Commit | Line | Data |
---|---|---|
3bd1e081 MD |
1 | /* |
2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> | |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
b3530820 | 4 | * Copyright (C) 2017 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
3bd1e081 | 5 | * |
d14d33bf AM |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License, version 2 only, | |
8 | * as published by the Free Software Foundation. | |
3bd1e081 MD |
9 | * |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
d14d33bf AM |
15 | * You should have received a copy of the GNU General Public License along |
16 | * with this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
3bd1e081 MD |
18 | */ |
19 | ||
6c1c0768 | 20 | #define _LGPL_SOURCE |
3bd1e081 | 21 | #include <assert.h> |
f02e1e8a | 22 | #include <lttng/ust-ctl.h> |
3bd1e081 MD |
23 | #include <poll.h> |
24 | #include <pthread.h> | |
25 | #include <stdlib.h> | |
26 | #include <string.h> | |
27 | #include <sys/mman.h> | |
28 | #include <sys/socket.h> | |
dbb5dfe6 | 29 | #include <sys/stat.h> |
3bd1e081 | 30 | #include <sys/types.h> |
77c7c900 | 31 | #include <inttypes.h> |
3bd1e081 | 32 | #include <unistd.h> |
ffe60014 | 33 | #include <urcu/list.h> |
331744e3 | 34 | #include <signal.h> |
02d02e31 | 35 | #include <stdbool.h> |
0857097f | 36 | |
51a9e1c7 | 37 | #include <bin/lttng-consumerd/health-consumerd.h> |
990570ed | 38 | #include <common/common.h> |
10a8a223 | 39 | #include <common/sessiond-comm/sessiond-comm.h> |
00e2e675 | 40 | #include <common/relayd/relayd.h> |
dbb5dfe6 | 41 | #include <common/compat/fcntl.h> |
f263b7fd | 42 | #include <common/compat/endian.h> |
c8fea79c JR |
43 | #include <common/consumer/consumer-metadata-cache.h> |
44 | #include <common/consumer/consumer-stream.h> | |
45 | #include <common/consumer/consumer-timer.h> | |
fe4477ee | 46 | #include <common/utils.h> |
309167d2 | 47 | #include <common/index/index.h> |
10a8a223 DG |
48 | |
49 | #include "ust-consumer.h" | |
3bd1e081 | 50 | |
45863397 | 51 | #define INT_MAX_STR_LEN 12 /* includes \0 */ |
4628484a | 52 | |
3bd1e081 MD |
53 | extern struct lttng_consumer_global_data consumer_data; |
54 | extern int consumer_poll_timeout; | |
3bd1e081 MD |
55 | |
56 | /* | |
ffe60014 DG |
57 | * Free channel object and all streams associated with it. This MUST be used |
58 | * only and only if the channel has _NEVER_ been added to the global channel | |
59 | * hash table. | |
3bd1e081 | 60 | */ |
ffe60014 | 61 | static void destroy_channel(struct lttng_consumer_channel *channel) |
3bd1e081 | 62 | { |
ffe60014 DG |
63 | struct lttng_consumer_stream *stream, *stmp; |
64 | ||
65 | assert(channel); | |
66 | ||
67 | DBG("UST consumer cleaning stream list"); | |
68 | ||
69 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
70 | send_node) { | |
9ce5646a MD |
71 | |
72 | health_code_update(); | |
73 | ||
ffe60014 DG |
74 | cds_list_del(&stream->send_node); |
75 | ustctl_destroy_stream(stream->ustream); | |
e5148e25 | 76 | lttng_trace_chunk_put(stream->trace_chunk); |
ffe60014 DG |
77 | free(stream); |
78 | } | |
79 | ||
80 | /* | |
81 | * If a channel is available meaning that was created before the streams | |
82 | * were, delete it. | |
83 | */ | |
84 | if (channel->uchan) { | |
85 | lttng_ustconsumer_del_channel(channel); | |
b83e03c4 | 86 | lttng_ustconsumer_free_channel(channel); |
ffe60014 DG |
87 | } |
88 | free(channel); | |
89 | } | |
3bd1e081 MD |
90 | |
91 | /* | |
ffe60014 | 92 | * Add channel to internal consumer state. |
3bd1e081 | 93 | * |
ffe60014 | 94 | * Returns 0 on success or else a negative value. |
3bd1e081 | 95 | */ |
ffe60014 DG |
96 | static int add_channel(struct lttng_consumer_channel *channel, |
97 | struct lttng_consumer_local_data *ctx) | |
3bd1e081 MD |
98 | { |
99 | int ret = 0; | |
100 | ||
ffe60014 DG |
101 | assert(channel); |
102 | assert(ctx); | |
103 | ||
104 | if (ctx->on_recv_channel != NULL) { | |
105 | ret = ctx->on_recv_channel(channel); | |
106 | if (ret == 0) { | |
d8ef542d | 107 | ret = consumer_add_channel(channel, ctx); |
ffe60014 DG |
108 | } else if (ret < 0) { |
109 | /* Most likely an ENOMEM. */ | |
110 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
111 | goto error; | |
112 | } | |
113 | } else { | |
d8ef542d | 114 | ret = consumer_add_channel(channel, ctx); |
3bd1e081 MD |
115 | } |
116 | ||
d88aee68 | 117 | DBG("UST consumer channel added (key: %" PRIu64 ")", channel->key); |
ffe60014 DG |
118 | |
119 | error: | |
3bd1e081 MD |
120 | return ret; |
121 | } | |
122 | ||
123 | /* | |
ffe60014 DG |
124 | * Allocate and return a consumer channel object. |
125 | */ | |
126 | static struct lttng_consumer_channel *allocate_channel(uint64_t session_id, | |
e5148e25 | 127 | const uint64_t *chunk_id, const char *pathname, const char *name, |
da009f2c | 128 | uint64_t relayd_id, uint64_t key, enum lttng_event_output output, |
2bba9e53 | 129 | uint64_t tracefile_size, uint64_t tracefile_count, |
ecc48a90 | 130 | uint64_t session_id_per_pid, unsigned int monitor, |
d7ba1388 | 131 | unsigned int live_timer_interval, |
3d071855 | 132 | const char *root_shm_path, const char *shm_path) |
ffe60014 DG |
133 | { |
134 | assert(pathname); | |
135 | assert(name); | |
136 | ||
e5148e25 JG |
137 | return consumer_allocate_channel(key, session_id, chunk_id, pathname, |
138 | name, relayd_id, output, tracefile_size, | |
d7ba1388 | 139 | tracefile_count, session_id_per_pid, monitor, |
3d071855 | 140 | live_timer_interval, root_shm_path, shm_path); |
ffe60014 DG |
141 | } |
142 | ||
143 | /* | |
144 | * Allocate and return a consumer stream object. If _alloc_ret is not NULL, the | |
145 | * error value if applicable is set in it else it is kept untouched. | |
3bd1e081 | 146 | * |
ffe60014 | 147 | * Return NULL on error else the newly allocated stream object. |
3bd1e081 | 148 | */ |
ffe60014 DG |
149 | static struct lttng_consumer_stream *allocate_stream(int cpu, int key, |
150 | struct lttng_consumer_channel *channel, | |
e5148e25 | 151 | struct lttng_consumer_local_data *ctx, int *_alloc_ret) |
ffe60014 DG |
152 | { |
153 | int alloc_ret; | |
154 | struct lttng_consumer_stream *stream = NULL; | |
155 | ||
156 | assert(channel); | |
157 | assert(ctx); | |
158 | ||
159 | stream = consumer_allocate_stream(channel->key, | |
160 | key, | |
ffe60014 | 161 | channel->name, |
ffe60014 DG |
162 | channel->relayd_id, |
163 | channel->session_id, | |
e5148e25 | 164 | channel->trace_chunk, |
ffe60014 DG |
165 | cpu, |
166 | &alloc_ret, | |
4891ece8 | 167 | channel->type, |
e5148e25 | 168 | channel->monitor); |
ffe60014 DG |
169 | if (stream == NULL) { |
170 | switch (alloc_ret) { | |
171 | case -ENOENT: | |
172 | /* | |
173 | * We could not find the channel. Can happen if cpu hotplug | |
174 | * happens while tearing down. | |
175 | */ | |
176 | DBG3("Could not find channel"); | |
177 | break; | |
178 | case -ENOMEM: | |
179 | case -EINVAL: | |
180 | default: | |
181 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
182 | break; | |
183 | } | |
184 | goto error; | |
185 | } | |
186 | ||
d9a2e16e | 187 | consumer_stream_update_channel_attributes(stream, channel); |
ffe60014 DG |
188 | stream->chan = channel; |
189 | ||
190 | error: | |
191 | if (_alloc_ret) { | |
192 | *_alloc_ret = alloc_ret; | |
193 | } | |
194 | return stream; | |
195 | } | |
196 | ||
197 | /* | |
198 | * Send the given stream pointer to the corresponding thread. | |
199 | * | |
200 | * Returns 0 on success else a negative value. | |
201 | */ | |
202 | static int send_stream_to_thread(struct lttng_consumer_stream *stream, | |
203 | struct lttng_consumer_local_data *ctx) | |
204 | { | |
dae10966 DG |
205 | int ret; |
206 | struct lttng_pipe *stream_pipe; | |
ffe60014 DG |
207 | |
208 | /* Get the right pipe where the stream will be sent. */ | |
209 | if (stream->metadata_flag) { | |
66d583dc | 210 | consumer_add_metadata_stream(stream); |
dae10966 | 211 | stream_pipe = ctx->consumer_metadata_pipe; |
ffe60014 | 212 | } else { |
66d583dc | 213 | consumer_add_data_stream(stream); |
dae10966 | 214 | stream_pipe = ctx->consumer_data_pipe; |
ffe60014 DG |
215 | } |
216 | ||
5ab66908 MD |
217 | /* |
218 | * From this point on, the stream's ownership has been moved away from | |
a8086cf4 JR |
219 | * the channel and it becomes globally visible. Hence, remove it from |
220 | * the local stream list to prevent the stream from being both local and | |
221 | * global. | |
5ab66908 MD |
222 | */ |
223 | stream->globally_visible = 1; | |
a8086cf4 | 224 | cds_list_del(&stream->send_node); |
5ab66908 | 225 | |
dae10966 | 226 | ret = lttng_pipe_write(stream_pipe, &stream, sizeof(stream)); |
ffe60014 | 227 | if (ret < 0) { |
dae10966 DG |
228 | ERR("Consumer write %s stream to pipe %d", |
229 | stream->metadata_flag ? "metadata" : "data", | |
230 | lttng_pipe_get_writefd(stream_pipe)); | |
5ab66908 MD |
231 | if (stream->metadata_flag) { |
232 | consumer_del_stream_for_metadata(stream); | |
233 | } else { | |
234 | consumer_del_stream_for_data(stream); | |
235 | } | |
a8086cf4 | 236 | goto error; |
ffe60014 | 237 | } |
a8086cf4 | 238 | |
5ab66908 | 239 | error: |
ffe60014 DG |
240 | return ret; |
241 | } | |
242 | ||
4628484a MD |
243 | static |
244 | int get_stream_shm_path(char *stream_shm_path, const char *shm_path, int cpu) | |
245 | { | |
45863397 | 246 | char cpu_nr[INT_MAX_STR_LEN]; /* int max len */ |
4628484a MD |
247 | int ret; |
248 | ||
249 | strncpy(stream_shm_path, shm_path, PATH_MAX); | |
250 | stream_shm_path[PATH_MAX - 1] = '\0'; | |
45863397 | 251 | ret = snprintf(cpu_nr, INT_MAX_STR_LEN, "%i", cpu); |
67f8cb8d MD |
252 | if (ret < 0) { |
253 | PERROR("snprintf"); | |
4628484a MD |
254 | goto end; |
255 | } | |
256 | strncat(stream_shm_path, cpu_nr, | |
257 | PATH_MAX - strlen(stream_shm_path) - 1); | |
258 | ret = 0; | |
259 | end: | |
260 | return ret; | |
261 | } | |
262 | ||
d88aee68 DG |
263 | /* |
264 | * Create streams for the given channel using liblttng-ust-ctl. | |
e5148e25 | 265 | * The channel lock must be acquired by the caller. |
d88aee68 DG |
266 | * |
267 | * Return 0 on success else a negative value. | |
268 | */ | |
ffe60014 | 269 | static int create_ust_streams(struct lttng_consumer_channel *channel, |
e5148e25 | 270 | struct lttng_consumer_local_data *ctx) |
ffe60014 DG |
271 | { |
272 | int ret, cpu = 0; | |
273 | struct ustctl_consumer_stream *ustream; | |
274 | struct lttng_consumer_stream *stream; | |
e5148e25 | 275 | pthread_mutex_t *current_stream_lock = NULL; |
ffe60014 DG |
276 | |
277 | assert(channel); | |
278 | assert(ctx); | |
279 | ||
280 | /* | |
281 | * While a stream is available from ustctl. When NULL is returned, we've | |
282 | * reached the end of the possible stream for the channel. | |
283 | */ | |
284 | while ((ustream = ustctl_create_stream(channel->uchan, cpu))) { | |
285 | int wait_fd; | |
04ef1097 | 286 | int ust_metadata_pipe[2]; |
ffe60014 | 287 | |
9ce5646a MD |
288 | health_code_update(); |
289 | ||
04ef1097 MD |
290 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && channel->monitor) { |
291 | ret = utils_create_pipe_cloexec_nonblock(ust_metadata_pipe); | |
292 | if (ret < 0) { | |
293 | ERR("Create ust metadata poll pipe"); | |
294 | goto error; | |
295 | } | |
296 | wait_fd = ust_metadata_pipe[0]; | |
297 | } else { | |
298 | wait_fd = ustctl_stream_get_wait_fd(ustream); | |
299 | } | |
ffe60014 DG |
300 | |
301 | /* Allocate consumer stream object. */ | |
e5148e25 | 302 | stream = allocate_stream(cpu, wait_fd, channel, ctx, &ret); |
ffe60014 DG |
303 | if (!stream) { |
304 | goto error_alloc; | |
305 | } | |
306 | stream->ustream = ustream; | |
307 | /* | |
308 | * Store it so we can save multiple function calls afterwards since | |
309 | * this value is used heavily in the stream threads. This is UST | |
310 | * specific so this is why it's done after allocation. | |
311 | */ | |
312 | stream->wait_fd = wait_fd; | |
313 | ||
b31398bb DG |
314 | /* |
315 | * Increment channel refcount since the channel reference has now been | |
316 | * assigned in the allocation process above. | |
317 | */ | |
10a50311 JD |
318 | if (stream->chan->monitor) { |
319 | uatomic_inc(&stream->chan->refcount); | |
320 | } | |
b31398bb | 321 | |
e5148e25 JG |
322 | pthread_mutex_lock(&stream->lock); |
323 | current_stream_lock = &stream->lock; | |
ffe60014 DG |
324 | /* |
325 | * Order is important this is why a list is used. On error, the caller | |
326 | * should clean this list. | |
327 | */ | |
328 | cds_list_add_tail(&stream->send_node, &channel->streams.head); | |
329 | ||
330 | ret = ustctl_get_max_subbuf_size(stream->ustream, | |
331 | &stream->max_sb_size); | |
332 | if (ret < 0) { | |
333 | ERR("ustctl_get_max_subbuf_size failed for stream %s", | |
334 | stream->name); | |
335 | goto error; | |
336 | } | |
337 | ||
338 | /* Do actions once stream has been received. */ | |
339 | if (ctx->on_recv_stream) { | |
340 | ret = ctx->on_recv_stream(stream); | |
341 | if (ret < 0) { | |
342 | goto error; | |
343 | } | |
344 | } | |
345 | ||
d88aee68 | 346 | DBG("UST consumer add stream %s (key: %" PRIu64 ") with relayd id %" PRIu64, |
ffe60014 DG |
347 | stream->name, stream->key, stream->relayd_stream_id); |
348 | ||
349 | /* Set next CPU stream. */ | |
350 | channel->streams.count = ++cpu; | |
d88aee68 DG |
351 | |
352 | /* Keep stream reference when creating metadata. */ | |
353 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) { | |
354 | channel->metadata_stream = stream; | |
8de4f941 JG |
355 | if (channel->monitor) { |
356 | /* Set metadata poll pipe if we created one */ | |
357 | memcpy(stream->ust_metadata_poll_pipe, | |
358 | ust_metadata_pipe, | |
359 | sizeof(ust_metadata_pipe)); | |
360 | } | |
d88aee68 | 361 | } |
e5148e25 JG |
362 | pthread_mutex_unlock(&stream->lock); |
363 | current_stream_lock = NULL; | |
ffe60014 DG |
364 | } |
365 | ||
366 | return 0; | |
367 | ||
368 | error: | |
369 | error_alloc: | |
e5148e25 JG |
370 | if (current_stream_lock) { |
371 | pthread_mutex_unlock(current_stream_lock); | |
372 | } | |
ffe60014 DG |
373 | return ret; |
374 | } | |
375 | ||
4628484a MD |
376 | /* |
377 | * create_posix_shm is never called concurrently within a process. | |
378 | */ | |
379 | static | |
380 | int create_posix_shm(void) | |
381 | { | |
382 | char tmp_name[NAME_MAX]; | |
383 | int shmfd, ret; | |
384 | ||
385 | ret = snprintf(tmp_name, NAME_MAX, "/ust-shm-consumer-%d", getpid()); | |
386 | if (ret < 0) { | |
387 | PERROR("snprintf"); | |
388 | return -1; | |
389 | } | |
390 | /* | |
391 | * Allocate shm, and immediately unlink its shm oject, keeping | |
392 | * only the file descriptor as a reference to the object. | |
393 | * We specifically do _not_ use the / at the beginning of the | |
394 | * pathname so that some OS implementations can keep it local to | |
395 | * the process (POSIX leaves this implementation-defined). | |
396 | */ | |
397 | shmfd = shm_open(tmp_name, O_CREAT | O_EXCL | O_RDWR, 0700); | |
398 | if (shmfd < 0) { | |
399 | PERROR("shm_open"); | |
400 | goto error_shm_open; | |
401 | } | |
402 | ret = shm_unlink(tmp_name); | |
403 | if (ret < 0 && errno != ENOENT) { | |
404 | PERROR("shm_unlink"); | |
405 | goto error_shm_release; | |
406 | } | |
407 | return shmfd; | |
408 | ||
409 | error_shm_release: | |
410 | ret = close(shmfd); | |
411 | if (ret) { | |
412 | PERROR("close"); | |
413 | } | |
414 | error_shm_open: | |
415 | return -1; | |
416 | } | |
417 | ||
e5148e25 JG |
418 | static int open_ust_stream_fd(struct lttng_consumer_channel *channel, int cpu, |
419 | const struct lttng_credentials *session_credentials) | |
