Commit | Line | Data |
---|---|---|
3bd1e081 | 1 | /* |
21cf9b6b | 2 | * Copyright (C) 2011 EfficiOS Inc. |
ab5be9fa MJ |
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 |
f02e1e8a | 11 | #include <lttng/ust-ctl.h> |
881fc67f | 12 | #include <lttng/ust-sigbus.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 | |
c9e313bc SM |
28 | #include <bin/lttng-consumerd/health-consumerd.hpp> |
29 | #include <common/common.hpp> | |
30 | #include <common/sessiond-comm/sessiond-comm.hpp> | |
31 | #include <common/relayd/relayd.hpp> | |
32 | #include <common/compat/fcntl.hpp> | |
33 | #include <common/compat/endian.hpp> | |
34 | #include <common/consumer/consumer-metadata-cache.hpp> | |
35 | #include <common/consumer/consumer-stream.hpp> | |
36 | #include <common/consumer/consumer-timer.hpp> | |
37 | #include <common/utils.hpp> | |
38 | #include <common/index/index.hpp> | |
39 | #include <common/consumer/consumer.hpp> | |
40 | #include <common/shm.hpp> | |
41 | #include <common/optional.hpp> | |
10a8a223 | 42 | |
c9e313bc | 43 | #include "ust-consumer.hpp" |
3bd1e081 | 44 | |
45863397 | 45 | #define INT_MAX_STR_LEN 12 /* includes \0 */ |
4628484a | 46 | |
fa29bfbf | 47 | extern struct lttng_consumer_global_data the_consumer_data; |
3bd1e081 | 48 | extern int consumer_poll_timeout; |
3bd1e081 | 49 | |
4bd69c5f | 50 | LTTNG_EXPORT DEFINE_LTTNG_UST_SIGBUS_STATE(); |
881fc67f | 51 | |
3bd1e081 | 52 | /* |
ffe60014 | 53 | * Add channel to internal consumer state. |
3bd1e081 | 54 | * |
ffe60014 | 55 | * Returns 0 on success or else a negative value. |
3bd1e081 | 56 | */ |
ffe60014 DG |
57 | static int add_channel(struct lttng_consumer_channel *channel, |
58 | struct lttng_consumer_local_data *ctx) | |
3bd1e081 MD |
59 | { |
60 | int ret = 0; | |
61 | ||
a0377dfe FD |
62 | LTTNG_ASSERT(channel); |
63 | LTTNG_ASSERT(ctx); | |
ffe60014 DG |
64 | |
65 | if (ctx->on_recv_channel != NULL) { | |
66 | ret = ctx->on_recv_channel(channel); | |
67 | if (ret == 0) { | |
d8ef542d | 68 | ret = consumer_add_channel(channel, ctx); |
ffe60014 DG |
69 | } else if (ret < 0) { |
70 | /* Most likely an ENOMEM. */ | |
71 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
72 | goto error; | |
73 | } | |
74 | } else { | |
d8ef542d | 75 | ret = consumer_add_channel(channel, ctx); |
3bd1e081 MD |
76 | } |
77 | ||
d88aee68 | 78 | DBG("UST consumer channel added (key: %" PRIu64 ")", channel->key); |
ffe60014 DG |
79 | |
80 | error: | |
3bd1e081 MD |
81 | return ret; |
82 | } | |
83 | ||
ffe60014 DG |
84 | /* |
85 | * Allocate and return a consumer stream object. If _alloc_ret is not NULL, the | |
86 | * error value if applicable is set in it else it is kept untouched. | |
3bd1e081 | 87 | * |
ffe60014 | 88 | * Return NULL on error else the newly allocated stream object. |
3bd1e081 | 89 | */ |
ffe60014 DG |
90 | static struct lttng_consumer_stream *allocate_stream(int cpu, int key, |
91 | struct lttng_consumer_channel *channel, | |
d2956687 | 92 | struct lttng_consumer_local_data *ctx, int *_alloc_ret) |
ffe60014 DG |
93 | { |
94 | int alloc_ret; | |
95 | struct lttng_consumer_stream *stream = NULL; | |
96 | ||
a0377dfe FD |
97 | LTTNG_ASSERT(channel); |
98 | LTTNG_ASSERT(ctx); | |
ffe60014 | 99 | |
6f9449c2 | 100 | stream = consumer_stream_create( |
49f45573 JG |
101 | channel, |
102 | channel->key, | |
ffe60014 | 103 | key, |
ffe60014 | 104 | channel->name, |
ffe60014 DG |
105 | channel->relayd_id, |
106 | channel->session_id, | |
d2956687 | 107 | channel->trace_chunk, |
ffe60014 DG |
108 | cpu, |
109 | &alloc_ret, | |
4891ece8 | 110 | channel->type, |
d2956687 | 111 | channel->monitor); |
ffe60014 DG |
112 | if (stream == NULL) { |
113 | switch (alloc_ret) { | |
114 | case -ENOENT: | |
115 | /* | |
116 | * We could not find the channel. Can happen if cpu hotplug | |
117 | * happens while tearing down. | |
118 | */ | |
119 | DBG3("Could not find channel"); | |
120 | break; | |
121 | case -ENOMEM: | |
122 | case -EINVAL: | |
123 | default: | |
124 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
125 | break; | |
126 | } | |
127 | goto error; | |
128 | } | |
129 | ||
d9a2e16e | 130 | consumer_stream_update_channel_attributes(stream, channel); |
ffe60014 DG |
131 | |
132 | error: | |
133 | if (_alloc_ret) { | |
134 | *_alloc_ret = alloc_ret; | |
135 | } | |
136 | return stream; | |
137 | } | |
138 | ||
139 | /* | |
140 | * Send the given stream pointer to the corresponding thread. | |
141 | * | |
142 | * Returns 0 on success else a negative value. | |
143 | */ | |
144 | static int send_stream_to_thread(struct lttng_consumer_stream *stream, | |
145 | struct lttng_consumer_local_data *ctx) | |
146 | { | |
dae10966 DG |
147 | int ret; |
148 | struct lttng_pipe *stream_pipe; | |
ffe60014 DG |
149 | |
150 | /* Get the right pipe where the stream will be sent. */ | |
151 | if (stream->metadata_flag) { | |
66d583dc | 152 | consumer_add_metadata_stream(stream); |
dae10966 | 153 | stream_pipe = ctx->consumer_metadata_pipe; |
ffe60014 | 154 | } else { |
66d583dc | 155 | consumer_add_data_stream(stream); |
dae10966 | 156 | stream_pipe = ctx->consumer_data_pipe; |
ffe60014 DG |
157 | } |
158 | ||
5ab66908 MD |
159 | /* |
160 | * From this point on, the stream's ownership has been moved away from | |
a8086cf4 JR |
161 | * the channel and it becomes globally visible. Hence, remove it from |
162 | * the local stream list to prevent the stream from being both local and | |
163 | * global. | |
5ab66908 MD |
164 | */ |
165 | stream->globally_visible = 1; | |
5c5e3d71 | 166 | cds_list_del_init(&stream->send_node); |
5ab66908 | 167 | |
dae10966 | 168 | ret = lttng_pipe_write(stream_pipe, &stream, sizeof(stream)); |
ffe60014 | 169 | if (ret < 0) { |
dae10966 DG |
170 | ERR("Consumer write %s stream to pipe %d", |
171 | stream->metadata_flag ? "metadata" : "data", | |
172 | lttng_pipe_get_writefd(stream_pipe)); | |
5ab66908 MD |
173 | if (stream->metadata_flag) { |
174 | consumer_del_stream_for_metadata(stream); | |
175 | } else { | |
176 | consumer_del_stream_for_data(stream); | |
177 | } | |
a8086cf4 | 178 | goto error; |
ffe60014 | 179 | } |
a8086cf4 | 180 | |
5ab66908 | 181 | error: |
ffe60014 DG |
182 | return ret; |
183 | } | |
184 | ||
4628484a MD |
185 | static |
186 | int get_stream_shm_path(char *stream_shm_path, const char *shm_path, int cpu) | |
187 | { | |
45863397 | 188 | char cpu_nr[INT_MAX_STR_LEN]; /* int max len */ |
4628484a MD |
189 | int ret; |
190 | ||
191 | strncpy(stream_shm_path, shm_path, PATH_MAX); | |
192 | stream_shm_path[PATH_MAX - 1] = '\0'; | |
45863397 | 193 | ret = snprintf(cpu_nr, INT_MAX_STR_LEN, "%i", cpu); |
67f8cb8d MD |
194 | if (ret < 0) { |
195 | PERROR("snprintf"); | |
4628484a MD |
196 | goto end; |
197 | } | |
198 | strncat(stream_shm_path, cpu_nr, | |
199 | PATH_MAX - strlen(stream_shm_path) - 1); | |
200 | ret = 0; | |
201 | end: | |
202 | return ret; | |
203 | } | |
204 | ||
d88aee68 DG |
205 | /* |
206 | * Create streams for the given channel using liblttng-ust-ctl. | |
d2956687 | 207 | * The channel lock must be acquired by the caller. |
d88aee68 DG |
208 | * |
209 | * Return 0 on success else a negative value. | |
210 | */ | |
ffe60014 | 211 | static int create_ust_streams(struct lttng_consumer_channel *channel, |
d2956687 | 212 | struct lttng_consumer_local_data *ctx) |
ffe60014 DG |
213 | { |
214 | int ret, cpu = 0; | |
b623cb6a | 215 | struct lttng_ust_ctl_consumer_stream *ustream; |
ffe60014 | 216 | struct lttng_consumer_stream *stream; |
d2956687 | 217 | pthread_mutex_t *current_stream_lock = NULL; |
ffe60014 | 218 | |
a0377dfe FD |
219 | LTTNG_ASSERT(channel); |
220 | LTTNG_ASSERT(ctx); | |
ffe60014 DG |
221 | |
222 | /* | |
223 | * While a stream is available from ustctl. When NULL is returned, we've | |
224 | * reached the end of the possible stream for the channel. | |
225 | */ | |
b623cb6a | 226 | while ((ustream = lttng_ust_ctl_create_stream(channel->uchan, cpu))) { |
ffe60014 | 227 | int wait_fd; |
04ef1097 | 228 | int ust_metadata_pipe[2]; |
ffe60014 | 229 | |
9ce5646a MD |
230 | health_code_update(); |
231 | ||
04ef1097 MD |
232 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && channel->monitor) { |
233 | ret = utils_create_pipe_cloexec_nonblock(ust_metadata_pipe); | |
234 | if (ret < 0) { | |
235 | ERR("Create ust metadata poll pipe"); | |
236 | goto error; | |
237 | } | |
238 | wait_fd = ust_metadata_pipe[0]; | |
239 | } else { | |
b623cb6a | 240 | wait_fd = lttng_ust_ctl_stream_get_wait_fd(ustream); |
04ef1097 | 241 | } |
ffe60014 DG |
242 | |
243 | /* Allocate consumer stream object. */ | |
d2956687 | 244 | stream = allocate_stream(cpu, wait_fd, channel, ctx, &ret); |
ffe60014 DG |
245 | if (!stream) { |
246 | goto error_alloc; | |
247 | } | |
248 | stream->ustream = ustream; | |
249 | /* | |
250 | * Store it so we can save multiple function calls afterwards since | |
251 | * this value is used heavily in the stream threads. This is UST | |
252 | * specific so this is why it's done after allocation. | |
253 | */ | |
254 | stream->wait_fd = wait_fd; | |
255 | ||
b31398bb DG |
256 | /* |
257 | * Increment channel refcount since the channel reference has now been | |
258 | * assigned in the allocation process above. | |
259 | */ | |
10a50311 JD |
260 | if (stream->chan->monitor) { |
261 | uatomic_inc(&stream->chan->refcount); | |
262 | } | |
b31398bb | 263 | |
d2956687 JG |
264 | pthread_mutex_lock(&stream->lock); |
265 | current_stream_lock = &stream->lock; | |
ffe60014 DG |
266 | /* |
267 | * Order is important this is why a list is used. On error, the caller | |
268 | * should clean this list. | |
269 | */ | |
270 | cds_list_add_tail(&stream->send_node, &channel->streams.head); | |
271 | ||
b623cb6a | 272 | ret = lttng_ust_ctl_get_max_subbuf_size(stream->ustream, |
ffe60014 DG |
273 | &stream->max_sb_size); |
274 | if (ret < 0) { | |
b623cb6a | 275 | ERR("lttng_ust_ctl_get_max_subbuf_size failed for stream %s", |
ffe60014 DG |
276 | stream->name); |
277 | goto error; | |
278 | } | |
279 | ||
280 | /* Do actions once stream has been received. */ | |
281 | if (ctx->on_recv_stream) { | |
282 | ret = ctx->on_recv_stream(stream); | |
283 | if (ret < 0) { | |
284 | goto error; | |
285 | } | |
286 | } | |
287 | ||
d88aee68 | 288 | DBG("UST consumer add stream %s (key: %" PRIu64 ") with relayd id %" PRIu64, |
ffe60014 DG |
289 | stream->name, stream->key, stream->relayd_stream_id); |
290 | ||
291 | /* Set next CPU stream. */ | |
292 | channel->streams.count = ++cpu; | |
d88aee68 DG |
293 | |
294 | /* Keep stream reference when creating metadata. */ | |
295 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) { | |
296 | channel->metadata_stream = stream; | |
8de4f941 JG |
297 | if (channel->monitor) { |
298 | /* Set metadata poll pipe if we created one */ | |
299 | memcpy(stream->ust_metadata_poll_pipe, | |
300 | ust_metadata_pipe, | |
301 | sizeof(ust_metadata_pipe)); | |
302 | } | |
d88aee68 | 303 | } |
d2956687 JG |
304 | pthread_mutex_unlock(&stream->lock); |
305 | current_stream_lock = NULL; | |
ffe60014 DG |
306 | } |
307 | ||
308 | return 0; | |
309 | ||
310 | error: | |
311 | error_alloc: | |
d2956687 JG |
312 | if (current_stream_lock) { |
313 | pthread_mutex_unlock(current_stream_lock); | |
314 | } | |
ffe60014 DG |
315 | return ret; |
316 | } | |
317 | ||
d2956687 JG |
318 | static int open_ust_stream_fd(struct lttng_consumer_channel *channel, int cpu, |
319 | const struct lttng_credentials *session_credentials) | |
4628484a MD |
320 | { |
321 | char shm_path[PATH_MAX]; | |
322 | int ret; | |
323 | ||
324 | if (!channel->shm_path[0]) { | |
b7fc068d | 325 | return shm_create_anonymous("ust-consumer"); |
4628484a MD |
326 | } |
327 | ret = get_stream_shm_path(shm_path, channel->shm_path, cpu); | |
328 | if (ret) { | |
329 | goto error_shm_path; | |
330 | } | |
331 | return run_as_open(shm_path, | |
332 | O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR, | |
ff588497 JR |
333 | lttng_credentials_get_uid(session_credentials), |
334 | lttng_credentials_get_gid(session_credentials)); | |
4628484a MD |
335 | |
336 | error_shm_path: | |
337 | return -1; | |
338 | } | |
339 | ||
ffe60014 DG |
340 | /* |
341 | * Create an UST channel with the given attributes and send it to the session | |
342 | * daemon using the ust ctl API. | |
343 | * | |
344 | * Return 0 on success or else a negative value. | |
345 | */ | |
4628484a | 346 | static int create_ust_channel(struct lttng_consumer_channel *channel, |
b623cb6a MJ |
347 | struct lttng_ust_ctl_consumer_channel_attr *attr, |
348 | struct lttng_ust_ctl_consumer_channel **ust_chanp) | |
ffe60014 | 349 | { |
4628484a MD |
350 | int ret, nr_stream_fds, i, j; |
351 | int *stream_fds; | |
b623cb6a | 352 | struct lttng_ust_ctl_consumer_channel *ust_channel; |
ffe60014 | 353 | |
a0377dfe FD |
354 | LTTNG_ASSERT(channel); |
355 | LTTNG_ASSERT(attr); | |
356 | LTTNG_ASSERT(ust_chanp); | |
357 | LTTNG_ASSERT(channel->buffer_credentials.is_set); | |
ffe60014 DG |
358 | |
359 | DBG3("Creating channel to ustctl with attr: [overwrite: %d, " | |
360 | "subbuf_size: %" PRIu64 ", num_subbuf: %" PRIu64 ", " | |
361 | "switch_timer_interval: %u, read_timer_interval: %u, " | |
362 | "output: %d, type: %d", attr->overwrite, attr->subbuf_size, | |
363 | attr->num_subbuf, attr->switch_timer_interval, | |
364 | attr->read_timer_interval, attr->output, attr->type); | |
365 | ||
4628484a MD |
366 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) |
367 | nr_stream_fds = 1; | |
368 | else | |
b623cb6a | 369 | nr_stream_fds = lttng_ust_ctl_get_nr_stream_per_channel(); |
64803277 | 370 | stream_fds = calloc<int>(nr_stream_fds); |
4628484a MD |
371 | if (!stream_fds) { |
372 | ret = -1; | |
373 | goto error_alloc; | |
374 | } | |
375 | for (i = 0; i < nr_stream_fds; i++) { | |
d2956687 JG |
376 | stream_fds[i] = open_ust_stream_fd(channel, i, |
377 | &channel->buffer_credentials.value); | |
4628484a MD |
378 | if (stream_fds[i] < 0) { |
379 | ret = -1; | |
380 | goto error_open; | |
381 | } | |
382 | } | |
b623cb6a | 383 | ust_channel = lttng_ust_ctl_create_channel(attr, stream_fds, nr_stream_fds); |
4628484a | 384 | if (!ust_channel) { |
ffe60014 DG |
385 | ret = -1; |
386 | goto error_create; | |
387 | } | |
4628484a MD |
388 | channel->nr_stream_fds = nr_stream_fds; |
389 | channel->stream_fds = stream_fds; | |
390 | *ust_chanp = ust_channel; | |
ffe60014 DG |
391 | |
392 | return 0; | |
393 | ||
394 | error_create: | |
4628484a MD |
395 | error_open: |
396 | for (j = i - 1; j >= 0; j--) { | |
397 | int closeret; | |
398 | ||
399 | closeret = close(stream_fds[j]); | |
400 | if (closeret) { | |
401 | PERROR("close"); | |
402 | } | |
403 | if (channel->shm_path[0]) { | |
404 | char shm_path[PATH_MAX]; | |
405 | ||
406 | closeret = get_stream_shm_path(shm_path, | |
407 | channel->shm_path, j); | |
408 | if (closeret) { | |
409 | ERR("Cannot get stream shm path"); | |
410 | } | |
411 | closeret = run_as_unlink(shm_path, | |
ff588497 JR |
412 | lttng_credentials_get_uid(LTTNG_OPTIONAL_GET_PTR( |
413 | channel->buffer_credentials)), | |
414 | lttng_credentials_get_gid(LTTNG_OPTIONAL_GET_PTR( | |
415 | channel->buffer_credentials))); | |
4628484a | 416 | if (closeret) { |
4628484a MD |
417 | PERROR("unlink %s", shm_path); |
418 | } | |
419 | } | |
420 | } | |
421 | /* Try to rmdir all directories under shm_path root. */ | |
422 | if (channel->root_shm_path[0]) { | |
602766ec | 423 | (void) run_as_rmdir_recursive(channel->root_shm_path, |
ff588497 JR |
424 | lttng_credentials_get_uid(LTTNG_OPTIONAL_GET_PTR( |
425 | channel->buffer_credentials)), | |
426 | lttng_credentials_get_gid(LTTNG_OPTIONAL_GET_PTR( | |
427 | channel->buffer_credentials)), | |
f75c5439 | 428 | LTTNG_DIRECTORY_HANDLE_SKIP_NON_EMPTY_FLAG); |
4628484a MD |
429 | } |
430 | free(stream_fds); | |
431 | error_alloc: | |
ffe60014 DG |
432 | return ret; |
433 | } | |
434 | ||
d88aee68 DG |
435 | /* |
436 | * Send a single given stream to the session daemon using the sock. | |
437 | * | |
438 | * Return 0 on success else a negative value. | |
439 | */ | |
ffe60014 DG |
440 | static int send_sessiond_stream(int sock, struct lttng_consumer_stream *stream) |
441 | { | |
442 | int ret; | |
443 | ||
a0377dfe FD |
444 | LTTNG_ASSERT(stream); |
445 | LTTNG_ASSERT(sock >= 0); | |
ffe60014 | 446 | |
3eb914c0 | 447 | DBG("UST consumer sending stream %" PRIu64 " to sessiond", stream->key); |
ffe60014 DG |
448 | |
449 | /* Send stream to session daemon. */ | |
b623cb6a | 450 | ret = lttng_ust_ctl_send_stream_to_sessiond(sock, stream->ustream); |
ffe60014 DG |
451 | if (ret < 0) { |
452 | goto error; | |
453 | } | |
454 | ||
ffe60014 DG |
455 | error: |
456 | return ret; | |
457 | } | |
458 | ||
459 | /* | |
a3a86f35 | 460 | * Send channel to sessiond and relayd if applicable. |
ffe60014 | 461 | * |
d88aee68 | 462 | * Return 0 on success or else a negative value. |
ffe60014 | 463 | */ |
