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 | ||
19 | #define _GNU_SOURCE | |
6c1c0768 | 20 | #define _LGPL_SOURCE |
3bd1e081 | 21 | #include <assert.h> |
f02e1e8a | 22 | #include <lttng/ust-ctl.h> |
3bd1e081 MD |
23 | #include <poll.h> |
24 | #include <pthread.h> | |
25 | #include <stdlib.h> | |
26 | #include <string.h> | |
27 | #include <sys/mman.h> | |
28 | #include <sys/socket.h> | |
dbb5dfe6 | 29 | #include <sys/stat.h> |
3bd1e081 | 30 | #include <sys/types.h> |
77c7c900 | 31 | #include <inttypes.h> |
3bd1e081 | 32 | #include <unistd.h> |
ffe60014 | 33 | #include <urcu/list.h> |
331744e3 | 34 | #include <signal.h> |
0857097f | 35 | |
51a9e1c7 | 36 | #include <bin/lttng-consumerd/health-consumerd.h> |
990570ed | 37 | #include <common/common.h> |
10a8a223 | 38 | #include <common/sessiond-comm/sessiond-comm.h> |
00e2e675 | 39 | #include <common/relayd/relayd.h> |
dbb5dfe6 | 40 | #include <common/compat/fcntl.h> |
f263b7fd | 41 | #include <common/compat/endian.h> |
331744e3 | 42 | #include <common/consumer-metadata-cache.h> |
10a50311 | 43 | #include <common/consumer-stream.h> |
331744e3 | 44 | #include <common/consumer-timer.h> |
fe4477ee | 45 | #include <common/utils.h> |
309167d2 | 46 | #include <common/index/index.h> |
10a8a223 DG |
47 | |
48 | #include "ust-consumer.h" | |
3bd1e081 | 49 | |
4628484a MD |
50 | #define UINT_MAX_STR_LEN 11 /* includes \0 */ |
51 | ||
3bd1e081 MD |
52 | extern struct lttng_consumer_global_data consumer_data; |
53 | extern int consumer_poll_timeout; | |
54 | extern volatile int consumer_quit; | |
55 | ||
56 | /* | |
ffe60014 DG |
57 | * Free channel object and all streams associated with it. This MUST be used |
58 | * only and only if the channel has _NEVER_ been added to the global channel | |
59 | * hash table. | |
3bd1e081 | 60 | */ |
ffe60014 | 61 | static void destroy_channel(struct lttng_consumer_channel *channel) |
3bd1e081 | 62 | { |
ffe60014 DG |
63 | struct lttng_consumer_stream *stream, *stmp; |
64 | ||
65 | assert(channel); | |
66 | ||
67 | DBG("UST consumer cleaning stream list"); | |
68 | ||
69 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
70 | send_node) { | |
9ce5646a MD |
71 | |
72 | health_code_update(); | |
73 | ||
ffe60014 DG |
74 | cds_list_del(&stream->send_node); |
75 | ustctl_destroy_stream(stream->ustream); | |
76 | free(stream); | |
77 | } | |
78 | ||
79 | /* | |
80 | * If a channel is available meaning that was created before the streams | |
81 | * were, delete it. | |
82 | */ | |
83 | if (channel->uchan) { | |
84 | lttng_ustconsumer_del_channel(channel); | |
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 | { | |
250 | char cpu_nr[UINT_MAX_STR_LEN]; /* unsigned int max len */ | |
251 | int ret; | |
252 | ||
253 | strncpy(stream_shm_path, shm_path, PATH_MAX); | |
254 | stream_shm_path[PATH_MAX - 1] = '\0'; | |
255 | ret = snprintf(cpu_nr, UINT_MAX_STR_LEN, "%u", cpu); | |
256 | if (ret != 1) { | |
257 | ret = -1; | |
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; | |
04ef1097 MD |
355 | stream->ust_metadata_poll_pipe[0] = ust_metadata_pipe[0]; |
356 | stream->ust_metadata_poll_pipe[1] = ust_metadata_pipe[1]; | |
d88aee68 | 357 | } |
ffe60014 DG |
358 | } |
359 | ||
360 | return 0; | |
361 | ||
362 | error: | |
363 | error_alloc: | |
364 | return ret; | |
365 | } | |
366 | ||
4628484a MD |
367 | /* |
368 | * create_posix_shm is never called concurrently within a process. | |
369 | */ | |
370 | static | |
371 | int create_posix_shm(void) | |
372 | { | |
373 | char tmp_name[NAME_MAX]; | |
374 | int shmfd, ret; | |
375 | ||
376 | ret = snprintf(tmp_name, NAME_MAX, "/ust-shm-consumer-%d", getpid()); | |
377 | if (ret < 0) { | |
378 | PERROR("snprintf"); | |
379 | return -1; | |
380 | } | |
381 | /* | |
382 | * Allocate shm, and immediately unlink its shm oject, keeping | |
383 | * only the file descriptor as a reference to the object. | |
384 | * We specifically do _not_ use the / at the beginning of the | |
385 | * pathname so that some OS implementations can keep it local to | |
386 | * the process (POSIX leaves this implementation-defined). | |
387 | */ | |
388 | shmfd = shm_open(tmp_name, O_CREAT | O_EXCL | O_RDWR, 0700); | |
389 | if (shmfd < 0) { | |
390 | PERROR("shm_open"); | |
391 | goto error_shm_open; | |
392 | } | |
393 | ret = shm_unlink(tmp_name); | |
394 | if (ret < 0 && errno != ENOENT) { | |
395 | PERROR("shm_unlink"); | |
396 | goto error_shm_release; | |
397 | } | |
398 | return shmfd; | |
399 | ||
400 | error_shm_release: | |
401 | ret = close(shmfd); | |
402 | if (ret) { | |
403 | PERROR("close"); | |
404 | } | |
405 | error_shm_open: | |
406 | return -1; | |
407 | } | |
408 | ||
409 | static int open_ust_stream_fd(struct lttng_consumer_channel *channel, | |
410 | struct ustctl_consumer_channel_attr *attr, | |
411 | int cpu) | |
412 | { | |
413 | char shm_path[PATH_MAX]; | |
414 | int ret; | |
415 | ||
416 | if (!channel->shm_path[0]) { | |
417 | return create_posix_shm(); | |
418 | } | |
419 | ret = get_stream_shm_path(shm_path, channel->shm_path, cpu); | |
420 | if (ret) { | |
421 | goto error_shm_path; | |
422 | } | |
423 | return run_as_open(shm_path, | |
424 | O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR, | |
425 | channel->uid, channel->gid); | |
426 | ||
427 | error_shm_path: | |
428 | return -1; | |
429 | } | |
430 | ||
ffe60014 DG |
431 | /* |
432 | * Create an UST channel with the given attributes and send it to the session | |
433 | * daemon using the ust ctl API. | |
434 | * | |
435 | * Return 0 on success or else a negative value. | |
436 | */ | |
4628484a MD |
437 | static int create_ust_channel(struct lttng_consumer_channel *channel, |
438 | struct ustctl_consumer_channel_attr *attr, | |
439 | struct ustctl_consumer_channel **ust_chanp) | |
ffe60014 | 440 | { |
4628484a MD |
441 | int ret, nr_stream_fds, i, j; |
442 | int *stream_fds; | |
443 | struct ustctl_consumer_channel *ust_channel; | |
ffe60014 | 444 | |
4628484a | 445 | assert(channel); |
ffe60014 | 446 | assert(attr); |
4628484a | 447 | assert(ust_chanp); |
ffe60014 DG |
448 | |
449 | DBG3("Creating channel to ustctl with attr: [overwrite: %d, " | |
450 | "subbuf_size: %" PRIu64 ", num_subbuf: %" PRIu64 ", " | |
451 | "switch_timer_interval: %u, read_timer_interval: %u, " | |
452 | "output: %d, type: %d", attr->overwrite, attr->subbuf_size, | |
453 | attr->num_subbuf, attr->switch_timer_interval, | |
454 | attr->read_timer_interval, attr->output, attr->type); | |
455 | ||
4628484a MD |
456 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) |
457 | nr_stream_fds = 1; | |
458 | else | |
459 | nr_stream_fds = ustctl_get_nr_stream_per_channel(); | |
460 | stream_fds = zmalloc(nr_stream_fds * sizeof(*stream_fds)); | |
461 | if (!stream_fds) { | |
462 | ret = -1; | |
463 | goto error_alloc; | |
464 | } | |
465 | for (i = 0; i < nr_stream_fds; i++) { | |
466 | stream_fds[i] = open_ust_stream_fd(channel, attr, i); | |
467 | if (stream_fds[i] < 0) { | |
468 | ret = -1; | |
469 | goto error_open; | |
470 | } | |
471 | } | |
472 | ust_channel = ustctl_create_channel(attr, stream_fds, nr_stream_fds); | |
473 | if (!ust_channel) { | |
ffe60014 DG |
474 | ret = -1; |
475 | goto error_create; | |
476 | } | |
4628484a MD |
477 | channel->nr_stream_fds = nr_stream_fds; |
478 | channel->stream_fds = stream_fds; | |
479 | *ust_chanp = ust_channel; | |
ffe60014 DG |
480 | |
481 | return 0; | |
482 | ||
483 | error_create: | |
4628484a MD |
484 | error_open: |
485 | for (j = i - 1; j >= 0; j--) { | |
486 | int closeret; | |
487 | ||
488 | closeret = close(stream_fds[j]); | |
489 | if (closeret) { | |
490 | PERROR("close"); | |
491 | } | |
492 | if (channel->shm_path[0]) { | |
493 | char shm_path[PATH_MAX]; | |
494 | ||
495 | closeret = get_stream_shm_path(shm_path, | |
496 | channel->shm_path, j); | |
497 | if (closeret) { | |
498 | ERR("Cannot get stream shm path"); | |
499 | } | |
500 | closeret = run_as_unlink(shm_path, | |
501 | channel->uid, channel->gid); | |
502 | if (closeret) { | |
503 | errno = -closeret; | |
504 | PERROR("unlink %s", shm_path); | |
505 | } | |
506 | } | |
507 | } | |
508 | /* Try to rmdir all directories under shm_path root. */ | |
509 | if (channel->root_shm_path[0]) { | |
510 | (void) run_as_recursive_rmdir(channel->root_shm_path, | |
511 | channel->uid, channel->gid); | |
512 | } | |
513 | free(stream_fds); | |
514 | error_alloc: | |
ffe60014 DG |
515 | return ret; |
516 | } | |
517 | ||
d88aee68 DG |
518 | /* |
519 | * Send a single given stream to the session daemon using the sock. | |
520 | * | |
521 | * Return 0 on success else a negative value. | |
522 | */ | |
ffe60014 DG |
523 | static int send_sessiond_stream(int sock, struct lttng_consumer_stream *stream) |
524 | { | |
525 | int ret; | |
526 | ||
527 | assert(stream); | |
528 | assert(sock >= 0); | |
529 | ||
3eb914c0 | 530 | DBG("UST consumer sending stream %" PRIu64 " to sessiond", stream->key); |
ffe60014 DG |
531 | |
532 | /* Send stream to session daemon. */ | |
533 | ret = ustctl_send_stream_to_sessiond(sock, stream->ustream); | |
534 | if (ret < 0) { | |
535 | goto error; | |
536 | } | |
537 | ||
ffe60014 DG |
538 | error: |
539 | return ret; | |
540 | } | |
541 | ||
542 | /* | |
543 | * Send channel to sessiond. | |
544 | * | |
d88aee68 | 545 | * Return 0 on success or else a negative value. |
ffe60014 DG |
546 | */ |
547 | static int send_sessiond_channel(int sock, | |
548 | struct lttng_consumer_channel *channel, | |
549 | struct lttng_consumer_local_data *ctx, int *relayd_error) | |
550 | { | |
0c759fc9 | 551 | int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
ffe60014 | 552 | struct lttng_consumer_stream *stream; |
a4baae1b | 553 | uint64_t net_seq_idx = -1ULL; |
ffe60014 DG |
554 | |
555 | assert(channel); | |
556 | assert(ctx); | |
557 | assert(sock >= 0); | |
558 | ||
559 | DBG("UST consumer sending channel %s to sessiond", channel->name); | |
560 | ||
62285ea4 DG |
561 | if (channel->relayd_id != (uint64_t) -1ULL) { |
562 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
563 | |
564 | health_code_update(); | |
565 | ||
62285ea4 DG |
566 | /* Try to send the stream to the relayd if one is available. */ |
567 | ret = consumer_send_relayd_stream(stream, stream->chan->pathname); | |
568 | if (ret < 0) { | |
569 | /* | |
570 | * Flag that the relayd was the problem here probably due to a | |
571 | * communicaton error on the socket. | |
572 | */ | |
573 | if (relayd_error) { | |
574 | *relayd_error = 1; | |
575 | } | |
725d28b2 | 576 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
ffe60014 | 577 | } |
a4baae1b JD |
