Commit | Line | Data |
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91d76f53 DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
bdf64013 | 3 | * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
91d76f53 | 4 | * |
d14d33bf AM |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
91d76f53 DG |
8 | * |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
d14d33bf AM |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
91d76f53 DG |
17 | */ |
18 | ||
6c1c0768 | 19 | #define _LGPL_SOURCE |
91d76f53 | 20 | #include <errno.h> |
7972aab2 | 21 | #include <inttypes.h> |
91d76f53 DG |
22 | #include <pthread.h> |
23 | #include <stdio.h> | |
24 | #include <stdlib.h> | |
099e26bd | 25 | #include <string.h> |
aba8e916 DG |
26 | #include <sys/stat.h> |
27 | #include <sys/types.h> | |
099e26bd | 28 | #include <unistd.h> |
0df502fd | 29 | #include <urcu/compiler.h> |
fb54cdbf | 30 | #include <lttng/ust-error.h> |
331744e3 | 31 | #include <signal.h> |
bec39940 | 32 | |
990570ed | 33 | #include <common/common.h> |
86acf0da | 34 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 35 | |
7972aab2 | 36 | #include "buffer-registry.h" |
86acf0da | 37 | #include "fd-limit.h" |
8782cc74 | 38 | #include "health-sessiond.h" |
56fff090 | 39 | #include "ust-app.h" |
48842b30 | 40 | #include "ust-consumer.h" |
d80a6244 | 41 | #include "ust-ctl.h" |
0b2dc8df | 42 | #include "utils.h" |
fb83fe64 | 43 | #include "session.h" |
e9404c27 JG |
44 | #include "lttng-sessiond.h" |
45 | #include "notification-thread-commands.h" | |
d80a6244 | 46 | |
c4b88406 MD |
47 | static |
48 | int ust_app_flush_app_session(struct ust_app *app, struct ust_app_session *ua_sess); | |
49 | ||
d9bf3ca4 MD |
50 | /* Next available channel key. Access under next_channel_key_lock. */ |
51 | static uint64_t _next_channel_key; | |
52 | static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER; | |
53 | ||
54 | /* Next available session ID. Access under next_session_id_lock. */ | |
55 | static uint64_t _next_session_id; | |
56 | static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER; | |
ffe60014 DG |
57 | |
58 | /* | |
d9bf3ca4 | 59 | * Return the incremented value of next_channel_key. |
ffe60014 | 60 | */ |
d9bf3ca4 | 61 | static uint64_t get_next_channel_key(void) |
ffe60014 | 62 | { |
d9bf3ca4 MD |
63 | uint64_t ret; |
64 | ||
65 | pthread_mutex_lock(&next_channel_key_lock); | |
66 | ret = ++_next_channel_key; | |
67 | pthread_mutex_unlock(&next_channel_key_lock); | |
68 | return ret; | |
ffe60014 DG |
69 | } |
70 | ||
71 | /* | |
7972aab2 | 72 | * Return the atomically incremented value of next_session_id. |
ffe60014 | 73 | */ |
d9bf3ca4 | 74 | static uint64_t get_next_session_id(void) |
ffe60014 | 75 | { |
d9bf3ca4 MD |
76 | uint64_t ret; |
77 | ||
78 | pthread_mutex_lock(&next_session_id_lock); | |
79 | ret = ++_next_session_id; | |
80 | pthread_mutex_unlock(&next_session_id_lock); | |
81 | return ret; | |
ffe60014 DG |
82 | } |
83 | ||
d65d2de8 DG |
84 | static void copy_channel_attr_to_ustctl( |
85 | struct ustctl_consumer_channel_attr *attr, | |
86 | struct lttng_ust_channel_attr *uattr) | |
87 | { | |
88 | /* Copy event attributes since the layout is different. */ | |
89 | attr->subbuf_size = uattr->subbuf_size; | |
90 | attr->num_subbuf = uattr->num_subbuf; | |
91 | attr->overwrite = uattr->overwrite; | |
92 | attr->switch_timer_interval = uattr->switch_timer_interval; | |
93 | attr->read_timer_interval = uattr->read_timer_interval; | |
94 | attr->output = uattr->output; | |
491d1539 | 95 | attr->blocking_timeout = uattr->u.s.blocking_timeout; |
d65d2de8 DG |
96 | } |
97 | ||
025faf73 DG |
98 | /* |
99 | * Match function for the hash table lookup. | |
100 | * | |
101 | * It matches an ust app event based on three attributes which are the event | |
102 | * name, the filter bytecode and the loglevel. | |
103 | */ | |
18eace3b DG |
104 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
105 | { | |
106 | struct ust_app_event *event; | |
107 | const struct ust_app_ht_key *key; | |
2106efa0 | 108 | int ev_loglevel_value; |
18eace3b DG |
109 | |
110 | assert(node); | |
111 | assert(_key); | |
112 | ||
113 | event = caa_container_of(node, struct ust_app_event, node.node); | |
114 | key = _key; | |
2106efa0 | 115 | ev_loglevel_value = event->attr.loglevel; |
18eace3b | 116 | |
1af53eb5 | 117 | /* Match the 4 elements of the key: name, filter, loglevel, exclusions */ |
18eace3b DG |
118 | |
119 | /* Event name */ | |
120 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
121 | goto no_match; | |
122 | } | |
123 | ||
124 | /* Event loglevel. */ | |
2106efa0 | 125 | if (ev_loglevel_value != key->loglevel_type) { |
025faf73 | 126 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
2106efa0 PP |
127 | && key->loglevel_type == 0 && |
128 | ev_loglevel_value == -1) { | |
025faf73 DG |
129 | /* |
130 | * Match is accepted. This is because on event creation, the | |
131 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
132 | * -1 are accepted for this loglevel type since 0 is the one set by | |
133 | * the API when receiving an enable event. | |
134 | */ | |
135 | } else { | |
136 | goto no_match; | |
137 | } | |
18eace3b DG |
138 | } |
139 | ||
140 | /* One of the filters is NULL, fail. */ | |
141 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
142 | goto no_match; | |
143 | } | |
144 | ||
025faf73 DG |
145 | if (key->filter && event->filter) { |
146 | /* Both filters exists, check length followed by the bytecode. */ | |
147 | if (event->filter->len != key->filter->len || | |
148 | memcmp(event->filter->data, key->filter->data, | |
149 | event->filter->len) != 0) { | |
150 | goto no_match; | |
151 | } | |
18eace3b DG |
152 | } |
153 | ||
1af53eb5 JI |
154 | /* One of the exclusions is NULL, fail. */ |
155 | if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) { | |
156 | goto no_match; | |
157 | } | |
158 | ||
159 | if (key->exclusion && event->exclusion) { | |
160 | /* Both exclusions exists, check count followed by the names. */ | |
161 | if (event->exclusion->count != key->exclusion->count || | |
162 | memcmp(event->exclusion->names, key->exclusion->names, | |
163 | event->exclusion->count * LTTNG_UST_SYM_NAME_LEN) != 0) { | |
164 | goto no_match; | |
165 | } | |
166 | } | |
167 | ||
168 | ||
025faf73 | 169 | /* Match. */ |
18eace3b DG |
170 | return 1; |
171 | ||
172 | no_match: | |
173 | return 0; | |
18eace3b DG |
174 | } |
175 | ||
025faf73 DG |
176 | /* |
177 | * Unique add of an ust app event in the given ht. This uses the custom | |
178 | * ht_match_ust_app_event match function and the event name as hash. | |
179 | */ | |
d0b96690 | 180 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
181 | struct ust_app_event *event) |
182 | { | |
183 | struct cds_lfht_node *node_ptr; | |
184 | struct ust_app_ht_key key; | |
d0b96690 | 185 | struct lttng_ht *ht; |
18eace3b | 186 | |
d0b96690 DG |
187 | assert(ua_chan); |
188 | assert(ua_chan->events); | |
18eace3b DG |
189 | assert(event); |
190 | ||
d0b96690 | 191 | ht = ua_chan->events; |
18eace3b DG |
192 | key.name = event->attr.name; |
193 | key.filter = event->filter; | |
2106efa0 | 194 | key.loglevel_type = event->attr.loglevel; |
91c89f23 | 195 | key.exclusion = event->exclusion; |
18eace3b DG |
196 | |
197 | node_ptr = cds_lfht_add_unique(ht->ht, | |
198 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
199 | ht_match_ust_app_event, &key, &event->node.node); | |
200 | assert(node_ptr == &event->node.node); | |
201 | } | |
202 | ||
d88aee68 DG |
203 | /* |
204 | * Close the notify socket from the given RCU head object. This MUST be called | |
205 | * through a call_rcu(). | |
206 | */ | |
207 | static void close_notify_sock_rcu(struct rcu_head *head) | |
208 | { | |
209 | int ret; | |
210 | struct ust_app_notify_sock_obj *obj = | |
211 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
212 | ||
213 | /* Must have a valid fd here. */ | |
214 | assert(obj->fd >= 0); | |
215 | ||
216 | ret = close(obj->fd); | |
217 | if (ret) { | |
218 | ERR("close notify sock %d RCU", obj->fd); | |
219 | } | |
220 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
221 | ||
222 | free(obj); | |
223 | } | |
224 | ||
7972aab2 DG |
225 | /* |
226 | * Return the session registry according to the buffer type of the given | |
227 | * session. | |
228 | * | |
229 | * A registry per UID object MUST exists before calling this function or else | |
230 | * it assert() if not found. RCU read side lock must be acquired. | |
231 | */ | |
232 | static struct ust_registry_session *get_session_registry( | |
233 | struct ust_app_session *ua_sess) | |
234 | { | |
235 | struct ust_registry_session *registry = NULL; | |
236 | ||
237 | assert(ua_sess); | |
238 | ||
239 | switch (ua_sess->buffer_type) { | |
240 | case LTTNG_BUFFER_PER_PID: | |
241 | { | |
242 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
243 | if (!reg_pid) { | |
244 | goto error; | |
245 | } | |
246 | registry = reg_pid->registry->reg.ust; | |
247 | break; | |
248 | } | |
249 | case LTTNG_BUFFER_PER_UID: | |
250 | { | |
251 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
252 | ua_sess->tracing_id, ua_sess->bits_per_long, ua_sess->uid); | |
253 | if (!reg_uid) { | |
254 | goto error; | |
255 | } | |
256 | registry = reg_uid->registry->reg.ust; | |
257 | break; | |
258 | } | |
259 | default: | |
260 | assert(0); | |
261 | }; | |
262 | ||
263 | error: | |
264 | return registry; | |
265 | } | |
266 | ||
55cc08a6 DG |
267 | /* |
268 | * Delete ust context safely. RCU read lock must be held before calling | |
269 | * this function. | |
270 | */ | |
271 | static | |
fb45065e MD |
272 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx, |
273 | struct ust_app *app) | |
55cc08a6 | 274 | { |
ffe60014 DG |
275 | int ret; |
276 | ||
277 | assert(ua_ctx); | |
278 | ||
55cc08a6 | 279 | if (ua_ctx->obj) { |
fb45065e | 280 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 281 | ret = ustctl_release_object(sock, ua_ctx->obj); |
fb45065e | 282 | pthread_mutex_unlock(&app->sock_lock); |
d0b96690 DG |
283 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
284 | ERR("UST app sock %d release ctx obj handle %d failed with ret %d", | |
285 | sock, ua_ctx->obj->handle, ret); | |
ffe60014 | 286 | } |
55cc08a6 DG |
287 | free(ua_ctx->obj); |
288 | } | |
289 | free(ua_ctx); | |
290 | } | |
291 | ||
d80a6244 DG |
292 | /* |
293 | * Delete ust app event safely. RCU read lock must be held before calling | |
294 | * this function. | |
295 | */ | |
8b366481 | 296 | static |
fb45065e MD |
297 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event, |
298 | struct ust_app *app) | |
d80a6244 | 299 | { |
ffe60014 DG |
300 | int ret; |
301 | ||
302 | assert(ua_event); | |
303 | ||
53a80697 | 304 | free(ua_event->filter); |
951f0b71 JI |
305 | if (ua_event->exclusion != NULL) |
306 | free(ua_event->exclusion); | |
edb67388 | 307 | if (ua_event->obj != NULL) { |
fb45065e | 308 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 309 | ret = ustctl_release_object(sock, ua_event->obj); |
fb45065e | 310 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
311 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
312 | ERR("UST app sock %d release event obj failed with ret %d", | |
313 | sock, ret); | |
314 | } | |
edb67388 DG |
315 | free(ua_event->obj); |
316 | } | |
d80a6244 DG |
317 | free(ua_event); |
318 | } | |
319 | ||
320 | /* | |
7972aab2 DG |
321 | * Release ust data object of the given stream. |
322 | * | |
323 | * Return 0 on success or else a negative value. | |
d80a6244 | 324 | */ |
fb45065e MD |
325 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream, |
326 | struct ust_app *app) | |
d80a6244 | 327 | { |
7972aab2 | 328 | int ret = 0; |
ffe60014 DG |
329 | |
330 | assert(stream); | |
331 | ||
8b366481 | 332 | if (stream->obj) { |
fb45065e | 333 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 334 | ret = ustctl_release_object(sock, stream->obj); |
fb45065e | 335 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
336 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
337 | ERR("UST app sock %d release stream obj failed with ret %d", | |
338 | sock, ret); | |
339 | } | |
4063050c | 340 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
341 | free(stream->obj); |
342 | } | |
7972aab2 DG |
343 | |
344 | return ret; | |
345 | } | |
346 | ||
347 | /* | |
348 | * Delete ust app stream safely. RCU read lock must be held before calling | |
349 | * this function. | |
350 | */ | |
351 | static | |
fb45065e MD |
352 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream, |
353 | struct ust_app *app) | |
7972aab2 DG |
354 | { |
355 | assert(stream); | |
356 | ||
fb45065e | 357 | (void) release_ust_app_stream(sock, stream, app); |
84cd17c6 | 358 | free(stream); |
d80a6244 DG |
359 | } |
360 | ||
36b588ed MD |
361 | /* |
362 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
363 | * section and outside of call_rcu thread, so we postpone its execution |
364 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
365 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
366 | */ |
367 | static | |
368 | void delete_ust_app_channel_rcu(struct rcu_head *head) | |
369 | { | |
370 | struct ust_app_channel *ua_chan = | |
371 | caa_container_of(head, struct ust_app_channel, rcu_head); | |
372 | ||
0b2dc8df MD |
373 | ht_cleanup_push(ua_chan->ctx); |
374 | ht_cleanup_push(ua_chan->events); | |
36b588ed MD |
375 | free(ua_chan); |
376 | } | |
377 | ||
fb83fe64 JD |
378 | /* |
379 | * Extract the lost packet or discarded events counter when the channel is | |
380 | * being deleted and store the value in the parent channel so we can | |
381 | * access it from lttng list and at stop/destroy. | |
82cac6d2 JG |
382 | * |
383 | * The session list lock must be held by the caller. | |
fb83fe64 JD |
384 | */ |
385 | static | |
386 | void save_per_pid_lost_discarded_counters(struct ust_app_channel *ua_chan) | |
387 | { | |
388 | uint64_t discarded = 0, lost = 0; | |
389 | struct ltt_session *session; | |
390 | struct ltt_ust_channel *uchan; | |
391 | ||
392 | if (ua_chan->attr.type != LTTNG_UST_CHAN_PER_CPU) { | |
393 | return; | |
394 | } | |
395 | ||
396 | rcu_read_lock(); | |
397 | session = session_find_by_id(ua_chan->session->tracing_id); | |
d68ec974 JG |
398 | if (!session || !session->ust_session) { |
399 | /* | |
400 | * Not finding the session is not an error because there are | |
401 | * multiple ways the channels can be torn down. | |
402 | * | |
403 | * 1) The session daemon can initiate the destruction of the | |
404 | * ust app session after receiving a destroy command or | |
405 | * during its shutdown/teardown. | |
406 | * 2) The application, since we are in per-pid tracing, is | |
407 | * unregistering and tearing down its ust app session. | |
408 | * | |
409 | * Both paths are protected by the session list lock which | |
410 | * ensures that the accounting of lost packets and discarded | |
411 | * events is done exactly once. The session is then unpublished | |
412 | * from the session list, resulting in this condition. | |
413 | */ | |
fb83fe64 JD |
414 | goto end; |
415 | } | |
416 | ||
417 | if (ua_chan->attr.overwrite) { | |
418 | consumer_get_lost_packets(ua_chan->session->tracing_id, | |
419 | ua_chan->key, session->ust_session->consumer, | |
420 | &lost); | |
421 | } else { | |
422 | consumer_get_discarded_events(ua_chan->session->tracing_id, | |
423 | ua_chan->key, session->ust_session->consumer, | |
424 | &discarded); | |
425 | } | |
426 | uchan = trace_ust_find_channel_by_name( | |
427 | session->ust_session->domain_global.channels, | |
428 | ua_chan->name); | |
429 | if (!uchan) { | |
430 | ERR("Missing UST channel to store discarded counters"); | |
431 | goto end; | |
432 | } | |
433 | ||
434 | uchan->per_pid_closed_app_discarded += discarded; | |
435 | uchan->per_pid_closed_app_lost += lost; | |
436 | ||
437 | end: | |
438 | rcu_read_unlock(); | |
439 | } | |
440 | ||
d80a6244 DG |
441 | /* |
442 | * Delete ust app channel safely. RCU read lock must be held before calling | |
443 | * this function. | |
82cac6d2 JG |
444 | * |
445 | * The session list lock must be held by the caller. | |
d80a6244 | 446 | */ |
8b366481 | 447 | static |
d0b96690 DG |
448 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
449 | struct ust_app *app) | |
d80a6244 DG |
450 | { |
451 | int ret; | |
bec39940 | 452 | struct lttng_ht_iter iter; |
d80a6244 | 453 | struct ust_app_event *ua_event; |
55cc08a6 | 454 | struct ust_app_ctx *ua_ctx; |
030a66fa | 455 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 456 | struct ust_registry_session *registry; |
d80a6244 | 457 | |
ffe60014 DG |
458 | assert(ua_chan); |
459 | ||
460 | DBG3("UST app deleting channel %s", ua_chan->name); | |
461 | ||
55cc08a6 | 462 | /* Wipe stream */ |
d80a6244 | 463 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 464 | cds_list_del(&stream->list); |
fb45065e | 465 | delete_ust_app_stream(sock, stream, app); |
d80a6244 DG |
466 | } |
467 | ||
55cc08a6 | 468 | /* Wipe context */ |
bec39940 | 469 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
31746f93 | 470 | cds_list_del(&ua_ctx->list); |
bec39940 | 471 | ret = lttng_ht_del(ua_chan->ctx, &iter); |
55cc08a6 | 472 | assert(!ret); |
fb45065e | 473 | delete_ust_app_ctx(sock, ua_ctx, app); |
55cc08a6 | 474 | } |
d80a6244 | 475 | |
55cc08a6 | 476 | /* Wipe events */ |
bec39940 DG |
477 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
478 | node.node) { | |
479 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 480 | assert(!ret); |
fb45065e | 481 | delete_ust_app_event(sock, ua_event, app); |
d80a6244 | 482 | } |
edb67388 | 483 | |
c8335706 MD |
484 | if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) { |
485 | /* Wipe and free registry from session registry. */ | |
486 | registry = get_session_registry(ua_chan->session); | |
487 | if (registry) { | |
e9404c27 JG |
488 | ust_registry_channel_del_free(registry, ua_chan->key, |
489 | true); | |
c8335706 | 490 | } |
fb83fe64 | 491 | save_per_pid_lost_discarded_counters(ua_chan); |
7972aab2 | 492 | } |
d0b96690 | 493 | |
edb67388 | 494 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
495 | /* Remove channel from application UST object descriptor. */ |
496 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
c6e62271 DG |
497 | ret = lttng_ht_del(app->ust_objd, &iter); |
498 | assert(!ret); | |
fb45065e | 499 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 500 | ret = ustctl_release_object(sock, ua_chan->obj); |
fb45065e | 501 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
502 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
503 | ERR("UST app sock %d release channel obj failed with ret %d", | |
504 | sock, ret); | |
505 | } | |
7972aab2 | 506 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
507 | free(ua_chan->obj); |
508 | } | |
36b588ed | 509 | call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); |
d80a6244 DG |
510 | } |
511 | ||
fb45065e MD |
512 | int ust_app_register_done(struct ust_app *app) |
513 | { | |
514 | int ret; | |
515 | ||
516 | pthread_mutex_lock(&app->sock_lock); | |
517 | ret = ustctl_register_done(app->sock); | |
518 | pthread_mutex_unlock(&app->sock_lock); | |
519 | return ret; | |
520 | } | |
521 | ||
522 | int ust_app_release_object(struct ust_app *app, struct lttng_ust_object_data *data) | |
523 | { | |
524 | int ret, sock; | |
525 | ||
526 | if (app) { | |
527 | pthread_mutex_lock(&app->sock_lock); | |
528 | sock = app->sock; | |
529 | } else { | |
530 | sock = -1; | |
531 | } | |
532 | ret = ustctl_release_object(sock, data); | |
533 | if (app) { | |
534 | pthread_mutex_unlock(&app->sock_lock); | |
535 | } | |
536 | return ret; | |
537 | } | |
538 | ||
331744e3 | 539 | /* |
1b532a60 DG |
540 | * Push metadata to consumer socket. |
541 | * | |
dc2bbdae MD |
542 | * RCU read-side lock must be held to guarantee existance of socket. |
543 | * Must be called with the ust app session lock held. | |
544 | * Must be called with the registry lock held. | |
331744e3 JD |
545 | * |
546 | * On success, return the len of metadata pushed or else a negative value. | |
2c57e06d MD |
547 | * Returning a -EPIPE return value means we could not send the metadata, |
548 | * but it can be caused by recoverable errors (e.g. the application has | |
549 | * terminated concurrently). | |
331744e3 JD |
550 | */ |
551 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
552 | struct consumer_socket *socket, int send_zero_data) | |
553 | { | |
554 | int ret; | |
555 | char *metadata_str = NULL; | |
c585821b | 556 | size_t len, offset, new_metadata_len_sent; |
331744e3 | 557 | ssize_t ret_val; |
93ec662e | 558 | uint64_t metadata_key, metadata_version; |
331744e3 JD |
559 | |
560 | assert(registry); | |
561 | assert(socket); | |
1b532a60 | 562 | |
c585821b MD |
563 | metadata_key = registry->metadata_key; |
564 | ||
ce34fcd0 | 565 | /* |
dc2bbdae MD |
566 | * Means that no metadata was assigned to the session. This can |
567 | * happens if no start has been done previously. | |
ce34fcd0 | 568 | */ |
c585821b | 569 | if (!metadata_key) { |
ce34fcd0 MD |
570 | return 0; |
571 | } | |
572 | ||
331744e3 JD |
573 | offset = registry->metadata_len_sent; |
574 | len = registry->metadata_len - registry->metadata_len_sent; | |
c585821b | 575 | new_metadata_len_sent = registry->metadata_len; |
93ec662e | 576 | metadata_version = registry->metadata_version; |
331744e3 JD |
577 | if (len == 0) { |
578 | DBG3("No metadata to push for metadata key %" PRIu64, | |
579 | registry->metadata_key); | |
580 | ret_val = len; | |
581 | if (send_zero_data) { | |
582 | DBG("No metadata to push"); | |
583 | goto push_data; | |
584 | } | |
585 | goto end; | |
586 | } | |
587 | ||
588 | /* Allocate only what we have to send. */ | |
589 | metadata_str = zmalloc(len); | |
590 | if (!metadata_str) { | |
591 | PERROR("zmalloc ust app metadata string"); | |
592 | ret_val = -ENOMEM; | |
593 | goto error; | |
594 | } | |
c585821b | 595 | /* Copy what we haven't sent out. */ |
331744e3 | 596 | memcpy(metadata_str, registry->metadata + offset, len); |
331744e3 JD |
597 | |
598 | push_data: | |
c585821b MD |
599 | pthread_mutex_unlock(®istry->lock); |
600 | /* | |
601 | * We need to unlock the registry while we push metadata to | |
602 | * break a circular dependency between the consumerd metadata | |
603 | * lock and the sessiond registry lock. Indeed, pushing metadata | |
604 | * to the consumerd awaits that it gets pushed all the way to | |
605 | * relayd, but doing so requires grabbing the metadata lock. If | |
606 | * a concurrent metadata request is being performed by | |
607 | * consumerd, this can try to grab the registry lock on the | |
608 | * sessiond while holding the metadata lock on the consumer | |
609 | * daemon. Those push and pull schemes are performed on two | |
610 | * different bidirectionnal communication sockets. | |
611 | */ | |
612 | ret = consumer_push_metadata(socket, metadata_key, | |
93ec662e | 613 | metadata_str, len, offset, metadata_version); |
c585821b | 614 | pthread_mutex_lock(®istry->lock); |
331744e3 | 615 | if (ret < 0) { |
000baf6a | 616 | /* |
dc2bbdae MD |
617 | * There is an acceptable race here between the registry |
618 | * metadata key assignment and the creation on the | |
619 | * consumer. The session daemon can concurrently push | |
620 | * metadata for this registry while being created on the | |
621 | * consumer since the metadata key of the registry is | |
622 | * assigned *before* it is setup to avoid the consumer | |
623 | * to ask for metadata that could possibly be not found | |
624 | * in the session daemon. | |
000baf6a | 625 | * |
dc2bbdae MD |
626 | * The metadata will get pushed either by the session |
627 | * being stopped or the consumer requesting metadata if | |
628 | * that race is triggered. | |
000baf6a DG |
629 | */ |
630 | if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) { | |
631 | ret = 0; | |
c585821b MD |
632 | } else { |
633 | ERR("Error pushing metadata to consumer"); | |
000baf6a | 634 | } |
331744e3 JD |
635 | ret_val = ret; |
636 | goto error_push; | |
c585821b MD |
637 | } else { |
638 | /* | |
639 | * Metadata may have been concurrently pushed, since | |
640 | * we're not holding the registry lock while pushing to | |
641 | * consumer. This is handled by the fact that we send | |
642 | * the metadata content, size, and the offset at which | |
643 | * that metadata belongs. This may arrive out of order | |
644 | * on the consumer side, and the consumer is able to | |
645 | * deal with overlapping fragments. The consumer | |
646 | * supports overlapping fragments, which must be | |
647 | * contiguous starting from offset 0. We keep the | |
648 | * largest metadata_len_sent value of the concurrent | |
649 | * send. | |
650 | */ | |
651 | registry->metadata_len_sent = | |
652 | max_t(size_t, registry->metadata_len_sent, | |
653 | new_metadata_len_sent); | |
331744e3 | 654 | } |
331744e3 JD |
655 | free(metadata_str); |
656 | return len; | |
657 | ||
658 | end: | |
659 | error: | |
ce34fcd0 MD |
660 | if (ret_val) { |
661 | /* | |
dc2bbdae MD |
662 | * On error, flag the registry that the metadata is |
663 | * closed. We were unable to push anything and this | |
664 | * means that either the consumer is not responding or | |
665 | * the metadata cache has been destroyed on the | |
666 | * consumer. | |
ce34fcd0 MD |
667 | */ |
668 | registry->metadata_closed = 1; | |
669 | } | |
331744e3 JD |
670 | error_push: |
671 | free(metadata_str); | |
672 | return ret_val; | |
673 | } | |
674 | ||
d88aee68 | 675 | /* |
ce34fcd0 | 676 | * For a given application and session, push metadata to consumer. |
331744e3 JD |
677 | * Either sock or consumer is required : if sock is NULL, the default |
678 | * socket to send the metadata is retrieved from consumer, if sock | |
679 | * is not NULL we use it to send the metadata. | |
ce34fcd0 | 680 | * RCU read-side lock must be held while calling this function, |
dc2bbdae MD |
681 | * therefore ensuring existance of registry. It also ensures existance |
682 | * of socket throughout this function. | |
d88aee68 DG |
683 | * |
684 | * Return 0 on success else a negative error. | |
2c57e06d MD |
685 | * Returning a -EPIPE return value means we could not send the metadata, |
686 | * but it can be caused by recoverable errors (e.g. the application has | |
687 | * terminated concurrently). | |
d88aee68 | 688 | */ |
7972aab2 DG |
689 | static int push_metadata(struct ust_registry_session *registry, |
690 | struct consumer_output *consumer) | |
d88aee68 | 691 | { |
331744e3 JD |
692 | int ret_val; |
693 | ssize_t ret; | |
d88aee68 DG |
694 | struct consumer_socket *socket; |
695 | ||
7972aab2 DG |
696 | assert(registry); |
697 | assert(consumer); | |
698 | ||
ce34fcd0 | 699 | pthread_mutex_lock(®istry->lock); |
ce34fcd0 | 700 | if (registry->metadata_closed) { |
dc2bbdae MD |
701 | ret_val = -EPIPE; |
702 | goto error; | |
d88aee68 DG |
703 | } |
704 | ||
d88aee68 | 705 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
706 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
707 | consumer); | |
d88aee68 | 708 | if (!socket) { |
331744e3 | 709 | ret_val = -1; |
ce34fcd0 | 710 | goto error; |
d88aee68 DG |
711 | } |
712 | ||
331744e3 | 713 | ret = ust_app_push_metadata(registry, socket, 0); |
d88aee68 | 714 | if (ret < 0) { |
331744e3 | 715 | ret_val = ret; |
ce34fcd0 | 716 | goto error; |
d88aee68 | 717 | } |
dc2bbdae | 718 | pthread_mutex_unlock(®istry->lock); |
d88aee68 DG |
719 | return 0; |
720 | ||
ce34fcd0 | 721 | error: |
dc2bbdae | 722 | pthread_mutex_unlock(®istry->lock); |
331744e3 | 723 | return ret_val; |
d88aee68 DG |
724 | } |
725 | ||
726 | /* | |
727 | * Send to the consumer a close metadata command for the given session. Once | |
728 | * done, the metadata channel is deleted and the session metadata pointer is | |
dc2bbdae | 729 | * nullified. The session lock MUST be held unless the application is |
d88aee68 DG |
730 | * in the destroy path. |
731 | * | |
732 | * Return 0 on success else a negative value. | |
733 | */ | |
7972aab2 DG |
734 | static int close_metadata(struct ust_registry_session *registry, |
735 | struct consumer_output *consumer) | |
d88aee68 DG |
736 | { |
737 | int ret; | |
738 | struct consumer_socket *socket; | |
739 | ||
7972aab2 DG |
740 | assert(registry); |
741 | assert(consumer); | |
d88aee68 | 742 | |
7972aab2 DG |
743 | rcu_read_lock(); |
744 | ||
ce34fcd0 MD |
745 | pthread_mutex_lock(®istry->lock); |
746 | ||
7972aab2 | 747 | if (!registry->metadata_key || registry->metadata_closed) { |
d88aee68 | 748 | ret = 0; |
1b532a60 | 749 | goto end; |
d88aee68 DG |
750 | } |
751 | ||
d88aee68 | 752 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
753 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
754 | consumer); | |
d88aee68 DG |
755 | if (!socket) { |
