Commit | Line | Data |
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91d76f53 DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
bdf64013 | 3 | * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
91d76f53 | 4 | * |
d14d33bf AM |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
91d76f53 DG |
8 | * |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
d14d33bf AM |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
91d76f53 DG |
17 | */ |
18 | ||
6c1c0768 | 19 | #define _LGPL_SOURCE |
91d76f53 | 20 | #include <errno.h> |
7972aab2 | 21 | #include <inttypes.h> |
91d76f53 DG |
22 | #include <pthread.h> |
23 | #include <stdio.h> | |
24 | #include <stdlib.h> | |
099e26bd | 25 | #include <string.h> |
aba8e916 DG |
26 | #include <sys/stat.h> |
27 | #include <sys/types.h> | |
099e26bd | 28 | #include <unistd.h> |
0df502fd | 29 | #include <urcu/compiler.h> |
fb54cdbf | 30 | #include <lttng/ust-error.h> |
331744e3 | 31 | #include <signal.h> |
bec39940 | 32 | |
990570ed | 33 | #include <common/common.h> |
86acf0da | 34 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 35 | |
7972aab2 | 36 | #include "buffer-registry.h" |
86acf0da | 37 | #include "fd-limit.h" |
8782cc74 | 38 | #include "health-sessiond.h" |
56fff090 | 39 | #include "ust-app.h" |
48842b30 | 40 | #include "ust-consumer.h" |
d80a6244 | 41 | #include "ust-ctl.h" |
0b2dc8df | 42 | #include "utils.h" |
fb83fe64 | 43 | #include "session.h" |
d80a6244 | 44 | |
c4b88406 MD |
45 | static |
46 | int ust_app_flush_app_session(struct ust_app *app, struct ust_app_session *ua_sess); | |
47 | ||
d9bf3ca4 MD |
48 | /* Next available channel key. Access under next_channel_key_lock. */ |
49 | static uint64_t _next_channel_key; | |
50 | static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER; | |
51 | ||
52 | /* Next available session ID. Access under next_session_id_lock. */ | |
53 | static uint64_t _next_session_id; | |
54 | static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER; | |
ffe60014 DG |
55 | |
56 | /* | |
d9bf3ca4 | 57 | * Return the incremented value of next_channel_key. |
ffe60014 | 58 | */ |
d9bf3ca4 | 59 | static uint64_t get_next_channel_key(void) |
ffe60014 | 60 | { |
d9bf3ca4 MD |
61 | uint64_t ret; |
62 | ||
63 | pthread_mutex_lock(&next_channel_key_lock); | |
64 | ret = ++_next_channel_key; | |
65 | pthread_mutex_unlock(&next_channel_key_lock); | |
66 | return ret; | |
ffe60014 DG |
67 | } |
68 | ||
69 | /* | |
7972aab2 | 70 | * Return the atomically incremented value of next_session_id. |
ffe60014 | 71 | */ |
d9bf3ca4 | 72 | static uint64_t get_next_session_id(void) |
ffe60014 | 73 | { |
d9bf3ca4 MD |
74 | uint64_t ret; |
75 | ||
76 | pthread_mutex_lock(&next_session_id_lock); | |
77 | ret = ++_next_session_id; | |
78 | pthread_mutex_unlock(&next_session_id_lock); | |
79 | return ret; | |
ffe60014 DG |
80 | } |
81 | ||
d65d2de8 DG |
82 | static void copy_channel_attr_to_ustctl( |
83 | struct ustctl_consumer_channel_attr *attr, | |
84 | struct lttng_ust_channel_attr *uattr) | |
85 | { | |
86 | /* Copy event attributes since the layout is different. */ | |
87 | attr->subbuf_size = uattr->subbuf_size; | |
88 | attr->num_subbuf = uattr->num_subbuf; | |
89 | attr->overwrite = uattr->overwrite; | |
90 | attr->switch_timer_interval = uattr->switch_timer_interval; | |
91 | attr->read_timer_interval = uattr->read_timer_interval; | |
92 | attr->output = uattr->output; | |
93 | } | |
94 | ||
025faf73 DG |
95 | /* |
96 | * Match function for the hash table lookup. | |
97 | * | |
98 | * It matches an ust app event based on three attributes which are the event | |
99 | * name, the filter bytecode and the loglevel. | |
100 | */ | |
18eace3b DG |
101 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
102 | { | |
103 | struct ust_app_event *event; | |
104 | const struct ust_app_ht_key *key; | |
2106efa0 | 105 | int ev_loglevel_value; |
18eace3b DG |
106 | |
107 | assert(node); | |
108 | assert(_key); | |
109 | ||
110 | event = caa_container_of(node, struct ust_app_event, node.node); | |
111 | key = _key; | |
2106efa0 | 112 | ev_loglevel_value = event->attr.loglevel; |
18eace3b | 113 | |
1af53eb5 | 114 | /* Match the 4 elements of the key: name, filter, loglevel, exclusions */ |
18eace3b DG |
115 | |
116 | /* Event name */ | |
117 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
118 | goto no_match; | |
119 | } | |
120 | ||
121 | /* Event loglevel. */ | |
2106efa0 | 122 | if (ev_loglevel_value != key->loglevel_type) { |
025faf73 | 123 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
2106efa0 PP |
124 | && key->loglevel_type == 0 && |
125 | ev_loglevel_value == -1) { | |
025faf73 DG |
126 | /* |
127 | * Match is accepted. This is because on event creation, the | |
128 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
129 | * -1 are accepted for this loglevel type since 0 is the one set by | |
130 | * the API when receiving an enable event. | |
131 | */ | |
132 | } else { | |
133 | goto no_match; | |
134 | } | |
18eace3b DG |
135 | } |
136 | ||
137 | /* One of the filters is NULL, fail. */ | |
138 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
139 | goto no_match; | |
140 | } | |
141 | ||
025faf73 DG |
142 | if (key->filter && event->filter) { |
143 | /* Both filters exists, check length followed by the bytecode. */ | |
144 | if (event->filter->len != key->filter->len || | |
145 | memcmp(event->filter->data, key->filter->data, | |
146 | event->filter->len) != 0) { | |
147 | goto no_match; | |
148 | } | |
18eace3b DG |
149 | } |
150 | ||
1af53eb5 JI |
151 | /* One of the exclusions is NULL, fail. */ |
152 | if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) { | |
153 | goto no_match; | |
154 | } | |
155 | ||
156 | if (key->exclusion && event->exclusion) { | |
157 | /* Both exclusions exists, check count followed by the names. */ | |
158 | if (event->exclusion->count != key->exclusion->count || | |
159 | memcmp(event->exclusion->names, key->exclusion->names, | |
160 | event->exclusion->count * LTTNG_UST_SYM_NAME_LEN) != 0) { | |
161 | goto no_match; | |
162 | } | |
163 | } | |
164 | ||
165 | ||
025faf73 | 166 | /* Match. */ |
18eace3b DG |
167 | return 1; |
168 | ||
169 | no_match: | |
170 | return 0; | |
18eace3b DG |
171 | } |
172 | ||
025faf73 DG |
173 | /* |
174 | * Unique add of an ust app event in the given ht. This uses the custom | |
175 | * ht_match_ust_app_event match function and the event name as hash. | |
176 | */ | |
d0b96690 | 177 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
178 | struct ust_app_event *event) |
179 | { | |
180 | struct cds_lfht_node *node_ptr; | |
181 | struct ust_app_ht_key key; | |
d0b96690 | 182 | struct lttng_ht *ht; |
18eace3b | 183 | |
d0b96690 DG |
184 | assert(ua_chan); |
185 | assert(ua_chan->events); | |
18eace3b DG |
186 | assert(event); |
187 | ||
d0b96690 | 188 | ht = ua_chan->events; |
18eace3b DG |
189 | key.name = event->attr.name; |
190 | key.filter = event->filter; | |
2106efa0 | 191 | key.loglevel_type = event->attr.loglevel; |
91c89f23 | 192 | key.exclusion = event->exclusion; |
18eace3b DG |
193 | |
194 | node_ptr = cds_lfht_add_unique(ht->ht, | |
195 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
196 | ht_match_ust_app_event, &key, &event->node.node); | |
197 | assert(node_ptr == &event->node.node); | |
198 | } | |
199 | ||
d88aee68 DG |
200 | /* |
201 | * Close the notify socket from the given RCU head object. This MUST be called | |
202 | * through a call_rcu(). | |
203 | */ | |
204 | static void close_notify_sock_rcu(struct rcu_head *head) | |
205 | { | |
206 | int ret; | |
207 | struct ust_app_notify_sock_obj *obj = | |
208 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
209 | ||
210 | /* Must have a valid fd here. */ | |
211 | assert(obj->fd >= 0); | |
212 | ||
213 | ret = close(obj->fd); | |
214 | if (ret) { | |
215 | ERR("close notify sock %d RCU", obj->fd); | |
216 | } | |
217 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
218 | ||
219 | free(obj); | |
220 | } | |
221 | ||
7972aab2 DG |
222 | /* |
223 | * Return the session registry according to the buffer type of the given | |
224 | * session. | |
225 | * | |
226 | * A registry per UID object MUST exists before calling this function or else | |
227 | * it assert() if not found. RCU read side lock must be acquired. | |
228 | */ | |
229 | static struct ust_registry_session *get_session_registry( | |
230 | struct ust_app_session *ua_sess) | |
231 | { | |
232 | struct ust_registry_session *registry = NULL; | |
233 | ||
234 | assert(ua_sess); | |
235 | ||
236 | switch (ua_sess->buffer_type) { | |
237 | case LTTNG_BUFFER_PER_PID: | |
238 | { | |
239 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
240 | if (!reg_pid) { | |
241 | goto error; | |
242 | } | |
243 | registry = reg_pid->registry->reg.ust; | |
244 | break; | |
245 | } | |
246 | case LTTNG_BUFFER_PER_UID: | |
247 | { | |
248 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
249 | ua_sess->tracing_id, ua_sess->bits_per_long, ua_sess->uid); | |
250 | if (!reg_uid) { | |
251 | goto error; | |
252 | } | |
253 | registry = reg_uid->registry->reg.ust; | |
254 | break; | |
255 | } | |
256 | default: | |
257 | assert(0); | |
258 | }; | |
259 | ||
260 | error: | |
261 | return registry; | |
262 | } | |
263 | ||
55cc08a6 DG |
264 | /* |
265 | * Delete ust context safely. RCU read lock must be held before calling | |
266 | * this function. | |
267 | */ | |
268 | static | |
fb45065e MD |
269 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx, |
270 | struct ust_app *app) | |
55cc08a6 | 271 | { |
ffe60014 DG |
272 | int ret; |
273 | ||
274 | assert(ua_ctx); | |
275 | ||
55cc08a6 | 276 | if (ua_ctx->obj) { |
fb45065e | 277 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 278 | ret = ustctl_release_object(sock, ua_ctx->obj); |
fb45065e | 279 | pthread_mutex_unlock(&app->sock_lock); |
d0b96690 DG |
280 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
281 | ERR("UST app sock %d release ctx obj handle %d failed with ret %d", | |
282 | sock, ua_ctx->obj->handle, ret); | |
ffe60014 | 283 | } |
55cc08a6 DG |
284 | free(ua_ctx->obj); |
285 | } | |
286 | free(ua_ctx); | |
287 | } | |
288 | ||
d80a6244 DG |
289 | /* |
290 | * Delete ust app event safely. RCU read lock must be held before calling | |
291 | * this function. | |
292 | */ | |
8b366481 | 293 | static |
fb45065e MD |
294 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event, |
295 | struct ust_app *app) | |
d80a6244 | 296 | { |
ffe60014 DG |
297 | int ret; |
298 | ||
299 | assert(ua_event); | |
300 | ||
53a80697 | 301 | free(ua_event->filter); |
951f0b71 JI |
302 | if (ua_event->exclusion != NULL) |
303 | free(ua_event->exclusion); | |
edb67388 | 304 | if (ua_event->obj != NULL) { |
fb45065e | 305 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 306 | ret = ustctl_release_object(sock, ua_event->obj); |
fb45065e | 307 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
308 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
309 | ERR("UST app sock %d release event obj failed with ret %d", | |
310 | sock, ret); | |
311 | } | |
edb67388 DG |
312 | free(ua_event->obj); |
313 | } | |
d80a6244 DG |
314 | free(ua_event); |
315 | } | |
316 | ||
317 | /* | |
7972aab2 DG |
318 | * Release ust data object of the given stream. |
319 | * | |
320 | * Return 0 on success or else a negative value. | |
d80a6244 | 321 | */ |
fb45065e MD |
322 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream, |
323 | struct ust_app *app) | |
d80a6244 | 324 | { |
7972aab2 | 325 | int ret = 0; |
ffe60014 DG |
326 | |
327 | assert(stream); | |
328 | ||
8b366481 | 329 | if (stream->obj) { |
fb45065e | 330 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 331 | ret = ustctl_release_object(sock, stream->obj); |
fb45065e | 332 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
333 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
334 | ERR("UST app sock %d release stream obj failed with ret %d", | |
335 | sock, ret); | |
336 | } | |
4063050c | 337 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
338 | free(stream->obj); |
339 | } | |
7972aab2 DG |
340 | |
341 | return ret; | |
342 | } | |
343 | ||
344 | /* | |
345 | * Delete ust app stream safely. RCU read lock must be held before calling | |
346 | * this function. | |
347 | */ | |
348 | static | |
fb45065e MD |
349 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream, |
350 | struct ust_app *app) | |
7972aab2 DG |
351 | { |
352 | assert(stream); | |
353 | ||
fb45065e | 354 | (void) release_ust_app_stream(sock, stream, app); |
84cd17c6 | 355 | free(stream); |
d80a6244 DG |
356 | } |
357 | ||
36b588ed MD |
358 | /* |
359 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
360 | * section and outside of call_rcu thread, so we postpone its execution |
361 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
362 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
363 | */ |
364 | static | |
365 | void delete_ust_app_channel_rcu(struct rcu_head *head) | |
366 | { | |
367 | struct ust_app_channel *ua_chan = | |
368 | caa_container_of(head, struct ust_app_channel, rcu_head); | |
369 | ||
0b2dc8df MD |
370 | ht_cleanup_push(ua_chan->ctx); |
371 | ht_cleanup_push(ua_chan->events); | |
36b588ed MD |
372 | free(ua_chan); |
373 | } | |
374 | ||
fb83fe64 JD |
375 | /* |
376 | * Extract the lost packet or discarded events counter when the channel is | |
377 | * being deleted and store the value in the parent channel so we can | |
378 | * access it from lttng list and at stop/destroy. | |
82cac6d2 JG |
379 | * |
380 | * The session list lock must be held by the caller. | |
fb83fe64 JD |
381 | */ |
382 | static | |
383 | void save_per_pid_lost_discarded_counters(struct ust_app_channel *ua_chan) | |
384 | { | |
385 | uint64_t discarded = 0, lost = 0; | |
386 | struct ltt_session *session; | |
387 | struct ltt_ust_channel *uchan; | |
388 | ||
389 | if (ua_chan->attr.type != LTTNG_UST_CHAN_PER_CPU) { | |
390 | return; | |
391 | } | |
392 | ||
393 | rcu_read_lock(); | |
394 | session = session_find_by_id(ua_chan->session->tracing_id); | |
d68ec974 JG |
395 | if (!session || !session->ust_session) { |
396 | /* | |
397 | * Not finding the session is not an error because there are | |
398 | * multiple ways the channels can be torn down. | |
399 | * | |
400 | * 1) The session daemon can initiate the destruction of the | |
401 | * ust app session after receiving a destroy command or | |
402 | * during its shutdown/teardown. | |
403 | * 2) The application, since we are in per-pid tracing, is | |
404 | * unregistering and tearing down its ust app session. | |
405 | * | |
406 | * Both paths are protected by the session list lock which | |
407 | * ensures that the accounting of lost packets and discarded | |
408 | * events is done exactly once. The session is then unpublished | |
409 | * from the session list, resulting in this condition. | |
410 | */ | |
fb83fe64 JD |
411 | goto end; |
412 | } | |
413 | ||
414 | if (ua_chan->attr.overwrite) { | |
415 | consumer_get_lost_packets(ua_chan->session->tracing_id, | |
416 | ua_chan->key, session->ust_session->consumer, | |
417 | &lost); | |
418 | } else { | |
419 | consumer_get_discarded_events(ua_chan->session->tracing_id, | |
420 | ua_chan->key, session->ust_session->consumer, | |
421 | &discarded); | |
422 | } | |
423 | uchan = trace_ust_find_channel_by_name( | |
424 | session->ust_session->domain_global.channels, | |
425 | ua_chan->name); | |
426 | if (!uchan) { | |
427 | ERR("Missing UST channel to store discarded counters"); | |
428 | goto end; | |
429 | } | |
430 | ||
431 | uchan->per_pid_closed_app_discarded += discarded; | |
432 | uchan->per_pid_closed_app_lost += lost; | |
433 | ||
434 | end: | |
435 | rcu_read_unlock(); | |
436 | } | |
437 | ||
d80a6244 DG |
438 | /* |
439 | * Delete ust app channel safely. RCU read lock must be held before calling | |
440 | * this function. | |
82cac6d2 JG |
441 | * |
442 | * The session list lock must be held by the caller. | |
d80a6244 | 443 | */ |
8b366481 | 444 | static |
d0b96690 DG |
445 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
446 | struct ust_app *app) | |
d80a6244 DG |
447 | { |
448 | int ret; | |
bec39940 | 449 | struct lttng_ht_iter iter; |
d80a6244 | 450 | struct ust_app_event *ua_event; |
55cc08a6 | 451 | struct ust_app_ctx *ua_ctx; |
030a66fa | 452 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 453 | struct ust_registry_session *registry; |
d80a6244 | 454 | |
ffe60014 DG |
455 | assert(ua_chan); |
456 | ||
457 | DBG3("UST app deleting channel %s", ua_chan->name); | |
458 | ||
55cc08a6 | 459 | /* Wipe stream */ |
d80a6244 | 460 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 461 | cds_list_del(&stream->list); |
fb45065e | 462 | delete_ust_app_stream(sock, stream, app); |
d80a6244 DG |
463 | } |
464 | ||
55cc08a6 | 465 | /* Wipe context */ |
bec39940 | 466 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
31746f93 | 467 | cds_list_del(&ua_ctx->list); |
bec39940 | 468 | ret = lttng_ht_del(ua_chan->ctx, &iter); |
55cc08a6 | 469 | assert(!ret); |
fb45065e | 470 | delete_ust_app_ctx(sock, ua_ctx, app); |
55cc08a6 | 471 | } |
d80a6244 | 472 | |
55cc08a6 | 473 | /* Wipe events */ |
bec39940 DG |
474 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
475 | node.node) { | |
476 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 477 | assert(!ret); |
fb45065e | 478 | delete_ust_app_event(sock, ua_event, app); |
d80a6244 | 479 | } |
edb67388 | 480 | |
c8335706 MD |
481 | if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) { |
482 | /* Wipe and free registry from session registry. */ | |
483 | registry = get_session_registry(ua_chan->session); | |
484 | if (registry) { | |
485 | ust_registry_channel_del_free(registry, ua_chan->key); | |
486 | } | |
fb83fe64 | 487 | save_per_pid_lost_discarded_counters(ua_chan); |
7972aab2 | 488 | } |
d0b96690 | 489 | |
edb67388 | 490 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
491 | /* Remove channel from application UST object descriptor. */ |
492 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
c6e62271 DG |
493 | ret = lttng_ht_del(app->ust_objd, &iter); |
494 | assert(!ret); | |
fb45065e | 495 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 496 | ret = ustctl_release_object(sock, ua_chan->obj); |
fb45065e | 497 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
498 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
499 | ERR("UST app sock %d release channel obj failed with ret %d", | |
500 | sock, ret); | |
501 | } | |
7972aab2 | 502 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
503 | free(ua_chan->obj); |
504 | } | |
36b588ed | 505 | call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); |
d80a6244 DG |
506 | } |
507 | ||
fb45065e MD |
508 | int ust_app_register_done(struct ust_app *app) |
509 | { | |
510 | int ret; | |
511 | ||
512 | pthread_mutex_lock(&app->sock_lock); | |
513 | ret = ustctl_register_done(app->sock); | |
514 | pthread_mutex_unlock(&app->sock_lock); | |
515 | return ret; | |
516 | } | |
517 | ||
518 | int ust_app_release_object(struct ust_app *app, struct lttng_ust_object_data *data) | |
519 | { | |
520 | int ret, sock; | |
521 | ||
522 | if (app) { | |
523 | pthread_mutex_lock(&app->sock_lock); | |
524 | sock = app->sock; | |
525 | } else { | |
526 | sock = -1; | |
527 | } | |
528 | ret = ustctl_release_object(sock, data); | |
529 | if (app) { | |
530 | pthread_mutex_unlock(&app->sock_lock); | |
531 | } | |
532 | return ret; | |
533 | } | |
534 | ||
331744e3 | 535 | /* |
1b532a60 DG |
536 | * Push metadata to consumer socket. |
537 | * | |
dc2bbdae MD |
538 | * RCU read-side lock must be held to guarantee existance of socket. |
539 | * Must be called with the ust app session lock held. | |
540 | * Must be called with the registry lock held. | |
331744e3 JD |
541 | * |
542 | * On success, return the len of metadata pushed or else a negative value. | |
2c57e06d MD |
543 | * Returning a -EPIPE return value means we could not send the metadata, |
544 | * but it can be caused by recoverable errors (e.g. the application has | |
545 | * terminated concurrently). | |
331744e3 JD |
546 | */ |
547 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
548 | struct consumer_socket *socket, int send_zero_data) | |
549 | { | |
550 | int ret; | |
551 | char *metadata_str = NULL; | |
c585821b | 552 | size_t len, offset, new_metadata_len_sent; |
331744e3 | 553 | ssize_t ret_val; |
c585821b | 554 | uint64_t metadata_key; |
331744e3 JD |
555 | |
556 | assert(registry); | |
557 | assert(socket); | |
1b532a60 | 558 | |
c585821b MD |
559 | metadata_key = registry->metadata_key; |
560 | ||
ce34fcd0 | 561 | /* |
dc2bbdae MD |
562 | * Means that no metadata was assigned to the session. This can |
563 | * happens if no start has been done previously. | |
ce34fcd0 | 564 | */ |
c585821b | 565 | if (!metadata_key) { |
ce34fcd0 MD |
566 | return 0; |
567 | } | |
568 | ||
1b532a60 | 569 | /* |
dc2bbdae MD |
570 | * On a push metadata error either the consumer is dead or the |
571 | * metadata channel has been destroyed because its endpoint | |
2c57e06d MD |
572 | * might have died (e.g: relayd), or because the application has |
573 | * exited. If so, the metadata closed flag is set to 1 so we | |
574 | * deny pushing metadata again which is not valid anymore on the | |
575 | * consumer side. | |
1b532a60 DG |
576 | */ |
577 | if (registry->metadata_closed) { | |
578 | return -EPIPE; | |
579 | } | |
331744e3 | 580 | |
331744e3 JD |
581 | offset = registry->metadata_len_sent; |
582 | len = registry->metadata_len - registry->metadata_len_sent; | |
c585821b | 583 | new_metadata_len_sent = registry->metadata_len; |
331744e3 JD |
584 | if (len == 0) { |
585 | DBG3("No metadata to push for metadata key %" PRIu64, | |
586 | registry->metadata_key); | |
587 | ret_val = len; | |
588 | if (send_zero_data) { | |
589 | DBG("No metadata to push"); | |
590 | goto push_data; | |
591 | } | |
592 | goto end; | |
593 | } | |
594 | ||
595 | /* Allocate only what we have to send. */ | |
596 | metadata_str = zmalloc(len); | |
597 | if (!metadata_str) { | |
598 | PERROR("zmalloc ust app metadata string"); | |
599 | ret_val = -ENOMEM; | |
600 | goto error; | |
601 | } | |
c585821b | 602 | /* Copy what we haven't sent out. */ |
331744e3 | 603 | memcpy(metadata_str, registry->metadata + offset, len); |
331744e3 JD |
604 | |
605 | push_data: | |
c585821b MD |
606 | pthread_mutex_unlock(®istry->lock); |
607 | /* | |
608 | * We need to unlock the registry while we push metadata to | |
609 | * break a circular dependency between the consumerd metadata | |
610 | * lock and the sessiond registry lock. Indeed, pushing metadata | |
611 | * to the consumerd awaits that it gets pushed all the way to | |
612 | * relayd, but doing so requires grabbing the metadata lock. If | |
613 | * a concurrent metadata request is being performed by | |
614 | * consumerd, this can try to grab the registry lock on the | |
615 | * sessiond while holding the metadata lock on the consumer | |
616 | * daemon. Those push and pull schemes are performed on two | |
617 | * different bidirectionnal communication sockets. | |
618 | */ | |
619 | ret = consumer_push_metadata(socket, metadata_key, | |
331744e3 | 620 | metadata_str, len, offset); |
c585821b | 621 | pthread_mutex_lock(®istry->lock); |
331744e3 | 622 | if (ret < 0) { |
000baf6a | 623 | /* |
dc2bbdae MD |
624 | * There is an acceptable race here between the registry |
625 | * metadata key assignment and the creation on the | |
626 | * consumer. The session daemon can concurrently push | |
627 | * metadata for this registry while being created on the | |
628 | * consumer since the metadata key of the registry is | |
629 | * assigned *before* it is setup to avoid the consumer | |
630 | * to ask for metadata that could possibly be not found | |
631 | * in the session daemon. | |
000baf6a | 632 | * |
dc2bbdae MD |
633 | * The metadata will get pushed either by the session |
634 | * being stopped or the consumer requesting metadata if | |
635 | * that race is triggered. | |
000baf6a DG |
636 | */ |
637 | if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) { | |
638 | ret = 0; | |
c585821b MD |
639 | } else { |
640 | ERR("Error pushing metadata to consumer"); | |
000baf6a | 641 | } |
331744e3 JD |
642 | ret_val = ret; |
643 | goto error_push; | |
c585821b MD |
644 | } else { |
645 | /* | |
646 | * Metadata may have been concurrently pushed, since | |
647 | * we're not holding the registry lock while pushing to | |
648 | * consumer. This is handled by the fact that we send | |
649 | * the metadata content, size, and the offset at which | |
650 | * that metadata belongs. This may arrive out of order | |
651 | * on the consumer side, and the consumer is able to | |
652 | * deal with overlapping fragments. The consumer | |
653 | * supports overlapping fragments, which must be | |
654 | * contiguous starting from offset 0. We keep the | |
655 | * largest metadata_len_sent value of the concurrent | |
656 | * send. | |
657 | */ | |
658 | registry->metadata_len_sent = | |
659 | max_t(size_t, registry->metadata_len_sent, | |
660 | new_metadata_len_sent); | |
331744e3 | 661 | } |
331744e3 JD |
662 | free(metadata_str); |
663 | return len; | |
664 | ||
665 | end: | |
666 | error: | |
ce34fcd0 MD |
667 | if (ret_val) { |
668 | /* | |
dc2bbdae MD |
669 | * On error, flag the registry that the metadata is |
670 | * closed. We were unable to push anything and this | |
671 | * means that either the consumer is not responding or | |
672 | * the metadata cache has been destroyed on the | |
673 | * consumer. | |
ce34fcd0 MD |
674 | */ |
675 | registry->metadata_closed = 1; | |
676 | } | |
331744e3 JD |
677 | error_push: |
678 | free(metadata_str); | |
679 | return ret_val; | |
680 | } | |
681 | ||
d88aee68 | 682 | /* |
ce34fcd0 | 683 | * For a given application and session, push metadata to consumer. |
331744e3 JD |
684 | * Either sock or consumer is required : if sock is NULL, the default |
685 | * socket to send the metadata is retrieved from consumer, if sock | |
686 | * is not NULL we use it to send the metadata. | |
ce34fcd0 | 687 | * RCU read-side lock must be held while calling this function, |
dc2bbdae MD |
688 | * therefore ensuring existance of registry. It also ensures existance |
689 | * of socket throughout this function. | |
d88aee68 DG |
690 | * |
691 | * Return 0 on success else a negative error. | |
2c57e06d MD |
692 | * Returning a -EPIPE return value means we could not send the metadata, |
693 | * but it can be caused by recoverable errors (e.g. the application has | |
694 | * terminated concurrently). | |
d88aee68 | 695 | */ |
7972aab2 DG |
696 | static int push_metadata(struct ust_registry_session *registry, |
697 | struct consumer_output *consumer) | |
d88aee68 | 698 | { |
331744e3 JD |
699 | int ret_val; |
700 | ssize_t ret; | |
d88aee68 DG |
701 | struct consumer_socket *socket; |
702 | ||
7972aab2 DG |
703 | assert(registry); |
704 | assert(consumer); | |
705 | ||
ce34fcd0 | 706 | pthread_mutex_lock(®istry->lock); |
ce34fcd0 | 707 | if (registry->metadata_closed) { |
dc2bbdae MD |
708 | ret_val = -EPIPE; |
709 | goto error; | |
d88aee68 DG |
710 | } |
711 | ||
d88aee68 | 712 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
713 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
714 | consumer); | |
d88aee68 | 715 | if (!socket) { |
331744e3 | 716 | ret_val = -1; |
ce34fcd0 | 717 | goto error; |
d88aee68 DG |
718 | } |
719 | ||
331744e3 | 720 | ret = ust_app_push_metadata(registry, socket, 0); |
d88aee68 | 721 | if (ret < 0) { |
331744e3 | 722 | ret_val = ret; |
ce34fcd0 | 723 | goto error; |
d88aee68 | 724 | } |
dc2bbdae | 725 | pthread_mutex_unlock(®istry->lock); |
