Commit | Line | Data |
---|---|---|
3bd1e081 MD |
1 | /* |
2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> | |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
b3530820 | 4 | * Copyright (C) 2017 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
3bd1e081 | 5 | * |
d14d33bf AM |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License, version 2 only, | |
8 | * as published by the Free Software Foundation. | |
3bd1e081 MD |
9 | * |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
d14d33bf AM |
15 | * You should have received a copy of the GNU General Public License along |
16 | * with this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
3bd1e081 MD |
18 | */ |
19 | ||
6c1c0768 | 20 | #define _LGPL_SOURCE |
3bd1e081 | 21 | #include <assert.h> |
f02e1e8a | 22 | #include <lttng/ust-ctl.h> |
3bd1e081 MD |
23 | #include <poll.h> |
24 | #include <pthread.h> | |
25 | #include <stdlib.h> | |
26 | #include <string.h> | |
27 | #include <sys/mman.h> | |
28 | #include <sys/socket.h> | |
dbb5dfe6 | 29 | #include <sys/stat.h> |
3bd1e081 | 30 | #include <sys/types.h> |
77c7c900 | 31 | #include <inttypes.h> |
3bd1e081 | 32 | #include <unistd.h> |
ffe60014 | 33 | #include <urcu/list.h> |
331744e3 | 34 | #include <signal.h> |
0857097f | 35 | |
51a9e1c7 | 36 | #include <bin/lttng-consumerd/health-consumerd.h> |
990570ed | 37 | #include <common/common.h> |
10a8a223 | 38 | #include <common/sessiond-comm/sessiond-comm.h> |
00e2e675 | 39 | #include <common/relayd/relayd.h> |
dbb5dfe6 | 40 | #include <common/compat/fcntl.h> |
f263b7fd | 41 | #include <common/compat/endian.h> |
c8fea79c JR |
42 | #include <common/consumer/consumer-metadata-cache.h> |
43 | #include <common/consumer/consumer-stream.h> | |
44 | #include <common/consumer/consumer-timer.h> | |
fe4477ee | 45 | #include <common/utils.h> |
309167d2 | 46 | #include <common/index/index.h> |
10a8a223 DG |
47 | |
48 | #include "ust-consumer.h" | |
3bd1e081 | 49 | |
45863397 | 50 | #define INT_MAX_STR_LEN 12 /* includes \0 */ |
4628484a | 51 | |
3bd1e081 MD |
52 | extern struct lttng_consumer_global_data consumer_data; |
53 | extern int consumer_poll_timeout; | |
3bd1e081 MD |
54 | |
55 | /* | |
ffe60014 DG |
56 | * Free channel object and all streams associated with it. This MUST be used |
57 | * only and only if the channel has _NEVER_ been added to the global channel | |
58 | * hash table. | |
3bd1e081 | 59 | */ |
ffe60014 | 60 | static void destroy_channel(struct lttng_consumer_channel *channel) |
3bd1e081 | 61 | { |
ffe60014 DG |
62 | struct lttng_consumer_stream *stream, *stmp; |
63 | ||
64 | assert(channel); | |
65 | ||
66 | DBG("UST consumer cleaning stream list"); | |
67 | ||
68 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
69 | send_node) { | |
9ce5646a MD |
70 | |
71 | health_code_update(); | |
72 | ||
ffe60014 DG |
73 | cds_list_del(&stream->send_node); |
74 | ustctl_destroy_stream(stream->ustream); | |
75 | free(stream); | |
76 | } | |
77 | ||
78 | /* | |
79 | * If a channel is available meaning that was created before the streams | |
80 | * were, delete it. | |
81 | */ | |
82 | if (channel->uchan) { | |
83 | lttng_ustconsumer_del_channel(channel); | |
b83e03c4 | 84 | lttng_ustconsumer_free_channel(channel); |
ffe60014 DG |
85 | } |
86 | free(channel); | |
87 | } | |
3bd1e081 MD |
88 | |
89 | /* | |
ffe60014 | 90 | * Add channel to internal consumer state. |
3bd1e081 | 91 | * |
ffe60014 | 92 | * Returns 0 on success or else a negative value. |
3bd1e081 | 93 | */ |
ffe60014 DG |
94 | static int add_channel(struct lttng_consumer_channel *channel, |
95 | struct lttng_consumer_local_data *ctx) | |
3bd1e081 MD |
96 | { |
97 | int ret = 0; | |
98 | ||
ffe60014 DG |
99 | assert(channel); |
100 | assert(ctx); | |
101 | ||
102 | if (ctx->on_recv_channel != NULL) { | |
103 | ret = ctx->on_recv_channel(channel); | |
104 | if (ret == 0) { | |
d8ef542d | 105 | ret = consumer_add_channel(channel, ctx); |
ffe60014 DG |
106 | } else if (ret < 0) { |
107 | /* Most likely an ENOMEM. */ | |
108 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
109 | goto error; | |
110 | } | |
111 | } else { | |
d8ef542d | 112 | ret = consumer_add_channel(channel, ctx); |
3bd1e081 MD |
113 | } |
114 | ||
d88aee68 | 115 | DBG("UST consumer channel added (key: %" PRIu64 ")", channel->key); |
ffe60014 DG |
116 | |
117 | error: | |
3bd1e081 MD |
118 | return ret; |
119 | } | |
120 | ||
121 | /* | |
ffe60014 DG |
122 | * Allocate and return a consumer channel object. |
123 | */ | |
124 | static struct lttng_consumer_channel *allocate_channel(uint64_t session_id, | |
125 | const char *pathname, const char *name, uid_t uid, gid_t gid, | |
da009f2c | 126 | uint64_t relayd_id, uint64_t key, enum lttng_event_output output, |
2bba9e53 | 127 | uint64_t tracefile_size, uint64_t tracefile_count, |
ecc48a90 | 128 | uint64_t session_id_per_pid, unsigned int monitor, |
d7ba1388 | 129 | unsigned int live_timer_interval, |
3d071855 | 130 | const char *root_shm_path, const char *shm_path) |
ffe60014 DG |
131 | { |
132 | assert(pathname); | |
133 | assert(name); | |
134 | ||
1950109e JD |
135 | return consumer_allocate_channel(key, session_id, pathname, name, uid, |
136 | gid, relayd_id, output, tracefile_size, | |
d7ba1388 | 137 | tracefile_count, session_id_per_pid, monitor, |
3d071855 | 138 | live_timer_interval, root_shm_path, shm_path); |
ffe60014 DG |
139 | } |
140 | ||
141 | /* | |
142 | * Allocate and return a consumer stream object. If _alloc_ret is not NULL, the | |
143 | * error value if applicable is set in it else it is kept untouched. | |
3bd1e081 | 144 | * |
ffe60014 | 145 | * Return NULL on error else the newly allocated stream object. |
3bd1e081 | 146 | */ |
ffe60014 DG |
147 | static struct lttng_consumer_stream *allocate_stream(int cpu, int key, |
148 | struct lttng_consumer_channel *channel, | |
149 | struct lttng_consumer_local_data *ctx, int *_alloc_ret) | |
150 | { | |
151 | int alloc_ret; | |
152 | struct lttng_consumer_stream *stream = NULL; | |
153 | ||
154 | assert(channel); | |
155 | assert(ctx); | |
156 | ||
157 | stream = consumer_allocate_stream(channel->key, | |
158 | key, | |
159 | LTTNG_CONSUMER_ACTIVE_STREAM, | |
160 | channel->name, | |
161 | channel->uid, | |
162 | channel->gid, | |
163 | channel->relayd_id, | |
164 | channel->session_id, | |
165 | cpu, | |
166 | &alloc_ret, | |
4891ece8 DG |
167 | channel->type, |
168 | channel->monitor); | |
ffe60014 DG |
169 | if (stream == NULL) { |
170 | switch (alloc_ret) { | |
171 | case -ENOENT: | |
172 | /* | |
173 | * We could not find the channel. Can happen if cpu hotplug | |
174 | * happens while tearing down. | |
175 | */ | |
176 | DBG3("Could not find channel"); | |
177 | break; | |
178 | case -ENOMEM: | |
179 | case -EINVAL: | |
180 | default: | |
181 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
182 | break; | |
183 | } | |
184 | goto error; | |
185 | } | |
186 | ||
d9a2e16e | 187 | consumer_stream_update_channel_attributes(stream, channel); |
ffe60014 DG |
188 | stream->chan = channel; |
189 | ||
190 | error: | |
191 | if (_alloc_ret) { | |
192 | *_alloc_ret = alloc_ret; | |
193 | } | |
194 | return stream; | |
195 | } | |
196 | ||
197 | /* | |
198 | * Send the given stream pointer to the corresponding thread. | |
199 | * | |
200 | * Returns 0 on success else a negative value. | |
201 | */ | |
202 | static int send_stream_to_thread(struct lttng_consumer_stream *stream, | |
203 | struct lttng_consumer_local_data *ctx) | |
204 | { | |
dae10966 DG |
205 | int ret; |
206 | struct lttng_pipe *stream_pipe; | |
ffe60014 DG |
207 | |
208 | /* Get the right pipe where the stream will be sent. */ | |
209 | if (stream->metadata_flag) { | |
66d583dc | 210 | consumer_add_metadata_stream(stream); |
dae10966 | 211 | stream_pipe = ctx->consumer_metadata_pipe; |
ffe60014 | 212 | } else { |
66d583dc | 213 | consumer_add_data_stream(stream); |
dae10966 | 214 | stream_pipe = ctx->consumer_data_pipe; |
ffe60014 DG |
215 | } |
216 | ||
5ab66908 MD |
217 | /* |
218 | * From this point on, the stream's ownership has been moved away from | |
a8086cf4 JR |
219 | * the channel and it becomes globally visible. Hence, remove it from |
220 | * the local stream list to prevent the stream from being both local and | |
221 | * global. | |
5ab66908 MD |
222 | */ |
223 | stream->globally_visible = 1; | |
a8086cf4 | 224 | cds_list_del(&stream->send_node); |
5ab66908 | 225 | |
dae10966 | 226 | ret = lttng_pipe_write(stream_pipe, &stream, sizeof(stream)); |
ffe60014 | 227 | if (ret < 0) { |
dae10966 DG |
228 | ERR("Consumer write %s stream to pipe %d", |
229 | stream->metadata_flag ? "metadata" : "data", | |
230 | lttng_pipe_get_writefd(stream_pipe)); | |
5ab66908 MD |
231 | if (stream->metadata_flag) { |
232 | consumer_del_stream_for_metadata(stream); | |
233 | } else { | |
234 | consumer_del_stream_for_data(stream); | |
235 | } | |
a8086cf4 | 236 | goto error; |
ffe60014 | 237 | } |
a8086cf4 | 238 | |
5ab66908 | 239 | error: |
ffe60014 DG |
240 | return ret; |
241 | } | |
242 | ||
4628484a MD |
243 | static |
244 | int get_stream_shm_path(char *stream_shm_path, const char *shm_path, int cpu) | |
245 | { | |
45863397 | 246 | char cpu_nr[INT_MAX_STR_LEN]; /* int max len */ |
4628484a MD |
247 | int ret; |
248 | ||
249 | strncpy(stream_shm_path, shm_path, PATH_MAX); | |
250 | stream_shm_path[PATH_MAX - 1] = '\0'; | |
45863397 | 251 | ret = snprintf(cpu_nr, INT_MAX_STR_LEN, "%i", cpu); |
67f8cb8d MD |
252 | if (ret < 0) { |
253 | PERROR("snprintf"); | |
4628484a MD |
254 | goto end; |
255 | } | |
256 | strncat(stream_shm_path, cpu_nr, | |
257 | PATH_MAX - strlen(stream_shm_path) - 1); | |
258 | ret = 0; | |
259 | end: | |
260 | return ret; | |
261 | } | |
262 | ||
d88aee68 DG |
263 | /* |
264 | * Create streams for the given channel using liblttng-ust-ctl. | |
265 | * | |
266 | * Return 0 on success else a negative value. | |
267 | */ | |
ffe60014 DG |
268 | static int create_ust_streams(struct lttng_consumer_channel *channel, |
269 | struct lttng_consumer_local_data *ctx) | |
270 | { | |
271 | int ret, cpu = 0; | |
272 | struct ustctl_consumer_stream *ustream; | |
273 | struct lttng_consumer_stream *stream; | |
274 | ||
275 | assert(channel); | |
276 | assert(ctx); | |
277 | ||
278 | /* | |
279 | * While a stream is available from ustctl. When NULL is returned, we've | |
280 | * reached the end of the possible stream for the channel. | |
281 | */ | |
282 | while ((ustream = ustctl_create_stream(channel->uchan, cpu))) { | |
283 | int wait_fd; | |
04ef1097 | 284 | int ust_metadata_pipe[2]; |
ffe60014 | 285 | |
9ce5646a MD |
286 | health_code_update(); |
287 | ||
04ef1097 MD |
288 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && channel->monitor) { |
289 | ret = utils_create_pipe_cloexec_nonblock(ust_metadata_pipe); | |
290 | if (ret < 0) { | |
291 | ERR("Create ust metadata poll pipe"); | |
292 | goto error; | |
293 | } | |
294 | wait_fd = ust_metadata_pipe[0]; | |
295 | } else { | |
296 | wait_fd = ustctl_stream_get_wait_fd(ustream); | |
297 | } | |
ffe60014 DG |
298 | |
299 | /* Allocate consumer stream object. */ | |
300 | stream = allocate_stream(cpu, wait_fd, channel, ctx, &ret); | |
301 | if (!stream) { | |
302 | goto error_alloc; | |
303 | } | |
304 | stream->ustream = ustream; | |
305 | /* | |
306 | * Store it so we can save multiple function calls afterwards since | |
307 | * this value is used heavily in the stream threads. This is UST | |
308 | * specific so this is why it's done after allocation. | |
309 | */ | |
310 | stream->wait_fd = wait_fd; | |
311 | ||
b31398bb DG |
312 | /* |
313 | * Increment channel refcount since the channel reference has now been | |
314 | * assigned in the allocation process above. | |
315 | */ | |
10a50311 JD |
316 | if (stream->chan->monitor) { |
317 | uatomic_inc(&stream->chan->refcount); | |
318 | } | |
b31398bb | 319 | |
ffe60014 DG |
320 | /* |
321 | * Order is important this is why a list is used. On error, the caller | |
322 | * should clean this list. | |
323 | */ | |
324 | cds_list_add_tail(&stream->send_node, &channel->streams.head); | |
325 | ||
326 | ret = ustctl_get_max_subbuf_size(stream->ustream, | |
327 | &stream->max_sb_size); | |
328 | if (ret < 0) { | |
329 | ERR("ustctl_get_max_subbuf_size failed for stream %s", | |
330 | stream->name); | |
331 | goto error; | |
332 | } | |
333 | ||
334 | /* Do actions once stream has been received. */ | |
335 | if (ctx->on_recv_stream) { | |
336 | ret = ctx->on_recv_stream(stream); | |
337 | if (ret < 0) { | |
338 | goto error; | |
339 | } | |
340 | } | |
341 | ||
d88aee68 | 342 | DBG("UST consumer add stream %s (key: %" PRIu64 ") with relayd id %" PRIu64, |
ffe60014 DG |
343 | stream->name, stream->key, stream->relayd_stream_id); |
344 | ||
345 | /* Set next CPU stream. */ | |
346 | channel->streams.count = ++cpu; | |
d88aee68 DG |
347 | |
348 | /* Keep stream reference when creating metadata. */ | |
349 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) { | |
350 | channel->metadata_stream = stream; | |
8de4f941 JG |
351 | if (channel->monitor) { |
352 | /* Set metadata poll pipe if we created one */ | |
353 | memcpy(stream->ust_metadata_poll_pipe, | |
354 | ust_metadata_pipe, | |
355 | sizeof(ust_metadata_pipe)); | |
356 | } | |
d88aee68 | 357 | } |
ffe60014 DG |
358 | } |
359 | ||
360 | return 0; | |
361 | ||
362 | error: | |
363 | error_alloc: | |
364 | return ret; | |
365 | } | |
366 | ||
4628484a MD |
367 | /* |
368 | * create_posix_shm is never called concurrently within a process. | |
369 | */ | |
370 | static | |
371 | int create_posix_shm(void) | |
372 | { | |
373 | char tmp_name[NAME_MAX]; | |
374 | int shmfd, ret; | |
375 | ||
376 | ret = snprintf(tmp_name, NAME_MAX, "/ust-shm-consumer-%d", getpid()); | |
377 | if (ret < 0) { | |
378 | PERROR("snprintf"); | |
379 | return -1; | |
380 | } | |
381 | /* | |
382 | * Allocate shm, and immediately unlink its shm oject, keeping | |
383 | * only the file descriptor as a reference to the object. | |
384 | * We specifically do _not_ use the / at the beginning of the | |
385 | * pathname so that some OS implementations can keep it local to | |
386 | * the process (POSIX leaves this implementation-defined). | |
387 | */ | |
388 | shmfd = shm_open(tmp_name, O_CREAT | O_EXCL | O_RDWR, 0700); | |
389 | if (shmfd < 0) { | |
390 | PERROR("shm_open"); | |
391 | goto error_shm_open; | |
