Commit | Line | Data |
---|---|---|
3bd1e081 MD |
1 | /* |
2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> | |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
b3530820 | 4 | * Copyright (C) 2017 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
3bd1e081 | 5 | * |
d14d33bf AM |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License, version 2 only, | |
8 | * as published by the Free Software Foundation. | |
3bd1e081 MD |
9 | * |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
d14d33bf AM |
15 | * You should have received a copy of the GNU General Public License along |
16 | * with this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
3bd1e081 MD |
18 | */ |
19 | ||
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> |
02d02e31 | 35 | #include <stdbool.h> |
0857097f | 36 | |
51a9e1c7 | 37 | #include <bin/lttng-consumerd/health-consumerd.h> |
990570ed | 38 | #include <common/common.h> |
10a8a223 | 39 | #include <common/sessiond-comm/sessiond-comm.h> |
00e2e675 | 40 | #include <common/relayd/relayd.h> |
dbb5dfe6 | 41 | #include <common/compat/fcntl.h> |
f263b7fd | 42 | #include <common/compat/endian.h> |
c8fea79c JR |
43 | #include <common/consumer/consumer-metadata-cache.h> |
44 | #include <common/consumer/consumer-stream.h> | |
45 | #include <common/consumer/consumer-timer.h> | |
fe4477ee | 46 | #include <common/utils.h> |
309167d2 | 47 | #include <common/index/index.h> |
10a8a223 DG |
48 | |
49 | #include "ust-consumer.h" | |
3bd1e081 | 50 | |
45863397 | 51 | #define INT_MAX_STR_LEN 12 /* includes \0 */ |
4628484a | 52 | |
3bd1e081 MD |
53 | extern struct lttng_consumer_global_data consumer_data; |
54 | extern int consumer_poll_timeout; | |
3bd1e081 MD |
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); | |
e5148e25 | 76 | lttng_trace_chunk_put(stream->trace_chunk); |
ffe60014 DG |
77 | free(stream); |
78 | } | |
79 | ||
80 | /* | |
81 | * If a channel is available meaning that was created before the streams | |
82 | * were, delete it. | |
83 | */ | |
84 | if (channel->uchan) { | |
85 | lttng_ustconsumer_del_channel(channel); | |
b83e03c4 | 86 | lttng_ustconsumer_free_channel(channel); |
ffe60014 DG |
87 | } |
88 | free(channel); | |
89 | } | |
3bd1e081 MD |
90 | |
91 | /* | |
ffe60014 | 92 | * Add channel to internal consumer state. |
3bd1e081 | 93 | * |
ffe60014 | 94 | * Returns 0 on success or else a negative value. |
3bd1e081 | 95 | */ |
ffe60014 DG |
96 | static int add_channel(struct lttng_consumer_channel *channel, |
97 | struct lttng_consumer_local_data *ctx) | |
3bd1e081 MD |
98 | { |
99 | int ret = 0; | |
100 | ||
ffe60014 DG |
101 | assert(channel); |
102 | assert(ctx); | |
103 | ||
104 | if (ctx->on_recv_channel != NULL) { | |
105 | ret = ctx->on_recv_channel(channel); | |
106 | if (ret == 0) { | |
d8ef542d | 107 | ret = consumer_add_channel(channel, ctx); |
ffe60014 DG |
108 | } else if (ret < 0) { |
109 | /* Most likely an ENOMEM. */ | |
110 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
111 | goto error; | |
112 | } | |
113 | } else { | |
d8ef542d | 114 | ret = consumer_add_channel(channel, ctx); |
3bd1e081 MD |
115 | } |
116 | ||
d88aee68 | 117 | DBG("UST consumer channel added (key: %" PRIu64 ")", channel->key); |
ffe60014 DG |
118 | |
119 | error: | |
3bd1e081 MD |
120 | return ret; |
121 | } | |
122 | ||
123 | /* | |
ffe60014 DG |
124 | * Allocate and return a consumer channel object. |
125 | */ | |
126 | static struct lttng_consumer_channel *allocate_channel(uint64_t session_id, | |
e5148e25 | 127 | const uint64_t *chunk_id, const char *pathname, const char *name, |
da009f2c | 128 | uint64_t relayd_id, uint64_t key, enum lttng_event_output output, |
2bba9e53 | 129 | uint64_t tracefile_size, uint64_t tracefile_count, |
ecc48a90 | 130 | uint64_t session_id_per_pid, unsigned int monitor, |
d7ba1388 | 131 | unsigned int live_timer_interval, |
3d071855 | 132 | const char *root_shm_path, const char *shm_path) |
ffe60014 DG |
133 | { |
134 | assert(pathname); | |
135 | assert(name); | |
136 | ||
e5148e25 JG |
137 | return consumer_allocate_channel(key, session_id, chunk_id, pathname, |
138 | name, relayd_id, output, tracefile_size, | |
d7ba1388 | 139 | tracefile_count, session_id_per_pid, monitor, |
3d071855 | 140 | live_timer_interval, root_shm_path, shm_path); |
ffe60014 DG |
141 | } |
142 | ||
143 | /* | |
144 | * Allocate and return a consumer stream object. If _alloc_ret is not NULL, the | |
145 | * error value if applicable is set in it else it is kept untouched. | |
3bd1e081 | 146 | * |
ffe60014 | 147 | * Return NULL on error else the newly allocated stream object. |
3bd1e081 | 148 | */ |
ffe60014 DG |
149 | static struct lttng_consumer_stream *allocate_stream(int cpu, int key, |
150 | struct lttng_consumer_channel *channel, | |
e5148e25 | 151 | struct lttng_consumer_local_data *ctx, int *_alloc_ret) |
ffe60014 DG |
152 | { |
153 | int alloc_ret; | |
154 | struct lttng_consumer_stream *stream = NULL; | |
155 | ||
156 | assert(channel); | |
157 | assert(ctx); | |
158 | ||
159 | stream = consumer_allocate_stream(channel->key, | |
160 | key, | |
ffe60014 | 161 | channel->name, |
ffe60014 DG |
162 | channel->relayd_id, |
163 | channel->session_id, | |
e5148e25 | 164 | channel->trace_chunk, |
ffe60014 DG |
165 | cpu, |
166 | &alloc_ret, | |
4891ece8 | 167 | channel->type, |
e5148e25 | 168 | channel->monitor); |
ffe60014 DG |
169 | if (stream == NULL) { |
170 | switch (alloc_ret) { | |
171 | case -ENOENT: | |
172 | /* | |
173 | * We could not find the channel. Can happen if cpu hotplug | |
174 | * happens while tearing down. | |
175 | */ | |
176 | DBG3("Could not find channel"); | |
177 | break; | |
178 | case -ENOMEM: | |
179 | case -EINVAL: | |
180 | default: | |
181 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
182 | break; | |
183 | } | |
184 | goto error; | |
185 | } | |
186 | ||
d9a2e16e | 187 | consumer_stream_update_channel_attributes(stream, channel); |
ffe60014 DG |
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) { | |
66d583dc | 210 | consumer_add_metadata_stream(stream); |
dae10966 | 211 | stream_pipe = ctx->consumer_metadata_pipe; |
ffe60014 | 212 | } else { |
66d583dc | 213 | consumer_add_data_stream(stream); |
dae10966 | 214 | stream_pipe = ctx->consumer_data_pipe; |
ffe60014 DG |
215 | } |
216 | ||
5ab66908 MD |
217 | /* |
218 | * From this point on, the stream's ownership has been moved away from | |
a8086cf4 JR |
219 | * the channel and it becomes globally visible. Hence, remove it from |
220 | * the local stream list to prevent the stream from being both local and | |
221 | * global. | |
5ab66908 MD |
222 | */ |
223 | stream->globally_visible = 1; | |
a8086cf4 | 224 | cds_list_del(&stream->send_node); |
5ab66908 | 225 | |
dae10966 | 226 | ret = lttng_pipe_write(stream_pipe, &stream, sizeof(stream)); |
ffe60014 | 227 | if (ret < 0) { |
dae10966 DG |
228 | ERR("Consumer write %s stream to pipe %d", |
229 | stream->metadata_flag ? "metadata" : "data", | |
230 | lttng_pipe_get_writefd(stream_pipe)); | |
5ab66908 MD |
231 | if (stream->metadata_flag) { |
232 | consumer_del_stream_for_metadata(stream); | |
233 | } else { | |
234 | consumer_del_stream_for_data(stream); | |
235 | } | |
a8086cf4 | 236 | goto error; |
ffe60014 | 237 | } |
a8086cf4 | 238 | |
5ab66908 | 239 | error: |
ffe60014 DG |
240 | return ret; |
241 | } | |
242 | ||
4628484a MD |
243 | static |
244 | int get_stream_shm_path(char *stream_shm_path, const char *shm_path, int cpu) | |
245 | { | |
45863397 | 246 | char cpu_nr[INT_MAX_STR_LEN]; /* int max len */ |
4628484a MD |
247 | int ret; |
248 | ||
249 | strncpy(stream_shm_path, shm_path, PATH_MAX); | |
250 | stream_shm_path[PATH_MAX - 1] = '\0'; | |
45863397 | 251 | ret = snprintf(cpu_nr, INT_MAX_STR_LEN, "%i", cpu); |
67f8cb8d MD |
252 | if (ret < 0) { |
253 | PERROR("snprintf"); | |
4628484a MD |
254 | goto end; |
255 | } | |
256 | strncat(stream_shm_path, cpu_nr, | |
257 | PATH_MAX - strlen(stream_shm_path) - 1); | |
258 | ret = 0; | |
259 | end: | |
260 | return ret; | |
261 | } | |
262 | ||
d88aee68 DG |
263 | /* |
264 | * Create streams for the given channel using liblttng-ust-ctl. | |
e5148e25 | 265 | * The channel lock must be acquired by the caller. |
d88aee68 DG |
266 | * |
267 | * Return 0 on success else a negative value. | |
268 | */ | |
ffe60014 | 269 | static int create_ust_streams(struct lttng_consumer_channel *channel, |
e5148e25 | 270 | struct lttng_consumer_local_data *ctx) |
ffe60014 DG |
271 | { |
272 | int ret, cpu = 0; | |
273 | struct ustctl_consumer_stream *ustream; | |
274 | struct lttng_consumer_stream *stream; | |
e5148e25 | 275 | pthread_mutex_t *current_stream_lock = NULL; |
ffe60014 DG |
276 | |
277 | assert(channel); | |
278 | assert(ctx); | |
279 | ||
280 | /* | |
281 | * While a stream is available from ustctl. When NULL is returned, we've | |
282 | * reached the end of the possible stream for the channel. | |
283 | */ | |
284 | while ((ustream = ustctl_create_stream(channel->uchan, cpu))) { | |
285 | int wait_fd; | |
04ef1097 | 286 | int ust_metadata_pipe[2]; |
ffe60014 | 287 | |
9ce5646a MD |
288 | health_code_update(); |
289 | ||
04ef1097 MD |
290 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && channel->monitor) { |
291 | ret = utils_create_pipe_cloexec_nonblock(ust_metadata_pipe); | |
292 | if (ret < 0) { | |
293 | ERR("Create ust metadata poll pipe"); | |
294 | goto error; | |
295 | } | |
296 | wait_fd = ust_metadata_pipe[0]; | |
297 | } else { | |
298 | wait_fd = ustctl_stream_get_wait_fd(ustream); | |
299 | } | |
ffe60014 DG |
300 | |
301 | /* Allocate consumer stream object. */ | |
e5148e25 | 302 | stream = allocate_stream(cpu, wait_fd, channel, ctx, &ret); |
ffe60014 DG |
303 | if (!stream) { |
304 | goto error_alloc; | |
305 | } | |
306 | stream->ustream = ustream; | |
307 | /* | |
308 | * Store it so we can save multiple function calls afterwards since | |
309 | * this value is used heavily in the stream threads. This is UST | |
310 | * specific so this is why it's done after allocation. | |
311 | */ | |
312 | stream->wait_fd = wait_fd; | |
313 | ||
b31398bb DG |
314 | /* |
315 | * Increment channel refcount since the channel reference has now been | |
316 | * assigned in the allocation process above. | |
317 | */ | |
10a50311 JD |
318 | if (stream->chan->monitor) { |
319 | uatomic_inc(&stream->chan->refcount); | |
320 | } | |
b31398bb | 321 | |
e5148e25 JG |
322 | pthread_mutex_lock(&stream->lock); |
323 | current_stream_lock = &stream->lock; | |
ffe60014 DG |
324 | /* |
325 | * Order is important this is why a list is used. On error, the caller | |
326 | * should clean this list. | |
327 | */ | |
328 | cds_list_add_tail(&stream->send_node, &channel->streams.head); | |
329 | ||
330 | ret = ustctl_get_max_subbuf_size(stream->ustream, | |
331 | &stream->max_sb_size); | |
332 | if (ret < 0) { | |
333 | ERR("ustctl_get_max_subbuf_size failed for stream %s", | |
334 | stream->name); | |
335 | goto error; | |
336 | } | |
337 | ||
338 | /* Do actions once stream has been received. */ | |
339 | if (ctx->on_recv_stream) { | |
340 | ret = ctx->on_recv_stream(stream); | |
341 | if (ret < 0) { | |
342 | goto error; | |
343 | } | |
344 | } | |
345 | ||
d88aee68 | 346 | DBG("UST consumer add stream %s (key: %" PRIu64 ") with relayd id %" PRIu64, |
ffe60014 DG |
347 | stream->name, stream->key, stream->relayd_stream_id); |
348 | ||
349 | /* Set next CPU stream. */ | |
350 | channel->streams.count = ++cpu; | |
d88aee68 DG |
351 | |
352 | /* Keep stream reference when creating metadata. */ | |
353 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) { | |
354 | channel->metadata_stream = stream; | |
8de4f941 JG |
355 | if (channel->monitor) { |
356 | /* Set metadata poll pipe if we created one */ | |
357 | memcpy(stream->ust_metadata_poll_pipe, | |
358 | ust_metadata_pipe, | |
359 | sizeof(ust_metadata_pipe)); | |
360 | } | |
d88aee68 | 361 | } |
e5148e25 JG |
362 | pthread_mutex_unlock(&stream->lock); |
363 | current_stream_lock = NULL; | |
ffe60014 DG |
364 | } |
365 | ||
366 | return 0; | |
367 | ||
368 | error: | |
369 | error_alloc: | |
e5148e25 JG |
370 | if (current_stream_lock) { |
371 | pthread_mutex_unlock(current_stream_lock); | |
372 | } | |
ffe60014 DG |
373 | return ret; |
374 | } | |
375 | ||
4628484a MD |
376 | /* |
377 | * create_posix_shm is never called concurrently within a process. | |
378 | */ | |
379 | static | |
380 | int create_posix_shm(void) | |
381 | { | |
382 | char tmp_name[NAME_MAX]; | |
383 | int shmfd, ret; | |
384 | ||
385 | ret = snprintf(tmp_name, NAME_MAX, "/ust-shm-consumer-%d", getpid()); | |
386 | if (ret < 0) { | |
387 | PERROR("snprintf"); | |
388 | return -1; | |
389 | } | |
390 | /* | |
391 | * Allocate shm, and immediately unlink its shm oject, keeping | |
392 | * only the file descriptor as a reference to the object. | |
393 | * We specifically do _not_ use the / at the beginning of the | |
394 | * pathname so that some OS implementations can keep it local to | |
395 | * the process (POSIX leaves this implementation-defined). | |
396 | */ | |
397 | shmfd = shm_open(tmp_name, O_CREAT | O_EXCL | O_RDWR, 0700); | |
398 | if (shmfd < 0) { | |
399 | PERROR("shm_open"); | |
400 | goto error_shm_open; | |
401 | } | |
402 | ret = shm_unlink(tmp_name); | |
403 | if (ret < 0 && errno != ENOENT) { | |
404 | PERROR("shm_unlink"); | |
405 | goto error_shm_release; | |
406 | } | |
407 | return shmfd; | |
408 | ||
409 | error_shm_release: | |
410 | ret = close(shmfd); | |
411 | if (ret) { | |
412 | PERROR("close"); | |
413 | } | |
414 | error_shm_open: | |
415 | return -1; | |
416 | } | |
417 | ||
e5148e25 JG |
418 | static int open_ust_stream_fd(struct lttng_consumer_channel *channel, int cpu, |
419 | const struct lttng_credentials *session_credentials) | |
4628484a MD |
420 | { |
421 | char shm_path[PATH_MAX]; | |
422 | int ret; | |
423 | ||
424 | if (!channel->shm_path[0]) { | |
425 | return create_posix_shm(); | |
426 | } | |
427 | ret = get_stream_shm_path(shm_path, channel->shm_path, cpu); | |
428 | if (ret) { | |
429 | goto error_shm_path; | |
430 | } | |
431 | return run_as_open(shm_path, | |
432 | O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR, | |
e5148e25 | 433 | session_credentials->uid, session_credentials->gid); |
4628484a MD |
434 | |
435 | error_shm_path: | |
436 | return -1; | |
437 | } | |
438 | ||
ffe60014 DG |
439 | /* |
440 | * Create an UST channel with the given attributes and send it to the session | |
441 | * daemon using the ust ctl API. | |
442 | * | |
443 | * Return 0 on success or else a negative value. | |
444 | */ | |
4628484a MD |
445 | static int create_ust_channel(struct lttng_consumer_channel *channel, |
446 | struct ustctl_consumer_channel_attr *attr, | |
447 | struct ustctl_consumer_channel **ust_chanp) | |
ffe60014 | 448 | { |
4628484a MD |
449 | int ret, nr_stream_fds, i, j; |
450 | int *stream_fds; | |
451 | struct ustctl_consumer_channel *ust_channel; | |
ffe60014 | 452 | |
4628484a | 453 | assert(channel); |
ffe60014 | 454 | assert(attr); |
4628484a | 455 | assert(ust_chanp); |
e5148e25 | 456 | assert(channel->buffer_credentials.is_set); |
ffe60014 DG |
457 | |
458 | DBG3("Creating channel to ustctl with attr: [overwrite: %d, " | |
