Commit | Line | Data |
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3bd1e081 MD |
1 | /* |
2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> | |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
4 | * | |
d14d33bf AM |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
3bd1e081 MD |
8 | * |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
d14d33bf AM |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
3bd1e081 MD |
17 | */ |
18 | ||
6c1c0768 | 19 | #define _LGPL_SOURCE |
3bd1e081 | 20 | #include <assert.h> |
f02e1e8a | 21 | #include <lttng/ust-ctl.h> |
3bd1e081 MD |
22 | #include <poll.h> |
23 | #include <pthread.h> | |
24 | #include <stdlib.h> | |
25 | #include <string.h> | |
26 | #include <sys/mman.h> | |
27 | #include <sys/socket.h> | |
dbb5dfe6 | 28 | #include <sys/stat.h> |
3bd1e081 | 29 | #include <sys/types.h> |
77c7c900 | 30 | #include <inttypes.h> |
3bd1e081 | 31 | #include <unistd.h> |
ffe60014 | 32 | #include <urcu/list.h> |
331744e3 | 33 | #include <signal.h> |
29d1a7ae JG |
34 | #include <stdbool.h> |
35 | #include <stdint.h> | |
0857097f | 36 | |
51a9e1c7 | 37 | #include <bin/lttng-consumerd/health-consumerd.h> |
990570ed | 38 | #include <common/common.h> |
10a8a223 | 39 | #include <common/sessiond-comm/sessiond-comm.h> |
00e2e675 | 40 | #include <common/relayd/relayd.h> |
dbb5dfe6 | 41 | #include <common/compat/fcntl.h> |
f263b7fd | 42 | #include <common/compat/endian.h> |
c8fea79c JR |
43 | #include <common/consumer/consumer-metadata-cache.h> |
44 | #include <common/consumer/consumer-stream.h> | |
45 | #include <common/consumer/consumer-timer.h> | |
fe4477ee | 46 | #include <common/utils.h> |
309167d2 | 47 | #include <common/index/index.h> |
29d1a7ae | 48 | #include <common/consumer/consumer.h> |
10a8a223 DG |
49 | |
50 | #include "ust-consumer.h" | |
3bd1e081 | 51 | |
45863397 | 52 | #define INT_MAX_STR_LEN 12 /* includes \0 */ |
4628484a | 53 | |
3bd1e081 MD |
54 | extern struct lttng_consumer_global_data consumer_data; |
55 | extern int consumer_poll_timeout; | |
56 | extern volatile int consumer_quit; | |
57 | ||
58 | /* | |
ffe60014 DG |
59 | * Free channel object and all streams associated with it. This MUST be used |
60 | * only and only if the channel has _NEVER_ been added to the global channel | |
61 | * hash table. | |
3bd1e081 | 62 | */ |
ffe60014 | 63 | static void destroy_channel(struct lttng_consumer_channel *channel) |
3bd1e081 | 64 | { |
ffe60014 DG |
65 | struct lttng_consumer_stream *stream, *stmp; |
66 | ||
67 | assert(channel); | |
68 | ||
69 | DBG("UST consumer cleaning stream list"); | |
70 | ||
71 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
72 | send_node) { | |
9ce5646a MD |
73 | |
74 | health_code_update(); | |
75 | ||
ffe60014 DG |
76 | cds_list_del(&stream->send_node); |
77 | ustctl_destroy_stream(stream->ustream); | |
78 | free(stream); | |
79 | } | |
80 | ||
81 | /* | |
82 | * If a channel is available meaning that was created before the streams | |
83 | * were, delete it. | |
84 | */ | |
85 | if (channel->uchan) { | |
86 | lttng_ustconsumer_del_channel(channel); | |
b83e03c4 | 87 | lttng_ustconsumer_free_channel(channel); |
ffe60014 DG |
88 | } |
89 | free(channel); | |
90 | } | |
3bd1e081 MD |
91 | |
92 | /* | |
ffe60014 | 93 | * Add channel to internal consumer state. |
3bd1e081 | 94 | * |
ffe60014 | 95 | * Returns 0 on success or else a negative value. |
3bd1e081 | 96 | */ |
ffe60014 DG |
97 | static int add_channel(struct lttng_consumer_channel *channel, |
98 | struct lttng_consumer_local_data *ctx) | |
3bd1e081 MD |
99 | { |
100 | int ret = 0; | |
101 | ||
ffe60014 DG |
102 | assert(channel); |
103 | assert(ctx); | |
104 | ||
105 | if (ctx->on_recv_channel != NULL) { | |
106 | ret = ctx->on_recv_channel(channel); | |
107 | if (ret == 0) { | |
d8ef542d | 108 | ret = consumer_add_channel(channel, ctx); |
ffe60014 DG |
109 | } else if (ret < 0) { |
110 | /* Most likely an ENOMEM. */ | |
111 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
112 | goto error; | |
113 | } | |
114 | } else { | |
d8ef542d | 115 | ret = consumer_add_channel(channel, ctx); |
3bd1e081 MD |
116 | } |
117 | ||
d88aee68 | 118 | DBG("UST consumer channel added (key: %" PRIu64 ")", channel->key); |
ffe60014 DG |
119 | |
120 | error: | |
3bd1e081 MD |
121 | return ret; |
122 | } | |
123 | ||
ffe60014 DG |
124 | /* |
125 | * Allocate and return a consumer stream object. If _alloc_ret is not NULL, the | |
126 | * error value if applicable is set in it else it is kept untouched. | |
3bd1e081 | 127 | * |
ffe60014 | 128 | * Return NULL on error else the newly allocated stream object. |
3bd1e081 | 129 | */ |
ffe60014 DG |
130 | static struct lttng_consumer_stream *allocate_stream(int cpu, int key, |
131 | struct lttng_consumer_channel *channel, | |
132 | struct lttng_consumer_local_data *ctx, int *_alloc_ret) | |
133 | { | |
134 | int alloc_ret; | |
135 | struct lttng_consumer_stream *stream = NULL; | |
136 | ||
137 | assert(channel); | |
138 | assert(ctx); | |
139 | ||
29d1a7ae | 140 | stream = consumer_stream_create( |
59db0d42 JG |
141 | channel, |
142 | channel->key, | |
ffe60014 DG |
143 | key, |
144 | LTTNG_CONSUMER_ACTIVE_STREAM, | |
145 | channel->name, | |
146 | channel->uid, | |
147 | channel->gid, | |
148 | channel->relayd_id, | |
149 | channel->session_id, | |
150 | cpu, | |
151 | &alloc_ret, | |
4891ece8 DG |
152 | channel->type, |
153 | channel->monitor); | |
ffe60014 DG |
154 | if (stream == NULL) { |
155 | switch (alloc_ret) { | |
156 | case -ENOENT: | |
157 | /* | |
158 | * We could not find the channel. Can happen if cpu hotplug | |
159 | * happens while tearing down. | |
160 | */ | |
161 | DBG3("Could not find channel"); | |
162 | break; | |
163 | case -ENOMEM: | |
164 | case -EINVAL: | |
165 | default: | |
166 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
167 | break; | |
168 | } | |
169 | goto error; | |
170 | } | |
171 | ||
ffe60014 DG |
172 | error: |
173 | if (_alloc_ret) { | |
174 | *_alloc_ret = alloc_ret; | |
175 | } | |
176 | return stream; | |
177 | } | |
178 | ||
179 | /* | |
180 | * Send the given stream pointer to the corresponding thread. | |
181 | * | |
182 | * Returns 0 on success else a negative value. | |
183 | */ | |
184 | static int send_stream_to_thread(struct lttng_consumer_stream *stream, | |
185 | struct lttng_consumer_local_data *ctx) | |
186 | { | |
dae10966 DG |
187 | int ret; |
188 | struct lttng_pipe *stream_pipe; | |
ffe60014 DG |
189 | |
190 | /* Get the right pipe where the stream will be sent. */ | |
191 | if (stream->metadata_flag) { | |
5ab66908 MD |
192 | ret = consumer_add_metadata_stream(stream); |
193 | if (ret) { | |
194 | ERR("Consumer add metadata stream %" PRIu64 " failed.", | |
195 | stream->key); | |
196 | goto error; | |
197 | } | |
dae10966 | 198 | stream_pipe = ctx->consumer_metadata_pipe; |
ffe60014 | 199 | } else { |
5ab66908 MD |
200 | ret = consumer_add_data_stream(stream); |
201 | if (ret) { | |
202 | ERR("Consumer add stream %" PRIu64 " failed.", | |
203 | stream->key); | |
204 | goto error; | |
205 | } | |
dae10966 | 206 | stream_pipe = ctx->consumer_data_pipe; |
ffe60014 DG |
207 | } |
208 | ||
5ab66908 MD |
209 | /* |
210 | * From this point on, the stream's ownership has been moved away from | |
211 | * the channel and becomes globally visible. | |
212 | */ | |
213 | stream->globally_visible = 1; | |
214 | ||
dae10966 | 215 | ret = lttng_pipe_write(stream_pipe, &stream, sizeof(stream)); |
ffe60014 | 216 | if (ret < 0) { |
dae10966 DG |
217 | ERR("Consumer write %s stream to pipe %d", |
218 | stream->metadata_flag ? "metadata" : "data", | |
219 | lttng_pipe_get_writefd(stream_pipe)); | |
5ab66908 MD |
220 | if (stream->metadata_flag) { |
221 | consumer_del_stream_for_metadata(stream); | |
222 | } else { | |
223 | consumer_del_stream_for_data(stream); | |
224 | } | |
ffe60014 | 225 | } |
5ab66908 | 226 | error: |
ffe60014 DG |
227 | return ret; |
228 | } | |
229 | ||
4628484a MD |
230 | static |
231 | int get_stream_shm_path(char *stream_shm_path, const char *shm_path, int cpu) | |
232 | { | |
45863397 | 233 | char cpu_nr[INT_MAX_STR_LEN]; /* int max len */ |
4628484a MD |
234 | int ret; |
235 | ||
236 | strncpy(stream_shm_path, shm_path, PATH_MAX); | |
237 | stream_shm_path[PATH_MAX - 1] = '\0'; | |
45863397 | 238 | ret = snprintf(cpu_nr, INT_MAX_STR_LEN, "%i", cpu); |
67f8cb8d MD |
239 | if (ret < 0) { |
240 | PERROR("snprintf"); | |
4628484a MD |
241 | goto end; |
242 | } | |
243 | strncat(stream_shm_path, cpu_nr, | |
244 | PATH_MAX - strlen(stream_shm_path) - 1); | |
245 | ret = 0; | |
246 | end: | |
247 | return ret; | |
248 | } | |
249 | ||
d88aee68 DG |
250 | /* |
251 | * Create streams for the given channel using liblttng-ust-ctl. | |
252 | * | |
253 | * Return 0 on success else a negative value. | |
254 | */ | |
ffe60014 DG |
255 | static int create_ust_streams(struct lttng_consumer_channel *channel, |
256 | struct lttng_consumer_local_data *ctx) | |
257 | { | |
258 | int ret, cpu = 0; | |
259 | struct ustctl_consumer_stream *ustream; | |
260 | struct lttng_consumer_stream *stream; | |
261 | ||
262 | assert(channel); | |
263 | assert(ctx); | |
264 | ||
265 | /* | |
266 | * While a stream is available from ustctl. When NULL is returned, we've | |
267 | * reached the end of the possible stream for the channel. | |
268 | */ | |
269 | while ((ustream = ustctl_create_stream(channel->uchan, cpu))) { | |
270 | int wait_fd; | |
04ef1097 | 271 | int ust_metadata_pipe[2]; |
ffe60014 | 272 | |
9ce5646a MD |
273 | health_code_update(); |
274 | ||
04ef1097 MD |
275 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && channel->monitor) { |
276 | ret = utils_create_pipe_cloexec_nonblock(ust_metadata_pipe); | |
277 | if (ret < 0) { | |
278 | ERR("Create ust metadata poll pipe"); | |
279 | goto error; | |
280 | } | |
281 | wait_fd = ust_metadata_pipe[0]; | |
282 | } else { | |
283 | wait_fd = ustctl_stream_get_wait_fd(ustream); | |
284 | } | |
ffe60014 DG |
285 | |
286 | /* Allocate consumer stream object. */ | |
287 | stream = allocate_stream(cpu, wait_fd, channel, ctx, &ret); | |
288 | if (!stream) { | |
289 | goto error_alloc; | |
290 | } | |
291 | stream->ustream = ustream; | |
292 | /* | |
293 | * Store it so we can save multiple function calls afterwards since | |
294 | * this value is used heavily in the stream threads. This is UST | |
295 | * specific so this is why it's done after allocation. | |
296 | */ | |
297 | stream->wait_fd = wait_fd; | |
298 | ||
b31398bb DG |
299 | /* |
300 | * Increment channel refcount since the channel reference has now been | |
301 | * assigned in the allocation process above. | |
302 | */ | |
10a50311 JD |
303 | if (stream->chan->monitor) { |
304 | uatomic_inc(&stream->chan->refcount); | |
305 | } | |
b31398bb | 306 | |
ffe60014 DG |
307 | /* |
308 | * Order is important this is why a list is used. On error, the caller | |
309 | * should clean this list. | |
310 | */ | |
311 | cds_list_add_tail(&stream->send_node, &channel->streams.head); | |
312 | ||
313 | ret = ustctl_get_max_subbuf_size(stream->ustream, | |
314 | &stream->max_sb_size); | |
315 | if (ret < 0) { | |
316 | ERR("ustctl_get_max_subbuf_size failed for stream %s", | |
317 | stream->name); | |
318 | goto error; | |
319 | } | |
320 | ||
321 | /* Do actions once stream has been received. */ | |
322 | if (ctx->on_recv_stream) { | |
323 | ret = ctx->on_recv_stream(stream); | |
324 | if (ret < 0) { | |
325 | goto error; | |
326 | } | |
327 | } | |
328 | ||
d88aee68 | 329 | DBG("UST consumer add stream %s (key: %" PRIu64 ") with relayd id %" PRIu64, |
ffe60014 DG |
330 | stream->name, stream->key, stream->relayd_stream_id); |
331 | ||
332 | /* Set next CPU stream. */ | |
333 | channel->streams.count = ++cpu; | |
d88aee68 DG |
334 | |
335 | /* Keep stream reference when creating metadata. */ | |
336 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) { | |
337 | channel->metadata_stream = stream; | |
8de4f941 JG |
338 | if (channel->monitor) { |
339 | /* Set metadata poll pipe if we created one */ | |
340 | memcpy(stream->ust_metadata_poll_pipe, | |
341 | ust_metadata_pipe, | |
342 | sizeof(ust_metadata_pipe)); | |
343 | } | |
d88aee68 | 344 | } |
ffe60014 DG |
345 | } |
346 | ||
347 | return 0; | |
348 | ||
349 | error: | |
350 | error_alloc: | |
351 | return ret; | |
352 | } | |
353 | ||
4628484a MD |
354 | /* |
355 | * create_posix_shm is never called concurrently within a process. | |
356 | */ | |
357 | static | |
358 | int create_posix_shm(void) | |
359 | { | |
360 | char tmp_name[NAME_MAX]; | |
361 | int shmfd, ret; | |
362 | ||
363 | ret = snprintf(tmp_name, NAME_MAX, "/ust-shm-consumer-%d", getpid()); | |
364 | if (ret < 0) { | |
365 | PERROR("snprintf"); | |
366 | return -1; | |
367 | } | |
368 | /* | |
369 | * Allocate shm, and immediately unlink its shm oject, keeping | |
370 | * only the file descriptor as a reference to the object. | |
371 | * We specifically do _not_ use the / at the beginning of the | |
372 | * pathname so that some OS implementations can keep it local to | |
373 | * the process (POSIX leaves this implementation-defined). | |
374 | */ | |
375 | shmfd = shm_open(tmp_name, O_CREAT | O_EXCL | O_RDWR, 0700); | |
376 | if (shmfd < 0) { | |
377 | PERROR("shm_open"); | |
378 | goto error_shm_open; | |
379 | } | |
380 | ret = shm_unlink(tmp_name); | |
381 | if (ret < 0 && errno != ENOENT) { | |