756 | ret = -1; | |
7972aab2 | 757 | goto error; |
d88aee68 DG |
758 | } |
759 | ||
7972aab2 | 760 | ret = consumer_close_metadata(socket, registry->metadata_key); |
d88aee68 | 761 | if (ret < 0) { |
7972aab2 | 762 | goto error; |
d88aee68 DG |
763 | } |
764 | ||
d88aee68 | 765 | error: |
1b532a60 DG |
766 | /* |
767 | * Metadata closed. Even on error this means that the consumer is not | |
768 | * responding or not found so either way a second close should NOT be emit | |
769 | * for this registry. | |
770 | */ | |
771 | registry->metadata_closed = 1; | |
772 | end: | |
ce34fcd0 | 773 | pthread_mutex_unlock(®istry->lock); |
7972aab2 | 774 | rcu_read_unlock(); |
d88aee68 DG |
775 | return ret; |
776 | } | |
777 | ||
36b588ed MD |
778 | /* |
779 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
780 | * section and outside of call_rcu thread, so we postpone its execution |
781 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
782 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
783 | */ |
784 | static | |
785 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
786 | { | |
787 | struct ust_app_session *ua_sess = | |
788 | caa_container_of(head, struct ust_app_session, rcu_head); | |
789 | ||
0b2dc8df | 790 | ht_cleanup_push(ua_sess->channels); |
36b588ed MD |
791 | free(ua_sess); |
792 | } | |
793 | ||
d80a6244 DG |
794 | /* |
795 | * Delete ust app session safely. RCU read lock must be held before calling | |
796 | * this function. | |
82cac6d2 JG |
797 | * |
798 | * The session list lock must be held by the caller. | |
d80a6244 | 799 | */ |
8b366481 | 800 | static |
d0b96690 DG |
801 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
802 | struct ust_app *app) | |
d80a6244 DG |
803 | { |
804 | int ret; | |
bec39940 | 805 | struct lttng_ht_iter iter; |
d80a6244 | 806 | struct ust_app_channel *ua_chan; |
7972aab2 | 807 | struct ust_registry_session *registry; |
d80a6244 | 808 | |
d88aee68 DG |
809 | assert(ua_sess); |
810 | ||
1b532a60 DG |
811 | pthread_mutex_lock(&ua_sess->lock); |
812 | ||
b161602a MD |
813 | assert(!ua_sess->deleted); |
814 | ua_sess->deleted = true; | |
815 | ||
7972aab2 | 816 | registry = get_session_registry(ua_sess); |
fad1ed2f | 817 | /* Registry can be null on error path during initialization. */ |
ce34fcd0 | 818 | if (registry) { |
d88aee68 | 819 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 820 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 821 | |
7972aab2 DG |
822 | /* |
823 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
824 | * metadata only on destroy trace session in this case. Also, the |
825 | * previous push metadata could have flag the metadata registry to | |
826 | * close so don't send a close command if closed. | |
7972aab2 | 827 | */ |
ce34fcd0 | 828 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
829 | /* And ask to close it for this session registry. */ |
830 | (void) close_metadata(registry, ua_sess->consumer); | |
831 | } | |
d80a6244 DG |
832 | } |
833 | ||
bec39940 DG |
834 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
835 | node.node) { | |
836 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 837 | assert(!ret); |
d0b96690 | 838 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 839 | } |
d80a6244 | 840 | |
7972aab2 DG |
841 | /* In case of per PID, the registry is kept in the session. */ |
842 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
843 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
844 | if (reg_pid) { | |
fad1ed2f JR |
845 | /* |
846 | * Registry can be null on error path during | |
847 | * initialization. | |
848 | */ | |
7972aab2 DG |
849 | buffer_reg_pid_remove(reg_pid); |
850 | buffer_reg_pid_destroy(reg_pid); | |
851 | } | |
852 | } | |
d0b96690 | 853 | |
aee6bafd | 854 | if (ua_sess->handle != -1) { |
fb45065e | 855 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 856 | ret = ustctl_release_handle(sock, ua_sess->handle); |
fb45065e | 857 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
858 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
859 | ERR("UST app sock %d release session handle failed with ret %d", | |
860 | sock, ret); | |
861 | } | |
10b56aef MD |
862 | /* Remove session from application UST object descriptor. */ |
863 | iter.iter.node = &ua_sess->ust_objd_node.node; | |
864 | ret = lttng_ht_del(app->ust_sessions_objd, &iter); | |
865 | assert(!ret); | |
aee6bafd | 866 | } |
10b56aef | 867 | |
1b532a60 DG |
868 | pthread_mutex_unlock(&ua_sess->lock); |
869 | ||
6addfa37 MD |
870 | consumer_output_put(ua_sess->consumer); |
871 | ||
36b588ed | 872 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 873 | } |
91d76f53 DG |
874 | |
875 | /* | |
284d8f55 DG |
876 | * Delete a traceable application structure from the global list. Never call |
877 | * this function outside of a call_rcu call. | |
36b588ed MD |
878 | * |
879 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 880 | */ |
8b366481 DG |
881 | static |
882 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 883 | { |
8b366481 | 884 | int ret, sock; |
d42f20df | 885 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 886 | |
82cac6d2 JG |
887 | /* |
888 | * The session list lock must be held during this function to guarantee | |
889 | * the existence of ua_sess. | |
890 | */ | |
891 | session_lock_list(); | |
d80a6244 | 892 | /* Delete ust app sessions info */ |
852d0037 DG |
893 | sock = app->sock; |
894 | app->sock = -1; | |
d80a6244 | 895 | |
8b366481 | 896 | /* Wipe sessions */ |
d42f20df DG |
897 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
898 | teardown_node) { | |
899 | /* Free every object in the session and the session. */ | |
36b588ed | 900 | rcu_read_lock(); |
d0b96690 | 901 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 902 | rcu_read_unlock(); |
d80a6244 | 903 | } |
36b588ed | 904 | |
0b2dc8df | 905 | ht_cleanup_push(app->sessions); |
10b56aef | 906 | ht_cleanup_push(app->ust_sessions_objd); |
0b2dc8df | 907 | ht_cleanup_push(app->ust_objd); |
d80a6244 | 908 | |
6414a713 | 909 | /* |
852d0037 DG |
910 | * Wait until we have deleted the application from the sock hash table |
911 | * before closing this socket, otherwise an application could re-use the | |
912 | * socket ID and race with the teardown, using the same hash table entry. | |
913 | * | |
914 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
915 | * all RCU readers that could run concurrently with unregister app, | |
916 | * therefore we _need_ to only close that socket after a grace period. So | |
917 | * it should stay in this RCU callback. | |
918 | * | |
919 | * This close() is a very important step of the synchronization model so | |
920 | * every modification to this function must be carefully reviewed. | |
6414a713 | 921 | */ |
799e2c4f MD |
922 | ret = close(sock); |
923 | if (ret) { | |
924 | PERROR("close"); | |
925 | } | |
4063050c | 926 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 927 | |
852d0037 | 928 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 929 | free(app); |
82cac6d2 | 930 | session_unlock_list(); |
099e26bd DG |
931 | } |
932 | ||
933 | /* | |
f6a9efaa | 934 | * URCU intermediate call to delete an UST app. |
099e26bd | 935 | */ |
8b366481 DG |
936 | static |
937 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 938 | { |
bec39940 DG |
939 | struct lttng_ht_node_ulong *node = |
940 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 941 | struct ust_app *app = |
852d0037 | 942 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 943 | |
852d0037 | 944 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 945 | delete_ust_app(app); |
099e26bd DG |
946 | } |
947 | ||
ffe60014 DG |
948 | /* |
949 | * Delete the session from the application ht and delete the data structure by | |
950 | * freeing every object inside and releasing them. | |
82cac6d2 JG |
951 | * |
952 | * The session list lock must be held by the caller. | |
ffe60014 | 953 | */ |
d0b96690 | 954 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
955 | struct ust_app_session *ua_sess) |
956 | { | |
957 | int ret; | |
958 | struct lttng_ht_iter iter; | |
959 | ||
960 | assert(app); | |
961 | assert(ua_sess); | |
962 | ||
963 | iter.iter.node = &ua_sess->node.node; | |
964 | ret = lttng_ht_del(app->sessions, &iter); | |
965 | if (ret) { | |
966 | /* Already scheduled for teardown. */ | |
967 | goto end; | |
968 | } | |
969 | ||
970 | /* Once deleted, free the data structure. */ | |
d0b96690 | 971 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
972 | |
973 | end: | |
974 | return; | |
975 | } | |
976 | ||
8b366481 DG |
977 | /* |
978 | * Alloc new UST app session. | |
979 | */ | |
980 | static | |
d0b96690 | 981 | struct ust_app_session *alloc_ust_app_session(struct ust_app *app) |
8b366481 DG |
982 | { |
983 | struct ust_app_session *ua_sess; | |
984 | ||
985 | /* Init most of the default value by allocating and zeroing */ | |
986 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
987 | if (ua_sess == NULL) { | |
988 | PERROR("malloc"); | |
ffe60014 | 989 | goto error_free; |
8b366481 DG |
990 | } |
991 | ||
992 | ua_sess->handle = -1; | |
bec39940 | 993 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
ad7a9107 | 994 | ua_sess->metadata_attr.type = LTTNG_UST_CHAN_METADATA; |
84ad93e8 | 995 | pthread_mutex_init(&ua_sess->lock, NULL); |
ad7a9107 | 996 | |
8b366481 DG |
997 | return ua_sess; |
998 | ||
ffe60014 | 999 | error_free: |
8b366481 DG |
1000 | return NULL; |
1001 | } | |
1002 | ||
1003 | /* | |
1004 | * Alloc new UST app channel. | |
1005 | */ | |
1006 | static | |
1007 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 1008 | struct ust_app_session *ua_sess, |
ffe60014 | 1009 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
1010 | { |
1011 | struct ust_app_channel *ua_chan; | |
1012 | ||
1013 | /* Init most of the default value by allocating and zeroing */ | |
1014 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
1015 | if (ua_chan == NULL) { | |
1016 | PERROR("malloc"); | |
1017 | goto error; | |
1018 | } | |
1019 | ||
1020 | /* Setup channel name */ | |
1021 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
1022 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
1023 | ||
1024 | ua_chan->enabled = 1; | |
1025 | ua_chan->handle = -1; | |
45893984 | 1026 | ua_chan->session = ua_sess; |
ffe60014 | 1027 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
1028 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
1029 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
1030 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
1031 | |
1032 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
31746f93 | 1033 | CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); |
8b366481 DG |
1034 | |
1035 | /* Copy attributes */ | |
1036 | if (attr) { | |
ffe60014 | 1037 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
1038 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
1039 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
1040 | ua_chan->attr.overwrite = attr->overwrite; | |
1041 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
1042 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
1043 | ua_chan->attr.output = attr->output; | |
491d1539 | 1044 | ua_chan->attr.blocking_timeout = attr->u.s.blocking_timeout; |
8b366481 | 1045 | } |
ffe60014 DG |
1046 | /* By default, the channel is a per cpu channel. */ |
1047 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
1048 | |
1049 | DBG3("UST app channel %s allocated", ua_chan->name); | |
1050 | ||
1051 | return ua_chan; | |
1052 | ||
1053 | error: | |
1054 | return NULL; | |
1055 | } | |
1056 | ||
37f1c236 DG |
1057 | /* |
1058 | * Allocate and initialize a UST app stream. | |
1059 | * | |
1060 | * Return newly allocated stream pointer or NULL on error. | |
1061 | */ | |
ffe60014 | 1062 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
1063 | { |
1064 | struct ust_app_stream *stream = NULL; | |
1065 | ||
1066 | stream = zmalloc(sizeof(*stream)); | |
1067 | if (stream == NULL) { | |
1068 | PERROR("zmalloc ust app stream"); | |
1069 | goto error; | |
1070 | } | |
1071 | ||
1072 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
1073 | stream->handle = -1; | |
1074 | ||
1075 | error: | |
1076 | return stream; | |
1077 | } | |
1078 | ||
8b366481 DG |
1079 | /* |
1080 | * Alloc new UST app event. | |
1081 | */ | |
1082 | static | |
1083 | struct ust_app_event *alloc_ust_app_event(char *name, | |
1084 | struct lttng_ust_event *attr) | |
1085 | { | |
1086 | struct ust_app_event *ua_event; | |
1087 | ||
1088 | /* Init most of the default value by allocating and zeroing */ | |
1089 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
1090 | if (ua_event == NULL) { | |
1091 | PERROR("malloc"); | |
1092 | goto error; | |
1093 | } | |
1094 | ||
1095 | ua_event->enabled = 1; | |
1096 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
1097 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 1098 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
1099 | |
1100 | /* Copy attributes */ | |
1101 | if (attr) { | |
1102 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
1103 | } | |
1104 | ||
1105 | DBG3("UST app event %s allocated", ua_event->name); | |
1106 | ||
1107 | return ua_event; | |
1108 | ||
1109 | error: | |
1110 | return NULL; | |
1111 | } | |
1112 | ||
1113 | /* | |
1114 | * Alloc new UST app context. | |
1115 | */ | |
1116 | static | |
bdf64013 | 1117 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context_attr *uctx) |
8b366481 DG |
1118 | { |
1119 | struct ust_app_ctx *ua_ctx; | |
1120 | ||
1121 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
1122 | if (ua_ctx == NULL) { | |
1123 | goto error; | |
1124 | } | |
1125 | ||
31746f93 DG |
1126 | CDS_INIT_LIST_HEAD(&ua_ctx->list); |
1127 | ||
8b366481 DG |
1128 | if (uctx) { |
1129 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
bdf64013 JG |
1130 | if (uctx->ctx == LTTNG_UST_CONTEXT_APP_CONTEXT) { |
1131 | char *provider_name = NULL, *ctx_name = NULL; | |
1132 | ||
1133 | provider_name = strdup(uctx->u.app_ctx.provider_name); | |
1134 | ctx_name = strdup(uctx->u.app_ctx.ctx_name); | |
1135 | if (!provider_name || !ctx_name) { | |
1136 | free(provider_name); | |
1137 | free(ctx_name); | |
1138 | goto error; | |
1139 | } | |
1140 | ||
1141 | ua_ctx->ctx.u.app_ctx.provider_name = provider_name; | |
1142 | ua_ctx->ctx.u.app_ctx.ctx_name = ctx_name; | |
1143 | } | |
8b366481 DG |
1144 | } |
1145 | ||
1146 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
8b366481 | 1147 | return ua_ctx; |
bdf64013 JG |
1148 | error: |
1149 | free(ua_ctx); | |
1150 | return NULL; | |
8b366481 DG |
1151 | } |
1152 | ||
025faf73 DG |
1153 | /* |
1154 | * Allocate a filter and copy the given original filter. | |
1155 | * | |
1156 | * Return allocated filter or NULL on error. | |
1157 | */ | |
51755dc8 JG |
1158 | static struct lttng_filter_bytecode *copy_filter_bytecode( |
1159 | struct lttng_filter_bytecode *orig_f) | |
025faf73 | 1160 | { |
51755dc8 | 1161 | struct lttng_filter_bytecode *filter = NULL; |
025faf73 DG |
1162 | |
1163 | /* Copy filter bytecode */ | |
1164 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
1165 | if (!filter) { | |
51755dc8 | 1166 | PERROR("zmalloc alloc filter bytecode"); |
025faf73 DG |
1167 | goto error; |
1168 | } | |
1169 | ||
1170 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
1171 | ||
1172 | error: | |
1173 | return filter; | |
1174 | } | |
1175 | ||
51755dc8 JG |
1176 | /* |
1177 | * Create a liblttng-ust filter bytecode from given bytecode. | |
1178 | * | |
1179 | * Return allocated filter or NULL on error. | |
1180 | */ | |
1181 | static struct lttng_ust_filter_bytecode *create_ust_bytecode_from_bytecode( | |
1182 | struct lttng_filter_bytecode *orig_f) | |
1183 | { | |
1184 | struct lttng_ust_filter_bytecode *filter = NULL; | |
1185 | ||
1186 | /* Copy filter bytecode */ | |
1187 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
1188 | if (!filter) { | |
1189 | PERROR("zmalloc alloc ust filter bytecode"); | |
1190 | goto error; | |
1191 | } | |
1192 | ||
1193 | assert(sizeof(struct lttng_filter_bytecode) == | |
1194 | sizeof(struct lttng_ust_filter_bytecode)); | |
1195 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
1196 | error: | |
1197 | return filter; | |
1198 | } | |
1199 | ||
099e26bd | 1200 | /* |
421cb601 DG |
1201 | * Find an ust_app using the sock and return it. RCU read side lock must be |
1202 | * held before calling this helper function. | |
099e26bd | 1203 | */ |
f20baf8e | 1204 | struct ust_app *ust_app_find_by_sock(int sock) |
099e26bd | 1205 | { |
bec39940 | 1206 | struct lttng_ht_node_ulong *node; |
bec39940 | 1207 | struct lttng_ht_iter iter; |
f6a9efaa | 1208 | |
852d0037 | 1209 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 1210 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
1211 | if (node == NULL) { |
1212 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
1213 | goto error; |
1214 | } | |
852d0037 DG |
1215 | |
1216 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
1217 | |
1218 | error: | |
1219 | return NULL; | |
099e26bd DG |
1220 | } |
1221 | ||
d0b96690 DG |
1222 | /* |
1223 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
1224 | * be held before calling this helper function. | |
1225 | */ | |
1226 | static struct ust_app *find_app_by_notify_sock(int sock) | |
1227 | { | |
1228 | struct lttng_ht_node_ulong *node; | |
1229 | struct lttng_ht_iter iter; | |
1230 | ||
1231 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
1232 | &iter); | |
1233 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1234 | if (node == NULL) { | |
1235 | DBG2("UST app find by notify sock %d not found", sock); | |
1236 | goto error; | |
1237 | } | |
1238 | ||
1239 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
1240 | ||
1241 | error: | |
1242 | return NULL; | |
1243 | } | |
1244 | ||
025faf73 DG |
1245 | /* |
1246 | * Lookup for an ust app event based on event name, filter bytecode and the | |
1247 | * event loglevel. | |
1248 | * | |
1249 | * Return an ust_app_event object or NULL on error. | |
1250 | */ | |
18eace3b | 1251 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
2106efa0 PP |
1252 | char *name, struct lttng_filter_bytecode *filter, |
1253 | int loglevel_value, | |
39c5a3a7 | 1254 | const struct lttng_event_exclusion *exclusion) |
18eace3b DG |
1255 | { |
1256 | struct lttng_ht_iter iter; | |
1257 | struct lttng_ht_node_str *node; | |
1258 | struct ust_app_event *event = NULL; | |
1259 | struct ust_app_ht_key key; | |
18eace3b DG |
1260 | |
1261 | assert(name); | |
1262 | assert(ht); | |
1263 | ||
1264 | /* Setup key for event lookup. */ | |
1265 | key.name = name; | |
1266 | key.filter = filter; | |
2106efa0 | 1267 | key.loglevel_type = loglevel_value; |
39c5a3a7 | 1268 | /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */ |
51755dc8 | 1269 | key.exclusion = exclusion; |
18eace3b | 1270 | |
025faf73 DG |
1271 | /* Lookup using the event name as hash and a custom match fct. */ |
1272 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1273 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1274 | node = lttng_ht_iter_get_node_str(&iter); |
1275 | if (node == NULL) { | |
1276 | goto end; | |
1277 | } | |
1278 | ||
1279 | event = caa_container_of(node, struct ust_app_event, node); | |
1280 | ||
1281 | end: | |
18eace3b DG |
1282 | return event; |
1283 | } | |
1284 | ||
55cc08a6 DG |
1285 | /* |
1286 | * Create the channel context on the tracer. | |
d0b96690 DG |
1287 | * |
1288 | * Called with UST app session lock held. | |
55cc08a6 DG |
1289 | */ |
1290 | static | |
1291 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1292 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1293 | { | |
1294 | int ret; | |
1295 | ||
840cb59c | 1296 | health_code_update(); |
86acf0da | 1297 | |
fb45065e | 1298 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1299 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 | 1300 | ua_chan->obj, &ua_ctx->obj); |
fb45065e | 1301 | pthread_mutex_unlock(&app->sock_lock); |
55cc08a6 | 1302 | if (ret < 0) { |
ffe60014 DG |
1303 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1304 | ERR("UST app create channel context failed for app (pid: %d) " | |
1305 | "with ret %d", app->pid, ret); | |
1306 | } else { | |
3757b385 DG |
1307 | /* |
1308 | * This is normal behavior, an application can die during the | |
1309 | * creation process. Don't report an error so the execution can | |
1310 | * continue normally. | |
1311 | */ | |
1312 | ret = 0; | |
ffe60014 DG |
1313 | DBG3("UST app disable event failed. Application is dead."); |
1314 | } | |
55cc08a6 DG |
1315 | goto error; |
1316 | } | |
1317 | ||
1318 | ua_ctx->handle = ua_ctx->obj->handle; | |
1319 | ||
d0b96690 DG |
1320 | DBG2("UST app context handle %d created successfully for channel %s", |
1321 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1322 | |
1323 | error: | |
840cb59c | 1324 | health_code_update(); |
55cc08a6 DG |
1325 | return ret; |
1326 | } | |
1327 | ||
53a80697 MD |
1328 | /* |
1329 | * Set the filter on the tracer. | |
1330 | */ | |
1331 | static | |
1332 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
1333 | struct ust_app *app) | |
1334 | { | |
1335 | int ret; | |
51755dc8 | 1336 | struct lttng_ust_filter_bytecode *ust_bytecode = NULL; |
53a80697 | 1337 | |
840cb59c | 1338 | health_code_update(); |
86acf0da | 1339 | |
53a80697 | 1340 | if (!ua_event->filter) { |
86acf0da DG |
1341 | ret = 0; |
1342 | goto error; | |
53a80697 MD |
1343 | } |
1344 | ||
51755dc8 JG |
1345 | ust_bytecode = create_ust_bytecode_from_bytecode(ua_event->filter); |
1346 | if (!ust_bytecode) { | |
1347 | ret = -LTTNG_ERR_NOMEM; | |
1348 | goto error; | |
1349 | } | |
fb45065e | 1350 | pthread_mutex_lock(&app->sock_lock); |
51755dc8 | 1351 | ret = ustctl_set_filter(app->sock, ust_bytecode, |
53a80697 | 1352 | ua_event->obj); |
fb45065e | 1353 | pthread_mutex_unlock(&app->sock_lock); |
53a80697 | 1354 | if (ret < 0) { |
ffe60014 DG |
1355 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1356 | ERR("UST app event %s filter failed for app (pid: %d) " | |
1357 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1358 | } else { | |
3757b385 DG |
1359 | /* |
1360 | * This is normal behavior, an application can die during the | |
1361 | * creation process. Don't report an error so the execution can | |
1362 | * continue normally. | |
1363 | */ | |
1364 | ret = 0; | |
ffe60014 DG |
1365 | DBG3("UST app filter event failed. Application is dead."); |
1366 | } | |
53a80697 MD |
1367 | goto error; |
1368 | } | |
1369 | ||
1370 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
1371 | ||
1372 | error: | |
840cb59c | 1373 | health_code_update(); |
51755dc8 | 1374 | free(ust_bytecode); |
53a80697 MD |
1375 | return ret; |
1376 | } | |
1377 | ||
51755dc8 JG |
1378 | static |
1379 | struct lttng_ust_event_exclusion *create_ust_exclusion_from_exclusion( | |
1380 | struct lttng_event_exclusion *exclusion) | |
1381 | { | |
1382 | struct lttng_ust_event_exclusion *ust_exclusion = NULL; | |
1383 | size_t exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) + | |
1384 | LTTNG_UST_SYM_NAME_LEN * exclusion->count; | |
1385 | ||
1386 | ust_exclusion = zmalloc(exclusion_alloc_size); | |
1387 | if (!ust_exclusion) { | |
1388 | PERROR("malloc"); | |
1389 | goto end; | |
1390 | } | |
1391 | ||
1392 | assert(sizeof(struct lttng_event_exclusion) == | |
1393 | sizeof(struct lttng_ust_event_exclusion)); | |
1394 | memcpy(ust_exclusion, exclusion, exclusion_alloc_size); | |
1395 | end: | |
1396 | return ust_exclusion; | |
1397 | } | |
1398 | ||
7cc9a73c JI |
1399 | /* |
1400 | * Set event exclusions on the tracer. | |
1401 | */ | |
1402 | static | |
1403 | int set_ust_event_exclusion(struct ust_app_event *ua_event, | |
1404 | struct ust_app *app) | |
1405 | { | |
1406 | int ret; | |
51755dc8 | 1407 | struct lttng_ust_event_exclusion *ust_exclusion = NULL; |
7cc9a73c JI |
1408 | |
1409 | health_code_update(); | |
1410 | ||
1411 | if (!ua_event->exclusion || !ua_event->exclusion->count) { | |
1412 | ret = 0; | |
1413 | goto error; | |
1414 | } | |
1415 | ||
51755dc8 JG |
1416 | ust_exclusion = create_ust_exclusion_from_exclusion( |
1417 | ua_event->exclusion); | |
1418 | if (!ust_exclusion) { | |
1419 | ret = -LTTNG_ERR_NOMEM; | |
1420 | goto error; | |
1421 | } | |
fb45065e | 1422 | pthread_mutex_lock(&app->sock_lock); |
51755dc8 | 1423 | ret = ustctl_set_exclusion(app->sock, ust_exclusion, ua_event->obj); |
fb45065e | 1424 | pthread_mutex_unlock(&app->sock_lock); |
7cc9a73c JI |
1425 | if (ret < 0) { |
1426 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1427 | ERR("UST app event %s exclusions failed for app (pid: %d) " | |
1428 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1429 | } else { | |
1430 | /* | |
1431 | * This is normal behavior, an application can die during the | |
1432 | * creation process. Don't report an error so the execution can | |
1433 | * continue normally. | |
1434 | */ | |
1435 | ret = 0; | |
1436 | DBG3("UST app event exclusion failed. Application is dead."); | |
1437 | } | |
1438 | goto error; | |
1439 | } | |
1440 | ||
1441 | DBG2("UST exclusion set successfully for event %s", ua_event->name); | |
1442 | ||
1443 | error: | |
1444 | health_code_update(); | |
51755dc8 | 1445 | free(ust_exclusion); |
7cc9a73c JI |
1446 | return ret; |
1447 | } | |
1448 | ||
9730260e DG |
1449 | /* |
1450 | * Disable the specified event on to UST tracer for the UST session. | |
1451 | */ | |
1452 | static int disable_ust_event(struct ust_app *app, | |
1453 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1454 | { | |
1455 | int ret; | |
1456 | ||
840cb59c | 1457 | health_code_update(); |
86acf0da | 1458 | |
fb45065e | 1459 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1460 | ret = ustctl_disable(app->sock, ua_event->obj); |
fb45065e | 1461 | pthread_mutex_unlock(&app->sock_lock); |
9730260e | 1462 | if (ret < 0) { |
ffe60014 DG |
1463 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1464 | ERR("UST app event %s disable failed for app (pid: %d) " | |
1465 | "and session handle %d with ret %d", | |
1466 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1467 | } else { | |
3757b385 DG |
1468 | /* |
1469 | * This is normal behavior, an application can die during the | |
1470 | * creation process. Don't report an error so the execution can | |
1471 | * continue normally. | |
1472 | */ | |
1473 | ret = 0; | |
ffe60014 DG |
1474 | DBG3("UST app disable event failed. Application is dead."); |
1475 | } | |
9730260e DG |
1476 | goto error; |
1477 | } | |
1478 | ||
1479 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 1480 | ua_event->attr.name, app->pid); |
9730260e DG |
1481 | |
1482 | error: | |
840cb59c | 1483 | health_code_update(); |
9730260e DG |
1484 | return ret; |
1485 | } | |
1486 | ||
78f0bacd DG |
1487 | /* |
1488 | * Disable the specified channel on to UST tracer for the UST session. | |
1489 | */ | |
1490 | static int disable_ust_channel(struct ust_app *app, | |
1491 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1492 | { | |
1493 | int ret; | |
1494 | ||
840cb59c | 1495 | health_code_update(); |
86acf0da | 1496 | |
fb45065e | 1497 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1498 | ret = ustctl_disable(app->sock, ua_chan->obj); |
fb45065e | 1499 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1500 | if (ret < 0) { |
ffe60014 DG |
1501 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1502 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1503 | "and session handle %d with ret %d", | |
1504 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1505 | } else { | |
3757b385 DG |
1506 | /* |
1507 | * This is normal behavior, an application can die during the | |
1508 | * creation process. Don't report an error so the execution can | |
1509 | * continue normally. | |
1510 | */ | |
1511 | ret = 0; | |
ffe60014 DG |
1512 | DBG3("UST app disable channel failed. Application is dead."); |
1513 | } | |
78f0bacd DG |
1514 | goto error; |
1515 | } | |
1516 | ||
78f0bacd | 1517 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1518 | ua_chan->name, app->pid); |
78f0bacd DG |
1519 | |
1520 | error: | |
840cb59c | 1521 | health_code_update(); |
78f0bacd DG |
1522 | return ret; |
1523 | } | |
1524 | ||
1525 | /* | |
1526 | * Enable the specified channel on to UST tracer for the UST session. | |
1527 | */ | |
1528 | static int enable_ust_channel(struct ust_app *app, | |
1529 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1530 | { | |
1531 | int ret; | |
1532 | ||
840cb59c | 1533 | health_code_update(); |
86acf0da | 1534 | |
fb45065e | 1535 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1536 | ret = ustctl_enable(app->sock, ua_chan->obj); |
fb45065e | 1537 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1538 | if (ret < 0) { |
ffe60014 DG |
