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> |
0857097f | 35 | |
51a9e1c7 | 36 | #include <bin/lttng-consumerd/health-consumerd.h> |
990570ed | 37 | #include <common/common.h> |
10a8a223 | 38 | #include <common/sessiond-comm/sessiond-comm.h> |
00e2e675 | 39 | #include <common/relayd/relayd.h> |
dbb5dfe6 | 40 | #include <common/compat/fcntl.h> |
f263b7fd | 41 | #include <common/compat/endian.h> |
c8fea79c JR |
42 | #include <common/consumer/consumer-metadata-cache.h> |
43 | #include <common/consumer/consumer-stream.h> | |
44 | #include <common/consumer/consumer-timer.h> | |
fe4477ee | 45 | #include <common/utils.h> |
309167d2 | 46 | #include <common/index/index.h> |
10a8a223 DG |
47 | |
48 | #include "ust-consumer.h" | |
3bd1e081 | 49 | |
45863397 | 50 | #define INT_MAX_STR_LEN 12 /* includes \0 */ |
4628484a | 51 | |
3bd1e081 MD |
52 | extern struct lttng_consumer_global_data consumer_data; |
53 | extern int consumer_poll_timeout; | |
3bd1e081 MD |
54 | |
55 | /* | |
ffe60014 DG |
56 | * Free channel object and all streams associated with it. This MUST be used |
57 | * only and only if the channel has _NEVER_ been added to the global channel | |
58 | * hash table. | |
3bd1e081 | 59 | */ |
ffe60014 | 60 | static void destroy_channel(struct lttng_consumer_channel *channel) |
3bd1e081 | 61 | { |
ffe60014 DG |
62 | struct lttng_consumer_stream *stream, *stmp; |
63 | ||
64 | assert(channel); | |
65 | ||
66 | DBG("UST consumer cleaning stream list"); | |
67 | ||
68 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
69 | send_node) { | |
9ce5646a MD |
70 | |
71 | health_code_update(); | |
72 | ||
ffe60014 DG |
73 | cds_list_del(&stream->send_node); |
74 | ustctl_destroy_stream(stream->ustream); | |
75 | free(stream); | |
76 | } | |
77 | ||
78 | /* | |
79 | * If a channel is available meaning that was created before the streams | |
80 | * were, delete it. | |
81 | */ | |
82 | if (channel->uchan) { | |
83 | lttng_ustconsumer_del_channel(channel); | |
b83e03c4 | 84 | lttng_ustconsumer_free_channel(channel); |
ffe60014 DG |
85 | } |
86 | free(channel); | |
87 | } | |
3bd1e081 MD |
88 | |
89 | /* | |
ffe60014 | 90 | * Add channel to internal consumer state. |
3bd1e081 | 91 | * |
ffe60014 | 92 | * Returns 0 on success or else a negative value. |
3bd1e081 | 93 | */ |
ffe60014 DG |
94 | static int add_channel(struct lttng_consumer_channel *channel, |
95 | struct lttng_consumer_local_data *ctx) | |
3bd1e081 MD |
96 | { |
97 | int ret = 0; | |
98 | ||
ffe60014 DG |
99 | assert(channel); |
100 | assert(ctx); | |
101 | ||
102 | if (ctx->on_recv_channel != NULL) { | |
103 | ret = ctx->on_recv_channel(channel); | |
104 | if (ret == 0) { | |
d8ef542d | 105 | ret = consumer_add_channel(channel, ctx); |
ffe60014 DG |
106 | } else if (ret < 0) { |
107 | /* Most likely an ENOMEM. */ | |
108 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
109 | goto error; | |
110 | } | |
111 | } else { | |
d8ef542d | 112 | ret = consumer_add_channel(channel, ctx); |
3bd1e081 MD |
113 | } |
114 | ||
d88aee68 | 115 | DBG("UST consumer channel added (key: %" PRIu64 ")", channel->key); |
ffe60014 DG |
116 | |
117 | error: | |
3bd1e081 MD |
118 | return ret; |
119 | } | |
120 | ||
121 | /* | |
ffe60014 DG |
122 | * Allocate and return a consumer channel object. |
123 | */ | |
124 | static struct lttng_consumer_channel *allocate_channel(uint64_t session_id, | |
125 | const char *pathname, const char *name, uid_t uid, gid_t gid, | |
da009f2c | 126 | uint64_t relayd_id, uint64_t key, enum lttng_event_output output, |
2bba9e53 | 127 | uint64_t tracefile_size, uint64_t tracefile_count, |
ecc48a90 | 128 | uint64_t session_id_per_pid, unsigned int monitor, |
d7ba1388 | 129 | unsigned int live_timer_interval, |
3d071855 | 130 | const char *root_shm_path, const char *shm_path) |
ffe60014 DG |
131 | { |
132 | assert(pathname); | |
133 | assert(name); | |
134 | ||
1950109e JD |
135 | return consumer_allocate_channel(key, session_id, pathname, name, uid, |
136 | gid, relayd_id, output, tracefile_size, | |
d7ba1388 | 137 | tracefile_count, session_id_per_pid, monitor, |
3d071855 | 138 | live_timer_interval, root_shm_path, shm_path); |
ffe60014 DG |
139 | } |
140 | ||
141 | /* | |
142 | * Allocate and return a consumer stream object. If _alloc_ret is not NULL, the | |
143 | * error value if applicable is set in it else it is kept untouched. | |
3bd1e081 | 144 | * |
ffe60014 | 145 | * Return NULL on error else the newly allocated stream object. |
3bd1e081 | 146 | */ |
ffe60014 DG |
147 | static struct lttng_consumer_stream *allocate_stream(int cpu, int key, |
148 | struct lttng_consumer_channel *channel, | |
149 | struct lttng_consumer_local_data *ctx, int *_alloc_ret) | |
150 | { | |
151 | int alloc_ret; | |
152 | struct lttng_consumer_stream *stream = NULL; | |
153 | ||
154 | assert(channel); | |
155 | assert(ctx); | |
156 | ||
157 | stream = consumer_allocate_stream(channel->key, | |
158 | key, | |
159 | LTTNG_CONSUMER_ACTIVE_STREAM, | |
160 | channel->name, | |
161 | channel->uid, | |
162 | channel->gid, | |
163 | channel->relayd_id, | |
164 | channel->session_id, | |
165 | cpu, | |
166 | &alloc_ret, | |
4891ece8 DG |
167 | channel->type, |
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 | ||
187 | stream->chan = channel; | |
188 | ||
189 | error: | |
190 | if (_alloc_ret) { | |
191 | *_alloc_ret = alloc_ret; | |
192 | } | |
193 | return stream; | |
194 | } | |
195 | ||
196 | /* | |
197 | * Send the given stream pointer to the corresponding thread. | |
198 | * | |
199 | * Returns 0 on success else a negative value. | |
200 | */ | |
201 | static int send_stream_to_thread(struct lttng_consumer_stream *stream, | |
202 | struct lttng_consumer_local_data *ctx) | |
203 | { | |
dae10966 DG |
204 | int ret; |
205 | struct lttng_pipe *stream_pipe; | |
ffe60014 DG |
206 | |
207 | /* Get the right pipe where the stream will be sent. */ | |
208 | if (stream->metadata_flag) { | |
5ab66908 MD |
209 | ret = consumer_add_metadata_stream(stream); |
210 | if (ret) { | |
211 | ERR("Consumer add metadata stream %" PRIu64 " failed.", | |
212 | stream->key); | |
213 | goto error; | |
214 | } | |
dae10966 | 215 | stream_pipe = ctx->consumer_metadata_pipe; |
ffe60014 | 216 | } else { |
5ab66908 MD |
217 | ret = consumer_add_data_stream(stream); |
218 | if (ret) { | |
219 | ERR("Consumer add stream %" PRIu64 " failed.", | |
220 | stream->key); | |
221 | goto error; | |
222 | } | |
dae10966 | 223 | stream_pipe = ctx->consumer_data_pipe; |
ffe60014 DG |
224 | } |
225 | ||
5ab66908 MD |
226 | /* |
227 | * From this point on, the stream's ownership has been moved away from | |
a8086cf4 JR |
228 | * the channel and it becomes globally visible. Hence, remove it from |
229 | * the local stream list to prevent the stream from being both local and | |
230 | * global. | |
5ab66908 MD |
231 | */ |
232 | stream->globally_visible = 1; | |
a8086cf4 | 233 | cds_list_del(&stream->send_node); |
5ab66908 | 234 | |
dae10966 | 235 | ret = lttng_pipe_write(stream_pipe, &stream, sizeof(stream)); |
ffe60014 | 236 | if (ret < 0) { |
dae10966 DG |
237 | ERR("Consumer write %s stream to pipe %d", |
238 | stream->metadata_flag ? "metadata" : "data", | |
239 | lttng_pipe_get_writefd(stream_pipe)); | |
5ab66908 MD |
240 | if (stream->metadata_flag) { |
241 | consumer_del_stream_for_metadata(stream); | |
242 | } else { | |
243 | consumer_del_stream_for_data(stream); | |
244 | } | |
a8086cf4 | 245 | goto error; |
ffe60014 | 246 | } |
a8086cf4 | 247 | |
5ab66908 | 248 | error: |
ffe60014 DG |
249 | return ret; |
250 | } | |
251 | ||
4628484a MD |
252 | static |
253 | int get_stream_shm_path(char *stream_shm_path, const char *shm_path, int cpu) | |
254 | { | |
45863397 | 255 | char cpu_nr[INT_MAX_STR_LEN]; /* int max len */ |
4628484a MD |
256 | int ret; |
257 | ||
258 | strncpy(stream_shm_path, shm_path, PATH_MAX); | |
259 | stream_shm_path[PATH_MAX - 1] = '\0'; | |
45863397 | 260 | ret = snprintf(cpu_nr, INT_MAX_STR_LEN, "%i", cpu); |
67f8cb8d MD |
261 | if (ret < 0) { |
262 | PERROR("snprintf"); | |
4628484a MD |
263 | goto end; |
264 | } | |
265 | strncat(stream_shm_path, cpu_nr, | |
266 | PATH_MAX - strlen(stream_shm_path) - 1); | |
267 | ret = 0; | |
268 | end: | |
269 | return ret; | |
270 | } | |
271 | ||
d88aee68 DG |
272 | /* |
273 | * Create streams for the given channel using liblttng-ust-ctl. | |
274 | * | |
275 | * Return 0 on success else a negative value. | |
276 | */ | |
ffe60014 DG |
277 | static int create_ust_streams(struct lttng_consumer_channel *channel, |
278 | struct lttng_consumer_local_data *ctx) | |
279 | { | |
280 | int ret, cpu = 0; | |
281 | struct ustctl_consumer_stream *ustream; | |
282 | struct lttng_consumer_stream *stream; | |
283 | ||
284 | assert(channel); | |
285 | assert(ctx); | |
286 | ||
287 | /* | |
288 | * While a stream is available from ustctl. When NULL is returned, we've | |
289 | * reached the end of the possible stream for the channel. | |
290 | */ | |
291 | while ((ustream = ustctl_create_stream(channel->uchan, cpu))) { | |
292 | int wait_fd; | |
04ef1097 | 293 | int ust_metadata_pipe[2]; |
ffe60014 | 294 | |
9ce5646a MD |
295 | health_code_update(); |
296 | ||
04ef1097 MD |
297 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && channel->monitor) { |
298 | ret = utils_create_pipe_cloexec_nonblock(ust_metadata_pipe); | |
299 | if (ret < 0) { | |
300 | ERR("Create ust metadata poll pipe"); | |
301 | goto error; | |
302 | } | |
303 | wait_fd = ust_metadata_pipe[0]; | |
304 | } else { | |
305 | wait_fd = ustctl_stream_get_wait_fd(ustream); | |
306 | } | |
ffe60014 DG |
307 | |
308 | /* Allocate consumer stream object. */ | |
309 | stream = allocate_stream(cpu, wait_fd, channel, ctx, &ret); | |
310 | if (!stream) { | |
311 | goto error_alloc; | |
312 | } | |
313 | stream->ustream = ustream; | |
314 | /* | |
315 | * Store it so we can save multiple function calls afterwards since | |
316 | * this value is used heavily in the stream threads. This is UST | |
317 | * specific so this is why it's done after allocation. | |
318 | */ | |
319 | stream->wait_fd = wait_fd; | |
320 | ||
b31398bb DG |
321 | /* |
322 | * Increment channel refcount since the channel reference has now been | |
323 | * assigned in the allocation process above. | |
324 | */ | |
10a50311 JD |
325 | if (stream->chan->monitor) { |
326 | uatomic_inc(&stream->chan->refcount); | |
327 | } | |
b31398bb | 328 | |
ffe60014 DG |
329 | /* |
330 | * Order is important this is why a list is used. On error, the caller | |
331 | * should clean this list. | |
332 | */ | |
333 | cds_list_add_tail(&stream->send_node, &channel->streams.head); | |
334 | ||
335 | ret = ustctl_get_max_subbuf_size(stream->ustream, | |
336 | &stream->max_sb_size); | |
337 | if (ret < 0) { | |
338 | ERR("ustctl_get_max_subbuf_size failed for stream %s", | |
339 | stream->name); | |
340 | goto error; | |
341 | } | |
342 | ||
343 | /* Do actions once stream has been received. */ | |
344 | if (ctx->on_recv_stream) { | |
345 | ret = ctx->on_recv_stream(stream); | |
346 | if (ret < 0) { | |
347 | goto error; | |
348 | } | |
349 | } | |
350 | ||
d88aee68 | 351 | DBG("UST consumer add stream %s (key: %" PRIu64 ") with relayd id %" PRIu64, |
ffe60014 DG |
352 | stream->name, stream->key, stream->relayd_stream_id); |
353 | ||
354 | /* Set next CPU stream. */ | |
355 | channel->streams.count = ++cpu; | |
d88aee68 DG |
356 | |
357 | /* Keep stream reference when creating metadata. */ | |
358 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) { | |
359 | channel->metadata_stream = stream; | |
8de4f941 JG |
360 | if (channel->monitor) { |
361 | /* Set metadata poll pipe if we created one */ | |
362 | memcpy(stream->ust_metadata_poll_pipe, | |
363 | ust_metadata_pipe, | |
364 | sizeof(ust_metadata_pipe)); | |
365 | } | |
d88aee68 | 366 | } |
ffe60014 DG |
367 | } |
368 | ||
369 | return 0; | |
370 | ||
371 | error: | |
372 | error_alloc: | |
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 | ||
418 | static int open_ust_stream_fd(struct lttng_consumer_channel *channel, | |
419 | struct ustctl_consumer_channel_attr *attr, | |
420 | int cpu) | |
421 | { | |
422 | char shm_path[PATH_MAX]; | |
423 | int ret; | |
424 | ||
425 | if (!channel->shm_path[0]) { | |
426 | return create_posix_shm(); | |
427 | } | |
428 | ret = get_stream_shm_path(shm_path, channel->shm_path, cpu); | |
429 | if (ret) { | |
430 | goto error_shm_path; | |
431 | } | |
432 | return run_as_open(shm_path, | |
433 | O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR, | |
434 | channel->uid, channel->gid); | |
435 | ||
436 | error_shm_path: | |
437 | return -1; | |
438 | } | |
439 | ||
ffe60014 DG |
440 | /* |
441 | * Create an UST channel with the given attributes and send it to the session | |
442 | * daemon using the ust ctl API. | |
443 | * | |
444 | * Return 0 on success or else a negative value. | |
445 | */ | |
4628484a MD |
446 | static int create_ust_channel(struct lttng_consumer_channel *channel, |
447 | struct ustctl_consumer_channel_attr *attr, | |
448 | struct ustctl_consumer_channel **ust_chanp) | |
ffe60014 | 449 | { |
4628484a MD |
450 | int ret, nr_stream_fds, i, j; |
451 | int *stream_fds; | |
452 | struct ustctl_consumer_channel *ust_channel; | |
ffe60014 | 453 | |
4628484a | 454 | assert(channel); |
ffe60014 | 455 | assert(attr); |
4628484a | 456 | assert(ust_chanp); |
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++) { | |
