Commit | Line | Data |
---|---|---|
48842b30 DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * | |
d14d33bf AM |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License, version 2 only, | |
6 | * as published by the Free Software Foundation. | |
48842b30 | 7 | * |
d14d33bf AM |
8 | * This program is distributed in the hope that it will be useful, |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
48842b30 | 12 | * |
d14d33bf AM |
13 | * You should have received a copy of the GNU General Public License along |
14 | * with this program; if not, write to the Free Software Foundation, Inc., | |
15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
48842b30 DG |
16 | */ |
17 | ||
6c1c0768 | 18 | #define _LGPL_SOURCE |
48842b30 DG |
19 | #include <errno.h> |
20 | #include <stdio.h> | |
21 | #include <stdlib.h> | |
22 | #include <string.h> | |
23 | #include <unistd.h> | |
d88aee68 | 24 | #include <inttypes.h> |
48842b30 | 25 | |
990570ed | 26 | #include <common/common.h> |
c8fea79c | 27 | #include <common/consumer/consumer.h> |
990570ed | 28 | #include <common/defaults.h> |
48842b30 | 29 | |
00e2e675 | 30 | #include "consumer.h" |
8782cc74 | 31 | #include "health-sessiond.h" |
48842b30 | 32 | #include "ust-consumer.h" |
331744e3 JD |
33 | #include "buffer-registry.h" |
34 | #include "session.h" | |
e9404c27 | 35 | #include "lttng-sessiond.h" |
48842b30 DG |
36 | |
37 | /* | |
ffe60014 | 38 | * Return allocated full pathname of the session using the consumer trace path |
d2956687 | 39 | * and subdir if available. |
ffe60014 DG |
40 | * |
41 | * The caller can safely free(3) the returned value. On error, NULL is | |
42 | * returned. | |
48842b30 | 43 | */ |
d2956687 | 44 | static char *setup_channel_trace_path(struct consumer_output *consumer, |
ffe60014 | 45 | struct ust_app_session *ua_sess) |
48842b30 | 46 | { |
ffe60014 DG |
47 | int ret; |
48 | char *pathname; | |
37278a1e | 49 | |
ffe60014 DG |
50 | assert(consumer); |
51 | assert(ua_sess); | |
00e2e675 | 52 | |
840cb59c | 53 | health_code_update(); |
ca03de58 | 54 | |
61ba6b6d JG |
55 | /* |
56 | * Allocate the string ourself to make sure we never exceed | |
57 | * LTTNG_PATH_MAX. | |
58 | */ | |
59 | pathname = zmalloc(LTTNG_PATH_MAX); | |
ffe60014 | 60 | if (!pathname) { |
48842b30 DG |
61 | goto error; |
62 | } | |
00e2e675 | 63 | |
ffe60014 DG |
64 | /* Get correct path name destination */ |
65 | if (consumer->type == CONSUMER_DST_LOCAL) { | |
66 | /* Set application path to the destination path */ | |
d2956687 | 67 | ret = snprintf(pathname, LTTNG_PATH_MAX, "%s%s", |
b178f53e | 68 | consumer->domain_subdir, ua_sess->path); |
d2956687 JG |
69 | DBG3("Userspace local consumer trace path relative to current trace chunk: \"%s\"", |
70 | pathname); | |
ffe60014 | 71 | } else { |
b178f53e | 72 | ret = snprintf(pathname, LTTNG_PATH_MAX, "%s%s/%s%s", |
2b29c638 JD |
73 | consumer->dst.net.base_dir, |
74 | consumer->chunk_path, | |
b178f53e | 75 | consumer->domain_subdir, |
ffe60014 | 76 | ua_sess->path); |
d2956687 JG |
77 | } |
78 | if (ret < 0) { | |
