Commit | Line | Data |
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91d76f53 DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * | |
d14d33bf AM |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License, version 2 only, | |
6 | * as published by the Free Software Foundation. | |
91d76f53 DG |
7 | * |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
d14d33bf AM |
13 | * You should have received a copy of the GNU General Public License along |
14 | * with this program; if not, write to the Free Software Foundation, Inc., | |
15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
91d76f53 DG |
16 | */ |
17 | ||
6c1c0768 | 18 | #define _LGPL_SOURCE |
91d76f53 | 19 | #include <errno.h> |
7972aab2 | 20 | #include <inttypes.h> |
91d76f53 DG |
21 | #include <pthread.h> |
22 | #include <stdio.h> | |
23 | #include <stdlib.h> | |
099e26bd | 24 | #include <string.h> |
aba8e916 DG |
25 | #include <sys/stat.h> |
26 | #include <sys/types.h> | |
099e26bd | 27 | #include <unistd.h> |
0df502fd | 28 | #include <urcu/compiler.h> |
fb54cdbf | 29 | #include <lttng/ust-error.h> |
331744e3 | 30 | #include <signal.h> |
bec39940 | 31 | |
990570ed | 32 | #include <common/common.h> |
86acf0da | 33 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 34 | |
7972aab2 | 35 | #include "buffer-registry.h" |
86acf0da | 36 | #include "fd-limit.h" |
8782cc74 | 37 | #include "health-sessiond.h" |
56fff090 | 38 | #include "ust-app.h" |
48842b30 | 39 | #include "ust-consumer.h" |
d80a6244 | 40 | #include "ust-ctl.h" |
0b2dc8df | 41 | #include "utils.h" |
d80a6244 | 42 | |
c4b88406 MD |
43 | static |
44 | int ust_app_flush_app_session(struct ust_app *app, struct ust_app_session *ua_sess); | |
45 | ||
d9bf3ca4 MD |
46 | /* Next available channel key. Access under next_channel_key_lock. */ |
47 | static uint64_t _next_channel_key; | |
48 | static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER; | |
49 | ||
50 | /* Next available session ID. Access under next_session_id_lock. */ | |
51 | static uint64_t _next_session_id; | |
52 | static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER; | |
ffe60014 DG |
53 | |
54 | /* | |
d9bf3ca4 | 55 | * Return the incremented value of next_channel_key. |
ffe60014 | 56 | */ |
d9bf3ca4 | 57 | static uint64_t get_next_channel_key(void) |
ffe60014 | 58 | { |
d9bf3ca4 MD |
59 | uint64_t ret; |
60 | ||
61 | pthread_mutex_lock(&next_channel_key_lock); | |
62 | ret = ++_next_channel_key; | |
63 | pthread_mutex_unlock(&next_channel_key_lock); | |
64 | return ret; | |
ffe60014 DG |
65 | } |
66 | ||
67 | /* | |
7972aab2 | 68 | * Return the atomically incremented value of next_session_id. |
ffe60014 | 69 | */ |
d9bf3ca4 | 70 | static uint64_t get_next_session_id(void) |
ffe60014 | 71 | { |
d9bf3ca4 MD |
72 | uint64_t ret; |
73 | ||
74 | pthread_mutex_lock(&next_session_id_lock); | |
75 | ret = ++_next_session_id; | |
76 | pthread_mutex_unlock(&next_session_id_lock); | |
77 | return ret; | |
ffe60014 DG |
78 | } |
79 | ||
d65d2de8 DG |
80 | static void copy_channel_attr_to_ustctl( |
81 | struct ustctl_consumer_channel_attr *attr, | |
82 | struct lttng_ust_channel_attr *uattr) | |
83 | { | |
84 | /* Copy event attributes since the layout is different. */ | |
85 | attr->subbuf_size = uattr->subbuf_size; | |
86 | attr->num_subbuf = uattr->num_subbuf; | |
87 | attr->overwrite = uattr->overwrite; | |
88 | attr->switch_timer_interval = uattr->switch_timer_interval; | |
89 | attr->read_timer_interval = uattr->read_timer_interval; | |
90 | attr->output = uattr->output; | |
91 | } | |
92 | ||
025faf73 DG |
93 | /* |
94 | * Match function for the hash table lookup. | |
95 | * | |
96 | * It matches an ust app event based on three attributes which are the event | |
97 | * name, the filter bytecode and the loglevel. | |
98 | */ | |
18eace3b DG |
99 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
100 | { | |
101 | struct ust_app_event *event; | |
102 | const struct ust_app_ht_key *key; | |
2106efa0 | 103 | int ev_loglevel_value; |
18eace3b DG |
104 | |
105 | assert(node); | |
106 | assert(_key); | |
107 | ||
108 | event = caa_container_of(node, struct ust_app_event, node.node); | |
109 | key = _key; | |
2106efa0 | 110 | ev_loglevel_value = event->attr.loglevel; |
18eace3b | 111 | |
1af53eb5 | 112 | /* Match the 4 elements of the key: name, filter, loglevel, exclusions */ |
18eace3b DG |
113 | |
114 | /* Event name */ | |
115 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
116 | goto no_match; | |
117 | } | |
118 | ||
119 | /* Event loglevel. */ | |
2106efa0 | 120 | if (ev_loglevel_value != key->loglevel_type) { |
025faf73 | 121 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
2106efa0 PP |
122 | && key->loglevel_type == 0 && |
123 | ev_loglevel_value == -1) { | |
025faf73 DG |
124 | /* |
125 | * Match is accepted. This is because on event creation, the | |
126 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
127 | * -1 are accepted for this loglevel type since 0 is the one set by | |
128 | * the API when receiving an enable event. | |
129 | */ | |
130 | } else { | |
131 | goto no_match; | |
132 | } | |
18eace3b DG |
133 | } |
134 | ||
135 | /* One of the filters is NULL, fail. */ | |
136 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
137 | goto no_match; | |
138 | } | |
139 | ||
025faf73 DG |
140 | if (key->filter && event->filter) { |
141 | /* Both filters exists, check length followed by the bytecode. */ | |
142 | if (event->filter->len != key->filter->len || | |
143 | memcmp(event->filter->data, key->filter->data, | |
144 | event->filter->len) != 0) { | |
145 | goto no_match; | |
146 | } | |
18eace3b DG |
147 | } |
148 | ||
1af53eb5 JI |
149 | /* One of the exclusions is NULL, fail. */ |
150 | if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) { | |
151 | goto no_match; | |
152 | } | |
153 | ||
154 | if (key->exclusion && event->exclusion) { | |
155 | /* Both exclusions exists, check count followed by the names. */ | |
156 | if (event->exclusion->count != key->exclusion->count || | |
157 | memcmp(event->exclusion->names, key->exclusion->names, | |
158 | event->exclusion->count * LTTNG_UST_SYM_NAME_LEN) != 0) { | |
159 | goto no_match; | |
160 | } | |
161 | } | |
162 | ||
163 | ||
025faf73 | 164 | /* Match. */ |
18eace3b DG |
165 | return 1; |
166 | ||
167 | no_match: | |
168 | return 0; | |
18eace3b DG |
169 | } |
170 | ||
025faf73 DG |
171 | /* |
172 | * Unique add of an ust app event in the given ht. This uses the custom | |
173 | * ht_match_ust_app_event match function and the event name as hash. | |
174 | */ | |
d0b96690 | 175 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
176 | struct ust_app_event *event) |
177 | { | |
178 | struct cds_lfht_node *node_ptr; | |
179 | struct ust_app_ht_key key; | |
d0b96690 | 180 | struct lttng_ht *ht; |
18eace3b | 181 | |
d0b96690 DG |
182 | assert(ua_chan); |
183 | assert(ua_chan->events); | |
18eace3b DG |
184 | assert(event); |
185 | ||
d0b96690 | 186 | ht = ua_chan->events; |
18eace3b DG |
187 | key.name = event->attr.name; |
188 | key.filter = event->filter; | |
2106efa0 | 189 | key.loglevel_type = event->attr.loglevel; |
91c89f23 | 190 | key.exclusion = event->exclusion; |
18eace3b DG |
191 | |
192 | node_ptr = cds_lfht_add_unique(ht->ht, | |
193 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
194 | ht_match_ust_app_event, &key, &event->node.node); | |
195 | assert(node_ptr == &event->node.node); | |
196 | } | |
197 | ||
d88aee68 DG |
198 | /* |
199 | * Close the notify socket from the given RCU head object. This MUST be called | |
200 | * through a call_rcu(). | |
201 | */ | |
202 | static void close_notify_sock_rcu(struct rcu_head *head) | |
203 | { | |
204 | int ret; | |
205 | struct ust_app_notify_sock_obj *obj = | |
206 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
207 | ||
208 | /* Must have a valid fd here. */ | |
209 | assert(obj->fd >= 0); | |
210 | ||
211 | ret = close(obj->fd); | |
212 | if (ret) { | |
213 | ERR("close notify sock %d RCU", obj->fd); | |
214 | } | |
215 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
216 | ||
217 | free(obj); | |
218 | } | |
219 | ||
7972aab2 DG |
220 | /* |
221 | * Return the session registry according to the buffer type of the given | |
222 | * session. | |
223 | * | |
224 | * A registry per UID object MUST exists before calling this function or else | |
225 | * it assert() if not found. RCU read side lock must be acquired. | |
226 | */ | |
227 | static struct ust_registry_session *get_session_registry( | |
228 | struct ust_app_session *ua_sess) | |
229 | { | |
230 | struct ust_registry_session *registry = NULL; | |
231 | ||
232 | assert(ua_sess); | |
233 | ||
234 | switch (ua_sess->buffer_type) { | |
235 | case LTTNG_BUFFER_PER_PID: | |
236 | { | |
237 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
238 | if (!reg_pid) { | |
239 | goto error; | |
240 | } | |
241 | registry = reg_pid->registry->reg.ust; | |
242 | break; | |
243 | } | |
244 | case LTTNG_BUFFER_PER_UID: | |
245 | { | |
246 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
247 | ua_sess->tracing_id, ua_sess->bits_per_long, ua_sess->uid); | |
248 | if (!reg_uid) { | |
249 | goto error; | |
250 | } | |
251 | registry = reg_uid->registry->reg.ust; | |
252 | break; | |
253 | } | |
254 | default: | |
255 | assert(0); | |
256 | }; | |
257 | ||
258 | error: | |
259 | return registry; | |
260 | } | |
261 | ||
55cc08a6 DG |
262 | /* |
263 | * Delete ust context safely. RCU read lock must be held before calling | |
264 | * this function. | |
265 | */ | |
266 | static | |
fb45065e MD |
267 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx, |
268 | struct ust_app *app) | |
55cc08a6 | 269 | { |
ffe60014 DG |
270 | int ret; |
271 | ||
272 | assert(ua_ctx); | |
273 | ||
55cc08a6 | 274 | if (ua_ctx->obj) { |
fb45065e | 275 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 276 | ret = ustctl_release_object(sock, ua_ctx->obj); |
fb45065e | 277 | pthread_mutex_unlock(&app->sock_lock); |
d0b96690 DG |
278 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
279 | ERR("UST app sock %d release ctx obj handle %d failed with ret %d", | |
280 | sock, ua_ctx->obj->handle, ret); | |
ffe60014 | 281 | } |
55cc08a6 DG |
282 | free(ua_ctx->obj); |
283 | } | |
284 | free(ua_ctx); | |
285 | } | |
286 | ||
d80a6244 DG |
287 | /* |
288 | * Delete ust app event safely. RCU read lock must be held before calling | |
289 | * this function. | |
290 | */ | |
8b366481 | 291 | static |
fb45065e MD |
292 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event, |
293 | struct ust_app *app) | |
d80a6244 | 294 | { |
ffe60014 DG |
295 | int ret; |
296 | ||
297 | assert(ua_event); | |
298 | ||
53a80697 | 299 | free(ua_event->filter); |
951f0b71 JI |
300 | if (ua_event->exclusion != NULL) |
301 | free(ua_event->exclusion); | |
edb67388 | 302 | if (ua_event->obj != NULL) { |
fb45065e | 303 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 304 | ret = ustctl_release_object(sock, ua_event->obj); |
fb45065e | 305 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
306 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
307 | ERR("UST app sock %d release event obj failed with ret %d", | |
308 | sock, ret); | |
309 | } | |
edb67388 DG |
310 | free(ua_event->obj); |
311 | } | |
d80a6244 DG |
312 | free(ua_event); |
313 | } | |
314 | ||
315 | /* | |
7972aab2 DG |
316 | * Release ust data object of the given stream. |
317 | * | |
318 | * Return 0 on success or else a negative value. | |
d80a6244 | 319 | */ |
fb45065e MD |
320 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream, |
321 | struct ust_app *app) | |
d80a6244 | 322 | { |
7972aab2 | 323 | int ret = 0; |
ffe60014 DG |
324 | |
325 | assert(stream); | |
326 | ||
8b366481 | 327 | if (stream->obj) { |
fb45065e | 328 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 329 | ret = ustctl_release_object(sock, stream->obj); |
fb45065e | 330 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
331 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
332 | ERR("UST app sock %d release stream obj failed with ret %d", | |
333 | sock, ret); | |
334 | } | |
4063050c | 335 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
336 | free(stream->obj); |
337 | } | |
7972aab2 DG |
338 | |
339 | return ret; | |
340 | } | |
341 | ||
342 | /* | |
343 | * Delete ust app stream safely. RCU read lock must be held before calling | |
344 | * this function. | |
345 | */ | |
346 | static | |
fb45065e MD |
347 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream, |
348 | struct ust_app *app) | |
7972aab2 DG |
349 | { |
350 | assert(stream); | |
351 | ||
fb45065e | 352 | (void) release_ust_app_stream(sock, stream, app); |
84cd17c6 | 353 | free(stream); |
d80a6244 DG |
354 | } |
355 | ||
36b588ed MD |
356 | /* |
357 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
358 | * section and outside of call_rcu thread, so we postpone its execution |
359 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
360 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
361 | */ |
362 | static | |
363 | void delete_ust_app_channel_rcu(struct rcu_head *head) | |
364 | { | |
365 | struct ust_app_channel *ua_chan = | |
366 | caa_container_of(head, struct ust_app_channel, rcu_head); | |
367 | ||
0b2dc8df MD |
368 | ht_cleanup_push(ua_chan->ctx); |
369 | ht_cleanup_push(ua_chan->events); | |
36b588ed MD |
370 | free(ua_chan); |
371 | } | |
372 | ||
d80a6244 DG |
373 | /* |
374 | * Delete ust app channel safely. RCU read lock must be held before calling | |
375 | * this function. | |
376 | */ | |
8b366481 | 377 | static |
d0b96690 DG |
378 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
379 | struct ust_app *app) | |
d80a6244 DG |
380 | { |
381 | int ret; | |
bec39940 | 382 | struct lttng_ht_iter iter; |
d80a6244 | 383 | struct ust_app_event *ua_event; |
55cc08a6 | 384 | struct ust_app_ctx *ua_ctx; |
030a66fa | 385 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 386 | struct ust_registry_session *registry; |
d80a6244 | 387 | |
ffe60014 DG |
388 | assert(ua_chan); |
389 | ||
390 | DBG3("UST app deleting channel %s", ua_chan->name); | |
391 | ||
55cc08a6 | 392 | /* Wipe stream */ |
d80a6244 | 393 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 394 | cds_list_del(&stream->list); |
fb45065e | 395 | delete_ust_app_stream(sock, stream, app); |
d80a6244 DG |
396 | } |
397 | ||
55cc08a6 | 398 | /* Wipe context */ |
bec39940 | 399 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
31746f93 | 400 | cds_list_del(&ua_ctx->list); |
bec39940 | 401 | ret = lttng_ht_del(ua_chan->ctx, &iter); |
55cc08a6 | 402 | assert(!ret); |
fb45065e | 403 | delete_ust_app_ctx(sock, ua_ctx, app); |
55cc08a6 | 404 | } |
d80a6244 | 405 | |
55cc08a6 | 406 | /* Wipe events */ |
bec39940 DG |
407 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
408 | node.node) { | |
409 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 410 | assert(!ret); |
fb45065e | 411 | delete_ust_app_event(sock, ua_event, app); |
d80a6244 | 412 | } |
edb67388 | 413 | |
c8335706 MD |
414 | if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) { |
415 | /* Wipe and free registry from session registry. */ | |
416 | registry = get_session_registry(ua_chan->session); | |
417 | if (registry) { | |
418 | ust_registry_channel_del_free(registry, ua_chan->key); | |
419 | } | |
7972aab2 | 420 | } |
d0b96690 | 421 | |
edb67388 | 422 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
423 | /* Remove channel from application UST object descriptor. */ |
424 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
c6e62271 DG |
425 | ret = lttng_ht_del(app->ust_objd, &iter); |
426 | assert(!ret); | |
fb45065e | 427 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 428 | ret = ustctl_release_object(sock, ua_chan->obj); |
fb45065e | 429 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
430 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
431 | ERR("UST app sock %d release channel obj failed with ret %d", | |
432 | sock, ret); | |
433 | } | |
7972aab2 | 434 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
435 | free(ua_chan->obj); |
436 | } | |
36b588ed | 437 | call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); |
d80a6244 DG |
438 | } |
439 | ||
fb45065e MD |
440 | int ust_app_register_done(struct ust_app *app) |
441 | { | |
442 | int ret; | |
443 | ||
444 | pthread_mutex_lock(&app->sock_lock); | |
445 | ret = ustctl_register_done(app->sock); | |
446 | pthread_mutex_unlock(&app->sock_lock); | |
447 | return ret; | |
448 | } | |
449 | ||
450 | int ust_app_release_object(struct ust_app *app, struct lttng_ust_object_data *data) | |
451 | { | |
452 | int ret, sock; | |
453 | ||
454 | if (app) { | |
455 | pthread_mutex_lock(&app->sock_lock); | |
456 | sock = app->sock; | |
457 | } else { | |
458 | sock = -1; | |
459 | } | |
460 | ret = ustctl_release_object(sock, data); | |
461 | if (app) { | |
462 | pthread_mutex_unlock(&app->sock_lock); | |
463 | } | |
464 | return ret; | |
465 | } | |
466 | ||
331744e3 | 467 | /* |
1b532a60 DG |
468 | * Push metadata to consumer socket. |
469 | * | |
dc2bbdae MD |
470 | * RCU read-side lock must be held to guarantee existance of socket. |
471 | * Must be called with the ust app session lock held. | |
472 | * Must be called with the registry lock held. | |
331744e3 JD |
473 | * |
474 | * On success, return the len of metadata pushed or else a negative value. | |
2c57e06d MD |
475 | * Returning a -EPIPE return value means we could not send the metadata, |
476 | * but it can be caused by recoverable errors (e.g. the application has | |
477 | * terminated concurrently). | |
331744e3 JD |
478 | */ |
479 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
480 | struct consumer_socket *socket, int send_zero_data) | |
481 | { | |
482 | int ret; | |
483 | char *metadata_str = NULL; | |
c585821b | 484 | size_t len, offset, new_metadata_len_sent; |
331744e3 | 485 | ssize_t ret_val; |
c585821b | 486 | uint64_t metadata_key; |
331744e3 JD |
487 | |
488 | assert(registry); | |
489 | assert(socket); | |
1b532a60 | 490 | |
c585821b MD |
491 | metadata_key = registry->metadata_key; |
492 | ||
ce34fcd0 | 493 | /* |
dc2bbdae MD |
494 | * Means that no metadata was assigned to the session. This can |
495 | * happens if no start has been done previously. | |
ce34fcd0 | 496 | */ |
c585821b | 497 | if (!metadata_key) { |
ce34fcd0 MD |
498 | return 0; |
499 | } | |
500 | ||
1b532a60 | 501 | /* |
dc2bbdae MD |
502 | * On a push metadata error either the consumer is dead or the |
503 | * metadata channel has been destroyed because its endpoint | |
2c57e06d MD |
504 | * might have died (e.g: relayd), or because the application has |
505 | * exited. If so, the metadata closed flag is set to 1 so we | |
506 | * deny pushing metadata again which is not valid anymore on the | |
507 | * consumer side. | |
1b532a60 DG |
508 | */ |
509 | if (registry->metadata_closed) { | |
510 | return -EPIPE; | |
511 | } | |
331744e3 | 512 | |
331744e3 JD |
513 | offset = registry->metadata_len_sent; |
514 | len = registry->metadata_len - registry->metadata_len_sent; | |
c585821b | 515 | new_metadata_len_sent = registry->metadata_len; |
331744e3 JD |
516 | if (len == 0) { |
517 | DBG3("No metadata to push for metadata key %" PRIu64, | |
518 | registry->metadata_key); | |
519 | ret_val = len; | |
520 | if (send_zero_data) { | |
521 | DBG("No metadata to push"); | |
522 | goto push_data; | |
523 | } | |
524 | goto end; | |
525 | } | |
526 | ||
527 | /* Allocate only what we have to send. */ | |
528 | metadata_str = zmalloc(len); | |
529 | if (!metadata_str) { | |
530 | PERROR("zmalloc ust app metadata string"); | |
531 | ret_val = -ENOMEM; | |
532 | goto error; | |
533 | } | |
c585821b | 534 | /* Copy what we haven't sent out. */ |
331744e3 | 535 | memcpy(metadata_str, registry->metadata + offset, len); |
331744e3 JD |
536 | |
537 | push_data: | |
c585821b MD |
538 | pthread_mutex_unlock(®istry->lock); |
539 | /* | |
540 | * We need to unlock the registry while we push metadata to | |
541 | * break a circular dependency between the consumerd metadata | |
542 | * lock and the sessiond registry lock. Indeed, pushing metadata | |
543 | * to the consumerd awaits that it gets pushed all the way to | |
544 | * relayd, but doing so requires grabbing the metadata lock. If | |
545 | * a concurrent metadata request is being performed by | |
546 | * consumerd, this can try to grab the registry lock on the | |
547 | * sessiond while holding the metadata lock on the consumer | |
548 | * daemon. Those push and pull schemes are performed on two | |
549 | * different bidirectionnal communication sockets. | |
550 | */ | |
551 | ret = consumer_push_metadata(socket, metadata_key, | |
331744e3 | 552 | metadata_str, len, offset); |
c585821b | 553 | pthread_mutex_lock(®istry->lock); |
331744e3 | 554 | if (ret < 0) { |
000baf6a | 555 | /* |
dc2bbdae MD |
556 | * There is an acceptable race here between the registry |
557 | * metadata key assignment and the creation on the | |
558 | * consumer. The session daemon can concurrently push | |
559 | * metadata for this registry while being created on the | |
560 | * consumer since the metadata key of the registry is | |
561 | * assigned *before* it is setup to avoid the consumer | |
562 | * to ask for metadata that could possibly be not found | |
563 | * in the session daemon. | |
000baf6a | 564 | * |
dc2bbdae MD |
565 | * The metadata will get pushed either by the session |
566 | * being stopped or the consumer requesting metadata if | |
567 | * that race is triggered. | |
000baf6a DG |
568 | */ |
569 | if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) { | |
570 | ret = 0; | |
c585821b MD |
571 | } else { |
572 | ERR("Error pushing metadata to consumer"); | |
000baf6a | 573 | } |
331744e3 JD |
574 | ret_val = ret; |
575 | goto error_push; | |
c585821b MD |
576 | } else { |
577 | /* | |
578 | * Metadata may have been concurrently pushed, since | |
579 | * we're not holding the registry lock while pushing to | |
580 | * consumer. This is handled by the fact that we send | |
581 | * the metadata content, size, and the offset at which | |
582 | * that metadata belongs. This may arrive out of order | |
583 | * on the consumer side, and the consumer is able to | |
584 | * deal with overlapping fragments. The consumer | |
585 | * supports overlapping fragments, which must be | |
586 | * contiguous starting from offset 0. We keep the | |
587 | * largest metadata_len_sent value of the concurrent | |
588 | * send. | |
589 | */ | |
590 | registry->metadata_len_sent = | |
591 | max_t(size_t, registry->metadata_len_sent, | |
592 | new_metadata_len_sent); | |
331744e3 | 593 | } |
331744e3 JD |
594 | free(metadata_str); |
595 | return len; | |
596 | ||
597 | end: | |
598 | error: | |
ce34fcd0 MD |
599 | if (ret_val) { |
600 | /* | |
dc2bbdae MD |
601 | * On error, flag the registry that the metadata is |
602 | * closed. We were unable to push anything and this | |
603 | * means that either the consumer is not responding or | |
604 | * the metadata cache has been destroyed on the | |
605 | * consumer. | |
ce34fcd0 MD |
606 | */ |
607 | registry->metadata_closed = 1; | |
608 | } | |
331744e3 JD |
609 | error_push: |
610 | free(metadata_str); | |
611 | return ret_val; | |
612 | } | |
613 | ||
d88aee68 | 614 | /* |
ce34fcd0 | 615 | * For a given application and session, push metadata to consumer. |
331744e3 JD |
616 | * Either sock or consumer is required : if sock is NULL, the default |
617 | * socket to send the metadata is retrieved from consumer, if sock | |
618 | * is not NULL we use it to send the metadata. | |
ce34fcd0 | 619 | * RCU read-side lock must be held while calling this function, |
dc2bbdae MD |
620 | * therefore ensuring existance of registry. It also ensures existance |
621 | * of socket throughout this function. | |
d88aee68 DG |
622 | * |
623 | * Return 0 on success else a negative error. | |
2c57e06d MD |
624 | * Returning a -EPIPE return value means we could not send the metadata, |
625 | * but it can be caused by recoverable errors (e.g. the application has | |
626 | * terminated concurrently). | |
d88aee68 | 627 | */ |
7972aab2 DG |
628 | static int push_metadata(struct ust_registry_session *registry, |
629 | struct consumer_output *consumer) | |
d88aee68 | 630 | { |
331744e3 JD |
631 | int ret_val; |
632 | ssize_t ret; | |
d88aee68 DG |
633 | struct consumer_socket *socket; |
634 | ||
7972aab2 DG |
635 | assert(registry); |
636 | assert(consumer); | |
637 | ||
ce34fcd0 | 638 | pthread_mutex_lock(®istry->lock); |
ce34fcd0 | 639 | if (registry->metadata_closed) { |
dc2bbdae MD |
640 | ret_val = -EPIPE; |
641 | goto error; | |
d88aee68 DG |
642 | } |
643 | ||
d88aee68 | 644 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
645 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
646 | consumer); | |
d88aee68 | 647 | if (!socket) { |
331744e3 | 648 | ret_val = -1; |
ce34fcd0 | 649 | goto error; |
d88aee68 DG |
650 | } |
651 | ||
331744e3 | 652 | ret = ust_app_push_metadata(registry, socket, 0); |
d88aee68 | 653 | if (ret < 0) { |
331744e3 | 654 | ret_val = ret; |
ce34fcd0 | 655 | goto error; |
d88aee68 | 656 | } |
dc2bbdae | 657 | pthread_mutex_unlock(®istry->lock); |
d88aee68 DG |
658 | return 0; |
659 | ||
ce34fcd0 | 660 | error: |
dc2bbdae | 661 | pthread_mutex_unlock(®istry->lock); |
331744e3 | 662 | return ret_val; |
d88aee68 DG |
663 | } |
664 | ||
665 | /* | |
666 | * Send to the consumer a close metadata command for the given session. Once | |
667 | * done, the metadata channel is deleted and the session metadata pointer is | |
dc2bbdae | 668 | * nullified. The session lock MUST be held unless the application is |
d88aee68 DG |
669 | * in the destroy path. |
670 | * | |
671 | * Return 0 on success else a negative value. | |
672 | */ | |
7972aab2 DG |
673 | static int close_metadata(struct ust_registry_session *registry, |
674 | struct consumer_output *consumer) | |
d88aee68 DG |
675 | { |
676 | int ret; | |
677 | struct consumer_socket *socket; | |
678 | ||
7972aab2 DG |
679 | assert(registry); |
680 | assert(consumer); | |
d88aee68 | 681 | |
7972aab2 DG |
682 | rcu_read_lock(); |
683 | ||
ce34fcd0 MD |
684 | pthread_mutex_lock(®istry->lock); |
685 | ||
7972aab2 | 686 | if (!registry->metadata_key || registry->metadata_closed) { |
d88aee68 | 687 | ret = 0; |
1b532a60 | 688 | goto end; |
d88aee68 DG |
689 | } |
690 | ||
d88aee68 | 691 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
692 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
693 | consumer); | |
d88aee68 DG |
694 | if (!socket) { |
695 | ret = -1; | |
7972aab2 | 696 | goto error; |
d88aee68 DG |
697 | } |
698 | ||
7972aab2 | 699 | ret = consumer_close_metadata(socket, registry->metadata_key); |
d88aee68 | 700 | if (ret < 0) { |
7972aab2 | 701 | goto error; |
d88aee68 DG |
702 | } |
703 | ||
d88aee68 | 704 | error: |
1b532a60 DG |