1539 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1540 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1541 | "and session handle %d with ret %d", | |
1542 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1543 | } else { | |
3757b385 DG |
1544 | /* |
1545 | * This is normal behavior, an application can die during the | |
1546 | * creation process. Don't report an error so the execution can | |
1547 | * continue normally. | |
1548 | */ | |
1549 | ret = 0; | |
ffe60014 DG |
1550 | DBG3("UST app enable channel failed. Application is dead."); |
1551 | } | |
78f0bacd DG |
1552 | goto error; |
1553 | } | |
1554 | ||
1555 | ua_chan->enabled = 1; | |
1556 | ||
1557 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1558 | ua_chan->name, app->pid); |
78f0bacd DG |
1559 | |
1560 | error: | |
840cb59c | 1561 | health_code_update(); |
78f0bacd DG |
1562 | return ret; |
1563 | } | |
1564 | ||
edb67388 DG |
1565 | /* |
1566 | * Enable the specified event on to UST tracer for the UST session. | |
1567 | */ | |
1568 | static int enable_ust_event(struct ust_app *app, | |
1569 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1570 | { | |
1571 | int ret; | |
1572 | ||
840cb59c | 1573 | health_code_update(); |
86acf0da | 1574 | |
fb45065e | 1575 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1576 | ret = ustctl_enable(app->sock, ua_event->obj); |
fb45065e | 1577 | pthread_mutex_unlock(&app->sock_lock); |
edb67388 | 1578 | if (ret < 0) { |
ffe60014 DG |
1579 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1580 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1581 | "and session handle %d with ret %d", | |
1582 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1583 | } else { | |
3757b385 DG |
1584 | /* |
1585 | * This is normal behavior, an application can die during the | |
1586 | * creation process. Don't report an error so the execution can | |
1587 | * continue normally. | |
1588 | */ | |
1589 | ret = 0; | |
ffe60014 DG |
1590 | DBG3("UST app enable event failed. Application is dead."); |
1591 | } | |
edb67388 DG |
1592 | goto error; |
1593 | } | |
1594 | ||
1595 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1596 | ua_event->attr.name, app->pid); |
edb67388 DG |
1597 | |
1598 | error: | |
840cb59c | 1599 | health_code_update(); |
edb67388 DG |
1600 | return ret; |
1601 | } | |
1602 | ||
099e26bd | 1603 | /* |
7972aab2 | 1604 | * Send channel and stream buffer to application. |
4f3ab6ee | 1605 | * |
ffe60014 | 1606 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1607 | */ |
7972aab2 DG |
1608 | static int send_channel_pid_to_ust(struct ust_app *app, |
1609 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1610 | { |
1611 | int ret; | |
ffe60014 | 1612 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1613 | |
1614 | assert(app); | |
ffe60014 | 1615 | assert(ua_sess); |
4f3ab6ee | 1616 | assert(ua_chan); |
4f3ab6ee | 1617 | |
840cb59c | 1618 | health_code_update(); |
4f3ab6ee | 1619 | |
7972aab2 DG |
1620 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1621 | app->sock); | |
86acf0da | 1622 | |
ffe60014 DG |
1623 | /* Send channel to the application. */ |
1624 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
1625 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1626 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1627 | goto error; | |
1628 | } else if (ret < 0) { | |
b551a063 DG |
1629 | goto error; |
1630 | } | |
1631 | ||
d88aee68 DG |
1632 | health_code_update(); |
1633 | ||
ffe60014 DG |
1634 | /* Send all streams to application. */ |
1635 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1636 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
a7169585 MD |
1637 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1638 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1639 | goto error; | |
1640 | } else if (ret < 0) { | |
ffe60014 DG |
1641 | goto error; |
1642 | } | |
1643 | /* We don't need the stream anymore once sent to the tracer. */ | |
1644 | cds_list_del(&stream->list); | |
fb45065e | 1645 | delete_ust_app_stream(-1, stream, app); |
ffe60014 | 1646 | } |
ffe60014 DG |
1647 | /* Flag the channel that it is sent to the application. */ |
1648 | ua_chan->is_sent = 1; | |
ffe60014 | 1649 | |
b551a063 | 1650 | error: |
840cb59c | 1651 | health_code_update(); |
b551a063 DG |
1652 | return ret; |
1653 | } | |
1654 | ||
91d76f53 | 1655 | /* |
5b4a0ec0 | 1656 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1657 | * |
1658 | * Should be called with session mutex held. | |
91d76f53 | 1659 | */ |
edb67388 DG |
1660 | static |
1661 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1662 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1663 | { |
5b4a0ec0 | 1664 | int ret = 0; |
284d8f55 | 1665 | |
840cb59c | 1666 | health_code_update(); |
86acf0da | 1667 | |
5b4a0ec0 | 1668 | /* Create UST event on tracer */ |
fb45065e | 1669 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1670 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 | 1671 | &ua_event->obj); |
fb45065e | 1672 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 | 1673 | if (ret < 0) { |
ffe60014 DG |
1674 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1675 | ERR("Error ustctl create event %s for app pid: %d with ret %d", | |
1676 | ua_event->attr.name, app->pid, ret); | |
1677 | } else { | |
3757b385 DG |
1678 | /* |
1679 | * This is normal behavior, an application can die during the | |
1680 | * creation process. Don't report an error so the execution can | |
1681 | * continue normally. | |
1682 | */ | |
1683 | ret = 0; | |
ffe60014 DG |
1684 | DBG3("UST app create event failed. Application is dead."); |
1685 | } | |
5b4a0ec0 | 1686 | goto error; |
91d76f53 | 1687 | } |
f6a9efaa | 1688 | |
5b4a0ec0 | 1689 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1690 | |
5b4a0ec0 | 1691 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1692 | ua_event->attr.name, app->pid); |
f6a9efaa | 1693 | |
840cb59c | 1694 | health_code_update(); |
86acf0da | 1695 | |
025faf73 DG |
1696 | /* Set filter if one is present. */ |
1697 | if (ua_event->filter) { | |
1698 | ret = set_ust_event_filter(ua_event, app); | |
1699 | if (ret < 0) { | |
1700 | goto error; | |
1701 | } | |
1702 | } | |
1703 | ||
7cc9a73c JI |
1704 | /* Set exclusions for the event */ |
1705 | if (ua_event->exclusion) { | |
1706 | ret = set_ust_event_exclusion(ua_event, app); | |
1707 | if (ret < 0) { | |
1708 | goto error; | |
1709 | } | |
1710 | } | |
1711 | ||
8535a6d9 | 1712 | /* If event not enabled, disable it on the tracer */ |
40113787 MD |
1713 | if (ua_event->enabled) { |
1714 | /* | |
1715 | * We now need to explicitly enable the event, since it | |
1716 | * is now disabled at creation. | |
1717 | */ | |
1718 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1719 | if (ret < 0) { | |
1720 | /* | |
1721 | * If we hit an EPERM, something is wrong with our enable call. If | |
1722 | * we get an EEXIST, there is a problem on the tracer side since we | |
1723 | * just created it. | |
1724 | */ | |
1725 | switch (ret) { | |
1726 | case -LTTNG_UST_ERR_PERM: | |
1727 | /* Code flow problem */ | |
1728 | assert(0); | |
1729 | case -LTTNG_UST_ERR_EXIST: | |
1730 | /* It's OK for our use case. */ | |
1731 | ret = 0; | |
1732 | break; | |
1733 | default: | |
1734 | break; | |
1735 | } | |
1736 | goto error; | |
1737 | } | |
8535a6d9 DG |
1738 | } |
1739 | ||
5b4a0ec0 | 1740 | error: |
840cb59c | 1741 | health_code_update(); |
5b4a0ec0 | 1742 | return ret; |
91d76f53 | 1743 | } |
48842b30 | 1744 | |
5b4a0ec0 DG |
1745 | /* |
1746 | * Copy data between an UST app event and a LTT event. | |
1747 | */ | |
421cb601 | 1748 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1749 | struct ltt_ust_event *uevent) |
1750 | { | |
b4ffad32 JI |
1751 | size_t exclusion_alloc_size; |
1752 | ||
48842b30 DG |
1753 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); |
1754 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1755 | ||
fc34caaa DG |
1756 | ua_event->enabled = uevent->enabled; |
1757 | ||
5b4a0ec0 DG |
1758 | /* Copy event attributes */ |
1759 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1760 | ||
53a80697 MD |
1761 | /* Copy filter bytecode */ |
1762 | if (uevent->filter) { | |
51755dc8 | 1763 | ua_event->filter = copy_filter_bytecode(uevent->filter); |
025faf73 | 1764 | /* Filter might be NULL here in case of ENONEM. */ |
53a80697 | 1765 | } |
b4ffad32 JI |
1766 | |
1767 | /* Copy exclusion data */ | |
1768 | if (uevent->exclusion) { | |
51755dc8 | 1769 | exclusion_alloc_size = sizeof(struct lttng_event_exclusion) + |
b4ffad32 JI |
1770 | LTTNG_UST_SYM_NAME_LEN * uevent->exclusion->count; |
1771 | ua_event->exclusion = zmalloc(exclusion_alloc_size); | |
5f8df26c JI |
1772 | if (ua_event->exclusion == NULL) { |
1773 | PERROR("malloc"); | |
1774 | } else { | |
1775 | memcpy(ua_event->exclusion, uevent->exclusion, | |
1776 | exclusion_alloc_size); | |
b4ffad32 JI |
1777 | } |
1778 | } | |
48842b30 DG |
1779 | } |
1780 | ||
5b4a0ec0 DG |
1781 | /* |
1782 | * Copy data between an UST app channel and a LTT channel. | |
1783 | */ | |
421cb601 | 1784 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1785 | struct ltt_ust_channel *uchan) |
1786 | { | |
bec39940 | 1787 | struct lttng_ht_iter iter; |
48842b30 | 1788 | struct ltt_ust_event *uevent; |
55cc08a6 | 1789 | struct ltt_ust_context *uctx; |
48842b30 DG |
1790 | struct ust_app_event *ua_event; |
1791 | ||
fc34caaa | 1792 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1793 | |
1794 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1795 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 1796 | |
1624d5b7 JD |
1797 | ua_chan->tracefile_size = uchan->tracefile_size; |
1798 | ua_chan->tracefile_count = uchan->tracefile_count; | |
1799 | ||
ffe60014 DG |
1800 | /* Copy event attributes since the layout is different. */ |
1801 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1802 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1803 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1804 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1805 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
e9404c27 | 1806 | ua_chan->monitor_timer_interval = uchan->monitor_timer_interval; |
ffe60014 | 1807 | ua_chan->attr.output = uchan->attr.output; |
491d1539 MD |
1808 | ua_chan->attr.blocking_timeout = uchan->attr.u.s.blocking_timeout; |
1809 | ||
ffe60014 DG |
1810 | /* |
1811 | * Note that the attribute channel type is not set since the channel on the | |
1812 | * tracing registry side does not have this information. | |
1813 | */ | |
48842b30 | 1814 | |
fc34caaa | 1815 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1816 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1817 | |
31746f93 | 1818 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { |
bdf64013 JG |
1819 | struct ust_app_ctx *ua_ctx = alloc_ust_app_ctx(&uctx->ctx); |
1820 | ||
55cc08a6 DG |
1821 | if (ua_ctx == NULL) { |
1822 | continue; | |
1823 | } | |
bec39940 DG |
1824 | lttng_ht_node_init_ulong(&ua_ctx->node, |
1825 | (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 1826 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 1827 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
55cc08a6 | 1828 | } |
48842b30 | 1829 | |
421cb601 | 1830 | /* Copy all events from ltt ust channel to ust app channel */ |
bec39940 | 1831 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
18eace3b | 1832 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 1833 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 1834 | if (ua_event == NULL) { |
421cb601 | 1835 | DBG2("UST event %s not found on shadow copy channel", |
48842b30 | 1836 | uevent->attr.name); |
284d8f55 | 1837 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
48842b30 | 1838 | if (ua_event == NULL) { |
5b4a0ec0 | 1839 | continue; |
48842b30 | 1840 | } |
421cb601 | 1841 | shadow_copy_event(ua_event, uevent); |
d0b96690 | 1842 | add_unique_ust_app_event(ua_chan, ua_event); |
48842b30 | 1843 | } |
48842b30 DG |
1844 | } |
1845 | ||
fc34caaa | 1846 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1847 | } |
1848 | ||
5b4a0ec0 DG |
1849 | /* |
1850 | * Copy data between a UST app session and a regular LTT session. | |
1851 | */ | |
421cb601 | 1852 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1853 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1854 | { |
bec39940 DG |
1855 | struct lttng_ht_node_str *ua_chan_node; |
1856 | struct lttng_ht_iter iter; | |
48842b30 DG |
1857 | struct ltt_ust_channel *uchan; |
1858 | struct ust_app_channel *ua_chan; | |
477d7741 MD |
1859 | time_t rawtime; |
1860 | struct tm *timeinfo; | |
1861 | char datetime[16]; | |
1862 | int ret; | |
d7ba1388 | 1863 | char tmp_shm_path[PATH_MAX]; |
477d7741 MD |
1864 | |
1865 | /* Get date and time for unique app path */ | |
1866 | time(&rawtime); | |
1867 | timeinfo = localtime(&rawtime); | |
1868 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1869 | |
421cb601 | 1870 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1871 | |
7972aab2 DG |
1872 | ua_sess->tracing_id = usess->id; |
1873 | ua_sess->id = get_next_session_id(); | |
1874 | ua_sess->uid = app->uid; | |
1875 | ua_sess->gid = app->gid; | |
1876 | ua_sess->euid = usess->uid; | |
1877 | ua_sess->egid = usess->gid; | |
1878 | ua_sess->buffer_type = usess->buffer_type; | |
1879 | ua_sess->bits_per_long = app->bits_per_long; | |
6addfa37 | 1880 | |
7972aab2 | 1881 | /* There is only one consumer object per session possible. */ |
6addfa37 | 1882 | consumer_output_get(usess->consumer); |
7972aab2 | 1883 | ua_sess->consumer = usess->consumer; |
6addfa37 | 1884 | |
2bba9e53 | 1885 | ua_sess->output_traces = usess->output_traces; |
ecc48a90 | 1886 | ua_sess->live_timer_interval = usess->live_timer_interval; |
84ad93e8 DG |
1887 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, |
1888 | &usess->metadata_attr); | |
7972aab2 DG |
1889 | |
1890 | switch (ua_sess->buffer_type) { | |
1891 | case LTTNG_BUFFER_PER_PID: | |
1892 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 1893 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
1894 | datetime); |
1895 | break; | |
1896 | case LTTNG_BUFFER_PER_UID: | |
1897 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1898 | DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long); | |
1899 | break; | |
1900 | default: | |
1901 | assert(0); | |
1902 | goto error; | |
1903 | } | |
477d7741 MD |
1904 | if (ret < 0) { |
1905 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1906 | assert(0); |
7972aab2 | 1907 | goto error; |
477d7741 MD |
1908 | } |
1909 | ||
3d071855 MD |
1910 | strncpy(ua_sess->root_shm_path, usess->root_shm_path, |
1911 | sizeof(ua_sess->root_shm_path)); | |
1912 | ua_sess->root_shm_path[sizeof(ua_sess->root_shm_path) - 1] = '\0'; | |
d7ba1388 MD |
1913 | strncpy(ua_sess->shm_path, usess->shm_path, |
1914 | sizeof(ua_sess->shm_path)); | |
1915 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
1916 | if (ua_sess->shm_path[0]) { | |
1917 | switch (ua_sess->buffer_type) { | |
1918 | case LTTNG_BUFFER_PER_PID: | |
1919 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
1920 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", | |
1921 | app->name, app->pid, datetime); | |
1922 | break; | |
1923 | case LTTNG_BUFFER_PER_UID: | |
1924 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
1925 | DEFAULT_UST_TRACE_UID_PATH, | |
1926 | app->uid, app->bits_per_long); | |
1927 | break; | |
1928 | default: | |
1929 | assert(0); | |
1930 | goto error; | |
1931 | } | |
1932 | if (ret < 0) { | |
1933 | PERROR("sprintf UST shadow copy session"); | |
1934 | assert(0); | |
1935 | goto error; | |
1936 | } | |
1937 | strncat(ua_sess->shm_path, tmp_shm_path, | |
1938 | sizeof(ua_sess->shm_path) - strlen(ua_sess->shm_path) - 1); | |
1939 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
1940 | } | |
1941 | ||
48842b30 | 1942 | /* Iterate over all channels in global domain. */ |
bec39940 DG |
1943 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, |
1944 | uchan, node.node) { | |
1945 | struct lttng_ht_iter uiter; | |
ba767faf | 1946 | |
bec39940 DG |
1947 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
1948 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
5b4a0ec0 | 1949 | if (ua_chan_node != NULL) { |
fc34caaa | 1950 | /* Session exist. Contiuing. */ |
5b4a0ec0 DG |
1951 | continue; |
1952 | } | |
421cb601 | 1953 | |
5b4a0ec0 DG |
1954 | DBG2("Channel %s not found on shadow session copy, creating it", |
1955 | uchan->name); | |
fb83fe64 JD |
1956 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, |
1957 | &uchan->attr); | |
5b4a0ec0 | 1958 | if (ua_chan == NULL) { |
fc34caaa | 1959 | /* malloc failed FIXME: Might want to do handle ENOMEM .. */ |
5b4a0ec0 | 1960 | continue; |
48842b30 | 1961 | } |
5b4a0ec0 | 1962 | shadow_copy_channel(ua_chan, uchan); |
ffe60014 DG |
1963 | /* |
1964 | * The concept of metadata channel does not exist on the tracing | |
1965 | * registry side of the session daemon so this can only be a per CPU | |
1966 | * channel and not metadata. | |
1967 | */ | |
1968 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
1969 | ||
bec39940 | 1970 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); |
48842b30 | 1971 | } |
6addfa37 | 1972 | return; |
7972aab2 DG |
1973 | |
1974 | error: | |
6addfa37 | 1975 | consumer_output_put(ua_sess->consumer); |
48842b30 DG |
1976 | } |
1977 | ||
78f0bacd DG |
1978 | /* |
1979 | * Lookup sesison wrapper. | |
1980 | */ | |
84cd17c6 MD |
1981 | static |
1982 | void __lookup_session_by_app(struct ltt_ust_session *usess, | |
bec39940 | 1983 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1984 | { |
1985 | /* Get right UST app session from app */ | |
d9bf3ca4 | 1986 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
1987 | } |
1988 | ||
421cb601 DG |
1989 | /* |
1990 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1991 | * id. |
421cb601 | 1992 | */ |
48842b30 DG |
1993 | static struct ust_app_session *lookup_session_by_app( |
1994 | struct ltt_ust_session *usess, struct ust_app *app) | |
1995 | { | |
bec39940 | 1996 | struct lttng_ht_iter iter; |
d9bf3ca4 | 1997 | struct lttng_ht_node_u64 *node; |
48842b30 | 1998 | |
84cd17c6 | 1999 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 2000 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
2001 | if (node == NULL) { |
2002 | goto error; | |
2003 | } | |
2004 | ||
2005 | return caa_container_of(node, struct ust_app_session, node); | |
2006 | ||
2007 | error: | |
2008 | return NULL; | |
2009 | } | |
2010 | ||
7972aab2 DG |
2011 | /* |
2012 | * Setup buffer registry per PID for the given session and application. If none | |
2013 | * is found, a new one is created, added to the global registry and | |
2014 | * initialized. If regp is valid, it's set with the newly created object. | |
2015 | * | |
2016 | * Return 0 on success or else a negative value. | |
2017 | */ | |
2018 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
2019 | struct ust_app *app, struct buffer_reg_pid **regp) | |
2020 | { | |
2021 | int ret = 0; | |
2022 | struct buffer_reg_pid *reg_pid; | |
2023 | ||
2024 | assert(ua_sess); | |
2025 | assert(app); | |
2026 | ||
2027 | rcu_read_lock(); | |
2028 | ||
2029 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
2030 | if (!reg_pid) { | |
2031 | /* | |
2032 | * This is the create channel path meaning that if there is NO | |
2033 | * registry available, we have to create one for this session. | |
2034 | */ | |
d7ba1388 | 2035 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid, |
3d071855 | 2036 | ua_sess->root_shm_path, ua_sess->shm_path); |
7972aab2 DG |
2037 | if (ret < 0) { |
2038 | goto error; | |
2039 | } | |
7972aab2 DG |
2040 | } else { |
2041 | goto end; | |
2042 | } | |
2043 | ||
2044 | /* Initialize registry. */ | |
2045 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
2046 | app->bits_per_long, app->uint8_t_alignment, | |
2047 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
2048 | app->uint64_t_alignment, app->long_alignment, |
2049 | app->byte_order, app->version.major, | |
3d071855 MD |
2050 | app->version.minor, reg_pid->root_shm_path, |
2051 | reg_pid->shm_path, | |
d7ba1388 | 2052 | ua_sess->euid, ua_sess->egid); |
7972aab2 | 2053 | if (ret < 0) { |
286c991a MD |
2054 | /* |
2055 | * reg_pid->registry->reg.ust is NULL upon error, so we need to | |
2056 | * destroy the buffer registry, because it is always expected | |
2057 | * that if the buffer registry can be found, its ust registry is | |
2058 | * non-NULL. | |
2059 | */ | |
2060 | buffer_reg_pid_destroy(reg_pid); | |
7972aab2 DG |
2061 | goto error; |
2062 | } | |
2063 | ||
286c991a MD |
2064 | buffer_reg_pid_add(reg_pid); |
2065 | ||
7972aab2 DG |
2066 | DBG3("UST app buffer registry per PID created successfully"); |
2067 | ||
2068 | end: | |
2069 | if (regp) { | |
2070 | *regp = reg_pid; | |
2071 | } | |
2072 | error: | |
2073 | rcu_read_unlock(); | |
2074 | return ret; | |
2075 | } | |
2076 | ||
2077 | /* | |
2078 | * Setup buffer registry per UID for the given session and application. If none | |
2079 | * is found, a new one is created, added to the global registry and | |
2080 | * initialized. If regp is valid, it's set with the newly created object. | |
2081 | * | |
2082 | * Return 0 on success or else a negative value. | |
2083 | */ | |
2084 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
d7ba1388 | 2085 | struct ust_app_session *ua_sess, |
7972aab2 DG |
2086 | struct ust_app *app, struct buffer_reg_uid **regp) |
2087 | { | |
2088 | int ret = 0; | |
2089 | struct buffer_reg_uid *reg_uid; | |
2090 | ||
2091 | assert(usess); | |
2092 | assert(app); | |
2093 | ||
2094 | rcu_read_lock(); | |
2095 | ||
2096 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2097 | if (!reg_uid) { | |
2098 | /* | |
2099 | * This is the create channel path meaning that if there is NO | |
2100 | * registry available, we have to create one for this session. | |
2101 | */ | |
2102 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
3d071855 MD |
2103 | LTTNG_DOMAIN_UST, ®_uid, |
2104 | ua_sess->root_shm_path, ua_sess->shm_path); | |
7972aab2 DG |
2105 | if (ret < 0) { |
2106 | goto error; | |
2107 | } | |
7972aab2 DG |
2108 | } else { |
2109 | goto end; | |
2110 | } | |
2111 | ||
2112 | /* Initialize registry. */ | |
af6142cf | 2113 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
2114 | app->bits_per_long, app->uint8_t_alignment, |
2115 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
2116 | app->uint64_t_alignment, app->long_alignment, |
2117 | app->byte_order, app->version.major, | |
3d071855 MD |
2118 | app->version.minor, reg_uid->root_shm_path, |
2119 | reg_uid->shm_path, usess->uid, usess->gid); | |
7972aab2 | 2120 | if (ret < 0) { |
286c991a MD |
2121 | /* |
2122 | * reg_uid->registry->reg.ust is NULL upon error, so we need to | |
2123 | * destroy the buffer registry, because it is always expected | |
2124 | * that if the buffer registry can be found, its ust registry is | |
2125 | * non-NULL. | |
2126 | */ | |
2127 | buffer_reg_uid_destroy(reg_uid, NULL); | |
7972aab2 DG |
2128 | goto error; |
2129 | } | |
2130 | /* Add node to teardown list of the session. */ | |
2131 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
2132 | ||
286c991a | 2133 | buffer_reg_uid_add(reg_uid); |
7972aab2 | 2134 | |
286c991a | 2135 | DBG3("UST app buffer registry per UID created successfully"); |
7972aab2 DG |
2136 | end: |
2137 | if (regp) { | |
2138 | *regp = reg_uid; | |
2139 | } | |
2140 | error: | |
2141 | rcu_read_unlock(); | |
2142 | return ret; | |
2143 | } | |
2144 | ||
421cb601 | 2145 | /* |
3d8ca23b | 2146 | * Create a session on the tracer side for the given app. |
421cb601 | 2147 | * |
3d8ca23b DG |
2148 | * On success, ua_sess_ptr is populated with the session pointer or else left |
2149 | * untouched. If the session was created, is_created is set to 1. On error, | |
2150 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
2151 | * be NULL. | |
2152 | * | |
2153 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
2154 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 2155 | */ |
3d8ca23b DG |
2156 | static int create_ust_app_session(struct ltt_ust_session *usess, |
2157 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, | |
2158 | int *is_created) | |
421cb601 | 2159 | { |
3d8ca23b | 2160 | int ret, created = 0; |
421cb601 DG |
2161 | struct ust_app_session *ua_sess; |
2162 | ||
3d8ca23b DG |
2163 | assert(usess); |
2164 | assert(app); | |
2165 | assert(ua_sess_ptr); | |
2166 | ||
840cb59c | 2167 | health_code_update(); |
86acf0da | 2168 | |
421cb601 DG |
2169 | ua_sess = lookup_session_by_app(usess, app); |
2170 | if (ua_sess == NULL) { | |
d9bf3ca4 | 2171 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 2172 | app->pid, usess->id); |
d0b96690 | 2173 | ua_sess = alloc_ust_app_session(app); |
421cb601 DG |
2174 | if (ua_sess == NULL) { |
2175 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
2176 | ret = -ENOMEM; |
2177 | goto error; | |
421cb601 | 2178 | } |
477d7741 | 2179 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 2180 | created = 1; |
421cb601 DG |
2181 | } |
2182 | ||
7972aab2 DG |
2183 | switch (usess->buffer_type) { |
2184 | case LTTNG_BUFFER_PER_PID: | |
2185 | /* Init local registry. */ | |
2186 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 2187 | if (ret < 0) { |
e64207cf | 2188 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2189 | goto error; |
2190 | } | |
2191 | break; | |
2192 | case LTTNG_BUFFER_PER_UID: | |
2193 | /* Look for a global registry. If none exists, create one. */ | |
d7ba1388 | 2194 | ret = setup_buffer_reg_uid(usess, ua_sess, app, NULL); |
7972aab2 | 2195 | if (ret < 0) { |
e64207cf | 2196 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2197 | goto error; |
2198 | } | |
2199 | break; | |
2200 | default: | |
2201 | assert(0); | |
2202 | ret = -EINVAL; | |
2203 | goto error; | |
2204 | } | |
2205 | ||
2206 | health_code_update(); | |
2207 | ||
2208 | if (ua_sess->handle == -1) { | |
fb45065e | 2209 | pthread_mutex_lock(&app->sock_lock); |
7972aab2 | 2210 | ret = ustctl_create_session(app->sock); |
fb45065e | 2211 | pthread_mutex_unlock(&app->sock_lock); |
7972aab2 DG |
2212 | if (ret < 0) { |
2213 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
2214 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
2215 | app->pid, ret); |
2216 | } else { | |
2217 | DBG("UST app creating session failed. Application is dead"); | |
3757b385 DG |
2218 | /* |
2219 | * This is normal behavior, an application can die during the | |
2220 | * creation process. Don't report an error so the execution can | |
2221 | * continue normally. This will get flagged ENOTCONN and the | |
2222 | * caller will handle it. | |
2223 | */ | |
2224 | ret = 0; | |
ffe60014 | 2225 | } |
d0b96690 | 2226 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
2227 | if (ret != -ENOMEM) { |
2228 | /* | |
2229 | * Tracer is probably gone or got an internal error so let's | |
2230 | * behave like it will soon unregister or not usable. | |
2231 | */ | |
2232 | ret = -ENOTCONN; | |
2233 | } | |
2234 | goto error; | |
421cb601 DG |
2235 | } |
2236 | ||
7972aab2 DG |
2237 | ua_sess->handle = ret; |
2238 | ||
2239 | /* Add ust app session to app's HT */ | |
d9bf3ca4 MD |
2240 | lttng_ht_node_init_u64(&ua_sess->node, |
2241 | ua_sess->tracing_id); | |
2242 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
10b56aef MD |
2243 | lttng_ht_node_init_ulong(&ua_sess->ust_objd_node, ua_sess->handle); |
2244 | lttng_ht_add_unique_ulong(app->ust_sessions_objd, | |
2245 | &ua_sess->ust_objd_node); | |
7972aab2 DG |
2246 | |
2247 | DBG2("UST app session created successfully with handle %d", ret); | |
2248 | } | |
2249 | ||
2250 | *ua_sess_ptr = ua_sess; | |
2251 | if (is_created) { | |
2252 | *is_created = created; | |
2253 | } | |
2254 | ||
2255 | /* Everything went well. */ | |
2256 | ret = 0; | |
2257 | ||
2258 | error: | |
2259 | health_code_update(); | |
2260 | return ret; | |
2261 | } | |
2262 | ||
6a6b2068 JG |
2263 | /* |
2264 | * Match function for a hash table lookup of ust_app_ctx. | |
2265 | * | |
2266 | * It matches an ust app context based on the context type and, in the case | |
2267 | * of perf counters, their name. | |
2268 | */ | |
2269 | static int ht_match_ust_app_ctx(struct cds_lfht_node *node, const void *_key) | |
2270 | { | |
2271 | struct ust_app_ctx *ctx; | |
bdf64013 | 2272 | const struct lttng_ust_context_attr *key; |
6a6b2068 JG |
2273 | |
2274 | assert(node); | |
2275 | assert(_key); | |
2276 | ||
2277 | ctx = caa_container_of(node, struct ust_app_ctx, node.node); | |
2278 | key = _key; | |
2279 | ||
2280 | /* Context type */ | |
2281 | if (ctx->ctx.ctx != key->ctx) { | |
2282 | goto no_match; | |
2283 | } | |
2284 | ||
bdf64013 JG |
2285 | switch(key->ctx) { |
