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> |
6f1177cf | 36 | #include <stdint.h> |
0857097f | 37 | |
51a9e1c7 | 38 | #include <bin/lttng-consumerd/health-consumerd.h> |
990570ed | 39 | #include <common/common.h> |
10a8a223 | 40 | #include <common/sessiond-comm/sessiond-comm.h> |
00e2e675 | 41 | #include <common/relayd/relayd.h> |
dbb5dfe6 | 42 | #include <common/compat/fcntl.h> |
f263b7fd | 43 | #include <common/compat/endian.h> |
c8fea79c JR |
44 | #include <common/consumer/consumer-metadata-cache.h> |
45 | #include <common/consumer/consumer-stream.h> | |
46 | #include <common/consumer/consumer-timer.h> | |
fe4477ee | 47 | #include <common/utils.h> |
309167d2 | 48 | #include <common/index/index.h> |
6f1177cf | 49 | #include <common/consumer/consumer.h> |
8d18bcae | 50 | #include <common/optional.h> |
10a8a223 DG |
51 | |
52 | #include "ust-consumer.h" | |
3bd1e081 | 53 | |
45863397 | 54 | #define INT_MAX_STR_LEN 12 /* includes \0 */ |
4628484a | 55 | |
3bd1e081 MD |
56 | extern struct lttng_consumer_global_data consumer_data; |
57 | extern int consumer_poll_timeout; | |
3bd1e081 MD |
58 | |
59 | /* | |
ffe60014 DG |
60 | * Free channel object and all streams associated with it. This MUST be used |
61 | * only and only if the channel has _NEVER_ been added to the global channel | |
62 | * hash table. | |
3bd1e081 | 63 | */ |
ffe60014 | 64 | static void destroy_channel(struct lttng_consumer_channel *channel) |
3bd1e081 | 65 | { |
ffe60014 DG |
66 | struct lttng_consumer_stream *stream, *stmp; |
67 | ||
68 | assert(channel); | |
69 | ||
70 | DBG("UST consumer cleaning stream list"); | |
71 | ||
72 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
73 | send_node) { | |
9ce5646a MD |
74 | |
75 | health_code_update(); | |
76 | ||
ffe60014 DG |
77 | cds_list_del(&stream->send_node); |
78 | ustctl_destroy_stream(stream->ustream); | |
e5148e25 | 79 | lttng_trace_chunk_put(stream->trace_chunk); |
ffe60014 DG |
80 | free(stream); |
81 | } | |
82 | ||
83 | /* | |
84 | * If a channel is available meaning that was created before the streams | |
85 | * were, delete it. | |
86 | */ | |
87 | if (channel->uchan) { | |
88 | lttng_ustconsumer_del_channel(channel); | |
b83e03c4 | 89 | lttng_ustconsumer_free_channel(channel); |
ffe60014 DG |
90 | } |
91 | free(channel); | |
92 | } | |
3bd1e081 MD |
93 | |
94 | /* | |
ffe60014 | 95 | * Add channel to internal consumer state. |
3bd1e081 | 96 | * |
ffe60014 | 97 | * Returns 0 on success or else a negative value. |
3bd1e081 | 98 | */ |
ffe60014 DG |
99 | static int add_channel(struct lttng_consumer_channel *channel, |
100 | struct lttng_consumer_local_data *ctx) | |
3bd1e081 MD |
101 | { |
102 | int ret = 0; | |
103 | ||
ffe60014 DG |
104 | assert(channel); |
105 | assert(ctx); | |
106 | ||
107 | if (ctx->on_recv_channel != NULL) { | |
108 | ret = ctx->on_recv_channel(channel); | |
109 | if (ret == 0) { | |
d8ef542d | 110 | ret = consumer_add_channel(channel, ctx); |
ffe60014 DG |
111 | } else if (ret < 0) { |
112 | /* Most likely an ENOMEM. */ | |
113 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
114 | goto error; | |
115 | } | |
116 | } else { | |
d8ef542d | 117 | ret = consumer_add_channel(channel, ctx); |
3bd1e081 MD |
118 | } |
119 | ||
d88aee68 | 120 | DBG("UST consumer channel added (key: %" PRIu64 ")", channel->key); |
ffe60014 DG |
121 | |
122 | error: | |
3bd1e081 MD |
123 | return ret; |
124 | } | |
125 | ||
ffe60014 DG |
126 | /* |
127 | * Allocate and return a consumer stream object. If _alloc_ret is not NULL, the | |
128 | * error value if applicable is set in it else it is kept untouched. | |
3bd1e081 | 129 | * |
ffe60014 | 130 | * Return NULL on error else the newly allocated stream object. |
3bd1e081 | 131 | */ |
ffe60014 DG |
132 | static struct lttng_consumer_stream *allocate_stream(int cpu, int key, |
133 | struct lttng_consumer_channel *channel, | |
e5148e25 | 134 | struct lttng_consumer_local_data *ctx, int *_alloc_ret) |
ffe60014 DG |
135 | { |
136 | int alloc_ret; | |
137 | struct lttng_consumer_stream *stream = NULL; | |
138 | ||
139 | assert(channel); | |
140 | assert(ctx); | |
141 | ||
6f1177cf | 142 | stream = consumer_stream_create( |
c0c85e4f JG |
143 | channel, |
144 | channel->key, | |
ffe60014 | 145 | key, |
ffe60014 | 146 | channel->name, |
ffe60014 DG |
147 | channel->relayd_id, |
148 | channel->session_id, | |
e5148e25 | 149 | channel->trace_chunk, |
ffe60014 DG |
150 | cpu, |
151 | &alloc_ret, | |
4891ece8 | 152 | channel->type, |
e5148e25 | 153 | channel->monitor); |
ffe60014 DG |
154 | if (stream == NULL) { |
155 | switch (alloc_ret) { | |
156 | case -ENOENT: | |
157 | /* | |
158 | * We could not find the channel. Can happen if cpu hotplug | |
159 | * happens while tearing down. | |
160 | */ | |
161 | DBG3("Could not find channel"); | |
162 | break; | |
163 | case -ENOMEM: | |
164 | case -EINVAL: | |
165 | default: | |
166 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
167 | break; | |
168 | } | |
169 | goto error; | |
170 | } | |
171 | ||
d9a2e16e | 172 | consumer_stream_update_channel_attributes(stream, channel); |
ffe60014 DG |
173 | |
174 | error: | |
175 | if (_alloc_ret) { | |
176 | *_alloc_ret = alloc_ret; | |
177 | } | |
178 | return stream; | |
179 | } | |
180 | ||
181 | /* | |
182 | * Send the given stream pointer to the corresponding thread. | |
183 | * | |
184 | * Returns 0 on success else a negative value. | |
185 | */ | |
186 | static int send_stream_to_thread(struct lttng_consumer_stream *stream, | |
187 | struct lttng_consumer_local_data *ctx) | |
188 | { | |
dae10966 DG |
189 | int ret; |
190 | struct lttng_pipe *stream_pipe; | |
ffe60014 DG |
191 | |
192 | /* Get the right pipe where the stream will be sent. */ | |
193 | if (stream->metadata_flag) { | |
66d583dc | 194 | consumer_add_metadata_stream(stream); |
dae10966 | 195 | stream_pipe = ctx->consumer_metadata_pipe; |
ffe60014 | 196 | } else { |
66d583dc | 197 | consumer_add_data_stream(stream); |
dae10966 | 198 | stream_pipe = ctx->consumer_data_pipe; |
ffe60014 DG |
199 | } |
200 | ||
5ab66908 MD |
201 | /* |
202 | * From this point on, the stream's ownership has been moved away from | |
a8086cf4 JR |
203 | * the channel and it becomes globally visible. Hence, remove it from |
204 | * the local stream list to prevent the stream from being both local and | |
205 | * global. | |
5ab66908 MD |
206 | */ |
207 | stream->globally_visible = 1; | |
a8086cf4 | 208 | cds_list_del(&stream->send_node); |
5ab66908 | 209 | |
dae10966 | 210 | ret = lttng_pipe_write(stream_pipe, &stream, sizeof(stream)); |
ffe60014 | 211 | if (ret < 0) { |
dae10966 DG |
212 | ERR("Consumer write %s stream to pipe %d", |
213 | stream->metadata_flag ? "metadata" : "data", | |
214 | lttng_pipe_get_writefd(stream_pipe)); | |
5ab66908 MD |
215 | if (stream->metadata_flag) { |
216 | consumer_del_stream_for_metadata(stream); | |
217 | } else { | |
218 | consumer_del_stream_for_data(stream); | |
219 | } | |
a8086cf4 | 220 | goto error; |
ffe60014 | 221 | } |
a8086cf4 | 222 | |
5ab66908 | 223 | error: |
ffe60014 DG |
224 | return ret; |
225 | } | |
226 | ||
4628484a MD |
227 | static |
228 | int get_stream_shm_path(char *stream_shm_path, const char *shm_path, int cpu) | |
229 | { | |
45863397 | 230 | char cpu_nr[INT_MAX_STR_LEN]; /* int max len */ |
4628484a MD |
231 | int ret; |
232 | ||
233 | strncpy(stream_shm_path, shm_path, PATH_MAX); | |
234 | stream_shm_path[PATH_MAX - 1] = '\0'; | |
45863397 | 235 | ret = snprintf(cpu_nr, INT_MAX_STR_LEN, "%i", cpu); |
67f8cb8d MD |
236 | if (ret < 0) { |
237 | PERROR("snprintf"); | |
4628484a MD |
238 | goto end; |
239 | } | |
240 | strncat(stream_shm_path, cpu_nr, | |
241 | PATH_MAX - strlen(stream_shm_path) - 1); | |
242 | ret = 0; | |
243 | end: | |
244 | return ret; | |
245 | } | |
246 | ||
d88aee68 DG |
247 | /* |
248 | * Create streams for the given channel using liblttng-ust-ctl. | |
e5148e25 | 249 | * The channel lock must be acquired by the caller. |
d88aee68 DG |
250 | * |
251 | * Return 0 on success else a negative value. | |
252 | */ | |
ffe60014 | 253 | static int create_ust_streams(struct lttng_consumer_channel *channel, |
e5148e25 | 254 | struct lttng_consumer_local_data *ctx) |
ffe60014 DG |
255 | { |
256 | int ret, cpu = 0; | |
257 | struct ustctl_consumer_stream *ustream; | |
258 | struct lttng_consumer_stream *stream; | |
e5148e25 | 259 | pthread_mutex_t *current_stream_lock = NULL; |
ffe60014 DG |
260 | |
261 | assert(channel); | |
262 | assert(ctx); | |
263 | ||
264 | /* | |
265 | * While a stream is available from ustctl. When NULL is returned, we've | |
266 | * reached the end of the possible stream for the channel. | |
267 | */ | |
268 | while ((ustream = ustctl_create_stream(channel->uchan, cpu))) { | |
269 | int wait_fd; | |
04ef1097 | 270 | int ust_metadata_pipe[2]; |
ffe60014 | 271 | |
9ce5646a MD |
272 | health_code_update(); |
273 | ||
04ef1097 MD |
274 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && channel->monitor) { |
275 | ret = utils_create_pipe_cloexec_nonblock(ust_metadata_pipe); | |
276 | if (ret < 0) { | |
277 | ERR("Create ust metadata poll pipe"); | |
278 | goto error; | |
279 | } | |
280 | wait_fd = ust_metadata_pipe[0]; | |
281 | } else { | |
282 | wait_fd = ustctl_stream_get_wait_fd(ustream); | |
283 | } | |
ffe60014 DG |
284 | |
285 | /* Allocate consumer stream object. */ | |
e5148e25 | 286 | stream = allocate_stream(cpu, wait_fd, channel, ctx, &ret); |
ffe60014 DG |
287 | if (!stream) { |
288 | goto error_alloc; | |
289 | } | |
290 | stream->ustream = ustream; | |
291 | /* | |
292 | * Store it so we can save multiple function calls afterwards since | |
293 | * this value is used heavily in the stream threads. This is UST | |
294 | * specific so this is why it's done after allocation. | |
295 | */ | |
296 | stream->wait_fd = wait_fd; | |
297 | ||
b31398bb DG |
298 | /* |
299 | * Increment channel refcount since the channel reference has now been | |
300 | * assigned in the allocation process above. | |
301 | */ | |
10a50311 JD |
302 | if (stream->chan->monitor) { |
303 | uatomic_inc(&stream->chan->refcount); | |
304 | } | |
b31398bb | 305 | |
e5148e25 JG |
306 | pthread_mutex_lock(&stream->lock); |
307 | current_stream_lock = &stream->lock; | |
ffe60014 DG |
308 | /* |
309 | * Order is important this is why a list is used. On error, the caller | |
310 | * should clean this list. | |
311 | */ | |
312 | cds_list_add_tail(&stream->send_node, &channel->streams.head); | |
313 | ||
314 | ret = ustctl_get_max_subbuf_size(stream->ustream, | |
315 | &stream->max_sb_size); | |
316 | if (ret < 0) { | |
317 | ERR("ustctl_get_max_subbuf_size failed for stream %s", | |
318 | stream->name); | |
319 | goto error; | |
320 | } | |
321 | ||
322 | /* Do actions once stream has been received. */ | |
323 | if (ctx->on_recv_stream) { | |
324 | ret = ctx->on_recv_stream(stream); | |
325 | if (ret < 0) { | |
326 | goto error; | |
327 | } | |
328 | } | |
329 | ||
d88aee68 | 330 | DBG("UST consumer add stream %s (key: %" PRIu64 ") with relayd id %" PRIu64, |
ffe60014 DG |
331 | stream->name, stream->key, stream->relayd_stream_id); |
332 | ||
333 | /* Set next CPU stream. */ | |
334 | channel->streams.count = ++cpu; | |
d88aee68 DG |
335 | |
336 | /* Keep stream reference when creating metadata. */ | |
337 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) { | |
338 | channel->metadata_stream = stream; | |
8de4f941 JG |
339 | if (channel->monitor) { |
340 | /* Set metadata poll pipe if we created one */ | |
341 | memcpy(stream->ust_metadata_poll_pipe, | |
342 | ust_metadata_pipe, | |
343 | sizeof(ust_metadata_pipe)); | |
344 | } | |
d88aee68 | 345 | } |
e5148e25 JG |
346 | pthread_mutex_unlock(&stream->lock); |
347 | current_stream_lock = NULL; | |
ffe60014 DG |
348 | } |
349 | ||
350 | return 0; | |
351 | ||
352 | error: | |
353 | error_alloc: | |
e5148e25 JG |
354 | if (current_stream_lock) { |
355 | pthread_mutex_unlock(current_stream_lock); | |
356 | } | |
ffe60014 DG |
357 | return ret; |
358 | } | |
359 | ||
4628484a MD |
360 | /* |
361 | * create_posix_shm is never called concurrently within a process. | |
362 | */ | |
363 | static | |
364 | int create_posix_shm(void) | |
365 | { | |
366 | char tmp_name[NAME_MAX]; | |
367 | int shmfd, ret; | |
368 | ||
369 | ret = snprintf(tmp_name, NAME_MAX, "/ust-shm-consumer-%d", getpid()); | |
370 | if (ret < 0) { | |
371 | PERROR("snprintf"); | |
372 | return -1; | |
373 | } | |
374 | /* | |
375 | * Allocate shm, and immediately unlink its shm oject, keeping | |
376 | * only the file descriptor as a reference to the object. | |
377 | * We specifically do _not_ use the / at the beginning of the | |
378 | * pathname so that some OS implementations can keep it local to | |
379 | * the process (POSIX leaves this implementation-defined). | |
380 | */ | |
381 | shmfd = shm_open(tmp_name, O_CREAT | O_EXCL | O_RDWR, 0700); | |
382 | if (shmfd < 0) { | |
383 | PERROR("shm_open"); | |
384 | goto error_shm_open; | |
385 | } | |
386 | ret = shm_unlink(tmp_name); | |
387 | if (ret < 0 && errno != ENOENT) { | |
388 | PERROR("shm_unlink"); | |
389 | goto error_shm_release; | |
390 | } | |
391 | return shmfd; | |
392 | ||
393 | error_shm_release: | |
394 | ret = close(shmfd); | |
395 | if (ret) { | |
396 | PERROR("close"); | |
397 | } | |
398 | error_shm_open: | |
399 | return -1; | |
400 | } | |
401 | ||
e5148e25 JG |
402 | static int open_ust_stream_fd(struct lttng_consumer_channel *channel, int cpu, |
403 | const struct lttng_credentials *session_credentials) | |
4628484a MD |
404 | { |
405 | char shm_path[PATH_MAX]; | |
406 | int ret; | |
407 | ||
408 | if (!channel->shm_path[0]) { | |
409 | return create_posix_shm(); | |
410 | } | |
411 | ret = get_stream_shm_path(shm_path, channel->shm_path, cpu); | |
412 | if (ret) { | |
413 | goto error_shm_path; | |
414 | } | |
415 | return run_as_open(shm_path, | |
416 | O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR, | |
e5148e25 | 417 | session_credentials->uid, session_credentials->gid); |
4628484a MD |
418 | |
419 | error_shm_path: | |
420 | return -1; | |
421 | } | |
422 | ||
ffe60014 DG |
423 | /* |
424 | * Create an UST channel with the given attributes and send it to the session | |
425 | * daemon using the ust ctl API. | |
426 | * | |
427 | * Return 0 on success or else a negative value. | |
428 | */ | |
4628484a MD |
429 | static int create_ust_channel(struct lttng_consumer_channel *channel, |
430 | struct ustctl_consumer_channel_attr *attr, | |
431 | struct ustctl_consumer_channel **ust_chanp) | |
ffe60014 | 432 | { |
4628484a MD |
433 | int ret, nr_stream_fds, i, j; |
434 | int *stream_fds; | |
435 | struct ustctl_consumer_channel *ust_channel; | |
ffe60014 | 436 | |
4628484a | 437 | assert(channel); |
ffe60014 | 438 | assert(attr); |
4628484a | 439 | assert(ust_chanp); |
e5148e25 | 440 | assert(channel->buffer_credentials.is_set); |
ffe60014 DG |
441 | |
442 | DBG3("Creating channel to ustctl with attr: [overwrite: %d, " | |
443 | "subbuf_size: %" PRIu64 ", num_subbuf: %" PRIu64 ", " | |
444 | "switch_timer_interval: %u, read_timer_interval: %u, " | |
445 | "output: %d, type: %d", attr->overwrite, attr->subbuf_size, | |
446 | attr->num_subbuf, attr->switch_timer_interval, | |