4628484a MD |
420 | { |
421 | char shm_path[PATH_MAX]; | |
422 | int ret; | |
423 | ||
424 | if (!channel->shm_path[0]) { | |
425 | return create_posix_shm(); | |
426 | } | |
427 | ret = get_stream_shm_path(shm_path, channel->shm_path, cpu); | |
428 | if (ret) { | |
429 | goto error_shm_path; | |
430 | } | |
431 | return run_as_open(shm_path, | |
432 | O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR, | |
e5148e25 | 433 | session_credentials->uid, session_credentials->gid); |
4628484a MD |
434 | |
435 | error_shm_path: | |
436 | return -1; | |
437 | } | |
438 | ||
ffe60014 DG |
439 | /* |
440 | * Create an UST channel with the given attributes and send it to the session | |
441 | * daemon using the ust ctl API. | |
442 | * | |
443 | * Return 0 on success or else a negative value. | |
444 | */ | |
4628484a MD |
445 | static int create_ust_channel(struct lttng_consumer_channel *channel, |
446 | struct ustctl_consumer_channel_attr *attr, | |
447 | struct ustctl_consumer_channel **ust_chanp) | |
ffe60014 | 448 | { |
4628484a MD |
449 | int ret, nr_stream_fds, i, j; |
450 | int *stream_fds; | |
451 | struct ustctl_consumer_channel *ust_channel; | |
ffe60014 | 452 | |
4628484a | 453 | assert(channel); |
ffe60014 | 454 | assert(attr); |
4628484a | 455 | assert(ust_chanp); |
e5148e25 | 456 | assert(channel->buffer_credentials.is_set); |
ffe60014 DG |
457 | |
458 | DBG3("Creating channel to ustctl with attr: [overwrite: %d, " | |
459 | "subbuf_size: %" PRIu64 ", num_subbuf: %" PRIu64 ", " | |
460 | "switch_timer_interval: %u, read_timer_interval: %u, " | |
461 | "output: %d, type: %d", attr->overwrite, attr->subbuf_size, | |
462 | attr->num_subbuf, attr->switch_timer_interval, | |
463 | attr->read_timer_interval, attr->output, attr->type); | |
464 | ||
4628484a MD |
465 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) |
466 | nr_stream_fds = 1; | |
467 | else | |
468 | nr_stream_fds = ustctl_get_nr_stream_per_channel(); | |
469 | stream_fds = zmalloc(nr_stream_fds * sizeof(*stream_fds)); | |
470 | if (!stream_fds) { | |
471 | ret = -1; | |
472 | goto error_alloc; | |
473 | } | |
474 | for (i = 0; i < nr_stream_fds; i++) { | |
e5148e25 JG |
475 | stream_fds[i] = open_ust_stream_fd(channel, i, |
476 | &channel->buffer_credentials.value); | |
4628484a MD |
477 | if (stream_fds[i] < 0) { |
478 | ret = -1; | |
479 | goto error_open; | |
480 | } | |
481 | } | |
482 | ust_channel = ustctl_create_channel(attr, stream_fds, nr_stream_fds); | |
483 | if (!ust_channel) { | |
ffe60014 DG |
484 | ret = -1; |
485 | goto error_create; | |
486 | } | |
4628484a MD |
487 | channel->nr_stream_fds = nr_stream_fds; |
488 | channel->stream_fds = stream_fds; | |
489 | *ust_chanp = ust_channel; | |
ffe60014 DG |
490 | |
491 | return 0; | |
492 | ||
493 | error_create: | |
4628484a MD |
494 | error_open: |
495 | for (j = i - 1; j >= 0; j--) { | |
496 | int closeret; | |
497 | ||
498 | closeret = close(stream_fds[j]); | |
499 | if (closeret) { | |
500 | PERROR("close"); | |
501 | } | |
502 | if (channel->shm_path[0]) { | |
503 | char shm_path[PATH_MAX]; | |
504 | ||
505 | closeret = get_stream_shm_path(shm_path, | |
506 | channel->shm_path, j); | |
507 | if (closeret) { | |
508 | ERR("Cannot get stream shm path"); | |
509 | } | |
510 | closeret = run_as_unlink(shm_path, | |
e5148e25 JG |
511 | channel->buffer_credentials.value.uid, |
512 | channel->buffer_credentials.value.gid); | |
4628484a | 513 | if (closeret) { |
4628484a MD |
514 | PERROR("unlink %s", shm_path); |
515 | } | |
516 | } | |
517 | } | |
518 | /* Try to rmdir all directories under shm_path root. */ | |
519 | if (channel->root_shm_path[0]) { | |
602766ec | 520 | (void) run_as_rmdir_recursive(channel->root_shm_path, |
e5148e25 | 521 | channel->buffer_credentials.value.uid, |
58ec7253 MD |
522 | channel->buffer_credentials.value.gid, |
523 | LTTNG_DIRECTORY_HANDLE_SKIP_NON_EMPTY_FLAG); | |
4628484a MD |
524 | } |
525 | free(stream_fds); | |
526 | error_alloc: | |
ffe60014 DG |
527 | return ret; |
528 | } | |
529 | ||
d88aee68 DG |
530 | /* |
531 | * Send a single given stream to the session daemon using the sock. | |
532 | * | |
533 | * Return 0 on success else a negative value. | |
534 | */ | |
ffe60014 DG |
535 | static int send_sessiond_stream(int sock, struct lttng_consumer_stream *stream) |
536 | { | |
537 | int ret; | |
538 | ||
539 | assert(stream); | |
540 | assert(sock >= 0); | |
541 | ||
3eb914c0 | 542 | DBG("UST consumer sending stream %" PRIu64 " to sessiond", stream->key); |
ffe60014 DG |
543 | |
544 | /* Send stream to session daemon. */ | |
545 | ret = ustctl_send_stream_to_sessiond(sock, stream->ustream); | |
546 | if (ret < 0) { | |
547 | goto error; | |
548 | } | |
549 | ||
ffe60014 DG |
550 | error: |
551 | return ret; | |
552 | } | |
553 | ||
554 | /* | |
a3a86f35 | 555 | * Send channel to sessiond and relayd if applicable. |
ffe60014 | 556 | * |
d88aee68 | 557 | * Return 0 on success or else a negative value. |
ffe60014 | 558 | */ |
a3a86f35 | 559 | static int send_channel_to_sessiond_and_relayd(int sock, |
ffe60014 DG |
560 | struct lttng_consumer_channel *channel, |
561 | struct lttng_consumer_local_data *ctx, int *relayd_error) | |
562 | { | |
0c759fc9 | 563 | int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
ffe60014 | 564 | struct lttng_consumer_stream *stream; |
a4baae1b | 565 | uint64_t net_seq_idx = -1ULL; |
ffe60014 DG |
566 | |
567 | assert(channel); | |
568 | assert(ctx); | |
569 | assert(sock >= 0); | |
570 | ||
571 | DBG("UST consumer sending channel %s to sessiond", channel->name); | |
572 | ||
62285ea4 DG |
573 | if (channel->relayd_id != (uint64_t) -1ULL) { |
574 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
575 | |
576 | health_code_update(); | |
577 | ||
62285ea4 | 578 | /* Try to send the stream to the relayd if one is available. */ |
a3a86f35 JG |
579 | DBG("Sending stream %" PRIu64 " of channel \"%s\" to relayd", |
580 | stream->key, channel->name); | |
62285ea4 DG |
581 | ret = consumer_send_relayd_stream(stream, stream->chan->pathname); |
582 | if (ret < 0) { | |
583 | /* | |
584 | * Flag that the relayd was the problem here probably due to a | |
585 | * communicaton error on the socket. | |
586 | */ | |
587 | if (relayd_error) { | |
588 | *relayd_error = 1; | |
589 | } | |
725d28b2 | 590 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
ffe60014 | 591 | } |
a4baae1b JD |
592 | if (net_seq_idx == -1ULL) { |
593 | net_seq_idx = stream->net_seq_idx; | |
594 | } | |
595 | } | |
f2a444f1 | 596 | } |
ffe60014 | 597 | |
f2a444f1 DG |
598 | /* Inform sessiond that we are about to send channel and streams. */ |
599 | ret = consumer_send_status_msg(sock, ret_code); | |
0c759fc9 | 600 | if (ret < 0 || ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
f2a444f1 DG |
601 | /* |
602 | * Either the session daemon is not responding or the relayd died so we | |
603 | * stop now. | |
604 | */ | |
605 | goto error; | |
606 | } | |
607 | ||
608 | /* Send channel to sessiond. */ | |
609 | ret = ustctl_send_channel_to_sessiond(sock, channel->uchan); | |
610 | if (ret < 0) { | |
611 | goto error; | |
612 | } | |
613 | ||
614 | ret = ustctl_channel_close_wakeup_fd(channel->uchan); | |
615 | if (ret < 0) { | |
616 | goto error; | |
617 | } | |
618 | ||
619 | /* The channel was sent successfully to the sessiond at this point. */ | |
620 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
621 | |
622 | health_code_update(); | |
623 | ||
ffe60014 DG |
624 | /* Send stream to session daemon. */ |
625 | ret = send_sessiond_stream(sock, stream); | |
626 | if (ret < 0) { | |
627 | goto error; | |
628 | } | |
629 | } | |
630 | ||
631 | /* Tell sessiond there is no more stream. */ | |
632 | ret = ustctl_send_stream_to_sessiond(sock, NULL); | |
633 | if (ret < 0) { | |
634 | goto error; | |
635 | } | |
636 | ||
637 | DBG("UST consumer NULL stream sent to sessiond"); | |
638 | ||
639 | return 0; | |
640 | ||
641 | error: | |
0c759fc9 | 642 | if (ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
f2a444f1 DG |
643 | ret = -1; |
644 | } | |
ffe60014 DG |
645 | return ret; |
646 | } | |
647 | ||
648 | /* | |
649 | * Creates a channel and streams and add the channel it to the channel internal | |
650 | * state. The created stream must ONLY be sent once the GET_CHANNEL command is | |
651 | * received. | |
652 | * | |
653 | * Return 0 on success or else, a negative value is returned and the channel | |
654 | * MUST be destroyed by consumer_del_channel(). | |
655 | */ | |
75cfe9e6 | 656 | static int ask_channel(struct lttng_consumer_local_data *ctx, |
ffe60014 | 657 | struct lttng_consumer_channel *channel, |
e5148e25 | 658 | struct ustctl_consumer_channel_attr *attr) |
3bd1e081 MD |
659 | { |
660 | int ret; | |
661 | ||
ffe60014 DG |
662 | assert(ctx); |
663 | assert(channel); | |
664 | assert(attr); | |
665 | ||
666 | /* | |
667 | * This value is still used by the kernel consumer since for the kernel, | |
668 | * the stream ownership is not IN the consumer so we need to have the | |
669 | * number of left stream that needs to be initialized so we can know when | |
670 | * to delete the channel (see consumer.c). | |
671 | * | |
672 | * As for the user space tracer now, the consumer creates and sends the | |
673 | * stream to the session daemon which only sends them to the application | |
674 | * once every stream of a channel is received making this value useless | |
675 | * because we they will be added to the poll thread before the application | |
676 | * receives them. This ensures that a stream can not hang up during | |
677 | * initilization of a channel. | |
678 | */ | |
679 | channel->nb_init_stream_left = 0; | |
680 | ||
681 | /* The reply msg status is handled in the following call. */ | |
4628484a | 682 | ret = create_ust_channel(channel, attr, &channel->uchan); |
ffe60014 | 683 | if (ret < 0) { |
10a50311 | 684 | goto end; |
3bd1e081 MD |
685 | } |
686 | ||
d8ef542d MD |
687 | channel->wait_fd = ustctl_channel_get_wait_fd(channel->uchan); |
688 | ||
10a50311 JD |
689 | /* |
690 | * For the snapshots (no monitor), we create the metadata streams | |
691 | * on demand, not during the channel creation. | |
692 | */ | |
693 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && !channel->monitor) { | |
694 | ret = 0; | |
695 | goto end; | |
696 | } | |
697 | ||
ffe60014 | 698 | /* Open all streams for this channel. */ |
e5148e25 JG |
699 | pthread_mutex_lock(&channel->lock); |
700 | ret = create_ust_streams(channel, ctx); | |
701 | pthread_mutex_unlock(&channel->lock); | |
ffe60014 | 702 | if (ret < 0) { |
10a50311 | 703 | goto end; |
ffe60014 DG |
704 | } |
705 | ||
10a50311 | 706 | end: |
3bd1e081 MD |
707 | return ret; |
708 | } | |
709 | ||
d88aee68 DG |
710 | /* |
711 | * Send all stream of a channel to the right thread handling it. | |
712 | * | |
713 | * On error, return a negative value else 0 on success. | |
714 | */ | |
715 | static int send_streams_to_thread(struct lttng_consumer_channel *channel, | |
716 | struct lttng_consumer_local_data *ctx) | |
717 | { | |
718 | int ret = 0; | |
719 | struct lttng_consumer_stream *stream, *stmp; | |
720 | ||
721 | assert(channel); | |
722 | assert(ctx); | |
723 | ||
724 | /* Send streams to the corresponding thread. */ | |
725 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
726 | send_node) { | |
9ce5646a MD |
727 | |
728 | health_code_update(); | |
729 | ||
d88aee68 DG |
730 | /* Sending the stream to the thread. */ |
731 | ret = send_stream_to_thread(stream, ctx); | |
732 | if (ret < 0) { | |
733 | /* | |
734 | * If we are unable to send the stream to the thread, there is | |
735 | * a big problem so just stop everything. | |
736 | */ | |
737 | goto error; | |
738 | } | |
d88aee68 DG |
739 | } |
740 | ||
741 | error: | |
742 | return ret; | |
743 | } | |
744 | ||
7972aab2 DG |
745 | /* |
746 | * Flush channel's streams using the given key to retrieve the channel. | |
747 | * | |
748 | * Return 0 on success else an LTTng error code. | |
749 | */ | |
750 | static int flush_channel(uint64_t chan_key) | |
751 | { | |
752 | int ret = 0; | |
753 | struct lttng_consumer_channel *channel; | |
754 | struct lttng_consumer_stream *stream; | |
755 | struct lttng_ht *ht; | |
756 | struct lttng_ht_iter iter; | |
757 | ||
8fd623e0 | 758 | DBG("UST consumer flush channel key %" PRIu64, chan_key); |
7972aab2 | 759 | |
a500c257 | 760 | rcu_read_lock(); |
7972aab2 DG |
761 | channel = consumer_find_channel(chan_key); |
762 | if (!channel) { | |
8fd623e0 | 763 | ERR("UST consumer flush channel %" PRIu64 " not found", chan_key); |
7972aab2 DG |
764 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
765 | goto error; | |
766 | } | |
767 | ||
768 | ht = consumer_data.stream_per_chan_id_ht; | |
769 | ||
770 | /* For each stream of the channel id, flush it. */ | |
7972aab2 DG |
771 | cds_lfht_for_each_entry_duplicate(ht->ht, |
772 | ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct, | |
773 | &channel->key, &iter.iter, stream, node_channel_id.node) { | |
9ce5646a MD |
774 | |
775 | health_code_update(); | |
776 | ||
0dd01979 MD |
777 | pthread_mutex_lock(&stream->lock); |
778 | if (!stream->quiescent) { | |
779 | ustctl_flush_buffer(stream->ustream, 0); | |
780 | stream->quiescent = true; | |
781 | } | |
782 | pthread_mutex_unlock(&stream->lock); | |
783 | } | |
784 | error: | |
785 | rcu_read_unlock(); | |
786 | return ret; | |
787 | } | |
788 | ||
789 | /* | |
790 | * Clear quiescent state from channel's streams using the given key to | |
791 | * retrieve the channel. | |
792 | * | |
793 | * Return 0 on success else an LTTng error code. | |
794 | */ | |
795 | static int clear_quiescent_channel(uint64_t chan_key) | |
796 | { | |
797 | int ret = 0; | |
798 | struct lttng_consumer_channel *channel; | |
799 | struct lttng_consumer_stream *stream; | |
800 | struct lttng_ht *ht; | |
801 | struct lttng_ht_iter iter; | |
802 | ||
803 | DBG("UST consumer clear quiescent channel key %" PRIu64, chan_key); | |
804 | ||
805 | rcu_read_lock(); | |
806 | channel = consumer_find_channel(chan_key); | |
807 | if (!channel) { | |
808 | ERR("UST consumer clear quiescent channel %" PRIu64 " not found", chan_key); | |
809 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
810 | goto error; | |
811 | } | |
812 | ||
813 | ht = consumer_data.stream_per_chan_id_ht; | |
814 | ||
815 | /* For each stream of the channel id, clear quiescent state. */ | |
816 | cds_lfht_for_each_entry_duplicate(ht->ht, | |
817 | ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct, | |
818 | &channel->key, &iter.iter, stream, node_channel_id.node) { | |
819 | ||
820 | health_code_update(); | |
821 | ||
822 | pthread_mutex_lock(&stream->lock); | |
823 | stream->quiescent = false; | |
824 | pthread_mutex_unlock(&stream->lock); | |
7972aab2 | 825 | } |
7972aab2 | 826 | error: |
a500c257 | 827 | rcu_read_unlock(); |
7972aab2 DG |
828 | return ret; |
829 | } | |
830 | ||
d88aee68 DG |
831 | /* |
832 | * Close metadata stream wakeup_fd using the given key to retrieve the channel. | |
833 | * | |
834 | * Return 0 on success else an LTTng error code. | |
835 | */ | |
836 | static int close_metadata(uint64_t chan_key) | |
837 | { | |
ea88ca2a | 838 | int ret = 0; |
d88aee68 | 839 | struct lttng_consumer_channel *channel; |
f65a74be | 840 | unsigned int channel_monitor; |
d88aee68 | 841 | |
8fd623e0 | 842 | DBG("UST consumer close metadata key %" PRIu64, chan_key); |
d88aee68 DG |
843 | |
844 | channel = consumer_find_channel(chan_key); | |
845 | if (!channel) { | |
84cc9aa0 DG |
846 | /* |
847 | * This is possible if the metadata thread has issue a delete because | |