a3a86f35 | 464 | static int send_channel_to_sessiond_and_relayd(int sock, |
ffe60014 DG |
465 | struct lttng_consumer_channel *channel, |
466 | struct lttng_consumer_local_data *ctx, int *relayd_error) | |
467 | { | |
0c759fc9 | 468 | int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
ffe60014 | 469 | struct lttng_consumer_stream *stream; |
a4baae1b | 470 | uint64_t net_seq_idx = -1ULL; |
ffe60014 | 471 | |
a0377dfe FD |
472 | LTTNG_ASSERT(channel); |
473 | LTTNG_ASSERT(ctx); | |
474 | LTTNG_ASSERT(sock >= 0); | |
ffe60014 DG |
475 | |
476 | DBG("UST consumer sending channel %s to sessiond", channel->name); | |
477 | ||
62285ea4 DG |
478 | if (channel->relayd_id != (uint64_t) -1ULL) { |
479 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
480 | |
481 | health_code_update(); | |
482 | ||
62285ea4 | 483 | /* Try to send the stream to the relayd if one is available. */ |
a3a86f35 JG |
484 | DBG("Sending stream %" PRIu64 " of channel \"%s\" to relayd", |
485 | stream->key, channel->name); | |
62285ea4 DG |
486 | ret = consumer_send_relayd_stream(stream, stream->chan->pathname); |
487 | if (ret < 0) { | |
488 | /* | |
489 | * Flag that the relayd was the problem here probably due to a | |
490 | * communicaton error on the socket. | |
491 | */ | |
492 | if (relayd_error) { | |
493 | *relayd_error = 1; | |
494 | } | |
725d28b2 | 495 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
ffe60014 | 496 | } |
a4baae1b JD |
497 | if (net_seq_idx == -1ULL) { |
498 | net_seq_idx = stream->net_seq_idx; | |
499 | } | |
500 | } | |
f2a444f1 | 501 | } |
ffe60014 | 502 | |
f2a444f1 DG |
503 | /* Inform sessiond that we are about to send channel and streams. */ |
504 | ret = consumer_send_status_msg(sock, ret_code); | |
0c759fc9 | 505 | if (ret < 0 || ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
f2a444f1 DG |
506 | /* |
507 | * Either the session daemon is not responding or the relayd died so we | |
508 | * stop now. | |
509 | */ | |
510 | goto error; | |
511 | } | |
512 | ||
513 | /* Send channel to sessiond. */ | |
b623cb6a | 514 | ret = lttng_ust_ctl_send_channel_to_sessiond(sock, channel->uchan); |
f2a444f1 DG |
515 | if (ret < 0) { |
516 | goto error; | |
517 | } | |
518 | ||
b623cb6a | 519 | ret = lttng_ust_ctl_channel_close_wakeup_fd(channel->uchan); |
f2a444f1 DG |
520 | if (ret < 0) { |
521 | goto error; | |
522 | } | |
523 | ||
524 | /* The channel was sent successfully to the sessiond at this point. */ | |
525 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
526 | |
527 | health_code_update(); | |
528 | ||
ffe60014 DG |
529 | /* Send stream to session daemon. */ |
530 | ret = send_sessiond_stream(sock, stream); | |
531 | if (ret < 0) { | |
532 | goto error; | |
533 | } | |
534 | } | |
535 | ||
536 | /* Tell sessiond there is no more stream. */ | |
b623cb6a | 537 | ret = lttng_ust_ctl_send_stream_to_sessiond(sock, NULL); |
ffe60014 DG |
538 | if (ret < 0) { |
539 | goto error; | |
540 | } | |
541 | ||
542 | DBG("UST consumer NULL stream sent to sessiond"); | |
543 | ||
544 | return 0; | |
545 | ||
546 | error: | |
0c759fc9 | 547 | if (ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
f2a444f1 DG |
548 | ret = -1; |
549 | } | |
ffe60014 DG |
550 | return ret; |
551 | } | |
552 | ||
553 | /* | |
554 | * Creates a channel and streams and add the channel it to the channel internal | |
555 | * state. The created stream must ONLY be sent once the GET_CHANNEL command is | |
556 | * received. | |
557 | * | |
558 | * Return 0 on success or else, a negative value is returned and the channel | |
559 | * MUST be destroyed by consumer_del_channel(). | |
560 | */ | |
75cfe9e6 | 561 | static int ask_channel(struct lttng_consumer_local_data *ctx, |
ffe60014 | 562 | struct lttng_consumer_channel *channel, |
b623cb6a | 563 | struct lttng_ust_ctl_consumer_channel_attr *attr) |
3bd1e081 MD |
564 | { |
565 | int ret; | |
566 | ||
a0377dfe FD |
567 | LTTNG_ASSERT(ctx); |
568 | LTTNG_ASSERT(channel); | |
569 | LTTNG_ASSERT(attr); | |
ffe60014 DG |
570 | |
571 | /* | |
572 | * This value is still used by the kernel consumer since for the kernel, | |
573 | * the stream ownership is not IN the consumer so we need to have the | |
574 | * number of left stream that needs to be initialized so we can know when | |
575 | * to delete the channel (see consumer.c). | |
576 | * | |
577 | * As for the user space tracer now, the consumer creates and sends the | |
578 | * stream to the session daemon which only sends them to the application | |
579 | * once every stream of a channel is received making this value useless | |
580 | * because we they will be added to the poll thread before the application | |
581 | * receives them. This ensures that a stream can not hang up during | |
582 | * initilization of a channel. | |
583 | */ | |
584 | channel->nb_init_stream_left = 0; | |
585 | ||
586 | /* The reply msg status is handled in the following call. */ | |
4628484a | 587 | ret = create_ust_channel(channel, attr, &channel->uchan); |
ffe60014 | 588 | if (ret < 0) { |
10a50311 | 589 | goto end; |
3bd1e081 MD |
590 | } |
591 | ||
b623cb6a | 592 | channel->wait_fd = lttng_ust_ctl_channel_get_wait_fd(channel->uchan); |
d8ef542d | 593 | |
10a50311 JD |
594 | /* |
595 | * For the snapshots (no monitor), we create the metadata streams | |
596 | * on demand, not during the channel creation. | |
597 | */ | |
598 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && !channel->monitor) { | |
599 | ret = 0; | |
600 | goto end; | |
601 | } | |
602 | ||
ffe60014 | 603 | /* Open all streams for this channel. */ |
d2956687 JG |
604 | pthread_mutex_lock(&channel->lock); |
605 | ret = create_ust_streams(channel, ctx); | |
606 | pthread_mutex_unlock(&channel->lock); | |
ffe60014 | 607 | if (ret < 0) { |
10a50311 | 608 | goto end; |
ffe60014 DG |
609 | } |
610 | ||
10a50311 | 611 | end: |
3bd1e081 MD |
612 | return ret; |
613 | } | |
614 | ||
d88aee68 DG |
615 | /* |
616 | * Send all stream of a channel to the right thread handling it. | |
617 | * | |
618 | * On error, return a negative value else 0 on success. | |
619 | */ | |
620 | static int send_streams_to_thread(struct lttng_consumer_channel *channel, | |
621 | struct lttng_consumer_local_data *ctx) | |
622 | { | |
623 | int ret = 0; | |
624 | struct lttng_consumer_stream *stream, *stmp; | |
625 | ||
a0377dfe FD |
626 | LTTNG_ASSERT(channel); |
627 | LTTNG_ASSERT(ctx); | |
d88aee68 DG |
628 | |
629 | /* Send streams to the corresponding thread. */ | |
630 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
631 | send_node) { | |
9ce5646a MD |
632 | |
633 | health_code_update(); | |
634 | ||
d88aee68 DG |
635 | /* Sending the stream to the thread. */ |
636 | ret = send_stream_to_thread(stream, ctx); | |
637 | if (ret < 0) { | |
638 | /* | |
639 | * If we are unable to send the stream to the thread, there is | |
640 | * a big problem so just stop everything. | |
641 | */ | |
642 | goto error; | |
643 | } | |
d88aee68 DG |
644 | } |
645 | ||
646 | error: | |
647 | return ret; | |
648 | } | |
649 | ||
7972aab2 DG |
650 | /* |
651 | * Flush channel's streams using the given key to retrieve the channel. | |
652 | * | |
653 | * Return 0 on success else an LTTng error code. | |
654 | */ | |
655 | static int flush_channel(uint64_t chan_key) | |
656 | { | |
657 | int ret = 0; | |
658 | struct lttng_consumer_channel *channel; | |
659 | struct lttng_consumer_stream *stream; | |
660 | struct lttng_ht *ht; | |
661 | struct lttng_ht_iter iter; | |
662 | ||
8fd623e0 | 663 | DBG("UST consumer flush channel key %" PRIu64, chan_key); |
7972aab2 | 664 | |
a500c257 | 665 | rcu_read_lock(); |
7972aab2 DG |
666 | channel = consumer_find_channel(chan_key); |
667 | if (!channel) { | |
8fd623e0 | 668 | ERR("UST consumer flush channel %" PRIu64 " not found", chan_key); |
7972aab2 DG |
669 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
670 | goto error; | |
671 | } | |
672 | ||
fa29bfbf | 673 | ht = the_consumer_data.stream_per_chan_id_ht; |
7972aab2 DG |
674 | |
675 | /* For each stream of the channel id, flush it. */ | |
7972aab2 DG |
676 | cds_lfht_for_each_entry_duplicate(ht->ht, |
677 | ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct, | |
678 | &channel->key, &iter.iter, stream, node_channel_id.node) { | |
9ce5646a MD |
679 | |
680 | health_code_update(); | |
681 | ||
0dd01979 | 682 | pthread_mutex_lock(&stream->lock); |
5cfcab67 JR |
683 | |
684 | /* | |
685 | * Protect against concurrent teardown of a stream. | |
686 | */ | |
687 | if (cds_lfht_is_node_deleted(&stream->node.node)) { | |
688 | goto next; | |
689 | } | |
690 | ||
0dd01979 | 691 | if (!stream->quiescent) { |
881fc67f MD |
692 | ret = lttng_ust_ctl_flush_buffer(stream->ustream, 0); |
693 | if (ret) { | |
694 | ERR("Failed to flush buffer while flushing channel: channel key = %" PRIu64 ", channel name = '%s'", | |
695 | chan_key, channel->name); | |
696 | ret = LTTNG_ERR_BUFFER_FLUSH_FAILED; | |
697 | pthread_mutex_unlock(&stream->lock); | |
698 | goto error; | |
699 | } | |
0dd01979 MD |
700 | stream->quiescent = true; |
701 | } | |
5cfcab67 | 702 | next: |
0dd01979 MD |
703 | pthread_mutex_unlock(&stream->lock); |
704 | } | |
9cc4ae91 JG |
705 | |
706 | /* | |
707 | * Send one last buffer statistics update to the session daemon. This | |
708 | * ensures that the session daemon gets at least one statistics update | |
709 | * per channel even in the case of short-lived channels, such as when a | |
710 | * short-lived app is traced in per-pid mode. | |
711 | */ | |
712 | sample_and_send_channel_buffer_stats(channel); | |
0dd01979 MD |
713 | error: |
714 | rcu_read_unlock(); | |
715 | return ret; | |
716 | } | |
717 | ||
718 | /* | |
719 | * Clear quiescent state from channel's streams using the given key to | |
720 | * retrieve the channel. | |
721 | * | |
722 | * Return 0 on success else an LTTng error code. | |
723 | */ | |
724 | static int clear_quiescent_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 | ||
732 | DBG("UST consumer clear quiescent channel key %" PRIu64, chan_key); | |
733 | ||
734 | rcu_read_lock(); | |
735 | channel = consumer_find_channel(chan_key); | |
736 | if (!channel) { | |
737 | ERR("UST consumer clear quiescent channel %" PRIu64 " not found", chan_key); | |
738 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
739 | goto error; | |
740 | } | |
741 | ||
fa29bfbf | 742 | ht = the_consumer_data.stream_per_chan_id_ht; |
0dd01979 MD |
743 | |
744 | /* For each stream of the channel id, clear quiescent state. */ | |
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) { | |
748 | ||
749 | health_code_update(); | |
750 | ||
751 | pthread_mutex_lock(&stream->lock); | |
752 | stream->quiescent = false; | |
753 | pthread_mutex_unlock(&stream->lock); | |
7972aab2 | 754 | } |
7972aab2 | 755 | error: |
a500c257 | 756 | rcu_read_unlock(); |
7972aab2 DG |
757 | return ret; |
758 | } | |
759 | ||
d88aee68 DG |
760 | /* |
761 | * Close metadata stream wakeup_fd using the given key to retrieve the channel. | |
762 | * | |
763 | * Return 0 on success else an LTTng error code. | |
764 | */ | |
765 | static int close_metadata(uint64_t chan_key) | |
766 | { | |
ea88ca2a | 767 | int ret = 0; |
d88aee68 | 768 | struct lttng_consumer_channel *channel; |
f65a74be | 769 | unsigned int channel_monitor; |
d88aee68 | 770 | |
8fd623e0 | 771 | DBG("UST consumer close metadata key %" PRIu64, chan_key); |
d88aee68 DG |
772 | |
773 | channel = consumer_find_channel(chan_key); | |
774 | if (!channel) { | |
84cc9aa0 DG |
775 | /* |
776 | * This is possible if the metadata thread has issue a delete because | |
777 | * the endpoint point of the stream hung up. There is no way the | |
778 | * session daemon can know about it thus use a DBG instead of an actual | |
779 | * error. | |
780 | */ | |
781 | DBG("UST consumer close metadata %" PRIu64 " not found", chan_key); | |
d88aee68 DG |
782 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
783 | goto error; | |
784 | } | |
785 | ||
fa29bfbf | 786 | pthread_mutex_lock(&the_consumer_data.lock); |
a9838785 | 787 | pthread_mutex_lock(&channel->lock); |
f65a74be | 788 | channel_monitor = channel->monitor; |
73811ecc DG |
789 | if (cds_lfht_is_node_deleted(&channel->node.node)) { |
790 | goto error_unlock; | |
791 | } | |
792 | ||
6d574024 | 793 | lttng_ustconsumer_close_metadata(channel); |
f65a74be | 794 | pthread_mutex_unlock(&channel->lock); |
fa29bfbf | 795 | pthread_mutex_unlock(&the_consumer_data.lock); |
d88aee68 | 796 | |
f65a74be JG |
797 | /* |
798 | * The ownership of a metadata channel depends on the type of | |
799 | * session to which it belongs. In effect, the monitor flag is checked | |
800 | * to determine if this metadata channel is in "snapshot" mode or not. | |
801 | * | |
802 | * In the non-snapshot case, the metadata channel is created along with | |
803 | * a single stream which will remain present until the metadata channel | |
804 | * is destroyed (on the destruction of its session). In this case, the | |
805 | * metadata stream in "monitored" by the metadata poll thread and holds | |
806 | * the ownership of its channel. | |
807 | * | |
808 | * Closing the metadata will cause the metadata stream's "metadata poll | |
809 | * pipe" to be closed. Closing this pipe will wake-up the metadata poll | |
810 | * thread which will teardown the metadata stream which, in return, | |
811 | * deletes the metadata channel. | |
812 | * | |
813 | * In the snapshot case, the metadata stream is created and destroyed | |
814 | * on every snapshot record. Since the channel doesn't have an owner | |
815 | * other than the session daemon, it is safe to destroy it immediately | |
816 | * on reception of the CLOSE_METADATA command. | |
817 | */ | |
818 | if (!channel_monitor) { | |
819 | /* | |
820 | * The channel and consumer_data locks must be | |
821 | * released before this call since consumer_del_channel | |
822 | * re-acquires the channel and consumer_data locks to teardown | |
823 | * the channel and queue its reclamation by the "call_rcu" | |
824 | * worker thread. | |
825 | */ | |
826 | consumer_del_channel(channel); | |
827 | } | |
828 | ||
829 | return ret; | |
ea88ca2a | 830 | error_unlock: |
a9838785 | 831 | pthread_mutex_unlock(&channel->lock); |
fa29bfbf | 832 | pthread_mutex_unlock(&the_consumer_data.lock); |
d88aee68 DG |
833 | error: |
834 | return ret; | |
835 | } | |
836 | ||
837 | /* | |
838 | * RCU read side lock MUST be acquired before calling this function. | |
839 | * | |
840 | * Return 0 on success else an LTTng error code. | |
841 | */ | |
842 | static int setup_metadata(struct lttng_consumer_local_data *ctx, uint64_t key) | |
843 | { | |
844 | int ret; | |
845 | struct lttng_consumer_channel *metadata; | |
846 | ||
48b7cdc2 FD |
847 | ASSERT_RCU_READ_LOCKED(); |
848 | ||
8fd623e0 | 849 | DBG("UST consumer setup metadata key %" PRIu64, key); |
d88aee68 DG |
850 | |
851 | metadata = consumer_find_channel(key); | |
852 | if (!metadata) { | |
853 | ERR("UST consumer push metadata %" PRIu64 " not found", key); | |
854 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
10a50311 JD |
855 | goto end; |
856 | } | |
857 | ||
858 | /* | |
859 | * In no monitor mode, the metadata channel has no stream(s) so skip the | |
860 | * ownership transfer to the metadata thread. | |
861 | */ | |
862 | if (!metadata->monitor) { | |
863 | DBG("Metadata channel in no monitor"); | |
864 | ret = 0; | |
865 | goto end; | |
d88aee68 DG |
866 | } |
867 | ||
868 | /* | |
869 | * Send metadata stream to relayd if one available. Availability is | |
870 | * known if the stream is still in the list of the channel. | |
871 | */ | |
872 | if (cds_list_empty(&metadata->streams.head)) { | |
873 | ERR("Metadata channel key %" PRIu64 ", no stream available.", key); | |
874 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
f5a0c9cf | 875 | goto error_no_stream; |
d88aee68 DG |
876 | } |
877 | ||
878 | /* Send metadata stream to relayd if needed. */ | |
62285ea4 DG |
879 | if (metadata->metadata_stream->net_seq_idx != (uint64_t) -1ULL) { |
880 | ret = consumer_send_relayd_stream(metadata->metadata_stream, | |
881 | metadata->pathname); | |
882 | if (ret < 0) { | |
883 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
884 | goto error; | |
885 | } | |
601262d6 JD |
886 | ret = consumer_send_relayd_streams_sent( |
887 | metadata->metadata_stream->net_seq_idx); | |
888 | if (ret < 0) { | |
889 | ret = LTTCOMM_CONSUMERD_RELAYD_FAIL; | |
890 | goto error; | |
891 | } | |
d88aee68 DG |
892 | } |
893 | ||
a8086cf4 JR |
894 | /* |
895 | * Ownership of metadata stream is passed along. Freeing is handled by | |
896 | * the callee. | |
897 | */ | |
d88aee68 DG |
898 | ret = send_streams_to_thread(metadata, ctx); |
899 | if (ret < 0) { | |
900 | /* | |
901 | * If we are unable to send the stream to the thread, there is | |
902 | * a big problem so just stop everything. | |
903 | */ | |