d88aee68 DG |
726 | return 0; |
727 | ||
ce34fcd0 | 728 | error: |
dc2bbdae | 729 | pthread_mutex_unlock(®istry->lock); |
331744e3 | 730 | return ret_val; |
d88aee68 DG |
731 | } |
732 | ||
733 | /* | |
734 | * Send to the consumer a close metadata command for the given session. Once | |
735 | * done, the metadata channel is deleted and the session metadata pointer is | |
dc2bbdae | 736 | * nullified. The session lock MUST be held unless the application is |
d88aee68 DG |
737 | * in the destroy path. |
738 | * | |
739 | * Return 0 on success else a negative value. | |
740 | */ | |
7972aab2 DG |
741 | static int close_metadata(struct ust_registry_session *registry, |
742 | struct consumer_output *consumer) | |
d88aee68 DG |
743 | { |
744 | int ret; | |
745 | struct consumer_socket *socket; | |
746 | ||
7972aab2 DG |
747 | assert(registry); |
748 | assert(consumer); | |
d88aee68 | 749 | |
7972aab2 DG |
750 | rcu_read_lock(); |
751 | ||
ce34fcd0 MD |
752 | pthread_mutex_lock(®istry->lock); |
753 | ||
7972aab2 | 754 | if (!registry->metadata_key || registry->metadata_closed) { |
d88aee68 | 755 | ret = 0; |
1b532a60 | 756 | goto end; |
d88aee68 DG |
757 | } |
758 | ||
d88aee68 | 759 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
760 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
761 | consumer); | |
d88aee68 DG |
762 | if (!socket) { |
763 | ret = -1; | |
7972aab2 | 764 | goto error; |
d88aee68 DG |
765 | } |
766 | ||
7972aab2 | 767 | ret = consumer_close_metadata(socket, registry->metadata_key); |
d88aee68 | 768 | if (ret < 0) { |
7972aab2 | 769 | goto error; |
d88aee68 DG |
770 | } |
771 | ||
d88aee68 | 772 | error: |
1b532a60 DG |
773 | /* |
774 | * Metadata closed. Even on error this means that the consumer is not | |
775 | * responding or not found so either way a second close should NOT be emit | |
776 | * for this registry. | |
777 | */ | |
778 | registry->metadata_closed = 1; | |
779 | end: | |
ce34fcd0 | 780 | pthread_mutex_unlock(®istry->lock); |
7972aab2 | 781 | rcu_read_unlock(); |
d88aee68 DG |
782 | return ret; |
783 | } | |
784 | ||
36b588ed MD |
785 | /* |
786 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
787 | * section and outside of call_rcu thread, so we postpone its execution |
788 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
789 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
790 | */ |
791 | static | |
792 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
793 | { | |
794 | struct ust_app_session *ua_sess = | |
795 | caa_container_of(head, struct ust_app_session, rcu_head); | |
796 | ||
0b2dc8df | 797 | ht_cleanup_push(ua_sess->channels); |
36b588ed MD |
798 | free(ua_sess); |
799 | } | |
800 | ||
d80a6244 DG |
801 | /* |
802 | * Delete ust app session safely. RCU read lock must be held before calling | |
803 | * this function. | |
82cac6d2 JG |
804 | * |
805 | * The session list lock must be held by the caller. | |
d80a6244 | 806 | */ |
8b366481 | 807 | static |
d0b96690 DG |
808 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
809 | struct ust_app *app) | |
d80a6244 DG |
810 | { |
811 | int ret; | |
bec39940 | 812 | struct lttng_ht_iter iter; |
d80a6244 | 813 | struct ust_app_channel *ua_chan; |
7972aab2 | 814 | struct ust_registry_session *registry; |
d80a6244 | 815 | |
d88aee68 DG |
816 | assert(ua_sess); |
817 | ||
1b532a60 DG |
818 | pthread_mutex_lock(&ua_sess->lock); |
819 | ||
b161602a MD |
820 | assert(!ua_sess->deleted); |
821 | ua_sess->deleted = true; | |
822 | ||
7972aab2 | 823 | registry = get_session_registry(ua_sess); |
ce34fcd0 | 824 | if (registry) { |
d88aee68 | 825 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 826 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 827 | |
7972aab2 DG |
828 | /* |
829 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
830 | * metadata only on destroy trace session in this case. Also, the |
831 | * previous push metadata could have flag the metadata registry to | |
832 | * close so don't send a close command if closed. | |
7972aab2 | 833 | */ |
ce34fcd0 | 834 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
835 | /* And ask to close it for this session registry. */ |
836 | (void) close_metadata(registry, ua_sess->consumer); | |
837 | } | |
d80a6244 DG |
838 | } |
839 | ||
bec39940 DG |
840 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
841 | node.node) { | |
842 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 843 | assert(!ret); |
d0b96690 | 844 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 845 | } |
d80a6244 | 846 | |
7972aab2 DG |
847 | /* In case of per PID, the registry is kept in the session. */ |
848 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
849 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
850 | if (reg_pid) { | |
851 | buffer_reg_pid_remove(reg_pid); | |
852 | buffer_reg_pid_destroy(reg_pid); | |
853 | } | |
854 | } | |
d0b96690 | 855 | |
aee6bafd | 856 | if (ua_sess->handle != -1) { |
fb45065e | 857 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 858 | ret = ustctl_release_handle(sock, ua_sess->handle); |
fb45065e | 859 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
860 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
861 | ERR("UST app sock %d release session handle failed with ret %d", | |
862 | sock, ret); | |
863 | } | |
10b56aef MD |
864 | /* Remove session from application UST object descriptor. */ |
865 | iter.iter.node = &ua_sess->ust_objd_node.node; | |
866 | ret = lttng_ht_del(app->ust_sessions_objd, &iter); | |
867 | assert(!ret); | |
aee6bafd | 868 | } |
10b56aef | 869 | |
1b532a60 DG |
870 | pthread_mutex_unlock(&ua_sess->lock); |
871 | ||
6addfa37 MD |
872 | consumer_output_put(ua_sess->consumer); |
873 | ||
36b588ed | 874 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 875 | } |
91d76f53 DG |
876 | |
877 | /* | |
284d8f55 DG |
878 | * Delete a traceable application structure from the global list. Never call |
879 | * this function outside of a call_rcu call. | |
36b588ed MD |
880 | * |
881 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 882 | */ |
8b366481 DG |
883 | static |
884 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 885 | { |
8b366481 | 886 | int ret, sock; |
d42f20df | 887 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 888 | |
82cac6d2 JG |
889 | /* |
890 | * The session list lock must be held during this function to guarantee | |
891 | * the existence of ua_sess. | |
892 | */ | |
893 | session_lock_list(); | |
d80a6244 | 894 | /* Delete ust app sessions info */ |
852d0037 DG |
895 | sock = app->sock; |
896 | app->sock = -1; | |
d80a6244 | 897 | |
8b366481 | 898 | /* Wipe sessions */ |
d42f20df DG |
899 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
900 | teardown_node) { | |
901 | /* Free every object in the session and the session. */ | |
36b588ed | 902 | rcu_read_lock(); |
d0b96690 | 903 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 904 | rcu_read_unlock(); |
d80a6244 | 905 | } |
36b588ed | 906 | |
0b2dc8df | 907 | ht_cleanup_push(app->sessions); |
10b56aef | 908 | ht_cleanup_push(app->ust_sessions_objd); |
0b2dc8df | 909 | ht_cleanup_push(app->ust_objd); |
d80a6244 | 910 | |
6414a713 | 911 | /* |
852d0037 DG |
912 | * Wait until we have deleted the application from the sock hash table |
913 | * before closing this socket, otherwise an application could re-use the | |
914 | * socket ID and race with the teardown, using the same hash table entry. | |
915 | * | |
916 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
917 | * all RCU readers that could run concurrently with unregister app, | |
918 | * therefore we _need_ to only close that socket after a grace period. So | |
919 | * it should stay in this RCU callback. | |
920 | * | |
921 | * This close() is a very important step of the synchronization model so | |
922 | * every modification to this function must be carefully reviewed. | |
6414a713 | 923 | */ |
799e2c4f MD |
924 | ret = close(sock); |
925 | if (ret) { | |
926 | PERROR("close"); | |
927 | } | |
4063050c | 928 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 929 | |
852d0037 | 930 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 931 | free(app); |
82cac6d2 | 932 | session_unlock_list(); |
099e26bd DG |
933 | } |
934 | ||
935 | /* | |
f6a9efaa | 936 | * URCU intermediate call to delete an UST app. |
099e26bd | 937 | */ |
8b366481 DG |
938 | static |
939 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 940 | { |
bec39940 DG |
941 | struct lttng_ht_node_ulong *node = |
942 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 943 | struct ust_app *app = |
852d0037 | 944 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 945 | |
852d0037 | 946 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 947 | delete_ust_app(app); |
099e26bd DG |
948 | } |
949 | ||
ffe60014 DG |
950 | /* |
951 | * Delete the session from the application ht and delete the data structure by | |
952 | * freeing every object inside and releasing them. | |
82cac6d2 JG |
953 | * |
954 | * The session list lock must be held by the caller. | |
ffe60014 | 955 | */ |
d0b96690 | 956 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
957 | struct ust_app_session *ua_sess) |
958 | { | |
959 | int ret; | |
960 | struct lttng_ht_iter iter; | |
961 | ||
962 | assert(app); | |
963 | assert(ua_sess); | |
964 | ||
965 | iter.iter.node = &ua_sess->node.node; | |
966 | ret = lttng_ht_del(app->sessions, &iter); | |
967 | if (ret) { | |
968 | /* Already scheduled for teardown. */ | |
969 | goto end; | |
970 | } | |
971 | ||
972 | /* Once deleted, free the data structure. */ | |
d0b96690 | 973 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
974 | |
975 | end: | |
976 | return; | |
977 | } | |
978 | ||
8b366481 DG |
979 | /* |
980 | * Alloc new UST app session. | |
981 | */ | |
982 | static | |
d0b96690 | 983 | struct ust_app_session *alloc_ust_app_session(struct ust_app *app) |
8b366481 DG |
984 | { |
985 | struct ust_app_session *ua_sess; | |
986 | ||
987 | /* Init most of the default value by allocating and zeroing */ | |
988 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
989 | if (ua_sess == NULL) { | |
990 | PERROR("malloc"); | |
ffe60014 | 991 | goto error_free; |
8b366481 DG |
992 | } |
993 | ||
994 | ua_sess->handle = -1; | |
bec39940 | 995 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
ad7a9107 | 996 | ua_sess->metadata_attr.type = LTTNG_UST_CHAN_METADATA; |
84ad93e8 | 997 | pthread_mutex_init(&ua_sess->lock, NULL); |
ad7a9107 | 998 | |
8b366481 DG |
999 | return ua_sess; |
1000 | ||
ffe60014 | 1001 | error_free: |
8b366481 DG |
1002 | return NULL; |
1003 | } | |
1004 | ||
1005 | /* | |
1006 | * Alloc new UST app channel. | |
1007 | */ | |
1008 | static | |
1009 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 1010 | struct ust_app_session *ua_sess, |
ffe60014 | 1011 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
1012 | { |
1013 | struct ust_app_channel *ua_chan; | |
1014 | ||
1015 | /* Init most of the default value by allocating and zeroing */ | |
1016 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
1017 | if (ua_chan == NULL) { | |
1018 | PERROR("malloc"); | |
1019 | goto error; | |
1020 | } | |
1021 | ||
1022 | /* Setup channel name */ | |
1023 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
1024 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
1025 | ||
1026 | ua_chan->enabled = 1; | |
1027 | ua_chan->handle = -1; | |
45893984 | 1028 | ua_chan->session = ua_sess; |
ffe60014 | 1029 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
1030 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
1031 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
1032 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
1033 | |
1034 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
31746f93 | 1035 | CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); |
8b366481 DG |
1036 | |
1037 | /* Copy attributes */ | |
1038 | if (attr) { | |
ffe60014 | 1039 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
1040 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
1041 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
1042 | ua_chan->attr.overwrite = attr->overwrite; | |
1043 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
1044 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
1045 | ua_chan->attr.output = attr->output; | |
8b366481 | 1046 | } |
ffe60014 DG |
1047 | /* By default, the channel is a per cpu channel. */ |
1048 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
1049 | |
1050 | DBG3("UST app channel %s allocated", ua_chan->name); | |
1051 | ||
1052 | return ua_chan; | |
1053 | ||
1054 | error: | |
1055 | return NULL; | |
1056 | } | |
1057 | ||
37f1c236 DG |
1058 | /* |
1059 | * Allocate and initialize a UST app stream. | |
1060 | * | |
1061 | * Return newly allocated stream pointer or NULL on error. | |
1062 | */ | |
ffe60014 | 1063 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
1064 | { |
1065 | struct ust_app_stream *stream = NULL; | |
1066 | ||
1067 | stream = zmalloc(sizeof(*stream)); | |
1068 | if (stream == NULL) { | |
1069 | PERROR("zmalloc ust app stream"); | |
1070 | goto error; | |
1071 | } | |
1072 | ||
1073 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
1074 | stream->handle = -1; | |
1075 | ||
1076 | error: | |
1077 | return stream; | |
1078 | } | |
1079 | ||
8b366481 DG |
1080 | /* |
1081 | * Alloc new UST app event. | |
1082 | */ | |
1083 | static | |
1084 | struct ust_app_event *alloc_ust_app_event(char *name, | |
1085 | struct lttng_ust_event *attr) | |
1086 | { | |
1087 | struct ust_app_event *ua_event; | |
1088 | ||
1089 | /* Init most of the default value by allocating and zeroing */ | |
1090 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
1091 | if (ua_event == NULL) { | |
1092 | PERROR("malloc"); | |
1093 | goto error; | |
1094 | } | |
1095 | ||
1096 | ua_event->enabled = 1; | |
1097 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
1098 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 1099 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
1100 | |
1101 | /* Copy attributes */ | |
1102 | if (attr) { | |
1103 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
1104 | } | |
1105 | ||
1106 | DBG3("UST app event %s allocated", ua_event->name); | |
1107 | ||
1108 | return ua_event; | |
1109 | ||
1110 | error: | |
1111 | return NULL; | |
1112 | } | |
1113 | ||
1114 | /* | |
1115 | * Alloc new UST app context. | |
1116 | */ | |
1117 | static | |
bdf64013 | 1118 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context_attr *uctx) |
8b366481 DG |
1119 | { |
1120 | struct ust_app_ctx *ua_ctx; | |
1121 | ||
1122 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
1123 | if (ua_ctx == NULL) { | |
1124 | goto error; | |
1125 | } | |
1126 | ||
31746f93 DG |
1127 | CDS_INIT_LIST_HEAD(&ua_ctx->list); |
1128 | ||
8b366481 DG |
1129 | if (uctx) { |
1130 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
bdf64013 JG |
1131 | if (uctx->ctx == LTTNG_UST_CONTEXT_APP_CONTEXT) { |
1132 | char *provider_name = NULL, *ctx_name = NULL; | |
1133 | ||
1134 | provider_name = strdup(uctx->u.app_ctx.provider_name); | |
1135 | ctx_name = strdup(uctx->u.app_ctx.ctx_name); | |
1136 | if (!provider_name || !ctx_name) { | |
1137 | free(provider_name); | |
1138 | free(ctx_name); | |
1139 | goto error; | |
1140 | } | |
1141 | ||
1142 | ua_ctx->ctx.u.app_ctx.provider_name = provider_name; | |
1143 | ua_ctx->ctx.u.app_ctx.ctx_name = ctx_name; | |
1144 | } | |
8b366481 DG |
1145 | } |
1146 | ||
1147 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
8b366481 | 1148 | return ua_ctx; |
bdf64013 JG |
1149 | error: |
1150 | free(ua_ctx); | |
1151 | return NULL; | |
8b366481 DG |
1152 | } |
1153 | ||
025faf73 DG |
1154 | /* |
1155 | * Allocate a filter and copy the given original filter. | |
1156 | * | |
1157 | * Return allocated filter or NULL on error. | |
1158 | */ | |
51755dc8 JG |
1159 | static struct lttng_filter_bytecode *copy_filter_bytecode( |
1160 | struct lttng_filter_bytecode *orig_f) | |
025faf73 | 1161 | { |
51755dc8 | 1162 | struct lttng_filter_bytecode *filter = NULL; |
025faf73 DG |
1163 | |
1164 | /* Copy filter bytecode */ | |
1165 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
1166 | if (!filter) { | |
51755dc8 | 1167 | PERROR("zmalloc alloc filter bytecode"); |
025faf73 DG |
1168 | goto error; |
1169 | } | |
1170 | ||
1171 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
1172 | ||
1173 | error: | |
1174 | return filter; | |
1175 | } | |
1176 | ||
51755dc8 JG |
1177 | /* |
1178 | * Create a liblttng-ust filter bytecode from given bytecode. | |
1179 | * | |
1180 | * Return allocated filter or NULL on error. | |
1181 | */ | |
1182 | static struct lttng_ust_filter_bytecode *create_ust_bytecode_from_bytecode( | |
1183 | struct lttng_filter_bytecode *orig_f) | |
1184 | { | |
1185 | struct lttng_ust_filter_bytecode *filter = NULL; | |
1186 | ||
1187 | /* Copy filter bytecode */ | |
1188 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
1189 | if (!filter) { | |
1190 | PERROR("zmalloc alloc ust filter bytecode"); | |
1191 | goto error; | |
1192 | } | |
1193 | ||
1194 | assert(sizeof(struct lttng_filter_bytecode) == | |
1195 | sizeof(struct lttng_ust_filter_bytecode)); | |
1196 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
1197 | error: | |
1198 | return filter; | |
1199 | } | |
1200 | ||
099e26bd | 1201 | /* |
421cb601 DG |
1202 | * Find an ust_app using the sock and return it. RCU read side lock must be |
1203 | * held before calling this helper function. | |
099e26bd | 1204 | */ |
f20baf8e | 1205 | struct ust_app *ust_app_find_by_sock(int sock) |
099e26bd | 1206 | { |
bec39940 | 1207 | struct lttng_ht_node_ulong *node; |
bec39940 | 1208 | struct lttng_ht_iter iter; |
f6a9efaa | 1209 | |
852d0037 | 1210 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 1211 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
1212 | if (node == NULL) { |
1213 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
1214 | goto error; |
1215 | } | |
852d0037 DG |
1216 | |
1217 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
1218 | |
1219 | error: | |
1220 | return NULL; | |
099e26bd DG |
1221 | } |
1222 | ||
d0b96690 DG |
1223 | /* |
1224 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
1225 | * be held before calling this helper function. | |
1226 | */ | |
1227 | static struct ust_app *find_app_by_notify_sock(int sock) | |
1228 | { | |
1229 | struct lttng_ht_node_ulong *node; | |
1230 | struct lttng_ht_iter iter; | |
1231 | ||
1232 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
1233 | &iter); | |
1234 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1235 | if (node == NULL) { | |
1236 | DBG2("UST app find by notify sock %d not found", sock); | |
1237 | goto error; | |
1238 | } | |
1239 | ||
1240 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
1241 | ||
1242 | error: | |
1243 | return NULL; | |
1244 | } | |
1245 | ||
025faf73 DG |
1246 | /* |
1247 | * Lookup for an ust app event based on event name, filter bytecode and the | |
1248 | * event loglevel. | |
1249 | * | |
1250 | * Return an ust_app_event object or NULL on error. | |
1251 | */ | |
18eace3b | 1252 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
2106efa0 PP |
1253 | char *name, struct lttng_filter_bytecode *filter, |
1254 | int loglevel_value, | |
39c5a3a7 | 1255 | const struct lttng_event_exclusion *exclusion) |
18eace3b DG |
1256 | { |
1257 | struct lttng_ht_iter iter; | |
1258 | struct lttng_ht_node_str *node; | |
1259 | struct ust_app_event *event = NULL; | |
1260 | struct ust_app_ht_key key; | |
18eace3b DG |
1261 | |
1262 | assert(name); | |
1263 | assert(ht); | |
1264 | ||
1265 | /* Setup key for event lookup. */ | |
1266 | key.name = name; | |
1267 | key.filter = filter; | |
2106efa0 | 1268 | key.loglevel_type = loglevel_value; |
39c5a3a7 | 1269 | /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */ |
51755dc8 | 1270 | key.exclusion = exclusion; |
18eace3b | 1271 | |
025faf73 DG |
1272 | /* Lookup using the event name as hash and a custom match fct. */ |
1273 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1274 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1275 | node = lttng_ht_iter_get_node_str(&iter); |
1276 | if (node == NULL) { | |
1277 | goto end; | |
1278 | } | |
1279 | ||
1280 | event = caa_container_of(node, struct ust_app_event, node); | |
1281 | ||
1282 | end: | |
18eace3b DG |
1283 | return event; |
1284 | } | |
1285 | ||
55cc08a6 DG |
1286 | /* |
1287 | * Create the channel context on the tracer. | |
d0b96690 DG |
1288 | * |
1289 | * Called with UST app session lock held. | |
55cc08a6 DG |
1290 | */ |
1291 | static | |
1292 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1293 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1294 | { | |
1295 | int ret; | |
1296 | ||
840cb59c | 1297 | health_code_update(); |
86acf0da | 1298 | |
fb45065e | 1299 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1300 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 | 1301 | ua_chan->obj, &ua_ctx->obj); |
fb45065e | 1302 | pthread_mutex_unlock(&app->sock_lock); |
55cc08a6 | 1303 | if (ret < 0) { |
ffe60014 DG |
1304 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1305 | ERR("UST app create channel context failed for app (pid: %d) " | |
1306 | "with ret %d", app->pid, ret); | |
1307 | } else { | |
3757b385 DG |
1308 | /* |
1309 | * This is normal behavior, an application can die during the | |
1310 | * creation process. Don't report an error so the execution can | |
1311 | * continue normally. | |
1312 | */ | |
1313 | ret = 0; | |
ffe60014 DG |
1314 | DBG3("UST app disable event failed. Application is dead."); |
1315 | } | |
55cc08a6 DG |
1316 | goto error; |
1317 | } | |
1318 | ||
1319 | ua_ctx->handle = ua_ctx->obj->handle; | |
1320 | ||
d0b96690 DG |
1321 | DBG2("UST app context handle %d created successfully for channel %s", |
1322 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1323 | |
1324 | error: | |
840cb59c | 1325 | health_code_update(); |
55cc08a6 DG |
1326 | return ret; |
1327 | } | |
1328 | ||
53a80697 MD |
1329 | /* |
1330 | * Set the filter on the tracer. | |
1331 | */ | |
1332 | static | |
1333 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
1334 | struct ust_app *app) | |
1335 | { | |
1336 | int ret; | |
51755dc8 | 1337 | struct lttng_ust_filter_bytecode *ust_bytecode = NULL; |
53a80697 | 1338 | |
840cb59c | 1339 | health_code_update(); |
86acf0da | 1340 | |
53a80697 | 1341 | if (!ua_event->filter) { |
86acf0da DG |
1342 | ret = 0; |
1343 | goto error; | |
53a80697 MD |
1344 | } |
1345 | ||
51755dc8 JG |
1346 | ust_bytecode = create_ust_bytecode_from_bytecode(ua_event->filter); |
1347 | if (!ust_bytecode) { | |
1348 | ret = -LTTNG_ERR_NOMEM; | |
1349 | goto error; | |
1350 | } | |
fb45065e | 1351 | pthread_mutex_lock(&app->sock_lock); |
51755dc8 | 1352 | ret = ustctl_set_filter(app->sock, ust_bytecode, |
53a80697 | 1353 | ua_event->obj); |
fb45065e | 1354 | pthread_mutex_unlock(&app->sock_lock); |
53a80697 | 1355 | if (ret < 0) { |
ffe60014 DG |
1356 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1357 | ERR("UST app event %s filter failed for app (pid: %d) " | |
1358 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1359 | } else { | |
3757b385 DG |
1360 | /* |
1361 | * This is normal behavior, an application can die during the | |
1362 | * creation process. Don't report an error so the execution can | |
1363 | * continue normally. | |
1364 | */ | |
1365 | ret = 0; | |
ffe60014 DG |
1366 | DBG3("UST app filter event failed. Application is dead."); |
1367 | } | |
53a80697 MD |
1368 | goto error; |
1369 | } | |
1370 | ||
1371 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
1372 | ||
1373 | error: | |
840cb59c | 1374 | health_code_update(); |
51755dc8 | 1375 | free(ust_bytecode); |
53a80697 MD |
1376 | return ret; |
1377 | } | |
1378 | ||
51755dc8 JG |
1379 | static |
1380 | struct lttng_ust_event_exclusion *create_ust_exclusion_from_exclusion( | |
1381 | struct lttng_event_exclusion *exclusion) | |
1382 | { | |
1383 | struct lttng_ust_event_exclusion *ust_exclusion = NULL; | |
1384 | size_t exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) + | |
1385 | LTTNG_UST_SYM_NAME_LEN * exclusion->count; | |
1386 | ||
1387 | ust_exclusion = zmalloc(exclusion_alloc_size); | |
1388 | if (!ust_exclusion) { | |
1389 | PERROR("malloc"); | |
1390 | goto end; | |
1391 | } | |
1392 | ||
1393 | assert(sizeof(struct lttng_event_exclusion) == | |
1394 | sizeof(struct lttng_ust_event_exclusion)); | |
1395 | memcpy(ust_exclusion, exclusion, exclusion_alloc_size); | |
1396 | end: | |
1397 | return ust_exclusion; | |
1398 | } | |
1399 | ||
7cc9a73c JI |
1400 | /* |
1401 | * Set event exclusions on the tracer. | |
1402 | */ | |
1403 | static | |
1404 | int set_ust_event_exclusion(struct ust_app_event *ua_event, | |
1405 | struct ust_app *app) | |
1406 | { | |
1407 | int ret; | |
51755dc8 | 1408 | struct lttng_ust_event_exclusion *ust_exclusion = NULL; |
7cc9a73c JI |
1409 | |
1410 | health_code_update(); | |
1411 | ||
1412 | if (!ua_event->exclusion || !ua_event->exclusion->count) { | |
1413 | ret = 0; | |
1414 | goto error; | |
1415 | } | |
1416 | ||
51755dc8 JG |
1417 | ust_exclusion = create_ust_exclusion_from_exclusion( |
1418 | ua_event->exclusion); | |
1419 | if (!ust_exclusion) { | |
1420 | ret = -LTTNG_ERR_NOMEM; | |
1421 | goto error; | |
1422 | } | |
fb45065e | 1423 | pthread_mutex_lock(&app->sock_lock); |
51755dc8 | 1424 | ret = ustctl_set_exclusion(app->sock, ust_exclusion, ua_event->obj); |
fb45065e | 1425 | pthread_mutex_unlock(&app->sock_lock); |
7cc9a73c JI |
1426 | if (ret < 0) { |
1427 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1428 | ERR("UST app event %s exclusions failed for app (pid: %d) " | |
1429 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1430 | } else { | |
1431 | /* | |
1432 | * This is normal behavior, an application can die during the | |
1433 | * creation process. Don't report an error so the execution can | |
1434 | * continue normally. | |
1435 | */ | |
1436 | ret = 0; | |
1437 | DBG3("UST app event exclusion failed. Application is dead."); | |
1438 | } | |
1439 | goto error; | |
1440 | } | |
1441 | ||
1442 | DBG2("UST exclusion set successfully for event %s", ua_event->name); | |
1443 | ||
1444 | error: | |
1445 | health_code_update(); | |
51755dc8 | 1446 | free(ust_exclusion); |
7cc9a73c JI |
1447 | return ret; |
1448 | } | |
1449 | ||
9730260e DG |
1450 | /* |
1451 | * Disable the specified event on to UST tracer for the UST session. | |
1452 | */ | |
1453 | static int disable_ust_event(struct ust_app *app, | |
1454 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1455 | { | |
1456 | int ret; | |
1457 | ||
840cb59c | 1458 | health_code_update(); |
86acf0da | 1459 | |
fb45065e | 1460 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1461 | ret = ustctl_disable(app->sock, ua_event->obj); |
fb45065e | 1462 | pthread_mutex_unlock(&app->sock_lock); |
9730260e | 1463 | if (ret < 0) { |
ffe60014 DG |
1464 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1465 | ERR("UST app event %s disable failed for app (pid: %d) " | |
1466 | "and session handle %d with ret %d", | |
1467 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1468 | } else { | |
3757b385 DG |
1469 | /* |
1470 | * This is normal behavior, an application can die during the | |
1471 | * creation process. Don't report an error so the execution can | |
1472 | * continue normally. | |
1473 | */ | |
1474 | ret = 0; | |
ffe60014 DG |
1475 | DBG3("UST app disable event failed. Application is dead."); |
1476 | } | |
9730260e DG |
1477 | goto error; |
1478 | } | |
1479 | ||
