f5 | 3919 | assert(usess->active); |
d9bf3ca4 | 3920 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 3921 | uchan->name, usess->id); |
78f0bacd DG |
3922 | |
3923 | rcu_read_lock(); | |
3924 | ||
3925 | /* For every registered applications */ | |
852d0037 | 3926 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3927 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3928 | if (!app->compatible) { |
3929 | /* | |
3930 | * TODO: In time, we should notice the caller of this error by | |
3931 | * telling him that this is a version error. | |
3932 | */ | |
3933 | continue; | |
3934 | } | |
78f0bacd DG |
3935 | ua_sess = lookup_session_by_app(usess, app); |
3936 | if (ua_sess == NULL) { | |
3937 | continue; | |
3938 | } | |
3939 | ||
8535a6d9 | 3940 | /* Get channel */ |
bec39940 DG |
3941 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3942 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
3943 | /* If the session if found for the app, the channel must be there */ |
3944 | assert(ua_chan_node); | |
3945 | ||
3946 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3947 | /* The channel must not be already disabled */ | |
3948 | assert(ua_chan->enabled == 1); | |
3949 | ||
3950 | /* Disable channel onto application */ | |
3951 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
3952 | if (ret < 0) { |
3953 | /* XXX: We might want to report this error at some point... */ | |
3954 | continue; | |
3955 | } | |
3956 | } | |
3957 | ||
3958 | rcu_read_unlock(); | |
78f0bacd DG |
3959 | return ret; |
3960 | } | |
3961 | ||
3962 | /* | |
3963 | * For a specific UST session, enable the channel for all registered apps. | |
3964 | */ | |
35a9059d | 3965 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3966 | struct ltt_ust_channel *uchan) |
3967 | { | |
3968 | int ret = 0; | |
bec39940 | 3969 | struct lttng_ht_iter iter; |
78f0bacd DG |
3970 | struct ust_app *app; |
3971 | struct ust_app_session *ua_sess; | |
3972 | ||
88e3c2f5 | 3973 | assert(usess->active); |
d9bf3ca4 | 3974 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 3975 | uchan->name, usess->id); |
78f0bacd DG |
3976 | |
3977 | rcu_read_lock(); | |
3978 | ||
3979 | /* For every registered applications */ | |
852d0037 | 3980 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3981 | if (!app->compatible) { |
3982 | /* | |
3983 | * TODO: In time, we should notice the caller of this error by | |
3984 | * telling him that this is a version error. | |
3985 | */ | |
3986 | continue; | |
3987 | } | |
78f0bacd DG |
3988 | ua_sess = lookup_session_by_app(usess, app); |
3989 | if (ua_sess == NULL) { | |
3990 | continue; | |
3991 | } | |
3992 | ||
3993 | /* Enable channel onto application */ | |
3994 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
3995 | if (ret < 0) { | |
3996 | /* XXX: We might want to report this error at some point... */ | |
3997 | continue; | |
3998 | } | |
3999 | } | |
4000 | ||
4001 | rcu_read_unlock(); | |
78f0bacd DG |
4002 | return ret; |
4003 | } | |
4004 | ||
b0a40d28 DG |
4005 | /* |
4006 | * Disable an event in a channel and for a specific session. | |
4007 | */ | |
35a9059d DG |
4008 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
4009 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
4010 | { |
4011 | int ret = 0; | |
bec39940 | 4012 | struct lttng_ht_iter iter, uiter; |
700c5a9d | 4013 | struct lttng_ht_node_str *ua_chan_node; |
b0a40d28 DG |
4014 | struct ust_app *app; |
4015 | struct ust_app_session *ua_sess; | |
4016 | struct ust_app_channel *ua_chan; | |
4017 | struct ust_app_event *ua_event; | |
4018 | ||
88e3c2f5 | 4019 | assert(usess->active); |
b0a40d28 | 4020 | DBG("UST app disabling event %s for all apps in channel " |
d9bf3ca4 MD |
4021 | "%s for session id %" PRIu64, |
4022 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
4023 | |
4024 | rcu_read_lock(); | |
4025 | ||
4026 | /* For all registered applications */ | |
852d0037 | 4027 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4028 | if (!app->compatible) { |
4029 | /* | |
4030 | * TODO: In time, we should notice the caller of this error by | |
4031 | * telling him that this is a version error. | |
4032 | */ | |
4033 | continue; | |
4034 | } | |
b0a40d28 DG |
4035 | ua_sess = lookup_session_by_app(usess, app); |
4036 | if (ua_sess == NULL) { | |
4037 | /* Next app */ | |
4038 | continue; | |
4039 | } | |
4040 | ||
4041 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
4042 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4043 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 4044 | if (ua_chan_node == NULL) { |
d9bf3ca4 | 4045 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 4046 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
4047 | continue; |
4048 | } | |
4049 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4050 | ||
700c5a9d JR |
4051 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
4052 | uevent->filter, uevent->attr.loglevel, | |
4053 | uevent->exclusion); | |
4054 | if (ua_event == NULL) { | |
b0a40d28 | 4055 | DBG2("Event %s not found in channel %s for app pid %d." |
852d0037 | 4056 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
4057 | continue; |
4058 | } | |
b0a40d28 | 4059 | |
7f79d3a1 | 4060 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
4061 | if (ret < 0) { |
4062 | /* XXX: Report error someday... */ | |
4063 | continue; | |
4064 | } | |
4065 | } | |
4066 | ||
4067 | rcu_read_unlock(); | |
88e3c2f5 JG |
4068 | return ret; |
4069 | } | |
4070 | ||
4071 | /* The ua_sess lock must be held by the caller. */ | |
4072 | static | |
4073 | int ust_app_channel_create(struct ltt_ust_session *usess, | |
4074 | struct ust_app_session *ua_sess, | |
4075 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
4076 | struct ust_app_channel **_ua_chan) | |
4077 | { | |
4078 | int ret = 0; | |
4079 | struct ust_app_channel *ua_chan = NULL; | |
4080 | ||
4081 | assert(ua_sess); | |
4082 | ASSERT_LOCKED(ua_sess->lock); | |
4083 | ||
4084 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, | |
4085 | sizeof(uchan->name))) { | |
4086 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, | |
4087 | &uchan->attr); | |
4088 | ret = 0; | |
4089 | } else { | |
4090 | struct ltt_ust_context *uctx = NULL; | |
4091 | ||
4092 | /* | |
4093 | * Create channel onto application and synchronize its | |
4094 | * configuration. | |
4095 | */ | |
4096 | ret = ust_app_channel_allocate(ua_sess, uchan, | |
4097 | LTTNG_UST_CHAN_PER_CPU, usess, | |
4098 | &ua_chan); | |
4099 | if (ret == 0) { | |
4100 | ret = ust_app_channel_send(app, usess, | |
4101 | ua_sess, ua_chan); | |
4102 | } else { | |
4103 | goto end; | |
4104 | } | |
4105 | ||
4106 | /* Add contexts. */ | |
4107 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { | |
4108 | ret = create_ust_app_channel_context(ua_chan, | |
4109 | &uctx->ctx, app); | |
4110 | if (ret) { | |
4111 | goto end; | |
4112 | } | |
4113 | } | |
4114 | } | |
4115 | if (ret < 0) { | |
4116 | switch (ret) { | |
4117 | case -ENOTCONN: | |
4118 | /* | |
4119 | * The application's socket is not valid. Either a bad socket | |
4120 | * or a timeout on it. We can't inform the caller that for a | |
4121 | * specific app, the session failed so lets continue here. | |
4122 | */ | |
4123 | ret = 0; /* Not an error. */ | |
4124 | break; | |
4125 | case -ENOMEM: | |
4126 | default: | |
4127 | break; | |
4128 | } | |
4129 | } | |
0498a00c | 4130 | end: |
88e3c2f5 JG |
4131 | if (ret == 0 && _ua_chan) { |
4132 | /* | |
4133 | * Only return the application's channel on success. Note | |
4134 | * that the channel can still be part of the application's | |
4135 | * channel hashtable on error. | |
4136 | */ | |
4137 | *_ua_chan = ua_chan; | |
4138 | } | |
b0a40d28 DG |
4139 | return ret; |
4140 | } | |
4141 | ||
421cb601 | 4142 | /* |
5b4a0ec0 | 4143 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 4144 | */ |
35a9059d | 4145 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
4146 | struct ltt_ust_channel *uchan) |
4147 | { | |
88e3c2f5 JG |
4148 | int ret = 0; |
4149 | struct cds_lfht_iter iter; | |
48842b30 | 4150 | struct ust_app *app; |
48842b30 | 4151 | |
fc34caaa | 4152 | assert(usess); |
88e3c2f5 | 4153 | assert(usess->active); |
fc34caaa | 4154 | assert(uchan); |
421cb601 | 4155 | |
d9bf3ca4 | 4156 | DBG2("UST app adding channel %s to UST domain for session id %" PRIu64, |
a991f516 | 4157 | uchan->name, usess->id); |
48842b30 DG |
4158 | |
4159 | rcu_read_lock(); | |
5b4a0ec0 | 4160 | /* For every registered applications */ |
88e3c2f5 JG |
4161 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter, app, pid_n.node) { |
4162 | struct ust_app_session *ua_sess; | |
4163 | int session_was_created = 0; | |
4164 | ||
4165 | if (!app->compatible || | |
4166 | !trace_ust_pid_tracker_lookup(usess, app->pid)) { | |
4167 | goto error_rcu_unlock; | |
a9ad0c8f MD |
4168 | } |
4169 | ||
edb67388 DG |
4170 | /* |
4171 | * Create session on the tracer side and add it to app session HT. Note | |
4172 | * that if session exist, it will simply return a pointer to the ust | |
4173 | * app session. | |
4174 | */ | |
88e3c2f5 JG |
4175 | ret = find_or_create_ust_app_session(usess, app, &ua_sess, |
4176 | &session_was_created); | |
3d8ca23b DG |
4177 | if (ret < 0) { |
4178 | switch (ret) { | |
4179 | case -ENOTCONN: | |
4180 | /* | |
88e3c2f5 JG |
4181 | * The application's socket is not valid. Either a bad |
4182 | * socket or a timeout on it. We can't inform the caller | |
4183 | * that for a specific app, the session failed so lets | |
4184 | * continue here; it is not an error. | |
3d8ca23b | 4185 | */ |
88e3c2f5 JG |
4186 | ret = 0; |
4187 | goto error_rcu_unlock; | |
3d8ca23b DG |
4188 | case -ENOMEM: |
4189 | default: | |
4190 | goto error_rcu_unlock; | |
4191 | } | |
48842b30 | 4192 | } |
b161602a MD |
4193 | |
4194 | if (ua_sess->deleted) { | |
b161602a MD |
4195 | continue; |
4196 | } | |
88e3c2f5 JG |
4197 | ret = ust_app_channel_create(usess, ua_sess, uchan, app, NULL); |
4198 | if (ret) { | |
4199 | if (session_was_created) { | |
d0b96690 | 4200 | destroy_app_session(app, ua_sess); |
3d8ca23b | 4201 | } |
88e3c2f5 | 4202 | goto error_rcu_unlock; |
48842b30 | 4203 | } |
48842b30 | 4204 | } |
5b4a0ec0 | 4205 | |
95e047ff | 4206 | error_rcu_unlock: |
48842b30 | 4207 | rcu_read_unlock(); |
3c14c33f | 4208 | return ret; |
48842b30 DG |
4209 | } |
4210 | ||
5b4a0ec0 | 4211 | /* |
edb67388 | 4212 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 4213 | */ |
35a9059d | 4214 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
4215 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4216 | { | |
4217 | int ret = 0; | |
bec39940 | 4218 | struct lttng_ht_iter iter, uiter; |
18eace3b | 4219 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
4220 | struct ust_app *app; |
4221 | struct ust_app_session *ua_sess; | |
4222 | struct ust_app_channel *ua_chan; | |
4223 | struct ust_app_event *ua_event; | |
48842b30 | 4224 | |
88e3c2f5 | 4225 | assert(usess->active); |
d9bf3ca4 | 4226 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 4227 | uevent->attr.name, usess->id); |
48842b30 | 4228 | |
edb67388 DG |
4229 | /* |
4230 | * NOTE: At this point, this function is called only if the session and | |
4231 | * channel passed are already created for all apps. and enabled on the | |
4232 | * tracer also. | |
4233 | */ | |
4234 | ||
48842b30 | 4235 | rcu_read_lock(); |
421cb601 DG |
4236 | |