392 | } | |
393 | ret = shm_unlink(tmp_name); | |
394 | if (ret < 0 && errno != ENOENT) { | |
395 | PERROR("shm_unlink"); | |
396 | goto error_shm_release; | |
397 | } | |
398 | return shmfd; | |
399 | ||
400 | error_shm_release: | |
401 | ret = close(shmfd); | |
402 | if (ret) { | |
403 | PERROR("close"); | |
404 | } | |
405 | error_shm_open: | |
406 | return -1; | |
407 | } | |
408 | ||
409 | static int open_ust_stream_fd(struct lttng_consumer_channel *channel, | |
410 | struct ustctl_consumer_channel_attr *attr, | |
411 | int cpu) | |
412 | { | |
413 | char shm_path[PATH_MAX]; | |
414 | int ret; | |
415 | ||
416 | if (!channel->shm_path[0]) { | |
417 | return create_posix_shm(); | |
418 | } | |
419 | ret = get_stream_shm_path(shm_path, channel->shm_path, cpu); | |
420 | if (ret) { | |
421 | goto error_shm_path; | |
422 | } | |
423 | return run_as_open(shm_path, | |
424 | O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR, | |
425 | channel->uid, channel->gid); | |
426 | ||
427 | error_shm_path: | |
428 | return -1; | |
429 | } | |
430 | ||
ffe60014 DG |
431 | /* |
432 | * Create an UST channel with the given attributes and send it to the session | |
433 | * daemon using the ust ctl API. | |
434 | * | |
435 | * Return 0 on success or else a negative value. | |
436 | */ | |
4628484a MD |
437 | static int create_ust_channel(struct lttng_consumer_channel *channel, |
438 | struct ustctl_consumer_channel_attr *attr, | |
439 | struct ustctl_consumer_channel **ust_chanp) | |
ffe60014 | 440 | { |
4628484a MD |
441 | int ret, nr_stream_fds, i, j; |
442 | int *stream_fds; | |
443 | struct ustctl_consumer_channel *ust_channel; | |
ffe60014 | 444 | |
4628484a | 445 | assert(channel); |
ffe60014 | 446 | assert(attr); |
4628484a | 447 | assert(ust_chanp); |
ffe60014 DG |
448 | |
449 | DBG3("Creating channel to ustctl with attr: [overwrite: %d, " | |
450 | "subbuf_size: %" PRIu64 ", num_subbuf: %" PRIu64 ", " | |
451 | "switch_timer_interval: %u, read_timer_interval: %u, " | |
452 | "output: %d, type: %d", attr->overwrite, attr->subbuf_size, | |
453 | attr->num_subbuf, attr->switch_timer_interval, | |
454 | attr->read_timer_interval, attr->output, attr->type); | |
455 | ||
4628484a MD |
456 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) |
457 | nr_stream_fds = 1; | |
458 | else | |
459 | nr_stream_fds = ustctl_get_nr_stream_per_channel(); | |
460 | stream_fds = zmalloc(nr_stream_fds * sizeof(*stream_fds)); | |
461 | if (!stream_fds) { | |
462 | ret = -1; | |
463 | goto error_alloc; | |
464 | } | |
465 | for (i = 0; i < nr_stream_fds; i++) { | |
466 | stream_fds[i] = open_ust_stream_fd(channel, attr, i); | |
467 | if (stream_fds[i] < 0) { | |
468 | ret = -1; | |
469 | goto error_open; | |
470 | } | |
471 | } | |
472 | ust_channel = ustctl_create_channel(attr, stream_fds, nr_stream_fds); | |
473 | if (!ust_channel) { | |
ffe60014 DG |
474 | ret = -1; |
475 | goto error_create; | |
476 | } | |
4628484a MD |
477 | channel->nr_stream_fds = nr_stream_fds; |
478 | channel->stream_fds = stream_fds; | |
479 | *ust_chanp = ust_channel; | |
ffe60014 DG |
480 | |
481 | return 0; | |
482 | ||
483 | error_create: | |
4628484a MD |
484 | error_open: |
485 | for (j = i - 1; j >= 0; j--) { | |
486 | int closeret; | |
487 | ||
488 | closeret = close(stream_fds[j]); | |
489 | if (closeret) { | |
490 | PERROR("close"); | |
491 | } | |
492 | if (channel->shm_path[0]) { | |
493 | char shm_path[PATH_MAX]; | |
494 | ||
495 | closeret = get_stream_shm_path(shm_path, | |
496 | channel->shm_path, j); | |
497 | if (closeret) { | |
498 | ERR("Cannot get stream shm path"); | |
499 | } | |
500 | closeret = run_as_unlink(shm_path, | |
501 | channel->uid, channel->gid); | |
502 | if (closeret) { | |
4628484a MD |
503 | PERROR("unlink %s", shm_path); |
504 | } | |
505 | } | |
506 | } | |
507 | /* Try to rmdir all directories under shm_path root. */ | |
508 | if (channel->root_shm_path[0]) { | |
602766ec | 509 | (void) run_as_rmdir_recursive(channel->root_shm_path, |
4628484a MD |
510 | channel->uid, channel->gid); |
511 | } | |
512 | free(stream_fds); | |
513 | error_alloc: | |
ffe60014 DG |
514 | return ret; |
515 | } | |
516 | ||
d88aee68 DG |
517 | /* |
518 | * Send a single given stream to the session daemon using the sock. | |
519 | * | |
520 | * Return 0 on success else a negative value. | |
521 | */ | |
ffe60014 DG |
522 | static int send_sessiond_stream(int sock, struct lttng_consumer_stream *stream) |
523 | { | |
524 | int ret; | |
525 | ||
526 | assert(stream); | |
527 | assert(sock >= 0); | |
528 | ||
3eb914c0 | 529 | DBG("UST consumer sending stream %" PRIu64 " to sessiond", stream->key); |
ffe60014 DG |
530 | |
531 | /* Send stream to session daemon. */ | |
532 | ret = ustctl_send_stream_to_sessiond(sock, stream->ustream); | |
533 | if (ret < 0) { | |
534 | goto error; | |
535 | } | |
536 | ||
ffe60014 DG |
537 | error: |
538 | return ret; | |
539 | } | |
540 | ||
541 | /* | |
542 | * Send channel to sessiond. | |
543 | * | |
d88aee68 | 544 | * Return 0 on success or else a negative value. |
ffe60014 DG |
545 | */ |
546 | static int send_sessiond_channel(int sock, | |
547 | struct lttng_consumer_channel *channel, | |
548 | struct lttng_consumer_local_data *ctx, int *relayd_error) | |
549 | { | |
0c759fc9 | 550 | int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
ffe60014 | 551 | struct lttng_consumer_stream *stream; |
a4baae1b | 552 | uint64_t net_seq_idx = -1ULL; |
ffe60014 DG |
553 | |
554 | assert(channel); | |
555 | assert(ctx); | |
556 | assert(sock >= 0); | |
557 | ||
558 | DBG("UST consumer sending channel %s to sessiond", channel->name); | |
559 | ||
62285ea4 DG |
560 | if (channel->relayd_id != (uint64_t) -1ULL) { |
561 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
562 | |
563 | health_code_update(); | |
564 | ||
62285ea4 DG |
565 | /* Try to send the stream to the relayd if one is available. */ |
566 | ret = consumer_send_relayd_stream(stream, stream->chan->pathname); | |
567 | if (ret < 0) { | |
568 | /* | |
569 | * Flag that the relayd was the problem here probably due to a | |
570 | * communicaton error on the socket. | |
571 | */ | |
572 | if (relayd_error) { | |
573 | *relayd_error = 1; | |
574 | } | |
725d28b2 | 575 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
ffe60014 | 576 | } |
a4baae1b JD |
577 | if (net_seq_idx == -1ULL) { |
578 | net_seq_idx = stream->net_seq_idx; | |
579 | } | |
580 | } | |
f2a444f1 | 581 | } |
ffe60014 | 582 | |
f2a444f1 DG |
583 | /* Inform sessiond that we are about to send channel and streams. */ |
584 | ret = consumer_send_status_msg(sock, ret_code); | |
0c759fc9 | 585 | if (ret < 0 || ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
f2a444f1 DG |
586 | /* |
587 | * Either the session daemon is not responding or the relayd died so we | |
588 | * stop now. | |
589 | */ | |
590 | goto error; | |
591 | } | |
592 | ||
593 | /* Send channel to sessiond. */ | |
594 | ret = ustctl_send_channel_to_sessiond(sock, channel->uchan); | |
595 | if (ret < 0) { | |
596 | goto error; | |
597 | } | |
598 | ||
599 | ret = ustctl_channel_close_wakeup_fd(channel->uchan); | |
600 | if (ret < 0) { | |
601 | goto error; | |
602 | } | |
603 | ||
604 | /* The channel was sent successfully to the sessiond at this point. */ | |
605 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
606 | |
607 | health_code_update(); | |
608 | ||
ffe60014 DG |
609 | /* Send stream to session daemon. */ |
610 | ret = send_sessiond_stream(sock, stream); | |
611 | if (ret < 0) { | |
612 | goto error; | |
613 | } | |
614 | } | |
615 | ||
616 | /* Tell sessiond there is no more stream. */ | |
617 | ret = ustctl_send_stream_to_sessiond(sock, NULL); | |
618 | if (ret < 0) { | |
619 | goto error; | |
620 | } | |
621 | ||
622 | DBG("UST consumer NULL stream sent to sessiond"); | |
623 | ||
624 | return 0; | |
625 | ||
626 | error: | |
0c759fc9 | 627 | if (ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
f2a444f1 DG |
628 | ret = -1; |
629 | } | |
ffe60014 DG |
630 | return ret; |
631 | } | |
632 | ||
633 | /* | |
634 | * Creates a channel and streams and add the channel it to the channel internal | |
635 | * state. The created stream must ONLY be sent once the GET_CHANNEL command is | |
636 | * received. | |
637 | * | |
638 | * Return 0 on success or else, a negative value is returned and the channel | |
639 | * MUST be destroyed by consumer_del_channel(). | |
640 | */ | |
641 | static int ask_channel(struct lttng_consumer_local_data *ctx, int sock, | |
642 | struct lttng_consumer_channel *channel, | |
643 | struct ustctl_consumer_channel_attr *attr) | |
3bd1e081 MD |
644 | { |
645 | int ret; | |
646 | ||
ffe60014 DG |
647 | assert(ctx); |
648 | assert(channel); | |
649 | assert(attr); | |
650 | ||
651 | /* | |
652 | * This value is still used by the kernel consumer since for the kernel, | |
653 | * the stream ownership is not IN the consumer so we need to have the | |
654 | * number of left stream that needs to be initialized so we can know when | |
655 | * to delete the channel (see consumer.c). | |
656 | * | |
657 | * As for the user space tracer now, the consumer creates and sends the | |
658 | * stream to the session daemon which only sends them to the application | |
659 | * once every stream of a channel is received making this value useless | |
660 | * because we they will be added to the poll thread before the application | |
661 | * receives them. This ensures that a stream can not hang up during | |
662 | * initilization of a channel. | |
663 | */ | |
664 | channel->nb_init_stream_left = 0; | |
665 | ||
666 | /* The reply msg status is handled in the following call. */ | |
4628484a | 667 | ret = create_ust_channel(channel, attr, &channel->uchan); |
ffe60014 | 668 | if (ret < 0) { |
10a50311 | 669 | goto end; |
3bd1e081 MD |
670 | } |
671 | ||
d8ef542d MD |
672 | channel->wait_fd = ustctl_channel_get_wait_fd(channel->uchan); |
673 | ||
10a50311 JD |
674 | /* |
675 | * For the snapshots (no monitor), we create the metadata streams | |
676 | * on demand, not during the channel creation. | |
677 | */ | |
678 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && !channel->monitor) { | |
679 | ret = 0; | |
680 | goto end; | |
681 | } | |
682 | ||
ffe60014 DG |
683 | /* Open all streams for this channel. */ |
684 | ret = create_ust_streams(channel, ctx); | |
685 | if (ret < 0) { | |
10a50311 | 686 | goto end; |
ffe60014 DG |
687 | } |
688 | ||
10a50311 | 689 | end: |
3bd1e081 MD |
690 | return ret; |
691 | } | |
692 | ||
d88aee68 DG |
693 | /* |
694 | * Send all stream of a channel to the right thread handling it. | |
695 | * | |
696 | * On error, return a negative value else 0 on success. | |
697 | */ | |
698 | static int send_streams_to_thread(struct lttng_consumer_channel *channel, | |
699 | struct lttng_consumer_local_data *ctx) | |
700 | { | |
701 | int ret = 0; | |
702 | struct lttng_consumer_stream *stream, *stmp; | |
703 | ||
704 | assert(channel); | |
705 | assert(ctx); | |
706 | ||
707 | /* Send streams to the corresponding thread. */ | |
708 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
709 | send_node) { | |
9ce5646a MD |
710 | |
711 | health_code_update(); | |
712 | ||
d88aee68 DG |
713 | /* Sending the stream to the thread. */ |
714 | ret = send_stream_to_thread(stream, ctx); | |
715 | if (ret < 0) { | |
716 | /* | |
717 | * If we are unable to send the stream to the thread, there is | |
718 | * a big problem so just stop everything. | |
719 | */ | |
720 | goto error; | |
721 | } | |
d88aee68 DG |
722 | } |
723 | ||
724 | error: | |
725 | return ret; | |
726 | } | |
727 | ||
7972aab2 DG |
728 | /* |
729 | * Flush channel's streams using the given key to retrieve the channel. | |
730 | * | |
731 | * Return 0 on success else an LTTng error code. | |
732 | */ | |
733 | static int flush_channel(uint64_t chan_key) | |
734 | { | |
735 | int ret = 0; | |
736 | struct lttng_consumer_channel *channel; | |
737 | struct lttng_consumer_stream *stream; | |
738 | struct lttng_ht *ht; | |
739 | struct lttng_ht_iter iter; | |
740 | ||
8fd623e0 | 741 | DBG("UST consumer flush channel key %" PRIu64, chan_key); |
7972aab2 | 742 | |
a500c257 | 743 | rcu_read_lock(); |
7972aab2 DG |
744 | channel = consumer_find_channel(chan_key); |
745 | if (!channel) { | |
8fd623e0 | 746 | ERR("UST consumer flush channel %" PRIu64 " not found", chan_key); |
7972aab2 DG |
747 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
748 | goto error; | |
749 | } | |
750 | ||
751 | ht = consumer_data.stream_per_chan_id_ht; | |
752 | ||
753 | /* For each stream of the channel id, flush it. */ | |
7972aab2 DG |
754 | cds_lfht_for_each_entry_duplicate(ht->ht, |
755 | ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct, | |
756 | &channel->key, &iter.iter, stream, node_channel_id.node) { | |
9ce5646a MD |
757 | |
758 | health_code_update(); | |
759 | ||
0dd01979 MD |
760 | pthread_mutex_lock(&stream->lock); |
761 | if (!stream->quiescent) { | |
762 | ustctl_flush_buffer(stream->ustream, 0); | |
763 | stream->quiescent = true; | |
764 | } | |
765 | pthread_mutex_unlock(&stream->lock); | |
766 | } | |
767 | error: | |
768 | rcu_read_unlock(); | |
769 | return ret; | |
770 | } | |
771 | ||
772 | /* | |
773 | * Clear quiescent state from channel's streams using the given key to | |
774 | * retrieve the channel. | |
775 | * | |
776 | * Return 0 on success else an LTTng error code. | |
777 | */ | |
778 | static int clear_quiescent_channel(uint64_t chan_key) | |
779 | { | |
780 | int ret = 0; | |
781 | struct lttng_consumer_channel *channel; | |
782 | struct lttng_consumer_stream *stream; | |
783 | struct lttng_ht *ht; | |
784 | struct lttng_ht_iter iter; | |
785 | ||
786 | DBG("UST consumer clear quiescent channel key %" PRIu64, chan_key); | |
787 | ||
788 | rcu_read_lock(); | |
789 | channel = consumer_find_channel(chan_key); | |
790 | if (!channel) { | |
791 | ERR("UST consumer clear quiescent channel %" PRIu64 " not found", chan_key); | |
792 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
793 | goto error; | |
794 | } | |
795 | ||
796 | ht = consumer_data.stream_per_chan_id_ht; | |
797 | ||
798 | /* For each stream of the channel id, clear quiescent state. */ | |
799 | cds_lfht_for_each_entry_duplicate(ht->ht, | |
800 | ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct, | |
