Commit | Line | Data |
---|---|---|
48842b30 | 1 | /* |
21cf9b6b | 2 | * Copyright (C) 2011 EfficiOS Inc. |
48842b30 | 3 | * |
ab5be9fa | 4 | * SPDX-License-Identifier: GPL-2.0-only |
48842b30 | 5 | * |
48842b30 DG |
6 | */ |
7 | ||
6c1c0768 | 8 | #define _LGPL_SOURCE |
48842b30 DG |
9 | #include <stdio.h> |
10 | #include <stdlib.h> | |
11 | #include <string.h> | |
12 | #include <unistd.h> | |
d88aee68 | 13 | #include <inttypes.h> |
48842b30 | 14 | |
c9e313bc SM |
15 | #include <common/compat/errno.hpp> |
16 | #include <common/common.hpp> | |
17 | #include <common/consumer/consumer.hpp> | |
18 | #include <common/defaults.hpp> | |
48842b30 | 19 | |
c9e313bc SM |
20 | #include "consumer.hpp" |
21 | #include "health-sessiond.hpp" | |
22 | #include "ust-consumer.hpp" | |
23 | #include "lttng-ust-error.hpp" | |
24 | #include "buffer-registry.hpp" | |
25 | #include "session.hpp" | |
26 | #include "lttng-sessiond.hpp" | |
48842b30 | 27 | |
d7bfb9b0 JG |
28 | namespace lsu = lttng::sessiond::ust; |
29 | ||
37278a1e | 30 | /* |
e9404c27 | 31 | * Send a single channel to the consumer using command ASK_CHANNEL_CREATION. |
ffe60014 | 32 | * |
7972aab2 | 33 | * Consumer socket lock MUST be acquired before calling this. |
37278a1e | 34 | */ |
ffe60014 | 35 | static int ask_channel_creation(struct ust_app_session *ua_sess, |
e098433c JG |
36 | struct ust_app_channel *ua_chan, |
37 | struct consumer_output *consumer, | |
38 | struct consumer_socket *socket, | |
b0f2e8db | 39 | lsu::registry_session *registry, |
d2956687 | 40 | struct lttng_trace_chunk *trace_chunk) |
37278a1e | 41 | { |
0c759fc9 | 42 | int ret, output; |
7972aab2 DG |
43 | uint32_t chan_id; |
44 | uint64_t key, chan_reg_key; | |
ffe60014 | 45 | char *pathname = NULL; |
37278a1e | 46 | struct lttcomm_consumer_msg msg; |
d7ba1388 | 47 | char shm_path[PATH_MAX] = ""; |
3d071855 | 48 | char root_shm_path[PATH_MAX] = ""; |
d2956687 | 49 | bool is_local_trace; |
5da88b0f | 50 | size_t consumer_path_offset = 0; |
37278a1e | 51 | |
a0377dfe FD |
52 | LTTNG_ASSERT(ua_sess); |
53 | LTTNG_ASSERT(ua_chan); | |
54 | LTTNG_ASSERT(socket); | |
55 | LTTNG_ASSERT(consumer); | |
56 | LTTNG_ASSERT(registry); | |
ffe60014 DG |
57 | |
58 | DBG2("Asking UST consumer for channel"); | |
59 | ||
d2956687 JG |
60 | is_local_trace = consumer->net_seq_index == -1ULL; |
61 | /* Format the channel's path (relative to the current trace chunk). */ | |
5da88b0f MD |
62 | pathname = setup_channel_trace_path(consumer, ua_sess->path, |
63 | &consumer_path_offset); | |
d2956687 JG |
64 | if (!pathname) { |
65 | ret = -1; | |
66 | goto error; | |
67 | } | |
68 | ||
69 | if (is_local_trace && trace_chunk) { | |
70 | enum lttng_trace_chunk_status chunk_status; | |
71 | char *pathname_index; | |
72 | ||
73 | ret = asprintf(&pathname_index, "%s/" DEFAULT_INDEX_DIR, | |
74 | pathname); | |
75 | if (ret < 0) { | |
76 | ERR("Failed to format channel index directory"); | |
77 | ret = -1; | |
78 | goto error; | |
79 | } | |
80 | ||
81 | /* | |
82 | * Create the index subdirectory which will take care | |
83 | * of implicitly creating the channel's path. | |
84 | */ | |
85 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
86 | trace_chunk, pathname_index); | |
87 | free(pathname_index); | |
88 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
10a50311 JD |
89 | ret = -1; |