705 | /* |
706 | * Metadata closed. Even on error this means that the consumer is not | |
707 | * responding or not found so either way a second close should NOT be emit | |
708 | * for this registry. | |
709 | */ | |
710 | registry->metadata_closed = 1; | |
711 | end: | |
ce34fcd0 | 712 | pthread_mutex_unlock(®istry->lock); |
7972aab2 | 713 | rcu_read_unlock(); |
d88aee68 DG |
714 | return ret; |
715 | } | |
716 | ||
36b588ed MD |
717 | /* |
718 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
719 | * section and outside of call_rcu thread, so we postpone its execution |
720 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
721 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
722 | */ |
723 | static | |
724 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
725 | { | |
726 | struct ust_app_session *ua_sess = | |
727 | caa_container_of(head, struct ust_app_session, rcu_head); | |
728 | ||
0b2dc8df | 729 | ht_cleanup_push(ua_sess->channels); |
36b588ed MD |
730 | free(ua_sess); |
731 | } | |
732 | ||
d80a6244 DG |
733 | /* |
734 | * Delete ust app session safely. RCU read lock must be held before calling | |
735 | * this function. | |
736 | */ | |
8b366481 | 737 | static |
d0b96690 DG |
738 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
739 | struct ust_app *app) | |
d80a6244 DG |
740 | { |
741 | int ret; | |
bec39940 | 742 | struct lttng_ht_iter iter; |
d80a6244 | 743 | struct ust_app_channel *ua_chan; |
7972aab2 | 744 | struct ust_registry_session *registry; |
d80a6244 | 745 | |
d88aee68 DG |
746 | assert(ua_sess); |
747 | ||
1b532a60 DG |
748 | pthread_mutex_lock(&ua_sess->lock); |
749 | ||
b161602a MD |
750 | assert(!ua_sess->deleted); |
751 | ua_sess->deleted = true; | |
752 | ||
7972aab2 | 753 | registry = get_session_registry(ua_sess); |
ce34fcd0 | 754 | if (registry) { |
d88aee68 | 755 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 756 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 757 | |
7972aab2 DG |
758 | /* |
759 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
760 | * metadata only on destroy trace session in this case. Also, the |
761 | * previous push metadata could have flag the metadata registry to | |
762 | * close so don't send a close command if closed. | |
7972aab2 | 763 | */ |
ce34fcd0 | 764 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
765 | /* And ask to close it for this session registry. */ |
766 | (void) close_metadata(registry, ua_sess->consumer); | |
767 | } | |
d80a6244 DG |
768 | } |
769 | ||
bec39940 DG |
770 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
771 | node.node) { | |
772 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 773 | assert(!ret); |
d0b96690 | 774 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 775 | } |
d80a6244 | 776 | |
7972aab2 DG |
777 | /* In case of per PID, the registry is kept in the session. */ |
778 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
779 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
780 | if (reg_pid) { | |
781 | buffer_reg_pid_remove(reg_pid); | |
782 | buffer_reg_pid_destroy(reg_pid); | |
783 | } | |
784 | } | |
d0b96690 | 785 | |
aee6bafd | 786 | if (ua_sess->handle != -1) { |
fb45065e | 787 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 788 | ret = ustctl_release_handle(sock, ua_sess->handle); |
fb45065e | 789 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
790 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
791 | ERR("UST app sock %d release session handle failed with ret %d", | |
792 | sock, ret); | |
793 | } | |
10b56aef MD |
794 | /* Remove session from application UST object descriptor. */ |
795 | iter.iter.node = &ua_sess->ust_objd_node.node; | |
796 | ret = lttng_ht_del(app->ust_sessions_objd, &iter); | |
797 | assert(!ret); | |
aee6bafd | 798 | } |
10b56aef | 799 | |
1b532a60 DG |
800 | pthread_mutex_unlock(&ua_sess->lock); |
801 | ||
6addfa37 MD |
802 | consumer_output_put(ua_sess->consumer); |
803 | ||
36b588ed | 804 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 805 | } |
91d76f53 DG |
806 | |
807 | /* | |
284d8f55 DG |
808 | * Delete a traceable application structure from the global list. Never call |
809 | * this function outside of a call_rcu call. | |
36b588ed MD |
810 | * |
811 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 812 | */ |
8b366481 DG |
813 | static |
814 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 815 | { |
8b366481 | 816 | int ret, sock; |
d42f20df | 817 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 818 | |
d80a6244 | 819 | /* Delete ust app sessions info */ |
852d0037 DG |
820 | sock = app->sock; |
821 | app->sock = -1; | |
d80a6244 | 822 | |
8b366481 | 823 | /* Wipe sessions */ |
d42f20df DG |
824 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
825 | teardown_node) { | |
826 | /* Free every object in the session and the session. */ | |
36b588ed | 827 | rcu_read_lock(); |
d0b96690 | 828 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 829 | rcu_read_unlock(); |
d80a6244 | 830 | } |
36b588ed | 831 | |
0b2dc8df | 832 | ht_cleanup_push(app->sessions); |
10b56aef | 833 | ht_cleanup_push(app->ust_sessions_objd); |
0b2dc8df | 834 | ht_cleanup_push(app->ust_objd); |
d80a6244 | 835 | |
6414a713 | 836 | /* |
852d0037 DG |
837 | * Wait until we have deleted the application from the sock hash table |
838 | * before closing this socket, otherwise an application could re-use the | |
839 | * socket ID and race with the teardown, using the same hash table entry. | |
840 | * | |
841 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
842 | * all RCU readers that could run concurrently with unregister app, | |
843 | * therefore we _need_ to only close that socket after a grace period. So | |
844 | * it should stay in this RCU callback. | |
845 | * | |
846 | * This close() is a very important step of the synchronization model so | |
847 | * every modification to this function must be carefully reviewed. | |
6414a713 | 848 | */ |
799e2c4f MD |
849 | ret = close(sock); |
850 | if (ret) { | |
851 | PERROR("close"); | |
852 | } | |
4063050c | 853 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 854 | |
852d0037 | 855 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 856 | free(app); |
099e26bd DG |
857 | } |
858 | ||
859 | /* | |
f6a9efaa | 860 | * URCU intermediate call to delete an UST app. |
099e26bd | 861 | */ |
8b366481 DG |
862 | static |
863 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 864 | { |
bec39940 DG |
865 | struct lttng_ht_node_ulong *node = |
866 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 867 | struct ust_app *app = |
852d0037 | 868 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 869 | |
852d0037 | 870 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 871 | delete_ust_app(app); |
099e26bd DG |
872 | } |
873 | ||
ffe60014 DG |
874 | /* |
875 | * Delete the session from the application ht and delete the data structure by | |
876 | * freeing every object inside and releasing them. | |
877 | */ | |
d0b96690 | 878 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
879 | struct ust_app_session *ua_sess) |
880 | { | |
881 | int ret; | |
882 | struct lttng_ht_iter iter; | |
883 | ||
884 | assert(app); | |
885 | assert(ua_sess); | |
886 | ||
887 | iter.iter.node = &ua_sess->node.node; | |
888 | ret = lttng_ht_del(app->sessions, &iter); | |
889 | if (ret) { | |
890 | /* Already scheduled for teardown. */ | |
891 | goto end; | |
892 | } | |
893 | ||
894 | /* Once deleted, free the data structure. */ | |
d0b96690 | 895 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
896 | |
897 | end: | |
898 | return; | |
899 | } | |
900 | ||
8b366481 DG |
901 | /* |
902 | * Alloc new UST app session. | |
903 | */ | |
904 | static | |
d0b96690 | 905 | struct ust_app_session *alloc_ust_app_session(struct ust_app *app) |
8b366481 DG |
906 | { |
907 | struct ust_app_session *ua_sess; | |
908 | ||
909 | /* Init most of the default value by allocating and zeroing */ | |
910 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
911 | if (ua_sess == NULL) { | |
912 | PERROR("malloc"); | |
ffe60014 | 913 | goto error_free; |
8b366481 DG |
914 | } |
915 | ||
916 | ua_sess->handle = -1; | |
bec39940 | 917 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
ad7a9107 | 918 | ua_sess->metadata_attr.type = LTTNG_UST_CHAN_METADATA; |
84ad93e8 | 919 | pthread_mutex_init(&ua_sess->lock, NULL); |
ad7a9107 | 920 | |
8b366481 DG |
921 | return ua_sess; |
922 | ||
ffe60014 | 923 | error_free: |
8b366481 DG |
924 | return NULL; |
925 | } | |
926 | ||
927 | /* | |
928 | * Alloc new UST app channel. | |
929 | */ | |
930 | static | |
931 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 932 | struct ust_app_session *ua_sess, |
ffe60014 | 933 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
934 | { |
935 | struct ust_app_channel *ua_chan; | |
936 | ||
937 | /* Init most of the default value by allocating and zeroing */ | |
938 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
939 | if (ua_chan == NULL) { | |
940 | PERROR("malloc"); | |
941 | goto error; | |
942 | } | |
943 | ||
944 | /* Setup channel name */ | |
945 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
946 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
947 | ||
948 | ua_chan->enabled = 1; | |
949 | ua_chan->handle = -1; | |
45893984 | 950 | ua_chan->session = ua_sess; |
ffe60014 | 951 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
952 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
953 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
954 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
955 | |
956 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
31746f93 | 957 | CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); |
8b366481 DG |
958 | |
959 | /* Copy attributes */ | |
960 | if (attr) { | |
ffe60014 | 961 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
962 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
963 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
964 | ua_chan->attr.overwrite = attr->overwrite; | |
965 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
966 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
967 | ua_chan->attr.output = attr->output; | |
8b366481 | 968 | } |
ffe60014 DG |
969 | /* By default, the channel is a per cpu channel. */ |
970 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
971 | |
972 | DBG3("UST app channel %s allocated", ua_chan->name); | |
973 | ||
974 | return ua_chan; | |
975 | ||
976 | error: | |
977 | return NULL; | |
978 | } | |
979 | ||
37f1c236 DG |
980 | /* |
981 | * Allocate and initialize a UST app stream. | |
982 | * | |
983 | * Return newly allocated stream pointer or NULL on error. | |
984 | */ | |
ffe60014 | 985 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
986 | { |
987 | struct ust_app_stream *stream = NULL; | |
988 | ||
989 | stream = zmalloc(sizeof(*stream)); | |
990 | if (stream == NULL) { | |
991 | PERROR("zmalloc ust app stream"); | |
992 | goto error; | |
993 | } | |
994 | ||
995 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
996 | stream->handle = -1; | |
997 | ||
998 | error: | |
999 | return stream; | |
1000 | } | |
1001 | ||
8b366481 DG |
1002 | /* |
1003 | * Alloc new UST app event. | |
1004 | */ | |
1005 | static | |
1006 | struct ust_app_event *alloc_ust_app_event(char *name, | |
1007 | struct lttng_ust_event *attr) | |
1008 | { | |
1009 | struct ust_app_event *ua_event; | |
1010 | ||
1011 | /* Init most of the default value by allocating and zeroing */ | |
1012 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
1013 | if (ua_event == NULL) { | |
1014 | PERROR("malloc"); | |
1015 | goto error; | |
1016 | } | |
1017 | ||
1018 | ua_event->enabled = 1; | |
1019 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
1020 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 1021 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
1022 | |
1023 | /* Copy attributes */ | |
1024 | if (attr) { | |
1025 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
1026 | } | |
1027 | ||
1028 | DBG3("UST app event %s allocated", ua_event->name); | |
1029 | ||
1030 | return ua_event; | |
1031 | ||
1032 | error: | |
1033 | return NULL; | |
1034 | } | |
1035 | ||
1036 | /* | |
1037 | * Alloc new UST app context. | |
1038 | */ | |
1039 | static | |
1040 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx) | |
1041 | { | |
1042 | struct ust_app_ctx *ua_ctx; | |
1043 | ||
1044 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
1045 | if (ua_ctx == NULL) { | |
1046 | goto error; | |
1047 | } | |
1048 | ||
31746f93 DG |
1049 | CDS_INIT_LIST_HEAD(&ua_ctx->list); |
1050 | ||
8b366481 DG |
1051 | if (uctx) { |
1052 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
1053 | } | |
1054 | ||
1055 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
1056 | ||
1057 | error: | |
1058 | return ua_ctx; | |
1059 | } | |
1060 | ||
025faf73 DG |
1061 | /* |
1062 | * Allocate a filter and copy the given original filter. | |
1063 | * | |
1064 | * Return allocated filter or NULL on error. | |
1065 | */ | |
51755dc8 JG |
1066 | static struct lttng_filter_bytecode *copy_filter_bytecode( |
1067 | struct lttng_filter_bytecode *orig_f) | |
025faf73 | 1068 | { |
51755dc8 | 1069 | struct lttng_filter_bytecode *filter = NULL; |
025faf73 DG |
1070 | |
1071 | /* Copy filter bytecode */ | |
1072 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
1073 | if (!filter) { | |
51755dc8 | 1074 | PERROR("zmalloc alloc filter bytecode"); |
025faf73 DG |
1075 | goto error; |
1076 | } | |
1077 | ||
1078 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
1079 | ||
1080 | error: | |
1081 | return filter; | |
1082 | } | |
1083 | ||
51755dc8 JG |
1084 | /* |
1085 | * Create a liblttng-ust filter bytecode from given bytecode. | |
1086 | * | |
1087 | * Return allocated filter or NULL on error. | |
1088 | */ | |
1089 | static struct lttng_ust_filter_bytecode *create_ust_bytecode_from_bytecode( | |
1090 | struct lttng_filter_bytecode *orig_f) | |
1091 | { | |
1092 | struct lttng_ust_filter_bytecode *filter = NULL; | |
1093 | ||
1094 | /* Copy filter bytecode */ | |
1095 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
1096 | if (!filter) { | |
1097 | PERROR("zmalloc alloc ust filter bytecode"); | |
1098 | goto error; | |
1099 | } | |
1100 | ||
1101 | assert(sizeof(struct lttng_filter_bytecode) == | |
1102 | sizeof(struct lttng_ust_filter_bytecode)); | |
1103 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
1104 | error: | |
1105 | return filter; | |
1106 | } | |
1107 | ||
099e26bd | 1108 | /* |
421cb601 DG |
1109 | * Find an ust_app using the sock and return it. RCU read side lock must be |
1110 | * held before calling this helper function. | |
099e26bd | 1111 | */ |
f20baf8e | 1112 | struct ust_app *ust_app_find_by_sock(int sock) |
099e26bd | 1113 | { |
bec39940 | 1114 | struct lttng_ht_node_ulong *node; |
bec39940 | 1115 | struct lttng_ht_iter iter; |
f6a9efaa | 1116 | |
852d0037 | 1117 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 1118 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
1119 | if (node == NULL) { |
1120 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
1121 | goto error; |
1122 | } | |
852d0037 DG |
1123 | |
1124 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
1125 | |
1126 | error: | |
1127 | return NULL; | |
099e26bd DG |
1128 | } |
1129 | ||
d0b96690 DG |
1130 | /* |
1131 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
1132 | * be held before calling this helper function. | |
1133 | */ | |
1134 | static struct ust_app *find_app_by_notify_sock(int sock) | |
1135 | { | |
1136 | struct lttng_ht_node_ulong *node; | |
1137 | struct lttng_ht_iter iter; | |
1138 | ||
1139 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
1140 | &iter); | |
1141 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1142 | if (node == NULL) { | |
1143 | DBG2("UST app find by notify sock %d not found", sock); | |
1144 | goto error; | |
1145 | } | |
1146 | ||
1147 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
1148 | ||
1149 | error: | |
1150 | return NULL; | |
1151 | } | |
1152 | ||
025faf73 DG |
1153 | /* |
1154 | * Lookup for an ust app event based on event name, filter bytecode and the | |
1155 | * event loglevel. | |
1156 | * | |
1157 | * Return an ust_app_event object or NULL on error. | |
1158 | */ | |
18eace3b | 1159 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
2106efa0 PP |
1160 | char *name, struct lttng_filter_bytecode *filter, |
1161 | int loglevel_value, | |
39c5a3a7 | 1162 | const struct lttng_event_exclusion *exclusion) |
18eace3b DG |
1163 | { |
1164 | struct lttng_ht_iter iter; | |
1165 | struct lttng_ht_node_str *node; | |
1166 | struct ust_app_event *event = NULL; | |
1167 | struct ust_app_ht_key key; | |
18eace3b DG |
1168 | |
1169 | assert(name); | |
1170 | assert(ht); | |
1171 | ||
1172 | /* Setup key for event lookup. */ | |
1173 | key.name = name; | |
1174 | key.filter = filter; | |
2106efa0 | 1175 | key.loglevel_type = loglevel_value; |
39c5a3a7 | 1176 | /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */ |
51755dc8 | 1177 | key.exclusion = exclusion; |
18eace3b | 1178 | |
025faf73 DG |
1179 | /* Lookup using the event name as hash and a custom match fct. */ |
1180 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1181 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1182 | node = lttng_ht_iter_get_node_str(&iter); |
1183 | if (node == NULL) { | |
1184 | goto end; | |
1185 | } | |
1186 | ||
1187 | event = caa_container_of(node, struct ust_app_event, node); | |
1188 | ||
1189 | end: | |
18eace3b DG |
1190 | return event; |
1191 | } | |
1192 | ||
55cc08a6 DG |
1193 | /* |
1194 | * Create the channel context on the tracer. | |
d0b96690 DG |
1195 | * |
1196 | * Called with UST app session lock held. | |
55cc08a6 DG |
1197 | */ |
1198 | static | |
1199 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1200 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1201 | { | |
1202 | int ret; | |
1203 | ||
840cb59c | 1204 | health_code_update(); |
86acf0da | 1205 | |
fb45065e | 1206 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1207 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 | 1208 | ua_chan->obj, &ua_ctx->obj); |
fb45065e | 1209 | pthread_mutex_unlock(&app->sock_lock); |
55cc08a6 | 1210 | if (ret < 0) { |
ffe60014 DG |
1211 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1212 | ERR("UST app create channel context failed for app (pid: %d) " | |
1213 | "with ret %d", app->pid, ret); | |
1214 | } else { | |
3757b385 DG |
1215 | /* |
1216 | * This is normal behavior, an application can die during the | |
1217 | * creation process. Don't report an error so the execution can | |
1218 | * continue normally. | |
1219 | */ | |
1220 | ret = 0; | |
ffe60014 DG |
1221 | DBG3("UST app disable event failed. Application is dead."); |
1222 | } | |
55cc08a6 DG |
1223 | goto error; |
1224 | } | |
1225 | ||
1226 | ua_ctx->handle = ua_ctx->obj->handle; | |
1227 | ||
d0b96690 DG |
1228 | DBG2("UST app context handle %d created successfully for channel %s", |
1229 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1230 | |
1231 | error: | |
840cb59c | 1232 | health_code_update(); |
55cc08a6 DG |
1233 | return ret; |
1234 | } | |
1235 | ||
53a80697 MD |
1236 | /* |
1237 | * Set the filter on the tracer. | |
1238 | */ | |
1239 | static | |
1240 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
1241 | struct ust_app *app) | |
1242 | { | |
1243 | int ret; | |
51755dc8 | 1244 | struct lttng_ust_filter_bytecode *ust_bytecode = NULL; |
53a80697 | 1245 | |
840cb59c | 1246 | health_code_update(); |
86acf0da | 1247 | |
53a80697 | 1248 | if (!ua_event->filter) { |
86acf0da DG |
1249 | ret = 0; |
1250 | goto error; | |
53a80697 MD |
1251 | } |
1252 | ||
51755dc8 JG |
1253 | ust_bytecode = create_ust_bytecode_from_bytecode(ua_event->filter); |
1254 | if (!ust_bytecode) { | |
1255 | ret = -LTTNG_ERR_NOMEM; | |
1256 | goto error; | |
1257 | } | |
fb45065e | 1258 | pthread_mutex_lock(&app->sock_lock); |
51755dc8 | 1259 | ret = ustctl_set_filter(app->sock, ust_bytecode, |
53a80697 | 1260 | ua_event->obj); |
fb45065e | 1261 | pthread_mutex_unlock(&app->sock_lock); |
53a80697 | 1262 | if (ret < 0) { |
ffe60014 DG |
1263 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1264 | ERR("UST app event %s filter failed for app (pid: %d) " | |
1265 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1266 | } else { | |
3757b385 DG |
1267 | /* |
1268 | * This is normal behavior, an application can die during the | |
1269 | * creation process. Don't report an error so the execution can | |
1270 | * continue normally. | |
1271 | */ | |
1272 | ret = 0; | |
ffe60014 DG |
1273 | DBG3("UST app filter event failed. Application is dead."); |
1274 | } | |
53a80697 MD |
1275 | goto error; |
1276 | } | |
1277 | ||
1278 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
1279 | ||
1280 | error: | |
840cb59c | 1281 | health_code_update(); |
51755dc8 | 1282 | free(ust_bytecode); |
53a80697 MD |
1283 | return ret; |
1284 | } | |
1285 | ||
51755dc8 JG |
1286 | static |
1287 | struct lttng_ust_event_exclusion *create_ust_exclusion_from_exclusion( | |
1288 | struct lttng_event_exclusion *exclusion) | |
1289 | { | |
1290 | struct lttng_ust_event_exclusion *ust_exclusion = NULL; | |
1291 | size_t exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) + | |
1292 | LTTNG_UST_SYM_NAME_LEN * exclusion->count; | |
1293 | ||
1294 | ust_exclusion = zmalloc(exclusion_alloc_size); | |
1295 | if (!ust_exclusion) { | |
1296 | PERROR("malloc"); | |
1297 | goto end; | |
1298 | } | |
1299 | ||
1300 | assert(sizeof(struct lttng_event_exclusion) == | |
1301 | sizeof(struct lttng_ust_event_exclusion)); | |
1302 | memcpy(ust_exclusion, exclusion, exclusion_alloc_size); | |
1303 | end: | |
1304 | return ust_exclusion; | |
1305 | } | |
1306 | ||
7cc9a73c JI |
1307 | /* |
1308 | * Set event exclusions on the tracer. | |
1309 | */ | |
1310 | static | |
1311 | int set_ust_event_exclusion(struct ust_app_event *ua_event, | |
1312 | struct ust_app *app) | |
1313 | { | |
1314 | int ret; | |
51755dc8 | 1315 | struct lttng_ust_event_exclusion *ust_exclusion = NULL; |
7cc9a73c JI |
1316 | |
1317 | health_code_update(); | |
1318 | ||
1319 | if (!ua_event->exclusion || !ua_event->exclusion->count) { | |
1320 | ret = 0; | |
1321 | goto error; | |
1322 | } | |
1323 | ||
51755dc8 JG |
1324 | ust_exclusion = create_ust_exclusion_from_exclusion( |
1325 | ua_event->exclusion); | |
1326 | if (!ust_exclusion) { | |
1327 | ret = -LTTNG_ERR_NOMEM; | |
1328 | goto error; | |
1329 | } | |
fb45065e | 1330 | pthread_mutex_lock(&app->sock_lock); |
51755dc8 | 1331 | ret = ustctl_set_exclusion(app->sock, ust_exclusion, ua_event->obj); |
fb45065e | 1332 | pthread_mutex_unlock(&app->sock_lock); |
7cc9a73c JI |
1333 | if (ret < 0) { |
1334 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1335 | ERR("UST app event %s exclusions failed for app (pid: %d) " | |
1336 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1337 | } else { | |
1338 | /* | |
1339 | * This is normal behavior, an application can die during the | |
1340 | * creation process. Don't report an error so the execution can | |
1341 | * continue normally. | |
1342 | */ | |
1343 | ret = 0; | |
1344 | DBG3("UST app event exclusion failed. Application is dead."); | |
1345 | } | |
1346 | goto error; | |
1347 | } | |
1348 | ||
1349 | DBG2("UST exclusion set successfully for event %s", ua_event->name); | |
1350 | ||
1351 | error: | |
1352 | health_code_update(); | |
51755dc8 | 1353 | free(ust_exclusion); |
7cc9a73c JI |
1354 | return ret; |
1355 | } | |
1356 | ||
9730260e DG |
1357 | /* |
1358 | * Disable the specified event on to UST tracer for the UST session. | |
1359 | */ | |
1360 | static int disable_ust_event(struct ust_app *app, | |
1361 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1362 | { | |
1363 | int ret; | |
1364 | ||
840cb59c | 1365 | health_code_update(); |
86acf0da | 1366 | |
fb45065e | 1367 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1368 | ret = ustctl_disable(app->sock, ua_event->obj); |
fb45065e | 1369 | pthread_mutex_unlock(&app->sock_lock); |
9730260e | 1370 | if (ret < 0) { |
ffe60014 DG |
1371 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1372 | ERR("UST app event %s disable failed for app (pid: %d) " | |
1373 | "and session handle %d with ret %d", | |
1374 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1375 | } else { | |
3757b385 DG |
1376 | /* |
1377 | * This is normal behavior, an application can die during the | |
1378 | * creation process. Don't report an error so the execution can | |
1379 | * continue normally. | |
1380 | */ | |
1381 | ret = 0; | |
ffe60014 DG |
1382 | DBG3("UST app disable event failed. Application is dead."); |
1383 | } | |
9730260e DG |
1384 | goto error; |
1385 | } | |
1386 | ||
1387 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 1388 | ua_event->attr.name, app->pid); |
9730260e DG |
1389 | |
1390 | error: | |
840cb59c | 1391 | health_code_update(); |
9730260e DG |
1392 | return ret; |
1393 | } | |
1394 | ||
78f0bacd DG |
1395 | /* |
1396 | * Disable the specified channel on to UST tracer for the UST session. | |
1397 | */ | |
1398 | static int disable_ust_channel(struct ust_app *app, | |
1399 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1400 | { | |
1401 | int ret; | |
1402 | ||
840cb59c | 1403 | health_code_update(); |
86acf0da | 1404 | |
fb45065e | 1405 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1406 | ret = ustctl_disable(app->sock, ua_chan->obj); |
fb45065e | 1407 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1408 | if (ret < 0) { |
ffe60014 DG |
1409 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1410 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1411 | "and session handle %d with ret %d", | |
1412 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1413 | } else { | |
3757b385 DG |
1414 | /* |
1415 | * This is normal behavior, an application can die during the | |
1416 | * creation process. Don't report an error so the execution can | |
1417 | * continue normally. | |
1418 | */ | |
1419 | ret = 0; | |
ffe60014 DG |
1420 | DBG3("UST app disable channel failed. Application is dead."); |
1421 | } | |
78f0bacd DG |
1422 | goto error; |
1423 | } | |
1424 | ||
78f0bacd | 1425 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1426 | ua_chan->name, app->pid); |
78f0bacd DG |
1427 | |
1428 | error: | |
840cb59c | 1429 | health_code_update(); |
78f0bacd DG |
1430 | return ret; |
1431 | } | |
1432 | ||
1433 | /* | |
1434 | * Enable the specified channel on to UST tracer for the UST session. | |
1435 | */ | |
1436 | static int enable_ust_channel(struct ust_app *app, | |
1437 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1438 | { | |
1439 | int ret; | |
1440 | ||
840cb59c | 1441 | health_code_update(); |
86acf0da | 1442 | |