79 | PERROR("Failed to format channel path"); | |
80 | goto error; | |
81 | } else if (ret >= LTTNG_PATH_MAX) { | |
82 | ERR("Truncation occurred while formatting channel path"); | |
83 | ret = -1; | |
84 | goto error; | |
48842b30 DG |
85 | } |
86 | ||
ffe60014 | 87 | return pathname; |
ca03de58 | 88 | |
37278a1e | 89 | error: |
ffe60014 DG |
90 | free(pathname); |
91 | return NULL; | |
37278a1e DG |
92 | } |
93 | ||
94 | /* | |
e9404c27 | 95 | * Send a single channel to the consumer using command ASK_CHANNEL_CREATION. |
ffe60014 | 96 | * |
7972aab2 | 97 | * Consumer socket lock MUST be acquired before calling this. |
37278a1e | 98 | */ |
ffe60014 | 99 | static int ask_channel_creation(struct ust_app_session *ua_sess, |
e098433c JG |
100 | struct ust_app_channel *ua_chan, |
101 | struct consumer_output *consumer, | |
102 | struct consumer_socket *socket, | |
103 | struct ust_registry_session *registry, | |
d2956687 | 104 | struct lttng_trace_chunk *trace_chunk) |
37278a1e | 105 | { |
0c759fc9 | 106 | int ret, output; |
7972aab2 DG |
107 | uint32_t chan_id; |
108 | uint64_t key, chan_reg_key; | |
ffe60014 | 109 | char *pathname = NULL; |
37278a1e | 110 | struct lttcomm_consumer_msg msg; |
7972aab2 | 111 | struct ust_registry_channel *chan_reg; |
d7ba1388 | 112 | char shm_path[PATH_MAX] = ""; |
3d071855 | 113 | char root_shm_path[PATH_MAX] = ""; |
d2956687 | 114 | bool is_local_trace; |
37278a1e | 115 | |
ffe60014 DG |
116 | assert(ua_sess); |
117 | assert(ua_chan); | |
118 | assert(socket); | |
37278a1e | 119 | assert(consumer); |
7972aab2 | 120 | assert(registry); |
ffe60014 DG |
121 | |
122 | DBG2("Asking UST consumer for channel"); | |
123 | ||
d2956687 JG |
124 | is_local_trace = consumer->net_seq_index == -1ULL; |
125 | /* Format the channel's path (relative to the current trace chunk). */ | |
126 | pathname = setup_channel_trace_path(consumer, ua_sess); | |
127 | if (!pathname) { | |
128 | ret = -1; | |
129 | goto error; | |
130 | } | |
131 | ||
132 | if (is_local_trace && trace_chunk) { | |
133 | enum lttng_trace_chunk_status chunk_status; | |
134 | char *pathname_index; | |
135 | ||
136 | ret = asprintf(&pathname_index, "%s/" DEFAULT_INDEX_DIR, | |
137 | pathname); | |
138 | if (ret < 0) { | |
139 | ERR("Failed to format channel index directory"); | |
140 | ret = -1; | |
141 | goto error; | |
142 | } | |
143 | ||
144 | /* | |
145 | * Create the index subdirectory which will take care | |
146 | * of implicitly creating the channel's path. | |
147 | */ | |
148 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
149 | trace_chunk, pathname_index); | |
150 | free(pathname_index); | |
151 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
10a50311 JD |
152 | ret = -1; |
153 | goto error; | |
154 | } | |
ffe60014 DG |
155 | } |
156 | ||
7972aab2 DG |
157 | /* Depending on the buffer type, a different channel key is used. */ |
158 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
159 | chan_reg_key = ua_chan->tracing_channel_id; | |
160 | } else { | |
161 | chan_reg_key = ua_chan->key; | |
162 | } | |
163 | ||