447 | attr->read_timer_interval, attr->output, attr->type); | |
448 | ||
4628484a MD |
449 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) |
450 | nr_stream_fds = 1; | |
451 | else | |
452 | nr_stream_fds = ustctl_get_nr_stream_per_channel(); | |
453 | stream_fds = zmalloc(nr_stream_fds * sizeof(*stream_fds)); | |
454 | if (!stream_fds) { | |
455 | ret = -1; | |
456 | goto error_alloc; | |
457 | } | |
458 | for (i = 0; i < nr_stream_fds; i++) { | |
e5148e25 JG |
459 | stream_fds[i] = open_ust_stream_fd(channel, i, |
460 | &channel->buffer_credentials.value); | |
4628484a MD |
461 | if (stream_fds[i] < 0) { |
462 | ret = -1; | |
463 | goto error_open; | |
464 | } | |
465 | } | |
466 | ust_channel = ustctl_create_channel(attr, stream_fds, nr_stream_fds); | |
467 | if (!ust_channel) { | |
ffe60014 DG |
468 | ret = -1; |
469 | goto error_create; | |
470 | } | |
4628484a MD |
471 | channel->nr_stream_fds = nr_stream_fds; |
472 | channel->stream_fds = stream_fds; | |
473 | *ust_chanp = ust_channel; | |
ffe60014 DG |
474 | |
475 | return 0; | |
476 | ||
477 | error_create: | |
4628484a MD |
478 | error_open: |
479 | for (j = i - 1; j >= 0; j--) { | |
480 | int closeret; | |
481 | ||
482 | closeret = close(stream_fds[j]); | |
483 | if (closeret) { | |
484 | PERROR("close"); | |
485 | } | |
486 | if (channel->shm_path[0]) { | |
487 | char shm_path[PATH_MAX]; | |
488 | ||
489 | closeret = get_stream_shm_path(shm_path, | |
490 | channel->shm_path, j); | |
491 | if (closeret) { | |
492 | ERR("Cannot get stream shm path"); | |
493 | } | |
494 | closeret = run_as_unlink(shm_path, | |
e5148e25 JG |
495 | channel->buffer_credentials.value.uid, |
496 | channel->buffer_credentials.value.gid); | |
4628484a | 497 | if (closeret) { |
4628484a MD |
498 | PERROR("unlink %s", shm_path); |
499 | } | |
500 | } | |
501 | } | |
502 | /* Try to rmdir all directories under shm_path root. */ | |
503 | if (channel->root_shm_path[0]) { | |
602766ec | 504 | (void) run_as_rmdir_recursive(channel->root_shm_path, |
e5148e25 | 505 | channel->buffer_credentials.value.uid, |
58ec7253 MD |
506 | channel->buffer_credentials.value.gid, |
507 | LTTNG_DIRECTORY_HANDLE_SKIP_NON_EMPTY_FLAG); | |
4628484a MD |
508 | } |
509 | free(stream_fds); | |
510 | error_alloc: | |
ffe60014 DG |
511 | return ret; |
512 | } | |
513 | ||
d88aee68 DG |
514 | /* |
515 | * Send a single given stream to the session daemon using the sock. | |
516 | * | |
517 | * Return 0 on success else a negative value. | |
518 | */ | |
ffe60014 DG |
519 | static int send_sessiond_stream(int sock, struct lttng_consumer_stream *stream) |
520 | { | |
521 | int ret; | |
522 | ||
523 | assert(stream); | |
524 | assert(sock >= 0); | |
525 | ||
3eb914c0 | 526 | DBG("UST consumer sending stream %" PRIu64 " to sessiond", stream->key); |
ffe60014 DG |
527 | |
528 | /* Send stream to session daemon. */ | |
529 | ret = ustctl_send_stream_to_sessiond(sock, stream->ustream); | |
530 | if (ret < 0) { | |
531 | goto error; | |
532 | } | |
533 | ||
ffe60014 DG |
534 | error: |
535 | return ret; | |
536 | } | |
537 | ||
538 | /* | |
a3a86f35 | 539 | * Send channel to sessiond and relayd if applicable. |
ffe60014 | 540 | * |
d88aee68 | 541 | * Return 0 on success or else a negative value. |
ffe60014 | 542 | */ |
a3a86f35 | 543 | static int send_channel_to_sessiond_and_relayd(int sock, |
ffe60014 DG |
544 | struct lttng_consumer_channel *channel, |
545 | struct lttng_consumer_local_data *ctx, int *relayd_error) | |
546 | { | |
0c759fc9 | 547 | int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
ffe60014 | 548 | struct lttng_consumer_stream *stream; |
a4baae1b | 549 | uint64_t net_seq_idx = -1ULL; |
ffe60014 DG |
550 | |
551 | assert(channel); | |
552 | assert(ctx); | |
553 | assert(sock >= 0); | |
554 | ||
555 | DBG("UST consumer sending channel %s to sessiond", channel->name); | |
556 | ||
62285ea4 DG |
557 | if (channel->relayd_id != (uint64_t) -1ULL) { |
558 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
559 | |
560 | health_code_update(); | |
561 | ||
62285ea4 | 562 | /* Try to send the stream to the relayd if one is available. */ |
a3a86f35 JG |
563 | DBG("Sending stream %" PRIu64 " of channel \"%s\" to relayd", |
564 | stream->key, channel->name); | |
62285ea4 DG |
565 | ret = consumer_send_relayd_stream(stream, stream->chan->pathname); |
566 | if (ret < 0) { | |
567 | /* | |
568 | * Flag that the relayd was the problem here probably due to a | |
569 | * communicaton error on the socket. | |
570 | */ | |
571 | if (relayd_error) { | |
572 | *relayd_error = 1; | |
573 | } | |
725d28b2 | 574 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
ffe60014 | 575 | } |
a4baae1b JD |
576 | if (net_seq_idx == -1ULL) { |
577 | net_seq_idx = stream->net_seq_idx; | |
578 | } | |
579 | } | |
f2a444f1 | 580 | } |
ffe60014 | 581 | |
f2a444f1 DG |
582 | /* Inform sessiond that we are about to send channel and streams. */ |
583 | ret = consumer_send_status_msg(sock, ret_code); | |
0c759fc9 | 584 | if (ret < 0 || ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
f2a444f1 DG |
585 | /* |
586 | * Either the session daemon is not responding or the relayd died so we | |
587 | * stop now. | |
588 | */ | |
589 | goto error; | |
590 | } | |
591 | ||
592 | /* Send channel to sessiond. */ | |
593 | ret = ustctl_send_channel_to_sessiond(sock, channel->uchan); | |
594 | if (ret < 0) { | |
595 | goto error; | |
596 | } | |
597 | ||
598 | ret = ustctl_channel_close_wakeup_fd(channel->uchan); | |
599 | if (ret < 0) { | |
600 | goto error; | |
601 | } | |
602 | ||
603 | /* The channel was sent successfully to the sessiond at this point. */ | |
604 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
605 | |
606 | health_code_update(); | |
607 | ||
ffe60014 DG |
608 | /* Send stream to session daemon. */ |
609 | ret = send_sessiond_stream(sock, stream); | |
610 | if (ret < 0) { | |
611 | goto error; | |
612 | } | |
613 | } | |
614 | ||
615 | /* Tell sessiond there is no more stream. */ | |
616 | ret = ustctl_send_stream_to_sessiond(sock, NULL); | |
617 | if (ret < 0) { | |
618 | goto error; | |
619 | } | |
620 | ||
621 | DBG("UST consumer NULL stream sent to sessiond"); | |
622 | ||
623 | return 0; | |
624 | ||
625 | error: | |
0c759fc9 | 626 | if (ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
f2a444f1 DG |
627 | ret = -1; |
628 | } | |
ffe60014 DG |
629 | return ret; |
630 | } | |
631 | ||
632 | /* | |
633 | * Creates a channel and streams and add the channel it to the channel internal | |
634 | * state. The created stream must ONLY be sent once the GET_CHANNEL command is | |
635 | * received. | |
636 | * | |
637 | * Return 0 on success or else, a negative value is returned and the channel | |
638 | * MUST be destroyed by consumer_del_channel(). | |
639 | */ | |
75cfe9e6 | 640 | static int ask_channel(struct lttng_consumer_local_data *ctx, |
ffe60014 | 641 | struct lttng_consumer_channel *channel, |
e5148e25 | 642 | struct ustctl_consumer_channel_attr *attr) |
3bd1e081 MD |
643 | { |
644 | int ret; | |
645 | ||
ffe60014 DG |
646 | assert(ctx); |
647 | assert(channel); | |
648 | assert(attr); | |
649 | ||
650 | /* | |
651 | * This value is still used by the kernel consumer since for the kernel, | |
652 | * the stream ownership is not IN the consumer so we need to have the | |
653 | * number of left stream that needs to be initialized so we can know when | |
654 | * to delete the channel (see consumer.c). | |
655 | * | |
656 | * As for the user space tracer now, the consumer creates and sends the | |
657 | * stream to the session daemon which only sends them to the application | |
658 | * once every stream of a channel is received making this value useless | |
659 | * because we they will be added to the poll thread before the application | |
660 | * receives them. This ensures that a stream can not hang up during | |
661 | * initilization of a channel. | |
662 | */ | |
663 | channel->nb_init_stream_left = 0; | |
664 | ||
665 | /* The reply msg status is handled in the following call. */ | |
4628484a | 666 | ret = create_ust_channel(channel, attr, &channel->uchan); |
ffe60014 | 667 | if (ret < 0) { |
10a50311 | 668 | goto end; |
3bd1e081 MD |
669 | } |
670 | ||
d8ef542d MD |
671 | channel->wait_fd = ustctl_channel_get_wait_fd(channel->uchan); |
672 | ||
10a50311 JD |
673 | /* |
674 | * For the snapshots (no monitor), we create the metadata streams | |
675 | * on demand, not during the channel creation. | |
676 | */ | |
677 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && !channel->monitor) { | |
678 | ret = 0; | |
679 | goto end; | |
680 | } | |
681 | ||
ffe60014 | 682 | /* Open all streams for this channel. */ |
e5148e25 JG |
683 | pthread_mutex_lock(&channel->lock); |
684 | ret = create_ust_streams(channel, ctx); | |
685 | pthread_mutex_unlock(&channel->lock); | |
ffe60014 | 686 | if (ret < 0) { |
10a50311 | 687 | goto end; |
ffe60014 DG |
688 | } |
689 | ||
10a50311 | 690 | end: |
3bd1e081 MD |
691 | return ret; |
692 | } | |
693 | ||
d88aee68 DG |
694 | /* |
695 | * Send all stream of a channel to the right thread handling it. | |
696 | * | |
697 | * On error, return a negative value else 0 on success. | |
698 | */ | |
699 | static int send_streams_to_thread(struct lttng_consumer_channel *channel, | |
700 | struct lttng_consumer_local_data *ctx) | |
701 | { | |
702 | int ret = 0; | |
703 | struct lttng_consumer_stream *stream, *stmp; | |
704 | ||
705 | assert(channel); | |
706 | assert(ctx); | |
707 | ||
708 | /* Send streams to the corresponding thread. */ | |
709 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
710 | send_node) { | |
9ce5646a MD |
711 | |
712 | health_code_update(); | |
713 | ||
d88aee68 DG |
714 | /* Sending the stream to the thread. */ |
715 | ret = send_stream_to_thread(stream, ctx); | |
716 | if (ret < 0) { | |
717 | /* | |
718 | * If we are unable to send the stream to the thread, there is | |
719 | * a big problem so just stop everything. | |
720 | */ | |
721 | goto error; | |
722 | } | |
d88aee68 DG |
723 | } |
724 | ||
725 | error: | |
726 | return ret; | |
727 | } | |
728 | ||
7972aab2 DG |
729 | /* |
730 | * Flush channel's streams using the given key to retrieve the channel. | |
731 | * | |
732 | * Return 0 on success else an LTTng error code. | |
733 | */ | |
734 | static int flush_channel(uint64_t chan_key) | |
735 | { | |
736 | int ret = 0; | |
737 | struct lttng_consumer_channel *channel; | |
738 | struct lttng_consumer_stream *stream; | |
739 | struct lttng_ht *ht; | |
740 | struct lttng_ht_iter iter; | |
741 | ||
8fd623e0 | 742 | DBG("UST consumer flush channel key %" PRIu64, chan_key); |
7972aab2 | 743 | |
a500c257 | 744 | rcu_read_lock(); |
7972aab2 DG |
745 | channel = consumer_find_channel(chan_key); |
746 | if (!channel) { | |
8fd623e0 | 747 | ERR("UST consumer flush channel %" PRIu64 " not found", chan_key); |
7972aab2 DG |
748 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
749 | goto error; | |
750 | } | |
751 | ||
752 | ht = consumer_data.stream_per_chan_id_ht; | |
753 | ||
754 | /* For each stream of the channel id, flush it. */ | |
7972aab2 DG |
755 | cds_lfht_for_each_entry_duplicate(ht->ht, |
756 | ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct, | |
757 | &channel->key, &iter.iter, stream, node_channel_id.node) { | |
9ce5646a MD |
758 | |
759 | health_code_update(); | |
760 | ||
0dd01979 | 761 | pthread_mutex_lock(&stream->lock); |
54793f59 JR |
762 | |
763 | /* | |
764 | * Protect against concurrent teardown of a stream. | |
765 | */ | |
766 | if (cds_lfht_is_node_deleted(&stream->node.node)) { | |
767 | goto next; | |
768 | } | |
769 | ||
0dd01979 MD |
770 | if (!stream->quiescent) { |
771 | ustctl_flush_buffer(stream->ustream, 0); | |
772 | stream->quiescent = true; | |
773 | } | |
54793f59 | 774 | next: |
0dd01979 MD |
775 | pthread_mutex_unlock(&stream->lock); |
776 | } | |
777 | error: | |
778 | rcu_read_unlock(); | |
779 | return ret; | |
780 | } | |
781 | ||
782 | /* | |
783 | * Clear quiescent state from channel's streams using the given key to | |
784 | * retrieve the channel. | |
785 | * | |
786 | * Return 0 on success else an LTTng error code. | |
787 | */ | |
788 | static int clear_quiescent_channel(uint64_t chan_key) | |
789 | { | |
790 | int ret = 0; | |
791 | struct lttng_consumer_channel *channel; | |
792 | struct lttng_consumer_stream *stream; | |
793 | struct lttng_ht *ht; | |
794 | struct lttng_ht_iter iter; | |
795 | ||
796 | DBG("UST consumer clear quiescent channel key %" PRIu64, chan_key); | |
797 | ||
798 | rcu_read_lock(); | |
799 | channel = consumer_find_channel(chan_key); | |
800 | if (!channel) { | |
801 | ERR("UST consumer clear quiescent channel %" PRIu64 " not found", chan_key); | |
802 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
803 | goto error; | |
804 | } | |
805 | ||
806 | ht = consumer_data.stream_per_chan_id_ht; | |
807 | ||
808 | /* For each stream of the channel id, clear quiescent state. */ | |
809 | cds_lfht_for_each_entry_duplicate(ht->ht, | |
810 | ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct, | |
811 | &channel->key, &iter.iter, stream, node_channel_id.node) { | |
812 | ||
813 | health_code_update(); | |
814 | ||
815 | pthread_mutex_lock(&stream->lock); | |
816 | stream->quiescent = false; | |
817 | pthread_mutex_unlock(&stream->lock); | |
7972aab2 | 818 | } |
7972aab2 | 819 | error: |
a500c257 | 820 | rcu_read_unlock(); |
7972aab2 DG |
821 | return ret; |
822 | } | |
823 | ||
d88aee68 DG |
824 | /* |
825 | * Close metadata stream wakeup_fd using the given key to retrieve the channel. | |
826 | * | |
827 | * Return 0 on success else an LTTng error code. | |
828 | */ | |
829 | static int close_metadata(uint64_t chan_key) | |
830 | { | |
ea88ca2a | 831 | int ret = 0; |
d88aee68 | 832 | struct lttng_consumer_channel *channel; |
f65a74be | 833 | unsigned int channel_monitor; |
d88aee68 | 834 | |
8fd623e0 | 835 | DBG("UST consumer close metadata key %" PRIu64, chan_key); |
d88aee68 DG |
836 | |
837 | channel = consumer_find_channel(chan_key); | |
838 | if (!channel) { | |
84cc9aa0 DG |
839 | /* |
840 | * This is possible if the metadata thread has issue a delete because | |
841 | * the endpoint point of the stream hung up. There is no way the | |
842 | * session daemon can know about it thus use a DBG instead of an actual | |
843 | * error. | |
844 | */ | |
845 | DBG("UST consumer close metadata %" PRIu64 " not found", chan_key); | |
d88aee68 DG |
846 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
847 | goto error; | |
848 | } | |
849 | ||
ea88ca2a | 850 | pthread_mutex_lock(&consumer_data.lock); |
a9838785 | 851 | pthread_mutex_lock(&channel->lock); |
f65a74be | 852 | channel_monitor = channel->monitor; |
73811ecc DG |
853 | if (cds_lfht_is_node_deleted(&channel->node.node)) { |
854 | goto error_unlock; | |
855 | } | |
856 | ||
6d574024 | 857 | lttng_ustconsumer_close_metadata(channel); |
f65a74be JG |
858 | pthread_mutex_unlock(&channel->lock); |
859 | pthread_mutex_unlock(&consumer_data.lock); | |
d88aee68 | 860 | |
f65a74be JG |
861 | /* |
862 | * The ownership of a metadata channel depends on the type of | |
863 | * session to which it belongs. In effect, the monitor flag is checked | |
864 | * to determine if this metadata channel is in "snapshot" mode or not. | |
