Commit | Line | Data |
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3bd1e081 MD |
1 | /* |
2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> | |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
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. | |
3bd1e081 MD |
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. | |
3bd1e081 MD |
17 | */ |
18 | ||
19 | #define _GNU_SOURCE | |
6c1c0768 | 20 | #define _LGPL_SOURCE |
3bd1e081 | 21 | #include <assert.h> |
f02e1e8a | 22 | #include <lttng/ust-ctl.h> |
3bd1e081 MD |
23 | #include <poll.h> |
24 | #include <pthread.h> | |
25 | #include <stdlib.h> | |
26 | #include <string.h> | |
27 | #include <sys/mman.h> | |
28 | #include <sys/socket.h> | |
dbb5dfe6 | 29 | #include <sys/stat.h> |
3bd1e081 | 30 | #include <sys/types.h> |
77c7c900 | 31 | #include <inttypes.h> |
3bd1e081 | 32 | #include <unistd.h> |
ffe60014 | 33 | #include <urcu/list.h> |
331744e3 | 34 | #include <signal.h> |
0857097f | 35 | |
51a9e1c7 | 36 | #include <bin/lttng-consumerd/health-consumerd.h> |
990570ed | 37 | #include <common/common.h> |
10a8a223 | 38 | #include <common/sessiond-comm/sessiond-comm.h> |
00e2e675 | 39 | #include <common/relayd/relayd.h> |
dbb5dfe6 | 40 | #include <common/compat/fcntl.h> |
f263b7fd | 41 | #include <common/compat/endian.h> |
331744e3 | 42 | #include <common/consumer-metadata-cache.h> |
10a50311 | 43 | #include <common/consumer-stream.h> |
331744e3 | 44 | #include <common/consumer-timer.h> |
fe4477ee | 45 | #include <common/utils.h> |
309167d2 | 46 | #include <common/index/index.h> |
10a8a223 DG |
47 | |
48 | #include "ust-consumer.h" | |
3bd1e081 | 49 | |
f079a67f | 50 | #define INT_MAX_STR_LEN 12 /* includes \0 */ |
4628484a | 51 | |
3bd1e081 MD |
52 | extern struct lttng_consumer_global_data consumer_data; |
53 | extern int consumer_poll_timeout; | |
54 | extern volatile int consumer_quit; | |
55 | ||
56 | /* | |
ffe60014 DG |
57 | * Free channel object and all streams associated with it. This MUST be used |
58 | * only and only if the channel has _NEVER_ been added to the global channel | |
59 | * hash table. | |
3bd1e081 | 60 | */ |
ffe60014 | 61 | static void destroy_channel(struct lttng_consumer_channel *channel) |
3bd1e081 | 62 | { |
ffe60014 DG |
63 | struct lttng_consumer_stream *stream, *stmp; |
64 | ||
65 | assert(channel); | |
66 | ||
67 | DBG("UST consumer cleaning stream list"); | |
68 | ||
69 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
70 | send_node) { | |
9ce5646a MD |
71 | |
72 | health_code_update(); | |
73 | ||
ffe60014 DG |
74 | cds_list_del(&stream->send_node); |
75 | ustctl_destroy_stream(stream->ustream); | |
76 | free(stream); | |
77 | } | |
78 | ||
79 | /* | |
80 | * If a channel is available meaning that was created before the streams | |
81 | * were, delete it. | |
82 | */ | |
83 | if (channel->uchan) { | |
84 | lttng_ustconsumer_del_channel(channel); | |
11544fe5 | 85 | lttng_ustconsumer_free_channel(channel); |
ffe60014 DG |
86 | } |
87 | free(channel); | |
88 | } | |
3bd1e081 MD |
89 | |
90 | /* | |
ffe60014 | 91 | * Add channel to internal consumer state. |
3bd1e081 | 92 | * |
ffe60014 | 93 | * Returns 0 on success or else a negative value. |
3bd1e081 | 94 | */ |
ffe60014 DG |
95 | static int add_channel(struct lttng_consumer_channel *channel, |
96 | struct lttng_consumer_local_data *ctx) | |
3bd1e081 MD |
97 | { |
98 | int ret = 0; | |
99 | ||
ffe60014 DG |
100 | assert(channel); |
101 | assert(ctx); | |
102 | ||
103 | if (ctx->on_recv_channel != NULL) { | |
104 | ret = ctx->on_recv_channel(channel); | |
105 | if (ret == 0) { | |
d8ef542d | 106 | ret = consumer_add_channel(channel, ctx); |
ffe60014 DG |
107 | } else if (ret < 0) { |
108 | /* Most likely an ENOMEM. */ | |
109 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
110 | goto error; | |
111 | } | |
112 | } else { | |
d8ef542d | 113 | ret = consumer_add_channel(channel, ctx); |
3bd1e081 MD |
114 | } |
115 | ||
d88aee68 | 116 | DBG("UST consumer channel added (key: %" PRIu64 ")", channel->key); |
ffe60014 DG |
117 | |
118 | error: | |
3bd1e081 MD |
119 | return ret; |
120 | } | |
121 | ||
122 | /* | |
ffe60014 DG |
123 | * Allocate and return a consumer channel object. |
124 | */ | |
125 | static struct lttng_consumer_channel *allocate_channel(uint64_t session_id, | |
126 | const char *pathname, const char *name, uid_t uid, gid_t gid, | |
da009f2c | 127 | uint64_t relayd_id, uint64_t key, enum lttng_event_output output, |
2bba9e53 | 128 | uint64_t tracefile_size, uint64_t tracefile_count, |
ecc48a90 | 129 | uint64_t session_id_per_pid, unsigned int monitor, |
d7ba1388 | 130 | unsigned int live_timer_interval, |
3d071855 | 131 | const char *root_shm_path, const char *shm_path) |
ffe60014 DG |
132 | { |
133 | assert(pathname); | |
134 | assert(name); | |
135 | ||
1950109e JD |
136 | return consumer_allocate_channel(key, session_id, pathname, name, uid, |
137 | gid, relayd_id, output, tracefile_size, | |
d7ba1388 | 138 | tracefile_count, session_id_per_pid, monitor, |
3d071855 | 139 | live_timer_interval, root_shm_path, shm_path); |
ffe60014 DG |
140 | } |
141 | ||
142 | /* | |
143 | * Allocate and return a consumer stream object. If _alloc_ret is not NULL, the | |
144 | * error value if applicable is set in it else it is kept untouched. | |
3bd1e081 | 145 | * |
ffe60014 | 146 | * Return NULL on error else the newly allocated stream object. |
3bd1e081 | 147 | */ |
ffe60014 DG |
148 | static struct lttng_consumer_stream *allocate_stream(int cpu, int key, |
149 | struct lttng_consumer_channel *channel, | |
150 | struct lttng_consumer_local_data *ctx, int *_alloc_ret) | |
151 | { | |
152 | int alloc_ret; | |
153 | struct lttng_consumer_stream *stream = NULL; | |
154 | ||
155 | assert(channel); | |
156 | assert(ctx); | |
157 | ||
158 | stream = consumer_allocate_stream(channel->key, | |
159 | key, | |
160 | LTTNG_CONSUMER_ACTIVE_STREAM, | |
161 | channel->name, | |
162 | channel->uid, | |
163 | channel->gid, | |
164 | channel->relayd_id, | |
165 | channel->session_id, | |
166 | cpu, | |
167 | &alloc_ret, | |
4891ece8 DG |
168 | channel->type, |
169 | channel->monitor); | |
ffe60014 DG |
170 | if (stream == NULL) { |
171 | switch (alloc_ret) { | |
172 | case -ENOENT: | |
173 | /* | |
174 | * We could not find the channel. Can happen if cpu hotplug | |
175 | * happens while tearing down. | |
176 | */ | |
177 | DBG3("Could not find channel"); | |
178 | break; | |
179 | case -ENOMEM: | |
180 | case -EINVAL: | |
181 | default: | |
182 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
183 | break; | |
184 | } | |
185 | goto error; | |
186 | } | |
187 | ||
188 | stream->chan = channel; | |
189 | ||
190 | error: | |
191 | if (_alloc_ret) { | |
192 | *_alloc_ret = alloc_ret; | |
193 | } | |
194 | return stream; | |
195 | } | |
196 | ||
197 | /* | |
198 | * Send the given stream pointer to the corresponding thread. | |
199 | * | |
200 | * Returns 0 on success else a negative value. | |
201 | */ | |
202 | static int send_stream_to_thread(struct lttng_consumer_stream *stream, | |
203 | struct lttng_consumer_local_data *ctx) | |
204 | { | |
dae10966 DG |
205 | int ret; |
206 | struct lttng_pipe *stream_pipe; | |
ffe60014 DG |
207 | |
208 | /* Get the right pipe where the stream will be sent. */ | |
209 | if (stream->metadata_flag) { | |
5ab66908 MD |
210 | ret = consumer_add_metadata_stream(stream); |
211 | if (ret) { | |
212 | ERR("Consumer add metadata stream %" PRIu64 " failed.", | |
213 | stream->key); | |
214 | goto error; | |
215 | } | |
dae10966 | 216 | stream_pipe = ctx->consumer_metadata_pipe; |
ffe60014 | 217 | } else { |
5ab66908 MD |
218 | ret = consumer_add_data_stream(stream); |
219 | if (ret) { | |
220 | ERR("Consumer add stream %" PRIu64 " failed.", | |
221 | stream->key); | |
222 | goto error; | |
223 | } | |
dae10966 | 224 | stream_pipe = ctx->consumer_data_pipe; |
ffe60014 DG |
225 | } |
226 | ||
5ab66908 MD |
227 | /* |
228 | * From this point on, the stream's ownership has been moved away from | |
229 | * the channel and becomes globally visible. | |
230 | */ | |
231 | stream->globally_visible = 1; | |
232 | ||
dae10966 | 233 | ret = lttng_pipe_write(stream_pipe, &stream, sizeof(stream)); |
ffe60014 | 234 | if (ret < 0) { |
dae10966 DG |
235 | ERR("Consumer write %s stream to pipe %d", |
236 | stream->metadata_flag ? "metadata" : "data", | |
237 | lttng_pipe_get_writefd(stream_pipe)); | |
5ab66908 MD |
238 | if (stream->metadata_flag) { |
239 | consumer_del_stream_for_metadata(stream); | |
240 | } else { | |
241 | consumer_del_stream_for_data(stream); | |
242 | } | |
ffe60014 | 243 | } |
5ab66908 | 244 | error: |
ffe60014 DG |
245 | return ret; |
246 | } | |
247 | ||
4628484a MD |
248 | static |
249 | int get_stream_shm_path(char *stream_shm_path, const char *shm_path, int cpu) | |
250 | { | |
f079a67f | 251 | char cpu_nr[INT_MAX_STR_LEN]; /* int max len */ |
4628484a MD |
252 | int ret; |
253 | ||
254 | strncpy(stream_shm_path, shm_path, PATH_MAX); | |
255 | stream_shm_path[PATH_MAX - 1] = '\0'; | |
f079a67f | 256 | ret = snprintf(cpu_nr, INT_MAX_STR_LEN, "%i", cpu); |
51a9615b MD |
257 | if (ret < 0) { |
258 | PERROR("snprintf"); | |
4628484a MD |
259 | goto end; |
260 | } | |
261 | strncat(stream_shm_path, cpu_nr, | |
262 | PATH_MAX - strlen(stream_shm_path) - 1); | |
263 | ret = 0; | |
264 | end: | |
265 | return ret; | |
266 | } | |
267 | ||
d88aee68 DG |
268 | /* |
269 | * Create streams for the given channel using liblttng-ust-ctl. | |
270 | * | |
271 | * Return 0 on success else a negative value. | |
272 | */ | |
ffe60014 DG |
273 | static int create_ust_streams(struct lttng_consumer_channel *channel, |
274 | struct lttng_consumer_local_data *ctx) | |
275 | { | |
276 | int ret, cpu = 0; | |
277 | struct ustctl_consumer_stream *ustream; | |
278 | struct lttng_consumer_stream *stream; | |
279 | ||
280 | assert(channel); | |
281 | assert(ctx); | |
282 | ||
283 | /* | |
284 | * While a stream is available from ustctl. When NULL is returned, we've | |
285 | * reached the end of the possible stream for the channel. | |
286 | */ | |
287 | while ((ustream = ustctl_create_stream(channel->uchan, cpu))) { | |
288 | int wait_fd; | |
04ef1097 | 289 | int ust_metadata_pipe[2]; |
ffe60014 | 290 | |
9ce5646a MD |
291 | health_code_update(); |
292 | ||
04ef1097 MD |
293 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && channel->monitor) { |
294 | ret = utils_create_pipe_cloexec_nonblock(ust_metadata_pipe); | |
295 | if (ret < 0) { | |
296 | ERR("Create ust metadata poll pipe"); | |
297 | goto error; | |
298 | } | |
299 | wait_fd = ust_metadata_pipe[0]; | |
300 | } else { | |
301 | wait_fd = ustctl_stream_get_wait_fd(ustream); | |
302 | } | |
ffe60014 DG |
303 | |
304 | /* Allocate consumer stream object. */ | |
305 | stream = allocate_stream(cpu, wait_fd, channel, ctx, &ret); | |
306 | if (!stream) { | |
307 | goto error_alloc; | |
308 | } | |
309 | stream->ustream = ustream; | |
310 | /* | |
311 | * Store it so we can save multiple function calls afterwards since | |
312 | * this value is used heavily in the stream threads. This is UST | |
313 | * specific so this is why it's done after allocation. | |
314 | */ | |
315 | stream->wait_fd = wait_fd; | |
316 | ||
b31398bb DG |
317 | /* |
318 | * Increment channel refcount since the channel reference has now been | |
319 | * assigned in the allocation process above. | |
320 | */ | |
10a50311 JD |
321 | if (stream->chan->monitor) { |
322 | uatomic_inc(&stream->chan->refcount); | |
323 | } | |
b31398bb | 324 | |
ffe60014 DG |
325 | /* |
326 | * Order is important this is why a list is used. On error, the caller | |
327 | * should clean this list. | |
328 | */ | |
329 | cds_list_add_tail(&stream->send_node, &channel->streams.head); | |
330 | ||
331 | ret = ustctl_get_max_subbuf_size(stream->ustream, | |
332 | &stream->max_sb_size); | |
333 | if (ret < 0) { | |
334 | ERR("ustctl_get_max_subbuf_size failed for stream %s", | |
335 | stream->name); | |
336 | goto error; | |
337 | } | |
338 | ||
339 | /* Do actions once stream has been received. */ | |
340 | if (ctx->on_recv_stream) { | |
341 | ret = ctx->on_recv_stream(stream); | |
342 | if (ret < 0) { | |
343 | goto error; | |
344 | } | |
345 | } | |
346 | ||
d88aee68 | 347 | DBG("UST consumer add stream %s (key: %" PRIu64 ") with relayd id %" PRIu64, |
ffe60014 DG |
348 | stream->name, stream->key, stream->relayd_stream_id); |