904 | ret = LTTCOMM_CONSUMERD_FATAL; | |
a8086cf4 | 905 | goto send_streams_error; |
d88aee68 DG |
906 | } |
907 | /* List MUST be empty after or else it could be reused. */ | |
a0377dfe | 908 | LTTNG_ASSERT(cds_list_empty(&metadata->streams.head)); |
d88aee68 | 909 | |
10a50311 JD |
910 | ret = 0; |
911 | goto end; | |
d88aee68 DG |
912 | |
913 | error: | |
f2a444f1 DG |
914 | /* |
915 | * Delete metadata channel on error. At this point, the metadata stream can | |
916 | * NOT be monitored by the metadata thread thus having the guarantee that | |
917 | * the stream is still in the local stream list of the channel. This call | |
918 | * will make sure to clean that list. | |
919 | */ | |
f5a0c9cf | 920 | consumer_stream_destroy(metadata->metadata_stream, NULL); |
212d67a2 | 921 | metadata->metadata_stream = NULL; |
a8086cf4 | 922 | send_streams_error: |
f5a0c9cf | 923 | error_no_stream: |
10a50311 JD |
924 | end: |
925 | return ret; | |
926 | } | |
927 | ||
928 | /* | |
929 | * Snapshot the whole metadata. | |
d2956687 | 930 | * RCU read-side lock must be held by the caller. |
10a50311 JD |
931 | * |
932 | * Returns 0 on success, < 0 on error | |
933 | */ | |
3eb928aa MD |
934 | static int snapshot_metadata(struct lttng_consumer_channel *metadata_channel, |
935 | uint64_t key, char *path, uint64_t relayd_id, | |
d2956687 | 936 | struct lttng_consumer_local_data *ctx) |
10a50311 JD |
937 | { |
938 | int ret = 0; | |
10a50311 JD |
939 | struct lttng_consumer_stream *metadata_stream; |
940 | ||
a0377dfe FD |
941 | LTTNG_ASSERT(path); |
942 | LTTNG_ASSERT(ctx); | |
48b7cdc2 | 943 | ASSERT_RCU_READ_LOCKED(); |
10a50311 JD |
944 | |
945 | DBG("UST consumer snapshot metadata with key %" PRIu64 " at path %s", | |
946 | key, path); | |
947 | ||
948 | rcu_read_lock(); | |
949 | ||
a0377dfe | 950 | LTTNG_ASSERT(!metadata_channel->monitor); |
10a50311 | 951 | |
9ce5646a MD |
952 | health_code_update(); |
953 | ||
10a50311 JD |
954 | /* |
955 | * Ask the sessiond if we have new metadata waiting and update the | |
956 | * consumer metadata cache. | |
957 | */ | |
94d49140 | 958 | ret = lttng_ustconsumer_request_metadata(ctx, metadata_channel, 0, 1); |
10a50311 JD |
959 | if (ret < 0) { |
960 | goto error; | |
961 | } | |
962 | ||
9ce5646a MD |
963 | health_code_update(); |
964 | ||
10a50311 JD |
965 | /* |
966 | * The metadata stream is NOT created in no monitor mode when the channel | |
967 | * is created on a sessiond ask channel command. | |
968 | */ | |
d2956687 | 969 | ret = create_ust_streams(metadata_channel, ctx); |
10a50311 JD |
970 | if (ret < 0) { |
971 | goto error; | |
972 | } | |
973 | ||
974 | metadata_stream = metadata_channel->metadata_stream; | |
a0377dfe | 975 | LTTNG_ASSERT(metadata_stream); |
10a50311 | 976 | |
947bd097 | 977 | metadata_stream->read_subbuffer_ops.lock(metadata_stream); |
10a50311 JD |
978 | if (relayd_id != (uint64_t) -1ULL) { |
979 | metadata_stream->net_seq_idx = relayd_id; | |
980 | ret = consumer_send_relayd_stream(metadata_stream, path); | |
10a50311 | 981 | } else { |
d2956687 JG |
982 | ret = consumer_stream_create_output_files(metadata_stream, |
983 | false); | |
984 | } | |
d2956687 JG |
985 | if (ret < 0) { |
986 | goto error_stream; | |
10a50311 JD |
987 | } |
988 | ||
04ef1097 | 989 | do { |
9ce5646a | 990 | health_code_update(); |
6f9449c2 | 991 | ret = lttng_consumer_read_subbuffer(metadata_stream, ctx, true); |
10a50311 | 992 | if (ret < 0) { |
94d49140 | 993 | goto error_stream; |
10a50311 | 994 | } |
04ef1097 | 995 | } while (ret > 0); |
10a50311 | 996 | |
10a50311 | 997 | error_stream: |
947bd097 | 998 | metadata_stream->read_subbuffer_ops.unlock(metadata_stream); |
10a50311 | 999 | /* |
947bd097 JR |
1000 | * Clean up the stream completely because the next snapshot will use a |
1001 | * new metadata stream. | |
10a50311 | 1002 | */ |
10a50311 JD |
1003 | consumer_stream_destroy(metadata_stream, NULL); |
1004 | metadata_channel->metadata_stream = NULL; | |
1005 | ||
1006 | error: | |
1007 | rcu_read_unlock(); | |
1008 | return ret; | |
1009 | } | |
1010 | ||
128708c3 JG |
1011 | static |
1012 | int get_current_subbuf_addr(struct lttng_consumer_stream *stream, | |
1013 | const char **addr) | |
1014 | { | |
1015 | int ret; | |
1016 | unsigned long mmap_offset; | |
1017 | const char *mmap_base; | |
1018 | ||
97535efa | 1019 | mmap_base = (const char *) lttng_ust_ctl_get_mmap_base(stream->ustream); |
128708c3 JG |
1020 | if (!mmap_base) { |
1021 | ERR("Failed to get mmap base for stream `%s`", | |
1022 | stream->name); | |
1023 | ret = -EPERM; | |
1024 | goto error; | |
1025 | } | |
1026 | ||
b623cb6a | 1027 | ret = lttng_ust_ctl_get_mmap_read_offset(stream->ustream, &mmap_offset); |
128708c3 JG |
1028 | if (ret != 0) { |
1029 | ERR("Failed to get mmap offset for stream `%s`", stream->name); | |
1030 | ret = -EINVAL; | |
1031 | goto error; | |
1032 | } | |
1033 | ||
1034 | *addr = mmap_base + mmap_offset; | |
1035 | error: | |
1036 | return ret; | |
1037 | ||
1038 | } | |
1039 | ||
10a50311 JD |
1040 | /* |
1041 | * Take a snapshot of all the stream of a channel. | |
d2956687 | 1042 | * RCU read-side lock and the channel lock must be held by the caller. |
10a50311 JD |
1043 | * |
1044 | * Returns 0 on success, < 0 on error | |
1045 | */ | |
3eb928aa MD |
1046 | static int snapshot_channel(struct lttng_consumer_channel *channel, |
1047 | uint64_t key, char *path, uint64_t relayd_id, | |
e098433c JG |
1048 | uint64_t nb_packets_per_stream, |
1049 | struct lttng_consumer_local_data *ctx) | |
10a50311 JD |
1050 | { |
1051 | int ret; | |
1052 | unsigned use_relayd = 0; | |
1053 | unsigned long consumed_pos, produced_pos; | |
10a50311 JD |
1054 | struct lttng_consumer_stream *stream; |
1055 | ||
a0377dfe FD |
1056 | LTTNG_ASSERT(path); |
1057 | LTTNG_ASSERT(ctx); | |
48b7cdc2 | 1058 | ASSERT_RCU_READ_LOCKED(); |
10a50311 JD |
1059 | |
1060 | rcu_read_lock(); | |
1061 | ||
1062 | if (relayd_id != (uint64_t) -1ULL) { | |
1063 | use_relayd = 1; | |
1064 | } | |
1065 | ||
a0377dfe | 1066 | LTTNG_ASSERT(!channel->monitor); |
6a00837f | 1067 | DBG("UST consumer snapshot channel %" PRIu64, key); |
10a50311 JD |
1068 | |
1069 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
1070 | health_code_update(); |
1071 | ||
10a50311 JD |
1072 | /* Lock stream because we are about to change its state. */ |
1073 | pthread_mutex_lock(&stream->lock); | |
a0377dfe | 1074 | LTTNG_ASSERT(channel->trace_chunk); |
d2956687 JG |
1075 | if (!lttng_trace_chunk_get(channel->trace_chunk)) { |
1076 | /* | |
1077 | * Can't happen barring an internal error as the channel | |
1078 | * holds a reference to the trace chunk. | |
1079 | */ | |
1080 | ERR("Failed to acquire reference to channel's trace chunk"); | |
1081 | ret = -1; | |
1082 | goto error_unlock; | |
1083 | } | |
a0377dfe | 1084 | LTTNG_ASSERT(!stream->trace_chunk); |
d2956687 JG |
1085 | stream->trace_chunk = channel->trace_chunk; |
1086 | ||
10a50311 JD |
1087 | stream->net_seq_idx = relayd_id; |
1088 | ||
1089 | if (use_relayd) { | |
1090 | ret = consumer_send_relayd_stream(stream, path); | |
1091 | if (ret < 0) { | |
1092 | goto error_unlock; | |
1093 | } | |
1094 | } else { | |
d2956687 JG |
1095 | ret = consumer_stream_create_output_files(stream, |
1096 | false); | |
10a50311 JD |
1097 | if (ret < 0) { |
1098 | goto error_unlock; | |
1099 | } | |
d2956687 JG |
1100 | DBG("UST consumer snapshot stream (%" PRIu64 ")", |
1101 | stream->key); | |
10a50311 JD |
1102 | } |
1103 | ||
d4d80f77 MD |
1104 | /* |
1105 | * If tracing is active, we want to perform a "full" buffer flush. | |
1106 | * Else, if quiescent, it has already been done by the prior stop. | |
1107 | */ | |
1108 | if (!stream->quiescent) { | |
881fc67f MD |
1109 | ret = lttng_ust_ctl_flush_buffer(stream->ustream, 0); |
1110 | if (ret < 0) { | |
1111 | ERR("Failed to flush buffer during snapshot of channel: channel key = %" PRIu64 ", channel name = '%s'", | |
1112 | channel->key, channel->name); | |
1113 | goto error_unlock; | |
1114 | } | |
d4d80f77 | 1115 | } |
10a50311 JD |
1116 | |
1117 | ret = lttng_ustconsumer_take_snapshot(stream); | |
1118 | if (ret < 0) { | |
1119 | ERR("Taking UST snapshot"); | |
1120 | goto error_unlock; | |
1121 | } | |
1122 | ||
1123 | ret = lttng_ustconsumer_get_produced_snapshot(stream, &produced_pos); | |
1124 | if (ret < 0) { | |
1125 | ERR("Produced UST snapshot position"); | |
1126 | goto error_unlock; | |
1127 | } | |
1128 | ||
1129 | ret = lttng_ustconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
1130 | if (ret < 0) { | |
1131 | ERR("Consumerd UST snapshot position"); | |
1132 | goto error_unlock; | |
1133 | } | |
1134 | ||
5c786ded JD |
1135 | /* |
1136 | * The original value is sent back if max stream size is larger than | |
d07ceecd | 1137 | * the possible size of the snapshot. Also, we assume that the session |
5c786ded JD |
1138 | * daemon should never send a maximum stream size that is lower than |
1139 | * subbuffer size. | |
1140 | */ | |
d07ceecd MD |
1141 | consumed_pos = consumer_get_consume_start_pos(consumed_pos, |
1142 | produced_pos, nb_packets_per_stream, | |
1143 | stream->max_sb_size); | |
5c786ded | 1144 | |
9377d830 | 1145 | while ((long) (consumed_pos - produced_pos) < 0) { |
10a50311 JD |
1146 | ssize_t read_len; |
1147 | unsigned long len, padded_len; | |
128708c3 | 1148 | const char *subbuf_addr; |
fd424d99 | 1149 | struct lttng_buffer_view subbuf_view; |
10a50311 | 1150 | |
9ce5646a MD |
1151 | health_code_update(); |
1152 | ||
10a50311 JD |
1153 | DBG("UST consumer taking snapshot at pos %lu", consumed_pos); |
1154 | ||
b623cb6a | 1155 | ret = lttng_ust_ctl_get_subbuf(stream->ustream, &consumed_pos); |
10a50311 JD |
1156 | if (ret < 0) { |
1157 | if (ret != -EAGAIN) { | |
b623cb6a | 1158 | PERROR("lttng_ust_ctl_get_subbuf snapshot"); |
10a50311 JD |
1159 | goto error_close_stream; |
1160 | } | |
1161 | DBG("UST consumer get subbuf failed. Skipping it."); | |
1162 | consumed_pos += stream->max_sb_size; | |
ddc93ee4 | 1163 | stream->chan->lost_packets++; |
10a50311 JD |
1164 | continue; |
1165 | } | |
1166 | ||
b623cb6a | 1167 | ret = lttng_ust_ctl_get_subbuf_size(stream->ustream, &len); |
10a50311 | 1168 | if (ret < 0) { |
b623cb6a | 1169 | ERR("Snapshot lttng_ust_ctl_get_subbuf_size"); |
10a50311 JD |
1170 | goto error_put_subbuf; |
1171 | } | |
1172 | ||
b623cb6a | 1173 | ret = lttng_ust_ctl_get_padded_subbuf_size(stream->ustream, &padded_len); |
10a50311 | 1174 | if (ret < 0) { |
b623cb6a | 1175 | ERR("Snapshot lttng_ust_ctl_get_padded_subbuf_size"); |
10a50311 JD |
1176 | goto error_put_subbuf; |
1177 | } | |
1178 | ||
128708c3 JG |
1179 | ret = get_current_subbuf_addr(stream, &subbuf_addr); |
1180 | if (ret) { | |
1181 | goto error_put_subbuf; | |
1182 | } | |
1183 | ||
fd424d99 JG |
1184 | subbuf_view = lttng_buffer_view_init( |
1185 | subbuf_addr, 0, padded_len); | |
f5ba75b4 | 1186 | read_len = lttng_consumer_on_read_subbuffer_mmap( |
6f9449c2 | 1187 | stream, &subbuf_view, padded_len - len); |
10a50311 JD |
1188 | if (use_relayd) { |
1189 | if (read_len != len) { | |
56591bac | 1190 | ret = -EPERM; |
10a50311 JD |
1191 | goto error_put_subbuf; |
1192 | } | |
1193 | } else { | |
1194 | if (read_len != padded_len) { | |
56591bac | 1195 | ret = -EPERM; |
10a50311 JD |
1196 | goto error_put_subbuf; |
1197 | } | |
1198 | } | |
1199 | ||
b623cb6a | 1200 | ret = lttng_ust_ctl_put_subbuf(stream->ustream); |
10a50311 | 1201 | if (ret < 0) { |
b623cb6a | 1202 | ERR("Snapshot lttng_ust_ctl_put_subbuf"); |
10a50311 JD |
1203 | goto error_close_stream; |
1204 | } | |
1205 | consumed_pos += stream->max_sb_size; | |
1206 | } | |
1207 | ||
1208 | /* Simply close the stream so we can use it on the next snapshot. */ | |
1209 | consumer_stream_close(stream); | |
1210 | pthread_mutex_unlock(&stream->lock); | |
1211 | } | |
1212 | ||
1213 | rcu_read_unlock(); | |
1214 | return 0; | |
1215 | ||
1216 | error_put_subbuf: | |
b623cb6a MJ |
1217 | if (lttng_ust_ctl_put_subbuf(stream->ustream) < 0) { |
1218 | ERR("Snapshot lttng_ust_ctl_put_subbuf"); | |
10a50311 JD |
1219 | } |
1220 | error_close_stream: | |
1221 | consumer_stream_close(stream); | |
1222 | error_unlock: | |
1223 | pthread_mutex_unlock(&stream->lock); | |
10a50311 | 1224 | rcu_read_unlock(); |
d88aee68 DG |
1225 | return ret; |
1226 | } | |
1227 | ||
b1316da1 JG |
1228 | static |
1229 | void metadata_stream_reset_cache_consumed_position( | |
1230 | struct lttng_consumer_stream *stream) | |
1231 | { | |
1232 | ASSERT_LOCKED(stream->lock); | |
1233 | ||
1234 | DBG("Reset metadata cache of session %" PRIu64, | |
1235 | stream->chan->session_id); | |
1236 | stream->ust_metadata_pushed = 0; | |
1237 | } | |
1238 | ||
331744e3 | 1239 | /* |
c585821b MD |
1240 | * Receive the metadata updates from the sessiond. Supports receiving |
1241 | * overlapping metadata, but is needs to always belong to a contiguous | |
1242 | * range starting from 0. | |
1243 | * Be careful about the locks held when calling this function: it needs | |
1244 | * the metadata cache flush to concurrently progress in order to | |
1245 | * complete. | |
331744e3 JD |
1246 | */ |
1247 | int lttng_ustconsumer_recv_metadata(int sock, uint64_t key, uint64_t offset, | |
93ec662e JD |
1248 | uint64_t len, uint64_t version, |
1249 | struct lttng_consumer_channel *channel, int timer, int wait) | |
331744e3 | 1250 | { |
0c759fc9 | 1251 | int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
331744e3 | 1252 | char *metadata_str; |
b1316da1 | 1253 | enum consumer_metadata_cache_write_status cache_write_status; |
331744e3 | 1254 | |
8fd623e0 | 1255 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, len); |
331744e3 | 1256 | |
64803277 | 1257 | metadata_str = calloc<char>(len); |
331744e3 JD |
1258 | if (!metadata_str) { |
1259 | PERROR("zmalloc metadata string"); | |
1260 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; | |
1261 | goto end; | |
1262 | } | |
1263 | ||
9ce5646a MD |
1264 | health_code_update(); |
1265 | ||
331744e3 JD |
1266 | /* Receive metadata string. */ |
1267 | ret = lttcomm_recv_unix_sock(sock, metadata_str, len); | |
1268 | if (ret < 0) { | |
1269 | /* Session daemon is dead so return gracefully. */ | |
1270 | ret_code = ret; | |
1271 | goto end_free; | |
1272 | } | |
1273 | ||
9ce5646a MD |
1274 | health_code_update(); |
1275 | ||
331744e3 | 1276 | pthread_mutex_lock(&channel->metadata_cache->lock); |
b1316da1 | 1277 | cache_write_status = consumer_metadata_cache_write( |
a25d34bc JG |
1278 | channel->metadata_cache, offset, len, version, |
1279 | metadata_str); | |
3bdc49f3 | 1280 | pthread_mutex_unlock(&channel->metadata_cache->lock); |
b1316da1 JG |
1281 | switch (cache_write_status) { |
1282 | case CONSUMER_METADATA_CACHE_WRITE_STATUS_NO_CHANGE: | |
1283 | /* | |
1284 | * The write entirely overlapped with existing contents of the | |
1285 | * same metadata version (same content); there is nothing to do. | |
1286 | */ | |
1287 | break; | |
1288 | case CONSUMER_METADATA_CACHE_WRITE_STATUS_INVALIDATED: | |
1289 | /* | |
1290 | * The metadata cache was invalidated (previously pushed | |
1291 | * content has been overwritten). Reset the stream's consumed | |
1292 | * metadata position to ensure the metadata poll thread consumes | |
1293 | * the whole cache. | |
1294 | */ | |
947bd097 JR |
1295 | |
1296 | /* | |
1297 | * channel::metadata_stream can be null when the metadata | |
1298 | * channel is under a snapshot session type. No need to update | |
1299 | * the stream position in that scenario. | |
1300 | */ | |
1301 | if (channel->metadata_stream != NULL) { | |
1302 | pthread_mutex_lock(&channel->metadata_stream->lock); | |
1303 | metadata_stream_reset_cache_consumed_position( | |
1304 | channel->metadata_stream); | |
1305 | pthread_mutex_unlock(&channel->metadata_stream->lock); | |
1306 | } else { | |
1307 | /* Validate we are in snapshot mode. */ | |
1308 | LTTNG_ASSERT(!channel->monitor); | |
1309 | } | |
b1316da1 JG |
1310 | /* Fall-through. */ |
1311 | case CONSUMER_METADATA_CACHE_WRITE_STATUS_APPENDED_CONTENT: | |
1312 | /* | |
1313 | * In both cases, the metadata poll thread has new data to | |
1314 | * consume. | |
1315 | */ | |
1316 | ret = consumer_metadata_wakeup_pipe(channel); | |
1317 | if (ret) { | |
1318 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
1319 | goto end_free; | |
1320 | } | |
1321 | break; | |
1322 | case CONSUMER_METADATA_CACHE_WRITE_STATUS_ERROR: | |
331744e3 JD |
1323 | /* Unable to handle metadata. Notify session daemon. */ |
1324 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
a32bd775 DG |
1325 | /* |
1326 | * Skip metadata flush on write error since the offset and len might | |
1327 | * not have been updated which could create an infinite loop below when | |
1328 | * waiting for the metadata cache to be flushed. | |
1329 | */ | |
a32bd775 | 1330 | goto end_free; |
b1316da1 JG |
1331 | default: |
1332 | abort(); | |