382 | PERROR("shm_unlink"); | |
383 | goto error_shm_release; | |
384 | } | |
385 | return shmfd; | |
386 | ||
387 | error_shm_release: | |
388 | ret = close(shmfd); | |
389 | if (ret) { | |
390 | PERROR("close"); | |
391 | } | |
392 | error_shm_open: | |
393 | return -1; | |
394 | } | |
395 | ||
396 | static int open_ust_stream_fd(struct lttng_consumer_channel *channel, | |
397 | struct ustctl_consumer_channel_attr *attr, | |
398 | int cpu) | |
399 | { | |
400 | char shm_path[PATH_MAX]; | |
401 | int ret; | |
402 | ||
403 | if (!channel->shm_path[0]) { | |
404 | return create_posix_shm(); | |
405 | } | |
406 | ret = get_stream_shm_path(shm_path, channel->shm_path, cpu); | |
407 | if (ret) { | |
408 | goto error_shm_path; | |
409 | } | |
410 | return run_as_open(shm_path, | |
411 | O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR, | |
412 | channel->uid, channel->gid); | |
413 | ||
414 | error_shm_path: | |
415 | return -1; | |
416 | } | |
417 | ||
ffe60014 DG |
418 | /* |
419 | * Create an UST channel with the given attributes and send it to the session | |
420 | * daemon using the ust ctl API. | |
421 | * | |
422 | * Return 0 on success or else a negative value. | |
423 | */ | |
4628484a MD |
424 | static int create_ust_channel(struct lttng_consumer_channel *channel, |
425 | struct ustctl_consumer_channel_attr *attr, | |
426 | struct ustctl_consumer_channel **ust_chanp) | |
ffe60014 | 427 | { |
4628484a MD |
428 | int ret, nr_stream_fds, i, j; |
429 | int *stream_fds; | |
430 | struct ustctl_consumer_channel *ust_channel; | |
ffe60014 | 431 | |
4628484a | 432 | assert(channel); |
ffe60014 | 433 | assert(attr); |
4628484a | 434 | assert(ust_chanp); |
ffe60014 DG |
435 | |
436 | DBG3("Creating channel to ustctl with attr: [overwrite: %d, " | |
437 | "subbuf_size: %" PRIu64 ", num_subbuf: %" PRIu64 ", " | |
438 | "switch_timer_interval: %u, read_timer_interval: %u, " | |
439 | "output: %d, type: %d", attr->overwrite, attr->subbuf_size, | |
440 | attr->num_subbuf, attr->switch_timer_interval, | |
441 | attr->read_timer_interval, attr->output, attr->type); | |
442 | ||
4628484a MD |
443 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) |
444 | nr_stream_fds = 1; | |
445 | else | |
446 | nr_stream_fds = ustctl_get_nr_stream_per_channel(); | |
447 | stream_fds = zmalloc(nr_stream_fds * sizeof(*stream_fds)); | |
448 | if (!stream_fds) { | |
449 | ret = -1; | |
450 | goto error_alloc; | |
451 | } | |
452 | for (i = 0; i < nr_stream_fds; i++) { | |
453 | stream_fds[i] = open_ust_stream_fd(channel, attr, i); | |
454 | if (stream_fds[i] < 0) { | |
455 | ret = -1; | |
456 | goto error_open; | |
457 | } | |
458 | } | |
459 | ust_channel = ustctl_create_channel(attr, stream_fds, nr_stream_fds); | |
460 | if (!ust_channel) { | |
ffe60014 DG |
461 | ret = -1; |
462 | goto error_create; | |
463 | } | |
4628484a MD |
464 | channel->nr_stream_fds = nr_stream_fds; |
465 | channel->stream_fds = stream_fds; | |
466 | *ust_chanp = ust_channel; | |
ffe60014 DG |
467 | |
468 | return 0; | |
469 | ||
470 | error_create: | |
4628484a MD |
471 | error_open: |
472 | for (j = i - 1; j >= 0; j--) { | |
473 | int closeret; | |
474 | ||
475 | closeret = close(stream_fds[j]); | |
476 | if (closeret) { | |
477 | PERROR("close"); | |
478 | } | |
479 | if (channel->shm_path[0]) { | |
480 | char shm_path[PATH_MAX]; | |
481 | ||
482 | closeret = get_stream_shm_path(shm_path, | |
483 | channel->shm_path, j); | |
484 | if (closeret) { | |
485 | ERR("Cannot get stream shm path"); | |
486 | } | |
487 | closeret = run_as_unlink(shm_path, | |
488 | channel->uid, channel->gid); | |
489 | if (closeret) { | |
4628484a MD |
490 | PERROR("unlink %s", shm_path); |
491 | } | |
492 | } | |
493 | } | |
494 | /* Try to rmdir all directories under shm_path root. */ | |
495 | if (channel->root_shm_path[0]) { | |
496 | (void) run_as_recursive_rmdir(channel->root_shm_path, | |
497 | channel->uid, channel->gid); | |
498 | } | |
499 | free(stream_fds); | |
500 | error_alloc: | |
ffe60014 DG |
501 | return ret; |
502 | } | |
503 | ||
d88aee68 DG |
504 | /* |
505 | * Send a single given stream to the session daemon using the sock. | |
506 | * | |
507 | * Return 0 on success else a negative value. | |
508 | */ | |
ffe60014 DG |
509 | static int send_sessiond_stream(int sock, struct lttng_consumer_stream *stream) |
510 | { | |
511 | int ret; | |
512 | ||
513 | assert(stream); | |
514 | assert(sock >= 0); | |
515 | ||
3eb914c0 | 516 | DBG("UST consumer sending stream %" PRIu64 " to sessiond", stream->key); |
ffe60014 DG |
517 | |
518 | /* Send stream to session daemon. */ | |
519 | ret = ustctl_send_stream_to_sessiond(sock, stream->ustream); | |
520 | if (ret < 0) { | |
521 | goto error; | |
522 | } | |
523 | ||
ffe60014 DG |
524 | error: |
525 | return ret; | |
526 | } | |
527 | ||
528 | /* | |
529 | * Send channel to sessiond. | |
530 | * | |
d88aee68 | 531 | * Return 0 on success or else a negative value. |
ffe60014 DG |
532 | */ |
533 | static int send_sessiond_channel(int sock, | |
534 | struct lttng_consumer_channel *channel, | |
535 | struct lttng_consumer_local_data *ctx, int *relayd_error) | |
536 | { | |
0c759fc9 | 537 | int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
ffe60014 | 538 | struct lttng_consumer_stream *stream; |
6d40f8fa | 539 | uint64_t relayd_id = -1ULL; |
ffe60014 DG |
540 | |
541 | assert(channel); | |
542 | assert(ctx); | |
543 | assert(sock >= 0); | |
544 | ||
545 | DBG("UST consumer sending channel %s to sessiond", channel->name); | |
546 | ||
62285ea4 DG |
547 | if (channel->relayd_id != (uint64_t) -1ULL) { |
548 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
549 | |
550 | health_code_update(); | |
551 | ||
62285ea4 DG |
552 | /* Try to send the stream to the relayd if one is available. */ |
553 | ret = consumer_send_relayd_stream(stream, stream->chan->pathname); | |
554 | if (ret < 0) { | |
555 | /* | |
556 | * Flag that the relayd was the problem here probably due to a | |
557 | * communicaton error on the socket. | |
558 | */ | |
559 | if (relayd_error) { | |
560 | *relayd_error = 1; | |
561 | } | |
725d28b2 | 562 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
ffe60014 | 563 | } |
6d40f8fa JG |
564 | if (relayd_id == -1ULL) { |
565 | relayd_id = stream->relayd_id; | |
a4baae1b JD |
566 | } |
567 | } | |
f2a444f1 | 568 | } |
ffe60014 | 569 | |
f2a444f1 DG |
570 | /* Inform sessiond that we are about to send channel and streams. */ |
571 | ret = consumer_send_status_msg(sock, ret_code); | |
0c759fc9 | 572 | if (ret < 0 || ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
f2a444f1 DG |
573 | /* |
574 | * Either the session daemon is not responding or the relayd died so we | |
575 | * stop now. | |
576 | */ | |
577 | goto error; | |
578 | } | |
579 | ||
580 | /* Send channel to sessiond. */ | |
581 | ret = ustctl_send_channel_to_sessiond(sock, channel->uchan); | |
582 | if (ret < 0) { | |
583 | goto error; | |
584 | } | |
585 | ||
586 | ret = ustctl_channel_close_wakeup_fd(channel->uchan); | |
587 | if (ret < 0) { | |
588 | goto error; | |
589 | } | |
590 | ||
591 | /* The channel was sent successfully to the sessiond at this point. */ | |
592 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
593 | |
594 | health_code_update(); | |
595 | ||
ffe60014 DG |
596 | /* Send stream to session daemon. */ |
597 | ret = send_sessiond_stream(sock, stream); | |
598 | if (ret < 0) { | |
599 | goto error; | |
600 | } | |
601 | } | |
602 | ||
603 | /* Tell sessiond there is no more stream. */ | |
604 | ret = ustctl_send_stream_to_sessiond(sock, NULL); | |
605 | if (ret < 0) { | |
606 | goto error; | |
607 | } | |
608 | ||
609 | DBG("UST consumer NULL stream sent to sessiond"); | |
610 | ||
611 | return 0; | |
612 | ||
613 | error: | |
0c759fc9 | 614 | if (ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
f2a444f1 DG |
615 | ret = -1; |
616 | } | |
ffe60014 DG |
617 | return ret; |
618 | } | |
619 | ||
620 | /* | |
621 | * Creates a channel and streams and add the channel it to the channel internal | |
622 | * state. The created stream must ONLY be sent once the GET_CHANNEL command is | |
623 | * received. | |
624 | * | |
625 | * Return 0 on success or else, a negative value is returned and the channel | |
626 | * MUST be destroyed by consumer_del_channel(). | |
627 | */ | |
628 | static int ask_channel(struct lttng_consumer_local_data *ctx, int sock, | |
629 | struct lttng_consumer_channel *channel, | |
630 | struct ustctl_consumer_channel_attr *attr) | |
3bd1e081 MD |
631 | { |
632 | int ret; | |
633 | ||
ffe60014 DG |
634 | assert(ctx); |
635 | assert(channel); | |
636 | assert(attr); | |
637 | ||
638 | /* | |
639 | * This value is still used by the kernel consumer since for the kernel, | |
640 | * the stream ownership is not IN the consumer so we need to have the | |
641 | * number of left stream that needs to be initialized so we can know when | |
642 | * to delete the channel (see consumer.c). | |
643 | * | |
644 | * As for the user space tracer now, the consumer creates and sends the | |
645 | * stream to the session daemon which only sends them to the application | |
646 | * once every stream of a channel is received making this value useless | |
647 | * because we they will be added to the poll thread before the application | |
648 | * receives them. This ensures that a stream can not hang up during | |
649 | * initilization of a channel. | |
650 | */ | |
651 | channel->nb_init_stream_left = 0; | |
652 | ||
653 | /* The reply msg status is handled in the following call. */ | |
4628484a | 654 | ret = create_ust_channel(channel, attr, &channel->uchan); |
ffe60014 | 655 | if (ret < 0) { |
10a50311 | 656 | goto end; |
3bd1e081 MD |
657 | } |
658 | ||
d8ef542d MD |
659 | channel->wait_fd = ustctl_channel_get_wait_fd(channel->uchan); |
660 | ||
10a50311 JD |
661 | /* |
662 | * For the snapshots (no monitor), we create the metadata streams | |
663 | * on demand, not during the channel creation. | |
664 | */ | |
665 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && !channel->monitor) { | |
666 | ret = 0; | |
667 | goto end; | |
668 | } | |
669 | ||
ffe60014 DG |
670 | /* Open all streams for this channel. */ |
671 | ret = create_ust_streams(channel, ctx); | |
672 | if (ret < 0) { | |
10a50311 | 673 | goto end; |
ffe60014 DG |
674 | } |
675 | ||
10a50311 | 676 | end: |
3bd1e081 MD |
677 | return ret; |
678 | } | |
679 | ||
d88aee68 DG |
680 | /* |
681 | * Send all stream of a channel to the right thread handling it. | |
682 | * | |
683 | * On error, return a negative value else 0 on success. | |
684 | */ | |
685 | static int send_streams_to_thread(struct lttng_consumer_channel *channel, | |
686 | struct lttng_consumer_local_data *ctx) | |
687 | { | |
688 | int ret = 0; | |
689 | struct lttng_consumer_stream *stream, *stmp; | |
690 | ||
691 | assert(channel); | |
692 | assert(ctx); | |
693 | ||
694 | /* Send streams to the corresponding thread. */ | |
695 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
696 | send_node) { | |
9ce5646a MD |
697 | |
698 | health_code_update(); | |
699 | ||
d88aee68 DG |
700 | /* Sending the stream to the thread. */ |
701 | ret = send_stream_to_thread(stream, ctx); | |
702 | if (ret < 0) { | |
703 | /* | |
704 | * If we are unable to send the stream to the thread, there is | |
705 | * a big problem so just stop everything. | |
706 | */ | |
5ab66908 MD |
707 | /* Remove node from the channel stream list. */ |
708 | cds_list_del(&stream->send_node); | |
d88aee68 DG |
709 | goto error; |
710 | } | |
711 | ||
712 | /* Remove node from the channel stream list. */ | |
713 | cds_list_del(&stream->send_node); | |
4891ece8 | 714 | |
d88aee68 DG |
715 | } |
716 | ||
717 | error: | |
718 | return ret; | |
719 | } | |
720 | ||
7972aab2 DG |
721 | /* |
722 | * Flush channel's streams using the given key to retrieve the channel. | |
723 | * | |
724 | * Return 0 on success else an LTTng error code. | |
725 | */ | |
726 | static int flush_channel(uint64_t chan_key) | |
727 | { | |
728 | int ret = 0; | |
729 | struct lttng_consumer_channel *channel; | |
730 | struct lttng_consumer_stream *stream; | |
731 | struct lttng_ht *ht; | |
732 | struct lttng_ht_iter iter; | |
733 | ||
8fd623e0 | 734 | DBG("UST consumer flush channel key %" PRIu64, chan_key); |
7972aab2 | 735 | |
a500c257 | 736 | rcu_read_lock(); |
7972aab2 DG |
737 | channel = consumer_find_channel(chan_key); |
738 | if (!channel) { | |
8fd623e0 | 739 | ERR("UST consumer flush channel %" PRIu64 " not found", chan_key); |
7972aab2 DG |
740 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
741 | goto error; | |
742 | } | |
743 | ||
744 | ht = consumer_data.stream_per_chan_id_ht; | |
745 | ||
746 | /* For each stream of the channel id, flush it. */ | |
7972aab2 DG |
747 | cds_lfht_for_each_entry_duplicate(ht->ht, |
748 | ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct, | |
749 | &channel->key, &iter.iter, stream, node_channel_id.node) { | |
9ce5646a MD |
750 | |
751 | health_code_update(); | |
752 | ||
0dd01979 | 753 | pthread_mutex_lock(&stream->lock); |
123fff97 JR |
754 | |
755 | /* | |
756 | * Protect against concurrent teardown of a stream. | |
757 | */ | |
758 | if (cds_lfht_is_node_deleted(&stream->node.node)) { | |
759 | goto next; | |
760 | } | |
761 | ||
0dd01979 MD |
762 | if (!stream->quiescent) { |
763 | ustctl_flush_buffer(stream->ustream, 0); | |