164 | if (ua_chan->attr.type == LTTNG_UST_CHAN_METADATA) { | |
165 | chan_id = -1U; | |
d7ba1388 MD |
166 | /* |
167 | * Metadata channels shm_path (buffers) are handled within | |
168 | * session daemon. Consumer daemon should not try to create | |
169 | * those buffer files. | |
170 | */ | |
7972aab2 DG |
171 | } else { |
172 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
173 | assert(chan_reg); | |
174 | chan_id = chan_reg->chan_id; | |
d7ba1388 MD |
175 | if (ua_sess->shm_path[0]) { |
176 | strncpy(shm_path, ua_sess->shm_path, sizeof(shm_path)); | |
177 | shm_path[sizeof(shm_path) - 1] = '\0'; | |
178 | strncat(shm_path, "/", | |
179 | sizeof(shm_path) - strlen(shm_path) - 1); | |
180 | strncat(shm_path, ua_chan->name, | |
181 | sizeof(shm_path) - strlen(shm_path) - 1); | |
182 | strncat(shm_path, "_", | |
183 | sizeof(shm_path) - strlen(shm_path) - 1); | |
184 | } | |
3d071855 MD |
185 | strncpy(root_shm_path, ua_sess->root_shm_path, sizeof(root_shm_path)); |
186 | root_shm_path[sizeof(root_shm_path) - 1] = '\0'; | |
7972aab2 DG |
187 | } |
188 | ||
0c759fc9 DG |
189 | switch (ua_chan->attr.output) { |
190 | case LTTNG_UST_MMAP: | |
191 | default: | |
192 | output = LTTNG_EVENT_MMAP; | |
193 | break; | |
194 | } | |
195 | ||
ffe60014 DG |
196 | consumer_init_ask_channel_comm_msg(&msg, |
197 | ua_chan->attr.subbuf_size, | |
198 | ua_chan->attr.num_subbuf, | |
199 | ua_chan->attr.overwrite, | |
200 | ua_chan->attr.switch_timer_interval, | |
201 | ua_chan->attr.read_timer_interval, | |
ecc48a90 | 202 | ua_sess->live_timer_interval, |
e9404c27 | 203 | ua_chan->monitor_timer_interval, |
0c759fc9 | 204 | output, |
ffe60014 | 205 | (int) ua_chan->attr.type, |
7972aab2 | 206 | ua_sess->tracing_id, |
ca22feea | 207 | pathname, |
ffe60014 | 208 | ua_chan->name, |
ffe60014 DG |
209 | consumer->net_seq_index, |
210 | ua_chan->key, | |
7972aab2 | 211 | registry->uuid, |
1624d5b7 JD |
212 | chan_id, |
213 | ua_chan->tracefile_size, | |
2bba9e53 | 214 | ua_chan->tracefile_count, |
1950109e | 215 | ua_sess->id, |
567eb353 | 216 | ua_sess->output_traces, |
470cc211 | 217 | ua_sess->real_credentials.uid, |
491d1539 | 218 | ua_chan->attr.blocking_timeout, |
e098433c | 219 | root_shm_path, shm_path, |
470cc211 JG |
220 | trace_chunk, |
221 | &ua_sess->effective_credentials); | |
37278a1e | 222 | |
840cb59c | 223 | health_code_update(); |
ca03de58 | 224 | |
52898cb1 | 225 | ret = consumer_socket_send(socket, &msg, sizeof(msg)); |
37278a1e DG |
226 | if (ret < 0) { |
227 | goto error; | |
228 | } | |
229 | ||
ffe60014 DG |
230 | ret = consumer_recv_status_channel(socket, &key, |
231 | &ua_chan->expected_stream_count); | |
232 | if (ret < 0) { | |
233 | goto error; | |
234 | } | |
235 | /* Communication protocol error. */ | |
236 | assert(key == ua_chan->key); | |
237 | /* We need at least one where 1 stream for 1 cpu. */ | |
10a50311 JD |
238 | if (ua_sess->output_traces) { |
239 | assert(ua_chan->expected_stream_count > 0); | |
240 | } | |
ffe60014 | 241 | |
d88aee68 | 242 | DBG2("UST ask channel %" PRIu64 " successfully done with %u stream(s)", key, |