349 | ||
350 | /* Set next CPU stream. */ | |
351 | channel->streams.count = ++cpu; | |
d88aee68 DG |
352 | |
353 | /* Keep stream reference when creating metadata. */ | |
354 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) { | |
355 | channel->metadata_stream = stream; | |
896e2816 JG |
356 | if (channel->monitor) { |
357 | /* Set metadata poll pipe if we created one */ | |
358 | memcpy(stream->ust_metadata_poll_pipe, | |
359 | ust_metadata_pipe, | |
360 | sizeof(ust_metadata_pipe)); | |
361 | } | |
d88aee68 | 362 | } |
ffe60014 DG |
363 | } |
364 | ||
365 | return 0; | |
366 | ||
367 | error: | |
368 | error_alloc: | |
369 | return ret; | |
370 | } | |
371 | ||
4628484a MD |
372 | /* |
373 | * create_posix_shm is never called concurrently within a process. | |
374 | */ | |
375 | static | |
376 | int create_posix_shm(void) | |
377 | { | |
378 | char tmp_name[NAME_MAX]; | |
379 | int shmfd, ret; | |
380 | ||
381 | ret = snprintf(tmp_name, NAME_MAX, "/ust-shm-consumer-%d", getpid()); | |
382 | if (ret < 0) { | |
383 | PERROR("snprintf"); | |
384 | return -1; | |
385 | } | |
386 | /* | |
387 | * Allocate shm, and immediately unlink its shm oject, keeping | |
388 | * only the file descriptor as a reference to the object. | |
389 | * We specifically do _not_ use the / at the beginning of the | |
390 | * pathname so that some OS implementations can keep it local to | |
391 | * the process (POSIX leaves this implementation-defined). | |
392 | */ | |
393 | shmfd = shm_open(tmp_name, O_CREAT | O_EXCL | O_RDWR, 0700); | |
394 | if (shmfd < 0) { | |
395 | PERROR("shm_open"); | |
396 | goto error_shm_open; | |
397 | } | |
398 | ret = shm_unlink(tmp_name); | |
399 | if (ret < 0 && errno != ENOENT) { | |
400 | PERROR("shm_unlink"); | |
401 | goto error_shm_release; | |
402 | } | |
403 | return shmfd; | |
404 | ||
405 | error_shm_release: | |
406 | ret = close(shmfd); | |
407 | if (ret) { | |
408 | PERROR("close"); | |
409 | } | |
410 | error_shm_open: | |
411 | return -1; | |
412 | } | |
413 | ||
414 | static int open_ust_stream_fd(struct lttng_consumer_channel *channel, | |
415 | struct ustctl_consumer_channel_attr *attr, | |
416 | int cpu) | |
417 | { | |
418 | char shm_path[PATH_MAX]; | |
419 | int ret; | |
420 | ||
421 | if (!channel->shm_path[0]) { | |
422 | return create_posix_shm(); | |
423 | } | |
424 | ret = get_stream_shm_path(shm_path, channel->shm_path, cpu); | |
425 | if (ret) { | |
426 | goto error_shm_path; | |
427 | } | |
428 | return run_as_open(shm_path, | |
429 | O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR, | |
430 | channel->uid, channel->gid); | |
431 | ||
432 | error_shm_path: | |
433 | return -1; | |
434 | } | |
435 | ||
ffe60014 DG |
436 | /* |
437 | * Create an UST channel with the given attributes and send it to the session | |
438 | * daemon using the ust ctl API. | |
439 | * | |
440 | * Return 0 on success or else a negative value. | |
441 | */ | |
4628484a MD |
442 | static int create_ust_channel(struct lttng_consumer_channel *channel, |
443 | struct ustctl_consumer_channel_attr *attr, | |
444 | struct ustctl_consumer_channel **ust_chanp) | |
ffe60014 | 445 | { |
4628484a MD |
446 | int ret, nr_stream_fds, i, j; |
447 | int *stream_fds; | |
448 | struct ustctl_consumer_channel *ust_channel; | |
ffe60014 | 449 | |
4628484a | 450 | assert(channel); |
ffe60014 | 451 | assert(attr); |
4628484a | 452 | assert(ust_chanp); |
ffe60014 DG |
453 | |
454 | DBG3("Creating channel to ustctl with attr: [overwrite: %d, " | |
455 | "subbuf_size: %" PRIu64 ", num_subbuf: %" PRIu64 ", " | |
456 | "switch_timer_interval: %u, read_timer_interval: %u, " | |
457 | "output: %d, type: %d", attr->overwrite, attr->subbuf_size, | |
458 | attr->num_subbuf, attr->switch_timer_interval, | |
459 | attr->read_timer_interval, attr->output, attr->type); | |
460 | ||
4628484a MD |
461 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) |
462 | nr_stream_fds = 1; | |
463 | else | |
464 | nr_stream_fds = ustctl_get_nr_stream_per_channel(); | |
465 | stream_fds = zmalloc(nr_stream_fds * sizeof(*stream_fds)); | |
466 | if (!stream_fds) { | |
467 | ret = -1; | |
468 | goto error_alloc; | |
469 | } | |
470 | for (i = 0; i < nr_stream_fds; i++) { | |
471 | stream_fds[i] = open_ust_stream_fd(channel, attr, i); | |
472 | if (stream_fds[i] < 0) { | |
473 | ret = -1; | |
474 | goto error_open; | |
475 | } | |
476 | } | |
477 | ust_channel = ustctl_create_channel(attr, stream_fds, nr_stream_fds); | |
478 | if (!ust_channel) { | |
ffe60014 DG |
479 | ret = -1; |
480 | goto error_create; | |
481 | } | |
4628484a MD |
482 | channel->nr_stream_fds = nr_stream_fds; |
483 | channel->stream_fds = stream_fds; | |
484 | *ust_chanp = ust_channel; | |
ffe60014 DG |
485 | |
486 | return 0; | |
487 | ||
488 | error_create: | |
4628484a MD |
489 | error_open: |
490 | for (j = i - 1; j >= 0; j--) { | |
491 | int closeret; | |
492 | ||
493 | closeret = close(stream_fds[j]); | |
494 | if (closeret) { | |
495 | PERROR("close"); | |
496 | } | |
497 | if (channel->shm_path[0]) { | |
498 | char shm_path[PATH_MAX]; | |
499 | ||
500 | closeret = get_stream_shm_path(shm_path, | |
501 | channel->shm_path, j); | |
502 | if (closeret) { | |
503 | ERR("Cannot get stream shm path"); | |
504 | } | |
505 | closeret = run_as_unlink(shm_path, | |
506 | channel->uid, channel->gid); | |
507 | if (closeret) { | |
4628484a MD |
508 | PERROR("unlink %s", shm_path); |
509 | } | |
510 | } | |
511 | } | |
512 | /* Try to rmdir all directories under shm_path root. */ | |
513 | if (channel->root_shm_path[0]) { | |
514 | (void) run_as_recursive_rmdir(channel->root_shm_path, | |
515 | channel->uid, channel->gid); | |
516 | } | |
517 | free(stream_fds); | |
518 | error_alloc: | |
ffe60014 DG |
519 | return ret; |
520 | } | |
521 | ||
d88aee68 DG |
522 | /* |
523 | * Send a single given stream to the session daemon using the sock. | |
524 | * | |
525 | * Return 0 on success else a negative value. | |
526 | */ | |
ffe60014 DG |
527 | static int send_sessiond_stream(int sock, struct lttng_consumer_stream *stream) |
528 | { | |
529 | int ret; | |
530 | ||
531 | assert(stream); | |
532 | assert(sock >= 0); | |
533 | ||
3eb914c0 | 534 | DBG("UST consumer sending stream %" PRIu64 " to sessiond", stream->key); |
ffe60014 DG |
535 | |
536 | /* Send stream to session daemon. */ | |
537 | ret = ustctl_send_stream_to_sessiond(sock, stream->ustream); | |
538 | if (ret < 0) { | |
539 | goto error; | |
540 | } | |
541 | ||
ffe60014 DG |
542 | error: |
543 | return ret; | |
544 | } | |
545 | ||
546 | /* | |
547 | * Send channel to sessiond. | |
548 | * | |
d88aee68 | 549 | * Return 0 on success or else a negative value. |
ffe60014 DG |
550 | */ |
551 | static int send_sessiond_channel(int sock, | |
552 | struct lttng_consumer_channel *channel, | |
553 | struct lttng_consumer_local_data *ctx, int *relayd_error) | |
554 | { | |
0c759fc9 | 555 | int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
ffe60014 | 556 | struct lttng_consumer_stream *stream; |
a4baae1b | 557 | uint64_t net_seq_idx = -1ULL; |
ffe60014 DG |
558 | |
559 | assert(channel); | |
560 | assert(ctx); | |
561 | assert(sock >= 0); | |
562 | ||
563 | DBG("UST consumer sending channel %s to sessiond", channel->name); | |
564 | ||
62285ea4 DG |
565 | if (channel->relayd_id != (uint64_t) -1ULL) { |
566 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
567 | |
568 | health_code_update(); | |
569 | ||
62285ea4 DG |
570 | /* Try to send the stream to the relayd if one is available. */ |
571 | ret = consumer_send_relayd_stream(stream, stream->chan->pathname); | |
572 | if (ret < 0) { | |
573 | /* | |
574 | * Flag that the relayd was the problem here probably due to a | |
575 | * communicaton error on the socket. | |
576 | */ | |
577 | if (relayd_error) { | |
578 | *relayd_error = 1; | |
579 | } | |
725d28b2 | 580 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
ffe60014 | 581 | } |
a4baae1b JD |
582 | if (net_seq_idx == -1ULL) { |
583 | net_seq_idx = stream->net_seq_idx; | |
584 | } | |
585 | } | |
f2a444f1 | 586 | } |
ffe60014 | 587 | |
f2a444f1 DG |
588 | /* Inform sessiond that we are about to send channel and streams. */ |
589 | ret = consumer_send_status_msg(sock, ret_code); | |
0c759fc9 | 590 | if (ret < 0 || ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
f2a444f1 DG |
591 | /* |
592 | * Either the session daemon is not responding or the relayd died so we | |
593 | * stop now. | |
594 | */ | |
595 | goto error; | |
596 | } | |
597 | ||
598 | /* Send channel to sessiond. */ | |
599 | ret = ustctl_send_channel_to_sessiond(sock, channel->uchan); | |
600 | if (ret < 0) { | |
601 | goto error; | |
602 | } | |
603 | ||
604 | ret = ustctl_channel_close_wakeup_fd(channel->uchan); | |
605 | if (ret < 0) { | |
606 | goto error; | |
607 | } | |
608 | ||
609 | /* The channel was sent successfully to the sessiond at this point. */ | |
610 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
611 | |
612 | health_code_update(); | |
613 | ||
ffe60014 DG |
614 | /* Send stream to session daemon. */ |
615 | ret = send_sessiond_stream(sock, stream); | |
616 | if (ret < 0) { | |
617 | goto error; | |
618 | } | |
619 | } | |
620 | ||
621 | /* Tell sessiond there is no more stream. */ | |
622 | ret = ustctl_send_stream_to_sessiond(sock, NULL); | |
623 | if (ret < 0) { | |
624 | goto error; | |
625 | } | |
626 | ||
627 | DBG("UST consumer NULL stream sent to sessiond"); | |
628 | ||
629 | return 0; | |
630 | ||
631 | error: | |
0c759fc9 | 632 | if (ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
f2a444f1 DG |
633 | ret = -1; |
634 | } | |
ffe60014 DG |
635 | return ret; |
636 | } | |
637 | ||
638 | /* | |
639 | * Creates a channel and streams and add the channel it to the channel internal | |
640 | * state. The created stream must ONLY be sent once the GET_CHANNEL command is | |
641 | * received. | |
642 | * | |
643 | * Return 0 on success or else, a negative value is returned and the channel | |
644 | * MUST be destroyed by consumer_del_channel(). | |
645 | */ | |
646 | static int ask_channel(struct lttng_consumer_local_data *ctx, int sock, | |
647 | struct lttng_consumer_channel *channel, | |
648 | struct ustctl_consumer_channel_attr *attr) | |
3bd1e081 MD |
649 | { |
650 | int ret; | |
651 | ||
ffe60014 DG |
652 | assert(ctx); |
653 | assert(channel); | |
654 | assert(attr); | |
655 | ||
656 | /* | |
657 | * This value is still used by the kernel consumer since for the kernel, | |
658 | * the stream ownership is not IN the consumer so we need to have the | |
659 | * number of left stream that needs to be initialized so we can know when | |
660 | * to delete the channel (see consumer.c). | |
661 | * | |
662 | * As for the user space tracer now, the consumer creates and sends the | |
663 | * stream to the session daemon which only sends them to the application | |
664 | * once every stream of a channel is received making this value useless | |
665 | * because we they will be added to the poll thread before the application | |
666 | * receives them. This ensures that a stream can not hang up during | |
667 | * initilization of a channel. | |
668 | */ | |
669 | channel->nb_init_stream_left = 0; | |
670 | ||
671 | /* The reply msg status is handled in the following call. */ | |
4628484a | 672 | ret = create_ust_channel(channel, attr, &channel->uchan); |
ffe60014 | 673 | if (ret < 0) { |
10a50311 | 674 | goto end; |
3bd1e081 MD |
675 | } |
676 | ||
d8ef542d MD |
677 | channel->wait_fd = ustctl_channel_get_wait_fd(channel->uchan); |
678 | ||
10a50311 JD |
679 | /* |
680 | * For the snapshots (no monitor), we create the metadata streams | |
681 | * on demand, not during the channel creation. | |
682 | */ | |
683 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && !channel->monitor) { | |
684 | ret = 0; | |
685 | goto end; | |
686 | } | |
687 | ||
ffe60014 DG |
688 | /* Open all streams for this channel. */ |
689 | ret = create_ust_streams(channel, ctx); | |
690 | if (ret < 0) { | |
10a50311 | 691 | goto end; |
ffe60014 DG |
692 | } |
693 | ||
10a50311 | 694 | end: |
3bd1e081 MD |
695 | return ret; |
696 | } | |
697 | ||
d88aee68 DG |
698 | /* |
699 | * Send all stream of a channel to the right thread handling it. | |
700 | * | |
701 | * On error, return a negative value else 0 on success. | |
702 | */ | |
703 | static int send_streams_to_thread(struct lttng_consumer_channel *channel, | |