fb45065e | 1443 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1444 | ret = ustctl_enable(app->sock, ua_chan->obj); |
fb45065e | 1445 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1446 | if (ret < 0) { |
ffe60014 DG |
1447 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1448 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1449 | "and session handle %d with ret %d", | |
1450 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1451 | } else { | |
3757b385 DG |
1452 | /* |
1453 | * This is normal behavior, an application can die during the | |
1454 | * creation process. Don't report an error so the execution can | |
1455 | * continue normally. | |
1456 | */ | |
1457 | ret = 0; | |
ffe60014 DG |
1458 | DBG3("UST app enable channel failed. Application is dead."); |
1459 | } | |
78f0bacd DG |
1460 | goto error; |
1461 | } | |
1462 | ||
1463 | ua_chan->enabled = 1; | |
1464 | ||
1465 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1466 | ua_chan->name, app->pid); |
78f0bacd DG |
1467 | |
1468 | error: | |
840cb59c | 1469 | health_code_update(); |
78f0bacd DG |
1470 | return ret; |
1471 | } | |
1472 | ||
edb67388 DG |
1473 | /* |
1474 | * Enable the specified event on to UST tracer for the UST session. | |
1475 | */ | |
1476 | static int enable_ust_event(struct ust_app *app, | |
1477 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1478 | { | |
1479 | int ret; | |
1480 | ||
840cb59c | 1481 | health_code_update(); |
86acf0da | 1482 | |
fb45065e | 1483 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1484 | ret = ustctl_enable(app->sock, ua_event->obj); |
fb45065e | 1485 | pthread_mutex_unlock(&app->sock_lock); |
edb67388 | 1486 | if (ret < 0) { |
ffe60014 DG |
1487 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1488 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1489 | "and session handle %d with ret %d", | |
1490 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1491 | } else { | |
3757b385 DG |
1492 | /* |
1493 | * This is normal behavior, an application can die during the | |
1494 | * creation process. Don't report an error so the execution can | |
1495 | * continue normally. | |
1496 | */ | |
1497 | ret = 0; | |
ffe60014 DG |
1498 | DBG3("UST app enable event failed. Application is dead."); |
1499 | } | |
edb67388 DG |
1500 | goto error; |
1501 | } | |
1502 | ||
1503 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1504 | ua_event->attr.name, app->pid); |
edb67388 DG |
1505 | |
1506 | error: | |
840cb59c | 1507 | health_code_update(); |
edb67388 DG |
1508 | return ret; |
1509 | } | |
1510 | ||
099e26bd | 1511 | /* |
7972aab2 | 1512 | * Send channel and stream buffer to application. |
4f3ab6ee | 1513 | * |
ffe60014 | 1514 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1515 | */ |
7972aab2 DG |
1516 | static int send_channel_pid_to_ust(struct ust_app *app, |
1517 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1518 | { |
1519 | int ret; | |
ffe60014 | 1520 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1521 | |
1522 | assert(app); | |
ffe60014 | 1523 | assert(ua_sess); |
4f3ab6ee | 1524 | assert(ua_chan); |
4f3ab6ee | 1525 | |
840cb59c | 1526 | health_code_update(); |
4f3ab6ee | 1527 | |
7972aab2 DG |
1528 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1529 | app->sock); | |
86acf0da | 1530 | |
ffe60014 DG |
1531 | /* Send channel to the application. */ |
1532 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
1533 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1534 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1535 | goto error; | |
1536 | } else if (ret < 0) { | |
b551a063 DG |
1537 | goto error; |
1538 | } | |
1539 | ||
d88aee68 DG |
1540 | health_code_update(); |
1541 | ||
ffe60014 DG |
1542 | /* Send all streams to application. */ |
1543 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1544 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
a7169585 MD |
1545 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1546 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1547 | goto error; | |
1548 | } else if (ret < 0) { | |
ffe60014 DG |
1549 | goto error; |
1550 | } | |
1551 | /* We don't need the stream anymore once sent to the tracer. */ | |
1552 | cds_list_del(&stream->list); | |
fb45065e | 1553 | delete_ust_app_stream(-1, stream, app); |
ffe60014 | 1554 | } |
ffe60014 DG |
1555 | /* Flag the channel that it is sent to the application. */ |
1556 | ua_chan->is_sent = 1; | |
ffe60014 | 1557 | |
b551a063 | 1558 | error: |
840cb59c | 1559 | health_code_update(); |
b551a063 DG |
1560 | return ret; |
1561 | } | |
1562 | ||
91d76f53 | 1563 | /* |
5b4a0ec0 | 1564 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1565 | * |
1566 | * Should be called with session mutex held. | |
91d76f53 | 1567 | */ |
edb67388 DG |
1568 | static |
1569 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1570 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1571 | { |
5b4a0ec0 | 1572 | int ret = 0; |
284d8f55 | 1573 | |
840cb59c | 1574 | health_code_update(); |
86acf0da | 1575 | |
5b4a0ec0 | 1576 | /* Create UST event on tracer */ |
fb45065e | 1577 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1578 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 | 1579 | &ua_event->obj); |
fb45065e | 1580 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 | 1581 | if (ret < 0) { |
ffe60014 DG |
1582 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1583 | ERR("Error ustctl create event %s for app pid: %d with ret %d", | |
1584 | ua_event->attr.name, app->pid, ret); | |
1585 | } else { | |
3757b385 DG |
1586 | /* |
1587 | * This is normal behavior, an application can die during the | |
1588 | * creation process. Don't report an error so the execution can | |
1589 | * continue normally. | |
1590 | */ | |
1591 | ret = 0; | |
ffe60014 DG |
1592 | DBG3("UST app create event failed. Application is dead."); |
1593 | } | |
5b4a0ec0 | 1594 | goto error; |
91d76f53 | 1595 | } |
f6a9efaa | 1596 | |
5b4a0ec0 | 1597 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1598 | |
5b4a0ec0 | 1599 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1600 | ua_event->attr.name, app->pid); |
f6a9efaa | 1601 | |
840cb59c | 1602 | health_code_update(); |
86acf0da | 1603 | |
025faf73 DG |
1604 | /* Set filter if one is present. */ |
1605 | if (ua_event->filter) { | |
1606 | ret = set_ust_event_filter(ua_event, app); | |
1607 | if (ret < 0) { | |
1608 | goto error; | |
1609 | } | |
1610 | } | |
1611 | ||
7cc9a73c JI |
1612 | /* Set exclusions for the event */ |
1613 | if (ua_event->exclusion) { | |
1614 | ret = set_ust_event_exclusion(ua_event, app); | |
1615 | if (ret < 0) { | |
1616 | goto error; | |
1617 | } | |
1618 | } | |
1619 | ||
8535a6d9 | 1620 | /* If event not enabled, disable it on the tracer */ |
40113787 MD |
1621 | if (ua_event->enabled) { |
1622 | /* | |
1623 | * We now need to explicitly enable the event, since it | |
1624 | * is now disabled at creation. | |
1625 | */ | |
1626 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1627 | if (ret < 0) { | |
1628 | /* | |
1629 | * If we hit an EPERM, something is wrong with our enable call. If | |
1630 | * we get an EEXIST, there is a problem on the tracer side since we | |
1631 | * just created it. | |
1632 | */ | |
1633 | switch (ret) { | |
1634 | case -LTTNG_UST_ERR_PERM: | |
1635 | /* Code flow problem */ | |
1636 | assert(0); | |
1637 | case -LTTNG_UST_ERR_EXIST: | |
1638 | /* It's OK for our use case. */ | |
1639 | ret = 0; | |
1640 | break; | |
1641 | default: | |
1642 | break; | |
1643 | } | |
1644 | goto error; | |
1645 | } | |
8535a6d9 DG |
1646 | } |
1647 | ||
5b4a0ec0 | 1648 | error: |
840cb59c | 1649 | health_code_update(); |
5b4a0ec0 | 1650 | return ret; |
91d76f53 | 1651 | } |
48842b30 | 1652 | |
5b4a0ec0 DG |
1653 | /* |
1654 | * Copy data between an UST app event and a LTT event. | |
1655 | */ | |
421cb601 | 1656 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1657 | struct ltt_ust_event *uevent) |
1658 | { | |
b4ffad32 JI |
1659 | size_t exclusion_alloc_size; |
1660 | ||
48842b30 DG |
1661 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); |
1662 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1663 | ||
fc34caaa DG |
1664 | ua_event->enabled = uevent->enabled; |
1665 | ||
5b4a0ec0 DG |
1666 | /* Copy event attributes */ |
1667 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1668 | ||
53a80697 MD |
1669 | /* Copy filter bytecode */ |
1670 | if (uevent->filter) { | |
51755dc8 | 1671 | ua_event->filter = copy_filter_bytecode(uevent->filter); |
025faf73 | 1672 | /* Filter might be NULL here in case of ENONEM. */ |
53a80697 | 1673 | } |
b4ffad32 JI |
1674 | |
1675 | /* Copy exclusion data */ | |
1676 | if (uevent->exclusion) { | |
51755dc8 | 1677 | exclusion_alloc_size = sizeof(struct lttng_event_exclusion) + |
b4ffad32 JI |
1678 | LTTNG_UST_SYM_NAME_LEN * uevent->exclusion->count; |
1679 | ua_event->exclusion = zmalloc(exclusion_alloc_size); | |
5f8df26c JI |
1680 | if (ua_event->exclusion == NULL) { |
1681 | PERROR("malloc"); | |
1682 | } else { | |
1683 | memcpy(ua_event->exclusion, uevent->exclusion, | |
1684 | exclusion_alloc_size); | |
b4ffad32 JI |
1685 | } |
1686 | } | |
48842b30 DG |
1687 | } |
1688 | ||
5b4a0ec0 DG |
1689 | /* |
1690 | * Copy data between an UST app channel and a LTT channel. | |
1691 | */ | |
421cb601 | 1692 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1693 | struct ltt_ust_channel *uchan) |
1694 | { | |
bec39940 | 1695 | struct lttng_ht_iter iter; |
48842b30 | 1696 | struct ltt_ust_event *uevent; |
55cc08a6 | 1697 | struct ltt_ust_context *uctx; |
48842b30 | 1698 | struct ust_app_event *ua_event; |
55cc08a6 | 1699 | struct ust_app_ctx *ua_ctx; |
48842b30 | 1700 | |
fc34caaa | 1701 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1702 | |
1703 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1704 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 1705 | |
1624d5b7 JD |
1706 | ua_chan->tracefile_size = uchan->tracefile_size; |
1707 | ua_chan->tracefile_count = uchan->tracefile_count; | |
1708 | ||
ffe60014 DG |
1709 | /* Copy event attributes since the layout is different. */ |
1710 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1711 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1712 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1713 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1714 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
1715 | ua_chan->attr.output = uchan->attr.output; | |
1716 | /* | |
1717 | * Note that the attribute channel type is not set since the channel on the | |
1718 | * tracing registry side does not have this information. | |
1719 | */ | |
48842b30 | 1720 | |
fc34caaa | 1721 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1722 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1723 | |
31746f93 | 1724 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { |
55cc08a6 DG |
1725 | ua_ctx = alloc_ust_app_ctx(&uctx->ctx); |
1726 | if (ua_ctx == NULL) { | |
1727 | continue; | |
1728 | } | |
bec39940 DG |
1729 | lttng_ht_node_init_ulong(&ua_ctx->node, |
1730 | (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 1731 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 1732 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
55cc08a6 | 1733 | } |
48842b30 | 1734 | |
421cb601 | 1735 | /* Copy all events from ltt ust channel to ust app channel */ |
bec39940 | 1736 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
18eace3b | 1737 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 1738 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 1739 | if (ua_event == NULL) { |
421cb601 | 1740 | DBG2("UST event %s not found on shadow copy channel", |
48842b30 | 1741 | uevent->attr.name); |
284d8f55 | 1742 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
48842b30 | 1743 | if (ua_event == NULL) { |
5b4a0ec0 | 1744 | continue; |
48842b30 | 1745 | } |
421cb601 | 1746 | shadow_copy_event(ua_event, uevent); |
d0b96690 | 1747 | add_unique_ust_app_event(ua_chan, ua_event); |
48842b30 | 1748 | } |
48842b30 DG |
1749 | } |
1750 | ||
fc34caaa | 1751 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1752 | } |
1753 | ||
5b4a0ec0 DG |
1754 | /* |
1755 | * Copy data between a UST app session and a regular LTT session. | |
1756 | */ | |
421cb601 | 1757 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1758 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1759 | { |
bec39940 DG |
1760 | struct lttng_ht_node_str *ua_chan_node; |
1761 | struct lttng_ht_iter iter; | |
48842b30 DG |
1762 | struct ltt_ust_channel *uchan; |
1763 | struct ust_app_channel *ua_chan; | |
477d7741 MD |
1764 | time_t rawtime; |
1765 | struct tm *timeinfo; | |
1766 | char datetime[16]; | |
1767 | int ret; | |
d7ba1388 | 1768 | char tmp_shm_path[PATH_MAX]; |
477d7741 MD |
1769 | |
1770 | /* Get date and time for unique app path */ | |
1771 | time(&rawtime); | |
1772 | timeinfo = localtime(&rawtime); | |
1773 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1774 | |
421cb601 | 1775 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1776 | |
7972aab2 DG |
1777 | ua_sess->tracing_id = usess->id; |
1778 | ua_sess->id = get_next_session_id(); | |
1779 | ua_sess->uid = app->uid; | |
1780 | ua_sess->gid = app->gid; | |
1781 | ua_sess->euid = usess->uid; | |
1782 | ua_sess->egid = usess->gid; | |
1783 | ua_sess->buffer_type = usess->buffer_type; | |
1784 | ua_sess->bits_per_long = app->bits_per_long; | |
6addfa37 | 1785 | |
7972aab2 | 1786 | /* There is only one consumer object per session possible. */ |
6addfa37 | 1787 | consumer_output_get(usess->consumer); |
7972aab2 | 1788 | ua_sess->consumer = usess->consumer; |
6addfa37 | 1789 | |
2bba9e53 | 1790 | ua_sess->output_traces = usess->output_traces; |
ecc48a90 | 1791 | ua_sess->live_timer_interval = usess->live_timer_interval; |
84ad93e8 DG |
1792 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, |
1793 | &usess->metadata_attr); | |
7972aab2 DG |
1794 | |
1795 | switch (ua_sess->buffer_type) { | |
1796 | case LTTNG_BUFFER_PER_PID: | |
1797 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 1798 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
1799 | datetime); |
1800 | break; | |
1801 | case LTTNG_BUFFER_PER_UID: | |
1802 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1803 | DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long); | |
1804 | break; | |
1805 | default: | |
1806 | assert(0); | |
1807 | goto error; | |
1808 | } | |
477d7741 MD |
1809 | if (ret < 0) { |
1810 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1811 | assert(0); |
7972aab2 | 1812 | goto error; |
477d7741 MD |
1813 | } |
1814 | ||
3d071855 MD |
1815 | strncpy(ua_sess->root_shm_path, usess->root_shm_path, |
1816 | sizeof(ua_sess->root_shm_path)); | |
1817 | ua_sess->root_shm_path[sizeof(ua_sess->root_shm_path) - 1] = '\0'; | |
d7ba1388 MD |
1818 | strncpy(ua_sess->shm_path, usess->shm_path, |
1819 | sizeof(ua_sess->shm_path)); | |
1820 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
1821 | if (ua_sess->shm_path[0]) { | |
1822 | switch (ua_sess->buffer_type) { | |
1823 | case LTTNG_BUFFER_PER_PID: | |
1824 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
1825 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", | |
1826 | app->name, app->pid, datetime); | |
1827 | break; | |
1828 | case LTTNG_BUFFER_PER_UID: | |
1829 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
1830 | DEFAULT_UST_TRACE_UID_PATH, | |
1831 | app->uid, app->bits_per_long); | |
1832 | break; | |
1833 | default: | |
1834 | assert(0); | |
1835 | goto error; | |
1836 | } | |
1837 | if (ret < 0) { | |
1838 | PERROR("sprintf UST shadow copy session"); | |
1839 | assert(0); | |
1840 | goto error; | |
1841 | } | |
1842 | strncat(ua_sess->shm_path, tmp_shm_path, | |
1843 | sizeof(ua_sess->shm_path) - strlen(ua_sess->shm_path) - 1); | |
1844 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
1845 | } | |
1846 | ||
48842b30 | 1847 | /* Iterate over all channels in global domain. */ |
bec39940 DG |
1848 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, |
1849 | uchan, node.node) { | |
1850 | struct lttng_ht_iter uiter; | |
ba767faf | 1851 | |
bec39940 DG |
1852 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
1853 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
5b4a0ec0 | 1854 | if (ua_chan_node != NULL) { |
fc34caaa | 1855 | /* Session exist. Contiuing. */ |
5b4a0ec0 DG |
1856 | continue; |
1857 | } | |
421cb601 | 1858 | |
5b4a0ec0 DG |
1859 | DBG2("Channel %s not found on shadow session copy, creating it", |
1860 | uchan->name); | |
d0b96690 | 1861 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
5b4a0ec0 | 1862 | if (ua_chan == NULL) { |
fc34caaa | 1863 | /* malloc failed FIXME: Might want to do handle ENOMEM .. */ |
5b4a0ec0 | 1864 | continue; |
48842b30 | 1865 | } |
5b4a0ec0 | 1866 | shadow_copy_channel(ua_chan, uchan); |
ffe60014 DG |
1867 | /* |
1868 | * The concept of metadata channel does not exist on the tracing | |
1869 | * registry side of the session daemon so this can only be a per CPU | |
1870 | * channel and not metadata. | |
1871 | */ | |
1872 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
1873 | ||
bec39940 | 1874 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); |
48842b30 | 1875 | } |
6addfa37 | 1876 | return; |
7972aab2 DG |
1877 | |
1878 | error: | |
6addfa37 | 1879 | consumer_output_put(ua_sess->consumer); |
48842b30 DG |
1880 | } |
1881 | ||
78f0bacd DG |
1882 | /* |
1883 | * Lookup sesison wrapper. | |
1884 | */ | |
84cd17c6 MD |
1885 | static |
1886 | void __lookup_session_by_app(struct ltt_ust_session *usess, | |
bec39940 | 1887 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1888 | { |
1889 | /* Get right UST app session from app */ | |
d9bf3ca4 | 1890 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
1891 | } |
1892 | ||
421cb601 DG |
1893 | /* |
1894 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1895 | * id. |
421cb601 | 1896 | */ |
48842b30 DG |
1897 | static struct ust_app_session *lookup_session_by_app( |
1898 | struct ltt_ust_session *usess, struct ust_app *app) | |
1899 | { | |
bec39940 | 1900 | struct lttng_ht_iter iter; |
d9bf3ca4 | 1901 | struct lttng_ht_node_u64 *node; |
48842b30 | 1902 | |
84cd17c6 | 1903 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 1904 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
1905 | if (node == NULL) { |
1906 | goto error; | |
1907 | } | |
1908 | ||
1909 | return caa_container_of(node, struct ust_app_session, node); | |
1910 | ||
1911 | error: | |
1912 | return NULL; | |
1913 | } | |
1914 | ||
7972aab2 DG |
1915 | /* |
1916 | * Setup buffer registry per PID for the given session and application. If none | |
1917 | * is found, a new one is created, added to the global registry and | |
1918 | * initialized. If regp is valid, it's set with the newly created object. | |
1919 | * | |
1920 | * Return 0 on success or else a negative value. | |
1921 | */ | |
1922 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
1923 | struct ust_app *app, struct buffer_reg_pid **regp) | |
1924 | { | |
1925 | int ret = 0; | |
1926 | struct buffer_reg_pid *reg_pid; | |
1927 | ||
1928 | assert(ua_sess); | |
1929 | assert(app); | |
1930 | ||
1931 | rcu_read_lock(); | |
1932 | ||
1933 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
1934 | if (!reg_pid) { | |
1935 | /* | |
1936 | * This is the create channel path meaning that if there is NO | |
1937 | * registry available, we have to create one for this session. | |
1938 | */ | |
d7ba1388 | 1939 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid, |
3d071855 | 1940 | ua_sess->root_shm_path, ua_sess->shm_path); |
7972aab2 DG |
1941 | if (ret < 0) { |
1942 | goto error; | |
1943 | } | |
7972aab2 DG |
1944 | } else { |
1945 | goto end; | |
1946 | } | |
1947 | ||
1948 | /* Initialize registry. */ | |
1949 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
1950 | app->bits_per_long, app->uint8_t_alignment, | |
1951 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1952 | app->uint64_t_alignment, app->long_alignment, |
1953 | app->byte_order, app->version.major, | |
3d071855 MD |
1954 | app->version.minor, reg_pid->root_shm_path, |
1955 | reg_pid->shm_path, | |
d7ba1388 | 1956 | ua_sess->euid, ua_sess->egid); |
7972aab2 | 1957 | if (ret < 0) { |
286c991a MD |
1958 | /* |
1959 | * reg_pid->registry->reg.ust is NULL upon error, so we need to | |
1960 | * destroy the buffer registry, because it is always expected | |
1961 | * that if the buffer registry can be found, its ust registry is | |
1962 | * non-NULL. | |
1963 | */ | |
1964 | buffer_reg_pid_destroy(reg_pid); | |
7972aab2 DG |
1965 | goto error; |
1966 | } | |
1967 | ||
286c991a MD |
1968 | buffer_reg_pid_add(reg_pid); |
1969 | ||
7972aab2 DG |
1970 | DBG3("UST app buffer registry per PID created successfully"); |
1971 | ||
1972 | end: | |
1973 | if (regp) { | |
1974 | *regp = reg_pid; | |
1975 | } | |
1976 | error: | |
1977 | rcu_read_unlock(); | |
1978 | return ret; | |
1979 | } | |
1980 | ||
1981 | /* | |
1982 | * Setup buffer registry per UID for the given session and application. If none | |
1983 | * is found, a new one is created, added to the global registry and | |
1984 | * initialized. If regp is valid, it's set with the newly created object. | |
1985 | * | |
1986 | * Return 0 on success or else a negative value. | |
1987 | */ | |
1988 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
d7ba1388 | 1989 | struct ust_app_session *ua_sess, |
7972aab2 DG |
1990 | struct ust_app *app, struct buffer_reg_uid **regp) |
1991 | { | |
1992 | int ret = 0; | |
1993 | struct buffer_reg_uid *reg_uid; | |
1994 | ||
1995 | assert(usess); | |
1996 | assert(app); | |
1997 | ||
1998 | rcu_read_lock(); | |
1999 | ||
2000 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2001 | if (!reg_uid) { | |
2002 | /* | |
2003 | * This is the create channel path meaning that if there is NO | |
2004 | * registry available, we have to create one for this session. | |
2005 | */ | |
2006 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
3d071855 MD |
2007 | LTTNG_DOMAIN_UST, ®_uid, |
2008 | ua_sess->root_shm_path, ua_sess->shm_path); | |
7972aab2 DG |
2009 | if (ret < 0) { |
2010 | goto error; | |
2011 | } | |
7972aab2 DG |
2012 | } else { |
2013 | goto end; | |
2014 | } | |
2015 | ||
2016 | /* Initialize registry. */ | |
af6142cf | 2017 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
2018 | app->bits_per_long, app->uint8_t_alignment, |
2019 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
2020 | app->uint64_t_alignment, app->long_alignment, |
2021 | app->byte_order, app->version.major, | |
3d071855 MD |
2022 | app->version.minor, reg_uid->root_shm_path, |
2023 | reg_uid->shm_path, usess->uid, usess->gid); | |
7972aab2 | 2024 | if (ret < 0) { |
286c991a MD |
2025 | /* |
2026 | * reg_uid->registry->reg.ust is NULL upon error, so we need to | |
2027 | * destroy the buffer registry, because it is always expected | |
2028 | * that if the buffer registry can be found, its ust registry is | |
2029 | * non-NULL. | |
2030 | */ | |
2031 | buffer_reg_uid_destroy(reg_uid, NULL); | |
7972aab2 DG |
2032 | goto error; |
2033 | } | |
2034 | /* Add node to teardown list of the session. */ | |
2035 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
2036 | ||
286c991a | 2037 | buffer_reg_uid_add(reg_uid); |
7972aab2 | 2038 | |
286c991a | 2039 | DBG3("UST app buffer registry per UID created successfully"); |
7972aab2 DG |
2040 | end: |
2041 | if (regp) { | |
2042 | *regp = reg_uid; | |
2043 | } | |
2044 | error: | |
2045 | rcu_read_unlock(); | |
2046 | return ret; | |
2047 | } | |
2048 | ||
421cb601 | 2049 | /* |
3d8ca23b | 2050 | * Create a session on the tracer side for the given app. |
421cb601 | 2051 | * |
3d8ca23b DG |
2052 | * On success, ua_sess_ptr is populated with the session pointer or else left |
2053 | * untouched. If the session was created, is_created is set to 1. On error, | |
2054 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
2055 | * be NULL. | |
2056 | * | |
2057 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
2058 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 2059 | */ |
3d8ca23b DG |
2060 | static int create_ust_app_session(struct ltt_ust_session *usess, |
2061 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, | |
2062 | int *is_created) | |
421cb601 | 2063 | { |
3d8ca23b | 2064 | int ret, created = 0; |
421cb601 DG |
2065 | struct ust_app_session *ua_sess; |
2066 | ||
3d8ca23b DG |
2067 | assert(usess); |
2068 | assert(app); | |
2069 | assert(ua_sess_ptr); | |
2070 | ||
840cb59c | 2071 | health_code_update(); |
86acf0da | 2072 | |
421cb601 DG |
2073 | ua_sess = lookup_session_by_app(usess, app); |
2074 | if (ua_sess == NULL) { | |
d9bf3ca4 | 2075 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 2076 | app->pid, usess->id); |
d0b96690 | 2077 | ua_sess = alloc_ust_app_session(app); |
421cb601 DG |
2078 | if (ua_sess == NULL) { |
2079 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
2080 | ret = -ENOMEM; |
2081 | goto error; | |
421cb601 | 2082 | } |
477d7741 | 2083 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 2084 | created = 1; |
421cb601 DG |
2085 | } |
2086 | ||
7972aab2 DG |
2087 | switch (usess->buffer_type) { |
2088 | case LTTNG_BUFFER_PER_PID: | |
2089 | /* Init local registry. */ | |
2090 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 2091 | if (ret < 0) { |
e64207cf | 2092 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2093 | goto error; |
2094 | } | |
2095 | break; | |
2096 | case LTTNG_BUFFER_PER_UID: | |
2097 | /* Look for a global registry. If none exists, create one. */ | |
d7ba1388 | 2098 | ret = setup_buffer_reg_uid(usess, ua_sess, app, NULL); |
7972aab2 | 2099 | if (ret < 0) { |
e64207cf | 2100 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2101 | goto error; |
2102 | } | |
2103 | break; | |
2104 | default: | |
2105 | assert(0); | |
2106 | ret = -EINVAL; | |
2107 | goto error; | |
2108 | } | |
2109 | ||
2110 | health_code_update(); | |
2111 | ||
2112 | if (ua_sess->handle == -1) { | |
fb45065e | 2113 | pthread_mutex_lock(&app->sock_lock); |
7972aab2 | 2114 | ret = ustctl_create_session(app->sock); |
fb45065e | 2115 | pthread_mutex_unlock(&app->sock_lock); |
7972aab2 DG |
2116 | if (ret < 0) { |
2117 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
2118 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
2119 | app->pid, ret); |
2120 | } else { | |
2121 | DBG("UST app creating session failed. Application is dead"); | |
3757b385 DG |
2122 | /* |
2123 | * This is normal behavior, an application can die during the | |
2124 | * creation process. Don't report an error so the execution can | |
2125 | * continue normally. This will get flagged ENOTCONN and the | |
2126 | * caller will handle it. | |
2127 | */ | |
2128 | ret = 0; | |
ffe60014 | 2129 | } |
d0b96690 | 2130 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