459 | "subbuf_size: %" PRIu64 ", num_subbuf: %" PRIu64 ", " | |
460 | "switch_timer_interval: %u, read_timer_interval: %u, " | |
461 | "output: %d, type: %d", attr->overwrite, attr->subbuf_size, | |
462 | attr->num_subbuf, attr->switch_timer_interval, | |
463 | attr->read_timer_interval, attr->output, attr->type); | |
464 | ||
4628484a MD |
465 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) |
466 | nr_stream_fds = 1; | |
467 | else | |
468 | nr_stream_fds = ustctl_get_nr_stream_per_channel(); | |
469 | stream_fds = zmalloc(nr_stream_fds * sizeof(*stream_fds)); | |
470 | if (!stream_fds) { | |
471 | ret = -1; | |
472 | goto error_alloc; | |
473 | } | |
474 | for (i = 0; i < nr_stream_fds; i++) { | |
e5148e25 JG |
475 | stream_fds[i] = open_ust_stream_fd(channel, i, |
476 | &channel->buffer_credentials.value); | |
4628484a MD |
477 | if (stream_fds[i] < 0) { |
478 | ret = -1; | |
479 | goto error_open; | |
480 | } | |
481 | } | |
482 | ust_channel = ustctl_create_channel(attr, stream_fds, nr_stream_fds); | |
483 | if (!ust_channel) { | |
ffe60014 DG |
484 | ret = -1; |
485 | goto error_create; | |
486 | } | |
4628484a MD |
487 | channel->nr_stream_fds = nr_stream_fds; |
488 | channel->stream_fds = stream_fds; | |
489 | *ust_chanp = ust_channel; | |
ffe60014 DG |
490 | |
491 | return 0; | |
492 | ||
493 | error_create: | |
4628484a MD |
494 | error_open: |
495 | for (j = i - 1; j >= 0; j--) { | |
496 | int closeret; | |
497 | ||
498 | closeret = close(stream_fds[j]); | |
499 | if (closeret) { | |
500 | PERROR("close"); | |
501 | } | |
502 | if (channel->shm_path[0]) { | |
503 | char shm_path[PATH_MAX]; | |
504 | ||
505 | closeret = get_stream_shm_path(shm_path, | |
506 | channel->shm_path, j); | |
507 | if (closeret) { | |
508 | ERR("Cannot get stream shm path"); | |
509 | } | |
510 | closeret = run_as_unlink(shm_path, | |
e5148e25 JG |
511 | channel->buffer_credentials.value.uid, |
512 | channel->buffer_credentials.value.gid); | |
4628484a | 513 | if (closeret) { |
4628484a MD |
514 | PERROR("unlink %s", shm_path); |
515 | } | |
516 | } | |
517 | } | |
518 | /* Try to rmdir all directories under shm_path root. */ | |
519 | if (channel->root_shm_path[0]) { | |
602766ec | 520 | (void) run_as_rmdir_recursive(channel->root_shm_path, |
e5148e25 | 521 | channel->buffer_credentials.value.uid, |
58ec7253 MD |
522 | channel->buffer_credentials.value.gid, |
523 | LTTNG_DIRECTORY_HANDLE_SKIP_NON_EMPTY_FLAG); | |
4628484a MD |
524 | } |
525 | free(stream_fds); | |
526 | error_alloc: | |
ffe60014 DG |
527 | return ret; |
528 | } | |
529 | ||
d88aee68 DG |
530 | /* |
531 | * Send a single given stream to the session daemon using the sock. | |
532 | * | |
533 | * Return 0 on success else a negative value. | |
534 | */ | |
ffe60014 DG |
535 | static int send_sessiond_stream(int sock, struct lttng_consumer_stream *stream) |
536 | { | |
537 | int ret; | |
538 | ||
539 | assert(stream); | |
540 | assert(sock >= 0); | |
541 | ||
3eb914c0 | 542 | DBG("UST consumer sending stream %" PRIu64 " to sessiond", stream->key); |
ffe60014 DG |
543 | |
544 | /* Send stream to session daemon. */ | |
545 | ret = ustctl_send_stream_to_sessiond(sock, stream->ustream); | |
546 | if (ret < 0) { | |
547 | goto error; | |
548 | } | |
549 | ||
ffe60014 DG |
550 | error: |
551 | return ret; | |
552 | } | |
553 | ||
554 | /* | |
a3a86f35 | 555 | * Send channel to sessiond and relayd if applicable. |
ffe60014 | 556 | * |
d88aee68 | 557 | * Return 0 on success or else a negative value. |
ffe60014 | 558 | */ |
a3a86f35 | 559 | static int send_channel_to_sessiond_and_relayd(int sock, |
ffe60014 DG |
560 | struct lttng_consumer_channel *channel, |
561 | struct lttng_consumer_local_data *ctx, int *relayd_error) | |
562 | { | |
0c759fc9 | 563 | int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
ffe60014 | 564 | struct lttng_consumer_stream *stream; |
a4baae1b | 565 | uint64_t net_seq_idx = -1ULL; |
ffe60014 DG |
566 | |
567 | assert(channel); | |
568 | assert(ctx); | |
569 | assert(sock >= 0); | |
570 | ||
571 | DBG("UST consumer sending channel %s to sessiond", channel->name); | |
572 | ||
62285ea4 DG |
573 | if (channel->relayd_id != (uint64_t) -1ULL) { |
574 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
575 | |
576 | health_code_update(); | |
577 | ||
62285ea4 | 578 | /* Try to send the stream to the relayd if one is available. */ |
a3a86f35 JG |
579 | DBG("Sending stream %" PRIu64 " of channel \"%s\" to relayd", |
580 | stream->key, channel->name); | |
62285ea4 DG |
581 | ret = consumer_send_relayd_stream(stream, stream->chan->pathname); |
582 | if (ret < 0) { | |
583 | /* | |
584 | * Flag that the relayd was the problem here probably due to a | |
585 | * communicaton error on the socket. | |
586 | */ | |
587 | if (relayd_error) { | |
588 | *relayd_error = 1; | |
589 | } | |
725d28b2 | 590 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
ffe60014 | 591 | } |
a4baae1b JD |
592 | if (net_seq_idx == -1ULL) { |
593 | net_seq_idx = stream->net_seq_idx; | |
594 | } | |
595 | } | |
f2a444f1 | 596 | } |
ffe60014 | 597 | |
f2a444f1 DG |
598 | /* Inform sessiond that we are about to send channel and streams. */ |
599 | ret = consumer_send_status_msg(sock, ret_code); | |
0c759fc9 | 600 | if (ret < 0 || ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
f2a444f1 DG |
601 | /* |
602 | * Either the session daemon is not responding or the relayd died so we | |
603 | * stop now. | |
604 | */ | |
605 | goto error; | |
606 | } | |
607 | ||
608 | /* Send channel to sessiond. */ | |
609 | ret = ustctl_send_channel_to_sessiond(sock, channel->uchan); | |
610 | if (ret < 0) { | |
611 | goto error; | |
612 | } | |
613 | ||
614 | ret = ustctl_channel_close_wakeup_fd(channel->uchan); | |
615 | if (ret < 0) { | |
616 | goto error; | |
617 | } | |
618 | ||
619 | /* The channel was sent successfully to the sessiond at this point. */ | |
620 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
621 | |
622 | health_code_update(); | |
623 | ||
ffe60014 DG |
624 | /* Send stream to session daemon. */ |
625 | ret = send_sessiond_stream(sock, stream); | |
626 | if (ret < 0) { | |
627 | goto error; | |
628 | } | |
629 | } | |
630 | ||
631 | /* Tell sessiond there is no more stream. */ | |
632 | ret = ustctl_send_stream_to_sessiond(sock, NULL); | |
633 | if (ret < 0) { | |
634 | goto error; | |
635 | } | |
636 | ||
637 | DBG("UST consumer NULL stream sent to sessiond"); | |
638 | ||
639 | return 0; | |
640 | ||
641 | error: | |
0c759fc9 | 642 | if (ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
f2a444f1 DG |
643 | ret = -1; |
644 | } | |
ffe60014 DG |
645 | return ret; |
646 | } | |
647 | ||
648 | /* | |
649 | * Creates a channel and streams and add the channel it to the channel internal | |
650 | * state. The created stream must ONLY be sent once the GET_CHANNEL command is | |
651 | * received. | |
652 | * | |
653 | * Return 0 on success or else, a negative value is returned and the channel | |
654 | * MUST be destroyed by consumer_del_channel(). | |
655 | */ | |
75cfe9e6 | 656 | static int ask_channel(struct lttng_consumer_local_data *ctx, |
ffe60014 | 657 | struct lttng_consumer_channel *channel, |
e5148e25 | 658 | struct ustctl_consumer_channel_attr *attr) |
3bd1e081 MD |
659 | { |
660 | int ret; | |
661 | ||
ffe60014 DG |
662 | assert(ctx); |
663 | assert(channel); | |
664 | assert(attr); | |
665 | ||
666 | /* | |
667 | * This value is still used by the kernel consumer since for the kernel, | |
668 | * the stream ownership is not IN the consumer so we need to have the | |
669 | * number of left stream that needs to be initialized so we can know when | |
670 | * to delete the channel (see consumer.c). | |
671 | * | |
672 | * As for the user space tracer now, the consumer creates and sends the | |
673 | * stream to the session daemon which only sends them to the application | |
674 | * once every stream of a channel is received making this value useless | |
675 | * because we they will be added to the poll thread before the application | |
676 | * receives them. This ensures that a stream can not hang up during | |
677 | * initilization of a channel. | |
678 | */ | |
679 | channel->nb_init_stream_left = 0; | |
680 | ||
681 | /* The reply msg status is handled in the following call. */ | |
4628484a | 682 | ret = create_ust_channel(channel, attr, &channel->uchan); |
ffe60014 | 683 | if (ret < 0) { |
10a50311 | 684 | goto end; |
3bd1e081 MD |
685 | } |
686 | ||
d8ef542d MD |
687 | channel->wait_fd = ustctl_channel_get_wait_fd(channel->uchan); |
688 | ||
10a50311 JD |
689 | /* |
690 | * For the snapshots (no monitor), we create the metadata streams | |
691 | * on demand, not during the channel creation. | |
692 | */ | |
693 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && !channel->monitor) { | |
694 | ret = 0; | |
695 | goto end; | |
696 | } | |
697 | ||
ffe60014 | 698 | /* Open all streams for this channel. */ |
e5148e25 JG |
699 | pthread_mutex_lock(&channel->lock); |
700 | ret = create_ust_streams(channel, ctx); | |
701 | pthread_mutex_unlock(&channel->lock); | |
ffe60014 | 702 | if (ret < 0) { |
10a50311 | 703 | goto end; |
ffe60014 DG |
704 | } |
705 | ||
10a50311 | 706 | end: |
3bd1e081 MD |
707 | return ret; |
708 | } | |
709 | ||
d88aee68 DG |
710 | /* |
711 | * Send all stream of a channel to the right thread handling it. | |
712 | * | |
713 | * On error, return a negative value else 0 on success. | |
714 | */ | |
715 | static int send_streams_to_thread(struct lttng_consumer_channel *channel, | |
716 | struct lttng_consumer_local_data *ctx) | |
717 | { | |
718 | int ret = 0; | |
719 | struct lttng_consumer_stream *stream, *stmp; | |
720 | ||
721 | assert(channel); | |
722 | assert(ctx); | |
723 | ||
724 | /* Send streams to the corresponding thread. */ | |
725 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
726 | send_node) { | |
9ce5646a MD |
727 | |
728 | health_code_update(); | |
729 | ||
d88aee68 DG |
730 | /* Sending the stream to the thread. */ |
731 | ret = send_stream_to_thread(stream, ctx); | |
732 | if (ret < 0) { | |
733 | /* | |
734 | * If we are unable to send the stream to the thread, there is | |
735 | * a big problem so just stop everything. | |
736 | */ | |
737 | goto error; | |
738 | } | |
d88aee68 DG |
739 | } |
740 | ||
741 | error: | |
742 | return ret; | |
743 | } | |
744 | ||
7972aab2 DG |
745 | /* |
746 | * Flush channel's streams using the given key to retrieve the channel. | |
747 | * | |
748 | * Return 0 on success else an LTTng error code. | |
749 | */ | |
750 | static int flush_channel(uint64_t chan_key) | |
751 | { | |
752 | int ret = 0; | |
753 | struct lttng_consumer_channel *channel; | |
754 | struct lttng_consumer_stream *stream; | |
755 | struct lttng_ht *ht; | |
756 | struct lttng_ht_iter iter; | |
757 | ||
8fd623e0 | 758 | DBG("UST consumer flush channel key %" PRIu64, chan_key); |
7972aab2 | 759 | |
a500c257 | 760 | rcu_read_lock(); |
7972aab2 DG |
761 | channel = consumer_find_channel(chan_key); |
762 | if (!channel) { | |
8fd623e0 | 763 | ERR("UST consumer flush channel %" PRIu64 " not found", chan_key); |
7972aab2 DG |
764 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
765 | goto error; | |
766 | } | |
767 | ||
768 | ht = consumer_data.stream_per_chan_id_ht; | |
769 | ||
770 | /* For each stream of the channel id, flush it. */ | |
7972aab2 DG |
771 | cds_lfht_for_each_entry_duplicate(ht->ht, |
772 | ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct, | |
773 | &channel->key, &iter.iter, stream, node_channel_id.node) { | |
9ce5646a MD |
774 | |
775 | health_code_update(); | |
776 | ||
0dd01979 MD |
777 | pthread_mutex_lock(&stream->lock); |
778 | if (!stream->quiescent) { | |
779 | ustctl_flush_buffer(stream->ustream, 0); | |
780 | stream->quiescent = true; | |
781 | } | |
782 | pthread_mutex_unlock(&stream->lock); | |
783 | } | |
784 | error: | |
785 | rcu_read_unlock(); | |
786 | return ret; | |
787 | } | |
788 | ||
789 | /* | |
790 | * Clear quiescent state from channel's streams using the given key to | |
791 | * retrieve the channel. | |
792 | * | |
793 | * Return 0 on success else an LTTng error code. | |
794 | */ | |
795 | static int clear_quiescent_channel(uint64_t chan_key) | |
796 | { | |
797 | int ret = 0; | |
798 | struct lttng_consumer_channel *channel; | |
799 | struct lttng_consumer_stream *stream; | |
800 | struct lttng_ht *ht; | |
801 | struct lttng_ht_iter iter; | |
802 | ||
803 | DBG("UST consumer clear quiescent channel key %" PRIu64, chan_key); | |
804 | ||
805 | rcu_read_lock(); | |
806 | channel = consumer_find_channel(chan_key); | |
807 | if (!channel) { | |
808 | ERR("UST consumer clear quiescent channel %" PRIu64 " not found", chan_key); | |
809 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
810 | goto error; | |
811 | } | |
812 | ||
813 | ht = consumer_data.stream_per_chan_id_ht; | |
814 | ||
815 | /* For each stream of the channel id, clear quiescent state. */ | |
816 | cds_lfht_for_each_entry_duplicate(ht->ht, | |
817 | ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct, | |
818 | &channel->key, &iter.iter, stream, node_channel_id.node) { | |
819 | ||
820 | health_code_update(); | |
821 | ||
822 | pthread_mutex_lock(&stream->lock); | |
823 | stream->quiescent = false; | |
824 | pthread_mutex_unlock(&stream->lock); | |
7972aab2 | 825 | } |
7972aab2 | 826 | error: |
a500c257 | 827 | rcu_read_unlock(); |
7972aab2 DG |
828 | return ret; |
829 | } | |
830 | ||
d88aee68 DG |
831 | /* |
832 | * Close metadata stream wakeup_fd using the given key to retrieve the channel. | |
833 | * | |
834 | * Return 0 on success else an LTTng error code. | |
835 | */ | |
836 | static int close_metadata(uint64_t chan_key) | |
837 | { | |
ea88ca2a | 838 | int ret = 0; |
d88aee68 | 839 | struct lttng_consumer_channel *channel; |
f65a74be | 840 | unsigned int channel_monitor; |
d88aee68 | 841 | |
8fd623e0 | 842 | DBG("UST consumer close metadata key %" PRIu64, chan_key); |
d88aee68 DG |
843 | |
844 | channel = consumer_find_channel(chan_key); | |
845 | if (!channel) { | |
84cc9aa0 DG |
846 | /* |
847 | * This is possible if the metadata thread has issue a delete because | |
848 | * the endpoint point of the stream hung up. There is no way the | |
849 | * session daemon can know about it thus use a DBG instead of an actual | |
850 | * error. | |
851 | */ | |
852 | DBG("UST consumer close metadata %" PRIu64 " not found", chan_key); | |
d88aee68 DG |
853 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
854 | goto error; | |
855 | } | |
856 | ||
ea88ca2a | 857 | pthread_mutex_lock(&consumer_data.lock); |
a9838785 | 858 | pthread_mutex_lock(&channel->lock); |
f65a74be | 859 | channel_monitor = channel->monitor; |
73811ecc DG |
860 | if (cds_lfht_is_node_deleted(&channel->node.node)) { |
861 | goto error_unlock; | |
862 | } | |
863 | ||
6d574024 | 864 | lttng_ustconsumer_close_metadata(channel); |
f65a74be JG |
865 | pthread_mutex_unlock(&channel->lock); |
866 | pthread_mutex_unlock(&consumer_data.lock); | |
d88aee68 | 867 | |
f65a74be JG |
868 | /* |
869 | * The ownership of a metadata channel depends on the type of | |
870 | * session to which it belongs. In effect, the monitor flag is checked | |