704 | struct lttng_consumer_local_data *ctx) | |
705 | { | |
706 | int ret = 0; | |
707 | struct lttng_consumer_stream *stream, *stmp; | |
708 | ||
709 | assert(channel); | |
710 | assert(ctx); | |
711 | ||
712 | /* Send streams to the corresponding thread. */ | |
713 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
714 | send_node) { | |
9ce5646a MD |
715 | |
716 | health_code_update(); | |
717 | ||
d88aee68 DG |
718 | /* Sending the stream to the thread. */ |
719 | ret = send_stream_to_thread(stream, ctx); | |
720 | if (ret < 0) { | |
721 | /* | |
722 | * If we are unable to send the stream to the thread, there is | |
723 | * a big problem so just stop everything. | |
724 | */ | |
5ab66908 MD |
725 | /* Remove node from the channel stream list. */ |
726 | cds_list_del(&stream->send_node); | |
d88aee68 DG |
727 | goto error; |
728 | } | |
729 | ||
730 | /* Remove node from the channel stream list. */ | |
731 | cds_list_del(&stream->send_node); | |
4891ece8 | 732 | |
d88aee68 DG |
733 | } |
734 | ||
735 | error: | |
736 | return ret; | |
737 | } | |
738 | ||
7972aab2 DG |
739 | /* |
740 | * Flush channel's streams using the given key to retrieve the channel. | |
741 | * | |
742 | * Return 0 on success else an LTTng error code. | |
743 | */ | |
744 | static int flush_channel(uint64_t chan_key) | |
745 | { | |
746 | int ret = 0; | |
747 | struct lttng_consumer_channel *channel; | |
748 | struct lttng_consumer_stream *stream; | |
749 | struct lttng_ht *ht; | |
750 | struct lttng_ht_iter iter; | |
751 | ||
8fd623e0 | 752 | DBG("UST consumer flush channel key %" PRIu64, chan_key); |
7972aab2 | 753 | |
a500c257 | 754 | rcu_read_lock(); |
7972aab2 DG |
755 | channel = consumer_find_channel(chan_key); |
756 | if (!channel) { | |
8fd623e0 | 757 | ERR("UST consumer flush channel %" PRIu64 " not found", chan_key); |
7972aab2 DG |
758 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
759 | goto error; | |
760 | } | |
761 | ||
762 | ht = consumer_data.stream_per_chan_id_ht; | |
763 | ||
764 | /* For each stream of the channel id, flush it. */ | |
7972aab2 DG |
765 | cds_lfht_for_each_entry_duplicate(ht->ht, |
766 | ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct, | |
767 | &channel->key, &iter.iter, stream, node_channel_id.node) { | |
9ce5646a MD |
768 | |
769 | health_code_update(); | |
770 | ||
f21fa4fd MD |
771 | pthread_mutex_lock(&stream->lock); |
772 | if (!stream->quiescent) { | |
773 | ustctl_flush_buffer(stream->ustream, 0); | |
774 | stream->quiescent = true; | |
775 | } | |
776 | pthread_mutex_unlock(&stream->lock); | |
777 | } | |
778 | error: | |
779 | rcu_read_unlock(); | |
780 | return ret; | |
781 | } | |
782 | ||
783 | /* | |
784 | * Clear quiescent state from channel's streams using the given key to | |
785 | * retrieve the channel. | |
786 | * | |
787 | * Return 0 on success else an LTTng error code. | |
788 | */ | |
789 | static int clear_quiescent_channel(uint64_t chan_key) | |
790 | { | |
791 | int ret = 0; | |
792 | struct lttng_consumer_channel *channel; | |
793 | struct lttng_consumer_stream *stream; | |
794 | struct lttng_ht *ht; | |
795 | struct lttng_ht_iter iter; | |
796 | ||
797 | DBG("UST consumer clear quiescent channel key %" PRIu64, chan_key); | |
798 | ||
799 | rcu_read_lock(); | |
800 | channel = consumer_find_channel(chan_key); | |
801 | if (!channel) { | |
802 | ERR("UST consumer clear quiescent channel %" PRIu64 " not found", chan_key); | |
803 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
804 | goto error; | |
805 | } | |
806 | ||
807 | ht = consumer_data.stream_per_chan_id_ht; | |
808 | ||
809 | /* For each stream of the channel id, clear quiescent state. */ | |
810 | cds_lfht_for_each_entry_duplicate(ht->ht, | |
811 | ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct, | |
812 | &channel->key, &iter.iter, stream, node_channel_id.node) { | |
813 | ||
814 | health_code_update(); | |
815 | ||
816 | pthread_mutex_lock(&stream->lock); | |
817 | stream->quiescent = false; | |
818 | pthread_mutex_unlock(&stream->lock); | |
7972aab2 | 819 | } |
7972aab2 | 820 | error: |
a500c257 | 821 | rcu_read_unlock(); |
7972aab2 DG |
822 | return ret; |
823 | } | |
824 | ||
d88aee68 DG |
825 | /* |
826 | * Close metadata stream wakeup_fd using the given key to retrieve the channel. | |
a500c257 | 827 | * RCU read side lock MUST be acquired before calling this function. |
d88aee68 DG |
828 | * |
829 | * Return 0 on success else an LTTng error code. | |
830 | */ | |
831 | static int close_metadata(uint64_t chan_key) | |
832 | { | |
ea88ca2a | 833 | int ret = 0; |
d88aee68 DG |
834 | struct lttng_consumer_channel *channel; |
835 | ||
8fd623e0 | 836 | DBG("UST consumer close metadata key %" PRIu64, chan_key); |
d88aee68 DG |
837 | |
838 | channel = consumer_find_channel(chan_key); | |
839 | if (!channel) { | |
84cc9aa0 DG |
840 | /* |
841 | * This is possible if the metadata thread has issue a delete because | |
842 | * the endpoint point of the stream hung up. There is no way the | |
843 | * session daemon can know about it thus use a DBG instead of an actual | |
844 | * error. | |
845 | */ | |
846 | DBG("UST consumer close metadata %" PRIu64 " not found", chan_key); | |
d88aee68 DG |
847 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
848 | goto error; | |
849 | } | |
850 | ||
ea88ca2a | 851 | pthread_mutex_lock(&consumer_data.lock); |
a9838785 | 852 | pthread_mutex_lock(&channel->lock); |
73811ecc DG |
853 | |
854 | if (cds_lfht_is_node_deleted(&channel->node.node)) { | |
855 | goto error_unlock; | |
856 | } | |
857 | ||
6d574024 | 858 | lttng_ustconsumer_close_metadata(channel); |
d88aee68 | 859 | |
ea88ca2a | 860 | error_unlock: |
a9838785 | 861 | pthread_mutex_unlock(&channel->lock); |
ea88ca2a | 862 | pthread_mutex_unlock(&consumer_data.lock); |
d88aee68 DG |
863 | error: |
864 | return ret; | |
865 | } | |
866 | ||
867 | /* | |
868 | * RCU read side lock MUST be acquired before calling this function. | |
869 | * | |
870 | * Return 0 on success else an LTTng error code. | |
871 | */ | |
872 | static int setup_metadata(struct lttng_consumer_local_data *ctx, uint64_t key) | |
873 | { | |
874 | int ret; | |
875 | struct lttng_consumer_channel *metadata; | |
876 | ||
8fd623e0 | 877 | DBG("UST consumer setup metadata key %" PRIu64, key); |
d88aee68 DG |
878 | |
879 | metadata = consumer_find_channel(key); | |
880 | if (!metadata) { | |
881 | ERR("UST consumer push metadata %" PRIu64 " not found", key); | |
882 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
10a50311 JD |
883 | goto end; |
884 | } | |
885 | ||
886 | /* | |
887 | * In no monitor mode, the metadata channel has no stream(s) so skip the | |
888 | * ownership transfer to the metadata thread. | |
889 | */ | |
890 | if (!metadata->monitor) { | |
891 | DBG("Metadata channel in no monitor"); | |
892 | ret = 0; | |
893 | goto end; | |
d88aee68 DG |
894 | } |
895 | ||
896 | /* | |
897 | * Send metadata stream to relayd if one available. Availability is | |
898 | * known if the stream is still in the list of the channel. | |
899 | */ | |
900 | if (cds_list_empty(&metadata->streams.head)) { | |
901 | ERR("Metadata channel key %" PRIu64 ", no stream available.", key); | |
902 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
f5a0c9cf | 903 | goto error_no_stream; |
d88aee68 DG |
904 | } |
905 | ||
906 | /* Send metadata stream to relayd if needed. */ | |
62285ea4 DG |
907 | if (metadata->metadata_stream->net_seq_idx != (uint64_t) -1ULL) { |
908 | ret = consumer_send_relayd_stream(metadata->metadata_stream, | |
909 | metadata->pathname); | |
910 | if (ret < 0) { | |
911 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
912 | goto error; | |
913 | } | |
601262d6 JD |
914 | ret = consumer_send_relayd_streams_sent( |
915 | metadata->metadata_stream->net_seq_idx); | |
916 | if (ret < 0) { | |
917 | ret = LTTCOMM_CONSUMERD_RELAYD_FAIL; | |
918 | goto error; | |
919 | } | |
d88aee68 DG |
920 | } |
921 | ||
922 | ret = send_streams_to_thread(metadata, ctx); | |
923 | if (ret < 0) { | |
924 | /* | |
925 | * If we are unable to send the stream to the thread, there is | |
926 | * a big problem so just stop everything. | |
927 | */ | |
928 | ret = LTTCOMM_CONSUMERD_FATAL; | |
929 | goto error; | |
930 | } | |
931 | /* List MUST be empty after or else it could be reused. */ | |
932 | assert(cds_list_empty(&metadata->streams.head)); | |
933 | ||
10a50311 JD |
934 | ret = 0; |
935 | goto end; | |
d88aee68 DG |
936 | |
937 | error: | |
f2a444f1 DG |
938 | /* |
939 | * Delete metadata channel on error. At this point, the metadata stream can | |
940 | * NOT be monitored by the metadata thread thus having the guarantee that | |
941 | * the stream is still in the local stream list of the channel. This call | |
942 | * will make sure to clean that list. | |
943 | */ | |
f5a0c9cf | 944 | consumer_stream_destroy(metadata->metadata_stream, NULL); |
212d67a2 DG |
945 | cds_list_del(&metadata->metadata_stream->send_node); |
946 | metadata->metadata_stream = NULL; | |
f5a0c9cf | 947 | error_no_stream: |
10a50311 JD |
948 | end: |
949 | return ret; | |
950 | } | |
951 | ||
952 | /* | |
953 | * Snapshot the whole metadata. | |
954 | * | |
955 | * Returns 0 on success, < 0 on error | |
956 | */ | |
957 | static int snapshot_metadata(uint64_t key, char *path, uint64_t relayd_id, | |
958 | struct lttng_consumer_local_data *ctx) | |
959 | { | |
960 | int ret = 0; | |
10a50311 JD |
961 | struct lttng_consumer_channel *metadata_channel; |
962 | struct lttng_consumer_stream *metadata_stream; | |
963 | ||
964 | assert(path); | |
965 | assert(ctx); | |
966 | ||
967 | DBG("UST consumer snapshot metadata with key %" PRIu64 " at path %s", | |
968 | key, path); | |
969 | ||
970 | rcu_read_lock(); | |
971 | ||
972 | metadata_channel = consumer_find_channel(key); | |
973 | if (!metadata_channel) { | |
6a00837f MD |
974 | ERR("UST snapshot metadata channel not found for key %" PRIu64, |
975 | key); | |
10a50311 JD |
976 | ret = -1; |
977 | goto error; | |
978 | } | |
979 | assert(!metadata_channel->monitor); | |
980 | ||
9ce5646a MD |
981 | health_code_update(); |
982 | ||
10a50311 JD |
983 | /* |
984 | * Ask the sessiond if we have new metadata waiting and update the | |
985 | * consumer metadata cache. | |
986 | */ | |
94d49140 | 987 | ret = lttng_ustconsumer_request_metadata(ctx, metadata_channel, 0, 1); |
10a50311 JD |
988 | if (ret < 0) { |
989 | goto error; | |
990 | } | |
991 | ||
9ce5646a MD |
992 | health_code_update(); |
993 | ||
10a50311 JD |
994 | /* |
995 | * The metadata stream is NOT created in no monitor mode when the channel | |
996 | * is created on a sessiond ask channel command. | |
997 | */ | |
998 | ret = create_ust_streams(metadata_channel, ctx); | |
999 | if (ret < 0) { | |
1000 | goto error; | |
1001 | } | |
1002 | ||
1003 | metadata_stream = metadata_channel->metadata_stream; | |
1004 | assert(metadata_stream); | |
1005 | ||
1006 | if (relayd_id != (uint64_t) -1ULL) { | |
1007 | metadata_stream->net_seq_idx = relayd_id; | |
1008 | ret = consumer_send_relayd_stream(metadata_stream, path); | |
1009 | if (ret < 0) { | |
1010 | goto error_stream; | |
1011 | } | |
1012 | } else { | |
1013 | ret = utils_create_stream_file(path, metadata_stream->name, | |
1014 | metadata_stream->chan->tracefile_size, | |
1015 | metadata_stream->tracefile_count_current, | |
309167d2 | 1016 | metadata_stream->uid, metadata_stream->gid, NULL); |
10a50311 JD |
1017 | if (ret < 0) { |
1018 | goto error_stream; | |
1019 | } | |
1020 | metadata_stream->out_fd = ret; | |
1021 | metadata_stream->tracefile_size_current = 0; | |
1022 | } | |
1023 | ||
04ef1097 | 1024 | do { |
9ce5646a MD |
1025 | health_code_update(); |
1026 | ||
10a50311 JD |
1027 | ret = lttng_consumer_read_subbuffer(metadata_stream, ctx); |
1028 | if (ret < 0) { | |
94d49140 | 1029 | goto error_stream; |
10a50311 | 1030 | } |
04ef1097 | 1031 | } while (ret > 0); |
10a50311 | 1032 | |
10a50311 JD |
1033 | error_stream: |
1034 | /* | |
1035 | * Clean up the stream completly because the next snapshot will use a new | |
1036 | * metadata stream. | |
1037 | */ | |
10a50311 | 1038 | consumer_stream_destroy(metadata_stream, NULL); |
212d67a2 | 1039 | cds_list_del(&metadata_stream->send_node); |
10a50311 JD |
1040 | metadata_channel->metadata_stream = NULL; |
1041 | ||
1042 | error: | |
1043 | rcu_read_unlock(); | |
1044 | return ret; | |
1045 | } | |
1046 | ||