90 | goto error; | |
91 | } | |
ffe60014 DG |
92 | } |
93 | ||
7972aab2 DG |
94 | /* Depending on the buffer type, a different channel key is used. */ |
95 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
96 | chan_reg_key = ua_chan->tracing_channel_id; | |
97 | } else { | |
98 | chan_reg_key = ua_chan->key; | |
99 | } | |
100 | ||
fc4b93fa | 101 | if (ua_chan->attr.type == LTTNG_UST_ABI_CHAN_METADATA) { |
7972aab2 | 102 | chan_id = -1U; |
d7ba1388 MD |
103 | /* |
104 | * Metadata channels shm_path (buffers) are handled within | |
105 | * session daemon. Consumer daemon should not try to create | |
106 | * those buffer files. | |
107 | */ | |
7972aab2 | 108 | } else { |
d7bfb9b0 JG |
109 | { |
110 | auto locked_registry = registry->lock(); | |
4bcf2294 | 111 | auto& ust_reg_chan = registry->channel(chan_reg_key); |
d7bfb9b0 JG |
112 | |
113 | chan_id = ust_reg_chan.id; | |
114 | } | |
115 | ||
d7ba1388 MD |
116 | if (ua_sess->shm_path[0]) { |
117 | strncpy(shm_path, ua_sess->shm_path, sizeof(shm_path)); | |
118 | shm_path[sizeof(shm_path) - 1] = '\0'; | |
119 | strncat(shm_path, "/", | |
120 | sizeof(shm_path) - strlen(shm_path) - 1); | |
121 | strncat(shm_path, ua_chan->name, | |
122 | sizeof(shm_path) - strlen(shm_path) - 1); | |
123 | strncat(shm_path, "_", | |
124 | sizeof(shm_path) - strlen(shm_path) - 1); | |
125 | } | |
3d071855 MD |
126 | strncpy(root_shm_path, ua_sess->root_shm_path, sizeof(root_shm_path)); |
127 | root_shm_path[sizeof(root_shm_path) - 1] = '\0'; | |
7972aab2 DG |
128 | } |
129 | ||
0c759fc9 | 130 | switch (ua_chan->attr.output) { |
fc4b93fa | 131 | case LTTNG_UST_ABI_MMAP: |
0c759fc9 DG |
132 | default: |
133 | output = LTTNG_EVENT_MMAP; | |
134 | break; | |
135 | } | |
136 | ||
ffe60014 DG |
137 | consumer_init_ask_channel_comm_msg(&msg, |
138 | ua_chan->attr.subbuf_size, | |
139 | ua_chan->attr.num_subbuf, | |
140 | ua_chan->attr.overwrite, | |
141 | ua_chan->attr.switch_timer_interval, | |
142 | ua_chan->attr.read_timer_interval, | |
ecc48a90 | 143 | ua_sess->live_timer_interval, |
a2814ea7 | 144 | ua_sess->live_timer_interval != 0, |
e9404c27 | 145 | ua_chan->monitor_timer_interval, |
0c759fc9 | 146 | output, |
ffe60014 | 147 | (int) ua_chan->attr.type, |
7972aab2 | 148 | ua_sess->tracing_id, |
5da88b0f | 149 | &pathname[consumer_path_offset], |
ffe60014 | 150 | ua_chan->name, |
ffe60014 DG |
151 | consumer->net_seq_index, |
152 | ua_chan->key, | |
d7bfb9b0 | 153 | registry->uuid, |
1624d5b7 JD |
154 | chan_id, |
155 | ua_chan->tracefile_size, | |
2bba9e53 | 156 | ua_chan->tracefile_count, |
1950109e | 157 | ua_sess->id, |
567eb353 | 158 | ua_sess->output_traces, |
ff588497 | 159 | lttng_credentials_get_uid(&ua_sess->real_credentials), |
491d1539 | 160 | ua_chan->attr.blocking_timeout, |
e098433c | 161 | root_shm_path, shm_path, |
470cc211 JG |
162 | trace_chunk, |
163 | &ua_sess->effective_credentials); | |
37278a1e | 164 | |
840cb59c | 165 | health_code_update(); |
ca03de58 | 166 | |
52898cb1 | 167 | ret = consumer_socket_send(socket, &msg, sizeof(msg)); |
37278a1e DG |
168 | if (ret < 0) { |
169 | goto error; | |
170 | } | |
171 | ||
ffe60014 DG |
172 | ret = consumer_recv_status_channel(socket, &key, |
173 | &ua_chan->expected_stream_count); | |
174 | if (ret < 0) { | |
175 | goto error; | |
176 | } | |
177 | /* Communication protocol error. */ | |