ffe60014 | 243 | ua_chan->expected_stream_count); |
ca03de58 | 244 | |
37278a1e | 245 | error: |
ffe60014 DG |
246 | free(pathname); |
247 | health_code_update(); | |
37278a1e DG |
248 | return ret; |
249 | } | |
250 | ||
251 | /* | |
ffe60014 DG |
252 | * Ask consumer to create a channel for a given session. |
253 | * | |
e9404c27 JG |
254 | * Session list and rcu read side locks must be held by the caller. |
255 | * | |
ffe60014 | 256 | * Returns 0 on success else a negative value. |
37278a1e | 257 | */ |
ffe60014 | 258 | int ust_consumer_ask_channel(struct ust_app_session *ua_sess, |
e098433c JG |
259 | struct ust_app_channel *ua_chan, |
260 | struct consumer_output *consumer, | |
261 | struct consumer_socket *socket, | |
262 | struct ust_registry_session *registry, | |
d2956687 | 263 | struct lttng_trace_chunk * trace_chunk) |
37278a1e DG |
264 | { |
265 | int ret; | |
37278a1e | 266 | |
ffe60014 DG |
267 | assert(ua_sess); |
268 | assert(ua_chan); | |
269 | assert(consumer); | |
270 | assert(socket); | |
7972aab2 | 271 | assert(registry); |
f50f23d9 | 272 | |
d9078d0c DG |
273 | if (!consumer->enabled) { |
274 | ret = -LTTNG_ERR_NO_CONSUMER; | |
275 | DBG3("Consumer is disabled"); | |
276 | goto error; | |
277 | } | |
278 | ||
ffe60014 | 279 | pthread_mutex_lock(socket->lock); |
e098433c | 280 | ret = ask_channel_creation(ua_sess, ua_chan, consumer, socket, registry, |
d2956687 | 281 | trace_chunk); |
2898de39 | 282 | pthread_mutex_unlock(socket->lock); |
37278a1e | 283 | if (ret < 0) { |
e9404c27 | 284 | ERR("ask_channel_creation consumer command failed"); |
37278a1e DG |
285 | goto error; |
286 | } | |
287 | ||
48842b30 DG |
288 | error: |
289 | return ret; | |
290 | } | |
291 | ||
292 | /* | |
ffe60014 DG |
293 | * Send a get channel command to consumer using the given channel key. The |
294 | * channel object is populated and the stream list. | |
295 | * | |
296 | * Return 0 on success else a negative value. | |
48842b30 | 297 | */ |
ffe60014 DG |
298 | int ust_consumer_get_channel(struct consumer_socket *socket, |
299 | struct ust_app_channel *ua_chan) | |
48842b30 | 300 | { |
ffe60014 | 301 | int ret; |
37278a1e | 302 | struct lttcomm_consumer_msg msg; |
48842b30 | 303 | |
ffe60014 DG |
304 | assert(ua_chan); |
305 | assert(socket); | |
48842b30 | 306 | |
53efb85a | 307 | memset(&msg, 0, sizeof(msg)); |
ffe60014 DG |
308 | msg.cmd_type = LTTNG_CONSUMER_GET_CHANNEL; |
309 | msg.u.get_channel.key = ua_chan->key; | |
37278a1e | 310 | |
ffe60014 | 311 | pthread_mutex_lock(socket->lock); |
840cb59c | 312 | health_code_update(); |
ca03de58 | 313 | |
ffe60014 DG |
314 | /* Send command and wait for OK reply. */ |
315 | ret = consumer_send_msg(socket, &msg); | |
37278a1e DG |
316 | if (ret < 0) { |
317 | goto error; | |
318 | } | |
319 | ||
ffe60014 | 320 | /* First, get the channel from consumer. */ |
9363801e | 321 | ret = ustctl_recv_channel_from_consumer(*socket->fd_ptr, &ua_chan->obj); |
37278a1e | 322 | if (ret < 0) { |
ffe60014 DG |
323 | if (ret != -EPIPE) { |
