Commit | Line | Data |
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91d76f53 DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
bdf64013 | 3 | * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
91d76f53 | 4 | * |
d14d33bf AM |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
91d76f53 DG |
8 | * |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
d14d33bf AM |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
91d76f53 DG |
17 | */ |
18 | ||
6c1c0768 | 19 | #define _LGPL_SOURCE |
91d76f53 | 20 | #include <errno.h> |
7972aab2 | 21 | #include <inttypes.h> |
91d76f53 DG |
22 | #include <pthread.h> |
23 | #include <stdio.h> | |
24 | #include <stdlib.h> | |
099e26bd | 25 | #include <string.h> |
aba8e916 DG |
26 | #include <sys/stat.h> |
27 | #include <sys/types.h> | |
099e26bd | 28 | #include <unistd.h> |
0df502fd | 29 | #include <urcu/compiler.h> |
fb54cdbf | 30 | #include <lttng/ust-error.h> |
331744e3 | 31 | #include <signal.h> |
bec39940 | 32 | |
990570ed | 33 | #include <common/common.h> |
86acf0da | 34 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 35 | |
7972aab2 | 36 | #include "buffer-registry.h" |
86acf0da | 37 | #include "fd-limit.h" |
8782cc74 | 38 | #include "health-sessiond.h" |
56fff090 | 39 | #include "ust-app.h" |
48842b30 | 40 | #include "ust-consumer.h" |
d80a6244 | 41 | #include "ust-ctl.h" |
0b2dc8df | 42 | #include "utils.h" |
d80a6244 | 43 | |
c4b88406 MD |
44 | static |
45 | int ust_app_flush_app_session(struct ust_app *app, struct ust_app_session *ua_sess); | |
46 | ||
d9bf3ca4 MD |
47 | /* Next available channel key. Access under next_channel_key_lock. */ |
48 | static uint64_t _next_channel_key; | |
49 | static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER; | |
50 | ||
51 | /* Next available session ID. Access under next_session_id_lock. */ | |
52 | static uint64_t _next_session_id; | |
53 | static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER; | |
ffe60014 DG |
54 | |
55 | /* | |
d9bf3ca4 | 56 | * Return the incremented value of next_channel_key. |
ffe60014 | 57 | */ |
d9bf3ca4 | 58 | static uint64_t get_next_channel_key(void) |
ffe60014 | 59 | { |
d9bf3ca4 MD |
60 | uint64_t ret; |
61 | ||
62 | pthread_mutex_lock(&next_channel_key_lock); | |
63 | ret = ++_next_channel_key; | |
64 | pthread_mutex_unlock(&next_channel_key_lock); | |
65 | return ret; | |
ffe60014 DG |
66 | } |
67 | ||
68 | /* | |
7972aab2 | 69 | * Return the atomically incremented value of next_session_id. |
ffe60014 | 70 | */ |
d9bf3ca4 | 71 | static uint64_t get_next_session_id(void) |
ffe60014 | 72 | { |
d9bf3ca4 MD |
73 | uint64_t ret; |
74 | ||
75 | pthread_mutex_lock(&next_session_id_lock); | |
76 | ret = ++_next_session_id; | |
77 | pthread_mutex_unlock(&next_session_id_lock); | |
78 | return ret; | |
ffe60014 DG |
79 | } |
80 | ||
d65d2de8 DG |
81 | static void copy_channel_attr_to_ustctl( |
82 | struct ustctl_consumer_channel_attr *attr, | |
83 | struct lttng_ust_channel_attr *uattr) | |
84 | { | |
85 | /* Copy event attributes since the layout is different. */ | |
86 | attr->subbuf_size = uattr->subbuf_size; | |
87 | attr->num_subbuf = uattr->num_subbuf; | |
88 | attr->overwrite = uattr->overwrite; | |
89 | attr->switch_timer_interval = uattr->switch_timer_interval; | |
90 | attr->read_timer_interval = uattr->read_timer_interval; | |
91 | attr->output = uattr->output; | |
92 | } | |
93 | ||
025faf73 DG |
94 | /* |
95 | * Match function for the hash table lookup. | |
96 | * | |
97 | * It matches an ust app event based on three attributes which are the event | |
98 | * name, the filter bytecode and the loglevel. | |
99 | */ | |
18eace3b DG |
100 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
101 | { | |
102 | struct ust_app_event *event; | |
103 | const struct ust_app_ht_key *key; | |
2106efa0 | 104 | int ev_loglevel_value; |
18eace3b DG |
105 | |
106 | assert(node); | |
107 | assert(_key); | |
108 | ||
109 | event = caa_container_of(node, struct ust_app_event, node.node); | |
110 | key = _key; | |
2106efa0 | 111 | ev_loglevel_value = event->attr.loglevel; |
18eace3b | 112 | |
1af53eb5 | 113 | /* Match the 4 elements of the key: name, filter, loglevel, exclusions */ |
18eace3b DG |
114 | |
115 | /* Event name */ | |
116 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
117 | goto no_match; | |
118 | } | |
119 | ||
120 | /* Event loglevel. */ | |
2106efa0 | 121 | if (ev_loglevel_value != key->loglevel_type) { |
025faf73 | 122 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
2106efa0 PP |
123 | && key->loglevel_type == 0 && |
124 | ev_loglevel_value == -1) { | |
025faf73 DG |
125 | /* |
126 | * Match is accepted. This is because on event creation, the | |
127 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
128 | * -1 are accepted for this loglevel type since 0 is the one set by | |
129 | * the API when receiving an enable event. | |
130 | */ | |
131 | } else { | |
132 | goto no_match; | |
133 | } | |
18eace3b DG |
134 | } |
135 | ||
136 | /* One of the filters is NULL, fail. */ | |
137 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
138 | goto no_match; | |
139 | } | |
140 | ||
025faf73 DG |
141 | if (key->filter && event->filter) { |
142 | /* Both filters exists, check length followed by the bytecode. */ | |
143 | if (event->filter->len != key->filter->len || | |
144 | memcmp(event->filter->data, key->filter->data, | |
145 | event->filter->len) != 0) { | |
146 | goto no_match; | |
147 | } | |
18eace3b DG |
148 | } |
149 | ||
1af53eb5 JI |
150 | /* One of the exclusions is NULL, fail. */ |
151 | if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) { | |
152 | goto no_match; | |
153 | } | |
154 | ||
155 | if (key->exclusion && event->exclusion) { | |
156 | /* Both exclusions exists, check count followed by the names. */ | |
157 | if (event->exclusion->count != key->exclusion->count || | |
158 | memcmp(event->exclusion->names, key->exclusion->names, | |
159 | event->exclusion->count * LTTNG_UST_SYM_NAME_LEN) != 0) { | |
160 | goto no_match; | |
161 | } | |
162 | } | |
163 | ||
164 | ||
025faf73 | 165 | /* Match. */ |
18eace3b DG |
166 | return 1; |
167 | ||
168 | no_match: | |
169 | return 0; | |
18eace3b DG |
170 | } |
171 | ||
025faf73 DG |
172 | /* |
173 | * Unique add of an ust app event in the given ht. This uses the custom | |
174 | * ht_match_ust_app_event match function and the event name as hash. | |
175 | */ | |
d0b96690 | 176 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
177 | struct ust_app_event *event) |
178 | { | |
179 | struct cds_lfht_node *node_ptr; | |
180 | struct ust_app_ht_key key; | |
d0b96690 | 181 | struct lttng_ht *ht; |
18eace3b | 182 | |
d0b96690 DG |
183 | assert(ua_chan); |
184 | assert(ua_chan->events); | |
18eace3b DG |
185 | assert(event); |
186 | ||
d0b96690 | 187 | ht = ua_chan->events; |
18eace3b DG |
188 | key.name = event->attr.name; |
189 | key.filter = event->filter; | |
2106efa0 | 190 | key.loglevel_type = event->attr.loglevel; |
91c89f23 | 191 | key.exclusion = event->exclusion; |
18eace3b DG |
192 | |
193 | node_ptr = cds_lfht_add_unique(ht->ht, | |
194 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
195 | ht_match_ust_app_event, &key, &event->node.node); | |
196 | assert(node_ptr == &event->node.node); | |
197 | } | |
198 | ||
d88aee68 DG |
199 | /* |
200 | * Close the notify socket from the given RCU head object. This MUST be called | |
201 | * through a call_rcu(). | |
202 | */ | |
203 | static void close_notify_sock_rcu(struct rcu_head *head) | |
204 | { | |
205 | int ret; | |
206 | struct ust_app_notify_sock_obj *obj = | |
207 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
208 | ||
209 | /* Must have a valid fd here. */ | |
210 | assert(obj->fd >= 0); | |
211 | ||
212 | ret = close(obj->fd); | |
213 | if (ret) { | |
214 | ERR("close notify sock %d RCU", obj->fd); | |
215 | } | |
216 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
217 | ||
218 | free(obj); | |
219 | } | |
220 | ||
7972aab2 DG |
221 | /* |
222 | * Return the session registry according to the buffer type of the given | |
223 | * session. | |
224 | * | |
225 | * A registry per UID object MUST exists before calling this function or else | |
226 | * it assert() if not found. RCU read side lock must be acquired. | |
227 | */ | |
228 | static struct ust_registry_session *get_session_registry( | |
229 | struct ust_app_session *ua_sess) | |
230 | { | |
231 | struct ust_registry_session *registry = NULL; | |
232 | ||
233 | assert(ua_sess); | |
234 | ||
235 | switch (ua_sess->buffer_type) { | |
236 | case LTTNG_BUFFER_PER_PID: | |
237 | { | |
238 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
239 | if (!reg_pid) { | |
240 | goto error; | |
241 | } | |
242 | registry = reg_pid->registry->reg.ust; | |
243 | break; | |
244 | } | |
245 | case LTTNG_BUFFER_PER_UID: | |
246 | { | |
247 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
248 | ua_sess->tracing_id, ua_sess->bits_per_long, ua_sess->uid); | |
249 | if (!reg_uid) { | |
250 | goto error; | |
251 | } | |
252 | registry = reg_uid->registry->reg.ust; | |
253 | break; | |
254 | } | |
255 | default: | |
256 | assert(0); | |
257 | }; | |
258 | ||
259 | error: | |
260 | return registry; | |
261 | } | |
262 | ||
55cc08a6 DG |
263 | /* |
264 | * Delete ust context safely. RCU read lock must be held before calling | |
265 | * this function. | |
266 | */ | |
267 | static | |
fb45065e MD |
268 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx, |
269 | struct ust_app *app) | |
55cc08a6 | 270 | { |
ffe60014 DG |
271 | int ret; |
272 | ||
273 | assert(ua_ctx); | |
274 | ||
55cc08a6 | 275 | if (ua_ctx->obj) { |
fb45065e | 276 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 277 | ret = ustctl_release_object(sock, ua_ctx->obj); |
fb45065e | 278 | pthread_mutex_unlock(&app->sock_lock); |
d0b96690 DG |
279 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
280 | ERR("UST app sock %d release ctx obj handle %d failed with ret %d", | |
281 | sock, ua_ctx->obj->handle, ret); | |
ffe60014 | 282 | } |
55cc08a6 DG |
283 | free(ua_ctx->obj); |
284 | } | |
285 | free(ua_ctx); | |
286 | } | |
287 | ||
d80a6244 DG |
288 | /* |
289 | * Delete ust app event safely. RCU read lock must be held before calling | |
290 | * this function. | |
291 | */ | |
8b366481 | 292 | static |
fb45065e MD |
293 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event, |
294 | struct ust_app *app) | |
d80a6244 | 295 | { |
ffe60014 DG |
296 | int ret; |
297 | ||
298 | assert(ua_event); | |
299 | ||
53a80697 | 300 | free(ua_event->filter); |
951f0b71 JI |
301 | if (ua_event->exclusion != NULL) |
302 | free(ua_event->exclusion); | |
edb67388 | 303 | if (ua_event->obj != NULL) { |
fb45065e | 304 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 305 | ret = ustctl_release_object(sock, ua_event->obj); |
fb45065e | 306 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
307 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
308 | ERR("UST app sock %d release event obj failed with ret %d", | |
309 | sock, ret); | |
310 | } | |
edb67388 DG |
311 | free(ua_event->obj); |
312 | } | |
d80a6244 DG |
313 | free(ua_event); |
314 | } | |
315 | ||
316 | /* | |
7972aab2 DG |
317 | * Release ust data object of the given stream. |
318 | * | |
319 | * Return 0 on success or else a negative value. | |
d80a6244 | 320 | */ |
fb45065e MD |
321 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream, |
322 | struct ust_app *app) | |
d80a6244 | 323 | { |
7972aab2 | 324 | int ret = 0; |
ffe60014 DG |
325 | |
326 | assert(stream); | |
327 | ||
8b366481 | 328 | if (stream->obj) { |
fb45065e | 329 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 330 | ret = ustctl_release_object(sock, stream->obj); |
fb45065e | 331 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
332 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
333 | ERR("UST app sock %d release stream obj failed with ret %d", | |
334 | sock, ret); | |
335 | } | |
4063050c | 336 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
337 | free(stream->obj); |
338 | } | |
7972aab2 DG |
339 | |
340 | return ret; | |
341 | } | |
342 | ||
343 | /* | |
344 | * Delete ust app stream safely. RCU read lock must be held before calling | |
345 | * this function. | |
346 | */ | |
347 | static | |
fb45065e MD |
348 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream, |
349 | struct ust_app *app) | |
7972aab2 DG |
350 | { |
351 | assert(stream); | |
352 | ||
fb45065e | 353 | (void) release_ust_app_stream(sock, stream, app); |
84cd17c6 | 354 | free(stream); |
d80a6244 DG |
355 | } |
356 | ||
36b588ed MD |
357 | /* |
358 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
359 | * section and outside of call_rcu thread, so we postpone its execution |
360 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
361 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
362 | */ |
363 | static | |
364 | void delete_ust_app_channel_rcu(struct rcu_head *head) | |
365 | { | |
366 | struct ust_app_channel *ua_chan = | |
367 | caa_container_of(head, struct ust_app_channel, rcu_head); | |
368 | ||
0b2dc8df MD |
369 | ht_cleanup_push(ua_chan->ctx); |
370 | ht_cleanup_push(ua_chan->events); | |
36b588ed MD |
371 | free(ua_chan); |
372 | } | |
373 | ||
d80a6244 DG |
374 | /* |
375 | * Delete ust app channel safely. RCU read lock must be held before calling | |
376 | * this function. | |
377 | */ | |
8b366481 | 378 | static |
d0b96690 DG |
379 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
380 | struct ust_app *app) | |
d80a6244 DG |
381 | { |
382 | int ret; | |
bec39940 | 383 | struct lttng_ht_iter iter; |
d80a6244 | 384 | struct ust_app_event *ua_event; |
55cc08a6 | 385 | struct ust_app_ctx *ua_ctx; |
030a66fa | 386 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 387 | struct ust_registry_session *registry; |
d80a6244 | 388 | |
ffe60014 DG |
389 | assert(ua_chan); |
390 | ||
391 | DBG3("UST app deleting channel %s", ua_chan->name); | |
392 | ||
55cc08a6 | 393 | /* Wipe stream */ |
d80a6244 | 394 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 395 | cds_list_del(&stream->list); |
fb45065e | 396 | delete_ust_app_stream(sock, stream, app); |
d80a6244 DG |
397 | } |
398 | ||
55cc08a6 | 399 | /* Wipe context */ |
bec39940 | 400 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
31746f93 | 401 | cds_list_del(&ua_ctx->list); |
bec39940 | 402 | ret = lttng_ht_del(ua_chan->ctx, &iter); |
55cc08a6 | 403 | assert(!ret); |
fb45065e | 404 | delete_ust_app_ctx(sock, ua_ctx, app); |
55cc08a6 | 405 | } |
d80a6244 | 406 | |
55cc08a6 | 407 | /* Wipe events */ |
bec39940 DG |
408 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
409 | node.node) { | |
410 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 411 | assert(!ret); |
fb45065e | 412 | delete_ust_app_event(sock, ua_event, app); |
d80a6244 | 413 | } |
edb67388 | 414 | |
c8335706 MD |
415 | if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) { |
416 | /* Wipe and free registry from session registry. */ | |
417 | registry = get_session_registry(ua_chan->session); | |
418 | if (registry) { | |
419 | ust_registry_channel_del_free(registry, ua_chan->key); | |
420 | } | |
7972aab2 | 421 | } |
d0b96690 | 422 | |
edb67388 | 423 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
424 | /* Remove channel from application UST object descriptor. */ |
425 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
c6e62271 DG |
426 | ret = lttng_ht_del(app->ust_objd, &iter); |
427 | assert(!ret); | |
fb45065e | 428 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 429 | ret = ustctl_release_object(sock, ua_chan->obj); |
fb45065e | 430 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
431 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
432 | ERR("UST app sock %d release channel obj failed with ret %d", | |
433 | sock, ret); | |
434 | } | |
7972aab2 | 435 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
436 | free(ua_chan->obj); |
437 | } | |
36b588ed | 438 | call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); |
d80a6244 DG |
439 | } |
440 | ||
fb45065e MD |
441 | int ust_app_register_done(struct ust_app *app) |
442 | { | |
443 | int ret; | |
444 | ||
445 | pthread_mutex_lock(&app->sock_lock); | |
446 | ret = ustctl_register_done(app->sock); | |
447 | pthread_mutex_unlock(&app->sock_lock); | |
448 | return ret; | |
449 | } | |
450 | ||
451 | int ust_app_release_object(struct ust_app *app, struct lttng_ust_object_data *data) | |
452 | { | |
453 | int ret, sock; | |
454 | ||
455 | if (app) { | |
456 | pthread_mutex_lock(&app->sock_lock); | |
457 | sock = app->sock; | |
458 | } else { | |
459 | sock = -1; | |
460 | } | |
461 | ret = ustctl_release_object(sock, data); | |
462 | if (app) { | |
463 | pthread_mutex_unlock(&app->sock_lock); | |
464 | } | |
465 | return ret; | |
466 | } | |
467 | ||
331744e3 | 468 | /* |
1b532a60 DG |
469 | * Push metadata to consumer socket. |
470 | * | |
dc2bbdae MD |
471 | * RCU read-side lock must be held to guarantee existance of socket. |
472 | * Must be called with the ust app session lock held. | |
473 | * Must be called with the registry lock held. | |
331744e3 JD |
474 | * |
475 | * On success, return the len of metadata pushed or else a negative value. | |
2c57e06d MD |
476 | * Returning a -EPIPE return value means we could not send the metadata, |
477 | * but it can be caused by recoverable errors (e.g. the application has | |
478 | * terminated concurrently). | |
331744e3 JD |
479 | */ |
480 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
481 | struct consumer_socket *socket, int send_zero_data) | |
482 | { | |
483 | int ret; | |
484 | char *metadata_str = NULL; | |
c585821b | 485 | size_t len, offset, new_metadata_len_sent; |
331744e3 | 486 | ssize_t ret_val; |
c585821b | 487 | uint64_t metadata_key; |
331744e3 JD |
488 | |
489 | assert(registry); | |
490 | assert(socket); | |
1b532a60 | 491 | |
c585821b MD |
492 | metadata_key = registry->metadata_key; |
493 | ||
ce34fcd0 | 494 | /* |
dc2bbdae MD |
495 | * Means that no metadata was assigned to the session. This can |
496 | * happens if no start has been done previously. | |
ce34fcd0 | 497 | */ |
c585821b | 498 | if (!metadata_key) { |
ce34fcd0 MD |
499 | return 0; |
500 | } | |
501 | ||
1b532a60 | 502 | /* |
dc2bbdae MD |
503 | * On a push metadata error either the consumer is dead or the |
504 | * metadata channel has been destroyed because its endpoint | |
2c57e06d MD |
505 | * might have died (e.g: relayd), or because the application has |
506 | * exited. If so, the metadata closed flag is set to 1 so we | |
507 | * deny pushing metadata again which is not valid anymore on the | |
508 | * consumer side. | |
1b532a60 DG |
509 | */ |
510 | if (registry->metadata_closed) { | |
511 | return -EPIPE; | |
512 | } | |
331744e3 | 513 | |
331744e3 JD |
514 | offset = registry->metadata_len_sent; |
515 | len = registry->metadata_len - registry->metadata_len_sent; | |
c585821b | 516 | new_metadata_len_sent = registry->metadata_len; |
331744e3 JD |
517 | if (len == 0) { |
518 | DBG3("No metadata to push for metadata key %" PRIu64, | |
519 | registry->metadata_key); | |
520 | ret_val = len; | |
521 | if (send_zero_data) { | |
522 | DBG("No metadata to push"); | |
523 | goto push_data; | |
524 | } | |
525 | goto end; | |
526 | } | |
527 | ||
528 | /* Allocate only what we have to send. */ | |
529 | metadata_str = zmalloc(len); | |
530 | if (!metadata_str) { | |
531 | PERROR("zmalloc ust app metadata string"); | |
532 | ret_val = -ENOMEM; | |
533 | goto error; | |
534 | } | |
c585821b | 535 | /* Copy what we haven't sent out. */ |
331744e3 | 536 | memcpy(metadata_str, registry->metadata + offset, len); |
331744e3 JD |
537 | |
538 | push_data: | |
c585821b MD |
539 | pthread_mutex_unlock(®istry->lock); |
540 | /* | |
541 | * We need to unlock the registry while we push metadata to | |
542 | * break a circular dependency between the consumerd metadata | |
543 | * lock and the sessiond registry lock. Indeed, pushing metadata | |
544 | * to the consumerd awaits that it gets pushed all the way to | |
545 | * relayd, but doing so requires grabbing the metadata lock. If | |
546 | * a concurrent metadata request is being performed by | |
547 | * consumerd, this can try to grab the registry lock on the | |
548 | * sessiond while holding the metadata lock on the consumer | |
549 | * daemon. Those push and pull schemes are performed on two | |
550 | * different bidirectionnal communication sockets. | |
551 | */ | |
552 | ret = consumer_push_metadata(socket, metadata_key, | |
331744e3 | 553 | metadata_str, len, offset); |
c585821b | 554 | pthread_mutex_lock(®istry->lock); |
331744e3 | 555 | if (ret < 0) { |
000baf6a | 556 | /* |
dc2bbdae MD |
557 | * There is an acceptable race here between the registry |
558 | * metadata key assignment and the creation on the | |
559 | * consumer. The session daemon can concurrently push | |
560 | * metadata for this registry while being created on the | |
561 | * consumer since the metadata key of the registry is | |
562 | * assigned *before* it is setup to avoid the consumer | |
563 | * to ask for metadata that could possibly be not found | |
564 | * in the session daemon. | |
000baf6a | 565 | * |
dc2bbdae MD |
566 | * The metadata will get pushed either by the session |
567 | * being stopped or the consumer requesting metadata if | |
568 | * that race is triggered. | |
000baf6a DG |
569 | */ |
570 | if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) { | |
571 | ret = 0; | |
c585821b MD |
572 | } else { |
573 | ERR("Error pushing metadata to consumer"); | |
000baf6a | 574 | } |
331744e3 JD |
575 | ret_val = ret; |
576 | goto error_push; | |
c585821b MD |
577 | } else { |
578 | /* | |
579 | * Metadata may have been concurrently pushed, since | |
580 | * we're not holding the registry lock while pushing to | |
581 | * consumer. This is handled by the fact that we send | |
582 | * the metadata content, size, and the offset at which | |
583 | * that metadata belongs. This may arrive out of order | |
584 | * on the consumer side, and the consumer is able to | |
585 | * deal with overlapping fragments. The consumer | |
586 | * supports overlapping fragments, which must be | |
587 | * contiguous starting from offset 0. We keep the | |
588 | * largest metadata_len_sent value of the concurrent | |
589 | * send. | |
590 | */ | |
591 | registry->metadata_len_sent = | |
592 | max_t(size_t, registry->metadata_len_sent, | |
593 | new_metadata_len_sent); | |
331744e3 | 594 | } |
331744e3 JD |
595 | free(metadata_str); |
596 | return len; | |
597 | ||
598 | end: | |
599 | error: | |
ce34fcd0 MD |
600 | if (ret_val) { |
601 | /* | |
dc2bbdae MD |
602 | * On error, flag the registry that the metadata is |
603 | * closed. We were unable to push anything and this | |
604 | * means that either the consumer is not responding or | |
605 | * the metadata cache has been destroyed on the | |
606 | * consumer. | |
ce34fcd0 MD |
607 | */ |
608 | registry->metadata_closed = 1; | |
609 | } | |
331744e3 JD |
610 | error_push: |
611 | free(metadata_str); | |
612 | return ret_val; | |
613 | } | |
614 | ||
d88aee68 | 615 | /* |
ce34fcd0 | 616 | * For a given application and session, push metadata to consumer. |
331744e3 JD |
617 | * Either sock or consumer is required : if sock is NULL, the default |
618 | * socket to send the metadata is retrieved from consumer, if sock | |
619 | * is not NULL we use it to send the metadata. | |
ce34fcd0 | 620 | * RCU read-side lock must be held while calling this function, |
dc2bbdae MD |
621 | * therefore ensuring existance of registry. It also ensures existance |
622 | * of socket throughout this function. | |
d88aee68 DG |
623 | * |
624 | * Return 0 on success else a negative error. | |
2c57e06d MD |
625 | * Returning a -EPIPE return value means we could not send the metadata, |
626 | * but it can be caused by recoverable errors (e.g. the application has | |
627 | * terminated concurrently). | |
d88aee68 | 628 | */ |
7972aab2 DG |
629 | static int push_metadata(struct ust_registry_session *registry, |
630 | struct consumer_output *consumer) | |
d88aee68 | 631 | { |
331744e3 JD |
632 | int ret_val; |
633 | ssize_t ret; | |
d88aee68 DG |
634 | struct consumer_socket *socket; |
635 | ||
7972aab2 DG |
636 | assert(registry); |
637 | assert(consumer); | |
638 | ||
ce34fcd0 | 639 | pthread_mutex_lock(®istry->lock); |
ce34fcd0 | 640 | if (registry->metadata_closed) { |
dc2bbdae MD |
641 | ret_val = -EPIPE; |
642 | goto error; | |
d88aee68 DG |
643 | } |
644 | ||
d88aee68 | 645 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
646 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
647 | consumer); | |
d88aee68 | 648 | if (!socket) { |
331744e3 | 649 | ret_val = -1; |
ce34fcd0 | 650 | goto error; |
d88aee68 DG |
651 | } |
652 | ||
331744e3 | 653 | ret = ust_app_push_metadata(registry, socket, 0); |
d88aee68 | 654 | if (ret < 0) { |
331744e3 | 655 | ret_val = ret; |
ce34fcd0 | 656 | goto error; |
d88aee68 | 657 | } |
dc2bbdae | 658 | pthread_mutex_unlock(®istry->lock); |
d88aee68 DG |
659 | return 0; |
660 | ||
ce34fcd0 | 661 | error: |
dc2bbdae | 662 | pthread_mutex_unlock(®istry->lock); |
331744e3 | 663 | return ret_val; |
d88aee68 DG |
664 | } |
665 | ||
666 | /* | |
667 | * Send to the consumer a close metadata command for the given session. Once | |
668 | * done, the metadata channel is deleted and the session metadata pointer is | |
dc2bbdae | 669 | * nullified. The session lock MUST be held unless the application is |
d88aee68 DG |
670 | * in the destroy path. |
671 | * | |
672 | * Return 0 on success else a negative value. | |
673 | */ | |
7972aab2 DG |
674 | static int close_metadata(struct ust_registry_session *registry, |
675 | struct consumer_output *consumer) | |
d88aee68 DG |
676 | { |
677 | int ret; | |
678 | struct consumer_socket *socket; | |
679 | ||
7972aab2 DG |
680 | assert(registry); |
681 | assert(consumer); | |
d88aee68 | 682 | |
7972aab2 DG |
683 | rcu_read_lock(); |
684 | ||
ce34fcd0 MD |
685 | pthread_mutex_lock(®istry->lock); |
686 | ||
7972aab2 | 687 | if (!registry->metadata_key || registry->metadata_closed) { |
d88aee68 | 688 | ret = 0; |
1b532a60 | 689 | goto end; |
d88aee68 DG |
690 | } |
691 | ||
d88aee68 | 692 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
693 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
694 | consumer); | |
d88aee68 DG |
695 | if (!socket) { |
696 | ret = -1; | |
7972aab2 | 697 | goto error; |
d88aee68 DG |
698 | } |
699 | ||
7972aab2 | 700 | ret = consumer_close_metadata(socket, registry->metadata_key); |
d88aee68 | 701 | if (ret < 0) { |
7972aab2 | 702 | goto error; |
d88aee68 DG |
703 | } |
704 | ||
d88aee68 | 705 | error: |
1b532a60 DG |
706 | /* |
707 | * Metadata closed. Even on error this means that the consumer is not | |
708 | * responding or not found so either way a second close should NOT be emit | |
709 | * for this registry. | |
710 | */ | |
711 | registry->metadata_closed = 1; | |
712 | end: | |