801 | &channel->key, &iter.iter, stream, node_channel_id.node) { | |
802 | ||
803 | health_code_update(); | |
804 | ||
805 | pthread_mutex_lock(&stream->lock); | |
806 | stream->quiescent = false; | |
807 | pthread_mutex_unlock(&stream->lock); | |
7972aab2 | 808 | } |
7972aab2 | 809 | error: |
a500c257 | 810 | rcu_read_unlock(); |
7972aab2 DG |
811 | return ret; |
812 | } | |
813 | ||
d88aee68 DG |
814 | /* |
815 | * Close metadata stream wakeup_fd using the given key to retrieve the channel. | |
a500c257 | 816 | * RCU read side lock MUST be acquired before calling this function. |
d88aee68 DG |
817 | * |
818 | * Return 0 on success else an LTTng error code. | |
819 | */ | |
820 | static int close_metadata(uint64_t chan_key) | |
821 | { | |
ea88ca2a | 822 | int ret = 0; |
d88aee68 | 823 | struct lttng_consumer_channel *channel; |
f65a74be | 824 | unsigned int channel_monitor; |
d88aee68 | 825 | |
8fd623e0 | 826 | DBG("UST consumer close metadata key %" PRIu64, chan_key); |
d88aee68 DG |
827 | |
828 | channel = consumer_find_channel(chan_key); | |
829 | if (!channel) { | |
84cc9aa0 DG |
830 | /* |
831 | * This is possible if the metadata thread has issue a delete because | |
832 | * the endpoint point of the stream hung up. There is no way the | |
833 | * session daemon can know about it thus use a DBG instead of an actual | |
834 | * error. | |
835 | */ | |
836 | DBG("UST consumer close metadata %" PRIu64 " not found", chan_key); | |
d88aee68 DG |
837 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
838 | goto error; | |
839 | } | |
840 | ||
ea88ca2a | 841 | pthread_mutex_lock(&consumer_data.lock); |
a9838785 | 842 | pthread_mutex_lock(&channel->lock); |
f65a74be | 843 | channel_monitor = channel->monitor; |
73811ecc DG |
844 | if (cds_lfht_is_node_deleted(&channel->node.node)) { |
845 | goto error_unlock; | |
846 | } | |
847 | ||
6d574024 | 848 | lttng_ustconsumer_close_metadata(channel); |
f65a74be JG |
849 | pthread_mutex_unlock(&channel->lock); |
850 | pthread_mutex_unlock(&consumer_data.lock); | |
d88aee68 | 851 | |
f65a74be JG |
852 | /* |
853 | * The ownership of a metadata channel depends on the type of | |
854 | * session to which it belongs. In effect, the monitor flag is checked | |
855 | * to determine if this metadata channel is in "snapshot" mode or not. | |
856 | * | |
857 | * In the non-snapshot case, the metadata channel is created along with | |
858 | * a single stream which will remain present until the metadata channel | |
859 | * is destroyed (on the destruction of its session). In this case, the | |
860 | * metadata stream in "monitored" by the metadata poll thread and holds | |
861 | * the ownership of its channel. | |
862 | * | |
863 | * Closing the metadata will cause the metadata stream's "metadata poll | |
864 | * pipe" to be closed. Closing this pipe will wake-up the metadata poll | |
865 | * thread which will teardown the metadata stream which, in return, | |
866 | * deletes the metadata channel. | |
867 | * | |
868 | * In the snapshot case, the metadata stream is created and destroyed | |
869 | * on every snapshot record. Since the channel doesn't have an owner | |
870 | * other than the session daemon, it is safe to destroy it immediately | |
871 | * on reception of the CLOSE_METADATA command. | |
872 | */ | |
873 | if (!channel_monitor) { | |
874 | /* | |
875 | * The channel and consumer_data locks must be | |
876 | * released before this call since consumer_del_channel | |
877 | * re-acquires the channel and consumer_data locks to teardown | |
878 | * the channel and queue its reclamation by the "call_rcu" | |
879 | * worker thread. | |
880 | */ | |
881 | consumer_del_channel(channel); | |
882 | } | |
883 | ||
884 | return ret; | |
ea88ca2a | 885 | error_unlock: |
a9838785 | 886 | pthread_mutex_unlock(&channel->lock); |
ea88ca2a | 887 | pthread_mutex_unlock(&consumer_data.lock); |
d88aee68 DG |
888 | error: |
889 | return ret; | |
890 | } | |
891 | ||
892 | /* | |
893 | * RCU read side lock MUST be acquired before calling this function. | |
894 | * | |
895 | * Return 0 on success else an LTTng error code. | |
896 | */ | |
897 | static int setup_metadata(struct lttng_consumer_local_data *ctx, uint64_t key) | |
898 | { | |
899 | int ret; | |
900 | struct lttng_consumer_channel *metadata; | |
901 | ||
8fd623e0 | 902 | DBG("UST consumer setup metadata key %" PRIu64, key); |
d88aee68 DG |
903 | |
904 | metadata = consumer_find_channel(key); | |
905 | if (!metadata) { | |
906 | ERR("UST consumer push metadata %" PRIu64 " not found", key); | |
907 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
10a50311 JD |
908 | goto end; |
909 | } | |
910 | ||
911 | /* | |
912 | * In no monitor mode, the metadata channel has no stream(s) so skip the | |
913 | * ownership transfer to the metadata thread. | |
914 | */ | |
915 | if (!metadata->monitor) { | |
916 | DBG("Metadata channel in no monitor"); | |
917 | ret = 0; | |
918 | goto end; | |
d88aee68 DG |
919 | } |
920 | ||
921 | /* | |
922 | * Send metadata stream to relayd if one available. Availability is | |
923 | * known if the stream is still in the list of the channel. | |
924 | */ | |
925 | if (cds_list_empty(&metadata->streams.head)) { | |
926 | ERR("Metadata channel key %" PRIu64 ", no stream available.", key); | |
927 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
f5a0c9cf | 928 | goto error_no_stream; |
d88aee68 DG |
929 | } |
930 | ||
931 | /* Send metadata stream to relayd if needed. */ | |
62285ea4 DG |
932 | if (metadata->metadata_stream->net_seq_idx != (uint64_t) -1ULL) { |
933 | ret = consumer_send_relayd_stream(metadata->metadata_stream, | |
934 | metadata->pathname); | |
935 | if (ret < 0) { | |
936 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
937 | goto error; | |
938 | } | |
601262d6 JD |
939 | ret = consumer_send_relayd_streams_sent( |
940 | metadata->metadata_stream->net_seq_idx); | |
941 | if (ret < 0) { | |
942 | ret = LTTCOMM_CONSUMERD_RELAYD_FAIL; | |
943 | goto error; | |
944 | } | |
d88aee68 DG |
945 | } |
946 | ||
a8086cf4 JR |
947 | /* |
948 | * Ownership of metadata stream is passed along. Freeing is handled by | |
949 | * the callee. | |
950 | */ | |
d88aee68 DG |
951 | ret = send_streams_to_thread(metadata, ctx); |
952 | if (ret < 0) { | |
953 | /* | |
954 | * If we are unable to send the stream to the thread, there is | |
955 | * a big problem so just stop everything. | |
956 | */ | |
957 | ret = LTTCOMM_CONSUMERD_FATAL; | |
a8086cf4 | 958 | goto send_streams_error; |
d88aee68 DG |
959 | } |
960 | /* List MUST be empty after or else it could be reused. */ | |
961 | assert(cds_list_empty(&metadata->streams.head)); | |
962 | ||
10a50311 JD |
963 | ret = 0; |
964 | goto end; | |
d88aee68 DG |
965 | |
966 | error: | |
f2a444f1 DG |
967 | /* |
968 | * Delete metadata channel on error. At this point, the metadata stream can | |
969 | * NOT be monitored by the metadata thread thus having the guarantee that | |
970 | * the stream is still in the local stream list of the channel. This call | |
971 | * will make sure to clean that list. | |
972 | */ | |
f5a0c9cf | 973 | consumer_stream_destroy(metadata->metadata_stream, NULL); |
212d67a2 DG |
974 | cds_list_del(&metadata->metadata_stream->send_node); |
975 | metadata->metadata_stream = NULL; | |
a8086cf4 | 976 | send_streams_error: |
f5a0c9cf | 977 | error_no_stream: |
10a50311 JD |
978 | end: |
979 | return ret; | |
980 | } | |
981 | ||
982 | /* | |
983 | * Snapshot the whole metadata. | |
984 | * | |
985 | * Returns 0 on success, < 0 on error | |
986 | */ | |
987 | static int snapshot_metadata(uint64_t key, char *path, uint64_t relayd_id, | |
988 | struct lttng_consumer_local_data *ctx) | |
989 | { | |
990 | int ret = 0; | |
10a50311 JD |
991 | struct lttng_consumer_channel *metadata_channel; |
992 | struct lttng_consumer_stream *metadata_stream; | |
993 | ||
994 | assert(path); | |
995 | assert(ctx); | |
996 | ||
997 | DBG("UST consumer snapshot metadata with key %" PRIu64 " at path %s", | |
998 | key, path); | |
999 | ||
1000 | rcu_read_lock(); | |
1001 | ||
1002 | metadata_channel = consumer_find_channel(key); | |
1003 | if (!metadata_channel) { | |
6a00837f MD |
1004 | ERR("UST snapshot metadata channel not found for key %" PRIu64, |
1005 | key); | |
10a50311 JD |
1006 | ret = -1; |
1007 | goto error; | |
1008 | } | |
1009 | assert(!metadata_channel->monitor); | |
1010 | ||
9ce5646a MD |
1011 | health_code_update(); |
1012 | ||
10a50311 JD |
1013 | /* |
1014 | * Ask the sessiond if we have new metadata waiting and update the | |
1015 | * consumer metadata cache. | |
1016 | */ | |
94d49140 | 1017 | ret = lttng_ustconsumer_request_metadata(ctx, metadata_channel, 0, 1); |
10a50311 JD |
1018 | if (ret < 0) { |
1019 | goto error; | |
1020 | } | |
1021 | ||
9ce5646a MD |
1022 | health_code_update(); |
1023 | ||
10a50311 JD |
1024 | /* |
1025 | * The metadata stream is NOT created in no monitor mode when the channel | |
1026 | * is created on a sessiond ask channel command. | |
1027 | */ | |
1028 | ret = create_ust_streams(metadata_channel, ctx); | |
1029 | if (ret < 0) { | |
1030 | goto error; | |
1031 | } | |
1032 | ||
1033 | metadata_stream = metadata_channel->metadata_stream; | |
1034 | assert(metadata_stream); | |
1035 | ||
1036 | if (relayd_id != (uint64_t) -1ULL) { | |
1037 | metadata_stream->net_seq_idx = relayd_id; | |
1038 | ret = consumer_send_relayd_stream(metadata_stream, path); | |
1039 | if (ret < 0) { | |
1040 | goto error_stream; | |
1041 | } | |
1042 | } else { | |
1043 | ret = utils_create_stream_file(path, metadata_stream->name, | |
1044 | metadata_stream->chan->tracefile_size, | |
1045 | metadata_stream->tracefile_count_current, | |
309167d2 | 1046 | metadata_stream->uid, metadata_stream->gid, NULL); |
10a50311 JD |
1047 | if (ret < 0) { |
1048 | goto error_stream; | |
1049 | } | |
1050 | metadata_stream->out_fd = ret; | |
1051 | metadata_stream->tracefile_size_current = 0; | |
1052 | } | |
1053 | ||
04ef1097 | 1054 | do { |
9ce5646a MD |
1055 | health_code_update(); |
1056 | ||
10a50311 JD |
1057 | ret = lttng_consumer_read_subbuffer(metadata_stream, ctx); |
1058 | if (ret < 0) { | |
94d49140 | 1059 | goto error_stream; |
10a50311 | 1060 | } |
04ef1097 | 1061 | } while (ret > 0); |
10a50311 | 1062 | |
10a50311 JD |
1063 | error_stream: |
1064 | /* | |
1065 | * Clean up the stream completly because the next snapshot will use a new | |
1066 | * metadata stream. | |
1067 | */ | |
10a50311 | 1068 | consumer_stream_destroy(metadata_stream, NULL); |
212d67a2 | 1069 | cds_list_del(&metadata_stream->send_node); |
10a50311 JD |
1070 | metadata_channel->metadata_stream = NULL; |
1071 | ||
1072 | error: | |
1073 | rcu_read_unlock(); | |
1074 | return ret; | |
1075 | } | |
1076 | ||
1077 | /* | |
1078 | * Take a snapshot of all the stream of a channel. | |
1079 | * | |
1080 | * Returns 0 on success, < 0 on error | |
1081 | */ | |
1082 | static int snapshot_channel(uint64_t key, char *path, uint64_t relayd_id, | |
d07ceecd | 1083 | uint64_t nb_packets_per_stream, struct lttng_consumer_local_data *ctx) |
10a50311 JD |
1084 | { |
1085 | int ret; | |
1086 | unsigned use_relayd = 0; | |
1087 | unsigned long consumed_pos, produced_pos; | |
1088 | struct lttng_consumer_channel *channel; | |
1089 | struct lttng_consumer_stream *stream; | |
1090 | ||
1091 | assert(path); | |
1092 | assert(ctx); | |
1093 | ||
1094 | rcu_read_lock(); | |
1095 | ||
1096 | if (relayd_id != (uint64_t) -1ULL) { | |
1097 | use_relayd = 1; | |
1098 | } | |
1099 | ||
1100 | channel = consumer_find_channel(key); | |
1101 | if (!channel) { | |
6a00837f | 1102 | ERR("UST snapshot channel not found for key %" PRIu64, key); |
10a50311 JD |
1103 | ret = -1; |
1104 | goto error; | |
1105 | } | |
1106 | assert(!channel->monitor); | |
6a00837f | 1107 | DBG("UST consumer snapshot channel %" PRIu64, key); |
10a50311 JD |
1108 | |
1109 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
1110 | health_code_update(); |
1111 | ||
10a50311 JD |
1112 | /* Lock stream because we are about to change its state. */ |
1113 | pthread_mutex_lock(&stream->lock); | |
1114 | stream->net_seq_idx = relayd_id; | |
1115 | ||
1116 | if (use_relayd) { | |
1117 | ret = consumer_send_relayd_stream(stream, path); | |
1118 | if (ret < 0) { | |
1119 | goto error_unlock; | |
1120 | } | |
1121 | } else { | |
1122 | ret = utils_create_stream_file(path, stream->name, | |
1123 | stream->chan->tracefile_size, | |
1124 | stream->tracefile_count_current, | |
309167d2 | 1125 | stream->uid, stream->gid, NULL); |
10a50311 JD |
1126 | if (ret < 0) { |
1127 | goto error_unlock; | |
1128 | } | |
1129 | stream->out_fd = ret; | |
1130 | stream->tracefile_size_current = 0; | |
1131 | ||
1132 | DBG("UST consumer snapshot stream %s/%s (%" PRIu64 ")", path, | |
1133 | stream->name, stream->key); | |
1134 | } | |
1135 | ||
d4d80f77 MD |
1136 | /* |
1137 | * If tracing is active, we want to perform a "full" buffer flush. | |
1138 | * Else, if quiescent, it has already been done by the prior stop. | |
1139 | */ | |
1140 | if (!stream->quiescent) { | |
1141 | ustctl_flush_buffer(stream->ustream, 0); | |
1142 | } | |
10a50311 JD |
1143 | |
1144 | ret = lttng_ustconsumer_take_snapshot(stream); | |
1145 | if (ret < 0) { | |
1146 | ERR("Taking UST snapshot"); | |
1147 | goto error_unlock; | |
1148 | } | |
1149 | ||
1150 | ret = lttng_ustconsumer_get_produced_snapshot(stream, &produced_pos); | |
1151 | if (ret < 0) { | |
1152 | ERR("Produced UST snapshot position"); | |
1153 | goto error_unlock; | |
1154 | } | |
1155 | ||
1156 | ret = lttng_ustconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
1157 | if (ret < 0) { | |
1158 | ERR("Consumerd UST snapshot position"); | |
1159 | goto error_unlock; | |
1160 | } | |
1161 | ||
5c786ded JD |
1162 | /* |
1163 | * The original value is sent back if max stream size is larger than | |
d07ceecd | 1164 | * the possible size of the snapshot. Also, we assume that the session |
5c786ded JD |
1165 | * daemon should never send a maximum stream size that is lower than |
1166 | * subbuffer size. | |
1167 | */ | |
d07ceecd MD |
1168 | consumed_pos = consumer_get_consume_start_pos(consumed_pos, |
1169 | produced_pos, nb_packets_per_stream, | |
1170 | stream->max_sb_size); | |
5c786ded | 1171 | |
10a50311 JD |
1172 | while (consumed_pos < produced_pos) { |
1173 | ssize_t read_len; | |
1174 | unsigned long len, padded_len; | |