1480 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 1481 | ua_event->attr.name, app->pid); |
9730260e DG |
1482 | |
1483 | error: | |
840cb59c | 1484 | health_code_update(); |
9730260e DG |
1485 | return ret; |
1486 | } | |
1487 | ||
78f0bacd DG |
1488 | /* |
1489 | * Disable the specified channel on to UST tracer for the UST session. | |
1490 | */ | |
1491 | static int disable_ust_channel(struct ust_app *app, | |
1492 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1493 | { | |
1494 | int ret; | |
1495 | ||
840cb59c | 1496 | health_code_update(); |
86acf0da | 1497 | |
fb45065e | 1498 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1499 | ret = ustctl_disable(app->sock, ua_chan->obj); |
fb45065e | 1500 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1501 | if (ret < 0) { |
ffe60014 DG |
1502 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1503 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1504 | "and session handle %d with ret %d", | |
1505 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1506 | } else { | |
3757b385 DG |
1507 | /* |
1508 | * This is normal behavior, an application can die during the | |
1509 | * creation process. Don't report an error so the execution can | |
1510 | * continue normally. | |
1511 | */ | |
1512 | ret = 0; | |
ffe60014 DG |
1513 | DBG3("UST app disable channel failed. Application is dead."); |
1514 | } | |
78f0bacd DG |
1515 | goto error; |
1516 | } | |
1517 | ||
78f0bacd | 1518 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1519 | ua_chan->name, app->pid); |
78f0bacd DG |
1520 | |
1521 | error: | |
840cb59c | 1522 | health_code_update(); |
78f0bacd DG |
1523 | return ret; |
1524 | } | |
1525 | ||
1526 | /* | |
1527 | * Enable the specified channel on to UST tracer for the UST session. | |
1528 | */ | |
1529 | static int enable_ust_channel(struct ust_app *app, | |
1530 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1531 | { | |
1532 | int ret; | |
1533 | ||
840cb59c | 1534 | health_code_update(); |
86acf0da | 1535 | |
fb45065e | 1536 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1537 | ret = ustctl_enable(app->sock, ua_chan->obj); |
fb45065e | 1538 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1539 | if (ret < 0) { |
ffe60014 DG |
1540 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1541 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1542 | "and session handle %d with ret %d", | |
1543 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1544 | } else { | |
3757b385 DG |
1545 | /* |
1546 | * This is normal behavior, an application can die during the | |
1547 | * creation process. Don't report an error so the execution can | |
1548 | * continue normally. | |
1549 | */ | |
1550 | ret = 0; | |
ffe60014 DG |
1551 | DBG3("UST app enable channel failed. Application is dead."); |
1552 | } | |
78f0bacd DG |
1553 | goto error; |
1554 | } | |
1555 | ||
1556 | ua_chan->enabled = 1; | |
1557 | ||
1558 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1559 | ua_chan->name, app->pid); |
78f0bacd DG |
1560 | |
1561 | error: | |
840cb59c | 1562 | health_code_update(); |
78f0bacd DG |
1563 | return ret; |
1564 | } | |
1565 | ||
edb67388 DG |
1566 | /* |
1567 | * Enable the specified event on to UST tracer for the UST session. | |
1568 | */ | |
1569 | static int enable_ust_event(struct ust_app *app, | |
1570 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1571 | { | |
1572 | int ret; | |
1573 | ||
840cb59c | 1574 | health_code_update(); |
86acf0da | 1575 | |
fb45065e | 1576 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1577 | ret = ustctl_enable(app->sock, ua_event->obj); |
fb45065e | 1578 | pthread_mutex_unlock(&app->sock_lock); |
edb67388 | 1579 | if (ret < 0) { |
ffe60014 DG |
1580 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1581 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1582 | "and session handle %d with ret %d", | |
1583 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1584 | } else { | |
3757b385 DG |
1585 | /* |
1586 | * This is normal behavior, an application can die during the | |
1587 | * creation process. Don't report an error so the execution can | |
1588 | * continue normally. | |
1589 | */ | |
1590 | ret = 0; | |
ffe60014 DG |
1591 | DBG3("UST app enable event failed. Application is dead."); |
1592 | } | |
edb67388 DG |
1593 | goto error; |
1594 | } | |
1595 | ||
1596 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1597 | ua_event->attr.name, app->pid); |
edb67388 DG |
1598 | |
1599 | error: | |
840cb59c | 1600 | health_code_update(); |
edb67388 DG |
1601 | return ret; |
1602 | } | |
1603 | ||
099e26bd | 1604 | /* |
7972aab2 | 1605 | * Send channel and stream buffer to application. |
4f3ab6ee | 1606 | * |
ffe60014 | 1607 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1608 | */ |
7972aab2 DG |
1609 | static int send_channel_pid_to_ust(struct ust_app *app, |
1610 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1611 | { |
1612 | int ret; | |
ffe60014 | 1613 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1614 | |
1615 | assert(app); | |
ffe60014 | 1616 | assert(ua_sess); |
4f3ab6ee | 1617 | assert(ua_chan); |
4f3ab6ee | 1618 | |
840cb59c | 1619 | health_code_update(); |
4f3ab6ee | 1620 | |
7972aab2 DG |
1621 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1622 | app->sock); | |
86acf0da | 1623 | |
ffe60014 DG |
1624 | /* Send channel to the application. */ |
1625 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
1626 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1627 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1628 | goto error; | |
1629 | } else if (ret < 0) { | |
b551a063 DG |
1630 | goto error; |
1631 | } | |
1632 | ||
d88aee68 DG |
1633 | health_code_update(); |
1634 | ||
ffe60014 DG |
1635 | /* Send all streams to application. */ |
1636 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1637 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
a7169585 MD |
1638 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1639 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1640 | goto error; | |
1641 | } else if (ret < 0) { | |
ffe60014 DG |
1642 | goto error; |
1643 | } | |
1644 | /* We don't need the stream anymore once sent to the tracer. */ | |
1645 | cds_list_del(&stream->list); | |
fb45065e | 1646 | delete_ust_app_stream(-1, stream, app); |
ffe60014 | 1647 | } |
ffe60014 DG |
1648 | /* Flag the channel that it is sent to the application. */ |
1649 | ua_chan->is_sent = 1; | |
ffe60014 | 1650 | |
b551a063 | 1651 | error: |
840cb59c | 1652 | health_code_update(); |
b551a063 DG |
1653 | return ret; |
1654 | } | |
1655 | ||
91d76f53 | 1656 | /* |
5b4a0ec0 | 1657 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1658 | * |
1659 | * Should be called with session mutex held. | |
91d76f53 | 1660 | */ |
edb67388 DG |
1661 | static |
1662 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1663 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1664 | { |
5b4a0ec0 | 1665 | int ret = 0; |
284d8f55 | 1666 | |
840cb59c | 1667 | health_code_update(); |
86acf0da | 1668 | |
5b4a0ec0 | 1669 | /* Create UST event on tracer */ |
fb45065e | 1670 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1671 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 | 1672 | &ua_event->obj); |
fb45065e | 1673 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 | 1674 | if (ret < 0) { |
ffe60014 DG |
1675 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1676 | ERR("Error ustctl create event %s for app pid: %d with ret %d", | |
1677 | ua_event->attr.name, app->pid, ret); | |
1678 | } else { | |
3757b385 DG |
1679 | /* |
1680 | * This is normal behavior, an application can die during the | |
1681 | * creation process. Don't report an error so the execution can | |
1682 | * continue normally. | |
1683 | */ | |
1684 | ret = 0; | |
ffe60014 DG |
1685 | DBG3("UST app create event failed. Application is dead."); |
1686 | } | |
5b4a0ec0 | 1687 | goto error; |
91d76f53 | 1688 | } |
f6a9efaa | 1689 | |
5b4a0ec0 | 1690 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1691 | |
5b4a0ec0 | 1692 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1693 | ua_event->attr.name, app->pid); |
f6a9efaa | 1694 | |
840cb59c | 1695 | health_code_update(); |
86acf0da | 1696 | |
025faf73 DG |
1697 | /* Set filter if one is present. */ |
1698 | if (ua_event->filter) { | |
1699 | ret = set_ust_event_filter(ua_event, app); | |
1700 | if (ret < 0) { | |
1701 | goto error; | |
1702 | } | |
1703 | } | |
1704 | ||
7cc9a73c JI |
1705 | /* Set exclusions for the event */ |
1706 | if (ua_event->exclusion) { | |
1707 | ret = set_ust_event_exclusion(ua_event, app); | |
1708 | if (ret < 0) { | |
1709 | goto error; | |
1710 | } | |
1711 | } | |
1712 | ||
8535a6d9 | 1713 | /* If event not enabled, disable it on the tracer */ |
40113787 MD |
1714 | if (ua_event->enabled) { |
1715 | /* | |
1716 | * We now need to explicitly enable the event, since it | |
1717 | * is now disabled at creation. | |
1718 | */ | |
1719 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1720 | if (ret < 0) { | |
1721 | /* | |
1722 | * If we hit an EPERM, something is wrong with our enable call. If | |
1723 | * we get an EEXIST, there is a problem on the tracer side since we | |
1724 | * just created it. | |
1725 | */ | |
1726 | switch (ret) { | |
1727 | case -LTTNG_UST_ERR_PERM: | |
1728 | /* Code flow problem */ | |
1729 | assert(0); | |
1730 | case -LTTNG_UST_ERR_EXIST: | |
1731 | /* It's OK for our use case. */ | |
1732 | ret = 0; | |
1733 | break; | |
1734 | default: | |
1735 | break; | |
1736 | } | |
1737 | goto error; | |
1738 | } | |
8535a6d9 DG |
1739 | } |
1740 | ||
5b4a0ec0 | 1741 | error: |
840cb59c | 1742 | health_code_update(); |
5b4a0ec0 | 1743 | return ret; |
91d76f53 | 1744 | } |
48842b30 | 1745 | |
5b4a0ec0 DG |
1746 | /* |
1747 | * Copy data between an UST app event and a LTT event. | |
1748 | */ | |
421cb601 | 1749 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1750 | struct ltt_ust_event *uevent) |
1751 | { | |
b4ffad32 JI |
1752 | size_t exclusion_alloc_size; |
1753 | ||
48842b30 DG |
1754 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); |
1755 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1756 | ||
fc34caaa DG |
1757 | ua_event->enabled = uevent->enabled; |
1758 | ||
5b4a0ec0 DG |
1759 | /* Copy event attributes */ |
1760 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1761 | ||
53a80697 MD |
1762 | /* Copy filter bytecode */ |
1763 | if (uevent->filter) { | |
51755dc8 | 1764 | ua_event->filter = copy_filter_bytecode(uevent->filter); |
025faf73 | 1765 | /* Filter might be NULL here in case of ENONEM. */ |
53a80697 | 1766 | } |
b4ffad32 JI |
1767 | |
1768 | /* Copy exclusion data */ | |
1769 | if (uevent->exclusion) { | |
51755dc8 | 1770 | exclusion_alloc_size = sizeof(struct lttng_event_exclusion) + |
b4ffad32 JI |
1771 | LTTNG_UST_SYM_NAME_LEN * uevent->exclusion->count; |
1772 | ua_event->exclusion = zmalloc(exclusion_alloc_size); | |
5f8df26c JI |
1773 | if (ua_event->exclusion == NULL) { |
1774 | PERROR("malloc"); | |
1775 | } else { | |
1776 | memcpy(ua_event->exclusion, uevent->exclusion, | |
1777 | exclusion_alloc_size); | |
b4ffad32 JI |
1778 | } |
1779 | } | |
48842b30 DG |
1780 | } |
1781 | ||
5b4a0ec0 DG |
1782 | /* |
1783 | * Copy data between an UST app channel and a LTT channel. | |
1784 | */ | |
421cb601 | 1785 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1786 | struct ltt_ust_channel *uchan) |
1787 | { | |
bec39940 | 1788 | struct lttng_ht_iter iter; |
48842b30 | 1789 | struct ltt_ust_event *uevent; |
55cc08a6 | 1790 | struct ltt_ust_context *uctx; |
48842b30 DG |
1791 | struct ust_app_event *ua_event; |
1792 | ||
fc34caaa | 1793 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1794 | |
1795 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1796 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 1797 | |
1624d5b7 JD |
1798 | ua_chan->tracefile_size = uchan->tracefile_size; |
1799 | ua_chan->tracefile_count = uchan->tracefile_count; | |
1800 | ||
ffe60014 DG |
1801 | /* Copy event attributes since the layout is different. */ |
1802 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1803 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1804 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1805 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1806 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
1807 | ua_chan->attr.output = uchan->attr.output; | |
1808 | /* | |
1809 | * Note that the attribute channel type is not set since the channel on the | |
1810 | * tracing registry side does not have this information. | |
1811 | */ | |
48842b30 | 1812 | |
fc34caaa | 1813 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1814 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1815 | |
31746f93 | 1816 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { |
bdf64013 JG |
1817 | struct ust_app_ctx *ua_ctx = alloc_ust_app_ctx(&uctx->ctx); |
1818 | ||
55cc08a6 DG |
1819 | if (ua_ctx == NULL) { |
1820 | continue; | |
1821 | } | |
bec39940 DG |
1822 | lttng_ht_node_init_ulong(&ua_ctx->node, |
1823 | (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 1824 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 1825 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
55cc08a6 | 1826 | } |
48842b30 | 1827 | |
421cb601 | 1828 | /* Copy all events from ltt ust channel to ust app channel */ |
bec39940 | 1829 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
18eace3b | 1830 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 1831 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 1832 | if (ua_event == NULL) { |
421cb601 | 1833 | DBG2("UST event %s not found on shadow copy channel", |
48842b30 | 1834 | uevent->attr.name); |
284d8f55 | 1835 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
48842b30 | 1836 | if (ua_event == NULL) { |
5b4a0ec0 | 1837 | continue; |
48842b30 | 1838 | } |
421cb601 | 1839 | shadow_copy_event(ua_event, uevent); |
d0b96690 | 1840 | add_unique_ust_app_event(ua_chan, ua_event); |
48842b30 | 1841 | } |
48842b30 DG |
1842 | } |
1843 | ||
fc34caaa | 1844 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1845 | } |
1846 | ||
5b4a0ec0 DG |
1847 | /* |
1848 | * Copy data between a UST app session and a regular LTT session. | |
1849 | */ | |
421cb601 | 1850 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1851 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1852 | { |
bec39940 DG |
1853 | struct lttng_ht_node_str *ua_chan_node; |
1854 | struct lttng_ht_iter iter; | |
48842b30 DG |
1855 | struct ltt_ust_channel *uchan; |
1856 | struct ust_app_channel *ua_chan; | |
477d7741 MD |
1857 | time_t rawtime; |
1858 | struct tm *timeinfo; | |
1859 | char datetime[16]; | |
1860 | int ret; | |
d7ba1388 | 1861 | char tmp_shm_path[PATH_MAX]; |
477d7741 MD |
1862 | |
1863 | /* Get date and time for unique app path */ | |
1864 | time(&rawtime); | |
1865 | timeinfo = localtime(&rawtime); | |
1866 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1867 | |
421cb601 | 1868 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1869 | |
7972aab2 DG |
1870 | ua_sess->tracing_id = usess->id; |
1871 | ua_sess->id = get_next_session_id(); | |
1872 | ua_sess->uid = app->uid; | |
1873 | ua_sess->gid = app->gid; | |
1874 | ua_sess->euid = usess->uid; | |
1875 | ua_sess->egid = usess->gid; | |
1876 | ua_sess->buffer_type = usess->buffer_type; | |
1877 | ua_sess->bits_per_long = app->bits_per_long; | |
6addfa37 | 1878 | |
7972aab2 | 1879 | /* There is only one consumer object per session possible. */ |
6addfa37 | 1880 | consumer_output_get(usess->consumer); |
7972aab2 | 1881 | ua_sess->consumer = usess->consumer; |
6addfa37 | 1882 | |
2bba9e53 | 1883 | ua_sess->output_traces = usess->output_traces; |
ecc48a90 | 1884 | ua_sess->live_timer_interval = usess->live_timer_interval; |
84ad93e8 DG |
1885 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, |
1886 | &usess->metadata_attr); | |
7972aab2 DG |
1887 | |
1888 | switch (ua_sess->buffer_type) { | |
1889 | case LTTNG_BUFFER_PER_PID: | |
1890 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 1891 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
1892 | datetime); |
1893 | break; | |
1894 | case LTTNG_BUFFER_PER_UID: | |
1895 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1896 | DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long); | |
1897 | break; | |
1898 | default: | |
1899 | assert(0); | |
1900 | goto error; | |
1901 | } | |
477d7741 MD |
1902 | if (ret < 0) { |
1903 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1904 | assert(0); |
7972aab2 | 1905 | goto error; |
477d7741 MD |
1906 | } |
1907 | ||
3d071855 MD |
1908 | strncpy(ua_sess->root_shm_path, usess->root_shm_path, |
1909 | sizeof(ua_sess->root_shm_path)); | |
1910 | ua_sess->root_shm_path[sizeof(ua_sess->root_shm_path) - 1] = '\0'; | |
d7ba1388 MD |
1911 | strncpy(ua_sess->shm_path, usess->shm_path, |
1912 | sizeof(ua_sess->shm_path)); | |
1913 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
1914 | if (ua_sess->shm_path[0]) { | |
1915 | switch (ua_sess->buffer_type) { | |
1916 | case LTTNG_BUFFER_PER_PID: | |
1917 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
1918 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", | |
1919 | app->name, app->pid, datetime); | |
1920 | break; | |
1921 | case LTTNG_BUFFER_PER_UID: | |
1922 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
1923 | DEFAULT_UST_TRACE_UID_PATH, | |
1924 | app->uid, app->bits_per_long); | |
1925 | break; | |
1926 | default: | |
1927 | assert(0); | |
1928 | goto error; | |
1929 | } | |
1930 | if (ret < 0) { | |
1931 | PERROR("sprintf UST shadow copy session"); | |
1932 | assert(0); | |
1933 | goto error; | |
1934 | } | |
1935 | strncat(ua_sess->shm_path, tmp_shm_path, | |
1936 | sizeof(ua_sess->shm_path) - strlen(ua_sess->shm_path) - 1); | |
1937 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
1938 | } | |
1939 | ||
48842b30 | 1940 | /* Iterate over all channels in global domain. */ |
bec39940 DG |
1941 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, |
1942 | uchan, node.node) { | |
1943 | struct lttng_ht_iter uiter; | |
ba767faf | 1944 | |
bec39940 DG |
1945 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
1946 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
5b4a0ec0 | 1947 | if (ua_chan_node != NULL) { |
fc34caaa | 1948 | /* Session exist. Contiuing. */ |
5b4a0ec0 DG |
1949 | continue; |
1950 | } | |
421cb601 | 1951 | |
5b4a0ec0 DG |
1952 | DBG2("Channel %s not found on shadow session copy, creating it", |
1953 | uchan->name); | |
fb83fe64 JD |
1954 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, |
1955 | &uchan->attr); | |
5b4a0ec0 | 1956 | if (ua_chan == NULL) { |
fc34caaa | 1957 | /* malloc failed FIXME: Might want to do handle ENOMEM .. */ |
5b4a0ec0 | 1958 | continue; |
48842b30 | 1959 | } |
5b4a0ec0 | 1960 | shadow_copy_channel(ua_chan, uchan); |
ffe60014 DG |
1961 | /* |
1962 | * The concept of metadata channel does not exist on the tracing | |
1963 | * registry side of the session daemon so this can only be a per CPU | |
1964 | * channel and not metadata. | |
1965 | */ | |
1966 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
1967 | ||
bec39940 | 1968 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); |
48842b30 | 1969 | } |
6addfa37 | 1970 | return; |
7972aab2 DG |
1971 | |
1972 | error: | |
6addfa37 | 1973 | consumer_output_put(ua_sess->consumer); |
48842b30 DG |
1974 | } |
1975 | ||
78f0bacd DG |
1976 | /* |
1977 | * Lookup sesison wrapper. | |
1978 | */ | |
84cd17c6 MD |
1979 | static |
1980 | void __lookup_session_by_app(struct ltt_ust_session *usess, | |
bec39940 | 1981 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1982 | { |
1983 | /* Get right UST app session from app */ | |
d9bf3ca4 | 1984 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
1985 | } |
1986 | ||
421cb601 DG |
1987 | /* |
1988 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1989 | * id. |
421cb601 | 1990 | */ |
48842b30 DG |
1991 | static struct ust_app_session *lookup_session_by_app( |
1992 | struct ltt_ust_session *usess, struct ust_app *app) | |
1993 | { | |
bec39940 | 1994 | struct lttng_ht_iter iter; |
d9bf3ca4 | 1995 | struct lttng_ht_node_u64 *node; |
48842b30 | 1996 | |
84cd17c6 | 1997 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 1998 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
1999 | if (node == NULL) { |
2000 | goto error; | |
2001 | } | |
2002 | ||
2003 | return caa_container_of(node, struct ust_app_session, node); | |
2004 | ||
2005 | error: | |
2006 | return NULL; | |
2007 | } | |
2008 | ||
7972aab2 DG |
2009 | /* |
2010 | * Setup buffer registry per PID for the given session and application. If none | |
2011 | * is found, a new one is created, added to the global registry and | |
2012 | * initialized. If regp is valid, it's set with the newly created object. | |
2013 | * | |
2014 | * Return 0 on success or else a negative value. | |
2015 | */ | |
2016 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
2017 | struct ust_app *app, struct buffer_reg_pid **regp) | |
2018 | { | |
2019 | int ret = 0; | |
2020 | struct buffer_reg_pid *reg_pid; | |
2021 | ||
2022 | assert(ua_sess); | |
2023 | assert(app); | |
2024 | ||
2025 | rcu_read_lock(); | |
2026 | ||
2027 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
2028 | if (!reg_pid) { | |
2029 | /* | |
2030 | * This is the create channel path meaning that if there is NO | |
2031 | * registry available, we have to create one for this session. | |
2032 | */ | |
d7ba1388 | 2033 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid, |
3d071855 | 2034 | ua_sess->root_shm_path, ua_sess->shm_path); |
7972aab2 DG |
2035 | if (ret < 0) { |
2036 | goto error; | |
2037 | } | |
7972aab2 DG |
2038 | } else { |
2039 | goto end; | |
2040 | } | |
2041 | ||
2042 | /* Initialize registry. */ | |
2043 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
2044 | app->bits_per_long, app->uint8_t_alignment, | |
2045 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
2046 | app->uint64_t_alignment, app->long_alignment, |
2047 | app->byte_order, app->version.major, | |
3d071855 MD |
2048 | app->version.minor, reg_pid->root_shm_path, |
2049 | reg_pid->shm_path, | |
d7ba1388 | 2050 | ua_sess->euid, ua_sess->egid); |
7972aab2 | 2051 | if (ret < 0) { |
286c991a MD |
2052 | /* |
2053 | * reg_pid->registry->reg.ust is NULL upon error, so we need to | |
2054 | * destroy the buffer registry, because it is always expected | |
2055 | * that if the buffer registry can be found, its ust registry is | |
2056 | * non-NULL. | |
2057 | */ | |
2058 | buffer_reg_pid_destroy(reg_pid); | |
7972aab2 DG |
2059 | goto error; |
2060 | } | |
2061 | ||
286c991a MD |
2062 | buffer_reg_pid_add(reg_pid); |
2063 | ||
7972aab2 DG |
2064 | DBG3("UST app buffer registry per PID created successfully"); |
2065 | ||
2066 | end: | |
2067 | if (regp) { | |
2068 | *regp = reg_pid; | |
2069 | } | |
2070 | error: | |
2071 | rcu_read_unlock(); | |
2072 | return ret; | |
2073 | } | |
2074 | ||
2075 | /* | |
2076 | * Setup buffer registry per UID for the given session and application. If none | |
2077 | * is found, a new one is created, added to the global registry and | |
2078 | * initialized. If regp is valid, it's set with the newly created object. | |
2079 | * | |
2080 | * Return 0 on success or else a negative value. | |
2081 | */ | |
2082 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
d7ba1388 | 2083 | struct ust_app_session *ua_sess, |
7972aab2 DG |
2084 | struct ust_app *app, struct buffer_reg_uid **regp) |
2085 | { | |
2086 | int ret = 0; | |
2087 | struct buffer_reg_uid *reg_uid; | |
2088 | ||
2089 | assert(usess); | |
2090 | assert(app); | |
2091 | ||
2092 | rcu_read_lock(); | |
2093 | ||
2094 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2095 | if (!reg_uid) { | |
2096 | /* | |
2097 | * This is the create channel path meaning that if there is NO | |
2098 | * registry available, we have to create one for this session. | |
2099 | */ | |
2100 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
3d071855 MD |
2101 | LTTNG_DOMAIN_UST, ®_uid, |
2102 | ua_sess->root_shm_path, ua_sess->shm_path); | |
7972aab2 DG |
2103 | if (ret < 0) { |
2104 | goto error; | |
2105 | } | |
7972aab2 DG |
2106 | } else { |
2107 | goto end; | |
2108 | } | |
2109 | ||
2110 | /* Initialize registry. */ | |
af6142cf | 2111 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
2112 | app->bits_per_long, app->uint8_t_alignment, |
2113 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
2114 | app->uint64_t_alignment, app->long_alignment, |
2115 | app->byte_order, app->version.major, | |
3d071855 MD |
2116 | app->version.minor, reg_uid->root_shm_path, |
2117 | reg_uid->shm_path, usess->uid, usess->gid); | |
7972aab2 | 2118 | if (ret < 0) { |
286c991a MD |
2119 | /* |
2120 | * reg_uid->registry->reg.ust is NULL upon error, so we need to | |
2121 | * destroy the buffer registry, because it is always expected | |
2122 | * that if the buffer registry can be found, its ust registry is | |
2123 | * non-NULL. | |
2124 | */ | |
2125 | buffer_reg_uid_destroy(reg_uid, NULL); | |
7972aab2 DG |
2126 | goto error; |
2127 | } | |
2128 | /* Add node to teardown list of the session. */ | |
2129 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
2130 | ||
286c991a | 2131 | buffer_reg_uid_add(reg_uid); |
7972aab2 | 2132 | |
286c991a | 2133 | DBG3("UST app buffer registry per UID created successfully"); |
7972aab2 DG |
2134 | end: |
2135 | if (regp) { | |
2136 | *regp = reg_uid; | |
2137 | } | |
2138 | error: | |
2139 | rcu_read_unlock(); | |
2140 | return ret; | |
2141 | } | |
2142 | ||
421cb601 | 2143 | /* |
3d8ca23b | 2144 | * Create a session on the tracer side for the given app. |
421cb601 | 2145 | * |
3d8ca23b DG |
2146 | * On success, ua_sess_ptr is populated with the session pointer or else left |
2147 | * untouched. If the session was created, is_created is set to 1. On error, | |
2148 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
2149 | * be NULL. | |
2150 | * | |
2151 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
2152 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 2153 | */ |
3d8ca23b DG |
2154 | static int create_ust_app_session(struct ltt_ust_session *usess, |
2155 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, | |
2156 | int *is_created) | |
421cb601 | 2157 | { |
3d8ca23b | 2158 | int ret, created = 0; |
421cb601 DG |
2159 | struct ust_app_session *ua_sess; |
2160 | ||
3d8ca23b DG |
2161 | assert(usess); |
2162 | assert(app); | |
2163 | assert(ua_sess_ptr); | |
2164 | ||
840cb59c | 2165 | health_code_update(); |
86acf0da | 2166 | |
421cb601 DG |
2167 | ua_sess = lookup_session_by_app(usess, app); |
2168 | if (ua_sess == NULL) { | |
d9bf3ca4 | 2169 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 2170 | app->pid, usess->id); |
d0b96690 | 2171 | ua_sess = alloc_ust_app_session(app); |
421cb601 DG |
2172 | if (ua_sess == NULL) { |
2173 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
2174 | ret = -ENOMEM; |
2175 | goto error; | |
421cb601 | 2176 | } |
477d7741 | 2177 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 2178 | created = 1; |
421cb601 DG |
2179 | } |
2180 | ||
7972aab2 DG |
2181 | switch (usess->buffer_type) { |
2182 | case LTTNG_BUFFER_PER_PID: | |
2183 | /* Init local registry. */ | |
2184 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 2185 | if (ret < 0) { |
e64207cf | 2186 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2187 | goto error; |
2188 | } | |
2189 | break; | |
2190 | case LTTNG_BUFFER_PER_UID: | |
2191 | /* Look for a global registry. If none exists, create one. */ | |
d7ba1388 | 2192 | ret = setup_buffer_reg_uid(usess, ua_sess, app, NULL); |