578 | if (net_seq_idx == -1ULL) { |
579 | net_seq_idx = stream->net_seq_idx; | |
580 | } | |
581 | } | |
f2a444f1 | 582 | } |
ffe60014 | 583 | |
f2a444f1 DG |
584 | /* Inform sessiond that we are about to send channel and streams. */ |
585 | ret = consumer_send_status_msg(sock, ret_code); | |
0c759fc9 | 586 | if (ret < 0 || ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
f2a444f1 DG |
587 | /* |
588 | * Either the session daemon is not responding or the relayd died so we | |
589 | * stop now. | |
590 | */ | |
591 | goto error; | |
592 | } | |
593 | ||
594 | /* Send channel to sessiond. */ | |
595 | ret = ustctl_send_channel_to_sessiond(sock, channel->uchan); | |
596 | if (ret < 0) { | |
597 | goto error; | |
598 | } | |
599 | ||
600 | ret = ustctl_channel_close_wakeup_fd(channel->uchan); | |
601 | if (ret < 0) { | |
602 | goto error; | |
603 | } | |
604 | ||
605 | /* The channel was sent successfully to the sessiond at this point. */ | |
606 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
607 | |
608 | health_code_update(); | |
609 | ||
ffe60014 DG |
610 | /* Send stream to session daemon. */ |
611 | ret = send_sessiond_stream(sock, stream); | |
612 | if (ret < 0) { | |
613 | goto error; | |
614 | } | |
615 | } | |
616 | ||
617 | /* Tell sessiond there is no more stream. */ | |
618 | ret = ustctl_send_stream_to_sessiond(sock, NULL); | |
619 | if (ret < 0) { | |
620 | goto error; | |
621 | } | |
622 | ||
623 | DBG("UST consumer NULL stream sent to sessiond"); | |
624 | ||
625 | return 0; | |
626 | ||
627 | error: | |
0c759fc9 | 628 | if (ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
f2a444f1 DG |
629 | ret = -1; |
630 | } | |
ffe60014 DG |
631 | return ret; |
632 | } | |
633 | ||
634 | /* | |
635 | * Creates a channel and streams and add the channel it to the channel internal | |
636 | * state. The created stream must ONLY be sent once the GET_CHANNEL command is | |
637 | * received. | |
638 | * | |
639 | * Return 0 on success or else, a negative value is returned and the channel | |
640 | * MUST be destroyed by consumer_del_channel(). | |
641 | */ | |
642 | static int ask_channel(struct lttng_consumer_local_data *ctx, int sock, | |
643 | struct lttng_consumer_channel *channel, | |
644 | struct ustctl_consumer_channel_attr *attr) | |
3bd1e081 MD |
645 | { |
646 | int ret; | |
647 | ||
ffe60014 DG |
648 | assert(ctx); |
649 | assert(channel); | |
650 | assert(attr); | |
651 | ||
652 | /* | |
653 | * This value is still used by the kernel consumer since for the kernel, | |
654 | * the stream ownership is not IN the consumer so we need to have the | |
655 | * number of left stream that needs to be initialized so we can know when | |
656 | * to delete the channel (see consumer.c). | |
657 | * | |
658 | * As for the user space tracer now, the consumer creates and sends the | |
659 | * stream to the session daemon which only sends them to the application | |
660 | * once every stream of a channel is received making this value useless | |
661 | * because we they will be added to the poll thread before the application | |
662 | * receives them. This ensures that a stream can not hang up during | |
663 | * initilization of a channel. | |
664 | */ | |
665 | channel->nb_init_stream_left = 0; | |
666 | ||
667 | /* The reply msg status is handled in the following call. */ | |
4628484a | 668 | ret = create_ust_channel(channel, attr, &channel->uchan); |
ffe60014 | 669 | if (ret < 0) { |
10a50311 | 670 | goto end; |
3bd1e081 MD |
671 | } |
672 | ||
d8ef542d MD |
673 | channel->wait_fd = ustctl_channel_get_wait_fd(channel->uchan); |
674 | ||
10a50311 JD |
675 | /* |
676 | * For the snapshots (no monitor), we create the metadata streams | |
677 | * on demand, not during the channel creation. | |
678 | */ | |
679 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && !channel->monitor) { | |
680 | ret = 0; | |
681 | goto end; | |
682 | } | |
683 | ||
ffe60014 DG |
684 | /* Open all streams for this channel. */ |
685 | ret = create_ust_streams(channel, ctx); | |
686 | if (ret < 0) { | |
10a50311 | 687 | goto end; |
ffe60014 DG |
688 | } |
689 | ||
10a50311 | 690 | end: |
3bd1e081 MD |
691 | return ret; |
692 | } | |
693 | ||
d88aee68 DG |
694 | /* |
695 | * Send all stream of a channel to the right thread handling it. | |
696 | * | |
697 | * On error, return a negative value else 0 on success. | |
698 | */ | |
699 | static int send_streams_to_thread(struct lttng_consumer_channel *channel, | |
700 | struct lttng_consumer_local_data *ctx) | |
701 | { | |
702 | int ret = 0; | |
703 | struct lttng_consumer_stream *stream, *stmp; | |
704 | ||
705 | assert(channel); | |
706 | assert(ctx); | |
707 | ||
708 | /* Send streams to the corresponding thread. */ | |
709 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
710 | send_node) { | |
9ce5646a MD |
711 | |
712 | health_code_update(); | |
713 | ||
d88aee68 DG |
714 | /* Sending the stream to the thread. */ |
715 | ret = send_stream_to_thread(stream, ctx); | |
716 | if (ret < 0) { | |
717 | /* | |
718 | * If we are unable to send the stream to the thread, there is | |
719 | * a big problem so just stop everything. | |
720 | */ | |
5ab66908 MD |
721 | /* Remove node from the channel stream list. */ |
722 | cds_list_del(&stream->send_node); | |
d88aee68 DG |
723 | goto error; |
724 | } | |
725 | ||
726 | /* Remove node from the channel stream list. */ | |
727 | cds_list_del(&stream->send_node); | |
4891ece8 | 728 | |
d88aee68 DG |
729 | } |
730 | ||
731 | error: | |
732 | return ret; | |
733 | } | |
734 | ||
7972aab2 DG |
735 | /* |
736 | * Flush channel's streams using the given key to retrieve the channel. | |
737 | * | |
738 | * Return 0 on success else an LTTng error code. | |
739 | */ | |
740 | static int flush_channel(uint64_t chan_key) | |
741 | { | |
742 | int ret = 0; | |
743 | struct lttng_consumer_channel *channel; | |
744 | struct lttng_consumer_stream *stream; | |
745 | struct lttng_ht *ht; | |
746 | struct lttng_ht_iter iter; | |
747 | ||
8fd623e0 | 748 | DBG("UST consumer flush channel key %" PRIu64, chan_key); |
7972aab2 | 749 | |
a500c257 | 750 | rcu_read_lock(); |
7972aab2 DG |
751 | channel = consumer_find_channel(chan_key); |
752 | if (!channel) { | |
8fd623e0 | 753 | ERR("UST consumer flush channel %" PRIu64 " not found", chan_key); |
7972aab2 DG |
754 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
755 | goto error; | |
756 | } | |
757 | ||
758 | ht = consumer_data.stream_per_chan_id_ht; | |
759 | ||
760 | /* For each stream of the channel id, flush it. */ | |
7972aab2 DG |
761 | cds_lfht_for_each_entry_duplicate(ht->ht, |
762 | ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct, | |
763 | &channel->key, &iter.iter, stream, node_channel_id.node) { | |
9ce5646a MD |
764 | |
765 | health_code_update(); | |
766 | ||
b8086166 | 767 | ustctl_flush_buffer(stream->ustream, 1); |
7972aab2 | 768 | } |
7972aab2 | 769 | error: |
a500c257 | 770 | rcu_read_unlock(); |
7972aab2 DG |
771 | return ret; |
772 | } | |
773 | ||
d88aee68 DG |
774 | /* |
775 | * Close metadata stream wakeup_fd using the given key to retrieve the channel. | |
a500c257 | 776 | * RCU read side lock MUST be acquired before calling this function. |
d88aee68 DG |
777 | * |
778 | * Return 0 on success else an LTTng error code. | |
779 | */ | |
780 | static int close_metadata(uint64_t chan_key) | |
781 | { | |
ea88ca2a | 782 | int ret = 0; |
d88aee68 DG |
783 | struct lttng_consumer_channel *channel; |
784 | ||
8fd623e0 | 785 | DBG("UST consumer close metadata key %" PRIu64, chan_key); |
d88aee68 DG |
786 | |
787 | channel = consumer_find_channel(chan_key); | |
788 | if (!channel) { | |
84cc9aa0 DG |
789 | /* |
790 | * This is possible if the metadata thread has issue a delete because | |
791 | * the endpoint point of the stream hung up. There is no way the | |
792 | * session daemon can know about it thus use a DBG instead of an actual | |
793 | * error. | |
794 | */ | |
795 | DBG("UST consumer close metadata %" PRIu64 " not found", chan_key); | |
d88aee68 DG |
796 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
797 | goto error; | |
798 | } | |
799 | ||
ea88ca2a | 800 | pthread_mutex_lock(&consumer_data.lock); |
a9838785 | 801 | pthread_mutex_lock(&channel->lock); |
73811ecc DG |
802 | |
803 | if (cds_lfht_is_node_deleted(&channel->node.node)) { | |
804 | goto error_unlock; | |
805 | } | |
806 | ||
6d574024 | 807 | lttng_ustconsumer_close_metadata(channel); |
d88aee68 | 808 | |
ea88ca2a | 809 | error_unlock: |
a9838785 | 810 | pthread_mutex_unlock(&channel->lock); |
ea88ca2a | 811 | pthread_mutex_unlock(&consumer_data.lock); |
d88aee68 DG |
812 | error: |
813 | return ret; | |
814 | } | |
815 | ||
816 | /* | |
817 | * RCU read side lock MUST be acquired before calling this function. | |
818 | * | |
819 | * Return 0 on success else an LTTng error code. | |
820 | */ | |
821 | static int setup_metadata(struct lttng_consumer_local_data *ctx, uint64_t key) | |
822 | { | |
823 | int ret; | |
824 | struct lttng_consumer_channel *metadata; | |
825 | ||
8fd623e0 | 826 | DBG("UST consumer setup metadata key %" PRIu64, key); |
d88aee68 DG |
827 | |
828 | metadata = consumer_find_channel(key); | |
829 | if (!metadata) { | |
830 | ERR("UST consumer push metadata %" PRIu64 " not found", key); | |
831 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
10a50311 JD |
832 | goto end; |
833 | } | |
834 | ||
835 | /* | |
836 | * In no monitor mode, the metadata channel has no stream(s) so skip the | |
837 | * ownership transfer to the metadata thread. | |
838 | */ | |
839 | if (!metadata->monitor) { | |
840 | DBG("Metadata channel in no monitor"); | |
841 | ret = 0; | |
842 | goto end; | |
d88aee68 DG |
843 | } |
844 | ||
845 | /* | |
846 | * Send metadata stream to relayd if one available. Availability is | |
847 | * known if the stream is still in the list of the channel. | |
848 | */ | |
849 | if (cds_list_empty(&metadata->streams.head)) { | |
850 | ERR("Metadata channel key %" PRIu64 ", no stream available.", key); | |
851 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
f5a0c9cf | 852 | goto error_no_stream; |
d88aee68 DG |
853 | } |
854 | ||
855 | /* Send metadata stream to relayd if needed. */ | |
62285ea4 DG |
856 | if (metadata->metadata_stream->net_seq_idx != (uint64_t) -1ULL) { |
857 | ret = consumer_send_relayd_stream(metadata->metadata_stream, | |
858 | metadata->pathname); | |
859 | if (ret < 0) { | |
860 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
861 | goto error; | |
862 | } | |
601262d6 JD |
863 | ret = consumer_send_relayd_streams_sent( |