1175 | ||
9ce5646a MD |
1176 | health_code_update(); |
1177 | ||
10a50311 JD |
1178 | DBG("UST consumer taking snapshot at pos %lu", consumed_pos); |
1179 | ||
1180 | ret = ustctl_get_subbuf(stream->ustream, &consumed_pos); | |
1181 | if (ret < 0) { | |
1182 | if (ret != -EAGAIN) { | |
1183 | PERROR("ustctl_get_subbuf snapshot"); | |
1184 | goto error_close_stream; | |
1185 | } | |
1186 | DBG("UST consumer get subbuf failed. Skipping it."); | |
1187 | consumed_pos += stream->max_sb_size; | |
ddc93ee4 | 1188 | stream->chan->lost_packets++; |
10a50311 JD |
1189 | continue; |
1190 | } | |
1191 | ||
1192 | ret = ustctl_get_subbuf_size(stream->ustream, &len); | |
1193 | if (ret < 0) { | |
1194 | ERR("Snapshot ustctl_get_subbuf_size"); | |
1195 | goto error_put_subbuf; | |
1196 | } | |
1197 | ||
1198 | ret = ustctl_get_padded_subbuf_size(stream->ustream, &padded_len); | |
1199 | if (ret < 0) { | |
1200 | ERR("Snapshot ustctl_get_padded_subbuf_size"); | |
1201 | goto error_put_subbuf; | |
1202 | } | |
1203 | ||
1204 | read_len = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, len, | |
309167d2 | 1205 | padded_len - len, NULL); |
10a50311 JD |
1206 | if (use_relayd) { |
1207 | if (read_len != len) { | |
56591bac | 1208 | ret = -EPERM; |
10a50311 JD |
1209 | goto error_put_subbuf; |
1210 | } | |
1211 | } else { | |
1212 | if (read_len != padded_len) { | |
56591bac | 1213 | ret = -EPERM; |
10a50311 JD |
1214 | goto error_put_subbuf; |
1215 | } | |
1216 | } | |
1217 | ||
1218 | ret = ustctl_put_subbuf(stream->ustream); | |
1219 | if (ret < 0) { | |
1220 | ERR("Snapshot ustctl_put_subbuf"); | |
1221 | goto error_close_stream; | |
1222 | } | |
1223 | consumed_pos += stream->max_sb_size; | |
1224 | } | |
1225 | ||
1226 | /* Simply close the stream so we can use it on the next snapshot. */ | |
1227 | consumer_stream_close(stream); | |
1228 | pthread_mutex_unlock(&stream->lock); | |
1229 | } | |
1230 | ||
1231 | rcu_read_unlock(); | |
1232 | return 0; | |
1233 | ||
1234 | error_put_subbuf: | |
1235 | if (ustctl_put_subbuf(stream->ustream) < 0) { | |
1236 | ERR("Snapshot ustctl_put_subbuf"); | |
1237 | } | |
1238 | error_close_stream: | |
1239 | consumer_stream_close(stream); | |
1240 | error_unlock: | |
1241 | pthread_mutex_unlock(&stream->lock); | |
1242 | error: | |
1243 | rcu_read_unlock(); | |
d88aee68 DG |
1244 | return ret; |
1245 | } | |
1246 | ||
331744e3 | 1247 | /* |
c585821b MD |
1248 | * Receive the metadata updates from the sessiond. Supports receiving |
1249 | * overlapping metadata, but is needs to always belong to a contiguous | |
1250 | * range starting from 0. | |
1251 | * Be careful about the locks held when calling this function: it needs | |
1252 | * the metadata cache flush to concurrently progress in order to | |
1253 | * complete. | |
331744e3 JD |
1254 | */ |
1255 | int lttng_ustconsumer_recv_metadata(int sock, uint64_t key, uint64_t offset, | |
93ec662e JD |
1256 | uint64_t len, uint64_t version, |
1257 | struct lttng_consumer_channel *channel, int timer, int wait) | |
331744e3 | 1258 | { |
0c759fc9 | 1259 | int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
331744e3 JD |
1260 | char *metadata_str; |
1261 | ||
8fd623e0 | 1262 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, len); |
331744e3 JD |
1263 | |
1264 | metadata_str = zmalloc(len * sizeof(char)); | |
1265 | if (!metadata_str) { | |
1266 | PERROR("zmalloc metadata string"); | |
1267 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; | |
1268 | goto end; | |
1269 | } | |
1270 | ||
9ce5646a MD |
1271 | health_code_update(); |
1272 | ||
331744e3 JD |
1273 | /* Receive metadata string. */ |
1274 | ret = lttcomm_recv_unix_sock(sock, metadata_str, len); | |
1275 | if (ret < 0) { | |
1276 | /* Session daemon is dead so return gracefully. */ | |
1277 | ret_code = ret; | |
1278 | goto end_free; | |
1279 | } | |
1280 | ||
9ce5646a MD |
1281 | health_code_update(); |
1282 | ||
331744e3 | 1283 | pthread_mutex_lock(&channel->metadata_cache->lock); |
93ec662e JD |
1284 | ret = consumer_metadata_cache_write(channel, offset, len, version, |
1285 | metadata_str); | |
331744e3 JD |
1286 | if (ret < 0) { |
1287 | /* Unable to handle metadata. Notify session daemon. */ | |
1288 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
a32bd775 DG |
1289 | /* |
1290 | * Skip metadata flush on write error since the offset and len might | |
1291 | * not have been updated which could create an infinite loop below when | |
1292 | * waiting for the metadata cache to be flushed. | |
1293 | */ | |
1294 | pthread_mutex_unlock(&channel->metadata_cache->lock); | |
a32bd775 | 1295 | goto end_free; |
331744e3 JD |
1296 | } |
1297 | pthread_mutex_unlock(&channel->metadata_cache->lock); | |
1298 | ||
94d49140 JD |
1299 | if (!wait) { |
1300 | goto end_free; | |
1301 | } | |
5e41ebe1 | 1302 | while (consumer_metadata_cache_flushed(channel, offset + len, timer)) { |
331744e3 | 1303 | DBG("Waiting for metadata to be flushed"); |
9ce5646a MD |
1304 | |
1305 | health_code_update(); | |
1306 | ||
331744e3 JD |
1307 | usleep(DEFAULT_METADATA_AVAILABILITY_WAIT_TIME); |
1308 | } | |
1309 | ||
1310 | end_free: | |
1311 | free(metadata_str); | |
1312 | end: | |
1313 | return ret_code; | |
1314 | } | |
1315 | ||
4cbc1a04 DG |
1316 | /* |
1317 | * Receive command from session daemon and process it. | |
1318 | * | |
1319 | * Return 1 on success else a negative value or 0. | |
1320 | */ | |
3bd1e081 MD |
1321 | int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
1322 | int sock, struct pollfd *consumer_sockpoll) | |
1323 | { | |
1324 | ssize_t ret; | |
0c759fc9 | 1325 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
3bd1e081 | 1326 | struct lttcomm_consumer_msg msg; |
ffe60014 | 1327 | struct lttng_consumer_channel *channel = NULL; |
3bd1e081 | 1328 | |
9ce5646a MD |
1329 | health_code_update(); |
1330 | ||
3bd1e081 MD |
1331 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); |
1332 | if (ret != sizeof(msg)) { | |
173af62f DG |
1333 | DBG("Consumer received unexpected message size %zd (expects %zu)", |
1334 | ret, sizeof(msg)); | |
3be74084 DG |
1335 | /* |
1336 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
1337 | * since the caller handles this. | |
1338 | */ | |
489f70e9 | 1339 | if (ret > 0) { |
c6857fcf | 1340 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
489f70e9 MD |
1341 | ret = -1; |
1342 | } | |
3bd1e081 MD |
1343 | return ret; |
1344 | } | |
9ce5646a MD |
1345 | |
1346 | health_code_update(); | |
1347 | ||
84382d49 MD |
1348 | /* deprecated */ |
1349 | assert(msg.cmd_type != LTTNG_CONSUMER_STOP); | |
3bd1e081 | 1350 | |
9ce5646a MD |
1351 | health_code_update(); |
1352 | ||
3f8e211f | 1353 | /* relayd needs RCU read-side lock */ |
b0b335c8 MD |
1354 | rcu_read_lock(); |
1355 | ||
3bd1e081 | 1356 | switch (msg.cmd_type) { |
00e2e675 DG |
1357 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
1358 | { | |
f50f23d9 | 1359 | /* Session daemon status message are handled in the following call. */ |
2527bf85 | 1360 | consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
7735ef9e | 1361 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, |
d3e2ba59 JD |
1362 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id, |
1363 | msg.u.relayd_sock.relayd_session_id); | |
00e2e675 DG |
1364 | goto end_nosignal; |
1365 | } | |
173af62f DG |
1366 | case LTTNG_CONSUMER_DESTROY_RELAYD: |
1367 | { | |
a6ba4fe1 | 1368 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
173af62f DG |
1369 | struct consumer_relayd_sock_pair *relayd; |
1370 | ||
a6ba4fe1 | 1371 | DBG("UST consumer destroying relayd %" PRIu64, index); |
173af62f DG |
1372 | |
1373 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 1374 | relayd = consumer_find_relayd(index); |
173af62f | 1375 | if (relayd == NULL) { |
3448e266 | 1376 | DBG("Unable to find relayd %" PRIu64, index); |
e462382a | 1377 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
173af62f DG |
1378 | } |
1379 | ||
a6ba4fe1 DG |
1380 | /* |
1381 | * Each relayd socket pair has a refcount of stream attached to it | |
1382 | * which tells if the relayd is still active or not depending on the | |
1383 | * refcount value. | |
1384 | * | |
1385 | * This will set the destroy flag of the relayd object and destroy it | |
1386 | * if the refcount reaches zero when called. | |
1387 | * | |
1388 | * The destroy can happen either here or when a stream fd hangs up. | |
1389 | */ | |
f50f23d9 DG |
1390 | if (relayd) { |
1391 | consumer_flag_relayd_for_destroy(relayd); | |
1392 | } | |
1393 | ||
d88aee68 | 1394 | goto end_msg_sessiond; |
173af62f | 1395 | } |
3bd1e081 MD |
1396 | case LTTNG_CONSUMER_UPDATE_STREAM: |
1397 | { | |
3f8e211f | 1398 | rcu_read_unlock(); |
7ad0a0cb | 1399 | return -ENOSYS; |
3bd1e081 | 1400 | } |
6d805429 | 1401 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 1402 | { |
3be74084 | 1403 | int ret, is_data_pending; |
6d805429 | 1404 | uint64_t id = msg.u.data_pending.session_id; |
ca22feea | 1405 | |
6d805429 | 1406 | DBG("UST consumer data pending command for id %" PRIu64, id); |
ca22feea | 1407 | |
3be74084 | 1408 | is_data_pending = consumer_data_pending(id); |
ca22feea DG |
1409 | |
1410 | /* Send back returned value to session daemon */ | |
3be74084 DG |
1411 | ret = lttcomm_send_unix_sock(sock, &is_data_pending, |
1412 | sizeof(is_data_pending)); | |
ca22feea | 1413 | if (ret < 0) { |
3be74084 | 1414 | DBG("Error when sending the data pending ret code: %d", ret); |
489f70e9 | 1415 | goto error_fatal; |
ca22feea | 1416 | } |
f50f23d9 DG |
1417 | |
1418 | /* | |
1419 | * No need to send back a status message since the data pending | |
1420 | * returned value is the response. | |
1421 | */ | |
ca22feea | 1422 | break; |
53632229 | 1423 | } |
ffe60014 DG |
1424 | case LTTNG_CONSUMER_ASK_CHANNEL_CREATION: |
1425 | { | |
1426 | int ret; | |
1427 | struct ustctl_consumer_channel_attr attr; | |
1428 | ||
1429 | /* Create a plain object and reserve a channel key. */ | |
1430 | channel = allocate_channel(msg.u.ask_channel.session_id, | |
1431 | msg.u.ask_channel.pathname, msg.u.ask_channel.name, | |
1432 | msg.u.ask_channel.uid, msg.u.ask_channel.gid, | |
1433 | msg.u.ask_channel.relayd_id, msg.u.ask_channel.key, | |
1624d5b7 JD |
1434 | (enum lttng_event_output) msg.u.ask_channel.output, |
1435 | msg.u.ask_channel.tracefile_size, | |
2bba9e53 | 1436 | msg.u.ask_channel.tracefile_count, |
1950109e | 1437 | msg.u.ask_channel.session_id_per_pid, |
ecc48a90 | 1438 | msg.u.ask_channel.monitor, |
d7ba1388 | 1439 | msg.u.ask_channel.live_timer_interval, |
3d071855 | 1440 | msg.u.ask_channel.root_shm_path, |
d7ba1388 | 1441 | msg.u.ask_channel.shm_path); |
ffe60014 DG |
1442 | if (!channel) { |
1443 | goto end_channel_error; | |
1444 | } | |
1445 | ||
567eb353 DG |
1446 | /* |
1447 | * Assign UST application UID to the channel. This value is ignored for | |
1448 | * per PID buffers. This is specific to UST thus setting this after the | |
1449 | * allocation. | |
1450 | */ | |
1451 | channel->ust_app_uid = msg.u.ask_channel.ust_app_uid; | |
1452 | ||
ffe60014 DG |
1453 | /* Build channel attributes from received message. */ |
1454 | attr.subbuf_size = msg.u.ask_channel.subbuf_size; | |
1455 | attr.num_subbuf = msg.u.ask_channel.num_subbuf; | |
1456 | attr.overwrite = msg.u.ask_channel.overwrite; | |
1457 | attr.switch_timer_interval = msg.u.ask_channel.switch_timer_interval; | |
1458 | attr.read_timer_interval = msg.u.ask_channel.read_timer_interval; | |
7972aab2 | 1459 | attr.chan_id = msg.u.ask_channel.chan_id; |
ffe60014 | 1460 | memcpy(attr.uuid, msg.u.ask_channel.uuid, sizeof(attr.uuid)); |
491d1539 | 1461 | attr.blocking_timeout= msg.u.ask_channel.blocking_timeout; |
ffe60014 | 1462 | |
0c759fc9 DG |
1463 | /* Match channel buffer type to the UST abi. */ |
1464 | switch (msg.u.ask_channel.output) { | |
1465 | case LTTNG_EVENT_MMAP: | |
1466 | default: | |
1467 | attr.output = LTTNG_UST_MMAP; | |
1468 | break; | |
1469 | } | |
1470 | ||
ffe60014 DG |
1471 | /* Translate and save channel type. */ |
1472 | switch (msg.u.ask_channel.type) { | |
1473 | case LTTNG_UST_CHAN_PER_CPU: | |
1474 | channel->type = CONSUMER_CHANNEL_TYPE_DATA; | |
1475 | attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8633d6e3 MD |
1476 | /* |
1477 | * Set refcount to 1 for owner. Below, we will | |
1478 | * pass ownership to the | |
1479 | * consumer_thread_channel_poll() thread. | |
1480 | */ | |
1481 | channel->refcount = 1; | |
ffe60014 DG |
1482 | break; |
1483 | case LTTNG_UST_CHAN_METADATA: | |
1484 | channel->type = CONSUMER_CHANNEL_TYPE_METADATA; | |
1485 | attr.type = LTTNG_UST_CHAN_METADATA; | |
1486 | break; | |
1487 | default: | |
1488 | assert(0); | |
1489 | goto error_fatal; | |
1490 | }; | |
1491 | ||
9ce5646a MD |
1492 | health_code_update(); |
1493 | ||
ffe60014 DG |
1494 | ret = ask_channel(ctx, sock, channel, &attr); |
1495 | if (ret < 0) { | |
1496 | goto end_channel_error; | |
1497 | } | |
1498 | ||
fc643247 MD |
1499 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
1500 | ret = consumer_metadata_cache_allocate(channel); | |
1501 | if (ret < 0) { | |
1502 | ERR("Allocating metadata cache"); | |
1503 | goto end_channel_error; | |
1504 | } | |
1505 | consumer_timer_switch_start(channel, attr.switch_timer_interval); | |
1506 | attr.switch_timer_interval = 0; | |
94d49140 | 1507 | } else { |
e9404c27 JG |
1508 | int monitor_start_ret; |
1509 | ||
94d49140 JD |
1510 | consumer_timer_live_start(channel, |
1511 | msg.u.ask_channel.live_timer_interval); | |
e9404c27 JG |
1512 | monitor_start_ret = consumer_timer_monitor_start( |
1513 | channel, | |
1514 | msg.u.ask_channel.monitor_timer_interval); | |
1515 | if (monitor_start_ret < 0) { | |
1516 | ERR("Starting channel monitoring timer failed"); | |
1517 | goto end_channel_error; | |
1518 | } | |
fc643247 MD |
1519 | } |
1520 | ||
9ce5646a MD |
1521 | health_code_update(); |
1522 | ||
ffe60014 DG |
1523 | /* |
1524 | * Add the channel to the internal state AFTER all streams were created | |
1525 | * and successfully sent to session daemon. This way, all streams must | |
1526 | * be ready before this channel is visible to the threads. | |
fc643247 MD |
1527 | * If add_channel succeeds, ownership of the channel is |
1528 | * passed to consumer_thread_channel_poll(). | |
ffe60014 DG |
1529 | */ |
1530 | ret = add_channel(channel, ctx); | |