865 | * | |
866 | * In the non-snapshot case, the metadata channel is created along with | |
867 | * a single stream which will remain present until the metadata channel | |
868 | * is destroyed (on the destruction of its session). In this case, the | |
869 | * metadata stream in "monitored" by the metadata poll thread and holds | |
870 | * the ownership of its channel. | |
871 | * | |
872 | * Closing the metadata will cause the metadata stream's "metadata poll | |
873 | * pipe" to be closed. Closing this pipe will wake-up the metadata poll | |
874 | * thread which will teardown the metadata stream which, in return, | |
875 | * deletes the metadata channel. | |
876 | * | |
877 | * In the snapshot case, the metadata stream is created and destroyed | |
878 | * on every snapshot record. Since the channel doesn't have an owner | |
879 | * other than the session daemon, it is safe to destroy it immediately | |
880 | * on reception of the CLOSE_METADATA command. | |
881 | */ | |
882 | if (!channel_monitor) { | |
883 | /* | |
884 | * The channel and consumer_data locks must be | |
885 | * released before this call since consumer_del_channel | |
886 | * re-acquires the channel and consumer_data locks to teardown | |
887 | * the channel and queue its reclamation by the "call_rcu" | |
888 | * worker thread. | |
889 | */ | |
890 | consumer_del_channel(channel); | |
891 | } | |
892 | ||
893 | return ret; | |
ea88ca2a | 894 | error_unlock: |
a9838785 | 895 | pthread_mutex_unlock(&channel->lock); |
ea88ca2a | 896 | pthread_mutex_unlock(&consumer_data.lock); |
d88aee68 DG |
897 | error: |
898 | return ret; | |
899 | } | |
900 | ||
901 | /* | |
902 | * RCU read side lock MUST be acquired before calling this function. | |
903 | * | |
904 | * Return 0 on success else an LTTng error code. | |
905 | */ | |
906 | static int setup_metadata(struct lttng_consumer_local_data *ctx, uint64_t key) | |
907 | { | |
908 | int ret; | |
909 | struct lttng_consumer_channel *metadata; | |
910 | ||
8fd623e0 | 911 | DBG("UST consumer setup metadata key %" PRIu64, key); |
d88aee68 DG |
912 | |
913 | metadata = consumer_find_channel(key); | |
914 | if (!metadata) { | |
915 | ERR("UST consumer push metadata %" PRIu64 " not found", key); | |
916 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
10a50311 JD |
917 | goto end; |
918 | } | |
919 | ||
920 | /* | |
921 | * In no monitor mode, the metadata channel has no stream(s) so skip the | |
922 | * ownership transfer to the metadata thread. | |
923 | */ | |
924 | if (!metadata->monitor) { | |
925 | DBG("Metadata channel in no monitor"); | |
926 | ret = 0; | |
927 | goto end; | |
d88aee68 DG |
928 | } |
929 | ||
930 | /* | |
931 | * Send metadata stream to relayd if one available. Availability is | |
932 | * known if the stream is still in the list of the channel. | |
933 | */ | |
934 | if (cds_list_empty(&metadata->streams.head)) { | |
935 | ERR("Metadata channel key %" PRIu64 ", no stream available.", key); | |
936 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
f5a0c9cf | 937 | goto error_no_stream; |
d88aee68 DG |
938 | } |
939 | ||
940 | /* Send metadata stream to relayd if needed. */ | |
62285ea4 DG |
941 | if (metadata->metadata_stream->net_seq_idx != (uint64_t) -1ULL) { |
942 | ret = consumer_send_relayd_stream(metadata->metadata_stream, | |
943 | metadata->pathname); | |
944 | if (ret < 0) { | |
945 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
946 | goto error; | |
947 | } | |
601262d6 JD |
948 | ret = consumer_send_relayd_streams_sent( |
949 | metadata->metadata_stream->net_seq_idx); | |
950 | if (ret < 0) { | |
951 | ret = LTTCOMM_CONSUMERD_RELAYD_FAIL; | |
952 | goto error; | |
953 | } | |
d88aee68 DG |
954 | } |
955 | ||
a8086cf4 JR |
956 | /* |
957 | * Ownership of metadata stream is passed along. Freeing is handled by | |
958 | * the callee. | |
959 | */ | |
d88aee68 DG |
960 | ret = send_streams_to_thread(metadata, ctx); |
961 | if (ret < 0) { | |
962 | /* | |
963 | * If we are unable to send the stream to the thread, there is | |
964 | * a big problem so just stop everything. | |
965 | */ | |
966 | ret = LTTCOMM_CONSUMERD_FATAL; | |
a8086cf4 | 967 | goto send_streams_error; |
d88aee68 DG |
968 | } |
969 | /* List MUST be empty after or else it could be reused. */ | |
970 | assert(cds_list_empty(&metadata->streams.head)); | |
971 | ||
10a50311 JD |
972 | ret = 0; |
973 | goto end; | |
d88aee68 DG |
974 | |
975 | error: | |
f2a444f1 DG |
976 | /* |
977 | * Delete metadata channel on error. At this point, the metadata stream can | |
978 | * NOT be monitored by the metadata thread thus having the guarantee that | |
979 | * the stream is still in the local stream list of the channel. This call | |
980 | * will make sure to clean that list. | |
981 | */ | |
f5a0c9cf | 982 | consumer_stream_destroy(metadata->metadata_stream, NULL); |
212d67a2 DG |
983 | cds_list_del(&metadata->metadata_stream->send_node); |
984 | metadata->metadata_stream = NULL; | |
a8086cf4 | 985 | send_streams_error: |
f5a0c9cf | 986 | error_no_stream: |
10a50311 JD |
987 | end: |
988 | return ret; | |
989 | } | |
990 | ||
991 | /* | |
992 | * Snapshot the whole metadata. | |
e5148e25 | 993 | * RCU read-side lock must be held by the caller. |
10a50311 JD |
994 | * |
995 | * Returns 0 on success, < 0 on error | |
996 | */ | |
b0226bd4 MD |
997 | static int snapshot_metadata(struct lttng_consumer_channel *metadata_channel, |
998 | uint64_t key, char *path, uint64_t relayd_id, | |
e5148e25 | 999 | struct lttng_consumer_local_data *ctx) |
10a50311 JD |
1000 | { |
1001 | int ret = 0; | |
10a50311 JD |
1002 | struct lttng_consumer_stream *metadata_stream; |
1003 | ||
1004 | assert(path); | |
1005 | assert(ctx); | |
1006 | ||
1007 | DBG("UST consumer snapshot metadata with key %" PRIu64 " at path %s", | |
1008 | key, path); | |
1009 | ||
1010 | rcu_read_lock(); | |
1011 | ||
10a50311 JD |
1012 | assert(!metadata_channel->monitor); |
1013 | ||
9ce5646a MD |
1014 | health_code_update(); |
1015 | ||
10a50311 JD |
1016 | /* |
1017 | * Ask the sessiond if we have new metadata waiting and update the | |
1018 | * consumer metadata cache. | |
1019 | */ | |
94d49140 | 1020 | ret = lttng_ustconsumer_request_metadata(ctx, metadata_channel, 0, 1); |
10a50311 JD |
1021 | if (ret < 0) { |
1022 | goto error; | |
1023 | } | |
1024 | ||
9ce5646a MD |
1025 | health_code_update(); |
1026 | ||
10a50311 JD |
1027 | /* |
1028 | * The metadata stream is NOT created in no monitor mode when the channel | |
1029 | * is created on a sessiond ask channel command. | |
1030 | */ | |
e5148e25 | 1031 | ret = create_ust_streams(metadata_channel, ctx); |
10a50311 JD |
1032 | if (ret < 0) { |
1033 | goto error; | |
1034 | } | |
1035 | ||
1036 | metadata_stream = metadata_channel->metadata_stream; | |
1037 | assert(metadata_stream); | |
1038 | ||
e5148e25 | 1039 | pthread_mutex_lock(&metadata_stream->lock); |
10a50311 JD |
1040 | if (relayd_id != (uint64_t) -1ULL) { |
1041 | metadata_stream->net_seq_idx = relayd_id; | |
1042 | ret = consumer_send_relayd_stream(metadata_stream, path); | |
10a50311 | 1043 | } else { |
e5148e25 JG |
1044 | ret = consumer_stream_create_output_files(metadata_stream, |
1045 | false); | |
1046 | } | |
1047 | pthread_mutex_unlock(&metadata_stream->lock); | |
1048 | if (ret < 0) { | |
1049 | goto error_stream; | |
10a50311 JD |
1050 | } |
1051 | ||
04ef1097 | 1052 | do { |
9ce5646a MD |
1053 | health_code_update(); |
1054 | ||
6f1177cf | 1055 | ret = lttng_consumer_read_subbuffer(metadata_stream, ctx, true); |
10a50311 | 1056 | if (ret < 0) { |
94d49140 | 1057 | goto error_stream; |
10a50311 | 1058 | } |
04ef1097 | 1059 | } while (ret > 0); |
10a50311 | 1060 | |
10a50311 JD |
1061 | error_stream: |
1062 | /* | |
1063 | * Clean up the stream completly because the next snapshot will use a new | |
1064 | * metadata stream. | |
1065 | */ | |
10a50311 | 1066 | consumer_stream_destroy(metadata_stream, NULL); |
212d67a2 | 1067 | cds_list_del(&metadata_stream->send_node); |
10a50311 JD |
1068 | metadata_channel->metadata_stream = NULL; |
1069 | ||
1070 | error: | |
1071 | rcu_read_unlock(); | |
1072 | return ret; | |
1073 | } | |
1074 | ||
7775df52 JG |
1075 | static |
1076 | int get_current_subbuf_addr(struct lttng_consumer_stream *stream, | |
1077 | const char **addr) | |
1078 | { | |
1079 | int ret; | |
1080 | unsigned long mmap_offset; | |
1081 | const char *mmap_base; | |
1082 | ||
1083 | mmap_base = ustctl_get_mmap_base(stream->ustream); | |
1084 | if (!mmap_base) { | |
1085 | ERR("Failed to get mmap base for stream `%s`", | |
1086 | stream->name); | |
1087 | ret = -EPERM; | |
1088 | goto error; | |
1089 | } | |
1090 | ||
1091 | ret = ustctl_get_mmap_read_offset(stream->ustream, &mmap_offset); | |
1092 | if (ret != 0) { | |
1093 | ERR("Failed to get mmap offset for stream `%s`", stream->name); | |
1094 | ret = -EINVAL; | |
1095 | goto error; | |
1096 | } | |
1097 | ||
1098 | *addr = mmap_base + mmap_offset; | |
1099 | error: | |
1100 | return ret; | |
1101 | ||
1102 | } | |
1103 | ||
10a50311 JD |
1104 | /* |
1105 | * Take a snapshot of all the stream of a channel. | |
e5148e25 | 1106 | * RCU read-side lock and the channel lock must be held by the caller. |
10a50311 JD |
1107 | * |
1108 | * Returns 0 on success, < 0 on error | |
1109 | */ | |
b0226bd4 MD |
1110 | static int snapshot_channel(struct lttng_consumer_channel *channel, |
1111 | uint64_t key, char *path, uint64_t relayd_id, | |
e098433c JG |
1112 | uint64_t nb_packets_per_stream, |
1113 | struct lttng_consumer_local_data *ctx) | |
10a50311 JD |
1114 | { |
1115 | int ret; | |
1116 | unsigned use_relayd = 0; | |
1117 | unsigned long consumed_pos, produced_pos; | |
10a50311 JD |
1118 | struct lttng_consumer_stream *stream; |
1119 | ||
1120 | assert(path); | |
1121 | assert(ctx); | |
1122 | ||
1123 | rcu_read_lock(); | |
1124 | ||
1125 | if (relayd_id != (uint64_t) -1ULL) { | |
1126 | use_relayd = 1; | |
1127 | } | |
1128 | ||
10a50311 | 1129 | assert(!channel->monitor); |
6a00837f | 1130 | DBG("UST consumer snapshot channel %" PRIu64, key); |
10a50311 JD |
1131 | |
1132 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
1133 | health_code_update(); |
1134 | ||
10a50311 JD |
1135 | /* Lock stream because we are about to change its state. */ |
1136 | pthread_mutex_lock(&stream->lock); | |
e5148e25 JG |
1137 | assert(channel->trace_chunk); |
1138 | if (!lttng_trace_chunk_get(channel->trace_chunk)) { | |
1139 | /* | |
1140 | * Can't happen barring an internal error as the channel | |
1141 | * holds a reference to the trace chunk. | |
1142 | */ | |
1143 | ERR("Failed to acquire reference to channel's trace chunk"); | |
1144 | ret = -1; | |
1145 | goto error_unlock; | |
1146 | } | |
1147 | assert(!stream->trace_chunk); | |
1148 | stream->trace_chunk = channel->trace_chunk; | |
1149 | ||
10a50311 JD |
1150 | stream->net_seq_idx = relayd_id; |
1151 | ||
1152 | if (use_relayd) { | |
1153 | ret = consumer_send_relayd_stream(stream, path); | |
1154 | if (ret < 0) { | |
1155 | goto error_unlock; | |
1156 | } | |
1157 | } else { | |
e5148e25 JG |
1158 | ret = consumer_stream_create_output_files(stream, |
1159 | false); | |
10a50311 JD |
1160 | if (ret < 0) { |
1161 | goto error_unlock; | |
1162 | } | |
e5148e25 JG |
1163 | DBG("UST consumer snapshot stream (%" PRIu64 ")", |
1164 | stream->key); | |
10a50311 JD |
1165 | } |
1166 | ||
d4d80f77 MD |
1167 | /* |
1168 | * If tracing is active, we want to perform a "full" buffer flush. | |
1169 | * Else, if quiescent, it has already been done by the prior stop. | |
1170 | */ | |
1171 | if (!stream->quiescent) { | |
1172 | ustctl_flush_buffer(stream->ustream, 0); | |
1173 | } | |
10a50311 JD |
1174 | |
1175 | ret = lttng_ustconsumer_take_snapshot(stream); | |
1176 | if (ret < 0) { | |
1177 | ERR("Taking UST snapshot"); | |
1178 | goto error_unlock; | |
1179 | } | |
1180 | ||
1181 | ret = lttng_ustconsumer_get_produced_snapshot(stream, &produced_pos); | |
1182 | if (ret < 0) { | |
1183 | ERR("Produced UST snapshot position"); | |
1184 | goto error_unlock; | |
1185 | } | |
1186 | ||
1187 | ret = lttng_ustconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
1188 | if (ret < 0) { | |
1189 | ERR("Consumerd UST snapshot position"); | |
1190 | goto error_unlock; | |
1191 | } | |
1192 | ||
5c786ded JD |
1193 | /* |
1194 | * The original value is sent back if max stream size is larger than | |
d07ceecd | 1195 | * the possible size of the snapshot. Also, we assume that the session |
5c786ded JD |
1196 | * daemon should never send a maximum stream size that is lower than |
1197 | * subbuffer size. | |
1198 | */ | |
d07ceecd MD |
1199 | consumed_pos = consumer_get_consume_start_pos(consumed_pos, |
1200 | produced_pos, nb_packets_per_stream, | |
1201 | stream->max_sb_size); | |
5c786ded | 1202 | |
0fdaf1ed | 1203 | while ((long) (consumed_pos - produced_pos) < 0) { |
10a50311 JD |
1204 | ssize_t read_len; |
1205 | unsigned long len, padded_len; | |
7775df52 | 1206 | const char *subbuf_addr; |
b770aa7f | 1207 | struct lttng_buffer_view subbuf_view; |
10a50311 | 1208 | |
9ce5646a MD |
1209 | health_code_update(); |
1210 | ||
10a50311 JD |
1211 | DBG("UST consumer taking snapshot at pos %lu", consumed_pos); |
1212 | ||
1213 | ret = ustctl_get_subbuf(stream->ustream, &consumed_pos); | |
1214 | if (ret < 0) { | |
1215 | if (ret != -EAGAIN) { | |
1216 | PERROR("ustctl_get_subbuf snapshot"); | |
1217 | goto error_close_stream; | |
1218 | } | |
1219 | DBG("UST consumer get subbuf failed. Skipping it."); | |
1220 | consumed_pos += stream->max_sb_size; | |
ddc93ee4 | 1221 | stream->chan->lost_packets++; |
10a50311 JD |
1222 | continue; |
1223 | } | |
1224 | ||
1225 | ret = ustctl_get_subbuf_size(stream->ustream, &len); | |
1226 | if (ret < 0) { | |
1227 | ERR("Snapshot ustctl_get_subbuf_size"); | |
1228 | goto error_put_subbuf; | |
1229 | } | |
1230 | ||
1231 | ret = ustctl_get_padded_subbuf_size(stream->ustream, &padded_len); | |
1232 | if (ret < 0) { | |
1233 | ERR("Snapshot ustctl_get_padded_subbuf_size"); | |
1234 | goto error_put_subbuf; | |
1235 | } | |
1236 | ||
7775df52 JG |
1237 | ret = get_current_subbuf_addr(stream, &subbuf_addr); |
1238 | if (ret) { | |
1239 | goto error_put_subbuf; | |
1240 | } | |
1241 | ||
b770aa7f JG |
1242 | subbuf_view = lttng_buffer_view_init( |
1243 | subbuf_addr, 0, padded_len); | |
8d18bcae | 1244 | read_len = lttng_consumer_on_read_subbuffer_mmap( |
6f1177cf | 1245 | stream, &subbuf_view, padded_len - len); |
10a50311 JD |
1246 | if (use_relayd) { |
1247 | if (read_len != len) { | |
56591bac | 1248 | ret = -EPERM; |
10a50311 JD |
1249 | goto error_put_subbuf; |
1250 | } | |
1251 | } else { | |
1252 | if (read_len != padded_len) { | |
56591bac | 1253 | ret = -EPERM; |
10a50311 JD |
1254 | goto error_put_subbuf; |
1255 | } | |
1256 | } | |
1257 | ||
1258 | ret = ustctl_put_subbuf(stream->ustream); | |
1259 | if (ret < 0) { | |
1260 | ERR("Snapshot ustctl_put_subbuf"); | |
1261 | goto error_close_stream; | |
1262 | } | |
1263 | consumed_pos += stream->max_sb_size; | |
1264 | } | |
1265 | ||
1266 | /* Simply close the stream so we can use it on the next snapshot. */ | |
1267 | consumer_stream_close(stream); | |
1268 | pthread_mutex_unlock(&stream->lock); | |
1269 | } | |
1270 | ||