4237 | /* For all registered applications */ | |
852d0037 | 4238 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4239 | if (!app->compatible) { |
4240 | /* | |
4241 | * TODO: In time, we should notice the caller of this error by | |
4242 | * telling him that this is a version error. | |
4243 | */ | |
4244 | continue; | |
4245 | } | |
edb67388 | 4246 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4247 | if (!ua_sess) { |
4248 | /* The application has problem or is probably dead. */ | |
4249 | continue; | |
4250 | } | |
ba767faf | 4251 | |
d0b96690 DG |
4252 | pthread_mutex_lock(&ua_sess->lock); |
4253 | ||
b161602a MD |
4254 | if (ua_sess->deleted) { |
4255 | pthread_mutex_unlock(&ua_sess->lock); | |
4256 | continue; | |
4257 | } | |
4258 | ||
edb67388 | 4259 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4260 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4261 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
a7169585 MD |
4262 | /* |
4263 | * It is possible that the channel cannot be found is | |
4264 | * the channel/event creation occurs concurrently with | |
4265 | * an application exit. | |
4266 | */ | |
4267 | if (!ua_chan_node) { | |
4268 | pthread_mutex_unlock(&ua_sess->lock); | |
4269 | continue; | |
4270 | } | |
edb67388 DG |
4271 | |
4272 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4273 | ||
18eace3b DG |
4274 | /* Get event node */ |
4275 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
39c5a3a7 | 4276 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 4277 | if (ua_event == NULL) { |
7f79d3a1 | 4278 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 4279 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 4280 | goto next_app; |
35a9059d | 4281 | } |
35a9059d DG |
4282 | |
4283 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
4284 | if (ret < 0) { | |
d0b96690 | 4285 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 4286 | goto error; |
48842b30 | 4287 | } |
d0b96690 DG |
4288 | next_app: |
4289 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
4290 | } |
4291 | ||
7f79d3a1 | 4292 | error: |
edb67388 | 4293 | rcu_read_unlock(); |
edb67388 DG |
4294 | return ret; |
4295 | } | |
4296 | ||
4297 | /* | |
4298 | * For a specific existing UST session and UST channel, creates the event for | |
4299 | * all registered apps. | |
4300 | */ | |
35a9059d | 4301 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
4302 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4303 | { | |
4304 | int ret = 0; | |
bec39940 DG |
4305 | struct lttng_ht_iter iter, uiter; |
4306 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
4307 | struct ust_app *app; |
4308 | struct ust_app_session *ua_sess; | |
4309 | struct ust_app_channel *ua_chan; | |
4310 | ||
88e3c2f5 | 4311 | assert(usess->active); |
d9bf3ca4 | 4312 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 4313 | uevent->attr.name, usess->id); |
edb67388 | 4314 | |
edb67388 DG |
4315 | rcu_read_lock(); |
4316 | ||
4317 | /* For all registered applications */ | |
852d0037 | 4318 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4319 | if (!app->compatible) { |
4320 | /* | |
4321 | * TODO: In time, we should notice the caller of this error by | |
4322 | * telling him that this is a version error. | |
4323 | */ | |
4324 | continue; | |
4325 | } | |
edb67388 | 4326 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4327 | if (!ua_sess) { |
4328 | /* The application has problem or is probably dead. */ | |
4329 | continue; | |
4330 | } | |
48842b30 | 4331 | |
d0b96690 | 4332 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
4333 | |
4334 | if (ua_sess->deleted) { | |
4335 | pthread_mutex_unlock(&ua_sess->lock); | |
4336 | continue; | |
4337 | } | |
4338 | ||
48842b30 | 4339 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4340 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4341 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
4342 | /* If the channel is not found, there is a code flow error */ |
4343 | assert(ua_chan_node); | |
4344 | ||
48842b30 DG |
4345 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
4346 | ||
edb67388 | 4347 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 4348 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 4349 | if (ret < 0) { |
49c336c1 | 4350 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
4351 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
4352 | break; | |
4353 | } | |
4354 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 4355 | uevent->attr.name, app->pid); |
5b4a0ec0 | 4356 | continue; |
48842b30 | 4357 | } |
48842b30 | 4358 | } |
5b4a0ec0 | 4359 | |
48842b30 | 4360 | rcu_read_unlock(); |
48842b30 DG |
4361 | return ret; |
4362 | } | |
4363 | ||
5b4a0ec0 DG |
4364 | /* |
4365 | * Start tracing for a specific UST session and app. | |
fad1ed2f JR |
4366 | * |
4367 | * Called with UST app session lock held. | |
4368 | * | |
5b4a0ec0 | 4369 | */ |
b34cbebf | 4370 | static |
421cb601 | 4371 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
4372 | { |
4373 | int ret = 0; | |
48842b30 | 4374 | struct ust_app_session *ua_sess; |
48842b30 | 4375 | |
852d0037 | 4376 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 4377 | |
509cbaf8 MD |
4378 | rcu_read_lock(); |
4379 | ||
e0c7ec2b DG |
4380 | if (!app->compatible) { |
4381 | goto end; | |
4382 | } | |
4383 | ||
421cb601 DG |
4384 | ua_sess = lookup_session_by_app(usess, app); |
4385 | if (ua_sess == NULL) { | |
d42f20df DG |
4386 | /* The session is in teardown process. Ignore and continue. */ |
4387 | goto end; | |
421cb601 | 4388 | } |
48842b30 | 4389 | |
d0b96690 DG |
4390 | pthread_mutex_lock(&ua_sess->lock); |
4391 | ||
b161602a MD |
4392 | if (ua_sess->deleted) { |
4393 | pthread_mutex_unlock(&ua_sess->lock); | |
4394 | goto end; | |
4395 | } | |
4396 | ||
aea829b3 DG |
4397 | /* Upon restart, we skip the setup, already done */ |
4398 | if (ua_sess->started) { | |
8be98f9a | 4399 | goto skip_setup; |
aea829b3 | 4400 | } |
8be98f9a | 4401 | |
d65d2de8 DG |
4402 | /* |
4403 | * Create the metadata for the application. This returns gracefully if a | |
4404 | * metadata was already set for the session. | |
4405 | */ | |
ad7a9107 | 4406 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer); |
421cb601 | 4407 | if (ret < 0) { |
d0b96690 | 4408 | goto error_unlock; |
421cb601 | 4409 | } |
48842b30 | 4410 | |
840cb59c | 4411 | health_code_update(); |
86acf0da | 4412 | |
8be98f9a | 4413 | skip_setup: |
421cb601 | 4414 | /* This start the UST tracing */ |
fb45065e | 4415 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4416 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
fb45065e | 4417 | pthread_mutex_unlock(&app->sock_lock); |
421cb601 | 4418 | if (ret < 0) { |
ffe60014 DG |
4419 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4420 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
4421 | app->pid, ret); | |
4422 | } else { | |
4423 | DBG("UST app start session failed. Application is dead."); | |
3757b385 DG |
4424 | /* |
4425 | * This is normal behavior, an application can die during the | |
4426 | * creation process. Don't report an error so the execution can | |
4427 | * continue normally. | |
4428 | */ | |
4429 | pthread_mutex_unlock(&ua_sess->lock); | |
4430 | goto end; | |
ffe60014 | 4431 | } |
d0b96690 | 4432 | goto error_unlock; |
421cb601 | 4433 | } |
5b4a0ec0 | 4434 | |
55c3953d DG |
4435 | /* Indicate that the session has been started once */ |
4436 | ua_sess->started = 1; | |
4437 | ||
d0b96690 DG |
4438 | pthread_mutex_unlock(&ua_sess->lock); |
4439 | ||
840cb59c | 4440 | health_code_update(); |
86acf0da | 4441 | |
421cb601 | 4442 | /* Quiescent wait after starting trace */ |
fb45065e | 4443 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4444 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4445 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4446 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4447 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4448 | app->pid, ret); | |
4449 | } | |
48842b30 | 4450 | |
e0c7ec2b DG |
4451 | end: |
4452 | rcu_read_unlock(); | |
840cb59c | 4453 | health_code_update(); |
421cb601 | 4454 | return 0; |
48842b30 | 4455 | |
d0b96690 DG |
4456 | error_unlock: |
4457 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 4458 | rcu_read_unlock(); |
840cb59c | 4459 | health_code_update(); |
421cb601 DG |
4460 | return -1; |
4461 | } | |
48842b30 | 4462 | |
8be98f9a MD |
4463 | /* |
4464 | * Stop tracing for a specific UST session and app. | |
4465 | */ | |
b34cbebf | 4466 | static |
8be98f9a MD |
4467 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
4468 | { | |
4469 | int ret = 0; | |
4470 | struct ust_app_session *ua_sess; | |
7972aab2 | 4471 | struct ust_registry_session *registry; |
8be98f9a | 4472 | |
852d0037 | 4473 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
4474 | |
4475 | rcu_read_lock(); | |
4476 | ||
e0c7ec2b | 4477 | if (!app->compatible) { |
d88aee68 | 4478 | goto end_no_session; |
e0c7ec2b DG |
4479 | } |
4480 | ||
8be98f9a MD |
4481 | ua_sess = lookup_session_by_app(usess, app); |
4482 | if (ua_sess == NULL) { | |
d88aee68 | 4483 | goto end_no_session; |
8be98f9a MD |
4484 | } |
4485 | ||
d88aee68 DG |
4486 | pthread_mutex_lock(&ua_sess->lock); |
4487 | ||
b161602a MD |
4488 | if (ua_sess->deleted) { |
4489 | pthread_mutex_unlock(&ua_sess->lock); | |
4490 | goto end_no_session; | |
4491 | } | |
4492 | ||
9bc07046 DG |
4493 | /* |
4494 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
4495 | * that was never started. It's possible since we can have a fail start |
4496 | * from either the application manager thread or the command thread. Simply | |
4497 | * indicate that this is a stop error. | |
9bc07046 | 4498 | */ |
f9dfc3d9 | 4499 | if (!ua_sess->started) { |
c45536e1 DG |
4500 | goto error_rcu_unlock; |
4501 | } | |
7db205b5 | 4502 | |
840cb59c | 4503 | health_code_update(); |
86acf0da | 4504 | |
9d6c7d3f | 4505 | /* This inhibits UST tracing */ |
fb45065e | 4506 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4507 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
fb45065e | 4508 | pthread_mutex_unlock(&app->sock_lock); |
9d6c7d3f | 4509 | if (ret < 0) { |
ffe60014 DG |
4510 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4511 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
4512 | app->pid, ret); | |
4513 | } else { | |
4514 | DBG("UST app stop session failed. Application is dead."); | |
3757b385 DG |
4515 | /* |
4516 | * This is normal behavior, an application can die during the | |
4517 | * creation process. Don't report an error so the execution can | |
4518 | * continue normally. | |
4519 | */ | |
4520 | goto end_unlock; | |
ffe60014 | 4521 | } |
9d6c7d3f DG |
4522 | goto error_rcu_unlock; |
4523 | } | |
4524 | ||
840cb59c | 4525 | health_code_update(); |
86acf0da | 4526 | |
9d6c7d3f | 4527 | /* Quiescent wait after stopping trace */ |
fb45065e | 4528 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4529 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4530 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4531 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4532 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4533 | app->pid, ret); | |
4534 | } | |
9d6c7d3f | 4535 | |
840cb59c | 4536 | health_code_update(); |
86acf0da | 4537 | |
b34cbebf | 4538 | registry = get_session_registry(ua_sess); |
fad1ed2f JR |
4539 | |