764 | stream->quiescent = true; | |
765 | } | |
123fff97 | 766 | next: |
0dd01979 MD |
767 | pthread_mutex_unlock(&stream->lock); |
768 | } | |
769 | error: | |
770 | rcu_read_unlock(); | |
771 | return ret; | |
772 | } | |
773 | ||
774 | /* | |
775 | * Clear quiescent state from channel's streams using the given key to | |
776 | * retrieve the channel. | |
777 | * | |
778 | * Return 0 on success else an LTTng error code. | |
779 | */ | |
780 | static int clear_quiescent_channel(uint64_t chan_key) | |
781 | { | |
782 | int ret = 0; | |
783 | struct lttng_consumer_channel *channel; | |
784 | struct lttng_consumer_stream *stream; | |
785 | struct lttng_ht *ht; | |
786 | struct lttng_ht_iter iter; | |
787 | ||
788 | DBG("UST consumer clear quiescent channel key %" PRIu64, chan_key); | |
789 | ||
790 | rcu_read_lock(); | |
791 | channel = consumer_find_channel(chan_key); | |
792 | if (!channel) { | |
793 | ERR("UST consumer clear quiescent channel %" PRIu64 " not found", chan_key); | |
794 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
795 | goto error; | |
796 | } | |
797 | ||
798 | ht = consumer_data.stream_per_chan_id_ht; | |
799 | ||
800 | /* For each stream of the channel id, clear quiescent state. */ | |
801 | cds_lfht_for_each_entry_duplicate(ht->ht, | |
802 | ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct, | |
803 | &channel->key, &iter.iter, stream, node_channel_id.node) { | |
804 | ||
805 | health_code_update(); | |
806 | ||
807 | pthread_mutex_lock(&stream->lock); | |
808 | stream->quiescent = false; | |
809 | pthread_mutex_unlock(&stream->lock); | |
7972aab2 | 810 | } |
7972aab2 | 811 | error: |
a500c257 | 812 | rcu_read_unlock(); |
7972aab2 DG |
813 | return ret; |
814 | } | |
815 | ||
d88aee68 DG |
816 | /* |
817 | * Close metadata stream wakeup_fd using the given key to retrieve the channel. | |
a500c257 | 818 | * RCU read side lock MUST be acquired before calling this function. |
d88aee68 DG |
819 | * |
820 | * Return 0 on success else an LTTng error code. | |
821 | */ | |
822 | static int close_metadata(uint64_t chan_key) | |
823 | { | |
ea88ca2a | 824 | int ret = 0; |
d88aee68 | 825 | struct lttng_consumer_channel *channel; |
a1ca62da | 826 | unsigned int channel_monitor; |
d88aee68 | 827 | |
8fd623e0 | 828 | DBG("UST consumer close metadata key %" PRIu64, chan_key); |
d88aee68 DG |
829 | |
830 | channel = consumer_find_channel(chan_key); | |
831 | if (!channel) { | |
84cc9aa0 DG |
832 | /* |
833 | * This is possible if the metadata thread has issue a delete because | |
834 | * the endpoint point of the stream hung up. There is no way the | |
835 | * session daemon can know about it thus use a DBG instead of an actual | |
836 | * error. | |
837 | */ | |
838 | DBG("UST consumer close metadata %" PRIu64 " not found", chan_key); | |
d88aee68 DG |
839 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
840 | goto error; | |
841 | } | |
842 | ||
ea88ca2a | 843 | pthread_mutex_lock(&consumer_data.lock); |
a9838785 | 844 | pthread_mutex_lock(&channel->lock); |
a1ca62da | 845 | channel_monitor = channel->monitor; |
73811ecc DG |
846 | if (cds_lfht_is_node_deleted(&channel->node.node)) { |
847 | goto error_unlock; | |
848 | } | |
849 | ||
6d574024 | 850 | lttng_ustconsumer_close_metadata(channel); |
a1ca62da JG |
851 | pthread_mutex_unlock(&channel->lock); |
852 | pthread_mutex_unlock(&consumer_data.lock); | |
d88aee68 | 853 | |
a1ca62da JG |
854 | /* |
855 | * The ownership of a metadata channel depends on the type of | |
856 | * session to which it belongs. In effect, the monitor flag is checked | |
857 | * to determine if this metadata channel is in "snapshot" mode or not. | |
858 | * | |
859 | * In the non-snapshot case, the metadata channel is created along with | |
860 | * a single stream which will remain present until the metadata channel | |
861 | * is destroyed (on the destruction of its session). In this case, the | |
862 | * metadata stream in "monitored" by the metadata poll thread and holds | |
863 | * the ownership of its channel. | |
864 | * | |
865 | * Closing the metadata will cause the metadata stream's "metadata poll | |
866 | * pipe" to be closed. Closing this pipe will wake-up the metadata poll | |
867 | * thread which will teardown the metadata stream which, in return, | |
868 | * deletes the metadata channel. | |
869 | * | |
870 | * In the snapshot case, the metadata stream is created and destroyed | |
871 | * on every snapshot record. Since the channel doesn't have an owner | |
872 | * other than the session daemon, it is safe to destroy it immediately | |
873 | * on reception of the CLOSE_METADATA command. | |
874 | */ | |
875 | if (!channel_monitor) { | |
876 | /* | |
877 | * The channel and consumer_data locks must be | |
878 | * released before this call since consumer_del_channel | |
879 | * re-acquires the channel and consumer_data locks to teardown | |
880 | * the channel and queue its reclamation by the "call_rcu" | |
881 | * worker thread. | |
882 | */ | |
883 | consumer_del_channel(channel); | |
884 | } | |
885 | ||
886 | return ret; | |
ea88ca2a | 887 | error_unlock: |
a9838785 | 888 | pthread_mutex_unlock(&channel->lock); |
ea88ca2a | 889 | pthread_mutex_unlock(&consumer_data.lock); |
d88aee68 DG |
890 | error: |
891 | return ret; | |
892 | } | |
893 | ||
894 | /* | |
895 | * RCU read side lock MUST be acquired before calling this function. | |
896 | * | |
897 | * Return 0 on success else an LTTng error code. | |
898 | */ | |
899 | static int setup_metadata(struct lttng_consumer_local_data *ctx, uint64_t key) | |
900 | { | |
901 | int ret; | |
902 | struct lttng_consumer_channel *metadata; | |
903 | ||
8fd623e0 | 904 | DBG("UST consumer setup metadata key %" PRIu64, key); |
d88aee68 DG |
905 | |
906 | metadata = consumer_find_channel(key); | |
907 | if (!metadata) { | |
908 | ERR("UST consumer push metadata %" PRIu64 " not found", key); | |
909 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
10a50311 JD |
910 | goto end; |
911 | } | |
912 | ||
913 | /* | |
914 | * In no monitor mode, the metadata channel has no stream(s) so skip the | |
915 | * ownership transfer to the metadata thread. | |
916 | */ | |
917 | if (!metadata->monitor) { | |
918 | DBG("Metadata channel in no monitor"); | |
919 | ret = 0; | |
920 | goto end; | |
d88aee68 DG |
921 | } |
922 | ||
923 | /* | |
924 | * Send metadata stream to relayd if one available. Availability is | |
925 | * known if the stream is still in the list of the channel. | |
926 | */ | |
927 | if (cds_list_empty(&metadata->streams.head)) { | |
928 | ERR("Metadata channel key %" PRIu64 ", no stream available.", key); | |
929 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
f5a0c9cf | 930 | goto error_no_stream; |
d88aee68 DG |
931 | } |
932 | ||
933 | /* Send metadata stream to relayd if needed. */ | |
6d40f8fa | 934 | if (metadata->metadata_stream->relayd_id != (uint64_t) -1ULL) { |
62285ea4 DG |
935 | ret = consumer_send_relayd_stream(metadata->metadata_stream, |
936 | metadata->pathname); | |
937 | if (ret < 0) { | |
938 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
939 | goto error; | |
940 | } | |
601262d6 | 941 | ret = consumer_send_relayd_streams_sent( |
6d40f8fa | 942 | metadata->metadata_stream->relayd_id); |
601262d6 JD |
943 | if (ret < 0) { |
944 | ret = LTTCOMM_CONSUMERD_RELAYD_FAIL; | |
945 | goto error; | |
946 | } | |
d88aee68 DG |
947 | } |
948 | ||
949 | ret = send_streams_to_thread(metadata, ctx); | |
950 | if (ret < 0) { | |
951 | /* | |
952 | * If we are unable to send the stream to the thread, there is | |
953 | * a big problem so just stop everything. | |
954 | */ | |
955 | ret = LTTCOMM_CONSUMERD_FATAL; | |
956 | goto error; | |
957 | } | |
958 | /* List MUST be empty after or else it could be reused. */ | |
959 | assert(cds_list_empty(&metadata->streams.head)); | |
960 | ||
10a50311 JD |
961 | ret = 0; |
962 | goto end; | |
d88aee68 DG |
963 | |
964 | error: | |
f2a444f1 DG |
965 | /* |
966 | * Delete metadata channel on error. At this point, the metadata stream can | |
967 | * NOT be monitored by the metadata thread thus having the guarantee that | |
968 | * the stream is still in the local stream list of the channel. This call | |
969 | * will make sure to clean that list. | |
970 | */ | |
f5a0c9cf | 971 | consumer_stream_destroy(metadata->metadata_stream, NULL); |
212d67a2 DG |
972 | cds_list_del(&metadata->metadata_stream->send_node); |
973 | metadata->metadata_stream = NULL; | |
f5a0c9cf | 974 | error_no_stream: |
10a50311 JD |
975 | end: |
976 | return ret; | |
977 | } | |
978 | ||
979 | /* | |
980 | * Snapshot the whole metadata. | |
981 | * | |
982 | * Returns 0 on success, < 0 on error | |
983 | */ | |
984 | static int snapshot_metadata(uint64_t key, char *path, uint64_t relayd_id, | |
985 | struct lttng_consumer_local_data *ctx) | |
986 | { | |
987 | int ret = 0; | |
10a50311 JD |
988 | struct lttng_consumer_channel *metadata_channel; |
989 | struct lttng_consumer_stream *metadata_stream; | |
990 | ||
991 | assert(path); | |
992 | assert(ctx); | |
993 | ||
994 | DBG("UST consumer snapshot metadata with key %" PRIu64 " at path %s", | |
995 | key, path); | |
996 | ||
997 | rcu_read_lock(); | |
998 | ||
999 | metadata_channel = consumer_find_channel(key); | |
1000 | if (!metadata_channel) { | |
6a00837f MD |
1001 | ERR("UST snapshot metadata channel not found for key %" PRIu64, |
1002 | key); | |
10a50311 JD |
1003 | ret = -1; |
1004 | goto error; | |
1005 | } | |
1006 | assert(!metadata_channel->monitor); | |
1007 | ||
9ce5646a MD |
1008 | health_code_update(); |
1009 | ||
10a50311 JD |
1010 | /* |
1011 | * Ask the sessiond if we have new metadata waiting and update the | |
1012 | * consumer metadata cache. | |
1013 | */ | |
94d49140 | 1014 | ret = lttng_ustconsumer_request_metadata(ctx, metadata_channel, 0, 1); |
10a50311 JD |
1015 | if (ret < 0) { |
1016 | goto error; | |
1017 | } | |
1018 | ||
9ce5646a MD |
1019 | health_code_update(); |
1020 | ||
10a50311 JD |
1021 | /* |
1022 | * The metadata stream is NOT created in no monitor mode when the channel | |
1023 | * is created on a sessiond ask channel command. | |
1024 | */ | |
1025 | ret = create_ust_streams(metadata_channel, ctx); | |
1026 | if (ret < 0) { | |
1027 | goto error; | |
1028 | } | |
1029 | ||
1030 | metadata_stream = metadata_channel->metadata_stream; | |
1031 | assert(metadata_stream); | |
1032 | ||
1033 | if (relayd_id != (uint64_t) -1ULL) { | |
6d40f8fa | 1034 | metadata_stream->relayd_id = relayd_id; |
10a50311 JD |
1035 | ret = consumer_send_relayd_stream(metadata_stream, path); |
1036 | if (ret < 0) { | |
1037 | goto error_stream; | |
1038 | } | |
1039 | } else { | |
1040 | ret = utils_create_stream_file(path, metadata_stream->name, | |
1041 | metadata_stream->chan->tracefile_size, | |
1042 | metadata_stream->tracefile_count_current, | |
309167d2 | 1043 | metadata_stream->uid, metadata_stream->gid, NULL); |
10a50311 JD |
1044 | if (ret < 0) { |
1045 | goto error_stream; | |
1046 | } | |
1047 | metadata_stream->out_fd = ret; | |
1048 | metadata_stream->tracefile_size_current = 0; | |
1049 | } | |
1050 | ||
04ef1097 | 1051 | do { |
9ce5646a MD |
1052 | health_code_update(); |
1053 | ||
29d1a7ae | 1054 | ret = lttng_consumer_read_subbuffer(metadata_stream, ctx, true); |
10a50311 | 1055 | if (ret < 0) { |
94d49140 | 1056 | goto error_stream; |
10a50311 | 1057 | } |
04ef1097 | 1058 | } while (ret > 0); |
10a50311 | 1059 | |
10a50311 JD |
1060 | error_stream: |
1061 | /* | |
1062 | * Clean up the stream completly because the next snapshot will use a new | |
1063 | * metadata stream. | |
1064 | */ | |
10a50311 | 1065 | consumer_stream_destroy(metadata_stream, NULL); |
212d67a2 | 1066 | cds_list_del(&metadata_stream->send_node); |
10a50311 JD |
1067 | metadata_channel->metadata_stream = NULL; |
1068 | ||
1069 | error: | |
1070 | rcu_read_unlock(); | |
1071 | return ret; | |
1072 | } | |
1073 | ||
1fdb9a78 JG |
1074 | static |
1075 | int get_current_subbuf_addr(struct lttng_consumer_stream *stream, | |
1076 | const char **addr) | |
1077 | { | |
1078 | int ret; | |
1079 | unsigned long mmap_offset; | |
1080 | const char *mmap_base; | |
1081 | ||
1082 | mmap_base = ustctl_get_mmap_base(stream->ustream); | |
1083 | if (!mmap_base) { | |
1084 | ERR("Failed to get mmap base for stream `%s`", | |
1085 | stream->name); | |
1086 | ret = -EPERM; | |
1087 | goto error; | |
1088 | } | |
1089 | ||
1090 | ret = ustctl_get_mmap_read_offset(stream->ustream, &mmap_offset); | |
1091 | if (ret != 0) { | |
1092 | ERR("Failed to get mmap offset for stream `%s`", stream->name); | |
1093 | ret = -EINVAL; | |
1094 | goto error; | |
1095 | } | |
1096 | ||
1097 | *addr = mmap_base + mmap_offset; | |
1098 | error: | |
1099 | return ret; | |
1100 | ||
1101 | } | |
1102 | ||
10a50311 JD |
1103 | /* |
1104 | * Take a snapshot of all the stream of a channel. | |
1105 | * | |
1106 | * Returns 0 on success, < 0 on error | |
1107 | */ | |
1108 | static int snapshot_channel(uint64_t key, char *path, uint64_t relayd_id, | |
d07ceecd | 1109 | uint64_t nb_packets_per_stream, struct lttng_consumer_local_data *ctx) |
10a50311 JD |
1110 | { |
1111 | int ret; | |
1112 | unsigned use_relayd = 0; | |
1113 | unsigned long consumed_pos, produced_pos; | |
1114 | struct lttng_consumer_channel *channel; | |
1115 | struct lttng_consumer_stream *stream; | |
1116 | ||