1271 | rcu_read_unlock(); | |
1272 | return 0; | |
1273 | ||
1274 | error_put_subbuf: | |
1275 | if (ustctl_put_subbuf(stream->ustream) < 0) { | |
1276 | ERR("Snapshot ustctl_put_subbuf"); | |
1277 | } | |
1278 | error_close_stream: | |
1279 | consumer_stream_close(stream); | |
1280 | error_unlock: | |
1281 | pthread_mutex_unlock(&stream->lock); | |
10a50311 | 1282 | rcu_read_unlock(); |
d88aee68 DG |
1283 | return ret; |
1284 | } | |
1285 | ||
331744e3 | 1286 | /* |
c585821b MD |
1287 | * Receive the metadata updates from the sessiond. Supports receiving |
1288 | * overlapping metadata, but is needs to always belong to a contiguous | |
1289 | * range starting from 0. | |
1290 | * Be careful about the locks held when calling this function: it needs | |
1291 | * the metadata cache flush to concurrently progress in order to | |
1292 | * complete. | |
331744e3 JD |
1293 | */ |
1294 | int lttng_ustconsumer_recv_metadata(int sock, uint64_t key, uint64_t offset, | |
93ec662e JD |
1295 | uint64_t len, uint64_t version, |
1296 | struct lttng_consumer_channel *channel, int timer, int wait) | |
331744e3 | 1297 | { |
0c759fc9 | 1298 | int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
331744e3 JD |
1299 | char *metadata_str; |
1300 | ||
8fd623e0 | 1301 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, len); |
331744e3 JD |
1302 | |
1303 | metadata_str = zmalloc(len * sizeof(char)); | |
1304 | if (!metadata_str) { | |
1305 | PERROR("zmalloc metadata string"); | |
1306 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; | |
1307 | goto end; | |
1308 | } | |
1309 | ||
9ce5646a MD |
1310 | health_code_update(); |
1311 | ||
331744e3 JD |
1312 | /* Receive metadata string. */ |
1313 | ret = lttcomm_recv_unix_sock(sock, metadata_str, len); | |
1314 | if (ret < 0) { | |
1315 | /* Session daemon is dead so return gracefully. */ | |
1316 | ret_code = ret; | |
1317 | goto end_free; | |
1318 | } | |
1319 | ||
9ce5646a MD |
1320 | health_code_update(); |
1321 | ||
331744e3 | 1322 | pthread_mutex_lock(&channel->metadata_cache->lock); |
93ec662e JD |
1323 | ret = consumer_metadata_cache_write(channel, offset, len, version, |
1324 | metadata_str); | |
331744e3 JD |
1325 | if (ret < 0) { |
1326 | /* Unable to handle metadata. Notify session daemon. */ | |
1327 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
a32bd775 DG |
1328 | /* |
1329 | * Skip metadata flush on write error since the offset and len might | |
1330 | * not have been updated which could create an infinite loop below when | |
1331 | * waiting for the metadata cache to be flushed. | |
1332 | */ | |
1333 | pthread_mutex_unlock(&channel->metadata_cache->lock); | |
a32bd775 | 1334 | goto end_free; |
331744e3 JD |
1335 | } |
1336 | pthread_mutex_unlock(&channel->metadata_cache->lock); | |
1337 | ||
94d49140 JD |
1338 | if (!wait) { |
1339 | goto end_free; | |
1340 | } | |
5e41ebe1 | 1341 | while (consumer_metadata_cache_flushed(channel, offset + len, timer)) { |
331744e3 | 1342 | DBG("Waiting for metadata to be flushed"); |
9ce5646a MD |
1343 | |
1344 | health_code_update(); | |
1345 | ||
331744e3 JD |
1346 | usleep(DEFAULT_METADATA_AVAILABILITY_WAIT_TIME); |
1347 | } | |
1348 | ||
1349 | end_free: | |
1350 | free(metadata_str); | |
1351 | end: | |
1352 | return ret_code; | |
1353 | } | |
1354 | ||
4cbc1a04 DG |
1355 | /* |
1356 | * Receive command from session daemon and process it. | |
1357 | * | |
1358 | * Return 1 on success else a negative value or 0. | |
1359 | */ | |
3bd1e081 MD |
1360 | int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
1361 | int sock, struct pollfd *consumer_sockpoll) | |
1362 | { | |
1363 | ssize_t ret; | |
0c759fc9 | 1364 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
3bd1e081 | 1365 | struct lttcomm_consumer_msg msg; |
ffe60014 | 1366 | struct lttng_consumer_channel *channel = NULL; |
3bd1e081 | 1367 | |
9ce5646a MD |
1368 | health_code_update(); |
1369 | ||
3bd1e081 MD |
1370 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); |
1371 | if (ret != sizeof(msg)) { | |
173af62f DG |
1372 | DBG("Consumer received unexpected message size %zd (expects %zu)", |
1373 | ret, sizeof(msg)); | |
3be74084 DG |
1374 | /* |
1375 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
1376 | * since the caller handles this. | |
1377 | */ | |
489f70e9 | 1378 | if (ret > 0) { |
c6857fcf | 1379 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
489f70e9 MD |
1380 | ret = -1; |
1381 | } | |
3bd1e081 MD |
1382 | return ret; |
1383 | } | |
9ce5646a MD |
1384 | |
1385 | health_code_update(); | |
1386 | ||
84382d49 MD |
1387 | /* deprecated */ |
1388 | assert(msg.cmd_type != LTTNG_CONSUMER_STOP); | |
3bd1e081 | 1389 | |
9ce5646a MD |
1390 | health_code_update(); |
1391 | ||
3f8e211f | 1392 | /* relayd needs RCU read-side lock */ |
b0b335c8 MD |
1393 | rcu_read_lock(); |
1394 | ||
3bd1e081 | 1395 | switch (msg.cmd_type) { |
00e2e675 DG |
1396 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
1397 | { | |
f50f23d9 | 1398 | /* Session daemon status message are handled in the following call. */ |
2527bf85 | 1399 | consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
7735ef9e | 1400 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, |
d3e2ba59 JD |
1401 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id, |
1402 | msg.u.relayd_sock.relayd_session_id); | |
00e2e675 DG |
1403 | goto end_nosignal; |
1404 | } | |
173af62f DG |
1405 | case LTTNG_CONSUMER_DESTROY_RELAYD: |
1406 | { | |
a6ba4fe1 | 1407 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
173af62f DG |
1408 | struct consumer_relayd_sock_pair *relayd; |
1409 | ||
a6ba4fe1 | 1410 | DBG("UST consumer destroying relayd %" PRIu64, index); |
173af62f DG |
1411 | |
1412 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 1413 | relayd = consumer_find_relayd(index); |
173af62f | 1414 | if (relayd == NULL) { |
3448e266 | 1415 | DBG("Unable to find relayd %" PRIu64, index); |
e462382a | 1416 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
173af62f DG |
1417 | } |
1418 | ||
a6ba4fe1 DG |
1419 | /* |
1420 | * Each relayd socket pair has a refcount of stream attached to it | |
1421 | * which tells if the relayd is still active or not depending on the | |
1422 | * refcount value. | |
1423 | * | |
1424 | * This will set the destroy flag of the relayd object and destroy it | |
1425 | * if the refcount reaches zero when called. | |
1426 | * | |
1427 | * The destroy can happen either here or when a stream fd hangs up. | |
1428 | */ | |
f50f23d9 DG |
1429 | if (relayd) { |
1430 | consumer_flag_relayd_for_destroy(relayd); | |
1431 | } | |
1432 | ||
d88aee68 | 1433 | goto end_msg_sessiond; |
173af62f | 1434 | } |
3bd1e081 MD |
1435 | case LTTNG_CONSUMER_UPDATE_STREAM: |
1436 | { | |
3f8e211f | 1437 | rcu_read_unlock(); |
7ad0a0cb | 1438 | return -ENOSYS; |
3bd1e081 | 1439 | } |
6d805429 | 1440 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 1441 | { |
3be74084 | 1442 | int ret, is_data_pending; |
6d805429 | 1443 | uint64_t id = msg.u.data_pending.session_id; |
ca22feea | 1444 | |
6d805429 | 1445 | DBG("UST consumer data pending command for id %" PRIu64, id); |
ca22feea | 1446 | |
3be74084 | 1447 | is_data_pending = consumer_data_pending(id); |
ca22feea DG |
1448 | |
1449 | /* Send back returned value to session daemon */ | |
3be74084 DG |
1450 | ret = lttcomm_send_unix_sock(sock, &is_data_pending, |
1451 | sizeof(is_data_pending)); | |
ca22feea | 1452 | if (ret < 0) { |
3be74084 | 1453 | DBG("Error when sending the data pending ret code: %d", ret); |
489f70e9 | 1454 | goto error_fatal; |
ca22feea | 1455 | } |
f50f23d9 DG |
1456 | |
1457 | /* | |
1458 | * No need to send back a status message since the data pending | |
1459 | * returned value is the response. | |
1460 | */ | |
ca22feea | 1461 | break; |
53632229 | 1462 | } |
ffe60014 DG |
1463 | case LTTNG_CONSUMER_ASK_CHANNEL_CREATION: |
1464 | { | |
1465 | int ret; | |
1466 | struct ustctl_consumer_channel_attr attr; | |
e5148e25 JG |
1467 | const uint64_t chunk_id = msg.u.ask_channel.chunk_id.value; |
1468 | const struct lttng_credentials buffer_credentials = { | |
1469 | .uid = msg.u.ask_channel.buffer_credentials.uid, | |
1470 | .gid = msg.u.ask_channel.buffer_credentials.gid, | |
1471 | }; | |
ffe60014 DG |
1472 | |
1473 | /* Create a plain object and reserve a channel key. */ | |
3ef395a9 JG |
1474 | channel = consumer_allocate_channel( |
1475 | msg.u.ask_channel.key, | |
1476 | msg.u.ask_channel.session_id, | |
e5148e25 JG |
1477 | msg.u.ask_channel.chunk_id.is_set ? |
1478 | &chunk_id : NULL, | |
1479 | msg.u.ask_channel.pathname, | |
1480 | msg.u.ask_channel.name, | |
1481 | msg.u.ask_channel.relayd_id, | |
1624d5b7 JD |
1482 | (enum lttng_event_output) msg.u.ask_channel.output, |
1483 | msg.u.ask_channel.tracefile_size, | |
2bba9e53 | 1484 | msg.u.ask_channel.tracefile_count, |
1950109e | 1485 | msg.u.ask_channel.session_id_per_pid, |
ecc48a90 | 1486 | msg.u.ask_channel.monitor, |
d7ba1388 | 1487 | msg.u.ask_channel.live_timer_interval, |
3ef395a9 | 1488 | msg.u.ask_channel.is_live, |
3d071855 | 1489 | msg.u.ask_channel.root_shm_path, |
d7ba1388 | 1490 | msg.u.ask_channel.shm_path); |
ffe60014 DG |
1491 | if (!channel) { |
1492 | goto end_channel_error; | |
1493 | } | |
1494 | ||
e5148e25 JG |
1495 | LTTNG_OPTIONAL_SET(&channel->buffer_credentials, |
1496 | buffer_credentials); | |
1497 | ||
567eb353 DG |
1498 | /* |
1499 | * Assign UST application UID to the channel. This value is ignored for | |
1500 | * per PID buffers. This is specific to UST thus setting this after the | |
1501 | * allocation. | |
1502 | */ | |
1503 | channel->ust_app_uid = msg.u.ask_channel.ust_app_uid; | |
1504 | ||
ffe60014 DG |
1505 | /* Build channel attributes from received message. */ |
1506 | attr.subbuf_size = msg.u.ask_channel.subbuf_size; | |
1507 | attr.num_subbuf = msg.u.ask_channel.num_subbuf; | |
1508 | attr.overwrite = msg.u.ask_channel.overwrite; | |
1509 | attr.switch_timer_interval = msg.u.ask_channel.switch_timer_interval; | |
1510 | attr.read_timer_interval = msg.u.ask_channel.read_timer_interval; | |
7972aab2 | 1511 | attr.chan_id = msg.u.ask_channel.chan_id; |
ffe60014 | 1512 | memcpy(attr.uuid, msg.u.ask_channel.uuid, sizeof(attr.uuid)); |
491d1539 | 1513 | attr.blocking_timeout= msg.u.ask_channel.blocking_timeout; |
ffe60014 | 1514 | |
0c759fc9 DG |
1515 | /* Match channel buffer type to the UST abi. */ |
1516 | switch (msg.u.ask_channel.output) { | |
1517 | case LTTNG_EVENT_MMAP: | |
1518 | default: | |
1519 | attr.output = LTTNG_UST_MMAP; | |
1520 | break; | |
1521 | } | |
1522 | ||
ffe60014 DG |
1523 | /* Translate and save channel type. */ |
1524 | switch (msg.u.ask_channel.type) { | |
1525 | case LTTNG_UST_CHAN_PER_CPU: | |
1526 | channel->type = CONSUMER_CHANNEL_TYPE_DATA; | |
1527 | attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8633d6e3 MD |
1528 | /* |
1529 | * Set refcount to 1 for owner. Below, we will | |
1530 | * pass ownership to the | |
1531 | * consumer_thread_channel_poll() thread. | |
1532 | */ | |
1533 | channel->refcount = 1; | |
ffe60014 DG |
1534 | break; |
1535 | case LTTNG_UST_CHAN_METADATA: | |
1536 | channel->type = CONSUMER_CHANNEL_TYPE_METADATA; | |
1537 | attr.type = LTTNG_UST_CHAN_METADATA; | |
1538 | break; | |
1539 | default: | |
1540 | assert(0); | |
1541 | goto error_fatal; | |
1542 | }; | |
1543 | ||
9ce5646a MD |
1544 | health_code_update(); |
1545 | ||
e5148e25 | 1546 | ret = ask_channel(ctx, channel, &attr); |
ffe60014 DG |
1547 | if (ret < 0) { |
1548 | goto end_channel_error; | |
1549 | } | |
1550 | ||
fc643247 MD |
1551 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
1552 | ret = consumer_metadata_cache_allocate(channel); | |
1553 | if (ret < 0) { | |
1554 | ERR("Allocating metadata cache"); | |
1555 | goto end_channel_error; | |
1556 | } | |
1557 | consumer_timer_switch_start(channel, attr.switch_timer_interval); | |
1558 | attr.switch_timer_interval = 0; | |
94d49140 | 1559 | } else { |
e9404c27 JG |
1560 | int monitor_start_ret; |
1561 | ||
94d49140 JD |
1562 | consumer_timer_live_start(channel, |
1563 | msg.u.ask_channel.live_timer_interval); | |
e9404c27 JG |
1564 | monitor_start_ret = consumer_timer_monitor_start( |
1565 | channel, | |
1566 | msg.u.ask_channel.monitor_timer_interval); | |
1567 | if (monitor_start_ret < 0) { | |
1568 | ERR("Starting channel monitoring timer failed"); | |
1569 | goto end_channel_error; | |
1570 | } | |
fc643247 MD |
1571 | } |
1572 | ||
9ce5646a MD |
1573 | health_code_update(); |
1574 | ||
ffe60014 DG |
1575 | /* |
1576 | * Add the channel to the internal state AFTER all streams were created | |
1577 | * and successfully sent to session daemon. This way, all streams must | |
1578 | * be ready before this channel is visible to the threads. | |
fc643247 MD |
1579 | * If add_channel succeeds, ownership of the channel is |
1580 | * passed to consumer_thread_channel_poll(). | |
ffe60014 DG |
1581 | */ |
1582 | ret = add_channel(channel, ctx); | |
1583 | if (ret < 0) { | |
ea88ca2a MD |
1584 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
1585 | if (channel->switch_timer_enabled == 1) { | |
1586 | consumer_timer_switch_stop(channel); | |
1587 | } | |
1588 | consumer_metadata_cache_destroy(channel); | |
1589 | } | |
d3e2ba59 JD |
1590 | if (channel->live_timer_enabled == 1) { |
1591 | consumer_timer_live_stop(channel); | |
1592 | } | |
e9404c27 JG |
1593 | if (channel->monitor_timer_enabled == 1) { |
1594 | consumer_timer_monitor_stop(channel); | |
1595 | } | |
ffe60014 DG |
1596 | goto end_channel_error; |
1597 | } | |
1598 | ||
9ce5646a MD |
1599 | health_code_update(); |
1600 | ||
ffe60014 DG |
1601 | /* |
1602 | * Channel and streams are now created. Inform the session daemon that | |
1603 | * everything went well and should wait to receive the channel and | |
1604 | * streams with ustctl API. | |
1605 | */ | |
1606 | ret = consumer_send_status_channel(sock, channel); | |
1607 | if (ret < 0) { | |
1608 | /* | |
489f70e9 | 1609 | * There is probably a problem on the socket. |
ffe60014 | 1610 | */ |
489f70e9 | 1611 | goto error_fatal; |
ffe60014 DG |
1612 | } |
1613 | ||
1614 | break; | |
1615 | } | |
1616 | case LTTNG_CONSUMER_GET_CHANNEL: | |
1617 | { | |
1618 | int ret, relayd_err = 0; | |
d88aee68 | 1619 | uint64_t key = msg.u.get_channel.key; |
ffe60014 | 1620 | struct lttng_consumer_channel *channel; |
ffe60014 DG |
1621 | |
1622 | channel = consumer_find_channel(key); | |
1623 | if (!channel) { | |
8fd623e0 | 1624 | ERR("UST consumer get channel key %" PRIu64 " not found", key); |
e462382a | 1625 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
57377f7d | 1626 | goto end_get_channel; |
ffe60014 DG |
1627 | } |
1628 | ||
9ce5646a MD |
1629 | health_code_update(); |
1630 | ||
a3a86f35 JG |
1631 | /* Send the channel to sessiond (and relayd, if applicable). */ |
1632 | ret = send_channel_to_sessiond_and_relayd(sock, channel, ctx, | |
1633 | &relayd_err); | |
ffe60014 DG |
1634 | if (ret < 0) { |
1635 | if (relayd_err) { | |
1636 | /* | |
1637 | * We were unable to send to the relayd the stream so avoid | |
1638 | * sending back a fatal error to the thread since this is OK | |
f2a444f1 DG |
1639 | * and the consumer can continue its work. The above call |
1640 | * has sent the error status message to the sessiond. | |