331744e3 | 1333 | } |
331744e3 | 1334 | |
94d49140 JD |
1335 | if (!wait) { |
1336 | goto end_free; | |
1337 | } | |
5e41ebe1 | 1338 | while (consumer_metadata_cache_flushed(channel, offset + len, timer)) { |
331744e3 | 1339 | DBG("Waiting for metadata to be flushed"); |
9ce5646a MD |
1340 | |
1341 | health_code_update(); | |
1342 | ||
331744e3 JD |
1343 | usleep(DEFAULT_METADATA_AVAILABILITY_WAIT_TIME); |
1344 | } | |
1345 | ||
1346 | end_free: | |
1347 | free(metadata_str); | |
1348 | end: | |
1349 | return ret_code; | |
1350 | } | |
1351 | ||
4cbc1a04 DG |
1352 | /* |
1353 | * Receive command from session daemon and process it. | |
1354 | * | |
1355 | * Return 1 on success else a negative value or 0. | |
1356 | */ | |
3bd1e081 MD |
1357 | int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
1358 | int sock, struct pollfd *consumer_sockpoll) | |
1359 | { | |
594c7c00 | 1360 | int ret_func; |
0c759fc9 | 1361 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
3bd1e081 | 1362 | struct lttcomm_consumer_msg msg; |
ffe60014 | 1363 | struct lttng_consumer_channel *channel = NULL; |
3bd1e081 | 1364 | |
9ce5646a MD |
1365 | health_code_update(); |
1366 | ||
594c7c00 SM |
1367 | { |
1368 | ssize_t ret_recv; | |
1369 | ||
1370 | ret_recv = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); | |
1371 | if (ret_recv != sizeof(msg)) { | |
1372 | DBG("Consumer received unexpected message size %zd (expects %zu)", | |
1373 | ret_recv, sizeof(msg)); | |
1374 | /* | |
1375 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
1376 | * since the caller handles this. | |
1377 | */ | |
1378 | if (ret_recv > 0) { | |
1379 | lttng_consumer_send_error(ctx, | |
1380 | LTTCOMM_CONSUMERD_ERROR_RECV_CMD); | |
1381 | ret_recv = -1; | |
1382 | } | |
1383 | return ret_recv; | |
489f70e9 | 1384 | } |
3bd1e081 | 1385 | } |
9ce5646a MD |
1386 | |
1387 | health_code_update(); | |
1388 | ||
84382d49 | 1389 | /* deprecated */ |
a0377dfe | 1390 | LTTNG_ASSERT(msg.cmd_type != LTTNG_CONSUMER_STOP); |
3bd1e081 | 1391 | |
9ce5646a MD |
1392 | health_code_update(); |
1393 | ||
3f8e211f | 1394 | /* relayd needs RCU read-side lock */ |
b0b335c8 MD |
1395 | rcu_read_lock(); |
1396 | ||
3bd1e081 | 1397 | switch (msg.cmd_type) { |
00e2e675 DG |
1398 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
1399 | { | |
4222116f JR |
1400 | uint32_t major = msg.u.relayd_sock.major; |
1401 | uint32_t minor = msg.u.relayd_sock.minor; | |
1402 | enum lttcomm_sock_proto protocol = | |
1403 | (enum lttcomm_sock_proto) msg.u.relayd_sock | |
1404 | .relayd_socket_protocol; | |
1405 | ||
f50f23d9 | 1406 | /* Session daemon status message are handled in the following call. */ |
2527bf85 | 1407 | consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
4222116f JR |
1408 | msg.u.relayd_sock.type, ctx, sock, |
1409 | consumer_sockpoll, msg.u.relayd_sock.session_id, | |
1410 | msg.u.relayd_sock.relayd_session_id, major, | |
1411 | minor, protocol); | |
00e2e675 DG |
1412 | goto end_nosignal; |
1413 | } | |
173af62f DG |
1414 | case LTTNG_CONSUMER_DESTROY_RELAYD: |
1415 | { | |
a6ba4fe1 | 1416 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
173af62f DG |
1417 | struct consumer_relayd_sock_pair *relayd; |
1418 | ||
a6ba4fe1 | 1419 | DBG("UST consumer destroying relayd %" PRIu64, index); |
173af62f DG |
1420 | |
1421 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 1422 | relayd = consumer_find_relayd(index); |
173af62f | 1423 | if (relayd == NULL) { |
3448e266 | 1424 | DBG("Unable to find relayd %" PRIu64, index); |
e462382a | 1425 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
173af62f DG |
1426 | } |
1427 | ||
a6ba4fe1 DG |
1428 | /* |
1429 | * Each relayd socket pair has a refcount of stream attached to it | |
1430 | * which tells if the relayd is still active or not depending on the | |
1431 | * refcount value. | |
1432 | * | |
1433 | * This will set the destroy flag of the relayd object and destroy it | |
1434 | * if the refcount reaches zero when called. | |
1435 | * | |
1436 | * The destroy can happen either here or when a stream fd hangs up. | |
1437 | */ | |
f50f23d9 DG |
1438 | if (relayd) { |
1439 | consumer_flag_relayd_for_destroy(relayd); | |
1440 | } | |
1441 | ||
d88aee68 | 1442 | goto end_msg_sessiond; |
173af62f | 1443 | } |
3bd1e081 MD |
1444 | case LTTNG_CONSUMER_UPDATE_STREAM: |
1445 | { | |
3f8e211f | 1446 | rcu_read_unlock(); |
7ad0a0cb | 1447 | return -ENOSYS; |
3bd1e081 | 1448 | } |
6d805429 | 1449 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 1450 | { |
594c7c00 SM |
1451 | int is_data_pending; |
1452 | ssize_t ret_send; | |
6d805429 | 1453 | uint64_t id = msg.u.data_pending.session_id; |
ca22feea | 1454 | |
6d805429 | 1455 | DBG("UST consumer data pending command for id %" PRIu64, id); |
ca22feea | 1456 | |
3be74084 | 1457 | is_data_pending = consumer_data_pending(id); |
ca22feea DG |
1458 | |
1459 | /* Send back returned value to session daemon */ | |
594c7c00 | 1460 | ret_send = lttcomm_send_unix_sock(sock, &is_data_pending, |
3be74084 | 1461 | sizeof(is_data_pending)); |
594c7c00 SM |
1462 | if (ret_send < 0) { |
1463 | DBG("Error when sending the data pending ret code: %zd", | |
1464 | ret_send); | |
489f70e9 | 1465 | goto error_fatal; |
ca22feea | 1466 | } |
f50f23d9 DG |
1467 | |
1468 | /* | |
1469 | * No need to send back a status message since the data pending | |
1470 | * returned value is the response. | |
1471 | */ | |
ca22feea | 1472 | break; |
53632229 | 1473 | } |
ffe60014 DG |
1474 | case LTTNG_CONSUMER_ASK_CHANNEL_CREATION: |
1475 | { | |
594c7c00 | 1476 | int ret_ask_channel, ret_add_channel, ret_send; |
b623cb6a | 1477 | struct lttng_ust_ctl_consumer_channel_attr attr; |
d2956687 JG |
1478 | const uint64_t chunk_id = msg.u.ask_channel.chunk_id.value; |
1479 | const struct lttng_credentials buffer_credentials = { | |
ff588497 JR |
1480 | .uid = LTTNG_OPTIONAL_INIT_VALUE(msg.u.ask_channel.buffer_credentials.uid), |
1481 | .gid = LTTNG_OPTIONAL_INIT_VALUE(msg.u.ask_channel.buffer_credentials.gid), | |
d2956687 | 1482 | }; |
ffe60014 DG |
1483 | |
1484 | /* Create a plain object and reserve a channel key. */ | |
a2814ea7 JG |
1485 | channel = consumer_allocate_channel( |
1486 | msg.u.ask_channel.key, | |
1487 | msg.u.ask_channel.session_id, | |
d2956687 JG |
1488 | msg.u.ask_channel.chunk_id.is_set ? |
1489 | &chunk_id : NULL, | |
1490 | msg.u.ask_channel.pathname, | |
1491 | msg.u.ask_channel.name, | |
1492 | msg.u.ask_channel.relayd_id, | |
1624d5b7 JD |
1493 | (enum lttng_event_output) msg.u.ask_channel.output, |
1494 | msg.u.ask_channel.tracefile_size, | |
2bba9e53 | 1495 | msg.u.ask_channel.tracefile_count, |
1950109e | 1496 | msg.u.ask_channel.session_id_per_pid, |
ecc48a90 | 1497 | msg.u.ask_channel.monitor, |
d7ba1388 | 1498 | msg.u.ask_channel.live_timer_interval, |
a2814ea7 | 1499 | msg.u.ask_channel.is_live, |
3d071855 | 1500 | msg.u.ask_channel.root_shm_path, |
d7ba1388 | 1501 | msg.u.ask_channel.shm_path); |
ffe60014 DG |
1502 | if (!channel) { |
1503 | goto end_channel_error; | |
1504 | } | |
1505 | ||
d2956687 JG |
1506 | LTTNG_OPTIONAL_SET(&channel->buffer_credentials, |
1507 | buffer_credentials); | |
1508 | ||
567eb353 DG |
1509 | /* |
1510 | * Assign UST application UID to the channel. This value is ignored for | |
1511 | * per PID buffers. This is specific to UST thus setting this after the | |
1512 | * allocation. | |
1513 | */ | |
1514 | channel->ust_app_uid = msg.u.ask_channel.ust_app_uid; | |
1515 | ||
ffe60014 DG |
1516 | /* Build channel attributes from received message. */ |
1517 | attr.subbuf_size = msg.u.ask_channel.subbuf_size; | |
1518 | attr.num_subbuf = msg.u.ask_channel.num_subbuf; | |
1519 | attr.overwrite = msg.u.ask_channel.overwrite; | |
1520 | attr.switch_timer_interval = msg.u.ask_channel.switch_timer_interval; | |
1521 | attr.read_timer_interval = msg.u.ask_channel.read_timer_interval; | |
7972aab2 | 1522 | attr.chan_id = msg.u.ask_channel.chan_id; |
ffe60014 | 1523 | memcpy(attr.uuid, msg.u.ask_channel.uuid, sizeof(attr.uuid)); |
491d1539 | 1524 | attr.blocking_timeout= msg.u.ask_channel.blocking_timeout; |
ffe60014 | 1525 | |
0c759fc9 DG |
1526 | /* Match channel buffer type to the UST abi. */ |
1527 | switch (msg.u.ask_channel.output) { | |
1528 | case LTTNG_EVENT_MMAP: | |
1529 | default: | |
fc4b93fa | 1530 | attr.output = LTTNG_UST_ABI_MMAP; |
0c759fc9 DG |
1531 | break; |
1532 | } | |
1533 | ||
ffe60014 DG |
1534 | /* Translate and save channel type. */ |
1535 | switch (msg.u.ask_channel.type) { | |
fc4b93fa | 1536 | case LTTNG_UST_ABI_CHAN_PER_CPU: |
ffe60014 | 1537 | channel->type = CONSUMER_CHANNEL_TYPE_DATA; |
fc4b93fa | 1538 | attr.type = LTTNG_UST_ABI_CHAN_PER_CPU; |
8633d6e3 MD |
1539 | /* |
1540 | * Set refcount to 1 for owner. Below, we will | |
1541 | * pass ownership to the | |
1542 | * consumer_thread_channel_poll() thread. | |
1543 | */ | |
1544 | channel->refcount = 1; | |
ffe60014 | 1545 | break; |
fc4b93fa | 1546 | case LTTNG_UST_ABI_CHAN_METADATA: |
ffe60014 | 1547 | channel->type = CONSUMER_CHANNEL_TYPE_METADATA; |
fc4b93fa | 1548 | attr.type = LTTNG_UST_ABI_CHAN_METADATA; |
ffe60014 DG |
1549 | break; |
1550 | default: | |
a0377dfe | 1551 | abort(); |
ffe60014 DG |
1552 | goto error_fatal; |
1553 | }; | |
1554 | ||
9ce5646a MD |
1555 | health_code_update(); |
1556 | ||
594c7c00 SM |
1557 | ret_ask_channel = ask_channel(ctx, channel, &attr); |
1558 | if (ret_ask_channel < 0) { | |
ffe60014 DG |
1559 | goto end_channel_error; |
1560 | } | |
1561 | ||
fc4b93fa | 1562 | if (msg.u.ask_channel.type == LTTNG_UST_ABI_CHAN_METADATA) { |
594c7c00 SM |
1563 | int ret_allocate; |
1564 | ||
1565 | ret_allocate = consumer_metadata_cache_allocate( | |
1566 | channel); | |
1567 | if (ret_allocate < 0) { | |
fc643247 MD |
1568 | ERR("Allocating metadata cache"); |
1569 | goto end_channel_error; | |
1570 | } | |
1571 | consumer_timer_switch_start(channel, attr.switch_timer_interval); | |
1572 | attr.switch_timer_interval = 0; | |
94d49140 | 1573 | } else { |
e9404c27 JG |
1574 | int monitor_start_ret; |
1575 | ||
94d49140 JD |
1576 | consumer_timer_live_start(channel, |
1577 | msg.u.ask_channel.live_timer_interval); | |
e9404c27 JG |
1578 | monitor_start_ret = consumer_timer_monitor_start( |
1579 | channel, | |
1580 | msg.u.ask_channel.monitor_timer_interval); | |
1581 | if (monitor_start_ret < 0) { | |
1582 | ERR("Starting channel monitoring timer failed"); | |
1583 | goto end_channel_error; | |
1584 | } | |
fc643247 MD |
1585 | } |
1586 | ||
9ce5646a MD |
1587 | health_code_update(); |
1588 | ||
ffe60014 DG |
1589 | /* |
1590 | * Add the channel to the internal state AFTER all streams were created | |
1591 | * and successfully sent to session daemon. This way, all streams must | |
1592 | * be ready before this channel is visible to the threads. | |
fc643247 MD |
1593 | * If add_channel succeeds, ownership of the channel is |
1594 | * passed to consumer_thread_channel_poll(). | |
ffe60014 | 1595 | */ |
594c7c00 SM |
1596 | ret_add_channel = add_channel(channel, ctx); |
1597 | if (ret_add_channel < 0) { | |
fc4b93fa | 1598 | if (msg.u.ask_channel.type == LTTNG_UST_ABI_CHAN_METADATA) { |
ea88ca2a MD |
1599 | if (channel->switch_timer_enabled == 1) { |
1600 | consumer_timer_switch_stop(channel); | |
1601 | } | |
1602 | consumer_metadata_cache_destroy(channel); | |
1603 | } | |
d3e2ba59 JD |
1604 | if (channel->live_timer_enabled == 1) { |
1605 | consumer_timer_live_stop(channel); | |
1606 | } | |
e9404c27 JG |
1607 | if (channel->monitor_timer_enabled == 1) { |
1608 | consumer_timer_monitor_stop(channel); | |
1609 | } | |
ffe60014 DG |
1610 | goto end_channel_error; |
1611 | } | |
1612 | ||
9ce5646a MD |
1613 | health_code_update(); |
1614 | ||
ffe60014 DG |
1615 | /* |
1616 | * Channel and streams are now created. Inform the session daemon that | |
1617 | * everything went well and should wait to receive the channel and | |
1618 | * streams with ustctl API. | |
1619 | */ | |
594c7c00 SM |
1620 | ret_send = consumer_send_status_channel(sock, channel); |
1621 | if (ret_send < 0) { | |
ffe60014 | 1622 | /* |
489f70e9 | 1623 | * There is probably a problem on the socket. |
ffe60014 | 1624 | */ |
489f70e9 | 1625 | goto error_fatal; |
ffe60014 DG |
1626 | } |
1627 | ||
1628 | break; | |
1629 | } | |
1630 | case LTTNG_CONSUMER_GET_CHANNEL: | |
1631 | { | |
1632 | int ret, relayd_err = 0; | |
d88aee68 | 1633 | uint64_t key = msg.u.get_channel.key; |
594c7c00 | 1634 | struct lttng_consumer_channel *found_channel; |
ffe60014 | 1635 | |
594c7c00 SM |
1636 | found_channel = consumer_find_channel(key); |
1637 | if (!found_channel) { | |
8fd623e0 | 1638 | ERR("UST consumer get channel key %" PRIu64 " not found", key); |
e462382a | 1639 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
f3a1fc7b | 1640 | goto end_get_channel; |
ffe60014 DG |
1641 | } |
1642 | ||
9ce5646a MD |
1643 | health_code_update(); |
1644 | ||
a3a86f35 | 1645 | /* Send the channel to sessiond (and relayd, if applicable). */ |
594c7c00 SM |
1646 | ret = send_channel_to_sessiond_and_relayd( |
1647 | sock, found_channel, ctx, &relayd_err); | |
ffe60014 DG |
1648 | if (ret < 0) { |
1649 | if (relayd_err) { | |
1650 | /* | |
1651 | * We were unable to send to the relayd the stream so avoid | |
1652 | * sending back a fatal error to the thread since this is OK | |
f2a444f1 DG |
1653 | * and the consumer can continue its work. The above call |
1654 | * has sent the error status message to the sessiond. | |
ffe60014 | 1655 | */ |
f3a1fc7b | 1656 | goto end_get_channel_nosignal; |
ffe60014 DG |
1657 | } |
1658 | /* | |
1659 | * The communicaton was broken hence there is a bad state between | |
1660 | * the consumer and sessiond so stop everything. | |
1661 | */ | |
f3a1fc7b | 1662 | goto error_get_channel_fatal; |
ffe60014 DG |
1663 | } |
1664 | ||
9ce5646a MD |
1665 | health_code_update(); |
1666 | ||
10a50311 JD |
1667 | /* |
1668 | * In no monitor mode, the streams ownership is kept inside the channel | |
1669 | * so don't send them to the data thread. | |
1670 | */ | |
594c7c00 | 1671 | if (!found_channel->monitor) { |
f3a1fc7b | 1672 | goto end_get_channel; |
10a50311 JD |
1673 | } |
1674 | ||
594c7c00 | 1675 | ret = send_streams_to_thread(found_channel, ctx); |
d88aee68 DG |
1676 | if (ret < 0) { |
1677 | /* | |
1678 | * If we are unable to send the stream to the thread, there is | |
1679 | * a big problem so just stop everything. | |
1680 | */ | |
f3a1fc7b | 1681 | goto error_get_channel_fatal; |
ffe60014 | 1682 | } |
ffe60014 | 1683 | /* List MUST be empty after or else it could be reused. */ |
a0377dfe | 1684 | LTTNG_ASSERT(cds_list_empty(&found_channel->streams.head)); |
f3a1fc7b | 1685 | end_get_channel: |
d88aee68 | 1686 | goto end_msg_sessiond; |
f3a1fc7b JG |
1687 | error_get_channel_fatal: |
1688 | goto error_fatal; | |
1689 | end_get_channel_nosignal: | |
1690 | goto end_nosignal; | |
d88aee68 DG |
1691 | } |
1692 | case LTTNG_CONSUMER_DESTROY_CHANNEL: | |
1693 | { | |
1694 | uint64_t key = msg.u.destroy_channel.key; | |
d88aee68 | 1695 | |
a0cbdd2e MD |
1696 | /* |
1697 | * Only called if streams have not been sent to stream | |
1698 | * manager thread. However, channel has been sent to | |
1699 | * channel manager thread. | |
1700 | */ | |
1701 | notify_thread_del_channel(ctx, key); | |
d88aee68 | 1702 | goto end_msg_sessiond; |
ffe60014 | 1703 | } |
d88aee68 DG |
1704 | case LTTNG_CONSUMER_CLOSE_METADATA: |
1705 | { | |
1706 | int ret; | |
1707 | ||
1708 | ret = close_metadata(msg.u.close_metadata.key); | |
1709 | if (ret != 0) { | |
97535efa | 1710 | ret_code = (lttcomm_return_code) ret; |
d88aee68 DG |
1711 | } |
1712 | ||
1713 | goto end_msg_sessiond; | |
1714 | } | |
7972aab2 DG |
1715 | case LTTNG_CONSUMER_FLUSH_CHANNEL: |
1716 | { | |
1717 | int ret; | |
1718 | ||
1719 | ret = flush_channel(msg.u.flush_channel.key); | |
1720 | if (ret != 0) { | |
97535efa | 1721 | ret_code = (lttcomm_return_code) ret; |
7972aab2 DG |
1722 | } |
1723 | ||
1724 | goto end_msg_sessiond; | |
1725 | } | |
0dd01979 MD |
1726 | case LTTNG_CONSUMER_CLEAR_QUIESCENT_CHANNEL: |
1727 | { | |
1728 | int ret; | |
1729 | ||
1730 | ret = clear_quiescent_channel( | |
1731 | msg.u.clear_quiescent_channel.key); | |
1732 | if (ret != 0) { | |
97535efa | 1733 | ret_code = (lttcomm_return_code) ret; |
0dd01979 MD |
1734 | } |
1735 | ||
1736 | goto end_msg_sessiond; | |
1737 | } | |
d88aee68 | 1738 | case LTTNG_CONSUMER_PUSH_METADATA: |
ffe60014 DG |
1739 | { |
1740 | int ret; | |
d88aee68 | 1741 | uint64_t len = msg.u.push_metadata.len; |
d88aee68 | 1742 | uint64_t key = msg.u.push_metadata.key; |
331744e3 | 1743 | uint64_t offset = msg.u.push_metadata.target_offset; |
93ec662e | 1744 | uint64_t version = msg.u.push_metadata.version; |
594c7c00 | 1745 | struct lttng_consumer_channel *found_channel; |
ffe60014 | 1746 | |
8fd623e0 DG |
1747 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, |