864 | metadata->metadata_stream->net_seq_idx); | |
865 | if (ret < 0) { | |
866 | ret = LTTCOMM_CONSUMERD_RELAYD_FAIL; | |
867 | goto error; | |
868 | } | |
d88aee68 DG |
869 | } |
870 | ||
871 | ret = send_streams_to_thread(metadata, ctx); | |
872 | if (ret < 0) { | |
873 | /* | |
874 | * If we are unable to send the stream to the thread, there is | |
875 | * a big problem so just stop everything. | |
876 | */ | |
877 | ret = LTTCOMM_CONSUMERD_FATAL; | |
878 | goto error; | |
879 | } | |
880 | /* List MUST be empty after or else it could be reused. */ | |
881 | assert(cds_list_empty(&metadata->streams.head)); | |
882 | ||
10a50311 JD |
883 | ret = 0; |
884 | goto end; | |
d88aee68 DG |
885 | |
886 | error: | |
f2a444f1 DG |
887 | /* |
888 | * Delete metadata channel on error. At this point, the metadata stream can | |
889 | * NOT be monitored by the metadata thread thus having the guarantee that | |
890 | * the stream is still in the local stream list of the channel. This call | |
891 | * will make sure to clean that list. | |
892 | */ | |
f5a0c9cf | 893 | consumer_stream_destroy(metadata->metadata_stream, NULL); |
212d67a2 DG |
894 | cds_list_del(&metadata->metadata_stream->send_node); |
895 | metadata->metadata_stream = NULL; | |
f5a0c9cf | 896 | error_no_stream: |
10a50311 JD |
897 | end: |
898 | return ret; | |
899 | } | |
900 | ||
901 | /* | |
902 | * Snapshot the whole metadata. | |
903 | * | |
904 | * Returns 0 on success, < 0 on error | |
905 | */ | |
906 | static int snapshot_metadata(uint64_t key, char *path, uint64_t relayd_id, | |
907 | struct lttng_consumer_local_data *ctx) | |
908 | { | |
909 | int ret = 0; | |
10a50311 JD |
910 | struct lttng_consumer_channel *metadata_channel; |
911 | struct lttng_consumer_stream *metadata_stream; | |
912 | ||
913 | assert(path); | |
914 | assert(ctx); | |
915 | ||
916 | DBG("UST consumer snapshot metadata with key %" PRIu64 " at path %s", | |
917 | key, path); | |
918 | ||
919 | rcu_read_lock(); | |
920 | ||
921 | metadata_channel = consumer_find_channel(key); | |
922 | if (!metadata_channel) { | |
6a00837f MD |
923 | ERR("UST snapshot metadata channel not found for key %" PRIu64, |
924 | key); | |
10a50311 JD |
925 | ret = -1; |
926 | goto error; | |
927 | } | |
928 | assert(!metadata_channel->monitor); | |
929 | ||
9ce5646a MD |
930 | health_code_update(); |
931 | ||
10a50311 JD |
932 | /* |
933 | * Ask the sessiond if we have new metadata waiting and update the | |
934 | * consumer metadata cache. | |
935 | */ | |
94d49140 | 936 | ret = lttng_ustconsumer_request_metadata(ctx, metadata_channel, 0, 1); |
10a50311 JD |
937 | if (ret < 0) { |
938 | goto error; | |
939 | } | |
940 | ||
9ce5646a MD |
941 | health_code_update(); |
942 | ||
10a50311 JD |
943 | /* |
944 | * The metadata stream is NOT created in no monitor mode when the channel | |
945 | * is created on a sessiond ask channel command. | |
946 | */ | |
947 | ret = create_ust_streams(metadata_channel, ctx); | |
948 | if (ret < 0) { | |
949 | goto error; | |
950 | } | |
951 | ||
952 | metadata_stream = metadata_channel->metadata_stream; | |
953 | assert(metadata_stream); | |
954 | ||
955 | if (relayd_id != (uint64_t) -1ULL) { | |
956 | metadata_stream->net_seq_idx = relayd_id; | |
957 | ret = consumer_send_relayd_stream(metadata_stream, path); | |
958 | if (ret < 0) { | |
959 | goto error_stream; | |
960 | } | |
961 | } else { | |
962 | ret = utils_create_stream_file(path, metadata_stream->name, | |
963 | metadata_stream->chan->tracefile_size, | |
964 | metadata_stream->tracefile_count_current, | |
309167d2 | 965 | metadata_stream->uid, metadata_stream->gid, NULL); |
10a50311 JD |
966 | if (ret < 0) { |
967 | goto error_stream; | |
968 | } | |
969 | metadata_stream->out_fd = ret; | |
970 | metadata_stream->tracefile_size_current = 0; | |
971 | } | |
972 | ||
04ef1097 | 973 | do { |
9ce5646a MD |
974 | health_code_update(); |
975 | ||
10a50311 JD |
976 | ret = lttng_consumer_read_subbuffer(metadata_stream, ctx); |
977 | if (ret < 0) { | |
94d49140 | 978 | goto error_stream; |
10a50311 | 979 | } |
04ef1097 | 980 | } while (ret > 0); |
10a50311 | 981 | |
10a50311 JD |
982 | error_stream: |
983 | /* | |
984 | * Clean up the stream completly because the next snapshot will use a new | |
985 | * metadata stream. | |
986 | */ | |
10a50311 | 987 | consumer_stream_destroy(metadata_stream, NULL); |
212d67a2 | 988 | cds_list_del(&metadata_stream->send_node); |
10a50311 JD |
989 | metadata_channel->metadata_stream = NULL; |
990 | ||
991 | error: | |
992 | rcu_read_unlock(); | |
993 | return ret; | |
994 | } | |
995 | ||
996 | /* | |
997 | * Take a snapshot of all the stream of a channel. | |
998 | * | |
999 | * Returns 0 on success, < 0 on error | |
1000 | */ | |
1001 | static int snapshot_channel(uint64_t key, char *path, uint64_t relayd_id, | |
d07ceecd | 1002 | uint64_t nb_packets_per_stream, struct lttng_consumer_local_data *ctx) |
10a50311 JD |
1003 | { |
1004 | int ret; | |
1005 | unsigned use_relayd = 0; | |
1006 | unsigned long consumed_pos, produced_pos; | |
1007 | struct lttng_consumer_channel *channel; | |
1008 | struct lttng_consumer_stream *stream; | |
1009 | ||
1010 | assert(path); | |
1011 | assert(ctx); | |
1012 | ||
1013 | rcu_read_lock(); | |
1014 | ||
1015 | if (relayd_id != (uint64_t) -1ULL) { | |
1016 | use_relayd = 1; | |
1017 | } | |
1018 | ||
1019 | channel = consumer_find_channel(key); | |
1020 | if (!channel) { | |
6a00837f | 1021 | ERR("UST snapshot channel not found for key %" PRIu64, key); |
10a50311 JD |
1022 | ret = -1; |
1023 | goto error; | |
1024 | } | |
1025 | assert(!channel->monitor); | |
6a00837f | 1026 | DBG("UST consumer snapshot channel %" PRIu64, key); |
10a50311 JD |
1027 | |
1028 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
1029 | |
1030 | health_code_update(); | |
1031 | ||
10a50311 JD |
1032 | /* Lock stream because we are about to change its state. */ |
1033 | pthread_mutex_lock(&stream->lock); | |
1034 | stream->net_seq_idx = relayd_id; | |
1035 | ||
1036 | if (use_relayd) { | |
1037 | ret = consumer_send_relayd_stream(stream, path); | |
1038 | if (ret < 0) { | |
1039 | goto error_unlock; | |
1040 | } | |
1041 | } else { | |
1042 | ret = utils_create_stream_file(path, stream->name, | |
1043 | stream->chan->tracefile_size, | |
1044 | stream->tracefile_count_current, | |
309167d2 | 1045 | stream->uid, stream->gid, NULL); |
10a50311 JD |
1046 | if (ret < 0) { |
1047 | goto error_unlock; | |
1048 | } | |
1049 | stream->out_fd = ret; | |
1050 | stream->tracefile_size_current = 0; | |
1051 | ||
1052 | DBG("UST consumer snapshot stream %s/%s (%" PRIu64 ")", path, | |
1053 | stream->name, stream->key); | |
1054 | } | |
a4baae1b JD |
1055 | if (relayd_id != -1ULL) { |
1056 | ret = consumer_send_relayd_streams_sent(relayd_id); | |
1057 | if (ret < 0) { | |
1058 | goto error_unlock; | |
1059 | } | |
1060 | } | |
10a50311 JD |
1061 | |
1062 | ustctl_flush_buffer(stream->ustream, 1); | |
1063 | ||
1064 | ret = lttng_ustconsumer_take_snapshot(stream); | |
1065 | if (ret < 0) { | |
1066 | ERR("Taking UST snapshot"); | |
1067 | goto error_unlock; | |
1068 | } | |
1069 | ||
1070 | ret = lttng_ustconsumer_get_produced_snapshot(stream, &produced_pos); | |
1071 | if (ret < 0) { | |
1072 | ERR("Produced UST snapshot position"); | |
1073 | goto error_unlock; | |
1074 | } | |
1075 | ||
1076 | ret = lttng_ustconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
1077 | if (ret < 0) { | |
1078 | ERR("Consumerd UST snapshot position"); | |
1079 | goto error_unlock; | |
1080 | } | |
1081 | ||
5c786ded JD |
1082 | /* |
1083 | * The original value is sent back if max stream size is larger than | |
d07ceecd | 1084 | * the possible size of the snapshot. Also, we assume that the session |
5c786ded JD |
1085 | * daemon should never send a maximum stream size that is lower than |
1086 | * subbuffer size. | |
1087 | */ | |
d07ceecd MD |
1088 | consumed_pos = consumer_get_consume_start_pos(consumed_pos, |
1089 | produced_pos, nb_packets_per_stream, | |
1090 | stream->max_sb_size); | |
5c786ded | 1091 | |
10a50311 JD |
1092 | while (consumed_pos < produced_pos) { |
1093 | ssize_t read_len; | |
1094 | unsigned long len, padded_len; | |
1095 | ||
9ce5646a MD |
1096 | health_code_update(); |
1097 | ||
10a50311 JD |
1098 | DBG("UST consumer taking snapshot at pos %lu", consumed_pos); |
1099 | ||
1100 | ret = ustctl_get_subbuf(stream->ustream, &consumed_pos); | |
1101 | if (ret < 0) { | |
1102 | if (ret != -EAGAIN) { | |
1103 | PERROR("ustctl_get_subbuf snapshot"); | |
1104 | goto error_close_stream; | |
1105 | } | |
1106 | DBG("UST consumer get subbuf failed. Skipping it."); | |
1107 | consumed_pos += stream->max_sb_size; | |
1108 | continue; | |
1109 | } | |
1110 | ||
1111 | ret = ustctl_get_subbuf_size(stream->ustream, &len); | |
1112 | if (ret < 0) { | |
1113 | ERR("Snapshot ustctl_get_subbuf_size"); | |
1114 | goto error_put_subbuf; | |
1115 | } | |
1116 | ||
1117 | ret = ustctl_get_padded_subbuf_size(stream->ustream, &padded_len); | |
1118 | if (ret < 0) { | |
1119 | ERR("Snapshot ustctl_get_padded_subbuf_size"); | |
1120 | goto error_put_subbuf; | |
1121 | } | |
1122 | ||
1123 | read_len = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, len, | |
309167d2 | 1124 | padded_len - len, NULL); |
10a50311 JD |
1125 | if (use_relayd) { |
1126 | if (read_len != len) { | |
56591bac | 1127 | ret = -EPERM; |
10a50311 JD |
1128 | goto error_put_subbuf; |
1129 | } | |
1130 | } else { | |
1131 | if (read_len != padded_len) { | |
56591bac | 1132 | ret = -EPERM; |
10a50311 JD |
1133 | goto error_put_subbuf; |
1134 | } | |
1135 | } | |
1136 | ||
1137 | ret = ustctl_put_subbuf(stream->ustream); | |
1138 | if (ret < 0) { | |
1139 | ERR("Snapshot ustctl_put_subbuf"); | |
1140 | goto error_close_stream; | |
1141 | } | |
1142 | consumed_pos += stream->max_sb_size; | |
1143 | } | |
1144 | ||
1145 | /* Simply close the stream so we can use it on the next snapshot. */ | |
1146 | consumer_stream_close(stream); | |
1147 | pthread_mutex_unlock(&stream->lock); | |
1148 | } | |
1149 | ||
1150 | rcu_read_unlock(); | |
1151 | return 0; | |
1152 | ||
1153 | error_put_subbuf: | |
1154 | if (ustctl_put_subbuf(stream->ustream) < 0) { | |
1155 | ERR("Snapshot ustctl_put_subbuf"); | |
1156 | } | |
1157 | error_close_stream: | |
1158 | consumer_stream_close(stream); | |
1159 | error_unlock: | |
1160 | pthread_mutex_unlock(&stream->lock); | |
1161 | error: | |
1162 | rcu_read_unlock(); | |
d88aee68 DG |
1163 | return ret; |
1164 | } | |
1165 | ||
331744e3 JD |
1166 | /* |
1167 | * Receive the metadata updates from the sessiond. | |
1168 | */ | |