324 | ERR("Error recv channel from consumer %d with ret %d", | |
9363801e | 325 | *socket->fd_ptr, ret); |
ffe60014 DG |
326 | } else { |
327 | DBG3("UST app recv channel from consumer. Consumer is dead."); | |
328 | } | |
37278a1e DG |
329 | goto error; |
330 | } | |
00e2e675 | 331 | |
ffe60014 DG |
332 | /* Next, get all streams. */ |
333 | while (1) { | |
334 | struct ust_app_stream *stream; | |
ca03de58 | 335 | |
ffe60014 DG |
336 | /* Create UST stream */ |
337 | stream = ust_app_alloc_stream(); | |
338 | if (stream == NULL) { | |
339 | ret = -ENOMEM; | |
48842b30 DG |
340 | goto error; |
341 | } | |
342 | ||
ffe60014 | 343 | /* Stream object is populated by this call if successful. */ |
9363801e | 344 | ret = ustctl_recv_stream_from_consumer(*socket->fd_ptr, &stream->obj); |
37278a1e | 345 | if (ret < 0) { |
ffe60014 DG |
346 | free(stream); |
347 | if (ret == -LTTNG_UST_ERR_NOENT) { | |
348 | DBG3("UST app consumer has no more stream available"); | |
ffe60014 DG |
349 | break; |
350 | } | |
351 | if (ret != -EPIPE) { | |
352 | ERR("Recv stream from consumer %d with ret %d", | |
9363801e | 353 | *socket->fd_ptr, ret); |
ffe60014 DG |
354 | } else { |
355 | DBG3("UST app recv stream from consumer. Consumer is dead."); | |
00e2e675 | 356 | } |
48842b30 DG |
357 | goto error; |
358 | } | |
37278a1e | 359 | |
ffe60014 DG |
360 | /* Order is important this is why a list is used. */ |
361 | cds_list_add_tail(&stream->list, &ua_chan->streams.head); | |
362 | ua_chan->streams.count++; | |
37278a1e | 363 | |
5368d366 | 364 | DBG2("UST app stream %d received successfully", ua_chan->streams.count); |
ffe60014 DG |
365 | } |
366 | ||
367 | /* This MUST match or else we have a synchronization problem. */ | |
368 | assert(ua_chan->expected_stream_count == ua_chan->streams.count); | |
ca03de58 | 369 | |
ffe60014 DG |
370 | /* Wait for confirmation that we can proceed with the streams. */ |
371 | ret = consumer_recv_status_reply(socket); | |
37278a1e DG |
372 | if (ret < 0) { |
373 | goto error; | |
374 | } | |
375 | ||
376 | error: | |
ffe60014 DG |
377 | health_code_update(); |
378 | pthread_mutex_unlock(socket->lock); | |
37278a1e DG |
379 | return ret; |
380 | } | |
381 | ||
382 | /* | |
ffe60014 DG |
383 | * Send a destroy channel command to consumer using the given channel key. |
384 | * | |
385 | * Note that this command MUST be used prior to a successful | |
386 | * LTTNG_CONSUMER_GET_CHANNEL because once this command is done successfully, | |
387 | * the streams are dispatched to the consumer threads and MUST be teardown | |
388 | * through the hang up process. | |
389 | * | |
390 | * Return 0 on success else a negative value. | |
37278a1e | 391 | */ |
ffe60014 DG |
392 | int ust_consumer_destroy_channel(struct consumer_socket *socket, |
393 | struct ust_app_channel *ua_chan) | |
37278a1e | 394 | { |
ffe60014 DG |
395 | int ret; |
396 | struct lttcomm_consumer_msg msg; | |
a4b92340 | 397 | |
ffe60014 DG |
398 | assert(ua_chan); |
399 | assert(socket); | |
37278a1e | 400 | |
53efb85a | 401 | memset(&msg, 0, sizeof(msg)); |
ffe60014 DG |