ce34fcd0 | 713 | pthread_mutex_unlock(®istry->lock); |
7972aab2 | 714 | rcu_read_unlock(); |
d88aee68 DG |
715 | return ret; |
716 | } | |
717 | ||
36b588ed MD |
718 | /* |
719 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
720 | * section and outside of call_rcu thread, so we postpone its execution |
721 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
722 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
723 | */ |
724 | static | |
725 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
726 | { | |
727 | struct ust_app_session *ua_sess = | |
728 | caa_container_of(head, struct ust_app_session, rcu_head); | |
729 | ||
0b2dc8df | 730 | ht_cleanup_push(ua_sess->channels); |
36b588ed MD |
731 | free(ua_sess); |
732 | } | |
733 | ||
d80a6244 DG |
734 | /* |
735 | * Delete ust app session safely. RCU read lock must be held before calling | |
736 | * this function. | |
737 | */ | |
8b366481 | 738 | static |
d0b96690 DG |
739 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
740 | struct ust_app *app) | |
d80a6244 DG |
741 | { |
742 | int ret; | |
bec39940 | 743 | struct lttng_ht_iter iter; |
d80a6244 | 744 | struct ust_app_channel *ua_chan; |
7972aab2 | 745 | struct ust_registry_session *registry; |
d80a6244 | 746 | |
d88aee68 DG |
747 | assert(ua_sess); |
748 | ||
1b532a60 DG |
749 | pthread_mutex_lock(&ua_sess->lock); |
750 | ||
b161602a MD |
751 | assert(!ua_sess->deleted); |
752 | ua_sess->deleted = true; | |
753 | ||
7972aab2 | 754 | registry = get_session_registry(ua_sess); |
ce34fcd0 | 755 | if (registry) { |
d88aee68 | 756 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 757 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 758 | |
7972aab2 DG |
759 | /* |
760 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
761 | * metadata only on destroy trace session in this case. Also, the |
762 | * previous push metadata could have flag the metadata registry to | |
763 | * close so don't send a close command if closed. | |
7972aab2 | 764 | */ |
ce34fcd0 | 765 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
766 | /* And ask to close it for this session registry. */ |
767 | (void) close_metadata(registry, ua_sess->consumer); | |
768 | } | |
d80a6244 DG |
769 | } |
770 | ||
bec39940 DG |
771 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
772 | node.node) { | |
773 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 774 | assert(!ret); |
d0b96690 | 775 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 776 | } |
d80a6244 | 777 | |
7972aab2 DG |
778 | /* In case of per PID, the registry is kept in the session. */ |
779 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
780 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
781 | if (reg_pid) { | |
782 | buffer_reg_pid_remove(reg_pid); | |
783 | buffer_reg_pid_destroy(reg_pid); | |
784 | } | |
785 | } | |
d0b96690 | 786 | |
aee6bafd | 787 | if (ua_sess->handle != -1) { |
fb45065e | 788 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 789 | ret = ustctl_release_handle(sock, ua_sess->handle); |
fb45065e | 790 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
791 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
792 | ERR("UST app sock %d release session handle failed with ret %d", | |
793 | sock, ret); | |
794 | } | |
10b56aef MD |
795 | /* Remove session from application UST object descriptor. */ |
796 | iter.iter.node = &ua_sess->ust_objd_node.node; | |
797 | ret = lttng_ht_del(app->ust_sessions_objd, &iter); | |
798 | assert(!ret); | |
aee6bafd | 799 | } |
10b56aef | 800 | |
1b532a60 DG |
801 | pthread_mutex_unlock(&ua_sess->lock); |
802 | ||
6addfa37 MD |
803 | consumer_output_put(ua_sess->consumer); |
804 | ||
36b588ed | 805 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 806 | } |
91d76f53 DG |
807 | |
808 | /* | |
284d8f55 DG |
809 | * Delete a traceable application structure from the global list. Never call |
810 | * this function outside of a call_rcu call. | |
36b588ed MD |
811 | * |
812 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 813 | */ |
8b366481 DG |
814 | static |
815 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 816 | { |
8b366481 | 817 | int ret, sock; |
d42f20df | 818 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 819 | |
d80a6244 | 820 | /* Delete ust app sessions info */ |
852d0037 DG |
821 | sock = app->sock; |
822 | app->sock = -1; | |
d80a6244 | 823 | |
8b366481 | 824 | /* Wipe sessions */ |
d42f20df DG |
825 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
826 | teardown_node) { | |
827 | /* Free every object in the session and the session. */ | |
36b588ed | 828 | rcu_read_lock(); |
d0b96690 | 829 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 830 | rcu_read_unlock(); |
d80a6244 | 831 | } |
36b588ed | 832 | |
0b2dc8df | 833 | ht_cleanup_push(app->sessions); |
10b56aef | 834 | ht_cleanup_push(app->ust_sessions_objd); |
0b2dc8df | 835 | ht_cleanup_push(app->ust_objd); |
d80a6244 | 836 | |
6414a713 | 837 | /* |
852d0037 DG |
838 | * Wait until we have deleted the application from the sock hash table |
839 | * before closing this socket, otherwise an application could re-use the | |
840 | * socket ID and race with the teardown, using the same hash table entry. | |
841 | * | |
842 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
843 | * all RCU readers that could run concurrently with unregister app, | |
844 | * therefore we _need_ to only close that socket after a grace period. So | |
845 | * it should stay in this RCU callback. | |
846 | * | |
847 | * This close() is a very important step of the synchronization model so | |
848 | * every modification to this function must be carefully reviewed. | |
6414a713 | 849 | */ |
799e2c4f MD |
850 | ret = close(sock); |
851 | if (ret) { | |
852 | PERROR("close"); | |
853 | } | |
4063050c | 854 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 855 | |
852d0037 | 856 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 857 | free(app); |
099e26bd DG |
858 | } |
859 | ||
860 | /* | |
f6a9efaa | 861 | * URCU intermediate call to delete an UST app. |
099e26bd | 862 | */ |
8b366481 DG |
863 | static |
864 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 865 | { |
bec39940 DG |
866 | struct lttng_ht_node_ulong *node = |
867 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 868 | struct ust_app *app = |
852d0037 | 869 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 870 | |
852d0037 | 871 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 872 | delete_ust_app(app); |
099e26bd DG |
873 | } |
874 | ||
ffe60014 DG |
875 | /* |
876 | * Delete the session from the application ht and delete the data structure by | |
877 | * freeing every object inside and releasing them. | |
878 | */ | |
d0b96690 | 879 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
880 | struct ust_app_session *ua_sess) |
881 | { | |
882 | int ret; | |
883 | struct lttng_ht_iter iter; | |
884 | ||
885 | assert(app); | |
886 | assert(ua_sess); | |
887 | ||
888 | iter.iter.node = &ua_sess->node.node; | |
889 | ret = lttng_ht_del(app->sessions, &iter); | |
890 | if (ret) { | |
891 | /* Already scheduled for teardown. */ | |
892 | goto end; | |
893 | } | |
894 | ||
895 | /* Once deleted, free the data structure. */ | |
d0b96690 | 896 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
897 | |
898 | end: | |
899 | return; | |
900 | } | |
901 | ||
8b366481 DG |
902 | /* |
903 | * Alloc new UST app session. | |
904 | */ | |
905 | static | |
d0b96690 | 906 | struct ust_app_session *alloc_ust_app_session(struct ust_app *app) |
8b366481 DG |
907 | { |
908 | struct ust_app_session *ua_sess; | |
909 | ||
910 | /* Init most of the default value by allocating and zeroing */ | |
911 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
912 | if (ua_sess == NULL) { | |
913 | PERROR("malloc"); | |
ffe60014 | 914 | goto error_free; |
8b366481 DG |
915 | } |
916 | ||
917 | ua_sess->handle = -1; | |
bec39940 | 918 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
ad7a9107 | 919 | ua_sess->metadata_attr.type = LTTNG_UST_CHAN_METADATA; |
84ad93e8 | 920 | pthread_mutex_init(&ua_sess->lock, NULL); |
ad7a9107 | 921 | |
8b366481 DG |
922 | return ua_sess; |
923 | ||
ffe60014 | 924 | error_free: |
8b366481 DG |
925 | return NULL; |
926 | } | |
927 | ||
928 | /* | |
929 | * Alloc new UST app channel. | |
930 | */ | |
931 | static | |
932 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 933 | struct ust_app_session *ua_sess, |
ffe60014 | 934 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
935 | { |
936 | struct ust_app_channel *ua_chan; | |
937 | ||
938 | /* Init most of the default value by allocating and zeroing */ | |
939 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
940 | if (ua_chan == NULL) { | |
941 | PERROR("malloc"); | |
942 | goto error; | |
943 | } | |
944 | ||
945 | /* Setup channel name */ | |
946 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
947 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
948 | ||
949 | ua_chan->enabled = 1; | |
950 | ua_chan->handle = -1; | |
45893984 | 951 | ua_chan->session = ua_sess; |
ffe60014 | 952 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
953 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
954 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
955 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
956 | |
957 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
31746f93 | 958 | CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); |
8b366481 DG |
959 | |
960 | /* Copy attributes */ | |
961 | if (attr) { | |
ffe60014 | 962 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
963 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
964 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
965 | ua_chan->attr.overwrite = attr->overwrite; | |
966 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
967 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
968 | ua_chan->attr.output = attr->output; | |
8b366481 | 969 | } |
ffe60014 DG |
970 | /* By default, the channel is a per cpu channel. */ |
971 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
972 | |
973 | DBG3("UST app channel %s allocated", ua_chan->name); | |
974 | ||
975 | return ua_chan; | |
976 | ||
977 | error: | |
978 | return NULL; | |
979 | } | |
980 | ||
37f1c236 DG |
981 | /* |
982 | * Allocate and initialize a UST app stream. | |
983 | * | |
984 | * Return newly allocated stream pointer or NULL on error. | |
985 | */ | |
ffe60014 | 986 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
987 | { |
988 | struct ust_app_stream *stream = NULL; | |
989 | ||
990 | stream = zmalloc(sizeof(*stream)); | |
991 | if (stream == NULL) { | |
992 | PERROR("zmalloc ust app stream"); | |
993 | goto error; | |
994 | } | |
995 | ||
996 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
997 | stream->handle = -1; | |
998 | ||
999 | error: | |
1000 | return stream; | |
1001 | } | |
1002 | ||
8b366481 DG |
1003 | /* |
1004 | * Alloc new UST app event. | |
1005 | */ | |
1006 | static | |
1007 | struct ust_app_event *alloc_ust_app_event(char *name, | |
1008 | struct lttng_ust_event *attr) | |
1009 | { | |
1010 | struct ust_app_event *ua_event; | |
1011 | ||
1012 | /* Init most of the default value by allocating and zeroing */ | |
1013 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
1014 | if (ua_event == NULL) { | |
1015 | PERROR("malloc"); | |
1016 | goto error; | |
1017 | } | |
1018 | ||
1019 | ua_event->enabled = 1; | |
1020 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
1021 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 1022 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
1023 | |
1024 | /* Copy attributes */ | |
1025 | if (attr) { | |
1026 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
1027 | } | |
1028 | ||
1029 | DBG3("UST app event %s allocated", ua_event->name); | |
1030 | ||
1031 | return ua_event; | |
1032 | ||
1033 | error: | |
1034 | return NULL; | |
1035 | } | |
1036 | ||
1037 | /* | |
1038 | * Alloc new UST app context. | |
1039 | */ | |
1040 | static | |
bdf64013 | 1041 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context_attr *uctx) |
8b366481 DG |
1042 | { |
1043 | struct ust_app_ctx *ua_ctx; | |
1044 | ||
1045 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
1046 | if (ua_ctx == NULL) { | |
1047 | goto error; | |
1048 | } | |
1049 | ||
31746f93 DG |
1050 | CDS_INIT_LIST_HEAD(&ua_ctx->list); |
1051 | ||
8b366481 DG |
1052 | if (uctx) { |
1053 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
bdf64013 JG |
1054 | if (uctx->ctx == LTTNG_UST_CONTEXT_APP_CONTEXT) { |
1055 | char *provider_name = NULL, *ctx_name = NULL; | |
1056 | ||
1057 | provider_name = strdup(uctx->u.app_ctx.provider_name); | |
1058 | ctx_name = strdup(uctx->u.app_ctx.ctx_name); | |
1059 | if (!provider_name || !ctx_name) { | |
1060 | free(provider_name); | |
1061 | free(ctx_name); | |
1062 | goto error; | |
1063 | } | |
1064 | ||
1065 | ua_ctx->ctx.u.app_ctx.provider_name = provider_name; | |
1066 | ua_ctx->ctx.u.app_ctx.ctx_name = ctx_name; | |
1067 | } | |
8b366481 DG |
1068 | } |
1069 | ||
1070 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
8b366481 | 1071 | return ua_ctx; |
bdf64013 JG |
1072 | error: |
1073 | free(ua_ctx); | |
1074 | return NULL; | |
8b366481 DG |
1075 | } |
1076 | ||
025faf73 DG |
1077 | /* |
1078 | * Allocate a filter and copy the given original filter. | |
1079 | * | |
1080 | * Return allocated filter or NULL on error. | |
1081 | */ | |
51755dc8 JG |
1082 | static struct lttng_filter_bytecode *copy_filter_bytecode( |
1083 | struct lttng_filter_bytecode *orig_f) | |
025faf73 | 1084 | { |
51755dc8 | 1085 | struct lttng_filter_bytecode *filter = NULL; |
025faf73 DG |
1086 | |
1087 | /* Copy filter bytecode */ | |
1088 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
1089 | if (!filter) { | |
51755dc8 | 1090 | PERROR("zmalloc alloc filter bytecode"); |
025faf73 DG |
1091 | goto error; |
1092 | } | |
1093 | ||
1094 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
1095 | ||
1096 | error: | |
1097 | return filter; | |
1098 | } | |
1099 | ||
51755dc8 JG |
1100 | /* |
1101 | * Create a liblttng-ust filter bytecode from given bytecode. | |
1102 | * | |
1103 | * Return allocated filter or NULL on error. | |
1104 | */ | |
1105 | static struct lttng_ust_filter_bytecode *create_ust_bytecode_from_bytecode( | |
1106 | struct lttng_filter_bytecode *orig_f) | |
1107 | { | |
1108 | struct lttng_ust_filter_bytecode *filter = NULL; | |
1109 | ||
1110 | /* Copy filter bytecode */ | |
1111 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
1112 | if (!filter) { | |
1113 | PERROR("zmalloc alloc ust filter bytecode"); | |
1114 | goto error; | |
1115 | } | |
1116 | ||
1117 | assert(sizeof(struct lttng_filter_bytecode) == | |
1118 | sizeof(struct lttng_ust_filter_bytecode)); | |
1119 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
1120 | error: | |
1121 | return filter; | |
1122 | } | |
1123 | ||
099e26bd | 1124 | /* |
421cb601 DG |
1125 | * Find an ust_app using the sock and return it. RCU read side lock must be |
1126 | * held before calling this helper function. | |
099e26bd | 1127 | */ |
f20baf8e | 1128 | struct ust_app *ust_app_find_by_sock(int sock) |
099e26bd | 1129 | { |
bec39940 | 1130 | struct lttng_ht_node_ulong *node; |
bec39940 | 1131 | struct lttng_ht_iter iter; |
f6a9efaa | 1132 | |
852d0037 | 1133 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 1134 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
1135 | if (node == NULL) { |
1136 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
1137 | goto error; |
1138 | } | |
852d0037 DG |
1139 | |
1140 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
1141 | |
1142 | error: | |
1143 | return NULL; | |
099e26bd DG |
1144 | } |
1145 | ||
d0b96690 DG |
1146 | /* |
1147 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
1148 | * be held before calling this helper function. | |
1149 | */ | |
1150 | static struct ust_app *find_app_by_notify_sock(int sock) | |
1151 | { | |
1152 | struct lttng_ht_node_ulong *node; | |
1153 | struct lttng_ht_iter iter; | |
1154 | ||
1155 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
1156 | &iter); | |
1157 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1158 | if (node == NULL) { | |
1159 | DBG2("UST app find by notify sock %d not found", sock); | |
1160 | goto error; | |
1161 | } | |
1162 | ||
1163 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
1164 | ||
1165 | error: | |
1166 | return NULL; | |
1167 | } | |
1168 | ||
025faf73 DG |
1169 | /* |
1170 | * Lookup for an ust app event based on event name, filter bytecode and the | |
1171 | * event loglevel. | |
1172 | * | |
1173 | * Return an ust_app_event object or NULL on error. | |
1174 | */ | |
18eace3b | 1175 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
2106efa0 PP |
1176 | char *name, struct lttng_filter_bytecode *filter, |
1177 | int loglevel_value, | |
39c5a3a7 | 1178 | const struct lttng_event_exclusion *exclusion) |
18eace3b DG |
1179 | { |
1180 | struct lttng_ht_iter iter; | |
1181 | struct lttng_ht_node_str *node; | |
1182 | struct ust_app_event *event = NULL; | |
1183 | struct ust_app_ht_key key; | |
18eace3b DG |
1184 | |
1185 | assert(name); | |
1186 | assert(ht); | |
1187 | ||
1188 | /* Setup key for event lookup. */ | |
1189 | key.name = name; | |
1190 | key.filter = filter; | |
2106efa0 | 1191 | key.loglevel_type = loglevel_value; |
39c5a3a7 | 1192 | /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */ |
51755dc8 | 1193 | key.exclusion = exclusion; |
18eace3b | 1194 | |
025faf73 DG |
1195 | /* Lookup using the event name as hash and a custom match fct. */ |
1196 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1197 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1198 | node = lttng_ht_iter_get_node_str(&iter); |
1199 | if (node == NULL) { | |
1200 | goto end; | |
1201 | } | |
1202 | ||
1203 | event = caa_container_of(node, struct ust_app_event, node); | |
1204 | ||
1205 | end: | |
18eace3b DG |
1206 | return event; |
1207 | } | |
1208 | ||
55cc08a6 DG |
1209 | /* |
1210 | * Create the channel context on the tracer. | |
d0b96690 DG |
1211 | * |
1212 | * Called with UST app session lock held. | |
55cc08a6 DG |
1213 | */ |
1214 | static | |
1215 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1216 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1217 | { | |
1218 | int ret; | |
1219 | ||
840cb59c | 1220 | health_code_update(); |
86acf0da | 1221 | |
fb45065e | 1222 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1223 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 | 1224 | ua_chan->obj, &ua_ctx->obj); |
fb45065e | 1225 | pthread_mutex_unlock(&app->sock_lock); |
55cc08a6 | 1226 | if (ret < 0) { |
ffe60014 DG |
1227 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1228 | ERR("UST app create channel context failed for app (pid: %d) " | |
1229 | "with ret %d", app->pid, ret); | |
1230 | } else { | |
3757b385 DG |
1231 | /* |
1232 | * This is normal behavior, an application can die during the | |
1233 | * creation process. Don't report an error so the execution can | |
1234 | * continue normally. | |
1235 | */ | |
1236 | ret = 0; | |
ffe60014 DG |
1237 | DBG3("UST app disable event failed. Application is dead."); |
1238 | } | |
55cc08a6 DG |
1239 | goto error; |
1240 | } | |
1241 | ||
1242 | ua_ctx->handle = ua_ctx->obj->handle; | |
1243 | ||
d0b96690 DG |
1244 | DBG2("UST app context handle %d created successfully for channel %s", |
1245 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1246 | |
1247 | error: | |
840cb59c | 1248 | health_code_update(); |
55cc08a6 DG |
1249 | return ret; |
1250 | } | |
1251 | ||
53a80697 MD |
1252 | /* |
1253 | * Set the filter on the tracer. | |
1254 | */ | |
1255 | static | |
1256 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
1257 | struct ust_app *app) | |
1258 | { | |
1259 | int ret; | |
51755dc8 | 1260 | struct lttng_ust_filter_bytecode *ust_bytecode = NULL; |
53a80697 | 1261 | |
840cb59c | 1262 | health_code_update(); |
86acf0da | 1263 | |
53a80697 | 1264 | if (!ua_event->filter) { |
86acf0da DG |
1265 | ret = 0; |
1266 | goto error; | |
53a80697 MD |
1267 | } |
1268 | ||
51755dc8 JG |
1269 | ust_bytecode = create_ust_bytecode_from_bytecode(ua_event->filter); |
1270 | if (!ust_bytecode) { | |
1271 | ret = -LTTNG_ERR_NOMEM; | |
1272 | goto error; | |
1273 | } | |
fb45065e | 1274 | pthread_mutex_lock(&app->sock_lock); |
51755dc8 | 1275 | ret = ustctl_set_filter(app->sock, ust_bytecode, |
53a80697 | 1276 | ua_event->obj); |
fb45065e | 1277 | pthread_mutex_unlock(&app->sock_lock); |
53a80697 | 1278 | if (ret < 0) { |
ffe60014 DG |
1279 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1280 | ERR("UST app event %s filter failed for app (pid: %d) " | |
1281 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1282 | } else { | |
3757b385 DG |
1283 | /* |
1284 | * This is normal behavior, an application can die during the | |
1285 | * creation process. Don't report an error so the execution can | |
1286 | * continue normally. | |
1287 | */ | |
1288 | ret = 0; | |
ffe60014 DG |
1289 | DBG3("UST app filter event failed. Application is dead."); |
1290 | } | |
53a80697 MD |
1291 | goto error; |
1292 | } | |
1293 | ||
1294 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
1295 | ||
1296 | error: | |
840cb59c | 1297 | health_code_update(); |
51755dc8 | 1298 | free(ust_bytecode); |
53a80697 MD |
1299 | return ret; |
1300 | } | |
1301 | ||
51755dc8 JG |
1302 | static |
1303 | struct lttng_ust_event_exclusion *create_ust_exclusion_from_exclusion( | |
1304 | struct lttng_event_exclusion *exclusion) | |
1305 | { | |
1306 | struct lttng_ust_event_exclusion *ust_exclusion = NULL; | |
1307 | size_t exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) + | |
1308 | LTTNG_UST_SYM_NAME_LEN * exclusion->count; | |
1309 | ||
1310 | ust_exclusion = zmalloc(exclusion_alloc_size); | |
1311 | if (!ust_exclusion) { | |
1312 | PERROR("malloc"); | |
1313 | goto end; | |
1314 | } | |
1315 | ||
1316 | assert(sizeof(struct lttng_event_exclusion) == | |
1317 | sizeof(struct lttng_ust_event_exclusion)); | |
1318 | memcpy(ust_exclusion, exclusion, exclusion_alloc_size); | |
1319 | end: | |
1320 | return ust_exclusion; | |
1321 | } | |
1322 | ||
7cc9a73c JI |
1323 | /* |
1324 | * Set event exclusions on the tracer. | |
1325 | */ | |
1326 | static | |
1327 | int set_ust_event_exclusion(struct ust_app_event *ua_event, | |
1328 | struct ust_app *app) | |
1329 | { | |
1330 | int ret; | |
51755dc8 | 1331 | struct lttng_ust_event_exclusion *ust_exclusion = NULL; |
7cc9a73c JI |
1332 | |
1333 | health_code_update(); | |
1334 | ||
1335 | if (!ua_event->exclusion || !ua_event->exclusion->count) { | |
1336 | ret = 0; | |
1337 | goto error; | |
1338 | } | |
1339 | ||
51755dc8 JG |
1340 | ust_exclusion = create_ust_exclusion_from_exclusion( |
1341 | ua_event->exclusion); | |
1342 | if (!ust_exclusion) { | |
1343 | ret = -LTTNG_ERR_NOMEM; | |
1344 | goto error; | |
1345 | } | |
fb45065e | 1346 | pthread_mutex_lock(&app->sock_lock); |
51755dc8 | 1347 | ret = ustctl_set_exclusion(app->sock, ust_exclusion, ua_event->obj); |
fb45065e | 1348 | pthread_mutex_unlock(&app->sock_lock); |
7cc9a73c JI |
1349 | if (ret < 0) { |
1350 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1351 | ERR("UST app event %s exclusions failed for app (pid: %d) " | |
1352 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1353 | } else { | |
1354 | /* | |
1355 | * This is normal behavior, an application can die during the | |
1356 | * creation process. Don't report an error so the execution can | |
1357 | * continue normally. | |
1358 | */ | |
1359 | ret = 0; | |
1360 | DBG3("UST app event exclusion failed. Application is dead."); | |
1361 | } | |
1362 | goto error; | |
1363 | } | |
1364 | ||
1365 | DBG2("UST exclusion set successfully for event %s", ua_event->name); | |
1366 | ||
1367 | error: | |
1368 | health_code_update(); | |
51755dc8 | 1369 | free(ust_exclusion); |
7cc9a73c JI |
1370 | return ret; |
1371 | } | |
1372 | ||
9730260e DG |
1373 | /* |
1374 | * Disable the specified event on to UST tracer for the UST session. | |
1375 | */ | |
1376 | static int disable_ust_event(struct ust_app *app, | |
1377 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1378 | { | |
1379 | int ret; | |
1380 | ||
840cb59c | 1381 | health_code_update(); |
86acf0da | 1382 | |
fb45065e | 1383 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1384 | ret = ustctl_disable(app->sock, ua_event->obj); |
fb45065e | 1385 | pthread_mutex_unlock(&app->sock_lock); |
9730260e | 1386 | if (ret < 0) { |
ffe60014 DG |
1387 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1388 | ERR("UST app event %s disable failed for app (pid: %d) " | |
1389 | "and session handle %d with ret %d", | |
1390 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1391 | } else { | |
3757b385 DG |
1392 | /* |
1393 | * This is normal behavior, an application can die during the | |
1394 | * creation process. Don't report an error so the execution can | |
1395 | * continue normally. | |
1396 | */ | |
1397 | ret = 0; | |
ffe60014 DG |
1398 | DBG3("UST app disable event failed. Application is dead."); |
1399 | } | |
9730260e DG |
1400 | goto error; |
1401 | } | |
1402 | ||
1403 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 1404 | ua_event->attr.name, app->pid); |
9730260e DG |
1405 | |
1406 | error: | |
840cb59c | 1407 | health_code_update(); |
9730260e DG |
1408 | return ret; |
1409 | } | |
1410 | ||
78f0bacd DG |
1411 | /* |
1412 | * Disable the specified channel on to UST tracer for the UST session. | |
1413 | */ | |
1414 | static int disable_ust_channel(struct ust_app *app, | |
1415 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1416 | { | |
1417 | int ret; | |
1418 | ||
840cb59c | 1419 | health_code_update(); |
86acf0da | 1420 | |
fb45065e | 1421 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1422 | ret = ustctl_disable(app->sock, ua_chan->obj); |
fb45065e | 1423 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1424 | if (ret < 0) { |
ffe60014 DG |
1425 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1426 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1427 | "and session handle %d with ret %d", | |
1428 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1429 | } else { | |
3757b385 DG |
1430 | /* |
1431 | * This is normal behavior, an application can die during the | |
1432 | * creation process. Don't report an error so the execution can | |
1433 | * continue normally. | |
1434 | */ | |
1435 | ret = 0; | |
ffe60014 DG |
1436 | DBG3("UST app disable channel failed. Application is dead."); |
1437 | } | |
78f0bacd DG |
1438 | goto error; |
1439 | } | |
1440 | ||
78f0bacd | 1441 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1442 | ua_chan->name, app->pid); |
78f0bacd DG |
1443 | |
1444 | error: | |
840cb59c | 1445 | health_code_update(); |
78f0bacd DG |
1446 | return ret; |
1447 | } | |
1448 | ||
1449 | /* | |
1450 | * Enable the specified channel on to UST tracer for the UST session. | |