2131 | if (ret != -ENOMEM) { |
2132 | /* | |
2133 | * Tracer is probably gone or got an internal error so let's | |
2134 | * behave like it will soon unregister or not usable. | |
2135 | */ | |
2136 | ret = -ENOTCONN; | |
2137 | } | |
2138 | goto error; | |
421cb601 DG |
2139 | } |
2140 | ||
7972aab2 DG |
2141 | ua_sess->handle = ret; |
2142 | ||
2143 | /* Add ust app session to app's HT */ | |
d9bf3ca4 MD |
2144 | lttng_ht_node_init_u64(&ua_sess->node, |
2145 | ua_sess->tracing_id); | |
2146 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
10b56aef MD |
2147 | lttng_ht_node_init_ulong(&ua_sess->ust_objd_node, ua_sess->handle); |
2148 | lttng_ht_add_unique_ulong(app->ust_sessions_objd, | |
2149 | &ua_sess->ust_objd_node); | |
7972aab2 DG |
2150 | |
2151 | DBG2("UST app session created successfully with handle %d", ret); | |
2152 | } | |
2153 | ||
2154 | *ua_sess_ptr = ua_sess; | |
2155 | if (is_created) { | |
2156 | *is_created = created; | |
2157 | } | |
2158 | ||
2159 | /* Everything went well. */ | |
2160 | ret = 0; | |
2161 | ||
2162 | error: | |
2163 | health_code_update(); | |
2164 | return ret; | |
2165 | } | |
2166 | ||
6a6b2068 JG |
2167 | /* |
2168 | * Match function for a hash table lookup of ust_app_ctx. | |
2169 | * | |
2170 | * It matches an ust app context based on the context type and, in the case | |
2171 | * of perf counters, their name. | |
2172 | */ | |
2173 | static int ht_match_ust_app_ctx(struct cds_lfht_node *node, const void *_key) | |
2174 | { | |
2175 | struct ust_app_ctx *ctx; | |
2176 | const struct lttng_ust_context *key; | |
2177 | ||
2178 | assert(node); | |
2179 | assert(_key); | |
2180 | ||
2181 | ctx = caa_container_of(node, struct ust_app_ctx, node.node); | |
2182 | key = _key; | |
2183 | ||
2184 | /* Context type */ | |
2185 | if (ctx->ctx.ctx != key->ctx) { | |
2186 | goto no_match; | |
2187 | } | |
2188 | ||
2189 | /* Check the name in the case of perf thread counters. */ | |
2190 | if (key->ctx == LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER) { | |
2191 | if (strncmp(key->u.perf_counter.name, | |
2192 | ctx->ctx.u.perf_counter.name, | |
2193 | sizeof(key->u.perf_counter.name))) { | |
2194 | goto no_match; | |
2195 | } | |
2196 | } | |
2197 | ||
2198 | /* Match. */ | |
2199 | return 1; | |
2200 | ||
2201 | no_match: | |
2202 | return 0; | |
2203 | } | |
2204 | ||
2205 | /* | |
2206 | * Lookup for an ust app context from an lttng_ust_context. | |
2207 | * | |
be184a0f | 2208 | * Must be called while holding RCU read side lock. |
6a6b2068 JG |
2209 | * Return an ust_app_ctx object or NULL on error. |
2210 | */ | |
2211 | static | |
2212 | struct ust_app_ctx *find_ust_app_context(struct lttng_ht *ht, | |
2213 | struct lttng_ust_context *uctx) | |
2214 | { | |
2215 | struct lttng_ht_iter iter; | |
2216 | struct lttng_ht_node_ulong *node; | |
2217 | struct ust_app_ctx *app_ctx = NULL; | |
2218 | ||
2219 | assert(uctx); | |
2220 | assert(ht); | |
2221 | ||
2222 | /* Lookup using the lttng_ust_context_type and a custom match fct. */ | |
2223 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) uctx->ctx, lttng_ht_seed), | |
2224 | ht_match_ust_app_ctx, uctx, &iter.iter); | |
2225 | node = lttng_ht_iter_get_node_ulong(&iter); | |
2226 | if (!node) { | |
2227 | goto end; | |
2228 | } | |
2229 | ||
2230 | app_ctx = caa_container_of(node, struct ust_app_ctx, node); | |
2231 | ||
2232 | end: | |
2233 | return app_ctx; | |
2234 | } | |
2235 | ||
7972aab2 DG |
2236 | /* |
2237 | * Create a context for the channel on the tracer. | |
2238 | * | |
2239 | * Called with UST app session lock held and a RCU read side lock. | |
2240 | */ | |
2241 | static | |
2242 | int create_ust_app_channel_context(struct ust_app_session *ua_sess, | |
2243 | struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx, | |
2244 | struct ust_app *app) | |
2245 | { | |
2246 | int ret = 0; | |
7972aab2 DG |
2247 | struct ust_app_ctx *ua_ctx; |
2248 | ||
2249 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
2250 | ||
6a6b2068 JG |
2251 | ua_ctx = find_ust_app_context(ua_chan->ctx, uctx); |
2252 | if (ua_ctx) { | |
7972aab2 DG |
2253 | ret = -EEXIST; |
2254 | goto error; | |
2255 | } | |
2256 | ||
2257 | ua_ctx = alloc_ust_app_ctx(uctx); | |
2258 | if (ua_ctx == NULL) { | |
2259 | /* malloc failed */ | |
2260 | ret = -1; | |
2261 | goto error; | |
2262 | } | |
2263 | ||
2264 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 2265 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 2266 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
2267 | |
2268 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
2269 | if (ret < 0) { | |
2270 | goto error; | |
2271 | } | |
2272 | ||
2273 | error: | |
2274 | return ret; | |
2275 | } | |
2276 | ||
2277 | /* | |
2278 | * Enable on the tracer side a ust app event for the session and channel. | |
2279 | * | |
2280 | * Called with UST app session lock held. | |
2281 | */ | |
2282 | static | |
2283 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
2284 | struct ust_app_event *ua_event, struct ust_app *app) | |
2285 | { | |
2286 | int ret; | |
2287 | ||
2288 | ret = enable_ust_event(app, ua_sess, ua_event); | |
2289 | if (ret < 0) { | |
2290 | goto error; | |
2291 | } | |
2292 | ||
2293 | ua_event->enabled = 1; | |
2294 | ||
2295 | error: | |
2296 | return ret; | |
2297 | } | |
2298 | ||
2299 | /* | |
2300 | * Disable on the tracer side a ust app event for the session and channel. | |
2301 | */ | |
2302 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
2303 | struct ust_app_event *ua_event, struct ust_app *app) | |
2304 | { | |
2305 | int ret; | |
2306 | ||
2307 | ret = disable_ust_event(app, ua_sess, ua_event); | |
2308 | if (ret < 0) { | |
2309 | goto error; | |
2310 | } | |
2311 | ||
2312 | ua_event->enabled = 0; | |
2313 | ||
2314 | error: | |
2315 | return ret; | |
2316 | } | |
2317 | ||
2318 | /* | |
2319 | * Lookup ust app channel for session and disable it on the tracer side. | |
2320 | */ | |
2321 | static | |
2322 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
2323 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
2324 | { | |
2325 | int ret; | |
2326 | ||
2327 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2328 | if (ret < 0) { | |
2329 | goto error; | |
2330 | } | |
2331 | ||
2332 | ua_chan->enabled = 0; | |
2333 | ||
2334 | error: | |
2335 | return ret; | |
2336 | } | |
2337 | ||
2338 | /* | |
2339 | * Lookup ust app channel for session and enable it on the tracer side. This | |
2340 | * MUST be called with a RCU read side lock acquired. | |
2341 | */ | |
2342 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
2343 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
2344 | { | |
2345 | int ret = 0; | |
2346 | struct lttng_ht_iter iter; | |
2347 | struct lttng_ht_node_str *ua_chan_node; | |
2348 | struct ust_app_channel *ua_chan; | |
2349 | ||
2350 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
2351 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
2352 | if (ua_chan_node == NULL) { | |
d9bf3ca4 | 2353 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
2354 | uchan->name, ua_sess->tracing_id); |
2355 | goto error; | |
2356 | } | |
2357 | ||
2358 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2359 | ||
2360 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
2361 | if (ret < 0) { | |
2362 | goto error; | |
2363 | } | |
2364 | ||
2365 | error: | |
2366 | return ret; | |
2367 | } | |
2368 | ||
2369 | /* | |
2370 | * Ask the consumer to create a channel and get it if successful. | |
2371 | * | |
2372 | * Return 0 on success or else a negative value. | |
2373 | */ | |
2374 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
2375 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
2376 | int bitness, struct ust_registry_session *registry) | |
2377 | { | |
2378 | int ret; | |
2379 | unsigned int nb_fd = 0; | |
2380 | struct consumer_socket *socket; | |
2381 | ||
2382 | assert(usess); | |
2383 | assert(ua_sess); | |
2384 | assert(ua_chan); | |
2385 | assert(registry); | |
2386 | ||
2387 | rcu_read_lock(); | |
2388 | health_code_update(); | |
2389 | ||
2390 | /* Get the right consumer socket for the application. */ | |
2391 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
2392 | if (!socket) { | |
2393 | ret = -EINVAL; | |
2394 | goto error; | |
2395 | } | |
2396 | ||
2397 | health_code_update(); | |
2398 | ||
2399 | /* Need one fd for the channel. */ | |
2400 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2401 | if (ret < 0) { | |
2402 | ERR("Exhausted number of available FD upon create channel"); | |
2403 | goto error; | |
2404 | } | |
2405 | ||
2406 | /* | |
2407 | * Ask consumer to create channel. The consumer will return the number of | |
2408 | * stream we have to expect. | |
2409 | */ | |
2410 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
2411 | registry); | |
2412 | if (ret < 0) { | |
2413 | goto error_ask; | |
2414 | } | |
2415 | ||
2416 | /* | |
2417 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2418 | * stream (2 being the default value here). | |
2419 | */ | |
2420 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2421 | ||
2422 | /* Reserve the amount of file descriptor we need. */ | |
2423 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2424 | if (ret < 0) { | |
2425 | ERR("Exhausted number of available FD upon create channel"); | |
2426 | goto error_fd_get_stream; | |
2427 | } | |
2428 | ||
2429 | health_code_update(); | |
2430 | ||
2431 | /* | |
2432 | * Now get the channel from the consumer. This call wil populate the stream | |
2433 | * list of that channel and set the ust objects. | |
2434 | */ | |
d9078d0c DG |
2435 | if (usess->consumer->enabled) { |
2436 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2437 | if (ret < 0) { | |
2438 | goto error_destroy; | |
2439 | } | |
7972aab2 DG |
2440 | } |
2441 | ||
2442 | rcu_read_unlock(); | |
2443 | return 0; | |
2444 | ||
2445 | error_destroy: | |
2446 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2447 | error_fd_get_stream: | |
2448 | /* | |
2449 | * Initiate a destroy channel on the consumer since we had an error | |
2450 | * handling it on our side. The return value is of no importance since we | |
2451 | * already have a ret value set by the previous error that we need to | |
2452 | * return. | |
2453 | */ | |
2454 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2455 | error_ask: | |
2456 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2457 | error: | |
2458 | health_code_update(); | |
2459 | rcu_read_unlock(); | |
2460 | return ret; | |
2461 | } | |
2462 | ||
2463 | /* | |
2464 | * Duplicate the ust data object of the ust app stream and save it in the | |
2465 | * buffer registry stream. | |
2466 | * | |
2467 | * Return 0 on success or else a negative value. | |
2468 | */ | |
2469 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2470 | struct ust_app_stream *stream) | |
2471 | { | |
2472 | int ret; | |
2473 | ||
2474 | assert(reg_stream); | |
2475 | assert(stream); | |
2476 | ||
2477 | /* Reserve the amount of file descriptor we need. */ | |
2478 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2479 | if (ret < 0) { | |
2480 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2481 | goto error; | |
2482 | } | |
2483 | ||
2484 | /* Duplicate object for stream once the original is in the registry. */ | |
2485 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2486 | reg_stream->obj.ust); | |
2487 | if (ret < 0) { | |
2488 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2489 | reg_stream->obj.ust, stream->obj, ret); | |
2490 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2491 | goto error; | |
2492 | } | |
2493 | stream->handle = stream->obj->handle; | |
2494 | ||
2495 | error: | |
2496 | return ret; | |
2497 | } | |
2498 | ||
2499 | /* | |
2500 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2501 | * buffer registry channel. | |
2502 | * | |
2503 | * Return 0 on success or else a negative value. | |
2504 | */ | |
2505 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2506 | struct ust_app_channel *ua_chan) | |
2507 | { | |
2508 | int ret; | |
2509 | ||
2510 | assert(reg_chan); | |
2511 | assert(ua_chan); | |
2512 | ||
2513 | /* Need two fds for the channel. */ | |
2514 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2515 | if (ret < 0) { | |
2516 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2517 | goto error_fd_get; | |
2518 | } | |
2519 | ||
2520 | /* Duplicate object for stream once the original is in the registry. */ | |
2521 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2522 | if (ret < 0) { | |
2523 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2524 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2525 | goto error; | |
2526 | } | |
2527 | ua_chan->handle = ua_chan->obj->handle; | |
2528 | ||
2529 | return 0; | |
2530 | ||
2531 | error: | |
2532 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2533 | error_fd_get: | |
2534 | return ret; | |
2535 | } | |
2536 | ||
2537 | /* | |
2538 | * For a given channel buffer registry, setup all streams of the given ust | |
2539 | * application channel. | |
2540 | * | |
2541 | * Return 0 on success or else a negative value. | |
2542 | */ | |
2543 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
fb45065e MD |
2544 | struct ust_app_channel *ua_chan, |
2545 | struct ust_app *app) | |
7972aab2 DG |
2546 | { |
2547 | int ret = 0; | |
2548 | struct ust_app_stream *stream, *stmp; | |
2549 | ||
2550 | assert(reg_chan); | |
2551 | assert(ua_chan); | |
2552 | ||
2553 | DBG2("UST app setup buffer registry stream"); | |
2554 | ||
2555 | /* Send all streams to application. */ | |
2556 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2557 | struct buffer_reg_stream *reg_stream; | |
2558 | ||
2559 | ret = buffer_reg_stream_create(®_stream); | |
2560 | if (ret < 0) { | |
2561 | goto error; | |
2562 | } | |
2563 | ||
2564 | /* | |
2565 | * Keep original pointer and nullify it in the stream so the delete | |
2566 | * stream call does not release the object. | |
2567 | */ | |
2568 | reg_stream->obj.ust = stream->obj; | |
2569 | stream->obj = NULL; | |
2570 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2571 | |
7972aab2 DG |
2572 | /* We don't need the streams anymore. */ |
2573 | cds_list_del(&stream->list); | |
fb45065e | 2574 | delete_ust_app_stream(-1, stream, app); |
7972aab2 | 2575 | } |
421cb601 | 2576 | |
7972aab2 DG |
2577 | error: |
2578 | return ret; | |
2579 | } | |
2580 | ||
2581 | /* | |
2582 | * Create a buffer registry channel for the given session registry and | |
2583 | * application channel object. If regp pointer is valid, it's set with the | |
2584 | * created object. Important, the created object is NOT added to the session | |
2585 | * registry hash table. | |
2586 | * | |
2587 | * Return 0 on success else a negative value. | |
2588 | */ | |
2589 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2590 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2591 | { | |
2592 | int ret; | |
2593 | struct buffer_reg_channel *reg_chan = NULL; | |
2594 | ||
2595 | assert(reg_sess); | |
2596 | assert(ua_chan); | |
2597 | ||
2598 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2599 | ||
2600 | /* Create buffer registry channel. */ | |
2601 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2602 | if (ret < 0) { | |
2603 | goto error_create; | |
421cb601 | 2604 | } |
7972aab2 DG |
2605 | assert(reg_chan); |
2606 | reg_chan->consumer_key = ua_chan->key; | |
8c924c7b | 2607 | reg_chan->subbuf_size = ua_chan->attr.subbuf_size; |
d07ceecd | 2608 | reg_chan->num_subbuf = ua_chan->attr.num_subbuf; |
421cb601 | 2609 | |
7972aab2 DG |
2610 | /* Create and add a channel registry to session. */ |
2611 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2612 | ua_chan->tracing_channel_id); | |
2613 | if (ret < 0) { | |
2614 | goto error; | |
d88aee68 | 2615 | } |
7972aab2 | 2616 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2617 | |
7972aab2 DG |
2618 | if (regp) { |
2619 | *regp = reg_chan; | |
3d8ca23b | 2620 | } |
d88aee68 | 2621 | |
7972aab2 | 2622 | return 0; |
3d8ca23b DG |
2623 | |
2624 | error: | |
7972aab2 DG |
2625 | /* Safe because the registry channel object was not added to any HT. */ |
2626 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2627 | error_create: | |
3d8ca23b | 2628 | return ret; |
421cb601 DG |
2629 | } |
2630 | ||
55cc08a6 | 2631 | /* |
7972aab2 DG |
2632 | * Setup buffer registry channel for the given session registry and application |
2633 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2634 | * |
7972aab2 | 2635 | * Return 0 on success else a negative value. |
55cc08a6 | 2636 | */ |
7972aab2 | 2637 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
fb45065e MD |
2638 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan, |
2639 | struct ust_app *app) | |
55cc08a6 | 2640 | { |
7972aab2 | 2641 | int ret; |
55cc08a6 | 2642 | |
7972aab2 DG |
2643 | assert(reg_sess); |
2644 | assert(reg_chan); | |
2645 | assert(ua_chan); | |
2646 | assert(ua_chan->obj); | |
55cc08a6 | 2647 | |
7972aab2 | 2648 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2649 | |
7972aab2 | 2650 | /* Setup all streams for the registry. */ |
fb45065e | 2651 | ret = setup_buffer_reg_streams(reg_chan, ua_chan, app); |
7972aab2 | 2652 | if (ret < 0) { |
55cc08a6 DG |
2653 | goto error; |
2654 | } | |
2655 | ||
7972aab2 DG |
2656 | reg_chan->obj.ust = ua_chan->obj; |
2657 | ua_chan->obj = NULL; | |
55cc08a6 | 2658 | |
7972aab2 | 2659 | return 0; |
55cc08a6 DG |
2660 | |
2661 | error: | |
7972aab2 DG |
2662 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2663 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2664 | return ret; |
2665 | } | |
2666 | ||
edb67388 | 2667 | /* |
7972aab2 | 2668 | * Send buffer registry channel to the application. |
d0b96690 | 2669 | * |
7972aab2 | 2670 | * Return 0 on success else a negative value. |
edb67388 | 2671 | */ |
7972aab2 DG |
2672 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2673 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2674 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2675 | { |
2676 | int ret; | |
7972aab2 | 2677 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2678 | |
7972aab2 DG |
2679 | assert(reg_chan); |
2680 | assert(app); | |
2681 | assert(ua_sess); | |
2682 | assert(ua_chan); | |
2683 | ||
2684 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2685 | ||
2686 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2687 | if (ret < 0) { |
2688 | goto error; | |
2689 | } | |
2690 | ||
7972aab2 DG |
2691 | /* Send channel to the application. */ |
2692 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
2693 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
2694 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
2695 | goto error; | |
2696 | } else if (ret < 0) { | |
7972aab2 DG |
2697 | goto error; |
2698 | } | |
2699 | ||
2700 | health_code_update(); | |
2701 | ||
2702 | /* Send all streams to application. */ | |
2703 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2704 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2705 | struct ust_app_stream stream; | |
2706 | ||
2707 | ret = duplicate_stream_object(reg_stream, &stream); | |
2708 | if (ret < 0) { | |
2709 | goto error_stream_unlock; | |
2710 | } | |
2711 | ||
2712 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2713 | if (ret < 0) { | |
fb45065e | 2714 | (void) release_ust_app_stream(-1, &stream, app); |
a7169585 MD |
2715 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
2716 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
2717 | goto error_stream_unlock; | |
2718 | } else if (ret < 0) { | |
2719 | goto error_stream_unlock; | |
2720 | } | |
7972aab2 DG |
2721 | goto error_stream_unlock; |
2722 | } | |
edb67388 | 2723 | |
7972aab2 DG |
2724 | /* |
2725 | * The return value is not important here. This function will output an | |
2726 | * error if needed. | |
2727 | */ | |
fb45065e | 2728 | (void) release_ust_app_stream(-1, &stream, app); |
7972aab2 DG |
2729 | } |
2730 | ua_chan->is_sent = 1; | |
2731 | ||
2732 | error_stream_unlock: | |
2733 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2734 | error: |
2735 | return ret; | |
2736 | } | |
2737 | ||
9730260e | 2738 | /* |
7972aab2 DG |
2739 | * Create and send to the application the created buffers with per UID buffers. |
2740 | * | |
2741 | * Return 0 on success else a negative value. | |
9730260e | 2742 | */ |
7972aab2 DG |
2743 | static int create_channel_per_uid(struct ust_app *app, |
2744 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2745 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2746 | { |
2747 | int ret; | |
7972aab2 DG |
2748 | struct buffer_reg_uid *reg_uid; |
2749 | struct buffer_reg_channel *reg_chan; | |
9730260e | 2750 | |
7972aab2 DG |
2751 | assert(app); |
2752 | assert(usess); | |
2753 | assert(ua_sess); | |
2754 | assert(ua_chan); | |
2755 | ||
2756 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2757 | ||
2758 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2759 | /* | |
2760 | * The session creation handles the creation of this global registry | |
2761 | * object. If none can be find, there is a code flow problem or a | |
2762 | * teardown race. | |
2763 | */ | |
2764 | assert(reg_uid); | |
2765 | ||
2766 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2767 | reg_uid); | |
2768 | if (!reg_chan) { | |
2769 | /* Create the buffer registry channel object. */ | |
2770 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2771 | if (ret < 0) { | |
f14256d6 MD |
2772 | ERR("Error creating the UST channel \"%s\" registry instance", |
2773 | ua_chan->name); | |
7972aab2 DG |
2774 | goto error; |
2775 | } | |
2776 | assert(reg_chan); | |
2777 | ||
2778 | /* | |
2779 | * Create the buffers on the consumer side. This call populates the | |
2780 | * ust app channel object with all streams and data object. | |
2781 | */ | |
2782 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2783 | app->bits_per_long, reg_uid->registry->reg.ust); | |
2784 | if (ret < 0) { | |
f14256d6 MD |
2785 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
2786 | ua_chan->name); | |
2787 | ||
07d2ae95 DG |
2788 | /* |
2789 | * Let's remove the previously created buffer registry channel so | |
2790 | * it's not visible anymore in the session registry. | |
2791 | */ | |
2792 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, | |
2793 | ua_chan->tracing_channel_id); | |
2794 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
2795 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
7972aab2 DG |
2796 | goto error; |
2797 | } | |
2798 | ||
2799 | /* | |
2800 | * Setup the streams and add it to the session registry. | |
2801 | */ | |
fb45065e MD |
2802 | ret = setup_buffer_reg_channel(reg_uid->registry, |
2803 | ua_chan, reg_chan, app); | |
7972aab2 | 2804 | if (ret < 0) { |
f14256d6 MD |
2805 | ERR("Error setting up UST channel \"%s\"", |
2806 | ua_chan->name); | |
7972aab2 DG |
2807 | goto error; |
2808 | } | |
2809 | ||
2810 | } | |
2811 | ||
2812 | /* Send buffers to the application. */ | |
2813 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
9730260e | 2814 | if (ret < 0) { |
a7169585 MD |
2815 | if (ret != -ENOTCONN) { |
2816 | ERR("Error sending channel to application"); | |
2817 | } | |
9730260e DG |
2818 | goto error; |
2819 | } | |
2820 | ||
9730260e DG |
2821 | error: |
2822 | return ret; | |
2823 | } | |
2824 | ||
78f0bacd | 2825 | /* |
7972aab2 DG |
2826 | * Create and send to the application the created buffers with per PID buffers. |
2827 | * | |
2828 | * Return 0 on success else a negative value. | |
78f0bacd | 2829 | */ |
7972aab2 DG |
2830 | static int create_channel_per_pid(struct ust_app *app, |
2831 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2832 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2833 | { |
8535a6d9 | 2834 | int ret; |
7972aab2 | 2835 | struct ust_registry_session *registry; |
78f0bacd | 2836 | |
7972aab2 DG |
2837 | assert(app); |
2838 | assert(usess); | |
2839 | assert(ua_sess); | |
2840 | assert(ua_chan); | |
2841 | ||
2842 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2843 | ||
2844 | rcu_read_lock(); | |
2845 | ||
2846 | registry = get_session_registry(ua_sess); | |
2847 | assert(registry); | |
2848 | ||
2849 | /* Create and add a new channel registry to session. */ | |
2850 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd | 2851 | if (ret < 0) { |
f14256d6 MD |
2852 | ERR("Error creating the UST channel \"%s\" registry instance", |
2853 | ua_chan->name); | |
78f0bacd DG |
2854 | goto error; |
2855 | } | |
2856 | ||
7972aab2 DG |
2857 | /* Create and get channel on the consumer side. */ |
2858 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2859 | app->bits_per_long, registry); | |
2860 | if (ret < 0) { | |
f14256d6 MD |
2861 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
2862 | ua_chan->name); | |
7972aab2 DG |
2863 | goto error; |
2864 | } | |
2865 | ||
2866 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
2867 | if (ret < 0) { | |
a7169585 MD |
2868 | if (ret != -ENOTCONN) { |
2869 | ERR("Error sending channel to application"); | |
2870 | } | |
7972aab2 DG |
2871 | goto error; |
2872 | } | |
8535a6d9 | 2873 | |
78f0bacd | 2874 | error: |
7972aab2 | 2875 | rcu_read_unlock(); |
78f0bacd DG |
2876 | return ret; |
2877 | } | |
2878 | ||
2879 | /* | |
7972aab2 DG |
2880 | * From an already allocated ust app channel, create the channel buffers if |
2881 | * need and send it to the application. This MUST be called with a RCU read | |
2882 | * side lock acquired. | |
2883 | * | |
a7169585 MD |
2884 | * Return 0 on success or else a negative value. Returns -ENOTCONN if |
2885 | * the application exited concurrently. | |
78f0bacd | 2886 | */ |
7972aab2 DG |
2887 | static int do_create_channel(struct ust_app *app, |
2888 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2889 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2890 | { |
7972aab2 | 2891 | int ret; |
78f0bacd | 2892 | |
7972aab2 DG |
2893 | assert(app); |
2894 | assert(usess); | |
2895 | assert(ua_sess); | |
2896 | assert(ua_chan); | |
2897 | ||
2898 | /* Handle buffer type before sending the channel to the application. */ | |
2899 | switch (usess->buffer_type) { | |
2900 | case LTTNG_BUFFER_PER_UID: | |
2901 | { | |
2902 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
2903 | if (ret < 0) { | |
2904 | goto error; | |
2905 | } | |
2906 | break; | |
2907 | } | |
2908 | case LTTNG_BUFFER_PER_PID: | |
2909 | { | |
2910 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
2911 | if (ret < 0) { | |
2912 | goto error; | |
2913 | } | |
2914 | break; | |
2915 | } | |
2916 | default: | |
2917 | assert(0); | |
2918 | ret = -EINVAL; | |
78f0bacd DG |
2919 | goto error; |
2920 | } | |
2921 | ||
7972aab2 DG |