1117 | assert(path); | |
1118 | assert(ctx); | |
1119 | ||
1120 | rcu_read_lock(); | |
1121 | ||
1122 | if (relayd_id != (uint64_t) -1ULL) { | |
1123 | use_relayd = 1; | |
1124 | } | |
1125 | ||
1126 | channel = consumer_find_channel(key); | |
1127 | if (!channel) { | |
6a00837f | 1128 | ERR("UST snapshot channel not found for key %" PRIu64, key); |
10a50311 JD |
1129 | ret = -1; |
1130 | goto error; | |
1131 | } | |
1132 | assert(!channel->monitor); | |
6a00837f | 1133 | DBG("UST consumer snapshot channel %" PRIu64, key); |
10a50311 JD |
1134 | |
1135 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
1136 | health_code_update(); |
1137 | ||
10a50311 JD |
1138 | /* Lock stream because we are about to change its state. */ |
1139 | pthread_mutex_lock(&stream->lock); | |
6d40f8fa | 1140 | stream->relayd_id = relayd_id; |
10a50311 JD |
1141 | |
1142 | if (use_relayd) { | |
1143 | ret = consumer_send_relayd_stream(stream, path); | |
1144 | if (ret < 0) { | |
1145 | goto error_unlock; | |
1146 | } | |
1147 | } else { | |
1148 | ret = utils_create_stream_file(path, stream->name, | |
1149 | stream->chan->tracefile_size, | |
1150 | stream->tracefile_count_current, | |
309167d2 | 1151 | stream->uid, stream->gid, NULL); |
10a50311 JD |
1152 | if (ret < 0) { |
1153 | goto error_unlock; | |
1154 | } | |
1155 | stream->out_fd = ret; | |
1156 | stream->tracefile_size_current = 0; | |
1157 | ||
1158 | DBG("UST consumer snapshot stream %s/%s (%" PRIu64 ")", path, | |
1159 | stream->name, stream->key); | |
1160 | } | |
a4baae1b JD |
1161 | if (relayd_id != -1ULL) { |
1162 | ret = consumer_send_relayd_streams_sent(relayd_id); | |
1163 | if (ret < 0) { | |
1164 | goto error_unlock; | |
1165 | } | |
1166 | } | |
10a50311 | 1167 | |
d4d80f77 MD |
1168 | /* |
1169 | * If tracing is active, we want to perform a "full" buffer flush. | |
1170 | * Else, if quiescent, it has already been done by the prior stop. | |
1171 | */ | |
1172 | if (!stream->quiescent) { | |
1173 | ustctl_flush_buffer(stream->ustream, 0); | |
1174 | } | |
10a50311 JD |
1175 | |
1176 | ret = lttng_ustconsumer_take_snapshot(stream); | |
1177 | if (ret < 0) { | |
1178 | ERR("Taking UST snapshot"); | |
1179 | goto error_unlock; | |
1180 | } | |
1181 | ||
1182 | ret = lttng_ustconsumer_get_produced_snapshot(stream, &produced_pos); | |
1183 | if (ret < 0) { | |
1184 | ERR("Produced UST snapshot position"); | |
1185 | goto error_unlock; | |
1186 | } | |
1187 | ||
1188 | ret = lttng_ustconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
1189 | if (ret < 0) { | |
1190 | ERR("Consumerd UST snapshot position"); | |
1191 | goto error_unlock; | |
1192 | } | |
1193 | ||
5c786ded JD |
1194 | /* |
1195 | * The original value is sent back if max stream size is larger than | |
d07ceecd | 1196 | * the possible size of the snapshot. Also, we assume that the session |
5c786ded JD |
1197 | * daemon should never send a maximum stream size that is lower than |
1198 | * subbuffer size. | |
1199 | */ | |
d07ceecd MD |
1200 | consumed_pos = consumer_get_consume_start_pos(consumed_pos, |
1201 | produced_pos, nb_packets_per_stream, | |
1202 | stream->max_sb_size); | |
5c786ded | 1203 | |
10a50311 JD |
1204 | while (consumed_pos < produced_pos) { |
1205 | ssize_t read_len; | |
1206 | unsigned long len, padded_len; | |
1fdb9a78 | 1207 | const char *subbuf_addr; |
ace0e591 | 1208 | struct lttng_buffer_view subbuf_view; |
10a50311 | 1209 | |
9ce5646a MD |
1210 | health_code_update(); |
1211 | ||
10a50311 JD |
1212 | DBG("UST consumer taking snapshot at pos %lu", consumed_pos); |
1213 | ||
1214 | ret = ustctl_get_subbuf(stream->ustream, &consumed_pos); | |
1215 | if (ret < 0) { | |
1216 | if (ret != -EAGAIN) { | |
1217 | PERROR("ustctl_get_subbuf snapshot"); | |
1218 | goto error_close_stream; | |
1219 | } | |
1220 | DBG("UST consumer get subbuf failed. Skipping it."); | |
1221 | consumed_pos += stream->max_sb_size; | |
6e1f2e92 | 1222 | stream->chan->lost_packets++; |
10a50311 JD |
1223 | continue; |
1224 | } | |
1225 | ||
1226 | ret = ustctl_get_subbuf_size(stream->ustream, &len); | |
1227 | if (ret < 0) { | |
1228 | ERR("Snapshot ustctl_get_subbuf_size"); | |
1229 | goto error_put_subbuf; | |
1230 | } | |
1231 | ||
1232 | ret = ustctl_get_padded_subbuf_size(stream->ustream, &padded_len); | |
1233 | if (ret < 0) { | |
1234 | ERR("Snapshot ustctl_get_padded_subbuf_size"); | |
1235 | goto error_put_subbuf; | |
1236 | } | |
1237 | ||
1fdb9a78 JG |
1238 | ret = get_current_subbuf_addr(stream, &subbuf_addr); |
1239 | if (ret) { | |
1240 | goto error_put_subbuf; | |
1241 | } | |
1242 | ||
ace0e591 JG |
1243 | subbuf_view = lttng_buffer_view_init( |
1244 | subbuf_addr, 0, padded_len); | |
1fdb9a78 | 1245 | read_len = lttng_consumer_on_read_subbuffer_mmap(ctx, |
29d1a7ae | 1246 | stream, &subbuf_view, padded_len - len); |
10a50311 JD |
1247 | if (use_relayd) { |
1248 | if (read_len != len) { | |
56591bac | 1249 | ret = -EPERM; |
10a50311 JD |
1250 | goto error_put_subbuf; |
1251 | } | |
1252 | } else { | |
1253 | if (read_len != padded_len) { | |
56591bac | 1254 | ret = -EPERM; |
10a50311 JD |
1255 | goto error_put_subbuf; |
1256 | } | |
1257 | } | |
1258 | ||
1259 | ret = ustctl_put_subbuf(stream->ustream); | |
1260 | if (ret < 0) { | |
1261 | ERR("Snapshot ustctl_put_subbuf"); | |
1262 | goto error_close_stream; | |
1263 | } | |
1264 | consumed_pos += stream->max_sb_size; | |
1265 | } | |
1266 | ||
1267 | /* Simply close the stream so we can use it on the next snapshot. */ | |
1268 | consumer_stream_close(stream); | |
1269 | pthread_mutex_unlock(&stream->lock); | |
1270 | } | |
1271 | ||
1272 | rcu_read_unlock(); | |
1273 | return 0; | |
1274 | ||
1275 | error_put_subbuf: | |
1276 | if (ustctl_put_subbuf(stream->ustream) < 0) { | |
1277 | ERR("Snapshot ustctl_put_subbuf"); | |
1278 | } | |
1279 | error_close_stream: | |
1280 | consumer_stream_close(stream); | |
1281 | error_unlock: | |
1282 | pthread_mutex_unlock(&stream->lock); | |
1283 | error: | |
1284 | rcu_read_unlock(); | |
d88aee68 DG |
1285 | return ret; |
1286 | } | |
1287 | ||
331744e3 | 1288 | /* |
c585821b MD |
1289 | * Receive the metadata updates from the sessiond. Supports receiving |
1290 | * overlapping metadata, but is needs to always belong to a contiguous | |
1291 | * range starting from 0. | |
1292 | * Be careful about the locks held when calling this function: it needs | |
1293 | * the metadata cache flush to concurrently progress in order to | |
1294 | * complete. | |
331744e3 JD |
1295 | */ |
1296 | int lttng_ustconsumer_recv_metadata(int sock, uint64_t key, uint64_t offset, | |
93ec662e JD |
1297 | uint64_t len, uint64_t version, |
1298 | struct lttng_consumer_channel *channel, int timer, int wait) | |
331744e3 | 1299 | { |
0c759fc9 | 1300 | int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
331744e3 JD |
1301 | char *metadata_str; |
1302 | ||
8fd623e0 | 1303 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, len); |
331744e3 JD |
1304 | |
1305 | metadata_str = zmalloc(len * sizeof(char)); | |
1306 | if (!metadata_str) { | |
1307 | PERROR("zmalloc metadata string"); | |
1308 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; | |
1309 | goto end; | |
1310 | } | |
1311 | ||
9ce5646a MD |
1312 | health_code_update(); |
1313 | ||
331744e3 JD |
1314 | /* Receive metadata string. */ |
1315 | ret = lttcomm_recv_unix_sock(sock, metadata_str, len); | |
1316 | if (ret < 0) { | |
1317 | /* Session daemon is dead so return gracefully. */ | |
1318 | ret_code = ret; | |
1319 | goto end_free; | |
1320 | } | |
1321 | ||
9ce5646a MD |
1322 | health_code_update(); |
1323 | ||
331744e3 | 1324 | pthread_mutex_lock(&channel->metadata_cache->lock); |
93ec662e JD |
1325 | ret = consumer_metadata_cache_write(channel, offset, len, version, |
1326 | metadata_str); | |
331744e3 JD |
1327 | if (ret < 0) { |
1328 | /* Unable to handle metadata. Notify session daemon. */ | |
1329 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
a32bd775 DG |
1330 | /* |
1331 | * Skip metadata flush on write error since the offset and len might | |
1332 | * not have been updated which could create an infinite loop below when | |
1333 | * waiting for the metadata cache to be flushed. | |
1334 | */ | |
1335 | pthread_mutex_unlock(&channel->metadata_cache->lock); | |
a32bd775 | 1336 | goto end_free; |
331744e3 JD |
1337 | } |
1338 | pthread_mutex_unlock(&channel->metadata_cache->lock); | |
1339 | ||
94d49140 JD |
1340 | if (!wait) { |
1341 | goto end_free; | |
1342 | } | |
5e41ebe1 | 1343 | while (consumer_metadata_cache_flushed(channel, offset + len, timer)) { |
331744e3 | 1344 | DBG("Waiting for metadata to be flushed"); |
9ce5646a MD |
1345 | |
1346 | health_code_update(); | |
1347 | ||
331744e3 JD |
1348 | usleep(DEFAULT_METADATA_AVAILABILITY_WAIT_TIME); |
1349 | } | |
1350 | ||
1351 | end_free: | |
1352 | free(metadata_str); | |
1353 | end: | |
1354 | return ret_code; | |
1355 | } | |
1356 | ||
4cbc1a04 DG |
1357 | /* |
1358 | * Receive command from session daemon and process it. | |
1359 | * | |
1360 | * Return 1 on success else a negative value or 0. | |
1361 | */ | |
3bd1e081 MD |
1362 | int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
1363 | int sock, struct pollfd *consumer_sockpoll) | |
1364 | { | |
1365 | ssize_t ret; | |
0c759fc9 | 1366 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
3bd1e081 | 1367 | struct lttcomm_consumer_msg msg; |
ffe60014 | 1368 | struct lttng_consumer_channel *channel = NULL; |
3bd1e081 | 1369 | |
9ce5646a MD |
1370 | health_code_update(); |
1371 | ||
3bd1e081 MD |
1372 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); |
1373 | if (ret != sizeof(msg)) { | |
173af62f DG |
1374 | DBG("Consumer received unexpected message size %zd (expects %zu)", |
1375 | ret, sizeof(msg)); | |
3be74084 DG |
1376 | /* |
1377 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
1378 | * since the caller handles this. | |
1379 | */ | |
489f70e9 | 1380 | if (ret > 0) { |
c6857fcf | 1381 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
489f70e9 MD |
1382 | ret = -1; |
1383 | } | |
3bd1e081 MD |
1384 | return ret; |
1385 | } | |
9ce5646a MD |
1386 | |
1387 | health_code_update(); | |
1388 | ||
84382d49 MD |
1389 | /* deprecated */ |
1390 | assert(msg.cmd_type != LTTNG_CONSUMER_STOP); | |
3bd1e081 | 1391 | |
9ce5646a MD |
1392 | health_code_update(); |
1393 | ||
3f8e211f | 1394 | /* relayd needs RCU read-side lock */ |
b0b335c8 MD |
1395 | rcu_read_lock(); |
1396 | ||
3bd1e081 | 1397 | switch (msg.cmd_type) { |
00e2e675 DG |
1398 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
1399 | { | |
f50f23d9 | 1400 | /* Session daemon status message are handled in the following call. */ |
028ba707 | 1401 | consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
7735ef9e | 1402 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, |
d3e2ba59 JD |
1403 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id, |
1404 | msg.u.relayd_sock.relayd_session_id); | |
00e2e675 DG |
1405 | goto end_nosignal; |
1406 | } | |
173af62f DG |
1407 | case LTTNG_CONSUMER_DESTROY_RELAYD: |
1408 | { | |
a6ba4fe1 | 1409 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
173af62f DG |
1410 | struct consumer_relayd_sock_pair *relayd; |
1411 | ||
a6ba4fe1 | 1412 | DBG("UST consumer destroying relayd %" PRIu64, index); |
173af62f DG |
1413 | |
1414 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 1415 | relayd = consumer_find_relayd(index); |
173af62f | 1416 | if (relayd == NULL) { |
3448e266 | 1417 | DBG("Unable to find relayd %" PRIu64, index); |
e462382a | 1418 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
173af62f DG |
1419 | } |
1420 | ||
a6ba4fe1 DG |
1421 | /* |
1422 | * Each relayd socket pair has a refcount of stream attached to it | |
1423 | * which tells if the relayd is still active or not depending on the | |
1424 | * refcount value. | |
1425 | * | |
1426 | * This will set the destroy flag of the relayd object and destroy it | |
1427 | * if the refcount reaches zero when called. | |
1428 | * | |
1429 | * The destroy can happen either here or when a stream fd hangs up. | |
1430 | */ | |
f50f23d9 DG |
1431 | if (relayd) { |
1432 | consumer_flag_relayd_for_destroy(relayd); | |
1433 | } | |
1434 | ||
d88aee68 | 1435 | goto end_msg_sessiond; |
173af62f | 1436 | } |
3bd1e081 MD |
1437 | case LTTNG_CONSUMER_UPDATE_STREAM: |
1438 | { | |
3f8e211f | 1439 | rcu_read_unlock(); |
7ad0a0cb | 1440 | return -ENOSYS; |
3bd1e081 | 1441 | } |
6d805429 | 1442 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 1443 | { |
3be74084 | 1444 | int ret, is_data_pending; |
6d805429 | 1445 | uint64_t id = msg.u.data_pending.session_id; |
ca22feea | 1446 | |
6d805429 | 1447 | DBG("UST consumer data pending command for id %" PRIu64, id); |
ca22feea | 1448 | |
3be74084 | 1449 | is_data_pending = consumer_data_pending(id); |
ca22feea DG |
1450 | |
1451 | /* Send back returned value to session daemon */ | |
3be74084 DG |
1452 | ret = lttcomm_send_unix_sock(sock, &is_data_pending, |
1453 | sizeof(is_data_pending)); | |
ca22feea | 1454 | if (ret < 0) { |
3be74084 | 1455 | DBG("Error when sending the data pending ret code: %d", ret); |
489f70e9 | 1456 | goto error_fatal; |
ca22feea | 1457 | } |
f50f23d9 DG |
1458 | |
1459 | /* | |
1460 | * No need to send back a status message since the data pending | |
1461 | * returned value is the response. | |
1462 | */ | |
ca22feea | 1463 | break; |