871 | * to determine if this metadata channel is in "snapshot" mode or not. | |
872 | * | |
873 | * In the non-snapshot case, the metadata channel is created along with | |
874 | * a single stream which will remain present until the metadata channel | |
875 | * is destroyed (on the destruction of its session). In this case, the | |
876 | * metadata stream in "monitored" by the metadata poll thread and holds | |
877 | * the ownership of its channel. | |
878 | * | |
879 | * Closing the metadata will cause the metadata stream's "metadata poll | |
880 | * pipe" to be closed. Closing this pipe will wake-up the metadata poll | |
881 | * thread which will teardown the metadata stream which, in return, | |
882 | * deletes the metadata channel. | |
883 | * | |
884 | * In the snapshot case, the metadata stream is created and destroyed | |
885 | * on every snapshot record. Since the channel doesn't have an owner | |
886 | * other than the session daemon, it is safe to destroy it immediately | |
887 | * on reception of the CLOSE_METADATA command. | |
888 | */ | |
889 | if (!channel_monitor) { | |
890 | /* | |
891 | * The channel and consumer_data locks must be | |
892 | * released before this call since consumer_del_channel | |
893 | * re-acquires the channel and consumer_data locks to teardown | |
894 | * the channel and queue its reclamation by the "call_rcu" | |
895 | * worker thread. | |
896 | */ | |
897 | consumer_del_channel(channel); | |
898 | } | |
899 | ||
900 | return ret; | |
ea88ca2a | 901 | error_unlock: |
a9838785 | 902 | pthread_mutex_unlock(&channel->lock); |
ea88ca2a | 903 | pthread_mutex_unlock(&consumer_data.lock); |
d88aee68 DG |
904 | error: |
905 | return ret; | |
906 | } | |
907 | ||
908 | /* | |
909 | * RCU read side lock MUST be acquired before calling this function. | |
910 | * | |
911 | * Return 0 on success else an LTTng error code. | |
912 | */ | |
913 | static int setup_metadata(struct lttng_consumer_local_data *ctx, uint64_t key) | |
914 | { | |
915 | int ret; | |
916 | struct lttng_consumer_channel *metadata; | |
917 | ||
8fd623e0 | 918 | DBG("UST consumer setup metadata key %" PRIu64, key); |
d88aee68 DG |
919 | |
920 | metadata = consumer_find_channel(key); | |
921 | if (!metadata) { | |
922 | ERR("UST consumer push metadata %" PRIu64 " not found", key); | |
923 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
10a50311 JD |
924 | goto end; |
925 | } | |
926 | ||
927 | /* | |
928 | * In no monitor mode, the metadata channel has no stream(s) so skip the | |
929 | * ownership transfer to the metadata thread. | |
930 | */ | |
931 | if (!metadata->monitor) { | |
932 | DBG("Metadata channel in no monitor"); | |
933 | ret = 0; | |
934 | goto end; | |
d88aee68 DG |
935 | } |
936 | ||
937 | /* | |
938 | * Send metadata stream to relayd if one available. Availability is | |
939 | * known if the stream is still in the list of the channel. | |
940 | */ | |
941 | if (cds_list_empty(&metadata->streams.head)) { | |
942 | ERR("Metadata channel key %" PRIu64 ", no stream available.", key); | |
943 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
f5a0c9cf | 944 | goto error_no_stream; |
d88aee68 DG |
945 | } |
946 | ||
947 | /* Send metadata stream to relayd if needed. */ | |
62285ea4 DG |
948 | if (metadata->metadata_stream->net_seq_idx != (uint64_t) -1ULL) { |
949 | ret = consumer_send_relayd_stream(metadata->metadata_stream, | |
950 | metadata->pathname); | |
951 | if (ret < 0) { | |
952 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
953 | goto error; | |
954 | } | |
601262d6 JD |
955 | ret = consumer_send_relayd_streams_sent( |
956 | metadata->metadata_stream->net_seq_idx); | |
957 | if (ret < 0) { | |
958 | ret = LTTCOMM_CONSUMERD_RELAYD_FAIL; | |
959 | goto error; | |
960 | } | |
d88aee68 DG |
961 | } |
962 | ||
a8086cf4 JR |
963 | /* |
964 | * Ownership of metadata stream is passed along. Freeing is handled by | |
965 | * the callee. | |
966 | */ | |
d88aee68 DG |
967 | ret = send_streams_to_thread(metadata, ctx); |
968 | if (ret < 0) { | |
969 | /* | |
970 | * If we are unable to send the stream to the thread, there is | |
971 | * a big problem so just stop everything. | |
972 | */ | |
973 | ret = LTTCOMM_CONSUMERD_FATAL; | |
a8086cf4 | 974 | goto send_streams_error; |
d88aee68 DG |
975 | } |
976 | /* List MUST be empty after or else it could be reused. */ | |
977 | assert(cds_list_empty(&metadata->streams.head)); | |
978 | ||
10a50311 JD |
979 | ret = 0; |
980 | goto end; | |
d88aee68 DG |
981 | |
982 | error: | |
f2a444f1 DG |
983 | /* |
984 | * Delete metadata channel on error. At this point, the metadata stream can | |
985 | * NOT be monitored by the metadata thread thus having the guarantee that | |
986 | * the stream is still in the local stream list of the channel. This call | |
987 | * will make sure to clean that list. | |
988 | */ | |
f5a0c9cf | 989 | consumer_stream_destroy(metadata->metadata_stream, NULL); |
212d67a2 DG |
990 | cds_list_del(&metadata->metadata_stream->send_node); |
991 | metadata->metadata_stream = NULL; | |
a8086cf4 | 992 | send_streams_error: |
f5a0c9cf | 993 | error_no_stream: |
10a50311 JD |
994 | end: |
995 | return ret; | |
996 | } | |
997 | ||
998 | /* | |
999 | * Snapshot the whole metadata. | |
e5148e25 | 1000 | * RCU read-side lock must be held by the caller. |
10a50311 JD |
1001 | * |
1002 | * Returns 0 on success, < 0 on error | |
1003 | */ | |
b0226bd4 MD |
1004 | static int snapshot_metadata(struct lttng_consumer_channel *metadata_channel, |
1005 | uint64_t key, char *path, uint64_t relayd_id, | |
e5148e25 | 1006 | struct lttng_consumer_local_data *ctx) |
10a50311 JD |
1007 | { |
1008 | int ret = 0; | |
10a50311 JD |
1009 | struct lttng_consumer_stream *metadata_stream; |
1010 | ||
1011 | assert(path); | |
1012 | assert(ctx); | |
1013 | ||
1014 | DBG("UST consumer snapshot metadata with key %" PRIu64 " at path %s", | |
1015 | key, path); | |
1016 | ||
1017 | rcu_read_lock(); | |
1018 | ||
10a50311 JD |
1019 | assert(!metadata_channel->monitor); |
1020 | ||
9ce5646a MD |
1021 | health_code_update(); |
1022 | ||
10a50311 JD |
1023 | /* |
1024 | * Ask the sessiond if we have new metadata waiting and update the | |
1025 | * consumer metadata cache. | |
1026 | */ | |
94d49140 | 1027 | ret = lttng_ustconsumer_request_metadata(ctx, metadata_channel, 0, 1); |
10a50311 JD |
1028 | if (ret < 0) { |
1029 | goto error; | |
1030 | } | |
1031 | ||
9ce5646a MD |
1032 | health_code_update(); |
1033 | ||
10a50311 JD |
1034 | /* |
1035 | * The metadata stream is NOT created in no monitor mode when the channel | |
1036 | * is created on a sessiond ask channel command. | |
1037 | */ | |
e5148e25 | 1038 | ret = create_ust_streams(metadata_channel, ctx); |
10a50311 JD |
1039 | if (ret < 0) { |
1040 | goto error; | |
1041 | } | |
1042 | ||
1043 | metadata_stream = metadata_channel->metadata_stream; | |
1044 | assert(metadata_stream); | |
1045 | ||
e5148e25 | 1046 | pthread_mutex_lock(&metadata_stream->lock); |
10a50311 JD |
1047 | if (relayd_id != (uint64_t) -1ULL) { |
1048 | metadata_stream->net_seq_idx = relayd_id; | |
1049 | ret = consumer_send_relayd_stream(metadata_stream, path); | |
10a50311 | 1050 | } else { |
e5148e25 JG |
1051 | ret = consumer_stream_create_output_files(metadata_stream, |
1052 | false); | |
1053 | } | |
1054 | pthread_mutex_unlock(&metadata_stream->lock); | |
1055 | if (ret < 0) { | |
1056 | goto error_stream; | |
10a50311 JD |
1057 | } |
1058 | ||
04ef1097 | 1059 | do { |
9ce5646a MD |
1060 | health_code_update(); |
1061 | ||
10a50311 JD |
1062 | ret = lttng_consumer_read_subbuffer(metadata_stream, ctx); |
1063 | if (ret < 0) { | |
94d49140 | 1064 | goto error_stream; |
10a50311 | 1065 | } |
04ef1097 | 1066 | } while (ret > 0); |
10a50311 | 1067 | |
10a50311 JD |
1068 | error_stream: |
1069 | /* | |
1070 | * Clean up the stream completly because the next snapshot will use a new | |
1071 | * metadata stream. | |
1072 | */ | |
e5148e25 | 1073 | pthread_mutex_lock(&metadata_stream->lock); |
10a50311 | 1074 | consumer_stream_destroy(metadata_stream, NULL); |
212d67a2 | 1075 | cds_list_del(&metadata_stream->send_node); |
10a50311 JD |
1076 | metadata_channel->metadata_stream = NULL; |
1077 | ||
1078 | error: | |
1079 | rcu_read_unlock(); | |
1080 | return ret; | |
1081 | } | |
1082 | ||
1083 | /* | |
1084 | * Take a snapshot of all the stream of a channel. | |
e5148e25 | 1085 | * RCU read-side lock and the channel lock must be held by the caller. |
10a50311 JD |
1086 | * |
1087 | * Returns 0 on success, < 0 on error | |
1088 | */ | |
b0226bd4 MD |
1089 | static int snapshot_channel(struct lttng_consumer_channel *channel, |
1090 | uint64_t key, char *path, uint64_t relayd_id, | |
e098433c JG |
1091 | uint64_t nb_packets_per_stream, |
1092 | struct lttng_consumer_local_data *ctx) | |
10a50311 JD |
1093 | { |
1094 | int ret; | |
1095 | unsigned use_relayd = 0; | |
1096 | unsigned long consumed_pos, produced_pos; | |
10a50311 JD |
1097 | struct lttng_consumer_stream *stream; |
1098 | ||
1099 | assert(path); | |
1100 | assert(ctx); | |
1101 | ||
1102 | rcu_read_lock(); | |
1103 | ||
1104 | if (relayd_id != (uint64_t) -1ULL) { | |
1105 | use_relayd = 1; | |
1106 | } | |
1107 | ||
10a50311 | 1108 | assert(!channel->monitor); |
6a00837f | 1109 | DBG("UST consumer snapshot channel %" PRIu64, key); |
10a50311 JD |
1110 | |
1111 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
1112 | health_code_update(); |
1113 | ||
10a50311 JD |
1114 | /* Lock stream because we are about to change its state. */ |
1115 | pthread_mutex_lock(&stream->lock); | |
e5148e25 JG |
1116 | assert(channel->trace_chunk); |
1117 | if (!lttng_trace_chunk_get(channel->trace_chunk)) { | |
1118 | /* | |
1119 | * Can't happen barring an internal error as the channel | |
1120 | * holds a reference to the trace chunk. | |
1121 | */ | |
1122 | ERR("Failed to acquire reference to channel's trace chunk"); | |
1123 | ret = -1; | |
1124 | goto error_unlock; | |
1125 | } | |
1126 | assert(!stream->trace_chunk); | |
1127 | stream->trace_chunk = channel->trace_chunk; | |
1128 | ||
10a50311 JD |
1129 | stream->net_seq_idx = relayd_id; |
1130 | ||
1131 | if (use_relayd) { | |
1132 | ret = consumer_send_relayd_stream(stream, path); | |
1133 | if (ret < 0) { | |
1134 | goto error_unlock; | |
1135 | } | |
1136 | } else { | |
e5148e25 JG |
1137 | ret = consumer_stream_create_output_files(stream, |
1138 | false); | |
10a50311 JD |
1139 | if (ret < 0) { |
1140 | goto error_unlock; | |
1141 | } | |
e5148e25 JG |
1142 | DBG("UST consumer snapshot stream (%" PRIu64 ")", |
1143 | stream->key); | |
10a50311 JD |
1144 | } |
1145 | ||
d4d80f77 MD |
1146 | /* |
1147 | * If tracing is active, we want to perform a "full" buffer flush. | |
1148 | * Else, if quiescent, it has already been done by the prior stop. | |
1149 | */ | |
1150 | if (!stream->quiescent) { | |
1151 | ustctl_flush_buffer(stream->ustream, 0); | |
1152 | } | |
10a50311 JD |
1153 | |
1154 | ret = lttng_ustconsumer_take_snapshot(stream); | |
1155 | if (ret < 0) { | |
1156 | ERR("Taking UST snapshot"); | |
1157 | goto error_unlock; | |
1158 | } | |
1159 | ||
1160 | ret = lttng_ustconsumer_get_produced_snapshot(stream, &produced_pos); | |
1161 | if (ret < 0) { | |
1162 | ERR("Produced UST snapshot position"); | |
1163 | goto error_unlock; | |
1164 | } | |
1165 | ||
1166 | ret = lttng_ustconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
1167 | if (ret < 0) { | |
1168 | ERR("Consumerd UST snapshot position"); | |
1169 | goto error_unlock; | |
1170 | } | |
1171 | ||
5c786ded JD |
1172 | /* |
1173 | * The original value is sent back if max stream size is larger than | |
d07ceecd | 1174 | * the possible size of the snapshot. Also, we assume that the session |
5c786ded JD |
1175 | * daemon should never send a maximum stream size that is lower than |
1176 | * subbuffer size. | |
1177 | */ | |
d07ceecd MD |
1178 | consumed_pos = consumer_get_consume_start_pos(consumed_pos, |
1179 | produced_pos, nb_packets_per_stream, | |
1180 | stream->max_sb_size); | |
5c786ded | 1181 | |
0fdaf1ed | 1182 | while ((long) (consumed_pos - produced_pos) < 0) { |
10a50311 JD |
1183 | ssize_t read_len; |
1184 | unsigned long len, padded_len; | |
1185 | ||
9ce5646a MD |
1186 | health_code_update(); |
1187 | ||
10a50311 JD |
1188 | DBG("UST consumer taking snapshot at pos %lu", consumed_pos); |
1189 | ||
1190 | ret = ustctl_get_subbuf(stream->ustream, &consumed_pos); | |
1191 | if (ret < 0) { | |
1192 | if (ret != -EAGAIN) { | |
1193 | PERROR("ustctl_get_subbuf snapshot"); | |
1194 | goto error_close_stream; | |
1195 | } | |
1196 | DBG("UST consumer get subbuf failed. Skipping it."); | |
1197 | consumed_pos += stream->max_sb_size; | |
ddc93ee4 | 1198 | stream->chan->lost_packets++; |
10a50311 JD |
1199 | continue; |
1200 | } | |
1201 | ||
1202 | ret = ustctl_get_subbuf_size(stream->ustream, &len); | |
1203 | if (ret < 0) { | |
1204 | ERR("Snapshot ustctl_get_subbuf_size"); | |
1205 | goto error_put_subbuf; | |
1206 | } | |
1207 | ||
1208 | ret = ustctl_get_padded_subbuf_size(stream->ustream, &padded_len); | |
1209 | if (ret < 0) { | |
1210 | ERR("Snapshot ustctl_get_padded_subbuf_size"); | |
1211 | goto error_put_subbuf; | |
1212 | } | |
1213 | ||
1214 | read_len = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, len, | |
309167d2 | 1215 | padded_len - len, NULL); |
10a50311 JD |
1216 | if (use_relayd) { |
1217 | if (read_len != len) { | |
56591bac | 1218 | ret = -EPERM; |
10a50311 JD |
1219 | goto error_put_subbuf; |
1220 | } | |
1221 | } else { | |
1222 | if (read_len != padded_len) { | |
56591bac | 1223 | ret = -EPERM; |
10a50311 JD |
1224 | goto error_put_subbuf; |
1225 | } | |
1226 | } | |
1227 | ||
1228 | ret = ustctl_put_subbuf(stream->ustream); | |
1229 | if (ret < 0) { | |
1230 | ERR("Snapshot ustctl_put_subbuf"); | |
1231 | goto error_close_stream; | |
1232 | } | |
1233 | consumed_pos += stream->max_sb_size; | |
1234 | } | |
1235 | ||
1236 | /* Simply close the stream so we can use it on the next snapshot. */ | |
1237 | consumer_stream_close(stream); | |
1238 | pthread_mutex_unlock(&stream->lock); | |
1239 | } | |
1240 | ||
1241 | rcu_read_unlock(); | |
1242 | return 0; | |
1243 | ||
1244 | error_put_subbuf: | |
1245 | if (ustctl_put_subbuf(stream->ustream) < 0) { | |
1246 | ERR("Snapshot ustctl_put_subbuf"); | |
1247 | } | |
1248 | error_close_stream: | |
1249 | consumer_stream_close(stream); | |
1250 | error_unlock: | |
1251 | pthread_mutex_unlock(&stream->lock); | |
10a50311 | 1252 | rcu_read_unlock(); |
d88aee68 DG |
1253 | return ret; |
1254 | } | |
1255 | ||
331744e3 | 1256 | /* |
c585821b MD |
1257 | * Receive the metadata updates from the sessiond. Supports receiving |
1258 | * overlapping metadata, but is needs to always belong to a contiguous | |
1259 | * range starting from 0. | |
1260 | * Be careful about the locks held when calling this function: it needs | |
1261 | * the metadata cache flush to concurrently progress in order to | |
1262 | * complete. | |
331744e3 JD |
1263 | */ |
1264 | int lttng_ustconsumer_recv_metadata(int sock, uint64_t key, uint64_t offset, | |
93ec662e JD |
1265 | uint64_t len, uint64_t version, |