1169 | int lttng_ustconsumer_recv_metadata(int sock, uint64_t key, uint64_t offset, | |
5e41ebe1 | 1170 | uint64_t len, struct lttng_consumer_channel *channel, |
94d49140 | 1171 | int timer, int wait) |
331744e3 | 1172 | { |
0c759fc9 | 1173 | int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
331744e3 JD |
1174 | char *metadata_str; |
1175 | ||
8fd623e0 | 1176 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, len); |
331744e3 JD |
1177 | |
1178 | metadata_str = zmalloc(len * sizeof(char)); | |
1179 | if (!metadata_str) { | |
1180 | PERROR("zmalloc metadata string"); | |
1181 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; | |
1182 | goto end; | |
1183 | } | |
1184 | ||
9ce5646a MD |
1185 | health_code_update(); |
1186 | ||
331744e3 JD |
1187 | /* Receive metadata string. */ |
1188 | ret = lttcomm_recv_unix_sock(sock, metadata_str, len); | |
1189 | if (ret < 0) { | |
1190 | /* Session daemon is dead so return gracefully. */ | |
1191 | ret_code = ret; | |
1192 | goto end_free; | |
1193 | } | |
1194 | ||
9ce5646a MD |
1195 | health_code_update(); |
1196 | ||
331744e3 JD |
1197 | pthread_mutex_lock(&channel->metadata_cache->lock); |
1198 | ret = consumer_metadata_cache_write(channel, offset, len, metadata_str); | |
1199 | if (ret < 0) { | |
1200 | /* Unable to handle metadata. Notify session daemon. */ | |
1201 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
a32bd775 DG |
1202 | /* |
1203 | * Skip metadata flush on write error since the offset and len might | |
1204 | * not have been updated which could create an infinite loop below when | |
1205 | * waiting for the metadata cache to be flushed. | |
1206 | */ | |
1207 | pthread_mutex_unlock(&channel->metadata_cache->lock); | |
a32bd775 | 1208 | goto end_free; |
331744e3 JD |
1209 | } |
1210 | pthread_mutex_unlock(&channel->metadata_cache->lock); | |
1211 | ||
94d49140 JD |
1212 | if (!wait) { |
1213 | goto end_free; | |
1214 | } | |
5e41ebe1 | 1215 | while (consumer_metadata_cache_flushed(channel, offset + len, timer)) { |
331744e3 | 1216 | DBG("Waiting for metadata to be flushed"); |
9ce5646a MD |
1217 | |
1218 | health_code_update(); | |
1219 | ||
331744e3 JD |
1220 | usleep(DEFAULT_METADATA_AVAILABILITY_WAIT_TIME); |
1221 | } | |
1222 | ||
1223 | end_free: | |
1224 | free(metadata_str); | |
1225 | end: | |
1226 | return ret_code; | |
1227 | } | |
1228 | ||
4cbc1a04 DG |
1229 | /* |
1230 | * Receive command from session daemon and process it. | |
1231 | * | |
1232 | * Return 1 on success else a negative value or 0. | |
1233 | */ | |
3bd1e081 MD |
1234 | int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
1235 | int sock, struct pollfd *consumer_sockpoll) | |
1236 | { | |
1237 | ssize_t ret; | |
0c759fc9 | 1238 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
3bd1e081 | 1239 | struct lttcomm_consumer_msg msg; |
ffe60014 | 1240 | struct lttng_consumer_channel *channel = NULL; |
3bd1e081 | 1241 | |
9ce5646a MD |
1242 | health_code_update(); |
1243 | ||
3bd1e081 MD |
1244 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); |
1245 | if (ret != sizeof(msg)) { | |
173af62f DG |
1246 | DBG("Consumer received unexpected message size %zd (expects %zu)", |
1247 | ret, sizeof(msg)); | |
3be74084 DG |
1248 | /* |
1249 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
1250 | * since the caller handles this. | |
1251 | */ | |
489f70e9 | 1252 | if (ret > 0) { |
c6857fcf | 1253 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
489f70e9 MD |
1254 | ret = -1; |
1255 | } | |
3bd1e081 MD |
1256 | return ret; |
1257 | } | |
9ce5646a MD |
1258 | |
1259 | health_code_update(); | |
1260 | ||
84382d49 MD |
1261 | /* deprecated */ |
1262 | assert(msg.cmd_type != LTTNG_CONSUMER_STOP); | |
3bd1e081 | 1263 | |
9ce5646a MD |
1264 | health_code_update(); |
1265 | ||
3f8e211f | 1266 | /* relayd needs RCU read-side lock */ |
b0b335c8 MD |
1267 | rcu_read_lock(); |
1268 | ||
3bd1e081 | 1269 | switch (msg.cmd_type) { |
00e2e675 DG |
1270 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
1271 | { | |
f50f23d9 | 1272 | /* Session daemon status message are handled in the following call. */ |
7735ef9e DG |
1273 | ret = consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
1274 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, | |
d3e2ba59 JD |
1275 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id, |
1276 | msg.u.relayd_sock.relayd_session_id); | |
00e2e675 DG |
1277 | goto end_nosignal; |
1278 | } | |
173af62f DG |
1279 | case LTTNG_CONSUMER_DESTROY_RELAYD: |
1280 | { | |
a6ba4fe1 | 1281 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
173af62f DG |
1282 | struct consumer_relayd_sock_pair *relayd; |
1283 | ||
a6ba4fe1 | 1284 | DBG("UST consumer destroying relayd %" PRIu64, index); |
173af62f DG |
1285 | |
1286 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 1287 | relayd = consumer_find_relayd(index); |
173af62f | 1288 | if (relayd == NULL) { |
3448e266 | 1289 | DBG("Unable to find relayd %" PRIu64, index); |
e462382a | 1290 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
173af62f DG |
1291 | } |
1292 | ||
a6ba4fe1 DG |
1293 | /* |
1294 | * Each relayd socket pair has a refcount of stream attached to it | |
1295 | * which tells if the relayd is still active or not depending on the | |
1296 | * refcount value. | |
1297 | * | |
1298 | * This will set the destroy flag of the relayd object and destroy it | |
1299 | * if the refcount reaches zero when called. | |
1300 | * | |
1301 | * The destroy can happen either here or when a stream fd hangs up. | |
1302 | */ | |
f50f23d9 DG |
1303 | if (relayd) { |
1304 | consumer_flag_relayd_for_destroy(relayd); | |
1305 | } | |
1306 | ||
d88aee68 | 1307 | goto end_msg_sessiond; |
173af62f | 1308 | } |
3bd1e081 MD |
1309 | case LTTNG_CONSUMER_UPDATE_STREAM: |
1310 | { | |
3f8e211f | 1311 | rcu_read_unlock(); |
7ad0a0cb | 1312 | return -ENOSYS; |
3bd1e081 | 1313 | } |
6d805429 | 1314 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 1315 | { |
3be74084 | 1316 | int ret, is_data_pending; |
6d805429 | 1317 | uint64_t id = msg.u.data_pending.session_id; |
ca22feea | 1318 | |
6d805429 | 1319 | DBG("UST consumer data pending command for id %" PRIu64, id); |
ca22feea | 1320 | |
3be74084 | 1321 | is_data_pending = consumer_data_pending(id); |
ca22feea DG |
1322 | |
1323 | /* Send back returned value to session daemon */ | |
3be74084 DG |
1324 | ret = lttcomm_send_unix_sock(sock, &is_data_pending, |
1325 | sizeof(is_data_pending)); | |
ca22feea | 1326 | if (ret < 0) { |
3be74084 | 1327 | DBG("Error when sending the data pending ret code: %d", ret); |
489f70e9 | 1328 | goto error_fatal; |
ca22feea | 1329 | } |
f50f23d9 DG |
1330 | |
1331 | /* | |
1332 | * No need to send back a status message since the data pending | |
1333 | * returned value is the response. | |
1334 | */ | |
ca22feea | 1335 | break; |
53632229 | 1336 | } |
ffe60014 DG |
1337 | case LTTNG_CONSUMER_ASK_CHANNEL_CREATION: |
1338 | { | |
1339 | int ret; | |
1340 | struct ustctl_consumer_channel_attr attr; | |
1341 | ||
1342 | /* Create a plain object and reserve a channel key. */ | |
1343 | channel = allocate_channel(msg.u.ask_channel.session_id, | |
1344 | msg.u.ask_channel.pathname, msg.u.ask_channel.name, | |
1345 | msg.u.ask_channel.uid, msg.u.ask_channel.gid, | |
1346 | msg.u.ask_channel.relayd_id, msg.u.ask_channel.key, | |
1624d5b7 JD |
1347 | (enum lttng_event_output) msg.u.ask_channel.output, |
1348 | msg.u.ask_channel.tracefile_size, | |
2bba9e53 | 1349 | msg.u.ask_channel.tracefile_count, |
1950109e | 1350 | msg.u.ask_channel.session_id_per_pid, |
ecc48a90 | 1351 | msg.u.ask_channel.monitor, |
d7ba1388 | 1352 | msg.u.ask_channel.live_timer_interval, |
3d071855 | 1353 | msg.u.ask_channel.root_shm_path, |
d7ba1388 | 1354 | msg.u.ask_channel.shm_path); |
ffe60014 DG |
1355 | if (!channel) { |
1356 | goto end_channel_error; | |
1357 | } | |
1358 | ||
567eb353 DG |
1359 | /* |
1360 | * Assign UST application UID to the channel. This value is ignored for | |
1361 | * per PID buffers. This is specific to UST thus setting this after the | |
1362 | * allocation. | |
1363 | */ | |
1364 | channel->ust_app_uid = msg.u.ask_channel.ust_app_uid; | |
1365 | ||
ffe60014 DG |
1366 | /* Build channel attributes from received message. */ |
1367 | attr.subbuf_size = msg.u.ask_channel.subbuf_size; | |
1368 | attr.num_subbuf = msg.u.ask_channel.num_subbuf; | |
1369 | attr.overwrite = msg.u.ask_channel.overwrite; | |
1370 | attr.switch_timer_interval = msg.u.ask_channel.switch_timer_interval; | |
1371 | attr.read_timer_interval = msg.u.ask_channel.read_timer_interval; | |
7972aab2 | 1372 | attr.chan_id = msg.u.ask_channel.chan_id; |
ffe60014 DG |
1373 | memcpy(attr.uuid, msg.u.ask_channel.uuid, sizeof(attr.uuid)); |
1374 | ||
0c759fc9 DG |
1375 | /* Match channel buffer type to the UST abi. */ |
1376 | switch (msg.u.ask_channel.output) { | |
1377 | case LTTNG_EVENT_MMAP: | |
1378 | default: | |
1379 | attr.output = LTTNG_UST_MMAP; | |
1380 | break; | |
1381 | } | |
1382 | ||
ffe60014 DG |
1383 | /* Translate and save channel type. */ |
1384 | switch (msg.u.ask_channel.type) { | |
1385 | case LTTNG_UST_CHAN_PER_CPU: | |
1386 | channel->type = CONSUMER_CHANNEL_TYPE_DATA; | |
1387 | attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8633d6e3 MD |
1388 | /* |
1389 | * Set refcount to 1 for owner. Below, we will | |
1390 | * pass ownership to the | |
1391 | * consumer_thread_channel_poll() thread. | |
1392 | */ | |
1393 | channel->refcount = 1; | |
ffe60014 DG |
1394 | break; |
1395 | case LTTNG_UST_CHAN_METADATA: | |
1396 | channel->type = CONSUMER_CHANNEL_TYPE_METADATA; | |
1397 | attr.type = LTTNG_UST_CHAN_METADATA; | |
1398 | break; | |
1399 | default: | |
1400 | assert(0); | |
1401 | goto error_fatal; | |
1402 | }; | |
1403 | ||
9ce5646a MD |
1404 | health_code_update(); |
1405 | ||
ffe60014 DG |
1406 | ret = ask_channel(ctx, sock, channel, &attr); |
1407 | if (ret < 0) { | |
1408 | goto end_channel_error; | |
1409 | } | |
1410 | ||
fc643247 MD |
1411 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
1412 | ret = consumer_metadata_cache_allocate(channel); | |
1413 | if (ret < 0) { | |
1414 | ERR("Allocating metadata cache"); | |
1415 | goto end_channel_error; | |
1416 | } | |
1417 | consumer_timer_switch_start(channel, attr.switch_timer_interval); | |
1418 | attr.switch_timer_interval = 0; | |
94d49140 JD |
1419 | } else { |
1420 | consumer_timer_live_start(channel, | |
1421 | msg.u.ask_channel.live_timer_interval); | |
fc643247 MD |
1422 | } |
1423 | ||
9ce5646a MD |
1424 | health_code_update(); |
1425 | ||
ffe60014 DG |
1426 | /* |