a0377dfe | 178 | LTTNG_ASSERT(key == ua_chan->key); |
ffe60014 | 179 | /* We need at least one where 1 stream for 1 cpu. */ |
10a50311 | 180 | if (ua_sess->output_traces) { |
a0377dfe | 181 | LTTNG_ASSERT(ua_chan->expected_stream_count > 0); |
10a50311 | 182 | } |
ffe60014 | 183 | |
d88aee68 | 184 | DBG2("UST ask channel %" PRIu64 " successfully done with %u stream(s)", key, |
ffe60014 | 185 | ua_chan->expected_stream_count); |
ca03de58 | 186 | |
37278a1e | 187 | error: |
ffe60014 DG |
188 | free(pathname); |
189 | health_code_update(); | |
37278a1e DG |
190 | return ret; |
191 | } | |
192 | ||
193 | /* | |
ffe60014 DG |
194 | * Ask consumer to create a channel for a given session. |
195 | * | |
e9404c27 JG |
196 | * Session list and rcu read side locks must be held by the caller. |
197 | * | |
ffe60014 | 198 | * Returns 0 on success else a negative value. |
37278a1e | 199 | */ |
ffe60014 | 200 | int ust_consumer_ask_channel(struct ust_app_session *ua_sess, |
e098433c JG |
201 | struct ust_app_channel *ua_chan, |
202 | struct consumer_output *consumer, | |
203 | struct consumer_socket *socket, | |
b0f2e8db | 204 | lsu::registry_session *registry, |
d2956687 | 205 | struct lttng_trace_chunk * trace_chunk) |
37278a1e DG |
206 | { |
207 | int ret; | |
37278a1e | 208 | |
a0377dfe FD |
209 | LTTNG_ASSERT(ua_sess); |
210 | LTTNG_ASSERT(ua_chan); | |
211 | LTTNG_ASSERT(consumer); | |
212 | LTTNG_ASSERT(socket); | |
213 | LTTNG_ASSERT(registry); | |
f50f23d9 | 214 | |
d9078d0c DG |
215 | if (!consumer->enabled) { |
216 | ret = -LTTNG_ERR_NO_CONSUMER; | |
217 | DBG3("Consumer is disabled"); | |
218 | goto error; | |
219 | } | |
220 | ||
ffe60014 | 221 | pthread_mutex_lock(socket->lock); |
e098433c | 222 | ret = ask_channel_creation(ua_sess, ua_chan, consumer, socket, registry, |
d2956687 | 223 | trace_chunk); |
2898de39 | 224 | pthread_mutex_unlock(socket->lock); |
37278a1e | 225 | if (ret < 0) { |
e9404c27 | 226 | ERR("ask_channel_creation consumer command failed"); |
37278a1e DG |
227 | goto error; |
228 | } | |
229 | ||
48842b30 DG |
230 | error: |
231 | return ret; | |
232 | } | |
233 | ||
234 | /* | |
ffe60014 DG |
235 | * Send a get channel command to consumer using the given channel key. The |
236 | * channel object is populated and the stream list. | |
237 | * | |
238 | * Return 0 on success else a negative value. | |
48842b30 | 239 | */ |
ffe60014 DG |
240 | int ust_consumer_get_channel(struct consumer_socket *socket, |
241 | struct ust_app_channel *ua_chan) | |
48842b30 | 242 | { |
ffe60014 | 243 | int ret; |
37278a1e | 244 | struct lttcomm_consumer_msg msg; |
48842b30 | 245 | |
a0377dfe FD |
246 | LTTNG_ASSERT(ua_chan); |
247 | LTTNG_ASSERT(socket); | |
48842b30 | 248 | |
53efb85a | 249 | memset(&msg, 0, sizeof(msg)); |
ffe60014 DG |
250 | msg.cmd_type = LTTNG_CONSUMER_GET_CHANNEL; |
251 | msg.u.get_channel.key = ua_chan->key; | |
37278a1e | 252 | |
ffe60014 | 253 | pthread_mutex_lock(socket->lock); |
840cb59c | 254 | health_code_update(); |
ca03de58 | 255 | |
ffe60014 DG |
256 | /* Send command and wait for OK reply. */ |
257 | ret = consumer_send_msg(socket, &msg); | |
37278a1e DG |
258 | if (ret < 0) { |
259 | goto error; | |
260 | } | |
261 | ||
ffe60014 | 262 | /* First, get the channel from consumer. */ |
b623cb6a | 263 | ret = lttng_ust_ctl_recv_channel_from_consumer(*socket->fd_ptr, &ua_chan->obj); |