848 | * the endpoint point of the stream hung up. There is no way the | |
849 | * session daemon can know about it thus use a DBG instead of an actual | |
850 | * error. | |
851 | */ | |
852 | DBG("UST consumer close metadata %" PRIu64 " not found", chan_key); | |
d88aee68 DG |
853 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
854 | goto error; | |
855 | } | |
856 | ||
ea88ca2a | 857 | pthread_mutex_lock(&consumer_data.lock); |
a9838785 | 858 | pthread_mutex_lock(&channel->lock); |
f65a74be | 859 | channel_monitor = channel->monitor; |
73811ecc DG |
860 | if (cds_lfht_is_node_deleted(&channel->node.node)) { |
861 | goto error_unlock; | |
862 | } | |
863 | ||
6d574024 | 864 | lttng_ustconsumer_close_metadata(channel); |
f65a74be JG |
865 | pthread_mutex_unlock(&channel->lock); |
866 | pthread_mutex_unlock(&consumer_data.lock); | |
d88aee68 | 867 | |
f65a74be JG |
868 | /* |
869 | * The ownership of a metadata channel depends on the type of | |
870 | * session to which it belongs. In effect, the monitor flag is checked | |
871 | * to determine if this metadata channel is in "snapshot" mode or not. | |
872 | * | |
873 | * In the non-snapshot case, the metadata channel is created along with | |
874 | * a single stream which will remain present until the metadata channel | |
875 | * is destroyed (on the destruction of its session). In this case, the | |
876 | * metadata stream in "monitored" by the metadata poll thread and holds | |
877 | * the ownership of its channel. | |
878 | * | |
879 | * Closing the metadata will cause the metadata stream's "metadata poll | |
880 | * pipe" to be closed. Closing this pipe will wake-up the metadata poll | |
881 | * thread which will teardown the metadata stream which, in return, | |
882 | * deletes the metadata channel. | |
883 | * | |
884 | * In the snapshot case, the metadata stream is created and destroyed | |
885 | * on every snapshot record. Since the channel doesn't have an owner | |
886 | * other than the session daemon, it is safe to destroy it immediately | |
887 | * on reception of the CLOSE_METADATA command. | |
888 | */ | |
889 | if (!channel_monitor) { | |
890 | /* | |
891 | * The channel and consumer_data locks must be | |
892 | * released before this call since consumer_del_channel | |
893 | * re-acquires the channel and consumer_data locks to teardown | |
894 | * the channel and queue its reclamation by the "call_rcu" | |
895 | * worker thread. | |
896 | */ | |
897 | consumer_del_channel(channel); | |
898 | } | |
899 | ||
900 | return ret; | |
ea88ca2a | 901 | error_unlock: |
a9838785 | 902 | pthread_mutex_unlock(&channel->lock); |
ea88ca2a | 903 | pthread_mutex_unlock(&consumer_data.lock); |
d88aee68 DG |
904 | error: |
905 | return ret; | |
906 | } | |
907 | ||
908 | /* | |
909 | * RCU read side lock MUST be acquired before calling this function. | |
910 | * | |
911 | * Return 0 on success else an LTTng error code. | |
912 | */ | |
913 | static int setup_metadata(struct lttng_consumer_local_data *ctx, uint64_t key) | |
914 | { | |
915 | int ret; | |
916 | struct lttng_consumer_channel *metadata; | |
917 | ||
8fd623e0 | 918 | DBG("UST consumer setup metadata key %" PRIu64, key); |
d88aee68 DG |
919 | |
920 | metadata = consumer_find_channel(key); | |
921 | if (!metadata) { | |
922 | ERR("UST consumer push metadata %" PRIu64 " not found", key); | |
923 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
10a50311 JD |
924 | goto end; |
925 | } | |
926 | ||
927 | /* | |
928 | * In no monitor mode, the metadata channel has no stream(s) so skip the | |
929 | * ownership transfer to the metadata thread. | |
930 | */ | |
931 | if (!metadata->monitor) { | |
932 | DBG("Metadata channel in no monitor"); | |
933 | ret = 0; | |
934 | goto end; | |
d88aee68 DG |
935 | } |
936 | ||
937 | /* | |
938 | * Send metadata stream to relayd if one available. Availability is | |
939 | * known if the stream is still in the list of the channel. | |
940 | */ | |
941 | if (cds_list_empty(&metadata->streams.head)) { | |
942 | ERR("Metadata channel key %" PRIu64 ", no stream available.", key); | |
943 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
f5a0c9cf | 944 | goto error_no_stream; |
d88aee68 DG |
945 | } |
946 | ||
947 | /* Send metadata stream to relayd if needed. */ | |
62285ea4 DG |
948 | if (metadata->metadata_stream->net_seq_idx != (uint64_t) -1ULL) { |
949 | ret = consumer_send_relayd_stream(metadata->metadata_stream, | |
950 | metadata->pathname); | |
951 | if (ret < 0) { | |
952 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
953 | goto error; | |
954 | } | |
601262d6 JD |
955 | ret = consumer_send_relayd_streams_sent( |
956 | metadata->metadata_stream->net_seq_idx); | |
957 | if (ret < 0) { | |
958 | ret = LTTCOMM_CONSUMERD_RELAYD_FAIL; | |
959 | goto error; | |
960 | } | |
d88aee68 DG |
961 | } |
962 | ||
a8086cf4 JR |
963 | /* |
964 | * Ownership of metadata stream is passed along. Freeing is handled by | |
965 | * the callee. | |
966 | */ | |
d88aee68 DG |
967 | ret = send_streams_to_thread(metadata, ctx); |
968 | if (ret < 0) { | |
969 | /* | |
970 | * If we are unable to send the stream to the thread, there is | |
971 | * a big problem so just stop everything. | |
972 | */ | |
973 | ret = LTTCOMM_CONSUMERD_FATAL; | |
a8086cf4 | 974 | goto send_streams_error; |
d88aee68 DG |
975 | } |
976 | /* List MUST be empty after or else it could be reused. */ | |
977 | assert(cds_list_empty(&metadata->streams.head)); | |
978 | ||
10a50311 JD |
979 | ret = 0; |
980 | goto end; | |
d88aee68 DG |
981 | |
982 | error: | |
f2a444f1 DG |
983 | /* |
984 | * Delete metadata channel on error. At this point, the metadata stream can | |
985 | * NOT be monitored by the metadata thread thus having the guarantee that | |
986 | * the stream is still in the local stream list of the channel. This call | |
987 | * will make sure to clean that list. | |
988 | */ | |
f5a0c9cf | 989 | consumer_stream_destroy(metadata->metadata_stream, NULL); |
212d67a2 DG |
990 | cds_list_del(&metadata->metadata_stream->send_node); |
991 | metadata->metadata_stream = NULL; | |
a8086cf4 | 992 | send_streams_error: |
f5a0c9cf | 993 | error_no_stream: |
10a50311 JD |
994 | end: |
995 | return ret; | |
996 | } | |
997 | ||
998 | /* | |
999 | * Snapshot the whole metadata. | |
e5148e25 | 1000 | * RCU read-side lock must be held by the caller. |
10a50311 JD |
1001 | * |
1002 | * Returns 0 on success, < 0 on error | |
1003 | */ | |
b0226bd4 MD |
1004 | static int snapshot_metadata(struct lttng_consumer_channel *metadata_channel, |
1005 | uint64_t key, char *path, uint64_t relayd_id, | |
e5148e25 | 1006 | struct lttng_consumer_local_data *ctx) |
10a50311 JD |
1007 | { |
1008 | int ret = 0; | |
10a50311 JD |
1009 | struct lttng_consumer_stream *metadata_stream; |
1010 | ||
1011 | assert(path); | |
1012 | assert(ctx); | |
1013 | ||
1014 | DBG("UST consumer snapshot metadata with key %" PRIu64 " at path %s", | |
1015 | key, path); | |
1016 | ||
1017 | rcu_read_lock(); | |
1018 | ||
10a50311 JD |
1019 | assert(!metadata_channel->monitor); |
1020 | ||
9ce5646a MD |
1021 | health_code_update(); |
1022 | ||
10a50311 JD |
1023 | /* |
1024 | * Ask the sessiond if we have new metadata waiting and update the | |
1025 | * consumer metadata cache. | |
1026 | */ | |
94d49140 | 1027 | ret = lttng_ustconsumer_request_metadata(ctx, metadata_channel, 0, 1); |
10a50311 JD |
1028 | if (ret < 0) { |
1029 | goto error; | |
1030 | } | |
1031 | ||
9ce5646a MD |
1032 | health_code_update(); |
1033 | ||
10a50311 JD |
1034 | /* |
1035 | * The metadata stream is NOT created in no monitor mode when the channel | |
1036 | * is created on a sessiond ask channel command. | |
1037 | */ | |
e5148e25 | 1038 | ret = create_ust_streams(metadata_channel, ctx); |
10a50311 JD |
1039 | if (ret < 0) { |
1040 | goto error; | |
1041 | } | |
1042 | ||
1043 | metadata_stream = metadata_channel->metadata_stream; | |
1044 | assert(metadata_stream); | |
1045 | ||
e5148e25 | 1046 | pthread_mutex_lock(&metadata_stream->lock); |
10a50311 JD |
1047 | if (relayd_id != (uint64_t) -1ULL) { |
1048 | metadata_stream->net_seq_idx = relayd_id; | |
1049 | ret = consumer_send_relayd_stream(metadata_stream, path); | |
10a50311 | 1050 | } else { |
e5148e25 JG |
1051 | ret = consumer_stream_create_output_files(metadata_stream, |
1052 | false); | |
1053 | } | |
1054 | pthread_mutex_unlock(&metadata_stream->lock); | |
1055 | if (ret < 0) { | |
1056 | goto error_stream; | |
10a50311 JD |
1057 | } |
1058 | ||
04ef1097 | 1059 | do { |
9ce5646a MD |
1060 | health_code_update(); |
1061 | ||
10a50311 JD |
1062 | ret = lttng_consumer_read_subbuffer(metadata_stream, ctx); |
1063 | if (ret < 0) { | |
94d49140 | 1064 | goto error_stream; |
10a50311 | 1065 | } |
04ef1097 | 1066 | } while (ret > 0); |
10a50311 | 1067 | |
10a50311 JD |
1068 | error_stream: |
1069 | /* | |
1070 | * Clean up the stream completly because the next snapshot will use a new | |
1071 | * metadata stream. | |
1072 | */ | |
e5148e25 | 1073 | pthread_mutex_lock(&metadata_stream->lock); |
10a50311 | 1074 | consumer_stream_destroy(metadata_stream, NULL); |
212d67a2 | 1075 | cds_list_del(&metadata_stream->send_node); |
10a50311 JD |
1076 | metadata_channel->metadata_stream = NULL; |
1077 | ||
1078 | error: | |
1079 | rcu_read_unlock(); | |
1080 | return ret; | |
1081 | } | |
1082 | ||
1083 | /* | |
1084 | * Take a snapshot of all the stream of a channel. | |
e5148e25 | 1085 | * RCU read-side lock and the channel lock must be held by the caller. |
10a50311 JD |
1086 | * |
1087 | * Returns 0 on success, < 0 on error | |
1088 | */ | |
b0226bd4 MD |
1089 | static int snapshot_channel(struct lttng_consumer_channel *channel, |
1090 | uint64_t key, char *path, uint64_t relayd_id, | |
e098433c JG |
1091 | uint64_t nb_packets_per_stream, |
1092 | struct lttng_consumer_local_data *ctx) | |
10a50311 JD |
1093 | { |
1094 | int ret; | |
1095 | unsigned use_relayd = 0; | |
1096 | unsigned long consumed_pos, produced_pos; | |
10a50311 JD |
1097 | struct lttng_consumer_stream *stream; |
1098 | ||
1099 | assert(path); | |
1100 | assert(ctx); | |
1101 | ||
1102 | rcu_read_lock(); | |
1103 | ||
1104 | if (relayd_id != (uint64_t) -1ULL) { | |
1105 | use_relayd = 1; | |
1106 | } | |
1107 | ||
10a50311 | 1108 | assert(!channel->monitor); |
6a00837f | 1109 | DBG("UST consumer snapshot channel %" PRIu64, key); |
10a50311 JD |
1110 | |
1111 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
1112 | health_code_update(); |
1113 | ||
10a50311 JD |
1114 | /* Lock stream because we are about to change its state. */ |
1115 | pthread_mutex_lock(&stream->lock); | |
e5148e25 JG |
1116 | assert(channel->trace_chunk); |
1117 | if (!lttng_trace_chunk_get(channel->trace_chunk)) { | |
1118 | /* | |
1119 | * Can't happen barring an internal error as the channel | |
1120 | * holds a reference to the trace chunk. | |
1121 | */ | |
1122 | ERR("Failed to acquire reference to channel's trace chunk"); | |
1123 | ret = -1; | |
1124 | goto error_unlock; | |
1125 | } | |
1126 | assert(!stream->trace_chunk); | |
1127 | stream->trace_chunk = channel->trace_chunk; | |
1128 | ||
10a50311 JD |
1129 | stream->net_seq_idx = relayd_id; |
1130 | ||
1131 | if (use_relayd) { | |
1132 | ret = consumer_send_relayd_stream(stream, path); | |
1133 | if (ret < 0) { | |
1134 | goto error_unlock; | |
1135 | } | |
1136 | } else { | |
e5148e25 JG |
1137 | ret = consumer_stream_create_output_files(stream, |
1138 | false); | |
10a50311 JD |
1139 | if (ret < 0) { |
1140 | goto error_unlock; | |
1141 | } | |
e5148e25 JG |
1142 | DBG("UST consumer snapshot stream (%" PRIu64 ")", |
1143 | stream->key); | |
10a50311 JD |
1144 | } |
1145 | ||
d4d80f77 MD |
1146 | /* |
1147 | * If tracing is active, we want to perform a "full" buffer flush. | |
1148 | * Else, if quiescent, it has already been done by the prior stop. | |
1149 | */ | |
1150 | if (!stream->quiescent) { | |
1151 | ustctl_flush_buffer(stream->ustream, 0); | |
1152 | } | |
10a50311 JD |
1153 | |
1154 | ret = lttng_ustconsumer_take_snapshot(stream); | |
1155 | if (ret < 0) { | |
1156 | ERR("Taking UST snapshot"); | |
1157 | goto error_unlock; | |
1158 | } | |
1159 | ||
1160 | ret = lttng_ustconsumer_get_produced_snapshot(stream, &produced_pos); | |
1161 | if (ret < 0) { | |
1162 | ERR("Produced UST snapshot position"); | |
1163 | goto error_unlock; | |
1164 | } | |
1165 | ||
1166 | ret = lttng_ustconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
1167 | if (ret < 0) { | |
1168 | ERR("Consumerd UST snapshot position"); | |
1169 | goto error_unlock; | |
1170 | } | |
1171 | ||
5c786ded JD |
1172 | /* |
1173 | * The original value is sent back if max stream size is larger than | |
d07ceecd | 1174 | * the possible size of the snapshot. Also, we assume that the session |
5c786ded JD |
1175 | * daemon should never send a maximum stream size that is lower than |
1176 | * subbuffer size. | |
1177 | */ | |
d07ceecd MD |
1178 | consumed_pos = consumer_get_consume_start_pos(consumed_pos, |
1179 | produced_pos, nb_packets_per_stream, | |
1180 | stream->max_sb_size); | |
5c786ded | 1181 | |
0fdaf1ed | 1182 | while ((long) (consumed_pos - produced_pos) < 0) { |
10a50311 JD |
1183 | ssize_t read_len; |
1184 | unsigned long len, padded_len; | |
1185 | ||
9ce5646a MD |
1186 | health_code_update(); |
1187 | ||
10a50311 JD |
1188 | DBG("UST consumer taking snapshot at pos %lu", consumed_pos); |
1189 | ||
1190 | ret = ustctl_get_subbuf(stream->ustream, &consumed_pos); | |
1191 | if (ret < 0) { | |
1192 | if (ret != -EAGAIN) { | |
1193 | PERROR("ustctl_get_subbuf snapshot"); | |
1194 | goto error_close_stream; | |
1195 | } | |
1196 | DBG("UST consumer get subbuf failed. Skipping it."); | |
1197 | consumed_pos += stream->max_sb_size; | |
ddc93ee4 | 1198 | stream->chan->lost_packets++; |
10a50311 JD |
1199 | continue; |
1200 | } | |
1201 | ||
1202 | ret = ustctl_get_subbuf_size(stream->ustream, &len); | |
1203 | if (ret < 0) { | |
1204 | ERR("Snapshot ustctl_get_subbuf_size"); | |
1205 | goto error_put_subbuf; | |
1206 | } | |
1207 | ||
1208 | ret = ustctl_get_padded_subbuf_size(stream->ustream, &padded_len); | |
1209 | if (ret < 0) { | |
1210 | ERR("Snapshot ustctl_get_padded_subbuf_size"); | |
1211 | goto error_put_subbuf; | |
1212 | } | |
1213 | ||
1214 | read_len = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, len, | |
309167d2 | 1215 | padded_len - len, NULL); |
10a50311 JD |
1216 | if (use_relayd) { |
1217 | if (read_len != len) { | |
56591bac | 1218 | ret = -EPERM; |
10a50311 JD |
1219 | goto error_put_subbuf; |
1220 | } | |
1221 | } else { | |
1222 | if (read_len != padded_len) { | |
56591bac | 1223 | ret = -EPERM; |
10a50311 JD |
1224 | goto error_put_subbuf; |
1225 | } | |
1226 | } | |
1227 | ||
1228 | ret = ustctl_put_subbuf(stream->ustream); | |
1229 | if (ret < 0) { | |
1230 | ERR("Snapshot ustctl_put_subbuf"); | |
1231 | goto error_close_stream; | |
1232 | } | |
1233 | consumed_pos += stream->max_sb_size; | |
1234 | } | |
1235 | ||
1236 | /* Simply close the stream so we can use it on the next snapshot. */ | |
1237 | consumer_stream_close(stream); | |
1238 | pthread_mutex_unlock(&stream->lock); | |
1239 | } | |
1240 | ||
1241 | rcu_read_unlock(); | |
1242 | return 0; | |
1243 | ||
1244 | error_put_subbuf: | |
1245 | if (ustctl_put_subbuf(stream->ustream) < 0) { | |
1246 | ERR("Snapshot ustctl_put_subbuf"); | |
1247 | } | |
1248 | error_close_stream: | |
1249 | consumer_stream_close(stream); | |
1250 | error_unlock: | |
1251 | pthread_mutex_unlock(&stream->lock); | |
10a50311 | 1252 | rcu_read_unlock(); |
