Commit | Line | Data |
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3bd1e081 MD |
1 | /* |
2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> | |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
4 | * | |
d14d33bf AM |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
3bd1e081 MD |
8 | * |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
d14d33bf AM |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
3bd1e081 MD |
17 | */ |
18 | ||
6c1c0768 | 19 | #define _LGPL_SOURCE |
3bd1e081 | 20 | #include <assert.h> |
f02e1e8a | 21 | #include <lttng/ust-ctl.h> |
3bd1e081 MD |
22 | #include <poll.h> |
23 | #include <pthread.h> | |
24 | #include <stdlib.h> | |
25 | #include <string.h> | |
26 | #include <sys/mman.h> | |
27 | #include <sys/socket.h> | |
dbb5dfe6 | 28 | #include <sys/stat.h> |
3bd1e081 | 29 | #include <sys/types.h> |
77c7c900 | 30 | #include <inttypes.h> |
3bd1e081 | 31 | #include <unistd.h> |
ffe60014 | 32 | #include <urcu/list.h> |
331744e3 | 33 | #include <signal.h> |
0857097f | 34 | |
51a9e1c7 | 35 | #include <bin/lttng-consumerd/health-consumerd.h> |
990570ed | 36 | #include <common/common.h> |
10a8a223 | 37 | #include <common/sessiond-comm/sessiond-comm.h> |
00e2e675 | 38 | #include <common/relayd/relayd.h> |
dbb5dfe6 | 39 | #include <common/compat/fcntl.h> |
f263b7fd | 40 | #include <common/compat/endian.h> |
c8fea79c JR |
41 | #include <common/consumer/consumer-metadata-cache.h> |
42 | #include <common/consumer/consumer-stream.h> | |
43 | #include <common/consumer/consumer-timer.h> | |
fe4477ee | 44 | #include <common/utils.h> |
309167d2 | 45 | #include <common/index/index.h> |
10a8a223 DG |
46 | |
47 | #include "ust-consumer.h" | |
3bd1e081 | 48 | |
45863397 | 49 | #define INT_MAX_STR_LEN 12 /* includes \0 */ |
4628484a | 50 | |
3bd1e081 MD |
51 | extern struct lttng_consumer_global_data consumer_data; |
52 | extern int consumer_poll_timeout; | |
53 | extern volatile int consumer_quit; | |
54 | ||
55 | /* | |
ffe60014 DG |
56 | * Free channel object and all streams associated with it. This MUST be used |
57 | * only and only if the channel has _NEVER_ been added to the global channel | |
58 | * hash table. | |
3bd1e081 | 59 | */ |
ffe60014 | 60 | static void destroy_channel(struct lttng_consumer_channel *channel) |
3bd1e081 | 61 | { |
ffe60014 DG |
62 | struct lttng_consumer_stream *stream, *stmp; |
63 | ||
64 | assert(channel); | |
65 | ||
66 | DBG("UST consumer cleaning stream list"); | |
67 | ||
68 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
69 | send_node) { | |
9ce5646a MD |
70 | |
71 | health_code_update(); | |
72 | ||
ffe60014 DG |
73 | cds_list_del(&stream->send_node); |
74 | ustctl_destroy_stream(stream->ustream); | |
75 | free(stream); | |
76 | } | |
77 | ||
78 | /* | |
79 | * If a channel is available meaning that was created before the streams | |
80 | * were, delete it. | |
81 | */ | |
82 | if (channel->uchan) { | |
83 | lttng_ustconsumer_del_channel(channel); | |
b83e03c4 | 84 | lttng_ustconsumer_free_channel(channel); |
ffe60014 DG |
85 | } |
86 | free(channel); | |
87 | } | |
3bd1e081 MD |
88 | |
89 | /* | |
ffe60014 | 90 | * Add channel to internal consumer state. |
3bd1e081 | 91 | * |
ffe60014 | 92 | * Returns 0 on success or else a negative value. |
3bd1e081 | 93 | */ |
ffe60014 DG |
94 | static int add_channel(struct lttng_consumer_channel *channel, |
95 | struct lttng_consumer_local_data *ctx) | |
3bd1e081 MD |
96 | { |
97 | int ret = 0; | |
98 | ||
ffe60014 DG |
99 | assert(channel); |
100 | assert(ctx); | |
101 | ||
102 | if (ctx->on_recv_channel != NULL) { | |
103 | ret = ctx->on_recv_channel(channel); | |
104 | if (ret == 0) { | |
d8ef542d | 105 | ret = consumer_add_channel(channel, ctx); |
ffe60014 DG |
106 | } else if (ret < 0) { |
107 | /* Most likely an ENOMEM. */ | |
108 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
109 | goto error; | |
110 | } | |
111 | } else { | |
d8ef542d | 112 | ret = consumer_add_channel(channel, ctx); |
3bd1e081 MD |
113 | } |
114 | ||
d88aee68 | 115 | DBG("UST consumer channel added (key: %" PRIu64 ")", channel->key); |
ffe60014 DG |
116 | |
117 | error: | |
3bd1e081 MD |
118 | return ret; |
119 | } | |
120 | ||
121 | /* | |
ffe60014 DG |
122 | * Allocate and return a consumer channel object. |
123 | */ | |
124 | static struct lttng_consumer_channel *allocate_channel(uint64_t session_id, | |
125 | const char *pathname, const char *name, uid_t uid, gid_t gid, | |
da009f2c | 126 | uint64_t relayd_id, uint64_t key, enum lttng_event_output output, |
2bba9e53 | 127 | uint64_t tracefile_size, uint64_t tracefile_count, |
ecc48a90 | 128 | uint64_t session_id_per_pid, unsigned int monitor, |
d7ba1388 | 129 | unsigned int live_timer_interval, |
3d071855 | 130 | const char *root_shm_path, const char *shm_path) |
ffe60014 DG |
131 | { |
132 | assert(pathname); | |
133 | assert(name); | |
134 | ||
1950109e JD |
135 | return consumer_allocate_channel(key, session_id, pathname, name, uid, |
136 | gid, relayd_id, output, tracefile_size, | |
d7ba1388 | 137 | tracefile_count, session_id_per_pid, monitor, |
3d071855 | 138 | live_timer_interval, root_shm_path, shm_path); |
ffe60014 DG |
139 | } |
140 | ||
141 | /* | |
142 | * Allocate and return a consumer stream object. If _alloc_ret is not NULL, the | |
143 | * error value if applicable is set in it else it is kept untouched. | |
3bd1e081 | 144 | * |
ffe60014 | 145 | * Return NULL on error else the newly allocated stream object. |
3bd1e081 | 146 | */ |
ffe60014 DG |
147 | static struct lttng_consumer_stream *allocate_stream(int cpu, int key, |
148 | struct lttng_consumer_channel *channel, | |
149 | struct lttng_consumer_local_data *ctx, int *_alloc_ret) | |
150 | { | |
151 | int alloc_ret; | |
152 | struct lttng_consumer_stream *stream = NULL; | |
153 | ||
154 | assert(channel); | |
155 | assert(ctx); | |
156 | ||
157 | stream = consumer_allocate_stream(channel->key, | |
158 | key, | |
159 | LTTNG_CONSUMER_ACTIVE_STREAM, | |
160 | channel->name, | |
161 | channel->uid, | |
162 | channel->gid, | |
163 | channel->relayd_id, | |
164 | channel->session_id, | |
165 | cpu, | |
166 | &alloc_ret, | |
4891ece8 DG |
167 | channel->type, |
168 | channel->monitor); | |
ffe60014 DG |
169 | if (stream == NULL) { |
170 | switch (alloc_ret) { | |
171 | case -ENOENT: | |
172 | /* | |
173 | * We could not find the channel. Can happen if cpu hotplug | |
174 | * happens while tearing down. | |
175 | */ | |
176 | DBG3("Could not find channel"); | |
177 | break; | |
178 | case -ENOMEM: | |
179 | case -EINVAL: | |
180 | default: | |
181 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
182 | break; | |
183 | } | |
184 | goto error; | |
185 | } | |
186 | ||
187 | stream->chan = channel; | |
188 | ||
189 | error: | |
190 | if (_alloc_ret) { | |
191 | *_alloc_ret = alloc_ret; | |
192 | } | |
193 | return stream; | |
194 | } | |
195 | ||
196 | /* | |
197 | * Send the given stream pointer to the corresponding thread. | |
198 | * | |
199 | * Returns 0 on success else a negative value. | |
200 | */ | |
201 | static int send_stream_to_thread(struct lttng_consumer_stream *stream, | |
202 | struct lttng_consumer_local_data *ctx) | |
203 | { | |
dae10966 DG |
204 | int ret; |
205 | struct lttng_pipe *stream_pipe; | |
ffe60014 DG |
206 | |
207 | /* Get the right pipe where the stream will be sent. */ | |
208 | if (stream->metadata_flag) { | |
5ab66908 MD |
209 | ret = consumer_add_metadata_stream(stream); |
210 | if (ret) { | |
211 | ERR("Consumer add metadata stream %" PRIu64 " failed.", | |
212 | stream->key); | |
213 | goto error; | |
214 | } | |
dae10966 | 215 | stream_pipe = ctx->consumer_metadata_pipe; |
ffe60014 | 216 | } else { |
5ab66908 MD |
217 | ret = consumer_add_data_stream(stream); |
218 | if (ret) { | |
219 | ERR("Consumer add stream %" PRIu64 " failed.", | |
220 | stream->key); | |
221 | goto error; | |
222 | } | |
dae10966 | 223 | stream_pipe = ctx->consumer_data_pipe; |
ffe60014 DG |
224 | } |
225 | ||
5ab66908 MD |
226 | /* |
227 | * From this point on, the stream's ownership has been moved away from | |
228 | * the channel and becomes globally visible. | |
229 | */ | |
230 | stream->globally_visible = 1; | |
231 | ||
dae10966 | 232 | ret = lttng_pipe_write(stream_pipe, &stream, sizeof(stream)); |
ffe60014 | 233 | if (ret < 0) { |
dae10966 DG |
234 | ERR("Consumer write %s stream to pipe %d", |
235 | stream->metadata_flag ? "metadata" : "data", | |
236 | lttng_pipe_get_writefd(stream_pipe)); | |
5ab66908 MD |
237 | if (stream->metadata_flag) { |
238 | consumer_del_stream_for_metadata(stream); | |
239 | } else { | |
240 | consumer_del_stream_for_data(stream); | |
241 | } | |
ffe60014 | 242 | } |
5ab66908 | 243 | error: |
ffe60014 DG |
244 | return ret; |
245 | } | |
246 | ||
4628484a MD |
247 | static |
248 | int get_stream_shm_path(char *stream_shm_path, const char *shm_path, int cpu) | |
249 | { | |
45863397 | 250 | char cpu_nr[INT_MAX_STR_LEN]; /* int max len */ |
4628484a MD |
251 | int ret; |
252 | ||
253 | strncpy(stream_shm_path, shm_path, PATH_MAX); | |
254 | stream_shm_path[PATH_MAX - 1] = '\0'; | |
45863397 | 255 | ret = snprintf(cpu_nr, INT_MAX_STR_LEN, "%i", cpu); |
67f8cb8d MD |
256 | if (ret < 0) { |
257 | PERROR("snprintf"); | |
4628484a MD |
258 | goto end; |
259 | } | |
260 | strncat(stream_shm_path, cpu_nr, | |
261 | PATH_MAX - strlen(stream_shm_path) - 1); | |
262 | ret = 0; | |
263 | end: | |
264 | return ret; | |
265 | } | |
266 | ||
d88aee68 DG |
267 | /* |
268 | * Create streams for the given channel using liblttng-ust-ctl. | |
269 | * | |
270 | * Return 0 on success else a negative value. | |
271 | */ | |
ffe60014 DG |
272 | static int create_ust_streams(struct lttng_consumer_channel *channel, |
273 | struct lttng_consumer_local_data *ctx) | |
274 | { | |
275 | int ret, cpu = 0; | |
276 | struct ustctl_consumer_stream *ustream; | |
277 | struct lttng_consumer_stream *stream; | |
278 | ||
279 | assert(channel); | |
280 | assert(ctx); | |
281 | ||
282 | /* | |
283 | * While a stream is available from ustctl. When NULL is returned, we've | |
284 | * reached the end of the possible stream for the channel. | |
285 | */ | |
286 | while ((ustream = ustctl_create_stream(channel->uchan, cpu))) { | |
287 | int wait_fd; | |
04ef1097 | 288 | int ust_metadata_pipe[2]; |
ffe60014 | 289 | |
9ce5646a MD |
290 | health_code_update(); |
291 | ||
04ef1097 MD |
292 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && channel->monitor) { |
293 | ret = utils_create_pipe_cloexec_nonblock(ust_metadata_pipe); | |
294 | if (ret < 0) { | |
295 | ERR("Create ust metadata poll pipe"); | |
296 | goto error; | |
297 | } | |
298 | wait_fd = ust_metadata_pipe[0]; | |
299 | } else { | |
300 | wait_fd = ustctl_stream_get_wait_fd(ustream); | |
301 | } | |
ffe60014 DG |
302 | |
303 | /* Allocate consumer stream object. */ | |
304 | stream = allocate_stream(cpu, wait_fd, channel, ctx, &ret); | |
305 | if (!stream) { | |
306 | goto error_alloc; | |
307 | } | |
308 | stream->ustream = ustream; | |
309 | /* | |
310 | * Store it so we can save multiple function calls afterwards since | |
311 | * this value is used heavily in the stream threads. This is UST | |
312 | * specific so this is why it's done after allocation. | |
313 | */ | |
314 | stream->wait_fd = wait_fd; | |
315 | ||
b31398bb DG |
316 | /* |
317 | * Increment channel refcount since the channel reference has now been | |
318 | * assigned in the allocation process above. | |
319 | */ | |
10a50311 JD |
320 | if (stream->chan->monitor) { |
321 | uatomic_inc(&stream->chan->refcount); | |
322 | } | |
b31398bb | 323 | |
ffe60014 DG |
324 | /* |
325 | * Order is important this is why a list is used. On error, the caller | |
326 | * should clean this list. | |
327 | */ | |
328 | cds_list_add_tail(&stream->send_node, &channel->streams.head); | |
329 | ||
330 | ret = ustctl_get_max_subbuf_size(stream->ustream, | |
331 | &stream->max_sb_size); | |
332 | if (ret < 0) { | |
333 | ERR("ustctl_get_max_subbuf_size failed for stream %s", | |
334 | stream->name); | |
335 | goto error; | |
336 | } | |
337 | ||
338 | /* Do actions once stream has been received. */ | |
339 | if (ctx->on_recv_stream) { | |
340 | ret = ctx->on_recv_stream(stream); | |
341 | if (ret < 0) { | |
342 | goto error; | |
343 | } | |
344 | } | |
345 | ||
d88aee68 | 346 | DBG("UST consumer add stream %s (key: %" PRIu64 ") with relayd id %" PRIu64, |
ffe60014 DG |
347 | stream->name, stream->key, stream->relayd_stream_id); |
348 | ||
349 | /* Set next CPU stream. */ | |
350 | channel->streams.count = ++cpu; | |
d88aee68 DG |
351 | |
352 | /* Keep stream reference when creating metadata. */ | |
353 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) { | |
354 | channel->metadata_stream = stream; | |
8de4f941 JG |
355 | if (channel->monitor) { |
356 | /* Set metadata poll pipe if we created one */ | |
357 | memcpy(stream->ust_metadata_poll_pipe, | |
358 | ust_metadata_pipe, | |
359 | sizeof(ust_metadata_pipe)); | |
360 | } | |
d88aee68 | 361 | } |
ffe60014 DG |
362 | } |
363 | ||
364 | return 0; | |
365 | ||
366 | error: | |
367 | error_alloc: | |
368 | return ret; | |
369 | } | |
370 | ||
4628484a MD |
371 | /* |
372 | * create_posix_shm is never called concurrently within a process. | |
373 | */ | |
374 | static | |
375 | int create_posix_shm(void) | |
376 | { | |
377 | char tmp_name[NAME_MAX]; | |
378 | int shmfd, ret; | |
379 | ||
380 | ret = snprintf(tmp_name, NAME_MAX, "/ust-shm-consumer-%d", getpid()); | |
381 | if (ret < 0) { | |
382 | PERROR("snprintf"); | |
383 | return -1; | |
384 | } | |
385 | /* | |
386 | * Allocate shm, and immediately unlink its shm oject, keeping | |
