Commit | Line | Data |
---|---|---|
3bd1e081 | 1 | /* |
ab5be9fa MJ |
2 | * Copyright (C) 2011 Julien Desfossez <julien.desfossez@polymtl.ca> |
3 | * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
4 | * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
3bd1e081 | 5 | * |
ab5be9fa | 6 | * SPDX-License-Identifier: GPL-2.0-only |
3bd1e081 | 7 | * |
3bd1e081 MD |
8 | */ |
9 | ||
6c1c0768 | 10 | #define _LGPL_SOURCE |
3bd1e081 | 11 | #include <assert.h> |
f02e1e8a | 12 | #include <lttng/ust-ctl.h> |
3bd1e081 MD |
13 | #include <poll.h> |
14 | #include <pthread.h> | |
15 | #include <stdlib.h> | |
16 | #include <string.h> | |
17 | #include <sys/mman.h> | |
18 | #include <sys/socket.h> | |
dbb5dfe6 | 19 | #include <sys/stat.h> |
3bd1e081 | 20 | #include <sys/types.h> |
77c7c900 | 21 | #include <inttypes.h> |
3bd1e081 | 22 | #include <unistd.h> |
ffe60014 | 23 | #include <urcu/list.h> |
331744e3 | 24 | #include <signal.h> |
02d02e31 | 25 | #include <stdbool.h> |
6f9449c2 | 26 | #include <stdint.h> |
0857097f | 27 | |
51a9e1c7 | 28 | #include <bin/lttng-consumerd/health-consumerd.h> |
990570ed | 29 | #include <common/common.h> |
10a8a223 | 30 | #include <common/sessiond-comm/sessiond-comm.h> |
00e2e675 | 31 | #include <common/relayd/relayd.h> |
dbb5dfe6 | 32 | #include <common/compat/fcntl.h> |
f263b7fd | 33 | #include <common/compat/endian.h> |
c8fea79c JR |
34 | #include <common/consumer/consumer-metadata-cache.h> |
35 | #include <common/consumer/consumer-stream.h> | |
36 | #include <common/consumer/consumer-timer.h> | |
fe4477ee | 37 | #include <common/utils.h> |
309167d2 | 38 | #include <common/index/index.h> |
6f9449c2 | 39 | #include <common/consumer/consumer.h> |
f5ba75b4 | 40 | #include <common/optional.h> |
10a8a223 DG |
41 | |
42 | #include "ust-consumer.h" | |
3bd1e081 | 43 | |
45863397 | 44 | #define INT_MAX_STR_LEN 12 /* includes \0 */ |
4628484a | 45 | |
3bd1e081 MD |
46 | extern struct lttng_consumer_global_data consumer_data; |
47 | extern int consumer_poll_timeout; | |
3bd1e081 MD |
48 | |
49 | /* | |
ffe60014 DG |
50 | * Free channel object and all streams associated with it. This MUST be used |
51 | * only and only if the channel has _NEVER_ been added to the global channel | |
52 | * hash table. | |
3bd1e081 | 53 | */ |
ffe60014 | 54 | static void destroy_channel(struct lttng_consumer_channel *channel) |
3bd1e081 | 55 | { |
ffe60014 DG |
56 | struct lttng_consumer_stream *stream, *stmp; |
57 | ||
58 | assert(channel); | |
59 | ||
60 | DBG("UST consumer cleaning stream list"); | |
61 | ||
62 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
63 | send_node) { | |
9ce5646a MD |
64 | |
65 | health_code_update(); | |
66 | ||
ffe60014 DG |
67 | cds_list_del(&stream->send_node); |
68 | ustctl_destroy_stream(stream->ustream); | |
d2956687 | 69 | lttng_trace_chunk_put(stream->trace_chunk); |
ffe60014 DG |
70 | free(stream); |
71 | } | |
72 | ||
73 | /* | |
74 | * If a channel is available meaning that was created before the streams | |
75 | * were, delete it. | |
76 | */ | |
77 | if (channel->uchan) { | |
78 | lttng_ustconsumer_del_channel(channel); | |
b83e03c4 | 79 | lttng_ustconsumer_free_channel(channel); |
ffe60014 DG |
80 | } |
81 | free(channel); | |
82 | } | |
3bd1e081 MD |
83 | |
84 | /* | |
ffe60014 | 85 | * Add channel to internal consumer state. |
3bd1e081 | 86 | * |
ffe60014 | 87 | * Returns 0 on success or else a negative value. |
3bd1e081 | 88 | */ |
ffe60014 DG |
89 | static int add_channel(struct lttng_consumer_channel *channel, |
90 | struct lttng_consumer_local_data *ctx) | |
3bd1e081 MD |
91 | { |
92 | int ret = 0; | |
93 | ||
ffe60014 DG |
94 | assert(channel); |
95 | assert(ctx); | |
96 | ||
97 | if (ctx->on_recv_channel != NULL) { | |
98 | ret = ctx->on_recv_channel(channel); | |
99 | if (ret == 0) { | |
d8ef542d | 100 | ret = consumer_add_channel(channel, ctx); |
ffe60014 DG |
101 | } else if (ret < 0) { |
102 | /* Most likely an ENOMEM. */ | |
103 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
104 | goto error; | |
105 | } | |
106 | } else { | |
d8ef542d | 107 | ret = consumer_add_channel(channel, ctx); |
3bd1e081 MD |
108 | } |
109 | ||
d88aee68 | 110 | DBG("UST consumer channel added (key: %" PRIu64 ")", channel->key); |
ffe60014 DG |
111 | |
112 | error: | |
3bd1e081 MD |
113 | return ret; |
114 | } | |
115 | ||
ffe60014 DG |
116 | /* |
117 | * Allocate and return a consumer stream object. If _alloc_ret is not NULL, the | |
118 | * error value if applicable is set in it else it is kept untouched. | |
3bd1e081 | 119 | * |
ffe60014 | 120 | * Return NULL on error else the newly allocated stream object. |
3bd1e081 | 121 | */ |
ffe60014 DG |
122 | static struct lttng_consumer_stream *allocate_stream(int cpu, int key, |
123 | struct lttng_consumer_channel *channel, | |
d2956687 | 124 | struct lttng_consumer_local_data *ctx, int *_alloc_ret) |
ffe60014 DG |
125 | { |
126 | int alloc_ret; | |
127 | struct lttng_consumer_stream *stream = NULL; | |
128 | ||
129 | assert(channel); | |
130 | assert(ctx); | |
131 | ||
6f9449c2 | 132 | stream = consumer_stream_create( |
49f45573 JG |
133 | channel, |
134 | channel->key, | |
ffe60014 | 135 | key, |
ffe60014 | 136 | channel->name, |
ffe60014 DG |
137 | channel->relayd_id, |
138 | channel->session_id, | |
d2956687 | 139 | channel->trace_chunk, |
ffe60014 DG |
140 | cpu, |
141 | &alloc_ret, | |
4891ece8 | 142 | channel->type, |
d2956687 | 143 | channel->monitor); |
ffe60014 DG |
144 | if (stream == NULL) { |
145 | switch (alloc_ret) { | |
146 | case -ENOENT: | |
147 | /* | |
148 | * We could not find the channel. Can happen if cpu hotplug | |
149 | * happens while tearing down. | |
150 | */ | |
151 | DBG3("Could not find channel"); | |
152 | break; | |
153 | case -ENOMEM: | |
154 | case -EINVAL: | |
155 | default: | |
156 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
157 | break; | |
158 | } | |
159 | goto error; | |
160 | } | |
161 | ||
d9a2e16e | 162 | consumer_stream_update_channel_attributes(stream, channel); |
ffe60014 DG |
163 | |
164 | error: | |
165 | if (_alloc_ret) { | |
166 | *_alloc_ret = alloc_ret; | |
167 | } | |
168 | return stream; | |
169 | } | |
170 | ||
171 | /* | |
172 | * Send the given stream pointer to the corresponding thread. | |
173 | * | |
174 | * Returns 0 on success else a negative value. | |
175 | */ | |
176 | static int send_stream_to_thread(struct lttng_consumer_stream *stream, | |
177 | struct lttng_consumer_local_data *ctx) | |
178 | { | |
dae10966 DG |
179 | int ret; |
180 | struct lttng_pipe *stream_pipe; | |
ffe60014 DG |
181 | |
182 | /* Get the right pipe where the stream will be sent. */ | |
183 | if (stream->metadata_flag) { | |
66d583dc | 184 | consumer_add_metadata_stream(stream); |
dae10966 | 185 | stream_pipe = ctx->consumer_metadata_pipe; |
ffe60014 | 186 | } else { |
66d583dc | 187 | consumer_add_data_stream(stream); |
dae10966 | 188 | stream_pipe = ctx->consumer_data_pipe; |
ffe60014 DG |
189 | } |
190 | ||
5ab66908 MD |
191 | /* |
192 | * From this point on, the stream's ownership has been moved away from | |
a8086cf4 JR |
193 | * the channel and it becomes globally visible. Hence, remove it from |
194 | * the local stream list to prevent the stream from being both local and | |
195 | * global. | |
5ab66908 MD |
196 | */ |
197 | stream->globally_visible = 1; | |
a8086cf4 | 198 | cds_list_del(&stream->send_node); |
5ab66908 | 199 | |
dae10966 | 200 | ret = lttng_pipe_write(stream_pipe, &stream, sizeof(stream)); |
ffe60014 | 201 | if (ret < 0) { |
dae10966 DG |
202 | ERR("Consumer write %s stream to pipe %d", |
203 | stream->metadata_flag ? "metadata" : "data", | |
204 | lttng_pipe_get_writefd(stream_pipe)); | |
5ab66908 MD |
205 | if (stream->metadata_flag) { |
206 | consumer_del_stream_for_metadata(stream); | |
207 | } else { | |
208 | consumer_del_stream_for_data(stream); | |
209 | } | |
a8086cf4 | 210 | goto error; |
ffe60014 | 211 | } |
a8086cf4 | 212 | |
5ab66908 | 213 | error: |
ffe60014 DG |
214 | return ret; |
215 | } | |
216 | ||
4628484a MD |
217 | static |
218 | int get_stream_shm_path(char *stream_shm_path, const char *shm_path, int cpu) | |
219 | { | |
45863397 | 220 | char cpu_nr[INT_MAX_STR_LEN]; /* int max len */ |
4628484a MD |
221 | int ret; |
222 | ||
223 | strncpy(stream_shm_path, shm_path, PATH_MAX); | |
224 | stream_shm_path[PATH_MAX - 1] = '\0'; | |
45863397 | 225 | ret = snprintf(cpu_nr, INT_MAX_STR_LEN, "%i", cpu); |
67f8cb8d MD |
226 | if (ret < 0) { |
227 | PERROR("snprintf"); | |
4628484a MD |
228 | goto end; |
229 | } | |
230 | strncat(stream_shm_path, cpu_nr, | |
231 | PATH_MAX - strlen(stream_shm_path) - 1); | |
232 | ret = 0; | |
233 | end: | |
234 | return ret; | |
235 | } | |
236 | ||
d88aee68 DG |
237 | /* |
238 | * Create streams for the given channel using liblttng-ust-ctl. | |
d2956687 | 239 | * The channel lock must be acquired by the caller. |
d88aee68 DG |
240 | * |
241 | * Return 0 on success else a negative value. | |
242 | */ | |
ffe60014 | 243 | static int create_ust_streams(struct lttng_consumer_channel *channel, |
d2956687 | 244 | struct lttng_consumer_local_data *ctx) |
ffe60014 DG |
245 | { |
246 | int ret, cpu = 0; | |
247 | struct ustctl_consumer_stream *ustream; | |
248 | struct lttng_consumer_stream *stream; | |
d2956687 | 249 | pthread_mutex_t *current_stream_lock = NULL; |
ffe60014 DG |
250 | |
251 | assert(channel); | |
252 | assert(ctx); | |
253 | ||
254 | /* | |
255 | * While a stream is available from ustctl. When NULL is returned, we've | |
256 | * reached the end of the possible stream for the channel. | |
257 | */ | |
258 | while ((ustream = ustctl_create_stream(channel->uchan, cpu))) { | |
259 | int wait_fd; | |
04ef1097 | 260 | int ust_metadata_pipe[2]; |
ffe60014 | 261 | |
9ce5646a MD |
262 | health_code_update(); |
263 | ||
04ef1097 MD |
264 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && channel->monitor) { |
265 | ret = utils_create_pipe_cloexec_nonblock(ust_metadata_pipe); | |
266 | if (ret < 0) { | |
267 | ERR("Create ust metadata poll pipe"); | |
268 | goto error; | |
269 | } | |
270 | wait_fd = ust_metadata_pipe[0]; | |
271 | } else { | |
272 | wait_fd = ustctl_stream_get_wait_fd(ustream); | |
273 | } | |
ffe60014 DG |
274 | |
275 | /* Allocate consumer stream object. */ | |
d2956687 | 276 | stream = allocate_stream(cpu, wait_fd, channel, ctx, &ret); |
ffe60014 DG |
277 | if (!stream) { |
278 | goto error_alloc; | |
279 | } | |
280 | stream->ustream = ustream; | |
281 | /* | |
282 | * Store it so we can save multiple function calls afterwards since | |
283 | * this value is used heavily in the stream threads. This is UST | |
284 | * specific so this is why it's done after allocation. | |
285 | */ | |
286 | stream->wait_fd = wait_fd; | |
287 | ||
b31398bb DG |
288 | /* |
289 | * Increment channel refcount since the channel reference has now been | |
290 | * assigned in the allocation process above. | |
291 | */ | |
10a50311 JD |
292 | if (stream->chan->monitor) { |
293 | uatomic_inc(&stream->chan->refcount); | |
294 | } | |
b31398bb | 295 | |
d2956687 JG |
296 | pthread_mutex_lock(&stream->lock); |
297 | current_stream_lock = &stream->lock; | |
ffe60014 DG |
298 | /* |
299 | * Order is important this is why a list is used. On error, the caller | |
300 | * should clean this list. | |
301 | */ | |
302 | cds_list_add_tail(&stream->send_node, &channel->streams.head); | |
303 | ||
304 | ret = ustctl_get_max_subbuf_size(stream->ustream, | |
305 | &stream->max_sb_size); | |
306 | if (ret < 0) { | |
307 | ERR("ustctl_get_max_subbuf_size failed for stream %s", | |
308 | stream->name); | |
309 | goto error; | |
310 | } | |
311 | ||
312 | /* Do actions once stream has been received. */ | |
313 | if (ctx->on_recv_stream) { | |
314 | ret = ctx->on_recv_stream(stream); | |
315 | if (ret < 0) { | |
316 | goto error; | |
317 | } | |
318 | } | |
319 | ||
d88aee68 | 320 | DBG("UST consumer add stream %s (key: %" PRIu64 ") with relayd id %" PRIu64, |
ffe60014 DG |
321 | stream->name, stream->key, stream->relayd_stream_id); |
322 | ||
323 | /* Set next CPU stream. */ | |
324 | channel->streams.count = ++cpu; | |
d88aee68 DG |
325 | |
326 | /* Keep stream reference when creating metadata. */ | |
327 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) { | |
328 | channel->metadata_stream = stream; | |
8de4f941 JG |
329 | if (channel->monitor) { |
330 | /* Set metadata poll pipe if we created one */ | |
331 | memcpy(stream->ust_metadata_poll_pipe, | |
332 | ust_metadata_pipe, | |
333 | sizeof(ust_metadata_pipe)); | |
334 | } | |
d88aee68 | 335 | } |
d2956687 JG |
336 | pthread_mutex_unlock(&stream->lock); |
337 | current_stream_lock = NULL; | |
ffe60014 DG |
338 | } |
339 | ||
340 | return 0; | |
341 | ||
342 | error: | |
343 | error_alloc: | |
d2956687 JG |
344 | if (current_stream_lock) { |
345 | pthread_mutex_unlock(current_stream_lock); | |
346 | } | |
ffe60014 DG |
347 | return ret; |
348 | } | |
349 | ||
4628484a MD |
350 | /* |
351 | * create_posix_shm is never called concurrently within a process. | |
352 | */ | |
353 | static | |
354 | int create_posix_shm(void) | |
355 | { | |
356 | char tmp_name[NAME_MAX]; | |
357 | int shmfd, ret; | |
358 | ||
359 | ret = snprintf(tmp_name, NAME_MAX, "/ust-shm-consumer-%d", getpid()); | |
360 | if (ret < 0) { | |
361 | PERROR("snprintf"); | |
362 | return -1; | |
363 | } | |
364 | /* | |
365 | * Allocate shm, and immediately unlink its shm oject, keeping | |
366 | * only the file descriptor as a reference to the object. | |
367 | * We specifically do _not_ use the / at the beginning of the | |
368 | * pathname so that some OS implementations can keep it local to | |
369 | * the process (POSIX leaves this implementation-defined). | |
370 | */ | |
371 | shmfd = shm_open(tmp_name, O_CREAT | O_EXCL | O_RDWR, 0700); | |
372 | if (shmfd < 0) { | |
373 | PERROR("shm_open"); | |
374 | goto error_shm_open; | |
375 | } | |
376 | ret = shm_unlink(tmp_name); | |
377 | if (ret < 0 && errno != ENOENT) { | |
378 | PERROR("shm_unlink"); | |
379 | goto error_shm_release; | |
380 | } | |
381 | return shmfd; | |
382 | ||
383 | error_shm_release: | |
384 | ret = close(shmfd); | |
385 | if (ret) { | |
386 | PERROR("close"); | |
387 | } | |
388 | error_shm_open: | |
389 | return -1; | |
390 | } | |
391 | ||
d2956687 JG |
392 | static int open_ust_stream_fd(struct lttng_consumer_channel *channel, int cpu, |
393 | const struct lttng_credentials *session_credentials) | |
4628484a MD |
394 | { |
395 | char shm_path[PATH_MAX]; | |
396 | int ret; | |
397 | ||
398 | if (!channel->shm_path[0]) { | |
399 | return create_posix_shm(); | |
400 | } | |
401 | ret = get_stream_shm_path(shm_path, channel->shm_path, cpu); | |
402 | if (ret) { | |
403 | goto error_shm_path; | |
404 | } | |
405 | return run_as_open(shm_path, | |
406 | O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR, | |
d2956687 | 407 | session_credentials->uid, session_credentials->gid); |
4628484a MD |
408 | |
409 | error_shm_path: | |
410 | return -1; | |
411 | } | |
412 | ||
ffe60014 DG |
413 | /* |
414 | * Create an UST channel with the given attributes and send it to the session | |
415 | * daemon using the ust ctl API. | |
416 | * | |
417 | * Return 0 on success or else a negative value. | |
418 | */ | |
4628484a MD |
419 | static int create_ust_channel(struct lttng_consumer_channel *channel, |
420 | struct ustctl_consumer_channel_attr *attr, | |
421 | struct ustctl_consumer_channel **ust_chanp) | |
ffe60014 | 422 | { |
4628484a MD |