ffe60014 | 1641 | */ |
57377f7d | 1642 | goto end_get_channel_nosignal; |
ffe60014 DG |
1643 | } |
1644 | /* | |
1645 | * The communicaton was broken hence there is a bad state between | |
1646 | * the consumer and sessiond so stop everything. | |
1647 | */ | |
57377f7d | 1648 | goto error_get_channel_fatal; |
ffe60014 DG |
1649 | } |
1650 | ||
9ce5646a MD |
1651 | health_code_update(); |
1652 | ||
10a50311 JD |
1653 | /* |
1654 | * In no monitor mode, the streams ownership is kept inside the channel | |
1655 | * so don't send them to the data thread. | |
1656 | */ | |
1657 | if (!channel->monitor) { | |
57377f7d | 1658 | goto end_get_channel; |
10a50311 JD |
1659 | } |
1660 | ||
d88aee68 DG |
1661 | ret = send_streams_to_thread(channel, ctx); |
1662 | if (ret < 0) { | |
1663 | /* | |
1664 | * If we are unable to send the stream to the thread, there is | |
1665 | * a big problem so just stop everything. | |
1666 | */ | |
57377f7d | 1667 | goto error_get_channel_fatal; |
ffe60014 | 1668 | } |
ffe60014 DG |
1669 | /* List MUST be empty after or else it could be reused. */ |
1670 | assert(cds_list_empty(&channel->streams.head)); | |
57377f7d | 1671 | end_get_channel: |
d88aee68 | 1672 | goto end_msg_sessiond; |
57377f7d JG |
1673 | error_get_channel_fatal: |
1674 | goto error_fatal; | |
1675 | end_get_channel_nosignal: | |
1676 | goto end_nosignal; | |
d88aee68 DG |
1677 | } |
1678 | case LTTNG_CONSUMER_DESTROY_CHANNEL: | |
1679 | { | |
1680 | uint64_t key = msg.u.destroy_channel.key; | |
d88aee68 | 1681 | |
a0cbdd2e MD |
1682 | /* |
1683 | * Only called if streams have not been sent to stream | |
1684 | * manager thread. However, channel has been sent to | |
1685 | * channel manager thread. | |
1686 | */ | |
1687 | notify_thread_del_channel(ctx, key); | |
d88aee68 | 1688 | goto end_msg_sessiond; |
ffe60014 | 1689 | } |
d88aee68 DG |
1690 | case LTTNG_CONSUMER_CLOSE_METADATA: |
1691 | { | |
1692 | int ret; | |
1693 | ||
1694 | ret = close_metadata(msg.u.close_metadata.key); | |
1695 | if (ret != 0) { | |
1696 | ret_code = ret; | |
1697 | } | |
1698 | ||
1699 | goto end_msg_sessiond; | |
1700 | } | |
7972aab2 DG |
1701 | case LTTNG_CONSUMER_FLUSH_CHANNEL: |
1702 | { | |
1703 | int ret; | |
1704 | ||
1705 | ret = flush_channel(msg.u.flush_channel.key); | |
1706 | if (ret != 0) { | |
1707 | ret_code = ret; | |
1708 | } | |
1709 | ||
1710 | goto end_msg_sessiond; | |
1711 | } | |
0dd01979 MD |
1712 | case LTTNG_CONSUMER_CLEAR_QUIESCENT_CHANNEL: |
1713 | { | |
1714 | int ret; | |
1715 | ||
1716 | ret = clear_quiescent_channel( | |
1717 | msg.u.clear_quiescent_channel.key); | |
1718 | if (ret != 0) { | |
1719 | ret_code = ret; | |
1720 | } | |
1721 | ||
1722 | goto end_msg_sessiond; | |
1723 | } | |
d88aee68 | 1724 | case LTTNG_CONSUMER_PUSH_METADATA: |
ffe60014 DG |
1725 | { |
1726 | int ret; | |
d88aee68 | 1727 | uint64_t len = msg.u.push_metadata.len; |
d88aee68 | 1728 | uint64_t key = msg.u.push_metadata.key; |
331744e3 | 1729 | uint64_t offset = msg.u.push_metadata.target_offset; |
93ec662e | 1730 | uint64_t version = msg.u.push_metadata.version; |
ffe60014 DG |
1731 | struct lttng_consumer_channel *channel; |
1732 | ||
8fd623e0 DG |
1733 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, |
1734 | len); | |
ffe60014 DG |
1735 | |
1736 | channel = consumer_find_channel(key); | |
1737 | if (!channel) { | |
000baf6a DG |
1738 | /* |
1739 | * This is possible if the metadata creation on the consumer side | |
1740 | * is in flight vis-a-vis a concurrent push metadata from the | |
1741 | * session daemon. Simply return that the channel failed and the | |
1742 | * session daemon will handle that message correctly considering | |
1743 | * that this race is acceptable thus the DBG() statement here. | |
1744 | */ | |
1745 | DBG("UST consumer push metadata %" PRIu64 " not found", key); | |
1746 | ret_code = LTTCOMM_CONSUMERD_CHANNEL_FAIL; | |
8bb060b3 | 1747 | goto end_push_metadata_msg_sessiond; |
d88aee68 DG |
1748 | } |
1749 | ||
9ce5646a MD |
1750 | health_code_update(); |
1751 | ||
c585821b MD |
1752 | if (!len) { |
1753 | /* | |
1754 | * There is nothing to receive. We have simply | |
1755 | * checked whether the channel can be found. | |
1756 | */ | |
1757 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
8bb060b3 | 1758 | goto end_push_metadata_msg_sessiond; |
c585821b MD |
1759 | } |
1760 | ||
d88aee68 | 1761 | /* Tell session daemon we are ready to receive the metadata. */ |
0c759fc9 | 1762 | ret = consumer_send_status_msg(sock, LTTCOMM_CONSUMERD_SUCCESS); |
ffe60014 DG |
1763 | if (ret < 0) { |
1764 | /* Somehow, the session daemon is not responding anymore. */ | |
8bb060b3 | 1765 | goto error_push_metadata_fatal; |
d88aee68 DG |
1766 | } |
1767 | ||
9ce5646a MD |
1768 | health_code_update(); |
1769 | ||
d88aee68 | 1770 | /* Wait for more data. */ |
9ce5646a MD |
1771 | health_poll_entry(); |
1772 | ret = lttng_consumer_poll_socket(consumer_sockpoll); | |
1773 | health_poll_exit(); | |
84382d49 | 1774 | if (ret) { |
8bb060b3 | 1775 | goto error_push_metadata_fatal; |
d88aee68 DG |
1776 | } |
1777 | ||
9ce5646a MD |
1778 | health_code_update(); |
1779 | ||
331744e3 | 1780 | ret = lttng_ustconsumer_recv_metadata(sock, key, offset, |
93ec662e | 1781 | len, version, channel, 0, 1); |
d88aee68 | 1782 | if (ret < 0) { |
331744e3 | 1783 | /* error receiving from sessiond */ |
8bb060b3 | 1784 | goto error_push_metadata_fatal; |
331744e3 JD |
1785 | } else { |
1786 | ret_code = ret; | |
8bb060b3 | 1787 | goto end_push_metadata_msg_sessiond; |
d88aee68 | 1788 | } |
8bb060b3 JG |
1789 | end_push_metadata_msg_sessiond: |
1790 | goto end_msg_sessiond; | |
1791 | error_push_metadata_fatal: | |
1792 | goto error_fatal; | |
d88aee68 DG |
1793 | } |
1794 | case LTTNG_CONSUMER_SETUP_METADATA: | |
1795 | { | |
1796 | int ret; | |
1797 | ||
1798 | ret = setup_metadata(ctx, msg.u.setup_metadata.key); | |
1799 | if (ret) { | |
1800 | ret_code = ret; | |
1801 | } | |
1802 | goto end_msg_sessiond; | |
ffe60014 | 1803 | } |
6dc3064a DG |
1804 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
1805 | { | |
b0226bd4 MD |
1806 | struct lttng_consumer_channel *channel; |
1807 | uint64_t key = msg.u.snapshot_channel.key; | |
1808 | ||
1809 | channel = consumer_find_channel(key); | |
1810 | if (!channel) { | |
1811 | DBG("UST snapshot channel not found for key %" PRIu64, key); | |
1812 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
10a50311 | 1813 | } else { |
b0226bd4 MD |
1814 | if (msg.u.snapshot_channel.metadata) { |
1815 | ret = snapshot_metadata(channel, key, | |
1816 | msg.u.snapshot_channel.pathname, | |
1817 | msg.u.snapshot_channel.relayd_id, | |
e5148e25 | 1818 | ctx); |
b0226bd4 MD |
1819 | if (ret < 0) { |
1820 | ERR("Snapshot metadata failed"); | |
1821 | ret_code = LTTCOMM_CONSUMERD_SNAPSHOT_FAILED; | |
1822 | } | |
1823 | } else { | |
1824 | ret = snapshot_channel(channel, key, | |
1825 | msg.u.snapshot_channel.pathname, | |
1826 | msg.u.snapshot_channel.relayd_id, | |
1827 | msg.u.snapshot_channel.nb_packets_per_stream, | |
1828 | ctx); | |
1829 | if (ret < 0) { | |
1830 | ERR("Snapshot channel failed"); | |
1831 | ret_code = LTTCOMM_CONSUMERD_SNAPSHOT_FAILED; | |
1832 | } | |
10a50311 JD |
1833 | } |
1834 | } | |
9ce5646a | 1835 | health_code_update(); |
6dc3064a DG |
1836 | ret = consumer_send_status_msg(sock, ret_code); |
1837 | if (ret < 0) { | |
1838 | /* Somehow, the session daemon is not responding anymore. */ | |
1839 | goto end_nosignal; | |
1840 | } | |
9ce5646a | 1841 | health_code_update(); |
6dc3064a DG |
1842 | break; |
1843 | } | |
fb83fe64 JD |
1844 | case LTTNG_CONSUMER_DISCARDED_EVENTS: |
1845 | { | |
beb59458 MJ |
1846 | int ret = 0; |
1847 | uint64_t discarded_events; | |
fb83fe64 JD |
1848 | struct lttng_ht_iter iter; |
1849 | struct lttng_ht *ht; | |
1850 | struct lttng_consumer_stream *stream; | |
1851 | uint64_t id = msg.u.discarded_events.session_id; | |
1852 | uint64_t key = msg.u.discarded_events.channel_key; | |
1853 | ||
1854 | DBG("UST consumer discarded events command for session id %" | |
1855 | PRIu64, id); | |
1856 | rcu_read_lock(); | |
1857 | pthread_mutex_lock(&consumer_data.lock); | |
1858 | ||
1859 | ht = consumer_data.stream_list_ht; | |
1860 | ||
1861 | /* | |
1862 | * We only need a reference to the channel, but they are not | |
1863 | * directly indexed, so we just use the first matching stream | |
1864 | * to extract the information we need, we default to 0 if not | |
1865 | * found (no events are dropped if the channel is not yet in | |
1866 | * use). | |
1867 | */ | |
beb59458 | 1868 | discarded_events = 0; |
fb83fe64 JD |
1869 | cds_lfht_for_each_entry_duplicate(ht->ht, |
1870 | ht->hash_fct(&id, lttng_ht_seed), | |
1871 | ht->match_fct, &id, | |
1872 | &iter.iter, stream, node_session_id.node) { | |
1873 | if (stream->chan->key == key) { | |
beb59458 | 1874 | discarded_events = stream->chan->discarded_events; |
fb83fe64 JD |
1875 | break; |
1876 | } | |
1877 | } | |
1878 | pthread_mutex_unlock(&consumer_data.lock); | |
1879 | rcu_read_unlock(); | |
1880 | ||
1881 | DBG("UST consumer discarded events command for session id %" | |
1882 | PRIu64 ", channel key %" PRIu64, id, key); | |
1883 | ||
1884 | health_code_update(); | |
1885 | ||
1886 | /* Send back returned value to session daemon */ | |
beb59458 | 1887 | ret = lttcomm_send_unix_sock(sock, &discarded_events, sizeof(discarded_events)); |
fb83fe64 JD |
1888 | if (ret < 0) { |
1889 | PERROR("send discarded events"); | |
1890 | goto error_fatal; | |
1891 | } | |
1892 | ||
1893 | break; | |
1894 | } | |
1895 | case LTTNG_CONSUMER_LOST_PACKETS: | |
1896 | { | |
9a06e8d4 JG |
1897 | int ret; |
1898 | uint64_t lost_packets; | |
fb83fe64 JD |
1899 | struct lttng_ht_iter iter; |
1900 | struct lttng_ht *ht; | |
1901 | struct lttng_consumer_stream *stream; | |
1902 | uint64_t id = msg.u.lost_packets.session_id; | |
1903 | uint64_t key = msg.u.lost_packets.channel_key; | |
1904 | ||
1905 | DBG("UST consumer lost packets command for session id %" | |
1906 | PRIu64, id); | |
1907 | rcu_read_lock(); | |
1908 | pthread_mutex_lock(&consumer_data.lock); | |
1909 | ||
1910 | ht = consumer_data.stream_list_ht; | |
1911 | ||
1912 | /* | |
1913 | * We only need a reference to the channel, but they are not | |
1914 | * directly indexed, so we just use the first matching stream | |
1915 | * to extract the information we need, we default to 0 if not | |
1916 | * found (no packets lost if the channel is not yet in use). | |
1917 | */ | |
9a06e8d4 | 1918 | lost_packets = 0; |
fb83fe64 JD |
1919 | cds_lfht_for_each_entry_duplicate(ht->ht, |
1920 | ht->hash_fct(&id, lttng_ht_seed), | |
1921 | ht->match_fct, &id, | |
1922 | &iter.iter, stream, node_session_id.node) { | |
1923 | if (stream->chan->key == key) { | |
9a06e8d4 | 1924 | lost_packets = stream->chan->lost_packets; |
fb83fe64 JD |
1925 | break; |
1926 | } | |
1927 | } | |
1928 | pthread_mutex_unlock(&consumer_data.lock); | |
1929 | rcu_read_unlock(); | |
1930 | ||
1931 | DBG("UST consumer lost packets command for session id %" | |
1932 | PRIu64 ", channel key %" PRIu64, id, key); | |
1933 | ||
1934 | health_code_update(); | |
1935 | ||
1936 | /* Send back returned value to session daemon */ | |
9a06e8d4 JG |
1937 | ret = lttcomm_send_unix_sock(sock, &lost_packets, |
1938 | sizeof(lost_packets)); | |
fb83fe64 JD |
1939 | if (ret < 0) { |
1940 | PERROR("send lost packets"); | |
1941 | goto error_fatal; | |
1942 | } | |
1943 | ||
1944 | break; | |
1945 | } | |
b3530820 JG |
1946 | case LTTNG_CONSUMER_SET_CHANNEL_MONITOR_PIPE: |
1947 | { | |
1948 | int channel_monitor_pipe; | |
1949 | ||
1950 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1951 | /* Successfully received the command's type. */ | |
1952 | ret = consumer_send_status_msg(sock, ret_code); | |
1953 | if (ret < 0) { | |
1954 | goto error_fatal; | |
1955 | } | |
1956 | ||
1957 | ret = lttcomm_recv_fds_unix_sock(sock, &channel_monitor_pipe, | |
1958 | 1); | |
1959 | if (ret != sizeof(channel_monitor_pipe)) { | |
1960 | ERR("Failed to receive channel monitor pipe"); | |
1961 | goto error_fatal; | |
1962 | } | |
1963 | ||
1964 | DBG("Received channel monitor pipe (%d)", channel_monitor_pipe); | |
1965 | ret = consumer_timer_thread_set_channel_monitor_pipe( | |
1966 | channel_monitor_pipe); | |
1967 | if (!ret) { | |
1968 | int flags; | |
1969 | ||
1970 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1971 | /* Set the pipe as non-blocking. */ | |
1972 | ret = fcntl(channel_monitor_pipe, F_GETFL, 0); | |
1973 | if (ret == -1) { | |
1974 | PERROR("fcntl get flags of the channel monitoring pipe"); | |
1975 | goto error_fatal; | |
1976 | } | |
1977 | flags = ret; | |
1978 | ||
1979 | ret = fcntl(channel_monitor_pipe, F_SETFL, | |
1980 | flags | O_NONBLOCK); | |
1981 | if (ret == -1) { | |
1982 | PERROR("fcntl set O_NONBLOCK flag of the channel monitoring pipe"); | |
1983 | goto error_fatal; | |
1984 | } | |
1985 | DBG("Channel monitor pipe set as non-blocking"); | |
1986 | } else { | |
1987 | ret_code = LTTCOMM_CONSUMERD_ALREADY_SET; | |
1988 | } | |
1989 | goto end_msg_sessiond; | |
1990 | } | |
b99a8d42 JD |
1991 | case LTTNG_CONSUMER_ROTATE_CHANNEL: |
1992 | { | |
e96d66b4 MD |
1993 | struct lttng_consumer_channel *channel; |
1994 | uint64_t key = msg.u.rotate_channel.key; | |
b99a8d42 | 1995 | |
e96d66b4 MD |
1996 | channel = consumer_find_channel(key); |
1997 | if (!channel) { | |
1998 | DBG("Channel %" PRIu64 " not found", key); | |
1999 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
2000 | } else { | |
2001 | /* | |
2002 | * Sample the rotate position of all the streams in | |
2003 | * this channel. | |
2004 | */ | |
2005 | ret = lttng_consumer_rotate_channel(channel, key, | |
e96d66b4 MD |
2006 | msg.u.rotate_channel.relayd_id, |
2007 | msg.u.rotate_channel.metadata, | |
e96d66b4 MD |
2008 | ctx); |
2009 | if (ret < 0) { | |
2010 | ERR("Rotate channel failed"); | |
2011 | ret_code = LTTCOMM_CONSUMERD_ROTATION_FAIL; | |
2012 | } | |
b99a8d42 | 2013 | |
e96d66b4 MD |
2014 | health_code_update(); |
2015 | } | |
b99a8d42 JD |
2016 | ret = consumer_send_status_msg(sock, ret_code); |
2017 | if (ret < 0) { | |
2018 | /* Somehow, the session daemon is not responding anymore. */ | |
c69b5db6 | 2019 | goto end_rotate_channel_nosignal; |
b99a8d42 JD |
2020 | } |
2021 | ||
2022 | /* | |
2023 | * Rotate the streams that are ready right now. | |
2024 | * FIXME: this is a second consecutive iteration over the | |
2025 | * streams in a channel, there is probably a better way to | |
2026 | * handle this, but it needs to be after the | |
2027 | * consumer_send_status_msg() call. | |
2028 | */ | |
e96d66b4 MD |
2029 | if (channel) { |
2030 | ret = lttng_consumer_rotate_ready_streams( | |
2031 | channel, key, ctx); | |
2032 | if (ret < 0) { | |
2033 | ERR("Rotate channel failed"); | |
2034 | } | |
b99a8d42 JD |
2035 | } |
2036 | break; | |
c69b5db6 JG |
2037 | end_rotate_channel_nosignal: |
2038 | goto end_nosignal; | |
b99a8d42 | 2039 | } |
e5148e25 | 2040 | case LTTNG_CONSUMER_INIT: |
00fb02ac | 2041 | { |
e5148e25 JG |
2042 | ret_code = lttng_consumer_init_command(ctx, |
2043 | msg.u.init.sessiond_uuid); | |
d88744a4 | 2044 | health_code_update(); |
d88744a4 JD |
