Commit | Line | Data |
---|---|---|
91d76f53 DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
bdf64013 | 3 | * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
91d76f53 | 4 | * |
d14d33bf AM |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
91d76f53 DG |
8 | * |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
d14d33bf AM |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
91d76f53 DG |
17 | */ |
18 | ||
6c1c0768 | 19 | #define _LGPL_SOURCE |
91d76f53 | 20 | #include <errno.h> |
7972aab2 | 21 | #include <inttypes.h> |
91d76f53 DG |
22 | #include <pthread.h> |
23 | #include <stdio.h> | |
24 | #include <stdlib.h> | |
099e26bd | 25 | #include <string.h> |
aba8e916 DG |
26 | #include <sys/stat.h> |
27 | #include <sys/types.h> | |
099e26bd | 28 | #include <unistd.h> |
0df502fd | 29 | #include <urcu/compiler.h> |
fb54cdbf | 30 | #include <lttng/ust-error.h> |
331744e3 | 31 | #include <signal.h> |
bec39940 | 32 | |
990570ed | 33 | #include <common/common.h> |
86acf0da | 34 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 35 | |
7972aab2 | 36 | #include "buffer-registry.h" |
86acf0da | 37 | #include "fd-limit.h" |
8782cc74 | 38 | #include "health-sessiond.h" |
56fff090 | 39 | #include "ust-app.h" |
48842b30 | 40 | #include "ust-consumer.h" |
d80a6244 | 41 | #include "ust-ctl.h" |
0b2dc8df | 42 | #include "utils.h" |
fb83fe64 | 43 | #include "session.h" |
e9404c27 JG |
44 | #include "lttng-sessiond.h" |
45 | #include "notification-thread-commands.h" | |
5c408ad8 | 46 | #include "rotate.h" |
d80a6244 | 47 | |
c4b88406 MD |
48 | static |
49 | int ust_app_flush_app_session(struct ust_app *app, struct ust_app_session *ua_sess); | |
50 | ||
d9bf3ca4 MD |
51 | /* Next available channel key. Access under next_channel_key_lock. */ |
52 | static uint64_t _next_channel_key; | |
53 | static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER; | |
54 | ||
55 | /* Next available session ID. Access under next_session_id_lock. */ | |
56 | static uint64_t _next_session_id; | |
57 | static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER; | |
ffe60014 DG |
58 | |
59 | /* | |
d9bf3ca4 | 60 | * Return the incremented value of next_channel_key. |
ffe60014 | 61 | */ |
d9bf3ca4 | 62 | static uint64_t get_next_channel_key(void) |
ffe60014 | 63 | { |
d9bf3ca4 MD |
64 | uint64_t ret; |
65 | ||
66 | pthread_mutex_lock(&next_channel_key_lock); | |
67 | ret = ++_next_channel_key; | |
68 | pthread_mutex_unlock(&next_channel_key_lock); | |
69 | return ret; | |
ffe60014 DG |
70 | } |
71 | ||
72 | /* | |
7972aab2 | 73 | * Return the atomically incremented value of next_session_id. |
ffe60014 | 74 | */ |
d9bf3ca4 | 75 | static uint64_t get_next_session_id(void) |
ffe60014 | 76 | { |
d9bf3ca4 MD |
77 | uint64_t ret; |
78 | ||
79 | pthread_mutex_lock(&next_session_id_lock); | |
80 | ret = ++_next_session_id; | |
81 | pthread_mutex_unlock(&next_session_id_lock); | |
82 | return ret; | |
ffe60014 DG |
83 | } |
84 | ||
d65d2de8 DG |
85 | static void copy_channel_attr_to_ustctl( |
86 | struct ustctl_consumer_channel_attr *attr, | |
87 | struct lttng_ust_channel_attr *uattr) | |
88 | { | |
89 | /* Copy event attributes since the layout is different. */ | |
90 | attr->subbuf_size = uattr->subbuf_size; | |
91 | attr->num_subbuf = uattr->num_subbuf; | |
92 | attr->overwrite = uattr->overwrite; | |
93 | attr->switch_timer_interval = uattr->switch_timer_interval; | |
94 | attr->read_timer_interval = uattr->read_timer_interval; | |
95 | attr->output = uattr->output; | |
491d1539 | 96 | attr->blocking_timeout = uattr->u.s.blocking_timeout; |
d65d2de8 DG |
97 | } |
98 | ||
025faf73 DG |
99 | /* |
100 | * Match function for the hash table lookup. | |
101 | * | |
102 | * It matches an ust app event based on three attributes which are the event | |
103 | * name, the filter bytecode and the loglevel. | |
104 | */ | |
18eace3b DG |
105 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
106 | { | |
107 | struct ust_app_event *event; | |
108 | const struct ust_app_ht_key *key; | |
2106efa0 | 109 | int ev_loglevel_value; |
18eace3b DG |
110 | |
111 | assert(node); | |
112 | assert(_key); | |
113 | ||
114 | event = caa_container_of(node, struct ust_app_event, node.node); | |
115 | key = _key; | |
2106efa0 | 116 | ev_loglevel_value = event->attr.loglevel; |
18eace3b | 117 | |
1af53eb5 | 118 | /* Match the 4 elements of the key: name, filter, loglevel, exclusions */ |
18eace3b DG |
119 | |
120 | /* Event name */ | |
121 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
122 | goto no_match; | |
123 | } | |
124 | ||
125 | /* Event loglevel. */ | |
2106efa0 | 126 | if (ev_loglevel_value != key->loglevel_type) { |
025faf73 | 127 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
2106efa0 PP |
128 | && key->loglevel_type == 0 && |
129 | ev_loglevel_value == -1) { | |
025faf73 DG |
130 | /* |
131 | * Match is accepted. This is because on event creation, the | |
132 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
133 | * -1 are accepted for this loglevel type since 0 is the one set by | |
134 | * the API when receiving an enable event. | |
135 | */ | |
136 | } else { | |
137 | goto no_match; | |
138 | } | |
18eace3b DG |
139 | } |
140 | ||
141 | /* One of the filters is NULL, fail. */ | |
142 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
143 | goto no_match; | |
144 | } | |
145 | ||
025faf73 DG |
146 | if (key->filter && event->filter) { |
147 | /* Both filters exists, check length followed by the bytecode. */ | |
148 | if (event->filter->len != key->filter->len || | |
149 | memcmp(event->filter->data, key->filter->data, | |
150 | event->filter->len) != 0) { | |
151 | goto no_match; | |
152 | } | |
18eace3b DG |
153 | } |
154 | ||
1af53eb5 JI |
155 | /* One of the exclusions is NULL, fail. */ |
156 | if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) { | |
157 | goto no_match; | |
158 | } | |
159 | ||
160 | if (key->exclusion && event->exclusion) { | |
161 | /* Both exclusions exists, check count followed by the names. */ | |
162 | if (event->exclusion->count != key->exclusion->count || | |
163 | memcmp(event->exclusion->names, key->exclusion->names, | |
164 | event->exclusion->count * LTTNG_UST_SYM_NAME_LEN) != 0) { | |
165 | goto no_match; | |
166 | } | |
167 | } | |
168 | ||
169 | ||
025faf73 | 170 | /* Match. */ |
18eace3b DG |
171 | return 1; |
172 | ||
173 | no_match: | |
174 | return 0; | |
18eace3b DG |
175 | } |
176 | ||
025faf73 DG |
177 | /* |
178 | * Unique add of an ust app event in the given ht. This uses the custom | |
179 | * ht_match_ust_app_event match function and the event name as hash. | |
180 | */ | |
d0b96690 | 181 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
182 | struct ust_app_event *event) |
183 | { | |
184 | struct cds_lfht_node *node_ptr; | |
185 | struct ust_app_ht_key key; | |
d0b96690 | 186 | struct lttng_ht *ht; |
18eace3b | 187 | |
d0b96690 DG |
188 | assert(ua_chan); |
189 | assert(ua_chan->events); | |
18eace3b DG |
190 | assert(event); |
191 | ||
d0b96690 | 192 | ht = ua_chan->events; |
18eace3b DG |
193 | key.name = event->attr.name; |
194 | key.filter = event->filter; | |
2106efa0 | 195 | key.loglevel_type = event->attr.loglevel; |
91c89f23 | 196 | key.exclusion = event->exclusion; |
18eace3b DG |
197 | |
198 | node_ptr = cds_lfht_add_unique(ht->ht, | |
199 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
200 | ht_match_ust_app_event, &key, &event->node.node); | |
201 | assert(node_ptr == &event->node.node); | |
202 | } | |
203 | ||
d88aee68 DG |
204 | /* |
205 | * Close the notify socket from the given RCU head object. This MUST be called | |
206 | * through a call_rcu(). | |
207 | */ | |
208 | static void close_notify_sock_rcu(struct rcu_head *head) | |
209 | { | |
210 | int ret; | |
211 | struct ust_app_notify_sock_obj *obj = | |
212 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
213 | ||
214 | /* Must have a valid fd here. */ | |
215 | assert(obj->fd >= 0); | |
216 | ||
217 | ret = close(obj->fd); | |
218 | if (ret) { | |
219 | ERR("close notify sock %d RCU", obj->fd); | |
220 | } | |
221 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
222 | ||
223 | free(obj); | |
224 | } | |
225 | ||
7972aab2 DG |
226 | /* |
227 | * Return the session registry according to the buffer type of the given | |
228 | * session. | |
229 | * | |
230 | * A registry per UID object MUST exists before calling this function or else | |
231 | * it assert() if not found. RCU read side lock must be acquired. | |
232 | */ | |
233 | static struct ust_registry_session *get_session_registry( | |
234 | struct ust_app_session *ua_sess) | |
235 | { | |
236 | struct ust_registry_session *registry = NULL; | |
237 | ||
238 | assert(ua_sess); | |
239 | ||
240 | switch (ua_sess->buffer_type) { | |
241 | case LTTNG_BUFFER_PER_PID: | |
242 | { | |
243 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
244 | if (!reg_pid) { | |
245 | goto error; | |
246 | } | |
247 | registry = reg_pid->registry->reg.ust; | |
248 | break; | |
249 | } | |
250 | case LTTNG_BUFFER_PER_UID: | |
251 | { | |
252 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
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(); | |
440 | } | |
441 | ||
d80a6244 DG |
442 | /* |
443 | * Delete ust app channel safely. RCU read lock must be held before calling | |
444 | * this function. | |
82cac6d2 JG |
445 | * |
446 | * The session list lock must be held by the caller. | |
d80a6244 | 447 | */ |
8b366481 | 448 | static |
d0b96690 DG |
449 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
450 | struct ust_app *app) | |
d80a6244 DG |
451 | { |
452 | int ret; | |
bec39940 | 453 | struct lttng_ht_iter iter; |
d80a6244 | 454 | struct ust_app_event *ua_event; |
55cc08a6 | 455 | struct ust_app_ctx *ua_ctx; |
030a66fa | 456 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 457 | struct ust_registry_session *registry; |
d80a6244 | 458 | |
ffe60014 DG |
459 | assert(ua_chan); |
460 | ||
461 | DBG3("UST app deleting channel %s", ua_chan->name); | |
462 | ||
55cc08a6 | 463 | /* Wipe stream */ |
d80a6244 | 464 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 465 | cds_list_del(&stream->list); |
fb45065e | 466 | delete_ust_app_stream(sock, stream, app); |
d80a6244 DG |
467 | } |
468 | ||
55cc08a6 | 469 | /* Wipe context */ |
bec39940 | 470 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
31746f93 | 471 | cds_list_del(&ua_ctx->list); |
bec39940 | 472 | ret = lttng_ht_del(ua_chan->ctx, &iter); |
55cc08a6 | 473 | assert(!ret); |
fb45065e | 474 | delete_ust_app_ctx(sock, ua_ctx, app); |
55cc08a6 | 475 | } |
d80a6244 | 476 | |
55cc08a6 | 477 | /* Wipe events */ |
bec39940 DG |
478 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
479 | node.node) { | |
480 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 481 | assert(!ret); |
fb45065e | 482 | delete_ust_app_event(sock, ua_event, app); |
d80a6244 | 483 | } |
edb67388 | 484 | |
c8335706 MD |
485 | if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) { |
486 | /* Wipe and free registry from session registry. */ | |
487 | registry = get_session_registry(ua_chan->session); | |
488 | if (registry) { | |
e9404c27 | 489 | ust_registry_channel_del_free(registry, ua_chan->key, |
e38d96f9 MD |
490 | sock >= 0); |
491 | } | |
492 | if (sock >= 0) { | |
493 | save_per_pid_lost_discarded_counters(ua_chan); | |
c8335706 | 494 | } |
7972aab2 | 495 | } |
d0b96690 | 496 | |
edb67388 | 497 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
498 | /* Remove channel from application UST object descriptor. */ |
499 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
c6e62271 DG |
500 | ret = lttng_ht_del(app->ust_objd, &iter); |
501 | assert(!ret); | |
fb45065e | 502 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 503 | ret = ustctl_release_object(sock, ua_chan->obj); |
fb45065e | 504 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
505 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
506 | ERR("UST app sock %d release channel obj failed with ret %d", | |
507 | sock, ret); | |
508 | } | |
7972aab2 | 509 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
510 | free(ua_chan->obj); |
511 | } | |
36b588ed | 512 | call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); |
d80a6244 DG |
513 | } |
514 | ||
fb45065e MD |
515 | int ust_app_register_done(struct ust_app *app) |
516 | { | |
517 | int ret; | |
518 | ||
519 | pthread_mutex_lock(&app->sock_lock); | |
520 | ret = ustctl_register_done(app->sock); | |
521 | pthread_mutex_unlock(&app->sock_lock); | |
522 | return ret; | |
523 | } | |
524 | ||
525 | int ust_app_release_object(struct ust_app *app, struct lttng_ust_object_data *data) | |
526 | { | |
527 | int ret, sock; | |
528 | ||
529 | if (app) { | |
530 | pthread_mutex_lock(&app->sock_lock); | |
531 | sock = app->sock; | |
532 | } else { | |
533 | sock = -1; | |
534 | } | |
535 | ret = ustctl_release_object(sock, data); | |
536 | if (app) { | |
537 | pthread_mutex_unlock(&app->sock_lock); | |
538 | } | |
539 | return ret; | |
540 | } | |
541 | ||
331744e3 | 542 | /* |
1b532a60 DG |
543 | * Push metadata to consumer socket. |
544 | * | |
dc2bbdae MD |
545 | * RCU read-side lock must be held to guarantee existance of socket. |
546 | * Must be called with the ust app session lock held. | |
547 | * Must be called with the registry lock held. | |
331744e3 JD |
548 | * |
549 | * On success, return the len of metadata pushed or else a negative value. | |
2c57e06d MD |
550 | * Returning a -EPIPE return value means we could not send the metadata, |
551 | * but it can be caused by recoverable errors (e.g. the application has | |
552 | * terminated concurrently). | |
331744e3 JD |
553 | */ |
554 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
555 | struct consumer_socket *socket, int send_zero_data) | |
556 | { | |
557 | int ret; | |
558 | char *metadata_str = NULL; | |
c585821b | 559 | size_t len, offset, new_metadata_len_sent; |
331744e3 | 560 | ssize_t ret_val; |
93ec662e | 561 | uint64_t metadata_key, metadata_version; |
331744e3 JD |
562 | |
563 | assert(registry); | |
564 | assert(socket); | |
1b532a60 | 565 | |
c585821b MD |
566 | metadata_key = registry->metadata_key; |
567 | ||
ce34fcd0 | 568 | /* |
dc2bbdae MD |
569 | * Means that no metadata was assigned to the session. This can |
570 | * happens if no start has been done previously. | |
ce34fcd0 | 571 | */ |
c585821b | 572 | if (!metadata_key) { |
ce34fcd0 MD |
573 | return 0; |
574 | } | |
575 | ||
331744e3 JD |
576 | offset = registry->metadata_len_sent; |
577 | len = registry->metadata_len - registry->metadata_len_sent; | |
c585821b | 578 | new_metadata_len_sent = registry->metadata_len; |
93ec662e | 579 | metadata_version = registry->metadata_version; |
331744e3 JD |
580 | if (len == 0) { |
581 | DBG3("No metadata to push for metadata key %" PRIu64, | |
582 | registry->metadata_key); | |
583 | ret_val = len; | |
584 | if (send_zero_data) { | |
585 | DBG("No metadata to push"); | |
586 | goto push_data; | |
587 | } | |
588 | goto end; | |
589 | } | |
590 | ||
591 | /* Allocate only what we have to send. */ | |
592 | metadata_str = zmalloc(len); | |
593 | if (!metadata_str) { | |
594 | PERROR("zmalloc ust app metadata string"); | |
595 | ret_val = -ENOMEM; | |
596 | goto error; | |
597 | } | |
c585821b | 598 | /* Copy what we haven't sent out. */ |
331744e3 | 599 | memcpy(metadata_str, registry->metadata + offset, len); |
331744e3 JD |
600 | |
601 | push_data: | |
c585821b MD |
602 | pthread_mutex_unlock(®istry->lock); |
603 | /* | |
604 | * We need to unlock the registry while we push metadata to | |
605 | * break a circular dependency between the consumerd metadata | |
606 | * lock and the sessiond registry lock. Indeed, pushing metadata | |
607 | * to the consumerd awaits that it gets pushed all the way to | |
608 | * relayd, but doing so requires grabbing the metadata lock. If | |
609 | * a concurrent metadata request is being performed by | |
610 | * consumerd, this can try to grab the registry lock on the | |
611 | * sessiond while holding the metadata lock on the consumer | |
612 | * daemon. Those push and pull schemes are performed on two | |
613 | * different bidirectionnal communication sockets. | |
614 | */ | |
615 | ret = consumer_push_metadata(socket, metadata_key, | |
93ec662e | 616 | metadata_str, len, offset, metadata_version); |
c585821b | 617 | pthread_mutex_lock(®istry->lock); |
331744e3 | 618 | if (ret < 0) { |
000baf6a | 619 | /* |
dc2bbdae MD |
620 | * There is an acceptable race here between the registry |
621 | * metadata key assignment and the creation on the | |
622 | * consumer. The session daemon can concurrently push | |
623 | * metadata for this registry while being created on the | |
624 | * consumer since the metadata key of the registry is | |
625 | * assigned *before* it is setup to avoid the consumer | |
626 | * to ask for metadata that could possibly be not found | |
627 | * in the session daemon. | |
000baf6a | 628 | * |
dc2bbdae MD |
629 | * The metadata will get pushed either by the session |
630 | * being stopped or the consumer requesting metadata if | |
631 | * that race is triggered. | |
000baf6a DG |
632 | */ |
633 | if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) { | |
634 | ret = 0; | |
c585821b MD |
635 | } else { |
636 | ERR("Error pushing metadata to consumer"); | |
000baf6a | 637 | } |
331744e3 JD |
638 | ret_val = ret; |
639 | goto error_push; | |
c585821b MD |
640 | } else { |
641 | /* | |
642 | * Metadata may have been concurrently pushed, since | |
643 | * we're not holding the registry lock while pushing to | |
644 | * consumer. This is handled by the fact that we send | |
645 | * the metadata content, size, and the offset at which | |
646 | * that metadata belongs. This may arrive out of order | |
647 | * on the consumer side, and the consumer is able to | |
648 | * deal with overlapping fragments. The consumer | |
649 | * supports overlapping fragments, which must be | |
650 | * contiguous starting from offset 0. We keep the | |
651 | * largest metadata_len_sent value of the concurrent | |
652 | * send. | |
653 | */ | |
654 | registry->metadata_len_sent = | |
655 | max_t(size_t, registry->metadata_len_sent, | |
656 | new_metadata_len_sent); | |
331744e3 | 657 | } |
331744e3 JD |
658 | free(metadata_str); |
659 | return len; | |
660 | ||
661 | end: | |
662 | error: | |
ce34fcd0 MD |
663 | if (ret_val) { |
664 | /* | |
dc2bbdae MD |
665 | * On error, flag the registry that the metadata is |
666 | * closed. We were unable to push anything and this | |
667 | * means that either the consumer is not responding or | |
668 | * the metadata cache has been destroyed on the | |
669 | * consumer. | |
ce34fcd0 MD |
670 | */ |
671 | registry->metadata_closed = 1; | |
672 | } | |
331744e3 JD |
673 | error_push: |
674 | free(metadata_str); | |
675 | return ret_val; | |
676 | } | |
677 | ||
d88aee68 | 678 | /* |
ce34fcd0 | 679 | * For a given application and session, push metadata to consumer. |
331744e3 JD |
680 | * Either sock or consumer is required : if sock is NULL, the default |
681 | * socket to send the metadata is retrieved from consumer, if sock | |
682 | * is not NULL we use it to send the metadata. | |
ce34fcd0 | 683 | * RCU read-side lock must be held while calling this function, |
dc2bbdae MD |
684 | * therefore ensuring existance of registry. It also ensures existance |
685 | * of socket throughout this function. | |
d88aee68 DG |
686 | * |
687 | * Return 0 on success else a negative error. | |
2c57e06d MD |
688 | * Returning a -EPIPE return value means we could not send the metadata, |
689 | * but it can be caused by recoverable errors (e.g. the application has | |
690 | * terminated concurrently). | |
d88aee68 | 691 | */ |
7972aab2 DG |
692 | static int push_metadata(struct ust_registry_session *registry, |
693 | struct consumer_output *consumer) | |
d88aee68 | 694 | { |
331744e3 JD |
695 | int ret_val; |
696 | ssize_t ret; | |
d88aee68 DG |
697 | struct consumer_socket *socket; |
698 | ||
7972aab2 DG |
699 | assert(registry); |
700 | assert(consumer); | |
701 | ||
ce34fcd0 | 702 | pthread_mutex_lock(®istry->lock); |
ce34fcd0 | 703 | if (registry->metadata_closed) { |
dc2bbdae MD |
704 | ret_val = -EPIPE; |
705 | goto error; | |
d88aee68 DG |
706 | } |
707 | ||
d88aee68 | 708 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
709 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
710 | consumer); | |
d88aee68 | 711 | if (!socket) { |
331744e3 | 712 | ret_val = -1; |
ce34fcd0 | 713 | goto error; |
d88aee68 DG |
714 | } |
715 | ||
331744e3 | 716 | ret = ust_app_push_metadata(registry, socket, 0); |
d88aee68 | 717 | if (ret < 0) { |
331744e3 | 718 | ret_val = ret; |
ce34fcd0 | 719 | goto error; |
d88aee68 | 720 | } |
dc2bbdae | 721 | pthread_mutex_unlock(®istry->lock); |
d88aee68 DG |
722 | return 0; |
723 | ||
ce34fcd0 | 724 | error: |
dc2bbdae | 725 | pthread_mutex_unlock(®istry->lock); |
331744e3 | 726 | return ret_val; |
d88aee68 DG |
727 | } |
728 | ||
729 | /* | |
730 | * Send to the consumer a close metadata command for the given session. Once | |
731 | * done, the metadata channel is deleted and the session metadata pointer is | |
dc2bbdae | 732 | * nullified. The session lock MUST be held unless the application is |
d88aee68 DG |
733 | * in the destroy path. |
734 | * | |
735 | * Return 0 on success else a negative value. | |
736 | */ | |
7972aab2 DG |
737 | static int close_metadata(struct ust_registry_session *registry, |
738 | struct consumer_output *consumer) | |
d88aee68 DG |
739 | { |
740 | int ret; | |
741 | struct consumer_socket *socket; | |
742 | ||
7972aab2 DG |
743 | assert(registry); |
744 | assert(consumer); | |
d88aee68 | 745 | |
7972aab2 DG |
746 | rcu_read_lock(); |
747 | ||
ce34fcd0 MD |
748 | pthread_mutex_lock(®istry->lock); |
749 | ||
7972aab2 | 750 | if (!registry->metadata_key || registry->metadata_closed) { |
d88aee68 | 751 | ret = 0; |
1b532a60 | 752 | goto end; |
d88aee68 DG |
753 | } |
754 | ||
d88aee68 | 755 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
756 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
757 | consumer); | |
d88aee68 DG |
758 | if (!socket) { |
759 | ret = -1; | |
7972aab2 | 760 | goto error; |
d88aee68 DG |
761 | } |
762 | ||
7972aab2 | 763 | ret = consumer_close_metadata(socket, registry->metadata_key); |
d88aee68 | 764 | if (ret < 0) { |
7972aab2 | 765 | goto error; |
d88aee68 DG |
766 | } |
767 | ||
d88aee68 | 768 | error: |
1b532a60 DG |
769 | /* |
770 | * Metadata closed. Even on error this means that the consumer is not | |
771 | * responding or not found so either way a second close should NOT be emit | |
772 | * for this registry. | |
773 | */ | |
774 | registry->metadata_closed = 1; | |
775 | end: | |
ce34fcd0 | 776 | pthread_mutex_unlock(®istry->lock); |
7972aab2 | 777 | rcu_read_unlock(); |
d88aee68 DG |
778 | return ret; |
779 | } | |
780 | ||
36b588ed MD |
781 | /* |
782 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
783 | * section and outside of call_rcu thread, so we postpone its execution |
784 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
785 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
786 | */ |
787 | static | |
788 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
789 | { | |
790 | struct ust_app_session *ua_sess = | |
791 | caa_container_of(head, struct ust_app_session, rcu_head); | |
792 | ||
0b2dc8df | 793 | ht_cleanup_push(ua_sess->channels); |
36b588ed MD |
794 | free(ua_sess); |
795 | } | |
796 | ||
d80a6244 DG |
797 | /* |
798 | * Delete ust app session safely. RCU read lock must be held before calling | |
799 | * this function. | |
82cac6d2 JG |
800 | * |
801 | * The session list lock must be held by the caller. | |
d80a6244 | 802 | */ |
8b366481 | 803 | static |
d0b96690 DG |
804 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
805 | struct ust_app *app) | |
d80a6244 DG |
806 | { |
807 | int ret; | |
bec39940 | 808 | struct lttng_ht_iter iter; |
d80a6244 | 809 | struct ust_app_channel *ua_chan; |
7972aab2 | 810 | struct ust_registry_session *registry; |
d80a6244 | 811 | |
d88aee68 DG |
812 | assert(ua_sess); |
813 | ||
1b532a60 DG |
814 | pthread_mutex_lock(&ua_sess->lock); |
815 | ||
b161602a MD |
816 | assert(!ua_sess->deleted); |
817 | ua_sess->deleted = true; | |
818 | ||
7972aab2 | 819 | registry = get_session_registry(ua_sess); |
fad1ed2f | 820 | /* Registry can be null on error path during initialization. */ |
ce34fcd0 | 821 | if (registry) { |
d88aee68 | 822 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 823 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 824 | |
7972aab2 DG |
825 | /* |
826 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
827 | * metadata only on destroy trace session in this case. Also, the |
828 | * previous push metadata could have flag the metadata registry to | |
829 | * close so don't send a close command if closed. | |
7972aab2 | 830 | */ |
ce34fcd0 | 831 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
832 | /* And ask to close it for this session registry. */ |
833 | (void) close_metadata(registry, ua_sess->consumer); | |
834 | } | |
d80a6244 DG |
835 | } |
836 | ||
bec39940 DG |
837 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
838 | node.node) { | |
839 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 840 | assert(!ret); |
d0b96690 | 841 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 842 | } |
d80a6244 | 843 | |
7972aab2 DG |
844 | /* In case of per PID, the registry is kept in the session. */ |
845 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
846 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
847 | if (reg_pid) { | |
fad1ed2f JR |
848 | /* |
849 | * Registry can be null on error path during | |
850 | * initialization. | |
851 | */ | |
7972aab2 DG |
852 | buffer_reg_pid_remove(reg_pid); |
853 | buffer_reg_pid_destroy(reg_pid); | |
854 | } | |
855 | } | |
d0b96690 | 856 | |
aee6bafd | 857 | if (ua_sess->handle != -1) { |
fb45065e | 858 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 859 | ret = ustctl_release_handle(sock, ua_sess->handle); |
fb45065e | 860 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
861 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
862 | ERR("UST app sock %d release session handle failed with ret %d", | |
863 | sock, ret); | |
864 | } | |
10b56aef MD |
865 | /* Remove session from application UST object descriptor. */ |
866 | iter.iter.node = &ua_sess->ust_objd_node.node; | |
867 | ret = lttng_ht_del(app->ust_sessions_objd, &iter); | |
868 | assert(!ret); | |
aee6bafd | 869 | } |
10b56aef | 870 | |
1b532a60 DG |
871 | pthread_mutex_unlock(&ua_sess->lock); |
872 | ||
6addfa37 MD |
873 | consumer_output_put(ua_sess->consumer); |
874 | ||
36b588ed | 875 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 876 | } |
91d76f53 DG |
877 | |
878 | /* | |
284d8f55 DG |
879 | * Delete a traceable application structure from the global list. Never call |
880 | * this function outside of a call_rcu call. | |
36b588ed MD |
881 | * |
882 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 883 | */ |
8b366481 DG |
884 | static |
885 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 886 | { |
8b366481 | 887 | int ret, sock; |
d42f20df | 888 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 889 | |
82cac6d2 JG |
890 | /* |
891 | * The session list lock must be held during this function to guarantee | |
892 | * the existence of ua_sess. | |
893 | */ | |
894 | session_lock_list(); | |
d80a6244 | 895 | /* Delete ust app sessions info */ |
852d0037 DG |
896 | sock = app->sock; |
897 | app->sock = -1; | |
d80a6244 | 898 | |
8b366481 | 899 | /* Wipe sessions */ |
d42f20df DG |
900 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
901 | teardown_node) { | |
902 | /* Free every object in the session and the session. */ | |
36b588ed | 903 | rcu_read_lock(); |
d0b96690 | 904 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 905 | rcu_read_unlock(); |
d80a6244 | 906 | } |
36b588ed | 907 | |
0b2dc8df | 908 | ht_cleanup_push(app->sessions); |
10b56aef | 909 | ht_cleanup_push(app->ust_sessions_objd); |
0b2dc8df | 910 | ht_cleanup_push(app->ust_objd); |
d80a6244 | 911 | |
6414a713 | 912 | /* |
852d0037 DG |
913 | * Wait until we have deleted the application from the sock hash table |
914 | * before closing this socket, otherwise an application could re-use the | |
915 | * socket ID and race with the teardown, using the same hash table entry. | |
916 | * | |
917 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
918 | * all RCU readers that could run concurrently with unregister app, | |
919 | * therefore we _need_ to only close that socket after a grace period. So | |
920 | * it should stay in this RCU callback. | |
921 | * | |
922 | * This close() is a very important step of the synchronization model so | |
923 | * every modification to this function must be carefully reviewed. | |
6414a713 | 924 | */ |
799e2c4f MD |
925 | ret = close(sock); |
926 | if (ret) { | |
927 | PERROR("close"); | |
928 | } | |