1047 | /* | |
1048 | * Take a snapshot of all the stream of a channel. | |
1049 | * | |
1050 | * Returns 0 on success, < 0 on error | |
1051 | */ | |
1052 | static int snapshot_channel(uint64_t key, char *path, uint64_t relayd_id, | |
d07ceecd | 1053 | uint64_t nb_packets_per_stream, struct lttng_consumer_local_data *ctx) |
10a50311 JD |
1054 | { |
1055 | int ret; | |
1056 | unsigned use_relayd = 0; | |
1057 | unsigned long consumed_pos, produced_pos; | |
1058 | struct lttng_consumer_channel *channel; | |
1059 | struct lttng_consumer_stream *stream; | |
1060 | ||
1061 | assert(path); | |
1062 | assert(ctx); | |
1063 | ||
1064 | rcu_read_lock(); | |
1065 | ||
1066 | if (relayd_id != (uint64_t) -1ULL) { | |
1067 | use_relayd = 1; | |
1068 | } | |
1069 | ||
1070 | channel = consumer_find_channel(key); | |
1071 | if (!channel) { | |
6a00837f | 1072 | ERR("UST snapshot channel not found for key %" PRIu64, key); |
10a50311 JD |
1073 | ret = -1; |
1074 | goto error; | |
1075 | } | |
1076 | assert(!channel->monitor); | |
6a00837f | 1077 | DBG("UST consumer snapshot channel %" PRIu64, key); |
10a50311 JD |
1078 | |
1079 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
1080 | |
1081 | health_code_update(); | |
1082 | ||
10a50311 JD |
1083 | /* Lock stream because we are about to change its state. */ |
1084 | pthread_mutex_lock(&stream->lock); | |
1085 | stream->net_seq_idx = relayd_id; | |
1086 | ||
1087 | if (use_relayd) { | |
1088 | ret = consumer_send_relayd_stream(stream, path); | |
1089 | if (ret < 0) { | |
1090 | goto error_unlock; | |
1091 | } | |
1092 | } else { | |
1093 | ret = utils_create_stream_file(path, stream->name, | |
1094 | stream->chan->tracefile_size, | |
1095 | stream->tracefile_count_current, | |
309167d2 | 1096 | stream->uid, stream->gid, NULL); |
10a50311 JD |
1097 | if (ret < 0) { |
1098 | goto error_unlock; | |
1099 | } | |
1100 | stream->out_fd = ret; | |
1101 | stream->tracefile_size_current = 0; | |
1102 | ||
1103 | DBG("UST consumer snapshot stream %s/%s (%" PRIu64 ")", path, | |
1104 | stream->name, stream->key); | |
1105 | } | |
a4baae1b JD |
1106 | if (relayd_id != -1ULL) { |
1107 | ret = consumer_send_relayd_streams_sent(relayd_id); | |
1108 | if (ret < 0) { | |
1109 | goto error_unlock; | |
1110 | } | |
1111 | } | |
10a50311 | 1112 | |
de3fb857 MD |
1113 | /* |
1114 | * If tracing is active, we want to perform a "full" buffer flush. | |
1115 | * Else, if quiescent, it has already been done by the prior stop. | |
1116 | */ | |
1117 | if (!stream->quiescent) { | |
1118 | ustctl_flush_buffer(stream->ustream, 0); | |
1119 | } | |
10a50311 JD |
1120 | |
1121 | ret = lttng_ustconsumer_take_snapshot(stream); | |
1122 | if (ret < 0) { | |
1123 | ERR("Taking UST snapshot"); | |
1124 | goto error_unlock; | |
1125 | } | |
1126 | ||
1127 | ret = lttng_ustconsumer_get_produced_snapshot(stream, &produced_pos); | |
1128 | if (ret < 0) { | |
1129 | ERR("Produced UST snapshot position"); | |
1130 | goto error_unlock; | |
1131 | } | |
1132 | ||
1133 | ret = lttng_ustconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
1134 | if (ret < 0) { | |
1135 | ERR("Consumerd UST snapshot position"); | |
1136 | goto error_unlock; | |
1137 | } | |
1138 | ||
5c786ded JD |
1139 | /* |
1140 | * The original value is sent back if max stream size is larger than | |
d07ceecd | 1141 | * the possible size of the snapshot. Also, we assume that the session |
5c786ded JD |
1142 | * daemon should never send a maximum stream size that is lower than |
1143 | * subbuffer size. | |
1144 | */ | |
d07ceecd MD |
1145 | consumed_pos = consumer_get_consume_start_pos(consumed_pos, |
1146 | produced_pos, nb_packets_per_stream, | |
1147 | stream->max_sb_size); | |
5c786ded | 1148 | |
10a50311 JD |
1149 | while (consumed_pos < produced_pos) { |
1150 | ssize_t read_len; | |
1151 | unsigned long len, padded_len; | |
1152 | ||
9ce5646a MD |
1153 | health_code_update(); |
1154 | ||
10a50311 JD |
1155 | DBG("UST consumer taking snapshot at pos %lu", consumed_pos); |
1156 | ||
1157 | ret = ustctl_get_subbuf(stream->ustream, &consumed_pos); | |
1158 | if (ret < 0) { | |
1159 | if (ret != -EAGAIN) { | |
1160 | PERROR("ustctl_get_subbuf snapshot"); | |
1161 | goto error_close_stream; | |
1162 | } | |
1163 | DBG("UST consumer get subbuf failed. Skipping it."); | |
1164 | consumed_pos += stream->max_sb_size; | |
1165 | continue; | |
1166 | } | |
1167 | ||
1168 | ret = ustctl_get_subbuf_size(stream->ustream, &len); | |
1169 | if (ret < 0) { | |
1170 | ERR("Snapshot ustctl_get_subbuf_size"); | |
1171 | goto error_put_subbuf; | |
1172 | } | |
1173 | ||
1174 | ret = ustctl_get_padded_subbuf_size(stream->ustream, &padded_len); | |
1175 | if (ret < 0) { | |
1176 | ERR("Snapshot ustctl_get_padded_subbuf_size"); | |
1177 | goto error_put_subbuf; | |
1178 | } | |
1179 | ||
1180 | read_len = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, len, | |
309167d2 | 1181 | padded_len - len, NULL); |
10a50311 JD |
1182 | if (use_relayd) { |
1183 | if (read_len != len) { | |
56591bac | 1184 | ret = -EPERM; |
10a50311 JD |
1185 | goto error_put_subbuf; |
1186 | } | |
1187 | } else { | |
1188 | if (read_len != padded_len) { | |
56591bac | 1189 | ret = -EPERM; |
10a50311 JD |
1190 | goto error_put_subbuf; |
1191 | } | |
1192 | } | |
1193 | ||
1194 | ret = ustctl_put_subbuf(stream->ustream); | |
1195 | if (ret < 0) { | |
1196 | ERR("Snapshot ustctl_put_subbuf"); | |
1197 | goto error_close_stream; | |
1198 | } | |
1199 | consumed_pos += stream->max_sb_size; | |
1200 | } | |
1201 | ||
1202 | /* Simply close the stream so we can use it on the next snapshot. */ | |
1203 | consumer_stream_close(stream); | |
1204 | pthread_mutex_unlock(&stream->lock); | |
1205 | } | |
1206 | ||
1207 | rcu_read_unlock(); | |
1208 | return 0; | |
1209 | ||
1210 | error_put_subbuf: | |
1211 | if (ustctl_put_subbuf(stream->ustream) < 0) { | |
1212 | ERR("Snapshot ustctl_put_subbuf"); | |
1213 | } | |
1214 | error_close_stream: | |
1215 | consumer_stream_close(stream); | |
1216 | error_unlock: | |
1217 | pthread_mutex_unlock(&stream->lock); | |
1218 | error: | |
1219 | rcu_read_unlock(); | |
d88aee68 DG |
1220 | return ret; |
1221 | } | |
1222 | ||
331744e3 | 1223 | /* |
288bdb30 MD |
1224 | * Receive the metadata updates from the sessiond. Supports receiving |
1225 | * overlapping metadata, but is needs to always belong to a contiguous | |
1226 | * range starting from 0. | |
1227 | * Be careful about the locks held when calling this function: it needs | |
1228 | * the metadata cache flush to concurrently progress in order to | |
1229 | * complete. | |
331744e3 JD |
1230 | */ |
1231 | int lttng_ustconsumer_recv_metadata(int sock, uint64_t key, uint64_t offset, | |
5e41ebe1 | 1232 | uint64_t len, struct lttng_consumer_channel *channel, |
94d49140 | 1233 | int timer, int wait) |
331744e3 | 1234 | { |
0c759fc9 | 1235 | int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
331744e3 JD |
1236 | char *metadata_str; |
1237 | ||
8fd623e0 | 1238 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, len); |
331744e3 JD |
1239 | |
1240 | metadata_str = zmalloc(len * sizeof(char)); | |
1241 | if (!metadata_str) { | |
1242 | PERROR("zmalloc metadata string"); | |
1243 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; | |
1244 | goto end; | |
1245 | } | |
1246 | ||
9ce5646a MD |
1247 | health_code_update(); |
1248 | ||
331744e3 JD |
1249 | /* Receive metadata string. */ |
1250 | ret = lttcomm_recv_unix_sock(sock, metadata_str, len); | |
1251 | if (ret < 0) { | |
1252 | /* Session daemon is dead so return gracefully. */ | |
1253 | ret_code = ret; | |
1254 | goto end_free; | |
1255 | } | |
1256 | ||
9ce5646a MD |
1257 | health_code_update(); |
1258 | ||
331744e3 JD |
1259 | pthread_mutex_lock(&channel->metadata_cache->lock); |
1260 | ret = consumer_metadata_cache_write(channel, offset, len, metadata_str); | |
1261 | if (ret < 0) { | |
1262 | /* Unable to handle metadata. Notify session daemon. */ | |
1263 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
a32bd775 DG |
1264 | /* |
1265 | * Skip metadata flush on write error since the offset and len might | |
1266 | * not have been updated which could create an infinite loop below when | |
1267 | * waiting for the metadata cache to be flushed. | |
1268 | */ | |
1269 | pthread_mutex_unlock(&channel->metadata_cache->lock); | |
a32bd775 | 1270 | goto end_free; |
331744e3 JD |
1271 | } |
1272 | pthread_mutex_unlock(&channel->metadata_cache->lock); | |
1273 | ||
94d49140 JD |
1274 | if (!wait) { |
1275 | goto end_free; | |
1276 | } | |
5e41ebe1 | 1277 | while (consumer_metadata_cache_flushed(channel, offset + len, timer)) { |
331744e3 | 1278 | DBG("Waiting for metadata to be flushed"); |
9ce5646a MD |
1279 | |
1280 | health_code_update(); | |
1281 | ||
331744e3 JD |
1282 | usleep(DEFAULT_METADATA_AVAILABILITY_WAIT_TIME); |
1283 | } | |
1284 | ||
1285 | end_free: | |
1286 | free(metadata_str); | |
1287 | end: | |
1288 | return ret_code; | |
1289 | } | |
1290 | ||
4cbc1a04 DG |
1291 | /* |
1292 | * Receive command from session daemon and process it. | |
1293 | * | |
1294 | * Return 1 on success else a negative value or 0. | |
1295 | */ | |
3bd1e081 MD |
1296 | int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
1297 | int sock, struct pollfd *consumer_sockpoll) | |
1298 | { | |
1299 | ssize_t ret; | |
0c759fc9 | 1300 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
3bd1e081 | 1301 | struct lttcomm_consumer_msg msg; |
ffe60014 | 1302 | struct lttng_consumer_channel *channel = NULL; |
3bd1e081 | 1303 | |
9ce5646a MD |
1304 | health_code_update(); |
1305 | ||
3bd1e081 MD |
1306 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); |
1307 | if (ret != sizeof(msg)) { | |
173af62f DG |
1308 | DBG("Consumer received unexpected message size %zd (expects %zu)", |
1309 | ret, sizeof(msg)); | |
3be74084 DG |
1310 | /* |
1311 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
1312 | * since the caller handles this. | |
1313 | */ | |
489f70e9 | 1314 | if (ret > 0) { |
c6857fcf | 1315 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
489f70e9 MD |
1316 | ret = -1; |
1317 | } | |
3bd1e081 MD |
1318 | return ret; |
1319 | } | |
9ce5646a MD |
1320 | |
1321 | health_code_update(); | |
1322 | ||
84382d49 MD |
1323 | /* deprecated */ |
1324 | assert(msg.cmd_type != LTTNG_CONSUMER_STOP); | |
3bd1e081 | 1325 | |
9ce5646a MD |
1326 | health_code_update(); |
1327 | ||
3f8e211f | 1328 | /* relayd needs RCU read-side lock */ |
b0b335c8 MD |
1329 | rcu_read_lock(); |
1330 | ||
3bd1e081 | 1331 | switch (msg.cmd_type) { |
00e2e675 DG |
1332 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
1333 | { | |
f50f23d9 | 1334 | /* Session daemon status message are handled in the following call. */ |
7735ef9e DG |
1335 | ret = consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
1336 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, | |
d3e2ba59 JD |
1337 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id, |
1338 | msg.u.relayd_sock.relayd_session_id); | |
00e2e675 DG |
1339 | goto end_nosignal; |
1340 | } | |
173af62f DG |
1341 | case LTTNG_CONSUMER_DESTROY_RELAYD: |
1342 | { | |
a6ba4fe1 | 1343 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
173af62f DG |
1344 | struct consumer_relayd_sock_pair *relayd; |
1345 | ||
a6ba4fe1 | 1346 | DBG("UST consumer destroying relayd %" PRIu64, index); |
173af62f DG |
1347 | |
1348 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 1349 | relayd = consumer_find_relayd(index); |
173af62f | 1350 | if (relayd == NULL) { |
3448e266 | 1351 | DBG("Unable to find relayd %" PRIu64, index); |
e462382a | 1352 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
173af62f DG |
1353 | } |
1354 | ||
a6ba4fe1 DG |
1355 | /* |
1356 | * Each relayd socket pair has a refcount of stream attached to it | |
1357 | * which tells if the relayd is still active or not depending on the | |
1358 | * refcount value. | |
1359 | * | |
1360 | * This will set the destroy flag of the relayd object and destroy it | |
1361 | * if the refcount reaches zero when called. | |
1362 | * | |
1363 | * The destroy can happen either here or when a stream fd hangs up. | |
1364 | */ | |
f50f23d9 DG |
1365 | if (relayd) { |
1366 | consumer_flag_relayd_for_destroy(relayd); | |
1367 | } | |
1368 | ||
d88aee68 | 1369 | goto end_msg_sessiond; |
173af62f | 1370 | } |
3bd1e081 MD |
1371 | case LTTNG_CONSUMER_UPDATE_STREAM: |