2045 | ret = consumer_send_status_msg(sock, ret_code); |
2046 | if (ret < 0) { | |
2047 | /* Somehow, the session daemon is not responding anymore. */ | |
2048 | goto end_nosignal; | |
2049 | } | |
2050 | break; | |
2051 | } | |
e5148e25 | 2052 | case LTTNG_CONSUMER_CREATE_TRACE_CHUNK: |
d88744a4 | 2053 | { |
e5148e25 | 2054 | const struct lttng_credentials credentials = { |
0ebdafe0 JG |
2055 | .uid = msg.u.create_trace_chunk.credentials.value.uid, |
2056 | .gid = msg.u.create_trace_chunk.credentials.value.gid, | |
e5148e25 JG |
2057 | }; |
2058 | const bool is_local_trace = | |
2059 | !msg.u.create_trace_chunk.relayd_id.is_set; | |
2060 | const uint64_t relayd_id = | |
2061 | msg.u.create_trace_chunk.relayd_id.value; | |
2062 | const char *chunk_override_name = | |
2063 | *msg.u.create_trace_chunk.override_name ? | |
2064 | msg.u.create_trace_chunk.override_name : | |
2065 | NULL; | |
2066 | LTTNG_OPTIONAL(struct lttng_directory_handle) chunk_directory_handle = | |
2067 | LTTNG_OPTIONAL_INIT; | |
d88744a4 | 2068 | |
e5148e25 JG |
2069 | /* |
2070 | * The session daemon will only provide a chunk directory file | |
2071 | * descriptor for local traces. | |
2072 | */ | |
2073 | if (is_local_trace) { | |
2074 | int chunk_dirfd; | |
19990ed5 | 2075 | |
e5148e25 JG |
2076 | /* Acnowledge the reception of the command. */ |
2077 | ret = consumer_send_status_msg(sock, | |
2078 | LTTCOMM_CONSUMERD_SUCCESS); | |
2079 | if (ret < 0) { | |
2080 | /* Somehow, the session daemon is not responding anymore. */ | |
2081 | goto end_nosignal; | |
2082 | } | |
82528808 | 2083 | |
e5148e25 JG |
2084 | ret = lttcomm_recv_fds_unix_sock(sock, &chunk_dirfd, 1); |
2085 | if (ret != sizeof(chunk_dirfd)) { | |
2086 | ERR("Failed to receive trace chunk directory file descriptor"); | |
2087 | goto error_fatal; | |
2088 | } | |
82528808 | 2089 | |
e5148e25 JG |
2090 | DBG("Received trace chunk directory fd (%d)", |
2091 | chunk_dirfd); | |
2092 | ret = lttng_directory_handle_init_from_dirfd( | |
2093 | &chunk_directory_handle.value, | |
2094 | chunk_dirfd); | |
2095 | if (ret) { | |
2096 | ERR("Failed to initialize chunk directory handle from directory file descriptor"); | |
2097 | if (close(chunk_dirfd)) { | |
2098 | PERROR("Failed to close chunk directory file descriptor"); | |
2099 | } | |
2100 | goto error_fatal; | |
2101 | } | |
2102 | chunk_directory_handle.is_set = true; | |
82528808 JG |
2103 | } |
2104 | ||
e5148e25 JG |
2105 | ret_code = lttng_consumer_create_trace_chunk( |
2106 | !is_local_trace ? &relayd_id : NULL, | |
2107 | msg.u.create_trace_chunk.session_id, | |
2108 | msg.u.create_trace_chunk.chunk_id, | |
0ebdafe0 JG |
2109 | (time_t) msg.u.create_trace_chunk |
2110 | .creation_timestamp, | |
e5148e25 | 2111 | chunk_override_name, |
0ebdafe0 JG |
2112 | msg.u.create_trace_chunk.credentials.is_set ? |
2113 | &credentials : | |
2114 | NULL, | |
e5148e25 JG |
2115 | chunk_directory_handle.is_set ? |
2116 | &chunk_directory_handle.value : | |
2117 | NULL); | |
82528808 | 2118 | |
e5148e25 JG |
2119 | if (chunk_directory_handle.is_set) { |
2120 | lttng_directory_handle_fini( | |
2121 | &chunk_directory_handle.value); | |
d88744a4 | 2122 | } |
e5148e25 | 2123 | goto end_msg_sessiond; |
00fb02ac | 2124 | } |
e5148e25 | 2125 | case LTTNG_CONSUMER_CLOSE_TRACE_CHUNK: |
a1ae2ea5 | 2126 | { |
6bbcff33 JG |
2127 | enum lttng_trace_chunk_command_type close_command = |
2128 | msg.u.close_trace_chunk.close_command.value; | |
e5148e25 JG |
2129 | const uint64_t relayd_id = |
2130 | msg.u.close_trace_chunk.relayd_id.value; | |
41b23598 MD |
2131 | struct lttcomm_consumer_close_trace_chunk_reply reply; |
2132 | char closed_trace_chunk_path[LTTNG_PATH_MAX]; | |
2133 | int ret; | |
e5148e25 JG |
2134 | |
2135 | ret_code = lttng_consumer_close_trace_chunk( | |
2136 | msg.u.close_trace_chunk.relayd_id.is_set ? | |
6bbcff33 JG |
2137 | &relayd_id : |
2138 | NULL, | |
e5148e25 JG |
2139 | msg.u.close_trace_chunk.session_id, |
2140 | msg.u.close_trace_chunk.chunk_id, | |
6bbcff33 JG |
2141 | (time_t) msg.u.close_trace_chunk.close_timestamp, |
2142 | msg.u.close_trace_chunk.close_command.is_set ? | |
2143 | &close_command : | |
41b23598 MD |
2144 | NULL, closed_trace_chunk_path); |
2145 | reply.ret_code = ret_code; | |
2146 | reply.path_length = strlen(closed_trace_chunk_path) + 1; | |
2147 | ret = lttcomm_send_unix_sock(sock, &reply, sizeof(reply)); | |
2148 | if (ret != sizeof(reply)) { | |
2149 | goto error_fatal; | |
2150 | } | |
2151 | ret = lttcomm_send_unix_sock(sock, closed_trace_chunk_path, | |
2152 | reply.path_length); | |
2153 | if (ret != reply.path_length) { | |
2154 | goto error_fatal; | |
2155 | } | |
2156 | goto end_nosignal; | |
a1ae2ea5 | 2157 | } |
e5148e25 | 2158 | case LTTNG_CONSUMER_TRACE_CHUNK_EXISTS: |
fc181d72 | 2159 | { |
e5148e25 JG |
2160 | const uint64_t relayd_id = |
2161 | msg.u.trace_chunk_exists.relayd_id.value; | |
2162 | ||
2163 | ret_code = lttng_consumer_trace_chunk_exists( | |
2164 | msg.u.trace_chunk_exists.relayd_id.is_set ? | |
2165 | &relayd_id : NULL, | |
2166 | msg.u.trace_chunk_exists.session_id, | |
2167 | msg.u.trace_chunk_exists.chunk_id); | |
2168 | goto end_msg_sessiond; | |
fc181d72 | 2169 | } |
3bd1e081 MD |
2170 | default: |
2171 | break; | |
2172 | } | |
3f8e211f | 2173 | |
3bd1e081 | 2174 | end_nosignal: |
4cbc1a04 DG |
2175 | /* |
2176 | * Return 1 to indicate success since the 0 value can be a socket | |
2177 | * shutdown during the recv() or send() call. | |
2178 | */ | |
57377f7d JG |
2179 | ret = 1; |
2180 | goto end; | |
ffe60014 DG |
2181 | |
2182 | end_msg_sessiond: | |
2183 | /* | |
2184 | * The returned value here is not useful since either way we'll return 1 to | |
2185 | * the caller because the session daemon socket management is done | |
2186 | * elsewhere. Returning a negative code or 0 will shutdown the consumer. | |
2187 | */ | |
489f70e9 MD |
2188 | ret = consumer_send_status_msg(sock, ret_code); |
2189 | if (ret < 0) { | |
2190 | goto error_fatal; | |
2191 | } | |
57377f7d JG |
2192 | ret = 1; |
2193 | goto end; | |
9ce5646a | 2194 | |
ffe60014 DG |
2195 | end_channel_error: |
2196 | if (channel) { | |
2197 | /* | |
2198 | * Free channel here since no one has a reference to it. We don't | |
2199 | * free after that because a stream can store this pointer. | |
2200 | */ | |
2201 | destroy_channel(channel); | |
2202 | } | |
2203 | /* We have to send a status channel message indicating an error. */ | |
2204 | ret = consumer_send_status_channel(sock, NULL); | |
2205 | if (ret < 0) { | |
2206 | /* Stop everything if session daemon can not be notified. */ | |
2207 | goto error_fatal; | |
2208 | } | |
57377f7d JG |
2209 | ret = 1; |
2210 | goto end; | |
9ce5646a | 2211 | |
ffe60014 | 2212 | error_fatal: |
ffe60014 | 2213 | /* This will issue a consumer stop. */ |
57377f7d JG |
2214 | ret = -1; |
2215 | goto end; | |
2216 | ||
2217 | end: | |
2218 | rcu_read_unlock(); | |
2219 | health_code_update(); | |
2220 | return ret; | |
3bd1e081 MD |
2221 | } |
2222 | ||
fc6d7a51 JD |
2223 | void lttng_ustctl_flush_buffer(struct lttng_consumer_stream *stream, |
2224 | int producer_active) | |
2225 | { | |
2226 | assert(stream); | |
2227 | assert(stream->ustream); | |
2228 | ||
2229 | ustctl_flush_buffer(stream->ustream, producer_active); | |
2230 | } | |
2231 | ||
ffe60014 | 2232 | /* |
e9404c27 | 2233 | * Take a snapshot for a specific stream. |
ffe60014 DG |
2234 | * |
2235 | * Returns 0 on success, < 0 on error | |
2236 | */ | |
2237 | int lttng_ustconsumer_take_snapshot(struct lttng_consumer_stream *stream) | |
3bd1e081 | 2238 | { |
ffe60014 DG |
2239 | assert(stream); |
2240 | assert(stream->ustream); | |
2241 | ||
2242 | return ustctl_snapshot(stream->ustream); | |
3bd1e081 MD |
2243 | } |
2244 | ||
e9404c27 JG |
2245 | /* |
2246 | * Sample consumed and produced positions for a specific stream. | |
2247 | * | |
2248 | * Returns 0 on success, < 0 on error. | |
2249 | */ | |
2250 | int lttng_ustconsumer_sample_snapshot_positions( | |
2251 | struct lttng_consumer_stream *stream) | |
2252 | { | |
2253 | assert(stream); | |
2254 | assert(stream->ustream); | |
2255 | ||
2256 | return ustctl_snapshot_sample_positions(stream->ustream); | |
2257 | } | |
2258 | ||
ffe60014 DG |
2259 | /* |
2260 | * Get the produced position | |
2261 | * | |
2262 | * Returns 0 on success, < 0 on error | |
2263 | */ | |
2264 | int lttng_ustconsumer_get_produced_snapshot( | |
2265 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
3bd1e081 | 2266 | { |
ffe60014 DG |
2267 | assert(stream); |
2268 | assert(stream->ustream); | |
2269 | assert(pos); | |
7a57cf92 | 2270 | |
ffe60014 DG |
2271 | return ustctl_snapshot_get_produced(stream->ustream, pos); |
2272 | } | |
7a57cf92 | 2273 | |
10a50311 JD |
2274 | /* |
2275 | * Get the consumed position | |
2276 | * | |
2277 | * Returns 0 on success, < 0 on error | |
2278 | */ | |
2279 | int lttng_ustconsumer_get_consumed_snapshot( | |
2280 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
2281 | { | |
2282 | assert(stream); | |
2283 | assert(stream->ustream); | |
2284 | assert(pos); | |
2285 | ||
2286 | return ustctl_snapshot_get_consumed(stream->ustream, pos); | |
2287 | } | |
2288 | ||
84a182ce DG |
2289 | void lttng_ustconsumer_flush_buffer(struct lttng_consumer_stream *stream, |
2290 | int producer) | |
2291 | { | |
2292 | assert(stream); | |
2293 | assert(stream->ustream); | |
2294 | ||
2295 | ustctl_flush_buffer(stream->ustream, producer); | |
2296 | } | |
2297 | ||
2298 | int lttng_ustconsumer_get_current_timestamp( | |
2299 | struct lttng_consumer_stream *stream, uint64_t *ts) | |
2300 | { | |
2301 | assert(stream); | |
2302 | assert(stream->ustream); | |
2303 | assert(ts); | |
2304 | ||
2305 | return ustctl_get_current_timestamp(stream->ustream, ts); | |
2306 | } | |
2307 | ||
fb83fe64 JD |
2308 | int lttng_ustconsumer_get_sequence_number( |
2309 | struct lttng_consumer_stream *stream, uint64_t *seq) | |
2310 | { | |
2311 | assert(stream); | |
2312 | assert(stream->ustream); | |
2313 | assert(seq); | |
2314 | ||
2315 | return ustctl_get_sequence_number(stream->ustream, seq); | |
2316 | } | |
2317 | ||
ffe60014 | 2318 | /* |
0dd01979 | 2319 | * Called when the stream signals the consumer that it has hung up. |
ffe60014 DG |
2320 | */ |
2321 | void lttng_ustconsumer_on_stream_hangup(struct lttng_consumer_stream *stream) | |
2322 | { | |
2323 | assert(stream); | |
2324 | assert(stream->ustream); | |
2c1dd183 | 2325 | |
0dd01979 MD |
2326 | pthread_mutex_lock(&stream->lock); |
2327 | if (!stream->quiescent) { | |
2328 | ustctl_flush_buffer(stream->ustream, 0); | |
2329 | stream->quiescent = true; | |
2330 | } | |
2331 | pthread_mutex_unlock(&stream->lock); | |
ffe60014 DG |
2332 | stream->hangup_flush_done = 1; |
2333 | } | |
ee77a7b0 | 2334 | |
ffe60014 DG |
2335 | void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan) |
2336 | { | |
4628484a MD |
2337 | int i; |
2338 | ||
ffe60014 DG |
2339 | assert(chan); |
2340 | assert(chan->uchan); | |
e5148e25 | 2341 | assert(chan->buffer_credentials.is_set); |
e316aad5 | 2342 | |
ea88ca2a MD |
2343 | if (chan->switch_timer_enabled == 1) { |
2344 | consumer_timer_switch_stop(chan); | |
2345 | } | |
4628484a MD |
2346 | for (i = 0; i < chan->nr_stream_fds; i++) { |
2347 | int ret; | |
2348 | ||
2349 | ret = close(chan->stream_fds[i]); | |
2350 | if (ret) { | |
2351 | PERROR("close"); | |
2352 | } | |
2353 | if (chan->shm_path[0]) { | |
2354 | char shm_path[PATH_MAX]; | |
2355 | ||
2356 | ret = get_stream_shm_path(shm_path, chan->shm_path, i); | |
2357 | if (ret) { | |
2358 | ERR("Cannot get stream shm path"); | |
2359 | } | |
e5148e25 JG |
2360 | ret = run_as_unlink(shm_path, |
2361 | chan->buffer_credentials.value.uid, | |
2362 | chan->buffer_credentials.value.gid); | |
4628484a | 2363 | if (ret) { |
4628484a MD |
2364 | PERROR("unlink %s", shm_path); |
2365 | } | |
2366 | } | |
2367 | } | |
3bd1e081 MD |
2368 | } |
2369 | ||
b83e03c4 MD |
2370 | void lttng_ustconsumer_free_channel(struct lttng_consumer_channel *chan) |
2371 | { | |
2372 | assert(chan); | |
2373 | assert(chan->uchan); | |
e5148e25 | 2374 | assert(chan->buffer_credentials.is_set); |
b83e03c4 MD |
2375 | |
2376 | consumer_metadata_cache_destroy(chan); | |
2377 | ustctl_destroy_channel(chan->uchan); | |
ea853771 JR |
2378 | /* Try to rmdir all directories under shm_path root. */ |
2379 | if (chan->root_shm_path[0]) { | |
602766ec | 2380 | (void) run_as_rmdir_recursive(chan->root_shm_path, |
e5148e25 | 2381 | chan->buffer_credentials.value.uid, |
58ec7253 MD |
2382 | chan->buffer_credentials.value.gid, |
2383 | LTTNG_DIRECTORY_HANDLE_SKIP_NON_EMPTY_FLAG); | |
ea853771 | 2384 | } |
b83e03c4 MD |
2385 | free(chan->stream_fds); |
2386 | } | |
2387 | ||
3bd1e081 MD |
2388 | void lttng_ustconsumer_del_stream(struct lttng_consumer_stream *stream) |
2389 | { | |
ffe60014 DG |
2390 | assert(stream); |
2391 | assert(stream->ustream); | |
d41f73b7 | 2392 | |
ea88ca2a MD |
2393 | if (stream->chan->switch_timer_enabled == 1) { |
2394 | consumer_timer_switch_stop(stream->chan); | |
2395 | } | |
ffe60014 DG |
2396 | ustctl_destroy_stream(stream->ustream); |
2397 | } | |
d41f73b7 | 2398 | |
6d574024 DG |
2399 | int lttng_ustconsumer_get_wakeup_fd(struct lttng_consumer_stream *stream) |
2400 | { | |
2401 | assert(stream); | |
2402 | assert(stream->ustream); | |
2403 | ||
2404 | return ustctl_stream_get_wakeup_fd(stream->ustream); | |
2405 | } | |
2406 | ||
2407 | int lttng_ustconsumer_close_wakeup_fd(struct lttng_consumer_stream *stream) | |
2408 | { | |
2409 | assert(stream); | |
2410 | assert(stream->ustream); | |
2411 | ||
2412 | return ustctl_stream_close_wakeup_fd(stream->ustream); | |
2413 | } | |
2414 | ||
93ec662e | 2415 | static |
6f1177cf | 2416 | void metadata_stream_reset_cache(struct lttng_consumer_stream *stream) |
93ec662e | 2417 | { |
6f1177cf JG |
2418 | DBG("Reset metadata cache of session %" PRIu64, |
2419 | stream->chan->session_id); | |
93ec662e | 2420 | stream->ust_metadata_pushed = 0; |
6f1177cf | 2421 | stream->metadata_version = stream->chan->metadata_cache->version; |
93ec662e JD |
2422 | stream->reset_metadata_flag = 1; |
2423 | } | |
2424 | ||
94d49140 JD |
2425 | /* |
2426 | * Write up to one packet from the metadata cache to the channel. | |
2427 | * | |
2428 | * Returns the number of bytes pushed in the cache, or a negative value | |
2429 | * on error. | |
2430 | */ | |
2431 | static | |
2432 | int commit_one_metadata_packet(struct lttng_consumer_stream *stream) | |
2433 | { | |
2434 | ssize_t write_len; | |
2435 | int ret; | |
2436 | ||
2437 | pthread_mutex_lock(&stream->chan->metadata_cache->lock); | |
c585821b | 2438 | if (stream->chan->metadata_cache->max_offset |
94d49140 JD |
2439 | == stream->ust_metadata_pushed) { |
2440 | ret = 0; | |
2441 | goto end; | |
2442 | } | |
2443 | ||
2444 | write_len = ustctl_write_one_packet_to_channel(stream->chan->uchan, | |
2445 | &stream->chan->metadata_cache->data[stream->ust_metadata_pushed], | |
c585821b | 2446 | stream->chan->metadata_cache->max_offset |
94d49140 JD |
2447 | - stream->ust_metadata_pushed); |
2448 | assert(write_len != 0); | |
2449 | if (write_len < 0) { | |
2450 | ERR("Writing one metadata packet"); | |
8d18bcae | 2451 | ret = write_len; |
94d49140 JD |
2452 | goto end; |
2453 | } | |