1531 | if (ret < 0) { | |
ea88ca2a MD |
1532 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
1533 | if (channel->switch_timer_enabled == 1) { | |
1534 | consumer_timer_switch_stop(channel); | |
1535 | } | |
1536 | consumer_metadata_cache_destroy(channel); | |
1537 | } | |
d3e2ba59 JD |
1538 | if (channel->live_timer_enabled == 1) { |
1539 | consumer_timer_live_stop(channel); | |
1540 | } | |
e9404c27 JG |
1541 | if (channel->monitor_timer_enabled == 1) { |
1542 | consumer_timer_monitor_stop(channel); | |
1543 | } | |
ffe60014 DG |
1544 | goto end_channel_error; |
1545 | } | |
1546 | ||
9ce5646a MD |
1547 | health_code_update(); |
1548 | ||
ffe60014 DG |
1549 | /* |
1550 | * Channel and streams are now created. Inform the session daemon that | |
1551 | * everything went well and should wait to receive the channel and | |
1552 | * streams with ustctl API. | |
1553 | */ | |
1554 | ret = consumer_send_status_channel(sock, channel); | |
1555 | if (ret < 0) { | |
1556 | /* | |
489f70e9 | 1557 | * There is probably a problem on the socket. |
ffe60014 | 1558 | */ |
489f70e9 | 1559 | goto error_fatal; |
ffe60014 DG |
1560 | } |
1561 | ||
1562 | break; | |
1563 | } | |
1564 | case LTTNG_CONSUMER_GET_CHANNEL: | |
1565 | { | |
1566 | int ret, relayd_err = 0; | |
d88aee68 | 1567 | uint64_t key = msg.u.get_channel.key; |
ffe60014 | 1568 | struct lttng_consumer_channel *channel; |
ffe60014 DG |
1569 | |
1570 | channel = consumer_find_channel(key); | |
1571 | if (!channel) { | |
8fd623e0 | 1572 | ERR("UST consumer get channel key %" PRIu64 " not found", key); |
e462382a | 1573 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
ffe60014 DG |
1574 | goto end_msg_sessiond; |
1575 | } | |
1576 | ||
9ce5646a MD |
1577 | health_code_update(); |
1578 | ||
ffe60014 DG |
1579 | /* Send everything to sessiond. */ |
1580 | ret = send_sessiond_channel(sock, channel, ctx, &relayd_err); | |
1581 | if (ret < 0) { | |
1582 | if (relayd_err) { | |
1583 | /* | |
1584 | * We were unable to send to the relayd the stream so avoid | |
1585 | * sending back a fatal error to the thread since this is OK | |
f2a444f1 DG |
1586 | * and the consumer can continue its work. The above call |
1587 | * has sent the error status message to the sessiond. | |
ffe60014 | 1588 | */ |
f2a444f1 | 1589 | goto end_nosignal; |
ffe60014 DG |
1590 | } |
1591 | /* | |
1592 | * The communicaton was broken hence there is a bad state between | |
1593 | * the consumer and sessiond so stop everything. | |
1594 | */ | |
1595 | goto error_fatal; | |
1596 | } | |
1597 | ||
9ce5646a MD |
1598 | health_code_update(); |
1599 | ||
10a50311 JD |
1600 | /* |
1601 | * In no monitor mode, the streams ownership is kept inside the channel | |
1602 | * so don't send them to the data thread. | |
1603 | */ | |
1604 | if (!channel->monitor) { | |
1605 | goto end_msg_sessiond; | |
1606 | } | |
1607 | ||
d88aee68 DG |
1608 | ret = send_streams_to_thread(channel, ctx); |
1609 | if (ret < 0) { | |
1610 | /* | |
1611 | * If we are unable to send the stream to the thread, there is | |
1612 | * a big problem so just stop everything. | |
1613 | */ | |
1614 | goto error_fatal; | |
ffe60014 | 1615 | } |
ffe60014 DG |
1616 | /* List MUST be empty after or else it could be reused. */ |
1617 | assert(cds_list_empty(&channel->streams.head)); | |
d88aee68 DG |
1618 | goto end_msg_sessiond; |
1619 | } | |
1620 | case LTTNG_CONSUMER_DESTROY_CHANNEL: | |
1621 | { | |
1622 | uint64_t key = msg.u.destroy_channel.key; | |
d88aee68 | 1623 | |
a0cbdd2e MD |
1624 | /* |
1625 | * Only called if streams have not been sent to stream | |
1626 | * manager thread. However, channel has been sent to | |
1627 | * channel manager thread. | |
1628 | */ | |
1629 | notify_thread_del_channel(ctx, key); | |
d88aee68 | 1630 | goto end_msg_sessiond; |
ffe60014 | 1631 | } |
d88aee68 DG |
1632 | case LTTNG_CONSUMER_CLOSE_METADATA: |
1633 | { | |
1634 | int ret; | |
1635 | ||
1636 | ret = close_metadata(msg.u.close_metadata.key); | |
1637 | if (ret != 0) { | |
1638 | ret_code = ret; | |
1639 | } | |
1640 | ||
1641 | goto end_msg_sessiond; | |
1642 | } | |
7972aab2 DG |
1643 | case LTTNG_CONSUMER_FLUSH_CHANNEL: |
1644 | { | |
1645 | int ret; | |
1646 | ||
1647 | ret = flush_channel(msg.u.flush_channel.key); | |
1648 | if (ret != 0) { | |
1649 | ret_code = ret; | |
1650 | } | |
1651 | ||
1652 | goto end_msg_sessiond; | |
1653 | } | |
0dd01979 MD |
1654 | case LTTNG_CONSUMER_CLEAR_QUIESCENT_CHANNEL: |
1655 | { | |
1656 | int ret; | |
1657 | ||
1658 | ret = clear_quiescent_channel( | |
1659 | msg.u.clear_quiescent_channel.key); | |
1660 | if (ret != 0) { | |
1661 | ret_code = ret; | |
1662 | } | |
1663 | ||
1664 | goto end_msg_sessiond; | |
1665 | } | |
d88aee68 | 1666 | case LTTNG_CONSUMER_PUSH_METADATA: |
ffe60014 DG |
1667 | { |
1668 | int ret; | |
d88aee68 | 1669 | uint64_t len = msg.u.push_metadata.len; |
d88aee68 | 1670 | uint64_t key = msg.u.push_metadata.key; |
331744e3 | 1671 | uint64_t offset = msg.u.push_metadata.target_offset; |
93ec662e | 1672 | uint64_t version = msg.u.push_metadata.version; |
ffe60014 DG |
1673 | struct lttng_consumer_channel *channel; |
1674 | ||
8fd623e0 DG |
1675 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, |
1676 | len); | |
ffe60014 DG |
1677 | |
1678 | channel = consumer_find_channel(key); | |
1679 | if (!channel) { | |
000baf6a DG |
1680 | /* |
1681 | * This is possible if the metadata creation on the consumer side | |
1682 | * is in flight vis-a-vis a concurrent push metadata from the | |
1683 | * session daemon. Simply return that the channel failed and the | |
1684 | * session daemon will handle that message correctly considering | |
1685 | * that this race is acceptable thus the DBG() statement here. | |
1686 | */ | |
1687 | DBG("UST consumer push metadata %" PRIu64 " not found", key); | |
1688 | ret_code = LTTCOMM_CONSUMERD_CHANNEL_FAIL; | |
4a2eb0ca | 1689 | goto end_msg_sessiond; |
d88aee68 DG |
1690 | } |
1691 | ||
9ce5646a MD |
1692 | health_code_update(); |
1693 | ||
c585821b MD |
1694 | if (!len) { |
1695 | /* | |
1696 | * There is nothing to receive. We have simply | |
1697 | * checked whether the channel can be found. | |
1698 | */ | |
1699 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1700 | goto end_msg_sessiond; | |
1701 | } | |
1702 | ||
d88aee68 | 1703 | /* Tell session daemon we are ready to receive the metadata. */ |
0c759fc9 | 1704 | ret = consumer_send_status_msg(sock, LTTCOMM_CONSUMERD_SUCCESS); |
ffe60014 DG |
1705 | if (ret < 0) { |
1706 | /* Somehow, the session daemon is not responding anymore. */ | |
d88aee68 DG |
1707 | goto error_fatal; |
1708 | } | |
1709 | ||
9ce5646a MD |
1710 | health_code_update(); |
1711 | ||
d88aee68 | 1712 | /* Wait for more data. */ |
9ce5646a MD |
1713 | health_poll_entry(); |
1714 | ret = lttng_consumer_poll_socket(consumer_sockpoll); | |
1715 | health_poll_exit(); | |
84382d49 | 1716 | if (ret) { |
489f70e9 | 1717 | goto error_fatal; |
d88aee68 DG |
1718 | } |
1719 | ||
9ce5646a MD |
1720 | health_code_update(); |
1721 | ||
331744e3 | 1722 | ret = lttng_ustconsumer_recv_metadata(sock, key, offset, |
93ec662e | 1723 | len, version, channel, 0, 1); |
d88aee68 | 1724 | if (ret < 0) { |
331744e3 | 1725 | /* error receiving from sessiond */ |
489f70e9 | 1726 | goto error_fatal; |
331744e3 JD |
1727 | } else { |
1728 | ret_code = ret; | |
d88aee68 DG |
1729 | goto end_msg_sessiond; |
1730 | } | |
d88aee68 DG |
1731 | } |
1732 | case LTTNG_CONSUMER_SETUP_METADATA: | |
1733 | { | |
1734 | int ret; | |
1735 | ||
1736 | ret = setup_metadata(ctx, msg.u.setup_metadata.key); | |
1737 | if (ret) { | |
1738 | ret_code = ret; | |
1739 | } | |
1740 | goto end_msg_sessiond; | |
ffe60014 | 1741 | } |
6dc3064a DG |
1742 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
1743 | { | |
10a50311 JD |
1744 | if (msg.u.snapshot_channel.metadata) { |
1745 | ret = snapshot_metadata(msg.u.snapshot_channel.key, | |
1746 | msg.u.snapshot_channel.pathname, | |
1747 | msg.u.snapshot_channel.relayd_id, | |
1748 | ctx); | |
1749 | if (ret < 0) { | |
1750 | ERR("Snapshot metadata failed"); | |
e462382a | 1751 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; |
10a50311 JD |
1752 | } |
1753 | } else { | |
1754 | ret = snapshot_channel(msg.u.snapshot_channel.key, | |
1755 | msg.u.snapshot_channel.pathname, | |
1756 | msg.u.snapshot_channel.relayd_id, | |
d07ceecd | 1757 | msg.u.snapshot_channel.nb_packets_per_stream, |
10a50311 JD |
1758 | ctx); |
1759 | if (ret < 0) { | |
1760 | ERR("Snapshot channel failed"); | |
e462382a | 1761 | ret_code = LTTCOMM_CONSUMERD_CHANNEL_FAIL; |
10a50311 JD |
1762 | } |
1763 | } | |
1764 | ||
9ce5646a | 1765 | health_code_update(); |
6dc3064a DG |
1766 | ret = consumer_send_status_msg(sock, ret_code); |
1767 | if (ret < 0) { | |
1768 | /* Somehow, the session daemon is not responding anymore. */ | |
1769 | goto end_nosignal; | |
1770 | } | |
9ce5646a | 1771 | health_code_update(); |
6dc3064a DG |
1772 | break; |
1773 | } | |
fb83fe64 JD |
1774 | case LTTNG_CONSUMER_DISCARDED_EVENTS: |
1775 | { | |
beb59458 MJ |
1776 | int ret = 0; |
1777 | uint64_t discarded_events; | |
fb83fe64 JD |
1778 | struct lttng_ht_iter iter; |
1779 | struct lttng_ht *ht; | |
1780 | struct lttng_consumer_stream *stream; | |
1781 | uint64_t id = msg.u.discarded_events.session_id; | |
1782 | uint64_t key = msg.u.discarded_events.channel_key; | |
1783 | ||
1784 | DBG("UST consumer discarded events command for session id %" | |
1785 | PRIu64, id); | |
1786 | rcu_read_lock(); | |
1787 | pthread_mutex_lock(&consumer_data.lock); | |
1788 | ||
1789 | ht = consumer_data.stream_list_ht; | |
1790 | ||
1791 | /* | |
1792 | * We only need a reference to the channel, but they are not | |
1793 | * directly indexed, so we just use the first matching stream | |
1794 | * to extract the information we need, we default to 0 if not | |
1795 | * found (no events are dropped if the channel is not yet in | |
1796 | * use). | |
1797 | */ | |
beb59458 | 1798 | discarded_events = 0; |
fb83fe64 JD |
1799 | cds_lfht_for_each_entry_duplicate(ht->ht, |
1800 | ht->hash_fct(&id, lttng_ht_seed), | |
1801 | ht->match_fct, &id, | |
1802 | &iter.iter, stream, node_session_id.node) { | |
1803 | if (stream->chan->key == key) { | |
beb59458 | 1804 | discarded_events = stream->chan->discarded_events; |
fb83fe64 JD |
1805 | break; |
1806 | } | |
1807 | } | |
1808 | pthread_mutex_unlock(&consumer_data.lock); | |
1809 | rcu_read_unlock(); | |
1810 | ||
1811 | DBG("UST consumer discarded events command for session id %" | |
1812 | PRIu64 ", channel key %" PRIu64, id, key); | |
1813 | ||
1814 | health_code_update(); | |
1815 | ||
1816 | /* Send back returned value to session daemon */ | |
beb59458 | 1817 | ret = lttcomm_send_unix_sock(sock, &discarded_events, sizeof(discarded_events)); |
fb83fe64 JD |
1818 | if (ret < 0) { |
1819 | PERROR("send discarded events"); | |
1820 | goto error_fatal; | |
1821 | } | |
1822 | ||
1823 | break; | |
1824 | } | |
1825 | case LTTNG_CONSUMER_LOST_PACKETS: | |
1826 | { | |
9a06e8d4 JG |
1827 | int ret; |
1828 | uint64_t lost_packets; | |
fb83fe64 JD |
1829 | struct lttng_ht_iter iter; |
1830 | struct lttng_ht *ht; | |
1831 | struct lttng_consumer_stream *stream; | |
1832 | uint64_t id = msg.u.lost_packets.session_id; | |
1833 | uint64_t key = msg.u.lost_packets.channel_key; | |
1834 | ||
1835 | DBG("UST consumer lost packets command for session id %" | |
1836 | PRIu64, id); | |
1837 | rcu_read_lock(); | |
1838 | pthread_mutex_lock(&consumer_data.lock); | |
1839 | ||
1840 | ht = consumer_data.stream_list_ht; | |
1841 | ||
1842 | /* | |
1843 | * We only need a reference to the channel, but they are not | |
1844 | * directly indexed, so we just use the first matching stream | |
1845 | * to extract the information we need, we default to 0 if not | |
1846 | * found (no packets lost if the channel is not yet in use). | |
1847 | */ | |
9a06e8d4 | 1848 | lost_packets = 0; |
fb83fe64 JD |
1849 | cds_lfht_for_each_entry_duplicate(ht->ht, |
1850 | ht->hash_fct(&id, lttng_ht_seed), | |
1851 | ht->match_fct, &id, | |
1852 | &iter.iter, stream, node_session_id.node) { | |
1853 | if (stream->chan->key == key) { | |
9a06e8d4 | 1854 | lost_packets = stream->chan->lost_packets; |
fb83fe64 JD |
1855 | break; |
1856 | } | |
1857 | } | |
1858 | pthread_mutex_unlock(&consumer_data.lock); | |
1859 | rcu_read_unlock(); | |
1860 | ||
1861 | DBG("UST consumer lost packets command for session id %" | |
1862 | PRIu64 ", channel key %" PRIu64, id, key); | |
1863 | ||
1864 | health_code_update(); | |
1865 | ||
1866 | /* Send back returned value to session daemon */ | |
9a06e8d4 JG |
1867 | ret = lttcomm_send_unix_sock(sock, &lost_packets, |
1868 | sizeof(lost_packets)); | |
fb83fe64 JD |
1869 | if (ret < 0) { |
1870 | PERROR("send lost packets"); | |
1871 | goto error_fatal; | |
1872 | } | |
1873 | ||
1874 | break; | |
1875 | } | |
b3530820 JG |
1876 | case LTTNG_CONSUMER_SET_CHANNEL_MONITOR_PIPE: |
1877 | { | |
1878 | int channel_monitor_pipe; | |
1879 | ||
1880 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1881 | /* Successfully received the command's type. */ | |
1882 | ret = consumer_send_status_msg(sock, ret_code); | |
1883 | if (ret < 0) { | |
1884 | goto error_fatal; | |
1885 | } | |
1886 | ||
1887 | ret = lttcomm_recv_fds_unix_sock(sock, &channel_monitor_pipe, | |
1888 | 1); | |
1889 | if (ret != sizeof(channel_monitor_pipe)) { | |
1890 | ERR("Failed to receive channel monitor pipe"); | |
1891 | goto error_fatal; | |
1892 | } | |
1893 | ||
1894 | DBG("Received channel monitor pipe (%d)", channel_monitor_pipe); | |
1895 | ret = consumer_timer_thread_set_channel_monitor_pipe( | |
1896 | channel_monitor_pipe); | |
1897 | if (!ret) { | |
1898 | int flags; | |
1899 | ||
1900 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1901 | /* Set the pipe as non-blocking. */ | |
1902 | ret = fcntl(channel_monitor_pipe, F_GETFL, 0); | |
1903 | if (ret == -1) { | |
1904 | PERROR("fcntl get flags of the channel monitoring pipe"); | |
1905 | goto error_fatal; | |
1906 | } | |
1907 | flags = ret; | |
1908 | ||
1909 | ret = fcntl(channel_monitor_pipe, F_SETFL, | |
1910 | flags | O_NONBLOCK); | |
1911 | if (ret == -1) { | |
1912 | PERROR("fcntl set O_NONBLOCK flag of the channel monitoring pipe"); | |
1913 | goto error_fatal; | |
1914 | } | |
1915 | DBG("Channel monitor pipe set as non-blocking"); | |