1372 | { | |
3f8e211f | 1373 | rcu_read_unlock(); |
7ad0a0cb | 1374 | return -ENOSYS; |
3bd1e081 | 1375 | } |
6d805429 | 1376 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 1377 | { |
3be74084 | 1378 | int ret, is_data_pending; |
6d805429 | 1379 | uint64_t id = msg.u.data_pending.session_id; |
ca22feea | 1380 | |
6d805429 | 1381 | DBG("UST consumer data pending command for id %" PRIu64, id); |
ca22feea | 1382 | |
3be74084 | 1383 | is_data_pending = consumer_data_pending(id); |
ca22feea DG |
1384 | |
1385 | /* Send back returned value to session daemon */ | |
3be74084 DG |
1386 | ret = lttcomm_send_unix_sock(sock, &is_data_pending, |
1387 | sizeof(is_data_pending)); | |
ca22feea | 1388 | if (ret < 0) { |
3be74084 | 1389 | DBG("Error when sending the data pending ret code: %d", ret); |
489f70e9 | 1390 | goto error_fatal; |
ca22feea | 1391 | } |
f50f23d9 DG |
1392 | |
1393 | /* | |
1394 | * No need to send back a status message since the data pending | |
1395 | * returned value is the response. | |
1396 | */ | |
ca22feea | 1397 | break; |
53632229 | 1398 | } |
ffe60014 DG |
1399 | case LTTNG_CONSUMER_ASK_CHANNEL_CREATION: |
1400 | { | |
1401 | int ret; | |
1402 | struct ustctl_consumer_channel_attr attr; | |
1403 | ||
1404 | /* Create a plain object and reserve a channel key. */ | |
1405 | channel = allocate_channel(msg.u.ask_channel.session_id, | |
1406 | msg.u.ask_channel.pathname, msg.u.ask_channel.name, | |
1407 | msg.u.ask_channel.uid, msg.u.ask_channel.gid, | |
1408 | msg.u.ask_channel.relayd_id, msg.u.ask_channel.key, | |
1624d5b7 JD |
1409 | (enum lttng_event_output) msg.u.ask_channel.output, |
1410 | msg.u.ask_channel.tracefile_size, | |
2bba9e53 | 1411 | msg.u.ask_channel.tracefile_count, |
1950109e | 1412 | msg.u.ask_channel.session_id_per_pid, |
ecc48a90 | 1413 | msg.u.ask_channel.monitor, |
d7ba1388 | 1414 | msg.u.ask_channel.live_timer_interval, |
3d071855 | 1415 | msg.u.ask_channel.root_shm_path, |
d7ba1388 | 1416 | msg.u.ask_channel.shm_path); |
ffe60014 DG |
1417 | if (!channel) { |
1418 | goto end_channel_error; | |
1419 | } | |
1420 | ||
567eb353 DG |
1421 | /* |
1422 | * Assign UST application UID to the channel. This value is ignored for | |
1423 | * per PID buffers. This is specific to UST thus setting this after the | |
1424 | * allocation. | |
1425 | */ | |
1426 | channel->ust_app_uid = msg.u.ask_channel.ust_app_uid; | |
1427 | ||
ffe60014 DG |
1428 | /* Build channel attributes from received message. */ |
1429 | attr.subbuf_size = msg.u.ask_channel.subbuf_size; | |
1430 | attr.num_subbuf = msg.u.ask_channel.num_subbuf; | |
1431 | attr.overwrite = msg.u.ask_channel.overwrite; | |
1432 | attr.switch_timer_interval = msg.u.ask_channel.switch_timer_interval; | |
1433 | attr.read_timer_interval = msg.u.ask_channel.read_timer_interval; | |
7972aab2 | 1434 | attr.chan_id = msg.u.ask_channel.chan_id; |
ffe60014 DG |
1435 | memcpy(attr.uuid, msg.u.ask_channel.uuid, sizeof(attr.uuid)); |
1436 | ||
0c759fc9 DG |
1437 | /* Match channel buffer type to the UST abi. */ |
1438 | switch (msg.u.ask_channel.output) { | |
1439 | case LTTNG_EVENT_MMAP: | |
1440 | default: | |
1441 | attr.output = LTTNG_UST_MMAP; | |
1442 | break; | |
1443 | } | |
1444 | ||
ffe60014 DG |
1445 | /* Translate and save channel type. */ |
1446 | switch (msg.u.ask_channel.type) { | |
1447 | case LTTNG_UST_CHAN_PER_CPU: | |
1448 | channel->type = CONSUMER_CHANNEL_TYPE_DATA; | |
1449 | attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8633d6e3 MD |
1450 | /* |
1451 | * Set refcount to 1 for owner. Below, we will | |
1452 | * pass ownership to the | |
1453 | * consumer_thread_channel_poll() thread. | |
1454 | */ | |
1455 | channel->refcount = 1; | |
ffe60014 DG |
1456 | break; |
1457 | case LTTNG_UST_CHAN_METADATA: | |
1458 | channel->type = CONSUMER_CHANNEL_TYPE_METADATA; | |
1459 | attr.type = LTTNG_UST_CHAN_METADATA; | |
1460 | break; | |
1461 | default: | |
1462 | assert(0); | |
1463 | goto error_fatal; | |
1464 | }; | |
1465 | ||
9ce5646a MD |
1466 | health_code_update(); |
1467 | ||
ffe60014 DG |
1468 | ret = ask_channel(ctx, sock, channel, &attr); |
1469 | if (ret < 0) { | |
1470 | goto end_channel_error; | |
1471 | } | |
1472 | ||
fc643247 MD |
1473 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
1474 | ret = consumer_metadata_cache_allocate(channel); | |
1475 | if (ret < 0) { | |
1476 | ERR("Allocating metadata cache"); | |
1477 | goto end_channel_error; | |
1478 | } | |
1479 | consumer_timer_switch_start(channel, attr.switch_timer_interval); | |
1480 | attr.switch_timer_interval = 0; | |
94d49140 JD |
1481 | } else { |
1482 | consumer_timer_live_start(channel, | |
1483 | msg.u.ask_channel.live_timer_interval); | |
fc643247 MD |
1484 | } |
1485 | ||
9ce5646a MD |
1486 | health_code_update(); |
1487 | ||
ffe60014 DG |
1488 | /* |
1489 | * Add the channel to the internal state AFTER all streams were created | |
1490 | * and successfully sent to session daemon. This way, all streams must | |
1491 | * be ready before this channel is visible to the threads. | |
fc643247 MD |
1492 | * If add_channel succeeds, ownership of the channel is |
1493 | * passed to consumer_thread_channel_poll(). | |
ffe60014 DG |
1494 | */ |
1495 | ret = add_channel(channel, ctx); | |
1496 | if (ret < 0) { | |
ea88ca2a MD |
1497 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
1498 | if (channel->switch_timer_enabled == 1) { | |
1499 | consumer_timer_switch_stop(channel); | |
1500 | } | |
1501 | consumer_metadata_cache_destroy(channel); | |
1502 | } | |
d3e2ba59 JD |
1503 | if (channel->live_timer_enabled == 1) { |
1504 | consumer_timer_live_stop(channel); | |
1505 | } | |
ffe60014 DG |
1506 | goto end_channel_error; |
1507 | } | |
1508 | ||
9ce5646a MD |
1509 | health_code_update(); |
1510 | ||
ffe60014 DG |
1511 | /* |
1512 | * Channel and streams are now created. Inform the session daemon that | |
1513 | * everything went well and should wait to receive the channel and | |
1514 | * streams with ustctl API. | |
1515 | */ | |
1516 | ret = consumer_send_status_channel(sock, channel); | |
1517 | if (ret < 0) { | |
1518 | /* | |
489f70e9 | 1519 | * There is probably a problem on the socket. |
ffe60014 | 1520 | */ |
489f70e9 | 1521 | goto error_fatal; |
ffe60014 DG |
1522 | } |
1523 | ||
1524 | break; | |
1525 | } | |
1526 | case LTTNG_CONSUMER_GET_CHANNEL: | |
1527 | { | |
1528 | int ret, relayd_err = 0; | |
d88aee68 | 1529 | uint64_t key = msg.u.get_channel.key; |
ffe60014 | 1530 | struct lttng_consumer_channel *channel; |
ffe60014 DG |
1531 | |
1532 | channel = consumer_find_channel(key); | |
1533 | if (!channel) { | |
8fd623e0 | 1534 | ERR("UST consumer get channel key %" PRIu64 " not found", key); |
e462382a | 1535 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
ffe60014 DG |
1536 | goto end_msg_sessiond; |
1537 | } | |
1538 | ||
9ce5646a MD |
1539 | health_code_update(); |
1540 | ||
ffe60014 DG |
1541 | /* Send everything to sessiond. */ |
1542 | ret = send_sessiond_channel(sock, channel, ctx, &relayd_err); | |
1543 | if (ret < 0) { | |
1544 | if (relayd_err) { | |
1545 | /* | |
1546 | * We were unable to send to the relayd the stream so avoid | |
1547 | * sending back a fatal error to the thread since this is OK | |
f2a444f1 DG |
1548 | * and the consumer can continue its work. The above call |
1549 | * has sent the error status message to the sessiond. | |
ffe60014 | 1550 | */ |
f2a444f1 | 1551 | goto end_nosignal; |
ffe60014 DG |
1552 | } |
1553 | /* | |
1554 | * The communicaton was broken hence there is a bad state between | |
1555 | * the consumer and sessiond so stop everything. | |
1556 | */ | |
1557 | goto error_fatal; | |
1558 | } | |
1559 | ||
9ce5646a MD |
1560 | health_code_update(); |
1561 | ||
10a50311 JD |
1562 | /* |
1563 | * In no monitor mode, the streams ownership is kept inside the channel | |
1564 | * so don't send them to the data thread. | |
1565 | */ | |
1566 | if (!channel->monitor) { | |
1567 | goto end_msg_sessiond; | |
1568 | } | |
1569 | ||
d88aee68 DG |
1570 | ret = send_streams_to_thread(channel, ctx); |
1571 | if (ret < 0) { | |
1572 | /* | |
1573 | * If we are unable to send the stream to the thread, there is | |
1574 | * a big problem so just stop everything. | |
1575 | */ | |
1576 | goto error_fatal; | |
ffe60014 | 1577 | } |
ffe60014 DG |
1578 | /* List MUST be empty after or else it could be reused. */ |
1579 | assert(cds_list_empty(&channel->streams.head)); | |
d88aee68 DG |
1580 | goto end_msg_sessiond; |
1581 | } | |
1582 | case LTTNG_CONSUMER_DESTROY_CHANNEL: | |
1583 | { | |
1584 | uint64_t key = msg.u.destroy_channel.key; | |
d88aee68 | 1585 | |
a0cbdd2e MD |
1586 | /* |
1587 | * Only called if streams have not been sent to stream | |
1588 | * manager thread. However, channel has been sent to | |
1589 | * channel manager thread. | |
1590 | */ | |
1591 | notify_thread_del_channel(ctx, key); | |
d88aee68 | 1592 | goto end_msg_sessiond; |
ffe60014 | 1593 | } |
d88aee68 DG |
1594 | case LTTNG_CONSUMER_CLOSE_METADATA: |
1595 | { | |
1596 | int ret; | |
1597 | ||
1598 | ret = close_metadata(msg.u.close_metadata.key); | |
1599 | if (ret != 0) { | |
1600 | ret_code = ret; | |
1601 | } | |
1602 | ||
1603 | goto end_msg_sessiond; | |
1604 | } | |
7972aab2 DG |
1605 | case LTTNG_CONSUMER_FLUSH_CHANNEL: |
1606 | { | |
1607 | int ret; | |
1608 | ||
1609 | ret = flush_channel(msg.u.flush_channel.key); | |
1610 | if (ret != 0) { | |
1611 | ret_code = ret; | |
1612 | } | |
1613 | ||
1614 | goto end_msg_sessiond; | |
1615 | } | |
f21fa4fd MD |
1616 | case LTTNG_CONSUMER_CLEAR_QUIESCENT_CHANNEL: |
1617 | { | |
1618 | int ret; | |
1619 | ||
1620 | ret = clear_quiescent_channel( | |
1621 | msg.u.clear_quiescent_channel.key); | |
1622 | if (ret != 0) { | |
1623 | ret_code = ret; | |
1624 | } | |
1625 | ||
1626 | goto end_msg_sessiond; | |
1627 | } | |
d88aee68 | 1628 | case LTTNG_CONSUMER_PUSH_METADATA: |
ffe60014 DG |
1629 | { |
1630 | int ret; | |
d88aee68 | 1631 | uint64_t len = msg.u.push_metadata.len; |
d88aee68 | 1632 | uint64_t key = msg.u.push_metadata.key; |
331744e3 | 1633 | uint64_t offset = msg.u.push_metadata.target_offset; |
ffe60014 DG |
1634 | struct lttng_consumer_channel *channel; |
1635 | ||
8fd623e0 DG |
1636 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, |
1637 | len); | |
ffe60014 DG |
1638 | |
1639 | channel = consumer_find_channel(key); | |
1640 | if (!channel) { | |
000baf6a DG |
1641 | /* |
1642 | * This is possible if the metadata creation on the consumer side | |
1643 | * is in flight vis-a-vis a concurrent push metadata from the | |
1644 | * session daemon. Simply return that the channel failed and the | |
1645 | * session daemon will handle that message correctly considering | |
1646 | * that this race is acceptable thus the DBG() statement here. | |
1647 | */ | |
1648 | DBG("UST consumer push metadata %" PRIu64 " not found", key); | |
1649 | ret_code = LTTCOMM_CONSUMERD_CHANNEL_FAIL; | |
4a2eb0ca | 1650 | goto end_msg_sessiond; |
d88aee68 DG |
1651 | } |
1652 | ||
9ce5646a MD |
1653 | health_code_update(); |
1654 | ||
288bdb30 MD |
1655 | if (!len) { |
1656 | /* | |
1657 | * There is nothing to receive. We have simply | |
1658 | * checked whether the channel can be found. | |
1659 | */ | |
1660 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1661 | goto end_msg_sessiond; | |
1662 | } | |
1663 | ||
d88aee68 | 1664 | /* Tell session daemon we are ready to receive the metadata. */ |
0c759fc9 | 1665 | ret = consumer_send_status_msg(sock, LTTCOMM_CONSUMERD_SUCCESS); |
ffe60014 DG |
1666 | if (ret < 0) { |
1667 | /* Somehow, the session daemon is not responding anymore. */ | |
d88aee68 DG |
1668 | goto error_fatal; |
1669 | } | |
1670 | ||
9ce5646a MD |
1671 | health_code_update(); |
1672 | ||
d88aee68 | 1673 | /* Wait for more data. */ |
9ce5646a MD |
1674 | health_poll_entry(); |
1675 | ret = lttng_consumer_poll_socket(consumer_sockpoll); | |
1676 | health_poll_exit(); | |
84382d49 | 1677 | if (ret) { |
489f70e9 | 1678 | goto error_fatal; |
d88aee68 DG |
1679 | } |
1680 | ||
9ce5646a MD |
1681 | health_code_update(); |
1682 | ||
331744e3 | 1683 | ret = lttng_ustconsumer_recv_metadata(sock, key, offset, |
94d49140 | 1684 | len, channel, 0, 1); |
d88aee68 | 1685 | if (ret < 0) { |
331744e3 | 1686 | /* error receiving from sessiond */ |
489f70e9 | 1687 | goto error_fatal; |
331744e3 JD |
1688 | } else { |
1689 | ret_code = ret; | |