1266 | struct lttng_consumer_channel *channel, int timer, int wait) | |
331744e3 | 1267 | { |
0c759fc9 | 1268 | int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
331744e3 JD |
1269 | char *metadata_str; |
1270 | ||
8fd623e0 | 1271 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, len); |
331744e3 JD |
1272 | |
1273 | metadata_str = zmalloc(len * sizeof(char)); | |
1274 | if (!metadata_str) { | |
1275 | PERROR("zmalloc metadata string"); | |
1276 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; | |
1277 | goto end; | |
1278 | } | |
1279 | ||
9ce5646a MD |
1280 | health_code_update(); |
1281 | ||
331744e3 JD |
1282 | /* Receive metadata string. */ |
1283 | ret = lttcomm_recv_unix_sock(sock, metadata_str, len); | |
1284 | if (ret < 0) { | |
1285 | /* Session daemon is dead so return gracefully. */ | |
1286 | ret_code = ret; | |
1287 | goto end_free; | |
1288 | } | |
1289 | ||
9ce5646a MD |
1290 | health_code_update(); |
1291 | ||
331744e3 | 1292 | pthread_mutex_lock(&channel->metadata_cache->lock); |
93ec662e JD |
1293 | ret = consumer_metadata_cache_write(channel, offset, len, version, |
1294 | metadata_str); | |
331744e3 JD |
1295 | if (ret < 0) { |
1296 | /* Unable to handle metadata. Notify session daemon. */ | |
1297 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
a32bd775 DG |
1298 | /* |
1299 | * Skip metadata flush on write error since the offset and len might | |
1300 | * not have been updated which could create an infinite loop below when | |
1301 | * waiting for the metadata cache to be flushed. | |
1302 | */ | |
1303 | pthread_mutex_unlock(&channel->metadata_cache->lock); | |
a32bd775 | 1304 | goto end_free; |
331744e3 JD |
1305 | } |
1306 | pthread_mutex_unlock(&channel->metadata_cache->lock); | |
1307 | ||
94d49140 JD |
1308 | if (!wait) { |
1309 | goto end_free; | |
1310 | } | |
5e41ebe1 | 1311 | while (consumer_metadata_cache_flushed(channel, offset + len, timer)) { |
331744e3 | 1312 | DBG("Waiting for metadata to be flushed"); |
9ce5646a MD |
1313 | |
1314 | health_code_update(); | |
1315 | ||
331744e3 JD |
1316 | usleep(DEFAULT_METADATA_AVAILABILITY_WAIT_TIME); |
1317 | } | |
1318 | ||
1319 | end_free: | |
1320 | free(metadata_str); | |
1321 | end: | |
1322 | return ret_code; | |
1323 | } | |
1324 | ||
4cbc1a04 DG |
1325 | /* |
1326 | * Receive command from session daemon and process it. | |
1327 | * | |
1328 | * Return 1 on success else a negative value or 0. | |
1329 | */ | |
3bd1e081 MD |
1330 | int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
1331 | int sock, struct pollfd *consumer_sockpoll) | |
1332 | { | |
1333 | ssize_t ret; | |
0c759fc9 | 1334 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
3bd1e081 | 1335 | struct lttcomm_consumer_msg msg; |
ffe60014 | 1336 | struct lttng_consumer_channel *channel = NULL; |
3bd1e081 | 1337 | |
9ce5646a MD |
1338 | health_code_update(); |
1339 | ||
3bd1e081 MD |
1340 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); |
1341 | if (ret != sizeof(msg)) { | |
173af62f DG |
1342 | DBG("Consumer received unexpected message size %zd (expects %zu)", |
1343 | ret, sizeof(msg)); | |
3be74084 DG |
1344 | /* |
1345 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
1346 | * since the caller handles this. | |
1347 | */ | |
489f70e9 | 1348 | if (ret > 0) { |
c6857fcf | 1349 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
489f70e9 MD |
1350 | ret = -1; |
1351 | } | |
3bd1e081 MD |
1352 | return ret; |
1353 | } | |
9ce5646a MD |
1354 | |
1355 | health_code_update(); | |
1356 | ||
84382d49 MD |
1357 | /* deprecated */ |
1358 | assert(msg.cmd_type != LTTNG_CONSUMER_STOP); | |
3bd1e081 | 1359 | |
9ce5646a MD |
1360 | health_code_update(); |
1361 | ||
3f8e211f | 1362 | /* relayd needs RCU read-side lock */ |
b0b335c8 MD |
1363 | rcu_read_lock(); |
1364 | ||
3bd1e081 | 1365 | switch (msg.cmd_type) { |
00e2e675 DG |
1366 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
1367 | { | |
f50f23d9 | 1368 | /* Session daemon status message are handled in the following call. */ |
2527bf85 | 1369 | consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
7735ef9e | 1370 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, |
d3e2ba59 JD |
1371 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id, |
1372 | msg.u.relayd_sock.relayd_session_id); | |
00e2e675 DG |
1373 | goto end_nosignal; |
1374 | } | |
173af62f DG |
1375 | case LTTNG_CONSUMER_DESTROY_RELAYD: |
1376 | { | |
a6ba4fe1 | 1377 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
173af62f DG |
1378 | struct consumer_relayd_sock_pair *relayd; |
1379 | ||
a6ba4fe1 | 1380 | DBG("UST consumer destroying relayd %" PRIu64, index); |
173af62f DG |
1381 | |
1382 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 1383 | relayd = consumer_find_relayd(index); |
173af62f | 1384 | if (relayd == NULL) { |
3448e266 | 1385 | DBG("Unable to find relayd %" PRIu64, index); |
e462382a | 1386 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
173af62f DG |
1387 | } |
1388 | ||
a6ba4fe1 DG |
1389 | /* |
1390 | * Each relayd socket pair has a refcount of stream attached to it | |
1391 | * which tells if the relayd is still active or not depending on the | |
1392 | * refcount value. | |
1393 | * | |
1394 | * This will set the destroy flag of the relayd object and destroy it | |
1395 | * if the refcount reaches zero when called. | |
1396 | * | |
1397 | * The destroy can happen either here or when a stream fd hangs up. | |
1398 | */ | |
f50f23d9 DG |
1399 | if (relayd) { |
1400 | consumer_flag_relayd_for_destroy(relayd); | |
1401 | } | |
1402 | ||
d88aee68 | 1403 | goto end_msg_sessiond; |
173af62f | 1404 | } |
3bd1e081 MD |
1405 | case LTTNG_CONSUMER_UPDATE_STREAM: |
1406 | { | |
3f8e211f | 1407 | rcu_read_unlock(); |
7ad0a0cb | 1408 | return -ENOSYS; |
3bd1e081 | 1409 | } |
6d805429 | 1410 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 1411 | { |
3be74084 | 1412 | int ret, is_data_pending; |
6d805429 | 1413 | uint64_t id = msg.u.data_pending.session_id; |
ca22feea | 1414 | |
6d805429 | 1415 | DBG("UST consumer data pending command for id %" PRIu64, id); |
ca22feea | 1416 | |
3be74084 | 1417 | is_data_pending = consumer_data_pending(id); |
ca22feea DG |
1418 | |
1419 | /* Send back returned value to session daemon */ | |
3be74084 DG |
1420 | ret = lttcomm_send_unix_sock(sock, &is_data_pending, |
1421 | sizeof(is_data_pending)); | |
ca22feea | 1422 | if (ret < 0) { |
3be74084 | 1423 | DBG("Error when sending the data pending ret code: %d", ret); |
489f70e9 | 1424 | goto error_fatal; |
ca22feea | 1425 | } |
f50f23d9 DG |
1426 | |
1427 | /* | |
1428 | * No need to send back a status message since the data pending | |
1429 | * returned value is the response. | |
1430 | */ | |
ca22feea | 1431 | break; |
53632229 | 1432 | } |
ffe60014 DG |
1433 | case LTTNG_CONSUMER_ASK_CHANNEL_CREATION: |
1434 | { | |
1435 | int ret; | |
1436 | struct ustctl_consumer_channel_attr attr; | |
e5148e25 JG |
1437 | const uint64_t chunk_id = msg.u.ask_channel.chunk_id.value; |
1438 | const struct lttng_credentials buffer_credentials = { | |
1439 | .uid = msg.u.ask_channel.buffer_credentials.uid, | |
1440 | .gid = msg.u.ask_channel.buffer_credentials.gid, | |
1441 | }; | |
ffe60014 DG |
1442 | |
1443 | /* Create a plain object and reserve a channel key. */ | |
1444 | channel = allocate_channel(msg.u.ask_channel.session_id, | |
e5148e25 JG |
1445 | msg.u.ask_channel.chunk_id.is_set ? |
1446 | &chunk_id : NULL, | |
1447 | msg.u.ask_channel.pathname, | |
1448 | msg.u.ask_channel.name, | |
1449 | msg.u.ask_channel.relayd_id, | |
1450 | msg.u.ask_channel.key, | |
1624d5b7 JD |
1451 | (enum lttng_event_output) msg.u.ask_channel.output, |
1452 | msg.u.ask_channel.tracefile_size, | |
2bba9e53 | 1453 | msg.u.ask_channel.tracefile_count, |
1950109e | 1454 | msg.u.ask_channel.session_id_per_pid, |
ecc48a90 | 1455 | msg.u.ask_channel.monitor, |
d7ba1388 | 1456 | msg.u.ask_channel.live_timer_interval, |
3d071855 | 1457 | msg.u.ask_channel.root_shm_path, |
d7ba1388 | 1458 | msg.u.ask_channel.shm_path); |
ffe60014 DG |
1459 | if (!channel) { |
1460 | goto end_channel_error; | |
1461 | } | |
1462 | ||
e5148e25 JG |
1463 | LTTNG_OPTIONAL_SET(&channel->buffer_credentials, |
1464 | buffer_credentials); | |
1465 | ||
567eb353 DG |
1466 | /* |
1467 | * Assign UST application UID to the channel. This value is ignored for | |
1468 | * per PID buffers. This is specific to UST thus setting this after the | |
1469 | * allocation. | |
1470 | */ | |
1471 | channel->ust_app_uid = msg.u.ask_channel.ust_app_uid; | |
1472 | ||
ffe60014 DG |
1473 | /* Build channel attributes from received message. */ |
1474 | attr.subbuf_size = msg.u.ask_channel.subbuf_size; | |
1475 | attr.num_subbuf = msg.u.ask_channel.num_subbuf; | |
1476 | attr.overwrite = msg.u.ask_channel.overwrite; | |
1477 | attr.switch_timer_interval = msg.u.ask_channel.switch_timer_interval; | |
1478 | attr.read_timer_interval = msg.u.ask_channel.read_timer_interval; | |
7972aab2 | 1479 | attr.chan_id = msg.u.ask_channel.chan_id; |
ffe60014 | 1480 | memcpy(attr.uuid, msg.u.ask_channel.uuid, sizeof(attr.uuid)); |
491d1539 | 1481 | attr.blocking_timeout= msg.u.ask_channel.blocking_timeout; |
ffe60014 | 1482 | |
0c759fc9 DG |
1483 | /* Match channel buffer type to the UST abi. */ |
1484 | switch (msg.u.ask_channel.output) { | |
1485 | case LTTNG_EVENT_MMAP: | |
1486 | default: | |
1487 | attr.output = LTTNG_UST_MMAP; | |
1488 | break; | |
1489 | } | |
1490 | ||
ffe60014 DG |
1491 | /* Translate and save channel type. */ |
1492 | switch (msg.u.ask_channel.type) { | |
1493 | case LTTNG_UST_CHAN_PER_CPU: | |
1494 | channel->type = CONSUMER_CHANNEL_TYPE_DATA; | |
1495 | attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8633d6e3 MD |
1496 | /* |
1497 | * Set refcount to 1 for owner. Below, we will | |
1498 | * pass ownership to the | |
1499 | * consumer_thread_channel_poll() thread. | |
1500 | */ | |
1501 | channel->refcount = 1; | |
ffe60014 DG |
1502 | break; |
1503 | case LTTNG_UST_CHAN_METADATA: | |
1504 | channel->type = CONSUMER_CHANNEL_TYPE_METADATA; | |
1505 | attr.type = LTTNG_UST_CHAN_METADATA; | |
1506 | break; | |
1507 | default: | |
1508 | assert(0); | |
1509 | goto error_fatal; | |
1510 | }; | |
1511 | ||
9ce5646a MD |
1512 | health_code_update(); |
1513 | ||
e5148e25 | 1514 | ret = ask_channel(ctx, channel, &attr); |
ffe60014 DG |
1515 | if (ret < 0) { |
1516 | goto end_channel_error; | |
1517 | } | |
1518 | ||
fc643247 MD |
1519 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
1520 | ret = consumer_metadata_cache_allocate(channel); | |
1521 | if (ret < 0) { | |
1522 | ERR("Allocating metadata cache"); | |
1523 | goto end_channel_error; | |
1524 | } | |
1525 | consumer_timer_switch_start(channel, attr.switch_timer_interval); | |
1526 | attr.switch_timer_interval = 0; | |
94d49140 | 1527 | } else { |
e9404c27 JG |
1528 | int monitor_start_ret; |
1529 | ||
94d49140 JD |
1530 | consumer_timer_live_start(channel, |
1531 | msg.u.ask_channel.live_timer_interval); | |
e9404c27 JG |
1532 | monitor_start_ret = consumer_timer_monitor_start( |
1533 | channel, | |
1534 | msg.u.ask_channel.monitor_timer_interval); | |
1535 | if (monitor_start_ret < 0) { | |
1536 | ERR("Starting channel monitoring timer failed"); | |
1537 | goto end_channel_error; | |
1538 | } | |
fc643247 MD |
1539 | } |
1540 | ||
9ce5646a MD |
1541 | health_code_update(); |
1542 | ||
ffe60014 DG |
1543 | /* |
1544 | * Add the channel to the internal state AFTER all streams were created | |
1545 | * and successfully sent to session daemon. This way, all streams must | |
1546 | * be ready before this channel is visible to the threads. | |
fc643247 MD |
1547 | * If add_channel succeeds, ownership of the channel is |
1548 | * passed to consumer_thread_channel_poll(). | |
ffe60014 DG |
1549 | */ |
1550 | ret = add_channel(channel, ctx); | |
1551 | if (ret < 0) { | |
ea88ca2a MD |
1552 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
1553 | if (channel->switch_timer_enabled == 1) { | |
1554 | consumer_timer_switch_stop(channel); | |
1555 | } | |
1556 | consumer_metadata_cache_destroy(channel); | |
1557 | } | |
d3e2ba59 JD |
1558 | if (channel->live_timer_enabled == 1) { |
1559 | consumer_timer_live_stop(channel); | |
1560 | } | |
e9404c27 JG |
1561 | if (channel->monitor_timer_enabled == 1) { |
1562 | consumer_timer_monitor_stop(channel); | |
1563 | } | |
ffe60014 DG |
1564 | goto end_channel_error; |
1565 | } | |
1566 | ||
9ce5646a MD |
1567 | health_code_update(); |
1568 | ||
ffe60014 DG |
1569 | /* |
1570 | * Channel and streams are now created. Inform the session daemon that | |
1571 | * everything went well and should wait to receive the channel and | |
1572 | * streams with ustctl API. | |
1573 | */ | |
1574 | ret = consumer_send_status_channel(sock, channel); | |
1575 | if (ret < 0) { | |
1576 | /* | |
489f70e9 | 1577 | * There is probably a problem on the socket. |
ffe60014 | 1578 | */ |
489f70e9 | 1579 | goto error_fatal; |
ffe60014 DG |
1580 | } |
1581 | ||
1582 | break; | |
1583 | } | |
1584 | case LTTNG_CONSUMER_GET_CHANNEL: | |
1585 | { | |
1586 | int ret, relayd_err = 0; | |
d88aee68 | 1587 | uint64_t key = msg.u.get_channel.key; |
ffe60014 | 1588 | struct lttng_consumer_channel *channel; |
ffe60014 DG |
1589 | |
1590 | channel = consumer_find_channel(key); | |
1591 | if (!channel) { | |
8fd623e0 | 1592 | ERR("UST consumer get channel key %" PRIu64 " not found", key); |
e462382a | 1593 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
ffe60014 DG |
1594 | goto end_msg_sessiond; |
1595 | } | |
1596 | ||
9ce5646a MD |
1597 | health_code_update(); |
1598 | ||
a3a86f35 JG |
1599 | /* Send the channel to sessiond (and relayd, if applicable). */ |
1600 | ret = send_channel_to_sessiond_and_relayd(sock, channel, ctx, | |
1601 | &relayd_err); | |
ffe60014 DG |
1602 | if (ret < 0) { |
1603 | if (relayd_err) { | |
1604 | /* | |
1605 | * We were unable to send to the relayd the stream so avoid | |
1606 | * sending back a fatal error to the thread since this is OK | |
f2a444f1 DG |
1607 | * and the consumer can continue its work. The above call |
1608 | * has sent the error status message to the sessiond. | |
ffe60014 | 1609 | */ |
f2a444f1 | 1610 | goto end_nosignal; |
ffe60014 DG |
1611 | } |
1612 | /* | |
1613 | * The communicaton was broken hence there is a bad state between | |
1614 | * the consumer and sessiond so stop everything. | |
1615 | */ | |
1616 | goto error_fatal; | |
1617 | } | |
1618 | ||
9ce5646a MD |
1619 | health_code_update(); |
1620 | ||
10a50311 JD |
1621 | /* |
1622 | * In no monitor mode, the streams ownership is kept inside the channel | |
1623 | * so don't send them to the data thread. | |
1624 | */ | |
1625 | if (!channel->monitor) { | |
1626 | goto end_msg_sessiond; | |
1627 | } | |
1628 | ||
d88aee68 DG |
1629 | ret = send_streams_to_thread(channel, ctx); |
1630 | if (ret < 0) { | |
1631 | /* | |
1632 | * If we are unable to send the stream to the thread, there is | |
1633 | * a big problem so just stop everything. | |
1634 | */ | |
1635 | goto error_fatal; | |
ffe60014 | 1636 | } |
ffe60014 DG |
1637 | /* List MUST be empty after or else it could be reused. */ |
1638 | assert(cds_list_empty(&channel->streams.head)); | |