7972aab2 | 2193 | if (ret < 0) { |
e64207cf | 2194 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2195 | goto error; |
2196 | } | |
2197 | break; | |
2198 | default: | |
2199 | assert(0); | |
2200 | ret = -EINVAL; | |
2201 | goto error; | |
2202 | } | |
2203 | ||
2204 | health_code_update(); | |
2205 | ||
2206 | if (ua_sess->handle == -1) { | |
fb45065e | 2207 | pthread_mutex_lock(&app->sock_lock); |
7972aab2 | 2208 | ret = ustctl_create_session(app->sock); |
fb45065e | 2209 | pthread_mutex_unlock(&app->sock_lock); |
7972aab2 DG |
2210 | if (ret < 0) { |
2211 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
2212 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
2213 | app->pid, ret); |
2214 | } else { | |
2215 | DBG("UST app creating session failed. Application is dead"); | |
3757b385 DG |
2216 | /* |
2217 | * This is normal behavior, an application can die during the | |
2218 | * creation process. Don't report an error so the execution can | |
2219 | * continue normally. This will get flagged ENOTCONN and the | |
2220 | * caller will handle it. | |
2221 | */ | |
2222 | ret = 0; | |
ffe60014 | 2223 | } |
d0b96690 | 2224 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
2225 | if (ret != -ENOMEM) { |
2226 | /* | |
2227 | * Tracer is probably gone or got an internal error so let's | |
2228 | * behave like it will soon unregister or not usable. | |
2229 | */ | |
2230 | ret = -ENOTCONN; | |
2231 | } | |
2232 | goto error; | |
421cb601 DG |
2233 | } |
2234 | ||
7972aab2 DG |
2235 | ua_sess->handle = ret; |
2236 | ||
2237 | /* Add ust app session to app's HT */ | |
d9bf3ca4 MD |
2238 | lttng_ht_node_init_u64(&ua_sess->node, |
2239 | ua_sess->tracing_id); | |
2240 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
10b56aef MD |
2241 | lttng_ht_node_init_ulong(&ua_sess->ust_objd_node, ua_sess->handle); |
2242 | lttng_ht_add_unique_ulong(app->ust_sessions_objd, | |
2243 | &ua_sess->ust_objd_node); | |
7972aab2 DG |
2244 | |
2245 | DBG2("UST app session created successfully with handle %d", ret); | |
2246 | } | |
2247 | ||
2248 | *ua_sess_ptr = ua_sess; | |
2249 | if (is_created) { | |
2250 | *is_created = created; | |
2251 | } | |
2252 | ||
2253 | /* Everything went well. */ | |
2254 | ret = 0; | |
2255 | ||
2256 | error: | |
2257 | health_code_update(); | |
2258 | return ret; | |
2259 | } | |
2260 | ||
6a6b2068 JG |
2261 | /* |
2262 | * Match function for a hash table lookup of ust_app_ctx. | |
2263 | * | |
2264 | * It matches an ust app context based on the context type and, in the case | |
2265 | * of perf counters, their name. | |
2266 | */ | |
2267 | static int ht_match_ust_app_ctx(struct cds_lfht_node *node, const void *_key) | |
2268 | { | |
2269 | struct ust_app_ctx *ctx; | |
bdf64013 | 2270 | const struct lttng_ust_context_attr *key; |
6a6b2068 JG |
2271 | |
2272 | assert(node); | |
2273 | assert(_key); | |
2274 | ||
2275 | ctx = caa_container_of(node, struct ust_app_ctx, node.node); | |
2276 | key = _key; | |
2277 | ||
2278 | /* Context type */ | |
2279 | if (ctx->ctx.ctx != key->ctx) { | |
2280 | goto no_match; | |
2281 | } | |
2282 | ||
bdf64013 JG |
2283 | switch(key->ctx) { |
2284 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: | |
6a6b2068 | 2285 | if (strncmp(key->u.perf_counter.name, |
bdf64013 JG |
2286 | ctx->ctx.u.perf_counter.name, |
2287 | sizeof(key->u.perf_counter.name))) { | |
2288 | goto no_match; | |
2289 | } | |
2290 | break; | |
2291 | case LTTNG_UST_CONTEXT_APP_CONTEXT: | |
2292 | if (strcmp(key->u.app_ctx.provider_name, | |
2293 | ctx->ctx.u.app_ctx.provider_name) || | |
2294 | strcmp(key->u.app_ctx.ctx_name, | |
2295 | ctx->ctx.u.app_ctx.ctx_name)) { | |
6a6b2068 JG |
2296 | goto no_match; |
2297 | } | |
bdf64013 JG |
2298 | break; |
2299 | default: | |
2300 | break; | |
6a6b2068 JG |
2301 | } |
2302 | ||
2303 | /* Match. */ | |
2304 | return 1; | |
2305 | ||
2306 | no_match: | |
2307 | return 0; | |
2308 | } | |
2309 | ||
2310 | /* | |
2311 | * Lookup for an ust app context from an lttng_ust_context. | |
2312 | * | |
be184a0f | 2313 | * Must be called while holding RCU read side lock. |
6a6b2068 JG |
2314 | * Return an ust_app_ctx object or NULL on error. |
2315 | */ | |
2316 | static | |
2317 | struct ust_app_ctx *find_ust_app_context(struct lttng_ht *ht, | |
bdf64013 | 2318 | struct lttng_ust_context_attr *uctx) |
6a6b2068 JG |
2319 | { |
2320 | struct lttng_ht_iter iter; | |
2321 | struct lttng_ht_node_ulong *node; | |
2322 | struct ust_app_ctx *app_ctx = NULL; | |
2323 | ||
2324 | assert(uctx); | |
2325 | assert(ht); | |
2326 | ||
2327 | /* Lookup using the lttng_ust_context_type and a custom match fct. */ | |
2328 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) uctx->ctx, lttng_ht_seed), | |
2329 | ht_match_ust_app_ctx, uctx, &iter.iter); | |
2330 | node = lttng_ht_iter_get_node_ulong(&iter); | |
2331 | if (!node) { | |
2332 | goto end; | |
2333 | } | |
2334 | ||
2335 | app_ctx = caa_container_of(node, struct ust_app_ctx, node); | |
2336 | ||
2337 | end: | |
2338 | return app_ctx; | |
2339 | } | |
2340 | ||
7972aab2 DG |
2341 | /* |
2342 | * Create a context for the channel on the tracer. | |
2343 | * | |
2344 | * Called with UST app session lock held and a RCU read side lock. | |
2345 | */ | |
2346 | static | |
2347 | int create_ust_app_channel_context(struct ust_app_session *ua_sess, | |
bdf64013 JG |
2348 | struct ust_app_channel *ua_chan, |
2349 | struct lttng_ust_context_attr *uctx, | |
7972aab2 DG |
2350 | struct ust_app *app) |
2351 | { | |
2352 | int ret = 0; | |
7972aab2 DG |
2353 | struct ust_app_ctx *ua_ctx; |
2354 | ||
2355 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
2356 | ||
6a6b2068 JG |
2357 | ua_ctx = find_ust_app_context(ua_chan->ctx, uctx); |
2358 | if (ua_ctx) { | |
7972aab2 DG |
2359 | ret = -EEXIST; |
2360 | goto error; | |
2361 | } | |
2362 | ||
2363 | ua_ctx = alloc_ust_app_ctx(uctx); | |
2364 | if (ua_ctx == NULL) { | |
2365 | /* malloc failed */ | |
2366 | ret = -1; | |
2367 | goto error; | |
2368 | } | |
2369 | ||
2370 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 2371 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 2372 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
2373 | |
2374 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
2375 | if (ret < 0) { | |
2376 | goto error; | |
2377 | } | |
2378 | ||
2379 | error: | |
2380 | return ret; | |
2381 | } | |
2382 | ||
2383 | /* | |
2384 | * Enable on the tracer side a ust app event for the session and channel. | |
2385 | * | |
2386 | * Called with UST app session lock held. | |
2387 | */ | |
2388 | static | |
2389 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
2390 | struct ust_app_event *ua_event, struct ust_app *app) | |
2391 | { | |
2392 | int ret; | |
2393 | ||
2394 | ret = enable_ust_event(app, ua_sess, ua_event); | |
2395 | if (ret < 0) { | |
2396 | goto error; | |
2397 | } | |
2398 | ||
2399 | ua_event->enabled = 1; | |
2400 | ||
2401 | error: | |
2402 | return ret; | |
2403 | } | |
2404 | ||
2405 | /* | |
2406 | * Disable on the tracer side a ust app event for the session and channel. | |
2407 | */ | |
2408 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
2409 | struct ust_app_event *ua_event, struct ust_app *app) | |
2410 | { | |
2411 | int ret; | |
2412 | ||
2413 | ret = disable_ust_event(app, ua_sess, ua_event); | |
2414 | if (ret < 0) { | |
2415 | goto error; | |
2416 | } | |
2417 | ||
2418 | ua_event->enabled = 0; | |
2419 | ||
2420 | error: | |
2421 | return ret; | |
2422 | } | |
2423 | ||
2424 | /* | |
2425 | * Lookup ust app channel for session and disable it on the tracer side. | |
2426 | */ | |
2427 | static | |
2428 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
2429 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
2430 | { | |
2431 | int ret; | |
2432 | ||
2433 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2434 | if (ret < 0) { | |
2435 | goto error; | |
2436 | } | |
2437 | ||
2438 | ua_chan->enabled = 0; | |
2439 | ||
2440 | error: | |
2441 | return ret; | |
2442 | } | |
2443 | ||
2444 | /* | |
2445 | * Lookup ust app channel for session and enable it on the tracer side. This | |
2446 | * MUST be called with a RCU read side lock acquired. | |
2447 | */ | |
2448 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
2449 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
2450 | { | |
2451 | int ret = 0; | |
2452 | struct lttng_ht_iter iter; | |
2453 | struct lttng_ht_node_str *ua_chan_node; | |
2454 | struct ust_app_channel *ua_chan; | |
2455 | ||
2456 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
2457 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
2458 | if (ua_chan_node == NULL) { | |
d9bf3ca4 | 2459 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
2460 | uchan->name, ua_sess->tracing_id); |
2461 | goto error; | |
2462 | } | |
2463 | ||
2464 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2465 | ||
2466 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
2467 | if (ret < 0) { | |
2468 | goto error; | |
2469 | } | |
2470 | ||
2471 | error: | |
2472 | return ret; | |
2473 | } | |
2474 | ||
2475 | /* | |
2476 | * Ask the consumer to create a channel and get it if successful. | |
2477 | * | |
2478 | * Return 0 on success or else a negative value. | |
2479 | */ | |
2480 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
2481 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
2482 | int bitness, struct ust_registry_session *registry) | |
2483 | { | |
2484 | int ret; | |
2485 | unsigned int nb_fd = 0; | |
2486 | struct consumer_socket *socket; | |
2487 | ||
2488 | assert(usess); | |
2489 | assert(ua_sess); | |
2490 | assert(ua_chan); | |
2491 | assert(registry); | |
2492 | ||
2493 | rcu_read_lock(); | |
2494 | health_code_update(); | |
2495 | ||
2496 | /* Get the right consumer socket for the application. */ | |
2497 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
2498 | if (!socket) { | |
2499 | ret = -EINVAL; | |
2500 | goto error; | |
2501 | } | |
2502 | ||
2503 | health_code_update(); | |
2504 | ||
2505 | /* Need one fd for the channel. */ | |
2506 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2507 | if (ret < 0) { | |
2508 | ERR("Exhausted number of available FD upon create channel"); | |
2509 | goto error; | |
2510 | } | |
2511 | ||
2512 | /* | |
2513 | * Ask consumer to create channel. The consumer will return the number of | |
2514 | * stream we have to expect. | |
2515 | */ | |
2516 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
2517 | registry); | |
2518 | if (ret < 0) { | |
2519 | goto error_ask; | |
2520 | } | |
2521 | ||
2522 | /* | |
2523 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2524 | * stream (2 being the default value here). | |
2525 | */ | |
2526 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2527 | ||
2528 | /* Reserve the amount of file descriptor we need. */ | |
2529 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2530 | if (ret < 0) { | |
2531 | ERR("Exhausted number of available FD upon create channel"); | |
2532 | goto error_fd_get_stream; | |
2533 | } | |
2534 | ||
2535 | health_code_update(); | |
2536 | ||
2537 | /* | |
2538 | * Now get the channel from the consumer. This call wil populate the stream | |
2539 | * list of that channel and set the ust objects. | |
2540 | */ | |
d9078d0c DG |
2541 | if (usess->consumer->enabled) { |
2542 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2543 | if (ret < 0) { | |
2544 | goto error_destroy; | |
2545 | } | |
7972aab2 DG |
2546 | } |
2547 | ||
2548 | rcu_read_unlock(); | |
2549 | return 0; | |
2550 | ||
2551 | error_destroy: | |
2552 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2553 | error_fd_get_stream: | |
2554 | /* | |
2555 | * Initiate a destroy channel on the consumer since we had an error | |
2556 | * handling it on our side. The return value is of no importance since we | |
2557 | * already have a ret value set by the previous error that we need to | |
2558 | * return. | |
2559 | */ | |
2560 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2561 | error_ask: | |
2562 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2563 | error: | |
2564 | health_code_update(); | |
2565 | rcu_read_unlock(); | |
2566 | return ret; | |
2567 | } | |
2568 | ||
2569 | /* | |
2570 | * Duplicate the ust data object of the ust app stream and save it in the | |
2571 | * buffer registry stream. | |
2572 | * | |
2573 | * Return 0 on success or else a negative value. | |
2574 | */ | |
2575 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2576 | struct ust_app_stream *stream) | |
2577 | { | |
2578 | int ret; | |
2579 | ||
2580 | assert(reg_stream); | |
2581 | assert(stream); | |
2582 | ||
2583 | /* Reserve the amount of file descriptor we need. */ | |
2584 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2585 | if (ret < 0) { | |
2586 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2587 | goto error; | |
2588 | } | |
2589 | ||
2590 | /* Duplicate object for stream once the original is in the registry. */ | |
2591 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2592 | reg_stream->obj.ust); | |
2593 | if (ret < 0) { | |
2594 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2595 | reg_stream->obj.ust, stream->obj, ret); | |
2596 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2597 | goto error; | |
2598 | } | |
2599 | stream->handle = stream->obj->handle; | |
2600 | ||
2601 | error: | |
2602 | return ret; | |
2603 | } | |
2604 | ||
2605 | /* | |
2606 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2607 | * buffer registry channel. | |
2608 | * | |
2609 | * Return 0 on success or else a negative value. | |
2610 | */ | |
2611 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2612 | struct ust_app_channel *ua_chan) | |
2613 | { | |
2614 | int ret; | |
2615 | ||
2616 | assert(reg_chan); | |
2617 | assert(ua_chan); | |
2618 | ||
2619 | /* Need two fds for the channel. */ | |
2620 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2621 | if (ret < 0) { | |
2622 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2623 | goto error_fd_get; | |
2624 | } | |
2625 | ||
2626 | /* Duplicate object for stream once the original is in the registry. */ | |
2627 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2628 | if (ret < 0) { | |
2629 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2630 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2631 | goto error; | |
2632 | } | |
2633 | ua_chan->handle = ua_chan->obj->handle; | |
2634 | ||
2635 | return 0; | |
2636 | ||
2637 | error: | |
2638 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2639 | error_fd_get: | |
2640 | return ret; | |
2641 | } | |
2642 | ||
2643 | /* | |
2644 | * For a given channel buffer registry, setup all streams of the given ust | |
2645 | * application channel. | |
2646 | * | |
2647 | * Return 0 on success or else a negative value. | |
2648 | */ | |
2649 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
fb45065e MD |
2650 | struct ust_app_channel *ua_chan, |
2651 | struct ust_app *app) | |
7972aab2 DG |
2652 | { |
2653 | int ret = 0; | |
2654 | struct ust_app_stream *stream, *stmp; | |
2655 | ||
2656 | assert(reg_chan); | |
2657 | assert(ua_chan); | |
2658 | ||
2659 | DBG2("UST app setup buffer registry stream"); | |
2660 | ||
2661 | /* Send all streams to application. */ | |
2662 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2663 | struct buffer_reg_stream *reg_stream; | |
2664 | ||
2665 | ret = buffer_reg_stream_create(®_stream); | |
2666 | if (ret < 0) { | |
2667 | goto error; | |
2668 | } | |
2669 | ||
2670 | /* | |
2671 | * Keep original pointer and nullify it in the stream so the delete | |
2672 | * stream call does not release the object. | |
2673 | */ | |
2674 | reg_stream->obj.ust = stream->obj; | |
2675 | stream->obj = NULL; | |
2676 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2677 | |
7972aab2 DG |
2678 | /* We don't need the streams anymore. */ |
2679 | cds_list_del(&stream->list); | |
fb45065e | 2680 | delete_ust_app_stream(-1, stream, app); |
7972aab2 | 2681 | } |
421cb601 | 2682 | |
7972aab2 DG |
2683 | error: |
2684 | return ret; | |
2685 | } | |
2686 | ||
2687 | /* | |
2688 | * Create a buffer registry channel for the given session registry and | |
2689 | * application channel object. If regp pointer is valid, it's set with the | |
2690 | * created object. Important, the created object is NOT added to the session | |
2691 | * registry hash table. | |
2692 | * | |
2693 | * Return 0 on success else a negative value. | |
2694 | */ | |
2695 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2696 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2697 | { | |
2698 | int ret; | |
2699 | struct buffer_reg_channel *reg_chan = NULL; | |
2700 | ||
2701 | assert(reg_sess); | |
2702 | assert(ua_chan); | |
2703 | ||
2704 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2705 | ||
2706 | /* Create buffer registry channel. */ | |
2707 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2708 | if (ret < 0) { | |
2709 | goto error_create; | |
421cb601 | 2710 | } |
7972aab2 DG |
2711 | assert(reg_chan); |
2712 | reg_chan->consumer_key = ua_chan->key; | |
8c924c7b | 2713 | reg_chan->subbuf_size = ua_chan->attr.subbuf_size; |
d07ceecd | 2714 | reg_chan->num_subbuf = ua_chan->attr.num_subbuf; |
421cb601 | 2715 | |
7972aab2 DG |
2716 | /* Create and add a channel registry to session. */ |
2717 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2718 | ua_chan->tracing_channel_id); | |
2719 | if (ret < 0) { | |
2720 | goto error; | |
d88aee68 | 2721 | } |
7972aab2 | 2722 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2723 | |
7972aab2 DG |
2724 | if (regp) { |
2725 | *regp = reg_chan; | |
3d8ca23b | 2726 | } |
d88aee68 | 2727 | |
7972aab2 | 2728 | return 0; |
3d8ca23b DG |
2729 | |
2730 | error: | |
7972aab2 DG |
2731 | /* Safe because the registry channel object was not added to any HT. */ |
2732 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2733 | error_create: | |
3d8ca23b | 2734 | return ret; |
421cb601 DG |
2735 | } |
2736 | ||
55cc08a6 | 2737 | /* |
7972aab2 DG |
2738 | * Setup buffer registry channel for the given session registry and application |
2739 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2740 | * |
7972aab2 | 2741 | * Return 0 on success else a negative value. |
55cc08a6 | 2742 | */ |
7972aab2 | 2743 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
fb45065e MD |
2744 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan, |
2745 | struct ust_app *app) | |
55cc08a6 | 2746 | { |
7972aab2 | 2747 | int ret; |
55cc08a6 | 2748 | |
7972aab2 DG |
2749 | assert(reg_sess); |
2750 | assert(reg_chan); | |
2751 | assert(ua_chan); | |
2752 | assert(ua_chan->obj); | |
55cc08a6 | 2753 | |
7972aab2 | 2754 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2755 | |
7972aab2 | 2756 | /* Setup all streams for the registry. */ |
fb45065e | 2757 | ret = setup_buffer_reg_streams(reg_chan, ua_chan, app); |
7972aab2 | 2758 | if (ret < 0) { |
55cc08a6 DG |
2759 | goto error; |
2760 | } | |
2761 | ||
7972aab2 DG |
2762 | reg_chan->obj.ust = ua_chan->obj; |
2763 | ua_chan->obj = NULL; | |
55cc08a6 | 2764 | |
7972aab2 | 2765 | return 0; |
55cc08a6 DG |
2766 | |
2767 | error: | |
7972aab2 DG |
2768 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2769 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2770 | return ret; |
2771 | } | |
2772 | ||
edb67388 | 2773 | /* |
7972aab2 | 2774 | * Send buffer registry channel to the application. |
d0b96690 | 2775 | * |
7972aab2 | 2776 | * Return 0 on success else a negative value. |
edb67388 | 2777 | */ |
7972aab2 DG |
2778 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2779 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2780 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2781 | { |
2782 | int ret; | |
7972aab2 | 2783 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2784 | |
7972aab2 DG |
2785 | assert(reg_chan); |
2786 | assert(app); | |
2787 | assert(ua_sess); | |
2788 | assert(ua_chan); | |
2789 | ||
2790 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2791 | ||
2792 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2793 | if (ret < 0) { |
2794 | goto error; | |
2795 | } | |
2796 | ||
7972aab2 DG |
2797 | /* Send channel to the application. */ |
2798 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
2799 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
2800 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
2801 | goto error; | |
2802 | } else if (ret < 0) { | |
7972aab2 DG |
2803 | goto error; |
2804 | } | |
2805 | ||
2806 | health_code_update(); | |
2807 | ||
2808 | /* Send all streams to application. */ | |
2809 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2810 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2811 | struct ust_app_stream stream; | |
2812 | ||
2813 | ret = duplicate_stream_object(reg_stream, &stream); | |
2814 | if (ret < 0) { | |
2815 | goto error_stream_unlock; | |
2816 | } | |
2817 | ||
2818 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2819 | if (ret < 0) { | |
fb45065e | 2820 | (void) release_ust_app_stream(-1, &stream, app); |
a7169585 MD |
2821 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
2822 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
2823 | goto error_stream_unlock; | |
2824 | } else if (ret < 0) { | |
2825 | goto error_stream_unlock; | |
2826 | } | |
7972aab2 DG |
2827 | goto error_stream_unlock; |
2828 | } | |
edb67388 | 2829 | |
7972aab2 DG |
2830 | /* |
2831 | * The return value is not important here. This function will output an | |
2832 | * error if needed. | |
2833 | */ | |
fb45065e | 2834 | (void) release_ust_app_stream(-1, &stream, app); |
7972aab2 DG |
2835 | } |
2836 | ua_chan->is_sent = 1; | |
2837 | ||
2838 | error_stream_unlock: | |
2839 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2840 | error: |
2841 | return ret; | |
2842 | } | |
2843 | ||
9730260e | 2844 | /* |
7972aab2 DG |
2845 | * Create and send to the application the created buffers with per UID buffers. |
2846 | * | |
2847 | * Return 0 on success else a negative value. | |
9730260e | 2848 | */ |
7972aab2 DG |
2849 | static int create_channel_per_uid(struct ust_app *app, |
2850 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2851 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2852 | { |
2853 | int ret; | |
7972aab2 DG |
2854 | struct buffer_reg_uid *reg_uid; |
2855 | struct buffer_reg_channel *reg_chan; | |
9730260e | 2856 | |
7972aab2 DG |
2857 | assert(app); |
2858 | assert(usess); | |
2859 | assert(ua_sess); | |
2860 | assert(ua_chan); | |
2861 | ||
2862 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2863 | ||
2864 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2865 | /* | |
2866 | * The session creation handles the creation of this global registry | |
2867 | * object. If none can be find, there is a code flow problem or a | |
2868 | * teardown race. | |
2869 | */ | |
2870 | assert(reg_uid); | |
2871 | ||
2872 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2873 | reg_uid); | |
2874 | if (!reg_chan) { | |
2875 | /* Create the buffer registry channel object. */ | |
2876 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2877 | if (ret < 0) { | |
f14256d6 MD |
2878 | ERR("Error creating the UST channel \"%s\" registry instance", |
2879 | ua_chan->name); | |
7972aab2 DG |
2880 | goto error; |
2881 | } | |
2882 | assert(reg_chan); | |
2883 | ||
2884 | /* | |
2885 | * Create the buffers on the consumer side. This call populates the | |
2886 | * ust app channel object with all streams and data object. | |
2887 | */ | |
2888 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2889 | app->bits_per_long, reg_uid->registry->reg.ust); | |
2890 | if (ret < 0) { | |
f14256d6 MD |
2891 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
2892 | ua_chan->name); | |
2893 | ||
07d2ae95 DG |
2894 | /* |
2895 | * Let's remove the previously created buffer registry channel so | |
2896 | * it's not visible anymore in the session registry. | |
2897 | */ | |
2898 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, | |
2899 | ua_chan->tracing_channel_id); | |
2900 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
2901 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
7972aab2 DG |
2902 | goto error; |
2903 | } | |
2904 | ||
2905 | /* | |
2906 | * Setup the streams and add it to the session registry. | |
2907 | */ | |
fb45065e MD |
2908 | ret = setup_buffer_reg_channel(reg_uid->registry, |
2909 | ua_chan, reg_chan, app); | |
7972aab2 | 2910 | if (ret < 0) { |
f14256d6 MD |
2911 | ERR("Error setting up UST channel \"%s\"", |
2912 | ua_chan->name); | |
7972aab2 DG |
2913 | goto error; |
2914 | } | |
2915 | ||
2916 | } | |
2917 | ||
2918 | /* Send buffers to the application. */ | |
2919 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
9730260e | 2920 | if (ret < 0) { |
a7169585 MD |
2921 | if (ret != -ENOTCONN) { |
2922 | ERR("Error sending channel to application"); | |
2923 | } | |
9730260e DG |
2924 | goto error; |
2925 | } | |
2926 | ||
9730260e DG |
2927 | error: |
2928 | return ret; | |
2929 | } | |
2930 | ||
78f0bacd | 2931 | /* |
7972aab2 DG |
2932 | * Create and send to the application the created buffers with per PID buffers. |
2933 | * | |
2934 | * Return 0 on success else a negative value. | |
78f0bacd | 2935 | */ |
7972aab2 DG |
2936 | static int create_channel_per_pid(struct ust_app *app, |
2937 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2938 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2939 | { |
8535a6d9 | 2940 | int ret; |
7972aab2 | 2941 | struct ust_registry_session *registry; |
78f0bacd | 2942 | |
7972aab2 DG |
2943 | assert(app); |
2944 | assert(usess); | |
2945 | assert(ua_sess); | |
2946 | assert(ua_chan); | |
2947 | ||
2948 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2949 | ||
2950 | rcu_read_lock(); | |
2951 | ||
2952 | registry = get_session_registry(ua_sess); | |
2953 | assert(registry); | |
2954 | ||
2955 | /* Create and add a new channel registry to session. */ | |
2956 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd | 2957 | if (ret < 0) { |
f14256d6 MD |
2958 | ERR("Error creating the UST channel \"%s\" registry instance", |
2959 | ua_chan->name); | |
78f0bacd DG |
2960 | goto error; |
2961 | } | |
2962 | ||
7972aab2 DG |
2963 | /* Create and get channel on the consumer side. */ |
2964 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2965 | app->bits_per_long, registry); | |
2966 | if (ret < 0) { | |
f14256d6 MD |
2967 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
2968 | ua_chan->name); | |
7972aab2 DG |
2969 | goto error; |
2970 | } | |
2971 | ||
2972 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
2973 | if (ret < 0) { | |
a7169585 MD |
2974 | if (ret != -ENOTCONN) { |
2975 | ERR("Error sending channel to application"); | |
2976 | } | |
7972aab2 DG |
2977 | goto error; |
2978 | } | |
8535a6d9 | 2979 | |
78f0bacd | 2980 | error: |
7972aab2 | 2981 | rcu_read_unlock(); |
78f0bacd DG |
2982 | return ret; |
2983 | } | |
2984 | ||
2985 | /* | |
7972aab2 DG |
2986 | * From an already allocated ust app channel, create the channel buffers if |
2987 | * need and send it to the application. This MUST be called with a RCU read | |
2988 | * side lock acquired. | |
2989 | * | |
a7169585 MD |
2990 | * Return 0 on success or else a negative value. Returns -ENOTCONN if |
2991 | * the application exited concurrently. | |
78f0bacd | 2992 | */ |
7972aab2 DG |
2993 | static int do_create_channel(struct ust_app *app, |
2994 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2995 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2996 | { |
7972aab2 | 2997 | int ret; |
78f0bacd | 2998 | |
7972aab2 DG |
2999 | assert(app); |
3000 | assert(usess); | |