1427 | * Add the channel to the internal state AFTER all streams were created | |
1428 | * and successfully sent to session daemon. This way, all streams must | |
1429 | * be ready before this channel is visible to the threads. | |
fc643247 MD |
1430 | * If add_channel succeeds, ownership of the channel is |
1431 | * passed to consumer_thread_channel_poll(). | |
ffe60014 DG |
1432 | */ |
1433 | ret = add_channel(channel, ctx); | |
1434 | if (ret < 0) { | |
ea88ca2a MD |
1435 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
1436 | if (channel->switch_timer_enabled == 1) { | |
1437 | consumer_timer_switch_stop(channel); | |
1438 | } | |
1439 | consumer_metadata_cache_destroy(channel); | |
1440 | } | |
d3e2ba59 JD |
1441 | if (channel->live_timer_enabled == 1) { |
1442 | consumer_timer_live_stop(channel); | |
1443 | } | |
ffe60014 DG |
1444 | goto end_channel_error; |
1445 | } | |
1446 | ||
9ce5646a MD |
1447 | health_code_update(); |
1448 | ||
ffe60014 DG |
1449 | /* |
1450 | * Channel and streams are now created. Inform the session daemon that | |
1451 | * everything went well and should wait to receive the channel and | |
1452 | * streams with ustctl API. | |
1453 | */ | |
1454 | ret = consumer_send_status_channel(sock, channel); | |
1455 | if (ret < 0) { | |
1456 | /* | |
489f70e9 | 1457 | * There is probably a problem on the socket. |
ffe60014 | 1458 | */ |
489f70e9 | 1459 | goto error_fatal; |
ffe60014 DG |
1460 | } |
1461 | ||
1462 | break; | |
1463 | } | |
1464 | case LTTNG_CONSUMER_GET_CHANNEL: | |
1465 | { | |
1466 | int ret, relayd_err = 0; | |
d88aee68 | 1467 | uint64_t key = msg.u.get_channel.key; |
ffe60014 | 1468 | struct lttng_consumer_channel *channel; |
ffe60014 DG |
1469 | |
1470 | channel = consumer_find_channel(key); | |
1471 | if (!channel) { | |
8fd623e0 | 1472 | ERR("UST consumer get channel key %" PRIu64 " not found", key); |
e462382a | 1473 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
ffe60014 DG |
1474 | goto end_msg_sessiond; |
1475 | } | |
1476 | ||
9ce5646a MD |
1477 | health_code_update(); |
1478 | ||
ffe60014 DG |
1479 | /* Send everything to sessiond. */ |
1480 | ret = send_sessiond_channel(sock, channel, ctx, &relayd_err); | |
1481 | if (ret < 0) { | |
1482 | if (relayd_err) { | |
1483 | /* | |
1484 | * We were unable to send to the relayd the stream so avoid | |
1485 | * sending back a fatal error to the thread since this is OK | |
f2a444f1 DG |
1486 | * and the consumer can continue its work. The above call |
1487 | * has sent the error status message to the sessiond. | |
ffe60014 | 1488 | */ |
f2a444f1 | 1489 | goto end_nosignal; |
ffe60014 DG |
1490 | } |
1491 | /* | |
1492 | * The communicaton was broken hence there is a bad state between | |
1493 | * the consumer and sessiond so stop everything. | |
1494 | */ | |
1495 | goto error_fatal; | |
1496 | } | |
1497 | ||
9ce5646a MD |
1498 | health_code_update(); |
1499 | ||
10a50311 JD |
1500 | /* |
1501 | * In no monitor mode, the streams ownership is kept inside the channel | |
1502 | * so don't send them to the data thread. | |
1503 | */ | |
1504 | if (!channel->monitor) { | |
1505 | goto end_msg_sessiond; | |
1506 | } | |
1507 | ||
d88aee68 DG |
1508 | ret = send_streams_to_thread(channel, ctx); |
1509 | if (ret < 0) { | |
1510 | /* | |
1511 | * If we are unable to send the stream to the thread, there is | |
1512 | * a big problem so just stop everything. | |
1513 | */ | |
1514 | goto error_fatal; | |
ffe60014 | 1515 | } |
ffe60014 DG |
1516 | /* List MUST be empty after or else it could be reused. */ |
1517 | assert(cds_list_empty(&channel->streams.head)); | |
d88aee68 DG |
1518 | goto end_msg_sessiond; |
1519 | } | |
1520 | case LTTNG_CONSUMER_DESTROY_CHANNEL: | |
1521 | { | |
1522 | uint64_t key = msg.u.destroy_channel.key; | |
d88aee68 | 1523 | |
a0cbdd2e MD |
1524 | /* |
1525 | * Only called if streams have not been sent to stream | |
1526 | * manager thread. However, channel has been sent to | |
1527 | * channel manager thread. | |
1528 | */ | |
1529 | notify_thread_del_channel(ctx, key); | |
d88aee68 | 1530 | goto end_msg_sessiond; |
ffe60014 | 1531 | } |
d88aee68 DG |
1532 | case LTTNG_CONSUMER_CLOSE_METADATA: |
1533 | { | |
1534 | int ret; | |
1535 | ||
1536 | ret = close_metadata(msg.u.close_metadata.key); | |
1537 | if (ret != 0) { | |
1538 | ret_code = ret; | |
1539 | } | |
1540 | ||
1541 | goto end_msg_sessiond; | |
1542 | } | |
7972aab2 DG |
1543 | case LTTNG_CONSUMER_FLUSH_CHANNEL: |
1544 | { | |
1545 | int ret; | |
1546 | ||
1547 | ret = flush_channel(msg.u.flush_channel.key); | |
1548 | if (ret != 0) { | |
1549 | ret_code = ret; | |
1550 | } | |
1551 | ||
1552 | goto end_msg_sessiond; | |
1553 | } | |
d88aee68 | 1554 | case LTTNG_CONSUMER_PUSH_METADATA: |
ffe60014 DG |
1555 | { |
1556 | int ret; | |
d88aee68 | 1557 | uint64_t len = msg.u.push_metadata.len; |
d88aee68 | 1558 | uint64_t key = msg.u.push_metadata.key; |
331744e3 | 1559 | uint64_t offset = msg.u.push_metadata.target_offset; |
ffe60014 DG |
1560 | struct lttng_consumer_channel *channel; |
1561 | ||
8fd623e0 DG |
1562 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, |
1563 | len); | |
ffe60014 DG |
1564 | |
1565 | channel = consumer_find_channel(key); | |
1566 | if (!channel) { | |
000baf6a DG |
1567 | /* |
1568 | * This is possible if the metadata creation on the consumer side | |
1569 | * is in flight vis-a-vis a concurrent push metadata from the | |
1570 | * session daemon. Simply return that the channel failed and the | |
1571 | * session daemon will handle that message correctly considering | |
1572 | * that this race is acceptable thus the DBG() statement here. | |
1573 | */ | |
1574 | DBG("UST consumer push metadata %" PRIu64 " not found", key); | |
1575 | ret_code = LTTCOMM_CONSUMERD_CHANNEL_FAIL; | |
4a2eb0ca | 1576 | goto end_msg_sessiond; |
d88aee68 DG |
1577 | } |
1578 | ||
9ce5646a MD |
1579 | health_code_update(); |
1580 | ||
d88aee68 | 1581 | /* Tell session daemon we are ready to receive the metadata. */ |
0c759fc9 | 1582 | ret = consumer_send_status_msg(sock, LTTCOMM_CONSUMERD_SUCCESS); |
ffe60014 DG |
1583 | if (ret < 0) { |
1584 | /* Somehow, the session daemon is not responding anymore. */ | |
d88aee68 DG |
1585 | goto error_fatal; |
1586 | } | |
1587 | ||
9ce5646a MD |
1588 | health_code_update(); |
1589 | ||
d88aee68 | 1590 | /* Wait for more data. */ |
9ce5646a MD |
1591 | health_poll_entry(); |
1592 | ret = lttng_consumer_poll_socket(consumer_sockpoll); | |
1593 | health_poll_exit(); | |
84382d49 | 1594 | if (ret) { |
489f70e9 | 1595 | goto error_fatal; |
d88aee68 DG |
1596 | } |
1597 | ||
9ce5646a MD |
1598 | health_code_update(); |
1599 | ||
331744e3 | 1600 | ret = lttng_ustconsumer_recv_metadata(sock, key, offset, |
94d49140 | 1601 | len, channel, 0, 1); |
d88aee68 | 1602 | if (ret < 0) { |
331744e3 | 1603 | /* error receiving from sessiond */ |
489f70e9 | 1604 | goto error_fatal; |
331744e3 JD |
1605 | } else { |
1606 | ret_code = ret; | |
d88aee68 DG |
1607 | goto end_msg_sessiond; |
1608 | } | |
d88aee68 DG |
1609 | } |
1610 | case LTTNG_CONSUMER_SETUP_METADATA: | |
1611 | { | |
1612 | int ret; | |
1613 | ||
1614 | ret = setup_metadata(ctx, msg.u.setup_metadata.key); | |
1615 | if (ret) { | |
1616 | ret_code = ret; | |
1617 | } | |
1618 | goto end_msg_sessiond; | |
ffe60014 | 1619 | } |
6dc3064a DG |
1620 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
1621 | { | |
10a50311 JD |
1622 | if (msg.u.snapshot_channel.metadata) { |
1623 | ret = snapshot_metadata(msg.u.snapshot_channel.key, | |
1624 | msg.u.snapshot_channel.pathname, | |
1625 | msg.u.snapshot_channel.relayd_id, | |
1626 | ctx); | |
1627 | if (ret < 0) { | |
1628 | ERR("Snapshot metadata failed"); | |
e462382a | 1629 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; |
10a50311 JD |
1630 | } |
1631 | } else { | |
1632 | ret = snapshot_channel(msg.u.snapshot_channel.key, | |
1633 | msg.u.snapshot_channel.pathname, | |
1634 | msg.u.snapshot_channel.relayd_id, | |
d07ceecd | 1635 | msg.u.snapshot_channel.nb_packets_per_stream, |
10a50311 JD |
1636 | ctx); |
1637 | if (ret < 0) { | |
1638 | ERR("Snapshot channel failed"); | |
e462382a | 1639 | ret_code = LTTCOMM_CONSUMERD_CHANNEL_FAIL; |
10a50311 JD |
1640 | } |
1641 | } | |
1642 | ||
9ce5646a | 1643 | health_code_update(); |
6dc3064a DG |
1644 | ret = consumer_send_status_msg(sock, ret_code); |
1645 | if (ret < 0) { | |
1646 | /* Somehow, the session daemon is not responding anymore. */ | |
1647 | goto end_nosignal; | |
1648 | } | |
9ce5646a | 1649 | health_code_update(); |
6dc3064a DG |
1650 | break; |
1651 | } | |
3bd1e081 MD |
1652 | default: |
1653 | break; | |
1654 | } | |
3f8e211f | 1655 | |
3bd1e081 | 1656 | end_nosignal: |
b0b335c8 | 1657 | rcu_read_unlock(); |
4cbc1a04 | 1658 | |
9ce5646a MD |
1659 | health_code_update(); |
1660 | ||
4cbc1a04 DG |
1661 | /* |
1662 | * Return 1 to indicate success since the 0 value can be a socket | |
1663 | * shutdown during the recv() or send() call. | |
1664 | */ | |
1665 | return 1; | |
ffe60014 DG |
1666 | |
1667 | end_msg_sessiond: | |
1668 | /* | |
1669 | * The returned value here is not useful since either way we'll return 1 to | |
1670 | * the caller because the session daemon socket management is done | |
1671 | * elsewhere. Returning a negative code or 0 will shutdown the consumer. | |
1672 | */ | |
489f70e9 MD |
1673 | ret = consumer_send_status_msg(sock, ret_code); |
1674 | if (ret < 0) { | |
1675 | goto error_fatal; | |
1676 | } | |
ffe60014 | 1677 | rcu_read_unlock(); |
9ce5646a MD |
1678 | |
1679 | health_code_update(); | |
1680 | ||
ffe60014 DG |
1681 | return 1; |
1682 | end_channel_error: | |
1683 | if (channel) { | |
1684 | /* | |
1685 | * Free channel here since no one has a reference to it. We don't | |
1686 | * free after that because a stream can store this pointer. | |
1687 | */ | |
1688 | destroy_channel(channel); | |
1689 | } | |
1690 | /* We have to send a status channel message indicating an error. */ | |
1691 | ret = consumer_send_status_channel(sock, NULL); | |
1692 | if (ret < 0) { | |
1693 | /* Stop everything if session daemon can not be notified. */ | |
1694 | goto error_fatal; | |
1695 | } | |
1696 | rcu_read_unlock(); | |
9ce5646a MD |
1697 | |
1698 | health_code_update(); | |
1699 | ||
ffe60014 DG |
1700 | return 1; |
1701 | error_fatal: | |
1702 | rcu_read_unlock(); | |
1703 | /* This will issue a consumer stop. */ | |
1704 | return -1; | |
3bd1e081 MD |
1705 | } |
1706 | ||
ffe60014 DG |
1707 | /* |
1708 | * Wrapper over the mmap() read offset from ust-ctl library. Since this can be | |