37278a1e | 264 | if (ret < 0) { |
ffe60014 DG |
265 | if (ret != -EPIPE) { |
266 | ERR("Error recv channel from consumer %d with ret %d", | |
9363801e | 267 | *socket->fd_ptr, ret); |
ffe60014 DG |
268 | } else { |
269 | DBG3("UST app recv channel from consumer. Consumer is dead."); | |
270 | } | |
37278a1e DG |
271 | goto error; |
272 | } | |
00e2e675 | 273 | |
ffe60014 DG |
274 | /* Next, get all streams. */ |
275 | while (1) { | |
276 | struct ust_app_stream *stream; | |
ca03de58 | 277 | |
ffe60014 DG |
278 | /* Create UST stream */ |
279 | stream = ust_app_alloc_stream(); | |
280 | if (stream == NULL) { | |
281 | ret = -ENOMEM; | |
48842b30 DG |
282 | goto error; |
283 | } | |
284 | ||
ffe60014 | 285 | /* Stream object is populated by this call if successful. */ |
b623cb6a | 286 | ret = lttng_ust_ctl_recv_stream_from_consumer(*socket->fd_ptr, &stream->obj); |
37278a1e | 287 | if (ret < 0) { |
ffe60014 DG |
288 | free(stream); |
289 | if (ret == -LTTNG_UST_ERR_NOENT) { | |
290 | DBG3("UST app consumer has no more stream available"); | |
ffe60014 DG |
291 | break; |
292 | } | |
293 | if (ret != -EPIPE) { | |
294 | ERR("Recv stream from consumer %d with ret %d", | |
9363801e | 295 | *socket->fd_ptr, ret); |
ffe60014 DG |
296 | } else { |
297 | DBG3("UST app recv stream from consumer. Consumer is dead."); | |
00e2e675 | 298 | } |
48842b30 DG |
299 | goto error; |
300 | } | |
37278a1e | 301 | |
ffe60014 DG |
302 | /* Order is important this is why a list is used. */ |
303 | cds_list_add_tail(&stream->list, &ua_chan->streams.head); | |
304 | ua_chan->streams.count++; | |
37278a1e | 305 | |
5368d366 | 306 | DBG2("UST app stream %d received successfully", ua_chan->streams.count); |
ffe60014 DG |
307 | } |
308 | ||
309 | /* This MUST match or else we have a synchronization problem. */ | |
a0377dfe | 310 | LTTNG_ASSERT(ua_chan->expected_stream_count == ua_chan->streams.count); |
ca03de58 | 311 | |
ffe60014 DG |
312 | /* Wait for confirmation that we can proceed with the streams. */ |
313 | ret = consumer_recv_status_reply(socket); | |
37278a1e DG |
314 | if (ret < 0) { |
315 | goto error; | |
316 | } | |
317 | ||
318 | error: | |
ffe60014 DG |
319 | health_code_update(); |
320 | pthread_mutex_unlock(socket->lock); | |
37278a1e DG |
321 | return ret; |
322 | } | |
323 | ||
324 | /* | |
ffe60014 DG |
325 | * Send a destroy channel command to consumer using the given channel key. |
326 | * | |
327 | * Note that this command MUST be used prior to a successful | |
328 | * LTTNG_CONSUMER_GET_CHANNEL because once this command is done successfully, | |
329 | * the streams are dispatched to the consumer threads and MUST be teardown | |
330 | * through the hang up process. | |
331 | * | |
332 | * Return 0 on success else a negative value. | |
37278a1e | 333 | */ |
ffe60014 DG |
334 | int ust_consumer_destroy_channel(struct consumer_socket *socket, |
335 | struct ust_app_channel *ua_chan) | |
37278a1e | 336 | { |
ffe60014 DG |
337 | int ret; |
338 | struct lttcomm_consumer_msg msg; | |
a4b92340 | 339 | |
a0377dfe FD |
340 | LTTNG_ASSERT(ua_chan); |
341 | LTTNG_ASSERT(socket); | |
37278a1e | 342 | |
53efb85a | 343 | memset(&msg, 0, sizeof(msg)); |
ffe60014 DG |
344 | msg.cmd_type = LTTNG_CONSUMER_DESTROY_CHANNEL; |
345 | msg.u.destroy_channel.key = ua_chan->key; | |
173af62f | 346 | |
ffe60014 DG |