2286 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: | |
6a6b2068 | 2287 | if (strncmp(key->u.perf_counter.name, |
bdf64013 JG |
2288 | ctx->ctx.u.perf_counter.name, |
2289 | sizeof(key->u.perf_counter.name))) { | |
2290 | goto no_match; | |
2291 | } | |
2292 | break; | |
2293 | case LTTNG_UST_CONTEXT_APP_CONTEXT: | |
2294 | if (strcmp(key->u.app_ctx.provider_name, | |
2295 | ctx->ctx.u.app_ctx.provider_name) || | |
2296 | strcmp(key->u.app_ctx.ctx_name, | |
2297 | ctx->ctx.u.app_ctx.ctx_name)) { | |
6a6b2068 JG |
2298 | goto no_match; |
2299 | } | |
bdf64013 JG |
2300 | break; |
2301 | default: | |
2302 | break; | |
6a6b2068 JG |
2303 | } |
2304 | ||
2305 | /* Match. */ | |
2306 | return 1; | |
2307 | ||
2308 | no_match: | |
2309 | return 0; | |
2310 | } | |
2311 | ||
2312 | /* | |
2313 | * Lookup for an ust app context from an lttng_ust_context. | |
2314 | * | |
be184a0f | 2315 | * Must be called while holding RCU read side lock. |
6a6b2068 JG |
2316 | * Return an ust_app_ctx object or NULL on error. |
2317 | */ | |
2318 | static | |
2319 | struct ust_app_ctx *find_ust_app_context(struct lttng_ht *ht, | |
bdf64013 | 2320 | struct lttng_ust_context_attr *uctx) |
6a6b2068 JG |
2321 | { |
2322 | struct lttng_ht_iter iter; | |
2323 | struct lttng_ht_node_ulong *node; | |
2324 | struct ust_app_ctx *app_ctx = NULL; | |
2325 | ||
2326 | assert(uctx); | |
2327 | assert(ht); | |
2328 | ||
2329 | /* Lookup using the lttng_ust_context_type and a custom match fct. */ | |
2330 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) uctx->ctx, lttng_ht_seed), | |
2331 | ht_match_ust_app_ctx, uctx, &iter.iter); | |
2332 | node = lttng_ht_iter_get_node_ulong(&iter); | |
2333 | if (!node) { | |
2334 | goto end; | |
2335 | } | |
2336 | ||
2337 | app_ctx = caa_container_of(node, struct ust_app_ctx, node); | |
2338 | ||
2339 | end: | |
2340 | return app_ctx; | |
2341 | } | |
2342 | ||
7972aab2 DG |
2343 | /* |
2344 | * Create a context for the channel on the tracer. | |
2345 | * | |
2346 | * Called with UST app session lock held and a RCU read side lock. | |
2347 | */ | |
2348 | static | |
2349 | int create_ust_app_channel_context(struct ust_app_session *ua_sess, | |
bdf64013 JG |
2350 | struct ust_app_channel *ua_chan, |
2351 | struct lttng_ust_context_attr *uctx, | |
7972aab2 DG |
2352 | struct ust_app *app) |
2353 | { | |
2354 | int ret = 0; | |
7972aab2 DG |
2355 | struct ust_app_ctx *ua_ctx; |
2356 | ||
2357 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
2358 | ||
6a6b2068 JG |
2359 | ua_ctx = find_ust_app_context(ua_chan->ctx, uctx); |
2360 | if (ua_ctx) { | |
7972aab2 DG |
2361 | ret = -EEXIST; |
2362 | goto error; | |
2363 | } | |
2364 | ||
2365 | ua_ctx = alloc_ust_app_ctx(uctx); | |
2366 | if (ua_ctx == NULL) { | |
2367 | /* malloc failed */ | |
7682f304 | 2368 | ret = -ENOMEM; |
7972aab2 DG |
2369 | goto error; |
2370 | } | |
2371 | ||
2372 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 2373 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 2374 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
2375 | |
2376 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
2377 | if (ret < 0) { | |
2378 | goto error; | |
2379 | } | |
2380 | ||
2381 | error: | |
2382 | return ret; | |
2383 | } | |
2384 | ||
2385 | /* | |
2386 | * Enable on the tracer side a ust app event for the session and channel. | |
2387 | * | |
2388 | * Called with UST app session lock held. | |
2389 | */ | |
2390 | static | |
2391 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
2392 | struct ust_app_event *ua_event, struct ust_app *app) | |
2393 | { | |
2394 | int ret; | |
2395 | ||
2396 | ret = enable_ust_event(app, ua_sess, ua_event); | |
2397 | if (ret < 0) { | |
2398 | goto error; | |
2399 | } | |
2400 | ||
2401 | ua_event->enabled = 1; | |
2402 | ||
2403 | error: | |
2404 | return ret; | |
2405 | } | |
2406 | ||
2407 | /* | |
2408 | * Disable on the tracer side a ust app event for the session and channel. | |
2409 | */ | |
2410 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
2411 | struct ust_app_event *ua_event, struct ust_app *app) | |
2412 | { | |
2413 | int ret; | |
2414 | ||
2415 | ret = disable_ust_event(app, ua_sess, ua_event); | |
2416 | if (ret < 0) { | |
2417 | goto error; | |
2418 | } | |
2419 | ||
2420 | ua_event->enabled = 0; | |
2421 | ||
2422 | error: | |
2423 | return ret; | |
2424 | } | |
2425 | ||
2426 | /* | |
2427 | * Lookup ust app channel for session and disable it on the tracer side. | |
2428 | */ | |
2429 | static | |
2430 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
2431 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
2432 | { | |
2433 | int ret; | |
2434 | ||
2435 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2436 | if (ret < 0) { | |
2437 | goto error; | |
2438 | } | |
2439 | ||
2440 | ua_chan->enabled = 0; | |
2441 | ||
2442 | error: | |
2443 | return ret; | |
2444 | } | |
2445 | ||
2446 | /* | |
2447 | * Lookup ust app channel for session and enable it on the tracer side. This | |
2448 | * MUST be called with a RCU read side lock acquired. | |
2449 | */ | |
2450 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
2451 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
2452 | { | |
2453 | int ret = 0; | |
2454 | struct lttng_ht_iter iter; | |
2455 | struct lttng_ht_node_str *ua_chan_node; | |
2456 | struct ust_app_channel *ua_chan; | |
2457 | ||
2458 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
2459 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
2460 | if (ua_chan_node == NULL) { | |
d9bf3ca4 | 2461 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
2462 | uchan->name, ua_sess->tracing_id); |
2463 | goto error; | |
2464 | } | |
2465 | ||
2466 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2467 | ||
2468 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
2469 | if (ret < 0) { | |
2470 | goto error; | |
2471 | } | |
2472 | ||
2473 | error: | |
2474 | return ret; | |
2475 | } | |
2476 | ||
2477 | /* | |
2478 | * Ask the consumer to create a channel and get it if successful. | |
2479 | * | |
fad1ed2f JR |
2480 | * Called with UST app session lock held. |
2481 | * | |
7972aab2 DG |
2482 | * Return 0 on success or else a negative value. |
2483 | */ | |
2484 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
2485 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
2486 | int bitness, struct ust_registry_session *registry) | |
2487 | { | |
2488 | int ret; | |
2489 | unsigned int nb_fd = 0; | |
2490 | struct consumer_socket *socket; | |
2491 | ||
2492 | assert(usess); | |
2493 | assert(ua_sess); | |
2494 | assert(ua_chan); | |
2495 | assert(registry); | |
2496 | ||
2497 | rcu_read_lock(); | |
2498 | health_code_update(); | |
2499 | ||
2500 | /* Get the right consumer socket for the application. */ | |
2501 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
2502 | if (!socket) { | |
2503 | ret = -EINVAL; | |
2504 | goto error; | |
2505 | } | |
2506 | ||
2507 | health_code_update(); | |
2508 | ||
2509 | /* Need one fd for the channel. */ | |
2510 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2511 | if (ret < 0) { | |
2512 | ERR("Exhausted number of available FD upon create channel"); | |
2513 | goto error; | |
2514 | } | |
2515 | ||
2516 | /* | |
2517 | * Ask consumer to create channel. The consumer will return the number of | |
2518 | * stream we have to expect. | |
2519 | */ | |
2520 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
2521 | registry); | |
2522 | if (ret < 0) { | |
2523 | goto error_ask; | |
2524 | } | |
2525 | ||
2526 | /* | |
2527 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2528 | * stream (2 being the default value here). | |
2529 | */ | |
2530 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2531 | ||
2532 | /* Reserve the amount of file descriptor we need. */ | |
2533 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2534 | if (ret < 0) { | |
2535 | ERR("Exhausted number of available FD upon create channel"); | |
2536 | goto error_fd_get_stream; | |
2537 | } | |
2538 | ||
2539 | health_code_update(); | |
2540 | ||
2541 | /* | |
2542 | * Now get the channel from the consumer. This call wil populate the stream | |
2543 | * list of that channel and set the ust objects. | |
2544 | */ | |
d9078d0c DG |
2545 | if (usess->consumer->enabled) { |
2546 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2547 | if (ret < 0) { | |
2548 | goto error_destroy; | |
2549 | } | |
7972aab2 DG |
2550 | } |
2551 | ||
2552 | rcu_read_unlock(); | |
2553 | return 0; | |
2554 | ||
2555 | error_destroy: | |
2556 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2557 | error_fd_get_stream: | |
2558 | /* | |
2559 | * Initiate a destroy channel on the consumer since we had an error | |
2560 | * handling it on our side. The return value is of no importance since we | |
2561 | * already have a ret value set by the previous error that we need to | |
2562 | * return. | |
2563 | */ | |
2564 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2565 | error_ask: | |
2566 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2567 | error: | |
2568 | health_code_update(); | |
2569 | rcu_read_unlock(); | |
2570 | return ret; | |
2571 | } | |
2572 | ||
2573 | /* | |
2574 | * Duplicate the ust data object of the ust app stream and save it in the | |
2575 | * buffer registry stream. | |
2576 | * | |
2577 | * Return 0 on success or else a negative value. | |
2578 | */ | |
2579 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2580 | struct ust_app_stream *stream) | |
2581 | { | |
2582 | int ret; | |
2583 | ||
2584 | assert(reg_stream); | |
2585 | assert(stream); | |
2586 | ||
2587 | /* Reserve the amount of file descriptor we need. */ | |
2588 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2589 | if (ret < 0) { | |
2590 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2591 | goto error; | |
2592 | } | |
2593 | ||
2594 | /* Duplicate object for stream once the original is in the registry. */ | |
2595 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2596 | reg_stream->obj.ust); | |
2597 | if (ret < 0) { | |
2598 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2599 | reg_stream->obj.ust, stream->obj, ret); | |
2600 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2601 | goto error; | |
2602 | } | |
2603 | stream->handle = stream->obj->handle; | |
2604 | ||
2605 | error: | |
2606 | return ret; | |
2607 | } | |
2608 | ||
2609 | /* | |
2610 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2611 | * buffer registry channel. | |
2612 | * | |
2613 | * Return 0 on success or else a negative value. | |
2614 | */ | |
2615 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2616 | struct ust_app_channel *ua_chan) | |
2617 | { | |
2618 | int ret; | |
2619 | ||
2620 | assert(reg_chan); | |
2621 | assert(ua_chan); | |
2622 | ||
2623 | /* Need two fds for the channel. */ | |
2624 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2625 | if (ret < 0) { | |
2626 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2627 | goto error_fd_get; | |
2628 | } | |
2629 | ||
2630 | /* Duplicate object for stream once the original is in the registry. */ | |
2631 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2632 | if (ret < 0) { | |
2633 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2634 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2635 | goto error; | |
2636 | } | |
2637 | ua_chan->handle = ua_chan->obj->handle; | |
2638 | ||
2639 | return 0; | |
2640 | ||
2641 | error: | |
2642 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2643 | error_fd_get: | |
2644 | return ret; | |
2645 | } | |
2646 | ||
2647 | /* | |
2648 | * For a given channel buffer registry, setup all streams of the given ust | |
2649 | * application channel. | |
2650 | * | |
2651 | * Return 0 on success or else a negative value. | |
2652 | */ | |
2653 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
fb45065e MD |
2654 | struct ust_app_channel *ua_chan, |
2655 | struct ust_app *app) | |
7972aab2 DG |
2656 | { |
2657 | int ret = 0; | |
2658 | struct ust_app_stream *stream, *stmp; | |
2659 | ||
2660 | assert(reg_chan); | |
2661 | assert(ua_chan); | |
2662 | ||
2663 | DBG2("UST app setup buffer registry stream"); | |
2664 | ||
2665 | /* Send all streams to application. */ | |
2666 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2667 | struct buffer_reg_stream *reg_stream; | |
2668 | ||
2669 | ret = buffer_reg_stream_create(®_stream); | |
2670 | if (ret < 0) { | |
2671 | goto error; | |
2672 | } | |
2673 | ||
2674 | /* | |
2675 | * Keep original pointer and nullify it in the stream so the delete | |
2676 | * stream call does not release the object. | |
2677 | */ | |
2678 | reg_stream->obj.ust = stream->obj; | |
2679 | stream->obj = NULL; | |
2680 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2681 | |
7972aab2 DG |
2682 | /* We don't need the streams anymore. */ |
2683 | cds_list_del(&stream->list); | |
fb45065e | 2684 | delete_ust_app_stream(-1, stream, app); |
7972aab2 | 2685 | } |
421cb601 | 2686 | |
7972aab2 DG |
2687 | error: |
2688 | return ret; | |
2689 | } | |
2690 | ||
2691 | /* | |
2692 | * Create a buffer registry channel for the given session registry and | |
2693 | * application channel object. If regp pointer is valid, it's set with the | |
2694 | * created object. Important, the created object is NOT added to the session | |
2695 | * registry hash table. | |
2696 | * | |
2697 | * Return 0 on success else a negative value. | |
2698 | */ | |
2699 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2700 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2701 | { | |
2702 | int ret; | |
2703 | struct buffer_reg_channel *reg_chan = NULL; | |
2704 | ||
2705 | assert(reg_sess); | |
2706 | assert(ua_chan); | |
2707 | ||
2708 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2709 | ||
2710 | /* Create buffer registry channel. */ | |
2711 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2712 | if (ret < 0) { | |
2713 | goto error_create; | |
421cb601 | 2714 | } |
7972aab2 DG |
2715 | assert(reg_chan); |
2716 | reg_chan->consumer_key = ua_chan->key; | |
8c924c7b | 2717 | reg_chan->subbuf_size = ua_chan->attr.subbuf_size; |
d07ceecd | 2718 | reg_chan->num_subbuf = ua_chan->attr.num_subbuf; |
421cb601 | 2719 | |
7972aab2 DG |
2720 | /* Create and add a channel registry to session. */ |
2721 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2722 | ua_chan->tracing_channel_id); | |
2723 | if (ret < 0) { | |
2724 | goto error; | |
d88aee68 | 2725 | } |
7972aab2 | 2726 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2727 | |
7972aab2 DG |
2728 | if (regp) { |
2729 | *regp = reg_chan; | |
3d8ca23b | 2730 | } |
d88aee68 | 2731 | |
7972aab2 | 2732 | return 0; |
3d8ca23b DG |
2733 | |
2734 | error: | |
7972aab2 DG |
2735 | /* Safe because the registry channel object was not added to any HT. */ |
2736 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2737 | error_create: | |
3d8ca23b | 2738 | return ret; |
421cb601 DG |
2739 | } |
2740 | ||
55cc08a6 | 2741 | /* |
7972aab2 DG |
2742 | * Setup buffer registry channel for the given session registry and application |
2743 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2744 | * |
7972aab2 | 2745 | * Return 0 on success else a negative value. |
55cc08a6 | 2746 | */ |
7972aab2 | 2747 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
fb45065e MD |
2748 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan, |
2749 | struct ust_app *app) | |
55cc08a6 | 2750 | { |
7972aab2 | 2751 | int ret; |
55cc08a6 | 2752 | |
7972aab2 DG |
2753 | assert(reg_sess); |
2754 | assert(reg_chan); | |
2755 | assert(ua_chan); | |
2756 | assert(ua_chan->obj); | |
55cc08a6 | 2757 | |
7972aab2 | 2758 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2759 | |
7972aab2 | 2760 | /* Setup all streams for the registry. */ |
fb45065e | 2761 | ret = setup_buffer_reg_streams(reg_chan, ua_chan, app); |
7972aab2 | 2762 | if (ret < 0) { |
55cc08a6 DG |
2763 | goto error; |
2764 | } | |
2765 | ||
7972aab2 DG |
2766 | reg_chan->obj.ust = ua_chan->obj; |
2767 | ua_chan->obj = NULL; | |
55cc08a6 | 2768 | |
7972aab2 | 2769 | return 0; |
55cc08a6 DG |
2770 | |
2771 | error: | |
7972aab2 DG |
2772 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2773 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2774 | return ret; |
2775 | } | |
2776 | ||
edb67388 | 2777 | /* |
7972aab2 | 2778 | * Send buffer registry channel to the application. |
d0b96690 | 2779 | * |
7972aab2 | 2780 | * Return 0 on success else a negative value. |
edb67388 | 2781 | */ |
7972aab2 DG |
2782 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2783 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2784 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2785 | { |
2786 | int ret; | |
7972aab2 | 2787 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2788 | |
7972aab2 DG |
2789 | assert(reg_chan); |
2790 | assert(app); | |
2791 | assert(ua_sess); | |
2792 | assert(ua_chan); | |
2793 | ||
2794 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2795 | ||
2796 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2797 | if (ret < 0) { |
2798 | goto error; | |
2799 | } | |
2800 | ||
7972aab2 DG |
2801 | /* Send channel to the application. */ |
2802 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
2803 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
2804 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
2805 | goto error; | |
2806 | } else if (ret < 0) { | |
7972aab2 DG |
2807 | goto error; |
2808 | } | |
2809 | ||
2810 | health_code_update(); | |
2811 | ||
2812 | /* Send all streams to application. */ | |
2813 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2814 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2815 | struct ust_app_stream stream; | |
2816 | ||
2817 | ret = duplicate_stream_object(reg_stream, &stream); | |
2818 | if (ret < 0) { | |
2819 | goto error_stream_unlock; | |
2820 | } | |
2821 | ||
2822 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2823 | if (ret < 0) { | |
fb45065e | 2824 | (void) release_ust_app_stream(-1, &stream, app); |
a7169585 MD |
2825 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
2826 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
a7169585 | 2827 | } |
7972aab2 DG |
2828 | goto error_stream_unlock; |
2829 | } | |
edb67388 | 2830 | |
7972aab2 DG |
2831 | /* |
2832 | * The return value is not important here. This function will output an | |
2833 | * error if needed. | |
2834 | */ | |
fb45065e | 2835 | (void) release_ust_app_stream(-1, &stream, app); |
7972aab2 DG |
2836 | } |
2837 | ua_chan->is_sent = 1; | |
2838 | ||
2839 | error_stream_unlock: | |
2840 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2841 | error: |
2842 | return ret; | |
2843 | } | |
2844 | ||
9730260e | 2845 | /* |
7972aab2 DG |
2846 | * Create and send to the application the created buffers with per UID buffers. |
2847 | * | |
2848 | * Return 0 on success else a negative value. | |
9730260e | 2849 | */ |
7972aab2 DG |
2850 | static int create_channel_per_uid(struct ust_app *app, |
2851 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2852 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2853 | { |
2854 | int ret; | |
7972aab2 DG |
2855 | struct buffer_reg_uid *reg_uid; |
2856 | struct buffer_reg_channel *reg_chan; | |
e9404c27 | 2857 | bool created = false; |
9730260e | 2858 | |
7972aab2 DG |
2859 | assert(app); |
2860 | assert(usess); | |
2861 | assert(ua_sess); | |
2862 | assert(ua_chan); | |
2863 | ||
2864 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2865 | ||
2866 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2867 | /* | |
2868 | * The session creation handles the creation of this global registry | |
2869 | * object. If none can be find, there is a code flow problem or a | |
2870 | * teardown race. | |
2871 | */ | |
2872 | assert(reg_uid); | |
2873 | ||
2874 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2875 | reg_uid); | |
2876 | if (!reg_chan) { | |
2877 | /* Create the buffer registry channel object. */ | |
2878 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2879 | if (ret < 0) { | |
f14256d6 MD |
2880 | ERR("Error creating the UST channel \"%s\" registry instance", |
2881 | ua_chan->name); | |
7972aab2 DG |
2882 | goto error; |
2883 | } | |
2884 | assert(reg_chan); | |
2885 | ||
2886 | /* | |
2887 | * Create the buffers on the consumer side. This call populates the | |
2888 | * ust app channel object with all streams and data object. | |
2889 | */ | |
2890 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2891 | app->bits_per_long, reg_uid->registry->reg.ust); | |
2892 | if (ret < 0) { | |
f14256d6 MD |
2893 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
2894 | ua_chan->name); | |
2895 | ||
07d2ae95 DG |
2896 | /* |
2897 | * Let's remove the previously created buffer registry channel so | |
2898 | * it's not visible anymore in the session registry. | |
2899 | */ | |
2900 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, | |
e9404c27 | 2901 | ua_chan->tracing_channel_id, false); |
07d2ae95 DG |
2902 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); |
2903 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
7972aab2 DG |
2904 | goto error; |
2905 | } | |
2906 | ||
2907 | /* | |
2908 | * Setup the streams and add it to the session registry. | |
2909 | */ | |
fb45065e MD |
2910 | ret = setup_buffer_reg_channel(reg_uid->registry, |
2911 | ua_chan, reg_chan, app); | |
7972aab2 | 2912 | if (ret < 0) { |
f14256d6 MD |
2913 | ERR("Error setting up UST channel \"%s\"", |
2914 | ua_chan->name); | |
7972aab2 DG |
2915 | goto error; |
2916 | } | |
e9404c27 | 2917 | created = true; |
7972aab2 DG |
2918 | } |
2919 | ||
2920 | /* Send buffers to the application. */ | |
2921 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
9730260e | 2922 | if (ret < 0) { |
a7169585 MD |
2923 | if (ret != -ENOTCONN) { |
2924 | ERR("Error sending channel to application"); | |
2925 | } | |
9730260e DG |
2926 | goto error; |
2927 | } | |
2928 | ||
e9404c27 JG |
2929 | if (created) { |
2930 | enum lttng_error_code cmd_ret; | |
2931 | struct ltt_session *session; | |
2932 | uint64_t chan_reg_key; | |
2933 | struct ust_registry_channel *chan_reg; | |
2934 | ||
2935 | rcu_read_lock(); | |
2936 | chan_reg_key = ua_chan->tracing_channel_id; | |
2937 | ||
2938 | pthread_mutex_lock(®_uid->registry->reg.ust->lock); | |
2939 | chan_reg = ust_registry_channel_find(reg_uid->registry->reg.ust, | |
2940 | chan_reg_key); | |
2941 | assert(chan_reg); | |
2942 | chan_reg->consumer_key = ua_chan->key; | |
2943 | chan_reg = NULL; | |
2944 | pthread_mutex_unlock(®_uid->registry->reg.ust->lock); | |
2945 | ||
2946 | session = session_find_by_id(ua_sess->tracing_id); | |
2947 | assert(session); | |
2948 | ||
2949 | cmd_ret = notification_thread_command_add_channel( | |
2950 | notification_thread_handle, session->name, | |
2951 | ua_sess->euid, ua_sess->egid, | |
2952 | ua_chan->name, | |
2953 | ua_chan->key, | |
2954 | LTTNG_DOMAIN_UST, | |
2955 | ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf); | |
2956 | rcu_read_unlock(); | |
2957 | if (cmd_ret != LTTNG_OK) { | |
2958 | ret = - (int) cmd_ret; | |
2959 | ERR("Failed to add channel to notification thread"); | |
2960 | goto error; | |
2961 | } | |
2962 | } | |
2963 | ||
9730260e DG |
2964 | error: |
2965 | return ret; | |
2966 | } | |
2967 | ||
78f0bacd | 2968 | /* |
7972aab2 DG |
2969 | * Create and send to the application the created buffers with per PID buffers. |
2970 | * | |
fad1ed2f JR |
2971 | * Called with UST app session lock held. |
2972 | * | |
7972aab2 | 2973 | * Return 0 on success else a negative value. |
78f0bacd | 2974 | */ |
7972aab2 DG |
2975 | static int create_channel_per_pid(struct ust_app *app, |
2976 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2977 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2978 | { |
8535a6d9 | 2979 | int ret; |
7972aab2 | 2980 | struct ust_registry_session *registry; |
e9404c27 JG |
2981 | enum lttng_error_code cmd_ret; |
2982 | struct ltt_session *session; | |
2983 | uint64_t chan_reg_key; | |
2984 | struct ust_registry_channel *chan_reg; | |
78f0bacd | 2985 | |
7972aab2 DG |
2986 | assert(app); |
2987 | assert(usess); | |
2988 | assert(ua_sess); | |
2989 | assert(ua_chan); | |
2990 | ||
2991 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2992 | ||
2993 | rcu_read_lock(); | |
2994 | ||
2995 | registry = get_session_registry(ua_sess); | |
fad1ed2f | 2996 | /* The UST app session lock is held, registry shall not be null. */ |
7972aab2 DG |
2997 | assert(registry); |
2998 | ||
2999 | /* Create and add a new channel registry to session. */ | |
3000 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd | 3001 | if (ret < 0) { |
f14256d6 MD |
3002 | ERR("Error creating the UST channel \"%s\" registry instance", |
3003 | ua_chan->name); | |
78f0bacd DG |
3004 | goto error; |
3005 | } | |
3006 | ||
7972aab2 DG |
3007 | /* Create and get channel on the consumer side. */ |
3008 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
3009 | app->bits_per_long, registry); | |
3010 | if (ret < 0) { | |
f14256d6 MD |
3011 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
3012 | ua_chan->name); | |
7972aab2 DG |
3013 | goto error; |
3014 | } | |
3015 | ||
3016 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
3017 | if (ret < 0) { | |
a7169585 MD |
3018 | if (ret != -ENOTCONN) { |
3019 | ERR("Error sending channel to application"); | |
3020 | } | |
7972aab2 DG |
3021 | goto error; |
3022 | } | |
8535a6d9 | 3023 | |
e9404c27 JG |
3024 | session = session_find_by_id(ua_sess->tracing_id); |
3025 | assert(session); | |
3026 | ||
3027 | chan_reg_key = ua_chan->key; | |
3028 | pthread_mutex_lock(®istry->lock); | |
3029 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
3030 | assert(chan_reg); | |
3031 | chan_reg->consumer_key = ua_chan->key; | |
3032 | pthread_mutex_unlock(®istry->lock); | |
3033 | ||
3034 | cmd_ret = notification_thread_command_add_channel( | |
3035 | notification_thread_handle, session->name, | |
3036 | ua_sess->euid, ua_sess->egid, | |
3037 | ua_chan->name, | |
3038 | ua_chan->key, | |
3039 | LTTNG_DOMAIN_UST, | |
3040 | ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf); | |
3041 | if (cmd_ret != LTTNG_OK) { | |
3042 | ret = - (int) cmd_ret; | |
3043 | ERR("Failed to add channel to notification thread"); | |
3044 | goto error; | |
3045 | } | |
3046 | ||
78f0bacd | 3047 | error: |
7972aab2 | 3048 | rcu_read_unlock(); |
78f0bacd DG |
3049 | return ret; |
3050 | } | |
3051 | ||
3052 | /* | |
7972aab2 DG |
3053 | * From an already allocated ust app channel, create the channel buffers if |
3054 | * need and send it to the application. This MUST be called with a RCU read | |
3055 | * side lock acquired. | |
3056 | * | |
fad1ed2f JR |
3057 | * Called with UST app session lock held. |
3058 | * | |
a7169585 MD |
3059 | * Return 0 on success or else a negative value. Returns -ENOTCONN if |
3060 | * the application exited concurrently. | |
78f0bacd | 3061 | */ |
7972aab2 DG |
3062 | static int do_create_channel(struct ust_app *app, |
3063 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
3064 | struct ust_app_channel *ua_chan) | |
78f0bacd | 3065 | { |
7972aab2 | 3066 | int ret; |
78f0bacd | 3067 | |
7972aab2 DG |
3068 | assert(app); |
3069 | assert(usess); | |
3070 | assert(ua_sess); | |
3071 | assert(ua_chan); | |
3072 | ||
3073 | /* Handle buffer type before sending the channel to the application. */ | |
3074 | switch (usess->buffer_type) { | |
3075 | case LTTNG_BUFFER_PER_UID: | |
3076 | { | |
3077 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
3078 | if (ret < 0) { | |
3079 | goto error; | |
3080 | } | |
3081 | break; | |
3082 | } | |
3083 | case LTTNG_BUFFER_PER_PID: | |
3084 | { | |
3085 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
3086 | if (ret < 0) { | |
3087 | goto error; | |
3088 | } | |
3089 | break; | |
3090 | } | |
3091 | default: | |
3092 | assert(0); | |
3093 | ret = -EINVAL; | |
78f0bacd DG |
3094 | goto error; |
3095 | } | |
3096 | ||
7972aab2 DG |
3097 | /* Initialize ust objd object using the received handle and add it. */ |
3098 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
3099 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 3100 | |
7972aab2 DG |
3101 | /* If channel is not enabled, disable it on the tracer */ |
3102 | if (!ua_chan->enabled) { | |
3103 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
3104 | if (ret < 0) { | |
3105 | goto error; | |
3106 | } | |
78f0bacd DG |
3107 | } |
3108 | ||
3109 | error: | |
3110 | return ret; | |
3111 | } | |
3112 | ||
284d8f55 | 3113 | /* |
4d710ac2 DG |
3114 | * Create UST app channel and create it on the tracer. Set ua_chanp of the |
3115 | * newly created channel if not NULL. | |
d0b96690 | 3116 | * |
36b588ed | 3117 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 | 3118 | * |
a7169585 MD |