d88aee68 DG |
1690 | goto end_msg_sessiond; |
1691 | } | |
d88aee68 DG |
1692 | } |
1693 | case LTTNG_CONSUMER_SETUP_METADATA: | |
1694 | { | |
1695 | int ret; | |
1696 | ||
1697 | ret = setup_metadata(ctx, msg.u.setup_metadata.key); | |
1698 | if (ret) { | |
1699 | ret_code = ret; | |
1700 | } | |
1701 | goto end_msg_sessiond; | |
ffe60014 | 1702 | } |
6dc3064a DG |
1703 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
1704 | { | |
10a50311 JD |
1705 | if (msg.u.snapshot_channel.metadata) { |
1706 | ret = snapshot_metadata(msg.u.snapshot_channel.key, | |
1707 | msg.u.snapshot_channel.pathname, | |
1708 | msg.u.snapshot_channel.relayd_id, | |
1709 | ctx); | |
1710 | if (ret < 0) { | |
1711 | ERR("Snapshot metadata failed"); | |
e462382a | 1712 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; |
10a50311 JD |
1713 | } |
1714 | } else { | |
1715 | ret = snapshot_channel(msg.u.snapshot_channel.key, | |
1716 | msg.u.snapshot_channel.pathname, | |
1717 | msg.u.snapshot_channel.relayd_id, | |
d07ceecd | 1718 | msg.u.snapshot_channel.nb_packets_per_stream, |
10a50311 JD |
1719 | ctx); |
1720 | if (ret < 0) { | |
1721 | ERR("Snapshot channel failed"); | |
e462382a | 1722 | ret_code = LTTCOMM_CONSUMERD_CHANNEL_FAIL; |
10a50311 JD |
1723 | } |
1724 | } | |
1725 | ||
9ce5646a | 1726 | health_code_update(); |
6dc3064a DG |
1727 | ret = consumer_send_status_msg(sock, ret_code); |
1728 | if (ret < 0) { | |
1729 | /* Somehow, the session daemon is not responding anymore. */ | |
1730 | goto end_nosignal; | |
1731 | } | |
9ce5646a | 1732 | health_code_update(); |
6dc3064a DG |
1733 | break; |
1734 | } | |
3bd1e081 MD |
1735 | default: |
1736 | break; | |
1737 | } | |
3f8e211f | 1738 | |
3bd1e081 | 1739 | end_nosignal: |
b0b335c8 | 1740 | rcu_read_unlock(); |
4cbc1a04 | 1741 | |
9ce5646a MD |
1742 | health_code_update(); |
1743 | ||
4cbc1a04 DG |
1744 | /* |
1745 | * Return 1 to indicate success since the 0 value can be a socket | |
1746 | * shutdown during the recv() or send() call. | |
1747 | */ | |
1748 | return 1; | |
ffe60014 DG |
1749 | |
1750 | end_msg_sessiond: | |
1751 | /* | |
1752 | * The returned value here is not useful since either way we'll return 1 to | |
1753 | * the caller because the session daemon socket management is done | |
1754 | * elsewhere. Returning a negative code or 0 will shutdown the consumer. | |
1755 | */ | |
489f70e9 MD |
1756 | ret = consumer_send_status_msg(sock, ret_code); |
1757 | if (ret < 0) { | |
1758 | goto error_fatal; | |
1759 | } | |
ffe60014 | 1760 | rcu_read_unlock(); |
9ce5646a MD |
1761 | |
1762 | health_code_update(); | |
1763 | ||
ffe60014 DG |
1764 | return 1; |
1765 | end_channel_error: | |
1766 | if (channel) { | |
1767 | /* | |
1768 | * Free channel here since no one has a reference to it. We don't | |
1769 | * free after that because a stream can store this pointer. | |
1770 | */ | |
1771 | destroy_channel(channel); | |
1772 | } | |
1773 | /* We have to send a status channel message indicating an error. */ | |
1774 | ret = consumer_send_status_channel(sock, NULL); | |
1775 | if (ret < 0) { | |
1776 | /* Stop everything if session daemon can not be notified. */ | |
1777 | goto error_fatal; | |
1778 | } | |
1779 | rcu_read_unlock(); | |
9ce5646a MD |
1780 | |
1781 | health_code_update(); | |
1782 | ||
ffe60014 DG |
1783 | return 1; |
1784 | error_fatal: | |
1785 | rcu_read_unlock(); | |
1786 | /* This will issue a consumer stop. */ | |
1787 | return -1; | |
3bd1e081 MD |
1788 | } |
1789 | ||
ffe60014 DG |
1790 | /* |
1791 | * Wrapper over the mmap() read offset from ust-ctl library. Since this can be | |
1792 | * compiled out, we isolate it in this library. | |
1793 | */ | |
1794 | int lttng_ustctl_get_mmap_read_offset(struct lttng_consumer_stream *stream, | |
1795 | unsigned long *off) | |
3bd1e081 | 1796 | { |
ffe60014 DG |
1797 | assert(stream); |
1798 | assert(stream->ustream); | |
b5c5fc29 | 1799 | |
ffe60014 | 1800 | return ustctl_get_mmap_read_offset(stream->ustream, off); |
3bd1e081 MD |
1801 | } |
1802 | ||
ffe60014 DG |
1803 | /* |
1804 | * Wrapper over the mmap() read offset from ust-ctl library. Since this can be | |
1805 | * compiled out, we isolate it in this library. | |
1806 | */ | |
1807 | void *lttng_ustctl_get_mmap_base(struct lttng_consumer_stream *stream) | |
d056b477 | 1808 | { |
ffe60014 DG |
1809 | assert(stream); |
1810 | assert(stream->ustream); | |
1811 | ||
1812 | return ustctl_get_mmap_base(stream->ustream); | |
d056b477 MD |
1813 | } |
1814 | ||
ffe60014 DG |
1815 | /* |
1816 | * Take a snapshot for a specific fd | |
1817 | * | |
1818 | * Returns 0 on success, < 0 on error | |
1819 | */ | |
1820 | int lttng_ustconsumer_take_snapshot(struct lttng_consumer_stream *stream) | |
3bd1e081 | 1821 | { |
ffe60014 DG |
1822 | assert(stream); |
1823 | assert(stream->ustream); | |
1824 | ||
1825 | return ustctl_snapshot(stream->ustream); | |
3bd1e081 MD |
1826 | } |
1827 | ||
ffe60014 DG |
1828 | /* |
1829 | * Get the produced position | |
1830 | * | |
1831 | * Returns 0 on success, < 0 on error | |
1832 | */ | |
1833 | int lttng_ustconsumer_get_produced_snapshot( | |
1834 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
3bd1e081 | 1835 | { |
ffe60014 DG |
1836 | assert(stream); |
1837 | assert(stream->ustream); | |
1838 | assert(pos); | |
7a57cf92 | 1839 | |
ffe60014 DG |
1840 | return ustctl_snapshot_get_produced(stream->ustream, pos); |
1841 | } | |
7a57cf92 | 1842 | |
10a50311 JD |
1843 | /* |
1844 | * Get the consumed position | |
1845 | * | |
1846 | * Returns 0 on success, < 0 on error | |
1847 | */ | |
1848 | int lttng_ustconsumer_get_consumed_snapshot( | |
1849 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
1850 | { | |
1851 | assert(stream); | |
1852 | assert(stream->ustream); | |
1853 | assert(pos); | |
1854 | ||
1855 | return ustctl_snapshot_get_consumed(stream->ustream, pos); | |
1856 | } | |
1857 | ||
84a182ce DG |
1858 | void lttng_ustconsumer_flush_buffer(struct lttng_consumer_stream *stream, |
1859 | int producer) | |
1860 | { | |
1861 | assert(stream); | |
1862 | assert(stream->ustream); | |
1863 | ||
1864 | ustctl_flush_buffer(stream->ustream, producer); | |
1865 | } | |
1866 | ||
1867 | int lttng_ustconsumer_get_current_timestamp( | |
1868 | struct lttng_consumer_stream *stream, uint64_t *ts) | |
1869 | { | |
1870 | assert(stream); | |
1871 | assert(stream->ustream); | |
1872 | assert(ts); | |
1873 | ||
1874 | return ustctl_get_current_timestamp(stream->ustream, ts); | |
1875 | } | |
1876 | ||
ffe60014 | 1877 | /* |
f21fa4fd | 1878 | * Called when the stream signals the consumer that it has hung up. |
ffe60014 DG |
1879 | */ |
1880 | void lttng_ustconsumer_on_stream_hangup(struct lttng_consumer_stream *stream) | |
1881 | { | |
1882 | assert(stream); | |
1883 | assert(stream->ustream); | |
2c1dd183 | 1884 | |
f21fa4fd MD |
1885 | pthread_mutex_lock(&stream->lock); |
1886 | if (!stream->quiescent) { | |
1887 | ustctl_flush_buffer(stream->ustream, 0); | |
1888 | stream->quiescent = true; | |
1889 | } | |
1890 | pthread_mutex_unlock(&stream->lock); | |
ffe60014 DG |
1891 | stream->hangup_flush_done = 1; |
1892 | } | |
ee77a7b0 | 1893 | |
ffe60014 DG |
1894 | void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan) |
1895 | { | |
4628484a MD |
1896 | int i; |
1897 | ||
ffe60014 DG |
1898 | assert(chan); |
1899 | assert(chan->uchan); | |
e316aad5 | 1900 | |
ea88ca2a MD |
1901 | if (chan->switch_timer_enabled == 1) { |
1902 | consumer_timer_switch_stop(chan); | |
1903 | } | |
4628484a MD |
1904 | for (i = 0; i < chan->nr_stream_fds; i++) { |
1905 | int ret; | |
1906 | ||
1907 | ret = close(chan->stream_fds[i]); | |
1908 | if (ret) { | |
1909 | PERROR("close"); | |
1910 | } | |
1911 | if (chan->shm_path[0]) { | |
1912 | char shm_path[PATH_MAX]; | |
1913 | ||
1914 | ret = get_stream_shm_path(shm_path, chan->shm_path, i); | |
1915 | if (ret) { | |
1916 | ERR("Cannot get stream shm path"); | |
1917 | } | |
1918 | ret = run_as_unlink(shm_path, chan->uid, chan->gid); | |
1919 | if (ret) { | |
4628484a MD |
1920 | PERROR("unlink %s", shm_path); |
1921 | } | |
1922 | } | |
1923 | } | |
3bd1e081 MD |
1924 | } |
1925 | ||
11544fe5 MD |
1926 | void lttng_ustconsumer_free_channel(struct lttng_consumer_channel *chan) |
1927 | { | |
1928 | assert(chan); | |
1929 | assert(chan->uchan); | |
1930 | ||
1931 | consumer_metadata_cache_destroy(chan); | |
1932 | ustctl_destroy_channel(chan->uchan); | |
e349e5d4 JR |
1933 | /* Try to rmdir all directories under shm_path root. */ |
1934 | if (chan->root_shm_path[0]) { | |
1935 | (void) run_as_recursive_rmdir(chan->root_shm_path, | |
1936 | chan->uid, chan->gid); | |
1937 | } | |
11544fe5 MD |
1938 | free(chan->stream_fds); |
1939 | } | |
1940 | ||
3bd1e081 MD |
1941 | void lttng_ustconsumer_del_stream(struct lttng_consumer_stream *stream) |
1942 | { | |
ffe60014 DG |
1943 | assert(stream); |
1944 | assert(stream->ustream); | |
d41f73b7 | 1945 | |
ea88ca2a MD |
1946 | if (stream->chan->switch_timer_enabled == 1) { |
1947 | consumer_timer_switch_stop(stream->chan); | |
1948 | } | |
ffe60014 DG |
1949 | ustctl_destroy_stream(stream->ustream); |
1950 | } | |
d41f73b7 | 1951 | |
6d574024 DG |
1952 | int lttng_ustconsumer_get_wakeup_fd(struct lttng_consumer_stream *stream) |
1953 | { | |
1954 | assert(stream); | |
1955 | assert(stream->ustream); | |
1956 | ||
1957 | return ustctl_stream_get_wakeup_fd(stream->ustream); | |
1958 | } | |
1959 | ||
1960 | int lttng_ustconsumer_close_wakeup_fd(struct lttng_consumer_stream *stream) | |
1961 | { | |
1962 | assert(stream); | |
1963 | assert(stream->ustream); | |
1964 | ||
1965 | return ustctl_stream_close_wakeup_fd(stream->ustream); | |
1966 | } | |
1967 | ||
309167d2 JD |
1968 | /* |
1969 | * Populate index values of a UST stream. Values are set in big endian order. | |
1970 | * | |
1971 | * Return 0 on success or else a negative value. | |
1972 | */ | |
50adc264 | 1973 | static int get_index_values(struct ctf_packet_index *index, |
309167d2 JD |
1974 | struct ustctl_consumer_stream *ustream) |
1975 | { | |
1976 | int ret; | |
1977 | ||
1978 | ret = ustctl_get_timestamp_begin(ustream, &index->timestamp_begin); | |
1979 | if (ret < 0) { | |
1980 | PERROR("ustctl_get_timestamp_begin"); | |
1981 | goto error; | |
1982 | } | |
1983 | index->timestamp_begin = htobe64(index->timestamp_begin); | |
1984 | ||
1985 | ret = ustctl_get_timestamp_end(ustream, &index->timestamp_end); | |
1986 | if (ret < 0) { | |
1987 | PERROR("ustctl_get_timestamp_end"); | |
1988 | goto error; | |
1989 | } | |
1990 | index->timestamp_end = htobe64(index->timestamp_end); | |
1991 | ||
1992 | ret = ustctl_get_events_discarded(ustream, &index->events_discarded); | |
1993 | if (ret < 0) { | |
1994 | PERROR("ustctl_get_events_discarded"); | |
1995 | goto error; | |
1996 | } | |
1997 | index->events_discarded = htobe64(index->events_discarded); | |
1998 | ||
1999 | ret = ustctl_get_content_size(ustream, &index->content_size); | |
2000 | if (ret < 0) { | |
2001 | PERROR("ustctl_get_content_size"); | |
2002 | goto error; | |
2003 | } | |
2004 | index->content_size = htobe64(index->content_size); | |
2005 | ||
2006 | ret = ustctl_get_packet_size(ustream, &index->packet_size); | |
2007 | if (ret < 0) { | |
2008 | PERROR("ustctl_get_packet_size"); | |
2009 | goto error; | |
2010 | } | |
2011 | index->packet_size = htobe64(index->packet_size); | |
2012 | ||
2013 | ret = ustctl_get_stream_id(ustream, &index->stream_id); | |
2014 | if (ret < 0) { | |
2015 | PERROR("ustctl_get_stream_id"); | |
2016 | goto error; | |
2017 | } | |
2018 | index->stream_id = htobe64(index->stream_id); | |
2019 | ||
2020 | error: | |
2021 | return ret; | |
2022 | } | |
2023 | ||
94d49140 JD |
2024 | /* |
2025 | * Write up to one packet from the metadata cache to the channel. | |
2026 | * | |
2027 | * Returns the number of bytes pushed in the cache, or a negative value | |
2028 | * on error. | |
2029 | */ | |
2030 | static | |
2031 | int commit_one_metadata_packet(struct lttng_consumer_stream *stream) | |
2032 | { | |
2033 | ssize_t write_len; | |
2034 | int ret; | |
2035 | ||
2036 | pthread_mutex_lock(&stream->chan->metadata_cache->lock); | |
288bdb30 | 2037 | if (stream->chan->metadata_cache->max_offset |
94d49140 JD |
2038 | == stream->ust_metadata_pushed) { |
2039 | ret = 0; | |
2040 | goto end; | |
2041 | } | |
2042 | ||
2043 | write_len = ustctl_write_one_packet_to_channel(stream->chan->uchan, | |