423 | int ret, nr_stream_fds, i, j; |
424 | int *stream_fds; | |
425 | struct ustctl_consumer_channel *ust_channel; | |
ffe60014 | 426 | |
4628484a | 427 | assert(channel); |
ffe60014 | 428 | assert(attr); |
4628484a | 429 | assert(ust_chanp); |
d2956687 | 430 | assert(channel->buffer_credentials.is_set); |
ffe60014 DG |
431 | |
432 | DBG3("Creating channel to ustctl with attr: [overwrite: %d, " | |
433 | "subbuf_size: %" PRIu64 ", num_subbuf: %" PRIu64 ", " | |
434 | "switch_timer_interval: %u, read_timer_interval: %u, " | |
435 | "output: %d, type: %d", attr->overwrite, attr->subbuf_size, | |
436 | attr->num_subbuf, attr->switch_timer_interval, | |
437 | attr->read_timer_interval, attr->output, attr->type); | |
438 | ||
4628484a MD |
439 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) |
440 | nr_stream_fds = 1; | |
441 | else | |
442 | nr_stream_fds = ustctl_get_nr_stream_per_channel(); | |
443 | stream_fds = zmalloc(nr_stream_fds * sizeof(*stream_fds)); | |
444 | if (!stream_fds) { | |
445 | ret = -1; | |
446 | goto error_alloc; | |
447 | } | |
448 | for (i = 0; i < nr_stream_fds; i++) { | |
d2956687 JG |
449 | stream_fds[i] = open_ust_stream_fd(channel, i, |
450 | &channel->buffer_credentials.value); | |
4628484a MD |
451 | if (stream_fds[i] < 0) { |
452 | ret = -1; | |
453 | goto error_open; | |
454 | } | |
455 | } | |
456 | ust_channel = ustctl_create_channel(attr, stream_fds, nr_stream_fds); | |
457 | if (!ust_channel) { | |
ffe60014 DG |
458 | ret = -1; |
459 | goto error_create; | |
460 | } | |
4628484a MD |
461 | channel->nr_stream_fds = nr_stream_fds; |
462 | channel->stream_fds = stream_fds; | |
463 | *ust_chanp = ust_channel; | |
ffe60014 DG |
464 | |
465 | return 0; | |
466 | ||
467 | error_create: | |
4628484a MD |
468 | error_open: |
469 | for (j = i - 1; j >= 0; j--) { | |
470 | int closeret; | |
471 | ||
472 | closeret = close(stream_fds[j]); | |
473 | if (closeret) { | |
474 | PERROR("close"); | |
475 | } | |
476 | if (channel->shm_path[0]) { | |
477 | char shm_path[PATH_MAX]; | |
478 | ||
479 | closeret = get_stream_shm_path(shm_path, | |
480 | channel->shm_path, j); | |
481 | if (closeret) { | |
482 | ERR("Cannot get stream shm path"); | |
483 | } | |
484 | closeret = run_as_unlink(shm_path, | |
d2956687 JG |
485 | channel->buffer_credentials.value.uid, |
486 | channel->buffer_credentials.value.gid); | |
4628484a | 487 | if (closeret) { |
4628484a MD |
488 | PERROR("unlink %s", shm_path); |
489 | } | |
490 | } | |
491 | } | |
492 | /* Try to rmdir all directories under shm_path root. */ | |
493 | if (channel->root_shm_path[0]) { | |
602766ec | 494 | (void) run_as_rmdir_recursive(channel->root_shm_path, |
d2956687 | 495 | channel->buffer_credentials.value.uid, |
f75c5439 MD |
496 | channel->buffer_credentials.value.gid, |
497 | LTTNG_DIRECTORY_HANDLE_SKIP_NON_EMPTY_FLAG); | |
4628484a MD |
498 | } |
499 | free(stream_fds); | |
500 | error_alloc: | |
ffe60014 DG |
501 | return ret; |
502 | } | |
503 | ||
d88aee68 DG |
504 | /* |
505 | * Send a single given stream to the session daemon using the sock. | |
506 | * | |
507 | * Return 0 on success else a negative value. | |
508 | */ | |
ffe60014 DG |
509 | static int send_sessiond_stream(int sock, struct lttng_consumer_stream *stream) |
510 | { | |
511 | int ret; | |
512 | ||
513 | assert(stream); | |
514 | assert(sock >= 0); | |
515 | ||
3eb914c0 | 516 | DBG("UST consumer sending stream %" PRIu64 " to sessiond", stream->key); |
ffe60014 DG |
517 | |
518 | /* Send stream to session daemon. */ | |
519 | ret = ustctl_send_stream_to_sessiond(sock, stream->ustream); | |
520 | if (ret < 0) { | |
521 | goto error; | |
522 | } | |
523 | ||
ffe60014 DG |
524 | error: |
525 | return ret; | |
526 | } | |
527 | ||
528 | /* | |
a3a86f35 | 529 | * Send channel to sessiond and relayd if applicable. |
ffe60014 | 530 | * |
d88aee68 | 531 | * Return 0 on success or else a negative value. |
ffe60014 | 532 | */ |
a3a86f35 | 533 | static int send_channel_to_sessiond_and_relayd(int sock, |
ffe60014 DG |
534 | struct lttng_consumer_channel *channel, |
535 | struct lttng_consumer_local_data *ctx, int *relayd_error) | |
536 | { | |
0c759fc9 | 537 | int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
ffe60014 | 538 | struct lttng_consumer_stream *stream; |
a4baae1b | 539 | uint64_t net_seq_idx = -1ULL; |
ffe60014 DG |
540 | |
541 | assert(channel); | |
542 | assert(ctx); | |
543 | assert(sock >= 0); | |
544 | ||
545 | DBG("UST consumer sending channel %s to sessiond", channel->name); | |
546 | ||
62285ea4 DG |
547 | if (channel->relayd_id != (uint64_t) -1ULL) { |
548 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
549 | |
550 | health_code_update(); | |
551 | ||
62285ea4 | 552 | /* Try to send the stream to the relayd if one is available. */ |
a3a86f35 JG |
553 | DBG("Sending stream %" PRIu64 " of channel \"%s\" to relayd", |
554 | stream->key, channel->name); | |
62285ea4 DG |
555 | ret = consumer_send_relayd_stream(stream, stream->chan->pathname); |
556 | if (ret < 0) { | |
557 | /* | |
558 | * Flag that the relayd was the problem here probably due to a | |
559 | * communicaton error on the socket. | |
560 | */ | |
561 | if (relayd_error) { | |
562 | *relayd_error = 1; | |
563 | } | |
725d28b2 | 564 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
ffe60014 | 565 | } |
a4baae1b JD |
566 | if (net_seq_idx == -1ULL) { |
567 | net_seq_idx = stream->net_seq_idx; | |
568 | } | |
569 | } | |
f2a444f1 | 570 | } |
ffe60014 | 571 | |
f2a444f1 DG |
572 | /* Inform sessiond that we are about to send channel and streams. */ |
573 | ret = consumer_send_status_msg(sock, ret_code); | |
0c759fc9 | 574 | if (ret < 0 || ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
f2a444f1 DG |
575 | /* |
576 | * Either the session daemon is not responding or the relayd died so we | |
577 | * stop now. | |
578 | */ | |
579 | goto error; | |
580 | } | |
581 | ||
582 | /* Send channel to sessiond. */ | |
583 | ret = ustctl_send_channel_to_sessiond(sock, channel->uchan); | |
584 | if (ret < 0) { | |
585 | goto error; | |
586 | } | |
587 | ||
588 | ret = ustctl_channel_close_wakeup_fd(channel->uchan); | |
589 | if (ret < 0) { | |
590 | goto error; | |
591 | } | |
592 | ||
593 | /* The channel was sent successfully to the sessiond at this point. */ | |
594 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
595 | |
596 | health_code_update(); | |
597 | ||
ffe60014 DG |
598 | /* Send stream to session daemon. */ |
599 | ret = send_sessiond_stream(sock, stream); | |
600 | if (ret < 0) { | |
601 | goto error; | |
602 | } | |
603 | } | |
604 | ||
605 | /* Tell sessiond there is no more stream. */ | |
606 | ret = ustctl_send_stream_to_sessiond(sock, NULL); | |
607 | if (ret < 0) { | |
608 | goto error; | |
609 | } | |
610 | ||
611 | DBG("UST consumer NULL stream sent to sessiond"); | |
612 | ||
613 | return 0; | |
614 | ||
615 | error: | |
0c759fc9 | 616 | if (ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
f2a444f1 DG |
617 | ret = -1; |
618 | } | |
ffe60014 DG |
619 | return ret; |
620 | } | |
621 | ||
622 | /* | |
623 | * Creates a channel and streams and add the channel it to the channel internal | |
624 | * state. The created stream must ONLY be sent once the GET_CHANNEL command is | |
625 | * received. | |
626 | * | |
627 | * Return 0 on success or else, a negative value is returned and the channel | |
628 | * MUST be destroyed by consumer_del_channel(). | |
629 | */ | |
75cfe9e6 | 630 | static int ask_channel(struct lttng_consumer_local_data *ctx, |
ffe60014 | 631 | struct lttng_consumer_channel *channel, |
d2956687 | 632 | struct ustctl_consumer_channel_attr *attr) |
3bd1e081 MD |
633 | { |
634 | int ret; | |
635 | ||
ffe60014 DG |
636 | assert(ctx); |
637 | assert(channel); | |
638 | assert(attr); | |
639 | ||
640 | /* | |
641 | * This value is still used by the kernel consumer since for the kernel, | |
642 | * the stream ownership is not IN the consumer so we need to have the | |
643 | * number of left stream that needs to be initialized so we can know when | |
644 | * to delete the channel (see consumer.c). | |
645 | * | |
646 | * As for the user space tracer now, the consumer creates and sends the | |
647 | * stream to the session daemon which only sends them to the application | |
648 | * once every stream of a channel is received making this value useless | |
649 | * because we they will be added to the poll thread before the application | |
650 | * receives them. This ensures that a stream can not hang up during | |
651 | * initilization of a channel. | |
652 | */ | |
653 | channel->nb_init_stream_left = 0; | |
654 | ||
655 | /* The reply msg status is handled in the following call. */ | |
4628484a | 656 | ret = create_ust_channel(channel, attr, &channel->uchan); |
ffe60014 | 657 | if (ret < 0) { |
10a50311 | 658 | goto end; |
3bd1e081 MD |
659 | } |
660 | ||
d8ef542d MD |
661 | channel->wait_fd = ustctl_channel_get_wait_fd(channel->uchan); |
662 | ||
10a50311 JD |
663 | /* |
664 | * For the snapshots (no monitor), we create the metadata streams | |
665 | * on demand, not during the channel creation. | |
666 | */ | |
667 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && !channel->monitor) { | |
668 | ret = 0; | |
669 | goto end; | |
670 | } | |
671 | ||
ffe60014 | 672 | /* Open all streams for this channel. */ |
d2956687 JG |
673 | pthread_mutex_lock(&channel->lock); |
674 | ret = create_ust_streams(channel, ctx); | |
675 | pthread_mutex_unlock(&channel->lock); | |
ffe60014 | 676 | if (ret < 0) { |
10a50311 | 677 | goto end; |
ffe60014 DG |
678 | } |
679 | ||
10a50311 | 680 | end: |
3bd1e081 MD |
681 | return ret; |
682 | } | |
683 | ||
d88aee68 DG |
684 | /* |
685 | * Send all stream of a channel to the right thread handling it. | |
686 | * | |
687 | * On error, return a negative value else 0 on success. | |
688 | */ | |
689 | static int send_streams_to_thread(struct lttng_consumer_channel *channel, | |
690 | struct lttng_consumer_local_data *ctx) | |
691 | { | |
692 | int ret = 0; | |
693 | struct lttng_consumer_stream *stream, *stmp; | |
694 | ||
695 | assert(channel); | |
696 | assert(ctx); | |
697 | ||
698 | /* Send streams to the corresponding thread. */ | |
699 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
700 | send_node) { | |
9ce5646a MD |
701 | |
702 | health_code_update(); | |
703 | ||
d88aee68 DG |
704 | /* Sending the stream to the thread. */ |
705 | ret = send_stream_to_thread(stream, ctx); | |
706 | if (ret < 0) { | |
707 | /* | |
708 | * If we are unable to send the stream to the thread, there is | |
709 | * a big problem so just stop everything. | |
710 | */ | |
711 | goto error; | |
712 | } | |
d88aee68 DG |
713 | } |
714 | ||
715 | error: | |
716 | return ret; | |
717 | } | |
718 | ||
7972aab2 DG |
719 | /* |
720 | * Flush channel's streams using the given key to retrieve the channel. | |
721 | * | |
722 | * Return 0 on success else an LTTng error code. | |
723 | */ | |
724 | static int flush_channel(uint64_t chan_key) | |
725 | { | |
726 | int ret = 0; | |
727 | struct lttng_consumer_channel *channel; | |
728 | struct lttng_consumer_stream *stream; | |
729 | struct lttng_ht *ht; | |
730 | struct lttng_ht_iter iter; | |
731 | ||
8fd623e0 | 732 | DBG("UST consumer flush channel key %" PRIu64, chan_key); |
7972aab2 | 733 | |
a500c257 | 734 | rcu_read_lock(); |
7972aab2 DG |
735 | channel = consumer_find_channel(chan_key); |
736 | if (!channel) { | |
8fd623e0 | 737 | ERR("UST consumer flush channel %" PRIu64 " not found", chan_key); |
7972aab2 DG |
738 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
739 | goto error; | |
740 | } | |
741 | ||
742 | ht = consumer_data.stream_per_chan_id_ht; | |
743 | ||
744 | /* For each stream of the channel id, flush it. */ | |
7972aab2 DG |
745 | cds_lfht_for_each_entry_duplicate(ht->ht, |
746 | ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct, | |
747 | &channel->key, &iter.iter, stream, node_channel_id.node) { | |
9ce5646a MD |
748 | |
749 | health_code_update(); | |
750 | ||
0dd01979 | 751 | pthread_mutex_lock(&stream->lock); |
5cfcab67 JR |
752 | |
753 | /* | |
754 | * Protect against concurrent teardown of a stream. | |
755 | */ | |
756 | if (cds_lfht_is_node_deleted(&stream->node.node)) { | |
757 | goto next; | |
758 | } | |
759 | ||
0dd01979 MD |
760 | if (!stream->quiescent) { |
761 | ustctl_flush_buffer(stream->ustream, 0); | |
762 | stream->quiescent = true; | |
763 | } | |
5cfcab67 | 764 | next: |
0dd01979 MD |
765 | pthread_mutex_unlock(&stream->lock); |
766 | } | |
767 | error: | |
768 | rcu_read_unlock(); | |
769 | return ret; | |
770 | } | |
771 | ||
772 | /* | |
773 | * Clear quiescent state from channel's streams using the given key to | |
774 | * retrieve the channel. | |
775 | * | |
776 | * Return 0 on success else an LTTng error code. | |
777 | */ | |
778 | static int clear_quiescent_channel(uint64_t chan_key) | |
779 | { | |
780 | int ret = 0; | |
781 | struct lttng_consumer_channel *channel; | |
782 | struct lttng_consumer_stream *stream; | |
783 | struct lttng_ht *ht; | |
784 | struct lttng_ht_iter iter; | |
785 | ||
786 | DBG("UST consumer clear quiescent channel key %" PRIu64, chan_key); | |
787 | ||
788 | rcu_read_lock(); | |
789 | channel = consumer_find_channel(chan_key); | |
790 | if (!channel) { | |
791 | ERR("UST consumer clear quiescent channel %" PRIu64 " not found", chan_key); | |
792 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
793 | goto error; | |
794 | } | |
795 | ||
796 | ht = consumer_data.stream_per_chan_id_ht; | |
797 | ||
798 | /* For each stream of the channel id, clear quiescent state. */ | |
799 | cds_lfht_for_each_entry_duplicate(ht->ht, | |
800 | ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct, | |
801 | &channel->key, &iter.iter, stream, node_channel_id.node) { | |
802 | ||
803 | health_code_update(); | |
804 | ||
805 | pthread_mutex_lock(&stream->lock); | |
806 | stream->quiescent = false; | |
807 | pthread_mutex_unlock(&stream->lock); | |
7972aab2 | 808 | } |
7972aab2 | 809 | error: |
a500c257 | 810 | rcu_read_unlock(); |
7972aab2 DG |
811 | return ret; |
812 | } | |
813 | ||
d88aee68 DG |
814 | /* |
815 | * Close metadata stream wakeup_fd using the given key to retrieve the channel. | |
816 | * | |
817 | * Return 0 on success else an LTTng error code. | |
818 | */ | |
819 | static int close_metadata(uint64_t chan_key) | |
820 | { | |
ea88ca2a | 821 | int ret = 0; |
d88aee68 | 822 | struct lttng_consumer_channel *channel; |
f65a74be | 823 | unsigned int channel_monitor; |
d88aee68 | 824 | |
8fd623e0 | 825 | DBG("UST consumer close metadata key %" PRIu64, chan_key); |
d88aee68 DG |
826 | |
827 | channel = consumer_find_channel(chan_key); | |
828 | if (!channel) { | |
84cc9aa0 DG |
829 | /* |
830 | * This is possible if the metadata thread has issue a delete because | |
831 | * the endpoint point of the stream hung up. There is no way the | |
832 | * session daemon can know about it thus use a DBG instead of an actual | |
833 | * error. | |
834 | */ | |
835 | DBG("UST consumer close metadata %" PRIu64 " not found", chan_key); | |
d88aee68 DG |
836 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
837 | goto error; | |
838 | } | |
839 | ||
ea88ca2a | 840 | pthread_mutex_lock(&consumer_data.lock); |
a9838785 | 841 | pthread_mutex_lock(&channel->lock); |
f65a74be | 842 | channel_monitor = channel->monitor; |
73811ecc DG |
843 | if (cds_lfht_is_node_deleted(&channel->node.node)) { |
844 | goto error_unlock; | |
845 | } | |
846 | ||