d88aee68 DG |
1253 | return ret; |
1254 | } | |
1255 | ||
331744e3 | 1256 | /* |
c585821b MD |
1257 | * Receive the metadata updates from the sessiond. Supports receiving |
1258 | * overlapping metadata, but is needs to always belong to a contiguous | |
1259 | * range starting from 0. | |
1260 | * Be careful about the locks held when calling this function: it needs | |
1261 | * the metadata cache flush to concurrently progress in order to | |
1262 | * complete. | |
331744e3 JD |
1263 | */ |
1264 | int lttng_ustconsumer_recv_metadata(int sock, uint64_t key, uint64_t offset, | |
93ec662e JD |
1265 | uint64_t len, uint64_t version, |
1266 | struct lttng_consumer_channel *channel, int timer, int wait) | |
331744e3 | 1267 | { |
0c759fc9 | 1268 | int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
331744e3 JD |
1269 | char *metadata_str; |
1270 | ||
8fd623e0 | 1271 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, len); |
331744e3 JD |
1272 | |
1273 | metadata_str = zmalloc(len * sizeof(char)); | |
1274 | if (!metadata_str) { | |
1275 | PERROR("zmalloc metadata string"); | |
1276 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; | |
1277 | goto end; | |
1278 | } | |
1279 | ||
9ce5646a MD |
1280 | health_code_update(); |
1281 | ||
331744e3 JD |
1282 | /* Receive metadata string. */ |
1283 | ret = lttcomm_recv_unix_sock(sock, metadata_str, len); | |
1284 | if (ret < 0) { | |
1285 | /* Session daemon is dead so return gracefully. */ | |
1286 | ret_code = ret; | |
1287 | goto end_free; | |
1288 | } | |
1289 | ||
9ce5646a MD |
1290 | health_code_update(); |
1291 | ||
331744e3 | 1292 | pthread_mutex_lock(&channel->metadata_cache->lock); |
93ec662e JD |
1293 | ret = consumer_metadata_cache_write(channel, offset, len, version, |
1294 | metadata_str); | |
331744e3 JD |
1295 | if (ret < 0) { |
1296 | /* Unable to handle metadata. Notify session daemon. */ | |
1297 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
a32bd775 DG |
1298 | /* |
1299 | * Skip metadata flush on write error since the offset and len might | |
1300 | * not have been updated which could create an infinite loop below when | |
1301 | * waiting for the metadata cache to be flushed. | |
1302 | */ | |
1303 | pthread_mutex_unlock(&channel->metadata_cache->lock); | |
a32bd775 | 1304 | goto end_free; |
331744e3 JD |
1305 | } |
1306 | pthread_mutex_unlock(&channel->metadata_cache->lock); | |
1307 | ||
94d49140 JD |
1308 | if (!wait) { |
1309 | goto end_free; | |
1310 | } | |
5e41ebe1 | 1311 | while (consumer_metadata_cache_flushed(channel, offset + len, timer)) { |
331744e3 | 1312 | DBG("Waiting for metadata to be flushed"); |
9ce5646a MD |
1313 | |
1314 | health_code_update(); | |
1315 | ||
331744e3 JD |
1316 | usleep(DEFAULT_METADATA_AVAILABILITY_WAIT_TIME); |
1317 | } | |
1318 | ||
1319 | end_free: | |
1320 | free(metadata_str); | |
1321 | end: | |
1322 | return ret_code; | |
1323 | } | |
1324 | ||
4cbc1a04 DG |
1325 | /* |
1326 | * Receive command from session daemon and process it. | |
1327 | * | |
1328 | * Return 1 on success else a negative value or 0. | |
1329 | */ | |
3bd1e081 MD |
1330 | int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
1331 | int sock, struct pollfd *consumer_sockpoll) | |
1332 | { | |
1333 | ssize_t ret; | |
0c759fc9 | 1334 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
3bd1e081 | 1335 | struct lttcomm_consumer_msg msg; |
ffe60014 | 1336 | struct lttng_consumer_channel *channel = NULL; |
3bd1e081 | 1337 | |
9ce5646a MD |
1338 | health_code_update(); |
1339 | ||
3bd1e081 MD |
1340 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); |
1341 | if (ret != sizeof(msg)) { | |
173af62f DG |
1342 | DBG("Consumer received unexpected message size %zd (expects %zu)", |
1343 | ret, sizeof(msg)); | |
3be74084 DG |
1344 | /* |
1345 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
1346 | * since the caller handles this. | |
1347 | */ | |
489f70e9 | 1348 | if (ret > 0) { |
c6857fcf | 1349 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
489f70e9 MD |
1350 | ret = -1; |
1351 | } | |
3bd1e081 MD |
1352 | return ret; |
1353 | } | |
9ce5646a MD |
1354 | |
1355 | health_code_update(); | |
1356 | ||
84382d49 MD |
1357 | /* deprecated */ |
1358 | assert(msg.cmd_type != LTTNG_CONSUMER_STOP); | |
3bd1e081 | 1359 | |
9ce5646a MD |
1360 | health_code_update(); |
1361 | ||
3f8e211f | 1362 | /* relayd needs RCU read-side lock */ |
b0b335c8 MD |
1363 | rcu_read_lock(); |
1364 | ||
3bd1e081 | 1365 | switch (msg.cmd_type) { |
00e2e675 DG |
1366 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
1367 | { | |
f50f23d9 | 1368 | /* Session daemon status message are handled in the following call. */ |
2527bf85 | 1369 | consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
7735ef9e | 1370 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, |
d3e2ba59 JD |
1371 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id, |
1372 | msg.u.relayd_sock.relayd_session_id); | |
00e2e675 DG |
1373 | goto end_nosignal; |
1374 | } | |
173af62f DG |
1375 | case LTTNG_CONSUMER_DESTROY_RELAYD: |
1376 | { | |
a6ba4fe1 | 1377 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
173af62f DG |
1378 | struct consumer_relayd_sock_pair *relayd; |
1379 | ||
a6ba4fe1 | 1380 | DBG("UST consumer destroying relayd %" PRIu64, index); |
173af62f DG |
1381 | |
1382 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 1383 | relayd = consumer_find_relayd(index); |
173af62f | 1384 | if (relayd == NULL) { |
3448e266 | 1385 | DBG("Unable to find relayd %" PRIu64, index); |
e462382a | 1386 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
173af62f DG |
1387 | } |
1388 | ||
a6ba4fe1 DG |
1389 | /* |
1390 | * Each relayd socket pair has a refcount of stream attached to it | |
1391 | * which tells if the relayd is still active or not depending on the | |
1392 | * refcount value. | |
1393 | * | |
1394 | * This will set the destroy flag of the relayd object and destroy it | |
1395 | * if the refcount reaches zero when called. | |
1396 | * | |
1397 | * The destroy can happen either here or when a stream fd hangs up. | |
1398 | */ | |
f50f23d9 DG |
1399 | if (relayd) { |
1400 | consumer_flag_relayd_for_destroy(relayd); | |
1401 | } | |
1402 | ||
d88aee68 | 1403 | goto end_msg_sessiond; |
173af62f | 1404 | } |
3bd1e081 MD |
1405 | case LTTNG_CONSUMER_UPDATE_STREAM: |
1406 | { | |
3f8e211f | 1407 | rcu_read_unlock(); |
7ad0a0cb | 1408 | return -ENOSYS; |
3bd1e081 | 1409 | } |
6d805429 | 1410 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 1411 | { |
3be74084 | 1412 | int ret, is_data_pending; |
6d805429 | 1413 | uint64_t id = msg.u.data_pending.session_id; |
ca22feea | 1414 | |
6d805429 | 1415 | DBG("UST consumer data pending command for id %" PRIu64, id); |
ca22feea | 1416 | |
3be74084 | 1417 | is_data_pending = consumer_data_pending(id); |
ca22feea DG |
1418 | |
1419 | /* Send back returned value to session daemon */ | |
3be74084 DG |
1420 | ret = lttcomm_send_unix_sock(sock, &is_data_pending, |
1421 | sizeof(is_data_pending)); | |
ca22feea | 1422 | if (ret < 0) { |
3be74084 | 1423 | DBG("Error when sending the data pending ret code: %d", ret); |
489f70e9 | 1424 | goto error_fatal; |
ca22feea | 1425 | } |
f50f23d9 DG |
1426 | |
1427 | /* | |
1428 | * No need to send back a status message since the data pending | |
1429 | * returned value is the response. | |
1430 | */ | |
ca22feea | 1431 | break; |
53632229 | 1432 | } |
ffe60014 DG |
1433 | case LTTNG_CONSUMER_ASK_CHANNEL_CREATION: |
1434 | { | |
1435 | int ret; | |
1436 | struct ustctl_consumer_channel_attr attr; | |
e5148e25 JG |
1437 | const uint64_t chunk_id = msg.u.ask_channel.chunk_id.value; |
1438 | const struct lttng_credentials buffer_credentials = { | |
1439 | .uid = msg.u.ask_channel.buffer_credentials.uid, | |
1440 | .gid = msg.u.ask_channel.buffer_credentials.gid, | |
1441 | }; | |
ffe60014 DG |
1442 | |
1443 | /* Create a plain object and reserve a channel key. */ | |
1444 | channel = allocate_channel(msg.u.ask_channel.session_id, | |
e5148e25 JG |
1445 | msg.u.ask_channel.chunk_id.is_set ? |
1446 | &chunk_id : NULL, | |
1447 | msg.u.ask_channel.pathname, | |
1448 | msg.u.ask_channel.name, | |
1449 | msg.u.ask_channel.relayd_id, | |
1450 | msg.u.ask_channel.key, | |
1624d5b7 JD |
1451 | (enum lttng_event_output) msg.u.ask_channel.output, |
1452 | msg.u.ask_channel.tracefile_size, | |
2bba9e53 | 1453 | msg.u.ask_channel.tracefile_count, |
1950109e | 1454 | msg.u.ask_channel.session_id_per_pid, |
ecc48a90 | 1455 | msg.u.ask_channel.monitor, |
d7ba1388 | 1456 | msg.u.ask_channel.live_timer_interval, |
3d071855 | 1457 | msg.u.ask_channel.root_shm_path, |
d7ba1388 | 1458 | msg.u.ask_channel.shm_path); |
ffe60014 DG |
1459 | if (!channel) { |
1460 | goto end_channel_error; | |
1461 | } | |
1462 | ||
e5148e25 JG |
1463 | LTTNG_OPTIONAL_SET(&channel->buffer_credentials, |
1464 | buffer_credentials); | |
1465 | ||
567eb353 DG |
1466 | /* |
1467 | * Assign UST application UID to the channel. This value is ignored for | |
1468 | * per PID buffers. This is specific to UST thus setting this after the | |
1469 | * allocation. | |
1470 | */ | |
1471 | channel->ust_app_uid = msg.u.ask_channel.ust_app_uid; | |
1472 | ||
ffe60014 DG |
1473 | /* Build channel attributes from received message. */ |
1474 | attr.subbuf_size = msg.u.ask_channel.subbuf_size; | |
1475 | attr.num_subbuf = msg.u.ask_channel.num_subbuf; | |
1476 | attr.overwrite = msg.u.ask_channel.overwrite; | |
1477 | attr.switch_timer_interval = msg.u.ask_channel.switch_timer_interval; | |
1478 | attr.read_timer_interval = msg.u.ask_channel.read_timer_interval; | |
7972aab2 | 1479 | attr.chan_id = msg.u.ask_channel.chan_id; |
ffe60014 | 1480 | memcpy(attr.uuid, msg.u.ask_channel.uuid, sizeof(attr.uuid)); |
491d1539 | 1481 | attr.blocking_timeout= msg.u.ask_channel.blocking_timeout; |
ffe60014 | 1482 | |
0c759fc9 DG |
1483 | /* Match channel buffer type to the UST abi. */ |
1484 | switch (msg.u.ask_channel.output) { | |
1485 | case LTTNG_EVENT_MMAP: | |
1486 | default: | |
1487 | attr.output = LTTNG_UST_MMAP; | |
1488 | break; | |
1489 | } | |
1490 | ||
ffe60014 DG |
1491 | /* Translate and save channel type. */ |
1492 | switch (msg.u.ask_channel.type) { | |
1493 | case LTTNG_UST_CHAN_PER_CPU: | |
1494 | channel->type = CONSUMER_CHANNEL_TYPE_DATA; | |
1495 | attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8633d6e3 MD |
1496 | /* |
1497 | * Set refcount to 1 for owner. Below, we will | |
1498 | * pass ownership to the | |
1499 | * consumer_thread_channel_poll() thread. | |
1500 | */ | |
1501 | channel->refcount = 1; | |
ffe60014 DG |
1502 | break; |
1503 | case LTTNG_UST_CHAN_METADATA: | |
1504 | channel->type = CONSUMER_CHANNEL_TYPE_METADATA; | |
1505 | attr.type = LTTNG_UST_CHAN_METADATA; | |
1506 | break; | |
1507 | default: | |
1508 | assert(0); | |
1509 | goto error_fatal; | |
1510 | }; | |
1511 | ||
9ce5646a MD |
1512 | health_code_update(); |
1513 | ||
e5148e25 | 1514 | ret = ask_channel(ctx, channel, &attr); |
ffe60014 DG |
1515 | if (ret < 0) { |
1516 | goto end_channel_error; | |
1517 | } | |
1518 | ||
fc643247 MD |
1519 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
1520 | ret = consumer_metadata_cache_allocate(channel); | |
1521 | if (ret < 0) { | |
1522 | ERR("Allocating metadata cache"); | |
1523 | goto end_channel_error; | |
1524 | } | |
1525 | consumer_timer_switch_start(channel, attr.switch_timer_interval); | |
1526 | attr.switch_timer_interval = 0; | |
94d49140 | 1527 | } else { |
e9404c27 JG |
1528 | int monitor_start_ret; |
1529 | ||
94d49140 JD |
1530 | consumer_timer_live_start(channel, |
1531 | msg.u.ask_channel.live_timer_interval); | |
e9404c27 JG |
1532 | monitor_start_ret = consumer_timer_monitor_start( |
1533 | channel, | |
1534 | msg.u.ask_channel.monitor_timer_interval); | |
1535 | if (monitor_start_ret < 0) { | |
1536 | ERR("Starting channel monitoring timer failed"); | |
1537 | goto end_channel_error; | |
1538 | } | |
fc643247 MD |
1539 | } |
1540 | ||
9ce5646a MD |
1541 | health_code_update(); |
1542 | ||
ffe60014 DG |
1543 | /* |
1544 | * Add the channel to the internal state AFTER all streams were created | |
1545 | * and successfully sent to session daemon. This way, all streams must | |
1546 | * be ready before this channel is visible to the threads. | |
fc643247 MD |
1547 | * If add_channel succeeds, ownership of the channel is |
1548 | * passed to consumer_thread_channel_poll(). | |
ffe60014 DG |
1549 | */ |
1550 | ret = add_channel(channel, ctx); | |
1551 | if (ret < 0) { | |
ea88ca2a MD |
1552 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
1553 | if (channel->switch_timer_enabled == 1) { | |
1554 | consumer_timer_switch_stop(channel); | |
1555 | } | |
1556 | consumer_metadata_cache_destroy(channel); | |
1557 | } | |
d3e2ba59 JD |
1558 | if (channel->live_timer_enabled == 1) { |
1559 | consumer_timer_live_stop(channel); | |
1560 | } | |
e9404c27 JG |
1561 | if (channel->monitor_timer_enabled == 1) { |
1562 | consumer_timer_monitor_stop(channel); | |
1563 | } | |
ffe60014 DG |
1564 | goto end_channel_error; |
1565 | } | |
1566 | ||
9ce5646a MD |
1567 | health_code_update(); |
1568 | ||
ffe60014 DG |
1569 | /* |
1570 | * Channel and streams are now created. Inform the session daemon that | |
1571 | * everything went well and should wait to receive the channel and | |
1572 | * streams with ustctl API. | |
1573 | */ | |
1574 | ret = consumer_send_status_channel(sock, channel); | |
1575 | if (ret < 0) { | |
1576 | /* | |
489f70e9 | 1577 | * There is probably a problem on the socket. |
ffe60014 | 1578 | */ |
489f70e9 | 1579 | goto error_fatal; |
ffe60014 DG |
1580 | } |
1581 | ||
1582 | break; | |
1583 | } | |
1584 | case LTTNG_CONSUMER_GET_CHANNEL: | |
1585 | { | |
1586 | int ret, relayd_err = 0; | |
d88aee68 | 1587 | uint64_t key = msg.u.get_channel.key; |
ffe60014 | 1588 | struct lttng_consumer_channel *channel; |
ffe60014 DG |
1589 | |
1590 | channel = consumer_find_channel(key); | |
1591 | if (!channel) { | |
8fd623e0 | 1592 | ERR("UST consumer get channel key %" PRIu64 " not found", key); |
e462382a | 1593 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
57377f7d | 1594 | goto end_get_channel; |
ffe60014 DG |
1595 | } |
1596 | ||
9ce5646a MD |
1597 | health_code_update(); |
1598 | ||
a3a86f35 JG |
1599 | /* Send the channel to sessiond (and relayd, if applicable). */ |
1600 | ret = send_channel_to_sessiond_and_relayd(sock, channel, ctx, | |
1601 | &relayd_err); | |
ffe60014 DG |
1602 | if (ret < 0) { |
1603 | if (relayd_err) { | |
1604 | /* | |
1605 | * We were unable to send to the relayd the stream so avoid | |
1606 | * sending back a fatal error to the thread since this is OK | |
f2a444f1 DG |
1607 | * and the consumer can continue its work. The above call |
1608 | * has sent the error status message to the sessiond. | |
ffe60014 | 1609 | */ |
57377f7d | 1610 | goto end_get_channel_nosignal; |
ffe60014 DG |
1611 | } |
1612 | /* | |
1613 | * The communicaton was broken hence there is a bad state between | |
1614 | * the consumer and sessiond so stop everything. | |
1615 | */ | |
57377f7d | 1616 | goto error_get_channel_fatal; |
ffe60014 DG |
1617 | } |
1618 | ||
9ce5646a MD |
1619 | health_code_update(); |
1620 | ||
10a50311 JD |
1621 | /* |
1622 | * In no monitor mode, the streams ownership is kept inside the channel | |
1623 | * so don't send them to the data thread. | |
1624 | */ | |
1625 | if (!channel->monitor) { | |
57377f7d | 1626 | goto end_get_channel; |
10a50311 JD |
1627 | } |
1628 | ||
d88aee68 DG |
1629 | ret = send_streams_to_thread(channel, ctx); |
1630 | if (ret < 0) { | |