1916 | } else { | |
1917 | ret_code = LTTCOMM_CONSUMERD_ALREADY_SET; | |
1918 | } | |
1919 | goto end_msg_sessiond; | |
1920 | } | |
00fb02ac JD |
1921 | case LTTNG_CONSUMER_ROTATE_RENAME: |
1922 | { | |
1923 | DBG("Consumer rename session %" PRIu64 " after rotation", | |
1924 | msg.u.rotate_rename.session_id); | |
1925 | ret = lttng_consumer_rotate_rename(msg.u.rotate_rename.old_path, | |
1926 | msg.u.rotate_rename.new_path, | |
1927 | msg.u.rotate_rename.uid, | |
1928 | msg.u.rotate_rename.gid, | |
1929 | msg.u.rotate_rename.relayd_id); | |
1930 | if (ret < 0) { | |
1931 | ERR("Rotate rename failed"); | |
1932 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
1933 | } | |
1934 | ||
1935 | health_code_update(); | |
1936 | ||
1937 | ret = consumer_send_status_msg(sock, ret_code); | |
1938 | if (ret < 0) { | |
1939 | /* Somehow, the session daemon is not responding anymore. */ | |
1940 | goto end_nosignal; | |
1941 | } | |
1942 | break; | |
1943 | } | |
a1ae2ea5 JD |
1944 | case LTTNG_CONSUMER_MKDIR: |
1945 | { | |
1946 | DBG("Consumer mkdir %s in session %" PRIu64, | |
1947 | msg.u.mkdir.path, | |
1948 | msg.u.mkdir.session_id); | |
1949 | ret = lttng_consumer_mkdir(msg.u.mkdir.path, | |
1950 | msg.u.mkdir.uid, | |
1951 | msg.u.mkdir.gid, | |
1952 | msg.u.mkdir.relayd_id); | |
1953 | if (ret < 0) { | |
1954 | ERR("consumer mkdir failed"); | |
1955 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
1956 | } | |
1957 | ||
1958 | health_code_update(); | |
1959 | ||
1960 | ret = consumer_send_status_msg(sock, ret_code); | |
1961 | if (ret < 0) { | |
1962 | /* Somehow, the session daemon is not responding anymore. */ | |
1963 | goto end_nosignal; | |
1964 | } | |
1965 | break; | |
1966 | } | |
3bd1e081 MD |
1967 | default: |
1968 | break; | |
1969 | } | |
3f8e211f | 1970 | |
3bd1e081 | 1971 | end_nosignal: |
b0b335c8 | 1972 | rcu_read_unlock(); |
4cbc1a04 | 1973 | |
9ce5646a MD |
1974 | health_code_update(); |
1975 | ||
4cbc1a04 DG |
1976 | /* |
1977 | * Return 1 to indicate success since the 0 value can be a socket | |
1978 | * shutdown during the recv() or send() call. | |
1979 | */ | |
1980 | return 1; | |
ffe60014 DG |
1981 | |
1982 | end_msg_sessiond: | |
1983 | /* | |
1984 | * The returned value here is not useful since either way we'll return 1 to | |
1985 | * the caller because the session daemon socket management is done | |
1986 | * elsewhere. Returning a negative code or 0 will shutdown the consumer. | |
1987 | */ | |
489f70e9 MD |
1988 | ret = consumer_send_status_msg(sock, ret_code); |
1989 | if (ret < 0) { | |
1990 | goto error_fatal; | |
1991 | } | |
ffe60014 | 1992 | rcu_read_unlock(); |
9ce5646a MD |
1993 | |
1994 | health_code_update(); | |
1995 | ||
ffe60014 DG |
1996 | return 1; |
1997 | end_channel_error: | |
1998 | if (channel) { | |
1999 | /* | |
2000 | * Free channel here since no one has a reference to it. We don't | |
2001 | * free after that because a stream can store this pointer. | |
2002 | */ | |
2003 | destroy_channel(channel); | |
2004 | } | |
2005 | /* We have to send a status channel message indicating an error. */ | |
2006 | ret = consumer_send_status_channel(sock, NULL); | |
2007 | if (ret < 0) { | |
2008 | /* Stop everything if session daemon can not be notified. */ | |
2009 | goto error_fatal; | |
2010 | } | |
2011 | rcu_read_unlock(); | |
9ce5646a MD |
2012 | |
2013 | health_code_update(); | |
2014 | ||
ffe60014 DG |
2015 | return 1; |
2016 | error_fatal: | |
2017 | rcu_read_unlock(); | |
2018 | /* This will issue a consumer stop. */ | |
2019 | return -1; | |
3bd1e081 MD |
2020 | } |
2021 | ||
ffe60014 DG |
2022 | /* |
2023 | * Wrapper over the mmap() read offset from ust-ctl library. Since this can be | |
2024 | * compiled out, we isolate it in this library. | |
2025 | */ | |
2026 | int lttng_ustctl_get_mmap_read_offset(struct lttng_consumer_stream *stream, | |
2027 | unsigned long *off) | |
3bd1e081 | 2028 | { |
ffe60014 DG |
2029 | assert(stream); |
2030 | assert(stream->ustream); | |
b5c5fc29 | 2031 | |
ffe60014 | 2032 | return ustctl_get_mmap_read_offset(stream->ustream, off); |
3bd1e081 MD |
2033 | } |
2034 | ||
ffe60014 DG |
2035 | /* |
2036 | * Wrapper over the mmap() read offset from ust-ctl library. Since this can be | |
2037 | * compiled out, we isolate it in this library. | |
2038 | */ | |
2039 | void *lttng_ustctl_get_mmap_base(struct lttng_consumer_stream *stream) | |
d056b477 | 2040 | { |
ffe60014 DG |
2041 | assert(stream); |
2042 | assert(stream->ustream); | |
2043 | ||
2044 | return ustctl_get_mmap_base(stream->ustream); | |
d056b477 MD |
2045 | } |
2046 | ||
fc6d7a51 JD |
2047 | void lttng_ustctl_flush_buffer(struct lttng_consumer_stream *stream, |
2048 | int producer_active) | |
2049 | { | |
2050 | assert(stream); | |
2051 | assert(stream->ustream); | |
2052 | ||
2053 | ustctl_flush_buffer(stream->ustream, producer_active); | |
2054 | } | |
2055 | ||
ffe60014 | 2056 | /* |
e9404c27 | 2057 | * Take a snapshot for a specific stream. |
ffe60014 DG |
2058 | * |
2059 | * Returns 0 on success, < 0 on error | |
2060 | */ | |
2061 | int lttng_ustconsumer_take_snapshot(struct lttng_consumer_stream *stream) | |
3bd1e081 | 2062 | { |
ffe60014 DG |
2063 | assert(stream); |
2064 | assert(stream->ustream); | |
2065 | ||
2066 | return ustctl_snapshot(stream->ustream); | |
3bd1e081 MD |
2067 | } |
2068 | ||
e9404c27 JG |
2069 | /* |
2070 | * Sample consumed and produced positions for a specific stream. | |
2071 | * | |
2072 | * Returns 0 on success, < 0 on error. | |
2073 | */ | |
2074 | int lttng_ustconsumer_sample_snapshot_positions( | |
2075 | struct lttng_consumer_stream *stream) | |
2076 | { | |
2077 | assert(stream); | |
2078 | assert(stream->ustream); | |
2079 | ||
2080 | return ustctl_snapshot_sample_positions(stream->ustream); | |
2081 | } | |
2082 | ||
ffe60014 DG |
2083 | /* |
2084 | * Get the produced position | |
2085 | * | |
2086 | * Returns 0 on success, < 0 on error | |
2087 | */ | |
2088 | int lttng_ustconsumer_get_produced_snapshot( | |
2089 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
3bd1e081 | 2090 | { |
ffe60014 DG |
2091 | assert(stream); |
2092 | assert(stream->ustream); | |
2093 | assert(pos); | |
7a57cf92 | 2094 | |
ffe60014 DG |
2095 | return ustctl_snapshot_get_produced(stream->ustream, pos); |
2096 | } | |
7a57cf92 | 2097 | |
10a50311 JD |
2098 | /* |
2099 | * Get the consumed position | |
2100 | * | |
2101 | * Returns 0 on success, < 0 on error | |
2102 | */ | |
2103 | int lttng_ustconsumer_get_consumed_snapshot( | |
2104 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
2105 | { | |
2106 | assert(stream); | |
2107 | assert(stream->ustream); | |
2108 | assert(pos); | |
2109 | ||
2110 | return ustctl_snapshot_get_consumed(stream->ustream, pos); | |
2111 | } | |
2112 | ||
84a182ce DG |
2113 | void lttng_ustconsumer_flush_buffer(struct lttng_consumer_stream *stream, |
2114 | int producer) | |
2115 | { | |
2116 | assert(stream); | |
2117 | assert(stream->ustream); | |
2118 | ||
2119 | ustctl_flush_buffer(stream->ustream, producer); | |
2120 | } | |
2121 | ||
2122 | int lttng_ustconsumer_get_current_timestamp( | |
2123 | struct lttng_consumer_stream *stream, uint64_t *ts) | |
2124 | { | |
2125 | assert(stream); | |
2126 | assert(stream->ustream); | |
2127 | assert(ts); | |
2128 | ||
2129 | return ustctl_get_current_timestamp(stream->ustream, ts); | |
2130 | } | |
2131 | ||
fb83fe64 JD |
2132 | int lttng_ustconsumer_get_sequence_number( |
2133 | struct lttng_consumer_stream *stream, uint64_t *seq) | |
2134 | { | |
2135 | assert(stream); | |
2136 | assert(stream->ustream); | |
2137 | assert(seq); | |
2138 | ||
2139 | return ustctl_get_sequence_number(stream->ustream, seq); | |
2140 | } | |
2141 | ||
ffe60014 | 2142 | /* |
0dd01979 | 2143 | * Called when the stream signals the consumer that it has hung up. |
ffe60014 DG |
2144 | */ |
2145 | void lttng_ustconsumer_on_stream_hangup(struct lttng_consumer_stream *stream) | |
2146 | { | |
2147 | assert(stream); | |
2148 | assert(stream->ustream); | |
2c1dd183 | 2149 | |
0dd01979 MD |
2150 | pthread_mutex_lock(&stream->lock); |
2151 | if (!stream->quiescent) { | |
2152 | ustctl_flush_buffer(stream->ustream, 0); | |
2153 | stream->quiescent = true; | |
2154 | } | |
2155 | pthread_mutex_unlock(&stream->lock); | |
ffe60014 DG |
2156 | stream->hangup_flush_done = 1; |
2157 | } | |
ee77a7b0 | 2158 | |
ffe60014 DG |
2159 | void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan) |
2160 | { | |
4628484a MD |
2161 | int i; |
2162 | ||
ffe60014 DG |
2163 | assert(chan); |
2164 | assert(chan->uchan); | |
e316aad5 | 2165 | |
ea88ca2a MD |
2166 | if (chan->switch_timer_enabled == 1) { |
2167 | consumer_timer_switch_stop(chan); | |
2168 | } | |
4628484a MD |
2169 | for (i = 0; i < chan->nr_stream_fds; i++) { |
2170 | int ret; | |
2171 | ||
2172 | ret = close(chan->stream_fds[i]); | |
2173 | if (ret) { | |
2174 | PERROR("close"); | |
2175 | } | |
2176 | if (chan->shm_path[0]) { | |
2177 | char shm_path[PATH_MAX]; | |
2178 | ||
2179 | ret = get_stream_shm_path(shm_path, chan->shm_path, i); | |
2180 | if (ret) { | |
2181 | ERR("Cannot get stream shm path"); | |
2182 | } | |
2183 | ret = run_as_unlink(shm_path, chan->uid, chan->gid); | |
2184 | if (ret) { | |
4628484a MD |
2185 | PERROR("unlink %s", shm_path); |
2186 | } | |
2187 | } | |
2188 | } | |
3bd1e081 MD |
2189 | } |
2190 | ||
b83e03c4 MD |
2191 | void lttng_ustconsumer_free_channel(struct lttng_consumer_channel *chan) |
2192 | { | |
2193 | assert(chan); | |
2194 | assert(chan->uchan); | |
2195 | ||
2196 | consumer_metadata_cache_destroy(chan); | |
2197 | ustctl_destroy_channel(chan->uchan); | |
ea853771 JR |
2198 | /* Try to rmdir all directories under shm_path root. */ |
2199 | if (chan->root_shm_path[0]) { | |
602766ec | 2200 | (void) run_as_rmdir_recursive(chan->root_shm_path, |
ea853771 JR |
2201 | chan->uid, chan->gid); |
2202 | } | |
b83e03c4 MD |
2203 | free(chan->stream_fds); |
2204 | } | |
2205 | ||
3bd1e081 MD |
2206 | void lttng_ustconsumer_del_stream(struct lttng_consumer_stream *stream) |
2207 | { | |
ffe60014 DG |
2208 | assert(stream); |
2209 | assert(stream->ustream); | |
d41f73b7 | 2210 | |
ea88ca2a MD |
2211 | if (stream->chan->switch_timer_enabled == 1) { |
2212 | consumer_timer_switch_stop(stream->chan); | |
2213 | } | |
ffe60014 DG |
2214 | ustctl_destroy_stream(stream->ustream); |
2215 | } | |
d41f73b7 | 2216 | |
6d574024 DG |
2217 | int lttng_ustconsumer_get_wakeup_fd(struct lttng_consumer_stream *stream) |
2218 | { | |
2219 | assert(stream); | |
2220 | assert(stream->ustream); | |
2221 | ||
2222 | return ustctl_stream_get_wakeup_fd(stream->ustream); | |
2223 | } | |
2224 | ||
2225 | int lttng_ustconsumer_close_wakeup_fd(struct lttng_consumer_stream *stream) | |
2226 | { | |
2227 | assert(stream); | |
2228 | assert(stream->ustream); | |
2229 | ||
2230 | return ustctl_stream_close_wakeup_fd(stream->ustream); | |
2231 | } | |
2232 | ||
309167d2 JD |
2233 | /* |
2234 | * Populate index values of a UST stream. Values are set in big endian order. | |
2235 | * | |
2236 | * Return 0 on success or else a negative value. | |
2237 | */ | |
50adc264 | 2238 | static int get_index_values(struct ctf_packet_index *index, |
309167d2 JD |
2239 | struct ustctl_consumer_stream *ustream) |
2240 | { | |
2241 | int ret; | |
2242 | ||
2243 | ret = ustctl_get_timestamp_begin(ustream, &index->timestamp_begin); | |
2244 | if (ret < 0) { | |
2245 | PERROR("ustctl_get_timestamp_begin"); | |
2246 | goto error; | |
2247 | } | |
2248 | index->timestamp_begin = htobe64(index->timestamp_begin); | |
2249 | ||
2250 | ret = ustctl_get_timestamp_end(ustream, &index->timestamp_end); | |
2251 | if (ret < 0) { | |
2252 | PERROR("ustctl_get_timestamp_end"); | |
2253 | goto error; | |
2254 | } | |
2255 | index->timestamp_end = htobe64(index->timestamp_end); | |
2256 | ||
2257 | ret = ustctl_get_events_discarded(ustream, &index->events_discarded); | |
2258 | if (ret < 0) { | |
2259 | PERROR("ustctl_get_events_discarded"); | |
2260 | goto error; | |
2261 | } | |
2262 | index->events_discarded = htobe64(index->events_discarded); | |
2263 | ||
2264 | ret = ustctl_get_content_size(ustream, &index->content_size); | |
2265 | if (ret < 0) { | |
2266 | PERROR("ustctl_get_content_size"); | |
2267 | goto error; | |
2268 | } | |
2269 | index->content_size = htobe64(index->content_size); | |
2270 | ||
2271 | ret = ustctl_get_packet_size(ustream, &index->packet_size); | |
2272 | if (ret < 0) { | |
2273 | PERROR("ustctl_get_packet_size"); | |
2274 | goto error; | |
2275 | } | |
2276 | index->packet_size = htobe64(index->packet_size); | |
2277 | ||
2278 | ret = ustctl_get_stream_id(ustream, &index->stream_id); | |
2279 | if (ret < 0) { | |
2280 | PERROR("ustctl_get_stream_id"); | |
2281 | goto error; | |
2282 | } | |
2283 | index->stream_id = htobe64(index->stream_id); | |
2284 | ||
234cd636 JD |
2285 | ret = ustctl_get_instance_id(ustream, &index->stream_instance_id); |
2286 | if (ret < 0) { | |
2287 | PERROR("ustctl_get_instance_id"); | |
2288 | goto error; | |
2289 | } | |
2290 | index->stream_instance_id = htobe64(index->stream_instance_id); | |
2291 | ||
2292 | ret = ustctl_get_sequence_number(ustream, &index->packet_seq_num); | |
2293 | if (ret < 0) { | |
2294 | PERROR("ustctl_get_sequence_number"); | |
2295 | goto error; | |
2296 | } | |
2297 | index->packet_seq_num = htobe64(index->packet_seq_num); | |
2298 | ||
309167d2 JD |
2299 | error: |
2300 | return ret; | |
2301 | } | |
2302 | ||
93ec662e JD |
2303 | static |
2304 | void metadata_stream_reset_cache(struct lttng_consumer_stream *stream, | |
2305 | struct consumer_metadata_cache *cache) | |
2306 | { | |
2307 | DBG("Metadata stream update to version %" PRIu64, | |
2308 | cache->version); | |
2309 | stream->ust_metadata_pushed = 0; | |
2310 | stream->metadata_version = cache->version; | |
2311 | stream->reset_metadata_flag = 1; | |
2312 | } | |
2313 | ||
2314 | /* | |
2315 | * Check if the version of the metadata stream and metadata cache match. | |
2316 | * If the cache got updated, reset the metadata stream. | |
2317 | * The stream lock and metadata cache lock MUST be held. | |
2318 | * Return 0 on success, a negative value on error. | |
2319 | */ | |
2320 | static | |
2321 | int metadata_stream_check_version(struct lttng_consumer_stream *stream) | |
2322 | { | |
2323 | int ret = 0; | |