387 | * only the file descriptor as a reference to the object. | |
388 | * We specifically do _not_ use the / at the beginning of the | |
389 | * pathname so that some OS implementations can keep it local to | |
390 | * the process (POSIX leaves this implementation-defined). | |
391 | */ | |
392 | shmfd = shm_open(tmp_name, O_CREAT | O_EXCL | O_RDWR, 0700); | |
393 | if (shmfd < 0) { | |
394 | PERROR("shm_open"); | |
395 | goto error_shm_open; | |
396 | } | |
397 | ret = shm_unlink(tmp_name); | |
398 | if (ret < 0 && errno != ENOENT) { | |
399 | PERROR("shm_unlink"); | |
400 | goto error_shm_release; | |
401 | } | |
402 | return shmfd; | |
403 | ||
404 | error_shm_release: | |
405 | ret = close(shmfd); | |
406 | if (ret) { | |
407 | PERROR("close"); | |
408 | } | |
409 | error_shm_open: | |
410 | return -1; | |
411 | } | |
412 | ||
413 | static int open_ust_stream_fd(struct lttng_consumer_channel *channel, | |
414 | struct ustctl_consumer_channel_attr *attr, | |
415 | int cpu) | |
416 | { | |
417 | char shm_path[PATH_MAX]; | |
418 | int ret; | |
419 | ||
420 | if (!channel->shm_path[0]) { | |
421 | return create_posix_shm(); | |
422 | } | |
423 | ret = get_stream_shm_path(shm_path, channel->shm_path, cpu); | |
424 | if (ret) { | |
425 | goto error_shm_path; | |
426 | } | |
427 | return run_as_open(shm_path, | |
428 | O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR, | |
429 | channel->uid, channel->gid); | |
430 | ||
431 | error_shm_path: | |
432 | return -1; | |
433 | } | |
434 | ||
ffe60014 DG |
435 | /* |
436 | * Create an UST channel with the given attributes and send it to the session | |
437 | * daemon using the ust ctl API. | |
438 | * | |
439 | * Return 0 on success or else a negative value. | |
440 | */ | |
4628484a MD |
441 | static int create_ust_channel(struct lttng_consumer_channel *channel, |
442 | struct ustctl_consumer_channel_attr *attr, | |
443 | struct ustctl_consumer_channel **ust_chanp) | |
ffe60014 | 444 | { |
4628484a MD |
445 | int ret, nr_stream_fds, i, j; |
446 | int *stream_fds; | |
447 | struct ustctl_consumer_channel *ust_channel; | |
ffe60014 | 448 | |
4628484a | 449 | assert(channel); |
ffe60014 | 450 | assert(attr); |
4628484a | 451 | assert(ust_chanp); |
ffe60014 DG |
452 | |
453 | DBG3("Creating channel to ustctl with attr: [overwrite: %d, " | |
454 | "subbuf_size: %" PRIu64 ", num_subbuf: %" PRIu64 ", " | |
455 | "switch_timer_interval: %u, read_timer_interval: %u, " | |
456 | "output: %d, type: %d", attr->overwrite, attr->subbuf_size, | |
457 | attr->num_subbuf, attr->switch_timer_interval, | |
458 | attr->read_timer_interval, attr->output, attr->type); | |
459 | ||
4628484a MD |
460 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) |
461 | nr_stream_fds = 1; | |
462 | else | |
463 | nr_stream_fds = ustctl_get_nr_stream_per_channel(); | |
464 | stream_fds = zmalloc(nr_stream_fds * sizeof(*stream_fds)); | |
465 | if (!stream_fds) { | |
466 | ret = -1; | |
467 | goto error_alloc; | |
468 | } | |
469 | for (i = 0; i < nr_stream_fds; i++) { | |
470 | stream_fds[i] = open_ust_stream_fd(channel, attr, i); | |
471 | if (stream_fds[i] < 0) { | |
472 | ret = -1; | |
473 | goto error_open; | |
474 | } | |
475 | } | |
476 | ust_channel = ustctl_create_channel(attr, stream_fds, nr_stream_fds); | |
477 | if (!ust_channel) { | |
ffe60014 DG |
478 | ret = -1; |
479 | goto error_create; | |
480 | } | |
4628484a MD |
481 | channel->nr_stream_fds = nr_stream_fds; |
482 | channel->stream_fds = stream_fds; | |
483 | *ust_chanp = ust_channel; | |
ffe60014 DG |
484 | |
485 | return 0; | |
486 | ||
487 | error_create: | |
4628484a MD |
488 | error_open: |
489 | for (j = i - 1; j >= 0; j--) { | |
490 | int closeret; | |
491 | ||
492 | closeret = close(stream_fds[j]); | |
493 | if (closeret) { | |
494 | PERROR("close"); | |
495 | } | |
496 | if (channel->shm_path[0]) { | |
497 | char shm_path[PATH_MAX]; | |
498 | ||
499 | closeret = get_stream_shm_path(shm_path, | |
500 | channel->shm_path, j); | |
501 | if (closeret) { | |
502 | ERR("Cannot get stream shm path"); | |
503 | } | |
504 | closeret = run_as_unlink(shm_path, | |
505 | channel->uid, channel->gid); | |
506 | if (closeret) { | |
4628484a MD |
507 | PERROR("unlink %s", shm_path); |
508 | } | |
509 | } | |
510 | } | |
511 | /* Try to rmdir all directories under shm_path root. */ | |
512 | if (channel->root_shm_path[0]) { | |
513 | (void) run_as_recursive_rmdir(channel->root_shm_path, | |
514 | channel->uid, channel->gid); | |
515 | } | |
516 | free(stream_fds); | |
517 | error_alloc: | |
ffe60014 DG |
518 | return ret; |
519 | } | |
520 | ||
d88aee68 DG |
521 | /* |
522 | * Send a single given stream to the session daemon using the sock. | |
523 | * | |
524 | * Return 0 on success else a negative value. | |
525 | */ | |
ffe60014 DG |
526 | static int send_sessiond_stream(int sock, struct lttng_consumer_stream *stream) |
527 | { | |
528 | int ret; | |
529 | ||
530 | assert(stream); | |
531 | assert(sock >= 0); | |
532 | ||
3eb914c0 | 533 | DBG("UST consumer sending stream %" PRIu64 " to sessiond", stream->key); |
ffe60014 DG |
534 | |
535 | /* Send stream to session daemon. */ | |
536 | ret = ustctl_send_stream_to_sessiond(sock, stream->ustream); | |
537 | if (ret < 0) { | |
538 | goto error; | |
539 | } | |
540 | ||
ffe60014 DG |
541 | error: |
542 | return ret; | |
543 | } | |
544 | ||
545 | /* | |
546 | * Send channel to sessiond. | |
547 | * | |
d88aee68 | 548 | * Return 0 on success or else a negative value. |
ffe60014 DG |
549 | */ |
550 | static int send_sessiond_channel(int sock, | |
551 | struct lttng_consumer_channel *channel, | |
552 | struct lttng_consumer_local_data *ctx, int *relayd_error) | |
553 | { | |
0c759fc9 | 554 | int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
ffe60014 | 555 | struct lttng_consumer_stream *stream; |
a4baae1b | 556 | uint64_t net_seq_idx = -1ULL; |
ffe60014 DG |
557 | |
558 | assert(channel); | |
559 | assert(ctx); | |
560 | assert(sock >= 0); | |
561 | ||
562 | DBG("UST consumer sending channel %s to sessiond", channel->name); | |
563 | ||
62285ea4 DG |
564 | if (channel->relayd_id != (uint64_t) -1ULL) { |
565 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
566 | |
567 | health_code_update(); | |
568 | ||
62285ea4 DG |
569 | /* Try to send the stream to the relayd if one is available. */ |
570 | ret = consumer_send_relayd_stream(stream, stream->chan->pathname); | |
571 | if (ret < 0) { | |
572 | /* | |
573 | * Flag that the relayd was the problem here probably due to a | |
574 | * communicaton error on the socket. | |
575 | */ | |
576 | if (relayd_error) { | |
577 | *relayd_error = 1; | |
578 | } | |
725d28b2 | 579 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
ffe60014 | 580 | } |
a4baae1b JD |
581 | if (net_seq_idx == -1ULL) { |
582 | net_seq_idx = stream->net_seq_idx; | |
583 | } | |
584 | } | |
f2a444f1 | 585 | } |
ffe60014 | 586 | |
f2a444f1 DG |
587 | /* Inform sessiond that we are about to send channel and streams. */ |
588 | ret = consumer_send_status_msg(sock, ret_code); | |
0c759fc9 | 589 | if (ret < 0 || ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
f2a444f1 DG |
590 | /* |
591 | * Either the session daemon is not responding or the relayd died so we | |
592 | * stop now. | |
593 | */ | |
594 | goto error; | |
595 | } | |
596 | ||
597 | /* Send channel to sessiond. */ | |
598 | ret = ustctl_send_channel_to_sessiond(sock, channel->uchan); | |
599 | if (ret < 0) { | |
600 | goto error; | |
601 | } | |
602 | ||
603 | ret = ustctl_channel_close_wakeup_fd(channel->uchan); | |
604 | if (ret < 0) { | |
605 | goto error; | |
606 | } | |
607 | ||
608 | /* The channel was sent successfully to the sessiond at this point. */ | |
609 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
610 | |
611 | health_code_update(); | |
612 | ||
ffe60014 DG |
613 | /* Send stream to session daemon. */ |
614 | ret = send_sessiond_stream(sock, stream); | |
615 | if (ret < 0) { | |
616 | goto error; | |
617 | } | |
618 | } | |
619 | ||
620 | /* Tell sessiond there is no more stream. */ | |
621 | ret = ustctl_send_stream_to_sessiond(sock, NULL); | |
622 | if (ret < 0) { | |
623 | goto error; | |
624 | } | |
625 | ||
626 | DBG("UST consumer NULL stream sent to sessiond"); | |
627 | ||
628 | return 0; | |
629 | ||
630 | error: | |
0c759fc9 | 631 | if (ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
f2a444f1 DG |
632 | ret = -1; |
633 | } | |
ffe60014 DG |
634 | return ret; |
635 | } | |
636 | ||
637 | /* | |
638 | * Creates a channel and streams and add the channel it to the channel internal | |
639 | * state. The created stream must ONLY be sent once the GET_CHANNEL command is | |
640 | * received. | |
641 | * | |
642 | * Return 0 on success or else, a negative value is returned and the channel | |
643 | * MUST be destroyed by consumer_del_channel(). | |
644 | */ | |
645 | static int ask_channel(struct lttng_consumer_local_data *ctx, int sock, | |
646 | struct lttng_consumer_channel *channel, | |
647 | struct ustctl_consumer_channel_attr *attr) | |
3bd1e081 MD |
648 | { |
649 | int ret; | |
650 | ||
ffe60014 DG |
651 | assert(ctx); |
652 | assert(channel); | |
653 | assert(attr); | |
654 | ||
655 | /* | |
656 | * This value is still used by the kernel consumer since for the kernel, | |
657 | * the stream ownership is not IN the consumer so we need to have the | |
658 | * number of left stream that needs to be initialized so we can know when | |
659 | * to delete the channel (see consumer.c). | |
660 | * | |
661 | * As for the user space tracer now, the consumer creates and sends the | |
662 | * stream to the session daemon which only sends them to the application | |
663 | * once every stream of a channel is received making this value useless | |
664 | * because we they will be added to the poll thread before the application | |
665 | * receives them. This ensures that a stream can not hang up during | |
666 | * initilization of a channel. | |
667 | */ | |
668 | channel->nb_init_stream_left = 0; | |
669 | ||
670 | /* The reply msg status is handled in the following call. */ | |
4628484a | 671 | ret = create_ust_channel(channel, attr, &channel->uchan); |
ffe60014 | 672 | if (ret < 0) { |
10a50311 | 673 | goto end; |
3bd1e081 MD |
674 | } |
675 | ||
d8ef542d MD |
676 | channel->wait_fd = ustctl_channel_get_wait_fd(channel->uchan); |
677 | ||
10a50311 JD |
678 | /* |
679 | * For the snapshots (no monitor), we create the metadata streams | |
680 | * on demand, not during the channel creation. | |
681 | */ | |
682 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && !channel->monitor) { | |
683 | ret = 0; | |
684 | goto end; | |
685 | } | |
686 | ||
ffe60014 DG |
687 | /* Open all streams for this channel. */ |
688 | ret = create_ust_streams(channel, ctx); | |
689 | if (ret < 0) { | |
10a50311 | 690 | goto end; |
ffe60014 DG |
691 | } |
692 | ||
10a50311 | 693 | end: |
3bd1e081 MD |
694 | return ret; |
695 | } | |
696 | ||
d88aee68 DG |
697 | /* |
698 | * Send all stream of a channel to the right thread handling it. | |
699 | * | |
700 | * On error, return a negative value else 0 on success. | |
701 | */ | |
702 | static int send_streams_to_thread(struct lttng_consumer_channel *channel, | |
703 | struct lttng_consumer_local_data *ctx) | |
704 | { | |
705 | int ret = 0; | |
706 | struct lttng_consumer_stream *stream, *stmp; | |
707 | ||
708 | assert(channel); | |
709 | assert(ctx); | |
710 | ||
711 | /* Send streams to the corresponding thread. */ | |
712 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
713 | send_node) { | |
9ce5646a MD |
714 | |
715 | health_code_update(); | |
716 | ||
d88aee68 DG |
717 | /* Sending the stream to the thread. */ |
718 | ret = send_stream_to_thread(stream, ctx); | |
719 | if (ret < 0) { | |
720 | /* | |
721 | * If we are unable to send the stream to the thread, there is | |
722 | * a big problem so just stop everything. | |
723 | */ | |
5ab66908 MD |
724 | /* Remove node from the channel stream list. */ |
725 | cds_list_del(&stream->send_node); | |
d88aee68 DG |
726 | goto error; |
727 | } | |
728 | ||
729 | /* Remove node from the channel stream list. */ | |
730 | cds_list_del(&stream->send_node); | |
4891ece8 | 731 | |
d88aee68 DG |
732 | } |
733 | ||
734 | error: | |
735 | return ret; | |
736 | } | |
737 | ||
7972aab2 DG |
738 | /* |
739 | * Flush channel's streams using the given key to retrieve the channel. | |
740 | * | |
741 | * Return 0 on success else an LTTng error code. | |
742 | */ | |
743 | static int flush_channel(uint64_t chan_key) | |
744 | { | |
745 | int ret = 0; | |
746 | struct lttng_consumer_channel *channel; | |
747 | struct lttng_consumer_stream *stream; | |
748 | struct lttng_ht *ht; | |
749 | struct lttng_ht_iter iter; | |
750 | ||
8fd623e0 | 751 | DBG("UST consumer flush channel key %" PRIu64, chan_key); |
7972aab2 | 752 | |
a500c257 | 753 | rcu_read_lock(); |
7972aab2 DG |
754 | channel = consumer_find_channel(chan_key); |
755 | if (!channel) { | |
8fd623e0 | 756 | ERR("UST consumer flush channel %" PRIu64 " not found", chan_key); |
7972aab2 DG |
757 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
758 | goto error; | |
759 | } | |
760 | ||
761 | ht = consumer_data.stream_per_chan_id_ht; | |
762 | ||
763 | /* For each stream of the channel id, flush it. */ | |
7972aab2 DG |
764 | cds_lfht_for_each_entry_duplicate(ht->ht, |
765 | ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct, | |
766 | &channel->key, &iter.iter, stream, node_channel_id.node) { | |
9ce5646a MD |
767 | |
768 | health_code_update(); | |
769 | ||
0dd01979 MD |
770 | pthread_mutex_lock(&stream->lock); |