2922 | /* Initialize ust objd object using the received handle and add it. */ |
2923 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
2924 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 2925 | |
7972aab2 DG |
2926 | /* If channel is not enabled, disable it on the tracer */ |
2927 | if (!ua_chan->enabled) { | |
2928 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2929 | if (ret < 0) { | |
2930 | goto error; | |
2931 | } | |
78f0bacd DG |
2932 | } |
2933 | ||
2934 | error: | |
2935 | return ret; | |
2936 | } | |
2937 | ||
284d8f55 | 2938 | /* |
4d710ac2 DG |
2939 | * Create UST app channel and create it on the tracer. Set ua_chanp of the |
2940 | * newly created channel if not NULL. | |
d0b96690 | 2941 | * |
36b588ed | 2942 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 | 2943 | * |
a7169585 MD |
2944 | * Return 0 on success or else a negative value. Returns -ENOTCONN if |
2945 | * the application exited concurrently. | |
284d8f55 | 2946 | */ |
4d710ac2 DG |
2947 | static int create_ust_app_channel(struct ust_app_session *ua_sess, |
2948 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
7972aab2 | 2949 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 2950 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
2951 | { |
2952 | int ret = 0; | |
bec39940 DG |
2953 | struct lttng_ht_iter iter; |
2954 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
2955 | struct ust_app_channel *ua_chan; |
2956 | ||
2957 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
2958 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
2959 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 2960 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 2961 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 2962 | goto end; |
5b4a0ec0 DG |
2963 | } |
2964 | ||
d0b96690 | 2965 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
2966 | if (ua_chan == NULL) { |
2967 | /* Only malloc can fail here */ | |
4d710ac2 | 2968 | ret = -ENOMEM; |
094d1690 | 2969 | goto error_alloc; |
fc34caaa DG |
2970 | } |
2971 | shadow_copy_channel(ua_chan, uchan); | |
2972 | ||
ffe60014 DG |
2973 | /* Set channel type. */ |
2974 | ua_chan->attr.type = type; | |
2975 | ||
7972aab2 | 2976 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
5b4a0ec0 DG |
2977 | if (ret < 0) { |
2978 | goto error; | |
2979 | } | |
2980 | ||
fc34caaa | 2981 | DBG2("UST app create channel %s for PID %d completed", ua_chan->name, |
852d0037 | 2982 | app->pid); |
fc34caaa | 2983 | |
d0b96690 DG |
2984 | /* Only add the channel if successful on the tracer side. */ |
2985 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
2986 | ||
fc34caaa | 2987 | end: |
4d710ac2 DG |
2988 | if (ua_chanp) { |
2989 | *ua_chanp = ua_chan; | |
2990 | } | |
2991 | ||
2992 | /* Everything went well. */ | |
2993 | return 0; | |
5b4a0ec0 DG |
2994 | |
2995 | error: | |
d0b96690 | 2996 | delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app); |
094d1690 | 2997 | error_alloc: |
4d710ac2 | 2998 | return ret; |
5b4a0ec0 DG |
2999 | } |
3000 | ||
3001 | /* | |
3002 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
3003 | * |
3004 | * Called with ust app session mutex held. | |
5b4a0ec0 | 3005 | */ |
edb67388 DG |
3006 | static |
3007 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
3008 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
3009 | struct ust_app *app) | |
284d8f55 | 3010 | { |
edb67388 | 3011 | int ret = 0; |
5b4a0ec0 | 3012 | struct ust_app_event *ua_event; |
284d8f55 | 3013 | |
5b4a0ec0 | 3014 | /* Get event node */ |
18eace3b | 3015 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 3016 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 3017 | if (ua_event != NULL) { |
fc34caaa | 3018 | ret = -EEXIST; |
edb67388 DG |
3019 | goto end; |
3020 | } | |
5b4a0ec0 | 3021 | |
edb67388 DG |
3022 | /* Does not exist so create one */ |
3023 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); | |
3024 | if (ua_event == NULL) { | |
3025 | /* Only malloc can failed so something is really wrong */ | |
3026 | ret = -ENOMEM; | |
fc34caaa | 3027 | goto end; |
5b4a0ec0 | 3028 | } |
edb67388 | 3029 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 3030 | |
edb67388 | 3031 | /* Create it on the tracer side */ |
5b4a0ec0 | 3032 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 3033 | if (ret < 0) { |
fc34caaa | 3034 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 3035 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
3036 | goto error; |
3037 | } | |
3038 | ||
d0b96690 | 3039 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 3040 | |
fc34caaa | 3041 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 3042 | app->pid); |
7f79d3a1 | 3043 | |
edb67388 | 3044 | end: |
fc34caaa DG |
3045 | return ret; |
3046 | ||
5b4a0ec0 | 3047 | error: |
fc34caaa | 3048 | /* Valid. Calling here is already in a read side lock */ |
fb45065e | 3049 | delete_ust_app_event(-1, ua_event, app); |
edb67388 | 3050 | return ret; |
5b4a0ec0 DG |
3051 | } |
3052 | ||
3053 | /* | |
3054 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 3055 | * |
7972aab2 | 3056 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
3057 | */ |
3058 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
ad7a9107 | 3059 | struct ust_app *app, struct consumer_output *consumer) |
5b4a0ec0 DG |
3060 | { |
3061 | int ret = 0; | |
ffe60014 | 3062 | struct ust_app_channel *metadata; |
d88aee68 | 3063 | struct consumer_socket *socket; |
7972aab2 | 3064 | struct ust_registry_session *registry; |
5b4a0ec0 | 3065 | |
ffe60014 DG |
3066 | assert(ua_sess); |
3067 | assert(app); | |
d88aee68 | 3068 | assert(consumer); |
5b4a0ec0 | 3069 | |
7972aab2 DG |
3070 | registry = get_session_registry(ua_sess); |
3071 | assert(registry); | |
3072 | ||
ce34fcd0 MD |
3073 | pthread_mutex_lock(®istry->lock); |
3074 | ||
1b532a60 DG |
3075 | /* Metadata already exists for this registry or it was closed previously */ |
3076 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
3077 | ret = 0; |
3078 | goto error; | |
5b4a0ec0 DG |
3079 | } |
3080 | ||
ffe60014 | 3081 | /* Allocate UST metadata */ |
d0b96690 | 3082 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
3083 | if (!metadata) { |
3084 | /* malloc() failed */ | |
3085 | ret = -ENOMEM; | |
3086 | goto error; | |
3087 | } | |
5b4a0ec0 | 3088 | |
ad7a9107 | 3089 | memcpy(&metadata->attr, &ua_sess->metadata_attr, sizeof(metadata->attr)); |
5b4a0ec0 | 3090 | |
7972aab2 DG |
3091 | /* Need one fd for the channel. */ |
3092 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
3093 | if (ret < 0) { | |
3094 | ERR("Exhausted number of available FD upon create metadata"); | |
3095 | goto error; | |
3096 | } | |
3097 | ||
4dc3dfc5 DG |
3098 | /* Get the right consumer socket for the application. */ |
3099 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
3100 | if (!socket) { | |
3101 | ret = -EINVAL; | |
3102 | goto error_consumer; | |
3103 | } | |
3104 | ||
331744e3 JD |
3105 | /* |
3106 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
3107 | * to the registry *before* we ask the consumer so we avoid the race of the | |
3108 | * consumer requesting the metadata and the ask_channel call on our side | |
3109 | * did not returned yet. | |
3110 | */ | |
3111 | registry->metadata_key = metadata->key; | |
3112 | ||
d88aee68 DG |
3113 | /* |
3114 | * Ask the metadata channel creation to the consumer. The metadata object | |
3115 | * will be created by the consumer and kept their. However, the stream is | |
3116 | * never added or monitored until we do a first push metadata to the | |
3117 | * consumer. | |
3118 | */ | |
7972aab2 DG |
3119 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
3120 | registry); | |
d88aee68 | 3121 | if (ret < 0) { |
f2a444f1 DG |
3122 | /* Nullify the metadata key so we don't try to close it later on. */ |
3123 | registry->metadata_key = 0; | |
d88aee68 DG |
3124 | goto error_consumer; |
3125 | } | |
3126 | ||
3127 | /* | |
3128 | * The setup command will make the metadata stream be sent to the relayd, | |
3129 | * if applicable, and the thread managing the metadatas. This is important | |
3130 | * because after this point, if an error occurs, the only way the stream | |
3131 | * can be deleted is to be monitored in the consumer. | |
3132 | */ | |
7972aab2 | 3133 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 3134 | if (ret < 0) { |
f2a444f1 DG |
3135 | /* Nullify the metadata key so we don't try to close it later on. */ |
3136 | registry->metadata_key = 0; | |
d88aee68 | 3137 | goto error_consumer; |
5b4a0ec0 DG |
3138 | } |
3139 | ||
7972aab2 DG |
3140 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
3141 | metadata->key, app->pid); | |
5b4a0ec0 | 3142 | |
d88aee68 | 3143 | error_consumer: |
b80f0b6c | 3144 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 3145 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 3146 | error: |
ce34fcd0 | 3147 | pthread_mutex_unlock(®istry->lock); |
ffe60014 | 3148 | return ret; |
5b4a0ec0 DG |
3149 | } |
3150 | ||
5b4a0ec0 | 3151 | /* |
d88aee68 DG |
3152 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
3153 | * acquired before calling this function. | |
5b4a0ec0 DG |
3154 | */ |
3155 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
3156 | { | |
d88aee68 | 3157 | struct ust_app *app = NULL; |
bec39940 DG |
3158 | struct lttng_ht_node_ulong *node; |
3159 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 3160 | |
bec39940 DG |
3161 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
3162 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
3163 | if (node == NULL) { |
3164 | DBG2("UST app no found with pid %d", pid); | |
3165 | goto error; | |
3166 | } | |
5b4a0ec0 DG |
3167 | |
3168 | DBG2("Found UST app by pid %d", pid); | |
3169 | ||
d88aee68 | 3170 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
3171 | |
3172 | error: | |
d88aee68 | 3173 | return app; |
5b4a0ec0 DG |
3174 | } |
3175 | ||
d88aee68 DG |
3176 | /* |
3177 | * Allocate and init an UST app object using the registration information and | |
3178 | * the command socket. This is called when the command socket connects to the | |
3179 | * session daemon. | |
3180 | * | |
3181 | * The object is returned on success or else NULL. | |
3182 | */ | |
d0b96690 | 3183 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 3184 | { |
d0b96690 DG |
3185 | struct ust_app *lta = NULL; |
3186 | ||
3187 | assert(msg); | |
3188 | assert(sock >= 0); | |
3189 | ||
3190 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 3191 | |
173af62f DG |
3192 | if ((msg->bits_per_long == 64 && |
3193 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
3194 | || (msg->bits_per_long == 32 && | |
3195 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 3196 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
3197 | "%d-bit long, but no consumerd for this size is available.\n", |
3198 | msg->name, msg->pid, msg->bits_per_long); | |
3199 | goto error; | |
3f2c5fcc | 3200 | } |
d0b96690 | 3201 | |
5b4a0ec0 DG |
3202 | lta = zmalloc(sizeof(struct ust_app)); |
3203 | if (lta == NULL) { | |
3204 | PERROR("malloc"); | |
d0b96690 | 3205 | goto error; |
5b4a0ec0 DG |
3206 | } |
3207 | ||
3208 | lta->ppid = msg->ppid; | |
3209 | lta->uid = msg->uid; | |
3210 | lta->gid = msg->gid; | |
d0b96690 | 3211 | |
7753dea8 | 3212 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
3213 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
3214 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
3215 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
3216 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
3217 | lta->long_alignment = msg->long_alignment; | |
3218 | lta->byte_order = msg->byte_order; | |
3219 | ||
5b4a0ec0 DG |
3220 | lta->v_major = msg->major; |
3221 | lta->v_minor = msg->minor; | |
d9bf3ca4 | 3222 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 | 3223 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
10b56aef | 3224 | lta->ust_sessions_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3225 | lta->notify_sock = -1; |
d88aee68 DG |
3226 | |
3227 | /* Copy name and make sure it's NULL terminated. */ | |
3228 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
3229 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
3230 | ||
3231 | /* | |
3232 | * Before this can be called, when receiving the registration information, | |
3233 | * the application compatibility is checked. So, at this point, the | |
3234 | * application can work with this session daemon. | |
3235 | */ | |
d0b96690 | 3236 | lta->compatible = 1; |
5b4a0ec0 | 3237 | |
852d0037 | 3238 | lta->pid = msg->pid; |
d0b96690 | 3239 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 3240 | lta->sock = sock; |
fb45065e | 3241 | pthread_mutex_init(<a->sock_lock, NULL); |
d0b96690 | 3242 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 3243 | |
d42f20df | 3244 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
d0b96690 DG |
3245 | error: |
3246 | return lta; | |
3247 | } | |
3248 | ||
d88aee68 DG |
3249 | /* |
3250 | * For a given application object, add it to every hash table. | |
3251 | */ | |
d0b96690 DG |
3252 | void ust_app_add(struct ust_app *app) |
3253 | { | |
3254 | assert(app); | |
3255 | assert(app->notify_sock >= 0); | |
3256 | ||
5b4a0ec0 | 3257 | rcu_read_lock(); |
852d0037 DG |
3258 | |
3259 | /* | |
3260 | * On a re-registration, we want to kick out the previous registration of | |
3261 | * that pid | |
3262 | */ | |
d0b96690 | 3263 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
3264 | |
3265 | /* | |
3266 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
3267 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
3268 | * already in the table. | |
3269 | */ | |
d0b96690 | 3270 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 3271 | |
d0b96690 DG |
3272 | /* Add application to the notify socket hash table. */ |
3273 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
3274 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 3275 | |
d0b96690 | 3276 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
3277 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
3278 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
3279 | app->v_minor); | |
5b4a0ec0 | 3280 | |
d0b96690 DG |
3281 | rcu_read_unlock(); |
3282 | } | |
3283 | ||
d88aee68 DG |
3284 | /* |
3285 | * Set the application version into the object. | |
3286 | * | |
3287 | * Return 0 on success else a negative value either an errno code or a | |
3288 | * LTTng-UST error code. | |
3289 | */ | |
d0b96690 DG |
3290 | int ust_app_version(struct ust_app *app) |
3291 | { | |
d88aee68 DG |
3292 | int ret; |
3293 | ||
d0b96690 | 3294 | assert(app); |
d88aee68 | 3295 | |
fb45065e | 3296 | pthread_mutex_lock(&app->sock_lock); |
d88aee68 | 3297 | ret = ustctl_tracer_version(app->sock, &app->version); |
fb45065e | 3298 | pthread_mutex_unlock(&app->sock_lock); |
d88aee68 DG |
3299 | if (ret < 0) { |
3300 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
5368d366 | 3301 | ERR("UST app %d version failed with ret %d", app->sock, ret); |
d88aee68 | 3302 | } else { |
5368d366 | 3303 | DBG3("UST app %d version failed. Application is dead", app->sock); |
d88aee68 DG |
3304 | } |
3305 | } | |
3306 | ||
3307 | return ret; | |
5b4a0ec0 DG |
3308 | } |
3309 | ||
3310 | /* | |
3311 | * Unregister app by removing it from the global traceable app list and freeing | |
3312 | * the data struct. | |
3313 | * | |
3314 | * The socket is already closed at this point so no close to sock. | |
3315 | */ | |
3316 | void ust_app_unregister(int sock) | |
3317 | { | |
3318 | struct ust_app *lta; | |
bec39940 | 3319 | struct lttng_ht_node_ulong *node; |
c4b88406 | 3320 | struct lttng_ht_iter ust_app_sock_iter; |
bec39940 | 3321 | struct lttng_ht_iter iter; |
d42f20df | 3322 | struct ust_app_session *ua_sess; |
525b0740 | 3323 | int ret; |
5b4a0ec0 DG |
3324 | |
3325 | rcu_read_lock(); | |
886459c6 | 3326 | |
5b4a0ec0 | 3327 | /* Get the node reference for a call_rcu */ |
c4b88406 MD |
3328 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &ust_app_sock_iter); |
3329 | node = lttng_ht_iter_get_node_ulong(&ust_app_sock_iter); | |
d0b96690 | 3330 | assert(node); |
284d8f55 | 3331 | |
852d0037 | 3332 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
3333 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
3334 | ||
d88aee68 | 3335 | /* |
ce34fcd0 MD |
3336 | * For per-PID buffers, perform "push metadata" and flush all |
3337 | * application streams before removing app from hash tables, | |
3338 | * ensuring proper behavior of data_pending check. | |
c4b88406 | 3339 | * Remove sessions so they are not visible during deletion. |
d88aee68 | 3340 | */ |
d42f20df DG |
3341 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, |
3342 | node.node) { | |
7972aab2 DG |
3343 | struct ust_registry_session *registry; |
3344 | ||
d42f20df DG |
3345 | ret = lttng_ht_del(lta->sessions, &iter); |
3346 | if (ret) { | |
3347 | /* The session was already removed so scheduled for teardown. */ | |
3348 | continue; | |
3349 | } | |
3350 | ||
ce34fcd0 MD |
3351 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { |
3352 | (void) ust_app_flush_app_session(lta, ua_sess); | |
3353 | } | |
c4b88406 | 3354 | |
d42f20df DG |
3355 | /* |
3356 | * Add session to list for teardown. This is safe since at this point we | |
3357 | * are the only one using this list. | |
3358 | */ | |
d88aee68 DG |
3359 | pthread_mutex_lock(&ua_sess->lock); |
3360 | ||
b161602a MD |
3361 | if (ua_sess->deleted) { |
3362 | pthread_mutex_unlock(&ua_sess->lock); | |
3363 | continue; | |
3364 | } | |
3365 | ||
d88aee68 DG |
3366 | /* |
3367 | * Normally, this is done in the delete session process which is | |
3368 | * executed in the call rcu below. However, upon registration we can't | |
3369 | * afford to wait for the grace period before pushing data or else the | |
3370 | * data pending feature can race between the unregistration and stop | |
3371 | * command where the data pending command is sent *before* the grace | |
3372 | * period ended. | |
3373 | * | |
3374 | * The close metadata below nullifies the metadata pointer in the | |
3375 | * session so the delete session will NOT push/close a second time. | |
3376 | */ | |
7972aab2 | 3377 | registry = get_session_registry(ua_sess); |
ce34fcd0 | 3378 | if (registry) { |
7972aab2 DG |
3379 | /* Push metadata for application before freeing the application. */ |
3380 | (void) push_metadata(registry, ua_sess->consumer); | |
3381 | ||
3382 | /* | |
3383 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
3384 | * metadata only on destroy trace session in this case. Also, the |
3385 | * previous push metadata could have flag the metadata registry to | |
3386 | * close so don't send a close command if closed. | |
7972aab2 | 3387 | */ |
ce34fcd0 | 3388 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
3389 | /* And ask to close it for this session registry. */ |
3390 | (void) close_metadata(registry, ua_sess->consumer); | |
3391 | } | |
3392 | } | |
d42f20df | 3393 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
c4b88406 | 3394 | |
d88aee68 | 3395 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
3396 | } |
3397 | ||
c4b88406 MD |
3398 | /* Remove application from PID hash table */ |
3399 | ret = lttng_ht_del(ust_app_ht_by_sock, &ust_app_sock_iter); | |
3400 | assert(!ret); | |
3401 | ||
3402 | /* | |
3403 | * Remove application from notify hash table. The thread handling the | |
3404 | * notify socket could have deleted the node so ignore on error because | |
3405 | * either way it's valid. The close of that socket is handled by the other | |
3406 | * thread. | |
3407 | */ | |
3408 | iter.iter.node = <a->notify_sock_n.node; | |
3409 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3410 | ||
3411 | /* | |
3412 | * Ignore return value since the node might have been removed before by an | |
3413 | * add replace during app registration because the PID can be reassigned by | |
3414 | * the OS. | |
3415 | */ | |
3416 | iter.iter.node = <a->pid_n.node; | |
3417 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3418 | if (ret) { | |
3419 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
3420 | lta->pid); | |
3421 | } | |
3422 | ||
852d0037 DG |
3423 | /* Free memory */ |
3424 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
3425 | ||
5b4a0ec0 DG |
3426 | rcu_read_unlock(); |
3427 | return; | |
284d8f55 DG |
3428 | } |
3429 | ||
5b4a0ec0 DG |
3430 | /* |
3431 | * Fill events array with all events name of all registered apps. | |
3432 | */ | |
3433 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 3434 | { |
5b4a0ec0 DG |
3435 | int ret, handle; |
3436 | size_t nbmem, count = 0; | |
bec39940 | 3437 | struct lttng_ht_iter iter; |
5b4a0ec0 | 3438 | struct ust_app *app; |
c617c0c6 | 3439 | struct lttng_event *tmp_event; |
421cb601 | 3440 | |
5b4a0ec0 | 3441 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
3442 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
3443 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
3444 | PERROR("zmalloc ust app events"); |
3445 | ret = -ENOMEM; | |
421cb601 DG |
3446 | goto error; |
3447 | } | |
3448 | ||
5b4a0ec0 | 3449 | rcu_read_lock(); |
421cb601 | 3450 | |
852d0037 | 3451 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 3452 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 3453 | |
840cb59c | 3454 | health_code_update(); |
86acf0da | 3455 | |
e0c7ec2b DG |
3456 | if (!app->compatible) { |
3457 | /* | |
3458 | * TODO: In time, we should notice the caller of this error by | |
3459 | * telling him that this is a version error. | |
3460 | */ | |
3461 | continue; | |
3462 | } | |
fb45065e | 3463 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 3464 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 3465 | if (handle < 0) { |
ffe60014 DG |
3466 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3467 | ERR("UST app list events getting handle failed for app pid %d", | |
3468 | app->pid); | |
3469 | } | |
fb45065e | 3470 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 DG |
3471 | continue; |
3472 | } | |
421cb601 | 3473 | |
852d0037 | 3474 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 3475 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3476 | /* Handle ustctl error. */ |
3477 | if (ret < 0) { | |
fb45065e MD |
3478 | int release_ret; |
3479 | ||
a2ba1ab0 | 3480 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3481 | ERR("UST app tp list get failed for app %d with ret %d", |
3482 | app->sock, ret); | |
3483 | } else { | |
3484 | DBG3("UST app tp list get failed. Application is dead"); | |
3757b385 DG |
3485 | /* |
3486 | * This is normal behavior, an application can die during the | |
3487 | * creation process. Don't report an error so the execution can | |
3488 | * continue normally. Continue normal execution. | |
3489 | */ | |
3490 | break; | |
ffe60014 | 3491 | } |
98f595d4 | 3492 | free(tmp_event); |
fb45065e | 3493 | release_ret = ustctl_release_handle(app->sock, handle); |
68313703 JG |
3494 | if (release_ret < 0 && |
3495 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3496 | release_ret != -EPIPE) { | |
fb45065e MD |
3497 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3498 | } | |
3499 | pthread_mutex_unlock(&app->sock_lock); | |
ffe60014 DG |
3500 | goto rcu_error; |
3501 | } | |
3502 | ||
840cb59c | 3503 | health_code_update(); |
815564d8 | 3504 | if (count >= nbmem) { |
d7b3776f | 3505 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3506 | struct lttng_event *new_tmp_event; |
3507 | size_t new_nbmem; | |
3508 | ||
3509 | new_nbmem = nbmem << 1; | |
3510 | DBG2("Reallocating event list from %zu to %zu entries", | |
3511 | nbmem, new_nbmem); | |
3512 | new_tmp_event = realloc(tmp_event, | |
3513 | new_nbmem * sizeof(struct lttng_event)); | |
3514 | if (new_tmp_event == NULL) { | |
fb45065e MD |
3515 | int release_ret; |
3516 | ||
5b4a0ec0 | 3517 | PERROR("realloc ust app events"); |
c617c0c6 | 3518 | free(tmp_event); |
5b4a0ec0 | 3519 | ret = -ENOMEM; |
fb45065e | 3520 | release_ret = ustctl_release_handle(app->sock, handle); |
68313703 JG |
3521 | if (release_ret < 0 && |
3522 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3523 | release_ret != -EPIPE) { | |
fb45065e MD |
3524 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3525 | } | |
3526 | pthread_mutex_unlock(&app->sock_lock); | |
5b4a0ec0 DG |
3527 | goto rcu_error; |
3528 | } | |
53efb85a MD |
3529 | /* Zero the new memory */ |
3530 | memset(new_tmp_event + nbmem, 0, | |
3531 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
3532 | nbmem = new_nbmem; | |
3533 | tmp_event = new_tmp_event; | |
5b4a0ec0 | 3534 | } |
c617c0c6 MD |
3535 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
3536 | tmp_event[count].loglevel = uiter.loglevel; | |
3537 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
3538 | tmp_event[count].pid = app->pid; | |
3539 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 3540 | count++; |
421cb601 | 3541 | } |
fb45065e MD |
3542 | ret = ustctl_release_handle(app->sock, handle); |
3543 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 | 3544 | if (ret < 0 && ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
fb45065e MD |
3545 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
3546 | } | |
421cb601 DG |
3547 | } |
3548 | ||
5b4a0ec0 | 3549 | ret = count; |
c617c0c6 | 3550 | *events = tmp_event; |
421cb601 | 3551 | |
5b4a0ec0 | 3552 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 3553 | |
5b4a0ec0 DG |
3554 | rcu_error: |
3555 | rcu_read_unlock(); | |
421cb601 | 3556 | error: |
840cb59c | 3557 | health_code_update(); |
5b4a0ec0 | 3558 | return ret; |
421cb601 DG |
3559 | } |
3560 | ||
f37d259d MD |
3561 | /* |
3562 | * Fill events array with all events name of all registered apps. | |
3563 | */ | |
3564 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
3565 | { | |
3566 | int ret, handle; | |
3567 | size_t nbmem, count = 0; | |
3568 | struct lttng_ht_iter iter; | |
3569 | struct ust_app *app; | |
c617c0c6 | 3570 | struct lttng_event_field *tmp_event; |
f37d259d MD |
3571 | |
3572 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
3573 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
3574 | if (tmp_event == NULL) { | |
f37d259d MD |
3575 | PERROR("zmalloc ust app event fields"); |
3576 | ret = -ENOMEM; | |
3577 | goto error; | |
3578 | } | |
3579 | ||
3580 | rcu_read_lock(); | |
3581 | ||
3582 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3583 | struct lttng_ust_field_iter uiter; | |
3584 | ||
840cb59c | 3585 | health_code_update(); |
86acf0da | 3586 | |
f37d259d MD |
3587 | if (!app->compatible) { |
3588 | /* | |
3589 | * TODO: In time, we should notice the caller of this error by | |
3590 | * telling him that this is a version error. | |
3591 | */ | |
3592 | continue; | |
3593 | } | |
fb45065e | 3594 | pthread_mutex_lock(&app->sock_lock); |