2324 | struct consumer_metadata_cache *cache = stream->chan->metadata_cache; | |
2325 | ||
2326 | if (cache->version == stream->metadata_version) { | |
2327 | goto end; | |
2328 | } | |
2329 | metadata_stream_reset_cache(stream, cache); | |
2330 | ||
2331 | end: | |
2332 | return ret; | |
2333 | } | |
2334 | ||
94d49140 JD |
2335 | /* |
2336 | * Write up to one packet from the metadata cache to the channel. | |
2337 | * | |
2338 | * Returns the number of bytes pushed in the cache, or a negative value | |
2339 | * on error. | |
2340 | */ | |
2341 | static | |
2342 | int commit_one_metadata_packet(struct lttng_consumer_stream *stream) | |
2343 | { | |
2344 | ssize_t write_len; | |
2345 | int ret; | |
2346 | ||
2347 | pthread_mutex_lock(&stream->chan->metadata_cache->lock); | |
93ec662e JD |
2348 | ret = metadata_stream_check_version(stream); |
2349 | if (ret < 0) { | |
2350 | goto end; | |
2351 | } | |
c585821b | 2352 | if (stream->chan->metadata_cache->max_offset |
94d49140 JD |
2353 | == stream->ust_metadata_pushed) { |
2354 | ret = 0; | |
2355 | goto end; | |
2356 | } | |
2357 | ||
2358 | write_len = ustctl_write_one_packet_to_channel(stream->chan->uchan, | |
2359 | &stream->chan->metadata_cache->data[stream->ust_metadata_pushed], | |
c585821b | 2360 | stream->chan->metadata_cache->max_offset |
94d49140 JD |
2361 | - stream->ust_metadata_pushed); |
2362 | assert(write_len != 0); | |
2363 | if (write_len < 0) { | |
2364 | ERR("Writing one metadata packet"); | |
2365 | ret = -1; | |
2366 | goto end; | |
2367 | } | |
2368 | stream->ust_metadata_pushed += write_len; | |
2369 | ||
c585821b | 2370 | assert(stream->chan->metadata_cache->max_offset >= |
94d49140 JD |
2371 | stream->ust_metadata_pushed); |
2372 | ret = write_len; | |
2373 | ||
2374 | end: | |
2375 | pthread_mutex_unlock(&stream->chan->metadata_cache->lock); | |
2376 | return ret; | |
2377 | } | |
2378 | ||
309167d2 | 2379 | |
94d49140 JD |
2380 | /* |
2381 | * Sync metadata meaning request them to the session daemon and snapshot to the | |
2382 | * metadata thread can consumer them. | |
2383 | * | |
c585821b MD |
2384 | * Metadata stream lock is held here, but we need to release it when |
2385 | * interacting with sessiond, else we cause a deadlock with live | |
2386 | * awaiting on metadata to be pushed out. | |
94d49140 JD |
2387 | * |
2388 | * Return 0 if new metadatda is available, EAGAIN if the metadata stream | |
2389 | * is empty or a negative value on error. | |
2390 | */ | |
2391 | int lttng_ustconsumer_sync_metadata(struct lttng_consumer_local_data *ctx, | |
2392 | struct lttng_consumer_stream *metadata) | |
2393 | { | |
2394 | int ret; | |
2395 | int retry = 0; | |
2396 | ||
2397 | assert(ctx); | |
2398 | assert(metadata); | |
2399 | ||
c585821b | 2400 | pthread_mutex_unlock(&metadata->lock); |
94d49140 JD |
2401 | /* |
2402 | * Request metadata from the sessiond, but don't wait for the flush | |
2403 | * because we locked the metadata thread. | |
2404 | */ | |
2405 | ret = lttng_ustconsumer_request_metadata(ctx, metadata->chan, 0, 0); | |
1caeb2eb | 2406 | pthread_mutex_lock(&metadata->lock); |
94d49140 JD |
2407 | if (ret < 0) { |
2408 | goto end; | |
2409 | } | |
2410 | ||
2411 | ret = commit_one_metadata_packet(metadata); | |
2412 | if (ret <= 0) { | |
2413 | goto end; | |
2414 | } else if (ret > 0) { | |
2415 | retry = 1; | |
2416 | } | |
2417 | ||
2418 | ustctl_flush_buffer(metadata->ustream, 1); | |
2419 | ret = ustctl_snapshot(metadata->ustream); | |
2420 | if (ret < 0) { | |
2421 | if (errno != EAGAIN) { | |
2422 | ERR("Sync metadata, taking UST snapshot"); | |
2423 | goto end; | |
2424 | } | |
2425 | DBG("No new metadata when syncing them."); | |
2426 | /* No new metadata, exit. */ | |
2427 | ret = ENODATA; | |
2428 | goto end; | |
2429 | } | |
2430 | ||
2431 | /* | |
2432 | * After this flush, we still need to extract metadata. | |
2433 | */ | |
2434 | if (retry) { | |
2435 | ret = EAGAIN; | |
2436 | } | |
2437 | ||
2438 | end: | |
2439 | return ret; | |
2440 | } | |
2441 | ||
02b3d176 DG |
2442 | /* |
2443 | * Return 0 on success else a negative value. | |
2444 | */ | |
2445 | static int notify_if_more_data(struct lttng_consumer_stream *stream, | |
2446 | struct lttng_consumer_local_data *ctx) | |
2447 | { | |
2448 | int ret; | |
2449 | struct ustctl_consumer_stream *ustream; | |
2450 | ||
2451 | assert(stream); | |
2452 | assert(ctx); | |
2453 | ||
2454 | ustream = stream->ustream; | |
2455 | ||
2456 | /* | |
2457 | * First, we are going to check if there is a new subbuffer available | |
2458 | * before reading the stream wait_fd. | |
2459 | */ | |
2460 | /* Get the next subbuffer */ | |
2461 | ret = ustctl_get_next_subbuf(ustream); | |
2462 | if (ret) { | |
2463 | /* No more data found, flag the stream. */ | |
2464 | stream->has_data = 0; | |
2465 | ret = 0; | |
2466 | goto end; | |
2467 | } | |
2468 | ||
5420e5db | 2469 | ret = ustctl_put_subbuf(ustream); |
02b3d176 DG |
2470 | assert(!ret); |
2471 | ||
2472 | /* This stream still has data. Flag it and wake up the data thread. */ | |
2473 | stream->has_data = 1; | |
2474 | ||
2475 | if (stream->monitor && !stream->hangup_flush_done && !ctx->has_wakeup) { | |
2476 | ssize_t writelen; | |
2477 | ||
2478 | writelen = lttng_pipe_write(ctx->consumer_wakeup_pipe, "!", 1); | |
2479 | if (writelen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) { | |
2480 | ret = writelen; | |
2481 | goto end; | |
2482 | } | |
2483 | ||
2484 | /* The wake up pipe has been notified. */ | |
2485 | ctx->has_wakeup = 1; | |
2486 | } | |
2487 | ret = 0; | |
2488 | ||
2489 | end: | |
2490 | return ret; | |
2491 | } | |
2492 | ||
fb83fe64 JD |
2493 | static |
2494 | int update_stream_stats(struct lttng_consumer_stream *stream) | |
2495 | { | |
2496 | int ret; | |
2497 | uint64_t seq, discarded; | |
2498 | ||
2499 | ret = ustctl_get_sequence_number(stream->ustream, &seq); | |
2500 | if (ret < 0) { | |
2501 | PERROR("ustctl_get_sequence_number"); | |
2502 | goto end; | |
2503 | } | |
2504 | /* | |
2505 | * Start the sequence when we extract the first packet in case we don't | |
2506 | * start at 0 (for example if a consumer is not connected to the | |
2507 | * session immediately after the beginning). | |
2508 | */ | |
2509 | if (stream->last_sequence_number == -1ULL) { | |
2510 | stream->last_sequence_number = seq; | |
2511 | } else if (seq > stream->last_sequence_number) { | |
2512 | stream->chan->lost_packets += seq - | |
2513 | stream->last_sequence_number - 1; | |
2514 | } else { | |
2515 | /* seq <= last_sequence_number */ | |
2516 | ERR("Sequence number inconsistent : prev = %" PRIu64 | |
2517 | ", current = %" PRIu64, | |
2518 | stream->last_sequence_number, seq); | |
2519 | ret = -1; | |
2520 | goto end; | |
2521 | } | |
2522 | stream->last_sequence_number = seq; | |
2523 | ||
2524 | ret = ustctl_get_events_discarded(stream->ustream, &discarded); | |
2525 | if (ret < 0) { | |
2526 | PERROR("kernctl_get_events_discarded"); | |
2527 | goto end; | |
2528 | } | |
2529 | if (discarded < stream->last_discarded_events) { | |
2530 | /* | |
83f4233d MJ |
2531 | * Overflow has occurred. We assume only one wrap-around |
2532 | * has occurred. | |
fb83fe64 JD |
2533 | */ |
2534 | stream->chan->discarded_events += | |
2535 | (1ULL << (CAA_BITS_PER_LONG - 1)) - | |
2536 | stream->last_discarded_events + discarded; | |
2537 | } else { | |
2538 | stream->chan->discarded_events += discarded - | |
2539 | stream->last_discarded_events; | |
2540 | } | |
2541 | stream->last_discarded_events = discarded; | |
2542 | ret = 0; | |
2543 | ||
2544 | end: | |
2545 | return ret; | |
2546 | } | |
2547 | ||
94d49140 JD |
2548 | /* |
2549 | * Read subbuffer from the given stream. | |
2550 | * | |
2551 | * Stream lock MUST be acquired. | |
2552 | * | |
2553 | * Return 0 on success else a negative value. | |
2554 | */ | |
d41f73b7 MD |
2555 | int lttng_ustconsumer_read_subbuffer(struct lttng_consumer_stream *stream, |
2556 | struct lttng_consumer_local_data *ctx) | |
2557 | { | |
1d4dfdef | 2558 | unsigned long len, subbuf_size, padding; |
1c20f0e2 | 2559 | int err, write_index = 1; |
d41f73b7 | 2560 | long ret = 0; |
ffe60014 | 2561 | struct ustctl_consumer_stream *ustream; |
50adc264 | 2562 | struct ctf_packet_index index; |
ffe60014 DG |
2563 | |
2564 | assert(stream); | |
2565 | assert(stream->ustream); | |
2566 | assert(ctx); | |
d41f73b7 | 2567 | |
3eb914c0 | 2568 | DBG("In UST read_subbuffer (wait_fd: %d, name: %s)", stream->wait_fd, |
ffe60014 DG |
2569 | stream->name); |
2570 | ||
2571 | /* Ease our life for what's next. */ | |
2572 | ustream = stream->ustream; | |
d41f73b7 | 2573 | |
6cd525e8 | 2574 | /* |
02b3d176 DG |
2575 | * We can consume the 1 byte written into the wait_fd by UST. Don't trigger |
2576 | * error if we cannot read this one byte (read returns 0), or if the error | |
2577 | * is EAGAIN or EWOULDBLOCK. | |
2578 | * | |
2579 | * This is only done when the stream is monitored by a thread, before the | |
2580 | * flush is done after a hangup and if the stream is not flagged with data | |
2581 | * since there might be nothing to consume in the wait fd but still have | |
2582 | * data available flagged by the consumer wake up pipe. | |
6cd525e8 | 2583 | */ |
02b3d176 DG |
2584 | if (stream->monitor && !stream->hangup_flush_done && !stream->has_data) { |
2585 | char dummy; | |
c617c0c6 MD |
2586 | ssize_t readlen; |
2587 | ||
6cd525e8 MD |
2588 | readlen = lttng_read(stream->wait_fd, &dummy, 1); |
2589 | if (readlen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) { | |
effcf122 MD |
2590 | ret = readlen; |
2591 | goto end; | |
2592 | } | |
d41f73b7 MD |
2593 | } |
2594 | ||
04ef1097 | 2595 | retry: |
d41f73b7 | 2596 | /* Get the next subbuffer */ |
ffe60014 | 2597 | err = ustctl_get_next_subbuf(ustream); |
d41f73b7 | 2598 | if (err != 0) { |
04ef1097 MD |
2599 | /* |
2600 | * Populate metadata info if the existing info has | |
2601 | * already been read. | |
2602 | */ | |
2603 | if (stream->metadata_flag) { | |
94d49140 JD |
2604 | ret = commit_one_metadata_packet(stream); |
2605 | if (ret <= 0) { | |
04ef1097 MD |
2606 | goto end; |
2607 | } | |
04ef1097 MD |
2608 | ustctl_flush_buffer(stream->ustream, 1); |
2609 | goto retry; | |
2610 | } | |
2611 | ||
1d4dfdef | 2612 | ret = err; /* ustctl_get_next_subbuf returns negative, caller expect positive. */ |
d41f73b7 MD |
2613 | /* |
2614 | * This is a debug message even for single-threaded consumer, | |
2615 | * because poll() have more relaxed criterions than get subbuf, | |
2616 | * so get_subbuf may fail for short race windows where poll() | |
2617 | * would issue wakeups. | |
2618 | */ | |
2619 | DBG("Reserving sub buffer failed (everything is normal, " | |
ffe60014 | 2620 | "it is due to concurrency) [ret: %d]", err); |
d41f73b7 MD |
2621 | goto end; |
2622 | } | |
ffe60014 | 2623 | assert(stream->chan->output == CONSUMER_CHANNEL_MMAP); |
309167d2 | 2624 | |
1c20f0e2 | 2625 | if (!stream->metadata_flag) { |
309167d2 JD |
2626 | index.offset = htobe64(stream->out_fd_offset); |
2627 | ret = get_index_values(&index, ustream); | |
2628 | if (ret < 0) { | |
7b87473d MD |
2629 | err = ustctl_put_subbuf(ustream); |
2630 | assert(err == 0); | |
309167d2 JD |
2631 | goto end; |
2632 | } | |
fb83fe64 JD |
2633 | |
2634 | /* Update the stream's sequence and discarded events count. */ | |
2635 | ret = update_stream_stats(stream); | |
2636 | if (ret < 0) { | |
2637 | PERROR("kernctl_get_events_discarded"); | |
7b87473d MD |
2638 | err = ustctl_put_subbuf(ustream); |
2639 | assert(err == 0); | |
fb83fe64 JD |
2640 | goto end; |
2641 | } | |
1c20f0e2 JD |
2642 | } else { |
2643 | write_index = 0; | |
309167d2 JD |
2644 | } |
2645 | ||
1d4dfdef | 2646 | /* Get the full padded subbuffer size */ |
ffe60014 | 2647 | err = ustctl_get_padded_subbuf_size(ustream, &len); |
effcf122 | 2648 | assert(err == 0); |
1d4dfdef DG |
2649 | |
2650 | /* Get subbuffer data size (without padding) */ | |
ffe60014 | 2651 | err = ustctl_get_subbuf_size(ustream, &subbuf_size); |
1d4dfdef DG |
2652 | assert(err == 0); |
2653 | ||
2654 | /* Make sure we don't get a subbuffer size bigger than the padded */ | |
2655 | assert(len >= subbuf_size); | |
2656 | ||
2657 | padding = len - subbuf_size; | |
d41f73b7 | 2658 | /* write the subbuffer to the tracefile */ |
309167d2 | 2659 | ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, padding, &index); |
91dfef6e DG |
2660 | /* |
2661 | * The mmap operation should write subbuf_size amount of data when network | |
2662 | * streaming or the full padding (len) size when we are _not_ streaming. | |
2663 | */ | |
d88aee68 DG |
2664 | if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) || |
2665 | (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) { | |
d41f73b7 | 2666 | /* |
91dfef6e | 2667 | * Display the error but continue processing to try to release the |
c5c45efa DG |
2668 | * subbuffer. This is a DBG statement since any unexpected kill or |
2669 | * signal, the application gets unregistered, relayd gets closed or | |
2670 | * anything that affects the buffer lifetime will trigger this error. | |
2671 | * So, for the sake of the user, don't print this error since it can | |
2672 | * happen and it is OK with the code flow. | |
d41f73b7 | 2673 | */ |
c5c45efa | 2674 | DBG("Error writing to tracefile " |
8fd623e0 | 2675 | "(ret: %ld != len: %lu != subbuf_size: %lu)", |
91dfef6e | 2676 | ret, len, subbuf_size); |
309167d2 | 2677 | write_index = 0; |
d41f73b7 | 2678 | } |
ffe60014 | 2679 | err = ustctl_put_next_subbuf(ustream); |
effcf122 | 2680 | assert(err == 0); |
331744e3 | 2681 | |
02b3d176 DG |
2682 | /* |
2683 | * This will consumer the byte on the wait_fd if and only if there is not | |
2684 | * next subbuffer to be acquired. | |
2685 | */ | |
2686 | if (!stream->metadata_flag) { | |
2687 | ret = notify_if_more_data(stream, ctx); | |
2688 | if (ret < 0) { | |
2689 | goto end; | |
2690 | } | |
2691 | } | |
2692 | ||
309167d2 | 2693 | /* Write index if needed. */ |
1c20f0e2 JD |
2694 | if (!write_index) { |
2695 | goto end; | |
2696 | } | |
2697 | ||
94d49140 JD |
2698 | if (stream->chan->live_timer_interval && !stream->metadata_flag) { |
2699 | /* | |
2700 | * In live, block until all the metadata is sent. | |
2701 | */ | |
c585821b MD |
2702 | pthread_mutex_lock(&stream->metadata_timer_lock); |
2703 | assert(!stream->missed_metadata_flush); | |