3001 | assert(ua_sess); | |
3002 | assert(ua_chan); | |
3003 | ||
3004 | /* Handle buffer type before sending the channel to the application. */ | |
3005 | switch (usess->buffer_type) { | |
3006 | case LTTNG_BUFFER_PER_UID: | |
3007 | { | |
3008 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
3009 | if (ret < 0) { | |
3010 | goto error; | |
3011 | } | |
3012 | break; | |
3013 | } | |
3014 | case LTTNG_BUFFER_PER_PID: | |
3015 | { | |
3016 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
3017 | if (ret < 0) { | |
3018 | goto error; | |
3019 | } | |
3020 | break; | |
3021 | } | |
3022 | default: | |
3023 | assert(0); | |
3024 | ret = -EINVAL; | |
78f0bacd DG |
3025 | goto error; |
3026 | } | |
3027 | ||
7972aab2 DG |
3028 | /* Initialize ust objd object using the received handle and add it. */ |
3029 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
3030 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 3031 | |
7972aab2 DG |
3032 | /* If channel is not enabled, disable it on the tracer */ |
3033 | if (!ua_chan->enabled) { | |
3034 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
3035 | if (ret < 0) { | |
3036 | goto error; | |
3037 | } | |
78f0bacd DG |
3038 | } |
3039 | ||
3040 | error: | |
3041 | return ret; | |
3042 | } | |
3043 | ||
284d8f55 | 3044 | /* |
4d710ac2 DG |
3045 | * Create UST app channel and create it on the tracer. Set ua_chanp of the |
3046 | * newly created channel if not NULL. | |
d0b96690 | 3047 | * |
36b588ed | 3048 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 | 3049 | * |
a7169585 MD |
3050 | * Return 0 on success or else a negative value. Returns -ENOTCONN if |
3051 | * the application exited concurrently. | |
284d8f55 | 3052 | */ |
4d710ac2 DG |
3053 | static int create_ust_app_channel(struct ust_app_session *ua_sess, |
3054 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
7972aab2 | 3055 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 3056 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
3057 | { |
3058 | int ret = 0; | |
bec39940 DG |
3059 | struct lttng_ht_iter iter; |
3060 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
3061 | struct ust_app_channel *ua_chan; |
3062 | ||
3063 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3064 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
3065 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 3066 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 3067 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 3068 | goto end; |
5b4a0ec0 DG |
3069 | } |
3070 | ||
d0b96690 | 3071 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
3072 | if (ua_chan == NULL) { |
3073 | /* Only malloc can fail here */ | |
4d710ac2 | 3074 | ret = -ENOMEM; |
094d1690 | 3075 | goto error_alloc; |
fc34caaa DG |
3076 | } |
3077 | shadow_copy_channel(ua_chan, uchan); | |
3078 | ||
ffe60014 DG |
3079 | /* Set channel type. */ |
3080 | ua_chan->attr.type = type; | |
3081 | ||
7972aab2 | 3082 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
5b4a0ec0 DG |
3083 | if (ret < 0) { |
3084 | goto error; | |
3085 | } | |
3086 | ||
fc34caaa | 3087 | DBG2("UST app create channel %s for PID %d completed", ua_chan->name, |
852d0037 | 3088 | app->pid); |
fc34caaa | 3089 | |
d0b96690 DG |
3090 | /* Only add the channel if successful on the tracer side. */ |
3091 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
3092 | ||
fc34caaa | 3093 | end: |
4d710ac2 DG |
3094 | if (ua_chanp) { |
3095 | *ua_chanp = ua_chan; | |
3096 | } | |
3097 | ||
3098 | /* Everything went well. */ | |
3099 | return 0; | |
5b4a0ec0 DG |
3100 | |
3101 | error: | |
d0b96690 | 3102 | delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app); |
094d1690 | 3103 | error_alloc: |
4d710ac2 | 3104 | return ret; |
5b4a0ec0 DG |
3105 | } |
3106 | ||
3107 | /* | |
3108 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
3109 | * |
3110 | * Called with ust app session mutex held. | |
5b4a0ec0 | 3111 | */ |
edb67388 DG |
3112 | static |
3113 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
3114 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
3115 | struct ust_app *app) | |
284d8f55 | 3116 | { |
edb67388 | 3117 | int ret = 0; |
5b4a0ec0 | 3118 | struct ust_app_event *ua_event; |
284d8f55 | 3119 | |
5b4a0ec0 | 3120 | /* Get event node */ |
18eace3b | 3121 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 3122 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 3123 | if (ua_event != NULL) { |
fc34caaa | 3124 | ret = -EEXIST; |
edb67388 DG |
3125 | goto end; |
3126 | } | |
5b4a0ec0 | 3127 | |
edb67388 DG |
3128 | /* Does not exist so create one */ |
3129 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); | |
3130 | if (ua_event == NULL) { | |
3131 | /* Only malloc can failed so something is really wrong */ | |
3132 | ret = -ENOMEM; | |
fc34caaa | 3133 | goto end; |
5b4a0ec0 | 3134 | } |
edb67388 | 3135 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 3136 | |
edb67388 | 3137 | /* Create it on the tracer side */ |
5b4a0ec0 | 3138 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 3139 | if (ret < 0) { |
fc34caaa | 3140 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 3141 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
3142 | goto error; |
3143 | } | |
3144 | ||
d0b96690 | 3145 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 3146 | |
fc34caaa | 3147 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 3148 | app->pid); |
7f79d3a1 | 3149 | |
edb67388 | 3150 | end: |
fc34caaa DG |
3151 | return ret; |
3152 | ||
5b4a0ec0 | 3153 | error: |
fc34caaa | 3154 | /* Valid. Calling here is already in a read side lock */ |
fb45065e | 3155 | delete_ust_app_event(-1, ua_event, app); |
edb67388 | 3156 | return ret; |
5b4a0ec0 DG |
3157 | } |
3158 | ||
3159 | /* | |
3160 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 3161 | * |
7972aab2 | 3162 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
3163 | */ |
3164 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
ad7a9107 | 3165 | struct ust_app *app, struct consumer_output *consumer) |
5b4a0ec0 DG |
3166 | { |
3167 | int ret = 0; | |
ffe60014 | 3168 | struct ust_app_channel *metadata; |
d88aee68 | 3169 | struct consumer_socket *socket; |
7972aab2 | 3170 | struct ust_registry_session *registry; |
5b4a0ec0 | 3171 | |
ffe60014 DG |
3172 | assert(ua_sess); |
3173 | assert(app); | |
d88aee68 | 3174 | assert(consumer); |
5b4a0ec0 | 3175 | |
7972aab2 DG |
3176 | registry = get_session_registry(ua_sess); |
3177 | assert(registry); | |
3178 | ||
ce34fcd0 MD |
3179 | pthread_mutex_lock(®istry->lock); |
3180 | ||
1b532a60 DG |
3181 | /* Metadata already exists for this registry or it was closed previously */ |
3182 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
3183 | ret = 0; |
3184 | goto error; | |
5b4a0ec0 DG |
3185 | } |
3186 | ||
ffe60014 | 3187 | /* Allocate UST metadata */ |
d0b96690 | 3188 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
3189 | if (!metadata) { |
3190 | /* malloc() failed */ | |
3191 | ret = -ENOMEM; | |
3192 | goto error; | |
3193 | } | |
5b4a0ec0 | 3194 | |
ad7a9107 | 3195 | memcpy(&metadata->attr, &ua_sess->metadata_attr, sizeof(metadata->attr)); |
5b4a0ec0 | 3196 | |
7972aab2 DG |
3197 | /* Need one fd for the channel. */ |
3198 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
3199 | if (ret < 0) { | |
3200 | ERR("Exhausted number of available FD upon create metadata"); | |
3201 | goto error; | |
3202 | } | |
3203 | ||
4dc3dfc5 DG |
3204 | /* Get the right consumer socket for the application. */ |
3205 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
3206 | if (!socket) { | |
3207 | ret = -EINVAL; | |
3208 | goto error_consumer; | |
3209 | } | |
3210 | ||
331744e3 JD |
3211 | /* |
3212 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
3213 | * to the registry *before* we ask the consumer so we avoid the race of the | |
3214 | * consumer requesting the metadata and the ask_channel call on our side | |
3215 | * did not returned yet. | |
3216 | */ | |
3217 | registry->metadata_key = metadata->key; | |
3218 | ||
d88aee68 DG |
3219 | /* |
3220 | * Ask the metadata channel creation to the consumer. The metadata object | |
3221 | * will be created by the consumer and kept their. However, the stream is | |
3222 | * never added or monitored until we do a first push metadata to the | |
3223 | * consumer. | |
3224 | */ | |
7972aab2 DG |
3225 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
3226 | registry); | |
d88aee68 | 3227 | if (ret < 0) { |
f2a444f1 DG |
3228 | /* Nullify the metadata key so we don't try to close it later on. */ |
3229 | registry->metadata_key = 0; | |
d88aee68 DG |
3230 | goto error_consumer; |
3231 | } | |
3232 | ||
3233 | /* | |
3234 | * The setup command will make the metadata stream be sent to the relayd, | |
3235 | * if applicable, and the thread managing the metadatas. This is important | |
3236 | * because after this point, if an error occurs, the only way the stream | |
3237 | * can be deleted is to be monitored in the consumer. | |
3238 | */ | |
7972aab2 | 3239 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 3240 | if (ret < 0) { |
f2a444f1 DG |
3241 | /* Nullify the metadata key so we don't try to close it later on. */ |
3242 | registry->metadata_key = 0; | |
d88aee68 | 3243 | goto error_consumer; |
5b4a0ec0 DG |
3244 | } |
3245 | ||
7972aab2 DG |
3246 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
3247 | metadata->key, app->pid); | |
5b4a0ec0 | 3248 | |
d88aee68 | 3249 | error_consumer: |
b80f0b6c | 3250 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 3251 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 3252 | error: |
ce34fcd0 | 3253 | pthread_mutex_unlock(®istry->lock); |
ffe60014 | 3254 | return ret; |
5b4a0ec0 DG |
3255 | } |
3256 | ||
5b4a0ec0 | 3257 | /* |
d88aee68 DG |
3258 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
3259 | * acquired before calling this function. | |
5b4a0ec0 DG |
3260 | */ |
3261 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
3262 | { | |
d88aee68 | 3263 | struct ust_app *app = NULL; |
bec39940 DG |
3264 | struct lttng_ht_node_ulong *node; |
3265 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 3266 | |
bec39940 DG |
3267 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
3268 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
3269 | if (node == NULL) { |
3270 | DBG2("UST app no found with pid %d", pid); | |
3271 | goto error; | |
3272 | } | |
5b4a0ec0 DG |
3273 | |
3274 | DBG2("Found UST app by pid %d", pid); | |
3275 | ||
d88aee68 | 3276 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
3277 | |
3278 | error: | |
d88aee68 | 3279 | return app; |
5b4a0ec0 DG |
3280 | } |
3281 | ||
d88aee68 DG |
3282 | /* |
3283 | * Allocate and init an UST app object using the registration information and | |
3284 | * the command socket. This is called when the command socket connects to the | |
3285 | * session daemon. | |
3286 | * | |
3287 | * The object is returned on success or else NULL. | |
3288 | */ | |
d0b96690 | 3289 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 3290 | { |
d0b96690 DG |
3291 | struct ust_app *lta = NULL; |
3292 | ||
3293 | assert(msg); | |
3294 | assert(sock >= 0); | |
3295 | ||
3296 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 3297 | |
173af62f DG |
3298 | if ((msg->bits_per_long == 64 && |
3299 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
3300 | || (msg->bits_per_long == 32 && | |
3301 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 3302 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
3303 | "%d-bit long, but no consumerd for this size is available.\n", |
3304 | msg->name, msg->pid, msg->bits_per_long); | |
3305 | goto error; | |
3f2c5fcc | 3306 | } |
d0b96690 | 3307 | |
5b4a0ec0 DG |
3308 | lta = zmalloc(sizeof(struct ust_app)); |
3309 | if (lta == NULL) { | |
3310 | PERROR("malloc"); | |
d0b96690 | 3311 | goto error; |
5b4a0ec0 DG |
3312 | } |
3313 | ||
3314 | lta->ppid = msg->ppid; | |
3315 | lta->uid = msg->uid; | |
3316 | lta->gid = msg->gid; | |
d0b96690 | 3317 | |
7753dea8 | 3318 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
3319 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
3320 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
3321 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
3322 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
3323 | lta->long_alignment = msg->long_alignment; | |
3324 | lta->byte_order = msg->byte_order; | |
3325 | ||
5b4a0ec0 DG |
3326 | lta->v_major = msg->major; |
3327 | lta->v_minor = msg->minor; | |
d9bf3ca4 | 3328 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 | 3329 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
10b56aef | 3330 | lta->ust_sessions_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3331 | lta->notify_sock = -1; |
d88aee68 DG |
3332 | |
3333 | /* Copy name and make sure it's NULL terminated. */ | |
3334 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
3335 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
3336 | ||
3337 | /* | |
3338 | * Before this can be called, when receiving the registration information, | |
3339 | * the application compatibility is checked. So, at this point, the | |
3340 | * application can work with this session daemon. | |
3341 | */ | |
d0b96690 | 3342 | lta->compatible = 1; |
5b4a0ec0 | 3343 | |
852d0037 | 3344 | lta->pid = msg->pid; |
d0b96690 | 3345 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 3346 | lta->sock = sock; |
fb45065e | 3347 | pthread_mutex_init(<a->sock_lock, NULL); |
d0b96690 | 3348 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 3349 | |
d42f20df | 3350 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
d0b96690 DG |
3351 | error: |
3352 | return lta; | |
3353 | } | |
3354 | ||
d88aee68 DG |
3355 | /* |
3356 | * For a given application object, add it to every hash table. | |
3357 | */ | |
d0b96690 DG |
3358 | void ust_app_add(struct ust_app *app) |
3359 | { | |
3360 | assert(app); | |
3361 | assert(app->notify_sock >= 0); | |
3362 | ||
5b4a0ec0 | 3363 | rcu_read_lock(); |
852d0037 DG |
3364 | |
3365 | /* | |
3366 | * On a re-registration, we want to kick out the previous registration of | |
3367 | * that pid | |
3368 | */ | |
d0b96690 | 3369 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
3370 | |
3371 | /* | |
3372 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
3373 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
3374 | * already in the table. | |
3375 | */ | |
d0b96690 | 3376 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 3377 | |
d0b96690 DG |
3378 | /* Add application to the notify socket hash table. */ |
3379 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
3380 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 3381 | |
d0b96690 | 3382 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
3383 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
3384 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
3385 | app->v_minor); | |
5b4a0ec0 | 3386 | |
d0b96690 DG |
3387 | rcu_read_unlock(); |
3388 | } | |
3389 | ||
d88aee68 DG |
3390 | /* |
3391 | * Set the application version into the object. | |
3392 | * | |
3393 | * Return 0 on success else a negative value either an errno code or a | |
3394 | * LTTng-UST error code. | |
3395 | */ | |
d0b96690 DG |
3396 | int ust_app_version(struct ust_app *app) |
3397 | { | |
d88aee68 DG |
3398 | int ret; |
3399 | ||
d0b96690 | 3400 | assert(app); |
d88aee68 | 3401 | |
fb45065e | 3402 | pthread_mutex_lock(&app->sock_lock); |
d88aee68 | 3403 | ret = ustctl_tracer_version(app->sock, &app->version); |
fb45065e | 3404 | pthread_mutex_unlock(&app->sock_lock); |
d88aee68 DG |
3405 | if (ret < 0) { |
3406 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
5368d366 | 3407 | ERR("UST app %d version failed with ret %d", app->sock, ret); |
d88aee68 | 3408 | } else { |
5368d366 | 3409 | DBG3("UST app %d version failed. Application is dead", app->sock); |
d88aee68 DG |
3410 | } |
3411 | } | |
3412 | ||
3413 | return ret; | |
5b4a0ec0 DG |
3414 | } |
3415 | ||
3416 | /* | |
3417 | * Unregister app by removing it from the global traceable app list and freeing | |
3418 | * the data struct. | |
3419 | * | |
3420 | * The socket is already closed at this point so no close to sock. | |
3421 | */ | |
3422 | void ust_app_unregister(int sock) | |
3423 | { | |
3424 | struct ust_app *lta; | |
bec39940 | 3425 | struct lttng_ht_node_ulong *node; |
c4b88406 | 3426 | struct lttng_ht_iter ust_app_sock_iter; |
bec39940 | 3427 | struct lttng_ht_iter iter; |
d42f20df | 3428 | struct ust_app_session *ua_sess; |
525b0740 | 3429 | int ret; |
5b4a0ec0 DG |
3430 | |
3431 | rcu_read_lock(); | |
886459c6 | 3432 | |
5b4a0ec0 | 3433 | /* Get the node reference for a call_rcu */ |
c4b88406 MD |
3434 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &ust_app_sock_iter); |
3435 | node = lttng_ht_iter_get_node_ulong(&ust_app_sock_iter); | |
d0b96690 | 3436 | assert(node); |
284d8f55 | 3437 | |
852d0037 | 3438 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
3439 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
3440 | ||
d88aee68 | 3441 | /* |
ce34fcd0 MD |
3442 | * For per-PID buffers, perform "push metadata" and flush all |
3443 | * application streams before removing app from hash tables, | |
3444 | * ensuring proper behavior of data_pending check. | |
c4b88406 | 3445 | * Remove sessions so they are not visible during deletion. |
d88aee68 | 3446 | */ |
d42f20df DG |
3447 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, |
3448 | node.node) { | |
7972aab2 DG |
3449 | struct ust_registry_session *registry; |
3450 | ||
d42f20df DG |
3451 | ret = lttng_ht_del(lta->sessions, &iter); |
3452 | if (ret) { | |
3453 | /* The session was already removed so scheduled for teardown. */ | |
3454 | continue; | |
3455 | } | |
3456 | ||
ce34fcd0 MD |
3457 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { |
3458 | (void) ust_app_flush_app_session(lta, ua_sess); | |
3459 | } | |
c4b88406 | 3460 | |
d42f20df DG |
3461 | /* |
3462 | * Add session to list for teardown. This is safe since at this point we | |
3463 | * are the only one using this list. | |
3464 | */ | |
d88aee68 DG |
3465 | pthread_mutex_lock(&ua_sess->lock); |
3466 | ||
b161602a MD |
3467 | if (ua_sess->deleted) { |
3468 | pthread_mutex_unlock(&ua_sess->lock); | |
3469 | continue; | |
3470 | } | |
3471 | ||
d88aee68 DG |
3472 | /* |
3473 | * Normally, this is done in the delete session process which is | |
3474 | * executed in the call rcu below. However, upon registration we can't | |
3475 | * afford to wait for the grace period before pushing data or else the | |
3476 | * data pending feature can race between the unregistration and stop | |
3477 | * command where the data pending command is sent *before* the grace | |
3478 | * period ended. | |
3479 | * | |
3480 | * The close metadata below nullifies the metadata pointer in the | |
3481 | * session so the delete session will NOT push/close a second time. | |
3482 | */ | |
7972aab2 | 3483 | registry = get_session_registry(ua_sess); |
ce34fcd0 | 3484 | if (registry) { |
7972aab2 DG |
3485 | /* Push metadata for application before freeing the application. */ |
3486 | (void) push_metadata(registry, ua_sess->consumer); | |
3487 | ||
3488 | /* | |
3489 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
3490 | * metadata only on destroy trace session in this case. Also, the |
3491 | * previous push metadata could have flag the metadata registry to | |
3492 | * close so don't send a close command if closed. | |
7972aab2 | 3493 | */ |
ce34fcd0 | 3494 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
3495 | /* And ask to close it for this session registry. */ |
3496 | (void) close_metadata(registry, ua_sess->consumer); | |
3497 | } | |
3498 | } | |
d42f20df | 3499 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
c4b88406 | 3500 | |
d88aee68 | 3501 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
3502 | } |
3503 | ||
c4b88406 MD |
3504 | /* Remove application from PID hash table */ |
3505 | ret = lttng_ht_del(ust_app_ht_by_sock, &ust_app_sock_iter); | |
3506 | assert(!ret); | |
3507 | ||
3508 | /* | |
3509 | * Remove application from notify hash table. The thread handling the | |
3510 | * notify socket could have deleted the node so ignore on error because | |
3511 | * either way it's valid. The close of that socket is handled by the other | |
3512 | * thread. | |
3513 | */ | |
3514 | iter.iter.node = <a->notify_sock_n.node; | |
3515 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3516 | ||
3517 | /* | |
3518 | * Ignore return value since the node might have been removed before by an | |
3519 | * add replace during app registration because the PID can be reassigned by | |
3520 | * the OS. | |
3521 | */ | |
3522 | iter.iter.node = <a->pid_n.node; | |
3523 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3524 | if (ret) { | |
3525 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
3526 | lta->pid); | |
3527 | } | |
3528 | ||
852d0037 DG |
3529 | /* Free memory */ |
3530 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
3531 | ||
5b4a0ec0 DG |
3532 | rcu_read_unlock(); |
3533 | return; | |
284d8f55 DG |
3534 | } |
3535 | ||
5b4a0ec0 DG |
3536 | /* |
3537 | * Fill events array with all events name of all registered apps. | |
3538 | */ | |
3539 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 3540 | { |
5b4a0ec0 DG |
3541 | int ret, handle; |
3542 | size_t nbmem, count = 0; | |
bec39940 | 3543 | struct lttng_ht_iter iter; |
5b4a0ec0 | 3544 | struct ust_app *app; |
c617c0c6 | 3545 | struct lttng_event *tmp_event; |
421cb601 | 3546 | |
5b4a0ec0 | 3547 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
3548 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
3549 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
3550 | PERROR("zmalloc ust app events"); |
3551 | ret = -ENOMEM; | |
421cb601 DG |
3552 | goto error; |
3553 | } | |
3554 | ||
5b4a0ec0 | 3555 | rcu_read_lock(); |
421cb601 | 3556 | |
852d0037 | 3557 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 3558 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 3559 | |
840cb59c | 3560 | health_code_update(); |
86acf0da | 3561 | |
e0c7ec2b DG |
3562 | if (!app->compatible) { |
3563 | /* | |
3564 | * TODO: In time, we should notice the caller of this error by | |
3565 | * telling him that this is a version error. | |
3566 | */ | |
3567 | continue; | |
3568 | } | |
fb45065e | 3569 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 3570 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 3571 | if (handle < 0) { |
ffe60014 DG |
3572 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3573 | ERR("UST app list events getting handle failed for app pid %d", | |
3574 | app->pid); | |
3575 | } | |
fb45065e | 3576 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 DG |
3577 | continue; |
3578 | } | |
421cb601 | 3579 | |
852d0037 | 3580 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 3581 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3582 | /* Handle ustctl error. */ |
3583 | if (ret < 0) { | |
fb45065e MD |
3584 | int release_ret; |
3585 | ||
a2ba1ab0 | 3586 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3587 | ERR("UST app tp list get failed for app %d with ret %d", |
3588 | app->sock, ret); | |
3589 | } else { | |
3590 | DBG3("UST app tp list get failed. Application is dead"); | |
3757b385 DG |
3591 | /* |
3592 | * This is normal behavior, an application can die during the | |
3593 | * creation process. Don't report an error so the execution can | |
3594 | * continue normally. Continue normal execution. | |
3595 | */ | |
3596 | break; | |
ffe60014 | 3597 | } |
98f595d4 | 3598 | free(tmp_event); |
fb45065e | 3599 | release_ret = ustctl_release_handle(app->sock, handle); |
68313703 JG |
3600 | if (release_ret < 0 && |
3601 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3602 | release_ret != -EPIPE) { | |
fb45065e MD |
3603 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3604 | } | |
3605 | pthread_mutex_unlock(&app->sock_lock); | |
ffe60014 DG |
3606 | goto rcu_error; |
3607 | } | |
3608 | ||
840cb59c | 3609 | health_code_update(); |
815564d8 | 3610 | if (count >= nbmem) { |
d7b3776f | 3611 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3612 | struct lttng_event *new_tmp_event; |
3613 | size_t new_nbmem; | |
3614 | ||
3615 | new_nbmem = nbmem << 1; | |
3616 | DBG2("Reallocating event list from %zu to %zu entries", | |
3617 | nbmem, new_nbmem); | |
3618 | new_tmp_event = realloc(tmp_event, | |
3619 | new_nbmem * sizeof(struct lttng_event)); | |
3620 | if (new_tmp_event == NULL) { | |
fb45065e MD |
3621 | int release_ret; |
3622 | ||
5b4a0ec0 | 3623 | PERROR("realloc ust app events"); |
c617c0c6 | 3624 | free(tmp_event); |
5b4a0ec0 | 3625 | ret = -ENOMEM; |
fb45065e | 3626 | release_ret = ustctl_release_handle(app->sock, handle); |
68313703 JG |
3627 | if (release_ret < 0 && |
3628 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3629 | release_ret != -EPIPE) { | |
fb45065e MD |
3630 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3631 | } | |
3632 | pthread_mutex_unlock(&app->sock_lock); | |
5b4a0ec0 DG |
3633 | goto rcu_error; |
3634 | } | |
53efb85a MD |
3635 | /* Zero the new memory */ |
3636 | memset(new_tmp_event + nbmem, 0, | |
3637 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
3638 | nbmem = new_nbmem; | |
3639 | tmp_event = new_tmp_event; | |
5b4a0ec0 | 3640 | } |
c617c0c6 MD |
3641 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
3642 | tmp_event[count].loglevel = uiter.loglevel; | |
3643 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
3644 | tmp_event[count].pid = app->pid; | |
3645 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 3646 | count++; |
421cb601 | 3647 | } |
fb45065e MD |
3648 | ret = ustctl_release_handle(app->sock, handle); |
3649 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 | 3650 | if (ret < 0 && ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
fb45065e MD |
3651 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
3652 | } | |
421cb601 DG |
3653 | } |
3654 | ||
5b4a0ec0 | 3655 | ret = count; |
c617c0c6 | 3656 | *events = tmp_event; |
421cb601 | 3657 | |
5b4a0ec0 | 3658 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 3659 | |
5b4a0ec0 DG |
3660 | rcu_error: |
3661 | rcu_read_unlock(); | |
421cb601 | 3662 | error: |
840cb59c | 3663 | health_code_update(); |
5b4a0ec0 | 3664 | return ret; |
421cb601 DG |
3665 | } |
3666 | ||
f37d259d MD |
3667 | /* |
3668 | * Fill events array with all events name of all registered apps. | |
3669 | */ | |
3670 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
3671 | { | |
3672 | int ret, handle; | |
3673 | size_t nbmem, count = 0; | |
3674 | struct lttng_ht_iter iter; | |
3675 | struct ust_app *app; | |
c617c0c6 | 3676 | struct lttng_event_field *tmp_event; |
f37d259d MD |
3677 | |
3678 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
3679 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
3680 | if (tmp_event == NULL) { | |
f37d259d MD |
3681 | PERROR("zmalloc ust app event fields"); |
3682 | ret = -ENOMEM; | |
3683 | goto error; | |
3684 | } | |
3685 | ||
3686 | rcu_read_lock(); | |
3687 | ||
3688 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3689 | struct lttng_ust_field_iter uiter; | |
3690 | ||
840cb59c | 3691 | health_code_update(); |
86acf0da | 3692 | |
f37d259d MD |
3693 | if (!app->compatible) { |
3694 | /* | |
3695 | * TODO: In time, we should notice the caller of this error by | |
3696 | * telling him that this is a version error. | |
3697 | */ | |
3698 | continue; | |
3699 | } | |
fb45065e | 3700 | pthread_mutex_lock(&app->sock_lock); |
f37d259d MD |
3701 | handle = ustctl_tracepoint_field_list(app->sock); |