6d574024 | 847 | lttng_ustconsumer_close_metadata(channel); |
f65a74be JG |
848 | pthread_mutex_unlock(&channel->lock); |
849 | pthread_mutex_unlock(&consumer_data.lock); | |
d88aee68 | 850 | |
f65a74be JG |
851 | /* |
852 | * The ownership of a metadata channel depends on the type of | |
853 | * session to which it belongs. In effect, the monitor flag is checked | |
854 | * to determine if this metadata channel is in "snapshot" mode or not. | |
855 | * | |
856 | * In the non-snapshot case, the metadata channel is created along with | |
857 | * a single stream which will remain present until the metadata channel | |
858 | * is destroyed (on the destruction of its session). In this case, the | |
859 | * metadata stream in "monitored" by the metadata poll thread and holds | |
860 | * the ownership of its channel. | |
861 | * | |
862 | * Closing the metadata will cause the metadata stream's "metadata poll | |
863 | * pipe" to be closed. Closing this pipe will wake-up the metadata poll | |
864 | * thread which will teardown the metadata stream which, in return, | |
865 | * deletes the metadata channel. | |
866 | * | |
867 | * In the snapshot case, the metadata stream is created and destroyed | |
868 | * on every snapshot record. Since the channel doesn't have an owner | |
869 | * other than the session daemon, it is safe to destroy it immediately | |
870 | * on reception of the CLOSE_METADATA command. | |
871 | */ | |
872 | if (!channel_monitor) { | |
873 | /* | |
874 | * The channel and consumer_data locks must be | |
875 | * released before this call since consumer_del_channel | |
876 | * re-acquires the channel and consumer_data locks to teardown | |
877 | * the channel and queue its reclamation by the "call_rcu" | |
878 | * worker thread. | |
879 | */ | |
880 | consumer_del_channel(channel); | |
881 | } | |
882 | ||
883 | return ret; | |
ea88ca2a | 884 | error_unlock: |
a9838785 | 885 | pthread_mutex_unlock(&channel->lock); |
ea88ca2a | 886 | pthread_mutex_unlock(&consumer_data.lock); |
d88aee68 DG |
887 | error: |
888 | return ret; | |
889 | } | |
890 | ||
891 | /* | |
892 | * RCU read side lock MUST be acquired before calling this function. | |
893 | * | |
894 | * Return 0 on success else an LTTng error code. | |
895 | */ | |
896 | static int setup_metadata(struct lttng_consumer_local_data *ctx, uint64_t key) | |
897 | { | |
898 | int ret; | |
899 | struct lttng_consumer_channel *metadata; | |
900 | ||
8fd623e0 | 901 | DBG("UST consumer setup metadata key %" PRIu64, key); |
d88aee68 DG |
902 | |
903 | metadata = consumer_find_channel(key); | |
904 | if (!metadata) { | |
905 | ERR("UST consumer push metadata %" PRIu64 " not found", key); | |
906 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
10a50311 JD |
907 | goto end; |
908 | } | |
909 | ||
910 | /* | |
911 | * In no monitor mode, the metadata channel has no stream(s) so skip the | |
912 | * ownership transfer to the metadata thread. | |
913 | */ | |
914 | if (!metadata->monitor) { | |
915 | DBG("Metadata channel in no monitor"); | |
916 | ret = 0; | |
917 | goto end; | |
d88aee68 DG |
918 | } |
919 | ||
920 | /* | |
921 | * Send metadata stream to relayd if one available. Availability is | |
922 | * known if the stream is still in the list of the channel. | |
923 | */ | |
924 | if (cds_list_empty(&metadata->streams.head)) { | |
925 | ERR("Metadata channel key %" PRIu64 ", no stream available.", key); | |
926 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
f5a0c9cf | 927 | goto error_no_stream; |
d88aee68 DG |
928 | } |
929 | ||
930 | /* Send metadata stream to relayd if needed. */ | |
62285ea4 DG |
931 | if (metadata->metadata_stream->net_seq_idx != (uint64_t) -1ULL) { |
932 | ret = consumer_send_relayd_stream(metadata->metadata_stream, | |
933 | metadata->pathname); | |
934 | if (ret < 0) { | |
935 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
936 | goto error; | |
937 | } | |
601262d6 JD |
938 | ret = consumer_send_relayd_streams_sent( |
939 | metadata->metadata_stream->net_seq_idx); | |
940 | if (ret < 0) { | |
941 | ret = LTTCOMM_CONSUMERD_RELAYD_FAIL; | |
942 | goto error; | |
943 | } | |
d88aee68 DG |
944 | } |
945 | ||
a8086cf4 JR |
946 | /* |
947 | * Ownership of metadata stream is passed along. Freeing is handled by | |
948 | * the callee. | |
949 | */ | |
d88aee68 DG |
950 | ret = send_streams_to_thread(metadata, ctx); |
951 | if (ret < 0) { | |
952 | /* | |
953 | * If we are unable to send the stream to the thread, there is | |
954 | * a big problem so just stop everything. | |
955 | */ | |
956 | ret = LTTCOMM_CONSUMERD_FATAL; | |
a8086cf4 | 957 | goto send_streams_error; |
d88aee68 DG |
958 | } |
959 | /* List MUST be empty after or else it could be reused. */ | |
960 | assert(cds_list_empty(&metadata->streams.head)); | |
961 | ||
10a50311 JD |
962 | ret = 0; |
963 | goto end; | |
d88aee68 DG |
964 | |
965 | error: | |
f2a444f1 DG |
966 | /* |
967 | * Delete metadata channel on error. At this point, the metadata stream can | |
968 | * NOT be monitored by the metadata thread thus having the guarantee that | |
969 | * the stream is still in the local stream list of the channel. This call | |
970 | * will make sure to clean that list. | |
971 | */ | |
f5a0c9cf | 972 | consumer_stream_destroy(metadata->metadata_stream, NULL); |
212d67a2 DG |
973 | cds_list_del(&metadata->metadata_stream->send_node); |
974 | metadata->metadata_stream = NULL; | |
a8086cf4 | 975 | send_streams_error: |
f5a0c9cf | 976 | error_no_stream: |
10a50311 JD |
977 | end: |
978 | return ret; | |
979 | } | |
980 | ||
981 | /* | |
982 | * Snapshot the whole metadata. | |
d2956687 | 983 | * RCU read-side lock must be held by the caller. |
10a50311 JD |
984 | * |
985 | * Returns 0 on success, < 0 on error | |
986 | */ | |
3eb928aa MD |
987 | static int snapshot_metadata(struct lttng_consumer_channel *metadata_channel, |
988 | uint64_t key, char *path, uint64_t relayd_id, | |
d2956687 | 989 | struct lttng_consumer_local_data *ctx) |
10a50311 JD |
990 | { |
991 | int ret = 0; | |
10a50311 JD |
992 | struct lttng_consumer_stream *metadata_stream; |
993 | ||
994 | assert(path); | |
995 | assert(ctx); | |
996 | ||
997 | DBG("UST consumer snapshot metadata with key %" PRIu64 " at path %s", | |
998 | key, path); | |
999 | ||
1000 | rcu_read_lock(); | |
1001 | ||
10a50311 JD |
1002 | assert(!metadata_channel->monitor); |
1003 | ||
9ce5646a MD |
1004 | health_code_update(); |
1005 | ||
10a50311 JD |
1006 | /* |
1007 | * Ask the sessiond if we have new metadata waiting and update the | |
1008 | * consumer metadata cache. | |
1009 | */ | |
94d49140 | 1010 | ret = lttng_ustconsumer_request_metadata(ctx, metadata_channel, 0, 1); |
10a50311 JD |
1011 | if (ret < 0) { |
1012 | goto error; | |
1013 | } | |
1014 | ||
9ce5646a MD |
1015 | health_code_update(); |
1016 | ||
10a50311 JD |
1017 | /* |
1018 | * The metadata stream is NOT created in no monitor mode when the channel | |
1019 | * is created on a sessiond ask channel command. | |
1020 | */ | |
d2956687 | 1021 | ret = create_ust_streams(metadata_channel, ctx); |
10a50311 JD |
1022 | if (ret < 0) { |
1023 | goto error; | |
1024 | } | |
1025 | ||
1026 | metadata_stream = metadata_channel->metadata_stream; | |
1027 | assert(metadata_stream); | |
1028 | ||
d2956687 | 1029 | pthread_mutex_lock(&metadata_stream->lock); |
10a50311 JD |
1030 | if (relayd_id != (uint64_t) -1ULL) { |
1031 | metadata_stream->net_seq_idx = relayd_id; | |
1032 | ret = consumer_send_relayd_stream(metadata_stream, path); | |
10a50311 | 1033 | } else { |
d2956687 JG |
1034 | ret = consumer_stream_create_output_files(metadata_stream, |
1035 | false); | |
1036 | } | |
1037 | pthread_mutex_unlock(&metadata_stream->lock); | |
1038 | if (ret < 0) { | |
1039 | goto error_stream; | |
10a50311 JD |
1040 | } |
1041 | ||
04ef1097 | 1042 | do { |
9ce5646a MD |
1043 | health_code_update(); |
1044 | ||
6f9449c2 | 1045 | ret = lttng_consumer_read_subbuffer(metadata_stream, ctx, true); |
10a50311 | 1046 | if (ret < 0) { |
94d49140 | 1047 | goto error_stream; |
10a50311 | 1048 | } |
04ef1097 | 1049 | } while (ret > 0); |
10a50311 | 1050 | |
10a50311 JD |
1051 | error_stream: |
1052 | /* | |
1053 | * Clean up the stream completly because the next snapshot will use a new | |
1054 | * metadata stream. | |
1055 | */ | |
10a50311 | 1056 | consumer_stream_destroy(metadata_stream, NULL); |
212d67a2 | 1057 | cds_list_del(&metadata_stream->send_node); |
10a50311 JD |
1058 | metadata_channel->metadata_stream = NULL; |
1059 | ||
1060 | error: | |
1061 | rcu_read_unlock(); | |
1062 | return ret; | |
1063 | } | |
1064 | ||
128708c3 JG |
1065 | static |
1066 | int get_current_subbuf_addr(struct lttng_consumer_stream *stream, | |
1067 | const char **addr) | |
1068 | { | |
1069 | int ret; | |
1070 | unsigned long mmap_offset; | |
1071 | const char *mmap_base; | |
1072 | ||
1073 | mmap_base = ustctl_get_mmap_base(stream->ustream); | |
1074 | if (!mmap_base) { | |
1075 | ERR("Failed to get mmap base for stream `%s`", | |
1076 | stream->name); | |
1077 | ret = -EPERM; | |
1078 | goto error; | |
1079 | } | |
1080 | ||
1081 | ret = ustctl_get_mmap_read_offset(stream->ustream, &mmap_offset); | |
1082 | if (ret != 0) { | |
1083 | ERR("Failed to get mmap offset for stream `%s`", stream->name); | |
1084 | ret = -EINVAL; | |
1085 | goto error; | |
1086 | } | |
1087 | ||
1088 | *addr = mmap_base + mmap_offset; | |
1089 | error: | |
1090 | return ret; | |
1091 | ||
1092 | } | |
1093 | ||
10a50311 JD |
1094 | /* |
1095 | * Take a snapshot of all the stream of a channel. | |
d2956687 | 1096 | * RCU read-side lock and the channel lock must be held by the caller. |
10a50311 JD |
1097 | * |
1098 | * Returns 0 on success, < 0 on error | |
1099 | */ | |
3eb928aa MD |
1100 | static int snapshot_channel(struct lttng_consumer_channel *channel, |
1101 | uint64_t key, char *path, uint64_t relayd_id, | |
e098433c JG |
1102 | uint64_t nb_packets_per_stream, |
1103 | struct lttng_consumer_local_data *ctx) | |
10a50311 JD |
1104 | { |
1105 | int ret; | |
1106 | unsigned use_relayd = 0; | |
1107 | unsigned long consumed_pos, produced_pos; | |
10a50311 JD |
1108 | struct lttng_consumer_stream *stream; |
1109 | ||
1110 | assert(path); | |
1111 | assert(ctx); | |
1112 | ||
1113 | rcu_read_lock(); | |
1114 | ||
1115 | if (relayd_id != (uint64_t) -1ULL) { | |
1116 | use_relayd = 1; | |
1117 | } | |
1118 | ||
10a50311 | 1119 | assert(!channel->monitor); |
6a00837f | 1120 | DBG("UST consumer snapshot channel %" PRIu64, key); |
10a50311 JD |
1121 | |
1122 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
1123 | health_code_update(); |
1124 | ||
10a50311 JD |
1125 | /* Lock stream because we are about to change its state. */ |
1126 | pthread_mutex_lock(&stream->lock); | |
d2956687 JG |
1127 | assert(channel->trace_chunk); |
1128 | if (!lttng_trace_chunk_get(channel->trace_chunk)) { | |
1129 | /* | |
1130 | * Can't happen barring an internal error as the channel | |
1131 | * holds a reference to the trace chunk. | |
1132 | */ | |
1133 | ERR("Failed to acquire reference to channel's trace chunk"); | |
1134 | ret = -1; | |
1135 | goto error_unlock; | |
1136 | } | |
1137 | assert(!stream->trace_chunk); | |
1138 | stream->trace_chunk = channel->trace_chunk; | |
1139 | ||
10a50311 JD |
1140 | stream->net_seq_idx = relayd_id; |
1141 | ||
1142 | if (use_relayd) { | |
1143 | ret = consumer_send_relayd_stream(stream, path); | |
1144 | if (ret < 0) { | |
1145 | goto error_unlock; | |
1146 | } | |
1147 | } else { | |
d2956687 JG |
1148 | ret = consumer_stream_create_output_files(stream, |
1149 | false); | |
10a50311 JD |
1150 | if (ret < 0) { |
1151 | goto error_unlock; | |
1152 | } | |
d2956687 JG |
1153 | DBG("UST consumer snapshot stream (%" PRIu64 ")", |
1154 | stream->key); | |
10a50311 JD |
1155 | } |
1156 | ||
d4d80f77 MD |
1157 | /* |
1158 | * If tracing is active, we want to perform a "full" buffer flush. | |
1159 | * Else, if quiescent, it has already been done by the prior stop. | |
1160 | */ | |
1161 | if (!stream->quiescent) { | |
1162 | ustctl_flush_buffer(stream->ustream, 0); | |
1163 | } | |
10a50311 JD |
1164 | |
1165 | ret = lttng_ustconsumer_take_snapshot(stream); | |
1166 | if (ret < 0) { | |
1167 | ERR("Taking UST snapshot"); | |
1168 | goto error_unlock; | |
1169 | } | |
1170 | ||
1171 | ret = lttng_ustconsumer_get_produced_snapshot(stream, &produced_pos); | |
1172 | if (ret < 0) { | |
1173 | ERR("Produced UST snapshot position"); | |
1174 | goto error_unlock; | |
1175 | } | |
1176 | ||
1177 | ret = lttng_ustconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
1178 | if (ret < 0) { | |
1179 | ERR("Consumerd UST snapshot position"); | |
1180 | goto error_unlock; | |
1181 | } | |
1182 | ||
5c786ded JD |
1183 | /* |
1184 | * The original value is sent back if max stream size is larger than | |
d07ceecd | 1185 | * the possible size of the snapshot. Also, we assume that the session |
5c786ded JD |
1186 | * daemon should never send a maximum stream size that is lower than |
1187 | * subbuffer size. | |
1188 | */ | |
d07ceecd MD |
1189 | consumed_pos = consumer_get_consume_start_pos(consumed_pos, |
1190 | produced_pos, nb_packets_per_stream, | |
1191 | stream->max_sb_size); | |
5c786ded | 1192 | |
9377d830 | 1193 | while ((long) (consumed_pos - produced_pos) < 0) { |
10a50311 JD |
1194 | ssize_t read_len; |
1195 | unsigned long len, padded_len; | |
128708c3 | 1196 | const char *subbuf_addr; |
fd424d99 | 1197 | struct lttng_buffer_view subbuf_view; |
10a50311 | 1198 | |
9ce5646a MD |
1199 | health_code_update(); |
1200 | ||
10a50311 JD |
1201 | DBG("UST consumer taking snapshot at pos %lu", consumed_pos); |
1202 | ||
1203 | ret = ustctl_get_subbuf(stream->ustream, &consumed_pos); | |
1204 | if (ret < 0) { | |
1205 | if (ret != -EAGAIN) { | |
1206 | PERROR("ustctl_get_subbuf snapshot"); | |
1207 | goto error_close_stream; | |
1208 | } | |
1209 | DBG("UST consumer get subbuf failed. Skipping it."); | |
1210 | consumed_pos += stream->max_sb_size; | |
ddc93ee4 | 1211 | stream->chan->lost_packets++; |
10a50311 JD |
1212 | continue; |
1213 | } | |
1214 | ||
1215 | ret = ustctl_get_subbuf_size(stream->ustream, &len); | |
1216 | if (ret < 0) { | |
1217 | ERR("Snapshot ustctl_get_subbuf_size"); | |
1218 | goto error_put_subbuf; | |
1219 | } | |
1220 | ||
1221 | ret = ustctl_get_padded_subbuf_size(stream->ustream, &padded_len); | |
1222 | if (ret < 0) { | |
1223 | ERR("Snapshot ustctl_get_padded_subbuf_size"); | |
1224 | goto error_put_subbuf; | |
1225 | } | |
1226 | ||
128708c3 JG |
1227 | ret = get_current_subbuf_addr(stream, &subbuf_addr); |
1228 | if (ret) { | |
1229 | goto error_put_subbuf; | |
1230 | } | |
1231 | ||
fd424d99 JG |
1232 | subbuf_view = lttng_buffer_view_init( |
1233 | subbuf_addr, 0, padded_len); | |
f5ba75b4 | 1234 | read_len = lttng_consumer_on_read_subbuffer_mmap( |
6f9449c2 | 1235 | stream, &subbuf_view, padded_len - len); |
10a50311 JD |
1236 | if (use_relayd) { |
1237 | if (read_len != len) { | |
56591bac | 1238 | ret = -EPERM; |
10a50311 JD |
1239 | goto error_put_subbuf; |
1240 | } | |
1241 | } else { | |
1242 | if (read_len != padded_len) { | |
56591bac | 1243 | ret = -EPERM; |
10a50311 JD |
1244 | goto error_put_subbuf; |
1245 | } | |
1246 | } | |
1247 | ||
1248 | ret = ustctl_put_subbuf(stream->ustream); | |
1249 | if (ret < 0) { | |
1250 | ERR("Snapshot ustctl_put_subbuf"); | |
1251 | goto error_close_stream; | |
1252 | } | |
1253 | consumed_pos += stream->max_sb_size; | |
1254 | } | |
1255 | ||