771 | if (!stream->quiescent) { | |
772 | ustctl_flush_buffer(stream->ustream, 0); | |
773 | stream->quiescent = true; | |
774 | } | |
775 | pthread_mutex_unlock(&stream->lock); | |
776 | } | |
777 | error: | |
778 | rcu_read_unlock(); | |
779 | return ret; | |
780 | } | |
781 | ||
782 | /* | |
783 | * Clear quiescent state from channel's streams using the given key to | |
784 | * retrieve the channel. | |
785 | * | |
786 | * Return 0 on success else an LTTng error code. | |
787 | */ | |
788 | static int clear_quiescent_channel(uint64_t chan_key) | |
789 | { | |
790 | int ret = 0; | |
791 | struct lttng_consumer_channel *channel; | |
792 | struct lttng_consumer_stream *stream; | |
793 | struct lttng_ht *ht; | |
794 | struct lttng_ht_iter iter; | |
795 | ||
796 | DBG("UST consumer clear quiescent channel key %" PRIu64, chan_key); | |
797 | ||
798 | rcu_read_lock(); | |
799 | channel = consumer_find_channel(chan_key); | |
800 | if (!channel) { | |
801 | ERR("UST consumer clear quiescent channel %" PRIu64 " not found", chan_key); | |
802 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
803 | goto error; | |
804 | } | |
805 | ||
806 | ht = consumer_data.stream_per_chan_id_ht; | |
807 | ||
808 | /* For each stream of the channel id, clear quiescent state. */ | |
809 | cds_lfht_for_each_entry_duplicate(ht->ht, | |
810 | ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct, | |
811 | &channel->key, &iter.iter, stream, node_channel_id.node) { | |
812 | ||
813 | health_code_update(); | |
814 | ||
815 | pthread_mutex_lock(&stream->lock); | |
816 | stream->quiescent = false; | |
817 | pthread_mutex_unlock(&stream->lock); | |
7972aab2 | 818 | } |
7972aab2 | 819 | error: |
a500c257 | 820 | rcu_read_unlock(); |
7972aab2 DG |
821 | return ret; |
822 | } | |
823 | ||
d88aee68 DG |
824 | /* |
825 | * Close metadata stream wakeup_fd using the given key to retrieve the channel. | |
a500c257 | 826 | * RCU read side lock MUST be acquired before calling this function. |
d88aee68 DG |
827 | * |
828 | * Return 0 on success else an LTTng error code. | |
829 | */ | |
830 | static int close_metadata(uint64_t chan_key) | |
831 | { | |
ea88ca2a | 832 | int ret = 0; |
d88aee68 DG |
833 | struct lttng_consumer_channel *channel; |
834 | ||
8fd623e0 | 835 | DBG("UST consumer close metadata key %" PRIu64, chan_key); |
d88aee68 DG |
836 | |
837 | channel = consumer_find_channel(chan_key); | |
838 | if (!channel) { | |
84cc9aa0 DG |
839 | /* |
840 | * This is possible if the metadata thread has issue a delete because | |
841 | * the endpoint point of the stream hung up. There is no way the | |
842 | * session daemon can know about it thus use a DBG instead of an actual | |
843 | * error. | |
844 | */ | |
845 | DBG("UST consumer close metadata %" PRIu64 " not found", chan_key); | |
d88aee68 DG |
846 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
847 | goto error; | |
848 | } | |
849 | ||
ea88ca2a | 850 | pthread_mutex_lock(&consumer_data.lock); |
a9838785 | 851 | pthread_mutex_lock(&channel->lock); |
73811ecc DG |
852 | |
853 | if (cds_lfht_is_node_deleted(&channel->node.node)) { | |
854 | goto error_unlock; | |
855 | } | |
856 | ||
6d574024 | 857 | lttng_ustconsumer_close_metadata(channel); |
d88aee68 | 858 | |
ea88ca2a | 859 | error_unlock: |
a9838785 | 860 | pthread_mutex_unlock(&channel->lock); |
ea88ca2a | 861 | pthread_mutex_unlock(&consumer_data.lock); |
d88aee68 DG |
862 | error: |
863 | return ret; | |
864 | } | |
865 | ||
866 | /* | |
867 | * RCU read side lock MUST be acquired before calling this function. | |
868 | * | |
869 | * Return 0 on success else an LTTng error code. | |
870 | */ | |
871 | static int setup_metadata(struct lttng_consumer_local_data *ctx, uint64_t key) | |
872 | { | |
873 | int ret; | |
874 | struct lttng_consumer_channel *metadata; | |
875 | ||
8fd623e0 | 876 | DBG("UST consumer setup metadata key %" PRIu64, key); |
d88aee68 DG |
877 | |
878 | metadata = consumer_find_channel(key); | |
879 | if (!metadata) { | |
880 | ERR("UST consumer push metadata %" PRIu64 " not found", key); | |
881 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
10a50311 JD |
882 | goto end; |
883 | } | |
884 | ||
885 | /* | |
886 | * In no monitor mode, the metadata channel has no stream(s) so skip the | |
887 | * ownership transfer to the metadata thread. | |
888 | */ | |
889 | if (!metadata->monitor) { | |
890 | DBG("Metadata channel in no monitor"); | |
891 | ret = 0; | |
892 | goto end; | |
d88aee68 DG |
893 | } |
894 | ||
895 | /* | |
896 | * Send metadata stream to relayd if one available. Availability is | |
897 | * known if the stream is still in the list of the channel. | |
898 | */ | |
899 | if (cds_list_empty(&metadata->streams.head)) { | |
900 | ERR("Metadata channel key %" PRIu64 ", no stream available.", key); | |
901 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
f5a0c9cf | 902 | goto error_no_stream; |
d88aee68 DG |
903 | } |
904 | ||
905 | /* Send metadata stream to relayd if needed. */ | |
62285ea4 DG |
906 | if (metadata->metadata_stream->net_seq_idx != (uint64_t) -1ULL) { |
907 | ret = consumer_send_relayd_stream(metadata->metadata_stream, | |
908 | metadata->pathname); | |
909 | if (ret < 0) { | |
910 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
911 | goto error; | |
912 | } | |
601262d6 JD |
913 | ret = consumer_send_relayd_streams_sent( |
914 | metadata->metadata_stream->net_seq_idx); | |
915 | if (ret < 0) { | |
916 | ret = LTTCOMM_CONSUMERD_RELAYD_FAIL; | |
917 | goto error; | |
918 | } | |
d88aee68 DG |
919 | } |
920 | ||
921 | ret = send_streams_to_thread(metadata, ctx); | |
922 | if (ret < 0) { | |
923 | /* | |
924 | * If we are unable to send the stream to the thread, there is | |
925 | * a big problem so just stop everything. | |
926 | */ | |
927 | ret = LTTCOMM_CONSUMERD_FATAL; | |
928 | goto error; | |
929 | } | |
930 | /* List MUST be empty after or else it could be reused. */ | |
931 | assert(cds_list_empty(&metadata->streams.head)); | |
932 | ||
10a50311 JD |
933 | ret = 0; |
934 | goto end; | |
d88aee68 DG |
935 | |
936 | error: | |
f2a444f1 DG |
937 | /* |
938 | * Delete metadata channel on error. At this point, the metadata stream can | |
939 | * NOT be monitored by the metadata thread thus having the guarantee that | |
940 | * the stream is still in the local stream list of the channel. This call | |
941 | * will make sure to clean that list. | |
942 | */ | |
f5a0c9cf | 943 | consumer_stream_destroy(metadata->metadata_stream, NULL); |
212d67a2 DG |
944 | cds_list_del(&metadata->metadata_stream->send_node); |
945 | metadata->metadata_stream = NULL; | |
f5a0c9cf | 946 | error_no_stream: |
10a50311 JD |
947 | end: |
948 | return ret; | |
949 | } | |
950 | ||
951 | /* | |
952 | * Snapshot the whole metadata. | |
953 | * | |
954 | * Returns 0 on success, < 0 on error | |
955 | */ | |
956 | static int snapshot_metadata(uint64_t key, char *path, uint64_t relayd_id, | |
957 | struct lttng_consumer_local_data *ctx) | |
958 | { | |
959 | int ret = 0; | |
10a50311 JD |
960 | struct lttng_consumer_channel *metadata_channel; |
961 | struct lttng_consumer_stream *metadata_stream; | |
962 | ||
963 | assert(path); | |
964 | assert(ctx); | |
965 | ||
966 | DBG("UST consumer snapshot metadata with key %" PRIu64 " at path %s", | |
967 | key, path); | |
968 | ||
969 | rcu_read_lock(); | |
970 | ||
971 | metadata_channel = consumer_find_channel(key); | |
972 | if (!metadata_channel) { | |
6a00837f MD |
973 | ERR("UST snapshot metadata channel not found for key %" PRIu64, |
974 | key); | |
10a50311 JD |
975 | ret = -1; |
976 | goto error; | |
977 | } | |
978 | assert(!metadata_channel->monitor); | |
979 | ||
9ce5646a MD |
980 | health_code_update(); |
981 | ||
10a50311 JD |
982 | /* |
983 | * Ask the sessiond if we have new metadata waiting and update the | |
984 | * consumer metadata cache. | |
985 | */ | |
94d49140 | 986 | ret = lttng_ustconsumer_request_metadata(ctx, metadata_channel, 0, 1); |
10a50311 JD |
987 | if (ret < 0) { |
988 | goto error; | |
989 | } | |
990 | ||
9ce5646a MD |
991 | health_code_update(); |
992 | ||
10a50311 JD |
993 | /* |
994 | * The metadata stream is NOT created in no monitor mode when the channel | |
995 | * is created on a sessiond ask channel command. | |
996 | */ | |
997 | ret = create_ust_streams(metadata_channel, ctx); | |
998 | if (ret < 0) { | |
999 | goto error; | |
1000 | } | |
1001 | ||
1002 | metadata_stream = metadata_channel->metadata_stream; | |
1003 | assert(metadata_stream); | |
1004 | ||
1005 | if (relayd_id != (uint64_t) -1ULL) { | |
1006 | metadata_stream->net_seq_idx = relayd_id; | |
1007 | ret = consumer_send_relayd_stream(metadata_stream, path); | |
1008 | if (ret < 0) { | |
1009 | goto error_stream; | |
1010 | } | |
1011 | } else { | |
1012 | ret = utils_create_stream_file(path, metadata_stream->name, | |
1013 | metadata_stream->chan->tracefile_size, | |
1014 | metadata_stream->tracefile_count_current, | |
309167d2 | 1015 | metadata_stream->uid, metadata_stream->gid, NULL); |
10a50311 JD |
1016 | if (ret < 0) { |
1017 | goto error_stream; | |
1018 | } | |
1019 | metadata_stream->out_fd = ret; | |
1020 | metadata_stream->tracefile_size_current = 0; | |
1021 | } | |
1022 | ||
04ef1097 | 1023 | do { |
9ce5646a MD |
1024 | health_code_update(); |
1025 | ||
10a50311 JD |
1026 | ret = lttng_consumer_read_subbuffer(metadata_stream, ctx); |
1027 | if (ret < 0) { | |
94d49140 | 1028 | goto error_stream; |
10a50311 | 1029 | } |
04ef1097 | 1030 | } while (ret > 0); |
10a50311 | 1031 | |
10a50311 JD |
1032 | error_stream: |
1033 | /* | |
1034 | * Clean up the stream completly because the next snapshot will use a new | |
1035 | * metadata stream. | |
1036 | */ | |
10a50311 | 1037 | consumer_stream_destroy(metadata_stream, NULL); |
212d67a2 | 1038 | cds_list_del(&metadata_stream->send_node); |
10a50311 JD |
1039 | metadata_channel->metadata_stream = NULL; |
1040 | ||
1041 | error: | |
1042 | rcu_read_unlock(); | |
1043 | return ret; | |
1044 | } | |
1045 | ||
1046 | /* | |
1047 | * Take a snapshot of all the stream of a channel. | |
1048 | * | |
1049 | * Returns 0 on success, < 0 on error | |
1050 | */ | |
1051 | static int snapshot_channel(uint64_t key, char *path, uint64_t relayd_id, | |
d07ceecd | 1052 | uint64_t nb_packets_per_stream, struct lttng_consumer_local_data *ctx) |
10a50311 JD |
1053 | { |
1054 | int ret; | |
1055 | unsigned use_relayd = 0; | |
1056 | unsigned long consumed_pos, produced_pos; | |
1057 | struct lttng_consumer_channel *channel; | |
1058 | struct lttng_consumer_stream *stream; | |
1059 | ||
1060 | assert(path); | |
1061 | assert(ctx); | |
1062 | ||
1063 | rcu_read_lock(); | |
1064 | ||
1065 | if (relayd_id != (uint64_t) -1ULL) { | |
1066 | use_relayd = 1; | |
1067 | } | |
1068 | ||
1069 | channel = consumer_find_channel(key); | |
1070 | if (!channel) { | |
6a00837f | 1071 | ERR("UST snapshot channel not found for key %" PRIu64, key); |
10a50311 JD |
1072 | ret = -1; |
1073 | goto error; | |
1074 | } | |
1075 | assert(!channel->monitor); | |
6a00837f | 1076 | DBG("UST consumer snapshot channel %" PRIu64, key); |
10a50311 JD |
1077 | |
1078 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
c13082a9 JD |
1079 | /* Are we at a position _before_ the first available packet ? */ |
1080 | bool before_first_packet = true; | |
9ce5646a MD |
1081 | |
1082 | health_code_update(); | |
1083 | ||
10a50311 JD |
1084 | /* Lock stream because we are about to change its state. */ |
1085 | pthread_mutex_lock(&stream->lock); | |
1086 | stream->net_seq_idx = relayd_id; | |
1087 | ||
1088 | if (use_relayd) { | |
1089 | ret = consumer_send_relayd_stream(stream, path); | |
1090 | if (ret < 0) { | |
1091 | goto error_unlock; | |
1092 | } | |
1093 | } else { | |
1094 | ret = utils_create_stream_file(path, stream->name, | |
1095 | stream->chan->tracefile_size, | |
1096 | stream->tracefile_count_current, | |
309167d2 | 1097 | stream->uid, stream->gid, NULL); |
10a50311 JD |
1098 | if (ret < 0) { |
1099 | goto error_unlock; | |
1100 | } | |
1101 | stream->out_fd = ret; | |
1102 | stream->tracefile_size_current = 0; | |
1103 | ||
1104 | DBG("UST consumer snapshot stream %s/%s (%" PRIu64 ")", path, | |
1105 | stream->name, stream->key); | |
1106 | } | |
a4baae1b JD |
1107 | if (relayd_id != -1ULL) { |
1108 | ret = consumer_send_relayd_streams_sent(relayd_id); | |
1109 | if (ret < 0) { | |
1110 | goto error_unlock; | |
1111 | } | |
1112 | } | |
10a50311 | 1113 | |
d4d80f77 MD |
1114 | /* |
1115 | * If tracing is active, we want to perform a "full" buffer flush. | |
1116 | * Else, if quiescent, it has already been done by the prior stop. | |
1117 | */ | |
1118 | if (!stream->quiescent) { | |
1119 | ustctl_flush_buffer(stream->ustream, 0); | |
1120 | } | |
10a50311 JD |
1121 | |
1122 | ret = lttng_ustconsumer_take_snapshot(stream); | |
1123 | if (ret < 0) { | |
1124 | ERR("Taking UST snapshot"); | |
1125 | goto error_unlock; | |
1126 | } | |
1127 | ||
1128 | ret = lttng_ustconsumer_get_produced_snapshot(stream, &produced_pos); | |
1129 | if (ret < 0) { | |
1130 | ERR("Produced UST snapshot position"); | |
1131 | goto error_unlock; | |
1132 | } | |
1133 | ||
1134 | ret = lttng_ustconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
1135 | if (ret < 0) { | |
1136 | ERR("Consumerd UST snapshot position"); | |
1137 | goto error_unlock; | |
1138 | } | |
1139 | ||
5c786ded JD |
1140 | /* |
1141 | * The original value is sent back if max stream size is larger than | |
d07ceecd | 1142 | * the possible size of the snapshot. Also, we assume that the session |
5c786ded JD |
1143 | * daemon should never send a maximum stream size that is lower than |