1451 | */ | |
1452 | static int enable_ust_channel(struct ust_app *app, | |
1453 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1454 | { | |
1455 | int ret; | |
1456 | ||
840cb59c | 1457 | health_code_update(); |
86acf0da | 1458 | |
fb45065e | 1459 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1460 | ret = ustctl_enable(app->sock, ua_chan->obj); |
fb45065e | 1461 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1462 | if (ret < 0) { |
ffe60014 DG |
1463 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1464 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1465 | "and session handle %d with ret %d", | |
1466 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1467 | } else { | |
3757b385 DG |
1468 | /* |
1469 | * This is normal behavior, an application can die during the | |
1470 | * creation process. Don't report an error so the execution can | |
1471 | * continue normally. | |
1472 | */ | |
1473 | ret = 0; | |
ffe60014 DG |
1474 | DBG3("UST app enable channel failed. Application is dead."); |
1475 | } | |
78f0bacd DG |
1476 | goto error; |
1477 | } | |
1478 | ||
1479 | ua_chan->enabled = 1; | |
1480 | ||
1481 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1482 | ua_chan->name, app->pid); |
78f0bacd DG |
1483 | |
1484 | error: | |
840cb59c | 1485 | health_code_update(); |
78f0bacd DG |
1486 | return ret; |
1487 | } | |
1488 | ||
edb67388 DG |
1489 | /* |
1490 | * Enable the specified event on to UST tracer for the UST session. | |
1491 | */ | |
1492 | static int enable_ust_event(struct ust_app *app, | |
1493 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1494 | { | |
1495 | int ret; | |
1496 | ||
840cb59c | 1497 | health_code_update(); |
86acf0da | 1498 | |
fb45065e | 1499 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1500 | ret = ustctl_enable(app->sock, ua_event->obj); |
fb45065e | 1501 | pthread_mutex_unlock(&app->sock_lock); |
edb67388 | 1502 | if (ret < 0) { |
ffe60014 DG |
1503 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1504 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1505 | "and session handle %d with ret %d", | |
1506 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1507 | } else { | |
3757b385 DG |
1508 | /* |
1509 | * This is normal behavior, an application can die during the | |
1510 | * creation process. Don't report an error so the execution can | |
1511 | * continue normally. | |
1512 | */ | |
1513 | ret = 0; | |
ffe60014 DG |
1514 | DBG3("UST app enable event failed. Application is dead."); |
1515 | } | |
edb67388 DG |
1516 | goto error; |
1517 | } | |
1518 | ||
1519 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1520 | ua_event->attr.name, app->pid); |
edb67388 DG |
1521 | |
1522 | error: | |
840cb59c | 1523 | health_code_update(); |
edb67388 DG |
1524 | return ret; |
1525 | } | |
1526 | ||
099e26bd | 1527 | /* |
7972aab2 | 1528 | * Send channel and stream buffer to application. |
4f3ab6ee | 1529 | * |
ffe60014 | 1530 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1531 | */ |
7972aab2 DG |
1532 | static int send_channel_pid_to_ust(struct ust_app *app, |
1533 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1534 | { |
1535 | int ret; | |
ffe60014 | 1536 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1537 | |
1538 | assert(app); | |
ffe60014 | 1539 | assert(ua_sess); |
4f3ab6ee | 1540 | assert(ua_chan); |
4f3ab6ee | 1541 | |
840cb59c | 1542 | health_code_update(); |
4f3ab6ee | 1543 | |
7972aab2 DG |
1544 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1545 | app->sock); | |
86acf0da | 1546 | |
ffe60014 DG |
1547 | /* Send channel to the application. */ |
1548 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
1549 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1550 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1551 | goto error; | |
1552 | } else if (ret < 0) { | |
b551a063 DG |
1553 | goto error; |
1554 | } | |
1555 | ||
d88aee68 DG |
1556 | health_code_update(); |
1557 | ||
ffe60014 DG |
1558 | /* Send all streams to application. */ |
1559 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1560 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
a7169585 MD |
1561 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1562 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1563 | goto error; | |
1564 | } else if (ret < 0) { | |
ffe60014 DG |
1565 | goto error; |
1566 | } | |
1567 | /* We don't need the stream anymore once sent to the tracer. */ | |
1568 | cds_list_del(&stream->list); | |
fb45065e | 1569 | delete_ust_app_stream(-1, stream, app); |
ffe60014 | 1570 | } |
ffe60014 DG |
1571 | /* Flag the channel that it is sent to the application. */ |
1572 | ua_chan->is_sent = 1; | |
ffe60014 | 1573 | |
b551a063 | 1574 | error: |
840cb59c | 1575 | health_code_update(); |
b551a063 DG |
1576 | return ret; |
1577 | } | |
1578 | ||
91d76f53 | 1579 | /* |
5b4a0ec0 | 1580 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1581 | * |
1582 | * Should be called with session mutex held. | |
91d76f53 | 1583 | */ |
edb67388 DG |
1584 | static |
1585 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1586 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1587 | { |
5b4a0ec0 | 1588 | int ret = 0; |
284d8f55 | 1589 | |
840cb59c | 1590 | health_code_update(); |
86acf0da | 1591 | |
5b4a0ec0 | 1592 | /* Create UST event on tracer */ |
fb45065e | 1593 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1594 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 | 1595 | &ua_event->obj); |
fb45065e | 1596 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 | 1597 | if (ret < 0) { |
ffe60014 DG |
1598 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1599 | ERR("Error ustctl create event %s for app pid: %d with ret %d", | |
1600 | ua_event->attr.name, app->pid, ret); | |
1601 | } else { | |
3757b385 DG |
1602 | /* |
1603 | * This is normal behavior, an application can die during the | |
1604 | * creation process. Don't report an error so the execution can | |
1605 | * continue normally. | |
1606 | */ | |
1607 | ret = 0; | |
ffe60014 DG |
1608 | DBG3("UST app create event failed. Application is dead."); |
1609 | } | |
5b4a0ec0 | 1610 | goto error; |
91d76f53 | 1611 | } |
f6a9efaa | 1612 | |
5b4a0ec0 | 1613 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1614 | |
5b4a0ec0 | 1615 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1616 | ua_event->attr.name, app->pid); |
f6a9efaa | 1617 | |
840cb59c | 1618 | health_code_update(); |
86acf0da | 1619 | |
025faf73 DG |
1620 | /* Set filter if one is present. */ |
1621 | if (ua_event->filter) { | |
1622 | ret = set_ust_event_filter(ua_event, app); | |
1623 | if (ret < 0) { | |
1624 | goto error; | |
1625 | } | |
1626 | } | |
1627 | ||
7cc9a73c JI |
1628 | /* Set exclusions for the event */ |
1629 | if (ua_event->exclusion) { | |
1630 | ret = set_ust_event_exclusion(ua_event, app); | |
1631 | if (ret < 0) { | |
1632 | goto error; | |
1633 | } | |
1634 | } | |
1635 | ||
8535a6d9 | 1636 | /* If event not enabled, disable it on the tracer */ |
40113787 MD |
1637 | if (ua_event->enabled) { |
1638 | /* | |
1639 | * We now need to explicitly enable the event, since it | |
1640 | * is now disabled at creation. | |
1641 | */ | |
1642 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1643 | if (ret < 0) { | |
1644 | /* | |
1645 | * If we hit an EPERM, something is wrong with our enable call. If | |
1646 | * we get an EEXIST, there is a problem on the tracer side since we | |
1647 | * just created it. | |
1648 | */ | |
1649 | switch (ret) { | |
1650 | case -LTTNG_UST_ERR_PERM: | |
1651 | /* Code flow problem */ | |
1652 | assert(0); | |
1653 | case -LTTNG_UST_ERR_EXIST: | |
1654 | /* It's OK for our use case. */ | |
1655 | ret = 0; | |
1656 | break; | |
1657 | default: | |
1658 | break; | |
1659 | } | |
1660 | goto error; | |
1661 | } | |
8535a6d9 DG |
1662 | } |
1663 | ||
5b4a0ec0 | 1664 | error: |
840cb59c | 1665 | health_code_update(); |
5b4a0ec0 | 1666 | return ret; |
91d76f53 | 1667 | } |
48842b30 | 1668 | |
5b4a0ec0 DG |
1669 | /* |
1670 | * Copy data between an UST app event and a LTT event. | |
1671 | */ | |
421cb601 | 1672 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1673 | struct ltt_ust_event *uevent) |
1674 | { | |
b4ffad32 JI |
1675 | size_t exclusion_alloc_size; |
1676 | ||
48842b30 DG |
1677 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); |
1678 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1679 | ||
fc34caaa DG |
1680 | ua_event->enabled = uevent->enabled; |
1681 | ||
5b4a0ec0 DG |
1682 | /* Copy event attributes */ |
1683 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1684 | ||
53a80697 MD |
1685 | /* Copy filter bytecode */ |
1686 | if (uevent->filter) { | |
51755dc8 | 1687 | ua_event->filter = copy_filter_bytecode(uevent->filter); |
025faf73 | 1688 | /* Filter might be NULL here in case of ENONEM. */ |
53a80697 | 1689 | } |
b4ffad32 JI |
1690 | |
1691 | /* Copy exclusion data */ | |
1692 | if (uevent->exclusion) { | |
51755dc8 | 1693 | exclusion_alloc_size = sizeof(struct lttng_event_exclusion) + |
b4ffad32 JI |
1694 | LTTNG_UST_SYM_NAME_LEN * uevent->exclusion->count; |
1695 | ua_event->exclusion = zmalloc(exclusion_alloc_size); | |
5f8df26c JI |
1696 | if (ua_event->exclusion == NULL) { |
1697 | PERROR("malloc"); | |
1698 | } else { | |
1699 | memcpy(ua_event->exclusion, uevent->exclusion, | |
1700 | exclusion_alloc_size); | |
b4ffad32 JI |
1701 | } |
1702 | } | |
48842b30 DG |
1703 | } |
1704 | ||
5b4a0ec0 DG |
1705 | /* |
1706 | * Copy data between an UST app channel and a LTT channel. | |
1707 | */ | |
421cb601 | 1708 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1709 | struct ltt_ust_channel *uchan) |
1710 | { | |
bec39940 | 1711 | struct lttng_ht_iter iter; |
48842b30 | 1712 | struct ltt_ust_event *uevent; |
55cc08a6 | 1713 | struct ltt_ust_context *uctx; |
48842b30 DG |
1714 | struct ust_app_event *ua_event; |
1715 | ||
fc34caaa | 1716 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1717 | |
1718 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1719 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 1720 | |
1624d5b7 JD |
1721 | ua_chan->tracefile_size = uchan->tracefile_size; |
1722 | ua_chan->tracefile_count = uchan->tracefile_count; | |
1723 | ||
ffe60014 DG |
1724 | /* Copy event attributes since the layout is different. */ |
1725 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1726 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1727 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1728 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1729 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
1730 | ua_chan->attr.output = uchan->attr.output; | |
1731 | /* | |
1732 | * Note that the attribute channel type is not set since the channel on the | |
1733 | * tracing registry side does not have this information. | |
1734 | */ | |
48842b30 | 1735 | |
fc34caaa | 1736 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1737 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1738 | |
31746f93 | 1739 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { |
bdf64013 JG |
1740 | struct ust_app_ctx *ua_ctx = alloc_ust_app_ctx(&uctx->ctx); |
1741 | ||
55cc08a6 DG |
1742 | if (ua_ctx == NULL) { |
1743 | continue; | |
1744 | } | |
bec39940 DG |
1745 | lttng_ht_node_init_ulong(&ua_ctx->node, |
1746 | (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 1747 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 1748 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
55cc08a6 | 1749 | } |
48842b30 | 1750 | |
421cb601 | 1751 | /* Copy all events from ltt ust channel to ust app channel */ |
bec39940 | 1752 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
18eace3b | 1753 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 1754 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 1755 | if (ua_event == NULL) { |
421cb601 | 1756 | DBG2("UST event %s not found on shadow copy channel", |
48842b30 | 1757 | uevent->attr.name); |
284d8f55 | 1758 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
48842b30 | 1759 | if (ua_event == NULL) { |
5b4a0ec0 | 1760 | continue; |
48842b30 | 1761 | } |
421cb601 | 1762 | shadow_copy_event(ua_event, uevent); |
d0b96690 | 1763 | add_unique_ust_app_event(ua_chan, ua_event); |
48842b30 | 1764 | } |
48842b30 DG |
1765 | } |
1766 | ||
fc34caaa | 1767 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1768 | } |
1769 | ||
5b4a0ec0 DG |
1770 | /* |
1771 | * Copy data between a UST app session and a regular LTT session. | |
1772 | */ | |
421cb601 | 1773 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1774 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1775 | { |
bec39940 DG |
1776 | struct lttng_ht_node_str *ua_chan_node; |
1777 | struct lttng_ht_iter iter; | |
48842b30 DG |
1778 | struct ltt_ust_channel *uchan; |
1779 | struct ust_app_channel *ua_chan; | |
477d7741 MD |
1780 | time_t rawtime; |
1781 | struct tm *timeinfo; | |
1782 | char datetime[16]; | |
1783 | int ret; | |
d7ba1388 | 1784 | char tmp_shm_path[PATH_MAX]; |
477d7741 MD |
1785 | |
1786 | /* Get date and time for unique app path */ | |
1787 | time(&rawtime); | |
1788 | timeinfo = localtime(&rawtime); | |
1789 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1790 | |
421cb601 | 1791 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1792 | |
7972aab2 DG |
1793 | ua_sess->tracing_id = usess->id; |
1794 | ua_sess->id = get_next_session_id(); | |
1795 | ua_sess->uid = app->uid; | |
1796 | ua_sess->gid = app->gid; | |
1797 | ua_sess->euid = usess->uid; | |
1798 | ua_sess->egid = usess->gid; | |
1799 | ua_sess->buffer_type = usess->buffer_type; | |
1800 | ua_sess->bits_per_long = app->bits_per_long; | |
6addfa37 | 1801 | |
7972aab2 | 1802 | /* There is only one consumer object per session possible. */ |
6addfa37 | 1803 | consumer_output_get(usess->consumer); |
7972aab2 | 1804 | ua_sess->consumer = usess->consumer; |
6addfa37 | 1805 | |
2bba9e53 | 1806 | ua_sess->output_traces = usess->output_traces; |
ecc48a90 | 1807 | ua_sess->live_timer_interval = usess->live_timer_interval; |
84ad93e8 DG |
1808 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, |
1809 | &usess->metadata_attr); | |
7972aab2 DG |
1810 | |
1811 | switch (ua_sess->buffer_type) { | |
1812 | case LTTNG_BUFFER_PER_PID: | |
1813 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 1814 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
1815 | datetime); |
1816 | break; | |
1817 | case LTTNG_BUFFER_PER_UID: | |
1818 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1819 | DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long); | |
1820 | break; | |
1821 | default: | |
1822 | assert(0); | |
1823 | goto error; | |
1824 | } | |
477d7741 MD |
1825 | if (ret < 0) { |
1826 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1827 | assert(0); |
7972aab2 | 1828 | goto error; |
477d7741 MD |
1829 | } |
1830 | ||
3d071855 MD |
1831 | strncpy(ua_sess->root_shm_path, usess->root_shm_path, |
1832 | sizeof(ua_sess->root_shm_path)); | |
1833 | ua_sess->root_shm_path[sizeof(ua_sess->root_shm_path) - 1] = '\0'; | |
d7ba1388 MD |
1834 | strncpy(ua_sess->shm_path, usess->shm_path, |
1835 | sizeof(ua_sess->shm_path)); | |
1836 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
1837 | if (ua_sess->shm_path[0]) { | |
1838 | switch (ua_sess->buffer_type) { | |
1839 | case LTTNG_BUFFER_PER_PID: | |
1840 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
1841 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", | |
1842 | app->name, app->pid, datetime); | |
1843 | break; | |
1844 | case LTTNG_BUFFER_PER_UID: | |
1845 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
1846 | DEFAULT_UST_TRACE_UID_PATH, | |
1847 | app->uid, app->bits_per_long); | |
1848 | break; | |
1849 | default: | |
1850 | assert(0); | |
1851 | goto error; | |
1852 | } | |
1853 | if (ret < 0) { | |
1854 | PERROR("sprintf UST shadow copy session"); | |
1855 | assert(0); | |
1856 | goto error; | |
1857 | } | |
1858 | strncat(ua_sess->shm_path, tmp_shm_path, | |
1859 | sizeof(ua_sess->shm_path) - strlen(ua_sess->shm_path) - 1); | |
1860 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
1861 | } | |
1862 | ||
48842b30 | 1863 | /* Iterate over all channels in global domain. */ |
bec39940 DG |
1864 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, |
1865 | uchan, node.node) { | |
1866 | struct lttng_ht_iter uiter; | |
ba767faf | 1867 | |
bec39940 DG |
1868 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
1869 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
5b4a0ec0 | 1870 | if (ua_chan_node != NULL) { |
fc34caaa | 1871 | /* Session exist. Contiuing. */ |
5b4a0ec0 DG |
1872 | continue; |
1873 | } | |
421cb601 | 1874 | |
5b4a0ec0 DG |
1875 | DBG2("Channel %s not found on shadow session copy, creating it", |
1876 | uchan->name); | |
d0b96690 | 1877 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
5b4a0ec0 | 1878 | if (ua_chan == NULL) { |
fc34caaa | 1879 | /* malloc failed FIXME: Might want to do handle ENOMEM .. */ |
5b4a0ec0 | 1880 | continue; |
48842b30 | 1881 | } |
5b4a0ec0 | 1882 | shadow_copy_channel(ua_chan, uchan); |
ffe60014 DG |
1883 | /* |
1884 | * The concept of metadata channel does not exist on the tracing | |
1885 | * registry side of the session daemon so this can only be a per CPU | |
1886 | * channel and not metadata. | |
1887 | */ | |
1888 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
1889 | ||
bec39940 | 1890 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); |
48842b30 | 1891 | } |
6addfa37 | 1892 | return; |
7972aab2 DG |
1893 | |
1894 | error: | |
6addfa37 | 1895 | consumer_output_put(ua_sess->consumer); |
48842b30 DG |
1896 | } |
1897 | ||
78f0bacd DG |
1898 | /* |
1899 | * Lookup sesison wrapper. | |
1900 | */ | |
84cd17c6 MD |
1901 | static |
1902 | void __lookup_session_by_app(struct ltt_ust_session *usess, | |
bec39940 | 1903 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1904 | { |
1905 | /* Get right UST app session from app */ | |
d9bf3ca4 | 1906 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
1907 | } |
1908 | ||
421cb601 DG |
1909 | /* |
1910 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1911 | * id. |
421cb601 | 1912 | */ |
48842b30 DG |
1913 | static struct ust_app_session *lookup_session_by_app( |
1914 | struct ltt_ust_session *usess, struct ust_app *app) | |
1915 | { | |
bec39940 | 1916 | struct lttng_ht_iter iter; |
d9bf3ca4 | 1917 | struct lttng_ht_node_u64 *node; |
48842b30 | 1918 | |
84cd17c6 | 1919 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 1920 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
1921 | if (node == NULL) { |
1922 | goto error; | |
1923 | } | |
1924 | ||
1925 | return caa_container_of(node, struct ust_app_session, node); | |
1926 | ||
1927 | error: | |
1928 | return NULL; | |
1929 | } | |
1930 | ||
7972aab2 DG |
1931 | /* |
1932 | * Setup buffer registry per PID for the given session and application. If none | |
1933 | * is found, a new one is created, added to the global registry and | |
1934 | * initialized. If regp is valid, it's set with the newly created object. | |
1935 | * | |
1936 | * Return 0 on success or else a negative value. | |
1937 | */ | |
1938 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
1939 | struct ust_app *app, struct buffer_reg_pid **regp) | |
1940 | { | |
1941 | int ret = 0; | |
1942 | struct buffer_reg_pid *reg_pid; | |
1943 | ||
1944 | assert(ua_sess); | |
1945 | assert(app); | |
1946 | ||
1947 | rcu_read_lock(); | |
1948 | ||
1949 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
1950 | if (!reg_pid) { | |
1951 | /* | |
1952 | * This is the create channel path meaning that if there is NO | |
1953 | * registry available, we have to create one for this session. | |
1954 | */ | |
d7ba1388 | 1955 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid, |
3d071855 | 1956 | ua_sess->root_shm_path, ua_sess->shm_path); |
7972aab2 DG |
1957 | if (ret < 0) { |
1958 | goto error; | |
1959 | } | |
7972aab2 DG |
1960 | } else { |
1961 | goto end; | |
1962 | } | |
1963 | ||
1964 | /* Initialize registry. */ | |
1965 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
1966 | app->bits_per_long, app->uint8_t_alignment, | |
1967 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1968 | app->uint64_t_alignment, app->long_alignment, |
1969 | app->byte_order, app->version.major, | |
3d071855 MD |
1970 | app->version.minor, reg_pid->root_shm_path, |
1971 | reg_pid->shm_path, | |
d7ba1388 | 1972 | ua_sess->euid, ua_sess->egid); |
7972aab2 | 1973 | if (ret < 0) { |
286c991a MD |
1974 | /* |
1975 | * reg_pid->registry->reg.ust is NULL upon error, so we need to | |
1976 | * destroy the buffer registry, because it is always expected | |
1977 | * that if the buffer registry can be found, its ust registry is | |
1978 | * non-NULL. | |
1979 | */ | |
1980 | buffer_reg_pid_destroy(reg_pid); | |
7972aab2 DG |
1981 | goto error; |
1982 | } | |
1983 | ||
286c991a MD |
1984 | buffer_reg_pid_add(reg_pid); |
1985 | ||
7972aab2 DG |
1986 | DBG3("UST app buffer registry per PID created successfully"); |
1987 | ||
1988 | end: | |
1989 | if (regp) { | |
1990 | *regp = reg_pid; | |
1991 | } | |
1992 | error: | |
1993 | rcu_read_unlock(); | |
1994 | return ret; | |
1995 | } | |
1996 | ||
1997 | /* | |
1998 | * Setup buffer registry per UID for the given session and application. If none | |
1999 | * is found, a new one is created, added to the global registry and | |
2000 | * initialized. If regp is valid, it's set with the newly created object. | |
2001 | * | |
2002 | * Return 0 on success or else a negative value. | |
2003 | */ | |
2004 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
d7ba1388 | 2005 | struct ust_app_session *ua_sess, |
7972aab2 DG |
2006 | struct ust_app *app, struct buffer_reg_uid **regp) |
2007 | { | |
2008 | int ret = 0; | |
2009 | struct buffer_reg_uid *reg_uid; | |
2010 | ||
2011 | assert(usess); | |
2012 | assert(app); | |
2013 | ||
2014 | rcu_read_lock(); | |
2015 | ||
2016 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2017 | if (!reg_uid) { | |
2018 | /* | |
2019 | * This is the create channel path meaning that if there is NO | |
2020 | * registry available, we have to create one for this session. | |
2021 | */ | |
2022 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
3d071855 MD |
2023 | LTTNG_DOMAIN_UST, ®_uid, |
2024 | ua_sess->root_shm_path, ua_sess->shm_path); | |
7972aab2 DG |
2025 | if (ret < 0) { |
2026 | goto error; | |
2027 | } | |
7972aab2 DG |
2028 | } else { |
2029 | goto end; | |
2030 | } | |
2031 | ||
2032 | /* Initialize registry. */ | |
af6142cf | 2033 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
2034 | app->bits_per_long, app->uint8_t_alignment, |
2035 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
2036 | app->uint64_t_alignment, app->long_alignment, |
2037 | app->byte_order, app->version.major, | |
3d071855 MD |
2038 | app->version.minor, reg_uid->root_shm_path, |
2039 | reg_uid->shm_path, usess->uid, usess->gid); | |
7972aab2 | 2040 | if (ret < 0) { |
286c991a MD |
2041 | /* |
2042 | * reg_uid->registry->reg.ust is NULL upon error, so we need to | |
2043 | * destroy the buffer registry, because it is always expected | |
2044 | * that if the buffer registry can be found, its ust registry is | |
2045 | * non-NULL. | |
2046 | */ | |
2047 | buffer_reg_uid_destroy(reg_uid, NULL); | |
7972aab2 DG |
2048 | goto error; |
2049 | } | |
2050 | /* Add node to teardown list of the session. */ | |
2051 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
2052 | ||
286c991a | 2053 | buffer_reg_uid_add(reg_uid); |
7972aab2 | 2054 | |
286c991a | 2055 | DBG3("UST app buffer registry per UID created successfully"); |
7972aab2 DG |
2056 | end: |
2057 | if (regp) { | |
2058 | *regp = reg_uid; | |
2059 | } | |
2060 | error: | |
2061 | rcu_read_unlock(); | |
2062 | return ret; | |
2063 | } | |
2064 | ||
421cb601 | 2065 | /* |
3d8ca23b | 2066 | * Create a session on the tracer side for the given app. |
421cb601 | 2067 | * |
3d8ca23b DG |
2068 | * On success, ua_sess_ptr is populated with the session pointer or else left |
2069 | * untouched. If the session was created, is_created is set to 1. On error, | |
2070 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
2071 | * be NULL. | |
2072 | * | |
2073 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
2074 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 2075 | */ |
3d8ca23b DG |
2076 | static int create_ust_app_session(struct ltt_ust_session *usess, |
2077 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, | |
2078 | int *is_created) | |
421cb601 | 2079 | { |
3d8ca23b | 2080 | int ret, created = 0; |
421cb601 DG |
2081 | struct ust_app_session *ua_sess; |
2082 | ||
3d8ca23b DG |
2083 | assert(usess); |
2084 | assert(app); | |
2085 | assert(ua_sess_ptr); | |
2086 | ||
840cb59c | 2087 | health_code_update(); |
86acf0da | 2088 | |
421cb601 DG |
2089 | ua_sess = lookup_session_by_app(usess, app); |
2090 | if (ua_sess == NULL) { | |
d9bf3ca4 | 2091 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 2092 | app->pid, usess->id); |
d0b96690 | 2093 | ua_sess = alloc_ust_app_session(app); |
421cb601 DG |
2094 | if (ua_sess == NULL) { |
2095 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
2096 | ret = -ENOMEM; |
2097 | goto error; | |
421cb601 | 2098 | } |
477d7741 | 2099 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 2100 | created = 1; |
421cb601 DG |
2101 | } |
2102 | ||
7972aab2 DG |
2103 | switch (usess->buffer_type) { |
2104 | case LTTNG_BUFFER_PER_PID: | |
2105 | /* Init local registry. */ | |
2106 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 2107 | if (ret < 0) { |
e64207cf | 2108 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2109 | goto error; |
2110 | } | |
2111 | break; | |
2112 | case LTTNG_BUFFER_PER_UID: | |
2113 | /* Look for a global registry. If none exists, create one. */ | |
d7ba1388 | 2114 | ret = setup_buffer_reg_uid(usess, ua_sess, app, NULL); |
7972aab2 | 2115 | if (ret < 0) { |
e64207cf | 2116 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2117 | goto error; |
2118 | } | |
2119 | break; | |
2120 | default: | |
2121 | assert(0); | |
2122 | ret = -EINVAL; | |
2123 | goto error; | |
2124 | } | |
2125 | ||
2126 | health_code_update(); | |
2127 | ||
2128 | if (ua_sess->handle == -1) { | |
fb45065e | 2129 | pthread_mutex_lock(&app->sock_lock); |
7972aab2 | 2130 | ret = ustctl_create_session(app->sock); |
fb45065e | 2131 | pthread_mutex_unlock(&app->sock_lock); |
7972aab2 DG |
2132 | if (ret < 0) { |
2133 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
2134 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
2135 | app->pid, ret); |
2136 | } else { | |
2137 | DBG("UST app creating session failed. Application is dead"); | |
3757b385 DG |
2138 | /* |
2139 | * This is normal behavior, an application can die during the | |
2140 | * creation process. Don't report an error so the execution can | |
2141 | * continue normally. This will get flagged ENOTCONN and the | |