4540 | /* The UST app session is held registry shall not be null. */ | |
b34cbebf | 4541 | assert(registry); |
1b532a60 | 4542 | |
ce34fcd0 MD |
4543 | /* Push metadata for application before freeing the application. */ |
4544 | (void) push_metadata(registry, ua_sess->consumer); | |
b34cbebf | 4545 | |
3757b385 | 4546 | end_unlock: |
b34cbebf MD |
4547 | pthread_mutex_unlock(&ua_sess->lock); |
4548 | end_no_session: | |
4549 | rcu_read_unlock(); | |
4550 | health_code_update(); | |
4551 | return 0; | |
4552 | ||
4553 | error_rcu_unlock: | |
4554 | pthread_mutex_unlock(&ua_sess->lock); | |
4555 | rcu_read_unlock(); | |
4556 | health_code_update(); | |
4557 | return -1; | |
4558 | } | |
4559 | ||
b34cbebf | 4560 | static |
c4b88406 MD |
4561 | int ust_app_flush_app_session(struct ust_app *app, |
4562 | struct ust_app_session *ua_sess) | |
b34cbebf | 4563 | { |
c4b88406 | 4564 | int ret, retval = 0; |
b34cbebf | 4565 | struct lttng_ht_iter iter; |
b34cbebf | 4566 | struct ust_app_channel *ua_chan; |
c4b88406 | 4567 | struct consumer_socket *socket; |
b34cbebf | 4568 | |
c4b88406 | 4569 | DBG("Flushing app session buffers for ust app pid %d", app->pid); |
b34cbebf MD |
4570 | |
4571 | rcu_read_lock(); | |
4572 | ||
4573 | if (!app->compatible) { | |
c4b88406 | 4574 | goto end_not_compatible; |
b34cbebf MD |
4575 | } |
4576 | ||
4577 | pthread_mutex_lock(&ua_sess->lock); | |
4578 | ||
b161602a MD |
4579 | if (ua_sess->deleted) { |
4580 | goto end_deleted; | |
4581 | } | |
4582 | ||
b34cbebf MD |
4583 | health_code_update(); |
4584 | ||
9d6c7d3f | 4585 | /* Flushing buffers */ |
c4b88406 MD |
4586 | socket = consumer_find_socket_by_bitness(app->bits_per_long, |
4587 | ua_sess->consumer); | |
ce34fcd0 MD |
4588 | |
4589 | /* Flush buffers and push metadata. */ | |
4590 | switch (ua_sess->buffer_type) { | |
4591 | case LTTNG_BUFFER_PER_PID: | |
4592 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, | |
4593 | node.node) { | |
4594 | health_code_update(); | |
ce34fcd0 MD |
4595 | ret = consumer_flush_channel(socket, ua_chan->key); |
4596 | if (ret) { | |
4597 | ERR("Error flushing consumer channel"); | |
4598 | retval = -1; | |
4599 | continue; | |
4600 | } | |
8be98f9a | 4601 | } |
ce34fcd0 MD |
4602 | break; |
4603 | case LTTNG_BUFFER_PER_UID: | |
4604 | default: | |
4605 | assert(0); | |
4606 | break; | |
8be98f9a | 4607 | } |
8be98f9a | 4608 | |
840cb59c | 4609 | health_code_update(); |
86acf0da | 4610 | |
b161602a | 4611 | end_deleted: |
d88aee68 | 4612 | pthread_mutex_unlock(&ua_sess->lock); |
ce34fcd0 | 4613 | |
c4b88406 MD |
4614 | end_not_compatible: |
4615 | rcu_read_unlock(); | |
4616 | health_code_update(); | |
4617 | return retval; | |
4618 | } | |
4619 | ||
4620 | /* | |
ce34fcd0 MD |
4621 | * Flush buffers for all applications for a specific UST session. |
4622 | * Called with UST session lock held. | |
c4b88406 MD |
4623 | */ |
4624 | static | |
ce34fcd0 | 4625 | int ust_app_flush_session(struct ltt_ust_session *usess) |
c4b88406 MD |
4626 | |
4627 | { | |
99b1411c | 4628 | int ret = 0; |
c4b88406 | 4629 | |
ce34fcd0 | 4630 | DBG("Flushing session buffers for all ust apps"); |
c4b88406 MD |
4631 | |
4632 | rcu_read_lock(); | |
4633 | ||
ce34fcd0 MD |
4634 | /* Flush buffers and push metadata. */ |
4635 | switch (usess->buffer_type) { | |
4636 | case LTTNG_BUFFER_PER_UID: | |
4637 | { | |
4638 | struct buffer_reg_uid *reg; | |
4639 | struct lttng_ht_iter iter; | |
4640 | ||
4641 | /* Flush all per UID buffers associated to that session. */ | |
4642 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
4643 | struct ust_registry_session *ust_session_reg; | |
4644 | struct buffer_reg_channel *reg_chan; | |
4645 | struct consumer_socket *socket; | |
4646 | ||
4647 | /* Get consumer socket to use to push the metadata.*/ | |
4648 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
4649 | usess->consumer); | |
4650 | if (!socket) { | |
4651 | /* Ignore request if no consumer is found for the session. */ | |
4652 | continue; | |
4653 | } | |
4654 | ||
4655 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
4656 | reg_chan, node.node) { | |
4657 | /* | |
4658 | * The following call will print error values so the return | |
4659 | * code is of little importance because whatever happens, we | |
4660 | * have to try them all. | |
4661 | */ | |
4662 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
4663 | } | |
4664 | ||
4665 | ust_session_reg = reg->registry->reg.ust; | |
4666 | /* Push metadata. */ | |
4667 | (void) push_metadata(ust_session_reg, usess->consumer); | |
4668 | } | |
ce34fcd0 MD |
4669 | break; |
4670 | } | |
4671 | case LTTNG_BUFFER_PER_PID: | |
4672 | { | |
4673 | struct ust_app_session *ua_sess; | |
4674 | struct lttng_ht_iter iter; | |
4675 | struct ust_app *app; | |
4676 | ||
4677 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4678 | ua_sess = lookup_session_by_app(usess, app); | |
4679 | if (ua_sess == NULL) { | |
4680 | continue; | |
4681 | } | |
4682 | (void) ust_app_flush_app_session(app, ua_sess); | |
4683 | } | |
4684 | break; | |
4685 | } | |
4686 | default: | |
99b1411c | 4687 | ret = -1; |
ce34fcd0 MD |
4688 | assert(0); |
4689 | break; | |
c4b88406 | 4690 | } |
c4b88406 | 4691 | |
7db205b5 | 4692 | rcu_read_unlock(); |
840cb59c | 4693 | health_code_update(); |
c4b88406 | 4694 | return ret; |
8be98f9a MD |
4695 | } |
4696 | ||
0dd01979 MD |
4697 | static |
4698 | int ust_app_clear_quiescent_app_session(struct ust_app *app, | |
4699 | struct ust_app_session *ua_sess) | |
4700 | { | |
4701 | int ret = 0; | |
4702 | struct lttng_ht_iter iter; | |
4703 | struct ust_app_channel *ua_chan; | |
4704 | struct consumer_socket *socket; | |
4705 | ||
4706 | DBG("Clearing stream quiescent state for ust app pid %d", app->pid); | |
4707 | ||
4708 | rcu_read_lock(); | |
4709 | ||
4710 | if (!app->compatible) { | |
4711 | goto end_not_compatible; | |
4712 | } | |
4713 | ||
4714 | pthread_mutex_lock(&ua_sess->lock); | |
4715 | ||
4716 | if (ua_sess->deleted) { | |
4717 | goto end_unlock; | |
4718 | } | |
4719 | ||
4720 | health_code_update(); | |
4721 | ||
4722 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
4723 | ua_sess->consumer); | |
4724 | if (!socket) { | |
4725 | ERR("Failed to find consumer (%" PRIu32 ") socket", | |
4726 | app->bits_per_long); | |
4727 | ret = -1; | |
4728 | goto end_unlock; | |
4729 | } | |
4730 | ||
4731 | /* Clear quiescent state. */ | |
4732 | switch (ua_sess->buffer_type) { | |
4733 | case LTTNG_BUFFER_PER_PID: | |
4734 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, | |
4735 | ua_chan, node.node) { | |
4736 | health_code_update(); | |
4737 | ret = consumer_clear_quiescent_channel(socket, | |
4738 | ua_chan->key); | |
4739 | if (ret) { | |
4740 | ERR("Error clearing quiescent state for consumer channel"); | |
4741 | ret = -1; | |
4742 | continue; | |
4743 | } | |
4744 | } | |
4745 | break; | |
4746 | case LTTNG_BUFFER_PER_UID: | |
4747 | default: | |
4748 | assert(0); | |
4749 | ret = -1; | |
4750 | break; | |
4751 | } | |
4752 | ||
4753 | health_code_update(); | |
4754 | ||
4755 | end_unlock: | |
4756 | pthread_mutex_unlock(&ua_sess->lock); | |
4757 | ||
4758 | end_not_compatible: | |
4759 | rcu_read_unlock(); | |
4760 | health_code_update(); | |
4761 | return ret; | |
4762 | } | |
4763 | ||
4764 | /* | |
4765 | * Clear quiescent state in each stream for all applications for a | |
4766 | * specific UST session. | |
4767 | * Called with UST session lock held. | |
4768 | */ | |
4769 | static | |
4770 | int ust_app_clear_quiescent_session(struct ltt_ust_session *usess) | |
4771 | ||
4772 | { | |
4773 | int ret = 0; | |
4774 | ||
4775 | DBG("Clearing stream quiescent state for all ust apps"); | |
4776 | ||
4777 | rcu_read_lock(); | |
4778 | ||
4779 | switch (usess->buffer_type) { | |
4780 | case LTTNG_BUFFER_PER_UID: | |
4781 | { | |
4782 | struct lttng_ht_iter iter; | |
4783 | struct buffer_reg_uid *reg; | |
4784 | ||
4785 | /* | |
4786 | * Clear quiescent for all per UID buffers associated to | |
4787 | * that session. | |
4788 | */ | |
4789 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
4790 | struct consumer_socket *socket; | |
4791 | struct buffer_reg_channel *reg_chan; | |
4792 | ||
4793 | /* Get associated consumer socket.*/ | |
4794 | socket = consumer_find_socket_by_bitness( | |
4795 | reg->bits_per_long, usess->consumer); | |
4796 | if (!socket) { | |
4797 | /* | |
4798 | * Ignore request if no consumer is found for | |
4799 | * the session. | |
4800 | */ | |
4801 | continue; | |
4802 | } | |
4803 | ||
4804 | cds_lfht_for_each_entry(reg->registry->channels->ht, | |
4805 | &iter.iter, reg_chan, node.node) { | |
4806 | /* | |
4807 | * The following call will print error values so | |
4808 | * the return code is of little importance | |
4809 | * because whatever happens, we have to try them | |
4810 | * all. | |
4811 | */ | |
4812 | (void) consumer_clear_quiescent_channel(socket, | |
4813 | reg_chan->consumer_key); | |
4814 | } | |
4815 | } | |
4816 | break; | |
4817 | } | |
4818 | case LTTNG_BUFFER_PER_PID: | |
4819 | { | |
4820 | struct ust_app_session *ua_sess; | |
4821 | struct lttng_ht_iter iter; | |
4822 | struct ust_app *app; | |
4823 | ||
4824 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, | |
4825 | pid_n.node) { | |
4826 | ua_sess = lookup_session_by_app(usess, app); | |
4827 | if (ua_sess == NULL) { | |
4828 | continue; | |
4829 | } | |
4830 | (void) ust_app_clear_quiescent_app_session(app, | |
4831 | ua_sess); | |
4832 | } | |
4833 | break; | |
4834 | } | |
4835 | default: | |
4836 | ret = -1; | |
4837 | assert(0); | |
4838 | break; | |
4839 | } | |
4840 | ||
4841 | rcu_read_unlock(); | |
4842 | health_code_update(); | |
4843 | return ret; | |
4844 | } | |
4845 | ||
84cd17c6 MD |
4846 | /* |
4847 | * Destroy a specific UST session in apps. | |
4848 | */ | |
3353de95 | 4849 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 4850 | { |
ffe60014 | 4851 | int ret; |
84cd17c6 | 4852 | struct ust_app_session *ua_sess; |
bec39940 | 4853 | struct lttng_ht_iter iter; |
d9bf3ca4 | 4854 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 4855 | |
852d0037 | 4856 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
4857 | |
4858 | rcu_read_lock(); | |
4859 | ||
e0c7ec2b DG |
4860 | if (!app->compatible) { |
4861 | goto end; | |
4862 | } | |
4863 | ||
84cd17c6 | 4864 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 4865 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 4866 | if (node == NULL) { |
d42f20df DG |
4867 | /* Session is being or is deleted. */ |
4868 | goto end; | |
84cd17c6 MD |
4869 | } |
4870 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 4871 | |
840cb59c | 4872 | health_code_update(); |
d0b96690 | 4873 | destroy_app_session(app, ua_sess); |
84cd17c6 | 4874 | |
840cb59c | 4875 | health_code_update(); |
7db205b5 | 4876 | |
84cd17c6 | 4877 | /* Quiescent wait after stopping trace */ |
fb45065e | 4878 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4879 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4880 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4881 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4882 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4883 | app->pid, ret); | |
4884 | } | |
e0c7ec2b DG |
4885 | end: |
4886 | rcu_read_unlock(); | |
840cb59c | 4887 | health_code_update(); |
84cd17c6 | 4888 | return 0; |
84cd17c6 MD |
4889 | } |
4890 | ||
5b4a0ec0 DG |
4891 | /* |