4063050c | 929 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 930 | |
852d0037 | 931 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 932 | free(app); |
82cac6d2 | 933 | session_unlock_list(); |
099e26bd DG |
934 | } |
935 | ||
936 | /* | |
f6a9efaa | 937 | * URCU intermediate call to delete an UST app. |
099e26bd | 938 | */ |
8b366481 DG |
939 | static |
940 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 941 | { |
bec39940 DG |
942 | struct lttng_ht_node_ulong *node = |
943 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 944 | struct ust_app *app = |
852d0037 | 945 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 946 | |
852d0037 | 947 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 948 | delete_ust_app(app); |
099e26bd DG |
949 | } |
950 | ||
ffe60014 DG |
951 | /* |
952 | * Delete the session from the application ht and delete the data structure by | |
953 | * freeing every object inside and releasing them. | |
82cac6d2 JG |
954 | * |
955 | * The session list lock must be held by the caller. | |
ffe60014 | 956 | */ |
d0b96690 | 957 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
958 | struct ust_app_session *ua_sess) |
959 | { | |
960 | int ret; | |
961 | struct lttng_ht_iter iter; | |
962 | ||
963 | assert(app); | |
964 | assert(ua_sess); | |
965 | ||
966 | iter.iter.node = &ua_sess->node.node; | |
967 | ret = lttng_ht_del(app->sessions, &iter); | |
968 | if (ret) { | |
969 | /* Already scheduled for teardown. */ | |
970 | goto end; | |
971 | } | |
972 | ||
973 | /* Once deleted, free the data structure. */ | |
d0b96690 | 974 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
975 | |
976 | end: | |
977 | return; | |
978 | } | |
979 | ||
8b366481 DG |
980 | /* |
981 | * Alloc new UST app session. | |
982 | */ | |
983 | static | |
40bbd087 | 984 | struct ust_app_session *alloc_ust_app_session(void) |
8b366481 DG |
985 | { |
986 | struct ust_app_session *ua_sess; | |
987 | ||
988 | /* Init most of the default value by allocating and zeroing */ | |
989 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
990 | if (ua_sess == NULL) { | |
991 | PERROR("malloc"); | |
ffe60014 | 992 | goto error_free; |
8b366481 DG |
993 | } |
994 | ||
995 | ua_sess->handle = -1; | |
bec39940 | 996 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
ad7a9107 | 997 | ua_sess->metadata_attr.type = LTTNG_UST_CHAN_METADATA; |
84ad93e8 | 998 | pthread_mutex_init(&ua_sess->lock, NULL); |
ad7a9107 | 999 | |
8b366481 DG |
1000 | return ua_sess; |
1001 | ||
ffe60014 | 1002 | error_free: |
8b366481 DG |
1003 | return NULL; |
1004 | } | |
1005 | ||
1006 | /* | |
1007 | * Alloc new UST app channel. | |
1008 | */ | |
1009 | static | |
1010 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 1011 | struct ust_app_session *ua_sess, |
ffe60014 | 1012 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
1013 | { |
1014 | struct ust_app_channel *ua_chan; | |
1015 | ||
1016 | /* Init most of the default value by allocating and zeroing */ | |
1017 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
1018 | if (ua_chan == NULL) { | |
1019 | PERROR("malloc"); | |
1020 | goto error; | |
1021 | } | |
1022 | ||
1023 | /* Setup channel name */ | |
1024 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
1025 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
1026 | ||
1027 | ua_chan->enabled = 1; | |
1028 | ua_chan->handle = -1; | |
45893984 | 1029 | ua_chan->session = ua_sess; |
ffe60014 | 1030 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
1031 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
1032 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
1033 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
1034 | |
1035 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
31746f93 | 1036 | CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); |
8b366481 DG |
1037 | |
1038 | /* Copy attributes */ | |
1039 | if (attr) { | |
ffe60014 | 1040 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
1041 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
1042 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
1043 | ua_chan->attr.overwrite = attr->overwrite; | |
1044 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
1045 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
1046 | ua_chan->attr.output = attr->output; | |
491d1539 | 1047 | ua_chan->attr.blocking_timeout = attr->u.s.blocking_timeout; |
8b366481 | 1048 | } |
ffe60014 DG |
1049 | /* By default, the channel is a per cpu channel. */ |
1050 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
1051 | |
1052 | DBG3("UST app channel %s allocated", ua_chan->name); | |
1053 | ||
1054 | return ua_chan; | |
1055 | ||
1056 | error: | |
1057 | return NULL; | |
1058 | } | |
1059 | ||
37f1c236 DG |
1060 | /* |
1061 | * Allocate and initialize a UST app stream. | |
1062 | * | |
1063 | * Return newly allocated stream pointer or NULL on error. | |
1064 | */ | |
ffe60014 | 1065 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
1066 | { |
1067 | struct ust_app_stream *stream = NULL; | |
1068 | ||
1069 | stream = zmalloc(sizeof(*stream)); | |
1070 | if (stream == NULL) { | |
1071 | PERROR("zmalloc ust app stream"); | |
1072 | goto error; | |
1073 | } | |
1074 | ||
1075 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
1076 | stream->handle = -1; | |
1077 | ||
1078 | error: | |
1079 | return stream; | |
1080 | } | |
1081 | ||
8b366481 DG |
1082 | /* |
1083 | * Alloc new UST app event. | |
1084 | */ | |
1085 | static | |
1086 | struct ust_app_event *alloc_ust_app_event(char *name, | |
1087 | struct lttng_ust_event *attr) | |
1088 | { | |
1089 | struct ust_app_event *ua_event; | |
1090 | ||
1091 | /* Init most of the default value by allocating and zeroing */ | |
1092 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
1093 | if (ua_event == NULL) { | |
1094 | PERROR("malloc"); | |
1095 | goto error; | |
1096 | } | |
1097 | ||
1098 | ua_event->enabled = 1; | |
1099 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
1100 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 1101 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
1102 | |
1103 | /* Copy attributes */ | |
1104 | if (attr) { | |
1105 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
1106 | } | |
1107 | ||
1108 | DBG3("UST app event %s allocated", ua_event->name); | |
1109 | ||
1110 | return ua_event; | |
1111 | ||
1112 | error: | |
1113 | return NULL; | |
1114 | } | |
1115 | ||
1116 | /* | |
1117 | * Alloc new UST app context. | |
1118 | */ | |
1119 | static | |
bdf64013 | 1120 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context_attr *uctx) |
8b366481 DG |
1121 | { |
1122 | struct ust_app_ctx *ua_ctx; | |
1123 | ||
1124 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
1125 | if (ua_ctx == NULL) { | |
1126 | goto error; | |
1127 | } | |
1128 | ||
31746f93 DG |
1129 | CDS_INIT_LIST_HEAD(&ua_ctx->list); |
1130 | ||
8b366481 DG |
1131 | if (uctx) { |
1132 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
bdf64013 JG |
1133 | if (uctx->ctx == LTTNG_UST_CONTEXT_APP_CONTEXT) { |
1134 | char *provider_name = NULL, *ctx_name = NULL; | |
1135 | ||
1136 | provider_name = strdup(uctx->u.app_ctx.provider_name); | |
1137 | ctx_name = strdup(uctx->u.app_ctx.ctx_name); | |
1138 | if (!provider_name || !ctx_name) { | |
1139 | free(provider_name); | |
1140 | free(ctx_name); | |
1141 | goto error; | |
1142 | } | |
1143 | ||
1144 | ua_ctx->ctx.u.app_ctx.provider_name = provider_name; | |
1145 | ua_ctx->ctx.u.app_ctx.ctx_name = ctx_name; | |
1146 | } | |
8b366481 DG |
1147 | } |
1148 | ||
1149 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
8b366481 | 1150 | return ua_ctx; |
bdf64013 JG |
1151 | error: |
1152 | free(ua_ctx); | |
1153 | return NULL; | |
8b366481 DG |
1154 | } |
1155 | ||
025faf73 DG |
1156 | /* |
1157 | * Allocate a filter and copy the given original filter. | |
1158 | * | |
1159 | * Return allocated filter or NULL on error. | |
1160 | */ | |
51755dc8 JG |
1161 | static struct lttng_filter_bytecode *copy_filter_bytecode( |
1162 | struct lttng_filter_bytecode *orig_f) | |
025faf73 | 1163 | { |
51755dc8 | 1164 | struct lttng_filter_bytecode *filter = NULL; |
025faf73 DG |
1165 | |
1166 | /* Copy filter bytecode */ | |
1167 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
1168 | if (!filter) { | |
51755dc8 | 1169 | PERROR("zmalloc alloc filter bytecode"); |
025faf73 DG |
1170 | goto error; |
1171 | } | |
1172 | ||
1173 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
1174 | ||
1175 | error: | |
1176 | return filter; | |
1177 | } | |
1178 | ||
51755dc8 JG |
1179 | /* |
1180 | * Create a liblttng-ust filter bytecode from given bytecode. | |
1181 | * | |
1182 | * Return allocated filter or NULL on error. | |
1183 | */ | |
1184 | static struct lttng_ust_filter_bytecode *create_ust_bytecode_from_bytecode( | |
1185 | struct lttng_filter_bytecode *orig_f) | |
1186 | { | |
1187 | struct lttng_ust_filter_bytecode *filter = NULL; | |
1188 | ||
1189 | /* Copy filter bytecode */ | |
1190 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
1191 | if (!filter) { | |
1192 | PERROR("zmalloc alloc ust filter bytecode"); | |
1193 | goto error; | |
1194 | } | |
1195 | ||
1196 | assert(sizeof(struct lttng_filter_bytecode) == | |
1197 | sizeof(struct lttng_ust_filter_bytecode)); | |
1198 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
1199 | error: | |
1200 | return filter; | |
1201 | } | |
1202 | ||
099e26bd | 1203 | /* |
421cb601 DG |
1204 | * Find an ust_app using the sock and return it. RCU read side lock must be |
1205 | * held before calling this helper function. | |
099e26bd | 1206 | */ |
f20baf8e | 1207 | struct ust_app *ust_app_find_by_sock(int sock) |
099e26bd | 1208 | { |
bec39940 | 1209 | struct lttng_ht_node_ulong *node; |
bec39940 | 1210 | struct lttng_ht_iter iter; |
f6a9efaa | 1211 | |
852d0037 | 1212 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 1213 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
1214 | if (node == NULL) { |
1215 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
1216 | goto error; |
1217 | } | |
852d0037 DG |
1218 | |
1219 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
1220 | |
1221 | error: | |
1222 | return NULL; | |
099e26bd DG |
1223 | } |
1224 | ||
d0b96690 DG |
1225 | /* |
1226 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
1227 | * be held before calling this helper function. | |
1228 | */ | |
1229 | static struct ust_app *find_app_by_notify_sock(int sock) | |
1230 | { | |
1231 | struct lttng_ht_node_ulong *node; | |
1232 | struct lttng_ht_iter iter; | |
1233 | ||
1234 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
1235 | &iter); | |
1236 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1237 | if (node == NULL) { | |
1238 | DBG2("UST app find by notify sock %d not found", sock); | |
1239 | goto error; | |
1240 | } | |
1241 | ||
1242 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
1243 | ||
1244 | error: | |
1245 | return NULL; | |
1246 | } | |
1247 | ||
025faf73 DG |
1248 | /* |
1249 | * Lookup for an ust app event based on event name, filter bytecode and the | |
1250 | * event loglevel. | |
1251 | * | |
1252 | * Return an ust_app_event object or NULL on error. | |
1253 | */ | |
18eace3b | 1254 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
2106efa0 PP |
1255 | char *name, struct lttng_filter_bytecode *filter, |
1256 | int loglevel_value, | |
39c5a3a7 | 1257 | const struct lttng_event_exclusion *exclusion) |
18eace3b DG |
1258 | { |
1259 | struct lttng_ht_iter iter; | |
1260 | struct lttng_ht_node_str *node; | |
1261 | struct ust_app_event *event = NULL; | |
1262 | struct ust_app_ht_key key; | |
18eace3b DG |
1263 | |
1264 | assert(name); | |
1265 | assert(ht); | |
1266 | ||
1267 | /* Setup key for event lookup. */ | |
1268 | key.name = name; | |
1269 | key.filter = filter; | |
2106efa0 | 1270 | key.loglevel_type = loglevel_value; |
39c5a3a7 | 1271 | /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */ |
51755dc8 | 1272 | key.exclusion = exclusion; |
18eace3b | 1273 | |
025faf73 DG |
1274 | /* Lookup using the event name as hash and a custom match fct. */ |
1275 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1276 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1277 | node = lttng_ht_iter_get_node_str(&iter); |
1278 | if (node == NULL) { | |
1279 | goto end; | |
1280 | } | |
1281 | ||
1282 | event = caa_container_of(node, struct ust_app_event, node); | |
1283 | ||
1284 | end: | |
18eace3b DG |
1285 | return event; |
1286 | } | |
1287 | ||
55cc08a6 DG |
1288 | /* |
1289 | * Create the channel context on the tracer. | |
d0b96690 DG |
1290 | * |
1291 | * Called with UST app session lock held. | |
55cc08a6 DG |
1292 | */ |
1293 | static | |
1294 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1295 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1296 | { | |
1297 | int ret; | |
1298 | ||
840cb59c | 1299 | health_code_update(); |
86acf0da | 1300 | |
fb45065e | 1301 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1302 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 | 1303 | ua_chan->obj, &ua_ctx->obj); |
fb45065e | 1304 | pthread_mutex_unlock(&app->sock_lock); |
55cc08a6 | 1305 | if (ret < 0) { |
ffe60014 DG |
1306 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1307 | ERR("UST app create channel context failed for app (pid: %d) " | |
1308 | "with ret %d", app->pid, ret); | |
1309 | } else { | |
3757b385 DG |
1310 | /* |
1311 | * This is normal behavior, an application can die during the | |
1312 | * creation process. Don't report an error so the execution can | |
1313 | * continue normally. | |
1314 | */ | |
1315 | ret = 0; | |
ffe60014 DG |
1316 | DBG3("UST app disable event failed. Application is dead."); |
1317 | } | |
55cc08a6 DG |
1318 | goto error; |
1319 | } | |
1320 | ||
1321 | ua_ctx->handle = ua_ctx->obj->handle; | |
1322 | ||
d0b96690 DG |
1323 | DBG2("UST app context handle %d created successfully for channel %s", |
1324 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1325 | |
1326 | error: | |
840cb59c | 1327 | health_code_update(); |
55cc08a6 DG |
1328 | return ret; |
1329 | } | |
1330 | ||
53a80697 MD |
1331 | /* |
1332 | * Set the filter on the tracer. | |
1333 | */ | |
1334 | static | |
1335 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
1336 | struct ust_app *app) | |
1337 | { | |
1338 | int ret; | |
51755dc8 | 1339 | struct lttng_ust_filter_bytecode *ust_bytecode = NULL; |
53a80697 | 1340 | |
840cb59c | 1341 | health_code_update(); |
86acf0da | 1342 | |
53a80697 | 1343 | if (!ua_event->filter) { |
86acf0da DG |
1344 | ret = 0; |
1345 | goto error; | |
53a80697 MD |
1346 | } |
1347 | ||
51755dc8 JG |
1348 | ust_bytecode = create_ust_bytecode_from_bytecode(ua_event->filter); |
1349 | if (!ust_bytecode) { | |
1350 | ret = -LTTNG_ERR_NOMEM; | |
1351 | goto error; | |
1352 | } | |
fb45065e | 1353 | pthread_mutex_lock(&app->sock_lock); |
51755dc8 | 1354 | ret = ustctl_set_filter(app->sock, ust_bytecode, |
53a80697 | 1355 | ua_event->obj); |
fb45065e | 1356 | pthread_mutex_unlock(&app->sock_lock); |
53a80697 | 1357 | if (ret < 0) { |
ffe60014 DG |
1358 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1359 | ERR("UST app event %s filter failed for app (pid: %d) " | |
1360 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1361 | } else { | |
3757b385 DG |
1362 | /* |
1363 | * This is normal behavior, an application can die during the | |
1364 | * creation process. Don't report an error so the execution can | |
1365 | * continue normally. | |
1366 | */ | |
1367 | ret = 0; | |
ffe60014 DG |
1368 | DBG3("UST app filter event failed. Application is dead."); |
1369 | } | |
53a80697 MD |
1370 | goto error; |
1371 | } | |
1372 | ||
1373 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
1374 | ||
1375 | error: | |
840cb59c | 1376 | health_code_update(); |
51755dc8 | 1377 | free(ust_bytecode); |
53a80697 MD |
1378 | return ret; |
1379 | } | |
1380 | ||
51755dc8 JG |
1381 | static |
1382 | struct lttng_ust_event_exclusion *create_ust_exclusion_from_exclusion( | |
1383 | struct lttng_event_exclusion *exclusion) | |
1384 | { | |
1385 | struct lttng_ust_event_exclusion *ust_exclusion = NULL; | |
1386 | size_t exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) + | |
1387 | LTTNG_UST_SYM_NAME_LEN * exclusion->count; | |
1388 | ||
1389 | ust_exclusion = zmalloc(exclusion_alloc_size); | |
1390 | if (!ust_exclusion) { | |
1391 | PERROR("malloc"); | |
1392 | goto end; | |
1393 | } | |
1394 | ||
1395 | assert(sizeof(struct lttng_event_exclusion) == | |
1396 | sizeof(struct lttng_ust_event_exclusion)); | |
1397 | memcpy(ust_exclusion, exclusion, exclusion_alloc_size); | |
1398 | end: | |
1399 | return ust_exclusion; | |
1400 | } | |
1401 | ||
7cc9a73c JI |
1402 | /* |
1403 | * Set event exclusions on the tracer. | |
1404 | */ | |
1405 | static | |
1406 | int set_ust_event_exclusion(struct ust_app_event *ua_event, | |
1407 | struct ust_app *app) | |
1408 | { | |
1409 | int ret; | |
51755dc8 | 1410 | struct lttng_ust_event_exclusion *ust_exclusion = NULL; |
7cc9a73c JI |
1411 | |
1412 | health_code_update(); | |
1413 | ||
1414 | if (!ua_event->exclusion || !ua_event->exclusion->count) { | |
1415 | ret = 0; | |
1416 | goto error; | |
1417 | } | |
1418 | ||
51755dc8 JG |
1419 | ust_exclusion = create_ust_exclusion_from_exclusion( |
1420 | ua_event->exclusion); | |
1421 | if (!ust_exclusion) { | |
1422 | ret = -LTTNG_ERR_NOMEM; | |
1423 | goto error; | |
1424 | } | |
fb45065e | 1425 | pthread_mutex_lock(&app->sock_lock); |
51755dc8 | 1426 | ret = ustctl_set_exclusion(app->sock, ust_exclusion, ua_event->obj); |
fb45065e | 1427 | pthread_mutex_unlock(&app->sock_lock); |
7cc9a73c JI |
1428 | if (ret < 0) { |
1429 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1430 | ERR("UST app event %s exclusions failed for app (pid: %d) " | |
1431 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1432 | } else { | |
1433 | /* | |
1434 | * This is normal behavior, an application can die during the | |
1435 | * creation process. Don't report an error so the execution can | |
1436 | * continue normally. | |
1437 | */ | |
1438 | ret = 0; | |
1439 | DBG3("UST app event exclusion failed. Application is dead."); | |
1440 | } | |
1441 | goto error; | |
1442 | } | |
1443 | ||
1444 | DBG2("UST exclusion set successfully for event %s", ua_event->name); | |
1445 | ||
1446 | error: | |
1447 | health_code_update(); | |
51755dc8 | 1448 | free(ust_exclusion); |
7cc9a73c JI |
1449 | return ret; |
1450 | } | |
1451 | ||
9730260e DG |
1452 | /* |
1453 | * Disable the specified event on to UST tracer for the UST session. | |
1454 | */ | |
1455 | static int disable_ust_event(struct ust_app *app, | |
1456 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1457 | { | |
1458 | int ret; | |
1459 | ||
840cb59c | 1460 | health_code_update(); |
86acf0da | 1461 | |
fb45065e | 1462 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1463 | ret = ustctl_disable(app->sock, ua_event->obj); |
fb45065e | 1464 | pthread_mutex_unlock(&app->sock_lock); |
9730260e | 1465 | if (ret < 0) { |
ffe60014 DG |
1466 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1467 | ERR("UST app event %s disable failed for app (pid: %d) " | |
1468 | "and session handle %d with ret %d", | |
1469 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1470 | } else { | |
3757b385 DG |
1471 | /* |
1472 | * This is normal behavior, an application can die during the | |
1473 | * creation process. Don't report an error so the execution can | |
1474 | * continue normally. | |
1475 | */ | |
1476 | ret = 0; | |
ffe60014 DG |
1477 | DBG3("UST app disable event failed. Application is dead."); |
1478 | } | |
9730260e DG |
1479 | goto error; |
1480 | } | |
1481 | ||
1482 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 1483 | ua_event->attr.name, app->pid); |
9730260e DG |
1484 | |
1485 | error: | |
840cb59c | 1486 | health_code_update(); |
9730260e DG |
1487 | return ret; |
1488 | } | |
1489 | ||
78f0bacd DG |
1490 | /* |
1491 | * Disable the specified channel on to UST tracer for the UST session. | |
1492 | */ | |
1493 | static int disable_ust_channel(struct ust_app *app, | |
1494 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1495 | { | |
1496 | int ret; | |
1497 | ||
840cb59c | 1498 | health_code_update(); |
86acf0da | 1499 | |
fb45065e | 1500 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1501 | ret = ustctl_disable(app->sock, ua_chan->obj); |
fb45065e | 1502 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1503 | if (ret < 0) { |
ffe60014 DG |
1504 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1505 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1506 | "and session handle %d with ret %d", | |
1507 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1508 | } else { | |
3757b385 DG |
1509 | /* |
1510 | * This is normal behavior, an application can die during the | |
1511 | * creation process. Don't report an error so the execution can | |
1512 | * continue normally. | |
1513 | */ | |
1514 | ret = 0; | |
ffe60014 DG |
1515 | DBG3("UST app disable channel failed. Application is dead."); |
1516 | } | |
78f0bacd DG |
1517 | goto error; |
1518 | } | |
1519 | ||
78f0bacd | 1520 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1521 | ua_chan->name, app->pid); |
78f0bacd DG |
1522 | |
1523 | error: | |
840cb59c | 1524 | health_code_update(); |
78f0bacd DG |
1525 | return ret; |
1526 | } | |
1527 | ||
1528 | /* | |
1529 | * Enable the specified channel on to UST tracer for the UST session. | |
1530 | */ | |
1531 | static int enable_ust_channel(struct ust_app *app, | |
1532 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1533 | { | |
1534 | int ret; | |
1535 | ||
840cb59c | 1536 | health_code_update(); |
86acf0da | 1537 | |
fb45065e | 1538 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1539 | ret = ustctl_enable(app->sock, ua_chan->obj); |
fb45065e | 1540 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1541 | if (ret < 0) { |
ffe60014 DG |
1542 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1543 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1544 | "and session handle %d with ret %d", | |
1545 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1546 | } else { | |
3757b385 DG |
1547 | /* |
1548 | * This is normal behavior, an application can die during the | |
1549 | * creation process. Don't report an error so the execution can | |
1550 | * continue normally. | |
1551 | */ | |
1552 | ret = 0; | |
ffe60014 DG |
1553 | DBG3("UST app enable channel failed. Application is dead."); |
1554 | } | |
78f0bacd DG |
1555 | goto error; |
1556 | } | |
1557 | ||
1558 | ua_chan->enabled = 1; | |
1559 | ||
1560 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1561 | ua_chan->name, app->pid); |
78f0bacd DG |
1562 | |
1563 | error: | |
840cb59c | 1564 | health_code_update(); |
78f0bacd DG |
1565 | return ret; |
1566 | } | |
1567 | ||
edb67388 DG |
1568 | /* |
1569 | * Enable the specified event on to UST tracer for the UST session. | |
1570 | */ | |
1571 | static int enable_ust_event(struct ust_app *app, | |
1572 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1573 | { | |
1574 | int ret; | |
1575 | ||
840cb59c | 1576 | health_code_update(); |
86acf0da | 1577 | |
fb45065e | 1578 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1579 | ret = ustctl_enable(app->sock, ua_event->obj); |
fb45065e | 1580 | pthread_mutex_unlock(&app->sock_lock); |
edb67388 | 1581 | if (ret < 0) { |
ffe60014 DG |
1582 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1583 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1584 | "and session handle %d with ret %d", | |
1585 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1586 | } else { | |
3757b385 DG |
1587 | /* |
1588 | * This is normal behavior, an application can die during the | |
1589 | * creation process. Don't report an error so the execution can | |
1590 | * continue normally. | |
1591 | */ | |
1592 | ret = 0; | |
ffe60014 DG |
1593 | DBG3("UST app enable event failed. Application is dead."); |
1594 | } | |
edb67388 DG |
1595 | goto error; |
1596 | } | |
1597 | ||
1598 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1599 | ua_event->attr.name, app->pid); |
edb67388 DG |
1600 | |
1601 | error: | |
840cb59c | 1602 | health_code_update(); |
edb67388 DG |
1603 | return ret; |
1604 | } | |
1605 | ||
099e26bd | 1606 | /* |
7972aab2 | 1607 | * Send channel and stream buffer to application. |
4f3ab6ee | 1608 | * |
ffe60014 | 1609 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1610 | */ |
7972aab2 DG |
1611 | static int send_channel_pid_to_ust(struct ust_app *app, |
1612 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1613 | { |
1614 | int ret; | |
ffe60014 | 1615 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1616 | |
1617 | assert(app); | |
ffe60014 | 1618 | assert(ua_sess); |
4f3ab6ee | 1619 | assert(ua_chan); |
4f3ab6ee | 1620 | |
840cb59c | 1621 | health_code_update(); |
4f3ab6ee | 1622 | |
7972aab2 DG |
1623 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1624 | app->sock); | |
86acf0da | 1625 | |
ffe60014 DG |
1626 | /* Send channel to the application. */ |
1627 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
1628 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1629 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1630 | goto error; | |
1631 | } else if (ret < 0) { | |
b551a063 DG |
1632 | goto error; |
1633 | } | |
1634 | ||
d88aee68 DG |
1635 | health_code_update(); |
1636 | ||
ffe60014 DG |
1637 | /* Send all streams to application. */ |
1638 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1639 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
a7169585 MD |
1640 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1641 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1642 | goto error; | |
1643 | } else if (ret < 0) { | |
ffe60014 DG |
1644 | goto error; |
1645 | } | |
1646 | /* We don't need the stream anymore once sent to the tracer. */ | |
1647 | cds_list_del(&stream->list); | |
fb45065e | 1648 | delete_ust_app_stream(-1, stream, app); |
ffe60014 | 1649 | } |
ffe60014 DG |
1650 | /* Flag the channel that it is sent to the application. */ |
1651 | ua_chan->is_sent = 1; | |
ffe60014 | 1652 | |
b551a063 | 1653 | error: |
840cb59c | 1654 | health_code_update(); |
b551a063 DG |
1655 | return ret; |
1656 | } | |
1657 | ||
91d76f53 | 1658 | /* |
5b4a0ec0 | 1659 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1660 | * |
1661 | * Should be called with session mutex held. | |
91d76f53 | 1662 | */ |
edb67388 DG |
1663 | static |
1664 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1665 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1666 | { |
5b4a0ec0 | 1667 | int ret = 0; |
284d8f55 | 1668 | |
840cb59c | 1669 | health_code_update(); |
86acf0da | 1670 | |
5b4a0ec0 | 1671 | /* Create UST event on tracer */ |
fb45065e | 1672 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1673 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 | 1674 | &ua_event->obj); |
fb45065e | 1675 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 | 1676 | if (ret < 0) { |
ffe60014 DG |
1677 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1678 | ERR("Error ustctl create event %s for app pid: %d with ret %d", | |
1679 | ua_event->attr.name, app->pid, ret); | |
1680 | } else { | |
3757b385 DG |
1681 | /* |
1682 | * This is normal behavior, an application can die during the | |
1683 | * creation process. Don't report an error so the execution can | |
1684 | * continue normally. | |
1685 | */ | |
1686 | ret = 0; | |
ffe60014 DG |
1687 | DBG3("UST app create event failed. Application is dead."); |
1688 | } | |
5b4a0ec0 | 1689 | goto error; |
91d76f53 | 1690 | } |
f6a9efaa | 1691 | |
5b4a0ec0 | 1692 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1693 | |
5b4a0ec0 | 1694 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1695 | ua_event->attr.name, app->pid); |
f6a9efaa | 1696 | |
840cb59c | 1697 | health_code_update(); |
86acf0da | 1698 | |
025faf73 DG |
1699 | /* Set filter if one is present. */ |
1700 | if (ua_event->filter) { | |
1701 | ret = set_ust_event_filter(ua_event, app); | |
1702 | if (ret < 0) { | |
1703 | goto error; | |
1704 | } | |
1705 | } | |
1706 | ||
7cc9a73c JI |
1707 | /* Set exclusions for the event */ |
1708 | if (ua_event->exclusion) { | |
1709 | ret = set_ust_event_exclusion(ua_event, app); | |
1710 | if (ret < 0) { | |
1711 | goto error; | |
1712 | } | |
1713 | } | |
1714 | ||
8535a6d9 | 1715 | /* If event not enabled, disable it on the tracer */ |
40113787 MD |
1716 | if (ua_event->enabled) { |
1717 | /* | |
1718 | * We now need to explicitly enable the event, since it | |
1719 | * is now disabled at creation. | |
1720 | */ | |
1721 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1722 | if (ret < 0) { | |
1723 | /* | |
1724 | * If we hit an EPERM, something is wrong with our enable call. If | |
1725 | * we get an EEXIST, there is a problem on the tracer side since we | |
1726 | * just created it. | |
1727 | */ | |
1728 | switch (ret) { | |