347 | pthread_mutex_lock(socket->lock); |
348 | health_code_update(); | |
37278a1e | 349 | |
ffe60014 | 350 | ret = consumer_send_msg(socket, &msg); |
37278a1e DG |
351 | if (ret < 0) { |
352 | goto error; | |
48842b30 DG |
353 | } |
354 | ||
ffe60014 DG |
355 | error: |
356 | health_code_update(); | |
357 | pthread_mutex_unlock(socket->lock); | |
358 | return ret; | |
359 | } | |
aeb96892 | 360 | |
ffe60014 DG |
361 | /* |
362 | * Send a given stream to UST tracer. | |
363 | * | |
364 | * On success return 0 else a negative value. | |
365 | */ | |
366 | int ust_consumer_send_stream_to_ust(struct ust_app *app, | |
367 | struct ust_app_channel *channel, struct ust_app_stream *stream) | |
368 | { | |
369 | int ret; | |
370 | ||
a0377dfe FD |
371 | LTTNG_ASSERT(app); |
372 | LTTNG_ASSERT(stream); | |
373 | LTTNG_ASSERT(channel); | |
ffe60014 DG |
374 | |
375 | DBG2("UST consumer send stream to app %d", app->sock); | |
376 | ||
377 | /* Relay stream to application. */ | |
fb45065e | 378 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 379 | ret = lttng_ust_ctl_send_stream_to_ust(app->sock, channel->obj, stream->obj); |
fb45065e | 380 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 | 381 | if (ret < 0) { |
be355079 JR |
382 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
383 | DBG3("UST app send stream to ust failed. Application is dead. (pid: %d, sock: %d).", | |
384 | app->pid, app->sock); | |
385 | } else if (ret == -EAGAIN) { | |
386 | WARN("UST app send stream to ust failed. Communication time out (pid: %d, sock: %d).", | |
387 | app->pid, app->sock); | |
ffe60014 | 388 | } else { |
be355079 JR |
389 | ERR("UST app send stream, handle %d, to ust failed with ret %d (pid: %d, sock: %d).", |
390 | stream->obj->handle, ret, app->pid, | |
391 | app->sock); | |
48842b30 | 392 | } |
ffe60014 | 393 | goto error; |
48842b30 | 394 | } |
d0b96690 | 395 | channel->handle = channel->obj->handle; |
48842b30 | 396 | |
ffe60014 DG |
397 | error: |
398 | return ret; | |
399 | } | |
400 | ||
401 | /* | |
402 | * Send channel previously received from the consumer to the UST tracer. | |
403 | * | |
404 | * On success return 0 else a negative value. | |
405 | */ | |
406 | int ust_consumer_send_channel_to_ust(struct ust_app *app, | |
407 | struct ust_app_session *ua_sess, struct ust_app_channel *channel) | |
408 | { | |
409 | int ret; | |
410 | ||
a0377dfe FD |
411 | LTTNG_ASSERT(app); |
412 | LTTNG_ASSERT(ua_sess); | |
413 | LTTNG_ASSERT(channel); | |
414 | LTTNG_ASSERT(channel->obj); | |
ffe60014 | 415 | |
7972aab2 DG |
416 | DBG2("UST app send channel to sock %d pid %d (name: %s, key: %" PRIu64 ")", |
417 | app->sock, app->pid, channel->name, channel->tracing_channel_id); | |
48842b30 | 418 | |
ffe60014 | 419 | /* Send stream to application. */ |
fb45065e | 420 | pthread_mutex_lock(&app->sock_lock); |
b623cb6a | 421 | ret = lttng_ust_ctl_send_channel_to_ust(app->sock, ua_sess->handle, channel->obj); |
fb45065e | 422 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 | 423 | if (ret < 0) { |
be355079 JR |
424 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
425 | DBG3("UST app send channel to ust failed. Application is dead (pid: %d, sock: %d).", | |
426 | app->pid, app->sock); | |
427 | } else if (ret == -EAGAIN) { | |
428 | WARN("UST app send channel to ust failed. Communication timeout (pid: %d, sock: %d).", | |