1256 | /* Simply close the stream so we can use it on the next snapshot. */ | |
1257 | consumer_stream_close(stream); | |
1258 | pthread_mutex_unlock(&stream->lock); | |
1259 | } | |
1260 | ||
1261 | rcu_read_unlock(); | |
1262 | return 0; | |
1263 | ||
1264 | error_put_subbuf: | |
1265 | if (ustctl_put_subbuf(stream->ustream) < 0) { | |
1266 | ERR("Snapshot ustctl_put_subbuf"); | |
1267 | } | |
1268 | error_close_stream: | |
1269 | consumer_stream_close(stream); | |
1270 | error_unlock: | |
1271 | pthread_mutex_unlock(&stream->lock); | |
10a50311 | 1272 | rcu_read_unlock(); |
d88aee68 DG |
1273 | return ret; |
1274 | } | |
1275 | ||
331744e3 | 1276 | /* |
c585821b MD |
1277 | * Receive the metadata updates from the sessiond. Supports receiving |
1278 | * overlapping metadata, but is needs to always belong to a contiguous | |
1279 | * range starting from 0. | |
1280 | * Be careful about the locks held when calling this function: it needs | |
1281 | * the metadata cache flush to concurrently progress in order to | |
1282 | * complete. | |
331744e3 JD |
1283 | */ |
1284 | int lttng_ustconsumer_recv_metadata(int sock, uint64_t key, uint64_t offset, | |
93ec662e JD |
1285 | uint64_t len, uint64_t version, |
1286 | struct lttng_consumer_channel *channel, int timer, int wait) | |
331744e3 | 1287 | { |
0c759fc9 | 1288 | int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
331744e3 JD |
1289 | char *metadata_str; |
1290 | ||
8fd623e0 | 1291 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, len); |
331744e3 JD |
1292 | |
1293 | metadata_str = zmalloc(len * sizeof(char)); | |
1294 | if (!metadata_str) { | |
1295 | PERROR("zmalloc metadata string"); | |
1296 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; | |
1297 | goto end; | |
1298 | } | |
1299 | ||
9ce5646a MD |
1300 | health_code_update(); |
1301 | ||
331744e3 JD |
1302 | /* Receive metadata string. */ |
1303 | ret = lttcomm_recv_unix_sock(sock, metadata_str, len); | |
1304 | if (ret < 0) { | |
1305 | /* Session daemon is dead so return gracefully. */ | |
1306 | ret_code = ret; | |
1307 | goto end_free; | |
1308 | } | |
1309 | ||
9ce5646a MD |
1310 | health_code_update(); |
1311 | ||
331744e3 | 1312 | pthread_mutex_lock(&channel->metadata_cache->lock); |
93ec662e JD |
1313 | ret = consumer_metadata_cache_write(channel, offset, len, version, |
1314 | metadata_str); | |
331744e3 JD |
1315 | if (ret < 0) { |
1316 | /* Unable to handle metadata. Notify session daemon. */ | |
1317 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
a32bd775 DG |
1318 | /* |
1319 | * Skip metadata flush on write error since the offset and len might | |
1320 | * not have been updated which could create an infinite loop below when | |
1321 | * waiting for the metadata cache to be flushed. | |
1322 | */ | |
1323 | pthread_mutex_unlock(&channel->metadata_cache->lock); | |
a32bd775 | 1324 | goto end_free; |
331744e3 JD |
1325 | } |
1326 | pthread_mutex_unlock(&channel->metadata_cache->lock); | |
1327 | ||
94d49140 JD |
1328 | if (!wait) { |
1329 | goto end_free; | |
1330 | } | |
5e41ebe1 | 1331 | while (consumer_metadata_cache_flushed(channel, offset + len, timer)) { |
331744e3 | 1332 | DBG("Waiting for metadata to be flushed"); |
9ce5646a MD |
1333 | |
1334 | health_code_update(); | |
1335 | ||
331744e3 JD |
1336 | usleep(DEFAULT_METADATA_AVAILABILITY_WAIT_TIME); |
1337 | } | |
1338 | ||
1339 | end_free: | |
1340 | free(metadata_str); | |
1341 | end: | |
1342 | return ret_code; | |
1343 | } | |
1344 | ||
4cbc1a04 DG |
1345 | /* |
1346 | * Receive command from session daemon and process it. | |
1347 | * | |
1348 | * Return 1 on success else a negative value or 0. | |
1349 | */ | |
3bd1e081 MD |
1350 | int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
1351 | int sock, struct pollfd *consumer_sockpoll) | |
1352 | { | |
1353 | ssize_t ret; | |
0c759fc9 | 1354 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
3bd1e081 | 1355 | struct lttcomm_consumer_msg msg; |
ffe60014 | 1356 | struct lttng_consumer_channel *channel = NULL; |
3bd1e081 | 1357 | |
9ce5646a MD |
1358 | health_code_update(); |
1359 | ||
3bd1e081 MD |
1360 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); |
1361 | if (ret != sizeof(msg)) { | |
173af62f DG |
1362 | DBG("Consumer received unexpected message size %zd (expects %zu)", |
1363 | ret, sizeof(msg)); | |
3be74084 DG |
1364 | /* |
1365 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
1366 | * since the caller handles this. | |
1367 | */ | |
489f70e9 | 1368 | if (ret > 0) { |
c6857fcf | 1369 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
489f70e9 MD |
1370 | ret = -1; |
1371 | } | |
3bd1e081 MD |
1372 | return ret; |
1373 | } | |
9ce5646a MD |
1374 | |
1375 | health_code_update(); | |
1376 | ||
84382d49 MD |
1377 | /* deprecated */ |
1378 | assert(msg.cmd_type != LTTNG_CONSUMER_STOP); | |
3bd1e081 | 1379 | |
9ce5646a MD |
1380 | health_code_update(); |
1381 | ||
3f8e211f | 1382 | /* relayd needs RCU read-side lock */ |
b0b335c8 MD |
1383 | rcu_read_lock(); |
1384 | ||
3bd1e081 | 1385 | switch (msg.cmd_type) { |
00e2e675 DG |
1386 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
1387 | { | |
f50f23d9 | 1388 | /* Session daemon status message are handled in the following call. */ |
2527bf85 | 1389 | consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
7735ef9e | 1390 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, |
d3e2ba59 JD |
1391 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id, |
1392 | msg.u.relayd_sock.relayd_session_id); | |
00e2e675 DG |
1393 | goto end_nosignal; |
1394 | } | |
173af62f DG |
1395 | case LTTNG_CONSUMER_DESTROY_RELAYD: |
1396 | { | |
a6ba4fe1 | 1397 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
173af62f DG |
1398 | struct consumer_relayd_sock_pair *relayd; |
1399 | ||
a6ba4fe1 | 1400 | DBG("UST consumer destroying relayd %" PRIu64, index); |
173af62f DG |
1401 | |
1402 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 1403 | relayd = consumer_find_relayd(index); |
173af62f | 1404 | if (relayd == NULL) { |
3448e266 | 1405 | DBG("Unable to find relayd %" PRIu64, index); |
e462382a | 1406 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
173af62f DG |
1407 | } |
1408 | ||
a6ba4fe1 DG |
1409 | /* |
1410 | * Each relayd socket pair has a refcount of stream attached to it | |
1411 | * which tells if the relayd is still active or not depending on the | |
1412 | * refcount value. | |
1413 | * | |
1414 | * This will set the destroy flag of the relayd object and destroy it | |
1415 | * if the refcount reaches zero when called. | |
1416 | * | |
1417 | * The destroy can happen either here or when a stream fd hangs up. | |
1418 | */ | |
f50f23d9 DG |
1419 | if (relayd) { |
1420 | consumer_flag_relayd_for_destroy(relayd); | |
1421 | } | |
1422 | ||
d88aee68 | 1423 | goto end_msg_sessiond; |
173af62f | 1424 | } |
3bd1e081 MD |
1425 | case LTTNG_CONSUMER_UPDATE_STREAM: |
1426 | { | |
3f8e211f | 1427 | rcu_read_unlock(); |
7ad0a0cb | 1428 | return -ENOSYS; |
3bd1e081 | 1429 | } |
6d805429 | 1430 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 1431 | { |
3be74084 | 1432 | int ret, is_data_pending; |
6d805429 | 1433 | uint64_t id = msg.u.data_pending.session_id; |
ca22feea | 1434 | |
6d805429 | 1435 | DBG("UST consumer data pending command for id %" PRIu64, id); |
ca22feea | 1436 | |
3be74084 | 1437 | is_data_pending = consumer_data_pending(id); |
ca22feea DG |
1438 | |
1439 | /* Send back returned value to session daemon */ | |
3be74084 DG |
1440 | ret = lttcomm_send_unix_sock(sock, &is_data_pending, |
1441 | sizeof(is_data_pending)); | |
ca22feea | 1442 | if (ret < 0) { |
3be74084 | 1443 | DBG("Error when sending the data pending ret code: %d", ret); |
489f70e9 | 1444 | goto error_fatal; |
ca22feea | 1445 | } |
f50f23d9 DG |
1446 | |
1447 | /* | |
1448 | * No need to send back a status message since the data pending | |
1449 | * returned value is the response. | |
1450 | */ | |
ca22feea | 1451 | break; |
53632229 | 1452 | } |
ffe60014 DG |
1453 | case LTTNG_CONSUMER_ASK_CHANNEL_CREATION: |
1454 | { | |
1455 | int ret; | |
1456 | struct ustctl_consumer_channel_attr attr; | |
d2956687 JG |
1457 | const uint64_t chunk_id = msg.u.ask_channel.chunk_id.value; |
1458 | const struct lttng_credentials buffer_credentials = { | |
1459 | .uid = msg.u.ask_channel.buffer_credentials.uid, | |
1460 | .gid = msg.u.ask_channel.buffer_credentials.gid, | |
1461 | }; | |
ffe60014 DG |
1462 | |
1463 | /* Create a plain object and reserve a channel key. */ | |
a2814ea7 JG |
1464 | channel = consumer_allocate_channel( |
1465 | msg.u.ask_channel.key, | |
1466 | msg.u.ask_channel.session_id, | |
d2956687 JG |
1467 | msg.u.ask_channel.chunk_id.is_set ? |
1468 | &chunk_id : NULL, | |
1469 | msg.u.ask_channel.pathname, | |
1470 | msg.u.ask_channel.name, | |
1471 | msg.u.ask_channel.relayd_id, | |
1624d5b7 JD |
1472 | (enum lttng_event_output) msg.u.ask_channel.output, |
1473 | msg.u.ask_channel.tracefile_size, | |
2bba9e53 | 1474 | msg.u.ask_channel.tracefile_count, |
1950109e | 1475 | msg.u.ask_channel.session_id_per_pid, |
ecc48a90 | 1476 | msg.u.ask_channel.monitor, |
d7ba1388 | 1477 | msg.u.ask_channel.live_timer_interval, |
a2814ea7 | 1478 | msg.u.ask_channel.is_live, |
3d071855 | 1479 | msg.u.ask_channel.root_shm_path, |
d7ba1388 | 1480 | msg.u.ask_channel.shm_path); |
ffe60014 DG |
1481 | if (!channel) { |
1482 | goto end_channel_error; | |
1483 | } | |
1484 | ||
d2956687 JG |
1485 | LTTNG_OPTIONAL_SET(&channel->buffer_credentials, |
1486 | buffer_credentials); | |
1487 | ||
567eb353 DG |
1488 | /* |
1489 | * Assign UST application UID to the channel. This value is ignored for | |
1490 | * per PID buffers. This is specific to UST thus setting this after the | |
1491 | * allocation. | |
1492 | */ | |
1493 | channel->ust_app_uid = msg.u.ask_channel.ust_app_uid; | |
1494 | ||
ffe60014 DG |
1495 | /* Build channel attributes from received message. */ |
1496 | attr.subbuf_size = msg.u.ask_channel.subbuf_size; | |
1497 | attr.num_subbuf = msg.u.ask_channel.num_subbuf; | |
1498 | attr.overwrite = msg.u.ask_channel.overwrite; | |
1499 | attr.switch_timer_interval = msg.u.ask_channel.switch_timer_interval; | |
1500 | attr.read_timer_interval = msg.u.ask_channel.read_timer_interval; | |
7972aab2 | 1501 | attr.chan_id = msg.u.ask_channel.chan_id; |
ffe60014 | 1502 | memcpy(attr.uuid, msg.u.ask_channel.uuid, sizeof(attr.uuid)); |
491d1539 | 1503 | attr.blocking_timeout= msg.u.ask_channel.blocking_timeout; |
ffe60014 | 1504 | |
0c759fc9 DG |
1505 | /* Match channel buffer type to the UST abi. */ |
1506 | switch (msg.u.ask_channel.output) { | |
1507 | case LTTNG_EVENT_MMAP: | |
1508 | default: | |
1509 | attr.output = LTTNG_UST_MMAP; | |
1510 | break; | |
1511 | } | |
1512 | ||
ffe60014 DG |
1513 | /* Translate and save channel type. */ |
1514 | switch (msg.u.ask_channel.type) { | |
1515 | case LTTNG_UST_CHAN_PER_CPU: | |
1516 | channel->type = CONSUMER_CHANNEL_TYPE_DATA; | |
1517 | attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8633d6e3 MD |
1518 | /* |
1519 | * Set refcount to 1 for owner. Below, we will | |
1520 | * pass ownership to the | |
1521 | * consumer_thread_channel_poll() thread. | |
1522 | */ | |
1523 | channel->refcount = 1; | |
ffe60014 DG |
1524 | break; |
1525 | case LTTNG_UST_CHAN_METADATA: | |
1526 | channel->type = CONSUMER_CHANNEL_TYPE_METADATA; | |
1527 | attr.type = LTTNG_UST_CHAN_METADATA; | |
1528 | break; | |
1529 | default: | |
1530 | assert(0); | |
1531 | goto error_fatal; | |
1532 | }; | |
1533 | ||
9ce5646a MD |
1534 | health_code_update(); |
1535 | ||
d2956687 | 1536 | ret = ask_channel(ctx, channel, &attr); |
ffe60014 DG |
1537 | if (ret < 0) { |
1538 | goto end_channel_error; | |
1539 | } | |
1540 | ||
fc643247 MD |
1541 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
1542 | ret = consumer_metadata_cache_allocate(channel); | |
1543 | if (ret < 0) { | |
1544 | ERR("Allocating metadata cache"); | |
1545 | goto end_channel_error; | |
1546 | } | |
1547 | consumer_timer_switch_start(channel, attr.switch_timer_interval); | |
1548 | attr.switch_timer_interval = 0; | |
94d49140 | 1549 | } else { |
e9404c27 JG |
1550 | int monitor_start_ret; |
1551 | ||
94d49140 JD |
1552 | consumer_timer_live_start(channel, |
1553 | msg.u.ask_channel.live_timer_interval); | |
e9404c27 JG |
1554 | monitor_start_ret = consumer_timer_monitor_start( |
1555 | channel, | |
1556 | msg.u.ask_channel.monitor_timer_interval); | |
1557 | if (monitor_start_ret < 0) { | |
1558 | ERR("Starting channel monitoring timer failed"); | |
1559 | goto end_channel_error; | |
1560 | } | |
fc643247 MD |
1561 | } |
1562 | ||
9ce5646a MD |
1563 | health_code_update(); |
1564 | ||
ffe60014 DG |
1565 | /* |
1566 | * Add the channel to the internal state AFTER all streams were created | |
1567 | * and successfully sent to session daemon. This way, all streams must | |
1568 | * be ready before this channel is visible to the threads. | |
fc643247 MD |
1569 | * If add_channel succeeds, ownership of the channel is |
1570 | * passed to consumer_thread_channel_poll(). | |
ffe60014 DG |
1571 | */ |
1572 | ret = add_channel(channel, ctx); | |
1573 | if (ret < 0) { | |
ea88ca2a MD |
1574 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
1575 | if (channel->switch_timer_enabled == 1) { | |
1576 | consumer_timer_switch_stop(channel); | |
1577 | } | |
1578 | consumer_metadata_cache_destroy(channel); | |
1579 | } | |
d3e2ba59 JD |
1580 | if (channel->live_timer_enabled == 1) { |
1581 | consumer_timer_live_stop(channel); | |
1582 | } | |
e9404c27 JG |
1583 | if (channel->monitor_timer_enabled == 1) { |
1584 | consumer_timer_monitor_stop(channel); | |
1585 | } | |
ffe60014 DG |
1586 | goto end_channel_error; |
1587 | } | |
1588 | ||
9ce5646a MD |
1589 | health_code_update(); |
1590 | ||
ffe60014 DG |
1591 | /* |
1592 | * Channel and streams are now created. Inform the session daemon that | |
1593 | * everything went well and should wait to receive the channel and | |
1594 | * streams with ustctl API. | |
1595 | */ | |
1596 | ret = consumer_send_status_channel(sock, channel); | |
1597 | if (ret < 0) { | |
1598 | /* | |
489f70e9 | 1599 | * There is probably a problem on the socket. |
ffe60014 | 1600 | */ |
489f70e9 | 1601 | goto error_fatal; |
ffe60014 DG |
1602 | } |
1603 | ||
1604 | break; | |
1605 | } | |
1606 | case LTTNG_CONSUMER_GET_CHANNEL: | |
1607 | { | |
1608 | int ret, relayd_err = 0; | |
d88aee68 | 1609 | uint64_t key = msg.u.get_channel.key; |
ffe60014 | 1610 | struct lttng_consumer_channel *channel; |
ffe60014 DG |
1611 | |
1612 | channel = consumer_find_channel(key); | |
1613 | if (!channel) { | |
8fd623e0 | 1614 | ERR("UST consumer get channel key %" PRIu64 " not found", key); |
e462382a | 1615 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
f3a1fc7b | 1616 | goto end_get_channel; |
ffe60014 DG |
1617 | } |
1618 | ||
9ce5646a MD |
1619 | health_code_update(); |
1620 | ||
a3a86f35 JG |
1621 | /* Send the channel to sessiond (and relayd, if applicable). */ |
1622 | ret = send_channel_to_sessiond_and_relayd(sock, channel, ctx, | |
1623 | &relayd_err); | |
ffe60014 DG |
1624 | if (ret < 0) { |
1625 | if (relayd_err) { | |
1626 | /* | |
1627 | * We were unable to send to the relayd the stream so avoid | |
1628 | * sending back a fatal error to the thread since this is OK | |
f2a444f1 DG |
1629 | * and the consumer can continue its work. The above call |
1630 | * has sent the error status message to the sessiond. | |
ffe60014 | 1631 | */ |
f3a1fc7b | 1632 | goto end_get_channel_nosignal; |