475 | stream_fds[i] = open_ust_stream_fd(channel, attr, i); | |
476 | if (stream_fds[i] < 0) { | |
477 | ret = -1; | |
478 | goto error_open; | |
479 | } | |
480 | } | |
481 | ust_channel = ustctl_create_channel(attr, stream_fds, nr_stream_fds); | |
482 | if (!ust_channel) { | |
ffe60014 DG |
483 | ret = -1; |
484 | goto error_create; | |
485 | } | |
4628484a MD |
486 | channel->nr_stream_fds = nr_stream_fds; |
487 | channel->stream_fds = stream_fds; | |
488 | *ust_chanp = ust_channel; | |
ffe60014 DG |
489 | |
490 | return 0; | |
491 | ||
492 | error_create: | |
4628484a MD |
493 | error_open: |
494 | for (j = i - 1; j >= 0; j--) { | |
495 | int closeret; | |
496 | ||
497 | closeret = close(stream_fds[j]); | |
498 | if (closeret) { | |
499 | PERROR("close"); | |
500 | } | |
501 | if (channel->shm_path[0]) { | |
502 | char shm_path[PATH_MAX]; | |
503 | ||
504 | closeret = get_stream_shm_path(shm_path, | |
505 | channel->shm_path, j); | |
506 | if (closeret) { | |
507 | ERR("Cannot get stream shm path"); | |
508 | } | |
509 | closeret = run_as_unlink(shm_path, | |
510 | channel->uid, channel->gid); | |
511 | if (closeret) { | |
4628484a MD |
512 | PERROR("unlink %s", shm_path); |
513 | } | |
514 | } | |
515 | } | |
516 | /* Try to rmdir all directories under shm_path root. */ | |
517 | if (channel->root_shm_path[0]) { | |
602766ec | 518 | (void) run_as_rmdir_recursive(channel->root_shm_path, |
4628484a MD |
519 | channel->uid, channel->gid); |
520 | } | |
521 | free(stream_fds); | |
522 | error_alloc: | |
ffe60014 DG |
523 | return ret; |
524 | } | |
525 | ||
d88aee68 DG |
526 | /* |
527 | * Send a single given stream to the session daemon using the sock. | |
528 | * | |
529 | * Return 0 on success else a negative value. | |
530 | */ | |
ffe60014 DG |
531 | static int send_sessiond_stream(int sock, struct lttng_consumer_stream *stream) |
532 | { | |
533 | int ret; | |
534 | ||
535 | assert(stream); | |
536 | assert(sock >= 0); | |
537 | ||
3eb914c0 | 538 | DBG("UST consumer sending stream %" PRIu64 " to sessiond", stream->key); |
ffe60014 DG |
539 | |
540 | /* Send stream to session daemon. */ | |
541 | ret = ustctl_send_stream_to_sessiond(sock, stream->ustream); | |
542 | if (ret < 0) { | |
543 | goto error; | |
544 | } | |
545 | ||
ffe60014 DG |
546 | error: |
547 | return ret; | |
548 | } | |
549 | ||
550 | /* | |
551 | * Send channel to sessiond. | |
552 | * | |
d88aee68 | 553 | * Return 0 on success or else a negative value. |
ffe60014 DG |
554 | */ |
555 | static int send_sessiond_channel(int sock, | |
556 | struct lttng_consumer_channel *channel, | |
557 | struct lttng_consumer_local_data *ctx, int *relayd_error) | |
558 | { | |
0c759fc9 | 559 | int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
ffe60014 | 560 | struct lttng_consumer_stream *stream; |
a4baae1b | 561 | uint64_t net_seq_idx = -1ULL; |
ffe60014 DG |
562 | |
563 | assert(channel); | |
564 | assert(ctx); | |
565 | assert(sock >= 0); | |
566 | ||
567 | DBG("UST consumer sending channel %s to sessiond", channel->name); | |
568 | ||
62285ea4 DG |
569 | if (channel->relayd_id != (uint64_t) -1ULL) { |
570 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
571 | |
572 | health_code_update(); | |
573 | ||
62285ea4 DG |
574 | /* Try to send the stream to the relayd if one is available. */ |
575 | ret = consumer_send_relayd_stream(stream, stream->chan->pathname); | |
576 | if (ret < 0) { | |
577 | /* | |
578 | * Flag that the relayd was the problem here probably due to a | |
579 | * communicaton error on the socket. | |
580 | */ | |
581 | if (relayd_error) { | |
582 | *relayd_error = 1; | |
583 | } | |
725d28b2 | 584 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
ffe60014 | 585 | } |
a4baae1b JD |
586 | if (net_seq_idx == -1ULL) { |
587 | net_seq_idx = stream->net_seq_idx; | |
588 | } | |
589 | } | |
f2a444f1 | 590 | } |
ffe60014 | 591 | |
f2a444f1 DG |
592 | /* Inform sessiond that we are about to send channel and streams. */ |
593 | ret = consumer_send_status_msg(sock, ret_code); | |
0c759fc9 | 594 | if (ret < 0 || ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
f2a444f1 DG |
595 | /* |
596 | * Either the session daemon is not responding or the relayd died so we | |
597 | * stop now. | |
598 | */ | |
599 | goto error; | |
600 | } | |
601 | ||
602 | /* Send channel to sessiond. */ | |
603 | ret = ustctl_send_channel_to_sessiond(sock, channel->uchan); | |
604 | if (ret < 0) { | |
605 | goto error; | |
606 | } | |
607 | ||
608 | ret = ustctl_channel_close_wakeup_fd(channel->uchan); | |
609 | if (ret < 0) { | |
610 | goto error; | |
611 | } | |
612 | ||
613 | /* The channel was sent successfully to the sessiond at this point. */ | |
614 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
615 | |
616 | health_code_update(); | |
617 | ||
ffe60014 DG |
618 | /* Send stream to session daemon. */ |
619 | ret = send_sessiond_stream(sock, stream); | |
620 | if (ret < 0) { | |
621 | goto error; | |
622 | } | |
623 | } | |
624 | ||
625 | /* Tell sessiond there is no more stream. */ | |
626 | ret = ustctl_send_stream_to_sessiond(sock, NULL); | |
627 | if (ret < 0) { | |
628 | goto error; | |
629 | } | |
630 | ||
631 | DBG("UST consumer NULL stream sent to sessiond"); | |
632 | ||
633 | return 0; | |
634 | ||
635 | error: | |
0c759fc9 | 636 | if (ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
f2a444f1 DG |
637 | ret = -1; |
638 | } | |
ffe60014 DG |
639 | return ret; |
640 | } | |
641 | ||
642 | /* | |
643 | * Creates a channel and streams and add the channel it to the channel internal | |
644 | * state. The created stream must ONLY be sent once the GET_CHANNEL command is | |
645 | * received. | |
646 | * | |
647 | * Return 0 on success or else, a negative value is returned and the channel | |
648 | * MUST be destroyed by consumer_del_channel(). | |
649 | */ | |
650 | static int ask_channel(struct lttng_consumer_local_data *ctx, int sock, | |
651 | struct lttng_consumer_channel *channel, | |
652 | struct ustctl_consumer_channel_attr *attr) | |
3bd1e081 MD |
653 | { |
654 | int ret; | |
655 | ||
ffe60014 DG |
656 | assert(ctx); |
657 | assert(channel); | |
658 | assert(attr); | |
659 | ||
660 | /* | |
661 | * This value is still used by the kernel consumer since for the kernel, | |
662 | * the stream ownership is not IN the consumer so we need to have the | |
663 | * number of left stream that needs to be initialized so we can know when | |
664 | * to delete the channel (see consumer.c). | |
665 | * | |
666 | * As for the user space tracer now, the consumer creates and sends the | |
667 | * stream to the session daemon which only sends them to the application | |
668 | * once every stream of a channel is received making this value useless | |
669 | * because we they will be added to the poll thread before the application | |
670 | * receives them. This ensures that a stream can not hang up during | |
671 | * initilization of a channel. | |
672 | */ | |
673 | channel->nb_init_stream_left = 0; | |
674 | ||
675 | /* The reply msg status is handled in the following call. */ | |
4628484a | 676 | ret = create_ust_channel(channel, attr, &channel->uchan); |
ffe60014 | 677 | if (ret < 0) { |
10a50311 | 678 | goto end; |
3bd1e081 MD |
679 | } |
680 | ||
d8ef542d MD |
681 | channel->wait_fd = ustctl_channel_get_wait_fd(channel->uchan); |
682 | ||
10a50311 JD |
683 | /* |
684 | * For the snapshots (no monitor), we create the metadata streams | |
685 | * on demand, not during the channel creation. | |
686 | */ | |
687 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && !channel->monitor) { | |
688 | ret = 0; | |
689 | goto end; | |
690 | } | |
691 | ||
ffe60014 DG |
692 | /* Open all streams for this channel. */ |
693 | ret = create_ust_streams(channel, ctx); | |
694 | if (ret < 0) { | |
10a50311 | 695 | goto end; |
ffe60014 DG |
696 | } |
697 | ||
10a50311 | 698 | end: |
3bd1e081 MD |
699 | return ret; |
700 | } | |
701 | ||
d88aee68 DG |
702 | /* |
703 | * Send all stream of a channel to the right thread handling it. | |
704 | * | |
705 | * On error, return a negative value else 0 on success. | |
706 | */ | |
707 | static int send_streams_to_thread(struct lttng_consumer_channel *channel, | |
708 | struct lttng_consumer_local_data *ctx) | |
709 | { | |
710 | int ret = 0; | |
711 | struct lttng_consumer_stream *stream, *stmp; | |
712 | ||
713 | assert(channel); | |
714 | assert(ctx); | |
715 | ||
716 | /* Send streams to the corresponding thread. */ | |
717 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
718 | send_node) { | |
9ce5646a MD |
719 | |
720 | health_code_update(); | |
721 | ||
d88aee68 DG |
722 | /* Sending the stream to the thread. */ |
723 | ret = send_stream_to_thread(stream, ctx); | |
724 | if (ret < 0) { | |
725 | /* | |
726 | * If we are unable to send the stream to the thread, there is | |
727 | * a big problem so just stop everything. | |
728 | */ | |
729 | goto error; | |
730 | } | |
d88aee68 DG |
731 | } |
732 | ||
733 | error: | |
734 | return ret; | |
735 | } | |
736 | ||
7972aab2 DG |
737 | /* |
738 | * Flush channel's streams using the given key to retrieve the channel. | |
739 | * | |
740 | * Return 0 on success else an LTTng error code. | |
741 | */ | |
742 | static int flush_channel(uint64_t chan_key) | |
743 | { | |
744 | int ret = 0; | |
745 | struct lttng_consumer_channel *channel; | |
746 | struct lttng_consumer_stream *stream; | |
747 | struct lttng_ht *ht; | |
748 | struct lttng_ht_iter iter; | |
749 | ||
8fd623e0 | 750 | DBG("UST consumer flush channel key %" PRIu64, chan_key); |
7972aab2 | 751 | |
a500c257 | 752 | rcu_read_lock(); |
7972aab2 DG |
753 | channel = consumer_find_channel(chan_key); |
754 | if (!channel) { | |
8fd623e0 | 755 | ERR("UST consumer flush channel %" PRIu64 " not found", chan_key); |
7972aab2 DG |
756 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
757 | goto error; | |
758 | } | |
759 | ||
760 | ht = consumer_data.stream_per_chan_id_ht; | |
761 | ||
762 | /* For each stream of the channel id, flush it. */ | |
7972aab2 DG |
763 | cds_lfht_for_each_entry_duplicate(ht->ht, |
764 | ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct, | |
765 | &channel->key, &iter.iter, stream, node_channel_id.node) { | |
9ce5646a MD |
766 | |
767 | health_code_update(); | |
768 | ||
0dd01979 MD |
769 | pthread_mutex_lock(&stream->lock); |
770 | if (!stream->quiescent) { | |
771 | ustctl_flush_buffer(stream->ustream, 0); | |
772 | stream->quiescent = true; | |
773 | } | |
774 | pthread_mutex_unlock(&stream->lock); | |
775 | } | |
776 | error: | |
777 | rcu_read_unlock(); | |
778 | return ret; | |
779 | } | |
780 | ||
781 | /* | |
782 | * Clear quiescent state from channel's streams using the given key to | |
783 | * retrieve the channel. | |
784 | * | |
785 | * Return 0 on success else an LTTng error code. | |
786 | */ | |
787 | static int clear_quiescent_channel(uint64_t chan_key) | |
788 | { | |
789 | int ret = 0; | |
790 | struct lttng_consumer_channel *channel; | |
791 | struct lttng_consumer_stream *stream; | |
792 | struct lttng_ht *ht; | |
793 | struct lttng_ht_iter iter; | |
794 | ||
795 | DBG("UST consumer clear quiescent channel key %" PRIu64, chan_key); | |
796 | ||
797 | rcu_read_lock(); | |
798 | channel = consumer_find_channel(chan_key); | |
799 | if (!channel) { | |
800 | ERR("UST consumer clear quiescent channel %" PRIu64 " not found", chan_key); | |
801 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
802 | goto error; | |
803 | } | |
804 | ||
805 | ht = consumer_data.stream_per_chan_id_ht; | |
806 | ||
807 | /* For each stream of the channel id, clear quiescent state. */ | |
808 | cds_lfht_for_each_entry_duplicate(ht->ht, | |
809 | ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct, | |
810 | &channel->key, &iter.iter, stream, node_channel_id.node) { | |
811 | ||
812 | health_code_update(); | |
813 | ||
814 | pthread_mutex_lock(&stream->lock); | |
815 | stream->quiescent = false; | |
816 | pthread_mutex_unlock(&stream->lock); | |
7972aab2 | 817 | } |
7972aab2 | 818 | error: |
a500c257 | 819 | rcu_read_unlock(); |
7972aab2 DG |
820 | return ret; |
821 | } | |
822 | ||
d88aee68 DG |
823 | /* |
824 | * Close metadata stream wakeup_fd using the given key to retrieve the channel. | |
a500c257 | 825 | * RCU read side lock MUST be acquired before calling this function. |
d88aee68 DG |
826 | * |
827 | * Return 0 on success else an LTTng error code. | |
828 | */ | |
829 | static int close_metadata(uint64_t chan_key) | |
830 | { | |
ea88ca2a | 831 | int ret = 0; |
d88aee68 DG |
832 | struct lttng_consumer_channel *channel; |
833 | ||
8fd623e0 | 834 | DBG("UST consumer close metadata key %" PRIu64, chan_key); |
d88aee68 DG |
835 | |
836 | channel = consumer_find_channel(chan_key); | |
837 | if (!channel) { | |
84cc9aa0 DG |
838 | /* |
839 | * This is possible if the metadata thread has issue a delete because | |
840 | * the endpoint point of the stream hung up. There is no way the | |
841 | * session daemon can know about it thus use a DBG instead of an actual | |
842 | * error. | |
843 | */ | |
844 | DBG("UST consumer close metadata %" PRIu64 " not found", chan_key); | |
d88aee68 DG |
845 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
846 | goto error; | |
847 | } | |
848 | ||
ea88ca2a | 849 | pthread_mutex_lock(&consumer_data.lock); |
a9838785 | 850 | pthread_mutex_lock(&channel->lock); |
73811ecc DG |
851 | |
852 | if (cds_lfht_is_node_deleted(&channel->node.node)) { | |