2142 | * caller will handle it. | |
2143 | */ | |
2144 | ret = 0; | |
ffe60014 | 2145 | } |
d0b96690 | 2146 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
2147 | if (ret != -ENOMEM) { |
2148 | /* | |
2149 | * Tracer is probably gone or got an internal error so let's | |
2150 | * behave like it will soon unregister or not usable. | |
2151 | */ | |
2152 | ret = -ENOTCONN; | |
2153 | } | |
2154 | goto error; | |
421cb601 DG |
2155 | } |
2156 | ||
7972aab2 DG |
2157 | ua_sess->handle = ret; |
2158 | ||
2159 | /* Add ust app session to app's HT */ | |
d9bf3ca4 MD |
2160 | lttng_ht_node_init_u64(&ua_sess->node, |
2161 | ua_sess->tracing_id); | |
2162 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
10b56aef MD |
2163 | lttng_ht_node_init_ulong(&ua_sess->ust_objd_node, ua_sess->handle); |
2164 | lttng_ht_add_unique_ulong(app->ust_sessions_objd, | |
2165 | &ua_sess->ust_objd_node); | |
7972aab2 DG |
2166 | |
2167 | DBG2("UST app session created successfully with handle %d", ret); | |
2168 | } | |
2169 | ||
2170 | *ua_sess_ptr = ua_sess; | |
2171 | if (is_created) { | |
2172 | *is_created = created; | |
2173 | } | |
2174 | ||
2175 | /* Everything went well. */ | |
2176 | ret = 0; | |
2177 | ||
2178 | error: | |
2179 | health_code_update(); | |
2180 | return ret; | |
2181 | } | |
2182 | ||
6a6b2068 JG |
2183 | /* |
2184 | * Match function for a hash table lookup of ust_app_ctx. | |
2185 | * | |
2186 | * It matches an ust app context based on the context type and, in the case | |
2187 | * of perf counters, their name. | |
2188 | */ | |
2189 | static int ht_match_ust_app_ctx(struct cds_lfht_node *node, const void *_key) | |
2190 | { | |
2191 | struct ust_app_ctx *ctx; | |
bdf64013 | 2192 | const struct lttng_ust_context_attr *key; |
6a6b2068 JG |
2193 | |
2194 | assert(node); | |
2195 | assert(_key); | |
2196 | ||
2197 | ctx = caa_container_of(node, struct ust_app_ctx, node.node); | |
2198 | key = _key; | |
2199 | ||
2200 | /* Context type */ | |
2201 | if (ctx->ctx.ctx != key->ctx) { | |
2202 | goto no_match; | |
2203 | } | |
2204 | ||
bdf64013 JG |
2205 | switch(key->ctx) { |
2206 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: | |
6a6b2068 | 2207 | if (strncmp(key->u.perf_counter.name, |
bdf64013 JG |
2208 | ctx->ctx.u.perf_counter.name, |
2209 | sizeof(key->u.perf_counter.name))) { | |
2210 | goto no_match; | |
2211 | } | |
2212 | break; | |
2213 | case LTTNG_UST_CONTEXT_APP_CONTEXT: | |
2214 | if (strcmp(key->u.app_ctx.provider_name, | |
2215 | ctx->ctx.u.app_ctx.provider_name) || | |
2216 | strcmp(key->u.app_ctx.ctx_name, | |
2217 | ctx->ctx.u.app_ctx.ctx_name)) { | |
6a6b2068 JG |
2218 | goto no_match; |
2219 | } | |
bdf64013 JG |
2220 | break; |
2221 | default: | |
2222 | break; | |
6a6b2068 JG |
2223 | } |
2224 | ||
2225 | /* Match. */ | |
2226 | return 1; | |
2227 | ||
2228 | no_match: | |
2229 | return 0; | |
2230 | } | |
2231 | ||
2232 | /* | |
2233 | * Lookup for an ust app context from an lttng_ust_context. | |
2234 | * | |
be184a0f | 2235 | * Must be called while holding RCU read side lock. |
6a6b2068 JG |
2236 | * Return an ust_app_ctx object or NULL on error. |
2237 | */ | |
2238 | static | |
2239 | struct ust_app_ctx *find_ust_app_context(struct lttng_ht *ht, | |
bdf64013 | 2240 | struct lttng_ust_context_attr *uctx) |
6a6b2068 JG |
2241 | { |
2242 | struct lttng_ht_iter iter; | |
2243 | struct lttng_ht_node_ulong *node; | |
2244 | struct ust_app_ctx *app_ctx = NULL; | |
2245 | ||
2246 | assert(uctx); | |
2247 | assert(ht); | |
2248 | ||
2249 | /* Lookup using the lttng_ust_context_type and a custom match fct. */ | |
2250 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) uctx->ctx, lttng_ht_seed), | |
2251 | ht_match_ust_app_ctx, uctx, &iter.iter); | |
2252 | node = lttng_ht_iter_get_node_ulong(&iter); | |
2253 | if (!node) { | |
2254 | goto end; | |
2255 | } | |
2256 | ||
2257 | app_ctx = caa_container_of(node, struct ust_app_ctx, node); | |
2258 | ||
2259 | end: | |
2260 | return app_ctx; | |
2261 | } | |
2262 | ||
7972aab2 DG |
2263 | /* |
2264 | * Create a context for the channel on the tracer. | |
2265 | * | |
2266 | * Called with UST app session lock held and a RCU read side lock. | |
2267 | */ | |
2268 | static | |
2269 | int create_ust_app_channel_context(struct ust_app_session *ua_sess, | |
bdf64013 JG |
2270 | struct ust_app_channel *ua_chan, |
2271 | struct lttng_ust_context_attr *uctx, | |
7972aab2 DG |
2272 | struct ust_app *app) |
2273 | { | |
2274 | int ret = 0; | |
7972aab2 DG |
2275 | struct ust_app_ctx *ua_ctx; |
2276 | ||
2277 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
2278 | ||
6a6b2068 JG |
2279 | ua_ctx = find_ust_app_context(ua_chan->ctx, uctx); |
2280 | if (ua_ctx) { | |
7972aab2 DG |
2281 | ret = -EEXIST; |
2282 | goto error; | |
2283 | } | |
2284 | ||
2285 | ua_ctx = alloc_ust_app_ctx(uctx); | |
2286 | if (ua_ctx == NULL) { | |
2287 | /* malloc failed */ | |
2288 | ret = -1; | |
2289 | goto error; | |
2290 | } | |
2291 | ||
2292 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 2293 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 2294 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
2295 | |
2296 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
2297 | if (ret < 0) { | |
2298 | goto error; | |
2299 | } | |
2300 | ||
2301 | error: | |
2302 | return ret; | |
2303 | } | |
2304 | ||
2305 | /* | |
2306 | * Enable on the tracer side a ust app event for the session and channel. | |
2307 | * | |
2308 | * Called with UST app session lock held. | |
2309 | */ | |
2310 | static | |
2311 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
2312 | struct ust_app_event *ua_event, struct ust_app *app) | |
2313 | { | |
2314 | int ret; | |
2315 | ||
2316 | ret = enable_ust_event(app, ua_sess, ua_event); | |
2317 | if (ret < 0) { | |
2318 | goto error; | |
2319 | } | |
2320 | ||
2321 | ua_event->enabled = 1; | |
2322 | ||
2323 | error: | |
2324 | return ret; | |
2325 | } | |
2326 | ||
2327 | /* | |
2328 | * Disable on the tracer side a ust app event for the session and channel. | |
2329 | */ | |
2330 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
2331 | struct ust_app_event *ua_event, struct ust_app *app) | |
2332 | { | |
2333 | int ret; | |
2334 | ||
2335 | ret = disable_ust_event(app, ua_sess, ua_event); | |
2336 | if (ret < 0) { | |
2337 | goto error; | |
2338 | } | |
2339 | ||
2340 | ua_event->enabled = 0; | |
2341 | ||
2342 | error: | |
2343 | return ret; | |
2344 | } | |
2345 | ||
2346 | /* | |
2347 | * Lookup ust app channel for session and disable it on the tracer side. | |
2348 | */ | |
2349 | static | |
2350 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
2351 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
2352 | { | |
2353 | int ret; | |
2354 | ||
2355 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2356 | if (ret < 0) { | |
2357 | goto error; | |
2358 | } | |
2359 | ||
2360 | ua_chan->enabled = 0; | |
2361 | ||
2362 | error: | |
2363 | return ret; | |
2364 | } | |
2365 | ||
2366 | /* | |
2367 | * Lookup ust app channel for session and enable it on the tracer side. This | |
2368 | * MUST be called with a RCU read side lock acquired. | |
2369 | */ | |
2370 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
2371 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
2372 | { | |
2373 | int ret = 0; | |
2374 | struct lttng_ht_iter iter; | |
2375 | struct lttng_ht_node_str *ua_chan_node; | |
2376 | struct ust_app_channel *ua_chan; | |
2377 | ||
2378 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
2379 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
2380 | if (ua_chan_node == NULL) { | |
d9bf3ca4 | 2381 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
2382 | uchan->name, ua_sess->tracing_id); |
2383 | goto error; | |
2384 | } | |
2385 | ||
2386 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2387 | ||
2388 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
2389 | if (ret < 0) { | |
2390 | goto error; | |
2391 | } | |
2392 | ||
2393 | error: | |
2394 | return ret; | |
2395 | } | |
2396 | ||
2397 | /* | |
2398 | * Ask the consumer to create a channel and get it if successful. | |
2399 | * | |
2400 | * Return 0 on success or else a negative value. | |
2401 | */ | |
2402 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
2403 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
2404 | int bitness, struct ust_registry_session *registry) | |
2405 | { | |
2406 | int ret; | |
2407 | unsigned int nb_fd = 0; | |
2408 | struct consumer_socket *socket; | |
2409 | ||
2410 | assert(usess); | |
2411 | assert(ua_sess); | |
2412 | assert(ua_chan); | |
2413 | assert(registry); | |
2414 | ||
2415 | rcu_read_lock(); | |
2416 | health_code_update(); | |
2417 | ||
2418 | /* Get the right consumer socket for the application. */ | |
2419 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
2420 | if (!socket) { | |
2421 | ret = -EINVAL; | |
2422 | goto error; | |
2423 | } | |
2424 | ||
2425 | health_code_update(); | |
2426 | ||
2427 | /* Need one fd for the channel. */ | |
2428 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2429 | if (ret < 0) { | |
2430 | ERR("Exhausted number of available FD upon create channel"); | |
2431 | goto error; | |
2432 | } | |
2433 | ||
2434 | /* | |
2435 | * Ask consumer to create channel. The consumer will return the number of | |
2436 | * stream we have to expect. | |
2437 | */ | |
2438 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
2439 | registry); | |
2440 | if (ret < 0) { | |
2441 | goto error_ask; | |
2442 | } | |
2443 | ||
2444 | /* | |
2445 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2446 | * stream (2 being the default value here). | |
2447 | */ | |
2448 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2449 | ||
2450 | /* Reserve the amount of file descriptor we need. */ | |
2451 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2452 | if (ret < 0) { | |
2453 | ERR("Exhausted number of available FD upon create channel"); | |
2454 | goto error_fd_get_stream; | |
2455 | } | |
2456 | ||
2457 | health_code_update(); | |
2458 | ||
2459 | /* | |
2460 | * Now get the channel from the consumer. This call wil populate the stream | |
2461 | * list of that channel and set the ust objects. | |
2462 | */ | |
d9078d0c DG |
2463 | if (usess->consumer->enabled) { |
2464 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2465 | if (ret < 0) { | |
2466 | goto error_destroy; | |
2467 | } | |
7972aab2 DG |
2468 | } |
2469 | ||
2470 | rcu_read_unlock(); | |
2471 | return 0; | |
2472 | ||
2473 | error_destroy: | |
2474 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2475 | error_fd_get_stream: | |
2476 | /* | |
2477 | * Initiate a destroy channel on the consumer since we had an error | |
2478 | * handling it on our side. The return value is of no importance since we | |
2479 | * already have a ret value set by the previous error that we need to | |
2480 | * return. | |
2481 | */ | |
2482 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2483 | error_ask: | |
2484 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2485 | error: | |
2486 | health_code_update(); | |
2487 | rcu_read_unlock(); | |
2488 | return ret; | |
2489 | } | |
2490 | ||
2491 | /* | |
2492 | * Duplicate the ust data object of the ust app stream and save it in the | |
2493 | * buffer registry stream. | |
2494 | * | |
2495 | * Return 0 on success or else a negative value. | |
2496 | */ | |
2497 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2498 | struct ust_app_stream *stream) | |
2499 | { | |
2500 | int ret; | |
2501 | ||
2502 | assert(reg_stream); | |
2503 | assert(stream); | |
2504 | ||
2505 | /* Reserve the amount of file descriptor we need. */ | |
2506 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2507 | if (ret < 0) { | |
2508 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2509 | goto error; | |
2510 | } | |
2511 | ||
2512 | /* Duplicate object for stream once the original is in the registry. */ | |
2513 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2514 | reg_stream->obj.ust); | |
2515 | if (ret < 0) { | |
2516 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2517 | reg_stream->obj.ust, stream->obj, ret); | |
2518 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2519 | goto error; | |
2520 | } | |
2521 | stream->handle = stream->obj->handle; | |
2522 | ||
2523 | error: | |
2524 | return ret; | |
2525 | } | |
2526 | ||
2527 | /* | |
2528 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2529 | * buffer registry channel. | |
2530 | * | |
2531 | * Return 0 on success or else a negative value. | |
2532 | */ | |
2533 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2534 | struct ust_app_channel *ua_chan) | |
2535 | { | |
2536 | int ret; | |
2537 | ||
2538 | assert(reg_chan); | |
2539 | assert(ua_chan); | |
2540 | ||
2541 | /* Need two fds for the channel. */ | |
2542 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2543 | if (ret < 0) { | |
2544 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2545 | goto error_fd_get; | |
2546 | } | |
2547 | ||
2548 | /* Duplicate object for stream once the original is in the registry. */ | |
2549 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2550 | if (ret < 0) { | |
2551 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2552 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2553 | goto error; | |
2554 | } | |
2555 | ua_chan->handle = ua_chan->obj->handle; | |
2556 | ||
2557 | return 0; | |
2558 | ||
2559 | error: | |
2560 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2561 | error_fd_get: | |
2562 | return ret; | |
2563 | } | |
2564 | ||
2565 | /* | |
2566 | * For a given channel buffer registry, setup all streams of the given ust | |
2567 | * application channel. | |
2568 | * | |
2569 | * Return 0 on success or else a negative value. | |
2570 | */ | |
2571 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
fb45065e MD |
2572 | struct ust_app_channel *ua_chan, |
2573 | struct ust_app *app) | |
7972aab2 DG |
2574 | { |
2575 | int ret = 0; | |
2576 | struct ust_app_stream *stream, *stmp; | |
2577 | ||
2578 | assert(reg_chan); | |
2579 | assert(ua_chan); | |
2580 | ||
2581 | DBG2("UST app setup buffer registry stream"); | |
2582 | ||
2583 | /* Send all streams to application. */ | |
2584 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2585 | struct buffer_reg_stream *reg_stream; | |
2586 | ||
2587 | ret = buffer_reg_stream_create(®_stream); | |
2588 | if (ret < 0) { | |
2589 | goto error; | |
2590 | } | |
2591 | ||
2592 | /* | |
2593 | * Keep original pointer and nullify it in the stream so the delete | |
2594 | * stream call does not release the object. | |
2595 | */ | |
2596 | reg_stream->obj.ust = stream->obj; | |
2597 | stream->obj = NULL; | |
2598 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2599 | |
7972aab2 DG |
2600 | /* We don't need the streams anymore. */ |
2601 | cds_list_del(&stream->list); | |
fb45065e | 2602 | delete_ust_app_stream(-1, stream, app); |
7972aab2 | 2603 | } |
421cb601 | 2604 | |
7972aab2 DG |
2605 | error: |
2606 | return ret; | |
2607 | } | |
2608 | ||
2609 | /* | |
2610 | * Create a buffer registry channel for the given session registry and | |
2611 | * application channel object. If regp pointer is valid, it's set with the | |
2612 | * created object. Important, the created object is NOT added to the session | |
2613 | * registry hash table. | |
2614 | * | |
2615 | * Return 0 on success else a negative value. | |
2616 | */ | |
2617 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2618 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2619 | { | |
2620 | int ret; | |
2621 | struct buffer_reg_channel *reg_chan = NULL; | |
2622 | ||
2623 | assert(reg_sess); | |
2624 | assert(ua_chan); | |
2625 | ||
2626 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2627 | ||
2628 | /* Create buffer registry channel. */ | |
2629 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2630 | if (ret < 0) { | |
2631 | goto error_create; | |
421cb601 | 2632 | } |
7972aab2 DG |
2633 | assert(reg_chan); |
2634 | reg_chan->consumer_key = ua_chan->key; | |
8c924c7b | 2635 | reg_chan->subbuf_size = ua_chan->attr.subbuf_size; |
d07ceecd | 2636 | reg_chan->num_subbuf = ua_chan->attr.num_subbuf; |
421cb601 | 2637 | |
7972aab2 DG |
2638 | /* Create and add a channel registry to session. */ |
2639 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2640 | ua_chan->tracing_channel_id); | |
2641 | if (ret < 0) { | |
2642 | goto error; | |
d88aee68 | 2643 | } |
7972aab2 | 2644 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2645 | |
7972aab2 DG |
2646 | if (regp) { |
2647 | *regp = reg_chan; | |
3d8ca23b | 2648 | } |
d88aee68 | 2649 | |
7972aab2 | 2650 | return 0; |
3d8ca23b DG |
2651 | |
2652 | error: | |
7972aab2 DG |
2653 | /* Safe because the registry channel object was not added to any HT. */ |
2654 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2655 | error_create: | |
3d8ca23b | 2656 | return ret; |
421cb601 DG |
2657 | } |
2658 | ||
55cc08a6 | 2659 | /* |
7972aab2 DG |
2660 | * Setup buffer registry channel for the given session registry and application |
2661 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2662 | * |
7972aab2 | 2663 | * Return 0 on success else a negative value. |
55cc08a6 | 2664 | */ |
7972aab2 | 2665 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
fb45065e MD |
2666 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan, |
2667 | struct ust_app *app) | |
55cc08a6 | 2668 | { |
7972aab2 | 2669 | int ret; |
55cc08a6 | 2670 | |
7972aab2 DG |
2671 | assert(reg_sess); |
2672 | assert(reg_chan); | |
2673 | assert(ua_chan); | |
2674 | assert(ua_chan->obj); | |
55cc08a6 | 2675 | |
7972aab2 | 2676 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2677 | |
7972aab2 | 2678 | /* Setup all streams for the registry. */ |
fb45065e | 2679 | ret = setup_buffer_reg_streams(reg_chan, ua_chan, app); |
7972aab2 | 2680 | if (ret < 0) { |
55cc08a6 DG |
2681 | goto error; |
2682 | } | |
2683 | ||
7972aab2 DG |
2684 | reg_chan->obj.ust = ua_chan->obj; |
2685 | ua_chan->obj = NULL; | |
55cc08a6 | 2686 | |
7972aab2 | 2687 | return 0; |
55cc08a6 DG |
2688 | |
2689 | error: | |
7972aab2 DG |
2690 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2691 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2692 | return ret; |
2693 | } | |
2694 | ||
edb67388 | 2695 | /* |
7972aab2 | 2696 | * Send buffer registry channel to the application. |
d0b96690 | 2697 | * |
7972aab2 | 2698 | * Return 0 on success else a negative value. |
edb67388 | 2699 | */ |
7972aab2 DG |
2700 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2701 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2702 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2703 | { |
2704 | int ret; | |
7972aab2 | 2705 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2706 | |
7972aab2 DG |
2707 | assert(reg_chan); |
2708 | assert(app); | |
2709 | assert(ua_sess); | |
2710 | assert(ua_chan); | |
2711 | ||
2712 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2713 | ||
2714 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2715 | if (ret < 0) { |
2716 | goto error; | |
2717 | } | |
2718 | ||
7972aab2 DG |
2719 | /* Send channel to the application. */ |
2720 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
2721 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
2722 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
2723 | goto error; | |
2724 | } else if (ret < 0) { | |
7972aab2 DG |
2725 | goto error; |
2726 | } | |
2727 | ||
2728 | health_code_update(); | |
2729 | ||
2730 | /* Send all streams to application. */ | |
2731 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2732 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2733 | struct ust_app_stream stream; | |
2734 | ||
2735 | ret = duplicate_stream_object(reg_stream, &stream); | |
2736 | if (ret < 0) { | |
2737 | goto error_stream_unlock; | |
2738 | } | |
2739 | ||
2740 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2741 | if (ret < 0) { | |
fb45065e | 2742 | (void) release_ust_app_stream(-1, &stream, app); |
a7169585 MD |
2743 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
2744 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
2745 | goto error_stream_unlock; | |
2746 | } else if (ret < 0) { | |
2747 | goto error_stream_unlock; | |
2748 | } | |
7972aab2 DG |
2749 | goto error_stream_unlock; |
2750 | } | |
edb67388 | 2751 | |
7972aab2 DG |
2752 | /* |
2753 | * The return value is not important here. This function will output an | |
2754 | * error if needed. | |
2755 | */ | |
fb45065e | 2756 | (void) release_ust_app_stream(-1, &stream, app); |
7972aab2 DG |
2757 | } |
2758 | ua_chan->is_sent = 1; | |
2759 | ||
2760 | error_stream_unlock: | |
2761 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2762 | error: |
2763 | return ret; | |
2764 | } | |
2765 | ||
9730260e | 2766 | /* |
7972aab2 DG |
2767 | * Create and send to the application the created buffers with per UID buffers. |
2768 | * | |
2769 | * Return 0 on success else a negative value. | |
9730260e | 2770 | */ |
7972aab2 DG |
2771 | static int create_channel_per_uid(struct ust_app *app, |
2772 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2773 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2774 | { |
2775 | int ret; | |
7972aab2 DG |
2776 | struct buffer_reg_uid *reg_uid; |
2777 | struct buffer_reg_channel *reg_chan; | |
9730260e | 2778 | |
7972aab2 DG |
2779 | assert(app); |
2780 | assert(usess); | |
2781 | assert(ua_sess); | |
2782 | assert(ua_chan); | |
2783 | ||
2784 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2785 | ||
2786 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2787 | /* | |
2788 | * The session creation handles the creation of this global registry | |
2789 | * object. If none can be find, there is a code flow problem or a | |
2790 | * teardown race. | |
2791 | */ | |
2792 | assert(reg_uid); | |
2793 | ||
2794 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2795 | reg_uid); | |
2796 | if (!reg_chan) { | |
2797 | /* Create the buffer registry channel object. */ | |
2798 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2799 | if (ret < 0) { | |
f14256d6 MD |
2800 | ERR("Error creating the UST channel \"%s\" registry instance", |
2801 | ua_chan->name); | |
7972aab2 DG |
2802 | goto error; |
2803 | } | |
2804 | assert(reg_chan); | |
2805 | ||
2806 | /* | |
2807 | * Create the buffers on the consumer side. This call populates the | |
2808 | * ust app channel object with all streams and data object. | |
2809 | */ | |
2810 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2811 | app->bits_per_long, reg_uid->registry->reg.ust); | |
2812 | if (ret < 0) { | |
f14256d6 MD |
2813 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
2814 | ua_chan->name); | |
2815 | ||
07d2ae95 DG |
2816 | /* |
2817 | * Let's remove the previously created buffer registry channel so | |
2818 | * it's not visible anymore in the session registry. | |
2819 | */ | |
2820 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, | |
2821 | ua_chan->tracing_channel_id); | |
2822 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
2823 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
7972aab2 DG |
2824 | goto error; |
2825 | } | |
2826 | ||
2827 | /* | |
2828 | * Setup the streams and add it to the session registry. | |
2829 | */ | |
fb45065e MD |
2830 | ret = setup_buffer_reg_channel(reg_uid->registry, |
2831 | ua_chan, reg_chan, app); | |
7972aab2 | 2832 | if (ret < 0) { |
f14256d6 MD |
2833 | ERR("Error setting up UST channel \"%s\"", |
2834 | ua_chan->name); | |
7972aab2 DG |
2835 | goto error; |
2836 | } | |
2837 | ||
2838 | } | |
2839 | ||
2840 | /* Send buffers to the application. */ | |
2841 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
9730260e | 2842 | if (ret < 0) { |
a7169585 MD |
2843 | if (ret != -ENOTCONN) { |
2844 | ERR("Error sending channel to application"); | |
2845 | } | |
9730260e DG |
2846 | goto error; |
2847 | } | |
2848 | ||
9730260e DG |
2849 | error: |
2850 | return ret; | |
2851 | } | |
2852 | ||
78f0bacd | 2853 | /* |
7972aab2 DG |
2854 | * Create and send to the application the created buffers with per PID buffers. |
2855 | * | |
2856 | * Return 0 on success else a negative value. | |
78f0bacd | 2857 | */ |
7972aab2 DG |
2858 | static int create_channel_per_pid(struct ust_app *app, |
2859 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2860 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2861 | { |
8535a6d9 | 2862 | int ret; |
7972aab2 | 2863 | struct ust_registry_session *registry; |
78f0bacd | 2864 | |
7972aab2 DG |
2865 | assert(app); |
2866 | assert(usess); | |
2867 | assert(ua_sess); | |
2868 | assert(ua_chan); | |
2869 | ||
2870 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2871 | ||
2872 | rcu_read_lock(); | |
2873 | ||
2874 | registry = get_session_registry(ua_sess); | |
2875 | assert(registry); | |
2876 | ||
2877 | /* Create and add a new channel registry to session. */ | |
2878 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd | 2879 | if (ret < 0) { |
f14256d6 MD |
2880 | ERR("Error creating the UST channel \"%s\" registry instance", |
2881 | ua_chan->name); | |
78f0bacd DG |
2882 | goto error; |
2883 | } | |
2884 | ||
7972aab2 DG |
2885 | /* Create and get channel on the consumer side. */ |
2886 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2887 | app->bits_per_long, registry); | |
2888 | if (ret < 0) { | |
f14256d6 MD |
2889 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
2890 | ua_chan->name); | |
7972aab2 DG |
2891 | goto error; |
2892 | } | |
2893 | ||
2894 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
2895 | if (ret < 0) { | |
a7169585 MD |
2896 | if (ret != -ENOTCONN) { |
2897 | ERR("Error sending channel to application"); | |
2898 | } | |
7972aab2 DG |
2899 | goto error; |
2900 | } | |
8535a6d9 | 2901 | |
78f0bacd | 2902 | error: |
7972aab2 | 2903 | rcu_read_unlock(); |
78f0bacd DG |
2904 | return ret; |
2905 | } | |
2906 | ||
2907 | /* | |
7972aab2 DG |
2908 | * From an already allocated ust app channel, create the channel buffers if |
2909 | * need and send it to the application. This MUST be called with a RCU read | |
2910 | * side lock acquired. | |
2911 | * | |
a7169585 MD |
2912 | * Return 0 on success or else a negative value. Returns -ENOTCONN if |
2913 | * the application exited concurrently. | |
78f0bacd | 2914 | */ |
7972aab2 DG |
2915 | static int do_create_channel(struct ust_app *app, |
2916 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2917 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2918 | { |
7972aab2 | 2919 | int ret; |
78f0bacd | 2920 | |
7972aab2 DG |
2921 | assert(app); |
2922 | assert(usess); | |
2923 | assert(ua_sess); | |
2924 | assert(ua_chan); | |
2925 | ||
2926 | /* Handle buffer type before sending the channel to the application. */ | |
2927 | switch (usess->buffer_type) { | |
2928 | case LTTNG_BUFFER_PER_UID: | |
2929 | { | |
2930 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