2704 | stream->waiting_on_metadata = true; | |
2705 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
2706 | ||
94d49140 | 2707 | err = consumer_stream_sync_metadata(ctx, stream->session_id); |
c585821b MD |
2708 | |
2709 | pthread_mutex_lock(&stream->metadata_timer_lock); | |
2710 | stream->waiting_on_metadata = false; | |
2711 | if (stream->missed_metadata_flush) { | |
2712 | stream->missed_metadata_flush = false; | |
2713 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
2714 | (void) consumer_flush_ust_index(stream); | |
2715 | } else { | |
2716 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
2717 | } | |
2718 | ||
94d49140 JD |
2719 | if (err < 0) { |
2720 | goto end; | |
2721 | } | |
2722 | } | |
2723 | ||
1c20f0e2 JD |
2724 | assert(!stream->metadata_flag); |
2725 | err = consumer_stream_write_index(stream, &index); | |
2726 | if (err < 0) { | |
2727 | goto end; | |
309167d2 JD |
2728 | } |
2729 | ||
d41f73b7 MD |
2730 | end: |
2731 | return ret; | |
2732 | } | |
2733 | ||
ffe60014 DG |
2734 | /* |
2735 | * Called when a stream is created. | |
fe4477ee JD |
2736 | * |
2737 | * Return 0 on success or else a negative value. | |
ffe60014 | 2738 | */ |
d41f73b7 MD |
2739 | int lttng_ustconsumer_on_recv_stream(struct lttng_consumer_stream *stream) |
2740 | { | |
fe4477ee JD |
2741 | int ret; |
2742 | ||
10a50311 JD |
2743 | assert(stream); |
2744 | ||
fe4477ee | 2745 | /* Don't create anything if this is set for streaming. */ |
10a50311 | 2746 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor) { |
fe4477ee JD |
2747 | ret = utils_create_stream_file(stream->chan->pathname, stream->name, |
2748 | stream->chan->tracefile_size, stream->tracefile_count_current, | |
309167d2 | 2749 | stream->uid, stream->gid, NULL); |
fe4477ee JD |
2750 | if (ret < 0) { |
2751 | goto error; | |
2752 | } | |
2753 | stream->out_fd = ret; | |
2754 | stream->tracefile_size_current = 0; | |
309167d2 JD |
2755 | |
2756 | if (!stream->metadata_flag) { | |
f8f3885c MD |
2757 | struct lttng_index_file *index_file; |
2758 | ||
2759 | index_file = lttng_index_file_create(stream->chan->pathname, | |
309167d2 JD |
2760 | stream->name, stream->uid, stream->gid, |
2761 | stream->chan->tracefile_size, | |
f8f3885c MD |
2762 | stream->tracefile_count_current, |
2763 | CTF_INDEX_MAJOR, CTF_INDEX_MINOR); | |
2764 | if (!index_file) { | |
309167d2 JD |
2765 | goto error; |
2766 | } | |
1b47ae58 | 2767 | assert(!stream->index_file); |
f8f3885c | 2768 | stream->index_file = index_file; |
309167d2 | 2769 | } |
fe4477ee JD |
2770 | } |
2771 | ret = 0; | |
2772 | ||
2773 | error: | |
2774 | return ret; | |
d41f73b7 | 2775 | } |
ca22feea DG |
2776 | |
2777 | /* | |
2778 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
2779 | * stream. Consumer data lock MUST be acquired before calling this function |
2780 | * and the stream lock. | |
ca22feea | 2781 | * |
6d805429 | 2782 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
2783 | * data is available for trace viewer reading. |
2784 | */ | |
6d805429 | 2785 | int lttng_ustconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
2786 | { |
2787 | int ret; | |
2788 | ||
2789 | assert(stream); | |
ffe60014 | 2790 | assert(stream->ustream); |
ca22feea | 2791 | |
6d805429 | 2792 | DBG("UST consumer checking data pending"); |
c8f59ee5 | 2793 | |
ca6b395f MD |
2794 | if (stream->endpoint_status != CONSUMER_ENDPOINT_ACTIVE) { |
2795 | ret = 0; | |
2796 | goto end; | |
2797 | } | |
2798 | ||
04ef1097 | 2799 | if (stream->chan->type == CONSUMER_CHANNEL_TYPE_METADATA) { |
e6ee4eab DG |
2800 | uint64_t contiguous, pushed; |
2801 | ||
2802 | /* Ease our life a bit. */ | |
c585821b | 2803 | contiguous = stream->chan->metadata_cache->max_offset; |
e6ee4eab DG |
2804 | pushed = stream->ust_metadata_pushed; |
2805 | ||
04ef1097 MD |
2806 | /* |
2807 | * We can simply check whether all contiguously available data | |
2808 | * has been pushed to the ring buffer, since the push operation | |
2809 | * is performed within get_next_subbuf(), and because both | |
2810 | * get_next_subbuf() and put_next_subbuf() are issued atomically | |
2811 | * thanks to the stream lock within | |
2812 | * lttng_ustconsumer_read_subbuffer(). This basically means that | |
2813 | * whetnever ust_metadata_pushed is incremented, the associated | |
2814 | * metadata has been consumed from the metadata stream. | |
2815 | */ | |
2816 | DBG("UST consumer metadata pending check: contiguous %" PRIu64 " vs pushed %" PRIu64, | |
e6ee4eab | 2817 | contiguous, pushed); |
aa01b94c | 2818 | assert(((int64_t) (contiguous - pushed)) >= 0); |
e6ee4eab | 2819 | if ((contiguous != pushed) || |
6acdf328 | 2820 | (((int64_t) contiguous - pushed) > 0 || contiguous == 0)) { |
04ef1097 MD |
2821 | ret = 1; /* Data is pending */ |
2822 | goto end; | |
2823 | } | |
2824 | } else { | |
2825 | ret = ustctl_get_next_subbuf(stream->ustream); | |
2826 | if (ret == 0) { | |
2827 | /* | |
2828 | * There is still data so let's put back this | |
2829 | * subbuffer. | |
2830 | */ | |
2831 | ret = ustctl_put_subbuf(stream->ustream); | |
2832 | assert(ret == 0); | |
2833 | ret = 1; /* Data is pending */ | |
2834 | goto end; | |
2835 | } | |
ca22feea DG |
2836 | } |
2837 | ||
6d805429 DG |
2838 | /* Data is NOT pending so ready to be read. */ |
2839 | ret = 0; | |
ca22feea | 2840 | |
6efae65e DG |
2841 | end: |
2842 | return ret; | |
ca22feea | 2843 | } |
d88aee68 | 2844 | |
6d574024 DG |
2845 | /* |
2846 | * Stop a given metadata channel timer if enabled and close the wait fd which | |
2847 | * is the poll pipe of the metadata stream. | |
2848 | * | |
2849 | * This MUST be called with the metadata channel acquired. | |
2850 | */ | |
2851 | void lttng_ustconsumer_close_metadata(struct lttng_consumer_channel *metadata) | |
2852 | { | |
2853 | int ret; | |
2854 | ||
2855 | assert(metadata); | |
2856 | assert(metadata->type == CONSUMER_CHANNEL_TYPE_METADATA); | |
2857 | ||
2858 | DBG("Closing metadata channel key %" PRIu64, metadata->key); | |
2859 | ||
2860 | if (metadata->switch_timer_enabled == 1) { | |
2861 | consumer_timer_switch_stop(metadata); | |
2862 | } | |
2863 | ||
2864 | if (!metadata->metadata_stream) { | |
2865 | goto end; | |
2866 | } | |
2867 | ||
2868 | /* | |
2869 | * Closing write side so the thread monitoring the stream wakes up if any | |
2870 | * and clean the metadata stream. | |
2871 | */ | |
2872 | if (metadata->metadata_stream->ust_metadata_poll_pipe[1] >= 0) { | |
2873 | ret = close(metadata->metadata_stream->ust_metadata_poll_pipe[1]); | |
2874 | if (ret < 0) { | |
2875 | PERROR("closing metadata pipe write side"); | |
2876 | } | |
2877 | metadata->metadata_stream->ust_metadata_poll_pipe[1] = -1; | |
2878 | } | |
2879 | ||
2880 | end: | |
2881 | return; | |
2882 | } | |
2883 | ||
d88aee68 DG |
2884 | /* |
2885 | * Close every metadata stream wait fd of the metadata hash table. This | |
2886 | * function MUST be used very carefully so not to run into a race between the | |
2887 | * metadata thread handling streams and this function closing their wait fd. | |
2888 | * | |
2889 | * For UST, this is used when the session daemon hangs up. Its the metadata | |
2890 | * producer so calling this is safe because we are assured that no state change | |
2891 | * can occur in the metadata thread for the streams in the hash table. | |
2892 | */ | |
6d574024 | 2893 | void lttng_ustconsumer_close_all_metadata(struct lttng_ht *metadata_ht) |
d88aee68 | 2894 | { |
d88aee68 DG |
2895 | struct lttng_ht_iter iter; |
2896 | struct lttng_consumer_stream *stream; | |
2897 | ||
2898 | assert(metadata_ht); | |
2899 | assert(metadata_ht->ht); | |
2900 | ||
2901 | DBG("UST consumer closing all metadata streams"); | |
2902 | ||
2903 | rcu_read_lock(); | |
2904 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, | |
2905 | node.node) { | |
9ce5646a MD |
2906 | |
2907 | health_code_update(); | |
2908 | ||
be2b50c7 | 2909 | pthread_mutex_lock(&stream->chan->lock); |
6d574024 | 2910 | lttng_ustconsumer_close_metadata(stream->chan); |
be2b50c7 DG |
2911 | pthread_mutex_unlock(&stream->chan->lock); |
2912 | ||
d88aee68 DG |
2913 | } |
2914 | rcu_read_unlock(); | |
2915 | } | |
d8ef542d MD |
2916 | |
2917 | void lttng_ustconsumer_close_stream_wakeup(struct lttng_consumer_stream *stream) | |
2918 | { | |
2919 | int ret; | |
2920 | ||
2921 | ret = ustctl_stream_close_wakeup_fd(stream->ustream); | |
2922 | if (ret < 0) { | |
2923 | ERR("Unable to close wakeup fd"); | |
2924 | } | |
2925 | } | |
331744e3 | 2926 | |
f666ae70 MD |
2927 | /* |
2928 | * Please refer to consumer-timer.c before adding any lock within this | |
2929 | * function or any of its callees. Timers have a very strict locking | |
2930 | * semantic with respect to teardown. Failure to respect this semantic | |
2931 | * introduces deadlocks. | |
c585821b MD |
2932 | * |
2933 | * DON'T hold the metadata lock when calling this function, else this | |
2934 | * can cause deadlock involving consumer awaiting for metadata to be | |
2935 | * pushed out due to concurrent interaction with the session daemon. | |
f666ae70 | 2936 | */ |
331744e3 | 2937 | int lttng_ustconsumer_request_metadata(struct lttng_consumer_local_data *ctx, |
94d49140 | 2938 | struct lttng_consumer_channel *channel, int timer, int wait) |
331744e3 JD |
2939 | { |
2940 | struct lttcomm_metadata_request_msg request; | |
2941 | struct lttcomm_consumer_msg msg; | |
0c759fc9 | 2942 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
93ec662e | 2943 | uint64_t len, key, offset, version; |
331744e3 JD |
2944 | int ret; |
2945 | ||
2946 | assert(channel); | |
2947 | assert(channel->metadata_cache); | |
2948 | ||
53efb85a MD |
2949 | memset(&request, 0, sizeof(request)); |
2950 | ||
331744e3 JD |
2951 | /* send the metadata request to sessiond */ |
2952 | switch (consumer_data.type) { | |
2953 | case LTTNG_CONSUMER64_UST: | |
2954 | request.bits_per_long = 64; | |
2955 | break; | |
2956 | case LTTNG_CONSUMER32_UST: | |
2957 | request.bits_per_long = 32; | |
2958 | break; | |
2959 | default: | |
2960 | request.bits_per_long = 0; | |
2961 | break; | |
2962 | } | |
2963 | ||
2964 | request.session_id = channel->session_id; | |
1950109e | 2965 | request.session_id_per_pid = channel->session_id_per_pid; |
567eb353 DG |
2966 | /* |
2967 | * Request the application UID here so the metadata of that application can | |
2968 | * be sent back. The channel UID corresponds to the user UID of the session | |
2969 | * used for the rights on the stream file(s). | |
2970 | */ | |
2971 | request.uid = channel->ust_app_uid; | |
331744e3 | 2972 | request.key = channel->key; |
567eb353 | 2973 | |
1950109e | 2974 | DBG("Sending metadata request to sessiond, session id %" PRIu64 |
567eb353 DG |
2975 | ", per-pid %" PRIu64 ", app UID %u and channek key %" PRIu64, |
2976 | request.session_id, request.session_id_per_pid, request.uid, | |
2977 | request.key); | |
331744e3 | 2978 | |
75d83e50 | 2979 | pthread_mutex_lock(&ctx->metadata_socket_lock); |
9ce5646a MD |
2980 | |
2981 | health_code_update(); | |
2982 | ||
331744e3 JD |
2983 | ret = lttcomm_send_unix_sock(ctx->consumer_metadata_socket, &request, |
2984 | sizeof(request)); | |
2985 | if (ret < 0) { | |
2986 | ERR("Asking metadata to sessiond"); | |
2987 | goto end; | |
2988 | } | |
2989 | ||
9ce5646a MD |
2990 | health_code_update(); |
2991 | ||
331744e3 JD |
2992 | /* Receive the metadata from sessiond */ |
2993 | ret = lttcomm_recv_unix_sock(ctx->consumer_metadata_socket, &msg, | |
2994 | sizeof(msg)); | |
2995 | if (ret != sizeof(msg)) { | |
8fd623e0 | 2996 | DBG("Consumer received unexpected message size %d (expects %zu)", |
331744e3 JD |
2997 | ret, sizeof(msg)); |
2998 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); | |
2999 | /* | |
3000 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
3001 | * since the caller handles this. | |
3002 | */ | |
3003 | goto end; | |
3004 | } | |
3005 | ||
9ce5646a MD |
3006 | health_code_update(); |
3007 | ||
331744e3 JD |
3008 | if (msg.cmd_type == LTTNG_ERR_UND) { |
3009 | /* No registry found */ | |
3010 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, | |
3011 | ret_code); | |
3012 | ret = 0; | |
3013 | goto end; | |
3014 | } else if (msg.cmd_type != LTTNG_CONSUMER_PUSH_METADATA) { | |
3015 | ERR("Unexpected cmd_type received %d", msg.cmd_type); | |
3016 | ret = -1; | |
3017 | goto end; | |
3018 | } | |
3019 | ||
3020 | len = msg.u.push_metadata.len; | |
3021 | key = msg.u.push_metadata.key; | |
3022 | offset = msg.u.push_metadata.target_offset; | |
93ec662e | 3023 | version = msg.u.push_metadata.version; |
331744e3 JD |
3024 | |
3025 | assert(key == channel->key); | |
3026 | if (len == 0) { | |
3027 | DBG("No new metadata to receive for key %" PRIu64, key); | |
3028 | } | |
3029 | ||
9ce5646a MD |
3030 | health_code_update(); |
3031 | ||
331744e3 JD |
3032 | /* Tell session daemon we are ready to receive the metadata. */ |
3033 | ret = consumer_send_status_msg(ctx->consumer_metadata_socket, | |
0c759fc9 | 3034 | LTTCOMM_CONSUMERD_SUCCESS); |
331744e3 JD |
3035 | if (ret < 0 || len == 0) { |
3036 | /* | |
3037 | * Somehow, the session daemon is not responding anymore or there is | |
3038 | * nothing to receive. | |
3039 | */ | |
3040 | goto end; | |
3041 | } | |
3042 | ||
9ce5646a MD |
3043 | health_code_update(); |
3044 | ||
1eb682be | 3045 | ret = lttng_ustconsumer_recv_metadata(ctx->consumer_metadata_socket, |
93ec662e | 3046 | key, offset, len, version, channel, timer, wait); |
1eb682be | 3047 | if (ret >= 0) { |
f2a444f1 DG |
3048 | /* |
3049 | * Only send the status msg if the sessiond is alive meaning a positive | |
3050 | * ret code. | |
3051 | */ | |
1eb682be | 3052 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, ret); |
f2a444f1 | 3053 | } |
331744e3 JD |
3054 | ret = 0; |
3055 | ||
3056 | end: | |
9ce5646a MD |
3057 | health_code_update(); |
3058 | ||
75d83e50 | 3059 | pthread_mutex_unlock(&ctx->metadata_socket_lock); |
331744e3 JD |
3060 | return ret; |
3061 | } | |
70190e1c DG |
3062 | |
3063 | /* | |
3064 | * Return the ustctl call for the get stream id. | |
3065 | */ | |
3066 | int lttng_ustconsumer_get_stream_id(struct lttng_consumer_stream *stream, | |
3067 | uint64_t *stream_id) | |
3068 | { | |
3069 | assert(stream); | |
3070 | assert(stream_id); | |
3071 | ||
3072 | return ustctl_get_stream_id(stream->ustream, stream_id); | |
3073 | } |