853 | goto error_unlock; | |
854 | } | |
855 | ||
6d574024 | 856 | lttng_ustconsumer_close_metadata(channel); |
d88aee68 | 857 | |
ea88ca2a | 858 | error_unlock: |
a9838785 | 859 | pthread_mutex_unlock(&channel->lock); |
ea88ca2a | 860 | pthread_mutex_unlock(&consumer_data.lock); |
d88aee68 DG |
861 | error: |
862 | return ret; | |
863 | } | |
864 | ||
865 | /* | |
866 | * RCU read side lock MUST be acquired before calling this function. | |
867 | * | |
868 | * Return 0 on success else an LTTng error code. | |
869 | */ | |
870 | static int setup_metadata(struct lttng_consumer_local_data *ctx, uint64_t key) | |
871 | { | |
872 | int ret; | |
873 | struct lttng_consumer_channel *metadata; | |
874 | ||
8fd623e0 | 875 | DBG("UST consumer setup metadata key %" PRIu64, key); |
d88aee68 DG |
876 | |
877 | metadata = consumer_find_channel(key); | |
878 | if (!metadata) { | |
879 | ERR("UST consumer push metadata %" PRIu64 " not found", key); | |
880 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
10a50311 JD |
881 | goto end; |
882 | } | |
883 | ||
884 | /* | |
885 | * In no monitor mode, the metadata channel has no stream(s) so skip the | |
886 | * ownership transfer to the metadata thread. | |
887 | */ | |
888 | if (!metadata->monitor) { | |
889 | DBG("Metadata channel in no monitor"); | |
890 | ret = 0; | |
891 | goto end; | |
d88aee68 DG |
892 | } |
893 | ||
894 | /* | |
895 | * Send metadata stream to relayd if one available. Availability is | |
896 | * known if the stream is still in the list of the channel. | |
897 | */ | |
898 | if (cds_list_empty(&metadata->streams.head)) { | |
899 | ERR("Metadata channel key %" PRIu64 ", no stream available.", key); | |
900 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
f5a0c9cf | 901 | goto error_no_stream; |
d88aee68 DG |
902 | } |
903 | ||
904 | /* Send metadata stream to relayd if needed. */ | |
62285ea4 DG |
905 | if (metadata->metadata_stream->net_seq_idx != (uint64_t) -1ULL) { |
906 | ret = consumer_send_relayd_stream(metadata->metadata_stream, | |
907 | metadata->pathname); | |
908 | if (ret < 0) { | |
909 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
910 | goto error; | |
911 | } | |
601262d6 JD |
912 | ret = consumer_send_relayd_streams_sent( |
913 | metadata->metadata_stream->net_seq_idx); | |
914 | if (ret < 0) { | |
915 | ret = LTTCOMM_CONSUMERD_RELAYD_FAIL; | |
916 | goto error; | |
917 | } | |
d88aee68 DG |
918 | } |
919 | ||
a8086cf4 JR |
920 | /* |
921 | * Ownership of metadata stream is passed along. Freeing is handled by | |
922 | * the callee. | |
923 | */ | |
d88aee68 DG |
924 | ret = send_streams_to_thread(metadata, ctx); |
925 | if (ret < 0) { | |
926 | /* | |
927 | * If we are unable to send the stream to the thread, there is | |
928 | * a big problem so just stop everything. | |
929 | */ | |
930 | ret = LTTCOMM_CONSUMERD_FATAL; | |
a8086cf4 | 931 | goto send_streams_error; |
d88aee68 DG |
932 | } |
933 | /* List MUST be empty after or else it could be reused. */ | |
934 | assert(cds_list_empty(&metadata->streams.head)); | |
935 | ||
10a50311 JD |
936 | ret = 0; |
937 | goto end; | |
d88aee68 DG |
938 | |
939 | error: | |
f2a444f1 DG |
940 | /* |
941 | * Delete metadata channel on error. At this point, the metadata stream can | |
942 | * NOT be monitored by the metadata thread thus having the guarantee that | |
943 | * the stream is still in the local stream list of the channel. This call | |
944 | * will make sure to clean that list. | |
945 | */ | |
f5a0c9cf | 946 | consumer_stream_destroy(metadata->metadata_stream, NULL); |
212d67a2 DG |
947 | cds_list_del(&metadata->metadata_stream->send_node); |
948 | metadata->metadata_stream = NULL; | |
a8086cf4 | 949 | send_streams_error: |
f5a0c9cf | 950 | error_no_stream: |
10a50311 JD |
951 | end: |
952 | return ret; | |
953 | } | |
954 | ||
955 | /* | |
956 | * Snapshot the whole metadata. | |
957 | * | |
958 | * Returns 0 on success, < 0 on error | |
959 | */ | |
960 | static int snapshot_metadata(uint64_t key, char *path, uint64_t relayd_id, | |
961 | struct lttng_consumer_local_data *ctx) | |
962 | { | |
963 | int ret = 0; | |
10a50311 JD |
964 | struct lttng_consumer_channel *metadata_channel; |
965 | struct lttng_consumer_stream *metadata_stream; | |
966 | ||
967 | assert(path); | |
968 | assert(ctx); | |
969 | ||
970 | DBG("UST consumer snapshot metadata with key %" PRIu64 " at path %s", | |
971 | key, path); | |
972 | ||
973 | rcu_read_lock(); | |
974 | ||
975 | metadata_channel = consumer_find_channel(key); | |
976 | if (!metadata_channel) { | |
6a00837f MD |
977 | ERR("UST snapshot metadata channel not found for key %" PRIu64, |
978 | key); | |
10a50311 JD |
979 | ret = -1; |
980 | goto error; | |
981 | } | |
982 | assert(!metadata_channel->monitor); | |
983 | ||
9ce5646a MD |
984 | health_code_update(); |
985 | ||
10a50311 JD |
986 | /* |
987 | * Ask the sessiond if we have new metadata waiting and update the | |
988 | * consumer metadata cache. | |
989 | */ | |
94d49140 | 990 | ret = lttng_ustconsumer_request_metadata(ctx, metadata_channel, 0, 1); |
10a50311 JD |
991 | if (ret < 0) { |
992 | goto error; | |
993 | } | |
994 | ||
9ce5646a MD |
995 | health_code_update(); |
996 | ||
10a50311 JD |
997 | /* |
998 | * The metadata stream is NOT created in no monitor mode when the channel | |
999 | * is created on a sessiond ask channel command. | |
1000 | */ | |
1001 | ret = create_ust_streams(metadata_channel, ctx); | |
1002 | if (ret < 0) { | |
1003 | goto error; | |
1004 | } | |
1005 | ||
1006 | metadata_stream = metadata_channel->metadata_stream; | |
1007 | assert(metadata_stream); | |
1008 | ||
1009 | if (relayd_id != (uint64_t) -1ULL) { | |
1010 | metadata_stream->net_seq_idx = relayd_id; | |
1011 | ret = consumer_send_relayd_stream(metadata_stream, path); | |
1012 | if (ret < 0) { | |
1013 | goto error_stream; | |
1014 | } | |
1015 | } else { | |
1016 | ret = utils_create_stream_file(path, metadata_stream->name, | |
1017 | metadata_stream->chan->tracefile_size, | |
1018 | metadata_stream->tracefile_count_current, | |
309167d2 | 1019 | metadata_stream->uid, metadata_stream->gid, NULL); |
10a50311 JD |
1020 | if (ret < 0) { |
1021 | goto error_stream; | |
1022 | } | |
1023 | metadata_stream->out_fd = ret; | |
1024 | metadata_stream->tracefile_size_current = 0; | |
1025 | } | |
1026 | ||
04ef1097 | 1027 | do { |
9ce5646a MD |
1028 | health_code_update(); |
1029 | ||
10a50311 JD |
1030 | ret = lttng_consumer_read_subbuffer(metadata_stream, ctx); |
1031 | if (ret < 0) { | |
94d49140 | 1032 | goto error_stream; |
10a50311 | 1033 | } |
04ef1097 | 1034 | } while (ret > 0); |
10a50311 | 1035 | |
10a50311 JD |
1036 | error_stream: |
1037 | /* | |
1038 | * Clean up the stream completly because the next snapshot will use a new | |
1039 | * metadata stream. | |
1040 | */ | |
10a50311 | 1041 | consumer_stream_destroy(metadata_stream, NULL); |
212d67a2 | 1042 | cds_list_del(&metadata_stream->send_node); |
10a50311 JD |
1043 | metadata_channel->metadata_stream = NULL; |
1044 | ||
1045 | error: | |
1046 | rcu_read_unlock(); | |
1047 | return ret; | |
1048 | } | |
1049 | ||
1050 | /* | |
1051 | * Take a snapshot of all the stream of a channel. | |
1052 | * | |
1053 | * Returns 0 on success, < 0 on error | |
1054 | */ | |
1055 | static int snapshot_channel(uint64_t key, char *path, uint64_t relayd_id, | |
d07ceecd | 1056 | uint64_t nb_packets_per_stream, struct lttng_consumer_local_data *ctx) |
10a50311 JD |
1057 | { |
1058 | int ret; | |
1059 | unsigned use_relayd = 0; | |
1060 | unsigned long consumed_pos, produced_pos; | |
1061 | struct lttng_consumer_channel *channel; | |
1062 | struct lttng_consumer_stream *stream; | |
1063 | ||
1064 | assert(path); | |
1065 | assert(ctx); | |
1066 | ||
1067 | rcu_read_lock(); | |
1068 | ||
1069 | if (relayd_id != (uint64_t) -1ULL) { | |
1070 | use_relayd = 1; | |
1071 | } | |
1072 | ||
1073 | channel = consumer_find_channel(key); | |
1074 | if (!channel) { | |
6a00837f | 1075 | ERR("UST snapshot channel not found for key %" PRIu64, key); |
10a50311 JD |
1076 | ret = -1; |
1077 | goto error; | |
1078 | } | |
1079 | assert(!channel->monitor); | |
6a00837f | 1080 | DBG("UST consumer snapshot channel %" PRIu64, key); |
10a50311 JD |
1081 | |
1082 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
1083 | health_code_update(); |
1084 | ||
10a50311 JD |
1085 | /* Lock stream because we are about to change its state. */ |
1086 | pthread_mutex_lock(&stream->lock); | |
1087 | stream->net_seq_idx = relayd_id; | |
1088 | ||
1089 | if (use_relayd) { | |
1090 | ret = consumer_send_relayd_stream(stream, path); | |
1091 | if (ret < 0) { | |
1092 | goto error_unlock; | |
1093 | } | |
1094 | } else { | |
1095 | ret = utils_create_stream_file(path, stream->name, | |
1096 | stream->chan->tracefile_size, | |
1097 | stream->tracefile_count_current, | |
309167d2 | 1098 | stream->uid, stream->gid, NULL); |
10a50311 JD |
1099 | if (ret < 0) { |
1100 | goto error_unlock; | |
1101 | } | |
1102 | stream->out_fd = ret; | |
1103 | stream->tracefile_size_current = 0; | |
1104 | ||
1105 | DBG("UST consumer snapshot stream %s/%s (%" PRIu64 ")", path, | |
1106 | stream->name, stream->key); | |
1107 | } | |
1108 | ||
d4d80f77 MD |
1109 | /* |
1110 | * If tracing is active, we want to perform a "full" buffer flush. | |
1111 | * Else, if quiescent, it has already been done by the prior stop. | |
1112 | */ | |
1113 | if (!stream->quiescent) { | |
1114 | ustctl_flush_buffer(stream->ustream, 0); | |
1115 | } | |
10a50311 JD |
1116 | |
1117 | ret = lttng_ustconsumer_take_snapshot(stream); | |
1118 | if (ret < 0) { | |
1119 | ERR("Taking UST snapshot"); | |
1120 | goto error_unlock; | |
1121 | } | |
1122 | ||
1123 | ret = lttng_ustconsumer_get_produced_snapshot(stream, &produced_pos); | |
1124 | if (ret < 0) { | |
1125 | ERR("Produced UST snapshot position"); | |
1126 | goto error_unlock; | |
1127 | } | |
1128 | ||
1129 | ret = lttng_ustconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
1130 | if (ret < 0) { | |
1131 | ERR("Consumerd UST snapshot position"); | |
1132 | goto error_unlock; | |
1133 | } | |
1134 | ||
5c786ded JD |
1135 | /* |
1136 | * The original value is sent back if max stream size is larger than | |
d07ceecd | 1137 | * the possible size of the snapshot. Also, we assume that the session |
5c786ded JD |
1138 | * daemon should never send a maximum stream size that is lower than |
1139 | * subbuffer size. | |
1140 | */ | |
d07ceecd MD |
1141 | consumed_pos = consumer_get_consume_start_pos(consumed_pos, |
1142 | produced_pos, nb_packets_per_stream, | |
1143 | stream->max_sb_size); | |
5c786ded | 1144 | |
10a50311 JD |
1145 | while (consumed_pos < produced_pos) { |
1146 | ssize_t read_len; | |
1147 | unsigned long len, padded_len; | |
1148 | ||
9ce5646a MD |
1149 | health_code_update(); |
1150 | ||
10a50311 JD |
1151 | DBG("UST consumer taking snapshot at pos %lu", consumed_pos); |
1152 | ||
1153 | ret = ustctl_get_subbuf(stream->ustream, &consumed_pos); | |
1154 | if (ret < 0) { | |
1155 | if (ret != -EAGAIN) { | |
1156 | PERROR("ustctl_get_subbuf snapshot"); | |
1157 | goto error_close_stream; | |
1158 | } | |
1159 | DBG("UST consumer get subbuf failed. Skipping it."); | |
1160 | consumed_pos += stream->max_sb_size; | |
ddc93ee4 | 1161 | stream->chan->lost_packets++; |
10a50311 JD |
1162 | continue; |
1163 | } | |
1164 | ||
1165 | ret = ustctl_get_subbuf_size(stream->ustream, &len); | |
1166 | if (ret < 0) { | |
1167 | ERR("Snapshot ustctl_get_subbuf_size"); | |
1168 | goto error_put_subbuf; | |
1169 | } | |
1170 | ||
1171 | ret = ustctl_get_padded_subbuf_size(stream->ustream, &padded_len); | |
1172 | if (ret < 0) { | |
1173 | ERR("Snapshot ustctl_get_padded_subbuf_size"); | |
1174 | goto error_put_subbuf; | |
1175 | } | |
1176 | ||
1177 | read_len = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, len, | |
309167d2 | 1178 | padded_len - len, NULL); |
10a50311 JD |
1179 | if (use_relayd) { |
1180 | if (read_len != len) { | |
56591bac | 1181 | ret = -EPERM; |
10a50311 JD |
1182 | goto error_put_subbuf; |
1183 | } | |
1184 | } else { | |
1185 | if (read_len != padded_len) { | |
56591bac | 1186 | ret = -EPERM; |
10a50311 JD |
1187 | goto error_put_subbuf; |
1188 | } | |
1189 | } | |
1190 | ||
1191 | ret = ustctl_put_subbuf(stream->ustream); | |
1192 | if (ret < 0) { | |
1193 | ERR("Snapshot ustctl_put_subbuf"); | |
1194 | goto error_close_stream; | |
1195 | } | |
1196 | consumed_pos += stream->max_sb_size; | |
1197 | } | |
1198 | ||
1199 | /* Simply close the stream so we can use it on the next snapshot. */ | |
1200 | consumer_stream_close(stream); | |
1201 | pthread_mutex_unlock(&stream->lock); | |
1202 | } | |
1203 | ||
1204 | rcu_read_unlock(); | |
1205 | return 0; | |
1206 | ||
1207 | error_put_subbuf: | |
1208 | if (ustctl_put_subbuf(stream->ustream) < 0) { | |
1209 | ERR("Snapshot ustctl_put_subbuf"); | |
1210 | } | |
1211 | error_close_stream: | |
1212 | consumer_stream_close(stream); | |
1213 | error_unlock: | |
1214 | pthread_mutex_unlock(&stream->lock); | |
1215 | error: | |
1216 | rcu_read_unlock(); | |
d88aee68 DG |
1217 | return ret; |
1218 | } | |
1219 | ||
331744e3 | 1220 | /* |
c585821b MD |
1221 | * Receive the metadata updates from the sessiond. Supports receiving |
1222 | * overlapping metadata, but is needs to always belong to a contiguous | |
1223 | * range starting from 0. | |
1224 | * Be careful about the locks held when calling this function: it needs | |