1709 | * compiled out, we isolate it in this library. | |
1710 | */ | |
1711 | int lttng_ustctl_get_mmap_read_offset(struct lttng_consumer_stream *stream, | |
1712 | unsigned long *off) | |
3bd1e081 | 1713 | { |
ffe60014 DG |
1714 | assert(stream); |
1715 | assert(stream->ustream); | |
b5c5fc29 | 1716 | |
ffe60014 | 1717 | return ustctl_get_mmap_read_offset(stream->ustream, off); |
3bd1e081 MD |
1718 | } |
1719 | ||
ffe60014 DG |
1720 | /* |
1721 | * Wrapper over the mmap() read offset from ust-ctl library. Since this can be | |
1722 | * compiled out, we isolate it in this library. | |
1723 | */ | |
1724 | void *lttng_ustctl_get_mmap_base(struct lttng_consumer_stream *stream) | |
d056b477 | 1725 | { |
ffe60014 DG |
1726 | assert(stream); |
1727 | assert(stream->ustream); | |
1728 | ||
1729 | return ustctl_get_mmap_base(stream->ustream); | |
d056b477 MD |
1730 | } |
1731 | ||
ffe60014 DG |
1732 | /* |
1733 | * Take a snapshot for a specific fd | |
1734 | * | |
1735 | * Returns 0 on success, < 0 on error | |
1736 | */ | |
1737 | int lttng_ustconsumer_take_snapshot(struct lttng_consumer_stream *stream) | |
3bd1e081 | 1738 | { |
ffe60014 DG |
1739 | assert(stream); |
1740 | assert(stream->ustream); | |
1741 | ||
1742 | return ustctl_snapshot(stream->ustream); | |
3bd1e081 MD |
1743 | } |
1744 | ||
ffe60014 DG |
1745 | /* |
1746 | * Get the produced position | |
1747 | * | |
1748 | * Returns 0 on success, < 0 on error | |
1749 | */ | |
1750 | int lttng_ustconsumer_get_produced_snapshot( | |
1751 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
3bd1e081 | 1752 | { |
ffe60014 DG |
1753 | assert(stream); |
1754 | assert(stream->ustream); | |
1755 | assert(pos); | |
7a57cf92 | 1756 | |
ffe60014 DG |
1757 | return ustctl_snapshot_get_produced(stream->ustream, pos); |
1758 | } | |
7a57cf92 | 1759 | |
10a50311 JD |
1760 | /* |
1761 | * Get the consumed position | |
1762 | * | |
1763 | * Returns 0 on success, < 0 on error | |
1764 | */ | |
1765 | int lttng_ustconsumer_get_consumed_snapshot( | |
1766 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
1767 | { | |
1768 | assert(stream); | |
1769 | assert(stream->ustream); | |
1770 | assert(pos); | |
1771 | ||
1772 | return ustctl_snapshot_get_consumed(stream->ustream, pos); | |
1773 | } | |
1774 | ||
84a182ce DG |
1775 | void lttng_ustconsumer_flush_buffer(struct lttng_consumer_stream *stream, |
1776 | int producer) | |
1777 | { | |
1778 | assert(stream); | |
1779 | assert(stream->ustream); | |
1780 | ||
1781 | ustctl_flush_buffer(stream->ustream, producer); | |
1782 | } | |
1783 | ||
1784 | int lttng_ustconsumer_get_current_timestamp( | |
1785 | struct lttng_consumer_stream *stream, uint64_t *ts) | |
1786 | { | |
1787 | assert(stream); | |
1788 | assert(stream->ustream); | |
1789 | assert(ts); | |
1790 | ||
1791 | return ustctl_get_current_timestamp(stream->ustream, ts); | |
1792 | } | |
1793 | ||
ffe60014 DG |
1794 | /* |
1795 | * Called when the stream signal the consumer that it has hang up. | |
1796 | */ | |
1797 | void lttng_ustconsumer_on_stream_hangup(struct lttng_consumer_stream *stream) | |
1798 | { | |
1799 | assert(stream); | |
1800 | assert(stream->ustream); | |
2c1dd183 | 1801 | |
ffe60014 DG |
1802 | ustctl_flush_buffer(stream->ustream, 0); |
1803 | stream->hangup_flush_done = 1; | |
1804 | } | |
ee77a7b0 | 1805 | |
ffe60014 DG |
1806 | void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan) |
1807 | { | |
4628484a MD |
1808 | int i; |
1809 | ||
ffe60014 DG |
1810 | assert(chan); |
1811 | assert(chan->uchan); | |
e316aad5 | 1812 | |
ea88ca2a MD |
1813 | if (chan->switch_timer_enabled == 1) { |
1814 | consumer_timer_switch_stop(chan); | |
1815 | } | |
1816 | consumer_metadata_cache_destroy(chan); | |
ffe60014 | 1817 | ustctl_destroy_channel(chan->uchan); |
4628484a MD |
1818 | for (i = 0; i < chan->nr_stream_fds; i++) { |
1819 | int ret; | |
1820 | ||
1821 | ret = close(chan->stream_fds[i]); | |
1822 | if (ret) { | |
1823 | PERROR("close"); | |
1824 | } | |
1825 | if (chan->shm_path[0]) { | |
1826 | char shm_path[PATH_MAX]; | |
1827 | ||
1828 | ret = get_stream_shm_path(shm_path, chan->shm_path, i); | |
1829 | if (ret) { | |
1830 | ERR("Cannot get stream shm path"); | |
1831 | } | |
1832 | ret = run_as_unlink(shm_path, chan->uid, chan->gid); | |
1833 | if (ret) { | |
1834 | errno = -ret; | |
1835 | PERROR("unlink %s", shm_path); | |
1836 | } | |
1837 | } | |
1838 | } | |
1839 | free(chan->stream_fds); | |
3d071855 MD |
1840 | /* Try to rmdir all directories under shm_path root. */ |
1841 | if (chan->root_shm_path[0]) { | |
4628484a MD |
1842 | (void) run_as_recursive_rmdir(chan->root_shm_path, |
1843 | chan->uid, chan->gid); | |
3d071855 | 1844 | } |
3bd1e081 MD |
1845 | } |
1846 | ||
1847 | void lttng_ustconsumer_del_stream(struct lttng_consumer_stream *stream) | |
1848 | { | |
ffe60014 DG |
1849 | assert(stream); |
1850 | assert(stream->ustream); | |
d41f73b7 | 1851 | |
ea88ca2a MD |
1852 | if (stream->chan->switch_timer_enabled == 1) { |
1853 | consumer_timer_switch_stop(stream->chan); | |
1854 | } | |
ffe60014 DG |
1855 | ustctl_destroy_stream(stream->ustream); |
1856 | } | |
d41f73b7 | 1857 | |
6d574024 DG |
1858 | int lttng_ustconsumer_get_wakeup_fd(struct lttng_consumer_stream *stream) |
1859 | { | |
1860 | assert(stream); | |
1861 | assert(stream->ustream); | |
1862 | ||
1863 | return ustctl_stream_get_wakeup_fd(stream->ustream); | |
1864 | } | |
1865 | ||
1866 | int lttng_ustconsumer_close_wakeup_fd(struct lttng_consumer_stream *stream) | |
1867 | { | |
1868 | assert(stream); | |
1869 | assert(stream->ustream); | |
1870 | ||
1871 | return ustctl_stream_close_wakeup_fd(stream->ustream); | |
1872 | } | |
1873 | ||
309167d2 JD |
1874 | /* |
1875 | * Populate index values of a UST stream. Values are set in big endian order. | |
1876 | * | |
1877 | * Return 0 on success or else a negative value. | |
1878 | */ | |
50adc264 | 1879 | static int get_index_values(struct ctf_packet_index *index, |
309167d2 JD |
1880 | struct ustctl_consumer_stream *ustream) |
1881 | { | |
1882 | int ret; | |
1883 | ||
1884 | ret = ustctl_get_timestamp_begin(ustream, &index->timestamp_begin); | |
1885 | if (ret < 0) { | |
1886 | PERROR("ustctl_get_timestamp_begin"); | |
1887 | goto error; | |
1888 | } | |
1889 | index->timestamp_begin = htobe64(index->timestamp_begin); | |
1890 | ||
1891 | ret = ustctl_get_timestamp_end(ustream, &index->timestamp_end); | |
1892 | if (ret < 0) { | |
1893 | PERROR("ustctl_get_timestamp_end"); | |
1894 | goto error; | |
1895 | } | |
1896 | index->timestamp_end = htobe64(index->timestamp_end); | |
1897 | ||
1898 | ret = ustctl_get_events_discarded(ustream, &index->events_discarded); | |
1899 | if (ret < 0) { | |
1900 | PERROR("ustctl_get_events_discarded"); | |
1901 | goto error; | |
1902 | } | |
1903 | index->events_discarded = htobe64(index->events_discarded); | |
1904 | ||
1905 | ret = ustctl_get_content_size(ustream, &index->content_size); | |
1906 | if (ret < 0) { | |
1907 | PERROR("ustctl_get_content_size"); | |
1908 | goto error; | |
1909 | } | |
1910 | index->content_size = htobe64(index->content_size); | |
1911 | ||
1912 | ret = ustctl_get_packet_size(ustream, &index->packet_size); | |
1913 | if (ret < 0) { | |
1914 | PERROR("ustctl_get_packet_size"); | |
1915 | goto error; | |
1916 | } | |
1917 | index->packet_size = htobe64(index->packet_size); | |
1918 | ||
1919 | ret = ustctl_get_stream_id(ustream, &index->stream_id); | |
1920 | if (ret < 0) { | |
1921 | PERROR("ustctl_get_stream_id"); | |
1922 | goto error; | |
1923 | } | |
1924 | index->stream_id = htobe64(index->stream_id); | |
1925 | ||
1926 | error: | |
1927 | return ret; | |
1928 | } | |
1929 | ||
94d49140 JD |
1930 | /* |
1931 | * Write up to one packet from the metadata cache to the channel. | |
1932 | * | |
1933 | * Returns the number of bytes pushed in the cache, or a negative value | |
1934 | * on error. | |
1935 | */ | |
1936 | static | |
1937 | int commit_one_metadata_packet(struct lttng_consumer_stream *stream) | |
1938 | { | |
1939 | ssize_t write_len; | |
1940 | int ret; | |
1941 | ||
1942 | pthread_mutex_lock(&stream->chan->metadata_cache->lock); | |
1943 | if (stream->chan->metadata_cache->contiguous | |
1944 | == stream->ust_metadata_pushed) { | |
1945 | ret = 0; | |
1946 | goto end; | |
1947 | } | |
1948 | ||
1949 | write_len = ustctl_write_one_packet_to_channel(stream->chan->uchan, | |
1950 | &stream->chan->metadata_cache->data[stream->ust_metadata_pushed], | |
1951 | stream->chan->metadata_cache->contiguous | |
1952 | - stream->ust_metadata_pushed); | |
1953 | assert(write_len != 0); | |
1954 | if (write_len < 0) { | |
1955 | ERR("Writing one metadata packet"); | |
1956 | ret = -1; | |
1957 | goto end; | |
1958 | } | |
1959 | stream->ust_metadata_pushed += write_len; | |
1960 | ||
1961 | assert(stream->chan->metadata_cache->contiguous >= | |
1962 | stream->ust_metadata_pushed); | |
1963 | ret = write_len; | |
1964 | ||
1965 | end: | |
1966 | pthread_mutex_unlock(&stream->chan->metadata_cache->lock); | |
1967 | return ret; | |
1968 | } | |
1969 | ||
309167d2 | 1970 | |
94d49140 JD |
1971 | /* |
1972 | * Sync metadata meaning request them to the session daemon and snapshot to the | |
1973 | * metadata thread can consumer them. | |
1974 | * | |
1975 | * Metadata stream lock MUST be acquired. | |
1976 | * | |
1977 | * Return 0 if new metadatda is available, EAGAIN if the metadata stream | |
1978 | * is empty or a negative value on error. | |
1979 | */ | |
1980 | int lttng_ustconsumer_sync_metadata(struct lttng_consumer_local_data *ctx, | |
1981 | struct lttng_consumer_stream *metadata) | |
1982 | { | |
1983 | int ret; | |
1984 | int retry = 0; | |
1985 | ||
1986 | assert(ctx); | |
1987 | assert(metadata); | |
1988 | ||
1989 | /* | |
1990 | * Request metadata from the sessiond, but don't wait for the flush | |
1991 | * because we locked the metadata thread. | |
1992 | */ | |
1993 | ret = lttng_ustconsumer_request_metadata(ctx, metadata->chan, 0, 0); | |
1994 | if (ret < 0) { | |
1995 | goto end; | |
1996 | } | |
1997 | ||
1998 | ret = commit_one_metadata_packet(metadata); | |
1999 | if (ret <= 0) { | |
2000 | goto end; | |
2001 | } else if (ret > 0) { | |
2002 | retry = 1; | |
2003 | } | |
2004 | ||
2005 | ustctl_flush_buffer(metadata->ustream, 1); | |
2006 | ret = ustctl_snapshot(metadata->ustream); | |
2007 | if (ret < 0) { | |
2008 | if (errno != EAGAIN) { | |
2009 | ERR("Sync metadata, taking UST snapshot"); | |
2010 | goto end; | |
2011 | } | |
2012 | DBG("No new metadata when syncing them."); | |
2013 | /* No new metadata, exit. */ | |
2014 | ret = ENODATA; | |
2015 | goto end; | |