1748 | len); | |
ffe60014 | 1749 | |
594c7c00 SM |
1750 | found_channel = consumer_find_channel(key); |
1751 | if (!found_channel) { | |
000baf6a DG |
1752 | /* |
1753 | * This is possible if the metadata creation on the consumer side | |
1754 | * is in flight vis-a-vis a concurrent push metadata from the | |
1755 | * session daemon. Simply return that the channel failed and the | |
1756 | * session daemon will handle that message correctly considering | |
1757 | * that this race is acceptable thus the DBG() statement here. | |
1758 | */ | |
1759 | DBG("UST consumer push metadata %" PRIu64 " not found", key); | |
1760 | ret_code = LTTCOMM_CONSUMERD_CHANNEL_FAIL; | |
a8ffe244 | 1761 | goto end_push_metadata_msg_sessiond; |
d88aee68 DG |
1762 | } |
1763 | ||
9ce5646a MD |
1764 | health_code_update(); |
1765 | ||
c585821b MD |
1766 | if (!len) { |
1767 | /* | |
1768 | * There is nothing to receive. We have simply | |
1769 | * checked whether the channel can be found. | |
1770 | */ | |
1771 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
a8ffe244 | 1772 | goto end_push_metadata_msg_sessiond; |
c585821b MD |
1773 | } |
1774 | ||
d88aee68 | 1775 | /* Tell session daemon we are ready to receive the metadata. */ |
0c759fc9 | 1776 | ret = consumer_send_status_msg(sock, LTTCOMM_CONSUMERD_SUCCESS); |
ffe60014 DG |
1777 | if (ret < 0) { |
1778 | /* Somehow, the session daemon is not responding anymore. */ | |
a8ffe244 | 1779 | goto error_push_metadata_fatal; |
d88aee68 DG |
1780 | } |
1781 | ||
9ce5646a MD |
1782 | health_code_update(); |
1783 | ||
d88aee68 | 1784 | /* Wait for more data. */ |
9ce5646a MD |
1785 | health_poll_entry(); |
1786 | ret = lttng_consumer_poll_socket(consumer_sockpoll); | |
1787 | health_poll_exit(); | |
84382d49 | 1788 | if (ret) { |
a8ffe244 | 1789 | goto error_push_metadata_fatal; |
d88aee68 DG |
1790 | } |
1791 | ||
9ce5646a MD |
1792 | health_code_update(); |
1793 | ||
594c7c00 SM |
1794 | ret = lttng_ustconsumer_recv_metadata(sock, key, offset, len, |
1795 | version, found_channel, 0, 1); | |
d88aee68 | 1796 | if (ret < 0) { |
331744e3 | 1797 | /* error receiving from sessiond */ |
a8ffe244 | 1798 | goto error_push_metadata_fatal; |
331744e3 | 1799 | } else { |
97535efa | 1800 | ret_code = (lttcomm_return_code) ret; |
a8ffe244 | 1801 | goto end_push_metadata_msg_sessiond; |
d88aee68 | 1802 | } |
a8ffe244 JG |
1803 | end_push_metadata_msg_sessiond: |
1804 | goto end_msg_sessiond; | |
1805 | error_push_metadata_fatal: | |
1806 | goto error_fatal; | |
d88aee68 DG |
1807 | } |
1808 | case LTTNG_CONSUMER_SETUP_METADATA: | |
1809 | { | |
1810 | int ret; | |
1811 | ||
1812 | ret = setup_metadata(ctx, msg.u.setup_metadata.key); | |
1813 | if (ret) { | |
97535efa | 1814 | ret_code = (lttcomm_return_code) ret; |
d88aee68 DG |
1815 | } |
1816 | goto end_msg_sessiond; | |
ffe60014 | 1817 | } |
6dc3064a DG |
1818 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
1819 | { | |
594c7c00 | 1820 | struct lttng_consumer_channel *found_channel; |
3eb928aa | 1821 | uint64_t key = msg.u.snapshot_channel.key; |
594c7c00 | 1822 | int ret_send; |
3eb928aa | 1823 | |
594c7c00 SM |
1824 | found_channel = consumer_find_channel(key); |
1825 | if (!found_channel) { | |
3eb928aa MD |
1826 | DBG("UST snapshot channel not found for key %" PRIu64, key); |
1827 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
10a50311 | 1828 | } else { |
3eb928aa | 1829 | if (msg.u.snapshot_channel.metadata) { |
594c7c00 SM |
1830 | int ret_snapshot; |
1831 | ||
1832 | ret_snapshot = snapshot_metadata(found_channel, | |
1833 | key, | |
3eb928aa MD |
1834 | msg.u.snapshot_channel.pathname, |
1835 | msg.u.snapshot_channel.relayd_id, | |
d2956687 | 1836 | ctx); |
594c7c00 | 1837 | if (ret_snapshot < 0) { |
3eb928aa MD |
1838 | ERR("Snapshot metadata failed"); |
1839 | ret_code = LTTCOMM_CONSUMERD_SNAPSHOT_FAILED; | |
1840 | } | |
1841 | } else { | |
594c7c00 SM |
1842 | int ret_snapshot; |
1843 | ||
1844 | ret_snapshot = snapshot_channel(found_channel, | |
1845 | key, | |
3eb928aa MD |
1846 | msg.u.snapshot_channel.pathname, |
1847 | msg.u.snapshot_channel.relayd_id, | |
594c7c00 SM |
1848 | msg.u.snapshot_channel |
1849 | .nb_packets_per_stream, | |
3eb928aa | 1850 | ctx); |
594c7c00 | 1851 | if (ret_snapshot < 0) { |
3eb928aa MD |
1852 | ERR("Snapshot channel failed"); |
1853 | ret_code = LTTCOMM_CONSUMERD_SNAPSHOT_FAILED; | |
1854 | } | |
10a50311 JD |
1855 | } |
1856 | } | |
9ce5646a | 1857 | health_code_update(); |
594c7c00 SM |
1858 | ret_send = consumer_send_status_msg(sock, ret_code); |
1859 | if (ret_send < 0) { | |
6dc3064a DG |
1860 | /* Somehow, the session daemon is not responding anymore. */ |
1861 | goto end_nosignal; | |
1862 | } | |
9ce5646a | 1863 | health_code_update(); |
6dc3064a DG |
1864 | break; |
1865 | } | |
fb83fe64 JD |
1866 | case LTTNG_CONSUMER_DISCARDED_EVENTS: |
1867 | { | |
beb59458 MJ |
1868 | int ret = 0; |
1869 | uint64_t discarded_events; | |
fb83fe64 JD |
1870 | struct lttng_ht_iter iter; |
1871 | struct lttng_ht *ht; | |
1872 | struct lttng_consumer_stream *stream; | |
1873 | uint64_t id = msg.u.discarded_events.session_id; | |
1874 | uint64_t key = msg.u.discarded_events.channel_key; | |
1875 | ||
1876 | DBG("UST consumer discarded events command for session id %" | |
1877 | PRIu64, id); | |
1878 | rcu_read_lock(); | |
fa29bfbf | 1879 | pthread_mutex_lock(&the_consumer_data.lock); |
fb83fe64 | 1880 | |
fa29bfbf | 1881 | ht = the_consumer_data.stream_list_ht; |
fb83fe64 JD |
1882 | |
1883 | /* | |
1884 | * We only need a reference to the channel, but they are not | |
1885 | * directly indexed, so we just use the first matching stream | |
1886 | * to extract the information we need, we default to 0 if not | |
1887 | * found (no events are dropped if the channel is not yet in | |
1888 | * use). | |
1889 | */ | |
beb59458 | 1890 | discarded_events = 0; |
fb83fe64 JD |
1891 | cds_lfht_for_each_entry_duplicate(ht->ht, |
1892 | ht->hash_fct(&id, lttng_ht_seed), | |
1893 | ht->match_fct, &id, | |
1894 | &iter.iter, stream, node_session_id.node) { | |
1895 | if (stream->chan->key == key) { | |
beb59458 | 1896 | discarded_events = stream->chan->discarded_events; |
fb83fe64 JD |
1897 | break; |
1898 | } | |
1899 | } | |
fa29bfbf | 1900 | pthread_mutex_unlock(&the_consumer_data.lock); |
fb83fe64 JD |
1901 | rcu_read_unlock(); |
1902 | ||
1903 | DBG("UST consumer discarded events command for session id %" | |
1904 | PRIu64 ", channel key %" PRIu64, id, key); | |
1905 | ||
1906 | health_code_update(); | |
1907 | ||
1908 | /* Send back returned value to session daemon */ | |
beb59458 | 1909 | ret = lttcomm_send_unix_sock(sock, &discarded_events, sizeof(discarded_events)); |
fb83fe64 JD |
1910 | if (ret < 0) { |
1911 | PERROR("send discarded events"); | |
1912 | goto error_fatal; | |
1913 | } | |
1914 | ||
1915 | break; | |
1916 | } | |
1917 | case LTTNG_CONSUMER_LOST_PACKETS: | |
1918 | { | |
9a06e8d4 JG |
1919 | int ret; |
1920 | uint64_t lost_packets; | |
fb83fe64 JD |
1921 | struct lttng_ht_iter iter; |
1922 | struct lttng_ht *ht; | |
1923 | struct lttng_consumer_stream *stream; | |
1924 | uint64_t id = msg.u.lost_packets.session_id; | |
1925 | uint64_t key = msg.u.lost_packets.channel_key; | |
1926 | ||
1927 | DBG("UST consumer lost packets command for session id %" | |
1928 | PRIu64, id); | |
1929 | rcu_read_lock(); | |
fa29bfbf | 1930 | pthread_mutex_lock(&the_consumer_data.lock); |
fb83fe64 | 1931 | |
fa29bfbf | 1932 | ht = the_consumer_data.stream_list_ht; |
fb83fe64 JD |
1933 | |
1934 | /* | |
1935 | * We only need a reference to the channel, but they are not | |
1936 | * directly indexed, so we just use the first matching stream | |
1937 | * to extract the information we need, we default to 0 if not | |
1938 | * found (no packets lost if the channel is not yet in use). | |
1939 | */ | |
9a06e8d4 | 1940 | lost_packets = 0; |
fb83fe64 JD |
1941 | cds_lfht_for_each_entry_duplicate(ht->ht, |
1942 | ht->hash_fct(&id, lttng_ht_seed), | |
1943 | ht->match_fct, &id, | |
1944 | &iter.iter, stream, node_session_id.node) { | |
1945 | if (stream->chan->key == key) { | |
9a06e8d4 | 1946 | lost_packets = stream->chan->lost_packets; |
fb83fe64 JD |
1947 | break; |
1948 | } | |
1949 | } | |
fa29bfbf | 1950 | pthread_mutex_unlock(&the_consumer_data.lock); |
fb83fe64 JD |
1951 | rcu_read_unlock(); |
1952 | ||
1953 | DBG("UST consumer lost packets command for session id %" | |
1954 | PRIu64 ", channel key %" PRIu64, id, key); | |
1955 | ||
1956 | health_code_update(); | |
1957 | ||
1958 | /* Send back returned value to session daemon */ | |
9a06e8d4 JG |
1959 | ret = lttcomm_send_unix_sock(sock, &lost_packets, |
1960 | sizeof(lost_packets)); | |
fb83fe64 JD |
1961 | if (ret < 0) { |
1962 | PERROR("send lost packets"); | |
1963 | goto error_fatal; | |
1964 | } | |
1965 | ||
1966 | break; | |
1967 | } | |
b3530820 JG |
1968 | case LTTNG_CONSUMER_SET_CHANNEL_MONITOR_PIPE: |
1969 | { | |
594c7c00 SM |
1970 | int channel_monitor_pipe, ret_send, |
1971 | ret_set_channel_monitor_pipe; | |
1972 | ssize_t ret_recv; | |
b3530820 JG |
1973 | |
1974 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1975 | /* Successfully received the command's type. */ | |
594c7c00 SM |
1976 | ret_send = consumer_send_status_msg(sock, ret_code); |
1977 | if (ret_send < 0) { | |
b3530820 JG |
1978 | goto error_fatal; |
1979 | } | |
1980 | ||
594c7c00 SM |
1981 | ret_recv = lttcomm_recv_fds_unix_sock( |
1982 | sock, &channel_monitor_pipe, 1); | |
1983 | if (ret_recv != sizeof(channel_monitor_pipe)) { | |
b3530820 JG |
1984 | ERR("Failed to receive channel monitor pipe"); |
1985 | goto error_fatal; | |
1986 | } | |
1987 | ||
1988 | DBG("Received channel monitor pipe (%d)", channel_monitor_pipe); | |
594c7c00 SM |
1989 | ret_set_channel_monitor_pipe = |
1990 | consumer_timer_thread_set_channel_monitor_pipe( | |
1991 | channel_monitor_pipe); | |
1992 | if (!ret_set_channel_monitor_pipe) { | |
b3530820 | 1993 | int flags; |
594c7c00 | 1994 | int ret_fcntl; |
b3530820 JG |
1995 | |
1996 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1997 | /* Set the pipe as non-blocking. */ | |
594c7c00 SM |
1998 | ret_fcntl = fcntl(channel_monitor_pipe, F_GETFL, 0); |
1999 | if (ret_fcntl == -1) { | |
b3530820 JG |
2000 | PERROR("fcntl get flags of the channel monitoring pipe"); |
2001 | goto error_fatal; | |
2002 | } | |
594c7c00 | 2003 | flags = ret_fcntl; |
b3530820 | 2004 | |
594c7c00 | 2005 | ret_fcntl = fcntl(channel_monitor_pipe, F_SETFL, |
b3530820 | 2006 | flags | O_NONBLOCK); |
594c7c00 | 2007 | if (ret_fcntl == -1) { |
b3530820 JG |
2008 | PERROR("fcntl set O_NONBLOCK flag of the channel monitoring pipe"); |
2009 | goto error_fatal; | |
2010 | } | |
2011 | DBG("Channel monitor pipe set as non-blocking"); | |
2012 | } else { | |
2013 | ret_code = LTTCOMM_CONSUMERD_ALREADY_SET; | |
2014 | } | |
2015 | goto end_msg_sessiond; | |
2016 | } | |
b99a8d42 JD |
2017 | case LTTNG_CONSUMER_ROTATE_CHANNEL: |
2018 | { | |
594c7c00 | 2019 | struct lttng_consumer_channel *found_channel; |
92b7a7f8 | 2020 | uint64_t key = msg.u.rotate_channel.key; |
594c7c00 | 2021 | int ret_send_status; |
b99a8d42 | 2022 | |
594c7c00 SM |
2023 | found_channel = consumer_find_channel(key); |
2024 | if (!found_channel) { | |
92b7a7f8 MD |
2025 | DBG("Channel %" PRIu64 " not found", key); |
2026 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
2027 | } else { | |
594c7c00 SM |
2028 | int rotate_channel; |
2029 | ||
92b7a7f8 MD |
2030 | /* |
2031 | * Sample the rotate position of all the streams in | |
2032 | * this channel. | |
2033 | */ | |
594c7c00 SM |
2034 | rotate_channel = lttng_consumer_rotate_channel( |
2035 | found_channel, key, | |
f46376a1 | 2036 | msg.u.rotate_channel.relayd_id); |
594c7c00 | 2037 | if (rotate_channel < 0) { |
92b7a7f8 MD |
2038 | ERR("Rotate channel failed"); |
2039 | ret_code = LTTCOMM_CONSUMERD_ROTATION_FAIL; | |
2040 | } | |
b99a8d42 | 2041 | |
92b7a7f8 MD |
2042 | health_code_update(); |
2043 | } | |
594c7c00 SM |
2044 | |
2045 | ret_send_status = consumer_send_status_msg(sock, ret_code); | |
2046 | if (ret_send_status < 0) { | |
b99a8d42 | 2047 | /* Somehow, the session daemon is not responding anymore. */ |
41c7a76d | 2048 | goto end_rotate_channel_nosignal; |
b99a8d42 JD |
2049 | } |
2050 | ||
2051 | /* | |
2052 | * Rotate the streams that are ready right now. | |
2053 | * FIXME: this is a second consecutive iteration over the | |
2054 | * streams in a channel, there is probably a better way to | |
2055 | * handle this, but it needs to be after the | |
2056 | * consumer_send_status_msg() call. | |
2057 | */ | |
594c7c00 SM |
2058 | if (found_channel) { |
2059 | int ret_rotate_read_streams; | |
2060 | ||
2061 | ret_rotate_read_streams = | |
2062 | lttng_consumer_rotate_ready_streams( | |
f46376a1 | 2063 | found_channel, key); |
594c7c00 | 2064 | if (ret_rotate_read_streams < 0) { |
92b7a7f8 MD |
2065 | ERR("Rotate channel failed"); |
2066 | } | |
b99a8d42 JD |
2067 | } |
2068 | break; | |
41c7a76d JG |
2069 | end_rotate_channel_nosignal: |
2070 | goto end_nosignal; | |
b99a8d42 | 2071 | } |
5f3aff8b MD |
2072 | case LTTNG_CONSUMER_CLEAR_CHANNEL: |
2073 | { | |
594c7c00 | 2074 | struct lttng_consumer_channel *found_channel; |
5f3aff8b | 2075 | uint64_t key = msg.u.clear_channel.key; |
594c7c00 | 2076 | int ret_send_status; |
5f3aff8b | 2077 | |
594c7c00 SM |
2078 | found_channel = consumer_find_channel(key); |
2079 | if (!found_channel) { | |
5f3aff8b MD |
2080 | DBG("Channel %" PRIu64 " not found", key); |
2081 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
2082 | } else { | |
594c7c00 SM |
2083 | int ret_clear_channel; |
2084 | ||
2085 | ret_clear_channel = lttng_consumer_clear_channel( | |
2086 | found_channel); | |
2087 | if (ret_clear_channel) { | |
5f3aff8b | 2088 | ERR("Clear channel failed key %" PRIu64, key); |
97535efa | 2089 | ret_code = (lttcomm_return_code) ret_clear_channel; |
5f3aff8b MD |
2090 | } |
2091 | ||
2092 | health_code_update(); | |
2093 | } | |
594c7c00 SM |
2094 | ret_send_status = consumer_send_status_msg(sock, ret_code); |
2095 | if (ret_send_status < 0) { | |
5f3aff8b MD |
2096 | /* Somehow, the session daemon is not responding anymore. */ |
2097 | goto end_nosignal; | |
2098 | } | |
2099 | break; | |
2100 | } | |
d2956687 | 2101 | case LTTNG_CONSUMER_INIT: |
00fb02ac | 2102 | { |
594c7c00 | 2103 | int ret_send_status; |
328c2fe7 | 2104 | lttng_uuid sessiond_uuid; |
594c7c00 | 2105 | |
328c2fe7 JG |
2106 | std::copy(std::begin(msg.u.init.sessiond_uuid), std::end(msg.u.init.sessiond_uuid), |
2107 | sessiond_uuid.begin()); | |
2108 | ret_code = lttng_consumer_init_command(ctx, sessiond_uuid); | |
d88744a4 | 2109 | health_code_update(); |
594c7c00 SM |
2110 | ret_send_status = consumer_send_status_msg(sock, ret_code); |
2111 | if (ret_send_status < 0) { | |
d88744a4 JD |
2112 | /* Somehow, the session daemon is not responding anymore. */ |
2113 | goto end_nosignal; | |
2114 | } | |
2115 | break; | |
2116 | } | |
d2956687 | 2117 | case LTTNG_CONSUMER_CREATE_TRACE_CHUNK: |
d88744a4 | 2118 | { |
d2956687 | 2119 | const struct lttng_credentials credentials = { |
ff588497 JR |
2120 | .uid = LTTNG_OPTIONAL_INIT_VALUE(msg.u.create_trace_chunk.credentials.value.uid), |
2121 | .gid = LTTNG_OPTIONAL_INIT_VALUE(msg.u.create_trace_chunk.credentials.value.gid), | |
d2956687 JG |
2122 | }; |
2123 | const bool is_local_trace = | |
2124 | !msg.u.create_trace_chunk.relayd_id.is_set; | |
2125 | const uint64_t relayd_id = | |
2126 | msg.u.create_trace_chunk.relayd_id.value; | |
2127 | const char *chunk_override_name = | |
2128 | *msg.u.create_trace_chunk.override_name ? | |
2129 | msg.u.create_trace_chunk.override_name : | |
2130 | NULL; | |
cbf53d23 | 2131 | struct lttng_directory_handle *chunk_directory_handle = NULL; |
d88744a4 | 2132 | |
d2956687 JG |
2133 | /* |
2134 | * The session daemon will only provide a chunk directory file | |
2135 | * descriptor for local traces. | |
2136 | */ | |
2137 | if (is_local_trace) { | |
2138 | int chunk_dirfd; | |
594c7c00 SM |
2139 | int ret_send_status; |
2140 | ssize_t ret_recv; | |
19990ed5 | 2141 | |
d2956687 | 2142 | /* Acnowledge the reception of the command. */ |
594c7c00 SM |
2143 | ret_send_status = consumer_send_status_msg( |
2144 | sock, LTTCOMM_CONSUMERD_SUCCESS); | |
2145 | if (ret_send_status < 0) { | |
d2956687 JG |
2146 | /* Somehow, the session daemon is not responding anymore. */ |
2147 | goto end_nosignal; | |
2148 | } | |
92816cc3 | 2149 | |
5da88b0f MD |
2150 | /* |
2151 | * Receive trace chunk domain dirfd. | |
2152 | */ | |
594c7c00 SM |
2153 | ret_recv = lttcomm_recv_fds_unix_sock( |
2154 | sock, &chunk_dirfd, 1); | |
2155 | if (ret_recv != sizeof(chunk_dirfd)) { | |
5da88b0f | 2156 | ERR("Failed to receive trace chunk domain directory file descriptor"); |
d2956687 JG |
2157 | goto error_fatal; |
2158 | } | |
92816cc3 | 2159 | |