1631 | /* | |
1632 | * If we are unable to send the stream to the thread, there is | |
1633 | * a big problem so just stop everything. | |
1634 | */ | |
57377f7d | 1635 | goto error_get_channel_fatal; |
ffe60014 | 1636 | } |
ffe60014 DG |
1637 | /* List MUST be empty after or else it could be reused. */ |
1638 | assert(cds_list_empty(&channel->streams.head)); | |
57377f7d | 1639 | end_get_channel: |
d88aee68 | 1640 | goto end_msg_sessiond; |
57377f7d JG |
1641 | error_get_channel_fatal: |
1642 | goto error_fatal; | |
1643 | end_get_channel_nosignal: | |
1644 | goto end_nosignal; | |
d88aee68 DG |
1645 | } |
1646 | case LTTNG_CONSUMER_DESTROY_CHANNEL: | |
1647 | { | |
1648 | uint64_t key = msg.u.destroy_channel.key; | |
d88aee68 | 1649 | |
a0cbdd2e MD |
1650 | /* |
1651 | * Only called if streams have not been sent to stream | |
1652 | * manager thread. However, channel has been sent to | |
1653 | * channel manager thread. | |
1654 | */ | |
1655 | notify_thread_del_channel(ctx, key); | |
d88aee68 | 1656 | goto end_msg_sessiond; |
ffe60014 | 1657 | } |
d88aee68 DG |
1658 | case LTTNG_CONSUMER_CLOSE_METADATA: |
1659 | { | |
1660 | int ret; | |
1661 | ||
1662 | ret = close_metadata(msg.u.close_metadata.key); | |
1663 | if (ret != 0) { | |
1664 | ret_code = ret; | |
1665 | } | |
1666 | ||
1667 | goto end_msg_sessiond; | |
1668 | } | |
7972aab2 DG |
1669 | case LTTNG_CONSUMER_FLUSH_CHANNEL: |
1670 | { | |
1671 | int ret; | |
1672 | ||
1673 | ret = flush_channel(msg.u.flush_channel.key); | |
1674 | if (ret != 0) { | |
1675 | ret_code = ret; | |
1676 | } | |
1677 | ||
1678 | goto end_msg_sessiond; | |
1679 | } | |
0dd01979 MD |
1680 | case LTTNG_CONSUMER_CLEAR_QUIESCENT_CHANNEL: |
1681 | { | |
1682 | int ret; | |
1683 | ||
1684 | ret = clear_quiescent_channel( | |
1685 | msg.u.clear_quiescent_channel.key); | |
1686 | if (ret != 0) { | |
1687 | ret_code = ret; | |
1688 | } | |
1689 | ||
1690 | goto end_msg_sessiond; | |
1691 | } | |
d88aee68 | 1692 | case LTTNG_CONSUMER_PUSH_METADATA: |
ffe60014 DG |
1693 | { |
1694 | int ret; | |
d88aee68 | 1695 | uint64_t len = msg.u.push_metadata.len; |
d88aee68 | 1696 | uint64_t key = msg.u.push_metadata.key; |
331744e3 | 1697 | uint64_t offset = msg.u.push_metadata.target_offset; |
93ec662e | 1698 | uint64_t version = msg.u.push_metadata.version; |
ffe60014 DG |
1699 | struct lttng_consumer_channel *channel; |
1700 | ||
8fd623e0 DG |
1701 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, |
1702 | len); | |
ffe60014 DG |
1703 | |
1704 | channel = consumer_find_channel(key); | |
1705 | if (!channel) { | |
000baf6a DG |
1706 | /* |
1707 | * This is possible if the metadata creation on the consumer side | |
1708 | * is in flight vis-a-vis a concurrent push metadata from the | |
1709 | * session daemon. Simply return that the channel failed and the | |
1710 | * session daemon will handle that message correctly considering | |
1711 | * that this race is acceptable thus the DBG() statement here. | |
1712 | */ | |
1713 | DBG("UST consumer push metadata %" PRIu64 " not found", key); | |
1714 | ret_code = LTTCOMM_CONSUMERD_CHANNEL_FAIL; | |
8bb060b3 | 1715 | goto end_push_metadata_msg_sessiond; |
d88aee68 DG |
1716 | } |
1717 | ||
9ce5646a MD |
1718 | health_code_update(); |
1719 | ||
c585821b MD |
1720 | if (!len) { |
1721 | /* | |
1722 | * There is nothing to receive. We have simply | |
1723 | * checked whether the channel can be found. | |
1724 | */ | |
1725 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
8bb060b3 | 1726 | goto end_push_metadata_msg_sessiond; |
c585821b MD |
1727 | } |
1728 | ||
d88aee68 | 1729 | /* Tell session daemon we are ready to receive the metadata. */ |
0c759fc9 | 1730 | ret = consumer_send_status_msg(sock, LTTCOMM_CONSUMERD_SUCCESS); |
ffe60014 DG |
1731 | if (ret < 0) { |
1732 | /* Somehow, the session daemon is not responding anymore. */ | |
8bb060b3 | 1733 | goto error_push_metadata_fatal; |
d88aee68 DG |
1734 | } |
1735 | ||
9ce5646a MD |
1736 | health_code_update(); |
1737 | ||
d88aee68 | 1738 | /* Wait for more data. */ |
9ce5646a MD |
1739 | health_poll_entry(); |
1740 | ret = lttng_consumer_poll_socket(consumer_sockpoll); | |
1741 | health_poll_exit(); | |
84382d49 | 1742 | if (ret) { |
8bb060b3 | 1743 | goto error_push_metadata_fatal; |
d88aee68 DG |
1744 | } |
1745 | ||
9ce5646a MD |
1746 | health_code_update(); |
1747 | ||
331744e3 | 1748 | ret = lttng_ustconsumer_recv_metadata(sock, key, offset, |
93ec662e | 1749 | len, version, channel, 0, 1); |
d88aee68 | 1750 | if (ret < 0) { |
331744e3 | 1751 | /* error receiving from sessiond */ |
8bb060b3 | 1752 | goto error_push_metadata_fatal; |
331744e3 JD |
1753 | } else { |
1754 | ret_code = ret; | |
8bb060b3 | 1755 | goto end_push_metadata_msg_sessiond; |
d88aee68 | 1756 | } |
8bb060b3 JG |
1757 | end_push_metadata_msg_sessiond: |
1758 | goto end_msg_sessiond; | |
1759 | error_push_metadata_fatal: | |
1760 | goto error_fatal; | |
d88aee68 DG |
1761 | } |
1762 | case LTTNG_CONSUMER_SETUP_METADATA: | |
1763 | { | |
1764 | int ret; | |
1765 | ||
1766 | ret = setup_metadata(ctx, msg.u.setup_metadata.key); | |
1767 | if (ret) { | |
1768 | ret_code = ret; | |
1769 | } | |
1770 | goto end_msg_sessiond; | |
ffe60014 | 1771 | } |
6dc3064a DG |
1772 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
1773 | { | |
b0226bd4 MD |
1774 | struct lttng_consumer_channel *channel; |
1775 | uint64_t key = msg.u.snapshot_channel.key; | |
1776 | ||
1777 | channel = consumer_find_channel(key); | |
1778 | if (!channel) { | |
1779 | DBG("UST snapshot channel not found for key %" PRIu64, key); | |
1780 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
10a50311 | 1781 | } else { |
b0226bd4 MD |
1782 | if (msg.u.snapshot_channel.metadata) { |
1783 | ret = snapshot_metadata(channel, key, | |
1784 | msg.u.snapshot_channel.pathname, | |
1785 | msg.u.snapshot_channel.relayd_id, | |
e5148e25 | 1786 | ctx); |
b0226bd4 MD |
1787 | if (ret < 0) { |
1788 | ERR("Snapshot metadata failed"); | |
1789 | ret_code = LTTCOMM_CONSUMERD_SNAPSHOT_FAILED; | |
1790 | } | |
1791 | } else { | |
1792 | ret = snapshot_channel(channel, key, | |
1793 | msg.u.snapshot_channel.pathname, | |
1794 | msg.u.snapshot_channel.relayd_id, | |
1795 | msg.u.snapshot_channel.nb_packets_per_stream, | |
1796 | ctx); | |
1797 | if (ret < 0) { | |
1798 | ERR("Snapshot channel failed"); | |
1799 | ret_code = LTTCOMM_CONSUMERD_SNAPSHOT_FAILED; | |
1800 | } | |
10a50311 JD |
1801 | } |
1802 | } | |
9ce5646a | 1803 | health_code_update(); |
6dc3064a DG |
1804 | ret = consumer_send_status_msg(sock, ret_code); |
1805 | if (ret < 0) { | |
1806 | /* Somehow, the session daemon is not responding anymore. */ | |
1807 | goto end_nosignal; | |
1808 | } | |
9ce5646a | 1809 | health_code_update(); |
6dc3064a DG |
1810 | break; |
1811 | } | |
fb83fe64 JD |
1812 | case LTTNG_CONSUMER_DISCARDED_EVENTS: |
1813 | { | |
beb59458 MJ |
1814 | int ret = 0; |
1815 | uint64_t discarded_events; | |
fb83fe64 JD |
1816 | struct lttng_ht_iter iter; |
1817 | struct lttng_ht *ht; | |
1818 | struct lttng_consumer_stream *stream; | |
1819 | uint64_t id = msg.u.discarded_events.session_id; | |
1820 | uint64_t key = msg.u.discarded_events.channel_key; | |
1821 | ||
1822 | DBG("UST consumer discarded events command for session id %" | |
1823 | PRIu64, id); | |
1824 | rcu_read_lock(); | |
1825 | pthread_mutex_lock(&consumer_data.lock); | |
1826 | ||
1827 | ht = consumer_data.stream_list_ht; | |
1828 | ||
1829 | /* | |
1830 | * We only need a reference to the channel, but they are not | |
1831 | * directly indexed, so we just use the first matching stream | |
1832 | * to extract the information we need, we default to 0 if not | |
1833 | * found (no events are dropped if the channel is not yet in | |
1834 | * use). | |
1835 | */ | |
beb59458 | 1836 | discarded_events = 0; |
fb83fe64 JD |
1837 | cds_lfht_for_each_entry_duplicate(ht->ht, |
1838 | ht->hash_fct(&id, lttng_ht_seed), | |
1839 | ht->match_fct, &id, | |
1840 | &iter.iter, stream, node_session_id.node) { | |
1841 | if (stream->chan->key == key) { | |
beb59458 | 1842 | discarded_events = stream->chan->discarded_events; |
fb83fe64 JD |
1843 | break; |
1844 | } | |
1845 | } | |
1846 | pthread_mutex_unlock(&consumer_data.lock); | |
1847 | rcu_read_unlock(); | |
1848 | ||
1849 | DBG("UST consumer discarded events command for session id %" | |
1850 | PRIu64 ", channel key %" PRIu64, id, key); | |
1851 | ||
1852 | health_code_update(); | |
1853 | ||
1854 | /* Send back returned value to session daemon */ | |
beb59458 | 1855 | ret = lttcomm_send_unix_sock(sock, &discarded_events, sizeof(discarded_events)); |
fb83fe64 JD |
1856 | if (ret < 0) { |
1857 | PERROR("send discarded events"); | |
1858 | goto error_fatal; | |
1859 | } | |
1860 | ||
1861 | break; | |
1862 | } | |
1863 | case LTTNG_CONSUMER_LOST_PACKETS: | |
1864 | { | |
9a06e8d4 JG |
1865 | int ret; |
1866 | uint64_t lost_packets; | |
fb83fe64 JD |
1867 | struct lttng_ht_iter iter; |
1868 | struct lttng_ht *ht; | |
1869 | struct lttng_consumer_stream *stream; | |
1870 | uint64_t id = msg.u.lost_packets.session_id; | |
1871 | uint64_t key = msg.u.lost_packets.channel_key; | |
1872 | ||
1873 | DBG("UST consumer lost packets command for session id %" | |
1874 | PRIu64, id); | |
1875 | rcu_read_lock(); | |
1876 | pthread_mutex_lock(&consumer_data.lock); | |
1877 | ||
1878 | ht = consumer_data.stream_list_ht; | |
1879 | ||
1880 | /* | |
1881 | * We only need a reference to the channel, but they are not | |
1882 | * directly indexed, so we just use the first matching stream | |
1883 | * to extract the information we need, we default to 0 if not | |
1884 | * found (no packets lost if the channel is not yet in use). | |
1885 | */ | |
9a06e8d4 | 1886 | lost_packets = 0; |
fb83fe64 JD |
1887 | cds_lfht_for_each_entry_duplicate(ht->ht, |
1888 | ht->hash_fct(&id, lttng_ht_seed), | |
1889 | ht->match_fct, &id, | |
1890 | &iter.iter, stream, node_session_id.node) { | |
1891 | if (stream->chan->key == key) { | |
9a06e8d4 | 1892 | lost_packets = stream->chan->lost_packets; |
fb83fe64 JD |
1893 | break; |
1894 | } | |
1895 | } | |
1896 | pthread_mutex_unlock(&consumer_data.lock); | |
1897 | rcu_read_unlock(); | |
1898 | ||
1899 | DBG("UST consumer lost packets command for session id %" | |
1900 | PRIu64 ", channel key %" PRIu64, id, key); | |
1901 | ||
1902 | health_code_update(); | |
1903 | ||
1904 | /* Send back returned value to session daemon */ | |
9a06e8d4 JG |
1905 | ret = lttcomm_send_unix_sock(sock, &lost_packets, |
1906 | sizeof(lost_packets)); | |
fb83fe64 JD |
1907 | if (ret < 0) { |
1908 | PERROR("send lost packets"); | |
1909 | goto error_fatal; | |
1910 | } | |
1911 | ||
1912 | break; | |
1913 | } | |
b3530820 JG |
1914 | case LTTNG_CONSUMER_SET_CHANNEL_MONITOR_PIPE: |
1915 | { | |
1916 | int channel_monitor_pipe; | |
1917 | ||
1918 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1919 | /* Successfully received the command's type. */ | |
1920 | ret = consumer_send_status_msg(sock, ret_code); | |
1921 | if (ret < 0) { | |
1922 | goto error_fatal; | |
1923 | } | |
1924 | ||
1925 | ret = lttcomm_recv_fds_unix_sock(sock, &channel_monitor_pipe, | |
1926 | 1); | |
1927 | if (ret != sizeof(channel_monitor_pipe)) { | |
1928 | ERR("Failed to receive channel monitor pipe"); | |
1929 | goto error_fatal; | |
1930 | } | |
1931 | ||
1932 | DBG("Received channel monitor pipe (%d)", channel_monitor_pipe); | |
1933 | ret = consumer_timer_thread_set_channel_monitor_pipe( | |
1934 | channel_monitor_pipe); | |
1935 | if (!ret) { | |
1936 | int flags; | |
1937 | ||
1938 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1939 | /* Set the pipe as non-blocking. */ | |
1940 | ret = fcntl(channel_monitor_pipe, F_GETFL, 0); | |
1941 | if (ret == -1) { | |
1942 | PERROR("fcntl get flags of the channel monitoring pipe"); | |
1943 | goto error_fatal; | |
1944 | } | |
1945 | flags = ret; | |
1946 | ||
1947 | ret = fcntl(channel_monitor_pipe, F_SETFL, | |
1948 | flags | O_NONBLOCK); | |
1949 | if (ret == -1) { | |
1950 | PERROR("fcntl set O_NONBLOCK flag of the channel monitoring pipe"); | |
1951 | goto error_fatal; | |
1952 | } | |
1953 | DBG("Channel monitor pipe set as non-blocking"); | |
1954 | } else { | |
1955 | ret_code = LTTCOMM_CONSUMERD_ALREADY_SET; | |
1956 | } | |
1957 | goto end_msg_sessiond; | |
1958 | } | |
b99a8d42 JD |
1959 | case LTTNG_CONSUMER_ROTATE_CHANNEL: |
1960 | { | |
e96d66b4 MD |
1961 | struct lttng_consumer_channel *channel; |
1962 | uint64_t key = msg.u.rotate_channel.key; | |
b99a8d42 | 1963 | |
e96d66b4 MD |
1964 | channel = consumer_find_channel(key); |
1965 | if (!channel) { | |
1966 | DBG("Channel %" PRIu64 " not found", key); | |
1967 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
1968 | } else { | |
1969 | /* | |
1970 | * Sample the rotate position of all the streams in | |
1971 | * this channel. | |
1972 | */ | |
1973 | ret = lttng_consumer_rotate_channel(channel, key, | |
e96d66b4 MD |
1974 | msg.u.rotate_channel.relayd_id, |
1975 | msg.u.rotate_channel.metadata, | |
e96d66b4 MD |
1976 | ctx); |
1977 | if (ret < 0) { | |
1978 | ERR("Rotate channel failed"); | |
1979 | ret_code = LTTCOMM_CONSUMERD_ROTATION_FAIL; | |
1980 | } | |
b99a8d42 | 1981 | |
e96d66b4 MD |
1982 | health_code_update(); |
1983 | } | |
b99a8d42 JD |
1984 | ret = consumer_send_status_msg(sock, ret_code); |
1985 | if (ret < 0) { | |
1986 | /* Somehow, the session daemon is not responding anymore. */ | |
c69b5db6 | 1987 | goto end_rotate_channel_nosignal; |
b99a8d42 JD |
1988 | } |
1989 | ||
1990 | /* | |
1991 | * Rotate the streams that are ready right now. | |
1992 | * FIXME: this is a second consecutive iteration over the | |
1993 | * streams in a channel, there is probably a better way to | |
1994 | * handle this, but it needs to be after the | |
1995 | * consumer_send_status_msg() call. | |
1996 | */ | |
e96d66b4 MD |
1997 | if (channel) { |
1998 | ret = lttng_consumer_rotate_ready_streams( | |
1999 | channel, key, ctx); | |
2000 | if (ret < 0) { | |
2001 | ERR("Rotate channel failed"); | |
2002 | } | |
b99a8d42 JD |
2003 | } |
2004 | break; | |
c69b5db6 JG |
2005 | end_rotate_channel_nosignal: |
2006 | goto end_nosignal; | |
b99a8d42 | 2007 | } |
e5148e25 | 2008 | case LTTNG_CONSUMER_INIT: |
00fb02ac | 2009 | { |
e5148e25 JG |
2010 | ret_code = lttng_consumer_init_command(ctx, |
2011 | msg.u.init.sessiond_uuid); | |
d88744a4 | 2012 | health_code_update(); |
d88744a4 JD |
2013 | ret = consumer_send_status_msg(sock, ret_code); |
2014 | if (ret < 0) { | |
2015 | /* Somehow, the session daemon is not responding anymore. */ | |
2016 | goto end_nosignal; | |
2017 | } | |
2018 | break; | |
2019 | } | |
e5148e25 | 2020 | case LTTNG_CONSUMER_CREATE_TRACE_CHUNK: |
d88744a4 | 2021 | { |
e5148e25 | 2022 | const struct lttng_credentials credentials = { |
0ebdafe0 JG |
2023 | .uid = msg.u.create_trace_chunk.credentials.value.uid, |
2024 | .gid = msg.u.create_trace_chunk.credentials.value.gid, | |
e5148e25 JG |
2025 | }; |
2026 | const bool is_local_trace = | |
2027 | !msg.u.create_trace_chunk.relayd_id.is_set; | |
2028 | const uint64_t relayd_id = | |
2029 | msg.u.create_trace_chunk.relayd_id.value; | |
2030 | const char *chunk_override_name = | |
2031 | *msg.u.create_trace_chunk.override_name ? | |
2032 | msg.u.create_trace_chunk.override_name : | |
2033 | NULL; | |
2034 | LTTNG_OPTIONAL(struct lttng_directory_handle) chunk_directory_handle = | |
2035 | LTTNG_OPTIONAL_INIT; | |
d88744a4 | 2036 | |
e5148e25 JG |
2037 | /* |
2038 | * The session daemon will only provide a chunk directory file | |
2039 | * descriptor for local traces. | |