1144 | * subbuffer size. | |
1145 | */ | |
d07ceecd MD |
1146 | consumed_pos = consumer_get_consume_start_pos(consumed_pos, |
1147 | produced_pos, nb_packets_per_stream, | |
1148 | stream->max_sb_size); | |
5c786ded | 1149 | |
10a50311 JD |
1150 | while (consumed_pos < produced_pos) { |
1151 | ssize_t read_len; | |
1152 | unsigned long len, padded_len; | |
c13082a9 | 1153 | int lost_packet = 0; |
10a50311 | 1154 | |
9ce5646a MD |
1155 | health_code_update(); |
1156 | ||
10a50311 JD |
1157 | DBG("UST consumer taking snapshot at pos %lu", consumed_pos); |
1158 | ||
1159 | ret = ustctl_get_subbuf(stream->ustream, &consumed_pos); | |
1160 | if (ret < 0) { | |
1161 | if (ret != -EAGAIN) { | |
1162 | PERROR("ustctl_get_subbuf snapshot"); | |
1163 | goto error_close_stream; | |
1164 | } | |
1165 | DBG("UST consumer get subbuf failed. Skipping it."); | |
1166 | consumed_pos += stream->max_sb_size; | |
c13082a9 JD |
1167 | |
1168 | /* | |
1169 | * Start accounting lost packets only when we | |
1170 | * already have extracted packets (to match the | |
1171 | * content of the final snapshot). | |
1172 | */ | |
1173 | if (!before_first_packet) { | |
1174 | lost_packet = 1; | |
1175 | } | |
10a50311 JD |
1176 | continue; |
1177 | } | |
1178 | ||
1179 | ret = ustctl_get_subbuf_size(stream->ustream, &len); | |
1180 | if (ret < 0) { | |
1181 | ERR("Snapshot ustctl_get_subbuf_size"); | |
1182 | goto error_put_subbuf; | |
1183 | } | |
1184 | ||
1185 | ret = ustctl_get_padded_subbuf_size(stream->ustream, &padded_len); | |
1186 | if (ret < 0) { | |
1187 | ERR("Snapshot ustctl_get_padded_subbuf_size"); | |
1188 | goto error_put_subbuf; | |
1189 | } | |
1190 | ||
1191 | read_len = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, len, | |
309167d2 | 1192 | padded_len - len, NULL); |
10a50311 JD |
1193 | if (use_relayd) { |
1194 | if (read_len != len) { | |
56591bac | 1195 | ret = -EPERM; |
10a50311 JD |
1196 | goto error_put_subbuf; |
1197 | } | |
1198 | } else { | |
1199 | if (read_len != padded_len) { | |
56591bac | 1200 | ret = -EPERM; |
10a50311 JD |
1201 | goto error_put_subbuf; |
1202 | } | |
1203 | } | |
1204 | ||
1205 | ret = ustctl_put_subbuf(stream->ustream); | |
1206 | if (ret < 0) { | |
1207 | ERR("Snapshot ustctl_put_subbuf"); | |
1208 | goto error_close_stream; | |
1209 | } | |
1210 | consumed_pos += stream->max_sb_size; | |
c13082a9 JD |
1211 | |
1212 | /* | |
1213 | * Only account lost packets located between | |
1214 | * succesfully extracted packets (do not account before | |
1215 | * and after since they are not visible in the | |
1216 | * resulting snapshot). | |
1217 | */ | |
1218 | stream->chan->lost_packets += lost_packet; | |
1219 | lost_packet = 0; | |
1220 | before_first_packet = false; | |
10a50311 JD |
1221 | } |
1222 | ||
1223 | /* Simply close the stream so we can use it on the next snapshot. */ | |
1224 | consumer_stream_close(stream); | |
1225 | pthread_mutex_unlock(&stream->lock); | |
1226 | } | |
1227 | ||
1228 | rcu_read_unlock(); | |
1229 | return 0; | |
1230 | ||
1231 | error_put_subbuf: | |
1232 | if (ustctl_put_subbuf(stream->ustream) < 0) { | |
1233 | ERR("Snapshot ustctl_put_subbuf"); | |
1234 | } | |
1235 | error_close_stream: | |
1236 | consumer_stream_close(stream); | |
1237 | error_unlock: | |
1238 | pthread_mutex_unlock(&stream->lock); | |
1239 | error: | |
1240 | rcu_read_unlock(); | |
d88aee68 DG |
1241 | return ret; |
1242 | } | |
1243 | ||
331744e3 | 1244 | /* |
c585821b MD |
1245 | * Receive the metadata updates from the sessiond. Supports receiving |
1246 | * overlapping metadata, but is needs to always belong to a contiguous | |
1247 | * range starting from 0. | |
1248 | * Be careful about the locks held when calling this function: it needs | |
1249 | * the metadata cache flush to concurrently progress in order to | |
1250 | * complete. | |
331744e3 JD |
1251 | */ |
1252 | int lttng_ustconsumer_recv_metadata(int sock, uint64_t key, uint64_t offset, | |
93ec662e JD |
1253 | uint64_t len, uint64_t version, |
1254 | struct lttng_consumer_channel *channel, int timer, int wait) | |
331744e3 | 1255 | { |
0c759fc9 | 1256 | int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
331744e3 JD |
1257 | char *metadata_str; |
1258 | ||
8fd623e0 | 1259 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, len); |
331744e3 JD |
1260 | |
1261 | metadata_str = zmalloc(len * sizeof(char)); | |
1262 | if (!metadata_str) { | |
1263 | PERROR("zmalloc metadata string"); | |
1264 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; | |
1265 | goto end; | |
1266 | } | |
1267 | ||
9ce5646a MD |
1268 | health_code_update(); |
1269 | ||
331744e3 JD |
1270 | /* Receive metadata string. */ |
1271 | ret = lttcomm_recv_unix_sock(sock, metadata_str, len); | |
1272 | if (ret < 0) { | |
1273 | /* Session daemon is dead so return gracefully. */ | |
1274 | ret_code = ret; | |
1275 | goto end_free; | |
1276 | } | |
1277 | ||
9ce5646a MD |
1278 | health_code_update(); |
1279 | ||
331744e3 | 1280 | pthread_mutex_lock(&channel->metadata_cache->lock); |
93ec662e JD |
1281 | ret = consumer_metadata_cache_write(channel, offset, len, version, |
1282 | metadata_str); | |
331744e3 JD |
1283 | if (ret < 0) { |
1284 | /* Unable to handle metadata. Notify session daemon. */ | |
1285 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
a32bd775 DG |
1286 | /* |
1287 | * Skip metadata flush on write error since the offset and len might | |
1288 | * not have been updated which could create an infinite loop below when | |
1289 | * waiting for the metadata cache to be flushed. | |
1290 | */ | |
1291 | pthread_mutex_unlock(&channel->metadata_cache->lock); | |
a32bd775 | 1292 | goto end_free; |
331744e3 JD |
1293 | } |
1294 | pthread_mutex_unlock(&channel->metadata_cache->lock); | |
1295 | ||
94d49140 JD |
1296 | if (!wait) { |
1297 | goto end_free; | |
1298 | } | |
5e41ebe1 | 1299 | while (consumer_metadata_cache_flushed(channel, offset + len, timer)) { |
331744e3 | 1300 | DBG("Waiting for metadata to be flushed"); |
9ce5646a MD |
1301 | |
1302 | health_code_update(); | |
1303 | ||
331744e3 JD |
1304 | usleep(DEFAULT_METADATA_AVAILABILITY_WAIT_TIME); |
1305 | } | |
1306 | ||
1307 | end_free: | |
1308 | free(metadata_str); | |
1309 | end: | |
1310 | return ret_code; | |
1311 | } | |
1312 | ||
4cbc1a04 DG |
1313 | /* |
1314 | * Receive command from session daemon and process it. | |
1315 | * | |
1316 | * Return 1 on success else a negative value or 0. | |
1317 | */ | |
3bd1e081 MD |
1318 | int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
1319 | int sock, struct pollfd *consumer_sockpoll) | |
1320 | { | |
1321 | ssize_t ret; | |
0c759fc9 | 1322 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
3bd1e081 | 1323 | struct lttcomm_consumer_msg msg; |
ffe60014 | 1324 | struct lttng_consumer_channel *channel = NULL; |
3bd1e081 | 1325 | |
9ce5646a MD |
1326 | health_code_update(); |
1327 | ||
3bd1e081 MD |
1328 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); |
1329 | if (ret != sizeof(msg)) { | |
173af62f DG |
1330 | DBG("Consumer received unexpected message size %zd (expects %zu)", |
1331 | ret, sizeof(msg)); | |
3be74084 DG |
1332 | /* |
1333 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
1334 | * since the caller handles this. | |
1335 | */ | |
489f70e9 | 1336 | if (ret > 0) { |
c6857fcf | 1337 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
489f70e9 MD |
1338 | ret = -1; |
1339 | } | |
3bd1e081 MD |
1340 | return ret; |
1341 | } | |
9ce5646a MD |
1342 | |
1343 | health_code_update(); | |
1344 | ||
84382d49 MD |
1345 | /* deprecated */ |
1346 | assert(msg.cmd_type != LTTNG_CONSUMER_STOP); | |
3bd1e081 | 1347 | |
9ce5646a MD |
1348 | health_code_update(); |
1349 | ||
3f8e211f | 1350 | /* relayd needs RCU read-side lock */ |
b0b335c8 MD |
1351 | rcu_read_lock(); |
1352 | ||
3bd1e081 | 1353 | switch (msg.cmd_type) { |
00e2e675 DG |
1354 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
1355 | { | |
f50f23d9 | 1356 | /* Session daemon status message are handled in the following call. */ |
7735ef9e DG |
1357 | ret = consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
1358 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, | |
d3e2ba59 JD |
1359 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id, |
1360 | msg.u.relayd_sock.relayd_session_id); | |
00e2e675 DG |
1361 | goto end_nosignal; |
1362 | } | |
173af62f DG |
1363 | case LTTNG_CONSUMER_DESTROY_RELAYD: |
1364 | { | |
a6ba4fe1 | 1365 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
173af62f DG |
1366 | struct consumer_relayd_sock_pair *relayd; |
1367 | ||
a6ba4fe1 | 1368 | DBG("UST consumer destroying relayd %" PRIu64, index); |
173af62f DG |
1369 | |
1370 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 1371 | relayd = consumer_find_relayd(index); |
173af62f | 1372 | if (relayd == NULL) { |
3448e266 | 1373 | DBG("Unable to find relayd %" PRIu64, index); |
e462382a | 1374 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
173af62f DG |
1375 | } |
1376 | ||
a6ba4fe1 DG |
1377 | /* |
1378 | * Each relayd socket pair has a refcount of stream attached to it | |
1379 | * which tells if the relayd is still active or not depending on the | |
1380 | * refcount value. | |
1381 | * | |
1382 | * This will set the destroy flag of the relayd object and destroy it | |
1383 | * if the refcount reaches zero when called. | |
1384 | * | |
1385 | * The destroy can happen either here or when a stream fd hangs up. | |
1386 | */ | |
f50f23d9 DG |
1387 | if (relayd) { |
1388 | consumer_flag_relayd_for_destroy(relayd); | |
1389 | } | |
1390 | ||
d88aee68 | 1391 | goto end_msg_sessiond; |
173af62f | 1392 | } |
3bd1e081 MD |
1393 | case LTTNG_CONSUMER_UPDATE_STREAM: |
1394 | { | |
3f8e211f | 1395 | rcu_read_unlock(); |
7ad0a0cb | 1396 | return -ENOSYS; |
3bd1e081 | 1397 | } |
6d805429 | 1398 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 1399 | { |
3be74084 | 1400 | int ret, is_data_pending; |
6d805429 | 1401 | uint64_t id = msg.u.data_pending.session_id; |
ca22feea | 1402 | |
6d805429 | 1403 | DBG("UST consumer data pending command for id %" PRIu64, id); |
ca22feea | 1404 | |
3be74084 | 1405 | is_data_pending = consumer_data_pending(id); |
ca22feea DG |
1406 | |
1407 | /* Send back returned value to session daemon */ | |
3be74084 DG |
1408 | ret = lttcomm_send_unix_sock(sock, &is_data_pending, |
1409 | sizeof(is_data_pending)); | |
ca22feea | 1410 | if (ret < 0) { |
3be74084 | 1411 | DBG("Error when sending the data pending ret code: %d", ret); |
489f70e9 | 1412 | goto error_fatal; |
ca22feea | 1413 | } |
f50f23d9 DG |
1414 | |
1415 | /* | |
1416 | * No need to send back a status message since the data pending | |
1417 | * returned value is the response. | |
1418 | */ | |
ca22feea | 1419 | break; |
53632229 | 1420 | } |
ffe60014 DG |
1421 | case LTTNG_CONSUMER_ASK_CHANNEL_CREATION: |
1422 | { | |
1423 | int ret; | |
1424 | struct ustctl_consumer_channel_attr attr; | |
1425 | ||
1426 | /* Create a plain object and reserve a channel key. */ | |
1427 | channel = allocate_channel(msg.u.ask_channel.session_id, | |
1428 | msg.u.ask_channel.pathname, msg.u.ask_channel.name, | |
1429 | msg.u.ask_channel.uid, msg.u.ask_channel.gid, | |
1430 | msg.u.ask_channel.relayd_id, msg.u.ask_channel.key, | |
1624d5b7 JD |
1431 | (enum lttng_event_output) msg.u.ask_channel.output, |
1432 | msg.u.ask_channel.tracefile_size, | |
2bba9e53 | 1433 | msg.u.ask_channel.tracefile_count, |
1950109e | 1434 | msg.u.ask_channel.session_id_per_pid, |
ecc48a90 | 1435 | msg.u.ask_channel.monitor, |
d7ba1388 | 1436 | msg.u.ask_channel.live_timer_interval, |
3d071855 | 1437 | msg.u.ask_channel.root_shm_path, |
d7ba1388 | 1438 | msg.u.ask_channel.shm_path); |
ffe60014 DG |
1439 | if (!channel) { |
1440 | goto end_channel_error; | |
1441 | } | |
1442 | ||
567eb353 DG |
1443 | /* |
1444 | * Assign UST application UID to the channel. This value is ignored for | |
1445 | * per PID buffers. This is specific to UST thus setting this after the | |
1446 | * allocation. | |
1447 | */ | |
1448 | channel->ust_app_uid = msg.u.ask_channel.ust_app_uid; | |
1449 | ||
ffe60014 DG |
1450 | /* Build channel attributes from received message. */ |
1451 | attr.subbuf_size = msg.u.ask_channel.subbuf_size; | |
1452 | attr.num_subbuf = msg.u.ask_channel.num_subbuf; | |
1453 | attr.overwrite = msg.u.ask_channel.overwrite; | |
1454 | attr.switch_timer_interval = msg.u.ask_channel.switch_timer_interval; | |
1455 | attr.read_timer_interval = msg.u.ask_channel.read_timer_interval; | |
7972aab2 | 1456 | attr.chan_id = msg.u.ask_channel.chan_id; |
ffe60014 DG |
1457 | memcpy(attr.uuid, msg.u.ask_channel.uuid, sizeof(attr.uuid)); |
1458 | ||
0c759fc9 DG |
1459 | /* Match channel buffer type to the UST abi. */ |
1460 | switch (msg.u.ask_channel.output) { | |
1461 | case LTTNG_EVENT_MMAP: | |
1462 | default: | |
1463 | attr.output = LTTNG_UST_MMAP; | |
1464 | break; | |
1465 | } | |
1466 | ||
ffe60014 DG |
1467 | /* Translate and save channel type. */ |
1468 | switch (msg.u.ask_channel.type) { | |
1469 | case LTTNG_UST_CHAN_PER_CPU: | |
1470 | channel->type = CONSUMER_CHANNEL_TYPE_DATA; | |
1471 | attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8633d6e3 MD |
1472 | /* |
1473 | * Set refcount to 1 for owner. Below, we will | |
1474 | * pass ownership to the | |
1475 | * consumer_thread_channel_poll() thread. | |
1476 | */ | |
1477 | channel->refcount = 1; | |
ffe60014 DG |
1478 | break; |
1479 | case LTTNG_UST_CHAN_METADATA: | |
1480 | channel->type = CONSUMER_CHANNEL_TYPE_METADATA; | |
1481 | attr.type = LTTNG_UST_CHAN_METADATA; | |
1482 | break; | |
1483 | default: | |
1484 | assert(0); | |