4892 | * Start tracing for the UST session. | |
4893 | */ | |
421cb601 DG |
4894 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
4895 | { | |
bec39940 | 4896 | struct lttng_ht_iter iter; |
421cb601 | 4897 | struct ust_app *app; |
48842b30 | 4898 | |
421cb601 DG |
4899 | DBG("Starting all UST traces"); |
4900 | ||
bb2452c8 MD |
4901 | /* |
4902 | * Even though the start trace might fail, flag this session active so | |
4903 | * other application coming in are started by default. | |
4904 | */ | |
4905 | usess->active = 1; | |
4906 | ||
421cb601 | 4907 | rcu_read_lock(); |
421cb601 | 4908 | |
0dd01979 MD |
4909 | /* |
4910 | * In a start-stop-start use-case, we need to clear the quiescent state | |
4911 | * of each channel set by the prior stop command, thus ensuring that a | |
4912 | * following stop or destroy is sure to grab a timestamp_end near those | |
4913 | * operations, even if the packet is empty. | |
4914 | */ | |
4915 | (void) ust_app_clear_quiescent_session(usess); | |
4916 | ||
0498a00c MD |
4917 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4918 | ust_app_global_update(usess, app); | |
4919 | } | |
4920 | ||
48842b30 DG |
4921 | rcu_read_unlock(); |
4922 | ||
4923 | return 0; | |
4924 | } | |
487cf67c | 4925 | |
8be98f9a MD |
4926 | /* |
4927 | * Start tracing for the UST session. | |
ce34fcd0 | 4928 | * Called with UST session lock held. |
8be98f9a MD |
4929 | */ |
4930 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
4931 | { | |
4932 | int ret = 0; | |
bec39940 | 4933 | struct lttng_ht_iter iter; |
8be98f9a MD |
4934 | struct ust_app *app; |
4935 | ||
4936 | DBG("Stopping all UST traces"); | |
4937 | ||
bb2452c8 MD |
4938 | /* |
4939 | * Even though the stop trace might fail, flag this session inactive so | |
4940 | * other application coming in are not started by default. | |
4941 | */ | |
4942 | usess->active = 0; | |
4943 | ||
8be98f9a MD |
4944 | rcu_read_lock(); |
4945 | ||
b34cbebf MD |
4946 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4947 | ret = ust_app_stop_trace(usess, app); | |
4948 | if (ret < 0) { | |
4949 | /* Continue to next apps even on error */ | |
4950 | continue; | |
4951 | } | |
4952 | } | |
4953 | ||
ce34fcd0 | 4954 | (void) ust_app_flush_session(usess); |
8be98f9a MD |
4955 | |
4956 | rcu_read_unlock(); | |
4957 | ||
4958 | return 0; | |
4959 | } | |
4960 | ||
84cd17c6 MD |
4961 | /* |
4962 | * Destroy app UST session. | |
4963 | */ | |
4964 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
4965 | { | |
4966 | int ret = 0; | |
bec39940 | 4967 | struct lttng_ht_iter iter; |
84cd17c6 MD |
4968 | struct ust_app *app; |
4969 | ||
4970 | DBG("Destroy all UST traces"); | |
4971 | ||
4972 | rcu_read_lock(); | |
4973 | ||
852d0037 | 4974 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 4975 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
4976 | if (ret < 0) { |
4977 | /* Continue to next apps even on error */ | |
4978 | continue; | |
4979 | } | |
4980 | } | |
4981 | ||
4982 | rcu_read_unlock(); | |
4983 | ||
4984 | return 0; | |
4985 | } | |
4986 | ||
88e3c2f5 | 4987 | /* The ua_sess lock must be held by the caller. */ |
a9ad0c8f | 4988 | static |
88e3c2f5 JG |
4989 | int find_or_create_ust_app_channel( |
4990 | struct ltt_ust_session *usess, | |
4991 | struct ust_app_session *ua_sess, | |
4992 | struct ust_app *app, | |
4993 | struct ltt_ust_channel *uchan, | |
4994 | struct ust_app_channel **ua_chan) | |
487cf67c | 4995 | { |
55c54cce | 4996 | int ret = 0; |
88e3c2f5 JG |
4997 | struct lttng_ht_iter iter; |
4998 | struct lttng_ht_node_str *ua_chan_node; | |
4999 | ||
5000 | lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &iter); | |
5001 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
5002 | if (ua_chan_node) { | |
5003 | *ua_chan = caa_container_of(ua_chan_node, | |
5004 | struct ust_app_channel, node); | |
5005 | goto end; | |
5006 | } | |
5007 | ||
5008 | ret = ust_app_channel_create(usess, ua_sess, uchan, app, ua_chan); | |
5009 | if (ret) { | |
5010 | goto end; | |
5011 | } | |
5012 | end: | |
5013 | return ret; | |
5014 | } | |
5015 | ||
5016 | static | |
5017 | int ust_app_channel_synchronize_event(struct ust_app_channel *ua_chan, | |
5018 | struct ltt_ust_event *uevent, struct ust_app_session *ua_sess, | |
5019 | struct ust_app *app) | |
5020 | { | |
5021 | int ret = 0; | |
5022 | struct ust_app_event *ua_event = NULL; | |
5023 | ||
5024 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
5025 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); | |
5026 | if (!ua_event) { | |
5027 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); | |
5028 | if (ret < 0) { | |
5029 | goto end; | |
5030 | } | |
5031 | } else { | |
5032 | if (ua_event->enabled != uevent->enabled) { | |
5033 | ret = uevent->enabled ? | |
5034 | enable_ust_app_event(ua_sess, ua_event, app) : | |
5035 | disable_ust_app_event(ua_sess, ua_event, app); | |
5036 | } | |
5037 | } | |
5038 | ||
5039 | end: | |
5040 | return ret; | |
5041 | } | |
5042 | ||
5043 | /* | |
5044 | * The caller must ensure that the application is compatible and is tracked | |
5045 | * by the PID tracker. | |
5046 | */ | |
5047 | static | |
5048 | void ust_app_synchronize(struct ltt_ust_session *usess, | |
5049 | struct ust_app *app) | |
5050 | { | |
5051 | int ret = 0; | |
5052 | struct cds_lfht_iter uchan_iter; | |
5053 | struct ltt_ust_channel *uchan; | |
3d8ca23b | 5054 | struct ust_app_session *ua_sess = NULL; |
1f3580c7 | 5055 | |
88e3c2f5 JG |
5056 | /* |
5057 | * The application's configuration should only be synchronized for | |
5058 | * active sessions. | |
5059 | */ | |
5060 | assert(usess->active); | |
5061 | ||
5062 | ret = find_or_create_ust_app_session(usess, app, &ua_sess, NULL); | |
3d8ca23b DG |
5063 | if (ret < 0) { |
5064 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
5065 | goto error; |
5066 | } | |
3d8ca23b | 5067 | assert(ua_sess); |
487cf67c | 5068 | |
d0b96690 | 5069 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
5070 | if (ua_sess->deleted) { |
5071 | pthread_mutex_unlock(&ua_sess->lock); | |
5072 | goto end; | |
5073 | } | |
5074 | ||
88e3c2f5 JG |
5075 | rcu_read_lock(); |
5076 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &uchan_iter, | |
5077 | uchan, node.node) { | |
5078 | struct ust_app_channel *ua_chan; | |
5079 | struct cds_lfht_iter uevent_iter; | |
5080 | struct ltt_ust_event *uevent; | |
487cf67c | 5081 | |
31746f93 | 5082 | /* |
88e3c2f5 JG |
5083 | * Search for a matching ust_app_channel. If none is found, |
5084 | * create it. Creating the channel will cause the ua_chan | |
5085 | * structure to be allocated, the channel buffers to be | |
5086 | * allocated (if necessary) and sent to the application, and | |
5087 | * all enabled contexts will be added to the channel. | |
31746f93 | 5088 | */ |
88e3c2f5 JG |
5089 | ret = find_or_create_ust_app_channel(usess, ua_sess, |
5090 | app, uchan, &ua_chan); | |
5091 | if (ret) { | |
5092 | /* Tracer is probably gone or ENOMEM. */ | |
5093 | goto error_unlock; | |
727d5404 DG |
5094 | } |
5095 | ||
88e3c2f5 JG |
5096 | if (!ua_chan) { |
5097 | /* ua_chan will be NULL for the metadata channel */ | |
5098 | continue; | |
5099 | } | |
727d5404 | 5100 | |
88e3c2f5 | 5101 | cds_lfht_for_each_entry(uchan->events->ht, &uevent_iter, uevent, |
bec39940 | 5102 | node.node) { |
88e3c2f5 JG |
5103 | ret = ust_app_channel_synchronize_event(ua_chan, |
5104 | uevent, ua_sess, app); | |
5105 | if (ret) { | |
d0b96690 | 5106 | goto error_unlock; |
487cf67c | 5107 | } |
36dc12cc | 5108 | } |
d0b96690 | 5109 | |
88e3c2f5 JG |
5110 | if (ua_chan->enabled != uchan->enabled) { |
5111 | ret = uchan->enabled ? | |
5112 | enable_ust_app_channel(ua_sess, uchan, app) : | |
5113 | disable_ust_app_channel(ua_sess, ua_chan, app); | |
5114 | if (ret) { | |
5115 | goto error_unlock; | |
5116 | } | |
5117 | } | |
36dc12cc | 5118 | } |
88e3c2f5 | 5119 | rcu_read_unlock(); |
0498a00c | 5120 | |
a9ad0c8f | 5121 | end: |
88e3c2f5 | 5122 | pthread_mutex_unlock(&ua_sess->lock); |
ffe60014 | 5123 | /* Everything went well at this point. */ |
ffe60014 DG |
5124 | return; |
5125 | ||
d0b96690 | 5126 | error_unlock: |
88e3c2f5 | 5127 | rcu_read_unlock(); |
d0b96690 | 5128 | pthread_mutex_unlock(&ua_sess->lock); |
487cf67c | 5129 | error: |
ffe60014 | 5130 | if (ua_sess) { |
d0b96690 | 5131 | destroy_app_session(app, ua_sess); |
ffe60014 | 5132 | } |
487cf67c DG |
5133 | return; |
5134 | } | |
55cc08a6 | 5135 | |
a9ad0c8f MD |
5136 | static |
5137 | void ust_app_global_destroy(struct ltt_ust_session *usess, struct ust_app *app) | |
5138 | { | |
5139 | struct ust_app_session *ua_sess; | |
5140 | ||
5141 | ua_sess = lookup_session_by_app(usess, app); | |
5142 | if (ua_sess == NULL) { | |
5143 | return; | |
5144 | } | |
5145 | destroy_app_session(app, ua_sess); | |
5146 | } | |
5147 | ||
5148 | /* | |
5149 | * Add channels/events from UST global domain to registered apps at sock. | |
5150 | * | |
5151 | * Called with session lock held. | |
5152 | * Called with RCU read-side lock held. | |
5153 | */ | |
5154 | void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app) | |
5155 | { | |
5156 | assert(usess); | |
88e3c2f5 | 5157 | assert(usess->active); |
a9ad0c8f MD |
5158 | |
5159 | DBG2("UST app global update for app sock %d for session id %" PRIu64, | |
5160 | app->sock, usess->id); | |
5161 | ||
5162 | if (!app->compatible) { | |
5163 | return; | |
5164 | } | |
a9ad0c8f | 5165 | if (trace_ust_pid_tracker_lookup(usess, app->pid)) { |
88e3c2f5 JG |
5166 | /* |
5167 | * Synchronize the application's internal tracing configuration | |
5168 | * and start tracing. | |
5169 | */ | |
5170 | ust_app_synchronize(usess, app); | |
5171 | ust_app_start_trace(usess, app); | |
a9ad0c8f MD |
5172 | } else { |
5173 | ust_app_global_destroy(usess, app); | |
5174 | } | |
5175 | } | |
5176 | ||
5177 | /* | |
5178 | * Called with session lock held. | |
5179 | */ | |
5180 | void ust_app_global_update_all(struct ltt_ust_session *usess) | |
5181 | { | |
5182 | struct lttng_ht_iter iter; | |
5183 | struct ust_app *app; | |
5184 | ||
5185 | rcu_read_lock(); | |
5186 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5187 | ust_app_global_update(usess, app); | |
5188 | } | |
5189 | rcu_read_unlock(); | |
5190 | } | |
5191 | ||
55cc08a6 DG |
5192 | /* |
5193 | * Add context to a specific channel for global UST domain. | |
5194 | */ | |
5195 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
5196 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
5197 | { | |
5198 | int ret = 0; | |
bec39940 DG |
5199 | struct lttng_ht_node_str *ua_chan_node; |
5200 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
5201 | struct ust_app_channel *ua_chan = NULL; |
5202 | struct ust_app_session *ua_sess; | |
5203 | struct ust_app *app; | |
5204 | ||
88e3c2f5 | 5205 | assert(usess->active); |
0498a00c | 5206 | |
55cc08a6 | 5207 | rcu_read_lock(); |
852d0037 | 5208 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
5209 | if (!app->compatible) { |
5210 | /* | |
5211 | * TODO: In time, we should notice the caller of this error by | |
5212 | * telling him that this is a version error. | |
5213 | */ | |
5214 | continue; | |
5215 | } | |
55cc08a6 DG |
5216 | ua_sess = lookup_session_by_app(usess, app); |
5217 | if (ua_sess == NULL) { | |
5218 | continue; | |
5219 | } | |
5220 | ||
d0b96690 | 5221 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
5222 | |