1225 | * the metadata cache flush to concurrently progress in order to | |
1226 | * complete. | |
331744e3 JD |
1227 | */ |
1228 | int lttng_ustconsumer_recv_metadata(int sock, uint64_t key, uint64_t offset, | |
93ec662e JD |
1229 | uint64_t len, uint64_t version, |
1230 | struct lttng_consumer_channel *channel, int timer, int wait) | |
331744e3 | 1231 | { |
0c759fc9 | 1232 | int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
331744e3 JD |
1233 | char *metadata_str; |
1234 | ||
8fd623e0 | 1235 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, len); |
331744e3 JD |
1236 | |
1237 | metadata_str = zmalloc(len * sizeof(char)); | |
1238 | if (!metadata_str) { | |
1239 | PERROR("zmalloc metadata string"); | |
1240 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; | |
1241 | goto end; | |
1242 | } | |
1243 | ||
9ce5646a MD |
1244 | health_code_update(); |
1245 | ||
331744e3 JD |
1246 | /* Receive metadata string. */ |
1247 | ret = lttcomm_recv_unix_sock(sock, metadata_str, len); | |
1248 | if (ret < 0) { | |
1249 | /* Session daemon is dead so return gracefully. */ | |
1250 | ret_code = ret; | |
1251 | goto end_free; | |
1252 | } | |
1253 | ||
9ce5646a MD |
1254 | health_code_update(); |
1255 | ||
331744e3 | 1256 | pthread_mutex_lock(&channel->metadata_cache->lock); |
93ec662e JD |
1257 | ret = consumer_metadata_cache_write(channel, offset, len, version, |
1258 | metadata_str); | |
331744e3 JD |
1259 | if (ret < 0) { |
1260 | /* Unable to handle metadata. Notify session daemon. */ | |
1261 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
a32bd775 DG |
1262 | /* |
1263 | * Skip metadata flush on write error since the offset and len might | |
1264 | * not have been updated which could create an infinite loop below when | |
1265 | * waiting for the metadata cache to be flushed. | |
1266 | */ | |
1267 | pthread_mutex_unlock(&channel->metadata_cache->lock); | |
a32bd775 | 1268 | goto end_free; |
331744e3 JD |
1269 | } |
1270 | pthread_mutex_unlock(&channel->metadata_cache->lock); | |
1271 | ||
94d49140 JD |
1272 | if (!wait) { |
1273 | goto end_free; | |
1274 | } | |
5e41ebe1 | 1275 | while (consumer_metadata_cache_flushed(channel, offset + len, timer)) { |
331744e3 | 1276 | DBG("Waiting for metadata to be flushed"); |
9ce5646a MD |
1277 | |
1278 | health_code_update(); | |
1279 | ||
331744e3 JD |
1280 | usleep(DEFAULT_METADATA_AVAILABILITY_WAIT_TIME); |
1281 | } | |
1282 | ||
1283 | end_free: | |
1284 | free(metadata_str); | |
1285 | end: | |
1286 | return ret_code; | |
1287 | } | |
1288 | ||
4cbc1a04 DG |
1289 | /* |
1290 | * Receive command from session daemon and process it. | |
1291 | * | |
1292 | * Return 1 on success else a negative value or 0. | |
1293 | */ | |
3bd1e081 MD |
1294 | int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
1295 | int sock, struct pollfd *consumer_sockpoll) | |
1296 | { | |
1297 | ssize_t ret; | |
0c759fc9 | 1298 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
3bd1e081 | 1299 | struct lttcomm_consumer_msg msg; |
ffe60014 | 1300 | struct lttng_consumer_channel *channel = NULL; |
3bd1e081 | 1301 | |
9ce5646a MD |
1302 | health_code_update(); |
1303 | ||
3bd1e081 MD |
1304 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); |
1305 | if (ret != sizeof(msg)) { | |
173af62f DG |
1306 | DBG("Consumer received unexpected message size %zd (expects %zu)", |
1307 | ret, sizeof(msg)); | |
3be74084 DG |
1308 | /* |
1309 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
1310 | * since the caller handles this. | |
1311 | */ | |
489f70e9 | 1312 | if (ret > 0) { |
c6857fcf | 1313 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
489f70e9 MD |
1314 | ret = -1; |
1315 | } | |
3bd1e081 MD |
1316 | return ret; |
1317 | } | |
9ce5646a MD |
1318 | |
1319 | health_code_update(); | |
1320 | ||
84382d49 MD |
1321 | /* deprecated */ |
1322 | assert(msg.cmd_type != LTTNG_CONSUMER_STOP); | |
3bd1e081 | 1323 | |
9ce5646a MD |
1324 | health_code_update(); |
1325 | ||
3f8e211f | 1326 | /* relayd needs RCU read-side lock */ |
b0b335c8 MD |
1327 | rcu_read_lock(); |
1328 | ||
3bd1e081 | 1329 | switch (msg.cmd_type) { |
00e2e675 DG |
1330 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
1331 | { | |
f50f23d9 | 1332 | /* Session daemon status message are handled in the following call. */ |
2527bf85 | 1333 | consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
7735ef9e | 1334 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, |
d3e2ba59 JD |
1335 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id, |
1336 | msg.u.relayd_sock.relayd_session_id); | |
00e2e675 DG |
1337 | goto end_nosignal; |
1338 | } | |
173af62f DG |
1339 | case LTTNG_CONSUMER_DESTROY_RELAYD: |
1340 | { | |
a6ba4fe1 | 1341 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
173af62f DG |
1342 | struct consumer_relayd_sock_pair *relayd; |
1343 | ||
a6ba4fe1 | 1344 | DBG("UST consumer destroying relayd %" PRIu64, index); |
173af62f DG |
1345 | |
1346 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 1347 | relayd = consumer_find_relayd(index); |
173af62f | 1348 | if (relayd == NULL) { |
3448e266 | 1349 | DBG("Unable to find relayd %" PRIu64, index); |
e462382a | 1350 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
173af62f DG |
1351 | } |
1352 | ||
a6ba4fe1 DG |
1353 | /* |
1354 | * Each relayd socket pair has a refcount of stream attached to it | |
1355 | * which tells if the relayd is still active or not depending on the | |
1356 | * refcount value. | |
1357 | * | |
1358 | * This will set the destroy flag of the relayd object and destroy it | |
1359 | * if the refcount reaches zero when called. | |
1360 | * | |
1361 | * The destroy can happen either here or when a stream fd hangs up. | |
1362 | */ | |
f50f23d9 DG |
1363 | if (relayd) { |
1364 | consumer_flag_relayd_for_destroy(relayd); | |
1365 | } | |
1366 | ||
d88aee68 | 1367 | goto end_msg_sessiond; |
173af62f | 1368 | } |
3bd1e081 MD |
1369 | case LTTNG_CONSUMER_UPDATE_STREAM: |
1370 | { | |
3f8e211f | 1371 | rcu_read_unlock(); |
7ad0a0cb | 1372 | return -ENOSYS; |
3bd1e081 | 1373 | } |
6d805429 | 1374 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 1375 | { |
3be74084 | 1376 | int ret, is_data_pending; |
6d805429 | 1377 | uint64_t id = msg.u.data_pending.session_id; |
ca22feea | 1378 | |
6d805429 | 1379 | DBG("UST consumer data pending command for id %" PRIu64, id); |
ca22feea | 1380 | |
3be74084 | 1381 | is_data_pending = consumer_data_pending(id); |
ca22feea DG |
1382 | |
1383 | /* Send back returned value to session daemon */ | |
3be74084 DG |
1384 | ret = lttcomm_send_unix_sock(sock, &is_data_pending, |
1385 | sizeof(is_data_pending)); | |
ca22feea | 1386 | if (ret < 0) { |
3be74084 | 1387 | DBG("Error when sending the data pending ret code: %d", ret); |
489f70e9 | 1388 | goto error_fatal; |
ca22feea | 1389 | } |
f50f23d9 DG |
1390 | |
1391 | /* | |
1392 | * No need to send back a status message since the data pending | |
1393 | * returned value is the response. | |
1394 | */ | |
ca22feea | 1395 | break; |
53632229 | 1396 | } |
ffe60014 DG |
1397 | case LTTNG_CONSUMER_ASK_CHANNEL_CREATION: |
1398 | { | |
1399 | int ret; | |
1400 | struct ustctl_consumer_channel_attr attr; | |
1401 | ||
1402 | /* Create a plain object and reserve a channel key. */ | |
1403 | channel = allocate_channel(msg.u.ask_channel.session_id, | |
1404 | msg.u.ask_channel.pathname, msg.u.ask_channel.name, | |
1405 | msg.u.ask_channel.uid, msg.u.ask_channel.gid, | |
1406 | msg.u.ask_channel.relayd_id, msg.u.ask_channel.key, | |
1624d5b7 JD |
1407 | (enum lttng_event_output) msg.u.ask_channel.output, |
1408 | msg.u.ask_channel.tracefile_size, | |
2bba9e53 | 1409 | msg.u.ask_channel.tracefile_count, |
1950109e | 1410 | msg.u.ask_channel.session_id_per_pid, |
ecc48a90 | 1411 | msg.u.ask_channel.monitor, |
d7ba1388 | 1412 | msg.u.ask_channel.live_timer_interval, |
3d071855 | 1413 | msg.u.ask_channel.root_shm_path, |
d7ba1388 | 1414 | msg.u.ask_channel.shm_path); |
ffe60014 DG |
1415 | if (!channel) { |
1416 | goto end_channel_error; | |
1417 | } | |
1418 | ||
567eb353 DG |
1419 | /* |
1420 | * Assign UST application UID to the channel. This value is ignored for | |
1421 | * per PID buffers. This is specific to UST thus setting this after the | |
1422 | * allocation. | |
1423 | */ | |
1424 | channel->ust_app_uid = msg.u.ask_channel.ust_app_uid; | |
1425 | ||
ffe60014 DG |
1426 | /* Build channel attributes from received message. */ |
1427 | attr.subbuf_size = msg.u.ask_channel.subbuf_size; | |
1428 | attr.num_subbuf = msg.u.ask_channel.num_subbuf; | |
1429 | attr.overwrite = msg.u.ask_channel.overwrite; | |
1430 | attr.switch_timer_interval = msg.u.ask_channel.switch_timer_interval; | |
1431 | attr.read_timer_interval = msg.u.ask_channel.read_timer_interval; | |
7972aab2 | 1432 | attr.chan_id = msg.u.ask_channel.chan_id; |
ffe60014 | 1433 | memcpy(attr.uuid, msg.u.ask_channel.uuid, sizeof(attr.uuid)); |
491d1539 | 1434 | attr.blocking_timeout= msg.u.ask_channel.blocking_timeout; |
ffe60014 | 1435 | |
0c759fc9 DG |
1436 | /* Match channel buffer type to the UST abi. */ |
1437 | switch (msg.u.ask_channel.output) { | |
1438 | case LTTNG_EVENT_MMAP: | |
1439 | default: | |
1440 | attr.output = LTTNG_UST_MMAP; | |
1441 | break; | |
1442 | } | |
1443 | ||
ffe60014 DG |
1444 | /* Translate and save channel type. */ |
1445 | switch (msg.u.ask_channel.type) { | |
1446 | case LTTNG_UST_CHAN_PER_CPU: | |
1447 | channel->type = CONSUMER_CHANNEL_TYPE_DATA; | |
1448 | attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8633d6e3 MD |
1449 | /* |
1450 | * Set refcount to 1 for owner. Below, we will | |
1451 | * pass ownership to the | |
1452 | * consumer_thread_channel_poll() thread. | |
1453 | */ | |
1454 | channel->refcount = 1; | |
ffe60014 DG |
1455 | break; |
1456 | case LTTNG_UST_CHAN_METADATA: | |
1457 | channel->type = CONSUMER_CHANNEL_TYPE_METADATA; | |
1458 | attr.type = LTTNG_UST_CHAN_METADATA; | |
1459 | break; | |
1460 | default: | |
1461 | assert(0); | |
1462 | goto error_fatal; | |
1463 | }; | |
1464 | ||
9ce5646a MD |
1465 | health_code_update(); |
1466 | ||
ffe60014 DG |
1467 | ret = ask_channel(ctx, sock, channel, &attr); |
1468 | if (ret < 0) { | |
1469 | goto end_channel_error; | |
1470 | } | |
1471 | ||
fc643247 MD |
1472 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
1473 | ret = consumer_metadata_cache_allocate(channel); | |
1474 | if (ret < 0) { | |
1475 | ERR("Allocating metadata cache"); | |
1476 | goto end_channel_error; | |
1477 | } | |
1478 | consumer_timer_switch_start(channel, attr.switch_timer_interval); | |
1479 | attr.switch_timer_interval = 0; | |
94d49140 | 1480 | } else { |
e9404c27 JG |
1481 | int monitor_start_ret; |
1482 | ||
94d49140 JD |
1483 | consumer_timer_live_start(channel, |
1484 | msg.u.ask_channel.live_timer_interval); | |
e9404c27 JG |
1485 | monitor_start_ret = consumer_timer_monitor_start( |
1486 | channel, | |
1487 | msg.u.ask_channel.monitor_timer_interval); | |
1488 | if (monitor_start_ret < 0) { | |
1489 | ERR("Starting channel monitoring timer failed"); | |
1490 | goto end_channel_error; | |
1491 | } | |
fc643247 MD |
1492 | } |
1493 | ||
9ce5646a MD |
1494 | health_code_update(); |
1495 | ||
ffe60014 DG |
1496 | /* |
1497 | * Add the channel to the internal state AFTER all streams were created | |
1498 | * and successfully sent to session daemon. This way, all streams must | |
1499 | * be ready before this channel is visible to the threads. | |
fc643247 MD |
1500 | * If add_channel succeeds, ownership of the channel is |
1501 | * passed to consumer_thread_channel_poll(). | |
ffe60014 DG |
1502 | */ |
1503 | ret = add_channel(channel, ctx); | |
1504 | if (ret < 0) { | |
ea88ca2a MD |
1505 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
1506 | if (channel->switch_timer_enabled == 1) { | |
1507 | consumer_timer_switch_stop(channel); | |
1508 | } | |
1509 | consumer_metadata_cache_destroy(channel); | |
1510 | } | |
d3e2ba59 JD |
1511 | if (channel->live_timer_enabled == 1) { |
1512 | consumer_timer_live_stop(channel); | |
1513 | } | |
e9404c27 JG |
1514 | if (channel->monitor_timer_enabled == 1) { |
1515 | consumer_timer_monitor_stop(channel); | |
1516 | } | |
ffe60014 DG |
1517 | goto end_channel_error; |
1518 | } | |
1519 | ||
9ce5646a MD |
1520 | health_code_update(); |
1521 | ||
ffe60014 DG |
1522 | /* |
1523 | * Channel and streams are now created. Inform the session daemon that | |
1524 | * everything went well and should wait to receive the channel and | |
1525 | * streams with ustctl API. | |
1526 | */ | |
1527 | ret = consumer_send_status_channel(sock, channel); | |
1528 | if (ret < 0) { | |
1529 | /* | |
489f70e9 | 1530 | * There is probably a problem on the socket. |
ffe60014 | 1531 | */ |
489f70e9 | 1532 | goto error_fatal; |
ffe60014 DG |
1533 | } |
1534 | ||
1535 | break; | |
1536 | } | |
1537 | case LTTNG_CONSUMER_GET_CHANNEL: | |
1538 | { | |
1539 | int ret, relayd_err = 0; | |
d88aee68 | 1540 | uint64_t key = msg.u.get_channel.key; |
ffe60014 | 1541 | struct lttng_consumer_channel *channel; |
ffe60014 DG |
1542 | |
1543 | channel = consumer_find_channel(key); | |
1544 | if (!channel) { | |
8fd623e0 | 1545 | ERR("UST consumer get channel key %" PRIu64 " not found", key); |
e462382a | 1546 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
ffe60014 DG |
1547 | goto end_msg_sessiond; |
1548 | } | |
1549 | ||
9ce5646a MD |
1550 | health_code_update(); |
1551 | ||
ffe60014 DG |