1485 | goto error_fatal; | |
1486 | }; | |
1487 | ||
9ce5646a MD |
1488 | health_code_update(); |
1489 | ||
ffe60014 DG |
1490 | ret = ask_channel(ctx, sock, channel, &attr); |
1491 | if (ret < 0) { | |
1492 | goto end_channel_error; | |
1493 | } | |
1494 | ||
fc643247 MD |
1495 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
1496 | ret = consumer_metadata_cache_allocate(channel); | |
1497 | if (ret < 0) { | |
1498 | ERR("Allocating metadata cache"); | |
1499 | goto end_channel_error; | |
1500 | } | |
1501 | consumer_timer_switch_start(channel, attr.switch_timer_interval); | |
1502 | attr.switch_timer_interval = 0; | |
94d49140 JD |
1503 | } else { |
1504 | consumer_timer_live_start(channel, | |
1505 | msg.u.ask_channel.live_timer_interval); | |
fc643247 MD |
1506 | } |
1507 | ||
9ce5646a MD |
1508 | health_code_update(); |
1509 | ||
ffe60014 DG |
1510 | /* |
1511 | * Add the channel to the internal state AFTER all streams were created | |
1512 | * and successfully sent to session daemon. This way, all streams must | |
1513 | * be ready before this channel is visible to the threads. | |
fc643247 MD |
1514 | * If add_channel succeeds, ownership of the channel is |
1515 | * passed to consumer_thread_channel_poll(). | |
ffe60014 DG |
1516 | */ |
1517 | ret = add_channel(channel, ctx); | |
1518 | if (ret < 0) { | |
ea88ca2a MD |
1519 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
1520 | if (channel->switch_timer_enabled == 1) { | |
1521 | consumer_timer_switch_stop(channel); | |
1522 | } | |
1523 | consumer_metadata_cache_destroy(channel); | |
1524 | } | |
d3e2ba59 JD |
1525 | if (channel->live_timer_enabled == 1) { |
1526 | consumer_timer_live_stop(channel); | |
1527 | } | |
ffe60014 DG |
1528 | goto end_channel_error; |
1529 | } | |
1530 | ||
9ce5646a MD |
1531 | health_code_update(); |
1532 | ||
ffe60014 DG |
1533 | /* |
1534 | * Channel and streams are now created. Inform the session daemon that | |
1535 | * everything went well and should wait to receive the channel and | |
1536 | * streams with ustctl API. | |
1537 | */ | |
1538 | ret = consumer_send_status_channel(sock, channel); | |
1539 | if (ret < 0) { | |
1540 | /* | |
489f70e9 | 1541 | * There is probably a problem on the socket. |
ffe60014 | 1542 | */ |
489f70e9 | 1543 | goto error_fatal; |
ffe60014 DG |
1544 | } |
1545 | ||
1546 | break; | |
1547 | } | |
1548 | case LTTNG_CONSUMER_GET_CHANNEL: | |
1549 | { | |
1550 | int ret, relayd_err = 0; | |
d88aee68 | 1551 | uint64_t key = msg.u.get_channel.key; |
ffe60014 | 1552 | struct lttng_consumer_channel *channel; |
ffe60014 DG |
1553 | |
1554 | channel = consumer_find_channel(key); | |
1555 | if (!channel) { | |
8fd623e0 | 1556 | ERR("UST consumer get channel key %" PRIu64 " not found", key); |
e462382a | 1557 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
ffe60014 DG |
1558 | goto end_msg_sessiond; |
1559 | } | |
1560 | ||
9ce5646a MD |
1561 | health_code_update(); |
1562 | ||
ffe60014 DG |
1563 | /* Send everything to sessiond. */ |
1564 | ret = send_sessiond_channel(sock, channel, ctx, &relayd_err); | |
1565 | if (ret < 0) { | |
1566 | if (relayd_err) { | |
1567 | /* | |
1568 | * We were unable to send to the relayd the stream so avoid | |
1569 | * sending back a fatal error to the thread since this is OK | |
f2a444f1 DG |
1570 | * and the consumer can continue its work. The above call |
1571 | * has sent the error status message to the sessiond. | |
ffe60014 | 1572 | */ |
f2a444f1 | 1573 | goto end_nosignal; |
ffe60014 DG |
1574 | } |
1575 | /* | |
1576 | * The communicaton was broken hence there is a bad state between | |
1577 | * the consumer and sessiond so stop everything. | |
1578 | */ | |
1579 | goto error_fatal; | |
1580 | } | |
1581 | ||
9ce5646a MD |
1582 | health_code_update(); |
1583 | ||
10a50311 JD |
1584 | /* |
1585 | * In no monitor mode, the streams ownership is kept inside the channel | |
1586 | * so don't send them to the data thread. | |
1587 | */ | |
1588 | if (!channel->monitor) { | |
1589 | goto end_msg_sessiond; | |
1590 | } | |
1591 | ||
d88aee68 DG |
1592 | ret = send_streams_to_thread(channel, ctx); |
1593 | if (ret < 0) { | |
1594 | /* | |
1595 | * If we are unable to send the stream to the thread, there is | |
1596 | * a big problem so just stop everything. | |
1597 | */ | |
1598 | goto error_fatal; | |
ffe60014 | 1599 | } |
ffe60014 DG |
1600 | /* List MUST be empty after or else it could be reused. */ |
1601 | assert(cds_list_empty(&channel->streams.head)); | |
d88aee68 DG |
1602 | goto end_msg_sessiond; |
1603 | } | |
1604 | case LTTNG_CONSUMER_DESTROY_CHANNEL: | |
1605 | { | |
1606 | uint64_t key = msg.u.destroy_channel.key; | |
d88aee68 | 1607 | |
a0cbdd2e MD |
1608 | /* |
1609 | * Only called if streams have not been sent to stream | |
1610 | * manager thread. However, channel has been sent to | |
1611 | * channel manager thread. | |
1612 | */ | |
1613 | notify_thread_del_channel(ctx, key); | |
d88aee68 | 1614 | goto end_msg_sessiond; |
ffe60014 | 1615 | } |
d88aee68 DG |
1616 | case LTTNG_CONSUMER_CLOSE_METADATA: |
1617 | { | |
1618 | int ret; | |
1619 | ||
1620 | ret = close_metadata(msg.u.close_metadata.key); | |
1621 | if (ret != 0) { | |
1622 | ret_code = ret; | |
1623 | } | |
1624 | ||
1625 | goto end_msg_sessiond; | |
1626 | } | |
7972aab2 DG |
1627 | case LTTNG_CONSUMER_FLUSH_CHANNEL: |
1628 | { | |
1629 | int ret; | |
1630 | ||
1631 | ret = flush_channel(msg.u.flush_channel.key); | |
1632 | if (ret != 0) { | |
1633 | ret_code = ret; | |
1634 | } | |
1635 | ||
1636 | goto end_msg_sessiond; | |
1637 | } | |
0dd01979 MD |
1638 | case LTTNG_CONSUMER_CLEAR_QUIESCENT_CHANNEL: |
1639 | { | |
1640 | int ret; | |
1641 | ||
1642 | ret = clear_quiescent_channel( | |
1643 | msg.u.clear_quiescent_channel.key); | |
1644 | if (ret != 0) { | |
1645 | ret_code = ret; | |
1646 | } | |
1647 | ||
1648 | goto end_msg_sessiond; | |
1649 | } | |
d88aee68 | 1650 | case LTTNG_CONSUMER_PUSH_METADATA: |
ffe60014 DG |
1651 | { |
1652 | int ret; | |
d88aee68 | 1653 | uint64_t len = msg.u.push_metadata.len; |
d88aee68 | 1654 | uint64_t key = msg.u.push_metadata.key; |
331744e3 | 1655 | uint64_t offset = msg.u.push_metadata.target_offset; |
93ec662e | 1656 | uint64_t version = msg.u.push_metadata.version; |
ffe60014 DG |
1657 | struct lttng_consumer_channel *channel; |
1658 | ||
8fd623e0 DG |
1659 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, |
1660 | len); | |
ffe60014 DG |
1661 | |
1662 | channel = consumer_find_channel(key); | |
1663 | if (!channel) { | |
000baf6a DG |
1664 | /* |
1665 | * This is possible if the metadata creation on the consumer side | |
1666 | * is in flight vis-a-vis a concurrent push metadata from the | |
1667 | * session daemon. Simply return that the channel failed and the | |
1668 | * session daemon will handle that message correctly considering | |
1669 | * that this race is acceptable thus the DBG() statement here. | |
1670 | */ | |
1671 | DBG("UST consumer push metadata %" PRIu64 " not found", key); | |
1672 | ret_code = LTTCOMM_CONSUMERD_CHANNEL_FAIL; | |
4a2eb0ca | 1673 | goto end_msg_sessiond; |
d88aee68 DG |
1674 | } |
1675 | ||
9ce5646a MD |
1676 | health_code_update(); |
1677 | ||
c585821b MD |
1678 | if (!len) { |
1679 | /* | |
1680 | * There is nothing to receive. We have simply | |
1681 | * checked whether the channel can be found. | |
1682 | */ | |
1683 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1684 | goto end_msg_sessiond; | |
1685 | } | |
1686 | ||
d88aee68 | 1687 | /* Tell session daemon we are ready to receive the metadata. */ |
0c759fc9 | 1688 | ret = consumer_send_status_msg(sock, LTTCOMM_CONSUMERD_SUCCESS); |
ffe60014 DG |
1689 | if (ret < 0) { |
1690 | /* Somehow, the session daemon is not responding anymore. */ | |
d88aee68 DG |
1691 | goto error_fatal; |
1692 | } | |
1693 | ||
9ce5646a MD |
1694 | health_code_update(); |
1695 | ||
d88aee68 | 1696 | /* Wait for more data. */ |
9ce5646a MD |
1697 | health_poll_entry(); |
1698 | ret = lttng_consumer_poll_socket(consumer_sockpoll); | |
1699 | health_poll_exit(); | |
84382d49 | 1700 | if (ret) { |
489f70e9 | 1701 | goto error_fatal; |
d88aee68 DG |
1702 | } |
1703 | ||
9ce5646a MD |
1704 | health_code_update(); |
1705 | ||
331744e3 | 1706 | ret = lttng_ustconsumer_recv_metadata(sock, key, offset, |
93ec662e | 1707 | len, version, channel, 0, 1); |
d88aee68 | 1708 | if (ret < 0) { |
331744e3 | 1709 | /* error receiving from sessiond */ |
489f70e9 | 1710 | goto error_fatal; |
331744e3 JD |
1711 | } else { |
1712 | ret_code = ret; | |
d88aee68 DG |
1713 | goto end_msg_sessiond; |
1714 | } | |
d88aee68 DG |
1715 | } |
1716 | case LTTNG_CONSUMER_SETUP_METADATA: | |
1717 | { | |
1718 | int ret; | |
1719 | ||
1720 | ret = setup_metadata(ctx, msg.u.setup_metadata.key); | |
1721 | if (ret) { | |
1722 | ret_code = ret; | |
1723 | } | |
1724 | goto end_msg_sessiond; | |
ffe60014 | 1725 | } |
6dc3064a DG |
1726 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
1727 | { | |
10a50311 JD |
1728 | if (msg.u.snapshot_channel.metadata) { |
1729 | ret = snapshot_metadata(msg.u.snapshot_channel.key, | |
1730 | msg.u.snapshot_channel.pathname, | |
1731 | msg.u.snapshot_channel.relayd_id, | |
1732 | ctx); | |
1733 | if (ret < 0) { | |
1734 | ERR("Snapshot metadata failed"); | |
e462382a | 1735 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; |
10a50311 JD |
1736 | } |
1737 | } else { | |
1738 | ret = snapshot_channel(msg.u.snapshot_channel.key, | |
1739 | msg.u.snapshot_channel.pathname, | |
1740 | msg.u.snapshot_channel.relayd_id, | |
d07ceecd | 1741 | msg.u.snapshot_channel.nb_packets_per_stream, |
10a50311 JD |
1742 | ctx); |
1743 | if (ret < 0) { | |
1744 | ERR("Snapshot channel failed"); | |
e462382a | 1745 | ret_code = LTTCOMM_CONSUMERD_CHANNEL_FAIL; |
10a50311 JD |
1746 | } |
1747 | } | |
1748 | ||
9ce5646a | 1749 | health_code_update(); |
6dc3064a DG |
1750 | ret = consumer_send_status_msg(sock, ret_code); |
1751 | if (ret < 0) { | |
1752 | /* Somehow, the session daemon is not responding anymore. */ | |
1753 | goto end_nosignal; | |
1754 | } | |
9ce5646a | 1755 | health_code_update(); |
6dc3064a DG |
1756 | break; |
1757 | } | |
fb83fe64 JD |
1758 | case LTTNG_CONSUMER_DISCARDED_EVENTS: |
1759 | { | |
beb59458 MJ |
1760 | int ret = 0; |
1761 | uint64_t discarded_events; | |
fb83fe64 JD |
1762 | struct lttng_ht_iter iter; |
1763 | struct lttng_ht *ht; | |
1764 | struct lttng_consumer_stream *stream; | |
1765 | uint64_t id = msg.u.discarded_events.session_id; | |
1766 | uint64_t key = msg.u.discarded_events.channel_key; | |
1767 | ||
1768 | DBG("UST consumer discarded events command for session id %" | |
1769 | PRIu64, id); | |
1770 | rcu_read_lock(); | |
1771 | pthread_mutex_lock(&consumer_data.lock); | |
1772 | ||
1773 | ht = consumer_data.stream_list_ht; | |
1774 | ||
1775 | /* | |
1776 | * We only need a reference to the channel, but they are not | |
1777 | * directly indexed, so we just use the first matching stream | |
1778 | * to extract the information we need, we default to 0 if not | |
1779 | * found (no events are dropped if the channel is not yet in | |
1780 | * use). | |
1781 | */ | |
beb59458 | 1782 | discarded_events = 0; |
fb83fe64 JD |
1783 | cds_lfht_for_each_entry_duplicate(ht->ht, |
1784 | ht->hash_fct(&id, lttng_ht_seed), | |
1785 | ht->match_fct, &id, | |
1786 | &iter.iter, stream, node_session_id.node) { | |
1787 | if (stream->chan->key == key) { | |
beb59458 | 1788 | discarded_events = stream->chan->discarded_events; |
fb83fe64 JD |
1789 | break; |
1790 | } | |
1791 | } | |
1792 | pthread_mutex_unlock(&consumer_data.lock); | |
1793 | rcu_read_unlock(); | |
1794 | ||
1795 | DBG("UST consumer discarded events command for session id %" | |
1796 | PRIu64 ", channel key %" PRIu64, id, key); | |
1797 | ||
1798 | health_code_update(); | |
1799 | ||
1800 | /* Send back returned value to session daemon */ | |
beb59458 | 1801 | ret = lttcomm_send_unix_sock(sock, &discarded_events, sizeof(discarded_events)); |
fb83fe64 JD |
1802 | if (ret < 0) { |
1803 | PERROR("send discarded events"); | |
1804 | goto error_fatal; | |
1805 | } | |
1806 | ||
1807 | break; | |
1808 | } | |
1809 | case LTTNG_CONSUMER_LOST_PACKETS: | |
1810 | { | |
9a06e8d4 JG |
1811 | int ret; |
1812 | uint64_t lost_packets; | |
fb83fe64 JD |
1813 | struct lttng_ht_iter iter; |
1814 | struct lttng_ht *ht; | |
1815 | struct lttng_consumer_stream *stream; | |
1816 | uint64_t id = msg.u.lost_packets.session_id; | |
1817 | uint64_t key = msg.u.lost_packets.channel_key; | |
1818 | ||
1819 | DBG("UST consumer lost packets command for session id %" | |
1820 | PRIu64, id); | |
1821 | rcu_read_lock(); | |
1822 | pthread_mutex_lock(&consumer_data.lock); | |
1823 | ||
1824 | ht = consumer_data.stream_list_ht; | |
1825 | ||
1826 | /* | |
1827 | * We only need a reference to the channel, but they are not | |
1828 | * directly indexed, so we just use the first matching stream | |
1829 | * to extract the information we need, we default to 0 if not | |
1830 | * found (no packets lost if the channel is not yet in use). | |
1831 | */ | |
9a06e8d4 | 1832 | lost_packets = 0; |
fb83fe64 JD |
1833 | cds_lfht_for_each_entry_duplicate(ht->ht, |
1834 | ht->hash_fct(&id, lttng_ht_seed), | |
1835 | ht->match_fct, &id, | |
1836 | &iter.iter, stream, node_session_id.node) { | |
1837 | if (stream->chan->key == key) { | |
9a06e8d4 | 1838 | lost_packets = stream->chan->lost_packets; |
fb83fe64 JD |
1839 | break; |
1840 | } | |
1841 | } | |
1842 | pthread_mutex_unlock(&consumer_data.lock); | |
1843 | rcu_read_unlock(); | |
1844 | ||
1845 | DBG("UST consumer lost packets command for session id %" | |