2040 | */ | |
2041 | if (is_local_trace) { | |
2042 | int chunk_dirfd; | |
19990ed5 | 2043 | |
e5148e25 JG |
2044 | /* Acnowledge the reception of the command. */ |
2045 | ret = consumer_send_status_msg(sock, | |
2046 | LTTCOMM_CONSUMERD_SUCCESS); | |
2047 | if (ret < 0) { | |
2048 | /* Somehow, the session daemon is not responding anymore. */ | |
2049 | goto end_nosignal; | |
2050 | } | |
82528808 | 2051 | |
e5148e25 JG |
2052 | ret = lttcomm_recv_fds_unix_sock(sock, &chunk_dirfd, 1); |
2053 | if (ret != sizeof(chunk_dirfd)) { | |
2054 | ERR("Failed to receive trace chunk directory file descriptor"); | |
2055 | goto error_fatal; | |
2056 | } | |
82528808 | 2057 | |
e5148e25 JG |
2058 | DBG("Received trace chunk directory fd (%d)", |
2059 | chunk_dirfd); | |
2060 | ret = lttng_directory_handle_init_from_dirfd( | |
2061 | &chunk_directory_handle.value, | |
2062 | chunk_dirfd); | |
2063 | if (ret) { | |
2064 | ERR("Failed to initialize chunk directory handle from directory file descriptor"); | |
2065 | if (close(chunk_dirfd)) { | |
2066 | PERROR("Failed to close chunk directory file descriptor"); | |
2067 | } | |
2068 | goto error_fatal; | |
2069 | } | |
2070 | chunk_directory_handle.is_set = true; | |
82528808 JG |
2071 | } |
2072 | ||
e5148e25 JG |
2073 | ret_code = lttng_consumer_create_trace_chunk( |
2074 | !is_local_trace ? &relayd_id : NULL, | |
2075 | msg.u.create_trace_chunk.session_id, | |
2076 | msg.u.create_trace_chunk.chunk_id, | |
0ebdafe0 JG |
2077 | (time_t) msg.u.create_trace_chunk |
2078 | .creation_timestamp, | |
e5148e25 | 2079 | chunk_override_name, |
0ebdafe0 JG |
2080 | msg.u.create_trace_chunk.credentials.is_set ? |
2081 | &credentials : | |
2082 | NULL, | |
e5148e25 JG |
2083 | chunk_directory_handle.is_set ? |
2084 | &chunk_directory_handle.value : | |
2085 | NULL); | |
82528808 | 2086 | |
e5148e25 JG |
2087 | if (chunk_directory_handle.is_set) { |
2088 | lttng_directory_handle_fini( | |
2089 | &chunk_directory_handle.value); | |
d88744a4 | 2090 | } |
e5148e25 | 2091 | goto end_msg_sessiond; |
00fb02ac | 2092 | } |
e5148e25 | 2093 | case LTTNG_CONSUMER_CLOSE_TRACE_CHUNK: |
a1ae2ea5 | 2094 | { |
6bbcff33 JG |
2095 | enum lttng_trace_chunk_command_type close_command = |
2096 | msg.u.close_trace_chunk.close_command.value; | |
e5148e25 JG |
2097 | const uint64_t relayd_id = |
2098 | msg.u.close_trace_chunk.relayd_id.value; | |
41b23598 MD |
2099 | struct lttcomm_consumer_close_trace_chunk_reply reply; |
2100 | char closed_trace_chunk_path[LTTNG_PATH_MAX]; | |
2101 | int ret; | |
e5148e25 JG |
2102 | |
2103 | ret_code = lttng_consumer_close_trace_chunk( | |
2104 | msg.u.close_trace_chunk.relayd_id.is_set ? | |
6bbcff33 JG |
2105 | &relayd_id : |
2106 | NULL, | |
e5148e25 JG |
2107 | msg.u.close_trace_chunk.session_id, |
2108 | msg.u.close_trace_chunk.chunk_id, | |
6bbcff33 JG |
2109 | (time_t) msg.u.close_trace_chunk.close_timestamp, |
2110 | msg.u.close_trace_chunk.close_command.is_set ? | |
2111 | &close_command : | |
41b23598 MD |
2112 | NULL, closed_trace_chunk_path); |
2113 | reply.ret_code = ret_code; | |
2114 | reply.path_length = strlen(closed_trace_chunk_path) + 1; | |
2115 | ret = lttcomm_send_unix_sock(sock, &reply, sizeof(reply)); | |
2116 | if (ret != sizeof(reply)) { | |
2117 | goto error_fatal; | |
2118 | } | |
2119 | ret = lttcomm_send_unix_sock(sock, closed_trace_chunk_path, | |
2120 | reply.path_length); | |
2121 | if (ret != reply.path_length) { | |
2122 | goto error_fatal; | |
2123 | } | |
2124 | goto end_nosignal; | |
a1ae2ea5 | 2125 | } |
e5148e25 | 2126 | case LTTNG_CONSUMER_TRACE_CHUNK_EXISTS: |
fc181d72 | 2127 | { |
e5148e25 JG |
2128 | const uint64_t relayd_id = |
2129 | msg.u.trace_chunk_exists.relayd_id.value; | |
2130 | ||
2131 | ret_code = lttng_consumer_trace_chunk_exists( | |
2132 | msg.u.trace_chunk_exists.relayd_id.is_set ? | |
2133 | &relayd_id : NULL, | |
2134 | msg.u.trace_chunk_exists.session_id, | |
2135 | msg.u.trace_chunk_exists.chunk_id); | |
2136 | goto end_msg_sessiond; | |
fc181d72 | 2137 | } |
3bd1e081 MD |
2138 | default: |
2139 | break; | |
2140 | } | |
3f8e211f | 2141 | |
3bd1e081 | 2142 | end_nosignal: |
4cbc1a04 DG |
2143 | /* |
2144 | * Return 1 to indicate success since the 0 value can be a socket | |
2145 | * shutdown during the recv() or send() call. | |
2146 | */ | |
57377f7d JG |
2147 | ret = 1; |
2148 | goto end; | |
ffe60014 DG |
2149 | |
2150 | end_msg_sessiond: | |
2151 | /* | |
2152 | * The returned value here is not useful since either way we'll return 1 to | |
2153 | * the caller because the session daemon socket management is done | |
2154 | * elsewhere. Returning a negative code or 0 will shutdown the consumer. | |
2155 | */ | |
489f70e9 MD |
2156 | ret = consumer_send_status_msg(sock, ret_code); |
2157 | if (ret < 0) { | |
2158 | goto error_fatal; | |
2159 | } | |
57377f7d JG |
2160 | ret = 1; |
2161 | goto end; | |
9ce5646a | 2162 | |
ffe60014 DG |
2163 | end_channel_error: |
2164 | if (channel) { | |
e5148e25 | 2165 | pthread_mutex_unlock(&channel->lock); |
ffe60014 DG |
2166 | /* |
2167 | * Free channel here since no one has a reference to it. We don't | |
2168 | * free after that because a stream can store this pointer. | |
2169 | */ | |
2170 | destroy_channel(channel); | |
2171 | } | |
2172 | /* We have to send a status channel message indicating an error. */ | |
2173 | ret = consumer_send_status_channel(sock, NULL); | |
2174 | if (ret < 0) { | |
2175 | /* Stop everything if session daemon can not be notified. */ | |
2176 | goto error_fatal; | |
2177 | } | |
57377f7d JG |
2178 | ret = 1; |
2179 | goto end; | |
9ce5646a | 2180 | |
ffe60014 | 2181 | error_fatal: |
ffe60014 | 2182 | /* This will issue a consumer stop. */ |
57377f7d JG |
2183 | ret = -1; |
2184 | goto end; | |
2185 | ||
2186 | end: | |
2187 | rcu_read_unlock(); | |
2188 | health_code_update(); | |
2189 | return ret; | |
3bd1e081 MD |
2190 | } |
2191 | ||
ffe60014 DG |
2192 | /* |
2193 | * Wrapper over the mmap() read offset from ust-ctl library. Since this can be | |
2194 | * compiled out, we isolate it in this library. | |
2195 | */ | |
2196 | int lttng_ustctl_get_mmap_read_offset(struct lttng_consumer_stream *stream, | |
2197 | unsigned long *off) | |
3bd1e081 | 2198 | { |
ffe60014 DG |
2199 | assert(stream); |
2200 | assert(stream->ustream); | |
b5c5fc29 | 2201 | |
ffe60014 | 2202 | return ustctl_get_mmap_read_offset(stream->ustream, off); |
3bd1e081 MD |
2203 | } |
2204 | ||
ffe60014 DG |
2205 | /* |
2206 | * Wrapper over the mmap() read offset from ust-ctl library. Since this can be | |
2207 | * compiled out, we isolate it in this library. | |
2208 | */ | |
2209 | void *lttng_ustctl_get_mmap_base(struct lttng_consumer_stream *stream) | |
d056b477 | 2210 | { |
ffe60014 DG |
2211 | assert(stream); |
2212 | assert(stream->ustream); | |
2213 | ||
2214 | return ustctl_get_mmap_base(stream->ustream); | |
d056b477 MD |
2215 | } |
2216 | ||
fc6d7a51 JD |
2217 | void lttng_ustctl_flush_buffer(struct lttng_consumer_stream *stream, |
2218 | int producer_active) | |
2219 | { | |
2220 | assert(stream); | |
2221 | assert(stream->ustream); | |
2222 | ||
2223 | ustctl_flush_buffer(stream->ustream, producer_active); | |
2224 | } | |
2225 | ||
ffe60014 | 2226 | /* |
e9404c27 | 2227 | * Take a snapshot for a specific stream. |
ffe60014 DG |
2228 | * |
2229 | * Returns 0 on success, < 0 on error | |
2230 | */ | |
2231 | int lttng_ustconsumer_take_snapshot(struct lttng_consumer_stream *stream) | |
3bd1e081 | 2232 | { |
ffe60014 DG |
2233 | assert(stream); |
2234 | assert(stream->ustream); | |
2235 | ||
2236 | return ustctl_snapshot(stream->ustream); | |
3bd1e081 MD |
2237 | } |
2238 | ||
e9404c27 JG |
2239 | /* |
2240 | * Sample consumed and produced positions for a specific stream. | |
2241 | * | |
2242 | * Returns 0 on success, < 0 on error. | |
2243 | */ | |
2244 | int lttng_ustconsumer_sample_snapshot_positions( | |
2245 | struct lttng_consumer_stream *stream) | |
2246 | { | |
2247 | assert(stream); | |
2248 | assert(stream->ustream); | |
2249 | ||
2250 | return ustctl_snapshot_sample_positions(stream->ustream); | |
2251 | } | |
2252 | ||
ffe60014 DG |
2253 | /* |
2254 | * Get the produced position | |
2255 | * | |
2256 | * Returns 0 on success, < 0 on error | |
2257 | */ | |
2258 | int lttng_ustconsumer_get_produced_snapshot( | |
2259 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
3bd1e081 | 2260 | { |
ffe60014 DG |
2261 | assert(stream); |
2262 | assert(stream->ustream); | |
2263 | assert(pos); | |
7a57cf92 | 2264 | |
ffe60014 DG |
2265 | return ustctl_snapshot_get_produced(stream->ustream, pos); |
2266 | } | |
7a57cf92 | 2267 | |
10a50311 JD |
2268 | /* |
2269 | * Get the consumed position | |
2270 | * | |
2271 | * Returns 0 on success, < 0 on error | |
2272 | */ | |
2273 | int lttng_ustconsumer_get_consumed_snapshot( | |
2274 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
2275 | { | |
2276 | assert(stream); | |
2277 | assert(stream->ustream); | |
2278 | assert(pos); | |
2279 | ||
2280 | return ustctl_snapshot_get_consumed(stream->ustream, pos); | |
2281 | } | |
2282 | ||
84a182ce DG |
2283 | void lttng_ustconsumer_flush_buffer(struct lttng_consumer_stream *stream, |
2284 | int producer) | |
2285 | { | |
2286 | assert(stream); | |
2287 | assert(stream->ustream); | |
2288 | ||
2289 | ustctl_flush_buffer(stream->ustream, producer); | |
2290 | } | |
2291 | ||
2292 | int lttng_ustconsumer_get_current_timestamp( | |
2293 | struct lttng_consumer_stream *stream, uint64_t *ts) | |
2294 | { | |
2295 | assert(stream); | |
2296 | assert(stream->ustream); | |
2297 | assert(ts); | |
2298 | ||
2299 | return ustctl_get_current_timestamp(stream->ustream, ts); | |
2300 | } | |
2301 | ||
fb83fe64 JD |
2302 | int lttng_ustconsumer_get_sequence_number( |
2303 | struct lttng_consumer_stream *stream, uint64_t *seq) | |
2304 | { | |
2305 | assert(stream); | |
2306 | assert(stream->ustream); | |
2307 | assert(seq); | |
2308 | ||
2309 | return ustctl_get_sequence_number(stream->ustream, seq); | |
2310 | } | |
2311 | ||
ffe60014 | 2312 | /* |
0dd01979 | 2313 | * Called when the stream signals the consumer that it has hung up. |
ffe60014 DG |
2314 | */ |
2315 | void lttng_ustconsumer_on_stream_hangup(struct lttng_consumer_stream *stream) | |
2316 | { | |
2317 | assert(stream); | |
2318 | assert(stream->ustream); | |
2c1dd183 | 2319 | |
0dd01979 MD |
2320 | pthread_mutex_lock(&stream->lock); |
2321 | if (!stream->quiescent) { | |
2322 | ustctl_flush_buffer(stream->ustream, 0); | |
2323 | stream->quiescent = true; | |
2324 | } | |
2325 | pthread_mutex_unlock(&stream->lock); | |
ffe60014 DG |
2326 | stream->hangup_flush_done = 1; |
2327 | } | |
ee77a7b0 | 2328 | |
ffe60014 DG |
2329 | void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan) |
2330 | { | |
4628484a MD |
2331 | int i; |
2332 | ||
ffe60014 DG |
2333 | assert(chan); |
2334 | assert(chan->uchan); | |
e5148e25 | 2335 | assert(chan->buffer_credentials.is_set); |
e316aad5 | 2336 | |
ea88ca2a MD |
2337 | if (chan->switch_timer_enabled == 1) { |
2338 | consumer_timer_switch_stop(chan); | |
2339 | } | |
4628484a MD |
2340 | for (i = 0; i < chan->nr_stream_fds; i++) { |
2341 | int ret; | |
2342 | ||
2343 | ret = close(chan->stream_fds[i]); | |
2344 | if (ret) { | |
2345 | PERROR("close"); | |
2346 | } | |
2347 | if (chan->shm_path[0]) { | |
2348 | char shm_path[PATH_MAX]; | |
2349 | ||
2350 | ret = get_stream_shm_path(shm_path, chan->shm_path, i); | |
2351 | if (ret) { | |
2352 | ERR("Cannot get stream shm path"); | |
2353 | } | |
e5148e25 JG |
2354 | ret = run_as_unlink(shm_path, |
2355 | chan->buffer_credentials.value.uid, | |
2356 | chan->buffer_credentials.value.gid); | |
4628484a | 2357 | if (ret) { |
4628484a MD |
2358 | PERROR("unlink %s", shm_path); |
2359 | } | |
2360 | } | |
2361 | } | |
3bd1e081 MD |
2362 | } |
2363 | ||
b83e03c4 MD |
2364 | void lttng_ustconsumer_free_channel(struct lttng_consumer_channel *chan) |
2365 | { | |
2366 | assert(chan); | |
2367 | assert(chan->uchan); | |
e5148e25 | 2368 | assert(chan->buffer_credentials.is_set); |
b83e03c4 MD |
2369 | |
2370 | consumer_metadata_cache_destroy(chan); | |
2371 | ustctl_destroy_channel(chan->uchan); | |
ea853771 JR |
2372 | /* Try to rmdir all directories under shm_path root. */ |
2373 | if (chan->root_shm_path[0]) { | |
602766ec | 2374 | (void) run_as_rmdir_recursive(chan->root_shm_path, |
e5148e25 | 2375 | chan->buffer_credentials.value.uid, |
58ec7253 MD |
2376 | chan->buffer_credentials.value.gid, |
2377 | LTTNG_DIRECTORY_HANDLE_SKIP_NON_EMPTY_FLAG); | |
ea853771 | 2378 | } |
b83e03c4 MD |
2379 | free(chan->stream_fds); |
2380 | } | |
2381 | ||
3bd1e081 MD |
2382 | void lttng_ustconsumer_del_stream(struct lttng_consumer_stream *stream) |
2383 | { | |
ffe60014 DG |
2384 | assert(stream); |
2385 | assert(stream->ustream); | |
d41f73b7 | 2386 | |
ea88ca2a MD |
2387 | if (stream->chan->switch_timer_enabled == 1) { |
2388 | consumer_timer_switch_stop(stream->chan); | |
2389 | } | |
ffe60014 DG |
2390 | ustctl_destroy_stream(stream->ustream); |
2391 | } | |
d41f73b7 | 2392 | |
6d574024 DG |
2393 | int lttng_ustconsumer_get_wakeup_fd(struct lttng_consumer_stream *stream) |
2394 | { | |
2395 | assert(stream); | |
2396 | assert(stream->ustream); | |
2397 | ||
2398 | return ustctl_stream_get_wakeup_fd(stream->ustream); | |
2399 | } | |
2400 | ||
2401 | int lttng_ustconsumer_close_wakeup_fd(struct lttng_consumer_stream *stream) | |
2402 | { | |
2403 | assert(stream); | |
2404 | assert(stream->ustream); | |
2405 | ||
2406 | return ustctl_stream_close_wakeup_fd(stream->ustream); | |
2407 | } | |
2408 | ||
309167d2 JD |
2409 | /* |
2410 | * Populate index values of a UST stream. Values are set in big endian order. | |
2411 | * | |
2412 | * Return 0 on success or else a negative value. | |
2413 | */ | |
50adc264 | 2414 | static int get_index_values(struct ctf_packet_index *index, |
309167d2 JD |
2415 | struct ustctl_consumer_stream *ustream) |
2416 | { | |
2417 | int ret; | |
2418 | ||
2419 | ret = ustctl_get_timestamp_begin(ustream, &index->timestamp_begin); | |
2420 | if (ret < 0) { | |
2421 | PERROR("ustctl_get_timestamp_begin"); | |
2422 | goto error; | |
2423 | } | |
2424 | index->timestamp_begin = htobe64(index->timestamp_begin); | |
2425 | ||
2426 | ret = ustctl_get_timestamp_end(ustream, &index->timestamp_end); | |
2427 | if (ret < 0) { | |
2428 | PERROR("ustctl_get_timestamp_end"); | |
2429 | goto error; | |
2430 | } | |
2431 | index->timestamp_end = htobe64(index->timestamp_end); | |
2432 | ||
2433 | ret = ustctl_get_events_discarded(ustream, &index->events_discarded); | |
2434 | if (ret < 0) { | |
2435 | PERROR("ustctl_get_events_discarded"); | |
2436 | goto error; | |
2437 | } | |
2438 | index->events_discarded = htobe64(index->events_discarded); | |
2439 | ||
2440 | ret = ustctl_get_content_size(ustream, &index->content_size); | |
2441 | if (ret < 0) { | |
2442 | PERROR("ustctl_get_content_size"); | |
2443 | goto error; | |
2444 | } | |
2445 | index->content_size = htobe64(index->content_size); | |
2446 | ||
2447 | ret = ustctl_get_packet_size(ustream, &index->packet_size); | |
2448 | if (ret < 0) { | |
2449 | PERROR("ustctl_get_packet_size"); | |
2450 | goto error; | |
2451 | } | |
2452 | index->packet_size = htobe64(index->packet_size); | |
2453 | ||
2454 | ret = ustctl_get_stream_id(ustream, &index->stream_id); | |
2455 | if (ret < 0) { | |
2456 | PERROR("ustctl_get_stream_id"); | |
2457 | goto error; | |
2458 | } | |
2459 | index->stream_id = htobe64(index->stream_id); | |
2460 | ||
234cd636 JD |
2461 | ret = ustctl_get_instance_id(ustream, &index->stream_instance_id); |