2454 | stream->ust_metadata_pushed += write_len; | |
2455 | ||
c585821b | 2456 | assert(stream->chan->metadata_cache->max_offset >= |
94d49140 JD |
2457 | stream->ust_metadata_pushed); |
2458 | ret = write_len; | |
2459 | ||
d367ba54 JG |
2460 | /* |
2461 | * Switch packet (but don't open the next one) on every commit of | |
2462 | * a metadata packet. Since the subbuffer is fully filled (with padding, | |
2463 | * if needed), the stream is "quiescent" after this commit. | |
2464 | */ | |
2465 | ustctl_flush_buffer(stream->ustream, 1); | |
2466 | stream->quiescent = true; | |
94d49140 JD |
2467 | end: |
2468 | pthread_mutex_unlock(&stream->chan->metadata_cache->lock); | |
2469 | return ret; | |
2470 | } | |
2471 | ||
309167d2 | 2472 | |
94d49140 JD |
2473 | /* |
2474 | * Sync metadata meaning request them to the session daemon and snapshot to the | |
2475 | * metadata thread can consumer them. | |
2476 | * | |
c585821b MD |
2477 | * Metadata stream lock is held here, but we need to release it when |
2478 | * interacting with sessiond, else we cause a deadlock with live | |
2479 | * awaiting on metadata to be pushed out. | |
94d49140 | 2480 | * |
1d18f2d9 JG |
2481 | * The RCU read side lock must be held by the caller. |
2482 | * | |
94d49140 JD |
2483 | * Return 0 if new metadatda is available, EAGAIN if the metadata stream |
2484 | * is empty or a negative value on error. | |
2485 | */ | |
2486 | int lttng_ustconsumer_sync_metadata(struct lttng_consumer_local_data *ctx, | |
1d18f2d9 | 2487 | struct lttng_consumer_stream *metadata_stream) |
94d49140 JD |
2488 | { |
2489 | int ret; | |
2490 | int retry = 0; | |
1d18f2d9 | 2491 | struct lttng_consumer_channel *metadata_channel; |
94d49140 JD |
2492 | |
2493 | assert(ctx); | |
1d18f2d9 | 2494 | assert(metadata_stream); |
94d49140 | 2495 | |
1d18f2d9 JG |
2496 | metadata_channel = metadata_stream->chan; |
2497 | pthread_mutex_unlock(&metadata_stream->lock); | |
94d49140 JD |
2498 | /* |
2499 | * Request metadata from the sessiond, but don't wait for the flush | |
2500 | * because we locked the metadata thread. | |
2501 | */ | |
1d18f2d9 JG |
2502 | ret = lttng_ustconsumer_request_metadata(ctx, metadata_channel, 0, 0); |
2503 | pthread_mutex_lock(&metadata_stream->lock); | |
94d49140 JD |
2504 | if (ret < 0) { |
2505 | goto end; | |
2506 | } | |
2507 | ||
1d18f2d9 JG |
2508 | /* |
2509 | * The metadata stream and channel can be deleted while the | |
2510 | * metadata stream lock was released. The streamed is checked | |
2511 | * for deletion before we use it further. | |
2512 | * | |
2513 | * Note that it is safe to access a logically-deleted stream since its | |
2514 | * existence is still guaranteed by the RCU read side lock. However, | |
2515 | * it should no longer be used. The close/deletion of the metadata | |
2516 | * channel and stream already guarantees that all metadata has been | |
2517 | * consumed. Therefore, there is nothing left to do in this function. | |
2518 | */ | |
2519 | if (consumer_stream_is_deleted(metadata_stream)) { | |
2520 | DBG("Metadata stream %" PRIu64 " was deleted during the metadata synchronization", | |
2521 | metadata_stream->key); | |
2522 | ret = 0; | |
2523 | goto end; | |
2524 | } | |
2525 | ||
2526 | ret = commit_one_metadata_packet(metadata_stream); | |
94d49140 JD |
2527 | if (ret <= 0) { |
2528 | goto end; | |
2529 | } else if (ret > 0) { | |
2530 | retry = 1; | |
2531 | } | |
2532 | ||
1d18f2d9 | 2533 | ret = ustctl_snapshot(metadata_stream->ustream); |
94d49140 JD |
2534 | if (ret < 0) { |
2535 | if (errno != EAGAIN) { | |
2536 | ERR("Sync metadata, taking UST snapshot"); | |
2537 | goto end; | |
2538 | } | |
2539 | DBG("No new metadata when syncing them."); | |
2540 | /* No new metadata, exit. */ | |
2541 | ret = ENODATA; | |
2542 | goto end; | |
2543 | } | |
2544 | ||
2545 | /* | |
2546 | * After this flush, we still need to extract metadata. | |
2547 | */ | |
2548 | if (retry) { | |
2549 | ret = EAGAIN; | |
2550 | } | |
2551 | ||
2552 | end: | |
2553 | return ret; | |
2554 | } | |
2555 | ||
02b3d176 DG |
2556 | /* |
2557 | * Return 0 on success else a negative value. | |
2558 | */ | |
2559 | static int notify_if_more_data(struct lttng_consumer_stream *stream, | |
2560 | struct lttng_consumer_local_data *ctx) | |
2561 | { | |
2562 | int ret; | |
2563 | struct ustctl_consumer_stream *ustream; | |
2564 | ||
2565 | assert(stream); | |
2566 | assert(ctx); | |
2567 | ||
2568 | ustream = stream->ustream; | |
2569 | ||
2570 | /* | |
2571 | * First, we are going to check if there is a new subbuffer available | |
2572 | * before reading the stream wait_fd. | |
2573 | */ | |
2574 | /* Get the next subbuffer */ | |
2575 | ret = ustctl_get_next_subbuf(ustream); | |
2576 | if (ret) { | |
2577 | /* No more data found, flag the stream. */ | |
2578 | stream->has_data = 0; | |
2579 | ret = 0; | |
2580 | goto end; | |
2581 | } | |
2582 | ||
5420e5db | 2583 | ret = ustctl_put_subbuf(ustream); |
02b3d176 DG |
2584 | assert(!ret); |
2585 | ||
2586 | /* This stream still has data. Flag it and wake up the data thread. */ | |
2587 | stream->has_data = 1; | |
2588 | ||
2589 | if (stream->monitor && !stream->hangup_flush_done && !ctx->has_wakeup) { | |
2590 | ssize_t writelen; | |
2591 | ||
2592 | writelen = lttng_pipe_write(ctx->consumer_wakeup_pipe, "!", 1); | |
2593 | if (writelen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) { | |
2594 | ret = writelen; | |
2595 | goto end; | |
2596 | } | |
2597 | ||
2598 | /* The wake up pipe has been notified. */ | |
2599 | ctx->has_wakeup = 1; | |
2600 | } | |
2601 | ret = 0; | |
2602 | ||
2603 | end: | |
2604 | return ret; | |
2605 | } | |
2606 | ||
6f1177cf | 2607 | static int consumer_stream_ust_on_wake_up(struct lttng_consumer_stream *stream) |
fb83fe64 | 2608 | { |
6f1177cf | 2609 | int ret = 0; |
fb83fe64 | 2610 | |
fb83fe64 | 2611 | /* |
6f1177cf JG |
2612 | * We can consume the 1 byte written into the wait_fd by |
2613 | * UST. Don't trigger error if we cannot read this one byte | |
2614 | * (read returns 0), or if the error is EAGAIN or EWOULDBLOCK. | |
2615 | * | |
2616 | * This is only done when the stream is monitored by a thread, | |
2617 | * before the flush is done after a hangup and if the stream | |
2618 | * is not flagged with data since there might be nothing to | |
2619 | * consume in the wait fd but still have data available | |
2620 | * flagged by the consumer wake up pipe. | |
fb83fe64 | 2621 | */ |
6f1177cf JG |
2622 | if (stream->monitor && !stream->hangup_flush_done && !stream->has_data) { |
2623 | char dummy; | |
2624 | ssize_t readlen; | |
2625 | ||
2626 | readlen = lttng_read(stream->wait_fd, &dummy, 1); | |
2627 | if (readlen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) { | |
2628 | ret = readlen; | |
2629 | } | |
fb83fe64 | 2630 | } |
fb83fe64 | 2631 | |
6f1177cf JG |
2632 | return ret; |
2633 | } | |
2634 | ||
2635 | static int extract_common_subbuffer_info(struct lttng_consumer_stream *stream, | |
2636 | struct stream_subbuffer *subbuf) | |
2637 | { | |
2638 | int ret; | |
2639 | ||
2640 | ret = ustctl_get_subbuf_size( | |
2641 | stream->ustream, &subbuf->info.data.subbuf_size); | |
2642 | if (ret) { | |
fb83fe64 JD |
2643 | goto end; |
2644 | } | |
6f1177cf JG |
2645 | |
2646 | ret = ustctl_get_padded_subbuf_size( | |
2647 | stream->ustream, &subbuf->info.data.padded_subbuf_size); | |
2648 | if (ret) { | |
2649 | goto end; | |
fb83fe64 | 2650 | } |
fb83fe64 JD |
2651 | |
2652 | end: | |
2653 | return ret; | |
2654 | } | |
2655 | ||
6f1177cf JG |
2656 | static int extract_metadata_subbuffer_info(struct lttng_consumer_stream *stream, |
2657 | struct stream_subbuffer *subbuf) | |
d41f73b7 | 2658 | { |
6f1177cf | 2659 | int ret; |
ffe60014 | 2660 | |
6f1177cf JG |
2661 | ret = extract_common_subbuffer_info(stream, subbuf); |
2662 | if (ret) { | |
2663 | goto end; | |
2664 | } | |
d41f73b7 | 2665 | |
6f1177cf | 2666 | subbuf->info.metadata.version = stream->chan->metadata_cache->version; |
ffe60014 | 2667 | |
6f1177cf JG |
2668 | end: |
2669 | return ret; | |
2670 | } | |
d41f73b7 | 2671 | |
6f1177cf JG |
2672 | static int extract_data_subbuffer_info(struct lttng_consumer_stream *stream, |
2673 | struct stream_subbuffer *subbuf) | |
2674 | { | |
2675 | int ret; | |
c617c0c6 | 2676 | |
6f1177cf JG |
2677 | ret = extract_common_subbuffer_info(stream, subbuf); |
2678 | if (ret) { | |
2679 | goto end; | |
02d02e31 JD |
2680 | } |
2681 | ||
6f1177cf JG |
2682 | ret = ustctl_get_packet_size( |
2683 | stream->ustream, &subbuf->info.data.packet_size); | |
2684 | if (ret < 0) { | |
2685 | PERROR("Failed to get sub-buffer packet size"); | |
2686 | goto end; | |
2687 | } | |
04ef1097 | 2688 | |
6f1177cf JG |
2689 | ret = ustctl_get_content_size( |
2690 | stream->ustream, &subbuf->info.data.content_size); | |
2691 | if (ret < 0) { | |
2692 | PERROR("Failed to get sub-buffer content size"); | |
2693 | goto end; | |
d41f73b7 | 2694 | } |
309167d2 | 2695 | |
6f1177cf JG |
2696 | ret = ustctl_get_timestamp_begin( |
2697 | stream->ustream, &subbuf->info.data.timestamp_begin); | |
2698 | if (ret < 0) { | |
2699 | PERROR("Failed to get sub-buffer begin timestamp"); | |
2700 | goto end; | |
2701 | } | |
fb83fe64 | 2702 | |
6f1177cf JG |
2703 | ret = ustctl_get_timestamp_end( |
2704 | stream->ustream, &subbuf->info.data.timestamp_end); | |
2705 | if (ret < 0) { | |
2706 | PERROR("Failed to get sub-buffer end timestamp"); | |
2707 | goto end; | |
2708 | } | |
2709 | ||
2710 | ret = ustctl_get_events_discarded( | |
2711 | stream->ustream, &subbuf->info.data.events_discarded); | |
2712 | if (ret) { | |
2713 | PERROR("Failed to get sub-buffer events discarded count"); | |
2714 | goto end; | |
2715 | } | |
2716 | ||
2717 | ret = ustctl_get_sequence_number(stream->ustream, | |
2718 | &subbuf->info.data.sequence_number.value); | |
2719 | if (ret) { | |
2720 | /* May not be supported by older LTTng-modules. */ | |
2721 | if (ret != -ENOTTY) { | |
2722 | PERROR("Failed to get sub-buffer sequence number"); | |
2723 | goto end; | |
fb83fe64 | 2724 | } |
1c20f0e2 | 2725 | } else { |
6f1177cf | 2726 | subbuf->info.data.sequence_number.is_set = true; |
309167d2 JD |
2727 | } |
2728 | ||
6f1177cf JG |
2729 | ret = ustctl_get_stream_id( |
2730 | stream->ustream, &subbuf->info.data.stream_id); | |
2731 | if (ret < 0) { | |
2732 | PERROR("Failed to get stream id"); | |
2733 | goto end; | |
2734 | } | |
1d4dfdef | 2735 | |
6f1177cf JG |
2736 | ret = ustctl_get_instance_id(stream->ustream, |
2737 | &subbuf->info.data.stream_instance_id.value); | |
2738 | if (ret) { | |
2739 | /* May not be supported by older LTTng-modules. */ | |
2740 | if (ret != -ENOTTY) { | |
2741 | PERROR("Failed to get stream instance id"); | |
2742 | goto end; | |
2743 | } | |
2744 | } else { | |
2745 | subbuf->info.data.stream_instance_id.is_set = true; | |
2746 | } | |
2747 | end: | |
2748 | return ret; | |
2749 | } | |
1d4dfdef | 2750 | |
6f1177cf JG |
2751 | static int get_next_subbuffer_common(struct lttng_consumer_stream *stream, |
2752 | struct stream_subbuffer *subbuffer) | |
2753 | { | |
2754 | int ret; | |
2755 | const char *addr; | |
1d4dfdef | 2756 | |
6f1177cf JG |
2757 | ret = stream->read_subbuffer_ops.extract_subbuffer_info( |
2758 | stream, subbuffer); | |
2759 | if (ret) { | |
2760 | goto end; | |
2761 | } | |
02d02e31 | 2762 | |
6f1177cf | 2763 | ret = get_current_subbuf_addr(stream, &addr); |
7775df52 | 2764 | if (ret) { |
6f1177cf | 2765 | goto end; |
7775df52 JG |
2766 | } |
2767 | ||
6f1177cf JG |
2768 | subbuffer->buffer.buffer = lttng_buffer_view_init( |
2769 | addr, 0, subbuffer->info.data.padded_subbuf_size); | |
2770 | assert(subbuffer->buffer.buffer.data != NULL); | |
2771 | end: | |
2772 | return ret; | |
2773 | } | |
b770aa7f | 2774 | |
6f1177cf JG |
2775 | static int get_next_subbuffer(struct lttng_consumer_stream *stream, |
2776 | struct stream_subbuffer *subbuffer) | |
2777 | { | |
2778 | int ret; | |
331744e3 | 2779 | |
6f1177cf JG |
2780 | ret = ustctl_get_next_subbuf(stream->ustream); |
2781 | if (ret) { | |
2782 | goto end; | |
02b3d176 DG |
2783 | } |
2784 | ||
6f1177cf JG |
2785 | ret = get_next_subbuffer_common(stream, subbuffer); |
2786 | if (ret) { | |
ab1f27f2 | 2787 | goto end; |
1c20f0e2 | 2788 | } |
6f1177cf JG |
2789 | end: |
2790 | return ret; | |
2791 | } | |
1c20f0e2 | 2792 | |
6f1177cf JG |
2793 | static int get_next_subbuffer_metadata(struct lttng_consumer_stream *stream, |
2794 | struct stream_subbuffer *subbuffer) | |
2795 | { | |
2796 | int ret; | |
8d18bcae JG |
2797 | bool cache_empty; |
2798 | bool got_subbuffer; | |
2799 | bool coherent; | |
2800 | bool buffer_empty; | |
2801 | unsigned long consumed_pos, produced_pos; | |
6f1177cf | 2802 | |
8d18bcae JG |
2803 | do { |
2804 | ret = ustctl_get_next_subbuf(stream->ustream); | |
2805 | if (ret == 0) { | |
2806 | got_subbuffer = true; | |
2807 | } else { | |
2808 | got_subbuffer = false; | |
2809 | if (ret != -EAGAIN) { | |
2810 | /* Fatal error. */ | |
2811 | goto end; | |
2812 | } | |
c585821b MD |
2813 | } |
2814 | ||
8d18bcae JG |
2815 | /* |
2816 | * Determine if the cache is empty and ensure that a sub-buffer | |
2817 | * is made available if the cache is not empty. | |
2818 | */ | |
2819 | if (!got_subbuffer) { | |
2820 | ret = commit_one_metadata_packet(stream); | |
2821 | if (ret < 0 && ret != -ENOBUFS) { | |
2822 | goto end; | |
2823 | } else if (ret == 0) { | |
2824 | /* Not an error, the cache is empty. */ | |
2825 | cache_empty = true; | |
2826 | ret = -ENODATA; | |
2827 | goto end; | |
2828 | } else { | |
2829 | cache_empty = false; | |
2830 | } | |
2831 | } else { | |
2832 | pthread_mutex_lock(&stream->chan->metadata_cache->lock); | |
2833 | cache_empty = stream->chan->metadata_cache->max_offset == | |
2834 | stream->ust_metadata_pushed; | |
2835 | pthread_mutex_unlock(&stream->chan->metadata_cache->lock); | |
94d49140 | 2836 | } |
8d18bcae | 2837 | } while (!got_subbuffer); |
94d49140 | 2838 | |
8d18bcae | 2839 | /* Populate sub-buffer infos and view. */ |
6f1177cf JG |
2840 | ret = get_next_subbuffer_common(stream, subbuffer); |
2841 | if (ret) { | |
2842 | goto end; | |
309167d2 | 2843 | } |
8d18bcae JG |
2844 | |
2845 | ret = lttng_ustconsumer_sample_snapshot_positions(stream); | |
2846 | if (ret < 0) { | |
2847 | /* | |
2848 | * -EAGAIN is not expected since we got a sub-buffer and haven't | |
2849 | * pushed the consumption position yet (on put_next). | |
2850 | */ | |
2851 | PERROR("Failed to take a snapshot of metadata buffer positions"); | |
2852 | goto end; | |
2853 | } | |
2854 | ||
2855 | ret = lttng_ustconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
2856 | if (ret) { | |
2857 | PERROR("Failed to get metadata consumed position"); | |
2858 | goto end; | |
2859 | } | |
2860 | ||
2861 | ret = lttng_ustconsumer_get_produced_snapshot(stream, &produced_pos); | |
2862 | if (ret) { | |
2863 | PERROR("Failed to get metadata produced position"); | |
2864 | goto end; | |
2865 | } | |
2866 | ||
2867 | /* Last sub-buffer of the ring buffer ? */ | |
2868 | buffer_empty = (consumed_pos + stream->max_sb_size) == produced_pos; | |
2869 | ||
2870 | /* | |
2871 | * The sessiond registry lock ensures that coherent units of metadata | |
2872 | * are pushed to the consumer daemon at once. Hence, if a sub-buffer is | |