d88aee68 DG |
1639 | goto end_msg_sessiond; |
1640 | } | |
1641 | case LTTNG_CONSUMER_DESTROY_CHANNEL: | |
1642 | { | |
1643 | uint64_t key = msg.u.destroy_channel.key; | |
d88aee68 | 1644 | |
a0cbdd2e MD |
1645 | /* |
1646 | * Only called if streams have not been sent to stream | |
1647 | * manager thread. However, channel has been sent to | |
1648 | * channel manager thread. | |
1649 | */ | |
1650 | notify_thread_del_channel(ctx, key); | |
d88aee68 | 1651 | goto end_msg_sessiond; |
ffe60014 | 1652 | } |
d88aee68 DG |
1653 | case LTTNG_CONSUMER_CLOSE_METADATA: |
1654 | { | |
1655 | int ret; | |
1656 | ||
1657 | ret = close_metadata(msg.u.close_metadata.key); | |
1658 | if (ret != 0) { | |
1659 | ret_code = ret; | |
1660 | } | |
1661 | ||
1662 | goto end_msg_sessiond; | |
1663 | } | |
7972aab2 DG |
1664 | case LTTNG_CONSUMER_FLUSH_CHANNEL: |
1665 | { | |
1666 | int ret; | |
1667 | ||
1668 | ret = flush_channel(msg.u.flush_channel.key); | |
1669 | if (ret != 0) { | |
1670 | ret_code = ret; | |
1671 | } | |
1672 | ||
1673 | goto end_msg_sessiond; | |
1674 | } | |
0dd01979 MD |
1675 | case LTTNG_CONSUMER_CLEAR_QUIESCENT_CHANNEL: |
1676 | { | |
1677 | int ret; | |
1678 | ||
1679 | ret = clear_quiescent_channel( | |
1680 | msg.u.clear_quiescent_channel.key); | |
1681 | if (ret != 0) { | |
1682 | ret_code = ret; | |
1683 | } | |
1684 | ||
1685 | goto end_msg_sessiond; | |
1686 | } | |
d88aee68 | 1687 | case LTTNG_CONSUMER_PUSH_METADATA: |
ffe60014 DG |
1688 | { |
1689 | int ret; | |
d88aee68 | 1690 | uint64_t len = msg.u.push_metadata.len; |
d88aee68 | 1691 | uint64_t key = msg.u.push_metadata.key; |
331744e3 | 1692 | uint64_t offset = msg.u.push_metadata.target_offset; |
93ec662e | 1693 | uint64_t version = msg.u.push_metadata.version; |
ffe60014 DG |
1694 | struct lttng_consumer_channel *channel; |
1695 | ||
8fd623e0 DG |
1696 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, |
1697 | len); | |
ffe60014 DG |
1698 | |
1699 | channel = consumer_find_channel(key); | |
1700 | if (!channel) { | |
000baf6a DG |
1701 | /* |
1702 | * This is possible if the metadata creation on the consumer side | |
1703 | * is in flight vis-a-vis a concurrent push metadata from the | |
1704 | * session daemon. Simply return that the channel failed and the | |
1705 | * session daemon will handle that message correctly considering | |
1706 | * that this race is acceptable thus the DBG() statement here. | |
1707 | */ | |
1708 | DBG("UST consumer push metadata %" PRIu64 " not found", key); | |
1709 | ret_code = LTTCOMM_CONSUMERD_CHANNEL_FAIL; | |
4a2eb0ca | 1710 | goto end_msg_sessiond; |
d88aee68 DG |
1711 | } |
1712 | ||
9ce5646a MD |
1713 | health_code_update(); |
1714 | ||
c585821b MD |
1715 | if (!len) { |
1716 | /* | |
1717 | * There is nothing to receive. We have simply | |
1718 | * checked whether the channel can be found. | |
1719 | */ | |
1720 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1721 | goto end_msg_sessiond; | |
1722 | } | |
1723 | ||
d88aee68 | 1724 | /* Tell session daemon we are ready to receive the metadata. */ |
0c759fc9 | 1725 | ret = consumer_send_status_msg(sock, LTTCOMM_CONSUMERD_SUCCESS); |
ffe60014 DG |
1726 | if (ret < 0) { |
1727 | /* Somehow, the session daemon is not responding anymore. */ | |
d88aee68 DG |
1728 | goto error_fatal; |
1729 | } | |
1730 | ||
9ce5646a MD |
1731 | health_code_update(); |
1732 | ||
d88aee68 | 1733 | /* Wait for more data. */ |
9ce5646a MD |
1734 | health_poll_entry(); |
1735 | ret = lttng_consumer_poll_socket(consumer_sockpoll); | |
1736 | health_poll_exit(); | |
84382d49 | 1737 | if (ret) { |
489f70e9 | 1738 | goto error_fatal; |
d88aee68 DG |
1739 | } |
1740 | ||
9ce5646a MD |
1741 | health_code_update(); |
1742 | ||
331744e3 | 1743 | ret = lttng_ustconsumer_recv_metadata(sock, key, offset, |
93ec662e | 1744 | len, version, channel, 0, 1); |
d88aee68 | 1745 | if (ret < 0) { |
331744e3 | 1746 | /* error receiving from sessiond */ |
489f70e9 | 1747 | goto error_fatal; |
331744e3 JD |
1748 | } else { |
1749 | ret_code = ret; | |
d88aee68 DG |
1750 | goto end_msg_sessiond; |
1751 | } | |
d88aee68 DG |
1752 | } |
1753 | case LTTNG_CONSUMER_SETUP_METADATA: | |
1754 | { | |
1755 | int ret; | |
1756 | ||
1757 | ret = setup_metadata(ctx, msg.u.setup_metadata.key); | |
1758 | if (ret) { | |
1759 | ret_code = ret; | |
1760 | } | |
1761 | goto end_msg_sessiond; | |
ffe60014 | 1762 | } |
6dc3064a DG |
1763 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
1764 | { | |
b0226bd4 MD |
1765 | struct lttng_consumer_channel *channel; |
1766 | uint64_t key = msg.u.snapshot_channel.key; | |
1767 | ||
1768 | channel = consumer_find_channel(key); | |
1769 | if (!channel) { | |
1770 | DBG("UST snapshot channel not found for key %" PRIu64, key); | |
1771 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
10a50311 | 1772 | } else { |
b0226bd4 MD |
1773 | if (msg.u.snapshot_channel.metadata) { |
1774 | ret = snapshot_metadata(channel, key, | |
1775 | msg.u.snapshot_channel.pathname, | |
1776 | msg.u.snapshot_channel.relayd_id, | |
e5148e25 | 1777 | ctx); |
b0226bd4 MD |
1778 | if (ret < 0) { |
1779 | ERR("Snapshot metadata failed"); | |
1780 | ret_code = LTTCOMM_CONSUMERD_SNAPSHOT_FAILED; | |
1781 | } | |
1782 | } else { | |
1783 | ret = snapshot_channel(channel, key, | |
1784 | msg.u.snapshot_channel.pathname, | |
1785 | msg.u.snapshot_channel.relayd_id, | |
1786 | msg.u.snapshot_channel.nb_packets_per_stream, | |
1787 | ctx); | |
1788 | if (ret < 0) { | |
1789 | ERR("Snapshot channel failed"); | |
1790 | ret_code = LTTCOMM_CONSUMERD_SNAPSHOT_FAILED; | |
1791 | } | |
10a50311 JD |
1792 | } |
1793 | } | |
9ce5646a | 1794 | health_code_update(); |
6dc3064a DG |
1795 | ret = consumer_send_status_msg(sock, ret_code); |
1796 | if (ret < 0) { | |
1797 | /* Somehow, the session daemon is not responding anymore. */ | |
1798 | goto end_nosignal; | |
1799 | } | |
9ce5646a | 1800 | health_code_update(); |
6dc3064a DG |
1801 | break; |
1802 | } | |
fb83fe64 JD |
1803 | case LTTNG_CONSUMER_DISCARDED_EVENTS: |
1804 | { | |
beb59458 MJ |
1805 | int ret = 0; |
1806 | uint64_t discarded_events; | |
fb83fe64 JD |
1807 | struct lttng_ht_iter iter; |
1808 | struct lttng_ht *ht; | |
1809 | struct lttng_consumer_stream *stream; | |
1810 | uint64_t id = msg.u.discarded_events.session_id; | |
1811 | uint64_t key = msg.u.discarded_events.channel_key; | |
1812 | ||
1813 | DBG("UST consumer discarded events command for session id %" | |
1814 | PRIu64, id); | |
1815 | rcu_read_lock(); | |
1816 | pthread_mutex_lock(&consumer_data.lock); | |
1817 | ||
1818 | ht = consumer_data.stream_list_ht; | |
1819 | ||
1820 | /* | |
1821 | * We only need a reference to the channel, but they are not | |
1822 | * directly indexed, so we just use the first matching stream | |
1823 | * to extract the information we need, we default to 0 if not | |
1824 | * found (no events are dropped if the channel is not yet in | |
1825 | * use). | |
1826 | */ | |
beb59458 | 1827 | discarded_events = 0; |
fb83fe64 JD |
1828 | cds_lfht_for_each_entry_duplicate(ht->ht, |
1829 | ht->hash_fct(&id, lttng_ht_seed), | |
1830 | ht->match_fct, &id, | |
1831 | &iter.iter, stream, node_session_id.node) { | |
1832 | if (stream->chan->key == key) { | |
beb59458 | 1833 | discarded_events = stream->chan->discarded_events; |
fb83fe64 JD |
1834 | break; |
1835 | } | |
1836 | } | |
1837 | pthread_mutex_unlock(&consumer_data.lock); | |
1838 | rcu_read_unlock(); | |
1839 | ||
1840 | DBG("UST consumer discarded events command for session id %" | |
1841 | PRIu64 ", channel key %" PRIu64, id, key); | |
1842 | ||
1843 | health_code_update(); | |
1844 | ||
1845 | /* Send back returned value to session daemon */ | |
beb59458 | 1846 | ret = lttcomm_send_unix_sock(sock, &discarded_events, sizeof(discarded_events)); |
fb83fe64 JD |
1847 | if (ret < 0) { |
1848 | PERROR("send discarded events"); | |
1849 | goto error_fatal; | |
1850 | } | |
1851 | ||
1852 | break; | |
1853 | } | |
1854 | case LTTNG_CONSUMER_LOST_PACKETS: | |
1855 | { | |
9a06e8d4 JG |
1856 | int ret; |
1857 | uint64_t lost_packets; | |
fb83fe64 JD |
1858 | struct lttng_ht_iter iter; |
1859 | struct lttng_ht *ht; | |
1860 | struct lttng_consumer_stream *stream; | |
1861 | uint64_t id = msg.u.lost_packets.session_id; | |
1862 | uint64_t key = msg.u.lost_packets.channel_key; | |
1863 | ||
1864 | DBG("UST consumer lost packets command for session id %" | |
1865 | PRIu64, id); | |
1866 | rcu_read_lock(); | |
1867 | pthread_mutex_lock(&consumer_data.lock); | |
1868 | ||
1869 | ht = consumer_data.stream_list_ht; | |
1870 | ||
1871 | /* | |
1872 | * We only need a reference to the channel, but they are not | |
1873 | * directly indexed, so we just use the first matching stream | |
1874 | * to extract the information we need, we default to 0 if not | |
1875 | * found (no packets lost if the channel is not yet in use). | |
1876 | */ | |
9a06e8d4 | 1877 | lost_packets = 0; |
fb83fe64 JD |
1878 | cds_lfht_for_each_entry_duplicate(ht->ht, |
1879 | ht->hash_fct(&id, lttng_ht_seed), | |
1880 | ht->match_fct, &id, | |
1881 | &iter.iter, stream, node_session_id.node) { | |
1882 | if (stream->chan->key == key) { | |
9a06e8d4 | 1883 | lost_packets = stream->chan->lost_packets; |
fb83fe64 JD |
1884 | break; |
1885 | } | |
1886 | } | |
1887 | pthread_mutex_unlock(&consumer_data.lock); | |
1888 | rcu_read_unlock(); | |
1889 | ||
1890 | DBG("UST consumer lost packets command for session id %" | |
1891 | PRIu64 ", channel key %" PRIu64, id, key); | |
1892 | ||
1893 | health_code_update(); | |
1894 | ||
1895 | /* Send back returned value to session daemon */ | |
9a06e8d4 JG |
1896 | ret = lttcomm_send_unix_sock(sock, &lost_packets, |
1897 | sizeof(lost_packets)); | |
fb83fe64 JD |
1898 | if (ret < 0) { |
1899 | PERROR("send lost packets"); | |
1900 | goto error_fatal; | |
1901 | } | |
1902 | ||
1903 | break; | |
1904 | } | |
b3530820 JG |
1905 | case LTTNG_CONSUMER_SET_CHANNEL_MONITOR_PIPE: |
1906 | { | |
1907 | int channel_monitor_pipe; | |
1908 | ||
1909 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1910 | /* Successfully received the command's type. */ | |
1911 | ret = consumer_send_status_msg(sock, ret_code); | |
1912 | if (ret < 0) { | |
1913 | goto error_fatal; | |
1914 | } | |
1915 | ||
1916 | ret = lttcomm_recv_fds_unix_sock(sock, &channel_monitor_pipe, | |
1917 | 1); | |
1918 | if (ret != sizeof(channel_monitor_pipe)) { | |
1919 | ERR("Failed to receive channel monitor pipe"); | |
1920 | goto error_fatal; | |
1921 | } | |
1922 | ||
1923 | DBG("Received channel monitor pipe (%d)", channel_monitor_pipe); | |
1924 | ret = consumer_timer_thread_set_channel_monitor_pipe( | |
1925 | channel_monitor_pipe); | |
1926 | if (!ret) { | |
1927 | int flags; | |
1928 | ||
1929 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1930 | /* Set the pipe as non-blocking. */ | |
1931 | ret = fcntl(channel_monitor_pipe, F_GETFL, 0); | |
1932 | if (ret == -1) { | |
1933 | PERROR("fcntl get flags of the channel monitoring pipe"); | |
1934 | goto error_fatal; | |
1935 | } | |
1936 | flags = ret; | |
1937 | ||
1938 | ret = fcntl(channel_monitor_pipe, F_SETFL, | |
1939 | flags | O_NONBLOCK); | |
1940 | if (ret == -1) { | |
1941 | PERROR("fcntl set O_NONBLOCK flag of the channel monitoring pipe"); | |
1942 | goto error_fatal; | |
1943 | } | |
1944 | DBG("Channel monitor pipe set as non-blocking"); | |
1945 | } else { | |
1946 | ret_code = LTTCOMM_CONSUMERD_ALREADY_SET; | |
1947 | } | |
1948 | goto end_msg_sessiond; | |
1949 | } | |
b99a8d42 JD |
1950 | case LTTNG_CONSUMER_ROTATE_CHANNEL: |
1951 | { | |
e96d66b4 MD |
1952 | struct lttng_consumer_channel *channel; |
1953 | uint64_t key = msg.u.rotate_channel.key; | |
b99a8d42 | 1954 | |
e96d66b4 MD |
1955 | channel = consumer_find_channel(key); |
1956 | if (!channel) { | |
1957 | DBG("Channel %" PRIu64 " not found", key); | |
1958 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
1959 | } else { | |
1960 | /* | |
1961 | * Sample the rotate position of all the streams in | |
1962 | * this channel. | |
1963 | */ | |
1964 | ret = lttng_consumer_rotate_channel(channel, key, | |
e96d66b4 MD |
1965 | msg.u.rotate_channel.relayd_id, |
1966 | msg.u.rotate_channel.metadata, | |
e96d66b4 MD |
1967 | ctx); |
1968 | if (ret < 0) { | |
1969 | ERR("Rotate channel failed"); | |
1970 | ret_code = LTTCOMM_CONSUMERD_ROTATION_FAIL; | |
1971 | } | |
b99a8d42 | 1972 | |
e96d66b4 MD |
1973 | health_code_update(); |
1974 | } | |
b99a8d42 JD |
1975 | ret = consumer_send_status_msg(sock, ret_code); |
1976 | if (ret < 0) { | |
1977 | /* Somehow, the session daemon is not responding anymore. */ | |
1978 | goto end_nosignal; | |
1979 | } | |
1980 | ||
1981 | /* | |
1982 | * Rotate the streams that are ready right now. | |
1983 | * FIXME: this is a second consecutive iteration over the | |
1984 | * streams in a channel, there is probably a better way to | |
1985 | * handle this, but it needs to be after the | |
1986 | * consumer_send_status_msg() call. | |
1987 | */ | |
e96d66b4 MD |
1988 | if (channel) { |
1989 | ret = lttng_consumer_rotate_ready_streams( | |
1990 | channel, key, ctx); | |
1991 | if (ret < 0) { | |
1992 | ERR("Rotate channel failed"); | |
1993 | } | |
b99a8d42 JD |
1994 | } |
1995 | break; | |
1996 | } | |
e5148e25 | 1997 | case LTTNG_CONSUMER_INIT: |
00fb02ac | 1998 | { |
e5148e25 JG |
1999 | ret_code = lttng_consumer_init_command(ctx, |
2000 | msg.u.init.sessiond_uuid); | |
d88744a4 | 2001 | health_code_update(); |
d88744a4 JD |
2002 | ret = consumer_send_status_msg(sock, ret_code); |
2003 | if (ret < 0) { | |
2004 | /* Somehow, the session daemon is not responding anymore. */ | |
2005 | goto end_nosignal; | |
2006 | } | |
2007 | break; | |
2008 | } | |
e5148e25 | 2009 | case LTTNG_CONSUMER_CREATE_TRACE_CHUNK: |
d88744a4 | 2010 | { |
e5148e25 | 2011 | const struct lttng_credentials credentials = { |
0ebdafe0 JG |
2012 | .uid = msg.u.create_trace_chunk.credentials.value.uid, |
2013 | .gid = msg.u.create_trace_chunk.credentials.value.gid, | |
e5148e25 JG |
2014 | }; |
2015 | const bool is_local_trace = | |
2016 | !msg.u.create_trace_chunk.relayd_id.is_set; | |
2017 | const uint64_t relayd_id = | |
2018 | msg.u.create_trace_chunk.relayd_id.value; | |
2019 | const char *chunk_override_name = | |
2020 | *msg.u.create_trace_chunk.override_name ? | |
2021 | msg.u.create_trace_chunk.override_name : | |
2022 | NULL; | |
2023 | LTTNG_OPTIONAL(struct lttng_directory_handle) chunk_directory_handle = | |
2024 | LTTNG_OPTIONAL_INIT; | |
d88744a4 | 2025 | |
e5148e25 JG |
2026 | /* |
2027 | * The session daemon will only provide a chunk directory file | |
2028 | * descriptor for local traces. | |
2029 | */ | |
2030 | if (is_local_trace) { | |
2031 | int chunk_dirfd; | |
19990ed5 | 2032 | |
e5148e25 JG |
2033 | /* Acnowledge the reception of the command. */ |
2034 | ret = consumer_send_status_msg(sock, | |
2035 | LTTCOMM_CONSUMERD_SUCCESS); | |
2036 | if (ret < 0) { | |
2037 | /* Somehow, the session daemon is not responding anymore. */ | |
2038 | goto end_nosignal; | |
2039 | } | |
82528808 | 2040 | |
e5148e25 JG |
2041 | ret = lttcomm_recv_fds_unix_sock(sock, &chunk_dirfd, 1); |
2042 | if (ret != sizeof(chunk_dirfd)) { | |