2931 | if (ret < 0) { | |
2932 | goto error; | |
2933 | } | |
2934 | break; | |
2935 | } | |
2936 | case LTTNG_BUFFER_PER_PID: | |
2937 | { | |
2938 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
2939 | if (ret < 0) { | |
2940 | goto error; | |
2941 | } | |
2942 | break; | |
2943 | } | |
2944 | default: | |
2945 | assert(0); | |
2946 | ret = -EINVAL; | |
78f0bacd DG |
2947 | goto error; |
2948 | } | |
2949 | ||
7972aab2 DG |
2950 | /* Initialize ust objd object using the received handle and add it. */ |
2951 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
2952 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 2953 | |
7972aab2 DG |
2954 | /* If channel is not enabled, disable it on the tracer */ |
2955 | if (!ua_chan->enabled) { | |
2956 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2957 | if (ret < 0) { | |
2958 | goto error; | |
2959 | } | |
78f0bacd DG |
2960 | } |
2961 | ||
2962 | error: | |
2963 | return ret; | |
2964 | } | |
2965 | ||
284d8f55 | 2966 | /* |
4d710ac2 DG |
2967 | * Create UST app channel and create it on the tracer. Set ua_chanp of the |
2968 | * newly created channel if not NULL. | |
d0b96690 | 2969 | * |
36b588ed | 2970 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 | 2971 | * |
a7169585 MD |
2972 | * Return 0 on success or else a negative value. Returns -ENOTCONN if |
2973 | * the application exited concurrently. | |
284d8f55 | 2974 | */ |
4d710ac2 DG |
2975 | static int create_ust_app_channel(struct ust_app_session *ua_sess, |
2976 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
7972aab2 | 2977 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 2978 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
2979 | { |
2980 | int ret = 0; | |
bec39940 DG |
2981 | struct lttng_ht_iter iter; |
2982 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
2983 | struct ust_app_channel *ua_chan; |
2984 | ||
2985 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
2986 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
2987 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 2988 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 2989 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 2990 | goto end; |
5b4a0ec0 DG |
2991 | } |
2992 | ||
d0b96690 | 2993 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
2994 | if (ua_chan == NULL) { |
2995 | /* Only malloc can fail here */ | |
4d710ac2 | 2996 | ret = -ENOMEM; |
094d1690 | 2997 | goto error_alloc; |
fc34caaa DG |
2998 | } |
2999 | shadow_copy_channel(ua_chan, uchan); | |
3000 | ||
ffe60014 DG |
3001 | /* Set channel type. */ |
3002 | ua_chan->attr.type = type; | |
3003 | ||
7972aab2 | 3004 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
5b4a0ec0 DG |
3005 | if (ret < 0) { |
3006 | goto error; | |
3007 | } | |
3008 | ||
fc34caaa | 3009 | DBG2("UST app create channel %s for PID %d completed", ua_chan->name, |
852d0037 | 3010 | app->pid); |
fc34caaa | 3011 | |
d0b96690 DG |
3012 | /* Only add the channel if successful on the tracer side. */ |
3013 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
3014 | ||
fc34caaa | 3015 | end: |
4d710ac2 DG |
3016 | if (ua_chanp) { |
3017 | *ua_chanp = ua_chan; | |
3018 | } | |
3019 | ||
3020 | /* Everything went well. */ | |
3021 | return 0; | |
5b4a0ec0 DG |
3022 | |
3023 | error: | |
d0b96690 | 3024 | delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app); |
094d1690 | 3025 | error_alloc: |
4d710ac2 | 3026 | return ret; |
5b4a0ec0 DG |
3027 | } |
3028 | ||
3029 | /* | |
3030 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
3031 | * |
3032 | * Called with ust app session mutex held. | |
5b4a0ec0 | 3033 | */ |
edb67388 DG |
3034 | static |
3035 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
3036 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
3037 | struct ust_app *app) | |
284d8f55 | 3038 | { |
edb67388 | 3039 | int ret = 0; |
5b4a0ec0 | 3040 | struct ust_app_event *ua_event; |
284d8f55 | 3041 | |
5b4a0ec0 | 3042 | /* Get event node */ |
18eace3b | 3043 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 3044 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 3045 | if (ua_event != NULL) { |
fc34caaa | 3046 | ret = -EEXIST; |
edb67388 DG |
3047 | goto end; |
3048 | } | |
5b4a0ec0 | 3049 | |
edb67388 DG |
3050 | /* Does not exist so create one */ |
3051 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); | |
3052 | if (ua_event == NULL) { | |
3053 | /* Only malloc can failed so something is really wrong */ | |
3054 | ret = -ENOMEM; | |
fc34caaa | 3055 | goto end; |
5b4a0ec0 | 3056 | } |
edb67388 | 3057 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 3058 | |
edb67388 | 3059 | /* Create it on the tracer side */ |
5b4a0ec0 | 3060 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 3061 | if (ret < 0) { |
fc34caaa | 3062 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 3063 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
3064 | goto error; |
3065 | } | |
3066 | ||
d0b96690 | 3067 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 3068 | |
fc34caaa | 3069 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 3070 | app->pid); |
7f79d3a1 | 3071 | |
edb67388 | 3072 | end: |
fc34caaa DG |
3073 | return ret; |
3074 | ||
5b4a0ec0 | 3075 | error: |
fc34caaa | 3076 | /* Valid. Calling here is already in a read side lock */ |
fb45065e | 3077 | delete_ust_app_event(-1, ua_event, app); |
edb67388 | 3078 | return ret; |
5b4a0ec0 DG |
3079 | } |
3080 | ||
3081 | /* | |
3082 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 3083 | * |
7972aab2 | 3084 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
3085 | */ |
3086 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
ad7a9107 | 3087 | struct ust_app *app, struct consumer_output *consumer) |
5b4a0ec0 DG |
3088 | { |
3089 | int ret = 0; | |
ffe60014 | 3090 | struct ust_app_channel *metadata; |
d88aee68 | 3091 | struct consumer_socket *socket; |
7972aab2 | 3092 | struct ust_registry_session *registry; |
5b4a0ec0 | 3093 | |
ffe60014 DG |
3094 | assert(ua_sess); |
3095 | assert(app); | |
d88aee68 | 3096 | assert(consumer); |
5b4a0ec0 | 3097 | |
7972aab2 DG |
3098 | registry = get_session_registry(ua_sess); |
3099 | assert(registry); | |
3100 | ||
ce34fcd0 MD |
3101 | pthread_mutex_lock(®istry->lock); |
3102 | ||
1b532a60 DG |
3103 | /* Metadata already exists for this registry or it was closed previously */ |
3104 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
3105 | ret = 0; |
3106 | goto error; | |
5b4a0ec0 DG |
3107 | } |
3108 | ||
ffe60014 | 3109 | /* Allocate UST metadata */ |
d0b96690 | 3110 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
3111 | if (!metadata) { |
3112 | /* malloc() failed */ | |
3113 | ret = -ENOMEM; | |
3114 | goto error; | |
3115 | } | |
5b4a0ec0 | 3116 | |
ad7a9107 | 3117 | memcpy(&metadata->attr, &ua_sess->metadata_attr, sizeof(metadata->attr)); |
5b4a0ec0 | 3118 | |
7972aab2 DG |
3119 | /* Need one fd for the channel. */ |
3120 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
3121 | if (ret < 0) { | |
3122 | ERR("Exhausted number of available FD upon create metadata"); | |
3123 | goto error; | |
3124 | } | |
3125 | ||
4dc3dfc5 DG |
3126 | /* Get the right consumer socket for the application. */ |
3127 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
3128 | if (!socket) { | |
3129 | ret = -EINVAL; | |
3130 | goto error_consumer; | |
3131 | } | |
3132 | ||
331744e3 JD |
3133 | /* |
3134 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
3135 | * to the registry *before* we ask the consumer so we avoid the race of the | |
3136 | * consumer requesting the metadata and the ask_channel call on our side | |
3137 | * did not returned yet. | |
3138 | */ | |
3139 | registry->metadata_key = metadata->key; | |
3140 | ||
d88aee68 DG |
3141 | /* |
3142 | * Ask the metadata channel creation to the consumer. The metadata object | |
3143 | * will be created by the consumer and kept their. However, the stream is | |
3144 | * never added or monitored until we do a first push metadata to the | |
3145 | * consumer. | |
3146 | */ | |
7972aab2 DG |
3147 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
3148 | registry); | |
d88aee68 | 3149 | if (ret < 0) { |
f2a444f1 DG |
3150 | /* Nullify the metadata key so we don't try to close it later on. */ |
3151 | registry->metadata_key = 0; | |
d88aee68 DG |
3152 | goto error_consumer; |
3153 | } | |
3154 | ||
3155 | /* | |
3156 | * The setup command will make the metadata stream be sent to the relayd, | |
3157 | * if applicable, and the thread managing the metadatas. This is important | |
3158 | * because after this point, if an error occurs, the only way the stream | |
3159 | * can be deleted is to be monitored in the consumer. | |
3160 | */ | |
7972aab2 | 3161 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 3162 | if (ret < 0) { |
f2a444f1 DG |
3163 | /* Nullify the metadata key so we don't try to close it later on. */ |
3164 | registry->metadata_key = 0; | |
d88aee68 | 3165 | goto error_consumer; |
5b4a0ec0 DG |
3166 | } |
3167 | ||
7972aab2 DG |
3168 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
3169 | metadata->key, app->pid); | |
5b4a0ec0 | 3170 | |
d88aee68 | 3171 | error_consumer: |
b80f0b6c | 3172 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 3173 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 3174 | error: |
ce34fcd0 | 3175 | pthread_mutex_unlock(®istry->lock); |
ffe60014 | 3176 | return ret; |
5b4a0ec0 DG |
3177 | } |
3178 | ||
5b4a0ec0 | 3179 | /* |
d88aee68 DG |
3180 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
3181 | * acquired before calling this function. | |
5b4a0ec0 DG |
3182 | */ |
3183 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
3184 | { | |
d88aee68 | 3185 | struct ust_app *app = NULL; |
bec39940 DG |
3186 | struct lttng_ht_node_ulong *node; |
3187 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 3188 | |
bec39940 DG |
3189 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
3190 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
3191 | if (node == NULL) { |
3192 | DBG2("UST app no found with pid %d", pid); | |
3193 | goto error; | |
3194 | } | |
5b4a0ec0 DG |
3195 | |
3196 | DBG2("Found UST app by pid %d", pid); | |
3197 | ||
d88aee68 | 3198 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
3199 | |
3200 | error: | |
d88aee68 | 3201 | return app; |
5b4a0ec0 DG |
3202 | } |
3203 | ||
d88aee68 DG |
3204 | /* |
3205 | * Allocate and init an UST app object using the registration information and | |
3206 | * the command socket. This is called when the command socket connects to the | |
3207 | * session daemon. | |
3208 | * | |
3209 | * The object is returned on success or else NULL. | |
3210 | */ | |
d0b96690 | 3211 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 3212 | { |
d0b96690 DG |
3213 | struct ust_app *lta = NULL; |
3214 | ||
3215 | assert(msg); | |
3216 | assert(sock >= 0); | |
3217 | ||
3218 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 3219 | |
173af62f DG |
3220 | if ((msg->bits_per_long == 64 && |
3221 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
3222 | || (msg->bits_per_long == 32 && | |
3223 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 3224 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
3225 | "%d-bit long, but no consumerd for this size is available.\n", |
3226 | msg->name, msg->pid, msg->bits_per_long); | |
3227 | goto error; | |
3f2c5fcc | 3228 | } |
d0b96690 | 3229 | |
5b4a0ec0 DG |
3230 | lta = zmalloc(sizeof(struct ust_app)); |
3231 | if (lta == NULL) { | |
3232 | PERROR("malloc"); | |
d0b96690 | 3233 | goto error; |
5b4a0ec0 DG |
3234 | } |
3235 | ||
3236 | lta->ppid = msg->ppid; | |
3237 | lta->uid = msg->uid; | |
3238 | lta->gid = msg->gid; | |
d0b96690 | 3239 | |
7753dea8 | 3240 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
3241 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
3242 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
3243 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
3244 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
3245 | lta->long_alignment = msg->long_alignment; | |
3246 | lta->byte_order = msg->byte_order; | |
3247 | ||
5b4a0ec0 DG |
3248 | lta->v_major = msg->major; |
3249 | lta->v_minor = msg->minor; | |
d9bf3ca4 | 3250 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 | 3251 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
10b56aef | 3252 | lta->ust_sessions_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3253 | lta->notify_sock = -1; |
d88aee68 DG |
3254 | |
3255 | /* Copy name and make sure it's NULL terminated. */ | |
3256 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
3257 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
3258 | ||
3259 | /* | |
3260 | * Before this can be called, when receiving the registration information, | |
3261 | * the application compatibility is checked. So, at this point, the | |
3262 | * application can work with this session daemon. | |
3263 | */ | |
d0b96690 | 3264 | lta->compatible = 1; |
5b4a0ec0 | 3265 | |
852d0037 | 3266 | lta->pid = msg->pid; |
d0b96690 | 3267 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 3268 | lta->sock = sock; |
fb45065e | 3269 | pthread_mutex_init(<a->sock_lock, NULL); |
d0b96690 | 3270 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 3271 | |
d42f20df | 3272 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
d0b96690 DG |
3273 | error: |
3274 | return lta; | |
3275 | } | |
3276 | ||
d88aee68 DG |
3277 | /* |
3278 | * For a given application object, add it to every hash table. | |
3279 | */ | |
d0b96690 DG |
3280 | void ust_app_add(struct ust_app *app) |
3281 | { | |
3282 | assert(app); | |
3283 | assert(app->notify_sock >= 0); | |
3284 | ||
5b4a0ec0 | 3285 | rcu_read_lock(); |
852d0037 DG |
3286 | |
3287 | /* | |
3288 | * On a re-registration, we want to kick out the previous registration of | |
3289 | * that pid | |
3290 | */ | |
d0b96690 | 3291 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
3292 | |
3293 | /* | |
3294 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
3295 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
3296 | * already in the table. | |
3297 | */ | |
d0b96690 | 3298 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 3299 | |
d0b96690 DG |
3300 | /* Add application to the notify socket hash table. */ |
3301 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
3302 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 3303 | |
d0b96690 | 3304 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
3305 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
3306 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
3307 | app->v_minor); | |
5b4a0ec0 | 3308 | |
d0b96690 DG |
3309 | rcu_read_unlock(); |
3310 | } | |
3311 | ||
d88aee68 DG |
3312 | /* |
3313 | * Set the application version into the object. | |
3314 | * | |
3315 | * Return 0 on success else a negative value either an errno code or a | |
3316 | * LTTng-UST error code. | |
3317 | */ | |
d0b96690 DG |
3318 | int ust_app_version(struct ust_app *app) |
3319 | { | |
d88aee68 DG |
3320 | int ret; |
3321 | ||
d0b96690 | 3322 | assert(app); |
d88aee68 | 3323 | |
fb45065e | 3324 | pthread_mutex_lock(&app->sock_lock); |
d88aee68 | 3325 | ret = ustctl_tracer_version(app->sock, &app->version); |
fb45065e | 3326 | pthread_mutex_unlock(&app->sock_lock); |
d88aee68 DG |
3327 | if (ret < 0) { |
3328 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
5368d366 | 3329 | ERR("UST app %d version failed with ret %d", app->sock, ret); |
d88aee68 | 3330 | } else { |
5368d366 | 3331 | DBG3("UST app %d version failed. Application is dead", app->sock); |
d88aee68 DG |
3332 | } |
3333 | } | |
3334 | ||
3335 | return ret; | |
5b4a0ec0 DG |
3336 | } |
3337 | ||
3338 | /* | |
3339 | * Unregister app by removing it from the global traceable app list and freeing | |
3340 | * the data struct. | |
3341 | * | |
3342 | * The socket is already closed at this point so no close to sock. | |
3343 | */ | |
3344 | void ust_app_unregister(int sock) | |
3345 | { | |
3346 | struct ust_app *lta; | |
bec39940 | 3347 | struct lttng_ht_node_ulong *node; |
c4b88406 | 3348 | struct lttng_ht_iter ust_app_sock_iter; |
bec39940 | 3349 | struct lttng_ht_iter iter; |
d42f20df | 3350 | struct ust_app_session *ua_sess; |
525b0740 | 3351 | int ret; |
5b4a0ec0 DG |
3352 | |
3353 | rcu_read_lock(); | |
886459c6 | 3354 | |
5b4a0ec0 | 3355 | /* Get the node reference for a call_rcu */ |
c4b88406 MD |
3356 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &ust_app_sock_iter); |
3357 | node = lttng_ht_iter_get_node_ulong(&ust_app_sock_iter); | |
d0b96690 | 3358 | assert(node); |
284d8f55 | 3359 | |
852d0037 | 3360 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
3361 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
3362 | ||
d88aee68 | 3363 | /* |
ce34fcd0 MD |
3364 | * For per-PID buffers, perform "push metadata" and flush all |
3365 | * application streams before removing app from hash tables, | |
3366 | * ensuring proper behavior of data_pending check. | |
c4b88406 | 3367 | * Remove sessions so they are not visible during deletion. |
d88aee68 | 3368 | */ |
d42f20df DG |
3369 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, |
3370 | node.node) { | |
7972aab2 DG |
3371 | struct ust_registry_session *registry; |
3372 | ||
d42f20df DG |
3373 | ret = lttng_ht_del(lta->sessions, &iter); |
3374 | if (ret) { | |
3375 | /* The session was already removed so scheduled for teardown. */ | |
3376 | continue; | |
3377 | } | |
3378 | ||
ce34fcd0 MD |
3379 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { |
3380 | (void) ust_app_flush_app_session(lta, ua_sess); | |
3381 | } | |
c4b88406 | 3382 | |
d42f20df DG |
3383 | /* |
3384 | * Add session to list for teardown. This is safe since at this point we | |
3385 | * are the only one using this list. | |
3386 | */ | |
d88aee68 DG |
3387 | pthread_mutex_lock(&ua_sess->lock); |
3388 | ||
b161602a MD |
3389 | if (ua_sess->deleted) { |
3390 | pthread_mutex_unlock(&ua_sess->lock); | |
3391 | continue; | |
3392 | } | |
3393 | ||
d88aee68 DG |
3394 | /* |
3395 | * Normally, this is done in the delete session process which is | |
3396 | * executed in the call rcu below. However, upon registration we can't | |
3397 | * afford to wait for the grace period before pushing data or else the | |
3398 | * data pending feature can race between the unregistration and stop | |
3399 | * command where the data pending command is sent *before* the grace | |
3400 | * period ended. | |
3401 | * | |
3402 | * The close metadata below nullifies the metadata pointer in the | |
3403 | * session so the delete session will NOT push/close a second time. | |
3404 | */ | |
7972aab2 | 3405 | registry = get_session_registry(ua_sess); |
ce34fcd0 | 3406 | if (registry) { |
7972aab2 DG |
3407 | /* Push metadata for application before freeing the application. */ |
3408 | (void) push_metadata(registry, ua_sess->consumer); | |
3409 | ||
3410 | /* | |
3411 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
3412 | * metadata only on destroy trace session in this case. Also, the |
3413 | * previous push metadata could have flag the metadata registry to | |
3414 | * close so don't send a close command if closed. | |
7972aab2 | 3415 | */ |
ce34fcd0 | 3416 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
3417 | /* And ask to close it for this session registry. */ |
3418 | (void) close_metadata(registry, ua_sess->consumer); | |
3419 | } | |
3420 | } | |
d42f20df | 3421 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
c4b88406 | 3422 | |
d88aee68 | 3423 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
3424 | } |
3425 | ||
c4b88406 MD |
3426 | /* Remove application from PID hash table */ |
3427 | ret = lttng_ht_del(ust_app_ht_by_sock, &ust_app_sock_iter); | |
3428 | assert(!ret); | |
3429 | ||
3430 | /* | |
3431 | * Remove application from notify hash table. The thread handling the | |
3432 | * notify socket could have deleted the node so ignore on error because | |
3433 | * either way it's valid. The close of that socket is handled by the other | |
3434 | * thread. | |
3435 | */ | |
3436 | iter.iter.node = <a->notify_sock_n.node; | |
3437 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3438 | ||
3439 | /* | |
3440 | * Ignore return value since the node might have been removed before by an | |
3441 | * add replace during app registration because the PID can be reassigned by | |
3442 | * the OS. | |
3443 | */ | |
3444 | iter.iter.node = <a->pid_n.node; | |
3445 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3446 | if (ret) { | |
3447 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
3448 | lta->pid); | |
3449 | } | |
3450 | ||
852d0037 DG |
3451 | /* Free memory */ |
3452 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
3453 | ||
5b4a0ec0 DG |
3454 | rcu_read_unlock(); |
3455 | return; | |
284d8f55 DG |
3456 | } |
3457 | ||
5b4a0ec0 DG |
3458 | /* |
3459 | * Fill events array with all events name of all registered apps. | |
3460 | */ | |
3461 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 3462 | { |
5b4a0ec0 DG |
3463 | int ret, handle; |
3464 | size_t nbmem, count = 0; | |
bec39940 | 3465 | struct lttng_ht_iter iter; |
5b4a0ec0 | 3466 | struct ust_app *app; |
c617c0c6 | 3467 | struct lttng_event *tmp_event; |
421cb601 | 3468 | |
5b4a0ec0 | 3469 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
3470 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
3471 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
3472 | PERROR("zmalloc ust app events"); |
3473 | ret = -ENOMEM; | |
421cb601 DG |
3474 | goto error; |
3475 | } | |
3476 | ||
5b4a0ec0 | 3477 | rcu_read_lock(); |
421cb601 | 3478 | |
852d0037 | 3479 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 3480 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 3481 | |
840cb59c | 3482 | health_code_update(); |
86acf0da | 3483 | |
e0c7ec2b DG |
3484 | if (!app->compatible) { |
3485 | /* | |
3486 | * TODO: In time, we should notice the caller of this error by | |
3487 | * telling him that this is a version error. | |
3488 | */ | |
3489 | continue; | |
3490 | } | |
fb45065e | 3491 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 3492 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 3493 | if (handle < 0) { |
ffe60014 DG |
3494 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3495 | ERR("UST app list events getting handle failed for app pid %d", | |
3496 | app->pid); | |
3497 | } | |
fb45065e | 3498 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 DG |
3499 | continue; |
3500 | } | |
421cb601 | 3501 | |
852d0037 | 3502 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 3503 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3504 | /* Handle ustctl error. */ |
3505 | if (ret < 0) { | |
fb45065e MD |
3506 | int release_ret; |
3507 | ||
a2ba1ab0 | 3508 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3509 | ERR("UST app tp list get failed for app %d with ret %d", |
3510 | app->sock, ret); | |
3511 | } else { | |
3512 | DBG3("UST app tp list get failed. Application is dead"); | |
3757b385 DG |
3513 | /* |
3514 | * This is normal behavior, an application can die during the | |
3515 | * creation process. Don't report an error so the execution can | |
3516 | * continue normally. Continue normal execution. | |
3517 | */ | |
3518 | break; | |
ffe60014 | 3519 | } |
98f595d4 | 3520 | free(tmp_event); |
fb45065e | 3521 | release_ret = ustctl_release_handle(app->sock, handle); |
68313703 JG |
3522 | if (release_ret < 0 && |
3523 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3524 | release_ret != -EPIPE) { | |
fb45065e MD |
3525 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3526 | } | |
3527 | pthread_mutex_unlock(&app->sock_lock); | |
ffe60014 DG |
3528 | goto rcu_error; |
3529 | } | |
3530 | ||
840cb59c | 3531 | health_code_update(); |
815564d8 | 3532 | if (count >= nbmem) { |
d7b3776f | 3533 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3534 | struct lttng_event *new_tmp_event; |
3535 | size_t new_nbmem; | |
3536 | ||
3537 | new_nbmem = nbmem << 1; | |
3538 | DBG2("Reallocating event list from %zu to %zu entries", | |
3539 | nbmem, new_nbmem); | |
3540 | new_tmp_event = realloc(tmp_event, | |
3541 | new_nbmem * sizeof(struct lttng_event)); | |
3542 | if (new_tmp_event == NULL) { | |
fb45065e MD |
3543 | int release_ret; |
3544 | ||
5b4a0ec0 | 3545 | PERROR("realloc ust app events"); |
c617c0c6 | 3546 | free(tmp_event); |
5b4a0ec0 | 3547 | ret = -ENOMEM; |
fb45065e | 3548 | release_ret = ustctl_release_handle(app->sock, handle); |
68313703 JG |
3549 | if (release_ret < 0 && |
3550 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3551 | release_ret != -EPIPE) { | |
fb45065e MD |
3552 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3553 | } | |
3554 | pthread_mutex_unlock(&app->sock_lock); | |
5b4a0ec0 DG |
3555 | goto rcu_error; |
3556 | } | |
53efb85a MD |
3557 | /* Zero the new memory */ |
3558 | memset(new_tmp_event + nbmem, 0, | |
3559 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
3560 | nbmem = new_nbmem; | |
3561 | tmp_event = new_tmp_event; | |
5b4a0ec0 | 3562 | } |
c617c0c6 MD |
3563 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
3564 | tmp_event[count].loglevel = uiter.loglevel; | |
3565 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
3566 | tmp_event[count].pid = app->pid; | |
3567 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 3568 | count++; |
421cb601 | 3569 | } |
fb45065e MD |
3570 | ret = ustctl_release_handle(app->sock, handle); |
3571 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 | 3572 | if (ret < 0 && ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
fb45065e MD |
3573 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
3574 | } | |
421cb601 DG |
3575 | } |
3576 | ||
5b4a0ec0 | 3577 | ret = count; |
c617c0c6 | 3578 | *events = tmp_event; |
421cb601 | 3579 | |
5b4a0ec0 | 3580 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 3581 | |
5b4a0ec0 DG |
3582 | rcu_error: |
3583 | rcu_read_unlock(); | |
421cb601 | 3584 | error: |
840cb59c | 3585 | health_code_update(); |
5b4a0ec0 | 3586 | return ret; |
421cb601 DG |
3587 | } |
3588 | ||
f37d259d MD |
3589 | /* |
3590 | * Fill events array with all events name of all registered apps. | |
3591 | */ | |
3592 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
3593 | { | |
3594 | int ret, handle; | |
3595 | size_t nbmem, count = 0; | |
3596 | struct lttng_ht_iter iter; | |
3597 | struct ust_app *app; | |
c617c0c6 | 3598 | struct lttng_event_field *tmp_event; |
f37d259d MD |
3599 | |
3600 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
3601 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
3602 | if (tmp_event == NULL) { | |
f37d259d MD |
3603 | PERROR("zmalloc ust app event fields"); |
3604 | ret = -ENOMEM; | |
3605 | goto error; | |
3606 | } | |
3607 | ||
3608 | rcu_read_lock(); | |
3609 | ||
3610 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3611 | struct lttng_ust_field_iter uiter; | |
3612 | ||