ffe60014 DG |
1633 | } |
1634 | /* | |
1635 | * The communicaton was broken hence there is a bad state between | |
1636 | * the consumer and sessiond so stop everything. | |
1637 | */ | |
f3a1fc7b | 1638 | goto error_get_channel_fatal; |
ffe60014 DG |
1639 | } |
1640 | ||
9ce5646a MD |
1641 | health_code_update(); |
1642 | ||
10a50311 JD |
1643 | /* |
1644 | * In no monitor mode, the streams ownership is kept inside the channel | |
1645 | * so don't send them to the data thread. | |
1646 | */ | |
1647 | if (!channel->monitor) { | |
f3a1fc7b | 1648 | goto end_get_channel; |
10a50311 JD |
1649 | } |
1650 | ||
d88aee68 DG |
1651 | ret = send_streams_to_thread(channel, ctx); |
1652 | if (ret < 0) { | |
1653 | /* | |
1654 | * If we are unable to send the stream to the thread, there is | |
1655 | * a big problem so just stop everything. | |
1656 | */ | |
f3a1fc7b | 1657 | goto error_get_channel_fatal; |
ffe60014 | 1658 | } |
ffe60014 DG |
1659 | /* List MUST be empty after or else it could be reused. */ |
1660 | assert(cds_list_empty(&channel->streams.head)); | |
f3a1fc7b | 1661 | end_get_channel: |
d88aee68 | 1662 | goto end_msg_sessiond; |
f3a1fc7b JG |
1663 | error_get_channel_fatal: |
1664 | goto error_fatal; | |
1665 | end_get_channel_nosignal: | |
1666 | goto end_nosignal; | |
d88aee68 DG |
1667 | } |
1668 | case LTTNG_CONSUMER_DESTROY_CHANNEL: | |
1669 | { | |
1670 | uint64_t key = msg.u.destroy_channel.key; | |
d88aee68 | 1671 | |
a0cbdd2e MD |
1672 | /* |
1673 | * Only called if streams have not been sent to stream | |
1674 | * manager thread. However, channel has been sent to | |
1675 | * channel manager thread. | |
1676 | */ | |
1677 | notify_thread_del_channel(ctx, key); | |
d88aee68 | 1678 | goto end_msg_sessiond; |
ffe60014 | 1679 | } |
d88aee68 DG |
1680 | case LTTNG_CONSUMER_CLOSE_METADATA: |
1681 | { | |
1682 | int ret; | |
1683 | ||
1684 | ret = close_metadata(msg.u.close_metadata.key); | |
1685 | if (ret != 0) { | |
1686 | ret_code = ret; | |
1687 | } | |
1688 | ||
1689 | goto end_msg_sessiond; | |
1690 | } | |
7972aab2 DG |
1691 | case LTTNG_CONSUMER_FLUSH_CHANNEL: |
1692 | { | |
1693 | int ret; | |
1694 | ||
1695 | ret = flush_channel(msg.u.flush_channel.key); | |
1696 | if (ret != 0) { | |
1697 | ret_code = ret; | |
1698 | } | |
1699 | ||
1700 | goto end_msg_sessiond; | |
1701 | } | |
0dd01979 MD |
1702 | case LTTNG_CONSUMER_CLEAR_QUIESCENT_CHANNEL: |
1703 | { | |
1704 | int ret; | |
1705 | ||
1706 | ret = clear_quiescent_channel( | |
1707 | msg.u.clear_quiescent_channel.key); | |
1708 | if (ret != 0) { | |
1709 | ret_code = ret; | |
1710 | } | |
1711 | ||
1712 | goto end_msg_sessiond; | |
1713 | } | |
d88aee68 | 1714 | case LTTNG_CONSUMER_PUSH_METADATA: |
ffe60014 DG |
1715 | { |
1716 | int ret; | |
d88aee68 | 1717 | uint64_t len = msg.u.push_metadata.len; |
d88aee68 | 1718 | uint64_t key = msg.u.push_metadata.key; |
331744e3 | 1719 | uint64_t offset = msg.u.push_metadata.target_offset; |
93ec662e | 1720 | uint64_t version = msg.u.push_metadata.version; |
ffe60014 DG |
1721 | struct lttng_consumer_channel *channel; |
1722 | ||
8fd623e0 DG |
1723 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, |
1724 | len); | |
ffe60014 DG |
1725 | |
1726 | channel = consumer_find_channel(key); | |
1727 | if (!channel) { | |
000baf6a DG |
1728 | /* |
1729 | * This is possible if the metadata creation on the consumer side | |
1730 | * is in flight vis-a-vis a concurrent push metadata from the | |
1731 | * session daemon. Simply return that the channel failed and the | |
1732 | * session daemon will handle that message correctly considering | |
1733 | * that this race is acceptable thus the DBG() statement here. | |
1734 | */ | |
1735 | DBG("UST consumer push metadata %" PRIu64 " not found", key); | |
1736 | ret_code = LTTCOMM_CONSUMERD_CHANNEL_FAIL; | |
a8ffe244 | 1737 | goto end_push_metadata_msg_sessiond; |
d88aee68 DG |
1738 | } |
1739 | ||
9ce5646a MD |
1740 | health_code_update(); |
1741 | ||
c585821b MD |
1742 | if (!len) { |
1743 | /* | |
1744 | * There is nothing to receive. We have simply | |
1745 | * checked whether the channel can be found. | |
1746 | */ | |
1747 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
a8ffe244 | 1748 | goto end_push_metadata_msg_sessiond; |
c585821b MD |
1749 | } |
1750 | ||
d88aee68 | 1751 | /* Tell session daemon we are ready to receive the metadata. */ |
0c759fc9 | 1752 | ret = consumer_send_status_msg(sock, LTTCOMM_CONSUMERD_SUCCESS); |
ffe60014 DG |
1753 | if (ret < 0) { |
1754 | /* Somehow, the session daemon is not responding anymore. */ | |
a8ffe244 | 1755 | goto error_push_metadata_fatal; |
d88aee68 DG |
1756 | } |
1757 | ||
9ce5646a MD |
1758 | health_code_update(); |
1759 | ||
d88aee68 | 1760 | /* Wait for more data. */ |
9ce5646a MD |
1761 | health_poll_entry(); |
1762 | ret = lttng_consumer_poll_socket(consumer_sockpoll); | |
1763 | health_poll_exit(); | |
84382d49 | 1764 | if (ret) { |
a8ffe244 | 1765 | goto error_push_metadata_fatal; |
d88aee68 DG |
1766 | } |
1767 | ||
9ce5646a MD |
1768 | health_code_update(); |
1769 | ||
331744e3 | 1770 | ret = lttng_ustconsumer_recv_metadata(sock, key, offset, |
93ec662e | 1771 | len, version, channel, 0, 1); |
d88aee68 | 1772 | if (ret < 0) { |
331744e3 | 1773 | /* error receiving from sessiond */ |
a8ffe244 | 1774 | goto error_push_metadata_fatal; |
331744e3 JD |
1775 | } else { |
1776 | ret_code = ret; | |
a8ffe244 | 1777 | goto end_push_metadata_msg_sessiond; |
d88aee68 | 1778 | } |
a8ffe244 JG |
1779 | end_push_metadata_msg_sessiond: |
1780 | goto end_msg_sessiond; | |
1781 | error_push_metadata_fatal: | |
1782 | goto error_fatal; | |
d88aee68 DG |
1783 | } |
1784 | case LTTNG_CONSUMER_SETUP_METADATA: | |
1785 | { | |
1786 | int ret; | |
1787 | ||
1788 | ret = setup_metadata(ctx, msg.u.setup_metadata.key); | |
1789 | if (ret) { | |
1790 | ret_code = ret; | |
1791 | } | |
1792 | goto end_msg_sessiond; | |
ffe60014 | 1793 | } |
6dc3064a DG |
1794 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
1795 | { | |
3eb928aa MD |
1796 | struct lttng_consumer_channel *channel; |
1797 | uint64_t key = msg.u.snapshot_channel.key; | |
1798 | ||
1799 | channel = consumer_find_channel(key); | |
1800 | if (!channel) { | |
1801 | DBG("UST snapshot channel not found for key %" PRIu64, key); | |
1802 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
10a50311 | 1803 | } else { |
3eb928aa MD |
1804 | if (msg.u.snapshot_channel.metadata) { |
1805 | ret = snapshot_metadata(channel, key, | |
1806 | msg.u.snapshot_channel.pathname, | |
1807 | msg.u.snapshot_channel.relayd_id, | |
d2956687 | 1808 | ctx); |
3eb928aa MD |
1809 | if (ret < 0) { |
1810 | ERR("Snapshot metadata failed"); | |
1811 | ret_code = LTTCOMM_CONSUMERD_SNAPSHOT_FAILED; | |
1812 | } | |
1813 | } else { | |
1814 | ret = snapshot_channel(channel, key, | |
1815 | msg.u.snapshot_channel.pathname, | |
1816 | msg.u.snapshot_channel.relayd_id, | |
1817 | msg.u.snapshot_channel.nb_packets_per_stream, | |
1818 | ctx); | |
1819 | if (ret < 0) { | |
1820 | ERR("Snapshot channel failed"); | |
1821 | ret_code = LTTCOMM_CONSUMERD_SNAPSHOT_FAILED; | |
1822 | } | |
10a50311 JD |
1823 | } |
1824 | } | |
9ce5646a | 1825 | health_code_update(); |
6dc3064a DG |
1826 | ret = consumer_send_status_msg(sock, ret_code); |
1827 | if (ret < 0) { | |
1828 | /* Somehow, the session daemon is not responding anymore. */ | |
1829 | goto end_nosignal; | |
1830 | } | |
9ce5646a | 1831 | health_code_update(); |
6dc3064a DG |
1832 | break; |
1833 | } | |
fb83fe64 JD |
1834 | case LTTNG_CONSUMER_DISCARDED_EVENTS: |
1835 | { | |
beb59458 MJ |
1836 | int ret = 0; |
1837 | uint64_t discarded_events; | |
fb83fe64 JD |
1838 | struct lttng_ht_iter iter; |
1839 | struct lttng_ht *ht; | |
1840 | struct lttng_consumer_stream *stream; | |
1841 | uint64_t id = msg.u.discarded_events.session_id; | |
1842 | uint64_t key = msg.u.discarded_events.channel_key; | |
1843 | ||
1844 | DBG("UST consumer discarded events command for session id %" | |
1845 | PRIu64, id); | |
1846 | rcu_read_lock(); | |
1847 | pthread_mutex_lock(&consumer_data.lock); | |
1848 | ||
1849 | ht = consumer_data.stream_list_ht; | |
1850 | ||
1851 | /* | |
1852 | * We only need a reference to the channel, but they are not | |
1853 | * directly indexed, so we just use the first matching stream | |
1854 | * to extract the information we need, we default to 0 if not | |
1855 | * found (no events are dropped if the channel is not yet in | |
1856 | * use). | |
1857 | */ | |
beb59458 | 1858 | discarded_events = 0; |
fb83fe64 JD |
1859 | cds_lfht_for_each_entry_duplicate(ht->ht, |
1860 | ht->hash_fct(&id, lttng_ht_seed), | |
1861 | ht->match_fct, &id, | |
1862 | &iter.iter, stream, node_session_id.node) { | |
1863 | if (stream->chan->key == key) { | |
beb59458 | 1864 | discarded_events = stream->chan->discarded_events; |
fb83fe64 JD |
1865 | break; |
1866 | } | |
1867 | } | |
1868 | pthread_mutex_unlock(&consumer_data.lock); | |
1869 | rcu_read_unlock(); | |
1870 | ||
1871 | DBG("UST consumer discarded events command for session id %" | |
1872 | PRIu64 ", channel key %" PRIu64, id, key); | |
1873 | ||
1874 | health_code_update(); | |
1875 | ||
1876 | /* Send back returned value to session daemon */ | |
beb59458 | 1877 | ret = lttcomm_send_unix_sock(sock, &discarded_events, sizeof(discarded_events)); |
fb83fe64 JD |
1878 | if (ret < 0) { |
1879 | PERROR("send discarded events"); | |
1880 | goto error_fatal; | |
1881 | } | |
1882 | ||
1883 | break; | |
1884 | } | |
1885 | case LTTNG_CONSUMER_LOST_PACKETS: | |
1886 | { | |
9a06e8d4 JG |
1887 | int ret; |
1888 | uint64_t lost_packets; | |
fb83fe64 JD |
1889 | struct lttng_ht_iter iter; |
1890 | struct lttng_ht *ht; | |
1891 | struct lttng_consumer_stream *stream; | |
1892 | uint64_t id = msg.u.lost_packets.session_id; | |
1893 | uint64_t key = msg.u.lost_packets.channel_key; | |
1894 | ||
1895 | DBG("UST consumer lost packets command for session id %" | |
1896 | PRIu64, id); | |
1897 | rcu_read_lock(); | |
1898 | pthread_mutex_lock(&consumer_data.lock); | |
1899 | ||
1900 | ht = consumer_data.stream_list_ht; | |
1901 | ||
1902 | /* | |
1903 | * We only need a reference to the channel, but they are not | |
1904 | * directly indexed, so we just use the first matching stream | |
1905 | * to extract the information we need, we default to 0 if not | |
1906 | * found (no packets lost if the channel is not yet in use). | |
1907 | */ | |
9a06e8d4 | 1908 | lost_packets = 0; |
fb83fe64 JD |
1909 | cds_lfht_for_each_entry_duplicate(ht->ht, |
1910 | ht->hash_fct(&id, lttng_ht_seed), | |
1911 | ht->match_fct, &id, | |
1912 | &iter.iter, stream, node_session_id.node) { | |
1913 | if (stream->chan->key == key) { | |
9a06e8d4 | 1914 | lost_packets = stream->chan->lost_packets; |
fb83fe64 JD |
1915 | break; |
1916 | } | |
1917 | } | |
1918 | pthread_mutex_unlock(&consumer_data.lock); | |
1919 | rcu_read_unlock(); | |
1920 | ||
1921 | DBG("UST consumer lost packets command for session id %" | |
1922 | PRIu64 ", channel key %" PRIu64, id, key); | |
1923 | ||
1924 | health_code_update(); | |
1925 | ||
1926 | /* Send back returned value to session daemon */ | |
9a06e8d4 JG |
1927 | ret = lttcomm_send_unix_sock(sock, &lost_packets, |
1928 | sizeof(lost_packets)); | |
fb83fe64 JD |
1929 | if (ret < 0) { |
1930 | PERROR("send lost packets"); | |
1931 | goto error_fatal; | |
1932 | } | |
1933 | ||
1934 | break; | |
1935 | } | |
b3530820 JG |
1936 | case LTTNG_CONSUMER_SET_CHANNEL_MONITOR_PIPE: |
1937 | { | |
1938 | int channel_monitor_pipe; | |
1939 | ||
1940 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1941 | /* Successfully received the command's type. */ | |
1942 | ret = consumer_send_status_msg(sock, ret_code); | |
1943 | if (ret < 0) { | |
1944 | goto error_fatal; | |
1945 | } | |
1946 | ||
1947 | ret = lttcomm_recv_fds_unix_sock(sock, &channel_monitor_pipe, | |
1948 | 1); | |
1949 | if (ret != sizeof(channel_monitor_pipe)) { | |
1950 | ERR("Failed to receive channel monitor pipe"); | |
1951 | goto error_fatal; | |
1952 | } | |
1953 | ||
1954 | DBG("Received channel monitor pipe (%d)", channel_monitor_pipe); | |
1955 | ret = consumer_timer_thread_set_channel_monitor_pipe( | |
1956 | channel_monitor_pipe); | |
1957 | if (!ret) { | |
1958 | int flags; | |
1959 | ||
1960 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1961 | /* Set the pipe as non-blocking. */ | |
1962 | ret = fcntl(channel_monitor_pipe, F_GETFL, 0); | |
1963 | if (ret == -1) { | |
1964 | PERROR("fcntl get flags of the channel monitoring pipe"); | |
1965 | goto error_fatal; | |
1966 | } | |
1967 | flags = ret; | |
1968 | ||
1969 | ret = fcntl(channel_monitor_pipe, F_SETFL, | |
1970 | flags | O_NONBLOCK); | |
1971 | if (ret == -1) { | |
1972 | PERROR("fcntl set O_NONBLOCK flag of the channel monitoring pipe"); | |
1973 | goto error_fatal; | |
1974 | } | |
1975 | DBG("Channel monitor pipe set as non-blocking"); | |
1976 | } else { | |
1977 | ret_code = LTTCOMM_CONSUMERD_ALREADY_SET; | |
1978 | } | |
1979 | goto end_msg_sessiond; | |
1980 | } | |
b99a8d42 JD |
1981 | case LTTNG_CONSUMER_ROTATE_CHANNEL: |
1982 | { | |
92b7a7f8 MD |
1983 | struct lttng_consumer_channel *channel; |
1984 | uint64_t key = msg.u.rotate_channel.key; | |
b99a8d42 | 1985 | |
92b7a7f8 MD |
1986 | channel = consumer_find_channel(key); |
1987 | if (!channel) { | |
1988 | DBG("Channel %" PRIu64 " not found", key); | |
1989 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
1990 | } else { | |
1991 | /* | |
1992 | * Sample the rotate position of all the streams in | |
1993 | * this channel. | |
1994 | */ | |
1995 | ret = lttng_consumer_rotate_channel(channel, key, | |
92b7a7f8 MD |
1996 | msg.u.rotate_channel.relayd_id, |
1997 | msg.u.rotate_channel.metadata, | |
92b7a7f8 MD |
1998 | ctx); |
1999 | if (ret < 0) { | |
2000 | ERR("Rotate channel failed"); | |
2001 | ret_code = LTTCOMM_CONSUMERD_ROTATION_FAIL; | |
2002 | } | |
b99a8d42 | 2003 | |
92b7a7f8 MD |
2004 | health_code_update(); |
2005 | } | |
b99a8d42 JD |
2006 | ret = consumer_send_status_msg(sock, ret_code); |
2007 | if (ret < 0) { | |
2008 | /* Somehow, the session daemon is not responding anymore. */ | |
41c7a76d | 2009 | goto end_rotate_channel_nosignal; |
b99a8d42 JD |
2010 | } |
2011 | ||
2012 | /* | |
2013 | * Rotate the streams that are ready right now. | |
2014 | * FIXME: this is a second consecutive iteration over the | |
2015 | * streams in a channel, there is probably a better way to | |
2016 | * handle this, but it needs to be after the | |
2017 | * consumer_send_status_msg() call. | |
2018 | */ | |
92b7a7f8 MD |
2019 | if (channel) { |
2020 | ret = lttng_consumer_rotate_ready_streams( | |
2021 | channel, key, ctx); | |
2022 | if (ret < 0) { | |
2023 | ERR("Rotate channel failed"); | |
2024 | } | |
b99a8d42 JD |
2025 | } |
2026 | break; | |
41c7a76d JG |
2027 | end_rotate_channel_nosignal: |
2028 | goto end_nosignal; | |
b99a8d42 | 2029 | } |
5f3aff8b MD |
2030 | case LTTNG_CONSUMER_CLEAR_CHANNEL: |
2031 | { | |
2032 | struct lttng_consumer_channel *channel; | |
2033 | uint64_t key = msg.u.clear_channel.key; | |
2034 | ||
2035 | channel = consumer_find_channel(key); | |
2036 | if (!channel) { | |
2037 | DBG("Channel %" PRIu64 " not found", key); | |
2038 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
2039 | } else { | |
2040 | ret = lttng_consumer_clear_channel(channel); | |
2041 | if (ret) { | |
2042 | ERR("Clear channel failed key %" PRIu64, key); | |
2043 | ret_code = ret; | |
2044 | } | |