2043 | ERR("Failed to receive trace chunk directory file descriptor"); | |
2044 | goto error_fatal; | |
2045 | } | |
82528808 | 2046 | |
e5148e25 JG |
2047 | DBG("Received trace chunk directory fd (%d)", |
2048 | chunk_dirfd); | |
2049 | ret = lttng_directory_handle_init_from_dirfd( | |
2050 | &chunk_directory_handle.value, | |
2051 | chunk_dirfd); | |
2052 | if (ret) { | |
2053 | ERR("Failed to initialize chunk directory handle from directory file descriptor"); | |
2054 | if (close(chunk_dirfd)) { | |
2055 | PERROR("Failed to close chunk directory file descriptor"); | |
2056 | } | |
2057 | goto error_fatal; | |
2058 | } | |
2059 | chunk_directory_handle.is_set = true; | |
82528808 JG |
2060 | } |
2061 | ||
e5148e25 JG |
2062 | ret_code = lttng_consumer_create_trace_chunk( |
2063 | !is_local_trace ? &relayd_id : NULL, | |
2064 | msg.u.create_trace_chunk.session_id, | |
2065 | msg.u.create_trace_chunk.chunk_id, | |
0ebdafe0 JG |
2066 | (time_t) msg.u.create_trace_chunk |
2067 | .creation_timestamp, | |
e5148e25 | 2068 | chunk_override_name, |
0ebdafe0 JG |
2069 | msg.u.create_trace_chunk.credentials.is_set ? |
2070 | &credentials : | |
2071 | NULL, | |
e5148e25 JG |
2072 | chunk_directory_handle.is_set ? |
2073 | &chunk_directory_handle.value : | |
2074 | NULL); | |
82528808 | 2075 | |
e5148e25 JG |
2076 | if (chunk_directory_handle.is_set) { |
2077 | lttng_directory_handle_fini( | |
2078 | &chunk_directory_handle.value); | |
d88744a4 | 2079 | } |
e5148e25 | 2080 | goto end_msg_sessiond; |
00fb02ac | 2081 | } |
e5148e25 | 2082 | case LTTNG_CONSUMER_CLOSE_TRACE_CHUNK: |
a1ae2ea5 | 2083 | { |
6bbcff33 JG |
2084 | enum lttng_trace_chunk_command_type close_command = |
2085 | msg.u.close_trace_chunk.close_command.value; | |
e5148e25 JG |
2086 | const uint64_t relayd_id = |
2087 | msg.u.close_trace_chunk.relayd_id.value; | |
2088 | ||
2089 | ret_code = lttng_consumer_close_trace_chunk( | |
2090 | msg.u.close_trace_chunk.relayd_id.is_set ? | |
6bbcff33 JG |
2091 | &relayd_id : |
2092 | NULL, | |
e5148e25 JG |
2093 | msg.u.close_trace_chunk.session_id, |
2094 | msg.u.close_trace_chunk.chunk_id, | |
6bbcff33 JG |
2095 | (time_t) msg.u.close_trace_chunk.close_timestamp, |
2096 | msg.u.close_trace_chunk.close_command.is_set ? | |
2097 | &close_command : | |
2098 | NULL); | |
e5148e25 | 2099 | goto end_msg_sessiond; |
a1ae2ea5 | 2100 | } |
e5148e25 | 2101 | case LTTNG_CONSUMER_TRACE_CHUNK_EXISTS: |
fc181d72 | 2102 | { |
e5148e25 JG |
2103 | const uint64_t relayd_id = |
2104 | msg.u.trace_chunk_exists.relayd_id.value; | |
2105 | ||
2106 | ret_code = lttng_consumer_trace_chunk_exists( | |
2107 | msg.u.trace_chunk_exists.relayd_id.is_set ? | |
2108 | &relayd_id : NULL, | |
2109 | msg.u.trace_chunk_exists.session_id, | |
2110 | msg.u.trace_chunk_exists.chunk_id); | |
2111 | goto end_msg_sessiond; | |
fc181d72 | 2112 | } |
3bd1e081 MD |
2113 | default: |
2114 | break; | |
2115 | } | |
3f8e211f | 2116 | |
3bd1e081 | 2117 | end_nosignal: |
b0b335c8 | 2118 | rcu_read_unlock(); |
4cbc1a04 | 2119 | |
9ce5646a MD |
2120 | health_code_update(); |
2121 | ||
4cbc1a04 DG |
2122 | /* |
2123 | * Return 1 to indicate success since the 0 value can be a socket | |
2124 | * shutdown during the recv() or send() call. | |
2125 | */ | |
2126 | return 1; | |
ffe60014 DG |
2127 | |
2128 | end_msg_sessiond: | |
2129 | /* | |
2130 | * The returned value here is not useful since either way we'll return 1 to | |
2131 | * the caller because the session daemon socket management is done | |
2132 | * elsewhere. Returning a negative code or 0 will shutdown the consumer. | |
2133 | */ | |
489f70e9 MD |
2134 | ret = consumer_send_status_msg(sock, ret_code); |
2135 | if (ret < 0) { | |
2136 | goto error_fatal; | |
2137 | } | |
ffe60014 | 2138 | rcu_read_unlock(); |
9ce5646a MD |
2139 | |
2140 | health_code_update(); | |
2141 | ||
ffe60014 DG |
2142 | return 1; |
2143 | end_channel_error: | |
2144 | if (channel) { | |
e5148e25 | 2145 | pthread_mutex_unlock(&channel->lock); |
ffe60014 DG |
2146 | /* |
2147 | * Free channel here since no one has a reference to it. We don't | |
2148 | * free after that because a stream can store this pointer. | |
2149 | */ | |
2150 | destroy_channel(channel); | |
2151 | } | |
2152 | /* We have to send a status channel message indicating an error. */ | |
2153 | ret = consumer_send_status_channel(sock, NULL); | |
2154 | if (ret < 0) { | |
2155 | /* Stop everything if session daemon can not be notified. */ | |
2156 | goto error_fatal; | |
2157 | } | |
2158 | rcu_read_unlock(); | |
9ce5646a MD |
2159 | |
2160 | health_code_update(); | |
2161 | ||
ffe60014 DG |
2162 | return 1; |
2163 | error_fatal: | |
2164 | rcu_read_unlock(); | |
2165 | /* This will issue a consumer stop. */ | |
2166 | return -1; | |
3bd1e081 MD |
2167 | } |
2168 | ||
ffe60014 DG |
2169 | /* |
2170 | * Wrapper over the mmap() read offset from ust-ctl library. Since this can be | |
2171 | * compiled out, we isolate it in this library. | |
2172 | */ | |
2173 | int lttng_ustctl_get_mmap_read_offset(struct lttng_consumer_stream *stream, | |
2174 | unsigned long *off) | |
3bd1e081 | 2175 | { |
ffe60014 DG |
2176 | assert(stream); |
2177 | assert(stream->ustream); | |
b5c5fc29 | 2178 | |
ffe60014 | 2179 | return ustctl_get_mmap_read_offset(stream->ustream, off); |
3bd1e081 MD |
2180 | } |
2181 | ||
ffe60014 DG |
2182 | /* |
2183 | * Wrapper over the mmap() read offset from ust-ctl library. Since this can be | |
2184 | * compiled out, we isolate it in this library. | |
2185 | */ | |
2186 | void *lttng_ustctl_get_mmap_base(struct lttng_consumer_stream *stream) | |
d056b477 | 2187 | { |
ffe60014 DG |
2188 | assert(stream); |
2189 | assert(stream->ustream); | |
2190 | ||
2191 | return ustctl_get_mmap_base(stream->ustream); | |
d056b477 MD |
2192 | } |
2193 | ||
fc6d7a51 JD |
2194 | void lttng_ustctl_flush_buffer(struct lttng_consumer_stream *stream, |
2195 | int producer_active) | |
2196 | { | |
2197 | assert(stream); | |
2198 | assert(stream->ustream); | |
2199 | ||
2200 | ustctl_flush_buffer(stream->ustream, producer_active); | |
2201 | } | |
2202 | ||
ffe60014 | 2203 | /* |
e9404c27 | 2204 | * Take a snapshot for a specific stream. |
ffe60014 DG |
2205 | * |
2206 | * Returns 0 on success, < 0 on error | |
2207 | */ | |
2208 | int lttng_ustconsumer_take_snapshot(struct lttng_consumer_stream *stream) | |
3bd1e081 | 2209 | { |
ffe60014 DG |
2210 | assert(stream); |
2211 | assert(stream->ustream); | |
2212 | ||
2213 | return ustctl_snapshot(stream->ustream); | |
3bd1e081 MD |
2214 | } |
2215 | ||
e9404c27 JG |
2216 | /* |
2217 | * Sample consumed and produced positions for a specific stream. | |
2218 | * | |
2219 | * Returns 0 on success, < 0 on error. | |
2220 | */ | |
2221 | int lttng_ustconsumer_sample_snapshot_positions( | |
2222 | struct lttng_consumer_stream *stream) | |
2223 | { | |
2224 | assert(stream); | |
2225 | assert(stream->ustream); | |
2226 | ||
2227 | return ustctl_snapshot_sample_positions(stream->ustream); | |
2228 | } | |
2229 | ||
ffe60014 DG |
2230 | /* |
2231 | * Get the produced position | |
2232 | * | |
2233 | * Returns 0 on success, < 0 on error | |
2234 | */ | |
2235 | int lttng_ustconsumer_get_produced_snapshot( | |
2236 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
3bd1e081 | 2237 | { |
ffe60014 DG |
2238 | assert(stream); |
2239 | assert(stream->ustream); | |
2240 | assert(pos); | |
7a57cf92 | 2241 | |
ffe60014 DG |
2242 | return ustctl_snapshot_get_produced(stream->ustream, pos); |
2243 | } | |
7a57cf92 | 2244 | |
10a50311 JD |
2245 | /* |
2246 | * Get the consumed position | |
2247 | * | |
2248 | * Returns 0 on success, < 0 on error | |
2249 | */ | |
2250 | int lttng_ustconsumer_get_consumed_snapshot( | |
2251 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
2252 | { | |
2253 | assert(stream); | |
2254 | assert(stream->ustream); | |
2255 | assert(pos); | |
2256 | ||
2257 | return ustctl_snapshot_get_consumed(stream->ustream, pos); | |
2258 | } | |
2259 | ||
84a182ce DG |
2260 | void lttng_ustconsumer_flush_buffer(struct lttng_consumer_stream *stream, |
2261 | int producer) | |
2262 | { | |
2263 | assert(stream); | |
2264 | assert(stream->ustream); | |
2265 | ||
2266 | ustctl_flush_buffer(stream->ustream, producer); | |
2267 | } | |
2268 | ||
2269 | int lttng_ustconsumer_get_current_timestamp( | |
2270 | struct lttng_consumer_stream *stream, uint64_t *ts) | |
2271 | { | |
2272 | assert(stream); | |
2273 | assert(stream->ustream); | |
2274 | assert(ts); | |
2275 | ||
2276 | return ustctl_get_current_timestamp(stream->ustream, ts); | |
2277 | } | |
2278 | ||
fb83fe64 JD |
2279 | int lttng_ustconsumer_get_sequence_number( |
2280 | struct lttng_consumer_stream *stream, uint64_t *seq) | |
2281 | { | |
2282 | assert(stream); | |
2283 | assert(stream->ustream); | |
2284 | assert(seq); | |
2285 | ||
2286 | return ustctl_get_sequence_number(stream->ustream, seq); | |
2287 | } | |
2288 | ||
ffe60014 | 2289 | /* |
0dd01979 | 2290 | * Called when the stream signals the consumer that it has hung up. |
ffe60014 DG |
2291 | */ |
2292 | void lttng_ustconsumer_on_stream_hangup(struct lttng_consumer_stream *stream) | |
2293 | { | |
2294 | assert(stream); | |
2295 | assert(stream->ustream); | |
2c1dd183 | 2296 | |
0dd01979 MD |
2297 | pthread_mutex_lock(&stream->lock); |
2298 | if (!stream->quiescent) { | |
2299 | ustctl_flush_buffer(stream->ustream, 0); | |
2300 | stream->quiescent = true; | |
2301 | } | |
2302 | pthread_mutex_unlock(&stream->lock); | |
ffe60014 DG |
2303 | stream->hangup_flush_done = 1; |
2304 | } | |
ee77a7b0 | 2305 | |
ffe60014 DG |
2306 | void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan) |
2307 | { | |
4628484a MD |
2308 | int i; |
2309 | ||
ffe60014 DG |
2310 | assert(chan); |
2311 | assert(chan->uchan); | |
e5148e25 | 2312 | assert(chan->buffer_credentials.is_set); |
e316aad5 | 2313 | |
ea88ca2a MD |
2314 | if (chan->switch_timer_enabled == 1) { |
2315 | consumer_timer_switch_stop(chan); | |
2316 | } | |
4628484a MD |
2317 | for (i = 0; i < chan->nr_stream_fds; i++) { |
2318 | int ret; | |
2319 | ||
2320 | ret = close(chan->stream_fds[i]); | |
2321 | if (ret) { | |
2322 | PERROR("close"); | |
2323 | } | |
2324 | if (chan->shm_path[0]) { | |
2325 | char shm_path[PATH_MAX]; | |
2326 | ||
2327 | ret = get_stream_shm_path(shm_path, chan->shm_path, i); | |
2328 | if (ret) { | |
2329 | ERR("Cannot get stream shm path"); | |
2330 | } | |
e5148e25 JG |
2331 | ret = run_as_unlink(shm_path, |
2332 | chan->buffer_credentials.value.uid, | |
2333 | chan->buffer_credentials.value.gid); | |
4628484a | 2334 | if (ret) { |
4628484a MD |
2335 | PERROR("unlink %s", shm_path); |
2336 | } | |
2337 | } | |
2338 | } | |
3bd1e081 MD |
2339 | } |
2340 | ||
b83e03c4 MD |
2341 | void lttng_ustconsumer_free_channel(struct lttng_consumer_channel *chan) |
2342 | { | |
2343 | assert(chan); | |
2344 | assert(chan->uchan); | |
e5148e25 | 2345 | assert(chan->buffer_credentials.is_set); |
b83e03c4 MD |
2346 | |
2347 | consumer_metadata_cache_destroy(chan); | |
2348 | ustctl_destroy_channel(chan->uchan); | |
ea853771 JR |
2349 | /* Try to rmdir all directories under shm_path root. */ |
2350 | if (chan->root_shm_path[0]) { | |
602766ec | 2351 | (void) run_as_rmdir_recursive(chan->root_shm_path, |
e5148e25 | 2352 | chan->buffer_credentials.value.uid, |
58ec7253 MD |
2353 | chan->buffer_credentials.value.gid, |
2354 | LTTNG_DIRECTORY_HANDLE_SKIP_NON_EMPTY_FLAG); | |
ea853771 | 2355 | } |
b83e03c4 MD |
2356 | free(chan->stream_fds); |
2357 | } | |
2358 | ||
3bd1e081 MD |
2359 | void lttng_ustconsumer_del_stream(struct lttng_consumer_stream *stream) |
2360 | { | |
ffe60014 DG |
2361 | assert(stream); |
2362 | assert(stream->ustream); | |
d41f73b7 | 2363 | |
ea88ca2a MD |
2364 | if (stream->chan->switch_timer_enabled == 1) { |
2365 | consumer_timer_switch_stop(stream->chan); | |
2366 | } | |
ffe60014 DG |
2367 | ustctl_destroy_stream(stream->ustream); |
2368 | } | |
d41f73b7 | 2369 | |
6d574024 DG |
2370 | int lttng_ustconsumer_get_wakeup_fd(struct lttng_consumer_stream *stream) |
2371 | { | |
2372 | assert(stream); | |
2373 | assert(stream->ustream); | |
2374 | ||
2375 | return ustctl_stream_get_wakeup_fd(stream->ustream); | |
2376 | } | |
2377 | ||
2378 | int lttng_ustconsumer_close_wakeup_fd(struct lttng_consumer_stream *stream) | |
2379 | { | |
2380 | assert(stream); | |
2381 | assert(stream->ustream); | |
2382 | ||
2383 | return ustctl_stream_close_wakeup_fd(stream->ustream); | |
2384 | } | |
2385 | ||
309167d2 JD |
2386 | /* |
2387 | * Populate index values of a UST stream. Values are set in big endian order. | |
2388 | * | |
2389 | * Return 0 on success or else a negative value. | |
2390 | */ | |
50adc264 | 2391 | static int get_index_values(struct ctf_packet_index *index, |
309167d2 JD |
2392 | struct ustctl_consumer_stream *ustream) |
2393 | { | |
2394 | int ret; | |
2395 | ||
2396 | ret = ustctl_get_timestamp_begin(ustream, &index->timestamp_begin); | |
2397 | if (ret < 0) { | |
2398 | PERROR("ustctl_get_timestamp_begin"); | |
2399 | goto error; | |
2400 | } | |
2401 | index->timestamp_begin = htobe64(index->timestamp_begin); | |
2402 | ||
2403 | ret = ustctl_get_timestamp_end(ustream, &index->timestamp_end); | |
2404 | if (ret < 0) { | |
2405 | PERROR("ustctl_get_timestamp_end"); | |
2406 | goto error; | |
2407 | } | |
2408 | index->timestamp_end = htobe64(index->timestamp_end); | |
2409 | ||
2410 | ret = ustctl_get_events_discarded(ustream, &index->events_discarded); | |
2411 | if (ret < 0) { | |
2412 | PERROR("ustctl_get_events_discarded"); | |
2413 | goto error; | |
2414 | } | |
2415 | index->events_discarded = htobe64(index->events_discarded); | |
2416 | ||
2417 | ret = ustctl_get_content_size(ustream, &index->content_size); | |
2418 | if (ret < 0) { | |
2419 | PERROR("ustctl_get_content_size"); | |
2420 | goto error; | |
2421 | } | |
2422 | index->content_size = htobe64(index->content_size); | |
2423 | ||
2424 | ret = ustctl_get_packet_size(ustream, &index->packet_size); | |
2425 | if (ret < 0) { | |
2426 | PERROR("ustctl_get_packet_size"); | |
2427 | goto error; | |
2428 | } | |
2429 | index->packet_size = htobe64(index->packet_size); | |
2430 | ||
2431 | ret = ustctl_get_stream_id(ustream, &index->stream_id); | |
2432 | if (ret < 0) { | |
2433 | PERROR("ustctl_get_stream_id"); | |
2434 | goto error; | |
2435 | } | |
2436 | index->stream_id = htobe64(index->stream_id); | |
2437 | ||
234cd636 JD |
2438 | ret = ustctl_get_instance_id(ustream, &index->stream_instance_id); |
2439 | if (ret < 0) { | |
2440 | PERROR("ustctl_get_instance_id"); | |
2441 | goto error; | |
2442 | } | |
2443 | index->stream_instance_id = htobe64(index->stream_instance_id); | |
2444 | ||
2445 | ret = ustctl_get_sequence_number(ustream, &index->packet_seq_num); | |
2446 | if (ret < 0) { | |
2447 | PERROR("ustctl_get_sequence_number"); | |
2448 | goto error; | |
2449 | } | |
2450 | index->packet_seq_num = htobe64(index->packet_seq_num); | |
2451 | ||
309167d2 JD |
2452 | error: |
2453 | return ret; | |
2454 | } | |
2455 | ||
93ec662e JD |
2456 | static |
2457 | void metadata_stream_reset_cache(struct lttng_consumer_stream *stream, | |
2458 | struct consumer_metadata_cache *cache) | |
2459 | { | |