f37d259d MD |
3595 | handle = ustctl_tracepoint_field_list(app->sock); |
3596 | if (handle < 0) { | |
ffe60014 DG |
3597 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3598 | ERR("UST app list field getting handle failed for app pid %d", | |
3599 | app->pid); | |
3600 | } | |
fb45065e | 3601 | pthread_mutex_unlock(&app->sock_lock); |
f37d259d MD |
3602 | continue; |
3603 | } | |
3604 | ||
3605 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 3606 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3607 | /* Handle ustctl error. */ |
3608 | if (ret < 0) { | |
fb45065e MD |
3609 | int release_ret; |
3610 | ||
a2ba1ab0 | 3611 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3612 | ERR("UST app tp list field failed for app %d with ret %d", |
3613 | app->sock, ret); | |
3614 | } else { | |
3615 | DBG3("UST app tp list field failed. Application is dead"); | |
3757b385 DG |
3616 | /* |
3617 | * This is normal behavior, an application can die during the | |
3618 | * creation process. Don't report an error so the execution can | |
98f595d4 | 3619 | * continue normally. Reset list and count for next app. |
3757b385 DG |
3620 | */ |
3621 | break; | |
ffe60014 | 3622 | } |
98f595d4 | 3623 | free(tmp_event); |
fb45065e MD |
3624 | release_ret = ustctl_release_handle(app->sock, handle); |
3625 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
3626 | if (release_ret < 0 && |
3627 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3628 | release_ret != -EPIPE) { | |
fb45065e MD |
3629 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3630 | } | |
ffe60014 DG |
3631 | goto rcu_error; |
3632 | } | |
3633 | ||
840cb59c | 3634 | health_code_update(); |
f37d259d | 3635 | if (count >= nbmem) { |
d7b3776f | 3636 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3637 | struct lttng_event_field *new_tmp_event; |
3638 | size_t new_nbmem; | |
3639 | ||
3640 | new_nbmem = nbmem << 1; | |
3641 | DBG2("Reallocating event field list from %zu to %zu entries", | |
3642 | nbmem, new_nbmem); | |
3643 | new_tmp_event = realloc(tmp_event, | |
3644 | new_nbmem * sizeof(struct lttng_event_field)); | |
3645 | if (new_tmp_event == NULL) { | |
fb45065e MD |
3646 | int release_ret; |
3647 | ||
f37d259d | 3648 | PERROR("realloc ust app event fields"); |
c617c0c6 | 3649 | free(tmp_event); |
f37d259d | 3650 | ret = -ENOMEM; |
fb45065e MD |
3651 | release_ret = ustctl_release_handle(app->sock, handle); |
3652 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
3653 | if (release_ret && |
3654 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3655 | release_ret != -EPIPE) { | |
fb45065e MD |
3656 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3657 | } | |
f37d259d MD |
3658 | goto rcu_error; |
3659 | } | |
53efb85a MD |
3660 | /* Zero the new memory */ |
3661 | memset(new_tmp_event + nbmem, 0, | |
3662 | (new_nbmem - nbmem) * sizeof(struct lttng_event_field)); | |
3663 | nbmem = new_nbmem; | |
3664 | tmp_event = new_tmp_event; | |
f37d259d | 3665 | } |
f37d259d | 3666 | |
c617c0c6 | 3667 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
2e84128e DG |
3668 | /* Mapping between these enums matches 1 to 1. */ |
3669 | tmp_event[count].type = (enum lttng_event_field_type) uiter.type; | |
c617c0c6 | 3670 | tmp_event[count].nowrite = uiter.nowrite; |
f37d259d | 3671 | |
c617c0c6 MD |
3672 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
3673 | tmp_event[count].event.loglevel = uiter.loglevel; | |
2e84128e | 3674 | tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; |
c617c0c6 MD |
3675 | tmp_event[count].event.pid = app->pid; |
3676 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
3677 | count++; |
3678 | } | |
fb45065e MD |
3679 | ret = ustctl_release_handle(app->sock, handle); |
3680 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
3681 | if (ret < 0 && |
3682 | ret != -LTTNG_UST_ERR_EXITING && | |
3683 | ret != -EPIPE) { | |
fb45065e MD |
3684 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
3685 | } | |
f37d259d MD |
3686 | } |
3687 | ||
3688 | ret = count; | |
c617c0c6 | 3689 | *fields = tmp_event; |
f37d259d MD |
3690 | |
3691 | DBG2("UST app list event fields done (%zu events)", count); | |
3692 | ||
3693 | rcu_error: | |
3694 | rcu_read_unlock(); | |
3695 | error: | |
840cb59c | 3696 | health_code_update(); |
f37d259d MD |
3697 | return ret; |
3698 | } | |
3699 | ||
5b4a0ec0 DG |
3700 | /* |
3701 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
3702 | * |
3703 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
3704 | */ |
3705 | void ust_app_clean_list(void) | |
421cb601 | 3706 | { |
5b4a0ec0 | 3707 | int ret; |
659ed79f | 3708 | struct ust_app *app; |
bec39940 | 3709 | struct lttng_ht_iter iter; |
421cb601 | 3710 | |
5b4a0ec0 | 3711 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3712 | |
5b4a0ec0 | 3713 | rcu_read_lock(); |
421cb601 | 3714 | |
f1b711c4 MD |
3715 | if (ust_app_ht) { |
3716 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3717 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3718 | assert(!ret); | |
3719 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
3720 | } | |
421cb601 DG |
3721 | } |
3722 | ||
852d0037 | 3723 | /* Cleanup socket hash table */ |
f1b711c4 MD |
3724 | if (ust_app_ht_by_sock) { |
3725 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, | |
3726 | sock_n.node) { | |
3727 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); | |
3728 | assert(!ret); | |
3729 | } | |
bec39940 | 3730 | } |
852d0037 | 3731 | |
d88aee68 | 3732 | /* Cleanup notify socket hash table */ |
f1b711c4 MD |
3733 | if (ust_app_ht_by_notify_sock) { |
3734 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3735 | notify_sock_n.node) { | |
3736 | ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3737 | assert(!ret); | |
3738 | } | |
d88aee68 | 3739 | } |
36b588ed | 3740 | rcu_read_unlock(); |
d88aee68 | 3741 | |
bec39940 | 3742 | /* Destroy is done only when the ht is empty */ |
f1b711c4 MD |
3743 | if (ust_app_ht) { |
3744 | ht_cleanup_push(ust_app_ht); | |
3745 | } | |
3746 | if (ust_app_ht_by_sock) { | |
3747 | ht_cleanup_push(ust_app_ht_by_sock); | |
3748 | } | |
3749 | if (ust_app_ht_by_notify_sock) { | |
3750 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
3751 | } | |
5b4a0ec0 DG |
3752 | } |
3753 | ||
3754 | /* | |
3755 | * Init UST app hash table. | |
3756 | */ | |
57703f6e | 3757 | int ust_app_ht_alloc(void) |
5b4a0ec0 | 3758 | { |
bec39940 | 3759 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3760 | if (!ust_app_ht) { |
3761 | return -1; | |
3762 | } | |
852d0037 | 3763 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3764 | if (!ust_app_ht_by_sock) { |
3765 | return -1; | |
3766 | } | |
d0b96690 | 3767 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3768 | if (!ust_app_ht_by_notify_sock) { |
3769 | return -1; | |
3770 | } | |
3771 | return 0; | |
421cb601 DG |
3772 | } |
3773 | ||
78f0bacd DG |
3774 | /* |
3775 | * For a specific UST session, disable the channel for all registered apps. | |
3776 | */ | |
35a9059d | 3777 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3778 | struct ltt_ust_channel *uchan) |
3779 | { | |
3780 | int ret = 0; | |
bec39940 DG |
3781 | struct lttng_ht_iter iter; |
3782 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3783 | struct ust_app *app; |
3784 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3785 | struct ust_app_channel *ua_chan; |
78f0bacd DG |
3786 | |
3787 | if (usess == NULL || uchan == NULL) { | |
3788 | ERR("Disabling UST global channel with NULL values"); | |
3789 | ret = -1; | |
3790 | goto error; | |
3791 | } | |
3792 | ||
d9bf3ca4 | 3793 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 3794 | uchan->name, usess->id); |
78f0bacd DG |
3795 | |
3796 | rcu_read_lock(); | |
3797 | ||
3798 | /* For every registered applications */ | |
852d0037 | 3799 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3800 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3801 | if (!app->compatible) { |
3802 | /* | |
3803 | * TODO: In time, we should notice the caller of this error by | |
3804 | * telling him that this is a version error. | |
3805 | */ | |
3806 | continue; | |
3807 | } | |
78f0bacd DG |
3808 | ua_sess = lookup_session_by_app(usess, app); |
3809 | if (ua_sess == NULL) { | |
3810 | continue; | |
3811 | } | |
3812 | ||
8535a6d9 | 3813 | /* Get channel */ |
bec39940 DG |
3814 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3815 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
3816 | /* If the session if found for the app, the channel must be there */ |
3817 | assert(ua_chan_node); | |
3818 | ||
3819 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3820 | /* The channel must not be already disabled */ | |
3821 | assert(ua_chan->enabled == 1); | |
3822 | ||
3823 | /* Disable channel onto application */ | |
3824 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
3825 | if (ret < 0) { |
3826 | /* XXX: We might want to report this error at some point... */ | |
3827 | continue; | |
3828 | } | |
3829 | } | |
3830 | ||
3831 | rcu_read_unlock(); | |
3832 | ||
3833 | error: | |
3834 | return ret; | |
3835 | } | |
3836 | ||
3837 | /* | |
3838 | * For a specific UST session, enable the channel for all registered apps. | |
3839 | */ | |
35a9059d | 3840 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3841 | struct ltt_ust_channel *uchan) |
3842 | { | |
3843 | int ret = 0; | |
bec39940 | 3844 | struct lttng_ht_iter iter; |
78f0bacd DG |
3845 | struct ust_app *app; |
3846 | struct ust_app_session *ua_sess; | |
3847 | ||
3848 | if (usess == NULL || uchan == NULL) { | |
3849 | ERR("Adding UST global channel to NULL values"); | |
3850 | ret = -1; | |
3851 | goto error; | |
3852 | } | |
3853 | ||
d9bf3ca4 | 3854 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 3855 | uchan->name, usess->id); |
78f0bacd DG |
3856 | |
3857 | rcu_read_lock(); | |
3858 | ||
3859 | /* For every registered applications */ | |
852d0037 | 3860 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3861 | if (!app->compatible) { |
3862 | /* | |
3863 | * TODO: In time, we should notice the caller of this error by | |
3864 | * telling him that this is a version error. | |
3865 | */ | |
3866 | continue; | |
3867 | } | |
78f0bacd DG |
3868 | ua_sess = lookup_session_by_app(usess, app); |
3869 | if (ua_sess == NULL) { | |
3870 | continue; | |
3871 | } | |
3872 | ||
3873 | /* Enable channel onto application */ | |
3874 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
3875 | if (ret < 0) { | |
3876 | /* XXX: We might want to report this error at some point... */ | |
3877 | continue; | |
3878 | } | |
3879 | } | |
3880 | ||
3881 | rcu_read_unlock(); | |
3882 | ||
3883 | error: | |
3884 | return ret; | |
3885 | } | |
3886 | ||
b0a40d28 DG |
3887 | /* |
3888 | * Disable an event in a channel and for a specific session. | |
3889 | */ | |
35a9059d DG |
3890 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
3891 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
3892 | { |
3893 | int ret = 0; | |
bec39940 | 3894 | struct lttng_ht_iter iter, uiter; |
700c5a9d | 3895 | struct lttng_ht_node_str *ua_chan_node; |
b0a40d28 DG |
3896 | struct ust_app *app; |
3897 | struct ust_app_session *ua_sess; | |
3898 | struct ust_app_channel *ua_chan; | |
3899 | struct ust_app_event *ua_event; | |
3900 | ||
3901 | DBG("UST app disabling event %s for all apps in channel " | |
d9bf3ca4 MD |
3902 | "%s for session id %" PRIu64, |
3903 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
3904 | |
3905 | rcu_read_lock(); | |
3906 | ||
3907 | /* For all registered applications */ | |
852d0037 | 3908 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3909 | if (!app->compatible) { |
3910 | /* | |
3911 | * TODO: In time, we should notice the caller of this error by | |
3912 | * telling him that this is a version error. | |
3913 | */ | |
3914 | continue; | |
3915 | } | |
b0a40d28 DG |
3916 | ua_sess = lookup_session_by_app(usess, app); |
3917 | if (ua_sess == NULL) { | |
3918 | /* Next app */ | |
3919 | continue; | |
3920 | } | |
3921 | ||
3922 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3923 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3924 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 3925 | if (ua_chan_node == NULL) { |
d9bf3ca4 | 3926 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 3927 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
3928 | continue; |
3929 | } | |
3930 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3931 | ||
700c5a9d JR |
3932 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
3933 | uevent->filter, uevent->attr.loglevel, | |
3934 | uevent->exclusion); | |
3935 | if (ua_event == NULL) { | |
b0a40d28 | 3936 | DBG2("Event %s not found in channel %s for app pid %d." |
852d0037 | 3937 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
3938 | continue; |
3939 | } | |
b0a40d28 | 3940 | |
7f79d3a1 | 3941 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
3942 | if (ret < 0) { |
3943 | /* XXX: Report error someday... */ | |
3944 | continue; | |
3945 | } | |
3946 | } | |
3947 | ||
3948 | rcu_read_unlock(); | |
3949 | ||
3950 | return ret; | |
3951 | } | |
3952 | ||
421cb601 | 3953 | /* |
5b4a0ec0 | 3954 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 3955 | */ |
35a9059d | 3956 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3957 | struct ltt_ust_channel *uchan) |
3958 | { | |
3d8ca23b | 3959 | int ret = 0, created; |
bec39940 | 3960 | struct lttng_ht_iter iter; |
48842b30 | 3961 | struct ust_app *app; |
3d8ca23b | 3962 | struct ust_app_session *ua_sess = NULL; |
48842b30 | 3963 | |
fc34caaa DG |
3964 | /* Very wrong code flow */ |
3965 | assert(usess); | |
3966 | assert(uchan); | |
421cb601 | 3967 | |
d9bf3ca4 | 3968 | DBG2("UST app adding channel %s to UST domain for session id %" PRIu64, |
a991f516 | 3969 | uchan->name, usess->id); |
48842b30 DG |
3970 | |
3971 | rcu_read_lock(); | |
421cb601 | 3972 | |
5b4a0ec0 | 3973 | /* For every registered applications */ |
852d0037 | 3974 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3975 | if (!app->compatible) { |
3976 | /* | |
3977 | * TODO: In time, we should notice the caller of this error by | |
3978 | * telling him that this is a version error. | |
3979 | */ | |
3980 | continue; | |
3981 | } | |
a9ad0c8f MD |
3982 | if (!trace_ust_pid_tracker_lookup(usess, app->pid)) { |
3983 | /* Skip. */ | |
3984 | continue; | |
3985 | } | |
3986 | ||
edb67388 DG |
3987 | /* |
3988 | * Create session on the tracer side and add it to app session HT. Note | |
3989 | * that if session exist, it will simply return a pointer to the ust | |
3990 | * app session. | |
3991 | */ | |
3d8ca23b DG |
3992 | ret = create_ust_app_session(usess, app, &ua_sess, &created); |
3993 | if (ret < 0) { | |
3994 | switch (ret) { | |
3995 | case -ENOTCONN: | |
3996 | /* | |
3997 | * The application's socket is not valid. Either a bad socket | |
3998 | * or a timeout on it. We can't inform the caller that for a | |
3999 | * specific app, the session failed so lets continue here. | |
4000 | */ | |
a7169585 | 4001 | ret = 0; /* Not an error. */ |
3d8ca23b DG |
4002 | continue; |
4003 | case -ENOMEM: | |
4004 | default: | |
4005 | goto error_rcu_unlock; | |
4006 | } | |
48842b30 | 4007 | } |
3d8ca23b | 4008 | assert(ua_sess); |
48842b30 | 4009 | |
d0b96690 | 4010 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
4011 | |
4012 | if (ua_sess->deleted) { | |
4013 | pthread_mutex_unlock(&ua_sess->lock); | |
4014 | continue; | |
4015 | } | |
4016 | ||
d65d2de8 DG |
4017 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, |
4018 | sizeof(uchan->name))) { | |
ad7a9107 DG |
4019 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, &uchan->attr); |
4020 | ret = 0; | |
d65d2de8 DG |
4021 | } else { |
4022 | /* Create channel onto application. We don't need the chan ref. */ | |
4023 | ret = create_ust_app_channel(ua_sess, uchan, app, | |
4024 | LTTNG_UST_CHAN_PER_CPU, usess, NULL); | |
4025 | } | |
d0b96690 | 4026 | pthread_mutex_unlock(&ua_sess->lock); |
3d8ca23b | 4027 | if (ret < 0) { |
3d8ca23b DG |
4028 | /* Cleanup the created session if it's the case. */ |
4029 | if (created) { | |
d0b96690 | 4030 | destroy_app_session(app, ua_sess); |
3d8ca23b | 4031 | } |
a7169585 MD |
4032 | switch (ret) { |
4033 | case -ENOTCONN: | |
4034 | /* | |
4035 | * The application's socket is not valid. Either a bad socket | |
4036 | * or a timeout on it. We can't inform the caller that for a | |
4037 | * specific app, the session failed so lets continue here. | |
4038 | */ | |
4039 | ret = 0; /* Not an error. */ | |
4040 | continue; | |
4041 | case -ENOMEM: | |
4042 | default: | |
4043 | goto error_rcu_unlock; | |
4044 | } | |
48842b30 | 4045 | } |
48842b30 | 4046 | } |
5b4a0ec0 | 4047 | |
95e047ff | 4048 | error_rcu_unlock: |
48842b30 | 4049 | rcu_read_unlock(); |
3c14c33f | 4050 | return ret; |
48842b30 DG |
4051 | } |
4052 | ||
5b4a0ec0 | 4053 | /* |
edb67388 | 4054 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 4055 | */ |
35a9059d | 4056 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
4057 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4058 | { | |
4059 | int ret = 0; | |
bec39940 | 4060 | struct lttng_ht_iter iter, uiter; |
18eace3b | 4061 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
4062 | struct ust_app *app; |
4063 | struct ust_app_session *ua_sess; | |
4064 | struct ust_app_channel *ua_chan; | |
4065 | struct ust_app_event *ua_event; | |
48842b30 | 4066 | |
d9bf3ca4 | 4067 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 4068 | uevent->attr.name, usess->id); |
48842b30 | 4069 | |
edb67388 DG |
4070 | /* |
4071 | * NOTE: At this point, this function is called only if the session and | |
4072 | * channel passed are already created for all apps. and enabled on the | |
4073 | * tracer also. | |
4074 | */ | |
4075 | ||
48842b30 | 4076 | rcu_read_lock(); |
421cb601 DG |
4077 | |
4078 | /* For all registered applications */ | |
852d0037 | 4079 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4080 | if (!app->compatible) { |
4081 | /* | |
4082 | * TODO: In time, we should notice the caller of this error by | |
4083 | * telling him that this is a version error. | |
4084 | */ | |
4085 | continue; | |
4086 | } | |
edb67388 | 4087 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4088 | if (!ua_sess) { |
4089 | /* The application has problem or is probably dead. */ | |
4090 | continue; | |
4091 | } | |
ba767faf | 4092 | |
d0b96690 DG |
4093 | pthread_mutex_lock(&ua_sess->lock); |
4094 | ||
b161602a MD |
4095 | if (ua_sess->deleted) { |
4096 | pthread_mutex_unlock(&ua_sess->lock); | |
4097 | continue; | |
4098 | } | |
4099 | ||
edb67388 | 4100 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4101 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4102 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
a7169585 MD |
4103 | /* |
4104 | * It is possible that the channel cannot be found is | |
4105 | * the channel/event creation occurs concurrently with | |
4106 | * an application exit. | |
4107 | */ | |
4108 | if (!ua_chan_node) { | |
4109 | pthread_mutex_unlock(&ua_sess->lock); | |
4110 | continue; | |
4111 | } | |
edb67388 DG |
4112 | |
4113 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4114 | ||
18eace3b DG |
4115 | /* Get event node */ |
4116 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
39c5a3a7 | 4117 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 4118 | if (ua_event == NULL) { |
7f79d3a1 | 4119 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 4120 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 4121 | goto next_app; |
35a9059d | 4122 | } |
35a9059d DG |
4123 | |
4124 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
4125 | if (ret < 0) { | |
d0b96690 | 4126 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 4127 | goto error; |
48842b30 | 4128 | } |
d0b96690 DG |
4129 | next_app: |
4130 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
4131 | } |
4132 | ||
7f79d3a1 | 4133 | error: |
edb67388 | 4134 | rcu_read_unlock(); |
edb67388 DG |
4135 | return ret; |
4136 | } | |
4137 | ||
4138 | /* | |
4139 | * For a specific existing UST session and UST channel, creates the event for | |
4140 | * all registered apps. | |
4141 | */ | |
35a9059d | 4142 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
4143 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4144 | { | |
4145 | int ret = 0; | |
bec39940 DG |
4146 | struct lttng_ht_iter iter, uiter; |
4147 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
4148 | struct ust_app *app; |
4149 | struct ust_app_session *ua_sess; | |
4150 | struct ust_app_channel *ua_chan; | |
4151 | ||
d9bf3ca4 | 4152 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 4153 | uevent->attr.name, usess->id); |
edb67388 | 4154 | |
edb67388 DG |
4155 | rcu_read_lock(); |
4156 | ||
4157 | /* For all registered applications */ | |
852d0037 | 4158 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4159 | if (!app->compatible) { |
4160 | /* | |
4161 | * TODO: In time, we should notice the caller of this error by | |
4162 | * telling him that this is a version error. | |
4163 | */ | |
4164 | continue; | |
4165 | } | |
edb67388 | 4166 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4167 | if (!ua_sess) { |
4168 | /* The application has problem or is probably dead. */ | |
4169 | continue; | |
4170 | } | |
48842b30 | 4171 | |
d0b96690 | 4172 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
4173 | |
4174 | if (ua_sess->deleted) { | |
4175 | pthread_mutex_unlock(&ua_sess->lock); | |
4176 | continue; | |
4177 | } | |
4178 | ||
48842b30 | 4179 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4180 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4181 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
4182 | /* If the channel is not found, there is a code flow error */ |
4183 | assert(ua_chan_node); | |
4184 | ||
48842b30 DG |
4185 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
4186 | ||
edb67388 | 4187 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 4188 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 4189 | if (ret < 0) { |
49c336c1 | 4190 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
4191 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
4192 | break; | |
4193 | } | |
4194 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 4195 | uevent->attr.name, app->pid); |
5b4a0ec0 | 4196 | continue; |
48842b30 | 4197 | } |
48842b30 | 4198 | } |
5b4a0ec0 | 4199 | |
48842b30 DG |
4200 | rcu_read_unlock(); |
4201 | ||
4202 | return ret; | |
4203 | } | |
4204 | ||
5b4a0ec0 DG |
4205 | /* |
4206 | * Start tracing for a specific UST session and app. | |
4207 | */ | |
b34cbebf | 4208 | static |
421cb601 | 4209 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
4210 | { |
4211 | int ret = 0; | |
48842b30 | 4212 | struct ust_app_session *ua_sess; |
48842b30 | 4213 | |
852d0037 | 4214 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 4215 | |
509cbaf8 MD |
4216 | rcu_read_lock(); |
4217 | ||
e0c7ec2b DG |
4218 | if (!app->compatible) { |
4219 | goto end; | |
4220 | } | |
4221 | ||
421cb601 DG |
4222 | ua_sess = lookup_session_by_app(usess, app); |
4223 | if (ua_sess == NULL) { | |
d42f20df DG |
4224 | /* The session is in teardown process. Ignore and continue. */ |
4225 | goto end; | |
421cb601 | 4226 | } |
48842b30 | 4227 | |
d0b96690 DG |
4228 | pthread_mutex_lock(&ua_sess->lock); |
4229 | ||
b161602a MD |
4230 | if (ua_sess->deleted) { |
4231 | pthread_mutex_unlock(&ua_sess->lock); | |
4232 | goto end; | |
4233 | } | |
4234 | ||
aea829b3 DG |
4235 | /* Upon restart, we skip the setup, already done */ |
4236 | if (ua_sess->started) { | |
8be98f9a | 4237 | goto skip_setup; |
aea829b3 | 4238 | } |
8be98f9a | 4239 | |
a4b92340 DG |
4240 | /* Create directories if consumer is LOCAL and has a path defined. */ |
4241 | if (usess->consumer->type == CONSUMER_DST_LOCAL && | |
4242 | strlen(usess->consumer->dst.trace_path) > 0) { | |
4243 | ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path, | |
7972aab2 | 4244 | S_IRWXU | S_IRWXG, ua_sess->euid, ua_sess->egid); |
a4b92340 | 4245 | if (ret < 0) { |
df5b86c8 | 4246 | if (errno != EEXIST) { |
a4b92340 | 4247 | ERR("Trace directory creation error"); |
d0b96690 | 4248 | goto error_unlock; |
421cb601 | 4249 | } |
173af62f | 4250 | } |
7753dea8 | 4251 | } |
aea829b3 | 4252 | |
d65d2de8 DG |
4253 | /* |
4254 | * Create the metadata for the application. This returns gracefully if a | |
4255 | * metadata was already set for the session. | |
4256 | */ | |
ad7a9107 | 4257 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer); |
421cb601 | 4258 | if (ret < 0) { |
d0b96690 | 4259 | goto error_unlock; |
421cb601 | 4260 | } |
48842b30 | 4261 | |
840cb59c | 4262 | health_code_update(); |
86acf0da | 4263 | |
8be98f9a | 4264 | skip_setup: |
421cb601 | 4265 | /* This start the UST tracing */ |
fb45065e | 4266 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4267 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
fb45065e | 4268 | pthread_mutex_unlock(&app->sock_lock); |
421cb601 | 4269 | if (ret < 0) { |
ffe60014 DG |
4270 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4271 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
4272 | app->pid, ret); | |
4273 | } else { | |
4274 | DBG("UST app start session failed. Application is dead."); | |
3757b385 DG |
4275 | /* |
4276 | * This is normal behavior, an application can die during the | |
4277 | * creation process. Don't report an error so the execution can | |
4278 | * continue normally. | |
4279 | */ | |
4280 | pthread_mutex_unlock(&ua_sess->lock); | |
4281 | goto end; | |
ffe60014 | 4282 | } |
d0b96690 | 4283 | goto error_unlock; |
421cb601 | 4284 | } |
5b4a0ec0 | 4285 | |
55c3953d DG |
4286 | /* Indicate that the session has been started once */ |
4287 | ua_sess->started = 1; | |
4288 | ||
d0b96690 DG |
4289 | pthread_mutex_unlock(&ua_sess->lock); |
4290 | ||
840cb59c | 4291 | health_code_update(); |
86acf0da | 4292 | |
421cb601 | 4293 | /* Quiescent wait after starting trace */ |
fb45065e | 4294 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4295 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4296 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4297 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4298 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4299 | app->pid, ret); | |
4300 | } | |
48842b30 | 4301 | |
e0c7ec2b DG |
4302 | end: |
4303 | rcu_read_unlock(); | |
840cb59c | 4304 | health_code_update(); |
421cb601 | 4305 | return 0; |
48842b30 | 4306 | |
d0b96690 DG |
4307 | error_unlock: |
4308 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 4309 | rcu_read_unlock(); |
840cb59c | 4310 | health_code_update(); |
421cb601 DG |
4311 | return -1; |
4312 | } | |
48842b30 | 4313 | |
8be98f9a MD |
4314 | /* |
4315 | * Stop tracing for a specific UST session and app. | |
4316 | */ | |