402 | msg.cmd_type = LTTNG_CONSUMER_DESTROY_CHANNEL; |
403 | msg.u.destroy_channel.key = ua_chan->key; | |
173af62f | 404 | |
ffe60014 DG |
405 | pthread_mutex_lock(socket->lock); |
406 | health_code_update(); | |
37278a1e | 407 | |
ffe60014 | 408 | ret = consumer_send_msg(socket, &msg); |
37278a1e DG |
409 | if (ret < 0) { |
410 | goto error; | |
48842b30 DG |
411 | } |
412 | ||
ffe60014 DG |
413 | error: |
414 | health_code_update(); | |
415 | pthread_mutex_unlock(socket->lock); | |
416 | return ret; | |
417 | } | |
aeb96892 | 418 | |
ffe60014 DG |
419 | /* |
420 | * Send a given stream to UST tracer. | |
421 | * | |
422 | * On success return 0 else a negative value. | |
423 | */ | |
424 | int ust_consumer_send_stream_to_ust(struct ust_app *app, | |
425 | struct ust_app_channel *channel, struct ust_app_stream *stream) | |
426 | { | |
427 | int ret; | |
428 | ||
429 | assert(app); | |
430 | assert(stream); | |
431 | assert(channel); | |
432 | ||
433 | DBG2("UST consumer send stream to app %d", app->sock); | |
434 | ||
435 | /* Relay stream to application. */ | |
fb45065e | 436 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 437 | ret = ustctl_send_stream_to_ust(app->sock, channel->obj, stream->obj); |
fb45065e | 438 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
439 | if (ret < 0) { |
440 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
8cf93def DG |
441 | ERR("ustctl send stream handle %d to app pid: %d with ret %d", |
442 | stream->obj->handle, app->pid, ret); | |
ffe60014 DG |
443 | } else { |
444 | DBG3("UST app send stream to ust failed. Application is dead."); | |
48842b30 | 445 | } |
ffe60014 | 446 | goto error; |
48842b30 | 447 | } |
d0b96690 | 448 | channel->handle = channel->obj->handle; |
48842b30 | 449 | |
ffe60014 DG |
450 | error: |
451 | return ret; | |
452 | } | |
453 | ||
454 | /* | |
455 | * Send channel previously received from the consumer to the UST tracer. | |
456 | * | |
457 | * On success return 0 else a negative value. | |
458 | */ | |
459 | int ust_consumer_send_channel_to_ust(struct ust_app *app, | |
460 | struct ust_app_session *ua_sess, struct ust_app_channel *channel) | |
461 | { | |
462 | int ret; | |
463 | ||
464 | assert(app); | |
465 | assert(ua_sess); | |
466 | assert(channel); | |
467 | assert(channel->obj); | |
468 | ||
7972aab2 DG |
469 | DBG2("UST app send channel to sock %d pid %d (name: %s, key: %" PRIu64 ")", |
470 | app->sock, app->pid, channel->name, channel->tracing_channel_id); | |
48842b30 | 471 | |
ffe60014 | 472 | /* Send stream to application. */ |
fb45065e | 473 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 474 | ret = ustctl_send_channel_to_ust(app->sock, ua_sess->handle, channel->obj); |
fb45065e | 475 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
476 | if (ret < 0) { |
477 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
478 | ERR("Error ustctl send channel %s to app pid: %d with ret %d", | |
479 | channel->name, app->pid, ret); | |
480 | } else { | |
481 | DBG3("UST app send channel to ust failed. Application is dead."); | |