53632229 | 1464 | } |
ffe60014 DG |
1465 | case LTTNG_CONSUMER_ASK_CHANNEL_CREATION: |
1466 | { | |
1467 | int ret; | |
1468 | struct ustctl_consumer_channel_attr attr; | |
1469 | ||
1470 | /* Create a plain object and reserve a channel key. */ | |
11785f65 JG |
1471 | channel = consumer_allocate_channel( |
1472 | msg.u.ask_channel.key, | |
1473 | msg.u.ask_channel.session_id, | |
1474 | msg.u.ask_channel.pathname, | |
1475 | msg.u.ask_channel.name, | |
1476 | msg.u.ask_channel.uid, | |
1477 | msg.u.ask_channel.gid, | |
1478 | msg.u.ask_channel.relayd_id, | |
1624d5b7 JD |
1479 | (enum lttng_event_output) msg.u.ask_channel.output, |
1480 | msg.u.ask_channel.tracefile_size, | |
2bba9e53 | 1481 | msg.u.ask_channel.tracefile_count, |
1950109e | 1482 | msg.u.ask_channel.session_id_per_pid, |
ecc48a90 | 1483 | msg.u.ask_channel.monitor, |
d7ba1388 | 1484 | msg.u.ask_channel.live_timer_interval, |
11785f65 | 1485 | msg.u.ask_channel.is_live, |
3d071855 | 1486 | msg.u.ask_channel.root_shm_path, |
d7ba1388 | 1487 | msg.u.ask_channel.shm_path); |
ffe60014 DG |
1488 | if (!channel) { |
1489 | goto end_channel_error; | |
1490 | } | |
1491 | ||
567eb353 DG |
1492 | /* |
1493 | * Assign UST application UID to the channel. This value is ignored for | |
1494 | * per PID buffers. This is specific to UST thus setting this after the | |
1495 | * allocation. | |
1496 | */ | |
1497 | channel->ust_app_uid = msg.u.ask_channel.ust_app_uid; | |
1498 | ||
ffe60014 DG |
1499 | /* Build channel attributes from received message. */ |
1500 | attr.subbuf_size = msg.u.ask_channel.subbuf_size; | |
1501 | attr.num_subbuf = msg.u.ask_channel.num_subbuf; | |
1502 | attr.overwrite = msg.u.ask_channel.overwrite; | |
1503 | attr.switch_timer_interval = msg.u.ask_channel.switch_timer_interval; | |
1504 | attr.read_timer_interval = msg.u.ask_channel.read_timer_interval; | |
7972aab2 | 1505 | attr.chan_id = msg.u.ask_channel.chan_id; |
ffe60014 DG |
1506 | memcpy(attr.uuid, msg.u.ask_channel.uuid, sizeof(attr.uuid)); |
1507 | ||
0c759fc9 DG |
1508 | /* Match channel buffer type to the UST abi. */ |
1509 | switch (msg.u.ask_channel.output) { | |
1510 | case LTTNG_EVENT_MMAP: | |
1511 | default: | |
1512 | attr.output = LTTNG_UST_MMAP; | |
1513 | break; | |
1514 | } | |
1515 | ||
ffe60014 DG |
1516 | /* Translate and save channel type. */ |
1517 | switch (msg.u.ask_channel.type) { | |
1518 | case LTTNG_UST_CHAN_PER_CPU: | |
1519 | channel->type = CONSUMER_CHANNEL_TYPE_DATA; | |
1520 | attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8633d6e3 MD |
1521 | /* |
1522 | * Set refcount to 1 for owner. Below, we will | |
1523 | * pass ownership to the | |
1524 | * consumer_thread_channel_poll() thread. | |
1525 | */ | |
1526 | channel->refcount = 1; | |
ffe60014 DG |
1527 | break; |
1528 | case LTTNG_UST_CHAN_METADATA: | |
1529 | channel->type = CONSUMER_CHANNEL_TYPE_METADATA; | |
1530 | attr.type = LTTNG_UST_CHAN_METADATA; | |
1531 | break; | |
1532 | default: | |
1533 | assert(0); | |
1534 | goto error_fatal; | |
1535 | }; | |
1536 | ||
9ce5646a MD |
1537 | health_code_update(); |
1538 | ||
ffe60014 DG |
1539 | ret = ask_channel(ctx, sock, channel, &attr); |
1540 | if (ret < 0) { | |
1541 | goto end_channel_error; | |
1542 | } | |
1543 | ||
fc643247 MD |
1544 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
1545 | ret = consumer_metadata_cache_allocate(channel); | |
1546 | if (ret < 0) { | |
1547 | ERR("Allocating metadata cache"); | |
1548 | goto end_channel_error; | |
1549 | } | |
1550 | consumer_timer_switch_start(channel, attr.switch_timer_interval); | |
1551 | attr.switch_timer_interval = 0; | |
94d49140 JD |
1552 | } else { |
1553 | consumer_timer_live_start(channel, | |
1554 | msg.u.ask_channel.live_timer_interval); | |
fc643247 MD |
1555 | } |
1556 | ||
9ce5646a MD |
1557 | health_code_update(); |
1558 | ||
ffe60014 DG |
1559 | /* |
1560 | * Add the channel to the internal state AFTER all streams were created | |
1561 | * and successfully sent to session daemon. This way, all streams must | |
1562 | * be ready before this channel is visible to the threads. | |
fc643247 MD |
1563 | * If add_channel succeeds, ownership of the channel is |
1564 | * passed to consumer_thread_channel_poll(). | |
ffe60014 DG |
1565 | */ |
1566 | ret = add_channel(channel, ctx); | |
1567 | if (ret < 0) { | |
ea88ca2a MD |
1568 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
1569 | if (channel->switch_timer_enabled == 1) { | |
1570 | consumer_timer_switch_stop(channel); | |
1571 | } | |
1572 | consumer_metadata_cache_destroy(channel); | |
1573 | } | |
d3e2ba59 JD |
1574 | if (channel->live_timer_enabled == 1) { |
1575 | consumer_timer_live_stop(channel); | |
1576 | } | |
ffe60014 DG |
1577 | goto end_channel_error; |
1578 | } | |
1579 | ||
9ce5646a MD |
1580 | health_code_update(); |
1581 | ||
ffe60014 DG |
1582 | /* |
1583 | * Channel and streams are now created. Inform the session daemon that | |
1584 | * everything went well and should wait to receive the channel and | |
1585 | * streams with ustctl API. | |
1586 | */ | |
1587 | ret = consumer_send_status_channel(sock, channel); | |
1588 | if (ret < 0) { | |
1589 | /* | |
489f70e9 | 1590 | * There is probably a problem on the socket. |
ffe60014 | 1591 | */ |
489f70e9 | 1592 | goto error_fatal; |
ffe60014 DG |
1593 | } |
1594 | ||
1595 | break; | |
1596 | } | |
1597 | case LTTNG_CONSUMER_GET_CHANNEL: | |
1598 | { | |
1599 | int ret, relayd_err = 0; | |
d88aee68 | 1600 | uint64_t key = msg.u.get_channel.key; |
ffe60014 | 1601 | struct lttng_consumer_channel *channel; |
ffe60014 DG |
1602 | |
1603 | channel = consumer_find_channel(key); | |
1604 | if (!channel) { | |
8fd623e0 | 1605 | ERR("UST consumer get channel key %" PRIu64 " not found", key); |
e462382a | 1606 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
ffe60014 DG |
1607 | goto end_msg_sessiond; |
1608 | } | |
1609 | ||
9ce5646a MD |
1610 | health_code_update(); |
1611 | ||
ffe60014 DG |
1612 | /* Send everything to sessiond. */ |
1613 | ret = send_sessiond_channel(sock, channel, ctx, &relayd_err); | |
1614 | if (ret < 0) { | |
1615 | if (relayd_err) { | |
1616 | /* | |
1617 | * We were unable to send to the relayd the stream so avoid | |
1618 | * sending back a fatal error to the thread since this is OK | |
f2a444f1 DG |
1619 | * and the consumer can continue its work. The above call |
1620 | * has sent the error status message to the sessiond. | |
ffe60014 | 1621 | */ |
f2a444f1 | 1622 | goto end_nosignal; |
ffe60014 DG |
1623 | } |
1624 | /* | |
1625 | * The communicaton was broken hence there is a bad state between | |
1626 | * the consumer and sessiond so stop everything. | |
1627 | */ | |
1628 | goto error_fatal; | |
1629 | } | |
1630 | ||
9ce5646a MD |
1631 | health_code_update(); |
1632 | ||
10a50311 JD |
1633 | /* |
1634 | * In no monitor mode, the streams ownership is kept inside the channel | |
1635 | * so don't send them to the data thread. | |
1636 | */ | |
1637 | if (!channel->monitor) { | |
1638 | goto end_msg_sessiond; | |
1639 | } | |
1640 | ||
d88aee68 DG |
1641 | ret = send_streams_to_thread(channel, ctx); |
1642 | if (ret < 0) { | |
1643 | /* | |
1644 | * If we are unable to send the stream to the thread, there is | |
1645 | * a big problem so just stop everything. | |
1646 | */ | |
1647 | goto error_fatal; | |
ffe60014 | 1648 | } |
ffe60014 DG |
1649 | /* List MUST be empty after or else it could be reused. */ |
1650 | assert(cds_list_empty(&channel->streams.head)); | |
d88aee68 DG |
1651 | goto end_msg_sessiond; |
1652 | } | |
1653 | case LTTNG_CONSUMER_DESTROY_CHANNEL: | |
1654 | { | |
1655 | uint64_t key = msg.u.destroy_channel.key; | |
d88aee68 | 1656 | |
a0cbdd2e MD |
1657 | /* |
1658 | * Only called if streams have not been sent to stream | |
1659 | * manager thread. However, channel has been sent to | |
1660 | * channel manager thread. | |
1661 | */ | |
1662 | notify_thread_del_channel(ctx, key); | |
d88aee68 | 1663 | goto end_msg_sessiond; |
ffe60014 | 1664 | } |
d88aee68 DG |
1665 | case LTTNG_CONSUMER_CLOSE_METADATA: |
1666 | { | |
1667 | int ret; | |
1668 | ||
1669 | ret = close_metadata(msg.u.close_metadata.key); | |
1670 | if (ret != 0) { | |
1671 | ret_code = ret; | |
1672 | } | |
1673 | ||
1674 | goto end_msg_sessiond; | |
1675 | } | |
7972aab2 DG |
1676 | case LTTNG_CONSUMER_FLUSH_CHANNEL: |
1677 | { | |
1678 | int ret; | |
1679 | ||
1680 | ret = flush_channel(msg.u.flush_channel.key); | |
1681 | if (ret != 0) { | |
1682 | ret_code = ret; | |
1683 | } | |
1684 | ||
1685 | goto end_msg_sessiond; | |
1686 | } | |
0dd01979 MD |
1687 | case LTTNG_CONSUMER_CLEAR_QUIESCENT_CHANNEL: |
1688 | { | |
1689 | int ret; | |
1690 | ||
1691 | ret = clear_quiescent_channel( | |
1692 | msg.u.clear_quiescent_channel.key); | |
1693 | if (ret != 0) { | |
1694 | ret_code = ret; | |
1695 | } | |
1696 | ||
1697 | goto end_msg_sessiond; | |
1698 | } | |
d88aee68 | 1699 | case LTTNG_CONSUMER_PUSH_METADATA: |
ffe60014 DG |
1700 | { |
1701 | int ret; | |
d88aee68 | 1702 | uint64_t len = msg.u.push_metadata.len; |
d88aee68 | 1703 | uint64_t key = msg.u.push_metadata.key; |
331744e3 | 1704 | uint64_t offset = msg.u.push_metadata.target_offset; |
93ec662e | 1705 | uint64_t version = msg.u.push_metadata.version; |
ffe60014 DG |
1706 | struct lttng_consumer_channel *channel; |
1707 | ||
8fd623e0 DG |
1708 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, |
1709 | len); | |
ffe60014 DG |
1710 | |
1711 | channel = consumer_find_channel(key); | |
1712 | if (!channel) { | |
000baf6a DG |
1713 | /* |
1714 | * This is possible if the metadata creation on the consumer side | |
1715 | * is in flight vis-a-vis a concurrent push metadata from the | |
1716 | * session daemon. Simply return that the channel failed and the | |
1717 | * session daemon will handle that message correctly considering | |
1718 | * that this race is acceptable thus the DBG() statement here. | |
1719 | */ | |
1720 | DBG("UST consumer push metadata %" PRIu64 " not found", key); | |
1721 | ret_code = LTTCOMM_CONSUMERD_CHANNEL_FAIL; | |
4a2eb0ca | 1722 | goto end_msg_sessiond; |
d88aee68 DG |
1723 | } |
1724 | ||
9ce5646a MD |
1725 | health_code_update(); |
1726 | ||
c585821b MD |
1727 | if (!len) { |
1728 | /* | |
1729 | * There is nothing to receive. We have simply | |
1730 | * checked whether the channel can be found. | |
1731 | */ | |
1732 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1733 | goto end_msg_sessiond; | |
1734 | } | |
1735 | ||
d88aee68 | 1736 | /* Tell session daemon we are ready to receive the metadata. */ |
0c759fc9 | 1737 | ret = consumer_send_status_msg(sock, LTTCOMM_CONSUMERD_SUCCESS); |
ffe60014 DG |
1738 | if (ret < 0) { |
1739 | /* Somehow, the session daemon is not responding anymore. */ | |
d88aee68 DG |
1740 | goto error_fatal; |
1741 | } | |
1742 | ||
9ce5646a MD |
1743 | health_code_update(); |
1744 | ||
d88aee68 | 1745 | /* Wait for more data. */ |
9ce5646a MD |
1746 | health_poll_entry(); |
1747 | ret = lttng_consumer_poll_socket(consumer_sockpoll); | |
1748 | health_poll_exit(); | |
84382d49 | 1749 | if (ret) { |
489f70e9 | 1750 | goto error_fatal; |
d88aee68 DG |
1751 | } |
1752 | ||
9ce5646a MD |
1753 | health_code_update(); |
1754 | ||
331744e3 | 1755 | ret = lttng_ustconsumer_recv_metadata(sock, key, offset, |
93ec662e | 1756 | len, version, channel, 0, 1); |
d88aee68 | 1757 | if (ret < 0) { |
331744e3 | 1758 | /* error receiving from sessiond */ |
489f70e9 | 1759 | goto error_fatal; |
331744e3 JD |
1760 | } else { |
1761 | ret_code = ret; | |
d88aee68 DG |
1762 | goto end_msg_sessiond; |
1763 | } | |
d88aee68 DG |
1764 | } |
1765 | case LTTNG_CONSUMER_SETUP_METADATA: | |
1766 | { | |
1767 | int ret; | |
1768 | ||
1769 | ret = setup_metadata(ctx, msg.u.setup_metadata.key); | |
1770 | if (ret) { | |
1771 | ret_code = ret; | |
1772 | } | |
1773 | goto end_msg_sessiond; | |
ffe60014 | 1774 | } |
6dc3064a DG |
1775 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
1776 | { | |
10a50311 JD |
1777 | if (msg.u.snapshot_channel.metadata) { |
1778 | ret = snapshot_metadata(msg.u.snapshot_channel.key, | |
1779 | msg.u.snapshot_channel.pathname, | |
1780 | msg.u.snapshot_channel.relayd_id, | |
1781 | ctx); | |
1782 | if (ret < 0) { | |
1783 | ERR("Snapshot metadata failed"); | |
e462382a | 1784 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; |
10a50311 JD |
1785 | } |
1786 | } else { | |
1787 | ret = snapshot_channel(msg.u.snapshot_channel.key, | |
1788 | msg.u.snapshot_channel.pathname, | |
1789 | msg.u.snapshot_channel.relayd_id, | |
d07ceecd | 1790 | msg.u.snapshot_channel.nb_packets_per_stream, |
10a50311 JD |
1791 | ctx); |
1792 | if (ret < 0) { | |
1793 | ERR("Snapshot channel failed"); | |
e462382a | 1794 | ret_code = LTTCOMM_CONSUMERD_CHANNEL_FAIL; |
10a50311 JD |
1795 | } |
1796 | } | |
1797 | ||
9ce5646a | 1798 | health_code_update(); |
6dc3064a DG |
1799 | ret = consumer_send_status_msg(sock, ret_code); |
1800 | if (ret < 0) { | |
1801 | /* Somehow, the session daemon is not responding anymore. */ | |
1802 | goto end_nosignal; | |
1803 | } | |
9ce5646a | 1804 | health_code_update(); |
6dc3064a DG |
1805 | break; |
1806 | } | |
fb83fe64 JD |
1807 | case LTTNG_CONSUMER_DISCARDED_EVENTS: |
1808 | { | |
beb59458 MJ |
1809 | int ret = 0; |
1810 | uint64_t discarded_events; | |
fb83fe64 JD |
1811 | struct lttng_ht_iter iter; |
1812 | struct lttng_ht *ht; | |