3702 | if (handle < 0) { | |
ffe60014 DG |
3703 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3704 | ERR("UST app list field getting handle failed for app pid %d", | |
3705 | app->pid); | |
3706 | } | |
fb45065e | 3707 | pthread_mutex_unlock(&app->sock_lock); |
f37d259d MD |
3708 | continue; |
3709 | } | |
3710 | ||
3711 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 3712 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3713 | /* Handle ustctl error. */ |
3714 | if (ret < 0) { | |
fb45065e MD |
3715 | int release_ret; |
3716 | ||
a2ba1ab0 | 3717 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3718 | ERR("UST app tp list field failed for app %d with ret %d", |
3719 | app->sock, ret); | |
3720 | } else { | |
3721 | DBG3("UST app tp list field failed. Application is dead"); | |
3757b385 DG |
3722 | /* |
3723 | * This is normal behavior, an application can die during the | |
3724 | * creation process. Don't report an error so the execution can | |
98f595d4 | 3725 | * continue normally. Reset list and count for next app. |
3757b385 DG |
3726 | */ |
3727 | break; | |
ffe60014 | 3728 | } |
98f595d4 | 3729 | free(tmp_event); |
fb45065e MD |
3730 | release_ret = ustctl_release_handle(app->sock, handle); |
3731 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
3732 | if (release_ret < 0 && |
3733 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3734 | release_ret != -EPIPE) { | |
fb45065e MD |
3735 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3736 | } | |
ffe60014 DG |
3737 | goto rcu_error; |
3738 | } | |
3739 | ||
840cb59c | 3740 | health_code_update(); |
f37d259d | 3741 | if (count >= nbmem) { |
d7b3776f | 3742 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3743 | struct lttng_event_field *new_tmp_event; |
3744 | size_t new_nbmem; | |
3745 | ||
3746 | new_nbmem = nbmem << 1; | |
3747 | DBG2("Reallocating event field list from %zu to %zu entries", | |
3748 | nbmem, new_nbmem); | |
3749 | new_tmp_event = realloc(tmp_event, | |
3750 | new_nbmem * sizeof(struct lttng_event_field)); | |
3751 | if (new_tmp_event == NULL) { | |
fb45065e MD |
3752 | int release_ret; |
3753 | ||
f37d259d | 3754 | PERROR("realloc ust app event fields"); |
c617c0c6 | 3755 | free(tmp_event); |
f37d259d | 3756 | ret = -ENOMEM; |
fb45065e MD |
3757 | release_ret = ustctl_release_handle(app->sock, handle); |
3758 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
3759 | if (release_ret && |
3760 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3761 | release_ret != -EPIPE) { | |
fb45065e MD |
3762 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3763 | } | |
f37d259d MD |
3764 | goto rcu_error; |
3765 | } | |
53efb85a MD |
3766 | /* Zero the new memory */ |
3767 | memset(new_tmp_event + nbmem, 0, | |
3768 | (new_nbmem - nbmem) * sizeof(struct lttng_event_field)); | |
3769 | nbmem = new_nbmem; | |
3770 | tmp_event = new_tmp_event; | |
f37d259d | 3771 | } |
f37d259d | 3772 | |
c617c0c6 | 3773 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
2e84128e DG |
3774 | /* Mapping between these enums matches 1 to 1. */ |
3775 | tmp_event[count].type = (enum lttng_event_field_type) uiter.type; | |
c617c0c6 | 3776 | tmp_event[count].nowrite = uiter.nowrite; |
f37d259d | 3777 | |
c617c0c6 MD |
3778 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
3779 | tmp_event[count].event.loglevel = uiter.loglevel; | |
2e84128e | 3780 | tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; |
c617c0c6 MD |
3781 | tmp_event[count].event.pid = app->pid; |
3782 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
3783 | count++; |
3784 | } | |
fb45065e MD |
3785 | ret = ustctl_release_handle(app->sock, handle); |
3786 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
3787 | if (ret < 0 && |
3788 | ret != -LTTNG_UST_ERR_EXITING && | |
3789 | ret != -EPIPE) { | |
fb45065e MD |
3790 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
3791 | } | |
f37d259d MD |
3792 | } |
3793 | ||
3794 | ret = count; | |
c617c0c6 | 3795 | *fields = tmp_event; |
f37d259d MD |
3796 | |
3797 | DBG2("UST app list event fields done (%zu events)", count); | |
3798 | ||
3799 | rcu_error: | |
3800 | rcu_read_unlock(); | |
3801 | error: | |
840cb59c | 3802 | health_code_update(); |
f37d259d MD |
3803 | return ret; |
3804 | } | |
3805 | ||
5b4a0ec0 DG |
3806 | /* |
3807 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
3808 | * |
3809 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
3810 | */ |
3811 | void ust_app_clean_list(void) | |
421cb601 | 3812 | { |
5b4a0ec0 | 3813 | int ret; |
659ed79f | 3814 | struct ust_app *app; |
bec39940 | 3815 | struct lttng_ht_iter iter; |
421cb601 | 3816 | |
5b4a0ec0 | 3817 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3818 | |
5b4a0ec0 | 3819 | rcu_read_lock(); |
421cb601 | 3820 | |
f1b711c4 MD |
3821 | if (ust_app_ht) { |
3822 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3823 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3824 | assert(!ret); | |
3825 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
3826 | } | |
421cb601 DG |
3827 | } |
3828 | ||
852d0037 | 3829 | /* Cleanup socket hash table */ |
f1b711c4 MD |
3830 | if (ust_app_ht_by_sock) { |
3831 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, | |
3832 | sock_n.node) { | |
3833 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); | |
3834 | assert(!ret); | |
3835 | } | |
bec39940 | 3836 | } |
852d0037 | 3837 | |
d88aee68 | 3838 | /* Cleanup notify socket hash table */ |
f1b711c4 MD |
3839 | if (ust_app_ht_by_notify_sock) { |
3840 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3841 | notify_sock_n.node) { | |
3842 | ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3843 | assert(!ret); | |
3844 | } | |
d88aee68 | 3845 | } |
36b588ed | 3846 | rcu_read_unlock(); |
d88aee68 | 3847 | |
bec39940 | 3848 | /* Destroy is done only when the ht is empty */ |
f1b711c4 MD |
3849 | if (ust_app_ht) { |
3850 | ht_cleanup_push(ust_app_ht); | |
3851 | } | |
3852 | if (ust_app_ht_by_sock) { | |
3853 | ht_cleanup_push(ust_app_ht_by_sock); | |
3854 | } | |
3855 | if (ust_app_ht_by_notify_sock) { | |
3856 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
3857 | } | |
5b4a0ec0 DG |
3858 | } |
3859 | ||
3860 | /* | |
3861 | * Init UST app hash table. | |
3862 | */ | |
57703f6e | 3863 | int ust_app_ht_alloc(void) |
5b4a0ec0 | 3864 | { |
bec39940 | 3865 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3866 | if (!ust_app_ht) { |
3867 | return -1; | |
3868 | } | |
852d0037 | 3869 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3870 | if (!ust_app_ht_by_sock) { |
3871 | return -1; | |
3872 | } | |
d0b96690 | 3873 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3874 | if (!ust_app_ht_by_notify_sock) { |
3875 | return -1; | |
3876 | } | |
3877 | return 0; | |
421cb601 DG |
3878 | } |
3879 | ||
78f0bacd DG |
3880 | /* |
3881 | * For a specific UST session, disable the channel for all registered apps. | |
3882 | */ | |
35a9059d | 3883 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3884 | struct ltt_ust_channel *uchan) |
3885 | { | |
3886 | int ret = 0; | |
bec39940 DG |
3887 | struct lttng_ht_iter iter; |
3888 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3889 | struct ust_app *app; |
3890 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3891 | struct ust_app_channel *ua_chan; |
78f0bacd DG |
3892 | |
3893 | if (usess == NULL || uchan == NULL) { | |
3894 | ERR("Disabling UST global channel with NULL values"); | |
3895 | ret = -1; | |
3896 | goto error; | |
3897 | } | |
3898 | ||
d9bf3ca4 | 3899 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 3900 | uchan->name, usess->id); |
78f0bacd DG |
3901 | |
3902 | rcu_read_lock(); | |
3903 | ||
3904 | /* For every registered applications */ | |
852d0037 | 3905 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3906 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3907 | if (!app->compatible) { |
3908 | /* | |
3909 | * TODO: In time, we should notice the caller of this error by | |
3910 | * telling him that this is a version error. | |
3911 | */ | |
3912 | continue; | |
3913 | } | |
78f0bacd DG |
3914 | ua_sess = lookup_session_by_app(usess, app); |
3915 | if (ua_sess == NULL) { | |
3916 | continue; | |
3917 | } | |
3918 | ||
8535a6d9 | 3919 | /* Get channel */ |
bec39940 DG |
3920 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3921 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
3922 | /* If the session if found for the app, the channel must be there */ |
3923 | assert(ua_chan_node); | |
3924 | ||
3925 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3926 | /* The channel must not be already disabled */ | |
3927 | assert(ua_chan->enabled == 1); | |
3928 | ||
3929 | /* Disable channel onto application */ | |
3930 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
3931 | if (ret < 0) { |
3932 | /* XXX: We might want to report this error at some point... */ | |
3933 | continue; | |
3934 | } | |
3935 | } | |
3936 | ||
3937 | rcu_read_unlock(); | |
3938 | ||
3939 | error: | |
3940 | return ret; | |
3941 | } | |
3942 | ||
3943 | /* | |
3944 | * For a specific UST session, enable the channel for all registered apps. | |
3945 | */ | |
35a9059d | 3946 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3947 | struct ltt_ust_channel *uchan) |
3948 | { | |
3949 | int ret = 0; | |
bec39940 | 3950 | struct lttng_ht_iter iter; |
78f0bacd DG |
3951 | struct ust_app *app; |
3952 | struct ust_app_session *ua_sess; | |
3953 | ||
3954 | if (usess == NULL || uchan == NULL) { | |
3955 | ERR("Adding UST global channel to NULL values"); | |
3956 | ret = -1; | |
3957 | goto error; | |
3958 | } | |
3959 | ||
d9bf3ca4 | 3960 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 3961 | uchan->name, usess->id); |
78f0bacd DG |
3962 | |
3963 | rcu_read_lock(); | |
3964 | ||
3965 | /* For every registered applications */ | |
852d0037 | 3966 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3967 | if (!app->compatible) { |
3968 | /* | |
3969 | * TODO: In time, we should notice the caller of this error by | |
3970 | * telling him that this is a version error. | |
3971 | */ | |
3972 | continue; | |
3973 | } | |
78f0bacd DG |
3974 | ua_sess = lookup_session_by_app(usess, app); |
3975 | if (ua_sess == NULL) { | |
3976 | continue; | |
3977 | } | |
3978 | ||
3979 | /* Enable channel onto application */ | |
3980 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
3981 | if (ret < 0) { | |
3982 | /* XXX: We might want to report this error at some point... */ | |
3983 | continue; | |
3984 | } | |
3985 | } | |
3986 | ||
3987 | rcu_read_unlock(); | |
3988 | ||
3989 | error: | |
3990 | return ret; | |
3991 | } | |
3992 | ||
b0a40d28 DG |
3993 | /* |
3994 | * Disable an event in a channel and for a specific session. | |
3995 | */ | |
35a9059d DG |
3996 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
3997 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
3998 | { |
3999 | int ret = 0; | |
bec39940 | 4000 | struct lttng_ht_iter iter, uiter; |
700c5a9d | 4001 | struct lttng_ht_node_str *ua_chan_node; |
b0a40d28 DG |
4002 | struct ust_app *app; |
4003 | struct ust_app_session *ua_sess; | |
4004 | struct ust_app_channel *ua_chan; | |
4005 | struct ust_app_event *ua_event; | |
4006 | ||
4007 | DBG("UST app disabling event %s for all apps in channel " | |
d9bf3ca4 MD |
4008 | "%s for session id %" PRIu64, |
4009 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
4010 | |
4011 | rcu_read_lock(); | |
4012 | ||
4013 | /* For all registered applications */ | |
852d0037 | 4014 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4015 | if (!app->compatible) { |
4016 | /* | |
4017 | * TODO: In time, we should notice the caller of this error by | |
4018 | * telling him that this is a version error. | |
4019 | */ | |
4020 | continue; | |
4021 | } | |
b0a40d28 DG |
4022 | ua_sess = lookup_session_by_app(usess, app); |
4023 | if (ua_sess == NULL) { | |
4024 | /* Next app */ | |
4025 | continue; | |
4026 | } | |
4027 | ||
4028 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
4029 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4030 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 4031 | if (ua_chan_node == NULL) { |
d9bf3ca4 | 4032 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 4033 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
4034 | continue; |
4035 | } | |
4036 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4037 | ||
700c5a9d JR |
4038 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
4039 | uevent->filter, uevent->attr.loglevel, | |
4040 | uevent->exclusion); | |
4041 | if (ua_event == NULL) { | |
b0a40d28 | 4042 | DBG2("Event %s not found in channel %s for app pid %d." |
852d0037 | 4043 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
4044 | continue; |
4045 | } | |
b0a40d28 | 4046 | |
7f79d3a1 | 4047 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
4048 | if (ret < 0) { |
4049 | /* XXX: Report error someday... */ | |
4050 | continue; | |
4051 | } | |
4052 | } | |
4053 | ||
4054 | rcu_read_unlock(); | |
4055 | ||
4056 | return ret; | |
4057 | } | |
4058 | ||
421cb601 | 4059 | /* |
5b4a0ec0 | 4060 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 4061 | */ |
35a9059d | 4062 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
4063 | struct ltt_ust_channel *uchan) |
4064 | { | |
3d8ca23b | 4065 | int ret = 0, created; |
bec39940 | 4066 | struct lttng_ht_iter iter; |
48842b30 | 4067 | struct ust_app *app; |
3d8ca23b | 4068 | struct ust_app_session *ua_sess = NULL; |
48842b30 | 4069 | |
fc34caaa DG |
4070 | /* Very wrong code flow */ |
4071 | assert(usess); | |
4072 | assert(uchan); | |
421cb601 | 4073 | |
d9bf3ca4 | 4074 | DBG2("UST app adding channel %s to UST domain for session id %" PRIu64, |
a991f516 | 4075 | uchan->name, usess->id); |
48842b30 DG |
4076 | |
4077 | rcu_read_lock(); | |
421cb601 | 4078 | |
5b4a0ec0 | 4079 | /* For every registered applications */ |
852d0037 | 4080 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4081 | if (!app->compatible) { |
4082 | /* | |
4083 | * TODO: In time, we should notice the caller of this error by | |
4084 | * telling him that this is a version error. | |
4085 | */ | |
4086 | continue; | |
4087 | } | |
a9ad0c8f MD |
4088 | if (!trace_ust_pid_tracker_lookup(usess, app->pid)) { |
4089 | /* Skip. */ | |
4090 | continue; | |
4091 | } | |
4092 | ||
edb67388 DG |
4093 | /* |
4094 | * Create session on the tracer side and add it to app session HT. Note | |
4095 | * that if session exist, it will simply return a pointer to the ust | |
4096 | * app session. | |
4097 | */ | |
3d8ca23b DG |
4098 | ret = create_ust_app_session(usess, app, &ua_sess, &created); |
4099 | if (ret < 0) { | |
4100 | switch (ret) { | |
4101 | case -ENOTCONN: | |
4102 | /* | |
4103 | * The application's socket is not valid. Either a bad socket | |
4104 | * or a timeout on it. We can't inform the caller that for a | |
4105 | * specific app, the session failed so lets continue here. | |
4106 | */ | |
a7169585 | 4107 | ret = 0; /* Not an error. */ |
3d8ca23b DG |
4108 | continue; |
4109 | case -ENOMEM: | |
4110 | default: | |
4111 | goto error_rcu_unlock; | |
4112 | } | |
48842b30 | 4113 | } |
3d8ca23b | 4114 | assert(ua_sess); |
48842b30 | 4115 | |
d0b96690 | 4116 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
4117 | |
4118 | if (ua_sess->deleted) { | |
4119 | pthread_mutex_unlock(&ua_sess->lock); | |
4120 | continue; | |
4121 | } | |
4122 | ||
d65d2de8 DG |
4123 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, |
4124 | sizeof(uchan->name))) { | |
ad7a9107 DG |
4125 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, &uchan->attr); |
4126 | ret = 0; | |
d65d2de8 DG |
4127 | } else { |
4128 | /* Create channel onto application. We don't need the chan ref. */ | |
4129 | ret = create_ust_app_channel(ua_sess, uchan, app, | |
4130 | LTTNG_UST_CHAN_PER_CPU, usess, NULL); | |
4131 | } | |
d0b96690 | 4132 | pthread_mutex_unlock(&ua_sess->lock); |
3d8ca23b | 4133 | if (ret < 0) { |
3d8ca23b DG |
4134 | /* Cleanup the created session if it's the case. */ |
4135 | if (created) { | |
d0b96690 | 4136 | destroy_app_session(app, ua_sess); |
3d8ca23b | 4137 | } |
a7169585 MD |
4138 | switch (ret) { |
4139 | case -ENOTCONN: | |
4140 | /* | |
4141 | * The application's socket is not valid. Either a bad socket | |
4142 | * or a timeout on it. We can't inform the caller that for a | |
4143 | * specific app, the session failed so lets continue here. | |
4144 | */ | |
4145 | ret = 0; /* Not an error. */ | |
4146 | continue; | |
4147 | case -ENOMEM: | |
4148 | default: | |
4149 | goto error_rcu_unlock; | |
4150 | } | |
48842b30 | 4151 | } |
48842b30 | 4152 | } |
5b4a0ec0 | 4153 | |
95e047ff | 4154 | error_rcu_unlock: |
48842b30 | 4155 | rcu_read_unlock(); |
3c14c33f | 4156 | return ret; |
48842b30 DG |
4157 | } |
4158 | ||
5b4a0ec0 | 4159 | /* |
edb67388 | 4160 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 4161 | */ |
35a9059d | 4162 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
4163 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4164 | { | |
4165 | int ret = 0; | |
bec39940 | 4166 | struct lttng_ht_iter iter, uiter; |
18eace3b | 4167 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
4168 | struct ust_app *app; |
4169 | struct ust_app_session *ua_sess; | |
4170 | struct ust_app_channel *ua_chan; | |
4171 | struct ust_app_event *ua_event; | |
48842b30 | 4172 | |
d9bf3ca4 | 4173 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 4174 | uevent->attr.name, usess->id); |
48842b30 | 4175 | |
edb67388 DG |
4176 | /* |
4177 | * NOTE: At this point, this function is called only if the session and | |
4178 | * channel passed are already created for all apps. and enabled on the | |
4179 | * tracer also. | |
4180 | */ | |
4181 | ||
48842b30 | 4182 | rcu_read_lock(); |
421cb601 DG |
4183 | |
4184 | /* For all registered applications */ | |
852d0037 | 4185 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4186 | if (!app->compatible) { |
4187 | /* | |
4188 | * TODO: In time, we should notice the caller of this error by | |
4189 | * telling him that this is a version error. | |
4190 | */ | |
4191 | continue; | |
4192 | } | |
edb67388 | 4193 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4194 | if (!ua_sess) { |
4195 | /* The application has problem or is probably dead. */ | |
4196 | continue; | |
4197 | } | |
ba767faf | 4198 | |
d0b96690 DG |
4199 | pthread_mutex_lock(&ua_sess->lock); |
4200 | ||
b161602a MD |
4201 | if (ua_sess->deleted) { |
4202 | pthread_mutex_unlock(&ua_sess->lock); | |
4203 | continue; | |
4204 | } | |
4205 | ||
edb67388 | 4206 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4207 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4208 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
a7169585 MD |
4209 | /* |
4210 | * It is possible that the channel cannot be found is | |
4211 | * the channel/event creation occurs concurrently with | |
4212 | * an application exit. | |
4213 | */ | |
4214 | if (!ua_chan_node) { | |
4215 | pthread_mutex_unlock(&ua_sess->lock); | |
4216 | continue; | |
4217 | } | |
edb67388 DG |
4218 | |
4219 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4220 | ||
18eace3b DG |
4221 | /* Get event node */ |
4222 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
39c5a3a7 | 4223 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 4224 | if (ua_event == NULL) { |
7f79d3a1 | 4225 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 4226 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 4227 | goto next_app; |
35a9059d | 4228 | } |
35a9059d DG |
4229 | |
4230 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
4231 | if (ret < 0) { | |
d0b96690 | 4232 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 4233 | goto error; |
48842b30 | 4234 | } |
d0b96690 DG |
4235 | next_app: |
4236 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
4237 | } |
4238 | ||
7f79d3a1 | 4239 | error: |
edb67388 | 4240 | rcu_read_unlock(); |
edb67388 DG |
4241 | return ret; |
4242 | } | |
4243 | ||
4244 | /* | |
4245 | * For a specific existing UST session and UST channel, creates the event for | |
4246 | * all registered apps. | |
4247 | */ | |
35a9059d | 4248 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
4249 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4250 | { | |
4251 | int ret = 0; | |
bec39940 DG |
4252 | struct lttng_ht_iter iter, uiter; |
4253 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
4254 | struct ust_app *app; |
4255 | struct ust_app_session *ua_sess; | |
4256 | struct ust_app_channel *ua_chan; | |
4257 | ||
d9bf3ca4 | 4258 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 4259 | uevent->attr.name, usess->id); |
edb67388 | 4260 | |
edb67388 DG |
4261 | rcu_read_lock(); |
4262 | ||
4263 | /* For all registered applications */ | |
852d0037 | 4264 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4265 | if (!app->compatible) { |
4266 | /* | |
4267 | * TODO: In time, we should notice the caller of this error by | |
4268 | * telling him that this is a version error. | |
4269 | */ | |
4270 | continue; | |
4271 | } | |
edb67388 | 4272 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4273 | if (!ua_sess) { |
4274 | /* The application has problem or is probably dead. */ | |
4275 | continue; | |
4276 | } | |
48842b30 | 4277 | |
d0b96690 | 4278 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
4279 | |
4280 | if (ua_sess->deleted) { | |
4281 | pthread_mutex_unlock(&ua_sess->lock); | |
4282 | continue; | |
4283 | } | |
4284 | ||
48842b30 | 4285 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4286 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4287 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
4288 | /* If the channel is not found, there is a code flow error */ |
4289 | assert(ua_chan_node); | |
4290 | ||
48842b30 DG |
4291 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
4292 | ||
edb67388 | 4293 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 4294 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 4295 | if (ret < 0) { |
49c336c1 | 4296 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
4297 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
4298 | break; | |
4299 | } | |
4300 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 4301 | uevent->attr.name, app->pid); |
5b4a0ec0 | 4302 | continue; |
48842b30 | 4303 | } |
48842b30 | 4304 | } |
5b4a0ec0 | 4305 | |
48842b30 DG |
4306 | rcu_read_unlock(); |
4307 | ||
4308 | return ret; | |
4309 | } | |
4310 | ||
5b4a0ec0 DG |
4311 | /* |
4312 | * Start tracing for a specific UST session and app. | |
4313 | */ | |
b34cbebf | 4314 | static |
421cb601 | 4315 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
4316 | { |
4317 | int ret = 0; | |
48842b30 | 4318 | struct ust_app_session *ua_sess; |
48842b30 | 4319 | |
852d0037 | 4320 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 4321 | |
509cbaf8 MD |
4322 | rcu_read_lock(); |
4323 | ||
e0c7ec2b DG |
4324 | if (!app->compatible) { |
4325 | goto end; | |
4326 | } | |
4327 | ||
421cb601 DG |
4328 | ua_sess = lookup_session_by_app(usess, app); |
4329 | if (ua_sess == NULL) { | |
d42f20df DG |
4330 | /* The session is in teardown process. Ignore and continue. */ |
4331 | goto end; | |
421cb601 | 4332 | } |
48842b30 | 4333 | |
d0b96690 DG |
4334 | pthread_mutex_lock(&ua_sess->lock); |
4335 | ||
b161602a MD |
4336 | if (ua_sess->deleted) { |
4337 | pthread_mutex_unlock(&ua_sess->lock); | |
4338 | goto end; | |
4339 | } | |
4340 | ||
aea829b3 DG |
4341 | /* Upon restart, we skip the setup, already done */ |
4342 | if (ua_sess->started) { | |
8be98f9a | 4343 | goto skip_setup; |
aea829b3 | 4344 | } |
8be98f9a | 4345 | |
a4b92340 DG |
4346 | /* Create directories if consumer is LOCAL and has a path defined. */ |
4347 | if (usess->consumer->type == CONSUMER_DST_LOCAL && | |
4348 | strlen(usess->consumer->dst.trace_path) > 0) { | |
4349 | ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path, | |
7972aab2 | 4350 | S_IRWXU | S_IRWXG, ua_sess->euid, ua_sess->egid); |
a4b92340 | 4351 | if (ret < 0) { |
df5b86c8 | 4352 | if (errno != EEXIST) { |
a4b92340 | 4353 | ERR("Trace directory creation error"); |
d0b96690 | 4354 | goto error_unlock; |
421cb601 | 4355 | } |
173af62f | 4356 | } |
7753dea8 | 4357 | } |
aea829b3 | 4358 | |
d65d2de8 DG |
4359 | /* |
4360 | * Create the metadata for the application. This returns gracefully if a | |
4361 | * metadata was already set for the session. | |
4362 | */ | |
ad7a9107 | 4363 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer); |
421cb601 | 4364 | if (ret < 0) { |
d0b96690 | 4365 | goto error_unlock; |
421cb601 | 4366 | } |
48842b30 | 4367 | |
840cb59c | 4368 | health_code_update(); |
86acf0da | 4369 | |
8be98f9a | 4370 | skip_setup: |
421cb601 | 4371 | /* This start the UST tracing */ |
fb45065e | 4372 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4373 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
fb45065e | 4374 | pthread_mutex_unlock(&app->sock_lock); |
421cb601 | 4375 | if (ret < 0) { |
ffe60014 DG |
4376 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4377 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
4378 | app->pid, ret); | |
4379 | } else { | |
4380 | DBG("UST app start session failed. Application is dead."); | |
3757b385 DG |
4381 | /* |
4382 | * This is normal behavior, an application can die during the | |
4383 | * creation process. Don't report an error so the execution can | |
4384 | * continue normally. | |
4385 | */ | |
4386 | pthread_mutex_unlock(&ua_sess->lock); | |
4387 | goto end; | |
ffe60014 | 4388 | } |
d0b96690 | 4389 | goto error_unlock; |
421cb601 | 4390 | } |
5b4a0ec0 | 4391 | |
55c3953d DG |
4392 | /* Indicate that the session has been started once */ |
4393 | ua_sess->started = 1; | |
4394 | ||
d0b96690 DG |
4395 | pthread_mutex_unlock(&ua_sess->lock); |
4396 | ||
840cb59c | 4397 | health_code_update(); |
86acf0da | 4398 | |
421cb601 | 4399 | /* Quiescent wait after starting trace */ |
fb45065e | 4400 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4401 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4402 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4403 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4404 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4405 | app->pid, ret); | |
4406 | } | |
48842b30 | 4407 | |
e0c7ec2b DG |
4408 | end: |
4409 | rcu_read_unlock(); | |
840cb59c | 4410 | health_code_update(); |
421cb601 | 4411 | return 0; |
48842b30 | 4412 | |
d0b96690 DG |
4413 | error_unlock: |
4414 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 4415 | rcu_read_unlock(); |
840cb59c | 4416 | health_code_update(); |
421cb601 DG |
4417 | return -1; |
4418 | } | |
48842b30 | 4419 | |
8be98f9a MD |
4420 | /* |
4421 | * Stop tracing for a specific UST session and app. | |
4422 | */ | |
b34cbebf | 4423 | static |
8be98f9a MD |
4424 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
4425 | { | |
4426 | int ret = 0; | |
4427 | struct ust_app_session *ua_sess; | |
7972aab2 | 4428 | struct ust_registry_session *registry; |
8be98f9a | 4429 | |
852d0037 | 4430 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
4431 | |
4432 | rcu_read_lock(); | |
4433 | ||
e0c7ec2b | 4434 | if (!app->compatible) { |
d88aee68 | 4435 | goto end_no_session; |
e0c7ec2b DG |
4436 | } |
4437 | ||
8be98f9a MD |
4438 | ua_sess = lookup_session_by_app(usess, app); |
4439 | if (ua_sess == NULL) { | |
d88aee68 | 4440 | goto end_no_session; |
8be98f9a MD |
4441 | } |
4442 | ||
d88aee68 DG |
4443 | pthread_mutex_lock(&ua_sess->lock); |
4444 | ||
b161602a MD |
4445 | if (ua_sess->deleted) { |
4446 | pthread_mutex_unlock(&ua_sess->lock); | |
4447 | goto end_no_session; | |
4448 | } | |
4449 | ||
9bc07046 DG |
4450 | /* |