1729 | case -LTTNG_UST_ERR_PERM: | |
1730 | /* Code flow problem */ | |
1731 | assert(0); | |
1732 | case -LTTNG_UST_ERR_EXIST: | |
1733 | /* It's OK for our use case. */ | |
1734 | ret = 0; | |
1735 | break; | |
1736 | default: | |
1737 | break; | |
1738 | } | |
1739 | goto error; | |
1740 | } | |
8535a6d9 DG |
1741 | } |
1742 | ||
5b4a0ec0 | 1743 | error: |
840cb59c | 1744 | health_code_update(); |
5b4a0ec0 | 1745 | return ret; |
91d76f53 | 1746 | } |
48842b30 | 1747 | |
5b4a0ec0 DG |
1748 | /* |
1749 | * Copy data between an UST app event and a LTT event. | |
1750 | */ | |
421cb601 | 1751 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1752 | struct ltt_ust_event *uevent) |
1753 | { | |
b4ffad32 JI |
1754 | size_t exclusion_alloc_size; |
1755 | ||
48842b30 DG |
1756 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); |
1757 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1758 | ||
fc34caaa DG |
1759 | ua_event->enabled = uevent->enabled; |
1760 | ||
5b4a0ec0 DG |
1761 | /* Copy event attributes */ |
1762 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1763 | ||
53a80697 MD |
1764 | /* Copy filter bytecode */ |
1765 | if (uevent->filter) { | |
51755dc8 | 1766 | ua_event->filter = copy_filter_bytecode(uevent->filter); |
025faf73 | 1767 | /* Filter might be NULL here in case of ENONEM. */ |
53a80697 | 1768 | } |
b4ffad32 JI |
1769 | |
1770 | /* Copy exclusion data */ | |
1771 | if (uevent->exclusion) { | |
51755dc8 | 1772 | exclusion_alloc_size = sizeof(struct lttng_event_exclusion) + |
b4ffad32 JI |
1773 | LTTNG_UST_SYM_NAME_LEN * uevent->exclusion->count; |
1774 | ua_event->exclusion = zmalloc(exclusion_alloc_size); | |
5f8df26c JI |
1775 | if (ua_event->exclusion == NULL) { |
1776 | PERROR("malloc"); | |
1777 | } else { | |
1778 | memcpy(ua_event->exclusion, uevent->exclusion, | |
1779 | exclusion_alloc_size); | |
b4ffad32 JI |
1780 | } |
1781 | } | |
48842b30 DG |
1782 | } |
1783 | ||
5b4a0ec0 DG |
1784 | /* |
1785 | * Copy data between an UST app channel and a LTT channel. | |
1786 | */ | |
421cb601 | 1787 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1788 | struct ltt_ust_channel *uchan) |
1789 | { | |
bec39940 | 1790 | struct lttng_ht_iter iter; |
48842b30 | 1791 | struct ltt_ust_event *uevent; |
55cc08a6 | 1792 | struct ltt_ust_context *uctx; |
48842b30 DG |
1793 | struct ust_app_event *ua_event; |
1794 | ||
fc34caaa | 1795 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1796 | |
1797 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1798 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 1799 | |
1624d5b7 JD |
1800 | ua_chan->tracefile_size = uchan->tracefile_size; |
1801 | ua_chan->tracefile_count = uchan->tracefile_count; | |
1802 | ||
ffe60014 DG |
1803 | /* Copy event attributes since the layout is different. */ |
1804 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1805 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1806 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1807 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1808 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
e9404c27 | 1809 | ua_chan->monitor_timer_interval = uchan->monitor_timer_interval; |
ffe60014 | 1810 | ua_chan->attr.output = uchan->attr.output; |
491d1539 MD |
1811 | ua_chan->attr.blocking_timeout = uchan->attr.u.s.blocking_timeout; |
1812 | ||
ffe60014 DG |
1813 | /* |
1814 | * Note that the attribute channel type is not set since the channel on the | |
1815 | * tracing registry side does not have this information. | |
1816 | */ | |
48842b30 | 1817 | |
fc34caaa | 1818 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1819 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1820 | |
31746f93 | 1821 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { |
bdf64013 JG |
1822 | struct ust_app_ctx *ua_ctx = alloc_ust_app_ctx(&uctx->ctx); |
1823 | ||
55cc08a6 DG |
1824 | if (ua_ctx == NULL) { |
1825 | continue; | |
1826 | } | |
bec39940 DG |
1827 | lttng_ht_node_init_ulong(&ua_ctx->node, |
1828 | (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 1829 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 1830 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
55cc08a6 | 1831 | } |
48842b30 | 1832 | |
421cb601 | 1833 | /* Copy all events from ltt ust channel to ust app channel */ |
bec39940 | 1834 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
18eace3b | 1835 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 1836 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 1837 | if (ua_event == NULL) { |
421cb601 | 1838 | DBG2("UST event %s not found on shadow copy channel", |
48842b30 | 1839 | uevent->attr.name); |
284d8f55 | 1840 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
48842b30 | 1841 | if (ua_event == NULL) { |
5b4a0ec0 | 1842 | continue; |
48842b30 | 1843 | } |
421cb601 | 1844 | shadow_copy_event(ua_event, uevent); |
d0b96690 | 1845 | add_unique_ust_app_event(ua_chan, ua_event); |
48842b30 | 1846 | } |
48842b30 DG |
1847 | } |
1848 | ||
fc34caaa | 1849 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1850 | } |
1851 | ||
5b4a0ec0 DG |
1852 | /* |
1853 | * Copy data between a UST app session and a regular LTT session. | |
1854 | */ | |
421cb601 | 1855 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1856 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1857 | { |
bec39940 DG |
1858 | struct lttng_ht_node_str *ua_chan_node; |
1859 | struct lttng_ht_iter iter; | |
48842b30 DG |
1860 | struct ltt_ust_channel *uchan; |
1861 | struct ust_app_channel *ua_chan; | |
477d7741 MD |
1862 | time_t rawtime; |
1863 | struct tm *timeinfo; | |
1864 | char datetime[16]; | |
1865 | int ret; | |
d7ba1388 | 1866 | char tmp_shm_path[PATH_MAX]; |
477d7741 MD |
1867 | |
1868 | /* Get date and time for unique app path */ | |
1869 | time(&rawtime); | |
1870 | timeinfo = localtime(&rawtime); | |
1871 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1872 | |
421cb601 | 1873 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1874 | |
7972aab2 DG |
1875 | ua_sess->tracing_id = usess->id; |
1876 | ua_sess->id = get_next_session_id(); | |
1877 | ua_sess->uid = app->uid; | |
1878 | ua_sess->gid = app->gid; | |
1879 | ua_sess->euid = usess->uid; | |
1880 | ua_sess->egid = usess->gid; | |
1881 | ua_sess->buffer_type = usess->buffer_type; | |
1882 | ua_sess->bits_per_long = app->bits_per_long; | |
6addfa37 | 1883 | |
7972aab2 | 1884 | /* There is only one consumer object per session possible. */ |
6addfa37 | 1885 | consumer_output_get(usess->consumer); |
7972aab2 | 1886 | ua_sess->consumer = usess->consumer; |
6addfa37 | 1887 | |
2bba9e53 | 1888 | ua_sess->output_traces = usess->output_traces; |
ecc48a90 | 1889 | ua_sess->live_timer_interval = usess->live_timer_interval; |
84ad93e8 DG |
1890 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, |
1891 | &usess->metadata_attr); | |
7972aab2 DG |
1892 | |
1893 | switch (ua_sess->buffer_type) { | |
1894 | case LTTNG_BUFFER_PER_PID: | |
1895 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 1896 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
1897 | datetime); |
1898 | break; | |
1899 | case LTTNG_BUFFER_PER_UID: | |
1900 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1901 | DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long); | |
1902 | break; | |
1903 | default: | |
1904 | assert(0); | |
1905 | goto error; | |
1906 | } | |
477d7741 MD |
1907 | if (ret < 0) { |
1908 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1909 | assert(0); |
7972aab2 | 1910 | goto error; |
477d7741 MD |
1911 | } |
1912 | ||
3d071855 MD |
1913 | strncpy(ua_sess->root_shm_path, usess->root_shm_path, |
1914 | sizeof(ua_sess->root_shm_path)); | |
1915 | ua_sess->root_shm_path[sizeof(ua_sess->root_shm_path) - 1] = '\0'; | |
d7ba1388 MD |
1916 | strncpy(ua_sess->shm_path, usess->shm_path, |
1917 | sizeof(ua_sess->shm_path)); | |
1918 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
1919 | if (ua_sess->shm_path[0]) { | |
1920 | switch (ua_sess->buffer_type) { | |
1921 | case LTTNG_BUFFER_PER_PID: | |
1922 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
1923 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", | |
1924 | app->name, app->pid, datetime); | |
1925 | break; | |
1926 | case LTTNG_BUFFER_PER_UID: | |
1927 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
1928 | DEFAULT_UST_TRACE_UID_PATH, | |
1929 | app->uid, app->bits_per_long); | |
1930 | break; | |
1931 | default: | |
1932 | assert(0); | |
1933 | goto error; | |
1934 | } | |
1935 | if (ret < 0) { | |
1936 | PERROR("sprintf UST shadow copy session"); | |
1937 | assert(0); | |
1938 | goto error; | |
1939 | } | |
1940 | strncat(ua_sess->shm_path, tmp_shm_path, | |
1941 | sizeof(ua_sess->shm_path) - strlen(ua_sess->shm_path) - 1); | |
1942 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
1943 | } | |
1944 | ||
48842b30 | 1945 | /* Iterate over all channels in global domain. */ |
bec39940 DG |
1946 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, |
1947 | uchan, node.node) { | |
1948 | struct lttng_ht_iter uiter; | |
ba767faf | 1949 | |
bec39940 DG |
1950 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
1951 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
5b4a0ec0 | 1952 | if (ua_chan_node != NULL) { |
fc34caaa | 1953 | /* Session exist. Contiuing. */ |
5b4a0ec0 DG |
1954 | continue; |
1955 | } | |
421cb601 | 1956 | |
5b4a0ec0 DG |
1957 | DBG2("Channel %s not found on shadow session copy, creating it", |
1958 | uchan->name); | |
fb83fe64 JD |
1959 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, |
1960 | &uchan->attr); | |
5b4a0ec0 | 1961 | if (ua_chan == NULL) { |
fc34caaa | 1962 | /* malloc failed FIXME: Might want to do handle ENOMEM .. */ |
5b4a0ec0 | 1963 | continue; |
48842b30 | 1964 | } |
5b4a0ec0 | 1965 | shadow_copy_channel(ua_chan, uchan); |
ffe60014 DG |
1966 | /* |
1967 | * The concept of metadata channel does not exist on the tracing | |
1968 | * registry side of the session daemon so this can only be a per CPU | |
1969 | * channel and not metadata. | |
1970 | */ | |
1971 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
1972 | ||
bec39940 | 1973 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); |
48842b30 | 1974 | } |
6addfa37 | 1975 | return; |
7972aab2 DG |
1976 | |
1977 | error: | |
6addfa37 | 1978 | consumer_output_put(ua_sess->consumer); |
48842b30 DG |
1979 | } |
1980 | ||
78f0bacd DG |
1981 | /* |
1982 | * Lookup sesison wrapper. | |
1983 | */ | |
84cd17c6 MD |
1984 | static |
1985 | void __lookup_session_by_app(struct ltt_ust_session *usess, | |
bec39940 | 1986 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1987 | { |
1988 | /* Get right UST app session from app */ | |
d9bf3ca4 | 1989 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
1990 | } |
1991 | ||
421cb601 DG |
1992 | /* |
1993 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1994 | * id. |
421cb601 | 1995 | */ |
48842b30 DG |
1996 | static struct ust_app_session *lookup_session_by_app( |
1997 | struct ltt_ust_session *usess, struct ust_app *app) | |
1998 | { | |
bec39940 | 1999 | struct lttng_ht_iter iter; |
d9bf3ca4 | 2000 | struct lttng_ht_node_u64 *node; |
48842b30 | 2001 | |
84cd17c6 | 2002 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 2003 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
2004 | if (node == NULL) { |
2005 | goto error; | |
2006 | } | |
2007 | ||
2008 | return caa_container_of(node, struct ust_app_session, node); | |
2009 | ||
2010 | error: | |
2011 | return NULL; | |
2012 | } | |
2013 | ||
7972aab2 DG |
2014 | /* |
2015 | * Setup buffer registry per PID for the given session and application. If none | |
2016 | * is found, a new one is created, added to the global registry and | |
2017 | * initialized. If regp is valid, it's set with the newly created object. | |
2018 | * | |
2019 | * Return 0 on success or else a negative value. | |
2020 | */ | |
2021 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
2022 | struct ust_app *app, struct buffer_reg_pid **regp) | |
2023 | { | |
2024 | int ret = 0; | |
2025 | struct buffer_reg_pid *reg_pid; | |
2026 | ||
2027 | assert(ua_sess); | |
2028 | assert(app); | |
2029 | ||
2030 | rcu_read_lock(); | |
2031 | ||
2032 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
2033 | if (!reg_pid) { | |
2034 | /* | |
2035 | * This is the create channel path meaning that if there is NO | |
2036 | * registry available, we have to create one for this session. | |
2037 | */ | |
d7ba1388 | 2038 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid, |
3d071855 | 2039 | ua_sess->root_shm_path, ua_sess->shm_path); |
7972aab2 DG |
2040 | if (ret < 0) { |
2041 | goto error; | |
2042 | } | |
7972aab2 DG |
2043 | } else { |
2044 | goto end; | |
2045 | } | |
2046 | ||
2047 | /* Initialize registry. */ | |
2048 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
2049 | app->bits_per_long, app->uint8_t_alignment, | |
2050 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
2051 | app->uint64_t_alignment, app->long_alignment, |
2052 | app->byte_order, app->version.major, | |
3d071855 MD |
2053 | app->version.minor, reg_pid->root_shm_path, |
2054 | reg_pid->shm_path, | |
d7ba1388 | 2055 | ua_sess->euid, ua_sess->egid); |
7972aab2 | 2056 | if (ret < 0) { |
286c991a MD |
2057 | /* |
2058 | * reg_pid->registry->reg.ust is NULL upon error, so we need to | |
2059 | * destroy the buffer registry, because it is always expected | |
2060 | * that if the buffer registry can be found, its ust registry is | |
2061 | * non-NULL. | |
2062 | */ | |
2063 | buffer_reg_pid_destroy(reg_pid); | |
7972aab2 DG |
2064 | goto error; |
2065 | } | |
2066 | ||
286c991a MD |
2067 | buffer_reg_pid_add(reg_pid); |
2068 | ||
7972aab2 DG |
2069 | DBG3("UST app buffer registry per PID created successfully"); |
2070 | ||
2071 | end: | |
2072 | if (regp) { | |
2073 | *regp = reg_pid; | |
2074 | } | |
2075 | error: | |
2076 | rcu_read_unlock(); | |
2077 | return ret; | |
2078 | } | |
2079 | ||
2080 | /* | |
2081 | * Setup buffer registry per UID for the given session and application. If none | |
2082 | * is found, a new one is created, added to the global registry and | |
2083 | * initialized. If regp is valid, it's set with the newly created object. | |
2084 | * | |
2085 | * Return 0 on success or else a negative value. | |
2086 | */ | |
2087 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
d7ba1388 | 2088 | struct ust_app_session *ua_sess, |
7972aab2 DG |
2089 | struct ust_app *app, struct buffer_reg_uid **regp) |
2090 | { | |
2091 | int ret = 0; | |
2092 | struct buffer_reg_uid *reg_uid; | |
2093 | ||
2094 | assert(usess); | |
2095 | assert(app); | |
2096 | ||
2097 | rcu_read_lock(); | |
2098 | ||
2099 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2100 | if (!reg_uid) { | |
2101 | /* | |
2102 | * This is the create channel path meaning that if there is NO | |
2103 | * registry available, we have to create one for this session. | |
2104 | */ | |
2105 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
3d071855 MD |
2106 | LTTNG_DOMAIN_UST, ®_uid, |
2107 | ua_sess->root_shm_path, ua_sess->shm_path); | |
7972aab2 DG |
2108 | if (ret < 0) { |
2109 | goto error; | |
2110 | } | |
7972aab2 DG |
2111 | } else { |
2112 | goto end; | |
2113 | } | |
2114 | ||
2115 | /* Initialize registry. */ | |
af6142cf | 2116 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
2117 | app->bits_per_long, app->uint8_t_alignment, |
2118 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
2119 | app->uint64_t_alignment, app->long_alignment, |
2120 | app->byte_order, app->version.major, | |
3d071855 MD |
2121 | app->version.minor, reg_uid->root_shm_path, |
2122 | reg_uid->shm_path, usess->uid, usess->gid); | |
7972aab2 | 2123 | if (ret < 0) { |
286c991a MD |
2124 | /* |
2125 | * reg_uid->registry->reg.ust is NULL upon error, so we need to | |
2126 | * destroy the buffer registry, because it is always expected | |
2127 | * that if the buffer registry can be found, its ust registry is | |
2128 | * non-NULL. | |
2129 | */ | |
2130 | buffer_reg_uid_destroy(reg_uid, NULL); | |
7972aab2 DG |
2131 | goto error; |
2132 | } | |
2133 | /* Add node to teardown list of the session. */ | |
2134 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
2135 | ||
286c991a | 2136 | buffer_reg_uid_add(reg_uid); |
7972aab2 | 2137 | |
286c991a | 2138 | DBG3("UST app buffer registry per UID created successfully"); |
7972aab2 DG |
2139 | end: |
2140 | if (regp) { | |
2141 | *regp = reg_uid; | |
2142 | } | |
2143 | error: | |
2144 | rcu_read_unlock(); | |
2145 | return ret; | |
2146 | } | |
2147 | ||
421cb601 | 2148 | /* |
3d8ca23b | 2149 | * Create a session on the tracer side for the given app. |
421cb601 | 2150 | * |
3d8ca23b DG |
2151 | * On success, ua_sess_ptr is populated with the session pointer or else left |
2152 | * untouched. If the session was created, is_created is set to 1. On error, | |
2153 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
2154 | * be NULL. | |
2155 | * | |
2156 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
2157 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 2158 | */ |
03f91eaa | 2159 | static int find_or_create_ust_app_session(struct ltt_ust_session *usess, |
3d8ca23b DG |
2160 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, |
2161 | int *is_created) | |
421cb601 | 2162 | { |
3d8ca23b | 2163 | int ret, created = 0; |
421cb601 DG |
2164 | struct ust_app_session *ua_sess; |
2165 | ||
3d8ca23b DG |
2166 | assert(usess); |
2167 | assert(app); | |
2168 | assert(ua_sess_ptr); | |
2169 | ||
840cb59c | 2170 | health_code_update(); |
86acf0da | 2171 | |
421cb601 DG |
2172 | ua_sess = lookup_session_by_app(usess, app); |
2173 | if (ua_sess == NULL) { | |
d9bf3ca4 | 2174 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 2175 | app->pid, usess->id); |
40bbd087 | 2176 | ua_sess = alloc_ust_app_session(); |
421cb601 DG |
2177 | if (ua_sess == NULL) { |
2178 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
2179 | ret = -ENOMEM; |
2180 | goto error; | |
421cb601 | 2181 | } |
477d7741 | 2182 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 2183 | created = 1; |
421cb601 DG |
2184 | } |
2185 | ||
7972aab2 DG |
2186 | switch (usess->buffer_type) { |
2187 | case LTTNG_BUFFER_PER_PID: | |
2188 | /* Init local registry. */ | |
2189 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 2190 | if (ret < 0) { |
e64207cf | 2191 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2192 | goto error; |
2193 | } | |
2194 | break; | |
2195 | case LTTNG_BUFFER_PER_UID: | |
2196 | /* Look for a global registry. If none exists, create one. */ | |
d7ba1388 | 2197 | ret = setup_buffer_reg_uid(usess, ua_sess, app, NULL); |
7972aab2 | 2198 | if (ret < 0) { |
e64207cf | 2199 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2200 | goto error; |
2201 | } | |
2202 | break; | |
2203 | default: | |
2204 | assert(0); | |
2205 | ret = -EINVAL; | |
2206 | goto error; | |
2207 | } | |
2208 | ||
2209 | health_code_update(); | |
2210 | ||
2211 | if (ua_sess->handle == -1) { | |
fb45065e | 2212 | pthread_mutex_lock(&app->sock_lock); |
7972aab2 | 2213 | ret = ustctl_create_session(app->sock); |
fb45065e | 2214 | pthread_mutex_unlock(&app->sock_lock); |
7972aab2 DG |
2215 | if (ret < 0) { |
2216 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
2217 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
2218 | app->pid, ret); |
2219 | } else { | |
2220 | DBG("UST app creating session failed. Application is dead"); | |
3757b385 DG |
2221 | /* |
2222 | * This is normal behavior, an application can die during the | |
2223 | * creation process. Don't report an error so the execution can | |
2224 | * continue normally. This will get flagged ENOTCONN and the | |
2225 | * caller will handle it. | |
2226 | */ | |
2227 | ret = 0; | |
ffe60014 | 2228 | } |
d0b96690 | 2229 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
2230 | if (ret != -ENOMEM) { |
2231 | /* | |
2232 | * Tracer is probably gone or got an internal error so let's | |
2233 | * behave like it will soon unregister or not usable. | |
2234 | */ | |
2235 | ret = -ENOTCONN; | |
2236 | } | |
2237 | goto error; | |
421cb601 DG |
2238 | } |
2239 | ||
7972aab2 DG |
2240 | ua_sess->handle = ret; |
2241 | ||
2242 | /* Add ust app session to app's HT */ | |
d9bf3ca4 MD |
2243 | lttng_ht_node_init_u64(&ua_sess->node, |
2244 | ua_sess->tracing_id); | |
2245 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
10b56aef MD |
2246 | lttng_ht_node_init_ulong(&ua_sess->ust_objd_node, ua_sess->handle); |
2247 | lttng_ht_add_unique_ulong(app->ust_sessions_objd, | |
2248 | &ua_sess->ust_objd_node); | |
7972aab2 DG |
2249 | |
2250 | DBG2("UST app session created successfully with handle %d", ret); | |
2251 | } | |
2252 | ||
2253 | *ua_sess_ptr = ua_sess; | |
2254 | if (is_created) { | |
2255 | *is_created = created; | |
2256 | } | |
2257 | ||
2258 | /* Everything went well. */ | |
2259 | ret = 0; | |
2260 | ||
2261 | error: | |
2262 | health_code_update(); | |
2263 | return ret; | |
2264 | } | |
2265 | ||
6a6b2068 JG |
2266 | /* |
2267 | * Match function for a hash table lookup of ust_app_ctx. | |
2268 | * | |
2269 | * It matches an ust app context based on the context type and, in the case | |
2270 | * of perf counters, their name. | |
2271 | */ | |
2272 | static int ht_match_ust_app_ctx(struct cds_lfht_node *node, const void *_key) | |
2273 | { | |
2274 | struct ust_app_ctx *ctx; | |
bdf64013 | 2275 | const struct lttng_ust_context_attr *key; |
6a6b2068 JG |
2276 | |
2277 | assert(node); | |
2278 | assert(_key); | |
2279 | ||
2280 | ctx = caa_container_of(node, struct ust_app_ctx, node.node); | |
2281 | key = _key; | |
2282 | ||
2283 | /* Context type */ | |
2284 | if (ctx->ctx.ctx != key->ctx) { | |
2285 | goto no_match; | |
2286 | } | |
2287 | ||
bdf64013 JG |
2288 | switch(key->ctx) { |
2289 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: | |
6a6b2068 | 2290 | if (strncmp(key->u.perf_counter.name, |
bdf64013 JG |
2291 | ctx->ctx.u.perf_counter.name, |
2292 | sizeof(key->u.perf_counter.name))) { | |
2293 | goto no_match; | |
2294 | } | |
2295 | break; | |
2296 | case LTTNG_UST_CONTEXT_APP_CONTEXT: | |
2297 | if (strcmp(key->u.app_ctx.provider_name, | |
2298 | ctx->ctx.u.app_ctx.provider_name) || | |
2299 | strcmp(key->u.app_ctx.ctx_name, | |
2300 | ctx->ctx.u.app_ctx.ctx_name)) { | |
6a6b2068 JG |
2301 | goto no_match; |
2302 | } | |
bdf64013 JG |
2303 | break; |
2304 | default: | |
2305 | break; | |
6a6b2068 JG |
2306 | } |
2307 | ||
2308 | /* Match. */ | |
2309 | return 1; | |
2310 | ||
2311 | no_match: | |
2312 | return 0; | |
2313 | } | |
2314 | ||
2315 | /* | |
2316 | * Lookup for an ust app context from an lttng_ust_context. | |
2317 | * | |
be184a0f | 2318 | * Must be called while holding RCU read side lock. |
6a6b2068 JG |
2319 | * Return an ust_app_ctx object or NULL on error. |
2320 | */ | |
2321 | static | |
2322 | struct ust_app_ctx *find_ust_app_context(struct lttng_ht *ht, | |
bdf64013 | 2323 | struct lttng_ust_context_attr *uctx) |
6a6b2068 JG |
2324 | { |
2325 | struct lttng_ht_iter iter; | |
2326 | struct lttng_ht_node_ulong *node; | |
2327 | struct ust_app_ctx *app_ctx = NULL; | |
2328 | ||
2329 | assert(uctx); | |
2330 | assert(ht); | |
2331 | ||
2332 | /* Lookup using the lttng_ust_context_type and a custom match fct. */ | |
2333 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) uctx->ctx, lttng_ht_seed), | |
2334 | ht_match_ust_app_ctx, uctx, &iter.iter); | |
2335 | node = lttng_ht_iter_get_node_ulong(&iter); | |
2336 | if (!node) { | |
2337 | goto end; | |
2338 | } | |
2339 | ||
2340 | app_ctx = caa_container_of(node, struct ust_app_ctx, node); | |
2341 | ||
2342 | end: | |
2343 | return app_ctx; | |
2344 | } | |
2345 | ||
7972aab2 DG |
2346 | /* |
2347 | * Create a context for the channel on the tracer. | |
2348 | * | |
2349 | * Called with UST app session lock held and a RCU read side lock. | |
2350 | */ | |
2351 | static | |
c9edf082 | 2352 | int create_ust_app_channel_context(struct ust_app_channel *ua_chan, |
bdf64013 | 2353 | struct lttng_ust_context_attr *uctx, |
7972aab2 DG |
2354 | struct ust_app *app) |
2355 | { | |
2356 | int ret = 0; | |
7972aab2 DG |
2357 | struct ust_app_ctx *ua_ctx; |
2358 | ||
2359 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
2360 | ||
6a6b2068 JG |
2361 | ua_ctx = find_ust_app_context(ua_chan->ctx, uctx); |
2362 | if (ua_ctx) { | |
7972aab2 DG |
2363 | ret = -EEXIST; |
2364 | goto error; | |
2365 | } | |
2366 | ||
2367 | ua_ctx = alloc_ust_app_ctx(uctx); | |
2368 | if (ua_ctx == NULL) { | |
2369 | /* malloc failed */ | |
7682f304 | 2370 | ret = -ENOMEM; |
7972aab2 DG |
2371 | goto error; |
2372 | } | |
2373 | ||
2374 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 2375 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 2376 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
2377 | |
2378 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
2379 | if (ret < 0) { | |
2380 | goto error; | |
2381 | } | |
2382 | ||
2383 | error: | |
2384 | return ret; | |
2385 | } | |
2386 | ||
2387 | /* | |
2388 | * Enable on the tracer side a ust app event for the session and channel. | |
2389 | * | |
2390 | * Called with UST app session lock held. | |
2391 | */ | |
2392 | static | |
2393 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
2394 | struct ust_app_event *ua_event, struct ust_app *app) | |
2395 | { | |
2396 | int ret; | |
2397 | ||
2398 | ret = enable_ust_event(app, ua_sess, ua_event); | |
2399 | if (ret < 0) { | |
2400 | goto error; | |
2401 | } | |
2402 | ||
2403 | ua_event->enabled = 1; | |
2404 | ||
2405 | error: | |
2406 | return ret; | |
2407 | } | |
2408 | ||
2409 | /* | |
2410 | * Disable on the tracer side a ust app event for the session and channel. | |
2411 | */ | |
2412 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
2413 | struct ust_app_event *ua_event, struct ust_app *app) | |
2414 | { | |
2415 | int ret; | |
2416 | ||
2417 | ret = disable_ust_event(app, ua_sess, ua_event); | |
2418 | if (ret < 0) { | |
2419 | goto error; | |
2420 | } | |
2421 | ||
2422 | ua_event->enabled = 0; | |
2423 | ||
2424 | error: | |
2425 | return ret; | |
2426 | } | |
2427 | ||
2428 | /* | |
2429 | * Lookup ust app channel for session and disable it on the tracer side. | |
2430 | */ | |
2431 | static | |
2432 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
2433 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
2434 | { | |
2435 | int ret; | |
2436 | ||
2437 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2438 | if (ret < 0) { | |
2439 | goto error; | |
2440 | } | |
2441 | ||
2442 | ua_chan->enabled = 0; | |
2443 | ||
2444 | error: | |
2445 | return ret; | |
2446 | } | |
2447 | ||
2448 | /* | |
2449 | * Lookup ust app channel for session and enable it on the tracer side. This | |
2450 | * MUST be called with a RCU read side lock acquired. | |
2451 | */ | |
2452 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
2453 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
2454 | { | |
2455 | int ret = 0; | |
2456 | struct lttng_ht_iter iter; | |
2457 | struct lttng_ht_node_str *ua_chan_node; | |
2458 | struct ust_app_channel *ua_chan; | |
2459 | ||
2460 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
2461 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
2462 | if (ua_chan_node == NULL) { | |
d9bf3ca4 | 2463 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
2464 | uchan->name, ua_sess->tracing_id); |
2465 | goto error; | |
2466 | } | |
2467 | ||
2468 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2469 | ||
2470 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
2471 | if (ret < 0) { | |
2472 | goto error; | |
2473 | } | |
2474 | ||
2475 | error: | |
2476 | return ret; | |
2477 | } | |
2478 | ||
2479 | /* | |
2480 | * Ask the consumer to create a channel and get it if successful. | |
2481 | * | |
fad1ed2f JR |
2482 | * Called with UST app session lock held. |
2483 | * | |
7972aab2 DG |
2484 | * Return 0 on success or else a negative value. |
2485 | */ | |
2486 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
2487 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
e098433c JG |
2488 | int bitness, struct ust_registry_session *registry, |
2489 | uint64_t trace_archive_id) | |
7972aab2 DG |
2490 | { |
2491 | int ret; | |
2492 | unsigned int nb_fd = 0; | |
2493 | struct consumer_socket *socket; | |
2494 | ||
2495 | assert(usess); | |
2496 | assert(ua_sess); | |
2497 | assert(ua_chan); | |
2498 | assert(registry); | |
2499 | ||
2500 | rcu_read_lock(); | |
2501 | health_code_update(); | |
2502 | ||
2503 | /* Get the right consumer socket for the application. */ | |
2504 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
2505 | if (!socket) { | |
2506 | ret = -EINVAL; | |
2507 | goto error; | |
2508 | } | |
2509 | ||
2510 | health_code_update(); | |
2511 | ||
2512 | /* Need one fd for the channel. */ | |
2513 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2514 | if (ret < 0) { | |
2515 | ERR("Exhausted number of available FD upon create channel"); | |