2016 | } | |
2017 | ||
2018 | /* | |
2019 | * After this flush, we still need to extract metadata. | |
2020 | */ | |
2021 | if (retry) { | |
2022 | ret = EAGAIN; | |
2023 | } | |
2024 | ||
2025 | end: | |
2026 | return ret; | |
2027 | } | |
2028 | ||
02b3d176 DG |
2029 | /* |
2030 | * Return 0 on success else a negative value. | |
2031 | */ | |
2032 | static int notify_if_more_data(struct lttng_consumer_stream *stream, | |
2033 | struct lttng_consumer_local_data *ctx) | |
2034 | { | |
2035 | int ret; | |
2036 | struct ustctl_consumer_stream *ustream; | |
2037 | ||
2038 | assert(stream); | |
2039 | assert(ctx); | |
2040 | ||
2041 | ustream = stream->ustream; | |
2042 | ||
2043 | /* | |
2044 | * First, we are going to check if there is a new subbuffer available | |
2045 | * before reading the stream wait_fd. | |
2046 | */ | |
2047 | /* Get the next subbuffer */ | |
2048 | ret = ustctl_get_next_subbuf(ustream); | |
2049 | if (ret) { | |
2050 | /* No more data found, flag the stream. */ | |
2051 | stream->has_data = 0; | |
2052 | ret = 0; | |
2053 | goto end; | |
2054 | } | |
2055 | ||
5420e5db | 2056 | ret = ustctl_put_subbuf(ustream); |
02b3d176 DG |
2057 | assert(!ret); |
2058 | ||
2059 | /* This stream still has data. Flag it and wake up the data thread. */ | |
2060 | stream->has_data = 1; | |
2061 | ||
2062 | if (stream->monitor && !stream->hangup_flush_done && !ctx->has_wakeup) { | |
2063 | ssize_t writelen; | |
2064 | ||
2065 | writelen = lttng_pipe_write(ctx->consumer_wakeup_pipe, "!", 1); | |
2066 | if (writelen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) { | |
2067 | ret = writelen; | |
2068 | goto end; | |
2069 | } | |
2070 | ||
2071 | /* The wake up pipe has been notified. */ | |
2072 | ctx->has_wakeup = 1; | |
2073 | } | |
2074 | ret = 0; | |
2075 | ||
2076 | end: | |
2077 | return ret; | |
2078 | } | |
2079 | ||
94d49140 JD |
2080 | /* |
2081 | * Read subbuffer from the given stream. | |
2082 | * | |
2083 | * Stream lock MUST be acquired. | |
2084 | * | |
2085 | * Return 0 on success else a negative value. | |
2086 | */ | |
d41f73b7 MD |
2087 | int lttng_ustconsumer_read_subbuffer(struct lttng_consumer_stream *stream, |
2088 | struct lttng_consumer_local_data *ctx) | |
2089 | { | |
1d4dfdef | 2090 | unsigned long len, subbuf_size, padding; |
1c20f0e2 | 2091 | int err, write_index = 1; |
d41f73b7 | 2092 | long ret = 0; |
ffe60014 | 2093 | struct ustctl_consumer_stream *ustream; |
50adc264 | 2094 | struct ctf_packet_index index; |
ffe60014 DG |
2095 | |
2096 | assert(stream); | |
2097 | assert(stream->ustream); | |
2098 | assert(ctx); | |
d41f73b7 | 2099 | |
3eb914c0 | 2100 | DBG("In UST read_subbuffer (wait_fd: %d, name: %s)", stream->wait_fd, |
ffe60014 DG |
2101 | stream->name); |
2102 | ||
2103 | /* Ease our life for what's next. */ | |
2104 | ustream = stream->ustream; | |
d41f73b7 | 2105 | |
6cd525e8 | 2106 | /* |
02b3d176 DG |
2107 | * We can consume the 1 byte written into the wait_fd by UST. Don't trigger |
2108 | * error if we cannot read this one byte (read returns 0), or if the error | |
2109 | * is EAGAIN or EWOULDBLOCK. | |
2110 | * | |
2111 | * This is only done when the stream is monitored by a thread, before the | |
2112 | * flush is done after a hangup and if the stream is not flagged with data | |
2113 | * since there might be nothing to consume in the wait fd but still have | |
2114 | * data available flagged by the consumer wake up pipe. | |
6cd525e8 | 2115 | */ |
02b3d176 DG |
2116 | if (stream->monitor && !stream->hangup_flush_done && !stream->has_data) { |
2117 | char dummy; | |
c617c0c6 MD |
2118 | ssize_t readlen; |
2119 | ||
6cd525e8 MD |
2120 | readlen = lttng_read(stream->wait_fd, &dummy, 1); |
2121 | if (readlen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) { | |
effcf122 MD |
2122 | ret = readlen; |
2123 | goto end; | |
2124 | } | |
d41f73b7 MD |
2125 | } |
2126 | ||
04ef1097 | 2127 | retry: |
d41f73b7 | 2128 | /* Get the next subbuffer */ |
ffe60014 | 2129 | err = ustctl_get_next_subbuf(ustream); |
d41f73b7 | 2130 | if (err != 0) { |
04ef1097 MD |
2131 | /* |
2132 | * Populate metadata info if the existing info has | |
2133 | * already been read. | |
2134 | */ | |
2135 | if (stream->metadata_flag) { | |
94d49140 JD |
2136 | ret = commit_one_metadata_packet(stream); |
2137 | if (ret <= 0) { | |
04ef1097 MD |
2138 | goto end; |
2139 | } | |
04ef1097 MD |
2140 | ustctl_flush_buffer(stream->ustream, 1); |
2141 | goto retry; | |
2142 | } | |
2143 | ||
1d4dfdef | 2144 | ret = err; /* ustctl_get_next_subbuf returns negative, caller expect positive. */ |
d41f73b7 MD |
2145 | /* |
2146 | * This is a debug message even for single-threaded consumer, | |
2147 | * because poll() have more relaxed criterions than get subbuf, | |
2148 | * so get_subbuf may fail for short race windows where poll() | |
2149 | * would issue wakeups. | |
2150 | */ | |
2151 | DBG("Reserving sub buffer failed (everything is normal, " | |
ffe60014 | 2152 | "it is due to concurrency) [ret: %d]", err); |
d41f73b7 MD |
2153 | goto end; |
2154 | } | |
ffe60014 | 2155 | assert(stream->chan->output == CONSUMER_CHANNEL_MMAP); |
309167d2 | 2156 | |
1c20f0e2 | 2157 | if (!stream->metadata_flag) { |
309167d2 JD |
2158 | index.offset = htobe64(stream->out_fd_offset); |
2159 | ret = get_index_values(&index, ustream); | |
2160 | if (ret < 0) { | |
2161 | goto end; | |
2162 | } | |
1c20f0e2 JD |
2163 | } else { |
2164 | write_index = 0; | |
309167d2 JD |
2165 | } |
2166 | ||
1d4dfdef | 2167 | /* Get the full padded subbuffer size */ |
ffe60014 | 2168 | err = ustctl_get_padded_subbuf_size(ustream, &len); |
effcf122 | 2169 | assert(err == 0); |
1d4dfdef DG |
2170 | |
2171 | /* Get subbuffer data size (without padding) */ | |
ffe60014 | 2172 | err = ustctl_get_subbuf_size(ustream, &subbuf_size); |
1d4dfdef DG |
2173 | assert(err == 0); |
2174 | ||
2175 | /* Make sure we don't get a subbuffer size bigger than the padded */ | |
2176 | assert(len >= subbuf_size); | |
2177 | ||
2178 | padding = len - subbuf_size; | |
d41f73b7 | 2179 | /* write the subbuffer to the tracefile */ |
309167d2 | 2180 | ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, padding, &index); |
91dfef6e DG |
2181 | /* |
2182 | * The mmap operation should write subbuf_size amount of data when network | |
2183 | * streaming or the full padding (len) size when we are _not_ streaming. | |
2184 | */ | |
d88aee68 DG |
2185 | if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) || |
2186 | (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) { | |
d41f73b7 | 2187 | /* |
91dfef6e | 2188 | * Display the error but continue processing to try to release the |
c5c45efa DG |
2189 | * subbuffer. This is a DBG statement since any unexpected kill or |
2190 | * signal, the application gets unregistered, relayd gets closed or | |
2191 | * anything that affects the buffer lifetime will trigger this error. | |
2192 | * So, for the sake of the user, don't print this error since it can | |
2193 | * happen and it is OK with the code flow. | |
d41f73b7 | 2194 | */ |
c5c45efa | 2195 | DBG("Error writing to tracefile " |
8fd623e0 | 2196 | "(ret: %ld != len: %lu != subbuf_size: %lu)", |
91dfef6e | 2197 | ret, len, subbuf_size); |
309167d2 | 2198 | write_index = 0; |
d41f73b7 | 2199 | } |
ffe60014 | 2200 | err = ustctl_put_next_subbuf(ustream); |
effcf122 | 2201 | assert(err == 0); |
331744e3 | 2202 | |
02b3d176 DG |
2203 | /* |
2204 | * This will consumer the byte on the wait_fd if and only if there is not | |
2205 | * next subbuffer to be acquired. | |
2206 | */ | |
2207 | if (!stream->metadata_flag) { | |
2208 | ret = notify_if_more_data(stream, ctx); | |
2209 | if (ret < 0) { | |
2210 | goto end; | |
2211 | } | |
2212 | } | |
2213 | ||
309167d2 | 2214 | /* Write index if needed. */ |
1c20f0e2 JD |
2215 | if (!write_index) { |
2216 | goto end; | |
2217 | } | |
2218 | ||
94d49140 JD |
2219 | if (stream->chan->live_timer_interval && !stream->metadata_flag) { |
2220 | /* | |
2221 | * In live, block until all the metadata is sent. | |
2222 | */ | |
2223 | err = consumer_stream_sync_metadata(ctx, stream->session_id); | |
2224 | if (err < 0) { | |
2225 | goto end; | |
2226 | } | |
2227 | } | |
2228 | ||
1c20f0e2 JD |
2229 | assert(!stream->metadata_flag); |
2230 | err = consumer_stream_write_index(stream, &index); | |
2231 | if (err < 0) { | |
2232 | goto end; | |
309167d2 JD |
2233 | } |
2234 | ||
d41f73b7 MD |
2235 | end: |
2236 | return ret; | |
2237 | } | |
2238 | ||
ffe60014 DG |
2239 | /* |
2240 | * Called when a stream is created. | |
fe4477ee JD |
2241 | * |
2242 | * Return 0 on success or else a negative value. | |
ffe60014 | 2243 | */ |
d41f73b7 MD |
2244 | int lttng_ustconsumer_on_recv_stream(struct lttng_consumer_stream *stream) |
2245 | { | |
fe4477ee JD |
2246 | int ret; |
2247 | ||
10a50311 JD |
2248 | assert(stream); |
2249 | ||
fe4477ee | 2250 | /* Don't create anything if this is set for streaming. */ |
10a50311 | 2251 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor) { |
fe4477ee JD |
2252 | ret = utils_create_stream_file(stream->chan->pathname, stream->name, |
2253 | stream->chan->tracefile_size, stream->tracefile_count_current, | |
309167d2 | 2254 | stream->uid, stream->gid, NULL); |
fe4477ee JD |
2255 | if (ret < 0) { |
2256 | goto error; | |
2257 | } | |
2258 | stream->out_fd = ret; | |
2259 | stream->tracefile_size_current = 0; | |
309167d2 JD |
2260 | |
2261 | if (!stream->metadata_flag) { | |
2262 | ret = index_create_file(stream->chan->pathname, | |
2263 | stream->name, stream->uid, stream->gid, | |
2264 | stream->chan->tracefile_size, | |
2265 | stream->tracefile_count_current); | |
2266 | if (ret < 0) { | |
2267 | goto error; | |
2268 | } | |
2269 | stream->index_fd = ret; | |
2270 | } | |
fe4477ee JD |
2271 | } |
2272 | ret = 0; | |
2273 | ||
2274 | error: | |
2275 | return ret; | |
d41f73b7 | 2276 | } |
ca22feea DG |
2277 | |
2278 | /* | |
2279 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
2280 | * stream. Consumer data lock MUST be acquired before calling this function |
2281 | * and the stream lock. | |
ca22feea | 2282 | * |
6d805429 | 2283 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
2284 | * data is available for trace viewer reading. |
2285 | */ | |
6d805429 | 2286 | int lttng_ustconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
2287 | { |
2288 | int ret; | |
2289 | ||
2290 | assert(stream); | |
ffe60014 | 2291 | assert(stream->ustream); |
ca22feea | 2292 | |
6d805429 | 2293 | DBG("UST consumer checking data pending"); |
c8f59ee5 | 2294 | |
ca6b395f MD |
2295 | if (stream->endpoint_status != CONSUMER_ENDPOINT_ACTIVE) { |