2045 | ||
2046 | health_code_update(); | |
2047 | } | |
2048 | ret = consumer_send_status_msg(sock, ret_code); | |
2049 | if (ret < 0) { | |
2050 | /* Somehow, the session daemon is not responding anymore. */ | |
2051 | goto end_nosignal; | |
2052 | } | |
2053 | break; | |
2054 | } | |
d2956687 | 2055 | case LTTNG_CONSUMER_INIT: |
00fb02ac | 2056 | { |
d2956687 JG |
2057 | ret_code = lttng_consumer_init_command(ctx, |
2058 | msg.u.init.sessiond_uuid); | |
d88744a4 | 2059 | health_code_update(); |
d88744a4 JD |
2060 | ret = consumer_send_status_msg(sock, ret_code); |
2061 | if (ret < 0) { | |
2062 | /* Somehow, the session daemon is not responding anymore. */ | |
2063 | goto end_nosignal; | |
2064 | } | |
2065 | break; | |
2066 | } | |
d2956687 | 2067 | case LTTNG_CONSUMER_CREATE_TRACE_CHUNK: |
d88744a4 | 2068 | { |
d2956687 | 2069 | const struct lttng_credentials credentials = { |
e5add6d0 JG |
2070 | .uid = msg.u.create_trace_chunk.credentials.value.uid, |
2071 | .gid = msg.u.create_trace_chunk.credentials.value.gid, | |
d2956687 JG |
2072 | }; |
2073 | const bool is_local_trace = | |
2074 | !msg.u.create_trace_chunk.relayd_id.is_set; | |
2075 | const uint64_t relayd_id = | |
2076 | msg.u.create_trace_chunk.relayd_id.value; | |
2077 | const char *chunk_override_name = | |
2078 | *msg.u.create_trace_chunk.override_name ? | |
2079 | msg.u.create_trace_chunk.override_name : | |
2080 | NULL; | |
cbf53d23 | 2081 | struct lttng_directory_handle *chunk_directory_handle = NULL; |
d88744a4 | 2082 | |
d2956687 JG |
2083 | /* |
2084 | * The session daemon will only provide a chunk directory file | |
2085 | * descriptor for local traces. | |
2086 | */ | |
2087 | if (is_local_trace) { | |
2088 | int chunk_dirfd; | |
19990ed5 | 2089 | |
d2956687 JG |
2090 | /* Acnowledge the reception of the command. */ |
2091 | ret = consumer_send_status_msg(sock, | |
2092 | LTTCOMM_CONSUMERD_SUCCESS); | |
2093 | if (ret < 0) { | |
2094 | /* Somehow, the session daemon is not responding anymore. */ | |
2095 | goto end_nosignal; | |
2096 | } | |
92816cc3 | 2097 | |
5da88b0f MD |
2098 | /* |
2099 | * Receive trace chunk domain dirfd. | |
2100 | */ | |
d2956687 JG |
2101 | ret = lttcomm_recv_fds_unix_sock(sock, &chunk_dirfd, 1); |
2102 | if (ret != sizeof(chunk_dirfd)) { | |
5da88b0f | 2103 | ERR("Failed to receive trace chunk domain directory file descriptor"); |
d2956687 JG |
2104 | goto error_fatal; |
2105 | } | |
92816cc3 | 2106 | |
5da88b0f | 2107 | DBG("Received trace chunk domain directory fd (%d)", |
d2956687 | 2108 | chunk_dirfd); |
cbf53d23 | 2109 | chunk_directory_handle = lttng_directory_handle_create_from_dirfd( |
d2956687 | 2110 | chunk_dirfd); |
cbf53d23 | 2111 | if (!chunk_directory_handle) { |
5da88b0f | 2112 | ERR("Failed to initialize chunk domain directory handle from directory file descriptor"); |
d2956687 JG |
2113 | if (close(chunk_dirfd)) { |
2114 | PERROR("Failed to close chunk directory file descriptor"); | |
2115 | } | |
2116 | goto error_fatal; | |
2117 | } | |
92816cc3 JG |
2118 | } |
2119 | ||
d2956687 JG |
2120 | ret_code = lttng_consumer_create_trace_chunk( |
2121 | !is_local_trace ? &relayd_id : NULL, | |
2122 | msg.u.create_trace_chunk.session_id, | |
2123 | msg.u.create_trace_chunk.chunk_id, | |
e5add6d0 JG |
2124 | (time_t) msg.u.create_trace_chunk |
2125 | .creation_timestamp, | |
d2956687 | 2126 | chunk_override_name, |
e5add6d0 JG |
2127 | msg.u.create_trace_chunk.credentials.is_set ? |
2128 | &credentials : | |
2129 | NULL, | |
cbf53d23 JG |
2130 | chunk_directory_handle); |
2131 | lttng_directory_handle_put(chunk_directory_handle); | |
d2956687 | 2132 | goto end_msg_sessiond; |
00fb02ac | 2133 | } |
d2956687 | 2134 | case LTTNG_CONSUMER_CLOSE_TRACE_CHUNK: |
a1ae2ea5 | 2135 | { |
bbc4768c JG |
2136 | enum lttng_trace_chunk_command_type close_command = |
2137 | msg.u.close_trace_chunk.close_command.value; | |
d2956687 JG |
2138 | const uint64_t relayd_id = |
2139 | msg.u.close_trace_chunk.relayd_id.value; | |
ecd1a12f MD |
2140 | struct lttcomm_consumer_close_trace_chunk_reply reply; |
2141 | char closed_trace_chunk_path[LTTNG_PATH_MAX]; | |
2142 | int ret; | |
d2956687 JG |
2143 | |
2144 | ret_code = lttng_consumer_close_trace_chunk( | |
2145 | msg.u.close_trace_chunk.relayd_id.is_set ? | |
bbc4768c JG |
2146 | &relayd_id : |
2147 | NULL, | |
d2956687 JG |
2148 | msg.u.close_trace_chunk.session_id, |
2149 | msg.u.close_trace_chunk.chunk_id, | |
bbc4768c JG |
2150 | (time_t) msg.u.close_trace_chunk.close_timestamp, |
2151 | msg.u.close_trace_chunk.close_command.is_set ? | |
2152 | &close_command : | |
ecd1a12f MD |
2153 | NULL, closed_trace_chunk_path); |
2154 | reply.ret_code = ret_code; | |
2155 | reply.path_length = strlen(closed_trace_chunk_path) + 1; | |
2156 | ret = lttcomm_send_unix_sock(sock, &reply, sizeof(reply)); | |
2157 | if (ret != sizeof(reply)) { | |
2158 | goto error_fatal; | |
2159 | } | |
2160 | ret = lttcomm_send_unix_sock(sock, closed_trace_chunk_path, | |
2161 | reply.path_length); | |
2162 | if (ret != reply.path_length) { | |
2163 | goto error_fatal; | |
2164 | } | |
2165 | goto end_nosignal; | |
a1ae2ea5 | 2166 | } |
d2956687 | 2167 | case LTTNG_CONSUMER_TRACE_CHUNK_EXISTS: |
3654ed19 | 2168 | { |
d2956687 JG |
2169 | const uint64_t relayd_id = |
2170 | msg.u.trace_chunk_exists.relayd_id.value; | |
2171 | ||
2172 | ret_code = lttng_consumer_trace_chunk_exists( | |
2173 | msg.u.trace_chunk_exists.relayd_id.is_set ? | |
2174 | &relayd_id : NULL, | |
2175 | msg.u.trace_chunk_exists.session_id, | |
2176 | msg.u.trace_chunk_exists.chunk_id); | |
2177 | goto end_msg_sessiond; | |
3654ed19 | 2178 | } |
3bd1e081 MD |
2179 | default: |
2180 | break; | |
2181 | } | |
3f8e211f | 2182 | |
3bd1e081 | 2183 | end_nosignal: |
4cbc1a04 DG |
2184 | /* |
2185 | * Return 1 to indicate success since the 0 value can be a socket | |
2186 | * shutdown during the recv() or send() call. | |
2187 | */ | |
f3a1fc7b JG |
2188 | ret = 1; |
2189 | goto end; | |
ffe60014 DG |
2190 | |
2191 | end_msg_sessiond: | |
2192 | /* | |
2193 | * The returned value here is not useful since either way we'll return 1 to | |
2194 | * the caller because the session daemon socket management is done | |
2195 | * elsewhere. Returning a negative code or 0 will shutdown the consumer. | |
2196 | */ | |
489f70e9 MD |
2197 | ret = consumer_send_status_msg(sock, ret_code); |
2198 | if (ret < 0) { | |
2199 | goto error_fatal; | |
2200 | } | |
f3a1fc7b JG |
2201 | ret = 1; |
2202 | goto end; | |
9ce5646a | 2203 | |
ffe60014 DG |
2204 | end_channel_error: |
2205 | if (channel) { | |
2206 | /* | |
2207 | * Free channel here since no one has a reference to it. We don't | |
2208 | * free after that because a stream can store this pointer. | |
2209 | */ | |
2210 | destroy_channel(channel); | |
2211 | } | |
2212 | /* We have to send a status channel message indicating an error. */ | |
2213 | ret = consumer_send_status_channel(sock, NULL); | |
2214 | if (ret < 0) { | |
2215 | /* Stop everything if session daemon can not be notified. */ | |
2216 | goto error_fatal; | |
2217 | } | |
f3a1fc7b JG |
2218 | ret = 1; |
2219 | goto end; | |
9ce5646a | 2220 | |
ffe60014 | 2221 | error_fatal: |
ffe60014 | 2222 | /* This will issue a consumer stop. */ |
f3a1fc7b JG |
2223 | ret = -1; |
2224 | goto end; | |
2225 | ||
2226 | end: | |
2227 | rcu_read_unlock(); | |
2228 | health_code_update(); | |
2229 | return ret; | |
3bd1e081 MD |
2230 | } |
2231 | ||
fc6d7a51 JD |
2232 | void lttng_ustctl_flush_buffer(struct lttng_consumer_stream *stream, |
2233 | int producer_active) | |
2234 | { | |
2235 | assert(stream); | |
2236 | assert(stream->ustream); | |
2237 | ||
2238 | ustctl_flush_buffer(stream->ustream, producer_active); | |
2239 | } | |
2240 | ||
ffe60014 | 2241 | /* |
e9404c27 | 2242 | * Take a snapshot for a specific stream. |
ffe60014 DG |
2243 | * |
2244 | * Returns 0 on success, < 0 on error | |
2245 | */ | |
2246 | int lttng_ustconsumer_take_snapshot(struct lttng_consumer_stream *stream) | |
3bd1e081 | 2247 | { |
ffe60014 DG |
2248 | assert(stream); |
2249 | assert(stream->ustream); | |
2250 | ||
2251 | return ustctl_snapshot(stream->ustream); | |
3bd1e081 MD |
2252 | } |
2253 | ||
e9404c27 JG |
2254 | /* |
2255 | * Sample consumed and produced positions for a specific stream. | |
2256 | * | |
2257 | * Returns 0 on success, < 0 on error. | |
2258 | */ | |
2259 | int lttng_ustconsumer_sample_snapshot_positions( | |
2260 | struct lttng_consumer_stream *stream) | |
2261 | { | |
2262 | assert(stream); | |
2263 | assert(stream->ustream); | |
2264 | ||
2265 | return ustctl_snapshot_sample_positions(stream->ustream); | |
2266 | } | |
2267 | ||
ffe60014 DG |
2268 | /* |
2269 | * Get the produced position | |
2270 | * | |
2271 | * Returns 0 on success, < 0 on error | |
2272 | */ | |
2273 | int lttng_ustconsumer_get_produced_snapshot( | |
2274 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
3bd1e081 | 2275 | { |
ffe60014 DG |
2276 | assert(stream); |
2277 | assert(stream->ustream); | |
2278 | assert(pos); | |
7a57cf92 | 2279 | |
ffe60014 DG |
2280 | return ustctl_snapshot_get_produced(stream->ustream, pos); |
2281 | } | |
7a57cf92 | 2282 | |
10a50311 JD |
2283 | /* |
2284 | * Get the consumed position | |
2285 | * | |
2286 | * Returns 0 on success, < 0 on error | |
2287 | */ | |
2288 | int lttng_ustconsumer_get_consumed_snapshot( | |
2289 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
2290 | { | |
2291 | assert(stream); | |
2292 | assert(stream->ustream); | |
2293 | assert(pos); | |
2294 | ||
2295 | return ustctl_snapshot_get_consumed(stream->ustream, pos); | |
2296 | } | |
2297 | ||
84a182ce DG |
2298 | void lttng_ustconsumer_flush_buffer(struct lttng_consumer_stream *stream, |
2299 | int producer) | |
2300 | { | |
2301 | assert(stream); | |
2302 | assert(stream->ustream); | |
2303 | ||
2304 | ustctl_flush_buffer(stream->ustream, producer); | |
2305 | } | |
2306 | ||
214f70e0 JR |
2307 | void lttng_ustconsumer_clear_buffer(struct lttng_consumer_stream *stream) |
2308 | { | |
2309 | assert(stream); | |
2310 | assert(stream->ustream); | |
2311 | ||
2312 | ustctl_clear_buffer(stream->ustream); | |
2313 | } | |
2314 | ||
84a182ce DG |
2315 | int lttng_ustconsumer_get_current_timestamp( |
2316 | struct lttng_consumer_stream *stream, uint64_t *ts) | |
2317 | { | |
2318 | assert(stream); | |
2319 | assert(stream->ustream); | |
2320 | assert(ts); | |
2321 | ||
2322 | return ustctl_get_current_timestamp(stream->ustream, ts); | |
2323 | } | |
2324 | ||
fb83fe64 JD |
2325 | int lttng_ustconsumer_get_sequence_number( |
2326 | struct lttng_consumer_stream *stream, uint64_t *seq) | |
2327 | { | |
2328 | assert(stream); | |
2329 | assert(stream->ustream); | |
2330 | assert(seq); | |
2331 | ||
2332 | return ustctl_get_sequence_number(stream->ustream, seq); | |
2333 | } | |
2334 | ||
ffe60014 | 2335 | /* |
0dd01979 | 2336 | * Called when the stream signals the consumer that it has hung up. |
ffe60014 DG |
2337 | */ |
2338 | void lttng_ustconsumer_on_stream_hangup(struct lttng_consumer_stream *stream) | |
2339 | { | |
2340 | assert(stream); | |
2341 | assert(stream->ustream); | |
2c1dd183 | 2342 | |
0dd01979 MD |
2343 | pthread_mutex_lock(&stream->lock); |
2344 | if (!stream->quiescent) { | |
2345 | ustctl_flush_buffer(stream->ustream, 0); | |
2346 | stream->quiescent = true; | |
2347 | } | |
2348 | pthread_mutex_unlock(&stream->lock); | |
ffe60014 DG |
2349 | stream->hangup_flush_done = 1; |
2350 | } | |
ee77a7b0 | 2351 | |
ffe60014 DG |
2352 | void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan) |
2353 | { | |
4628484a MD |
2354 | int i; |
2355 | ||
ffe60014 DG |
2356 | assert(chan); |
2357 | assert(chan->uchan); | |
d2956687 | 2358 | assert(chan->buffer_credentials.is_set); |
e316aad5 | 2359 | |
ea88ca2a MD |
2360 | if (chan->switch_timer_enabled == 1) { |
2361 | consumer_timer_switch_stop(chan); | |
2362 | } | |
4628484a MD |
2363 | for (i = 0; i < chan->nr_stream_fds; i++) { |
2364 | int ret; | |
2365 | ||
2366 | ret = close(chan->stream_fds[i]); | |
2367 | if (ret) { | |
2368 | PERROR("close"); | |
2369 | } | |
2370 | if (chan->shm_path[0]) { | |
2371 | char shm_path[PATH_MAX]; | |
2372 | ||
2373 | ret = get_stream_shm_path(shm_path, chan->shm_path, i); | |
2374 | if (ret) { | |
2375 | ERR("Cannot get stream shm path"); | |
2376 | } | |
d2956687 JG |
2377 | ret = run_as_unlink(shm_path, |
2378 | chan->buffer_credentials.value.uid, | |
2379 | chan->buffer_credentials.value.gid); | |
4628484a | 2380 | if (ret) { |
4628484a MD |
2381 | PERROR("unlink %s", shm_path); |
2382 | } | |
2383 | } | |
2384 | } | |
3bd1e081 MD |
2385 | } |
2386 | ||
b83e03c4 MD |
2387 | void lttng_ustconsumer_free_channel(struct lttng_consumer_channel *chan) |
2388 | { | |
2389 | assert(chan); | |
2390 | assert(chan->uchan); | |
d2956687 | 2391 | assert(chan->buffer_credentials.is_set); |
b83e03c4 MD |
2392 | |
2393 | consumer_metadata_cache_destroy(chan); | |
2394 | ustctl_destroy_channel(chan->uchan); | |
ea853771 JR |
2395 | /* Try to rmdir all directories under shm_path root. */ |
2396 | if (chan->root_shm_path[0]) { | |
602766ec | 2397 | (void) run_as_rmdir_recursive(chan->root_shm_path, |
d2956687 | 2398 | chan->buffer_credentials.value.uid, |
f75c5439 MD |
2399 | chan->buffer_credentials.value.gid, |
2400 | LTTNG_DIRECTORY_HANDLE_SKIP_NON_EMPTY_FLAG); | |
ea853771 | 2401 | } |
b83e03c4 MD |
2402 | free(chan->stream_fds); |
2403 | } | |
2404 | ||
3bd1e081 MD |
2405 | void lttng_ustconsumer_del_stream(struct lttng_consumer_stream *stream) |
2406 | { | |
ffe60014 DG |
2407 | assert(stream); |
2408 | assert(stream->ustream); | |
d41f73b7 | 2409 | |
ea88ca2a MD |
2410 | if (stream->chan->switch_timer_enabled == 1) { |
2411 | consumer_timer_switch_stop(stream->chan); | |
2412 | } | |
ffe60014 DG |
2413 | ustctl_destroy_stream(stream->ustream); |
2414 | } | |
d41f73b7 | 2415 | |
6d574024 DG |
2416 | int lttng_ustconsumer_get_wakeup_fd(struct lttng_consumer_stream *stream) |
2417 | { | |
2418 | assert(stream); | |
2419 | assert(stream->ustream); | |
2420 | ||
2421 | return ustctl_stream_get_wakeup_fd(stream->ustream); | |
2422 | } | |
2423 | ||
2424 | int lttng_ustconsumer_close_wakeup_fd(struct lttng_consumer_stream *stream) | |
2425 | { | |
2426 | assert(stream); | |
2427 | assert(stream->ustream); | |
2428 | ||
2429 | return ustctl_stream_close_wakeup_fd(stream->ustream); | |
2430 | } | |
2431 | ||
93ec662e | 2432 | static |
6f9449c2 | 2433 | void metadata_stream_reset_cache(struct lttng_consumer_stream *stream) |
93ec662e | 2434 | { |
6f9449c2 JG |
2435 | DBG("Reset metadata cache of session %" PRIu64, |
2436 | stream->chan->session_id); | |
93ec662e | 2437 | stream->ust_metadata_pushed = 0; |
6f9449c2 | 2438 | stream->metadata_version = stream->chan->metadata_cache->version; |
93ec662e JD |
2439 | stream->reset_metadata_flag = 1; |
2440 | } | |
2441 | ||
94d49140 JD |
2442 | /* |
2443 | * Write up to one packet from the metadata cache to the channel. | |
2444 | * | |
2445 | * Returns the number of bytes pushed in the cache, or a negative value | |
2446 | * on error. | |
2447 | */ | |
2448 | static | |
2449 | int commit_one_metadata_packet(struct lttng_consumer_stream *stream) | |
2450 | { | |
2451 | ssize_t write_len; | |
2452 | int ret; | |
2453 | ||
2454 | pthread_mutex_lock(&stream->chan->metadata_cache->lock); | |
c585821b | 2455 | if (stream->chan->metadata_cache->max_offset |
94d49140 JD |
2456 | == stream->ust_metadata_pushed) { |
2457 | ret = 0; | |
2458 | goto end; | |
2459 | } | |