b34cbebf | 4317 | static |
8be98f9a MD |
4318 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
4319 | { | |
4320 | int ret = 0; | |
4321 | struct ust_app_session *ua_sess; | |
7972aab2 | 4322 | struct ust_registry_session *registry; |
8be98f9a | 4323 | |
852d0037 | 4324 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
4325 | |
4326 | rcu_read_lock(); | |
4327 | ||
e0c7ec2b | 4328 | if (!app->compatible) { |
d88aee68 | 4329 | goto end_no_session; |
e0c7ec2b DG |
4330 | } |
4331 | ||
8be98f9a MD |
4332 | ua_sess = lookup_session_by_app(usess, app); |
4333 | if (ua_sess == NULL) { | |
d88aee68 | 4334 | goto end_no_session; |
8be98f9a MD |
4335 | } |
4336 | ||
d88aee68 DG |
4337 | pthread_mutex_lock(&ua_sess->lock); |
4338 | ||
b161602a MD |
4339 | if (ua_sess->deleted) { |
4340 | pthread_mutex_unlock(&ua_sess->lock); | |
4341 | goto end_no_session; | |
4342 | } | |
4343 | ||
9bc07046 DG |
4344 | /* |
4345 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
4346 | * that was never started. It's possible since we can have a fail start |
4347 | * from either the application manager thread or the command thread. Simply | |
4348 | * indicate that this is a stop error. | |
9bc07046 | 4349 | */ |
f9dfc3d9 | 4350 | if (!ua_sess->started) { |
c45536e1 DG |
4351 | goto error_rcu_unlock; |
4352 | } | |
7db205b5 | 4353 | |
840cb59c | 4354 | health_code_update(); |
86acf0da | 4355 | |
9d6c7d3f | 4356 | /* This inhibits UST tracing */ |
fb45065e | 4357 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4358 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
fb45065e | 4359 | pthread_mutex_unlock(&app->sock_lock); |
9d6c7d3f | 4360 | if (ret < 0) { |
ffe60014 DG |
4361 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4362 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
4363 | app->pid, ret); | |
4364 | } else { | |
4365 | DBG("UST app stop session failed. Application is dead."); | |
3757b385 DG |
4366 | /* |
4367 | * This is normal behavior, an application can die during the | |
4368 | * creation process. Don't report an error so the execution can | |
4369 | * continue normally. | |
4370 | */ | |
4371 | goto end_unlock; | |
ffe60014 | 4372 | } |
9d6c7d3f DG |
4373 | goto error_rcu_unlock; |
4374 | } | |
4375 | ||
840cb59c | 4376 | health_code_update(); |
86acf0da | 4377 | |
9d6c7d3f | 4378 | /* Quiescent wait after stopping trace */ |
fb45065e | 4379 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4380 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4381 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4382 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4383 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4384 | app->pid, ret); | |
4385 | } | |
9d6c7d3f | 4386 | |
840cb59c | 4387 | health_code_update(); |
86acf0da | 4388 | |
b34cbebf MD |
4389 | registry = get_session_registry(ua_sess); |
4390 | assert(registry); | |
1b532a60 | 4391 | |
ce34fcd0 MD |
4392 | /* Push metadata for application before freeing the application. */ |
4393 | (void) push_metadata(registry, ua_sess->consumer); | |
b34cbebf | 4394 | |
3757b385 | 4395 | end_unlock: |
b34cbebf MD |
4396 | pthread_mutex_unlock(&ua_sess->lock); |
4397 | end_no_session: | |
4398 | rcu_read_unlock(); | |
4399 | health_code_update(); | |
4400 | return 0; | |
4401 | ||
4402 | error_rcu_unlock: | |
4403 | pthread_mutex_unlock(&ua_sess->lock); | |
4404 | rcu_read_unlock(); | |
4405 | health_code_update(); | |
4406 | return -1; | |
4407 | } | |
4408 | ||
b34cbebf | 4409 | static |
c4b88406 MD |
4410 | int ust_app_flush_app_session(struct ust_app *app, |
4411 | struct ust_app_session *ua_sess) | |
b34cbebf | 4412 | { |
c4b88406 | 4413 | int ret, retval = 0; |
b34cbebf | 4414 | struct lttng_ht_iter iter; |
b34cbebf | 4415 | struct ust_app_channel *ua_chan; |
c4b88406 | 4416 | struct consumer_socket *socket; |
b34cbebf | 4417 | |
c4b88406 | 4418 | DBG("Flushing app session buffers for ust app pid %d", app->pid); |
b34cbebf MD |
4419 | |
4420 | rcu_read_lock(); | |
4421 | ||
4422 | if (!app->compatible) { | |
c4b88406 | 4423 | goto end_not_compatible; |
b34cbebf MD |
4424 | } |
4425 | ||
4426 | pthread_mutex_lock(&ua_sess->lock); | |
4427 | ||
b161602a MD |
4428 | if (ua_sess->deleted) { |
4429 | goto end_deleted; | |
4430 | } | |
4431 | ||
b34cbebf MD |
4432 | health_code_update(); |
4433 | ||
9d6c7d3f | 4434 | /* Flushing buffers */ |
c4b88406 MD |
4435 | socket = consumer_find_socket_by_bitness(app->bits_per_long, |
4436 | ua_sess->consumer); | |
ce34fcd0 MD |
4437 | |
4438 | /* Flush buffers and push metadata. */ | |
4439 | switch (ua_sess->buffer_type) { | |
4440 | case LTTNG_BUFFER_PER_PID: | |
4441 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, | |
4442 | node.node) { | |
4443 | health_code_update(); | |
4444 | assert(ua_chan->is_sent); | |
4445 | ret = consumer_flush_channel(socket, ua_chan->key); | |
4446 | if (ret) { | |
4447 | ERR("Error flushing consumer channel"); | |
4448 | retval = -1; | |
4449 | continue; | |
4450 | } | |
8be98f9a | 4451 | } |
ce34fcd0 MD |
4452 | break; |
4453 | case LTTNG_BUFFER_PER_UID: | |
4454 | default: | |
4455 | assert(0); | |
4456 | break; | |
8be98f9a | 4457 | } |
8be98f9a | 4458 | |
840cb59c | 4459 | health_code_update(); |
86acf0da | 4460 | |
b161602a | 4461 | end_deleted: |
d88aee68 | 4462 | pthread_mutex_unlock(&ua_sess->lock); |
ce34fcd0 | 4463 | |
c4b88406 MD |
4464 | end_not_compatible: |
4465 | rcu_read_unlock(); | |
4466 | health_code_update(); | |
4467 | return retval; | |
4468 | } | |
4469 | ||
4470 | /* | |
ce34fcd0 MD |
4471 | * Flush buffers for all applications for a specific UST session. |
4472 | * Called with UST session lock held. | |
c4b88406 MD |
4473 | */ |
4474 | static | |
ce34fcd0 | 4475 | int ust_app_flush_session(struct ltt_ust_session *usess) |
c4b88406 MD |
4476 | |
4477 | { | |
99b1411c | 4478 | int ret = 0; |
c4b88406 | 4479 | |
ce34fcd0 | 4480 | DBG("Flushing session buffers for all ust apps"); |
c4b88406 MD |
4481 | |
4482 | rcu_read_lock(); | |
4483 | ||
ce34fcd0 MD |
4484 | /* Flush buffers and push metadata. */ |
4485 | switch (usess->buffer_type) { | |
4486 | case LTTNG_BUFFER_PER_UID: | |
4487 | { | |
4488 | struct buffer_reg_uid *reg; | |
4489 | struct lttng_ht_iter iter; | |
4490 | ||
4491 | /* Flush all per UID buffers associated to that session. */ | |
4492 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
4493 | struct ust_registry_session *ust_session_reg; | |
4494 | struct buffer_reg_channel *reg_chan; | |
4495 | struct consumer_socket *socket; | |
4496 | ||
4497 | /* Get consumer socket to use to push the metadata.*/ | |
4498 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
4499 | usess->consumer); | |
4500 | if (!socket) { | |
4501 | /* Ignore request if no consumer is found for the session. */ | |
4502 | continue; | |
4503 | } | |
4504 | ||
4505 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
4506 | reg_chan, node.node) { | |
4507 | /* | |
4508 | * The following call will print error values so the return | |
4509 | * code is of little importance because whatever happens, we | |
4510 | * have to try them all. | |
4511 | */ | |
4512 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
4513 | } | |
4514 | ||
4515 | ust_session_reg = reg->registry->reg.ust; | |
4516 | /* Push metadata. */ | |
4517 | (void) push_metadata(ust_session_reg, usess->consumer); | |
4518 | } | |
ce34fcd0 MD |
4519 | break; |
4520 | } | |
4521 | case LTTNG_BUFFER_PER_PID: | |
4522 | { | |
4523 | struct ust_app_session *ua_sess; | |
4524 | struct lttng_ht_iter iter; | |
4525 | struct ust_app *app; | |
4526 | ||
4527 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4528 | ua_sess = lookup_session_by_app(usess, app); | |
4529 | if (ua_sess == NULL) { | |
4530 | continue; | |
4531 | } | |
4532 | (void) ust_app_flush_app_session(app, ua_sess); | |
4533 | } | |
4534 | break; | |
4535 | } | |
4536 | default: | |
99b1411c | 4537 | ret = -1; |
ce34fcd0 MD |
4538 | assert(0); |
4539 | break; | |
c4b88406 | 4540 | } |
c4b88406 | 4541 | |
7db205b5 | 4542 | rcu_read_unlock(); |
840cb59c | 4543 | health_code_update(); |
c4b88406 | 4544 | return ret; |
8be98f9a MD |
4545 | } |
4546 | ||
84cd17c6 MD |
4547 | /* |
4548 | * Destroy a specific UST session in apps. | |
4549 | */ | |
3353de95 | 4550 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 4551 | { |
ffe60014 | 4552 | int ret; |
84cd17c6 | 4553 | struct ust_app_session *ua_sess; |
bec39940 | 4554 | struct lttng_ht_iter iter; |
d9bf3ca4 | 4555 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 4556 | |
852d0037 | 4557 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
4558 | |
4559 | rcu_read_lock(); | |
4560 | ||
e0c7ec2b DG |
4561 | if (!app->compatible) { |
4562 | goto end; | |
4563 | } | |
4564 | ||
84cd17c6 | 4565 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 4566 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 4567 | if (node == NULL) { |
d42f20df DG |
4568 | /* Session is being or is deleted. */ |
4569 | goto end; | |
84cd17c6 MD |
4570 | } |
4571 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 4572 | |
840cb59c | 4573 | health_code_update(); |
d0b96690 | 4574 | destroy_app_session(app, ua_sess); |
84cd17c6 | 4575 | |
840cb59c | 4576 | health_code_update(); |
7db205b5 | 4577 | |
84cd17c6 | 4578 | /* Quiescent wait after stopping trace */ |
fb45065e | 4579 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4580 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4581 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4582 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4583 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4584 | app->pid, ret); | |
4585 | } | |
e0c7ec2b DG |
4586 | end: |
4587 | rcu_read_unlock(); | |
840cb59c | 4588 | health_code_update(); |
84cd17c6 | 4589 | return 0; |
84cd17c6 MD |
4590 | } |
4591 | ||
5b4a0ec0 DG |
4592 | /* |
4593 | * Start tracing for the UST session. | |
4594 | */ | |
421cb601 DG |
4595 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
4596 | { | |
4597 | int ret = 0; | |
bec39940 | 4598 | struct lttng_ht_iter iter; |
421cb601 | 4599 | struct ust_app *app; |
48842b30 | 4600 | |
421cb601 DG |
4601 | DBG("Starting all UST traces"); |
4602 | ||
4603 | rcu_read_lock(); | |
421cb601 | 4604 | |
852d0037 | 4605 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
421cb601 | 4606 | ret = ust_app_start_trace(usess, app); |
48842b30 | 4607 | if (ret < 0) { |
5b4a0ec0 DG |
4608 | /* Continue to next apps even on error */ |
4609 | continue; | |
48842b30 | 4610 | } |
48842b30 | 4611 | } |
5b4a0ec0 | 4612 | |
48842b30 DG |
4613 | rcu_read_unlock(); |
4614 | ||
4615 | return 0; | |
4616 | } | |
487cf67c | 4617 | |
8be98f9a MD |
4618 | /* |
4619 | * Start tracing for the UST session. | |
ce34fcd0 | 4620 | * Called with UST session lock held. |
8be98f9a MD |
4621 | */ |
4622 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
4623 | { | |
4624 | int ret = 0; | |
bec39940 | 4625 | struct lttng_ht_iter iter; |
8be98f9a MD |
4626 | struct ust_app *app; |
4627 | ||
4628 | DBG("Stopping all UST traces"); | |
4629 | ||
4630 | rcu_read_lock(); | |
4631 | ||
b34cbebf MD |
4632 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4633 | ret = ust_app_stop_trace(usess, app); | |
4634 | if (ret < 0) { | |
4635 | /* Continue to next apps even on error */ | |
4636 | continue; | |
4637 | } | |
4638 | } | |
4639 | ||
ce34fcd0 | 4640 | (void) ust_app_flush_session(usess); |
8be98f9a MD |
4641 | |
4642 | rcu_read_unlock(); | |
4643 | ||
4644 | return 0; | |
4645 | } | |
4646 | ||
84cd17c6 MD |
4647 | /* |
4648 | * Destroy app UST session. | |
4649 | */ | |
4650 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
4651 | { | |
4652 | int ret = 0; | |
bec39940 | 4653 | struct lttng_ht_iter iter; |
84cd17c6 MD |
4654 | struct ust_app *app; |
4655 | ||
4656 | DBG("Destroy all UST traces"); | |
4657 | ||
4658 | rcu_read_lock(); | |
4659 | ||
852d0037 | 4660 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 4661 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
4662 | if (ret < 0) { |
4663 | /* Continue to next apps even on error */ | |
4664 | continue; | |
4665 | } | |
4666 | } | |
4667 | ||
4668 | rcu_read_unlock(); | |
4669 | ||
4670 | return 0; | |
4671 | } | |
4672 | ||
a9ad0c8f MD |
4673 | static |
4674 | void ust_app_global_create(struct ltt_ust_session *usess, struct ust_app *app) | |
487cf67c | 4675 | { |
55c54cce | 4676 | int ret = 0; |
31746f93 | 4677 | struct lttng_ht_iter iter, uiter; |
3d8ca23b | 4678 | struct ust_app_session *ua_sess = NULL; |
487cf67c DG |
4679 | struct ust_app_channel *ua_chan; |
4680 | struct ust_app_event *ua_event; | |
727d5404 | 4681 | struct ust_app_ctx *ua_ctx; |
a9ad0c8f | 4682 | int is_created = 0; |
1f3580c7 | 4683 | |
a9ad0c8f | 4684 | ret = create_ust_app_session(usess, app, &ua_sess, &is_created); |
3d8ca23b DG |
4685 | if (ret < 0) { |
4686 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
4687 | goto error; |
4688 | } | |
a9ad0c8f MD |
4689 | if (!is_created) { |
4690 | /* App session already created. */ | |
4691 | goto end; | |
4692 | } | |
3d8ca23b | 4693 | assert(ua_sess); |
487cf67c | 4694 | |
d0b96690 DG |
4695 | pthread_mutex_lock(&ua_sess->lock); |
4696 | ||
b161602a MD |
4697 | if (ua_sess->deleted) { |
4698 | pthread_mutex_unlock(&ua_sess->lock); | |
4699 | goto end; | |
4700 | } | |
4701 | ||
284d8f55 | 4702 | /* |
d0b96690 | 4703 | * We can iterate safely here over all UST app session since the create ust |
284d8f55 DG |
4704 | * app session above made a shadow copy of the UST global domain from the |
4705 | * ltt ust session. | |
4706 | */ | |
bec39940 DG |
4707 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
4708 | node.node) { | |
ad7a9107 | 4709 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
a7169585 | 4710 | if (ret < 0 && ret != -ENOTCONN) { |
ad7a9107 | 4711 | /* |
a7169585 MD |
4712 | * Stop everything. On error, the application |
4713 | * failed, no more file descriptor are available | |
4714 | * or ENOMEM so stopping here is the only thing | |
4715 | * we can do for now. The only exception is | |
4716 | * -ENOTCONN, which indicates that the application | |
4717 | * has exit. | |
ad7a9107 DG |
4718 | */ |
4719 | goto error_unlock; | |
487cf67c DG |
4720 | } |
4721 | ||
31746f93 DG |
4722 | /* |
4723 | * Add context using the list so they are enabled in the same order the | |
4724 | * user added them. | |
4725 | */ | |
4726 | cds_list_for_each_entry(ua_ctx, &ua_chan->ctx_list, list) { | |
727d5404 DG |
4727 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); |
4728 | if (ret < 0) { | |
d0b96690 | 4729 | goto error_unlock; |
727d5404 DG |
4730 | } |
4731 | } | |
4732 | ||
4733 | ||
284d8f55 | 4734 | /* For each events */ |
bec39940 DG |
4735 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
4736 | node.node) { | |
284d8f55 DG |
4737 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
4738 | if (ret < 0) { | |
d0b96690 | 4739 | goto error_unlock; |
487cf67c | 4740 | } |
36dc12cc | 4741 | } |
487cf67c DG |
4742 | } |
4743 | ||
d0b96690 DG |
4744 | pthread_mutex_unlock(&ua_sess->lock); |
4745 | ||
14fb1ebe | 4746 | if (usess->active) { |
421cb601 | 4747 | ret = ust_app_start_trace(usess, app); |
36dc12cc | 4748 | if (ret < 0) { |
36dc12cc DG |
4749 | goto error; |
4750 | } | |
4751 | ||
852d0037 | 4752 | DBG2("UST trace started for app pid %d", app->pid); |
36dc12cc | 4753 | } |
a9ad0c8f | 4754 | end: |
ffe60014 | 4755 | /* Everything went well at this point. */ |
ffe60014 DG |
4756 | return; |
4757 | ||
d0b96690 DG |
4758 | error_unlock: |
4759 | pthread_mutex_unlock(&ua_sess->lock); | |
487cf67c | 4760 | error: |
ffe60014 | 4761 | if (ua_sess) { |
d0b96690 | 4762 | destroy_app_session(app, ua_sess); |
ffe60014 | 4763 | } |
487cf67c DG |
4764 | return; |
4765 | } | |
55cc08a6 | 4766 | |
a9ad0c8f MD |
4767 | static |
4768 | void ust_app_global_destroy(struct ltt_ust_session *usess, struct ust_app *app) | |
4769 | { | |
4770 | struct ust_app_session *ua_sess; | |
4771 | ||
4772 | ua_sess = lookup_session_by_app(usess, app); | |
4773 | if (ua_sess == NULL) { | |
4774 | return; | |
4775 | } | |
4776 | destroy_app_session(app, ua_sess); | |
4777 | } | |
4778 | ||
4779 | /* | |
4780 | * Add channels/events from UST global domain to registered apps at sock. | |
4781 | * | |
4782 | * Called with session lock held. | |
4783 | * Called with RCU read-side lock held. | |
4784 | */ | |
4785 | void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app) | |
4786 | { | |
4787 | assert(usess); | |
4788 | ||
4789 | DBG2("UST app global update for app sock %d for session id %" PRIu64, | |
4790 | app->sock, usess->id); | |
4791 | ||
4792 | if (!app->compatible) { | |
4793 | return; | |
4794 | } | |
4795 | ||
4796 | if (trace_ust_pid_tracker_lookup(usess, app->pid)) { | |
4797 | ust_app_global_create(usess, app); | |
4798 | } else { | |
4799 | ust_app_global_destroy(usess, app); | |
4800 | } | |
4801 | } | |
4802 | ||
4803 | /* | |
4804 | * Called with session lock held. | |
4805 | */ | |
4806 | void ust_app_global_update_all(struct ltt_ust_session *usess) | |
4807 | { | |
4808 | struct lttng_ht_iter iter; | |
4809 | struct ust_app *app; | |
4810 | ||
4811 | rcu_read_lock(); | |
4812 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4813 | ust_app_global_update(usess, app); | |
4814 | } | |
4815 | rcu_read_unlock(); | |
4816 | } | |
4817 | ||
55cc08a6 DG |
4818 | /* |
4819 | * Add context to a specific channel for global UST domain. | |
4820 | */ | |
4821 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
4822 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
4823 | { | |
4824 | int ret = 0; | |
bec39940 DG |
4825 | struct lttng_ht_node_str *ua_chan_node; |
4826 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
4827 | struct ust_app_channel *ua_chan = NULL; |
4828 | struct ust_app_session *ua_sess; | |
4829 | struct ust_app *app; | |
4830 | ||
4831 | rcu_read_lock(); | |
4832 | ||
852d0037 | 4833 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4834 | if (!app->compatible) { |
4835 | /* | |
4836 | * TODO: In time, we should notice the caller of this error by | |
4837 | * telling him that this is a version error. | |
4838 | */ | |
4839 | continue; | |
4840 | } | |
55cc08a6 DG |
4841 | ua_sess = lookup_session_by_app(usess, app); |
4842 | if (ua_sess == NULL) { | |
4843 | continue; | |
4844 | } | |
4845 | ||
d0b96690 | 4846 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
4847 | |
4848 | if (ua_sess->deleted) { | |
4849 | pthread_mutex_unlock(&ua_sess->lock); | |
4850 | continue; | |
4851 | } | |
4852 | ||
55cc08a6 | 4853 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4854 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4855 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 4856 | if (ua_chan_node == NULL) { |
d0b96690 | 4857 | goto next_app; |
55cc08a6 DG |
4858 | } |
4859 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
4860 | node); | |
55cc08a6 DG |
4861 | ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app); |
4862 | if (ret < 0) { | |
d0b96690 | 4863 | goto next_app; |
55cc08a6 | 4864 | } |
d0b96690 DG |
4865 | next_app: |
4866 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
4867 | } |
4868 | ||
55cc08a6 DG |
4869 | rcu_read_unlock(); |
4870 | return ret; | |
4871 | } | |
4872 | ||
76d45b40 DG |
4873 | /* |
4874 | * Enable event for a channel from a UST session for a specific PID. | |
4875 | */ | |
4876 | int ust_app_enable_event_pid(struct ltt_ust_session *usess, | |
4877 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4878 | { | |
4879 | int ret = 0; | |
bec39940 | 4880 | struct lttng_ht_iter iter; |
18eace3b | 4881 | struct lttng_ht_node_str *ua_chan_node; |
76d45b40 DG |
4882 | struct ust_app *app; |
4883 | struct ust_app_session *ua_sess; | |
4884 | struct ust_app_channel *ua_chan; | |
4885 | struct ust_app_event *ua_event; | |
4886 | ||
4887 | DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid); | |
4888 | ||
4889 | rcu_read_lock(); | |
4890 | ||
4891 | app = ust_app_find_by_pid(pid); | |
4892 | if (app == NULL) { | |
4893 | ERR("UST app enable event per PID %d not found", pid); | |
4894 | ret = -1; | |
d0b96690 | 4895 | goto end; |
76d45b40 DG |
4896 | } |
4897 | ||
e0c7ec2b DG |
4898 | if (!app->compatible) { |
4899 | ret = 0; | |
d0b96690 | 4900 | goto end; |
e0c7ec2b DG |
4901 | } |
4902 | ||
76d45b40 | 4903 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4904 | if (!ua_sess) { |
4905 | /* The application has problem or is probably dead. */ | |
d0b96690 DG |
4906 | ret = 0; |
4907 | goto end; | |
c4a1715b | 4908 | } |
76d45b40 | 4909 | |
d0b96690 | 4910 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
4911 | |
4912 | if (ua_sess->deleted) { | |
4913 | ret = 0; | |
4914 | goto end_unlock; | |
4915 | } | |
4916 | ||
76d45b40 | 4917 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4918 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4919 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
76d45b40 DG |
4920 | /* If the channel is not found, there is a code flow error */ |
4921 | assert(ua_chan_node); | |
4922 | ||
4923 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4924 | ||
18eace3b | 4925 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 4926 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 4927 | if (ua_event == NULL) { |
76d45b40 DG |
4928 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
4929 | if (ret < 0) { | |
d0b96690 | 4930 | goto end_unlock; |
76d45b40 DG |
4931 | } |
4932 | } else { | |
76d45b40 DG |
4933 | ret = enable_ust_app_event(ua_sess, ua_event, app); |
4934 | if (ret < 0) { | |
d0b96690 | 4935 | goto end_unlock; |
76d45b40 DG |
4936 | } |
4937 | } | |
4938 | ||
d0b96690 DG |
4939 | end_unlock: |
4940 | pthread_mutex_unlock(&ua_sess->lock); | |
4941 | end: | |
76d45b40 DG |
4942 | rcu_read_unlock(); |
4943 | return ret; | |
4944 | } | |
7f79d3a1 | 4945 | |
4466912f DG |
4946 | /* |
4947 | * Calibrate registered applications. | |
4948 | */ | |
4949 | int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate) | |
4950 | { | |
4951 | int ret = 0; | |
4952 | struct lttng_ht_iter iter; | |
4953 | struct ust_app *app; | |
4954 | ||
4955 | rcu_read_lock(); | |
4956 | ||
852d0037 | 4957 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4466912f DG |
4958 | if (!app->compatible) { |
4959 | /* | |
4960 | * TODO: In time, we should notice the caller of this error by | |
4961 | * telling him that this is a version error. | |
4962 | */ | |
4963 | continue; | |
4964 | } | |
4965 | ||
840cb59c | 4966 | health_code_update(); |
86acf0da | 4967 | |
fb45065e | 4968 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4969 | ret = ustctl_calibrate(app->sock, calibrate); |
fb45065e | 4970 | pthread_mutex_unlock(&app->sock_lock); |
4466912f DG |
4971 | if (ret < 0) { |
4972 | switch (ret) { | |
4973 | case -ENOSYS: | |
4974 | /* Means that it's not implemented on the tracer side. */ | |
4975 | ret = 0; | |
4976 | break; | |
4977 | default: | |
4466912f | 4978 | DBG2("Calibrate app PID %d returned with error %d", |
852d0037 | 4979 | app->pid, ret); |
4466912f DG |
4980 | break; |
4981 | } | |
4982 | } | |
4983 | } | |
4984 | ||
4985 | DBG("UST app global domain calibration finished"); | |
4986 | ||
4987 | rcu_read_unlock(); | |
4988 | ||
840cb59c | 4989 | health_code_update(); |
86acf0da | 4990 | |
4466912f DG |
4991 | return ret; |
4992 | } | |
d0b96690 DG |
4993 | |
4994 | /* | |
4995 | * Receive registration and populate the given msg structure. | |
4996 | * | |
4997 | * On success return 0 else a negative value returned by the ustctl call. | |
4998 | */ | |
4999 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
5000 | { | |
5001 | int ret; | |
5002 | uint32_t pid, ppid, uid, gid; | |
5003 | ||
5004 | assert(msg); | |
5005 | ||
5006 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
5007 | &pid, &ppid, &uid, &gid, | |
5008 | &msg->bits_per_long, | |
5009 | &msg->uint8_t_alignment, | |
5010 | &msg->uint16_t_alignment, | |
5011 | &msg->uint32_t_alignment, | |
5012 | &msg->uint64_t_alignment, | |
5013 | &msg->long_alignment, | |
5014 | &msg->byte_order, | |
5015 | msg->name); | |
5016 | if (ret < 0) { | |
5017 | switch (-ret) { | |
5018 | case EPIPE: | |
5019 | case ECONNRESET: | |
5020 | case LTTNG_UST_ERR_EXITING: | |
5021 | DBG3("UST app recv reg message failed. Application died"); | |
5022 | break; | |
5023 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
5024 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
5025 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
5026 | LTTNG_UST_ABI_MINOR_VERSION); | |
5027 | break; | |
5028 | default: | |
5029 | ERR("UST app recv reg message failed with ret %d", ret); | |
5030 | break; | |
5031 | } | |
5032 | goto error; | |
5033 | } | |
5034 | msg->pid = (pid_t) pid; | |
5035 | msg->ppid = (pid_t) ppid; | |
5036 | msg->uid = (uid_t) uid; | |
5037 | msg->gid = (gid_t) gid; | |
5038 | ||
5039 | error: | |
5040 | return ret; | |
5041 | } | |
5042 | ||
10b56aef MD |
5043 | /* |
5044 | * Return a ust app session object using the application object and the | |
5045 | * session object descriptor has a key. If not found, NULL is returned. | |
5046 | * A RCU read side lock MUST be acquired when calling this function. | |
5047 | */ | |
5048 | static struct ust_app_session *find_session_by_objd(struct ust_app *app, | |
5049 | int objd) | |
5050 | { | |
5051 | struct lttng_ht_node_ulong *node; | |
5052 | struct lttng_ht_iter iter; | |
5053 | struct ust_app_session *ua_sess = NULL; | |
5054 | ||
5055 | assert(app); | |
5056 | ||
5057 | lttng_ht_lookup(app->ust_sessions_objd, (void *)((unsigned long) objd), &iter); | |
5058 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5059 | if (node == NULL) { | |
5060 | DBG2("UST app session find by objd %d not found", objd); | |
5061 | goto error; | |
5062 | } | |
5063 | ||
5064 | ua_sess = caa_container_of(node, struct ust_app_session, ust_objd_node); | |
5065 | ||
5066 | error: | |
5067 | return ua_sess; | |
5068 | } | |
5069 | ||
d88aee68 DG |
5070 | /* |
5071 | * Return a ust app channel object using the application object and the channel | |
5072 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
5073 | * lock MUST be acquired before calling this function. | |
5074 | */ | |
d0b96690 DG |
5075 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
5076 | int objd) | |
5077 | { | |
5078 | struct lttng_ht_node_ulong *node; | |
5079 | struct lttng_ht_iter iter; | |
5080 | struct ust_app_channel *ua_chan = NULL; | |
5081 | ||
5082 | assert(app); | |
5083 | ||
5084 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
5085 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5086 | if (node == NULL) { | |
5087 | DBG2("UST app channel find by objd %d not found", objd); | |
5088 | goto error; | |
5089 | } | |
5090 | ||
5091 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
5092 | ||