2462 | if (ret < 0) { | |
2463 | PERROR("ustctl_get_instance_id"); | |
2464 | goto error; | |
2465 | } | |
2466 | index->stream_instance_id = htobe64(index->stream_instance_id); | |
2467 | ||
2468 | ret = ustctl_get_sequence_number(ustream, &index->packet_seq_num); | |
2469 | if (ret < 0) { | |
2470 | PERROR("ustctl_get_sequence_number"); | |
2471 | goto error; | |
2472 | } | |
2473 | index->packet_seq_num = htobe64(index->packet_seq_num); | |
2474 | ||
309167d2 JD |
2475 | error: |
2476 | return ret; | |
2477 | } | |
2478 | ||
93ec662e JD |
2479 | static |
2480 | void metadata_stream_reset_cache(struct lttng_consumer_stream *stream, | |
2481 | struct consumer_metadata_cache *cache) | |
2482 | { | |
2483 | DBG("Metadata stream update to version %" PRIu64, | |
2484 | cache->version); | |
2485 | stream->ust_metadata_pushed = 0; | |
2486 | stream->metadata_version = cache->version; | |
2487 | stream->reset_metadata_flag = 1; | |
2488 | } | |
2489 | ||
2490 | /* | |
2491 | * Check if the version of the metadata stream and metadata cache match. | |
2492 | * If the cache got updated, reset the metadata stream. | |
2493 | * The stream lock and metadata cache lock MUST be held. | |
2494 | * Return 0 on success, a negative value on error. | |
2495 | */ | |
2496 | static | |
2497 | int metadata_stream_check_version(struct lttng_consumer_stream *stream) | |
2498 | { | |
2499 | int ret = 0; | |
2500 | struct consumer_metadata_cache *cache = stream->chan->metadata_cache; | |
2501 | ||
2502 | if (cache->version == stream->metadata_version) { | |
2503 | goto end; | |
2504 | } | |
2505 | metadata_stream_reset_cache(stream, cache); | |
2506 | ||
2507 | end: | |
2508 | return ret; | |
2509 | } | |
2510 | ||
94d49140 JD |
2511 | /* |
2512 | * Write up to one packet from the metadata cache to the channel. | |
2513 | * | |
2514 | * Returns the number of bytes pushed in the cache, or a negative value | |
2515 | * on error. | |
2516 | */ | |
2517 | static | |
2518 | int commit_one_metadata_packet(struct lttng_consumer_stream *stream) | |
2519 | { | |
2520 | ssize_t write_len; | |
2521 | int ret; | |
2522 | ||
2523 | pthread_mutex_lock(&stream->chan->metadata_cache->lock); | |
93ec662e JD |
2524 | ret = metadata_stream_check_version(stream); |
2525 | if (ret < 0) { | |
2526 | goto end; | |
2527 | } | |
c585821b | 2528 | if (stream->chan->metadata_cache->max_offset |
94d49140 JD |
2529 | == stream->ust_metadata_pushed) { |
2530 | ret = 0; | |
2531 | goto end; | |
2532 | } | |
2533 | ||
2534 | write_len = ustctl_write_one_packet_to_channel(stream->chan->uchan, | |
2535 | &stream->chan->metadata_cache->data[stream->ust_metadata_pushed], | |
c585821b | 2536 | stream->chan->metadata_cache->max_offset |
94d49140 JD |
2537 | - stream->ust_metadata_pushed); |
2538 | assert(write_len != 0); | |
2539 | if (write_len < 0) { | |
2540 | ERR("Writing one metadata packet"); | |
2541 | ret = -1; | |
2542 | goto end; | |
2543 | } | |
2544 | stream->ust_metadata_pushed += write_len; | |
2545 | ||
c585821b | 2546 | assert(stream->chan->metadata_cache->max_offset >= |
94d49140 JD |
2547 | stream->ust_metadata_pushed); |
2548 | ret = write_len; | |
2549 | ||
d367ba54 JG |
2550 | /* |
2551 | * Switch packet (but don't open the next one) on every commit of | |
2552 | * a metadata packet. Since the subbuffer is fully filled (with padding, | |
2553 | * if needed), the stream is "quiescent" after this commit. | |
2554 | */ | |
2555 | ustctl_flush_buffer(stream->ustream, 1); | |
2556 | stream->quiescent = true; | |
94d49140 JD |
2557 | end: |
2558 | pthread_mutex_unlock(&stream->chan->metadata_cache->lock); | |
2559 | return ret; | |
2560 | } | |
2561 | ||
309167d2 | 2562 | |
94d49140 JD |
2563 | /* |
2564 | * Sync metadata meaning request them to the session daemon and snapshot to the | |
2565 | * metadata thread can consumer them. | |
2566 | * | |
c585821b MD |
2567 | * Metadata stream lock is held here, but we need to release it when |
2568 | * interacting with sessiond, else we cause a deadlock with live | |
2569 | * awaiting on metadata to be pushed out. | |
94d49140 JD |
2570 | * |
2571 | * Return 0 if new metadatda is available, EAGAIN if the metadata stream | |
2572 | * is empty or a negative value on error. | |
2573 | */ | |
2574 | int lttng_ustconsumer_sync_metadata(struct lttng_consumer_local_data *ctx, | |
2575 | struct lttng_consumer_stream *metadata) | |
2576 | { | |
2577 | int ret; | |
2578 | int retry = 0; | |
2579 | ||
2580 | assert(ctx); | |
2581 | assert(metadata); | |
2582 | ||
c585821b | 2583 | pthread_mutex_unlock(&metadata->lock); |
94d49140 JD |
2584 | /* |
2585 | * Request metadata from the sessiond, but don't wait for the flush | |
2586 | * because we locked the metadata thread. | |
2587 | */ | |
2588 | ret = lttng_ustconsumer_request_metadata(ctx, metadata->chan, 0, 0); | |
1caeb2eb | 2589 | pthread_mutex_lock(&metadata->lock); |
94d49140 JD |
2590 | if (ret < 0) { |
2591 | goto end; | |
2592 | } | |
2593 | ||
2594 | ret = commit_one_metadata_packet(metadata); | |
2595 | if (ret <= 0) { | |
2596 | goto end; | |
2597 | } else if (ret > 0) { | |
2598 | retry = 1; | |
2599 | } | |
2600 | ||
94d49140 JD |
2601 | ret = ustctl_snapshot(metadata->ustream); |
2602 | if (ret < 0) { | |
2603 | if (errno != EAGAIN) { | |
2604 | ERR("Sync metadata, taking UST snapshot"); | |
2605 | goto end; | |
2606 | } | |
2607 | DBG("No new metadata when syncing them."); | |
2608 | /* No new metadata, exit. */ | |
2609 | ret = ENODATA; | |
2610 | goto end; | |
2611 | } | |
2612 | ||
2613 | /* | |
2614 | * After this flush, we still need to extract metadata. | |
2615 | */ | |
2616 | if (retry) { | |
2617 | ret = EAGAIN; | |
2618 | } | |
2619 | ||
2620 | end: | |
2621 | return ret; | |
2622 | } | |
2623 | ||
02b3d176 DG |
2624 | /* |
2625 | * Return 0 on success else a negative value. | |
2626 | */ | |
2627 | static int notify_if_more_data(struct lttng_consumer_stream *stream, | |
2628 | struct lttng_consumer_local_data *ctx) | |
2629 | { | |
2630 | int ret; | |
2631 | struct ustctl_consumer_stream *ustream; | |
2632 | ||
2633 | assert(stream); | |
2634 | assert(ctx); | |
2635 | ||
2636 | ustream = stream->ustream; | |
2637 | ||
2638 | /* | |
2639 | * First, we are going to check if there is a new subbuffer available | |
2640 | * before reading the stream wait_fd. | |
2641 | */ | |
2642 | /* Get the next subbuffer */ | |
2643 | ret = ustctl_get_next_subbuf(ustream); | |
2644 | if (ret) { | |
2645 | /* No more data found, flag the stream. */ | |
2646 | stream->has_data = 0; | |
2647 | ret = 0; | |
2648 | goto end; | |
2649 | } | |
2650 | ||
5420e5db | 2651 | ret = ustctl_put_subbuf(ustream); |
02b3d176 DG |
2652 | assert(!ret); |
2653 | ||
2654 | /* This stream still has data. Flag it and wake up the data thread. */ | |
2655 | stream->has_data = 1; | |
2656 | ||
2657 | if (stream->monitor && !stream->hangup_flush_done && !ctx->has_wakeup) { | |
2658 | ssize_t writelen; | |
2659 | ||
2660 | writelen = lttng_pipe_write(ctx->consumer_wakeup_pipe, "!", 1); | |
2661 | if (writelen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) { | |
2662 | ret = writelen; | |
2663 | goto end; | |
2664 | } | |
2665 | ||
2666 | /* The wake up pipe has been notified. */ | |
2667 | ctx->has_wakeup = 1; | |
2668 | } | |
2669 | ret = 0; | |
2670 | ||
2671 | end: | |
2672 | return ret; | |
2673 | } | |
2674 | ||
fb83fe64 JD |
2675 | static |
2676 | int update_stream_stats(struct lttng_consumer_stream *stream) | |
2677 | { | |
2678 | int ret; | |
2679 | uint64_t seq, discarded; | |
2680 | ||
2681 | ret = ustctl_get_sequence_number(stream->ustream, &seq); | |
2682 | if (ret < 0) { | |
2683 | PERROR("ustctl_get_sequence_number"); | |
2684 | goto end; | |
2685 | } | |
2686 | /* | |
2687 | * Start the sequence when we extract the first packet in case we don't | |
2688 | * start at 0 (for example if a consumer is not connected to the | |
2689 | * session immediately after the beginning). | |
2690 | */ | |
2691 | if (stream->last_sequence_number == -1ULL) { | |
2692 | stream->last_sequence_number = seq; | |
2693 | } else if (seq > stream->last_sequence_number) { | |
2694 | stream->chan->lost_packets += seq - | |
2695 | stream->last_sequence_number - 1; | |
2696 | } else { | |
2697 | /* seq <= last_sequence_number */ | |
2698 | ERR("Sequence number inconsistent : prev = %" PRIu64 | |
2699 | ", current = %" PRIu64, | |
2700 | stream->last_sequence_number, seq); | |
2701 | ret = -1; | |
2702 | goto end; | |
2703 | } | |
2704 | stream->last_sequence_number = seq; | |
2705 | ||
2706 | ret = ustctl_get_events_discarded(stream->ustream, &discarded); | |
2707 | if (ret < 0) { | |
2708 | PERROR("kernctl_get_events_discarded"); | |
2709 | goto end; | |
2710 | } | |
2711 | if (discarded < stream->last_discarded_events) { | |
2712 | /* | |
83f4233d MJ |
2713 | * Overflow has occurred. We assume only one wrap-around |
2714 | * has occurred. | |
fb83fe64 JD |
2715 | */ |
2716 | stream->chan->discarded_events += | |
2717 | (1ULL << (CAA_BITS_PER_LONG - 1)) - | |
2718 | stream->last_discarded_events + discarded; | |
2719 | } else { | |
2720 | stream->chan->discarded_events += discarded - | |
2721 | stream->last_discarded_events; | |
2722 | } | |
2723 | stream->last_discarded_events = discarded; | |
2724 | ret = 0; | |
2725 | ||
2726 | end: | |
2727 | return ret; | |
2728 | } | |
2729 | ||
94d49140 JD |
2730 | /* |
2731 | * Read subbuffer from the given stream. | |
2732 | * | |
e5148e25 | 2733 | * Stream and channel locks MUST be acquired by the caller. |
94d49140 JD |
2734 | * |
2735 | * Return 0 on success else a negative value. | |
2736 | */ | |
d41f73b7 | 2737 | int lttng_ustconsumer_read_subbuffer(struct lttng_consumer_stream *stream, |
e5148e25 | 2738 | struct lttng_consumer_local_data *ctx) |
d41f73b7 | 2739 | { |
1d4dfdef | 2740 | unsigned long len, subbuf_size, padding; |
02d02e31 | 2741 | int err, write_index = 1, rotation_ret; |
d41f73b7 | 2742 | long ret = 0; |
ffe60014 | 2743 | struct ustctl_consumer_stream *ustream; |
50adc264 | 2744 | struct ctf_packet_index index; |
ffe60014 DG |
2745 | |
2746 | assert(stream); | |
2747 | assert(stream->ustream); | |
2748 | assert(ctx); | |
d41f73b7 | 2749 | |
3eb914c0 | 2750 | DBG("In UST read_subbuffer (wait_fd: %d, name: %s)", stream->wait_fd, |
ffe60014 DG |
2751 | stream->name); |
2752 | ||
2753 | /* Ease our life for what's next. */ | |
2754 | ustream = stream->ustream; | |
d41f73b7 | 2755 | |
6cd525e8 | 2756 | /* |
02b3d176 DG |
2757 | * We can consume the 1 byte written into the wait_fd by UST. Don't trigger |
2758 | * error if we cannot read this one byte (read returns 0), or if the error | |
2759 | * is EAGAIN or EWOULDBLOCK. | |
2760 | * | |
2761 | * This is only done when the stream is monitored by a thread, before the | |
2762 | * flush is done after a hangup and if the stream is not flagged with data | |
2763 | * since there might be nothing to consume in the wait fd but still have | |
2764 | * data available flagged by the consumer wake up pipe. | |
6cd525e8 | 2765 | */ |
02b3d176 DG |
2766 | if (stream->monitor && !stream->hangup_flush_done && !stream->has_data) { |
2767 | char dummy; | |
c617c0c6 MD |
2768 | ssize_t readlen; |
2769 | ||
6cd525e8 MD |
2770 | readlen = lttng_read(stream->wait_fd, &dummy, 1); |
2771 | if (readlen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) { | |
effcf122 | 2772 | ret = readlen; |
02d02e31 JD |
2773 | goto error; |
2774 | } | |
2775 | } | |
2776 | ||
2777 | /* | |
2778 | * If the stream was flagged to be ready for rotation before we extract the | |
2779 | * next packet, rotate it now. | |
2780 | */ | |
2781 | if (stream->rotate_ready) { | |
2782 | DBG("Rotate stream before extracting data"); | |
e5148e25 | 2783 | rotation_ret = lttng_consumer_rotate_stream(ctx, stream); |
02d02e31 JD |
2784 | if (rotation_ret < 0) { |
2785 | ERR("Stream rotation error"); | |
2786 | ret = -1; | |
2787 | goto error; | |
effcf122 | 2788 | } |
d41f73b7 MD |
2789 | } |
2790 | ||
04ef1097 | 2791 | retry: |
d41f73b7 | 2792 | /* Get the next subbuffer */ |
ffe60014 | 2793 | err = ustctl_get_next_subbuf(ustream); |
d41f73b7 | 2794 | if (err != 0) { |
04ef1097 MD |
2795 | /* |
2796 | * Populate metadata info if the existing info has | |
2797 | * already been read. | |
2798 | */ | |
2799 | if (stream->metadata_flag) { | |
94d49140 JD |
2800 | ret = commit_one_metadata_packet(stream); |
2801 | if (ret <= 0) { | |
02d02e31 | 2802 | goto error; |
04ef1097 | 2803 | } |
04ef1097 MD |
2804 | goto retry; |
2805 | } | |
2806 | ||
1d4dfdef | 2807 | ret = err; /* ustctl_get_next_subbuf returns negative, caller expect positive. */ |
d41f73b7 MD |
2808 | /* |
2809 | * This is a debug message even for single-threaded consumer, | |
2810 | * because poll() have more relaxed criterions than get subbuf, | |
2811 | * so get_subbuf may fail for short race windows where poll() | |
2812 | * would issue wakeups. | |
2813 | */ | |
2814 | DBG("Reserving sub buffer failed (everything is normal, " | |
ffe60014 | 2815 | "it is due to concurrency) [ret: %d]", err); |
02d02e31 | 2816 | goto error; |
d41f73b7 | 2817 | } |
ffe60014 | 2818 | assert(stream->chan->output == CONSUMER_CHANNEL_MMAP); |
309167d2 | 2819 | |
1c20f0e2 | 2820 | if (!stream->metadata_flag) { |
309167d2 JD |
2821 | index.offset = htobe64(stream->out_fd_offset); |
2822 | ret = get_index_values(&index, ustream); | |
2823 | if (ret < 0) { | |
7b87473d MD |
2824 | err = ustctl_put_subbuf(ustream); |
2825 | assert(err == 0); | |
02d02e31 | 2826 | goto error; |
309167d2 | 2827 | } |
fb83fe64 JD |
2828 | |
2829 | /* Update the stream's sequence and discarded events count. */ | |
2830 | ret = update_stream_stats(stream); | |
2831 | if (ret < 0) { | |
2832 | PERROR("kernctl_get_events_discarded"); | |
7b87473d MD |
2833 | err = ustctl_put_subbuf(ustream); |
2834 | assert(err == 0); | |
02d02e31 | 2835 | goto error; |
fb83fe64 | 2836 | } |
1c20f0e2 JD |
2837 | } else { |
2838 | write_index = 0; | |
309167d2 JD |
2839 | } |
2840 | ||
1d4dfdef | 2841 | /* Get the full padded subbuffer size */ |
ffe60014 | 2842 | err = ustctl_get_padded_subbuf_size(ustream, &len); |
effcf122 | 2843 | assert(err == 0); |
1d4dfdef DG |
2844 | |
2845 | /* Get subbuffer data size (without padding) */ | |
ffe60014 | 2846 | err = ustctl_get_subbuf_size(ustream, &subbuf_size); |
1d4dfdef DG |
2847 | assert(err == 0); |
2848 | ||
2849 | /* Make sure we don't get a subbuffer size bigger than the padded */ | |
2850 | assert(len >= subbuf_size); | |
2851 | ||
2852 | padding = len - subbuf_size; | |
02d02e31 | 2853 | |
d41f73b7 | 2854 | /* write the subbuffer to the tracefile */ |
309167d2 | 2855 | ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, padding, &index); |
91dfef6e DG |
2856 | /* |
2857 | * The mmap operation should write subbuf_size amount of data when network | |
2858 | * streaming or the full padding (len) size when we are _not_ streaming. | |
2859 | */ | |
d88aee68 DG |
2860 | if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) || |
2861 | (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) { | |
d41f73b7 | 2862 | /* |
91dfef6e | 2863 | * Display the error but continue processing to try to release the |
c5c45efa DG |
2864 | * subbuffer. This is a DBG statement since any unexpected kill or |
2865 | * signal, the application gets unregistered, relayd gets closed or | |
2866 | * anything that affects the buffer lifetime will trigger this error. | |
2867 | * So, for the sake of the user, don't print this error since it can | |
2868 | * happen and it is OK with the code flow. | |