1813 | struct lttng_consumer_stream *stream; | |
1814 | uint64_t id = msg.u.discarded_events.session_id; | |
1815 | uint64_t key = msg.u.discarded_events.channel_key; | |
1816 | ||
1817 | DBG("UST consumer discarded events command for session id %" | |
1818 | PRIu64, id); | |
1819 | rcu_read_lock(); | |
1820 | pthread_mutex_lock(&consumer_data.lock); | |
1821 | ||
1822 | ht = consumer_data.stream_list_ht; | |
1823 | ||
1824 | /* | |
1825 | * We only need a reference to the channel, but they are not | |
1826 | * directly indexed, so we just use the first matching stream | |
1827 | * to extract the information we need, we default to 0 if not | |
1828 | * found (no events are dropped if the channel is not yet in | |
1829 | * use). | |
1830 | */ | |
beb59458 | 1831 | discarded_events = 0; |
fb83fe64 JD |
1832 | cds_lfht_for_each_entry_duplicate(ht->ht, |
1833 | ht->hash_fct(&id, lttng_ht_seed), | |
1834 | ht->match_fct, &id, | |
1835 | &iter.iter, stream, node_session_id.node) { | |
1836 | if (stream->chan->key == key) { | |
beb59458 | 1837 | discarded_events = stream->chan->discarded_events; |
fb83fe64 JD |
1838 | break; |
1839 | } | |
1840 | } | |
1841 | pthread_mutex_unlock(&consumer_data.lock); | |
1842 | rcu_read_unlock(); | |
1843 | ||
1844 | DBG("UST consumer discarded events command for session id %" | |
1845 | PRIu64 ", channel key %" PRIu64, id, key); | |
1846 | ||
1847 | health_code_update(); | |
1848 | ||
1849 | /* Send back returned value to session daemon */ | |
beb59458 | 1850 | ret = lttcomm_send_unix_sock(sock, &discarded_events, sizeof(discarded_events)); |
fb83fe64 JD |
1851 | if (ret < 0) { |
1852 | PERROR("send discarded events"); | |
1853 | goto error_fatal; | |
1854 | } | |
1855 | ||
1856 | break; | |
1857 | } | |
1858 | case LTTNG_CONSUMER_LOST_PACKETS: | |
1859 | { | |
9a06e8d4 JG |
1860 | int ret; |
1861 | uint64_t lost_packets; | |
fb83fe64 JD |
1862 | struct lttng_ht_iter iter; |
1863 | struct lttng_ht *ht; | |
1864 | struct lttng_consumer_stream *stream; | |
1865 | uint64_t id = msg.u.lost_packets.session_id; | |
1866 | uint64_t key = msg.u.lost_packets.channel_key; | |
1867 | ||
1868 | DBG("UST consumer lost packets command for session id %" | |
1869 | PRIu64, id); | |
1870 | rcu_read_lock(); | |
1871 | pthread_mutex_lock(&consumer_data.lock); | |
1872 | ||
1873 | ht = consumer_data.stream_list_ht; | |
1874 | ||
1875 | /* | |
1876 | * We only need a reference to the channel, but they are not | |
1877 | * directly indexed, so we just use the first matching stream | |
1878 | * to extract the information we need, we default to 0 if not | |
1879 | * found (no packets lost if the channel is not yet in use). | |
1880 | */ | |
9a06e8d4 | 1881 | lost_packets = 0; |
fb83fe64 JD |
1882 | cds_lfht_for_each_entry_duplicate(ht->ht, |
1883 | ht->hash_fct(&id, lttng_ht_seed), | |
1884 | ht->match_fct, &id, | |
1885 | &iter.iter, stream, node_session_id.node) { | |
1886 | if (stream->chan->key == key) { | |
9a06e8d4 | 1887 | lost_packets = stream->chan->lost_packets; |
fb83fe64 JD |
1888 | break; |
1889 | } | |
1890 | } | |
1891 | pthread_mutex_unlock(&consumer_data.lock); | |
1892 | rcu_read_unlock(); | |
1893 | ||
1894 | DBG("UST consumer lost packets command for session id %" | |
1895 | PRIu64 ", channel key %" PRIu64, id, key); | |
1896 | ||
1897 | health_code_update(); | |
1898 | ||
1899 | /* Send back returned value to session daemon */ | |
9a06e8d4 JG |
1900 | ret = lttcomm_send_unix_sock(sock, &lost_packets, |
1901 | sizeof(lost_packets)); | |
fb83fe64 JD |
1902 | if (ret < 0) { |
1903 | PERROR("send lost packets"); | |
1904 | goto error_fatal; | |
1905 | } | |
1906 | ||
1907 | break; | |
1908 | } | |
3bd1e081 MD |
1909 | default: |
1910 | break; | |
1911 | } | |
3f8e211f | 1912 | |
3bd1e081 | 1913 | end_nosignal: |
b0b335c8 | 1914 | rcu_read_unlock(); |
4cbc1a04 | 1915 | |
9ce5646a MD |
1916 | health_code_update(); |
1917 | ||
4cbc1a04 DG |
1918 | /* |
1919 | * Return 1 to indicate success since the 0 value can be a socket | |
1920 | * shutdown during the recv() or send() call. | |
1921 | */ | |
1922 | return 1; | |
ffe60014 DG |
1923 | |
1924 | end_msg_sessiond: | |
1925 | /* | |
1926 | * The returned value here is not useful since either way we'll return 1 to | |
1927 | * the caller because the session daemon socket management is done | |
1928 | * elsewhere. Returning a negative code or 0 will shutdown the consumer. | |
1929 | */ | |
489f70e9 MD |
1930 | ret = consumer_send_status_msg(sock, ret_code); |
1931 | if (ret < 0) { | |
1932 | goto error_fatal; | |
1933 | } | |
ffe60014 | 1934 | rcu_read_unlock(); |
9ce5646a MD |
1935 | |
1936 | health_code_update(); | |
1937 | ||
ffe60014 DG |
1938 | return 1; |
1939 | end_channel_error: | |
1940 | if (channel) { | |
1941 | /* | |
1942 | * Free channel here since no one has a reference to it. We don't | |
1943 | * free after that because a stream can store this pointer. | |
1944 | */ | |
1945 | destroy_channel(channel); | |
1946 | } | |
1947 | /* We have to send a status channel message indicating an error. */ | |
1948 | ret = consumer_send_status_channel(sock, NULL); | |
1949 | if (ret < 0) { | |
1950 | /* Stop everything if session daemon can not be notified. */ | |
1951 | goto error_fatal; | |
1952 | } | |
1953 | rcu_read_unlock(); | |
9ce5646a MD |
1954 | |
1955 | health_code_update(); | |
1956 | ||
ffe60014 DG |
1957 | return 1; |
1958 | error_fatal: | |
1959 | rcu_read_unlock(); | |
1960 | /* This will issue a consumer stop. */ | |
1961 | return -1; | |
3bd1e081 MD |
1962 | } |
1963 | ||
1fdb9a78 JG |
1964 | void lttng_ustctl_flush_buffer(struct lttng_consumer_stream *stream, |
1965 | int producer_active) | |
3bd1e081 | 1966 | { |
ffe60014 DG |
1967 | assert(stream); |
1968 | assert(stream->ustream); | |
b5c5fc29 | 1969 | |
1fdb9a78 | 1970 | ustctl_flush_buffer(stream->ustream, producer_active); |
d056b477 MD |
1971 | } |
1972 | ||
ffe60014 DG |
1973 | /* |
1974 | * Take a snapshot for a specific fd | |
1975 | * | |
1976 | * Returns 0 on success, < 0 on error | |
1977 | */ | |
1978 | int lttng_ustconsumer_take_snapshot(struct lttng_consumer_stream *stream) | |
3bd1e081 | 1979 | { |
ffe60014 DG |
1980 | assert(stream); |
1981 | assert(stream->ustream); | |
1982 | ||
1983 | return ustctl_snapshot(stream->ustream); | |
3bd1e081 MD |
1984 | } |
1985 | ||
ffe60014 DG |
1986 | /* |
1987 | * Get the produced position | |
1988 | * | |
1989 | * Returns 0 on success, < 0 on error | |
1990 | */ | |
1991 | int lttng_ustconsumer_get_produced_snapshot( | |
1992 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
3bd1e081 | 1993 | { |
ffe60014 DG |
1994 | assert(stream); |
1995 | assert(stream->ustream); | |
1996 | assert(pos); | |
7a57cf92 | 1997 | |
ffe60014 DG |
1998 | return ustctl_snapshot_get_produced(stream->ustream, pos); |
1999 | } | |
7a57cf92 | 2000 | |
10a50311 JD |
2001 | /* |
2002 | * Get the consumed position | |
2003 | * | |
2004 | * Returns 0 on success, < 0 on error | |
2005 | */ | |
2006 | int lttng_ustconsumer_get_consumed_snapshot( | |
2007 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
2008 | { | |
2009 | assert(stream); | |
2010 | assert(stream->ustream); | |
2011 | assert(pos); | |
2012 | ||
2013 | return ustctl_snapshot_get_consumed(stream->ustream, pos); | |
2014 | } | |
2015 | ||
84a182ce DG |
2016 | void lttng_ustconsumer_flush_buffer(struct lttng_consumer_stream *stream, |
2017 | int producer) | |
2018 | { | |
2019 | assert(stream); | |
2020 | assert(stream->ustream); | |
2021 | ||
2022 | ustctl_flush_buffer(stream->ustream, producer); | |
2023 | } | |
2024 | ||
2025 | int lttng_ustconsumer_get_current_timestamp( | |
2026 | struct lttng_consumer_stream *stream, uint64_t *ts) | |
2027 | { | |
2028 | assert(stream); | |
2029 | assert(stream->ustream); | |
2030 | assert(ts); | |
2031 | ||
2032 | return ustctl_get_current_timestamp(stream->ustream, ts); | |
2033 | } | |
2034 | ||
fb83fe64 JD |
2035 | int lttng_ustconsumer_get_sequence_number( |
2036 | struct lttng_consumer_stream *stream, uint64_t *seq) | |
2037 | { | |
2038 | assert(stream); | |
2039 | assert(stream->ustream); | |
2040 | assert(seq); | |
2041 | ||
2042 | return ustctl_get_sequence_number(stream->ustream, seq); | |
2043 | } | |
2044 | ||
ffe60014 | 2045 | /* |
0dd01979 | 2046 | * Called when the stream signals the consumer that it has hung up. |
ffe60014 DG |
2047 | */ |
2048 | void lttng_ustconsumer_on_stream_hangup(struct lttng_consumer_stream *stream) | |
2049 | { | |
2050 | assert(stream); | |
2051 | assert(stream->ustream); | |
2c1dd183 | 2052 | |
0dd01979 MD |
2053 | pthread_mutex_lock(&stream->lock); |
2054 | if (!stream->quiescent) { | |
2055 | ustctl_flush_buffer(stream->ustream, 0); | |
2056 | stream->quiescent = true; | |
2057 | } | |
2058 | pthread_mutex_unlock(&stream->lock); | |
ffe60014 DG |
2059 | stream->hangup_flush_done = 1; |
2060 | } | |
ee77a7b0 | 2061 | |
ffe60014 DG |
2062 | void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan) |
2063 | { | |
4628484a MD |
2064 | int i; |
2065 | ||
ffe60014 DG |
2066 | assert(chan); |
2067 | assert(chan->uchan); | |
e316aad5 | 2068 | |
ea88ca2a MD |
2069 | if (chan->switch_timer_enabled == 1) { |
2070 | consumer_timer_switch_stop(chan); | |
2071 | } | |
4628484a MD |
2072 | for (i = 0; i < chan->nr_stream_fds; i++) { |
2073 | int ret; | |
2074 | ||
2075 | ret = close(chan->stream_fds[i]); | |
2076 | if (ret) { | |
2077 | PERROR("close"); | |
2078 | } | |
2079 | if (chan->shm_path[0]) { | |
2080 | char shm_path[PATH_MAX]; | |
2081 | ||
2082 | ret = get_stream_shm_path(shm_path, chan->shm_path, i); | |
2083 | if (ret) { | |
2084 | ERR("Cannot get stream shm path"); | |
2085 | } | |
2086 | ret = run_as_unlink(shm_path, chan->uid, chan->gid); | |
2087 | if (ret) { | |
4628484a MD |
2088 | PERROR("unlink %s", shm_path); |
2089 | } | |
2090 | } | |
2091 | } | |
3bd1e081 MD |
2092 | } |
2093 | ||
b83e03c4 MD |
2094 | void lttng_ustconsumer_free_channel(struct lttng_consumer_channel *chan) |
2095 | { | |
2096 | assert(chan); | |
2097 | assert(chan->uchan); | |
2098 | ||
2099 | consumer_metadata_cache_destroy(chan); | |
2100 | ustctl_destroy_channel(chan->uchan); | |
ea853771 JR |
2101 | /* Try to rmdir all directories under shm_path root. */ |
2102 | if (chan->root_shm_path[0]) { | |
2103 | (void) run_as_recursive_rmdir(chan->root_shm_path, | |
2104 | chan->uid, chan->gid); | |
2105 | } | |
b83e03c4 MD |
2106 | free(chan->stream_fds); |
2107 | } | |
2108 | ||
3bd1e081 MD |
2109 | void lttng_ustconsumer_del_stream(struct lttng_consumer_stream *stream) |
2110 | { | |
ffe60014 DG |
2111 | assert(stream); |
2112 | assert(stream->ustream); | |
d41f73b7 | 2113 | |
ea88ca2a MD |
2114 | if (stream->chan->switch_timer_enabled == 1) { |
2115 | consumer_timer_switch_stop(stream->chan); | |
2116 | } | |
ffe60014 DG |
2117 | ustctl_destroy_stream(stream->ustream); |
2118 | } | |
d41f73b7 | 2119 | |
6d574024 DG |
2120 | int lttng_ustconsumer_get_wakeup_fd(struct lttng_consumer_stream *stream) |
2121 | { | |
2122 | assert(stream); | |
2123 | assert(stream->ustream); | |
2124 | ||
2125 | return ustctl_stream_get_wakeup_fd(stream->ustream); | |
2126 | } | |
2127 | ||
2128 | int lttng_ustconsumer_close_wakeup_fd(struct lttng_consumer_stream *stream) | |
2129 | { | |
2130 | assert(stream); | |
2131 | assert(stream->ustream); | |
2132 | ||
2133 | return ustctl_stream_close_wakeup_fd(stream->ustream); | |
2134 | } | |
2135 | ||
93ec662e | 2136 | static |
29d1a7ae | 2137 | void metadata_stream_reset_cache(struct lttng_consumer_stream *stream) |
93ec662e | 2138 | { |
29d1a7ae JG |
2139 | DBG("Reset metadata cache of session %" PRIu64, |
2140 | stream->chan->session_id); | |
93ec662e | 2141 | stream->ust_metadata_pushed = 0; |
29d1a7ae | 2142 | stream->metadata_version = stream->chan->metadata_cache->version; |
93ec662e JD |
2143 | stream->reset_metadata_flag = 1; |
2144 | } | |
2145 | ||
94d49140 JD |
2146 | /* |
2147 | * Write up to one packet from the metadata cache to the channel. | |
2148 | * | |
2149 | * Returns the number of bytes pushed in the cache, or a negative value | |
2150 | * on error. | |
2151 | */ | |
2152 | static | |
2153 | int commit_one_metadata_packet(struct lttng_consumer_stream *stream) | |
2154 | { | |
2155 | ssize_t write_len; | |
2156 | int ret; | |
2157 | ||
2158 | pthread_mutex_lock(&stream->chan->metadata_cache->lock); | |
c585821b | 2159 | if (stream->chan->metadata_cache->max_offset |
94d49140 JD |
2160 | == stream->ust_metadata_pushed) { |
2161 | ret = 0; | |
2162 | goto end; | |
2163 | } | |
2164 | ||
2165 | write_len = ustctl_write_one_packet_to_channel(stream->chan->uchan, | |
2166 | &stream->chan->metadata_cache->data[stream->ust_metadata_pushed], | |
c585821b | 2167 | stream->chan->metadata_cache->max_offset |
94d49140 JD |
2168 | - stream->ust_metadata_pushed); |
2169 | assert(write_len != 0); | |
2170 | if (write_len < 0) { | |
2171 | ERR("Writing one metadata packet"); | |
2172 | ret = -1; | |
2173 | goto end; | |
2174 | } | |
2175 | stream->ust_metadata_pushed += write_len; | |
2176 | ||
c585821b | 2177 | assert(stream->chan->metadata_cache->max_offset >= |
94d49140 JD |
2178 | stream->ust_metadata_pushed); |
2179 | ret = write_len; | |
2180 | ||
29d1a7ae JG |
2181 | /* |
2182 | * Switch packet (but don't open the next one) on every commit of | |
2183 | * a metadata packet. Since the subbuffer is fully filled (with padding, | |