2460 | ||
2461 | write_len = ustctl_write_one_packet_to_channel(stream->chan->uchan, | |
2462 | &stream->chan->metadata_cache->data[stream->ust_metadata_pushed], | |
c585821b | 2463 | stream->chan->metadata_cache->max_offset |
94d49140 JD |
2464 | - stream->ust_metadata_pushed); |
2465 | assert(write_len != 0); | |
2466 | if (write_len < 0) { | |
2467 | ERR("Writing one metadata packet"); | |
f5ba75b4 | 2468 | ret = write_len; |
94d49140 JD |
2469 | goto end; |
2470 | } | |
2471 | stream->ust_metadata_pushed += write_len; | |
2472 | ||
c585821b | 2473 | assert(stream->chan->metadata_cache->max_offset >= |
94d49140 JD |
2474 | stream->ust_metadata_pushed); |
2475 | ret = write_len; | |
2476 | ||
0d88e046 JG |
2477 | /* |
2478 | * Switch packet (but don't open the next one) on every commit of | |
2479 | * a metadata packet. Since the subbuffer is fully filled (with padding, | |
2480 | * if needed), the stream is "quiescent" after this commit. | |
2481 | */ | |
2482 | ustctl_flush_buffer(stream->ustream, 1); | |
2483 | stream->quiescent = true; | |
94d49140 JD |
2484 | end: |
2485 | pthread_mutex_unlock(&stream->chan->metadata_cache->lock); | |
2486 | return ret; | |
2487 | } | |
2488 | ||
309167d2 | 2489 | |
94d49140 JD |
2490 | /* |
2491 | * Sync metadata meaning request them to the session daemon and snapshot to the | |
2492 | * metadata thread can consumer them. | |
2493 | * | |
c585821b MD |
2494 | * Metadata stream lock is held here, but we need to release it when |
2495 | * interacting with sessiond, else we cause a deadlock with live | |
2496 | * awaiting on metadata to be pushed out. | |
94d49140 | 2497 | * |
cdb72e4e JG |
2498 | * The RCU read side lock must be held by the caller. |
2499 | * | |
94d49140 JD |
2500 | * Return 0 if new metadatda is available, EAGAIN if the metadata stream |
2501 | * is empty or a negative value on error. | |
2502 | */ | |
2503 | int lttng_ustconsumer_sync_metadata(struct lttng_consumer_local_data *ctx, | |
cdb72e4e | 2504 | struct lttng_consumer_stream *metadata_stream) |
94d49140 JD |
2505 | { |
2506 | int ret; | |
2507 | int retry = 0; | |
cdb72e4e | 2508 | struct lttng_consumer_channel *metadata_channel; |
94d49140 JD |
2509 | |
2510 | assert(ctx); | |
cdb72e4e | 2511 | assert(metadata_stream); |
94d49140 | 2512 | |
cdb72e4e JG |
2513 | metadata_channel = metadata_stream->chan; |
2514 | pthread_mutex_unlock(&metadata_stream->lock); | |
94d49140 JD |
2515 | /* |
2516 | * Request metadata from the sessiond, but don't wait for the flush | |
2517 | * because we locked the metadata thread. | |
2518 | */ | |
cdb72e4e JG |
2519 | ret = lttng_ustconsumer_request_metadata(ctx, metadata_channel, 0, 0); |
2520 | pthread_mutex_lock(&metadata_stream->lock); | |
94d49140 JD |
2521 | if (ret < 0) { |
2522 | goto end; | |
2523 | } | |
2524 | ||
cdb72e4e JG |
2525 | /* |
2526 | * The metadata stream and channel can be deleted while the | |
2527 | * metadata stream lock was released. The streamed is checked | |
2528 | * for deletion before we use it further. | |
2529 | * | |
2530 | * Note that it is safe to access a logically-deleted stream since its | |
2531 | * existence is still guaranteed by the RCU read side lock. However, | |
2532 | * it should no longer be used. The close/deletion of the metadata | |
2533 | * channel and stream already guarantees that all metadata has been | |
2534 | * consumed. Therefore, there is nothing left to do in this function. | |
2535 | */ | |
2536 | if (consumer_stream_is_deleted(metadata_stream)) { | |
2537 | DBG("Metadata stream %" PRIu64 " was deleted during the metadata synchronization", | |
2538 | metadata_stream->key); | |
2539 | ret = 0; | |
2540 | goto end; | |
2541 | } | |
2542 | ||
2543 | ret = commit_one_metadata_packet(metadata_stream); | |
94d49140 JD |
2544 | if (ret <= 0) { |
2545 | goto end; | |
2546 | } else if (ret > 0) { | |
2547 | retry = 1; | |
2548 | } | |
2549 | ||
cdb72e4e | 2550 | ret = ustctl_snapshot(metadata_stream->ustream); |
94d49140 JD |
2551 | if (ret < 0) { |
2552 | if (errno != EAGAIN) { | |
2553 | ERR("Sync metadata, taking UST snapshot"); | |
2554 | goto end; | |
2555 | } | |
2556 | DBG("No new metadata when syncing them."); | |
2557 | /* No new metadata, exit. */ | |
2558 | ret = ENODATA; | |
2559 | goto end; | |
2560 | } | |
2561 | ||
2562 | /* | |
2563 | * After this flush, we still need to extract metadata. | |
2564 | */ | |
2565 | if (retry) { | |
2566 | ret = EAGAIN; | |
2567 | } | |
2568 | ||
2569 | end: | |
2570 | return ret; | |
2571 | } | |
2572 | ||
02b3d176 DG |
2573 | /* |
2574 | * Return 0 on success else a negative value. | |
2575 | */ | |
2576 | static int notify_if_more_data(struct lttng_consumer_stream *stream, | |
2577 | struct lttng_consumer_local_data *ctx) | |
2578 | { | |
2579 | int ret; | |
2580 | struct ustctl_consumer_stream *ustream; | |
2581 | ||
2582 | assert(stream); | |
2583 | assert(ctx); | |
2584 | ||
2585 | ustream = stream->ustream; | |
2586 | ||
2587 | /* | |
2588 | * First, we are going to check if there is a new subbuffer available | |
2589 | * before reading the stream wait_fd. | |
2590 | */ | |
2591 | /* Get the next subbuffer */ | |
2592 | ret = ustctl_get_next_subbuf(ustream); | |
2593 | if (ret) { | |
2594 | /* No more data found, flag the stream. */ | |
2595 | stream->has_data = 0; | |
2596 | ret = 0; | |
2597 | goto end; | |
2598 | } | |
2599 | ||
5420e5db | 2600 | ret = ustctl_put_subbuf(ustream); |
02b3d176 DG |
2601 | assert(!ret); |
2602 | ||
2603 | /* This stream still has data. Flag it and wake up the data thread. */ | |
2604 | stream->has_data = 1; | |
2605 | ||
2606 | if (stream->monitor && !stream->hangup_flush_done && !ctx->has_wakeup) { | |
2607 | ssize_t writelen; | |
2608 | ||
2609 | writelen = lttng_pipe_write(ctx->consumer_wakeup_pipe, "!", 1); | |
2610 | if (writelen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) { | |
2611 | ret = writelen; | |
2612 | goto end; | |
2613 | } | |
2614 | ||
2615 | /* The wake up pipe has been notified. */ | |
2616 | ctx->has_wakeup = 1; | |
2617 | } | |
2618 | ret = 0; | |
2619 | ||
2620 | end: | |
2621 | return ret; | |
2622 | } | |
2623 | ||
6f9449c2 | 2624 | static int consumer_stream_ust_on_wake_up(struct lttng_consumer_stream *stream) |
fb83fe64 | 2625 | { |
6f9449c2 | 2626 | int ret = 0; |
fb83fe64 | 2627 | |
fb83fe64 | 2628 | /* |
6f9449c2 JG |
2629 | * We can consume the 1 byte written into the wait_fd by |
2630 | * UST. Don't trigger error if we cannot read this one byte | |
2631 | * (read returns 0), or if the error is EAGAIN or EWOULDBLOCK. | |
2632 | * | |
2633 | * This is only done when the stream is monitored by a thread, | |
2634 | * before the flush is done after a hangup and if the stream | |
2635 | * is not flagged with data since there might be nothing to | |
2636 | * consume in the wait fd but still have data available | |
2637 | * flagged by the consumer wake up pipe. | |
fb83fe64 | 2638 | */ |
6f9449c2 JG |
2639 | if (stream->monitor && !stream->hangup_flush_done && !stream->has_data) { |
2640 | char dummy; | |
2641 | ssize_t readlen; | |
2642 | ||
2643 | readlen = lttng_read(stream->wait_fd, &dummy, 1); | |
2644 | if (readlen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) { | |
2645 | ret = readlen; | |
2646 | } | |
fb83fe64 | 2647 | } |
fb83fe64 | 2648 | |
6f9449c2 JG |
2649 | return ret; |
2650 | } | |
2651 | ||
2652 | static int extract_common_subbuffer_info(struct lttng_consumer_stream *stream, | |
2653 | struct stream_subbuffer *subbuf) | |
2654 | { | |
2655 | int ret; | |
2656 | ||
2657 | ret = ustctl_get_subbuf_size( | |
2658 | stream->ustream, &subbuf->info.data.subbuf_size); | |
2659 | if (ret) { | |
fb83fe64 JD |
2660 | goto end; |
2661 | } | |
6f9449c2 JG |
2662 | |
2663 | ret = ustctl_get_padded_subbuf_size( | |
2664 | stream->ustream, &subbuf->info.data.padded_subbuf_size); | |
2665 | if (ret) { | |
2666 | goto end; | |
fb83fe64 | 2667 | } |
fb83fe64 JD |
2668 | |
2669 | end: | |
2670 | return ret; | |
2671 | } | |
2672 | ||
6f9449c2 JG |
2673 | static int extract_metadata_subbuffer_info(struct lttng_consumer_stream *stream, |
2674 | struct stream_subbuffer *subbuf) | |
d41f73b7 | 2675 | { |
6f9449c2 | 2676 | int ret; |
ffe60014 | 2677 | |
6f9449c2 JG |
2678 | ret = extract_common_subbuffer_info(stream, subbuf); |
2679 | if (ret) { | |
2680 | goto end; | |
2681 | } | |
d41f73b7 | 2682 | |
6f9449c2 | 2683 | subbuf->info.metadata.version = stream->chan->metadata_cache->version; |
ffe60014 | 2684 | |
6f9449c2 JG |
2685 | end: |
2686 | return ret; | |
2687 | } | |
d41f73b7 | 2688 | |
6f9449c2 JG |
2689 | static int extract_data_subbuffer_info(struct lttng_consumer_stream *stream, |
2690 | struct stream_subbuffer *subbuf) | |
2691 | { | |
2692 | int ret; | |
c617c0c6 | 2693 | |
6f9449c2 JG |
2694 | ret = extract_common_subbuffer_info(stream, subbuf); |
2695 | if (ret) { | |
2696 | goto end; | |
02d02e31 JD |
2697 | } |
2698 | ||
6f9449c2 JG |
2699 | ret = ustctl_get_packet_size( |
2700 | stream->ustream, &subbuf->info.data.packet_size); | |
2701 | if (ret < 0) { | |
2702 | PERROR("Failed to get sub-buffer packet size"); | |
2703 | goto end; | |
2704 | } | |
04ef1097 | 2705 | |
6f9449c2 JG |
2706 | ret = ustctl_get_content_size( |
2707 | stream->ustream, &subbuf->info.data.content_size); | |
2708 | if (ret < 0) { | |
2709 | PERROR("Failed to get sub-buffer content size"); | |
2710 | goto end; | |
d41f73b7 | 2711 | } |
309167d2 | 2712 | |
6f9449c2 JG |
2713 | ret = ustctl_get_timestamp_begin( |
2714 | stream->ustream, &subbuf->info.data.timestamp_begin); | |
2715 | if (ret < 0) { | |
2716 | PERROR("Failed to get sub-buffer begin timestamp"); | |
2717 | goto end; | |
2718 | } | |
fb83fe64 | 2719 | |
6f9449c2 JG |
2720 | ret = ustctl_get_timestamp_end( |
2721 | stream->ustream, &subbuf->info.data.timestamp_end); | |
2722 | if (ret < 0) { | |
2723 | PERROR("Failed to get sub-buffer end timestamp"); | |
2724 | goto end; | |
2725 | } | |
2726 | ||
2727 | ret = ustctl_get_events_discarded( | |
2728 | stream->ustream, &subbuf->info.data.events_discarded); | |
2729 | if (ret) { | |
2730 | PERROR("Failed to get sub-buffer events discarded count"); | |
2731 | goto end; | |
2732 | } | |
2733 | ||
2734 | ret = ustctl_get_sequence_number(stream->ustream, | |
2735 | &subbuf->info.data.sequence_number.value); | |
2736 | if (ret) { | |
2737 | /* May not be supported by older LTTng-modules. */ | |
2738 | if (ret != -ENOTTY) { | |
2739 | PERROR("Failed to get sub-buffer sequence number"); | |
2740 | goto end; | |
fb83fe64 | 2741 | } |
1c20f0e2 | 2742 | } else { |
6f9449c2 | 2743 | subbuf->info.data.sequence_number.is_set = true; |
309167d2 JD |
2744 | } |
2745 | ||
6f9449c2 JG |
2746 | ret = ustctl_get_stream_id( |
2747 | stream->ustream, &subbuf->info.data.stream_id); | |
2748 | if (ret < 0) { | |
2749 | PERROR("Failed to get stream id"); | |
2750 | goto end; | |
2751 | } | |
1d4dfdef | 2752 | |
6f9449c2 JG |
2753 | ret = ustctl_get_instance_id(stream->ustream, |
2754 | &subbuf->info.data.stream_instance_id.value); | |
2755 | if (ret) { | |
2756 | /* May not be supported by older LTTng-modules. */ | |
2757 | if (ret != -ENOTTY) { | |
2758 | PERROR("Failed to get stream instance id"); | |
2759 | goto end; | |
2760 | } | |
2761 | } else { | |
2762 | subbuf->info.data.stream_instance_id.is_set = true; | |
2763 | } | |
2764 | end: | |
2765 | return ret; | |
2766 | } | |
1d4dfdef | 2767 | |
6f9449c2 JG |
2768 | static int get_next_subbuffer_common(struct lttng_consumer_stream *stream, |
2769 | struct stream_subbuffer *subbuffer) | |
2770 | { | |
2771 | int ret; | |
2772 | const char *addr; | |
1d4dfdef | 2773 | |
6f9449c2 JG |
2774 | ret = stream->read_subbuffer_ops.extract_subbuffer_info( |
2775 | stream, subbuffer); | |
2776 | if (ret) { | |
2777 | goto end; | |
2778 | } | |
02d02e31 | 2779 | |
6f9449c2 | 2780 | ret = get_current_subbuf_addr(stream, &addr); |
128708c3 | 2781 | if (ret) { |
6f9449c2 | 2782 | goto end; |
128708c3 JG |
2783 | } |
2784 | ||
6f9449c2 JG |
2785 | subbuffer->buffer.buffer = lttng_buffer_view_init( |
2786 | addr, 0, subbuffer->info.data.padded_subbuf_size); | |
2787 | assert(subbuffer->buffer.buffer.data != NULL); | |
2788 | end: | |
2789 | return ret; | |
2790 | } | |
fd424d99 | 2791 | |
6f9449c2 JG |
2792 | static int get_next_subbuffer(struct lttng_consumer_stream *stream, |
2793 | struct stream_subbuffer *subbuffer) | |
2794 | { | |
2795 | int ret; | |
331744e3 | 2796 | |
6f9449c2 JG |
2797 | ret = ustctl_get_next_subbuf(stream->ustream); |
2798 | if (ret) { | |
2799 | goto end; | |
02b3d176 DG |
2800 | } |
2801 | ||
6f9449c2 JG |
2802 | ret = get_next_subbuffer_common(stream, subbuffer); |
2803 | if (ret) { | |
23d56598 | 2804 | goto end; |
1c20f0e2 | 2805 | } |
6f9449c2 JG |
2806 | end: |
2807 | return ret; | |
2808 | } | |
1c20f0e2 | 2809 | |
6f9449c2 JG |
2810 | static int get_next_subbuffer_metadata(struct lttng_consumer_stream *stream, |
2811 | struct stream_subbuffer *subbuffer) | |
2812 | { | |
2813 | int ret; | |
f5ba75b4 JG |
2814 | bool cache_empty; |
2815 | bool got_subbuffer; | |
2816 | bool coherent; | |
2817 | bool buffer_empty; | |
2818 | unsigned long consumed_pos, produced_pos; | |
6f9449c2 | 2819 | |
f5ba75b4 JG |
2820 | do { |
2821 | ret = ustctl_get_next_subbuf(stream->ustream); | |
2822 | if (ret == 0) { | |
2823 | got_subbuffer = true; | |
2824 | } else { | |
2825 | got_subbuffer = false; | |
2826 | if (ret != -EAGAIN) { | |
2827 | /* Fatal error. */ | |
2828 | goto end; | |
2829 | } | |
c585821b MD |
2830 | } |
2831 | ||
f5ba75b4 JG |
2832 | /* |
2833 | * Determine if the cache is empty and ensure that a sub-buffer | |
2834 | * is made available if the cache is not empty. | |
2835 | */ | |
2836 | if (!got_subbuffer) { | |
2837 | ret = commit_one_metadata_packet(stream); | |
2838 | if (ret < 0 && ret != -ENOBUFS) { | |
2839 | goto end; | |
2840 | } else if (ret == 0) { | |
2841 | /* Not an error, the cache is empty. */ | |
2842 | cache_empty = true; | |
2843 | ret = -ENODATA; | |
2844 | goto end; | |
2845 | } else { | |
2846 | cache_empty = false; | |
2847 | } | |
2848 | } else { | |
2849 | pthread_mutex_lock(&stream->chan->metadata_cache->lock); | |
2850 | cache_empty = stream->chan->metadata_cache->max_offset == | |
2851 | stream->ust_metadata_pushed; | |
2852 | pthread_mutex_unlock(&stream->chan->metadata_cache->lock); | |
94d49140 | 2853 | } |
f5ba75b4 | 2854 | } while (!got_subbuffer); |
94d49140 | 2855 | |
f5ba75b4 | 2856 | /* Populate sub-buffer infos and view. */ |
6f9449c2 JG |
2857 | ret = get_next_subbuffer_common(stream, subbuffer); |
2858 | if (ret) { | |
2859 | goto end; | |
309167d2 | 2860 | } |
f5ba75b4 JG |
2861 | |
2862 | ret = lttng_ustconsumer_sample_snapshot_positions(stream); | |
2863 | if (ret < 0) { | |
2864 | /* | |
2865 | * -EAGAIN is not expected since we got a sub-buffer and haven't | |
2866 | * pushed the consumption position yet (on put_next). | |
2867 | */ | |
2868 | PERROR("Failed to take a snapshot of metadata buffer positions"); | |
2869 | goto end; | |
2870 | } | |
2871 | ||
2872 | ret = lttng_ustconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
2873 | if (ret) { | |
2874 | PERROR("Failed to get metadata consumed position"); | |
2875 | goto end; | |
2876 | } | |
2877 | ||
2878 | ret = lttng_ustconsumer_get_produced_snapshot(stream, &produced_pos); | |
2879 | if (ret) { | |
2880 | PERROR("Failed to get metadata produced position"); | |
2881 | goto end; | |
2882 | } | |
2883 | ||
2884 | /* Last sub-buffer of the ring buffer ? */ | |