5da88b0f | 2160 | DBG("Received trace chunk domain directory fd (%d)", |
d2956687 | 2161 | chunk_dirfd); |
cbf53d23 | 2162 | chunk_directory_handle = lttng_directory_handle_create_from_dirfd( |
d2956687 | 2163 | chunk_dirfd); |
cbf53d23 | 2164 | if (!chunk_directory_handle) { |
5da88b0f | 2165 | ERR("Failed to initialize chunk domain directory handle from directory file descriptor"); |
d2956687 JG |
2166 | if (close(chunk_dirfd)) { |
2167 | PERROR("Failed to close chunk directory file descriptor"); | |
2168 | } | |
2169 | goto error_fatal; | |
2170 | } | |
92816cc3 JG |
2171 | } |
2172 | ||
d2956687 JG |
2173 | ret_code = lttng_consumer_create_trace_chunk( |
2174 | !is_local_trace ? &relayd_id : NULL, | |
2175 | msg.u.create_trace_chunk.session_id, | |
2176 | msg.u.create_trace_chunk.chunk_id, | |
e5add6d0 JG |
2177 | (time_t) msg.u.create_trace_chunk |
2178 | .creation_timestamp, | |
d2956687 | 2179 | chunk_override_name, |
e5add6d0 JG |
2180 | msg.u.create_trace_chunk.credentials.is_set ? |
2181 | &credentials : | |
2182 | NULL, | |
cbf53d23 JG |
2183 | chunk_directory_handle); |
2184 | lttng_directory_handle_put(chunk_directory_handle); | |
d2956687 | 2185 | goto end_msg_sessiond; |
00fb02ac | 2186 | } |
d2956687 | 2187 | case LTTNG_CONSUMER_CLOSE_TRACE_CHUNK: |
a1ae2ea5 | 2188 | { |
bbc4768c | 2189 | enum lttng_trace_chunk_command_type close_command = |
97535efa | 2190 | (lttng_trace_chunk_command_type) |
bbc4768c | 2191 | msg.u.close_trace_chunk.close_command.value; |
d2956687 JG |
2192 | const uint64_t relayd_id = |
2193 | msg.u.close_trace_chunk.relayd_id.value; | |
ecd1a12f | 2194 | struct lttcomm_consumer_close_trace_chunk_reply reply; |
d00fb490 | 2195 | char closed_trace_chunk_path[LTTNG_PATH_MAX] = {}; |
ecd1a12f | 2196 | int ret; |
d2956687 JG |
2197 | |
2198 | ret_code = lttng_consumer_close_trace_chunk( | |
2199 | msg.u.close_trace_chunk.relayd_id.is_set ? | |
bbc4768c JG |
2200 | &relayd_id : |
2201 | NULL, | |
d2956687 JG |
2202 | msg.u.close_trace_chunk.session_id, |
2203 | msg.u.close_trace_chunk.chunk_id, | |
bbc4768c JG |
2204 | (time_t) msg.u.close_trace_chunk.close_timestamp, |
2205 | msg.u.close_trace_chunk.close_command.is_set ? | |
2206 | &close_command : | |
ecd1a12f MD |
2207 | NULL, closed_trace_chunk_path); |
2208 | reply.ret_code = ret_code; | |
2209 | reply.path_length = strlen(closed_trace_chunk_path) + 1; | |
2210 | ret = lttcomm_send_unix_sock(sock, &reply, sizeof(reply)); | |
2211 | if (ret != sizeof(reply)) { | |
2212 | goto error_fatal; | |
2213 | } | |
2214 | ret = lttcomm_send_unix_sock(sock, closed_trace_chunk_path, | |
2215 | reply.path_length); | |
2216 | if (ret != reply.path_length) { | |
2217 | goto error_fatal; | |
2218 | } | |
2219 | goto end_nosignal; | |
a1ae2ea5 | 2220 | } |
d2956687 | 2221 | case LTTNG_CONSUMER_TRACE_CHUNK_EXISTS: |
3654ed19 | 2222 | { |
d2956687 JG |
2223 | const uint64_t relayd_id = |
2224 | msg.u.trace_chunk_exists.relayd_id.value; | |
2225 | ||
2226 | ret_code = lttng_consumer_trace_chunk_exists( | |
2227 | msg.u.trace_chunk_exists.relayd_id.is_set ? | |
2228 | &relayd_id : NULL, | |
2229 | msg.u.trace_chunk_exists.session_id, | |
2230 | msg.u.trace_chunk_exists.chunk_id); | |
2231 | goto end_msg_sessiond; | |
04ed9e10 JG |
2232 | } |
2233 | case LTTNG_CONSUMER_OPEN_CHANNEL_PACKETS: | |
2234 | { | |
2235 | const uint64_t key = msg.u.open_channel_packets.key; | |
594c7c00 | 2236 | struct lttng_consumer_channel *found_channel = |
04ed9e10 JG |
2237 | consumer_find_channel(key); |
2238 | ||
594c7c00 SM |
2239 | if (found_channel) { |
2240 | pthread_mutex_lock(&found_channel->lock); | |
2241 | ret_code = lttng_consumer_open_channel_packets( | |
2242 | found_channel); | |
2243 | pthread_mutex_unlock(&found_channel->lock); | |
04ed9e10 JG |
2244 | } else { |
2245 | /* | |
2246 | * The channel could have disappeared in per-pid | |
2247 | * buffering mode. | |
2248 | */ | |
2249 | DBG("Channel %" PRIu64 " not found", key); | |
2250 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
2251 | } | |
2252 | ||
2253 | health_code_update(); | |
2254 | goto end_msg_sessiond; | |
3654ed19 | 2255 | } |
3bd1e081 MD |
2256 | default: |
2257 | break; | |
2258 | } | |
3f8e211f | 2259 | |
3bd1e081 | 2260 | end_nosignal: |
4cbc1a04 DG |
2261 | /* |
2262 | * Return 1 to indicate success since the 0 value can be a socket | |
2263 | * shutdown during the recv() or send() call. | |
2264 | */ | |
594c7c00 | 2265 | ret_func = 1; |
f3a1fc7b | 2266 | goto end; |
ffe60014 DG |
2267 | |
2268 | end_msg_sessiond: | |
2269 | /* | |
2270 | * The returned value here is not useful since either way we'll return 1 to | |
2271 | * the caller because the session daemon socket management is done | |
2272 | * elsewhere. Returning a negative code or 0 will shutdown the consumer. | |
2273 | */ | |
594c7c00 SM |
2274 | { |
2275 | int ret_send_status; | |
2276 | ||
2277 | ret_send_status = consumer_send_status_msg(sock, ret_code); | |
2278 | if (ret_send_status < 0) { | |
2279 | goto error_fatal; | |
2280 | } | |
489f70e9 | 2281 | } |
594c7c00 SM |
2282 | |
2283 | ret_func = 1; | |
f3a1fc7b | 2284 | goto end; |
9ce5646a | 2285 | |
ffe60014 DG |
2286 | end_channel_error: |
2287 | if (channel) { | |
a00932c8 | 2288 | consumer_del_channel(channel); |
ffe60014 DG |
2289 | } |
2290 | /* We have to send a status channel message indicating an error. */ | |
594c7c00 SM |
2291 | { |
2292 | int ret_send_status; | |
2293 | ||
2294 | ret_send_status = consumer_send_status_channel(sock, NULL); | |
2295 | if (ret_send_status < 0) { | |
2296 | /* Stop everything if session daemon can not be notified. */ | |
2297 | goto error_fatal; | |
2298 | } | |
ffe60014 | 2299 | } |
594c7c00 SM |
2300 | |
2301 | ret_func = 1; | |
f3a1fc7b | 2302 | goto end; |
9ce5646a | 2303 | |
ffe60014 | 2304 | error_fatal: |
ffe60014 | 2305 | /* This will issue a consumer stop. */ |
594c7c00 | 2306 | ret_func = -1; |
f3a1fc7b JG |
2307 | goto end; |
2308 | ||
2309 | end: | |
2310 | rcu_read_unlock(); | |
2311 | health_code_update(); | |
594c7c00 | 2312 | return ret_func; |
3bd1e081 MD |
2313 | } |
2314 | ||
881fc67f MD |
2315 | int lttng_ust_flush_buffer(struct lttng_consumer_stream *stream, |
2316 | int producer_active) | |
fc6d7a51 | 2317 | { |
a0377dfe FD |
2318 | LTTNG_ASSERT(stream); |
2319 | LTTNG_ASSERT(stream->ustream); | |
fc6d7a51 | 2320 | |
881fc67f | 2321 | return lttng_ust_ctl_flush_buffer(stream->ustream, producer_active); |
fc6d7a51 JD |
2322 | } |
2323 | ||
ffe60014 | 2324 | /* |
e9404c27 | 2325 | * Take a snapshot for a specific stream. |
ffe60014 DG |
2326 | * |
2327 | * Returns 0 on success, < 0 on error | |
2328 | */ | |
2329 | int lttng_ustconsumer_take_snapshot(struct lttng_consumer_stream *stream) | |
3bd1e081 | 2330 | { |
a0377dfe FD |
2331 | LTTNG_ASSERT(stream); |
2332 | LTTNG_ASSERT(stream->ustream); | |
ffe60014 | 2333 | |
b623cb6a | 2334 | return lttng_ust_ctl_snapshot(stream->ustream); |
3bd1e081 MD |
2335 | } |
2336 | ||
e9404c27 JG |
2337 | /* |
2338 | * Sample consumed and produced positions for a specific stream. | |
2339 | * | |
2340 | * Returns 0 on success, < 0 on error. | |
2341 | */ | |
2342 | int lttng_ustconsumer_sample_snapshot_positions( | |
2343 | struct lttng_consumer_stream *stream) | |
2344 | { | |
a0377dfe FD |
2345 | LTTNG_ASSERT(stream); |
2346 | LTTNG_ASSERT(stream->ustream); | |
e9404c27 | 2347 | |
b623cb6a | 2348 | return lttng_ust_ctl_snapshot_sample_positions(stream->ustream); |
e9404c27 JG |
2349 | } |
2350 | ||
ffe60014 DG |
2351 | /* |
2352 | * Get the produced position | |
2353 | * | |
2354 | * Returns 0 on success, < 0 on error | |
2355 | */ | |
2356 | int lttng_ustconsumer_get_produced_snapshot( | |
2357 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
3bd1e081 | 2358 | { |
a0377dfe FD |
2359 | LTTNG_ASSERT(stream); |
2360 | LTTNG_ASSERT(stream->ustream); | |
2361 | LTTNG_ASSERT(pos); | |
7a57cf92 | 2362 | |
b623cb6a | 2363 | return lttng_ust_ctl_snapshot_get_produced(stream->ustream, pos); |
ffe60014 | 2364 | } |
7a57cf92 | 2365 | |
10a50311 JD |
2366 | /* |
2367 | * Get the consumed position | |
2368 | * | |
2369 | * Returns 0 on success, < 0 on error | |
2370 | */ | |
2371 | int lttng_ustconsumer_get_consumed_snapshot( | |
2372 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
2373 | { | |
a0377dfe FD |
2374 | LTTNG_ASSERT(stream); |
2375 | LTTNG_ASSERT(stream->ustream); | |
2376 | LTTNG_ASSERT(pos); | |
10a50311 | 2377 | |
b623cb6a | 2378 | return lttng_ust_ctl_snapshot_get_consumed(stream->ustream, pos); |
10a50311 JD |
2379 | } |
2380 | ||
881fc67f | 2381 | int lttng_ustconsumer_flush_buffer(struct lttng_consumer_stream *stream, |
84a182ce DG |
2382 | int producer) |
2383 | { | |
a0377dfe FD |
2384 | LTTNG_ASSERT(stream); |
2385 | LTTNG_ASSERT(stream->ustream); | |
84a182ce | 2386 | |
881fc67f | 2387 | return lttng_ust_ctl_flush_buffer(stream->ustream, producer); |
84a182ce DG |
2388 | } |
2389 | ||
881fc67f | 2390 | int lttng_ustconsumer_clear_buffer(struct lttng_consumer_stream *stream) |
214f70e0 | 2391 | { |
a0377dfe FD |
2392 | LTTNG_ASSERT(stream); |
2393 | LTTNG_ASSERT(stream->ustream); | |
214f70e0 | 2394 | |
881fc67f | 2395 | return lttng_ust_ctl_clear_buffer(stream->ustream); |
214f70e0 JR |
2396 | } |
2397 | ||
84a182ce DG |
2398 | int lttng_ustconsumer_get_current_timestamp( |
2399 | struct lttng_consumer_stream *stream, uint64_t *ts) | |
2400 | { | |
a0377dfe FD |
2401 | LTTNG_ASSERT(stream); |
2402 | LTTNG_ASSERT(stream->ustream); | |
2403 | LTTNG_ASSERT(ts); | |
84a182ce | 2404 | |
b623cb6a | 2405 | return lttng_ust_ctl_get_current_timestamp(stream->ustream, ts); |
84a182ce DG |
2406 | } |
2407 | ||
fb83fe64 JD |
2408 | int lttng_ustconsumer_get_sequence_number( |
2409 | struct lttng_consumer_stream *stream, uint64_t *seq) | |
2410 | { | |
a0377dfe FD |
2411 | LTTNG_ASSERT(stream); |
2412 | LTTNG_ASSERT(stream->ustream); | |
2413 | LTTNG_ASSERT(seq); | |
fb83fe64 | 2414 | |
b623cb6a | 2415 | return lttng_ust_ctl_get_sequence_number(stream->ustream, seq); |
fb83fe64 JD |
2416 | } |
2417 | ||
ffe60014 | 2418 | /* |
0dd01979 | 2419 | * Called when the stream signals the consumer that it has hung up. |
ffe60014 DG |
2420 | */ |
2421 | void lttng_ustconsumer_on_stream_hangup(struct lttng_consumer_stream *stream) | |
2422 | { | |
a0377dfe FD |
2423 | LTTNG_ASSERT(stream); |
2424 | LTTNG_ASSERT(stream->ustream); | |
2c1dd183 | 2425 | |
0dd01979 MD |
2426 | pthread_mutex_lock(&stream->lock); |
2427 | if (!stream->quiescent) { | |
881fc67f MD |
2428 | if (lttng_ust_ctl_flush_buffer(stream->ustream, 0) < 0) { |
2429 | ERR("Failed to flush buffer on stream hang-up"); | |
2430 | } else { | |
2431 | stream->quiescent = true; | |
2432 | } | |
0dd01979 | 2433 | } |
d9ab8c66 | 2434 | |
ffe60014 | 2435 | stream->hangup_flush_done = 1; |
d9ab8c66 | 2436 | pthread_mutex_unlock(&stream->lock); |
ffe60014 | 2437 | } |
ee77a7b0 | 2438 | |
ffe60014 DG |
2439 | void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan) |
2440 | { | |
4628484a MD |
2441 | int i; |
2442 | ||
a0377dfe FD |
2443 | LTTNG_ASSERT(chan); |
2444 | LTTNG_ASSERT(chan->uchan); | |
2445 | LTTNG_ASSERT(chan->buffer_credentials.is_set); | |
e316aad5 | 2446 | |
ea88ca2a MD |
2447 | if (chan->switch_timer_enabled == 1) { |
2448 | consumer_timer_switch_stop(chan); | |
2449 | } | |
4628484a MD |
2450 | for (i = 0; i < chan->nr_stream_fds; i++) { |
2451 | int ret; | |
2452 | ||
2453 | ret = close(chan->stream_fds[i]); | |
2454 | if (ret) { | |
2455 | PERROR("close"); | |
2456 | } | |
2457 | if (chan->shm_path[0]) { | |
2458 | char shm_path[PATH_MAX]; | |
2459 | ||
2460 | ret = get_stream_shm_path(shm_path, chan->shm_path, i); | |
2461 | if (ret) { | |
2462 | ERR("Cannot get stream shm path"); | |
2463 | } | |
d2956687 | 2464 | ret = run_as_unlink(shm_path, |
ff588497 JR |
2465 | lttng_credentials_get_uid(LTTNG_OPTIONAL_GET_PTR( |
2466 | chan->buffer_credentials)), | |
2467 | lttng_credentials_get_gid(LTTNG_OPTIONAL_GET_PTR( | |
2468 | chan->buffer_credentials))); | |
4628484a | 2469 | if (ret) { |
4628484a MD |
2470 | PERROR("unlink %s", shm_path); |
2471 | } | |
2472 | } | |
2473 | } | |
3bd1e081 MD |
2474 | } |
2475 | ||
b83e03c4 MD |
2476 | void lttng_ustconsumer_free_channel(struct lttng_consumer_channel *chan) |
2477 | { | |
a0377dfe FD |
2478 | LTTNG_ASSERT(chan); |
2479 | LTTNG_ASSERT(chan->uchan); | |
2480 | LTTNG_ASSERT(chan->buffer_credentials.is_set); | |
b83e03c4 MD |
2481 | |
2482 | consumer_metadata_cache_destroy(chan); | |
b623cb6a | 2483 | lttng_ust_ctl_destroy_channel(chan->uchan); |
ea853771 JR |
2484 | /* Try to rmdir all directories under shm_path root. */ |
2485 | if (chan->root_shm_path[0]) { | |
602766ec | 2486 | (void) run_as_rmdir_recursive(chan->root_shm_path, |
ff588497 JR |
2487 | lttng_credentials_get_uid(LTTNG_OPTIONAL_GET_PTR( |
2488 | chan->buffer_credentials)), | |
2489 | lttng_credentials_get_gid(LTTNG_OPTIONAL_GET_PTR( | |
2490 | chan->buffer_credentials)), | |
f75c5439 | 2491 | LTTNG_DIRECTORY_HANDLE_SKIP_NON_EMPTY_FLAG); |
ea853771 | 2492 | } |
b83e03c4 MD |
2493 | free(chan->stream_fds); |
2494 | } | |
2495 | ||
3bd1e081 MD |
2496 | void lttng_ustconsumer_del_stream(struct lttng_consumer_stream *stream) |
2497 | { | |
a0377dfe FD |
2498 | LTTNG_ASSERT(stream); |
2499 | LTTNG_ASSERT(stream->ustream); | |
d41f73b7 | 2500 | |
ea88ca2a MD |
2501 | if (stream->chan->switch_timer_enabled == 1) { |
2502 | consumer_timer_switch_stop(stream->chan); | |
2503 | } | |
b623cb6a | 2504 | lttng_ust_ctl_destroy_stream(stream->ustream); |
ffe60014 | 2505 | } |
d41f73b7 | 2506 | |
6d574024 DG |
2507 | int lttng_ustconsumer_get_wakeup_fd(struct lttng_consumer_stream *stream) |
2508 | { | |
a0377dfe FD |
2509 | LTTNG_ASSERT(stream); |
2510 | LTTNG_ASSERT(stream->ustream); | |
6d574024 | 2511 | |
b623cb6a | 2512 | return lttng_ust_ctl_stream_get_wakeup_fd(stream->ustream); |
6d574024 DG |
2513 | } |
2514 | ||
2515 | int lttng_ustconsumer_close_wakeup_fd(struct lttng_consumer_stream *stream) | |
2516 | { | |
a0377dfe FD |
2517 | LTTNG_ASSERT(stream); |
2518 | LTTNG_ASSERT(stream->ustream); | |
6d574024 | 2519 | |
b623cb6a | 2520 | return lttng_ust_ctl_stream_close_wakeup_fd(stream->ustream); |
6d574024 DG |
2521 | } |
2522 | ||
94d49140 JD |
2523 | /* |
2524 | * Write up to one packet from the metadata cache to the channel. | |
2525 | * | |
577eea73 JG |
2526 | * Returns the number of bytes pushed from the cache into the ring buffer, or a |
2527 | * negative value on error. | |
94d49140 JD |
2528 | */ |
2529 | static | |
2530 | int commit_one_metadata_packet(struct lttng_consumer_stream *stream) | |
2531 | { | |
2532 | ssize_t write_len; | |
2533 | int ret; | |
2534 | ||
2535 | pthread_mutex_lock(&stream->chan->metadata_cache->lock); | |
9eac9828 JG |
2536 | if (stream->chan->metadata_cache->contents.size == |
2537 | stream->ust_metadata_pushed) { | |
55954e07 JG |
2538 | /* |
2539 | * In the context of a user space metadata channel, a | |
2540 | * change in version can be detected in two ways: | |
2541 | * 1) During the pre-consume of the `read_subbuffer` loop, | |
2542 | * 2) When populating the metadata ring buffer (i.e. here). | |
2543 | * | |
2544 | * This function is invoked when there is no metadata | |
2545 | * available in the ring-buffer. If all data was consumed | |
2546 | * up to the size of the metadata cache, there is no metadata | |
2547 | * to insert in the ring-buffer. | |
2548 | * | |
2549 | * However, the metadata version could still have changed (a | |
2550 | * regeneration without any new data will yield the same cache | |
2551 | * size). | |
2552 | * | |
2553 | * The cache's version is checked for a version change and the | |
2554 | * consumed position is reset if one occurred. | |
2555 | * | |
2556 | * This check is only necessary for the user space domain as | |
2557 | * it has to manage the cache explicitly. If this reset was not | |
2558 | * performed, no metadata would be consumed (and no reset would | |
2559 | * occur as part of the pre-consume) until the metadata size | |
2560 | * exceeded the cache size. | |
2561 | */ | |
2562 | if (stream->metadata_version != | |
2563 | stream->chan->metadata_cache->version) { | |
2564 | metadata_stream_reset_cache_consumed_position(stream); | |
2565 | consumer_stream_metadata_set_version(stream, | |
2566 | stream->chan->metadata_cache->version); | |
2567 | } else { | |
2568 | ret = 0; | |
2569 | goto end; | |
2570 | } | |
94d49140 JD |
2571 | } |
2572 | ||
b623cb6a | 2573 | write_len = lttng_ust_ctl_write_one_packet_to_channel(stream->chan->uchan, |
9eac9828 JG |
2574 | &stream->chan->metadata_cache->contents.data[stream->ust_metadata_pushed], |
2575 | stream->chan->metadata_cache->contents.size - | |
2576 | stream->ust_metadata_pushed); | |
a0377dfe | 2577 | LTTNG_ASSERT(write_len != 0); |
94d49140 JD |
2578 | if (write_len < 0) { |
2579 | ERR("Writing one metadata packet"); | |