2516 | goto error; | |
2517 | } | |
2518 | ||
2519 | /* | |
2520 | * Ask consumer to create channel. The consumer will return the number of | |
2521 | * stream we have to expect. | |
2522 | */ | |
2523 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
e098433c | 2524 | registry, trace_archive_id); |
7972aab2 DG |
2525 | if (ret < 0) { |
2526 | goto error_ask; | |
2527 | } | |
2528 | ||
2529 | /* | |
2530 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2531 | * stream (2 being the default value here). | |
2532 | */ | |
2533 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2534 | ||
2535 | /* Reserve the amount of file descriptor we need. */ | |
2536 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2537 | if (ret < 0) { | |
2538 | ERR("Exhausted number of available FD upon create channel"); | |
2539 | goto error_fd_get_stream; | |
2540 | } | |
2541 | ||
2542 | health_code_update(); | |
2543 | ||
2544 | /* | |
2545 | * Now get the channel from the consumer. This call wil populate the stream | |
2546 | * list of that channel and set the ust objects. | |
2547 | */ | |
d9078d0c DG |
2548 | if (usess->consumer->enabled) { |
2549 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2550 | if (ret < 0) { | |
2551 | goto error_destroy; | |
2552 | } | |
7972aab2 DG |
2553 | } |
2554 | ||
2555 | rcu_read_unlock(); | |
2556 | return 0; | |
2557 | ||
2558 | error_destroy: | |
2559 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2560 | error_fd_get_stream: | |
2561 | /* | |
2562 | * Initiate a destroy channel on the consumer since we had an error | |
2563 | * handling it on our side. The return value is of no importance since we | |
2564 | * already have a ret value set by the previous error that we need to | |
2565 | * return. | |
2566 | */ | |
2567 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2568 | error_ask: | |
2569 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2570 | error: | |
2571 | health_code_update(); | |
2572 | rcu_read_unlock(); | |
2573 | return ret; | |
2574 | } | |
2575 | ||
2576 | /* | |
2577 | * Duplicate the ust data object of the ust app stream and save it in the | |
2578 | * buffer registry stream. | |
2579 | * | |
2580 | * Return 0 on success or else a negative value. | |
2581 | */ | |
2582 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2583 | struct ust_app_stream *stream) | |
2584 | { | |
2585 | int ret; | |
2586 | ||
2587 | assert(reg_stream); | |
2588 | assert(stream); | |
2589 | ||
2590 | /* Reserve the amount of file descriptor we need. */ | |
2591 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2592 | if (ret < 0) { | |
2593 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2594 | goto error; | |
2595 | } | |
2596 | ||
2597 | /* Duplicate object for stream once the original is in the registry. */ | |
2598 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2599 | reg_stream->obj.ust); | |
2600 | if (ret < 0) { | |
2601 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2602 | reg_stream->obj.ust, stream->obj, ret); | |
2603 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2604 | goto error; | |
2605 | } | |
2606 | stream->handle = stream->obj->handle; | |
2607 | ||
2608 | error: | |
2609 | return ret; | |
2610 | } | |
2611 | ||
2612 | /* | |
2613 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2614 | * buffer registry channel. | |
2615 | * | |
2616 | * Return 0 on success or else a negative value. | |
2617 | */ | |
2618 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2619 | struct ust_app_channel *ua_chan) | |
2620 | { | |
2621 | int ret; | |
2622 | ||
2623 | assert(reg_chan); | |
2624 | assert(ua_chan); | |
2625 | ||
2626 | /* Need two fds for the channel. */ | |
2627 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2628 | if (ret < 0) { | |
2629 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2630 | goto error_fd_get; | |
2631 | } | |
2632 | ||
2633 | /* Duplicate object for stream once the original is in the registry. */ | |
2634 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2635 | if (ret < 0) { | |
2636 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2637 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2638 | goto error; | |
2639 | } | |
2640 | ua_chan->handle = ua_chan->obj->handle; | |
2641 | ||
2642 | return 0; | |
2643 | ||
2644 | error: | |
2645 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2646 | error_fd_get: | |
2647 | return ret; | |
2648 | } | |
2649 | ||
2650 | /* | |
2651 | * For a given channel buffer registry, setup all streams of the given ust | |
2652 | * application channel. | |
2653 | * | |
2654 | * Return 0 on success or else a negative value. | |
2655 | */ | |
2656 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
fb45065e MD |
2657 | struct ust_app_channel *ua_chan, |
2658 | struct ust_app *app) | |
7972aab2 DG |
2659 | { |
2660 | int ret = 0; | |
2661 | struct ust_app_stream *stream, *stmp; | |
2662 | ||
2663 | assert(reg_chan); | |
2664 | assert(ua_chan); | |
2665 | ||
2666 | DBG2("UST app setup buffer registry stream"); | |
2667 | ||
2668 | /* Send all streams to application. */ | |
2669 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2670 | struct buffer_reg_stream *reg_stream; | |
2671 | ||
2672 | ret = buffer_reg_stream_create(®_stream); | |
2673 | if (ret < 0) { | |
2674 | goto error; | |
2675 | } | |
2676 | ||
2677 | /* | |
2678 | * Keep original pointer and nullify it in the stream so the delete | |
2679 | * stream call does not release the object. | |
2680 | */ | |
2681 | reg_stream->obj.ust = stream->obj; | |
2682 | stream->obj = NULL; | |
2683 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2684 | |
7972aab2 DG |
2685 | /* We don't need the streams anymore. */ |
2686 | cds_list_del(&stream->list); | |
fb45065e | 2687 | delete_ust_app_stream(-1, stream, app); |
7972aab2 | 2688 | } |
421cb601 | 2689 | |
7972aab2 DG |
2690 | error: |
2691 | return ret; | |
2692 | } | |
2693 | ||
2694 | /* | |
2695 | * Create a buffer registry channel for the given session registry and | |
2696 | * application channel object. If regp pointer is valid, it's set with the | |
2697 | * created object. Important, the created object is NOT added to the session | |
2698 | * registry hash table. | |
2699 | * | |
2700 | * Return 0 on success else a negative value. | |
2701 | */ | |
2702 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2703 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2704 | { | |
2705 | int ret; | |
2706 | struct buffer_reg_channel *reg_chan = NULL; | |
2707 | ||
2708 | assert(reg_sess); | |
2709 | assert(ua_chan); | |
2710 | ||
2711 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2712 | ||
2713 | /* Create buffer registry channel. */ | |
2714 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2715 | if (ret < 0) { | |
2716 | goto error_create; | |
421cb601 | 2717 | } |
7972aab2 DG |
2718 | assert(reg_chan); |
2719 | reg_chan->consumer_key = ua_chan->key; | |
8c924c7b | 2720 | reg_chan->subbuf_size = ua_chan->attr.subbuf_size; |
d07ceecd | 2721 | reg_chan->num_subbuf = ua_chan->attr.num_subbuf; |
421cb601 | 2722 | |
7972aab2 DG |
2723 | /* Create and add a channel registry to session. */ |
2724 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2725 | ua_chan->tracing_channel_id); | |
2726 | if (ret < 0) { | |
2727 | goto error; | |
d88aee68 | 2728 | } |
7972aab2 | 2729 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2730 | |
7972aab2 DG |
2731 | if (regp) { |
2732 | *regp = reg_chan; | |
3d8ca23b | 2733 | } |
d88aee68 | 2734 | |
7972aab2 | 2735 | return 0; |
3d8ca23b DG |
2736 | |
2737 | error: | |
7972aab2 DG |
2738 | /* Safe because the registry channel object was not added to any HT. */ |
2739 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2740 | error_create: | |
3d8ca23b | 2741 | return ret; |
421cb601 DG |
2742 | } |
2743 | ||
55cc08a6 | 2744 | /* |
7972aab2 DG |
2745 | * Setup buffer registry channel for the given session registry and application |
2746 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2747 | * |
7972aab2 | 2748 | * Return 0 on success else a negative value. |
55cc08a6 | 2749 | */ |
7972aab2 | 2750 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
fb45065e MD |
2751 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan, |
2752 | struct ust_app *app) | |
55cc08a6 | 2753 | { |
7972aab2 | 2754 | int ret; |
55cc08a6 | 2755 | |
7972aab2 DG |
2756 | assert(reg_sess); |
2757 | assert(reg_chan); | |
2758 | assert(ua_chan); | |
2759 | assert(ua_chan->obj); | |
55cc08a6 | 2760 | |
7972aab2 | 2761 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2762 | |
7972aab2 | 2763 | /* Setup all streams for the registry. */ |
fb45065e | 2764 | ret = setup_buffer_reg_streams(reg_chan, ua_chan, app); |
7972aab2 | 2765 | if (ret < 0) { |
55cc08a6 DG |
2766 | goto error; |
2767 | } | |
2768 | ||
7972aab2 DG |
2769 | reg_chan->obj.ust = ua_chan->obj; |
2770 | ua_chan->obj = NULL; | |
55cc08a6 | 2771 | |
7972aab2 | 2772 | return 0; |
55cc08a6 DG |
2773 | |
2774 | error: | |
7972aab2 DG |
2775 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2776 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2777 | return ret; |
2778 | } | |
2779 | ||
edb67388 | 2780 | /* |
7972aab2 | 2781 | * Send buffer registry channel to the application. |
d0b96690 | 2782 | * |
7972aab2 | 2783 | * Return 0 on success else a negative value. |
edb67388 | 2784 | */ |
7972aab2 DG |
2785 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2786 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2787 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2788 | { |
2789 | int ret; | |
7972aab2 | 2790 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2791 | |
7972aab2 DG |
2792 | assert(reg_chan); |
2793 | assert(app); | |
2794 | assert(ua_sess); | |
2795 | assert(ua_chan); | |
2796 | ||
2797 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2798 | ||
2799 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2800 | if (ret < 0) { |
2801 | goto error; | |
2802 | } | |
2803 | ||
7972aab2 DG |
2804 | /* Send channel to the application. */ |
2805 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
2806 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
2807 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
2808 | goto error; | |
2809 | } else if (ret < 0) { | |
7972aab2 DG |
2810 | goto error; |
2811 | } | |
2812 | ||
2813 | health_code_update(); | |
2814 | ||
2815 | /* Send all streams to application. */ | |
2816 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2817 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2818 | struct ust_app_stream stream; | |
2819 | ||
2820 | ret = duplicate_stream_object(reg_stream, &stream); | |
2821 | if (ret < 0) { | |
2822 | goto error_stream_unlock; | |
2823 | } | |
2824 | ||
2825 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2826 | if (ret < 0) { | |
fb45065e | 2827 | (void) release_ust_app_stream(-1, &stream, app); |
a7169585 MD |
2828 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
2829 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
a7169585 | 2830 | } |
7972aab2 DG |
2831 | goto error_stream_unlock; |
2832 | } | |
edb67388 | 2833 | |
7972aab2 DG |
2834 | /* |
2835 | * The return value is not important here. This function will output an | |
2836 | * error if needed. | |
2837 | */ | |
fb45065e | 2838 | (void) release_ust_app_stream(-1, &stream, app); |
7972aab2 DG |
2839 | } |
2840 | ua_chan->is_sent = 1; | |
2841 | ||
2842 | error_stream_unlock: | |
2843 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2844 | error: |
2845 | return ret; | |
2846 | } | |
2847 | ||
9730260e | 2848 | /* |
7972aab2 DG |
2849 | * Create and send to the application the created buffers with per UID buffers. |
2850 | * | |
9acdc1d6 | 2851 | * This MUST be called with a RCU read side lock acquired. |
71e0a100 | 2852 | * The session list lock and the session's lock must be acquired. |
9acdc1d6 | 2853 | * |
7972aab2 | 2854 | * Return 0 on success else a negative value. |
9730260e | 2855 | */ |
7972aab2 DG |
2856 | static int create_channel_per_uid(struct ust_app *app, |
2857 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2858 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2859 | { |
2860 | int ret; | |
7972aab2 DG |
2861 | struct buffer_reg_uid *reg_uid; |
2862 | struct buffer_reg_channel *reg_chan; | |
e098433c JG |
2863 | struct ltt_session *session; |
2864 | enum lttng_error_code notification_ret; | |
2865 | struct ust_registry_channel *chan_reg; | |
9730260e | 2866 | |
7972aab2 DG |
2867 | assert(app); |
2868 | assert(usess); | |
2869 | assert(ua_sess); | |
2870 | assert(ua_chan); | |
2871 | ||
2872 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2873 | ||
2874 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2875 | /* | |
2876 | * The session creation handles the creation of this global registry | |
2877 | * object. If none can be find, there is a code flow problem or a | |
2878 | * teardown race. | |
2879 | */ | |
2880 | assert(reg_uid); | |
2881 | ||
2882 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2883 | reg_uid); | |
2721f7ea JG |
2884 | if (reg_chan) { |
2885 | goto send_channel; | |
2886 | } | |
7972aab2 | 2887 | |
2721f7ea JG |
2888 | /* Create the buffer registry channel object. */ |
2889 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2890 | if (ret < 0) { | |
2891 | ERR("Error creating the UST channel \"%s\" registry instance", | |
f14256d6 | 2892 | ua_chan->name); |
2721f7ea JG |
2893 | goto error; |
2894 | } | |
f14256d6 | 2895 | |
e098433c JG |
2896 | session = session_find_by_id(ua_sess->tracing_id); |
2897 | assert(session); | |
2898 | assert(pthread_mutex_trylock(&session->lock)); | |
2899 | assert(session_trylock_list()); | |
2900 | ||
2721f7ea JG |
2901 | /* |
2902 | * Create the buffers on the consumer side. This call populates the | |
2903 | * ust app channel object with all streams and data object. | |
2904 | */ | |
2905 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
e098433c JG |
2906 | app->bits_per_long, reg_uid->registry->reg.ust, |
2907 | session->current_archive_id); | |
2721f7ea JG |
2908 | if (ret < 0) { |
2909 | ERR("Error creating UST channel \"%s\" on the consumer daemon", | |
2910 | ua_chan->name); | |
7972aab2 DG |
2911 | |
2912 | /* | |
2721f7ea JG |
2913 | * Let's remove the previously created buffer registry channel so |
2914 | * it's not visible anymore in the session registry. | |
7972aab2 | 2915 | */ |
2721f7ea JG |
2916 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, |
2917 | ua_chan->tracing_channel_id, false); | |
2918 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
2919 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2920 | goto error; | |
7972aab2 DG |
2921 | } |
2922 | ||
2721f7ea JG |
2923 | /* |
2924 | * Setup the streams and add it to the session registry. | |
2925 | */ | |
2926 | ret = setup_buffer_reg_channel(reg_uid->registry, | |
2927 | ua_chan, reg_chan, app); | |
2928 | if (ret < 0) { | |
2929 | ERR("Error setting up UST channel \"%s\"", ua_chan->name); | |
2930 | goto error; | |
2931 | } | |
2932 | ||
e098433c JG |
2933 | /* Notify the notification subsystem of the channel's creation. */ |
2934 | pthread_mutex_lock(®_uid->registry->reg.ust->lock); | |
2935 | chan_reg = ust_registry_channel_find(reg_uid->registry->reg.ust, | |
2936 | ua_chan->tracing_channel_id); | |
2937 | assert(chan_reg); | |
2938 | chan_reg->consumer_key = ua_chan->key; | |
2939 | chan_reg = NULL; | |
2940 | pthread_mutex_unlock(®_uid->registry->reg.ust->lock); | |
e9404c27 | 2941 | |
e098433c JG |
2942 | notification_ret = notification_thread_command_add_channel( |
2943 | notification_thread_handle, session->name, | |
2944 | ua_sess->euid, ua_sess->egid, | |
2945 | ua_chan->name, | |
2946 | ua_chan->key, | |
2947 | LTTNG_DOMAIN_UST, | |
2948 | ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf); | |
2949 | if (notification_ret != LTTNG_OK) { | |
2950 | ret = - (int) notification_ret; | |
2951 | ERR("Failed to add channel to notification thread"); | |
2952 | goto error; | |
e9404c27 JG |
2953 | } |
2954 | ||
2721f7ea | 2955 | send_channel: |
66ff8e3f JG |
2956 | /* Send buffers to the application. */ |
2957 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
2958 | if (ret < 0) { | |
2959 | if (ret != -ENOTCONN) { | |
2960 | ERR("Error sending channel to application"); | |
2961 | } | |
2962 | goto error; | |
2963 | } | |
2964 | ||
9730260e DG |
2965 | error: |
2966 | return ret; | |
2967 | } | |
2968 | ||
78f0bacd | 2969 | /* |
7972aab2 DG |
2970 | * Create and send to the application the created buffers with per PID buffers. |
2971 | * | |
fad1ed2f | 2972 | * Called with UST app session lock held. |
71e0a100 | 2973 | * The session list lock and the session's lock must be acquired. |
fad1ed2f | 2974 | * |
7972aab2 | 2975 | * Return 0 on success else a negative value. |
78f0bacd | 2976 | */ |
7972aab2 DG |
2977 | static int create_channel_per_pid(struct ust_app *app, |
2978 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2979 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2980 | { |
8535a6d9 | 2981 | int ret; |
7972aab2 | 2982 | struct ust_registry_session *registry; |
e9404c27 JG |
2983 | enum lttng_error_code cmd_ret; |
2984 | struct ltt_session *session; | |
2985 | uint64_t chan_reg_key; | |
2986 | struct ust_registry_channel *chan_reg; | |
78f0bacd | 2987 | |
7972aab2 DG |
2988 | assert(app); |
2989 | assert(usess); | |
2990 | assert(ua_sess); | |
2991 | assert(ua_chan); | |
2992 | ||
2993 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2994 | ||
2995 | rcu_read_lock(); | |
2996 | ||
2997 | registry = get_session_registry(ua_sess); | |
fad1ed2f | 2998 | /* The UST app session lock is held, registry shall not be null. */ |
7972aab2 DG |
2999 | assert(registry); |
3000 | ||
3001 | /* Create and add a new channel registry to session. */ | |
3002 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd | 3003 | if (ret < 0) { |
f14256d6 MD |
3004 | ERR("Error creating the UST channel \"%s\" registry instance", |
3005 | ua_chan->name); | |
78f0bacd DG |
3006 | goto error; |
3007 | } | |
3008 | ||
e098433c JG |
3009 | session = session_find_by_id(ua_sess->tracing_id); |
3010 | assert(session); | |
3011 | ||
3012 | assert(pthread_mutex_trylock(&session->lock)); | |
3013 | assert(session_trylock_list()); | |
3014 | ||
7972aab2 DG |
3015 | /* Create and get channel on the consumer side. */ |
3016 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
e098433c JG |
3017 | app->bits_per_long, registry, |
3018 | session->current_archive_id); | |
7972aab2 | 3019 | if (ret < 0) { |
f14256d6 MD |
3020 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
3021 | ua_chan->name); | |
5b951542 | 3022 | goto error_remove_from_registry; |
7972aab2 DG |
3023 | } |
3024 | ||
3025 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
3026 | if (ret < 0) { | |
a7169585 MD |
3027 | if (ret != -ENOTCONN) { |
3028 | ERR("Error sending channel to application"); | |
3029 | } | |
5b951542 | 3030 | goto error_remove_from_registry; |
7972aab2 | 3031 | } |
8535a6d9 | 3032 | |
e9404c27 JG |
3033 | chan_reg_key = ua_chan->key; |
3034 | pthread_mutex_lock(®istry->lock); | |
3035 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
3036 | assert(chan_reg); | |
3037 | chan_reg->consumer_key = ua_chan->key; | |
3038 | pthread_mutex_unlock(®istry->lock); | |
3039 | ||
3040 | cmd_ret = notification_thread_command_add_channel( | |
3041 | notification_thread_handle, session->name, | |
3042 | ua_sess->euid, ua_sess->egid, | |
3043 | ua_chan->name, | |
3044 | ua_chan->key, | |
3045 | LTTNG_DOMAIN_UST, | |
3046 | ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf); | |
3047 | if (cmd_ret != LTTNG_OK) { | |
3048 | ret = - (int) cmd_ret; | |
3049 | ERR("Failed to add channel to notification thread"); | |
5b951542 | 3050 | goto error_remove_from_registry; |
e9404c27 JG |
3051 | } |
3052 | ||
5b951542 MD |
3053 | error_remove_from_registry: |
3054 | if (ret) { | |
3055 | ust_registry_channel_del_free(registry, ua_chan->key, false); | |
3056 | } | |
78f0bacd | 3057 | error: |
7972aab2 | 3058 | rcu_read_unlock(); |
78f0bacd DG |
3059 | return ret; |
3060 | } | |
3061 | ||
3062 | /* | |
7972aab2 DG |
3063 | * From an already allocated ust app channel, create the channel buffers if |
3064 | * need and send it to the application. This MUST be called with a RCU read | |
3065 | * side lock acquired. | |
3066 | * | |
fad1ed2f JR |
3067 | * Called with UST app session lock held. |
3068 | * | |
a7169585 MD |
3069 | * Return 0 on success or else a negative value. Returns -ENOTCONN if |
3070 | * the application exited concurrently. | |
78f0bacd | 3071 | */ |
7972aab2 DG |
3072 | static int do_create_channel(struct ust_app *app, |
3073 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
3074 | struct ust_app_channel *ua_chan) | |
78f0bacd | 3075 | { |
7972aab2 | 3076 | int ret; |
78f0bacd | 3077 | |
7972aab2 DG |
3078 | assert(app); |
3079 | assert(usess); | |
3080 | assert(ua_sess); | |
3081 | assert(ua_chan); | |
3082 | ||
3083 | /* Handle buffer type before sending the channel to the application. */ | |
3084 | switch (usess->buffer_type) { | |
3085 | case LTTNG_BUFFER_PER_UID: | |
3086 | { | |
3087 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
3088 | if (ret < 0) { | |
3089 | goto error; | |
3090 | } | |
3091 | break; | |
3092 | } | |
3093 | case LTTNG_BUFFER_PER_PID: | |
3094 | { | |
3095 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
3096 | if (ret < 0) { | |
3097 | goto error; | |
3098 | } | |
3099 | break; | |
3100 | } | |
3101 | default: | |
3102 | assert(0); | |
3103 | ret = -EINVAL; | |
78f0bacd DG |
3104 | goto error; |
3105 | } | |
3106 | ||
7972aab2 DG |
3107 | /* Initialize ust objd object using the received handle and add it. */ |
3108 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
3109 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 3110 | |
7972aab2 DG |
3111 | /* If channel is not enabled, disable it on the tracer */ |
3112 | if (!ua_chan->enabled) { | |
3113 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
3114 | if (ret < 0) { | |
3115 | goto error; | |
3116 | } | |
78f0bacd DG |
3117 | } |
3118 | ||
3119 | error: | |
3120 | return ret; | |
3121 | } | |
3122 | ||
284d8f55 | 3123 | /* |
4d710ac2 DG |
3124 | * Create UST app channel and create it on the tracer. Set ua_chanp of the |
3125 | * newly created channel if not NULL. | |
d0b96690 | 3126 | * |
36b588ed | 3127 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 | 3128 | * |
a7169585 MD |
3129 | * Return 0 on success or else a negative value. Returns -ENOTCONN if |
3130 | * the application exited concurrently. | |
284d8f55 | 3131 | */ |
4d710ac2 DG |
3132 | static int create_ust_app_channel(struct ust_app_session *ua_sess, |
3133 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
7972aab2 | 3134 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 3135 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
3136 | { |
3137 | int ret = 0; | |
bec39940 DG |
3138 | struct lttng_ht_iter iter; |
3139 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
3140 | struct ust_app_channel *ua_chan; |
3141 | ||
3142 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3143 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
3144 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 3145 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 3146 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 3147 | goto end; |
5b4a0ec0 DG |
3148 | } |
3149 | ||
d0b96690 | 3150 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
3151 | if (ua_chan == NULL) { |
3152 | /* Only malloc can fail here */ | |
4d710ac2 | 3153 | ret = -ENOMEM; |
094d1690 | 3154 | goto error_alloc; |
fc34caaa DG |
3155 | } |
3156 | shadow_copy_channel(ua_chan, uchan); | |
3157 | ||
ffe60014 DG |
3158 | /* Set channel type. */ |
3159 | ua_chan->attr.type = type; | |
3160 | ||
7972aab2 | 3161 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
5b4a0ec0 DG |
3162 | if (ret < 0) { |
3163 | goto error; | |
3164 | } | |
3165 | ||
fc34caaa | 3166 | DBG2("UST app create channel %s for PID %d completed", ua_chan->name, |
852d0037 | 3167 | app->pid); |
fc34caaa | 3168 | |
d0b96690 DG |
3169 | /* Only add the channel if successful on the tracer side. */ |
3170 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
fc34caaa | 3171 | end: |
4d710ac2 DG |
3172 | if (ua_chanp) { |
3173 | *ua_chanp = ua_chan; | |
3174 | } | |
3175 | ||
3176 | /* Everything went well. */ | |
3177 | return 0; | |
5b4a0ec0 DG |
3178 | |
3179 | error: | |
d0b96690 | 3180 | delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app); |
094d1690 | 3181 | error_alloc: |
4d710ac2 | 3182 | return ret; |
5b4a0ec0 DG |
3183 | } |
3184 | ||
3185 | /* | |
3186 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
3187 | * |
3188 | * Called with ust app session mutex held. | |
5b4a0ec0 | 3189 | */ |
edb67388 DG |
3190 | static |
3191 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
3192 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
3193 | struct ust_app *app) | |
284d8f55 | 3194 | { |
edb67388 | 3195 | int ret = 0; |
5b4a0ec0 | 3196 | struct ust_app_event *ua_event; |
284d8f55 | 3197 | |
5b4a0ec0 | 3198 | /* Get event node */ |
18eace3b | 3199 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 3200 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 3201 | if (ua_event != NULL) { |
fc34caaa | 3202 | ret = -EEXIST; |
edb67388 DG |
3203 | goto end; |
3204 | } | |
5b4a0ec0 | 3205 | |
edb67388 DG |
3206 | /* Does not exist so create one */ |
3207 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); | |
3208 | if (ua_event == NULL) { | |
3209 | /* Only malloc can failed so something is really wrong */ | |
3210 | ret = -ENOMEM; | |
fc34caaa | 3211 | goto end; |
5b4a0ec0 | 3212 | } |
edb67388 | 3213 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 3214 | |
edb67388 | 3215 | /* Create it on the tracer side */ |
5b4a0ec0 | 3216 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 3217 | if (ret < 0) { |
fc34caaa | 3218 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 3219 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
3220 | goto error; |
3221 | } | |
3222 | ||
d0b96690 | 3223 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 3224 | |
fc34caaa | 3225 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 3226 | app->pid); |
7f79d3a1 | 3227 | |
edb67388 | 3228 | end: |
fc34caaa DG |
3229 | return ret; |
3230 | ||
5b4a0ec0 | 3231 | error: |
fc34caaa | 3232 | /* Valid. Calling here is already in a read side lock */ |
fb45065e | 3233 | delete_ust_app_event(-1, ua_event, app); |
edb67388 | 3234 | return ret; |
5b4a0ec0 DG |
3235 | } |
3236 | ||
3237 | /* | |
3238 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 3239 | * |
7972aab2 | 3240 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
3241 | */ |
3242 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
ad7a9107 | 3243 | struct ust_app *app, struct consumer_output *consumer) |
5b4a0ec0 DG |
3244 | { |
3245 | int ret = 0; | |
ffe60014 | 3246 | struct ust_app_channel *metadata; |
d88aee68 | 3247 | struct consumer_socket *socket; |
7972aab2 | 3248 | struct ust_registry_session *registry; |
e098433c | 3249 | struct ltt_session *session; |
5b4a0ec0 | 3250 | |
ffe60014 DG |
3251 | assert(ua_sess); |
3252 | assert(app); | |
d88aee68 | 3253 | assert(consumer); |
5b4a0ec0 | 3254 | |
7972aab2 | 3255 | registry = get_session_registry(ua_sess); |
fad1ed2f | 3256 | /* The UST app session is held registry shall not be null. */ |
7972aab2 DG |
3257 | assert(registry); |
3258 | ||
ce34fcd0 MD |
3259 | pthread_mutex_lock(®istry->lock); |
3260 | ||
1b532a60 DG |
3261 | /* Metadata already exists for this registry or it was closed previously */ |
3262 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
3263 | ret = 0; |
3264 | goto error; | |
5b4a0ec0 DG |
3265 | } |
3266 | ||
ffe60014 | 3267 | /* Allocate UST metadata */ |
d0b96690 | 3268 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
3269 | if (!metadata) { |
3270 | /* malloc() failed */ | |
3271 | ret = -ENOMEM; | |
3272 | goto error; | |
3273 | } | |
5b4a0ec0 | 3274 | |
ad7a9107 | 3275 | memcpy(&metadata->attr, &ua_sess->metadata_attr, sizeof(metadata->attr)); |
5b4a0ec0 | 3276 | |
7972aab2 DG |
3277 | /* Need one fd for the channel. */ |
3278 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
3279 | if (ret < 0) { | |
3280 | ERR("Exhausted number of available FD upon create metadata"); | |
3281 | goto error; | |
3282 | } | |
3283 | ||
4dc3dfc5 DG |
3284 | /* Get the right consumer socket for the application. */ |
3285 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
3286 | if (!socket) { | |
3287 | ret = -EINVAL; | |
3288 | goto error_consumer; | |
3289 | } | |
3290 | ||
331744e3 JD |
3291 | /* |
3292 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
3293 | * to the registry *before* we ask the consumer so we avoid the race of the | |
3294 | * consumer requesting the metadata and the ask_channel call on our side | |