3119 | * Return 0 on success or else a negative value. Returns -ENOTCONN if |
3120 | * the application exited concurrently. | |
284d8f55 | 3121 | */ |
4d710ac2 DG |
3122 | static int create_ust_app_channel(struct ust_app_session *ua_sess, |
3123 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
7972aab2 | 3124 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 3125 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
3126 | { |
3127 | int ret = 0; | |
bec39940 DG |
3128 | struct lttng_ht_iter iter; |
3129 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
3130 | struct ust_app_channel *ua_chan; |
3131 | ||
3132 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3133 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
3134 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 3135 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 3136 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 3137 | goto end; |
5b4a0ec0 DG |
3138 | } |
3139 | ||
d0b96690 | 3140 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
3141 | if (ua_chan == NULL) { |
3142 | /* Only malloc can fail here */ | |
4d710ac2 | 3143 | ret = -ENOMEM; |
094d1690 | 3144 | goto error_alloc; |
fc34caaa DG |
3145 | } |
3146 | shadow_copy_channel(ua_chan, uchan); | |
3147 | ||
ffe60014 DG |
3148 | /* Set channel type. */ |
3149 | ua_chan->attr.type = type; | |
3150 | ||
7972aab2 | 3151 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
5b4a0ec0 DG |
3152 | if (ret < 0) { |
3153 | goto error; | |
3154 | } | |
3155 | ||
fc34caaa | 3156 | DBG2("UST app create channel %s for PID %d completed", ua_chan->name, |
852d0037 | 3157 | app->pid); |
fc34caaa | 3158 | |
d0b96690 DG |
3159 | /* Only add the channel if successful on the tracer side. */ |
3160 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
fc34caaa | 3161 | end: |
4d710ac2 DG |
3162 | if (ua_chanp) { |
3163 | *ua_chanp = ua_chan; | |
3164 | } | |
3165 | ||
3166 | /* Everything went well. */ | |
3167 | return 0; | |
5b4a0ec0 DG |
3168 | |
3169 | error: | |
d0b96690 | 3170 | delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app); |
094d1690 | 3171 | error_alloc: |
4d710ac2 | 3172 | return ret; |
5b4a0ec0 DG |
3173 | } |
3174 | ||
3175 | /* | |
3176 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
3177 | * |
3178 | * Called with ust app session mutex held. | |
5b4a0ec0 | 3179 | */ |
edb67388 DG |
3180 | static |
3181 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
3182 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
3183 | struct ust_app *app) | |
284d8f55 | 3184 | { |
edb67388 | 3185 | int ret = 0; |
5b4a0ec0 | 3186 | struct ust_app_event *ua_event; |
284d8f55 | 3187 | |
5b4a0ec0 | 3188 | /* Get event node */ |
18eace3b | 3189 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 3190 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 3191 | if (ua_event != NULL) { |
fc34caaa | 3192 | ret = -EEXIST; |
edb67388 DG |
3193 | goto end; |
3194 | } | |
5b4a0ec0 | 3195 | |
edb67388 DG |
3196 | /* Does not exist so create one */ |
3197 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); | |
3198 | if (ua_event == NULL) { | |
3199 | /* Only malloc can failed so something is really wrong */ | |
3200 | ret = -ENOMEM; | |
fc34caaa | 3201 | goto end; |
5b4a0ec0 | 3202 | } |
edb67388 | 3203 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 3204 | |
edb67388 | 3205 | /* Create it on the tracer side */ |
5b4a0ec0 | 3206 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 3207 | if (ret < 0) { |
fc34caaa | 3208 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 3209 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
3210 | goto error; |
3211 | } | |
3212 | ||
d0b96690 | 3213 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 3214 | |
fc34caaa | 3215 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 3216 | app->pid); |
7f79d3a1 | 3217 | |
edb67388 | 3218 | end: |
fc34caaa DG |
3219 | return ret; |
3220 | ||
5b4a0ec0 | 3221 | error: |
fc34caaa | 3222 | /* Valid. Calling here is already in a read side lock */ |
fb45065e | 3223 | delete_ust_app_event(-1, ua_event, app); |
edb67388 | 3224 | return ret; |
5b4a0ec0 DG |
3225 | } |
3226 | ||
3227 | /* | |
3228 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 3229 | * |
7972aab2 | 3230 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
3231 | */ |
3232 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
ad7a9107 | 3233 | struct ust_app *app, struct consumer_output *consumer) |
5b4a0ec0 DG |
3234 | { |
3235 | int ret = 0; | |
ffe60014 | 3236 | struct ust_app_channel *metadata; |
d88aee68 | 3237 | struct consumer_socket *socket; |
7972aab2 | 3238 | struct ust_registry_session *registry; |
5b4a0ec0 | 3239 | |
ffe60014 DG |
3240 | assert(ua_sess); |
3241 | assert(app); | |
d88aee68 | 3242 | assert(consumer); |
5b4a0ec0 | 3243 | |
7972aab2 | 3244 | registry = get_session_registry(ua_sess); |
fad1ed2f | 3245 | /* The UST app session is held registry shall not be null. */ |
7972aab2 DG |
3246 | assert(registry); |
3247 | ||
ce34fcd0 MD |
3248 | pthread_mutex_lock(®istry->lock); |
3249 | ||
1b532a60 DG |
3250 | /* Metadata already exists for this registry or it was closed previously */ |
3251 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
3252 | ret = 0; |
3253 | goto error; | |
5b4a0ec0 DG |
3254 | } |
3255 | ||
ffe60014 | 3256 | /* Allocate UST metadata */ |
d0b96690 | 3257 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
3258 | if (!metadata) { |
3259 | /* malloc() failed */ | |
3260 | ret = -ENOMEM; | |
3261 | goto error; | |
3262 | } | |
5b4a0ec0 | 3263 | |
ad7a9107 | 3264 | memcpy(&metadata->attr, &ua_sess->metadata_attr, sizeof(metadata->attr)); |
5b4a0ec0 | 3265 | |
7972aab2 DG |
3266 | /* Need one fd for the channel. */ |
3267 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
3268 | if (ret < 0) { | |
3269 | ERR("Exhausted number of available FD upon create metadata"); | |
3270 | goto error; | |
3271 | } | |
3272 | ||
4dc3dfc5 DG |
3273 | /* Get the right consumer socket for the application. */ |
3274 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
3275 | if (!socket) { | |
3276 | ret = -EINVAL; | |
3277 | goto error_consumer; | |
3278 | } | |
3279 | ||
331744e3 JD |
3280 | /* |
3281 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
3282 | * to the registry *before* we ask the consumer so we avoid the race of the | |
3283 | * consumer requesting the metadata and the ask_channel call on our side | |
3284 | * did not returned yet. | |
3285 | */ | |
3286 | registry->metadata_key = metadata->key; | |
3287 | ||
d88aee68 DG |
3288 | /* |
3289 | * Ask the metadata channel creation to the consumer. The metadata object | |
3290 | * will be created by the consumer and kept their. However, the stream is | |
3291 | * never added or monitored until we do a first push metadata to the | |
3292 | * consumer. | |
3293 | */ | |
7972aab2 DG |
3294 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
3295 | registry); | |
d88aee68 | 3296 | if (ret < 0) { |
f2a444f1 DG |
3297 | /* Nullify the metadata key so we don't try to close it later on. */ |
3298 | registry->metadata_key = 0; | |
d88aee68 DG |
3299 | goto error_consumer; |
3300 | } | |
3301 | ||
3302 | /* | |
3303 | * The setup command will make the metadata stream be sent to the relayd, | |
3304 | * if applicable, and the thread managing the metadatas. This is important | |
3305 | * because after this point, if an error occurs, the only way the stream | |
3306 | * can be deleted is to be monitored in the consumer. | |
3307 | */ | |
7972aab2 | 3308 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 3309 | if (ret < 0) { |
f2a444f1 DG |
3310 | /* Nullify the metadata key so we don't try to close it later on. */ |
3311 | registry->metadata_key = 0; | |
d88aee68 | 3312 | goto error_consumer; |
5b4a0ec0 DG |
3313 | } |
3314 | ||
7972aab2 DG |
3315 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
3316 | metadata->key, app->pid); | |
5b4a0ec0 | 3317 | |
d88aee68 | 3318 | error_consumer: |
b80f0b6c | 3319 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 3320 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 3321 | error: |
ce34fcd0 | 3322 | pthread_mutex_unlock(®istry->lock); |
ffe60014 | 3323 | return ret; |
5b4a0ec0 DG |
3324 | } |
3325 | ||
5b4a0ec0 | 3326 | /* |
d88aee68 DG |
3327 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
3328 | * acquired before calling this function. | |
5b4a0ec0 DG |
3329 | */ |
3330 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
3331 | { | |
d88aee68 | 3332 | struct ust_app *app = NULL; |
bec39940 DG |
3333 | struct lttng_ht_node_ulong *node; |
3334 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 3335 | |
bec39940 DG |
3336 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
3337 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
3338 | if (node == NULL) { |
3339 | DBG2("UST app no found with pid %d", pid); | |
3340 | goto error; | |
3341 | } | |
5b4a0ec0 DG |
3342 | |
3343 | DBG2("Found UST app by pid %d", pid); | |
3344 | ||
d88aee68 | 3345 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
3346 | |
3347 | error: | |
d88aee68 | 3348 | return app; |
5b4a0ec0 DG |
3349 | } |
3350 | ||
d88aee68 DG |
3351 | /* |
3352 | * Allocate and init an UST app object using the registration information and | |
3353 | * the command socket. This is called when the command socket connects to the | |
3354 | * session daemon. | |
3355 | * | |
3356 | * The object is returned on success or else NULL. | |
3357 | */ | |
d0b96690 | 3358 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 3359 | { |
d0b96690 DG |
3360 | struct ust_app *lta = NULL; |
3361 | ||
3362 | assert(msg); | |
3363 | assert(sock >= 0); | |
3364 | ||
3365 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 3366 | |
173af62f DG |
3367 | if ((msg->bits_per_long == 64 && |
3368 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
3369 | || (msg->bits_per_long == 32 && | |
3370 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 3371 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
3372 | "%d-bit long, but no consumerd for this size is available.\n", |
3373 | msg->name, msg->pid, msg->bits_per_long); | |
3374 | goto error; | |
3f2c5fcc | 3375 | } |
d0b96690 | 3376 | |
5b4a0ec0 DG |
3377 | lta = zmalloc(sizeof(struct ust_app)); |
3378 | if (lta == NULL) { | |
3379 | PERROR("malloc"); | |
d0b96690 | 3380 | goto error; |
5b4a0ec0 DG |
3381 | } |
3382 | ||
3383 | lta->ppid = msg->ppid; | |
3384 | lta->uid = msg->uid; | |
3385 | lta->gid = msg->gid; | |
d0b96690 | 3386 | |
7753dea8 | 3387 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
3388 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
3389 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
3390 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
3391 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
3392 | lta->long_alignment = msg->long_alignment; | |
3393 | lta->byte_order = msg->byte_order; | |
3394 | ||
5b4a0ec0 DG |
3395 | lta->v_major = msg->major; |
3396 | lta->v_minor = msg->minor; | |
d9bf3ca4 | 3397 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 | 3398 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
10b56aef | 3399 | lta->ust_sessions_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3400 | lta->notify_sock = -1; |
d88aee68 DG |
3401 | |
3402 | /* Copy name and make sure it's NULL terminated. */ | |
3403 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
3404 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
3405 | ||
3406 | /* | |
3407 | * Before this can be called, when receiving the registration information, | |
3408 | * the application compatibility is checked. So, at this point, the | |
3409 | * application can work with this session daemon. | |
3410 | */ | |
d0b96690 | 3411 | lta->compatible = 1; |
5b4a0ec0 | 3412 | |
852d0037 | 3413 | lta->pid = msg->pid; |
d0b96690 | 3414 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 3415 | lta->sock = sock; |
fb45065e | 3416 | pthread_mutex_init(<a->sock_lock, NULL); |
d0b96690 | 3417 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 3418 | |
d42f20df | 3419 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
d0b96690 DG |
3420 | error: |
3421 | return lta; | |
3422 | } | |
3423 | ||
d88aee68 DG |
3424 | /* |
3425 | * For a given application object, add it to every hash table. | |
3426 | */ | |
d0b96690 DG |
3427 | void ust_app_add(struct ust_app *app) |
3428 | { | |
3429 | assert(app); | |
3430 | assert(app->notify_sock >= 0); | |
3431 | ||
5b4a0ec0 | 3432 | rcu_read_lock(); |
852d0037 DG |
3433 | |
3434 | /* | |
3435 | * On a re-registration, we want to kick out the previous registration of | |
3436 | * that pid | |
3437 | */ | |
d0b96690 | 3438 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
3439 | |
3440 | /* | |
3441 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
3442 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
3443 | * already in the table. | |
3444 | */ | |
d0b96690 | 3445 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 3446 | |
d0b96690 DG |
3447 | /* Add application to the notify socket hash table. */ |
3448 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
3449 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 3450 | |
d0b96690 | 3451 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
3452 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
3453 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
3454 | app->v_minor); | |
5b4a0ec0 | 3455 | |
d0b96690 DG |
3456 | rcu_read_unlock(); |
3457 | } | |
3458 | ||
d88aee68 DG |
3459 | /* |
3460 | * Set the application version into the object. | |
3461 | * | |
3462 | * Return 0 on success else a negative value either an errno code or a | |
3463 | * LTTng-UST error code. | |
3464 | */ | |
d0b96690 DG |
3465 | int ust_app_version(struct ust_app *app) |
3466 | { | |
d88aee68 DG |
3467 | int ret; |
3468 | ||
d0b96690 | 3469 | assert(app); |
d88aee68 | 3470 | |
fb45065e | 3471 | pthread_mutex_lock(&app->sock_lock); |
d88aee68 | 3472 | ret = ustctl_tracer_version(app->sock, &app->version); |
fb45065e | 3473 | pthread_mutex_unlock(&app->sock_lock); |
d88aee68 DG |
3474 | if (ret < 0) { |
3475 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
5368d366 | 3476 | ERR("UST app %d version failed with ret %d", app->sock, ret); |
d88aee68 | 3477 | } else { |
5368d366 | 3478 | DBG3("UST app %d version failed. Application is dead", app->sock); |
d88aee68 DG |
3479 | } |
3480 | } | |
3481 | ||
3482 | return ret; | |
5b4a0ec0 DG |
3483 | } |
3484 | ||
3485 | /* | |
3486 | * Unregister app by removing it from the global traceable app list and freeing | |
3487 | * the data struct. | |
3488 | * | |
3489 | * The socket is already closed at this point so no close to sock. | |
3490 | */ | |
3491 | void ust_app_unregister(int sock) | |
3492 | { | |
3493 | struct ust_app *lta; | |
bec39940 | 3494 | struct lttng_ht_node_ulong *node; |
c4b88406 | 3495 | struct lttng_ht_iter ust_app_sock_iter; |
bec39940 | 3496 | struct lttng_ht_iter iter; |
d42f20df | 3497 | struct ust_app_session *ua_sess; |
525b0740 | 3498 | int ret; |
5b4a0ec0 DG |
3499 | |
3500 | rcu_read_lock(); | |
886459c6 | 3501 | |
5b4a0ec0 | 3502 | /* Get the node reference for a call_rcu */ |
c4b88406 MD |
3503 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &ust_app_sock_iter); |
3504 | node = lttng_ht_iter_get_node_ulong(&ust_app_sock_iter); | |
d0b96690 | 3505 | assert(node); |
284d8f55 | 3506 | |
852d0037 | 3507 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
3508 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
3509 | ||
d88aee68 | 3510 | /* |
ce34fcd0 MD |
3511 | * For per-PID buffers, perform "push metadata" and flush all |
3512 | * application streams before removing app from hash tables, | |
3513 | * ensuring proper behavior of data_pending check. | |
c4b88406 | 3514 | * Remove sessions so they are not visible during deletion. |
d88aee68 | 3515 | */ |
d42f20df DG |
3516 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, |
3517 | node.node) { | |
7972aab2 DG |
3518 | struct ust_registry_session *registry; |
3519 | ||
d42f20df DG |
3520 | ret = lttng_ht_del(lta->sessions, &iter); |
3521 | if (ret) { | |
3522 | /* The session was already removed so scheduled for teardown. */ | |
3523 | continue; | |
3524 | } | |
3525 | ||
ce34fcd0 MD |
3526 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { |
3527 | (void) ust_app_flush_app_session(lta, ua_sess); | |
3528 | } | |
c4b88406 | 3529 | |
d42f20df DG |
3530 | /* |
3531 | * Add session to list for teardown. This is safe since at this point we | |
3532 | * are the only one using this list. | |
3533 | */ | |
d88aee68 DG |
3534 | pthread_mutex_lock(&ua_sess->lock); |
3535 | ||
b161602a MD |
3536 | if (ua_sess->deleted) { |
3537 | pthread_mutex_unlock(&ua_sess->lock); | |
3538 | continue; | |
3539 | } | |
3540 | ||
d88aee68 DG |
3541 | /* |
3542 | * Normally, this is done in the delete session process which is | |
3543 | * executed in the call rcu below. However, upon registration we can't | |
3544 | * afford to wait for the grace period before pushing data or else the | |
3545 | * data pending feature can race between the unregistration and stop | |
3546 | * command where the data pending command is sent *before* the grace | |
3547 | * period ended. | |
3548 | * | |
3549 | * The close metadata below nullifies the metadata pointer in the | |
3550 | * session so the delete session will NOT push/close a second time. | |
3551 | */ | |
7972aab2 | 3552 | registry = get_session_registry(ua_sess); |
ce34fcd0 | 3553 | if (registry) { |
7972aab2 DG |
3554 | /* Push metadata for application before freeing the application. */ |
3555 | (void) push_metadata(registry, ua_sess->consumer); | |
3556 | ||
3557 | /* | |
3558 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
3559 | * metadata only on destroy trace session in this case. Also, the |
3560 | * previous push metadata could have flag the metadata registry to | |
3561 | * close so don't send a close command if closed. | |
7972aab2 | 3562 | */ |
ce34fcd0 | 3563 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
3564 | /* And ask to close it for this session registry. */ |
3565 | (void) close_metadata(registry, ua_sess->consumer); | |
3566 | } | |
3567 | } | |
d42f20df | 3568 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
c4b88406 | 3569 | |
d88aee68 | 3570 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
3571 | } |
3572 | ||
c4b88406 MD |
3573 | /* Remove application from PID hash table */ |
3574 | ret = lttng_ht_del(ust_app_ht_by_sock, &ust_app_sock_iter); | |
3575 | assert(!ret); | |
3576 | ||
3577 | /* | |
3578 | * Remove application from notify hash table. The thread handling the | |
3579 | * notify socket could have deleted the node so ignore on error because | |
3580 | * either way it's valid. The close of that socket is handled by the other | |
3581 | * thread. | |
3582 | */ | |
3583 | iter.iter.node = <a->notify_sock_n.node; | |
3584 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3585 | ||
3586 | /* | |
3587 | * Ignore return value since the node might have been removed before by an | |
3588 | * add replace during app registration because the PID can be reassigned by | |
3589 | * the OS. | |
3590 | */ | |
3591 | iter.iter.node = <a->pid_n.node; | |
3592 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3593 | if (ret) { | |
3594 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
3595 | lta->pid); | |
3596 | } | |
3597 | ||
852d0037 DG |
3598 | /* Free memory */ |
3599 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
3600 | ||
5b4a0ec0 DG |
3601 | rcu_read_unlock(); |
3602 | return; | |
284d8f55 DG |
3603 | } |
3604 | ||
5b4a0ec0 DG |
3605 | /* |
3606 | * Fill events array with all events name of all registered apps. | |
3607 | */ | |
3608 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 3609 | { |
5b4a0ec0 DG |
3610 | int ret, handle; |
3611 | size_t nbmem, count = 0; | |
bec39940 | 3612 | struct lttng_ht_iter iter; |
5b4a0ec0 | 3613 | struct ust_app *app; |
c617c0c6 | 3614 | struct lttng_event *tmp_event; |
421cb601 | 3615 | |
5b4a0ec0 | 3616 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
3617 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
3618 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
3619 | PERROR("zmalloc ust app events"); |
3620 | ret = -ENOMEM; | |
421cb601 DG |
3621 | goto error; |
3622 | } | |
3623 | ||
5b4a0ec0 | 3624 | rcu_read_lock(); |
421cb601 | 3625 | |
852d0037 | 3626 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 3627 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 3628 | |
840cb59c | 3629 | health_code_update(); |
86acf0da | 3630 | |
e0c7ec2b DG |
3631 | if (!app->compatible) { |
3632 | /* | |
3633 | * TODO: In time, we should notice the caller of this error by | |
3634 | * telling him that this is a version error. | |
3635 | */ | |
3636 | continue; | |
3637 | } | |
fb45065e | 3638 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 3639 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 3640 | if (handle < 0) { |
ffe60014 DG |
3641 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3642 | ERR("UST app list events getting handle failed for app pid %d", | |
3643 | app->pid); | |
3644 | } | |
fb45065e | 3645 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 DG |
3646 | continue; |
3647 | } | |
421cb601 | 3648 | |
852d0037 | 3649 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 3650 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3651 | /* Handle ustctl error. */ |
3652 | if (ret < 0) { | |
fb45065e MD |
3653 | int release_ret; |
3654 | ||
a2ba1ab0 | 3655 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3656 | ERR("UST app tp list get failed for app %d with ret %d", |
3657 | app->sock, ret); | |
3658 | } else { | |
3659 | DBG3("UST app tp list get failed. Application is dead"); | |
3757b385 DG |
3660 | /* |
3661 | * This is normal behavior, an application can die during the | |
3662 | * creation process. Don't report an error so the execution can | |
3663 | * continue normally. Continue normal execution. | |
3664 | */ | |
3665 | break; | |
ffe60014 | 3666 | } |
98f595d4 | 3667 | free(tmp_event); |
fb45065e | 3668 | release_ret = ustctl_release_handle(app->sock, handle); |
68313703 JG |
3669 | if (release_ret < 0 && |
3670 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3671 | release_ret != -EPIPE) { | |
fb45065e MD |
3672 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3673 | } | |
3674 | pthread_mutex_unlock(&app->sock_lock); | |
ffe60014 DG |
3675 | goto rcu_error; |
3676 | } | |
3677 | ||
840cb59c | 3678 | health_code_update(); |
815564d8 | 3679 | if (count >= nbmem) { |
d7b3776f | 3680 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3681 | struct lttng_event *new_tmp_event; |
3682 | size_t new_nbmem; | |
3683 | ||
3684 | new_nbmem = nbmem << 1; | |
3685 | DBG2("Reallocating event list from %zu to %zu entries", | |
3686 | nbmem, new_nbmem); | |
3687 | new_tmp_event = realloc(tmp_event, | |
3688 | new_nbmem * sizeof(struct lttng_event)); | |
3689 | if (new_tmp_event == NULL) { | |
fb45065e MD |
3690 | int release_ret; |
3691 | ||
5b4a0ec0 | 3692 | PERROR("realloc ust app events"); |
c617c0c6 | 3693 | free(tmp_event); |
5b4a0ec0 | 3694 | ret = -ENOMEM; |
fb45065e | 3695 | release_ret = ustctl_release_handle(app->sock, handle); |
68313703 JG |
3696 | if (release_ret < 0 && |
3697 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3698 | release_ret != -EPIPE) { | |
fb45065e MD |
3699 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3700 | } | |
3701 | pthread_mutex_unlock(&app->sock_lock); | |
5b4a0ec0 DG |
3702 | goto rcu_error; |
3703 | } | |
53efb85a MD |
3704 | /* Zero the new memory */ |
3705 | memset(new_tmp_event + nbmem, 0, | |
3706 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
3707 | nbmem = new_nbmem; | |
3708 | tmp_event = new_tmp_event; | |
5b4a0ec0 | 3709 | } |
c617c0c6 MD |
3710 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
3711 | tmp_event[count].loglevel = uiter.loglevel; | |
3712 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
3713 | tmp_event[count].pid = app->pid; | |
3714 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 3715 | count++; |
421cb601 | 3716 | } |
fb45065e MD |
3717 | ret = ustctl_release_handle(app->sock, handle); |
3718 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 | 3719 | if (ret < 0 && ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
fb45065e MD |
3720 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
3721 | } | |
421cb601 DG |
3722 | } |
3723 | ||
5b4a0ec0 | 3724 | ret = count; |
c617c0c6 | 3725 | *events = tmp_event; |
421cb601 | 3726 | |
5b4a0ec0 | 3727 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 3728 | |
5b4a0ec0 DG |
3729 | rcu_error: |
3730 | rcu_read_unlock(); | |
421cb601 | 3731 | error: |
840cb59c | 3732 | health_code_update(); |
5b4a0ec0 | 3733 | return ret; |
421cb601 DG |
3734 | } |
3735 | ||
f37d259d MD |
3736 | /* |
3737 | * Fill events array with all events name of all registered apps. | |
3738 | */ | |
3739 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
3740 | { | |
3741 | int ret, handle; | |
3742 | size_t nbmem, count = 0; | |
3743 | struct lttng_ht_iter iter; | |
3744 | struct ust_app *app; | |
c617c0c6 | 3745 | struct lttng_event_field *tmp_event; |
f37d259d MD |
3746 | |
3747 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
3748 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
3749 | if (tmp_event == NULL) { | |
f37d259d MD |
3750 | PERROR("zmalloc ust app event fields"); |
3751 | ret = -ENOMEM; | |
3752 | goto error; | |
3753 | } | |
3754 | ||
3755 | rcu_read_lock(); | |
3756 | ||
3757 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3758 | struct lttng_ust_field_iter uiter; | |
3759 | ||
840cb59c | 3760 | health_code_update(); |
86acf0da | 3761 | |
f37d259d MD |
3762 | if (!app->compatible) { |
3763 | /* | |
3764 | * TODO: In time, we should notice the caller of this error by | |
3765 | * telling him that this is a version error. | |
3766 | */ | |
3767 | continue; | |
3768 | } | |
fb45065e | 3769 | pthread_mutex_lock(&app->sock_lock); |
f37d259d MD |
3770 | handle = ustctl_tracepoint_field_list(app->sock); |
3771 | if (handle < 0) { | |
ffe60014 DG |
3772 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3773 | ERR("UST app list field getting handle failed for app pid %d", | |
3774 | app->pid); | |
3775 | } | |
fb45065e | 3776 | pthread_mutex_unlock(&app->sock_lock); |
f37d259d MD |
3777 | continue; |
3778 | } | |
3779 | ||
3780 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 3781 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3782 | /* Handle ustctl error. */ |
3783 | if (ret < 0) { | |
fb45065e MD |
3784 | int release_ret; |
3785 | ||
a2ba1ab0 | 3786 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3787 | ERR("UST app tp list field failed for app %d with ret %d", |
3788 | app->sock, ret); | |
3789 | } else { | |
3790 | DBG3("UST app tp list field failed. Application is dead"); | |
3757b385 DG |
3791 | /* |
3792 | * This is normal behavior, an application can die during the | |
3793 | * creation process. Don't report an error so the execution can | |
98f595d4 | 3794 | * continue normally. Reset list and count for next app. |
3757b385 DG |
3795 | */ |
3796 | break; | |
ffe60014 | 3797 | } |
98f595d4 | 3798 | free(tmp_event); |
fb45065e MD |
3799 | release_ret = ustctl_release_handle(app->sock, handle); |
3800 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
3801 | if (release_ret < 0 && |
3802 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3803 | release_ret != -EPIPE) { | |
fb45065e MD |
3804 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3805 | } | |
ffe60014 DG |
3806 | goto rcu_error; |
3807 | } | |
3808 | ||
840cb59c | 3809 | health_code_update(); |
f37d259d | 3810 | if (count >= nbmem) { |
d7b3776f | 3811 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3812 | struct lttng_event_field *new_tmp_event; |
3813 | size_t new_nbmem; | |
3814 | ||
3815 | new_nbmem = nbmem << 1; | |
3816 | DBG2("Reallocating event field list from %zu to %zu entries", | |
3817 | nbmem, new_nbmem); | |
3818 | new_tmp_event = realloc(tmp_event, | |
3819 | new_nbmem * sizeof(struct lttng_event_field)); | |
3820 | if (new_tmp_event == NULL) { | |
fb45065e MD |
3821 | int release_ret; |
3822 | ||
f37d259d | 3823 | PERROR("realloc ust app event fields"); |
c617c0c6 | 3824 | free(tmp_event); |
f37d259d | 3825 | ret = -ENOMEM; |
fb45065e MD |
3826 | release_ret = ustctl_release_handle(app->sock, handle); |
3827 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
3828 | if (release_ret && |
3829 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3830 | release_ret != -EPIPE) { | |
fb45065e MD |
3831 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3832 | } | |
f37d259d MD |