2184 | * if needed), the stream is "quiescent" after this commit. | |
2185 | */ | |
2186 | ustctl_flush_buffer(stream->ustream, 1); | |
94d49140 JD |
2187 | end: |
2188 | pthread_mutex_unlock(&stream->chan->metadata_cache->lock); | |
2189 | return ret; | |
2190 | } | |
2191 | ||
309167d2 | 2192 | |
94d49140 JD |
2193 | /* |
2194 | * Sync metadata meaning request them to the session daemon and snapshot to the | |
2195 | * metadata thread can consumer them. | |
2196 | * | |
c585821b MD |
2197 | * Metadata stream lock is held here, but we need to release it when |
2198 | * interacting with sessiond, else we cause a deadlock with live | |
2199 | * awaiting on metadata to be pushed out. | |
94d49140 JD |
2200 | * |
2201 | * Return 0 if new metadatda is available, EAGAIN if the metadata stream | |
2202 | * is empty or a negative value on error. | |
2203 | */ | |
2204 | int lttng_ustconsumer_sync_metadata(struct lttng_consumer_local_data *ctx, | |
2205 | struct lttng_consumer_stream *metadata) | |
2206 | { | |
2207 | int ret; | |
2208 | int retry = 0; | |
2209 | ||
2210 | assert(ctx); | |
2211 | assert(metadata); | |
2212 | ||
c585821b | 2213 | pthread_mutex_unlock(&metadata->lock); |
94d49140 JD |
2214 | /* |
2215 | * Request metadata from the sessiond, but don't wait for the flush | |
2216 | * because we locked the metadata thread. | |
2217 | */ | |
2218 | ret = lttng_ustconsumer_request_metadata(ctx, metadata->chan, 0, 0); | |
87f05398 | 2219 | pthread_mutex_lock(&metadata->lock); |
94d49140 JD |
2220 | if (ret < 0) { |
2221 | goto end; | |
2222 | } | |
2223 | ||
2224 | ret = commit_one_metadata_packet(metadata); | |
2225 | if (ret <= 0) { | |
2226 | goto end; | |
2227 | } else if (ret > 0) { | |
2228 | retry = 1; | |
2229 | } | |
2230 | ||
2231 | ustctl_flush_buffer(metadata->ustream, 1); | |
2232 | ret = ustctl_snapshot(metadata->ustream); | |
2233 | if (ret < 0) { | |
2234 | if (errno != EAGAIN) { | |
2235 | ERR("Sync metadata, taking UST snapshot"); | |
2236 | goto end; | |
2237 | } | |
2238 | DBG("No new metadata when syncing them."); | |
2239 | /* No new metadata, exit. */ | |
2240 | ret = ENODATA; | |
2241 | goto end; | |
2242 | } | |
2243 | ||
2244 | /* | |
2245 | * After this flush, we still need to extract metadata. | |
2246 | */ | |
2247 | if (retry) { | |
2248 | ret = EAGAIN; | |
2249 | } | |
2250 | ||
2251 | end: | |
2252 | return ret; | |
2253 | } | |
2254 | ||
02b3d176 DG |
2255 | /* |
2256 | * Return 0 on success else a negative value. | |
2257 | */ | |
2258 | static int notify_if_more_data(struct lttng_consumer_stream *stream, | |
2259 | struct lttng_consumer_local_data *ctx) | |
2260 | { | |
2261 | int ret; | |
2262 | struct ustctl_consumer_stream *ustream; | |
2263 | ||
2264 | assert(stream); | |
2265 | assert(ctx); | |
2266 | ||
2267 | ustream = stream->ustream; | |
2268 | ||
2269 | /* | |
2270 | * First, we are going to check if there is a new subbuffer available | |
2271 | * before reading the stream wait_fd. | |
2272 | */ | |
2273 | /* Get the next subbuffer */ | |
2274 | ret = ustctl_get_next_subbuf(ustream); | |
2275 | if (ret) { | |
2276 | /* No more data found, flag the stream. */ | |
2277 | stream->has_data = 0; | |
2278 | ret = 0; | |
2279 | goto end; | |
2280 | } | |
2281 | ||
5420e5db | 2282 | ret = ustctl_put_subbuf(ustream); |
02b3d176 DG |
2283 | assert(!ret); |
2284 | ||
2285 | /* This stream still has data. Flag it and wake up the data thread. */ | |
2286 | stream->has_data = 1; | |
2287 | ||
2288 | if (stream->monitor && !stream->hangup_flush_done && !ctx->has_wakeup) { | |
2289 | ssize_t writelen; | |
2290 | ||
2291 | writelen = lttng_pipe_write(ctx->consumer_wakeup_pipe, "!", 1); | |
2292 | if (writelen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) { | |
2293 | ret = writelen; | |
2294 | goto end; | |
2295 | } | |
2296 | ||
2297 | /* The wake up pipe has been notified. */ | |
2298 | ctx->has_wakeup = 1; | |
2299 | } | |
2300 | ret = 0; | |
2301 | ||
2302 | end: | |
2303 | return ret; | |
2304 | } | |
2305 | ||
29d1a7ae | 2306 | static int consumer_stream_ust_on_wake_up(struct lttng_consumer_stream *stream) |
fb83fe64 | 2307 | { |
29d1a7ae | 2308 | int ret = 0; |
fb83fe64 | 2309 | |
fb83fe64 | 2310 | /* |
29d1a7ae JG |
2311 | * We can consume the 1 byte written into the wait_fd by |
2312 | * UST. Don't trigger error if we cannot read this one byte | |
2313 | * (read returns 0), or if the error is EAGAIN or EWOULDBLOCK. | |
2314 | * | |
2315 | * This is only done when the stream is monitored by a thread, | |
2316 | * before the flush is done after a hangup and if the stream | |
2317 | * is not flagged with data since there might be nothing to | |
2318 | * consume in the wait fd but still have data available | |
2319 | * flagged by the consumer wake up pipe. | |
fb83fe64 | 2320 | */ |
29d1a7ae JG |
2321 | if (stream->monitor && !stream->hangup_flush_done && !stream->has_data) { |
2322 | char dummy; | |
2323 | ssize_t readlen; | |
2324 | ||
2325 | readlen = lttng_read(stream->wait_fd, &dummy, 1); | |
2326 | if (readlen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) { | |
2327 | ret = readlen; | |
2328 | } | |
fb83fe64 | 2329 | } |
fb83fe64 | 2330 | |
29d1a7ae JG |
2331 | return ret; |
2332 | } | |
2333 | ||
2334 | static int extract_common_subbuffer_info(struct lttng_consumer_stream *stream, | |
2335 | struct stream_subbuffer *subbuf) | |
2336 | { | |
2337 | int ret; | |
2338 | ||
2339 | ret = ustctl_get_subbuf_size( | |
2340 | stream->ustream, &subbuf->info.data.subbuf_size); | |
2341 | if (ret) { | |
fb83fe64 JD |
2342 | goto end; |
2343 | } | |
29d1a7ae JG |
2344 | |
2345 | ret = ustctl_get_padded_subbuf_size( | |
2346 | stream->ustream, &subbuf->info.data.padded_subbuf_size); | |
2347 | if (ret) { | |
2348 | goto end; | |
fb83fe64 | 2349 | } |
fb83fe64 JD |
2350 | |
2351 | end: | |
2352 | return ret; | |
2353 | } | |
2354 | ||
29d1a7ae JG |
2355 | static int extract_metadata_subbuffer_info(struct lttng_consumer_stream *stream, |
2356 | struct stream_subbuffer *subbuf) | |
d41f73b7 | 2357 | { |
29d1a7ae | 2358 | int ret; |
ffe60014 | 2359 | |
29d1a7ae JG |
2360 | ret = extract_common_subbuffer_info(stream, subbuf); |
2361 | if (ret) { | |
2362 | goto end; | |
2363 | } | |
d41f73b7 | 2364 | |
29d1a7ae | 2365 | subbuf->info.metadata.version = stream->chan->metadata_cache->version; |
ffe60014 | 2366 | |
29d1a7ae JG |
2367 | end: |
2368 | return ret; | |
2369 | } | |
d41f73b7 | 2370 | |
29d1a7ae JG |
2371 | static int extract_data_subbuffer_info(struct lttng_consumer_stream *stream, |
2372 | struct stream_subbuffer *subbuf) | |
2373 | { | |
2374 | int ret; | |
c617c0c6 | 2375 | |
29d1a7ae JG |
2376 | ret = extract_common_subbuffer_info(stream, subbuf); |
2377 | if (ret) { | |
2378 | goto end; | |
d41f73b7 MD |
2379 | } |
2380 | ||
29d1a7ae JG |
2381 | ret = ustctl_get_packet_size( |
2382 | stream->ustream, &subbuf->info.data.packet_size); | |
2383 | if (ret < 0) { | |
2384 | PERROR("Failed to get sub-buffer packet size"); | |
2385 | goto end; | |
2386 | } | |
04ef1097 | 2387 | |
29d1a7ae JG |
2388 | ret = ustctl_get_content_size( |
2389 | stream->ustream, &subbuf->info.data.content_size); | |
2390 | if (ret < 0) { | |
2391 | PERROR("Failed to get sub-buffer content size"); | |
d41f73b7 MD |
2392 | goto end; |
2393 | } | |
309167d2 | 2394 | |
29d1a7ae JG |
2395 | ret = ustctl_get_timestamp_begin( |
2396 | stream->ustream, &subbuf->info.data.timestamp_begin); | |
2397 | if (ret < 0) { | |
2398 | PERROR("Failed to get sub-buffer begin timestamp"); | |
2399 | goto end; | |
2400 | } | |
fb83fe64 | 2401 | |
29d1a7ae JG |
2402 | ret = ustctl_get_timestamp_end( |
2403 | stream->ustream, &subbuf->info.data.timestamp_end); | |
2404 | if (ret < 0) { | |
2405 | PERROR("Failed to get sub-buffer end timestamp"); | |
2406 | goto end; | |
2407 | } | |
2408 | ||
2409 | ret = ustctl_get_events_discarded( | |
2410 | stream->ustream, &subbuf->info.data.events_discarded); | |
2411 | if (ret) { | |
2412 | PERROR("Failed to get sub-buffer events discarded count"); | |
2413 | goto end; | |
2414 | } | |
2415 | ||
2416 | ret = ustctl_get_sequence_number(stream->ustream, | |
2417 | &subbuf->info.data.sequence_number.value); | |
2418 | if (ret) { | |
2419 | /* May not be supported by older LTTng-modules. */ | |
2420 | if (ret != -ENOTTY) { | |
2421 | PERROR("Failed to get sub-buffer sequence number"); | |
fb83fe64 JD |
2422 | goto end; |
2423 | } | |
1c20f0e2 | 2424 | } else { |
29d1a7ae | 2425 | subbuf->info.data.sequence_number.is_set = true; |
309167d2 JD |
2426 | } |
2427 | ||
29d1a7ae JG |
2428 | ret = ustctl_get_stream_id( |
2429 | stream->ustream, &subbuf->info.data.stream_id); | |
2430 | if (ret < 0) { | |
2431 | PERROR("Failed to get stream id"); | |
2432 | goto end; | |
2433 | } | |
1d4dfdef | 2434 | |
29d1a7ae JG |
2435 | ret = ustctl_get_instance_id(stream->ustream, |
2436 | &subbuf->info.data.stream_instance_id.value); | |
2437 | if (ret) { | |
2438 | /* May not be supported by older LTTng-modules. */ | |
2439 | if (ret != -ENOTTY) { | |
2440 | PERROR("Failed to get stream instance id"); | |
2441 | goto end; | |
2442 | } | |
2443 | } else { | |
2444 | subbuf->info.data.stream_instance_id.is_set = true; | |
2445 | } | |
2446 | end: | |
2447 | return ret; | |
2448 | } | |
1d4dfdef | 2449 | |
29d1a7ae JG |
2450 | static int get_next_subbuffer_common(struct lttng_consumer_stream *stream, |
2451 | struct stream_subbuffer *subbuffer) | |
2452 | { | |
2453 | int ret; | |
2454 | const char *addr; | |
1d4dfdef | 2455 | |
29d1a7ae JG |
2456 | ret = stream->read_subbuffer_ops.extract_subbuffer_info( |
2457 | stream, subbuffer); | |
2458 | if (ret) { | |
2459 | goto end; | |
2460 | } | |
1fdb9a78 | 2461 | |
29d1a7ae | 2462 | ret = get_current_subbuf_addr(stream, &addr); |
1fdb9a78 | 2463 | if (ret) { |
29d1a7ae | 2464 | goto end; |
1fdb9a78 JG |
2465 | } |
2466 | ||
29d1a7ae JG |
2467 | subbuffer->buffer.buffer = lttng_buffer_view_init( |
2468 | addr, 0, subbuffer->info.data.padded_subbuf_size); | |
2469 | assert(subbuffer->buffer.buffer.data != NULL); | |
2470 | end: | |
2471 | return ret; | |
2472 | } | |
ace0e591 | 2473 | |
29d1a7ae JG |
2474 | static int get_next_subbuffer(struct lttng_consumer_stream *stream, |
2475 | struct stream_subbuffer *subbuffer) | |
2476 | { | |
2477 | int ret; | |
331744e3 | 2478 | |
29d1a7ae JG |
2479 | ret = ustctl_get_next_subbuf(stream->ustream); |
2480 | if (ret) { | |
2481 | goto end; | |
02b3d176 DG |
2482 | } |
2483 | ||
29d1a7ae JG |
2484 | ret = get_next_subbuffer_common(stream, subbuffer); |
2485 | if (ret) { | |
1c20f0e2 JD |
2486 | goto end; |
2487 | } | |
29d1a7ae JG |
2488 | end: |
2489 | return ret; | |
2490 | } | |
1c20f0e2 | 2491 | |
29d1a7ae JG |
2492 | static int get_next_subbuffer_metadata(struct lttng_consumer_stream *stream, |
2493 | struct stream_subbuffer *subbuffer) | |
2494 | { | |
2495 | int ret; | |
2496 | ||
2497 | ret = ustctl_get_next_subbuf(stream->ustream); | |
2498 | if (ret) { | |
2499 | ret = commit_one_metadata_packet(stream); | |
2500 | if (ret < 0) { | |
2501 | goto end; | |
2502 | } else if (ret == 0) { | |
2503 | /* Not an error, the cache is empty. */ | |
2504 | ret = -ENODATA; | |
2505 | goto end; | |
c585821b MD |
2506 | } |
2507 | ||
29d1a7ae JG |
2508 | ret = ustctl_get_next_subbuf(stream->ustream); |
2509 | if (ret) { | |
94d49140 JD |
2510 | goto end; |
2511 | } | |
2512 | } | |
2513 | ||
29d1a7ae JG |
2514 | ret = get_next_subbuffer_common(stream, subbuffer); |
2515 | if (ret) { | |
1c20f0e2 | 2516 | goto end; |
309167d2 | 2517 | } |
d41f73b7 MD |
2518 | end: |
2519 | return ret; | |
2520 | } | |
2521 | ||
29d1a7ae JG |
2522 | static int put_next_subbuffer(struct lttng_consumer_stream *stream, |
2523 | struct stream_subbuffer *subbuffer) | |
2524 | { | |
2525 | const int ret = ustctl_put_next_subbuf(stream->ustream); | |
2526 | ||
2527 | assert(ret == 0); | |
2528 | return ret; | |
2529 | } | |
2530 | ||
2531 | static int signal_metadata(struct lttng_consumer_stream *stream, | |
2532 | struct lttng_consumer_local_data *ctx) | |
2533 | { | |
2534 | return pthread_cond_broadcast(&stream->metadata_rdv) ? -errno : 0; | |
2535 | } | |
2536 | ||
2537 | static void lttng_ustconsumer_set_stream_ops( | |
2538 | struct lttng_consumer_stream *stream) | |
2539 | { | |
2540 | stream->read_subbuffer_ops.on_wake_up = consumer_stream_ust_on_wake_up; | |
2541 | if (stream->metadata_flag) { | |
2542 | stream->read_subbuffer_ops.get_next_subbuffer = | |
2543 | get_next_subbuffer_metadata; | |
2544 | stream->read_subbuffer_ops.extract_subbuffer_info = | |
2545 | extract_metadata_subbuffer_info; | |
2546 | stream->read_subbuffer_ops.reset_metadata = | |
2547 | metadata_stream_reset_cache; | |
2548 | stream->read_subbuffer_ops.on_sleep = signal_metadata; | |
2549 | } else { | |
2550 | stream->read_subbuffer_ops.get_next_subbuffer = | |
2551 | get_next_subbuffer; | |
2552 | stream->read_subbuffer_ops.extract_subbuffer_info = | |
2553 | extract_data_subbuffer_info; | |
2554 | stream->read_subbuffer_ops.on_sleep = notify_if_more_data; | |
2555 | if (stream->chan->is_live) { | |
2556 | stream->read_subbuffer_ops.send_live_beacon = | |
2557 | consumer_flush_ust_index; | |
2558 | } | |
2559 | } | |
2560 | ||
2561 | stream->read_subbuffer_ops.put_next_subbuffer = put_next_subbuffer; | |
2562 | } | |
2563 | ||
ffe60014 DG |
2564 | /* |