3295 | * did not returned yet. | |
3296 | */ | |
3297 | registry->metadata_key = metadata->key; | |
3298 | ||
e098433c JG |
3299 | session = session_find_by_id(ua_sess->tracing_id); |
3300 | assert(session); | |
3301 | ||
3302 | assert(pthread_mutex_trylock(&session->lock)); | |
3303 | assert(session_trylock_list()); | |
3304 | ||
d88aee68 DG |
3305 | /* |
3306 | * Ask the metadata channel creation to the consumer. The metadata object | |
3307 | * will be created by the consumer and kept their. However, the stream is | |
3308 | * never added or monitored until we do a first push metadata to the | |
3309 | * consumer. | |
3310 | */ | |
7972aab2 | 3311 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
e098433c | 3312 | registry, session->current_archive_id); |
d88aee68 | 3313 | if (ret < 0) { |
f2a444f1 DG |
3314 | /* Nullify the metadata key so we don't try to close it later on. */ |
3315 | registry->metadata_key = 0; | |
d88aee68 DG |
3316 | goto error_consumer; |
3317 | } | |
3318 | ||
3319 | /* | |
3320 | * The setup command will make the metadata stream be sent to the relayd, | |
3321 | * if applicable, and the thread managing the metadatas. This is important | |
3322 | * because after this point, if an error occurs, the only way the stream | |
3323 | * can be deleted is to be monitored in the consumer. | |
3324 | */ | |
7972aab2 | 3325 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 3326 | if (ret < 0) { |
f2a444f1 DG |
3327 | /* Nullify the metadata key so we don't try to close it later on. */ |
3328 | registry->metadata_key = 0; | |
d88aee68 | 3329 | goto error_consumer; |
5b4a0ec0 DG |
3330 | } |
3331 | ||
7972aab2 DG |
3332 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
3333 | metadata->key, app->pid); | |
5b4a0ec0 | 3334 | |
d88aee68 | 3335 | error_consumer: |
b80f0b6c | 3336 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 3337 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 3338 | error: |
ce34fcd0 | 3339 | pthread_mutex_unlock(®istry->lock); |
ffe60014 | 3340 | return ret; |
5b4a0ec0 DG |
3341 | } |
3342 | ||
5b4a0ec0 | 3343 | /* |
d88aee68 DG |
3344 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
3345 | * acquired before calling this function. | |
5b4a0ec0 DG |
3346 | */ |
3347 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
3348 | { | |
d88aee68 | 3349 | struct ust_app *app = NULL; |
bec39940 DG |
3350 | struct lttng_ht_node_ulong *node; |
3351 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 3352 | |
bec39940 DG |
3353 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
3354 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
3355 | if (node == NULL) { |
3356 | DBG2("UST app no found with pid %d", pid); | |
3357 | goto error; | |
3358 | } | |
5b4a0ec0 DG |
3359 | |
3360 | DBG2("Found UST app by pid %d", pid); | |
3361 | ||
d88aee68 | 3362 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
3363 | |
3364 | error: | |
d88aee68 | 3365 | return app; |
5b4a0ec0 DG |
3366 | } |
3367 | ||
d88aee68 DG |
3368 | /* |
3369 | * Allocate and init an UST app object using the registration information and | |
3370 | * the command socket. This is called when the command socket connects to the | |
3371 | * session daemon. | |
3372 | * | |
3373 | * The object is returned on success or else NULL. | |
3374 | */ | |
d0b96690 | 3375 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 3376 | { |
d0b96690 DG |
3377 | struct ust_app *lta = NULL; |
3378 | ||
3379 | assert(msg); | |
3380 | assert(sock >= 0); | |
3381 | ||
3382 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 3383 | |
173af62f DG |
3384 | if ((msg->bits_per_long == 64 && |
3385 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
3386 | || (msg->bits_per_long == 32 && | |
3387 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 3388 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
3389 | "%d-bit long, but no consumerd for this size is available.\n", |
3390 | msg->name, msg->pid, msg->bits_per_long); | |
3391 | goto error; | |
3f2c5fcc | 3392 | } |
d0b96690 | 3393 | |
5b4a0ec0 DG |
3394 | lta = zmalloc(sizeof(struct ust_app)); |
3395 | if (lta == NULL) { | |
3396 | PERROR("malloc"); | |
d0b96690 | 3397 | goto error; |
5b4a0ec0 DG |
3398 | } |
3399 | ||
3400 | lta->ppid = msg->ppid; | |
3401 | lta->uid = msg->uid; | |
3402 | lta->gid = msg->gid; | |
d0b96690 | 3403 | |
7753dea8 | 3404 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
3405 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
3406 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
3407 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
3408 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
3409 | lta->long_alignment = msg->long_alignment; | |
3410 | lta->byte_order = msg->byte_order; | |
3411 | ||
5b4a0ec0 DG |
3412 | lta->v_major = msg->major; |
3413 | lta->v_minor = msg->minor; | |
d9bf3ca4 | 3414 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 | 3415 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
10b56aef | 3416 | lta->ust_sessions_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3417 | lta->notify_sock = -1; |
d88aee68 DG |
3418 | |
3419 | /* Copy name and make sure it's NULL terminated. */ | |
3420 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
3421 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
3422 | ||
3423 | /* | |
3424 | * Before this can be called, when receiving the registration information, | |
3425 | * the application compatibility is checked. So, at this point, the | |
3426 | * application can work with this session daemon. | |
3427 | */ | |
d0b96690 | 3428 | lta->compatible = 1; |
5b4a0ec0 | 3429 | |
852d0037 | 3430 | lta->pid = msg->pid; |
d0b96690 | 3431 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 3432 | lta->sock = sock; |
fb45065e | 3433 | pthread_mutex_init(<a->sock_lock, NULL); |
d0b96690 | 3434 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 3435 | |
d42f20df | 3436 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
d0b96690 DG |
3437 | error: |
3438 | return lta; | |
3439 | } | |
3440 | ||
d88aee68 DG |
3441 | /* |
3442 | * For a given application object, add it to every hash table. | |
3443 | */ | |
d0b96690 DG |
3444 | void ust_app_add(struct ust_app *app) |
3445 | { | |
3446 | assert(app); | |
3447 | assert(app->notify_sock >= 0); | |
3448 | ||
5b4a0ec0 | 3449 | rcu_read_lock(); |
852d0037 DG |
3450 | |
3451 | /* | |
3452 | * On a re-registration, we want to kick out the previous registration of | |
3453 | * that pid | |
3454 | */ | |
d0b96690 | 3455 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
3456 | |
3457 | /* | |
3458 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
3459 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
3460 | * already in the table. | |
3461 | */ | |
d0b96690 | 3462 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 3463 | |
d0b96690 DG |
3464 | /* Add application to the notify socket hash table. */ |
3465 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
3466 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 3467 | |
d0b96690 | 3468 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
3469 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
3470 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
3471 | app->v_minor); | |
5b4a0ec0 | 3472 | |
d0b96690 DG |
3473 | rcu_read_unlock(); |
3474 | } | |
3475 | ||
d88aee68 DG |
3476 | /* |
3477 | * Set the application version into the object. | |
3478 | * | |
3479 | * Return 0 on success else a negative value either an errno code or a | |
3480 | * LTTng-UST error code. | |
3481 | */ | |
d0b96690 DG |
3482 | int ust_app_version(struct ust_app *app) |
3483 | { | |
d88aee68 DG |
3484 | int ret; |
3485 | ||
d0b96690 | 3486 | assert(app); |
d88aee68 | 3487 | |
fb45065e | 3488 | pthread_mutex_lock(&app->sock_lock); |
d88aee68 | 3489 | ret = ustctl_tracer_version(app->sock, &app->version); |
fb45065e | 3490 | pthread_mutex_unlock(&app->sock_lock); |
d88aee68 DG |
3491 | if (ret < 0) { |
3492 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
5368d366 | 3493 | ERR("UST app %d version failed with ret %d", app->sock, ret); |
d88aee68 | 3494 | } else { |
5368d366 | 3495 | DBG3("UST app %d version failed. Application is dead", app->sock); |
d88aee68 DG |
3496 | } |
3497 | } | |
3498 | ||
3499 | return ret; | |
5b4a0ec0 DG |
3500 | } |
3501 | ||
3502 | /* | |
3503 | * Unregister app by removing it from the global traceable app list and freeing | |
3504 | * the data struct. | |
3505 | * | |
3506 | * The socket is already closed at this point so no close to sock. | |
3507 | */ | |
3508 | void ust_app_unregister(int sock) | |
3509 | { | |
3510 | struct ust_app *lta; | |
bec39940 | 3511 | struct lttng_ht_node_ulong *node; |
c4b88406 | 3512 | struct lttng_ht_iter ust_app_sock_iter; |
bec39940 | 3513 | struct lttng_ht_iter iter; |
d42f20df | 3514 | struct ust_app_session *ua_sess; |
525b0740 | 3515 | int ret; |
5b4a0ec0 DG |
3516 | |
3517 | rcu_read_lock(); | |
886459c6 | 3518 | |
5b4a0ec0 | 3519 | /* Get the node reference for a call_rcu */ |
c4b88406 MD |
3520 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &ust_app_sock_iter); |
3521 | node = lttng_ht_iter_get_node_ulong(&ust_app_sock_iter); | |
d0b96690 | 3522 | assert(node); |
284d8f55 | 3523 | |
852d0037 | 3524 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
3525 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
3526 | ||
d88aee68 | 3527 | /* |
ce34fcd0 MD |
3528 | * For per-PID buffers, perform "push metadata" and flush all |
3529 | * application streams before removing app from hash tables, | |
3530 | * ensuring proper behavior of data_pending check. | |
c4b88406 | 3531 | * Remove sessions so they are not visible during deletion. |
d88aee68 | 3532 | */ |
d42f20df DG |
3533 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, |
3534 | node.node) { | |
7972aab2 DG |
3535 | struct ust_registry_session *registry; |
3536 | ||
d42f20df DG |
3537 | ret = lttng_ht_del(lta->sessions, &iter); |
3538 | if (ret) { | |
3539 | /* The session was already removed so scheduled for teardown. */ | |
3540 | continue; | |
3541 | } | |
3542 | ||
ce34fcd0 MD |
3543 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { |
3544 | (void) ust_app_flush_app_session(lta, ua_sess); | |
3545 | } | |
c4b88406 | 3546 | |
d42f20df DG |
3547 | /* |
3548 | * Add session to list for teardown. This is safe since at this point we | |
3549 | * are the only one using this list. | |
3550 | */ | |
d88aee68 DG |
3551 | pthread_mutex_lock(&ua_sess->lock); |
3552 | ||
b161602a MD |
3553 | if (ua_sess->deleted) { |
3554 | pthread_mutex_unlock(&ua_sess->lock); | |
3555 | continue; | |
3556 | } | |
3557 | ||
d88aee68 DG |
3558 | /* |
3559 | * Normally, this is done in the delete session process which is | |
3560 | * executed in the call rcu below. However, upon registration we can't | |
3561 | * afford to wait for the grace period before pushing data or else the | |
3562 | * data pending feature can race between the unregistration and stop | |
3563 | * command where the data pending command is sent *before* the grace | |
3564 | * period ended. | |
3565 | * | |
3566 | * The close metadata below nullifies the metadata pointer in the | |
3567 | * session so the delete session will NOT push/close a second time. | |
3568 | */ | |
7972aab2 | 3569 | registry = get_session_registry(ua_sess); |
ce34fcd0 | 3570 | if (registry) { |
7972aab2 DG |
3571 | /* Push metadata for application before freeing the application. */ |
3572 | (void) push_metadata(registry, ua_sess->consumer); | |
3573 | ||
3574 | /* | |
3575 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
3576 | * metadata only on destroy trace session in this case. Also, the |
3577 | * previous push metadata could have flag the metadata registry to | |
3578 | * close so don't send a close command if closed. | |
7972aab2 | 3579 | */ |
ce34fcd0 | 3580 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
3581 | /* And ask to close it for this session registry. */ |
3582 | (void) close_metadata(registry, ua_sess->consumer); | |
3583 | } | |
3584 | } | |
d42f20df | 3585 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
c4b88406 | 3586 | |
d88aee68 | 3587 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
3588 | } |
3589 | ||
c4b88406 MD |
3590 | /* Remove application from PID hash table */ |
3591 | ret = lttng_ht_del(ust_app_ht_by_sock, &ust_app_sock_iter); | |
3592 | assert(!ret); | |
3593 | ||
3594 | /* | |
3595 | * Remove application from notify hash table. The thread handling the | |
3596 | * notify socket could have deleted the node so ignore on error because | |
c48239ca JG |
3597 | * either way it's valid. The close of that socket is handled by the |
3598 | * apps_notify_thread. | |
c4b88406 MD |
3599 | */ |
3600 | iter.iter.node = <a->notify_sock_n.node; | |
3601 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3602 | ||
3603 | /* | |
3604 | * Ignore return value since the node might have been removed before by an | |
3605 | * add replace during app registration because the PID can be reassigned by | |
3606 | * the OS. | |
3607 | */ | |
3608 | iter.iter.node = <a->pid_n.node; | |
3609 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3610 | if (ret) { | |
3611 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
3612 | lta->pid); | |
3613 | } | |
3614 | ||
852d0037 DG |
3615 | /* Free memory */ |
3616 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
3617 | ||
5b4a0ec0 DG |
3618 | rcu_read_unlock(); |
3619 | return; | |
284d8f55 DG |
3620 | } |
3621 | ||
5b4a0ec0 DG |
3622 | /* |
3623 | * Fill events array with all events name of all registered apps. | |
3624 | */ | |
3625 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 3626 | { |
5b4a0ec0 DG |
3627 | int ret, handle; |
3628 | size_t nbmem, count = 0; | |
bec39940 | 3629 | struct lttng_ht_iter iter; |
5b4a0ec0 | 3630 | struct ust_app *app; |
c617c0c6 | 3631 | struct lttng_event *tmp_event; |
421cb601 | 3632 | |
5b4a0ec0 | 3633 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
3634 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
3635 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
3636 | PERROR("zmalloc ust app events"); |
3637 | ret = -ENOMEM; | |
421cb601 DG |
3638 | goto error; |
3639 | } | |
3640 | ||
5b4a0ec0 | 3641 | rcu_read_lock(); |
421cb601 | 3642 | |
852d0037 | 3643 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 3644 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 3645 | |
840cb59c | 3646 | health_code_update(); |
86acf0da | 3647 | |
e0c7ec2b DG |
3648 | if (!app->compatible) { |
3649 | /* | |
3650 | * TODO: In time, we should notice the caller of this error by | |
3651 | * telling him that this is a version error. | |
3652 | */ | |
3653 | continue; | |
3654 | } | |
fb45065e | 3655 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 3656 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 3657 | if (handle < 0) { |
ffe60014 DG |
3658 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3659 | ERR("UST app list events getting handle failed for app pid %d", | |
3660 | app->pid); | |
3661 | } | |
fb45065e | 3662 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 DG |
3663 | continue; |
3664 | } | |
421cb601 | 3665 | |
852d0037 | 3666 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 3667 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3668 | /* Handle ustctl error. */ |
3669 | if (ret < 0) { | |
fb45065e MD |
3670 | int release_ret; |
3671 | ||
a2ba1ab0 | 3672 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3673 | ERR("UST app tp list get failed for app %d with ret %d", |
3674 | app->sock, ret); | |
3675 | } else { | |
3676 | DBG3("UST app tp list get failed. Application is dead"); | |
3757b385 DG |
3677 | /* |
3678 | * This is normal behavior, an application can die during the | |
3679 | * creation process. Don't report an error so the execution can | |
3680 | * continue normally. Continue normal execution. | |
3681 | */ | |
3682 | break; | |
ffe60014 | 3683 | } |
98f595d4 | 3684 | free(tmp_event); |
fb45065e | 3685 | release_ret = ustctl_release_handle(app->sock, handle); |
68313703 JG |
3686 | if (release_ret < 0 && |
3687 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3688 | release_ret != -EPIPE) { | |
fb45065e MD |
3689 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3690 | } | |
3691 | pthread_mutex_unlock(&app->sock_lock); | |
ffe60014 DG |
3692 | goto rcu_error; |
3693 | } | |
3694 | ||
840cb59c | 3695 | health_code_update(); |
815564d8 | 3696 | if (count >= nbmem) { |
d7b3776f | 3697 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3698 | struct lttng_event *new_tmp_event; |
3699 | size_t new_nbmem; | |
3700 | ||
3701 | new_nbmem = nbmem << 1; | |
3702 | DBG2("Reallocating event list from %zu to %zu entries", | |
3703 | nbmem, new_nbmem); | |
3704 | new_tmp_event = realloc(tmp_event, | |
3705 | new_nbmem * sizeof(struct lttng_event)); | |
3706 | if (new_tmp_event == NULL) { | |
fb45065e MD |
3707 | int release_ret; |
3708 | ||
5b4a0ec0 | 3709 | PERROR("realloc ust app events"); |
c617c0c6 | 3710 | free(tmp_event); |
5b4a0ec0 | 3711 | ret = -ENOMEM; |
fb45065e | 3712 | release_ret = ustctl_release_handle(app->sock, handle); |
68313703 JG |
3713 | if (release_ret < 0 && |
3714 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3715 | release_ret != -EPIPE) { | |
fb45065e MD |
3716 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3717 | } | |
3718 | pthread_mutex_unlock(&app->sock_lock); | |
5b4a0ec0 DG |
3719 | goto rcu_error; |
3720 | } | |
53efb85a MD |
3721 | /* Zero the new memory */ |
3722 | memset(new_tmp_event + nbmem, 0, | |
3723 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
3724 | nbmem = new_nbmem; | |
3725 | tmp_event = new_tmp_event; | |
5b4a0ec0 | 3726 | } |
c617c0c6 MD |
3727 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
3728 | tmp_event[count].loglevel = uiter.loglevel; | |
3729 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
3730 | tmp_event[count].pid = app->pid; | |
3731 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 3732 | count++; |
421cb601 | 3733 | } |
fb45065e MD |
3734 | ret = ustctl_release_handle(app->sock, handle); |
3735 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 | 3736 | if (ret < 0 && ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
fb45065e MD |
3737 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
3738 | } | |
421cb601 DG |
3739 | } |
3740 | ||
5b4a0ec0 | 3741 | ret = count; |
c617c0c6 | 3742 | *events = tmp_event; |
421cb601 | 3743 | |
5b4a0ec0 | 3744 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 3745 | |
5b4a0ec0 DG |
3746 | rcu_error: |
3747 | rcu_read_unlock(); | |
421cb601 | 3748 | error: |
840cb59c | 3749 | health_code_update(); |
5b4a0ec0 | 3750 | return ret; |
421cb601 DG |
3751 | } |
3752 | ||
f37d259d MD |
3753 | /* |
3754 | * Fill events array with all events name of all registered apps. | |
3755 | */ | |
3756 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
3757 | { | |
3758 | int ret, handle; | |
3759 | size_t nbmem, count = 0; | |
3760 | struct lttng_ht_iter iter; | |
3761 | struct ust_app *app; | |
c617c0c6 | 3762 | struct lttng_event_field *tmp_event; |
f37d259d MD |
3763 | |
3764 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
3765 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
3766 | if (tmp_event == NULL) { | |
f37d259d MD |
3767 | PERROR("zmalloc ust app event fields"); |
3768 | ret = -ENOMEM; | |
3769 | goto error; | |
3770 | } | |
3771 | ||
3772 | rcu_read_lock(); | |
3773 | ||
3774 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3775 | struct lttng_ust_field_iter uiter; | |
3776 | ||
840cb59c | 3777 | health_code_update(); |
86acf0da | 3778 | |
f37d259d MD |
3779 | if (!app->compatible) { |
3780 | /* | |
3781 | * TODO: In time, we should notice the caller of this error by | |
3782 | * telling him that this is a version error. | |
3783 | */ | |
3784 | continue; | |
3785 | } | |
fb45065e | 3786 | pthread_mutex_lock(&app->sock_lock); |
f37d259d MD |
3787 | handle = ustctl_tracepoint_field_list(app->sock); |
3788 | if (handle < 0) { | |
ffe60014 DG |
3789 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3790 | ERR("UST app list field getting handle failed for app pid %d", | |
3791 | app->pid); | |
3792 | } | |
fb45065e | 3793 | pthread_mutex_unlock(&app->sock_lock); |
f37d259d MD |
3794 | continue; |
3795 | } | |
3796 | ||
3797 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 3798 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3799 | /* Handle ustctl error. */ |
3800 | if (ret < 0) { | |
fb45065e MD |
3801 | int release_ret; |
3802 | ||
a2ba1ab0 | 3803 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3804 | ERR("UST app tp list field failed for app %d with ret %d", |
3805 | app->sock, ret); | |
3806 | } else { | |
3807 | DBG3("UST app tp list field failed. Application is dead"); | |
3757b385 DG |
3808 | /* |
3809 | * This is normal behavior, an application can die during the | |
3810 | * creation process. Don't report an error so the execution can | |
98f595d4 | 3811 | * continue normally. Reset list and count for next app. |
3757b385 DG |
3812 | */ |
3813 | break; | |
ffe60014 | 3814 | } |
98f595d4 | 3815 | free(tmp_event); |
fb45065e MD |
3816 | release_ret = ustctl_release_handle(app->sock, handle); |
3817 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
3818 | if (release_ret < 0 && |
3819 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3820 | release_ret != -EPIPE) { | |
fb45065e MD |
3821 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3822 | } | |
ffe60014 DG |
3823 | goto rcu_error; |
3824 | } | |
3825 | ||
840cb59c | 3826 | health_code_update(); |
f37d259d | 3827 | if (count >= nbmem) { |
d7b3776f | 3828 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3829 | struct lttng_event_field *new_tmp_event; |
3830 | size_t new_nbmem; | |
3831 | ||
3832 | new_nbmem = nbmem << 1; | |
3833 | DBG2("Reallocating event field list from %zu to %zu entries", | |
3834 | nbmem, new_nbmem); | |
3835 | new_tmp_event = realloc(tmp_event, | |
3836 | new_nbmem * sizeof(struct lttng_event_field)); | |
3837 | if (new_tmp_event == NULL) { | |
fb45065e MD |
3838 | int release_ret; |
3839 | ||
f37d259d | 3840 | PERROR("realloc ust app event fields"); |
c617c0c6 | 3841 | free(tmp_event); |
f37d259d | 3842 | ret = -ENOMEM; |
fb45065e MD |
3843 | release_ret = ustctl_release_handle(app->sock, handle); |
3844 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
3845 | if (release_ret && |
3846 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3847 | release_ret != -EPIPE) { | |
fb45065e MD |
3848 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3849 | } | |
f37d259d MD |
3850 | goto rcu_error; |
3851 | } | |
53efb85a MD |
3852 | /* Zero the new memory */ |
3853 | memset(new_tmp_event + nbmem, 0, | |
3854 | (new_nbmem - nbmem) * sizeof(struct lttng_event_field)); | |
3855 | nbmem = new_nbmem; | |
3856 | tmp_event = new_tmp_event; | |
f37d259d | 3857 | } |
f37d259d | 3858 | |
c617c0c6 | 3859 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
2e84128e DG |
3860 | /* Mapping between these enums matches 1 to 1. */ |
3861 | tmp_event[count].type = (enum lttng_event_field_type) uiter.type; | |
c617c0c6 | 3862 | tmp_event[count].nowrite = uiter.nowrite; |
f37d259d | 3863 | |
c617c0c6 MD |
3864 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
3865 | tmp_event[count].event.loglevel = uiter.loglevel; | |
2e84128e | 3866 | tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; |
c617c0c6 MD |
3867 | tmp_event[count].event.pid = app->pid; |
3868 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
3869 | count++; |
3870 | } | |
fb45065e MD |
3871 | ret = ustctl_release_handle(app->sock, handle); |
3872 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
3873 | if (ret < 0 && |
3874 | ret != -LTTNG_UST_ERR_EXITING && | |
3875 | ret != -EPIPE) { | |
fb45065e MD |
3876 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
3877 | } | |
f37d259d MD |
3878 | } |
3879 | ||
3880 | ret = count; | |
c617c0c6 | 3881 | *fields = tmp_event; |
f37d259d MD |
3882 | |
3883 | DBG2("UST app list event fields done (%zu events)", count); | |
3884 | ||
3885 | rcu_error: | |
3886 | rcu_read_unlock(); | |
3887 | error: | |
840cb59c | 3888 | health_code_update(); |
f37d259d MD |
3889 | return ret; |
3890 | } | |
3891 | ||
5b4a0ec0 DG |
3892 | /* |
3893 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
3894 | * |
3895 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
3896 | */ |
3897 | void ust_app_clean_list(void) | |
421cb601 | 3898 | { |
5b4a0ec0 | 3899 | int ret; |
659ed79f | 3900 | struct ust_app *app; |
bec39940 | 3901 | struct lttng_ht_iter iter; |
421cb601 | 3902 | |
5b4a0ec0 | 3903 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3904 | |
5b4a0ec0 | 3905 | rcu_read_lock(); |
421cb601 | 3906 | |
f1b711c4 MD |
3907 | if (ust_app_ht) { |
3908 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3909 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3910 | assert(!ret); | |
3911 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
3912 | } | |
421cb601 DG |
3913 | } |
3914 | ||
852d0037 | 3915 | /* Cleanup socket hash table */ |
f1b711c4 MD |
3916 | if (ust_app_ht_by_sock) { |
3917 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, | |
3918 | sock_n.node) { | |
3919 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); | |
3920 | assert(!ret); | |
3921 | } | |
bec39940 | 3922 | } |
852d0037 | 3923 | |
d88aee68 | 3924 | /* Cleanup notify socket hash table */ |
f1b711c4 MD |
3925 | if (ust_app_ht_by_notify_sock) { |
3926 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3927 | notify_sock_n.node) { | |
3928 | ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3929 | assert(!ret); | |
3930 | } | |
d88aee68 | 3931 | } |
36b588ed | 3932 | rcu_read_unlock(); |
d88aee68 | 3933 | |
bec39940 | 3934 | /* Destroy is done only when the ht is empty */ |
f1b711c4 MD |
3935 | if (ust_app_ht) { |
3936 | ht_cleanup_push(ust_app_ht); | |
3937 | } | |
3938 | if (ust_app_ht_by_sock) { | |
3939 | ht_cleanup_push(ust_app_ht_by_sock); | |
3940 | } | |
3941 | if (ust_app_ht_by_notify_sock) { | |
3942 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
3943 | } | |
5b4a0ec0 DG |
3944 | } |
3945 | ||
3946 | /* | |
3947 | * Init UST app hash table. | |
3948 | */ | |
57703f6e | 3949 | int ust_app_ht_alloc(void) |
5b4a0ec0 | 3950 | { |
bec39940 | 3951 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3952 | if (!ust_app_ht) { |
3953 | return -1; | |
3954 | } | |
852d0037 | 3955 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3956 | if (!ust_app_ht_by_sock) { |
3957 | return -1; | |
3958 | } | |
d0b96690 | 3959 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3960 | if (!ust_app_ht_by_notify_sock) { |
3961 | return -1; | |
3962 | } | |
3963 | return 0; | |
421cb601 DG |
3964 | } |
3965 | ||
78f0bacd DG |
3966 | /* |
3967 | * For a specific UST session, disable the channel for all registered apps. | |
3968 | */ | |
35a9059d | 3969 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3970 | struct ltt_ust_channel *uchan) |
3971 | { | |
3972 | int ret = 0; | |
bec39940 DG |
3973 | struct lttng_ht_iter iter; |
3974 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3975 | struct ust_app *app; |
3976 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3977 | struct ust_app_channel *ua_chan; |
78f0bacd DG |
3978 | |
3979 | if (usess == NULL || uchan == NULL) { | |
3980 | ERR("Disabling UST global channel with NULL values"); | |
3981 | ret = -1; | |
3982 | goto error; | |
3983 | } | |
3984 | ||
d9bf3ca4 | 3985 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 3986 | uchan->name, usess->id); |
78f0bacd DG |
3987 | |
3988 | rcu_read_lock(); | |
3989 | ||
3990 | /* For every registered applications */ | |
852d0037 | 3991 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3992 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3993 | if (!app->compatible) { |
3994 | /* | |
3995 | * TODO: In time, we should notice the caller of this error by | |
3996 | * telling him that this is a version error. | |
3997 | */ | |
3998 | continue; | |
3999 | } | |
78f0bacd DG |
4000 | ua_sess = lookup_session_by_app(usess, app); |
4001 | if (ua_sess == NULL) { | |
4002 | continue; | |
4003 | } | |
4004 | ||
8535a6d9 | 4005 | /* Get channel */ |
bec39940 DG |
4006 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4007 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
4008 | /* If the session if found for the app, the channel must be there */ |
4009 | assert(ua_chan_node); | |
4010 | ||
4011 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4012 | /* The channel must not be already disabled */ | |
4013 | assert(ua_chan->enabled == 1); | |
4014 | ||
4015 | /* Disable channel onto application */ | |
4016 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
4017 | if (ret < 0) { |
4018 | /* XXX: We might want to report this error at some point... */ | |
4019 | continue; | |
4020 | } | |
4021 | } | |
4022 | ||