1552 | /* Send everything to sessiond. */ |
1553 | ret = send_sessiond_channel(sock, channel, ctx, &relayd_err); | |
1554 | if (ret < 0) { | |
1555 | if (relayd_err) { | |
1556 | /* | |
1557 | * We were unable to send to the relayd the stream so avoid | |
1558 | * sending back a fatal error to the thread since this is OK | |
f2a444f1 DG |
1559 | * and the consumer can continue its work. The above call |
1560 | * has sent the error status message to the sessiond. | |
ffe60014 | 1561 | */ |
f2a444f1 | 1562 | goto end_nosignal; |
ffe60014 DG |
1563 | } |
1564 | /* | |
1565 | * The communicaton was broken hence there is a bad state between | |
1566 | * the consumer and sessiond so stop everything. | |
1567 | */ | |
1568 | goto error_fatal; | |
1569 | } | |
1570 | ||
9ce5646a MD |
1571 | health_code_update(); |
1572 | ||
10a50311 JD |
1573 | /* |
1574 | * In no monitor mode, the streams ownership is kept inside the channel | |
1575 | * so don't send them to the data thread. | |
1576 | */ | |
1577 | if (!channel->monitor) { | |
1578 | goto end_msg_sessiond; | |
1579 | } | |
1580 | ||
d88aee68 DG |
1581 | ret = send_streams_to_thread(channel, ctx); |
1582 | if (ret < 0) { | |
1583 | /* | |
1584 | * If we are unable to send the stream to the thread, there is | |
1585 | * a big problem so just stop everything. | |
1586 | */ | |
1587 | goto error_fatal; | |
ffe60014 | 1588 | } |
ffe60014 DG |
1589 | /* List MUST be empty after or else it could be reused. */ |
1590 | assert(cds_list_empty(&channel->streams.head)); | |
d88aee68 DG |
1591 | goto end_msg_sessiond; |
1592 | } | |
1593 | case LTTNG_CONSUMER_DESTROY_CHANNEL: | |
1594 | { | |
1595 | uint64_t key = msg.u.destroy_channel.key; | |
d88aee68 | 1596 | |
a0cbdd2e MD |
1597 | /* |
1598 | * Only called if streams have not been sent to stream | |
1599 | * manager thread. However, channel has been sent to | |
1600 | * channel manager thread. | |
1601 | */ | |
1602 | notify_thread_del_channel(ctx, key); | |
d88aee68 | 1603 | goto end_msg_sessiond; |
ffe60014 | 1604 | } |
d88aee68 DG |
1605 | case LTTNG_CONSUMER_CLOSE_METADATA: |
1606 | { | |
1607 | int ret; | |
1608 | ||
1609 | ret = close_metadata(msg.u.close_metadata.key); | |
1610 | if (ret != 0) { | |
1611 | ret_code = ret; | |
1612 | } | |
1613 | ||
1614 | goto end_msg_sessiond; | |
1615 | } | |
7972aab2 DG |
1616 | case LTTNG_CONSUMER_FLUSH_CHANNEL: |
1617 | { | |
1618 | int ret; | |
1619 | ||
1620 | ret = flush_channel(msg.u.flush_channel.key); | |
1621 | if (ret != 0) { | |
1622 | ret_code = ret; | |
1623 | } | |
1624 | ||
1625 | goto end_msg_sessiond; | |
1626 | } | |
0dd01979 MD |
1627 | case LTTNG_CONSUMER_CLEAR_QUIESCENT_CHANNEL: |
1628 | { | |
1629 | int ret; | |
1630 | ||
1631 | ret = clear_quiescent_channel( | |
1632 | msg.u.clear_quiescent_channel.key); | |
1633 | if (ret != 0) { | |
1634 | ret_code = ret; | |
1635 | } | |
1636 | ||
1637 | goto end_msg_sessiond; | |
1638 | } | |
d88aee68 | 1639 | case LTTNG_CONSUMER_PUSH_METADATA: |
ffe60014 DG |
1640 | { |
1641 | int ret; | |
d88aee68 | 1642 | uint64_t len = msg.u.push_metadata.len; |
d88aee68 | 1643 | uint64_t key = msg.u.push_metadata.key; |
331744e3 | 1644 | uint64_t offset = msg.u.push_metadata.target_offset; |
93ec662e | 1645 | uint64_t version = msg.u.push_metadata.version; |
ffe60014 DG |
1646 | struct lttng_consumer_channel *channel; |
1647 | ||
8fd623e0 DG |
1648 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, |
1649 | len); | |
ffe60014 DG |
1650 | |
1651 | channel = consumer_find_channel(key); | |
1652 | if (!channel) { | |
000baf6a DG |
1653 | /* |
1654 | * This is possible if the metadata creation on the consumer side | |
1655 | * is in flight vis-a-vis a concurrent push metadata from the | |
1656 | * session daemon. Simply return that the channel failed and the | |
1657 | * session daemon will handle that message correctly considering | |
1658 | * that this race is acceptable thus the DBG() statement here. | |
1659 | */ | |
1660 | DBG("UST consumer push metadata %" PRIu64 " not found", key); | |
1661 | ret_code = LTTCOMM_CONSUMERD_CHANNEL_FAIL; | |
4a2eb0ca | 1662 | goto end_msg_sessiond; |
d88aee68 DG |
1663 | } |
1664 | ||
9ce5646a MD |
1665 | health_code_update(); |
1666 | ||
c585821b MD |
1667 | if (!len) { |
1668 | /* | |
1669 | * There is nothing to receive. We have simply | |
1670 | * checked whether the channel can be found. | |
1671 | */ | |
1672 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1673 | goto end_msg_sessiond; | |
1674 | } | |
1675 | ||
d88aee68 | 1676 | /* Tell session daemon we are ready to receive the metadata. */ |
0c759fc9 | 1677 | ret = consumer_send_status_msg(sock, LTTCOMM_CONSUMERD_SUCCESS); |
ffe60014 DG |
1678 | if (ret < 0) { |
1679 | /* Somehow, the session daemon is not responding anymore. */ | |
d88aee68 DG |
1680 | goto error_fatal; |
1681 | } | |
1682 | ||
9ce5646a MD |
1683 | health_code_update(); |
1684 | ||
d88aee68 | 1685 | /* Wait for more data. */ |
9ce5646a MD |
1686 | health_poll_entry(); |
1687 | ret = lttng_consumer_poll_socket(consumer_sockpoll); | |
1688 | health_poll_exit(); | |
84382d49 | 1689 | if (ret) { |
489f70e9 | 1690 | goto error_fatal; |
d88aee68 DG |
1691 | } |
1692 | ||
9ce5646a MD |
1693 | health_code_update(); |
1694 | ||
331744e3 | 1695 | ret = lttng_ustconsumer_recv_metadata(sock, key, offset, |
93ec662e | 1696 | len, version, channel, 0, 1); |
d88aee68 | 1697 | if (ret < 0) { |
331744e3 | 1698 | /* error receiving from sessiond */ |
489f70e9 | 1699 | goto error_fatal; |
331744e3 JD |
1700 | } else { |
1701 | ret_code = ret; | |
d88aee68 DG |
1702 | goto end_msg_sessiond; |
1703 | } | |
d88aee68 DG |
1704 | } |
1705 | case LTTNG_CONSUMER_SETUP_METADATA: | |
1706 | { | |
1707 | int ret; | |
1708 | ||
1709 | ret = setup_metadata(ctx, msg.u.setup_metadata.key); | |
1710 | if (ret) { | |
1711 | ret_code = ret; | |
1712 | } | |
1713 | goto end_msg_sessiond; | |
ffe60014 | 1714 | } |
6dc3064a DG |
1715 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
1716 | { | |
10a50311 JD |
1717 | if (msg.u.snapshot_channel.metadata) { |
1718 | ret = snapshot_metadata(msg.u.snapshot_channel.key, | |
1719 | msg.u.snapshot_channel.pathname, | |
1720 | msg.u.snapshot_channel.relayd_id, | |
1721 | ctx); | |
1722 | if (ret < 0) { | |
1723 | ERR("Snapshot metadata failed"); | |
e462382a | 1724 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; |
10a50311 JD |
1725 | } |
1726 | } else { | |
1727 | ret = snapshot_channel(msg.u.snapshot_channel.key, | |
1728 | msg.u.snapshot_channel.pathname, | |
1729 | msg.u.snapshot_channel.relayd_id, | |
d07ceecd | 1730 | msg.u.snapshot_channel.nb_packets_per_stream, |
10a50311 JD |
1731 | ctx); |
1732 | if (ret < 0) { | |
1733 | ERR("Snapshot channel failed"); | |
e462382a | 1734 | ret_code = LTTCOMM_CONSUMERD_CHANNEL_FAIL; |
10a50311 JD |
1735 | } |
1736 | } | |
1737 | ||
9ce5646a | 1738 | health_code_update(); |
6dc3064a DG |
1739 | ret = consumer_send_status_msg(sock, ret_code); |
1740 | if (ret < 0) { | |
1741 | /* Somehow, the session daemon is not responding anymore. */ | |
1742 | goto end_nosignal; | |
1743 | } | |
9ce5646a | 1744 | health_code_update(); |
6dc3064a DG |
1745 | break; |
1746 | } | |
fb83fe64 JD |
1747 | case LTTNG_CONSUMER_DISCARDED_EVENTS: |
1748 | { | |
beb59458 MJ |
1749 | int ret = 0; |
1750 | uint64_t discarded_events; | |
fb83fe64 JD |
1751 | struct lttng_ht_iter iter; |
1752 | struct lttng_ht *ht; | |
1753 | struct lttng_consumer_stream *stream; | |
1754 | uint64_t id = msg.u.discarded_events.session_id; | |
1755 | uint64_t key = msg.u.discarded_events.channel_key; | |
1756 | ||
1757 | DBG("UST consumer discarded events command for session id %" | |
1758 | PRIu64, id); | |
1759 | rcu_read_lock(); | |
1760 | pthread_mutex_lock(&consumer_data.lock); | |
1761 | ||
1762 | ht = consumer_data.stream_list_ht; | |
1763 | ||
1764 | /* | |
1765 | * We only need a reference to the channel, but they are not | |
1766 | * directly indexed, so we just use the first matching stream | |
1767 | * to extract the information we need, we default to 0 if not | |
1768 | * found (no events are dropped if the channel is not yet in | |
1769 | * use). | |
1770 | */ | |
beb59458 | 1771 | discarded_events = 0; |
fb83fe64 JD |
1772 | cds_lfht_for_each_entry_duplicate(ht->ht, |
1773 | ht->hash_fct(&id, lttng_ht_seed), | |
1774 | ht->match_fct, &id, | |
1775 | &iter.iter, stream, node_session_id.node) { | |
1776 | if (stream->chan->key == key) { | |
beb59458 | 1777 | discarded_events = stream->chan->discarded_events; |
fb83fe64 JD |
1778 | break; |
1779 | } | |
1780 | } | |
1781 | pthread_mutex_unlock(&consumer_data.lock); | |
1782 | rcu_read_unlock(); | |
1783 | ||
1784 | DBG("UST consumer discarded events command for session id %" | |
1785 | PRIu64 ", channel key %" PRIu64, id, key); | |
1786 | ||
1787 | health_code_update(); | |
1788 | ||
1789 | /* Send back returned value to session daemon */ | |
beb59458 | 1790 | ret = lttcomm_send_unix_sock(sock, &discarded_events, sizeof(discarded_events)); |
fb83fe64 JD |
1791 | if (ret < 0) { |
1792 | PERROR("send discarded events"); | |
1793 | goto error_fatal; | |
1794 | } | |
1795 | ||
1796 | break; | |
1797 | } | |
1798 | case LTTNG_CONSUMER_LOST_PACKETS: | |
1799 | { | |
9a06e8d4 JG |
1800 | int ret; |
1801 | uint64_t lost_packets; | |
fb83fe64 JD |
1802 | struct lttng_ht_iter iter; |
1803 | struct lttng_ht *ht; | |
1804 | struct lttng_consumer_stream *stream; | |
1805 | uint64_t id = msg.u.lost_packets.session_id; | |
1806 | uint64_t key = msg.u.lost_packets.channel_key; | |
1807 | ||
1808 | DBG("UST consumer lost packets command for session id %" | |
1809 | PRIu64, id); | |
1810 | rcu_read_lock(); | |
1811 | pthread_mutex_lock(&consumer_data.lock); | |
1812 | ||
1813 | ht = consumer_data.stream_list_ht; | |
1814 | ||
1815 | /* | |
1816 | * We only need a reference to the channel, but they are not | |
1817 | * directly indexed, so we just use the first matching stream | |
1818 | * to extract the information we need, we default to 0 if not | |
1819 | * found (no packets lost if the channel is not yet in use). | |
1820 | */ | |
9a06e8d4 | 1821 | lost_packets = 0; |
fb83fe64 JD |
1822 | cds_lfht_for_each_entry_duplicate(ht->ht, |
1823 | ht->hash_fct(&id, lttng_ht_seed), | |
1824 | ht->match_fct, &id, | |
1825 | &iter.iter, stream, node_session_id.node) { | |
1826 | if (stream->chan->key == key) { | |
9a06e8d4 | 1827 | lost_packets = stream->chan->lost_packets; |
fb83fe64 JD |
1828 | break; |
1829 | } | |
1830 | } | |
1831 | pthread_mutex_unlock(&consumer_data.lock); | |
1832 | rcu_read_unlock(); | |
1833 | ||
1834 | DBG("UST consumer lost packets command for session id %" | |
1835 | PRIu64 ", channel key %" PRIu64, id, key); | |
1836 | ||
1837 | health_code_update(); | |
1838 | ||
1839 | /* Send back returned value to session daemon */ | |
9a06e8d4 JG |
1840 | ret = lttcomm_send_unix_sock(sock, &lost_packets, |
1841 | sizeof(lost_packets)); | |
fb83fe64 JD |
1842 | if (ret < 0) { |
1843 | PERROR("send lost packets"); | |
1844 | goto error_fatal; | |
1845 | } | |
1846 | ||
1847 | break; | |
1848 | } | |
b3530820 JG |
1849 | case LTTNG_CONSUMER_SET_CHANNEL_MONITOR_PIPE: |
1850 | { | |
1851 | int channel_monitor_pipe; | |
1852 | ||
1853 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1854 | /* Successfully received the command's type. */ | |
1855 | ret = consumer_send_status_msg(sock, ret_code); | |
1856 | if (ret < 0) { | |
1857 | goto error_fatal; | |
1858 | } | |
1859 | ||
1860 | ret = lttcomm_recv_fds_unix_sock(sock, &channel_monitor_pipe, | |
1861 | 1); | |
1862 | if (ret != sizeof(channel_monitor_pipe)) { | |
1863 | ERR("Failed to receive channel monitor pipe"); | |
1864 | goto error_fatal; | |
1865 | } | |
1866 | ||
1867 | DBG("Received channel monitor pipe (%d)", channel_monitor_pipe); | |
1868 | ret = consumer_timer_thread_set_channel_monitor_pipe( | |
1869 | channel_monitor_pipe); | |
1870 | if (!ret) { | |
1871 | int flags; | |
1872 | ||
1873 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1874 | /* Set the pipe as non-blocking. */ | |
1875 | ret = fcntl(channel_monitor_pipe, F_GETFL, 0); | |
1876 | if (ret == -1) { | |
1877 | PERROR("fcntl get flags of the channel monitoring pipe"); | |
1878 | goto error_fatal; | |
1879 | } | |
1880 | flags = ret; | |
1881 | ||
1882 | ret = fcntl(channel_monitor_pipe, F_SETFL, | |
1883 | flags | O_NONBLOCK); | |
1884 | if (ret == -1) { | |
1885 | PERROR("fcntl set O_NONBLOCK flag of the channel monitoring pipe"); | |
1886 | goto error_fatal; | |
1887 | } | |
1888 | DBG("Channel monitor pipe set as non-blocking"); | |
1889 | } else { | |
1890 | ret_code = LTTCOMM_CONSUMERD_ALREADY_SET; | |
1891 | } | |
1892 | goto end_msg_sessiond; | |
1893 | } | |
3bd1e081 MD |
1894 | default: |
1895 | break; | |
1896 | } | |
3f8e211f | 1897 | |
3bd1e081 | 1898 | end_nosignal: |
b0b335c8 | 1899 | rcu_read_unlock(); |
4cbc1a04 | 1900 | |
9ce5646a MD |
1901 | health_code_update(); |
1902 | ||
4cbc1a04 DG |
1903 | /* |
1904 | * Return 1 to indicate success since the 0 value can be a socket | |
1905 | * shutdown during the recv() or send() call. | |
1906 | */ | |
1907 | return 1; | |
ffe60014 DG |
1908 | |
1909 | end_msg_sessiond: | |
1910 | /* | |
1911 | * The returned value here is not useful since either way we'll return 1 to | |
1912 | * the caller because the session daemon socket management is done | |
1913 | * elsewhere. Returning a negative code or 0 will shutdown the consumer. | |