2044 | &stream->chan->metadata_cache->data[stream->ust_metadata_pushed], | |
288bdb30 | 2045 | stream->chan->metadata_cache->max_offset |
94d49140 JD |
2046 | - stream->ust_metadata_pushed); |
2047 | assert(write_len != 0); | |
2048 | if (write_len < 0) { | |
2049 | ERR("Writing one metadata packet"); | |
2050 | ret = -1; | |
2051 | goto end; | |
2052 | } | |
2053 | stream->ust_metadata_pushed += write_len; | |
2054 | ||
288bdb30 | 2055 | assert(stream->chan->metadata_cache->max_offset >= |
94d49140 JD |
2056 | stream->ust_metadata_pushed); |
2057 | ret = write_len; | |
2058 | ||
2059 | end: | |
2060 | pthread_mutex_unlock(&stream->chan->metadata_cache->lock); | |
2061 | return ret; | |
2062 | } | |
2063 | ||
309167d2 | 2064 | |
94d49140 JD |
2065 | /* |
2066 | * Sync metadata meaning request them to the session daemon and snapshot to the | |
2067 | * metadata thread can consumer them. | |
2068 | * | |
288bdb30 MD |
2069 | * Metadata stream lock is held here, but we need to release it when |
2070 | * interacting with sessiond, else we cause a deadlock with live | |
2071 | * awaiting on metadata to be pushed out. | |
94d49140 JD |
2072 | * |
2073 | * Return 0 if new metadatda is available, EAGAIN if the metadata stream | |
2074 | * is empty or a negative value on error. | |
2075 | */ | |
2076 | int lttng_ustconsumer_sync_metadata(struct lttng_consumer_local_data *ctx, | |
2077 | struct lttng_consumer_stream *metadata) | |
2078 | { | |
2079 | int ret; | |
2080 | int retry = 0; | |
2081 | ||
2082 | assert(ctx); | |
2083 | assert(metadata); | |
2084 | ||
288bdb30 | 2085 | pthread_mutex_unlock(&metadata->lock); |
94d49140 JD |
2086 | /* |
2087 | * Request metadata from the sessiond, but don't wait for the flush | |
2088 | * because we locked the metadata thread. | |
2089 | */ | |
2090 | ret = lttng_ustconsumer_request_metadata(ctx, metadata->chan, 0, 0); | |
2091 | if (ret < 0) { | |
2092 | goto end; | |
2093 | } | |
288bdb30 | 2094 | pthread_mutex_lock(&metadata->lock); |
94d49140 JD |
2095 | |
2096 | ret = commit_one_metadata_packet(metadata); | |
2097 | if (ret <= 0) { | |
2098 | goto end; | |
2099 | } else if (ret > 0) { | |
2100 | retry = 1; | |
2101 | } | |
2102 | ||
2103 | ustctl_flush_buffer(metadata->ustream, 1); | |
2104 | ret = ustctl_snapshot(metadata->ustream); | |
2105 | if (ret < 0) { | |
2106 | if (errno != EAGAIN) { | |
2107 | ERR("Sync metadata, taking UST snapshot"); | |
2108 | goto end; | |
2109 | } | |
2110 | DBG("No new metadata when syncing them."); | |
2111 | /* No new metadata, exit. */ | |
2112 | ret = ENODATA; | |
2113 | goto end; | |
2114 | } | |
2115 | ||
2116 | /* | |
2117 | * After this flush, we still need to extract metadata. | |
2118 | */ | |
2119 | if (retry) { | |
2120 | ret = EAGAIN; | |
2121 | } | |
2122 | ||
2123 | end: | |
2124 | return ret; | |
2125 | } | |
2126 | ||
02b3d176 DG |
2127 | /* |
2128 | * Return 0 on success else a negative value. | |
2129 | */ | |
2130 | static int notify_if_more_data(struct lttng_consumer_stream *stream, | |
2131 | struct lttng_consumer_local_data *ctx) | |
2132 | { | |
2133 | int ret; | |
2134 | struct ustctl_consumer_stream *ustream; | |
2135 | ||
2136 | assert(stream); | |
2137 | assert(ctx); | |
2138 | ||
2139 | ustream = stream->ustream; | |
2140 | ||
2141 | /* | |
2142 | * First, we are going to check if there is a new subbuffer available | |
2143 | * before reading the stream wait_fd. | |
2144 | */ | |
2145 | /* Get the next subbuffer */ | |
2146 | ret = ustctl_get_next_subbuf(ustream); | |
2147 | if (ret) { | |
2148 | /* No more data found, flag the stream. */ | |
2149 | stream->has_data = 0; | |
2150 | ret = 0; | |
2151 | goto end; | |
2152 | } | |
2153 | ||
5420e5db | 2154 | ret = ustctl_put_subbuf(ustream); |
02b3d176 DG |
2155 | assert(!ret); |
2156 | ||
2157 | /* This stream still has data. Flag it and wake up the data thread. */ | |
2158 | stream->has_data = 1; | |
2159 | ||
2160 | if (stream->monitor && !stream->hangup_flush_done && !ctx->has_wakeup) { | |
2161 | ssize_t writelen; | |
2162 | ||
2163 | writelen = lttng_pipe_write(ctx->consumer_wakeup_pipe, "!", 1); | |
2164 | if (writelen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) { | |
2165 | ret = writelen; | |
2166 | goto end; | |
2167 | } | |
2168 | ||
2169 | /* The wake up pipe has been notified. */ | |
2170 | ctx->has_wakeup = 1; | |
2171 | } | |
2172 | ret = 0; | |
2173 | ||
2174 | end: | |
2175 | return ret; | |
2176 | } | |
2177 | ||
94d49140 JD |
2178 | /* |
2179 | * Read subbuffer from the given stream. | |
2180 | * | |
2181 | * Stream lock MUST be acquired. | |
2182 | * | |
2183 | * Return 0 on success else a negative value. | |
2184 | */ | |
d41f73b7 MD |
2185 | int lttng_ustconsumer_read_subbuffer(struct lttng_consumer_stream *stream, |
2186 | struct lttng_consumer_local_data *ctx) | |
2187 | { | |
1d4dfdef | 2188 | unsigned long len, subbuf_size, padding; |
1c20f0e2 | 2189 | int err, write_index = 1; |
d41f73b7 | 2190 | long ret = 0; |
ffe60014 | 2191 | struct ustctl_consumer_stream *ustream; |
50adc264 | 2192 | struct ctf_packet_index index; |
ffe60014 DG |
2193 | |
2194 | assert(stream); | |
2195 | assert(stream->ustream); | |
2196 | assert(ctx); | |
d41f73b7 | 2197 | |
3eb914c0 | 2198 | DBG("In UST read_subbuffer (wait_fd: %d, name: %s)", stream->wait_fd, |
ffe60014 DG |
2199 | stream->name); |
2200 | ||
2201 | /* Ease our life for what's next. */ | |
2202 | ustream = stream->ustream; | |
d41f73b7 | 2203 | |
6cd525e8 | 2204 | /* |
02b3d176 DG |
2205 | * We can consume the 1 byte written into the wait_fd by UST. Don't trigger |
2206 | * error if we cannot read this one byte (read returns 0), or if the error | |
2207 | * is EAGAIN or EWOULDBLOCK. | |
2208 | * | |
2209 | * This is only done when the stream is monitored by a thread, before the | |
2210 | * flush is done after a hangup and if the stream is not flagged with data | |
2211 | * since there might be nothing to consume in the wait fd but still have | |
2212 | * data available flagged by the consumer wake up pipe. | |
6cd525e8 | 2213 | */ |
02b3d176 DG |
2214 | if (stream->monitor && !stream->hangup_flush_done && !stream->has_data) { |
2215 | char dummy; | |
c617c0c6 MD |
2216 | ssize_t readlen; |
2217 | ||
6cd525e8 MD |
2218 | readlen = lttng_read(stream->wait_fd, &dummy, 1); |
2219 | if (readlen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) { | |
effcf122 MD |
2220 | ret = readlen; |
2221 | goto end; | |
2222 | } | |
d41f73b7 MD |
2223 | } |
2224 | ||
04ef1097 | 2225 | retry: |
d41f73b7 | 2226 | /* Get the next subbuffer */ |
ffe60014 | 2227 | err = ustctl_get_next_subbuf(ustream); |
d41f73b7 | 2228 | if (err != 0) { |
04ef1097 MD |
2229 | /* |
2230 | * Populate metadata info if the existing info has | |
2231 | * already been read. | |
2232 | */ | |
2233 | if (stream->metadata_flag) { | |
94d49140 JD |
2234 | ret = commit_one_metadata_packet(stream); |
2235 | if (ret <= 0) { | |
04ef1097 MD |
2236 | goto end; |
2237 | } | |
04ef1097 MD |
2238 | ustctl_flush_buffer(stream->ustream, 1); |
2239 | goto retry; | |
2240 | } | |
2241 | ||
1d4dfdef | 2242 | ret = err; /* ustctl_get_next_subbuf returns negative, caller expect positive. */ |
d41f73b7 MD |
2243 | /* |
2244 | * This is a debug message even for single-threaded consumer, | |
2245 | * because poll() have more relaxed criterions than get subbuf, | |
2246 | * so get_subbuf may fail for short race windows where poll() | |
2247 | * would issue wakeups. | |
2248 | */ | |
2249 | DBG("Reserving sub buffer failed (everything is normal, " | |
ffe60014 | 2250 | "it is due to concurrency) [ret: %d]", err); |
d41f73b7 MD |
2251 | goto end; |
2252 | } | |
ffe60014 | 2253 | assert(stream->chan->output == CONSUMER_CHANNEL_MMAP); |
309167d2 | 2254 | |
1c20f0e2 | 2255 | if (!stream->metadata_flag) { |
309167d2 JD |
2256 | index.offset = htobe64(stream->out_fd_offset); |
2257 | ret = get_index_values(&index, ustream); | |
2258 | if (ret < 0) { | |
2259 | goto end; | |
2260 | } | |
1c20f0e2 JD |
2261 | } else { |
2262 | write_index = 0; | |
309167d2 JD |
2263 | } |
2264 | ||
1d4dfdef | 2265 | /* Get the full padded subbuffer size */ |
ffe60014 | 2266 | err = ustctl_get_padded_subbuf_size(ustream, &len); |
effcf122 | 2267 | assert(err == 0); |
1d4dfdef DG |
2268 | |
2269 | /* Get subbuffer data size (without padding) */ | |
ffe60014 | 2270 | err = ustctl_get_subbuf_size(ustream, &subbuf_size); |
1d4dfdef DG |
2271 | assert(err == 0); |
2272 | ||
2273 | /* Make sure we don't get a subbuffer size bigger than the padded */ | |
2274 | assert(len >= subbuf_size); | |
2275 | ||
2276 | padding = len - subbuf_size; | |
d41f73b7 | 2277 | /* write the subbuffer to the tracefile */ |
309167d2 | 2278 | ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, padding, &index); |
91dfef6e DG |
2279 | /* |
2280 | * The mmap operation should write subbuf_size amount of data when network | |
2281 | * streaming or the full padding (len) size when we are _not_ streaming. | |
2282 | */ | |
d88aee68 DG |
2283 | if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) || |
2284 | (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) { | |
d41f73b7 | 2285 | /* |
91dfef6e | 2286 | * Display the error but continue processing to try to release the |
c5c45efa DG |
2287 | * subbuffer. This is a DBG statement since any unexpected kill or |
2288 | * signal, the application gets unregistered, relayd gets closed or | |
2289 | * anything that affects the buffer lifetime will trigger this error. | |
2290 | * So, for the sake of the user, don't print this error since it can | |
2291 | * happen and it is OK with the code flow. | |
d41f73b7 | 2292 | */ |
c5c45efa | 2293 | DBG("Error writing to tracefile " |
8fd623e0 | 2294 | "(ret: %ld != len: %lu != subbuf_size: %lu)", |
91dfef6e | 2295 | ret, len, subbuf_size); |
309167d2 | 2296 | write_index = 0; |
d41f73b7 | 2297 | } |
ffe60014 | 2298 | err = ustctl_put_next_subbuf(ustream); |
effcf122 | 2299 | assert(err == 0); |
331744e3 | 2300 | |
02b3d176 DG |
2301 | /* |
2302 | * This will consumer the byte on the wait_fd if and only if there is not | |
2303 | * next subbuffer to be acquired. | |
2304 | */ | |
2305 | if (!stream->metadata_flag) { | |
2306 | ret = notify_if_more_data(stream, ctx); | |
2307 | if (ret < 0) { | |
2308 | goto end; | |
2309 | } | |
2310 | } | |
2311 | ||
309167d2 | 2312 | /* Write index if needed. */ |
1c20f0e2 JD |
2313 | if (!write_index) { |
2314 | goto end; | |
2315 | } | |
2316 | ||
94d49140 JD |
2317 | if (stream->chan->live_timer_interval && !stream->metadata_flag) { |
2318 | /* | |
2319 | * In live, block until all the metadata is sent. | |
2320 | */ | |
288bdb30 MD |
2321 | pthread_mutex_lock(&stream->metadata_timer_lock); |
2322 | assert(!stream->missed_metadata_flush); | |
2323 | stream->waiting_on_metadata = true; | |
2324 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
2325 | ||
94d49140 | 2326 | err = consumer_stream_sync_metadata(ctx, stream->session_id); |
288bdb30 MD |
2327 | |
2328 | pthread_mutex_lock(&stream->metadata_timer_lock); | |
2329 | stream->waiting_on_metadata = false; | |
2330 | if (stream->missed_metadata_flush) { | |
2331 | stream->missed_metadata_flush = false; | |
2332 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
2333 | (void) consumer_flush_ust_index(stream); | |
2334 | } else { | |
2335 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
2336 | } | |
2337 | ||
94d49140 JD |
2338 | if (err < 0) { |
2339 | goto end; | |
2340 | } | |
2341 | } | |
2342 | ||
1c20f0e2 JD |
2343 | assert(!stream->metadata_flag); |
2344 | err = consumer_stream_write_index(stream, &index); | |
2345 | if (err < 0) { | |
2346 | goto end; | |
309167d2 JD |
2347 | } |
2348 | ||
d41f73b7 MD |
2349 | end: |
2350 | return ret; | |
2351 | } | |
2352 | ||
ffe60014 DG |
2353 | /* |
2354 | * Called when a stream is created. | |
fe4477ee JD |
2355 | * |
2356 | * Return 0 on success or else a negative value. | |
ffe60014 | 2357 | */ |
d41f73b7 MD |
2358 | int lttng_ustconsumer_on_recv_stream(struct lttng_consumer_stream *stream) |
2359 | { | |
fe4477ee JD |
2360 | int ret; |
2361 | ||
10a50311 JD |
2362 | assert(stream); |
2363 | ||
fe4477ee | 2364 | /* Don't create anything if this is set for streaming. */ |
10a50311 | 2365 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor) { |
fe4477ee JD |
2366 | ret = utils_create_stream_file(stream->chan->pathname, stream->name, |