5223 | if (ua_sess->deleted) { | |
5224 | pthread_mutex_unlock(&ua_sess->lock); | |
5225 | continue; | |
5226 | } | |
5227 | ||
55cc08a6 | 5228 | /* Lookup channel in the ust app session */ |
bec39940 DG |
5229 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
5230 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 5231 | if (ua_chan_node == NULL) { |
d0b96690 | 5232 | goto next_app; |
55cc08a6 DG |
5233 | } |
5234 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
5235 | node); | |
c9edf082 | 5236 | ret = create_ust_app_channel_context(ua_chan, &uctx->ctx, app); |
55cc08a6 | 5237 | if (ret < 0) { |
d0b96690 | 5238 | goto next_app; |
55cc08a6 | 5239 | } |
d0b96690 DG |
5240 | next_app: |
5241 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
5242 | } |
5243 | ||
55cc08a6 | 5244 | rcu_read_unlock(); |
76d45b40 DG |
5245 | return ret; |
5246 | } | |
7f79d3a1 | 5247 | |
d0b96690 DG |
5248 | /* |
5249 | * Receive registration and populate the given msg structure. | |
5250 | * | |
5251 | * On success return 0 else a negative value returned by the ustctl call. | |
5252 | */ | |
5253 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
5254 | { | |
5255 | int ret; | |
5256 | uint32_t pid, ppid, uid, gid; | |
5257 | ||
5258 | assert(msg); | |
5259 | ||
5260 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
5261 | &pid, &ppid, &uid, &gid, | |
5262 | &msg->bits_per_long, | |
5263 | &msg->uint8_t_alignment, | |
5264 | &msg->uint16_t_alignment, | |
5265 | &msg->uint32_t_alignment, | |
5266 | &msg->uint64_t_alignment, | |
5267 | &msg->long_alignment, | |
5268 | &msg->byte_order, | |
5269 | msg->name); | |
5270 | if (ret < 0) { | |
5271 | switch (-ret) { | |
5272 | case EPIPE: | |
5273 | case ECONNRESET: | |
5274 | case LTTNG_UST_ERR_EXITING: | |
5275 | DBG3("UST app recv reg message failed. Application died"); | |
5276 | break; | |
5277 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
5278 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
5279 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
5280 | LTTNG_UST_ABI_MINOR_VERSION); | |
5281 | break; | |
5282 | default: | |
5283 | ERR("UST app recv reg message failed with ret %d", ret); | |
5284 | break; | |
5285 | } | |
5286 | goto error; | |
5287 | } | |
5288 | msg->pid = (pid_t) pid; | |
5289 | msg->ppid = (pid_t) ppid; | |
5290 | msg->uid = (uid_t) uid; | |
5291 | msg->gid = (gid_t) gid; | |
5292 | ||
5293 | error: | |
5294 | return ret; | |
5295 | } | |
5296 | ||
10b56aef MD |
5297 | /* |
5298 | * Return a ust app session object using the application object and the | |
5299 | * session object descriptor has a key. If not found, NULL is returned. | |
5300 | * A RCU read side lock MUST be acquired when calling this function. | |
5301 | */ | |
5302 | static struct ust_app_session *find_session_by_objd(struct ust_app *app, | |
5303 | int objd) | |
5304 | { | |
5305 | struct lttng_ht_node_ulong *node; | |
5306 | struct lttng_ht_iter iter; | |
5307 | struct ust_app_session *ua_sess = NULL; | |
5308 | ||
5309 | assert(app); | |
5310 | ||
5311 | lttng_ht_lookup(app->ust_sessions_objd, (void *)((unsigned long) objd), &iter); | |
5312 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5313 | if (node == NULL) { | |
5314 | DBG2("UST app session find by objd %d not found", objd); | |
5315 | goto error; | |
5316 | } | |
5317 | ||
5318 | ua_sess = caa_container_of(node, struct ust_app_session, ust_objd_node); | |
5319 | ||
5320 | error: | |
5321 | return ua_sess; | |
5322 | } | |
5323 | ||
d88aee68 DG |
5324 | /* |
5325 | * Return a ust app channel object using the application object and the channel | |
5326 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
5327 | * lock MUST be acquired before calling this function. | |
5328 | */ | |
d0b96690 DG |
5329 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
5330 | int objd) | |
5331 | { | |
5332 | struct lttng_ht_node_ulong *node; | |
5333 | struct lttng_ht_iter iter; | |
5334 | struct ust_app_channel *ua_chan = NULL; | |
5335 | ||
5336 | assert(app); | |
5337 | ||
5338 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
5339 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5340 | if (node == NULL) { | |
5341 | DBG2("UST app channel find by objd %d not found", objd); | |
5342 | goto error; | |
5343 | } | |
5344 | ||
5345 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
5346 | ||
5347 | error: | |
5348 | return ua_chan; | |
5349 | } | |
5350 | ||
d88aee68 DG |
5351 | /* |
5352 | * Reply to a register channel notification from an application on the notify | |
5353 | * socket. The channel metadata is also created. | |
5354 | * | |
5355 | * The session UST registry lock is acquired in this function. | |
5356 | * | |
5357 | * On success 0 is returned else a negative value. | |
5358 | */ | |
8eede835 | 5359 | static int reply_ust_register_channel(int sock, int cobjd, |
d0b96690 DG |
5360 | size_t nr_fields, struct ustctl_field *fields) |
5361 | { | |
5362 | int ret, ret_code = 0; | |
294e218e | 5363 | uint32_t chan_id; |
7972aab2 | 5364 | uint64_t chan_reg_key; |
d0b96690 DG |
5365 | enum ustctl_channel_header type; |
5366 | struct ust_app *app; | |
5367 | struct ust_app_channel *ua_chan; | |
5368 | struct ust_app_session *ua_sess; | |
7972aab2 | 5369 | struct ust_registry_session *registry; |
45893984 | 5370 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
5371 | |
5372 | rcu_read_lock(); | |
5373 | ||
5374 | /* Lookup application. If not found, there is a code flow error. */ | |
5375 | app = find_app_by_notify_sock(sock); | |
d88aee68 | 5376 | if (!app) { |
fad1ed2f | 5377 | DBG("Application socket %d is being torn down. Abort event notify", |
d88aee68 DG |
5378 | sock); |
5379 | ret = 0; | |
5380 | goto error_rcu_unlock; | |
5381 | } | |
d0b96690 | 5382 | |
4950b860 | 5383 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 5384 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 | 5385 | if (!ua_chan) { |
fad1ed2f | 5386 | DBG("Application channel is being torn down. Abort event notify"); |
4950b860 MD |
5387 | ret = 0; |
5388 | goto error_rcu_unlock; | |
5389 | } | |
5390 | ||
d0b96690 DG |
5391 | assert(ua_chan->session); |
5392 | ua_sess = ua_chan->session; | |
d0b96690 | 5393 | |
7972aab2 DG |
5394 | /* Get right session registry depending on the session buffer type. */ |
5395 | registry = get_session_registry(ua_sess); | |
fad1ed2f JR |
5396 | if (!registry) { |
5397 | DBG("Application session is being torn down. Abort event notify"); | |
5398 | ret = 0; | |
5399 | goto error_rcu_unlock; | |
5400 | }; | |
45893984 | 5401 | |
7972aab2 DG |
5402 | /* Depending on the buffer type, a different channel key is used. */ |
5403 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
5404 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 5405 | } else { |
7972aab2 | 5406 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
5407 | } |
5408 | ||
7972aab2 DG |
5409 | pthread_mutex_lock(®istry->lock); |
5410 | ||
5411 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
5412 | assert(chan_reg); | |
5413 | ||
5414 | if (!chan_reg->register_done) { | |
294e218e MD |
5415 | /* |
5416 | * TODO: eventually use the registry event count for | |
5417 | * this channel to better guess header type for per-pid | |
5418 | * buffers. | |
5419 | */ | |
5420 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
7972aab2 DG |
5421 | chan_reg->nr_ctx_fields = nr_fields; |
5422 | chan_reg->ctx_fields = fields; | |
fad1ed2f | 5423 | fields = NULL; |
7972aab2 | 5424 | chan_reg->header_type = type; |
d0b96690 | 5425 | } else { |
7972aab2 DG |
5426 | /* Get current already assigned values. */ |
5427 | type = chan_reg->header_type; | |
d0b96690 | 5428 | } |
7972aab2 DG |
5429 | /* Channel id is set during the object creation. */ |
5430 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
5431 | |
5432 | /* Append to metadata */ | |
7972aab2 DG |
5433 | if (!chan_reg->metadata_dumped) { |
5434 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
5435 | if (ret_code) { |
5436 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
5437 | goto reply; | |
5438 | } | |
5439 | } | |
5440 | ||
5441 | reply: | |
7972aab2 DG |
5442 | DBG3("UST app replying to register channel key %" PRIu64 |
5443 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
5444 | ret_code); | |
d0b96690 DG |
5445 | |
5446 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
5447 | if (ret < 0) { | |
5448 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5449 | ERR("UST app reply channel failed with ret %d", ret); | |
5450 | } else { | |
5451 | DBG3("UST app reply channel failed. Application died"); | |
5452 | } | |
5453 | goto error; | |
5454 | } | |
5455 | ||
7972aab2 DG |
5456 | /* This channel registry registration is completed. */ |
5457 | chan_reg->register_done = 1; | |
5458 | ||
d0b96690 | 5459 | error: |
7972aab2 | 5460 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 5461 | error_rcu_unlock: |
d0b96690 | 5462 | rcu_read_unlock(); |
fad1ed2f | 5463 | free(fields); |
d0b96690 DG |
5464 | return ret; |
5465 | } | |
5466 | ||
d88aee68 DG |
5467 | /* |
5468 | * Add event to the UST channel registry. When the event is added to the | |
5469 | * registry, the metadata is also created. Once done, this replies to the | |
5470 | * application with the appropriate error code. | |
5471 | * | |
5472 | * The session UST registry lock is acquired in the function. | |
5473 | * | |
5474 | * On success 0 is returned else a negative value. | |
5475 | */ | |
d0b96690 | 5476 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
2106efa0 PP |
5477 | char *sig, size_t nr_fields, struct ustctl_field *fields, |
5478 | int loglevel_value, char *model_emf_uri) | |
d0b96690 DG |
5479 | { |
5480 | int ret, ret_code; | |
5481 | uint32_t event_id = 0; | |
7972aab2 | 5482 | uint64_t chan_reg_key; |
d0b96690 DG |
5483 | struct ust_app *app; |
5484 | struct ust_app_channel *ua_chan; | |
5485 | struct ust_app_session *ua_sess; | |
7972aab2 | 5486 | struct ust_registry_session *registry; |
d0b96690 DG |
5487 | |
5488 | rcu_read_lock(); | |
5489 | ||
5490 | /* Lookup application. If not found, there is a code flow error. */ | |
5491 | app = find_app_by_notify_sock(sock); | |
d88aee68 | 5492 | if (!app) { |
fad1ed2f | 5493 | DBG("Application socket %d is being torn down. Abort event notify", |
d88aee68 DG |
5494 | sock); |
5495 | ret = 0; | |
5496 | goto error_rcu_unlock; | |
5497 | } | |
d0b96690 | 5498 | |
4950b860 | 5499 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 5500 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 | 5501 | if (!ua_chan) { |
fad1ed2f | 5502 | DBG("Application channel is being torn down. Abort event notify"); |
4950b860 MD |
5503 | ret = 0; |
5504 | goto error_rcu_unlock; | |
5505 | } | |
5506 | ||
d0b96690 DG |
5507 | assert(ua_chan->session); |
5508 | ua_sess = ua_chan->session; | |
5509 | ||
7972aab2 | 5510 | registry = get_session_registry(ua_sess); |
fad1ed2f JR |
5511 | if (!registry) { |
5512 | DBG("Application session is being torn down. Abort event notify"); | |
5513 | ret = 0; | |
5514 | goto error_rcu_unlock; | |
5515 | } | |
7972aab2 DG |
5516 | |
5517 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
5518 | chan_reg_key = ua_chan->tracing_channel_id; | |
5519 | } else { | |
5520 | chan_reg_key = ua_chan->key; | |
5521 | } | |
5522 | ||
5523 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 5524 | |
d5d629b5 DG |