2460 | DBG("Metadata stream update to version %" PRIu64, | |
2461 | cache->version); | |
2462 | stream->ust_metadata_pushed = 0; | |
2463 | stream->metadata_version = cache->version; | |
2464 | stream->reset_metadata_flag = 1; | |
2465 | } | |
2466 | ||
2467 | /* | |
2468 | * Check if the version of the metadata stream and metadata cache match. | |
2469 | * If the cache got updated, reset the metadata stream. | |
2470 | * The stream lock and metadata cache lock MUST be held. | |
2471 | * Return 0 on success, a negative value on error. | |
2472 | */ | |
2473 | static | |
2474 | int metadata_stream_check_version(struct lttng_consumer_stream *stream) | |
2475 | { | |
2476 | int ret = 0; | |
2477 | struct consumer_metadata_cache *cache = stream->chan->metadata_cache; | |
2478 | ||
2479 | if (cache->version == stream->metadata_version) { | |
2480 | goto end; | |
2481 | } | |
2482 | metadata_stream_reset_cache(stream, cache); | |
2483 | ||
2484 | end: | |
2485 | return ret; | |
2486 | } | |
2487 | ||
94d49140 JD |
2488 | /* |
2489 | * Write up to one packet from the metadata cache to the channel. | |
2490 | * | |
2491 | * Returns the number of bytes pushed in the cache, or a negative value | |
2492 | * on error. | |
2493 | */ | |
2494 | static | |
2495 | int commit_one_metadata_packet(struct lttng_consumer_stream *stream) | |
2496 | { | |
2497 | ssize_t write_len; | |
2498 | int ret; | |
2499 | ||
2500 | pthread_mutex_lock(&stream->chan->metadata_cache->lock); | |
93ec662e JD |
2501 | ret = metadata_stream_check_version(stream); |
2502 | if (ret < 0) { | |
2503 | goto end; | |
2504 | } | |
c585821b | 2505 | if (stream->chan->metadata_cache->max_offset |
94d49140 JD |
2506 | == stream->ust_metadata_pushed) { |
2507 | ret = 0; | |
2508 | goto end; | |
2509 | } | |
2510 | ||
2511 | write_len = ustctl_write_one_packet_to_channel(stream->chan->uchan, | |
2512 | &stream->chan->metadata_cache->data[stream->ust_metadata_pushed], | |
c585821b | 2513 | stream->chan->metadata_cache->max_offset |
94d49140 JD |
2514 | - stream->ust_metadata_pushed); |
2515 | assert(write_len != 0); | |
2516 | if (write_len < 0) { | |
2517 | ERR("Writing one metadata packet"); | |
2518 | ret = -1; | |
2519 | goto end; | |
2520 | } | |
2521 | stream->ust_metadata_pushed += write_len; | |
2522 | ||
c585821b | 2523 | assert(stream->chan->metadata_cache->max_offset >= |
94d49140 JD |
2524 | stream->ust_metadata_pushed); |
2525 | ret = write_len; | |
2526 | ||
d367ba54 JG |
2527 | /* |
2528 | * Switch packet (but don't open the next one) on every commit of | |
2529 | * a metadata packet. Since the subbuffer is fully filled (with padding, | |
2530 | * if needed), the stream is "quiescent" after this commit. | |
2531 | */ | |
2532 | ustctl_flush_buffer(stream->ustream, 1); | |
2533 | stream->quiescent = true; | |
94d49140 JD |
2534 | end: |
2535 | pthread_mutex_unlock(&stream->chan->metadata_cache->lock); | |
2536 | return ret; | |
2537 | } | |
2538 | ||
309167d2 | 2539 | |
94d49140 JD |
2540 | /* |
2541 | * Sync metadata meaning request them to the session daemon and snapshot to the | |
2542 | * metadata thread can consumer them. | |
2543 | * | |
c585821b MD |
2544 | * Metadata stream lock is held here, but we need to release it when |
2545 | * interacting with sessiond, else we cause a deadlock with live | |
2546 | * awaiting on metadata to be pushed out. | |
94d49140 JD |
2547 | * |
2548 | * Return 0 if new metadatda is available, EAGAIN if the metadata stream | |
2549 | * is empty or a negative value on error. | |
2550 | */ | |
2551 | int lttng_ustconsumer_sync_metadata(struct lttng_consumer_local_data *ctx, | |
2552 | struct lttng_consumer_stream *metadata) | |
2553 | { | |
2554 | int ret; | |
2555 | int retry = 0; | |
2556 | ||
2557 | assert(ctx); | |
2558 | assert(metadata); | |
2559 | ||
c585821b | 2560 | pthread_mutex_unlock(&metadata->lock); |
94d49140 JD |
2561 | /* |
2562 | * Request metadata from the sessiond, but don't wait for the flush | |
2563 | * because we locked the metadata thread. | |
2564 | */ | |
2565 | ret = lttng_ustconsumer_request_metadata(ctx, metadata->chan, 0, 0); | |
1caeb2eb | 2566 | pthread_mutex_lock(&metadata->lock); |
94d49140 JD |
2567 | if (ret < 0) { |
2568 | goto end; | |
2569 | } | |
2570 | ||
2571 | ret = commit_one_metadata_packet(metadata); | |
2572 | if (ret <= 0) { | |
2573 | goto end; | |
2574 | } else if (ret > 0) { | |
2575 | retry = 1; | |
2576 | } | |
2577 | ||
94d49140 JD |
2578 | ret = ustctl_snapshot(metadata->ustream); |
2579 | if (ret < 0) { | |
2580 | if (errno != EAGAIN) { | |
2581 | ERR("Sync metadata, taking UST snapshot"); | |
2582 | goto end; | |
2583 | } | |
2584 | DBG("No new metadata when syncing them."); | |
2585 | /* No new metadata, exit. */ | |
2586 | ret = ENODATA; | |
2587 | goto end; | |
2588 | } | |
2589 | ||
2590 | /* | |
2591 | * After this flush, we still need to extract metadata. | |
2592 | */ | |
2593 | if (retry) { | |
2594 | ret = EAGAIN; | |
2595 | } | |
2596 | ||
2597 | end: | |
2598 | return ret; | |
2599 | } | |
2600 | ||
02b3d176 DG |
2601 | /* |
2602 | * Return 0 on success else a negative value. | |
2603 | */ | |
2604 | static int notify_if_more_data(struct lttng_consumer_stream *stream, | |
2605 | struct lttng_consumer_local_data *ctx) | |
2606 | { | |
2607 | int ret; | |
2608 | struct ustctl_consumer_stream *ustream; | |
2609 | ||
2610 | assert(stream); | |
2611 | assert(ctx); | |
2612 | ||
2613 | ustream = stream->ustream; | |
2614 | ||
2615 | /* | |
2616 | * First, we are going to check if there is a new subbuffer available | |
2617 | * before reading the stream wait_fd. | |
2618 | */ | |
2619 | /* Get the next subbuffer */ | |
2620 | ret = ustctl_get_next_subbuf(ustream); | |
2621 | if (ret) { | |
2622 | /* No more data found, flag the stream. */ | |
2623 | stream->has_data = 0; | |
2624 | ret = 0; | |
2625 | goto end; | |
2626 | } | |
2627 | ||
5420e5db | 2628 | ret = ustctl_put_subbuf(ustream); |
02b3d176 DG |
2629 | assert(!ret); |
2630 | ||
2631 | /* This stream still has data. Flag it and wake up the data thread. */ | |
2632 | stream->has_data = 1; | |
2633 | ||
2634 | if (stream->monitor && !stream->hangup_flush_done && !ctx->has_wakeup) { | |
2635 | ssize_t writelen; | |
2636 | ||
2637 | writelen = lttng_pipe_write(ctx->consumer_wakeup_pipe, "!", 1); | |
2638 | if (writelen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) { | |
2639 | ret = writelen; | |
2640 | goto end; | |
2641 | } | |
2642 | ||
2643 | /* The wake up pipe has been notified. */ | |
2644 | ctx->has_wakeup = 1; | |
2645 | } | |
2646 | ret = 0; | |
2647 | ||
2648 | end: | |
2649 | return ret; | |
2650 | } | |
2651 | ||
fb83fe64 JD |
2652 | static |
2653 | int update_stream_stats(struct lttng_consumer_stream *stream) | |
2654 | { | |
2655 | int ret; | |
2656 | uint64_t seq, discarded; | |
2657 | ||
2658 | ret = ustctl_get_sequence_number(stream->ustream, &seq); | |
2659 | if (ret < 0) { | |
2660 | PERROR("ustctl_get_sequence_number"); | |
2661 | goto end; | |
2662 | } | |
2663 | /* | |
2664 | * Start the sequence when we extract the first packet in case we don't | |
2665 | * start at 0 (for example if a consumer is not connected to the | |
2666 | * session immediately after the beginning). | |
2667 | */ | |
2668 | if (stream->last_sequence_number == -1ULL) { | |
2669 | stream->last_sequence_number = seq; | |
2670 | } else if (seq > stream->last_sequence_number) { | |
2671 | stream->chan->lost_packets += seq - | |
2672 | stream->last_sequence_number - 1; | |
2673 | } else { | |
2674 | /* seq <= last_sequence_number */ | |
2675 | ERR("Sequence number inconsistent : prev = %" PRIu64 | |
2676 | ", current = %" PRIu64, | |
2677 | stream->last_sequence_number, seq); | |
2678 | ret = -1; | |
2679 | goto end; | |
2680 | } | |
2681 | stream->last_sequence_number = seq; | |
2682 | ||
2683 | ret = ustctl_get_events_discarded(stream->ustream, &discarded); | |
2684 | if (ret < 0) { | |
2685 | PERROR("kernctl_get_events_discarded"); | |
2686 | goto end; | |
2687 | } | |
2688 | if (discarded < stream->last_discarded_events) { | |
2689 | /* | |
83f4233d MJ |
2690 | * Overflow has occurred. We assume only one wrap-around |
2691 | * has occurred. | |
fb83fe64 JD |
2692 | */ |
2693 | stream->chan->discarded_events += | |
2694 | (1ULL << (CAA_BITS_PER_LONG - 1)) - | |
2695 | stream->last_discarded_events + discarded; | |
2696 | } else { | |
2697 | stream->chan->discarded_events += discarded - | |
2698 | stream->last_discarded_events; | |
2699 | } | |
2700 | stream->last_discarded_events = discarded; | |
2701 | ret = 0; | |
2702 | ||
2703 | end: | |
2704 | return ret; | |
2705 | } | |
2706 | ||
94d49140 JD |
2707 | /* |
2708 | * Read subbuffer from the given stream. | |
2709 | * | |
e5148e25 | 2710 | * Stream and channel locks MUST be acquired by the caller. |
94d49140 JD |
2711 | * |
2712 | * Return 0 on success else a negative value. | |
2713 | */ | |
d41f73b7 | 2714 | int lttng_ustconsumer_read_subbuffer(struct lttng_consumer_stream *stream, |
e5148e25 | 2715 | struct lttng_consumer_local_data *ctx) |
d41f73b7 | 2716 | { |
1d4dfdef | 2717 | unsigned long len, subbuf_size, padding; |
02d02e31 | 2718 | int err, write_index = 1, rotation_ret; |
d41f73b7 | 2719 | long ret = 0; |
ffe60014 | 2720 | struct ustctl_consumer_stream *ustream; |
50adc264 | 2721 | struct ctf_packet_index index; |
ffe60014 DG |
2722 | |
2723 | assert(stream); | |
2724 | assert(stream->ustream); | |
2725 | assert(ctx); | |
d41f73b7 | 2726 | |
3eb914c0 | 2727 | DBG("In UST read_subbuffer (wait_fd: %d, name: %s)", stream->wait_fd, |
ffe60014 DG |
2728 | stream->name); |
2729 | ||
2730 | /* Ease our life for what's next. */ | |
2731 | ustream = stream->ustream; | |
d41f73b7 | 2732 | |
6cd525e8 | 2733 | /* |
02b3d176 DG |
2734 | * We can consume the 1 byte written into the wait_fd by UST. Don't trigger |
2735 | * error if we cannot read this one byte (read returns 0), or if the error | |
2736 | * is EAGAIN or EWOULDBLOCK. | |
2737 | * | |
2738 | * This is only done when the stream is monitored by a thread, before the | |
2739 | * flush is done after a hangup and if the stream is not flagged with data | |
2740 | * since there might be nothing to consume in the wait fd but still have | |
2741 | * data available flagged by the consumer wake up pipe. | |
6cd525e8 | 2742 | */ |
02b3d176 DG |
2743 | if (stream->monitor && !stream->hangup_flush_done && !stream->has_data) { |
2744 | char dummy; | |
c617c0c6 MD |
2745 | ssize_t readlen; |
2746 | ||
6cd525e8 MD |
2747 | readlen = lttng_read(stream->wait_fd, &dummy, 1); |
2748 | if (readlen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) { | |
effcf122 | 2749 | ret = readlen; |
02d02e31 JD |
2750 | goto error; |
2751 | } | |
2752 | } | |
2753 | ||
2754 | /* | |
2755 | * If the stream was flagged to be ready for rotation before we extract the | |
2756 | * next packet, rotate it now. | |
2757 | */ | |
2758 | if (stream->rotate_ready) { | |
2759 | DBG("Rotate stream before extracting data"); | |
e5148e25 | 2760 | rotation_ret = lttng_consumer_rotate_stream(ctx, stream); |
02d02e31 JD |
2761 | if (rotation_ret < 0) { |
2762 | ERR("Stream rotation error"); | |
2763 | ret = -1; | |
2764 | goto error; | |
effcf122 | 2765 | } |
d41f73b7 MD |
2766 | } |
2767 | ||
04ef1097 | 2768 | retry: |
d41f73b7 | 2769 | /* Get the next subbuffer */ |
ffe60014 | 2770 | err = ustctl_get_next_subbuf(ustream); |
d41f73b7 | 2771 | if (err != 0) { |
04ef1097 MD |
2772 | /* |
2773 | * Populate metadata info if the existing info has | |
2774 | * already been read. | |
2775 | */ | |
2776 | if (stream->metadata_flag) { | |
94d49140 JD |
2777 | ret = commit_one_metadata_packet(stream); |
2778 | if (ret <= 0) { | |
02d02e31 | 2779 | goto error; |
04ef1097 | 2780 | } |
04ef1097 MD |
2781 | goto retry; |
2782 | } | |
2783 | ||
1d4dfdef | 2784 | ret = err; /* ustctl_get_next_subbuf returns negative, caller expect positive. */ |
d41f73b7 MD |
2785 | /* |
2786 | * This is a debug message even for single-threaded consumer, | |
2787 | * because poll() have more relaxed criterions than get subbuf, | |
2788 | * so get_subbuf may fail for short race windows where poll() | |
2789 | * would issue wakeups. | |
2790 | */ | |
2791 | DBG("Reserving sub buffer failed (everything is normal, " | |
ffe60014 | 2792 | "it is due to concurrency) [ret: %d]", err); |
02d02e31 | 2793 | goto error; |
d41f73b7 | 2794 | } |
ffe60014 | 2795 | assert(stream->chan->output == CONSUMER_CHANNEL_MMAP); |
309167d2 | 2796 | |
1c20f0e2 | 2797 | if (!stream->metadata_flag) { |
309167d2 JD |
2798 | index.offset = htobe64(stream->out_fd_offset); |
2799 | ret = get_index_values(&index, ustream); | |
2800 | if (ret < 0) { | |
7b87473d MD |
2801 | err = ustctl_put_subbuf(ustream); |
2802 | assert(err == 0); | |
02d02e31 | 2803 | goto error; |
309167d2 | 2804 | } |
fb83fe64 JD |
2805 | |
2806 | /* Update the stream's sequence and discarded events count. */ | |
2807 | ret = update_stream_stats(stream); | |
2808 | if (ret < 0) { | |
2809 | PERROR("kernctl_get_events_discarded"); | |
7b87473d MD |
2810 | err = ustctl_put_subbuf(ustream); |
2811 | assert(err == 0); | |
02d02e31 | 2812 | goto error; |
fb83fe64 | 2813 | } |
1c20f0e2 JD |
2814 | } else { |
2815 | write_index = 0; | |
309167d2 JD |
2816 | } |
2817 | ||
1d4dfdef | 2818 | /* Get the full padded subbuffer size */ |
ffe60014 | 2819 | err = ustctl_get_padded_subbuf_size(ustream, &len); |
effcf122 | 2820 | assert(err == 0); |
1d4dfdef DG |
2821 | |
2822 | /* Get subbuffer data size (without padding) */ | |
ffe60014 | 2823 | err = ustctl_get_subbuf_size(ustream, &subbuf_size); |
1d4dfdef DG |
2824 | assert(err == 0); |
2825 | ||
2826 | /* Make sure we don't get a subbuffer size bigger than the padded */ | |
2827 | assert(len >= subbuf_size); | |
2828 | ||
2829 | padding = len - subbuf_size; | |
02d02e31 | 2830 | |
d41f73b7 | 2831 | /* write the subbuffer to the tracefile */ |
309167d2 | 2832 | ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, padding, &index); |
91dfef6e DG |
2833 | /* |
2834 | * The mmap operation should write subbuf_size amount of data when network | |
2835 | * streaming or the full padding (len) size when we are _not_ streaming. | |
2836 | */ | |
d88aee68 DG |
2837 | if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) || |
2838 | (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) { | |
d41f73b7 | 2839 | /* |
91dfef6e | 2840 | * Display the error but continue processing to try to release the |
c5c45efa DG |
2841 | * subbuffer. This is a DBG statement since any unexpected kill or |
2842 | * signal, the application gets unregistered, relayd gets closed or | |
2843 | * anything that affects the buffer lifetime will trigger this error. | |
2844 | * So, for the sake of the user, don't print this error since it can | |
2845 | * happen and it is OK with the code flow. | |
d41f73b7 | 2846 | */ |
c5c45efa | 2847 | DBG("Error writing to tracefile " |
8fd623e0 | 2848 | "(ret: %ld != len: %lu != subbuf_size: %lu)", |
91dfef6e | 2849 | ret, len, subbuf_size); |
309167d2 | 2850 | write_index = 0; |
d41f73b7 | 2851 | } |
ffe60014 | 2852 | err = ustctl_put_next_subbuf(ustream); |
effcf122 | 2853 | assert(err == 0); |
331744e3 | 2854 | |