4451 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
4452 | * that was never started. It's possible since we can have a fail start |
4453 | * from either the application manager thread or the command thread. Simply | |
4454 | * indicate that this is a stop error. | |
9bc07046 | 4455 | */ |
f9dfc3d9 | 4456 | if (!ua_sess->started) { |
c45536e1 DG |
4457 | goto error_rcu_unlock; |
4458 | } | |
7db205b5 | 4459 | |
840cb59c | 4460 | health_code_update(); |
86acf0da | 4461 | |
9d6c7d3f | 4462 | /* This inhibits UST tracing */ |
fb45065e | 4463 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4464 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
fb45065e | 4465 | pthread_mutex_unlock(&app->sock_lock); |
9d6c7d3f | 4466 | if (ret < 0) { |
ffe60014 DG |
4467 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4468 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
4469 | app->pid, ret); | |
4470 | } else { | |
4471 | DBG("UST app stop session failed. Application is dead."); | |
3757b385 DG |
4472 | /* |
4473 | * This is normal behavior, an application can die during the | |
4474 | * creation process. Don't report an error so the execution can | |
4475 | * continue normally. | |
4476 | */ | |
4477 | goto end_unlock; | |
ffe60014 | 4478 | } |
9d6c7d3f DG |
4479 | goto error_rcu_unlock; |
4480 | } | |
4481 | ||
840cb59c | 4482 | health_code_update(); |
86acf0da | 4483 | |
9d6c7d3f | 4484 | /* Quiescent wait after stopping trace */ |
fb45065e | 4485 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4486 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4487 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4488 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4489 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4490 | app->pid, ret); | |
4491 | } | |
9d6c7d3f | 4492 | |
840cb59c | 4493 | health_code_update(); |
86acf0da | 4494 | |
b34cbebf MD |
4495 | registry = get_session_registry(ua_sess); |
4496 | assert(registry); | |
1b532a60 | 4497 | |
ce34fcd0 MD |
4498 | /* Push metadata for application before freeing the application. */ |
4499 | (void) push_metadata(registry, ua_sess->consumer); | |
b34cbebf | 4500 | |
3757b385 | 4501 | end_unlock: |
b34cbebf MD |
4502 | pthread_mutex_unlock(&ua_sess->lock); |
4503 | end_no_session: | |
4504 | rcu_read_unlock(); | |
4505 | health_code_update(); | |
4506 | return 0; | |
4507 | ||
4508 | error_rcu_unlock: | |
4509 | pthread_mutex_unlock(&ua_sess->lock); | |
4510 | rcu_read_unlock(); | |
4511 | health_code_update(); | |
4512 | return -1; | |
4513 | } | |
4514 | ||
b34cbebf | 4515 | static |
c4b88406 MD |
4516 | int ust_app_flush_app_session(struct ust_app *app, |
4517 | struct ust_app_session *ua_sess) | |
b34cbebf | 4518 | { |
c4b88406 | 4519 | int ret, retval = 0; |
b34cbebf | 4520 | struct lttng_ht_iter iter; |
b34cbebf | 4521 | struct ust_app_channel *ua_chan; |
c4b88406 | 4522 | struct consumer_socket *socket; |
b34cbebf | 4523 | |
c4b88406 | 4524 | DBG("Flushing app session buffers for ust app pid %d", app->pid); |
b34cbebf MD |
4525 | |
4526 | rcu_read_lock(); | |
4527 | ||
4528 | if (!app->compatible) { | |
c4b88406 | 4529 | goto end_not_compatible; |
b34cbebf MD |
4530 | } |
4531 | ||
4532 | pthread_mutex_lock(&ua_sess->lock); | |
4533 | ||
b161602a MD |
4534 | if (ua_sess->deleted) { |
4535 | goto end_deleted; | |
4536 | } | |
4537 | ||
b34cbebf MD |
4538 | health_code_update(); |
4539 | ||
9d6c7d3f | 4540 | /* Flushing buffers */ |
c4b88406 MD |
4541 | socket = consumer_find_socket_by_bitness(app->bits_per_long, |
4542 | ua_sess->consumer); | |
ce34fcd0 MD |
4543 | |
4544 | /* Flush buffers and push metadata. */ | |
4545 | switch (ua_sess->buffer_type) { | |
4546 | case LTTNG_BUFFER_PER_PID: | |
4547 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, | |
4548 | node.node) { | |
4549 | health_code_update(); | |
ce34fcd0 MD |
4550 | ret = consumer_flush_channel(socket, ua_chan->key); |
4551 | if (ret) { | |
4552 | ERR("Error flushing consumer channel"); | |
4553 | retval = -1; | |
4554 | continue; | |
4555 | } | |
8be98f9a | 4556 | } |
ce34fcd0 MD |
4557 | break; |
4558 | case LTTNG_BUFFER_PER_UID: | |
4559 | default: | |
4560 | assert(0); | |
4561 | break; | |
8be98f9a | 4562 | } |
8be98f9a | 4563 | |
840cb59c | 4564 | health_code_update(); |
86acf0da | 4565 | |
b161602a | 4566 | end_deleted: |
d88aee68 | 4567 | pthread_mutex_unlock(&ua_sess->lock); |
ce34fcd0 | 4568 | |
c4b88406 MD |
4569 | end_not_compatible: |
4570 | rcu_read_unlock(); | |
4571 | health_code_update(); | |
4572 | return retval; | |
4573 | } | |
4574 | ||
4575 | /* | |
ce34fcd0 MD |
4576 | * Flush buffers for all applications for a specific UST session. |
4577 | * Called with UST session lock held. | |
c4b88406 MD |
4578 | */ |
4579 | static | |
ce34fcd0 | 4580 | int ust_app_flush_session(struct ltt_ust_session *usess) |
c4b88406 MD |
4581 | |
4582 | { | |
99b1411c | 4583 | int ret = 0; |
c4b88406 | 4584 | |
ce34fcd0 | 4585 | DBG("Flushing session buffers for all ust apps"); |
c4b88406 MD |
4586 | |
4587 | rcu_read_lock(); | |
4588 | ||
ce34fcd0 MD |
4589 | /* Flush buffers and push metadata. */ |
4590 | switch (usess->buffer_type) { | |
4591 | case LTTNG_BUFFER_PER_UID: | |
4592 | { | |
4593 | struct buffer_reg_uid *reg; | |
4594 | struct lttng_ht_iter iter; | |
4595 | ||
4596 | /* Flush all per UID buffers associated to that session. */ | |
4597 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
4598 | struct ust_registry_session *ust_session_reg; | |
4599 | struct buffer_reg_channel *reg_chan; | |
4600 | struct consumer_socket *socket; | |
4601 | ||
4602 | /* Get consumer socket to use to push the metadata.*/ | |
4603 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
4604 | usess->consumer); | |
4605 | if (!socket) { | |
4606 | /* Ignore request if no consumer is found for the session. */ | |
4607 | continue; | |
4608 | } | |
4609 | ||
4610 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
4611 | reg_chan, node.node) { | |
4612 | /* | |
4613 | * The following call will print error values so the return | |
4614 | * code is of little importance because whatever happens, we | |
4615 | * have to try them all. | |
4616 | */ | |
4617 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
4618 | } | |
4619 | ||
4620 | ust_session_reg = reg->registry->reg.ust; | |
4621 | /* Push metadata. */ | |
4622 | (void) push_metadata(ust_session_reg, usess->consumer); | |
4623 | } | |
ce34fcd0 MD |
4624 | break; |
4625 | } | |
4626 | case LTTNG_BUFFER_PER_PID: | |
4627 | { | |
4628 | struct ust_app_session *ua_sess; | |
4629 | struct lttng_ht_iter iter; | |
4630 | struct ust_app *app; | |
4631 | ||
4632 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4633 | ua_sess = lookup_session_by_app(usess, app); | |
4634 | if (ua_sess == NULL) { | |
4635 | continue; | |
4636 | } | |
4637 | (void) ust_app_flush_app_session(app, ua_sess); | |
4638 | } | |
4639 | break; | |
4640 | } | |
4641 | default: | |
99b1411c | 4642 | ret = -1; |
ce34fcd0 MD |
4643 | assert(0); |
4644 | break; | |
c4b88406 | 4645 | } |
c4b88406 | 4646 | |
7db205b5 | 4647 | rcu_read_unlock(); |
840cb59c | 4648 | health_code_update(); |
c4b88406 | 4649 | return ret; |
8be98f9a MD |
4650 | } |
4651 | ||
84cd17c6 MD |
4652 | /* |
4653 | * Destroy a specific UST session in apps. | |
4654 | */ | |
3353de95 | 4655 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 4656 | { |
ffe60014 | 4657 | int ret; |
84cd17c6 | 4658 | struct ust_app_session *ua_sess; |
bec39940 | 4659 | struct lttng_ht_iter iter; |
d9bf3ca4 | 4660 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 4661 | |
852d0037 | 4662 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
4663 | |
4664 | rcu_read_lock(); | |
4665 | ||
e0c7ec2b DG |
4666 | if (!app->compatible) { |
4667 | goto end; | |
4668 | } | |
4669 | ||
84cd17c6 | 4670 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 4671 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 4672 | if (node == NULL) { |
d42f20df DG |
4673 | /* Session is being or is deleted. */ |
4674 | goto end; | |
84cd17c6 MD |
4675 | } |
4676 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 4677 | |
840cb59c | 4678 | health_code_update(); |
d0b96690 | 4679 | destroy_app_session(app, ua_sess); |
84cd17c6 | 4680 | |
840cb59c | 4681 | health_code_update(); |
7db205b5 | 4682 | |
84cd17c6 | 4683 | /* Quiescent wait after stopping trace */ |
fb45065e | 4684 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4685 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4686 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4687 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4688 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4689 | app->pid, ret); | |
4690 | } | |
e0c7ec2b DG |
4691 | end: |
4692 | rcu_read_unlock(); | |
840cb59c | 4693 | health_code_update(); |
84cd17c6 | 4694 | return 0; |
84cd17c6 MD |
4695 | } |
4696 | ||
5b4a0ec0 DG |
4697 | /* |
4698 | * Start tracing for the UST session. | |
4699 | */ | |
421cb601 DG |
4700 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
4701 | { | |
4702 | int ret = 0; | |
bec39940 | 4703 | struct lttng_ht_iter iter; |
421cb601 | 4704 | struct ust_app *app; |
48842b30 | 4705 | |
421cb601 DG |
4706 | DBG("Starting all UST traces"); |
4707 | ||
4708 | rcu_read_lock(); | |
421cb601 | 4709 | |
852d0037 | 4710 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
421cb601 | 4711 | ret = ust_app_start_trace(usess, app); |
48842b30 | 4712 | if (ret < 0) { |
5b4a0ec0 DG |
4713 | /* Continue to next apps even on error */ |
4714 | continue; | |
48842b30 | 4715 | } |
48842b30 | 4716 | } |
5b4a0ec0 | 4717 | |
48842b30 DG |
4718 | rcu_read_unlock(); |
4719 | ||
4720 | return 0; | |
4721 | } | |
487cf67c | 4722 | |
8be98f9a MD |
4723 | /* |
4724 | * Start tracing for the UST session. | |
ce34fcd0 | 4725 | * Called with UST session lock held. |
8be98f9a MD |
4726 | */ |
4727 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
4728 | { | |
4729 | int ret = 0; | |
bec39940 | 4730 | struct lttng_ht_iter iter; |
8be98f9a MD |
4731 | struct ust_app *app; |
4732 | ||
4733 | DBG("Stopping all UST traces"); | |
4734 | ||
4735 | rcu_read_lock(); | |
4736 | ||
b34cbebf MD |
4737 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4738 | ret = ust_app_stop_trace(usess, app); | |
4739 | if (ret < 0) { | |
4740 | /* Continue to next apps even on error */ | |
4741 | continue; | |
4742 | } | |
4743 | } | |
4744 | ||
ce34fcd0 | 4745 | (void) ust_app_flush_session(usess); |
8be98f9a MD |
4746 | |
4747 | rcu_read_unlock(); | |
4748 | ||
4749 | return 0; | |
4750 | } | |
4751 | ||
84cd17c6 MD |
4752 | /* |
4753 | * Destroy app UST session. | |
4754 | */ | |
4755 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
4756 | { | |
4757 | int ret = 0; | |
bec39940 | 4758 | struct lttng_ht_iter iter; |
84cd17c6 MD |
4759 | struct ust_app *app; |
4760 | ||
4761 | DBG("Destroy all UST traces"); | |
4762 | ||
4763 | rcu_read_lock(); | |
4764 | ||
852d0037 | 4765 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 4766 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
4767 | if (ret < 0) { |
4768 | /* Continue to next apps even on error */ | |
4769 | continue; | |
4770 | } | |
4771 | } | |
4772 | ||
4773 | rcu_read_unlock(); | |
4774 | ||
4775 | return 0; | |
4776 | } | |
4777 | ||
a9ad0c8f MD |
4778 | static |
4779 | void ust_app_global_create(struct ltt_ust_session *usess, struct ust_app *app) | |
487cf67c | 4780 | { |
55c54cce | 4781 | int ret = 0; |
31746f93 | 4782 | struct lttng_ht_iter iter, uiter; |
3d8ca23b | 4783 | struct ust_app_session *ua_sess = NULL; |
487cf67c DG |
4784 | struct ust_app_channel *ua_chan; |
4785 | struct ust_app_event *ua_event; | |
727d5404 | 4786 | struct ust_app_ctx *ua_ctx; |
a9ad0c8f | 4787 | int is_created = 0; |
1f3580c7 | 4788 | |
a9ad0c8f | 4789 | ret = create_ust_app_session(usess, app, &ua_sess, &is_created); |
3d8ca23b DG |
4790 | if (ret < 0) { |
4791 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
4792 | goto error; |
4793 | } | |
a9ad0c8f MD |
4794 | if (!is_created) { |
4795 | /* App session already created. */ | |
4796 | goto end; | |
4797 | } | |
3d8ca23b | 4798 | assert(ua_sess); |
487cf67c | 4799 | |
d0b96690 DG |
4800 | pthread_mutex_lock(&ua_sess->lock); |
4801 | ||
b161602a MD |
4802 | if (ua_sess->deleted) { |
4803 | pthread_mutex_unlock(&ua_sess->lock); | |
4804 | goto end; | |
4805 | } | |
4806 | ||
284d8f55 | 4807 | /* |
d0b96690 | 4808 | * We can iterate safely here over all UST app session since the create ust |
284d8f55 DG |
4809 | * app session above made a shadow copy of the UST global domain from the |
4810 | * ltt ust session. | |
4811 | */ | |
bec39940 DG |
4812 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
4813 | node.node) { | |
ad7a9107 | 4814 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
a7169585 | 4815 | if (ret < 0 && ret != -ENOTCONN) { |
ad7a9107 | 4816 | /* |
a7169585 MD |
4817 | * Stop everything. On error, the application |
4818 | * failed, no more file descriptor are available | |
4819 | * or ENOMEM so stopping here is the only thing | |
4820 | * we can do for now. The only exception is | |
4821 | * -ENOTCONN, which indicates that the application | |
4822 | * has exit. | |
ad7a9107 DG |
4823 | */ |
4824 | goto error_unlock; | |
487cf67c DG |
4825 | } |
4826 | ||
31746f93 DG |
4827 | /* |
4828 | * Add context using the list so they are enabled in the same order the | |
4829 | * user added them. | |
4830 | */ | |
4831 | cds_list_for_each_entry(ua_ctx, &ua_chan->ctx_list, list) { | |
727d5404 DG |
4832 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); |
4833 | if (ret < 0) { | |
d0b96690 | 4834 | goto error_unlock; |
727d5404 DG |
4835 | } |
4836 | } | |
4837 | ||
4838 | ||
284d8f55 | 4839 | /* For each events */ |
bec39940 DG |
4840 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
4841 | node.node) { | |
284d8f55 DG |
4842 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
4843 | if (ret < 0) { | |
d0b96690 | 4844 | goto error_unlock; |
487cf67c | 4845 | } |
36dc12cc | 4846 | } |
487cf67c DG |
4847 | } |
4848 | ||
d0b96690 DG |
4849 | pthread_mutex_unlock(&ua_sess->lock); |
4850 | ||
14fb1ebe | 4851 | if (usess->active) { |
421cb601 | 4852 | ret = ust_app_start_trace(usess, app); |
36dc12cc | 4853 | if (ret < 0) { |
36dc12cc DG |
4854 | goto error; |
4855 | } | |
4856 | ||
852d0037 | 4857 | DBG2("UST trace started for app pid %d", app->pid); |
36dc12cc | 4858 | } |
a9ad0c8f | 4859 | end: |
ffe60014 | 4860 | /* Everything went well at this point. */ |
ffe60014 DG |
4861 | return; |
4862 | ||
d0b96690 DG |
4863 | error_unlock: |
4864 | pthread_mutex_unlock(&ua_sess->lock); | |
487cf67c | 4865 | error: |
ffe60014 | 4866 | if (ua_sess) { |
d0b96690 | 4867 | destroy_app_session(app, ua_sess); |
ffe60014 | 4868 | } |
487cf67c DG |
4869 | return; |
4870 | } | |
55cc08a6 | 4871 | |
a9ad0c8f MD |
4872 | static |
4873 | void ust_app_global_destroy(struct ltt_ust_session *usess, struct ust_app *app) | |
4874 | { | |
4875 | struct ust_app_session *ua_sess; | |
4876 | ||
4877 | ua_sess = lookup_session_by_app(usess, app); | |
4878 | if (ua_sess == NULL) { | |
4879 | return; | |
4880 | } | |
4881 | destroy_app_session(app, ua_sess); | |
4882 | } | |
4883 | ||
4884 | /* | |
4885 | * Add channels/events from UST global domain to registered apps at sock. | |
4886 | * | |
4887 | * Called with session lock held. | |
4888 | * Called with RCU read-side lock held. | |
4889 | */ | |
4890 | void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app) | |
4891 | { | |
4892 | assert(usess); | |
4893 | ||
4894 | DBG2("UST app global update for app sock %d for session id %" PRIu64, | |
4895 | app->sock, usess->id); | |
4896 | ||
4897 | if (!app->compatible) { | |
4898 | return; | |
4899 | } | |
4900 | ||
4901 | if (trace_ust_pid_tracker_lookup(usess, app->pid)) { | |
4902 | ust_app_global_create(usess, app); | |
4903 | } else { | |
4904 | ust_app_global_destroy(usess, app); | |
4905 | } | |
4906 | } | |
4907 | ||
4908 | /* | |
4909 | * Called with session lock held. | |
4910 | */ | |
4911 | void ust_app_global_update_all(struct ltt_ust_session *usess) | |
4912 | { | |
4913 | struct lttng_ht_iter iter; | |
4914 | struct ust_app *app; | |
4915 | ||
4916 | rcu_read_lock(); | |
4917 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4918 | ust_app_global_update(usess, app); | |
4919 | } | |
4920 | rcu_read_unlock(); | |
4921 | } | |
4922 | ||
55cc08a6 DG |
4923 | /* |
4924 | * Add context to a specific channel for global UST domain. | |
4925 | */ | |
4926 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
4927 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
4928 | { | |
4929 | int ret = 0; | |
bec39940 DG |
4930 | struct lttng_ht_node_str *ua_chan_node; |
4931 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
4932 | struct ust_app_channel *ua_chan = NULL; |
4933 | struct ust_app_session *ua_sess; | |
4934 | struct ust_app *app; | |
4935 | ||
4936 | rcu_read_lock(); | |
4937 | ||
852d0037 | 4938 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4939 | if (!app->compatible) { |
4940 | /* | |
4941 | * TODO: In time, we should notice the caller of this error by | |
4942 | * telling him that this is a version error. | |
4943 | */ | |
4944 | continue; | |
4945 | } | |
55cc08a6 DG |
4946 | ua_sess = lookup_session_by_app(usess, app); |
4947 | if (ua_sess == NULL) { | |
4948 | continue; | |
4949 | } | |
4950 | ||
d0b96690 | 4951 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
4952 | |
4953 | if (ua_sess->deleted) { | |
4954 | pthread_mutex_unlock(&ua_sess->lock); | |
4955 | continue; | |
4956 | } | |
4957 | ||
55cc08a6 | 4958 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4959 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4960 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 4961 | if (ua_chan_node == NULL) { |
d0b96690 | 4962 | goto next_app; |
55cc08a6 DG |
4963 | } |
4964 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
4965 | node); | |
55cc08a6 DG |
4966 | ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app); |
4967 | if (ret < 0) { | |
d0b96690 | 4968 | goto next_app; |
55cc08a6 | 4969 | } |
d0b96690 DG |
4970 | next_app: |
4971 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
4972 | } |
4973 | ||
55cc08a6 DG |
4974 | rcu_read_unlock(); |
4975 | return ret; | |
4976 | } | |
4977 | ||
76d45b40 DG |
4978 | /* |
4979 | * Enable event for a channel from a UST session for a specific PID. | |
4980 | */ | |
4981 | int ust_app_enable_event_pid(struct ltt_ust_session *usess, | |
4982 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4983 | { | |
4984 | int ret = 0; | |
bec39940 | 4985 | struct lttng_ht_iter iter; |
18eace3b | 4986 | struct lttng_ht_node_str *ua_chan_node; |
76d45b40 DG |
4987 | struct ust_app *app; |
4988 | struct ust_app_session *ua_sess; | |
4989 | struct ust_app_channel *ua_chan; | |
4990 | struct ust_app_event *ua_event; | |
4991 | ||
4992 | DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid); | |
4993 | ||
4994 | rcu_read_lock(); | |
4995 | ||
4996 | app = ust_app_find_by_pid(pid); | |
4997 | if (app == NULL) { | |
4998 | ERR("UST app enable event per PID %d not found", pid); | |
4999 | ret = -1; | |
d0b96690 | 5000 | goto end; |
76d45b40 DG |
5001 | } |
5002 | ||
e0c7ec2b DG |
5003 | if (!app->compatible) { |
5004 | ret = 0; | |
d0b96690 | 5005 | goto end; |
e0c7ec2b DG |
5006 | } |
5007 | ||
76d45b40 | 5008 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
5009 | if (!ua_sess) { |
5010 | /* The application has problem or is probably dead. */ | |
d0b96690 DG |
5011 | ret = 0; |
5012 | goto end; | |
c4a1715b | 5013 | } |
76d45b40 | 5014 | |
d0b96690 | 5015 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
5016 | |
5017 | if (ua_sess->deleted) { | |
5018 | ret = 0; | |
5019 | goto end_unlock; | |
5020 | } | |
5021 | ||
76d45b40 | 5022 | /* Lookup channel in the ust app session */ |
bec39940 DG |
5023 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
5024 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
76d45b40 DG |
5025 | /* If the channel is not found, there is a code flow error */ |
5026 | assert(ua_chan_node); | |
5027 | ||
5028 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
5029 | ||
18eace3b | 5030 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 5031 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 5032 | if (ua_event == NULL) { |
76d45b40 DG |
5033 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
5034 | if (ret < 0) { | |
d0b96690 | 5035 | goto end_unlock; |
76d45b40 DG |
5036 | } |
5037 | } else { | |
76d45b40 DG |
5038 | ret = enable_ust_app_event(ua_sess, ua_event, app); |
5039 | if (ret < 0) { | |
d0b96690 | 5040 | goto end_unlock; |
76d45b40 DG |
5041 | } |
5042 | } | |
5043 | ||
d0b96690 DG |
5044 | end_unlock: |
5045 | pthread_mutex_unlock(&ua_sess->lock); | |
5046 | end: | |
76d45b40 DG |
5047 | rcu_read_unlock(); |
5048 | return ret; | |
5049 | } | |
7f79d3a1 | 5050 | |
4466912f DG |
5051 | /* |
5052 | * Calibrate registered applications. | |
5053 | */ | |
5054 | int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate) | |
5055 | { | |
5056 | int ret = 0; | |
5057 | struct lttng_ht_iter iter; | |
5058 | struct ust_app *app; | |
5059 | ||
5060 | rcu_read_lock(); | |
5061 | ||
852d0037 | 5062 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4466912f DG |
5063 | if (!app->compatible) { |
5064 | /* | |
5065 | * TODO: In time, we should notice the caller of this error by | |
5066 | * telling him that this is a version error. | |
5067 | */ | |
5068 | continue; | |
5069 | } | |
5070 | ||
840cb59c | 5071 | health_code_update(); |
86acf0da | 5072 | |
fb45065e | 5073 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 5074 | ret = ustctl_calibrate(app->sock, calibrate); |
fb45065e | 5075 | pthread_mutex_unlock(&app->sock_lock); |
4466912f DG |
5076 | if (ret < 0) { |
5077 | switch (ret) { | |
5078 | case -ENOSYS: | |
5079 | /* Means that it's not implemented on the tracer side. */ | |
5080 | ret = 0; | |
5081 | break; | |
5082 | default: | |
4466912f | 5083 | DBG2("Calibrate app PID %d returned with error %d", |
852d0037 | 5084 | app->pid, ret); |
4466912f DG |
5085 | break; |
5086 | } | |
5087 | } | |
5088 | } | |
5089 | ||
5090 | DBG("UST app global domain calibration finished"); | |
5091 | ||
5092 | rcu_read_unlock(); | |
5093 | ||
840cb59c | 5094 | health_code_update(); |
86acf0da | 5095 | |
4466912f DG |
5096 | return ret; |
5097 | } | |
d0b96690 DG |
5098 | |
5099 | /* | |
5100 | * Receive registration and populate the given msg structure. | |
5101 | * | |
5102 | * On success return 0 else a negative value returned by the ustctl call. | |
5103 | */ | |
5104 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
5105 | { | |
5106 | int ret; | |
5107 | uint32_t pid, ppid, uid, gid; | |
5108 | ||
5109 | assert(msg); | |
5110 | ||
5111 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
5112 | &pid, &ppid, &uid, &gid, | |
5113 | &msg->bits_per_long, | |
5114 | &msg->uint8_t_alignment, | |
5115 | &msg->uint16_t_alignment, | |
5116 | &msg->uint32_t_alignment, | |
5117 | &msg->uint64_t_alignment, | |
5118 | &msg->long_alignment, | |
5119 | &msg->byte_order, | |
5120 | msg->name); | |
5121 | if (ret < 0) { | |
5122 | switch (-ret) { | |
5123 | case EPIPE: | |
5124 | case ECONNRESET: | |
5125 | case LTTNG_UST_ERR_EXITING: | |
5126 | DBG3("UST app recv reg message failed. Application died"); | |
5127 | break; | |
5128 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
5129 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
5130 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
5131 | LTTNG_UST_ABI_MINOR_VERSION); | |
5132 | break; | |
5133 | default: | |
5134 | ERR("UST app recv reg message failed with ret %d", ret); | |
5135 | break; | |
5136 | } | |
5137 | goto error; | |
5138 | } | |
5139 | msg->pid = (pid_t) pid; | |
5140 | msg->ppid = (pid_t) ppid; | |
5141 | msg->uid = (uid_t) uid; | |
5142 | msg->gid = (gid_t) gid; | |
5143 | ||
5144 | error: | |
5145 | return ret; | |
5146 | } | |
5147 | ||
10b56aef MD |
5148 | /* |
5149 | * Return a ust app session object using the application object and the | |
5150 | * session object descriptor has a key. If not found, NULL is returned. | |
5151 | * A RCU read side lock MUST be acquired when calling this function. | |
5152 | */ | |
5153 | static struct ust_app_session *find_session_by_objd(struct ust_app *app, | |
5154 | int objd) | |
5155 | { | |
5156 | struct lttng_ht_node_ulong *node; | |
5157 | struct lttng_ht_iter iter; | |
5158 | struct ust_app_session *ua_sess = NULL; | |
5159 | ||
5160 | assert(app); | |
5161 | ||
5162 | lttng_ht_lookup(app->ust_sessions_objd, (void *)((unsigned long) objd), &iter); | |
5163 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5164 | if (node == NULL) { | |
5165 | DBG2("UST app session find by objd %d not found", objd); | |
5166 | goto error; | |
5167 | } | |
5168 | ||
5169 | ua_sess = caa_container_of(node, struct ust_app_session, ust_objd_node); | |
5170 | ||
5171 | error: | |
5172 | return ua_sess; | |
5173 | } | |
5174 | ||
d88aee68 DG |
5175 | /* |
5176 | * Return a ust app channel object using the application object and the channel | |
5177 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
5178 | * lock MUST be acquired before calling this function. | |
5179 | */ | |
d0b96690 DG |
5180 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
5181 | int objd) | |
5182 | { | |
5183 | struct lttng_ht_node_ulong *node; | |
5184 | struct lttng_ht_iter iter; | |
5185 | struct ust_app_channel *ua_chan = NULL; | |
5186 | ||
5187 | assert(app); | |
5188 | ||
5189 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
5190 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5191 | if (node == NULL) { | |
5192 | DBG2("UST app channel find by objd %d not found", objd); | |
5193 | goto error; | |
5194 | } | |
5195 | ||
5196 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
5197 | ||
5198 | error: | |
5199 | return ua_chan; | |
5200 | } | |
5201 | ||
d88aee68 DG |
5202 | /* |
5203 | * Reply to a register channel notification from an application on the notify | |
5204 | * socket. The channel metadata is also created. | |
5205 | * | |
5206 | * The session UST registry lock is acquired in this function. | |
5207 | * | |
5208 | * On success 0 is returned else a negative value. | |
5209 | */ | |
d0b96690 DG |
5210 | static int reply_ust_register_channel(int sock, int sobjd, int cobjd, |
5211 | size_t nr_fields, struct ustctl_field *fields) | |
5212 | { | |
5213 | int ret, ret_code = 0; | |
5214 | uint32_t chan_id, reg_count; | |
7972aab2 | 5215 | uint64_t chan_reg_key; |
d0b96690 DG |
5216 | enum ustctl_channel_header type; |
5217 | struct ust_app *app; | |
5218 | struct ust_app_channel *ua_chan; | |
5219 | struct ust_app_session *ua_sess; | |
7972aab2 | 5220 | struct ust_registry_session *registry; |
45893984 | 5221 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
5222 | |
5223 | rcu_read_lock(); | |
5224 | ||
5225 | /* Lookup application. If not found, there is a code flow error. */ | |
5226 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
5227 | if (!app) { |
5228 | DBG("Application socket %d is being teardown. Abort event notify", | |
5229 | sock); | |
5230 | ret = 0; | |
d5d629b5 | 5231 | free(fields); |
d88aee68 DG |
5232 | goto error_rcu_unlock; |
5233 | } | |
d0b96690 | 5234 | |
4950b860 | 5235 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 5236 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
5237 | if (!ua_chan) { |
5238 | DBG("Application channel is being teardown. Abort event notify"); | |
5239 | ret = 0; | |
d5d629b5 | 5240 | free(fields); |
4950b860 MD |
5241 | goto error_rcu_unlock; |
5242 | } | |