f5ba75b4 | 2580 | ret = write_len; |
94d49140 JD |
2581 | goto end; |
2582 | } | |
2583 | stream->ust_metadata_pushed += write_len; | |
2584 | ||
a0377dfe | 2585 | LTTNG_ASSERT(stream->chan->metadata_cache->contents.size >= |
94d49140 JD |
2586 | stream->ust_metadata_pushed); |
2587 | ret = write_len; | |
2588 | ||
0d88e046 JG |
2589 | /* |
2590 | * Switch packet (but don't open the next one) on every commit of | |
2591 | * a metadata packet. Since the subbuffer is fully filled (with padding, | |
2592 | * if needed), the stream is "quiescent" after this commit. | |
2593 | */ | |
881fc67f | 2594 | if (lttng_ust_ctl_flush_buffer(stream->ustream, 1)) { |
edb555b5 | 2595 | ERR("Failed to flush buffer while committing one metadata packet"); |
881fc67f MD |
2596 | ret = -EIO; |
2597 | } else { | |
2598 | stream->quiescent = true; | |
2599 | } | |
94d49140 JD |
2600 | end: |
2601 | pthread_mutex_unlock(&stream->chan->metadata_cache->lock); | |
2602 | return ret; | |
2603 | } | |
2604 | ||
309167d2 | 2605 | |
94d49140 JD |
2606 | /* |
2607 | * Sync metadata meaning request them to the session daemon and snapshot to the | |
2608 | * metadata thread can consumer them. | |
2609 | * | |
c585821b MD |
2610 | * Metadata stream lock is held here, but we need to release it when |
2611 | * interacting with sessiond, else we cause a deadlock with live | |
2612 | * awaiting on metadata to be pushed out. | |
94d49140 | 2613 | * |
cdb72e4e | 2614 | * The RCU read side lock must be held by the caller. |
94d49140 | 2615 | */ |
577eea73 JG |
2616 | enum sync_metadata_status lttng_ustconsumer_sync_metadata( |
2617 | struct lttng_consumer_local_data *ctx, | |
cdb72e4e | 2618 | struct lttng_consumer_stream *metadata_stream) |
94d49140 JD |
2619 | { |
2620 | int ret; | |
577eea73 | 2621 | enum sync_metadata_status status; |
cdb72e4e | 2622 | struct lttng_consumer_channel *metadata_channel; |
94d49140 | 2623 | |
a0377dfe FD |
2624 | LTTNG_ASSERT(ctx); |
2625 | LTTNG_ASSERT(metadata_stream); | |
48b7cdc2 | 2626 | ASSERT_RCU_READ_LOCKED(); |
94d49140 | 2627 | |
cdb72e4e JG |
2628 | metadata_channel = metadata_stream->chan; |
2629 | pthread_mutex_unlock(&metadata_stream->lock); | |
94d49140 JD |
2630 | /* |
2631 | * Request metadata from the sessiond, but don't wait for the flush | |
2632 | * because we locked the metadata thread. | |
2633 | */ | |
cdb72e4e JG |
2634 | ret = lttng_ustconsumer_request_metadata(ctx, metadata_channel, 0, 0); |
2635 | pthread_mutex_lock(&metadata_stream->lock); | |
94d49140 | 2636 | if (ret < 0) { |
577eea73 | 2637 | status = SYNC_METADATA_STATUS_ERROR; |
94d49140 JD |
2638 | goto end; |
2639 | } | |
2640 | ||
cdb72e4e JG |
2641 | /* |
2642 | * The metadata stream and channel can be deleted while the | |
2643 | * metadata stream lock was released. The streamed is checked | |
2644 | * for deletion before we use it further. | |
2645 | * | |
2646 | * Note that it is safe to access a logically-deleted stream since its | |
2647 | * existence is still guaranteed by the RCU read side lock. However, | |
2648 | * it should no longer be used. The close/deletion of the metadata | |
2649 | * channel and stream already guarantees that all metadata has been | |
2650 | * consumed. Therefore, there is nothing left to do in this function. | |
2651 | */ | |
2652 | if (consumer_stream_is_deleted(metadata_stream)) { | |
2653 | DBG("Metadata stream %" PRIu64 " was deleted during the metadata synchronization", | |
2654 | metadata_stream->key); | |
577eea73 | 2655 | status = SYNC_METADATA_STATUS_NO_DATA; |
cdb72e4e JG |
2656 | goto end; |
2657 | } | |
2658 | ||
2659 | ret = commit_one_metadata_packet(metadata_stream); | |
577eea73 JG |
2660 | if (ret < 0) { |
2661 | status = SYNC_METADATA_STATUS_ERROR; | |
94d49140 JD |
2662 | goto end; |
2663 | } else if (ret > 0) { | |
577eea73 JG |
2664 | status = SYNC_METADATA_STATUS_NEW_DATA; |
2665 | } else /* ret == 0 */ { | |
2666 | status = SYNC_METADATA_STATUS_NO_DATA; | |
2667 | goto end; | |
94d49140 JD |
2668 | } |
2669 | ||
b623cb6a | 2670 | ret = lttng_ust_ctl_snapshot(metadata_stream->ustream); |
94d49140 | 2671 | if (ret < 0) { |
577eea73 JG |
2672 | ERR("Failed to take a snapshot of the metadata ring-buffer positions, ret = %d", ret); |
2673 | status = SYNC_METADATA_STATUS_ERROR; | |
94d49140 JD |
2674 | goto end; |
2675 | } | |
2676 | ||
94d49140 | 2677 | end: |
577eea73 | 2678 | return status; |
94d49140 JD |
2679 | } |
2680 | ||
02b3d176 DG |
2681 | /* |
2682 | * Return 0 on success else a negative value. | |
2683 | */ | |
2684 | static int notify_if_more_data(struct lttng_consumer_stream *stream, | |
2685 | struct lttng_consumer_local_data *ctx) | |
2686 | { | |
2687 | int ret; | |
b623cb6a | 2688 | struct lttng_ust_ctl_consumer_stream *ustream; |
02b3d176 | 2689 | |
a0377dfe FD |
2690 | LTTNG_ASSERT(stream); |
2691 | LTTNG_ASSERT(ctx); | |
02b3d176 DG |
2692 | |
2693 | ustream = stream->ustream; | |
2694 | ||
2695 | /* | |
2696 | * First, we are going to check if there is a new subbuffer available | |
2697 | * before reading the stream wait_fd. | |
2698 | */ | |
2699 | /* Get the next subbuffer */ | |
b623cb6a | 2700 | ret = lttng_ust_ctl_get_next_subbuf(ustream); |
02b3d176 DG |
2701 | if (ret) { |
2702 | /* No more data found, flag the stream. */ | |
2703 | stream->has_data = 0; | |
2704 | ret = 0; | |
2705 | goto end; | |
2706 | } | |
2707 | ||
b623cb6a | 2708 | ret = lttng_ust_ctl_put_subbuf(ustream); |
a0377dfe | 2709 | LTTNG_ASSERT(!ret); |
02b3d176 DG |
2710 | |
2711 | /* This stream still has data. Flag it and wake up the data thread. */ | |
2712 | stream->has_data = 1; | |
2713 | ||
2714 | if (stream->monitor && !stream->hangup_flush_done && !ctx->has_wakeup) { | |
2715 | ssize_t writelen; | |
2716 | ||
2717 | writelen = lttng_pipe_write(ctx->consumer_wakeup_pipe, "!", 1); | |
2718 | if (writelen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) { | |
2719 | ret = writelen; | |
2720 | goto end; | |
2721 | } | |
2722 | ||
2723 | /* The wake up pipe has been notified. */ | |
2724 | ctx->has_wakeup = 1; | |
2725 | } | |
2726 | ret = 0; | |
2727 | ||
2728 | end: | |
2729 | return ret; | |
2730 | } | |
2731 | ||
6f9449c2 | 2732 | static int consumer_stream_ust_on_wake_up(struct lttng_consumer_stream *stream) |
fb83fe64 | 2733 | { |
6f9449c2 | 2734 | int ret = 0; |
fb83fe64 | 2735 | |
fb83fe64 | 2736 | /* |
6f9449c2 JG |
2737 | * We can consume the 1 byte written into the wait_fd by |
2738 | * UST. Don't trigger error if we cannot read this one byte | |
2739 | * (read returns 0), or if the error is EAGAIN or EWOULDBLOCK. | |
2740 | * | |
2741 | * This is only done when the stream is monitored by a thread, | |
2742 | * before the flush is done after a hangup and if the stream | |
2743 | * is not flagged with data since there might be nothing to | |
2744 | * consume in the wait fd but still have data available | |
2745 | * flagged by the consumer wake up pipe. | |
fb83fe64 | 2746 | */ |
6f9449c2 JG |
2747 | if (stream->monitor && !stream->hangup_flush_done && !stream->has_data) { |
2748 | char dummy; | |
2749 | ssize_t readlen; | |
2750 | ||
2751 | readlen = lttng_read(stream->wait_fd, &dummy, 1); | |
2752 | if (readlen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) { | |
2753 | ret = readlen; | |
2754 | } | |
fb83fe64 | 2755 | } |
fb83fe64 | 2756 | |
6f9449c2 JG |
2757 | return ret; |
2758 | } | |
2759 | ||
2760 | static int extract_common_subbuffer_info(struct lttng_consumer_stream *stream, | |
2761 | struct stream_subbuffer *subbuf) | |
2762 | { | |
2763 | int ret; | |
2764 | ||
b623cb6a | 2765 | ret = lttng_ust_ctl_get_subbuf_size( |
6f9449c2 JG |
2766 | stream->ustream, &subbuf->info.data.subbuf_size); |
2767 | if (ret) { | |
fb83fe64 JD |
2768 | goto end; |
2769 | } | |
6f9449c2 | 2770 | |
b623cb6a | 2771 | ret = lttng_ust_ctl_get_padded_subbuf_size( |
6f9449c2 JG |
2772 | stream->ustream, &subbuf->info.data.padded_subbuf_size); |
2773 | if (ret) { | |
2774 | goto end; | |
fb83fe64 | 2775 | } |
fb83fe64 JD |
2776 | |
2777 | end: | |
2778 | return ret; | |
2779 | } | |
2780 | ||
6f9449c2 JG |
2781 | static int extract_metadata_subbuffer_info(struct lttng_consumer_stream *stream, |
2782 | struct stream_subbuffer *subbuf) | |
d41f73b7 | 2783 | { |
6f9449c2 | 2784 | int ret; |
ffe60014 | 2785 | |
6f9449c2 JG |
2786 | ret = extract_common_subbuffer_info(stream, subbuf); |
2787 | if (ret) { | |
2788 | goto end; | |
2789 | } | |
d41f73b7 | 2790 | |
55954e07 | 2791 | subbuf->info.metadata.version = stream->metadata_version; |
ffe60014 | 2792 | |
6f9449c2 JG |
2793 | end: |
2794 | return ret; | |
2795 | } | |
d41f73b7 | 2796 | |
6f9449c2 JG |
2797 | static int extract_data_subbuffer_info(struct lttng_consumer_stream *stream, |
2798 | struct stream_subbuffer *subbuf) | |
2799 | { | |
2800 | int ret; | |
c617c0c6 | 2801 | |
6f9449c2 JG |
2802 | ret = extract_common_subbuffer_info(stream, subbuf); |
2803 | if (ret) { | |
2804 | goto end; | |
02d02e31 JD |
2805 | } |
2806 | ||
b623cb6a | 2807 | ret = lttng_ust_ctl_get_packet_size( |
6f9449c2 JG |
2808 | stream->ustream, &subbuf->info.data.packet_size); |
2809 | if (ret < 0) { | |
2810 | PERROR("Failed to get sub-buffer packet size"); | |
2811 | goto end; | |
2812 | } | |
04ef1097 | 2813 | |
b623cb6a | 2814 | ret = lttng_ust_ctl_get_content_size( |
6f9449c2 JG |
2815 | stream->ustream, &subbuf->info.data.content_size); |
2816 | if (ret < 0) { | |
2817 | PERROR("Failed to get sub-buffer content size"); | |
2818 | goto end; | |
d41f73b7 | 2819 | } |
309167d2 | 2820 | |
b623cb6a | 2821 | ret = lttng_ust_ctl_get_timestamp_begin( |
6f9449c2 JG |
2822 | stream->ustream, &subbuf->info.data.timestamp_begin); |
2823 | if (ret < 0) { | |
2824 | PERROR("Failed to get sub-buffer begin timestamp"); | |
2825 | goto end; | |
2826 | } | |
fb83fe64 | 2827 | |
b623cb6a | 2828 | ret = lttng_ust_ctl_get_timestamp_end( |
6f9449c2 JG |
2829 | stream->ustream, &subbuf->info.data.timestamp_end); |
2830 | if (ret < 0) { | |
2831 | PERROR("Failed to get sub-buffer end timestamp"); | |
2832 | goto end; | |
2833 | } | |
2834 | ||
b623cb6a | 2835 | ret = lttng_ust_ctl_get_events_discarded( |
6f9449c2 JG |
2836 | stream->ustream, &subbuf->info.data.events_discarded); |
2837 | if (ret) { | |
2838 | PERROR("Failed to get sub-buffer events discarded count"); | |
2839 | goto end; | |
2840 | } | |
2841 | ||
b623cb6a | 2842 | ret = lttng_ust_ctl_get_sequence_number(stream->ustream, |
6f9449c2 JG |
2843 | &subbuf->info.data.sequence_number.value); |
2844 | if (ret) { | |
2845 | /* May not be supported by older LTTng-modules. */ | |
2846 | if (ret != -ENOTTY) { | |
2847 | PERROR("Failed to get sub-buffer sequence number"); | |
2848 | goto end; | |
fb83fe64 | 2849 | } |
1c20f0e2 | 2850 | } else { |
6f9449c2 | 2851 | subbuf->info.data.sequence_number.is_set = true; |
309167d2 JD |
2852 | } |
2853 | ||
b623cb6a | 2854 | ret = lttng_ust_ctl_get_stream_id( |
6f9449c2 JG |
2855 | stream->ustream, &subbuf->info.data.stream_id); |
2856 | if (ret < 0) { | |
2857 | PERROR("Failed to get stream id"); | |
2858 | goto end; | |
2859 | } | |
1d4dfdef | 2860 | |
b623cb6a | 2861 | ret = lttng_ust_ctl_get_instance_id(stream->ustream, |
6f9449c2 JG |
2862 | &subbuf->info.data.stream_instance_id.value); |
2863 | if (ret) { | |
2864 | /* May not be supported by older LTTng-modules. */ | |
2865 | if (ret != -ENOTTY) { | |
2866 | PERROR("Failed to get stream instance id"); | |
2867 | goto end; | |
2868 | } | |
2869 | } else { | |
2870 | subbuf->info.data.stream_instance_id.is_set = true; | |
2871 | } | |
2872 | end: | |
2873 | return ret; | |
2874 | } | |
1d4dfdef | 2875 | |
6f9449c2 JG |
2876 | static int get_next_subbuffer_common(struct lttng_consumer_stream *stream, |
2877 | struct stream_subbuffer *subbuffer) | |
2878 | { | |
2879 | int ret; | |
2880 | const char *addr; | |
1d4dfdef | 2881 | |
6f9449c2 JG |
2882 | ret = stream->read_subbuffer_ops.extract_subbuffer_info( |
2883 | stream, subbuffer); | |
2884 | if (ret) { | |
2885 | goto end; | |
2886 | } | |
02d02e31 | 2887 | |
6f9449c2 | 2888 | ret = get_current_subbuf_addr(stream, &addr); |
128708c3 | 2889 | if (ret) { |
6f9449c2 | 2890 | goto end; |
128708c3 JG |
2891 | } |
2892 | ||
6f9449c2 JG |
2893 | subbuffer->buffer.buffer = lttng_buffer_view_init( |
2894 | addr, 0, subbuffer->info.data.padded_subbuf_size); | |
a0377dfe | 2895 | LTTNG_ASSERT(subbuffer->buffer.buffer.data != NULL); |
6f9449c2 JG |
2896 | end: |
2897 | return ret; | |
2898 | } | |
fd424d99 | 2899 | |
b6797c8e JG |
2900 | static enum get_next_subbuffer_status get_next_subbuffer( |
2901 | struct lttng_consumer_stream *stream, | |
6f9449c2 JG |
2902 | struct stream_subbuffer *subbuffer) |
2903 | { | |
2904 | int ret; | |
b6797c8e | 2905 | enum get_next_subbuffer_status status; |
331744e3 | 2906 | |
b623cb6a | 2907 | ret = lttng_ust_ctl_get_next_subbuf(stream->ustream); |
b6797c8e JG |
2908 | switch (ret) { |
2909 | case 0: | |
2910 | status = GET_NEXT_SUBBUFFER_STATUS_OK; | |
2911 | break; | |
2912 | case -ENODATA: | |
2913 | case -EAGAIN: | |
2914 | /* | |
2915 | * The caller only expects -ENODATA when there is no data to | |
2916 | * read, but the kernel tracer returns -EAGAIN when there is | |
2917 | * currently no data for a non-finalized stream, and -ENODATA | |
2918 | * when there is no data for a finalized stream. Those can be | |
2919 | * combined into a -ENODATA return value. | |
2920 | */ | |
2921 | status = GET_NEXT_SUBBUFFER_STATUS_NO_DATA; | |
2922 | goto end; | |
2923 | default: | |
2924 | status = GET_NEXT_SUBBUFFER_STATUS_ERROR; | |
6f9449c2 | 2925 | goto end; |
02b3d176 DG |
2926 | } |
2927 | ||
6f9449c2 JG |
2928 | ret = get_next_subbuffer_common(stream, subbuffer); |
2929 | if (ret) { | |
b6797c8e | 2930 | status = GET_NEXT_SUBBUFFER_STATUS_ERROR; |
23d56598 | 2931 | goto end; |
1c20f0e2 | 2932 | } |
6f9449c2 | 2933 | end: |
b6797c8e | 2934 | return status; |
6f9449c2 | 2935 | } |
1c20f0e2 | 2936 | |
b6797c8e JG |
2937 | static enum get_next_subbuffer_status get_next_subbuffer_metadata( |
2938 | struct lttng_consumer_stream *stream, | |
6f9449c2 JG |
2939 | struct stream_subbuffer *subbuffer) |
2940 | { | |
2941 | int ret; | |
f5ba75b4 JG |
2942 | bool cache_empty; |
2943 | bool got_subbuffer; | |
2944 | bool coherent; | |
2945 | bool buffer_empty; | |
2946 | unsigned long consumed_pos, produced_pos; | |
b6797c8e | 2947 | enum get_next_subbuffer_status status; |
6f9449c2 | 2948 | |
f5ba75b4 | 2949 | do { |
b623cb6a | 2950 | ret = lttng_ust_ctl_get_next_subbuf(stream->ustream); |
f5ba75b4 JG |
2951 | if (ret == 0) { |
2952 | got_subbuffer = true; | |
2953 | } else { | |
2954 | got_subbuffer = false; | |
2955 | if (ret != -EAGAIN) { | |
2956 | /* Fatal error. */ | |
b6797c8e | 2957 | status = GET_NEXT_SUBBUFFER_STATUS_ERROR; |
f5ba75b4 JG |
2958 | goto end; |
2959 | } | |
c585821b MD |
2960 | } |
2961 | ||
f5ba75b4 JG |
2962 | /* |
2963 | * Determine if the cache is empty and ensure that a sub-buffer | |
2964 | * is made available if the cache is not empty. | |
2965 | */ | |
2966 | if (!got_subbuffer) { | |
2967 | ret = commit_one_metadata_packet(stream); | |
2968 | if (ret < 0 && ret != -ENOBUFS) { | |
b6797c8e | 2969 | status = GET_NEXT_SUBBUFFER_STATUS_ERROR; |
f5ba75b4 JG |
2970 | goto end; |
2971 | } else if (ret == 0) { | |
2972 | /* Not an error, the cache is empty. */ | |
2973 | cache_empty = true; | |
b6797c8e | 2974 | status = GET_NEXT_SUBBUFFER_STATUS_NO_DATA; |
f5ba75b4 JG |
2975 | goto end; |
2976 | } else { | |
2977 | cache_empty = false; | |
2978 | } | |
2979 | } else { | |
2980 | pthread_mutex_lock(&stream->chan->metadata_cache->lock); | |
9eac9828 JG |
2981 | cache_empty = stream->chan->metadata_cache->contents.size == |
2982 | stream->ust_metadata_pushed; | |
f5ba75b4 | 2983 | pthread_mutex_unlock(&stream->chan->metadata_cache->lock); |
94d49140 | 2984 | } |
f5ba75b4 | 2985 | } while (!got_subbuffer); |
94d49140 | 2986 | |
f5ba75b4 | 2987 | /* Populate sub-buffer infos and view. */ |
6f9449c2 JG |
2988 | ret = get_next_subbuffer_common(stream, subbuffer); |
2989 | if (ret) { | |
b6797c8e | 2990 | status = GET_NEXT_SUBBUFFER_STATUS_ERROR; |
6f9449c2 | 2991 | goto end; |
309167d2 | 2992 | } |
f5ba75b4 JG |
2993 | |
2994 | ret = lttng_ustconsumer_sample_snapshot_positions(stream); | |
2995 | if (ret < 0) { | |
2996 | /* | |
2997 | * -EAGAIN is not expected since we got a sub-buffer and haven't | |
2998 | * pushed the consumption position yet (on put_next). | |
2999 | */ | |
3000 | PERROR("Failed to take a snapshot of metadata buffer positions"); | |
b6797c8e | 3001 | status = GET_NEXT_SUBBUFFER_STATUS_ERROR; |
f5ba75b4 JG |
3002 | goto end; |
3003 | } | |
3004 | ||
3005 | ret = lttng_ustconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
3006 | if (ret) { | |
3007 | PERROR("Failed to get metadata consumed position"); | |
b6797c8e | 3008 | status = GET_NEXT_SUBBUFFER_STATUS_ERROR; |
f5ba75b4 JG |