5525 | /* |
5526 | * From this point on, this call acquires the ownership of the sig, fields | |
5527 | * and model_emf_uri meaning any free are done inside it if needed. These | |
5528 | * three variables MUST NOT be read/write after this. | |
5529 | */ | |
7972aab2 | 5530 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
2106efa0 PP |
5531 | sobjd, cobjd, name, sig, nr_fields, fields, |
5532 | loglevel_value, model_emf_uri, ua_sess->buffer_type, | |
5533 | &event_id, app); | |
fad1ed2f JR |
5534 | sig = NULL; |
5535 | fields = NULL; | |
5536 | model_emf_uri = NULL; | |
d0b96690 DG |
5537 | |
5538 | /* | |
5539 | * The return value is returned to ustctl so in case of an error, the | |
5540 | * application can be notified. In case of an error, it's important not to | |
5541 | * return a negative error or else the application will get closed. | |
5542 | */ | |
5543 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
5544 | if (ret < 0) { | |
5545 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5546 | ERR("UST app reply event failed with ret %d", ret); | |
5547 | } else { | |
5548 | DBG3("UST app reply event failed. Application died"); | |
5549 | } | |
5550 | /* | |
5551 | * No need to wipe the create event since the application socket will | |
5552 | * get close on error hence cleaning up everything by itself. | |
5553 | */ | |
5554 | goto error; | |
5555 | } | |
5556 | ||
7972aab2 DG |
5557 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
5558 | name, event_id); | |
d88aee68 | 5559 | |
d0b96690 | 5560 | error: |
7972aab2 | 5561 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 5562 | error_rcu_unlock: |
d0b96690 | 5563 | rcu_read_unlock(); |
fad1ed2f JR |
5564 | free(sig); |
5565 | free(fields); | |
5566 | free(model_emf_uri); | |
d0b96690 DG |
5567 | return ret; |
5568 | } | |
5569 | ||
10b56aef MD |
5570 | /* |
5571 | * Add enum to the UST session registry. Once done, this replies to the | |
5572 | * application with the appropriate error code. | |
5573 | * | |
5574 | * The session UST registry lock is acquired within this function. | |
5575 | * | |
5576 | * On success 0 is returned else a negative value. | |
5577 | */ | |
5578 | static int add_enum_ust_registry(int sock, int sobjd, char *name, | |
5579 | struct ustctl_enum_entry *entries, size_t nr_entries) | |
5580 | { | |
5581 | int ret = 0, ret_code; | |
5582 | struct ust_app *app; | |
5583 | struct ust_app_session *ua_sess; | |
5584 | struct ust_registry_session *registry; | |
5585 | uint64_t enum_id = -1ULL; | |
5586 | ||
5587 | rcu_read_lock(); | |
5588 | ||
5589 | /* Lookup application. If not found, there is a code flow error. */ | |
5590 | app = find_app_by_notify_sock(sock); | |
5591 | if (!app) { | |
5592 | /* Return an error since this is not an error */ | |
5593 | DBG("Application socket %d is being torn down. Aborting enum registration", | |
5594 | sock); | |
5595 | free(entries); | |
5596 | goto error_rcu_unlock; | |
5597 | } | |
5598 | ||
5599 | /* Lookup session by UST object descriptor. */ | |
5600 | ua_sess = find_session_by_objd(app, sobjd); | |
5601 | if (!ua_sess) { | |
5602 | /* Return an error since this is not an error */ | |
fad1ed2f | 5603 | DBG("Application session is being torn down (session not found). Aborting enum registration."); |
10b56aef MD |
5604 | free(entries); |
5605 | goto error_rcu_unlock; | |
5606 | } | |
5607 | ||
5608 | registry = get_session_registry(ua_sess); | |
fad1ed2f JR |
5609 | if (!registry) { |
5610 | DBG("Application session is being torn down (registry not found). Aborting enum registration."); | |
5611 | free(entries); | |
5612 | goto error_rcu_unlock; | |
5613 | } | |
10b56aef MD |
5614 | |
5615 | pthread_mutex_lock(®istry->lock); | |
5616 | ||
5617 | /* | |
5618 | * From this point on, the callee acquires the ownership of | |
5619 | * entries. The variable entries MUST NOT be read/written after | |
5620 | * call. | |
5621 | */ | |
5622 | ret_code = ust_registry_create_or_find_enum(registry, sobjd, name, | |
5623 | entries, nr_entries, &enum_id); | |
5624 | entries = NULL; | |
5625 | ||
5626 | /* | |
5627 | * The return value is returned to ustctl so in case of an error, the | |
5628 | * application can be notified. In case of an error, it's important not to | |
5629 | * return a negative error or else the application will get closed. | |
5630 | */ | |
5631 | ret = ustctl_reply_register_enum(sock, enum_id, ret_code); | |
5632 | if (ret < 0) { | |
5633 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5634 | ERR("UST app reply enum failed with ret %d", ret); | |
5635 | } else { | |
5636 | DBG3("UST app reply enum failed. Application died"); | |
5637 | } | |
5638 | /* | |
5639 | * No need to wipe the create enum since the application socket will | |
5640 | * get close on error hence cleaning up everything by itself. | |
5641 | */ | |
5642 | goto error; | |
5643 | } | |
5644 | ||
5645 | DBG3("UST registry enum %s added successfully or already found", name); | |
5646 | ||
5647 | error: | |
5648 | pthread_mutex_unlock(®istry->lock); | |
5649 | error_rcu_unlock: | |
5650 | rcu_read_unlock(); | |
5651 | return ret; | |
5652 | } | |
5653 | ||
d88aee68 DG |
5654 | /* |
5655 | * Handle application notification through the given notify socket. | |
5656 | * | |
5657 | * Return 0 on success or else a negative value. | |
5658 | */ | |
d0b96690 DG |
5659 | int ust_app_recv_notify(int sock) |
5660 | { | |
5661 | int ret; | |
5662 | enum ustctl_notify_cmd cmd; | |
5663 | ||
5664 | DBG3("UST app receiving notify from sock %d", sock); | |
5665 | ||
5666 | ret = ustctl_recv_notify(sock, &cmd); | |
5667 | if (ret < 0) { | |
5668 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5669 | ERR("UST app recv notify failed with ret %d", ret); | |
5670 | } else { | |
5671 | DBG3("UST app recv notify failed. Application died"); | |
5672 | } | |
5673 | goto error; | |
5674 | } | |
5675 | ||
5676 | switch (cmd) { | |
5677 | case USTCTL_NOTIFY_CMD_EVENT: | |
5678 | { | |
2106efa0 | 5679 | int sobjd, cobjd, loglevel_value; |
d0b96690 DG |
5680 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; |
5681 | size_t nr_fields; | |
5682 | struct ustctl_field *fields; | |
5683 | ||
5684 | DBG2("UST app ustctl register event received"); | |
5685 | ||
2106efa0 PP |
5686 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, |
5687 | &loglevel_value, &sig, &nr_fields, &fields, | |
5688 | &model_emf_uri); | |
d0b96690 DG |
5689 | if (ret < 0) { |
5690 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5691 | ERR("UST app recv event failed with ret %d", ret); | |
5692 | } else { | |
5693 | DBG3("UST app recv event failed. Application died"); | |
5694 | } | |
5695 | goto error; | |
5696 | } | |
5697 | ||
d5d629b5 DG |
5698 | /* |
5699 | * Add event to the UST registry coming from the notify socket. This | |
5700 | * call will free if needed the sig, fields and model_emf_uri. This | |
5701 | * code path loses the ownsership of these variables and transfer them | |
5702 | * to the this function. | |
5703 | */ | |
d0b96690 | 5704 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
2106efa0 | 5705 | fields, loglevel_value, model_emf_uri); |
d0b96690 DG |
5706 | if (ret < 0) { |
5707 | goto error; | |
5708 | } | |
5709 | ||
5710 | break; | |
5711 | } | |
5712 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
5713 | { | |
5714 | int sobjd, cobjd; | |
5715 | size_t nr_fields; | |
5716 | struct ustctl_field *fields; | |
5717 | ||
5718 | DBG2("UST app ustctl register channel received"); | |
5719 | ||
5720 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
5721 | &fields); | |
5722 | if (ret < 0) { | |
5723 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5724 | ERR("UST app recv channel failed with ret %d", ret); | |
5725 | } else { | |
5726 | DBG3("UST app recv channel failed. Application died"); | |
5727 | } | |
5728 | goto error; | |
5729 | } | |
5730 | ||
d5d629b5 DG |
5731 | /* |
5732 | * The fields ownership are transfered to this function call meaning | |
5733 | * that if needed it will be freed. After this, it's invalid to access | |
5734 | * fields or clean it up. | |
5735 | */ | |
8eede835 | 5736 | ret = reply_ust_register_channel(sock, cobjd, nr_fields, |
d0b96690 DG |
5737 | fields); |
5738 | if (ret < 0) { | |
5739 | goto error; | |
5740 | } | |
5741 | ||
5742 | break; | |
5743 | } | |
10b56aef MD |
5744 | case USTCTL_NOTIFY_CMD_ENUM: |
5745 | { | |
5746 | int sobjd; | |
5747 | char name[LTTNG_UST_SYM_NAME_LEN]; | |
5748 | size_t nr_entries; | |
5749 | struct ustctl_enum_entry *entries; | |
5750 | ||
5751 | DBG2("UST app ustctl register enum received"); | |
5752 | ||
5753 | ret = ustctl_recv_register_enum(sock, &sobjd, name, | |
5754 | &entries, &nr_entries); | |
5755 | if (ret < 0) { | |
5756 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5757 | ERR("UST app recv enum failed with ret %d", ret); | |
5758 | } else { | |
5759 | DBG3("UST app recv enum failed. Application died"); | |
5760 | } | |
5761 | goto error; | |
5762 | } | |
5763 | ||
5764 | /* Callee assumes ownership of entries */ | |
5765 | ret = add_enum_ust_registry(sock, sobjd, name, | |
5766 | entries, nr_entries); | |
5767 | if (ret < 0) { | |
5768 | goto error; | |
5769 | } | |
5770 | ||
5771 | break; | |
5772 | } | |
d0b96690 DG |
5773 | default: |
5774 | /* Should NEVER happen. */ | |
5775 | assert(0); | |
5776 | } | |
5777 | ||
5778 | error: | |
5779 | return ret; | |
5780 | } | |
d88aee68 DG |
5781 | |
5782 | /* | |
5783 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
5784 | * corresponding application. On failure, the call_rcu to close the socket is | |
5785 | * executed. If an application is found, it tries to delete it from the notify | |
5786 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
5787 | * | |
5788 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
5789 | * call RCU is not done but the rest of the cleanup is. | |
5790 | */ | |
5791 | void ust_app_notify_sock_unregister(int sock) | |
5792 | { | |
5793 | int err_enomem = 0; | |
5794 | struct lttng_ht_iter iter; | |
5795 | struct ust_app *app; | |
5796 | struct ust_app_notify_sock_obj *obj; | |
5797 | ||
5798 | assert(sock >= 0); | |
5799 | ||
5800 | rcu_read_lock(); | |
5801 | ||
5802 | obj = zmalloc(sizeof(*obj)); | |
5803 | if (!obj) { | |
5804 | /* | |
5805 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
5806 | * procedure but the call_rcu will not be called. In this case, we | |
5807 | * accept the fd leak rather than possibly creating an unsynchronized | |
5808 | * state between threads. | |
5809 | * | |
5810 | * TODO: The notify object should be created once the notify socket is | |
5811 | * registered and stored independantely from the ust app object. The | |
5812 | * tricky part is to synchronize the teardown of the application and | |
5813 | * this notify object. Let's keep that in mind so we can avoid this | |
5814 | * kind of shenanigans with ENOMEM in the teardown path. | |
5815 | */ | |
5816 | err_enomem = 1; | |
5817 | } else { | |
5818 | obj->fd = sock; | |
5819 | } | |
5820 | ||
5821 | DBG("UST app notify socket unregister %d", sock); | |
5822 | ||
5823 | /* | |
5824 | * Lookup application by notify socket. If this fails, this means that the | |
5825 | * hash table delete has already been done by the application | |
5826 | * unregistration process so we can safely close the notify socket in a | |
5827 | * call RCU. | |
5828 | */ | |