4023 | rcu_read_unlock(); | |
4024 | ||
4025 | error: | |
4026 | return ret; | |
4027 | } | |
4028 | ||
4029 | /* | |
4030 | * For a specific UST session, enable the channel for all registered apps. | |
4031 | */ | |
35a9059d | 4032 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
4033 | struct ltt_ust_channel *uchan) |
4034 | { | |
4035 | int ret = 0; | |
bec39940 | 4036 | struct lttng_ht_iter iter; |
78f0bacd DG |
4037 | struct ust_app *app; |
4038 | struct ust_app_session *ua_sess; | |
4039 | ||
4040 | if (usess == NULL || uchan == NULL) { | |
4041 | ERR("Adding UST global channel to NULL values"); | |
4042 | ret = -1; | |
4043 | goto error; | |
4044 | } | |
4045 | ||
d9bf3ca4 | 4046 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 4047 | uchan->name, usess->id); |
78f0bacd DG |
4048 | |
4049 | rcu_read_lock(); | |
4050 | ||
4051 | /* For every registered applications */ | |
852d0037 | 4052 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4053 | if (!app->compatible) { |
4054 | /* | |
4055 | * TODO: In time, we should notice the caller of this error by | |
4056 | * telling him that this is a version error. | |
4057 | */ | |
4058 | continue; | |
4059 | } | |
78f0bacd DG |
4060 | ua_sess = lookup_session_by_app(usess, app); |
4061 | if (ua_sess == NULL) { | |
4062 | continue; | |
4063 | } | |
4064 | ||
4065 | /* Enable channel onto application */ | |
4066 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
4067 | if (ret < 0) { | |
4068 | /* XXX: We might want to report this error at some point... */ | |
4069 | continue; | |
4070 | } | |
4071 | } | |
4072 | ||
4073 | rcu_read_unlock(); | |
4074 | ||
4075 | error: | |
4076 | return ret; | |
4077 | } | |
4078 | ||
b0a40d28 DG |
4079 | /* |
4080 | * Disable an event in a channel and for a specific session. | |
4081 | */ | |
35a9059d DG |
4082 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
4083 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
4084 | { |
4085 | int ret = 0; | |
bec39940 | 4086 | struct lttng_ht_iter iter, uiter; |
700c5a9d | 4087 | struct lttng_ht_node_str *ua_chan_node; |
b0a40d28 DG |
4088 | struct ust_app *app; |
4089 | struct ust_app_session *ua_sess; | |
4090 | struct ust_app_channel *ua_chan; | |
4091 | struct ust_app_event *ua_event; | |
4092 | ||
4093 | DBG("UST app disabling event %s for all apps in channel " | |
d9bf3ca4 MD |
4094 | "%s for session id %" PRIu64, |
4095 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
4096 | |
4097 | rcu_read_lock(); | |
4098 | ||
4099 | /* For all registered applications */ | |
852d0037 | 4100 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4101 | if (!app->compatible) { |
4102 | /* | |
4103 | * TODO: In time, we should notice the caller of this error by | |
4104 | * telling him that this is a version error. | |
4105 | */ | |
4106 | continue; | |
4107 | } | |
b0a40d28 DG |
4108 | ua_sess = lookup_session_by_app(usess, app); |
4109 | if (ua_sess == NULL) { | |
4110 | /* Next app */ | |
4111 | continue; | |
4112 | } | |
4113 | ||
4114 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
4115 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4116 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 4117 | if (ua_chan_node == NULL) { |
d9bf3ca4 | 4118 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 4119 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
4120 | continue; |
4121 | } | |
4122 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4123 | ||
700c5a9d JR |
4124 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
4125 | uevent->filter, uevent->attr.loglevel, | |
4126 | uevent->exclusion); | |
4127 | if (ua_event == NULL) { | |
b0a40d28 | 4128 | DBG2("Event %s not found in channel %s for app pid %d." |
852d0037 | 4129 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
4130 | continue; |
4131 | } | |
b0a40d28 | 4132 | |
7f79d3a1 | 4133 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
4134 | if (ret < 0) { |
4135 | /* XXX: Report error someday... */ | |
4136 | continue; | |
4137 | } | |
4138 | } | |
4139 | ||
4140 | rcu_read_unlock(); | |
4141 | ||
4142 | return ret; | |
4143 | } | |
4144 | ||
421cb601 | 4145 | /* |
5b4a0ec0 | 4146 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 4147 | */ |
35a9059d | 4148 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
4149 | struct ltt_ust_channel *uchan) |
4150 | { | |
3d8ca23b | 4151 | int ret = 0, created; |
bec39940 | 4152 | struct lttng_ht_iter iter; |
48842b30 | 4153 | struct ust_app *app; |
3d8ca23b | 4154 | struct ust_app_session *ua_sess = NULL; |
48842b30 | 4155 | |
fc34caaa DG |
4156 | /* Very wrong code flow */ |
4157 | assert(usess); | |
4158 | assert(uchan); | |
421cb601 | 4159 | |
d9bf3ca4 | 4160 | DBG2("UST app adding channel %s to UST domain for session id %" PRIu64, |
a991f516 | 4161 | uchan->name, usess->id); |
48842b30 DG |
4162 | |
4163 | rcu_read_lock(); | |
421cb601 | 4164 | |
5b4a0ec0 | 4165 | /* For every registered applications */ |
852d0037 | 4166 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4167 | if (!app->compatible) { |
4168 | /* | |
4169 | * TODO: In time, we should notice the caller of this error by | |
4170 | * telling him that this is a version error. | |
4171 | */ | |
4172 | continue; | |
4173 | } | |
a9ad0c8f MD |
4174 | if (!trace_ust_pid_tracker_lookup(usess, app->pid)) { |
4175 | /* Skip. */ | |
4176 | continue; | |
4177 | } | |
4178 | ||
edb67388 DG |
4179 | /* |
4180 | * Create session on the tracer side and add it to app session HT. Note | |
4181 | * that if session exist, it will simply return a pointer to the ust | |
4182 | * app session. | |
4183 | */ | |
03f91eaa | 4184 | ret = find_or_create_ust_app_session(usess, app, &ua_sess, &created); |
3d8ca23b DG |
4185 | if (ret < 0) { |
4186 | switch (ret) { | |
4187 | case -ENOTCONN: | |
4188 | /* | |
4189 | * The application's socket is not valid. Either a bad socket | |
4190 | * or a timeout on it. We can't inform the caller that for a | |
4191 | * specific app, the session failed so lets continue here. | |
4192 | */ | |
a7169585 | 4193 | ret = 0; /* Not an error. */ |
3d8ca23b DG |
4194 | continue; |
4195 | case -ENOMEM: | |
4196 | default: | |
4197 | goto error_rcu_unlock; | |
4198 | } | |
48842b30 | 4199 | } |
3d8ca23b | 4200 | assert(ua_sess); |
48842b30 | 4201 | |
d0b96690 | 4202 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
4203 | |
4204 | if (ua_sess->deleted) { | |
4205 | pthread_mutex_unlock(&ua_sess->lock); | |
4206 | continue; | |
4207 | } | |
4208 | ||
d65d2de8 DG |
4209 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, |
4210 | sizeof(uchan->name))) { | |
ad7a9107 DG |
4211 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, &uchan->attr); |
4212 | ret = 0; | |
d65d2de8 DG |
4213 | } else { |
4214 | /* Create channel onto application. We don't need the chan ref. */ | |
4215 | ret = create_ust_app_channel(ua_sess, uchan, app, | |
4216 | LTTNG_UST_CHAN_PER_CPU, usess, NULL); | |
4217 | } | |
d0b96690 | 4218 | pthread_mutex_unlock(&ua_sess->lock); |
3d8ca23b | 4219 | if (ret < 0) { |
3d8ca23b DG |
4220 | /* Cleanup the created session if it's the case. */ |
4221 | if (created) { | |
d0b96690 | 4222 | destroy_app_session(app, ua_sess); |
3d8ca23b | 4223 | } |
a7169585 MD |
4224 | switch (ret) { |
4225 | case -ENOTCONN: | |
4226 | /* | |
4227 | * The application's socket is not valid. Either a bad socket | |
4228 | * or a timeout on it. We can't inform the caller that for a | |
4229 | * specific app, the session failed so lets continue here. | |
4230 | */ | |
4231 | ret = 0; /* Not an error. */ | |
4232 | continue; | |
4233 | case -ENOMEM: | |
4234 | default: | |
4235 | goto error_rcu_unlock; | |
4236 | } | |
48842b30 | 4237 | } |
48842b30 | 4238 | } |
5b4a0ec0 | 4239 | |
95e047ff | 4240 | error_rcu_unlock: |
48842b30 | 4241 | rcu_read_unlock(); |
3c14c33f | 4242 | return ret; |
48842b30 DG |
4243 | } |
4244 | ||
5b4a0ec0 | 4245 | /* |
edb67388 | 4246 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 4247 | */ |
35a9059d | 4248 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
4249 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4250 | { | |
4251 | int ret = 0; | |
bec39940 | 4252 | struct lttng_ht_iter iter, uiter; |
18eace3b | 4253 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
4254 | struct ust_app *app; |
4255 | struct ust_app_session *ua_sess; | |
4256 | struct ust_app_channel *ua_chan; | |
4257 | struct ust_app_event *ua_event; | |
48842b30 | 4258 | |
d9bf3ca4 | 4259 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 4260 | uevent->attr.name, usess->id); |
48842b30 | 4261 | |
edb67388 DG |
4262 | /* |
4263 | * NOTE: At this point, this function is called only if the session and | |
4264 | * channel passed are already created for all apps. and enabled on the | |
4265 | * tracer also. | |
4266 | */ | |
4267 | ||
48842b30 | 4268 | rcu_read_lock(); |
421cb601 DG |
4269 | |
4270 | /* For all registered applications */ | |
852d0037 | 4271 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4272 | if (!app->compatible) { |
4273 | /* | |
4274 | * TODO: In time, we should notice the caller of this error by | |
4275 | * telling him that this is a version error. | |
4276 | */ | |
4277 | continue; | |
4278 | } | |
edb67388 | 4279 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4280 | if (!ua_sess) { |
4281 | /* The application has problem or is probably dead. */ | |
4282 | continue; | |
4283 | } | |
ba767faf | 4284 | |
d0b96690 DG |
4285 | pthread_mutex_lock(&ua_sess->lock); |
4286 | ||
b161602a MD |
4287 | if (ua_sess->deleted) { |
4288 | pthread_mutex_unlock(&ua_sess->lock); | |
4289 | continue; | |
4290 | } | |
4291 | ||
edb67388 | 4292 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4293 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4294 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
a7169585 MD |
4295 | /* |
4296 | * It is possible that the channel cannot be found is | |
4297 | * the channel/event creation occurs concurrently with | |
4298 | * an application exit. | |
4299 | */ | |
4300 | if (!ua_chan_node) { | |
4301 | pthread_mutex_unlock(&ua_sess->lock); | |
4302 | continue; | |
4303 | } | |
edb67388 DG |
4304 | |
4305 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4306 | ||
18eace3b DG |
4307 | /* Get event node */ |
4308 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
39c5a3a7 | 4309 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 4310 | if (ua_event == NULL) { |
7f79d3a1 | 4311 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 4312 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 4313 | goto next_app; |
35a9059d | 4314 | } |
35a9059d DG |
4315 | |
4316 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
4317 | if (ret < 0) { | |
d0b96690 | 4318 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 4319 | goto error; |
48842b30 | 4320 | } |
d0b96690 DG |
4321 | next_app: |
4322 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
4323 | } |
4324 | ||
7f79d3a1 | 4325 | error: |
edb67388 | 4326 | rcu_read_unlock(); |
edb67388 DG |
4327 | return ret; |
4328 | } | |
4329 | ||
4330 | /* | |
4331 | * For a specific existing UST session and UST channel, creates the event for | |
4332 | * all registered apps. | |
4333 | */ | |
35a9059d | 4334 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
4335 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4336 | { | |
4337 | int ret = 0; | |
bec39940 DG |
4338 | struct lttng_ht_iter iter, uiter; |
4339 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
4340 | struct ust_app *app; |
4341 | struct ust_app_session *ua_sess; | |
4342 | struct ust_app_channel *ua_chan; | |
4343 | ||
d9bf3ca4 | 4344 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 4345 | uevent->attr.name, usess->id); |
edb67388 | 4346 | |
edb67388 DG |
4347 | rcu_read_lock(); |
4348 | ||
4349 | /* For all registered applications */ | |
852d0037 | 4350 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4351 | if (!app->compatible) { |
4352 | /* | |
4353 | * TODO: In time, we should notice the caller of this error by | |
4354 | * telling him that this is a version error. | |
4355 | */ | |
4356 | continue; | |
4357 | } | |
edb67388 | 4358 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4359 | if (!ua_sess) { |
4360 | /* The application has problem or is probably dead. */ | |
4361 | continue; | |
4362 | } | |
48842b30 | 4363 | |
d0b96690 | 4364 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
4365 | |
4366 | if (ua_sess->deleted) { | |
4367 | pthread_mutex_unlock(&ua_sess->lock); | |
4368 | continue; | |
4369 | } | |
4370 | ||
48842b30 | 4371 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4372 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4373 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
4374 | /* If the channel is not found, there is a code flow error */ |
4375 | assert(ua_chan_node); | |
4376 | ||
48842b30 DG |
4377 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
4378 | ||
edb67388 | 4379 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 4380 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 4381 | if (ret < 0) { |
49c336c1 | 4382 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
4383 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
4384 | break; | |
4385 | } | |
4386 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 4387 | uevent->attr.name, app->pid); |
5b4a0ec0 | 4388 | continue; |
48842b30 | 4389 | } |
48842b30 | 4390 | } |
5b4a0ec0 | 4391 | |
48842b30 DG |
4392 | rcu_read_unlock(); |
4393 | ||
4394 | return ret; | |
4395 | } | |
4396 | ||
5b4a0ec0 DG |
4397 | /* |
4398 | * Start tracing for a specific UST session and app. | |
fad1ed2f JR |
4399 | * |
4400 | * Called with UST app session lock held. | |
4401 | * | |
5b4a0ec0 | 4402 | */ |
b34cbebf | 4403 | static |
421cb601 | 4404 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
4405 | { |
4406 | int ret = 0; | |
48842b30 | 4407 | struct ust_app_session *ua_sess; |
48842b30 | 4408 | |
852d0037 | 4409 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 4410 | |
509cbaf8 MD |
4411 | rcu_read_lock(); |
4412 | ||
e0c7ec2b DG |
4413 | if (!app->compatible) { |
4414 | goto end; | |
4415 | } | |
4416 | ||
421cb601 DG |
4417 | ua_sess = lookup_session_by_app(usess, app); |
4418 | if (ua_sess == NULL) { | |
d42f20df DG |
4419 | /* The session is in teardown process. Ignore and continue. */ |
4420 | goto end; | |
421cb601 | 4421 | } |
48842b30 | 4422 | |
d0b96690 DG |
4423 | pthread_mutex_lock(&ua_sess->lock); |
4424 | ||
b161602a MD |
4425 | if (ua_sess->deleted) { |
4426 | pthread_mutex_unlock(&ua_sess->lock); | |
4427 | goto end; | |
4428 | } | |
4429 | ||
aea829b3 DG |
4430 | /* Upon restart, we skip the setup, already done */ |
4431 | if (ua_sess->started) { | |
8be98f9a | 4432 | goto skip_setup; |
aea829b3 | 4433 | } |
8be98f9a | 4434 | |
a4b92340 DG |
4435 | /* Create directories if consumer is LOCAL and has a path defined. */ |
4436 | if (usess->consumer->type == CONSUMER_DST_LOCAL && | |
366a9222 JD |
4437 | usess->consumer->dst.session_root_path[0] != '\0') { |
4438 | char *tmp_path; | |
4439 | ||
61ba6b6d | 4440 | tmp_path = zmalloc(LTTNG_PATH_MAX); |
366a9222 JD |
4441 | if (!tmp_path) { |
4442 | ERR("Alloc tmp_path"); | |
4443 | goto error_unlock; | |
4444 | } | |
61ba6b6d | 4445 | ret = snprintf(tmp_path, LTTNG_PATH_MAX, "%s%s%s", |
366a9222 JD |
4446 | usess->consumer->dst.session_root_path, |
4447 | usess->consumer->chunk_path, | |
4448 | usess->consumer->subdir); | |
61ba6b6d | 4449 | if (ret >= LTTNG_PATH_MAX) { |
366a9222 | 4450 | ERR("Local destination path exceeds the maximal allowed length of %i bytes (needs %i bytes) with path = \"%s%s%s\"", |
61ba6b6d | 4451 | LTTNG_PATH_MAX, ret, |
366a9222 JD |
4452 | usess->consumer->dst.session_root_path, |
4453 | usess->consumer->chunk_path, | |
4454 | usess->consumer->subdir); | |
a0fda194 | 4455 | free(tmp_path); |
366a9222 JD |
4456 | goto error_unlock; |
4457 | } | |
4458 | ||
4459 | DBG("Creating directory path for local tracing: \"%s\"", | |
4460 | tmp_path); | |
4461 | ret = run_as_mkdir_recursive(tmp_path, S_IRWXU | S_IRWXG, | |
4462 | ua_sess->euid, ua_sess->egid); | |
4463 | free(tmp_path); | |
a4b92340 | 4464 | if (ret < 0) { |
df5b86c8 | 4465 | if (errno != EEXIST) { |
a4b92340 | 4466 | ERR("Trace directory creation error"); |
d0b96690 | 4467 | goto error_unlock; |
421cb601 | 4468 | } |
173af62f | 4469 | } |
7753dea8 | 4470 | } |
aea829b3 | 4471 | |
d65d2de8 DG |
4472 | /* |
4473 | * Create the metadata for the application. This returns gracefully if a | |
4474 | * metadata was already set for the session. | |
4475 | */ | |
ad7a9107 | 4476 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer); |
421cb601 | 4477 | if (ret < 0) { |
d0b96690 | 4478 | goto error_unlock; |
421cb601 | 4479 | } |
48842b30 | 4480 | |
840cb59c | 4481 | health_code_update(); |
86acf0da | 4482 | |
8be98f9a | 4483 | skip_setup: |
421cb601 | 4484 | /* This start the UST tracing */ |
fb45065e | 4485 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4486 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
fb45065e | 4487 | pthread_mutex_unlock(&app->sock_lock); |
421cb601 | 4488 | if (ret < 0) { |
ffe60014 DG |
4489 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4490 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
4491 | app->pid, ret); | |
4492 | } else { | |
4493 | DBG("UST app start session failed. Application is dead."); | |
3757b385 DG |
4494 | /* |
4495 | * This is normal behavior, an application can die during the | |
4496 | * creation process. Don't report an error so the execution can | |
4497 | * continue normally. | |
4498 | */ | |
4499 | pthread_mutex_unlock(&ua_sess->lock); | |
4500 | goto end; | |
ffe60014 | 4501 | } |
d0b96690 | 4502 | goto error_unlock; |
421cb601 | 4503 | } |
5b4a0ec0 | 4504 | |
55c3953d DG |
4505 | /* Indicate that the session has been started once */ |
4506 | ua_sess->started = 1; | |
4507 | ||
d0b96690 DG |
4508 | pthread_mutex_unlock(&ua_sess->lock); |
4509 | ||
840cb59c | 4510 | health_code_update(); |
86acf0da | 4511 | |
421cb601 | 4512 | /* Quiescent wait after starting trace */ |
fb45065e | 4513 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4514 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4515 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4516 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4517 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4518 | app->pid, ret); | |
4519 | } | |
48842b30 | 4520 | |
e0c7ec2b DG |
4521 | end: |
4522 | rcu_read_unlock(); | |
840cb59c | 4523 | health_code_update(); |
421cb601 | 4524 | return 0; |
48842b30 | 4525 | |
d0b96690 DG |
4526 | error_unlock: |
4527 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 4528 | rcu_read_unlock(); |
840cb59c | 4529 | health_code_update(); |
421cb601 DG |
4530 | return -1; |
4531 | } | |
48842b30 | 4532 | |
8be98f9a MD |
4533 | /* |
4534 | * Stop tracing for a specific UST session and app. | |
4535 | */ | |
b34cbebf | 4536 | static |
8be98f9a MD |
4537 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
4538 | { | |
4539 | int ret = 0; | |
4540 | struct ust_app_session *ua_sess; | |
7972aab2 | 4541 | struct ust_registry_session *registry; |
8be98f9a | 4542 | |
852d0037 | 4543 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
4544 | |
4545 | rcu_read_lock(); | |
4546 | ||
e0c7ec2b | 4547 | if (!app->compatible) { |
d88aee68 | 4548 | goto end_no_session; |
e0c7ec2b DG |
4549 | } |
4550 | ||
8be98f9a MD |
4551 | ua_sess = lookup_session_by_app(usess, app); |
4552 | if (ua_sess == NULL) { | |
d88aee68 | 4553 | goto end_no_session; |
8be98f9a MD |
4554 | } |
4555 | ||
d88aee68 DG |
4556 | pthread_mutex_lock(&ua_sess->lock); |
4557 | ||
b161602a MD |
4558 | if (ua_sess->deleted) { |
4559 | pthread_mutex_unlock(&ua_sess->lock); | |
4560 | goto end_no_session; | |
4561 | } | |
4562 | ||
9bc07046 DG |
4563 | /* |
4564 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
4565 | * that was never started. It's possible since we can have a fail start |
4566 | * from either the application manager thread or the command thread. Simply | |
4567 | * indicate that this is a stop error. | |
9bc07046 | 4568 | */ |
f9dfc3d9 | 4569 | if (!ua_sess->started) { |
c45536e1 DG |
4570 | goto error_rcu_unlock; |
4571 | } | |
7db205b5 | 4572 | |
840cb59c | 4573 | health_code_update(); |
86acf0da | 4574 | |
9d6c7d3f | 4575 | /* This inhibits UST tracing */ |
fb45065e | 4576 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4577 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
fb45065e | 4578 | pthread_mutex_unlock(&app->sock_lock); |
9d6c7d3f | 4579 | if (ret < 0) { |
ffe60014 DG |
4580 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4581 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
4582 | app->pid, ret); | |
4583 | } else { | |
4584 | DBG("UST app stop session failed. Application is dead."); | |
3757b385 DG |
4585 | /* |
4586 | * This is normal behavior, an application can die during the | |
4587 | * creation process. Don't report an error so the execution can | |
4588 | * continue normally. | |
4589 | */ | |
4590 | goto end_unlock; | |
ffe60014 | 4591 | } |
9d6c7d3f DG |
4592 | goto error_rcu_unlock; |
4593 | } | |
4594 | ||
840cb59c | 4595 | health_code_update(); |
86acf0da | 4596 | |
9d6c7d3f | 4597 | /* Quiescent wait after stopping trace */ |
fb45065e | 4598 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4599 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4600 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4601 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4602 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4603 | app->pid, ret); | |
4604 | } | |
9d6c7d3f | 4605 | |
840cb59c | 4606 | health_code_update(); |
86acf0da | 4607 | |
b34cbebf | 4608 | registry = get_session_registry(ua_sess); |
fad1ed2f JR |
4609 | |
4610 | /* The UST app session is held registry shall not be null. */ | |
b34cbebf | 4611 | assert(registry); |
1b532a60 | 4612 | |
ce34fcd0 MD |
4613 | /* Push metadata for application before freeing the application. */ |
4614 | (void) push_metadata(registry, ua_sess->consumer); | |
b34cbebf | 4615 | |
3757b385 | 4616 | end_unlock: |
b34cbebf MD |
4617 | pthread_mutex_unlock(&ua_sess->lock); |
4618 | end_no_session: | |
4619 | rcu_read_unlock(); | |
4620 | health_code_update(); | |
4621 | return 0; | |
4622 | ||
4623 | error_rcu_unlock: | |
4624 | pthread_mutex_unlock(&ua_sess->lock); | |
4625 | rcu_read_unlock(); | |
4626 | health_code_update(); | |
4627 | return -1; | |
4628 | } | |
4629 | ||
b34cbebf | 4630 | static |
c4b88406 MD |
4631 | int ust_app_flush_app_session(struct ust_app *app, |
4632 | struct ust_app_session *ua_sess) | |
b34cbebf | 4633 | { |
c4b88406 | 4634 | int ret, retval = 0; |
b34cbebf | 4635 | struct lttng_ht_iter iter; |
b34cbebf | 4636 | struct ust_app_channel *ua_chan; |
c4b88406 | 4637 | struct consumer_socket *socket; |
b34cbebf | 4638 | |
c4b88406 | 4639 | DBG("Flushing app session buffers for ust app pid %d", app->pid); |
b34cbebf MD |
4640 | |
4641 | rcu_read_lock(); | |
4642 | ||
4643 | if (!app->compatible) { | |
c4b88406 | 4644 | goto end_not_compatible; |
b34cbebf MD |
4645 | } |
4646 | ||
4647 | pthread_mutex_lock(&ua_sess->lock); | |
4648 | ||
b161602a MD |
4649 | if (ua_sess->deleted) { |
4650 | goto end_deleted; | |
4651 | } | |
4652 | ||
b34cbebf MD |
4653 | health_code_update(); |
4654 | ||
9d6c7d3f | 4655 | /* Flushing buffers */ |
c4b88406 MD |
4656 | socket = consumer_find_socket_by_bitness(app->bits_per_long, |
4657 | ua_sess->consumer); | |
ce34fcd0 MD |
4658 | |
4659 | /* Flush buffers and push metadata. */ | |
4660 | switch (ua_sess->buffer_type) { | |
4661 | case LTTNG_BUFFER_PER_PID: | |
4662 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, | |
4663 | node.node) { | |
4664 | health_code_update(); | |
ce34fcd0 MD |
4665 | ret = consumer_flush_channel(socket, ua_chan->key); |
4666 | if (ret) { | |
4667 | ERR("Error flushing consumer channel"); | |
4668 | retval = -1; | |
4669 | continue; | |
4670 | } | |
8be98f9a | 4671 | } |
ce34fcd0 MD |
4672 | break; |
4673 | case LTTNG_BUFFER_PER_UID: | |
4674 | default: | |
4675 | assert(0); | |
4676 | break; | |
8be98f9a | 4677 | } |
8be98f9a | 4678 | |
840cb59c | 4679 | health_code_update(); |
86acf0da | 4680 | |
b161602a | 4681 | end_deleted: |
d88aee68 | 4682 | pthread_mutex_unlock(&ua_sess->lock); |
ce34fcd0 | 4683 | |
c4b88406 MD |
4684 | end_not_compatible: |
4685 | rcu_read_unlock(); | |
4686 | health_code_update(); | |
4687 | return retval; | |
4688 | } | |
4689 | ||
4690 | /* | |
ce34fcd0 MD |
4691 | * Flush buffers for all applications for a specific UST session. |
4692 | * Called with UST session lock held. | |
c4b88406 MD |
4693 | */ |
4694 | static | |
ce34fcd0 | 4695 | int ust_app_flush_session(struct ltt_ust_session *usess) |
c4b88406 MD |
4696 | |
4697 | { | |
99b1411c | 4698 | int ret = 0; |
c4b88406 | 4699 | |
ce34fcd0 | 4700 | DBG("Flushing session buffers for all ust apps"); |
c4b88406 MD |
4701 | |
4702 | rcu_read_lock(); | |
4703 | ||
ce34fcd0 MD |
4704 | /* Flush buffers and push metadata. */ |
4705 | switch (usess->buffer_type) { | |
4706 | case LTTNG_BUFFER_PER_UID: | |
4707 | { | |
4708 | struct buffer_reg_uid *reg; | |
4709 | struct lttng_ht_iter iter; | |
4710 | ||
4711 | /* Flush all per UID buffers associated to that session. */ | |
4712 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
4713 | struct ust_registry_session *ust_session_reg; | |
4714 | struct buffer_reg_channel *reg_chan; | |
4715 | struct consumer_socket *socket; | |
4716 | ||
4717 | /* Get consumer socket to use to push the metadata.*/ | |
4718 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
4719 | usess->consumer); | |
4720 | if (!socket) { | |
4721 | /* Ignore request if no consumer is found for the session. */ | |
4722 | continue; | |
4723 | } | |
4724 | ||
4725 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
4726 | reg_chan, node.node) { | |
4727 | /* | |
4728 | * The following call will print error values so the return | |
4729 | * code is of little importance because whatever happens, we | |
4730 | * have to try them all. | |
4731 | */ | |
4732 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
4733 | } | |
4734 | ||
4735 | ust_session_reg = reg->registry->reg.ust; | |
4736 | /* Push metadata. */ | |
4737 | (void) push_metadata(ust_session_reg, usess->consumer); | |
4738 | } | |
ce34fcd0 MD |
4739 | break; |
4740 | } | |
4741 | case LTTNG_BUFFER_PER_PID: | |
4742 | { | |
4743 | struct ust_app_session *ua_sess; | |
4744 | struct lttng_ht_iter iter; | |
4745 | struct ust_app *app; | |
4746 | ||
4747 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4748 | ua_sess = lookup_session_by_app(usess, app); | |
4749 | if (ua_sess == NULL) { | |
4750 | continue; | |
4751 | } | |
4752 | (void) ust_app_flush_app_session(app, ua_sess); | |
4753 | } | |
4754 | break; | |
4755 | } | |
4756 | default: | |
99b1411c | 4757 | ret = -1; |
ce34fcd0 MD |
4758 | assert(0); |
4759 | break; | |
c4b88406 | 4760 | } |
c4b88406 | 4761 | |
7db205b5 | 4762 | rcu_read_unlock(); |
840cb59c | 4763 | health_code_update(); |
c4b88406 | 4764 | return ret; |
8be98f9a MD |
4765 | } |
4766 | ||
0dd01979 MD |
4767 | static |
4768 | int ust_app_clear_quiescent_app_session(struct ust_app *app, | |
4769 | struct ust_app_session *ua_sess) | |
4770 | { | |
4771 | int ret = 0; | |
4772 | struct lttng_ht_iter iter; | |
4773 | struct ust_app_channel *ua_chan; | |
4774 | struct consumer_socket *socket; | |
4775 | ||
4776 | DBG("Clearing stream quiescent state for ust app pid %d", app->pid); | |
4777 | ||
4778 | rcu_read_lock(); | |
4779 | ||
4780 | if (!app->compatible) { | |
4781 | goto end_not_compatible; | |
4782 | } | |
4783 | ||
4784 | pthread_mutex_lock(&ua_sess->lock); | |
4785 | ||
4786 | if (ua_sess->deleted) { | |
4787 | goto end_unlock; | |
4788 | } | |
4789 | ||
4790 | health_code_update(); | |
4791 | ||
4792 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
4793 | ua_sess->consumer); | |
4794 | if (!socket) { | |
4795 | ERR("Failed to find consumer (%" PRIu32 ") socket", | |
4796 | app->bits_per_long); | |
4797 | ret = -1; | |
4798 | goto end_unlock; | |
4799 | } | |
4800 | ||
4801 | /* Clear quiescent state. */ | |
4802 | switch (ua_sess->buffer_type) { | |
4803 | case LTTNG_BUFFER_PER_PID: | |
4804 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, | |
4805 | ua_chan, node.node) { | |
4806 | health_code_update(); | |
4807 | ret = consumer_clear_quiescent_channel(socket, | |
4808 | ua_chan->key); | |
4809 | if (ret) { | |
4810 | ERR("Error clearing quiescent state for consumer channel"); | |
4811 | ret = -1; | |
4812 | continue; | |
4813 | } | |
4814 | } | |
4815 | break; | |
4816 | case LTTNG_BUFFER_PER_UID: | |
4817 | default: | |
4818 | assert(0); | |
4819 | ret = -1; | |
4820 | break; | |
4821 | } | |
4822 | ||
4823 | health_code_update(); | |
4824 | ||
4825 | end_unlock: | |
4826 | pthread_mutex_unlock(&ua_sess->lock); | |
4827 | ||
4828 | end_not_compatible: | |