3009 | goto end; |
3010 | } | |
3011 | ||
3012 | ret = lttng_ustconsumer_get_produced_snapshot(stream, &produced_pos); | |
3013 | if (ret) { | |
3014 | PERROR("Failed to get metadata produced position"); | |
b6797c8e | 3015 | status = GET_NEXT_SUBBUFFER_STATUS_ERROR; |
f5ba75b4 JG |
3016 | goto end; |
3017 | } | |
3018 | ||
3019 | /* Last sub-buffer of the ring buffer ? */ | |
3020 | buffer_empty = (consumed_pos + stream->max_sb_size) == produced_pos; | |
3021 | ||
3022 | /* | |
3023 | * The sessiond registry lock ensures that coherent units of metadata | |
3024 | * are pushed to the consumer daemon at once. Hence, if a sub-buffer is | |
3025 | * acquired, the cache is empty, and it is the only available sub-buffer | |
3026 | * available, it is safe to assume that it is "coherent". | |
3027 | */ | |
3028 | coherent = got_subbuffer && cache_empty && buffer_empty; | |
3029 | ||
3030 | LTTNG_OPTIONAL_SET(&subbuffer->info.metadata.coherent, coherent); | |
b6797c8e | 3031 | status = GET_NEXT_SUBBUFFER_STATUS_OK; |
23d56598 | 3032 | end: |
b6797c8e | 3033 | return status; |
d41f73b7 MD |
3034 | } |
3035 | ||
6f9449c2 | 3036 | static int put_next_subbuffer(struct lttng_consumer_stream *stream, |
f46376a1 | 3037 | struct stream_subbuffer *subbuffer __attribute__((unused))) |
6f9449c2 | 3038 | { |
b623cb6a | 3039 | const int ret = lttng_ust_ctl_put_next_subbuf(stream->ustream); |
6f9449c2 | 3040 | |
a0377dfe | 3041 | LTTNG_ASSERT(ret == 0); |
6f9449c2 JG |
3042 | return ret; |
3043 | } | |
3044 | ||
3045 | static int signal_metadata(struct lttng_consumer_stream *stream, | |
f46376a1 | 3046 | struct lttng_consumer_local_data *ctx __attribute__((unused))) |
6f9449c2 | 3047 | { |
8db3acaf | 3048 | ASSERT_LOCKED(stream->metadata_rdv_lock); |
6f9449c2 JG |
3049 | return pthread_cond_broadcast(&stream->metadata_rdv) ? -errno : 0; |
3050 | } | |
3051 | ||
f5ba75b4 | 3052 | static int lttng_ustconsumer_set_stream_ops( |
6f9449c2 JG |
3053 | struct lttng_consumer_stream *stream) |
3054 | { | |
f5ba75b4 JG |
3055 | int ret = 0; |
3056 | ||
6f9449c2 JG |
3057 | stream->read_subbuffer_ops.on_wake_up = consumer_stream_ust_on_wake_up; |
3058 | if (stream->metadata_flag) { | |
3059 | stream->read_subbuffer_ops.get_next_subbuffer = | |
3060 | get_next_subbuffer_metadata; | |
3061 | stream->read_subbuffer_ops.extract_subbuffer_info = | |
3062 | extract_metadata_subbuffer_info; | |
3063 | stream->read_subbuffer_ops.reset_metadata = | |
55954e07 | 3064 | metadata_stream_reset_cache_consumed_position; |
f5ba75b4 JG |
3065 | if (stream->chan->is_live) { |
3066 | stream->read_subbuffer_ops.on_sleep = signal_metadata; | |
3067 | ret = consumer_stream_enable_metadata_bucketization( | |
3068 | stream); | |
3069 | if (ret) { | |
3070 | goto end; | |
3071 | } | |
3072 | } | |
6f9449c2 JG |
3073 | } else { |
3074 | stream->read_subbuffer_ops.get_next_subbuffer = | |
3075 | get_next_subbuffer; | |
3076 | stream->read_subbuffer_ops.extract_subbuffer_info = | |
3077 | extract_data_subbuffer_info; | |
3078 | stream->read_subbuffer_ops.on_sleep = notify_if_more_data; | |
3079 | if (stream->chan->is_live) { | |
3080 | stream->read_subbuffer_ops.send_live_beacon = | |
3081 | consumer_flush_ust_index; | |
3082 | } | |
3083 | } | |
3084 | ||
3085 | stream->read_subbuffer_ops.put_next_subbuffer = put_next_subbuffer; | |
f5ba75b4 JG |
3086 | end: |
3087 | return ret; | |
6f9449c2 JG |
3088 | } |
3089 | ||
ffe60014 DG |
3090 | /* |
3091 | * Called when a stream is created. | |
fe4477ee JD |
3092 | * |
3093 | * Return 0 on success or else a negative value. | |
ffe60014 | 3094 | */ |
d41f73b7 MD |
3095 | int lttng_ustconsumer_on_recv_stream(struct lttng_consumer_stream *stream) |
3096 | { | |
fe4477ee JD |
3097 | int ret; |
3098 | ||
a0377dfe | 3099 | LTTNG_ASSERT(stream); |
10a50311 | 3100 | |
d2956687 JG |
3101 | /* |
3102 | * Don't create anything if this is set for streaming or if there is | |
3103 | * no current trace chunk on the parent channel. | |
3104 | */ | |
3105 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor && | |
3106 | stream->chan->trace_chunk) { | |
3107 | ret = consumer_stream_create_output_files(stream, true); | |
3108 | if (ret) { | |
fe4477ee JD |
3109 | goto error; |
3110 | } | |
fe4477ee | 3111 | } |
6f9449c2 JG |
3112 | |
3113 | lttng_ustconsumer_set_stream_ops(stream); | |
fe4477ee JD |
3114 | ret = 0; |
3115 | ||
3116 | error: | |
3117 | return ret; | |
d41f73b7 | 3118 | } |
ca22feea DG |
3119 | |
3120 | /* | |
3121 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
3122 | * stream. Consumer data lock MUST be acquired before calling this function |
3123 | * and the stream lock. | |
ca22feea | 3124 | * |
6d805429 | 3125 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
3126 | * data is available for trace viewer reading. |
3127 | */ | |
6d805429 | 3128 | int lttng_ustconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
3129 | { |
3130 | int ret; | |
3131 | ||
a0377dfe FD |
3132 | LTTNG_ASSERT(stream); |
3133 | LTTNG_ASSERT(stream->ustream); | |
b1316da1 | 3134 | ASSERT_LOCKED(stream->lock); |
ca22feea | 3135 | |
6d805429 | 3136 | DBG("UST consumer checking data pending"); |
c8f59ee5 | 3137 | |
ca6b395f MD |
3138 | if (stream->endpoint_status != CONSUMER_ENDPOINT_ACTIVE) { |
3139 | ret = 0; | |
3140 | goto end; | |
3141 | } | |
3142 | ||
04ef1097 | 3143 | if (stream->chan->type == CONSUMER_CHANNEL_TYPE_METADATA) { |
e6ee4eab DG |
3144 | uint64_t contiguous, pushed; |
3145 | ||
3146 | /* Ease our life a bit. */ | |
934ba8fd | 3147 | pthread_mutex_lock(&stream->chan->metadata_cache->lock); |
9eac9828 | 3148 | contiguous = stream->chan->metadata_cache->contents.size; |
934ba8fd | 3149 | pthread_mutex_unlock(&stream->chan->metadata_cache->lock); |
e6ee4eab DG |
3150 | pushed = stream->ust_metadata_pushed; |
3151 | ||
04ef1097 MD |
3152 | /* |
3153 | * We can simply check whether all contiguously available data | |
3154 | * has been pushed to the ring buffer, since the push operation | |
3155 | * is performed within get_next_subbuf(), and because both | |
3156 | * get_next_subbuf() and put_next_subbuf() are issued atomically | |
3157 | * thanks to the stream lock within | |
3158 | * lttng_ustconsumer_read_subbuffer(). This basically means that | |
3159 | * whetnever ust_metadata_pushed is incremented, the associated | |
3160 | * metadata has been consumed from the metadata stream. | |
3161 | */ | |
3162 | DBG("UST consumer metadata pending check: contiguous %" PRIu64 " vs pushed %" PRIu64, | |
e6ee4eab | 3163 | contiguous, pushed); |
a0377dfe | 3164 | LTTNG_ASSERT(((int64_t) (contiguous - pushed)) >= 0); |
e6ee4eab | 3165 | if ((contiguous != pushed) || |
6acdf328 | 3166 | (((int64_t) contiguous - pushed) > 0 || contiguous == 0)) { |
04ef1097 MD |
3167 | ret = 1; /* Data is pending */ |
3168 | goto end; | |
3169 | } | |
3170 | } else { | |
b623cb6a | 3171 | ret = lttng_ust_ctl_get_next_subbuf(stream->ustream); |
04ef1097 MD |
3172 | if (ret == 0) { |
3173 | /* | |
3174 | * There is still data so let's put back this | |
3175 | * subbuffer. | |
3176 | */ | |
b623cb6a | 3177 | ret = lttng_ust_ctl_put_subbuf(stream->ustream); |
a0377dfe | 3178 | LTTNG_ASSERT(ret == 0); |
04ef1097 MD |
3179 | ret = 1; /* Data is pending */ |
3180 | goto end; | |
3181 | } | |
ca22feea DG |
3182 | } |
3183 | ||
6d805429 DG |
3184 | /* Data is NOT pending so ready to be read. */ |
3185 | ret = 0; | |
ca22feea | 3186 | |
6efae65e DG |
3187 | end: |
3188 | return ret; | |
ca22feea | 3189 | } |
d88aee68 | 3190 | |
6d574024 DG |
3191 | /* |
3192 | * Stop a given metadata channel timer if enabled and close the wait fd which | |
3193 | * is the poll pipe of the metadata stream. | |
3194 | * | |
d2c82a5a | 3195 | * This MUST be called with the metadata channel lock acquired. |
6d574024 DG |
3196 | */ |
3197 | void lttng_ustconsumer_close_metadata(struct lttng_consumer_channel *metadata) | |
3198 | { | |
3199 | int ret; | |
3200 | ||
a0377dfe FD |
3201 | LTTNG_ASSERT(metadata); |
3202 | LTTNG_ASSERT(metadata->type == CONSUMER_CHANNEL_TYPE_METADATA); | |
6d574024 DG |
3203 | |
3204 | DBG("Closing metadata channel key %" PRIu64, metadata->key); | |
3205 | ||
3206 | if (metadata->switch_timer_enabled == 1) { | |
3207 | consumer_timer_switch_stop(metadata); | |
3208 | } | |
3209 | ||
3210 | if (!metadata->metadata_stream) { | |
3211 | goto end; | |
3212 | } | |
3213 | ||
3214 | /* | |
3215 | * Closing write side so the thread monitoring the stream wakes up if any | |
3216 | * and clean the metadata stream. | |
3217 | */ | |
3218 | if (metadata->metadata_stream->ust_metadata_poll_pipe[1] >= 0) { | |
3219 | ret = close(metadata->metadata_stream->ust_metadata_poll_pipe[1]); | |
3220 | if (ret < 0) { | |
3221 | PERROR("closing metadata pipe write side"); | |
3222 | } | |
3223 | metadata->metadata_stream->ust_metadata_poll_pipe[1] = -1; | |
3224 | } | |
3225 | ||
3226 | end: | |
3227 | return; | |
3228 | } | |
3229 | ||
d88aee68 DG |
3230 | /* |
3231 | * Close every metadata stream wait fd of the metadata hash table. This | |
3232 | * function MUST be used very carefully so not to run into a race between the | |
3233 | * metadata thread handling streams and this function closing their wait fd. | |
3234 | * | |
3235 | * For UST, this is used when the session daemon hangs up. Its the metadata | |
3236 | * producer so calling this is safe because we are assured that no state change | |
3237 | * can occur in the metadata thread for the streams in the hash table. | |
3238 | */ | |
6d574024 | 3239 | void lttng_ustconsumer_close_all_metadata(struct lttng_ht *metadata_ht) |
d88aee68 | 3240 | { |
d88aee68 DG |
3241 | struct lttng_ht_iter iter; |
3242 | struct lttng_consumer_stream *stream; | |
3243 | ||
a0377dfe FD |
3244 | LTTNG_ASSERT(metadata_ht); |
3245 | LTTNG_ASSERT(metadata_ht->ht); | |
d88aee68 DG |
3246 | |
3247 | DBG("UST consumer closing all metadata streams"); | |
3248 | ||
3249 | rcu_read_lock(); | |
3250 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, | |
3251 | node.node) { | |
9ce5646a MD |
3252 | |
3253 | health_code_update(); | |
3254 | ||
be2b50c7 | 3255 | pthread_mutex_lock(&stream->chan->lock); |
6d574024 | 3256 | lttng_ustconsumer_close_metadata(stream->chan); |
be2b50c7 DG |
3257 | pthread_mutex_unlock(&stream->chan->lock); |
3258 | ||
d88aee68 DG |
3259 | } |
3260 | rcu_read_unlock(); | |
3261 | } | |
d8ef542d MD |
3262 | |
3263 | void lttng_ustconsumer_close_stream_wakeup(struct lttng_consumer_stream *stream) | |
3264 | { | |
3265 | int ret; | |
3266 | ||
b623cb6a | 3267 | ret = lttng_ust_ctl_stream_close_wakeup_fd(stream->ustream); |
d8ef542d MD |
3268 | if (ret < 0) { |
3269 | ERR("Unable to close wakeup fd"); | |
3270 | } | |
3271 | } | |
331744e3 | 3272 | |
f666ae70 MD |
3273 | /* |
3274 | * Please refer to consumer-timer.c before adding any lock within this | |
3275 | * function or any of its callees. Timers have a very strict locking | |
3276 | * semantic with respect to teardown. Failure to respect this semantic | |
3277 | * introduces deadlocks. | |
c585821b MD |
3278 | * |
3279 | * DON'T hold the metadata lock when calling this function, else this | |
3280 | * can cause deadlock involving consumer awaiting for metadata to be | |
3281 | * pushed out due to concurrent interaction with the session daemon. | |
f666ae70 | 3282 | */ |
331744e3 | 3283 | int lttng_ustconsumer_request_metadata(struct lttng_consumer_local_data *ctx, |
94d49140 | 3284 | struct lttng_consumer_channel *channel, int timer, int wait) |
331744e3 JD |
3285 | { |
3286 | struct lttcomm_metadata_request_msg request; | |
3287 | struct lttcomm_consumer_msg msg; | |
0c759fc9 | 3288 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
93ec662e | 3289 | uint64_t len, key, offset, version; |
331744e3 JD |
3290 | int ret; |
3291 | ||
a0377dfe FD |
3292 | LTTNG_ASSERT(channel); |
3293 | LTTNG_ASSERT(channel->metadata_cache); | |
331744e3 | 3294 | |
53efb85a MD |
3295 | memset(&request, 0, sizeof(request)); |
3296 | ||
331744e3 | 3297 | /* send the metadata request to sessiond */ |
fa29bfbf | 3298 | switch (the_consumer_data.type) { |
331744e3 JD |
3299 | case LTTNG_CONSUMER64_UST: |
3300 | request.bits_per_long = 64; | |
3301 | break; | |
3302 | case LTTNG_CONSUMER32_UST: | |
3303 | request.bits_per_long = 32; | |
3304 | break; | |
3305 | default: | |
3306 | request.bits_per_long = 0; | |
3307 | break; | |
3308 | } | |
3309 | ||
3310 | request.session_id = channel->session_id; | |
1950109e | 3311 | request.session_id_per_pid = channel->session_id_per_pid; |
567eb353 DG |
3312 | /* |
3313 | * Request the application UID here so the metadata of that application can | |
3314 | * be sent back. The channel UID corresponds to the user UID of the session | |
3315 | * used for the rights on the stream file(s). | |
3316 | */ | |
3317 | request.uid = channel->ust_app_uid; | |
331744e3 | 3318 | request.key = channel->key; |
567eb353 | 3319 | |
1950109e | 3320 | DBG("Sending metadata request to sessiond, session id %" PRIu64 |
3e25d926 | 3321 | ", per-pid %" PRIu64 ", app UID %u and channel key %" PRIu64, |
567eb353 DG |
3322 | request.session_id, request.session_id_per_pid, request.uid, |
3323 | request.key); | |
331744e3 | 3324 | |
75d83e50 | 3325 | pthread_mutex_lock(&ctx->metadata_socket_lock); |
9ce5646a MD |
3326 | |
3327 | health_code_update(); | |
3328 | ||
331744e3 JD |
3329 | ret = lttcomm_send_unix_sock(ctx->consumer_metadata_socket, &request, |
3330 | sizeof(request)); | |
3331 | if (ret < 0) { | |
3332 | ERR("Asking metadata to sessiond"); | |
3333 | goto end; | |
3334 | } | |
3335 | ||
9ce5646a MD |
3336 | health_code_update(); |
3337 | ||
331744e3 JD |
3338 | /* Receive the metadata from sessiond */ |
3339 | ret = lttcomm_recv_unix_sock(ctx->consumer_metadata_socket, &msg, | |
3340 | sizeof(msg)); | |
3341 | if (ret != sizeof(msg)) { | |
8fd623e0 | 3342 | DBG("Consumer received unexpected message size %d (expects %zu)", |
331744e3 JD |
3343 | ret, sizeof(msg)); |
3344 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); | |
3345 | /* | |
3346 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
3347 | * since the caller handles this. | |
3348 | */ | |
3349 | goto end; | |
3350 | } | |
3351 | ||
9ce5646a MD |
3352 | health_code_update(); |
3353 | ||
331744e3 JD |
3354 | if (msg.cmd_type == LTTNG_ERR_UND) { |
3355 | /* No registry found */ | |
3356 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, | |
3357 | ret_code); | |
3358 | ret = 0; | |
3359 | goto end; | |
3360 | } else if (msg.cmd_type != LTTNG_CONSUMER_PUSH_METADATA) { | |
3361 | ERR("Unexpected cmd_type received %d", msg.cmd_type); | |
3362 | ret = -1; | |
3363 | goto end; | |
3364 | } | |
3365 | ||
3366 | len = msg.u.push_metadata.len; | |
3367 | key = msg.u.push_metadata.key; | |
3368 | offset = msg.u.push_metadata.target_offset; | |
93ec662e | 3369 | version = msg.u.push_metadata.version; |
331744e3 | 3370 | |
a0377dfe | 3371 | LTTNG_ASSERT(key == channel->key); |
331744e3 JD |
3372 | if (len == 0) { |
3373 | DBG("No new metadata to receive for key %" PRIu64, key); | |
3374 | } | |
3375 | ||
9ce5646a MD |
3376 | health_code_update(); |
3377 | ||
331744e3 JD |
3378 | /* Tell session daemon we are ready to receive the metadata. */ |
3379 | ret = consumer_send_status_msg(ctx->consumer_metadata_socket, | |
0c759fc9 | 3380 | LTTCOMM_CONSUMERD_SUCCESS); |
331744e3 JD |
3381 | if (ret < 0 || len == 0) { |
3382 | /* | |
3383 | * Somehow, the session daemon is not responding anymore or there is | |
3384 | * nothing to receive. | |
3385 | */ | |
3386 | goto end; | |
3387 | } | |
3388 | ||
9ce5646a MD |
3389 | health_code_update(); |
3390 | ||
1eb682be | 3391 | ret = lttng_ustconsumer_recv_metadata(ctx->consumer_metadata_socket, |
93ec662e | 3392 | key, offset, len, version, channel, timer, wait); |
1eb682be | 3393 | if (ret >= 0) { |
f2a444f1 DG |
3394 | /* |
3395 | * Only send the status msg if the sessiond is alive meaning a positive | |
3396 | * ret code. | |
3397 | */ | |
1eb682be | 3398 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, ret); |
f2a444f1 | 3399 | } |
331744e3 JD |
3400 | ret = 0; |
3401 | ||
3402 | end: | |
9ce5646a MD |
3403 | health_code_update(); |
3404 | ||
75d83e50 | 3405 | pthread_mutex_unlock(&ctx->metadata_socket_lock); |
331744e3 JD |
3406 | return ret; |
3407 | } | |
70190e1c DG |
3408 | |
3409 | /* | |
3410 | * Return the ustctl call for the get stream id. | |
3411 | */ | |
3412 | int lttng_ustconsumer_get_stream_id(struct lttng_consumer_stream *stream, | |
3413 | uint64_t *stream_id) | |
3414 | { | |
a0377dfe FD |
3415 | LTTNG_ASSERT(stream); |
3416 | LTTNG_ASSERT(stream_id); | |
70190e1c | 3417 | |
b623cb6a | 3418 | return lttng_ust_ctl_get_stream_id(stream->ustream, stream_id); |
70190e1c | 3419 | } |
881fc67f MD |
3420 | |
3421 | void lttng_ustconsumer_sigbus_handle(void *addr) | |
3422 | { | |
3423 | lttng_ust_ctl_sigbus_handle(addr); | |
3424 | } |