840cb59c | 3613 | health_code_update(); |
86acf0da | 3614 | |
f37d259d MD |
3615 | if (!app->compatible) { |
3616 | /* | |
3617 | * TODO: In time, we should notice the caller of this error by | |
3618 | * telling him that this is a version error. | |
3619 | */ | |
3620 | continue; | |
3621 | } | |
fb45065e | 3622 | pthread_mutex_lock(&app->sock_lock); |
f37d259d MD |
3623 | handle = ustctl_tracepoint_field_list(app->sock); |
3624 | if (handle < 0) { | |
ffe60014 DG |
3625 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3626 | ERR("UST app list field getting handle failed for app pid %d", | |
3627 | app->pid); | |
3628 | } | |
fb45065e | 3629 | pthread_mutex_unlock(&app->sock_lock); |
f37d259d MD |
3630 | continue; |
3631 | } | |
3632 | ||
3633 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 3634 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3635 | /* Handle ustctl error. */ |
3636 | if (ret < 0) { | |
fb45065e MD |
3637 | int release_ret; |
3638 | ||
a2ba1ab0 | 3639 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3640 | ERR("UST app tp list field failed for app %d with ret %d", |
3641 | app->sock, ret); | |
3642 | } else { | |
3643 | DBG3("UST app tp list field failed. Application is dead"); | |
3757b385 DG |
3644 | /* |
3645 | * This is normal behavior, an application can die during the | |
3646 | * creation process. Don't report an error so the execution can | |
98f595d4 | 3647 | * continue normally. Reset list and count for next app. |
3757b385 DG |
3648 | */ |
3649 | break; | |
ffe60014 | 3650 | } |
98f595d4 | 3651 | free(tmp_event); |
fb45065e MD |
3652 | release_ret = ustctl_release_handle(app->sock, handle); |
3653 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
3654 | if (release_ret < 0 && |
3655 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3656 | release_ret != -EPIPE) { | |
fb45065e MD |
3657 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3658 | } | |
ffe60014 DG |
3659 | goto rcu_error; |
3660 | } | |
3661 | ||
840cb59c | 3662 | health_code_update(); |
f37d259d | 3663 | if (count >= nbmem) { |
d7b3776f | 3664 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3665 | struct lttng_event_field *new_tmp_event; |
3666 | size_t new_nbmem; | |
3667 | ||
3668 | new_nbmem = nbmem << 1; | |
3669 | DBG2("Reallocating event field list from %zu to %zu entries", | |
3670 | nbmem, new_nbmem); | |
3671 | new_tmp_event = realloc(tmp_event, | |
3672 | new_nbmem * sizeof(struct lttng_event_field)); | |
3673 | if (new_tmp_event == NULL) { | |
fb45065e MD |
3674 | int release_ret; |
3675 | ||
f37d259d | 3676 | PERROR("realloc ust app event fields"); |
c617c0c6 | 3677 | free(tmp_event); |
f37d259d | 3678 | ret = -ENOMEM; |
fb45065e MD |
3679 | release_ret = ustctl_release_handle(app->sock, handle); |
3680 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
3681 | if (release_ret && |
3682 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3683 | release_ret != -EPIPE) { | |
fb45065e MD |
3684 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3685 | } | |
f37d259d MD |
3686 | goto rcu_error; |
3687 | } | |
53efb85a MD |
3688 | /* Zero the new memory */ |
3689 | memset(new_tmp_event + nbmem, 0, | |
3690 | (new_nbmem - nbmem) * sizeof(struct lttng_event_field)); | |
3691 | nbmem = new_nbmem; | |
3692 | tmp_event = new_tmp_event; | |
f37d259d | 3693 | } |
f37d259d | 3694 | |
c617c0c6 | 3695 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
2e84128e DG |
3696 | /* Mapping between these enums matches 1 to 1. */ |
3697 | tmp_event[count].type = (enum lttng_event_field_type) uiter.type; | |
c617c0c6 | 3698 | tmp_event[count].nowrite = uiter.nowrite; |
f37d259d | 3699 | |
c617c0c6 MD |
3700 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
3701 | tmp_event[count].event.loglevel = uiter.loglevel; | |
2e84128e | 3702 | tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; |
c617c0c6 MD |
3703 | tmp_event[count].event.pid = app->pid; |
3704 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
3705 | count++; |
3706 | } | |
fb45065e MD |
3707 | ret = ustctl_release_handle(app->sock, handle); |
3708 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
3709 | if (ret < 0 && |
3710 | ret != -LTTNG_UST_ERR_EXITING && | |
3711 | ret != -EPIPE) { | |
fb45065e MD |
3712 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
3713 | } | |
f37d259d MD |
3714 | } |
3715 | ||
3716 | ret = count; | |
c617c0c6 | 3717 | *fields = tmp_event; |
f37d259d MD |
3718 | |
3719 | DBG2("UST app list event fields done (%zu events)", count); | |
3720 | ||
3721 | rcu_error: | |
3722 | rcu_read_unlock(); | |
3723 | error: | |
840cb59c | 3724 | health_code_update(); |
f37d259d MD |
3725 | return ret; |
3726 | } | |
3727 | ||
5b4a0ec0 DG |
3728 | /* |
3729 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
3730 | * |
3731 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
3732 | */ |
3733 | void ust_app_clean_list(void) | |
421cb601 | 3734 | { |
5b4a0ec0 | 3735 | int ret; |
659ed79f | 3736 | struct ust_app *app; |
bec39940 | 3737 | struct lttng_ht_iter iter; |
421cb601 | 3738 | |
5b4a0ec0 | 3739 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3740 | |
5b4a0ec0 | 3741 | rcu_read_lock(); |
421cb601 | 3742 | |
f1b711c4 MD |
3743 | if (ust_app_ht) { |
3744 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3745 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3746 | assert(!ret); | |
3747 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
3748 | } | |
421cb601 DG |
3749 | } |
3750 | ||
852d0037 | 3751 | /* Cleanup socket hash table */ |
f1b711c4 MD |
3752 | if (ust_app_ht_by_sock) { |
3753 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, | |
3754 | sock_n.node) { | |
3755 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); | |
3756 | assert(!ret); | |
3757 | } | |
bec39940 | 3758 | } |
852d0037 | 3759 | |
d88aee68 | 3760 | /* Cleanup notify socket hash table */ |
f1b711c4 MD |
3761 | if (ust_app_ht_by_notify_sock) { |
3762 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3763 | notify_sock_n.node) { | |
3764 | ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3765 | assert(!ret); | |
3766 | } | |
d88aee68 | 3767 | } |
36b588ed | 3768 | rcu_read_unlock(); |
d88aee68 | 3769 | |
bec39940 | 3770 | /* Destroy is done only when the ht is empty */ |
f1b711c4 MD |
3771 | if (ust_app_ht) { |
3772 | ht_cleanup_push(ust_app_ht); | |
3773 | } | |
3774 | if (ust_app_ht_by_sock) { | |
3775 | ht_cleanup_push(ust_app_ht_by_sock); | |
3776 | } | |
3777 | if (ust_app_ht_by_notify_sock) { | |
3778 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
3779 | } | |
5b4a0ec0 DG |
3780 | } |
3781 | ||
3782 | /* | |
3783 | * Init UST app hash table. | |
3784 | */ | |
57703f6e | 3785 | int ust_app_ht_alloc(void) |
5b4a0ec0 | 3786 | { |
bec39940 | 3787 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3788 | if (!ust_app_ht) { |
3789 | return -1; | |
3790 | } | |
852d0037 | 3791 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3792 | if (!ust_app_ht_by_sock) { |
3793 | return -1; | |
3794 | } | |
d0b96690 | 3795 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3796 | if (!ust_app_ht_by_notify_sock) { |
3797 | return -1; | |
3798 | } | |
3799 | return 0; | |
421cb601 DG |
3800 | } |
3801 | ||
78f0bacd DG |
3802 | /* |
3803 | * For a specific UST session, disable the channel for all registered apps. | |
3804 | */ | |
35a9059d | 3805 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3806 | struct ltt_ust_channel *uchan) |
3807 | { | |
3808 | int ret = 0; | |
bec39940 DG |
3809 | struct lttng_ht_iter iter; |
3810 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3811 | struct ust_app *app; |
3812 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3813 | struct ust_app_channel *ua_chan; |
78f0bacd DG |
3814 | |
3815 | if (usess == NULL || uchan == NULL) { | |
3816 | ERR("Disabling UST global channel with NULL values"); | |
3817 | ret = -1; | |
3818 | goto error; | |
3819 | } | |
3820 | ||
d9bf3ca4 | 3821 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 3822 | uchan->name, usess->id); |
78f0bacd DG |
3823 | |
3824 | rcu_read_lock(); | |
3825 | ||
3826 | /* For every registered applications */ | |
852d0037 | 3827 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3828 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3829 | if (!app->compatible) { |
3830 | /* | |
3831 | * TODO: In time, we should notice the caller of this error by | |
3832 | * telling him that this is a version error. | |
3833 | */ | |
3834 | continue; | |
3835 | } | |
78f0bacd DG |
3836 | ua_sess = lookup_session_by_app(usess, app); |
3837 | if (ua_sess == NULL) { | |
3838 | continue; | |
3839 | } | |
3840 | ||
8535a6d9 | 3841 | /* Get channel */ |
bec39940 DG |
3842 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3843 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
3844 | /* If the session if found for the app, the channel must be there */ |
3845 | assert(ua_chan_node); | |
3846 | ||
3847 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3848 | /* The channel must not be already disabled */ | |
3849 | assert(ua_chan->enabled == 1); | |
3850 | ||
3851 | /* Disable channel onto application */ | |
3852 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
3853 | if (ret < 0) { |
3854 | /* XXX: We might want to report this error at some point... */ | |
3855 | continue; | |
3856 | } | |
3857 | } | |
3858 | ||
3859 | rcu_read_unlock(); | |
3860 | ||
3861 | error: | |
3862 | return ret; | |
3863 | } | |
3864 | ||
3865 | /* | |
3866 | * For a specific UST session, enable the channel for all registered apps. | |
3867 | */ | |
35a9059d | 3868 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3869 | struct ltt_ust_channel *uchan) |
3870 | { | |
3871 | int ret = 0; | |
bec39940 | 3872 | struct lttng_ht_iter iter; |
78f0bacd DG |
3873 | struct ust_app *app; |
3874 | struct ust_app_session *ua_sess; | |
3875 | ||
3876 | if (usess == NULL || uchan == NULL) { | |
3877 | ERR("Adding UST global channel to NULL values"); | |
3878 | ret = -1; | |
3879 | goto error; | |
3880 | } | |
3881 | ||
d9bf3ca4 | 3882 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 3883 | uchan->name, usess->id); |
78f0bacd DG |
3884 | |
3885 | rcu_read_lock(); | |
3886 | ||
3887 | /* For every registered applications */ | |
852d0037 | 3888 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3889 | if (!app->compatible) { |
3890 | /* | |
3891 | * TODO: In time, we should notice the caller of this error by | |
3892 | * telling him that this is a version error. | |
3893 | */ | |
3894 | continue; | |
3895 | } | |
78f0bacd DG |
3896 | ua_sess = lookup_session_by_app(usess, app); |
3897 | if (ua_sess == NULL) { | |
3898 | continue; | |
3899 | } | |
3900 | ||
3901 | /* Enable channel onto application */ | |
3902 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
3903 | if (ret < 0) { | |
3904 | /* XXX: We might want to report this error at some point... */ | |
3905 | continue; | |
3906 | } | |
3907 | } | |
3908 | ||
3909 | rcu_read_unlock(); | |
3910 | ||
3911 | error: | |
3912 | return ret; | |
3913 | } | |
3914 | ||
b0a40d28 DG |
3915 | /* |
3916 | * Disable an event in a channel and for a specific session. | |
3917 | */ | |
35a9059d DG |
3918 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
3919 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
3920 | { |
3921 | int ret = 0; | |
bec39940 | 3922 | struct lttng_ht_iter iter, uiter; |
700c5a9d | 3923 | struct lttng_ht_node_str *ua_chan_node; |
b0a40d28 DG |
3924 | struct ust_app *app; |
3925 | struct ust_app_session *ua_sess; | |
3926 | struct ust_app_channel *ua_chan; | |
3927 | struct ust_app_event *ua_event; | |
3928 | ||
3929 | DBG("UST app disabling event %s for all apps in channel " | |
d9bf3ca4 MD |
3930 | "%s for session id %" PRIu64, |
3931 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
3932 | |
3933 | rcu_read_lock(); | |
3934 | ||
3935 | /* For all registered applications */ | |
852d0037 | 3936 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3937 | if (!app->compatible) { |
3938 | /* | |
3939 | * TODO: In time, we should notice the caller of this error by | |
3940 | * telling him that this is a version error. | |
3941 | */ | |
3942 | continue; | |
3943 | } | |
b0a40d28 DG |
3944 | ua_sess = lookup_session_by_app(usess, app); |
3945 | if (ua_sess == NULL) { | |
3946 | /* Next app */ | |
3947 | continue; | |
3948 | } | |
3949 | ||
3950 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3951 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3952 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 3953 | if (ua_chan_node == NULL) { |
d9bf3ca4 | 3954 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 3955 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
3956 | continue; |
3957 | } | |
3958 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3959 | ||
700c5a9d JR |
3960 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
3961 | uevent->filter, uevent->attr.loglevel, | |
3962 | uevent->exclusion); | |
3963 | if (ua_event == NULL) { | |
b0a40d28 | 3964 | DBG2("Event %s not found in channel %s for app pid %d." |
852d0037 | 3965 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
3966 | continue; |
3967 | } | |
b0a40d28 | 3968 | |
7f79d3a1 | 3969 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
3970 | if (ret < 0) { |
3971 | /* XXX: Report error someday... */ | |
3972 | continue; | |
3973 | } | |
3974 | } | |
3975 | ||
3976 | rcu_read_unlock(); | |
3977 | ||
3978 | return ret; | |
3979 | } | |
3980 | ||
421cb601 | 3981 | /* |
5b4a0ec0 | 3982 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 3983 | */ |
35a9059d | 3984 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3985 | struct ltt_ust_channel *uchan) |
3986 | { | |
3d8ca23b | 3987 | int ret = 0, created; |
bec39940 | 3988 | struct lttng_ht_iter iter; |
48842b30 | 3989 | struct ust_app *app; |
3d8ca23b | 3990 | struct ust_app_session *ua_sess = NULL; |
48842b30 | 3991 | |
fc34caaa DG |
3992 | /* Very wrong code flow */ |
3993 | assert(usess); | |
3994 | assert(uchan); | |
421cb601 | 3995 | |
d9bf3ca4 | 3996 | DBG2("UST app adding channel %s to UST domain for session id %" PRIu64, |
a991f516 | 3997 | uchan->name, usess->id); |
48842b30 DG |
3998 | |
3999 | rcu_read_lock(); | |
421cb601 | 4000 | |
5b4a0ec0 | 4001 | /* For every registered applications */ |
852d0037 | 4002 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4003 | if (!app->compatible) { |
4004 | /* | |
4005 | * TODO: In time, we should notice the caller of this error by | |
4006 | * telling him that this is a version error. | |
4007 | */ | |
4008 | continue; | |
4009 | } | |
a9ad0c8f MD |
4010 | if (!trace_ust_pid_tracker_lookup(usess, app->pid)) { |
4011 | /* Skip. */ | |
4012 | continue; | |
4013 | } | |
4014 | ||
edb67388 DG |
4015 | /* |
4016 | * Create session on the tracer side and add it to app session HT. Note | |
4017 | * that if session exist, it will simply return a pointer to the ust | |
4018 | * app session. | |
4019 | */ | |
3d8ca23b DG |
4020 | ret = create_ust_app_session(usess, app, &ua_sess, &created); |
4021 | if (ret < 0) { | |
4022 | switch (ret) { | |
4023 | case -ENOTCONN: | |
4024 | /* | |
4025 | * The application's socket is not valid. Either a bad socket | |
4026 | * or a timeout on it. We can't inform the caller that for a | |
4027 | * specific app, the session failed so lets continue here. | |
4028 | */ | |
a7169585 | 4029 | ret = 0; /* Not an error. */ |
3d8ca23b DG |
4030 | continue; |
4031 | case -ENOMEM: | |
4032 | default: | |
4033 | goto error_rcu_unlock; | |
4034 | } | |
48842b30 | 4035 | } |
3d8ca23b | 4036 | assert(ua_sess); |
48842b30 | 4037 | |
d0b96690 | 4038 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
4039 | |
4040 | if (ua_sess->deleted) { | |
4041 | pthread_mutex_unlock(&ua_sess->lock); | |
4042 | continue; | |
4043 | } | |
4044 | ||
d65d2de8 DG |
4045 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, |
4046 | sizeof(uchan->name))) { | |
ad7a9107 DG |
4047 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, &uchan->attr); |
4048 | ret = 0; | |
d65d2de8 DG |
4049 | } else { |
4050 | /* Create channel onto application. We don't need the chan ref. */ | |
4051 | ret = create_ust_app_channel(ua_sess, uchan, app, | |
4052 | LTTNG_UST_CHAN_PER_CPU, usess, NULL); | |
4053 | } | |
d0b96690 | 4054 | pthread_mutex_unlock(&ua_sess->lock); |
3d8ca23b | 4055 | if (ret < 0) { |
3d8ca23b DG |
4056 | /* Cleanup the created session if it's the case. */ |
4057 | if (created) { | |
d0b96690 | 4058 | destroy_app_session(app, ua_sess); |
3d8ca23b | 4059 | } |
a7169585 MD |
4060 | switch (ret) { |
4061 | case -ENOTCONN: | |
4062 | /* | |
4063 | * The application's socket is not valid. Either a bad socket | |
4064 | * or a timeout on it. We can't inform the caller that for a | |
4065 | * specific app, the session failed so lets continue here. | |
4066 | */ | |
4067 | ret = 0; /* Not an error. */ | |
4068 | continue; | |
4069 | case -ENOMEM: | |
4070 | default: | |
4071 | goto error_rcu_unlock; | |
4072 | } | |
48842b30 | 4073 | } |
48842b30 | 4074 | } |
5b4a0ec0 | 4075 | |
95e047ff | 4076 | error_rcu_unlock: |
48842b30 | 4077 | rcu_read_unlock(); |
3c14c33f | 4078 | return ret; |
48842b30 DG |
4079 | } |
4080 | ||
5b4a0ec0 | 4081 | /* |
edb67388 | 4082 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 4083 | */ |
35a9059d | 4084 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
4085 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4086 | { | |
4087 | int ret = 0; | |
bec39940 | 4088 | struct lttng_ht_iter iter, uiter; |
18eace3b | 4089 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
4090 | struct ust_app *app; |
4091 | struct ust_app_session *ua_sess; | |
4092 | struct ust_app_channel *ua_chan; | |
4093 | struct ust_app_event *ua_event; | |
48842b30 | 4094 | |
d9bf3ca4 | 4095 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 4096 | uevent->attr.name, usess->id); |
48842b30 | 4097 | |
edb67388 DG |
4098 | /* |
4099 | * NOTE: At this point, this function is called only if the session and | |
4100 | * channel passed are already created for all apps. and enabled on the | |
4101 | * tracer also. | |
4102 | */ | |
4103 | ||
48842b30 | 4104 | rcu_read_lock(); |
421cb601 DG |
4105 | |
4106 | /* For all registered applications */ | |
852d0037 | 4107 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4108 | if (!app->compatible) { |
4109 | /* | |
4110 | * TODO: In time, we should notice the caller of this error by | |
4111 | * telling him that this is a version error. | |
4112 | */ | |
4113 | continue; | |
4114 | } | |
edb67388 | 4115 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4116 | if (!ua_sess) { |
4117 | /* The application has problem or is probably dead. */ | |
4118 | continue; | |
4119 | } | |
ba767faf | 4120 | |
d0b96690 DG |
4121 | pthread_mutex_lock(&ua_sess->lock); |
4122 | ||
b161602a MD |
4123 | if (ua_sess->deleted) { |
4124 | pthread_mutex_unlock(&ua_sess->lock); | |
4125 | continue; | |
4126 | } | |
4127 | ||
edb67388 | 4128 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4129 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4130 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
a7169585 MD |
4131 | /* |
4132 | * It is possible that the channel cannot be found is | |
4133 | * the channel/event creation occurs concurrently with | |
4134 | * an application exit. | |
4135 | */ | |
4136 | if (!ua_chan_node) { | |
4137 | pthread_mutex_unlock(&ua_sess->lock); | |
4138 | continue; | |
4139 | } | |
edb67388 DG |
4140 | |
4141 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4142 | ||
18eace3b DG |
4143 | /* Get event node */ |
4144 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
39c5a3a7 | 4145 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 4146 | if (ua_event == NULL) { |
7f79d3a1 | 4147 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 4148 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 4149 | goto next_app; |
35a9059d | 4150 | } |
35a9059d DG |
4151 | |
4152 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
4153 | if (ret < 0) { | |
d0b96690 | 4154 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 4155 | goto error; |
48842b30 | 4156 | } |
d0b96690 DG |
4157 | next_app: |
4158 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
4159 | } |
4160 | ||
7f79d3a1 | 4161 | error: |
edb67388 | 4162 | rcu_read_unlock(); |
edb67388 DG |
4163 | return ret; |
4164 | } | |
4165 | ||
4166 | /* | |
4167 | * For a specific existing UST session and UST channel, creates the event for | |
4168 | * all registered apps. | |
4169 | */ | |
35a9059d | 4170 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
4171 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4172 | { | |
4173 | int ret = 0; | |
bec39940 DG |
4174 | struct lttng_ht_iter iter, uiter; |
4175 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
4176 | struct ust_app *app; |
4177 | struct ust_app_session *ua_sess; | |
4178 | struct ust_app_channel *ua_chan; | |
4179 | ||
d9bf3ca4 | 4180 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 4181 | uevent->attr.name, usess->id); |
edb67388 | 4182 | |
edb67388 DG |
4183 | rcu_read_lock(); |
4184 | ||
4185 | /* For all registered applications */ | |
852d0037 | 4186 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4187 | if (!app->compatible) { |
4188 | /* | |
4189 | * TODO: In time, we should notice the caller of this error by | |
4190 | * telling him that this is a version error. | |
4191 | */ | |
4192 | continue; | |
4193 | } | |
edb67388 | 4194 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4195 | if (!ua_sess) { |
4196 | /* The application has problem or is probably dead. */ | |
4197 | continue; | |
4198 | } | |
48842b30 | 4199 | |
d0b96690 | 4200 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
4201 | |
4202 | if (ua_sess->deleted) { | |
4203 | pthread_mutex_unlock(&ua_sess->lock); | |
4204 | continue; | |
4205 | } | |
4206 | ||
48842b30 | 4207 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4208 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4209 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
4210 | /* If the channel is not found, there is a code flow error */ |
4211 | assert(ua_chan_node); | |
4212 | ||
48842b30 DG |
4213 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
4214 | ||
edb67388 | 4215 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 4216 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 4217 | if (ret < 0) { |
49c336c1 | 4218 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
4219 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
4220 | break; | |
4221 | } | |
4222 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 4223 | uevent->attr.name, app->pid); |
5b4a0ec0 | 4224 | continue; |
48842b30 | 4225 | } |
48842b30 | 4226 | } |
5b4a0ec0 | 4227 | |
48842b30 DG |
4228 | rcu_read_unlock(); |
4229 | ||
4230 | return ret; | |
4231 | } | |
4232 | ||
5b4a0ec0 DG |
4233 | /* |
4234 | * Start tracing for a specific UST session and app. | |
4235 | */ | |
b34cbebf | 4236 | static |
421cb601 | 4237 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
4238 | { |
4239 | int ret = 0; | |
48842b30 | 4240 | struct ust_app_session *ua_sess; |
48842b30 | 4241 | |
852d0037 | 4242 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 4243 | |
509cbaf8 MD |
4244 | rcu_read_lock(); |
4245 | ||
e0c7ec2b DG |
4246 | if (!app->compatible) { |
4247 | goto end; | |
4248 | } | |
4249 | ||
421cb601 DG |
4250 | ua_sess = lookup_session_by_app(usess, app); |
4251 | if (ua_sess == NULL) { | |
d42f20df DG |
4252 | /* The session is in teardown process. Ignore and continue. */ |
4253 | goto end; | |
421cb601 | 4254 | } |
48842b30 | 4255 | |
d0b96690 DG |
4256 | pthread_mutex_lock(&ua_sess->lock); |
4257 | ||
b161602a MD |
4258 | if (ua_sess->deleted) { |
4259 | pthread_mutex_unlock(&ua_sess->lock); | |
4260 | goto end; | |
4261 | } | |
4262 | ||
aea829b3 DG |
4263 | /* Upon restart, we skip the setup, already done */ |
4264 | if (ua_sess->started) { | |
8be98f9a | 4265 | goto skip_setup; |
aea829b3 | 4266 | } |
8be98f9a | 4267 | |
a4b92340 DG |
4268 | /* Create directories if consumer is LOCAL and has a path defined. */ |
4269 | if (usess->consumer->type == CONSUMER_DST_LOCAL && | |
4270 | strlen(usess->consumer->dst.trace_path) > 0) { | |
4271 | ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path, | |
7972aab2 | 4272 | S_IRWXU | S_IRWXG, ua_sess->euid, ua_sess->egid); |
a4b92340 | 4273 | if (ret < 0) { |
df5b86c8 | 4274 | if (errno != EEXIST) { |
a4b92340 | 4275 | ERR("Trace directory creation error"); |
d0b96690 | 4276 | goto error_unlock; |
421cb601 | 4277 | } |
173af62f | 4278 | } |
7753dea8 | 4279 | } |
aea829b3 | 4280 | |
d65d2de8 DG |
4281 | /* |
4282 | * Create the metadata for the application. This returns gracefully if a | |
4283 | * metadata was already set for the session. | |
4284 | */ | |
ad7a9107 | 4285 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer); |
421cb601 | 4286 | if (ret < 0) { |
d0b96690 | 4287 | goto error_unlock; |
421cb601 | 4288 | } |
48842b30 | 4289 | |
840cb59c | 4290 | health_code_update(); |
86acf0da | 4291 | |
8be98f9a | 4292 | skip_setup: |
421cb601 | 4293 | /* This start the UST tracing */ |
fb45065e | 4294 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4295 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
fb45065e | 4296 | pthread_mutex_unlock(&app->sock_lock); |
421cb601 | 4297 | if (ret < 0) { |
ffe60014 DG |
4298 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4299 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
4300 | app->pid, ret); | |
4301 | } else { | |
4302 | DBG("UST app start session failed. Application is dead."); | |
3757b385 DG |
4303 | /* |
4304 | * This is normal behavior, an application can die during the | |
4305 | * creation process. Don't report an error so the execution can | |
4306 | * continue normally. | |
4307 | */ | |
4308 | pthread_mutex_unlock(&ua_sess->lock); | |
4309 | goto end; | |
ffe60014 | 4310 | } |
d0b96690 | 4311 | goto error_unlock; |
421cb601 | 4312 | } |
5b4a0ec0 | 4313 | |
55c3953d DG |
4314 | /* Indicate that the session has been started once */ |
4315 | ua_sess->started = 1; | |
4316 | ||
d0b96690 DG |
4317 | pthread_mutex_unlock(&ua_sess->lock); |
4318 | ||
840cb59c | 4319 | health_code_update(); |
86acf0da | 4320 | |
421cb601 | 4321 | /* Quiescent wait after starting trace */ |
fb45065e | 4322 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4323 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4324 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4325 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4326 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4327 | app->pid, ret); | |
4328 | } | |
48842b30 | 4329 | |
e0c7ec2b DG |
4330 | end: |
4331 | rcu_read_unlock(); | |
840cb59c | 4332 | health_code_update(); |
421cb601 | 4333 | return 0; |
48842b30 | 4334 | |
d0b96690 DG |
4335 | error_unlock: |
4336 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 4337 | rcu_read_unlock(); |