1846 | PRIu64 ", channel key %" PRIu64, id, key); | |
1847 | ||
1848 | health_code_update(); | |
1849 | ||
1850 | /* Send back returned value to session daemon */ | |
9a06e8d4 JG |
1851 | ret = lttcomm_send_unix_sock(sock, &lost_packets, |
1852 | sizeof(lost_packets)); | |
fb83fe64 JD |
1853 | if (ret < 0) { |
1854 | PERROR("send lost packets"); | |
1855 | goto error_fatal; | |
1856 | } | |
1857 | ||
1858 | break; | |
1859 | } | |
3bd1e081 MD |
1860 | default: |
1861 | break; | |
1862 | } | |
3f8e211f | 1863 | |
3bd1e081 | 1864 | end_nosignal: |
b0b335c8 | 1865 | rcu_read_unlock(); |
4cbc1a04 | 1866 | |
9ce5646a MD |
1867 | health_code_update(); |
1868 | ||
4cbc1a04 DG |
1869 | /* |
1870 | * Return 1 to indicate success since the 0 value can be a socket | |
1871 | * shutdown during the recv() or send() call. | |
1872 | */ | |
1873 | return 1; | |
ffe60014 DG |
1874 | |
1875 | end_msg_sessiond: | |
1876 | /* | |
1877 | * The returned value here is not useful since either way we'll return 1 to | |
1878 | * the caller because the session daemon socket management is done | |
1879 | * elsewhere. Returning a negative code or 0 will shutdown the consumer. | |
1880 | */ | |
489f70e9 MD |
1881 | ret = consumer_send_status_msg(sock, ret_code); |
1882 | if (ret < 0) { | |
1883 | goto error_fatal; | |
1884 | } | |
ffe60014 | 1885 | rcu_read_unlock(); |
9ce5646a MD |
1886 | |
1887 | health_code_update(); | |
1888 | ||
ffe60014 DG |
1889 | return 1; |
1890 | end_channel_error: | |
1891 | if (channel) { | |
1892 | /* | |
1893 | * Free channel here since no one has a reference to it. We don't | |
1894 | * free after that because a stream can store this pointer. | |
1895 | */ | |
1896 | destroy_channel(channel); | |
1897 | } | |
1898 | /* We have to send a status channel message indicating an error. */ | |
1899 | ret = consumer_send_status_channel(sock, NULL); | |
1900 | if (ret < 0) { | |
1901 | /* Stop everything if session daemon can not be notified. */ | |
1902 | goto error_fatal; | |
1903 | } | |
1904 | rcu_read_unlock(); | |
9ce5646a MD |
1905 | |
1906 | health_code_update(); | |
1907 | ||
ffe60014 DG |
1908 | return 1; |
1909 | error_fatal: | |
1910 | rcu_read_unlock(); | |
1911 | /* This will issue a consumer stop. */ | |
1912 | return -1; | |
3bd1e081 MD |
1913 | } |
1914 | ||
ffe60014 DG |
1915 | /* |
1916 | * Wrapper over the mmap() read offset from ust-ctl library. Since this can be | |
1917 | * compiled out, we isolate it in this library. | |
1918 | */ | |
1919 | int lttng_ustctl_get_mmap_read_offset(struct lttng_consumer_stream *stream, | |
1920 | unsigned long *off) | |
3bd1e081 | 1921 | { |
ffe60014 DG |
1922 | assert(stream); |
1923 | assert(stream->ustream); | |
b5c5fc29 | 1924 | |
ffe60014 | 1925 | return ustctl_get_mmap_read_offset(stream->ustream, off); |
3bd1e081 MD |
1926 | } |
1927 | ||
ffe60014 DG |
1928 | /* |
1929 | * Wrapper over the mmap() read offset from ust-ctl library. Since this can be | |
1930 | * compiled out, we isolate it in this library. | |
1931 | */ | |
1932 | void *lttng_ustctl_get_mmap_base(struct lttng_consumer_stream *stream) | |
d056b477 | 1933 | { |
ffe60014 DG |
1934 | assert(stream); |
1935 | assert(stream->ustream); | |
1936 | ||
1937 | return ustctl_get_mmap_base(stream->ustream); | |
d056b477 MD |
1938 | } |
1939 | ||
ffe60014 DG |
1940 | /* |
1941 | * Take a snapshot for a specific fd | |
1942 | * | |
1943 | * Returns 0 on success, < 0 on error | |
1944 | */ | |
1945 | int lttng_ustconsumer_take_snapshot(struct lttng_consumer_stream *stream) | |
3bd1e081 | 1946 | { |
ffe60014 DG |
1947 | assert(stream); |
1948 | assert(stream->ustream); | |
1949 | ||
1950 | return ustctl_snapshot(stream->ustream); | |
3bd1e081 MD |
1951 | } |
1952 | ||
ffe60014 DG |
1953 | /* |
1954 | * Get the produced position | |
1955 | * | |
1956 | * Returns 0 on success, < 0 on error | |
1957 | */ | |
1958 | int lttng_ustconsumer_get_produced_snapshot( | |
1959 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
3bd1e081 | 1960 | { |
ffe60014 DG |
1961 | assert(stream); |
1962 | assert(stream->ustream); | |
1963 | assert(pos); | |
7a57cf92 | 1964 | |
ffe60014 DG |
1965 | return ustctl_snapshot_get_produced(stream->ustream, pos); |
1966 | } | |
7a57cf92 | 1967 | |
10a50311 JD |
1968 | /* |
1969 | * Get the consumed position | |
1970 | * | |
1971 | * Returns 0 on success, < 0 on error | |
1972 | */ | |
1973 | int lttng_ustconsumer_get_consumed_snapshot( | |
1974 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
1975 | { | |
1976 | assert(stream); | |
1977 | assert(stream->ustream); | |
1978 | assert(pos); | |
1979 | ||
1980 | return ustctl_snapshot_get_consumed(stream->ustream, pos); | |
1981 | } | |
1982 | ||
84a182ce DG |
1983 | void lttng_ustconsumer_flush_buffer(struct lttng_consumer_stream *stream, |
1984 | int producer) | |
1985 | { | |
1986 | assert(stream); | |
1987 | assert(stream->ustream); | |
1988 | ||
1989 | ustctl_flush_buffer(stream->ustream, producer); | |
1990 | } | |
1991 | ||
1992 | int lttng_ustconsumer_get_current_timestamp( | |
1993 | struct lttng_consumer_stream *stream, uint64_t *ts) | |
1994 | { | |
1995 | assert(stream); | |
1996 | assert(stream->ustream); | |
1997 | assert(ts); | |
1998 | ||
1999 | return ustctl_get_current_timestamp(stream->ustream, ts); | |
2000 | } | |
2001 | ||
fb83fe64 JD |
2002 | int lttng_ustconsumer_get_sequence_number( |
2003 | struct lttng_consumer_stream *stream, uint64_t *seq) | |
2004 | { | |
2005 | assert(stream); | |
2006 | assert(stream->ustream); | |
2007 | assert(seq); | |
2008 | ||
2009 | return ustctl_get_sequence_number(stream->ustream, seq); | |
2010 | } | |
2011 | ||
ffe60014 | 2012 | /* |
0dd01979 | 2013 | * Called when the stream signals the consumer that it has hung up. |
ffe60014 DG |
2014 | */ |
2015 | void lttng_ustconsumer_on_stream_hangup(struct lttng_consumer_stream *stream) | |
2016 | { | |
2017 | assert(stream); | |
2018 | assert(stream->ustream); | |
2c1dd183 | 2019 | |
0dd01979 MD |
2020 | pthread_mutex_lock(&stream->lock); |
2021 | if (!stream->quiescent) { | |
2022 | ustctl_flush_buffer(stream->ustream, 0); | |
2023 | stream->quiescent = true; | |
2024 | } | |
2025 | pthread_mutex_unlock(&stream->lock); | |
ffe60014 DG |
2026 | stream->hangup_flush_done = 1; |
2027 | } | |
ee77a7b0 | 2028 | |
ffe60014 DG |
2029 | void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan) |
2030 | { | |
4628484a MD |
2031 | int i; |
2032 | ||
ffe60014 DG |
2033 | assert(chan); |
2034 | assert(chan->uchan); | |
e316aad5 | 2035 | |
ea88ca2a MD |
2036 | if (chan->switch_timer_enabled == 1) { |
2037 | consumer_timer_switch_stop(chan); | |
2038 | } | |
4628484a MD |
2039 | for (i = 0; i < chan->nr_stream_fds; i++) { |
2040 | int ret; | |
2041 | ||
2042 | ret = close(chan->stream_fds[i]); | |
2043 | if (ret) { | |
2044 | PERROR("close"); | |
2045 | } | |
2046 | if (chan->shm_path[0]) { | |
2047 | char shm_path[PATH_MAX]; | |
2048 | ||
2049 | ret = get_stream_shm_path(shm_path, chan->shm_path, i); | |
2050 | if (ret) { | |
2051 | ERR("Cannot get stream shm path"); | |
2052 | } | |
2053 | ret = run_as_unlink(shm_path, chan->uid, chan->gid); | |
2054 | if (ret) { | |
4628484a MD |
2055 | PERROR("unlink %s", shm_path); |
2056 | } | |
2057 | } | |
2058 | } | |
3bd1e081 MD |
2059 | } |
2060 | ||
b83e03c4 MD |
2061 | void lttng_ustconsumer_free_channel(struct lttng_consumer_channel *chan) |
2062 | { | |
2063 | assert(chan); | |
2064 | assert(chan->uchan); | |
2065 | ||
2066 | consumer_metadata_cache_destroy(chan); | |
2067 | ustctl_destroy_channel(chan->uchan); | |
ea853771 JR |
2068 | /* Try to rmdir all directories under shm_path root. */ |
2069 | if (chan->root_shm_path[0]) { | |
2070 | (void) run_as_recursive_rmdir(chan->root_shm_path, | |
2071 | chan->uid, chan->gid); | |
2072 | } | |
b83e03c4 MD |
2073 | free(chan->stream_fds); |
2074 | } | |
2075 | ||
3bd1e081 MD |
2076 | void lttng_ustconsumer_del_stream(struct lttng_consumer_stream *stream) |
2077 | { | |
ffe60014 DG |
2078 | assert(stream); |
2079 | assert(stream->ustream); | |
d41f73b7 | 2080 | |
ea88ca2a MD |
2081 | if (stream->chan->switch_timer_enabled == 1) { |
2082 | consumer_timer_switch_stop(stream->chan); | |
2083 | } | |
ffe60014 DG |
2084 | ustctl_destroy_stream(stream->ustream); |
2085 | } | |
d41f73b7 | 2086 | |
6d574024 DG |
2087 | int lttng_ustconsumer_get_wakeup_fd(struct lttng_consumer_stream *stream) |
2088 | { | |
2089 | assert(stream); | |
2090 | assert(stream->ustream); | |
2091 | ||
2092 | return ustctl_stream_get_wakeup_fd(stream->ustream); | |
2093 | } | |
2094 | ||
2095 | int lttng_ustconsumer_close_wakeup_fd(struct lttng_consumer_stream *stream) | |
2096 | { | |
2097 | assert(stream); | |
2098 | assert(stream->ustream); | |
2099 | ||
2100 | return ustctl_stream_close_wakeup_fd(stream->ustream); | |
2101 | } | |
2102 | ||
309167d2 JD |
2103 | /* |
2104 | * Populate index values of a UST stream. Values are set in big endian order. | |
2105 | * | |
2106 | * Return 0 on success or else a negative value. | |
2107 | */ | |
50adc264 | 2108 | static int get_index_values(struct ctf_packet_index *index, |
309167d2 JD |
2109 | struct ustctl_consumer_stream *ustream) |
2110 | { | |
2111 | int ret; | |
2112 | ||
2113 | ret = ustctl_get_timestamp_begin(ustream, &index->timestamp_begin); | |
2114 | if (ret < 0) { | |
2115 | PERROR("ustctl_get_timestamp_begin"); | |
2116 | goto error; | |
2117 | } | |
2118 | index->timestamp_begin = htobe64(index->timestamp_begin); | |
2119 | ||
2120 | ret = ustctl_get_timestamp_end(ustream, &index->timestamp_end); | |
2121 | if (ret < 0) { | |
2122 | PERROR("ustctl_get_timestamp_end"); | |
2123 | goto error; | |
2124 | } | |
2125 | index->timestamp_end = htobe64(index->timestamp_end); | |
2126 | ||
2127 | ret = ustctl_get_events_discarded(ustream, &index->events_discarded); | |
2128 | if (ret < 0) { | |
2129 | PERROR("ustctl_get_events_discarded"); | |
2130 | goto error; | |
2131 | } | |
2132 | index->events_discarded = htobe64(index->events_discarded); | |
2133 | ||
2134 | ret = ustctl_get_content_size(ustream, &index->content_size); | |
2135 | if (ret < 0) { | |
2136 | PERROR("ustctl_get_content_size"); | |
2137 | goto error; | |
2138 | } | |
2139 | index->content_size = htobe64(index->content_size); | |
2140 | ||
2141 | ret = ustctl_get_packet_size(ustream, &index->packet_size); | |
2142 | if (ret < 0) { | |
2143 | PERROR("ustctl_get_packet_size"); | |
2144 | goto error; | |
2145 | } | |
2146 | index->packet_size = htobe64(index->packet_size); | |
2147 | ||
2148 | ret = ustctl_get_stream_id(ustream, &index->stream_id); | |
2149 | if (ret < 0) { | |
2150 | PERROR("ustctl_get_stream_id"); | |
2151 | goto error; | |
2152 | } | |
2153 | index->stream_id = htobe64(index->stream_id); | |
2154 | ||
234cd636 JD |
2155 | ret = ustctl_get_instance_id(ustream, &index->stream_instance_id); |
2156 | if (ret < 0) { | |
2157 | PERROR("ustctl_get_instance_id"); | |
2158 | goto error; | |
2159 | } | |
2160 | index->stream_instance_id = htobe64(index->stream_instance_id); | |
2161 | ||
2162 | ret = ustctl_get_sequence_number(ustream, &index->packet_seq_num); | |
2163 | if (ret < 0) { | |
2164 | PERROR("ustctl_get_sequence_number"); | |
2165 | goto error; | |
2166 | } | |
2167 | index->packet_seq_num = htobe64(index->packet_seq_num); | |
2168 | ||
309167d2 JD |
2169 | error: |
2170 | return ret; | |
2171 | } | |
2172 | ||
93ec662e JD |
2173 | static |
2174 | void metadata_stream_reset_cache(struct lttng_consumer_stream *stream, | |
2175 | struct consumer_metadata_cache *cache) | |
2176 | { | |
2177 | DBG("Metadata stream update to version %" PRIu64, | |
2178 | cache->version); | |
2179 | stream->ust_metadata_pushed = 0; | |
2180 | stream->metadata_version = cache->version; | |
2181 | stream->reset_metadata_flag = 1; | |
2182 | } | |
2183 | ||
2184 | /* | |
2185 | * Check if the version of the metadata stream and metadata cache match. | |
2186 | * If the cache got updated, reset the metadata stream. | |
2187 | * The stream lock and metadata cache lock MUST be held. | |
2188 | * Return 0 on success, a negative value on error. | |
2189 | */ | |
2190 | static | |
2191 | int metadata_stream_check_version(struct lttng_consumer_stream *stream) | |
2192 | { | |
2193 | int ret = 0; | |
2194 | struct consumer_metadata_cache *cache = stream->chan->metadata_cache; | |
2195 | ||
2196 | if (cache->version == stream->metadata_version) { | |
2197 | goto end; | |
2198 | } | |
2199 | metadata_stream_reset_cache(stream, cache); | |
2200 | ||
2201 | end: | |
2202 | return ret; | |
2203 | } | |
2204 | ||
94d49140 JD |
2205 | /* |
2206 | * Write up to one packet from the metadata cache to the channel. | |
2207 | * | |
2208 | * Returns the number of bytes pushed in the cache, or a negative value | |
2209 | * on error. | |
2210 | */ | |
2211 | static | |
2212 | int commit_one_metadata_packet(struct lttng_consumer_stream *stream) | |
2213 | { | |
2214 | ssize_t write_len; | |
2215 | int ret; | |
2216 | ||
2217 | pthread_mutex_lock(&stream->chan->metadata_cache->lock); | |
93ec662e JD |
2218 | ret = metadata_stream_check_version(stream); |
2219 | if (ret < 0) { | |
2220 | goto end; | |
2221 | } | |
c585821b | 2222 | if (stream->chan->metadata_cache->max_offset |
94d49140 JD |
2223 | == stream->ust_metadata_pushed) { |
2224 | ret = 0; | |
2225 | goto end; | |
2226 | } | |
2227 | ||
2228 | write_len = ustctl_write_one_packet_to_channel(stream->chan->uchan, | |
2229 | &stream->chan->metadata_cache->data[stream->ust_metadata_pushed], | |
c585821b | 2230 | stream->chan->metadata_cache->max_offset |
94d49140 JD |
2231 | - stream->ust_metadata_pushed); |
2232 | assert(write_len != 0); | |