5829 | app = find_app_by_notify_sock(sock); | |
5830 | if (!app) { | |
5831 | goto close_socket; | |
5832 | } | |
5833 | ||
5834 | iter.iter.node = &app->notify_sock_n.node; | |
5835 | ||
5836 | /* | |
5837 | * Whatever happens here either we fail or succeed, in both cases we have | |
5838 | * to close the socket after a grace period to continue to the call RCU | |
5839 | * here. If the deletion is successful, the application is not visible | |
5840 | * anymore by other threads and is it fails it means that it was already | |
5841 | * deleted from the hash table so either way we just have to close the | |
5842 | * socket. | |
5843 | */ | |
5844 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
5845 | ||
5846 | close_socket: | |
5847 | rcu_read_unlock(); | |
5848 | ||
5849 | /* | |
5850 | * Close socket after a grace period to avoid for the socket to be reused | |
5851 | * before the application object is freed creating potential race between | |
5852 | * threads trying to add unique in the global hash table. | |
5853 | */ | |
5854 | if (!err_enomem) { | |
5855 | call_rcu(&obj->head, close_notify_sock_rcu); | |
5856 | } | |
5857 | } | |
f45e313d DG |
5858 | |
5859 | /* | |
5860 | * Destroy a ust app data structure and free its memory. | |
5861 | */ | |
5862 | void ust_app_destroy(struct ust_app *app) | |
5863 | { | |
5864 | if (!app) { | |
5865 | return; | |
5866 | } | |
5867 | ||
5868 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
5869 | } | |
6dc3064a DG |
5870 | |
5871 | /* | |
5872 | * Take a snapshot for a given UST session. The snapshot is sent to the given | |
5873 | * output. | |
5874 | * | |
9a654598 | 5875 | * Returns LTTNG_OK on success or a LTTNG_ERR error code. |
6dc3064a | 5876 | */ |
fb9a95c4 JG |
5877 | enum lttng_error_code ust_app_snapshot_record( |
5878 | const struct ltt_ust_session *usess, | |
5879 | const struct snapshot_output *output, int wait, | |
d07ceecd | 5880 | uint64_t nb_packets_per_stream) |
6dc3064a DG |
5881 | { |
5882 | int ret = 0; | |
9a654598 | 5883 | enum lttng_error_code status = LTTNG_OK; |
6dc3064a DG |
5884 | struct lttng_ht_iter iter; |
5885 | struct ust_app *app; | |
af706bb7 | 5886 | char pathname[PATH_MAX]; |
6dc3064a DG |
5887 | |
5888 | assert(usess); | |
5889 | assert(output); | |
5890 | ||
5891 | rcu_read_lock(); | |
5892 | ||
8c924c7b MD |
5893 | switch (usess->buffer_type) { |
5894 | case LTTNG_BUFFER_PER_UID: | |
5895 | { | |
5896 | struct buffer_reg_uid *reg; | |
6dc3064a | 5897 | |
8c924c7b MD |
5898 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
5899 | struct buffer_reg_channel *reg_chan; | |
5900 | struct consumer_socket *socket; | |
6dc3064a | 5901 | |
2b269489 JR |
5902 | if (!reg->registry->reg.ust->metadata_key) { |
5903 | /* Skip since no metadata is present */ | |
5904 | continue; | |
5905 | } | |
5906 | ||
8c924c7b MD |
5907 | /* Get consumer socket to use to push the metadata.*/ |
5908 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
5909 | usess->consumer); | |
5910 | if (!socket) { | |
9a654598 | 5911 | status = LTTNG_ERR_INVALID; |
8c924c7b MD |
5912 | goto error; |
5913 | } | |
6dc3064a | 5914 | |
8c924c7b | 5915 | memset(pathname, 0, sizeof(pathname)); |
d2956687 JG |
5916 | /* |
5917 | * DEFAULT_UST_TRACE_UID_PATH already contains a path | |
5918 | * separator. | |
5919 | */ | |
8c924c7b | 5920 | ret = snprintf(pathname, sizeof(pathname), |
d2956687 | 5921 | DEFAULT_UST_TRACE_DIR DEFAULT_UST_TRACE_UID_PATH, |
8c924c7b MD |
5922 | reg->uid, reg->bits_per_long); |
5923 | if (ret < 0) { | |
5924 | PERROR("snprintf snapshot path"); | |
9a654598 | 5925 | status = LTTNG_ERR_INVALID; |
8c924c7b MD |
5926 | goto error; |
5927 | } | |
5928 | ||
d2956687 | 5929 | /* Add the UST default trace dir to path. */ |
8c924c7b MD |
5930 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
5931 | reg_chan, node.node) { | |
9a654598 | 5932 | status = consumer_snapshot_channel(socket, |
e098433c JG |
5933 | reg_chan->consumer_key, |
5934 | output, 0, usess->uid, | |
5935 | usess->gid, pathname, wait, | |
d2956687 | 5936 | nb_packets_per_stream); |
9a654598 | 5937 | if (status != LTTNG_OK) { |
8c924c7b MD |
5938 | goto error; |
5939 | } | |
5940 | } | |
9a654598 | 5941 | status = consumer_snapshot_channel(socket, |
68808f4e | 5942 | reg->registry->reg.ust->metadata_key, output, 1, |
d2956687 | 5943 | usess->uid, usess->gid, pathname, wait, 0); |
9a654598 | 5944 | if (status != LTTNG_OK) { |
8c924c7b MD |
5945 | goto error; |
5946 | } | |
af706bb7 | 5947 | } |
8c924c7b MD |
5948 | break; |
5949 | } | |
5950 | case LTTNG_BUFFER_PER_PID: | |
5951 | { | |
5952 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5953 | struct consumer_socket *socket; | |
5954 | struct lttng_ht_iter chan_iter; | |
5955 | struct ust_app_channel *ua_chan; | |
5956 | struct ust_app_session *ua_sess; | |
5957 | struct ust_registry_session *registry; | |
5958 | ||
5959 | ua_sess = lookup_session_by_app(usess, app); | |
5960 | if (!ua_sess) { | |
5961 | /* Session not associated with this app. */ | |
5962 | continue; | |
5963 | } | |
af706bb7 | 5964 | |
8c924c7b MD |
5965 | /* Get the right consumer socket for the application. */ |
5966 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
5967 | output->consumer); | |
5968 | if (!socket) { | |
9a654598 | 5969 | status = LTTNG_ERR_INVALID; |
5c786ded JD |
5970 | goto error; |
5971 | } | |
5972 | ||
8c924c7b MD |
5973 | /* Add the UST default trace dir to path. */ |
5974 | memset(pathname, 0, sizeof(pathname)); | |
d2956687 | 5975 | ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "%s", |
8c924c7b | 5976 | ua_sess->path); |
6dc3064a | 5977 | if (ret < 0) { |
9a654598 | 5978 | status = LTTNG_ERR_INVALID; |
8c924c7b | 5979 | PERROR("snprintf snapshot path"); |
6dc3064a DG |
5980 | goto error; |
5981 | } | |
6dc3064a | 5982 | |
d2956687 | 5983 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, |
8c924c7b | 5984 | ua_chan, node.node) { |
9a654598 | 5985 | status = consumer_snapshot_channel(socket, |
e098433c JG |
5986 | ua_chan->key, output, |
5987 | 0, ua_sess->euid, ua_sess->egid, | |
5988 | pathname, wait, | |
d2956687 | 5989 | nb_packets_per_stream); |
9a654598 JG |
5990 | switch (status) { |
5991 | case LTTNG_OK: | |
5992 | break; | |
5993 | case LTTNG_ERR_CHAN_NOT_FOUND: | |
5994 | continue; | |
5995 | default: | |
8c924c7b MD |
5996 | goto error; |
5997 | } | |
5998 | } | |
5999 | ||
6000 | registry = get_session_registry(ua_sess); | |
fad1ed2f | 6001 | if (!registry) { |
9bbfb88c MD |
6002 | DBG("Application session is being torn down. Skip application."); |
6003 | continue; | |
fad1ed2f | 6004 | } |
9a654598 | 6005 | status = consumer_snapshot_channel(socket, |
e098433c JG |
6006 | registry->metadata_key, output, |
6007 | 1, ua_sess->euid, ua_sess->egid, | |
d2956687 | 6008 | pathname, wait, 0); |
9a654598 JG |
6009 | switch (status) { |
6010 | case LTTNG_OK: | |
6011 | break; | |
6012 | case LTTNG_ERR_CHAN_NOT_FOUND: | |
6013 | continue; | |
6014 | default: | |
8c924c7b MD |
6015 | goto error; |
6016 | } | |
6017 | } | |
6018 | break; | |
6019 | } | |
6020 | default: | |
6021 | assert(0); | |
6022 | break; | |
6dc3064a DG |
6023 | } |
6024 | ||
6025 | error: | |
6026 | rcu_read_unlock(); | |
9a654598 | 6027 | return status; |
6dc3064a | 6028 | } |
5c786ded JD |
6029 | |
6030 | /* | |
d07ceecd | 6031 | * Return the size taken by one more packet per stream. |
5c786ded | 6032 | */ |
fb9a95c4 JG |
6033 | uint64_t ust_app_get_size_one_more_packet_per_stream( |
6034 | const struct ltt_ust_session *usess, uint64_t cur_nr_packets) | |
5c786ded | 6035 | { |
d07ceecd | 6036 | uint64_t tot_size = 0; |
5c786ded JD |
6037 | struct ust_app *app; |
6038 | struct lttng_ht_iter iter; | |
6039 | ||
6040 | assert(usess); | |
6041 | ||
6042 | switch (usess->buffer_type) { | |
6043 | case LTTNG_BUFFER_PER_UID: | |
6044 | { | |
6045 | struct buffer_reg_uid *reg; | |
6046 | ||
6047 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
6048 | struct buffer_reg_channel *reg_chan; | |
6049 | ||
b7064eaa | 6050 | rcu_read_lock(); |
5c786ded JD |
6051 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
6052 | reg_chan, node.node) { | |
d07ceecd MD |
6053 | if (cur_nr_packets >= reg_chan->num_subbuf) { |
6054 | /* | |
6055 | * Don't take channel into account if we | |
6056 | * already grab all its packets. | |
6057 | */ | |
6058 | continue; | |
6059 | } | |
6060 | tot_size += reg_chan->subbuf_size * reg_chan->stream_count; | |
5c786ded | 6061 | } |
b7064eaa | 6062 | rcu_read_unlock(); |
5c786ded JD |
6063 | } |
6064 | break; | |
6065 | } | |
6066 | case LTTNG_BUFFER_PER_PID: | |
6067 | { | |
6068 | rcu_read_lock(); | |
6069 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6070 | struct ust_app_channel *ua_chan; | |
6071 | struct ust_app_session *ua_sess; | |
6072 | struct lttng_ht_iter chan_iter; | |
6073 | ||
6074 | ua_sess = lookup_session_by_app(usess, app); | |
6075 | if (!ua_sess) { | |
6076 | /* Session not associated with this app. */ | |
6077 | continue; | |
6078 | } | |
6079 | ||
6080 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
6081 | ua_chan, node.node) { | |
d07ceecd MD |
6082 | if (cur_nr_packets >= ua_chan->attr.num_subbuf) { |
6083 | /* | |
6084 | * Don't take channel into account if we | |
6085 | * already grab all its packets. | |
6086 | */ | |
6087 | continue; | |
6088 | } | |
6089 | tot_size += ua_chan->attr.subbuf_size * ua_chan->streams.count; | |
5c786ded JD |
6090 | } |
6091 | } | |
6092 | rcu_read_unlock(); | |
6093 | break; | |
6094 | } | |
6095 | default: | |
6096 | assert(0); | |
6097 | break; | |
6098 | } | |
6099 | ||
d07ceecd | 6100 | return tot_size; |
5c786ded | 6101 | } |
fb83fe64 JD |
6102 | |
6103 | int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id, | |
6104 | struct cds_list_head *buffer_reg_uid_list, | |
6105 | struct consumer_output *consumer, uint64_t uchan_id, | |
6106 | int overwrite, uint64_t *discarded, uint64_t *lost) | |
6107 | { | |
6108 | int ret; | |
6109 | uint64_t consumer_chan_key; | |
6110 | ||
70dd8162 MD |
6111 | *discarded = 0; |
6112 | *lost = 0; | |
6113 | ||
fb83fe64 | 6114 | ret = buffer_reg_uid_consumer_channel_key( |
76604852 | 6115 | buffer_reg_uid_list, uchan_id, &consumer_chan_key); |
fb83fe64 | 6116 | if (ret < 0) { |
70dd8162 MD |
6117 | /* Not found */ |
6118 | ret = 0; | |
fb83fe64 JD |
6119 | goto end; |
6120 | } | |
6121 | ||
6122 | if (overwrite) { | |
6123 | ret = consumer_get_lost_packets(ust_session_id, | |
6124 | consumer_chan_key, consumer, lost); | |
6125 | } else { | |
6126 | ret = consumer_get_discarded_events(ust_session_id, | |
6127 | consumer_chan_key, consumer, discarded); | |
6128 | } | |
6129 | ||
6130 | end: | |
6131 | return ret; | |
6132 | } | |
6133 | ||
6134 | int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess, | |
6135 | struct ltt_ust_channel *uchan, | |
6136 | struct consumer_output *consumer, int overwrite, | |
6137 | uint64_t *discarded, uint64_t *lost) | |
6138 | { | |
6139 | int ret = 0; | |
6140 | struct lttng_ht_iter iter; | |
6141 | struct lttng_ht_node_str *ua_chan_node; | |
6142 | struct ust_app *app; | |
6143 | struct ust_app_session *ua_sess; | |
6144 | struct ust_app_channel *ua_chan; | |
6145 | ||
70dd8162 MD |
6146 | *discarded = 0; |
6147 | *lost = 0; | |
6148 | ||
fb83fe64 JD |
6149 | rcu_read_lock(); |
6150 | /* | |
70dd8162 MD |
6151 | * Iterate over every registered applications. Sum counters for |