1914 | */ | |
489f70e9 MD |
1915 | ret = consumer_send_status_msg(sock, ret_code); |
1916 | if (ret < 0) { | |
1917 | goto error_fatal; | |
1918 | } | |
ffe60014 | 1919 | rcu_read_unlock(); |
9ce5646a MD |
1920 | |
1921 | health_code_update(); | |
1922 | ||
ffe60014 DG |
1923 | return 1; |
1924 | end_channel_error: | |
1925 | if (channel) { | |
1926 | /* | |
1927 | * Free channel here since no one has a reference to it. We don't | |
1928 | * free after that because a stream can store this pointer. | |
1929 | */ | |
1930 | destroy_channel(channel); | |
1931 | } | |
1932 | /* We have to send a status channel message indicating an error. */ | |
1933 | ret = consumer_send_status_channel(sock, NULL); | |
1934 | if (ret < 0) { | |
1935 | /* Stop everything if session daemon can not be notified. */ | |
1936 | goto error_fatal; | |
1937 | } | |
1938 | rcu_read_unlock(); | |
9ce5646a MD |
1939 | |
1940 | health_code_update(); | |
1941 | ||
ffe60014 DG |
1942 | return 1; |
1943 | error_fatal: | |
1944 | rcu_read_unlock(); | |
1945 | /* This will issue a consumer stop. */ | |
1946 | return -1; | |
3bd1e081 MD |
1947 | } |
1948 | ||
ffe60014 DG |
1949 | /* |
1950 | * Wrapper over the mmap() read offset from ust-ctl library. Since this can be | |
1951 | * compiled out, we isolate it in this library. | |
1952 | */ | |
1953 | int lttng_ustctl_get_mmap_read_offset(struct lttng_consumer_stream *stream, | |
1954 | unsigned long *off) | |
3bd1e081 | 1955 | { |
ffe60014 DG |
1956 | assert(stream); |
1957 | assert(stream->ustream); | |
b5c5fc29 | 1958 | |
ffe60014 | 1959 | return ustctl_get_mmap_read_offset(stream->ustream, off); |
3bd1e081 MD |
1960 | } |
1961 | ||
ffe60014 DG |
1962 | /* |
1963 | * Wrapper over the mmap() read offset from ust-ctl library. Since this can be | |
1964 | * compiled out, we isolate it in this library. | |
1965 | */ | |
1966 | void *lttng_ustctl_get_mmap_base(struct lttng_consumer_stream *stream) | |
d056b477 | 1967 | { |
ffe60014 DG |
1968 | assert(stream); |
1969 | assert(stream->ustream); | |
1970 | ||
1971 | return ustctl_get_mmap_base(stream->ustream); | |
d056b477 MD |
1972 | } |
1973 | ||
ffe60014 | 1974 | /* |
e9404c27 | 1975 | * Take a snapshot for a specific stream. |
ffe60014 DG |
1976 | * |
1977 | * Returns 0 on success, < 0 on error | |
1978 | */ | |
1979 | int lttng_ustconsumer_take_snapshot(struct lttng_consumer_stream *stream) | |
3bd1e081 | 1980 | { |
ffe60014 DG |
1981 | assert(stream); |
1982 | assert(stream->ustream); | |
1983 | ||
1984 | return ustctl_snapshot(stream->ustream); | |
3bd1e081 MD |
1985 | } |
1986 | ||
e9404c27 JG |
1987 | /* |
1988 | * Sample consumed and produced positions for a specific stream. | |
1989 | * | |
1990 | * Returns 0 on success, < 0 on error. | |
1991 | */ | |
1992 | int lttng_ustconsumer_sample_snapshot_positions( | |
1993 | struct lttng_consumer_stream *stream) | |
1994 | { | |
1995 | assert(stream); | |
1996 | assert(stream->ustream); | |
1997 | ||
1998 | return ustctl_snapshot_sample_positions(stream->ustream); | |
1999 | } | |
2000 | ||
ffe60014 DG |
2001 | /* |
2002 | * Get the produced position | |
2003 | * | |
2004 | * Returns 0 on success, < 0 on error | |
2005 | */ | |
2006 | int lttng_ustconsumer_get_produced_snapshot( | |
2007 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
3bd1e081 | 2008 | { |
ffe60014 DG |
2009 | assert(stream); |
2010 | assert(stream->ustream); | |
2011 | assert(pos); | |
7a57cf92 | 2012 | |
ffe60014 DG |
2013 | return ustctl_snapshot_get_produced(stream->ustream, pos); |
2014 | } | |
7a57cf92 | 2015 | |
10a50311 JD |
2016 | /* |
2017 | * Get the consumed position | |
2018 | * | |
2019 | * Returns 0 on success, < 0 on error | |
2020 | */ | |
2021 | int lttng_ustconsumer_get_consumed_snapshot( | |
2022 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
2023 | { | |
2024 | assert(stream); | |
2025 | assert(stream->ustream); | |
2026 | assert(pos); | |
2027 | ||
2028 | return ustctl_snapshot_get_consumed(stream->ustream, pos); | |
2029 | } | |
2030 | ||
84a182ce DG |
2031 | void lttng_ustconsumer_flush_buffer(struct lttng_consumer_stream *stream, |
2032 | int producer) | |
2033 | { | |
2034 | assert(stream); | |
2035 | assert(stream->ustream); | |
2036 | ||
2037 | ustctl_flush_buffer(stream->ustream, producer); | |
2038 | } | |
2039 | ||
2040 | int lttng_ustconsumer_get_current_timestamp( | |
2041 | struct lttng_consumer_stream *stream, uint64_t *ts) | |
2042 | { | |
2043 | assert(stream); | |
2044 | assert(stream->ustream); | |
2045 | assert(ts); | |
2046 | ||
2047 | return ustctl_get_current_timestamp(stream->ustream, ts); | |
2048 | } | |
2049 | ||
fb83fe64 JD |
2050 | int lttng_ustconsumer_get_sequence_number( |
2051 | struct lttng_consumer_stream *stream, uint64_t *seq) | |
2052 | { | |
2053 | assert(stream); | |
2054 | assert(stream->ustream); | |
2055 | assert(seq); | |
2056 | ||
2057 | return ustctl_get_sequence_number(stream->ustream, seq); | |
2058 | } | |
2059 | ||
ffe60014 | 2060 | /* |
0dd01979 | 2061 | * Called when the stream signals the consumer that it has hung up. |
ffe60014 DG |
2062 | */ |
2063 | void lttng_ustconsumer_on_stream_hangup(struct lttng_consumer_stream *stream) | |
2064 | { | |
2065 | assert(stream); | |
2066 | assert(stream->ustream); | |
2c1dd183 | 2067 | |
0dd01979 MD |
2068 | pthread_mutex_lock(&stream->lock); |
2069 | if (!stream->quiescent) { | |
2070 | ustctl_flush_buffer(stream->ustream, 0); | |
2071 | stream->quiescent = true; | |
2072 | } | |
2073 | pthread_mutex_unlock(&stream->lock); | |
ffe60014 DG |
2074 | stream->hangup_flush_done = 1; |
2075 | } | |
ee77a7b0 | 2076 | |
ffe60014 DG |
2077 | void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan) |
2078 | { | |
4628484a MD |
2079 | int i; |
2080 | ||
ffe60014 DG |
2081 | assert(chan); |
2082 | assert(chan->uchan); | |
e316aad5 | 2083 | |
ea88ca2a MD |
2084 | if (chan->switch_timer_enabled == 1) { |
2085 | consumer_timer_switch_stop(chan); | |
2086 | } | |
4628484a MD |
2087 | for (i = 0; i < chan->nr_stream_fds; i++) { |
2088 | int ret; | |
2089 | ||
2090 | ret = close(chan->stream_fds[i]); | |
2091 | if (ret) { | |
2092 | PERROR("close"); | |
2093 | } | |
2094 | if (chan->shm_path[0]) { | |
2095 | char shm_path[PATH_MAX]; | |
2096 | ||
2097 | ret = get_stream_shm_path(shm_path, chan->shm_path, i); | |
2098 | if (ret) { | |
2099 | ERR("Cannot get stream shm path"); | |
2100 | } | |
2101 | ret = run_as_unlink(shm_path, chan->uid, chan->gid); | |
2102 | if (ret) { | |
4628484a MD |
2103 | PERROR("unlink %s", shm_path); |
2104 | } | |
2105 | } | |
2106 | } | |
3bd1e081 MD |
2107 | } |
2108 | ||
b83e03c4 MD |
2109 | void lttng_ustconsumer_free_channel(struct lttng_consumer_channel *chan) |
2110 | { | |
2111 | assert(chan); | |
2112 | assert(chan->uchan); | |
2113 | ||
2114 | consumer_metadata_cache_destroy(chan); | |
2115 | ustctl_destroy_channel(chan->uchan); | |
ea853771 JR |
2116 | /* Try to rmdir all directories under shm_path root. */ |
2117 | if (chan->root_shm_path[0]) { | |
602766ec | 2118 | (void) run_as_rmdir_recursive(chan->root_shm_path, |
ea853771 JR |
2119 | chan->uid, chan->gid); |
2120 | } | |
b83e03c4 MD |
2121 | free(chan->stream_fds); |
2122 | } | |
2123 | ||
3bd1e081 MD |
2124 | void lttng_ustconsumer_del_stream(struct lttng_consumer_stream *stream) |
2125 | { | |
ffe60014 DG |
2126 | assert(stream); |
2127 | assert(stream->ustream); | |
d41f73b7 | 2128 | |
ea88ca2a MD |
2129 | if (stream->chan->switch_timer_enabled == 1) { |
2130 | consumer_timer_switch_stop(stream->chan); | |
2131 | } | |
ffe60014 DG |
2132 | ustctl_destroy_stream(stream->ustream); |
2133 | } | |
d41f73b7 | 2134 | |
6d574024 DG |
2135 | int lttng_ustconsumer_get_wakeup_fd(struct lttng_consumer_stream *stream) |
2136 | { | |
2137 | assert(stream); | |
2138 | assert(stream->ustream); | |
2139 | ||
2140 | return ustctl_stream_get_wakeup_fd(stream->ustream); | |
2141 | } | |
2142 | ||
2143 | int lttng_ustconsumer_close_wakeup_fd(struct lttng_consumer_stream *stream) | |
2144 | { | |
2145 | assert(stream); | |
2146 | assert(stream->ustream); | |
2147 | ||
2148 | return ustctl_stream_close_wakeup_fd(stream->ustream); | |
2149 | } | |
2150 | ||
309167d2 JD |
2151 | /* |
2152 | * Populate index values of a UST stream. Values are set in big endian order. | |
2153 | * | |
2154 | * Return 0 on success or else a negative value. | |
2155 | */ | |
50adc264 | 2156 | static int get_index_values(struct ctf_packet_index *index, |
309167d2 JD |
2157 | struct ustctl_consumer_stream *ustream) |
2158 | { | |
2159 | int ret; | |
2160 | ||
2161 | ret = ustctl_get_timestamp_begin(ustream, &index->timestamp_begin); | |
2162 | if (ret < 0) { | |
2163 | PERROR("ustctl_get_timestamp_begin"); | |
2164 | goto error; | |
2165 | } | |
2166 | index->timestamp_begin = htobe64(index->timestamp_begin); | |
2167 | ||
2168 | ret = ustctl_get_timestamp_end(ustream, &index->timestamp_end); | |
2169 | if (ret < 0) { | |
2170 | PERROR("ustctl_get_timestamp_end"); | |
2171 | goto error; | |
2172 | } | |
2173 | index->timestamp_end = htobe64(index->timestamp_end); | |
2174 | ||
2175 | ret = ustctl_get_events_discarded(ustream, &index->events_discarded); | |
2176 | if (ret < 0) { | |
2177 | PERROR("ustctl_get_events_discarded"); | |
2178 | goto error; | |
2179 | } | |
2180 | index->events_discarded = htobe64(index->events_discarded); | |
2181 | ||
2182 | ret = ustctl_get_content_size(ustream, &index->content_size); | |
2183 | if (ret < 0) { | |
2184 | PERROR("ustctl_get_content_size"); | |
2185 | goto error; | |
2186 | } | |
2187 | index->content_size = htobe64(index->content_size); | |
2188 | ||
2189 | ret = ustctl_get_packet_size(ustream, &index->packet_size); | |
2190 | if (ret < 0) { | |
2191 | PERROR("ustctl_get_packet_size"); | |
2192 | goto error; | |
2193 | } | |
2194 | index->packet_size = htobe64(index->packet_size); | |
2195 | ||
2196 | ret = ustctl_get_stream_id(ustream, &index->stream_id); | |
2197 | if (ret < 0) { | |
2198 | PERROR("ustctl_get_stream_id"); | |
2199 | goto error; | |
2200 | } | |
2201 | index->stream_id = htobe64(index->stream_id); | |
2202 | ||
234cd636 JD |
2203 | ret = ustctl_get_instance_id(ustream, &index->stream_instance_id); |
2204 | if (ret < 0) { | |
2205 | PERROR("ustctl_get_instance_id"); | |
2206 | goto error; | |
2207 | } | |
2208 | index->stream_instance_id = htobe64(index->stream_instance_id); | |
2209 | ||
2210 | ret = ustctl_get_sequence_number(ustream, &index->packet_seq_num); | |
2211 | if (ret < 0) { | |
2212 | PERROR("ustctl_get_sequence_number"); | |
2213 | goto error; | |
2214 | } | |
2215 | index->packet_seq_num = htobe64(index->packet_seq_num); | |
2216 | ||
309167d2 JD |
2217 | error: |
2218 | return ret; | |
2219 | } | |
2220 | ||
93ec662e JD |
2221 | static |
2222 | void metadata_stream_reset_cache(struct lttng_consumer_stream *stream, | |
2223 | struct consumer_metadata_cache *cache) | |
2224 | { | |
2225 | DBG("Metadata stream update to version %" PRIu64, | |
2226 | cache->version); | |
2227 | stream->ust_metadata_pushed = 0; | |
2228 | stream->metadata_version = cache->version; | |
2229 | stream->reset_metadata_flag = 1; | |
2230 | } | |
2231 | ||
2232 | /* | |
2233 | * Check if the version of the metadata stream and metadata cache match. | |
2234 | * If the cache got updated, reset the metadata stream. | |
2235 | * The stream lock and metadata cache lock MUST be held. | |
2236 | * Return 0 on success, a negative value on error. | |
2237 | */ | |
2238 | static | |
2239 | int metadata_stream_check_version(struct lttng_consumer_stream *stream) | |
2240 | { | |
2241 | int ret = 0; | |
2242 | struct consumer_metadata_cache *cache = stream->chan->metadata_cache; | |
2243 | ||
2244 | if (cache->version == stream->metadata_version) { | |
2245 | goto end; | |
2246 | } | |
2247 | metadata_stream_reset_cache(stream, cache); | |
2248 | ||
2249 | end: | |
2250 | return ret; | |
2251 | } | |
2252 | ||
94d49140 JD |
2253 | /* |
2254 | * Write up to one packet from the metadata cache to the channel. | |
2255 | * | |
2256 | * Returns the number of bytes pushed in the cache, or a negative value | |
2257 | * on error. | |
2258 | */ | |
2259 | static | |
2260 | int commit_one_metadata_packet(struct lttng_consumer_stream *stream) | |
2261 | { | |
2262 | ssize_t write_len; | |
2263 | int ret; | |
2264 | ||
2265 | pthread_mutex_lock(&stream->chan->metadata_cache->lock); | |
93ec662e JD |
2266 | ret = metadata_stream_check_version(stream); |
2267 | if (ret < 0) { | |
2268 | goto end; | |
2269 | } | |
c585821b | 2270 | if (stream->chan->metadata_cache->max_offset |
94d49140 JD |
2271 | == stream->ust_metadata_pushed) { |
2272 | ret = 0; | |
2273 | goto end; | |
2274 | } | |
2275 | ||
2276 | write_len = ustctl_write_one_packet_to_channel(stream->chan->uchan, | |
2277 | &stream->chan->metadata_cache->data[stream->ust_metadata_pushed], | |
c585821b | 2278 | stream->chan->metadata_cache->max_offset |
94d49140 JD |
2279 | - stream->ust_metadata_pushed); |
2280 | assert(write_len != 0); | |
2281 | if (write_len < 0) { | |
2282 | ERR("Writing one metadata packet"); | |
2283 | ret = -1; | |
2284 | goto end; | |
2285 | } | |
2286 | stream->ust_metadata_pushed += write_len; | |
2287 | ||
c585821b | 2288 | assert(stream->chan->metadata_cache->max_offset >= |
94d49140 JD |
2289 | stream->ust_metadata_pushed); |
2290 | ret = write_len; | |
2291 | ||
2292 | end: | |
2293 | pthread_mutex_unlock(&stream->chan->metadata_cache->lock); | |