2873 | * acquired, the cache is empty, and it is the only available sub-buffer | |
2874 | * available, it is safe to assume that it is "coherent". | |
2875 | */ | |
2876 | coherent = got_subbuffer && cache_empty && buffer_empty; | |
2877 | ||
2878 | LTTNG_OPTIONAL_SET(&subbuffer->info.metadata.coherent, coherent); | |
ab1f27f2 | 2879 | end: |
d41f73b7 MD |
2880 | return ret; |
2881 | } | |
2882 | ||
6f1177cf JG |
2883 | static int put_next_subbuffer(struct lttng_consumer_stream *stream, |
2884 | struct stream_subbuffer *subbuffer) | |
2885 | { | |
2886 | const int ret = ustctl_put_next_subbuf(stream->ustream); | |
2887 | ||
2888 | assert(ret == 0); | |
2889 | return ret; | |
2890 | } | |
2891 | ||
2892 | static int signal_metadata(struct lttng_consumer_stream *stream, | |
2893 | struct lttng_consumer_local_data *ctx) | |
2894 | { | |
2895 | return pthread_cond_broadcast(&stream->metadata_rdv) ? -errno : 0; | |
2896 | } | |
2897 | ||
8d18bcae | 2898 | static int lttng_ustconsumer_set_stream_ops( |
6f1177cf JG |
2899 | struct lttng_consumer_stream *stream) |
2900 | { | |
8d18bcae JG |
2901 | int ret = 0; |
2902 | ||
6f1177cf JG |
2903 | stream->read_subbuffer_ops.on_wake_up = consumer_stream_ust_on_wake_up; |
2904 | if (stream->metadata_flag) { | |
2905 | stream->read_subbuffer_ops.get_next_subbuffer = | |
2906 | get_next_subbuffer_metadata; | |
2907 | stream->read_subbuffer_ops.extract_subbuffer_info = | |
2908 | extract_metadata_subbuffer_info; | |
2909 | stream->read_subbuffer_ops.reset_metadata = | |
2910 | metadata_stream_reset_cache; | |
8d18bcae JG |
2911 | if (stream->chan->is_live) { |
2912 | stream->read_subbuffer_ops.on_sleep = signal_metadata; | |
2913 | ret = consumer_stream_enable_metadata_bucketization( | |
2914 | stream); | |
2915 | if (ret) { | |
2916 | goto end; | |
2917 | } | |
2918 | } | |
6f1177cf JG |
2919 | } else { |
2920 | stream->read_subbuffer_ops.get_next_subbuffer = | |
2921 | get_next_subbuffer; | |
2922 | stream->read_subbuffer_ops.extract_subbuffer_info = | |
2923 | extract_data_subbuffer_info; | |
2924 | stream->read_subbuffer_ops.on_sleep = notify_if_more_data; | |
2925 | if (stream->chan->is_live) { | |
2926 | stream->read_subbuffer_ops.send_live_beacon = | |
2927 | consumer_flush_ust_index; | |
2928 | } | |
2929 | } | |
2930 | ||
2931 | stream->read_subbuffer_ops.put_next_subbuffer = put_next_subbuffer; | |
8d18bcae JG |
2932 | end: |
2933 | return ret; | |
6f1177cf JG |
2934 | } |
2935 | ||
ffe60014 DG |
2936 | /* |
2937 | * Called when a stream is created. | |
fe4477ee JD |
2938 | * |
2939 | * Return 0 on success or else a negative value. | |
ffe60014 | 2940 | */ |
d41f73b7 MD |
2941 | int lttng_ustconsumer_on_recv_stream(struct lttng_consumer_stream *stream) |
2942 | { | |
fe4477ee JD |
2943 | int ret; |
2944 | ||
10a50311 JD |
2945 | assert(stream); |
2946 | ||
e5148e25 JG |
2947 | /* |
2948 | * Don't create anything if this is set for streaming or if there is | |
2949 | * no current trace chunk on the parent channel. | |
2950 | */ | |
2951 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor && | |
2952 | stream->chan->trace_chunk) { | |
2953 | ret = consumer_stream_create_output_files(stream, true); | |
2954 | if (ret) { | |
fe4477ee JD |
2955 | goto error; |
2956 | } | |
fe4477ee | 2957 | } |
6f1177cf JG |
2958 | |
2959 | lttng_ustconsumer_set_stream_ops(stream); | |
fe4477ee JD |
2960 | ret = 0; |
2961 | ||
2962 | error: | |
2963 | return ret; | |
d41f73b7 | 2964 | } |
ca22feea DG |
2965 | |
2966 | /* | |
2967 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
2968 | * stream. Consumer data lock MUST be acquired before calling this function |
2969 | * and the stream lock. | |
ca22feea | 2970 | * |
6d805429 | 2971 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
2972 | * data is available for trace viewer reading. |
2973 | */ | |
6d805429 | 2974 | int lttng_ustconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
2975 | { |
2976 | int ret; | |
2977 | ||
2978 | assert(stream); | |
ffe60014 | 2979 | assert(stream->ustream); |
ca22feea | 2980 | |
6d805429 | 2981 | DBG("UST consumer checking data pending"); |
c8f59ee5 | 2982 | |
ca6b395f MD |
2983 | if (stream->endpoint_status != CONSUMER_ENDPOINT_ACTIVE) { |
2984 | ret = 0; | |
2985 | goto end; | |
2986 | } | |
2987 | ||
04ef1097 | 2988 | if (stream->chan->type == CONSUMER_CHANNEL_TYPE_METADATA) { |
e6ee4eab DG |
2989 | uint64_t contiguous, pushed; |
2990 | ||
2991 | /* Ease our life a bit. */ | |
c585821b | 2992 | contiguous = stream->chan->metadata_cache->max_offset; |
e6ee4eab DG |
2993 | pushed = stream->ust_metadata_pushed; |
2994 | ||
04ef1097 MD |
2995 | /* |
2996 | * We can simply check whether all contiguously available data | |
2997 | * has been pushed to the ring buffer, since the push operation | |
2998 | * is performed within get_next_subbuf(), and because both | |
2999 | * get_next_subbuf() and put_next_subbuf() are issued atomically | |
3000 | * thanks to the stream lock within | |
3001 | * lttng_ustconsumer_read_subbuffer(). This basically means that | |
3002 | * whetnever ust_metadata_pushed is incremented, the associated | |
3003 | * metadata has been consumed from the metadata stream. | |
3004 | */ | |
3005 | DBG("UST consumer metadata pending check: contiguous %" PRIu64 " vs pushed %" PRIu64, | |
e6ee4eab | 3006 | contiguous, pushed); |
aa01b94c | 3007 | assert(((int64_t) (contiguous - pushed)) >= 0); |
e6ee4eab | 3008 | if ((contiguous != pushed) || |
6acdf328 | 3009 | (((int64_t) contiguous - pushed) > 0 || contiguous == 0)) { |
04ef1097 MD |
3010 | ret = 1; /* Data is pending */ |
3011 | goto end; | |
3012 | } | |
3013 | } else { | |
3014 | ret = ustctl_get_next_subbuf(stream->ustream); | |
3015 | if (ret == 0) { | |
3016 | /* | |
3017 | * There is still data so let's put back this | |
3018 | * subbuffer. | |
3019 | */ | |
3020 | ret = ustctl_put_subbuf(stream->ustream); | |
3021 | assert(ret == 0); | |
3022 | ret = 1; /* Data is pending */ | |
3023 | goto end; | |
3024 | } | |
ca22feea DG |
3025 | } |
3026 | ||
6d805429 DG |
3027 | /* Data is NOT pending so ready to be read. */ |
3028 | ret = 0; | |
ca22feea | 3029 | |
6efae65e DG |
3030 | end: |
3031 | return ret; | |
ca22feea | 3032 | } |
d88aee68 | 3033 | |
6d574024 DG |
3034 | /* |
3035 | * Stop a given metadata channel timer if enabled and close the wait fd which | |
3036 | * is the poll pipe of the metadata stream. | |
3037 | * | |
cb187b25 | 3038 | * This MUST be called with the metadata channel lock acquired. |
6d574024 DG |
3039 | */ |
3040 | void lttng_ustconsumer_close_metadata(struct lttng_consumer_channel *metadata) | |
3041 | { | |
3042 | int ret; | |
3043 | ||
3044 | assert(metadata); | |
3045 | assert(metadata->type == CONSUMER_CHANNEL_TYPE_METADATA); | |
3046 | ||
3047 | DBG("Closing metadata channel key %" PRIu64, metadata->key); | |
3048 | ||
3049 | if (metadata->switch_timer_enabled == 1) { | |
3050 | consumer_timer_switch_stop(metadata); | |
3051 | } | |
3052 | ||
3053 | if (!metadata->metadata_stream) { | |
3054 | goto end; | |
3055 | } | |
3056 | ||
3057 | /* | |
3058 | * Closing write side so the thread monitoring the stream wakes up if any | |
3059 | * and clean the metadata stream. | |
3060 | */ | |
3061 | if (metadata->metadata_stream->ust_metadata_poll_pipe[1] >= 0) { | |
3062 | ret = close(metadata->metadata_stream->ust_metadata_poll_pipe[1]); | |
3063 | if (ret < 0) { | |
3064 | PERROR("closing metadata pipe write side"); | |
3065 | } | |
3066 | metadata->metadata_stream->ust_metadata_poll_pipe[1] = -1; | |
3067 | } | |
3068 | ||
3069 | end: | |
3070 | return; | |
3071 | } | |
3072 | ||
d88aee68 DG |
3073 | /* |
3074 | * Close every metadata stream wait fd of the metadata hash table. This | |
3075 | * function MUST be used very carefully so not to run into a race between the | |
3076 | * metadata thread handling streams and this function closing their wait fd. | |
3077 | * | |
3078 | * For UST, this is used when the session daemon hangs up. Its the metadata | |
3079 | * producer so calling this is safe because we are assured that no state change | |
3080 | * can occur in the metadata thread for the streams in the hash table. | |
3081 | */ | |
6d574024 | 3082 | void lttng_ustconsumer_close_all_metadata(struct lttng_ht *metadata_ht) |
d88aee68 | 3083 | { |
d88aee68 DG |
3084 | struct lttng_ht_iter iter; |
3085 | struct lttng_consumer_stream *stream; | |
3086 | ||
3087 | assert(metadata_ht); | |
3088 | assert(metadata_ht->ht); | |
3089 | ||
3090 | DBG("UST consumer closing all metadata streams"); | |
3091 | ||
3092 | rcu_read_lock(); | |
3093 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, | |
3094 | node.node) { | |
9ce5646a MD |
3095 | |
3096 | health_code_update(); | |
3097 | ||
be2b50c7 | 3098 | pthread_mutex_lock(&stream->chan->lock); |
6d574024 | 3099 | lttng_ustconsumer_close_metadata(stream->chan); |
be2b50c7 DG |
3100 | pthread_mutex_unlock(&stream->chan->lock); |
3101 | ||
d88aee68 DG |
3102 | } |
3103 | rcu_read_unlock(); | |
3104 | } | |
d8ef542d MD |
3105 | |
3106 | void lttng_ustconsumer_close_stream_wakeup(struct lttng_consumer_stream *stream) | |
3107 | { | |
3108 | int ret; | |
3109 | ||
3110 | ret = ustctl_stream_close_wakeup_fd(stream->ustream); | |
3111 | if (ret < 0) { | |
3112 | ERR("Unable to close wakeup fd"); | |
3113 | } | |
3114 | } | |
331744e3 | 3115 | |
f666ae70 MD |
3116 | /* |
3117 | * Please refer to consumer-timer.c before adding any lock within this | |
3118 | * function or any of its callees. Timers have a very strict locking | |
3119 | * semantic with respect to teardown. Failure to respect this semantic | |
3120 | * introduces deadlocks. | |
c585821b MD |
3121 | * |
3122 | * DON'T hold the metadata lock when calling this function, else this | |
3123 | * can cause deadlock involving consumer awaiting for metadata to be | |
3124 | * pushed out due to concurrent interaction with the session daemon. | |
f666ae70 | 3125 | */ |
331744e3 | 3126 | int lttng_ustconsumer_request_metadata(struct lttng_consumer_local_data *ctx, |
94d49140 | 3127 | struct lttng_consumer_channel *channel, int timer, int wait) |
331744e3 JD |
3128 | { |
3129 | struct lttcomm_metadata_request_msg request; | |
3130 | struct lttcomm_consumer_msg msg; | |
0c759fc9 | 3131 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
93ec662e | 3132 | uint64_t len, key, offset, version; |
331744e3 JD |
3133 | int ret; |
3134 | ||
3135 | assert(channel); | |
3136 | assert(channel->metadata_cache); | |
3137 | ||
53efb85a MD |
3138 | memset(&request, 0, sizeof(request)); |
3139 | ||
331744e3 JD |
3140 | /* send the metadata request to sessiond */ |
3141 | switch (consumer_data.type) { | |
3142 | case LTTNG_CONSUMER64_UST: | |
3143 | request.bits_per_long = 64; | |
3144 | break; | |
3145 | case LTTNG_CONSUMER32_UST: | |
3146 | request.bits_per_long = 32; | |
3147 | break; | |
3148 | default: | |
3149 | request.bits_per_long = 0; | |
3150 | break; | |
3151 | } | |
3152 | ||
3153 | request.session_id = channel->session_id; | |
1950109e | 3154 | request.session_id_per_pid = channel->session_id_per_pid; |
567eb353 DG |
3155 | /* |
3156 | * Request the application UID here so the metadata of that application can | |
3157 | * be sent back. The channel UID corresponds to the user UID of the session | |
3158 | * used for the rights on the stream file(s). | |
3159 | */ | |
3160 | request.uid = channel->ust_app_uid; | |
331744e3 | 3161 | request.key = channel->key; |
567eb353 | 3162 | |
1950109e | 3163 | DBG("Sending metadata request to sessiond, session id %" PRIu64 |
3e25d926 | 3164 | ", per-pid %" PRIu64 ", app UID %u and channel key %" PRIu64, |
567eb353 DG |
3165 | request.session_id, request.session_id_per_pid, request.uid, |
3166 | request.key); | |
331744e3 | 3167 | |
75d83e50 | 3168 | pthread_mutex_lock(&ctx->metadata_socket_lock); |
9ce5646a MD |
3169 | |
3170 | health_code_update(); | |
3171 | ||
331744e3 JD |
3172 | ret = lttcomm_send_unix_sock(ctx->consumer_metadata_socket, &request, |
3173 | sizeof(request)); | |
3174 | if (ret < 0) { | |
3175 | ERR("Asking metadata to sessiond"); | |
3176 | goto end; | |
3177 | } | |
3178 | ||
9ce5646a MD |
3179 | health_code_update(); |
3180 | ||
331744e3 JD |
3181 | /* Receive the metadata from sessiond */ |
3182 | ret = lttcomm_recv_unix_sock(ctx->consumer_metadata_socket, &msg, | |
3183 | sizeof(msg)); | |
3184 | if (ret != sizeof(msg)) { | |
8fd623e0 | 3185 | DBG("Consumer received unexpected message size %d (expects %zu)", |
331744e3 JD |
3186 | ret, sizeof(msg)); |
3187 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); | |
3188 | /* | |
3189 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
3190 | * since the caller handles this. | |
3191 | */ | |
3192 | goto end; | |
3193 | } | |
3194 | ||
9ce5646a MD |
3195 | health_code_update(); |
3196 | ||
331744e3 JD |
3197 | if (msg.cmd_type == LTTNG_ERR_UND) { |
3198 | /* No registry found */ | |
3199 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, | |
3200 | ret_code); | |
3201 | ret = 0; | |
3202 | goto end; | |
3203 | } else if (msg.cmd_type != LTTNG_CONSUMER_PUSH_METADATA) { | |
3204 | ERR("Unexpected cmd_type received %d", msg.cmd_type); | |
3205 | ret = -1; | |
3206 | goto end; | |
3207 | } | |
3208 | ||
3209 | len = msg.u.push_metadata.len; | |
3210 | key = msg.u.push_metadata.key; | |
3211 | offset = msg.u.push_metadata.target_offset; | |
93ec662e | 3212 | version = msg.u.push_metadata.version; |
331744e3 JD |
3213 | |
3214 | assert(key == channel->key); | |
3215 | if (len == 0) { | |
3216 | DBG("No new metadata to receive for key %" PRIu64, key); | |
3217 | } | |
3218 | ||
9ce5646a MD |
3219 | health_code_update(); |
3220 | ||
331744e3 JD |
3221 | /* Tell session daemon we are ready to receive the metadata. */ |
3222 | ret = consumer_send_status_msg(ctx->consumer_metadata_socket, | |
0c759fc9 | 3223 | LTTCOMM_CONSUMERD_SUCCESS); |
331744e3 JD |
3224 | if (ret < 0 || len == 0) { |
3225 | /* | |
3226 | * Somehow, the session daemon is not responding anymore or there is | |
3227 | * nothing to receive. | |
3228 | */ | |
3229 | goto end; | |
3230 | } | |
3231 | ||
9ce5646a MD |
3232 | health_code_update(); |
3233 | ||
1eb682be | 3234 | ret = lttng_ustconsumer_recv_metadata(ctx->consumer_metadata_socket, |
93ec662e | 3235 | key, offset, len, version, channel, timer, wait); |
1eb682be | 3236 | if (ret >= 0) { |
f2a444f1 DG |
3237 | /* |
3238 | * Only send the status msg if the sessiond is alive meaning a positive | |
3239 | * ret code. | |
3240 | */ | |
1eb682be | 3241 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, ret); |
f2a444f1 | 3242 | } |
331744e3 JD |
3243 | ret = 0; |
3244 | ||
3245 | end: | |
9ce5646a MD |
3246 | health_code_update(); |
3247 | ||
75d83e50 | 3248 | pthread_mutex_unlock(&ctx->metadata_socket_lock); |
331744e3 JD |
3249 | return ret; |
3250 | } | |
70190e1c DG |
3251 | |
3252 | /* | |
3253 | * Return the ustctl call for the get stream id. | |
3254 | */ | |
3255 | int lttng_ustconsumer_get_stream_id(struct lttng_consumer_stream *stream, | |
3256 | uint64_t *stream_id) | |
3257 | { | |
3258 | assert(stream); | |
3259 | assert(stream_id); | |
3260 | ||
3261 | return ustctl_get_stream_id(stream->ustream, stream_id); | |
3262 | } |