840cb59c | 4338 | health_code_update(); |
421cb601 DG |
4339 | return -1; |
4340 | } | |
48842b30 | 4341 | |
8be98f9a MD |
4342 | /* |
4343 | * Stop tracing for a specific UST session and app. | |
4344 | */ | |
b34cbebf | 4345 | static |
8be98f9a MD |
4346 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
4347 | { | |
4348 | int ret = 0; | |
4349 | struct ust_app_session *ua_sess; | |
7972aab2 | 4350 | struct ust_registry_session *registry; |
8be98f9a | 4351 | |
852d0037 | 4352 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
4353 | |
4354 | rcu_read_lock(); | |
4355 | ||
e0c7ec2b | 4356 | if (!app->compatible) { |
d88aee68 | 4357 | goto end_no_session; |
e0c7ec2b DG |
4358 | } |
4359 | ||
8be98f9a MD |
4360 | ua_sess = lookup_session_by_app(usess, app); |
4361 | if (ua_sess == NULL) { | |
d88aee68 | 4362 | goto end_no_session; |
8be98f9a MD |
4363 | } |
4364 | ||
d88aee68 DG |
4365 | pthread_mutex_lock(&ua_sess->lock); |
4366 | ||
b161602a MD |
4367 | if (ua_sess->deleted) { |
4368 | pthread_mutex_unlock(&ua_sess->lock); | |
4369 | goto end_no_session; | |
4370 | } | |
4371 | ||
9bc07046 DG |
4372 | /* |
4373 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
4374 | * that was never started. It's possible since we can have a fail start |
4375 | * from either the application manager thread or the command thread. Simply | |
4376 | * indicate that this is a stop error. | |
9bc07046 | 4377 | */ |
f9dfc3d9 | 4378 | if (!ua_sess->started) { |
c45536e1 DG |
4379 | goto error_rcu_unlock; |
4380 | } | |
7db205b5 | 4381 | |
840cb59c | 4382 | health_code_update(); |
86acf0da | 4383 | |
9d6c7d3f | 4384 | /* This inhibits UST tracing */ |
fb45065e | 4385 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4386 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
fb45065e | 4387 | pthread_mutex_unlock(&app->sock_lock); |
9d6c7d3f | 4388 | if (ret < 0) { |
ffe60014 DG |
4389 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4390 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
4391 | app->pid, ret); | |
4392 | } else { | |
4393 | DBG("UST app stop session failed. Application is dead."); | |
3757b385 DG |
4394 | /* |
4395 | * This is normal behavior, an application can die during the | |
4396 | * creation process. Don't report an error so the execution can | |
4397 | * continue normally. | |
4398 | */ | |
4399 | goto end_unlock; | |
ffe60014 | 4400 | } |
9d6c7d3f DG |
4401 | goto error_rcu_unlock; |
4402 | } | |
4403 | ||
840cb59c | 4404 | health_code_update(); |
86acf0da | 4405 | |
9d6c7d3f | 4406 | /* Quiescent wait after stopping trace */ |
fb45065e | 4407 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4408 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4409 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4410 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4411 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4412 | app->pid, ret); | |
4413 | } | |
9d6c7d3f | 4414 | |
840cb59c | 4415 | health_code_update(); |
86acf0da | 4416 | |
b34cbebf MD |
4417 | registry = get_session_registry(ua_sess); |
4418 | assert(registry); | |
1b532a60 | 4419 | |
ce34fcd0 MD |
4420 | /* Push metadata for application before freeing the application. */ |
4421 | (void) push_metadata(registry, ua_sess->consumer); | |
b34cbebf | 4422 | |
3757b385 | 4423 | end_unlock: |
b34cbebf MD |
4424 | pthread_mutex_unlock(&ua_sess->lock); |
4425 | end_no_session: | |
4426 | rcu_read_unlock(); | |
4427 | health_code_update(); | |
4428 | return 0; | |
4429 | ||
4430 | error_rcu_unlock: | |
4431 | pthread_mutex_unlock(&ua_sess->lock); | |
4432 | rcu_read_unlock(); | |
4433 | health_code_update(); | |
4434 | return -1; | |
4435 | } | |
4436 | ||
b34cbebf | 4437 | static |
c4b88406 MD |
4438 | int ust_app_flush_app_session(struct ust_app *app, |
4439 | struct ust_app_session *ua_sess) | |
b34cbebf | 4440 | { |
c4b88406 | 4441 | int ret, retval = 0; |
b34cbebf | 4442 | struct lttng_ht_iter iter; |
b34cbebf | 4443 | struct ust_app_channel *ua_chan; |
c4b88406 | 4444 | struct consumer_socket *socket; |
b34cbebf | 4445 | |
c4b88406 | 4446 | DBG("Flushing app session buffers for ust app pid %d", app->pid); |
b34cbebf MD |
4447 | |
4448 | rcu_read_lock(); | |
4449 | ||
4450 | if (!app->compatible) { | |
c4b88406 | 4451 | goto end_not_compatible; |
b34cbebf MD |
4452 | } |
4453 | ||
4454 | pthread_mutex_lock(&ua_sess->lock); | |
4455 | ||
b161602a MD |
4456 | if (ua_sess->deleted) { |
4457 | goto end_deleted; | |
4458 | } | |
4459 | ||
b34cbebf MD |
4460 | health_code_update(); |
4461 | ||
9d6c7d3f | 4462 | /* Flushing buffers */ |
c4b88406 MD |
4463 | socket = consumer_find_socket_by_bitness(app->bits_per_long, |
4464 | ua_sess->consumer); | |
ce34fcd0 MD |
4465 | |
4466 | /* Flush buffers and push metadata. */ | |
4467 | switch (ua_sess->buffer_type) { | |
4468 | case LTTNG_BUFFER_PER_PID: | |
4469 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, | |
4470 | node.node) { | |
4471 | health_code_update(); | |
4472 | assert(ua_chan->is_sent); | |
4473 | ret = consumer_flush_channel(socket, ua_chan->key); | |
4474 | if (ret) { | |
4475 | ERR("Error flushing consumer channel"); | |
4476 | retval = -1; | |
4477 | continue; | |
4478 | } | |
8be98f9a | 4479 | } |
ce34fcd0 MD |
4480 | break; |
4481 | case LTTNG_BUFFER_PER_UID: | |
4482 | default: | |
4483 | assert(0); | |
4484 | break; | |
8be98f9a | 4485 | } |
8be98f9a | 4486 | |
840cb59c | 4487 | health_code_update(); |
86acf0da | 4488 | |
b161602a | 4489 | end_deleted: |
d88aee68 | 4490 | pthread_mutex_unlock(&ua_sess->lock); |
ce34fcd0 | 4491 | |
c4b88406 MD |
4492 | end_not_compatible: |
4493 | rcu_read_unlock(); | |
4494 | health_code_update(); | |
4495 | return retval; | |
4496 | } | |
4497 | ||
4498 | /* | |
ce34fcd0 MD |
4499 | * Flush buffers for all applications for a specific UST session. |
4500 | * Called with UST session lock held. | |
c4b88406 MD |
4501 | */ |
4502 | static | |
ce34fcd0 | 4503 | int ust_app_flush_session(struct ltt_ust_session *usess) |
c4b88406 MD |
4504 | |
4505 | { | |
99b1411c | 4506 | int ret = 0; |
c4b88406 | 4507 | |
ce34fcd0 | 4508 | DBG("Flushing session buffers for all ust apps"); |
c4b88406 MD |
4509 | |
4510 | rcu_read_lock(); | |
4511 | ||
ce34fcd0 MD |
4512 | /* Flush buffers and push metadata. */ |
4513 | switch (usess->buffer_type) { | |
4514 | case LTTNG_BUFFER_PER_UID: | |
4515 | { | |
4516 | struct buffer_reg_uid *reg; | |
4517 | struct lttng_ht_iter iter; | |
4518 | ||
4519 | /* Flush all per UID buffers associated to that session. */ | |
4520 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
4521 | struct ust_registry_session *ust_session_reg; | |
4522 | struct buffer_reg_channel *reg_chan; | |
4523 | struct consumer_socket *socket; | |
4524 | ||
4525 | /* Get consumer socket to use to push the metadata.*/ | |
4526 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
4527 | usess->consumer); | |
4528 | if (!socket) { | |
4529 | /* Ignore request if no consumer is found for the session. */ | |
4530 | continue; | |
4531 | } | |
4532 | ||
4533 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
4534 | reg_chan, node.node) { | |
4535 | /* | |
4536 | * The following call will print error values so the return | |
4537 | * code is of little importance because whatever happens, we | |
4538 | * have to try them all. | |
4539 | */ | |
4540 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
4541 | } | |
4542 | ||
4543 | ust_session_reg = reg->registry->reg.ust; | |
4544 | /* Push metadata. */ | |
4545 | (void) push_metadata(ust_session_reg, usess->consumer); | |
4546 | } | |
ce34fcd0 MD |
4547 | break; |
4548 | } | |
4549 | case LTTNG_BUFFER_PER_PID: | |
4550 | { | |
4551 | struct ust_app_session *ua_sess; | |
4552 | struct lttng_ht_iter iter; | |
4553 | struct ust_app *app; | |
4554 | ||
4555 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4556 | ua_sess = lookup_session_by_app(usess, app); | |
4557 | if (ua_sess == NULL) { | |
4558 | continue; | |
4559 | } | |
4560 | (void) ust_app_flush_app_session(app, ua_sess); | |
4561 | } | |
4562 | break; | |
4563 | } | |
4564 | default: | |
99b1411c | 4565 | ret = -1; |
ce34fcd0 MD |
4566 | assert(0); |
4567 | break; | |
c4b88406 | 4568 | } |
c4b88406 | 4569 | |
7db205b5 | 4570 | rcu_read_unlock(); |
840cb59c | 4571 | health_code_update(); |
c4b88406 | 4572 | return ret; |
8be98f9a MD |
4573 | } |
4574 | ||
84cd17c6 MD |
4575 | /* |
4576 | * Destroy a specific UST session in apps. | |
4577 | */ | |
3353de95 | 4578 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 4579 | { |
ffe60014 | 4580 | int ret; |
84cd17c6 | 4581 | struct ust_app_session *ua_sess; |
bec39940 | 4582 | struct lttng_ht_iter iter; |
d9bf3ca4 | 4583 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 4584 | |
852d0037 | 4585 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
4586 | |
4587 | rcu_read_lock(); | |
4588 | ||
e0c7ec2b DG |
4589 | if (!app->compatible) { |
4590 | goto end; | |
4591 | } | |
4592 | ||
84cd17c6 | 4593 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 4594 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 4595 | if (node == NULL) { |
d42f20df DG |
4596 | /* Session is being or is deleted. */ |
4597 | goto end; | |
84cd17c6 MD |
4598 | } |
4599 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 4600 | |
840cb59c | 4601 | health_code_update(); |
d0b96690 | 4602 | destroy_app_session(app, ua_sess); |
84cd17c6 | 4603 | |
840cb59c | 4604 | health_code_update(); |
7db205b5 | 4605 | |
84cd17c6 | 4606 | /* Quiescent wait after stopping trace */ |
fb45065e | 4607 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4608 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4609 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4610 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4611 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4612 | app->pid, ret); | |
4613 | } | |
e0c7ec2b DG |
4614 | end: |
4615 | rcu_read_unlock(); | |
840cb59c | 4616 | health_code_update(); |
84cd17c6 | 4617 | return 0; |
84cd17c6 MD |
4618 | } |
4619 | ||
5b4a0ec0 DG |
4620 | /* |
4621 | * Start tracing for the UST session. | |
4622 | */ | |
421cb601 DG |
4623 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
4624 | { | |
4625 | int ret = 0; | |
bec39940 | 4626 | struct lttng_ht_iter iter; |
421cb601 | 4627 | struct ust_app *app; |
48842b30 | 4628 | |
421cb601 DG |
4629 | DBG("Starting all UST traces"); |
4630 | ||
4631 | rcu_read_lock(); | |
421cb601 | 4632 | |
852d0037 | 4633 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
421cb601 | 4634 | ret = ust_app_start_trace(usess, app); |
48842b30 | 4635 | if (ret < 0) { |
5b4a0ec0 DG |
4636 | /* Continue to next apps even on error */ |
4637 | continue; | |
48842b30 | 4638 | } |
48842b30 | 4639 | } |
5b4a0ec0 | 4640 | |
48842b30 DG |
4641 | rcu_read_unlock(); |
4642 | ||
4643 | return 0; | |
4644 | } | |
487cf67c | 4645 | |
8be98f9a MD |
4646 | /* |
4647 | * Start tracing for the UST session. | |
ce34fcd0 | 4648 | * Called with UST session lock held. |
8be98f9a MD |
4649 | */ |
4650 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
4651 | { | |
4652 | int ret = 0; | |
bec39940 | 4653 | struct lttng_ht_iter iter; |
8be98f9a MD |
4654 | struct ust_app *app; |
4655 | ||
4656 | DBG("Stopping all UST traces"); | |
4657 | ||
4658 | rcu_read_lock(); | |
4659 | ||
b34cbebf MD |
4660 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4661 | ret = ust_app_stop_trace(usess, app); | |
4662 | if (ret < 0) { | |
4663 | /* Continue to next apps even on error */ | |
4664 | continue; | |
4665 | } | |
4666 | } | |
4667 | ||
ce34fcd0 | 4668 | (void) ust_app_flush_session(usess); |
8be98f9a MD |
4669 | |
4670 | rcu_read_unlock(); | |
4671 | ||
4672 | return 0; | |
4673 | } | |
4674 | ||
84cd17c6 MD |
4675 | /* |
4676 | * Destroy app UST session. | |
4677 | */ | |
4678 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
4679 | { | |
4680 | int ret = 0; | |
bec39940 | 4681 | struct lttng_ht_iter iter; |
84cd17c6 MD |
4682 | struct ust_app *app; |
4683 | ||
4684 | DBG("Destroy all UST traces"); | |
4685 | ||
4686 | rcu_read_lock(); | |
4687 | ||
852d0037 | 4688 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 4689 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
4690 | if (ret < 0) { |
4691 | /* Continue to next apps even on error */ | |
4692 | continue; | |
4693 | } | |
4694 | } | |
4695 | ||
4696 | rcu_read_unlock(); | |
4697 | ||
4698 | return 0; | |
4699 | } | |
4700 | ||
a9ad0c8f MD |
4701 | static |
4702 | void ust_app_global_create(struct ltt_ust_session *usess, struct ust_app *app) | |
487cf67c | 4703 | { |
55c54cce | 4704 | int ret = 0; |
31746f93 | 4705 | struct lttng_ht_iter iter, uiter; |
3d8ca23b | 4706 | struct ust_app_session *ua_sess = NULL; |
487cf67c DG |
4707 | struct ust_app_channel *ua_chan; |
4708 | struct ust_app_event *ua_event; | |
727d5404 | 4709 | struct ust_app_ctx *ua_ctx; |
a9ad0c8f | 4710 | int is_created = 0; |
1f3580c7 | 4711 | |
a9ad0c8f | 4712 | ret = create_ust_app_session(usess, app, &ua_sess, &is_created); |
3d8ca23b DG |
4713 | if (ret < 0) { |
4714 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
4715 | goto error; |
4716 | } | |
a9ad0c8f MD |
4717 | if (!is_created) { |
4718 | /* App session already created. */ | |
4719 | goto end; | |
4720 | } | |
3d8ca23b | 4721 | assert(ua_sess); |
487cf67c | 4722 | |
d0b96690 DG |
4723 | pthread_mutex_lock(&ua_sess->lock); |
4724 | ||
b161602a MD |
4725 | if (ua_sess->deleted) { |
4726 | pthread_mutex_unlock(&ua_sess->lock); | |
4727 | goto end; | |
4728 | } | |
4729 | ||
284d8f55 | 4730 | /* |
d0b96690 | 4731 | * We can iterate safely here over all UST app session since the create ust |
284d8f55 DG |
4732 | * app session above made a shadow copy of the UST global domain from the |
4733 | * ltt ust session. | |
4734 | */ | |
bec39940 DG |
4735 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
4736 | node.node) { | |
ad7a9107 | 4737 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
a7169585 | 4738 | if (ret < 0 && ret != -ENOTCONN) { |
ad7a9107 | 4739 | /* |
a7169585 MD |
4740 | * Stop everything. On error, the application |
4741 | * failed, no more file descriptor are available | |
4742 | * or ENOMEM so stopping here is the only thing | |
4743 | * we can do for now. The only exception is | |
4744 | * -ENOTCONN, which indicates that the application | |
4745 | * has exit. | |
ad7a9107 DG |
4746 | */ |
4747 | goto error_unlock; | |
487cf67c DG |
4748 | } |
4749 | ||
31746f93 DG |
4750 | /* |
4751 | * Add context using the list so they are enabled in the same order the | |
4752 | * user added them. | |
4753 | */ | |
4754 | cds_list_for_each_entry(ua_ctx, &ua_chan->ctx_list, list) { | |
727d5404 DG |
4755 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); |
4756 | if (ret < 0) { | |
d0b96690 | 4757 | goto error_unlock; |
727d5404 DG |
4758 | } |
4759 | } | |
4760 | ||
4761 | ||
284d8f55 | 4762 | /* For each events */ |
bec39940 DG |
4763 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
4764 | node.node) { | |
284d8f55 DG |
4765 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
4766 | if (ret < 0) { | |
d0b96690 | 4767 | goto error_unlock; |
487cf67c | 4768 | } |
36dc12cc | 4769 | } |
487cf67c DG |
4770 | } |
4771 | ||
d0b96690 DG |
4772 | pthread_mutex_unlock(&ua_sess->lock); |
4773 | ||
14fb1ebe | 4774 | if (usess->active) { |
421cb601 | 4775 | ret = ust_app_start_trace(usess, app); |
36dc12cc | 4776 | if (ret < 0) { |
36dc12cc DG |
4777 | goto error; |
4778 | } | |
4779 | ||
852d0037 | 4780 | DBG2("UST trace started for app pid %d", app->pid); |
36dc12cc | 4781 | } |
a9ad0c8f | 4782 | end: |
ffe60014 | 4783 | /* Everything went well at this point. */ |
ffe60014 DG |
4784 | return; |
4785 | ||
d0b96690 DG |
4786 | error_unlock: |
4787 | pthread_mutex_unlock(&ua_sess->lock); | |
487cf67c | 4788 | error: |
ffe60014 | 4789 | if (ua_sess) { |
d0b96690 | 4790 | destroy_app_session(app, ua_sess); |
ffe60014 | 4791 | } |
487cf67c DG |
4792 | return; |
4793 | } | |
55cc08a6 | 4794 | |
a9ad0c8f MD |
4795 | static |
4796 | void ust_app_global_destroy(struct ltt_ust_session *usess, struct ust_app *app) | |
4797 | { | |
4798 | struct ust_app_session *ua_sess; | |
4799 | ||
4800 | ua_sess = lookup_session_by_app(usess, app); | |
4801 | if (ua_sess == NULL) { | |
4802 | return; | |
4803 | } | |
4804 | destroy_app_session(app, ua_sess); | |
4805 | } | |
4806 | ||
4807 | /* | |
4808 | * Add channels/events from UST global domain to registered apps at sock. | |
4809 | * | |
4810 | * Called with session lock held. | |
4811 | * Called with RCU read-side lock held. | |
4812 | */ | |
4813 | void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app) | |
4814 | { | |
4815 | assert(usess); | |
4816 | ||
4817 | DBG2("UST app global update for app sock %d for session id %" PRIu64, | |
4818 | app->sock, usess->id); | |
4819 | ||
4820 | if (!app->compatible) { | |
4821 | return; | |
4822 | } | |
4823 | ||
4824 | if (trace_ust_pid_tracker_lookup(usess, app->pid)) { | |
4825 | ust_app_global_create(usess, app); | |
4826 | } else { | |
4827 | ust_app_global_destroy(usess, app); | |
4828 | } | |
4829 | } | |
4830 | ||
4831 | /* | |
4832 | * Called with session lock held. | |
4833 | */ | |
4834 | void ust_app_global_update_all(struct ltt_ust_session *usess) | |
4835 | { | |
4836 | struct lttng_ht_iter iter; | |
4837 | struct ust_app *app; | |
4838 | ||
4839 | rcu_read_lock(); | |
4840 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4841 | ust_app_global_update(usess, app); | |
4842 | } | |
4843 | rcu_read_unlock(); | |
4844 | } | |
4845 | ||
55cc08a6 DG |
4846 | /* |
4847 | * Add context to a specific channel for global UST domain. | |
4848 | */ | |
4849 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
4850 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
4851 | { | |
4852 | int ret = 0; | |
bec39940 DG |
4853 | struct lttng_ht_node_str *ua_chan_node; |
4854 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
4855 | struct ust_app_channel *ua_chan = NULL; |
4856 | struct ust_app_session *ua_sess; | |
4857 | struct ust_app *app; | |
4858 | ||
4859 | rcu_read_lock(); | |
4860 | ||
852d0037 | 4861 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4862 | if (!app->compatible) { |
4863 | /* | |
4864 | * TODO: In time, we should notice the caller of this error by | |
4865 | * telling him that this is a version error. | |
4866 | */ | |
4867 | continue; | |
4868 | } | |
55cc08a6 DG |
4869 | ua_sess = lookup_session_by_app(usess, app); |
4870 | if (ua_sess == NULL) { | |
4871 | continue; | |
4872 | } | |
4873 | ||
d0b96690 | 4874 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
4875 | |
4876 | if (ua_sess->deleted) { | |
4877 | pthread_mutex_unlock(&ua_sess->lock); | |
4878 | continue; | |
4879 | } | |
4880 | ||
55cc08a6 | 4881 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4882 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4883 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 4884 | if (ua_chan_node == NULL) { |
d0b96690 | 4885 | goto next_app; |
55cc08a6 DG |
4886 | } |
4887 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
4888 | node); | |
55cc08a6 DG |
4889 | ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app); |
4890 | if (ret < 0) { | |
d0b96690 | 4891 | goto next_app; |
55cc08a6 | 4892 | } |
d0b96690 DG |
4893 | next_app: |
4894 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
4895 | } |
4896 | ||
55cc08a6 DG |
4897 | rcu_read_unlock(); |
4898 | return ret; | |
4899 | } | |
4900 | ||
76d45b40 DG |
4901 | /* |
4902 | * Enable event for a channel from a UST session for a specific PID. | |
4903 | */ | |
4904 | int ust_app_enable_event_pid(struct ltt_ust_session *usess, | |
4905 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4906 | { | |
4907 | int ret = 0; | |
bec39940 | 4908 | struct lttng_ht_iter iter; |
18eace3b | 4909 | struct lttng_ht_node_str *ua_chan_node; |
76d45b40 DG |
4910 | struct ust_app *app; |
4911 | struct ust_app_session *ua_sess; | |
4912 | struct ust_app_channel *ua_chan; | |
4913 | struct ust_app_event *ua_event; | |
4914 | ||
4915 | DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid); | |
4916 | ||
4917 | rcu_read_lock(); | |
4918 | ||
4919 | app = ust_app_find_by_pid(pid); | |
4920 | if (app == NULL) { | |
4921 | ERR("UST app enable event per PID %d not found", pid); | |
4922 | ret = -1; | |
d0b96690 | 4923 | goto end; |
76d45b40 DG |
4924 | } |
4925 | ||
e0c7ec2b DG |
4926 | if (!app->compatible) { |
4927 | ret = 0; | |
d0b96690 | 4928 | goto end; |
e0c7ec2b DG |
4929 | } |
4930 | ||
76d45b40 | 4931 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4932 | if (!ua_sess) { |
4933 | /* The application has problem or is probably dead. */ | |
d0b96690 DG |
4934 | ret = 0; |
4935 | goto end; | |
c4a1715b | 4936 | } |
76d45b40 | 4937 | |
d0b96690 | 4938 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
4939 | |
4940 | if (ua_sess->deleted) { | |
4941 | ret = 0; | |
4942 | goto end_unlock; | |
4943 | } | |
4944 | ||
76d45b40 | 4945 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4946 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4947 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
76d45b40 DG |
4948 | /* If the channel is not found, there is a code flow error */ |
4949 | assert(ua_chan_node); | |
4950 | ||
4951 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4952 | ||
18eace3b | 4953 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 4954 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 4955 | if (ua_event == NULL) { |
76d45b40 DG |
4956 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
4957 | if (ret < 0) { | |
d0b96690 | 4958 | goto end_unlock; |
76d45b40 DG |
4959 | } |
4960 | } else { | |
76d45b40 DG |
4961 | ret = enable_ust_app_event(ua_sess, ua_event, app); |
4962 | if (ret < 0) { | |
d0b96690 | 4963 | goto end_unlock; |
76d45b40 DG |
4964 | } |
4965 | } | |
4966 | ||
d0b96690 DG |
4967 | end_unlock: |
4968 | pthread_mutex_unlock(&ua_sess->lock); | |
4969 | end: | |
76d45b40 DG |
4970 | rcu_read_unlock(); |
4971 | return ret; | |
4972 | } | |
7f79d3a1 | 4973 | |
4466912f DG |
4974 | /* |
4975 | * Calibrate registered applications. | |
4976 | */ | |
4977 | int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate) | |
4978 | { | |
4979 | int ret = 0; | |
4980 | struct lttng_ht_iter iter; | |
4981 | struct ust_app *app; | |
4982 | ||
4983 | rcu_read_lock(); | |
4984 | ||
852d0037 | 4985 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4466912f DG |
4986 | if (!app->compatible) { |
4987 | /* | |
4988 | * TODO: In time, we should notice the caller of this error by | |
4989 | * telling him that this is a version error. | |
4990 | */ | |
4991 | continue; | |
4992 | } | |
4993 | ||
840cb59c | 4994 | health_code_update(); |
86acf0da | 4995 | |
fb45065e | 4996 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4997 | ret = ustctl_calibrate(app->sock, calibrate); |
fb45065e | 4998 | pthread_mutex_unlock(&app->sock_lock); |
4466912f DG |
4999 | if (ret < 0) { |
5000 | switch (ret) { | |
5001 | case -ENOSYS: | |
5002 | /* Means that it's not implemented on the tracer side. */ | |
5003 | ret = 0; | |
5004 | break; | |
5005 | default: | |
4466912f | 5006 | DBG2("Calibrate app PID %d returned with error %d", |
852d0037 | 5007 | app->pid, ret); |
4466912f DG |
5008 | break; |
5009 | } | |
5010 | } | |
5011 | } | |
5012 | ||
5013 | DBG("UST app global domain calibration finished"); | |
5014 | ||
5015 | rcu_read_unlock(); | |
5016 | ||
840cb59c | 5017 | health_code_update(); |
86acf0da | 5018 | |
4466912f DG |
5019 | return ret; |
5020 | } | |
d0b96690 DG |
5021 | |
5022 | /* | |
5023 | * Receive registration and populate the given msg structure. | |
5024 | * | |
5025 | * On success return 0 else a negative value returned by the ustctl call. | |
5026 | */ | |
5027 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
5028 | { | |
5029 | int ret; | |
5030 | uint32_t pid, ppid, uid, gid; | |
5031 | ||
5032 | assert(msg); | |
5033 | ||
5034 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
5035 | &pid, &ppid, &uid, &gid, | |
5036 | &msg->bits_per_long, | |
5037 | &msg->uint8_t_alignment, | |
5038 | &msg->uint16_t_alignment, | |
5039 | &msg->uint32_t_alignment, | |
5040 | &msg->uint64_t_alignment, | |
5041 | &msg->long_alignment, | |
5042 | &msg->byte_order, | |
5043 | msg->name); | |
5044 | if (ret < 0) { | |
5045 | switch (-ret) { | |
5046 | case EPIPE: | |
5047 | case ECONNRESET: | |
5048 | case LTTNG_UST_ERR_EXITING: | |
5049 | DBG3("UST app recv reg message failed. Application died"); | |
5050 | break; | |
5051 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
5052 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
5053 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
5054 | LTTNG_UST_ABI_MINOR_VERSION); | |
5055 | break; | |
5056 | default: | |
5057 | ERR("UST app recv reg message failed with ret %d", ret); | |
5058 | break; | |
5059 | } | |
5060 | goto error; | |
5061 | } | |
5062 | msg->pid = (pid_t) pid; | |
5063 | msg->ppid = (pid_t) ppid; | |
5064 | msg->uid = (uid_t) uid; | |
5065 | msg->gid = (gid_t) gid; | |
5066 | ||
5067 | error: | |
5068 | return ret; | |
5069 | } | |
5070 | ||
10b56aef MD |
5071 | /* |
5072 | * Return a ust app session object using the application object and the | |
5073 | * session object descriptor has a key. If not found, NULL is returned. | |
5074 | * A RCU read side lock MUST be acquired when calling this function. | |
5075 | */ | |
5076 | static struct ust_app_session *find_session_by_objd(struct ust_app *app, | |
5077 | int objd) | |
5078 | { | |
5079 | struct lttng_ht_node_ulong *node; | |
5080 | struct lttng_ht_iter iter; | |
5081 | struct ust_app_session *ua_sess = NULL; | |
5082 | ||
5083 | assert(app); | |
5084 | ||
5085 | lttng_ht_lookup(app->ust_sessions_objd, (void *)((unsigned long) objd), &iter); | |
5086 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5087 | if (node == NULL) { | |
5088 | DBG2("UST app session find by objd %d not found", objd); | |
5089 | goto error; | |
5090 | } | |
5091 | ||
5092 | ua_sess = caa_container_of(node, struct ust_app_session, ust_objd_node); | |
5093 | ||
5094 | error: | |
5095 | return ua_sess; | |
5096 | } | |
5097 | ||
d88aee68 DG |
5098 | /* |
5099 | * Return a ust app channel object using the application object and the channel | |
5100 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
5101 | * lock MUST be acquired before calling this function. | |
5102 | */ | |
d0b96690 DG |
5103 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
5104 | int objd) | |
5105 | { | |
5106 | struct lttng_ht_node_ulong *node; | |
5107 | struct lttng_ht_iter iter; | |
5108 | struct ust_app_channel *ua_chan = NULL; | |
5109 | ||
5110 | assert(app); | |
5111 | ||
5112 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
5113 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5114 | if (node == NULL) { | |
5115 | DBG2("UST app channel find by objd %d not found", objd); | |