2294 | return ret; | |
2295 | } | |
2296 | ||
309167d2 | 2297 | |
94d49140 JD |
2298 | /* |
2299 | * Sync metadata meaning request them to the session daemon and snapshot to the | |
2300 | * metadata thread can consumer them. | |
2301 | * | |
c585821b MD |
2302 | * Metadata stream lock is held here, but we need to release it when |
2303 | * interacting with sessiond, else we cause a deadlock with live | |
2304 | * awaiting on metadata to be pushed out. | |
94d49140 JD |
2305 | * |
2306 | * Return 0 if new metadatda is available, EAGAIN if the metadata stream | |
2307 | * is empty or a negative value on error. | |
2308 | */ | |
2309 | int lttng_ustconsumer_sync_metadata(struct lttng_consumer_local_data *ctx, | |
2310 | struct lttng_consumer_stream *metadata) | |
2311 | { | |
2312 | int ret; | |
2313 | int retry = 0; | |
2314 | ||
2315 | assert(ctx); | |
2316 | assert(metadata); | |
2317 | ||
c585821b | 2318 | pthread_mutex_unlock(&metadata->lock); |
94d49140 JD |
2319 | /* |
2320 | * Request metadata from the sessiond, but don't wait for the flush | |
2321 | * because we locked the metadata thread. | |
2322 | */ | |
2323 | ret = lttng_ustconsumer_request_metadata(ctx, metadata->chan, 0, 0); | |
1caeb2eb | 2324 | pthread_mutex_lock(&metadata->lock); |
94d49140 JD |
2325 | if (ret < 0) { |
2326 | goto end; | |
2327 | } | |
2328 | ||
2329 | ret = commit_one_metadata_packet(metadata); | |
2330 | if (ret <= 0) { | |
2331 | goto end; | |
2332 | } else if (ret > 0) { | |
2333 | retry = 1; | |
2334 | } | |
2335 | ||
2336 | ustctl_flush_buffer(metadata->ustream, 1); | |
2337 | ret = ustctl_snapshot(metadata->ustream); | |
2338 | if (ret < 0) { | |
2339 | if (errno != EAGAIN) { | |
2340 | ERR("Sync metadata, taking UST snapshot"); | |
2341 | goto end; | |
2342 | } | |
2343 | DBG("No new metadata when syncing them."); | |
2344 | /* No new metadata, exit. */ | |
2345 | ret = ENODATA; | |
2346 | goto end; | |
2347 | } | |
2348 | ||
2349 | /* | |
2350 | * After this flush, we still need to extract metadata. | |
2351 | */ | |
2352 | if (retry) { | |
2353 | ret = EAGAIN; | |
2354 | } | |
2355 | ||
2356 | end: | |
2357 | return ret; | |
2358 | } | |
2359 | ||
02b3d176 DG |
2360 | /* |
2361 | * Return 0 on success else a negative value. | |
2362 | */ | |
2363 | static int notify_if_more_data(struct lttng_consumer_stream *stream, | |
2364 | struct lttng_consumer_local_data *ctx) | |
2365 | { | |
2366 | int ret; | |
2367 | struct ustctl_consumer_stream *ustream; | |
2368 | ||
2369 | assert(stream); | |
2370 | assert(ctx); | |
2371 | ||
2372 | ustream = stream->ustream; | |
2373 | ||
2374 | /* | |
2375 | * First, we are going to check if there is a new subbuffer available | |
2376 | * before reading the stream wait_fd. | |
2377 | */ | |
2378 | /* Get the next subbuffer */ | |
2379 | ret = ustctl_get_next_subbuf(ustream); | |
2380 | if (ret) { | |
2381 | /* No more data found, flag the stream. */ | |
2382 | stream->has_data = 0; | |
2383 | ret = 0; | |
2384 | goto end; | |
2385 | } | |
2386 | ||
5420e5db | 2387 | ret = ustctl_put_subbuf(ustream); |
02b3d176 DG |
2388 | assert(!ret); |
2389 | ||
2390 | /* This stream still has data. Flag it and wake up the data thread. */ | |
2391 | stream->has_data = 1; | |
2392 | ||
2393 | if (stream->monitor && !stream->hangup_flush_done && !ctx->has_wakeup) { | |
2394 | ssize_t writelen; | |
2395 | ||
2396 | writelen = lttng_pipe_write(ctx->consumer_wakeup_pipe, "!", 1); | |
2397 | if (writelen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) { | |
2398 | ret = writelen; | |
2399 | goto end; | |
2400 | } | |
2401 | ||
2402 | /* The wake up pipe has been notified. */ | |
2403 | ctx->has_wakeup = 1; | |
2404 | } | |
2405 | ret = 0; | |
2406 | ||
2407 | end: | |
2408 | return ret; | |
2409 | } | |
2410 | ||
fb83fe64 JD |
2411 | static |
2412 | int update_stream_stats(struct lttng_consumer_stream *stream) | |
2413 | { | |
2414 | int ret; | |
2415 | uint64_t seq, discarded; | |
2416 | ||
2417 | ret = ustctl_get_sequence_number(stream->ustream, &seq); | |
2418 | if (ret < 0) { | |
2419 | PERROR("ustctl_get_sequence_number"); | |
2420 | goto end; | |
2421 | } | |
2422 | /* | |
2423 | * Start the sequence when we extract the first packet in case we don't | |
2424 | * start at 0 (for example if a consumer is not connected to the | |
2425 | * session immediately after the beginning). | |
2426 | */ | |
2427 | if (stream->last_sequence_number == -1ULL) { | |
2428 | stream->last_sequence_number = seq; | |
2429 | } else if (seq > stream->last_sequence_number) { | |
2430 | stream->chan->lost_packets += seq - | |
2431 | stream->last_sequence_number - 1; | |
2432 | } else { | |
2433 | /* seq <= last_sequence_number */ | |
2434 | ERR("Sequence number inconsistent : prev = %" PRIu64 | |
2435 | ", current = %" PRIu64, | |
2436 | stream->last_sequence_number, seq); | |
2437 | ret = -1; | |
2438 | goto end; | |
2439 | } | |
2440 | stream->last_sequence_number = seq; | |
2441 | ||
2442 | ret = ustctl_get_events_discarded(stream->ustream, &discarded); | |
2443 | if (ret < 0) { | |
2444 | PERROR("kernctl_get_events_discarded"); | |
2445 | goto end; | |
2446 | } | |
2447 | if (discarded < stream->last_discarded_events) { | |
2448 | /* | |
83f4233d MJ |
2449 | * Overflow has occurred. We assume only one wrap-around |
2450 | * has occurred. | |
fb83fe64 JD |
2451 | */ |
2452 | stream->chan->discarded_events += | |
2453 | (1ULL << (CAA_BITS_PER_LONG - 1)) - | |
2454 | stream->last_discarded_events + discarded; | |
2455 | } else { | |
2456 | stream->chan->discarded_events += discarded - | |
2457 | stream->last_discarded_events; | |
2458 | } | |
2459 | stream->last_discarded_events = discarded; | |
2460 | ret = 0; | |
2461 | ||
2462 | end: | |
2463 | return ret; | |
2464 | } | |
2465 | ||
94d49140 JD |
2466 | /* |
2467 | * Read subbuffer from the given stream. | |
2468 | * | |
2469 | * Stream lock MUST be acquired. | |
2470 | * | |
2471 | * Return 0 on success else a negative value. | |
2472 | */ | |
d41f73b7 MD |
2473 | int lttng_ustconsumer_read_subbuffer(struct lttng_consumer_stream *stream, |
2474 | struct lttng_consumer_local_data *ctx) | |
2475 | { | |
1d4dfdef | 2476 | unsigned long len, subbuf_size, padding; |
1c20f0e2 | 2477 | int err, write_index = 1; |
d41f73b7 | 2478 | long ret = 0; |
ffe60014 | 2479 | struct ustctl_consumer_stream *ustream; |
50adc264 | 2480 | struct ctf_packet_index index; |
ffe60014 DG |
2481 | |
2482 | assert(stream); | |
2483 | assert(stream->ustream); | |
2484 | assert(ctx); | |
d41f73b7 | 2485 | |
3eb914c0 | 2486 | DBG("In UST read_subbuffer (wait_fd: %d, name: %s)", stream->wait_fd, |
ffe60014 DG |
2487 | stream->name); |
2488 | ||
2489 | /* Ease our life for what's next. */ | |
2490 | ustream = stream->ustream; | |
d41f73b7 | 2491 | |
6cd525e8 | 2492 | /* |
02b3d176 DG |
2493 | * We can consume the 1 byte written into the wait_fd by UST. Don't trigger |
2494 | * error if we cannot read this one byte (read returns 0), or if the error | |
2495 | * is EAGAIN or EWOULDBLOCK. | |
2496 | * | |
2497 | * This is only done when the stream is monitored by a thread, before the | |
2498 | * flush is done after a hangup and if the stream is not flagged with data | |
2499 | * since there might be nothing to consume in the wait fd but still have | |
2500 | * data available flagged by the consumer wake up pipe. | |
6cd525e8 | 2501 | */ |
02b3d176 DG |
2502 | if (stream->monitor && !stream->hangup_flush_done && !stream->has_data) { |
2503 | char dummy; | |
c617c0c6 MD |
2504 | ssize_t readlen; |
2505 | ||
6cd525e8 MD |
2506 | readlen = lttng_read(stream->wait_fd, &dummy, 1); |
2507 | if (readlen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) { | |
effcf122 MD |
2508 | ret = readlen; |
2509 | goto end; | |
2510 | } | |
d41f73b7 MD |
2511 | } |
2512 | ||
04ef1097 | 2513 | retry: |
d41f73b7 | 2514 | /* Get the next subbuffer */ |
ffe60014 | 2515 | err = ustctl_get_next_subbuf(ustream); |
d41f73b7 | 2516 | if (err != 0) { |
04ef1097 MD |
2517 | /* |
2518 | * Populate metadata info if the existing info has | |
2519 | * already been read. | |
2520 | */ | |
2521 | if (stream->metadata_flag) { | |
94d49140 JD |
2522 | ret = commit_one_metadata_packet(stream); |
2523 | if (ret <= 0) { | |
04ef1097 MD |
2524 | goto end; |
2525 | } | |
04ef1097 MD |
2526 | ustctl_flush_buffer(stream->ustream, 1); |
2527 | goto retry; | |
2528 | } | |
2529 | ||
1d4dfdef | 2530 | ret = err; /* ustctl_get_next_subbuf returns negative, caller expect positive. */ |
d41f73b7 MD |
2531 | /* |
2532 | * This is a debug message even for single-threaded consumer, | |
2533 | * because poll() have more relaxed criterions than get subbuf, | |
2534 | * so get_subbuf may fail for short race windows where poll() | |
2535 | * would issue wakeups. | |
2536 | */ | |
2537 | DBG("Reserving sub buffer failed (everything is normal, " | |
ffe60014 | 2538 | "it is due to concurrency) [ret: %d]", err); |
d41f73b7 MD |
2539 | goto end; |
2540 | } | |
ffe60014 | 2541 | assert(stream->chan->output == CONSUMER_CHANNEL_MMAP); |
309167d2 | 2542 | |
1c20f0e2 | 2543 | if (!stream->metadata_flag) { |
309167d2 JD |
2544 | index.offset = htobe64(stream->out_fd_offset); |
2545 | ret = get_index_values(&index, ustream); | |
2546 | if (ret < 0) { | |
7b87473d MD |
2547 | err = ustctl_put_subbuf(ustream); |
2548 | assert(err == 0); | |
309167d2 JD |
2549 | goto end; |
2550 | } | |
fb83fe64 JD |
2551 | |
2552 | /* Update the stream's sequence and discarded events count. */ | |
2553 | ret = update_stream_stats(stream); | |
2554 | if (ret < 0) { | |
2555 | PERROR("kernctl_get_events_discarded"); | |
7b87473d MD |
2556 | err = ustctl_put_subbuf(ustream); |
2557 | assert(err == 0); | |
fb83fe64 JD |
2558 | goto end; |
2559 | } | |
1c20f0e2 JD |
2560 | } else { |
2561 | write_index = 0; | |
309167d2 JD |
2562 | } |
2563 | ||
1d4dfdef | 2564 | /* Get the full padded subbuffer size */ |
ffe60014 | 2565 | err = ustctl_get_padded_subbuf_size(ustream, &len); |
effcf122 | 2566 | assert(err == 0); |
1d4dfdef DG |
2567 | |
2568 | /* Get subbuffer data size (without padding) */ | |
ffe60014 | 2569 | err = ustctl_get_subbuf_size(ustream, &subbuf_size); |
1d4dfdef DG |
2570 | assert(err == 0); |
2571 | ||
2572 | /* Make sure we don't get a subbuffer size bigger than the padded */ | |
2573 | assert(len >= subbuf_size); | |
2574 | ||
2575 | padding = len - subbuf_size; | |
d41f73b7 | 2576 | /* write the subbuffer to the tracefile */ |
309167d2 | 2577 | ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, padding, &index); |
91dfef6e DG |
2578 | /* |
2579 | * The mmap operation should write subbuf_size amount of data when network | |
2580 | * streaming or the full padding (len) size when we are _not_ streaming. | |
2581 | */ | |
d88aee68 DG |
2582 | if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) || |
2583 | (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) { | |
d41f73b7 | 2584 | /* |
91dfef6e | 2585 | * Display the error but continue processing to try to release the |
c5c45efa DG |
2586 | * subbuffer. This is a DBG statement since any unexpected kill or |
2587 | * signal, the application gets unregistered, relayd gets closed or | |
2588 | * anything that affects the buffer lifetime will trigger this error. | |
2589 | * So, for the sake of the user, don't print this error since it can | |
2590 | * happen and it is OK with the code flow. | |
d41f73b7 | 2591 | */ |
c5c45efa | 2592 | DBG("Error writing to tracefile " |
8fd623e0 | 2593 | "(ret: %ld != len: %lu != subbuf_size: %lu)", |
91dfef6e | 2594 | ret, len, subbuf_size); |
309167d2 | 2595 | write_index = 0; |
d41f73b7 | 2596 | } |
ffe60014 | 2597 | err = ustctl_put_next_subbuf(ustream); |
effcf122 | 2598 | assert(err == 0); |
331744e3 | 2599 | |
02b3d176 DG |
2600 | /* |
2601 | * This will consumer the byte on the wait_fd if and only if there is not | |
2602 | * next subbuffer to be acquired. | |
2603 | */ | |
2604 | if (!stream->metadata_flag) { | |
2605 | ret = notify_if_more_data(stream, ctx); | |
2606 | if (ret < 0) { | |
2607 | goto end; | |
2608 | } | |
2609 | } | |
2610 | ||
309167d2 | 2611 | /* Write index if needed. */ |
1c20f0e2 JD |
2612 | if (!write_index) { |
2613 | goto end; | |
2614 | } | |
2615 | ||
94d49140 JD |
2616 | if (stream->chan->live_timer_interval && !stream->metadata_flag) { |
2617 | /* | |
2618 | * In live, block until all the metadata is sent. | |
2619 | */ | |
c585821b MD |
2620 | pthread_mutex_lock(&stream->metadata_timer_lock); |
2621 | assert(!stream->missed_metadata_flush); | |
2622 | stream->waiting_on_metadata = true; | |
2623 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
2624 | ||
94d49140 | 2625 | err = consumer_stream_sync_metadata(ctx, stream->session_id); |
c585821b MD |
2626 | |
2627 | pthread_mutex_lock(&stream->metadata_timer_lock); | |
2628 | stream->waiting_on_metadata = false; | |
2629 | if (stream->missed_metadata_flush) { | |
2630 | stream->missed_metadata_flush = false; | |
2631 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
2632 | (void) consumer_flush_ust_index(stream); | |
2633 | } else { | |
2634 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
2635 | } | |
2636 | ||
94d49140 JD |
2637 | if (err < 0) { |
2638 | goto end; | |
2639 | } | |
2640 | } | |
2641 | ||
1c20f0e2 JD |
2642 | assert(!stream->metadata_flag); |
2643 | err = consumer_stream_write_index(stream, &index); | |
2644 | if (err < 0) { | |
2645 | goto end; | |
309167d2 JD |
2646 | } |