5243 | ||
d0b96690 DG |
5244 | assert(ua_chan->session); |
5245 | ua_sess = ua_chan->session; | |
d0b96690 | 5246 | |
7972aab2 DG |
5247 | /* Get right session registry depending on the session buffer type. */ |
5248 | registry = get_session_registry(ua_sess); | |
5249 | assert(registry); | |
45893984 | 5250 | |
7972aab2 DG |
5251 | /* Depending on the buffer type, a different channel key is used. */ |
5252 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
5253 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 5254 | } else { |
7972aab2 | 5255 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
5256 | } |
5257 | ||
7972aab2 DG |
5258 | pthread_mutex_lock(®istry->lock); |
5259 | ||
5260 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
5261 | assert(chan_reg); | |
5262 | ||
5263 | if (!chan_reg->register_done) { | |
5264 | reg_count = ust_registry_get_event_count(chan_reg); | |
5265 | if (reg_count < 31) { | |
5266 | type = USTCTL_CHANNEL_HEADER_COMPACT; | |
5267 | } else { | |
5268 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
5269 | } | |
5270 | ||
5271 | chan_reg->nr_ctx_fields = nr_fields; | |
5272 | chan_reg->ctx_fields = fields; | |
5273 | chan_reg->header_type = type; | |
d0b96690 | 5274 | } else { |
7972aab2 DG |
5275 | /* Get current already assigned values. */ |
5276 | type = chan_reg->header_type; | |
d5d629b5 DG |
5277 | free(fields); |
5278 | /* Set to NULL so the error path does not do a double free. */ | |
5279 | fields = NULL; | |
d0b96690 | 5280 | } |
7972aab2 DG |
5281 | /* Channel id is set during the object creation. */ |
5282 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
5283 | |
5284 | /* Append to metadata */ | |
7972aab2 DG |
5285 | if (!chan_reg->metadata_dumped) { |
5286 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
5287 | if (ret_code) { |
5288 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
5289 | goto reply; | |
5290 | } | |
5291 | } | |
5292 | ||
5293 | reply: | |
7972aab2 DG |
5294 | DBG3("UST app replying to register channel key %" PRIu64 |
5295 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
5296 | ret_code); | |
d0b96690 DG |
5297 | |
5298 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
5299 | if (ret < 0) { | |
5300 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5301 | ERR("UST app reply channel failed with ret %d", ret); | |
5302 | } else { | |
5303 | DBG3("UST app reply channel failed. Application died"); | |
5304 | } | |
5305 | goto error; | |
5306 | } | |
5307 | ||
7972aab2 DG |
5308 | /* This channel registry registration is completed. */ |
5309 | chan_reg->register_done = 1; | |
5310 | ||
d0b96690 | 5311 | error: |
7972aab2 | 5312 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 5313 | error_rcu_unlock: |
d0b96690 | 5314 | rcu_read_unlock(); |
d5d629b5 DG |
5315 | if (ret) { |
5316 | free(fields); | |
5317 | } | |
d0b96690 DG |
5318 | return ret; |
5319 | } | |
5320 | ||
d88aee68 DG |
5321 | /* |
5322 | * Add event to the UST channel registry. When the event is added to the | |
5323 | * registry, the metadata is also created. Once done, this replies to the | |
5324 | * application with the appropriate error code. | |
5325 | * | |
5326 | * The session UST registry lock is acquired in the function. | |
5327 | * | |
5328 | * On success 0 is returned else a negative value. | |
5329 | */ | |
d0b96690 | 5330 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
2106efa0 PP |
5331 | char *sig, size_t nr_fields, struct ustctl_field *fields, |
5332 | int loglevel_value, char *model_emf_uri) | |
d0b96690 DG |
5333 | { |
5334 | int ret, ret_code; | |
5335 | uint32_t event_id = 0; | |
7972aab2 | 5336 | uint64_t chan_reg_key; |
d0b96690 DG |
5337 | struct ust_app *app; |
5338 | struct ust_app_channel *ua_chan; | |
5339 | struct ust_app_session *ua_sess; | |
7972aab2 | 5340 | struct ust_registry_session *registry; |
d0b96690 DG |
5341 | |
5342 | rcu_read_lock(); | |
5343 | ||
5344 | /* Lookup application. If not found, there is a code flow error. */ | |
5345 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
5346 | if (!app) { |
5347 | DBG("Application socket %d is being teardown. Abort event notify", | |
5348 | sock); | |
5349 | ret = 0; | |
d5d629b5 DG |
5350 | free(sig); |
5351 | free(fields); | |
5352 | free(model_emf_uri); | |
d88aee68 DG |
5353 | goto error_rcu_unlock; |
5354 | } | |
d0b96690 | 5355 | |
4950b860 | 5356 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 5357 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
5358 | if (!ua_chan) { |
5359 | DBG("Application channel is being teardown. Abort event notify"); | |
5360 | ret = 0; | |
d5d629b5 DG |
5361 | free(sig); |
5362 | free(fields); | |
5363 | free(model_emf_uri); | |
4950b860 MD |
5364 | goto error_rcu_unlock; |
5365 | } | |
5366 | ||
d0b96690 DG |
5367 | assert(ua_chan->session); |
5368 | ua_sess = ua_chan->session; | |
5369 | ||
7972aab2 DG |
5370 | registry = get_session_registry(ua_sess); |
5371 | assert(registry); | |
5372 | ||
5373 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
5374 | chan_reg_key = ua_chan->tracing_channel_id; | |
5375 | } else { | |
5376 | chan_reg_key = ua_chan->key; | |
5377 | } | |
5378 | ||
5379 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 5380 | |
d5d629b5 DG |
5381 | /* |
5382 | * From this point on, this call acquires the ownership of the sig, fields | |
5383 | * and model_emf_uri meaning any free are done inside it if needed. These | |
5384 | * three variables MUST NOT be read/write after this. | |
5385 | */ | |
7972aab2 | 5386 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
2106efa0 PP |
5387 | sobjd, cobjd, name, sig, nr_fields, fields, |
5388 | loglevel_value, model_emf_uri, ua_sess->buffer_type, | |
5389 | &event_id, app); | |
d0b96690 DG |
5390 | |
5391 | /* | |
5392 | * The return value is returned to ustctl so in case of an error, the | |
5393 | * application can be notified. In case of an error, it's important not to | |
5394 | * return a negative error or else the application will get closed. | |
5395 | */ | |
5396 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
5397 | if (ret < 0) { | |
5398 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5399 | ERR("UST app reply event failed with ret %d", ret); | |
5400 | } else { | |
5401 | DBG3("UST app reply event failed. Application died"); | |
5402 | } | |
5403 | /* | |
5404 | * No need to wipe the create event since the application socket will | |
5405 | * get close on error hence cleaning up everything by itself. | |
5406 | */ | |
5407 | goto error; | |
5408 | } | |
5409 | ||
7972aab2 DG |
5410 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
5411 | name, event_id); | |
d88aee68 | 5412 | |
d0b96690 | 5413 | error: |
7972aab2 | 5414 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 5415 | error_rcu_unlock: |
d0b96690 DG |
5416 | rcu_read_unlock(); |
5417 | return ret; | |
5418 | } | |
5419 | ||
10b56aef MD |
5420 | /* |
5421 | * Add enum to the UST session registry. Once done, this replies to the | |
5422 | * application with the appropriate error code. | |
5423 | * | |
5424 | * The session UST registry lock is acquired within this function. | |
5425 | * | |
5426 | * On success 0 is returned else a negative value. | |
5427 | */ | |
5428 | static int add_enum_ust_registry(int sock, int sobjd, char *name, | |
5429 | struct ustctl_enum_entry *entries, size_t nr_entries) | |
5430 | { | |
5431 | int ret = 0, ret_code; | |
5432 | struct ust_app *app; | |
5433 | struct ust_app_session *ua_sess; | |
5434 | struct ust_registry_session *registry; | |
5435 | uint64_t enum_id = -1ULL; | |
5436 | ||
5437 | rcu_read_lock(); | |
5438 | ||
5439 | /* Lookup application. If not found, there is a code flow error. */ | |
5440 | app = find_app_by_notify_sock(sock); | |
5441 | if (!app) { | |
5442 | /* Return an error since this is not an error */ | |
5443 | DBG("Application socket %d is being torn down. Aborting enum registration", | |
5444 | sock); | |
5445 | free(entries); | |
5446 | goto error_rcu_unlock; | |
5447 | } | |
5448 | ||
5449 | /* Lookup session by UST object descriptor. */ | |
5450 | ua_sess = find_session_by_objd(app, sobjd); | |
5451 | if (!ua_sess) { | |
5452 | /* Return an error since this is not an error */ | |
5453 | DBG("Application session is being torn down. Aborting enum registration."); | |
5454 | free(entries); | |
5455 | goto error_rcu_unlock; | |
5456 | } | |
5457 | ||
5458 | registry = get_session_registry(ua_sess); | |
5459 | assert(registry); | |
5460 | ||
5461 | pthread_mutex_lock(®istry->lock); | |
5462 | ||
5463 | /* | |
5464 | * From this point on, the callee acquires the ownership of | |
5465 | * entries. The variable entries MUST NOT be read/written after | |
5466 | * call. | |
5467 | */ | |
5468 | ret_code = ust_registry_create_or_find_enum(registry, sobjd, name, | |
5469 | entries, nr_entries, &enum_id); | |
5470 | entries = NULL; | |
5471 | ||
5472 | /* | |
5473 | * The return value is returned to ustctl so in case of an error, the | |
5474 | * application can be notified. In case of an error, it's important not to | |
5475 | * return a negative error or else the application will get closed. | |
5476 | */ | |
5477 | ret = ustctl_reply_register_enum(sock, enum_id, ret_code); | |
5478 | if (ret < 0) { | |
5479 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5480 | ERR("UST app reply enum failed with ret %d", ret); | |
5481 | } else { | |
5482 | DBG3("UST app reply enum failed. Application died"); | |
5483 | } | |
5484 | /* | |
5485 | * No need to wipe the create enum since the application socket will | |
5486 | * get close on error hence cleaning up everything by itself. | |
5487 | */ | |
5488 | goto error; | |
5489 | } | |
5490 | ||
5491 | DBG3("UST registry enum %s added successfully or already found", name); | |
5492 | ||
5493 | error: | |
5494 | pthread_mutex_unlock(®istry->lock); | |
5495 | error_rcu_unlock: | |
5496 | rcu_read_unlock(); | |
5497 | return ret; | |
5498 | } | |
5499 | ||
d88aee68 DG |
5500 | /* |
5501 | * Handle application notification through the given notify socket. | |
5502 | * | |
5503 | * Return 0 on success or else a negative value. | |
5504 | */ | |
d0b96690 DG |
5505 | int ust_app_recv_notify(int sock) |
5506 | { | |
5507 | int ret; | |
5508 | enum ustctl_notify_cmd cmd; | |
5509 | ||
5510 | DBG3("UST app receiving notify from sock %d", sock); | |
5511 | ||
5512 | ret = ustctl_recv_notify(sock, &cmd); | |
5513 | if (ret < 0) { | |
5514 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5515 | ERR("UST app recv notify failed with ret %d", ret); | |
5516 | } else { | |
5517 | DBG3("UST app recv notify failed. Application died"); | |
5518 | } | |
5519 | goto error; | |
5520 | } | |
5521 | ||
5522 | switch (cmd) { | |
5523 | case USTCTL_NOTIFY_CMD_EVENT: | |
5524 | { | |
2106efa0 | 5525 | int sobjd, cobjd, loglevel_value; |
d0b96690 DG |
5526 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; |
5527 | size_t nr_fields; | |
5528 | struct ustctl_field *fields; | |
5529 | ||
5530 | DBG2("UST app ustctl register event received"); | |
5531 | ||
2106efa0 PP |
5532 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, |
5533 | &loglevel_value, &sig, &nr_fields, &fields, | |
5534 | &model_emf_uri); | |
d0b96690 DG |
5535 | if (ret < 0) { |
5536 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5537 | ERR("UST app recv event failed with ret %d", ret); | |
5538 | } else { | |
5539 | DBG3("UST app recv event failed. Application died"); | |
5540 | } | |
5541 | goto error; | |
5542 | } | |
5543 | ||
d5d629b5 DG |
5544 | /* |
5545 | * Add event to the UST registry coming from the notify socket. This | |
5546 | * call will free if needed the sig, fields and model_emf_uri. This | |
5547 | * code path loses the ownsership of these variables and transfer them | |
5548 | * to the this function. | |
5549 | */ | |
d0b96690 | 5550 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
2106efa0 | 5551 | fields, loglevel_value, model_emf_uri); |
d0b96690 DG |
5552 | if (ret < 0) { |
5553 | goto error; | |
5554 | } | |
5555 | ||
5556 | break; | |
5557 | } | |
5558 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
5559 | { | |
5560 | int sobjd, cobjd; | |
5561 | size_t nr_fields; | |
5562 | struct ustctl_field *fields; | |
5563 | ||
5564 | DBG2("UST app ustctl register channel received"); | |
5565 | ||
5566 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
5567 | &fields); | |
5568 | if (ret < 0) { | |
5569 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5570 | ERR("UST app recv channel failed with ret %d", ret); | |
5571 | } else { | |
5572 | DBG3("UST app recv channel failed. Application died"); | |
5573 | } | |
5574 | goto error; | |
5575 | } | |
5576 | ||
d5d629b5 DG |
5577 | /* |
5578 | * The fields ownership are transfered to this function call meaning | |
5579 | * that if needed it will be freed. After this, it's invalid to access | |
5580 | * fields or clean it up. | |
5581 | */ | |
d0b96690 DG |
5582 | ret = reply_ust_register_channel(sock, sobjd, cobjd, nr_fields, |
5583 | fields); | |
5584 | if (ret < 0) { | |
5585 | goto error; | |
5586 | } | |
5587 | ||
5588 | break; | |
5589 | } | |
10b56aef MD |
5590 | case USTCTL_NOTIFY_CMD_ENUM: |
5591 | { | |
5592 | int sobjd; | |
5593 | char name[LTTNG_UST_SYM_NAME_LEN]; | |
5594 | size_t nr_entries; | |
5595 | struct ustctl_enum_entry *entries; | |
5596 | ||
5597 | DBG2("UST app ustctl register enum received"); | |
5598 | ||
5599 | ret = ustctl_recv_register_enum(sock, &sobjd, name, | |
5600 | &entries, &nr_entries); | |
5601 | if (ret < 0) { | |
5602 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5603 | ERR("UST app recv enum failed with ret %d", ret); | |
5604 | } else { | |
5605 | DBG3("UST app recv enum failed. Application died"); | |
5606 | } | |
5607 | goto error; | |
5608 | } | |
5609 | ||
5610 | /* Callee assumes ownership of entries */ | |
5611 | ret = add_enum_ust_registry(sock, sobjd, name, | |
5612 | entries, nr_entries); | |
5613 | if (ret < 0) { | |
5614 | goto error; | |
5615 | } | |
5616 | ||
5617 | break; | |
5618 | } | |
d0b96690 DG |
5619 | default: |
5620 | /* Should NEVER happen. */ | |
5621 | assert(0); | |
5622 | } | |
5623 | ||
5624 | error: | |
5625 | return ret; | |
5626 | } | |
d88aee68 DG |
5627 | |
5628 | /* | |
5629 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
5630 | * corresponding application. On failure, the call_rcu to close the socket is | |
5631 | * executed. If an application is found, it tries to delete it from the notify | |
5632 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
5633 | * | |
5634 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
5635 | * call RCU is not done but the rest of the cleanup is. | |
5636 | */ | |
5637 | void ust_app_notify_sock_unregister(int sock) | |
5638 | { | |
5639 | int err_enomem = 0; | |
5640 | struct lttng_ht_iter iter; | |
5641 | struct ust_app *app; | |
5642 | struct ust_app_notify_sock_obj *obj; | |
5643 | ||
5644 | assert(sock >= 0); | |
5645 | ||
5646 | rcu_read_lock(); | |
5647 | ||
5648 | obj = zmalloc(sizeof(*obj)); | |
5649 | if (!obj) { | |
5650 | /* | |
5651 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
5652 | * procedure but the call_rcu will not be called. In this case, we | |
5653 | * accept the fd leak rather than possibly creating an unsynchronized | |
5654 | * state between threads. | |
5655 | * | |
5656 | * TODO: The notify object should be created once the notify socket is | |
5657 | * registered and stored independantely from the ust app object. The | |
5658 | * tricky part is to synchronize the teardown of the application and | |
5659 | * this notify object. Let's keep that in mind so we can avoid this | |
5660 | * kind of shenanigans with ENOMEM in the teardown path. | |
5661 | */ | |
5662 | err_enomem = 1; | |
5663 | } else { | |
5664 | obj->fd = sock; | |
5665 | } | |
5666 | ||
5667 | DBG("UST app notify socket unregister %d", sock); | |
5668 | ||
5669 | /* | |
5670 | * Lookup application by notify socket. If this fails, this means that the | |
5671 | * hash table delete has already been done by the application | |
5672 | * unregistration process so we can safely close the notify socket in a | |
5673 | * call RCU. | |
5674 | */ | |
5675 | app = find_app_by_notify_sock(sock); | |
5676 | if (!app) { | |
5677 | goto close_socket; | |
5678 | } | |
5679 | ||
5680 | iter.iter.node = &app->notify_sock_n.node; | |
5681 | ||
5682 | /* | |
5683 | * Whatever happens here either we fail or succeed, in both cases we have | |
5684 | * to close the socket after a grace period to continue to the call RCU | |
5685 | * here. If the deletion is successful, the application is not visible | |
5686 | * anymore by other threads and is it fails it means that it was already | |
5687 | * deleted from the hash table so either way we just have to close the | |
5688 | * socket. | |
5689 | */ | |
5690 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
5691 | ||
5692 | close_socket: | |
5693 | rcu_read_unlock(); | |
5694 | ||
5695 | /* | |
5696 | * Close socket after a grace period to avoid for the socket to be reused | |
5697 | * before the application object is freed creating potential race between | |
5698 | * threads trying to add unique in the global hash table. | |
5699 | */ | |
5700 | if (!err_enomem) { | |
5701 | call_rcu(&obj->head, close_notify_sock_rcu); | |
5702 | } | |
5703 | } | |
f45e313d DG |
5704 | |
5705 | /* | |
5706 | * Destroy a ust app data structure and free its memory. | |
5707 | */ | |
5708 | void ust_app_destroy(struct ust_app *app) | |
5709 | { | |
5710 | if (!app) { | |
5711 | return; | |
5712 | } | |
5713 | ||
5714 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
5715 | } | |
6dc3064a DG |
5716 | |
5717 | /* | |
5718 | * Take a snapshot for a given UST session. The snapshot is sent to the given | |
5719 | * output. | |
5720 | * | |
5721 | * Return 0 on success or else a negative value. | |
5722 | */ | |
5723 | int ust_app_snapshot_record(struct ltt_ust_session *usess, | |
d07ceecd MD |
5724 | struct snapshot_output *output, int wait, |
5725 | uint64_t nb_packets_per_stream) | |
6dc3064a DG |
5726 | { |
5727 | int ret = 0; | |
7badf927 | 5728 | unsigned int snapshot_done = 0; |
6dc3064a DG |
5729 | struct lttng_ht_iter iter; |
5730 | struct ust_app *app; | |
af706bb7 | 5731 | char pathname[PATH_MAX]; |
6dc3064a DG |
5732 | |
5733 | assert(usess); | |
5734 | assert(output); | |
5735 | ||
5736 | rcu_read_lock(); | |
5737 | ||
8c924c7b MD |
5738 | switch (usess->buffer_type) { |
5739 | case LTTNG_BUFFER_PER_UID: | |
5740 | { | |
5741 | struct buffer_reg_uid *reg; | |
6dc3064a | 5742 | |
8c924c7b MD |
5743 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
5744 | struct buffer_reg_channel *reg_chan; | |
5745 | struct consumer_socket *socket; | |
6dc3064a | 5746 | |
8c924c7b MD |
5747 | /* Get consumer socket to use to push the metadata.*/ |
5748 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
5749 | usess->consumer); | |
5750 | if (!socket) { | |
5751 | ret = -EINVAL; | |
5752 | goto error; | |
5753 | } | |
6dc3064a | 5754 | |
8c924c7b MD |
5755 | memset(pathname, 0, sizeof(pathname)); |
5756 | ret = snprintf(pathname, sizeof(pathname), | |
5757 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH, | |
5758 | reg->uid, reg->bits_per_long); | |
5759 | if (ret < 0) { | |
5760 | PERROR("snprintf snapshot path"); | |
5761 | goto error; | |
5762 | } | |
5763 | ||
5764 | /* Add the UST default trace dir to path. */ | |
5765 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
5766 | reg_chan, node.node) { | |
68808f4e DG |
5767 | ret = consumer_snapshot_channel(socket, reg_chan->consumer_key, |
5768 | output, 0, usess->uid, usess->gid, pathname, wait, | |
d07ceecd | 5769 | nb_packets_per_stream); |
8c924c7b MD |
5770 | if (ret < 0) { |
5771 | goto error; | |
5772 | } | |
5773 | } | |
68808f4e DG |
5774 | ret = consumer_snapshot_channel(socket, |
5775 | reg->registry->reg.ust->metadata_key, output, 1, | |
d07ceecd | 5776 | usess->uid, usess->gid, pathname, wait, 0); |
8c924c7b MD |
5777 | if (ret < 0) { |
5778 | goto error; | |
5779 | } | |
7badf927 | 5780 | snapshot_done = 1; |
af706bb7 | 5781 | } |
8c924c7b MD |
5782 | break; |
5783 | } | |
5784 | case LTTNG_BUFFER_PER_PID: | |
5785 | { | |
5786 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5787 | struct consumer_socket *socket; | |
5788 | struct lttng_ht_iter chan_iter; | |
5789 | struct ust_app_channel *ua_chan; | |
5790 | struct ust_app_session *ua_sess; | |
5791 | struct ust_registry_session *registry; | |
5792 | ||
5793 | ua_sess = lookup_session_by_app(usess, app); | |
5794 | if (!ua_sess) { | |
5795 | /* Session not associated with this app. */ | |
5796 | continue; | |
5797 | } | |
af706bb7 | 5798 | |
8c924c7b MD |
5799 | /* Get the right consumer socket for the application. */ |
5800 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
5801 | output->consumer); | |
5802 | if (!socket) { | |
5c786ded | 5803 | ret = -EINVAL; |
5c786ded JD |
5804 | goto error; |
5805 | } | |
5806 | ||
8c924c7b MD |
5807 | /* Add the UST default trace dir to path. */ |
5808 | memset(pathname, 0, sizeof(pathname)); | |
5809 | ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "/%s", | |
5810 | ua_sess->path); | |
6dc3064a | 5811 | if (ret < 0) { |
8c924c7b | 5812 | PERROR("snprintf snapshot path"); |
6dc3064a DG |
5813 | goto error; |
5814 | } | |
6dc3064a | 5815 | |
8c924c7b MD |
5816 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, |
5817 | ua_chan, node.node) { | |
68808f4e DG |
5818 | ret = consumer_snapshot_channel(socket, ua_chan->key, output, |
5819 | 0, ua_sess->euid, ua_sess->egid, pathname, wait, | |
d07ceecd | 5820 | nb_packets_per_stream); |
8c924c7b MD |
5821 | if (ret < 0) { |
5822 | goto error; | |
5823 | } | |
5824 | } | |
5825 | ||
5826 | registry = get_session_registry(ua_sess); | |
5827 | assert(registry); | |
5828 | ret = consumer_snapshot_channel(socket, registry->metadata_key, output, | |
d07ceecd | 5829 | 1, ua_sess->euid, ua_sess->egid, pathname, wait, 0); |
8c924c7b MD |
5830 | if (ret < 0) { |
5831 | goto error; | |
5832 | } | |
7badf927 | 5833 | snapshot_done = 1; |
8c924c7b MD |
5834 | } |
5835 | break; | |
5836 | } | |
5837 | default: | |
5838 | assert(0); | |
5839 | break; | |
6dc3064a DG |
5840 | } |
5841 | ||
7badf927 DG |
5842 | if (!snapshot_done) { |
5843 | /* | |
5844 | * If no snapshot was made and we are not in the error path, this means | |
5845 | * that there are no buffers thus no (prior) application to snapshot | |
5846 | * data from so we have simply NO data. | |
5847 | */ | |
5848 | ret = -ENODATA; | |
5849 | } | |
5850 | ||
6dc3064a DG |
5851 | error: |
5852 | rcu_read_unlock(); | |
5853 | return ret; | |
5854 | } | |
5c786ded JD |
5855 | |
5856 | /* | |
d07ceecd | 5857 | * Return the size taken by one more packet per stream. |
5c786ded | 5858 | */ |
d07ceecd MD |
5859 | uint64_t ust_app_get_size_one_more_packet_per_stream(struct ltt_ust_session *usess, |
5860 | uint64_t cur_nr_packets) | |
5c786ded | 5861 | { |
d07ceecd | 5862 | uint64_t tot_size = 0; |
5c786ded JD |
5863 | struct ust_app *app; |
5864 | struct lttng_ht_iter iter; | |
5865 | ||
5866 | assert(usess); | |
5867 | ||
5868 | switch (usess->buffer_type) { | |
5869 | case LTTNG_BUFFER_PER_UID: | |
5870 | { | |
5871 | struct buffer_reg_uid *reg; | |
5872 | ||
5873 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
5874 | struct buffer_reg_channel *reg_chan; | |
5875 | ||
b7064eaa | 5876 | rcu_read_lock(); |
5c786ded JD |
5877 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
5878 | reg_chan, node.node) { | |
d07ceecd MD |
5879 | if (cur_nr_packets >= reg_chan->num_subbuf) { |
5880 | /* | |
5881 | * Don't take channel into account if we | |
5882 | * already grab all its packets. | |
5883 | */ | |
5884 | continue; | |
5885 | } | |
5886 | tot_size += reg_chan->subbuf_size * reg_chan->stream_count; | |
5c786ded | 5887 | } |
b7064eaa | 5888 | rcu_read_unlock(); |
5c786ded JD |
5889 | } |
5890 | break; | |
5891 | } | |
5892 | case LTTNG_BUFFER_PER_PID: | |
5893 | { | |
5894 | rcu_read_lock(); | |
5895 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5896 | struct ust_app_channel *ua_chan; | |
5897 | struct ust_app_session *ua_sess; | |
5898 | struct lttng_ht_iter chan_iter; | |
5899 | ||
5900 | ua_sess = lookup_session_by_app(usess, app); | |
5901 | if (!ua_sess) { | |
5902 | /* Session not associated with this app. */ | |
5903 | continue; | |
5904 | } | |
5905 | ||
5906 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
5907 | ua_chan, node.node) { | |
d07ceecd MD |
5908 | if (cur_nr_packets >= ua_chan->attr.num_subbuf) { |
5909 | /* | |
5910 | * Don't take channel into account if we | |
5911 | * already grab all its packets. | |
5912 | */ | |
5913 | continue; | |
5914 | } | |
5915 | tot_size += ua_chan->attr.subbuf_size * ua_chan->streams.count; | |
5c786ded JD |
5916 | } |
5917 | } | |
5918 | rcu_read_unlock(); | |
5919 | break; | |
5920 | } | |
5921 | default: | |
5922 | assert(0); | |
5923 | break; | |
5924 | } | |
5925 | ||
d07ceecd | 5926 | return tot_size; |
5c786ded | 5927 | } |
fb83fe64 JD |
5928 | |
5929 | int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id, | |
5930 | struct cds_list_head *buffer_reg_uid_list, | |
5931 | struct consumer_output *consumer, uint64_t uchan_id, | |
5932 | int overwrite, uint64_t *discarded, uint64_t *lost) | |
5933 | { | |
5934 | int ret; | |
5935 | uint64_t consumer_chan_key; | |
5936 | ||
5937 | ret = buffer_reg_uid_consumer_channel_key( | |
5938 | buffer_reg_uid_list, ust_session_id, | |
5939 | uchan_id, &consumer_chan_key); | |
5940 | if (ret < 0) { | |
5941 | goto end; | |
5942 | } | |
5943 | ||
5944 | if (overwrite) { | |
5945 | ret = consumer_get_lost_packets(ust_session_id, | |
5946 | consumer_chan_key, consumer, lost); | |
5947 | } else { | |
5948 | ret = consumer_get_discarded_events(ust_session_id, | |
5949 | consumer_chan_key, consumer, discarded); | |
5950 | } | |
5951 | ||
5952 | end: | |
5953 | return ret; | |
5954 | } | |
5955 | ||
5956 | int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess, | |
5957 | struct ltt_ust_channel *uchan, | |
5958 | struct consumer_output *consumer, int overwrite, | |
5959 | uint64_t *discarded, uint64_t *lost) | |
5960 | { | |
5961 | int ret = 0; | |
5962 | struct lttng_ht_iter iter; | |
5963 | struct lttng_ht_node_str *ua_chan_node; | |
5964 | struct ust_app *app; | |
5965 | struct ust_app_session *ua_sess; | |
5966 | struct ust_app_channel *ua_chan; | |
5967 | ||
5968 | rcu_read_lock(); | |
5969 | /* | |
5970 | * Iterate over every registered applications, return when we | |
5971 | * found one in the right session and channel. | |
5972 | */ | |
5973 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5974 | struct lttng_ht_iter uiter; | |
5975 | ||
5976 | ua_sess = lookup_session_by_app(usess, app); | |
5977 | if (ua_sess == NULL) { | |
5978 | continue; | |
5979 | } | |
5980 | ||
5981 | /* Get channel */ | |
ee022399 | 5982 | lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &uiter); |
fb83fe64 JD |
5983 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); |
5984 | /* If the session is found for the app, the channel must be there */ | |
5985 | assert(ua_chan_node); | |
5986 | ||
5987 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
5988 | ||
5989 | if (overwrite) { | |
5990 | ret = consumer_get_lost_packets(usess->id, ua_chan->key, | |
5991 | consumer, lost); | |
5992 | goto end; | |
5993 | } else { | |
5994 | ret = consumer_get_discarded_events(usess->id, | |
5995 | ua_chan->key, consumer, discarded); | |
5996 | goto end; | |
5997 | } | |
fb83fe64 JD |
5998 | } |
5999 | ||
6000 | end: | |
6001 | rcu_read_unlock(); | |
6002 | return ret; | |
6003 | } |