482 | } | |
483 | goto error; | |
484 | } | |
48842b30 DG |
485 | |
486 | error: | |
487 | return ret; | |
488 | } | |
331744e3 JD |
489 | |
490 | /* | |
491 | * Handle the metadata requests from the UST consumer | |
492 | * | |
493 | * Return 0 on success else a negative value. | |
494 | */ | |
495 | int ust_consumer_metadata_request(struct consumer_socket *socket) | |
496 | { | |
497 | int ret; | |
498 | ssize_t ret_push; | |
499 | struct lttcomm_metadata_request_msg request; | |
500 | struct buffer_reg_uid *reg_uid; | |
501 | struct ust_registry_session *ust_reg; | |
502 | struct lttcomm_consumer_msg msg; | |
503 | ||
504 | assert(socket); | |
505 | ||
506 | rcu_read_lock(); | |
331744e3 JD |
507 | health_code_update(); |
508 | ||
509 | /* Wait for a metadata request */ | |
dc2bbdae | 510 | pthread_mutex_lock(socket->lock); |
52898cb1 | 511 | ret = consumer_socket_recv(socket, &request, sizeof(request)); |
dc2bbdae | 512 | pthread_mutex_unlock(socket->lock); |
52898cb1 | 513 | if (ret < 0) { |
331744e3 JD |
514 | goto end; |
515 | } | |
516 | ||
1950109e | 517 | DBG("Metadata request received for session %" PRIu64 ", key %" PRIu64, |
331744e3 JD |
518 | request.session_id, request.key); |
519 | ||
520 | reg_uid = buffer_reg_uid_find(request.session_id, | |
521 | request.bits_per_long, request.uid); | |
522 | if (reg_uid) { | |
523 | ust_reg = reg_uid->registry->reg.ust; | |
524 | } else { | |
525 | struct buffer_reg_pid *reg_pid = | |
1950109e | 526 | buffer_reg_pid_find(request.session_id_per_pid); |
331744e3 | 527 | if (!reg_pid) { |
1950109e JD |
528 | DBG("PID registry not found for session id %" PRIu64, |
529 | request.session_id_per_pid); | |
331744e3 | 530 | |
53efb85a | 531 | memset(&msg, 0, sizeof(msg)); |
331744e3 | 532 | msg.cmd_type = LTTNG_ERR_UND; |
cb7d882c | 533 | pthread_mutex_lock(socket->lock); |
331744e3 | 534 | (void) consumer_send_msg(socket, &msg); |
cb7d882c | 535 | pthread_mutex_unlock(socket->lock); |
331744e3 JD |
536 | /* |
537 | * This is possible since the session might have been destroyed | |
538 | * during a consumer metadata request. So here, return gracefully | |
539 | * because the destroy session will push the remaining metadata to | |
540 | * the consumer. | |
541 | */ | |
542 | ret = 0; | |
543 | goto end; | |
544 | } | |
545 | ust_reg = reg_pid->registry->reg.ust; | |
546 | } | |
547 | assert(ust_reg); | |
548 | ||
dc2bbdae | 549 | pthread_mutex_lock(&ust_reg->lock); |
331744e3 | 550 | ret_push = ust_app_push_metadata(ust_reg, socket, 1); |
dc2bbdae | 551 | pthread_mutex_unlock(&ust_reg->lock); |
2c57e06d MD |
552 | if (ret_push == -EPIPE) { |
553 | DBG("Application or relay closed while pushing metadata"); | |
554 | } else if (ret_push < 0) { | |
331744e3 JD |
555 | ERR("Pushing metadata"); |
556 | ret = -1; | |
557 | goto end; | |
2c57e06d MD |
558 | } else { |
559 | DBG("UST Consumer metadata pushed successfully"); | |
331744e3 | 560 | } |
331744e3 JD |
561 | ret = 0; |
562 | ||
563 | end: | |
331744e3 JD |
564 | rcu_read_unlock(); |
565 | return ret; | |
566 | } |