2233 | if (write_len < 0) { | |
2234 | ERR("Writing one metadata packet"); | |
2235 | ret = -1; | |
2236 | goto end; | |
2237 | } | |
2238 | stream->ust_metadata_pushed += write_len; | |
2239 | ||
c585821b | 2240 | assert(stream->chan->metadata_cache->max_offset >= |
94d49140 JD |
2241 | stream->ust_metadata_pushed); |
2242 | ret = write_len; | |
2243 | ||
2244 | end: | |
2245 | pthread_mutex_unlock(&stream->chan->metadata_cache->lock); | |
2246 | return ret; | |
2247 | } | |
2248 | ||
309167d2 | 2249 | |
94d49140 JD |
2250 | /* |
2251 | * Sync metadata meaning request them to the session daemon and snapshot to the | |
2252 | * metadata thread can consumer them. | |
2253 | * | |
c585821b MD |
2254 | * Metadata stream lock is held here, but we need to release it when |
2255 | * interacting with sessiond, else we cause a deadlock with live | |
2256 | * awaiting on metadata to be pushed out. | |
94d49140 JD |
2257 | * |
2258 | * Return 0 if new metadatda is available, EAGAIN if the metadata stream | |
2259 | * is empty or a negative value on error. | |
2260 | */ | |
2261 | int lttng_ustconsumer_sync_metadata(struct lttng_consumer_local_data *ctx, | |
2262 | struct lttng_consumer_stream *metadata) | |
2263 | { | |
2264 | int ret; | |
2265 | int retry = 0; | |
2266 | ||
2267 | assert(ctx); | |
2268 | assert(metadata); | |
2269 | ||
c585821b | 2270 | pthread_mutex_unlock(&metadata->lock); |
94d49140 JD |
2271 | /* |
2272 | * Request metadata from the sessiond, but don't wait for the flush | |
2273 | * because we locked the metadata thread. | |
2274 | */ | |
2275 | ret = lttng_ustconsumer_request_metadata(ctx, metadata->chan, 0, 0); | |
87f05398 | 2276 | pthread_mutex_lock(&metadata->lock); |
94d49140 JD |
2277 | if (ret < 0) { |
2278 | goto end; | |
2279 | } | |
2280 | ||
2281 | ret = commit_one_metadata_packet(metadata); | |
2282 | if (ret <= 0) { | |
2283 | goto end; | |
2284 | } else if (ret > 0) { | |
2285 | retry = 1; | |
2286 | } | |
2287 | ||
2288 | ustctl_flush_buffer(metadata->ustream, 1); | |
2289 | ret = ustctl_snapshot(metadata->ustream); | |
2290 | if (ret < 0) { | |
2291 | if (errno != EAGAIN) { | |
2292 | ERR("Sync metadata, taking UST snapshot"); | |
2293 | goto end; | |
2294 | } | |
2295 | DBG("No new metadata when syncing them."); | |
2296 | /* No new metadata, exit. */ | |
2297 | ret = ENODATA; | |
2298 | goto end; | |
2299 | } | |
2300 | ||
2301 | /* | |
2302 | * After this flush, we still need to extract metadata. | |
2303 | */ | |
2304 | if (retry) { | |
2305 | ret = EAGAIN; | |
2306 | } | |
2307 | ||
2308 | end: | |
2309 | return ret; | |
2310 | } | |
2311 | ||
02b3d176 DG |
2312 | /* |
2313 | * Return 0 on success else a negative value. | |
2314 | */ | |
2315 | static int notify_if_more_data(struct lttng_consumer_stream *stream, | |
2316 | struct lttng_consumer_local_data *ctx) | |
2317 | { | |
2318 | int ret; | |
2319 | struct ustctl_consumer_stream *ustream; | |
2320 | ||
2321 | assert(stream); | |
2322 | assert(ctx); | |
2323 | ||
2324 | ustream = stream->ustream; | |
2325 | ||
2326 | /* | |
2327 | * First, we are going to check if there is a new subbuffer available | |
2328 | * before reading the stream wait_fd. | |
2329 | */ | |
2330 | /* Get the next subbuffer */ | |
2331 | ret = ustctl_get_next_subbuf(ustream); | |
2332 | if (ret) { | |
2333 | /* No more data found, flag the stream. */ | |
2334 | stream->has_data = 0; | |
2335 | ret = 0; | |
2336 | goto end; | |
2337 | } | |
2338 | ||
5420e5db | 2339 | ret = ustctl_put_subbuf(ustream); |
02b3d176 DG |
2340 | assert(!ret); |
2341 | ||
2342 | /* This stream still has data. Flag it and wake up the data thread. */ | |
2343 | stream->has_data = 1; | |
2344 | ||
2345 | if (stream->monitor && !stream->hangup_flush_done && !ctx->has_wakeup) { | |
2346 | ssize_t writelen; | |
2347 | ||
2348 | writelen = lttng_pipe_write(ctx->consumer_wakeup_pipe, "!", 1); | |
2349 | if (writelen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) { | |
2350 | ret = writelen; | |
2351 | goto end; | |
2352 | } | |
2353 | ||
2354 | /* The wake up pipe has been notified. */ | |
2355 | ctx->has_wakeup = 1; | |
2356 | } | |
2357 | ret = 0; | |
2358 | ||
2359 | end: | |
2360 | return ret; | |
2361 | } | |
2362 | ||
fb83fe64 JD |
2363 | static |
2364 | int update_stream_stats(struct lttng_consumer_stream *stream) | |
2365 | { | |
2366 | int ret; | |
2367 | uint64_t seq, discarded; | |
2368 | ||
2369 | ret = ustctl_get_sequence_number(stream->ustream, &seq); | |
2370 | if (ret < 0) { | |
2371 | PERROR("ustctl_get_sequence_number"); | |
2372 | goto end; | |
2373 | } | |
2374 | /* | |
2375 | * Start the sequence when we extract the first packet in case we don't | |
2376 | * start at 0 (for example if a consumer is not connected to the | |
2377 | * session immediately after the beginning). | |
2378 | */ | |
2379 | if (stream->last_sequence_number == -1ULL) { | |
2380 | stream->last_sequence_number = seq; | |
2381 | } else if (seq > stream->last_sequence_number) { | |
2382 | stream->chan->lost_packets += seq - | |
2383 | stream->last_sequence_number - 1; | |
2384 | } else { | |
2385 | /* seq <= last_sequence_number */ | |
2386 | ERR("Sequence number inconsistent : prev = %" PRIu64 | |
2387 | ", current = %" PRIu64, | |
2388 | stream->last_sequence_number, seq); | |
2389 | ret = -1; | |
2390 | goto end; | |
2391 | } | |
2392 | stream->last_sequence_number = seq; | |
2393 | ||
2394 | ret = ustctl_get_events_discarded(stream->ustream, &discarded); | |
2395 | if (ret < 0) { | |
2396 | PERROR("kernctl_get_events_discarded"); | |
2397 | goto end; | |
2398 | } | |
2399 | if (discarded < stream->last_discarded_events) { | |
2400 | /* | |
83f4233d MJ |
2401 | * Overflow has occurred. We assume only one wrap-around |
2402 | * has occurred. | |
fb83fe64 JD |
2403 | */ |
2404 | stream->chan->discarded_events += | |
2405 | (1ULL << (CAA_BITS_PER_LONG - 1)) - | |
2406 | stream->last_discarded_events + discarded; | |
2407 | } else { | |
2408 | stream->chan->discarded_events += discarded - | |
2409 | stream->last_discarded_events; | |
2410 | } | |
2411 | stream->last_discarded_events = discarded; | |
2412 | ret = 0; | |
2413 | ||
2414 | end: | |
2415 | return ret; | |
2416 | } | |
2417 | ||
94d49140 JD |
2418 | /* |
2419 | * Read subbuffer from the given stream. | |
2420 | * | |
2421 | * Stream lock MUST be acquired. | |
2422 | * | |
2423 | * Return 0 on success else a negative value. | |
2424 | */ | |
d41f73b7 MD |
2425 | int lttng_ustconsumer_read_subbuffer(struct lttng_consumer_stream *stream, |
2426 | struct lttng_consumer_local_data *ctx) | |
2427 | { | |
1d4dfdef | 2428 | unsigned long len, subbuf_size, padding; |
1c20f0e2 | 2429 | int err, write_index = 1; |
d41f73b7 | 2430 | long ret = 0; |
ffe60014 | 2431 | struct ustctl_consumer_stream *ustream; |
50adc264 | 2432 | struct ctf_packet_index index; |
ffe60014 DG |
2433 | |
2434 | assert(stream); | |
2435 | assert(stream->ustream); | |
2436 | assert(ctx); | |
d41f73b7 | 2437 | |
3eb914c0 | 2438 | DBG("In UST read_subbuffer (wait_fd: %d, name: %s)", stream->wait_fd, |
ffe60014 DG |
2439 | stream->name); |
2440 | ||
2441 | /* Ease our life for what's next. */ | |
2442 | ustream = stream->ustream; | |
d41f73b7 | 2443 | |
6cd525e8 | 2444 | /* |
02b3d176 DG |
2445 | * We can consume the 1 byte written into the wait_fd by UST. Don't trigger |
2446 | * error if we cannot read this one byte (read returns 0), or if the error | |
2447 | * is EAGAIN or EWOULDBLOCK. | |
2448 | * | |
2449 | * This is only done when the stream is monitored by a thread, before the | |
2450 | * flush is done after a hangup and if the stream is not flagged with data | |
2451 | * since there might be nothing to consume in the wait fd but still have | |
2452 | * data available flagged by the consumer wake up pipe. | |
6cd525e8 | 2453 | */ |
02b3d176 DG |
2454 | if (stream->monitor && !stream->hangup_flush_done && !stream->has_data) { |
2455 | char dummy; | |
c617c0c6 MD |
2456 | ssize_t readlen; |
2457 | ||
6cd525e8 MD |
2458 | readlen = lttng_read(stream->wait_fd, &dummy, 1); |
2459 | if (readlen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) { | |
effcf122 MD |
2460 | ret = readlen; |
2461 | goto end; | |
2462 | } | |
d41f73b7 MD |
2463 | } |
2464 | ||
04ef1097 | 2465 | retry: |
d41f73b7 | 2466 | /* Get the next subbuffer */ |
ffe60014 | 2467 | err = ustctl_get_next_subbuf(ustream); |
d41f73b7 | 2468 | if (err != 0) { |
04ef1097 MD |
2469 | /* |
2470 | * Populate metadata info if the existing info has | |
2471 | * already been read. | |
2472 | */ | |
2473 | if (stream->metadata_flag) { | |
94d49140 JD |
2474 | ret = commit_one_metadata_packet(stream); |
2475 | if (ret <= 0) { | |
04ef1097 MD |
2476 | goto end; |
2477 | } | |
04ef1097 MD |
2478 | ustctl_flush_buffer(stream->ustream, 1); |
2479 | goto retry; | |
2480 | } | |
2481 | ||
1d4dfdef | 2482 | ret = err; /* ustctl_get_next_subbuf returns negative, caller expect positive. */ |
d41f73b7 MD |
2483 | /* |
2484 | * This is a debug message even for single-threaded consumer, | |
2485 | * because poll() have more relaxed criterions than get subbuf, | |
2486 | * so get_subbuf may fail for short race windows where poll() | |
2487 | * would issue wakeups. | |
2488 | */ | |
2489 | DBG("Reserving sub buffer failed (everything is normal, " | |
ffe60014 | 2490 | "it is due to concurrency) [ret: %d]", err); |
d41f73b7 MD |
2491 | goto end; |
2492 | } | |
ffe60014 | 2493 | assert(stream->chan->output == CONSUMER_CHANNEL_MMAP); |
309167d2 | 2494 | |
1c20f0e2 | 2495 | if (!stream->metadata_flag) { |
309167d2 JD |
2496 | index.offset = htobe64(stream->out_fd_offset); |
2497 | ret = get_index_values(&index, ustream); | |
2498 | if (ret < 0) { | |
becac7c4 MD |
2499 | err = ustctl_put_subbuf(ustream); |
2500 | assert(err == 0); | |
309167d2 JD |
2501 | goto end; |
2502 | } | |
fb83fe64 JD |
2503 | |
2504 | /* Update the stream's sequence and discarded events count. */ | |
2505 | ret = update_stream_stats(stream); | |
2506 | if (ret < 0) { | |
2507 | PERROR("kernctl_get_events_discarded"); | |
becac7c4 MD |
2508 | err = ustctl_put_subbuf(ustream); |
2509 | assert(err == 0); | |
fb83fe64 JD |
2510 | goto end; |
2511 | } | |
1c20f0e2 JD |
2512 | } else { |
2513 | write_index = 0; | |
309167d2 JD |
2514 | } |
2515 | ||
1d4dfdef | 2516 | /* Get the full padded subbuffer size */ |
ffe60014 | 2517 | err = ustctl_get_padded_subbuf_size(ustream, &len); |
effcf122 | 2518 | assert(err == 0); |
1d4dfdef DG |
2519 | |
2520 | /* Get subbuffer data size (without padding) */ | |
ffe60014 | 2521 | err = ustctl_get_subbuf_size(ustream, &subbuf_size); |
1d4dfdef DG |
2522 | assert(err == 0); |
2523 | ||
2524 | /* Make sure we don't get a subbuffer size bigger than the padded */ | |
2525 | assert(len >= subbuf_size); | |
2526 | ||
2527 | padding = len - subbuf_size; | |
d41f73b7 | 2528 | /* write the subbuffer to the tracefile */ |
309167d2 | 2529 | ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, padding, &index); |
91dfef6e DG |
2530 | /* |
2531 | * The mmap operation should write subbuf_size amount of data when network | |
2532 | * streaming or the full padding (len) size when we are _not_ streaming. | |
2533 | */ | |
d88aee68 DG |
2534 | if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) || |
2535 | (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) { | |
d41f73b7 | 2536 | /* |
91dfef6e | 2537 | * Display the error but continue processing to try to release the |
c5c45efa DG |
2538 | * subbuffer. This is a DBG statement since any unexpected kill or |
2539 | * signal, the application gets unregistered, relayd gets closed or | |
2540 | * anything that affects the buffer lifetime will trigger this error. | |
2541 | * So, for the sake of the user, don't print this error since it can | |
2542 | * happen and it is OK with the code flow. | |
d41f73b7 | 2543 | */ |
c5c45efa | 2544 | DBG("Error writing to tracefile " |
8fd623e0 | 2545 | "(ret: %ld != len: %lu != subbuf_size: %lu)", |
91dfef6e | 2546 | ret, len, subbuf_size); |
309167d2 | 2547 | write_index = 0; |
d41f73b7 | 2548 | } |
ffe60014 | 2549 | err = ustctl_put_next_subbuf(ustream); |
effcf122 | 2550 | assert(err == 0); |
331744e3 | 2551 | |
02b3d176 DG |
2552 | /* |
2553 | * This will consumer the byte on the wait_fd if and only if there is not | |
2554 | * next subbuffer to be acquired. | |
2555 | */ | |
2556 | if (!stream->metadata_flag) { | |
2557 | ret = notify_if_more_data(stream, ctx); | |
2558 | if (ret < 0) { | |
2559 | goto end; | |
2560 | } | |
2561 | } | |
2562 | ||
309167d2 | 2563 | /* Write index if needed. */ |
1c20f0e2 JD |
2564 | if (!write_index) { |
2565 | goto end; | |
2566 | } | |
2567 | ||
94d49140 JD |
2568 | if (stream->chan->live_timer_interval && !stream->metadata_flag) { |
2569 | /* | |
2570 | * In live, block until all the metadata is sent. | |
2571 | */ | |
c585821b MD |
2572 | pthread_mutex_lock(&stream->metadata_timer_lock); |
2573 | assert(!stream->missed_metadata_flush); | |
2574 | stream->waiting_on_metadata = true; | |
2575 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
2576 | ||
94d49140 | 2577 | err = consumer_stream_sync_metadata(ctx, stream->session_id); |
c585821b MD |
2578 | |
2579 | pthread_mutex_lock(&stream->metadata_timer_lock); | |
2580 | stream->waiting_on_metadata = false; | |
2581 | if (stream->missed_metadata_flush) { | |
2582 | stream->missed_metadata_flush = false; | |
2583 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
2584 | (void) consumer_flush_ust_index(stream); | |
2585 | } else { | |
2586 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
2587 | } | |
2588 | ||
94d49140 JD |
2589 | if (err < 0) { |