6152 | * all applications containing requested session and channel. | |
fb83fe64 JD |
6153 | */ |
6154 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6155 | struct lttng_ht_iter uiter; | |
6156 | ||
6157 | ua_sess = lookup_session_by_app(usess, app); | |
6158 | if (ua_sess == NULL) { | |
6159 | continue; | |
6160 | } | |
6161 | ||
6162 | /* Get channel */ | |
ee022399 | 6163 | lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &uiter); |
fb83fe64 JD |
6164 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); |
6165 | /* If the session is found for the app, the channel must be there */ | |
6166 | assert(ua_chan_node); | |
6167 | ||
6168 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
6169 | ||
6170 | if (overwrite) { | |
70dd8162 MD |
6171 | uint64_t _lost; |
6172 | ||
fb83fe64 | 6173 | ret = consumer_get_lost_packets(usess->id, ua_chan->key, |
70dd8162 MD |
6174 | consumer, &_lost); |
6175 | if (ret < 0) { | |
6176 | break; | |
6177 | } | |
6178 | (*lost) += _lost; | |
fb83fe64 | 6179 | } else { |
70dd8162 MD |
6180 | uint64_t _discarded; |
6181 | ||
fb83fe64 | 6182 | ret = consumer_get_discarded_events(usess->id, |
70dd8162 MD |
6183 | ua_chan->key, consumer, &_discarded); |
6184 | if (ret < 0) { | |
6185 | break; | |
6186 | } | |
6187 | (*discarded) += _discarded; | |
fb83fe64 | 6188 | } |
fb83fe64 JD |
6189 | } |
6190 | ||
fb83fe64 JD |
6191 | rcu_read_unlock(); |
6192 | return ret; | |
6193 | } | |
c2561365 JD |
6194 | |
6195 | static | |
6196 | int ust_app_regenerate_statedump(struct ltt_ust_session *usess, | |
6197 | struct ust_app *app) | |
6198 | { | |
6199 | int ret = 0; | |
6200 | struct ust_app_session *ua_sess; | |
6201 | ||
6202 | DBG("Regenerating the metadata for ust app pid %d", app->pid); | |
6203 | ||
6204 | rcu_read_lock(); | |
6205 | ||
6206 | ua_sess = lookup_session_by_app(usess, app); | |
6207 | if (ua_sess == NULL) { | |
6208 | /* The session is in teardown process. Ignore and continue. */ | |
6209 | goto end; | |
6210 | } | |
6211 | ||
6212 | pthread_mutex_lock(&ua_sess->lock); | |
6213 | ||
6214 | if (ua_sess->deleted) { | |
6215 | goto end_unlock; | |
6216 | } | |
6217 | ||
6218 | pthread_mutex_lock(&app->sock_lock); | |
6219 | ret = ustctl_regenerate_statedump(app->sock, ua_sess->handle); | |
6220 | pthread_mutex_unlock(&app->sock_lock); | |
6221 | ||
6222 | end_unlock: | |
6223 | pthread_mutex_unlock(&ua_sess->lock); | |
6224 | ||
6225 | end: | |
6226 | rcu_read_unlock(); | |
6227 | health_code_update(); | |
6228 | return ret; | |
6229 | } | |
6230 | ||
6231 | /* | |
6232 | * Regenerate the statedump for each app in the session. | |
6233 | */ | |
6234 | int ust_app_regenerate_statedump_all(struct ltt_ust_session *usess) | |
6235 | { | |
6236 | int ret = 0; | |
6237 | struct lttng_ht_iter iter; | |
6238 | struct ust_app *app; | |
6239 | ||
6240 | DBG("Regenerating the metadata for all UST apps"); | |
6241 | ||
6242 | rcu_read_lock(); | |
6243 | ||
6244 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6245 | if (!app->compatible) { | |
6246 | continue; | |
6247 | } | |
6248 | ||
6249 | ret = ust_app_regenerate_statedump(usess, app); | |
6250 | if (ret < 0) { | |
6251 | /* Continue to the next app even on error */ | |
6252 | continue; | |
6253 | } | |
6254 | } | |
6255 | ||
6256 | rcu_read_unlock(); | |
6257 | ||
6258 | return 0; | |
6259 | } | |
5c408ad8 JD |
6260 | |
6261 | /* | |
6262 | * Rotate all the channels of a session. | |
6263 | * | |
6f6d3b69 | 6264 | * Return LTTNG_OK on success or else an LTTng error code. |
5c408ad8 | 6265 | */ |
6f6d3b69 | 6266 | enum lttng_error_code ust_app_rotate_session(struct ltt_session *session) |
5c408ad8 | 6267 | { |
6f6d3b69 MD |
6268 | int ret; |
6269 | enum lttng_error_code cmd_ret = LTTNG_OK; | |
5c408ad8 JD |
6270 | struct lttng_ht_iter iter; |
6271 | struct ust_app *app; | |
6272 | struct ltt_ust_session *usess = session->ust_session; | |
5c408ad8 JD |
6273 | |
6274 | assert(usess); | |
6275 | ||
6276 | rcu_read_lock(); | |
6277 | ||
6278 | switch (usess->buffer_type) { | |
6279 | case LTTNG_BUFFER_PER_UID: | |
6280 | { | |
6281 | struct buffer_reg_uid *reg; | |
6282 | ||
6283 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
6284 | struct buffer_reg_channel *reg_chan; | |
6285 | struct consumer_socket *socket; | |
6286 | ||
6287 | /* Get consumer socket to use to push the metadata.*/ | |
6288 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
6289 | usess->consumer); | |
6290 | if (!socket) { | |
6f6d3b69 | 6291 | cmd_ret = LTTNG_ERR_INVALID; |
5c408ad8 JD |
6292 | goto error; |
6293 | } | |
6294 | ||
5c408ad8 JD |
6295 | /* Rotate the data channels. */ |
6296 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
6297 | reg_chan, node.node) { | |
5c408ad8 JD |
6298 | ret = consumer_rotate_channel(socket, |
6299 | reg_chan->consumer_key, | |
6300 | usess->uid, usess->gid, | |
d2956687 JG |
6301 | usess->consumer, |
6302 | /* is_metadata_channel */ false); | |
5c408ad8 | 6303 | if (ret < 0) { |
6f6d3b69 | 6304 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
6305 | goto error; |
6306 | } | |
6307 | } | |
6308 | ||
6309 | (void) push_metadata(reg->registry->reg.ust, usess->consumer); | |
6310 | ||
6311 | ret = consumer_rotate_channel(socket, | |
6312 | reg->registry->reg.ust->metadata_key, | |
6313 | usess->uid, usess->gid, | |
d2956687 JG |
6314 | usess->consumer, |
6315 | /* is_metadata_channel */ true); | |
5c408ad8 | 6316 | if (ret < 0) { |
6f6d3b69 | 6317 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
6318 | goto error; |
6319 | } | |
5c408ad8 JD |
6320 | } |
6321 | break; | |
6322 | } | |
6323 | case LTTNG_BUFFER_PER_PID: | |
6324 | { | |
6325 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6326 | struct consumer_socket *socket; | |
6327 | struct lttng_ht_iter chan_iter; | |
6328 | struct ust_app_channel *ua_chan; | |
6329 | struct ust_app_session *ua_sess; | |
6330 | struct ust_registry_session *registry; | |
6331 | ||
6332 | ua_sess = lookup_session_by_app(usess, app); | |
6333 | if (!ua_sess) { | |
6334 | /* Session not associated with this app. */ | |
6335 | continue; | |
6336 | } | |
5c408ad8 JD |
6337 | |
6338 | /* Get the right consumer socket for the application. */ | |
6339 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
6340 | usess->consumer); | |
6341 | if (!socket) { | |
6f6d3b69 | 6342 | cmd_ret = LTTNG_ERR_INVALID; |
5c408ad8 JD |
6343 | goto error; |
6344 | } | |
6345 | ||
6346 | registry = get_session_registry(ua_sess); | |
6347 | if (!registry) { | |
6f6d3b69 MD |
6348 | DBG("Application session is being torn down. Skip application."); |
6349 | continue; | |
5c408ad8 JD |
6350 | } |
6351 | ||
5c408ad8 JD |
6352 | /* Rotate the data channels. */ |
6353 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
6354 | ua_chan, node.node) { | |
5c408ad8 JD |
6355 | ret = consumer_rotate_channel(socket, ua_chan->key, |
6356 | ua_sess->euid, ua_sess->egid, | |
d2956687 JG |
6357 | ua_sess->consumer, |
6358 | /* is_metadata_channel */ false); | |
5c408ad8 | 6359 | if (ret < 0) { |
6f6d3b69 MD |
6360 | /* Per-PID buffer and application going away. */ |
6361 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) | |
6362 | continue; | |
6363 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; | |
5c408ad8 JD |
6364 | goto error; |
6365 | } | |
6366 | } | |
6367 | ||
6368 | /* Rotate the metadata channel. */ | |
6369 | (void) push_metadata(registry, usess->consumer); | |
6370 | ret = consumer_rotate_channel(socket, registry->metadata_key, | |
6371 | ua_sess->euid, ua_sess->egid, | |
d2956687 JG |
6372 | ua_sess->consumer, |
6373 | /* is_metadata_channel */ true); | |
5c408ad8 | 6374 | if (ret < 0) { |
6f6d3b69 MD |
6375 | /* Per-PID buffer and application going away. */ |
6376 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) | |
6377 | continue; | |
6378 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; | |
5c408ad8 JD |
6379 | goto error; |
6380 | } | |
5c408ad8 JD |
6381 | } |
6382 | break; | |
6383 | } | |
6384 | default: | |
6385 | assert(0); | |
6386 | break; | |
6387 | } | |
6388 | ||
6f6d3b69 | 6389 | cmd_ret = LTTNG_OK; |
5c408ad8 JD |
6390 | |
6391 | error: | |
6392 | rcu_read_unlock(); | |
6f6d3b69 | 6393 | return cmd_ret; |
5c408ad8 | 6394 | } |
d2956687 JG |
6395 | |
6396 | enum lttng_error_code ust_app_create_channel_subdirectories( | |
6397 | const struct ltt_ust_session *usess) | |
6398 | { | |
6399 | enum lttng_error_code ret = LTTNG_OK; | |
6400 | struct lttng_ht_iter iter; | |
6401 | enum lttng_trace_chunk_status chunk_status; | |
6402 | char *pathname_index; | |
6403 | int fmt_ret; | |
6404 | ||
6405 | assert(usess->current_trace_chunk); | |
6406 | rcu_read_lock(); | |
6407 | ||
6408 | switch (usess->buffer_type) { | |
6409 | case LTTNG_BUFFER_PER_UID: | |
6410 | { | |
6411 | struct buffer_reg_uid *reg; | |
6412 | ||
6413 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
6414 | fmt_ret = asprintf(&pathname_index, | |
6415 | DEFAULT_UST_TRACE_DIR DEFAULT_UST_TRACE_UID_PATH "/" DEFAULT_INDEX_DIR, | |
6416 | reg->uid, reg->bits_per_long); | |
6417 | if (fmt_ret < 0) { | |
6418 | ERR("Failed to format channel index directory"); | |
6419 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
6420 | goto error; | |
6421 | } | |
6422 | ||
6423 | /* | |
6424 | * Create the index subdirectory which will take care | |
6425 | * of implicitly creating the channel's path. | |
6426 | */ | |
6427 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
6428 | usess->current_trace_chunk, | |
6429 | pathname_index); | |
6430 | free(pathname_index); | |
6431 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
6432 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
6433 | goto error; | |
6434 | } | |
6435 | } | |
6436 | break; | |
6437 | } | |
6438 | case LTTNG_BUFFER_PER_PID: | |
6439 | { | |
6440 | struct ust_app *app; | |
6441 | ||
6442 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, | |
6443 | pid_n.node) { | |
6444 | struct ust_app_session *ua_sess; | |
6445 | struct ust_registry_session *registry; | |
6446 | ||
6447 | ua_sess = lookup_session_by_app(usess, app); | |
6448 | if (!ua_sess) { | |
6449 | /* Session not associated with this app. */ | |
6450 | continue; | |
6451 | } | |
6452 | ||
6453 | registry = get_session_registry(ua_sess); | |
6454 | if (!registry) { | |
6455 | DBG("Application session is being torn down. Skip application."); | |
6456 | continue; | |
6457 | } | |
6458 | ||
6459 | fmt_ret = asprintf(&pathname_index, | |
6460 | DEFAULT_UST_TRACE_DIR "%s/" DEFAULT_INDEX_DIR, | |
6461 | ua_sess->path); | |
6462 | if (fmt_ret < 0) { | |
6463 | ERR("Failed to format channel index directory"); | |
6464 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
6465 | goto error; | |
6466 | } | |
6467 | /* | |
6468 | * Create the index subdirectory which will take care | |
6469 | * of implicitly creating the channel's path. | |
6470 | */ | |
6471 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
6472 | usess->current_trace_chunk, | |
6473 | pathname_index); | |
6474 | free(pathname_index); | |
6475 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
6476 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
6477 | goto error; | |
6478 | } | |
6479 | } | |
6480 | break; | |
6481 | } | |
6482 | default: | |
6483 | abort(); | |
6484 | } | |
6485 | ||
6486 | ret = LTTNG_OK; | |
6487 | error: | |
6488 | rcu_read_unlock(); | |
6489 | return ret; | |
6490 | } |