5093 | error: | |
5094 | return ua_chan; | |
5095 | } | |
5096 | ||
d88aee68 DG |
5097 | /* |
5098 | * Reply to a register channel notification from an application on the notify | |
5099 | * socket. The channel metadata is also created. | |
5100 | * | |
5101 | * The session UST registry lock is acquired in this function. | |
5102 | * | |
5103 | * On success 0 is returned else a negative value. | |
5104 | */ | |
d0b96690 DG |
5105 | static int reply_ust_register_channel(int sock, int sobjd, int cobjd, |
5106 | size_t nr_fields, struct ustctl_field *fields) | |
5107 | { | |
5108 | int ret, ret_code = 0; | |
5109 | uint32_t chan_id, reg_count; | |
7972aab2 | 5110 | uint64_t chan_reg_key; |
d0b96690 DG |
5111 | enum ustctl_channel_header type; |
5112 | struct ust_app *app; | |
5113 | struct ust_app_channel *ua_chan; | |
5114 | struct ust_app_session *ua_sess; | |
7972aab2 | 5115 | struct ust_registry_session *registry; |
45893984 | 5116 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
5117 | |
5118 | rcu_read_lock(); | |
5119 | ||
5120 | /* Lookup application. If not found, there is a code flow error. */ | |
5121 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
5122 | if (!app) { |
5123 | DBG("Application socket %d is being teardown. Abort event notify", | |
5124 | sock); | |
5125 | ret = 0; | |
d5d629b5 | 5126 | free(fields); |
d88aee68 DG |
5127 | goto error_rcu_unlock; |
5128 | } | |
d0b96690 | 5129 | |
4950b860 | 5130 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 5131 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
5132 | if (!ua_chan) { |
5133 | DBG("Application channel is being teardown. Abort event notify"); | |
5134 | ret = 0; | |
d5d629b5 | 5135 | free(fields); |
4950b860 MD |
5136 | goto error_rcu_unlock; |
5137 | } | |
5138 | ||
d0b96690 DG |
5139 | assert(ua_chan->session); |
5140 | ua_sess = ua_chan->session; | |
d0b96690 | 5141 | |
7972aab2 DG |
5142 | /* Get right session registry depending on the session buffer type. */ |
5143 | registry = get_session_registry(ua_sess); | |
5144 | assert(registry); | |
45893984 | 5145 | |
7972aab2 DG |
5146 | /* Depending on the buffer type, a different channel key is used. */ |
5147 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
5148 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 5149 | } else { |
7972aab2 | 5150 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
5151 | } |
5152 | ||
7972aab2 DG |
5153 | pthread_mutex_lock(®istry->lock); |
5154 | ||
5155 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
5156 | assert(chan_reg); | |
5157 | ||
5158 | if (!chan_reg->register_done) { | |
5159 | reg_count = ust_registry_get_event_count(chan_reg); | |
5160 | if (reg_count < 31) { | |
5161 | type = USTCTL_CHANNEL_HEADER_COMPACT; | |
5162 | } else { | |
5163 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
5164 | } | |
5165 | ||
5166 | chan_reg->nr_ctx_fields = nr_fields; | |
5167 | chan_reg->ctx_fields = fields; | |
5168 | chan_reg->header_type = type; | |
d0b96690 | 5169 | } else { |
7972aab2 DG |
5170 | /* Get current already assigned values. */ |
5171 | type = chan_reg->header_type; | |
d5d629b5 DG |
5172 | free(fields); |
5173 | /* Set to NULL so the error path does not do a double free. */ | |
5174 | fields = NULL; | |
d0b96690 | 5175 | } |
7972aab2 DG |
5176 | /* Channel id is set during the object creation. */ |
5177 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
5178 | |
5179 | /* Append to metadata */ | |
7972aab2 DG |
5180 | if (!chan_reg->metadata_dumped) { |
5181 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
5182 | if (ret_code) { |
5183 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
5184 | goto reply; | |
5185 | } | |
5186 | } | |
5187 | ||
5188 | reply: | |
7972aab2 DG |
5189 | DBG3("UST app replying to register channel key %" PRIu64 |
5190 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
5191 | ret_code); | |
d0b96690 DG |
5192 | |
5193 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
5194 | if (ret < 0) { | |
5195 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5196 | ERR("UST app reply channel failed with ret %d", ret); | |
5197 | } else { | |
5198 | DBG3("UST app reply channel failed. Application died"); | |
5199 | } | |
5200 | goto error; | |
5201 | } | |
5202 | ||
7972aab2 DG |
5203 | /* This channel registry registration is completed. */ |
5204 | chan_reg->register_done = 1; | |
5205 | ||
d0b96690 | 5206 | error: |
7972aab2 | 5207 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 5208 | error_rcu_unlock: |
d0b96690 | 5209 | rcu_read_unlock(); |
d5d629b5 DG |
5210 | if (ret) { |
5211 | free(fields); | |
5212 | } | |
d0b96690 DG |
5213 | return ret; |
5214 | } | |
5215 | ||
d88aee68 DG |
5216 | /* |
5217 | * Add event to the UST channel registry. When the event is added to the | |
5218 | * registry, the metadata is also created. Once done, this replies to the | |
5219 | * application with the appropriate error code. | |
5220 | * | |
5221 | * The session UST registry lock is acquired in the function. | |
5222 | * | |
5223 | * On success 0 is returned else a negative value. | |
5224 | */ | |
d0b96690 | 5225 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
2106efa0 PP |
5226 | char *sig, size_t nr_fields, struct ustctl_field *fields, |
5227 | int loglevel_value, char *model_emf_uri) | |
d0b96690 DG |
5228 | { |
5229 | int ret, ret_code; | |
5230 | uint32_t event_id = 0; | |
7972aab2 | 5231 | uint64_t chan_reg_key; |
d0b96690 DG |
5232 | struct ust_app *app; |
5233 | struct ust_app_channel *ua_chan; | |
5234 | struct ust_app_session *ua_sess; | |
7972aab2 | 5235 | struct ust_registry_session *registry; |
d0b96690 DG |
5236 | |
5237 | rcu_read_lock(); | |
5238 | ||
5239 | /* Lookup application. If not found, there is a code flow error. */ | |
5240 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
5241 | if (!app) { |
5242 | DBG("Application socket %d is being teardown. Abort event notify", | |
5243 | sock); | |
5244 | ret = 0; | |
d5d629b5 DG |
5245 | free(sig); |
5246 | free(fields); | |
5247 | free(model_emf_uri); | |
d88aee68 DG |
5248 | goto error_rcu_unlock; |
5249 | } | |
d0b96690 | 5250 | |
4950b860 | 5251 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 5252 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
5253 | if (!ua_chan) { |
5254 | DBG("Application channel is being teardown. Abort event notify"); | |
5255 | ret = 0; | |
d5d629b5 DG |
5256 | free(sig); |
5257 | free(fields); | |
5258 | free(model_emf_uri); | |
4950b860 MD |
5259 | goto error_rcu_unlock; |
5260 | } | |
5261 | ||
d0b96690 DG |
5262 | assert(ua_chan->session); |
5263 | ua_sess = ua_chan->session; | |
5264 | ||
7972aab2 DG |
5265 | registry = get_session_registry(ua_sess); |
5266 | assert(registry); | |
5267 | ||
5268 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
5269 | chan_reg_key = ua_chan->tracing_channel_id; | |
5270 | } else { | |
5271 | chan_reg_key = ua_chan->key; | |
5272 | } | |
5273 | ||
5274 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 5275 | |
d5d629b5 DG |
5276 | /* |
5277 | * From this point on, this call acquires the ownership of the sig, fields | |
5278 | * and model_emf_uri meaning any free are done inside it if needed. These | |
5279 | * three variables MUST NOT be read/write after this. | |
5280 | */ | |
7972aab2 | 5281 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
2106efa0 PP |
5282 | sobjd, cobjd, name, sig, nr_fields, fields, |
5283 | loglevel_value, model_emf_uri, ua_sess->buffer_type, | |
5284 | &event_id, app); | |
d0b96690 DG |
5285 | |
5286 | /* | |
5287 | * The return value is returned to ustctl so in case of an error, the | |
5288 | * application can be notified. In case of an error, it's important not to | |
5289 | * return a negative error or else the application will get closed. | |
5290 | */ | |
5291 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
5292 | if (ret < 0) { | |
5293 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5294 | ERR("UST app reply event failed with ret %d", ret); | |
5295 | } else { | |
5296 | DBG3("UST app reply event failed. Application died"); | |
5297 | } | |
5298 | /* | |
5299 | * No need to wipe the create event since the application socket will | |
5300 | * get close on error hence cleaning up everything by itself. | |
5301 | */ | |
5302 | goto error; | |
5303 | } | |
5304 | ||
7972aab2 DG |
5305 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
5306 | name, event_id); | |
d88aee68 | 5307 | |
d0b96690 | 5308 | error: |
7972aab2 | 5309 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 5310 | error_rcu_unlock: |
d0b96690 DG |
5311 | rcu_read_unlock(); |
5312 | return ret; | |
5313 | } | |
5314 | ||
10b56aef MD |
5315 | /* |
5316 | * Add enum to the UST session registry. Once done, this replies to the | |
5317 | * application with the appropriate error code. | |
5318 | * | |
5319 | * The session UST registry lock is acquired within this function. | |
5320 | * | |
5321 | * On success 0 is returned else a negative value. | |
5322 | */ | |
5323 | static int add_enum_ust_registry(int sock, int sobjd, char *name, | |
5324 | struct ustctl_enum_entry *entries, size_t nr_entries) | |
5325 | { | |
5326 | int ret = 0, ret_code; | |
5327 | struct ust_app *app; | |
5328 | struct ust_app_session *ua_sess; | |
5329 | struct ust_registry_session *registry; | |
5330 | uint64_t enum_id = -1ULL; | |
5331 | ||
5332 | rcu_read_lock(); | |
5333 | ||
5334 | /* Lookup application. If not found, there is a code flow error. */ | |
5335 | app = find_app_by_notify_sock(sock); | |
5336 | if (!app) { | |
5337 | /* Return an error since this is not an error */ | |
5338 | DBG("Application socket %d is being torn down. Aborting enum registration", | |
5339 | sock); | |
5340 | free(entries); | |
5341 | goto error_rcu_unlock; | |
5342 | } | |
5343 | ||
5344 | /* Lookup session by UST object descriptor. */ | |
5345 | ua_sess = find_session_by_objd(app, sobjd); | |
5346 | if (!ua_sess) { | |
5347 | /* Return an error since this is not an error */ | |
5348 | DBG("Application session is being torn down. Aborting enum registration."); | |
5349 | free(entries); | |
5350 | goto error_rcu_unlock; | |
5351 | } | |
5352 | ||
5353 | registry = get_session_registry(ua_sess); | |
5354 | assert(registry); | |
5355 | ||
5356 | pthread_mutex_lock(®istry->lock); | |
5357 | ||
5358 | /* | |
5359 | * From this point on, the callee acquires the ownership of | |
5360 | * entries. The variable entries MUST NOT be read/written after | |
5361 | * call. | |
5362 | */ | |
5363 | ret_code = ust_registry_create_or_find_enum(registry, sobjd, name, | |
5364 | entries, nr_entries, &enum_id); | |
5365 | entries = NULL; | |
5366 | ||
5367 | /* | |
5368 | * The return value is returned to ustctl so in case of an error, the | |
5369 | * application can be notified. In case of an error, it's important not to | |
5370 | * return a negative error or else the application will get closed. | |
5371 | */ | |
5372 | ret = ustctl_reply_register_enum(sock, enum_id, ret_code); | |
5373 | if (ret < 0) { | |
5374 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5375 | ERR("UST app reply enum failed with ret %d", ret); | |
5376 | } else { | |
5377 | DBG3("UST app reply enum failed. Application died"); | |
5378 | } | |
5379 | /* | |
5380 | * No need to wipe the create enum since the application socket will | |
5381 | * get close on error hence cleaning up everything by itself. | |
5382 | */ | |
5383 | goto error; | |
5384 | } | |
5385 | ||
5386 | DBG3("UST registry enum %s added successfully or already found", name); | |
5387 | ||
5388 | error: | |
5389 | pthread_mutex_unlock(®istry->lock); | |
5390 | error_rcu_unlock: | |
5391 | rcu_read_unlock(); | |
5392 | return ret; | |
5393 | } | |
5394 | ||
d88aee68 DG |
5395 | /* |
5396 | * Handle application notification through the given notify socket. | |
5397 | * | |
5398 | * Return 0 on success or else a negative value. | |
5399 | */ | |
d0b96690 DG |
5400 | int ust_app_recv_notify(int sock) |
5401 | { | |
5402 | int ret; | |
5403 | enum ustctl_notify_cmd cmd; | |
5404 | ||
5405 | DBG3("UST app receiving notify from sock %d", sock); | |
5406 | ||
5407 | ret = ustctl_recv_notify(sock, &cmd); | |
5408 | if (ret < 0) { | |
5409 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5410 | ERR("UST app recv notify failed with ret %d", ret); | |
5411 | } else { | |
5412 | DBG3("UST app recv notify failed. Application died"); | |
5413 | } | |
5414 | goto error; | |
5415 | } | |
5416 | ||
5417 | switch (cmd) { | |
5418 | case USTCTL_NOTIFY_CMD_EVENT: | |
5419 | { | |
2106efa0 | 5420 | int sobjd, cobjd, loglevel_value; |
d0b96690 DG |
5421 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; |
5422 | size_t nr_fields; | |
5423 | struct ustctl_field *fields; | |
5424 | ||
5425 | DBG2("UST app ustctl register event received"); | |
5426 | ||
2106efa0 PP |
5427 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, |
5428 | &loglevel_value, &sig, &nr_fields, &fields, | |
5429 | &model_emf_uri); | |
d0b96690 DG |
5430 | if (ret < 0) { |
5431 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5432 | ERR("UST app recv event failed with ret %d", ret); | |
5433 | } else { | |
5434 | DBG3("UST app recv event failed. Application died"); | |
5435 | } | |
5436 | goto error; | |
5437 | } | |
5438 | ||
d5d629b5 DG |
5439 | /* |
5440 | * Add event to the UST registry coming from the notify socket. This | |
5441 | * call will free if needed the sig, fields and model_emf_uri. This | |
5442 | * code path loses the ownsership of these variables and transfer them | |
5443 | * to the this function. | |
5444 | */ | |
d0b96690 | 5445 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
2106efa0 | 5446 | fields, loglevel_value, model_emf_uri); |
d0b96690 DG |
5447 | if (ret < 0) { |
5448 | goto error; | |
5449 | } | |
5450 | ||
5451 | break; | |
5452 | } | |
5453 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
5454 | { | |
5455 | int sobjd, cobjd; | |
5456 | size_t nr_fields; | |
5457 | struct ustctl_field *fields; | |
5458 | ||
5459 | DBG2("UST app ustctl register channel received"); | |
5460 | ||
5461 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
5462 | &fields); | |
5463 | if (ret < 0) { | |
5464 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5465 | ERR("UST app recv channel failed with ret %d", ret); | |
5466 | } else { | |
5467 | DBG3("UST app recv channel failed. Application died"); | |
5468 | } | |
5469 | goto error; | |
5470 | } | |
5471 | ||
d5d629b5 DG |
5472 | /* |
5473 | * The fields ownership are transfered to this function call meaning | |
5474 | * that if needed it will be freed. After this, it's invalid to access | |
5475 | * fields or clean it up. | |
5476 | */ | |
d0b96690 DG |
5477 | ret = reply_ust_register_channel(sock, sobjd, cobjd, nr_fields, |
5478 | fields); | |
5479 | if (ret < 0) { | |
5480 | goto error; | |
5481 | } | |
5482 | ||
5483 | break; | |
5484 | } | |
10b56aef MD |
5485 | case USTCTL_NOTIFY_CMD_ENUM: |
5486 | { | |
5487 | int sobjd; | |
5488 | char name[LTTNG_UST_SYM_NAME_LEN]; | |
5489 | size_t nr_entries; | |
5490 | struct ustctl_enum_entry *entries; | |
5491 | ||
5492 | DBG2("UST app ustctl register enum received"); | |
5493 | ||
5494 | ret = ustctl_recv_register_enum(sock, &sobjd, name, | |
5495 | &entries, &nr_entries); | |
5496 | if (ret < 0) { | |
5497 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5498 | ERR("UST app recv enum failed with ret %d", ret); | |
5499 | } else { | |
5500 | DBG3("UST app recv enum failed. Application died"); | |
5501 | } | |
5502 | goto error; | |
5503 | } | |
5504 | ||
5505 | /* Callee assumes ownership of entries */ | |
5506 | ret = add_enum_ust_registry(sock, sobjd, name, | |
5507 | entries, nr_entries); | |
5508 | if (ret < 0) { | |
5509 | goto error; | |
5510 | } | |
5511 | ||
5512 | break; | |
5513 | } | |
d0b96690 DG |
5514 | default: |
5515 | /* Should NEVER happen. */ | |
5516 | assert(0); | |
5517 | } | |
5518 | ||
5519 | error: | |
5520 | return ret; | |
5521 | } | |
d88aee68 DG |
5522 | |
5523 | /* | |
5524 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
5525 | * corresponding application. On failure, the call_rcu to close the socket is | |
5526 | * executed. If an application is found, it tries to delete it from the notify | |
5527 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
5528 | * | |
5529 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
5530 | * call RCU is not done but the rest of the cleanup is. | |
5531 | */ | |
5532 | void ust_app_notify_sock_unregister(int sock) | |
5533 | { | |
5534 | int err_enomem = 0; | |
5535 | struct lttng_ht_iter iter; | |
5536 | struct ust_app *app; | |
5537 | struct ust_app_notify_sock_obj *obj; | |
5538 | ||
5539 | assert(sock >= 0); | |
5540 | ||
5541 | rcu_read_lock(); | |
5542 | ||
5543 | obj = zmalloc(sizeof(*obj)); | |
5544 | if (!obj) { | |
5545 | /* | |
5546 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
5547 | * procedure but the call_rcu will not be called. In this case, we | |
5548 | * accept the fd leak rather than possibly creating an unsynchronized | |
5549 | * state between threads. | |
5550 | * | |
5551 | * TODO: The notify object should be created once the notify socket is | |
5552 | * registered and stored independantely from the ust app object. The | |
5553 | * tricky part is to synchronize the teardown of the application and | |
5554 | * this notify object. Let's keep that in mind so we can avoid this | |
5555 | * kind of shenanigans with ENOMEM in the teardown path. | |
5556 | */ | |
5557 | err_enomem = 1; | |
5558 | } else { | |
5559 | obj->fd = sock; | |
5560 | } | |
5561 | ||
5562 | DBG("UST app notify socket unregister %d", sock); | |
5563 | ||
5564 | /* | |
5565 | * Lookup application by notify socket. If this fails, this means that the | |
5566 | * hash table delete has already been done by the application | |
5567 | * unregistration process so we can safely close the notify socket in a | |
5568 | * call RCU. | |
5569 | */ | |
5570 | app = find_app_by_notify_sock(sock); | |
5571 | if (!app) { | |
5572 | goto close_socket; | |
5573 | } | |
5574 | ||
5575 | iter.iter.node = &app->notify_sock_n.node; | |
5576 | ||
5577 | /* | |
5578 | * Whatever happens here either we fail or succeed, in both cases we have | |
5579 | * to close the socket after a grace period to continue to the call RCU | |
5580 | * here. If the deletion is successful, the application is not visible | |
5581 | * anymore by other threads and is it fails it means that it was already | |
5582 | * deleted from the hash table so either way we just have to close the | |
5583 | * socket. | |
5584 | */ | |
5585 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
5586 | ||
5587 | close_socket: | |
5588 | rcu_read_unlock(); | |
5589 | ||
5590 | /* | |
5591 | * Close socket after a grace period to avoid for the socket to be reused | |
5592 | * before the application object is freed creating potential race between | |
5593 | * threads trying to add unique in the global hash table. | |
5594 | */ | |
5595 | if (!err_enomem) { | |
5596 | call_rcu(&obj->head, close_notify_sock_rcu); | |
5597 | } | |
5598 | } | |
f45e313d DG |
5599 | |
5600 | /* | |
5601 | * Destroy a ust app data structure and free its memory. | |
5602 | */ | |
5603 | void ust_app_destroy(struct ust_app *app) | |
5604 | { | |
5605 | if (!app) { | |
5606 | return; | |
5607 | } | |
5608 | ||
5609 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
5610 | } | |
6dc3064a DG |
5611 | |
5612 | /* | |
5613 | * Take a snapshot for a given UST session. The snapshot is sent to the given | |
5614 | * output. | |
5615 | * | |
5616 | * Return 0 on success or else a negative value. | |
5617 | */ | |
5618 | int ust_app_snapshot_record(struct ltt_ust_session *usess, | |
d07ceecd MD |
5619 | struct snapshot_output *output, int wait, |
5620 | uint64_t nb_packets_per_stream) | |
6dc3064a DG |
5621 | { |
5622 | int ret = 0; | |
7badf927 | 5623 | unsigned int snapshot_done = 0; |
6dc3064a DG |
5624 | struct lttng_ht_iter iter; |
5625 | struct ust_app *app; | |
af706bb7 | 5626 | char pathname[PATH_MAX]; |
6dc3064a DG |
5627 | |
5628 | assert(usess); | |
5629 | assert(output); | |
5630 | ||
5631 | rcu_read_lock(); | |
5632 | ||
8c924c7b MD |
5633 | switch (usess->buffer_type) { |
5634 | case LTTNG_BUFFER_PER_UID: | |
5635 | { | |
5636 | struct buffer_reg_uid *reg; | |
6dc3064a | 5637 | |
8c924c7b MD |
5638 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
5639 | struct buffer_reg_channel *reg_chan; | |
5640 | struct consumer_socket *socket; | |
6dc3064a | 5641 | |
8c924c7b MD |
5642 | /* Get consumer socket to use to push the metadata.*/ |
5643 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
5644 | usess->consumer); | |
5645 | if (!socket) { | |
5646 | ret = -EINVAL; | |
5647 | goto error; | |
5648 | } | |
6dc3064a | 5649 | |
8c924c7b MD |
5650 | memset(pathname, 0, sizeof(pathname)); |
5651 | ret = snprintf(pathname, sizeof(pathname), | |
5652 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH, | |
5653 | reg->uid, reg->bits_per_long); | |
5654 | if (ret < 0) { | |
5655 | PERROR("snprintf snapshot path"); | |
5656 | goto error; | |
5657 | } | |
5658 | ||
5659 | /* Add the UST default trace dir to path. */ | |
5660 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
5661 | reg_chan, node.node) { | |
68808f4e DG |
5662 | ret = consumer_snapshot_channel(socket, reg_chan->consumer_key, |
5663 | output, 0, usess->uid, usess->gid, pathname, wait, | |
d07ceecd | 5664 | nb_packets_per_stream); |
8c924c7b MD |
5665 | if (ret < 0) { |
5666 | goto error; | |
5667 | } | |
5668 | } | |
68808f4e DG |
5669 | ret = consumer_snapshot_channel(socket, |
5670 | reg->registry->reg.ust->metadata_key, output, 1, | |
d07ceecd | 5671 | usess->uid, usess->gid, pathname, wait, 0); |
8c924c7b MD |
5672 | if (ret < 0) { |
5673 | goto error; | |
5674 | } | |
7badf927 | 5675 | snapshot_done = 1; |
af706bb7 | 5676 | } |
8c924c7b MD |
5677 | break; |
5678 | } | |
5679 | case LTTNG_BUFFER_PER_PID: | |
5680 | { | |
5681 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5682 | struct consumer_socket *socket; | |
5683 | struct lttng_ht_iter chan_iter; | |
5684 | struct ust_app_channel *ua_chan; | |
5685 | struct ust_app_session *ua_sess; | |
5686 | struct ust_registry_session *registry; | |
5687 | ||
5688 | ua_sess = lookup_session_by_app(usess, app); | |
5689 | if (!ua_sess) { | |
5690 | /* Session not associated with this app. */ | |
5691 | continue; | |
5692 | } | |
af706bb7 | 5693 | |
8c924c7b MD |
5694 | /* Get the right consumer socket for the application. */ |
5695 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
5696 | output->consumer); | |
5697 | if (!socket) { | |
5c786ded | 5698 | ret = -EINVAL; |
5c786ded JD |
5699 | goto error; |
5700 | } | |
5701 | ||
8c924c7b MD |
5702 | /* Add the UST default trace dir to path. */ |
5703 | memset(pathname, 0, sizeof(pathname)); | |
5704 | ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "/%s", | |
5705 | ua_sess->path); | |
6dc3064a | 5706 | if (ret < 0) { |
8c924c7b | 5707 | PERROR("snprintf snapshot path"); |
6dc3064a DG |
5708 | goto error; |
5709 | } | |
6dc3064a | 5710 | |
8c924c7b MD |
5711 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, |
5712 | ua_chan, node.node) { | |
68808f4e DG |
5713 | ret = consumer_snapshot_channel(socket, ua_chan->key, output, |
5714 | 0, ua_sess->euid, ua_sess->egid, pathname, wait, | |
d07ceecd | 5715 | nb_packets_per_stream); |
8c924c7b MD |
5716 | if (ret < 0) { |
5717 | goto error; | |
5718 | } | |
5719 | } | |
5720 | ||
5721 | registry = get_session_registry(ua_sess); | |
5722 | assert(registry); | |
5723 | ret = consumer_snapshot_channel(socket, registry->metadata_key, output, | |
d07ceecd | 5724 | 1, ua_sess->euid, ua_sess->egid, pathname, wait, 0); |
8c924c7b MD |
5725 | if (ret < 0) { |
5726 | goto error; | |
5727 | } | |
7badf927 | 5728 | snapshot_done = 1; |
8c924c7b MD |
5729 | } |
5730 | break; | |
5731 | } | |
5732 | default: | |
5733 | assert(0); | |
5734 | break; | |
6dc3064a DG |
5735 | } |
5736 | ||
7badf927 DG |
5737 | if (!snapshot_done) { |
5738 | /* | |
5739 | * If no snapshot was made and we are not in the error path, this means | |
5740 | * that there are no buffers thus no (prior) application to snapshot | |
5741 | * data from so we have simply NO data. | |
5742 | */ | |
5743 | ret = -ENODATA; | |
5744 | } | |
5745 | ||
6dc3064a DG |
5746 | error: |
5747 | rcu_read_unlock(); | |
5748 | return ret; | |
5749 | } | |
5c786ded JD |
5750 | |
5751 | /* | |
d07ceecd | 5752 | * Return the size taken by one more packet per stream. |
5c786ded | 5753 | */ |
d07ceecd MD |
5754 | uint64_t ust_app_get_size_one_more_packet_per_stream(struct ltt_ust_session *usess, |
5755 | uint64_t cur_nr_packets) | |
5c786ded | 5756 | { |
d07ceecd | 5757 | uint64_t tot_size = 0; |
5c786ded JD |
5758 | struct ust_app *app; |
5759 | struct lttng_ht_iter iter; | |
5760 | ||
5761 | assert(usess); | |
5762 | ||
5763 | switch (usess->buffer_type) { | |
5764 | case LTTNG_BUFFER_PER_UID: | |
5765 | { | |
5766 | struct buffer_reg_uid *reg; | |
5767 | ||
5768 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
5769 | struct buffer_reg_channel *reg_chan; | |
5770 | ||
b7064eaa | 5771 | rcu_read_lock(); |
5c786ded JD |
5772 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
5773 | reg_chan, node.node) { | |
d07ceecd MD |
5774 | if (cur_nr_packets >= reg_chan->num_subbuf) { |
5775 | /* | |
5776 | * Don't take channel into account if we | |
5777 | * already grab all its packets. | |
5778 | */ | |
5779 | continue; | |
5780 | } | |
5781 | tot_size += reg_chan->subbuf_size * reg_chan->stream_count; | |
5c786ded | 5782 | } |
b7064eaa | 5783 | rcu_read_unlock(); |
5c786ded JD |
5784 | } |
5785 | break; | |
5786 | } | |
5787 | case LTTNG_BUFFER_PER_PID: | |
5788 | { | |
5789 | rcu_read_lock(); | |
5790 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5791 | struct ust_app_channel *ua_chan; | |
5792 | struct ust_app_session *ua_sess; | |
5793 | struct lttng_ht_iter chan_iter; | |
5794 | ||
5795 | ua_sess = lookup_session_by_app(usess, app); | |
5796 | if (!ua_sess) { | |
5797 | /* Session not associated with this app. */ | |
5798 | continue; | |
5799 | } | |
5800 | ||
5801 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
5802 | ua_chan, node.node) { | |
d07ceecd MD |
5803 | if (cur_nr_packets >= ua_chan->attr.num_subbuf) { |
5804 | /* | |
5805 | * Don't take channel into account if we | |
5806 | * already grab all its packets. | |
5807 | */ | |
5808 | continue; | |
5809 | } | |
5810 | tot_size += ua_chan->attr.subbuf_size * ua_chan->streams.count; | |
5c786ded JD |
5811 | } |
5812 | } | |
5813 | rcu_read_unlock(); | |
5814 | break; | |
5815 | } | |
5816 | default: | |
5817 | assert(0); | |
5818 | break; | |
5819 | } | |
5820 | ||
d07ceecd | 5821 | return tot_size; |
5c786ded | 5822 | } |