2367 | stream->chan->tracefile_size, stream->tracefile_count_current, | |
309167d2 | 2368 | stream->uid, stream->gid, NULL); |
fe4477ee JD |
2369 | if (ret < 0) { |
2370 | goto error; | |
2371 | } | |
2372 | stream->out_fd = ret; | |
2373 | stream->tracefile_size_current = 0; | |
309167d2 JD |
2374 | |
2375 | if (!stream->metadata_flag) { | |
2376 | ret = index_create_file(stream->chan->pathname, | |
2377 | stream->name, stream->uid, stream->gid, | |
2378 | stream->chan->tracefile_size, | |
2379 | stream->tracefile_count_current); | |
2380 | if (ret < 0) { | |
2381 | goto error; | |
2382 | } | |
2383 | stream->index_fd = ret; | |
2384 | } | |
fe4477ee JD |
2385 | } |
2386 | ret = 0; | |
2387 | ||
2388 | error: | |
2389 | return ret; | |
d41f73b7 | 2390 | } |
ca22feea DG |
2391 | |
2392 | /* | |
2393 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
2394 | * stream. Consumer data lock MUST be acquired before calling this function |
2395 | * and the stream lock. | |
ca22feea | 2396 | * |
6d805429 | 2397 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
2398 | * data is available for trace viewer reading. |
2399 | */ | |
6d805429 | 2400 | int lttng_ustconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
2401 | { |
2402 | int ret; | |
2403 | ||
2404 | assert(stream); | |
ffe60014 | 2405 | assert(stream->ustream); |
ca22feea | 2406 | |
6d805429 | 2407 | DBG("UST consumer checking data pending"); |
c8f59ee5 | 2408 | |
ca6b395f MD |
2409 | if (stream->endpoint_status != CONSUMER_ENDPOINT_ACTIVE) { |
2410 | ret = 0; | |
2411 | goto end; | |
2412 | } | |
2413 | ||
04ef1097 | 2414 | if (stream->chan->type == CONSUMER_CHANNEL_TYPE_METADATA) { |
e6ee4eab DG |
2415 | uint64_t contiguous, pushed; |
2416 | ||
2417 | /* Ease our life a bit. */ | |
288bdb30 | 2418 | contiguous = stream->chan->metadata_cache->max_offset; |
e6ee4eab DG |
2419 | pushed = stream->ust_metadata_pushed; |
2420 | ||
04ef1097 MD |
2421 | /* |
2422 | * We can simply check whether all contiguously available data | |
2423 | * has been pushed to the ring buffer, since the push operation | |
2424 | * is performed within get_next_subbuf(), and because both | |
2425 | * get_next_subbuf() and put_next_subbuf() are issued atomically | |
2426 | * thanks to the stream lock within | |
2427 | * lttng_ustconsumer_read_subbuffer(). This basically means that | |
2428 | * whetnever ust_metadata_pushed is incremented, the associated | |
2429 | * metadata has been consumed from the metadata stream. | |
2430 | */ | |
2431 | DBG("UST consumer metadata pending check: contiguous %" PRIu64 " vs pushed %" PRIu64, | |
e6ee4eab | 2432 | contiguous, pushed); |
aa01b94c | 2433 | assert(((int64_t) (contiguous - pushed)) >= 0); |
e6ee4eab | 2434 | if ((contiguous != pushed) || |
6acdf328 | 2435 | (((int64_t) contiguous - pushed) > 0 || contiguous == 0)) { |
04ef1097 MD |
2436 | ret = 1; /* Data is pending */ |
2437 | goto end; | |
2438 | } | |
2439 | } else { | |
2440 | ret = ustctl_get_next_subbuf(stream->ustream); | |
2441 | if (ret == 0) { | |
2442 | /* | |
2443 | * There is still data so let's put back this | |
2444 | * subbuffer. | |
2445 | */ | |
2446 | ret = ustctl_put_subbuf(stream->ustream); | |
2447 | assert(ret == 0); | |
2448 | ret = 1; /* Data is pending */ | |
2449 | goto end; | |
2450 | } | |
ca22feea DG |
2451 | } |
2452 | ||
6d805429 DG |
2453 | /* Data is NOT pending so ready to be read. */ |
2454 | ret = 0; | |
ca22feea | 2455 | |
6efae65e DG |
2456 | end: |
2457 | return ret; | |
ca22feea | 2458 | } |
d88aee68 | 2459 | |
6d574024 DG |
2460 | /* |
2461 | * Stop a given metadata channel timer if enabled and close the wait fd which | |
2462 | * is the poll pipe of the metadata stream. | |
2463 | * | |
2464 | * This MUST be called with the metadata channel acquired. | |
2465 | */ | |
2466 | void lttng_ustconsumer_close_metadata(struct lttng_consumer_channel *metadata) | |
2467 | { | |
2468 | int ret; | |
2469 | ||
2470 | assert(metadata); | |
2471 | assert(metadata->type == CONSUMER_CHANNEL_TYPE_METADATA); | |
2472 | ||
2473 | DBG("Closing metadata channel key %" PRIu64, metadata->key); | |
2474 | ||
2475 | if (metadata->switch_timer_enabled == 1) { | |
2476 | consumer_timer_switch_stop(metadata); | |
2477 | } | |
2478 | ||
2479 | if (!metadata->metadata_stream) { | |
2480 | goto end; | |
2481 | } | |
2482 | ||
2483 | /* | |
2484 | * Closing write side so the thread monitoring the stream wakes up if any | |
2485 | * and clean the metadata stream. | |
2486 | */ | |
2487 | if (metadata->metadata_stream->ust_metadata_poll_pipe[1] >= 0) { | |
2488 | ret = close(metadata->metadata_stream->ust_metadata_poll_pipe[1]); | |
2489 | if (ret < 0) { | |
2490 | PERROR("closing metadata pipe write side"); | |
2491 | } | |
2492 | metadata->metadata_stream->ust_metadata_poll_pipe[1] = -1; | |
2493 | } | |
2494 | ||
2495 | end: | |
2496 | return; | |
2497 | } | |
2498 | ||
d88aee68 DG |
2499 | /* |
2500 | * Close every metadata stream wait fd of the metadata hash table. This | |
2501 | * function MUST be used very carefully so not to run into a race between the | |
2502 | * metadata thread handling streams and this function closing their wait fd. | |
2503 | * | |
2504 | * For UST, this is used when the session daemon hangs up. Its the metadata | |
2505 | * producer so calling this is safe because we are assured that no state change | |
2506 | * can occur in the metadata thread for the streams in the hash table. | |
2507 | */ | |
6d574024 | 2508 | void lttng_ustconsumer_close_all_metadata(struct lttng_ht *metadata_ht) |
d88aee68 | 2509 | { |
d88aee68 DG |
2510 | struct lttng_ht_iter iter; |
2511 | struct lttng_consumer_stream *stream; | |
2512 | ||
2513 | assert(metadata_ht); | |
2514 | assert(metadata_ht->ht); | |
2515 | ||
2516 | DBG("UST consumer closing all metadata streams"); | |
2517 | ||
2518 | rcu_read_lock(); | |
2519 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, | |
2520 | node.node) { | |
9ce5646a MD |
2521 | |
2522 | health_code_update(); | |
2523 | ||
be2b50c7 | 2524 | pthread_mutex_lock(&stream->chan->lock); |
6d574024 | 2525 | lttng_ustconsumer_close_metadata(stream->chan); |
be2b50c7 DG |
2526 | pthread_mutex_unlock(&stream->chan->lock); |
2527 | ||
d88aee68 DG |
2528 | } |
2529 | rcu_read_unlock(); | |
2530 | } | |
d8ef542d MD |
2531 | |
2532 | void lttng_ustconsumer_close_stream_wakeup(struct lttng_consumer_stream *stream) | |
2533 | { | |
2534 | int ret; | |
2535 | ||
2536 | ret = ustctl_stream_close_wakeup_fd(stream->ustream); | |
2537 | if (ret < 0) { | |
2538 | ERR("Unable to close wakeup fd"); | |
2539 | } | |
2540 | } | |
331744e3 | 2541 | |
f666ae70 MD |
2542 | /* |
2543 | * Please refer to consumer-timer.c before adding any lock within this | |
2544 | * function or any of its callees. Timers have a very strict locking | |
2545 | * semantic with respect to teardown. Failure to respect this semantic | |
2546 | * introduces deadlocks. | |
288bdb30 MD |
2547 | * |
2548 | * DON'T hold the metadata lock when calling this function, else this | |
2549 | * can cause deadlock involving consumer awaiting for metadata to be | |
2550 | * pushed out due to concurrent interaction with the session daemon. | |
f666ae70 | 2551 | */ |
331744e3 | 2552 | int lttng_ustconsumer_request_metadata(struct lttng_consumer_local_data *ctx, |
94d49140 | 2553 | struct lttng_consumer_channel *channel, int timer, int wait) |
331744e3 JD |
2554 | { |
2555 | struct lttcomm_metadata_request_msg request; | |
2556 | struct lttcomm_consumer_msg msg; | |
0c759fc9 | 2557 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
331744e3 JD |
2558 | uint64_t len, key, offset; |
2559 | int ret; | |
2560 | ||
2561 | assert(channel); | |
2562 | assert(channel->metadata_cache); | |
2563 | ||
53efb85a MD |
2564 | memset(&request, 0, sizeof(request)); |
2565 | ||
331744e3 JD |
2566 | /* send the metadata request to sessiond */ |
2567 | switch (consumer_data.type) { | |
2568 | case LTTNG_CONSUMER64_UST: | |
2569 | request.bits_per_long = 64; | |
2570 | break; | |
2571 | case LTTNG_CONSUMER32_UST: | |
2572 | request.bits_per_long = 32; | |
2573 | break; | |
2574 | default: | |
2575 | request.bits_per_long = 0; | |
2576 | break; | |
2577 | } | |
2578 | ||
2579 | request.session_id = channel->session_id; | |
1950109e | 2580 | request.session_id_per_pid = channel->session_id_per_pid; |
567eb353 DG |
2581 | /* |
2582 | * Request the application UID here so the metadata of that application can | |
2583 | * be sent back. The channel UID corresponds to the user UID of the session | |
2584 | * used for the rights on the stream file(s). | |
2585 | */ | |
2586 | request.uid = channel->ust_app_uid; | |
331744e3 | 2587 | request.key = channel->key; |
567eb353 | 2588 | |
1950109e | 2589 | DBG("Sending metadata request to sessiond, session id %" PRIu64 |
567eb353 DG |
2590 | ", per-pid %" PRIu64 ", app UID %u and channek key %" PRIu64, |
2591 | request.session_id, request.session_id_per_pid, request.uid, | |
2592 | request.key); | |
331744e3 | 2593 | |
75d83e50 | 2594 | pthread_mutex_lock(&ctx->metadata_socket_lock); |
9ce5646a MD |
2595 | |
2596 | health_code_update(); | |
2597 | ||
331744e3 JD |
2598 | ret = lttcomm_send_unix_sock(ctx->consumer_metadata_socket, &request, |
2599 | sizeof(request)); | |
2600 | if (ret < 0) { | |
2601 | ERR("Asking metadata to sessiond"); | |
2602 | goto end; | |
2603 | } | |
2604 | ||
9ce5646a MD |
2605 | health_code_update(); |
2606 | ||
331744e3 JD |
2607 | /* Receive the metadata from sessiond */ |
2608 | ret = lttcomm_recv_unix_sock(ctx->consumer_metadata_socket, &msg, | |
2609 | sizeof(msg)); | |
2610 | if (ret != sizeof(msg)) { | |
8fd623e0 | 2611 | DBG("Consumer received unexpected message size %d (expects %zu)", |
331744e3 JD |
2612 | ret, sizeof(msg)); |
2613 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); | |
2614 | /* | |
2615 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
2616 | * since the caller handles this. | |
2617 | */ | |
2618 | goto end; | |
2619 | } | |
2620 | ||
9ce5646a MD |
2621 | health_code_update(); |
2622 | ||
331744e3 JD |
2623 | if (msg.cmd_type == LTTNG_ERR_UND) { |
2624 | /* No registry found */ | |
2625 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, | |
2626 | ret_code); | |
2627 | ret = 0; | |
2628 | goto end; | |
2629 | } else if (msg.cmd_type != LTTNG_CONSUMER_PUSH_METADATA) { | |
2630 | ERR("Unexpected cmd_type received %d", msg.cmd_type); | |
2631 | ret = -1; | |
2632 | goto end; | |
2633 | } | |
2634 | ||
2635 | len = msg.u.push_metadata.len; | |
2636 | key = msg.u.push_metadata.key; | |
2637 | offset = msg.u.push_metadata.target_offset; | |
2638 | ||
2639 | assert(key == channel->key); | |
2640 | if (len == 0) { | |
2641 | DBG("No new metadata to receive for key %" PRIu64, key); | |
2642 | } | |
2643 | ||
9ce5646a MD |
2644 | health_code_update(); |
2645 | ||
331744e3 JD |
2646 | /* Tell session daemon we are ready to receive the metadata. */ |
2647 | ret = consumer_send_status_msg(ctx->consumer_metadata_socket, | |
0c759fc9 | 2648 | LTTCOMM_CONSUMERD_SUCCESS); |
331744e3 JD |
2649 | if (ret < 0 || len == 0) { |
2650 | /* | |
2651 | * Somehow, the session daemon is not responding anymore or there is | |
2652 | * nothing to receive. | |
2653 | */ | |
2654 | goto end; | |
2655 | } | |
2656 | ||
9ce5646a MD |
2657 | health_code_update(); |
2658 | ||
1eb682be | 2659 | ret = lttng_ustconsumer_recv_metadata(ctx->consumer_metadata_socket, |
94d49140 | 2660 | key, offset, len, channel, timer, wait); |
1eb682be | 2661 | if (ret >= 0) { |
f2a444f1 DG |
2662 | /* |
2663 | * Only send the status msg if the sessiond is alive meaning a positive | |
2664 | * ret code. | |
2665 | */ | |
1eb682be | 2666 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, ret); |
f2a444f1 | 2667 | } |
331744e3 JD |
2668 | ret = 0; |
2669 | ||
2670 | end: | |
9ce5646a MD |
2671 | health_code_update(); |
2672 | ||
75d83e50 | 2673 | pthread_mutex_unlock(&ctx->metadata_socket_lock); |
331744e3 JD |
2674 | return ret; |
2675 | } | |
70190e1c DG |
2676 | |
2677 | /* | |
2678 | * Return the ustctl call for the get stream id. | |
2679 | */ | |
2680 | int lttng_ustconsumer_get_stream_id(struct lttng_consumer_stream *stream, | |
2681 | uint64_t *stream_id) | |
2682 | { | |
2683 | assert(stream); | |
2684 | assert(stream_id); | |
2685 | ||
2686 | return ustctl_get_stream_id(stream->ustream, stream_id); | |
2687 | } |