4829 | rcu_read_unlock(); | |
4830 | health_code_update(); | |
4831 | return ret; | |
4832 | } | |
4833 | ||
4834 | /* | |
4835 | * Clear quiescent state in each stream for all applications for a | |
4836 | * specific UST session. | |
4837 | * Called with UST session lock held. | |
4838 | */ | |
4839 | static | |
4840 | int ust_app_clear_quiescent_session(struct ltt_ust_session *usess) | |
4841 | ||
4842 | { | |
4843 | int ret = 0; | |
4844 | ||
4845 | DBG("Clearing stream quiescent state for all ust apps"); | |
4846 | ||
4847 | rcu_read_lock(); | |
4848 | ||
4849 | switch (usess->buffer_type) { | |
4850 | case LTTNG_BUFFER_PER_UID: | |
4851 | { | |
4852 | struct lttng_ht_iter iter; | |
4853 | struct buffer_reg_uid *reg; | |
4854 | ||
4855 | /* | |
4856 | * Clear quiescent for all per UID buffers associated to | |
4857 | * that session. | |
4858 | */ | |
4859 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
4860 | struct consumer_socket *socket; | |
4861 | struct buffer_reg_channel *reg_chan; | |
4862 | ||
4863 | /* Get associated consumer socket.*/ | |
4864 | socket = consumer_find_socket_by_bitness( | |
4865 | reg->bits_per_long, usess->consumer); | |
4866 | if (!socket) { | |
4867 | /* | |
4868 | * Ignore request if no consumer is found for | |
4869 | * the session. | |
4870 | */ | |
4871 | continue; | |
4872 | } | |
4873 | ||
4874 | cds_lfht_for_each_entry(reg->registry->channels->ht, | |
4875 | &iter.iter, reg_chan, node.node) { | |
4876 | /* | |
4877 | * The following call will print error values so | |
4878 | * the return code is of little importance | |
4879 | * because whatever happens, we have to try them | |
4880 | * all. | |
4881 | */ | |
4882 | (void) consumer_clear_quiescent_channel(socket, | |
4883 | reg_chan->consumer_key); | |
4884 | } | |
4885 | } | |
4886 | break; | |
4887 | } | |
4888 | case LTTNG_BUFFER_PER_PID: | |
4889 | { | |
4890 | struct ust_app_session *ua_sess; | |
4891 | struct lttng_ht_iter iter; | |
4892 | struct ust_app *app; | |
4893 | ||
4894 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, | |
4895 | pid_n.node) { | |
4896 | ua_sess = lookup_session_by_app(usess, app); | |
4897 | if (ua_sess == NULL) { | |
4898 | continue; | |
4899 | } | |
4900 | (void) ust_app_clear_quiescent_app_session(app, | |
4901 | ua_sess); | |
4902 | } | |
4903 | break; | |
4904 | } | |
4905 | default: | |
4906 | ret = -1; | |
4907 | assert(0); | |
4908 | break; | |
4909 | } | |
4910 | ||
4911 | rcu_read_unlock(); | |
4912 | health_code_update(); | |
4913 | return ret; | |
4914 | } | |
4915 | ||
84cd17c6 MD |
4916 | /* |
4917 | * Destroy a specific UST session in apps. | |
4918 | */ | |
3353de95 | 4919 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 4920 | { |
ffe60014 | 4921 | int ret; |
84cd17c6 | 4922 | struct ust_app_session *ua_sess; |
bec39940 | 4923 | struct lttng_ht_iter iter; |
d9bf3ca4 | 4924 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 4925 | |
852d0037 | 4926 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
4927 | |
4928 | rcu_read_lock(); | |
4929 | ||
e0c7ec2b DG |
4930 | if (!app->compatible) { |
4931 | goto end; | |
4932 | } | |
4933 | ||
84cd17c6 | 4934 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 4935 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 4936 | if (node == NULL) { |
d42f20df DG |
4937 | /* Session is being or is deleted. */ |
4938 | goto end; | |
84cd17c6 MD |
4939 | } |
4940 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 4941 | |
840cb59c | 4942 | health_code_update(); |
d0b96690 | 4943 | destroy_app_session(app, ua_sess); |
84cd17c6 | 4944 | |
840cb59c | 4945 | health_code_update(); |
7db205b5 | 4946 | |
84cd17c6 | 4947 | /* Quiescent wait after stopping trace */ |
fb45065e | 4948 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4949 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4950 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4951 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4952 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4953 | app->pid, ret); | |
4954 | } | |
e0c7ec2b DG |
4955 | end: |
4956 | rcu_read_unlock(); | |
840cb59c | 4957 | health_code_update(); |
84cd17c6 | 4958 | return 0; |
84cd17c6 MD |
4959 | } |
4960 | ||
5b4a0ec0 DG |
4961 | /* |
4962 | * Start tracing for the UST session. | |
4963 | */ | |
421cb601 DG |
4964 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
4965 | { | |
4966 | int ret = 0; | |
bec39940 | 4967 | struct lttng_ht_iter iter; |
421cb601 | 4968 | struct ust_app *app; |
48842b30 | 4969 | |
421cb601 DG |
4970 | DBG("Starting all UST traces"); |
4971 | ||
4972 | rcu_read_lock(); | |
421cb601 | 4973 | |
0dd01979 MD |
4974 | /* |
4975 | * In a start-stop-start use-case, we need to clear the quiescent state | |
4976 | * of each channel set by the prior stop command, thus ensuring that a | |
4977 | * following stop or destroy is sure to grab a timestamp_end near those | |
4978 | * operations, even if the packet is empty. | |
4979 | */ | |
4980 | (void) ust_app_clear_quiescent_session(usess); | |
4981 | ||
852d0037 | 4982 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
421cb601 | 4983 | ret = ust_app_start_trace(usess, app); |
48842b30 | 4984 | if (ret < 0) { |
5b4a0ec0 DG |
4985 | /* Continue to next apps even on error */ |
4986 | continue; | |
48842b30 | 4987 | } |
48842b30 | 4988 | } |
5b4a0ec0 | 4989 | |
48842b30 DG |
4990 | rcu_read_unlock(); |
4991 | ||
4992 | return 0; | |
4993 | } | |
487cf67c | 4994 | |
8be98f9a MD |
4995 | /* |
4996 | * Start tracing for the UST session. | |
ce34fcd0 | 4997 | * Called with UST session lock held. |
8be98f9a MD |
4998 | */ |
4999 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
5000 | { | |
5001 | int ret = 0; | |
bec39940 | 5002 | struct lttng_ht_iter iter; |
8be98f9a MD |
5003 | struct ust_app *app; |
5004 | ||
5005 | DBG("Stopping all UST traces"); | |
5006 | ||
5007 | rcu_read_lock(); | |
5008 | ||
b34cbebf MD |
5009 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
5010 | ret = ust_app_stop_trace(usess, app); | |
5011 | if (ret < 0) { | |
5012 | /* Continue to next apps even on error */ | |
5013 | continue; | |
5014 | } | |
5015 | } | |
5016 | ||
ce34fcd0 | 5017 | (void) ust_app_flush_session(usess); |
8be98f9a MD |
5018 | |
5019 | rcu_read_unlock(); | |
5020 | ||
5021 | return 0; | |
5022 | } | |
5023 | ||
84cd17c6 MD |
5024 | /* |
5025 | * Destroy app UST session. | |
5026 | */ | |
5027 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
5028 | { | |
5029 | int ret = 0; | |
bec39940 | 5030 | struct lttng_ht_iter iter; |
84cd17c6 MD |
5031 | struct ust_app *app; |
5032 | ||
5033 | DBG("Destroy all UST traces"); | |
5034 | ||
5035 | rcu_read_lock(); | |
5036 | ||
852d0037 | 5037 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 5038 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
5039 | if (ret < 0) { |
5040 | /* Continue to next apps even on error */ | |
5041 | continue; | |
5042 | } | |
5043 | } | |
5044 | ||
5045 | rcu_read_unlock(); | |
5046 | ||
5047 | return 0; | |
5048 | } | |
5049 | ||
a9ad0c8f MD |
5050 | static |
5051 | void ust_app_global_create(struct ltt_ust_session *usess, struct ust_app *app) | |
487cf67c | 5052 | { |
55c54cce | 5053 | int ret = 0; |
31746f93 | 5054 | struct lttng_ht_iter iter, uiter; |
3d8ca23b | 5055 | struct ust_app_session *ua_sess = NULL; |
487cf67c DG |
5056 | struct ust_app_channel *ua_chan; |
5057 | struct ust_app_event *ua_event; | |
727d5404 | 5058 | struct ust_app_ctx *ua_ctx; |
a9ad0c8f | 5059 | int is_created = 0; |
1f3580c7 | 5060 | |
03f91eaa | 5061 | ret = find_or_create_ust_app_session(usess, app, &ua_sess, &is_created); |
3d8ca23b DG |
5062 | if (ret < 0) { |
5063 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
5064 | goto error; |
5065 | } | |
a9ad0c8f MD |
5066 | if (!is_created) { |
5067 | /* App session already created. */ | |
5068 | goto end; | |
5069 | } | |
3d8ca23b | 5070 | assert(ua_sess); |
487cf67c | 5071 | |
d0b96690 DG |
5072 | pthread_mutex_lock(&ua_sess->lock); |
5073 | ||
b161602a MD |
5074 | if (ua_sess->deleted) { |
5075 | pthread_mutex_unlock(&ua_sess->lock); | |
5076 | goto end; | |
5077 | } | |
5078 | ||
284d8f55 | 5079 | /* |
d0b96690 | 5080 | * We can iterate safely here over all UST app session since the create ust |
284d8f55 DG |
5081 | * app session above made a shadow copy of the UST global domain from the |
5082 | * ltt ust session. | |
5083 | */ | |
bec39940 DG |
5084 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
5085 | node.node) { | |
ad7a9107 | 5086 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
a7169585 | 5087 | if (ret < 0 && ret != -ENOTCONN) { |
ad7a9107 | 5088 | /* |
a7169585 MD |
5089 | * Stop everything. On error, the application |
5090 | * failed, no more file descriptor are available | |
5091 | * or ENOMEM so stopping here is the only thing | |
5092 | * we can do for now. The only exception is | |
5093 | * -ENOTCONN, which indicates that the application | |
5094 | * has exit. | |
ad7a9107 DG |
5095 | */ |
5096 | goto error_unlock; | |
487cf67c DG |
5097 | } |
5098 | ||
31746f93 DG |
5099 | /* |
5100 | * Add context using the list so they are enabled in the same order the | |
5101 | * user added them. | |
5102 | */ | |
5103 | cds_list_for_each_entry(ua_ctx, &ua_chan->ctx_list, list) { | |
727d5404 DG |
5104 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); |
5105 | if (ret < 0) { | |
d0b96690 | 5106 | goto error_unlock; |
727d5404 DG |
5107 | } |
5108 | } | |
5109 | ||
5110 | ||
284d8f55 | 5111 | /* For each events */ |
bec39940 DG |
5112 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
5113 | node.node) { | |
284d8f55 DG |
5114 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
5115 | if (ret < 0) { | |
d0b96690 | 5116 | goto error_unlock; |
487cf67c | 5117 | } |
36dc12cc | 5118 | } |
487cf67c DG |
5119 | } |
5120 | ||
d0b96690 DG |
5121 | pthread_mutex_unlock(&ua_sess->lock); |
5122 | ||
14fb1ebe | 5123 | if (usess->active) { |
421cb601 | 5124 | ret = ust_app_start_trace(usess, app); |
36dc12cc | 5125 | if (ret < 0) { |
36dc12cc DG |
5126 | goto error; |
5127 | } | |
5128 | ||
852d0037 | 5129 | DBG2("UST trace started for app pid %d", app->pid); |
36dc12cc | 5130 | } |
a9ad0c8f | 5131 | end: |
ffe60014 | 5132 | /* Everything went well at this point. */ |
ffe60014 DG |
5133 | return; |
5134 | ||
d0b96690 DG |
5135 | error_unlock: |
5136 | pthread_mutex_unlock(&ua_sess->lock); | |
487cf67c | 5137 | error: |
ffe60014 | 5138 | if (ua_sess) { |
d0b96690 | 5139 | destroy_app_session(app, ua_sess); |
ffe60014 | 5140 | } |
487cf67c DG |
5141 | return; |
5142 | } | |
55cc08a6 | 5143 | |
a9ad0c8f MD |
5144 | static |
5145 | void ust_app_global_destroy(struct ltt_ust_session *usess, struct ust_app *app) | |
5146 | { | |
5147 | struct ust_app_session *ua_sess; | |
5148 | ||
5149 | ua_sess = lookup_session_by_app(usess, app); | |
5150 | if (ua_sess == NULL) { | |
5151 | return; | |
5152 | } | |
5153 | destroy_app_session(app, ua_sess); | |
5154 | } | |
5155 | ||
5156 | /* | |
5157 | * Add channels/events from UST global domain to registered apps at sock. | |
5158 | * | |
5159 | * Called with session lock held. | |
5160 | * Called with RCU read-side lock held. | |
5161 | */ | |
5162 | void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app) | |
5163 | { | |
5164 | assert(usess); | |
5165 | ||
5166 | DBG2("UST app global update for app sock %d for session id %" PRIu64, | |
5167 | app->sock, usess->id); | |
5168 | ||
5169 | if (!app->compatible) { | |
5170 | return; | |
5171 | } | |
5172 | ||
5173 | if (trace_ust_pid_tracker_lookup(usess, app->pid)) { | |
5174 | ust_app_global_create(usess, app); | |
5175 | } else { | |
5176 | ust_app_global_destroy(usess, app); | |
5177 | } | |
5178 | } | |
5179 | ||
5180 | /* | |
5181 | * Called with session lock held. | |
5182 | */ | |
5183 | void ust_app_global_update_all(struct ltt_ust_session *usess) | |
5184 | { | |
5185 | struct lttng_ht_iter iter; | |
5186 | struct ust_app *app; | |
5187 | ||
5188 | rcu_read_lock(); | |
5189 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5190 | ust_app_global_update(usess, app); | |
5191 | } | |
5192 | rcu_read_unlock(); | |
5193 | } | |
5194 | ||
55cc08a6 DG |
5195 | /* |
5196 | * Add context to a specific channel for global UST domain. | |
5197 | */ | |
5198 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
5199 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
5200 | { | |
5201 | int ret = 0; | |
bec39940 DG |
5202 | struct lttng_ht_node_str *ua_chan_node; |
5203 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
5204 | struct ust_app_channel *ua_chan = NULL; |
5205 | struct ust_app_session *ua_sess; | |
5206 | struct ust_app *app; | |
5207 | ||
5208 | rcu_read_lock(); | |
5209 | ||
852d0037 | 5210 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
5211 | if (!app->compatible) { |
5212 | /* | |
5213 | * TODO: In time, we should notice the caller of this error by | |
5214 | * telling him that this is a version error. | |
5215 | */ | |
5216 | continue; | |
5217 | } | |
55cc08a6 DG |
5218 | ua_sess = lookup_session_by_app(usess, app); |
5219 | if (ua_sess == NULL) { | |
5220 | continue; | |
5221 | } | |
5222 | ||
d0b96690 | 5223 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
5224 | |
5225 | if (ua_sess->deleted) { | |
5226 | pthread_mutex_unlock(&ua_sess->lock); | |
5227 | continue; | |
5228 | } | |
5229 | ||
55cc08a6 | 5230 | /* Lookup channel in the ust app session */ |
bec39940 DG |
5231 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
5232 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 5233 | if (ua_chan_node == NULL) { |
d0b96690 | 5234 | goto next_app; |
55cc08a6 DG |
5235 | } |
5236 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
5237 | node); | |
c9edf082 | 5238 | ret = create_ust_app_channel_context(ua_chan, &uctx->ctx, app); |
55cc08a6 | 5239 | if (ret < 0) { |
d0b96690 | 5240 | goto next_app; |
55cc08a6 | 5241 | } |
d0b96690 DG |
5242 | next_app: |
5243 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
5244 | } |
5245 | ||
55cc08a6 DG |
5246 | rcu_read_unlock(); |
5247 | return ret; | |
5248 | } | |
5249 | ||
76d45b40 DG |
5250 | /* |
5251 | * Enable event for a channel from a UST session for a specific PID. | |
5252 | */ | |
5253 | int ust_app_enable_event_pid(struct ltt_ust_session *usess, | |
5254 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
5255 | { | |
5256 | int ret = 0; | |
bec39940 | 5257 | struct lttng_ht_iter iter; |
18eace3b | 5258 | struct lttng_ht_node_str *ua_chan_node; |
76d45b40 DG |
5259 | struct ust_app *app; |
5260 | struct ust_app_session *ua_sess; | |
5261 | struct ust_app_channel *ua_chan; | |
5262 | struct ust_app_event *ua_event; | |
5263 | ||
5264 | DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid); | |
5265 | ||
5266 | rcu_read_lock(); | |
5267 | ||
5268 | app = ust_app_find_by_pid(pid); | |
5269 | if (app == NULL) { | |
5270 | ERR("UST app enable event per PID %d not found", pid); | |
5271 | ret = -1; | |
d0b96690 | 5272 | goto end; |
76d45b40 DG |
5273 | } |
5274 | ||
e0c7ec2b DG |
5275 | if (!app->compatible) { |
5276 | ret = 0; | |
d0b96690 | 5277 | goto end; |
e0c7ec2b DG |
5278 | } |
5279 | ||
76d45b40 | 5280 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
5281 | if (!ua_sess) { |
5282 | /* The application has problem or is probably dead. */ | |
d0b96690 DG |
5283 | ret = 0; |
5284 | goto end; | |
c4a1715b | 5285 | } |
76d45b40 | 5286 | |
d0b96690 | 5287 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
5288 | |
5289 | if (ua_sess->deleted) { | |
5290 | ret = 0; | |
5291 | goto end_unlock; | |
5292 | } | |
5293 | ||
76d45b40 | 5294 | /* Lookup channel in the ust app session */ |
bec39940 DG |
5295 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
5296 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
76d45b40 DG |
5297 | /* If the channel is not found, there is a code flow error */ |
5298 | assert(ua_chan_node); | |
5299 | ||
5300 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
5301 | ||
18eace3b | 5302 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 5303 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 5304 | if (ua_event == NULL) { |
76d45b40 DG |
5305 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
5306 | if (ret < 0) { | |
d0b96690 | 5307 | goto end_unlock; |
76d45b40 DG |
5308 | } |
5309 | } else { | |
76d45b40 DG |
5310 | ret = enable_ust_app_event(ua_sess, ua_event, app); |
5311 | if (ret < 0) { | |
d0b96690 | 5312 | goto end_unlock; |
76d45b40 DG |
5313 | } |
5314 | } | |
5315 | ||
d0b96690 DG |
5316 | end_unlock: |
5317 | pthread_mutex_unlock(&ua_sess->lock); | |
5318 | end: | |
76d45b40 DG |
5319 | rcu_read_unlock(); |
5320 | return ret; | |
5321 | } | |
7f79d3a1 | 5322 | |
d0b96690 DG |
5323 | /* |
5324 | * Receive registration and populate the given msg structure. | |
5325 | * | |
5326 | * On success return 0 else a negative value returned by the ustctl call. | |
5327 | */ | |
5328 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
5329 | { | |
5330 | int ret; | |
5331 | uint32_t pid, ppid, uid, gid; | |
5332 | ||
5333 | assert(msg); | |
5334 | ||
5335 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
5336 | &pid, &ppid, &uid, &gid, | |
5337 | &msg->bits_per_long, | |
5338 | &msg->uint8_t_alignment, | |
5339 | &msg->uint16_t_alignment, | |
5340 | &msg->uint32_t_alignment, | |
5341 | &msg->uint64_t_alignment, | |
5342 | &msg->long_alignment, | |
5343 | &msg->byte_order, | |
5344 | msg->name); | |
5345 | if (ret < 0) { | |
5346 | switch (-ret) { | |
5347 | case EPIPE: | |
5348 | case ECONNRESET: | |
5349 | case LTTNG_UST_ERR_EXITING: | |
5350 | DBG3("UST app recv reg message failed. Application died"); | |
5351 | break; | |
5352 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
5353 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
5354 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
5355 | LTTNG_UST_ABI_MINOR_VERSION); | |
5356 | break; | |
5357 | default: | |
5358 | ERR("UST app recv reg message failed with ret %d", ret); | |
5359 | break; | |
5360 | } | |
5361 | goto error; | |
5362 | } | |
5363 | msg->pid = (pid_t) pid; | |
5364 | msg->ppid = (pid_t) ppid; | |
5365 | msg->uid = (uid_t) uid; | |
5366 | msg->gid = (gid_t) gid; | |
5367 | ||
5368 | error: | |
5369 | return ret; | |
5370 | } | |
5371 | ||
10b56aef MD |
5372 | /* |
5373 | * Return a ust app session object using the application object and the | |
5374 | * session object descriptor has a key. If not found, NULL is returned. | |
5375 | * A RCU read side lock MUST be acquired when calling this function. | |
5376 | */ | |
5377 | static struct ust_app_session *find_session_by_objd(struct ust_app *app, | |
5378 | int objd) | |
5379 | { | |
5380 | struct lttng_ht_node_ulong *node; | |
5381 | struct lttng_ht_iter iter; | |
5382 | struct ust_app_session *ua_sess = NULL; | |
5383 | ||
5384 | assert(app); | |
5385 | ||
5386 | lttng_ht_lookup(app->ust_sessions_objd, (void *)((unsigned long) objd), &iter); | |
5387 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5388 | if (node == NULL) { | |
5389 | DBG2("UST app session find by objd %d not found", objd); | |
5390 | goto error; | |
5391 | } | |
5392 | ||
5393 | ua_sess = caa_container_of(node, struct ust_app_session, ust_objd_node); | |
5394 | ||
5395 | error: | |
5396 | return ua_sess; | |
5397 | } | |
5398 | ||
d88aee68 DG |
5399 | /* |
5400 | * Return a ust app channel object using the application object and the channel | |
5401 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
5402 | * lock MUST be acquired before calling this function. | |
5403 | */ | |
d0b96690 DG |
5404 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
5405 | int objd) | |
5406 | { | |
5407 | struct lttng_ht_node_ulong *node; | |
5408 | struct lttng_ht_iter iter; | |
5409 | struct ust_app_channel *ua_chan = NULL; | |
5410 | ||
5411 | assert(app); | |
5412 | ||
5413 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
5414 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5415 | if (node == NULL) { | |
5416 | DBG2("UST app channel find by objd %d not found", objd); | |
5417 | goto error; | |
5418 | } | |
5419 | ||
5420 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
5421 | ||
5422 | error: | |
5423 | return ua_chan; | |
5424 | } | |
5425 | ||
d88aee68 DG |
5426 | /* |
5427 | * Reply to a register channel notification from an application on the notify | |
5428 | * socket. The channel metadata is also created. | |
5429 | * | |
5430 | * The session UST registry lock is acquired in this function. | |
5431 | * | |
5432 | * On success 0 is returned else a negative value. | |
5433 | */ | |
8eede835 | 5434 | static int reply_ust_register_channel(int sock, int cobjd, |
d0b96690 DG |
5435 | size_t nr_fields, struct ustctl_field *fields) |
5436 | { | |
5437 | int ret, ret_code = 0; | |
294e218e | 5438 | uint32_t chan_id; |
7972aab2 | 5439 | uint64_t chan_reg_key; |
d0b96690 DG |
5440 | enum ustctl_channel_header type; |
5441 | struct ust_app *app; | |
5442 | struct ust_app_channel *ua_chan; | |
5443 | struct ust_app_session *ua_sess; | |
7972aab2 | 5444 | struct ust_registry_session *registry; |
45893984 | 5445 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
5446 | |
5447 | rcu_read_lock(); | |
5448 | ||
5449 | /* Lookup application. If not found, there is a code flow error. */ | |
5450 | app = find_app_by_notify_sock(sock); | |
d88aee68 | 5451 | if (!app) { |
fad1ed2f | 5452 | DBG("Application socket %d is being torn down. Abort event notify", |
d88aee68 DG |
5453 | sock); |
5454 | ret = 0; | |
5455 | goto error_rcu_unlock; | |
5456 | } | |
d0b96690 | 5457 | |
4950b860 | 5458 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 5459 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 | 5460 | if (!ua_chan) { |
fad1ed2f | 5461 | DBG("Application channel is being torn down. Abort event notify"); |
4950b860 MD |
5462 | ret = 0; |
5463 | goto error_rcu_unlock; | |
5464 | } | |
5465 | ||
d0b96690 DG |
5466 | assert(ua_chan->session); |
5467 | ua_sess = ua_chan->session; | |
d0b96690 | 5468 | |
7972aab2 DG |
5469 | /* Get right session registry depending on the session buffer type. */ |
5470 | registry = get_session_registry(ua_sess); | |
fad1ed2f JR |
5471 | if (!registry) { |
5472 | DBG("Application session is being torn down. Abort event notify"); | |
5473 | ret = 0; | |
5474 | goto error_rcu_unlock; | |
5475 | }; | |
45893984 | 5476 | |
7972aab2 DG |
5477 | /* Depending on the buffer type, a different channel key is used. */ |
5478 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
5479 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 5480 | } else { |
7972aab2 | 5481 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
5482 | } |
5483 | ||
7972aab2 DG |
5484 | pthread_mutex_lock(®istry->lock); |
5485 | ||
5486 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
5487 | assert(chan_reg); | |
5488 | ||
5489 | if (!chan_reg->register_done) { | |
294e218e MD |
5490 | /* |
5491 | * TODO: eventually use the registry event count for | |
5492 | * this channel to better guess header type for per-pid | |
5493 | * buffers. | |
5494 | */ | |
5495 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
7972aab2 DG |
5496 | chan_reg->nr_ctx_fields = nr_fields; |
5497 | chan_reg->ctx_fields = fields; | |
fad1ed2f | 5498 | fields = NULL; |
7972aab2 | 5499 | chan_reg->header_type = type; |
d0b96690 | 5500 | } else { |
7972aab2 DG |
5501 | /* Get current already assigned values. */ |
5502 | type = chan_reg->header_type; | |
d0b96690 | 5503 | } |
7972aab2 DG |
5504 | /* Channel id is set during the object creation. */ |
5505 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
5506 | |
5507 | /* Append to metadata */ | |
7972aab2 DG |
5508 | if (!chan_reg->metadata_dumped) { |
5509 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
5510 | if (ret_code) { |
5511 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
5512 | goto reply; | |
5513 | } | |
5514 | } | |
5515 | ||
5516 | reply: | |
7972aab2 DG |
5517 | DBG3("UST app replying to register channel key %" PRIu64 |
5518 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
5519 | ret_code); | |
d0b96690 DG |
5520 | |
5521 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
5522 | if (ret < 0) { | |
5523 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5524 | ERR("UST app reply channel failed with ret %d", ret); | |
5525 | } else { | |
5526 | DBG3("UST app reply channel failed. Application died"); | |
5527 | } | |
5528 | goto error; | |
5529 | } | |
5530 | ||
7972aab2 DG |
5531 | /* This channel registry registration is completed. */ |
5532 | chan_reg->register_done = 1; | |
5533 | ||
d0b96690 | 5534 | error: |
7972aab2 | 5535 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 5536 | error_rcu_unlock: |
d0b96690 | 5537 | rcu_read_unlock(); |
fad1ed2f | 5538 | free(fields); |
d0b96690 DG |
5539 | return ret; |
5540 | } | |
5541 | ||
d88aee68 DG |
5542 | /* |
5543 | * Add event to the UST channel registry. When the event is added to the | |
5544 | * registry, the metadata is also created. Once done, this replies to the | |
5545 | * application with the appropriate error code. | |
5546 | * | |
5547 | * The session UST registry lock is acquired in the function. | |
5548 | * | |
5549 | * On success 0 is returned else a negative value. | |
5550 | */ | |
d0b96690 | 5551 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
2106efa0 PP |
5552 | char *sig, size_t nr_fields, struct ustctl_field *fields, |
5553 | int loglevel_value, char *model_emf_uri) | |
d0b96690 DG |
5554 | { |
5555 | int ret, ret_code; | |
5556 | uint32_t event_id = 0; | |
7972aab2 | 5557 | uint64_t chan_reg_key; |
d0b96690 DG |
5558 | struct ust_app *app; |
5559 | struct ust_app_channel *ua_chan; | |
5560 | struct ust_app_session *ua_sess; | |
7972aab2 | 5561 | struct ust_registry_session *registry; |
d0b96690 DG |
5562 | |
5563 | rcu_read_lock(); | |
5564 | ||
5565 | /* Lookup application. If not found, there is a code flow error. */ | |
5566 | app = find_app_by_notify_sock(sock); | |
d88aee68 | 5567 | if (!app) { |
fad1ed2f | 5568 | DBG("Application socket %d is being torn down. Abort event notify", |
d88aee68 DG |
5569 | sock); |
5570 | ret = 0; | |
5571 | goto error_rcu_unlock; | |
5572 | } | |
d0b96690 | 5573 | |
4950b860 | 5574 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 5575 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 | 5576 | if (!ua_chan) { |
fad1ed2f | 5577 | DBG("Application channel is being torn down. Abort event notify"); |
4950b860 MD |
5578 | ret = 0; |
5579 | goto error_rcu_unlock; | |
5580 | } | |
5581 | ||
d0b96690 DG |
5582 | assert(ua_chan->session); |
5583 | ua_sess = ua_chan->session; | |
5584 | ||
7972aab2 | 5585 | registry = get_session_registry(ua_sess); |
fad1ed2f JR |
5586 | if (!registry) { |
5587 | DBG("Application session is being torn down. Abort event notify"); | |
5588 | ret = 0; | |
5589 | goto error_rcu_unlock; | |
5590 | } | |
7972aab2 DG |
5591 | |
5592 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
5593 | chan_reg_key = ua_chan->tracing_channel_id; | |
5594 | } else { | |
5595 | chan_reg_key = ua_chan->key; | |
5596 | } | |
5597 | ||
5598 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 5599 | |
d5d629b5 DG |
5600 | /* |
5601 | * From this point on, this call acquires the ownership of the sig, fields | |
5602 | * and model_emf_uri meaning any free are done inside it if needed. These | |
5603 | * three variables MUST NOT be read/write after this. | |
5604 | */ | |
7972aab2 | 5605 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
2106efa0 PP |
5606 | sobjd, cobjd, name, sig, nr_fields, fields, |
5607 | loglevel_value, model_emf_uri, ua_sess->buffer_type, | |
5608 | &event_id, app); | |
fad1ed2f JR |
5609 | sig = NULL; |
5610 | fields = NULL; | |
5611 | model_emf_uri = NULL; | |
d0b96690 DG |
5612 | |
5613 | /* | |
5614 | * The return value is returned to ustctl so in case of an error, the | |
5615 | * application can be notified. In case of an error, it's important not to | |
5616 | * return a negative error or else the application will get closed. | |
5617 | */ | |
5618 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
5619 | if (ret < 0) { | |
5620 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5621 | ERR("UST app reply event failed with ret %d", ret); | |
5622 | } else { | |
5623 | DBG3("UST app reply event failed. Application died"); | |
5624 | } | |
5625 | /* | |
5626 | * No need to wipe the create event since the application socket will | |
5627 | * get close on error hence cleaning up everything by itself. | |
5628 | */ | |
5629 | goto error; | |
5630 | } | |
5631 | ||
7972aab2 DG |
5632 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
5633 | name, event_id); | |
d88aee68 | 5634 | |
d0b96690 | 5635 | error: |
7972aab2 | 5636 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 5637 | error_rcu_unlock: |
d0b96690 | 5638 | rcu_read_unlock(); |
fad1ed2f JR |
5639 | free(sig); |
5640 | free(fields); | |
5641 | free(model_emf_uri); | |
d0b96690 DG |