2565 | * Called when a stream is created. | |
fe4477ee JD |
2566 | * |
2567 | * Return 0 on success or else a negative value. | |
ffe60014 | 2568 | */ |
d41f73b7 MD |
2569 | int lttng_ustconsumer_on_recv_stream(struct lttng_consumer_stream *stream) |
2570 | { | |
fe4477ee JD |
2571 | int ret; |
2572 | ||
10a50311 JD |
2573 | assert(stream); |
2574 | ||
fe4477ee | 2575 | /* Don't create anything if this is set for streaming. */ |
6d40f8fa | 2576 | if (stream->relayd_id == (uint64_t) -1ULL && stream->chan->monitor) { |
fe4477ee JD |
2577 | ret = utils_create_stream_file(stream->chan->pathname, stream->name, |
2578 | stream->chan->tracefile_size, stream->tracefile_count_current, | |
309167d2 | 2579 | stream->uid, stream->gid, NULL); |
fe4477ee JD |
2580 | if (ret < 0) { |
2581 | goto error; | |
2582 | } | |
2583 | stream->out_fd = ret; | |
2584 | stream->tracefile_size_current = 0; | |
309167d2 JD |
2585 | |
2586 | if (!stream->metadata_flag) { | |
e0547b83 MD |
2587 | struct lttng_index_file *index_file; |
2588 | ||
2589 | index_file = lttng_index_file_create(stream->chan->pathname, | |
309167d2 JD |
2590 | stream->name, stream->uid, stream->gid, |
2591 | stream->chan->tracefile_size, | |
e0547b83 MD |
2592 | stream->tracefile_count_current, |
2593 | CTF_INDEX_MAJOR, CTF_INDEX_MINOR); | |
2594 | if (!index_file) { | |
309167d2 JD |
2595 | goto error; |
2596 | } | |
e0547b83 | 2597 | stream->index_file = index_file; |
309167d2 | 2598 | } |
fe4477ee | 2599 | } |
29d1a7ae JG |
2600 | |
2601 | lttng_ustconsumer_set_stream_ops(stream); | |
fe4477ee JD |
2602 | ret = 0; |
2603 | ||
2604 | error: | |
2605 | return ret; | |
d41f73b7 | 2606 | } |
ca22feea DG |
2607 | |
2608 | /* | |
2609 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
2610 | * stream. Consumer data lock MUST be acquired before calling this function |
2611 | * and the stream lock. | |
ca22feea | 2612 | * |
6d805429 | 2613 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
2614 | * data is available for trace viewer reading. |
2615 | */ | |
6d805429 | 2616 | int lttng_ustconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
2617 | { |
2618 | int ret; | |
2619 | ||
2620 | assert(stream); | |
ffe60014 | 2621 | assert(stream->ustream); |
ca22feea | 2622 | |
6d805429 | 2623 | DBG("UST consumer checking data pending"); |
c8f59ee5 | 2624 | |
ca6b395f MD |
2625 | if (stream->endpoint_status != CONSUMER_ENDPOINT_ACTIVE) { |
2626 | ret = 0; | |
2627 | goto end; | |
2628 | } | |
2629 | ||
04ef1097 | 2630 | if (stream->chan->type == CONSUMER_CHANNEL_TYPE_METADATA) { |
e6ee4eab DG |
2631 | uint64_t contiguous, pushed; |
2632 | ||
2633 | /* Ease our life a bit. */ | |
c585821b | 2634 | contiguous = stream->chan->metadata_cache->max_offset; |
e6ee4eab DG |
2635 | pushed = stream->ust_metadata_pushed; |
2636 | ||
04ef1097 MD |
2637 | /* |
2638 | * We can simply check whether all contiguously available data | |
2639 | * has been pushed to the ring buffer, since the push operation | |
2640 | * is performed within get_next_subbuf(), and because both | |
2641 | * get_next_subbuf() and put_next_subbuf() are issued atomically | |
2642 | * thanks to the stream lock within | |
2643 | * lttng_ustconsumer_read_subbuffer(). This basically means that | |
2644 | * whetnever ust_metadata_pushed is incremented, the associated | |
2645 | * metadata has been consumed from the metadata stream. | |
2646 | */ | |
2647 | DBG("UST consumer metadata pending check: contiguous %" PRIu64 " vs pushed %" PRIu64, | |
e6ee4eab | 2648 | contiguous, pushed); |
aa01b94c | 2649 | assert(((int64_t) (contiguous - pushed)) >= 0); |
e6ee4eab | 2650 | if ((contiguous != pushed) || |
6acdf328 | 2651 | (((int64_t) contiguous - pushed) > 0 || contiguous == 0)) { |
04ef1097 MD |
2652 | ret = 1; /* Data is pending */ |
2653 | goto end; | |
2654 | } | |
2655 | } else { | |
2656 | ret = ustctl_get_next_subbuf(stream->ustream); | |
2657 | if (ret == 0) { | |
2658 | /* | |
2659 | * There is still data so let's put back this | |
2660 | * subbuffer. | |
2661 | */ | |
2662 | ret = ustctl_put_subbuf(stream->ustream); | |
2663 | assert(ret == 0); | |
2664 | ret = 1; /* Data is pending */ | |
2665 | goto end; | |
2666 | } | |
ca22feea DG |
2667 | } |
2668 | ||
6d805429 DG |
2669 | /* Data is NOT pending so ready to be read. */ |
2670 | ret = 0; | |
ca22feea | 2671 | |
6efae65e DG |
2672 | end: |
2673 | return ret; | |
ca22feea | 2674 | } |
d88aee68 | 2675 | |
6d574024 DG |
2676 | /* |
2677 | * Stop a given metadata channel timer if enabled and close the wait fd which | |
2678 | * is the poll pipe of the metadata stream. | |
2679 | * | |
2680 | * This MUST be called with the metadata channel acquired. | |
2681 | */ | |
2682 | void lttng_ustconsumer_close_metadata(struct lttng_consumer_channel *metadata) | |
2683 | { | |
2684 | int ret; | |
2685 | ||
2686 | assert(metadata); | |
2687 | assert(metadata->type == CONSUMER_CHANNEL_TYPE_METADATA); | |
2688 | ||
2689 | DBG("Closing metadata channel key %" PRIu64, metadata->key); | |
2690 | ||
2691 | if (metadata->switch_timer_enabled == 1) { | |
2692 | consumer_timer_switch_stop(metadata); | |
2693 | } | |
2694 | ||
2695 | if (!metadata->metadata_stream) { | |
2696 | goto end; | |
2697 | } | |
2698 | ||
2699 | /* | |
2700 | * Closing write side so the thread monitoring the stream wakes up if any | |
2701 | * and clean the metadata stream. | |
2702 | */ | |
2703 | if (metadata->metadata_stream->ust_metadata_poll_pipe[1] >= 0) { | |
2704 | ret = close(metadata->metadata_stream->ust_metadata_poll_pipe[1]); | |
2705 | if (ret < 0) { | |
2706 | PERROR("closing metadata pipe write side"); | |
2707 | } | |
2708 | metadata->metadata_stream->ust_metadata_poll_pipe[1] = -1; | |
2709 | } | |
2710 | ||
2711 | end: | |
2712 | return; | |
2713 | } | |
2714 | ||
d88aee68 DG |
2715 | /* |
2716 | * Close every metadata stream wait fd of the metadata hash table. This | |
2717 | * function MUST be used very carefully so not to run into a race between the | |
2718 | * metadata thread handling streams and this function closing their wait fd. | |
2719 | * | |
2720 | * For UST, this is used when the session daemon hangs up. Its the metadata | |
2721 | * producer so calling this is safe because we are assured that no state change | |
2722 | * can occur in the metadata thread for the streams in the hash table. | |
2723 | */ | |
6d574024 | 2724 | void lttng_ustconsumer_close_all_metadata(struct lttng_ht *metadata_ht) |
d88aee68 | 2725 | { |
d88aee68 DG |
2726 | struct lttng_ht_iter iter; |
2727 | struct lttng_consumer_stream *stream; | |
2728 | ||
2729 | assert(metadata_ht); | |
2730 | assert(metadata_ht->ht); | |
2731 | ||
2732 | DBG("UST consumer closing all metadata streams"); | |
2733 | ||
2734 | rcu_read_lock(); | |
2735 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, | |
2736 | node.node) { | |
9ce5646a MD |
2737 | |
2738 | health_code_update(); | |
2739 | ||
be2b50c7 | 2740 | pthread_mutex_lock(&stream->chan->lock); |
6d574024 | 2741 | lttng_ustconsumer_close_metadata(stream->chan); |
be2b50c7 DG |
2742 | pthread_mutex_unlock(&stream->chan->lock); |
2743 | ||
d88aee68 DG |
2744 | } |
2745 | rcu_read_unlock(); | |
2746 | } | |
d8ef542d MD |
2747 | |
2748 | void lttng_ustconsumer_close_stream_wakeup(struct lttng_consumer_stream *stream) | |
2749 | { | |
2750 | int ret; | |
2751 | ||
2752 | ret = ustctl_stream_close_wakeup_fd(stream->ustream); | |
2753 | if (ret < 0) { | |
2754 | ERR("Unable to close wakeup fd"); | |
2755 | } | |
2756 | } | |
331744e3 | 2757 | |
f666ae70 MD |
2758 | /* |
2759 | * Please refer to consumer-timer.c before adding any lock within this | |
2760 | * function or any of its callees. Timers have a very strict locking | |
2761 | * semantic with respect to teardown. Failure to respect this semantic | |
2762 | * introduces deadlocks. | |
c585821b MD |
2763 | * |
2764 | * DON'T hold the metadata lock when calling this function, else this | |
2765 | * can cause deadlock involving consumer awaiting for metadata to be | |
2766 | * pushed out due to concurrent interaction with the session daemon. | |
f666ae70 | 2767 | */ |
331744e3 | 2768 | int lttng_ustconsumer_request_metadata(struct lttng_consumer_local_data *ctx, |
94d49140 | 2769 | struct lttng_consumer_channel *channel, int timer, int wait) |
331744e3 JD |
2770 | { |
2771 | struct lttcomm_metadata_request_msg request; | |
2772 | struct lttcomm_consumer_msg msg; | |
0c759fc9 | 2773 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
93ec662e | 2774 | uint64_t len, key, offset, version; |
331744e3 JD |
2775 | int ret; |
2776 | ||
2777 | assert(channel); | |
2778 | assert(channel->metadata_cache); | |
2779 | ||
53efb85a MD |
2780 | memset(&request, 0, sizeof(request)); |
2781 | ||
331744e3 JD |
2782 | /* send the metadata request to sessiond */ |
2783 | switch (consumer_data.type) { | |
2784 | case LTTNG_CONSUMER64_UST: | |
2785 | request.bits_per_long = 64; | |
2786 | break; | |
2787 | case LTTNG_CONSUMER32_UST: | |
2788 | request.bits_per_long = 32; | |
2789 | break; | |
2790 | default: | |
2791 | request.bits_per_long = 0; | |
2792 | break; | |
2793 | } | |
2794 | ||
2795 | request.session_id = channel->session_id; | |
1950109e | 2796 | request.session_id_per_pid = channel->session_id_per_pid; |
567eb353 DG |
2797 | /* |
2798 | * Request the application UID here so the metadata of that application can | |
2799 | * be sent back. The channel UID corresponds to the user UID of the session | |
2800 | * used for the rights on the stream file(s). | |
2801 | */ | |
2802 | request.uid = channel->ust_app_uid; | |
331744e3 | 2803 | request.key = channel->key; |
567eb353 | 2804 | |
1950109e | 2805 | DBG("Sending metadata request to sessiond, session id %" PRIu64 |
cc84d37b | 2806 | ", per-pid %" PRIu64 ", app UID %u and channel key %" PRIu64, |
567eb353 DG |
2807 | request.session_id, request.session_id_per_pid, request.uid, |
2808 | request.key); | |
331744e3 | 2809 | |
75d83e50 | 2810 | pthread_mutex_lock(&ctx->metadata_socket_lock); |
9ce5646a MD |
2811 | |
2812 | health_code_update(); | |
2813 | ||
331744e3 JD |
2814 | ret = lttcomm_send_unix_sock(ctx->consumer_metadata_socket, &request, |
2815 | sizeof(request)); | |
2816 | if (ret < 0) { | |
2817 | ERR("Asking metadata to sessiond"); | |
2818 | goto end; | |
2819 | } | |
2820 | ||
9ce5646a MD |
2821 | health_code_update(); |
2822 | ||
331744e3 JD |
2823 | /* Receive the metadata from sessiond */ |
2824 | ret = lttcomm_recv_unix_sock(ctx->consumer_metadata_socket, &msg, | |
2825 | sizeof(msg)); | |
2826 | if (ret != sizeof(msg)) { | |
8fd623e0 | 2827 | DBG("Consumer received unexpected message size %d (expects %zu)", |
331744e3 JD |
2828 | ret, sizeof(msg)); |
2829 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); | |
2830 | /* | |
2831 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
2832 | * since the caller handles this. | |
2833 | */ | |
2834 | goto end; | |
2835 | } | |
2836 | ||
9ce5646a MD |
2837 | health_code_update(); |
2838 | ||
331744e3 JD |
2839 | if (msg.cmd_type == LTTNG_ERR_UND) { |
2840 | /* No registry found */ | |
2841 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, | |
2842 | ret_code); | |
2843 | ret = 0; | |
2844 | goto end; | |
2845 | } else if (msg.cmd_type != LTTNG_CONSUMER_PUSH_METADATA) { | |
2846 | ERR("Unexpected cmd_type received %d", msg.cmd_type); | |
2847 | ret = -1; | |
2848 | goto end; | |
2849 | } | |
2850 | ||
2851 | len = msg.u.push_metadata.len; | |
2852 | key = msg.u.push_metadata.key; | |
2853 | offset = msg.u.push_metadata.target_offset; | |
93ec662e | 2854 | version = msg.u.push_metadata.version; |
331744e3 JD |
2855 | |
2856 | assert(key == channel->key); | |
2857 | if (len == 0) { | |
2858 | DBG("No new metadata to receive for key %" PRIu64, key); | |
2859 | } | |
2860 | ||
9ce5646a MD |
2861 | health_code_update(); |
2862 | ||
331744e3 JD |
2863 | /* Tell session daemon we are ready to receive the metadata. */ |
2864 | ret = consumer_send_status_msg(ctx->consumer_metadata_socket, | |
0c759fc9 | 2865 | LTTCOMM_CONSUMERD_SUCCESS); |
331744e3 JD |
2866 | if (ret < 0 || len == 0) { |
2867 | /* | |
2868 | * Somehow, the session daemon is not responding anymore or there is | |
2869 | * nothing to receive. | |
2870 | */ | |
2871 | goto end; | |
2872 | } | |
2873 | ||
9ce5646a MD |
2874 | health_code_update(); |
2875 | ||
1eb682be | 2876 | ret = lttng_ustconsumer_recv_metadata(ctx->consumer_metadata_socket, |
93ec662e | 2877 | key, offset, len, version, channel, timer, wait); |
1eb682be | 2878 | if (ret >= 0) { |
f2a444f1 DG |
2879 | /* |
2880 | * Only send the status msg if the sessiond is alive meaning a positive | |
2881 | * ret code. | |
2882 | */ | |
1eb682be | 2883 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, ret); |
f2a444f1 | 2884 | } |
331744e3 JD |
2885 | ret = 0; |
2886 | ||
2887 | end: | |
9ce5646a MD |
2888 | health_code_update(); |
2889 | ||
75d83e50 | 2890 | pthread_mutex_unlock(&ctx->metadata_socket_lock); |
331744e3 JD |
2891 | return ret; |
2892 | } | |
70190e1c DG |
2893 | |
2894 | /* | |
2895 | * Return the ustctl call for the get stream id. | |
2896 | */ | |
2897 | int lttng_ustconsumer_get_stream_id(struct lttng_consumer_stream *stream, | |
2898 | uint64_t *stream_id) | |
2899 | { | |
2900 | assert(stream); | |
2901 | assert(stream_id); | |
2902 | ||
2903 | return ustctl_get_stream_id(stream->ustream, stream_id); | |
2904 | } |