2590 | goto end; | |
2591 | } | |
2592 | } | |
2593 | ||
1c20f0e2 JD |
2594 | assert(!stream->metadata_flag); |
2595 | err = consumer_stream_write_index(stream, &index); | |
2596 | if (err < 0) { | |
2597 | goto end; | |
309167d2 JD |
2598 | } |
2599 | ||
d41f73b7 MD |
2600 | end: |
2601 | return ret; | |
2602 | } | |
2603 | ||
ffe60014 DG |
2604 | /* |
2605 | * Called when a stream is created. | |
fe4477ee JD |
2606 | * |
2607 | * Return 0 on success or else a negative value. | |
ffe60014 | 2608 | */ |
d41f73b7 MD |
2609 | int lttng_ustconsumer_on_recv_stream(struct lttng_consumer_stream *stream) |
2610 | { | |
fe4477ee JD |
2611 | int ret; |
2612 | ||
10a50311 JD |
2613 | assert(stream); |
2614 | ||
fe4477ee | 2615 | /* Don't create anything if this is set for streaming. */ |
10a50311 | 2616 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor) { |
fe4477ee JD |
2617 | ret = utils_create_stream_file(stream->chan->pathname, stream->name, |
2618 | stream->chan->tracefile_size, stream->tracefile_count_current, | |
309167d2 | 2619 | stream->uid, stream->gid, NULL); |
fe4477ee JD |
2620 | if (ret < 0) { |
2621 | goto error; | |
2622 | } | |
2623 | stream->out_fd = ret; | |
2624 | stream->tracefile_size_current = 0; | |
309167d2 JD |
2625 | |
2626 | if (!stream->metadata_flag) { | |
e0547b83 MD |
2627 | struct lttng_index_file *index_file; |
2628 | ||
2629 | index_file = lttng_index_file_create(stream->chan->pathname, | |
309167d2 JD |
2630 | stream->name, stream->uid, stream->gid, |
2631 | stream->chan->tracefile_size, | |
e0547b83 MD |
2632 | stream->tracefile_count_current, |
2633 | CTF_INDEX_MAJOR, CTF_INDEX_MINOR); | |
2634 | if (!index_file) { | |
309167d2 JD |
2635 | goto error; |
2636 | } | |
e0547b83 | 2637 | stream->index_file = index_file; |
309167d2 | 2638 | } |
fe4477ee JD |
2639 | } |
2640 | ret = 0; | |
2641 | ||
2642 | error: | |
2643 | return ret; | |
d41f73b7 | 2644 | } |
ca22feea DG |
2645 | |
2646 | /* | |
2647 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
2648 | * stream. Consumer data lock MUST be acquired before calling this function |
2649 | * and the stream lock. | |
ca22feea | 2650 | * |
6d805429 | 2651 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
2652 | * data is available for trace viewer reading. |
2653 | */ | |
6d805429 | 2654 | int lttng_ustconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
2655 | { |
2656 | int ret; | |
2657 | ||
2658 | assert(stream); | |
ffe60014 | 2659 | assert(stream->ustream); |
ca22feea | 2660 | |
6d805429 | 2661 | DBG("UST consumer checking data pending"); |
c8f59ee5 | 2662 | |
ca6b395f MD |
2663 | if (stream->endpoint_status != CONSUMER_ENDPOINT_ACTIVE) { |
2664 | ret = 0; | |
2665 | goto end; | |
2666 | } | |
2667 | ||
04ef1097 | 2668 | if (stream->chan->type == CONSUMER_CHANNEL_TYPE_METADATA) { |
e6ee4eab DG |
2669 | uint64_t contiguous, pushed; |
2670 | ||
2671 | /* Ease our life a bit. */ | |
c585821b | 2672 | contiguous = stream->chan->metadata_cache->max_offset; |
e6ee4eab DG |
2673 | pushed = stream->ust_metadata_pushed; |
2674 | ||
04ef1097 MD |
2675 | /* |
2676 | * We can simply check whether all contiguously available data | |
2677 | * has been pushed to the ring buffer, since the push operation | |
2678 | * is performed within get_next_subbuf(), and because both | |
2679 | * get_next_subbuf() and put_next_subbuf() are issued atomically | |
2680 | * thanks to the stream lock within | |
2681 | * lttng_ustconsumer_read_subbuffer(). This basically means that | |
2682 | * whetnever ust_metadata_pushed is incremented, the associated | |
2683 | * metadata has been consumed from the metadata stream. | |
2684 | */ | |
2685 | DBG("UST consumer metadata pending check: contiguous %" PRIu64 " vs pushed %" PRIu64, | |
e6ee4eab | 2686 | contiguous, pushed); |
aa01b94c | 2687 | assert(((int64_t) (contiguous - pushed)) >= 0); |
e6ee4eab | 2688 | if ((contiguous != pushed) || |
6acdf328 | 2689 | (((int64_t) contiguous - pushed) > 0 || contiguous == 0)) { |
04ef1097 MD |
2690 | ret = 1; /* Data is pending */ |
2691 | goto end; | |
2692 | } | |
2693 | } else { | |
2694 | ret = ustctl_get_next_subbuf(stream->ustream); | |
2695 | if (ret == 0) { | |
2696 | /* | |
2697 | * There is still data so let's put back this | |
2698 | * subbuffer. | |
2699 | */ | |
2700 | ret = ustctl_put_subbuf(stream->ustream); | |
2701 | assert(ret == 0); | |
2702 | ret = 1; /* Data is pending */ | |
2703 | goto end; | |
2704 | } | |
ca22feea DG |
2705 | } |
2706 | ||
6d805429 DG |
2707 | /* Data is NOT pending so ready to be read. */ |
2708 | ret = 0; | |
ca22feea | 2709 | |
6efae65e DG |
2710 | end: |
2711 | return ret; | |
ca22feea | 2712 | } |
d88aee68 | 2713 | |
6d574024 DG |
2714 | /* |
2715 | * Stop a given metadata channel timer if enabled and close the wait fd which | |
2716 | * is the poll pipe of the metadata stream. | |
2717 | * | |
2718 | * This MUST be called with the metadata channel acquired. | |
2719 | */ | |
2720 | void lttng_ustconsumer_close_metadata(struct lttng_consumer_channel *metadata) | |
2721 | { | |
2722 | int ret; | |
2723 | ||
2724 | assert(metadata); | |
2725 | assert(metadata->type == CONSUMER_CHANNEL_TYPE_METADATA); | |
2726 | ||
2727 | DBG("Closing metadata channel key %" PRIu64, metadata->key); | |
2728 | ||
2729 | if (metadata->switch_timer_enabled == 1) { | |
2730 | consumer_timer_switch_stop(metadata); | |
2731 | } | |
2732 | ||
2733 | if (!metadata->metadata_stream) { | |
2734 | goto end; | |
2735 | } | |
2736 | ||
2737 | /* | |
2738 | * Closing write side so the thread monitoring the stream wakes up if any | |
2739 | * and clean the metadata stream. | |
2740 | */ | |
2741 | if (metadata->metadata_stream->ust_metadata_poll_pipe[1] >= 0) { | |
2742 | ret = close(metadata->metadata_stream->ust_metadata_poll_pipe[1]); | |
2743 | if (ret < 0) { | |
2744 | PERROR("closing metadata pipe write side"); | |
2745 | } | |
2746 | metadata->metadata_stream->ust_metadata_poll_pipe[1] = -1; | |
2747 | } | |
2748 | ||
2749 | end: | |
2750 | return; | |
2751 | } | |
2752 | ||
d88aee68 DG |
2753 | /* |
2754 | * Close every metadata stream wait fd of the metadata hash table. This | |
2755 | * function MUST be used very carefully so not to run into a race between the | |
2756 | * metadata thread handling streams and this function closing their wait fd. | |
2757 | * | |
2758 | * For UST, this is used when the session daemon hangs up. Its the metadata | |
2759 | * producer so calling this is safe because we are assured that no state change | |
2760 | * can occur in the metadata thread for the streams in the hash table. | |
2761 | */ | |
6d574024 | 2762 | void lttng_ustconsumer_close_all_metadata(struct lttng_ht *metadata_ht) |
d88aee68 | 2763 | { |
d88aee68 DG |
2764 | struct lttng_ht_iter iter; |
2765 | struct lttng_consumer_stream *stream; | |
2766 | ||
2767 | assert(metadata_ht); | |
2768 | assert(metadata_ht->ht); | |
2769 | ||
2770 | DBG("UST consumer closing all metadata streams"); | |
2771 | ||
2772 | rcu_read_lock(); | |
2773 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, | |
2774 | node.node) { | |
9ce5646a MD |
2775 | |
2776 | health_code_update(); | |
2777 | ||
be2b50c7 | 2778 | pthread_mutex_lock(&stream->chan->lock); |
6d574024 | 2779 | lttng_ustconsumer_close_metadata(stream->chan); |
be2b50c7 DG |
2780 | pthread_mutex_unlock(&stream->chan->lock); |
2781 | ||
d88aee68 DG |
2782 | } |
2783 | rcu_read_unlock(); | |
2784 | } | |
d8ef542d MD |
2785 | |
2786 | void lttng_ustconsumer_close_stream_wakeup(struct lttng_consumer_stream *stream) | |
2787 | { | |
2788 | int ret; | |
2789 | ||
2790 | ret = ustctl_stream_close_wakeup_fd(stream->ustream); | |
2791 | if (ret < 0) { | |
2792 | ERR("Unable to close wakeup fd"); | |
2793 | } | |
2794 | } | |
331744e3 | 2795 | |
f666ae70 MD |
2796 | /* |
2797 | * Please refer to consumer-timer.c before adding any lock within this | |
2798 | * function or any of its callees. Timers have a very strict locking | |
2799 | * semantic with respect to teardown. Failure to respect this semantic | |
2800 | * introduces deadlocks. | |
c585821b MD |
2801 | * |
2802 | * DON'T hold the metadata lock when calling this function, else this | |
2803 | * can cause deadlock involving consumer awaiting for metadata to be | |
2804 | * pushed out due to concurrent interaction with the session daemon. | |
f666ae70 | 2805 | */ |
331744e3 | 2806 | int lttng_ustconsumer_request_metadata(struct lttng_consumer_local_data *ctx, |
94d49140 | 2807 | struct lttng_consumer_channel *channel, int timer, int wait) |
331744e3 JD |
2808 | { |
2809 | struct lttcomm_metadata_request_msg request; | |
2810 | struct lttcomm_consumer_msg msg; | |
0c759fc9 | 2811 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
93ec662e | 2812 | uint64_t len, key, offset, version; |
331744e3 JD |
2813 | int ret; |
2814 | ||
2815 | assert(channel); | |
2816 | assert(channel->metadata_cache); | |
2817 | ||
53efb85a MD |
2818 | memset(&request, 0, sizeof(request)); |
2819 | ||
331744e3 JD |
2820 | /* send the metadata request to sessiond */ |
2821 | switch (consumer_data.type) { | |
2822 | case LTTNG_CONSUMER64_UST: | |
2823 | request.bits_per_long = 64; | |
2824 | break; | |
2825 | case LTTNG_CONSUMER32_UST: | |
2826 | request.bits_per_long = 32; | |
2827 | break; | |
2828 | default: | |
2829 | request.bits_per_long = 0; | |
2830 | break; | |
2831 | } | |
2832 | ||
2833 | request.session_id = channel->session_id; | |
1950109e | 2834 | request.session_id_per_pid = channel->session_id_per_pid; |
567eb353 DG |
2835 | /* |
2836 | * Request the application UID here so the metadata of that application can | |
2837 | * be sent back. The channel UID corresponds to the user UID of the session | |
2838 | * used for the rights on the stream file(s). | |
2839 | */ | |
2840 | request.uid = channel->ust_app_uid; | |
331744e3 | 2841 | request.key = channel->key; |
567eb353 | 2842 | |
1950109e | 2843 | DBG("Sending metadata request to sessiond, session id %" PRIu64 |
567eb353 DG |
2844 | ", per-pid %" PRIu64 ", app UID %u and channek key %" PRIu64, |
2845 | request.session_id, request.session_id_per_pid, request.uid, | |
2846 | request.key); | |
331744e3 | 2847 | |
75d83e50 | 2848 | pthread_mutex_lock(&ctx->metadata_socket_lock); |
9ce5646a MD |
2849 | |
2850 | health_code_update(); | |
2851 | ||
331744e3 JD |
2852 | ret = lttcomm_send_unix_sock(ctx->consumer_metadata_socket, &request, |
2853 | sizeof(request)); | |
2854 | if (ret < 0) { | |
2855 | ERR("Asking metadata to sessiond"); | |
2856 | goto end; | |
2857 | } | |
2858 | ||
9ce5646a MD |
2859 | health_code_update(); |
2860 | ||
331744e3 JD |
2861 | /* Receive the metadata from sessiond */ |
2862 | ret = lttcomm_recv_unix_sock(ctx->consumer_metadata_socket, &msg, | |
2863 | sizeof(msg)); | |
2864 | if (ret != sizeof(msg)) { | |
8fd623e0 | 2865 | DBG("Consumer received unexpected message size %d (expects %zu)", |
331744e3 JD |
2866 | ret, sizeof(msg)); |
2867 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); | |
2868 | /* | |
2869 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
2870 | * since the caller handles this. | |
2871 | */ | |
2872 | goto end; | |
2873 | } | |
2874 | ||
9ce5646a MD |
2875 | health_code_update(); |
2876 | ||
331744e3 JD |
2877 | if (msg.cmd_type == LTTNG_ERR_UND) { |
2878 | /* No registry found */ | |
2879 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, | |
2880 | ret_code); | |
2881 | ret = 0; | |
2882 | goto end; | |
2883 | } else if (msg.cmd_type != LTTNG_CONSUMER_PUSH_METADATA) { | |
2884 | ERR("Unexpected cmd_type received %d", msg.cmd_type); | |
2885 | ret = -1; | |
2886 | goto end; | |
2887 | } | |
2888 | ||
2889 | len = msg.u.push_metadata.len; | |
2890 | key = msg.u.push_metadata.key; | |
2891 | offset = msg.u.push_metadata.target_offset; | |
93ec662e | 2892 | version = msg.u.push_metadata.version; |
331744e3 JD |
2893 | |
2894 | assert(key == channel->key); | |
2895 | if (len == 0) { | |
2896 | DBG("No new metadata to receive for key %" PRIu64, key); | |
2897 | } | |
2898 | ||
9ce5646a MD |
2899 | health_code_update(); |
2900 | ||
331744e3 JD |
2901 | /* Tell session daemon we are ready to receive the metadata. */ |
2902 | ret = consumer_send_status_msg(ctx->consumer_metadata_socket, | |
0c759fc9 | 2903 | LTTCOMM_CONSUMERD_SUCCESS); |
331744e3 JD |
2904 | if (ret < 0 || len == 0) { |
2905 | /* | |
2906 | * Somehow, the session daemon is not responding anymore or there is | |
2907 | * nothing to receive. | |
2908 | */ | |
2909 | goto end; | |
2910 | } | |
2911 | ||
9ce5646a MD |
2912 | health_code_update(); |
2913 | ||
1eb682be | 2914 | ret = lttng_ustconsumer_recv_metadata(ctx->consumer_metadata_socket, |
93ec662e | 2915 | key, offset, len, version, channel, timer, wait); |
1eb682be | 2916 | if (ret >= 0) { |
f2a444f1 DG |
2917 | /* |
2918 | * Only send the status msg if the sessiond is alive meaning a positive | |
2919 | * ret code. | |
2920 | */ | |
1eb682be | 2921 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, ret); |
f2a444f1 | 2922 | } |
331744e3 JD |
2923 | ret = 0; |
2924 | ||
2925 | end: | |
9ce5646a MD |
2926 | health_code_update(); |
2927 | ||
75d83e50 | 2928 | pthread_mutex_unlock(&ctx->metadata_socket_lock); |
331744e3 JD |
2929 | return ret; |
2930 | } | |
70190e1c DG |
2931 | |
2932 | /* | |
2933 | * Return the ustctl call for the get stream id. | |
2934 | */ | |
2935 | int lttng_ustconsumer_get_stream_id(struct lttng_consumer_stream *stream, | |
2936 | uint64_t *stream_id) | |
2937 | { | |
2938 | assert(stream); | |
2939 | assert(stream_id); | |
2940 | ||
2941 | return ustctl_get_stream_id(stream->ustream, stream_id); | |
2942 | } |