429 | app->pid, app->sock); | |
ffe60014 | 430 | } else { |
be355079 JR |
431 | ERR("UST app send channel %s, to ust failed with ret %d (pid: %d, sock: %d).", |
432 | channel->name, ret, app->pid, | |
433 | app->sock); | |
ffe60014 DG |
434 | } |
435 | goto error; | |
436 | } | |
48842b30 DG |
437 | |
438 | error: | |
439 | return ret; | |
440 | } | |
331744e3 JD |
441 | |
442 | /* | |
443 | * Handle the metadata requests from the UST consumer | |
444 | * | |
445 | * Return 0 on success else a negative value. | |
446 | */ | |
447 | int ust_consumer_metadata_request(struct consumer_socket *socket) | |
448 | { | |
449 | int ret; | |
450 | ssize_t ret_push; | |
451 | struct lttcomm_metadata_request_msg request; | |
452 | struct buffer_reg_uid *reg_uid; | |
b0f2e8db | 453 | lsu::registry_session *ust_reg; |
331744e3 JD |
454 | struct lttcomm_consumer_msg msg; |
455 | ||
a0377dfe | 456 | LTTNG_ASSERT(socket); |
331744e3 JD |
457 | |
458 | rcu_read_lock(); | |
331744e3 JD |
459 | health_code_update(); |
460 | ||
461 | /* Wait for a metadata request */ | |
dc2bbdae | 462 | pthread_mutex_lock(socket->lock); |
52898cb1 | 463 | ret = consumer_socket_recv(socket, &request, sizeof(request)); |
dc2bbdae | 464 | pthread_mutex_unlock(socket->lock); |
52898cb1 | 465 | if (ret < 0) { |
331744e3 JD |
466 | goto end; |
467 | } | |
468 | ||
1950109e | 469 | DBG("Metadata request received for session %" PRIu64 ", key %" PRIu64, |
331744e3 JD |
470 | request.session_id, request.key); |
471 | ||
472 | reg_uid = buffer_reg_uid_find(request.session_id, | |
473 | request.bits_per_long, request.uid); | |
474 | if (reg_uid) { | |
475 | ust_reg = reg_uid->registry->reg.ust; | |
476 | } else { | |
477 | struct buffer_reg_pid *reg_pid = | |
1950109e | 478 | buffer_reg_pid_find(request.session_id_per_pid); |
331744e3 | 479 | if (!reg_pid) { |
1950109e JD |
480 | DBG("PID registry not found for session id %" PRIu64, |
481 | request.session_id_per_pid); | |
331744e3 | 482 | |
53efb85a | 483 | memset(&msg, 0, sizeof(msg)); |
331744e3 | 484 | msg.cmd_type = LTTNG_ERR_UND; |
cb7d882c | 485 | pthread_mutex_lock(socket->lock); |
331744e3 | 486 | (void) consumer_send_msg(socket, &msg); |
cb7d882c | 487 | pthread_mutex_unlock(socket->lock); |
331744e3 JD |
488 | /* |
489 | * This is possible since the session might have been destroyed | |
490 | * during a consumer metadata request. So here, return gracefully | |
491 | * because the destroy session will push the remaining metadata to | |
492 | * the consumer. | |
493 | */ | |
494 | ret = 0; | |
495 | goto end; | |
496 | } | |
497 | ust_reg = reg_pid->registry->reg.ust; | |
498 | } | |
a0377dfe | 499 | LTTNG_ASSERT(ust_reg); |
331744e3 | 500 | |
d7bfb9b0 JG |
501 | { |
502 | auto locked_ust_reg = ust_reg->lock(); | |
503 | ret_push = ust_app_push_metadata(locked_ust_reg, socket, 1); | |
504 | } | |
2c57e06d MD |
505 | if (ret_push == -EPIPE) { |
506 | DBG("Application or relay closed while pushing metadata"); | |
507 | } else if (ret_push < 0) { | |
331744e3 JD |
508 | ERR("Pushing metadata"); |
509 | ret = -1; | |
510 | goto end; | |
2c57e06d MD |
511 | } else { |
512 | DBG("UST Consumer metadata pushed successfully"); | |
331744e3 | 513 | } |
331744e3 JD |
514 | ret = 0; |
515 | ||
516 | end: | |
331744e3 JD |
517 | rcu_read_unlock(); |
518 | return ret; | |
519 | } |