d41f73b7 | 2869 | */ |
c5c45efa | 2870 | DBG("Error writing to tracefile " |
8fd623e0 | 2871 | "(ret: %ld != len: %lu != subbuf_size: %lu)", |
91dfef6e | 2872 | ret, len, subbuf_size); |
309167d2 | 2873 | write_index = 0; |
d41f73b7 | 2874 | } |
ffe60014 | 2875 | err = ustctl_put_next_subbuf(ustream); |
effcf122 | 2876 | assert(err == 0); |
331744e3 | 2877 | |
02b3d176 DG |
2878 | /* |
2879 | * This will consumer the byte on the wait_fd if and only if there is not | |
2880 | * next subbuffer to be acquired. | |
2881 | */ | |
2882 | if (!stream->metadata_flag) { | |
2883 | ret = notify_if_more_data(stream, ctx); | |
2884 | if (ret < 0) { | |
02d02e31 | 2885 | goto error; |
02b3d176 DG |
2886 | } |
2887 | } | |
2888 | ||
309167d2 | 2889 | /* Write index if needed. */ |
1c20f0e2 | 2890 | if (!write_index) { |
02d02e31 | 2891 | goto rotate; |
1c20f0e2 JD |
2892 | } |
2893 | ||
94d49140 JD |
2894 | if (stream->chan->live_timer_interval && !stream->metadata_flag) { |
2895 | /* | |
2896 | * In live, block until all the metadata is sent. | |
2897 | */ | |
c585821b MD |
2898 | pthread_mutex_lock(&stream->metadata_timer_lock); |
2899 | assert(!stream->missed_metadata_flush); | |
2900 | stream->waiting_on_metadata = true; | |
2901 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
2902 | ||
94d49140 | 2903 | err = consumer_stream_sync_metadata(ctx, stream->session_id); |
c585821b MD |
2904 | |
2905 | pthread_mutex_lock(&stream->metadata_timer_lock); | |
2906 | stream->waiting_on_metadata = false; | |
2907 | if (stream->missed_metadata_flush) { | |
2908 | stream->missed_metadata_flush = false; | |
2909 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
2910 | (void) consumer_flush_ust_index(stream); | |
2911 | } else { | |
2912 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
2913 | } | |
2914 | ||
94d49140 | 2915 | if (err < 0) { |
02d02e31 | 2916 | goto error; |
94d49140 JD |
2917 | } |
2918 | } | |
2919 | ||
1c20f0e2 JD |
2920 | assert(!stream->metadata_flag); |
2921 | err = consumer_stream_write_index(stream, &index); | |
2922 | if (err < 0) { | |
02d02e31 | 2923 | goto error; |
309167d2 JD |
2924 | } |
2925 | ||
02d02e31 JD |
2926 | rotate: |
2927 | /* | |
2928 | * After extracting the packet, we check if the stream is now ready to be | |
2929 | * rotated and perform the action immediately. | |
2930 | */ | |
2931 | rotation_ret = lttng_consumer_stream_is_rotate_ready(stream); | |
2932 | if (rotation_ret == 1) { | |
e5148e25 | 2933 | rotation_ret = lttng_consumer_rotate_stream(ctx, stream); |
02d02e31 JD |
2934 | if (rotation_ret < 0) { |
2935 | ERR("Stream rotation error"); | |
2936 | ret = -1; | |
2937 | goto error; | |
2938 | } | |
2939 | } else if (rotation_ret < 0) { | |
2940 | ERR("Checking if stream is ready to rotate"); | |
2941 | ret = -1; | |
2942 | goto error; | |
2943 | } | |
2944 | error: | |
d41f73b7 MD |
2945 | return ret; |
2946 | } | |
2947 | ||
ffe60014 DG |
2948 | /* |
2949 | * Called when a stream is created. | |
fe4477ee JD |
2950 | * |
2951 | * Return 0 on success or else a negative value. | |
ffe60014 | 2952 | */ |
d41f73b7 MD |
2953 | int lttng_ustconsumer_on_recv_stream(struct lttng_consumer_stream *stream) |
2954 | { | |
fe4477ee JD |
2955 | int ret; |
2956 | ||
10a50311 JD |
2957 | assert(stream); |
2958 | ||
e5148e25 JG |
2959 | /* |
2960 | * Don't create anything if this is set for streaming or if there is | |
2961 | * no current trace chunk on the parent channel. | |
2962 | */ | |
2963 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor && | |
2964 | stream->chan->trace_chunk) { | |
2965 | ret = consumer_stream_create_output_files(stream, true); | |
2966 | if (ret) { | |
fe4477ee JD |
2967 | goto error; |
2968 | } | |
fe4477ee JD |
2969 | } |
2970 | ret = 0; | |
2971 | ||
2972 | error: | |
2973 | return ret; | |
d41f73b7 | 2974 | } |
ca22feea DG |
2975 | |
2976 | /* | |
2977 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
2978 | * stream. Consumer data lock MUST be acquired before calling this function |
2979 | * and the stream lock. | |
ca22feea | 2980 | * |
6d805429 | 2981 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
2982 | * data is available for trace viewer reading. |
2983 | */ | |
6d805429 | 2984 | int lttng_ustconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
2985 | { |
2986 | int ret; | |
2987 | ||
2988 | assert(stream); | |
ffe60014 | 2989 | assert(stream->ustream); |
ca22feea | 2990 | |
6d805429 | 2991 | DBG("UST consumer checking data pending"); |
c8f59ee5 | 2992 | |
ca6b395f MD |
2993 | if (stream->endpoint_status != CONSUMER_ENDPOINT_ACTIVE) { |
2994 | ret = 0; | |
2995 | goto end; | |
2996 | } | |
2997 | ||
04ef1097 | 2998 | if (stream->chan->type == CONSUMER_CHANNEL_TYPE_METADATA) { |
e6ee4eab DG |
2999 | uint64_t contiguous, pushed; |
3000 | ||
3001 | /* Ease our life a bit. */ | |
c585821b | 3002 | contiguous = stream->chan->metadata_cache->max_offset; |
e6ee4eab DG |
3003 | pushed = stream->ust_metadata_pushed; |
3004 | ||
04ef1097 MD |
3005 | /* |
3006 | * We can simply check whether all contiguously available data | |
3007 | * has been pushed to the ring buffer, since the push operation | |
3008 | * is performed within get_next_subbuf(), and because both | |
3009 | * get_next_subbuf() and put_next_subbuf() are issued atomically | |
3010 | * thanks to the stream lock within | |
3011 | * lttng_ustconsumer_read_subbuffer(). This basically means that | |
3012 | * whetnever ust_metadata_pushed is incremented, the associated | |
3013 | * metadata has been consumed from the metadata stream. | |
3014 | */ | |
3015 | DBG("UST consumer metadata pending check: contiguous %" PRIu64 " vs pushed %" PRIu64, | |
e6ee4eab | 3016 | contiguous, pushed); |
aa01b94c | 3017 | assert(((int64_t) (contiguous - pushed)) >= 0); |
e6ee4eab | 3018 | if ((contiguous != pushed) || |
6acdf328 | 3019 | (((int64_t) contiguous - pushed) > 0 || contiguous == 0)) { |
04ef1097 MD |
3020 | ret = 1; /* Data is pending */ |
3021 | goto end; | |
3022 | } | |
3023 | } else { | |
3024 | ret = ustctl_get_next_subbuf(stream->ustream); | |
3025 | if (ret == 0) { | |
3026 | /* | |
3027 | * There is still data so let's put back this | |
3028 | * subbuffer. | |
3029 | */ | |
3030 | ret = ustctl_put_subbuf(stream->ustream); | |
3031 | assert(ret == 0); | |
3032 | ret = 1; /* Data is pending */ | |
3033 | goto end; | |
3034 | } | |
ca22feea DG |
3035 | } |
3036 | ||
6d805429 DG |
3037 | /* Data is NOT pending so ready to be read. */ |
3038 | ret = 0; | |
ca22feea | 3039 | |
6efae65e DG |
3040 | end: |
3041 | return ret; | |
ca22feea | 3042 | } |
d88aee68 | 3043 | |
6d574024 DG |
3044 | /* |
3045 | * Stop a given metadata channel timer if enabled and close the wait fd which | |
3046 | * is the poll pipe of the metadata stream. | |
3047 | * | |
cb187b25 | 3048 | * This MUST be called with the metadata channel lock acquired. |
6d574024 DG |
3049 | */ |
3050 | void lttng_ustconsumer_close_metadata(struct lttng_consumer_channel *metadata) | |
3051 | { | |
3052 | int ret; | |
3053 | ||
3054 | assert(metadata); | |
3055 | assert(metadata->type == CONSUMER_CHANNEL_TYPE_METADATA); | |
3056 | ||
3057 | DBG("Closing metadata channel key %" PRIu64, metadata->key); | |
3058 | ||
3059 | if (metadata->switch_timer_enabled == 1) { | |
3060 | consumer_timer_switch_stop(metadata); | |
3061 | } | |
3062 | ||
3063 | if (!metadata->metadata_stream) { | |
3064 | goto end; | |
3065 | } | |
3066 | ||
3067 | /* | |
3068 | * Closing write side so the thread monitoring the stream wakes up if any | |
3069 | * and clean the metadata stream. | |
3070 | */ | |
3071 | if (metadata->metadata_stream->ust_metadata_poll_pipe[1] >= 0) { | |
3072 | ret = close(metadata->metadata_stream->ust_metadata_poll_pipe[1]); | |
3073 | if (ret < 0) { | |
3074 | PERROR("closing metadata pipe write side"); | |
3075 | } | |
3076 | metadata->metadata_stream->ust_metadata_poll_pipe[1] = -1; | |
3077 | } | |
3078 | ||
3079 | end: | |
3080 | return; | |
3081 | } | |
3082 | ||
d88aee68 DG |
3083 | /* |
3084 | * Close every metadata stream wait fd of the metadata hash table. This | |
3085 | * function MUST be used very carefully so not to run into a race between the | |
3086 | * metadata thread handling streams and this function closing their wait fd. | |
3087 | * | |
3088 | * For UST, this is used when the session daemon hangs up. Its the metadata | |
3089 | * producer so calling this is safe because we are assured that no state change | |
3090 | * can occur in the metadata thread for the streams in the hash table. | |
3091 | */ | |
6d574024 | 3092 | void lttng_ustconsumer_close_all_metadata(struct lttng_ht *metadata_ht) |
d88aee68 | 3093 | { |
d88aee68 DG |
3094 | struct lttng_ht_iter iter; |
3095 | struct lttng_consumer_stream *stream; | |
3096 | ||
3097 | assert(metadata_ht); | |
3098 | assert(metadata_ht->ht); | |
3099 | ||
3100 | DBG("UST consumer closing all metadata streams"); | |
3101 | ||
3102 | rcu_read_lock(); | |
3103 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, | |
3104 | node.node) { | |
9ce5646a MD |
3105 | |
3106 | health_code_update(); | |
3107 | ||
be2b50c7 | 3108 | pthread_mutex_lock(&stream->chan->lock); |
6d574024 | 3109 | lttng_ustconsumer_close_metadata(stream->chan); |
be2b50c7 DG |
3110 | pthread_mutex_unlock(&stream->chan->lock); |
3111 | ||
d88aee68 DG |
3112 | } |
3113 | rcu_read_unlock(); | |
3114 | } | |
d8ef542d MD |
3115 | |
3116 | void lttng_ustconsumer_close_stream_wakeup(struct lttng_consumer_stream *stream) | |
3117 | { | |
3118 | int ret; | |
3119 | ||
3120 | ret = ustctl_stream_close_wakeup_fd(stream->ustream); | |
3121 | if (ret < 0) { | |
3122 | ERR("Unable to close wakeup fd"); | |
3123 | } | |
3124 | } | |
331744e3 | 3125 | |
f666ae70 MD |
3126 | /* |
3127 | * Please refer to consumer-timer.c before adding any lock within this | |
3128 | * function or any of its callees. Timers have a very strict locking | |
3129 | * semantic with respect to teardown. Failure to respect this semantic | |
3130 | * introduces deadlocks. | |
c585821b MD |
3131 | * |
3132 | * DON'T hold the metadata lock when calling this function, else this | |
3133 | * can cause deadlock involving consumer awaiting for metadata to be | |
3134 | * pushed out due to concurrent interaction with the session daemon. | |
f666ae70 | 3135 | */ |
331744e3 | 3136 | int lttng_ustconsumer_request_metadata(struct lttng_consumer_local_data *ctx, |
94d49140 | 3137 | struct lttng_consumer_channel *channel, int timer, int wait) |
331744e3 JD |
3138 | { |
3139 | struct lttcomm_metadata_request_msg request; | |
3140 | struct lttcomm_consumer_msg msg; | |
0c759fc9 | 3141 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
93ec662e | 3142 | uint64_t len, key, offset, version; |
331744e3 JD |
3143 | int ret; |
3144 | ||
3145 | assert(channel); | |
3146 | assert(channel->metadata_cache); | |
3147 | ||
53efb85a MD |
3148 | memset(&request, 0, sizeof(request)); |
3149 | ||
331744e3 JD |
3150 | /* send the metadata request to sessiond */ |
3151 | switch (consumer_data.type) { | |
3152 | case LTTNG_CONSUMER64_UST: | |
3153 | request.bits_per_long = 64; | |
3154 | break; | |
3155 | case LTTNG_CONSUMER32_UST: | |
3156 | request.bits_per_long = 32; | |
3157 | break; | |
3158 | default: | |
3159 | request.bits_per_long = 0; | |
3160 | break; | |
3161 | } | |
3162 | ||
3163 | request.session_id = channel->session_id; | |
1950109e | 3164 | request.session_id_per_pid = channel->session_id_per_pid; |
567eb353 DG |
3165 | /* |
3166 | * Request the application UID here so the metadata of that application can | |
3167 | * be sent back. The channel UID corresponds to the user UID of the session | |
3168 | * used for the rights on the stream file(s). | |
3169 | */ | |
3170 | request.uid = channel->ust_app_uid; | |
331744e3 | 3171 | request.key = channel->key; |
567eb353 | 3172 | |
1950109e | 3173 | DBG("Sending metadata request to sessiond, session id %" PRIu64 |
3e25d926 | 3174 | ", per-pid %" PRIu64 ", app UID %u and channel key %" PRIu64, |
567eb353 DG |
3175 | request.session_id, request.session_id_per_pid, request.uid, |
3176 | request.key); | |
331744e3 | 3177 | |
75d83e50 | 3178 | pthread_mutex_lock(&ctx->metadata_socket_lock); |
9ce5646a MD |
3179 | |
3180 | health_code_update(); | |
3181 | ||
331744e3 JD |
3182 | ret = lttcomm_send_unix_sock(ctx->consumer_metadata_socket, &request, |
3183 | sizeof(request)); | |
3184 | if (ret < 0) { | |
3185 | ERR("Asking metadata to sessiond"); | |
3186 | goto end; | |
3187 | } | |
3188 | ||
9ce5646a MD |
3189 | health_code_update(); |
3190 | ||
331744e3 JD |
3191 | /* Receive the metadata from sessiond */ |
3192 | ret = lttcomm_recv_unix_sock(ctx->consumer_metadata_socket, &msg, | |
3193 | sizeof(msg)); | |
3194 | if (ret != sizeof(msg)) { | |
8fd623e0 | 3195 | DBG("Consumer received unexpected message size %d (expects %zu)", |
331744e3 JD |
3196 | ret, sizeof(msg)); |
3197 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); | |
3198 | /* | |
3199 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
3200 | * since the caller handles this. | |
3201 | */ | |
3202 | goto end; | |
3203 | } | |
3204 | ||
9ce5646a MD |
3205 | health_code_update(); |
3206 | ||
331744e3 JD |
3207 | if (msg.cmd_type == LTTNG_ERR_UND) { |
3208 | /* No registry found */ | |
3209 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, | |
3210 | ret_code); | |
3211 | ret = 0; | |
3212 | goto end; | |
3213 | } else if (msg.cmd_type != LTTNG_CONSUMER_PUSH_METADATA) { | |
3214 | ERR("Unexpected cmd_type received %d", msg.cmd_type); | |
3215 | ret = -1; | |
3216 | goto end; | |
3217 | } | |
3218 | ||
3219 | len = msg.u.push_metadata.len; | |
3220 | key = msg.u.push_metadata.key; | |
3221 | offset = msg.u.push_metadata.target_offset; | |
93ec662e | 3222 | version = msg.u.push_metadata.version; |
331744e3 JD |
3223 | |
3224 | assert(key == channel->key); | |
3225 | if (len == 0) { | |
3226 | DBG("No new metadata to receive for key %" PRIu64, key); | |
3227 | } | |
3228 | ||
9ce5646a MD |
3229 | health_code_update(); |
3230 | ||
331744e3 JD |
3231 | /* Tell session daemon we are ready to receive the metadata. */ |
3232 | ret = consumer_send_status_msg(ctx->consumer_metadata_socket, | |
0c759fc9 | 3233 | LTTCOMM_CONSUMERD_SUCCESS); |
331744e3 JD |
3234 | if (ret < 0 || len == 0) { |
3235 | /* | |
3236 | * Somehow, the session daemon is not responding anymore or there is | |
3237 | * nothing to receive. | |
3238 | */ | |
3239 | goto end; | |
3240 | } | |
3241 | ||
9ce5646a MD |
3242 | health_code_update(); |
3243 | ||
1eb682be | 3244 | ret = lttng_ustconsumer_recv_metadata(ctx->consumer_metadata_socket, |
93ec662e | 3245 | key, offset, len, version, channel, timer, wait); |
1eb682be | 3246 | if (ret >= 0) { |
f2a444f1 DG |
3247 | /* |
3248 | * Only send the status msg if the sessiond is alive meaning a positive | |
3249 | * ret code. | |
3250 | */ | |
1eb682be | 3251 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, ret); |
f2a444f1 | 3252 | } |
331744e3 JD |
3253 | ret = 0; |
3254 | ||
3255 | end: | |
9ce5646a MD |
3256 | health_code_update(); |
3257 | ||
75d83e50 | 3258 | pthread_mutex_unlock(&ctx->metadata_socket_lock); |
331744e3 JD |
3259 | return ret; |
3260 | } | |
70190e1c DG |
3261 | |
3262 | /* | |
3263 | * Return the ustctl call for the get stream id. | |
3264 | */ | |
3265 | int lttng_ustconsumer_get_stream_id(struct lttng_consumer_stream *stream, | |
3266 | uint64_t *stream_id) | |
3267 | { | |
3268 | assert(stream); | |
3269 | assert(stream_id); | |
3270 | ||
3271 | return ustctl_get_stream_id(stream->ustream, stream_id); | |
3272 | } |