2647 | ||
d41f73b7 MD |
2648 | end: |
2649 | return ret; | |
2650 | } | |
2651 | ||
ffe60014 DG |
2652 | /* |
2653 | * Called when a stream is created. | |
fe4477ee JD |
2654 | * |
2655 | * Return 0 on success or else a negative value. | |
ffe60014 | 2656 | */ |
d41f73b7 MD |
2657 | int lttng_ustconsumer_on_recv_stream(struct lttng_consumer_stream *stream) |
2658 | { | |
fe4477ee JD |
2659 | int ret; |
2660 | ||
10a50311 JD |
2661 | assert(stream); |
2662 | ||
fe4477ee | 2663 | /* Don't create anything if this is set for streaming. */ |
10a50311 | 2664 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor) { |
fe4477ee JD |
2665 | ret = utils_create_stream_file(stream->chan->pathname, stream->name, |
2666 | stream->chan->tracefile_size, stream->tracefile_count_current, | |
309167d2 | 2667 | stream->uid, stream->gid, NULL); |
fe4477ee JD |
2668 | if (ret < 0) { |
2669 | goto error; | |
2670 | } | |
2671 | stream->out_fd = ret; | |
2672 | stream->tracefile_size_current = 0; | |
309167d2 JD |
2673 | |
2674 | if (!stream->metadata_flag) { | |
f8f3885c MD |
2675 | struct lttng_index_file *index_file; |
2676 | ||
2677 | index_file = lttng_index_file_create(stream->chan->pathname, | |
309167d2 JD |
2678 | stream->name, stream->uid, stream->gid, |
2679 | stream->chan->tracefile_size, | |
f8f3885c MD |
2680 | stream->tracefile_count_current, |
2681 | CTF_INDEX_MAJOR, CTF_INDEX_MINOR); | |
2682 | if (!index_file) { | |
309167d2 JD |
2683 | goto error; |
2684 | } | |
1b47ae58 | 2685 | assert(!stream->index_file); |
f8f3885c | 2686 | stream->index_file = index_file; |
309167d2 | 2687 | } |
fe4477ee JD |
2688 | } |
2689 | ret = 0; | |
2690 | ||
2691 | error: | |
2692 | return ret; | |
d41f73b7 | 2693 | } |
ca22feea DG |
2694 | |
2695 | /* | |
2696 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
2697 | * stream. Consumer data lock MUST be acquired before calling this function |
2698 | * and the stream lock. | |
ca22feea | 2699 | * |
6d805429 | 2700 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
2701 | * data is available for trace viewer reading. |
2702 | */ | |
6d805429 | 2703 | int lttng_ustconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
2704 | { |
2705 | int ret; | |
2706 | ||
2707 | assert(stream); | |
ffe60014 | 2708 | assert(stream->ustream); |
ca22feea | 2709 | |
6d805429 | 2710 | DBG("UST consumer checking data pending"); |
c8f59ee5 | 2711 | |
ca6b395f MD |
2712 | if (stream->endpoint_status != CONSUMER_ENDPOINT_ACTIVE) { |
2713 | ret = 0; | |
2714 | goto end; | |
2715 | } | |
2716 | ||
04ef1097 | 2717 | if (stream->chan->type == CONSUMER_CHANNEL_TYPE_METADATA) { |
e6ee4eab DG |
2718 | uint64_t contiguous, pushed; |
2719 | ||
2720 | /* Ease our life a bit. */ | |
c585821b | 2721 | contiguous = stream->chan->metadata_cache->max_offset; |
e6ee4eab DG |
2722 | pushed = stream->ust_metadata_pushed; |
2723 | ||
04ef1097 MD |
2724 | /* |
2725 | * We can simply check whether all contiguously available data | |
2726 | * has been pushed to the ring buffer, since the push operation | |
2727 | * is performed within get_next_subbuf(), and because both | |
2728 | * get_next_subbuf() and put_next_subbuf() are issued atomically | |
2729 | * thanks to the stream lock within | |
2730 | * lttng_ustconsumer_read_subbuffer(). This basically means that | |
2731 | * whetnever ust_metadata_pushed is incremented, the associated | |
2732 | * metadata has been consumed from the metadata stream. | |
2733 | */ | |
2734 | DBG("UST consumer metadata pending check: contiguous %" PRIu64 " vs pushed %" PRIu64, | |
e6ee4eab | 2735 | contiguous, pushed); |
aa01b94c | 2736 | assert(((int64_t) (contiguous - pushed)) >= 0); |
e6ee4eab | 2737 | if ((contiguous != pushed) || |
6acdf328 | 2738 | (((int64_t) contiguous - pushed) > 0 || contiguous == 0)) { |
04ef1097 MD |
2739 | ret = 1; /* Data is pending */ |
2740 | goto end; | |
2741 | } | |
2742 | } else { | |
2743 | ret = ustctl_get_next_subbuf(stream->ustream); | |
2744 | if (ret == 0) { | |
2745 | /* | |
2746 | * There is still data so let's put back this | |
2747 | * subbuffer. | |
2748 | */ | |
2749 | ret = ustctl_put_subbuf(stream->ustream); | |
2750 | assert(ret == 0); | |
2751 | ret = 1; /* Data is pending */ | |
2752 | goto end; | |
2753 | } | |
ca22feea DG |
2754 | } |
2755 | ||
6d805429 DG |
2756 | /* Data is NOT pending so ready to be read. */ |
2757 | ret = 0; | |
ca22feea | 2758 | |
6efae65e DG |
2759 | end: |
2760 | return ret; | |
ca22feea | 2761 | } |
d88aee68 | 2762 | |
6d574024 DG |
2763 | /* |
2764 | * Stop a given metadata channel timer if enabled and close the wait fd which | |
2765 | * is the poll pipe of the metadata stream. | |
2766 | * | |
2767 | * This MUST be called with the metadata channel acquired. | |
2768 | */ | |
2769 | void lttng_ustconsumer_close_metadata(struct lttng_consumer_channel *metadata) | |
2770 | { | |
2771 | int ret; | |
2772 | ||
2773 | assert(metadata); | |
2774 | assert(metadata->type == CONSUMER_CHANNEL_TYPE_METADATA); | |
2775 | ||
2776 | DBG("Closing metadata channel key %" PRIu64, metadata->key); | |
2777 | ||
2778 | if (metadata->switch_timer_enabled == 1) { | |
2779 | consumer_timer_switch_stop(metadata); | |
2780 | } | |
2781 | ||
2782 | if (!metadata->metadata_stream) { | |
2783 | goto end; | |
2784 | } | |
2785 | ||
2786 | /* | |
2787 | * Closing write side so the thread monitoring the stream wakes up if any | |
2788 | * and clean the metadata stream. | |
2789 | */ | |
2790 | if (metadata->metadata_stream->ust_metadata_poll_pipe[1] >= 0) { | |
2791 | ret = close(metadata->metadata_stream->ust_metadata_poll_pipe[1]); | |
2792 | if (ret < 0) { | |
2793 | PERROR("closing metadata pipe write side"); | |
2794 | } | |
2795 | metadata->metadata_stream->ust_metadata_poll_pipe[1] = -1; | |
2796 | } | |
2797 | ||
2798 | end: | |
2799 | return; | |
2800 | } | |
2801 | ||
d88aee68 DG |
2802 | /* |
2803 | * Close every metadata stream wait fd of the metadata hash table. This | |
2804 | * function MUST be used very carefully so not to run into a race between the | |
2805 | * metadata thread handling streams and this function closing their wait fd. | |
2806 | * | |
2807 | * For UST, this is used when the session daemon hangs up. Its the metadata | |
2808 | * producer so calling this is safe because we are assured that no state change | |
2809 | * can occur in the metadata thread for the streams in the hash table. | |
2810 | */ | |
6d574024 | 2811 | void lttng_ustconsumer_close_all_metadata(struct lttng_ht *metadata_ht) |
d88aee68 | 2812 | { |
d88aee68 DG |
2813 | struct lttng_ht_iter iter; |
2814 | struct lttng_consumer_stream *stream; | |
2815 | ||
2816 | assert(metadata_ht); | |
2817 | assert(metadata_ht->ht); | |
2818 | ||
2819 | DBG("UST consumer closing all metadata streams"); | |
2820 | ||
2821 | rcu_read_lock(); | |
2822 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, | |
2823 | node.node) { | |
9ce5646a MD |
2824 | |
2825 | health_code_update(); | |
2826 | ||
be2b50c7 | 2827 | pthread_mutex_lock(&stream->chan->lock); |
6d574024 | 2828 | lttng_ustconsumer_close_metadata(stream->chan); |
be2b50c7 DG |
2829 | pthread_mutex_unlock(&stream->chan->lock); |
2830 | ||
d88aee68 DG |
2831 | } |
2832 | rcu_read_unlock(); | |
2833 | } | |
d8ef542d MD |
2834 | |
2835 | void lttng_ustconsumer_close_stream_wakeup(struct lttng_consumer_stream *stream) | |
2836 | { | |
2837 | int ret; | |
2838 | ||
2839 | ret = ustctl_stream_close_wakeup_fd(stream->ustream); | |
2840 | if (ret < 0) { | |
2841 | ERR("Unable to close wakeup fd"); | |
2842 | } | |
2843 | } | |
331744e3 | 2844 | |
f666ae70 MD |
2845 | /* |
2846 | * Please refer to consumer-timer.c before adding any lock within this | |
2847 | * function or any of its callees. Timers have a very strict locking | |
2848 | * semantic with respect to teardown. Failure to respect this semantic | |
2849 | * introduces deadlocks. | |
c585821b MD |
2850 | * |
2851 | * DON'T hold the metadata lock when calling this function, else this | |
2852 | * can cause deadlock involving consumer awaiting for metadata to be | |
2853 | * pushed out due to concurrent interaction with the session daemon. | |
f666ae70 | 2854 | */ |
331744e3 | 2855 | int lttng_ustconsumer_request_metadata(struct lttng_consumer_local_data *ctx, |
94d49140 | 2856 | struct lttng_consumer_channel *channel, int timer, int wait) |
331744e3 JD |
2857 | { |
2858 | struct lttcomm_metadata_request_msg request; | |
2859 | struct lttcomm_consumer_msg msg; | |
0c759fc9 | 2860 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
93ec662e | 2861 | uint64_t len, key, offset, version; |
331744e3 JD |
2862 | int ret; |
2863 | ||
2864 | assert(channel); | |
2865 | assert(channel->metadata_cache); | |
2866 | ||
53efb85a MD |
2867 | memset(&request, 0, sizeof(request)); |
2868 | ||
331744e3 JD |
2869 | /* send the metadata request to sessiond */ |
2870 | switch (consumer_data.type) { | |
2871 | case LTTNG_CONSUMER64_UST: | |
2872 | request.bits_per_long = 64; | |
2873 | break; | |
2874 | case LTTNG_CONSUMER32_UST: | |
2875 | request.bits_per_long = 32; | |
2876 | break; | |
2877 | default: | |
2878 | request.bits_per_long = 0; | |
2879 | break; | |
2880 | } | |
2881 | ||
2882 | request.session_id = channel->session_id; | |
1950109e | 2883 | request.session_id_per_pid = channel->session_id_per_pid; |
567eb353 DG |
2884 | /* |
2885 | * Request the application UID here so the metadata of that application can | |
2886 | * be sent back. The channel UID corresponds to the user UID of the session | |
2887 | * used for the rights on the stream file(s). | |
2888 | */ | |
2889 | request.uid = channel->ust_app_uid; | |
331744e3 | 2890 | request.key = channel->key; |
567eb353 | 2891 | |
1950109e | 2892 | DBG("Sending metadata request to sessiond, session id %" PRIu64 |
567eb353 DG |
2893 | ", per-pid %" PRIu64 ", app UID %u and channek key %" PRIu64, |
2894 | request.session_id, request.session_id_per_pid, request.uid, | |
2895 | request.key); | |
331744e3 | 2896 | |
75d83e50 | 2897 | pthread_mutex_lock(&ctx->metadata_socket_lock); |
9ce5646a MD |
2898 | |
2899 | health_code_update(); | |
2900 | ||
331744e3 JD |
2901 | ret = lttcomm_send_unix_sock(ctx->consumer_metadata_socket, &request, |
2902 | sizeof(request)); | |
2903 | if (ret < 0) { | |
2904 | ERR("Asking metadata to sessiond"); | |
2905 | goto end; | |
2906 | } | |
2907 | ||
9ce5646a MD |
2908 | health_code_update(); |
2909 | ||
331744e3 JD |
2910 | /* Receive the metadata from sessiond */ |
2911 | ret = lttcomm_recv_unix_sock(ctx->consumer_metadata_socket, &msg, | |
2912 | sizeof(msg)); | |
2913 | if (ret != sizeof(msg)) { | |
8fd623e0 | 2914 | DBG("Consumer received unexpected message size %d (expects %zu)", |
331744e3 JD |
2915 | ret, sizeof(msg)); |
2916 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); | |
2917 | /* | |
2918 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
2919 | * since the caller handles this. | |
2920 | */ | |
2921 | goto end; | |
2922 | } | |
2923 | ||
9ce5646a MD |
2924 | health_code_update(); |
2925 | ||
331744e3 JD |
2926 | if (msg.cmd_type == LTTNG_ERR_UND) { |
2927 | /* No registry found */ | |
2928 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, | |
2929 | ret_code); | |
2930 | ret = 0; | |
2931 | goto end; | |
2932 | } else if (msg.cmd_type != LTTNG_CONSUMER_PUSH_METADATA) { | |
2933 | ERR("Unexpected cmd_type received %d", msg.cmd_type); | |
2934 | ret = -1; | |
2935 | goto end; | |
2936 | } | |
2937 | ||
2938 | len = msg.u.push_metadata.len; | |
2939 | key = msg.u.push_metadata.key; | |
2940 | offset = msg.u.push_metadata.target_offset; | |
93ec662e | 2941 | version = msg.u.push_metadata.version; |
331744e3 JD |
2942 | |
2943 | assert(key == channel->key); | |
2944 | if (len == 0) { | |
2945 | DBG("No new metadata to receive for key %" PRIu64, key); | |
2946 | } | |
2947 | ||
9ce5646a MD |
2948 | health_code_update(); |
2949 | ||
331744e3 JD |
2950 | /* Tell session daemon we are ready to receive the metadata. */ |
2951 | ret = consumer_send_status_msg(ctx->consumer_metadata_socket, | |
0c759fc9 | 2952 | LTTCOMM_CONSUMERD_SUCCESS); |
331744e3 JD |
2953 | if (ret < 0 || len == 0) { |
2954 | /* | |
2955 | * Somehow, the session daemon is not responding anymore or there is | |
2956 | * nothing to receive. | |
2957 | */ | |
2958 | goto end; | |
2959 | } | |
2960 | ||
9ce5646a MD |
2961 | health_code_update(); |
2962 | ||
1eb682be | 2963 | ret = lttng_ustconsumer_recv_metadata(ctx->consumer_metadata_socket, |
93ec662e | 2964 | key, offset, len, version, channel, timer, wait); |
1eb682be | 2965 | if (ret >= 0) { |
f2a444f1 DG |
2966 | /* |
2967 | * Only send the status msg if the sessiond is alive meaning a positive | |
2968 | * ret code. | |
2969 | */ | |
1eb682be | 2970 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, ret); |
f2a444f1 | 2971 | } |
331744e3 JD |
2972 | ret = 0; |
2973 | ||
2974 | end: | |
9ce5646a MD |
2975 | health_code_update(); |
2976 | ||
75d83e50 | 2977 | pthread_mutex_unlock(&ctx->metadata_socket_lock); |
331744e3 JD |
2978 | return ret; |
2979 | } | |
70190e1c DG |
2980 | |
2981 | /* | |
2982 | * Return the ustctl call for the get stream id. | |
2983 | */ | |
2984 | int lttng_ustconsumer_get_stream_id(struct lttng_consumer_stream *stream, | |
2985 | uint64_t *stream_id) | |
2986 | { | |
2987 | assert(stream); | |
2988 | assert(stream_id); | |
2989 | ||
2990 | return ustctl_get_stream_id(stream->ustream, stream_id); | |
2991 | } |