3833 | goto rcu_error; |
3834 | } | |
53efb85a MD |
3835 | /* Zero the new memory */ |
3836 | memset(new_tmp_event + nbmem, 0, | |
3837 | (new_nbmem - nbmem) * sizeof(struct lttng_event_field)); | |
3838 | nbmem = new_nbmem; | |
3839 | tmp_event = new_tmp_event; | |
f37d259d | 3840 | } |
f37d259d | 3841 | |
c617c0c6 | 3842 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
2e84128e DG |
3843 | /* Mapping between these enums matches 1 to 1. */ |
3844 | tmp_event[count].type = (enum lttng_event_field_type) uiter.type; | |
c617c0c6 | 3845 | tmp_event[count].nowrite = uiter.nowrite; |
f37d259d | 3846 | |
c617c0c6 MD |
3847 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
3848 | tmp_event[count].event.loglevel = uiter.loglevel; | |
2e84128e | 3849 | tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; |
c617c0c6 MD |
3850 | tmp_event[count].event.pid = app->pid; |
3851 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
3852 | count++; |
3853 | } | |
fb45065e MD |
3854 | ret = ustctl_release_handle(app->sock, handle); |
3855 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
3856 | if (ret < 0 && |
3857 | ret != -LTTNG_UST_ERR_EXITING && | |
3858 | ret != -EPIPE) { | |
fb45065e MD |
3859 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
3860 | } | |
f37d259d MD |
3861 | } |
3862 | ||
3863 | ret = count; | |
c617c0c6 | 3864 | *fields = tmp_event; |
f37d259d MD |
3865 | |
3866 | DBG2("UST app list event fields done (%zu events)", count); | |
3867 | ||
3868 | rcu_error: | |
3869 | rcu_read_unlock(); | |
3870 | error: | |
840cb59c | 3871 | health_code_update(); |
f37d259d MD |
3872 | return ret; |
3873 | } | |
3874 | ||
5b4a0ec0 DG |
3875 | /* |
3876 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
3877 | * |
3878 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
3879 | */ |
3880 | void ust_app_clean_list(void) | |
421cb601 | 3881 | { |
5b4a0ec0 | 3882 | int ret; |
659ed79f | 3883 | struct ust_app *app; |
bec39940 | 3884 | struct lttng_ht_iter iter; |
421cb601 | 3885 | |
5b4a0ec0 | 3886 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3887 | |
5b4a0ec0 | 3888 | rcu_read_lock(); |
421cb601 | 3889 | |
f1b711c4 MD |
3890 | if (ust_app_ht) { |
3891 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3892 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3893 | assert(!ret); | |
3894 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
3895 | } | |
421cb601 DG |
3896 | } |
3897 | ||
852d0037 | 3898 | /* Cleanup socket hash table */ |
f1b711c4 MD |
3899 | if (ust_app_ht_by_sock) { |
3900 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, | |
3901 | sock_n.node) { | |
3902 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); | |
3903 | assert(!ret); | |
3904 | } | |
bec39940 | 3905 | } |
852d0037 | 3906 | |
d88aee68 | 3907 | /* Cleanup notify socket hash table */ |
f1b711c4 MD |
3908 | if (ust_app_ht_by_notify_sock) { |
3909 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3910 | notify_sock_n.node) { | |
3911 | ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3912 | assert(!ret); | |
3913 | } | |
d88aee68 | 3914 | } |
36b588ed | 3915 | rcu_read_unlock(); |
d88aee68 | 3916 | |
bec39940 | 3917 | /* Destroy is done only when the ht is empty */ |
f1b711c4 MD |
3918 | if (ust_app_ht) { |
3919 | ht_cleanup_push(ust_app_ht); | |
3920 | } | |
3921 | if (ust_app_ht_by_sock) { | |
3922 | ht_cleanup_push(ust_app_ht_by_sock); | |
3923 | } | |
3924 | if (ust_app_ht_by_notify_sock) { | |
3925 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
3926 | } | |
5b4a0ec0 DG |
3927 | } |
3928 | ||
3929 | /* | |
3930 | * Init UST app hash table. | |
3931 | */ | |
57703f6e | 3932 | int ust_app_ht_alloc(void) |
5b4a0ec0 | 3933 | { |
bec39940 | 3934 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3935 | if (!ust_app_ht) { |
3936 | return -1; | |
3937 | } | |
852d0037 | 3938 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3939 | if (!ust_app_ht_by_sock) { |
3940 | return -1; | |
3941 | } | |
d0b96690 | 3942 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3943 | if (!ust_app_ht_by_notify_sock) { |
3944 | return -1; | |
3945 | } | |
3946 | return 0; | |
421cb601 DG |
3947 | } |
3948 | ||
78f0bacd DG |
3949 | /* |
3950 | * For a specific UST session, disable the channel for all registered apps. | |
3951 | */ | |
35a9059d | 3952 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3953 | struct ltt_ust_channel *uchan) |
3954 | { | |
3955 | int ret = 0; | |
bec39940 DG |
3956 | struct lttng_ht_iter iter; |
3957 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3958 | struct ust_app *app; |
3959 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3960 | struct ust_app_channel *ua_chan; |
78f0bacd DG |
3961 | |
3962 | if (usess == NULL || uchan == NULL) { | |
3963 | ERR("Disabling UST global channel with NULL values"); | |
3964 | ret = -1; | |
3965 | goto error; | |
3966 | } | |
3967 | ||
d9bf3ca4 | 3968 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 3969 | uchan->name, usess->id); |
78f0bacd DG |
3970 | |
3971 | rcu_read_lock(); | |
3972 | ||
3973 | /* For every registered applications */ | |
852d0037 | 3974 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3975 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3976 | if (!app->compatible) { |
3977 | /* | |
3978 | * TODO: In time, we should notice the caller of this error by | |
3979 | * telling him that this is a version error. | |
3980 | */ | |
3981 | continue; | |
3982 | } | |
78f0bacd DG |
3983 | ua_sess = lookup_session_by_app(usess, app); |
3984 | if (ua_sess == NULL) { | |
3985 | continue; | |
3986 | } | |
3987 | ||
8535a6d9 | 3988 | /* Get channel */ |
bec39940 DG |
3989 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3990 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
3991 | /* If the session if found for the app, the channel must be there */ |
3992 | assert(ua_chan_node); | |
3993 | ||
3994 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3995 | /* The channel must not be already disabled */ | |
3996 | assert(ua_chan->enabled == 1); | |
3997 | ||
3998 | /* Disable channel onto application */ | |
3999 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
4000 | if (ret < 0) { |
4001 | /* XXX: We might want to report this error at some point... */ | |
4002 | continue; | |
4003 | } | |
4004 | } | |
4005 | ||
4006 | rcu_read_unlock(); | |
4007 | ||
4008 | error: | |
4009 | return ret; | |
4010 | } | |
4011 | ||
4012 | /* | |
4013 | * For a specific UST session, enable the channel for all registered apps. | |
4014 | */ | |
35a9059d | 4015 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
4016 | struct ltt_ust_channel *uchan) |
4017 | { | |
4018 | int ret = 0; | |
bec39940 | 4019 | struct lttng_ht_iter iter; |
78f0bacd DG |
4020 | struct ust_app *app; |
4021 | struct ust_app_session *ua_sess; | |
4022 | ||
4023 | if (usess == NULL || uchan == NULL) { | |
4024 | ERR("Adding UST global channel to NULL values"); | |
4025 | ret = -1; | |
4026 | goto error; | |
4027 | } | |
4028 | ||
d9bf3ca4 | 4029 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 4030 | uchan->name, usess->id); |
78f0bacd DG |
4031 | |
4032 | rcu_read_lock(); | |
4033 | ||
4034 | /* For every registered applications */ | |
852d0037 | 4035 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4036 | if (!app->compatible) { |
4037 | /* | |
4038 | * TODO: In time, we should notice the caller of this error by | |
4039 | * telling him that this is a version error. | |
4040 | */ | |
4041 | continue; | |
4042 | } | |
78f0bacd DG |
4043 | ua_sess = lookup_session_by_app(usess, app); |
4044 | if (ua_sess == NULL) { | |
4045 | continue; | |
4046 | } | |
4047 | ||
4048 | /* Enable channel onto application */ | |
4049 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
4050 | if (ret < 0) { | |
4051 | /* XXX: We might want to report this error at some point... */ | |
4052 | continue; | |
4053 | } | |
4054 | } | |
4055 | ||
4056 | rcu_read_unlock(); | |
4057 | ||
4058 | error: | |
4059 | return ret; | |
4060 | } | |
4061 | ||
b0a40d28 DG |
4062 | /* |
4063 | * Disable an event in a channel and for a specific session. | |
4064 | */ | |
35a9059d DG |
4065 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
4066 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
4067 | { |
4068 | int ret = 0; | |
bec39940 | 4069 | struct lttng_ht_iter iter, uiter; |
700c5a9d | 4070 | struct lttng_ht_node_str *ua_chan_node; |
b0a40d28 DG |
4071 | struct ust_app *app; |
4072 | struct ust_app_session *ua_sess; | |
4073 | struct ust_app_channel *ua_chan; | |
4074 | struct ust_app_event *ua_event; | |
4075 | ||
4076 | DBG("UST app disabling event %s for all apps in channel " | |
d9bf3ca4 MD |
4077 | "%s for session id %" PRIu64, |
4078 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
4079 | |
4080 | rcu_read_lock(); | |
4081 | ||
4082 | /* For all registered applications */ | |
852d0037 | 4083 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4084 | if (!app->compatible) { |
4085 | /* | |
4086 | * TODO: In time, we should notice the caller of this error by | |
4087 | * telling him that this is a version error. | |
4088 | */ | |
4089 | continue; | |
4090 | } | |
b0a40d28 DG |
4091 | ua_sess = lookup_session_by_app(usess, app); |
4092 | if (ua_sess == NULL) { | |
4093 | /* Next app */ | |
4094 | continue; | |
4095 | } | |
4096 | ||
4097 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
4098 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4099 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 4100 | if (ua_chan_node == NULL) { |
d9bf3ca4 | 4101 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 4102 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
4103 | continue; |
4104 | } | |
4105 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4106 | ||
700c5a9d JR |
4107 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
4108 | uevent->filter, uevent->attr.loglevel, | |
4109 | uevent->exclusion); | |
4110 | if (ua_event == NULL) { | |
b0a40d28 | 4111 | DBG2("Event %s not found in channel %s for app pid %d." |
852d0037 | 4112 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
4113 | continue; |
4114 | } | |
b0a40d28 | 4115 | |
7f79d3a1 | 4116 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
4117 | if (ret < 0) { |
4118 | /* XXX: Report error someday... */ | |
4119 | continue; | |
4120 | } | |
4121 | } | |
4122 | ||
4123 | rcu_read_unlock(); | |
4124 | ||
4125 | return ret; | |
4126 | } | |
4127 | ||
421cb601 | 4128 | /* |
5b4a0ec0 | 4129 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 4130 | */ |
35a9059d | 4131 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
4132 | struct ltt_ust_channel *uchan) |
4133 | { | |
3d8ca23b | 4134 | int ret = 0, created; |
bec39940 | 4135 | struct lttng_ht_iter iter; |
48842b30 | 4136 | struct ust_app *app; |
3d8ca23b | 4137 | struct ust_app_session *ua_sess = NULL; |
48842b30 | 4138 | |
fc34caaa DG |
4139 | /* Very wrong code flow */ |
4140 | assert(usess); | |
4141 | assert(uchan); | |
421cb601 | 4142 | |
d9bf3ca4 | 4143 | DBG2("UST app adding channel %s to UST domain for session id %" PRIu64, |
a991f516 | 4144 | uchan->name, usess->id); |
48842b30 DG |
4145 | |
4146 | rcu_read_lock(); | |
421cb601 | 4147 | |
5b4a0ec0 | 4148 | /* For every registered applications */ |
852d0037 | 4149 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4150 | if (!app->compatible) { |
4151 | /* | |
4152 | * TODO: In time, we should notice the caller of this error by | |
4153 | * telling him that this is a version error. | |
4154 | */ | |
4155 | continue; | |
4156 | } | |
a9ad0c8f MD |
4157 | if (!trace_ust_pid_tracker_lookup(usess, app->pid)) { |
4158 | /* Skip. */ | |
4159 | continue; | |
4160 | } | |
4161 | ||
edb67388 DG |
4162 | /* |
4163 | * Create session on the tracer side and add it to app session HT. Note | |
4164 | * that if session exist, it will simply return a pointer to the ust | |
4165 | * app session. | |
4166 | */ | |
3d8ca23b DG |
4167 | ret = create_ust_app_session(usess, app, &ua_sess, &created); |
4168 | if (ret < 0) { | |
4169 | switch (ret) { | |
4170 | case -ENOTCONN: | |
4171 | /* | |
4172 | * The application's socket is not valid. Either a bad socket | |
4173 | * or a timeout on it. We can't inform the caller that for a | |
4174 | * specific app, the session failed so lets continue here. | |
4175 | */ | |
a7169585 | 4176 | ret = 0; /* Not an error. */ |
3d8ca23b DG |
4177 | continue; |
4178 | case -ENOMEM: | |
4179 | default: | |
4180 | goto error_rcu_unlock; | |
4181 | } | |
48842b30 | 4182 | } |
3d8ca23b | 4183 | assert(ua_sess); |
48842b30 | 4184 | |
d0b96690 | 4185 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
4186 | |
4187 | if (ua_sess->deleted) { | |
4188 | pthread_mutex_unlock(&ua_sess->lock); | |
4189 | continue; | |
4190 | } | |
4191 | ||
d65d2de8 DG |
4192 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, |
4193 | sizeof(uchan->name))) { | |
ad7a9107 DG |
4194 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, &uchan->attr); |
4195 | ret = 0; | |
d65d2de8 DG |
4196 | } else { |
4197 | /* Create channel onto application. We don't need the chan ref. */ | |
4198 | ret = create_ust_app_channel(ua_sess, uchan, app, | |
4199 | LTTNG_UST_CHAN_PER_CPU, usess, NULL); | |
4200 | } | |
d0b96690 | 4201 | pthread_mutex_unlock(&ua_sess->lock); |
3d8ca23b | 4202 | if (ret < 0) { |
3d8ca23b DG |
4203 | /* Cleanup the created session if it's the case. */ |
4204 | if (created) { | |
d0b96690 | 4205 | destroy_app_session(app, ua_sess); |
3d8ca23b | 4206 | } |
a7169585 MD |
4207 | switch (ret) { |
4208 | case -ENOTCONN: | |
4209 | /* | |
4210 | * The application's socket is not valid. Either a bad socket | |
4211 | * or a timeout on it. We can't inform the caller that for a | |
4212 | * specific app, the session failed so lets continue here. | |
4213 | */ | |
4214 | ret = 0; /* Not an error. */ | |
4215 | continue; | |
4216 | case -ENOMEM: | |
4217 | default: | |
4218 | goto error_rcu_unlock; | |
4219 | } | |
48842b30 | 4220 | } |
48842b30 | 4221 | } |
5b4a0ec0 | 4222 | |
95e047ff | 4223 | error_rcu_unlock: |
48842b30 | 4224 | rcu_read_unlock(); |
3c14c33f | 4225 | return ret; |
48842b30 DG |
4226 | } |
4227 | ||
5b4a0ec0 | 4228 | /* |
edb67388 | 4229 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 4230 | */ |
35a9059d | 4231 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
4232 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4233 | { | |
4234 | int ret = 0; | |
bec39940 | 4235 | struct lttng_ht_iter iter, uiter; |
18eace3b | 4236 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
4237 | struct ust_app *app; |
4238 | struct ust_app_session *ua_sess; | |
4239 | struct ust_app_channel *ua_chan; | |
4240 | struct ust_app_event *ua_event; | |
48842b30 | 4241 | |
d9bf3ca4 | 4242 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 4243 | uevent->attr.name, usess->id); |
48842b30 | 4244 | |
edb67388 DG |
4245 | /* |
4246 | * NOTE: At this point, this function is called only if the session and | |
4247 | * channel passed are already created for all apps. and enabled on the | |
4248 | * tracer also. | |
4249 | */ | |
4250 | ||
48842b30 | 4251 | rcu_read_lock(); |
421cb601 DG |
4252 | |
4253 | /* For all registered applications */ | |
852d0037 | 4254 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4255 | if (!app->compatible) { |
4256 | /* | |
4257 | * TODO: In time, we should notice the caller of this error by | |
4258 | * telling him that this is a version error. | |
4259 | */ | |
4260 | continue; | |
4261 | } | |
edb67388 | 4262 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4263 | if (!ua_sess) { |
4264 | /* The application has problem or is probably dead. */ | |
4265 | continue; | |
4266 | } | |
ba767faf | 4267 | |
d0b96690 DG |
4268 | pthread_mutex_lock(&ua_sess->lock); |
4269 | ||
b161602a MD |
4270 | if (ua_sess->deleted) { |
4271 | pthread_mutex_unlock(&ua_sess->lock); | |
4272 | continue; | |
4273 | } | |
4274 | ||
edb67388 | 4275 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4276 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4277 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
a7169585 MD |
4278 | /* |
4279 | * It is possible that the channel cannot be found is | |
4280 | * the channel/event creation occurs concurrently with | |
4281 | * an application exit. | |
4282 | */ | |
4283 | if (!ua_chan_node) { | |
4284 | pthread_mutex_unlock(&ua_sess->lock); | |
4285 | continue; | |
4286 | } | |
edb67388 DG |
4287 | |
4288 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4289 | ||
18eace3b DG |
4290 | /* Get event node */ |
4291 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
39c5a3a7 | 4292 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 4293 | if (ua_event == NULL) { |
7f79d3a1 | 4294 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 4295 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 4296 | goto next_app; |
35a9059d | 4297 | } |
35a9059d DG |
4298 | |
4299 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
4300 | if (ret < 0) { | |
d0b96690 | 4301 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 4302 | goto error; |
48842b30 | 4303 | } |
d0b96690 DG |
4304 | next_app: |
4305 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
4306 | } |
4307 | ||
7f79d3a1 | 4308 | error: |
edb67388 | 4309 | rcu_read_unlock(); |
edb67388 DG |
4310 | return ret; |
4311 | } | |
4312 | ||
4313 | /* | |
4314 | * For a specific existing UST session and UST channel, creates the event for | |
4315 | * all registered apps. | |
4316 | */ | |
35a9059d | 4317 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
4318 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4319 | { | |
4320 | int ret = 0; | |
bec39940 DG |
4321 | struct lttng_ht_iter iter, uiter; |
4322 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
4323 | struct ust_app *app; |
4324 | struct ust_app_session *ua_sess; | |
4325 | struct ust_app_channel *ua_chan; | |
4326 | ||
d9bf3ca4 | 4327 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 4328 | uevent->attr.name, usess->id); |
edb67388 | 4329 | |
edb67388 DG |
4330 | rcu_read_lock(); |
4331 | ||
4332 | /* For all registered applications */ | |
852d0037 | 4333 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4334 | if (!app->compatible) { |
4335 | /* | |
4336 | * TODO: In time, we should notice the caller of this error by | |
4337 | * telling him that this is a version error. | |
4338 | */ | |
4339 | continue; | |
4340 | } | |
edb67388 | 4341 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4342 | if (!ua_sess) { |
4343 | /* The application has problem or is probably dead. */ | |
4344 | continue; | |
4345 | } | |
48842b30 | 4346 | |
d0b96690 | 4347 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
4348 | |
4349 | if (ua_sess->deleted) { | |
4350 | pthread_mutex_unlock(&ua_sess->lock); | |
4351 | continue; | |
4352 | } | |
4353 | ||
48842b30 | 4354 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4355 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4356 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
4357 | /* If the channel is not found, there is a code flow error */ |
4358 | assert(ua_chan_node); | |
4359 | ||
48842b30 DG |
4360 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
4361 | ||
edb67388 | 4362 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 4363 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 4364 | if (ret < 0) { |
49c336c1 | 4365 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
4366 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
4367 | break; | |
4368 | } | |
4369 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 4370 | uevent->attr.name, app->pid); |
5b4a0ec0 | 4371 | continue; |
48842b30 | 4372 | } |
48842b30 | 4373 | } |
5b4a0ec0 | 4374 | |
48842b30 DG |
4375 | rcu_read_unlock(); |
4376 | ||
4377 | return ret; | |
4378 | } | |
4379 | ||
5b4a0ec0 DG |
4380 | /* |
4381 | * Start tracing for a specific UST session and app. | |
fad1ed2f JR |
4382 | * |
4383 | * Called with UST app session lock held. | |
4384 | * | |
5b4a0ec0 | 4385 | */ |
b34cbebf | 4386 | static |
421cb601 | 4387 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
4388 | { |
4389 | int ret = 0; | |
48842b30 | 4390 | struct ust_app_session *ua_sess; |
48842b30 | 4391 | |
852d0037 | 4392 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 4393 | |
509cbaf8 MD |
4394 | rcu_read_lock(); |
4395 | ||
e0c7ec2b DG |
4396 | if (!app->compatible) { |
4397 | goto end; | |
4398 | } | |
4399 | ||
421cb601 DG |
4400 | ua_sess = lookup_session_by_app(usess, app); |
4401 | if (ua_sess == NULL) { | |
d42f20df DG |
4402 | /* The session is in teardown process. Ignore and continue. */ |
4403 | goto end; | |
421cb601 | 4404 | } |
48842b30 | 4405 | |
d0b96690 DG |
4406 | pthread_mutex_lock(&ua_sess->lock); |
4407 | ||
b161602a MD |
4408 | if (ua_sess->deleted) { |
4409 | pthread_mutex_unlock(&ua_sess->lock); | |
4410 | goto end; | |
4411 | } | |
4412 | ||
aea829b3 DG |
4413 | /* Upon restart, we skip the setup, already done */ |
4414 | if (ua_sess->started) { | |
8be98f9a | 4415 | goto skip_setup; |
aea829b3 | 4416 | } |
8be98f9a | 4417 | |
a4b92340 DG |
4418 | /* Create directories if consumer is LOCAL and has a path defined. */ |
4419 | if (usess->consumer->type == CONSUMER_DST_LOCAL && | |
4420 | strlen(usess->consumer->dst.trace_path) > 0) { | |
4421 | ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path, | |
7972aab2 | 4422 | S_IRWXU | S_IRWXG, ua_sess->euid, ua_sess->egid); |
a4b92340 | 4423 | if (ret < 0) { |
df5b86c8 | 4424 | if (errno != EEXIST) { |
a4b92340 | 4425 | ERR("Trace directory creation error"); |
d0b96690 | 4426 | goto error_unlock; |
421cb601 | 4427 | } |
173af62f | 4428 | } |
7753dea8 | 4429 | } |
aea829b3 | 4430 | |
d65d2de8 DG |
4431 | /* |
4432 | * Create the metadata for the application. This returns gracefully if a | |
4433 | * metadata was already set for the session. | |
4434 | */ | |
ad7a9107 | 4435 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer); |
421cb601 | 4436 | if (ret < 0) { |
d0b96690 | 4437 | goto error_unlock; |
421cb601 | 4438 | } |
48842b30 | 4439 | |
840cb59c | 4440 | health_code_update(); |
86acf0da | 4441 | |
8be98f9a | 4442 | skip_setup: |
421cb601 | 4443 | /* This start the UST tracing */ |
fb45065e | 4444 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4445 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
fb45065e | 4446 | pthread_mutex_unlock(&app->sock_lock); |
421cb601 | 4447 | if (ret < 0) { |
ffe60014 DG |
4448 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4449 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
4450 | app->pid, ret); | |
4451 | } else { | |
4452 | DBG("UST app start session failed. Application is dead."); | |
3757b385 DG |
4453 | /* |
4454 | * This is normal behavior, an application can die during the | |
4455 | * creation process. Don't report an error so the execution can | |
4456 | * continue normally. | |
4457 | */ | |
4458 | pthread_mutex_unlock(&ua_sess->lock); | |
4459 | goto end; | |
ffe60014 | 4460 | } |
d0b96690 | 4461 | goto error_unlock; |
421cb601 | 4462 | } |
5b4a0ec0 | 4463 | |
55c3953d DG |
4464 | /* Indicate that the session has been started once */ |
4465 | ua_sess->started = 1; | |
4466 | ||
d0b96690 DG |
4467 | pthread_mutex_unlock(&ua_sess->lock); |
4468 | ||
840cb59c | 4469 | health_code_update(); |
86acf0da | 4470 | |
421cb601 | 4471 | /* Quiescent wait after starting trace */ |
fb45065e | 4472 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4473 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4474 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4475 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4476 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4477 | app->pid, ret); | |
4478 | } | |
48842b30 | 4479 | |
e0c7ec2b DG |
4480 | end: |
4481 | rcu_read_unlock(); | |
840cb59c | 4482 | health_code_update(); |
421cb601 | 4483 | return 0; |
48842b30 | 4484 | |
d0b96690 DG |
4485 | error_unlock: |
4486 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 4487 | rcu_read_unlock(); |
840cb59c | 4488 | health_code_update(); |
421cb601 DG |
4489 | return -1; |
4490 | } | |
48842b30 | 4491 | |
8be98f9a MD |
4492 | /* |
4493 | * Stop tracing for a specific UST session and app. | |
4494 | */ | |
b34cbebf | 4495 | static |
8be98f9a MD |
4496 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
4497 | { | |
4498 | int ret = 0; | |
4499 | struct ust_app_session *ua_sess; | |
7972aab2 | 4500 | struct ust_registry_session *registry; |
8be98f9a | 4501 | |
852d0037 | 4502 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
4503 | |
4504 | rcu_read_lock(); | |
4505 | ||
e0c7ec2b | 4506 | if (!app->compatible) { |
d88aee68 | 4507 | goto end_no_session; |
e0c7ec2b DG |
4508 | } |
4509 | ||
8be98f9a MD |
4510 | ua_sess = lookup_session_by_app(usess, app); |
4511 | if (ua_sess == NULL) { | |
d88aee68 | 4512 | goto end_no_session; |
8be98f9a MD |
4513 | } |
4514 | ||
d88aee68 DG |
4515 | pthread_mutex_lock(&ua_sess->lock); |
4516 | ||
b161602a MD |
4517 | if (ua_sess->deleted) { |
4518 | pthread_mutex_unlock(&ua_sess->lock); | |
4519 | goto end_no_session; | |
4520 | } | |
4521 | ||
9bc07046 DG |
4522 | /* |
4523 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
4524 | * that was never started. It's possible since we can have a fail start |
4525 | * from either the application manager thread or the command thread. Simply | |
4526 | * indicate that this is a stop error. | |
9bc07046 | 4527 | */ |
f9dfc3d9 | 4528 | if (!ua_sess->started) { |
c45536e1 DG |
4529 | goto error_rcu_unlock; |
4530 | } | |
7db205b5 | 4531 | |
840cb59c | 4532 | health_code_update(); |
86acf0da | 4533 | |
9d6c7d3f | 4534 | /* This inhibits UST tracing */ |
fb45065e | 4535 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4536 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
fb45065e | 4537 | pthread_mutex_unlock(&app->sock_lock); |
9d6c7d3f | 4538 | if (ret < 0) { |
ffe60014 DG |
4539 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4540 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
4541 | app->pid, ret); | |
4542 | } else { | |
4543 | DBG("UST app stop session failed. Application is dead."); | |
3757b385 DG |
4544 | /* |
4545 | * This is normal behavior, an application can die during the | |
4546 | * creation process. Don't report an error so the execution can | |
4547 | * continue normally. | |
4548 | */ | |
4549 | goto end_unlock; | |
ffe60014 | 4550 | } |
9d6c7d3f DG |
4551 | goto error_rcu_unlock; |
4552 | } | |
4553 | ||
840cb59c | 4554 | health_code_update(); |
86acf0da | 4555 | |
9d6c7d3f | 4556 | /* Quiescent wait after stopping trace */ |
fb45065e | 4557 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4558 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4559 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4560 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4561 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4562 | app->pid, ret); | |
4563 | } | |
9d6c7d3f | 4564 | |
840cb59c | 4565 | health_code_update(); |
86acf0da | 4566 | |
b34cbebf | 4567 | registry = get_session_registry(ua_sess); |
fad1ed2f JR |
4568 | |
4569 | /* The UST app session is held registry shall not be null. */ | |
b34cbebf | 4570 | assert(registry); |
1b532a60 | 4571 | |
ce34fcd0 MD |
4572 | /* Push metadata for application before freeing the application. */ |
4573 | (void) push_metadata(registry, ua_sess->consumer); | |
b34cbebf | 4574 | |
3757b385 | 4575 | end_unlock: |
b34cbebf MD |
4576 | pthread_mutex_unlock(&ua_sess->lock); |
4577 | end_no_session: | |
4578 | rcu_read_unlock(); | |
4579 | health_code_update(); | |
4580 | return 0; | |
4581 | ||
4582 | error_rcu_unlock: | |
4583 | pthread_mutex_unlock(&ua_sess->lock); | |
4584 | rcu_read_unlock(); | |
4585 | health_code_update(); | |
4586 | return -1; | |
4587 | } | |
4588 | ||
b34cbebf | 4589 | static |
c4b88406 MD |
4590 | int ust_app_flush_app_session(struct ust_app *app, |
4591 | struct ust_app_session *ua_sess) | |
b34cbebf | 4592 | { |
c4b88406 | 4593 | int ret, retval = 0; |
b34cbebf | 4594 | struct lttng_ht_iter iter; |
b34cbebf | 4595 | struct ust_app_channel *ua_chan; |
c4b88406 | 4596 | struct consumer_socket *socket; |
b34cbebf | 4597 | |
c4b88406 | 4598 | DBG("Flushing app session buffers for ust app pid %d", app->pid); |
b34cbebf MD |
4599 | |
4600 | rcu_read_lock(); | |
4601 | ||
4602 | if (!app->compatible) { | |
c4b88406 | 4603 | goto end_not_compatible; |
b34cbebf MD |
4604 | } |
4605 | ||
4606 | pthread_mutex_lock(&ua_sess->lock); | |
4607 | ||
b161602a MD |
4608 | if (ua_sess->deleted) { |
4609 | goto end_deleted; | |
4610 | } | |
4611 | ||
b34cbebf MD |
4612 | health_code_update(); |
4613 | ||
9d6c7d3f | 4614 | /* Flushing buffers */ |
c4b88406 MD |
4615 | socket = consumer_find_socket_by_bitness(app->bits_per_long, |
4616 | ua_sess->consumer); | |