2296 | ret = 0; | |
2297 | goto end; | |
2298 | } | |
2299 | ||
04ef1097 | 2300 | if (stream->chan->type == CONSUMER_CHANNEL_TYPE_METADATA) { |
e6ee4eab DG |
2301 | uint64_t contiguous, pushed; |
2302 | ||
2303 | /* Ease our life a bit. */ | |
2304 | contiguous = stream->chan->metadata_cache->contiguous; | |
2305 | pushed = stream->ust_metadata_pushed; | |
2306 | ||
04ef1097 MD |
2307 | /* |
2308 | * We can simply check whether all contiguously available data | |
2309 | * has been pushed to the ring buffer, since the push operation | |
2310 | * is performed within get_next_subbuf(), and because both | |
2311 | * get_next_subbuf() and put_next_subbuf() are issued atomically | |
2312 | * thanks to the stream lock within | |
2313 | * lttng_ustconsumer_read_subbuffer(). This basically means that | |
2314 | * whetnever ust_metadata_pushed is incremented, the associated | |
2315 | * metadata has been consumed from the metadata stream. | |
2316 | */ | |
2317 | DBG("UST consumer metadata pending check: contiguous %" PRIu64 " vs pushed %" PRIu64, | |
e6ee4eab | 2318 | contiguous, pushed); |
aa01b94c | 2319 | assert(((int64_t) (contiguous - pushed)) >= 0); |
e6ee4eab | 2320 | if ((contiguous != pushed) || |
6acdf328 | 2321 | (((int64_t) contiguous - pushed) > 0 || contiguous == 0)) { |
04ef1097 MD |
2322 | ret = 1; /* Data is pending */ |
2323 | goto end; | |
2324 | } | |
2325 | } else { | |
2326 | ret = ustctl_get_next_subbuf(stream->ustream); | |
2327 | if (ret == 0) { | |
2328 | /* | |
2329 | * There is still data so let's put back this | |
2330 | * subbuffer. | |
2331 | */ | |
2332 | ret = ustctl_put_subbuf(stream->ustream); | |
2333 | assert(ret == 0); | |
2334 | ret = 1; /* Data is pending */ | |
2335 | goto end; | |
2336 | } | |
ca22feea DG |
2337 | } |
2338 | ||
6d805429 DG |
2339 | /* Data is NOT pending so ready to be read. */ |
2340 | ret = 0; | |
ca22feea | 2341 | |
6efae65e DG |
2342 | end: |
2343 | return ret; | |
ca22feea | 2344 | } |
d88aee68 | 2345 | |
6d574024 DG |
2346 | /* |
2347 | * Stop a given metadata channel timer if enabled and close the wait fd which | |
2348 | * is the poll pipe of the metadata stream. | |
2349 | * | |
2350 | * This MUST be called with the metadata channel acquired. | |
2351 | */ | |
2352 | void lttng_ustconsumer_close_metadata(struct lttng_consumer_channel *metadata) | |
2353 | { | |
2354 | int ret; | |
2355 | ||
2356 | assert(metadata); | |
2357 | assert(metadata->type == CONSUMER_CHANNEL_TYPE_METADATA); | |
2358 | ||
2359 | DBG("Closing metadata channel key %" PRIu64, metadata->key); | |
2360 | ||
2361 | if (metadata->switch_timer_enabled == 1) { | |
2362 | consumer_timer_switch_stop(metadata); | |
2363 | } | |
2364 | ||
2365 | if (!metadata->metadata_stream) { | |
2366 | goto end; | |
2367 | } | |
2368 | ||
2369 | /* | |
2370 | * Closing write side so the thread monitoring the stream wakes up if any | |
2371 | * and clean the metadata stream. | |
2372 | */ | |
2373 | if (metadata->metadata_stream->ust_metadata_poll_pipe[1] >= 0) { | |
2374 | ret = close(metadata->metadata_stream->ust_metadata_poll_pipe[1]); | |
2375 | if (ret < 0) { | |
2376 | PERROR("closing metadata pipe write side"); | |
2377 | } | |
2378 | metadata->metadata_stream->ust_metadata_poll_pipe[1] = -1; | |
2379 | } | |
2380 | ||
2381 | end: | |
2382 | return; | |
2383 | } | |
2384 | ||
d88aee68 DG |
2385 | /* |
2386 | * Close every metadata stream wait fd of the metadata hash table. This | |
2387 | * function MUST be used very carefully so not to run into a race between the | |
2388 | * metadata thread handling streams and this function closing their wait fd. | |
2389 | * | |
2390 | * For UST, this is used when the session daemon hangs up. Its the metadata | |
2391 | * producer so calling this is safe because we are assured that no state change | |
2392 | * can occur in the metadata thread for the streams in the hash table. | |
2393 | */ | |
6d574024 | 2394 | void lttng_ustconsumer_close_all_metadata(struct lttng_ht *metadata_ht) |
d88aee68 | 2395 | { |
d88aee68 DG |
2396 | struct lttng_ht_iter iter; |
2397 | struct lttng_consumer_stream *stream; | |
2398 | ||
2399 | assert(metadata_ht); | |
2400 | assert(metadata_ht->ht); | |
2401 | ||
2402 | DBG("UST consumer closing all metadata streams"); | |
2403 | ||
2404 | rcu_read_lock(); | |
2405 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, | |
2406 | node.node) { | |
9ce5646a MD |
2407 | |
2408 | health_code_update(); | |
2409 | ||
be2b50c7 | 2410 | pthread_mutex_lock(&stream->chan->lock); |
6d574024 | 2411 | lttng_ustconsumer_close_metadata(stream->chan); |
be2b50c7 DG |
2412 | pthread_mutex_unlock(&stream->chan->lock); |
2413 | ||
d88aee68 DG |
2414 | } |
2415 | rcu_read_unlock(); | |
2416 | } | |
d8ef542d MD |
2417 | |
2418 | void lttng_ustconsumer_close_stream_wakeup(struct lttng_consumer_stream *stream) | |
2419 | { | |
2420 | int ret; | |
2421 | ||
2422 | ret = ustctl_stream_close_wakeup_fd(stream->ustream); | |
2423 | if (ret < 0) { | |
2424 | ERR("Unable to close wakeup fd"); | |
2425 | } | |
2426 | } | |
331744e3 | 2427 | |
f666ae70 MD |
2428 | /* |
2429 | * Please refer to consumer-timer.c before adding any lock within this | |
2430 | * function or any of its callees. Timers have a very strict locking | |
2431 | * semantic with respect to teardown. Failure to respect this semantic | |
2432 | * introduces deadlocks. | |
2433 | */ | |
331744e3 | 2434 | int lttng_ustconsumer_request_metadata(struct lttng_consumer_local_data *ctx, |
94d49140 | 2435 | struct lttng_consumer_channel *channel, int timer, int wait) |
331744e3 JD |
2436 | { |
2437 | struct lttcomm_metadata_request_msg request; | |
2438 | struct lttcomm_consumer_msg msg; | |
0c759fc9 | 2439 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
331744e3 JD |
2440 | uint64_t len, key, offset; |
2441 | int ret; | |
2442 | ||
2443 | assert(channel); | |
2444 | assert(channel->metadata_cache); | |
2445 | ||
53efb85a MD |
2446 | memset(&request, 0, sizeof(request)); |
2447 | ||
331744e3 JD |
2448 | /* send the metadata request to sessiond */ |
2449 | switch (consumer_data.type) { | |
2450 | case LTTNG_CONSUMER64_UST: | |
2451 | request.bits_per_long = 64; | |
2452 | break; | |
2453 | case LTTNG_CONSUMER32_UST: | |
2454 | request.bits_per_long = 32; | |
2455 | break; | |
2456 | default: | |
2457 | request.bits_per_long = 0; | |
2458 | break; | |
2459 | } | |
2460 | ||
2461 | request.session_id = channel->session_id; | |
1950109e | 2462 | request.session_id_per_pid = channel->session_id_per_pid; |
567eb353 DG |
2463 | /* |
2464 | * Request the application UID here so the metadata of that application can | |
2465 | * be sent back. The channel UID corresponds to the user UID of the session | |
2466 | * used for the rights on the stream file(s). | |
2467 | */ | |
2468 | request.uid = channel->ust_app_uid; | |
331744e3 | 2469 | request.key = channel->key; |
567eb353 | 2470 | |
1950109e | 2471 | DBG("Sending metadata request to sessiond, session id %" PRIu64 |
567eb353 DG |
2472 | ", per-pid %" PRIu64 ", app UID %u and channek key %" PRIu64, |
2473 | request.session_id, request.session_id_per_pid, request.uid, | |
2474 | request.key); | |
331744e3 | 2475 | |
75d83e50 | 2476 | pthread_mutex_lock(&ctx->metadata_socket_lock); |
9ce5646a MD |
2477 | |
2478 | health_code_update(); | |
2479 | ||
331744e3 JD |
2480 | ret = lttcomm_send_unix_sock(ctx->consumer_metadata_socket, &request, |
2481 | sizeof(request)); | |
2482 | if (ret < 0) { | |
2483 | ERR("Asking metadata to sessiond"); | |
2484 | goto end; | |
2485 | } | |
2486 | ||
9ce5646a MD |
2487 | health_code_update(); |
2488 | ||
331744e3 JD |
2489 | /* Receive the metadata from sessiond */ |
2490 | ret = lttcomm_recv_unix_sock(ctx->consumer_metadata_socket, &msg, | |
2491 | sizeof(msg)); | |
2492 | if (ret != sizeof(msg)) { | |
8fd623e0 | 2493 | DBG("Consumer received unexpected message size %d (expects %zu)", |
331744e3 JD |
2494 | ret, sizeof(msg)); |
2495 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); | |
2496 | /* | |
2497 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
2498 | * since the caller handles this. | |
2499 | */ | |
2500 | goto end; | |
2501 | } | |
2502 | ||
9ce5646a MD |
2503 | health_code_update(); |
2504 | ||
331744e3 JD |
2505 | if (msg.cmd_type == LTTNG_ERR_UND) { |
2506 | /* No registry found */ | |
2507 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, | |
2508 | ret_code); | |
2509 | ret = 0; | |
2510 | goto end; | |
2511 | } else if (msg.cmd_type != LTTNG_CONSUMER_PUSH_METADATA) { | |
2512 | ERR("Unexpected cmd_type received %d", msg.cmd_type); | |
2513 | ret = -1; | |
2514 | goto end; | |
2515 | } | |
2516 | ||
2517 | len = msg.u.push_metadata.len; | |
2518 | key = msg.u.push_metadata.key; | |
2519 | offset = msg.u.push_metadata.target_offset; | |
2520 | ||
2521 | assert(key == channel->key); | |
2522 | if (len == 0) { | |
2523 | DBG("No new metadata to receive for key %" PRIu64, key); | |
2524 | } | |
2525 | ||
9ce5646a MD |
2526 | health_code_update(); |
2527 | ||
331744e3 JD |
2528 | /* Tell session daemon we are ready to receive the metadata. */ |
2529 | ret = consumer_send_status_msg(ctx->consumer_metadata_socket, | |
0c759fc9 | 2530 | LTTCOMM_CONSUMERD_SUCCESS); |
331744e3 JD |
2531 | if (ret < 0 || len == 0) { |
2532 | /* | |
2533 | * Somehow, the session daemon is not responding anymore or there is | |
2534 | * nothing to receive. | |
2535 | */ | |
2536 | goto end; | |
2537 | } | |
2538 | ||
9ce5646a MD |
2539 | health_code_update(); |
2540 | ||
1eb682be | 2541 | ret = lttng_ustconsumer_recv_metadata(ctx->consumer_metadata_socket, |
94d49140 | 2542 | key, offset, len, channel, timer, wait); |
1eb682be | 2543 | if (ret >= 0) { |
f2a444f1 DG |
2544 | /* |
2545 | * Only send the status msg if the sessiond is alive meaning a positive | |
2546 | * ret code. | |
2547 | */ | |
1eb682be | 2548 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, ret); |
f2a444f1 | 2549 | } |
331744e3 JD |
2550 | ret = 0; |
2551 | ||
2552 | end: | |
9ce5646a MD |
2553 | health_code_update(); |
2554 | ||
75d83e50 | 2555 | pthread_mutex_unlock(&ctx->metadata_socket_lock); |
331744e3 JD |
2556 | return ret; |
2557 | } | |
70190e1c DG |
2558 | |
2559 | /* | |
2560 | * Return the ustctl call for the get stream id. | |
2561 | */ | |
2562 | int lttng_ustconsumer_get_stream_id(struct lttng_consumer_stream *stream, | |
2563 | uint64_t *stream_id) | |
2564 | { | |
2565 | assert(stream); | |
2566 | assert(stream_id); | |
2567 | ||
2568 | return ustctl_get_stream_id(stream->ustream, stream_id); | |
2569 | } |