02b3d176 DG |
2855 | /* |
2856 | * This will consumer the byte on the wait_fd if and only if there is not | |
2857 | * next subbuffer to be acquired. | |
2858 | */ | |
2859 | if (!stream->metadata_flag) { | |
2860 | ret = notify_if_more_data(stream, ctx); | |
2861 | if (ret < 0) { | |
02d02e31 | 2862 | goto error; |
02b3d176 DG |
2863 | } |
2864 | } | |
2865 | ||
309167d2 | 2866 | /* Write index if needed. */ |
1c20f0e2 | 2867 | if (!write_index) { |
02d02e31 | 2868 | goto rotate; |
1c20f0e2 JD |
2869 | } |
2870 | ||
94d49140 JD |
2871 | if (stream->chan->live_timer_interval && !stream->metadata_flag) { |
2872 | /* | |
2873 | * In live, block until all the metadata is sent. | |
2874 | */ | |
c585821b MD |
2875 | pthread_mutex_lock(&stream->metadata_timer_lock); |
2876 | assert(!stream->missed_metadata_flush); | |
2877 | stream->waiting_on_metadata = true; | |
2878 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
2879 | ||
94d49140 | 2880 | err = consumer_stream_sync_metadata(ctx, stream->session_id); |
c585821b MD |
2881 | |
2882 | pthread_mutex_lock(&stream->metadata_timer_lock); | |
2883 | stream->waiting_on_metadata = false; | |
2884 | if (stream->missed_metadata_flush) { | |
2885 | stream->missed_metadata_flush = false; | |
2886 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
2887 | (void) consumer_flush_ust_index(stream); | |
2888 | } else { | |
2889 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
2890 | } | |
2891 | ||
94d49140 | 2892 | if (err < 0) { |
02d02e31 | 2893 | goto error; |
94d49140 JD |
2894 | } |
2895 | } | |
2896 | ||
1c20f0e2 JD |
2897 | assert(!stream->metadata_flag); |
2898 | err = consumer_stream_write_index(stream, &index); | |
2899 | if (err < 0) { | |
02d02e31 | 2900 | goto error; |
309167d2 JD |
2901 | } |
2902 | ||
02d02e31 JD |
2903 | rotate: |
2904 | /* | |
2905 | * After extracting the packet, we check if the stream is now ready to be | |
2906 | * rotated and perform the action immediately. | |
2907 | */ | |
2908 | rotation_ret = lttng_consumer_stream_is_rotate_ready(stream); | |
2909 | if (rotation_ret == 1) { | |
e5148e25 | 2910 | rotation_ret = lttng_consumer_rotate_stream(ctx, stream); |
02d02e31 JD |
2911 | if (rotation_ret < 0) { |
2912 | ERR("Stream rotation error"); | |
2913 | ret = -1; | |
2914 | goto error; | |
2915 | } | |
2916 | } else if (rotation_ret < 0) { | |
2917 | ERR("Checking if stream is ready to rotate"); | |
2918 | ret = -1; | |
2919 | goto error; | |
2920 | } | |
2921 | error: | |
d41f73b7 MD |
2922 | return ret; |
2923 | } | |
2924 | ||
ffe60014 DG |
2925 | /* |
2926 | * Called when a stream is created. | |
fe4477ee JD |
2927 | * |
2928 | * Return 0 on success or else a negative value. | |
ffe60014 | 2929 | */ |
d41f73b7 MD |
2930 | int lttng_ustconsumer_on_recv_stream(struct lttng_consumer_stream *stream) |
2931 | { | |
fe4477ee JD |
2932 | int ret; |
2933 | ||
10a50311 JD |
2934 | assert(stream); |
2935 | ||
e5148e25 JG |
2936 | /* |
2937 | * Don't create anything if this is set for streaming or if there is | |
2938 | * no current trace chunk on the parent channel. | |
2939 | */ | |
2940 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor && | |
2941 | stream->chan->trace_chunk) { | |
2942 | ret = consumer_stream_create_output_files(stream, true); | |
2943 | if (ret) { | |
fe4477ee JD |
2944 | goto error; |
2945 | } | |
fe4477ee JD |
2946 | } |
2947 | ret = 0; | |
2948 | ||
2949 | error: | |
2950 | return ret; | |
d41f73b7 | 2951 | } |
ca22feea DG |
2952 | |
2953 | /* | |
2954 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
2955 | * stream. Consumer data lock MUST be acquired before calling this function |
2956 | * and the stream lock. | |
ca22feea | 2957 | * |
6d805429 | 2958 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
2959 | * data is available for trace viewer reading. |
2960 | */ | |
6d805429 | 2961 | int lttng_ustconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
2962 | { |
2963 | int ret; | |
2964 | ||
2965 | assert(stream); | |
ffe60014 | 2966 | assert(stream->ustream); |
ca22feea | 2967 | |
6d805429 | 2968 | DBG("UST consumer checking data pending"); |
c8f59ee5 | 2969 | |
ca6b395f MD |
2970 | if (stream->endpoint_status != CONSUMER_ENDPOINT_ACTIVE) { |
2971 | ret = 0; | |
2972 | goto end; | |
2973 | } | |
2974 | ||
04ef1097 | 2975 | if (stream->chan->type == CONSUMER_CHANNEL_TYPE_METADATA) { |
e6ee4eab DG |
2976 | uint64_t contiguous, pushed; |
2977 | ||
2978 | /* Ease our life a bit. */ | |
c585821b | 2979 | contiguous = stream->chan->metadata_cache->max_offset; |
e6ee4eab DG |
2980 | pushed = stream->ust_metadata_pushed; |
2981 | ||
04ef1097 MD |
2982 | /* |
2983 | * We can simply check whether all contiguously available data | |
2984 | * has been pushed to the ring buffer, since the push operation | |
2985 | * is performed within get_next_subbuf(), and because both | |
2986 | * get_next_subbuf() and put_next_subbuf() are issued atomically | |
2987 | * thanks to the stream lock within | |
2988 | * lttng_ustconsumer_read_subbuffer(). This basically means that | |
2989 | * whetnever ust_metadata_pushed is incremented, the associated | |
2990 | * metadata has been consumed from the metadata stream. | |
2991 | */ | |
2992 | DBG("UST consumer metadata pending check: contiguous %" PRIu64 " vs pushed %" PRIu64, | |
e6ee4eab | 2993 | contiguous, pushed); |
aa01b94c | 2994 | assert(((int64_t) (contiguous - pushed)) >= 0); |
e6ee4eab | 2995 | if ((contiguous != pushed) || |
6acdf328 | 2996 | (((int64_t) contiguous - pushed) > 0 || contiguous == 0)) { |
04ef1097 MD |
2997 | ret = 1; /* Data is pending */ |
2998 | goto end; | |
2999 | } | |
3000 | } else { | |
3001 | ret = ustctl_get_next_subbuf(stream->ustream); | |
3002 | if (ret == 0) { | |
3003 | /* | |
3004 | * There is still data so let's put back this | |
3005 | * subbuffer. | |
3006 | */ | |
3007 | ret = ustctl_put_subbuf(stream->ustream); | |
3008 | assert(ret == 0); | |
3009 | ret = 1; /* Data is pending */ | |
3010 | goto end; | |
3011 | } | |
ca22feea DG |
3012 | } |
3013 | ||
6d805429 DG |
3014 | /* Data is NOT pending so ready to be read. */ |
3015 | ret = 0; | |
ca22feea | 3016 | |
6efae65e DG |
3017 | end: |
3018 | return ret; | |
ca22feea | 3019 | } |
d88aee68 | 3020 | |
6d574024 DG |
3021 | /* |
3022 | * Stop a given metadata channel timer if enabled and close the wait fd which | |
3023 | * is the poll pipe of the metadata stream. | |
3024 | * | |
3025 | * This MUST be called with the metadata channel acquired. | |
3026 | */ | |
3027 | void lttng_ustconsumer_close_metadata(struct lttng_consumer_channel *metadata) | |
3028 | { | |
3029 | int ret; | |
3030 | ||
3031 | assert(metadata); | |
3032 | assert(metadata->type == CONSUMER_CHANNEL_TYPE_METADATA); | |
3033 | ||
3034 | DBG("Closing metadata channel key %" PRIu64, metadata->key); | |
3035 | ||
3036 | if (metadata->switch_timer_enabled == 1) { | |
3037 | consumer_timer_switch_stop(metadata); | |
3038 | } | |
3039 | ||
3040 | if (!metadata->metadata_stream) { | |
3041 | goto end; | |
3042 | } | |
3043 | ||
3044 | /* | |
3045 | * Closing write side so the thread monitoring the stream wakes up if any | |
3046 | * and clean the metadata stream. | |
3047 | */ | |
3048 | if (metadata->metadata_stream->ust_metadata_poll_pipe[1] >= 0) { | |
3049 | ret = close(metadata->metadata_stream->ust_metadata_poll_pipe[1]); | |
3050 | if (ret < 0) { | |
3051 | PERROR("closing metadata pipe write side"); | |
3052 | } | |
3053 | metadata->metadata_stream->ust_metadata_poll_pipe[1] = -1; | |
3054 | } | |
3055 | ||
3056 | end: | |
3057 | return; | |
3058 | } | |
3059 | ||
d88aee68 DG |
3060 | /* |
3061 | * Close every metadata stream wait fd of the metadata hash table. This | |
3062 | * function MUST be used very carefully so not to run into a race between the | |
3063 | * metadata thread handling streams and this function closing their wait fd. | |
3064 | * | |
3065 | * For UST, this is used when the session daemon hangs up. Its the metadata | |
3066 | * producer so calling this is safe because we are assured that no state change | |
3067 | * can occur in the metadata thread for the streams in the hash table. | |
3068 | */ | |
6d574024 | 3069 | void lttng_ustconsumer_close_all_metadata(struct lttng_ht *metadata_ht) |
d88aee68 | 3070 | { |
d88aee68 DG |
3071 | struct lttng_ht_iter iter; |
3072 | struct lttng_consumer_stream *stream; | |
3073 | ||
3074 | assert(metadata_ht); | |
3075 | assert(metadata_ht->ht); | |
3076 | ||
3077 | DBG("UST consumer closing all metadata streams"); | |
3078 | ||
3079 | rcu_read_lock(); | |
3080 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, | |
3081 | node.node) { | |
9ce5646a MD |
3082 | |
3083 | health_code_update(); | |
3084 | ||
be2b50c7 | 3085 | pthread_mutex_lock(&stream->chan->lock); |
6d574024 | 3086 | lttng_ustconsumer_close_metadata(stream->chan); |
be2b50c7 DG |
3087 | pthread_mutex_unlock(&stream->chan->lock); |
3088 | ||
d88aee68 DG |
3089 | } |
3090 | rcu_read_unlock(); | |
3091 | } | |
d8ef542d MD |
3092 | |
3093 | void lttng_ustconsumer_close_stream_wakeup(struct lttng_consumer_stream *stream) | |
3094 | { | |
3095 | int ret; | |
3096 | ||
3097 | ret = ustctl_stream_close_wakeup_fd(stream->ustream); | |
3098 | if (ret < 0) { | |
3099 | ERR("Unable to close wakeup fd"); | |
3100 | } | |
3101 | } | |
331744e3 | 3102 | |
f666ae70 MD |
3103 | /* |
3104 | * Please refer to consumer-timer.c before adding any lock within this | |
3105 | * function or any of its callees. Timers have a very strict locking | |
3106 | * semantic with respect to teardown. Failure to respect this semantic | |
3107 | * introduces deadlocks. | |
c585821b MD |
3108 | * |
3109 | * DON'T hold the metadata lock when calling this function, else this | |
3110 | * can cause deadlock involving consumer awaiting for metadata to be | |
3111 | * pushed out due to concurrent interaction with the session daemon. | |
f666ae70 | 3112 | */ |
331744e3 | 3113 | int lttng_ustconsumer_request_metadata(struct lttng_consumer_local_data *ctx, |
94d49140 | 3114 | struct lttng_consumer_channel *channel, int timer, int wait) |
331744e3 JD |
3115 | { |
3116 | struct lttcomm_metadata_request_msg request; | |
3117 | struct lttcomm_consumer_msg msg; | |
0c759fc9 | 3118 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
93ec662e | 3119 | uint64_t len, key, offset, version; |
331744e3 JD |
3120 | int ret; |
3121 | ||
3122 | assert(channel); | |
3123 | assert(channel->metadata_cache); | |
3124 | ||
53efb85a MD |
3125 | memset(&request, 0, sizeof(request)); |
3126 | ||
331744e3 JD |
3127 | /* send the metadata request to sessiond */ |
3128 | switch (consumer_data.type) { | |
3129 | case LTTNG_CONSUMER64_UST: | |
3130 | request.bits_per_long = 64; | |
3131 | break; | |
3132 | case LTTNG_CONSUMER32_UST: | |
3133 | request.bits_per_long = 32; | |
3134 | break; | |
3135 | default: | |
3136 | request.bits_per_long = 0; | |
3137 | break; | |
3138 | } | |
3139 | ||
3140 | request.session_id = channel->session_id; | |
1950109e | 3141 | request.session_id_per_pid = channel->session_id_per_pid; |
567eb353 DG |
3142 | /* |
3143 | * Request the application UID here so the metadata of that application can | |
3144 | * be sent back. The channel UID corresponds to the user UID of the session | |
3145 | * used for the rights on the stream file(s). | |
3146 | */ | |
3147 | request.uid = channel->ust_app_uid; | |
331744e3 | 3148 | request.key = channel->key; |
567eb353 | 3149 | |
1950109e | 3150 | DBG("Sending metadata request to sessiond, session id %" PRIu64 |
3e25d926 | 3151 | ", per-pid %" PRIu64 ", app UID %u and channel key %" PRIu64, |
567eb353 DG |
3152 | request.session_id, request.session_id_per_pid, request.uid, |
3153 | request.key); | |
331744e3 | 3154 | |
75d83e50 | 3155 | pthread_mutex_lock(&ctx->metadata_socket_lock); |
9ce5646a MD |
3156 | |
3157 | health_code_update(); | |
3158 | ||
331744e3 JD |
3159 | ret = lttcomm_send_unix_sock(ctx->consumer_metadata_socket, &request, |
3160 | sizeof(request)); | |
3161 | if (ret < 0) { | |
3162 | ERR("Asking metadata to sessiond"); | |
3163 | goto end; | |
3164 | } | |
3165 | ||
9ce5646a MD |
3166 | health_code_update(); |
3167 | ||
331744e3 JD |
3168 | /* Receive the metadata from sessiond */ |
3169 | ret = lttcomm_recv_unix_sock(ctx->consumer_metadata_socket, &msg, | |
3170 | sizeof(msg)); | |
3171 | if (ret != sizeof(msg)) { | |
8fd623e0 | 3172 | DBG("Consumer received unexpected message size %d (expects %zu)", |
331744e3 JD |
3173 | ret, sizeof(msg)); |
3174 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); | |
3175 | /* | |
3176 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
3177 | * since the caller handles this. | |
3178 | */ | |
3179 | goto end; | |
3180 | } | |
3181 | ||
9ce5646a MD |
3182 | health_code_update(); |
3183 | ||
331744e3 JD |
3184 | if (msg.cmd_type == LTTNG_ERR_UND) { |
3185 | /* No registry found */ | |
3186 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, | |
3187 | ret_code); | |
3188 | ret = 0; | |
3189 | goto end; | |
3190 | } else if (msg.cmd_type != LTTNG_CONSUMER_PUSH_METADATA) { | |
3191 | ERR("Unexpected cmd_type received %d", msg.cmd_type); | |
3192 | ret = -1; | |
3193 | goto end; | |
3194 | } | |
3195 | ||
3196 | len = msg.u.push_metadata.len; | |
3197 | key = msg.u.push_metadata.key; | |
3198 | offset = msg.u.push_metadata.target_offset; | |
93ec662e | 3199 | version = msg.u.push_metadata.version; |
331744e3 JD |
3200 | |
3201 | assert(key == channel->key); | |
3202 | if (len == 0) { | |
3203 | DBG("No new metadata to receive for key %" PRIu64, key); | |
3204 | } | |
3205 | ||
9ce5646a MD |
3206 | health_code_update(); |
3207 | ||
331744e3 JD |
3208 | /* Tell session daemon we are ready to receive the metadata. */ |
3209 | ret = consumer_send_status_msg(ctx->consumer_metadata_socket, | |
0c759fc9 | 3210 | LTTCOMM_CONSUMERD_SUCCESS); |
331744e3 JD |
3211 | if (ret < 0 || len == 0) { |
3212 | /* | |
3213 | * Somehow, the session daemon is not responding anymore or there is | |
3214 | * nothing to receive. | |
3215 | */ | |
3216 | goto end; | |
3217 | } | |
3218 | ||
9ce5646a MD |
3219 | health_code_update(); |
3220 | ||
1eb682be | 3221 | ret = lttng_ustconsumer_recv_metadata(ctx->consumer_metadata_socket, |
93ec662e | 3222 | key, offset, len, version, channel, timer, wait); |
1eb682be | 3223 | if (ret >= 0) { |
f2a444f1 DG |
3224 | /* |
3225 | * Only send the status msg if the sessiond is alive meaning a positive | |
3226 | * ret code. | |
3227 | */ | |
1eb682be | 3228 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, ret); |
f2a444f1 | 3229 | } |
331744e3 JD |
3230 | ret = 0; |
3231 | ||
3232 | end: | |
9ce5646a MD |
3233 | health_code_update(); |
3234 | ||
75d83e50 | 3235 | pthread_mutex_unlock(&ctx->metadata_socket_lock); |
331744e3 JD |
3236 | return ret; |
3237 | } | |
70190e1c DG |
3238 | |
3239 | /* | |
3240 | * Return the ustctl call for the get stream id. | |
3241 | */ | |
3242 | int lttng_ustconsumer_get_stream_id(struct lttng_consumer_stream *stream, | |
3243 | uint64_t *stream_id) | |
3244 | { | |
3245 | assert(stream); | |
3246 | assert(stream_id); | |
3247 | ||
3248 | return ustctl_get_stream_id(stream->ustream, stream_id); | |
3249 | } |