5642 | return ret; |
5643 | } | |
5644 | ||
10b56aef MD |
5645 | /* |
5646 | * Add enum to the UST session registry. Once done, this replies to the | |
5647 | * application with the appropriate error code. | |
5648 | * | |
5649 | * The session UST registry lock is acquired within this function. | |
5650 | * | |
5651 | * On success 0 is returned else a negative value. | |
5652 | */ | |
5653 | static int add_enum_ust_registry(int sock, int sobjd, char *name, | |
5654 | struct ustctl_enum_entry *entries, size_t nr_entries) | |
5655 | { | |
5656 | int ret = 0, ret_code; | |
5657 | struct ust_app *app; | |
5658 | struct ust_app_session *ua_sess; | |
5659 | struct ust_registry_session *registry; | |
5660 | uint64_t enum_id = -1ULL; | |
5661 | ||
5662 | rcu_read_lock(); | |
5663 | ||
5664 | /* Lookup application. If not found, there is a code flow error. */ | |
5665 | app = find_app_by_notify_sock(sock); | |
5666 | if (!app) { | |
5667 | /* Return an error since this is not an error */ | |
5668 | DBG("Application socket %d is being torn down. Aborting enum registration", | |
5669 | sock); | |
5670 | free(entries); | |
5671 | goto error_rcu_unlock; | |
5672 | } | |
5673 | ||
5674 | /* Lookup session by UST object descriptor. */ | |
5675 | ua_sess = find_session_by_objd(app, sobjd); | |
5676 | if (!ua_sess) { | |
5677 | /* Return an error since this is not an error */ | |
fad1ed2f | 5678 | DBG("Application session is being torn down (session not found). Aborting enum registration."); |
10b56aef MD |
5679 | free(entries); |
5680 | goto error_rcu_unlock; | |
5681 | } | |
5682 | ||
5683 | registry = get_session_registry(ua_sess); | |
fad1ed2f JR |
5684 | if (!registry) { |
5685 | DBG("Application session is being torn down (registry not found). Aborting enum registration."); | |
5686 | free(entries); | |
5687 | goto error_rcu_unlock; | |
5688 | } | |
10b56aef MD |
5689 | |
5690 | pthread_mutex_lock(®istry->lock); | |
5691 | ||
5692 | /* | |
5693 | * From this point on, the callee acquires the ownership of | |
5694 | * entries. The variable entries MUST NOT be read/written after | |
5695 | * call. | |
5696 | */ | |
5697 | ret_code = ust_registry_create_or_find_enum(registry, sobjd, name, | |
5698 | entries, nr_entries, &enum_id); | |
5699 | entries = NULL; | |
5700 | ||
5701 | /* | |
5702 | * The return value is returned to ustctl so in case of an error, the | |
5703 | * application can be notified. In case of an error, it's important not to | |
5704 | * return a negative error or else the application will get closed. | |
5705 | */ | |
5706 | ret = ustctl_reply_register_enum(sock, enum_id, ret_code); | |
5707 | if (ret < 0) { | |
5708 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5709 | ERR("UST app reply enum failed with ret %d", ret); | |
5710 | } else { | |
5711 | DBG3("UST app reply enum failed. Application died"); | |
5712 | } | |
5713 | /* | |
5714 | * No need to wipe the create enum since the application socket will | |
5715 | * get close on error hence cleaning up everything by itself. | |
5716 | */ | |
5717 | goto error; | |
5718 | } | |
5719 | ||
5720 | DBG3("UST registry enum %s added successfully or already found", name); | |
5721 | ||
5722 | error: | |
5723 | pthread_mutex_unlock(®istry->lock); | |
5724 | error_rcu_unlock: | |
5725 | rcu_read_unlock(); | |
5726 | return ret; | |
5727 | } | |
5728 | ||
d88aee68 DG |
5729 | /* |
5730 | * Handle application notification through the given notify socket. | |
5731 | * | |
5732 | * Return 0 on success or else a negative value. | |
5733 | */ | |
d0b96690 DG |
5734 | int ust_app_recv_notify(int sock) |
5735 | { | |
5736 | int ret; | |
5737 | enum ustctl_notify_cmd cmd; | |
5738 | ||
5739 | DBG3("UST app receiving notify from sock %d", sock); | |
5740 | ||
5741 | ret = ustctl_recv_notify(sock, &cmd); | |
5742 | if (ret < 0) { | |
5743 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5744 | ERR("UST app recv notify failed with ret %d", ret); | |
5745 | } else { | |
5746 | DBG3("UST app recv notify failed. Application died"); | |
5747 | } | |
5748 | goto error; | |
5749 | } | |
5750 | ||
5751 | switch (cmd) { | |
5752 | case USTCTL_NOTIFY_CMD_EVENT: | |
5753 | { | |
2106efa0 | 5754 | int sobjd, cobjd, loglevel_value; |
d0b96690 DG |
5755 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; |
5756 | size_t nr_fields; | |
5757 | struct ustctl_field *fields; | |
5758 | ||
5759 | DBG2("UST app ustctl register event received"); | |
5760 | ||
2106efa0 PP |
5761 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, |
5762 | &loglevel_value, &sig, &nr_fields, &fields, | |
5763 | &model_emf_uri); | |
d0b96690 DG |
5764 | if (ret < 0) { |
5765 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5766 | ERR("UST app recv event failed with ret %d", ret); | |
5767 | } else { | |
5768 | DBG3("UST app recv event failed. Application died"); | |
5769 | } | |
5770 | goto error; | |
5771 | } | |
5772 | ||
d5d629b5 DG |
5773 | /* |
5774 | * Add event to the UST registry coming from the notify socket. This | |
5775 | * call will free if needed the sig, fields and model_emf_uri. This | |
5776 | * code path loses the ownsership of these variables and transfer them | |
5777 | * to the this function. | |
5778 | */ | |
d0b96690 | 5779 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
2106efa0 | 5780 | fields, loglevel_value, model_emf_uri); |
d0b96690 DG |
5781 | if (ret < 0) { |
5782 | goto error; | |
5783 | } | |
5784 | ||
5785 | break; | |
5786 | } | |
5787 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
5788 | { | |
5789 | int sobjd, cobjd; | |
5790 | size_t nr_fields; | |
5791 | struct ustctl_field *fields; | |
5792 | ||
5793 | DBG2("UST app ustctl register channel received"); | |
5794 | ||
5795 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
5796 | &fields); | |
5797 | if (ret < 0) { | |
5798 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5799 | ERR("UST app recv channel failed with ret %d", ret); | |
5800 | } else { | |
5801 | DBG3("UST app recv channel failed. Application died"); | |
5802 | } | |
5803 | goto error; | |
5804 | } | |
5805 | ||
d5d629b5 DG |
5806 | /* |
5807 | * The fields ownership are transfered to this function call meaning | |
5808 | * that if needed it will be freed. After this, it's invalid to access | |
5809 | * fields or clean it up. | |
5810 | */ | |
8eede835 | 5811 | ret = reply_ust_register_channel(sock, cobjd, nr_fields, |
d0b96690 DG |
5812 | fields); |
5813 | if (ret < 0) { | |
5814 | goto error; | |
5815 | } | |
5816 | ||
5817 | break; | |
5818 | } | |
10b56aef MD |
5819 | case USTCTL_NOTIFY_CMD_ENUM: |
5820 | { | |
5821 | int sobjd; | |
5822 | char name[LTTNG_UST_SYM_NAME_LEN]; | |
5823 | size_t nr_entries; | |
5824 | struct ustctl_enum_entry *entries; | |
5825 | ||
5826 | DBG2("UST app ustctl register enum received"); | |
5827 | ||
5828 | ret = ustctl_recv_register_enum(sock, &sobjd, name, | |
5829 | &entries, &nr_entries); | |
5830 | if (ret < 0) { | |
5831 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5832 | ERR("UST app recv enum failed with ret %d", ret); | |
5833 | } else { | |
5834 | DBG3("UST app recv enum failed. Application died"); | |
5835 | } | |
5836 | goto error; | |
5837 | } | |
5838 | ||
5839 | /* Callee assumes ownership of entries */ | |
5840 | ret = add_enum_ust_registry(sock, sobjd, name, | |
5841 | entries, nr_entries); | |
5842 | if (ret < 0) { | |
5843 | goto error; | |
5844 | } | |
5845 | ||
5846 | break; | |
5847 | } | |
d0b96690 DG |
5848 | default: |
5849 | /* Should NEVER happen. */ | |
5850 | assert(0); | |
5851 | } | |
5852 | ||
5853 | error: | |
5854 | return ret; | |
5855 | } | |
d88aee68 DG |
5856 | |
5857 | /* | |
5858 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
5859 | * corresponding application. On failure, the call_rcu to close the socket is | |
5860 | * executed. If an application is found, it tries to delete it from the notify | |
5861 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
5862 | * | |
5863 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
5864 | * call RCU is not done but the rest of the cleanup is. | |
5865 | */ | |
5866 | void ust_app_notify_sock_unregister(int sock) | |
5867 | { | |
5868 | int err_enomem = 0; | |
5869 | struct lttng_ht_iter iter; | |
5870 | struct ust_app *app; | |
5871 | struct ust_app_notify_sock_obj *obj; | |
5872 | ||
5873 | assert(sock >= 0); | |
5874 | ||
5875 | rcu_read_lock(); | |
5876 | ||
5877 | obj = zmalloc(sizeof(*obj)); | |
5878 | if (!obj) { | |
5879 | /* | |
5880 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
5881 | * procedure but the call_rcu will not be called. In this case, we | |
5882 | * accept the fd leak rather than possibly creating an unsynchronized | |
5883 | * state between threads. | |
5884 | * | |
5885 | * TODO: The notify object should be created once the notify socket is | |
5886 | * registered and stored independantely from the ust app object. The | |
5887 | * tricky part is to synchronize the teardown of the application and | |
5888 | * this notify object. Let's keep that in mind so we can avoid this | |
5889 | * kind of shenanigans with ENOMEM in the teardown path. | |
5890 | */ | |
5891 | err_enomem = 1; | |
5892 | } else { | |
5893 | obj->fd = sock; | |
5894 | } | |
5895 | ||
5896 | DBG("UST app notify socket unregister %d", sock); | |
5897 | ||
5898 | /* | |
5899 | * Lookup application by notify socket. If this fails, this means that the | |
5900 | * hash table delete has already been done by the application | |
5901 | * unregistration process so we can safely close the notify socket in a | |
5902 | * call RCU. | |
5903 | */ | |
5904 | app = find_app_by_notify_sock(sock); | |
5905 | if (!app) { | |
5906 | goto close_socket; | |
5907 | } | |
5908 | ||
5909 | iter.iter.node = &app->notify_sock_n.node; | |
5910 | ||
5911 | /* | |
5912 | * Whatever happens here either we fail or succeed, in both cases we have | |
5913 | * to close the socket after a grace period to continue to the call RCU | |
5914 | * here. If the deletion is successful, the application is not visible | |
5915 | * anymore by other threads and is it fails it means that it was already | |
5916 | * deleted from the hash table so either way we just have to close the | |
5917 | * socket. | |
5918 | */ | |
5919 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
5920 | ||
5921 | close_socket: | |
5922 | rcu_read_unlock(); | |
5923 | ||
5924 | /* | |
5925 | * Close socket after a grace period to avoid for the socket to be reused | |
5926 | * before the application object is freed creating potential race between | |
5927 | * threads trying to add unique in the global hash table. | |
5928 | */ | |
5929 | if (!err_enomem) { | |
5930 | call_rcu(&obj->head, close_notify_sock_rcu); | |
5931 | } | |
5932 | } | |
f45e313d DG |
5933 | |
5934 | /* | |
5935 | * Destroy a ust app data structure and free its memory. | |
5936 | */ | |
5937 | void ust_app_destroy(struct ust_app *app) | |
5938 | { | |
5939 | if (!app) { | |
5940 | return; | |
5941 | } | |
5942 | ||
5943 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
5944 | } | |
6dc3064a DG |
5945 | |
5946 | /* | |
5947 | * Take a snapshot for a given UST session. The snapshot is sent to the given | |
5948 | * output. | |
5949 | * | |
5950 | * Return 0 on success or else a negative value. | |
5951 | */ | |
5952 | int ust_app_snapshot_record(struct ltt_ust_session *usess, | |
d07ceecd MD |
5953 | struct snapshot_output *output, int wait, |
5954 | uint64_t nb_packets_per_stream) | |
6dc3064a DG |
5955 | { |
5956 | int ret = 0; | |
5957 | struct lttng_ht_iter iter; | |
5958 | struct ust_app *app; | |
af706bb7 | 5959 | char pathname[PATH_MAX]; |
e098433c JG |
5960 | struct ltt_session *session; |
5961 | uint64_t trace_archive_id; | |
6dc3064a DG |
5962 | |
5963 | assert(usess); | |
5964 | assert(output); | |
5965 | ||
5966 | rcu_read_lock(); | |
5967 | ||
e098433c JG |
5968 | session = session_find_by_id(usess->id); |
5969 | assert(session); | |
5970 | assert(pthread_mutex_trylock(&session->lock)); | |
5971 | assert(session_trylock_list()); | |
5972 | trace_archive_id = session->current_archive_id; | |
5973 | ||
8c924c7b MD |
5974 | switch (usess->buffer_type) { |
5975 | case LTTNG_BUFFER_PER_UID: | |
5976 | { | |
5977 | struct buffer_reg_uid *reg; | |
6dc3064a | 5978 | |
8c924c7b MD |
5979 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
5980 | struct buffer_reg_channel *reg_chan; | |
5981 | struct consumer_socket *socket; | |
6dc3064a | 5982 | |
2b269489 JR |
5983 | if (!reg->registry->reg.ust->metadata_key) { |
5984 | /* Skip since no metadata is present */ | |
5985 | continue; | |
5986 | } | |
5987 | ||
8c924c7b MD |
5988 | /* Get consumer socket to use to push the metadata.*/ |
5989 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
5990 | usess->consumer); | |
5991 | if (!socket) { | |
5992 | ret = -EINVAL; | |
5993 | goto error; | |
5994 | } | |
6dc3064a | 5995 | |
8c924c7b MD |
5996 | memset(pathname, 0, sizeof(pathname)); |
5997 | ret = snprintf(pathname, sizeof(pathname), | |
5998 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH, | |
5999 | reg->uid, reg->bits_per_long); | |
6000 | if (ret < 0) { | |
6001 | PERROR("snprintf snapshot path"); | |
6002 | goto error; | |
6003 | } | |
6004 | ||
6005 | /* Add the UST default trace dir to path. */ | |
6006 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
6007 | reg_chan, node.node) { | |
e098433c JG |
6008 | ret = consumer_snapshot_channel(socket, |
6009 | reg_chan->consumer_key, | |
6010 | output, 0, usess->uid, | |
6011 | usess->gid, pathname, wait, | |
6012 | nb_packets_per_stream, | |
6013 | trace_archive_id); | |
8c924c7b MD |
6014 | if (ret < 0) { |
6015 | goto error; | |
6016 | } | |
6017 | } | |
68808f4e DG |
6018 | ret = consumer_snapshot_channel(socket, |
6019 | reg->registry->reg.ust->metadata_key, output, 1, | |
e098433c JG |
6020 | usess->uid, usess->gid, pathname, wait, 0, |
6021 | trace_archive_id); | |
8c924c7b MD |
6022 | if (ret < 0) { |
6023 | goto error; | |
6024 | } | |
af706bb7 | 6025 | } |
8c924c7b MD |
6026 | break; |
6027 | } | |
6028 | case LTTNG_BUFFER_PER_PID: | |
6029 | { | |
6030 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6031 | struct consumer_socket *socket; | |
6032 | struct lttng_ht_iter chan_iter; | |
6033 | struct ust_app_channel *ua_chan; | |
6034 | struct ust_app_session *ua_sess; | |
6035 | struct ust_registry_session *registry; | |
6036 | ||
6037 | ua_sess = lookup_session_by_app(usess, app); | |
6038 | if (!ua_sess) { | |
6039 | /* Session not associated with this app. */ | |
6040 | continue; | |
6041 | } | |
af706bb7 | 6042 | |
8c924c7b MD |
6043 | /* Get the right consumer socket for the application. */ |
6044 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
6045 | output->consumer); | |
6046 | if (!socket) { | |
5c786ded | 6047 | ret = -EINVAL; |
5c786ded JD |
6048 | goto error; |
6049 | } | |
6050 | ||
8c924c7b MD |
6051 | /* Add the UST default trace dir to path. */ |
6052 | memset(pathname, 0, sizeof(pathname)); | |
6053 | ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "/%s", | |
6054 | ua_sess->path); | |
6dc3064a | 6055 | if (ret < 0) { |
8c924c7b | 6056 | PERROR("snprintf snapshot path"); |
6dc3064a DG |
6057 | goto error; |
6058 | } | |
6dc3064a | 6059 | |
8c924c7b MD |
6060 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, |
6061 | ua_chan, node.node) { | |
e098433c JG |
6062 | ret = consumer_snapshot_channel(socket, |
6063 | ua_chan->key, output, | |
6064 | 0, ua_sess->euid, ua_sess->egid, | |
6065 | pathname, wait, | |
6066 | nb_packets_per_stream, | |
6067 | trace_archive_id); | |
8c924c7b | 6068 | if (ret < 0) { |
9bbfb88c MD |
6069 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) { |
6070 | continue; | |
6071 | } | |
8c924c7b MD |
6072 | goto error; |
6073 | } | |
6074 | } | |
6075 | ||
6076 | registry = get_session_registry(ua_sess); | |
fad1ed2f | 6077 | if (!registry) { |
9bbfb88c MD |
6078 | DBG("Application session is being torn down. Skip application."); |
6079 | continue; | |
fad1ed2f | 6080 | } |
e098433c JG |
6081 | ret = consumer_snapshot_channel(socket, |
6082 | registry->metadata_key, output, | |
6083 | 1, ua_sess->euid, ua_sess->egid, | |
6084 | pathname, wait, 0, | |
6085 | trace_archive_id); | |
8c924c7b | 6086 | if (ret < 0) { |
9bbfb88c MD |
6087 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) { |
6088 | continue; | |
6089 | } | |
8c924c7b MD |
6090 | goto error; |
6091 | } | |
6092 | } | |
6093 | break; | |
6094 | } | |
6095 | default: | |
6096 | assert(0); | |
6097 | break; | |
6dc3064a DG |
6098 | } |
6099 | ||
6100 | error: | |
6101 | rcu_read_unlock(); | |
6102 | return ret; | |
6103 | } | |
5c786ded JD |
6104 | |
6105 | /* | |
d07ceecd | 6106 | * Return the size taken by one more packet per stream. |
5c786ded | 6107 | */ |
d07ceecd MD |
6108 | uint64_t ust_app_get_size_one_more_packet_per_stream(struct ltt_ust_session *usess, |
6109 | uint64_t cur_nr_packets) | |
5c786ded | 6110 | { |
d07ceecd | 6111 | uint64_t tot_size = 0; |
5c786ded JD |
6112 | struct ust_app *app; |
6113 | struct lttng_ht_iter iter; | |
6114 | ||
6115 | assert(usess); | |
6116 | ||
6117 | switch (usess->buffer_type) { | |
6118 | case LTTNG_BUFFER_PER_UID: | |
6119 | { | |
6120 | struct buffer_reg_uid *reg; | |
6121 | ||
6122 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
6123 | struct buffer_reg_channel *reg_chan; | |
6124 | ||
b7064eaa | 6125 | rcu_read_lock(); |
5c786ded JD |
6126 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
6127 | reg_chan, node.node) { | |
d07ceecd MD |
6128 | if (cur_nr_packets >= reg_chan->num_subbuf) { |
6129 | /* | |
6130 | * Don't take channel into account if we | |
6131 | * already grab all its packets. | |
6132 | */ | |
6133 | continue; | |
6134 | } | |
6135 | tot_size += reg_chan->subbuf_size * reg_chan->stream_count; | |
5c786ded | 6136 | } |
b7064eaa | 6137 | rcu_read_unlock(); |
5c786ded JD |
6138 | } |
6139 | break; | |
6140 | } | |
6141 | case LTTNG_BUFFER_PER_PID: | |
6142 | { | |
6143 | rcu_read_lock(); | |
6144 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6145 | struct ust_app_channel *ua_chan; | |
6146 | struct ust_app_session *ua_sess; | |
6147 | struct lttng_ht_iter chan_iter; | |
6148 | ||
6149 | ua_sess = lookup_session_by_app(usess, app); | |
6150 | if (!ua_sess) { | |
6151 | /* Session not associated with this app. */ | |
6152 | continue; | |
6153 | } | |
6154 | ||
6155 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
6156 | ua_chan, node.node) { | |
d07ceecd MD |
6157 | if (cur_nr_packets >= ua_chan->attr.num_subbuf) { |
6158 | /* | |
6159 | * Don't take channel into account if we | |
6160 | * already grab all its packets. | |
6161 | */ | |
6162 | continue; | |
6163 | } | |
6164 | tot_size += ua_chan->attr.subbuf_size * ua_chan->streams.count; | |
5c786ded JD |
6165 | } |
6166 | } | |
6167 | rcu_read_unlock(); | |
6168 | break; | |
6169 | } | |
6170 | default: | |
6171 | assert(0); | |
6172 | break; | |
6173 | } | |
6174 | ||
d07ceecd | 6175 | return tot_size; |
5c786ded | 6176 | } |
fb83fe64 JD |
6177 | |
6178 | int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id, | |
6179 | struct cds_list_head *buffer_reg_uid_list, | |
6180 | struct consumer_output *consumer, uint64_t uchan_id, | |
6181 | int overwrite, uint64_t *discarded, uint64_t *lost) | |
6182 | { | |
6183 | int ret; | |
6184 | uint64_t consumer_chan_key; | |
6185 | ||
70dd8162 MD |
6186 | *discarded = 0; |
6187 | *lost = 0; | |
6188 | ||
fb83fe64 | 6189 | ret = buffer_reg_uid_consumer_channel_key( |
76604852 | 6190 | buffer_reg_uid_list, uchan_id, &consumer_chan_key); |
fb83fe64 | 6191 | if (ret < 0) { |
70dd8162 MD |
6192 | /* Not found */ |
6193 | ret = 0; | |
fb83fe64 JD |
6194 | goto end; |
6195 | } | |
6196 | ||
6197 | if (overwrite) { | |
6198 | ret = consumer_get_lost_packets(ust_session_id, | |
6199 | consumer_chan_key, consumer, lost); | |
6200 | } else { | |
6201 | ret = consumer_get_discarded_events(ust_session_id, | |
6202 | consumer_chan_key, consumer, discarded); | |
6203 | } | |
6204 | ||
6205 | end: | |
6206 | return ret; | |
6207 | } | |
6208 | ||
6209 | int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess, | |
6210 | struct ltt_ust_channel *uchan, | |
6211 | struct consumer_output *consumer, int overwrite, | |
6212 | uint64_t *discarded, uint64_t *lost) | |
6213 | { | |
6214 | int ret = 0; | |
6215 | struct lttng_ht_iter iter; | |
6216 | struct lttng_ht_node_str *ua_chan_node; | |
6217 | struct ust_app *app; | |
6218 | struct ust_app_session *ua_sess; | |
6219 | struct ust_app_channel *ua_chan; | |
6220 | ||
70dd8162 MD |
6221 | *discarded = 0; |
6222 | *lost = 0; | |
6223 | ||
fb83fe64 JD |
6224 | rcu_read_lock(); |
6225 | /* | |
70dd8162 MD |
6226 | * Iterate over every registered applications. Sum counters for |
6227 | * all applications containing requested session and channel. | |
fb83fe64 JD |
6228 | */ |
6229 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6230 | struct lttng_ht_iter uiter; | |
6231 | ||
6232 | ua_sess = lookup_session_by_app(usess, app); | |
6233 | if (ua_sess == NULL) { | |
6234 | continue; | |
6235 | } | |
6236 | ||
6237 | /* Get channel */ | |
ee022399 | 6238 | lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &uiter); |
fb83fe64 JD |
6239 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); |
6240 | /* If the session is found for the app, the channel must be there */ | |
6241 | assert(ua_chan_node); | |
6242 | ||
6243 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
6244 | ||
6245 | if (overwrite) { | |
70dd8162 MD |
6246 | uint64_t _lost; |
6247 | ||
fb83fe64 | 6248 | ret = consumer_get_lost_packets(usess->id, ua_chan->key, |
70dd8162 MD |
6249 | consumer, &_lost); |
6250 | if (ret < 0) { | |
6251 | break; | |
6252 | } | |
6253 | (*lost) += _lost; | |
fb83fe64 | 6254 | } else { |
70dd8162 MD |
6255 | uint64_t _discarded; |
6256 | ||
fb83fe64 | 6257 | ret = consumer_get_discarded_events(usess->id, |
70dd8162 MD |
6258 | ua_chan->key, consumer, &_discarded); |
6259 | if (ret < 0) { | |
6260 | break; | |
6261 | } | |
6262 | (*discarded) += _discarded; | |
fb83fe64 | 6263 | } |
fb83fe64 JD |
6264 | } |
6265 | ||
fb83fe64 JD |
6266 | rcu_read_unlock(); |
6267 | return ret; | |
6268 | } | |
c2561365 JD |
6269 | |
6270 | static | |
6271 | int ust_app_regenerate_statedump(struct ltt_ust_session *usess, | |
6272 | struct ust_app *app) | |
6273 | { | |
6274 | int ret = 0; | |
6275 | struct ust_app_session *ua_sess; | |
6276 | ||
6277 | DBG("Regenerating the metadata for ust app pid %d", app->pid); | |
6278 | ||
6279 | rcu_read_lock(); | |
6280 | ||
6281 | ua_sess = lookup_session_by_app(usess, app); | |
6282 | if (ua_sess == NULL) { | |
6283 | /* The session is in teardown process. Ignore and continue. */ | |
6284 | goto end; | |
6285 | } | |
6286 | ||
6287 | pthread_mutex_lock(&ua_sess->lock); | |
6288 | ||
6289 | if (ua_sess->deleted) { | |
6290 | goto end_unlock; | |
6291 | } | |
6292 | ||
6293 | pthread_mutex_lock(&app->sock_lock); | |
6294 | ret = ustctl_regenerate_statedump(app->sock, ua_sess->handle); | |
6295 | pthread_mutex_unlock(&app->sock_lock); | |
6296 | ||
6297 | end_unlock: | |
6298 | pthread_mutex_unlock(&ua_sess->lock); | |
6299 | ||
6300 | end: | |
6301 | rcu_read_unlock(); | |
6302 | health_code_update(); | |
6303 | return ret; | |
6304 | } | |
6305 | ||
6306 | /* | |
6307 | * Regenerate the statedump for each app in the session. | |
6308 | */ | |
6309 | int ust_app_regenerate_statedump_all(struct ltt_ust_session *usess) | |
6310 | { | |
6311 | int ret = 0; | |
6312 | struct lttng_ht_iter iter; | |
6313 | struct ust_app *app; | |
6314 | ||
6315 | DBG("Regenerating the metadata for all UST apps"); | |
6316 | ||
6317 | rcu_read_lock(); | |
6318 | ||
6319 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6320 | if (!app->compatible) { | |
6321 | continue; | |
6322 | } | |
6323 | ||
6324 | ret = ust_app_regenerate_statedump(usess, app); | |
6325 | if (ret < 0) { | |
6326 | /* Continue to the next app even on error */ | |
6327 | continue; | |
6328 | } | |
6329 | } | |
6330 | ||
6331 | rcu_read_unlock(); | |
6332 | ||
6333 | return 0; | |
6334 | } | |
5c408ad8 JD |
6335 | |
6336 | /* | |
6337 | * Rotate all the channels of a session. | |
6338 | * | |
6339 | * Return 0 on success or else a negative value. | |
6340 | */ | |
92816cc3 | 6341 | int ust_app_rotate_session(struct ltt_session *session) |
5c408ad8 JD |
6342 | { |
6343 | int ret = 0; | |
6344 | struct lttng_ht_iter iter; | |
6345 | struct ust_app *app; | |
6346 | struct ltt_ust_session *usess = session->ust_session; | |
6347 | char pathname[LTTNG_PATH_MAX]; | |
6348 | ||
6349 | assert(usess); | |
6350 | ||
6351 | rcu_read_lock(); | |
6352 | ||
6353 | switch (usess->buffer_type) { | |
6354 | case LTTNG_BUFFER_PER_UID: | |
6355 | { | |
6356 | struct buffer_reg_uid *reg; | |
6357 | ||
6358 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
6359 | struct buffer_reg_channel *reg_chan; | |
6360 | struct consumer_socket *socket; | |
6361 | ||
6362 | /* Get consumer socket to use to push the metadata.*/ | |
6363 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
6364 | usess->consumer); | |
6365 | if (!socket) { | |
6366 | ret = -EINVAL; | |
6367 | goto error; | |
6368 | } | |
6369 | ||
5c408ad8 JD |
6370 | ret = snprintf(pathname, sizeof(pathname), |
6371 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH, | |
6372 | reg->uid, reg->bits_per_long); | |
6373 | if (ret < 0 || ret == sizeof(pathname)) { | |
6374 | PERROR("Failed to format rotation path"); | |
6375 | goto error; | |
6376 | } | |
6377 | ||
6378 | /* Rotate the data channels. */ | |
6379 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
6380 | reg_chan, node.node) { | |
5c408ad8 JD |
6381 | ret = consumer_rotate_channel(socket, |
6382 | reg_chan->consumer_key, | |
6383 | usess->uid, usess->gid, | |
6384 | usess->consumer, pathname, | |
6385 | /* is_metadata_channel */ false, | |
92816cc3 | 6386 | session->current_archive_id); |
5c408ad8 JD |
6387 | if (ret < 0) { |
6388 | goto error; | |
6389 | } | |
6390 | } | |
6391 | ||
6392 | (void) push_metadata(reg->registry->reg.ust, usess->consumer); | |
6393 | ||
6394 | ret = consumer_rotate_channel(socket, | |
6395 | reg->registry->reg.ust->metadata_key, | |
6396 | usess->uid, usess->gid, | |
6397 | usess->consumer, pathname, | |
6398 | /* is_metadata_channel */ true, | |
92816cc3 | 6399 | session->current_archive_id); |
5c408ad8 JD |
6400 | if (ret < 0) { |
6401 | goto error; | |
6402 | } | |
5c408ad8 JD |
6403 | } |
6404 | break; | |
6405 | } | |
6406 | case LTTNG_BUFFER_PER_PID: | |
6407 | { | |
6408 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6409 | struct consumer_socket *socket; | |
6410 | struct lttng_ht_iter chan_iter; | |
6411 | struct ust_app_channel *ua_chan; | |
6412 | struct ust_app_session *ua_sess; | |
6413 | struct ust_registry_session *registry; | |
6414 | ||
6415 | ua_sess = lookup_session_by_app(usess, app); | |
6416 | if (!ua_sess) { | |
6417 | /* Session not associated with this app. */ | |
6418 | continue; | |
6419 | } | |
6420 | ret = snprintf(pathname, sizeof(pathname), | |
6421 | DEFAULT_UST_TRACE_DIR "/%s", | |
6422 | ua_sess->path); | |
6423 | if (ret < 0 || ret == sizeof(pathname)) { | |
6424 | PERROR("Failed to format rotation path"); | |
6425 | goto error; | |
6426 | } | |
6427 | ||
6428 | /* Get the right consumer socket for the application. */ | |
6429 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
6430 | usess->consumer); | |
6431 | if (!socket) { | |
6432 | ret = -EINVAL; | |
6433 | goto error; | |
6434 | } | |
6435 | ||
6436 | registry = get_session_registry(ua_sess); | |
6437 | if (!registry) { | |
61539f96 | 6438 | DBG("Application session is being torn down. Abort session rotation."); |
5c408ad8 JD |
6439 | ret = -1; |
6440 | goto error; | |
6441 | } | |
6442 | ||
5c408ad8 JD |
6443 | |
6444 | /* Rotate the data channels. */ | |
6445 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
6446 | ua_chan, node.node) { | |
5c408ad8 JD |
6447 | ret = consumer_rotate_channel(socket, ua_chan->key, |
6448 | ua_sess->euid, ua_sess->egid, | |
6449 | ua_sess->consumer, pathname, | |
6450 | /* is_metadata_channel */ false, | |
92816cc3 | 6451 | session->current_archive_id); |
5c408ad8 JD |
6452 | if (ret < 0) { |
6453 | goto error; | |
6454 | } | |
6455 | } | |
6456 | ||
6457 | /* Rotate the metadata channel. */ | |
6458 | (void) push_metadata(registry, usess->consumer); | |
6459 | ret = consumer_rotate_channel(socket, registry->metadata_key, | |
6460 | ua_sess->euid, ua_sess->egid, | |
6461 | ua_sess->consumer, pathname, | |
6462 | /* is_metadata_channel */ true, | |
92816cc3 | 6463 | session->current_archive_id); |
5c408ad8 JD |
6464 | if (ret < 0) { |
6465 | goto error; | |
6466 | } | |
5c408ad8 JD |
6467 | } |
6468 | break; | |
6469 | } | |
6470 | default: | |
6471 | assert(0); | |
6472 | break; | |
6473 | } | |
6474 | ||
6475 | ret = LTTNG_OK; | |
6476 | ||
6477 | error: | |
6478 | rcu_read_unlock(); | |
6479 | return ret; | |
6480 | } |