5116 | goto error; | |
5117 | } | |
5118 | ||
5119 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
5120 | ||
5121 | error: | |
5122 | return ua_chan; | |
5123 | } | |
5124 | ||
d88aee68 DG |
5125 | /* |
5126 | * Reply to a register channel notification from an application on the notify | |
5127 | * socket. The channel metadata is also created. | |
5128 | * | |
5129 | * The session UST registry lock is acquired in this function. | |
5130 | * | |
5131 | * On success 0 is returned else a negative value. | |
5132 | */ | |
d0b96690 DG |
5133 | static int reply_ust_register_channel(int sock, int sobjd, int cobjd, |
5134 | size_t nr_fields, struct ustctl_field *fields) | |
5135 | { | |
5136 | int ret, ret_code = 0; | |
5137 | uint32_t chan_id, reg_count; | |
7972aab2 | 5138 | uint64_t chan_reg_key; |
d0b96690 DG |
5139 | enum ustctl_channel_header type; |
5140 | struct ust_app *app; | |
5141 | struct ust_app_channel *ua_chan; | |
5142 | struct ust_app_session *ua_sess; | |
7972aab2 | 5143 | struct ust_registry_session *registry; |
45893984 | 5144 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
5145 | |
5146 | rcu_read_lock(); | |
5147 | ||
5148 | /* Lookup application. If not found, there is a code flow error. */ | |
5149 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
5150 | if (!app) { |
5151 | DBG("Application socket %d is being teardown. Abort event notify", | |
5152 | sock); | |
5153 | ret = 0; | |
d5d629b5 | 5154 | free(fields); |
d88aee68 DG |
5155 | goto error_rcu_unlock; |
5156 | } | |
d0b96690 | 5157 | |
4950b860 | 5158 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 5159 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
5160 | if (!ua_chan) { |
5161 | DBG("Application channel is being teardown. Abort event notify"); | |
5162 | ret = 0; | |
d5d629b5 | 5163 | free(fields); |
4950b860 MD |
5164 | goto error_rcu_unlock; |
5165 | } | |
5166 | ||
d0b96690 DG |
5167 | assert(ua_chan->session); |
5168 | ua_sess = ua_chan->session; | |
d0b96690 | 5169 | |
7972aab2 DG |
5170 | /* Get right session registry depending on the session buffer type. */ |
5171 | registry = get_session_registry(ua_sess); | |
5172 | assert(registry); | |
45893984 | 5173 | |
7972aab2 DG |
5174 | /* Depending on the buffer type, a different channel key is used. */ |
5175 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
5176 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 5177 | } else { |
7972aab2 | 5178 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
5179 | } |
5180 | ||
7972aab2 DG |
5181 | pthread_mutex_lock(®istry->lock); |
5182 | ||
5183 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
5184 | assert(chan_reg); | |
5185 | ||
5186 | if (!chan_reg->register_done) { | |
5187 | reg_count = ust_registry_get_event_count(chan_reg); | |
5188 | if (reg_count < 31) { | |
5189 | type = USTCTL_CHANNEL_HEADER_COMPACT; | |
5190 | } else { | |
5191 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
5192 | } | |
5193 | ||
5194 | chan_reg->nr_ctx_fields = nr_fields; | |
5195 | chan_reg->ctx_fields = fields; | |
5196 | chan_reg->header_type = type; | |
d0b96690 | 5197 | } else { |
7972aab2 DG |
5198 | /* Get current already assigned values. */ |
5199 | type = chan_reg->header_type; | |
d5d629b5 DG |
5200 | free(fields); |
5201 | /* Set to NULL so the error path does not do a double free. */ | |
5202 | fields = NULL; | |
d0b96690 | 5203 | } |
7972aab2 DG |
5204 | /* Channel id is set during the object creation. */ |
5205 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
5206 | |
5207 | /* Append to metadata */ | |
7972aab2 DG |
5208 | if (!chan_reg->metadata_dumped) { |
5209 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
5210 | if (ret_code) { |
5211 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
5212 | goto reply; | |
5213 | } | |
5214 | } | |
5215 | ||
5216 | reply: | |
7972aab2 DG |
5217 | DBG3("UST app replying to register channel key %" PRIu64 |
5218 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
5219 | ret_code); | |
d0b96690 DG |
5220 | |
5221 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
5222 | if (ret < 0) { | |
5223 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5224 | ERR("UST app reply channel failed with ret %d", ret); | |
5225 | } else { | |
5226 | DBG3("UST app reply channel failed. Application died"); | |
5227 | } | |
5228 | goto error; | |
5229 | } | |
5230 | ||
7972aab2 DG |
5231 | /* This channel registry registration is completed. */ |
5232 | chan_reg->register_done = 1; | |
5233 | ||
d0b96690 | 5234 | error: |
7972aab2 | 5235 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 5236 | error_rcu_unlock: |
d0b96690 | 5237 | rcu_read_unlock(); |
d5d629b5 DG |
5238 | if (ret) { |
5239 | free(fields); | |
5240 | } | |
d0b96690 DG |
5241 | return ret; |
5242 | } | |
5243 | ||
d88aee68 DG |
5244 | /* |
5245 | * Add event to the UST channel registry. When the event is added to the | |
5246 | * registry, the metadata is also created. Once done, this replies to the | |
5247 | * application with the appropriate error code. | |
5248 | * | |
5249 | * The session UST registry lock is acquired in the function. | |
5250 | * | |
5251 | * On success 0 is returned else a negative value. | |
5252 | */ | |
d0b96690 | 5253 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
2106efa0 PP |
5254 | char *sig, size_t nr_fields, struct ustctl_field *fields, |
5255 | int loglevel_value, char *model_emf_uri) | |
d0b96690 DG |
5256 | { |
5257 | int ret, ret_code; | |
5258 | uint32_t event_id = 0; | |
7972aab2 | 5259 | uint64_t chan_reg_key; |
d0b96690 DG |
5260 | struct ust_app *app; |
5261 | struct ust_app_channel *ua_chan; | |
5262 | struct ust_app_session *ua_sess; | |
7972aab2 | 5263 | struct ust_registry_session *registry; |
d0b96690 DG |
5264 | |
5265 | rcu_read_lock(); | |
5266 | ||
5267 | /* Lookup application. If not found, there is a code flow error. */ | |
5268 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
5269 | if (!app) { |
5270 | DBG("Application socket %d is being teardown. Abort event notify", | |
5271 | sock); | |
5272 | ret = 0; | |
d5d629b5 DG |
5273 | free(sig); |
5274 | free(fields); | |
5275 | free(model_emf_uri); | |
d88aee68 DG |
5276 | goto error_rcu_unlock; |
5277 | } | |
d0b96690 | 5278 | |
4950b860 | 5279 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 5280 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
5281 | if (!ua_chan) { |
5282 | DBG("Application channel is being teardown. Abort event notify"); | |
5283 | ret = 0; | |
d5d629b5 DG |
5284 | free(sig); |
5285 | free(fields); | |
5286 | free(model_emf_uri); | |
4950b860 MD |
5287 | goto error_rcu_unlock; |
5288 | } | |
5289 | ||
d0b96690 DG |
5290 | assert(ua_chan->session); |
5291 | ua_sess = ua_chan->session; | |
5292 | ||
7972aab2 DG |
5293 | registry = get_session_registry(ua_sess); |
5294 | assert(registry); | |
5295 | ||
5296 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
5297 | chan_reg_key = ua_chan->tracing_channel_id; | |
5298 | } else { | |
5299 | chan_reg_key = ua_chan->key; | |
5300 | } | |
5301 | ||
5302 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 5303 | |
d5d629b5 DG |
5304 | /* |
5305 | * From this point on, this call acquires the ownership of the sig, fields | |
5306 | * and model_emf_uri meaning any free are done inside it if needed. These | |
5307 | * three variables MUST NOT be read/write after this. | |
5308 | */ | |
7972aab2 | 5309 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
2106efa0 PP |
5310 | sobjd, cobjd, name, sig, nr_fields, fields, |
5311 | loglevel_value, model_emf_uri, ua_sess->buffer_type, | |
5312 | &event_id, app); | |
d0b96690 DG |
5313 | |
5314 | /* | |
5315 | * The return value is returned to ustctl so in case of an error, the | |
5316 | * application can be notified. In case of an error, it's important not to | |
5317 | * return a negative error or else the application will get closed. | |
5318 | */ | |
5319 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
5320 | if (ret < 0) { | |
5321 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5322 | ERR("UST app reply event failed with ret %d", ret); | |
5323 | } else { | |
5324 | DBG3("UST app reply event failed. Application died"); | |
5325 | } | |
5326 | /* | |
5327 | * No need to wipe the create event since the application socket will | |
5328 | * get close on error hence cleaning up everything by itself. | |
5329 | */ | |
5330 | goto error; | |
5331 | } | |
5332 | ||
7972aab2 DG |
5333 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
5334 | name, event_id); | |
d88aee68 | 5335 | |
d0b96690 | 5336 | error: |
7972aab2 | 5337 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 5338 | error_rcu_unlock: |
d0b96690 DG |
5339 | rcu_read_unlock(); |
5340 | return ret; | |
5341 | } | |
5342 | ||
10b56aef MD |
5343 | /* |
5344 | * Add enum to the UST session registry. Once done, this replies to the | |
5345 | * application with the appropriate error code. | |
5346 | * | |
5347 | * The session UST registry lock is acquired within this function. | |
5348 | * | |
5349 | * On success 0 is returned else a negative value. | |
5350 | */ | |
5351 | static int add_enum_ust_registry(int sock, int sobjd, char *name, | |
5352 | struct ustctl_enum_entry *entries, size_t nr_entries) | |
5353 | { | |
5354 | int ret = 0, ret_code; | |
5355 | struct ust_app *app; | |
5356 | struct ust_app_session *ua_sess; | |
5357 | struct ust_registry_session *registry; | |
5358 | uint64_t enum_id = -1ULL; | |
5359 | ||
5360 | rcu_read_lock(); | |
5361 | ||
5362 | /* Lookup application. If not found, there is a code flow error. */ | |
5363 | app = find_app_by_notify_sock(sock); | |
5364 | if (!app) { | |
5365 | /* Return an error since this is not an error */ | |
5366 | DBG("Application socket %d is being torn down. Aborting enum registration", | |
5367 | sock); | |
5368 | free(entries); | |
5369 | goto error_rcu_unlock; | |
5370 | } | |
5371 | ||
5372 | /* Lookup session by UST object descriptor. */ | |
5373 | ua_sess = find_session_by_objd(app, sobjd); | |
5374 | if (!ua_sess) { | |
5375 | /* Return an error since this is not an error */ | |
5376 | DBG("Application session is being torn down. Aborting enum registration."); | |
5377 | free(entries); | |
5378 | goto error_rcu_unlock; | |
5379 | } | |
5380 | ||
5381 | registry = get_session_registry(ua_sess); | |
5382 | assert(registry); | |
5383 | ||
5384 | pthread_mutex_lock(®istry->lock); | |
5385 | ||
5386 | /* | |
5387 | * From this point on, the callee acquires the ownership of | |
5388 | * entries. The variable entries MUST NOT be read/written after | |
5389 | * call. | |
5390 | */ | |
5391 | ret_code = ust_registry_create_or_find_enum(registry, sobjd, name, | |
5392 | entries, nr_entries, &enum_id); | |
5393 | entries = NULL; | |
5394 | ||
5395 | /* | |
5396 | * The return value is returned to ustctl so in case of an error, the | |
5397 | * application can be notified. In case of an error, it's important not to | |
5398 | * return a negative error or else the application will get closed. | |
5399 | */ | |
5400 | ret = ustctl_reply_register_enum(sock, enum_id, ret_code); | |
5401 | if (ret < 0) { | |
5402 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5403 | ERR("UST app reply enum failed with ret %d", ret); | |
5404 | } else { | |
5405 | DBG3("UST app reply enum failed. Application died"); | |
5406 | } | |
5407 | /* | |
5408 | * No need to wipe the create enum since the application socket will | |
5409 | * get close on error hence cleaning up everything by itself. | |
5410 | */ | |
5411 | goto error; | |
5412 | } | |
5413 | ||
5414 | DBG3("UST registry enum %s added successfully or already found", name); | |
5415 | ||
5416 | error: | |
5417 | pthread_mutex_unlock(®istry->lock); | |
5418 | error_rcu_unlock: | |
5419 | rcu_read_unlock(); | |
5420 | return ret; | |
5421 | } | |
5422 | ||
d88aee68 DG |
5423 | /* |
5424 | * Handle application notification through the given notify socket. | |
5425 | * | |
5426 | * Return 0 on success or else a negative value. | |
5427 | */ | |
d0b96690 DG |
5428 | int ust_app_recv_notify(int sock) |
5429 | { | |
5430 | int ret; | |
5431 | enum ustctl_notify_cmd cmd; | |
5432 | ||
5433 | DBG3("UST app receiving notify from sock %d", sock); | |
5434 | ||
5435 | ret = ustctl_recv_notify(sock, &cmd); | |
5436 | if (ret < 0) { | |
5437 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5438 | ERR("UST app recv notify failed with ret %d", ret); | |
5439 | } else { | |
5440 | DBG3("UST app recv notify failed. Application died"); | |
5441 | } | |
5442 | goto error; | |
5443 | } | |
5444 | ||
5445 | switch (cmd) { | |
5446 | case USTCTL_NOTIFY_CMD_EVENT: | |
5447 | { | |
2106efa0 | 5448 | int sobjd, cobjd, loglevel_value; |
d0b96690 DG |
5449 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; |
5450 | size_t nr_fields; | |
5451 | struct ustctl_field *fields; | |
5452 | ||
5453 | DBG2("UST app ustctl register event received"); | |
5454 | ||
2106efa0 PP |
5455 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, |
5456 | &loglevel_value, &sig, &nr_fields, &fields, | |
5457 | &model_emf_uri); | |
d0b96690 DG |
5458 | if (ret < 0) { |
5459 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5460 | ERR("UST app recv event failed with ret %d", ret); | |
5461 | } else { | |
5462 | DBG3("UST app recv event failed. Application died"); | |
5463 | } | |
5464 | goto error; | |
5465 | } | |
5466 | ||
d5d629b5 DG |
5467 | /* |
5468 | * Add event to the UST registry coming from the notify socket. This | |
5469 | * call will free if needed the sig, fields and model_emf_uri. This | |
5470 | * code path loses the ownsership of these variables and transfer them | |
5471 | * to the this function. | |
5472 | */ | |
d0b96690 | 5473 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
2106efa0 | 5474 | fields, loglevel_value, model_emf_uri); |
d0b96690 DG |
5475 | if (ret < 0) { |
5476 | goto error; | |
5477 | } | |
5478 | ||
5479 | break; | |
5480 | } | |
5481 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
5482 | { | |
5483 | int sobjd, cobjd; | |
5484 | size_t nr_fields; | |
5485 | struct ustctl_field *fields; | |
5486 | ||
5487 | DBG2("UST app ustctl register channel received"); | |
5488 | ||
5489 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
5490 | &fields); | |
5491 | if (ret < 0) { | |
5492 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5493 | ERR("UST app recv channel failed with ret %d", ret); | |
5494 | } else { | |
5495 | DBG3("UST app recv channel failed. Application died"); | |
5496 | } | |
5497 | goto error; | |
5498 | } | |
5499 | ||
d5d629b5 DG |
5500 | /* |
5501 | * The fields ownership are transfered to this function call meaning | |
5502 | * that if needed it will be freed. After this, it's invalid to access | |
5503 | * fields or clean it up. | |
5504 | */ | |
d0b96690 DG |
5505 | ret = reply_ust_register_channel(sock, sobjd, cobjd, nr_fields, |
5506 | fields); | |
5507 | if (ret < 0) { | |
5508 | goto error; | |
5509 | } | |
5510 | ||
5511 | break; | |
5512 | } | |
10b56aef MD |
5513 | case USTCTL_NOTIFY_CMD_ENUM: |
5514 | { | |
5515 | int sobjd; | |
5516 | char name[LTTNG_UST_SYM_NAME_LEN]; | |
5517 | size_t nr_entries; | |
5518 | struct ustctl_enum_entry *entries; | |
5519 | ||
5520 | DBG2("UST app ustctl register enum received"); | |
5521 | ||
5522 | ret = ustctl_recv_register_enum(sock, &sobjd, name, | |
5523 | &entries, &nr_entries); | |
5524 | if (ret < 0) { | |
5525 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5526 | ERR("UST app recv enum failed with ret %d", ret); | |
5527 | } else { | |
5528 | DBG3("UST app recv enum failed. Application died"); | |
5529 | } | |
5530 | goto error; | |
5531 | } | |
5532 | ||
5533 | /* Callee assumes ownership of entries */ | |
5534 | ret = add_enum_ust_registry(sock, sobjd, name, | |
5535 | entries, nr_entries); | |
5536 | if (ret < 0) { | |
5537 | goto error; | |
5538 | } | |
5539 | ||
5540 | break; | |
5541 | } | |
d0b96690 DG |
5542 | default: |
5543 | /* Should NEVER happen. */ | |
5544 | assert(0); | |
5545 | } | |
5546 | ||
5547 | error: | |
5548 | return ret; | |
5549 | } | |
d88aee68 DG |
5550 | |
5551 | /* | |
5552 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
5553 | * corresponding application. On failure, the call_rcu to close the socket is | |
5554 | * executed. If an application is found, it tries to delete it from the notify | |
5555 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
5556 | * | |
5557 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
5558 | * call RCU is not done but the rest of the cleanup is. | |
5559 | */ | |
5560 | void ust_app_notify_sock_unregister(int sock) | |
5561 | { | |
5562 | int err_enomem = 0; | |
5563 | struct lttng_ht_iter iter; | |
5564 | struct ust_app *app; | |
5565 | struct ust_app_notify_sock_obj *obj; | |
5566 | ||
5567 | assert(sock >= 0); | |
5568 | ||
5569 | rcu_read_lock(); | |
5570 | ||
5571 | obj = zmalloc(sizeof(*obj)); | |
5572 | if (!obj) { | |
5573 | /* | |
5574 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
5575 | * procedure but the call_rcu will not be called. In this case, we | |
5576 | * accept the fd leak rather than possibly creating an unsynchronized | |
5577 | * state between threads. | |
5578 | * | |
5579 | * TODO: The notify object should be created once the notify socket is | |
5580 | * registered and stored independantely from the ust app object. The | |
5581 | * tricky part is to synchronize the teardown of the application and | |
5582 | * this notify object. Let's keep that in mind so we can avoid this | |
5583 | * kind of shenanigans with ENOMEM in the teardown path. | |
5584 | */ | |
5585 | err_enomem = 1; | |
5586 | } else { | |
5587 | obj->fd = sock; | |
5588 | } | |
5589 | ||
5590 | DBG("UST app notify socket unregister %d", sock); | |
5591 | ||
5592 | /* | |
5593 | * Lookup application by notify socket. If this fails, this means that the | |
5594 | * hash table delete has already been done by the application | |
5595 | * unregistration process so we can safely close the notify socket in a | |
5596 | * call RCU. | |
5597 | */ | |
5598 | app = find_app_by_notify_sock(sock); | |
5599 | if (!app) { | |
5600 | goto close_socket; | |
5601 | } | |
5602 | ||
5603 | iter.iter.node = &app->notify_sock_n.node; | |
5604 | ||
5605 | /* | |
5606 | * Whatever happens here either we fail or succeed, in both cases we have | |
5607 | * to close the socket after a grace period to continue to the call RCU | |
5608 | * here. If the deletion is successful, the application is not visible | |
5609 | * anymore by other threads and is it fails it means that it was already | |
5610 | * deleted from the hash table so either way we just have to close the | |
5611 | * socket. | |
5612 | */ | |
5613 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
5614 | ||
5615 | close_socket: | |
5616 | rcu_read_unlock(); | |
5617 | ||
5618 | /* | |
5619 | * Close socket after a grace period to avoid for the socket to be reused | |
5620 | * before the application object is freed creating potential race between | |
5621 | * threads trying to add unique in the global hash table. | |
5622 | */ | |
5623 | if (!err_enomem) { | |
5624 | call_rcu(&obj->head, close_notify_sock_rcu); | |
5625 | } | |
5626 | } | |
f45e313d DG |
5627 | |
5628 | /* | |
5629 | * Destroy a ust app data structure and free its memory. | |
5630 | */ | |
5631 | void ust_app_destroy(struct ust_app *app) | |
5632 | { | |
5633 | if (!app) { | |
5634 | return; | |
5635 | } | |
5636 | ||
5637 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
5638 | } | |
6dc3064a DG |
5639 | |
5640 | /* | |
5641 | * Take a snapshot for a given UST session. The snapshot is sent to the given | |
5642 | * output. | |
5643 | * | |
5644 | * Return 0 on success or else a negative value. | |
5645 | */ | |
5646 | int ust_app_snapshot_record(struct ltt_ust_session *usess, | |
d07ceecd MD |
5647 | struct snapshot_output *output, int wait, |
5648 | uint64_t nb_packets_per_stream) | |
6dc3064a DG |
5649 | { |
5650 | int ret = 0; | |
7badf927 | 5651 | unsigned int snapshot_done = 0; |
6dc3064a DG |
5652 | struct lttng_ht_iter iter; |
5653 | struct ust_app *app; | |
af706bb7 | 5654 | char pathname[PATH_MAX]; |
6dc3064a DG |
5655 | |
5656 | assert(usess); | |
5657 | assert(output); | |
5658 | ||
5659 | rcu_read_lock(); | |
5660 | ||
8c924c7b MD |
5661 | switch (usess->buffer_type) { |
5662 | case LTTNG_BUFFER_PER_UID: | |
5663 | { | |
5664 | struct buffer_reg_uid *reg; | |
6dc3064a | 5665 | |
8c924c7b MD |
5666 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
5667 | struct buffer_reg_channel *reg_chan; | |
5668 | struct consumer_socket *socket; | |
6dc3064a | 5669 | |
8c924c7b MD |
5670 | /* Get consumer socket to use to push the metadata.*/ |
5671 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
5672 | usess->consumer); | |
5673 | if (!socket) { | |
5674 | ret = -EINVAL; | |
5675 | goto error; | |
5676 | } | |
6dc3064a | 5677 | |
8c924c7b MD |
5678 | memset(pathname, 0, sizeof(pathname)); |
5679 | ret = snprintf(pathname, sizeof(pathname), | |
5680 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH, | |
5681 | reg->uid, reg->bits_per_long); | |
5682 | if (ret < 0) { | |
5683 | PERROR("snprintf snapshot path"); | |
5684 | goto error; | |
5685 | } | |
5686 | ||
5687 | /* Add the UST default trace dir to path. */ | |
5688 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
5689 | reg_chan, node.node) { | |
68808f4e DG |
5690 | ret = consumer_snapshot_channel(socket, reg_chan->consumer_key, |
5691 | output, 0, usess->uid, usess->gid, pathname, wait, | |
d07ceecd | 5692 | nb_packets_per_stream); |
8c924c7b MD |
5693 | if (ret < 0) { |
5694 | goto error; | |
5695 | } | |
5696 | } | |
68808f4e DG |
5697 | ret = consumer_snapshot_channel(socket, |
5698 | reg->registry->reg.ust->metadata_key, output, 1, | |
d07ceecd | 5699 | usess->uid, usess->gid, pathname, wait, 0); |
8c924c7b MD |
5700 | if (ret < 0) { |
5701 | goto error; | |
5702 | } | |
7badf927 | 5703 | snapshot_done = 1; |
af706bb7 | 5704 | } |
8c924c7b MD |
5705 | break; |
5706 | } | |
5707 | case LTTNG_BUFFER_PER_PID: | |
5708 | { | |
5709 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5710 | struct consumer_socket *socket; | |
5711 | struct lttng_ht_iter chan_iter; | |
5712 | struct ust_app_channel *ua_chan; | |
5713 | struct ust_app_session *ua_sess; | |
5714 | struct ust_registry_session *registry; | |
5715 | ||
5716 | ua_sess = lookup_session_by_app(usess, app); | |
5717 | if (!ua_sess) { | |
5718 | /* Session not associated with this app. */ | |
5719 | continue; | |
5720 | } | |
af706bb7 | 5721 | |
8c924c7b MD |
5722 | /* Get the right consumer socket for the application. */ |
5723 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
5724 | output->consumer); | |
5725 | if (!socket) { | |
5c786ded | 5726 | ret = -EINVAL; |
5c786ded JD |
5727 | goto error; |
5728 | } | |
5729 | ||
8c924c7b MD |
5730 | /* Add the UST default trace dir to path. */ |
5731 | memset(pathname, 0, sizeof(pathname)); | |
5732 | ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "/%s", | |
5733 | ua_sess->path); | |
6dc3064a | 5734 | if (ret < 0) { |
8c924c7b | 5735 | PERROR("snprintf snapshot path"); |
6dc3064a DG |
5736 | goto error; |
5737 | } | |
6dc3064a | 5738 | |
8c924c7b MD |
5739 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, |
5740 | ua_chan, node.node) { | |
68808f4e DG |
5741 | ret = consumer_snapshot_channel(socket, ua_chan->key, output, |
5742 | 0, ua_sess->euid, ua_sess->egid, pathname, wait, | |
d07ceecd | 5743 | nb_packets_per_stream); |
8c924c7b MD |
5744 | if (ret < 0) { |
5745 | goto error; | |
5746 | } | |
5747 | } | |
5748 | ||
5749 | registry = get_session_registry(ua_sess); | |
5750 | assert(registry); | |
5751 | ret = consumer_snapshot_channel(socket, registry->metadata_key, output, | |
d07ceecd | 5752 | 1, ua_sess->euid, ua_sess->egid, pathname, wait, 0); |
8c924c7b MD |
5753 | if (ret < 0) { |
5754 | goto error; | |
5755 | } | |
7badf927 | 5756 | snapshot_done = 1; |
8c924c7b MD |
5757 | } |
5758 | break; | |
5759 | } | |
5760 | default: | |
5761 | assert(0); | |
5762 | break; | |
6dc3064a DG |
5763 | } |
5764 | ||
7badf927 DG |
5765 | if (!snapshot_done) { |
5766 | /* | |
5767 | * If no snapshot was made and we are not in the error path, this means | |
5768 | * that there are no buffers thus no (prior) application to snapshot | |
5769 | * data from so we have simply NO data. | |
5770 | */ | |
5771 | ret = -ENODATA; | |
5772 | } | |
5773 | ||
6dc3064a DG |
5774 | error: |
5775 | rcu_read_unlock(); | |
5776 | return ret; | |
5777 | } | |
5c786ded JD |
5778 | |
5779 | /* | |
d07ceecd | 5780 | * Return the size taken by one more packet per stream. |
5c786ded | 5781 | */ |
d07ceecd MD |
5782 | uint64_t ust_app_get_size_one_more_packet_per_stream(struct ltt_ust_session *usess, |
5783 | uint64_t cur_nr_packets) | |
5c786ded | 5784 | { |
d07ceecd | 5785 | uint64_t tot_size = 0; |
5c786ded JD |
5786 | struct ust_app *app; |
5787 | struct lttng_ht_iter iter; | |
5788 | ||
5789 | assert(usess); | |
5790 | ||
5791 | switch (usess->buffer_type) { | |
5792 | case LTTNG_BUFFER_PER_UID: | |
5793 | { | |
5794 | struct buffer_reg_uid *reg; | |
5795 | ||
5796 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
5797 | struct buffer_reg_channel *reg_chan; | |
5798 | ||
b7064eaa | 5799 | rcu_read_lock(); |
5c786ded JD |
5800 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
5801 | reg_chan, node.node) { | |
d07ceecd MD |
5802 | if (cur_nr_packets >= reg_chan->num_subbuf) { |
5803 | /* | |
5804 | * Don't take channel into account if we | |
5805 | * already grab all its packets. | |
5806 | */ | |
5807 | continue; | |
5808 | } | |
5809 | tot_size += reg_chan->subbuf_size * reg_chan->stream_count; | |
5c786ded | 5810 | } |
b7064eaa | 5811 | rcu_read_unlock(); |
5c786ded JD |
5812 | } |
5813 | break; | |
5814 | } | |
5815 | case LTTNG_BUFFER_PER_PID: | |
5816 | { | |
5817 | rcu_read_lock(); | |
5818 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5819 | struct ust_app_channel *ua_chan; | |
5820 | struct ust_app_session *ua_sess; | |
5821 | struct lttng_ht_iter chan_iter; | |
5822 | ||
5823 | ua_sess = lookup_session_by_app(usess, app); | |
5824 | if (!ua_sess) { | |
5825 | /* Session not associated with this app. */ | |
5826 | continue; | |
5827 | } | |
5828 | ||
5829 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
5830 | ua_chan, node.node) { | |
d07ceecd MD |
5831 | if (cur_nr_packets >= ua_chan->attr.num_subbuf) { |
5832 | /* | |
5833 | * Don't take channel into account if we | |
5834 | * already grab all its packets. | |
5835 | */ | |
5836 | continue; | |
5837 | } | |
5838 | tot_size += ua_chan->attr.subbuf_size * ua_chan->streams.count; | |
5c786ded JD |
5839 | } |
5840 | } | |
5841 | rcu_read_unlock(); | |
5842 | break; | |
5843 | } | |
5844 | default: | |
5845 | assert(0); | |
5846 | break; | |
5847 | } | |
5848 | ||
d07ceecd | 5849 | return tot_size; |
5c786ded | 5850 | } |