2885 | buffer_empty = (consumed_pos + stream->max_sb_size) == produced_pos; | |
2886 | ||
2887 | /* | |
2888 | * The sessiond registry lock ensures that coherent units of metadata | |
2889 | * are pushed to the consumer daemon at once. Hence, if a sub-buffer is | |
2890 | * acquired, the cache is empty, and it is the only available sub-buffer | |
2891 | * available, it is safe to assume that it is "coherent". | |
2892 | */ | |
2893 | coherent = got_subbuffer && cache_empty && buffer_empty; | |
2894 | ||
2895 | LTTNG_OPTIONAL_SET(&subbuffer->info.metadata.coherent, coherent); | |
23d56598 | 2896 | end: |
d41f73b7 MD |
2897 | return ret; |
2898 | } | |
2899 | ||
6f9449c2 JG |
2900 | static int put_next_subbuffer(struct lttng_consumer_stream *stream, |
2901 | struct stream_subbuffer *subbuffer) | |
2902 | { | |
2903 | const int ret = ustctl_put_next_subbuf(stream->ustream); | |
2904 | ||
2905 | assert(ret == 0); | |
2906 | return ret; | |
2907 | } | |
2908 | ||
2909 | static int signal_metadata(struct lttng_consumer_stream *stream, | |
2910 | struct lttng_consumer_local_data *ctx) | |
2911 | { | |
2912 | return pthread_cond_broadcast(&stream->metadata_rdv) ? -errno : 0; | |
2913 | } | |
2914 | ||
f5ba75b4 | 2915 | static int lttng_ustconsumer_set_stream_ops( |
6f9449c2 JG |
2916 | struct lttng_consumer_stream *stream) |
2917 | { | |
f5ba75b4 JG |
2918 | int ret = 0; |
2919 | ||
6f9449c2 JG |
2920 | stream->read_subbuffer_ops.on_wake_up = consumer_stream_ust_on_wake_up; |
2921 | if (stream->metadata_flag) { | |
2922 | stream->read_subbuffer_ops.get_next_subbuffer = | |
2923 | get_next_subbuffer_metadata; | |
2924 | stream->read_subbuffer_ops.extract_subbuffer_info = | |
2925 | extract_metadata_subbuffer_info; | |
2926 | stream->read_subbuffer_ops.reset_metadata = | |
2927 | metadata_stream_reset_cache; | |
f5ba75b4 JG |
2928 | if (stream->chan->is_live) { |
2929 | stream->read_subbuffer_ops.on_sleep = signal_metadata; | |
2930 | ret = consumer_stream_enable_metadata_bucketization( | |
2931 | stream); | |
2932 | if (ret) { | |
2933 | goto end; | |
2934 | } | |
2935 | } | |
6f9449c2 JG |
2936 | } else { |
2937 | stream->read_subbuffer_ops.get_next_subbuffer = | |
2938 | get_next_subbuffer; | |
2939 | stream->read_subbuffer_ops.extract_subbuffer_info = | |
2940 | extract_data_subbuffer_info; | |
2941 | stream->read_subbuffer_ops.on_sleep = notify_if_more_data; | |
2942 | if (stream->chan->is_live) { | |
2943 | stream->read_subbuffer_ops.send_live_beacon = | |
2944 | consumer_flush_ust_index; | |
2945 | } | |
2946 | } | |
2947 | ||
2948 | stream->read_subbuffer_ops.put_next_subbuffer = put_next_subbuffer; | |
f5ba75b4 JG |
2949 | end: |
2950 | return ret; | |
6f9449c2 JG |
2951 | } |
2952 | ||
ffe60014 DG |
2953 | /* |
2954 | * Called when a stream is created. | |
fe4477ee JD |
2955 | * |
2956 | * Return 0 on success or else a negative value. | |
ffe60014 | 2957 | */ |
d41f73b7 MD |
2958 | int lttng_ustconsumer_on_recv_stream(struct lttng_consumer_stream *stream) |
2959 | { | |
fe4477ee JD |
2960 | int ret; |
2961 | ||
10a50311 JD |
2962 | assert(stream); |
2963 | ||
d2956687 JG |
2964 | /* |
2965 | * Don't create anything if this is set for streaming or if there is | |
2966 | * no current trace chunk on the parent channel. | |
2967 | */ | |
2968 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor && | |
2969 | stream->chan->trace_chunk) { | |
2970 | ret = consumer_stream_create_output_files(stream, true); | |
2971 | if (ret) { | |
fe4477ee JD |
2972 | goto error; |
2973 | } | |
fe4477ee | 2974 | } |
6f9449c2 JG |
2975 | |
2976 | lttng_ustconsumer_set_stream_ops(stream); | |
fe4477ee JD |
2977 | ret = 0; |
2978 | ||
2979 | error: | |
2980 | return ret; | |
d41f73b7 | 2981 | } |
ca22feea DG |
2982 | |
2983 | /* | |
2984 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
2985 | * stream. Consumer data lock MUST be acquired before calling this function |
2986 | * and the stream lock. | |
ca22feea | 2987 | * |
6d805429 | 2988 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
2989 | * data is available for trace viewer reading. |
2990 | */ | |
6d805429 | 2991 | int lttng_ustconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
2992 | { |
2993 | int ret; | |
2994 | ||
2995 | assert(stream); | |
ffe60014 | 2996 | assert(stream->ustream); |
ca22feea | 2997 | |
6d805429 | 2998 | DBG("UST consumer checking data pending"); |
c8f59ee5 | 2999 | |
ca6b395f MD |
3000 | if (stream->endpoint_status != CONSUMER_ENDPOINT_ACTIVE) { |
3001 | ret = 0; | |
3002 | goto end; | |
3003 | } | |
3004 | ||
04ef1097 | 3005 | if (stream->chan->type == CONSUMER_CHANNEL_TYPE_METADATA) { |
e6ee4eab DG |
3006 | uint64_t contiguous, pushed; |
3007 | ||
3008 | /* Ease our life a bit. */ | |
c585821b | 3009 | contiguous = stream->chan->metadata_cache->max_offset; |
e6ee4eab DG |
3010 | pushed = stream->ust_metadata_pushed; |
3011 | ||
04ef1097 MD |
3012 | /* |
3013 | * We can simply check whether all contiguously available data | |
3014 | * has been pushed to the ring buffer, since the push operation | |
3015 | * is performed within get_next_subbuf(), and because both | |
3016 | * get_next_subbuf() and put_next_subbuf() are issued atomically | |
3017 | * thanks to the stream lock within | |
3018 | * lttng_ustconsumer_read_subbuffer(). This basically means that | |
3019 | * whetnever ust_metadata_pushed is incremented, the associated | |
3020 | * metadata has been consumed from the metadata stream. | |
3021 | */ | |
3022 | DBG("UST consumer metadata pending check: contiguous %" PRIu64 " vs pushed %" PRIu64, | |
e6ee4eab | 3023 | contiguous, pushed); |
aa01b94c | 3024 | assert(((int64_t) (contiguous - pushed)) >= 0); |
e6ee4eab | 3025 | if ((contiguous != pushed) || |
6acdf328 | 3026 | (((int64_t) contiguous - pushed) > 0 || contiguous == 0)) { |
04ef1097 MD |
3027 | ret = 1; /* Data is pending */ |
3028 | goto end; | |
3029 | } | |
3030 | } else { | |
3031 | ret = ustctl_get_next_subbuf(stream->ustream); | |
3032 | if (ret == 0) { | |
3033 | /* | |
3034 | * There is still data so let's put back this | |
3035 | * subbuffer. | |
3036 | */ | |
3037 | ret = ustctl_put_subbuf(stream->ustream); | |
3038 | assert(ret == 0); | |
3039 | ret = 1; /* Data is pending */ | |
3040 | goto end; | |
3041 | } | |
ca22feea DG |
3042 | } |
3043 | ||
6d805429 DG |
3044 | /* Data is NOT pending so ready to be read. */ |
3045 | ret = 0; | |
ca22feea | 3046 | |
6efae65e DG |
3047 | end: |
3048 | return ret; | |
ca22feea | 3049 | } |
d88aee68 | 3050 | |
6d574024 DG |
3051 | /* |
3052 | * Stop a given metadata channel timer if enabled and close the wait fd which | |
3053 | * is the poll pipe of the metadata stream. | |
3054 | * | |
d2c82a5a | 3055 | * This MUST be called with the metadata channel lock acquired. |
6d574024 DG |
3056 | */ |
3057 | void lttng_ustconsumer_close_metadata(struct lttng_consumer_channel *metadata) | |
3058 | { | |
3059 | int ret; | |
3060 | ||
3061 | assert(metadata); | |
3062 | assert(metadata->type == CONSUMER_CHANNEL_TYPE_METADATA); | |
3063 | ||
3064 | DBG("Closing metadata channel key %" PRIu64, metadata->key); | |
3065 | ||
3066 | if (metadata->switch_timer_enabled == 1) { | |
3067 | consumer_timer_switch_stop(metadata); | |
3068 | } | |
3069 | ||
3070 | if (!metadata->metadata_stream) { | |
3071 | goto end; | |
3072 | } | |
3073 | ||
3074 | /* | |
3075 | * Closing write side so the thread monitoring the stream wakes up if any | |
3076 | * and clean the metadata stream. | |
3077 | */ | |
3078 | if (metadata->metadata_stream->ust_metadata_poll_pipe[1] >= 0) { | |
3079 | ret = close(metadata->metadata_stream->ust_metadata_poll_pipe[1]); | |
3080 | if (ret < 0) { | |
3081 | PERROR("closing metadata pipe write side"); | |
3082 | } | |
3083 | metadata->metadata_stream->ust_metadata_poll_pipe[1] = -1; | |
3084 | } | |
3085 | ||
3086 | end: | |
3087 | return; | |
3088 | } | |
3089 | ||
d88aee68 DG |
3090 | /* |
3091 | * Close every metadata stream wait fd of the metadata hash table. This | |
3092 | * function MUST be used very carefully so not to run into a race between the | |
3093 | * metadata thread handling streams and this function closing their wait fd. | |
3094 | * | |
3095 | * For UST, this is used when the session daemon hangs up. Its the metadata | |
3096 | * producer so calling this is safe because we are assured that no state change | |
3097 | * can occur in the metadata thread for the streams in the hash table. | |
3098 | */ | |
6d574024 | 3099 | void lttng_ustconsumer_close_all_metadata(struct lttng_ht *metadata_ht) |
d88aee68 | 3100 | { |
d88aee68 DG |
3101 | struct lttng_ht_iter iter; |
3102 | struct lttng_consumer_stream *stream; | |
3103 | ||
3104 | assert(metadata_ht); | |
3105 | assert(metadata_ht->ht); | |
3106 | ||
3107 | DBG("UST consumer closing all metadata streams"); | |
3108 | ||
3109 | rcu_read_lock(); | |
3110 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, | |
3111 | node.node) { | |
9ce5646a MD |
3112 | |
3113 | health_code_update(); | |
3114 | ||
be2b50c7 | 3115 | pthread_mutex_lock(&stream->chan->lock); |
6d574024 | 3116 | lttng_ustconsumer_close_metadata(stream->chan); |
be2b50c7 DG |
3117 | pthread_mutex_unlock(&stream->chan->lock); |
3118 | ||
d88aee68 DG |
3119 | } |
3120 | rcu_read_unlock(); | |
3121 | } | |
d8ef542d MD |
3122 | |
3123 | void lttng_ustconsumer_close_stream_wakeup(struct lttng_consumer_stream *stream) | |
3124 | { | |
3125 | int ret; | |
3126 | ||
3127 | ret = ustctl_stream_close_wakeup_fd(stream->ustream); | |
3128 | if (ret < 0) { | |
3129 | ERR("Unable to close wakeup fd"); | |
3130 | } | |
3131 | } | |
331744e3 | 3132 | |
f666ae70 MD |
3133 | /* |
3134 | * Please refer to consumer-timer.c before adding any lock within this | |
3135 | * function or any of its callees. Timers have a very strict locking | |
3136 | * semantic with respect to teardown. Failure to respect this semantic | |
3137 | * introduces deadlocks. | |
c585821b MD |
3138 | * |
3139 | * DON'T hold the metadata lock when calling this function, else this | |
3140 | * can cause deadlock involving consumer awaiting for metadata to be | |
3141 | * pushed out due to concurrent interaction with the session daemon. | |
f666ae70 | 3142 | */ |
331744e3 | 3143 | int lttng_ustconsumer_request_metadata(struct lttng_consumer_local_data *ctx, |
94d49140 | 3144 | struct lttng_consumer_channel *channel, int timer, int wait) |
331744e3 JD |
3145 | { |
3146 | struct lttcomm_metadata_request_msg request; | |
3147 | struct lttcomm_consumer_msg msg; | |
0c759fc9 | 3148 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
93ec662e | 3149 | uint64_t len, key, offset, version; |
331744e3 JD |
3150 | int ret; |
3151 | ||
3152 | assert(channel); | |
3153 | assert(channel->metadata_cache); | |
3154 | ||
53efb85a MD |
3155 | memset(&request, 0, sizeof(request)); |
3156 | ||
331744e3 JD |
3157 | /* send the metadata request to sessiond */ |
3158 | switch (consumer_data.type) { | |
3159 | case LTTNG_CONSUMER64_UST: | |
3160 | request.bits_per_long = 64; | |
3161 | break; | |
3162 | case LTTNG_CONSUMER32_UST: | |
3163 | request.bits_per_long = 32; | |
3164 | break; | |
3165 | default: | |
3166 | request.bits_per_long = 0; | |
3167 | break; | |
3168 | } | |
3169 | ||
3170 | request.session_id = channel->session_id; | |
1950109e | 3171 | request.session_id_per_pid = channel->session_id_per_pid; |
567eb353 DG |
3172 | /* |
3173 | * Request the application UID here so the metadata of that application can | |
3174 | * be sent back. The channel UID corresponds to the user UID of the session | |
3175 | * used for the rights on the stream file(s). | |
3176 | */ | |
3177 | request.uid = channel->ust_app_uid; | |
331744e3 | 3178 | request.key = channel->key; |
567eb353 | 3179 | |
1950109e | 3180 | DBG("Sending metadata request to sessiond, session id %" PRIu64 |
3e25d926 | 3181 | ", per-pid %" PRIu64 ", app UID %u and channel key %" PRIu64, |
567eb353 DG |
3182 | request.session_id, request.session_id_per_pid, request.uid, |
3183 | request.key); | |
331744e3 | 3184 | |
75d83e50 | 3185 | pthread_mutex_lock(&ctx->metadata_socket_lock); |
9ce5646a MD |
3186 | |
3187 | health_code_update(); | |
3188 | ||
331744e3 JD |
3189 | ret = lttcomm_send_unix_sock(ctx->consumer_metadata_socket, &request, |
3190 | sizeof(request)); | |
3191 | if (ret < 0) { | |
3192 | ERR("Asking metadata to sessiond"); | |
3193 | goto end; | |
3194 | } | |
3195 | ||
9ce5646a MD |
3196 | health_code_update(); |
3197 | ||
331744e3 JD |
3198 | /* Receive the metadata from sessiond */ |
3199 | ret = lttcomm_recv_unix_sock(ctx->consumer_metadata_socket, &msg, | |
3200 | sizeof(msg)); | |
3201 | if (ret != sizeof(msg)) { | |
8fd623e0 | 3202 | DBG("Consumer received unexpected message size %d (expects %zu)", |
331744e3 JD |
3203 | ret, sizeof(msg)); |
3204 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); | |
3205 | /* | |
3206 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
3207 | * since the caller handles this. | |
3208 | */ | |
3209 | goto end; | |
3210 | } | |
3211 | ||
9ce5646a MD |
3212 | health_code_update(); |
3213 | ||
331744e3 JD |
3214 | if (msg.cmd_type == LTTNG_ERR_UND) { |
3215 | /* No registry found */ | |
3216 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, | |
3217 | ret_code); | |
3218 | ret = 0; | |
3219 | goto end; | |
3220 | } else if (msg.cmd_type != LTTNG_CONSUMER_PUSH_METADATA) { | |
3221 | ERR("Unexpected cmd_type received %d", msg.cmd_type); | |
3222 | ret = -1; | |
3223 | goto end; | |
3224 | } | |
3225 | ||
3226 | len = msg.u.push_metadata.len; | |
3227 | key = msg.u.push_metadata.key; | |
3228 | offset = msg.u.push_metadata.target_offset; | |
93ec662e | 3229 | version = msg.u.push_metadata.version; |
331744e3 JD |
3230 | |
3231 | assert(key == channel->key); | |
3232 | if (len == 0) { | |
3233 | DBG("No new metadata to receive for key %" PRIu64, key); | |
3234 | } | |
3235 | ||
9ce5646a MD |
3236 | health_code_update(); |
3237 | ||
331744e3 JD |
3238 | /* Tell session daemon we are ready to receive the metadata. */ |
3239 | ret = consumer_send_status_msg(ctx->consumer_metadata_socket, | |
0c759fc9 | 3240 | LTTCOMM_CONSUMERD_SUCCESS); |
331744e3 JD |
3241 | if (ret < 0 || len == 0) { |
3242 | /* | |
3243 | * Somehow, the session daemon is not responding anymore or there is | |
3244 | * nothing to receive. | |
3245 | */ | |
3246 | goto end; | |
3247 | } | |
3248 | ||
9ce5646a MD |
3249 | health_code_update(); |
3250 | ||
1eb682be | 3251 | ret = lttng_ustconsumer_recv_metadata(ctx->consumer_metadata_socket, |
93ec662e | 3252 | key, offset, len, version, channel, timer, wait); |
1eb682be | 3253 | if (ret >= 0) { |
f2a444f1 DG |
3254 | /* |
3255 | * Only send the status msg if the sessiond is alive meaning a positive | |
3256 | * ret code. | |
3257 | */ | |
1eb682be | 3258 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, ret); |
f2a444f1 | 3259 | } |
331744e3 JD |
3260 | ret = 0; |
3261 | ||
3262 | end: | |
9ce5646a MD |
3263 | health_code_update(); |
3264 | ||
75d83e50 | 3265 | pthread_mutex_unlock(&ctx->metadata_socket_lock); |
331744e3 JD |
3266 | return ret; |
3267 | } | |
70190e1c DG |
3268 | |
3269 | /* | |
3270 | * Return the ustctl call for the get stream id. | |
3271 | */ | |
3272 | int lttng_ustconsumer_get_stream_id(struct lttng_consumer_stream *stream, | |
3273 | uint64_t *stream_id) | |
3274 | { | |
3275 | assert(stream); | |
3276 | assert(stream_id); | |
3277 | ||
3278 | return ustctl_get_stream_id(stream->ustream, stream_id); | |
3279 | } |