ce34fcd0 MD |
4617 | |
4618 | /* Flush buffers and push metadata. */ | |
4619 | switch (ua_sess->buffer_type) { | |
4620 | case LTTNG_BUFFER_PER_PID: | |
4621 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, | |
4622 | node.node) { | |
4623 | health_code_update(); | |
ce34fcd0 MD |
4624 | ret = consumer_flush_channel(socket, ua_chan->key); |
4625 | if (ret) { | |
4626 | ERR("Error flushing consumer channel"); | |
4627 | retval = -1; | |
4628 | continue; | |
4629 | } | |
8be98f9a | 4630 | } |
ce34fcd0 MD |
4631 | break; |
4632 | case LTTNG_BUFFER_PER_UID: | |
4633 | default: | |
4634 | assert(0); | |
4635 | break; | |
8be98f9a | 4636 | } |
8be98f9a | 4637 | |
840cb59c | 4638 | health_code_update(); |
86acf0da | 4639 | |
b161602a | 4640 | end_deleted: |
d88aee68 | 4641 | pthread_mutex_unlock(&ua_sess->lock); |
ce34fcd0 | 4642 | |
c4b88406 MD |
4643 | end_not_compatible: |
4644 | rcu_read_unlock(); | |
4645 | health_code_update(); | |
4646 | return retval; | |
4647 | } | |
4648 | ||
4649 | /* | |
ce34fcd0 MD |
4650 | * Flush buffers for all applications for a specific UST session. |
4651 | * Called with UST session lock held. | |
c4b88406 MD |
4652 | */ |
4653 | static | |
ce34fcd0 | 4654 | int ust_app_flush_session(struct ltt_ust_session *usess) |
c4b88406 MD |
4655 | |
4656 | { | |
99b1411c | 4657 | int ret = 0; |
c4b88406 | 4658 | |
ce34fcd0 | 4659 | DBG("Flushing session buffers for all ust apps"); |
c4b88406 MD |
4660 | |
4661 | rcu_read_lock(); | |
4662 | ||
ce34fcd0 MD |
4663 | /* Flush buffers and push metadata. */ |
4664 | switch (usess->buffer_type) { | |
4665 | case LTTNG_BUFFER_PER_UID: | |
4666 | { | |
4667 | struct buffer_reg_uid *reg; | |
4668 | struct lttng_ht_iter iter; | |
4669 | ||
4670 | /* Flush all per UID buffers associated to that session. */ | |
4671 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
4672 | struct ust_registry_session *ust_session_reg; | |
4673 | struct buffer_reg_channel *reg_chan; | |
4674 | struct consumer_socket *socket; | |
4675 | ||
4676 | /* Get consumer socket to use to push the metadata.*/ | |
4677 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
4678 | usess->consumer); | |
4679 | if (!socket) { | |
4680 | /* Ignore request if no consumer is found for the session. */ | |
4681 | continue; | |
4682 | } | |
4683 | ||
4684 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
4685 | reg_chan, node.node) { | |
4686 | /* | |
4687 | * The following call will print error values so the return | |
4688 | * code is of little importance because whatever happens, we | |
4689 | * have to try them all. | |
4690 | */ | |
4691 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
4692 | } | |
4693 | ||
4694 | ust_session_reg = reg->registry->reg.ust; | |
4695 | /* Push metadata. */ | |
4696 | (void) push_metadata(ust_session_reg, usess->consumer); | |
4697 | } | |
ce34fcd0 MD |
4698 | break; |
4699 | } | |
4700 | case LTTNG_BUFFER_PER_PID: | |
4701 | { | |
4702 | struct ust_app_session *ua_sess; | |
4703 | struct lttng_ht_iter iter; | |
4704 | struct ust_app *app; | |
4705 | ||
4706 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4707 | ua_sess = lookup_session_by_app(usess, app); | |
4708 | if (ua_sess == NULL) { | |
4709 | continue; | |
4710 | } | |
4711 | (void) ust_app_flush_app_session(app, ua_sess); | |
4712 | } | |
4713 | break; | |
4714 | } | |
4715 | default: | |
99b1411c | 4716 | ret = -1; |
ce34fcd0 MD |
4717 | assert(0); |
4718 | break; | |
c4b88406 | 4719 | } |
c4b88406 | 4720 | |
7db205b5 | 4721 | rcu_read_unlock(); |
840cb59c | 4722 | health_code_update(); |
c4b88406 | 4723 | return ret; |
8be98f9a MD |
4724 | } |
4725 | ||
0dd01979 MD |
4726 | static |
4727 | int ust_app_clear_quiescent_app_session(struct ust_app *app, | |
4728 | struct ust_app_session *ua_sess) | |
4729 | { | |
4730 | int ret = 0; | |
4731 | struct lttng_ht_iter iter; | |
4732 | struct ust_app_channel *ua_chan; | |
4733 | struct consumer_socket *socket; | |
4734 | ||
4735 | DBG("Clearing stream quiescent state for ust app pid %d", app->pid); | |
4736 | ||
4737 | rcu_read_lock(); | |
4738 | ||
4739 | if (!app->compatible) { | |
4740 | goto end_not_compatible; | |
4741 | } | |
4742 | ||
4743 | pthread_mutex_lock(&ua_sess->lock); | |
4744 | ||
4745 | if (ua_sess->deleted) { | |
4746 | goto end_unlock; | |
4747 | } | |
4748 | ||
4749 | health_code_update(); | |
4750 | ||
4751 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
4752 | ua_sess->consumer); | |
4753 | if (!socket) { | |
4754 | ERR("Failed to find consumer (%" PRIu32 ") socket", | |
4755 | app->bits_per_long); | |
4756 | ret = -1; | |
4757 | goto end_unlock; | |
4758 | } | |
4759 | ||
4760 | /* Clear quiescent state. */ | |
4761 | switch (ua_sess->buffer_type) { | |
4762 | case LTTNG_BUFFER_PER_PID: | |
4763 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, | |
4764 | ua_chan, node.node) { | |
4765 | health_code_update(); | |
4766 | ret = consumer_clear_quiescent_channel(socket, | |
4767 | ua_chan->key); | |
4768 | if (ret) { | |
4769 | ERR("Error clearing quiescent state for consumer channel"); | |
4770 | ret = -1; | |
4771 | continue; | |
4772 | } | |
4773 | } | |
4774 | break; | |
4775 | case LTTNG_BUFFER_PER_UID: | |
4776 | default: | |
4777 | assert(0); | |
4778 | ret = -1; | |
4779 | break; | |
4780 | } | |
4781 | ||
4782 | health_code_update(); | |
4783 | ||
4784 | end_unlock: | |
4785 | pthread_mutex_unlock(&ua_sess->lock); | |
4786 | ||
4787 | end_not_compatible: | |
4788 | rcu_read_unlock(); | |
4789 | health_code_update(); | |
4790 | return ret; | |
4791 | } | |
4792 | ||
4793 | /* | |
4794 | * Clear quiescent state in each stream for all applications for a | |
4795 | * specific UST session. | |
4796 | * Called with UST session lock held. | |
4797 | */ | |
4798 | static | |
4799 | int ust_app_clear_quiescent_session(struct ltt_ust_session *usess) | |
4800 | ||
4801 | { | |
4802 | int ret = 0; | |
4803 | ||
4804 | DBG("Clearing stream quiescent state for all ust apps"); | |
4805 | ||
4806 | rcu_read_lock(); | |
4807 | ||
4808 | switch (usess->buffer_type) { | |
4809 | case LTTNG_BUFFER_PER_UID: | |
4810 | { | |
4811 | struct lttng_ht_iter iter; | |
4812 | struct buffer_reg_uid *reg; | |
4813 | ||
4814 | /* | |
4815 | * Clear quiescent for all per UID buffers associated to | |
4816 | * that session. | |
4817 | */ | |
4818 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
4819 | struct consumer_socket *socket; | |
4820 | struct buffer_reg_channel *reg_chan; | |
4821 | ||
4822 | /* Get associated consumer socket.*/ | |
4823 | socket = consumer_find_socket_by_bitness( | |
4824 | reg->bits_per_long, usess->consumer); | |
4825 | if (!socket) { | |
4826 | /* | |
4827 | * Ignore request if no consumer is found for | |
4828 | * the session. | |
4829 | */ | |
4830 | continue; | |
4831 | } | |
4832 | ||
4833 | cds_lfht_for_each_entry(reg->registry->channels->ht, | |
4834 | &iter.iter, reg_chan, node.node) { | |
4835 | /* | |
4836 | * The following call will print error values so | |
4837 | * the return code is of little importance | |
4838 | * because whatever happens, we have to try them | |
4839 | * all. | |
4840 | */ | |
4841 | (void) consumer_clear_quiescent_channel(socket, | |
4842 | reg_chan->consumer_key); | |
4843 | } | |
4844 | } | |
4845 | break; | |
4846 | } | |
4847 | case LTTNG_BUFFER_PER_PID: | |
4848 | { | |
4849 | struct ust_app_session *ua_sess; | |
4850 | struct lttng_ht_iter iter; | |
4851 | struct ust_app *app; | |
4852 | ||
4853 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, | |
4854 | pid_n.node) { | |
4855 | ua_sess = lookup_session_by_app(usess, app); | |
4856 | if (ua_sess == NULL) { | |
4857 | continue; | |
4858 | } | |
4859 | (void) ust_app_clear_quiescent_app_session(app, | |
4860 | ua_sess); | |
4861 | } | |
4862 | break; | |
4863 | } | |
4864 | default: | |
4865 | ret = -1; | |
4866 | assert(0); | |
4867 | break; | |
4868 | } | |
4869 | ||
4870 | rcu_read_unlock(); | |
4871 | health_code_update(); | |
4872 | return ret; | |
4873 | } | |
4874 | ||
84cd17c6 MD |
4875 | /* |
4876 | * Destroy a specific UST session in apps. | |
4877 | */ | |
3353de95 | 4878 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 4879 | { |
ffe60014 | 4880 | int ret; |
84cd17c6 | 4881 | struct ust_app_session *ua_sess; |
bec39940 | 4882 | struct lttng_ht_iter iter; |
d9bf3ca4 | 4883 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 4884 | |
852d0037 | 4885 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
4886 | |
4887 | rcu_read_lock(); | |
4888 | ||
e0c7ec2b DG |
4889 | if (!app->compatible) { |
4890 | goto end; | |
4891 | } | |
4892 | ||
84cd17c6 | 4893 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 4894 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 4895 | if (node == NULL) { |
d42f20df DG |
4896 | /* Session is being or is deleted. */ |
4897 | goto end; | |
84cd17c6 MD |
4898 | } |
4899 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 4900 | |
840cb59c | 4901 | health_code_update(); |
d0b96690 | 4902 | destroy_app_session(app, ua_sess); |
84cd17c6 | 4903 | |
840cb59c | 4904 | health_code_update(); |
7db205b5 | 4905 | |
84cd17c6 | 4906 | /* Quiescent wait after stopping trace */ |
fb45065e | 4907 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4908 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4909 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4910 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4911 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4912 | app->pid, ret); | |
4913 | } | |
e0c7ec2b DG |
4914 | end: |
4915 | rcu_read_unlock(); | |
840cb59c | 4916 | health_code_update(); |
84cd17c6 | 4917 | return 0; |
84cd17c6 MD |
4918 | } |
4919 | ||
5b4a0ec0 DG |
4920 | /* |
4921 | * Start tracing for the UST session. | |
4922 | */ | |
421cb601 DG |
4923 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
4924 | { | |
4925 | int ret = 0; | |
bec39940 | 4926 | struct lttng_ht_iter iter; |
421cb601 | 4927 | struct ust_app *app; |
48842b30 | 4928 | |
421cb601 DG |
4929 | DBG("Starting all UST traces"); |
4930 | ||
4931 | rcu_read_lock(); | |
421cb601 | 4932 | |
0dd01979 MD |
4933 | /* |
4934 | * In a start-stop-start use-case, we need to clear the quiescent state | |
4935 | * of each channel set by the prior stop command, thus ensuring that a | |
4936 | * following stop or destroy is sure to grab a timestamp_end near those | |
4937 | * operations, even if the packet is empty. | |
4938 | */ | |
4939 | (void) ust_app_clear_quiescent_session(usess); | |
4940 | ||
852d0037 | 4941 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
421cb601 | 4942 | ret = ust_app_start_trace(usess, app); |
48842b30 | 4943 | if (ret < 0) { |
5b4a0ec0 DG |
4944 | /* Continue to next apps even on error */ |
4945 | continue; | |
48842b30 | 4946 | } |
48842b30 | 4947 | } |
5b4a0ec0 | 4948 | |
48842b30 DG |
4949 | rcu_read_unlock(); |
4950 | ||
4951 | return 0; | |
4952 | } | |
487cf67c | 4953 | |
8be98f9a MD |
4954 | /* |
4955 | * Start tracing for the UST session. | |
ce34fcd0 | 4956 | * Called with UST session lock held. |
8be98f9a MD |
4957 | */ |
4958 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
4959 | { | |
4960 | int ret = 0; | |
bec39940 | 4961 | struct lttng_ht_iter iter; |
8be98f9a MD |
4962 | struct ust_app *app; |
4963 | ||
4964 | DBG("Stopping all UST traces"); | |
4965 | ||
4966 | rcu_read_lock(); | |
4967 | ||
b34cbebf MD |
4968 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4969 | ret = ust_app_stop_trace(usess, app); | |
4970 | if (ret < 0) { | |
4971 | /* Continue to next apps even on error */ | |
4972 | continue; | |
4973 | } | |
4974 | } | |
4975 | ||
ce34fcd0 | 4976 | (void) ust_app_flush_session(usess); |
8be98f9a MD |
4977 | |
4978 | rcu_read_unlock(); | |
4979 | ||
4980 | return 0; | |
4981 | } | |
4982 | ||
84cd17c6 MD |
4983 | /* |
4984 | * Destroy app UST session. | |
4985 | */ | |
4986 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
4987 | { | |
4988 | int ret = 0; | |
bec39940 | 4989 | struct lttng_ht_iter iter; |
84cd17c6 MD |
4990 | struct ust_app *app; |
4991 | ||
4992 | DBG("Destroy all UST traces"); | |
4993 | ||
4994 | rcu_read_lock(); | |
4995 | ||
852d0037 | 4996 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 4997 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
4998 | if (ret < 0) { |
4999 | /* Continue to next apps even on error */ | |
5000 | continue; | |
5001 | } | |
5002 | } | |
5003 | ||
5004 | rcu_read_unlock(); | |
5005 | ||
5006 | return 0; | |
5007 | } | |
5008 | ||
a9ad0c8f MD |
5009 | static |
5010 | void ust_app_global_create(struct ltt_ust_session *usess, struct ust_app *app) | |
487cf67c | 5011 | { |
55c54cce | 5012 | int ret = 0; |
31746f93 | 5013 | struct lttng_ht_iter iter, uiter; |
3d8ca23b | 5014 | struct ust_app_session *ua_sess = NULL; |
487cf67c DG |
5015 | struct ust_app_channel *ua_chan; |
5016 | struct ust_app_event *ua_event; | |
727d5404 | 5017 | struct ust_app_ctx *ua_ctx; |
a9ad0c8f | 5018 | int is_created = 0; |
1f3580c7 | 5019 | |
a9ad0c8f | 5020 | ret = create_ust_app_session(usess, app, &ua_sess, &is_created); |
3d8ca23b DG |
5021 | if (ret < 0) { |
5022 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
5023 | goto error; |
5024 | } | |
a9ad0c8f MD |
5025 | if (!is_created) { |
5026 | /* App session already created. */ | |
5027 | goto end; | |
5028 | } | |
3d8ca23b | 5029 | assert(ua_sess); |
487cf67c | 5030 | |
d0b96690 DG |
5031 | pthread_mutex_lock(&ua_sess->lock); |
5032 | ||
b161602a MD |
5033 | if (ua_sess->deleted) { |
5034 | pthread_mutex_unlock(&ua_sess->lock); | |
5035 | goto end; | |
5036 | } | |
5037 | ||
284d8f55 | 5038 | /* |
d0b96690 | 5039 | * We can iterate safely here over all UST app session since the create ust |
284d8f55 DG |
5040 | * app session above made a shadow copy of the UST global domain from the |
5041 | * ltt ust session. | |
5042 | */ | |
bec39940 DG |
5043 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
5044 | node.node) { | |
ad7a9107 | 5045 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
a7169585 | 5046 | if (ret < 0 && ret != -ENOTCONN) { |
ad7a9107 | 5047 | /* |
a7169585 MD |
5048 | * Stop everything. On error, the application |
5049 | * failed, no more file descriptor are available | |
5050 | * or ENOMEM so stopping here is the only thing | |
5051 | * we can do for now. The only exception is | |
5052 | * -ENOTCONN, which indicates that the application | |
5053 | * has exit. | |
ad7a9107 DG |
5054 | */ |
5055 | goto error_unlock; | |
487cf67c DG |
5056 | } |
5057 | ||
31746f93 DG |
5058 | /* |
5059 | * Add context using the list so they are enabled in the same order the | |
5060 | * user added them. | |
5061 | */ | |
5062 | cds_list_for_each_entry(ua_ctx, &ua_chan->ctx_list, list) { | |
727d5404 DG |
5063 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); |
5064 | if (ret < 0) { | |
d0b96690 | 5065 | goto error_unlock; |
727d5404 DG |
5066 | } |
5067 | } | |
5068 | ||
5069 | ||
284d8f55 | 5070 | /* For each events */ |
bec39940 DG |
5071 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
5072 | node.node) { | |
284d8f55 DG |
5073 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
5074 | if (ret < 0) { | |
d0b96690 | 5075 | goto error_unlock; |
487cf67c | 5076 | } |
36dc12cc | 5077 | } |
487cf67c DG |
5078 | } |
5079 | ||
d0b96690 DG |
5080 | pthread_mutex_unlock(&ua_sess->lock); |
5081 | ||
14fb1ebe | 5082 | if (usess->active) { |
421cb601 | 5083 | ret = ust_app_start_trace(usess, app); |
36dc12cc | 5084 | if (ret < 0) { |
36dc12cc DG |
5085 | goto error; |
5086 | } | |
5087 | ||
852d0037 | 5088 | DBG2("UST trace started for app pid %d", app->pid); |
36dc12cc | 5089 | } |
a9ad0c8f | 5090 | end: |
ffe60014 | 5091 | /* Everything went well at this point. */ |
ffe60014 DG |
5092 | return; |
5093 | ||
d0b96690 DG |
5094 | error_unlock: |
5095 | pthread_mutex_unlock(&ua_sess->lock); | |
487cf67c | 5096 | error: |
ffe60014 | 5097 | if (ua_sess) { |
d0b96690 | 5098 | destroy_app_session(app, ua_sess); |
ffe60014 | 5099 | } |
487cf67c DG |
5100 | return; |
5101 | } | |
55cc08a6 | 5102 | |
a9ad0c8f MD |
5103 | static |
5104 | void ust_app_global_destroy(struct ltt_ust_session *usess, struct ust_app *app) | |
5105 | { | |
5106 | struct ust_app_session *ua_sess; | |
5107 | ||
5108 | ua_sess = lookup_session_by_app(usess, app); | |
5109 | if (ua_sess == NULL) { | |
5110 | return; | |
5111 | } | |
5112 | destroy_app_session(app, ua_sess); | |
5113 | } | |
5114 | ||
5115 | /* | |
5116 | * Add channels/events from UST global domain to registered apps at sock. | |
5117 | * | |
5118 | * Called with session lock held. | |
5119 | * Called with RCU read-side lock held. | |
5120 | */ | |
5121 | void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app) | |
5122 | { | |
5123 | assert(usess); | |
5124 | ||
5125 | DBG2("UST app global update for app sock %d for session id %" PRIu64, | |
5126 | app->sock, usess->id); | |
5127 | ||
5128 | if (!app->compatible) { | |
5129 | return; | |
5130 | } | |
5131 | ||
5132 | if (trace_ust_pid_tracker_lookup(usess, app->pid)) { | |
5133 | ust_app_global_create(usess, app); | |
5134 | } else { | |
5135 | ust_app_global_destroy(usess, app); | |
5136 | } | |
5137 | } | |
5138 | ||
5139 | /* | |
5140 | * Called with session lock held. | |
5141 | */ | |
5142 | void ust_app_global_update_all(struct ltt_ust_session *usess) | |
5143 | { | |
5144 | struct lttng_ht_iter iter; | |
5145 | struct ust_app *app; | |
5146 | ||
5147 | rcu_read_lock(); | |
5148 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5149 | ust_app_global_update(usess, app); | |
5150 | } | |
5151 | rcu_read_unlock(); | |
5152 | } | |
5153 | ||
55cc08a6 DG |
5154 | /* |
5155 | * Add context to a specific channel for global UST domain. | |
5156 | */ | |
5157 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
5158 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
5159 | { | |
5160 | int ret = 0; | |
bec39940 DG |
5161 | struct lttng_ht_node_str *ua_chan_node; |
5162 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
5163 | struct ust_app_channel *ua_chan = NULL; |
5164 | struct ust_app_session *ua_sess; | |
5165 | struct ust_app *app; | |
5166 | ||
5167 | rcu_read_lock(); | |
5168 | ||
852d0037 | 5169 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
5170 | if (!app->compatible) { |
5171 | /* | |
5172 | * TODO: In time, we should notice the caller of this error by | |
5173 | * telling him that this is a version error. | |
5174 | */ | |
5175 | continue; | |
5176 | } | |
55cc08a6 DG |
5177 | ua_sess = lookup_session_by_app(usess, app); |
5178 | if (ua_sess == NULL) { | |
5179 | continue; | |
5180 | } | |
5181 | ||
d0b96690 | 5182 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
5183 | |
5184 | if (ua_sess->deleted) { | |
5185 | pthread_mutex_unlock(&ua_sess->lock); | |
5186 | continue; | |
5187 | } | |
5188 | ||
55cc08a6 | 5189 | /* Lookup channel in the ust app session */ |
bec39940 DG |
5190 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
5191 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 5192 | if (ua_chan_node == NULL) { |
d0b96690 | 5193 | goto next_app; |
55cc08a6 DG |
5194 | } |
5195 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
5196 | node); | |
55cc08a6 DG |
5197 | ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app); |
5198 | if (ret < 0) { | |
d0b96690 | 5199 | goto next_app; |
55cc08a6 | 5200 | } |
d0b96690 DG |
5201 | next_app: |
5202 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
5203 | } |
5204 | ||
55cc08a6 DG |
5205 | rcu_read_unlock(); |
5206 | return ret; | |
5207 | } | |
5208 | ||
76d45b40 DG |
5209 | /* |
5210 | * Enable event for a channel from a UST session for a specific PID. | |
5211 | */ | |
5212 | int ust_app_enable_event_pid(struct ltt_ust_session *usess, | |
5213 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
5214 | { | |
5215 | int ret = 0; | |
bec39940 | 5216 | struct lttng_ht_iter iter; |
18eace3b | 5217 | struct lttng_ht_node_str *ua_chan_node; |
76d45b40 DG |
5218 | struct ust_app *app; |
5219 | struct ust_app_session *ua_sess; | |
5220 | struct ust_app_channel *ua_chan; | |
5221 | struct ust_app_event *ua_event; | |
5222 | ||
5223 | DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid); | |
5224 | ||
5225 | rcu_read_lock(); | |
5226 | ||
5227 | app = ust_app_find_by_pid(pid); | |
5228 | if (app == NULL) { | |
5229 | ERR("UST app enable event per PID %d not found", pid); | |
5230 | ret = -1; | |
d0b96690 | 5231 | goto end; |
76d45b40 DG |
5232 | } |
5233 | ||
e0c7ec2b DG |
5234 | if (!app->compatible) { |
5235 | ret = 0; | |
d0b96690 | 5236 | goto end; |
e0c7ec2b DG |
5237 | } |
5238 | ||
76d45b40 | 5239 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
5240 | if (!ua_sess) { |
5241 | /* The application has problem or is probably dead. */ | |
d0b96690 DG |
5242 | ret = 0; |
5243 | goto end; | |
c4a1715b | 5244 | } |
76d45b40 | 5245 | |
d0b96690 | 5246 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
5247 | |
5248 | if (ua_sess->deleted) { | |
5249 | ret = 0; | |
5250 | goto end_unlock; | |
5251 | } | |
5252 | ||
76d45b40 | 5253 | /* Lookup channel in the ust app session */ |
bec39940 DG |
5254 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
5255 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
76d45b40 DG |
5256 | /* If the channel is not found, there is a code flow error */ |
5257 | assert(ua_chan_node); | |
5258 | ||
5259 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
5260 | ||
18eace3b | 5261 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 5262 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 5263 | if (ua_event == NULL) { |
76d45b40 DG |
5264 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
5265 | if (ret < 0) { | |
d0b96690 | 5266 | goto end_unlock; |
76d45b40 DG |
5267 | } |
5268 | } else { | |
76d45b40 DG |
5269 | ret = enable_ust_app_event(ua_sess, ua_event, app); |
5270 | if (ret < 0) { | |
d0b96690 | 5271 | goto end_unlock; |
76d45b40 DG |
5272 | } |
5273 | } | |
5274 | ||
d0b96690 DG |
5275 | end_unlock: |
5276 | pthread_mutex_unlock(&ua_sess->lock); | |
5277 | end: | |
76d45b40 DG |
5278 | rcu_read_unlock(); |
5279 | return ret; | |
5280 | } | |
7f79d3a1 | 5281 | |
d0b96690 DG |
5282 | /* |
5283 | * Receive registration and populate the given msg structure. | |
5284 | * | |
5285 | * On success return 0 else a negative value returned by the ustctl call. | |
5286 | */ | |
5287 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
5288 | { | |
5289 | int ret; | |
5290 | uint32_t pid, ppid, uid, gid; | |
5291 | ||
5292 | assert(msg); | |
5293 | ||
5294 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
5295 | &pid, &ppid, &uid, &gid, | |
5296 | &msg->bits_per_long, | |
5297 | &msg->uint8_t_alignment, | |
5298 | &msg->uint16_t_alignment, | |
5299 | &msg->uint32_t_alignment, | |
5300 | &msg->uint64_t_alignment, | |
5301 | &msg->long_alignment, | |
5302 | &msg->byte_order, | |
5303 | msg->name); | |
5304 | if (ret < 0) { | |
5305 | switch (-ret) { | |
5306 | case EPIPE: | |
5307 | case ECONNRESET: | |
5308 | case LTTNG_UST_ERR_EXITING: | |
5309 | DBG3("UST app recv reg message failed. Application died"); | |
5310 | break; | |
5311 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
5312 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
5313 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
5314 | LTTNG_UST_ABI_MINOR_VERSION); | |
5315 | break; | |
5316 | default: | |
5317 | ERR("UST app recv reg message failed with ret %d", ret); | |
5318 | break; | |
5319 | } | |
5320 | goto error; | |
5321 | } | |
5322 | msg->pid = (pid_t) pid; | |
5323 | msg->ppid = (pid_t) ppid; | |
5324 | msg->uid = (uid_t) uid; | |
5325 | msg->gid = (gid_t) gid; | |
5326 | ||
5327 | error: | |
5328 | return ret; | |
5329 | } | |
5330 | ||
10b56aef MD |
5331 | /* |
5332 | * Return a ust app session object using the application object and the | |
5333 | * session object descriptor has a key. If not found, NULL is returned. | |
5334 | * A RCU read side lock MUST be acquired when calling this function. | |
5335 | */ | |
5336 | static struct ust_app_session *find_session_by_objd(struct ust_app *app, | |
5337 | int objd) | |
5338 | { | |
5339 | struct lttng_ht_node_ulong *node; | |
5340 | struct lttng_ht_iter iter; | |
5341 | struct ust_app_session *ua_sess = NULL; | |
5342 | ||
5343 | assert(app); | |
5344 | ||
5345 | lttng_ht_lookup(app->ust_sessions_objd, (void *)((unsigned long) objd), &iter); | |
5346 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5347 | if (node == NULL) { | |
5348 | DBG2("UST app session find by objd %d not found", objd); | |
5349 | goto error; | |
5350 | } | |
5351 | ||
5352 | ua_sess = caa_container_of(node, struct ust_app_session, ust_objd_node); | |
5353 | ||
5354 | error: | |
5355 | return ua_sess; | |
5356 | } | |
5357 | ||
d88aee68 DG |
5358 | /* |
5359 | * Return a ust app channel object using the application object and the channel | |
5360 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
5361 | * lock MUST be acquired before calling this function. | |
5362 | */ | |
d0b96690 DG |
5363 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
5364 | int objd) | |
5365 | { | |
5366 | struct lttng_ht_node_ulong *node; | |
5367 | struct lttng_ht_iter iter; | |
5368 | struct ust_app_channel *ua_chan = NULL; | |
5369 | ||
5370 | assert(app); | |
5371 | ||
5372 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
5373 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5374 | if (node == NULL) { | |
5375 | DBG2("UST app channel find by objd %d not found", objd); | |
5376 | goto error; | |
5377 | } | |
5378 | ||
5379 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
5380 | ||
5381 | error: | |
5382 | return ua_chan; | |
5383 | } | |
5384 | ||
d88aee68 DG |
5385 | /* |
5386 | * Reply to a register channel notification from an application on the notify | |
5387 | * socket. The channel metadata is also created. | |
5388 | * | |
5389 | * The session UST registry lock is acquired in this function. | |
5390 | * | |
5391 | * On success 0 is returned else a negative value. | |
5392 | */ | |
d0b96690 DG |
5393 | static int reply_ust_register_channel(int sock, int sobjd, int cobjd, |
5394 | size_t nr_fields, struct ustctl_field *fields) | |
5395 | { | |
5396 | int ret, ret_code = 0; | |
5397 | uint32_t chan_id, reg_count; | |
7972aab2 | 5398 | uint64_t chan_reg_key; |
d0b96690 DG |
5399 | enum ustctl_channel_header type; |
5400 | struct ust_app *app; | |
5401 | struct ust_app_channel *ua_chan; | |
5402 | struct ust_app_session *ua_sess; | |
7972aab2 | 5403 | struct ust_registry_session *registry; |
45893984 | 5404 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
5405 | |
5406 | rcu_read_lock(); | |
5407 | ||
5408 | /* Lookup application. If not found, there is a code flow error. */ | |
5409 | app = find_app_by_notify_sock(sock); | |
d88aee68 | 5410 | if (!app) { |
fad1ed2f | 5411 | DBG("Application socket %d is being torn down. Abort event notify", |
d88aee68 DG |
5412 | sock); |
5413 | ret = 0; | |
5414 | goto error_rcu_unlock; | |
5415 | } | |
d0b96690 | 5416 | |
4950b860 | 5417 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 5418 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 | 5419 | if (!ua_chan) { |
fad1ed2f | 5420 | DBG("Application channel is being torn down. Abort event notify"); |
4950b860 MD |
5421 | ret = 0; |
5422 | goto error_rcu_unlock; | |
5423 | } | |
5424 | ||
d0b96690 DG |
5425 | assert(ua_chan->session); |
5426 | ua_sess = ua_chan->session; | |
d0b96690 | 5427 | |
7972aab2 DG |
5428 | /* Get right session registry depending on the session buffer type. */ |
5429 | registry = get_session_registry(ua_sess); | |
fad1ed2f JR |
5430 | if (!registry) { |
5431 | DBG("Application session is being torn down. Abort event notify"); | |
5432 | ret = 0; | |
5433 | goto error_rcu_unlock; | |
5434 | }; | |
45893984 | 5435 | |
7972aab2 DG |
5436 | /* Depending on the buffer type, a different channel key is used. */ |
5437 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
5438 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 5439 | } else { |
7972aab2 | 5440 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
5441 | } |
5442 | ||
7972aab2 DG |
5443 | pthread_mutex_lock(®istry->lock); |
5444 | ||
5445 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
5446 | assert(chan_reg); | |
5447 | ||
5448 | if (!chan_reg->register_done) { | |
5449 | reg_count = ust_registry_get_event_count(chan_reg); | |
5450 | if (reg_count < 31) { | |
5451 | type = USTCTL_CHANNEL_HEADER_COMPACT; | |
5452 | } else { | |
5453 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
5454 | } | |
5455 | ||
5456 | chan_reg->nr_ctx_fields = nr_fields; | |
5457 | chan_reg->ctx_fields = fields; | |
fad1ed2f | 5458 | fields = NULL; |
7972aab2 | 5459 | chan_reg->header_type = type; |
d0b96690 | 5460 | } else { |
7972aab2 DG |
5461 | /* Get current already assigned values. */ |
5462 | type = chan_reg->header_type; | |
d0b96690 | 5463 | } |
7972aab2 DG |
5464 | /* Channel id is set during the object creation. */ |
5465 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
5466 | |
5467 | /* Append to metadata */ | |
7972aab2 DG |
5468 | if (!chan_reg->metadata_dumped) { |
5469 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
5470 | if (ret_code) { |
5471 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
5472 | goto reply; | |
5473 | } | |
5474 | } | |
5475 | ||
5476 | reply: | |
7972aab2 DG |
5477 | DBG3("UST app replying to register channel key %" PRIu64 |
5478 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
5479 | ret_code); | |
d0b96690 DG |
5480 | |
5481 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
5482 | if (ret < 0) { | |
5483 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5484 | ERR("UST app reply channel failed with ret %d", ret); | |
5485 | } else { | |
5486 | DBG3("UST app reply channel failed. Application died"); | |
5487 | } | |
5488 | goto error; | |
5489 | } | |
5490 | ||
7972aab2 DG |
5491 | /* This channel registry registration is completed. */ |
5492 | chan_reg->register_done = 1; | |
5493 | ||
d0b96690 | 5494 | error: |
7972aab2 | 5495 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 5496 | error_rcu_unlock: |
d0b96690 | 5497 | rcu_read_unlock(); |
fad1ed2f | 5498 | free(fields); |
d0b96690 DG |
5499 | return ret; |
5500 | } | |
5501 | ||
d88aee68 DG |
5502 | /* |
5503 | * Add event to the UST channel registry. When the event is added to the | |
5504 | * registry, the metadata is also created. Once done, this replies to the | |
5505 | * application with the appropriate error code. | |
5506 | * | |
5507 | * The session UST registry lock is acquired in the function. | |
5508 | * | |
5509 | * On success 0 is returned else a negative value. | |
5510 | */ | |
d0b96690 | 5511 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
2106efa0 PP |
5512 | char *sig, size_t nr_fields, struct ustctl_field *fields, |
5513 | int loglevel_value, char *model_emf_uri) | |
d0b96690 DG |
5514 | { |
5515 | int ret, ret_code; | |
5516 | uint32_t event_id = 0; | |
7972aab2 | 5517 | uint64_t chan_reg_key; |
d0b96690 DG |
5518 | struct ust_app *app; |
5519 | struct ust_app_channel *ua_chan; | |
5520 | struct ust_app_session *ua_sess; | |
7972aab2 | 5521 | struct ust_registry_session *registry; |
d0b96690 DG |
5522 | |
5523 | rcu_read_lock(); | |
5524 | ||
5525 | /* Lookup application. If not found, there is a code flow error. */ | |
5526 | app = find_app_by_notify_sock(sock); | |
d88aee68 | 5527 | if (!app) { |
fad1ed2f | 5528 | DBG("Application socket %d is being torn down. Abort event notify", |
d88aee68 DG |
5529 | sock); |
5530 | ret = 0; | |
5531 | goto error_rcu_unlock; | |
5532 | } | |
d0b96690 | 5533 | |
4950b860 | 5534 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 5535 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 | 5536 | if (!ua_chan) { |
fad1ed2f | 5537 | DBG("Application channel is being torn down. Abort event notify"); |
4950b860 MD |
5538 | ret = 0; |
5539 | goto error_rcu_unlock; | |
5540 | } | |
5541 | ||
d0b96690 DG |
5542 | assert(ua_chan->session); |
5543 | ua_sess = ua_chan->session; | |
5544 | ||
7972aab2 | 5545 | registry = get_session_registry(ua_sess); |
fad1ed2f JR |
5546 | if (!registry) { |
5547 | DBG("Application session is being torn down. Abort event notify"); | |
5548 | ret = 0; | |
5549 | goto error_rcu_unlock; | |
5550 | } | |
7972aab2 DG |
5551 | |
5552 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
5553 | chan_reg_key = ua_chan->tracing_channel_id; | |
5554 | } else { | |
5555 | chan_reg_key = ua_chan->key; | |
5556 | } | |
5557 | ||
5558 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 5559 | |
d5d629b5 DG |
5560 | /* |
5561 | * From this point on, this call acquires the ownership of the sig, fields | |
5562 | * and model_emf_uri meaning any free are done inside it if needed. These | |
5563 | * three variables MUST NOT be read/write after this. | |
5564 | */ | |
7972aab2 | 5565 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
2106efa0 PP |
5566 | sobjd, cobjd, name, sig, nr_fields, fields, |
5567 | loglevel_value, model_emf_uri, ua_sess->buffer_type, | |
5568 | &event_id, app); | |
fad1ed2f JR |
5569 | sig = NULL; |
5570 | fields = NULL; | |
5571 | model_emf_uri = NULL; | |
d0b96690 DG |
5572 | |
5573 | /* | |
5574 | * The return value is returned to ustctl so in case of an error, the | |
5575 | * application can be notified. In case of an error, it's important not to | |
5576 | * return a negative error or else the application will get closed. | |
5577 | */ | |
5578 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
5579 | if (ret < 0) { | |
5580 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5581 | ERR("UST app reply event failed with ret %d", ret); | |
5582 | } else { | |
5583 | DBG3("UST app reply event failed. Application died"); | |
5584 | } | |
5585 | /* | |
5586 | * No need to wipe the create event since the application socket will | |
5587 | * get close on error hence cleaning up everything by itself. | |
5588 | */ | |
5589 | goto error; | |
5590 | } | |
5591 | ||
7972aab2 DG |
5592 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
5593 | name, event_id); | |
d88aee68 | 5594 | |
d0b96690 | 5595 | error: |
7972aab2 | 5596 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 5597 | error_rcu_unlock: |
d0b96690 | 5598 | rcu_read_unlock(); |
fad1ed2f JR |
5599 | free(sig); |
5600 | free(fields); | |
5601 | free(model_emf_uri); | |
d0b96690 DG |
5602 | return ret; |
5603 | } | |
5604 | ||
10b56aef MD |
5605 | /* |
5606 | * Add enum to the UST session registry. Once done, this replies to the | |
5607 | * application with the appropriate error code. | |
5608 | * | |
5609 | * The session UST registry lock is acquired within this function. | |
5610 | * | |
5611 | * On success 0 is returned else a negative value. | |
5612 | */ | |
5613 | static int add_enum_ust_registry(int sock, int sobjd, char *name, | |
5614 | struct ustctl_enum_entry *entries, size_t nr_entries) | |
5615 | { | |
5616 | int ret = 0, ret_code; | |
5617 | struct ust_app *app; | |
5618 | struct ust_app_session *ua_sess; | |
5619 | struct ust_registry_session *registry; | |
5620 | uint64_t enum_id = -1ULL; | |
5621 | ||
5622 | rcu_read_lock(); | |
5623 | ||
5624 | /* Lookup application. If not found, there is a code flow error. */ | |
5625 | app = find_app_by_notify_sock(sock); | |
5626 | if (!app) { | |
5627 | /* Return an error since this is not an error */ | |
5628 | DBG("Application socket %d is being torn down. Aborting enum registration", | |
5629 | sock); | |
5630 | free(entries); | |
5631 | goto error_rcu_unlock; | |
5632 | } | |
5633 | ||
5634 | /* Lookup session by UST object descriptor. */ | |
5635 | ua_sess = find_session_by_objd(app, sobjd); | |
5636 | if (!ua_sess) { | |
5637 | /* Return an error since this is not an error */ | |
fad1ed2f | 5638 | DBG("Application session is being torn down (session not found). Aborting enum registration."); |
10b56aef MD |
5639 | free(entries); |
5640 | goto error_rcu_unlock; | |
5641 | } | |
5642 | ||
5643 | registry = get_session_registry(ua_sess); | |
fad1ed2f JR |
5644 | if (!registry) { |
5645 | DBG("Application session is being torn down (registry not found). Aborting enum registration."); | |
5646 | free(entries); | |
5647 | goto error_rcu_unlock; | |
5648 | } | |
10b56aef MD |
5649 | |
5650 | pthread_mutex_lock(®istry->lock); | |
5651 | ||
5652 | /* | |
5653 | * From this point on, the callee acquires the ownership of | |
5654 | * entries. The variable entries MUST NOT be read/written after | |
5655 | * call. | |
5656 | */ | |
5657 | ret_code = ust_registry_create_or_find_enum(registry, sobjd, name, | |
5658 | entries, nr_entries, &enum_id); | |
5659 | entries = NULL; | |
5660 | ||
5661 | /* | |
5662 | * The return value is returned to ustctl so in case of an error, the | |
5663 | * application can be notified. In case of an error, it's important not to | |
5664 | * return a negative error or else the application will get closed. | |
5665 | */ | |
5666 | ret = ustctl_reply_register_enum(sock, enum_id, ret_code); | |
5667 | if (ret < 0) { | |
5668 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5669 | ERR("UST app reply enum failed with ret %d", ret); | |
5670 | } else { | |
5671 | DBG3("UST app reply enum failed. Application died"); | |
5672 | } | |
5673 | /* | |
5674 | * No need to wipe the create enum since the application socket will | |
5675 | * get close on error hence cleaning up everything by itself. | |
5676 | */ | |
5677 | goto error; | |
5678 | } | |
5679 | ||
5680 | DBG3("UST registry enum %s added successfully or already found", name); | |
5681 | ||
5682 | error: | |
5683 | pthread_mutex_unlock(®istry->lock); | |
5684 | error_rcu_unlock: | |
5685 | rcu_read_unlock(); | |
5686 | return ret; | |
5687 | } | |
5688 | ||
d88aee68 DG |
5689 | /* |
5690 | * Handle application notification through the given notify socket. | |
5691 | * | |
5692 | * Return 0 on success or else a negative value. | |
5693 | */ | |
d0b96690 DG |
5694 | int ust_app_recv_notify(int sock) |
5695 | { | |
5696 | int ret; | |
5697 | enum ustctl_notify_cmd cmd; | |
5698 | ||
5699 | DBG3("UST app receiving notify from sock %d", sock); | |
5700 | ||
5701 | ret = ustctl_recv_notify(sock, &cmd); | |
5702 | if (ret < 0) { | |
5703 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5704 | ERR("UST app recv notify failed with ret %d", ret); | |
5705 | } else { | |
5706 | DBG3("UST app recv notify failed. Application died"); | |
5707 | } | |
5708 | goto error; | |
5709 | } | |
5710 | ||
5711 | switch (cmd) { | |
5712 | case USTCTL_NOTIFY_CMD_EVENT: | |
5713 | { | |
2106efa0 | 5714 | int sobjd, cobjd, loglevel_value; |
d0b96690 DG |
5715 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; |
5716 | size_t nr_fields; | |
5717 | struct ustctl_field *fields; | |
5718 | ||
5719 | DBG2("UST app ustctl register event received"); | |
5720 | ||
2106efa0 PP |
5721 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, |
5722 | &loglevel_value, &sig, &nr_fields, &fields, | |
5723 | &model_emf_uri); | |
d0b96690 DG |
5724 | if (ret < 0) { |
5725 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5726 | ERR("UST app recv event failed with ret %d", ret); | |
5727 | } else { | |
5728 | DBG3("UST app recv event failed. Application died"); | |
5729 | } | |
5730 | goto error; | |
5731 | } | |
5732 | ||
d5d629b5 DG |
5733 | /* |
5734 | * Add event to the UST registry coming from the notify socket. This | |
5735 | * call will free if needed the sig, fields and model_emf_uri. This | |
5736 | * code path loses the ownsership of these variables and transfer them | |
5737 | * to the this function. | |
5738 | */ | |
d0b96690 | 5739 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
2106efa0 | 5740 | fields, loglevel_value, model_emf_uri); |
d0b96690 DG |
5741 | if (ret < 0) { |
5742 | goto error; | |
5743 | } | |
5744 | ||
5745 | break; | |
5746 | } | |
5747 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
5748 | { | |
5749 | int sobjd, cobjd; | |
5750 | size_t nr_fields; | |
5751 | struct ustctl_field *fields; | |
5752 | ||
5753 | DBG2("UST app ustctl register channel received"); | |
5754 | ||
5755 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
5756 | &fields); | |
5757 | if (ret < 0) { | |
5758 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5759 | ERR("UST app recv channel failed with ret %d", ret); | |
5760 | } else { | |
5761 | DBG3("UST app recv channel failed. Application died"); | |
5762 | } | |
5763 | goto error; | |
5764 | } | |
5765 | ||
d5d629b5 DG |
5766 | /* |
5767 | * The fields ownership are transfered to this function call meaning | |
5768 | * that if needed it will be freed. After this, it's invalid to access | |
5769 | * fields or clean it up. | |
5770 | */ | |
d0b96690 DG |
5771 | ret = reply_ust_register_channel(sock, sobjd, cobjd, nr_fields, |
5772 | fields); | |
5773 | if (ret < 0) { | |
5774 | goto error; | |
5775 | } | |
5776 | ||
5777 | break; | |
5778 | } | |
10b56aef MD |
5779 | case USTCTL_NOTIFY_CMD_ENUM: |
5780 | { | |
5781 | int sobjd; | |
5782 | char name[LTTNG_UST_SYM_NAME_LEN]; | |
5783 | size_t nr_entries; | |
5784 | struct ustctl_enum_entry *entries; | |
5785 | ||
5786 | DBG2("UST app ustctl register enum received"); | |
5787 | ||
5788 | ret = ustctl_recv_register_enum(sock, &sobjd, name, | |
5789 | &entries, &nr_entries); | |
5790 | if (ret < 0) { | |
5791 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5792 | ERR("UST app recv enum failed with ret %d", ret); | |
5793 | } else { | |
5794 | DBG3("UST app recv enum failed. Application died"); | |
5795 | } | |
5796 | goto error; | |
5797 | } | |
5798 | ||
5799 | /* Callee assumes ownership of entries */ | |
5800 | ret = add_enum_ust_registry(sock, sobjd, name, | |
5801 | entries, nr_entries); | |
5802 | if (ret < 0) { | |
5803 | goto error; | |
5804 | } | |
5805 | ||
5806 | break; | |
5807 | } | |
d0b96690 DG |
5808 | default: |
5809 | /* Should NEVER happen. */ | |
5810 | assert(0); | |
5811 | } | |
5812 | ||
5813 | error: | |
5814 | return ret; | |
5815 | } | |
d88aee68 DG |
5816 | |
5817 | /* | |
5818 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
5819 | * corresponding application. On failure, the call_rcu to close the socket is | |
5820 | * executed. If an application is found, it tries to delete it from the notify | |
5821 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
5822 | * | |
5823 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
5824 | * call RCU is not done but the rest of the cleanup is. | |
5825 | */ | |
5826 | void ust_app_notify_sock_unregister(int sock) | |
5827 | { | |
5828 | int err_enomem = 0; | |
5829 | struct lttng_ht_iter iter; | |
5830 | struct ust_app *app; | |
5831 | struct ust_app_notify_sock_obj *obj; | |
5832 | ||
5833 | assert(sock >= 0); | |
5834 | ||
5835 | rcu_read_lock(); | |
5836 | ||
5837 | obj = zmalloc(sizeof(*obj)); | |
5838 | if (!obj) { | |
5839 | /* | |
5840 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
5841 | * procedure but the call_rcu will not be called. In this case, we | |
5842 | * accept the fd leak rather than possibly creating an unsynchronized | |
5843 | * state between threads. | |
5844 | * | |
5845 | * TODO: The notify object should be created once the notify socket is | |
5846 | * registered and stored independantely from the ust app object. The | |
5847 | * tricky part is to synchronize the teardown of the application and | |
5848 | * this notify object. Let's keep that in mind so we can avoid this | |
5849 | * kind of shenanigans with ENOMEM in the teardown path. | |
5850 | */ | |
5851 | err_enomem = 1; | |
5852 | } else { | |
5853 | obj->fd = sock; | |
5854 | } | |
5855 | ||
5856 | DBG("UST app notify socket unregister %d", sock); | |
5857 | ||
5858 | /* | |
5859 | * Lookup application by notify socket. If this fails, this means that the | |
5860 | * hash table delete has already been done by the application | |
5861 | * unregistration process so we can safely close the notify socket in a | |
5862 | * call RCU. | |
5863 | */ | |
5864 | app = find_app_by_notify_sock(sock); | |
5865 | if (!app) { | |
5866 | goto close_socket; | |
5867 | } | |
5868 | ||
5869 | iter.iter.node = &app->notify_sock_n.node; | |
5870 | ||
5871 | /* | |
5872 | * Whatever happens here either we fail or succeed, in both cases we have | |
5873 | * to close the socket after a grace period to continue to the call RCU | |
5874 | * here. If the deletion is successful, the application is not visible | |
5875 | * anymore by other threads and is it fails it means that it was already | |
5876 | * deleted from the hash table so either way we just have to close the | |
5877 | * socket. | |
5878 | */ | |
5879 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
5880 | ||
5881 | close_socket: | |
5882 | rcu_read_unlock(); | |
5883 | ||
5884 | /* | |
5885 | * Close socket after a grace period to avoid for the socket to be reused | |
5886 | * before the application object is freed creating potential race between | |
5887 | * threads trying to add unique in the global hash table. | |
5888 | */ | |
5889 | if (!err_enomem) { | |
5890 | call_rcu(&obj->head, close_notify_sock_rcu); | |
5891 | } | |
5892 | } | |
f45e313d DG |
5893 | |
5894 | /* | |
5895 | * Destroy a ust app data structure and free its memory. | |
5896 | */ | |
5897 | void ust_app_destroy(struct ust_app *app) | |
5898 | { | |
5899 | if (!app) { | |
5900 | return; | |
5901 | } | |
5902 | ||
5903 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
5904 | } | |
6dc3064a DG |
5905 | |
5906 | /* | |
5907 | * Take a snapshot for a given UST session. The snapshot is sent to the given | |
5908 | * output. | |
5909 | * | |
5910 | * Return 0 on success or else a negative value. | |
5911 | */ | |
5912 | int ust_app_snapshot_record(struct ltt_ust_session *usess, | |
d07ceecd MD |
5913 | struct snapshot_output *output, int wait, |
5914 | uint64_t nb_packets_per_stream) | |
6dc3064a DG |
5915 | { |
5916 | int ret = 0; | |
5917 | struct lttng_ht_iter iter; | |
5918 | struct ust_app *app; | |
af706bb7 | 5919 | char pathname[PATH_MAX]; |
6dc3064a DG |
5920 | |
5921 | assert(usess); | |
5922 | assert(output); | |
5923 | ||
5924 | rcu_read_lock(); | |
5925 | ||
8c924c7b MD |
5926 | switch (usess->buffer_type) { |
5927 | case LTTNG_BUFFER_PER_UID: | |
5928 | { | |
5929 | struct buffer_reg_uid *reg; | |
6dc3064a | 5930 | |
8c924c7b MD |
5931 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
5932 | struct buffer_reg_channel *reg_chan; | |
5933 | struct consumer_socket *socket; | |
6dc3064a | 5934 | |
8c924c7b MD |
5935 | /* Get consumer socket to use to push the metadata.*/ |
5936 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
5937 | usess->consumer); | |
5938 | if (!socket) { | |
5939 | ret = -EINVAL; | |
5940 | goto error; | |
5941 | } | |
6dc3064a | 5942 | |
8c924c7b MD |
5943 | memset(pathname, 0, sizeof(pathname)); |
5944 | ret = snprintf(pathname, sizeof(pathname), | |
5945 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH, | |
5946 | reg->uid, reg->bits_per_long); | |
5947 | if (ret < 0) { | |
5948 | PERROR("snprintf snapshot path"); | |
5949 | goto error; | |
5950 | } | |
5951 | ||
5952 | /* Add the UST default trace dir to path. */ | |
5953 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
5954 | reg_chan, node.node) { | |
68808f4e DG |
5955 | ret = consumer_snapshot_channel(socket, reg_chan->consumer_key, |
5956 | output, 0, usess->uid, usess->gid, pathname, wait, | |
d07ceecd | 5957 | nb_packets_per_stream); |
8c924c7b MD |
5958 | if (ret < 0) { |
5959 | goto error; | |
5960 | } | |
5961 | } | |
68808f4e DG |
5962 | ret = consumer_snapshot_channel(socket, |
5963 | reg->registry->reg.ust->metadata_key, output, 1, | |
d07ceecd | 5964 | usess->uid, usess->gid, pathname, wait, 0); |
8c924c7b MD |
5965 | if (ret < 0) { |
5966 | goto error; | |
5967 | } | |
af706bb7 | 5968 | } |
8c924c7b MD |
5969 | break; |
5970 | } | |
5971 | case LTTNG_BUFFER_PER_PID: | |
5972 | { | |
5973 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5974 | struct consumer_socket *socket; | |
5975 | struct lttng_ht_iter chan_iter; | |
5976 | struct ust_app_channel *ua_chan; | |
5977 | struct ust_app_session *ua_sess; | |
5978 | struct ust_registry_session *registry; | |
5979 | ||
5980 | ua_sess = lookup_session_by_app(usess, app); | |
5981 | if (!ua_sess) { | |
5982 | /* Session not associated with this app. */ | |
5983 | continue; | |
5984 | } | |
af706bb7 | 5985 | |
8c924c7b MD |
5986 | /* Get the right consumer socket for the application. */ |
5987 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
5988 | output->consumer); | |
5989 | if (!socket) { | |
5c786ded | 5990 | ret = -EINVAL; |
5c786ded JD |
5991 | goto error; |
5992 | } | |
5993 | ||
8c924c7b MD |
5994 | /* Add the UST default trace dir to path. */ |
5995 | memset(pathname, 0, sizeof(pathname)); | |
5996 | ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "/%s", | |
5997 | ua_sess->path); | |
6dc3064a | 5998 | if (ret < 0) { |
8c924c7b | 5999 | PERROR("snprintf snapshot path"); |
6dc3064a DG |
6000 | goto error; |
6001 | } | |
6dc3064a | 6002 | |
8c924c7b MD |
6003 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, |
6004 | ua_chan, node.node) { | |
68808f4e DG |
6005 | ret = consumer_snapshot_channel(socket, ua_chan->key, output, |
6006 | 0, ua_sess->euid, ua_sess->egid, pathname, wait, | |
d07ceecd | 6007 | nb_packets_per_stream); |
8c924c7b MD |
6008 | if (ret < 0) { |
6009 | goto error; | |
6010 | } | |
6011 | } | |
6012 | ||
6013 | registry = get_session_registry(ua_sess); | |
fad1ed2f JR |
6014 | if (!registry) { |
6015 | DBG("Application session is being torn down. Abort snapshot record."); | |
6016 | ret = -1; | |
6017 | goto error; | |
6018 | } | |
8c924c7b | 6019 | ret = consumer_snapshot_channel(socket, registry->metadata_key, output, |
d07ceecd | 6020 | 1, ua_sess->euid, ua_sess->egid, pathname, wait, 0); |
8c924c7b MD |
6021 | if (ret < 0) { |
6022 | goto error; | |
6023 | } | |
6024 | } | |
6025 | break; | |
6026 | } | |
6027 | default: | |
6028 | assert(0); | |
6029 | break; | |
6dc3064a DG |
6030 | } |
6031 | ||
6032 | error: | |
6033 | rcu_read_unlock(); | |
6034 | return ret; | |
6035 | } | |
5c786ded JD |
6036 | |
6037 | /* | |
d07ceecd | 6038 | * Return the size taken by one more packet per stream. |
5c786ded | 6039 | */ |
d07ceecd MD |
6040 | uint64_t ust_app_get_size_one_more_packet_per_stream(struct ltt_ust_session *usess, |
6041 | uint64_t cur_nr_packets) | |
5c786ded | 6042 | { |
d07ceecd | 6043 | uint64_t tot_size = 0; |
5c786ded JD |
6044 | struct ust_app *app; |
6045 | struct lttng_ht_iter iter; | |
6046 | ||
6047 | assert(usess); | |
6048 | ||
6049 | switch (usess->buffer_type) { | |
6050 | case LTTNG_BUFFER_PER_UID: | |
6051 | { | |
6052 | struct buffer_reg_uid *reg; | |
6053 | ||
6054 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
6055 | struct buffer_reg_channel *reg_chan; | |
6056 | ||
b7064eaa | 6057 | rcu_read_lock(); |
5c786ded JD |
6058 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
6059 | reg_chan, node.node) { | |
d07ceecd MD |
6060 | if (cur_nr_packets >= reg_chan->num_subbuf) { |
6061 | /* | |
6062 | * Don't take channel into account if we | |
6063 | * already grab all its packets. | |
6064 | */ | |
6065 | continue; | |
6066 | } | |
6067 | tot_size += reg_chan->subbuf_size * reg_chan->stream_count; | |
5c786ded | 6068 | } |
b7064eaa | 6069 | rcu_read_unlock(); |
5c786ded JD |
6070 | } |
6071 | break; | |
6072 | } | |
6073 | case LTTNG_BUFFER_PER_PID: | |
6074 | { | |
6075 | rcu_read_lock(); | |
6076 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6077 | struct ust_app_channel *ua_chan; | |
6078 | struct ust_app_session *ua_sess; | |
6079 | struct lttng_ht_iter chan_iter; | |
6080 | ||
6081 | ua_sess = lookup_session_by_app(usess, app); | |
6082 | if (!ua_sess) { | |
6083 | /* Session not associated with this app. */ | |
6084 | continue; | |
6085 | } | |
6086 | ||
6087 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
6088 | ua_chan, node.node) { | |
d07ceecd MD |
6089 | if (cur_nr_packets >= ua_chan->attr.num_subbuf) { |
6090 | /* | |
6091 | * Don't take channel into account if we | |
6092 | * already grab all its packets. | |
6093 | */ | |
6094 | continue; | |
6095 | } | |
6096 | tot_size += ua_chan->attr.subbuf_size * ua_chan->streams.count; | |
5c786ded JD |
6097 | } |
6098 | } | |
6099 | rcu_read_unlock(); | |
6100 | break; | |
6101 | } | |
6102 | default: | |
6103 | assert(0); | |
6104 | break; | |
6105 | } | |
6106 | ||
d07ceecd | 6107 | return tot_size; |
5c786ded | 6108 | } |
fb83fe64 JD |
6109 | |
6110 | int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id, | |
6111 | struct cds_list_head *buffer_reg_uid_list, | |
6112 | struct consumer_output *consumer, uint64_t uchan_id, | |
6113 | int overwrite, uint64_t *discarded, uint64_t *lost) | |
6114 | { | |
6115 | int ret; | |
6116 | uint64_t consumer_chan_key; | |
6117 | ||
70dd8162 MD |
6118 | *discarded = 0; |
6119 | *lost = 0; | |
6120 | ||
fb83fe64 JD |
6121 | ret = buffer_reg_uid_consumer_channel_key( |
6122 | buffer_reg_uid_list, ust_session_id, | |
6123 | uchan_id, &consumer_chan_key); | |
6124 | if (ret < 0) { | |
70dd8162 MD |
6125 | /* Not found */ |
6126 | ret = 0; | |
fb83fe64 JD |
6127 | goto end; |
6128 | } | |
6129 | ||
6130 | if (overwrite) { | |
6131 | ret = consumer_get_lost_packets(ust_session_id, | |
6132 | consumer_chan_key, consumer, lost); | |
6133 | } else { | |
6134 | ret = consumer_get_discarded_events(ust_session_id, | |
6135 | consumer_chan_key, consumer, discarded); | |
6136 | } | |
6137 | ||
6138 | end: | |
6139 | return ret; | |
6140 | } | |
6141 | ||
6142 | int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess, | |
6143 | struct ltt_ust_channel *uchan, | |
6144 | struct consumer_output *consumer, int overwrite, | |
6145 | uint64_t *discarded, uint64_t *lost) | |
6146 | { | |
6147 | int ret = 0; | |
6148 | struct lttng_ht_iter iter; | |
6149 | struct lttng_ht_node_str *ua_chan_node; | |
6150 | struct ust_app *app; | |
6151 | struct ust_app_session *ua_sess; | |
6152 | struct ust_app_channel *ua_chan; | |
6153 | ||
70dd8162 MD |
6154 | *discarded = 0; |
6155 | *lost = 0; | |
6156 | ||
fb83fe64 JD |
6157 | rcu_read_lock(); |
6158 | /* | |
70dd8162 MD |
6159 | * Iterate over every registered applications. Sum counters for |
6160 | * all applications containing requested session and channel. | |
fb83fe64 JD |
6161 | */ |
6162 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6163 | struct lttng_ht_iter uiter; | |
6164 | ||
6165 | ua_sess = lookup_session_by_app(usess, app); | |
6166 | if (ua_sess == NULL) { | |
6167 | continue; | |
6168 | } | |
6169 | ||
6170 | /* Get channel */ | |
ee022399 | 6171 | lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &uiter); |
fb83fe64 JD |
6172 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); |
6173 | /* If the session is found for the app, the channel must be there */ | |
6174 | assert(ua_chan_node); | |
6175 | ||
6176 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
6177 | ||
6178 | if (overwrite) { | |
70dd8162 MD |
6179 | uint64_t _lost; |
6180 | ||
fb83fe64 | 6181 | ret = consumer_get_lost_packets(usess->id, ua_chan->key, |
70dd8162 MD |
6182 | consumer, &_lost); |
6183 | if (ret < 0) { | |
6184 | break; | |
6185 | } | |
6186 | (*lost) += _lost; | |
fb83fe64 | 6187 | } else { |
70dd8162 MD |
6188 | uint64_t _discarded; |
6189 | ||
fb83fe64 | 6190 | ret = consumer_get_discarded_events(usess->id, |
70dd8162 MD |
6191 | ua_chan->key, consumer, &_discarded); |
6192 | if (ret < 0) { | |
6193 | break; | |
6194 | } | |
6195 | (*discarded) += _discarded; | |
fb83fe64 | 6196 | } |
fb83fe64 JD |
6197 | } |
6198 | ||
fb83fe64 JD |
6199 | rcu_read_unlock(); |
6200 | return ret; | |
6201 | } | |
c2561365 JD |
6202 | |
6203 | static | |
6204 | int ust_app_regenerate_statedump(struct ltt_ust_session *usess, | |
6205 | struct ust_app *app) | |
6206 | { | |
6207 | int ret = 0; | |
6208 | struct ust_app_session *ua_sess; | |
6209 | ||
6210 | DBG("Regenerating the metadata for ust app pid %d", app->pid); | |
6211 | ||
6212 | rcu_read_lock(); | |
6213 | ||
6214 | ua_sess = lookup_session_by_app(usess, app); | |
6215 | if (ua_sess == NULL) { | |
6216 | /* The session is in teardown process. Ignore and continue. */ | |
6217 | goto end; | |
6218 | } | |
6219 | ||
6220 | pthread_mutex_lock(&ua_sess->lock); | |
6221 | ||
6222 | if (ua_sess->deleted) { | |
6223 | goto end_unlock; | |
6224 | } | |
6225 | ||
6226 | pthread_mutex_lock(&app->sock_lock); | |
6227 | ret = ustctl_regenerate_statedump(app->sock, ua_sess->handle); | |
6228 | pthread_mutex_unlock(&app->sock_lock); | |
6229 | ||
6230 | end_unlock: | |
6231 | pthread_mutex_unlock(&ua_sess->lock); | |
6232 | ||
6233 | end: | |
6234 | rcu_read_unlock(); | |
6235 | health_code_update(); | |
6236 | return ret; | |
6237 | } | |
6238 | ||
6239 | /* | |
6240 | * Regenerate the statedump for each app in the session. | |
6241 | */ | |
6242 | int ust_app_regenerate_statedump_all(struct ltt_ust_session *usess) | |
6243 | { | |
6244 | int ret = 0; | |
6245 | struct lttng_ht_iter iter; | |
6246 | struct ust_app *app; | |
6247 | ||
6248 | DBG("Regenerating the metadata for all UST apps"); | |
6249 | ||
6250 | rcu_read_lock(); | |
6251 | ||
6252 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6253 | if (!app->compatible) { | |
6254 | continue; | |
6255 | } | |
6256 | ||
6257 | ret = ust_app_regenerate_statedump(usess, app); | |
6258 | if (ret < 0) { | |
6259 | /* Continue to the next app even on error */ | |
6260 | continue; | |
6261 | } | |
6262 | } | |
6263 | ||
6264 | rcu_read_unlock(); | |
6265 | ||
6266 | return 0; | |
6267 | } |